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首页> 外文期刊>Proceedings of the IEEE >Toward Massive, Ultrareliable, and Low-Latency Wireless Communication With Short Packets
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Toward Massive, Ultrareliable, and Low-Latency Wireless Communication With Short Packets

机译：使用短数据包实现大规模，超可靠和低延迟的无线通信

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摘要

Most of the recent advances in the design of high-speed wireless systems are based on information-theoretic principles that demonstrate how to efficiently transmit long data packets. However, the upcoming wireless systems, notably the fifth-generation (5G) system, will need to support novel traffic types that use short packets. For example, short packets represent the most common form of traffic generated by sensors and other devices involved in machine-to-machine (M2M) communications. Furthermore, there are emerging applications in which small packets are expected to carry critical information that should be received with low latency and ultrahigh reliability. Current wireless systems are not designed to support short-packet transmissions. For example, the design of current systems relies on the assumption that the metadata (control information) is of negligible size compared to the actual information payload. Hence, transmitting metadata using heuristic methods does not affect the overall system performance. However, when the packets are short, metadata may be of the same size as the payload, and the conventional methods to transmit it may be highly suboptimal. In this paper, we review recent advances in information theory, which provide the theoretical principles that govern the transmission of short packets. We then apply these principles to three exemplary scenarios (the two-way channel, the downlink broadcast channel, and the uplink random access channel), thereby illustrating how the transmission of control information can be optimized when the packets are short. The insights brought by these examples suggest that new principles are needed for the design of wireless protocols supporting short packets. These principles will have a direct impact on the system design.
机译：高速无线系统设计中的大多数最新进展都基于信息理论原理，该原理说明了如何有效地传输长数据包。但是，即将到来的无线系统，特别是第五代（5G）系统，将需要支持使用短数据包的新型流量类型。例如，短数据包代表由传感器和涉及机器对机器（M2M）通信的其他设备生成的流量的最常见形式。此外，在新兴的应用中，期望小数据包携带应以低等待时间和超高可靠性接收的关键信息。当前的无线系统不被设计为支持短分组传输。例如，当前系统的设计依赖于这样的假设：与实际信息有效载荷相比，元数据（控制信息）的大小可以忽略。因此，使用启发式方法传输元数据不会影响整体系统性能。然而，当分组短时，元数据可以与有效载荷具有相同的大小，并且传输它的常规方法可能是次优的。在本文中，我们回顾了信息理论的最新进展，这些进展提供了控制短数据包传输的理论原理。然后，我们将这些原理应用于三个示例性场景（双向信道，下行链路广播信道和上行链路随机接入信道），从而说明了当数据包较短时如何优化控制信息的传输。这些示例带来的见解表明，设计支持短数据包的无线协议需要新的原理。这些原则将直接影响系统设计。

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