We define a novel core network router scheduling architecture called priority switching scheduler (PSS), to carry and isolate time constrained and elastic traffic flows from best-effort traffic. To date, one possible solution has been to implement a core DiffServ network with standard fair queuing and scheduling mechanisms as proposed in the well-known “A Differentiated Services Code Point (DSCP) for Capacity-Admitted Traffic” from RFC5865. This architecture is one of the most selected solutions by internet service provider for access networks (e.g., customer-premises equipment) and deployed within several performance-enhancing proxies (PEPs) over satellite communications (SATCOM) architectures. In this study, we argue that the proposed standard implementation does not allow to efficiently quantify the reserved capacity for the AF class. By using a novel credit-based shaper mechanism called burst limiting shaper (BLS) to manage the AF class, we show that PSS can provide the same isolation for the time constrained EF class while better quantifying the part allocated to the AF class. PSS operates both when the output link capacity is fixed (e.g., wire links and terrestrial networks) or might vary due to system impairments or weather condition (e.g., wireless or satellite links). We demonstrate the capability of PSS through an emulated SATCOM scenario with variable capacity and show the AF output rate is less dependent on the EF traffic, which improves the quantification of the reserved capacity of AF, without impacting EF traffic.

中文翻译：

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优先级切换调度器

我们定义了一种新颖的核心网络路由器调度架构，称为优先级交换调度程序（PSS），用于承载时间受限且弹性的流量并将其与尽力而为的流量隔离。迄今为止，一种可能的解决方案是实施具有标准公平排队和调度机制的核心 DiffServ 网络，如 RFC5865 中著名的“容量接纳流量的区分服务代码点 (DSCP)”中所提出的。该架构是互联网服务提供商为接入网络（例如客户端设备）选择最多的解决方案之一，并部署在多个卫星通信（SATCOM）架构上的性能增强代理（PEP）中。在本研究中，我们认为拟议的标准实施不允许有效地量化 AF 类的保留容量。通过使用一种称为突发限制整形器 (BLS) 的新型基于信用的整形器机制来管理 AF 类，我们表明 PSS 可以为时间受限的 EF 类提供相同的隔离，同时更好地量化分配给 AF 类的部分。PSS 在输出链路容量固定（例如有线链路和地面网络）或可能因系统损伤或天气状况而变化（例如无线或卫星链路）时运行。我们通过具有可变容量的模拟卫星通信场景演示了 PSS 的功能，并表明 AF 输出速率对 EF 流量的依赖性较小，这提高了 AF 保留容量的量化，而不影响 EF 流量。