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Quality of Service (QoS) in data networks refers to control mechanisms for reservation of network resources and traffic prioritization for specific network applications and types of data flows. Every network application can have their own demands for specific QoS parameters, such as bandwidth, delay, jitter or packet loss. Rapid grow of Internet has initiated the development of the Internet protocol...
The response time critical application is defined as an application which misbehaves if a certain delay of communication is reached. Generally accepted example of such application is VoIP communication. This article focuses on the current IP transport layer protocols, i.e. TCP, UDP and SCTP and their suitability for real time signaling transport. Each protocol deals differently with the problem of...
It has been very important to acknowledge the performance of the network to allocate resources better in the future. Network performance may behave dissimilar in different environments, and it causes important quality problems for network required applications. Based on the distributed network performance measurement system and deployed PlanetLab nodes, the characteristics of delay across the world...
Basic requirements to the quality of service in LTE network, various real life use cases are considered. LTE provides basic IP connectivity on the platform of IMS. Mobile devices capable of using LTE network will need to support voice calling over the Internet protocol. Thus, VoIP is the first application considered. With the availability of a larger data pipe, another common application is viewing...
Publish/subscribe or "push" communication has been proposed as a new network service. In particular, in a content-based network, messages sent by publishers are delivered to subscribers based on the message content and on subscribers' long-term interests (subscriptions). In most systems that implement this form of communication, messages are treated as datagrams transmitted without end-to-end...
Voice over IP (VoIP) is increasingly replacing fixed line telephone systems globally due to lower cost, call quality improvement. More and more application improvement and Video communication is emerging as an alternative to traditional public communication. End-to-end QoS for large Enterprise consists of three general areas: cutomer premises QoS ("LAN QoS"), Service Provider (SP) core network...
Service level agreements (SLAs) define performance guarantees made by service providers, e.g., in terms of packet loss, delay, delay variation, and network availability. In this paper, we describe a new active measurement methodology to accurately monitor whether measured network path characteristics are in compliance with performance targets specified in SLAs. Specifically, we: 1) introduce a new...
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