The Performance Analysis of Coded Cache in Wireless Fading Channel

TL;DR

This paper analyzes the performance of coded caching in wireless fading channels, addressing realistic user link quality variations and proposing resource allocation schemes to optimize throughput.

Contribution

It extends coded caching analysis to scenarios with variable link quality and develops resource allocation strategies for improved wireless network performance.

Findings

Throughput decreases as the number of users increases.

Resource allocation can mitigate performance degradation.

Wireless coded caching performance is limited by worst channel conditions.

Abstract

The rapid growth of data volume and the accompanying congestion problems over the wireless networks have been critical issues to content providers. A novel technique, termed as coded cache, is proposed to relieve the burden. Through creating coded-multicasting opportunities, the coded-cache scheme can provide extra performance gain over the conventional push technique that simply pre-stores contents at local caches during the network idle period. But existing works on the coded caching scheme assumed the availability of an error-free shared channel accessible by each user. This paper considers the more realistic scenario where each user may experience different link quality. In this case, the system performance would be restricted by the user with the worst channel condition. And the corresponding resource allocation schemes aimed at breaking this obstacles are developed. Specifically, we employ the coded caching scheme in time division and frequency division transmission mode and formulate the sub-optimal problems. Power and bandwidth are allocated respectively to maximum the system throughput. The simulation results show that the throughput of the technique in wireless scenario will be limited and would decrease as the number of users becomes sufficiently large.