GBSS14.0 Optional Feature Description

GBSS14.0 Optional Feature Description

Issue 02

Date 2012-10-15

HUAWEI TECHNOLOGIES CO., LTD.

Issue 02(2012-08-3115) Huawei Proprietary and Confidential

Copyright Huawei Technologies Co., Ltd

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Copyright Huawei Technologies Co., Ltd. 2012. All rights reserved.

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Huawei Technologies Co., Ltd.

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GBSS14.0 Optional Feature Description Contents



ii

Contents

1 Voice&Service .......................................................................................................................... 1

1.1 Crystal Voice ............................................................................................................................................. 1

1.1.1 GBFD-113301 Enhanced Full Rate ................................................................................................... 1

1.1.2 GBFD-115601 Automatic Level Control (ALC) ................................................................................ 2

1.1.3 GBFD-115602 Acoustic Echo Cancellation (AEC) ............................................................................ 5

1.1.4 GBFD-115603 Automatic Noise Restraint (ANR) ............................................................................. 6

1.1.5 GBFD-115701 TFO .......................................................................................................................... 7

1.1.6 GBFD-115702 TrFO ......................................................................................................................... 9

1.1.7 GBFD-115703 Automatic Noise Compensation (ANC) .................................................................... 11

1.1.8 GBFD-115704 Enhancement Packet Loss Concealment (EPLC) .......................................................12

1.1.9 GBFD-115711 EVAD ......................................................................................................................14

1.1.10 GBFD-116801 Voice Quality Index (VQI) ......................................................................................15

1.1.11 GBFD-115708 Um Interface Speech Frame Repairing ....................................................................16

1.2 AMR Package...........................................................................................................................................17

1.2.1 GBFD-115501 AMR FR ..................................................................................................................17

1.2.2 GBFD-115502 AMR HR..................................................................................................................19

1.2.3 GBFD-115503 AMR Power Control.................................................................................................21

1.2.4 GBFD-115504 AMR FR/HR Dynamic Adjustment...........................................................................22

1.2.5 GBFD-115505 AMR Radio Link Timer ............................................................................................23

1.2.6 GBFD-115506 AMR Coding Rate Threshold Adaptive Adjustment ..................................................24

1.2.7 GBFD-115507 WB AMR .................................................................................................................26

1.3 Voice Capacity ..........................................................................................................................................28

1.3.1 GBFD-113401 Half Rate Speech ......................................................................................................28

1.3.2 GBFD-113402 Dynamic Adjustment Between FR and HR ...............................................................29

1.3.3 GBFD-115522 Dynamic HR/FR Adaptation .....................................................................................31

1.3.4 GBFD-115830 VAMOS ...................................................................................................................32

1.3.5 GBFD-115831 Mute SAIC MS Identification ...................................................................................34

1.3.6 GBFD-115832 VAMOS Call Drop Solution .....................................................................................35

1.4 Cell Broadcast ..........................................................................................................................................37

1.4.1 GBFD-113601 Short Message Service Cell Broadcast (TS23) ..........................................................37

1.4.2 GBFD-113602 Simplified Cell Broadcast .........................................................................................38

1.5 GSM Trunking .........................................................................................................................................39

1.5.1 GBFD-510301 Public Voice Group Call Service ...............................................................................39




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1.5.2 GBFD-510303 Late Group Channel Assignment ..............................................................................40

1.5.3 GBFD-510305 Single Channel Group Call Originating ....................................................................41

1.5.4 GBFD-510306 Talker Identification .................................................................................................42

1.5.5 GBFD-510307 Group Call EMLPP ..................................................................................................43

1.5.6 GBFD-510308 Fast Group Call Setup ..............................................................................................45

1.5.7 GBFD-510309 Group Call Reliability Enhancing .............................................................................46

1.5.8 GBFD-510302 Public Voice Broadcast Service ................................................................................47

1.5.9 GBFD-510304 Late Broadcast Channel Assignment .........................................................................48

1.5.10 GBFD-510310 GSM-T Relay .........................................................................................................49

1.6 LCS..........................................................................................................................................................51

1.6.1 GBFD-115402 LCS (Cell ID + TA) ..................................................................................................51

1.6.2 GBFD-115404 Lb Interface..............................................................................................................52

1.7 VIP Service ..............................................................................................................................................54

1.7.1 GBFD-116001 Resource Reservation ...............................................................................................54

1.7.2 GBFD-115001 Enhanced Multi Level Precedence and Preemption (EMLPP)....................................56

1.7.3 GBFD-115002 Flow Control Based on Cell Priority .........................................................................57

1.7.4 GBFD-115003 Flow control based on User priority ..........................................................................58

1.7.5 GBFD-119907 PS Service in Priority ...............................................................................................60

2 Packet Service ......................................................................................................................... 61

2.1 PS Prime Service ......................................................................................................................................61

2.1.1 GBFD-114101 GPRS .......................................................................................................................61

2.1.2 GBFD-510001 Network Operation Mode I .......................................................................................62

2.1.3 GBFD-114201 EGPRS ....................................................................................................................64

2.1.4 GBFD-510002 Gb Over FR .............................................................................................................66

2.1.5 GBFD-119201 11-Bit EGPRS Access ..............................................................................................67

2.1.6 GBFD-119203 Extended Uplink TBF...............................................................................................68

2.1.7 GBFD-119302 Packet Channel Dispatching .....................................................................................70

2.1.8 GBFD-119509 GPRS Fast Transmission ..........................................................................................71

2.2 PS Service Enhancement ..........................................................................................................................72

2.2.1 GBFD-119901 Streaming QoS(GBR) ...............................................................................................72

2.2.2 GBFD-119902 QoS ARP&THP .......................................................................................................74

2.2.3 GBFD-119904 PS Active Package Management ...............................................................................75

2.2.4 GBFD-119905 PoC QoS ..................................................................................................................77

2.2.5 GBFD-119906 Conversational QoS..................................................................................................78

2.2.6 GBFD-116201 Network-Controlled Cell Reselection (NC2) .............................................................80

2.2.7 GBFD-116301 Network Assisted Cell Change (NACC)....................................................................81

2.2.8 GBFD-119801 Packet SI Status (PSI) ...............................................................................................83

2.2.9 GBFD-119305 BSS Paging Coordination .........................................................................................83

2.2.10 GBFD-119502 PS Handover ..........................................................................................................85

2.2.11 GBFD-119503 Early TBF Establishment ........................................................................................86

2.2.12 GBFD-119504 PS Power Control ...................................................................................................87




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2.2.13 GBFD-119505 PDCH Dynamic Adjustment with Two Thresholds ..................................................88

2.2.14 GBFD-119506 GPRS/EGPRS Time slot multiplexing priority ........................................................89

2.2.15 GBFD-119401 Extended Dynamic Allocation (EDA) .....................................................................90

2.2.16 GBFD-119402 MS High Multislot Classes .....................................................................................91

2.2.17 GBFD-114151 DTM ......................................................................................................................93

2.2.18 GBFD-119403 Class11 DTM .........................................................................................................95

2.2.19 GBFD-119404 HMC DTM ............................................................................................................96

2.2.20 GBFD-119405 14.4kbit/s Circuit Switched Data.............................................................................97

2.2.21 GBFD-119406 High Speed Circuit Switched Data ..........................................................................98

2.3 EDGE Evolution..................................................................................................................................... 101

2.3.1 GBFD-510801 MSRD ................................................................................................................... 101

2.3.2 GBFD-510802 Dual Carriers in Downlink ..................................................................................... 102

2.3.3 GBFD-510803 Uplink EGPRS2-A ................................................................................................. 103

2.3.4 GBFD-510804 Downlink EGPRS2-A ............................................................................................ 105

2.3.5 GBFD-510805 Latency Reduction ................................................................................................. 107

3 Smart MBB ............................................................................................................................ 110

3.1 Intelligent Channel ................................................................................................................................. 110

3.1.1 GBFD-511603 IM Service Efficiency Improvement ....................................................................... 110

3.1.2 GBFD-511604 Web Browsing Service Efficiency Improvement ..................................................... 111

3.1.3 GBFD-511605 Email Service Efficiency Improvement ................................................................... 113

3.1.4 GBFD-511606 Streaming Media Service Resource Balancing ........................................................ 115

3.1.5 GBFD-511607 P2P Resource Balancing ......................................................................................... 116

3.1.6 GBFD-119407 Active TBF Allocation ............................................................................................ 118

3.1.7 GBFD- 511608 WLAN Hot Spot Notification ................................................................................ 119

3.2 Smartphone Solution .............................................................................................................................. 120

3.2.1 GBFD-511501 Multiple CCCHs .................................................................................................... 120

3.2.2 GBFD-511502 Layered Paging ...................................................................................................... 121

3.2.3 GBFD-511503 Dynamic Multiple CCCH ....................................................................................... 122

3.2.4 GBFD-511505 RACH Storm Filtration .......................................................................................... 124

4 Green ...................................................................................................................................... 126

4.1 Power Consumption Saving .................................................................................................................... 126

4.1.1 GBFD-117602 Active Power Control ............................................................................................. 126

4.1.2 GBFD-114801 Discontinuous Transmission (DTX)-Downlink ....................................................... 127

4.1.3 GBFD-114803 Discontinuous Transmission (DTX)-Uplink ............................................................ 128

4.1.4 GBFD-111602 TRX Power Amplifier Intelligent Shutdown ............................................................ 130

4.1.5 GBFD-111603 TRX Power Amplifier Intelligent Shutdown on Timeslot Level ............................... 131

4.1.6 GBFD-111604 Intelligent Combiner Bypass ................................................................................... 132

4.1.7 GBFD-111605 Active Backup Power Control ................................................................................. 134

4.1.8 GBFD-111606 Power Optimization Based on Channel Type ........................................................... 135

4.1.9 GBFD-111608 PSU Smart Control ................................................................................................. 136

4.1.10 GBFD-111609 Enhanced BCCH Power Consumption Optimization ............................................. 138




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4.1.11 GBFD-111610 Dynamic Cell Power Off ....................................................................................... 139

4.1.12 GBFD-111611 TRX Working Voltage Adjustment ........................................................................ 140

4.1.13 GBFD-111612 Multi-Carrier Intelligent Voltage Regulation.......................................................... 142

5 Topology&Transmission .................................................................................................... 144

5.1 Transmission Efficiency .......................................................................................................................... 144

5.1.1 GBFD-116701 16Kbit RSL and OML on Abis Interface ................................................................. 144

5.1.2 GBFD-117301 Flex Abis................................................................................................................ 145

5.1.3 GBFD-117702 BTS Local Switch .................................................................................................. 146

5.1.4 GBFD-118401 Abis Transmission Optimization ............................................................................. 149

5.1.5 GBFD-112013 Abis Congestion Trigger HR Distribution ............................................................... 151

5.1.6 GBFD-116901 Flex Ater ................................................................................................................ 152

5.1.7 GBFD-117701 BSC Local Switch .................................................................................................. 154

5.1.8 GBFD-116902 Ater Compression Transmission.............................................................................. 157

5.1.9 GBFD-115301 Local Multiple Signaling Points .............................................................................. 159

5.1.10 GBFD-117705 PS Dummy Frame Compression ........................................................................... 160

5.2 IP Transmission ...................................................................................................................................... 161

5.2.1 GBFD-118606 Clock Over IP ........................................................................................................ 161

5.2.2 GBFD-118620 Clock over IP support 1588v2 ................................................................................. 164

5.2.3 GBFD-118202 Synchronous Ethernet............................................................................................. 166

5.2.4 GBFD-118601 Abis over IP ........................................................................................................... 167

5.2.5 GBFD-118611 Abis IP over E1/T1 ................................................................................................. 171

5.2.6 GBFD-118604 Abis MUX ............................................................................................................. 173

5.2.7 GBFD-118612 Abis IPHC .............................................................................................................. 175

5.2.8 GBFD-118602 A over IP ................................................................................................................ 176

5.2.9 GBFD-118622 A IP over E1/T1...................................................................................................... 180

5.2.10 GBFD-118610 UDP MUX for A Transmission ............................................................................. 182

5.2.11 GBFD-118623 TDM/IP Dual Transmission over A Interface ......................................................... 183

5.2.12 GBFD-118603 Gb over IP ............................................................................................................ 185

5.2.13 GBFD-118605 IP QoS ................................................................................................................. 186

5.2.14 GBFD-118630 Ethernet OAM ...................................................................................................... 190

5.2.15 GBFD-118631 A Interface Transmission Pool .............................................................................. 192

5.3 Satellite Transmission ............................................................................................................................. 194

5.3.1 GBFD-113901 Satellite Transmission over Abis Interface ............................................................... 194

5.3.2 GBFD-113902 Satellite Transmission over A Interface ................................................................... 195

5.3.3 GBFD-113903 Satellite Transmission over Ater Interface ............................................................... 196

5.3.4 GBFD-113905 Satellite Transmission over Gb Interface ................................................................. 197

5.4 RAN Sharing .......................................................................................................................................... 198

5.4.1 GBFD-118701 RAN Sharing ......................................................................................................... 198

5.4.2 GBFD-118704 Abis Independent Transmission .............................................................................. 200

5.4.3 GBFD-118702 MOCN Shared Cell ................................................................................................ 201

5.4.4 GBFD-118703 IMSI-Based Handover ............................................................................................ 202




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6 Site Solution.......................................................................................................................... 204

6.1 PICO Solution ........................................................................................................................................ 204

6.1.1 GBFD-510601 PICO Automatic Configuration and Planning .......................................................... 204

6.1.2 GBFD-510602 PICO Synchronization............................................................................................ 205

6.1.3 GBFD-510603 PICO Dual-band Auto-planning .............................................................................. 206

6.1.4 GBFD-510604 PICO USB Encryption ........................................................................................... 207

6.1.5 GBFD-510605 PICO Access Control List (ACL) ........................................................................... 208

6.1.6 GBFD-510606 PICO Sleeping Mode ............................................................................................. 209

6.1.7 GBFD-510607 PICO Automatic Optimization ................................................................................ 210

6.1.8 GBFD-510608 PICO Transceiver Redundancy ............................................................................... 211

6.2 EasyGSM Solution ................................................................................................................................. 212

6.2.1 GBFD-510701 Compact BTS Automatic Configuration and Planning ............................................. 212

6.2.2 GBFD-510702 Compact BTS Automatic Capacity Planning ........................................................... 214

6.2.3 GBFD-510704 Compact BTS Automatic Neighbor Cell Planning and Optimization ....................... 215

6.2.4 GBFD-510705 Compact BTS Timing Power Off ............................................................................ 216

6.2.5 GBFD-510706 Local User Management......................................................................................... 217

6.2.6 GBFD-111613 Weather Adaptive Power Management .................................................................... 219

6.3 Auxiliary Equipment Management .......................................................................................................... 221

6.3.1 GBFD-510710 Intelligent Battery Management .............................................................................. 221

7 Network Performance .......................................................................................................... 224

7.1 Coverage Enhancement .......................................................................................................................... 224

7.1.1 GBFD-115901 PBT(Power Boost Technology) .............................................................................. 224

7.1.2 GBFD-115902 Transmit Diversity .................................................................................................. 225

7.1.3 GBFD-115903 4-Way Receiver Diversity ....................................................................................... 226

7.1.4 GBFD-118101 Dynamic Transmit Diversity ................................................................................... 227

7.1.5 GBFD-118102 Dynamic PBT (Power Boost Technology) ............................................................... 228

7.1.6 GBFD-118104 Enhanced EDGE Coverage ..................................................................................... 230

7.1.7 GBFD-118106 Dynamic Power Sharing ......................................................................................... 231

7.1.8 GBFD-114001 Extended Cell......................................................................................................... 233

7.2 Capacity Improvement ............................................................................................................................ 235

7.2.1 GBFD-113201 Concentric Cell ...................................................................................................... 235

7.2.2 GBFD-114501 Co-BCCH Cell ....................................................................................................... 237

7.2.3 GBFD-114402 Enhanced Dual-band Network ................................................................................ 238

7.2.4 GBFD-117001 Flex MAIO ............................................................................................................ 239

7.2.5 GBFD-115801 ICC ........................................................................................................................ 240

7.2.6 GBFD-115821 EICC...................................................................................................................... 242

7.2.7 GBFD-113701 Frequency Hopping (RF hopping, baseband hopping) ............................................. 243

7.2.8 GBFD-113702 BCCH Carrier Frequency Hopping ......................................................................... 245

7.2.9 GBFD-113703 Antenna Frequency Hopping .................................................................................. 246

7.2.10 GBFD-118001 BCCH Dense Frequency Multiplexing .................................................................. 247

7.2.11 GBFD-117002 IBCA (Interference Based Channel Allocation) ..................................................... 249




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7.2.12 GBFD-118201 Soft-Synchronized Network .................................................................................. 251

7.2.13 GBFD-510401 BTS GPS Synchronization ................................................................................... 253

7.2.14 GBFD-118103 Network Support SAIC ........................................................................................ 254

7.2.15 GBFD-113706 Mega BSC............................................................................................................ 255

7.2.16 GBFD-119507 PS Downlink DTX ............................................................................................... 257

7.2.17 GBFD-119508 PS Uplink DTX .................................................................................................... 258

7.3 High Speed Mobility............................................................................................................................... 259

7.3.1 GBFD-510101 Automatic Frequency Correction (AFC) ................................................................. 259

7.3.2 GBFD-510102 Fast Move Handover .............................................................................................. 261

7.3.3 GBFD-510103 Chain Cell Handover .............................................................................................. 262

7.3.4 GBFD-510104 Multi-site Cell ........................................................................................................ 263

7.3.5 GBFD-510105 PS AFC .................................................................................................................. 265

7.4 Intra-System Mobility Management ........................................................................................................ 267

7.4.1 GBFD-510501 HUAWEI II Handover............................................................................................ 267

7.4.2 GBFD-510502 Handover Re-establishment .................................................................................... 268

7.4.3 GBFD-117501 Enhanced Measurement Report (EMR) ................................................................... 269

7.4.4 GBFD-117101 BTS Power Lift for Handover ................................................................................. 271

7.5 GSM & WCDMA Interoperability .......................................................................................................... 272

7.5.1 GBFD-114301 GSM/WCDMA Interoperability .............................................................................. 272

7.5.2 GBFD-114321 GSM/WCDMA Service Based Handover ................................................................ 273

7.5.3 GBFD-114322 GSM/WCDMA Load Based Handover ................................................................... 275

7.5.4 GBFD-114323 GSM/WCDMA Cell Reselection Based on MS State .............................................. 276

7.5.5 GBFD-114325 Fast WCDMA Reselection at 2G CS Call Release ................................................... 277

7.5.6 GBFD-511101 Load Based Handover Enhancement on Iur-g .......................................................... 278

7.5.7 GBFD-511102 NACC Procedure Optimization Based on Iur-g between GSM and WCDMA .......... 280

7.5.8 GBFD-511103 GSM and WCDMA Load Balancing Based on Iur-g ................................................ 282

7.5.9 GBFD-511104 GSM and WCDMA Traffic Steering Based on Iur-g ................................................ 284

7.5.10 GBFD-511110 BSC supporting Blind Search ................................................................................ 285

7.6 GSM & LTE Interoperability .................................................................................................................. 287

7.6.1 GBFD-511301 Cell Reselection Between GSM and LTE ................................................................ 287

7.6.2 GBFD-511302 PS Handover Between GSM and LTE Based on Coverage ...................................... 288

7.6.3 GBFD-511303 PS Handover Between GSM and LTE Based on Quality.......................................... 290

7.6.4 GBFD-511304 PS Handover Between GSM and LTE Based on Cell Load ...................................... 291

7.6.5 GBFD-511305 PS Handover Between GSM and LTE Based on Mode Priority................................ 293

7.6.6 GBFD-511306 GSM/LTE Service Based PS Handover ................................................................... 294

7.6.7 GBFD-511307 eNC2 Between GSM and LTE ................................................................................ 296

7.6.8 GBFD-511308 eNACC Between GSM and LTE ............................................................................. 298

7.6.9 GBFD-511309 SRVCC .................................................................................................................. 299

7.6.10 GBFD-511310 Multi Technology Neighbour Cell Based Handover ............................................... 300

7.6.11 GBFD-511312 Fast LTE Reselection at 2G CS Call Release ......................................................... 301

7.6.12 GBFD-511313 CSFB ................................................................................................................... 303

7.7 GSM & TD-SCDMA Interoperability ..................................................................................................... 304




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7.7.1 GBFD-114302 GSM/TD-SCDMA Interoperability ......................................................................... 304

7.7.2 GBFD-511401 Iur-g Interface Between GSM and TD-SCDMA ...................................................... 305

7.7.3 GBFD-511402 Radio Resource Reserved Handover Between GSM/TD-SCDMA Based on Iur-g .... 307

7.7.4 GBFD-511403 Extended BCCH..................................................................................................... 308

7.7.5 GBFD-511405 NC2 between GSM and TD-SCDMA ..................................................................... 309

8 Network Security ................................................................................................................. 312

8.1 Security .................................................................................................................................................. 312

8.1.1 GBFD-113501 A5/1 and A5/2 Ciphering Algorithm ....................................................................... 312

8.1.2 GBFD-113503 A5/3 Ciphering Algorithm ...................................................................................... 313

8.1.3 GBFD-113521 A5/1 Encryption Flow Optimization ....................................................................... 314

8.1.4 GBFD-113522 Encrypted Network Management ............................................................................ 315

8.1.5 GBFD-113524 BTS Integrated IPsec .............................................................................................. 317

8.1.6 GBFD-113526 BTS Supporting PKI .............................................................................................. 319

8.2 Reliability............................................................................................................................................... 321

8.2.1 GBFD-117801 Ring Topology ....................................................................................................... 321

8.2.2 GBFD-113801 TRX Cooperation ................................................................................................... 323

8.2.3 GBFD-117401 MSC Pool .............................................................................................................. 325

8.2.4 GBFD-119701 SGSN Pool............................................................................................................. 327

8.2.5 GBFD-116601 Abis Bypass ........................................................................................................... 329

8.2.6 GBFD-113721 Robust Air Interface Signalling ............................................................................... 330

8.2.7 GBFD-117803 Abis Transmission Backup...................................................................................... 332

8.2.8 GBFD-113725 BSC Node Redundancy .......................................................................................... 333

8.2.9 GBFD-113726 TC POOL............................................................................................................... 335

8.2.10 GBFD-113728 OML Backup ....................................................................................................... 337

8.2.11 GBFD-511002 Access Control Class (ACC) ................................................................................. 338

9 O&M Experience .................................................................................................................. 340

9.1 O&M ..................................................................................................................................................... 340

9.1.1 GBFD-113729 Adaptive Transmission Link Blocking .................................................................... 340

9.1.2 GBFD-114701 Semi-Permanent Connection .................................................................................. 341

9.1.3 GBFD-116401 End-to-End MS Signaling Tracing .......................................................................... 344

9.1.4 GBFD-510901 GSM/3G Neighboring Cell Automatic Optimization ............................................... 345

9.2 Visualization & Data Collection .............................................................................................................. 347

9.2.1 GBFD-511701 Radio Measurement Data Interface for Navigation .................................................. 347

A Acronyms and Abbreviations ............................................................................................ 349

GBSS14.0 Optional Feature Description 1 Voice&Service



1

1 Voice&Service 1.1 Crystal Voice

1.1.1 GBFD-113301 Enhanced Full Rate

Availability

This feature was introduced in GBSS6.1.

Summary

The enhanced full rate (EFR) is an improved speech coding scheme. The quality of the speech

using EFR is better than that of the speech using FR.

Benefits

User experience is improved because the voice quality in the EFR that uses the FR channel

resource approaches or even exceeds the voice quality in the ADPCM.

Description

The EFR is an improved speech coding scheme, which works at the rate of 12.2 kbit/s. The

quality of the voice using the FR channel resource in the EFR scheme approaches or even

exceeds the voice quality in the ADPCM scheme.

The EFR has good anti-noise performance. If the quality of the Um interface is good, you can

obtain the voice quality as good as the voice quality of the traditional wired telephone even if

there is a lot of background noise. Therefore, in the same air conditions, the subscriber can

perceive a better voice quality in the EFR than in the FR. In addition, the rate of the EFR is

lower than that of the FR (13 kbit/s). Therefore, the BER sensitivity of EFR is lower than that

of FR. In this manner, the data can be transmitted more reliably on the Abis interface, which

further improves the voice quality.

The EFR is also compatible with the highest rate of the narrowband AMR.

Enhancement

GBSS8.1




2

The EFR is introduced in GBSS8.1 and it is used in A over TDM transmission.

If the EFR feature is supported by the MS and the BSC but not supported by the MSC, the

EFR feature can be forcibly enabled on the BSC. In this manner, the used speech version is

shielded on the MSC side to avoid assignment or handover failure. The forced EFR function

is mainly applied in the areas with poor voice quality to improve the voice quality.

GBSS13.0

E-coder is introduced in GBSS13.0 and it is used in A over TDM transmission.

E-coder improves the EFR speech quality by using the filter enhancement technique during

preprocessing and the Linear Spectral Pairs (LSP) exact-calculate technique. In this way,

E-coder increases the Mean Opinion Score (MOS) by 0.05 to 0.12. E-coder, however,

introduces an algorithm delay of 5 ms to an EFR encoder. In A over IP or TFO, E-coder is not

supported.

Dependency

Dependency on BSC hardware

None

Dependency on BTS hardware

For the dependency on BTS hardware, see the GBSS14.0 Feature List.

Dependency on other GBSS features

None

Dependency on other NEs

MSs must support this feature.

1.1.2 GBFD-115601 Automatic Level Control (ALC)

Availability


Summary

This feature improves user experience by checking the speech signals and then adjusting the

sound volume according to certain rules to keep the sound volume within the comfort range.

Benefits

This feature can level out the difference between the sound volumes controlled by different

terminal manufacturers and therefore balance the receive level adaptation of subscribers in

different areas. In this manner, the subscriber can perceive better voice quality.




3

Description

The ALC algorithm automatically controls the receive level. By evaluating the receive level

of the input signal, the ALC feature controls the gains of the input signal, adjusts the output

signal to a certain target receive level, and maintains the stability and comprehensibility of the

signal receive level. Therefore, the subscriber can perceive comfort sound volume and good

voice quality.

The ALC has the following three modes:

Fixed level mode

The receive level of the signal is adjusted to a fixed target value based on the receive level of the input voice.

Adaptive level mode

The receive level of the signal is adaptively adjusted to a value within a pre-determined range based on the receive level of the input voice.

Fixed gain mode

The sound volume of the input signal is raised or lowered in a fixed proportion based on the original sound volume.

Enhancement

GBSS8.1

The ALC algorithm performance is optimized.

GBSS12.0

The anti-clip (ACLP) algorithm is introduced in GBSS12.0.

The ACLP algorithm first corrects the signals with relatively great amplitude, quickly repairs

the speech wave, and then adjusts the volume. This improves user experience.

The ACLP algorithm calculates the energy and spectrum characteristics of input speech

signals in real time. If too-high-level signals suffer from amplitude limiting and therefore

introduce distorted noises, the ACLP algorithm filters out distorted noises and performs

nonlinear volume adjustments to repair the signal wave according to spectrum characteristics.

In this manner, user experience towards the voice quality is improved.




4

The volume is too

great and signals are

distorted due to

amplitude limiting.

Repair the distorted

signals.

The volume is

acceptable and the

distortion is decreased.

The volume is acceptable

but the distortion

remains.

The function of measuring and collecting statistics on signal levels online is introduced.

In GBSS12.0, the ALC algorithm can be used to measure and collect statistics on signal levels

online so that operators can monitor signal levels and learn the distribution of signal levels to

determine whether to enable the ALC algorithm for cells.

GBSS14.0

The level adjustment performance is optimized.

1. The speech tracing and adaptive capability of the ALC algorithm is optimized so that the ALC algorithm becomes more responsive to situations where the volume changes rapidly.

2. The internal dependencies on a fixed clipping threshold of the ACLP algorithm are canceled so that the clipping threshold is adaptive to signal level changes.

3. A counter is provided to measure the signal level and the number of clipping occurrences.

Dependency


None




5




This feature is mutually exclusive with the following features:

GBFD-118602 A over IP

GBFD-118622 A IP over E1/T1

GBFD-115701 TFO

GBFD-115702 TrFO

GBFD-117701 BSC Local Switch

GBFD-117702 BTS Local Switch


None

1.1.3 GBFD-115602 Acoustic Echo Cancellation (AEC)

Availability


Summary

The AEC identifies and cancels the acoustic echo after comparing the main features of

downlink voice and those of uplink voice after a period of delay.

Benefits

The AEC can reduce the acoustic echo generated by the MS, improving the network voice

quality and user experience.

Description

The acoustic echo refers to the situation that the sound wave from one MS speaker is reflected

to the microphone (MIC) and the speech signal is sent back to the other MS because of the

characteristics of the MS. The acoustic echo generated by the MS is mainly related to the fact

that the MS speaker is too close to the MIC and therefore the sound wave attenuation is

insufficient.

During the call, the input voice from the CN is retained through the AEC module of the TC.

After a period of delay, the remote input voice from the CN is compared with the local voice

from the MS. If the codes of similar characteristics exist, it is considered that the local voice is

the echo of the remote voice. Then, the echo is handled nonlinearly and replaced with comfort

noise. In this manner, the original voice from the MIC is canceled, and therefore user

experience is improved.

Enhancement

GBSS8.1




6

The AEC algorithm performance is optimized.

GBSS14.0

The accuracy of echo identification and cancellation is increased by 10%, which is calculated

by algorithm simulation.

The negative impact of echo cancellation on speech quality is decreased by 15%, which is

calculated by algorithm simulation.

A counter is provided to measure the number of echo occurrences.

Dependency


None







GBFD-115701 TFO

GBFD-115702 TrFO




None

1.1.4 GBFD-115603 Automatic Noise Restraint (ANR)

Availability


Summary

The ANR feature constrains the background noise during the call, reduces the receive level of

the noise, and therefore increases the signal-to-noise ratio (SNR).

Benefits

By suppressing the background noise during the call, the ANR makes the voice clear,

improving user experience.




7

Description

The ANR distinguishes voice information from background noise based on the characteristics

of the input speech signal in different time domains and frequency domains. Then, the ANR

reduces and suppresses the background noise according to a certain algorithm. By reducing

the receive level of the noise and increasing the SNR, the ANR improves user experience

without affecting the authentic voice.

Enhancement

GBSS8.1

The ALC algorithm performance is optimized.

GBSS14.0

The efficiency for suppressing noise of the same type for a second time and suppressing

unstable noise is improved.

The capability to distinguish voice signals and music is significantly improved.

A counter is provided to measure the number of times noise occurs at different levels.

Dependency


None







GBFD-115701 TFO

GBFD-115702 TrFO




None

1.1.5 GBFD-115701 TFO

Availability





8

Summary

With this feature, TFO frames are transparently transmitted and encoding/decoding is

bypassed through the bit stealing scheme between the TCs at two ends. Therefore, the process

of encoding/decoding is reduced once.

Benefits

The speech signals deteriorate with each encoding/decoding. Therefore, using TFO to bypass

encoding/decoding can improve the voice quality. In the case of encoding/decoding of lower

rate, the voice quality is more evidently improved.

Description

For traditional mobile network system without TFO, the voice signal is encoded by the MS on

one side and transmitted over the radio interface. The signal is then decoded by the first TC

unit. The decoded PCM data flow is transmitted to the second TC unit through the 64 kbit/s

transmission link for encoding. After being encoded, the data is transmitted to the MS on the

other side over the radio interface for decoding. During the whole conversation, the speech is

transcoded twice, which is called tandem operation.

The TFO feature can reduce the speech signal degradation caused by tandem operation,

improving the voice quality. When the calling MS and the called MS use the same speech

version, the TFO link is established through the in-band signaling negotiation. In addition, the

least significant bit and the second least significant bit is stolen to seize the 8 kbit/s (or 16

kbit/s) sublink of the PCM transmission link for transparent transmission of TFO frames and

bypass TC encoding/decoding. In this manner, the speech signal is encoded at the MS

initiating the call and decoded at the MS terminating the call for only once. Therefore, the

degradation of the speech signals due to tandem operation is reduced and the voice quality is

improved. This process is called tandem free operation (TFO).

Enhancement

GBSS8.1

The AMR TFO is supported.

GBSS9.0

Transcoding

Function

Transcoding

Function

Transcoding Functions Bypassed

MS/UEMS/UE

PLMN A PLMN B

Encoding DecodingCompressed Speech

MS/UEMS/UE

PLMN A PLMN BTranscoding

Function

Encoding Decoding DecodingEncodingCompressed Speech Compressed SpeechITU-T G.711 A-Law/-Law

Transcoding Functions

Transcoding

Function




9

Conversion between the FR and HR in the TFO: During the negotiation of the TFO, if the

channel (FR or HR) used by the called party is different from the channel (HR or FR) used by

the calling party, the call is handed over from the FR channel to an HR channel before the

TFO. This feature improves the voice quality of the HR call.

GBSS14.0

The number of TFO setup failures and the TFO setup duration are measured. This introduces

new methods for network optimization and maintenance.

Dependency


None




When a call using TFO feature, the following features cannot be used together:

GBFD-115601 Automatic Level Control (ALC)

GBFD-115602 Acoustic Echo Cancellation (AEC)

GBFD-115603 Automatic Noise Restraint (ANR)

GBFD-115703 Automatic Noise Compensation (ANC)

GBFD-115704 Enhancement Packet Loss Concealment (EPLC)

GBFD-115506 AMR Coding Rate Threshold Adaptive Adjustment

GBFD-117702 BTS Local Switch AMR Rate Adaptation Under BTS Local Switch

GBFD-117701 BSC Local Switch AMR Rate Adaptation Under BSC Local Switch



GBFD-115702 TrFO


None

1.1.6 GBFD-115702 TrFO

Availability


Summary

With this feature, the calling MS and called MS use the same speech coding scheme.

Therefore, the speech signal is coded at the calling MS once and decoded at the called MS




10

once. This can solve the problem that the TRAU repeatedly codes and decodes the speech

signal.

Benefits

This feature provides the following benefits:

The TrFO feature enables the calling MS and called MS to use the same speech coding,

which prevents the repeated coding and decoding during the MS-MS call process. This provides better speech quality for users.

In addition, the TRAU is not involved in the TrFO, saving the TC resources.

Description Repeated coding and decoding

In the traditional MS-MS call process where the TFO/TrFO is not adopted, the speech

signal is coded at the calling MS, transmitted on the Um interface, and is then decoded at

the first TRAU. The decoded PCM data flow is transmitted on the 64 kbit/s link to the

second TRAU for coding and is then transmitted on the Um interface to the called MS

for decoding. In the MS-MS call process, the coding and decoding are continually

performed twice. This is referred to as repeated coding and decoding.

Overview of TrFO

The TrFO feature enables the calling MS and called MS to use the same speech coding.

Therefore, the speech signal is coded at the calling MS once and decoded at the called

MS once. This solves the problem of speech signal damage in repeated coding and

decoding, improving the signal quality.

In the GSM network, the coding capability of each cell can be dynamically configured.

The coding scheme of the Um interface is determined by the BSS. When implementing

the TrFO, the MSC server selects the speech version supported by the cells where the

calling MS and called MS are located based on the coding capability of the cells. Then,

the MSC sets the expected speech version to a highest value. In this way, the TrFO can be successfully implemented.

1) The BSC selects the speech version according to the Preferred Codec List carried in the assignment request sent by the MSC.

2) To improve the success rate of TrFO, the BSC sends the Complete Layer 3

Information message carrying the coding schemes supported by the cells to the MSC.

3) To perform the TrFO services on the established calls, the MSC sends the INTERNAL

HANDOVER ENQUIRY message carrying the specified Speech Codec to the BSC to trigger the intra-BSC handover.

Differences between TrFO and TFO

Both TrFO and TFO use the speech compression in the CN. Both features avoid the

repeated code conversions during the MS-MS call and improve the QoS. The two

features, however, are different from each other. TFO is enabled, disabled, and controlled

by the TRAU after a call is established. When the encoder and decoder use the same

coding/decoding scheme, the TFO is enabled to transmit the compressed speech. TrFO,

however, does not require the TRAU. It uses the OoBTC to negotiate the

coding/decoding type of both the calling MS and called MS before the call is established. Then, the compressed speech is transmitted after the call is established.

If the requirement for TrFO is not met, it takes some time to configure the TRAU for

restoring the PCM coding/decoding. Without the TRAU, the call fails. In TFO, however,

the PCM coding is immediately used when the requirement for TFO is not met. Therefore, the speech quality is not affected.




11

Enhancement

None

Dependency


None




This feature depends on the following features:




GBFD-115831 Mute SAIC MS Identification

GBFD-115832 VAMOS Call Drop Solution


The CN must support this feature.

1.1.7 GBFD-115703 Automatic Noise Compensation (ANC)

Availability


Summary

Through the assessment of the background noise of the local end and the speech level of the

peer end, this feature adaptively increases the speech volume of the peer end if the

background noise of the local end is heavy. Therefore, the ratio of the peer end speech to the

background noise of the local end is increased and the speech quality is improved.

Benefits

Good speech quality is a basic requirement for a superior network. It is also the basic

requirement of the customer and helps in testing the product of the equipment manufacturers.

The problems such as acoustic echo, background noise, and packet loss must be solved to

ensure the speech quality. In addition, the gain of the signals should be controlled. Different

manufacturers have different algorithms and features to solve these problems.

Huawei GBSS uses the ANC feature to improve the speech quality in the scenarios with

heavy background noise such as in the downtown, marketplace, and cinema. Therefore, the

user satisfaction is increased and a network with enhanced performance is provided.




12

Description

The ANC compensates the noise through the algorithm. Through the assessment of the

background noise of the local end and the speech level of the peer end, this feature adaptively

increases the speech volume of the peer end if the background noise of the local end is heavy.

Therefore, the ratio of the peer end speech to the background noise of the local end is

increased so that the listener can clearly hear the speaker.

This feature is disabled by default. The ANC threshold is the ratio of the peer end speech to

the background noise of the local end, which can be manually configured. The maximum

adjustment range is the maximum gain of the ANC, which can also be manually configured.

For the speech handling, refer to the ITU-T G.169 specifications.

This feature is a feature of the TC devices and cannot be used together with the TrFO or TFO.

Enhancement

GBSS14.0

A counter is provided to measure the number of times SNRs occur at different levels.

Dependency


None







GBFD-115701 TFO

GBFD-115702 TrFO




None

1.1.8 GBFD-115704 Enhancement Packet Loss Concealment (EPLC)

Availability





13

Summary

This feature applies to the EFR, AMR FR, and AMR HR speech versions.

When the BSS receives the speech coding, the frames of the lost packets can be recovered and

compensated through the algorithm. Therefore, the anti-interference capabilities of the EFR,

AMR FR, and AMR HR speech versions and the speech quality are improved.

Benefits

With this feature, the frames of the lost packets can be recovered and compensated. This, to a

certain extent, solves the problem of speech frame loss during transmission and in a poor

radio environment. Therefore, the speech quality is improved, the user satisfaction is

improved, and a network with enhanced performance is provided.

In the case of packet loss of different severities, the MOS can be increased by 0 to 0.2.

Description

The problems such as acoustic echo, background noise, and packet loss must be solved to

ensure the speech quality. In addition, the gain of the signals should be controlled. Different

manufacturers have different algorithms and features to solve these problems.

This feature uses the patented algorithm to restore the lost frames during the transmission and

in a poor radio environment based on the information about the previous frame. This

implements the compensation for the frames of the lost packets.

This feature is a feature of the TC devices. It is used to process the AMR speech and

controlled by a switch. This feature cannot be used together with the TrFO or TFO because

the TC is not involved in the TrFO or TFO.

Enhancement

GBSS13.0

The packet loss prediction algorithm is optimized so that the received voice gets closer to the

original voice in fidelity, improving user experience.

Dependency


None




This feature depends on the following feature:

GBFD-115501 AMR FR

GBFD-115502 AMR HR

GBFD-113301 EFR





14



GBFD-115701 TFO

GBFD-115702 TrFO



It is recommended that this feature work with the following feature:

GBFD-115603 Automatic Noise Restraint (ANR)


None

1.1.9 GBFD-115711 EVAD

Availability


Summary

This feature helps telecom operators promote their value-added music services.

Benefits

This feature enhances the encoding effect of downlink music (such as ring back tone (RBT)

service and voice information service) that uses the EFR, AMR FR, or AMR HR coding

schemes and therefore improves user experience.

Description

The earlier Voice Activity Detection (VAD) algorithm may consider soft music as silence and

mistakenly encode music in the downlink. This affects user experience.

The Huawei proprietary Enhanced VAD (EVAD) algorithm increases music recognition

accuracy. It greatly reduces the probability that music is mistakenly considered as silence,

improving user experience.

Enhancement

None

Dependency


None






15


This feature depends on the following features:

GBFD-115501 AMR FR

GBFD-115502 AMR HR

GBFD-113301 EFR

GBFD-114801 Discontinuous Transmission (DTX)-Downlink

If EVAD is enabled for a call, the following features cannot be enabled at the same time:

GBFD-115701 TFO

GBFD-115702 TrFO







None

1.1.10 GBFD-116801 Voice Quality Index (VQI)

Availability


Summary

The voice quality index (VQI) feature provides a direct method of measuring the voice quality

of the radio network. By measuring the uplink VQI and downlink VQI, the voice quality of

the network is quantified, which provides a reference for future network optimization.

Benefits

The VQI can measure the voice quality of the network rapidly and effectively and therefore

provide a reference for network optimization.

Description

The VQI establishes the mapping between the radio network performance and voice quality.

The VQI value, which helps learn the voice quality, is calculated based on the parameters

related to the radio quality of the uplink/downlink speech signals. The MOS analysis method

is applied in VQI to measure the voice quality. The MOS is used to assess the quality of the

middle-rate and low-rate voice coding. The MOS value ranges from 1 to 5. Based on the

MOS analysis method, Huawei further divides the voice quality into 11 VQI levels. The VQI

is obtained by analyzing the bit error rate (BER), frame error rate (FER), longest consecutive sequence of frame losses (LFE), and speech codec mode of the uplink/downlink speech signal.




16

In this manner, the voice quality is quantified to facilitate the identification of the voice

problem and network optimization.

Enhancement

None

Dependency


None




None


MSs must support this feature.

1.1.11 GBFD-115708 Um Interface Speech Frame Repairing

Availability


Summary

This feature automatically repairs the bit-error speech frames over the Um interface,

improving the voice quality. The feature is implemented by applying an enhanced decoding

technique to the Um interface.

Benefits

This feature helps improve the voice quality. The improvement is more significant when the

uplink carrier-to-interference ratio (C/I) is low.

Description

When the bit error rate (BER) is high and the C/I is low, voice quality will deteriorate if

bit-error voice frames are discarded. To solve this problem, an enhanced decoding technique

is adopted to repair the erroneous speech frames over the Um interface. This technique

increases the success rate of voice decoding, improving the voice quality under low C/I. After

this feature is applied, the mean opinion score (MOS) can be increased by 0.1 to 0.2 under

low uplink C/I.

Enhancement

None




17

Dependency




None


None


None

1.2 AMR Package

1.2.1 GBFD-115501 AMR FR

Availability


Summary

In a situation where interference is likely to occur, better voice quality can be provided if the

system uses AMR FR. In the same conditions, the voice quality in AMR FR is the same as or

better than the voice quality in EFR.

Benefits

This feature has the following benefits:

Increases the capacity of the system in physical areas.

Enhances the anti-interference capability to adapt to tight frequency reuse.

Improves the network indexes in an increasingly complex radio environment in

combination with the frequency hopping technology.

Provides a better voice quality for the subscriber.

Description

The AMR is an integration of multiple voice encoding/decoding rates. With different

encoding/decoding rates, the voice code streams of different rates are yielded. The AMR

enables the BTS and MS to select an appropriate encoding/decoding algorithm and to adjust

the encoding rate based on the specific radio environment. Therefore, the voice quality of the

entire wireless communication system is improved.

When there is a lot of interference on the radio channels, better voice quality can be provided

in AMR FR than in EFR or FR. In addition, the system in AMR FR has a higher

anti-interference capability to adapt to tight frequency reuse.




18

In the wireless communication system, the higher the original speech rate involved in channel

encoding, the more the information about the speech characteristics carried in the coded

stream and therefore the higher the fidelity of the speech. However, the redundant information

in the coded stream decreases, and therefore the coded stream becomes more interference

sensitive. In a poor wireless communication environment, bit errors occur easily and the

speech frames may be lost. Therefore, voices may be discontinuous. If the original speech rate

involved in channel encoding is reduced, more redundant information is carried in the coded

stream. Then the coded stream has strong anti-interference and error correction capabilities.

Therefore, the continuity of voice can be improved.

The AMR FR provides a selection of multiple coding rates from 4.75 kbit/s to 12.2 kbit/s, as

listed in the following table.

Channel Coding Rate

TCH/AFS 12.2 kbit/s

10.2 kbit/s

7.95 kbit/s

7.40 kbit/s

6.70 kbit/s

5.90 kbit/s

5.15 kbit/s

4.75 kbit/s

Enhancement

GBSS8.1

The anti-interference capability of signaling transmission is enhanced in GBSS8.1.

If the original speech rate involved in channel encoding is reduced, the coded stream can

contain more redundant information. Then the coded stream has stronger anti-interference and

error correction capabilities and the voice continuity is improved as a result. The signaling

transmission performance, however, is not improved. After this feature is enabled, the

transmit power is increased during signaling transmission to increase the success rate of

signaling transmission. This can avoid voice interruption concerned with signaling

transmission in poor radio environment.

GBSS13.0


E-coder improves the AMR FR speech quality by using the filter enhancement technique

during preprocessing and the Linear Spectral Pairs (LSP) exact-calculate technique. In this

way, E-coder increases the Mean Opinion Score (MOS) by 0.05 to 0.12. In A over IP or TFO,

E-coder is not supported.

Dependency





19

None





GBFD-115503 AMR Power Control


The CN and MSs must support this feature.

Professional Service

It is recommended that this feature be used with the AMR feature introduction service.

1.2.2 GBFD-115502 AMR HR

Availability


Summary


system uses AMR HR. In the same conditions, the voice quality in AMR HR is the same as or

better than that in HR. If the AMR HR feature is enabled, the half-rate speech feature must be

enabled at the same time.

Benefits


Increases the capacity of the system in physical areas.

Enhances the anti-interference capability to adapt to tight frequency reuse.

Improves the network indexes in an increasingly complex radio environment in

combination with the frequency hopping technology.

Provides a better voice quality for the subscriber.

Description


system uses AMR HR. In the same conditions, the voice quality in AMR HR is the same as or

better than that in HR. Therefore, if the communication quality meets the requirements, the

AMR HR can be widely used to increase the system capacity. When much interference exists

and the voice quality decreases, the system automatically switches to the AMR FR so that the

voice quality and the system capacity are balanced in real time. In this manner, the system can

provide good voice quality to subscribers when the system capacity is increased.

The following table lists the coding rates provided by the AMR HR.




20

Channel Coding Rate

TCH/AHS 7.40 kbit/s

6.70 kbit/s

5.90 kbit/s

5.15 kbit/s

4.75 kbit/s

Enhancement

GBSS8.1

The TCH/AHS 7.95 kbit/s coding rate is supported in GBSS8.1.

The BTS using the Abis over IP or Abis transmission optimization function can provide the

speech services with the coding rate of AMR HR 7.95 kbit/s. The following table lists

multiple coding rates of the AMR HR.

Channel Coding Rate

TCH/AHS 7.95 kbit/s

7.40 kbit/s

6.70 kbit/s

5.90 kbit/s

5.15 kbit/s

4.75 kbit/s

Enhanced anti-interference capability of signaling transmission: If the original speech rate

involved in channel encoding is reduced, the coded stream can contain more redundant

information. Then the coded stream has stronger anti-interference and error correction

capabilities and the voice continuity is improved as a result. The signaling transmission

performance, however, is not improved. After this feature is enabled, the transmit power is

increased during signaling transmission to increase the success rate of signaling transmission.

This can avoid voice interruption due to signaling transmission in poor radio environment.

GBSS13.0


E-coder improves the AMR HR speech quality by using the filter enhancement technique

during preprocessing and the Linear Spectral Pairs (LSP) exact-calculate technique. In this

way, E-coder increases the Mean Opinion Score (MOS) by 0.05 to 0.12. In A over IP or TFO,

E-coder is not supported.




21

Dependency


None




This feature depends on the following feature:

GBFD-113401 Half Rate Speech


GBFD-115503 AMR Power Control


The CN and MSs must support this feature.



1.2.3 GBFD-115503 AMR Power Control

Availability


Summary

Using different AMR power control algorithms, this feature can provide better

anti-interference capability, larger network capacity, and better voice quality.

Benefits


Reduces the transmit power and prolongs the standby time of the MS.

Reduces the network interference and improves the frequency usage.

Improves the network quality.

Description

The AMR speech coding scheme can select one of the coding rates according to the radio

channel quality to achieve an optimized combination of speech coding rate and channel

coding rate. In this manner, the AMR speech coding scheme can provide the best voice

quality in the current radio environment and meet the communication requirements in various

radio environments. The coded stream contains more redundant information. Then the coded

stream has stronger anti-interference and error correction capabilities and the voice continuity

is improved as a result. The system automatically decides whether to adopt the AMR. If the

system uses the AMR, the power control strategy for the AMR calling is different from that




22

for the non-AMR calling. In this manner, the network interference is reduced, the BTS

transmit power is saved, and the standby time of MS is prolonged.

Enhancement

None

Dependency


None




It is recommended that this feature work with the following features:

GBFD-115501 AMR FR

GBFD-115502 AMR HR


None



1.2.4 GBFD-115504 AMR FR/HR Dynamic Adjustment

Availability


Summary

The AMR FR/HR Dynamic Adjustment feature dynamically adjusts AMR HR and AMR FR

in a cell to balance the cell capacity and voice quality.

Benefits


Less maintenance work is required because the system can automatically adjust the ratio of AMR FR to AMR HR based on the network capacity and quality.

This feature expands the network capacity and reduces the network deployment cost

without degrading the voice quality.




23

Description

The AMR FR/HR Dynamic Adjustment feature dynamically adjusts AMR HR and AMR FR

in a cell to balance the cell capacity and voice quality.

After completing the initial voice coding after setting up a call, the BSS calculates the radio

quality index (RQI) based on the uplink signal quality measured by the BTS. The BSS then

determines the encoding/decoding scheme used for the uplink based on the uplink quality, the

code sets activated by the BSC, and the corresponding thresholds. In addition, the system

dynamically adjusts the voice coding rate in the uplink, and instructs MSs to use the selected

voice coding rate. According to the RQI and parameters such as network capacity, the BSS

determines whether to enable the AMR FR/HR dynamic adjustment in the cell to balance the

voice quality and the cell capacity.

This feature applied in different radio environments and capacity configurations helps to

balance the voice quality and the cell capacity. Before enabling this feature, ensure that the

Half Rate Speech and AMR HR features have been enabled.

Enhancement

None

Dependency


None




None


None



1.2.5 GBFD-115505 AMR Radio Link Timer

Availability


Summary

The radio link timer is used for the detection of the radio link quality. When the timer expires

due to poor radio link quality, the system deactivates the radio channel and interrupts the

conversation. In this manner, the timer can improve the channel utilization and prevent

channels with poor quality from occupying radio channel resources for a long time.




24

Benefits

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Date post:	19-Nov-2015
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GBSS14.0 Optional Feature Description

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