Comparison of the Frequency Bands for the Wireless Sensor Networks in the Building Environment

다국어 초록 (Multilingual Abstract)

In this paper, for the pratical building envoronments, the propagation properties of the electromagnetic waves of the sub-1GHz bands, including the 447MHz, 868MHz, and 715MHz, and the 2.4GHz band are experimentally observed in therms of the received signal strength indicator (RSSI) value. The compasion of the frequency bands can be utilized to efficiently construct the wireless sensor networks (WSN) for the building automation control. In order to measure the RSSI values in the building, an RSSI measurement system is first designed, in which the master part can transmit data packets and measure the corresponding RSSI values, and the slave part can respond the received data packets. Using the measurement system, the RSSI values are then experimentally measured at four types of building enviroments. From the experimental result analysis, we could notice that the sub-1GHz, especially the 447MHz band, showd a good communication performance for the building environment and could provide an efficient WSN construction when the data rate is relatively low.

목차 (Table of Contents)

• Abstract
• 1. Introduction
• 2. Design of the RSSI Measurement System
• 3. Experimental Conditions for Comparing the Propagation Properties
• 3.1 RSSI Measurements for Rooms with Walls
• 3.2 RSSI Measurements on the Same Floor
• 3.3 RSSI Measurements for Multiple Floors of the Building
• 3.4 RSSI Measurements for Various Obstacle Materials
• 4. Experimental Results
• 4.1 Experiments for Rooms with Walls
• 4.2 Experiments on the Same Floor
• 4.3 Experiments for Multiple Floors of the Building
• 4.4 Experiments for Various Obstacle Materials
• 5. Conclusion
• Acknowledgement
• References