Proposal of MAC PDU Reordering Function IEEE 802

Proposal of MAC PDU Reordering Function IEEE 802. 16 Presentation Submission Template (Rev. 9) Document Number: IEEE C 80216 m-08 -1122 r 1 Date Submitted: 2008 -09 -18 Source: Nak Woon Sung, Sook-jin Lee, Juhee Kim, Eunkyung Kim, Sungcheol Chang, Kyung Soo Kim ETRI E-mail : {nwsung, sjlee, jhhee, ekkim, scchang, kksu}@etri. re. kr Venue Re : MAC Data Plane ; in response to the TGm Call for Contributions and Comments 802. 16 m-08/033 for Session 57 Base Contribution: N/A Purpose: To be discussed and adopted by TGm 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 • Legacy IEEE 802. 16 e system[1] – To deal with ordering implication of HARQ, each connection may enable ARQ or PDU SN mechanism on top of the enabled HARQ connection. • Based on the recent version of SDD(80216 m-08 -003 r 4)[2] – HARQ is supported in downlink and uplink packet (re)transmissions in both BS and MS to improve robustness and performance. – The HARQ operation relies on N-process (multi-channel) stop-and-wait protocol. (10. 2) – A common MAC Entity may control a PHY spanning over multiple frequency channels. – The MAC entity may support simultaneous presence of MSs with different capabilities, such as operation over one channel at a time only or aggregation across contiguous or non-contiguous channels. (8. 1. 3) 2

Motivation • Although legacy IEEE 802. 16 e supports PDU reordering, – Only support single carrier For the multi-carrier operation, the PDU reordering function should be supported. 3

PDU reordering in single carrier • PDU in-sequence delivery in MAC layer may not be assured due to HARQ N-process stop-and-wait protocol. <Figure 1> PDU reordering in single carrier 4

PDU disarrangement in multi-carrier • PDU in-sequence delivery in MAC layer may not be assured due to parallel processing of physical layer bursts including multiple PDUs <Figure 2> PDU Disarrangement according to parallel processing 5

PDU disarrangement in multi-carrier (cont’d) • PDU in-sequence delivery in MAC layer may not be assured due to resource allocation mechanism. <Figure 3> PDU Disarrangement according to resource allocation 6

Conclusion • To resolve above problem, we suggest to define the MAC PDU reordering function for PDU in-sequence delivery in IEEE 802. 16 m system. • The MAC PDU reordering function is needed only except for the Single-Carrier and Non-HARQ case in the IEEE 802. 16 m system. Table 1 The MAC PDU Reordering according to operation modes Carrier Mode HARQ Mode MAC PDU Reordering Single Carrier Non-HARQ X HARQ O Non-HARQ O Multi-Carrier Note) - X : It does not need PDU Reordering Function in MAC. - O : It needs PDU Reordering Function in MAC. 7

Text Proposal to IEEE 802. 16 m SDD Insert the following text into MAC Layer clause (Chapter 8 in [IEEE 802. 16 m-08/003 r 4]) ---------------- Text Start ---------------8. 1. X MAC PDU Reordering Function The MAC PDU reordering function enables received PDUs to be arranged in order using PDU SN mechanism for HARQ in single-carrier operation. However, in multi-carrier operation, it is supported for non-HARQ as well as HARQ. ---------------- Text End ----------------Insert the following text into support for Multi-carrier clause (Chapter 19 in [IEEE 802. 16 m-08/003 r 4]) ---------------- Text Start ---------------19 Support for Multi-Carrier 19. X MAC PDU Processing Construction and transmission of MAC PDU in OFDMA multi-carrier operation mode is supported with the same operation as that in single carrier operation mode. However, in multi-carrier operation, the MAC PDU reordering should be supported to maintain in-sequence delivery of PDUs. ---------------- Text End ----------------8

Reference [1] IEEE 802. 16 Rev 2/D 6, “Air Interface for Broadband Wireless System”, 2008 -06. [2] IEEE 802. 16 m-08/003 r 4, “Draft IEEE 802. 16 m System Description Document”, 2008 -07 -29. 9