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Research on Scheduling and Multi-hop Routing in Wireless Heterogeneous Networks

Author: ZhouZuo
Tutor: LiuGan
School: Huazhong University of Science and Technology
Course: Communication and Information System
Keywords: Wireless heterogeneous networks Multi-hop Routing Vertical handover scheduling
CLC: TN929.5
Type: Master's thesis
Year: 2009
Downloads: 30
Quote: 2
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Abstract

The goal of the next generation mobile communication system is to offer users the capability of achieving anywhere and anytime network access with the full support of integrated multimedia services that require various data rates and QoS. To solve this problem, researchers present an economical and efficient proposal called wireless heterogeneous networks. That is constructing a comprehensive efficient and stable globle communication system by combining various wireless networks together through Internet technology on the basis of the existing network equipment, while allowing of the independency and diversity among these wireless networks. In this dissertation, the problems of scheduling and multi-hop routing in heterogeneous wireless networks are intensively studied.In chapter 2 of this dissertation, the author studies the multi-hop routing problems in wireless heterogeneous networks and proposes two improved schemes according to the limitations of the current routing protocols. One is the flow controlled danymic source routing (F-DSR). To reduce the cost of the routing information stored in the head of the data packets of danymic source routing (DSR), the author proposes a distributed routing protocol named F-DSR, which inserts the“flow”conception into the traditional DSR. It deletes the forward addresses sequence of datagram and introduces the flow ID and routing forward table, which improves the traffic efficiency significantly especially if the address lenghth is large and the communication distance is long, while preserving the superiority in mobility management of DSR. The other is the centrally controlled source routing (CCSR). Most of the current multi-hop routing protocols don’t pay attention to the new phenomena caused by the wireless heterogeneous networks, such as multi-mode terminal and vertical handoff. CCSR protocol combines the proactive routing and reactive routing in a novel way, and preserves the both advantages, so it belongs to a trade-off scheme and is more fiter for heterogeneous networks.In chapter 3 of this dissertation, the author studies the scheduling problems in wireless heterogeneous networks and proposes an improved scheme called the scheduling algorithm based on link condition (SALC) on the basis of the multi-mode simultaneous service model. This algorithm will put packet loss rate of the physical channel and retransmission into account, recalculate the transmission delay, and choose the interface with the least delay as the best transmitting interface. SALC overcomes the limitation of the current earliest delay path first (EDPF) algorithm, which regards the channel as ideal channel, and ignores the throughput decrease caused by packet loss, that will reduce the performance in execrable communication environment. Simulations validate this model and comparisons with other mechanisms show that SALC can improve the whole network throughput obviously especially when the transmission link is dirty.Chapter 4 of this dissertation concludes this dissertation, and presents some suggestions for future research on some issues.

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