Adaptive Fair Resource Allocation and Packet Dependent Scheduling Using Cross-Layer Design in Multiuser OFDM Systems
Keywords:
Cross-layer design, dynamic resource allocation, fairness, OFDM, packet scheduling, quality of service (QoS).Abstract
In this paper, we consider a multiuser orthogonal
frequency division multiplexing (OFDM) system and propose a fair resource allocation algorithm using cross-layer design with packet dependent scheduling. Our proposed algorithm achieves fairness among users (in proportion of weights of users) while maximizing the weighted sum capacity of users. Since the optimal solution to the problem is computationally complex to
obtain, a low-complexity suboptimal algorithm is proposed. It is assumed that each user is having multiple heterogeneous traffic queues. It is a user based resource allocation algorithm where weight of user can be calculated by summing up the weight of all packets in all the queues of that user. A packet dependent scheduling scheme is also used at medium access control (MAC) layer to determine the packet transmission order according to their weights. The weight of a packet is decided by its size, delay
tolerance, and quality of service (QoS) priority level.
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