一种IEEE 802.15.6 Two-Hop 拓扑扩展转发节点选择协议

IEEE 802.15.6标准提供了一种2-Hop的星形拓扑扩展结构用于节省单跳长距离通信带来的能量消耗,但该标准没有指明如何选择转发节点的机制.本文提出了一种IEEE 802.15.62-Hop的星形拓扑扩展结构转发节点选择协议ORR,通过请求转发的Relayed节点k广播包含自己的IDk、数据产生的频率FDatak和请求转发的持续时间TreqLenk的RelayNodeDiscovery消息,请求转发节点为自己转发数据;候选Relaying节点根据自己和已为转发的其他节点数据的能量消耗,在保留自己能量阈值EThreshi的情况下,单播发出响应RelayInfo消息;RelayInfo消息包含节点i自己的IDi,平均信噪比AvgSNRik和能提供转发的最长数据时间TmaxLenik;节点k根据这些参数选择最优或重新选择转发节点,提高了网络可靠性.性能分析与模拟实验表明:该协议在网络寿命和网络吞吐量方面优于传统的IEEE 802.15.6策略.

A Protocol of Relaying Node Selection for IEEE 802.15.6 Two-Hop star Topology Extension

In order to save the energy consume caused by single-hop with long distance communication in WBAN, the IEEE 802.15.6 standard provides a 2-Hop star topology extension structure,but this standard does not specify how to select the relaying node. A relaying node selection protocol ORR based IEEE 802.15.62-Hop star topology is presented in this paper,the relayed node k broadcast its RelayNodeDiscovery message which include its IDk ,the frequency of data generated FDatak and the duration of the request forwarding TreqLenk to find a relaying node for-warding data. The candidate relaying node i according to energy consume of its own and has been forwarding for oth-er relayed nodes;In the case of retaining its own energy threshold,i unicast a response message RelayInfo which in-clude its IDi,average signal-noise ratio AvgSNRik and can provide the longest data time to forward TmaxLenik;The node k selects or re-selects the optimal forwarding node based on these parameters to improve network reliability. Performance analysis and simulation experiments show that the protocol is superior to the traditional IEEE 802.15.6 strategy in network lifetime and throughput.