Joint scheduling and resource allocation in uplink OFDM systems.
Huang, Jianwei and Subramanian, Vijay G. and Berry, Randall and Agrawal, Rajeev (2007) Joint scheduling and resource allocation in uplink OFDM systems. In: Conference Record of the Forty-First Asilomar Conference on Signals, Systems and Computers, 2007, Pacific Grove, CA , 4-7 Nov. 2007. ACSSC 2007. IEEE, pp. 265-269. ISBN 978-1-4244-2109-1
Orthogonal Frequency Division Multiplexing (OFDM) with dynamic scheduling and resource allocation is widely considered to be a key component of 4G cellular networks. However, scheduling and resource allocation in an OFDM system is complicated, especially in the uplink due to two reasons: (1) the discrete nature of channel assignments, and (2) the heterogeneity of the users' channel conditions, individual resource constraints and application requirements. We approach this problem using a gradient-based scheduling framework presented in previous work. Physical layer resources (bandwidth and power) are allocated to maximize the projection onto the gradient of a total system utility function which models application-layer Quality of Service (QoS). This is formulated as a convex optimization problem. We present an optimal solution using a dual decomposition. This solution has prohibitively high computational complexity but reveals guiding principles that we use to generate a family of lower complexity sub-optimal algorithms. We compare the performance of these algorithms via a realistic OFDM simulator.
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