ZGO-04-02-005 Co-BCCH Feature Guide ZXG10-iBSC (V12.3.0)20131014

ZGO-04-02-005 Co-BCCH

Feature Guide


ZTE Confidential Proprietary 1


Version Date Author Reviewer Notes

V1.0 2013/04/10 Xu Xiaodan

GU Commercial

System Supporting

Dept.

First release

© 2014 ZTE Corporation. All rights reserved.

ZTE CONFIDENTIAL: This document contains proprietary information of ZTE and is not to be disclosed or used

without the prior written permission of ZTE.

Due to update and improvement of ZTE products and technologies, information in this document is subjected to

change without notice.


2 ZTE Confidential Proprietary

TABLE OF CONTENTS

1 Feature Attribute ............................................................................................... 8

2 Overview ............................................................................................................ 8

2.1 Feature Introduction ............................................................................................. 8

2.2 License Control .................................................................................................. 10

2.3 Correlation with Other Features ......................................................................... 10

3 Technical Description ..................................................................................... 11

3.1 Concept of Sub-Cell ........................................................................................... 11

3.2 Co-BCCH Assignment Algorithm ....................................................................... 12

3.3 Co-BCCH Handover Algorithm ........................................................................... 13

3.3.1 Intra-Cell Handover Algorithm ............................................................................ 13

3.3.2 Inter-Cell Handover Algorithm ............................................................................ 15

3.4 Load Balance Algorithm ..................................................................................... 17

3.4.1 Process of Assignment ...................................................................................... 17

3.4.2 Process of Inter-Subcell Handover ..................................................................... 18

3.4.3 Process of Intra-Subcell Handover ..................................................................... 20

3.5 CoBCCH PS Subcell Access ............................................................................. 20

3.5.1 Process of Assignment When 900M Is Preferred ............................................... 20

3.5.2 Process of Assignment When 1800M Is Preferred ............................................. 20

3.6 CoBCCH PS Inter-Subcell Adjustment ............................................................... 21

3.6.1 Process of Adjustment When 900M Is Preferred ................................................ 21

3.6.2 Process of Adjustment When 1800M Is Preferred .............................................. 22

3.6.3 Process of Load Balance ................................................................................... 23

4 Parameters and Configurations ..................................................................... 23

4.1 Parameter List ................................................................................................... 23

4.2 Parameter Configuration .................................................................................... 25

4.2.1 SubCell ID.......................................................................................................... 25

4.2.2 Frequency Band of SubCell ............................................................................... 25

4.2.3 PBGT handover start threshold of subcell2 ........................................................ 26

4.2.4 Load Threshold of HO from AMR FR to AMR HR (V3) in subcell2 ..................... 27

4.2.5 Load Threshold of HO from FR to HR (V1) in subcell2 ....................................... 28

4.2.6 Subcell handover algorithm (HighSpeed) ........................................................... 28

4.2.7 Subcell handover algorithm (MilddleSpeed) ....................................................... 29

4.2.8 Subcell handover algorithm (LowSpeed) ............................................................ 30

4.2.9 The MAX of path loss ......................................................................................... 30

4.2.10 The MIN of path loss .......................................................................................... 31

4.2.11 The MAX of time advance .................................................................................. 32



4.2.12 The MIN of time advance ................................................................................... 32

4.2.13 Handover Parameter N of SubCell1 ................................................................... 33

4.2.14 Handover Parameter P of SubCell1 ................................................................... 34

4.2.15 Handover Parameter N of SubCell2 ................................................................... 35

4.2.16 Handover Parameter P of SubCell2 ................................................................... 35

4.2.17 Inter Site handover to SubCell2 permitted .......................................................... 36

4.2.18 Measure BCCH when in subcell2 ....................................................................... 37

4.2.19 SubCell selection of PS channel allocation ........................................................ 37

4.2.20 RXLEV threshold in SubCell1 ............................................................................ 38

4.2.21 RXLEV threshold in SubCell2 ............................................................................ 39

4.2.22 RxLev P Value ................................................................................................... 40

4.2.23 RxLev N Value ................................................................................................... 41

4.2.24 TA threshold for PS channel allocate in SubCell1 .............................................. 42

4.2.25 TA threshold for PS channel allocate in SubCell2 .............................................. 42

4.2.26 TA P Value......................................................................................................... 43

4.2.27 TA N Value ........................................................................................................ 44

4.2.28 SubCell1 PS Busy Threshold ............................................................................. 44

4.2.29 SubCell2 PS Busy Threshold ............................................................................. 45

4.2.30 First Measurement Report Allowed to be Used by CoBCCH .............................. 46

4.2.31 Use Load Balance .............................................................................................. 47

4.2.32 Subcell1 Handover in Load Threshold ............................................................... 47

4.2.33 Subcell1 Handover out Load Threshold ............................................................. 48

4.2.34 Subcell1 High Load Threshold ........................................................................... 49

4.2.35 Subcell2 Handover in Load Threshold ............................................................... 51

4.2.36 Subcell2 Handover out Load Threshold ............................................................. 52

4.2.37 Subcell2 High Load Threshold ........................................................................... 52

4.2.38 Assignment Path Loss MAX ............................................................................... 54

4.2.39 Assignment Path Loss MIN ................................................................................ 55

4.2.40 Assignment TA MAX .......................................................................................... 55

4.2.41 Assignment TA MIN ........................................................................................... 56

4.2.42 Assignment Good C/I Threshold ........................................................................ 57

4.2.43 Assignment Bad C/I Threshold ........................................................................... 57

4.2.44 Inter-Subcell Handover Failure Penalty Time ..................................................... 58

4.2.45 Whether to Execute Subcell Penalty after Reassignment ................................... 59

4.2.46 Subcell Preferred for Allocation .......................................................................... 59

4.2.47 CoBCCH Assignment ........................................................................................ 60

4.2.48 MIN PBGT Handover Threshold of Subcell2 ...................................................... 61

4.2.49 MIN Strength Handover Threshold of Subcell2 .................................................. 62

4.2.50 MIN Quality Handover Threshold of Subcell2 ..................................................... 62

4.2.51 MIN RxLev of Subcell2’s Adjacent Cell .............................................................. 63

4.2.52 Traffic Threshold of the Target Cell for Subcell2 to Handover ............................ 64

4.2.53 Level Threshold of the Inter-Subcell Handover .................................................. 64



4.2.54 Load Threshold of Handover from HR (V1) to FR in Subcell2 ............................ 65

4.2.55 Load Threshold of Handover from HR (V3) to FR in Subcell2 ............................ 66

4.2.56 Time of Waiting for MR when CoBCCH Assignment .......................................... 67

4.2.57 Initial CoBCCH Access According to Preferred Frequency Band ....................... 67

4.2.58 Subcell1 High Threshold .................................................................................... 68

4.2.59 Subcell2 High Threshold .................................................................................... 69

4.2.60 Subcell1 Handover in Threshold ........................................................................ 70

4.2.61 Subcell2 Handover in Threshold ........................................................................ 70

4.2.62 Subcell Load Balance ........................................................................................ 71

5 Related Counters and Alarms ........................................................................ 72

5.1 Related Counters ............................................................................................... 72

5.2 Related Alarms .................................................................................................. 80

6 Engineering Guide .......................................................................................... 80

6.1 Application Scenario .......................................................................................... 80

6.2 Configuration Description ................................................................................... 80

6.3 Feature Validation .............................................................................................. 85

6.3.1 Basic Service ..................................................................................................... 85

6.3.2 CoBCCH Intra-Cell Handover due to TA and Path Loss..................................... 86

6.3.3 Handover between CoBCCH Cell and Other Cells, Co-site (GSM900) .............. 87

6.3.4 Handover between CoBCCH Cell and Other Cells, Co-site (DCS1800) ............. 88

6.3.5 Handover between two CoBCCH Cells, Co-site ................................................. 89

6.3.6 PS Service on CoBCCH Cell ............................................................................. 89

6.3.7 CS Load Balance in CoBCCH Cell ..................................................................... 90

6.3.8 PS Load Balance in CoBCCH Cell ..................................................................... 92

6.3.9 Distinction between CoBCCH Assignment and Handover Parameters, Subcell

Penalty Optimization .......................................................................................... 93

6.3.10 The Number of Idle Channels Is Valid to Both CoBCCH Subcells ...................... 94

6.4 Feature Turn off ................................................................................................. 95

6.5 Network Impact .................................................................................................. 96

7 Abbreviation .................................................................................................... 97

8 Reference Document ....................................................................................... 97



FIGURES

Figure 2-1 Dual-Band Network Not Adopting Co-BCCH ...................................................... 9

Figure 2-2 Dual-Band Network Adopting CoBCCH ............................................................10

Figure 3-1 Co-Site Dual-Band ............................................................................................11

Figure 6-1 Cell Creation Interface ......................................................................................80

Figure 6-2 Sub-Cell Creation Interface 1 ............................................................................81

Figure 6-3 Sub-Cell Creation Interface 2 ............................................................................81

Figure 6-4 Sub-Cell TRX Creation Interface .......................................................................82

Figure 6-5 Sub-Cell Handover Parameter Interface 1 ........................................................83

Figure 6-6 Sub-Cell Handover Parameter Interface 2 ........................................................83

Figure 6-7 Sub-Cell PS Channel Allocation Configuration Interface ...................................84

Figure 6-8 Sub-Cell PS Channel Allocation Control Interface .............................................85

TABLES

Table 4-1 Parameter List ...................................................................................................23

Table 4-2 SubCell ID ..........................................................................................................25

Table 4-3 Frequency Band of SubCell ...............................................................................25

Table 4-4 PBGT handover start threshold of subcell2 ........................................................26

Table 4-5 Load Threshold of HO from AMR FR to AMR HR (V3) in subcell2 .....................27

Table 4-6 Load Threshold of HO from FR to HR (V1) in subcell2 .......................................28

Table 4-7 Subcell handover algorithm (HighSpeed) ...........................................................28

Table 4-8 Subcell handover algorithm (MilddleSpeed) .......................................................29

Table 4-9 Subcell handover algorithm (LowSpeed) ............................................................30

Table 4-10 The MAX of path loss .......................................................................................30

Table 4-11 The MIN of path loss ........................................................................................31

Table 4-12 The MAX of time advance ................................................................................32



Table 4-13 The MIN of time advance .................................................................................32

Table 4-14 Handover Parameter N of SubCell1 .................................................................33

Table 4-15 Handover Parameter P of SubCell1 .................................................................34

Table 4-16 Handover Parameter N of SubCell2 .................................................................35

Table 4-17 Handover Parameter P of SubCell2 .................................................................35

Table 4-18 Inter Site handover to SubCell2 permitted ........................................................36

Table 4-19 Measure BCCH when in subcell2 .....................................................................37

Table 4-20 SubCell selection of PS channel allocation ......................................................37

Table 4-21 RXLEV threshold in SubCell1 ..........................................................................38

Table 4-22 RXLEV threshold in SubCell2 ..........................................................................39

Table 4-23 RxLev P Value .................................................................................................40

Table 4-24 RxLev N Value .................................................................................................41

Table 4-25 TA threshold for PS channel allocate in SubCell1 ............................................42

Table 4-26 TA threshold for PS channel allocate in SubCell2 ............................................42

Table 4-27 TA P Value .......................................................................................................43

Table 4-28 TA N Value ......................................................................................................44

Table 4-29 SubCell1 PS Busy Threshold ...........................................................................44

Table 4-30 SubCell2 PS Busy Threshold ...........................................................................45

Table 4-31 First Measurement Report Allowed to be Used by CoBCCH ............................46

Table 4-32 Use Load Balance ............................................................................................47

Table 4-33 Subcell1 Handover in Load Threshold .............................................................47

Table 4-34 Subcell1 Handover out Load Threshold ...........................................................48

Table 4-35 Subcell1 High Load Threshold .........................................................................49

Table 4-36 Subcell2 Handover in Load Threshold .............................................................51

Table 4-37 Subcell2 Handover out Load Threshold ...........................................................52

Table 4-38 Subcell2 High Load Threshold .........................................................................52

Table 4-39 Assignment Path Loss MAX .............................................................................54

Table 4-40 Assignment Path Loss MIN ..............................................................................55

Table 4-41 Assignment TA MAX ........................................................................................55

Table 4-42 Assignment TA MIN .........................................................................................56



Table 4-43 Assignment Good C/I Threshold ......................................................................57

Table 4-44 Assignment Bad C/I Threshold .........................................................................57

Table 4-45 Inter-Subcell Handover Failure Penalty Time ...................................................58

Table 4-46 Whether to Execute Subcell Penalty after Reassignment .................................59

Table 4-47 Subcell Preferred for Allocation ........................................................................59

Table 4-48 CoBCCH Assignment.......................................................................................60

Table 4-49 MIN PBGT Handover Threshold of Subcell2 ....................................................61

Table 4-50 MIN Strength Handover Threshold of Subcell2 ................................................62

Table 4-51 MIN Quality Handover Threshold of Subcell2 ...................................................62

Table 4-52 MIN RxLev of Subcell2’s Adjacent Cell ............................................................63

Table 4-53 Traffic Threshold of the Target Cell for Subcell2 to Handover ..........................64

Table 4-54 Level Threshold of the Inter-Subcell Handover.................................................64

Table 4-55 Load Threshold of Handover from HR (V1) to FR in Subcell2 ..........................65

Table 4-56 Load Threshold of Handover from HR (V1) to FR in Subcell2 ..........................66

Table 4-57 Time of Waiting for MR when CoBCCH Assignment ........................................67

Table 4-58 Initial CoBCCH Access According to Preferred Frequency Band .....................67

Table 4-59 Subcell1 High Threshold ..................................................................................68

Table 4-60 Subcell2 High Threshold ..................................................................................69

Table 4-61 Subcell1 Handover in Threshold ......................................................................70

Table 4-62 Subcell2 Handover in Threshold ......................................................................70

Table 4-63 Subcell Load Balance ......................................................................................71

Table 5-1 Counters list .......................................................................................................72



1 Feature Attribute

BSC Version: [ZXG10-iBSC GSM (V6.30.103)]

BTS Version: [SDRV4.12.10.15]

Property: [Optional]

Related Network Element:

NE Name Related or Not Special Requirements

MS -

BTS √

BSC √

iTC -

MSC √

MGW -

SGSN -

GGSN -

HLR -

Dependent Function: [None]

Exclusive Function: [None]

Note: [None]

2 Overview

2.1 Feature Introduction

The Co-BCCH technology means that carriers of different frequency bands (any two

bands of 900/1800/850/1900MHz) are configured in a cell, sharing a BCCH in one of the

two frequency bands.



For example, in a 900/1800MHz dual-band cell, BCCH is configured at the 900MHz

carrier, and non-BCCH can be configured either at the 900MHz carrier or at the

1800MHz.

The Co-BCCH networking enjoys the following advantages:

Increasing the capacity: Since BCCH is released, the internal circle and the external

circle share SDCCH and PDCH, thus the number of TCHs is increased.

Improving the network quality: the number of 1800 MHz BCCHs is decreased, so the

interference of the corresponding 1800 MHz BCCH is reduced.

Easy maintenance: For the dual-band network, the Co-BCCH technology reduces the

number of cells.

To perform capacity expansion for the original 900MHz network, configure the 1800MHz

carrier in the 900MHz cell, and the adjacent cell relationship does not need to be

modified. Therefore, the network re-planning is not required, and problems, such as

reselection and handover of co-site dual-band cells, need not to be considered, as shown

below.

Figure 2-1 Dual-Band Network Not Adopting Co-BCCH

900M

1800M

Frequent inter-cell handover, reselection



Figure 2-2 Dual-Band Network Adopting CoBCCH

900M

1800M

Only intra-cell handover occurs

2.2 License Control

None license control for this feature in UR12 Release.

2.3 Correlation with Other Features

This feature has correlation with the following features:

ZGO-05-02-009 Concentric Circle Technology

ZGO-05-02-010 Multi-band Networking

The following describes the correlation in detail:

1. The correlation between this feature and the concentric circle technology is: The

two represent different application scenarios of the sub-cell technology; while

Co-BCCH is the logical expression of sub-cell technology’s implementation.

The concentric circle technology is applied in the co-frequency network. The two

sub-cells have the same frequency band, power control is enabled respectively in

each sub-cell, which implements the enhanced concentric circle technology. The

algorithms include: Handover between sub-cells is based on path loss and TA and

handover between sub-cells is based on C/I. If the coverage radius decreases due

to multiple bypass combiners because of sites with large configuration, sub-cell

handover algorithm should be based on path loss and TA, in this case, the circle

outside guarantees coverage. If the interference in the internal circle is small, to



improve the call quality and the frequency usage, sub-cell handover algorithm

should be based on C/I.

The Co-BCCH technology is applied in the dual-band network. Carriers of two

different bands are configured in the same cell, sharing BCCH of one of the two

bands. The first sub-cell is configured with BCCH and the second subcell is a newly

added sub-cell. Sub-cell handover algorithm is based on path loss and TA.

The correlation between this feature and the dual-band networking is: If the dual-band

network adopts the dual-band co-cell configuration, this feature should be considered.

3 Technical Description

3.1 Concept of Sub-Cell

In ZXUR 9000 system, the CoBCCH technology is implemented through subcells, as

shown in Figure 3-1.

Figure 3-1 Co-Site Dual-Band

Site

Subcell 1 900M

Subcell 2 1800M

The sub-cell is defined as following: Carriers in a cell is divided into two parts, belonging

to two sub-cells. The first sub-cell is configured with BCCH, and the second sub-cell is

configured with non-BCCH. For a 900/1800 MHz dual-band network, BCCH and SDCCH



are often configured at 900 MHz carriers, which have the larger coverage area. Thus the

first sub-cell is configured as 900 MHz and the second sub-cell is configured as

1800MHz. Generally, the channels in subcell1 are so rare resources that the channels in

subcell2 are strongly suggested to be allocated as long as the radio condition allows.

This is the first COBCCH channel allocation policy. Later on, policies concerned with the

preferred subcell1 and load balance were added.

3.2 Co-BCCH Assignment Algorithm

In COBCCH scenarios, it is not possible to learn whether the MS is covered by subcell2 if

no measurement reports are received when assigning. As a result, the MS is directly

assigned to subcell1. If the measurement reports are received, refer to these reports to

decide whether to assign the MS directly to subcell2.

How to decide the assignment: When the path loss/TA meet the threshold of assignment

to subcell2 (AssPathLossMin/AssSubCellTAMin), channels of the subcell2 are allocated

with priority. When Cobcchassbyonemr (It is allowed to refer to the first measurement

report when making CoBcch assignment) is “0”, two pieces of measurement reports

should be judged. When Cobcchassbyonemr is “1”, only one piece of measurement

report should be judged.

When the authentication, encryption and so on are not enabled, measurement reports

are usually not received before receiving the assignment message. This increases the

possibility of assigning to subcell1, which increases the traffic load of subcell1. To handle

this problem, a counter “Time of Waiting for MR when CoBCCH Assignment” is used to

control whether to wait for a while before assigning in order to get the measurement

reports. This counter increases the possibility of assigning to subcell2. If the counter is

set to “0”, it indicates “Do not wait”.

Considering that the success rate of assigning to subcell2 is sometimes not good enough,

assignment can be made in subcell1 only, which is controlled by the parameter

SubCellAssign.

With the reassignment enabled, to avoid the immediate handover to the subcell which

just encounters assignment failure, there is an inter-subcell penalty. If it is still within the

penalty time, no inter-subcell handover decision is made.



For the initial PS access in a CoBCCH scenario, when the measurement conditions are

not sufficient, it will first be assigned to subcell1 to guarantee the access success rate.

When there is packet reassignment, whether to reassign it to subcell2 depends on the

measurement result and load.

3.3 Co-BCCH Handover Algorithm

3.3.1 Intra-Cell Handover Algorithm

The CoBCCH inter-subcell handover algorithm is based on the path loss and TA, and

subcell2 is preferred (CSAllocSC is set to “0”).

When the call is in subcell1, the small path loss/TA indicates a short distance to the BS.

Hand over the call to subcell2 to absorb some traffic. When the call is in subcell2, the big

path loss/TA indicates a long distance to the BS. Hand over the call to subcell1 to avoid

call drop due to radio link failure.

1) Path loss and TA are too small

If the path loss and TA are small, handover will be triggered if the following conditions are

all satisfied.

If the call is in subcell1,

1. P out of consecutive N TA value is smaller than or equals to the threshold

SubCellTAMin defined by the cell parameter;

2. P out of consecutive N path loss calculated according to the downlink level is smaller

than or equals to the threshold PathLossMin defined by the cell parameter;

3. The MS supports the frequency band of subcell2.

Handover is performed to make the call move to subcell2.

Formula (1) and (2) are used in the handover decision:



in PathLossM(n) PathLoss

(1)

inSubCellTAM TA(n)

(2)

In formula (1), PathLoss is the path loss; PathLossMin is the threshold of path loss in

handover from subcell1 to subcell2. In formula (2), TA(n) is the current TA value,

SubCellTAMin is the threshold of TA in handover from subcell1 to subcell2.

If P out of the consecutive N PathLoss values and TA values satisfy formula (1) and (2),

handover is performed to make the call move from subcell1 to subcell2.

2) Path loss and TA are too large

If the path loss and TA are large, handover will be triggered if the following conditions are

all satisfied.

The call is in subcell2.

P out of consecutive N TA value is larger than or equals to the threshold

SubCellTAMax defined by the cell parameter.

P out of consecutive N path loss calculated according to the downlink level is larger

than or equals to the threshold PathLossMax defined by the cell parameter.

Handover is performed to make the call move to subcell1.

Formula (3) and (4) are used in the handover decision:

ax PathLossM(n) PathLoss

(3)

axSubCellTAM TA(n)

(4)



In formula (3), PathLossMax is the threshold of path loss in handover from subcell2 to

subcell1. In formula (4), SubCellTAMax is the threshold of TA in handover from subcell2

to subcell1.

If P out of the consecutive N PathLoss values and TA values satisfy formula (3) and (4),

handover is performed to make the call move from subcell2 to subcell1.

With the BCCH measurement enabled (Subcell2MeasureBcch is set to “1”) in subcells,

and the MS is in subcell2, making handover from subcell2 to subcell1, the MS will not be

handed over to subcell1 unless the level of subcell1 exceeds the threshold

SubCellHoDLThs to better ensure the handover success rate.

To avoid frequent inter-subcell handover failure, there is penalty to the handover failure.

A separate penalty time “Inter-Subcell Handover Failure Penalty Time” is used.

When the intra-cell HR and FR handover based on load is enabled, if it is a CoBCCH cell,

and the handover is within the subcells, and subcell2 uses the following independent

thresholds,

Load threshold of handover from FR to HR (V3) in subcell2

Load threshold of handover from FR to HR (V1) in subcell2

Load threshold of handover from HR (V1) to FR in subcell2

Load threshold of handover from HR (V3) to FR in subcell2

3.3.2 Inter-Cell Handover Algorithm

3.3.2.1 Inter-Cell Handover Out

The algorithm of inter-cell handover is the same as that of common inter-cell handover.

To flexibly control the handover out from subcell2, some handover parameters are added

especially, which are only used for the inter-cell handover out from subcell2, including:

PBGT Handover Start Threshold of Subcell2



MIN PBGT Handover Threshold of Subcell2

MIN Strength Handover Threshold of Subcell2

MIN Quality Handover Threshold of Subcell2

MIN RxLev of Subcell2’s Adjacent Cell

Traffic Threshold of the Target Cell for Subcell2 to Handover

3.3.2.2 Inter-Cell Handover In

Inter-cell handover in is divided into two conditions:

Co-site

If the adjacent two cells are co-site, the parameter “Inter-subcell handover permitted”

should be referred. If the parameter is No, only subcell1 can be selected. If it is set to

according to radio measurement, measure level in terms of target cell and calculate

whether path loss satisfies the condition to assign subcell2. If the condition is satisfied,

the subcell2 is preferred; if the parameter is set to Yes, check the MS condition in original

cell. If the MS is in subcell1, select subcell1; if the MS in subcell2, set subcell2 to

“preferred”.

Different sites

Generally CO-BCCH is applied in the scenario that the external circle covers wider range;

the internal circle fails continuous coverage. Hence the external handover in has to hand

over to the subcell1, and then decides whether to hand over to subcell2 as per actual

conditions.

In fact, the internal circle has better coverage when cell’s radius is small. In this case, the

inter-cell handover in can directly go into the internal circle, reducing handover times,

improving voice quality and alleviating channels’ congestion of subcell1.

The parameter “Inter Site handover to SubCell2 permitted” decides which handover

method is adopted. If the parameter is 0, the external handover in has to select subcell1.



If it is 1, the subcell2 can be selected; while the handover decision only refers path loss

instead of TA.

3.4 Load Balance Algorithm

With CoBCCH enabled, several parameters are added to provide more flexible channel

allocation algorithms and balance the cell load. CSAllocSC indicates the subcell which is

allocated channels with priority. UseLoadBalanc decides whether to enable the load

balance. The following six load thresholds are for assignment and handover.

SC1HoInLoadThs: Subcell1 Handover in Load Threshold

SC1HoOutLoadThs: Subcell1 Handover out Load Threshold

SC1HighLoadThs: Subcell1 Handover High Load Threshold

SC2HoInLoadThs: Subcell2 Handover in Load Threshold

SC2HoOutLoadThs: Subcell2 Handover out Load Threshold

SC2HighLoadThs: Subcell2 Handover High Load Threshold

3.4.1 Process of Assignment

When SubCellAssign is set to “1”, it indicates channels are assigned in subcell1 only.

The following is the processing when SubCellAssign is set to “0”. UseLoadBalance is

enabled.

When subcell1 is preferred,

If TA/path loss does not meet the criterion of assigning channels in subcell2, assign in

subcell1 only;

Though TA/path loss meets the criterion of assigning channels in subcell2, the load of

subcell1 does not exceed SC1HighLoadThs after an FR channel is occupied in subcell1,

subcell1 is preferred for assigning channels;




subcell1 exceeds SC1HighLoadThs after an FR channel is occupied in subcell1 and in

the meantime the load of subcell2 does not exceed SC2HighLoadThs after an FR

channel is occupied in subcell2, subcell2 is preferred for assigning channels;



the meantime the load of subcell2 exceeds SC2HighLoadThs after an FR channel is

occupied in subcell2, subcell1 is preferred for assigning channels.

When subcell2 is preferred,

If TA/path loss does not meet the criterion of assigning channels in subcell2, assign in

subcell1 only;


subcell2 does not exceed SC2HighLoadThs after an FR channel is occupied in subcell2,

subcell2 is preferred for assigning channels;



the meantime the load of subcell1 does not exceed SC1HighLoadThs after an FR

channel is occupied in subcell1, subcell1 is preferred for assigning channels;



the meantime the load of subcell1 exceeds SC1HighLoadThs after an FR channel is

occupied in subcell1, subcell2 is preferred for assigning channels.

3.4.2 Process of Inter-Subcell Handover

The inter-subcell handover is decided by two factors.

With UseLoadBalance enabled, when applying for/releasing channels in a

subcell-architectured cell, make the following decision:



If the load of subcell1 exceeds SC1HioOutLoadThs and the load of subcell2 does not

exceed SC2HoInLoadThs after an FR channel is occupied in subcell2, hand over the

user of the minimum path loss in subcell1 to subcell2;

If the load of subcell2 exceeds SC2HioOutLoadThs and the load of subcell1 does not

exceed SC1HoInLoadThs after an FR channel is occupied in subcell1, hand over the

user of the maximum path loss in subcell2 to subcell1.

The above handover due to high load does not care whether subcell1 or subcell2 is

preferred.

When subcell1 is preferred: As long as the load of subcell1 does not exceed

SC1HoInLoadThs, the handover from subcell2 to subcell1 will always be triggered,

regardless of the load of subcell2. The user of the maximum path loss in subcell2 will be

handed over to subcell1

When subcell2 is preferred, the low handover of subcell2 does not trigger the handover,

which is triggered by the measurement report.

Handover decision triggered by the measurement report

When making a handover decision:

If subcell1 is preferred, the path loss/TA does not trigger the handover to subcell2. The

handover is triggered by the high load of subcell1 (if subcell1 is preferred, the load

balance should be enabled). The path loss/TA triggers the handover from subcell2 to

subcell1. If UseLoadBalance is enabled, it’s necessary to check that the load of subcell1

after an FR channel is occupied in subcell1 does not exceed SC1HoInLoadThs;

If subcell2 is preferred, the path loss/TA triggers the handover from subcell1 to subcell2.

If UseLoadBalance is enabled, it’s necessary to check that the load of subcell2 after an

FR channel is occupied in subcell2 does not exceed SC2HoInLoadThs.

The path loss/TA also triggers the handover from subcell2 to subcell1. If

UseLoadBalance is enabled, it’s necessary to check that the load of subcell1 after an FR

channel is occupied in subcell1 does not exceed SC1HoInLoadThs.



3.4.3 Process of Intra-Subcell Handover

When direct handover to subcell2 is allowed, decide the load of the subcells. The policy

is the same as that of the assignment.

3.5 CoBCCH PS Subcell Access

3.5.1 Process of Assignment When 900M Is Preferred

The PS assignment indicates the two-step packet UL assignment and the timeslot

reallocation after there is DL.

The default value of CoBPriBandAcc is “0”. Use the initial access to assign subcell1

(including the packet assignment).

When CoBPriBandAcc is set to “1” and in the meantime SubCellLoadBanlance is set to

“1”,

If the load of 900M does not reach SubCell1HighThs, allocate channels in 900M;

If the load of 900M is greater than or equals SubCell1HighThs, and C-Value/TA does not

meet the criterion of allocating 1800M channels (C<byPsDlLevelSc2, or

TA>byTALevelSc2), allocate channels in 900M;

If the load of 900M is greater than or equals SubCell1HighThs, and C-Value/TA meets

the criterion of allocating 1800M channels (C≥byPsDlLevelSc2, or TA≤byTALevelSc2),

and in the meantime the load of 1800M is greater than or equals SubCell2HighThs,

allocate channels in 900M;

If the load of 900M is greater than or equals SubCell1HighThs, and C-Value/TA meets

the criterion of allocating 1800M channels (C≥byPsDlLevelSc2, or TA≤byTALevelSc2),

but the load of 1800M is less than SubCell2HighThs, allocate channels in 1800M.

3.5.2 Process of Assignment When 1800M Is Preferred

The default value of CoBPriBandAcc is “0”. Use the initial access to assign subcell1

(including the packet assignment).



When CoBPriBandAcc is set to “1” and in the meantime SubCellLoadBanlance is set to

“1”,

The C-Value/TA does not meet the criterion of allocating 1800M channels

(C<byPsDlLevelSc2, or TA>byTALevelSc2), allocate channels in 900M;

The C-Value/TA meets the criterion of allocating 1800M channels (C≥byPsDlLevelSc2, or

TA≤byTALevelSc2), and the load of 1800M is less than SubCell2HighThs, allocate

channels in 1800M;


TA≤byTALevelSc2), and in the meantime the load of 1800M is greater than or equals

SubCell2HighThs, but the load of 900M is less than SubCell1HighThs, allocate channels

in 900M;


TA≤byTALevelSc2), and the load of 1800M is greater than or equals SubCell2HighThs,

and in the meantime the load of 900M is greater than or equals SubCell1HighThs,

allocate channels in 1800M.

3.6 CoBCCH PS Inter-Subcell Adjustment

3.6.1 Process of Adjustment When 900M Is Preferred

When the system is processing the measurement reports, it will not initiate the resource

adjustment if the user is in subcell1.

If the user is in subcell2: When the level/TA is in subcell1 (C<byPsDlLevelSc1, or

TA>byTALevelSc1), only subcell1 is allowed to initiate the resource adjustment; no other

resource adjustment will be initiated.

After the resource adjustment request from the preferred subcell1 is received, the load of

subcells is got. When the channels occupied in subcell1 are greater than or equal

SubCell1InThs and the channels occupied in subcell2 are less than SubCell2InThs,

channels of subcell2 are requested for allocation;



When the channels occupied in subcell1 are less than SubCell1InThs, channels of

subcell1 are requested for allocation;

When the channels occupied in subcell1 are greater than or equal SubCell1InThs and

the channels occupied in subcell2 are greater than or equal SubCell2InThs, channels of


When only subcell1 is allowed to initiate the resource adjustment, only the channels of

subcell1 are requested for allocation.

3.6.2 Process of Adjustment When 1800M Is Preferred

When the system is processing the measurement reports, the user can be in subcell1 at

anytime.

When the user is in 1800M:

When the level/TA does not meet the criterion of subcell2 (C<byPsDlLevelSc2, or

TA>byTALevelSc2), the resource adjustment is not initiated;

When the level/TA is in subcell1 (C<byPsDlLevelSc1, or TA>byTALevelSc1), only

subcell1 is allowed to initiate the resource adjustment.

When the user is in 900M:

When the level/TA meets the criterion of subcell2 (C≥byPsDlLevelSc2, or

TA≤byTALevelSc2), the resource adjustment of the preferred subcell2 is initiated; no

other resource adjustment will be initiated;

After the resource adjustment request from the preferred subcell2 is received, when the

channels occupied in subcell2 are greater than or equal SubCell2InThs and the channels

occupied in subcell1 are less than SubCell1InThs, channels of subcell1 are requested for

allocation;

When the channels occupied in subcell2 are less than SubCell2InThs, channels of




When the channels occupied in subcell2 are greater than or equal SubCell2InThs and

the channels occupied in subcell1 are greater than or equal SubCell1InThs, channels of


When only subcell1 is allowed to initiate the resource adjustment, only the channels of

subcell1 are requested for allocation.

3.6.3 Process of Load Balance

The system calculates the load of subcell1 and subcell2 in real time.

When the load of subcell1 is greater than or equals SubCell1PsChanThs and in the

meantime the load of subcell2 is less than SubCell2InThs, move the service of the best

level from subcell1 to subcell2;

When the load of subcell2 is greater than or equals SubCell2PsChanThs and in the

meantime the load of subcell1 is less than SubCell1InThs, move the service of the worst

level from subcell2 to subcell1;

To avoid Ping-pong adjustment, the three adjustment requests due to radio reasons

following the adjustment triggered by load will be forbidden.

4 Parameters and Configurations

4.1 Parameter List

Table 4-1 Parameter List

SN Name Figure

1 SubCell ID Figure 6-3

2 Frequency Band of SubCell Figure 6-3

3 PBGT handover start threshold of subcell2 Figure 6-5

4 The load of HO from AMR FR to AMR HR in

subcell2(%) Figure 6-5

5 The load of HO from FR to HR(V1) in subcell2(%) Figure 6-5



6 Subcell handover algorithm(HighSpeed) Figure 6-5

7 Subcell handover algorithm(MilddleSpeed) Figure 6-5

8 Subcell handover algorithm(LowSpeed) Figure 6-5

9 The MAX of path loss Figure 6-5

10 The MIN of path loss Figure 6-5

11 The MAX of time advance Figure 6-5

12 The MIN of time advance Figure 6-5

13 Handover Parameter N of SubCell1 Figure 6-6

14 Handover Parameter P of SubCell1 Figure 6-6

15 Inter Site handover to SubCell2 permitted Figure 6-5

16 Measure BCCH when in subcell2 Figure 6-5

17 SubCell selection of PS channel allocation Figure 6-7

18 RXLEV threshold in SubCell1 Figure 6-7

19 RXLEV threshold in SubCell2 Figure 6-7

20 RxLev P Value Figure 6-7

21 RxLev N Value Figure 6-7

22 TA threshold for PS channel allocate in SubCell1 Figure 6-7

23 TA threshold for PS channel allocate in SubCell2 Figure 6-7

24 TA P Value Figure 6-7

25 TA N Value Figure 6-7

26 SubCell1 PS Busy Threshold Figure 6-7

27 SubCell2 PS Busy Threshold Figure 6-7

28 Handover Parameter N of SubCell2 Figure 6-6

29 Handover Parameter P of SubCell2 Figure 6-6

30 SubCell2 To SubCell1 Handover Threshold Figure 6-6

31 Traffic Threshold of Handover in SubCell1 Figure 6-6

32 Traffic Threshold of Handover out SubCell1 Figure 6-6

33 Measure Bcch When in Subcell2 Figure 6-5

34 SubCell Channel Allocation Control Figure 6-8



4.2 Parameter Configuration

4.2.1 SubCell ID

Table 4-2 SubCell ID

Full name SubCell ID

Abbreviation SubCellId

3GPP Name -

3GPP

Reference -

Description

If it is a dual-frequency co-site cell, this parameter describes to

which subcell the transceiver belongs. If it is not a dual-frequency

co-site cell, the value of this field is “subcell1”, which can no longer

be modified once is established.

When CoBCCH is enabled, select according to actual conditions.

Managed object SubCell

Value range “1”: Subcell1

“2”: Subcell2

Unit -

Default value -

Related Feature ZGO-05-02-009 Concentric Circle Technology


Related

Parameter -

Related

Interface -

4.2.2 Frequency Band of SubCell

Table 4-3 Frequency Band of SubCell

Full name Frequency Band of SubCell

Abbreviation SubFreqBand



3GPP Name -

3GPP

Reference -

Description When CoBCCH is enabled, select according to actual conditions.

Usually subcell1 selects 900M while subcell2 selects 1800M.

Managed object SubCell

Value range

When the parameter Support DCS1800/PCS1900 (FuncExt) is set

to “DCS1800”, the value range is GSM900, EXT900, DCS1800

and GSM850.

Unit -

Default value GSM900M



Related

Parameter -

Related

Interface -

4.2.3 PBGT handover start threshold of subcell2

Table 4-4 PBGT handover start threshold of subcell2

Full name PBGT handover start threshold of subcell2

Abbreviation PbgtHoStartThsSC2

3GPP Name -

3GPP

Reference -

Description

This parameter indicates the PBGT handover start threshold of

subcell2.


Managed object Subcell handover control

Value range 0-63

Unit dB

Default value 35





Related

Parameter -

Related

Interface -

4.2.4 Load Threshold of HO from AMR FR to AMR HR (V3) in subcell2

Table 4-5 Load Threshold of HO from AMR FR to AMR HR (V3) in subcell2

Full name Load Threshold of HO from AMR FR to AMR HR (V3) in subcell2

Abbreviation FrToAmrHrHoLoadThSC2

3GPP Name -

3GPP

Reference -

Description

When the load of the subcell 2 reaches a certain level and AMR

and AHS are being used simultaneously, AMR FR -> AMR HR (V3)

handover needs to be initiated, to obtain more channel resources

and improve the system capacity. This parameter indicates the

load threshold for initiating AMR FR -> AMR HR (V3) handover.



Value range 20-100

Unit %

Default value 80



Related

Parameter -

Related

Interface -



4.2.5 Load Threshold of HO from FR to HR (V1) in subcell2

Table 4-6 Load Threshold of HO from FR to HR (V1) in subcell2

Full name Load Threshold of HO from FR to HR (V1) in subcell2

Abbreviation FrToHrHoLoadThrSC2

3GPP Name -

3GPP

Reference -

Description

When the load of the subcell 2 reaches a certain level, FR -> HR

(V1) handover needs to be initiated, to obtain more channel

resources and improve the system capacity. This parameter

indicates the load threshold for initiating FR -> HR (V1) handover.



Value range 20-100

Unit %

Default value 90



Related

Parameter -

Related

Interface -

4.2.6 Subcell handover algorithm (HighSpeed)

Table 4-7 Subcell handover algorithm (HighSpeed)

Full name Subcell handover algorithm (HighSpeed)

Abbreviation Subcell handover algorithm (HighSpeed)

3GPP Name -

3GPP

Reference -

Description This parameter indicates which subcell handover algorithm to

select in high-speed scenarios.




Value range 0: Handover algorithm based on concentric circle

1: Handover based on path loss and TA

Unit -

Default value 1



Related

Parameter -

Related

Interface -

4.2.7 Subcell handover algorithm (MilddleSpeed)

Table 4-8 Subcell handover algorithm (MilddleSpeed)

Full name Subcell handover algorithm (MilddleSpeed)

Abbreviation Subcell handover algorithm (MilddleSpeed)

3GPP Name -

3GPP

Reference -


select in middle-speed scenarios.




Unit -

Default value 1



Related

Parameter -

Related

Interface -



4.2.8 Subcell handover algorithm (LowSpeed)

Table 4-9 Subcell handover algorithm (LowSpeed)

Full name Subcell handover algorithm (LowSpeed)

Abbreviation Subcell handover algorithm (LowSpeed)

3GPP Name -

3GPP

Reference -


select in low-speed scenarios.




Unit -

Default value 1



Related

Parameter -

Related

Interface -

4.2.9 The MAX of path loss

Table 4-10 The MAX of path loss

Full name The MAX of path loss

Abbreviation PathLossMax

3GPP Name -

3GPP

Reference -

Description

This parameter is one of the subcell handover parameters. It

indicates the threshold for judgment when subcell2 is handed over

to subcell1 based on path loss.





Value range 0-150

Unit dB

Default value 126



Related

Parameter -

Related

Interface -

4.2.10 The MIN of path loss

Table 4-11 The MIN of path loss

Full name The MIN of path loss

Abbreviation PathLossMin

3GPP Name -

3GPP

Reference -

Description

This parameter, one of the subcell handover parameters, indicates

the minimum path loss. If byPath Loss ≤ Path LossMin and TA ≤

SubCellTAMin, the channels of subcell2 are preferred. If byPath

Loss > Path LossMin or TA > SubCellTAMin, only the channels of

subcell1 are selected.



Value range 0-150

Unit dB

Default value 120



Related

Parameter -



Related

Interface -

4.2.11 The MAX of time advance

Table 4-12 The MAX of time advance

Full name The MAX of time advance

Abbreviation SubCellTAMax

3GPP Name -

3GPP

Reference -

Description



to subcell1 based on TA.



Value range 0-63

Unit -

Default value 1



Related

Parameter -

Related

Interface -

4.2.12 The MIN of time advance

Table 4-13 The MIN of time advance

Full name The MIN of time advance

Abbreviation SubCellTAMin

3GPP Name -



3GPP

Reference -

Description



to subcell2 based on TA.



Value range 0-63

Unit -

Default value 0



Related

Parameter -

Related

Interface -

4.2.13 Handover Parameter N of SubCell1

Table 4-14 Handover Parameter N of SubCell1

Full name Handover Parameter N of SubCell1

Abbreviation SubCell1N

3GPP Name -

3GPP

Reference -

Description

This parameter is one of the criteria to decide the subcell1

handover. How to decide: If SubcellP out of the latest SubcellN

sample mean meets the criterion, handover is necessary.


Managed object Subcell Handover Control

Value range 1-10

Unit -

Default value 4





Related

Parameter -

Related

Interface -

4.2.14 Handover Parameter P of SubCell1

Table 4-15 Handover Parameter P of SubCell1

Full name Handover Parameter P of SubCell1

Abbreviation SubCell1P

3GPP Name -

3GPP

Reference -

Description






Value range 1-10

Unit -

Default value 3



Related

Parameter -

Related

Interface -



4.2.15 Handover Parameter N of SubCell2

Table 4-16 Handover Parameter N of SubCell2

Full name Handover Parameter N of SubCell2

Abbreviation SubCell1N

3GPP Name -

3GPP

Reference -

Description






Value range 1-10

Unit -

Default value 4



Related

Parameter -

Related

Interface -

4.2.16 Handover Parameter P of SubCell2

Table 4-17 Handover Parameter P of SubCell2

Full name Handover Parameter P of SubCell2

Abbreviation SubCell1P

3GPP Name -

3GPP

Reference -



Description






Value range 1-10

Unit -

Default value 3



Related

Parameter -

Related

Interface -

4.2.17 Inter Site handover to SubCell2 permitted

Table 4-18 Inter Site handover to SubCell2 permitted

Full name Inter Site handover to SubCell2 permitted

Abbreviation HoToInnerSc

3GPP Name -

3GPP

Reference -

Description

This parameter decides whether it is permitted to perform direct

handover from other sites to subcell2.



Value range 0: Not permitted

1: Permitted

Unit -

Default value 0: Not permitted





Related

Parameter -

Related

Interface -

4.2.18 Measure BCCH when in subcell2

Table 4-19 Measure BCCH when in subcell2

Full name Measure BCCH when in subcell2

Abbreviation SubCell2MeasureBcch

3GPP Name -

3GPP

Reference -

Description

This parameter indicates whether the BCCH measurement feature

is allowed to be enabled in subcell2.



Value range 0: Not permitted

1: Permitted

Unit -

Default value 0: Not permitted



Related

Parameter -

Related

Interface -

4.2.19 SubCell selection of PS channel allocation

Table 4-20 SubCell selection of PS channel allocation

Full name SubCell selection of PS channel allocation

Abbreviation psAllocSc



3GPP Name -

3GPP

Reference -

Description This parameter indicates selecting a subcell for PS service.


Managed object SubCell PS Channel Allocation Configuration

Value range

0: Subcell1 is preferred;

1: Subcell2 is preferred;

2: Subcell1 only.

Unit -

Default value 0: Subcell1 is preferred.



Related

Parameter -

Related

Interface -

4.2.20 RXLEV threshold in SubCell1

Table 4-21 RXLEV threshold in SubCell1

Full name RXLEV threshold in SubCell1

Abbreviation RXLEV threshold in SubCell1

3GPP Name -

3GPP

Reference -

Description

When the PS channel is in subcell2, if the level is smaller than this

parameter, it is necessary to move to subcell1.





Value range

0~63

0: < -110dbm

1: -110 ~ -109

2: -109 ~ -108

…

61: -50 ~ -49

62: -49 ~ -48

63: > -48dbm

Unit -

Default value 20



Related

Parameter -

Related

Interface -

4.2.21 RXLEV threshold in SubCell2

Table 4-22 RXLEV threshold in SubCell2

Full name RXLEV threshold in SubCell2

Abbreviation RXLEV threshold in SubCell2

3GPP Name -

3GPP

Reference -

Description

When the PS channel is in subcell1, if the level is greater than this






Value range

0~63

0: < -110dbm

1: -110 ~ -109

2: -109 ~ -108

…

61: -50 ~ -49

62: -49 ~ -48

63: > -48dbm

Unit -

Default value 40



Related

Parameter -

Related

Interface -

4.2.22 RxLev P Value

Table 4-23 RxLev P Value

Full name RxLev P Value

Abbreviation RxLev P Value

3GPP Name -

3GPP

Reference -

Description

This parameter is one of the criteria to decide the subcell PS

service. How to decide: If RxLev P out of RxLev N sample mean

meets the criterion, it is necessary for the PS service to be in its

corresponding subcell.



Value range 0~31

Unit -

Default value 2





Related

Parameter -

Related

Interface -

4.2.23 RxLev N Value

Table 4-24 RxLev N Value

Full name RxLev N Value

Abbreviation RxLev N Value

3GPP Name -

3GPP

Reference -

Description


service. How to decide: If RxLev P out of RxLev N sample mean

meets the criterion, it is necessary for the PS service to be in its




Value range 0~31

Unit -

Default value 3



Related

Parameter -

Related

Interface -



4.2.24 TA threshold for PS channel allocate in SubCell1

Table 4-25 TA threshold for PS channel allocate in SubCell1

Full name TA threshold for PS channel allocate in SubCell1

Abbreviation TA threshold for PS channel allocate in SubCell1

3GPP Name -

3GPP

Reference -

Description

When the PS channel is in subcell2, if TA is greater than this




Value range 0~63

Unit -

Default value 5



Related

Parameter -

Related

Interface -

4.2.25 TA threshold for PS channel allocate in SubCell2

Table 4-26 TA threshold for PS channel allocate in SubCell2

Full name TA threshold for PS channel allocate in SubCell2

Abbreviation TA threshold for PS channel allocate in SubCell2

3GPP Name -

3GPP

Reference -

Description

When the PS channel is in subcell1, if TA is smaller than this






Value range 0~63

Unit -

Default value 2



Related

Parameter -

Related

Interface -

4.2.26 TA P Value

Table 4-27 TA P Value

Full name TA P Value

Abbreviation TA P Value

3GPP Name -

3GPP

Reference -

Description


service. How to decide: If TA P out of TA N sample mean meets the

criterion, it is necessary for the PS service to be in its




Value range 0~31

Unit -

Default value 2



Related

Parameter -



Related

Interface -

4.2.27 TA N Value

Table 4-28 TA N Value

Full name TA N Value

Abbreviation TA N Value

3GPP Name -

3GPP

Reference -

Description


service. How to decide: If TA P out of TA N sample mean meets the

criterion, it is necessary for the PS service to be in its




Value range 0~31

Unit -

Default value 3



Related

Parameter -

Related

Interface -

4.2.28 SubCell1 PS Busy Threshold

Table 4-29 SubCell1 PS Busy Threshold

Full name SubCell1 PS Busy Threshold

Abbreviation SubCell1 PS Busy Threshold

3GPP Name -



3GPP

Reference -

Description

This parameter indicates the busyness threshold of the PS

channel in subcell1. When the PS channel busyness in subcell1

exceeds this threshold, the PS service prefers subcell2.



Value range 0~100

Unit %

Default value 80



Related

Parameter -

Related

Interface -

4.2.29 SubCell2 PS Busy Threshold

Table 4-30 SubCell2 PS Busy Threshold

Full name SubCell2 PS Busy Threshold

Abbreviation SubCell2 PS Busy Threshold

3GPP Name -

3GPP

Reference -

Description

This parameter indicates the busyness threshold of the PS

channel in subcell2. When the PS channel busyness in subcell2

exceeds this threshold, the PS service prefers subcell1.



Value range 0~100

Unit %

Default value 80





Related

Parameter -

Related

Interface -

4.2.30 First Measurement Report Allowed to be Used by CoBCCH

Table 4-31 First Measurement Report Allowed to be Used by CoBCCH

Full name First Measurement Report Allowed to be Used by CoBCCH

Abbreviation Cobcchassbyonemr

3GPP Name -

3GPP

Reference -

Description

This parameter indicates the call is allowed to be established, and

the system uses the first measurement report.


Managed object GSM logical feature configuration

Value range 0: Disabled

1: Enabled

Unit -

Default value 0



Related

Parameter -

Related

Interface -



4.2.31 Use Load Balance

Table 4-32 Use Load Balance

Full name Use Load Balance

Abbreviation UseLoadBalance

3GPP Name -

3GPP

Reference -

Description

This parameter indicates whether load balance is used between

cells. If load balance is used, the load of the subcell will be

considered, and the inter-cell handover can be triggered by load.


Managed object Subcell handover

Value range 0: Disabled

1: Enabled

Unit -

Default value 0



Related

Parameter

When CSAllocSC is set to “1” (subcell1 is preferred for allocation),

UseLoadBalance must be set to “1”.

Related

Interface -

4.2.32 Subcell1 Handover in Load Threshold

Table 4-33 Subcell1 Handover in Load Threshold

Full name Subcell1 Handover in Load Threshold

Abbreviation SC1HoInLoadThs

3GPP Name -

3GPP

Reference -



Description

This parameter indicates the load threshold of handover in to

subcell1. With load balance enabled between subcells, that is,

UseLoadBalance is set to “1”, the load of subcell1 must not be

greater than this threshold when handover from subcell 2 to

subcell1.


Value range 0-100

Unit %

Default value 50



Related

Parameter -

Related

Interface -

4.2.33 Subcell1 Handover out Load Threshold

Table 4-34 Subcell1 Handover out Load Threshold

Full name Subcell1 Handover out Load Threshold

Abbreviation SC1HoOutLoadThs

3GPP Name -

3GPP

Reference -

Description

This parameter indicates the load threshold of handover out from


UseLoadBalance is set to “1”, and in the meantime the load of

subcell2 does not exceed SC2HoInLoadThs, the user who is in

subcell1 and has the minimum path loss (or has the maximum C/I)

will be handed over to subcell2.


Value range 0-100

Unit %

Default value 85





Related

Parameter -

Related

Interface -

4.2.34 Subcell1 High Load Threshold

Table 4-35 Subcell1 High Load Threshold

Full name Subcell1 High Load Threshold

Abbreviation SC1HighLoadThs

3GPP Name -

3GPP

Reference -



Description

This parameter indicates the high load threshold of subcell1.

If channels are preferred to be allocated in subcell1 when

assigning (that is, SubCellAssign is set to “0” and CSAllocSC is set

to “1”), then:

If TA/path loss (or C/I) does not meet the criterion of allocating

channels in subcell2, channels are allocated in subcell1 only;

If TA/path loss (or C/I) meets the criterion of allocating channels in

subcell2 and in the meantime the load of subcell1 does not exceed

SC1HighLoadThs, channels are preferred to be allocated in

subcell1;


subcell2 and in the meantime the load of subcell1 exceeds

SC1HighLoadThs and the load of subcell2 does not exceed


subcell2;



SC1HighLoadThs and the load of subcell2 exceeds


subcell1.



to “0”), then:






subcell2;





subcell1;





subcell2.


Value range 0-100



Unit %

Default value 70



Related

Parameter -

Related

Interface -

4.2.35 Subcell2 Handover in Load Threshold

Table 4-36 Subcell2 Handover in Load Threshold

Full name Subcell2 Handover in Load Threshold

Abbreviation SC2HoInLoadThs

3GPP Name -

3GPP

Reference -

Description

This parameter indicates the load threshold of handover in to


UseLoadBalance is set to “1”, the load of subcell2 must not be

greater than this threshold when handover from subcell 1 to

subcell2.


Value range 0-100

Unit %

Default value 50



Related

Parameter -

Related

Interface -



4.2.36 Subcell2 Handover out Load Threshold

Table 4-37 Subcell2 Handover out Load Threshold

Full name Subcell2 Handover out Load Threshold

Abbreviation SC2HoOutLoadThs

3GPP Name -

3GPP

Reference -

Description

This parameter indicates the load threshold of handover out from


UseLoadBalance is set to “1”, and in the meantime the load of

subcell2 exceeds SC2HoOutLoadThs and the load of subcell1

does not exceed SC1HoInLoadThs, the user who is in subcell2

and has the maximum path loss (or has the minimum C/I) will be

handed over to subcell1.


Value range 0-100

Unit %

Default value 85



Related

Parameter -

Related

Interface -

4.2.37 Subcell2 High Load Threshold

Table 4-38 Subcell2 High Load Threshold

Full name Subcell2 High Load Threshold

Abbreviation SC2HighLoadThs

3GPP Name -

3GPP

Reference -



Description

This parameter indicates the high load threshold of subcell2.



to “1”), then:






subcell1;





subcell2;





subcell1.



to “0”), then:






subcell2;





subcell1;





subcell2.


Value range 0-100



Unit %

Default value 70



Related

Parameter -

Related

Interface -

4.2.38 Assignment Path Loss MAX

Table 4-39 Assignment Path Loss MAX

Full name Assignment Path Loss MAX

Abbreviation AssPathLossMax

3GPP Name -

3GPP

Reference -

Description

This parameter indicates the maximum path loss when deciding

the subcell for assignment. Currently, only AssPathLossMin is

used for decision, while this parameter is not used.


Value range 0-150

Unit -

Default value 126



Related

Parameter -

Related

Interface -



4.2.39 Assignment Path Loss MIN

Table 4-40 Assignment Path Loss MIN

Full name Assignment Path Loss MIN

Abbreviation AssPathLossMin

3GPP Name -

3GPP

Reference -

Description

This parameter indicates the minimum path loss when deciding the

subcell for assignment. It is independent of the handover decision

threshold and can be set separately.


Value range 0-150

Unit -

Default value 120



Related

Parameter -

Related

Interface -

4.2.40 Assignment TA MAX

Table 4-41 Assignment TA MAX

Full name Assignment TA MAX

Abbreviation AssSubCellTAMax

3GPP Name -

3GPP

Reference -

Description

This parameter indicates the maximum TA when deciding the

subcell for assignment. Currently, only AssSubCellTAMin is used

for decision, while this parameter is not used.




Value range 0-63

Unit -

Default value 63



Related

Parameter -

Related

Interface -

4.2.41 Assignment TA MIN

Table 4-42 Assignment TA MIN

Full name Assignment TA MIN

Abbreviation AssSubCellTAMin

3GPP Name -

3GPP

Reference -

Description

This parameter indicates the minimum TA when deciding the




Value range 0-63

Unit -

Default value 62



Related

Parameter -

Related

Interface -



4.2.42 Assignment Good C/I Threshold

Table 4-43 Assignment Good C/I Threshold

Full name Assignment Good C/I Threshold

Abbreviation AssGoodCiThs

3GPP Name -

3GPP

Reference -

Description

This parameter indicates the good C/I threshold when deciding the




Value range 0-255

Unit -

Default value 133



Related

Parameter -

Related

Interface -

4.2.43 Assignment Bad C/I Threshold

Table 4-44 Assignment Bad C/I Threshold

Full name Assignment Bad C/I Threshold

Abbreviation AssBadCiThs

3GPP Name -

3GPP

Reference -

Description

This parameter indicates the bad C/I threshold when deciding the

subcell for assignment. Currently, only AssGoodCiThs is used for

decision, while this parameter is not used.




Value range 0-255

Unit -

Default value 130



Related

Parameter -

Related

Interface -

4.2.44 Inter-Subcell Handover Failure Penalty Time

Table 4-45 Inter-Subcell Handover Failure Penalty Time

Full name Inter-Subcell Handover Failure Penalty Time

Abbreviation SChoFailPenalTime

3GPP Name -

3GPP

Reference -

Description This parameter indicates the inter-subcell handover failure penalty

time.

Managed object Handover control

Value range 1-255

Unit Measurement Report Time

Default value 14



Related

Parameter -

Related

Interface -



4.2.45 Whether to Execute Subcell Penalty after Reassignment

Table 4-46 Whether to Execute Subcell Penalty after Reassignment

Full name Whether to Execute Subcell Penalty after Reassignment

Abbreviation SCPunishReAssCom

3GPP Name -

3GPP

Reference -

Description This parameter indicates whether to execute the subcell handover

decision penalty after the successful reassignment.

Managed object Type B parameter

Value range 0-1

Unit -

Default value 0



Related

Parameter -

Related

Interface -

4.2.46 Subcell Preferred for Allocation

Table 4-47 Subcell Preferred for Allocation

Full name Subcell Preferred for Allocation

Abbreviation CSAllocSC

3GPP Name -

3GPP

Reference -

Description This parameter controls which subcell is preferred for channel

allocation.

Managed object Cell



Value range 0: Allocation in subcell2 is preferred;

1: Allocation in subcell1 is preferred.

Unit -

Default value 0



Related

Parameter -

Related

Interface -

4.2.47 CoBCCH Assignment

Table 4-48 CoBCCH Assignment

Full name CoBCCH Assignment

Abbreviation SubCellAssign

3GPP Name -

3GPP

Reference -

Description

When CoBCCH is enabled in outfields, it is better to keep the

users in subcell2 since there are usually fewer channels in

subcell1. Users are directly assigned to subcell2 when path

loss/TA meets the criterion. The signal measured on SDCCH of

subcell1 is the current subcell’s signal. Calculate the path loss by

using this signal is sometimes not accurate enough to decide

whether to assign to subcell2. To improve the assignment success

rate, there is another way, to assign in subcell1 only. To assign in

the latter way, there must be adequate channels in subcell1. After

the assignment, move the users who meet the criterion of subcell2

from subcell1 to subcell2 through intra-cell handover. This

parameter decides the way to assign.

Managed object Cell

Value range 0: Assign according to the radio measurement;

1: Assigned to subcell1 only.

Unit -



Default value 0



Related

Parameter -

Related

Interface -

4.2.48 MIN PBGT Handover Threshold of Subcell2

Table 4-49 MIN PBGT Handover Threshold of Subcell2

Full name MIN PBGT Handover Threshold of Subcell2

Abbreviation HoMarginPbgtSC2

3GPP Name -

3GPP

Reference -

Description This parameter indicates the threshold to trigger the handover to

the adjacent cell due to PBGT when the user is in subcell2.

Managed object Adjacent cell

Value range 0-100, indicating -24dB to -76dB respectively

Unit -

Default value 0



Related

Parameter -

Related

Interface -



4.2.49 MIN Strength Handover Threshold of Subcell2

Table 4-50 MIN Strength Handover Threshold of Subcell2

Full name MIN Strength Handover Threshold of Subcell2

Abbreviation HoMarginRxLevSC2

3GPP Name -

3GPP

Reference -


the adjacent cell due to strength when the user is in subcell2.



Unit -

Default value 0



Related

Parameter -

Related

Interface -

4.2.50 MIN Quality Handover Threshold of Subcell2

Table 4-51 MIN Quality Handover Threshold of Subcell2

Full name MIN Quality Handover Threshold of Subcell2

Abbreviation HoMarginRxQualSC2

3GPP Name -

3GPP

Reference -


the adjacent cell due to quality when the user is in subcell2.





Unit -

Default value 0



Related

Parameter -

Related

Interface -

4.2.51 MIN RxLev of Subcell2’s Adjacent Cell

Table 4-52 MIN RxLev of Subcell2’s Adjacent Cell

Full name MIN RxLev of Subcell2’s Adjacent Cell

Abbreviation RxLevMinSC2

3GPP Name -

3GPP

Reference -

Description

This parameter indicates the minimum receiving level (on BCCH)

required for the MS to handover to the current cell when the user is

in subcell2.


Value range

0…63

0: < -110dBm

1: -110 ~ -109dBm

2: -109 ~ -108dBm

…

62: -49 ~ -48dBm

63: > -48dBm

Unit -

Default value 15





Related

Parameter -

Related

Interface -

4.2.52 Traffic Threshold of the Target Cell for Subcell2 to Handover

Table 4-53 Traffic Threshold of the Target Cell for Subcell2 to Handover

Full name Traffic Threshold of the Target Cell for Subcell2 to Handover

Abbreviation TargetTrafficThsSC2

3GPP Name -

3GPP

Reference -

Description This parameter indicates the maximum traffic of the target cell

when the user is in subcell2.


Value range 0…100

Unit -

Default value 75



Related

Parameter -

Related

Interface -

4.2.53 Level Threshold of the Inter-Subcell Handover

Table 4-54 Level Threshold of the Inter-Subcell Handover

Full name Level Threshold of the Inter-Subcell Handover

Abbreviation SubCellHoDLThs

3GPP Name -



3GPP

Reference -

Description

With the BCCH measurement enabled in subcells, this parameter

indicates the level threshold of subcell1 when handover is made

from subcell2 to subcell1. The user will not be handed over to

subcell1 unless the level of subcell1 exceeds this threshold.


Value range

0: < -110dBm

1: -110~-109dBm

2: -109~-108dBm

…

61: -50~-49dBm

62: -49~-48dBm

63: > -48dBm

Unit -

Default value 25



Related

Parameter -

Related

Interface -

4.2.54 Load Threshold of Handover from HR (V1) to FR in Subcell2

Table 4-55 Load Threshold of Handover from HR (V1) to FR in Subcell2

Full name Load Threshold of Handover from HR (V1) to FR in Subcell2

Abbreviation HrToFrHoLoadThrSC2

3GPP Name -

3GPP

Reference -

Description

When the load in subcell2 decreases to a certain degree, initiate

the handover from HR (V1) to FR to improve the speech quality.

This parameter indicates the load threshold of handover from HR

(V1) to FR.




Value range 0…100

Unit %

Default value 30



Related

Parameter -

Related

Interface -

4.2.55 Load Threshold of Handover from HR (V3) to FR in Subcell2

Table 4-56 Load Threshold of Handover from HR (V1) to FR in Subcell2

Full name Load Threshold of Handover from HR (V1) to FR in Subcell2

Abbreviation AmrHrToFrHoLoadThSC2

3GPP Name -

3GPP

Reference -

Description

When the load in subcell2 decreases to a certain degree, initiate

the handover from HR (V3) to FR to improve the speech quality.

This parameter indicates the load threshold of handover from HR

(V3) to FR. When the load is lower than this threshold, handover

from HR (1) to FR has a priority over that from HR (V3) to FR.


Value range 0…100

Unit %

Default value 20



Related

Parameter -



Related

Interface -

4.2.56 Time of Waiting for MR when CoBCCH Assignment

Table 4-57 Time of Waiting for MR when CoBCCH Assignment

Full name Time of Waiting for MR when CoBCCH Assignment

Abbreviation TCobcchWaitMR

3GPP Name -

3GPP

Reference -

Description

There are not enough measurement reports to decide whether

channels can be allocated in subcell2 after the BSC has received

the assignment command from the MSC. Therefore, set this timer

to wait for the measurement reports. If it is set to “0”, it indicates

not waiting for the measurement reports.

Managed object BSS global timer

Value range 0…30

Unit 100ms

Default value 0



Related

Parameter -

Related

Interface -

4.2.57 Initial CoBCCH Access According to Preferred Frequency Band

Table 4-58 Initial CoBCCH Access According to Preferred Frequency Band

Full name Initial CoBCCH Access According to Preferred Frequency Band

Abbreviation CoBPriBandAcc

3GPP Name -



3GPP

Reference -

Description

This parameter indicates whether to follow the priority policy

configured by the network management system when there is

initial access in the CoBCCH cell. When CoBPriBandAcc is set to

“0”, it indicates the default setting that the user initially accesses

subcell1 (900M); When CoBPriBandAcc is set to “1”, it indicates

the user initially accesses according to the priority policy

configured by the network management system, that is, selecting

the preferred band configured by the parameter PSALLOCSC[0].

Managed object Subcell PS channel assignment

Value range 0: No

1: Yes

Unit -

Default value 0



Related

Parameter -

Related

Interface -

4.2.58 Subcell1 High Threshold

Table 4-59 Subcell1 High Threshold

Full name Subcell1 High Threshold

Abbreviation SubCell1HighThs

3GPP Name -

3GPP

Reference -

Description This parameter indicates the threshold of the initial access in

subcell1.


Value range 0-100



Unit %

Default value 70



Related

Parameter -

Related

Interface -

4.2.59 Subcell2 High Threshold

Table 4-60 Subcell2 High Threshold

Full name Subcell1 High Threshold

Abbreviation SubCell2HighThs

3GPP Name -

3GPP

Reference -

Description This parameter indicates the threshold of the initial access in

subcell2.


Value range 0-100

Unit %

Default value 70



Related

Parameter -

Related

Interface -



4.2.60 Subcell1 Handover in Threshold

Table 4-61 Subcell1 Handover in Threshold

Full name Subcell1 Handover in Threshold

Abbreviation SubCell1InThs

3GPP Name -

3GPP

Reference -

Description This parameter indicates the handover in threshold of subcell1 due

to resource adjustment.


Value range 0-100

Unit %

Default value 40



Related

Parameter -

Related

Interface -

4.2.61 Subcell2 Handover in Threshold

Table 4-62 Subcell2 Handover in Threshold

Full name Subcell2 Handover in Threshold

Abbreviation SubCell2InThs

3GPP Name -

3GPP

Reference -

Description This parameter indicates the handover in threshold of subcell2 due

to resource adjustment.


Value range 0-100



Unit %

Default value 40



Related

Parameter -

Related

Interface -

4.2.62 Subcell Load Balance

Table 4-63 Subcell Load Balance

Full name Subcell Load Balance

Abbreviation SubCellLoadBanlance

3GPP Name -

3GPP

Reference -

Description

This parameter indicates whether to use the new load balance

algorithm. When it is set to “0”, it indicates the initial access and

resource adjustment use the same algorithm as the previous

version (that is, only the load threshold of subcell1 is considered).

When it is set to “1”, the new load balance algorithm is used, that

is, the initial access controls the balance according to each

subcell’s high load threshold, and the adjustment due to

congestion takes the handover out/in load threshold.


Value range 0: No

1: Yes

Unit -

Default value 0: No



Related

Parameter -



Related

Interface -

5 Related Counters and Alarms

5.1 Related Counters

Table 5-1 Counters list

Counter ID Name

C901130001 Number of total available TCH/F of the subcell2

C901130002 Number of total unavailable TCH/F of the subcell2

C901130003 Number of total available TCH/H of the subcell2

C901130004 Number of total unavailable TCH/H of the subcell2

C901130005 Number of handover attempts from the subcell1 to the subcell2

C901130006 Number of handover execution from the subcell1 to the subcell2

C901130007 Number of handover success from the first subcell1 to the subcell2

C901130008 Number of handover attempts from the subcell2 to the subcell1

C901130009 Number of handover execution from the subcell2 to the subcell1

C901130010 Number of handover success from the subcell2 to the subcell1

C901130011 Number of outgoing intra-cell handover attempts of the subcell2

C901130012 Number of outgoing intra-cell handover execution of the subcell2

C901130013 Number of outgoing intra-cell handover success of the subcell2

C901130014 Number of outgoing inter-cell handover attempts of the subcell2

C901130015 Number of outgoing inter-cell handover execution of the subcell2

C901130016 Number of outgoing inter-cell handover success of the subcell2

C901130017 Handover attempts due to UL receiving strength of the FR subcell2

C901130018 Handover attempts due to DL receiving strength of the FR subcell2

C901130019 Handover attempts due to UL quality of the FR subcell2

C901130020 Handover attempts due to DL quality of the FR subcell2

C901130021 Handover attempts due to PBGT of the FR subcell2



C901130022 Handover attempts due to traffics of the FR subcell2

C901130023 Handover attempts due to UL interference of the FR subcell2

C901130024 Handover attempts due to DL interference of the FR subcell2

C901130025 Handover attempts due to GOODCI of the FR subcell2

C901130026 Handover attempts due to BADCI of the FR subcell2

C901130027 Handover attempts due to too large path loss and TA of the FR

second sub cell (on TCH/F)

C901130028 Handover attempts due to too small path loss and TA of the FR


C901130029 Handover attempts due to forcible migration of the FR subcell2

C901130030 Handover attempts due to other causes of the FR subcell2

C901130031 Handover attempts due to UL receiving strength of the HR subcell2

C901130032 Handover attempts due to DL receiving strength of the HR subcell2

C901130033 Handover attempts due to UL quality of the HR subcell2

C901130034 Handover attempts due to DL quality of the HR subcell2

C901130035 Handover attempts due to PBGT of the HR subcell2

C901130036 Handover attempts due to traffics of the HR subcell2

C901130037 Handover attempts due to UL interference of the HR subcell2

C901130038 Handover attempts due to DL interference of the HR subcell2

C901130039 Handover attempts due to GOODCI of the HR subcell2

C901130040 Handover attempts due to BADCI of the HR subcell2

C901130041 Handover attempts due to too large path loss and TA of the HR


C901130042 Handover attempts due to too small path loss and TA of the HR


C901130043 Handover attempts due to forcible migration of the HR subcell2

C901130044 Handover attempts due to other causes of the HR subcell2

C901130045 Number of TCH/F seizure attempts of the subcell2 (used for

assignment)

C901130046 Number of TCH/F seizure success of the subcell2 (used for

assignment)

C901130047 Number of TCH/F seizure failure of the subcell2 (used for

assignment)



C901130048 Number of TCH/F seizure attempts of the subcell2 (used for

handover)

C901130049 Number of TCH/F seizure success of the subcell2 (used for

handover)

C901130050 Number of TCH/F seizure failure of the subcell2 (used for handover)

C901130051 Number of TCH/H seizure attempts of the subcell2 (used for

assignment)

C901130052 Number of TCH/H seizure success of the subcell2 (used for

assignment)

C901130053 Number of TCH/H seizure failure of the subcell2 (used for

assignment)

C901130054 Number of TCH/H seizure attempts of the subcell2 (used for

handover)

C901130055 Number of TCH/H seizure success of the subcell2 (used for

handover)

C901130056 Number of TCH/H seizure failure of the subcell2 (used for handover)

C901130057 Number of TCH/F call drops in the subcell2

C901130058 Number of TCH/H call drops in the subcell2

C901130059 TCH/F busy time in the subcell2

C901130060 TCH/H busy time in the subcell2

C901130061 TCH/F assignment attempts in the subcell2

C901130062 TCH/F assignment success in the subcell2

C901130063 TCH/F handover attempts in the subcell2

C901130064 TCH/F handover success in the subcell2

C901130065 TCH/H assignment attempts in the subcell2

C901130066 TCH/H assignment success in the subcell2

C901130067 TCH/H handover attempts in the subcell2

C901130068 TCH/H handover success in the subcell2

C901130069 Times of TCH/F assignment to the subcell1 when the subcell2

preferred (for assignment)

C901130070 Times of TCH/F assignment to the subcell1 when the subcell2

preferred (for handover)

C901130071 Times of TCH/H assignment to the subcell1 when the subcell2

preferred (for assignment)



C901130072 Times of TCH/H assignment to the subcell1 when the subcell2

preferred (for handover)

C901130073 Number of inter-cell handover attempts to the subcell2 directly in the

site

C901130074 Number of inter-cell handover execution to the subcell2 directly in

the site

C901130075 Number of inter-cell handover success to the subcell2 directly in the

site

C901130076 Number of inter-cell handover attempts to the subcell2 directly in the

BSC

C901130077 Number of inter-cell handover execution to the subcell2 directly in

the BSC

C901130078 Number of inter-cell handover success to the subcell2 directly in the

BSC

C901130079 Number of inter-BSC handover attempts to the subcell2 directly

C901130080 Number of inter-BSC handover execution to the subcell2 directly

C901130081 Number of inter-BSC handover success to the subcell2 directly

C901130082 Times of too fast intra-cell handover to the subcell1 after handover to

the subcell2 directly

C901130083 Times of too fast intra-cell handover to the subcell2 after handover to


C901130084 Times of too fast inter-cell handover to the subcell1 after handover to


C901130085 Times of too fast inter-cell handover to the subcell2 after handover to


C901130086 Number of samples that the subcell2 level is 30dB or above lower

than BCCH level

C901130087 Number of samples that the subcell2 level is 29dB lower than BCCH

level


level


level


level




level


level


level


level


level


level


level


level


level


level


level


level


level


level


level


level


level


level




level


level


level


level


level


level


level

C901130116 Number of samples that the subcell2 level equals to BCCH level

C901130117 Number of samples that the subcell2 level is 1dB higher than BCCH

level


level


level


level


level


level


level


level


level


level




level


level


level


level


level

C901130132 Total number of samples that the subcell2 level differs from BCCH

level

C901130133 Total differences between the subcell2 level and BCCH level

C901130134 Max difference value between the subcell2 level and BCCH level

C901130135 Min difference value between the subcell2 level and BCCH level

C901130136 Number of load-based FR-> HR(V3) handover attempts of the

subcell2

C901130137 Number of load-based FR-> HR(V3) handover execution of the

subcell2

C901130138 Number of load-based FR-> HR(V3) handover success of the

subcell2

C901130139 Number of load-based FR-> HR(V1) handover attempts of the

subcell2

C901130140 Number of load-based FR-> HR(V1) handover execution of the

subcell2

C901130141 Number of load-based FR-> HR(V1) handover success of the

subcell2

C901130142 Number of voice quality-based FR-> HR(V3) handover attempts of

the subcell2

C901130143 Number of voice quality-based FR-> HR(V3) handover execution of

the subcell2

C901130144 Number of voice quality-based FR-> HR(V3) handover success of

the subcell2

C901130145 Number of voice quality-based FR-> HR(V1) handover attempts of

the subcell2



C901130146 Number of voice quality-based FR-> HR(V1) handover execution of

the subcell2

C901130147 Number of voice quality-based FR-> HR(V1) handover success of

the subcell2

C901130150 Number of handover attempt from HR(V1) to FR due to high load

in Subcell2

C901130151 Number of handover from HR(V1) to FR due to high load in Subcell2

C901130152 Number of handover success from HR(V1) to FR due to high load in

Subcell2

C901130153 Number of handover attempt from HR(V3) to FR due to high load

in Subcell2

C901130154 Number of handover from HR(V3) to FR due to high load in Subcell2

C901130155 Number of handover success from HR(V3) to FR due to high load in

Subcell2

C901130156 Number of handover attempts from the first subcell to the second

subcell Due to Load(on TCH/F)

C901130157 Number of handover executions from the first subcell to the second


C901130158 Number of handover successes from the first subcell to the second


C901130159 Number of handover attempts from the first subcell to the second

subcell Due to Load(on TCH/H)

C901130160 Number of handover executions from the first subcell to the second


C901130161 Number of handover successes from the first subcell to the second


C901130162 Number of handover attempts from the second subcell to the first


C901130163 Number of handover executions from the second subcell to the first


C901130164 Number of handover successes from the second subcell to the first


C901130165 Number of handover attempts from the second subcell to the first


C901130166 Number of handover executions from the second subcell to the first


C901130167 Number of handover successes from the second subcell to the first




5.2 Related Alarms

This feature has no related alarms.

6 Engineering Guide

6.1 Application Scenario

This feature is applied in dual-band networking (dual-band cell of 900/1800 MHz co-site

or 850/1900 MHz co-site) or urban area with heavy traffic.

6.2 Configuration Description

1. GSM Logic Configuration—Cell Information Configuration—GSM Cell Configuration,

create a cell (cell8 is used in the test), as shown below.

Figure 6-1 Cell Creation Interface



2. GSM Logic Configuration—Cell Information Configuration—SubCell, create a

sub-cell, which requires creating subcell1 and 2, as shown below.

Figure 6-2 Sub-Cell Creation Interface 1

Figure 6-3 Sub-Cell Creation Interface 2



3. GSM Logic Configuration—Cell Information Configuration—Trx, create TRXs

belonging to subcell1 and 2. Total 6 TRXs are configured for the test, 3 TRXs for

subcell1 and 2 respectively, as shown below.

Figure 6-4 Sub-Cell TRX Creation Interface

GSM Logic Configuration—Cell Information Configuration—Subcell Handover Control,

as shown below.



Figure 6-5 Sub-Cell Handover Parameter Interface 1

Figure 6-6 Sub-Cell Handover Parameter Interface 2



4. GSM Logic Configuration—Cell Information Configuration—Subcell PS

Channel Allocation Configuration, as shown below.

Figure 6-7 Sub-Cell PS Channel Allocation Configuration Interface

5. GSM Logic Configuration—Cell Information Configuration—GSM Cell

Configuration, we can set the value of “SubCell Channel Allocation Control”,

as shown below.



Figure 6-8 Sub-Cell PS Channel Allocation Control Interface

6.3 Feature Validation

6.3.1 Basic Service

Test Item Basic service

Precondition 1. Make sure the CN works well;

2. Make sure the BSC works well;

3. Make sure the SDR works well;

4. Make sure the default cell configuration and

parameters on the BSC are ready;

5. MSs are ready;

6. Ensure good radio environment.

Test Steps Case 1

Block the TCH in subcell1; establish CS (If the call is

established in so short a time under the laboratory

environment, it is suggested to enable parameter

No.28).

Case 2

Block the TCH in subcell2; establish CS.

Case 3

Modify the parameter CRO to make the MS reselect



from CoBCCH1 to CoBCCH2.

Case 4

Enable power control in subcell1 while disable it in

subcell2.

Case 5

Enable power control in subcell2 while disable it in

subcell1.

Case 6

Enable power control in both subcell1 and subcell2.

Set different step length for subcell1 and subcell2.

Anticipative Result Case 1

The MS communicates normally in subcell2.

Case 2

The MS communicates normally in subcell1.

Case 3

The MS reselects successfully.

Case 4

There is power control in subcell1 but not in subcell2.

Case 5

There is power control in subcell2 but not in subcell1.

Case 6

There is power control in both subcell1 and subcell2.

The different power control step length is displayed by

the signaling.

Test Result Pass

Parameters Setting Default parameters

6.3.2 CoBCCH Intra-Cell Handover due to TA and Path Loss

Test Item CoBCCH Intra-Cell Handover due to TA and Path Loss






5. MSs are ready;


Test Steps Case 1

1. Set PathLossMin to “140”;

2. Set SubCellTAMax to “2”;

3. Set SubCellTAMin to “1”;



4. Make the MS call in subcell1.

Case 2

1. Set PathLossMax to “100”;

2. Set SubCellTAMax to “2”;

3. Set SubCellTAMin to “1”;

4. Make the MS call in subcell2.


1. Move the MS to make the call handed over to

subcell2 of the current cell;

2. Trace the execution of SCCP handover through

the signaling; cause of the handover: There is a

better cell.

Case 2

1. Move the MS to make the call handed over to

subcell1 of the current cell;

2. Trace the execution of SCCP handover through

the signaling; cause of the handover: There is a

better cell.

Test Result Pass


6.3.3 Handover between CoBCCH Cell and Other Cells, Co-site (GSM900)

Test Item Handover between CoBCCH Cell and Other Cells, Co-site

(GSM900)






5. MSs are ready;


Test Steps Case 1

Make the MS call in subcell1 of cellA; move the MS.

Case 2


Case 3

Make the MS call in cellB; move the MS.

Case 4





The MS is handed over to cellB.

Case 2


Case 3

The MS is handed over to subcell1 of cellA.

Case 4

The MS is first handed over to subcell1 of cellA, and

then to subcell2 of cellA.

Test Result Pass


6.3.4 Handover between CoBCCH Cell and Other Cells, Co-site (DCS1800)

Test Item Handover between CoBCCH Cell and Other Cells, Co-site

(DCS1800)






5. MSs are ready;


Test Steps Case 1


Case 2


Case 3


Case 4




Case 2


Case 3

The MS is handed over to subcell1 of cellA.

Case 4

The MS is first handed over to subcell1 of cellA, and

then to subcell2 of cellA.



Test Result Pass


6.3.5 Handover between two CoBCCH Cells, Co-site

Test Item Handover between two CoBCCH Cells, Co-site






5. MSs are ready;


Test Steps Case 1


Case 2



The MS is handed over to subcell1 of cellB.

Case 2

The MS is handed over to subcell2 of cellB.

Test Result Pass


6.3.6 PS Service on CoBCCH Cell

Test Item PS Service on CoBCCH Cell






5. MSs are ready;


Test Steps Case 1

1. Block all the channels capable of PS service in

subcell1;

2. Make the MS connected; activate PDP.

Case 2

Subcell1 is preferred for PS.



Case 3

Subcell2 is preferred for PS.


The MS is connected; PDP is not activated.

Case 2

PS uses subcell1.

Case 3

PS uses subcell2 (Subcell1 must have PD channel or

dynamic channel).

Test Result Pass


6.3.7 CS Load Balance in CoBCCH Cell

Test Item CS Load Balance in CoBCCH Cell






5. MSs are ready;


Test Steps Case 1

1. Subcell1 is preferred;

2. TA/path loss (or C/I) meets the criterion of

allocating channels in subcell2;

3. The load of subcell1 exceeds SC1HighLoadThs

while that of subcell2 does not exceed

SC2HighLoadThs.

Case 2

1. Subcell2 is preferred; open UseLoadBalance;

2. TA/path loss (or C/I) meets the criterion of

allocating channels in subcell2;

3. The load of subcell2 exceeds SC1HighLoadThs


SC2HighLoadThs.

Case 3

1. Subcell1 or subcell2 is preferred; open

UseLoadBalance;



2. The load of subcell1 exceeds SC1HoOutLoadThs


SC2HoInLoadThs;

3. The load of subcell2 exceeds SC2HoOutLoadThs


SC1HoInLoadThs.

Case 4

1. SubCellHo or HoToInnerSc indicates the radio

measurement and decides handover to subcell2

is allowed;

2. The target cell opens UseLoadBalance;

3. The target cell prefers subcell1;

4. The load of the target subcell1 exceeds

SC1HighLoadThs while that of subcell2 does not

exceed SC2HighLoadThs;

5. Make PBGT handover.

Case 5

1. SubCellHo or HoToInnerSc indicates the radio

measurement and decides handover to subcell2

is allowed;

2. The target cell opens UseLoadBalance;

3. The target cell prefers subcell2;

4. The load of the target subcell2 exceeds

SC2HighLoadThs while that of subcell1 does not

exceed SC1HighLoadThs;

5. Make PBGT handover.


The MS prefers subcell2 and gets accesses.

Case 2

The MS prefers subcell1 and gets accesses.

Case 3

When applying for or releasing channels, some users

in step 3 are handed over to subcell1.

Case 4

Handover is made to the target cell’s subcell2.

Case 5

Handover is made to the target cell’s subcell1.

Test Result Pass




6.3.8 PS Load Balance in CoBCCH Cell

Test Item PS Load Balance in CoBCCH Cell






5. MSs are ready;


Test Steps Case 1

1. 900M cell is preferred;

2. Enable load balance;

3. C-Value/TA meets the criterion of allocating

1800M channels;

4. The load of 900M is greater than or equal to

SubCell1HighThs while that of 1800M is less than

SubCell2HighThs.

Case 2

1. 1800M cell is preferred;


3. C-Value/TA meets the criterion of allocating

1800M channels;

4. The load of 1800M is greater than or equal to

SubCell2HighThs while that of 900M is less than

SubCell1HighThs.

Case 3

1. 900M cell is preferred; the service is in subcell2;


3. The level/TA must be in subcell1 (C <

byPsDlLevelSc1 or TA > byTALevelSc1);

4. The channels occupied in subcell1 are greater

than or equal to SubCell1InThs while the

channels occupied in subcell2 are less than

SubCell1InThs;

5. Adjust the threshold to make the channels

occupied in subcell1 less than SubCell1InThs.

Case 4

1. 1800M cell is preferred; the service is in subcell1;


3. The level/TA must meet the criterion of subcell2

(C ≥ byPsDlLevelSc2 or TA ≤ byTALevelSc2);



4. The channels occupied in subcell2 are greater

than or equal to SubCell2InThs while the

channels occupied in subcell1 are less than

SubCell2InThs;

5. Adjust the threshold to make the channels

occupied in subcell2 less than SubCell2InThs.

Case 5

1. Apply for/release channels;

2. The target cell enables UseLoadBalance;

3. The load of subcell1 is greater than or equal to

SubCell1PsChanThs while that of subcell2 is less

than SubCell2InThs;

4. Adjust the parameter to make the load of subcell2

greater than or equal to SubCell2PsChanThs

while that of subcell1 is less than SubCell1InThs.


1800M channels are allocated to the service.

Case 2

900M channels are allocated to the service.

Case 3

1. In step 4, channels of subcell2 are requested;

2. In step 5, channels of subcell1 are requested.

Case 4

1. In step 4, channels of subcell1 are allocated;

2. In step 5, channels of subcell2 are allocated.

Case 5

In step 3, move the service from subcell1 to subcell2;

In step 4, move the service from subcell2 to subcell1.

Test Result Pass


6.3.9 Distinction between CoBCCH Assignment and Handover Parameters,

Subcell Penalty Optimization

Test Item Distinction between CoBCCH Assignment and Handover

Parameters, Subcell Penalty Optimization








5. MSs are ready;


Test Steps Case 1

1. Set subcell2 to “preferred”;

2. Make the setting according to the following

requirements: The path loss/TA does not meet

the criterion of subcell2 when assigning, and the

path loss/TA meets the criterion of subcell2 when

there is inter-subcell handover.

Case 2

1. Enable reassignment; set the inter-subcell

handover failure penalty time;

2. Set subcell2 to “preferred”;

3. Create some co-frequency/adjacent frequency

interference on subcell2;

4. The path loss or TA of the

assignment/inter-subcell handover meets the

criterion of subcell2;

5. Make a call.


The MS first accesses subcell1, and then is handed

over to subcell2.

Case 2

After the MS is reassigned to subcell1, it will not be

handed over to subcell2 through the inter-subcell

handover during the penalty time.

Test Result Pass


6.3.10 The Number of Idle Channels Is Valid to Both CoBCCH Subcells

Test Item The Number of Idle Channels Is Valid to Both CoBCCH

Subcells






5. MSs are ready;




Test Steps Case 1

1. Set the threshold of idle CS channels to “1”;

2. Configure four dynamic TCH timeslots and two

static TCH timeslots for the BCCH TRX in

subcell1; the overall TCH timeslots configured for

subcell2 are static;

3. Block all the TRXs except BCCH;

4. Make a PS service, and continue ping packet

testing;

5. Make a pair of CS calls;

6. Unblock one TRX in subcell2;

7. Set the PS to “prefer 900M cell”, and make a PS

service;

8. Hang up the CS service; repeat step 7.


1. In step 4, the PS service uses four dynamic

TCHs;

2. In step 5, the call uses two TCHs and preempts

one PS timeslot to reserve for CS;

3. According to step 6, after one TRX in subcell2 is

unblocked, the preempted dynamic TCH is not

used by the timeslot for extension though the idle

CS channel number is greater than the number

reserved;

4. In step 7, the new PS service does not use the

dynamic TCH preempted before;

5. In step 8, after the CS service is hung up, the new

PS service can use the dynamic TCH which is

preempted before for extension.

Test Result Pass


6.4 Feature Turn off

If we doesn’t configure subcell2, the feature will be turned off.



6.5 Network Impact

Scenario

Scenario Feature Recom-

mendati

on

Effect Analysis Coverage TRX

Dense

urban

Continuous

coverage in

internal circle

No special

requiremen

ts

Highest

1. Good effect

2. Stable

indices

1. In whole coverage area of CoBCCH cell,

1800M and 900M have the same covering

capacity.

2. Adjusts parameters to enable 1800M to

absorb more traffic.

Urban

Discontinuou

s coverage

in internal

circle

External

circle ≥

internal

circle

Higher

1. Good effect

2. Indices are

controllable

after

adjustment.

1. Distances between sites are large. In whole

coverage area of CoBCCH cell, 1800M covers

more than 1/2 900M areas, absorbing traffics in

most areas.

2. 900M has more TRXs to cover the left ares,

featuring less risks of congestion. 3. Adjusts

parameters to enable 1800M to absorb more

traffics, and 900M ensures coverage effect.

Urban

Discontinuou

s coverage

in internal

circle

External

circle <

internal

circle

Medium

1. Common

effect

2. External

circle suffers

heavy

congestion.

3. Indices are

poor.

1. Distances between sites are large. In whole

coverage area of CoBCCH cell, 1800M covers

more than 1/2 900M areas, absorbing traffics in

most areas.

2. 900M has less TRXs. It might appear

congestion in busy hour. 1800M is idle.

Handover success rate is lower from 900M to

1800M. 1800M channel occupation success

rate is low.

3. It is difficult to adjust parameters.

Suburb

Too small

coverage of

internal circle

External

circle ≥

internal

circle

Medium

1. Common

effect

2. External

circle suffers

heavy

congestion.

3. Indices are

poor.

1. Distances between sites are large. 1800M

coverage range is small, failing in effectively

absorbing traffics.

2. It might appear congestion at 900M in busy

hour. 1800M is idle. Handover success rate is

lower from 900M to 1800M. 1800M channel

occupation success rate is low.


Rural

Highway

Suburb Too small

coverage of

internal circle

External

circle <

internal

Low

1. Poor effect

2. External

circle suffers

1. Distances between sites are large. 1800M

coverage range is small, failing in effectively

absorbing traffics. Rural



Scenario

Scenario Feature Recom-

mendati

on

Effect Analysis Coverage TRX

Highway

circle seriously

heavy

congestion.

3. Indices are

deteriorated

sharply.

2. 900M has less TRXs. It might appear

congestion in busy hour. 1800M is idle.

Handover success rate is lower from 900M to

1800M. 1800M channel occupation success

rate is low.


7 Abbreviation Abbreviations Full Characteristics

3GPP 3rd

Generation Partnership Project

BCCH Broadcast Control Channel

BSC Base Station Controller

C/I Carrier/Interference

MSC Mobile services Switching Centre

SDCCH Stand-alone Dedicated Control Channel

TA Timing Advance

TCH Traffic Channel

8 Reference Document

ZXG10 iBSC (V6.30.10) Base Station Controller Performance Counter Reference

ZXG10 iBSC (V6.30.10) Base Station Controller Radio Parameter Reference

Date post:	11-Dec-2015
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ZGO-04-02-005 Co-BCCH Feature Guide ZXG10-iBSC (V12.3.0)20131014

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