摘要
随着物联网应用的推广,出现了更多的低功耗高速率实时通信技术需求。IEEE 802.15.4是低功耗通信既定标准,但对高速实时传输研究较少。它不能解决多于七个设备需要实时服务、时延约束小于超帧长度的问题。为了克服这些限制,文中在EGSA算法基础上,最大化IEEE 802.15.4中CFP,保留足够多的带宽资源用于实时业务传输。为了进一步提高效率,把CFP分割成多个微小时隙,并使用最早截止时间优先(EDF)策略分配这些微小时隙。性能分析显示这种策略可以严格遵循时延约束条件,并可以提高带宽利用率。
With the promotion of the Interact of Things,lowpower highspeed realtime communication technology is more necessary. IEEE 802.15.4 is a standard of lowpower communications,but few studies on highspeed realtime transmission. It cannot solve the problem where more than seven devices require timesensitive services, and the delay constraints are smaller than the superframe dura tion. To overcome these limitations, based on the EGSA, maximize the available Contention Free Period （ CFP）, to guarantee enough bandwidth for realtime service. To further enhance efficiency, the CFP is divided into multiple small time slots which are allocated under Earliest Deadline First （EDF） scheduling policy. Performance analysis reveals that delay constraints are guaranteed efficiently and the bandwidth utilization is improved significantly.
出处
《计算机技术与发展》
2013年第3期14-18,共5页
Computer Technology and Development
基金
国家自然科学基金资助项目(60905040)
江苏省基础研究计划(自然科学基金)项目(BK2011756)
南京邮电大学科研基金项目(NY207020
NY210011
NY211009)
