基于情境感知的无线体域网QoS保障机制研究

根据无线体域网的特性和需求，对无线体域网中的QoS保障机制展开研究。具体来说，首先基于对无线体域网数据特征和信道模型的分析和研究，提出自适应的高服务质量MAC协议，该协议具有情境感知和信道感知的功能，即MAC协议利用情境信息和信道历史信息对信道接入进行调整。该协议在传感器节点能量受限的前提下，保证无线体域网中数据的高效可靠传输，在时延、吞吐量和丢包率等QoS要求上都有良好的性能。其次，充分考虑无线体域网从数据采集到数据接收等多个过程，针对无线体域网在能量损耗、吞吐量、时延和丢包率等通信方面的要求，建立多层次的、动态的无线体域网资源分配模型，从而获得最优资源分配方案，保障各项QoS需求，为无线体域网在各领域的广泛应用，提供理论和方法上的支持。

According to the features and requirements of wireless body area network (WBAN), we study the QoS assurance mechanisms in WBAN. Specifically, based on the study of the traffic and channel model in WBAN, we first propose an adaptive MAC protocol with high quality of service (QoS). The proposed protocol with context-aware and channel aware functions could change the channel access approaches based on the context information and channel history. The protocol ensures efficient and reliable data transmission, and high performance of delay, throughput, and packet drop rate under the energy restriction in WBAN. Furthermore, we formulate a multi-scale and dynamic resource allocation model based on the whole process from data acquisition to data reception in WBAN and the requirements of energy, throughput, delay and packet drop rate. We also obtain the optimal resource allocation from the analytical model in order to guarantee the QoS, which laid a theoretical and practical foundation for applications of WBAN.