QoS-Aware Cooperative and Opportunistic Scheduling Exploiting Multi-user Diversity for Rate Adaptive Ad Hoc Networks
The recent researches in wireless networks prompt the opportunistic transmission that exploiting channel fluctuations to improve the overall system performance. In wireless ad hoc networks, nodes may have packets destined to multiple neighboring nodes. We
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Abstract. The recent researches in wireless networks prompt the opportunistic transmission that exploiting channel fluctuations to improve the overall system performance. In wireless ad hoc networks, nodes may have packets destined to multiple neighboring nodes. We consider an opportunistic scheduling that takes advantage of time-varying channel among different receivers to improve system performance. Maximizing overall throughput and satisfying QoS requirements for transmission flows are two important objectives that need to be considered. In literature, many opportunistic scheduling policies for ad hoc networks have been proposed, in which each transmitter schedules the transmission independently. However, due to co-channel interference, the decisions of neighboring transmitters are highly correlated. Moreover, to achieve the QoS requirements, nodes have to be cooperative to share the common wireless channel. In this paper, we formulate the opportunistic scheduling problem taking the interaction among the neighboring transmitters into account. We present an optimal scheduling policy which maximizes the overall network performance while satisfying QoS requirements of individual flows. We also proposed COS, a distributed Cooperative and Opportunistic Scheduling algorithm, which modifies IEEE 802.11 protocol to implement the optimal scheduling policy by exchanging average channel conditions and QoS factors among 2-hop neighboring nodes. Simulation results indicate that our implementation achieves higher network throughput and provides better QoS support than existing work.
Biography Prof. Zhisheng Niu graduated from Northern Jiaotong University (currently Beijing Jiaotong University), Beijing, China, in 1985, and got his M.E. and D.E. degrees from Toyohashi University of Technology, Toyohashi, Japan, in 1989 and 1992, respectively. In 1994, he joined with Tsinghua University, Beijing, China, where he is now a full professor at the Department of Electronic Engineering. He is also an adjunction professor of Beijing Jiaotong University. From April 1992 to March 1994, he was with Fujitsu Laboratories Ltd., Kawasaki, Japan. From October 1995 to February 1996, he was a visiting research fellow of the Communications Research Laboratory of the Ministry of Posts and Telecommunications of Japan. From February 1997 to February 1998, he was a visiting senior researcher of Central H. Zhang et al. (Eds.): MSN 2007, LNCS 4864, pp. 3–4, 2007. © Springer-Verlag Berlin Heidelberg 2007
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Z. Niu
Research Laboratory, Hitachi Ltd. He received the PAACS Friendship Award from the Institute of Electronics, Information, and Communication Engineers (IEICE) of Japan in 1991 and the Best Paper Award (1st prize) from the 6th Chinese Youth Conference on Communication Technology in 1999. He also received the Japanese Government Research Awards for Foreign Specialists from Science and Technology Agency (STA) of Japan and the Award for the Telecommunications Advancement Research Fellowship from Telecommunication Advancement Organization (TAO) o
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