Enhancement of CSMA/CA and Network Coding in Single-Relay Multi-User Wireless Networks

被引:3
|
作者
Huang, Chun-Hsiang [1 ]
Umehara, Daisuke [2 ]
Denno, Satoshi [2 ]
Morikura, Masahiro [2 ]
Sugiyama, Takatoshi [1 ]
机构
[1] NTT Corp, NTT Access Network Serv Syst Labs, Yokosuka, Kanagawa 2390847, Japan
[2] Kyoto Univ, Grad Sch Informat, Kyoto 6068501, Japan
关键词
single relay multi user networks; network coding; CSMA/CA; CWmin optimization; wireless throughput fairness;
D O I
10.1587/transcom.E93.B.3371
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Network coding is a promising technique for improving system performance in wireless multihop networks In this paper the throughput and fairness in single relay multi user wireless networks are evaluated The carrier sense multiple access with collision avoidance (CSMA/CA) protocol and network coding are used in the medium access control (MAC) sublayer in such networks The fairness of wireless medium access among stations (STAs) the access point (AP) and the relay station (RS) results in asymmetric bidirectional flows via the RS as a result the wireless throughput decreases substantially To overcome this problem an autonomous optimization of minimum contention window size is developed for CSMA/CA and network coding to assign appropriate transmission opportunities to both the AP and RS By optimizing the minimum contention window size according to the number of STAs the wireless throughput in single relay multi user networks can be improved and the fairness between bidirectional flows via the RS can be achieved Numerical analysis and computer simulations enable us to evaluate the performances of CSMA/CA and network coding in single relay multi user wireless net works
引用
收藏
页码:3371 / 3380
页数:10
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