Proxy placement problem for coordinated en-route transcoding proxy caching

Abstract

As audio and video applications have proliferated on the Internet, transcoding proxy caching has been considered as a promising technique for improving network performance, especially for mobile networks. Due to several new emerging factors in the transcoding proxy, existing methods for proxy placement for web caching cannot be directly applied to solve the problem of proxy placement for transcoding proxy caching. In this paper, we address the problem of proxy placement for coordinated en-route transcoding proxy caching given that a fixed number of proxies are allowed. We present a model for this problem by considering the new emerging factors in the transcoding proxy. We formulate this problem as an optimization problem and propose an optimal solution for it using dynamic programming. Our model is evaluated on various performance metrics through extensive simulation experiments and compared with other models proposed in the literature.