Message Boosting Level of BR ChannelSlides in support of the Proposed Text for Message Boosting Level of BR Channel in IEEE 802.16mIEEE 802.16 Presentation Submission Template (Rev. 9)

Document Number:IEEE S80216m-10/0811

Date Submitted:2010-07-13

Source:Jeongho Park, Min-Ho Jang, Hwasun Yoo, Heewon Kang Voice: +82-31-279-7528Samsung Electronics Co., Ltd. E-mail: jeongho.jh.park@samsung.com

Venue:

Re: Proposed text changes to P802.16m/D6

Base Contribution: IEEE C80216m-10/0811

Purpose:Supporting slides for IEEE C80216m-10/0811

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Goal of Proposal Problem Definition

•D6 defines power control for BW REQ CH•Both MSG & Preamble parts of BW REQ refer to the same

“target SINR” BS broadcasts•In the case with same target SINR, performance of MSG &

Preamble are unbalanced (based on simulation results, page 3)

Goal•To find proper tone power boosting level for MSG part over

Preamble•To obtain “Balanced performance” satisfying requirements

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Target Requirements

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Preamble MP < 1% Message MP ~1% Preamble FA < 0.1% Message FA < 0.1% Message PER < 0.1%

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Message Boosting Level, Ped-B 3km/h, 2Rx

3dB or 4dB looks goodBut, 3dB case has 0.5dB link gain

Conclusion

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From the simulation results, we can conclude that

Power boosting 3dB of MSG part over Preamble is recommended •in terms of balanced performance btw Preamble and MSG•Boosting 3dB has 0.5dB link gain over 4dB case•Since MSG part is not mandatory, 2% MP would be okay

Annex : Simulation Environments

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Parameter SettingBW-REQCH P802.16m / Draft 4

Channel Bandwidth 10 MHzFFT Size 1024

Antenna Configuration 1 Tx / 2 RxChannel Model Ped-B 3km/h

Payload Information 13 bits (information) + 5bits (CRC)Structure 6x6 BR Tile Structure

Number of User 1Channel Coding TBCC (Message)

Modulation QPSK (Message)TBCC Encoding Output 72Message Boosting Level Variable

Annex : Preamble, 1MS, Ped-B 3km/h, 2Rx

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Annex : Message, 1MS, Ped-B 3km/h, 2Rx

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Annex : Message Boosting Level, Ped-B 3km/h, 2Rx

March~Jun, Discussion Summary Agreement

•MSG boosting would not be effective if loading is over 1

Disagreement•For 2Rx Ant., Optimal loading would be 1.5

• Because this point cannot satisfy BWREQ requirement•Optimal loading point should be 0.4 (or <1.0)

So, this contribution insists that MSG boosting be still effective at optimal loading point

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Traffic Arrival

Some Arguments 1 MS Case

•Trade off between latency and Tx Power in Region A•Step3 coverage shrink in Region B

When Rx Ant is 2, It would not be effective•Optimal Loading Point is 1.5 BWREQ/frame for RxAnt=2•In this case, Boosting MSG is not effective

• Agree that proposal would be ineffective in case of >1 (See Annex II)

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Response to Arguments (I) Loading Point should be 0.4, not 1.5 for 2Rx Ant.

•MU-MIMO RX cannot decode the message with 19% probability• Pr(x>2)=19% (See Annex I)• Expected requirement is Pr(x>#RxAnt) < 1%• BS shall set BW REQ opportunity which can satisfy this criteria• Considering error prob., Loading should be 0.4 BWREQ/frame for 2

Rx ant.

•A higher load will result in HIGHER Preamble Collision Prob. PC • Expected requirement is PC < 1%• 3 step BR only

• 1.5 BWREQ/frame : PC = 4.4% while 0.7 BWREQ/frame : PC = 1.0%• See Annex III

• 3 step & 5 step BR (uniformly)• 0.75 BWREQ/frame : PC = 4.4% while 0.35 BWREQ/frame : PC = 1.0%

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Response to Arguments (II) Real Optimal Loading Point should be 0.4

(~1)•Point 0.4 can satisfy BWREQ Requirement

• Pr(x>#RxAnt) < 1%• Preamble Collision prob. PC < 1%

•Since loading is under 1, MSG boosting would be effective In Region B, MS still can try Step 3 with

insufficient power•This would decrease delay from 10ms to <10ms for sure

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Annex I : Pr (X > RxAnt) - dot lines

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

0 1 2 3 4 5 6

Solid

: Pr

(X>=

0 &

& X

<=rx

Ant

) D

ot :

Pr(

X>rx

Ant

)

#BWREQ/frame

Optimized Load for BWREQ channel

#rxAnt=2 #rxAnt=3 #rxAnt=4 #rxAnt=2 #rxAnt=3 #rxAnt=4

1.5

19%

0.41%

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Annex II: 2 USERs, Ped-B 3km/h, 2Rx

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Annex III: Collision Prob. (#RxAnt=2)