Multi-access coded caching: gains beyond cache-redundancy

Serbetci, Berksan; Parrinello, Emanuele; Elia, Petros
ITW 2019, IEEE Information Theory Workshop, 25-28 August, 2019, Visby, Gotland, Sweden

The work considers the K-user cache-aided shared-link broadcast channel where each user has access to exactly z caches of normalized size, and where each cache assists exactly
z users. For this setting, for two opposing memory regimes, we propose novel caching and coded delivery schemes which maximize the local caching gain, and achieve a coding gain larger than 1+K (users served at a time) despite the fact that the total cache redundancy remains K irrespective of z. Interestingly, when z = K−1 K  , the derived optimal coding gain is K z + 1, matching the performance of a hypothetical scenario where each user has its own dedicated cache of size z.

DOI
Type:
Conférence
City:
Visby
Date:
2019-08-24
Department:
Systèmes de Communication
Eurecom Ref:
5952
Copyright:
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