Energy-efficient video multicast in 4G wireless systems
Journal
IEEE Transactions on Mobile Computing
Journal Volume
11
Journal Issue
10
Pages
1508-1522
Date Issued
2012
Author(s)
Abstract
Layer-based video coding, together with adaptive modulation and coding, is a promising technique for providing real-time video multicast services on heterogeneous mobile devices. With the rapid growth of data communications for emerging applications, reducing the energy consumption of mobile devices is a major challenge. This paper addresses the problem of resource allocation for video multicast in fourth-generation wireless systems, with the objective of minimizing the total energy consumption for data reception. First, we consider the problem when scalable video coding is applied. We prove that the problem is NP-hard and propose a 2-approximation algorithm to solve it. Then, we investigate the problem under multiple description coding, and show that it is also NP-hard and cannot be approximated in polynomial time with a ratio better than 2, unless P=NP. To solve this case, we develop a pseudopolynomial time 2-approximation algorithm. The results of simulations conducted to compare the proposed algorithms with a brute-force optimal algorithm and a conventional approach are very encouraging. ? 2012 IEEE.
Subjects
4G wireless systems.
adaptive modulation and coding
Energy efficiency
multiple description coding
scalable video coding
video multicast
SDGs
Other Subjects
4G wireless; Adaptive modulation and coding; Multiple description coding; Scalable video coding; Video multicast; 4G mobile communication systems; Adaptive modulation; Computational complexity; Energy efficiency; Energy utilization; Mobile devices; Multicasting; Polynomial approximation; Approximation algorithms
Type
journal article