Distributed and Adaptive Medium Access Control for Internet-of-Things-Enabled Mobile Networks
Distributed and Adaptive Medium Access Control for Internet-of-Things-Enabled Mobile Networks
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DOI：
10.1109/jiot.2016.2566659
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发表时间：
2017-04-01
影响因子：
10.6
通讯作者：
Zhuang, Weihua
中科院分区：
文献类型：
--
作者：
Ye, Qiang;Zhuang, Weihua
针对支持语音和数据业务的单跳物联网(IoT)移动自组网，提出了一种分布式自适应混合介质访问控制(DAH-MAC)方案。混合超帧结构被设计为适应来自不同数量的移动节点的分组传输，所述移动节点产生延迟敏感的语音业务或尽力而为的数据业务。在每个超帧内，具有发送分组的语音节点使用分布式时分多址在无争用时段(CFP)中接入信道，而数据节点使用截断载波侦听具有冲突避免的多址接入在争用时段(CP)中竞争信道接入。在CFP中，MAC根据瞬时话音业务负载自适应地分配时隙，利用话音业务复用来增加话音容量。在CP中，针对DAH-MAC提出了一种吞吐量优化框架，该框架通过根据语音和数据业务负载的变化调整最优竞争窗口大小来最大化总数据吞吐量。数值结果表明，对于存在异质业务负载动态的语音和数据业务，所提出的MAC方案优于现有的服务质量感知的MAC方案。
In this paper, we propose a distributed and adaptive hybrid medium access control (DAH-MAC) scheme for a singlehop Internet of Things (IoT)-enabled mobile ad hoc network supporting voice and data services. A hybrid superframe structure is designed to accommodate packet transmissions from a varying number of mobile nodes generating either delay-sensitive voice traffic or best-effort data traffic. Within each superframe, voice nodes with packets to transmit access the channel in a contention-free period (CFP) using distributed time division multiple access, while data nodes contend for channel access in a contention period (CP) using truncated carrier sense multiple access with collision avoidance. In the CFP, by adaptively allocating time slots according to instantaneous voice traffic load, the MAC exploits voice traffic multiplexing to increase the voice capacity. In the CP, a throughput optimization framework is proposed for the DAH-MAC, which maximizes the aggregate data throughput by adjusting the optimal contention window size according to voice and data traffic load variations. Numerical results show that the proposed MAC scheme outperforms existing quality-of-service-aware MAC schemes for voice and data traffic in the presence of heterogeneous traffic load dynamics.