用于IEEE 802.15.4 DSME以支持IoT系统中的波动业务的新PDKEEPAAA减少机制
New CAP Reduction Mechanisms for IEEE 802.15.4 DSME to Support Fluctuating Traffic in IoT Systems
摘要：
2015年，IEEE 802.15.4标准通过确定性和同步多通道扩展（DSME）进行了扩展，以提高工业应用的可靠性，可扩展性和能效。该扩展提供了基于TDMA/FDMA的信道接入，其中时间被划分为两个交替的阶段，竞争接入期（CAP）和无竞争期（CFP）。在CAP期间，可以分配传输时隙，以在CFP期间提供对共享介质的独占访问。CFP的时隙在帧中的分数$τ$是一个关键值，因为它直接影响灵活性和吞吐量。高吞吐量要求CFP比CAP长得多，即，分数$τ$的高值，因为应用数据仅在CFP期间发送。如果发送CAP消息的预期等待时间短并且CAP的长度足够长以适应GTS的必要（解）分配，即，分数$τ$的低值。一旦根据应用的需要配置了DSME，分数$τ$就只能取两个值中的一个，并且不能在运行时改变。在本文中，我们提出了两个扩展的DSME，允许采用$τ$，以目前的交通模式。我们从理论上和通过模拟表明，建议的扩展提供了高度的响应流量波动，同时保持高吞吐量。
英文摘要：
In 2015, the IEEE 802.15.4 standard was expanded by the Deterministic and Synchronous Multi-Channel Extension (DSME) to increase reliability, scalability and energy-efficiency in industrial applications. The extension offers a TDMA/FDMA-based channel access, where time is divided into two alternating phases, a contention access period (CAP) and a contention free period (CFP). During the CAP, transmission slots can be allocated offering an exclusive access to the shared medium during the CFP. The fraction $τ$ of CFP's time slots in a dataframe is a critical value, because it directly influences agility and throughput. A high throughput demands that the CFP is much longer than the CAP, i.e., a high value of the fraction $τ$, because application data is only sent during the CFP. High agility is given if the expected waiting time to send a CAP message is short and that the length of the CAPs are sufficiently long to accommodate necessary (de)allocations of GTSs, i.e., a low value of the fraction $τ$. Once DSME is configured according to the needs of an application, the fraction $τ$ can only assume one of two values and cannot be changed at run-time. In this paper, we propose two extensions of DSME that allow to adopt $τ$ to the current traffic pattern. We show theoretically and through simulations that the proposed extensions provide a high degree of responsiveness to traffic fluctuations while keeping the throughput high.
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