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Open Access
Achieving Hidden-Terminal-Free Channel Assignment in IEEE802.11-Based Multi-Radio Multi-Channel Wireless Mesh Networks

Yi TIAN, Takahiro NOI, Takuya YOSHIHIRO

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Summary :

Wireless Mesh Networks (WMNs) are often designed on IEEE 802.11 standards and are being widely studied due to their adaptability in practical network scenarios, where the overall performance has been improved by the use of the Multi-Radio and Multi-Channel (MRMC) configuration. However, because of the limitation on the number of available orthogonal channels and radios on each router, the network still suffers from low throughput due to packet collisions. Many studies have demonstrated that the optimized channel assignment to radio interfaces so as to avoid interference among wireless links is an effective solution. However, no existing channel assignment scheme can achieve hidden-terminal-free transmission and thus avoid communication performance degradation given the limited number of orthogonal channels. In this paper, we propose a new static channel assignment scheme CASCA (CSMA-aware Static Channel Assignment) based on a Partial MAX-SAT formulation of the channel assignment problem that incorporates a CSMA-aware interference model. The evaluation results show that CASCA achieves hidden-terminal-freedom in both grid and random topology networks with 3-4 orthogonal channels with preservation of network connectivity. In addition, the network simulation results show that CASCA presents good communication performance with low MAC-layer collision rate.

Publication
IEICE TRANSACTIONS on Communications Vol.E104-B No.7 pp.873-883
Publication Date
2021/07/01
Publicized
2020/12/23
Online ISSN
1745-1345
DOI
10.1587/transcom.2020EBP3128
Type of Manuscript
PAPER
Category
Wireless Communication Technologies

Authors

Yi TIAN
  Wakayama University
Takahiro NOI
  Wakayama University
Takuya YOSHIHIRO
  Wakayama University

Keyword