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Caching decreases content access time by keeping contents closer to the clients. In this paper we show that network coding chunks of different contents and storing them in cache, can be beneficial. Recent research considers caching network coded chunks of same content, but not different contents. This paper proposes three different methods, IP, layered-IP and Greedy algorithm, with different performance...
We consider a network consisting of a file server connected through a shared link to a number of users, each equipped with a cache. Knowing the popularity distribution of the files in the database, the goal is to optimally populate the caches such as to minimize the expected load of the shared link. For a single user, it is well known that caching the most popular files is optimal in this setting...
Layered coding elegantly handles user bandwidth heterogeneity in video conferencing, however, it incurs rate and complexity overheads. An alternative is partitioning the receiver sets and using non-layered coding for each group. In this paper, we investigate how to maximize the received video quality for both systems under uplink and downlink capacity constraints, while limiting the number of hops...
Wireless video transmission systems have been widely adopted to facilitate the ubiquitous access of the multimedia services on the Internet. However, wireless links are not stable and the channel quality might vary with time. Efficient modulation scheme plays an important role to improve the quality of service (QoS) of video transmission. However, the previous efforts mainly focused on the rectangular...
Unlike traditional file transfer where only total delay matters, streaming applications impose delay constraints on each packet and require them to be in order. To achieve fast in-order packet decoding, we have to compromise on the throughput. We study this trade-off between throughput and in-order decoding delay, and in particular how it is affected by the frequency of block-wise feedback, whereby...
Recently, data sharing applications among mobile users in cloud computing platforms (e.g., Dropbox and Google Drive) are very popular. In such applications, a cloud server is responsible for synchronization among mobile users and thus the synchronization traffic can be significant when the data are frequently updated and shared by many mobile users. To address this problem, we propose a proxy-based...
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