1. Simulation Results for Adaptive Rate Control
July 2005
July 2005
January 2006
Simulation Results for Adaptive Rate Control
Date:
Authors:
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Feng Li et al
Feng Li, ZTE Corporation

2. July 2005
July 2005
January 2006
Abstract
This document contains some simulation results by comparing current 11a implementation and the one using Adaptive Rate Control (doc#: 11-06/1286r1).
Feng Li et al
Feng Li, ZTE Corporation

3. July 2005
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Simulation Setups
10 workstations associated with a single AP without any hidden stations
Fixed frame size of 1000 bytes
AP runs using a DCF
The coverage is determined by transmitting 1000 bytes of frame at 6Mbps with frame error rate of 10%
The BER is based on large scale fading and small scale fading (Rayleigh distribution). The BER is then translated to FER above
Feng Li et al
Feng Li, ZTE Corporation

4. Simulation Result-1 January 2006 July 2005 July 2005 Feng Li et al
Feng Li, ZTE Corporation

5. Simulation Result-2 January 2006 July 2005 July 2005 Feng Li et al
Feng Li, ZTE Corporation

6. Backup January 2006 July 2005 July 2005 Feng Li et al
Feng Li, ZTE Corporation

7. Proposal Overview Capability exchanges
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July 2005
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Proposal Overview
Capability exchanges
Proposed frame exchange sequence
Proposed feedback rate identifier
Feng Li et al
Feng Li, ZTE Corporation

8. January 2006
Capability Exchanges
Exchange Adaptive Rate Control capability of a STA during (re)association process
Use Wireless Network Management Capability IE
doc#: 05/1070r2 (Qi et al) or 05/1076r0 (Black et al)
Proposed wireless network management capabilities field: B0 B1
B15
Adaptive Rate Control
Reserved
Bits: 1 12
Adaptive Rate Control bit will be set to 1 if STA supports and want to enable this feature
Feng Li et al

9. Procedure of ARC Capability Exchange
January 2006
Procedure of ARC Capability Exchange
Feng Li et al

10. Frame Exchange Sequence
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January 2006
Frame Exchange Sequence
Only the transmitting STA and the receiving STA that support Adaptive Rate Control shall have the frame exchange sequence enabled for Adaptive Rate Control.
On receipt of a frame the STA shall include the feedback rate in the immediate response frame addressed to the sender.
On receipt feedback rate in an immediate response frame, the sender shall transmit subsequent frames within a TXOP at the feedback rate.
Feng Li et al
Feng Li, ZTE Corporation

11. January 2006
Example of Adaptive Rate Control Based on Single Data Frame Transmission
Sender sends RTS (Rate_ID1) to Receiver, and Receiver performs forward channel quality evaluation (Rate_ID2)
Receiver sends CTS (Rate_ID1) to Sender together with feedback rate (Rate_ID2) information
Sender transmits data (Rate_ID2) to Receiver
Feng Li et al

12. Proposed Feedback Rate Identifiers
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Proposed Feedback Rate Identifiers B7 B8 B9
B10
Rate Identifier (Mbps)
No Recom. 1 6 9 12 18 24 36 48 54
4 (3) bits of Service field in PLCP header are used to specify feedback rate
802.11a: Bit b7, b8, b9 and b10
802.11b: Bitb1, b4 and b5
802.11g: Bit b0, b1 and b4
Feedback Rate identifiers for a, for example:
Feng Li et al
Feng Li, ZTE Corporation

13. January 2006
Feedback?
Feng Li et al