Outage of Periodic Downlink Wireless Networks With Hard Deadlines
Outage of Periodic Downlink Wireless Networks With Hard Deadlines
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DOI：
10.1109/tcomm.2018.2879934
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发表时间：
2018-06
影响因子：
8.3
通讯作者：
Rebal Jurdi;Saeed R. Khosravirad;H. Viswanathan;J. Andrews;R. Heath
中科院分区：
文献类型：
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作者：
Rebal Jurdi;Saeed R. Khosravirad;H. Viswanathan;J. Andrews;R. Heath
我们考虑下行链路周期性无线通信系统，其中多个接入点协作地将分组发送到多个设备，例如，工业控制系统中的执行器。每个周期由两个阶段组成：上行链路训练阶段和下行链路数据传输阶段。每个执行器必须在单个传输阶段内成功接收其唯一的数据包;否则，将宣布中断。这种中断可能由两个事件引起：由于以信道实际上不能支持的速率传输而导致的传输错误，或者时间溢出，其中下行链路数据相位太短，给定信道条件以成功地传送所有分组。我们确定的时间溢出概率的封闭形式的表达式时，只有两个现场设备，以及任意数量的设备的传输错误概率。此外，我们提供的时间溢出概率的上限和下限为任意数量的设备。我们提出了一种新的可变速率传输方法，消除了时间溢出。详细的系统级仿真被用来确定系统设计准则，如最佳的训练时间，以及基准测试所提出的系统设计与非合作蜂窝，合作固定速率，和合作中继。
We consider a downlink periodic wireless communications system, where multiple access points cooperatively transmit packets to a number of devices, e.g., actuators in an industrial control system. Each period consists of two phases: an uplink training phase and a downlink data transmission phase. Each actuator must successfully receive its unique packet within a single transmission phase; else, an outage is declared. Such an outage can be caused by two events: a transmission error due to transmission at a rate that the channel cannot actually support or time overflow, where the downlink data phase is too short, given the channel conditions to successfully communicate all the packets. We determine the closed-form expressions for the time overflow probability when there are just two field devices, as well as the transmission error probability for an arbitrary number of devices. In addition, we provide upper and lower bounds on the time overflow probability for an arbitrary number of devices. We propose a novel variable-rate transmission method that eliminates time overflow. Detailed system-level simulations are used to identify system design guidelines, such as the optimal amount of training time, as well as for benchmarking the proposed system design versus non-cooperative cellular, cooperative fixed-rate, and cooperative relaying.