Impact of CSI Feedback Strategies on LTE Downlink and Reinforcement Learning Solutions for Optimal Allocation
Abstract: The constant increase in wireless handheld devices and the prospect of billions of connected machines has led the cellular community to research many different technologies that can deliver a high data rate and quality of service to mobile users (MUs). One of the problems that is usually overlooked by the community is that more devices mean higher signaling necessary to coordinate transmission and to allocate resources effectively. In particular, channel state information (CSI) of the users' channels is nec necessary essary in order for the base station to assign frequency resources. On the other hand, this feedback (FB) information comes at a cost of uplink (UL) bandwidth, which is traditionally not considered. In this paper, we analyze the impact that reduced user FB information has on a LongLong Term Evolution (LTE) network. A model, which considers the tradeoff between downlink (DL) performance and UL overhead, is presented. We introduce different FB-allocation allocation strategies, which follow the same structure as the ones in the LTE standard, and study their effects on the network for varying number of users and different resource resource-allocation allocation strategies. We show that dynamically allocating FB resources can be beneficial for the network. In order for the base station to determinee which FB FB-allocation allocation strategy is the most beneficial, in specific network conditions, we propose two reinforcement learning (RL) algorithms. The first solution allows the base station to allocate one