Publications

Time-Based Demand-Constrained Cross-Layer Resource Allocation for Wireless Networks

Authors: Karim E. Morsy, Mohammed H. Nafie, Fadel F. Digham, Ayman Elezabi

This paper to appear in IEEE ICC 2010.

Abstract— Efficient resource allocation is a critical component in multi-user QoS communications and high speed networks. In this paper, we devise a mathematical model for the resource allocation problem that takes into account the users' demands in a PHY-MAC cross-layer design fashion. Incorporating the time axis in our model, the target is to maximize the number of bits transmitted in a given frame rather than maximizing the channel capacity. Our design is governed by constraints on users' demands (expressed in bits), energy expenditure, and time frame. We model the allocation problem as an optimization problem whose solution allocates channels, time span, and power levels to each user. We also derive an upper bound on the performance of any resource allocation algorithm and demonstrate the tightness of the bound, especially at high user demands. We then evaluate a heuristic cross-layer resource allocation algorithm proposed earlier using the bound.

Keywords— LTE, WiMAX, MAC, Adaptive resource allocation, Dynamic spectrum access, Cognitive radio, Cross layer, OFDMA.

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