Massive multiple access schemes, capable of serving a large number uncoordinated devices while fulfilling reliability and latency constraints, are proposed. The schemes belong to the class grant-free coded random protocols tailored massive input output (MIMO) base station processing. High is obtained owing an intra-frame spatial coupling effect, triggered by simple device protocol combined with...

The optimal design of the energy-efficient multiple-input multiple-output (MIMO) aided uplink ultra-reliable low-latency communications (URLLC) system is an important but unsolved problem. For such a system, we propose novel absorbing-Markov-chain-based analysis framework to shed light on puzzling relationship between delay and reliability, as well quantify energy efficiency. We derive transiti...

This paper deals with the reliability of random access (RA) protocols for massive wireless smart grid communication (m-SGC). We propose and analyze an improved grant-free RA (GF-RA) protocol critical SG applications under strict QoS m-SGC requirements. At first, we discuss main features neighborhood area network (NAN) architecture. explore low-rate machine-type networks, also describe a technol...