Son Sunghwa, Park Kyung-Joon, Park Eun-Chan
Department of Information and Communication Engineering, DGIST, Daegu, Korea.
Department of Information and Communication Engineering, Dongguk University, Seoul, Korea.
PLoS One. 2016 Aug 4;11(8):e0160052. doi: 10.1371/journal.pone.0160052. eCollection 2016.
In this paper, we deal with the problem of assuring medical-grade quality of service (QoS) for real-time medical applications in wireless healthcare systems based on IEEE 802.11e. Firstly, we show that the differentiated channel access of IEEE 802.11e cannot effectively assure medical-grade QoS because of priority inversion. To resolve this problem, we propose an efficient channel access algorithm. The proposed algorithm adjusts arbitrary inter-frame space (AIFS) in the IEEE 802.11e protocol depending on the QoS measurement of medical traffic, to provide differentiated near-absolute priority for medical traffic. In addition, based on rigorous capacity analysis, we propose an admission control scheme that can avoid performance degradation due to network overload. Via extensive simulations, we show that the proposed mechanism strictly assures the medical-grade QoS and improves the throughput of low-priority traffic by more than several times compared to the conventional IEEE 802.11e.
在本文中，我们探讨了基于IEEE 802.11e的无线医疗系统中，为实时医疗应用确保医疗级服务质量（QoS）的问题。首先，我们表明，由于优先级反转，IEEE 802.11e的差异化信道接入无法有效地确保医疗级QoS。为了解决这个问题，我们提出了一种高效的信道接入算法。该算法根据医疗流量的QoS测量值，调整IEEE 802.11e协议中的任意帧间间隔（AIFS），为医疗流量提供差异化的近绝对优先级。此外，基于严格的容量分析，我们提出了一种准入控制方案，该方案可以避免由于网络过载导致的性能下降。通过广泛的仿真，我们表明，与传统的IEEE 802.11e相比，所提出的机制严格确保了医疗级QoS，并将低优先级流量的吞吐量提高了数倍以上。
