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Next generation networks intend to offer pervasive and ubiquitous services to the customers wherever they are and whatever the application they are using. To achieve this goal, service continuity across homogenous and heterogeneous networks must be guaranteed. Although Fast Mobile IPv6 overcomes the long handover latency of Mobile IPv6 and makes this delay acceptable for real-time applications, the...
In mobile ad hoc networks (MANETs), it is increasingly important to devote attention to real-time and quality of service (QoS) issues. We present here a novel extrapolation-based and QoS-aware technology for providing soft real-time services in MANETs. The proposed technology combines elements of proactive and location-based techniques. Each node maintains a global view, which is periodically updated...
An efficient method for transmitting the robot control data over wireless Internet based on UDP protocol is proposed. The method allocates the highest priority to the robot control data and transmits them multiply from the base station. Simulation results show that very low packet delay and low packet errors can be achieved by the proposed method.
Based on the concept of random contention and collision resolution, a distributed QoS-guaranteed multiple access (QMA) protocol for mobile ad hoc networks is proposed to support multimedia service and multihop architecture. In the protocol, nodes with real-time traffic have higher priority to access channel than those with non-real-time traffic by broadcasting forecast bursts (FB) in earlier group...
Mobile IPv6 supports a global mobility solution in wireless networks. The mobile node is unable to send or receive packets during handover, due to link switching delay and IP protocol operations. This handover latency is caused by standard mobile IPv6 procedures, such as movement detection, new care of address configuration, and binding update. This configuration is the most time-consuming phase,...
This paper proposes a hybrid simulation approach for ad hoc network based on NS-2 emulation, which can provide the ability for real-world traffic to interact with a simulation. By adjusting hybrid network parameters according to the real network, we analyze the effect of different parameter settings in various experiments and compare the results with measurements in a real network. The results show...
Support for real-time traffic is crucial to many ITS (intelligent transport systems) safety applications. At the same time it is desirable to provide a number of non-safety services. In this paper, we propose a communication system for safety-critical V2I (vehicle-to-infrastructure) communication based on an extension to the upcoming IEEE 802.11p MAC standard. Real-time analysis provides the tool...
As the growth of multimedia communications involving digital audio and video, it is increasingly important for the MANET (mobile ad hoc network) routing protocols to simultaneously support both real-time and non-real-time traffic. MANET energy management should offer this support because devices are equipped with limited battery power. To achieve this end, we revise the ad hoc on-demand distance vector...
As mobile wireless networks increase in popularity and pervasiveness, seamless mobility is an important paradigm for uninterrupted services in ubiquitous network environments. In this paper, we propose a zero packet loss handoff mechanism for real-time streaming services, which is based on the SIP protocol cooperated with mobile agent, multicast, and buffering technique to overcome the affects of...
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...
Network time synchronization (NTS) is essential for any distributed systems, including disruption tolerant networks (DTNs). The feature of frequent contact disruptions and discontinuous network connections in DTNs raises a new challenge in providing the NTS service: synchronization operations may be interrupted for a long period of time when links between the time synchronization peers are opportunistic...
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...
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