HARQ Buffer Management for Aggressive HARQ transmission IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE S802.16m-09/0891r1.

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Tri-State HARQ Feedback for Aggressive HARQ Transmission

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HARQ Buffer Management for Aggressive HARQ transmission IEEE Presentation Submission Template (Rev. 9) Document Number: IEEE S802.16m-09/0891r1 Date Submitted: Source: Zheng Yan-Xiu, Yu-Chuan Fang, Chang-Lan Tsai, Chung-Lien Ho, Hsi-Min Hsiao ITRI Venue: Re: IEEE m-09/0020, Call for contributions on 16m AWD content. Amendment Working Document (IEEE m-09/0010r1a). Chapter DL control information elements Base Contribution: Purpose: To be discussed and approval by IEEE m TG Notice: This document does not represent the agreed views of the IEEE Working Group or any of its subgroups. It represents only the views of the participants listed in the “Source(s)” field above. It is offered as a basis for discussion. It is not binding on the contributor(s), who reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE Patent Policy: The contributor is familiar with the IEEE-SA Patent Policy and Procedures: and. Further information is located at and.

Motivation Buffer management is necessary to accommodate packet dropped on receiver side –Aggressive HARQ transmission releases buffer constraint from receiver side –HARQ entity can boost transmission rate beyond HARQ buffer capability –Receiver may not store the HARQ burst when buffer is full –Packet is dropped due to buffer outage –It further introduces HARQ failure and makes HARQ performance unpredicatible This contribution introduces tri-state HARQ feedback to maintain the reliable HARQ performance

Proposed Mechanism Tri-state HARQ mechanism –If decoded data is correct, MS feedbacks ACK –If decoded data is incorrect and the redundancy version can be stored in the HARQ buffer, MS feedbacks NACK –If decoded data is incorrect and redundancy version can not be stored in the HARQ buffer, MS feedbacks DROP –BS will retransmit the dropped packet when DROP is received, otherwise, BS will follow existing HARQ mechanism

Simulation Environments Three mechanisms are compared –Tri-State HARQ feedback –Two-State HARQ feedback with buffer constraint –Two-State HARQ feedback without buffer constraint Simulation Environments –HARQ burst = 600 bytes –Maximum 8 HARQ processes –Maximum 4 successful transmissions –HARQ buffer ranges from 10K~80K soft bits –Round trip delay=20ms –Peak rate= 1.92Mbps –No feedback error –PB 3km/hr, VA 30km/hr and 120km/hr –Aggregation buffer is applied

IR-HARQ with PB 3km/hr No CQI Report Error Transmission rate increases by 2~8 times for tri-state HARQ mechanism and two-state HARQ mechanism without buffer constraint Tri-state HARQ mechanism further provides throughput gain when buffer is insufficient Two-state HARQ mechanism introduces large HARQ failure rate when Buffer is insufficient

IR-HARQ with VA 30km/hr No CQI Report Error Transmission rate increases by 2~8 times for tri-state HARQ mechanism and Tri-state HARQ mechanism further provides throughput gain 30~80% throughput gain when HARQ buffer is below 20K soft bits Two-state HARQ mechanism introduces large HARQ failure rate when HARQ buffer is below than 60K soft bits

IR-HARQ with VA 120km/hr No CQI Report Error Transmission rate increases by 2~8 times for tri-state HARQ mechanism and Tri-state HARQ mechanism further provides throughput gain 30~80% throughput gain when HARQ buffer is below 20K soft bits Two-state HARQ mechanism introduces large HARQ failure rate when HARQ buffer is below than 60K soft bits

Conclusions Tri-State HARQ mechanism guarantees HARQ reliability even there is package drop due to buffer overflow Tri-State HARQ mechanism can boosts throughput by 5~8 times Tri-State HARQ mechanism is recommended to adopted to 16m to increase transmission rate with buffer constraint Recommend to adopt the proposed text #1 in C802.16m-09/0894r1 Recommend to adopt the proposed text #2 in C802.16m-09/0894r1 Recommend to adopt the proposed text #3 in C802.16m-09/0894r1 Recommend to adopt the proposed text #4 in C802.16m-09/0894r1 Recommend to adopt the proposed text #5 in C802.16m-09/0894r1

APPENDIX

AGGRESSIVE IR-HARQ TRANSMISSION WITH 3DB CQI REPORT ERROR

IR-HARQ with PB 3km/hr 3dB CQI Report Error Transmission rate increases by 2~8 times for tri-state HARQ mechanism and two-state HARQ mechanism without buffer constraint At high SNR, aggressive HARQ mechanism provides more transmission rate Tri-state HARQ mechanism further provides throughput gain when buffer is insufficient Two-state HARQ mechanism introduces large HARQ failure rate when Buffer is insufficient

IR-HARQ with VA 30km/hr 3dB CQI Report Error Transmission rate increases by 2~8 times for tri-state HARQ mechanism Aggressive HARQ mechanism increases more throughput when SNR is high Two-state HARQ mechanism introduces large HARQ failure rate when HARQ buffer is below than 60K soft bits or SNR is below than 16dB Two-state HARQ mechanism introduces less transmission rate due to high HARQ failure rate

IR-HARQ with VA 120km/hr 3dB CQI Report Error Transmission rate increases by 2~8 times for tri-state HARQ mechanism Aggressive HARQ mechanism increases more throughput when SNR is high Two-state HARQ mechanism introduces large HARQ failure rate when HARQ buffer is below than 60K soft bits or SNR is below than 16dB Two-state HARQ mechanism introduces less transmission rate due to high HARQ failure rate

AGGRESSIVE CC-HARQ TRANSMISSION WITH NO CQI REPORT ERROR

CC-HARQ with PB 3km/hr No CQI Report Error Transmission rate increases by 2~8 times for tri-state HARQ mechanism Two-state HARQ mechanism introduces large HARQ failure rate when HARQ buffer is below than 60K soft bits Link reliability significantly decreases due to highly correlated channel condition

CC-HARQ with VA 30km/hr No CQI Report Error Transmission rate increases by 2~8 times for tri-state HARQ mechanism Two-state HARQ mechanism introduces large HARQ failure rate when HARQ buffer is below than 60K soft bits Tri-State HARQ mechanism provides better link quality

CC-HARQ with VA 120km/hr No CQI Report Error Transmission rate increases by 2~8 times for tri-state HARQ mechanism Two-state HARQ mechanism introduces large HARQ failure rate when HARQ buffer is below than 60K soft bits Tri-State HARQ mechanism provides better link quality

AGGRESSIVE IR-HARQ TRANSMISSION WITH 3DB CQI REPORT ERROR

CC-HARQ with PB 3km/hr 3dB CQI Report Error Transmission rate increases by 2~8 times for tri-state HARQ mechanism Two-state HARQ mechanism introduces large HARQ failure rate when HARQ buffer is below than 60K soft bits Link reliability significantly decreases due to highly correlated channel condition

CC-HARQ with VA 30km/hr 3dB CQI Report Error Transmission rate increases by 2~8 times for tri-state HARQ mechanism Two-state HARQ mechanism introduces large HARQ failure rate when HARQ buffer is below than 60K soft bits Tri-State HARQ mechanism provides better link quality

CC-HARQ with VA 120km/hr 3dB CQI Report Error Transmission rate increases by 2~8 times for tri-state HARQ mechanism Two-state HARQ mechanism introduces large HARQ failure rate when HARQ buffer is below than 60K soft bits Tri-State HARQ mechanism provides better link quality