Abstract
The quality of service (QoS) in networking is the process of managing network resources to reduce packet loss and to lower network jitter and latency. QoS has been widely used in traditional network and can also be implemented in the 5G standard based on a software-defined network (SDN). A traditional network carries several challenges, such as vendor dependency, the complexity of managing a large network, dynamically changing forwarding policies, and more. Software-defined networking is a new networking strategy designed to address the challenges of a traditional IP network, such as high levels of complexity and inability to adapt to the new quality of service requirements in a timely manner. The fundamental idea behind SDNs compared to the conventional networking paradigm is the creation of horizontally integrated systems through the separation of the control and the data plane while providing an increasingly sophisticated set of abstractions. Recently, various SDN-enabled QoS frameworks have emerged that offer many possibilities for network reconfiguration and high-level definition of policies. QoS requirements for 5G networks have been defined on the basis of three main categories of use cases: extreme mobile broadband (xMBB), massive machine type communications (mMTC) IoT/M2M devices, and highly reliable М2М-communication (ultra-reliable machine-type communications – uMTC). This paper analyzes and surveys the QoS based on the openflow protocol method and QoS based on open-source SDN controllers method in 5G network. In addition, we discuss various architectural issues of open-source SDN controllers network and examine their impact on the QoS. Furthermore, we outline the characteristics of the QoS parameters such as latency, availability, reliability, jitter, and bandwidth in the 5G network. Finally, the article discusses and compares parameters of the QoS in 5G determined by world’s leaders in 5G technology.
Highlights
Financial disclosure: The author has no a financial or property interest in any material or method mentioned
quality of service (QoS) has been widely used in traditional network and can be implemented in the 5G standard based on a software-defined network (SDN)
Software-defined networking is a new networking strategy designed to address the challenges of a traditional IP network, such as high levels of complexity and inability to adapt to the new quality of service requirements in a timely manner
Summary
Архитектура OpenFlow [6] – это предложение инициативы Clean Slate по определению открытого протокола, который устанавливает таблицы пересылки в коммутаторах, это основа архитектуры SDN, в которой пользователь может изменять сеть. По мере увеличения количества коммутаторов OpenFlow использование одного контроллера для всей сети может оказаться невозможным по нескольким причинам: 1. В сети SDN контроллер может работать в трех рабочих режимах для установки нового правила потока: реактивный режим (Reactive mode), проактивный режим (Proactive mode) и гибридный режим (Hybrid mode) [9]. Если совпадения с потоком не найдено, коммутатор пересылает его контроллеру, используя C-DPI, чтобы контроллер решал, как обрабатывать пакет. Как контроллер обработает пакет в соответствии с сетевыми политиками, он создает и отправляет запись потока для установки на сетевом устройстве. В проактивном режиме записи потоков настраиваются в таблицах потоков коммутаторов до того, как на коммутаторы поступят новые потоки. В то время, как проактивный режим вызывает некоторые опасения по поводу неэффективного использования памяти коммутатора, реактивный режим обеспечивает более гибкую и динамичную среду как для контроллеров, так и для коммутаторов
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