IEEE802.16e的实时上行链路调度服务优化算法

Improved scheduling algorithm for real-time uplink services in IEEE802.16e

深入分析了IEEE802.16e建议的三种实时调度服务算法:UGS、rtPS、ertPS,并在此基础上提出了一种优化的实时调度服务算法:irtPS。该优化的调度服务算法在保证变化数据率实时上行链路的延时性能基础上,最大限度地提高了实时上行链路的资源利用率。数学建模分析结果显示,在保证延时性能的前提下,该优化的调度服务算法的系统容量较IEEE802.16e建议算法的系统容量有显著增加。

In IEEE802. 16e, Scheduling services represent the data handling mechanisms supported by the MAC scheduler for data transport on a cormection. Each connection is associated with a single scheduling service. A scheduling service is determined by a set of QoS parameters that quantify its behaviors. Taking three types of scheduling services into consideration, UGS （Unsolicited Granted Scheduling）, rtPS （real-time Polling Scheduling） and ertPS （extended real-time Polling Scheduling）, this paper proposed a real-time uplink scheduling service algorithm irtPS （improved real-time Polling Scheduling）. The proposed .algorithm maximized the usage of uplink access resource and guaranteed data rate and delay requirement. Mathematical modeling and analysis results show that the throughput performance of the proposed algorithm is better than the algorithms in IEEE802.16e on the precondition of guaranteed delay performance.