摘要： 针对超宽带媒体访问控制(MAC)层的信道资源分配在可变比特率业务和不定比特率业务中可能存在的丢帧或带宽利用率低的问题，提出了一种基于开槽ALOHA协议即时抢占信道时间分配的改进方法，为数据流分配空闲的信道时间。仿真结果表明，与IEEE802.15.3建议的分配方式相比，这种改进方法能够在一定程度上降低任务失败率和延迟抖动，提高有效吞吐量，从而有效地支持高QoS要求的传输。

关键词: 超宽带, 媒体访问控制, 信道时间分配

Abstract: An improved method of occupying channel time allocation groups based on slotted ALOHA is presented to assign leisure channel time for data flows. This new method can avoid the problems of frame losing or low bandwidth efficiency occurring in the services of VBR and UBR adopting the resource allocation scheme recommended by the criterion of UWB MAC layer. Simulation results show that the scheme can reduce the job failure rate (JFR) and delay jitter, and increase the throughput to a certain extent compared to the scheme suggested by IEEE802.15.3. The transmission with higher QoS can be achieved consequently.

Key words: ultra-wideband(UWB), media access control(MAC), channel time allocation

中图分类号: 

• TP393