A Dual-Channel MAC Protocol with Directional Antennas for Mobile Ad-Hoc Networks

Chang-Nam KANG  Doo-Yeong YANG  Jeong-Woo JWA  

Publication
IEICE TRANSACTIONS on Communications   Vol.E90-B   No.11   pp.3266-3270
Publication Date: 2007/11/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e90-b.11.3266
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Network
Keyword: 
ad-hoc networks,  medium access control (MAC),  dual-channel,  directional antennas,  

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Summary: 
The directional MAC protocols improve spatial reuse, but require the exact location of destination and have the problem of deafness. In this paper, we propose a dual-channel MAC protocol with directional antennas for mobile ad-hoc networks. In the proposed MAC protocol, RTS/CTS are sent omnidirectionally as nodes do not have the exact location of the destination in mobile environments. Omnidirectional transmissions on control channel overcome deafness, but have low spatial reuse. We propose a new blocking algorithm to improve spatial reuse on control channel. We use the negative CTS (NCTS) to solve the exposed terminal problem. We confirm throughput of the proposed MAC protocol by simulations using Qualnet ver. 3.8 simulator.