Optimizing MDS Coded Caching in Wireless Networks with Device-to-Device Communication
Journal article, 2018

We consider the caching of content in the mobile devices in a dense wireless network using maximum distance separable (MDS) codes. We focus on an area, served by a base station (BS), where mobile devices move around according to a random mobility model. Users requesting a particular file download coded packets from caching devices within a communication range, using device-to-device communication. If additional packets are required to decode the file, these are downloaded from the BS. We analyze the device mobility and derive a good approximation of the distribution of caching devices within the communication range of mobile devices at any given time. We then optimize the MDS codes to minimize the network load under a cache size constraint and show that using optimized MDS codes results in significantly lower network load compared to when caching the most popular files. We further show numerically that caching coded packets of each file on all mobile devices, i.e., maximal spreading, is optimal.

erasure correcting codes

device-to-device communication

Caching

content delivery

device mobility

Author

Jesper Pedersen

Chalmers, Electrical Engineering, Kommunikationssystem, informationsteori och antenner, Communication Systems

Alexandre Graell i Amat

Chalmers, Electrical Engineering, Kommunikationssystem, informationsteori och antenner, Communication Systems

Iryna Andriyanova

Chalmers, Electrical Engineering, Kommunikationssystem, informationsteori och antenner, Communication Systems

Fredrik Brännström

Chalmers, Electrical Engineering, Kommunikationssystem, informationsteori och antenner, Communication Systems

IEEE Transactions on Wireless Communications

1536-1276 (ISSN)

Rethinking Distributed Storage for Data Storage and Wireless Content Delivery

Swedish Research Council (VR), 2016-01-01 -- 2019-12-31.

Areas of Advance

Information and Communication Technology

Subject Categories

Telecommunications

Communication Systems

More information

Created

10/30/2018