Cooperative Edge Caching in User-Centric Clustered Mobile Networks

10/24/2017
by   Shan Zhang, et al.
0

With files proactively stored at base stations (BSs), mobile edge caching enables direct content delivery without remote file fetching, which can reduce the end-to-end delay while relieving backhaul pressure. To effectively utilize the limited cache size in practice, cooperative caching can be leveraged to exploit caching diversity, by allowing users served by multiple base stations under the emerging user-centric network architecture. This paper explores delay-optimal cooperative edge caching in large-scale user-centric mobile networks, where the content placement and cluster size are optimized based on the stochastic information of network topology, traffic distribution, channel quality, and file popularity. Specifically, a greedy content placement algorithm is proposed based on the optimal bandwidth allocation, which can achieve (1-1/e)-optimality with linear computational complexity. In addition, the optimal user-centric cluster size is studied, and a condition constraining the maximal cluster size is presented in explicit form, which reflects the tradeoff between caching diversity and spectrum efficiency. Extensive simulations are conducted for analysis validation and performance evaluation. Numerical results demonstrate that the proposed greedy content placement algorithm can reduce the average file transmission delay up to 50 with the non-cooperative and hit-ratio-maximal schemes. Furthermore, the optimal clustering is also discussed considering the influences of different system parameters.

READ FULL TEXT
research
03/10/2018

Energy and Delay Optimization for Cache-Enabled Dense Small Cell Networks

Caching popular files in small base stations (SBSs) has been proved to b...
research
01/10/2018

When Exploiting Individual User Preference Is Beneficial for Caching at Base Stations?

Most of prior works optimize caching policies based on the following ass...
research
04/15/2019

A Personalized Preference Learning Framework for Caching in Mobile Networks

This paper comprehensively studies a content-centric mobile network base...
research
04/20/2018

On the Effects of Subpacketization in Content-Centric Mobile Networks

A large-scale content-centric mobile ad hoc network employing subpacketi...
research
08/07/2020

An Analytical Framework for Delay Optimal Mobile Edge Deployment in Wireless Networks

The emerging edge caching provides an effective way to reduce service de...
research
01/28/2021

Joint Transmission Scheme and Coded Content Placement in Cluster-centric UAV-aided Cellular Networks

Recently, as a consequence of the COVID-19 pandemic, dependence on telec...
research
01/28/2022

Random Caching Design for Multi-User Multi-Antenna HetNets with Interference Nulling

The strong interference suffered by users can be a severe problem in cac...

Please sign up or login with your details

Forgot password? Click here to reset