Background Wireless links are fast becoming the key communication mode. However, as compared to the wired link, their characteristics make the traffic prone to time- and location-dependent signal attenuation, noise, fading, and interference that result in time varying channel capacities and link error rate. Scheduling algorithms play an important role in wireless links to guarantee quality of service (QoS) parameters such as throughput, delay, jitter, fairness and packet loss rate. The scheduler has vital importance in current as well as future cellular communications since it assigns resource block (RB) to different users for transmission. Scheduling algorithm makes a decision based on the information of link state, number of sessions, reserved rates and status of the session queues. The information required by a scheduler implemented in the base station can easily be collected from the downlink transmission. Methods This paper reflects on the importance of schedulers for future wireless communications taking LTE-A networks as a case study. It compares the performance of four well-known scheduling algorithms including round robin (RR), best channel quality indicator (BCQI), proportional fair (PF), and fractional frequency reuse (FFR). The performance of these four algorithms is evaluated in terms of throughput, fairness index, spectral efficiency and overall effectiveness. System level simulations have been performed using a MATLAB based LTE-A Vienna downlink simulator. Results The results show that the FFR scheduler is the best performer among the four tested algorithms. It also exhibits flexibility and adaptability for radio resource assignment.

中文翻译：

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未来通信网络无线资源分配调度算法对比分析

背景 无线链路正迅速成为关键的通信方式。然而，与有线链路相比，它们的特性使得流量容易受到时间和位置相关的信号衰减、噪声、衰落和干扰，从而导致信道容量和链路错误率随时间变化。调度算法在无线链路中发挥着重要作用，以保证服务质量 (QoS) 参数，例如吞吐量、延迟、抖动、公平性和丢包率。调度器在当前和未来的蜂窝通信中具有至关重要的意义，因为它将资源块 (RB) 分配给不同的用户进行传输。调度算法根据链路状态、会话数、预留率和会话队列状态等信息做出决策。基站中实现的调度器所需的信息可以很容易地从下行链路传输中收集。方法 本文以 LTE-A 网络为例，反映了调度器对未来无线通信的重要性。它比较了四种著名的调度算法的性能，包括循环 (RR)、最佳信道质量指标 (BCQI)、比例公平 (PF) 和分数频率重用 (FFR)。这四种算法的性能从吞吐量、公平指数、频谱效率和整体有效性方面进行评估。已使用基于 MATLAB 的 LTE-A Vienna 下行链路仿真器执行系统级仿真。结果 结果表明，FFR 调度器是四种测试算法中性能最好的。