1. SPID transmission order in IEEE 802.16m UL HARQ
IEEE Presentation Submission Template (Rev. 9)
Document Number:
IEEE C802.16m-09/0341
Date Submitted:
Source:
Hyungho Park, Sukwoo Lee Voice:
LG Electronics, Inc.
LG R&D Complex, 533 Hogye-1dong,
Dongan-gu, Anyang, , Korea
*<
Re : C80216m-08/053r1 “Call for Comments and Contributions on Project m Amendment Working Document” for the topic of HARQ
Purpose: To provide details on SPID transmission order for uplink HARQ operation proposed in amendment text of HARQ PHY
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 < >. 1

2. Introduction IEEE 802.16m HARQ operation
IEEE m HARQ operation is asynchronous HARQ for downlink and synchronous HARQ for uplink, respectively.
For DL HARQ retransmission, there are a SPID field and HARQ channel ID (ACID) in user specific control channel, where SPID indicates the subpacket for HARQ retransmission.
UL HARQ operation has no control signaling applicable for HARQ functionality, HARQ timing relationship including ACK/NACK delay and retransmission time should be implicitly known at MS and BS.
SPID transmission order for UL HARQ
No control signaling for subpacket transmission.
By implicit mapping of HARQ retransmission time to subframe index, subpacket transmission order for HARQ retransmission is required.
SPID transmission order should be selected to obtain full IR gain
IR HARQ performance depends on the transmission order of subpackets.
The effect of selecting subpacket transmission order is more clearly shown in high code rate case.

3. SPID transmission order
Proposed transmission order
The total number of transmission is assumed as four including initial transmission.
In order to clearly show the effect of SPID selection for each retransmission, QPSK/16QAM/ 64QAM and high coding rate (3/4) under fading channel environment is considered as simulation parameters.
From the simulation results, the following SPID transmission order is recommended for UL HARQ
SPID index for ith transmission
SPID index for i+1th transmission
SPID 0
SPID 1
SPID 2
SPID 3
Subpacket transmission order in UL HARQ

4. Performance Result Simulation Parameters Parameters Assumption
Bandwidth
10 MHz
Number of subcarrier
1024
Frame length
5ms
Channel estimation
Perfect
Channel code
CTC 3/4, 4/5
Modulation
QPSK, 16 QAM, 64 QAM
MIMO configuration
Tx: 2, Rx: 2
Resource allocation
PUSC
Channel model
PED B
MS mobility
30km/h
Receiver type
Linear MMSE
Maximum number of retransmission 1
Retransmission latency
10ms

5. Performance Result [1]
PED B 30km/h, Nep:2880, CTC 3/4

6. Performance Result [2]
PED B 30km/h, Nep: 2880, , CTC 3/4

7. Performance Result [3]
PED B 30km/h, Nep: 2880, CTC 4/5

8. Performance Result [4]
PED B 30km/h, Nep:288, CTC 3/4

9. Performance Result [5]
PED B 30km/h, Nep:288, CTC 3/4

10. Performance Result [6]
PED B 30km/h, Nep:388, CTC 3/4