Transcript Slides S802.16j-08/131

Supporting martial to explain ARQ feedback IE
IEEE 802.16 Presentation Submission Template (Rev. 9)
Document Number:
IEEE S802.16j-08/131
Date Submitted:
2008-07-15
Source:
Youngbin Chang, Jungje Son, Rakesh Taori Voice:
Hyunjeong Kang
Samsung Electronics Co., Ltd.
416 Maetan-3dong, Suwon 443-742, Korea
+82-31-279-5769
E-mail:
[email protected]
Venue:
IEEE 802.16-08/028; IEEE 802.16 Letter Ballot Recirc #28d, on P802.16j/D5
Base Contribution:
IEEE C802.16j-08/131
Purpose:
Supporting material of ARQ feedback IE in C802.16j-08/131
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Explanation of ARQ feedback IE
BS
Intermediate RS
Fragmentation
TDU = 1
TDU = 2
TDU = 3
TDU = 4
TDU = 1
TDU = 2
TDU = 3
TDU = 4
TDU = 1
TDU = 1
TDU = 2
TDU = 2
TDU = 3
TDU = 4
TDU = 4
TDU = 1
TDU = 1
TDU = 2
TDU = 2
TDU = 3
TDU = 4
TDU = 4
Access RS
100
Error
200
Cumulative ACK
TSN =1
FO = 100
Proposed ACK
TSN =4
Fragmented
indication =1
Error
100
200
Error
100
200
This ACK feedback can not represent TDU =2 error and
TDU = 4 error when TDU=1 will successfully received
S_FO = 100
Last Successfully received TDU
fragment number and length
E_FO = 200
N_TSN =3
TSN =1
Fragmented
indication =1
S_FO = 100
E_FO = 200
TSN =2
Fragmented
indication =1
S_FO = 0
E_FO = 100
TSN =4
Fragmented
indication =1
S_FO = 0
E_FO = 100
Less TSN number of Error TDU or
Error TDU fragments within Last
Successfully receive TDU
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Benefits of proposed ARQ feedback IE
 Solve the only cumulative ACK ARQ feedback
• Cumulative ACK can not indicate all of received TDUs or TDU fragments in the
receiver buffer.
• Before receiving first error TDU or TDU fragment, receiver can not send
acknowledge to transmitter remaining TDU or TDU fragments in the receiver
buffer.
• Basically, cumulative + selective ACK is very useful. However, intermediate RS
fragments TDU into multiple TDU fragments, selective ACK can not be available
to indicate TDU fragments
 Befits of ARQ feedback IE
• Receiver can send ACK/NAK all of TDU or TDUs in the buffer. Therefore, fast
retransmission in the transmitter is possible.
• This ARQ feedback IE solves the problem of cumulative ACK feedback IE have
• Just sending error TDUs provides less overhead to feedback to transmitter.
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