Reinforcement Learning for Efficient and Tuning-Free Link Adaptation

• URL: http://arxiv.org/abs/2010.08651v2
• Date: Wed, 5 May 2021 00:44:38 GMT
• Title: Reinforcement Learning for Efficient and Tuning-Free Link Adaptation
• Authors: Vidit Saxena, Hugo Tullberg, and Joakim Jald\'en
• Abstract summary: Wireless links adapt the data transmission parameters to the dynamic channel state -- this is called link adaptation. We propose a latent learning model for link adaptation that exploits the correlation between data transmission parameters. We extend LTS to fading wireless channels through a tuning-free mechanism that automatically tracks the channel dynamics.
• Score: 0.9176056742068812
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Wireless links adapt the data transmission parameters to the dynamic channel state -- this is called link adaptation. Classical link adaptation relies on tuning parameters that are challenging to configure for optimal link performance. Recently, reinforcement learning has been proposed to automate link adaptation, where the transmission parameters are modeled as discrete arms of a multi-armed bandit. In this context, we propose a latent learning model for link adaptation that exploits the correlation between data transmission parameters. Further, motivated by the recent success of Thompson sampling for multi-armed bandit problems, we propose a latent Thompson sampling (LTS) algorithm that quickly learns the optimal parameters for a given channel state. We extend LTS to fading wireless channels through a tuning-free mechanism that automatically tracks the channel dynamics. In numerical evaluations with fading wireless channels, LTS improves the link throughout by up to 100% compared to the state-of-the-art link adaptation algorithms.

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