Research Of Wireless Packet Scheduling Algorithm Based On RoF System

Since 1990s, with the development of mobile communication, the number of users increased aggressively. Meanwhile, the services of mobile communication has been developed from voice service at the very beginning to the multimedia services that the 3G can provide, the future mobile communication will provide omnipresent service and global services at the foundation of the former. The increase of the kinds of mobile services and the users'number causes the lack of radio frequency resource relatively, many new technology emerge at the times require. RoF is just one of the most representative technologies, combining with it , the mobile system can increase the capacity and simplify the structure of the Base station. This dissertation will research the wireless resource scheduling algorithm in several aspects as follows.Firstly, this dissertation presents RoF technology and the HDR transmitting technology which is used in CDMA2000 system, moreover analyses the system's capacity; then expounding the network model and cell structure of a CDMA2000 system which is combined with RoF system. This can provide a network basis for the research of scheduling algorithm.Secondly, analyzing the development of the research on scheduling algorithm, and discussed the flow of three main scheduling algorithms in detail. Compared with the other algorithm in terms of system capacity and fairness, the PFS algorithm can be considered as a tradeoff between system capacity and fairness. Moreover, the fairness rule is introduced, by which the performance of the PFS algorithm is studied again. Then analyses PFS, indicating the problem in practice and makes some improvements.Thirdly, on the basis of PFS, according to the characteristic of RoF-CDMA2000 system, brings forward a improving algorithm focusing on multi services and frequent switch, designing"voiding hungry"and bandwidth compensation scheme. Simulating the new algorithm and three other algorithms, after analyzing, we can conclude that the new is much better in improving the system capacity.Finally, summarizes the shortage of the new algorithm in design and simulation established the direction for further research.