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Reference Signal Power Boost Trial

Reference Signal Power Boost Trial. Reference Signal Power Boost. The Reference Signal (RS) allows the UE to make an estimate of channel conditions over the entire cell bandwidth.

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Reference Signal Power Boost Trial

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  1. Reference Signal Power Boost Trial

  2. Reference Signal Power Boost • The Reference Signal (RS) allows the UE to make an estimate of channel conditions over the entire cell bandwidth. • The UE evaluates in the downlink the quality of the radio link of the serving cell. The UE bases its evaluation on the cell-specific reference signal relative to thresholds Qout and Qin. • Qout is defined as the level at which the downlink radio link cannot be reliably received. Qin is defined as the level at which the downlink radio link can be received with significant reliability. • Qout and Qin are defined relative to the block error rate of a hypothetical PDCCH transmission and the thresholds are defined in 3GPP TS 36.133. The quality of the radio link is evaluated in every radio frame if the UE is not in Discontinuous Reception (DRS) mode. • If the radio link quality is below the threshold Qout over the period of 200 ms, timer T310 is started, assuming N310=1. See 3GPP TS 36.133. • At the expiration of the T310 timer, the UE switches off uplink transmission. If the radio link quality is above the threshold Qin over the period of 100 ms, timer T310 is stopped, assuming N311is set to 1. See 3GPP TS 36.133. • If the UE is in DRS mode, the DRS cycle length dependent evaluation period is used instead, see 3GPP TS 36.133. • In L12A ICP5 SPP16 and L12B UM6.1, there is a function to define the RS Power Boost at • 3 dB, • 1.7 dB or • 0 dB (RS Power Boost de-active) • RS Power Boost Parameter Name: deltaPsdRs2Tx • RS power boost (+3dB) is activated by default (current setting in AT&T’s network)

  3. RS Power BoostTRIAL FrameworkPerformance Improvement • Test Environment: • LA Market • Rural (may degrade performance with RS Power Boost de-activated) • One Cluster (~25 eNBs) • Test Cases: Set RS Power Boost at: • 3 dB (current) • 1.7 dB • 0 dB (RS Power Boost de-active) • Evaluate the performance of the key KPIs. • Expected Benefits • 10-15% DL throughput improvement • Trial Market (proposed): LA • Approximately 25 eNBs, L12B

  4. Trial Areas TRIAL AREA LA Market, L12B Sites AREA 1 (see left) eNB SITES (29) CLL03239, CLL03240, CLL03241, CLL03242, CLL03243, CLL03244, CLL03255, CLL03341, CLL03347, CLL03405, CLL03407, CLL03408, CLL03409, CLL03412, CLL03413, CLL03417, CLL03418, CLL03419, CLL03427, CLL03430, CLL03444, CLL03445, CLL03447, CLL03464, CLL03649, CLL03650, CLL03652, CLL03665, CLL03666 AREA 2 AREA 1 The Area 1 is suburban with some office / low industrial buildings. 

  5. TRIAL Schedule Note: The default value for TimeToTriggerA2Prim is 640 ms

  6. Performance Details

  7. CLL03417_7A_1 Experienced Serious Degradation on Nov 23 As degradations happened to CLL03417_7A_1 on Nov 23, it should be taken into consideration in the evaluation of the KPI trend according to RS Boost changes.

  8. 11/6/2012 11/15/2012 12/4/2012 TC4: RS Boost=1.7dBA2TTT=1280ms TC3: RS Boost=0dB TC2: RS Boost=1.7dB TC1: RS Boost=3dB Caused by CLL03417_7A_ Observations: 1. Total setup successful rate had obvious increase since RS Boost change from 3dB to 1.7dB.2. Total setup successful rate shows more improvement after RS Boost change from 1.7dB to 0dB. 3. Total setup successful rate increase is caused by RRC and initial RAB setup rate increase.4. ERAB addition successful rate varies.

  9. 11/6/2012 11/15/2012 12/4/2012 TC4: RS Boost=1.7dBA2TTT=1280ms TC3: RS Boost=0dB TC2: RS Boost=1.7dB TC1: RS Boost=3dB Caused by CLL03417_7A_ Caused by CLL03417_7A_ Observations: Erab Drop rate had obvious improvement after RS Boost change from 3dB to1.7dB. Erab Drop rate shows more improvement since RS Boost change from 1.7dB to 0dB. ERAB Drop rate shows increase after reversion to 1.7dB.

  10. 11/6/2012 11/15/2012 12/4/2012 TC4: RS Boost=1.7dBA2TTT=1280ms TC3: RS Boost=0dB TC2: RS Boost=1.7dB TC1: RS Boost=3dB Caused by CLL03417_7A_ Observations: Overall increase in IntraLTE Handover success rate, while no obvious difference corresponding to RS Boost change from 1.7dB to 3dB.

  11. 11/6/2012 11/15/2012 12/4/2012 TC4: RS Boost=1.7dBA2TTT=1280ms TC3: RS Boost=0dB TC1: RS Boost=3dB TC2: RS Boost=1.7dB Observations: IRAT rate had obvious increase after RS Boost changes. The change in the A2 time to trigger has mitigated this effect (TC4). This was a reduction over the TC2 case with the same RS Power Boost.

  12. 11/6/2012 11/15/2012 12/4/2012 TC4: RS Boost=1.7dBA2TTT=1280ms TC3: RS Boost=0dB TC1: RS Boost=3dB TC2: RS Boost=1.7dB • Observations: • Increase in DL Throughput after RS Boost change from 3dB to 1.7dB; further improvement after RS Boost change from 1.7dB to 0dB. • Reduction in DL/UL throughput for TC4. This is attributable to holding the UE longer in bad RF conditions.

  13. 11/6/2012 11/15/2012 12/4/2012 TC4: RS Boost=1.7dBA2TTT=1280ms TC3: RS Boost=0dB TC1: RS Boost=3dB TC2: RS Boost=1.7dB Observations: DL/UL PDCP trending upward with normal traffic growth.

  14. 11/6/2012 11/15/2012 12/4/2012 TC4: RS Boost=1.7dBA2TTT=1280ms TC3: RS Boost=0dB TC1: RS Boost=3dB TC2: RS Boost=1.7dB • Observations: • Increase in DL HARQ ACK for QPSK and16QAM after RS Boost change from 3dB to 1.7dB. • More improvement in DL HARQ ACK for QPSK and 16QAM after change from 1.7dB to 0dB. • 64QAM ACK has no obvious change. • Reduction back to 1.7dB RS Power Boost levels for TC4.

  15. 11/6/2012 11/15/2012 12/4/2012 TC4: RS Boost=1.7dBA2TTT=1280ms TC3: RS Boost=0dB TC1: RS Boost=3dB TC2: RS Boost=1.7dB • Observations: • Increase in UL HARQ ACK for QPSK and16QAM after RS Boost change from 3dB to 1.7dB. • More improvement in UL HARQ ACK for QPSK and 16QAM after change from 1.7dB to 0dB. • UL HARQ success rate follows the RS Power Boost. Overall degradation due to the A2 time to trigger increase.

  16. 11/6/2012 11/15/2012 12/4/2012 TC4: RS Boost=1.7dBA2TTT=1280ms TC3: RS Boost=0dB TC1: RS Boost=3dB TC2: RS Boost=1.7dB Observations: Trending increase in ERAB events.

  17. 11/6/2012 11/15/2012 12/4/2012 TC4: RS Boost=1.7dBA2TTT=1280ms TC3: RS Boost=0dB TC1: RS Boost=3dB TC2: RS Boost=1.7dB Observations: ERAB and RRC connections vary. Trending upward with normal traffic growth.

  18. Conclusions • Increase Accessibility, Retainability, DL Throughput, DL/UL HARQ ACK Rate of QPSK&16QAM after RS Boost change from 3dB to 1.7dB, and then those indicators were further improved after change from 1.7dB to 0dB: • Increase in Intra Handover Successful Rate the following indicators after RS Boost change from 3dB to 1.7dB, while those indicators shows no more increase after further change from 1.7dB to 0dB • IRAT Rate becomes higher and higher with decrease in RS Boost value. • A2 Time to Trigger lowered the IRAT rate but had an adverse effect on throughput since UEs were held longer in poor RF conditions.

  19. THANK YOU

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