zgo-01-01-001 half rate v8.20 20091230.pdf

8/10/2019 ZGO-01-01-001 Half Rate V8.20 20091230.pdf

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ZGO-01-01-001 Half RateFeature Description


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ZGO-01-01-001 Half Rate

ZTE Confidential Proprietary 2010 ZTE Corporation. All rights reserved. I


Version Date Author Approved By Remarks

V8.01 2008-3-18 Not open to the Third Party




2010 ZTE Corporation. All rights reserved.

ZTE CONFIDENTIAL: This document contains proprietary information of ZTE and is not to bedisclosed or used without the prior written permission of ZTE.

Due to update and improvement of ZTE products and technologies, information of the document issubjected to change without notice.


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II 2010 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary

TABLE OF CONTENTS

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

2 Overview ..................................................................................................................... 1 2.1 Feature Introduction ..................................................................................................... 1 2.2 Corelation with Other Features ..................................... ........................................ ....... 2

3 Technical Descript ion ................................................................................................ 2 3.1 HR Speech Codec .......................................... ......................................... .................... 3 3.2 HR Channel Code ........................................... ....................................... ...................... 3 3.3 Rate Adaptation ...................................... ........................................ ............................. 3 3.4 HR Channel Allocation ................................................................................................ 3

4 Parameters and Conf igurations ............................................................................... 4 4.1 Parameter List ............................................................................................................. 4 4.2 Parameter Configuration ............................................................................................. 6

5 Related Count ers and Alarms ................................................................................. 12 5.1 Related Counters ..................................... ....................................... ........................... 12 5.2 Related Alarms ........................................ ....................................... ........................... 20

6 Engineering Guide ................................................................................................... 20 6.1 Application Scenario .................................. ..................................... ........................... 20 6.2 Configuration Description .................................. .................................... .................... 21 6.3 Network Impact ........................................ ....................................... ........................... 21

7 Abbreviation ......... ..................................... ....................................... ........................ 21

8 Reference Document ............................................................................................... 22

FIGURES

Figure 1 Configuring HR 1 ........................................................................................................... 7 Figure 2 Configuring HR 2 ........................................................................................................... 8 Figure 3 Configuring HR 3 ........................................................................................................... 9 Figure 4 Configuring HR 4 ......................................................................................................... 10 Figure 5 Configuring HR 5 ......................................................................................................... 11 Figure 6 Configuring HR 6 ......................................................................................................... 12


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ZTE Confidential Proprietary 2010 ZTE Corporation. All rights reserved. 1

1 Feature Attribute

iBSC Version: [iBSC V6.20]

BTS Version: [No requirements of BTS hardware platform]

Property: [Optional]

Related Network Elements and Requirements:

NE Name Related orNot Special Requirements

MS

BTS

BSC MSC

MGW -

SGSN -

GGSN -

HLR -

Dependency: [None]

Exclusive Function: [None]

Note: [None]

2 Overview

2.1 Feature Introduction A network can be expanded by adding sites and carrier frequencies, which results in theincrease of investment and network re-planning. The half rate (HR) is provided in theBSS and can be used to increase the capacity of speech subscribers conveniently, thatis, only modify the configurations. The HR is a service bearer in the GSM, with thesupport of the network and terminal at the same time. Hence, the usage of this functionis related to the number of MS that supports the HR.

With the contrast to the full rate (FR), the HR increases the capacity and spectrumefficiency through reducing the bit rate. The speech subscriber capacity of onetransceiver is doubled if 100% of it is used (the prerequisite is that terminals support theHR function).

In the HR Speech mode two subscribers share one timeslot. Thus, spectrum resourcesare used more effectively. In the allocation of the HR, the ZTE iBSC avoids theoccurrence of HR fragmentations to reserve continuous and complete timeslot for FRallocation and data services In addition, the iBSC can gather the fragmental HR


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2 2010 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary

channels by internal cell handover, which is re-packaging mechanism for ongoing halfrate calls.

Two HR subscribers share 16 kbps transmission of Abis interface; therefore, thetransmission in Abis interface is not affected.

In poor radio environments, the speech quality of the HR decreases. The ZTE BSSmonitors the strength of radio signals and speech quality to dynamically switch betweenthe HR and FR for a subscriber. In this way, the network capacity increases with thesatisfying service quality.

2.2 Correlation with Other Features BSC tries to allocate high-quality FR when distributing traffic channels according to MSand network configurations; if MS and network configuration support AMR, and networkbusy level hits AMR threshold, AMR HR channels will be allocated; if MS and networkconfiguration support HR, and network busy level reaches HRR threshold, HR channelswill be allocated; during gradually releasing traffic channels, due to HR channels, lots offragmental channels will appear on timeslot, which impacts offering high-quality FR andPS services. Collect HR channels by defragmentation to eliminate fragmental channels,packing up more valid FR channels.

This feature is related with the following functions: ZGO-03-02-005 Dynamic Half Rate Allocation

ZGO-01-01-003 Adaptive Multi-rate Codec (AMR)

ZGO-03-02-004 HR Concentration

3 Technical DescriptionGSM is a TDM system, 1 frequency includes 8 physical channels, and 1 GSM TDMAframe includes 8 TS. 1 speech channel TCH include 26-frame multiframe, time is 120ms.The 13 th frame is SACCH and the 26 th frame is idle.

With HR scheme, the frame structure will remain unchanged, the odd number frame isassigned to one user and the even number frame is assigned to another user, previousidle frame-26 th frame is assigned as the second users SACCH. Thus the channel forone user now can support 2 subscribers and the channel capacity doubles. Thenegative effect is that with HR coding the speech quality decreases as HR codeccontains less capacity for redundancy and error correction functionality.

If network devices and terminals support HR speech mode, the HR function can beused. In the HR mode, the capacity of speech subscribers is doubled. In the FR code

mode, one carrier frequency supports 8 speech subscribers. In the HR code mode, onecarrier frequency supports 16 speech subscribers.


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3.1 HR Speech CodecThe HR speech codec is the Vector-Sum Excited Linear Predictive coding (VSELP)mode. The final speech rate is 5.6 kbps, that is, each speech frame lasts for 20 ms, with112 bits, which contains class-1 bit (95 bits) and class-2 bit (17 bits).

HR speech encoder takes its input as a 13 bit uniform Pulse Code Modulated (PCM)signal either from the audio part of the MS or on the network side, from the PSTN via an8 bit/A-law or U-law (PCS 1900) to 13 bit uniform PCM conversion. The encoded speechat the output of the speech encoder is delivered to the channel coding function asdefined in GSM 05.03 [3] to produce an encoded block consisting of 228 bits leading toa gross bit rate of 11,4 kbit/s. In the RX direction, the inverse operations take place.

GSM 06.20 describes the detailed mapping between input blocks of 160 speechsamples in 13 bit uniform PCM form into encoded blocks of 112 bits and from encodedblocks of 112 bits to output blocks of 160 reconstructed speech samples. The samplingrate is 8 000 sample/s leading to an average bit rate for the encoded bit stream of 5.6kbit/s. The coding scheme is called Vector Sum Excited Linear Prediction (VSELP)coding.

3.2 HR Channel CodeThe 112-bit HR speech frame outputs 228-bit data (k=0-227, k is index) after externalcodes (packet code) and internal codes (perforated convolutional code). Then, adding 4frame stealing bit (k=228-231), the HR speech frame outputs 232-bit data and maps tofour burst impulses after rearrangement and interleaving.

The coding and decoding mode of the FACCH/H in the HR channel is the same as thatof the FACCH/F channel. The interleaving and deinterleaving are slightly different. InFACCH/F, the interleaving is in eight BURSTs. In FACCH/H, the interleaving is in sixBURSTs.

The coding, decoding, interleaving, and deinterleaving of SACCH/TH in the HR speechchannel are the same as those in the SACCH/TF.

3.3 Rate AdaptationIn the uplink, 112bit HR speech frames plus the synchronization and control informationconstitute 160bit TRAU frame. Then, the TRAU frame is sent to the TC. The TC unitimplements the conversion from the HR coding to 64 k PCM coding.

In the downlink, the TRAU frame from the TC unit is converted to the 112bit HR speechframe. Then, it implements the channel coding.

3.4 HR Channel Allocation

iBSC needs Ms and network support to allocate HR channels for CS service. Firstly MShas to support HR speech version, channel strategy in MSC part supports HR, andpreferred channel types and speech version configured in iBSC configurationmanagement which is able to activate HR.


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Channel allocation process is as follows:

The allocating of HR channel is controlled by many aspects. The detail is as follows:

At first, MS sends the channel allocation request to MSC. The request contains the

information that the HR is supported by the MS.

Then, MSC delivers the allocation request to iBsc through A interface, the requestcontains the information that what channel type is supported by the MSC.

Finally, the iBsc decide whether the new channel will select the HR speech mode,depending on the conditions including: MS supporting, MSC supporting, and theconfiguration of the iBsc configuration management. The configuration includes thechannel preferred strategy and speech version supporting, and the channel typeselection of A interface.

In the channel preferred strategy, you can choose between 2 types: HR PREFER, HRONLY.

If the result of the iBsc decision is HR and also there are available channel resources,then directly allocate HR channel for subscribers.

4 Parameters and Configurations

4.1 Parameter ListFull name Preferred speech version (half) Abbreviation PreferSpeechVer

DescriptionWhen implementing the CS channel allocation policy,describe the preferred half-rate speech version. Halfrateversion 1 refers to HR, and version 3 for AMR

Value Range Not specify the preferred version, Half-rate version 1, Half-rate version 3

Unit None

Default Not specify the preferred version

Management Object BSC

Full name Low priority of channel select priority

Abbreviation ChanSelectPrio_0

Description

When implementing the CS channel allocation policy,

BSC describes the channel select strategy while TCHallocation

Value Range No change, Full rate first, Half rate first, Only full rateallowed, Only half rate allowed

Unit None

Default No change

Management Object BSC


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Full name High priority of channel select priority Abbreviation ChanSelectPrio_1

DescriptionWhen implementing the CS channel allocation policy,BSC describes the channel select strategy while TCH

allocationValue Range No change, Full rate first, Half rate first, Only full rateallowed, Only half rate allowed

Unit None

Default No change

Management Object BSCFull name Ts Channel Combinatio n Abbreviation None

Description

This parameter defines combined types of timeslot channel.The correlation with the following parameters is as follows:

CBC supported (SmsCbUsed).

If CBC Supported (SmsCbUsed)is No,that is, CBC is notsupported, the system automatically finds all timeslotchannel combinations in the cell. If CBC channelexists, it is changed to SDCCH. If CBC Supported(SmsCbUsed)is Yes, that is, CBC is supported, the systemautomatically finds all timeslot channel combinations in thecell. If a non-BCCH channel is found for a carrier, it ischanged to SDCCH+CBCH.

Support GPRS (PsSupport)If GPRS Supported (PsSupport)is No,that is, GPRS is notsupported, the system automatically changes all timeslotchannels whose type is PS in the cell to TCH.

Common control channel configuration(CcchConf)If CcchConf is configured as CCCH uses one physicalchannel, combined with SDCCH,then in the channelparameters, channel combination of timeslot 0 must be oneof the following two combinations: BCCH+SDCCH/4and BCCH+SDCCH/4+CBCH. When CcchConf isconfigured as CCCH uses one physical channel, notcombined with SDCCH, then in the channel parameters,channel combination of timeslot 0 must be one of thefollowing two combinations:

FCCH+SCH+BCCH+CCCH and BCCH+CCCH.

When CcchConf is configured as CCCH uses two physicalchannel, not combined with SDCCH, then in the channelparameters,channel combination of timeslot 0 and timeslot

2 is one of the following two combinations:FCCH+SCH+BCCH+CCCH and BCCH+CCCH.When CcchConf is configured as CCCH uses threephysical channel, not combined with SDCCH, then in thechannel parameters, channel combination of timeslot 0, 2,


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and

4 is one of the following two combinations:FCCH+SCH+BCCH+CCCH and BCCH+CCCH.When CcchConf is configured as CCCH uses four physical

channel, not combined with SDCCH, then in the channelparameters, channel combination of timeslot 0, 2, 4, and6 is one of the following two combinations:FCCH+SCH+BCCH+CCCH and BCCH+CCCH.

Value Range

TCH/F;TCH/H (0 1)+FACCH/H (0 1)+SACCH/TH (0 1);TCH/H ( 0, 0)+FACCH/H (0, 1)+SACCH/TH (0, 1)+TCH/H(0, 1);SDCCH/8+SACCH/C8;FCCH+SCH+BCCH+CCCH;BCCH+SDCCH/4;BCCH+CCCH;BCCH+SDCCH/4+CBCH;SDCCH+CBCH;PBCCH+ PCCCH+PDTCH+PACCH+PTCCH;PCCCH+PDTCH+PACCH+PTCCH;PDTCH+PACCH+PTCCH;

Unit None

Default TCH/F

Management Object TRXFull name Dynamic ts Abbreviation None

Description YES: Representing dynamic timeslot; NO: Representingfixedly configured timeslotValue Range Yes/No

Unit None

Default YesManagement Object TS1 number

4.2 Parameter Configuration

1 In the configuration resource tree window, select OMC GERAN Subnetwork BSC Managed Element Config Set Create BSC Function ], show as following

figure:


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Figure 1 Configuring HR 1

2 Click BSC Function , in the Others tab of Create BSC Function , set PreferredSpeech Version(Half) to HR version 1 regardless of the preferred speech versionunder subscribers priority, shown as following figure:


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3 In the navigation tree, right click [ OMC GERAN Subnetwork BSC ManagedElement Config Set BSC Function Site Config BTS ID Create Cell ],show as following figure:


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4 Click Cell , in Create Cell -> Other Params tab (click to unfold all sub tabs), setLow Priorit y of Channel Select Priority and High Priority of Channel Select Priority according to speech versions under subscribers priority, shown as following Figure:


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5 In the navigation tree, right click [ OMC GERAN Subnetwork BSC ManagedElement Config Set BSC Function Site Config BTS ID Create TRX],show as following figure:


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6 Click TRX, in Channel Inf o tab of Create TRX , set Ts ChannelComb and DynamicTs value to make further setting on channel types for each TRX and each channel typesof the TRX, shown as following figure:


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5 Related Counters and Alarms

5.1 Related Counters

Counter ID What It Counts

C900060038 Number of signaling TCH/H seizure attempts for assignment

C900060039 Number of signaling TCH/H seizure failure for assignment

C900060040 Number of signaling TCH/H seizure attempts for handover

C900060041 Number of signaling TCH/H seizure failure for handover

C900060042 Number of voice TCH/H seizure attempts for assignment

C900060043 Number of voice TCH/H seizure failure for assignment

C900060044 Number of voice TCH/H seizure attempts for handover

C900060045 Number of voice TCH/H seizure failure for handover

C900060046 Number of data TCH/H seizure attempts for assignment

C900060047 Number of data TCH/H seizure failure for assignment

C900060048 Number of data TCH/H seizure attempts for handover

C900060049 Number of data TCH/H seizure failure for handover


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C900060055 Number of TCH/H drops

C900060061 Average number of idle TCH/H with interference band 1





C900060121 Maximum number of busy TCH/H

C900060127 TCH/H busy time

C900060135 Number of signaling TCH/H assignment failure

C900060151 Number of voice TCH/H drops due to handover failure

C900060155 Number of available defined TCH/H

C900060174 Number of signaling TCH/H allocation failure for assignment

C900060175 Number of TCH/H allocation failure due to channel activation failure forassignment (speech version1)

C900060176 Number of TCH/H allocation failure due to BTS connection failure forassignment (speech version1)

C900060177 Number of TCH/H allocation failure due to BIU connection failure forassignment (speech version1)

C900060178 Number of TCH/H allocation failure due to TCU connection failure forassignment (speech version1)

C900060179 Number of TCH/H allocation failure due to channel activation failure forhandover (speech version1)

C900060180 Number of TCH/H allocation failure due to BTS connection failure forhandover (speech version1)

C900060181 Number of TCH/H allocation failure due to BIU connection failure forhandover (speech version1)

C900060182 Number of TCH/H allocation failure due to TCU connection failure forhandover (speech version1)










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C900060199 Number of Voice TCH/H assignment successC900060200 Number of Voice TCH/H assignment failure

C900060201 Number of Voice TCH/H handover success

C900060202 Number of data TCH/H allocation failure due to channel activationfailure for assignment

C900060203 Number of data TCH/H allocation failure due to BTS connection failurefor assignment

C900060204 Number of data TCH/H allocation failure due to BIU connection failurefor assignment

C900060205 Number of data TCH/H allocation failure due to TCU connection failurefor assignment

C900060206 Number of data TCH/H allocation failure due to channel activationfailure for handover

C900060207 Number of data TCH/H allocation failure due to BTS connection failurefor handover

C900060208 Number of data TCH/H allocation failure due to BIU connection failurefor handover

C900060209 Number of data TCH/H allocation failure due to TCU connection failurefor handover

C900060210 Number of data TCH/H assignment success

C900060211 Number of data TCH/H assignment failure

C900060212 Number of data TCH/H handover success

C900060217 Number of unavailable defined TCH/HC900060222 Number of signaling TCH/H drops due to handover failure

C900060223 Number of data TCH/H drops due to handover failure

C900060224 Number of TCH/H handover attempts due to UL strength

C900060225 Number of TCH/H handover attempts due to DL strength

C900060226 Number of TCH/H handover attempts due to UL quality


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C900060227 Number of TCH/H handover attempts due to DL quality

C900060228 Number of TCH/H handover attempts due to UL interference

C900060229 Number of TCH/H handover attempts due to DL interference

C900060230 Number of TCH/H handover attempts due to good C/I

C900060231 Number of TCH/H handover attempts due to bad C/I

C900060232 Number of TCH/H handover attempts due to PBGT

C900060233 Number of TCH/H handover attempts due to large TA

C900060234 Number of TCH/H handover attempts due to other reasons

C900060235 Number of signaling TCH/H assignment success

C901060058 Number of TCH/H handover attempts due to quick break up of UL

C901060059 Number of TCH/H handover attempts due to macro-micro switch

C901060060 Number of TCH/H handover attempts due to MSC request

C901060061 Number of TCH/H handover attempts due to traffic

C901060062 Number of TCH/H handover attempts due to large TA and wastage

C901060063 Number of TCH/H handover attempts due to small TA and wastage

C901060064 Number of TCH/H handover attempts due to a preferable electricitylevel in 3G adjacent cell

C901060065 Number of TCH/H handover attempts due to forced transfer

C901060066 Number of TCH/H handover attempts during assignment due toforced transfer

C901060067 Number of TCH/H handover attempts during handover due to forcedtransfer

C901060068 Number of TCH/H handover attempts during handover due to TAincrease

C901060069 Number of TCH/H handover attempts during handover due to TAdecrease

C901060070 Number of TCH/H handover attempts due to other reasons

C901070029 Number of signaling TCH/H drops due to loss of contact with RANA

C901070030 Number of signaling TCH/H drops due to radio link failure

C901070031 Number of signaling TCH/H drops due to LAPD link failure

C901070032 Number of signaling TCH/H drops due to OMC-R forced release

C901070033 Number of signaling TCH/H drops due to forced release by other calls

C901070035 Number of signaling TCH/H drops due to other failure

C901070036 Number of voice TCH/H drops due to loss of contact with RANA

C901070038 Number of voice TCH/H drops due to LAPD link failure

C901070039 Number of voice TCH/H drops due to OMC-R forced release

C901070040 Number of voice TCH/H drops due to forced release by other calls

C901070042 Number of voice TCH/H drops due to other failure

C901070043 Number of data TCH/H drops due to loss of contact with RANA

C901070044 Number of data TCH/H drops due to radio link failure

C901070045 Number of data TCH/H drops due to LAPD link failure


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C901070046 Number of data TCH/H drops due to OMC-R forced release

C901070047 Number of data TCH/H drops due to forced release by other calls

C901070049 Number of data TCH/H drops due to other failure

C901070055 Number of TCH/H link failures

C901070058 Number of RANA link releases due to other cause on TCH/H

C901070060 Number of TCH/F short messages drops

C901070061 Number of TCH/H short messages drops

C901080014 Average number of busy TCH/H

C901080016 TCH/H busy time(SpeechVer1)

C901080017 TCH/H busy time(SpeechVer3)

C901080018 TCH/H congestion time

C901090125 Number of intra-cell TCH/F-to-TCH/H handover

C901090126 Number of intra-cell TCH/F-to-TCH/H handover success

C901090127 Number of intra-cell handover attempts from TCH/H

C901090128 Number of intra-cell TCH/H-to-TCH/F handover

C901090129 Number of intra-cell TCH/H-to-TCH/F handover success

C901090130 Number of intra-cell TCH/H-to-TCH/H handover

C901090131 Number of intra-cell TCH/H-to-TCH/H handover success

C901090135 Number of inter-cell TCH/F-to-TCH/H handover

C901090136 Number of inter-cell TCH/F-to-TCH/H handover success

C901090137 Number of inter-cell handover attempts from TCH/H

C901090138 Number of inter-cell TCH/H-to-TCH/F handover

C901090139 Number of inter-cell TCH/H-to-TCH/F handover success

C901090140 Number of inter-cell TCH/H-to-TCH/H handover

C901090141 Number of inter-cell TCH/H-to-TCH/H handover success

C901120024 Mean number of idle TCH/Hs with interference band 0

C901130003 Number of available TCH/Hs in the second sub cell

C901130004 Number of unavailable TCH/Hs in the second sub cell

C901130051 Number of TCH/H seizure attempts of the second sub cell (used forassignment)

C901130052 Number of TCH/H seizure success of the second sub cell (used forassignment)

C901130053 Number of TCH/H seizure failure of the second sub cell (used forassignment)

C901130054Number of TCH/H seizure attempts of the second sub cell (used forhandover)

C901130055 Number of TCH/H seizure success of the second sub cell (used forhandover)

C901130056 Number of TCH/H seizure failure of the second sub cell (used forhandover)

C901130058 Number of TCH/H call drops in the second sub cell


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C901130060 TCH/H busy time in the second sub cell

C901230016 Number of TCH/H activation attempts (including handover)

C901230017 Number of TCH/H activation success (including handover)

C901230018 Number of TCH/H assignment attempts

C901230019 Number of TCH/H assignment success







C901270002 Number of signaling TCH/H seizure success for assignment

C901270005 Number of signaling TCH/H seizure success for handover

C901270007 Number of signaling TCH/H allocation attempts by BSC for assignment

C901270008 Number of signaling TCH/H allocation success for assignment

C901270010 Number of signaling TCH/H allocation attempts by BSC due tohandover

C901270011 Number of signaling TCH/H allocation success due to handover

C901270012 Number of signaling TCH/H allocation failure due to handover

C901270013 Number of signaling TCH/H assignment attempts by BSC

C901270016 Number of signaling TCH/H handover attempts

C901270017 Number of signaling TCH/H handover success

C901270018 Number of signaling TCH/H handover failure

C901270019 Number of signaling TCH/H handover failure messages do not

received by BSCC901270021 Number of voice TCH/H seizure success for assignment

C901270024 Number of voice TCH/H seizure success for handover

C901270026 Number of TCH/H allocation attempts for assignment by BSC (speechversion 1)

C901270027 Number of TCH/H allocation failure due to channel activation failure forassignment (speech version 1)

C901270032 Number of TCH/H allocation attempts by BSC during handover(speech version 1)

C901270033 Number of TCH/H allocation success during handover (speech version1)

C901270038 Number of TCH/H allocation attempts by BSC for assignment (speechversion 2)

C901270039 Number of TCH/H allocation success by BSC for assignment (speechversion 2)

C901270044 Number of TCH/H allocation attempts for handover by BSC (speechversion 2)

C901270045 Number of TCH/H allocation success for handover (speech version 2)


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C901270050 Number of TCH/H allocation attempts for assignment (speech version3)

C901270051 Number of TCH/H allocation success for assignment (speech version3)

C901270056 Number of TCH/H allocation attempts by BSC for handover (speechversion 3)

C901270057 Number of TCH/H allocation success for handover (speech version 3)

C901270062 Number of Voice TCH/H assignment attempts by BSC

C901270065 Number of Voice TCH/H handover attempts

C901270067 Number of Voice TCH/H handover failure

C901270068 Number of Voice TCH/H handover failure messages do not receivedby BSC

C901270070 Number of data TCH/H seizure success for assignment

C901270073 Number of data TCH/H seizure success for handover

C901270075 Number of data TCH/H allocation attempts for assignment by BSC

C901270076 Number of data TCH/H allocation success for assignment

C901270081 Number of data TCH/H allocation attempts by BSC

C901270082 Number of data TCH/H allocation success for handover

C901270087 Number of data TCH/H assignment attempts by BSC

C901270090 Number of data TCH/H handover attempts

C901270092 Number of data TCH/H handover failure

C901270093 Number of data TCH/H handover failure do not received by BSC

C901270094 Number of TCH/H allocation failure for assignment due to TIPBconnection failure (Speech version 1)

C901270095 Number of TCH/H allocation failure for assignment due to Resourcerequest to iTC failure (Speech version 1)

C901270096 Number of TCH/H allocation failure for handover due to TIPBconnection failure (Speech version 1)

C901270097 Number of TCH/H allocation failure for handover due to Resourcerequest to iTC failure (Speech version 1)




C901270101 Number of TCH/H allocation failure for handover due to Resource

request to iTC failure (Speech version 2)





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C901270105 Number of TCH/H allocation failure for handover due to Resourcerequest to iTC failure (Speech version 3)

C901270106 Number of TCH/H allocation failure due to request AIPB resourcefailure for assignment (speech version 1)

C901270107 Number of TCH/H allocation failure due to request UDP port failure forassignment (speech version 1)

C901270108 Number of TCH/H allocation failure due to AIPB connection failure forassignment (speech version 1)

C901270109 Number of TCH/H allocation failure due to request AIPB resourcefailure for handover (speech version 1)

C901270110 Number of TCH/H allocation failure due to request UDP port failure forhandover (speech version 1)

C901270111 Number of TCH/H allocation failure due to AIPB connection failure forhandover (speech version 1)

C901270112 Number of TCH/H allocation failure due to request AIPB resourcefailure for assignment (speech version 2)






C901270118 Number of TCH/H allocation failure due to request AIPB resource

failure for assignment (speech version 3)






C901270124 Number of TCH/H allocation failure due to request AIPB resourcefailure for assignment (data)

C901270125 Number of TCH/H allocation failure due to request UDP port failure forassignment (data)

C901270126 Number of TCH/H allocation failure due to AIPB connection failure forassignment (data)

C901270127 Number of TCH/H allocation failure due to request AIPB resource


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failure for handover (data)

C901270128 Number of TCH/H allocation failure due to request UDP port failure forhandover (data)

C901270129 Number of TCH/H allocation failure due to AIPB connection failure for

handover (data)

5.2 Related Alarms

None

6 Engineering Guide

6.1 Application Scenario Activating this feature realizes fast expansion of wireless network, relieves networkintense capacity, effectively solving partial traffics congestion, and can be supplementfor urgent expansion solution.

Activating this feature has no bad impacts on network indices, but it will reduce thespeech quality during conversation to some extent. Hence it needs to prudently considerusing this feature in high-value traffic areas or expansion solution in areas whererequires high speech quality.

The following respects should be taken into consideration for deploying HR feature:

1. Proportion of the handsets supporting HR codec

Today most cell phones support HR feature. According to domestic statistics in Chinamainland, over 80% of Handsets supporting HR Codec.

2. Radio Propagation Environment

Using HR will lower the speech quality during conversation in worse radio C/I areas, sodeactivation of this feature is recommended in such areas.

3. Characteristics Of Local Mobile Network

This feature suits for low-value areas with outburst heavy traffics, including suburbs(non-dense-urban areas), outburst heavy traffics areas and areas starving for tacklingtraffic absorbency problems.

This feature can also be used in urban areas with the scarcity of base stations fluctuanttraffics areas where always emergency traffic happens In these areas, all subscribersare open to FR speech service during normal low traffic periods. HR is only for heavytraffic periods.


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6.2 Configuration DescriptionThis feature does not involve iBSC and BTS hardware configuration adjustment.

6.3 Network ImpactImpacts on network performance from this feature can be analyzed by STS(Statistic &Traffic Measurement System) (such as call drop rate, congestion level, access indiceschanges, and data channel allocation in speech channel), MRR(Mean Reciprocal Rank)and DT(Drive Test) test. Specifically, this feature influences the network in followingaspects:

It would increase network capacity in double approximately

In better radio environment, dynamic HR has no impact on call drop rate and traffic droprate; it enhances call success rate and handover success rate a little, apparentlydecrease congestion ratio;

dynamic HR This function provides intelligent HR and FR/EFR channel conversion.When user sets the decision threshold for channel conversion in OMCR, the system willautomatically adjust the number of HR channel and FR/EFR channel in the Abisinterface if condition is satisfied.

By DT test, SQI(speech quality index) and RXQUAL(Received Signal Quality) becomeworse obviously after activating dynamic HR under the same radio environment, andspeech quality during conversation is decreased ; in poor C/I environment, comparedwith FR, HR speech quality;

After all FR channels are occupied, UE not supporting HR will fail to access into network.

Therefore, HR can effectively resolve the heavy traffic problems. But if it desires to keep

better performance, current radio environment needs to be optimized, especially forinterference (after activating HR, encoding type of HR and FR is different, which causesworse channel decoding and decreased capacity with the same environment), thenrequirements on network planning such as frequency planning and coverage control aremore strict

7 Abbreviation

Abbreviations Full Charac ter is ti cs AMR Adaptive Multi-Rate

BSC Base Station ControllerBTS Base Transceiver Station

FR Full Rate

GERAN Gsm/Edge Radio Access Network

GSM Global System for Mobile communications


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zgo-01-01-001 half rate v8.20 20091230.pdf

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