Non-Orthogonal Multiple Access for Delay-Sensitive Communications: A Cross-Layer Approach

Non-orthogonal multiple access (NOMA) has attracted great attention in the fifth-generation (5G) system to meet the rapidly increasing demand on quality of service (QoS). Among various QoS requirements, the urgent latency requirement has been expected to be provided for the delay-sensitive applicati...

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Bibliographic Details
Published in:IEEE transactions on communications Vol. 67; no. 7; pp. 5053 - 5068
Main Authors: Zhao, Xiaoyu, Chen, Wei
Format: Journal Article
Language:English
Published: New York IEEE 01.07.2019
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Algorithms
Coding
constrained Markov decision process (CMDP)
Constraints
cross-layer design
Delay
delay-sensitive communications
Delays
Design optimization
Encoding
Fading channels
Linear programming
Markov analysis
Markov processes
NOMA
Non-orthogonal multiple access (NOMA)
Nonorthogonal multiple access
optimal delay-power tradeoff
Physical layer
Power management
Quality of service
quality of service (QoS)
Queues
Reliability
Scheduling
Superposition (mathematics)
ISSN:0090-6778, 1558-0857
Online Access:Get full text
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Summary:Non-orthogonal multiple access (NOMA) has attracted great attention in the fifth-generation (5G) system to meet the rapidly increasing demand on quality of service (QoS). Among various QoS requirements, the urgent latency requirement has been expected to be provided for the delay-sensitive applications. In this paper, the delay-optimal uplink transmission in NOMA is studied over a block fading channel based on a cross-layer design, by which average latency is minimized with reliability provided by power allocation. In particular, the superposition coding in the physical layer and the scheduling in the network layer are jointly determined by the joint probabilities on the decisions of coding orders and transmission rates with the aware channel and queue states. With a constrained Markov decision process (CMDP), the cross-layer optimization is formulated to minimize the average delay subject to the constraints on power and reliability. The optimal delay-power tradeoff is obtained by formulating an equivalent linear programming (LP), which can be presented for multiple users based on a unified algorithm. Moreover, the optimal joint scheduling and superposition coding (JSSC) policy is constructed by using the structural properties. Based on the optimal cross-layer design, the transmission latency is optimized in the practical NOMA system.
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ISSN:0090-6778
1558-0857
DOI:10.1109/TCOMM.2019.2904577