基于IEEE 802.15.4民航地面设备监控网络时延优化

OPTIMISATION OF IEEE 802.15.4-BASED AVIATION GROUND UNITS MONITORING NETWORK DELAY

机场地面设备(包括地面电源和地面空调)计量系统利用IEEE 802.15.4协议无线传感器网络WSN对地面设备的许多参数进行监测,这些数据因采集的位置不同,其重要性也不同,对实时传输和大量数据快速传输上有不同的等级要求。利用IEEE802.15.4 GTS机制,在原有的先来先服务FCFS算法的基础上,在PAN节点维护GTS请求队列,对GTS分配采取按终端节点数据重要性进行优先级抢占分配GTS,同时针对GTS请求和GTS响应的特点,对GTS Allocate请求采取保留的方式,直至GTS Deallocate到来,以保证重要数据的优先传输。仿真结果表明,采用GTS优先级调节和GTS请求保留相对于FCFS算法在数据传输快速性能上有明显的提升。

Airport metering system for ground units （including ground power unit and ground air conditioning） uses wireless sensor network （WSN） with IEEE 802.15.1 protocol to monitor a large number of parameters of the ground units. The importance of these data varies with the different collection locations, and the data also have diverse grade requirements on real-time transmission and mass data block transmission. Using IEEE 802.15.4 GTS mechanism, and on the basis of original first-come, first-served （FCFS） algorithm, the GTS request queue is maintained at PAN node, for GTS allocation, the preemptive priority allocation of GTS according to the importance of data at terminal node is adopted. Meanwhile in light of the characteristics of GTS requests and GTS responses, the way of reservation on GTS Allocate requests are used until GTS Deallocate occur, so as to guarantee the priority transmission of important data. Simulation results show that using GTS priority scheduling and GTS requests reservation, the performance of fast data transmission improves significantly with respect to the FCFS algorithm.