摘要：

无线体域网应用的关键问题之一是在每个时隙内选择合适的传感器节点传输来最大化网络生存期。为此,针对带有中继转发的无线体域网,在能量受限的情况下分析决定网络生存期的因素。从主节点和整个网络的角度分别给出网络生存期的2种定义,并以信道状态信息和节点剩余能量为考核指标,提出4种中继选择策略。仿真结果表明,第2种网络生存期的定义充分利用了网络中传感器节点的能量资源,而选择两跳信道增益之和最大的传输策略则可以使网络生存期达到全局最优。

关键词: 无线体域网, 中继选择, 网络生存期, 信道状态信息, 剩余能量

Abstract:

When Wireless Body Area Network(WBAN)is applied,one of the key issues is the selection of appropriate sensor node in each time slot to maximize the network lifetime.The factors that determine the lifetime of WBAN with relays are investigated,in the case of energy limitation.From the point of view of the main node and the whole network,two definitions of network lifetime are given.Meanwhile,four relay selection strategies are proposed based on the channel state information and the residual energy of nodes.Simulation results show that the second definition of network lifetime makes full use of the sensor nodes energy resource,and the strategy which selects the maximum sum of the two-hop channel gains can make the network lifetime reach global optimum.

Key words: Wireless Body Area Network(WBAN), relay selection, network lifetime, channel state information, residual energy

中图分类号: 

• TN925