Multi-hop Wireless Network Distribute Dfrequency Allocation Mechanism

With the developing of wireless communication technologies and the rush of mediaservice, telecommunication is moving to broadband and mobile. Broadband and Mobileis becoming the key features of wireless communication systems. With the advantagesof supporting multi-hopping connection, wide covering range, flexible networking andcommunication while moving, multi-hop wireless technology is becoming aconsiderable wireless research aspect. In this dissertation, a double channel wirelessmulti-hop application system, which is based on IEEE802.16e, will be introduced. Thissystem not only has the feature of transmission and networking of802.16, but alsopossesses the advantage of multi-hop networking. Spectrum resource is quite costly forwireless communications. For double channel multi-hop wireless communicationsystem, frequency distribution is performed in network operation, which is able toprovide reliability and flexibility.In this dissertation, according to the research of network operation and topologicchanging of each step, a multi-hopping frequency distribution wireless implementationis proposed. Based on the fixed channel distribution and dynamic channel distributionstrategies, the nodes which are in the network are implemented with collaboration andmeasurement, the nodes which are out of the network are implemented withmeasurement. Meanwhile, according to the MAC protocol of wireless multi-hoppingnetwork, the requirements of reducing consumption of system, network flexibility andnetwork topologic changing are satisfied.The main research results are as follow:(1) Fast networking and dynamic frequency distribution are proposed:In order to solve the problems of frequency collision and networkconvergence, a dynamic frequency distribution mechanism is proposed. Themain feature of this mechanism is to reduce the frequency collision and the timeconsumption of networking.(2) To enable the stabiles of network operation, a distributed frequency distribution mechanism is proposed:The distributed frequency distribution mechanism is able to stabilize thenetwork and enhance the reliability of link.(3) A detect assisting frequency distribution mechanism, which is able to enhancethe network reforming, is proposed:This mechanism is able to solve the problems of network reforming andtime consumption when the network is broke up or combination. The mainfeature of the mechanism is the time and system consumptions are considered inthe same time.