IEEE 802.15 <subject>

1
Project IEEE P802.15 Working Group for Wireless
Personal Area Networks (WPANs) Submission Title
Delayed Negative Acknowledgement
(Dly-NACK) Date Submitted 30 April,
2004 Source Jinwoo Hong, Inhwan Kim, Dae-kyu
Bae, Hyunah Sung Company Samsung
Electronics Address 416 Maetan-3Dong,
Yeongtong-Gu, Suwon-City, Gyeonggi-Do, South
Korea Voice82-31-200-3749, FAX
31-200-3350, E-Mailjinoo2k_at_samsung.com Re
Abstract Delayed Negative Acknowledgement
method for IEEE 802.15.X WPAN Purpose For
discussion to add delayed negative
acknowledgement with using delayed
acknowledgement Notice This document has been
prepared to assist the IEEE P802.15. It is
offered as a basis for discussion and is not
binding on the contributing individual(s) or
organization(s). The material in this document is
subject to change in form and content after
further study. The contributor(s) reserve(s) the
right to add, amend or withdraw material
contained herein. Release The contributor
acknowledges and accepts that this contribution
becomes the property of IEEE and may be made
publicly available by P802.15.
2
Delayed Negative Acknowledgement(Dly-NACK)

• May 2004

3
Abstract

• We propose an acknowledgement method named
  Delayed Negative Acknowledgement used with
  Delayed Acknowledgement.
• by using Dly-NACK, Dly-(N)ACKs frame length is
  always smaller than or equal to Dly-ACKs
  without Dly-NACK

4
MAC Header for Dly-(N)ACK

• MAC Header

octets1
3
1
1
2
2
Stream Index
Fragmentation Control
SrcID
DestID
PNID
Frame Control
bits b15-b11
b10
b9
b8-b7
b6
b5-b3
b2-b0
Reserved
More Data
Retry
ACK policy
SEC
Frame Type
Protocol Version
b5 b4 b3
Frame type description
000 001 010 011 100 101 110-111
Beacon frame Immediate ACK (Imm-ACK)
frame Delayed ACK (Dly-ACK) frame Command
frame Data frame Delayed Negative ACK (Dly-NACK)
frame Reserved
5
Acknowledgement Format

• Dly-ACK
• Dly-NACK

octets 4
2

2
2
1
1
1
10
FCS
MPDU ID block-n

MPDU ID block-2
MPDU ID block-1
MPDUs ACKed
MAX Frames
MAX Burst
MAC header
octets 4
2

2
2
1
1
1
10
FCS
MPDU ID block-n

MPDU ID block-2
MPDU ID block-1
MPDUs NACKed
MAX Frames
MAX Burst
MAC header
bits b15-b9
b8-b0
Fragment Number
MSDU Number
6
How to make Dly-NACK Frame

• Basic Rule
• Put the MPDU block with the MPDUs of frames which
  are not received at the receiver.
• Put the number of MPDU blocks to MPDUs NACKed
  field
• Fill the other fields with appropriate values
  with the same calculation in Dly-ACK

7
How to fill MPDU blocks

• If the receiver does not see
• MSDU with Fragment Number(FN)
• MPDU MSDU FN
• whole MSDU
• MPDU MSDU b111_1111
• If the last fragment number is b111_1111
• use Dly-ACK

MPDU Block
bits b15-b9
b8-b0
Fragment Number
MSDU Number
8
When is the Dly-(N)ACK used?

• If the received frames are more than lost ones
• Dly-NACK will be used
• If the received frames are less than lost ones
• Dly-ACK will be used

9
Using Dly-NACK

• The same negotiation in Dly-ACK
• except
• Dly-NACK Frame
• Dly-NACK 0
• There is no MPDU block

Negotiation in Dly-ACK
10
Use Case I
received frame
FN
MSDU
lost frame
FN
MSDU
0
0
0
1
0
2
0
3
0
4
0
5
Dly-NACK
0
6
octets4
1
1
1
10
0
7
FCS
MPDUs NACKed (0)
MAX Frames
MAX Burst
MAC header
0
8
0
9
Dly-ACK
octets4
2
2
2
2
2
2
2
2
2
2
1
1
1
10
FCS
MPDU ID block (0, 9)
MPDU ID block (0, 8)
MPDU ID block (0, 7)
MPDU ID block (0, 6)
MPDU ID block (0, 5)
MPDU ID block (0, 4)
MPDU ID block (0, 3)
MPDU ID block (0, 2)
MPDU ID block (0, 1)
MPDU ID block (0, 0)
MPDUs ACKed (10)
MAX Frames
MAX Burst
MAC header
11
Use Case II
received frame
FN
MSDU
lost frame
FN
MSDU
0
0
0
1
0
2
0
3
0
4
0
5
Dly-NACK
0
6
octets4
2
2
1
1
1
10
0
7
FCS
MPDU ID block (7F, 7)
MPDU ID block (7F, 3)
MPDUs NACKed (2)
MAX Frames
MAX Burst
MAC header
0
8
0
9
Dly-ACK
octets4
2
2
2
2
2
2
2
2
1
1
1
10
FCS
MPDU ID block (0, 9)
MPDU ID block (0, 8)
MPDU ID block (0, 6)
MPDU ID block (0, 5)
MPDU ID block (0, 4)
MPDU ID block (0, 2)
MPDU ID block (0, 1)
MPDU ID block (0, 0)
MPDUs ACKed (8)
MAX Frames
MAX Burst
MAC header
12
Use Case III
received frame
FN
MSDU
lost frame
FN
MSDU
0
0
0
1
0
2
0
3
0
4
0
5
Dly-ACK
0
6
octets4
2
2
1
1
1
10
0
7
FCS
MPDU ID block (0, 7)
MPDU ID block (0, 3)
MPDUs ACKed (2)
MAX Frames
MAX Burst
MAC header
0
8
0
9
Dly-NACK
octets4
2
2
2
2
2
2
2
2
1
1
1
10
FCS
MPDU ID block (7F, 9)
MPDU ID block (7F, 8)
MPDU ID block (7F, 6)
MPDU ID block (7F, 5)
MPDU ID block (7F, 4)
MPDU ID block (7F, 2)
MPDU ID block (7F, 1)
MPDU ID block (7F, 0)
MPDUs NACKed (8)
MAX Frames
MAX Burst
MAC header
13
Use Case IV
received frame
FN
MSDU
lost frame
FN
MSDU
0
0
1
0
2
0
3
0
0
1
1
1
Dly-NACK
2
1
octets4
2
2
2
1
1
1
10
3
1
FCS
MPDU ID block (0, 1)
MPDU ID block (3, 1)
MPDU ID block (3, 0)
MPDUs NACKed (3)
MAX Frames
MAX Burst
MAC header
4
1
5
1
Dly-ACK
octets4
2
2
2
2
2
2
2
1
1
1
10
FCS
MPDU ID block (5, 1)
MPDU ID block (4, 1)
MPDU ID block (2, 1)
MPDU ID block (1, 1)
MPDU ID block (2, 0)
MPDU ID block (1, 0)
MPDU ID block (0, 0)
MPDUs ACKed (7)
MAX Frames
MAX Burst
MAC header
14
Enhancement

• To Save ACK length with Dly-NACK
• Lsave Nrecv Nlost x 2 bytes
• where
• Nrecv number of received frames
• Nlost number of lost frames
• To reduce total probability of Bit Error Rate
  (BER) and Frame Error Rate (FER)