Abstract
One of the main challenges in the implementation and design of context-aware scenarios is the adequate deployment strategy for Wireless Sensor Networks (WSNs), mainly due to the strong dependence of the radiofrequency physical layer with the surrounding media, which can lead to non-optimal network designs. In this work, radioplanning analysis for WSN deployment is proposed by employing a deterministic 3D ray launching technique in order to provide insight into complex wireless channel behavior in context-aware indoor scenarios. The proposed radioplanning procedure is validated with a testbed implemented with a Mobile Ad Hoc Network WSN following a chain configuration, enabling the analysis and assessment of a rich variety of parameters, such as received signal level, signal quality and estimation of power consumption. The adoption of deterministic radio channel techniques allows the design and further deployment of WSNs in heterogeneous wireless scenarios with optimized behavior in terms of coverage, capacity, quality of service and energy consumption.
Highlights
The complexity of indoor scenario characterization concerns signal propagation, and interferences caused by the coexistence of different communication systems working in the same frequency band or by the congestion due to abundant deployment of wireless devices
Deterministic radioplanning techniques have been applied in order to fully determine the characteristics of the wireless channel for each one of the nodes of a Wireless Sensor Network in an indoor scenario
By taking into account all of the elements of the scenario, such as walls, hallways and furniture, detailed information on the topological dependence of the network layout can be obtained. This influences the expected values of coverage of each individual node, and determines maximum capacity performance, due to the fact that interference levels are dependent on the network topology
Summary
The complexity of indoor scenario characterization concerns signal propagation, and interferences caused by the coexistence of different communication systems working in the same frequency band or by the congestion due to abundant deployment of wireless devices. A seasoned designer of wireless sensor networks (WSN) usually quite identifies which are the most suitable sites to locate the nodes of the network, but a subsequent experimental validation is required in order to ensure that the decision is correct and that the network operates in accordance with the requirements set by the customer For such reason, simulation, modeling and analysis of WSNs are required. An in house implemented 3D Ray Launching code is employed, which has been adapted to the analysis of scenarios in which wireless sensors and transceivers can be allocated in multiple positions This approach provides estimations of multiple quality assurance metrics (such as coverage levels, time dependent parameters such as power delay profiles and more elaborate estimators, such as current consumption), in an alternative manner as the common empirical/statistical solutions commonly reported.
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