An optimized DCF schema with Downlink and Uplink bandwidth control in 802.11 WLAN

Author

Feng, Hui ; Wang, Ting ; Hu, Bo

Author_Institution

Dept. of Electron. Eng., Fudan Univ., Shanghai

fYear

2005

fDate

21-24 Nov. 2005

Firstpage

1

Lastpage

5

Abstract

In 802.11 infrastructure BSS, the channel throughput will decrease when increasing the number of competing STAs. Also severe asymmetry exists between downlink and uplink data because AP accesses the share channel without any priority. Both problems are solved by a new MAC schema which adjusts the initial contention window of AP and STA to optimized values. A new estimation method for STA number is also proposed via dynamic MAC addresses statistic at AP side. Afterwards, optimized initial contention window values are derived from a mathematical model under downlink and uplink bandwidth control. Simulation indicates that the schema proposed can estimate the channel situation exactly and improve channel throughput with downlink/uplink bandwidth control obviously.

Keywords

access protocols; channel estimation; mathematical analysis; telecommunication congestion control; wireless LAN; 802.11 WLAN; 802.11 infrastructure BSS; DCF schema; MAC schema; channel estimation; distributed coordination function; downlink bandwidth control; estimation method; initial contention window; mathematical model; optimized initial contention window values; uplink bandwidth control; Bandwidth; Counting circuits; Downlink; Mathematical model; Optimization methods; Physics; Programmable control; Statistics; Throughput; Wireless LAN;

fLanguage

English

Publisher

ieee

Conference_Titel

TENCON 2005 2005 IEEE Region 10

Conference_Location

Melbourne, Qld.

Print_ISBN

0-7803-9311-2

Electronic_ISBN

0-7803-9312-0

Type

conf

DOI

10.1109/TENCON.2005.300957

Filename

4084921