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Source publication
This paper gives out a PUB/SUB-based application server software, which aims at improving the coarse granularity of the pushed information in current LBS systems. Taking the advantage of PUB/SUB system's asynchronous, loosely-coupled and multiplex communication mechanism, the server software pushes LBS information with its granularity refined. By c...
Contexts in source publication
Context 1
... application module is highly modularized with its defined functions, as it is depicted in Fig. 2. All components are independent of each other and reusable. In this way, the system has good properties of openness and extensibility. In addition, privacy protection mechanism is also considered. But it is not the major concern of this paper and it can be referred to in [10]. ...
Context 2
... test platform includes eleven identical Windows-7-based PCs and one Ubuntu-server-based PC. In the test process, ten PCs host publisher, one PC hosts the subscriber, and the server PC hosts the service server. In addition, the Positioning Middleware is also running on the server. Fig. 2 shows the case that publishers send event data to the subscriber. The size of the event notification information is limited to 1Kb. With this condition, we measure the average delivery time with increasing number of ...
Citations
... In fact, LBS are a key piece of this dynamism, not just because LBS are hunger of more resources from network devices but also because they take advantage of the virtuosities of new communication technologies to construct new possibilities of relation among users, between users and service providers, and also between providers and third parties such as contents' providers. Neither it is strange that all these systems' elements are object of permanent research and keep in permanent revision [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. This paper focuses in network based positioning technologies and particularly in the mitigation of an important issue, which strongly degrades the accuracy of the subscriber due to the specific propagation conditions of the wireless signals, known as Non Line Of Sight (NLOS) condition. ...
Este artículo estudia el problema de la mitigación de la condición de ausencia de Línea de Visión en sistemas de posicionamiento de suscriptor móvil utilizando la ponderación de medidas de Tiempo de Arribo y la aplicación de restricciones geométricas. En par-ticular, este trabajo parte de una caracterización más exacta de la estadística de la señal, para conseguir factores de ponderación con capacidad de alcanzar una mitigación más efectiva, y consecuentemente un posicionamiento más preciso del suscriptor móvil. Adicionalmente, se incorporan restricciones basadas en la geometría de la celda como método de refinamiento complementario. Se presentan en consecuencia tres nuevos métodos de posicionamiento con mejores propiedades que los tomados de la literatura y usados como referencia. Estas técnicas se evalúan dentro de un escenario de simulación realista.
