Cache-Enabled Opportunistic Cooperative MIMO for Video Streaming in Wireless Systems

TL;DR

This paper introduces a cache-enabled cooperative MIMO framework for wireless video streaming, optimizing power and cache control to enhance spatial multiplexing and QoS without heavy backhaul use.

Contribution

It proposes a novel MDS-coded cache scheme and a two-timescale joint optimization method for power and cache control in cooperative MIMO systems.

Findings

Achieves higher spatial multiplexing gains in video streaming.

Optimizes power and cache control adaptively for QoS.

Demonstrates superior performance over baseline methods.

Abstract

We propose a cache-enabled opportunistic cooperative MIMO (CoMP) framework for wireless video streaming. By caching a portion of the video files at the relays (RS) using a novel MDS-coded random cache scheme, the base station (BS) and RSs opportunistically employ CoMP to achieve spatial multiplexing gain without expensive payload backhaul. We study a two timescale joint optimization of power and cache control to support real-time video streaming. The cache control is to create more CoMP opportunities and is adaptive to the long-term popularity of the video files. The power control is to guarantee the QoS requirements and is adaptive to the channel state information (CSI), the cache state at the RS and the queue state information (QSI) at the users. The joint problem is decomposed into an inner power control problem and an outer cache control problem. We first derive a closed-form power control policy from an approximated Bellman equation. Based on this, we transform the outer problem into a convex stochastic optimization problem and propose a stochastic subgradient algorithm to solve it. Finally, the proposed solution is shown to be asymptotically optimal for high SNR and small timeslot duration. Its superior performance over various baselines is verified by simulations.