Number Of Wireless Body Area Networks Research Articles

Coloring-Based Channel Allocation for Multiple Coexisting Wireless Body Area Networks: A Game-Theoretic Approach

This paper addresses the coexistence problem among multiple wireless body area networks (WBANs), where co-channel interference may occur among different WBANs if the channels are not allocated properly, leading to performance degradation in both energy efficiency and packet transmission reliability. We formulate the channel allocation problem as a graph coloring problem, and develop a solution to increase the co-channel reuse and the number of WBANs with assigned channels. We propose a distributed two-hop incomplete coloring (DTIC) algorithm that adopts a game-theoretic approach to solve the graph coloring problem. The DTIC algorithm exploits two-hop information to enable high channel reuse among two-hop neighbors and allows for incomplete coloring when the number of colors (or channels) is insufficient to color all vertices without conflict. A distributed message-passing protocol is also proposed to achieve collision-free message exchange, and to ensure that consistent coloring information is shared among WBANs. Simulation results show that our proposed algorithm achieves better co-channel reuse and higher throughput than existing methods.

Controlling sequence length of DS-IR-UWB to enhance performance of multi-WBAN systems

Abstract The international standard of wireless body area networks (WBANs), ie IEEE 802.15.6, was established in Feb. 2012, and this standard decided spreading code as a suppressing interference technology. However, the sequence length of spreading code is fixed, hence it is difficult to guarantee secure communications due to noise and interference from other WBANs. In this paper, we propose utilizing direct sequence impulse radio ultra wideband (DS-IR-UWB) for multi-WBAN systems, and then analyze multi-WBAN systems theoretically, derive equations of inter-WBAN interference, packet error rate (PER) and throughput. Furthermore, to guarantee secure communications, the desired PER is introduced, and then an algorithm is proposed to take the control of sequence length of DS-IR-UWB in order to ensure that the PER of system is always below the desired PER while maximizing the throughput. The numerical evaluation shows that the sequence length of proposed control method is changed according to the SNR and the number of WBANs, it lets the proposed algorithm of control of sequence length outperform the conventional fixed sequence length method.

Random room mobility model and extra‐wireless body area network communication in hospital buildings

Wireless body area networks (WBANs) can help in enabling efficient patient monitoring solution for ubiquitous healthcare. Communication in WBANs is undertaken in two phases: intra-WBAN and extra-WBAN . The prevailing WBANs use cellular network or WiFi in the extra-WBAN phase involving communication between the on-body coordinator and access points (APs) connected to the medical server through the internet. The medical applications of the WBANs have stringent requirements of low end-to-end delay and high packet delivery ratio. The authors evaluate the performance of extra-WBAN communication in the network of WBANs which is deployed within a building environment. They proposed a mobility model named random room mobility ( RRM ), which is used to capture the dynamics of WBAN user mobility within the building. They studied the performance of extra-WBAN communication using the proposed mobility model and a random waypoint mobility model. The metrics used in evaluating the performance are packet drop ratio, average node-to-AP delay and average residual energy per node. The authors show that with an increase in the number of WBANs, the traffic generation rate and the payload size have high impact on the packet loss in the network. They studied the performance of extra-WBAN communication using the priority mode available in IEEE 802.11 for provisioning quality-of-service (QoS). We show that it is suitable for medical applications, when the size of network consisting of WBANs, including the QoS-enabled WBANs, is small.