tailieunhanh - GeoSensor Networks - Chapter 5

Chúng tôi xem xét vấn đề truy vấn và dữ liệu tuyên truyền trong bối cảnh của các mạng geosensor trên cảm biến nhận thức về địa lý. Trong các mạng như vậy, kỹ thuật tuyên truyền có hiệu quả của các truy vấn và dữ liệu đóng một vai trò quan trọng trong việc giảm tiêu thụ năng lượng. Georouting là một kỹ thuật mới cho việc phát dữ liệu địa phương và các truy vấn trong các mạng cảm biến nhận thức về địa lý, nó làm cho việc sử dụng của cây truy vấn định tuyến hiện. | Georouting and Delta-Gathering Efficient Data Propagation Techniques for GeoSensor Networks Dina Goldin Mingjun Song Ayferi Kutlu Huayan Gao and Hardik Dave Dept. of Computer Science and Engineering University of Connecticut Storrs CT 06269 USA ABSTRACT We consider the issue of query and data propagation in the context of geo sensor networks over geo-aware sensors. In such networks techniques for efficient propagation of queries and data play a significant role in reducing energy consumption. Georouting is a new technique for the broadcasting of localized data and queries in geo-aware sensor networks it makes use of the existing query routing tree and does not involve the creation of any additional communication channels. In addition to localized broadcasting georouting is useful for nonlocalized broadcasting spatial data greatly reducing the amount of communication and hence energy consumption during broadcasts. We demonstrate its effectiveness empirically having implemented this technique. In addition to broadcasting queries and data to the sensors we consider data gathering where data is being transmitted from the sensors back towards the central processor. Delta-gathering is a new technique for reducing the amount of communication during data gathering. Finally we apply our delta-gathering approach toward the problem of sensor data visualization. We present sensor terrains as a preferable alternative to isoline-based visualization contour maps for this problem. 1 INTRODUCTION Sensor networks can be embedded in a variety of geographic environments such as high-rise buildings airports highway stretches or even the ocean. They enable the monitoring of these environments for a wide variety of applications from security to biological. For many of the anticipated applications the ability to query sensor networks in an ad hoc fashion is key to their usefulness. Rather than re-engineering the network for every task as is commonly done now ad hoc querying allows the .