11-Bit Egprs Access(Gbss15.0_01)

GSM BSSGBSS15.0

11-Bit EGPRS Access FeatureParameter Description

Issue 01Date 2013-05-06

HUAWEI TECHNOLOGIES CO., LTD.

Copyright Huawei Technologies Co., Ltd. 2013. All rights reserved.No part of this document may be reproduced or transmitted in any form or by any means without prior writtenconsent of Huawei Technologies Co., Ltd. Trademarks and Permissions

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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 a warranty of any kind, express or implied. Huawei Technologies Co., Ltd.Address: Huawei Industrial Base

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Website: http://www.huawei.comEmail: [email protected]

Issue 01 (2013-05-06) Huawei Proprietary and ConfidentialCopyright Huawei Technologies Co., Ltd.

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Contents

1 About This Document..................................................................................................................11.1 Scope..............................................................................................................................................................................11.2 Intended Audience..........................................................................................................................................................11.3 Change History...............................................................................................................................................................12 Overview.........................................................................................................................................32.1 Introduction....................................................................................................................................................................32.2 Feature Support by NE...................................................................................................................................................33 Technical Description...................................................................................................................43.1 One-Phase Packet Access on the Uplink CCCH............................................................................................................53.2 One-Phase Packet Access on the Uplink PCCCH..........................................................................................................74 Related Features.............................................................................................................................85 Impact on the Network.................................................................................................................95.1 Impact on System Capacity............................................................................................................................................95.2 Impact on Network Performance....................................................................................................................................96 Engineering Guidelines.............................................................................................................106.1 When to Use 11-Bit EGPRS Access............................................................................................................................106.2 Network Planning.........................................................................................................................................................106.2.1 RF Planning...............................................................................................................................................................106.2.2 Network Topology.....................................................................................................................................................106.2.3 Hardware Planning....................................................................................................................................................106.3 Deploying 11-Bit EGPRS Access................................................................................................................................106.3.1 Deployment Requirements........................................................................................................................................106.3.2 Data Preparation........................................................................................................................................................116.3.3 Feature Activation.....................................................................................................................................................126.3.4 Activation Observation..............................................................................................................................................146.3.5 Deactivation...............................................................................................................................................................146.4 Monitoring....................................................................................................................................................................166.5 Parameter Optimization................................................................................................................................................166.6 Troubleshooting............................................................................................................................................................167 Parameters.....................................................................................................................................178 Counters........................................................................................................................................20

GSM BSS11-Bit EGPRS Access Feature Parameter Description Contents


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9 Glossary.........................................................................................................................................2110 Reference Documents...............................................................................................................22

GSM BSS11-Bit EGPRS Access Feature Parameter Description Contents


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1 About This Document1.1 Scope

This document describes the GBFD-119201 11-Bit EGPRS Access feature.

1.2 Intended AudienceThis document is intended for:l Personnel who need to understand the 11-Bit EGPRS Access featurel Personnel who work with Huawei GPRS products

1.3 Change HistoryThis section provides information about the changes in different document versions.There are two types of changes, which are defined as follows:l Feature change: refers to a change in the 11-Bit EGPRS Access feature of a specific product

version.l Editorial change: refers to a change in wording or the addition of information that was not

described in the earlier version.

Document IssuesThe document issue is as follows:l 01 (2013-05-06)l Draft A (2013-02-27)

01 (2013-05-06)This is the first commercial release of GBSS15.0.Compared with Draft A (2013-02-27), Issue 01 (2013-05-06) has no change.

GSM BSS11-Bit EGPRS Access Feature Parameter Description 1 About This Document


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Draft A (2013-02-27)This is a draft.Compared with issue 01 (2012-04-28) of GBSS14.0, draft A (2013-02-27) of GBSS15.0incorporates the changes described in the following table.

Change Type Change Description Parameter ChangeFeature change Added descriptions about

enhancements in the 11-BitEGPRS Access feature. Fordetails, see section 3.1 One-Phase Packet Access on theUplink CCCH.

Added the AccTechReqSw(GSM BSC6900,GSMBSC6910) parameter.

Editorial change Separated the GBFD-11920111-Bit EGPRS Accessfeature from GPRS/EGPRSConnection Control andTransfer Feature ParameterDescription and optimizedthe descriptions.

None

GSM BSS11-Bit EGPRS Access Feature Parameter Description 1 About This Document


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2 Overview2.1 Introduction

The Packet Channel Request message is an 8-bit or 11-bit access burst. The 11-Bit EGPRSAccess feature enables the BSC to allocate channel resources to an MS upon receiving the accessrequest so that the MS can have immediate access to services with only a short delay. In addition,this feature optimizes the procedure for 11-bit one-phase packet access on the uplink commoncontrol channel (CCCH) so that the BSC can obtain the capability of an MS to support theExtended Uplink TBF feature. If the MS supports the Extended Uplink TBF feature, the uplinkdata transfer uses established temporary block flows (TBFs). This eliminates the need toestablish new TBFs and shortens the GPRS mobility management (GMM) access delay.

2.2 Feature Support by NETable 2-1 Feature support by NE

Feature BSC6900 BSC6910 GBTS eGBTS11-Bit EGPRSAccess

NOTE

indicates that the NE supports this feature. indicates that the NE does not support this feature.

GSM BSS11-Bit EGPRS Access Feature Parameter Description 2 Overview


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3 Technical DescriptionThis chapter describes the establishment of an uplink TBF.Before transmitting data, an MS initiates a channel request. The packet switched (PS) channelrequest is of the following types: one-phase access and two-phase access.l For a one-phase access request, the BSC allocates radio resources to an MS upon receiving

the request. The radio resources can be the temporary flow identity (TFI) or uplink stateflag (USF) resources.

l For a two-phase access request, the processing procedure is as follows:1. The BSC allocates one Radio Link Control (RLC)/Media Access Control (MAC) control

block to an MS. The MS transmits a Packet Resource Request message on the allocatedradio block.

2. The BSC allocates radio resources (such as the TFI or USF) to the MS. The MS then startsto transmit data on the allocated radio resources.

The Packet Channel Request message is an 8-bit or 11-bit access burst, which carries only asmall amount of information. The Packet Resource Request message, however, is an RLC/MACsignaling packet encoded using Coding Scheme 1 (CS-1), which carries more information,including the temporary logical link identifier (TLLI), MS multislot capability, and the radiopriority.One-phase packet access can use the CCCH or the packet common control channel (PCCCH),depending on the channels configured for a cell.

NOTE

The PCCCH is used only if the packet broadcast control channel (PBCCH) is configured for a cell. If noPBCCH is configured, the CCCH is used.

GSM BSS11-Bit EGPRS Access Feature Parameter Description 3 Technical Description


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3.1 One-Phase Packet Access on the Uplink CCCHThis chapter describes the establishment of an uplink TBF.Before transmitting data, an MS initiates a channel request. The packet switched (PS) channelrequest is of the following types: one-phase access and two-phase access.l For a one-phase access request, the BSC allocates radio resources to an MS upon receiving

the request. The radio resources can be the temporary flow identity (TFI) or uplink stateflag (USF) resources.

l For a two-phase access request, the processing procedure is as follows:1. The BSC allocates one Radio Link Control (RLC)/Media Access Control (MAC) control

block to an MS. The MS transmits a Packet Resource Request message on the allocatedradio block.

2. The BSC allocates radio resources (such as the TFI or USF) to the MS. The MS then startsto transmit data on the allocated radio resources.

The Packet Channel Request message is an 8-bit or 11-bit access burst, which carries only asmall amount of information. The Packet Resource Request message, however, is an RLC/MACsignaling packet encoded using Coding Scheme 1 (CS-1), which carries more information,including the temporary logical link identifier (TLLI), MS multislot capability, and the radiopriority.One-phase packet access can use the CCCH or the packet common control channel (PCCCH),depending on the channels configured for a cell.

NOTE

The PCCCH is used only if the packet broadcast control channel (PBCCH) is configured for a cell. If noPBCCH is configured, the CCCH is used.

One-Phase Packet Access on the Uplink CCCHFigure 3-1 shows the procedure for establishing an uplink TBF when one-phase packet accessuses the CCCH.



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Figure 3-1 One-phase packet access on the uplink CCCH

1. If no PCCCH is configured for a cell, an MS in packet idle mode sends a Channel Requestmessage to the BSC over the random access channel (RACH).

2. After receiving the Channel Request message from the MS, the BSC starts to establish aTBF and informs the MS whether the access request is allowed. If the request is allowed,the BSC sends an Immediate Assignment message to the MS over the access grant channel(AGCH). The message contains the USF and the TFI of the TBF and indicates that an uplinkpacket channel has been allocated for the uplink data transfer.

3. If AccTechReqSw(GSM BSC6900,GSM BSC6910) is set to ON(On), the MS sends aPacket Resource Request message that carries its capability to support the Extended UplinkTBF feature to the BSC and the procedure proceeds to 4. If AccTechReqSw(GSMBSC6900,GSM BSC6910) is set to OFF(Off), the procedure proceeds to 5.

4. After receiving the Packet Resource Request message from the MS, the BSC responds witha Packet Uplink Assignment message to allocate channel resources to the MS.

5. The MS sends the first uplink RLC data block, which contains the TLLI of the MS, to theBSC over the allocated uplink packet channel. After receiving the data block, the BSCresponds with a Packet Uplink Ack/Nack message with the TLLI to complete the contentionresolution procedure. The establishment of an uplink TBF is complete.

6. The BSC responds with a Packet Uplink Ack/Nack message without the TLLI toacknowledge the reception of the uplink RLC data block.

EGPRS supports one-phase access and two-phase access. One-phase access and the first phaseof two-phase access can be 8-bit or 11-bit access. The procedure for 11-bit one-phase access on



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the CCCH is the same as that for 8-bit one-phase access on the CCCH. The access speeds aresimilar, but the MS multislot capability can be carried in the procedure for 11-bit one-phaseaccess on the CCCH. Generally, an EGPRS-capable MS has the multislot capability. If anEGPRS-capable MS uses one-phase access, it informs the network of its multislot capabilityduring 11-bit one-phase access. If an EGPRS-capable MS uses two-phase access, it sends aPacket Resource Request message to inform the network of its multislot capability. This prolongsaccess delay. Therefore, the EGPRS11BITCHANREQ(GSM BSC6900,GSM BSC6910)parameter should be set to YES(YES) to ensure that the EGPRS-capable MS uses one-phaseaccess. This shortens the access duration by 300 ms, compared with two-phase access.

3.2 One-Phase Packet Access on the Uplink PCCCHThe basic procedure for one-phase packet access on the uplink PCCCH is nearly the same asthat for one-phase packet access on the uplink CCCH, except for the following differences:l The channel request is initiated over the packet random access channel (PRACH).l Uplink assignment rather than immediate assignment is initiated over the packet access

grant channel (PAGCH).l The procedure optimization controlled by AccTechReqSw(GSM BSC6900,GSM

BSC6910) does not take effect for one-phase packet access on the uplink PCCCH.



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4 Related FeaturesTable 4-1 Related features

Feature PrerequisiteFeature

MutuallyExclusive Feature

Affected Feature

11-Bit EGPRSAccess

l GBFD-114201EGPRS

l GBFD-119203Extended UplinkTBF

None None

GSM BSS11-Bit EGPRS Access Feature Parameter Description 4 Related Features


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5 Impact on the Network5.1 Impact on System Capacity

None

5.2 Impact on Network PerformanceApplying 11-bit one-phase access shortens the access delay for EGPRS-capable MSs.The optimization of the procedure for 11-bit one-phase packet access on the uplink enables theBSC to obtain the capability of an MS to support the Extended Uplink TBF feature in advance.This eliminates the need to establish new TBFs and shortens the GMM access delay. However,the optimization has the following negative impacts:l Prolongs the delay in activating the Packet Data Protocol (PDP) context and the first ping

delayl Prolongs the average duration of uplink TBFsl Decreases the number of assignments on the uplink packet associated control channel

(PACCH)l Increases the call drop rate of uplink TBFsDecreases the portion of uplink services using high-rate coding schemes

GSM BSS11-Bit EGPRS Access Feature Parameter Description 5 Impact on the Network


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6 Engineering Guidelines6.1 When to Use 11-Bit EGPRS Access

It is recommended the 11-Bit EGPRS Access feature be enabled for cells that support EGPRSand have a large portion of EGPRS-capable MSs.

6.2 Network Planning

6.2.1 RF PlanningN/A

6.2.2 Network TopologyN/A

6.2.3 Hardware PlanningN/A

6.3 Deploying 11-Bit EGPRS Access

6.3.1 Deployment RequirementsTable 6-1 Deployment requirements

Aspect RequirementRelated features See 4 Related Features

GSM BSS11-Bit EGPRS Access Feature Parameter Description 6 Engineering Guidelines


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Aspect RequirementBSC l An external PCU is installed if an external

PCU is required.l The BSC is configured with PS service

processing boards and Gb interface boardsif a built-in PCU is required.

BTS NoneGSM networking NoneMS MSs support 11-Bit EGPRS Access.MSC NoneLicense The license controlling this feature has been

activated. For details on how to activate thelicense, see License Management FeatureParameter Description. For details aboutlicense items, see License Control ItemDescription.

Others None

6.3.2 Data PreparationTable 6-2 Data preparation

ParameterName

Parameter ID NE Remarks(Configuration Principle forDifferentScenarios)

Data Source

Support 11BITEGPRS Access

EGPRS11BITCHANREQ

BSC6900/BSC6910

It isrecommendedthis parameterbe set to YES(YES) for cellsthat supportEGPRS andhave a largeportion ofEGPRS-capableMSs.

Networkplanning



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ParameterName

Parameter ID NE Remarks(Configuration Principle forDifferentScenarios)

Data Source

AccessTechnologiesRequest Switch

AccTechReqSw BSC6900/BSC6910

It isrecommendedthat thisparameter be setto ON(On)during delaycompetition.

Networkplanning

Inactive Periodof ExtendedUplink TBF

UPEXTTBFINACTDELAY

BSC6900/BSC6910

It isrecommendedthat thisparameter be setto a value otherthan 0 when theenhanced 11-BitEGPRS Accessfeature isenabled.

Networkplanning

6.3.3 Feature ActivationUsing the LMT

NOTEThe BSC6900 supports both built-in PCUs and external PCUs. The BSC6910 supports only built-in PCUs.

Step 1 Activate the 11-Bit EGPRS access on the CCCH.l When an external PCU is used, run the PCU ADD EGPRSPara command on the PCU

operation maintenance center (OMC) to activate the 11-Bit EGPRS access on the CCCH.l If a built-in PCU is used, perform the following steps on the BSC LMT:1. Run the SET GCELLPSBASE command with Support 11-Bit EGPRS Access set to YES

(YES).2. Run the SET BSCPSSOFTPARA command with Force MS Two-phase Access set to

Close(Close).Step 2 (Optional) Enable the reporting of the radio access (RA) capability during one-phase access.

If a built-in PCU is used, perform the following steps on the BSC LMT:1. Run the SET GCELLPSBASE command with Access Technologies Request Switch set

to ON(On).2. Run the SET GCELLPRIVATEOPTPARA command with Inactive Period of

Extended Uplink TBF set to a value greater than 0.----End



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MML Examples//Activating the 11-Bit EGPRS access on the CCCHSET GCELLPSBASE: IDTYPE=BYID, CELLID=0, EGPRS11BITCHANREQ=YES;

//Disabling forced two-phase accessSET BSCPSSOFTPARA: Force2Phase=Close;

//(Optional) Enabling the reporting of the RA capability during one-phase accessSET GCELLPSBASE: IDTYPE=BYID, CELLID=0, AccTechReqSw=ON;SET GCELLPRIVATEOPTPARA: IDTYPE=BYID, CELLID=0,UPEXTTBFINACTDELAY=2000;

Using the CMENOTE

When configuring the 11-Bit EGPRS Access feature on the CME, you must perform a single configurationfirst, and then perform batch modifications if required.You must perform a single configuration for a parameter before batch modifications of the parameter. Youare advised to perform batch modifications before logging out of the parameter setting interface.

Step 1 Configure a single object on the CME. (CME single configuration)Set parameters on the CME configuration interface according to the operation sequencedescribed in Table 6-3. For the method of performing the CME single configuration, see CMESingle Configuration Operation Guide.

Step 2 Modify objects in batches on the CME. (CME batch modification center)

To modify objects, such as BSCs, BTSs, cells, and TRXs, in batches, click the icon on theCME configuration interface to start the batch modification wizard. For the method ofperforming batch modifications through the CME batch modification center, press F1 on thewizard interface to obtain online help.----End

NOTE

Configure the following managed objects (MOs) when a built-in PCU is used.

Table 6-3 Configuring parameters on the CMESN MO NE Parameter

NameParameterID

SupportsCME BatchModification Center

1 GCELLPRIVATEOPTPARA

BSC6900/BSC6910

InactivePeriod ofExtendedUplink TBF

UPEXTTBFINACTDELAY

Yes



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SN MO NE ParameterName

ParameterID


GCELLPSBASE

Not SendDummyMessagewithExtendedUplink TBF

EXTUTBFNODATA

2 GCELLPSBASE

BSC6900/BSC6910

Support11BITEGPRSAccess

EGPRS11BITCHANREQ

Yes

BSCPSSOFTPARA

Force MSTwo-phaseAccess

Force2Phase

3 GCELLPSBASE

BSC6900/BSC6910

AccessTechnologies RequestSwitch

AccTechReqSw

Yes

6.3.4 Activation ObservationStep 1 Verify the 11-Bit EGPRS access on the CCCH.

Use an MS that supports 11-Bit EGPRS access to perform a PS service.Expected result: The random access information element (IE) in the channel request indicatesthat the request is an 11-bit access burst, and the access is successful.

Step 2 (Optional) Verify the reporting of the RA capability during one-phase access.Use an MS to initiate dial-up access and perform the attach service.Expected result: After Access Technologies Request Switch is set to ON(On), Gb-interfacemessage tracing results indicate that the duration from the reception of an attach message to thereception of an attach complete message is shortened.----End

6.3.5 DeactivationUsing the LMT

On the BSC LMT, perform the following steps:Step 1 Deactivate the 11-Bit EGPRS access on the CCCH.



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Run the SET GCELLPSBASE command with Support 11BIT EGPRS Access set to NO(NO).

Step 2 (Optional) Disable the reporting of the RA capability during one-phase accessRun the SET GCELLPSBASE command with Access Technologies Request Switch set toOFF(Off).----End

MML Examples//Deactivating the 11-Bit EGPRS access on the CCCHSET GCELLPSBASE: IDTYPE=BYID, CELLID=0, EGPRS11BITCHANREQ=NO;

//(Optional) Disabling the reporting of the RA capability during one-phase access//Using a built-in PCUSET GCELLPSBASE: IDTYPE=BYID, CELLID=0, AccTechReqSw=OFF;

Using the CMENOTE

When configuring the 11-Bit EGPRS Access feature on the CME, you must perform a single configurationfirst, and then perform batch modifications if required.You must perform a single configuration for a parameter before batch modifications of the parameter. Youare advised to perform batch modifications before logging out of the parameter setting interface.

Step 1 Configure a single object on the CME. (CME single configuration)Set parameters on the CME configuration interface according to the operation sequencedescribed in Table 6-4. For the method of performing the CME single configuration, see CMESingle Configuration Operation Guide.

Step 2 Modify objects in batches on the CME. (CME batch modification center)

To modify objects, such as BSCs, BTSs, cells, and TRXs, in batches, click the icon on theCME configuration interface to start the batch modification wizard. For the method ofperforming batch modifications through the CME batch modification center, press F1 on thewizard interface to obtain online help.----End

NOTE

Configure the following MOs when a built-in PCU is used.



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Table 6-4 Configuring parameters on the CMESN MO NE Parameter

NameParameterID


1 GCELLPRIVATEOPTPARA

BSC6900/BSC6910

InactivePeriod ofExtendedUplink TBF

UPEXTTBFINACTDELAY

Yes

2 GCELLPSBASE

BSC6900/BSC6910

Support11BITEGPRSAccess

EGPRS11BITCHANREQ

Yes

3 GCELLPSBASE

BSC6900/BSC6910

AccessTechnologies RequestSwitch

AccTechReqSw

Yes

6.4 Monitoringl Monitor the changes in the number of TBF establishments during one-phase access and

two-phase access.l Monitor the changes in the first ping delay and the GMM/SM delay of EGPRS-capable

MSs.

6.5 Parameter OptimizationNone

6.6 TroubleshootingNone



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7 ParametersTable 7-1 Parameter description

Parameter ID NE MMLCommand

Feature ID Feature Name Description

AccTechReqSw

BSC6900 SETGCELLPSBASE

GBFD-119201 11-Bit EGPRSAccess

Meaning:Whether to report theradio access(RA) capabilityof an MS duringthe 11-BitEGPRS one-phase access.Ifthe MS supportsthe one-phaseRA reportfunction, the MSreports the RAcapability basedon the values ofIEs in animmediateassignmentmessage.GUI ValueRange:OFF(Off), ON(On)Unit:NoneActual ValueRange:OFF, ONDefaultValue:OFF(Off)

GSM BSS11-Bit EGPRS Access Feature Parameter Description 7 Parameters


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AccTechReqSw



Meaning:Whether to report theradio access(RA) capabilityof an MS duringthe 11-BitEGPRS one-phase access.Ifthe MS supportsthe one-phaseRA reportfunction, the MSreports the RAcapability basedon the values ofIEs in animmediateassignmentmessage.GUI ValueRange:OFF(Off), ON(On)Unit:NoneActual ValueRange:OFF, ONDefaultValue:OFF(Off)

EGPRS11BITCHANREQ



Meaning:Whether to support the11-bit EGPRSaccess requestGUI ValueRange:NO(NO), YES(YES)Unit:NoneActual ValueRange:NO, YESDefaultValue:NO(NO)



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EGPRS11BITCHANREQ



Meaning:Whether to support the11-bit EGPRSaccess requestGUI ValueRange:NO(NO), YES(YES)Unit:NoneActual ValueRange:NO, YESDefaultValue:NO(NO)



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8 CountersTable 8-1 Counter description

Counter ID Counter Name CounterDescription

NE Feature ID Feature Name

1278709421 BSC.ACC.RACH.11BIT.1PHASE.ACCESS.REQ

ZA9405:Number of 11-Bit OnePhase AccessRequestsReceived onRACH per BSC

BSC6910 GBFD-119201 11-Bit EGPRSAccess

1279169421 RACH.11BIT.1PHASE.ACCESS.REQ

A9405:Numberof 11-Bit OnePhase AccessRequestsReceived onRACH


1278709421 BSC.ACC.RACH.11BIT.1PHASE.ACCESS.REQ

ZA9405:Number of 11-Bit OnePhase AccessRequestsReceived onRACH per BSC


1279169421 RACH.11BIT.1PHASE.ACCESS.REQ

A9405:Numberof 11-Bit OnePhase AccessRequestsReceived onRACH


GSM BSS11-Bit EGPRS Access Feature Parameter Description 8 Counters


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9 GlossaryFor the acronyms, abbreviations, terms, and definitions, see Glossary.

GSM BSS11-Bit EGPRS Access Feature Parameter Description 9 Glossary


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10 Reference Documents1. 3GPP TS 43.064: Overall description of the GPRS Radio Interface; Stage 22. 3GPP TS 48.018: BSS GPRS Protocol (BSSGP)3. 3GPP TS 44.060: Radio Link Control (RLC) / Medium Access Control (MAC) protocol4. 3GPP TS 44.018: Radio Resource Control (RRC) protocol

GSM BSS11-Bit EGPRS Access Feature Parameter Description 10 Reference Documents


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Contents1 About This Document1.1 Scope1.2 Intended Audience1.3 Change History

2 Overview2.1 Introduction2.2 Feature Support by NE

3 Technical Description3.1 One-Phase Packet Access on the Uplink CCCH3.2 One-Phase Packet Access on the Uplink PCCCH

4 Related Features5 Impact on the Network5.1 Impact on System Capacity5.2 Impact on Network Performance

6 Engineering Guidelines6.1 When to Use 11-Bit EGPRS Access6.2 Network Planning6.2.1 RF Planning6.2.2 Network Topology6.2.3 Hardware Planning

6.3 Deploying 11-Bit EGPRS Access6.3.1 Deployment Requirements6.3.2 Data Preparation6.3.3 Feature Activation6.3.4 Activation Observation6.3.5 Deactivation

6.4 Monitoring6.5 Parameter Optimization6.6 Troubleshooting

7 Parameters8 Counters9 Glossary10 Reference Documents

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