Optimized two-level scheduler for video traffic in LTE downlink framework,International Journal of Communication Systems

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Optimized two-level scheduler for video traffic in LTE downlink framework
International Journal of Communication Systems ( IF 1.7 ) Pub Date : 2021-06-06 , DOI: 10.1002/dac.4704
Mohamad I. Elhadad _{1,

2} , Walid El‐Shafai _{2,

3} , El‐Sayed M. El‐Rabaie ₂ , Mohammed Abd‐Elnaby ₄ , Fathi E. Abd El‐Samie _{2,

5}

Affiliation

The most challenging issue in long-term evolution (LTE) mobile networks is the design of an optimal scheduler. The main target of the LTE scheduling strategy is to guarantee a certain level of quality of service (QoS) in order to satisfy users' needs. In this work, a novel queue-optimized two-level scheduling strategy is introduced. The queue-optimized scheduler has the ability to support both real-time (RT) and non-RT (NRT) services in the LTE downlink framework. The first level of the proposed scheduler depends on an optimized queue length threshold that is dynamically adapted to adjust the assigned resources for the video traffic to maintain the throughput around its average value. The proposed scheduling strategy is utilized to efficiently enhance the radio resource allocation process for video traffic by minimizing the allocation of any excess unwanted resources, which consequently facilitates the support of more video connections and enhances the overall network spectral efficiency. The distribution of the resources among users for RT and NRT applications is actually performed at the second level of the scheduling process. The physical resource blocks (PRBs) are assigned according to the enhanced earliest due date first (EEDDF) mechanism. The proposed scheduling strategy prioritizes users according to their service requirements, to improve the QoS provision. The proposed scheduler maximizes the video applications throughput, and generally, minimizes the packet delay and the packet loss rate (PLR) for RT applications.

中文翻译：

优化LTE下行框架中视频流量的两级调度器

长期演进 (LTE) 移动网络中最具挑战性的问题是最佳调度器的设计。LTE调度策略的主要目标是保证一定水平的服务质量（QoS）以满足用户的需求。在这项工作中，引入了一种新颖的队列优化两级调度策略。队列优化调度器能够同时支持 LTE 下行链路框架中的实时 (RT) 和非 RT (NRT) 服务。建议的调度器的第一级取决于优化的队列长度阈值，该阈值动态地调整为视频流量分配的资源，以将吞吐量保持在其平均值附近。所提出的调度策略用于通过最小化任何多余的不需要的资源的分配来有效地增强视频流量的无线电资源分配过程，从而促进对更多视频连接的支持并提高整体网络频谱效率。RT 和 NRT 应用程序的用户之间的资源分配实际上是在调度过程的第二级进行的。物理资源块 (PRB) 根据增强型最早到期日期优先 (EEDDF) 机制进行分配。所提出的调度策略根据用户的服务需求对用户进行优先级排序，以提高 QoS 提供。建议的调度器最大化视频应用吞吐量，并且通常最小化 RT 应用的数据包延迟和数据包丢失率 (PLR)。

更新日期：2021-07-06

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