Guaranteed Time Slot Allocation for IEEE 802.15.4-Based Wireless Feedback Control Systems
Guaranteed Time Slot Allocation for IEEE 802.15.4-Based Wireless Feedback Control Systems
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DOI：
10.1109/access.2019.2951597
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发表时间：
2019
期刊：
影响因子：
3.9
通讯作者：
Kentaro Kobayashi;Hiraku Okada;M. Katayama
中科院分区：
文献类型：
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作者：
Kentaro Kobayashi;Hiraku Okada;M. Katayama
本文研究了IEEE 802.15.4信标网络中多台机器的无线反馈控制问题。在支持信标的IEEE 802.15.4网络中，信标在时间轴上周期性地构造超帧，每个超帧由竞争接入周期(CAP)和无竞争周期(CFP)组成。在CAP中，使用载波侦听多址/冲突避免(CSMA/CA)；在CFP中，使用基于保证时隙(GTS)的时分多址。由于分组传输的冲突和退避周期，CAP中的通信失败概率大于CFP中的通信失败概率；然而，标准将可用GTS的数量限制为七个。为了提高无线反馈控制的控制性能，控制器必须有效地分配GTS来传输控制输入和被控机器的状态反馈。为了更好地分配GTS，我们提供了一种简单而有效的思想，它同时考虑了CAP和CFP的反馈控制机制和分组传输机制。我们提出了一种完全符合IEEE 802.15.4标准的优越的GTS分配方法，并证明了该方法可以进一步提高控制性能。
In this paper, wireless feedback control of multiple machines over a beacon-enabled IEEE 802.15.4 network is considered. In the beacon-enabled IEEE 802.15.4 network, beacons periodically structure superframes on the time axis, and each superframe consists of a contention access period (CAP) and a contention free period (CFP). In the CAP, a carrier sense multiple access/collision avoidance (CSMA/CA) is used; in the CFP, a guaranteed time slot (GTS)-based time division multiple access is used. Because of collision and backoff periods of packet transmission, the probability of communication failure in the CAP is greater than that in the CFP; however, the number of available GTSs is limited to seven by the standard. In order to improve the control performance of wireless feedback control, the controller must effectively allocate GTSs to transmit control input and state feedback of controlled machines. We provide a simple but efficient idea that takes both the feedback control mechanism and packet transmission mechanism of the CAP and CFP into consideration to better allocate GTSs. We propose a superior GTS allocation method that fully conforms to the IEEE 802.15.4 standard and show that the proposed method can further improve control performance.