Multi-Beam Power Allocation in Dynamic Massive MIMO Cloud Radio Access Networks

Son Dinh, Hang Liu, Xianfu Chen, Feng Ouyang

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

In this paper, we investigate a cloud radio access network (Cloud-RAN) in which both fronthaul and radio access links use massive MIMO millimeter-wave (mmWave) transmissions. Such an all-mmWave Cloud-RAN architecture provides a flexible and cost-effective means for deployment of next-generation (5G and beyond) cellular networks to meet the demands of fast-growing mobile data traffic. Nevertheless, the design of transmit power allocation schemes for multiple massive MIMO beams on both the fronthaul and access links in a mmWave Cloud-RAN is challenging. In particular, the traffic and wireless channel states of multiple mobile terminals (MTs) change over time, while their statistics may not be known a priori. We formulate the joint fronthaul-access link massive MIMO beam power allocation problem as a Markov decision process (MDP) with an objective to optimize the long-term quality of service to all the MTs in a Cloud-RAN. A reinforcement learning algorithm is designed, which learns the optimal beam power allocation policy on the fly and adapts to the network dynamics. Further, by leveraging the structure of the underlying problem, a post-decision state is introduced and a function decomposition technique is developed to reduce the search space during the learning process. The evaluation results validate the convergence of our proposed scheme and demonstrate its superior performance over the state-of-the-art baselines.
Original languageEnglish
Title of host publicationICC 2021 - IEEE International Conference on Communications
PublisherIEEE Institute of Electrical and Electronic Engineers
ISBN (Electronic)978-1-7281-7122-7
ISBN (Print)978-1-7281-7123-4
DOIs
Publication statusPublished - 2021
MoE publication typeA4 Article in a conference publication
EventIEEE International Conference on Communications Workshops, ICC 2021 - Virtual, Online
Duration: 14 Jun 202123 Jun 2021

Conference

ConferenceIEEE International Conference on Communications Workshops, ICC 2021
CityVirtual, Online
Period14/06/2123/06/21

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