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Reduction of power consumption of AT with discontinuous report of DRC

Kenichi MiyoshiPanasonicTEL +81 468 40 5161 FAX +81 468 40 5183 E-mail Kenichi.Miyoshi@yrp.mci.mei.co.jp

July 24, 2000

This contribution presents the simulation results of the discontinuous DRC report scheme proposed by Panasonic at TSG-C WG3 in Hawaii.

Discuss and Adopt.

PanasonicC30-20000724-XXX TSG-C 1XEV Physical Layer AdHoc Conference Call Jul./24/2000-2

Contents

Explanation of proposed scheme

Explanation of how to distinguish DRC erasure from DRC non-report

Simulation results of – DRC error rate and erasure rate– DRC change ratio under fast fading environment

PanasonicC30-20000724-XXX TSG-C 1XEV Physical Layer AdHoc Conference Call Jul./24/2000-3

Proposed discontinuous report of DRC

Discontinuous report of DRC – AT reports DRC when DRC changes– When the suspension of DRC continues for several

slots(e.x. 4), AT reports DRC even if DRC doesn’t change <Fault Tolerant Mechanism>

AT can reduce the power consumption

The reverse link capacity can be increased

DRCTransmission

2 2 43 52 3

4 4

PanasonicC30-20000724-XXX TSG-C 1XEV Physical Layer AdHoc Conference Call Jul./24/2000-4

How to distinguish erasure from non-report

Start

Ppl>Therasure ? N

Y

Ppl-PDRC>Thnon-report ? N

Y

DRC erasureDRC reportedDRC not reported

Ppl: power of Pilot symbolPDRC:power of DRC symbolTherasure:Threshold level for DRC ErasureThnon-report:Threshold level for DRC non-report

PanasonicC30-20000724-XXX TSG-C 1XEV Physical Layer AdHoc Conference Call Jul./24/2000-5

Simulation parameters

Channel model 1p-Rayleigh 3km/h

Number of AP 1

DRC_Length 1

RL power control 1% Packet Error Rate

0dB to –15dB

10dBThnon-report

DRC non-report threshold

AP RX Dual antennas

Parameter Value

Therasure

DRC erasure threshold

PanasonicC30-20000724-XXX TSG-C 1XEV Physical Layer AdHoc Conference Call Jul./24/2000-6

DRC error rate and erasure rate(1)

Qualcomm’s simulation result seems strange.When erasure rate is almost 50%, threshold level is about –16dB.(C30-20000710-011 QCOM DRC Channel Simulations)

DRC Channel Performance 1-p Rayl 3km/h No Handoff

0.0001

0.001

0.01

0.1

1

-15 -14 -13 -12 -11 -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0

DRC Erasure Threshold(dB)

DR

C E

rasu

re/E

rro

r R

ate QCOM Erasure Rate

QCOM Error Rate

Panasonic Erasure Rate

Panasonic Error Rate

PanasonicC30-20000724-XXX TSG-C 1XEV Physical Layer AdHoc Conference Call Jul./24/2000-7

DRC error rate and erasure rate(2)

DRC erasure threshold should be chosen to keep reliable DRC error rate

DRC non-report threshold should be chosen to control DRC error

AP can guarantee reliable operation of the system

PanasonicC30-20000724-XXX TSG-C 1XEV Physical Layer AdHoc Conference Call Jul./24/2000-8

Simulation parameters1(DRC change ratio)

Channel model1)2p-Rayleigh 3km/h2)2p-Rayleigh 30km/h3)2p-Rayleigh 120km/h

Number of AT 1

AT RX 1 antenna

Parameter Value

PanasonicC30-20000724-XXX TSG-C 1XEV Physical Layer AdHoc Conference Call Jul./24/2000-9

Simulation parameters2(DRC change ratio)

Data Rate [kbps] Ec/Nt [dB]

1 76.8 -10.2

2 153.6 -7.3

3 307.2 -4.3

4 307.2 -4.2

5 614.4 -1.1

6 614.4 -1.0

7 921.6 1.6

8 1228.8 3.4

9 1228.8 3.5

10 1843.2 7.1

11 2457.6 9.2

PanasonicC30-20000724-XXX TSG-C 1XEV Physical Layer AdHoc Conference Call Jul./24/2000-10

DRC change ratio

DRC Change ratio

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1 4 7 10 13 16 19

Number of Continuous DRC

Pro

ba

bili

ty

V=3km/h

V=30km/h

V=120km/h

2pathRayleigh Fading

PanasonicC30-20000724-XXX TSG-C 1XEV Physical Layer AdHoc Conference Call Jul./24/2000-11

Power consumption reduction of AT

DRC change ratio and reduction of power consumption

Proposed scheme is powerful even under the frequent DRC change environment

3km/h 2Path Rayleigh 30.9%

30km/h 2Path Rayleigh 66.4%

77.1%120km/h 2Path Rayleigh

33.7%16.4%11.2%

Channel DRC changeRatio [*1]

Reduction ofAT’s Power consumption[*2]

*1 With Fault Tolerant Mechanism*2 Calculated by the equation (C30-20000710-024 p.12)

PanasonicC30-20000724-XXX TSG-C 1XEV Physical Layer AdHoc Conference Call Jul./24/2000-12

Summary

Proposed AT’s discontinuous DRC report – can reduce AT’s power consumption– can guarantee DRC reliability with

introduction of DRC erasure mechanism– Powerful even under frequent DRC change

environment