November 24th , 2011

NB AMR Activation in NSN RAN

Introduction:

NB-AMR was implemented on 24th of Aug 2011 in all Wind network. This report shows:

• The feature is working properly in all RNCs. By showing the lower NB-AMR Codecs penetration in both RNC and cell levels.

• The parameters that were tuned in order to improve HSDPA/Voice AS Failures that are due to lack of DL power.

• The most important parameters for NB-AMR activation and tuning.• The most important counters of the feature test.

NB-AMR Codecs utilization RNC level (Weekly resolution)

The Lower NB-Amr codec penetration in NSN RNCs are (on weekly resolution):

20% in TOR1 RNC4% in OTT RNC1% in TOR2 RNC.

NB-Amr Activation

NB-AMR Codecs utilization RNC level (Hourly resolution)

The Lower NB-Amr codec penetration in NSN RNCs are (on hourly resolution):

30% in TOR1 RNC6% in OTT RNC4% in TOR2 RNC.

NB-AMR Codecs utilization Cells level

Weekly Resolution Hourly Resolution

Lower NB-AMR Codecs penetration is 30% average daily and 50% hourly.

NB-Amr Activation

LoadBasedAMRCodecMode: This parameter enables/disables the feature Load based AMR codec mode selection.

CSAMRModeSET: This parameter defines the AMR mode sets used in UTRAN for the CS AMR call. AMR codec sets (12.2), (12.2, 7.95, 5.90, 4.75) and (5.90, 4.75)

AMRTargetSC: This parameter defines the target threshold for the downlink spreading code load. The downlink spreading code load is defined as a quotient of reserved and all spreading codes in the spreadingcode tree on level SF=128. The Load Based AMR Codec Mode Selection feature uses the target threshold.If there are HS-PDSCH codes reserved from the code tree, those HS-PDSCH codes that exceed the minimum number of HS-PDSCH codes are not considered as reserved ones in terms of spreading code load. Default value= 70%.

AMRUnderSC: This parameter defines the underload threshold for the downlink spreading code load. Default value= 50%.

AMROverSC: This parameter defines the overload threshold for the downlink spreading code load. Default value= 90%.

NB AMR Parameters (1/2).

AMRTargetTxNonHSPA: This parameter defines the offset that is used to calculate the target threshold of PtxnonHSPA. The target threshold for PtxnonHSPA is PtxTarget+AMRTargetTxNonHSPA. The Load Based AMR Codec Mode Selection feature uses the target threshold. Default value= -1 dB.

AMRUnderTxNonHSPA: This parameter defines the offset that is used to calculate an underload threshold of PtxnonHSPA. Default value= -10 dB.

AMROverTxNonHSPA: This parameter defines an offset that is used to calculate the overload threshold of PtxnonHSPA . Default value= 0 dB. AMRTargetTxTotal: This parameter defines the offset that is used to calculate the target threshold of PtxTotal. The target threshold for an average total transmitted wide band power is PtxTarget + AMRTargetTxTotal. The Load based AMR Codec Mode Selection feature uses the target threshold. Default value= 0 dB.

AMRUnderTxTotal: This parameter defines the offset that is used to calculate the underload threshold of PtxTotal. Default value= -10 dB.

AMROverTxTotal: This parameter defines the coefficient which is used to calculate the overload threshold of PtxTotal. Default value= 2 dB.

NB AMR Parameters (2/2).

TxPower Load based AMR usage Cells level

Weekly Resolution Hourly Resolution

NB-Amr Activation

60W with FRIE

Week-end

Code Load based AMR usage Cells level

After 60W implementation, the Code based Load has

increased after clearing the TxPower limitation

Most of AMR lower codecs are triggered by TxPower load rather than Code load.

Parameters tuning

The bellow parameters were changed on OTR0080_C (High HSDPA AC Failures fur to loack of DL pwr) and OTR0695_B (High Voice AC Failures due to lack of DL pwr)

In OTR0080_C, the objective of the change was to free up more power to HSDPA.

In OTR0695_B, the objective was to use lower the target Tx power load to use lower codecs in advance in order to accept more users.

Both changes haven’t shown the expected results. We will continue on working on the parameters tuning in order to improve the

HSDPA and Voice CSSR.

Cell Change Type Existing Proposed WO Implementation

OTR0080C AMRTargetTxNonHSPA -1 -3 CH25444 9 Nov 2011, 1 pm

OTR0080C AMRTargetTxTotal 0 -2 CH25444 9 Nov 2011, 1 pm

OTR0695B AMRTargetTxNonHSPA -1 -3 CH25444 9 Nov 2011, 1 pm

OTR0695B AMRTargetTxTotal 0 -2 CH25444 9 Nov 2011, 1 pm

OTR0080C AMRTargetTxNonHSPA -3 -1 CH25488 10 Nov 2011, 4 pm

OTR0080C AMRTargetTxTotal -2 0 CH25488 11 Nov 2011, 4 pm

OTR0695B AMRTargetTxNonHSPA -3 -1 CH25488 12 Nov 2011, 4 pm

OTR0695B AMRTargetTxTotal -2 0 CH25488 13 Nov 2011, 4 pm

Conclusion:

The feature is working as expected. Good NB-AMR lower codec penetration in RNC TOR1 especially in the

highly congested cells. The Lower NB-Amr codec penetration in NSN RNCs are (on hourly

resolution):30% in TOR1 RNC6% in OTT RNC4% in TOR2 RNC.

NB-AMR parameters tuning on cell level are still ongoing to offload highly congested cells because of AC failures due to lack of DL power.

AnnexNB-AMR Counters

PI ID Name AbbreviationM1000C288 AMR TXPOWER LOAD UNDERLOAD AMR_TXPOW_LOAD_UNDERLOAD

M1000C289 AMR TXPOWER LOAD BELOW TARGET AMR_TXPOW_LOAD_BELOW_TARGET

M1000C290 AMR TXPOWER LOAD OVER TARGET AMR_TXPOW_LOAD_OVER_TARGETM1000C291 AMR TXPOWER LOAD OVERLOAD AMR_TXPOW_LOAD_OVERLOADM1000C292 AMR SPREADING CODE UNDERLOAD AMR_CODE_LOAD_UNDERLOAD

M1000C293 AMR SPREADING CODE LOAD BELOW TARGET AMR_CODE_LOAD_BELOW_TARGET

M1000C294 AMR SPREADING CODE LOAD OVER TARGET AMR_CODE_LOAD_OVER_TARGET

M1000C295 AMR SPREADING CODE LOAD OVERLOAD AMR_CODE_LOAD_OVERLOAD

M1000C296 AMR TRANSMISSION LOAD UNDERLOAD AMR_TRANSM_LOAD_UNDERLOAD

M1000C297 AMR TRANSMISSION LOAD BELOW TARGET AMR_TRANSM_LOAD_BELOW_TARGET

M1000C298 AMR TRANSMISSION LOAD OVER TARGET AMR_TRANSM_LOAD_OVER_TARGET

M1000C299 AMR TRANSMISSION LOAD OVERLOAD AMR_TRANSM_LOAD_OVERLOAD

M1002C561 AMR LOWER CODEC SF128 SELECTED FOR INCOMING CALL AMR_LOWER_CODEC_SF128_INC

M1002C562 AMR LOWER CODEC SF256 SELECTED FOR INCOMING CALL AMR_LOWER_CODEC_SF256_INC

M1002C563 LOAD BASED AMR CODEC DOWNGRADE SF128 SUCCESSFUL LOAD_AMR_DGR_SF128_SUCCESS

M1002C564 LOAD BASED AMR CODEC DOWNGRADE SF256 SUCCESSFUL LOAD_AMR_DGR_SF256_SUCCESS

M1002C565 LOAD BASED AMR CODEC UPGRADE SUCCESSFUL LOAD_AMR_UPGRADE_SUCCESS

M1002C566 AMR CODEC CHANGE FAIL DUE TO ICSU LOAD AMR_CODEC_CHANGE_FAIL_ICSU

M1002C567 AMR CODEC CHANGE FAIL DUE TO OTHER REASONS AMR_CODEC_CHANGE_FAIL_OTHER

NB-AMR Counters (1/2)

NB-AMR Counters (2/2)

ALLO_FOR_AMR_12_2_DL_IN_SRNC DUR_FOR_AMR_12_2_DL_IN_SRNCALLO_FOR_AMR_12_2_UL_IN_SRNC DUR_FOR_AMR_12_2_UL_IN_SRNCALLO_FOR_AMR_10_2_DL_IN_SRNC DUR_FOR_AMR_10_2_DL_IN_SRNCALLO_FOR_AMR_10_2_UL_IN_SRNC DUR_FOR_AMR_10_2_UL_IN_SRNCALLO_FOR_AMR_4_75_DL_IN_SRNC DUR_FOR_AMR_4_75_DL_IN_SRNCALLO_FOR_AMR_4_75_UL_IN_SRNC DUR_FOR_AMR_4_75_UL_IN_SRNCALLO_FOR_AMR_5_15_DL_IN_SRNC DUR_FOR_AMR_5_15_DL_IN_SRNCALLO_FOR_AMR_5_15_UL_IN_SRNC DUR_FOR_AMR_5_15_UL_IN_SRNCALLO_FOR_AMR_5_9_DL_IN_SRNC DUR_FOR_AMR_5_9_DL_IN_SRNCALLO_FOR_AMR_5_9_UL_IN_SRNC DUR_FOR_AMR_5_9_UL_IN_SRNCALLO_FOR_AMR_6_7_DL_IN_SRNC DUR_FOR_AMR_6_7_DL_IN_SRNCALLO_FOR_AMR_6_7_UL_IN_SRNC DUR_FOR_AMR_6_7_UL_IN_SRNCALLO_FOR_AMR_7_4_DL_IN_SRNC DUR_FOR_AMR_7_4_DL_IN_SRNCALLO_FOR_AMR_7_4_UL_IN_SRNC DUR_FOR_AMR_7_4_UL_IN_SRNCALLO_FOR_AMR_7_95_DL_IN_SRNC DUR_FOR_AMR_7_95_DL_IN_SRNCALLO_FOR_AMR_7_95_UL_IN_SRNC DUR_FOR_AMR_7_95_UL_IN_SRNC