Joint Source-Channel Coding for Semantics-Aware Grant-Free Radio Access in IoT Fog Networks

被引：11

作者：

Dommel, Johannes ^{[1
]}

Utkovski, Zoran ^{[1
]}

Simeone, Osvaldo ^{[2
]}

Stanczak, Slawomir ^{[1
,3
]}

机构：

[1] Fraunhofer Heinrich Hertz Inst, Dept Wireless Commun & Networks, D-10587 Berlin, Germany

[2] Kings Coll London, Dept Engn, CTR, Kings Commun Learning & Informat Proc KCLIP Lab, London WC2R 2LS, England

[3] Tech Univ Berlin, Dept Telecommun Syst, D-10623 Berlin, Germany

来源：

IEEE SIGNAL PROCESSING LETTERS | 2021年 / 28卷

基金：

欧洲研究理事会;

关键词：

Encoding; Sensors; Message passing; Decoding; Wireless sensor networks; Wireless communication; Bayes methods; Approximate message passing; fog-radio access network; random access; type-based multiple access; semantic communications;

D O I：

10.1109/LSP.2021.3072278

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

A fog-radio access network (F-RAN) architecture is studied for an Internet-of-Things (IoT) system in which wireless sensors monitor a number of multi-valued events and transmit in the uplink using grant-free random access to multiple edge nodes (ENs). Each EN is connected to a central processor (CP) via a finite-capacity fronthaul link. In contrast to conventional information-agnostic protocols based on separate source-channel (SSC) coding, where each device uses a separate codebook, this paper considers an information-centric approach based on joint source-channel (JSC) coding via a non-orthogonal generalization of type-based multiple access (TBMA). By leveraging the semantics of the observed signals, all sensors measuring the same event share the same codebook (with non-orthogonal codewords), and all such sensors making the same local estimate of the event transmit the same codeword. The F-RAN architecture directly detects the events' values without first performing individual decoding for each device. Cloud and edge detection schemes based on Bayesian message passing are designed and trade-offs between cloud and edge processing are assessed.

引用

页码：728 / 732

页数：5