State Key Laboratory of Integrated Services Networks, Xidian University, Xi'an 710071, China.
Sensors (Basel). 2017 Jun 2;17(6):1267. doi: 10.3390/s17061267.
Network Lifetime is one of the most important metrics in Wireless Body Area Networks (WBANs). In this paper, a relay selection scheme is proposed under the topology constrains specified in the IEEE 802.15.6 standard to maximize the lifetime of WBANs through formulating and solving an optimization problem where relay selection of each node acts as optimization variable. Considering the diversity of the sensor nodes in WBANs, the optimization problem takes not only energy consumption rate but also energy difference among sensor nodes into account to improve the network lifetime performance. Since it is Non-deterministic Polynomial-hard (NP-hard) and intractable, a heuristic solution is then designed to rapidly address the optimization. The simulation results indicate that the proposed relay selection scheme has better performance in network lifetime compared with existing algorithms and that the heuristic solution has low time complexity with only a negligible performance degradation gap from optimal value. Furthermore, we also conduct simulations based on a general WBAN model to comprehensively illustrate the advantages of the proposed algorithm. At the end of the evaluation, we validate the feasibility of our proposed scheme via an implementation discussion.
网络寿命是无线体域网 (WBAN) 中最重要的指标之一。本文在 IEEE 802.15.6 标准规定的拓扑约束下，提出了一种通过制定和解决一个优化问题来最大化 WBAN 寿命的中继选择方案，其中每个节点的中继选择作为优化变量。考虑到 WBAN 中传感器节点的多样性，该优化问题不仅考虑了能量消耗率，还考虑了传感器节点之间的能量差异，以提高网络寿命性能。由于它是非确定性多项式困难的 (NP-hard) 和难以解决的，因此设计了一种启发式解决方案来快速解决优化问题。仿真结果表明，与现有算法相比，所提出的中继选择方案在网络寿命方面具有更好的性能，并且启发式解决方案的时间复杂度较低，与最优值的性能下降差距可以忽略不计。此外，我们还基于一般的 WBAN 模型进行了仿真，全面说明了所提出算法的优势。在评估结束时，我们通过实施讨论验证了我们所提出方案的可行性。
