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									                                                          Basic and Enhanced 2-bit HARQ Feedback

IEEE 802.16 Presentation Submission Template (Rev. 9)
Document Number:
   IEEE S802.16m-09/0501r2
   Date Submitted:
   2009-3-8
  Source:
         Zheng Yan-Xiu, Yu-Chuan Fang, Chang-Lan Tsai, Chung-Lien Ho, Hsi-Min Hsiao, Ren-Jr Chen
         E-mail: zhengyanxiu@itri.org.tw.
         ITRI
         Pei-Kai Liao, Chih-Yuan Lin, Yu-Hao Chang, Ciou-Ping Wu and Paul Cheng
         MediaTek Inc.

 Venue:
          IEEE Session #60, Vancouver

 Base Contribution: C802.16m-09/0501r2
      IEEE 802.16m-09/0012, “Call for Comments on Amendment Working Document”
      Target topic: “15.3.9.2.2 HARQ Feedback Control Channel”.

Purpose:
   To be discussed and approval by IEEE 802.16m TG
Notice:
   This document does not represent the agreed views of the IEEE 802.16 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.
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   also acknowledges and accepts that this contribution may be made public by IEEE 802.16.
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                   Motivation

• This contribution provide simulation results for
  performance comparison between 1-bit, basic 2-
  bit and enhanced 2-bit HARQ feedback
  performance
                Simulation Environment

•   HMT is referred to IEEE
    C802.16m-09-386
                                Channel Bandwidth    10MHz
•   Simulation parameters are
                                Over-sampling        28/25
    referred to EVM             Factor
                                FFT Size             1024
                                Cyclic prefix (CP)   1/8
                                ratio
                                Channel condition    PB3, VA120, VA350
                                The number of        Tx:1, Rx:2
                                antennas
                                Modulation           BPSK/QPSK
                                FMT size             2x6
                                Receiver             HARQ FB: non-coherent
                                                     detection, MLD
    Basic 1-bit and 2-bit HARQ feedback

•   Basic 1-bit HARQ feedback:
     – Each MS chooses one sequence from even numbered channel or odd
       number numbered channel
     – The MS sends the chosen sequence as the HARQ feedback
     – Three HMTs can carry two sequences to transmit two HARQ feedbacks
•   Basic 2-bit HARQ feedback
     –   Each MS chooses one sequence from four sequences
     –   The MS sends the chosen sequence as the HARQ feedback
     –   Three HMTs carry only one sequence to transmit two HARQ feedbacks
     –   Since two HARQ feedbacks are carried by one sequence, the power of
         two sequences is aggregated to one sequence, i.e. 3dB power gain

    Sequence       Orthogonal                                 Basic 2-bit Feedback
                                       1-bit Feedabck          (even/odd channel)
      index        sequence
        0      [+1 +1 +1 +1]      Even numbered channel ACK        ACK/ACK
        1        [+1 -1 +1 -1]   Even numbered channel NACK       ACK/NACK
        2        [+1 +1 -1 -1]    Odd numbered channel ACK        NACK/ACK
        3        [+1 -1 -1 +1]   Odd numbered channel NACK       NACK/NACK
       Enhanced 2-bit HARQ feedback

•   Enhanced 2-bit HARQ feedback
     – Each MS chooses one sequence from even numbered channel or odd
       number numbered channel
     – The MS sends the chosen sequence as the HARQ feedback
     – Three HMTs carry only two sequence to transmit four HARQ feedbacks
     – Since two HARQ feedbacks are carried by one sequence, the power is
       boosted by extra 3dB due to doubled information


    Sequence                                         Enhanced 2-bit Feedback
                           Sequences                    (even/odd channel)
      index
        0                  [+2 0    +2 0]          Even numbered channel ACK/ACK
        1                 [0 +2     0 +2]         Even numbered channel ACK/NACK
        2             [+1+j +1-j    +1+j +1-j]    Even numbered channel NACK/ACK
        3             [+1-j +1+j    +1-j +1+j]   Even numbered channel NACK/NACK
        4                  [+2 0    -2 0]          Odd numbered channel ACK/ACK
        5                  [0 +2    0 -2]         Odd numbered channel ACK/NACK
        6              [+1+j +1-j   -1-j -1+j]    Odd numbered channel NACK/ACK
        7              [+1-j +1+j   -1+j -1-j]   Odd numbered channel NACK/NACK
               Performance Comparison

•   Basic 2-bit HARQ
    feedback provides at
    least 2.5dB performance
    gain

•   Enhanced 2-bit HARQ
    feedback renders 5dB
    performance loss

•   LGe’s 2-bit HARQ
    feedback renders 8dB
    performance loss
                  Conclusion

• Adopt basic 2-bit HARQ feedback as mandatory HARQ
  feedback due to 2.5dB performance gain.
• Object enhanced 2-bit HARQ feedback as optional
  HARQ feedback due to at least 5dB performance loss.
• Detail text proposal is in C80216m-09_0501r2
Examples of Concurrent HARQ Feedback



                      Multi-Carrier




                      TDD Mode




                      Multiple Streams MIMO

								
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