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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...
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...
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...
Multi-Processor Systems-on-Chip (MPSoCs) have emerged as an evolution trend to meet the growing complexity of embedded applications with increasing computation parallelism. Particularly, real-time applications make out a significant portion of the embedded field. Networks-on-Chip (NoCs) are the backbone of communications in an MPSoC platform. However, the use of NoCs in real-time systems imposes complex...
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 studies enhancement of Multi-Path TCP(MPTCP), which is one of new transport-layer protocols of TCP/IP protocol suites, by IP routing for improvement of Quality of Experience for a Web service (WebQoE). In order to confirm the effect of IP routing on WebQoE, the author performed experiments with subjects. In the experiment, the subjects assess Quality of Experience of two actual Web services...
This paper considers the problem of managing and maintaining the quality in communication networks. The significance of the end-to-end quality control on all network layers is shown. The problem of projection of the quality of experience requirements posed by customers on the plane of quality of service metrics is stated. Multilevel quality relationship model corresponding to the current state-of-the-art...
With the increasing usage of cloud computing and dependence on a diverse set of distributed applications, users are reliant on consistent outcomes from a shared infrastructure. This drives the need for improved QoS guarantees for heterogeneous communication requirements over shared networks. The Recursive Inter-Network Architecture (RINA) is a fundamental programmable network architecture that provides...
Ensuring network interoperability when IEEE 802.11s-based NAN and LTE-based WAN is deployed for Smart Grid (SG) Advanced Metering Infrastructure (AMI) poses significant challenges. Besides the QoS mismatch between networks, LTE tunneling mechanism becomes an issue when forwarding downlink traffic to IEEE 802.11s network since the gateway of these networks is supposed to be the end device in LTE setup...
The IP Multimedia Subsystem (IMS) is a standard network technology merging voice, data, and multimedia services. IMS is well integrated with existing voice and data in wire and wireless networks. To ease the integration with the Telecom and Internet networks, IMS use SIP (Session Initiation Protocol). The main components of IMS are CSCF's and HSS servers. They are responsible of processing and routing...
Energy saving and quality of service are the most popular but contradictory criteria for resource allocation in IP-over-WMD network. Establishing of direct lightpath according to bypass architecture of IP-over-WMD network becomes reasonable when arriving traffic exceeds some threshold while under the threshold traffic have to be routed via compound path if it exists. On the other hand compound path...
In this paper a method of evaluating connection quality of IP-networks is considered. The mathematical model of the functioning of the network was made and the estimation of the quality parameters of its work for various values of subscriber traffic. In particular, the algorithm of calculating the delay time of the packet transmission network was made when using the quality assurance mechanisms IntServ...
Controlling the jitter buffer at the receiver side is a key component in multimedia and real-time services. A jitter buffer is used to control the packet rate and to compensate for the delay variation, commonly called jitter, by the tradeoff between delay and loss. In this paper, we present simulation results for the relation between the over- and underflow probabilities and the jitter. We then show...
The video, voice, multimedia next-generation applications are using real-time data transmissions. Therefore, taking into account that all these applications are transmitted “over IP”, variable bandwidth has to be provided for specific situations in order to prevent network congestion. The active equipments meet these requirements and provide the network management. However, how will it be if the network...
The performance of the Internet is dominated by that of the TCP which in turn depends that of its congestion control algorithm. The primary purpose of the TCP is to take care of the congestion collapse of Internet and also to act as resource optimization mechanism in best effort environment. However, this makes TCP to be unfriendly with real time applications for which UDP is preferred. There is no...
The IP Multimedia Subsystem (IMS) enables the convergence of voice, data, and multimedia services. IMS is well integrated with existing voice and data networks, while adopting many of their key characteristics. SIP (Session Initiation Protocol) provides a pathway to build a single unified network, bridging the gap that previously existed between the once-separated Telecom and Internet networks. The...
Performance evaluation of VoIP is done by considering the network parameters jitter, packet end to end delay, and packet delay variation. Integration of Quality of Service (QoS) with the Internet Protocol (IP) and Multiprotocol Label Switching (MPLS)networks should enhance the performance of the network. Various scheduling algorithms can be used for implementing QoS on a network. In this paper, the...
Nowadays, world is on going to “Convergence Era”, where data, voice, and video overcome to pass through same network, like IP network. Unfortunately, the fast growth of application technology has not been supported yet by default IP network in the case of quality of service. We have known, that voice over IP services have sensitivity to delay, jitter and latency. And it require of different bandwidth...
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