Spectrum aggregation strategy in multi-user cooperative relay networks

In order to meet the increasing demands of high-speed and high-quality data service, cooperative relay and spectrum aggregation technologies have attracted much attention due to their efficiency in improving spectrum utilization. Combing cooperative relay and spectrum aggregation technologies, this paper focuses on multi-user and multi-relay scenario on the condition of ensuring the user channel capacity to maximize the network throughput. At first, according to the estimated value of throughput, each relay select a source node to service, and then based on the common idle spectrum of source and relay nodes, we adopted the greedy algorithm to obtain a optimal spectrum aggregation strategy. The simulation results show that the proposed strategy has improved the network throughput greatly, and the parameters such as the spectrum number have a large effect on the efficiency.