摘要
Existing multi-channel Medium Access Control (MAC) protocols have been demonstrated to significantly increase wireless network performance compared to single channel MAC protocols. Traditionally, the channelization structure in IEEE 802.11 based wireless networks is pre-configured, and the entire available spectrum is divided into subchannels and equal channel widths. In contrast, this paper presents a Traffic-Aware Channelization MAC (TAC-MAC) protocol for wireless ad hoc networks, where each node is equipped with a single half duplex transceiver. TAC-MAC works in a distributed, fine-grai-ned manner, which dynamically divides variable-width subchannels and allocates subchannel width based on the Orthogonal Frequency Division Multiplexing (OFDM) technique according to the traffic demands of nodes. Simulations show that the TAC-MAC can significantly improve network throughput and reduce packet delay compared with both fixed-width multi-channel MAC and single channel 802.11 protocols, which illustrates a new paradigm for high-efficient multi-channel MAC design in wireless ad hoc networks.
Existing multi-channel Medium Access Control （MAC） protocols have been demonstrated to significantly increase wireless network performance compared to single channel MAC protocols. Traditionally, the channelization structure in IEEE 802.11 based wireless networks is pre-configured, and the entire available spectrum is divided into sub- channels and equal channel widths. In contrast, this paper presents a Traffic-Aware Channeli- zation MAC （TAC-MAC） protocol for wire- less ad hoc networks, where each node is equi- pped with a single half duplex transceiver. TAC-MAC works in a distributed, fine-grai- ned manner, which dynamically divides vari- able-width sub-channels and allocates sub- channel width based on the Orthogonal Fre- quency Division Multiplexing （OFDM） tech- nique according to the traffic demands of nodes Simulations show that the TAC-MAC can sig- nificantly improve network throughput and reduce packet delay compared with both fixed- width multi-channel MAC and single channel 802.11 protocols, which illustrates a new parad- igm for high-efficient multi-channel MAC design in wireless ad hoc networks.
基金
supported by the National Natural Science Foundation of China under Grant No. 61002032
the Doctoral Fund of Ministry of Education of China under Grant No. 20094307110004
作者简介
SHI Chunguang, is currently a Ph.D. candidate in National University of Defense Technology, Changsha,China. His research interests include cooperative communications, cross-layer design and optimization, and multi-channel MAC protocol design for wireless ad hoc networks. Emaii： c.g.shi@nudt.edu.cnZHAO Haitao, received his Ph.D. degree in informa- tion and communication engineering from National University of Defense Technology, China. He is a Lecturer of College of Electronic Science and Engi- neering in National University of Defense Technology. His main research interests include available band- width estimation in wireless networks, cognitive and cooperative communications, cross-layer design and optimization, and multi-channel MAC protocol de- sign. Email： haitaozhao@nudt.edu.cnZHANG Shaojie, is currently a Ph.D. candidate in National University of Defense Technology, Changsha China. His research interests include wireless network protocol performance analysis and multi-channel MAC protocol design.IVlA Dongtang, received his Ph.D. degree in informa- tion and communication engineering from National University of Defense Technology, China. He is a Professor of College of Electronic Science and Engi- neering in National University of Defense Technology. His research interests include several aspects of co- operative communication and network： cooperative MIMO, cooperative MAC protocol, multi-user MIMO, cooperative transmit beam forming as weLL as multi- channel MAC protocol design.WEI Jibo, received his Ph.D. degree in electronic engineering from Southeast University, China. He is currently a Professor and Director of the Department of Communication Engineering in National University of Defense Technology, Changsha, China. His re- search interests include wireless network protocol and signal processing in communications, more spe- cifically, the areas of MIMO, multicarrier transmission, cooperative communication, and cognitive network. He is a senior member of China Institute of Commu- nications.
