Medium Access for Concurrent Traffic in Wireless Body Area Networks: Protocol Design and Analysis
Abstract: Wireless body area networks have been deployed to monitor the health condition of patients. In these applications, multiple sensors are required to report realtime data to the sink such that a physician can diagnose accurately, particularly for intensive care patients, which boosts the convergecast traffic load and increases the collision probability. However, the existing protocols cannot effectively vely operate under such concurrent traffic load. To bridge this gap, we present a novel two-phase phase receiver-initiated receiver initiated medium access control (MAC) protocol for concurrent traffic based on asynchronous duty cycling, which is called C-MAC. Technically, C-MAC MAC in in the first phase employs carrier carrier-sense multiple access with collision avoidance of the IEEE 802.15.6 standard and designs an ordering-based based communication algorithm to effectively avoid collisions. Moreover, C-MAC MAC enables sensor nodes to switch to standby mode to avoid idle listening and overhearing in the second phase. Furthermore, theoretically, we explicitly formulate the mathematical expressions of the random delay and energy consumption of C C-MAC. MAC. Finally, we conduct extensive numerical analysis and simulation ulation to demonstrate the correctness of theoretical results and the better effectiveness and efficiency of C-MAC C than that of RI-MAC MAC and A A-MAC in terms of transmission delay and energy consumption.