Mixed-Timescale Precoding and Cache Control in Cached MIMO Interference Network
An Liu, Vincent Lau

TL;DR
This paper introduces a mixed-timescale optimization framework for cache-enabled MIMO interference networks, leveraging opportunistic CoMP and adaptive cache control to reduce transmit power while satisfying media streaming rate requirements.
Contribution
It proposes a novel joint stochastic optimization approach for MIMO precoding and cache control that enhances interference mitigation without needing media popularity knowledge.
Findings
Significant power reduction compared to baselines
Effective interference mitigation via cache-induced CoMP
Robust low-complexity solution with convergence guarantees
Abstract
Consider media streaming in MIMO interference networks whereby multiple base stations (BS) simultaneously deliver media to their associated users using fixed data rates. The performance is fundamentally limited by the cross-link interference. We propose a cache-induced opportunistic cooperative MIMO (CoMP) for interference mitigation. By caching a portion of the media files, the BSs opportunistically employ CoMP to transform the cross-link interference into spatial multiplexing gain. We study a mixed-timescale optimization of MIMO precoding and cache control to minimize the transmit power under the rate constraint. The cache control is to create more CoMP opportunities and is adaptive to the long-term popularity of the media files. The precoding is to guarantee the rate requirement and is adaptive to the channel state information and cache state at the BSs. The joint stochastic…
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