| In MANET, topology control mechanisms control the topology of a wireless network typically by adjusting the transmission power or neighbor set of nodes, motivated by the potential benefits of reducing interference, conserving energy, reducing broadcast overhead and/or expanding network capacity. Recently, there has been increasing interests in designing topology control algorithms for MANET. However, almost all work focus on the objective of reducing the transmission power of nodes while preserving the network connectivity. Though some metrics, such as nodal degree, short path length, are correlated with certain network performance, such as delay, little work attempts to investigate the impact of topology control mechanisms on network performance. Therefore, it is still an open issue whether the potential benefits of topology control will eventually improvement in network performance, and, if so, which performance metrics may be improved. In this paper, we study the impact of the benefit of reducing broadcast overhead of topology control on network performance by integrating a topology control algorithm with a purely directional antenna-based MAC protocol, LiSL/D, for MANET. Simulation results show that, somewhat unexpected, topology control does not significantly improve the throughput; besides, topology control significantly increases the delay.
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| Dr. Zhensheng Zhang received his Ph.D. in electrical engineering from the University of California, Los Angeles. He is currently with San Diego Research Center (SDRC), Principal Investigator for several DOD projects. Before joining SDRC, he visited Microsoft Research in the summer of 2002 and worked at Sorrento Networks, Department of System Architecture, for 2 years, responsible for designing the next-generation optical metro networks using the GMPLS control framework. Prior to Sorrento Networks he was with Bell Laboratories, Lucent Technologies, focusing on research and development in ATM/SONET infrastructure and wireless networks. He has published more than 100 papers in ACM/IEEE Transactions on Networking, IEEE JSAC, IEEE Transactions on Communications, and key ACM/IEEE conferences. Currently, Dr. Zhang is Editor of IEEE Transaction on Wireless Communications. He is the General Chair of Broadband Wireless Networking Symposium, October 2004. He has served as Guest Editor for the IEEE JSAC special issue on Overlay Networks, 2003 and the Journal of Wireless Networks issue on multimedia wireless networks, August 1996. Dr. Zhang served as Member at Large of the IEEE San Diego section 2004 and as Chair of IEEE Communication Society, San Diego section, 2004-2005. His research interests include wireless ad hoc networks, wireless sensor networks. |