Feedback-Aided Coded Caching for the MISO BC with Small Caches

Abstract

This work explores coded caching in the symmetric $K$-user cache-aided MISO BC with imperfect CSIT-type feedback, for the specific case where the cache size is much smaller than the library size. Building on the recently explored synergy between caching and delayed-CSIT, and building on the tradeoff between caching and CSIT quality, the work proposes new schemes that boost the impact of small caches, focusing on the case where the cumulative cache size is smaller than the library size. For this small-cache setting, based on the proposed near-optimal schemes, the work identifies the optimal cache-aided degrees-of-freedom (DoF) performance within a factor of 4.

8 pages, 1 figure. arXiv admin note: substantial text overlap with arXiv:1511.03961

References in corpus (11)

• Caching at the Edge: a Green Perspective for 5G Networks
• Fundamental Limits of Caching: Improved Bounds For Small Buffer Users
• Degrees-of-Freedom Region of the MISO Broadcast Channel with General Mixed-CSIT
• Effect of Number of Users in Multi-level Coded Caching
• Information-Theoretic Caching: Sequential Coding for Computing
• Critical Database Size for Effective Caching
• On the Degrees of Freedom of the K-User Time Correlated Broadcast Channel with Delayed CSIT
• Imperfect and Unmatched CSIT is Still Useful for the Frequency Correlated MISO Broadcast Channel
• Cache-Enabled Broadcast Packet Erasure Channels with State Feedback
• The Synergistic Gains of Coded Caching and Delayed Feedback
• On the Fundamental Feedback-vs-Performance Tradeoff over the MISO-BC with Imperfect and Delayed CSIT