Maximum Completion Time Optimization in Uplink Multi-Subcarrier NOMA Systems

作者：Guo, Yongna; Sung, Chi Wan^*; Liu, Ye; Chen, Chung Shue

来源：IEEE Wireless Communications Letters, 2023, 12(7): 1214-1218.

DOI：10.1109/LWC.2023.3267816

• NOMA
• Resource management
• Internet of Things
• Decoding
• Uplink
• Optimal scheduling
• Receivers
• scheduling
• maximum completion time
• Index Terms
• power allocation
• user pairing

Maximum completion time is a key performance metric for future wireless applications that have stringent latency requirements. This letter studies its optimization in uplink multi-subcarrier non-orthogonal multiple access (NOMA) networks. The joint optimization problem of power allocation, user pairing and scheduling is analyzed and proved to be NP-hard. To tackle the problem, the power allocation subproblem for a single NOMA pair is first derived. Next, for the joint user pairing and scheduling subproblem, an optimal algorithm for a special case is constructed and a suboptimal algorithm for the general case is designed. Our proposed scheme is applicable to data aggregation in wireless federated learning networks, and simulation results validate its superior performance.