Transcript IEEE C802.16m-09/1466

Uplink Control PHY Design for HARQ Tri-State Feedback
IEEE 802.16 Presentation Submission Template (Rev. 9)
Document Number:
IEEE C802.16m-09/1466
Date Submitted:
2009-7-6
Source:
Zheng Yan-Xiu, Yu-Chuan Fang, Chang-Lan Tsai, Chung-Lien Ho
E-mail: [email protected].
ITRI
Venue:
IEEE 802.16m-09/0028r1, Call for contributions on 16m AWD content
“Comments on AWD 15.3.9.2.2 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 based on existing 1-bit 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
Simulation Environment
• HMT is referred to AWD
• Simulation parameters are referred
to EVM
time
C0,1
C0,0
C0,1
C0,0
C0,1
C0,2
C0,3
C0,2
C0,3
C0,2
C0,3
C1,0
C1,1
C1,2
C1,3
…...
frequency
C0,0
C1,0
C1,1
C1,0
C1,1
C1,2
C1,3
C1,2
C1,3
Channel Bandwidth
10MHz
Over-sampling Factor 28/25
…...
FFT Size
1024
Cyclic prefix (CP)
ratio
1/8
Channel condition
PB3, VA120, VA350
The number of
antennas
Tx:1, Rx:2
Modulation
BPSK/MPSK
C2,0
C2,1
C2,0
C2,1
C2,0
C2,1
FMT size
2x6
C2,2
C2,3
C2,2
C2,3
C2,2
C2,3
Receiver
HARQ FB: non-coherent
detection, MLD
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
• This contribution provides uplink control physical
layer structure for tri-state HARQ feedback
• The structure renders similar performance comparing
to 1-bit HARQ feedback
[Add the following subclause at the end of 15.3.9.2.2]
15.3.9.2.2.1 Aggressive HARQ feedback control channel
To apply the HARQ buffer management by using tri-state feedback, e.g., ACK,
NACK, and DROP, the mapping of the tri-state HARQ feedback to its
corresponding feedback sequences are shown in Table ZYX.
Table ZYX––Orthogonal sequences for UL tri-state HARQ feedback channel
Sequence index
Orthogonal sequence
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