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Nowadays, people usually connect to the Internet through a multitude of different devices. Video streaming takes the lion’s share of the bandwidth, and represents the real challenge for the service providers and for the research community. At the same time, most of the connections come from indoor, where Wi-Fi already experiences congestion and coverage holes, directly translating into a poor experience...
A "keywords cloud" learning interest/difficult reminding system based on learners' video watching logs and subtitles is proposed for promoting self-paced MOOC learning. By identifying the hot video segments (via video seek event counts) and weighting the keywords of hot video segments, we are able to establish the "keywords cloud" of each learning topic. This feature is valuable...
In this paper, TA-ARQ (Time-constrained Aggregated Automatic Repeat-reQuest) with an adaptive rate control for SVC streaming based on HDP transport protocol is proposed. To meet the requirement of terminal equipment in the heterogeneous network environments, we consider SVC for different applications. Selected NALUs (Network Abstraction Layer Units) are sent according to the quality estimation of...
Quality of Service (QoS) is considered as the standard check of a conveyance system to show provided services and its availability. For illustration application like video conferencing, voice over ip (VOIP), streaming videos, real time operation feel necessity for draconian assurance on jitter, packet loss, prioritization of services and end-to-end delay. So to overcome these issues a novel scheme...
We propose an active buffer management scheme to guarantee quality of service (QoS) for video streaming services in wireless local area network (WLAN). The proposed scheme uses the concept of virtual transmission delay and differentiates the frame drop policy according to the type of video frame. The virtual transmission delay is defined as the delay until the video frame is potentially transmitted...
There are obvious differences between video and data frame transmission in WLAN, for the video streams need to provide people with consequent and distinct scene. Thus we should concern with the transmission delay and throughput for the video frame. In transmission, the long video frame would be segmented, and then fill into the SDU. Different frame rate and size lead to different MAC layer transmission...
Power management is a critical issue for mobile devices, where a significant portion of the total system energy can be often consumed by heavy wireless network activity. In this paper we present a framework that reduces the energy consumption of wireless mobile devices during streaming video content over Wireless LAN networks by utilizing the power saving mechanisms defined in the IEEE 802.11e standard...
When a mobile host transmitting real-time video traffic using DCCP CCID3 moves between two wireless LAN access points with different congestion situations, it is difficult to quickly change the transmission rate according to the changes of communication environment because controlling the sending rate depends on feedback information. To solve this problem, we recently proposed a predictive rate control...
In this paper, a module has been presented which can perform a seamless interoperation between Bluetooth and Wi-Fi interfaces. The work is really challenging to achieve as both the interfaces work in the frequency band of 2.4 GHz creating a high possibility of interference. The challenge of implementing such an interoperable application atop OSGi framework has been discussed in this paper as well...
Mobility support in IPv6 networks (MIPv6) and Fast Handovers for Mobile IPv6 (FMIPv6) are already released as RFCs for many years. While the former focuses on maintaining the network connections when a mobile node handovers across subnets, the latter is built based on the former concept, but focuses on reducing the packet loss and latency inherent to the handover process. Performance study of both...
Urban facility interconnection networks require a robustness and reliability usually found in public networks or private cable and radio networks in licensed bands. Both factors mean an increase in costs, which also increase as the size of the network increases. The recent rise in use of wireless technologies in open wavebands has attracted the interest of the industry in the spread of these types...
In the recent years, Voice over Internet Protocol (VoIP) is the most popular technology and becomes a kind of killer application, and 802.11-based wireless Local Area network (WLAN) has been set up in many public places. People who use VoIP over WLAN can be more convenient. In the common WLANs, IEEE 802.11e WLAN can support VoIP with better Quality of Service (QoS), However, 802.11 lacks a flexible...
Due to huge popularity of portable terminals based on Wireless LANs and increasing demand for multimedia services from these terminals, the earlier structures and protocols are insufficient to cover the requirements of emerging networks and communications. Most research in this field is tailored to find more efficient ways to optimize the quality of wireless LAN regarding the requirements of multimedia...
Wireless networks such as WiFi suffer communication performance issues in addition to those seen on wired networks due to the characteristics of the radio communication channel used by their Physical Layers (PHY). Understanding these issues is a complex but necessary task given the importance of wireless networks for the transfer of wide ranging packet steams including video as well as traditional...
Wireless real-time video transmission system is widely adopted in many fields. In this paper, an embedded Linux system platform is built. The platform is based upon i.mx27 with inner ASIC video codec. We transplant embedded Linux kernel and transmission protocol stack to support application interfaces. In order to ensure the real-time property, we use hardware video encoder, optimize MPEG-4 codec...
The deployment of real-time and multimedia applications over wireless LAN has gained a growing interest in this last decade. These applications, e.g. video streaming, require tight guarantee on quality of service (QoS). Also, they use multicast communication in order to reduce the bandwidth consumption. However, in WLAN, multicast packets are sent with the basic rate (lowest rate); which results in...
This paper presents the development of FTMK online collaboration system via wireless LAN (AFOS) prototype. The system will allow the UTeM FTMK's lecturers to communicate through the conference system. There are two modules included in the system which are video and audio configuration module and private chat module. AFOS will allow the users in two or more locations to interact via two way video and...
The Internet Protocol Stack provides a set of transport layer protocols. There are two dominant types of transport layer protocol used in the Internet: UDP (User Datagram Protocol) and TCP (Transmission Control Protocol). The transport layer provides end-to-end information transfer across a network with the quality of service needed by the application. In this paper, we provide a performance comparison...
The Internet protocol stack provides a set of transport layer protocols. There are two dominant types of transport layer protocol used in the Internet: UDP (user datagram protocol) and TCP (transmission control protocol). The transport layer provides end-to-end information transfer across a network with the quality of service needed by the application. In this paper, we provide a performance comparison...
Initially, IEEE 802.11 standard was not designed for multihop networks, but its market success gave it a powerful incentive, and nowadays IEEE 802.11 Working Group is preparing various amendments and looking for new application scenarios to ensure future success in the market. In this paper, we analyze the performance of an IEEE 802.11s mesh network and show that the effect of starvation caused by...
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