Optimal Resource Allocation for CR Networks with Multi-Group Multicast Based on Inter-Group and Inner-Group Cooperation Transmission

Multicast technology will play a very important role in the future multimedia communication application. In this paper, a new transmission mechanism called multi-group multicast (MGMC) based on inter-group and inner-group cooperation is proposed for cognitive networks. The new transmission mechanism sets multiply multicast groups as a pair, and then these multicast groups transmit information in a cooperative way by using the same frequency resource. We formulate a weighted overall rate optimization problem with interference constraints to the primary user (PU) and peak power constraint at each user and obtain the optimal solution by theoretical analysis in this new transmission model. Numerical results show the impact of user number on rate for every multicast group.