Throughput assurance of wireless body area networks coexistence based on stochastic geometry

Abstract

Wireless body area networks (WBANs) are expected to influence the traditional medical model by assisting caretakers with health telemonitoring. Within WBANs, the transmit power of the nodes should be as small as possible owing to their limited energy capacity but should be sufficiently large to guarantee the quality of the signal at the receiving nodes. When multiple WBANs coexist in a small area, the communication reliability and overall throughput can be seriously affected due to resource competition and interference. We show that the total network throughput largely depends on the WBANs distribution density (λp), transmit power of their nodes (Pt), and their carrier-sensing threshold (γ). Using stochastic geometry, a joint carrier-sensing threshold and power control strategy is proposed to meet the demand of coexisting WBANs based on the IEEE 802.15.4 standard. Given different network distributions and carrier-sensing thresholds, the proposed strategy derives a minimum transmit power according to varying surrounding environment. We obtain expressions for transmission success probability and throughput adopting this strategy. Using numerical examples, we show that joint carrier-sensing thresholds and transmit power strategy can effectively improve the overall system throughput and reduce interference. Additionally, this paper studies the effects of a guard zone on the throughput using a Matern hard-core point process (HCPP) type II model. Theoretical analysis and simulation results show that the HCPP model can increase the success probability and throughput of networks.

Research on Resource Efficiency Optimization Model of TDMA-Based Distributed Wireless Ad Hoc Networks

“…The type II process can be safely approximated by the corresponding non-homogeneous PPP, whereas the type I process cannot. Reference [23] studies the effects of a guard zone on the throughput of wireless body area networks using a HCPP type II model and [24] proposes a multiuser multiantenna random one-hop cellular network model with the aforementioned minimum distance constraint for adjacent BSs based on HCPP, without considering the effect of the multi-hop interference caused by scope of maintenance. To summarize, most of the existing research based on HCPP model focuses on cellular networks, which scope of maintenance is one hop.…”

A Spectrum Efficient Self-Admission Framework for Coexisting IEEE 802.15.4 Networks under Heterogeneous Traffics

“…In addition, the optimum density of WBANs coexistence is obtained in one frequency channel. In [10], using a HCPP type II model, the authors proposed a joint carrier-sensing threshold and power control strategy to meet the demand of coexisting WBANs based on the IEEE 802.15.4 standard, which improves the overall system throughput and reduces interference in one frequency channel. In [11], the authors used HCPP to develop a novel framework to design spectrumefficient multi-channel random wireless networks based on the IEEE 802.15.4 standard.…”

“…And the collision probability in CSMA process was high, which reduced the system throughout. In [9][10][11], to optimize network performance, the authors used the hard core point process (HCPP) to model the coexisting IEEE 802.15.4based networks. However, the HCPP underestimated the density of coexisting WPANs for the reason that it did not consider the correlation of time and space, and there existed the problem of the strong interference misjudgment between coexisting WPANs.…”

Power Control with Nearest Neighbor Nodes Distribution for Coexisting Wireless Body Area Network Based on Stochastic Geometry

“…It can not only reduce the total energy consumption of the network, but also overcome the main limiting factor of interference. The transmission capacity of the whole networks, moreover, can be improved [27].…”