NOMA is regarded as a powerful access technology that can be used in 5G mobile communications and is called Next Generation Radio Access (NR).
We studied how to improve the data rate for users in shadow zones and reduce the power consumption of the entire system on a 5G downlink using Power-Domain Non-Orthogonal Multiple Access technology.
From this study, we proposed a shadow zone estimation method and a reasonable pairing method for users in the shadow zone, and also proposed a new transmission scheme in which a paired strong user relays data to a weak user in the shadow zone.
In our work, we make a decision on whether to temporarily stop communication for the worst-case user or to communicate in a cooperative relay mode, to form a reasonable user pair that improves the system throughput while ensuring user fairness.
Power allocation for paired users is not power allocation between different NOMA users within a PRB, but power allocation in different PRBs, providing a higher level of user fairness and spectral efficiency.
The proposed method was evaluated using numerical analysis and simulation.
According to the simulation results, it is confirmed that the proposed method has much less power consumption and better data rate performance compared to the traditional NOMA.
The result has been published in "Lecture Notes in Networks and Systems"(ICAIN 2025, Volume 4) under the title of "Cooperative Relaying NOMA Based Power Allocation for Users in Shadow Zones"(https://doi.org/10.1007/978-3-032-24926-5_12).
