Research On Radio Resource Management In Mobile Communications System

The increment of user's number and the emergence of new service's type require the mobile communications system improve its data-transmitting-rate, stability and reliability. Expanding the bandwidth and enlarging the signal's power are the direct ways to realize that goal. But the available way is improving the efficiency of radio resources, because radio spectrum and power are the sparest resources in mobile communications system.Resource scheduling algorithm is used to allocate system resource, with the intention of enhancing system efficiency and guaranteeing Quality of Service (QoS) requirements, in mobile communications system.Packet Scheduler in wireless network is used to queue various kinds of data packets, allocate wireless resources, e.g. channel codes, time slots and frequency and improve the utilization efficiency of wireless resources so as to satisfy kinds of user's service demand. This dissertation, we mainly focus on packet scheduling algorithms in Distributed Antennas System(DAS).Firstly, based on the universal wireless communication system, we analyze the working characteristics and associated researching background of packet scheduling algorithms. We upbuild a scheduling model of dynamic bandwidth allocation, including four kinds traffic types, and analyze it from viewpoint of mathematics. Secondly, we analyze the three packet scheduling algorithms, which including Round Robin, Max C/I and Proportional Fairness in Distributed Antennas System. We compare several performance including the Capacity, Packet Call Delay and user fairness by theory analyzing and computer simulation.Based on Proportional Fairness algorithm, take the channel state and the QoS of various traffic types into count, we proposed a new algorithm. And we analyzed their performance through theory analyzing and computer simulation.