Video sensors are used in wireless multimedia sensor networks (WMSNs) to enhance the capability for event description. Due to the limited transmission capacity of sensor nodes, a single path often cannot meet the requirement of video transmission. Consequently, multipath transmission is needed. However, not every path found by multipath routing algorithms may be suitable for transmitting video, because a long routing path with a long end to end transmission delay may not satisfy the time constraint of the video. Furthermore, each video stream includes two kinds of information: image and audio streams. In different applications, image and audio streams play different roles, and the importance levels are different. Higher priority should be given to the more important stream (either the image stream or the audio stream) to guarantee the using of limited bandwidth and energy in WMSNs. In this paper, we propose a Multipriority Multipath Selection (MPMPS) scheme in transport layer to choose the maximum number of paths from all found nodedisjoint routing paths for maximizing the throughput of streaming data transmission. Simulation results show that MPMPS can effectively choose the maximum number of paths for video transmission.
Abstract-Recent years have seen the maturing of ubiquitous computing middleware and software. Accompanied by research into sensor networks and other sensor-driven applications, widespread deployment and realisation of these technologies can now be expected in the coming years. As a cheap and quick method of prototyping applications and protocols, simulation will be a key part of the development cycle for these technologies. However, existing simulators only address a subset of ubiquitous computing environments and are unsuitable for modelling the desired complexity of the domain. This paper presents initial work on the design of a generic simulation tool suitable for the many scenarios encompassed by ubiquitous computing, such as simulation of sensors, actuators, and the environment. In addition, an emulation framework for middleware and software under development is provided which interfaces with the simulation tool. We provide a layered, flexible and modular approach to supporting the simulation of ubiquitous computing environments without constraining the simulator to one aspect of the many possible ubiquitous computing deployment scenarios. Finally, we present and discuss a proof-of-concept simulation.
During the development of context aware applications a context management component must traditionally be created. This task requires specialist context lifecycle management expertise and hence can be a significant deterrent to application development. It also removes the developers focus from differentiation of their application to an oft repeated development task. This issue can be addressed by encapsulating the context management lifecycle within a web-service, thus providing applications with a low-overhead alternative to managing their context data. The adoption of a web-based approach maximizes the potential number of interacting applications, including smart spaces, web and mobile applications, due to ease of access and widespread support of web technologies. The contribution of this paper is the development of a lifecycle, based on existing work on enterprise data and context aware lifecycles, which is optimized for web-based context management services (WCXMS) and the provision of a web-service implementation of the lifecycle.
Simulators are indispensable tools to support the development and testing of cooperating objects such as wireless sensor networks (WSN). However, it is often not possible to compare the results of different simulation tools. Thus, the goal of this paper is the specification of a generic simulation platform for cooperating objects. We propose a platform that consists of a set of simulators that together fulfill desired simulator properties. We show that to achieve comparable results the use of a common specification language for the software-under-test is not feasible. Instead, we argue that using common input formats for the simulated environment and common output formats for the results is useful. This again motivates that a simulation tool consisting of a set of existing simulators that are able to use common scenario-input and can produce common output which will bring us a step closer to the vision of achieving comparable simulation results.
We can envision that future sensor networks (WSNs) are ubiquitous, large-scale, interconnected, which we call worldwide sensor network (WWSN). Currently, most of the WSNs are working as isolated islands. Without sharing sensor data across different domains, the most important features of ubiquitous computing (e.g. context awareness) will not be easily achieved. For sharing among WWSN, the first nut to crack is to interconnect different WSNs which are spatially deployed in different locations with IP based Internet; the second one is to integrate them into a single WWSN over the Internet for publishing, sharing and searching of sensor data. In this paper, we present the challenge issues that should be addressed for sharing WWSN, by conducting a short survey on existing approaches.
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