Optimization of Rate Allocation and Power Control for Rate Splitting Multiple Access (RSMA)
In this paper, the sum-rate maximization problem is studied for wireless
networks that use downlink rate splitting multiple access (RSMA). In the
considered model, each base station (BS) divides the messages that must be
transmitted to its users into a private' part and a common' part. Here, the
common message is a message that all users want to receive and the private
message is a message that is dedicated to only a specific user. The RSMA
mechanism enables a BS to adjust the split of common and private messages so as
to control the interference by decoding and treating interference as noise and,
thus optimizing the data rate of users. To maximize the users' sum-rate, the
network can determine the rate allocation for the common message to meet the
rate demand, and adjust the transmit power for the private message to reduce
the interference. This problem is formulated as an optimization problem whose
goal is to maximize the sum-rate of all users. To solve this nonconvex
maximization problem, the optimal power used for transmitting the private
message to the users is first obtained in closed form for a given rate
allocation and common message power. Based on the optimal private message
transmission power, the optimal rate allocation is then derived under a fixed
common message transmission power. Subsequently, a one-dimensional search
algorithm is proposed to obtain the optimal solution of common message
transmission power. Simulation results show that the RSMA can achieve up to
15.6\% and 21.5\% gains in terms of data rate compared to non-orthogonal
multiple access (NOMA) and orthogonal frequency-division multiple access
(OFDMA), respectively.
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