Idle Mode Behavior(GBSS14.0_01)

7/27/2019 Idle Mode Behavior(GBSS14.0_01)

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Idle Mode Behavior GBSS14.0

Feature Parameter Description

Issue 01

Date 2012-04-28

HUAWEI TECHNOLOGIES CO., LTD.


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Copyright Huawei Technologies Co., Ltd. 2012. All rights reserved.No part of this document may be reproduced or transmitted in any form or by any means without prior written consent of Huawei Technologies Co., Ltd.

Trademarks and Permissions

and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd.

All other trademarks and trade names mentioned in this document are the property of their respectiveholders.

NoticeThe purchased products, services and features are stipulated by the contract made between Huawei andthe customer. All or part of the products, services and features described in this document may not bewithin the purchase scope or the usage scope. Unless otherwise specified in the contract, all statements,information, and recommendations in this document are provided "AS IS" without warranties, guarantees or representations of any kind, either express or implied.

The information in this document is subject to change without notice. Every effort has been made in thepreparation of this document to ensure accuracy of the contents, but all statements, information, andrecommendations in this document do not constitute the warranty of any kind, express or implied.

Huawei Technologies Co., Ltd.

Address: Huawei Industrial Base

Bantian, Longgang

Shenzhen 518129

People's Republic of China

Website: http://www.huawei.com

Email: [email protected]
http://www.huawei.com/http://www.huawei.com/mailto:[email protected]:[email protected]:[email protected]://www.huawei.com/


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GSM BSSIdle Mode Behavior Contents

Issue 01 (2012-04-28) Huawei Proprietary and ConfidentialCopyright Huawei Technologies Co.,

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iii

3.8.6 System Information Type 7 ................................................................................................. 3-23

3.8.7 System Information Type 8 ................................................................................................. 3-23

3.8.8 System Information Type 13 ............................................................................................... 3-24

3.9 Short Message Service Cell Broadcast ...................................................................................... 3-24

3.10 Public Voice Group Call Service ............................................................................................... 3-25

3.10.1 Overview ........................................................................................................................... 3-25

3.10.2 System Information ........................................................................................................... 3-25

4 Parameters .................................................................................................................................. 4-1

5 Counters ...................................................................................................................................... 5-1

6 Glossary ...................................................................................................................................... 6-1

7 Reference Documents ............................................................................................................. 7-1


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GSM BSSIdle Mode Behavior 1 About This Document


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1 About This Document1.1 ScopeThis document describes the behavior of the MS in idle mode and of the network. The behavior includesthe procedures of public land mobile network (PLMN) selection, cell selection, cell reselection, locationarea update, paging, and cell broadcast. This document also describes control channels and systeminformation.

1.2 Intended AudienceThis document is intended for:

Personnel who need to understand the Idle Mode Behavior feature Personnel who work with Huawei GSM products

1.3 Change HistoryThe section provides information about the changes in different document versions.

There are two types of changes, which are defined as follows:

Feature change: refers to a change in the Idle Mode Behavior feature of a specific product version. Editorial change: refers to a change in wording or the addition of information that was not described inthe earlier version.

Document Issues

The document issue is as follows:

01 (2012-04-28) Draft A (2012-02-15)

01 (2012-04-28)

This is the first release of GBSS14.0.

Compared with issue draft A (2012-02-15) of GBSS14.0, issue 01 (2012-04-28) of GBSS14.0 has nochange.

Draft A (2012-02-15)

Compared with issue 01 (2011-03-31) of GBSS13.0, issue Draft A (2012-02-15) of GBSS14.0 has nochange.


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GSM BSSIdle Mode Behavior 2 Overview


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2 Overview An MS that is switched on but is not allocated a dedicated channel is defined as an MS in idle mode. AnMS in idle mode can access the network and can be reached by the network.

When an MS is switched on, it attempts to select a PLMN for registration. The MS selects a PLMN either automatically or manually. In the selected PLMN, the MS searches for a suitable cell and then tunes tothe control channel of the selected cell to receive system information. This procedure is called cellselection.

The MS in idle mode always attempts to camp on the best cell according to a signal strength basedcriterion. After the MS camps on a cell, the received signal strength may deteriorate due to interferenceor MS mobility. In this case, the MS can select another cell to camp on. This procedure is called cellreselection.

When a cell selection or cell reselection is complete, the MS camps on the selected cell.

After the MS selects a PLMN and finds a suitable cell, the MS must register its current location on thenetwork so that the network knows where to route incoming calls. The MS may move from place to place,and therefore the location changes from time to time. In certain conditions, the MS may initiate a locationarea update procedure so that the network can locate the MS in real time.

When receiving an incoming call, the network searches for the MS and sends the paging messageaccording to the registered location of the MS.

The idle mode behavior is managed by the MS and is controlled by the parameters contained in thesystem information that is broadcast on the BCCH.

The idle mode behavior has the following impacts on the network performance and service handling:

Selection of the cell with the best signal strength

In the case of cell selection and cell reselection, the MS always attempts to select the cell with the bestsignal strength to achieve a better QoS. Cell selection and cell reselection are controlled byparameters. By adjusting the settings of these parameters, a cell absorbs MSs in a controlled manner.

Control of the paging loadIn idle mode, the MS notifies the network of its location whenever the MS changes its location areathrough the location area update procedure. Then, the network stores the latest location informationabout the MS. When the network receives an incoming call, it knows in which location area it can pagethe MS and does not need to page the MS throughout the service area. This reduces the paging load.If the MS does not respond to the first paging message, the network may send a second pagingmessage.The MS, periodically and when switched on or off, notifies the network of its present status through thelocation area update procedure. This prevents the network from paging the MS when the MS has beenswitched off or has left the coverage area. Otherwise, this causes unnecessary load to the system.

Low power consumptionIn idle mode, the MS discontinuously listens to the system information of the serving cell and performsmeasurements on neighboring cells to evaluate whether a cell change is required. The MS is in sleepmode in most time. Therefore, the power consumption of the MS is low in idle mode.


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GSM BSSIdle Mode Behavior 3 Technical Description


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3-1

3 Technical Description3.1 Overview

In idle mode, the MS continuously measures the transmit signal strength on the BCCH carrier frequencies of the serving cell and neighboring cells to find a suitable cell to camp on. The MS may alsoregister the location information about the selected cell through a location area update procedure asrequired.

After camping on a cell, an MS can:

Receive system information from the cell Access the RACH of the cell to initiate a call Receive a paging message from the network when there is an incoming call

The tasks performed by an MS in idle mode can be divided into four procedures. Figure 3-1 illustratesthe relationships between the four procedures.

1. PLMN selection2. Cell selection3. Cell reselection4. Location area update

Figure 3-1 Relationships between the four procedures


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3.2 PLMN Selection

3.2.1 Overview

The MS will select a PLMN when it is switched on or re-enters the network coverage area. It will attemptto select the last registered PLMN if any exists. When the MS is successfully registered on a PLMN, itshows this PLMN on its screen. The MS is allowed to initiate or receive calls on this PLMN. If there is nolast registered PLMN or if the last registered PLMN is unavailable, the MS will attempt to select another PLMN either automatically or manually, depending on its operating mode.

The MS usually performs operations on its home PLMN. When the MS leaves the coverage area of thehome PLMN, it may select another PLMN. If the MS finds a suitable cell to camp on or if a location areaupdate request is accepted, the MS will register on the PLMN. The registration on the PLMN has to besuccessful in order for the MS to access the network.

In the case of national roaming, the MS may select and register on a visited PLMN. In this case, the MSperiodically attempts to return to its home PLMN. The time interval between two consecutive attempts is

stored in the subscriber identity module (SIM) and is managed by the network operator.In the case of international roaming, the MS may select and register on a visited PLMN. In this case, theMS does not attempt to return to its home PLMN.

PLMN selection can be performed in automatic mode or manual mode.

In automatic mode, the MS selects a PLMN from a PLMN list. The PLMNs in the list are ranked inorder of priority.

In manual mode, the user selects a PLMN among those indicated by the MS. The user can request theMS to select and register on an available PLMN as required.

3.2.2 Automatic PLMN Selection ModeIn automatic mode, the MS selects a PLMN that is available and permitted. If there is no last registeredPLMN or the last registered PLMN is unavailable, the MS selects a PLMN in the following order:

1. Home PLMN2. Each PLMN stored in the SIM, in priority order 3. Other PLMNs with receive level above -85 dBm, in random order 4. All other PLMNs in descending order of signal strength

3.2.3 Manual PLMN Selection ModeIn manual mode, if a registered PLMN or the home PLMN exists, the MS first attempts to select the

PLMN. If registration fails or the user starts a PLMN reselection, the MS displays all available PLMNs.The user can then select a desired PLMN, which causes the MS to initiate a registration on this PLMN. If the selected PLMN is forbidden, the MS prompts the user to select another PLMN.

3.3 GSM Cell SelectionThis section describes the feature GBFD-110401 Basic Cell Selection.

3.3.1 OverviewWhen an MS is switched on or enters the network coverage area, it scans all the carrier frequenciespermitted by the PLMN and selects a suitable cell to camp on. This procedure is called cell selection.


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3.3.2 Conditions for Normally Camping on a CellTo perform services normally, an MS must camp on a suitable cell by registering on the PLMN and tuningto the control channel of the cell. Then, the MS can receive system information and paging messagesand initiate calls. A cell is considered suitable when the following conditions are met:

The cell belongs to the selected PLMN. The cell is not barred.

For details about whether a cell is barred, see Table 3-1 .

The cell does not belong to a location area included in the list of "forbidden location areas for roaming."

The path loss from the MS to the BTS is lower than the preset threshold, that is, C1 must be greater than 0.

3.3.3 Cell Selection CriterionC1 indicates the path loss criterion of cell selection. C1 of the serving cell must be greater than 0. It iscalculated as follows:

C1 = RXLEV - RXLEV_ACCESS_MIN - MAX((MS_TXPWR_MAX_CCH - P), 0)

In the case of a DCS1800 class 3 MS, C1 is calculated as follows:

C1=RXLEV - RXLEV_ACCESS_MIN - MAX((MS_ TXPWR_MAX_CCH + POWER OFFSET - P), 0)

where:

RXLEV indicates the average receive level of the MS in the unit of dBm. RXLEV_ACCESS_MIN indicates the minimum receive level (unit: dBm) required for the MS to accessthe network. It is specified by the RXMIN parameter.

MS_TXPWR_MAX_CCH indicates the maximum transmit power (unit: dBm) allowed for the MS toaccess the network. It is specified by the FMSMAXOPCC parameter.

POWER OFFSET indicates PWRDIV (unit: dBm) of the MS. The setting of the PWRDIVIND parameter determines whether PWRDIV takes effect.

P indicates the maximum output power of the MS in the unit of dBm.

The MS selects a cell to camp on according to the cell selection priority and C1. The selected cellbecomes the serving cell. As shown in Figure 3-2 , if the two cells have the same cell selection priority,the MS selects Cell1, the one with the higher path loss criterion, as the serving cell.

Figure 3-2 Cell selection

Cell2Cell1

C1=15 C1=8

The cell selection priority is determined by CB Q and CELLBARACCESS2 , as listed in Table 3-1 .
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Table 3-1 Cell selection priority

CBQCELLBARACCESS2

Cell SelectionPriority

Cell Reselection Priority

0 0 Normal Normal0 1 Forbidden Forbidden

1 0 Low Normal

1 1 Low Normal

3.4 GSM Cell ReselectionThis section describes the feature GBFD-110402 Basic Cell Re-selection.

3.4.1 Overview After an MS selects a suitable cell as the serving cell, the MS camps on this cell if there are no changesin other conditions. At the same time, the MS continues to monitor all the BCCH carrier frequenciesspecified in the neighboring cell frequency list (BA1 list), which is indicated by the system information of the serving cell.

For each BCCH carrier frequency, the MS needs to measure the receive level at not less than fivesampling points and calculates the average receive level. The total number of sampling points for eachBCCH carrier frequency should be the same. In each measurement period, the number of samplingpoints for each BCCH carrier frequency should also be the same. The six strongest BCCH carrier frequencies need to be updated at least every minute. To save power consumption, the MS needs to

measure the receive level of all the carrier frequencies contained in the BA1 list when decoding themessages on the paging subchannel. At the same time, the MS can obtain the BCCH carrier frequenciescontained in the BA1 list and some receive level measurement samples of the BCCH carrier frequencyof the serving cell.

The MS also performs routine measurements on the BCCH carrier frequency of the serving cell. The MSneeds to attempt to decode all the system information that is broadcast on the BCCH of the serving cellat least every 30 seconds. The MS needs to decode the data blocks transmitted over the BCCH carrier frequencies of the six strongest neighboring cells at least every five minutes. The data blocks contain theparameters that affect cell reselection. When the MS finds that a new BCCH carrier frequency becomesone of the six strongest BCCH carrier frequencies, it needs to decode the data blocks transmitted over the new BCCH carrier frequency within 30 seconds. The MS also needs to check the Base StationIdentity Code (BSIC) of each of the six strongest neighboring cells at least every 30 seconds to ensurethat the same cells are being monitored. If another BSIC is detected, the MS considers that the BCCHcarrier frequency is a new one. In this case, the MS decodes the data blocks transmitted over this BCCHcarrier frequency. In all the preceding conditions, the MS attempts not to interrupt the monitoring of thePCH.

3.4.2 Conditions for Triggering Cell ReselectionCell reselection is triggered if any of the following conditions is met:

The C2 value of a certain cell (located in the same location area as the serving cell) is greater than theC2 value of the serving cell for five consecutive seconds.


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The C2 value of a certain cell (not located in the same location area as the serving cell) is greater thanthe sum of the C2 value of the serving cell and the value of CR H for five consecutive seconds. If a cellreselection was performed 15 seconds earlier, a new cell reselection is not triggered.

The serving cell is barred or the serving cell is temporarily barred because of an authentication failure.

The MS detects a downlink signaling failure.The occurrence of a downlink signaling failure is controlled by the downlink signaling failure counter.When the MS selects a cell, the counter is initialized to the integer nearest to 90 divided byBSAGBLKSRES . The counter is increased by one each time the MS successfully decodes amessage on its paging subchannel. This counter is decreased by four each time the MS fails todecode a message on its paging subchannel. When the counter becomes zero, it indicates that adownlink signaling failure occurs.

For details about the paging subchannel, see 3.7.2 CCCH Configuration and Paging Group Calculation.

The C1 value of the serving cell is less than 0 for five consecutive seconds. The number of random access attempts exceeds MSMAXRETRAN .

3.4.3 Cell Reselection AlgorithmsWhen the cell reselection conditions are met, the MS selects one neighboring cell as the serving cell.

Cell reselection adopts the C2 algorithm. C2 is calculated as follows:

If CELL_RESELECT_PENALTY_TIME is not equal to 31,C2 = C1 + CELL_RESELECT_OFFSET CELL_RESELECT_TEMPORARY_OFFSET xH(CELL_RESELECT_PENALTY_TIME T)

If CELL_RESELECT_PENALTY_TIME is equal to 31,C2 = C1 - CELL_RESELECT_OFFSET

The function H(x) is defined as follows:

If X > 0, H(x) = 0. If X 0, H(x) = 1.

The parameters in the formula are described as follows:

CELL_RESELECT_PENALTY_TIME indicates PT . In scenarios such as areas along highways, PT must be properly set to avoid frequent cellreselections.

T is a timer and its initial value is 0.

When a cell is recorded as one of the six strongest neighboring cells, timer T of the cell is started.When the cell is removed from the list of the six strongest neighboring cells, timer T is reset. CELL_RESELECT_OFFSET indicates CRO . The C2 value can be manually adjusted by setting CRO .

CELL_RESELECT_TEMPORARY_OFFSET indicates TO . During the period between the time when timer T is started and the time when the value of timer Treaches PT , a negative correction value is applied to C2 based on TO . This prevents a fast moving MS from selecting a micro cell or a small-coverage cell as the serving cell.If PT elapses, TO is no longer considered.

The preceding three parameters of the C2 algorithm take effect only when PI is set to YES. Otherwise, the values of theseparameters are regarded as zero. Then, C2 is equal to C1.
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The MS selects a cell to camp on according to the cell reselection priority and C2. The selected cellbecomes the serving cell. As shown in Figure 3-3 , if the two cells have the same cell reselection priorityand the reselection hysteresis and the reselection time meet the specified requirements, the MS selectsCell2, the one with greater C2, as the serving cell.

Figure 3-3 Cell reselection

Cell2Cell1

C2=4 C2=18

For details about the cell reselection priority, see Table 3-1 .

3.5 Location Area UpdateThis section describes the feature GBFD-110301 Location Updating.

3.5.1 OverviewWhen an MS moves from one location area to another, it must register the new location information onthe network. That is, when the MS finds that the LAI stored in the SIM is different from the LAI of theserving cell, it must notify the network to update the stored location area information about the MS. Thisprocedure is called location area update.

An LAI consists of mobile country code (MCC), mobile network code (MNC), and location area code (LAC).

MCC is specified by th e MC C parameter.

MNC is specified by the MN C parameter.

LAC is specified by the LA C parameter.

If cell reselection occurs when an MS in idle mode moves in the same location area, the MS does notnotify the network of the cell change. If the two cells before and after cell reselection belong to differentlocation areas, the MS needs to notify the network of the cell change, and this is called "forcedregistration" in mobile communication.

According to the identifier of location area update, location area updates are classified into three types:normal location area update, IMSI attach/detach, and periodic location area update.

The location area update procedures for normal location area update, periodic location area update, andIMSI attach are basically the same, as shown in Figure 3-4 .
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Figure 3-4 Location area update

MS BTS MSCBSC

RACH

Immediate Assignment Procedure

ChannelRequest(1)

Establish Indication(Location Update Request)(2) CR(Complete

Layer3 Information)

CC(3)LocationUpdationg Accepted(4)

SDCCH

SDCCH

LocationUpdationg Rejected(5)

SDCCH

TMSIReallocation Complete(6)

Clear Command(7)

Clear Complete(7)

In an immediate assignment procedure, the MS sends the BTS a Channel Request message through the RACH,indicating the access cause "location update."

1. When the MS initiates a location area update request, an immediate assignment procedure is started.The BTS sends the BSC an Establish Indication message, which contains the content of the LocationUpdating Request message.

2. The BSC establishes an SCCP link over the A interface. Then, the BSC sends the MSC a CompleteLayer3 Information message, which contains the cell global identity (CGI) of the current cell.

3. The MSC responds to the BSC with a Connection Confirm message.4. The MSC sends the MS a Location Updating Accepted message, indicating that the location area

update is successful.5. If the network rejects the location area update request, it sends a Location Updating Rejected

message to the MS.6. If the TMSI allocation in the case of location area update is enabled on the MSC side, a TMSI

Reallocation Complete message is sent to the MSC in the location area update procedure.7. The MSC sends the BSC a Clear Command message to start the resource release procedure on the

network side.

3.5.2 Location AreaTo determine the location of an MS, the coverage area of each GSM PLMN is divided into multiplelocation areas. Each location area contains one or more cells. The network stores the location areainformation about each MS for paging. After receiving an incoming call, the network pages the MS in the

corresponding location area instead of in all the cells controlled by the MSC. Each location area is


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identified by a location area identity (LAI), which is broadcast through the system information over theBCH.

The sizes of location areas are key factors that determine the system performance. Location areas haveto be properly divided during network planning.

If the size of a location area is too small, more location area updates will take place. This increases thesignaling load.

If the size of a location area is too large, a paging message will be sent in all the cells under thelocation area when the network pages an MS. This increases the load on the PCH and the signalingload on the Abis interface.

Therefore, the planning of location areas is an important task. During division of location areas, ensurethat location area updates are reduced to a smallest possible number without causing heavy paging load.This is to prevent a wastage of network resources.

3.5.3 Normal Location Area Update

When an MS moves from one location area to another, it initiates a normal location area update. Anormal location area update is used to update the location information registered on the network by theMS. The Location Update Type information element in the Location Update Request message shouldindicate that it is a normal location area update.

3.5.4 IMSI Attach/DetachThis section describes the feature GBFD-110302 IMSI Detach.

The IMSI attach/detach procedure informs the MSC/VLR whether the MS can be reached.

The AT T parameter controls whether the network needs to be notified of IMSI attach/detach.

If ATT is set to YES, the MS sends a Location Updating Request (IMSI Attach) message to thenetwork when it is switched on, indicating that the MS is active. After receiving the message, thenetwork updates the state of the MS so that the network can page the MS as required.

If AT T is set to YES, the MS sends an IMSI Detach message to the network when it is switched off,indicating that the MS is inactive. After receiving this message, the network will not send pagingmessages to the MS, saving network resources.

3.5.5 Periodic Location Area UpdateWhen any of the following conditions occurs, the MS loses contact with the network. If the MS is pagedin this case, the network sends a paging message to the location area registered by the MS. The pagingexpires definitely and the system resource is used ineffectively.

When the MS is switched on and moves to a coverage hole, the network cannot know the current stateof the MS but still considers that the MS is attached.

When the MS sends an IMSI Detach message to the network, the network may not correctly decodethe message due to poor uplink quality. As a result, the network still considers that the MS is attached.

When the MS is down accidentally, it loses contact with the network.

To solve these problems, the GSM system implements a certain mechanism, which instructs the MS toautomatically report its location information to the network at regular intervals. The mechanism is calledperiodic location area update. By adopting this mechanism, the network can know in time whether thestatus of the MS has changed.
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Periodic location area update is used to periodically notify the network of the MS availability. When theMS sends a Location Update Request message to the network, the Location Update Type informationelement in the message indicates that it is a periodic location update.

The network sends the periodic location update timer value to all the MSs in the cell through the system

information over the BCCH. The value is specified by T3212 . When this timer expires, the MSautomatically sends a location area update request to the network. After the MS performs a cell selectionor reselection, it reads T3212 from the system information of the serving cell, starts this timer, and storesthe timer on the SIM. When the MS detects that T3212 expires, it automatically sends a location areaupdate request to the network.

The signaling procedure of a periodic location area update is the same as the signaling procedure of anormal location area update.

3.6 Control ChannelsThe control channels for the MS in idle mode include broadcast channels and Common ControlChannels (CCCHs).

The Dedicated Control Channels (DCCHs) are used for the MS in dedicated mode and are not described in thisdocument.

Broadcast Channels

Broadcast channels, including Frequency Correction Channel (FCCH), Synchronization Channel (SCH),Broadcast Control Channel (BCCH), and Cell Broadcast Channel (CBCH), are all downlink channelsused for sending broadcast messages to the MS.

FCCHThe network sends frequency correction signals over the FCCH to the MS. The FCCH enables the MSto synchronize its frequency (with a specified frequency).

SCHThe network sends the frame synchronization number and base station identity code over the SCH tothe MS.

BCCHThe network sends the common messages related to all its cells over the BCCH to the MS.

CBCHThe network broadcasts services over the CBCH within a cell. The physical channels used by theCBCH are the same as those used by the SDCCH.

CCCHsThe CCCHs include Paging Channel (PCH), Random Access Channel (RACH), Access Grant Channel(AGCH), and Notification Channel (NCH).

PCHThe PCH is a downlink channel. The MS monitors the PCH at certain intervals to determine whether itcan receive a call from the MSC.

RACHThe RACH is an uplink channel. The MS accesses the network through the RACH and requests thenetwork to assign an SDCCH.

AGCH
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The AGCH is a downlink channel. The network notifies the MS of the assigned dedicated channel(SDCCH or TCH) through the AGCH.

NCHThe NCH is a downlink channel, which is used to notify the MS of Voice Group Call Service (VGCS)

and Voice Broadcast Service (VBS) calls.

3.7 PagingThis section describes the feature GBFD-110303 CS Paging.

3.7.1 OverviewThrough the paging process, an MS is instructed to access the network to complete call connection.Different paging algorithms have different paging efficiencies. Huawei GBSS paging algorithm has thefollowing benefits:

Paging capability is one of the criteria that measure the system performance. Huawei GBSS pagingalgorithm maximizes the paging capability of the system, while maintaining paging efficiency andminimizing paging load.

Through reliable paging, Huawei GBSS paging algorithm enables MSs to receive every possible call.This reduces customer complaints and improves customer satisfaction.

3.7.2 CCCH Configuration and Paging Group CalculationIn the GSM system, the MS reads the information on the CCCH of the serving cell at least once in every30s. In the downlink, the CCCHs include AGCH and PCH. One CCCH can be carried on one or morephysical channels. In the case of high paging traffic in a location area, one physical timeslot for pagingmessage transmission is insufficient. The GSM protocol allows multiple CCCHs to be configured on oneTRX carrying the BCCH. The CCCHs can be configured only on timeslot 0, 2, 4, or 6.

The number of CCCH message blocks in a cell reflects the resources that can be used by the AGCH or the PCH in the cell. Table 3-2 lists the mapping between the CCCH configuration and the number of CCCH message blocks in a BCCH multiframe.

Table 3-2 Mapping between the CCCH configuration and the number of CCCH message blocks in a BCCHmultiframe

CCCH ConfigurationNumber of CCCH Message Blocks in a BCCHMultiframe

The CCCH uses one physicalchannel exclusively. It does notshare this physical channel with theSDCCH.

9

The CCCH uses one physicalchannel. It shares this physicalchannel with the SDCCH.

3

The CCCH uses two physicalchannels exclusively. It does notshare these physical channels withthe SDCCH.

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CCCH ConfigurationNumber of CCCH Message Blocks in a BCCHMultiframe

The CCCH uses three physicalchannels exclusively. It does notshare these physical channels withthe SDCCH.

27

The CCCH uses four physicalchannels exclusively. It does notshare these physical channels withthe SDCCH.

36

In different CCCH configurations, each BCCH multi-frame (containing 51 frames) includes differentnumbers of CCCH message blocks. The CCCH is shared by the AGCH and the PCH. When messagesneed to be transmitted on both the PCH and the AGCH, the network prefers the PCH. To prevent theoccurrence of message congestion on the AGCH when the traffic on the PCH is high, the networkreserves a certain number of message blocks for the AGCH. The BSAGBLKSRES parameter specifiesthe number of message blocks reserved for messages on the AGCH of the CCCH in a BCCHmulti-frame.

Each MS (corresponding to an IMSI) belongs to a paging group. Each paging group corresponds to apaging subchannel in a cell. The MS determines its paging group based on its IMSI, and then determinesthe location of the paging subchannel of its paging group. In the actual network, the MS listens to only itspaging subchannel but ignores other paging subchannels. When other paging subchannels are used,part of the MS is even powered off to save power overhead (which is the power supply to the DRX). TheBSPAMFRAMS parameter specifies the number of BCCH multi-frames that form a cycle for the pagingsubchannels. This parameter determines the number of paging subchannels into which paging channels

in a cell are divided.The formula for calculating the number of paging groups is:

When the CCCH and the SDCCH share one physical channel, the number of paging groups = (3 -BSAGBLKSRES ) x BSPAMFRAMS .

When the CCCH and the SDCCH do not share one physical channel, the number of paging groups =(9 - BSAGBLKSRES ) x BSPAMFRAMS .

The formula for calculating the paging group mapped to the MS is:

Paging group number = ((IMSI mod 1000) mod (Number of cell paging groups)) div BSPAMFRAMS

For PS services, if the parameter SPGCCCCHSUP is enabled, the formula for calculating paging groups may bedifferent.

The MS determines the mapped paging group based on the IMSI and the configuration of pagingchannels in the serving cell, and then determines the paging subchannel of the mapped paging group.

3.7.3 CS PagingCS paging messages are transmitted on the PCH. When a call reaches the MSC of the called MS, theMSC determines the area where the MS is located and broadcasts paging messages to all the BSCs inthis area. Based on the location area, the BSC determines the cells to which paging messages are sentand performs IMSI-based calculation of the paging group mapped to the MS.
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The MS in idle mode listens to its paging subchannels. If the IMSI or TMSI contained in the PagingRequest message is consistent with its own IMSI or TMSI, the MS sends a Channel Request messageto trigger an initial channel assignment procedure, and sends a Paging Response on the assignedchannel.

The MSC determines whether to use TMSI-based or IMSI-based paging. If IMSI-based paging is used, the paging message contains the IMSI only. If TMSI-based paging is used, the paging message contains both TMSI and IMSI. The IMSI is used by the BSC to

calculate paging groups.

3.7.4 PS PagingThe PS paging procedure is similar to the CS paging procedure. During the PS paging procedure, thefunction of the SGSN is similar to that of the MSC. The paging strategy of the SGSN determines whether the P-TMSI or IMSI is used for paging. The SGSN initiates PS paging when transmitting downlink data toan MS. PS paging messages are carried on the PS paging channels (if configured) or on the PCHs if the

PS paging channels are not configured.Only the MS in the STANDBY state can be paged. The SGSN obtains the RA of the MS and sends apaging message to the entire RA .

The location information of the MS in the STANDBY state contains only the RA information of the GPRS.

3.7.5 Paging ModesHuawei GBSS supports the following standard paging modes:

Common paging mode

The MS calculates the mapped paging group based on the IMSI and the configuration of pagingchannels in the serving cell, and then calculates the paging subchannel of the mapped paging group.Paging messages are sent on only this paging subchannel.

Complete paging modeWhen an MS group is informed that it is in complete paging mode, paging messages of this group maybe sent on any PCH of the same timeslot. When the PCH configuration dynamically changes, pagingmessage loss can be avoided.

Spaced paging modeThe BSS adds the paging messages of a group to another paging channel to avoid temporaryoverload. That is, the MS can receive paging messages on paging channel N+2 in spaced pagingmode, whereas it receives paging messages on paging channel N in common paging mode.

3.7.6 Paging FunctionsHuawei GBSS supports the paging queue, paging retransmission, paging combination, and paging flowcontrol functions. These functions can effectively improve and guarantee the paging capacity of theBSC.

Paging queueThe transmission of paging messages on the Um interface is limited by paging groups. The pagingmessages of a paging group can be transmitted only on the message blocks to which the paginggroup is mapped. The BTS implements the paging queue function to wait for opportunities for transmission by temporarily buffering the paging messages received from the BSC. The BTS selects a
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paging message and transmits it on the corresponding message block whenever an opportunitycomes. Paging messages of the same priority follow the rule of "first come, first served (FCFS)."To guarantee the scheduling efficiency for paging messages on the Um interface, thePAGINGLIFETIME parameter specifies the life cycle of a paging queue in the BTS. The setting of this

parameter must be consistent with the setting of the paging timer T3113 of the core network. It isrecommended that the PAGINGLIFETIME parameter be set to a value that is 1s to 2s shorter thanT3113.

Paging retransmission As the message on the downlink CCCH is transferred in unacknowledged mode on the LAPDm layer of the Um interface, there is a risk of message loss. Paging retransmission is used to reduce this risk.Generally, the MSC and BSS provide two levels of retransmission. One level is at the MSC, wherepaging messages are retransmitted in a long period to handle long interruptions. The other level is atthe BTS, where paging messages are retransmitted in a short time and traffic flow on the Abis and Ainterfaces can be reduced. Huawei BSS supports the paging retransmission function. When themessage block has neither paging messages nor immediate assignment messages to be transmitted,the paging messages that have been transmitted on this message block will be retransmitted. Themaximum number of paging retransmissions of the same message is specified by the PAGTIMES parameter.Paging messages on the MSC side are retransmitted at a fixed interval and the paging retransmissionis controlled by the parameters on the MSC side. The paging retransmission on the BTS side isimplemented by the PAGTIMES parameter. Paging messages on the BTS side are not retransmittedat a fixed interval but scheduled in the paging queues for retransmission. The paging queues for retransmission have lower priority than normal paging queues.Maximum number of paging message transmissions on the Um interface = Number of pagingsconfigured on the MSC side x PAGTIMES configured on the BTS side.

Paging combinationPaging combination is used to improve the utilization of the Um interface. The Paging Commandmessage sent from the BSC to the BTS contains the information of an MS. The BTS tries to combineall the Paging Command messages of the MSs belonging to the same paging group, and sends withthe Paging Request messages to the MSs. One Paging Request message contains the TMSIs or IMSIs of multiple MSs. One TMSI consists of 3 digits, and one IMSI consists of 15 digits. The length of the Paging Request message is limited. The combination capability depends on whether the combinedpaging commands use the IMSI-based or TMSI-based paging. The MS determines whether torespond to the paging request by resolving the Mobile Identity field (including the TMSI or IMSI) in thePaging Request message.The protocols specify three paging request types. Their combination modes are as follows: Paging request type 1

One Paging Request message combines one to two Paging Command messages. IMSI IMSI+IMSI IMSI+TMSI/P TMSI/P TMSI/P+TMSI/P Paging request type 2

One Paging Request message combines two to three Paging Command messages. TMSI/P+TMSI/P TMSI/P+TMSI/P+IMSI

TMSI/P+TMSI/P+TMSI/P
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Contents

Table 3-3 lists the contents of System Information Type 1.

Table 3-3 Contents of System Information Type 1

Type Content

SYS INFO 1 Cell Channel Desc

RACH Control Para.

SI 1 Rest Octets

The contents of System Information Type 1 are described as follows:

CA list

One cell can be configured with a maximum of 64 frequencies. The actual configuration of cellfrequencies is subject to the Cell Channel Description, as listed in Table 3-4 . The BSC selects a formatof cell channel description based on the actual configuration of cell frequencies.The format of cell channel description is defined by octet 2, Format ID (Bit 128, Bit 127, Bit 124, Bit123, and Bit 122), as listed in Table 3-5 .

Table 3-4 Format of cell channel description

8 7 6 5 4 3 2 1

Cell Channel Description IEI octet 1

Bit Bit 0 0 Bit Bit Bit Bit

octet 2128 127 Spare Spare 124 123 122 121

Bit Bit Bit Bit Bit Bit Bit Bitoctet 3

120 119 118 117 116 115 114 113

Bit Bit Bit Bit Bit Bit Bit Bitoctet 17

8 7 6 5 4 3 2 1

Table 3-5 Format of cell channel description

Bit128 Bit127 Bit124 Bit123 Bit122 FormatNotation

0 0 X X X bit map 0

1 0 0 X X 1024 range

1 0 1 0 0 512 range

1 0 1 0 1 256 range

1 0 1 1 0 128 range


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Bit128 Bit127 Bit124 Bit123 Bit122 FormatNotation

1 0 1 1 1 variable bitmap

Different formats of cell channel description correspond to different numbers of available cellfrequencies. Assume that the number of available frequencies for a cell is n (except for duplicate andinvalid frequencies) and ARFCN(i) (i=1,,n) represents the Absolute Radio Frequency ChannelNumber. Then, the numbers of available frequencies for different formats of cell channel descriptionare as follows: Bit map 0

The bit map 0 format is used for GSM900 frequencies. The number of available frequencies is 64 if 1 ARFCN(i) 124.

1024 rangeIf the 1024 range format is used, the number of available frequencies for a cell is equal to or smaller than 16. For a GSM900 cell, 1 ARFCN(i) 124. For a GSM1800 cell, 512 ARFCN(i) 885.

512 rangeIf the 512 range format is used, the number of available frequencies for a cell is equal to or smaller than 18. The interval between any two ARFCNs must be less than 512.

256 rangeIf the 256 range format is used, the number of available frequencies for a cell is equal to or smaller than 22. The interval between any two ARFCNs must be less than 256. For example, in the 256range format, ARFCNs 512 and 812 cannot be configured simultaneously.

128 rangeIf the 128 range format is used, the number of available frequencies for a cell is equal to or smaller than 29. The interval between any two ARFCNs must be less than 128. For example, in the 128range format, ARFCNs 512 and 712 cannot be configured simultaneously.

Variable bit mapIf the variable bit map format is used, the number of available frequencies for a cell is equal to or smaller than 64. The interval between any two ARFCNs must range from 1 to 111. For example, inthe variable bit map format, it is allowed to configure 64 frequencies with the ARFCNs 512 to 575with an increment of 1, but it is not allowed to configure 64 frequencies with the ARFCNs 512 to 638with an increment of 2.

The previously mentioned restrictions are mainly applied to GSM1800 frequencies. RACH Control Para.The RACH Control Para. information element contains the following parameters: MSMAXRETRAN TX CELLBARACCESS2 COMMACC and SPECACC

The access control class is categorized into classes 0-9 and 11-15. Generally, each GSM MS has anaccess class, represented by a bit. If this bit is set to 1, MSs of the corresponding class are barredfrom accessing the current cell. Otherwise, they are allowed to access the cell.

CALLRESTABDIS
http://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellccbasic_msmaxretran.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellccbasic_msmaxretran.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellccbasic_msmaxretran.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellidlebasic_tx.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellidlebasic_tx.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellidlebasic_tx.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellservpara_cellbaraccess2.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellservpara_cellbaraccess2.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellservpara_cellbaraccess2.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellccbasic_commacc.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellccbasic_commacc.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellccbasic_commacc.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellccbasic_specacc.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellccbasic_specacc.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellccbasic_specacc.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellbasicpara_callrestabdis.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellbasicpara_callrestabdis.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellbasicpara_callrestabdis.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellbasicpara_callrestabdis.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellccbasic_specacc.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellccbasic_commacc.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellservpara_cellbaraccess2.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellidlebasic_tx.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellccbasic_msmaxretran.html


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ERGCALLDIS

The time interval between two consecutive Channel Request messages sent by an MS is indicated by a random valuefrom {S, S+1, S+T-1}. The unit of the time interval is TDMA frame. Here, S is subject to the common control channelconfiguration, which is delivered in System Information Type 3; T is TX-integer.

Table 3-6 lists the relationship between S and T.

Table 3-6 Relationship between S and T

TX Non CombinedCCCH Combined CCCH

3, 8, 14, 50 55 41

4, 9, 16 76 52

5, 10, 20 109 58

6, 11, 25 163 86

7, 12, 32 217 115

If satellite transmission is used, it is recommended that MSMAXRETRAN be set to 4 and TX be set to 32 to reduce thedelay caused by satellite transmission.

SI 1 Rest OctetsThe SI 1 Rest Octets information element has eight bits. It contains spare bits and indication of thePCS1900 and DCS1800.

3.8.3 System Information Types 2, 2BIS, 2TER, and 2QUATER

FunctionsThe functions of System Information Types 2, 2BIS, 2TER, and 2QUATER are as follows:

System Information Type 2 is sent on the BCCH to provide information about the RACH control, theNCC Permitted, and the BCCH allocation list (BA1 list) in neighboring cells. Generally, System Information Types 2, 2BIS, and 2TER describe different parts of the BA1 list. The

MS reads and decodes the BA1 list and then performs cell reselection in idle mode. A phase 1 MS in GSM900 recognizes only the neighboring cell frequencies described in System

Information Type 2 and ignores those described in System Information Types 2BIS and 2TER. System Information Type 2BIS is sent on the BCCH to provide information about the RACH controland the extension of the BCCH allocation list in the neighboring cells (part of the BA1 list). System

Information Type 2BIS is optional. Generally, System Information Type 2 carries the information abouta limited number of frequencies that are included in the BA1 list. In this situation, System InformationType 2BIS carries the information about other frequencies that are included in the BA1 list and are onthe same frequency band as the frequencies carried by System Information Type 2.

System Information Type 2TER is sent on the BCCH to provide information about the extension of BCCH allocation list in neighboring cells (part of the BA1 list). System Information Type 2TER carriesthe information about the frequencies that are on different bands from the frequencies of the currentcell. Only the dual-band MSs read System Information Type 2TER. The GSM900 MSs and theGSM1800 MSs ignore this message.

System Information Type 2QUATER provides information about the BCCH allocation in neighboring3G cells. It is used for the reselection of 3G cells. System Information Type 2QUATER is sent wheninter-RAT handover is required and neighboring 3G cells are configured.
http://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellccbasic_ergcalldis.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellccbasic_ergcalldis.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellccbasic_ergcalldis.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellccbasic_msmaxretran.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellccbasic_msmaxretran.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellccbasic_msmaxretran.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellidlebasic_tx.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellidlebasic_tx.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellidlebasic_tx.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellidlebasic_tx.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellccbasic_msmaxretran.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellccbasic_ergcalldis.html


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In a dual-band network, the SENDSI2TERFLAG parameter specifies whether to send SystemInformation Type 2TER. In a non-dual-band network, the SI2TerSwitch parameter specifies whether tosend System Information Type 2TER.

The Send2QuterFlag parameter specifies whether to send System Information Type 2QUATER.

Contents

Table 3-7 lists the contents of System Information Types 2, 2BIS, 2TER, and 2QUATER.

Table 3-7 Contents of System Information Types 2, 2BIS, 2TER, and 2QUATER

Type Content

SYS INFO 2 Neighbor Cell Desc.

NCC permitted

RACH Control Para.

SYS INFO 2 BIS Neighbor Cell Desc.

RACH Control Para.

SYS INFO 2TER Neighbor Cell Desc. (Extended)

SYS INFO 2QUATER SI 2quater Rest Octets

The contents of System Information Types 2, 2BIS, 2TER, and 2QUATER are described as follows:

Neighbor Cell Desc. (BA1 list)

The Neighbor Cell Description information element provides the ARFCNs of the BCCH carriers in theneighboring cells of the current cell. Currently, Huawei BSS supports a maximum of 32 neighboringcells per cell. Except for bit 5 (BA-IND) and bit 6 (EXT-IND) of octet 2, the Neighbor Cell Descriptioninformation element is coded in the same way as the Cell Channel Description information element.For details, see the cell channel description in 3.8.2 System Information Type 1 . The extension indication (EXT_IND) is sent in System Information Types 2 and 5. It indicates whether

extended neighboring cell frequencies are sent in System Information Types 2BIS and 5BIS. It hasone bit. If the EXT_IND bit is set to 0, System Information Types 2 and 5 carry the complete BA list. If the EXT_IND bit is set to 1, System Information Types 2 and 5 carry only part of the BA list.

The BA indication (BA_IND) is sent in System Information Types 2 and 5. It has one bit and is usedby the MS to discriminate changes in the BA1 or BA2 list. In other words, if the neighboring cellrelationship and the BA2 list are modified during the conversation, the BA_IND bit in SystemInformation Type 5 should be 1, indicating that the MS needs to decode the neighboring cellfrequencies again.

NCCPERMITED The NCCPERMITED parameter is sent in System Information Types 2 and 6. It has eight bits andprovides all the NCCs required by MSs. In other words, if bit N is 0 (0 N 7), the MS does notmeasure the power level of the cell where the NCC is N, indicating that the MS is not reselected or handed over to the network where the NCC is N. This parameter is mainly used for handover and cellreselection.

RACH Control Para.For details about the RACH Control Para. information element, see 3.8.2 System Information Type 1 .

Neighbor Cell Desc. (Extended)
http://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/othsoftpara_sendsi2terflag.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/othsoftpara_sendsi2terflag.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/othsoftpara_sendsi2terflag.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/othsoftpara_si2terswitch.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/othsoftpara_si2terswitch.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/othsoftpara_si2terswitch.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/othsoftpara_send2quterflag.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/othsoftpara_send2quterflag.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/othsoftpara_send2quterflag.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellextmsrpara_nccpermited.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellextmsrpara_nccpermited.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellextmsrpara_nccpermited.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellextmsrpara_nccpermited.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellextmsrpara_nccpermited.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellextmsrpara_nccpermited.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellextmsrpara_nccpermited.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/othsoftpara_send2quterflag.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/othsoftpara_si2terswitch.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/othsoftpara_sendsi2terflag.html


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The Neighbor Cell Desc. (Extended) information element is sent in System Information Types 2TERand 5TER. Except for bit 5 (BA-IND) and bits 6 and 7 (Multi-band report) of octet 2, this informationelement is coded in the same way as the Cell Channel Description information element. For details,see 3.8.2 System Information Type 1 .

MB R The MB R parameter is sent in System Information Types 2TER and 5TER. It has two bits and is usedto request the dual-band MS to report information about neighboring cells of multiple bands. For details, see Table 3-8 .

Table 3-8 Multiband reporting

Multiband Reporting (TwoBits)

Meaning

0 The MS reports the measurement results of the top sixneighboring cells where the signal strength is thestrongest, irrespective of the band used.

1 If there is a neighboring cell that is on a different bandfrom the serving cell and if the MS is allowed to campon the neighboring cell, the MS reports themeasurement results of the neighboring cell. At theother five positions, it reports the measurement resultsof the neighboring cells that are on the same band asthe serving cell.

10 If there are two neighboring cells that are on a differentband from the serving cell and if the MS is allowed tocamp on the neighboring cells, the MS reports themeasurement results of the two neighboring cells. At

the other four positions, it reports the measurementresults of the neighboring cells that are on the sameband as the serving cell.

11 If there are three neighboring cells that are on adifferent band from the serving cell and if the MS isallowed to camp on the neighboring cells, the MSreports the measurement results of the threeneighboring cells. At the other three positions, it reportsthe measurement results of the neighboring cells thatare on the same band as the serving cell.

SI 2quater Rest OctetsThe SI 2quater Rest Octets information element contains the following parameters: BA_IND 3G_BA_IND MP_CHANGE_MARK 3G Neighbour Cell Description Index_Start_3G UTRAN FDD DESCRIPTION UTRAN TDD DESCRIPTION
http://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellccbasic_mbr.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellccbasic_mbr.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellccbasic_mbr.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellccbasic_mbr.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellccbasic_mbr.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellccbasic_mbr.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellccbasic_mbr.html


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3G MEASUREMENT PARAMETERS Description

These parameters belong to the parameters related to external 3G cells.

3.8.4 System Information Type 3

Functions

System Information Type 3 is sent on the BCCH to provide information about the location area identity,cell identity, RACH control, and parameters related to cell selection. The information is mandatory.

Contents

Table 3-9 lists the contents of System Information Type 3.

Table 3-9 Contents of System Information Type 3

Type Content

SYS INFO 3 Cell Identity

LAI

Cell Option (BCCH)

Cell Selection Para.

RACH Control Para.

SI 3 Rest Octets

The contents of System Information Type 3 are described as follows: CGIThe Cell Global Identity (CGI) consists of the Location Area Identity (LAI) and the CI . The LAI consistsof the MCC , MN C , and LA C . System Information Types 3, 4, and 6 contain all or part of the CGI. Uponreceiving the system information, the MS decodes the CGI. Based on the MCC and the MNC, the MSdetermines whether to access the network through this cell and whether the current location area haschanged. If the location area has changed, the MS initiates a location area update procedure.

Control Channel DescThe Control Channel Desc information element contains the following parameters: MSCVER

The MSC Version Indication parameter indicates when the MSC was released. This parameter hasone bit. If the bit is set to 0, the MSC was released in 1998 or earlier. If the bit is set to 1, the MSCwas released in 1999 or later.

AT T CCCH-CONF

The CCCH-CONF parameter determines the combination mode of the CCCH. The CCCH-CONFhas three bits. Table 3-10 describes the meaning of the CCCH-CONF.
http://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcell_ci.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcell_ci.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcell_ci.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcell_mcc.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcell_mcc.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcell_mcc.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcell_mnc.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcell_mnc.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcell_mnc.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcell_lac.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcell_lac.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcell_lac.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellccutransys_mscver.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellccutransys_mscver.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellccutransys_mscver.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellidlebasic_att.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellidlebasic_att.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellidlebasic_att.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellidlebasic_att.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcellccutransys_mscver.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcell_lac.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcell_mnc.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcell_mcc.htmlhttp://localhost/var/www/apps/conversion/tmp/RNCParaHtml/mbsc/m-para/gcell_ci.html


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Table 3-10 Meaning of the CCCH-CONF

CCCH-CONF (ThreeBits)

Number of CCCHMessage Blocks in aBCCH Multiframe

Meaning

000 9 One physical channel used for CCCH, not shared with SDCCHs

001 3 One physical channel used for CCCH, shared with SDCCHs

010 18 Two physical channels used for CCCH, not shared with SDCCHs

100 27 Three physical channels used for CCCH, not shared with SDCCHs

110 36 Four physical channels used for CCCH, not shared with SDCCHs

Others - Reserved

BSAGBLKSRES BSPAMFRAMS T3212

Cell Option (BCCH)The Cell Option (BCCH) information element contains the following parameters:

CANPC FRULDTX RL T

Cell Selection Para.The Cell Selection Para. information element affects the behaviors of an MS after the MS is switchedon. It contains the following parameters: CR H FMSMAXOPCC RXMIN A CS

The A CS parameter indicates whether the MS uses C2 during cell reselection. It has one bit. InSystem Information Type 3, this parameter is meaningless. In System Information Type 4, value 0 of the bit indicates that the SI4 Rest Oct of System Information Type 4 is used to calculate theparameters related to C2; value 1 indicates that the SI4 Rest Oct of System Information Types 7 and8 are used to calculate the parameters related to C2.

HRATESPT RACH Control Para.For details, see 3.8.2 System Information Type 1 .

SI 3 Rest OctetsThe SI 3 Rest Octets information element contains the following parameters: PI
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Issue 01 (2012-04-28) Huawei Proprietary and ConfidentialCopyr

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