92341079-wide-band.pdf

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AMR-WB - Adaptive Multi-Rate Wideband speech code

Table of Contents

• Introduction• Benefits• Description of the feature• Requirements for using the feature• Parameter settings• Restriction• Test cases carried out in Circle

Copyright © Nokia Siemens Networks 2010 Company confidential (9)

NPO/WBAMR/TTSL-KTK Date: 09.06.20113G WABMR Implementation (RU20) Version 1.0

1 Introduction

The wideband adaptive multi-rate speech codec (AMR-WB) is the only 3GPP standard wideband codec in 2G, 3G, IMS and LTE mobile networks. It can be supported also by some SIP clients in addition to G.711 and VoIP codecs such as iLBC. AMR-WB requires an end-to-end wideband connection because transcoding with a narrowband codec decreases quality to narrowband level in both terminals. An end-to-end connection can be achieved with TFO and TrFO features that are mandatory for AMR-WB calls in the network. TFO is used with TDM-based 2G A or Ater interface and TrFO with 3G Iu-CS, 2G AoIP with TC in MGW, and Mb/IMS/LTE SIP interworking. AMR-WB conference calls and announcements are planned to be supported in a future MSS System release. Nokia Siemens Networks MSC Server supports the enhanced voice activity detection (eVAD) feature for 3GPP mobile codecs. This feature provides a better on-line music experience also with AMR-WB calls. AMR-WB offers a possibility to use HD (High Density) Voice Service.

2 Benefits

Improvement of quality of service

AMR-WB provides superior speech quality compared to narrowband mobile codecs and even better speech quality than fixed networks with the G.711 codec. Subscriber satisfaction can also be increased by better speech intelligibility because of the wideband frequency used (50 - 7000 Hz compared to 200 - 3400 Hz with narrowband codecs).

Improvement of resource management

AMR-WB requires more MGW processing capacity compared to narrowband codecs. However, the TrFO feature provides optimized MGW capacity usage both for narrowband and AMR-WB calls.Operators interested in AMR-WB in the 2G network may find it useful to invest in AoIP with TC in MGW architecture and TrFO instead of TFO with a legacy TDM network. In this case the TrFO functionality can be used in 2G, 3G networks and SIP networks, when TFO/TrFO interworking is needed for 2G-3G.The AoIP with TC in MGW provides additional CAPEX and OPEX savings by an optimized architecture because separate TC elements are not needed, and IP bandwidth savings by transporting a compressed mobile codec over IP.

HD Voice Service

High Density (HD) Voice service will be a business opportunity for operators enabling differentiation in competition and additional charging. MSC Server support AMR-WB specific subscriptions and Call data record (CDR) data

Subscriber benefits

AMR-WB provides enhanced speech quality. This provides more natural speech, pleasantness and feeling of presence and transparency, as well as better speaker recognition and intelligibility.



3 Description of the feature

AMR-WB is a wideband codec standardized by 3GPP, and supports 50-7000 Hz audio frequency with 16 kHz sampling compared to 200-3400 Hz and 8 kHz used in narrowband codecs. AMR-WB consists of nine speech codec modes with bit rates of 6.6, 8.85,12.65, 14.25, 15.85, 18.25, 19.85, 23.05, and 23.85 kbit/s. The lowest bit rate that provides excellent speech quality in a clean environment is 12.65 kbit/s. Higher bit rates are useful for music and in conditions with background noise. Also lower bit rates of 6.60 and 8.85 kbit/s provide a reasonable quality, especially compared to narrowband codecs.

3GPP has specified three different AMR-WB configurations to simplify the negotiation of used bitrate between the handset, RAN, and core network:

• Configuration A: 6.6, 8.85, and 12.65 kbit/s (mandatory multi-rate configuration)

• Configuration B: 6.6, 8.85, 12.65, and 15.85 kbit/s

• Configuration C: 6.6, 8.85, 12.65, and 23.85 kbit/s

The MSC Server system supports all 3GPP configurations, but Nokia Siemens Networks 2G BSS and 3G RAN currently only support Configuration A.



Parameters

MGW parameters:

AMR-WB has to be included in MGW codec pool. In MGW based on IPA2800, the Configurable Dynamic Signal Processing Platform (CDSP) plug-in units CDSP-C and CDSP-D require a dedicated wideband pool. CDSP-DT (introduced in U4.2) supports common pool for all codecs when codec specific configuration is needed.

In Open MGW, the DSP blade (ADSP) supports common pool for all codecs when codec specific configuration is needed.

MSS parameters:

• WB-AMR License parameter:This is the license parameter for AMR-WB.• Success and answer traffic in TCAT measurement If FIFILE parameter is active, counters

SUCC_TR and ANSW_TR appear in Traffic category measurement.• WBAMR capability in route selection :-This MSS level parameter determines, whether the

AMR-WB capability of the route is checked at route selection phase.• Priority of WB-AMR and LBCU in route selection:- This MSS level parameter determines

which route parameter (LBCU or AMR-WB) has priority at route selection phase, if both are available.

• Transcoder Free Operation functionality :-This MSS level parameter determines whether the MSC server TrFOfunctionality is in use or not

If FR_AMR_WB support is needed towards legacy BSC or towards an AoIP capable BSC with TDM transport type on A interface, then the eTFO feature is needed as well: Enhanced eTFO and TrFO Improvements parameter.

Software Requirement

The AMR-WB speech codec is a licensed optional feature in MGW and MSS. Licenses need to be purchased before feature can be used.

Availability of AMR-WB is also required in BSS and RAN.In addition, licenses for TFO and TrFO need to be purchased. The TFO and TrFO features must also be available in BSS and RAN.AMR-WB subscription and CDR data are optional features in MSS.

Hardware

There are no additional hardware requirements for using this feature, but MGW capacity must be dimensioned according to the estimated number of AMR-WB calls.



Handset requirement

In order to achieve AMR-WB voice quality, AMR-WB codec support is required in mobile handsets, BSS, RAN, MSS, and MGW. Some AMR-WB capable terminals are already available in the market. AMR-WB will be supported in most future Nokia terminals, but will require request from Nokia to be activated in required mobiles. It is expected that also other terminal vendors will introduce AMR-WB-capable terminals.

Capacity

AMR-WB codec requires additional processing in MGW and lower capacity compared to narrowband AMR calls with TrFO. However, MGW capacity for AMR-WB with TrFO is higher than with transcoded narrowband AMR calls.

Restrictions

MSC Server system supports all 3GPP configurations but Nokia Siemens Networks RAN only supports Configuration A up to 12.65 kbit/s.

Wide band AMR Implementation in Live Network

Location :- banglore KTK

No of Sites :- Cluster of 10 sites enabled with WBAMR

Software Version required for W Amr Implementation. Along with RNC License for WAMR support

SW REQUIREMENTNODE-B 3.0 or later versionsRNC PP2.1 or MP3

Parameter Changes required for W amr implementation

Parameter changesMSS Trfo = Enabled , with configuration done at MSS for WB amr Node-B CSAMRModeSETWB

No other parameter changes required apart from the above , only additional parameter required will be Handover parameter which will be used during Inter System handovers.

Steps required for WAMR Implementation and testing

1. Open the RNW Measurement Management application.2. Open the RNW Measurement Management application3. Activate M1002 Traffic measurement.( Wait until the measurement data collection starts, for

example, wait 15 full minutes if 15-minute interval is used.)



4. Make one UE to UE call (using Wideband AMR capable UEs) with the following parameter settings

5. Make one UE to UE call (using Wideband AMR capable UEs) with the following parameter settings

6. Wait until the measurement data gets collected, for example, wait 15 full minutes if 15-minute interval is used.

7. Open the RNW Measurement Presentation application and check the following counters of M1002 Traffic measurement:

8. Open the RNW Measurement Presentation application and check the following counters of M1002 Traffic measurement: :- M1002C487 – M1002C500

Counters to be checked post WAMR for functionality

Counter Counter NameM1002C487 DCH ALLO FOR WAMR 12.65 KBPS IN SRNCM1002C488 DCH ALLO FOR WAMR 6.6 KBPS IN SRNCM1002C489 DCH ALLO DURA FOR WAMR 12.65 KBPS IN SRNCM1002C490 DCH ALLO DURA FOR WAMR 6.6 KBPS IN SRNCM1002C491 DCH ALLO FOR WAMR 12.65 KBPS IN DRNCM1002C492 DCH ALLO FOR WAMR 8.85 KBPS IN DRNCM1002C493 DCH ALLO FOR WAMR 6.6 KBPS IN DRNCM1002C494 DCH ALLO DURA FOR WAMR 12.65 KBPS IN DRNCM1002C495 DCH ALLO DURA FOR WAMR 8.85 KBPS IN DRNCM1002C496 DCH ALLO DURA FOR WAMR 6.6 KBPS IN DRNCM1002C497 DCH MOD DUE TO SWITCHING FROM WAMR TO NAMR IN SRNCM1002C498 DCH MOD DUE TO SWITCHING FROM NAMR TO WAMR IN SRNCM1002C499 DCH MOD DUE TO SWITCHING FROM WAMR TO NAMR IN DRNCM1002C500 DCH MOD DUE TO SWITCHING FROM NAMR TO WAMR IN DRNC

Test cases performed during Drive test

S No Test Cases Date

Status Remarks

1

Verify CS Voice Call MO-MT between one WB-AMR UE in 3G and another WB-AMR capable UE in 2G Coverage when RNC and BSC are connected to same MSS

7/3/2011

SUCCESS

WB-AMR 3G to 2G calls success. A number using codec is UMTS AMR WB ( 6.60 ) and B number G711 A.WB-AMR 2G to 3G calls success. A number using codec is G711 A and B number UMTS AMR ( 4.75 ).

2

Verify CS Voice Call MO-MT between one WB-AMR UE in 3G and one NB-AMR UE in 2G coverage when RNC and BSC are connected to same MSS

7/3/2011

SUCCESS

WB-AMR 3G to NB-AMR 2G calls success. A number using codec is UMTS AMR WB ( 6.60 ) and B number G711 A.

NB-AMR 2G to WB-AMR 3G calls success. A number using codec is G711 A and B number UMTS AMR ( 4.75 ).



3 Verify Initial Codec Rate selection - WB-AMR Single Rate (6.6 kbps)

7/3/2011

SUCCESS

Initial Codec rate is coming as 6.60kbps

4Verify WB-AMR Code Mode control (dynamic allocation of rate w.r.t. coverage conditions)

7/3/2011

SUCCESS

No change in codec while roaming in coverage area

5

Verify WB-AMR CS Voice Call 3G to 2G Inter RAT Handover (2G RAN does not support WB-AMR); verify that other codec is selected in GSM

7/3/2011

SUCCESS

WB-AMR 3G call handover to 2G network is successful with changing codec G711 A .

6

Verify WB-AMR CS Voice Call 2G (GSM AMR / EFR / FR / HR) to 3G Inter RAT Handover (2G RAN does not support WB-AMR)

7/3/2011

SUCCESS

Ho was happening , parameter to be changed in order to trigger GSM to UMTS ho on load conditions

Logs captured during WB AMR

IMSI : 405034030109180

IMEI : 3537550495227303

RADIO SYSTEM : UMTS -

CGR/BSC/PCM-TSL : / / - 1381/ /4048-08

MCC/MNC : 405 /034 /

LAC/CI/CELL BAND : 10005/22246/WCDMA / /

RNC ID : 00005

ROUTING CATEGORY : 11

MGW INDEX : 25 25

MGW NAME : VMGW0426 VMGW0426

BNC CHAR : IPv4 TDM

UPD INDEX/NAME : 10 /UPDRNC05MGW03 /

SPTD CODEC LIST : UMTS AMR / UMTS AMR 2

UMTS AMR WB

RAB ID : 1

MAX BIT RATE : 12.65

GRTD BIT RATE : 6.60

A LOCAL IP ADDRESS: 10.122.180.81

PORT : 63426



TDM TERMID : 3360-8

NORMAL CTX ID : 89081167 89081167

USED CODEC : UMTS AMR WB G711 A

MODES LIST : 6.60 8.85 12.65

Terminals used during testing

Nokia C7

Nokia N8

Nokia N85

Codec Mode Set Available in MSS



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