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.
In this paper we present an energy efficient priority based MAC protocol for Wireless Sensor Networks (WSNs). We abbreviate it as PRIMA. The PRIMA protocol consists of two phases; a clustering phase and a channel access phase. Clustering the senor network makes the MAC protocol to handle well network scalability issues. The channel access is composed of a hybrid mode of TDMA and CSMA. CSMA mode is...
In this paper, we focus on the simulation element of a hybrid client-server and authority-driven peer-to-peer MMOG framework currently in development, created in Java and utilising the ns-3 network simulator through a native interface, with some discussion of the overall framework. The framework is intended eventually for use in the development of networked multiplayer games and will aid in respecting...
With recent advances in video encoding and network technology, media streaming services are getting popular. Media streaming system based on the traditional server/client or CDN architecture has a scalability problem, and peer-to-peer media streaming system using resources of peers in the system can provide better scalability. Previous media streaming services are suited to play stored contents such...
In the large scale multimedia interactive applications over the Internet, data can be categorized into the streaming data (e.g. the audio and the video streaming) and the sporadic data (e.g. the annotation in a whiteboard). The mesh-pull overlay fits for the streaming data, for it is resilient in heterogeneous network, while the tree-push overlay is more suitable for the sporadic data, for its easy-to-manage...
Many real-time systems use preemptive priorities in their internals to guarantee certain real-time performance. This includes technologies that range from RTSJ (The Real-Time Specification for Java) to middleware like Real-Time CORBA (Common Object Request Broker Architecture) which offers additional models and policies that blend client and server information. This decision makes easier the integration...
Recent advances in the development of wireless sensor networks(WSNs) have considerably increased the interest in their applications for a wide range of problems such as environmental monitoring, target tracking, habitat monitoring etc. Many of these applications and the wireless sensor network(WSN) itself require that the clocks of the sensor nodes are synchronized with certain accuracy. Existing...
This paper presents a MAC layer protocol, called RTMAC, for real-time data streaming in wireless sensor networks. RT-MAC eliminates need to contend for a wireless medium by potential transmitting nodes in a range by introducing feedback control packet, called Clear Channel (CC). RT-MAC maximizes spatial channel reuse by avoiding false blocking problem of RTS/CTS exchange based wireless MAC protocols...
Current implementations of real-time collaborative applications rely on a dedicated infrastructure to carry out all synchronizing and communication functions, and require all end nodes to communicate directly with and through the central server. In this paper, we investigate an architecture, in which the most resource intensive functionality of continuous communication among collaborators to disseminate...
The Precision Time Protocol (PTP) is an application layer protocol and therefore destined to be implemented in software. Hardware functions, if present, include a high resolution clock that helps to generate precise timestamps for PTP messages. The presented paper describes an IEEE 1588 clock that realizes syntonization and synchronization functions completely in hardware. It combines a three-port...
The technology supporting multiplayer online games (MOGs) has greatly improved in the past few years. This represents great news both for players all over the world and for researchers that are struggling behind tough problems in real-time distributed systems. Indeed, MOGs represent a peculiar class of distributed systems, sharing features, requirements, challenges, and thereby also feasible solutions...
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.