Resource Allocation for Delay Differentiated Traffic in Multiuser OFDM Systems

Abstract-- Most existing work on adaptive allocation of subcarriers and power in multiuser OFDM systems has focused on homogeneous traffic consisting of delay-constrained data (guaranteed service) or delay-tolerant data (best-effort service) only. In this work, we investigate the resource allocation problem in a heterogeneous multiuser OFDM system with both delayconstrained (DC) and no-delay-constrained (NDC) traffic. The objective is to maximize the sum-rate of all the users with NDC traffic while maintaining guaranteed rates for the DC traffic under a total transmission power constraint. Finding the optimal allocation of subcarriers and power is formulated as a convex programming problem. An iterative algorithm is proposed to compute the optimal solutions numerically. A low-complexity suboptimal allocation algorithm is also presented. Simulation experiments are conducted to evaluate the performance of the proposed algorithms in terms of service outage probability and achievable trans...

• Type: Journal
• Year: 2008
• Where: TWC
• Authors: Meixia Tao, Ying-Chang Liang, Fan Zhang
• Keywords: Multiuser Ofdm, Multiuser Ofdm Systems, NDC Traffic, TWC 2008