The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper describes a scheme for providing mobile multimedia applications, distributed in a Wireless Local Area Network (WLAN), with seamless communications. Specifically, when multiple WLAN access points are available, the scheme enables a mobile node to select dynamically the access point to connect with, based on a combination of measured parameters such as signal strength, transmission rate,...
With the constant development of multimedia technologies and mobile devices, the demand of transmitting multimedia streams to mobile devices will be one of the major applications in wireless networks. However, IEEE 802.11 does not support reliable multicast due to its inability to exchange ACKs with multiple recipients and the influence of signal interference, congestion and hidden terminal problems...
The UDP transport protocol has been fore selected for the most of multimedia traffic transport on mobile wireless networks. Nevertheless, it exhibits some problems related to bandwidth sharing between several traffic sources, as well as TCP friendliness with established TCP connections on the network. In this paper, we propose a combined mechanism, the PRDR: proportional and derivative algorithm for...
The move towards an increasingly heterogeneous infrastructure has been one of the directions followed by most mobile operators in recent years. Here, one of the problems still waiting for a solution is how to enable multi-mode mobile terminals to freely roam between the different wireless systems used by the network operator for providing access to its users. The IEEE 802.21 is just one of the standardization...
Multimedia applications can be offered to mobile users on the IEEE 802.11 WLAN, if their bandwidth, delay and jitter requirements are met, even in the presence of handoffs. Applications such as VoIP require a delay of less than 150 msecs and packet loss less than 3%. Studies have shown that the latencies achieved by existing handoff implementations can exceed 200 ms and packet loss can exceed 10%...
Multimedia Information delivery in public transportation systems is gaining increasing prominence. This paper proposes mesh-tree architecture for low latency and high-throughput data transfer to mobile vehicles along approach roads in and around a bus station. Prior works have demonstrated 802.11b-based wireless chain topology for mobile vehicle connectivity along railroads. However, the chain topology...
This paper focuses on optimizing real-time intervehicle video communications from an image analysis perspective. Differently from traditional multimedia communication schemes which are typically optimized to maximize perceptual quality as perceived by human users, in this work we propose a new packet importance estimation method designed to capture the contribution of each packet to the performance...
This contribution addresses the case when live packet-switched video is used to enrich circuit-switched speech calls in mobile telephony. Circuit-switched and packet-switched transmissions generally operate on completely different transmission paths resulting in different QoS in terms of delay and loss rates. In this case, video and audio data recorded at the same time are not multiplexed together...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.