Cache-Assisted Broadcast-Relay Wireless Networks: A Delivery-Time Cache-Memory Tradeoff
Jaber Kakar, Alaa Alameer, Anas Chaaban, Aydin Sezgin and, Arogyaswami Paulraj

TL;DR
This paper investigates the fundamental latency limits of cache-assisted broadcast-relay wireless networks, proposing new schemes that optimize delivery time by exploiting caching and interference management, and characterizing the cache-latency tradeoff.
Contribution
It introduces novel cache placement and delivery schemes, including a one-shot approach and beamforming strategies, to optimize normalized delivery time in wireless networks with caches.
Findings
The one-shot scheme achieves NDT gains from caching and zero-forcing.
The second scheme uses beamforming for interference alignment at low cache sizes.
The optimal cache-latency tradeoff is characterized for systems with K+M ≤ 4.
Abstract
An emerging trend of next generation communication systems is to provide network edges with additional capabilities such as storage resources in the form of caches to reduce file delivery latency. To investigate this aspect, we study the fundamental limits of a cache-aided broadcast-relay wireless network consisting of one central base station, cache-equipped transceivers and receivers from a latency-centric perspective. We use the normalized delivery time (NDT) to capture the per-bit latency for the worst-case file request pattern, normalized with respect to a reference interference-free system with unlimited transceiver cache capabilities. The objective is to design the schemes for cache placement and file delivery in order to minimize the NDT. To this end, we establish a novel converse and two types of achievability schemes applicable to both time-variant and invariant…
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