With the promotion of the Internet of Things,low-power high-speed real-time communication technology is more necessary. IEEE 802. 15. 4 is a standard of low-power communications,but few studies on high-speed real-time transmission. It cannot solve the problem where more than seven devices require time-sensitive 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 real-time 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.% 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.
展开▼
