一种及时可靠的无线体域网络传输协议

A Timely and Reliable Transport Protocol for Body Area Networks

无线体域网络比传统传感网络要求更高的数据传输可靠性和及时性,其可靠性属于数据包级可靠。提出了一种及时可靠的无线体域网络传输协议AODV-RT,该协议考虑到节点的存储资源受限和无线体域网络数据优先级,采用E2E(EndTo-End)、HBH(Hop-By-Hop)以及E2E与HBH相结合的错误恢复机制保证数据传输的可靠性。首先在每个节点缓存优先级别最高的警报信息,提供HBH错误恢复;其次通过在中间节点位置为接收信号强度RSSI较低的后一级节点缓存优先级别较高的数据包,提供E2E与HBH相结合的错误恢复;最后对低优先级数据采取E2E错误恢复。性能分析与模拟实验表明:该协议在数据传输率、端到端延迟和能量消耗等方面优于相似协议MAODV-SIM。

The more reliability and timeliness are required in wireless body area networks （ WBAN ） compared to traditional wireless sensor networks, and all the packets are needed to be reliable. A timely and reliable protocol （ AODV-RT） is presented, considering limited memory resource of the node and the priority of the WBAN data, it guarantees reliability and timeliness utilizing error recovery of E2E （ End-To-End ）, HBH （ Hop-By-Hop ）, and combining E2E with HBH. The alarm data,which has highest priority,is cached at each node along the route path. The HBH error recovery is provided firstly;Then the error recovery combining E2E with HBH is provided for lower RSSI （ Received Signal Strength Indicator） node to caching higher priority data packet at the previous node,and finally the ETE error recovery is adopted for lower priority packet. The performance analysis and simulation experiment indicate that our protocol is more advantaged then similar MAODV-SIM in packet delivery ratio,end-to-end delay and energy consumption.