Hansu Chung - 2013-10-29

Bi-directional Wireless Sensor Line Protocol(Bi-WSLP) is a sensor network communication protocol based on a line topology, which is common in outdoor monitoring cases for IoT(Internet of Things). Bi-WSLP runs fast and provides a response rapidly, yet it takes a small code size occupies small memory. Bi-WSLP can be easily ported to various hardware platforms because it is coded in C, which is the most popular programming language for embedded systems. In addition, Bi-WSLP allows transmission of large-size data such as still images as well as common sensor data such as temperature and humidity. Bi-WSLP can be modified to conform to the IEEE 802.15.4 standard.
Bi-WSLP has two separate data transmission intervals, one for transmission of common small-size sensor data and the other one for transmission of large-size data. Due to the separate intervals, small-size data can be transmitted with no significant delay even while large-size data are under transmission.
Bi-WSLP supports bidirectional data transmission, so it allows a user not only to control the operation of sensor nodes immediately, but also to receive responses to the user almost in real-time.
Bi-WSLP supports multi-hop over-the-air (OTA) programming using its bidirectional data communication and large-size data transmission capabilities. The multi-hop OTA programming capability enables remote update of multiple nodes’ firmware, so it remarkably reduces costs for maintaining already deployed sensor nodes.

Concept of Bi-WSLP Operation

Gangwon Embedded Software Cooperative Research Center(GEMS-CRC) has secured every prototypes necessary for building total system including hardware and software of low power sensor nodes and gateway, and server program suits for various platforms, and capability of interfacing various sensors, which usually change when applications change. GEMS-CRC also has secured prototypes for maintenance such as a PRMD (Portable RF channel quality Measurement Device) which measures RF condition of sensor nodes and it helps engineers to check if RF power between sensor nodes is strong enough. Thus, GEMS-CRC can say that it can provide every solution for outdoor monitoring applications required by licensed companies.
Moreover, prototypes of products developed by GEMS-CRC were certified by KCC (Korea Communication Commission). Most countries regard the frequency as the national property, so does Korea. Therefore, in order to make business with USN system, which is a wireless communication system using radio frequency, shall be certified as defined in relevant regulations of Korea. Since GEMS-CRC’s prototypes are certified by KCC, licensed companies that want to commercialize licensed technology rapidly can save certification process of KCC by utilizing or manufacturing GEMS-CRC’s prototypes for their business.

GEMS-CRC's system and prototypes