Many emergent distributed sensing applications need to keep track of mobile entities across multiple sensor networks connected via an IP network. To simplify the realization of such applications, we present MLDS, a Mu...
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ISBN:
(纸本)9783540730897
Many emergent distributed sensing applications need to keep track of mobile entities across multiple sensor networks connected via an IP network. To simplify the realization of such applications, we present MLDS, a Multi-resolution Location Directory Service for tiered sensor networks. MLDS provides a rich set of spatial query services ranging from simple queries about entity location, to complex nearest neighbor queries. Furthermore, MLDS supports multiple query granularities which allow an application to achieve the desired tradeoff between query accuracy and communication cost. We implemented MLDS on Agimone, a unified middleware for sensor and IP networks. We then deployed and evaluated the service on a tiered testbed consisting of tmote nodes and base stations. Our experimental results show that, when compared to a centralized approach, MLDS achieves significant savings in communication cost while still providing a high degree of accuracy, both within a single sensor network and across multiple sensor networks.
The deployment of complex, multi-threaded sensor network applications is growing rapidly (e.g there are dual-core sensor mote platforms such as the Microsoft m-platform). This paper argues that parallelism can benefit...
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ISBN:
(纸本)9781467347211
The deployment of complex, multi-threaded sensor network applications is growing rapidly (e.g there are dual-core sensor mote platforms such as the Microsoft m-platform). This paper argues that parallelism can benefit networked sensors, particularly if it is based on a safe approach, i.e., follows a deadlock-free paradigm. sensor network applications should be deadlock-free because applications running on sensor networks are often critical and thus, it is undesirable to encounter concurrency problems in such environments. This paper presents an approach to ensuring safe parallelism in sensor networks and shows a number of potential benefits to this domain. This is particularly highlighted by a case study on runtime reconfigurable wireless network communication that promotes deadlock-free reconfigurable parallelism.
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