featurereport_faj_121_1517_1381 - amr multimode low rate

WCDMA RAN W11A AT&T FOA:

AMR MULTIMODE Low rate

FAJ 121 1381

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W11A Feature Report for AMR MULTIMODE LOW RATE - FAJ1211381 RAN W11A FFA ATT USA | 4/0363-FCP 121 4765 Uen, Rev PA1 | 2011-03-22 |

content (1/2)

1. Feature Description› Introduction› AMR Multimode Low Rate Feature Description› AMR Multimode Low Rate Key Benefits› Feature Dependencies› Related Counters› Related Parameters

2. Field Test Results› Expectations› Field Test

› Field Test Overview› Field Results Summary› Field Results Details› Conclusions


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content (2/2)

3. Feature Activation› Activation Procedure› Activation Requirements› Activation Considerations

4. AMR Multimode Low Rate TRs

5. Final Conclusion and Recommendation› Achievements› Conclusion› Recommendation

6. Backup slides› Reference material› AMR Multimode Low Rate lab testing


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introduction

› The feature AMR multimode multi-rate introduces new RAB combinations with SF 256 to give benefits of higher SF when there is a shortage on codes. The feature AMR multimode low rate and PS HSPA Interactive RAB Combination, introduces the following:

- AMR multimode (5.9, 4.75) with SF 256 (UeRc=79)- AMR multimode (5.9, 4.75/5.9, 4.75) + PS Interactive (0/0) + SRB (3.4/3.4)

with SF 256 (UeRc=80)- AMR multimode (5.9, 4.75/5.9, 4.75) kbps + Interact. PS (EUL/HS) kbps

(UeRc=176)

› Support of AMR MM low rate with SF 256 in combination with PS Interactive (EUL/HS) enables lower resource consumption of DL codes compared to existing combination with Speech 12.2 + PS Interactive (EUL/HS).

› AMR multimode (5.9, 4.75/5.9, 4.75) kbps + Interact. PS (EUL/HS) kbps RAB combination will have support for Enhanced Uplink 2ms TTI (FAJ 121 1317), Enhanced Layer 2 (FAJ 121 1328), 64QAM (FAJ 121 1331) and Support for 2x2 MIMO (FAJ 121 1318) as well as SRB (3.4/3.4) kbps.

Feature Description


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› Two new RAB combinations for AMR multimode multi-rate are supported with SF 256 to give the benefits of higher SF when there is a shortage on codes:–AMR multimode (5.9, 4.75) with SF 256 (3GPP 25.993, 7.1.12a) –AMR multimode (5.9, 4.75) + PS Interactive 0/0 with SF 256

› When other RABs are added to the AMR NB Multimode Low-rate combinations, the resulting multi-RAB combination will be based on AMR NB Multimode Multi-rate (12.2, 7.95, 5.9, 4.75) with the AMR rate limited to 5.9.


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› Key benefits› This feature provides two new RAB combinations for AMR

multimode multi-rate are supported with SF 256 to give the benefits of higher SF when there is a shortage on codes


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AMR multi mode low rate› Use of lower spreading factor on DL for two lowest rates– 5.9 kbps and 4.75 kbps› SF256 instead of SF128

– 1 CE consumption in UL and DL (Not changed)– On downlink and uplink:› Speech rate chosen based on load at RAB establishment

– On uplink:› Speech rate changed

based on coverage ***

› Benefit:– Improved code utilization efficiency– Increase capacity in code limited

situations

Speech rate due to coverageAMR 4.75 – 5.9

Speech rate based on loadAMR 4.75 – 5.9

*** Coverage triggered rate change works on uplink during the call. The process relies on UE feature: “Transport Format Combination Selection in UE” per 3GPP TS 25.321 (UL rate is autonomously controlled by the UE). Although we see one UE vendor using event 6d as the choice of design for uplink rate


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AMR Multimode Low Rate› For other RAB combinations:–Reconfiguration to normal RAB for multi mode AMR speech

Vocoder rate 5.9 kbps

4.75 kbps

PS Interactive 0/0

AMR multimode (5.9, 4.75)+

SF 256

AMR multimode (5.9, 4.75)

Vocoder rate 5.9 kbps

4.75 kbps

Lower resource consumption

UeRc=79

UeRc=80


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AMR multi mode low rate

› Implementation/Prerequisites– License key needs to be activated:

› RncFeature=RabCombination=79› RncFeature=RabCombination=80

– FAJ 121 985, Conversational RAB for multi mode AMR Speech, activated (RncFeature=AmrNbMultiMode featureState)– To support Iu User Plane version 2 for the low rate combinations, the FAJ

121 1378 (TrFO Support for AMR Multimode) is required– To benefit from the higher spreading factor the UE must support the AMR

multimode (5.9 and 4.75) combinations

› Considerations– Set codeLoadThresholdDlSf128 = 0 always enable SF256 RABs (UeRc=79&80) to

be selected– The release of the UE should be >= the parameter

RabHandling.amrNbMmUeRelease.


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AMR multi mode low rate

› GPEH Events– In case of INTERNAL_RAB_ESTABLISHMENT events

“EVENT_PARAM_SOURCE_CONNECTION_PROPERTIES” and “EVENT_PARAM_TARGET_CONNECTION_PROPERTIES” has been updated to include new RAB combinations

› Counters– Applicable UeRc counters (UeRc 79 & 80)

› The complete structure of this new RAB can be found in 3GPP Technical Specification 25.993, 7.1.12a

› For other RAB combinations, a reconfiguration to the feature Conversational RAB for multi mode AMR speech radio bearer (12.2, 7.95, 5.9, 4.75) will occur

AMR multi mode low rate and HSPA PS Interactive RAB combination

FAJ 121 1517


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SF 256 RAN

PScore APN

CScore

PSTNVoice5.9, 4.75

+HSPA


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› AMR multi rate (5.9, 4.75) kbps speech –SF256 instead of SF128– 1 CE consumption in UL and DL (Not changed)–On downlink and uplink:› Max speech rate chosen based on load at RAB establishment› Lower rate can be used at any time

- E.g. device can change speechrate based on coverage

› Benefit:– Increase capacity in

code-limited situations› More voice and data

Speech rate due to coverageAMR 4.75 – 5.9

Speech rate based on loadAMR 4.75 – 5.9



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Dependencies: › FAJ 121 1381 AMR multi mode low rate › FAJ 121 1335, Speech 12.2 kbps and HSPA PS interactive RAB

combination › Requires RAX/TX RBS Base Band HW. Support for DUW RBS

Base Band HW will come in a later release.› Licensing

› Parameters: RabHandling::edchTti2SpeechEnabled

Turning on/off the use of 2 ms TTI for the enhanced uplink together with speech.

Conv. CS speech (5.9, 4.75/ 5.9, 4.75) + Interact. PS (EUL/HS) + SRB (3.4/3.4)

RabCombination176


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Feature dependencies

› The AMR Multimode Low Rate feature, FAJ 121 1381, is an optional feature and the license key needs to be activated. – It is also a prerequisite to have the feature key for FAJ 121 985,

Conversational RAB for multi mode AMR Speech, activated

› FAJ 121 1517 requires:– FAJ 121 1381 AMR Multimode low rate

– FAJ 121 1335 Speech 12.2 kbps and HSPA PS Interactive RAB combination– The corresponding AMR NB single-rate/multi-rate RAB combination

should be enabled (that is UeRc 123) to get a proper system behavior.


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related Counters (1/2)

› UeRc Counters – 79 Conv. CS speech (5.9, 4.75/5.9, 4.75) + SRB (3.4/3.4)– 80 Conv. CS speech (5.9, 4.75/5.9, 4.75) + Interact. PS (0/0) + SRB

(3.4/3.4)– 123 Conv. CS Speech 12.2 + Interact. PS (EUL/HS)– 124 Conv. CS Speech 12.2 + 2 * Interact. PS (EUL/HS) – 125 Conv. CS Speech 12.2 + 3 * Interact. PS (EUL/HS) – 128 3 * Interact. PS (EUL/HS) – 176 Conv. CS Speech (5.9, 4.75/5.9, 4.75) + Interact. PS (EUL/HS)

› pmSumRabEstablish


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related parameters (1/3)

› FAJ 121 1381 - AMR Multimode low rate.– set RncFeature=AmrNbMultiMode featureState 1

› UeRc=79 (RncFeature=RabCombination=79) › UeRc=80 (RncFeature=RabCombination=80) › UeRc=176 (RncFeature=RabCombination=176)› Set amrNbSelector to 1 (multirate) from MO UtranCell

set UtranCell=cellxx amrNbSelector 1› Set :– set utrancell=xxx codeLoadThresholdDlSf128 x(If the code load is above this threshold, the SF256-based codec will be

chosen; otherwise the SF128-based codec will be chosen. Expressed relative to the total code load. Only applicable when establishing an AMR-NB multi-mode RAB)


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Related parameters (2/3)

› UniSaalTp maxSduSize should be set to 1024 for the unisaal dedicated on the RNC and the RBS.

› e.g.:–UniSaalTp=b<>db maxSduSize 1024–UniSaalTp=b<>da maxSduSize 1024


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Related parameters (3/3: 2ms TTi tcs)› The following RBS parameter settings are required:

– NodeBFunction featureStateEul2msTti =1 – NodeBFunction featureStateGrake =1 – NodeBFunction eulMaxAllowedSchRate = 6016 – NodeBFunction eulMaxShoRate = 5760 – NodeBFunction eulNonServHwRate = 384 – RbsLocalCell maxUserEHichPowerDlTti2 = -123 – RbsLocalCell maxEAgchPowerDlTti2 = -123 – RbsLocalCell eulMaxOwnUuLoad = 80 – RbsLocalCell eulMaxRotCoverage = 100

› The following RNC parameter settings are required:– PowerControl transmissionTargetErrorTti2 = 20 – PowerControl ulInitSirTargetEdchTti2 = 30 – PowerControl sirMaxTti2 = 173 – PowerControl ulSirStepTti2 = 5 – UtranCell eulServingCellUsersAdmTti2 = 4

Field test results


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expectations

› This feature provides support for AMR Speech multimode (5.9, 4.75) with SF 256 coded speech, and an interactive RAB on Enhanced Uplink and HSDPA RAB for PS data.

› UeRC=79,UeRc=80, UeRc=176 RAB combinations enable lower resource consumption of DL codes compared to existing combination with Speech 12.2 and PS Interactive (EUL/HS).

› These RAB combinations give the benefits of higher SF when there is a shortage of codes.

Field test observations


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Field test overview

› Timeframe: 02/18/2011 – 02/21/2011

› Location: Dallas, TX

› Nodes/SW: See table below

FOA Zone Software Status

Node Type Software Level

CRTNTXLYRNC005 RNC W11A

CRTNTXLYRNC006 RNC P7FP

DXU6088 & DXU1185 RBS W11A

DXU0119 & DXU1103 RBS P7FP


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Field testing

› UE used was a QUALCOMM 7200 with BREW build› Testing was split into two different geo-graphical

locations– DXU6088 TCs executed:› AMR_M_01› AMR_M_02› AMR_M_03


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Area Tested (1/2)› Whereas throughput improvement happened as expected, some parameter

tuning was necessary in order to mitigate accessibility degradation resulting from 2ms TTI coverage limitations. Also, an effort was made in order to improve retransmission rate.

› Parameter changes were executed and measurements were taken from a 5 RBSs control cluster: CTU2009, CTU2225, CTU5525, CTU2034, CTU5105.

Control Cluster


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Field testing contd.

› UE used was a QUALCOMM 7200 with BREW build› Second test location:– DXU1185 TCs executed:› AMR_M_05› AMR_M_06› AMR_M_07› AMR_M_09› AMR_M_10


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Area tested (2/2)


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Field testing: over iur

› IuR HO from CRT5(DXU1185) to CRT6(DXU1103)

– AMR_M_04: Multi-RAB CS speech (5.9, 4.75/5.9, 4.75) kbps + Interactive PS (EUL/HS) Handover mobility from W11A towards P7FP.

– AMR_M_08: Multi-RAB CS speech (5.9, 4.75/5.9, 4.75) kbps + Interactive PS (EUL/HS) Handover mobility from W11A towards P7FP.


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W11A – P7FP iur Tcs


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KPI impactUerc79 traffic starts showing up (shifting

from Uerc 2)

Cluster level chart RNC level chart

UeRC 79 Conv. CS speech (5.9, 4.75/5.9, 4.75)

Cluster of cells MM-MR Conv

UeRC 79 Conv. CS speech (5.9, 4.75/5.9, 4.75)



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CRT5 MM-MR RAB Activation 3/7

› DL Channel codes utilization slightly increased after the MM activation, than decreased to normal after Uerc79 turned on.

Cluster level chartUeRC 79 Conv. CS speech (5.9, 4.75/5.9, 4.75)



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KPI impact

› GPEH results per cluster: UERC 2 (Speech); UERC 34( AMR 5.9); UERC 79( 4.75,4.75/5.9,5.9+SRB3.4)


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Conclusions

› There is a shift of traffic from UeRC=2 as other AMR rates are being utilized

› From KPIs it was observed DL Channel codes utilization slightly increased after the MM activation, than decreased to normal after Uerc79 turned on.

› There is an improvement overall in better code utilization

Feature Activation


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Feature Activation Procedure

› FAJ 121 1381:– The license key for each low-rate RAB combination shall be

activated. In addition it is required that the corresponding AMR NB single-rate/multi-rate RAB combination is enabled to get a proper system behavior. That is UeRc 2 and UeRc 9 should be enabled for these new low-rate RAB combinations.

› FAJ 121 1517:– It is a prerequisite to have the feature keys for FAJ 121

1381, AMR Multimode low rate, and for FAJ 121 1335, Speech 12.2 kbps and HSPA PS Interactive RABcombination, activated. The feature itself shall be ordered and the license keys shall be installed. – The license key shall be activated. The

corresponding AMR NB single-rate/multi-rate RAB combination should be enabled (that is UeRc 123) to get a proper system behavior.

AMR MULTIMODE Low rate TR’s


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Description / Impact CSR / TriggerDuration

(Min)Remedy Solution / RCA Status Cause

No UL speech frames received for a time period from Samsung I897 at establishment of AMR NB MM Low-rate/multi-rate with maximum rate restrictions towards Samsung A737. This causes one-way speech

1663105HN89364

2-5 mins

No work-around in RAN is possible for this UE fault, but it is possible to restrict this UE from using AMR NB MM multi-rate/low-rate in the CN. This can be done based on the IMEI

Issue identified.RCA completed

This is a UE fault where the I897 does not transmit speech frames in the UL after the initial setup of the speech RAB

Preliminary RCA for TR HN89364, One way voice when on Sp + R99/HS

Cheat Sheet SummaryFault Monitoring

Cheat Sheet SummaryFault Identification

Cheat Sheet SummaryRecovery Procedure

N/A N/A N/A

RNC


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Customer/System Impact: One way speech with specific terminals Samsung I897 and A737

Node Type/Configuration: CRLT5 / RNC 3810

System Impact: None, the impact is on the user experience.

Fault trigger: Samsung i897 outgoing call at establishment of AMR MM MR (UeRC79 Activated) towards Samsung A737

Fault Frequency: Always

Found in: W11A CU1 IP3

Problem exists in AT&T P7FP S/W?: No

Fix Planned for: N/A

Root cause:

This is a UE fault where the I897 does not transmit speech frames in the UL after the initial setup of the speech RAB. From the traces taken nothing wrong in the RAN behavior can be seen. The signaling at the setup of the RAB is correct and the RB Setup is accepted by the UE. No exceptions are raised from the RNC point of view for this situation. Everything looks normal except that no speech frames are received in the UL.Similar fault has been seen on W10A with the Samsung Galaxy model and which was supposed to be fixed on SW Froyo Adroid 2.2

The fault scenario is as follows: Samsung I897 will not transmit speech frames in the UL for a period at initial speech establishment of AMR NB MM low-rate/multi-rate if maximum rate restrictions are included in the Radio Bearer Setup message. After a time period (few seconds - few minutes) the UE will start to transmit UL speech frames again. This will happen for any configuration at initial establishment of the Speech RAB with maximum rate restrictions, i.e. at establishment of a single speech RAB or at establishment of a speech RAB leading to a multi-RAB configuration. This has never been seen when establishing a packet bearer which causes a reconfiguration of the Speech RAB to include maximum rate restrictions (i.e. from low-rate to multi-rate with maximum rate restrictions). This will happen independently if I897 is originating or terminating the call. There is also an end-to-end relation as there is a relation to the other terminal that the I897 is talking to - it has been observed to occur when the other terminal is a A737.

Key Learning: › Design: N/A›Test & Verification: N/A

RNCPreliminary RCA for TR HN89364One way voice when on Sp + R99/HS

Final conclusions and recommendations


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achievements

› The expectations from this feature were demonstrated successfully

› It was shown that this feature improves the code utilization as a higher spreading factor is used than for the corresponding AMR NB MM multi-rate configurations introduced earlier. In code limited scenarios it allows for more speech users and/or for more codes for data traffic. This feature introduced UeRc Ids 79 and 80, and 176.

›


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Conclusion

› This feature demonstrated usage of SF 256 when there is a shortage on codes.

› Field testing showed the different UeRCs introduced by this feature:- AMR multimode (5.9, 4.75) with SF 256 (UeRc=79)- AMR multimode (5.9, 4.75/5.9, 4.75) + PS Interactive (0/0) + SRB

(3.4/3.4) with SF 256 (UeRc=80)- AMR multimode (5.9, 4.75/5.9, 4.75) kbps + Interact. PS (EUL/HS)

kbps (UeRc=176)

› It was shown by KPI performance graphs that there is a lower resource consumption of DL codes

› It was also shown that AMR multimode (5.9, 4.75/5.9, 4.75) kbps + Interact. PS (EUL/HS) kbps RAB combination will have support for Enhanced Uplink 2ms TTI (FAJ 121 1317) by executing Testcases AMR_M_07, AMR_M_08, AMR_M_09

Backup slides


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Reference Material

› TI:

Microsoft Word Document

AMR MULTIMODE Low rate Field testing test cases


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Test number Test Case

Comments

AMR_M_01RAB Establishment of AMR NB MM (5.9, 4.75/5.9, 4.75)

Passed 2/18/2011 on CRTNTXLYRNC005\DXU1185

AMR_M_02RAB establishment of AMR NB MM (5.9, 4.75/5.9, 4.75) + Interactive PS

(0/0) + SRB (3.4/3.4) Passed 2/18/2011 on CRTNTXLYRNC005\DXU1185

AMR_M_03RAB establishment of CS speech (5.9, 4.75/5.9, 4.75) kbps + Interactive PS

(EUL/HS) Passed 2/18/2011 on CRTNTXLYRNC005\DXU1185

AMR_M_04Multi-RAB CS speech (5.9, 4.75/5.9, 4.75) kbps + Interactive PS (EUL/HS)

Handover mobility from W11A towards P7FPPassed 2/21/2011 on CRTNTXLYRNC005\DXU1185 and

CRTNTXLYRNC006\DXU1103


IFHO mobility Passed 2/21/2011 on CRTNTXLYRNC005\DXU1185

AMR_M_06Multi-RAB CS speech (5.9, 4.75/5.9, 4.75) kbps + Interactive PS (EUL/HS) to

Multi-Rab CS speech 12 kbps + 2* Interactive PS (EUL/HS) Passed 2/19/2011 on CRTNTXLYRNC005\DXU1185

AMR_M_07RAB establishment of CS speech (5.9, 4.75/5.9, 4.75) kbps + Interactive PS

(EUL/HS) Passed 2/21/2011 on CRTNTXLYRNC005\DXU1185


Handover mobility from W11A towards P7FPPassed 2/21/2011 on CRTNTXLYRNC005\DXU1185 and

CRTNTXLYRNC006\DXU1103


IFHO mobility. Passed 2/18/2011 on CRTNTXLYRNC005\DXU1185

AMR_M_10Multi-RAB CS speech (5.9, 4.75/5.9, 4.75) kbps + Interactive PS (EUL/HS) to

Multi-Rab CS speech 12 kbps + 2* Interactive PS (EUL/HS) Passed 2/18/2011 on CRTNTXLYRNC005\DXU1185

AMR MULTIMODE Low rate Field Test cases


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featurereport_faj_121_1517_1381 - amr multimode low rate

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