Paper Info
Title
Buffer-Aided Relaying in NOMA-Based MTC Networks With Finite Blocklength and Statistical QoS Constraints
Abstract
Machine-type communication (MTC) is one of the main enabling technologies to support various applications with diverse quality of service (QoS) requirements. Finite blocklength transmission has great potential in meeting the strict delay requirements of delay-sensitive MTC devices (MTCDs), while also causing loss of network capacity due to the decoding error probability. Aiming at this problem, we introduce uplink non-orthogonal multiple access (NOMA) and buffer-aided relaying to assist the finite blocklength transmission with delay requirements for improving the achievable effective capacity (EC), which is defined as the maximum short-packet constant arrival rate under specific statistical QoS constraints. To solve the EC maximization problem, we derive the closed-form expression of time allocation coefficient. Then we establish a concave lower bound of EC using successive convex approximation (SCA) for power allocation of MTCDs, and formulate a non-cooperative game based distributed power allocation algorithm for relay. Furthermore, a joint time and power allocation (JTPA) algorithm is proposed to implement joint resource allocation. Simulation results show that under finite blocklength and statistical QoS constraints, adopting buffer-aided relaying can improve EC by 41.82% compared with no-buffer relaying. Moreover, the achievable EC of JTPA algorithm is only 3.12% lower than that of exhaustive search while reducing complexity.
Year
DOI
Venue
2022
10.1109/TWC.2022.3140266
IEEE Transactions on Wireless Communications
Keywords
DocType
Volume
Machine-type communication,non-orthogonal multiple access,buffer-aided relaying,finite blocklength,statistical QoS constraints
Journal
21
Issue
ISSN
Citations 
7
1536-1276
0
PageRank 
References 
Authors
0.34
30
4
Name
Order
Citations
PageRank
Suyu Lv100.34
Xiaodong Xu233648.97
Shujun Han301.01
Ping Zhang422321.33