Ultra-Reliable Low-Latency Communications
Foundations and Trends in Communications and Information Theory(2023)
摘要
Wireless communication has traditionally been designed to
connect human users. The main design goal was to maximize
the data rate while guaranteeing moderate reliability
and latency targets dictated by the limitations of human
senses. The application of wireless connectivity for machine
to machine communications, typically known as machinetype
communications (MTC), has been growing in the past
decade due to its flexibility, scalability and ease of use. It is
also driven by the proliferation of Internet of Things (IoT)
nodes and applications, with several billions of connected
devices expected by the next decade. The fifth-generation (5G) New Radio (NR) wireless system
has introduced two distinct services classes to support
MTC, namely massive machine-type communications
(mMTC) and the ultra-reliable low-latency communications
(URLLC). Out of these, designing URLLC solutions is the
most challenging given that it aims to provide dependable
connectivity for mission-critical applications in industrial
scenarios, process engineering and other similar verticals. URLLC aims to guarantee very high reliability and very low
latency, and therefore the outage performance replaces the
average performance as the main design criterion. This calls
for a new approach to the communication- and information-theoretic
fundamentals of wireless system design. Different
theoretic foundations of URLLC have so far been treated
in individual and disconnected works that fail to provide
a meta-level understanding of this topic. This monograph
aims at filling this gap by presenting a comprehensive coverage
of the topic including the motivation, theory, practical
enablers and future evolution. The unified level of details in
this monograph is aimed at providing a balanced coverage
between its fundamental communication- and information-theoretic
background and its practical enablers, including
5G NR system design aspects. Finally, this monograph offers
an outlook on URLLC evolution in the sixth-generation (6G)
era towards dependable and resilient wireless communications.
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