Basic and Enhanced 2 bit HARQ Feedback IEEE

Basic and Enhanced 2 -bit HARQ Feedback IEEE 802. 16 Presentation Submission Template (Rev. 9) Document Number: IEEE C 802. 16 m-09/0501 Date Submitted: 2009 -3 -3 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 Venue: IEEE Session #60, Vancouver Base Contribution: C 802. 16 m-09/0501 IEEE 802. 16 m-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. 16 m 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. 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 802. 16. Patent Policy: The contributor is familiar with the IEEE-SA Patent Policy and Procedures: <http: //standards. ieee. org/guides/bylaws/sect 6 -7. html#6> and <http: //standards. ieee. org/guides/opman/sect 6. html#6. 3>. Further information is located at <http: //standards. ieee. org/board/pat-material. html> and <http: //standards. ieee. org/board/pat >.

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

Basic and enhanced 2 -bit HARQ feedback • Basic 2 -bit HARQ feedback supports identical feedback capacity with better link quality • Enhanced 2 -bit HARQ feedback supports double feedback capacity with performance degradation Sequence index 0 1 2 3 1 -bit Feedabck Basic 2 -bit Feedback (even/odd channel) Even numbered channel ACK Even numbered channel NACK Odd numbered channel NACK ACK/NACK/NACK Orthogonal sequence [+1 +1] [+1 -1] [+1 +1 -1 -1] [+1 -1 -1 +1] Sequence index Sequences Enhanced 2 -bit Feedback (even/odd channel) 0 1 2 3 4 5 6 7 [+2 0] [0 +2] [+1+j +1 -j] [+1 -j +1+j] [+2 0 -2 0] [0 +2 0 -2] [+1+j +1 -j -1+j] [+1 -j +1+j -1 -j] ACK/ACK ACK/NACK/ACK NACK/NACK

Simulation Environment • HTM is referred to IEEE C 802. 16 m-09 -386 • Simulation parameters are referred to EVM Channel Bandwidth 10 MHz Over-sampling Factor 28/25 FFT Size 1024 Cyclic prefix (CP) ratio 1/8 Channel condition PB 3, VA 120, VA 350 The number of antennas Tx: 1, Rx: 2 Modulation BPSK/QPSK FMT size 2 x 6 Receiver HARQ FB: non-coherent detection, MLD

Performance Comparison • Basic 2 -bit HARQ feedback provides at least 3 d. B performance gain • Enhanced 2 -bit HARQ feedback renders 5 d. B performance loss • LGe’s 2 -bit HARQ feedback renders 8 d. B performance loss

Examples of Concurrent HARQ Feedback Multi-Carrier TDD Mode Multiple Streams MIMO

Conclusion • Adopt basic 2 -bit HARQ feedback as mandatory HARQ feedback • Adopt enhanced 2 -bit HARQ feedback as optional HARQ feedback