Springer Science+Business Media
In this paper, the authors investigate resource allocation for network-coded primary-secondary cooperation in Orthogonal Frequency Division Multiplexing (OFDM)-based cognitive multicast networks, in which Cognitive Radio (CR), Network Coding (NC), multicast and OFDM are effectively combined toward the spectrum efficient Fifth Generation (5G) wireless communication systems. Different from the conventional one-to-one/one-to-more primary-secondary cooperation, the paper concentrates on two-to-one primary-secondary cooperation, in which one Secondary User (SU) cooperates with two Primary Users (PUs) to gain more spectrum access opportunities. To accomplish the cooperation, an agreement is established between the SU and PUs. Meanwhile, to alleviate spectrum bands consumed for PUs' data transmission, network coding is employed at the SU transmitter.