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The latest experiences hint that the QoS (Quality of Service) approaches adopted by IMS (IP Multimedia Subsystem) technologies are still suffering from a primary containment factor due to the nondifferentiation between IPTV (Internet Protocol Television) video components. The success of IPTV services depends on how the customer perceives QoS related to the provided stream. The satisfaction of this...
This paper sketches a service-oriented and hierarchical queuing mechanism designed to manage radio buffers while delivering web services. The goal is avoid buffer overflow implementing a three-level queuing mechanism. The first level is the message queue which stores messages from user-facing services. At the second level, the messages are fragmented into IP packets which are stored in the packet...
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...
This paper offers a comparative analysis of quality of service (QoS) of the queuing disciplines Priority Queuing (PQ), Custom Queuing (CQ), Weighted Fair Queuing (WFQ), Class-Based Weighted Fair Queuing (CBWFQ) and Low-Latency Queuing (LLQ), with self-similar and long-range dependent traffic, through experimental measurements with routers. We take into account two different classes of traffic: real-time...
For reenterable models of IP networks with dynamic routing according to RIP protocol, measuring subnets for QoS parameters evaluation have been essentially modified and extended. Online algorithms of statistical analysis have been specified by colored Petri nets. The mean and variance of the packet delivery time have been evaluated. As a result, the computation precision has grown and an essential...
The performance evaluation in the case of communication radio networks is different from that the single-link communication. The formation of complex heterogeneous communication networks due to the different levels of communication makes the lack of a unified and systematic assessment framework in terms of assessment principles, criteria, methods and evaluation index systems. According to the network...
Qos of broadband network is important. ISPs have some methods for evaluate it. But they are not efficient enough. This paper present a new method in which delay and scale of windows of TCP messages are used for evaluating performance of broadband. Comparison between delay or scale of window s of samples is the core idea of the method. There are two kinds of comparison. One is absolute terms of above-mentioned...
Due to the unique data structure, the big datagram is prone to packet loss during the network outburst transmission process, especially in the space TT&C (Tracking, Telemetry and Communication) network which is very strict in real time. This paper focuses on the analysis of the transmission mechanism of big datagram, expatiates its fragmentation, reorganization and Re-fragmentation mechanism....
This paper is an up-to-date short overview of the QoS for Satellite IP networks. Some definitions, parameters and requirements for QoS are given. IP QoS Architectures are presented and various contributions to end-to-end QoS at each layer are included. DVB-RCS and evolution to standard DVB-S2 - RCS to support emerging Internet services via satellite is also briefly approached. Possible integration...
Congestion in today's mobile networks is mainly managed by end to end congestion control algorithms such as TCP. However, in spite of its many merits, TCP does not cope well with the high variability inherent to radio links and customer experience may sometimes be poor as TCP reveals unable to rapidly grasp such a fluctuating bandwidth. To remedy this problem, we introduce in this paper a new proposal...
Differentiated Services (DiffServ) provides a means for applications to classify traffic into Quality of Service (QoS) classes by reading the Differentiated Services Code Point (DSCP) field in the IP header and then mapping traffic to a specific QoS forwarding treatment. This paper provides new measurement data that examines how the DSCP is altered as packets traverse mobile broadband access networks...
Currently deployed backbone/metro networks rarely supports dynamically configurable multicasting. One of the major reasons is the high complexity and low scalability of current multicasting solutions. Alternative multicasting solutions are emerging based on Software Defined Networking (SDN), indeed, using a central controller simplifies the multicast tree management but still requires the explicit...
The use of real-time multimedia applications in IP networks is continuously increasing with the services provided by the evolving internet infrastructure. Providing Quality of Service (QoS) is important for service providers in terms of real-time voice and video services to meet users' expectations. For this reason, QoS parameters such as network latency, jitter and packet loss must be accurately...
The success of telecom operators is based on several criteria including but not limited to the diversity of services. The competition between operators is needed to improve and ensure customers loyalty by providing interesting services. For this purpose IP Multimedia Subsystem (IMS) has been a major work effort of the 3GPP (3rd Generation Partnership Project) standards bodies for several years now...
Providing a resiliency measure for communication networks is one of the challenges towards its Dynamic Security Assessment. This paper introduces a resiliency measure, called Level-of-Resilience (LoR) for communication networks, determined by examining: (i) the Level-of-Stability-Reduction (LoSr), as captured by percentage of “IP traffic dropped”, (ii) the eventual Level-of-Performance-Reduction (LoPr),...
Cross-layer design is a suitable approach that can address some of throughput challenges for future multimedia applications. In this regard, effective capacity concept offers a suitable metric to assess the implications that physical layer design may have on link layer performance. However, most reported studies in this aspect consider the case of downlink scenario for convenience multiple input multiple...
This paper presents the definition and a proof-of-concept implementation of an intent-based northbound interface (NBI) used to orchestrate dynamic service chaining of Virtualized Network Functions (VNFs) by actively controlling the underlying network infrastructure through vendor-independent, technology-agnostic policies. The proof of concept considers a general scenario where VNFs are hosted in different...
We propose algorithms that uses fast graph mining for resolving the network topology to a locally regulated area defined as a component of network topology. Though the IP backbone network should be reconfigured periodically in accordance with environmental changes, reconfiguration results in heavy workload, such as routing re-designs or testing these re-designs for network operators. If a network...
Given the growing demands for network services based sometimes on reduced resources, efficient solutions are continuously developed in order to operate the network infrastructures in optimum conditions. From network management viewpoint, the main challenge is related to traffic management solutions using data flow limitations for some specific users while giving higher priorities to others. If for...
Providing proper technical solutions to cover all requirements of the Voice over LTE (VoLTE) service is still a great challenge for operators. Network monitoring is one of the important methods to support service verification, deployment and operations. The VoLTE service utilizes both the LTE Evolved Packet Core (EPC), and the IP Multimedia Subsystem (IMS). These architectures are built on different...
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