The Node Distribution of the Random Waypoint Mobility Model for Wireless Ad Hoc Networks
IEEE Transactions on Mobile Computing
Wireless Communications
Isolation band based frequency reuse scheme for IEEE 802.16j wireless relay networks
Proceedings of the 5th International ICST Conference on Heterogeneous Networking for Quality, Reliability, Security and Robustness
Analysis of optimal relay selection in IEEE 802.16 multihop relay networks
WCNC'09 Proceedings of the 2009 IEEE conference on Wireless Communications & Networking Conference
WCNC'09 Proceedings of the 2009 IEEE conference on Wireless Communications & Networking Conference
Joint base station and relay station placement for IEEE 802.16j networks
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Uplink capacity of multi-class IEEE 802.16j relay networks with adaptive modulation and coding
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Recipient maximization routing scheme for multicast over IEEE 802.16j relay networks
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
A novel relay placement mechanism for capacity enhancement in IEEE 802.16j WiMAX networks
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Multinode Cooperative Communications in Wireless Networks
IEEE Transactions on Signal Processing
IEEE 802.16J relay-based wireless access networks: an overview
IEEE Wireless Communications
IEEE Transactions on Wireless Communications
Cooperative diversity in wireless networks: Efficient protocols and outage behavior
IEEE Transactions on Information Theory
Computer Networks: The International Journal of Computer and Telecommunications Networking
Efficient and adaptive resource scheduling in IEEE 802.16j transparent relay networks
Computer Networks: The International Journal of Computer and Telecommunications Networking
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The IEEE 802.16j standard is defined to enhance WiMAX networks with relay capacity. Under the transparent mode, existing studies only target improving network throughput by increasing the transmission rates of mobile stations (MSs) and maximizing concurrent transmissions. However, using a higher transmission rate or allowing more concurrent transmissions could harm MSs in terms of their energy consumption, especially when they are battery-powered. In this paper, we consider the energy-conserved resource allocation problem in the uplink direction of an IEEE 802.16j network under the transparent mode. This problem asks how to arrange the frame usage with satisfying MSs' demands as the constraint and minimizing their total energy consumption as the objective. We prove this problem to be NP-complete and develop two energy-efficient heuristics, called demand-first allocation (DFA) and energy-first allocation (EFA) schemes. These heuristics employ a gradient-like search method to approximate the optimal solution. Specifically, DFA tries to satisfy MSs' demands first by using as less frame space as possible. Then, with the remaining frame space, DFA tries to save MSs' energy by lowering their transmission rates or adjusting their transmission paths. Viewed from a different perspective, EFA first allocates the frame space to MSs to consume the least energy. Since the total allocation may exceed the frame space, EFA then exploits spatial reuse and rate adjustment to pack all demands into one frame. Simulation results show that our heuristics can approximate the ideal performance bounds and save up to 90% of MSs' energy as compared to existing results.