Enhancement of CSMA/CA and network coding in single-relay multi-user wireless networks

Chun Hsiang Huang, Daisuke Umehara, Satoshi Denno, Masahiro Morikura, Takatoshi Sugiyama

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


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 networks.

Original languageEnglish
Pages (from-to)3371-3380
Number of pages10
JournalIEICE Transactions on Communications
Issue number12
Publication statusPublished - Dec 2010
Externally publishedYes


  • Fairness
  • Network coding
  • Single-relay multi-user networks
  • Wireless throughput

ASJC Scopus subject areas

  • Software
  • Computer Networks and Communications
  • Electrical and Electronic Engineering


Dive into the research topics of 'Enhancement of CSMA/CA and network coding in single-relay multi-user wireless networks'. Together they form a unique fingerprint.

Cite this