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The mobility and flexible configuration features of mobile multimedia systems make it an important mean for power system communication. Especially, the mobile video conference can acquire the important on-the-spot information rapidly, and can bring great convenience for power production. This paper analyzed the next-generation broadband wireless communications technology such as 3G, 4G, and video...
Improving the interaction experience between humans and computers is a major research challenge and one of the most promising new modes of Human Computer Interaction (HCI) is via haptic devices which provide users with the sense of touch while interacting with computer systems. Two or more users may interact with each other and exchange the sense of touch by using Distributed Haptic Virtual Environments...
The IP Multimedia Subsystem (IMS) has been considered to be exclusive to big players of the telecommunication world. Session Initiation Protocol (SIP) has been standardized by IETF and solutions based on it have been in the market at least for a decade. It is also an essential part of the IMS, as it is the control protocol of IMS. Recent development of the Linux platform and the Open source IMS system...
Peer to peer based live multimedia streaming systems over the Internet have been gaining popularity these days because they can be easily deployed without router based IP multicast capabilities. However, the peers frequently join and leave the system so that some peers may experience service disruptions, which degrade the overall quality and reputation of the services. In this situation, a hybrid...
Recently it has been shown that network coding can highly improve the network throughput in the communication systems and specifically increase the downloading performance in P2P networks. This paper presents a new live streaming system for GIA-based P2P networks. In the proposed system the traditional GIA protocol is improved for an efficient use in multimedia applications. We introduce a new mesh-pull...
Recent advances in high-speed wireless LANs with physical layer (PHY) rates reaching 600Mbps make them ideal for multimedia applications. It has been shown that efficiency at medium access control (MAC) layer decreases with increasing the PHY rate. To achieve high efficiency, few researches have tried to use aggregation in which few packets are concatenated into a larger frame. The resultant frame...
Different applications in the network have different sensitivity for the certain QoS parameters. The existing mechanisms cannot modify the packet loss policy exactly according to the needs of QoS parameters. Therefore, the network will not maximize its overall efficiency. This paper proposes a novel cognitive approach for QoS. It classifies the applications by various combinations of the QoS parameters...
Quality-of-service (QoS)-guaranteed traffic is of critical importance in real-time multimedia communications. In this paper, a novel approach to systematic cross-layer monitoring, learning, and optimization using artificial neural networks is developed for wireless links with QoS-guaranteed traffic. The proposed method is used to jointly optimize the design parameters of the adaptive modulation and...
Recently, there has been increasing demand for video streams with high perceptual quality. The capability of present day Internet links in delivering high perceptual quality streaming services, however, is not completely understood. This paper presents a trace driven study to understand QoE capabilities of present day Internet links using 51 diverse ISPs with a major presence in US, Europe and Asia-Pacific...
Multimedia service is a fundamental requirement in the Wireless Broadband Access (WBA) network. It is a challenge for service operators to provide the low-latency applications, such as voice service, due to the limited wireless bandwidth resource. Although it has been carried out in wireless mobile 3G/3.5G networks, the user experience of Internet surfing is not satisfied. The mobile WiMAX 4G technology,...
The Next Generation Networks (NGNs) were proposed to provide ubiquitous access to multimedia services over the Internet. With the best effort nature of the Internet, the quality of real time multimedia services such as voice and video can rapidly degrade due to network impairments. In this paper, we propose a novel feedback-free Early VoIP Quality Adaptation Scheme (EVQAS) which can adapt voice send...
We propose a distributed quality of service (QoS)-aware MAC protocol for multi-channel cognitive radio networks supporting multimedia applications. Specifically, based on the channel usage patterns of primary users (PUs), secondary users (SUs) determine a set of channels for channel sensing and data transmissions to satisfy their QoS requirements. We further enhance the QoS provisioning of the proposed...
The presence service provides event-based notifications of the status of contacts. Currently duplicate notifications must be sent directly to a set of watchers in unicast messages, putting unneeded strain on outgoing network links of the source node. In this article, we propose an extension to the Session Initiation Protocol (SIP) to distribute notifications through a tree of watchers using network...
Signaling control schemes for wireless multimedia services are expected to maximize the number of newly-accepted mobile terminals (MTs), i.e., system throughput, while maintaining the quality of service (QoS) requirements for the existing MTs in the system. In this paper, we propose a γ-percent time-bound signaling control (γ-TBSC) scheme that resolves a maximum number of MTs mostly within a given...
Deployment of video communication services over mobile ad hoc networks faces numerical obstacles since the networks are characterized by limited and unpredictable bandwidth. Following the tenet of service-orientation, this study proposes a cross-layer design for fine-grained adaptive transmission of real-time video over time-varying channels. Specifically, the sender accurately estimates the current...
Providing wireless service without spatial restriction has been realized due to rapid growth of IEEE 802.11 based wireless technologies. Recently, available bandwidth ("AB") estimation of the wireless medium has received much attention with the widespread use of real-time multimedia applications which requires certain level of QoS (Quality of Service) guarantees. In this paper, we propose...
3rd party content service expands the variety of contents that IPTV usually distributes and opens the opportunity to create new and attractive content to anyone. However, the hosting service for 3rd party content demands high cost. Therefore, IPTV provider needs an effective strategy of resource management to minimize the cost. Thereby, the cost function is based on the IPTV management of content...
The recent trend in Internet traffic indicates the proliferation of usage of multimedia services where a substantial part is related to some sort of video transmission. Moreover, an increasing number of Internet users employ wireless access technologies. High-quality video streaming over wireless access in unison with great mobility brings challenges to sustain the mobile user perceived video quality...
As an emerging networking technology, cognitive radio networks (CRNs) have drawn immense attention in the wireless networking community. Since multimedia services have become widely popular among wireless communication services users, supporting those services over CRNs has become an interesting research topic in recent years. However, due to the random nature of the resource availability in CRNs,...
In the few last years, there is an increasing need of QoS guarantees for multimedia and real time applications in mobile ad hoc networks. While several QoS routing protocols were proposed, adaptive routing has not be enough exploited. We propose in this paper a new delay oriented adaptive routing protocol for mobile ad hoc networks. We integrate a mean delay estimation model at each node in our protocol...
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