Tutorial 12022-06-03T18:47:02+00:00

Multi-antenna Coded Caching for Enhanced Wireless Content Delivery

Tuesday, 7 June 2022, 9:00-10:30/11:00-12:30, room A301
  • Antti Tölli (University of Oulu, FI)
  • Seyed Pooya Shariatpanahi (University of Oulu, FI)
  • MohammadJavad Salehi (University of Oulu, FI)

Motivation and Context

The next evolutionary step in human-computer interfaces will bring forward immersive digital experiences that submerge users in a 3D world while allowing them to interact with virtual or twin objects. Accordingly, various collaborative extended reality (XR) applications are expected to emerge, imposing stringent performance requirements on the underlying wireless connectivity infrastructure. In this tutorial, we examine how novel multi-antenna coded caching (CC) techniques can facilitate high-rate low-latency communications and improve users’ quality of experience (QoE) in our envisioned multi-user XR scenario. Specifically, we discuss how these techniques make it possible to prioritize the content relevant to wireless bottleneck areas while enabling the cumulative cache memory of the users to be utilized as an additional communication resource.
In this regard, we first explore recent advancements in multi-antenna CC that facilitate the efficient use of distributed in-device memory resources. Then, we review how XR application requirements are addressed within the third-generation partnership project (3GPP) framework and how our envisioned XR scenario relates to the foreseen use cases. Finally, we identify new challenges arising from integrating CC techniques into multi-user XR scenarios and propose novel solutions to address them in practice.

Structure and Content

Part I – Introduction to the caching paradigm and coded caching (A. Tölli & P. Shariatpanahi)

  • Main caching paradigm;
  • Optimization vs. information theoretic frameworks;
  • Coded caching and its extensions.

Part II – Overview of challenges and proposed solutions for wireless coded caching (P. Shariatpanahi)

  • Overview of wireless coded caching scenarios;
  • Adapting coded caching to wireless content delivery;
  • Effect of channel impairments: fading and path loss;
  • The subpacketization bottleneck.

Part III – Employing multiple antennas for coded caching (A. Tölli)

  • Introduction to multi-antenna coded caching;
  • High-SNR analysis;
  • Low- and Medium-SNR regime;
  • Multicast beamformer design;
  • Complexity issues and solutions.

Part IV – Solving the subpacketization bottleneck (M. Salehi)

  • Single-antenna subpacketization reduction techniques;
  • Multi-antenna subpacketization reduction techniques.

Part V – Practical application scenarios (M. Salehi & A. Tölli)

  • Tackling wireless bottlenecks in immersive digital environments;
  • Intelligent proactive cache placement and network coded multicast delivery mechanisms tailored for location-dependent multimedia content.
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