University of Oulu

I. Ismath, S. Ali, N. Rajatheva and M. Latva-Aho, "Deep Contextual Bandits for Fast Neighbor-Aided Initial Access in mmWave Cell-Free Networks," in IEEE Wireless Communications Letters, vol. 10, no. 12, pp. 2752-2756, Dec. 2021, doi: 10.1109/LWC.2021.3115030

Deep contextual bandits for fast neighbor-aided initial access in mmWave cell-free networks

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Author: Ismath, Insaf1; Ali, Samad1; Rajatheva, Nandana1;
Organizations: 1Center for Wireless Communication, University of Oulu, Oulu, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 1.3 MB)
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Language: English
Published: Institute of Electrical and Electronics Engineers, 2021
Publish Date: 2022-01-26


Access points (APs) in millimeter-wave (mmWave) user-centric (UC) networks will have sleep mode functionality. Initial access (IA) is a challenging problem in UC networks due to the coherent serving of the users. In this letter, a novel deep contextual bandit (DCB) learning-based instantaneous beam selection method is proposed as a complementary tool to current IA schemes. In the proposed approach, the DCB model at an AP uses beam selection information from the neighboring active APs as the input to solve the beam search problem of the host AP. The proposed fast beam selection scheme enables APs to be in energy-saving modes while maintaining the ability to serve users without any delay when restored. Simulations are carried out with realistic channel models generated using a ray-tracing tool. The results show that the proposed system with the 5G IA scheme can respond to dynamic throughput demands with negligible latency compared to the 5G IA scheme without the proposed scheme.

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Series: IEEE wireless communications letters
ISSN: 2162-2337
ISSN-E: 2162-2345
ISSN-L: 2162-2337
Volume: 10
Issue: 12
Pages: 2752 - 2756
DOI: 10.1109/LWC.2021.3115030
Type of Publication: A1 Journal article – refereed
Field of Science: 213 Electronic, automation and communications engineering, electronics
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