QoS aware resource allocation in cooperative OFDMA systems
Jianhua Lü · Journal of Tsinghua University(Science and Technology) · 2011
Most existing resource allocation systems for cooperative orthogonal frequency division multiple access(OFDMA) systems have focused on homogeneous users with the same service and demand levels.This paper focuses on resource allocation in a service differentiated cooperative OFDMA system with quality of services(QoS) guarantees.The analysis formulates the joint power allocation,relay selection and subcarrier assignment to maximize overall system utility.A QoS price is introduced to correct the combinatorial problem with exponential complexity into a convex problem with a two-level dual-primal decomposition based QoS-aware resource allocation algorithm used to solve the problem.Simulations show that this algorithm significantly outperforms previous works in terms of QoS guarantees and system fairness.