Uplink Control PHY Design for HARQ Tri-State Feedback
IEEE 802.16 Presentation Submission Template (Rev. 9)
Document Number:
IEEE S802.16m-09/0890r1
Date Submitted:
2009-4-27
Source:
Zheng Yan-Xiu, Yu-Chuan Fang, Chang-Lan Tsai, Chung-Lien Ho, Hsi-Min Hsiao
E-mail: zhengyanxiu@itri.org.tw.
ITRI
Venue:
Re: IEEE 802.16m-09/0020, Call for contributions on 16m AWD content.
Amendment Working Document (IEEE 802.16m-09/0010r1a).
Chapter 15.3.9.2.2 UL HARQ feedback control channel
Base Contribution:
Purpose:
To be discussed and approval by IEEE 802.16m TG
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Motivation
• This contribution proposes uplink control PHY structure for
tri-state HARQ feedback
• The feedback facilitates HARQ buffer management by three
states ACK/NACK/DROP
• The buffer management occurs for high throughput scenario
and each HARQ process will carry large HARQ burst
• Since larger burst applied in this scenario, we can apply more
resource for the tri-state HARQ feedback
1-bit HARQ feedback
• Four orthogonal sequences indexes ACK/NACK
• Each MS chooses one sequence from even numbered channel
or odd number numbered channel
• The MS sends the chosen sequence as the HARQ feedback
Sequence index
Orthogonal sequence
1-bit Feedabck
0
[+1 +1 +1 +1]
Even numbered channel ACK
1
[+1 -1 +1 -1]
Even numbered channel NACK
2
[+1 +1 -1 -1]
Odd numbered channel ACK
3
[+1 -1 -1 +1]
Odd numbered channel NACK
Tri-State HARQ feedback
• Three sequences are chosen from orthogonal sequences.
• The power boosting level is identical to 1-bit HARQ
feedback
Sequence index
Orthogonal sequences
Tri-state HARQ feedback
0
[+1 +1 +1 +1]
ACK
1
[+ 1 +1 -1 -1]
NACK
2
[+1 -1 +1 -1]
DROP
3
[+1 - 1 -1 +1]
Reserved
2
Nine-State HARQ feedback
• Nine sequences constructed by orthogonal sequences with linear
combination.
• Unified receiver architecture can be applied
• The power boosting level is identical to 1-bit HARQ feedback
Sequence
index
0
Sequences
[-0.6124+3.4729j 2.9141 + 0.5138j 1.264 + 0.2229j 0.187-1.0607j]
Nine-state HARQ
feedback
ACK/ACK
1
[-0.6124-0.2229j -1.264+3.4729j -0.187+0.5138j 2.9141+1.0607j]
ACK/NACK
2
[-0.6124+1.0607j -1.8371-1.0607j 1.8371+1.0607j -1.8371+3.182j]
ACK/DROP
3
[-0.6124-0.5138j 0.187-0.2229j -2.9141+3.4729j -1.264-1.0607j]
NACK/ACK
4
[-0.6124+0.5138j 0.187+0.2229j -2.9141-3.4729j -1.264+1.0607j]
NACK/NACK
5
[-0.6124-1.0607j -1.8371+1.0607j 1.8371-1.0607j -1.8371-3.182j]
NACK/DROP
6
[-0.6124+0.2229j -1.264-3.4729j -0.187-0.5138j 2.9141-1.0607j]
DROP/ACK
7
[-0.6124-3.4729j 2.9141-0.5138j 1.264-0.2229j 0.187+1.0607j]
DROP/NACK
8
[4.899
DROP/DROP
0
0
0
]
Simulation Environment
• HMT is referred to AWD
• Simulation parameters are referred
Channel Bandwidth
to EVM
time
10MHz
Over-sampling
Factor
28/25
C0,1
C0,0
C0,1
C0,0
C0,1
FFT Size
1024
C0,2
C0,3
C0,2
C0,3
C0,2
C0,3
Cyclic prefix (CP)
ratio
1/8
C1,0
C1,1
C1,0
C1,1
C1,0
C1,1
Channel condition
PB3, VA120, VA350
C1,2
C1,3
C1,2
C1,3
C1,2
C1,3
The number of
antennas
Tx:1, Rx:2
C2,0
C2,1
C2,0
C2,1
C2,0
C2,1
Modulation
BPSK/MPSK
C2,2
C2,3
C2,2
C2,3
C2,2
C2,3
FMT size
2x6
Receiver
HARQ FB: non-coherent
detection, MLD
…...
frequency
C0,0
…...
HARQ
FBCH
1, 2
HARQ
FBCH
3, 4
HARQ
FBCH
5, 6
Performance Comparison
• Tri-State HARQ
feedback provides
similar performance to
1-bit HARQ feedback
• Nine-State HARQ
feedback provides
similar performance to
1-bit HARQ feedback
Conclusion
• The proposed tri-state HARQ feedback provides
better performance than 1-bit HARQ feedback
• Nine-state HARQ feedback provide similar
performance to 1-bit HARQ feedback with identical
radio resource
• Recommend to adopt the proposed text #6 in
C802.16m-09/0894r2
• Recommend to adopt the proposed text #7 in
C802.16m-09/0894r2