Optimal Delay Equilibrium and Power Control Method for Two-user Non-orthogonal Multiple Access
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摘要: 该文针对采用非正交多址接入(NOMA)技术的两用户单小区网络，考虑信道衰落的随机性和业务到达的动态性，以均衡用户排队时延并最大化网络总吞吐量为目标，构建了资源管理的随机优化问题。基于李雅普诺夫优化方法，推导了随机优化问题的最优解的闭式表达式，并提出一种低复杂度的联合时延均衡和功率控制的最优资源管理方法。对比了采用NOMA时的次优资源管理方法与采用时分多址接入方法时的最优资源管理方法，仿真结果表明所提方法能够显著提升网络性能。Abstract: A two-user single cell network employing Non-Orthogonal Multiple Access (NOMA) technique is studied. Accounting for time-varying channel fading and dynamic traffic arrival, a stochastic optimization issue is formulated, which aims to balance the queue delay of users and maximize the network total throughput. Based on Lyapunov optimization method, the closed-form optimal solution of the stochastic optimization issue is derived, and a low-complexity optimal delay equilibrium and power control method is proposed. The method is compared with a NOMA scheme using a non-optimal resource management method and a Time Division Multiple Access (TDMA) scheme with an optimal resource management method. Simulation results show that the proposed method can significantly improve network performance.
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Key words:
- Non-Orthogonal Multiple Access (NOMA) /
- Delay equilibrium /
- Power control
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