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CBTC (Communication Based Train Control) will be based on mobile communication, which the key problem is how to support reliability of control data transmission to improve track utilization and enhance train safety. This paper proposed a kind of real-time transmission model for high speed train end-to-end control data operation, which based on circuit switched data service by traditional wireless...
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...
Industrial wireless WIA-PA is the industrial wireless networking standard which is an emerging and used for process control. Real-time and reliable communication is the most important technical features of industrial wireless network. In this paper, through the analysis of the wireless network for industrial control and network architecture and protocols, combined with industrial wireless networks,...
To improve communication reliability and protocols'portability on the nodes of wireless sensor network and ease the development difficulty, a new system design scheme based on the embedded operating system μC/OS-II is proposed in this paper. According to operating system modular design strategy, the way of task partitioning for network protocol stack is present and the operating system is transplanted...
Aiming at embedded system's requirement of the wireless network application, this paper proposes a simple, reliable and practical transmission protocol. The protocol reserves all functions and high-efficiency character of UDP and realizes real-time and reliable transmission with reliable process flow, batch retransmit mechanism. Experiments showed that the proposed protocol could achieve high reliable...
Network-based real-time computing applications which require tightly bounded end-to-end delays have been increasing at a steady rate in recent years. A messaging layer that yields tight bounds on the latencies in detecting message losses and enables the application layer to initiate a timely recovery action has thus become highly desirable. In this paper we present a new reliable real-time messaging...
In this paper, a video streaming system for education based on wireless mesh network is proposed. Wireless mesh network is a self-organizing, self-managing and reliable intelligent network which allows educators to deploy a network quickly whenever there is a need. Video streaming plays an important role in this system for multimedia data transmission. This new system adopts the scalable video coding...
UDT is an application level, end-to-end, unicast, reliable, connection-oriented streaming data transfer protocol. The UDT protocol is completely at user space above UDP. For it bases on the implementation of UDP, so its real-time characteristic performs very well. In the user space, by designing a new congestion control algorithm, also a new mechanism dealing with the packet loss, UDT has enhanced...
High reliability and real-time performance is a must in the industrial control networks. This article discussed both advantages and disadvantages of traditional fieldbus, then the open standard Ethernet technology was introduced. By discussing the disadvantage of applying commercial Ethernet to industrial control networks, this article analyzed two methods to improve the reliability and real-time...
Embedded wireless networks have largely focused on open loop sensing and monitoring. To address actuation in closed loop wireless control systems there is a strong need to re-think the communication architectures and protocols for reliability, coordination and control. As the links, nodes and topology of wireless systems are inherently unreliable, such time-critical and safety-critical applications...
There are two states in event-driven wireless sensor network, one is non-event state, and the other is event state. In non-event state, the network traffic is very small and the requirement for real-time performance of network is not strict. However, in event state the traffic is large, the critical information would be lost once the link quality goes bad without responding timely. This paper does...
Requirements for Wireless Sensor networks will increase in the future. Requirements are demanding, especially in industrial real time networks which require high reliability and performance. Network simulation tools are often needed in the network design phase before actual implementation. In this paper, we selected 5 common wireless sensor networks simulation tools and estimated their suitability...
This paper proposes AREA-MAC, a medium access control (MAC) protocol for wireless sensor networks (WSNs). AREA-MAC reduces latency and energy consumption of nodes by using low power listening (LPL) with short preamble messages. Other protocols like B-MAC use long preamble messages that cause higher latency, energy consumption, and control overhead on nodes. AREA-MAC provides a reasonable trade-off...
In wireless sensor networks, majority of routing protocols considered energy efficiency as the main objective and assumed data traffic with unconstrained delivery requirements. However, the introduction of image and video sensors demands certain quality of service (QoS) from the routing protocols and underlying networks. Managing real-time data requires both energy efficiency and QoS assurance in...
In wireless sensor networks, both real time and reliable transmission are the big research challenge. But current approaches in these research fields have not been well explored because there are so many restrictions on respective sensor node. In this paper, we propose a new reliable real time routing protocol in sensor networks. For real time delivery, we introduce a time-based forwarding scheme...
DoD migration to Service Oriented Architectures (SOA) enriches warfighter information access and, in so doing, intensifies the need for related real-time applications distributed across large geographic areas with highly mobile users and sensors. Such applications require exchange of critical, time-sensitive data among local as well as distant users across resource constrained networks, and as such...
The adoption of new hardware and software architectures will make future generations of pervasive devices more flexible and extensible. Networks of computational nodes will be used to compose such systems. In these networks tasks will be delegated dynamically to different nodes (that may be either general purpose or specialized). Thus, a mechanism to verify the reliability of the nodes is required,...
Employing wireless communication in industrial applications requires methods that deal with the high fraction of packet errors common to wireless transmissions. At the same time, industrial applications have real-time demands that protocols like TCP are unable to support. This paper combines ARQ (automatic repeat request) with real-time worst-case scheduling analysis to achieve both high reliability...
With an increased focus on national security and public safety communications, the US Congress revisited its plan to reclaim television broadcaster frequencies to be reallocated and auctioned by the FCC and it specifically allocated a portion of that spectrum for use by public safety. The FCC was charged with the duty of auctioning this spectrum and licensing it to create a public safety network....
This paper describes how we can use existing mobile technology to track the vehicle. Here the embedded system along with the mobile is used to prevent the vehicle from being stolen and also if the vehicle is stolen then its location can be tracked. Mobile technology is the fastest growing communication mode. In todaypsilas mobile technology we all are acquainted with short message service (SMS). In...
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