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6 HandoverAbout This Chapter

6.1 Overview

This describes handover. Controlled by the network, handover is a basic function of the mobile

communications system. Handover ensures the continuity of mobile services.

6.2 Availability

This describes the availability of handover. The realization of handover depends on the

cooperation of relevant NEs and software.

6.3 Technical DescriptionThis describes Huawei handover algorithm from a technical perspective. As a whole, Huawei

handover algorithm is composed of handover preprocessing and handover decision.

6.4 Implementation

This describes how to configure the handover and the power boost before handover.

6.5 Maintenance Information

This lists the performance counters related to handover.

6.6 References

The references indicate the documents about handover from the related standard organizations.

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6.1 Overview

This describes handover. Controlled by the network, handover is a basic function of the mobile

communications system. Handover ensures the continuity of mobile services.

Definition

Handover is a process in which a conversation can be sustained when an MS moves from one

cell to another in order to meet the requirement of network management.

Purposes

As a method of radio link control, handover enables an MS to keep a conversation sustainable

when the MS travels across different cells. In addition, handover can optimize the overall

performance of the system through the adjustment of traffic volume by means of parameters.

Terms

Terms Definition

Ping-pong

handover

Ping-pong handover occurs when an MS is handed over back and forth between

two cells due to the changes in signal quality or the improper settings of the

parameters.

Co-site

neighbor

cells

Neighbor cells under the same BTS.

Raileigh

fading

In radio propagation, signals inevitably suffer from short-period amplitude

changes. Raileigh fading relates to frequency. In other words, signal fading is

frequency-specific.

Chain

neighbor

cell

Chain neighbor cell is a parameter of the neighbor cell relation property. During

the quick handover, the MS can be handed over to only the neighbor cells of the

serving cell. In addition, the neighbor cells and the serving cell must be

configured in chain mode. Generally, the two neighbor cells in the direction of

the fast movement of the MS are configured as chain neighbor cells. The

configurations depend on the actual conditions.

ATCBhandover

ATCB handover is a special method of determining the boundary between anoverlaid subcell and an underlaid subcell for the enhanced dual-band network.

The coverage area of the overlaid subcell is determined through the

ATCB_THRD, the ATCB_HYST, and the difference between the signal

strength of the serving cell and that of the neighbor cell.

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Terms Definition

Frequency

offset

When the transmit source of the radio wave is far from the receive party, the

wavelength is long and the frequency is low. When the transmit source is close

to the receive party, the wavelength is short and the frequency is high. The BTS

carrying the serving cell can calculate the frequency offset (indicated by f)

through the signals transmitted by the moving MS. If the absolute value of f

is great, you can infer that the MS is moving fast. If f is a positive number, you

can infer that the MS is moving toward the BTS. If f is a negative number, you

can infer that the MS is moving away from the BTS.

Different

frequencie

s set

In FH mode, the different frequencies set refers to a certain FH group. In non-

FH mode, the different frequencies set refers to a certain frequency.

Enhanced

measurem

ent report

The enhanced measurement report is a new downlink measurement report,

reported by the MS. Compared with the normal measurement report, some new

measurements are added, such as BER, FER, and so on. The enhancedmeasurement report provides the measurement information of up to 15 neighbor

GSM/WCDMA cells, whereas the normal measurement report provides the

measurement information of 6 neighbor GSM cells at most.

FULL

SET

The FULL SET refers to the signal RX level and quality of TCH channels when

the BTS performs full power emission.

SUB SET The SUB SET refers to the signal RX level and quality of TCH channels in DTX

mode.

Ec/N0 Ec/No means Signal Noise Ratio in WCDMA. It maps with C/I in GSM.

Acronyms and Abbreviations

AcronymsandAbbreviations Full Spelling

MS Mobile Station

BSC Base Station Controller

MR Measure report

BQ Bad Quality

TA Timing Advance

BSIC Base Station Identity Code

BER Bit Error Ratio

BCCH Broadcast Control CHannel

AMR Adaptive Multi Rate

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AcronymsandAbbreviations Full Spelling

ATCB Adapter Distance To Cell Border

RQI Radio Quality Indication

RSCP Received Signal Code Power

CPICH Common Pilot Channel

PBGT Power Budget Handover

6.2 AvailabilityThis describes the availability of handover. The realization of handover depends on the

cooperation of relevantNEs and software.

NEs Involved

Table 6-1 lists the network elements involved in handover.

Table 6-1 NEs involved in handover

MS BTS BSC MSC MGW SGSN GGSN HLR

NOTE

l : NEs not involved

l : involved

Software Releases

Table 6-2 lists the versions of GBSS products that support handover.

Table 6-2 GBSS products and software versions

Product Version

BSC BSC6000 V900R008C01 and later releases

BTS BTS3012 DTRU BTS3000V100R001C01 and later releases

QTRU BTS3000V100R008C01 and later releases

BTS3012AE DTRU BTS3000V100R001C04 and later releases

QTRU BTS3000V100R008C01 and later releases

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Product Version

BTS3006C BTS3000V100R002C01 and later releases

BTS3002E BTS3000V100R002C01 and later releases

DBS3036 BTS3000V100R008C01 and later releases

BTS3036 BTS3000V100R008C02 and later releases

BTS3036A BTS3000V100R008C02 and later releases

Miscellaneous

None

6.3 Technical Description

This describes Huawei handover algorithm from a technical perspective. As a whole, Huawei

handover algorithm is composed of handover preprocessing and handover decision.

Handover Preprocessing

Handover preprocessing consists of the following contents:

l Handover Preparation

l Handover Penaltyl Neighbor Cell Sorting

l Network Characteristic Adjustment

l Forced handover processing

l Power boost before HO enabled

Handover Decision

Handover decision is categorized into the following types:

l Quick handover (consisting of quick PBGT handover and frequency offset handover).

Good services can be provided when the speech quality deteriorates during the fast

movement of an MS. Quick handover is mainly applicable to the railway scenario.

l Emergency handover. Emergency handover can keep a call sustainable when the radio

environment severely deteriorates. Theoretically, the emergency handover algorithm

produces greater error in evaluating the target cell than that produced by other handover

algorithms. In normal cell, frequent emergency handovers should be avoided.

l Enhanced dual-band network handover. In an enhanced dual-band network, the resources

in the overlaid 1800M subcell and underlaid 900M subcell can be shared during the

assignment and handover procedures. That is, the calls in the high-traffic 900M subcell can

be moved to the low-traffic 1800M subcell to achieve traffic balance.

l

Load handover. Load handover can enable the load of system traffic to be shared so thatthe deterioration of local counters is minimized.

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l General handover. General handover can ensure good services when an MS is moving.

Figure 6-1 shows the priority and handover algorithm of each type of handover decision:

Figure 6-1 Handover decision

TA handover

Emergency handover

Interference handover

Quick level drop handover

Bad quality handover

Quick handover

Enhanced dual-band network handover

Load handover

General handover

Edge handover

Fast-moving micro cell handover

Inter-layer (better cell) handover

PBGT handover

AMR handover

Better 3G cell handover

TIGHT BCCH handover algorithm

6.3.1 Handover Preprocessing

This describes handover preprocessing. Based on the neighbor cell information and configured

parameters in the measurement report, the system performs handover preprocessing and adjusts

the priority of a neighbor cell.

Measurement Report

The BSC decodes neighbor cell information from the measurement report.

The processing can be performed either on the BSC side or on the BTS side.

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l IfMR.Preprocessing is set to No, then the processing is performed on the BSC side.

NOTE

MR.Preprocessing is set to No by default.

l

IfMR.Preprocessing is set to Yes, then the processing is performed on the BTS side. Bysetting the parameters Transfer Original MR, Transfer BS/MS Power Class and Sent

Freq.of preprocessed MR, you can specify the contents of the MRs to be provided and

the period during which the MRs are provided. In this way, the signaling throughput on the

Abis interface and the usage of the BSC can be decreased.

The MR can be classified into enhanced MR and normal MR, the parameterReport Type

determines which type is used.

In the MR, the TCH measurement of the serving cell is classified into FULL SET and SUB SET.

The parameterDtxMeasUsed determines whether the DTX is used during measurement when

the MS and BTS report MRs.

According to the BCCH frequencies and BSIC reported by an MS, the corresponding neighborcell index is detected. Then the uplink part and downlink part of the measurement report is read.

l If measurement reports are issued continuously, they are directly interposed in the

measurement report queue.

l If measurement reports are issued discontinuously and the number of lost measurement

reports is smaller than Allowed M.R Number Lost, the system performs operations as

follows:

For the serving cell, the MRs are linear interpolated.

For the neighbor cell, the lowest values are applied to the lost measurement values

according to the protocols; that is, level 0 (-110 dBm) is applied in interpolation.

NOTE

The same method is applied in the condition that no MR due to low RX level in the neighbor

cell.

l If measurement reports are issued discontinuously and the number of lost measurement

reports is greater than Allowed M.R Number Lost, the previous measurement reports are

discarded. When new measurement reports arrive, calculation is performed again.

Filtering treatment is performed on measurement reports, that is, a number of consecutive

measurement reports are obtained from the queue. Averaging treatment is performed on uplink/

downlink RX level, uplink/downlink RX quality, TA, RQI, BTS power, 2G neighbor cell level,

and the CPICH, RSCP, and Ec/No of 3G neighbor cell. The averaging treatment minimizes the

effect of abrupt changes in individual measurement report values on the result of handoverdecision.

The number of consecutive measurement reports needed in filtering is different according to the

measurement object and channel type, as listed in Table 6-3.

Table 6-3 Parameters related to the number of measurement reports

MeasurementObject

ChannelType Parameter

Receive level of the

serving cell

SDCCH Filter Length for SDCCH Level

TCH Filter Length for TCH Level

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MeasurementObject

ChannelType Parameter

Quality of the

serving cell

SDCCH Filter Length for SDCCH Qual

TCH Filter Length for TCH Qual

TA of the serving

cell

- Filter Length for TA

Receive level of the

neighbor cell

BCCH Filter Length for Ncell RX_LEV

Power of the BTS in

the serving cell

TCH Filter Length for TCH Level

RQI TCH Filter Length for TCH Qual

If consecutive measurement reports are insufficient, you can infer that filtering fails. Then

handover decision is not performed.

Quick Handover Preparation

The preparation of quick handover involves the following main aspects:

l Frequency offset is decoded from the measurement report.

Frequency offset of the MS is obtained from the uplink measurement report from the BTS

by the BSC.l filtering is performed to the measurement report.

Handover Penalty

The handover penalty is performed in the following conditions: quick handover succeeds, TA

emergency handover succeeds, BQ emergency handover succeeds, quick micro cell handover

succeeds, OL subcell to UL subcell handover within an enhanced concentric cell succeeds, and

handover failure.

l After the quick handover, TA emergency handover, or BQ emergency handover is

successful, the actual RX level of the old cell is subtracted with related value during the

penalty. Table 6-4 lists the related parameters.

Table 6-4 Parameters related to the number of measurement reports

Handover Parameter

Quick

handover

Quick Handover Punish Time(s)

Quick Handover Punish Value

TA

Handove

r

Penalty Level after TA HO

Penalty Time after TA HO(s)

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Handover Parameter

BQ

handover

Penalty Level after BQ HO

Penalty Time after BQ HO(s)

l After the quick micro cell handover is successful, penalty is performed on all the neighbor

cells of the micro cell. Related parameters are Penalty on Fast Moving HO and Penalty

Time on Fast Moving HO(s).

l After the OL subcell to UL subcell handover within an enhanced concentric cell is

successful, the call handover from OL subcell to UL subcell is not allowed within Penalty

Time of UtoO HO(s).

l After the OL subcell to UL subcell handover in the enhanced dual-band network is

successful, the call handover from OL subcell to UL subcell is not allowed within Inter

UL And OL Subcells HO Penalty Time(s).l After the handover fails, different penalties are performed to the target cell according to

different causes:

If the handover to a neighbor 2G or 3G cell fails, the actual RX level of the target cell

is decreased by Penalty Level after HO Fail for neighbor cell queuing during the

penalty.

NOTE

According to the cause of handover failure,the penalty time can be classified into three

types:UmPenaltyTimer,RscPenaltyTimer,andCfgPenaltyTimer.

If the OL subcell to UL subcell handover within an enhanced concentric cell fails, the

call handover from OL subcell to UL subcell is not allowed within Penalty Time afterOtoU HO Fail(s).

If the UL subcell to OL subcell handover within an enhanced concentric cell fails, the

call handover from UL subcell to OL subcell is not allowed within Penalty Time after

UtoO HO Fail(s).

Neighbor Cell Basic Queuing

The purpose of neighbor cell basic queuing is to produce the candidate cell list with the following

information taken into account after handover penalty: RX level of the serving cell and neighbor

cells contained in the MRs, hysteresis, usage of TCHs in the neighbor cells, and so on.

l In non-direct retry situation, if an MS in a BSC external cell occupies an SDCCH and Inter-

BSC SDCCH HO ALLowed is set to No, then the cell should be removed from the

candidate cell list; that is, the handover to the BSC external cell is prohibited.

l If a neighbor 2G cell is in the same BSC with the serving cell and the TCH usage of the

neighbor cell is 100%, then the neighbor cell is removed from the candidate cell list; that

is, the handover to this neighbor cell is prohibited.

l If the downlink RX level of a neighbor 2G cell is lower than the sum ofMin DL Power

on HO Candidate Cell and NCell Interf Type, then the neighbor cell should be removed

from the candidate cell list; that is, the handover to this neighbor cell is prohibited.

l If the uplink RX level of a neighbor cell is lower than the sum ofMin UP Power on HO

Candidate Cell and NCell Interf Type, then the neighbor cell should be removed fromthe candidate cell list; that is, the handover to this neighbor cell is prohibited.

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l If a 3G neighbor cell is an FDD cell, the cell is processed according to the FDD REP

QUANT:

IfFDD REP QUANT is set to Ec/N0, then if the Ec/N0 of the cell is less than Min Ec/

No Threshold, the neighbor cell should be removed from the candidate cell list; that

is, the handover to this neighbor cell is prohibited. IfFDD REP QUANT is set to RSCP, then if the RSCP of the cell is less than Min

RSCP Threshold, the neighbor cell should be removed from the candidate cell list; that

is, the handover to this neighbor cell is prohibited.

l If a 3G neighbor cell is a TDD cell, and if the RSCP of the cell is less than Min RSCP

Threshold, then the neighbor cell should be removed from the candidate cell list; that is,

the handover to this neighbor cell is prohibited.

l Calculate the difference between the downlink RX level of the neighbor cells and the

downlink RX level of the serving cell. Based on the difference, sort the neighbor cells in a

descending order.

Network Characteristic Adjustment

Network characteristic adjustment is a process in which the position of each cell is determined

in the queue of candidate cells based on the related network information. Network characteristic

adjustment provides the final list of candidate cells for handover decision.

After the network characteristic adjustment, the candidate cells (consisting of neighbor cells and

serving cell) are sorted in descending order by priority. Then the handover decision procedure

starts.

Forced Handover

If the forced handover is triggered, the subsequent handover decision is not performed.

Purpose of the forced handover:

l If no TCH is available in the serving cell during the MS access process, the direct retry

procedure is performed when Direct Retry is set to Yes.

l When BTS maintenance is performed, the MSs under control of the related BTS should be

handed over to the cells controlled by a functional BTS to ensure that no call drops occur

during BTS maintenance.

The forced handover is categorized into the following four types:

l Outgoing cell handover (directed retry)

l Outgoing BTS handover

l Outgoing BSC handover

l Specified cell list handover

Power Boost Before Handover

When the MS is in a corner, the level may decrease swiftly. At this time, the handover may be

triggered. Then, the power control algorithm may fail to adjust the MS and BTS power, thus

causing the MS fails to receive the handover command and call drops.

By quickly adjusting the BTS transmit power to the maximum level before sending the handovercommand to the MS and shielding the BTS power control function during the handover, that is,

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keep the maximum BTS transmit power during the handover, a high handover success rate is

ensured.

Power boost before handover can be controlled through Power boost before HO enabled or

not.

6.3.2 Handover Decision Algorithm

This describes the handover decision algorithm. After measurement reports are preprocessed,

the handover decision procedure starts. According to the emergency condition of an MS in the

network, the handover decision algorithm performs decision in the following order: quick

handover, emergency handover, enhanced dual-band handover, load handover, and then general

handover.

The handover decision consists of the following two steps:

l Determines whether the serving cell meets the triggering conditions.

l Selects the candidate cells.

The candidate cells is selected based on Inter-RAT HO Preference:

l When Inter-RAT HO Preference is set to Pre_2G_Cell:

If there is no eligible neighbor 2G cell but with eligible neighbor 3G cells, then the 3G cell

is selected.

l When Inter-RAT HO Preference is set to Pre_3G_Cell:

The 3G cell is preferred.

l When Inter-RAT HO Preference is set to Pre_2G_CellThres:

If the RX level of 2G candidate cell is smaller than or equal to HO Preference Threshold

for 2G Cell, then the 3G cell is preferred.

If the emergency handover conditions are met and the number of candidate cells is not zero, then

the emergency handover timerMin Interval for Emerg.HOs is started. Another emergency

handover can be decided only when Min Interval for Emerg.HOs expires.

Quick Handover

This describes quick handover. The handover aims to increase the handover success rate of an

MS moving at a high speed and to ensure the call continuity and low call drop rate. Quick

handover applies to the urban backbone roads, selected routes, and high-speed railroads.

Quick Handover Types

Quick handover consists of frequency offset handover and quick PBGT handover.

l Frequency offset handover

According to the frequency offset information reported by an MS moving at a high speed,

whether the MS is far from the serving cell is determined. Frequency offset handover

decision is performed according to the uplink/downlink level of the serving cell and the

path loss of the neighbor cell.

l Quick PBGT handover

Quick PBGT handover decision is performed according to the path loss of the neighborcell.

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For quick handover, the handover response speed is enhanced through the following ways:

l Accurately calculating the moving speed of the MS

l Derestricting the interval between handover precisions

l Reducing the number of measurement reports for the handover decision

l Introducing the filtering

Triggering Condition

Whether the conditions of frequency offset handover are met is determined during handover

decision. When the BTS cannot report the frequency offset information or the reported frequency

offset information is invalid, fast PBGT handover is triggered if the other conditions of frequency

offset handover are met.

If the Quick Handover Enable is set to Yes, the triggering conditions of quick handover are as

follows:

l The MS is far from the serving cell (the frequency offset in the measurement result message

is a negative value) and the moving speed of the MS is higher than Quick Move Speed

Thres.

l The uplink level of the serving cell after filtering is lower than Quick Handover Up

Trigger Level.

l The downlink level of the serving cell after compensation is lower than Quick Handover

Down Trigger Level.

l The path loss of the configured chain neighbor cell is smaller than a certain threshold of

the path loss of the serving cell. In other words, PBGT(n) is equal to or greater than 0.

The triggering decisions of quick handover are as follows:

l If the last three conditions are met, the decision is performed as follows:

If the first condition is met, a frequency offset handover is performed.

If the first condition is not met, a quick PBGT handover is performed.

l If not all the last three conditions are met, quick handover is not triggered.

Target Cell Selection

The target cell must be a chain neighbor cell of the serving cell. The target cell can be obtained

through the setting ofChain Neighbor Cell.

Limitations

The limitations on quick handover are as follows:

l The target cell cannot serve as the serving cell.

l The candidate cells for quick handover must be chain neighbor cells of the serving cell.

Each cell can be configured with a maximum of three chain neighbor cells.

l After quick handover is successful, penalty is performed on the originating cell during the

penalty time to prevent an immediate switchback to the cell. The penalty time and penalty

value depend on Quick Handover Punish Time and Quick Handover Punish Valuerespectively.

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TA Handover

This describes TA handover. TA handover is a kind of emergency handover. TA handover

performs handover decision based on the TA value reported by an MS.

The TA value of an ordinary cell ranges from 0 to 63. The TA value of the underlaid subcell ina double-timeslot cell ranges from 0 to 229. The step of each bit is 553.5 m. If the TA value is

set to 63, you can infer that the distance is 35 km.


TA handover is triggered when the following conditions are met:

l TA HO Allowed is set to Yes.

l Filtered TA value reported by the MS through measurement reports is greater than or equal

to TA Threshold.

The TA handover can be triggered only when all the previous conditions are met.

NOTE

From the perspective of the triggering condition forTA handover, TA can be regarded as a criterion for

limiting the size of a cell.


A target cell should be the cell with the highest priority among the queue of sorted candidate

cells after preprocessing. In addition, the target cell should meet the following limitations:

l

The target cell cannot serve as the serving cell.l If the TA Threshold of a co-site neighbor cell lower than or equal to the TA Threshold

of the serving cell, a handover to the cell is forbidden.

l After the TA handover succeeds, penalty is performed on the source cell. During Penalty

Time after TA HO(s), the Penalty Level after TA HO is subtracted from the level of the

source cell to avoid an immediate handover back to the source cell.

If the triggering conditions of TA handover are met, and there is no 2G candidate cell, the

following operation is performed:

l If a neighbor 3G cell is available, the 2G/3G inter-RAT handover is performed when

Outgoing-RAT HO Allowed is set to Yes and the MS supports the 2G/3G inter-RAT

handover.

l If no neighbor 3G cell is available, orOutgoing-RAT HO Allowed is set to No, or the MS

does not support the 2G/3G inter-RAT handover, then the decision on another emergency

handover type is performed.

BQ Handover

This describes BQ handover. BQ handover is a kind of emergency handover. BQ handover

performs decision based on the uplink/downlink RX quality on the Um interface.

The RX quality is measured in bit error ratio (BER). The BSC measures the quality of a radio

link based on the quality class in the measurement report. The probable reason for an increasein BER is that the signal power is too low or the channel interference becomes great.

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IfBQ HO Allowed is set to Yes, the triggering conditions of BQ handover are as follows:

l The uplink RX quality is greater than or equal to the uplink RX quality threshold of the

serving cell.

l The downlink RX quality is greater than or equal to the downlink RX quality threshold of

the serving cell.

The BQ handover is triggered if either of the previous conditions is met.

The configuration parameters for uplink and downlink RX quality threshold are as follows:

l For non-AMR calls, the configuration parameters for uplink RX quality threshold is UL

Qual. Threshold, the configuration parameters for downlink RX quality threshold is DL

Qual. Threshold.

l

For AMR calls, the configuration parameters for uplink RX quality threshold isULQuaLimitAMRFR, the configuration parameters for downlink RX quality threshold

is DLQuaLimitAMRFR.

l For AMR HR calls, the configuration parameters for uplink RX quality threshold is

ULQuaLimitAMRHR, the configuration parameters for downlink RX quality threshold

is DLQuaLimitAMRHR.


A target cell should be the cell with the highest priority in the list of sorted candidate cells after

the preprocessing procedure. In addition, the target cell should meet the following limitations:

l If the target cell is a neighbor cell, the RX level of the target cell must meet the following

formula:

Filtered downlink RX level of the neighbor cell > Filtered downlink RX level of the serving

cell + Min Access Level Offset of the serving cell configured for the neighbor cell - Chain

Neighbor Cell

NOTE

If there is only one cell in the candidate cell queue and the cell is a neighbor cell, then no such

requirement is needed.

l If there is no neighbor cell, Intracell HO Allowed is set to Yes, and the serving cell is not

in intra-cell handover penalty state, then the MS is handed over to the serving cell. A channel

with different frequency band, different frequencies set, different TRX, or different timeslotis preferred (priority: different frequency band > different frequencies set > different TRX

> different timeslot).

After the BQ handover succeeds, penalty is performed on the source cell. During the Penalty

Time after BQ HO(s), the Penalty Level after BQ HO is subtracted from the level of the source

cell to avoid an immediate handover back to the source cell.

If the triggering conditions of BQ handover are met, and there is no 2G candidate cell, the

following operation is performed:

l If a neighbor 3G cell is available, the 2G/3G inter-RAT handover is performed when

Outgoing-RAT HO Allowed is set to Yes and the MS supports the 2G/3G inter-RAThandover.

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The target cell selection has the following restrictions:

l For the handover due to high underlaid subcell load, the MS can be handed over to only

the overlaid subcell.

l For the handover due to low underlaid subcell load, the MS can be handed over to only the

underlaid subcell.

l For the call movement handover in the overlaid subcell, the MS is handed over to the

neighbor cell that ranks first among the neighbor cells. The MS cannot be handed over to

the cell that ranks behind the serving cell. The target cell is generally the underlaid subcell.

It can also be other neighbor cells.

Limitations

The limitations on the handover due to high underlaid subcell load are as follows:

l The cell where the call is located is on the enhanced dual-band network. The

HW_Concentric Attribute is set to Underlay cell.

l The Load HO From UL Subcell to OL Subcell Allowed parameter is set.

l The maximum range of the handover zone is 63 to Incoming OL Subcell HO level

Threshold. The handover starts from the high level.

The limitations on the handover due to low underlaid subcell load are as follows:


HW_Concentric Attribute is set to Overlay cell.

l The Load HO of OL Subcell to UL Subcell Enabled parameter is set.

l The maximum range of the handover zone is 63 to Outgoing OL Subcell HO level

Threshold. The handover starts from the low level.

The limitations on call movement handover in the overlaid subcell are as follows:


HW_Concentric Attribute is set to Overlay cell.

Effect of the Enhanced Dual-Band Network Handover on the Existing Algorithm

The effect of the enhanced dual-band network handover on the existing algorithm is as follows:

l On the enhanced dual-band network, to prevent the common load handover from colliding

with the handover between OL subcell and UL subcell on the network, for the common

load handover of the cells on the network, the MS cannot be handed over to the cell in the

same group when the load handover switches between the overlaid subcell and the underlaid

subcell on the network (Load HO From UL Subcell to OL Subcell Allowed and Load

HO of OL Subcell to UL Subcell Enabled) are enabled.

l Because the PBGT handover algorithm may cause inter-cell handover, the MS cannot be

handed over the cell in the same group in the case of PBGT handover between the cells on

the enhanced dual-band network.

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Figure 6-3 Load handover

CONF_HO_RXLEV

CONF_HO_RXLEV+CLS_Ramp

CONF_HO_RXLEV+CLS_Offset

Cell A Cell B

Border of normal handoverLoad handover band

Triggering Conditions

If the Load HO Allowed is set to Yes, the triggering conditions of load handover are as follows:

l The CPU usage of the system is smaller than or equal to System Flux Threshold for Load

HO.

l The current load of the serving cell is greater than or equal to Load HO Threshold.


The selection conditions for target cell are as follows:

l Filtered RX level after penalty is greater than or equal to the sum ofInter-layer HOThreshold and Inter-layer HO Hysteresis.

l The MS cannot be handed over to the serving cell.

l If the target cell is in the same BSC with the source cell, then the current load of the target

cell is lower than Load Req.on Candidate Cell.

l If the target cell is not in the same BSC with the source cell, then the load handover occurs

when the target cell is not 100% occupied.

Examples

The system assigns MSs to different load handover bands based on the downlink RX level. Theload handover algorithm performs handover on the cell so that the MS is handed over out of the

cell step by step.

1. The MSs in load handover band 1 are handed over to the neighbor cells. Load handover

band 1 refers to the area where the downlink level ranges from Edge HO DL RX_LEV

Threshold to Edge HO DL RX_LEV Threshold + Load HO Step Level.

2. After one Load HO Step Period, the MSs in load handover band 2 are handed over to the

neighbor cells. Load handover band 2 refers to the area where the downlink level ranges

from Edge HO DL RX_LEV Threshold to Edge HO DL RX_LEV Threshold + (2 x

Load HO Step Level).

3. The load handover stops when the flow of the cell is less than or equal to Load HOThreshold.

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Load handover uses the step-by-step outgoing handover mode so that the possibility of a sharp

increase in CPU load is eliminated and the occurrence of call drops due to congested target cell

is avoided.

Edge HandoverThis describes edge handover. Based on level, edge handover is a kind of general handover.

If edge handover is triggered, the level of the target cell should be at least one hysteresis value

(Inter-cell HO Hysteresis) higher than the level of the serving cell.


IfFringe HO Allowed is set to Yes, the triggering conditions of edge handover are as follows:

l One of the following conditions is met.

The filtered downlink RX level of the serving cell is smaller than Edge HO DLRX_LEV Threshold

The filtered uplink RX level of the serving cell is smaller than Edge HO UL RX_LEV

Threshold

l The RX level of neighbor cell is greater than the sum of the RX level of serving cell and

Inter-cell HO Hysteresis.

The edge handover is triggered when the P/N criterion is met, that is, the previous conditions

are met forEdge HO Valid Time(s) during Edge HO Watch Time(s).

Figure 6-4 shows the edge handover.

Figure 6-4 Edge handover

Cell 2Cell 1

-97 dBm -85 dBm


A target cell should have the highest priority among the candidate cells. In addition, a target cell

should meet the following conditions:

l The MS cannot be handed overto the serving cell.

l After the sorting, the target cell must have a higher priority than the serving cell.

A cell can become a target cell if the previous conditions are met forEdge HO AdjCell Valid

Time(s) during Edge HO AdjCell Watch Time(s).

If the triggering conditions of edge handover are met, and there is no 2G candidate cell, thefollowing operation is performed:

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If the PBGT HO Allowed is set to Yes, the triggering conditions of PBGT handover are as

follows:

l The target cell and the serving cell are at the same layer and in the same hierarchy.

l The downlink level meets the following formula forPBGT Valid Time(s) during PBGT

Watch Time(s):

(MIN(MS_TXPWR_MAX,P) RXLEV_DL PWR_DIFF) (MIN(MS_TXPWR_MAX

(n),P) RXLEV_NCELL(n)) > PBGT_HO_MARGIN

The parameters are described as follows:

RXLEV_DL: It indicates the downlink receive level in the serving cell after the filtering

treatment. If the enhanced concentric cell function is enabled in the serving cell, the

value indicates the downlink receive level in the serving cell that serves as the neighbor

cell, that is, the downlink receive level of BCCH TRXs.

MS_TXPWR_MAX: It indicates the maximum transmit power of an MS permitted inthe serving cell.

MS_TXPWR_MAX (n): It indicates the maximum transmit power of an MS permitted

in neighbor cell n.

RxLev_NCELL (n): It indicates the downlink receive level in neighbor cell n.

PWR_DIFF: It indicates the difference between the maximum downlink transmit power

in the serving cell due to power control and the actual downlink transmit power in the

serving cell.

P: It indicates the maximum transmit power capability of an MS.

PBGT_HO_MARGIN: It is the difference between the PBGT HO Threshold of the

serving cell and 64.

The PBGT handover can be triggered only when all the previous conditions are met.


A target cell should meet the following conditions:

l The target cell and the serving cell are at the same layer and in the same hierarchy.

l The serving cell cannot serve as the target cell.

l Among the sorted candidate cells after the preprocessing procedures, the target cell has the

highest priority.

Other Handovers

This describes other handovers, which consist of AMR handover and better 3G cell handover.

AMR Handover

Refer to 10 AMR.

Better 3G Cell Handover

Refer to 7 2G/3G Interoperability.

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TIGHT BCCH Handover Algorithm

Refer to 51 BCCH Dense Frequency Multiplexing.

6.4 ImplementationThis describes how to configure the handover and the power boost before handover.

6.4.1 Configuring the Handover

This describes how to configure handover on the BSC6000 Local Maintenance Terminal.

6.4.2 Configuring Power Boost Before Handover

This describes how to configure power boost before handover on the BSC6000 Local

Maintenance Terminal.

6.4.1 Configuring the HandoverThis describes how to configure handover on the BSC6000 Local Maintenance Terminal.

Context

Before configuring the parameters related to the handover decision algorithm, you need to

configure the relation between neighbor cells.

On the BSC6000 Local Maintenance Terminal, right-click a cell on the Management Tree

tab page. Then, select Set Adjacent Relation Property on the shortcut menu. A dialog box is

displayed, as shown in Figure 6-7.

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Figure 6-9 Set Handover Parameter dialog box

Step 5 ClickAdvanced. A dialog box is displayed as shown in Figure 6-10. You can set correspondingparameters.

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6.4.2 Configuring Power Boost Before Handover

This describes how to configure power boost before handover on the BSC6000 Local

Maintenance Terminal.

Procedure

Step 1 On the BSC6000 Local Maintenance Terminal, right-click a cell on the Management Treetab page. Then, select Configure Cell Attributes.

Step 2 In the displayed dialog box, double-click the target cell in the Cell view list box to add it to theSelected cells list box. Then, clickNext.

Step 3 In the Cells to be set list box, select the target cell, and then clickSet Cell Properties. A dialogbox is displayed, as shown in Figure 6-15.

Figure 6-15 Set Cell Attributes dialog box

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Step 4 ClickOther Attributes. A dialog box is displayed, as shown in Figure 6-16.

Set Power Boost before HO enabled or not.

Figure 6-16 Set Other Parameter dialog box

Step 5 ClickOK. The configuration is complete.

----End

6.5 Maintenance Information

This lists the performance counters related to handover.

Alarms

None

Counters

Table 6-5 lists the counters related to handover.

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Table 6-5 Counters related to handover

Counter Description

H3000 Internal Intra-Cell Handover Requests (SDCCH)

H3009 Internal Intra-Cell Handover Requests (TCH)

H3010 Internal Intra-Cell Handover Commands

(SDCCH)


(TCHF)


(TCHH)

H3020 Failed Internal Intra-Cell Handovers (SDCCH)

H3029 Failed Internal Intra-Cell Handovers (TCH)

H3020A Failed Internal Intra-Cell Handovers (Channel

Unavailable) (SDCCH)

H3029A Failed Internal Intra-Cell Handovers (Channel

Unavailable) (TCH)

H302B Failed Internal Intra-Cell Handovers (Terrestrial

Resource Request Failed)

H302G Failed Internal Intra-Cell Handovers (A Interface

Failure)

H3020C Failed Internal Intra-Cell Handovers (Timer

Expired) (SDCCH)

H3027Cb Failed Internal Intra-Cell Handovers (Timer

Expired) (TCHF) (Signaling Channel)

H3028Cb Failed Internal Intra-Cell Handovers (Timer

Expired) (TCHH) (Signaling Channel)

H3027Ca Failed Internal Intra-Cell Handovers (Timer

Expired) (TCHF) (Traffic Channel)

H3028Ca Failed Internal Intra-Cell Handovers (TimerExpired) (TCHH) (Traffic Channel)

H302Da Failed Internal Intra-Cell Handovers

(Reconnection to Old Channels) (Abnormal

Release, Unspecified)

H302Db Failed Internal Intra-Cell Handovers


Release, Channel Unacceptable)

H302Dc Failed Internal Intra-Cell Handovers


Release, Timer Expired)

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Counter Description

H302Dd Failed Internal Intra-Cell Handovers


Release, No Activity on the Radio Path)

H302De Failed Internal Intra-Cell Handovers

(Reconnection to Old Channels) (Preemptive

Release)

H302Df Failed Internal Intra-Cell Handovers

(Reconnection to Old Channels) (Handover

Failed, Timing Advance out of Range)

H302Dg Failed Internal Intra-Cell Handovers

(Reconnection to Old Channels) (Channel Mode

Unavailable)

H302Dh Failed Internal Intra-Cell Handovers

(Reconnection to Old Channels) (Frequency

Unavailable)

H302Di Failed Internal Intra-Cell Handovers

(Reconnection to Old Channels) (Call Already

Cleared)

H302Dj Failed Internal Intra-Cell Handovers

(Reconnection to Old Channels) (Semantically

Incorrect Message)

H302Dk Failed Internal Intra-Cell Handovers(Reconnection to Old Channels) (Invalid

Mandatory Information)

H302Dl Failed Internal Intra-Cell Handovers

(Reconnection to Old Channels) (Message Type

Non-existent or Not Implemented)

H302Dm Failed Internal Intra-Cell Handovers


Not Compatible with Protocol State)

H302Dn Failed Internal Intra-Cell Handovers

(Reconnection to Old Channels) (Conditional IEError)

H302Do Failed Internal Intra-Cell Handovers

(Reconnection to Old Channels) (No Cell

Allocation Available)

H302Dp Failed Internal Intra-Cell Handovers

(Reconnection to Old Channels) (Protocol Error

Unspecified)

H302Dq Failed Internal Intra-Cell Handovers

(Reconnection to Old Channels) (Other Causes)

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Counter Description

H3024B Failed Internal Intra-Cell Handovers (Dynamic

Conversion, SDCCH-TCH)

H3055A Internal Intra-Cell Handovers Not Initiated(AMR) (TCHF-TCHH)

H3055B Internal Intra-Cell Handovers Not Initiated

(AMR) (TCHH-TCHF)

H3005A Internal Intra-Cell Handover Requests (AMR)

(TCHF-TCHH)

H3005B Internal Intra-Cell Handover Requests (AMR)

(TCHH-TCHF)

H3015A Internal Intra-Cell Handover Commands (AMR)

(TCHF-TCHH)

H3015B Internal Intra-Cell Handover Commands (AMR)

(TCHH-TCHF)

H3025A Failed Internal Intra-Cell Handovers (AMR)

(TCHF-TCHH)

H3025B Failed Internal Intra-Cell Handovers (AMR)

(TCHH-TCHF)

H3040 Internal Intra-Cell Handover Detection Messages

Received by BSC (SDCCH)


Received by BSC (TCHF)


Received by BSC (TCHH)

H3200W Incoming Internal Inter-Cell Handover Requests

(SDCCH) (900/850-900/850)

H3200X Incoming Internal Inter-Cell Handover Requests

(SDCCH) (1800/1900-1800/1900)

H3200Y Incoming Internal Inter-Cell Handover Requests(SDCCH) (900/850-1800/1900)

H3200Z Incoming Internal Inter-Cell Handover Requests

(SDCCH) (1800/1900-900/850)

H3209W Incoming Internal Inter-Cell Handover Requests

(TCH) (900/850-900/850)

H3209X Incoming Internal Inter-Cell Handover Requests

(TCH) (1800/1900-1800/1900)

H3209Y Incoming Internal Inter-Cell Handover Requests

(TCH) (900/850-1800/1900)

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Counter Description

H3209Z Incoming Internal Inter-Cell Handover Requests

(TCH) (1800/1900-900/850)

H3210W Incoming Internal Inter-Cell HandoverResponses (SDCCH) (900/850-900/850)

H3210X Incoming Internal Inter-Cell Handover

Responses (SDCCH) (1800/1900-1800/1900)

H3210Y Incoming Internal Inter-Cell Handover

Responses (SDCCH) (900/850-1800/1900)

H3210Z Incoming Internal Inter-Cell Handover

Responses (SDCCH) (1800/1900-900/850)

H3217W Incoming Internal Inter-Cell Handover

Responses (TCHF) (900/850-900/850)


Responses (TCHF) (1800/1900-1800/1900)


Responses (TCHF) (900/850-1800/1900)


Responses (TCHF) (1800/1900-900/850)

H3218W Incoming Internal Inter-Cell Handover

Responses (TCHH) (900/850-900/850)


Responses (TCHH) (1800/1900-1800/1900)


Responses (TCHH) (900/850-1800/1900)


Responses (TCHH) (1800/1900-900/850)

H3220W Failed Incoming Internal Inter-Cell Handovers

(SDCCH) (900/850-900/850)

H3220X Failed Incoming Internal Inter-Cell Handovers(SDCCH) (1800/1900-1800/1900)

H3220Y Failed Incoming Internal Inter-Cell Handovers

(SDCCH) (900/850-1800/1900)

H3220Z Failed Incoming Internal Inter-Cell Handovers

(SDCCH) (1800/1900-900/850)

H3229W Failed Incoming Internal Inter-Cell Handovers

(TCH) (900/850-900/850)

H3229X Failed Incoming Internal Inter-Cell Handovers

(TCH) (1800/1900-1800/1900)

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Counter Description

H3229Y Failed Incoming Internal Inter-Cell Handovers

(TCH) (900/850-1800/1900)

H3229Z Failed Incoming Internal Inter-Cell Handovers(TCH) (1800/1900-900/850)

H3220A Failed Incoming Internal Inter-Cell Handovers

(No Channel Available) (SDCCH)

H3229A Failed Incoming Internal Inter-Cell Handovers

(No Channel Available) (TCH)

H322B Failed Incoming Internal Inter-Cell Handovers

(Terrestrial Resource Request Failed)

H322D Failed Incoming Internal Inter-Cell Handovers

(Reconnection to Old Channels)

H322G Failed Incoming Internal Inter-Cell Handovers

(A Interface Failure)

H3220C Failed Incoming Internal Inter-Cell Handovers

(Timer Expired) (SDCCH)

H3227Cb Failed Incoming Internal Inter-Cell Handovers

(Timer Expired) (TCHF) (Signaling Channel)

H3228Cb Failed Incoming Internal Inter-Cell Handovers

(Timer Expired) (TCHH) (Signaling Channel)

H3227Ca Failed Incoming Internal Inter-Cell Handovers

(Timer Expired) (TCHF) (Traffic Channel)

H3228Ca Failed Incoming Internal Inter-Cell Handovers

(Timer Expired) (TCHH) (Traffic Channel)

H3240 Incoming Internal Inter-Cell Handover Detection

Messages Received by BSC (SDCCH)

H3247 Incoming Internal Inter-Cell Handover Detection

Messages Received by BSC (TCHF)

H3248 Incoming Internal Inter-Cell Handover DetectionMessages Received by BSC (TCHH)

H3100W Outgoing Internal Inter-Cell Handover Requests

(SDCCH) (Excluding Directed Retry)

(900/850-900/850)

H3100X Outgoing Internal Inter-Cell Handover Requests


(1800/1900-1800/1900)

H3100Y Outgoing Internal Inter-Cell Handover Requests


(900/850-1800/1900)

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Counter Description

H3100Z Outgoing Internal Inter-Cell Handover Requests


(1800/1900-900/850)


(TCHF) (Excluding Directed Retry)

(900/850-900/850)



(1800/1900-1800/1900)



(900/850-1800/1900)



(1800/1900-900/850)


(TCHH) (Excluding Directed Retry)

(900/850-900/850)



(1800/1900-1800/1900)

H3108Y Outgoing Internal Inter-Cell Handover Requests(TCHH) (Excluding Directed Retry)

(900/850-1800/1900)



(1800/1900-900/850)


(Directed Retry) (900/850-900/850)


(Directed Retry) (1800/1900-1800/1900)


(Directed Retry) (900/850-1800/1900)


(Directed Retry) (1800/1900-900/850)

H3110W Outgoing Internal Inter-Cell Handover

Command (SDCCH) (Excluding Directed Retry)

(900/850-900/850)

H3110X Outgoing Internal Inter-Cell Handover

Commands (SDCCH) (Excluding Directed Retry)

(1800/1900-1800/1900)

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Counter Description

H3110Y Outgoing Internal Inter-Cell Handover


(900/850-1800/1900)

H3110Z Outgoing Internal Inter-Cell Handover


(1800/1900-900/850)


Commands (TCHF) (Excluding Directed Retry)

(900/850-900/850)



(1800/1900-1800/1900)



(900/850-1800/1900)



(1800/1900-900/850)


Commands (TCHH) (Excluding Directed Retry)

(900/850-900/850)

H3118X Outgoing Internal Inter-Cell HandoverCommands (TCHH) (Excluding Directed Retry)

(1800/1900-1800/1900)



(900/850-1800/1900)



(1800/1900-900/850)


Commands (Directed Retry) (900/850-900/850)


Commands (Directed Retry)

(1800/1900-1800/1900)





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Counter Description

H3120W Failed Outgoing Internal Inter-Cell Handovers


(900/850-900/850)

H3120X Failed Outgoing Internal Inter-Cell Handovers


(1800/1900-1800/1900)

H3120Y Failed Outgoing Internal Inter-Cell Handovers


(900/850-1800/1900)

H3120Z Failed Outgoing Internal Inter-Cell Handovers


(1800/1900-900/850)



(900/850-900/850)



(1800/1900-1800/1900)



(900/850-1800/1900)

H3127Z Failed Outgoing Internal Inter-Cell Handovers(TCHF) (Excluding Directed Retry)

(1800/1900-900/850)



(900/850-900/850)



(1800/1900-1800/1900)


(TCHH) (Excluding Directed Retry)(900/850-1800/1900)

H3128Z Failed Outgoing Internal Inter-Cell Handovers


(1800/1900-900/850)


(Directed Retry) (900/850-900/850)


(Directed Retry) (1800/1900-1800/1900)

6 Handover



6-47
http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-http://-/?-

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Counter Description


(Directed Retry) (900/850-1800/1900)

H3121Z Failed Outgoing Internal Inter-Cell Handovers(Directed Retry) (1800/1900-900/850)

H312A Failed Outgoing Internal Inter-Cell Handovers

(No Channel Available)

H312B Failed Outgoing Internal Inter-Cell Handovers


H312G Failed Outgoing Internal Inter-Cell Handovers (A

Interface Failure)

H3120C Failed Outgoing Internal Inter-Cell Handovers

(Timer Expired) (SDCCH) (Excluding DirectedRetry)

H3127Cb Failed Outgoing Internal Inter-Cell Handovers

(Timer Expired) (TCHF) (Signaling Channel)

H3128Cb Failed Outgoing Internal Inter-Cell Handovers

(Timer Expired) (TCHH) (Signaling Channel)

H3127Ca Failed Outgoing Internal Inter-Cell Handovers

(Timer Expired) (TCHF) (Traffic Channel)

H3128Ca Failed Outgoing Internal Inter-Cell Handovers

(Timer Expired) (TCHH) (Traffic Channel)


(Timer Expired) (Directed Retry)

H312Da Failed Outgoing Internal Inter-Cell Handovers


Release, Unspecified)

H312Db Failed Outgoing Internal Inter-Cell Handovers


Release, Channel Unacceptable)

H312Dc Failed Outgoing Internal Inter-Cell Handovers(Reconnection to Old Channels) (Abnormal

Release, Timer Expired)

H312Dd Failed Outgoing Internal Inter-Cell Handovers


Release, No Activity on the Radio Path)

H312De Failed Outgoing Internal Inter-Cell Handovers

(Reconnection to Old Channels) (Preemptive

Release)

6 Handover



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Counter Description

H312Df Failed Outgoing Internal Inter-Cell Handovers

(Reconnection to Old Channels) (Handover

Failed, Timing Advance out of Range)

H312Dg Failed Outgoing Internal Inter-Cell Handovers

(Reconnection to Old Channels) (Channel Mode

Unavailable)

H312Dh Failed Outgoing Internal Inter-Cell Handovers

(Reconnection to Old Channels) (Frequency

Unavailable)

H312Di Failed Outgoing Internal Inter-Cell Handovers

(Reconnection to Old Channels) (Call Already

Cleared)

H312Dj Failed Outgoing Internal Inter-Cell Handovers

(Reconnection to Old Channels) (Semantically

Incorrect Message)

H312Dk Failed Outgoing Internal Inter-Cell Handovers

(Reconnection to Old Channels) (Invalid

Mandatory Information)

H312Dl Failed Outgoing Internal Inter-Cell Handovers


Non-existent or Not Implemented)

H312Dm Failed Outgoing Internal Inter-Cell Handovers(Reconnection to Old Channels) (Message Type

Not Compatible with Protocol State)

H312Dn Failed Outgoing Internal Inter-Cell Handovers

(Reconnection to Old Channels) (Conditional IE

Error)

H312Do Failed Outgoing Internal Inter-Cell Handovers

(Reconnection to Old Channels) (No Cell

Allocation Available)

H312Dp Failed Outgoing Internal Inter-Cell Handovers

(Reconnection to Old Channels) (Protocol ErrorUnspecified)

H312Dq Failed Outgoing Internal Inter-Cell Handovers

(Reconnection to Old Channels) (Other Causes)

H310A Outgoing Internal Inter-Cell Handover Requests

(Uplink Quality)

H310B Outgoing Internal Inter-Cell Handover Requests

(Downlink Quality)

H310C Outgoing Internal Inter-Cell Handover Requests

(Uplink Strength)

6 Handover



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Counter Description

H310D Outgoing Internal Inter-Cell Handover Requests

(Downlink Strength)

H310E Outgoing Internal Inter-Cell Handover Requests(Timing Advance)

H310F Outgoing Internal Inter-Cell Handover Requests

(Better Cell)

H310G Outgoing Internal Inter-Cell Handover Requests

(Load)

H310H Outgoing Internal Inter-Cell Handover Requests

(Rapid Level Drop)

H310I Outgoing Internal Inter-Cell Handover Requests

(MSC Intervention)

H310J Outgoing Internal Inter-Cell Handover Requests

(OM Intervention)

H310L Outgoing Internal Inter-Cell Handover Requests

(Other Causes)

H311A Outgoing Internal Inter-Cell Handover

Commands (Uplink Quality)

H311B Outgoing Internal Inter-Cell Handover

Commands (Downlink Quality)

H311C Outgoing Internal Inter-Cell Handover

Commands (Uplink Strength)

H311D Outgoing Internal Inter-Cell Handover

Commands (Downlink Strength)

H311E Outgoing Internal Inter-Cell Handover

Commands (Timing Advance)

H311F Outgoing Internal Inter-Cell Handover

Commands (Better Cell)

H311G Outgoing Internal Inter-Cell HandoverCommands (Load)

H311H Outgoing Internal Inter-Cell Handover

Commands (Rapid Level Drop)

H311I Outgoing Internal Inter-Cell Handover

Commands (MSC Intervention)

H311J Outgoing Internal Inter-Cell Handover

Commands (OM Intervention)

H311L Outgoing Internal Inter-Cell Handover

Commands (Other Causes)

6 Handover



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Counter Description

H3122A Failed Outgoing Internal Inter-Cell Handovers

(Uplink Quality)

H3122B Failed Outgoing Internal Inter-Cell Handovers(Downlink Quality)


(Uplink Strength)

H3122D Failed Outgoing Internal Inter-Cell Handovers

(Downlink Strength)

H3122E Failed Outgoing Internal Inter-Cell Handovers

(Timing Advance)

H3122F Failed Outgoing Internal Inter-Cell Handovers

(Better Cell)

H3122G Failed Outgoing Internal Inter-Cell Handovers

(Load)

H3122H Failed Outgoing Internal Inter-Cell Handovers

(Rapid Level Drop)

H3122I Failed Outgoing Internal Inter-Cell Handovers

(MSC Intervention)

H3122J Failed Outgoing Internal Inter-Cell Handovers

(OM Intervention)

H3122L Failed Outgoing Internal Inter-Cell Handovers

(Other Causes)

H3400W Incoming External Inter-Cell Handover Requests

(SDCCH) (900/850-900/850)

H3400X Incoming External Inter-Cell Handover Requests

(SDCCH) (1800/1900-1800/1900)

H3400Y Incoming External Inter-Cell Handover Requests

(SDCCH) (900/850-1800/1900)

H3400Z Incoming External Inter-Cell Handover Requests(SDCCH) (1800/1900-900/850)

H3409W Incoming External Inter-Cell Handover Requests

(TCH) (900/850-900/850)

H3409X Incoming External Inter-Cell Handover Requests

(TCH) (1800/1900-1800/1900)

H3409Y Incoming External Inter-Cell Handover Requests

(TCH) (900/850-1800/1900)

H3409Z Incoming External Inter-Cell Handover Requests

(TCH) (1800/1900-900/850)

6 Handover



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Counter Description

H3410W Incoming External Inter-Cell Handover

Responses (SDCCH) (900/850-900/850)

H3410X Incoming External Inter-Cell HandoverResponses (SDCCH) (1800/1900-1800/1900)

H3410Y Incoming External Inter-Cell Handover

Responses (SDCCH) (900/850-1800/1900)

H3410Z Incoming External Inter-Cell Handover

Responses (SDCCH) (1800/1900-900/850)


Responses (TCHF) (900/850-900/850)

H3417X Incoming External Inter-Cell Handover

Responses (TCHF) (1800/1900-1800/1900)


Responses (TCHF) (900/850-1800/1900)


Responses (TCHF) (1800/1900-900/850)


Responses (TCHH) (900/850-900/850)

H3418X Incoming External Inter-Cell Handover

Responses (TCHH) (1800/1900-1800/1900)


Responses (TCHH) (900/850-1800/1900)


Responses (TCHH) (1800/1900-900/850)

H3420W Failed Incoming External Inter-Cell Handovers

(SDCCH) (900/850-900/850)

H3420X Failed Incoming External Inter-Cell Handovers

(SDCCH) (1800/1900-1800/1900)

H3420Y Failed Incoming External Inter-Cell Handovers(SDCCH) (900/850-1800/1900)

H3420Z Failed Incoming External Inter-Cell Handovers

(SDCCH) (1800/1900-900/850)

H3429W Failed Incoming External Inter-Cell Handovers

(TCH) (900/850-900/850)

H3429X Failed Incoming External Inter-Cell Handovers

(TCH) (1800/1900-1800/1900)

H3429Y Failed Incoming External Inter-Cell Handovers

(TCH) (900/850-1800/1900)

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Counter Description

H3429Z Failed Incoming External Inter-Cell Handovers

(TCH) (1800/1900-900/850)

H3401B Incoming External Inter-Cell Handover TCHRequests (TCHF Only)

H3401C Incoming External Inter-Cell Handover TCH

Requests (TCHH Only)

H3401D Incoming External Inter-Cell Handover TCH

Requests (TCHF Preferred,Channel Type

Unchangeable)

H3401E Incoming External Inter-Cell Handover TCH

Requests (TCHH Preferred, Channel Type

Unchangeable)

H3401G Incoming External Inter-Cell Handover TCH

Requests (TCHF Preferred, Channel Type

Changeable)

H3401H Incoming External Inter-Cell Handover TCH

Requests (TCHH Preferred, Channel Type

Changeable)

H3401F Incoming External Inter-Cell Handover TCH

Requests (TCHF or TCHH, Channel Type

Unchangeable)

H3401I Incoming External Inter-Cell Handover TCH

Requests (TCHF or TCHH, Channel Type

Changeable)

H342I Failed Incoming External Inter-Cell Handovers

(Invalid Message)

H3420A Failed Incoming External Inter-Cell Handovers

(No Channel Available) (SDCCH)

H3429A Failed Incoming External Inter-Cell Handovers

(No Channel Available) (TCH)

H342E Failed Incoming External Inter-Cell Handovers

(CIC Unavailable)

H342F Failed Incoming External Inter-Cell Handovers

(CIC Allocated)

H342B Failed Incoming External Inter-Cell Handovers


H342H Failed Incoming External Inter-Cell Handovers

(Clear Commands Sent By MSC)

6 Handover



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Counter Description

H3420C Failed Incoming External Inter-Cell Handovers

(Timer Expired) (SDCCH)

H3429Cb Failed Incoming External Inter-Cell Handovers(Timer Expired) (TCH) (Signaling Channel)

H3429Ca Failed Incoming External Inter-Cell Handovers

(Timer Expired) (TCH) (Traffic Channel)

H3440 Incoming External Inter-Cell Handover

Detection Messages Received by BSC (SDCCH)


Detection Messages Received by BSC (TCHF)


Detection Messages Received by BSC (TCHH)

H3300W Outgoing External Inter-Cell Handover Requests


(900/850-900/850)

H3300X Outgoing External Inter-Cell Handover Requests


(1800/1900-1800/1900)

H3300Y Outgoing External Inter-Cell Handover Requests


(900/850-1800/1900)

H3300Z Outgoing External Inter-Cell Handover Requests


(1800/1900-900/850)

H3310W Outgoing External Inter-Cell Handover


(900/850-900/850)

H3310X Outgoing External Inter-Cell Handover


(1800/1900-1800/1900)

H3310Y Outgoing External Inter-Cell Handover


(900/850-1800/1900)

H3310Z Outgoing External Inter-Cell Handover


(1800/1900-900/850)



(900/850-900/850)

6 Handover



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Counter Description



(1800/1900-1800/1900)



(900/850-1800/1900)



(1800/1900-900/850)



(900/850-900/850)



(1800/1900-1800/1900)



(900/850-1800/1900)



(1800/1900-900/850)

H3311W Outgoing External Inter-Cell HandoverCommands(Directed R

Date post:	05-Apr-2018
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