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For packet video transmission over heterogeneous networks, a novel Priority-Aware Two Rate Three Color Marker (PATRTCM) method is presented in this paper. PATRTCM introduces three marking probabilities that are calculated according to the importance of the video packet and the network conditions. A video packet is marked red, yellow or green based on the probabilities in the wired DiffServ networks,...
The both operation QoS management and monitoring for multimedia services supply are the cornerstones of convergence, towards an NGN architecture in packet switched networks, IMS as NGN control layer manage the QoS by set of Signalization plan in accordance with the specifications which makes provisioning. However, network monitoring also requires intelligence decision processes rather than calculation...
In this paper, we propose an adaptive cross layer technique that optimally enhance the QoS of wireless video transmission in an IEEE 802.11e WLAN. The optimization takes into account the unequal error protection characteristics of video streaming, the IEEE 802.11e EDCA parameters and the lossy nature of wireless channel. Our proposed technique makes use of two analytical models: a video distortion...
Recently, there is an increasing popularity of video streaming services over IP networks, e.g., IPTV, whose successes strongly depend on the video quality experienced by the end users. However, the QoE/QoSE (Quality of Experience/Quality of Service Experienced) of these services can be strongly degraded due to the packet losses during the video delivery. On the other side, to understand how packet...
The communication of video streams over wireless not only requires the stability of channel but also needs stringent QoS (quality-of-service) constraints, such as low packet loss and latency. Therefore, radio resource allocation for different traffic becomes one of the major challenges in designing a wireless multimedia network. In this paper, a priority-based cross-layer QoS scheme for wireless channel...
The Network Management System of IPv4/IPv6 based IP-3DTV is one integrating LDAP server, SNMP server, StreamMedia server and ManagementSystem server. Different from the traditional IPTV management system, a function designed for the management of 3DTV has been added to all of the servers in IP-3DTV. Moreover, SNMP network management technology, together with LDAP directory access technology, provides...
A new cross layer path selection scheme with quality of service (QoS) support along urban areas is proposed. First, we introduce a cross-layer approach where the routing decision takes explicit consideration of the application layer objective function. Second, the queueing based mobility model, spatial traffic distribution and probability of connectivity for sparse and dense Vehicular Ad-Hoc Networks...
Internet-based video streaming applications is becoming more and more popular and attract millions of online viewers every day. The incredible growth of viewers, dynamics of participants, and high video quality-of-service (QoS) requirement pose scalability, availability and low-latency challenges to peer-to-peer (P2P) live video streaming systems. Tree-based systems have low-delay but are vulnerable...
It is not easy to achieve real-time video transmission testbed on WiMax, due to the lack availability of WiMax networks. This paper presents a ns-2 based emulator to evaluate the quality of multicast video services transmitted over an IEEE 802.16 wireless network. The impact of the modulation schemes and the cyclic prefix, on the throughput and video quality were discussed and the performance of the...
With the development of innovative network infrastructure and increasing bandwidth availability, live video streaming is emerging as an attractive application for end users and the industry. Due to the heterogeneity in user resources as well as bandwidth fluctuations, we argue that, to provide high quality-of-service, it is desirable to tailor (on-the-fly) the bit rate of video streams, according...
In this paper, we present a dynamic caching and replacing mechanism for the multiple videos over quality of service networks. The metafile containing the metadata about the video is maintained for caching and replacing mechanism. The caching algorithm employs the sliding window method to select the frame that has to be cached. The sliding window mechanism uses the beneficial value which is calculated...
P2P streaming has attracted much attention recently with promises for higher revenues and better load distribution. Still, the majority of P2P video streaming systems today employ the one-size-fits-all concept where the same video bit-rate is offered to all users. Here the promising H.264/Scalable Video Coding (SVC) standard is seen as a necessity in not only supporting heterogeneous resources, but...
With the presentation of more reliable groupcast proposal for IEEE802.11 WLAN, the QoS of video transmission based on groupcast (multicast / broadcast) is improved. To adapt the network load and bandwidth dynamic change in WLAN environment, we design a flexible optimization mechanism that integrates video steam priority character with more reliable groupcast technology. Simulation validates it is...
Concerning video transmission on the Internet, we present a model for estimating the subjective quality from objective measurements at the transmission receivers and on the network. The model reflects the quality degradation subject to parameters like packet loss ratio and bit rate and is calibrated using the results from subjective quality assessments. Besides the model and the calibration, the main...
This paper proposed an adaptive scheduling algorithm for real-time video streams in wireless local area networks (WLAN). The first job is how to reduce the amount of the video data that must be transmitted on the wireless channel. The second job is how to scheduling the video streams at the access point (AP) and achieving the best overall quality of service (QoS). For the first job, we will compare...
This paper proposes a method of customizing interactive audiovisual communication services over bandwidth guaranteed IP networks typified by NGN in order to maximize QoE(Quality of Experience) on an individual users' basis. The method is based upon an extension of a QoE guarantee architecture GPSQ (Guarantee of Psychologically Scaled Quality), which the authors proposed previously. GPSQ extended for...
The transmission of stream media over the Internet require a high bandwidth. While the best-effort network could not provide constant transmission speed. The proxy server (PS) is the nearest part of the Internet to the client. The proxy can cache the data, and release the load of the servers. So the proxies have great influence on the video QoS. Through the perfect algorithm, within the acceptable...
Recent advances in wireless communications technology and low-power, low-cost CMOS imaging sensors enable a new sensing modality employing ubiquitous distributed video sensing. In many video sensing applications multimedia streams are often required by the base station to provide detailed information of the target spot in the sensor field. However, limited bandwidth, unstable network environment,...
One-Way Delay Variation (OWDV) has become increasingly of interest to evaluate network state and service quality, especially for real-time and streaming services such as VoIP and video. Measurement of these parameters needs to be performed with the layout infrastructure. Many schemes for OWD measurements require clock synchronization at the source and destination through Global-Positioning System...
Development of network monitoring tools for realtime rich-media (RTRM) applications remains a challenge for both academic and industrial researchers as the complexity of the computational processing varies dynamically. We propose a novel, flexible and cost effective technique which can be implemented in ordinary network environment to monitor QoS parameters such as packet-delay, packet-loss, packet...
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