Constellation Rearrangement version indication method IEEE 802 16

Constellation Rearrangement version indication method IEEE 802. 16 Presentation Submission Template (Rev. 9) Document Number: IEEE C 802. 16 m-09/0343 Date Submitted: 2009 -01 -07 Source: Hyungho Park, Sukwoo Lee LG Electronics, Inc. LG R&D Complex, 533 Hogye-1 dong, Dongan-gu, Anyang, 431 -749, Korea *<http: //standards. ieee. org/faqs/affiliation. FAQ. html> Voice: +82 -31 -450 -1934 E-mail: hyunghopark@lge. com, sugoo@lge. com Re : C 80216 m-08/053 r 1 “Call for Comments and Contributions on Project 802. 16 m Amendment Working Document” for the topic of HARQ Purpose: To provide details on constellation rearrangement version indication method proposed in amendment text of HARQ PHY 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 >.

Introduction • Constellation Rearrangement (Co. Re) is considered as baseline HARQ scheme in the current IEEE 802. 16 m SDD text – – • Co. Re is cost-effective solution to enhance HARQ performance with low complexity Co. Re is applied to both Chase HARQ and IR HARQ with 16 QAM and 64 QAM as modulation mapping Key issue points – Co. Re version signaling overhead • Bit or symbol / subpacket level – Incorporation of DL/UL HARQ operation • • Control signaling: Asynchronous DL HARQ No control signaling: Synchronous UL HARQ – USCCH misdetection impact • In case of USCCH message misdetection, the information on which Co. Re version is applied to received subpacket is also lost. With consideration of USCCH missing, Co. Re version indication method should be considered.

Co. Re version indication • Co. Re version indication with consideration of DL/UL HARQ operation – – – • Co. Re version indication method should be considered to apply Co. Re version to the corresponding subpacket at every transmission. In asynchronous DL HARQ, control signaling fields such as SPID, ACID, and AISN are transmitted for each subpacket by a user specific control channel. Additional control signaling for Co. Re version is needed to avoid USCCH misdetection problem. In synchronous UL HARQ, no control signaling is needed, and HARQ timing relationship including ACK/NACK delay and retransmission time should be implicitly known at MS and BS. Therefore, the transmission order of subpacket is also predetermined with consideration of Co. Re version indication overhead – – – It is recommended that the signaling overhead should be minimized though Co. Re shows better performance if Co. Re version is applied in a symbol level. In case of DL HARQ, it is effective that one Co. Re version is signaled for each subpacket. In case of UL HARQ, it is possible for multiple Co. Re versions to be applied to each subpaket in a symbol level without additional signaling overhead

Co. Re version indication in DL HARQ • Proposed Co. Re version indication – – By considering signaling overhead, Co. Re version is signaled for each subpacket to MS as a starting value for Co. Re version. In case the transmitted bits wraparound at the end of circular buffer, Co. Re version is changed to the next version of current Co. Re version

Co. Re version indication in UL HARQ • Proposed Co. Re version indication – – In synchronous UL HARQ, MS and BS can know which Co. Re versions are applied to each subpacket. Without any additional signaling for Co. Re version, BS is able to decode the subpacket symbols rearranged by Co. Re because of implicit Co. Re version mapping. Therefore, the corresponding Co. Re version can be applied to each symbol within subpacket.