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arXiv 1901.06339cs.ITmath.IT
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具有公共告警信息的大规模随机接入

Massive Random Access with Common Alarm Messages

Kristoffer Stern, Anders E. Kalør, Beatriz Soret, Petar Popovski

摘要:

关于大规模物联网访问的既定观点是,物联网设备是随机和独立激活的。这是一个基本前提也在最近的信息理论处理大规模访问的Polyanskiy。在许多实际场景中,来自给定地理区域中的IoT设备的信息由于通常观察到的物理现象而固有地相关。我们引入了一个模型,大规模访问,帐户的相关性,在设备激活和消息内容。为此,我们为所有设备引入通用报警消息。物理现象可以触发警报,导致设备的子集同时发送相同的消息。我们开发了一个新的错误概率模型,其中包括假阳性错误,导致解码非传输码字。结果表明,相关允许在牺牲频谱效率的高可靠性。这反映了直观的权衡:只有当设备之间的信息相互关联时,来自大量数据的访问才能超级可靠。

英文摘要:

The established view on massive IoT access is that the IoT devices are activated randomly and independently. This is a basic premise also in the recent information-theoretic treatment of massive access by Polyanskiy. In a number of practical scenarios, the information from IoT devices in a given geographical area is inherently correlated due to a commonly observed physical phenomenon. We introduce a model for massive access that accounts for correlation both in device activation and in the message content. To this end, we introduce common alarm messages for all devices. A physical phenomenon can trigger an alarm causing a subset of devices to transmit the same message at the same time. We develop a new error probability model that includes false positive errors, resulting from decoding a non-transmitted codeword. The results show that the correlation allows for high reliability at the expense of spectral efficiency. This reflects the intuitive trade-off: an access from a massive number can be ultra-reliable only if the information across the devices is correlated.

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