Abstract
A collaborative access scheme that exploits the broadcast nature of the wireless communication in order to achieve multicast content delivery is presented in this paper. The key idea is that individual clients requesting for the same content can collaborate and share the same data channel. As opposed to broadcasting, this method enables the clients to determine online the delivered content, and thus supports on‐demand services. On the other hand, a multicast content delivery is much more efficient than a unicast content distribution, which must use a dedicated data channel per each and every client. This method is particularly suitable for sessions having a long‐time duration, for applications in which clients can subscribe to ahead of time, and for applications in which the clients receive the same information simultaneously. A multicast content distribution increases the network service throughput in terms of the expected number of clients served simultaneously, and therefore it offers a reduced waiting time for content delivery at highly loaded time periods. It is shown that the problem of maximizing the efficiency of distributing a content in a wireless network is NP‐hard. An approximation algorithm is therefore used, that for any 0 < ε < 1 finds an approximation solution with a relative accuracy ε. The proposed method does not require any hardware modification on the network equipment. Thus, it can be easily implemented.
Highlights
The concept of collaborative wireless networking is emerging as a promising technology to enhance system performance by sharing wireless resources among the demanding clients
The focus in this study is to use an application layer collaborative method in order to establish a virtual multiple-input multiple-output (MIMO) system. Video applications, such as near video-on-demand (NVOD) service, are characterized by sessions having a relatively long-time duration, and a relatively high arrival rate of clients requesting for the same data
The approach adopted by manufactures of wireless communication equipment for advanced content distribution over wireless networks is to build dedicated broadcast networks for what is known as “mobile TV.”
Summary
The concept of collaborative wireless networking is emerging as a promising technology to enhance system performance by sharing wireless resources among the demanding clients. Even a moderate demand for video streaming can exceed the system available bandwidth For this reason, the approach adopted by manufactures of wireless communication equipment for advanced content distribution over wireless networks is to build dedicated broadcast networks for what is known as “mobile TV.”. The approach adopted by manufactures of wireless communication equipment for advanced content distribution over wireless networks is to build dedicated broadcast networks for what is known as “mobile TV.” These networks are expected to use a new infrastructure, based on either DVB-H [1] or MediaFlo [2] standards. There are three representative approaches for content distribution: media servers replication, using existing proxies for media data buffering, and constructing peer-to-peer overlay networks, dedicated to content distribution These schemes were designed mostly for wired. It would be desirable to use this property to utilize the scarce wireless bandwidth more efficiently
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