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Issue No.07 - July (2012 vol.11)
pp: 1223-1236
Amin Abdel Khalek , American University of Beirut, Beriut and The University of Texas at Austin
Zaher Dawy , American University of Beirut, Beirut
For real-time video broadcast where multiple users are interested in the same content, mobile-to-mobile cooperation can be utilized to improve delivery efficiency and reduce network utilization. Under such cooperation, however, real-time video transmission requires end-to-end delay bounds. Due to the inherently stochastic nature of wireless fading channels, deterministic delay bounds are prohibitively difficult to guarantee. For a scalable video structure, an alternative is to provide statistical guarantees using the concept of effective capacity/bandwidth by deriving quality of service exponents for each video layer. Using this concept, we formulate the resource allocation problem for general multihop multicast network flows and derive the optimal solution that minimizes the total energy consumption while guaranteeing a statistical end-to-end delay bound on each network path. A method is described to compute the optimal resource allocation at each node in a distributed fashion. Furthermore, we propose low complexity approximation algorithms for energy-efficient flow selection from the set of directed acyclic graphs forming the candidate network flows. The flow selection and resource allocation process is adapted for each video frame according to the channel conditions on the network links. Considering different network topologies, results demonstrate that the proposed resource allocation and flow selection algorithms provide notable performance gains with small optimality gaps at a low computational cost.
Scalable video coding, real-time video broadcast, statistical QoS guarantees, mobile-to-mobile cooperation.
Amin Abdel Khalek, Zaher Dawy, "Energy-Efficient Cooperative Video Distribution with Statistical QoS Provisions over Wireless Networks", IEEE Transactions on Mobile Computing, vol.11, no. 7, pp. 1223-1236, July 2012, doi:10.1109/TMC.2011.127
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