期刊
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
卷 68, 期 12, 页码 12066-12078出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TVT.2019.2948761
关键词
Massive MTC; NOMA; short packet communication; energy efficiency; joint subchannel and power allocation
资金
- National Science and Technology Major Project [2018ZX03001029-004]
- National Natural Science Foundation of China [61871045]
- European Unions Horizon2020 research and innovation programme (Clear5G) [761745]
- Engineering and Physical Sciences Research Council (EPSRC) [EP/P03456X/1]
- BUPT Excellent Ph.D.Students Foundation [CX2019308]
- China Scholarship Council
- Beijing Nova Programme on mobile networking
- EPSRC [EP/J017655/1, EP/P03456X/1, EP/N020391/1] Funding Source: UKRI
The 5th-generation (5G) mobile networks and beyond need to support massive machine-type communications (MTC) devices with limited available radio resources. In this paper, we study the power-domain non-orthogonal multiple access (NOMA) technology to support energy-efficient massive MTC networks, where MTC devices exchange information using sporadic and low-rate short packets. We investigate the subchannel allocation and power control policy to maximize the achievable effective energy efficiency (EE) for uplink NOMA-based massive MTC networks, taking into account of short-packet communication characteristics. We model the subchannel allocation problem as a multi-agent Markov decision process and propose an efficient Q-learning algorithm to solve it. Furthermore, we obtain the optimal transmission power policy by approximating the achievable effective rate of uplink NOMA-based short packet communications. Compared with the existing OFDMA scheme, simulations validate that the proposed scheme can improve the achievable effective EE of massive MTC networks with 5.93%.
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