Retrial Queueing System for Analyzing Impact of Priority Ultra-Reliable Low-Latency Communication Transmission on Enhanced Mobile Broadband Quality of Service Degradation in 5G Networks

Fifth generation (5G) networks support ultra-reliable low-latency communications (URLLC) and enhanced mobile broadband (eMBB). The coexistence of URLLC and eMBB is often organized by non-orthogonal multiple access (NOMA), giving priority to URLLC and resulting in eMBB quality of service (QoS) degrad...

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Bibliographic Details
Published inMathematics (Basel) Vol. 11; no. 18; p. 3925
Main Authors Makeeva, Elena, Kochetkova, Irina, Alkanhel, Reem
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.09.2023
Subjects
5G mobile communication
admission control
Analysis
Broadband
Buffers
Communications industry
Data transmission
Degradation
eMBB
Food science
Impact analysis
interruption
joint transmission
Mobile computing
Network latency
Nonorthogonal multiple access
Numerical analysis
Quality of service
Quality of service architectures
Queuing theory
Telecommunications services industry
URLLC
Wireless networks
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Summary:Fifth generation (5G) networks support ultra-reliable low-latency communications (URLLC) and enhanced mobile broadband (eMBB). The coexistence of URLLC and eMBB is often organized by non-orthogonal multiple access (NOMA), giving priority to URLLC and resulting in eMBB quality of service (QoS) degradation. In this paper, we address the issue of joint URLLC and eMBB transmission, focusing on the problem from the perspective of delay-tolerant eMBB. Due to the priority given to URLLC, we assume that an eMBB session may be interrupted if there are no free resources available for URLLC or delayed when a new eMBB session arrives. To make the scheme more flexible, we propose that interrupted and delayed eMBB sessions periodically check for free resources, rather than continuously. To analyze this scenario, we propose a retrial queuing system with two retrial buffers (orbits) for interrupted and delayed eMBB sessions. The stationary probability distribution, provided in matrix form by recursive formulas, is presented. The paper concludes with a numerical example showing that the scheme with two buffers, compared to one buffer, practically doubles the average number of active eMBB sessions while keeping the interruption probability below 0.001. We provide an illustration of the configuration of eMBB retrial rates to meet its QoS requirements.
ISSN:2227-7390
2227-7390
DOI:10.3390/math11183925