一种SUTN网络中用户接入信道的调度算法

A scheduling algorithm for user access channel for Satellite-Unmanned Aerial Vehicle-Terrestrial Network

摘要:

针对多用户的卫星-无人机-地面通信网络(SUTN)的用户接入信道问题，提出基于遍历容量的调度算法(ECSA)。卫星通过空间光通信(FSO)向无人机(UAV)传输数据；UAV采用无线通信射频(RF)链路向用户传输数据。ECSA算法通过推导无人机端和用户端的信噪比，再推导出信噪比的概率密度函数，然后依据概率密度函数计算用户的遍历容量；最后，依据公平原则，并结合用户的遍历容量，计算用户的目标函数，将具有最大的目标函数值的用户优先接入信道。仿真结果表明，相比于轮流调度算法，提出的ECSA算法有效提高了系统容量。

Abstract:

The Ergodic Capacity-based Scheduling Algorithm(ECSA) is proposed to solve the problem of user access to the Satellite-Unmanned Aerial Vehicle(UAV)-Terrestrial Network(SUTN). Satellites transmit data to UAV via Free Space Optical(FSO). The UAV transmits data to the user via a wireless communication Radio Frequency(RF) link. ECSA algorithm firstly derives the Signal-to-Noise Ratios(SNRs) of UAV terminal and the client, then derives the Probability Density Function(PDF) of SNRs, and then calculate the user's Ergodic Capacity(EC) on the basis of probability density function. In the end, it calculate the objective function of the user based on the principles of fairness, combining with the EC of the user.The user with the greatest objective function value will access the channel. Simulation results show that compared with the rotational scheduling algorithm, the proposed ECSA algorithm can effectively improve the system capacity.