CDMA2000 1x Rev E: Power Control CDMA2000 1x Rev E: Power Control Improvement Improvement

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OutlineOutline

• Power Control Modifications When no traffic in Reverse Link

• RL Smart Blanking is enabled. Disable the transmission of invalid PCBs in FL When no traffic in Forward Link

• RL Smart Blanking is disable. PC slows down after early termination• FL Smart Blanking is enabled. PC slow down in 0bps frames.

• Appendix: Detailed Analysis of Capacity Gains from RPC Overhead Reduction EVRC and EVRC-B Vocoder Rate Statistics FL Frame Early Termination Statistics RPC Overhead Reduction Savings The Voice User Capacity Gains.

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The Power Control Issues in 1x Rev. EThe Power Control Issues in 1x Rev. E

• Issue 1: There are many Power Control Bit redundancy in both FL and RL in the 400Hz mode. PCBs are always transmitted in full power. Redundant PCBs bring down system capacity

• Issue 2: The 200Hz FPC mode hasn’t been comprehensively verified. It is understandable to adopt the 200Hz RPC from our

experience with DO Rev. A/B and the achievable performance of early termination and RL-SIC.

It is not clear how the 200Hz FPC will work providing there is limited signal processing capability at MS.

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Power Control RatesPower Control Rates

• PCB transmission power does not scale down with data rate but increases with number of cells in active set.

• Two PC rates for RC11/RC8 are in the baseline: 200/400Hz. The 200Hz PC rate is doable with frame early termination and SIC on

Reverse Links. [Source: C30-20090205-001]• DO Rev 0: 600Hz RL CLPC, no RL H-ARQ; • DO Rev A: 150Hz RL CLPC, RL H-ARQ; ~3dB capacity gain over DO-Rev0

• The performance of 200Hz FPC has not been comprehensively verified yet.

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Power Control ModificationsPower Control Modifications

• When POWER_CONTROL_MODEs = ‘00’ with PCBs transmitted at 400bps in FL, it is proposed that1) When there is no traffic in RL with RL smart

blanking enabled. [VIA C30-20090216-022] It was proposed that RPC is reduced to 200Hz when the BS

detects R-PICH gating. Only when a blind detection is already at the BSs.

2) When there is no traffic in FL. Whatever RL smart blanking is enabled or disabled. It is

proposed that both RPC and FPC may be reduced to 200Hz in the rest of frame when an early termination happens on the forward link. NO Blind Detection is Necessary.

FL smart blanking is on. PC slow down in 0bps frames. NO Blind Detection is Necessary.

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User Capacity Gains from PC ModificationsUser Capacity Gains from PC Modifications

Cases 1 2 3T_ADD (dB) -14 -16 -14Original capacity 47 65 78Improved Capacity 50 68 82Capacity Gain 6.38% 4.62% 5.13%

EVRC-B and … Full Rate Half Rate 1/4 Rate 1/8 Rate TotalRL Smart-Blanking is Enabled 30% 30% 30% 30% 30%FL Smart-Blanking isDisabled 10.9% 25.6% 32.1% 38.3% 31%FL Smart-Blanking is Enabled 10.9% 25.6% 32.1% 50% 38%

Table 2. VoIP User Capacity Gain from PC Overhead Reduction

Table 1. PC Overhead Reduction Percentages

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ConclusionConclusion

• We recommend the working group to adopt the following two power control modifications When no traffic in Reverse Link

• RL Smart Blanking is enabled. Disable the transmission of invalid PCBs in FL

When no traffic in Forward Link• RL Smart Blanking is disable. PC slows down after early termination• FL Smart Blanking is enabled. PC slow down in 0bps frames.

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ReferencesReferences

1) Qualcomm, 1x-Rev E New RC High Level Description. C30-20080616-013.

2) Qualcomm, 200Hz CL PC mode for 1x-Revision E C30-20090205-001

3) VIA, Reverse Link Power Control Overhead Reduction for cdma2000 1x Rev. E, C30-20090216-022

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Appendix: Capacity Gain from RPC Overhead Appendix: Capacity Gain from RPC Overhead ReductionReduction

1) EVRC and EVRC-B Vocoder Rate Statistics1) EVRC and EVRC-B Vocoder Rate Statistics2) FL Frame Early Termination Statistics2) FL Frame Early Termination Statistics3) RPC Overhead Reduction Savings3) RPC Overhead Reduction Savings4) The Voice User Capacity Gains4) The Voice User Capacity Gains

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Vocoder Rate StatisticsVocoder Rate Statistics

Source: QC C30-20080616-013

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FL Frame Early Termination FL Frame Early Termination StatisticsStatistics

Source: QC C30-20080616-013

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RL PCB OverheadRL PCB Overhead

• For the new RL RC8, the BS transmits power control bits (for reverse link power control) in PCG 1, 3, 5, 7, 9, 11, 13, and 15. When the MS transmits a non-null-rate frame, all power control

bits received by the mobile station are considered valid. When smart blanking is enabled for the reverse link and the mobile

station transmits at 0 bps, only power control bits received by the mobile station in PCG 1, 5, 9, and 13 are considered valid.

• Tx power for PCB does not scale down with data rate but increases with number of cells in active set.

Source: QC C30-20080616-013