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1مؤتمر
المؤلفون: Goran, N., Hadzialic, M., Begovic, A.
المصدر: 2013 36th International Convention on Information and Communication Technology, Electronics and Microelectronics (MIPRO) Information & Communication Technology Electronics & Microelectronics (MIPRO), 2013 36th International Convention on. :380-383 May, 2013
Relation: 2013 36th International Convention on Information and Communication Technology, Electronics and Microelectronics (MIPRO)
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المؤلفون: Shan Gao, Yicong Zhou, Jiarun Song, Fuzheng Yang
المصدر: IEEE Transactions on Multimedia. 19:1015-1029
مصطلحات موضوعية: Computer science, business.industry, Real-time computing, 020206 networking & telecommunications, IPTV, 02 engineering and technology, Video quality, Computer Science Applications, Rate–distortion optimization, Packet loss, Distortion, Signal Processing, 0202 electrical engineering, electronic engineering, information engineering, Media Technology, 020201 artificial intelligence & image processing, Electrical and Electronic Engineering, business, Bitstream, Media Delivery Index, Computer network, Parametric statistics, Communication channel
الوصف: Parametric planning models are designed for estimating the video quality, which can be applied to effective planning, implementation, and management of network video applications and communication networks. However, different from the bitstream-based evaluation models, the planning models are not allowed to exploit the video streams, with only limited information available for use, i.e., a few general parameters predetermined by the service providers and network operators. In this paper, a parametric planning model combining channel and video characteristics is proposed to estimate the video distortion caused by packet loss for Internet protocol television (IPTV) services. More specifically, the probability distribution of the channel states is determined by detailed analysis of the channel characteristics. Then, considering the influence of burst packet loss and the temporal dependence between frames, several sequence-level and frame-level parameters for video quality evaluation are derived from the perspective of the probability distribution of the channel states. Utilizing these parameters, the proposed model approximates the video quality considering the effects of direct packet loss and error propagation. Experimental results show that the proposed model has a superior performance for video quality estimation than the three commonly used parametric planning models.
URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_________::3856b30b35b86eacf396c13e7e21bb21
https://doi.org/10.1109/tmm.2016.2638621
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المؤلفون: Hegazi M. Ibrahim, Mohamed A. Mohamed, Muhammad Zubair
المصدر: Wireless Personal Communications. 96:1711-1740
مصطلحات موضوعية: business.industry, Network packet, Computer science, Quality of service, ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS, Real-time computing, Smart antenna, 020206 networking & telecommunications, IPTV, Throughput, 010103 numerical & computational mathematics, 02 engineering and technology, 01 natural sciences, WiMAX, Computer Science Applications, law.invention, law, Internet Protocol, 0202 electrical engineering, electronic engineering, information engineering, Bandwidth (computing), 0101 mathematics, Electrical and Electronic Engineering, business, Media Delivery Index, Computer network
الوصف: Owing to the inherent nature, data packets in internet protocol television (IPTV) systems face two major challenges; loss and delay. On the other hand, there is a stringent constraint of minimum speed to make possible delivery of the right number of frames per second to deliver multimedia content in mobile environment. This implies that the inadequate connection speed and bandwidth available for large IPTV customer base can trim down the service quality delivered. In this paper, we have thoroughly investigated the impact of various factors which affect the key quality parameters in IPTV systems which employs worldwide interoperable microwave access WiMAX. Also, we have proposed to employ smart antenna for WiMAX network. Specifically, we have carried out a detailed study of the effect of the following parameters: (1) transmission power; (2) distance variation; (3) antenna gain; (4) channel bandwidth, and (5) mobility under six different categories of scenarios (1) variable distance between nodes; (2) various modulation techniques; (3) variable transmitted power; (4) variable coverage area; (5) different types of antennas, and (6) variable number of connection. The simulation results showed that WiMAX makes a great development in the proposed IPTV system, while ensuring that packet delay and jitter meet the requirements of video content streaming to access IPTV services anywhere and anytime under the effect of changing power ratings, modulation techniques, and distance through WiMAX coverage area. Therefore, the proposed system satisfies higher throughput rates and solves delay problems; as well as providing a stable and monotonic response for all discussed QoS parameters.
URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_________::02e22c9a84d9a224c24248364a6a99de
https://doi.org/10.1007/s11277-017-4264-6 -
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المؤلفون: Karim Hammad, Abdallah Shami, Abdallah Moubayed, Serguei Primak
المصدر: IEEE Wireless Communications Letters. 5:564-567
مصطلحات موضوعية: Queueing theory, Queue management system, business.industry, Computer science, Network packet, Quality of service, ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS, Real-time computing, 020206 networking & telecommunications, 02 engineering and technology, Scheduling (computing), Control and Systems Engineering, 0202 electrical engineering, electronic engineering, information engineering, Queuing delay, 020201 artificial intelligence & image processing, Electrical and Electronic Engineering, business, Media Delivery Index, Computer network, Jitter
الوصف: Delay jitter of data packets is known to be a crucial quality of service measure especially for real-time applications (e.g., VoIP). It takes place as a result of the queuing, scheduling, and routing latencies within the network. However, control schemes that directly tackle the jitter problem in today’s advanced wireless systems are rare. To enable such schemes, proper modeling of the packet delay jitter is an essential preliminary step. This letter presents a comprehensive mathematical modeling for the packet delay jitter in a simple queuing system with one traffic buffer of infinite length, one server, and single hop. In contrast to independent and identically distributed models, our analysis focuses on the correlated nature of service intervals. The presented models study different scenarios and parameters for the queue in terms of the system’s utilization and the probability distribution of data packets’ service and interarrival times, respectively. Numerical simulations demonstrate the high accuracy achieved by the presented models.
URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_________::0533611c20d5669e17f514ee5bb17d41
https://doi.org/10.1109/lwc.2016.2601609
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المؤلفون: Lamia Chaari Fourati, Wessam Ajib, Olfa Ben Rhaiem
المصدر: Computer Networks. 103:84-100
مصطلحات موضوعية: Multicast, Computer Networks and Communications, business.industry, Computer science, Network packet, Quality of service, Node (networking), ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS, 020206 networking & telecommunications, Throughput, 02 engineering and technology, Mobile ad hoc network, Scalable Video Coding, Linear network coding, 0202 electrical engineering, electronic engineering, information engineering, Codec, 020201 artificial intelligence & image processing, business, Media Delivery Index, Computer network
الوصف: Video streaming over mobile ad-hoc networks is becoming a highly important application for reliably delivering the content between the user and the content storage node. The key challenge is, hence, to address the impact of the user mobility on the quality of the delivered video. Accordingly, the pioneering concept of network coding (NC) emerges as a promising approach for improving the video transmission quality mainly in multicast mobile environment. This work focuses on improving the Quality of Service of video streaming over mobile ad-hoc networks using random NC. We consider video coded by the widely-used H264/SVC codec that generates packets with different priorities and provides traffic differentiation using the IEEE 802.11e MAC. Intuitively, focusing on lowering the error transmission of high priority packets leads to enhance the video streaming quality. Accordingly, this work develops and proposes a new scalable transmission scheme that decreases the loss of high priority packets. Our approach, named Extended Multicast Scalable Video Transmission using Classification-Scheduling Algorithms and Network Coding over MANET (and denoted EMSCNC), adopts a cross layer design between the H.264/SVC codec, the network and MAC layers. Moreover, we develop an analytical framework allowing the performance evaluation in terms of throughput, delay, and packet delivery ratio. Simulation results validate our analytical model and confirm the substantial performance improvement brought by our approach.
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المؤلفون: Satish Chand
المصدر: Journal of Information and Optimization Sciences. 37:389-404
مصطلحات موضوعية: 020203 distributed computing, Uniform distribution (continuous), Computer science, business.industry, Video server, Probability density function, 02 engineering and technology, Multiplexing, 0202 electrical engineering, electronic engineering, information engineering, business, Random variable, Media Delivery Index, Communication channel, Jitter, Computer network
الوصف: In this paper, we propose a model for estimating the buffer storage for continuous delivery of video data. For this, the physical channel is divided into logical channels and the videos running on the video server into segments. The video segments are transmitted through logical channels using the time-division multiplexing (TDM) technique. Switching between two consecutive video segments in a logical channel creates some delay during which no data is transmitted and that delay, called jitter delay, is of random nature. In this work, jitter delay is incorporated while estimating the buffer storage. The buffer storage is a random variable and its probability density function is derived. This study is important for applications related to on-demand services such as cable TV, news-on-demand, movie-ondemand, audio-on-demand, etc.
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المؤلفون: Chong-Yi Yang, Chih-Heng Ke, Jiann-Liang Chen
المصدر: Mobile Networks and Applications. 22:30-39
مصطلحات موضوعية: Computer Networks and Communications, business.industry, Computer science, Wireless network, Network packet, ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS, Real-time computing, 020206 networking & telecommunications, 02 engineering and technology, computer.file_format, Out-of-order delivery, Hardware and Architecture, MPEG-4, 0202 electrical engineering, electronic engineering, information engineering, Wireless, 020201 artificial intelligence & image processing, IEEE 802.11e-2005, business, computer, Software, Media Delivery Index, Group of pictures, Information Systems, Computer network
الوصف: In this study, we develop a hierarchical packet pre-dropping (HPPD) approach that exploits different methods to process intra-coded (I)/predictive-coded (P)/bidirectionally predictive-coded (B) video frame packets to improve the video transmission quality in heavily loaded IEEE 802.11e wireless local area networks (WLANs). It is not easy to transmit packets in WLANs with a heavy traffic load. Efficient transmission of video packets is important for improving the quality of video transmission. If the network becomes congested, important packets may be dropped. Further, video packets tend to be affected considerably more than data packets. Therefore, controlling the traffic of insignificant packets to avoid the transmission of useless data can improve the quality of video transmission. On the basis of this concept, in this paper, we propose a strategy that is different from the approaches proposed in earlier studies. First, identification of the dependence of video frames in a group of pictures (GOP) can prevent the transmission of useless data. Thus, the transmission channel resources are economized by avoiding the transmission of undecodable video frames. Second, in heavily loaded WLANs, it is not sufficient to utilize the queues to transmit important video frame packets. HPPD adopts the method of an aggressive drop of unimportant packets to retain the transmission channel resources for important video packets. Experiments have demonstrated that in heavily loaded WLANs, the Peak Signal to Noise Ratio (PSNR) for the case when the HPPD mechanism is adopted is better than that when enhanced distributed channel access (EDCA), adaptive mapping, or a novel mapping mechanism is used.
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المؤلفون: P. P. Joby, M. Lavanya, C. Lincy Magdaline
المصدر: International Journal of Computer Applications. 137:15-18
مصطلحات موضوعية: Computer science, Network packet, business.industry, Link Control Protocol, Retransmission, ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS, 020206 networking & telecommunications, 020302 automobile design & engineering, 02 engineering and technology, Out-of-order delivery, Base station, 0203 mechanical engineering, Packet loss, Linear network coding, 0202 electrical engineering, electronic engineering, information engineering, Cellular network, business, Anti-replay, Media Delivery Index, Computer network
الوصف: a track of the nodes through which the packets are sent, the retransmission of packets within the network can be avoided. A new protocol called the MARK-TIME protocol is introduced to track the information and store it in common at the base station of the network. The distance of the node in the network is calculated along with the path, is used to transmit the message packets within the network. The detail of the packets and the path along which the data is transmitted is stored in the proxy server at the base station. In the case of delay or loss in communication, due to mobility of nodes in the network, it leads to loss of the receiving packets in the receiver (sink node). It sends a message to the proxy server, which tracks the node and provides efficient transmission without duplication of packets within the mobile network.
URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_________::37d99c0cc5986bcdfbadd8a54a8dfad7
https://doi.org/10.5120/ijca2016908905 -
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المؤلفون: Hadhami Dbira, Brunilde Sansò, André Girard
المصدر: Annals of Telecommunications. 71:223-237
مصطلحات موضوعية: Network packet, Computer science, computer.internet_protocol, Quality of service, End-to-end delay, Real-time computing, 020206 networking & telecommunications, 02 engineering and technology, Internet protocol suite, 0202 electrical engineering, electronic engineering, information engineering, 020201 artificial intelligence & image processing, Electrical and Electronic Engineering, Packet delay variation, computer, Algorithm, Dimensioning, Media Delivery Index, Jitter
الوصف: The packet delay variation, commonly called delay jitter, is an important quality of service parameter in IP networks especially for real-time applications. In this paper, we propose the exact and approximate models to compute the jitter for some non-Poisson FCFS queues with a single flow that are important for recent IP network. We show that the approximate models are sufficiently accurate for design purposes. We also show that these models can be computed sufficiently fast to be usable within some iterative procedure, e.g., for dimensioning a playback buffer or for flow assignment in a network.
URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_________::24795823088e1e18452fc1990e0faf76
https://doi.org/10.1007/s12243-016-0492-0 -
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المؤلفون: Biswanath Mukherjee, Abu Reaz, Daisuke Murayama, Ken-Ichi Suzuki, Naoto Yoshimoto, Glen Kramer, Partha Bhaumik
المصدر: Optical Switching and Networking. 18:180-190
مصطلحات موضوعية: Access network, Computer Networks and Communications, Network packet, business.industry, Computer science, Quality of service, Real-time computing, IPTV, law.invention, law, Internet Protocol, Electrical and Electronic Engineering, business, Media Delivery Index, Data compression, Jitter, Computer network
الوصف: In an increasingly content-centric world where users consume large amounts of multimedia content, video delivery platforms over packet networks, such as Internet Protocol Television (IPTV), are gaining rapid popularity. At the same time, to serve the ever-increasing bandwidth demand from users, access networks, traditionally the bottleneck for high-bandwidth applications, are also undergoing rapid evolution. Forecasting how streaming IPTV over a network will perform is challenging as the data rate of a video stream varies with scene, time, framerate, and encoding. Nevertheless, it is important to evaluate the performance of an access network for IPTV traffic to ensure good Quality of Service (QoS) for users. Using video traces for such evaluation requires multiple video traces to represent different scenarios and generally involves slow I/O-based operations, such as file reading. To overcome these limitations, in this paper, we explore several aspects of modeling IPTV streaming, and present a synthetic video trace generator that closely resembles the empirical IPTV traces. Our analysis confirms that our synthetic video trace follows the statistical properties of empirical videos, and its resultant data rate is representative of the IPTV video streaming. Next we study the performance of Ethernet Passive Optical Network (EPON) in streaming IPTV by using the generated synthetic trace. Parameters of interest are the number of parallel video streams supported, the effects of the degree of video compression, average and maximum packet delays, and packet delay variances (jitter). It is shown that 10G-EPON can support a large number of parallel IPTV channels at moderate rates of video compression.
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