The increasingly dynamic, unpredictable, and personalized nature of the content that users consume challenges the efficiency of existing caching-based solutions in which only exact content reuse is explored. This calls for novel content delivery schemes that account for the additional gains that can be obtained from the joint compression of correlated content distributed throughout the network, such as updated versions of dynamic data. This chapter reviews state-of-the-art studies on the fundamental limits of cache-aided communication systems for the delivery of correlated content. Two scenarios are considered: (i) a static setting, in which the same correlated content library is used during both the caching and delivery phases and (ii) a dynamic setting, in which an updated version of the content library may become available during the delivery phase.

Chapter Contents:

• Abstract
• 6.1 Introduction
• 6.1.1 Edge caching
• 6.1.2 Turning memory into bandwidth
• 6.1.3 Exploiting content correlations
• 6.2 Delivering correlated content over cache-aided broadcast networks
• 6.2.1 Correlation-aware cache-aided coded multicasting
• 6.2.2 Distortion-memory trade-offs
• 6.3 Caching networks with correlated sources
• 6.3.1 Problem formulation
• 6.3.2 Peak and the average rate-memory functions
• 6.4 Caching networks with correlated sources – the static case
• 6.4.1 Gray-Wyner network
• 6.4.2 Gray-Wyner multiple-request CACM
• 6.4.3 Multiple-request CACM
• 6.4.4 GW-MR for two files and K receivers
• 6.5 Caching networks with correlated sources – the dynamic case
• 6.5.1 Dynamic correlation-aware scheme
• 6.5.2 Greedy group coloring
• 6.6 Illustration results and conclusions
• References

Inspec keywords: video coding; data compression; source coding; cache storage

Other keywords: correlated content library; performance analysis; novel content delivery schemes; exact cache hits; static setting; personalized media dominated services; two-step source coding approach; delivery phase; network compression; correlated video content; dynamic setting; scalable delivery; achievable schemes; joint compression; content pieces; dynamic data; cache-aided broadcast networks; exact content reuse; traditional caching schemes; caching phase; cached information; correlation-unaware cache-aided delivery schemes; cache-aided communication systems

Subjects: File organisation; Video signal processing; Image and video coding