Abstract
As multimedia traffic has been increasing and is expected to grow more sharply, various technologies using caches have been attracting lots of attention. As one breakthrough technology to deal with the explosively growing traffic, exclusive OR (XOR)-based index coding has been widely investigated because it can greatly enhance the efficiency of network resource by reducing the number of transmissions. In this paper, we investigate how to apply XOR-based index coding to large-scaled practical streaming systems for video traffic that accounts for more than 70% of total Internet traffic. Contrary to most previous studies that have focused on theoretical analysis of optimal performance or development of optimal index coding schemes, our study proposes a new XOR coding-based video streaming (XC). We also propose a new grouping algorithm for creating XC groups while guaranteeing the complete backward compatibility of XC with existing streaming schemes such as unicast (UC), multicast (MC), and broadcast (BC). The performance of the proposed scheme is analyzed in two steps. First, the behavior of video contents in caches at clients is modeled as a Markov chain, and the steady-state probabilities and caching probabilities for each piece of video content are derived. Based on the probabilities, the performance of the proposed system is then analyzed in terms of the average number of connections that each client requires in order to receive one video content. Our numerical results show that the proposed video streaming scheme using XC can reduce the average number of transmissions by up to 18%, compared to the conventional scheme.
Highlights
A recent study showed that the total amount of Internet traffic will increase three-fold over five years from 2017 to 2022, and video traffic would be growing more sharply than other types of traffic [1]
The performance of video streaming scheme using XOR coding-based video streaming (XC) is analyzed in terms of average connections required to serve each client’s video play, and compared with that of a conventional scheme without XC
Let κ denote the number of the required connections of the video streaming schemes
Summary
A recent study showed that the total amount of Internet traffic will increase three-fold over five years from 2017 to 2022, and video traffic would be growing more sharply than other types of traffic [1]. More advanced transmission schemes that use the contents stored in clients’ cache more efficiently were proposed to improve the efficiency of limited network resource [16,17,18,19]. If a transmitter has the perfect information of contents stored in clients’ caches, the transmitter can transmit multiple contents requested by different clients at once by using XOR index coding and each client can recover its content by performing XOR operations of the XOR coded data and contents stored in its cache, which can enhance the efficiency of network resource by reducing the number of transmissions[16]. Based on the statistical characteristics of caches, the performance of the proposed system is analyzed in terms of the average number of connections that each client requires in order to receive one video content.
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