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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Vydáno v:	IEEE transactions on communications Ročník 67; číslo 7; s. 5053 - 5068
Hlavní autoři:	Zhao, Xiaoyu, Chen, Wei
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	New York IEEE 01.07.2019 The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Témata:	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
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Abstract	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.
AbstractList	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.
Author	Chen, Wei Zhao, Xiaoyu
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SubjectTerms	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)
Title	Non-Orthogonal Multiple Access for Delay-Sensitive Communications: A Cross-Layer Approach
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