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Current mobile networks are based on orthogonal multiple access (OMA), in which at most one user is served in a resource block (RB). Unlike OMA, non-orthogonal multiple access (NOMA) enables an RB to be accessed by multiple users concurrently, thus improving RB usage efficiency. In this paper, we study resource allocation for NOMA when coordinated multipoint (CoMP) transmission is supported and users have minimum rate requirements. Given a NOMA/user pair, we derive closed-form formulas for optimal power allocation that maximizes utility, which is a weighted sum of rates of the two users. We also develop an efficient method for user pairing, in order to maximize the number of users whose rate requirements are met. Simulation results show that our method results into better performance in terms of the number of well-served users and total utility.

Non-orthogonal multiple access (NOMA) is a promising technology for future mobile networks due to superior spectrum efficiency. In this paper, we model the interaction between the base station and multiple users as a Stackelberg game and devise a fast resource allocation method consisting of resource block allocation and power allocation. The objective is to serve as many users as possible at rates beyond their requirements, while seeking to enhance total revenue. We derive a closed-form formula for optimal power allocation. Besides, we convert the resource block allocation problem into the problem of finding a maximum weight independent set for a chordal graph, which only takes linear time. Simulation results show that the fast method we propose outperforms existing algorithms in total throughput and the number of users whose rate demands are attained.