Research On Resource Allocation Algorithm In Wireless Body Area Networks

In traditional wireless body area network that consists of multiple sensors powered by batteies with limited capacity,sensors may run out of energy due to long-term opera-tion,and replacing the batteries will be expensive for implanted nodes or some wearable devices.Wireless powered communication technology provide an effective solution for the energy limitation problem.It benefits the sustainable operation of nodes and pro-long the lifetime of network by utilizing energy sources from the radio frequency energy sources to provide energy for nodes.It is of great significance of research on resource allocation algorithm since the transmission performance optimization is closely related to the resource allocation(such as time resources,power resources and link resources).We mainly focus on the design of resource allocation algorithm.Multi-tier wireless body area networks usually includes intra-tier network that con-sists of wearable devices or implanted devices and the sink,and,inter-tier network that consists of the sink and the base station or the access point.sink can be regarded as a relay to bridge the low-powered devices(sources)and the base station(destination),which helps the data transmission and provides energy for low-powered devices.In the existing resource allocation algorithms for scenarios being suitable for multi-tier network,the sink(the relay)operates in half-duplex mode,which has lower resource utilization,low throughput and high delay.To utilize resource efficiently and improve the transmission performance,in this dissertation,the resource allocation algorithms are designed for single wireless body area network and multiple networks with the combi-nation of the full-duplex and wireless powered transfer technology.(1)This dissertation mainly focuses on the design of the resource allocation al-gorithm for intra-tier and inter-tier communication:the relay operates on full-duplex mode,can transfer energy to the sources,receive information from the sources and trans-mit information to the destination.The resource allocation algorithm that jointly con-siders the data scheduling and power allocation is proposed to maximize the weighted throughput of the system.The data scheduling determines the sensor to be scheduled to transmit packets and the packet buffered in the relay to be scheduled.The power allo-cation adjusts the transmission power of the source and relay dynamically according to the energy state and channel state.(2)In this dissertation,we focus on the resource allocation for multiple wireless body area networks.Time is divided into two phases:energy transfer phase and data transmission phase.In the energy transfer phase,the relay transfers energy to the de-vices via wireless power transfer.In the data transmission phase,the incoming link and outgoing link of a full-duplex relay can be scheduled to receive and transmit packets simultaneously and the link of different relays can also be scheduled simultaneously,which improves the flexibility of link scheduling and the amount of data transmitted.The resource allocation algorithm maximizes the weighted throughput of the system by jointly optimizing the time resource allocation,power resource allocation,the traffic allocation for multiple flows and link scheduling.