On the coded caching based wireless video transmission scheme

Abstract

Recently, the video traffic over wireless network has been growing dramatically, which causes network congestion during peak hours. Coded caching has been considered as a promising technique to release this burden by providing local caching gain and global caching gain simultaneously. A placement delivery array (PDA) design was formulated to characterize the centralized coded caching schemes. In this paper, the PDA based coded caching design is employed in two aspects. Firstly, we utilize it to characterize the users' priority level. An algorithm to generate a PDA to take users' priority level into consideration is proposed. Secondly, we implement it for wireless video-streaming over wireless network by incorporating rateless codes into it. Further, we establish a test-bed to validate the aforementioned idea. Our results indicate that, the video transmission capability can be significantly improved by exploiting the coded multicasting opportunities created by coded caching scheme, and the effective packet loss recovery can be guaranteed by the rateless transmission. Meanwhile, it is shown that the PDA based coded caching video transmission scheme can be easily modified to support different users' priority level.