Research On Packet Scheduling Algotithm For Downlink Of B3G Mobile Communication Systems

The future of mobile communication systems will be in the trend of having a faster communication speed, more intelligent terminals and network facilities, higher spectrum efficiency and more compatible network. It will become a wideband system carrying out high data rate.Orthogonal Frequency Division Multiplexing (OFDM) becomes as a promising technology in beyond 3rd generation wireless communication system, which has the characteristic of multi-path resistance and high spectrum efficiency. Along with the booming of data service and multi-media application, wireless network has various Quality of Service requirements. The wireless packet scheduling algorithm is one of the key technologies in resource management. It will become the most important approach in realizing high spectrum efficiency and fulfilling high system capability. Meanwhile, the complexity of wireless channel and QoS requirement in wideband system have brought in new properties, and push forward higher demand in the designing of wireless scheduling algorithm.This thesis mainly focuses on the author's research in the field of downlink packet scheduling algorithms for wideband wireless communication system with diversified traffic flow on the basis of OFDM technology. Firstly, the author defines the maximum transferring rate and the proportional fairness factor based on the analysis of proportional fairness property; imports a concept of exponential cumulated delay, which makes use of the waiting time of each traffic flow to restrict the service delay and the cumulated value for adaptive compensation; makes judgment on multi-dimensional of time, frequency and user in each scheduling frame. Finally, the thesis proposed a Delay Cumulated Proportional Fairness (DCPF for short) algorithm, which...