Research On Business Scheduling Algorithm Of IEEE 802.16E Wireless Interface

Along with the development of wireless communication, IEEE 802.16e as the broadband wireless access system which has high degree of standardization, high data transmission speed, broad bestrow scope, extension ability and flexibility gradually presents the broad application prospect in high-speed Internet access, various high-speed business of data, voice and multimedia. The bandwidth of wireless network is very limited. In order to guarantee the services in wireless network to get better quality, how to make more effective use of bandwidth resources has become one of the key research problems in wireless network, and the QoS guarantee measures in IEEE 802.16e protocol makes WiMAX have more advantages on technology. In WIMAX, the schedule to real-time business is required to meet the performance of real-time and characteristics of dynamic change rate, which is also what we focus. The paper mainly studies the power control and scheduling method in resource management of mobile IEEE802.16 system. The research work of this paper are as follows:IEEE 802.16e is a supplement plan for 802.16,802.16a, it provides double support to fixed telephone service and mobile service for both enterprises and users, while the join of users'mobility makes it more important to save power,802.16e proposes the MS sleep patterns to save power. While the response time of the sleep patterns exponentially algorithm proposed by IEEE802.16e is too long in low traffic situation, to solve this problem, we propose the improved linear mixed growth algorithm on the basis of two powering saving mathematical models. This algorithm makes some improvement on the original algorithm without changing the parameters of the original standard, which has a good compatibility.Relative to the uplink WiMAX downlink transmission is more likely to cause bottlenecks. Under normal circumstances, BS schedules different business by the polling approach connections to the downlink. Under limited bandwidth circumstances, this scheduling mechanism can not guarantee the fairness of real-time traffic transmission, and its excessive delay is likely to affect the user experience. Propose a service flow for real time optimization program, especially for VolP, propose the improved schedule algorithm based on centralized queue management and dynamic packet discard. When BS schedule the downlink, it centralizes schedules the real-time services of different connection, and dynamically discards the packets that meet certain conditions according to the status of the network, so that it ensures the effective transmission of follow-up packets. In this way, it greatly reduces bandwidth usage and the packet delay, optimized jitter and guarantees a better QoS when network is congested.Uplink transmission (MS side), we improve the bandwidth request for real-time polling service and grant mechanisms, analyze the existing rtPS, ertPS algorithm, and then propose new OrtPS algorithm. The algorithm adapts to bandwidth fluctuations in the small-scale real-time polling service and improves the scheduling of this kind of business performance on the time delay, throughput etc.