Abstract
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.
Highlights
Wireless Body Area Networks (WBANs) have recently emerged as a subfield development of Wireless Sensor Networks (WSNs) and a promising technology in short-range communication area [1]to provide many important and useful applications in different domains such as vital sign monitoring, interactive gaming, and telemedicine [2,3,4]
In a body-shaped WBAN application scenario, the proposed scheme can effectively improve the network lifetime of WBANs by 11.8% at least when compared with the direct transmission strategy and is proved to be better than other existing relay selection methods
A relay selection scheme is proposed by formulating an optimization problem that considers both the energy consumption rate and residual energy of each node to maximize the minimum lifetime of the nodes in the network
Summary
Wireless Body Area Networks (WBANs) have recently emerged as a subfield development of Wireless Sensor Networks (WSNs) and a promising technology in short-range communication area [1]. In IEEE 802.15.6 [8], which is designed for WBAN communication, topology is specified commonly as a star topology and can be extended to a two-hop tree topology This extension indicates that cooperative transmission of a sensor node through a relay is an alternative choice instead of direct one-hop transmission to the coordinator. An appropriate relay selection is of great importance in cooperative transmission strategy to prolong the network lifetime of WBANs. In this paper, a relay selection scheme called the Lifetime Maximization Relay Selection Scheme (short for LMRSS) is proposed to maximize the lifetime of WBANs through formulating and solving an optimization problem where relay selection of each node acts as the optimization variable under the topology constraints specified in the IEEE 802.15.6 standard.
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