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The availability and reasonable cost of broadband Internet made it an attractive and favourable option to billions of users worldwide. Being a fast service also encourages its users to use real-time applications which is streaming and live data transfer includes VoIP and video streaming. The performance of such applications in Wireless Local Area Network (WLAN) may be highly affected by security protocols...
The availability and reasonable cost of broadband Internet made it an attractive and favourable option to billions of users worldwide. Being a fast service also encourages its users to use real-time applications which is streaming and live data transfer includes VoIP and video streaming. The performance of such applications in Wireless Local Area Network (WLAN) may be highly affected by security protocols...
Currently and due to its wide use, the wireless networks in conformance with IEEE 802.11 standard are generating channels saturation, that provokes interference between themselves. IEEE 802.11n is one of the standards that offers greater benefits to improve the wireless network performance. In this paper we analyze the performance of wireless network in conformance with IEEE 802.11n standard to evaluate...
In this article, we analyze the performance evaluation of WiFi technology in conformance with IEEE 802.11b/n/ac standards and Wireless Distribution System (WDS) for indoor environments with and without obstacles. We present different scenarios by varying the distance between transmitter and receiver. We analyzed the performance of the network by using the intrusive technique of traffic injection with...
This paper focuses on proposing approaches for the improvement of Voice over Internet Protocol (VoIP) service quality in Wireless Mesh Network (WMN). While WMNs have self-healing, self-forming and dynamic topology features, they still pose challenges for the implementation of multimedia applications, such as voice, in various scenarios. The research has been conducted using a network simulator and...
Fast growth and development of software defined network (SDN) and data transmission technologies set high requirements to the quality of service (Quality of Service, QoS) of network applications, high-speed and reliable data exchange between nodes of telecommunication system with strict requirements to delays of information transmission. The exact definition of the optimal transmission route allows...
Nowadays the traditional architecture of computer networks (CN) requires big resources for support of transmission of growing data flows for large number of devices taking into account quality of service (QoS). It allows to solve a wide range of tasks on the organization of data exchange, providing development of information society. Complexity in service of CN is combined often with incomplete compatibility...
In this paper, we present experimental results on WebRTC voice quality as a function of LTE radio coverage. Different LTE radio conditions were tested by varying the radio path loss (with fast fading) in controlled test lab conditions. Voice quality was evaluated at different speech coding bit rates in terms of POLQA score and mouth-to-ear delay. Results show that, with acknowledged mode (AM) data...
Inventions in electronics and communication industries increased rapidly the utilization of wireless sensor networks, still the selection of the routing algorithm is done application wise. The existing routing protocols are having many problems and limitations in terms of Quality of Service parameters, like energy consumption is more, delay and jitter are high, throughput and packet delivery ratio...
Broadband signal transmission through communication channels in home environments is one of the interesting topics in the field of intelligent buildings. Building designers are interested in transferring multimedia content with minimum cost, energy consumption, and acceptable quality. Limitations and drawbacks of existing transmission systems such as coaxial cable, wireless transmission, etc., have...
this paper describes in details the IPTV (Internet Protocol Television) system. Also, measurement methods of the QoS parameters are analyzed, debating a practical application for evaluation of IPTV traffic parameters. QoS (Quality of Service) parameters such as IP Packet Transfer Delay (IPTD), IP Packet Delay Variation (IPDV) and packet loss Ratio (IPLR). The recent Internet is working under TCP/IP...
ITU-T H.264/MPEG-4 Scalable Video Coding (H.264/SVC) is one of popular video coding standard after H.264/MPEG-4 Advanced Video Coding (H.264/AVC) which was created by Joint Video Team (JVT) between Video Coding Expert Group (VCEG) ITU-T and Moving Picture Expert Group (MPEG) ISO/IEC. This standard allows video coding using single layer or more ones to provide the scalability of the coded video.
In the research the load balancing routing model in Time-Sensitive Networks is proposed. The novelty of the solution is a type of optimality criterion, the use of which minimizes the circuit delays. The proposed solution is compromise in terms of computational implementation as compared to the previously known models, in which the equality of the circuit delays of packets were considered as limitations,...
This paper focuses on the current state of voice over Internet protocol in wireless mesh networks. Mesh network formation is dynamic, unpredictable and self-healing. Thus, voice traffic transportation in such networks requires special care in each mesh node and in the overall mesh network infrastructure so as to prevent the voice quality from degrading, possibly to the point where voice over Internet...
A game-theoretic approach is proposed to investigate the problem of relay selection and power control with quality of service constraints in multiple-access wireless body area networks (WBANs). Each sensor node seeks a strategy that ensures the optimal energy efficiency and, at the same time, provides a guaranteed upper bound on the end-to-end packet delay and jitter. The existence of Nash equilibrium...
The paper deals with the modelling of the network effects on the quality of speech in the Voice over IP networks. The main purpose of the ideas presented here is to achieve highprecision estimation of the speech quality in the environment in which the classical approaches of speech quality determination fail. To achieve such a high precision a modular neural network model is used to map the effects...
Aiming at an efficient use of the channels available in the wireless spectrum, cognitive radio networks (CRNs) allow users to adapt to the environment by reusing the existing spectrum. A secondary (unlicensed) user (SU) is allowed to operate in the licensed band of the primary user (PU) after sensing the spectrum and making sure that it would not interfere with it. Normally, a SU transmits over spectrum...
With an increasing use of Long-Term Evolution (LTE) in mobile networks, it is necessary to evaluate its performance. In this paper, we evaluate the performance of Long Term Evolution (LTE) for mobile networks under Transmission Control Protocol (TCP) traffic. We evaluate the performance of LTE for TCP traffic for both the directions uplink as well as downlink. During the evaluations, we focus on the...
This article describes the performance evaluation of a new wireless TCP algorithm in real environments, in order to identify the advantages and disadvantages of its operation. We evaluate the proposed wireless TCP algorithm with respect to generic TCP, considering an intrusive technique by using traffic injection. These tests were performed over point-to-point WiFi and WiMAX links in out-door and...
Load balancing and delay optimizing play significant roles in improving network performance. However, in the current networks, only local load balance (LB) and mean delay optimization mechanisms are adopted, which ignore the jitter and the network's status. In this paper, a dynamic LB algorithm is proposed to optimize the network delay with a global view (LBGV). It makes a traffic distribution decision...
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