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the data collecting operation from ten terminals, A-J in Fig. 9, to two mesh root terminals, R1 and R2 in Fig. 9 (construct mesh 1 and mesh 2, respectively). Consequently, as shown in Table 1, we found that both meshes could implement a data collection success rate of 90% or more.4Conclusionsis report described the research and development concerning the high-capacity data collection network as one operation mode of the wireless grid structure in which many terminals relay data in a coordinated manner.is research and development studied the proper building and operation of the radio mesh structure by the application of the L2R technology, and evaluated the imple-mentation and operation of the autonomous mesh topol-ogy construction function, data concatenation function and multiple services supporting function. A future agenda item is the further sophistication of L2R technology in response to the application diversication anticipated in the future.Acknowledgmentse recommended practice of IEEE 802.15.10 was standardized by Verotiana RABARIJAONA, a researcher of NICT (at that time) and Hiroshi HARADA, a professor at Kyoto University (at the present day)[6][7]. In addition, Verotiana RABARIJAONA conducted the evaluation ex-periments described in this report when she was a re-searcher. Furthermore, SUN has been standardized by Hiroshi HARADA as IEEE 802.15.4g[4], and the social development of SUN is being promoted through the estab-lishment of Wi-SUN Alliance[9], a standard certication body.ReferenceR1Y. Rachlin, R. Negi, and P. Khosla, “Sensing capacity for discrete sensor network applications,” in Conf. Rec. 2005 IEEE Information Processing in Sensor Networks, pp.126–132.2W. R. Heinzelman, A. Chandrakasan, and H. Balakrishnan, “Energyefficient communication protocol for wireless microsensor networks,” in Conf. Rec. 2000 Hawaii International Conference on System Sciences,pp.1–10, vol.2.3Q. Li, J. A. Aslam, and D. Rus, “Online power-aware routing in wireless ad-hoc networks,” in Conf. Rec. 2001 MOBICOM, pp.97–107.4IEEE802.15.4 g, “Part 15.4 : Low-Rate Wireless Personal Area Networks(LR-WPANs), Amendment 3 : Physical Layer (PHY) Specifications for Low-Data-Rate, Wireless, Smart Metering Utility Networks,” 2012.5IEEE802.15.4, “Part 15.4 : Wireless Medium Access Control (MAC) and Physical Layer (PHY) Specifications for Low- Rate Wireless Personal Area Networks (WPAN),” 2009.6IEEE 802.15.10, “IEEE Recommended Practice for Routing Packets in IEEE 802.15.4 Dynamically Changing Wireless Networks,” 2017.7Verotiana Rabarijaona, Fumihide Kojima, Hiroshi Harada, and Clint Powell, “Enabling Layer 2 Routing in IEEE std 802.15.4 Networks with IEEE Std 802.15.10,” IEEE Communications Standards Magazine, vol.1, no.1. pp.44–49, March 20178Verotiana Rabarijaona, Fumihide Kojima, and Hiroshi Harada, “Hierarchical Mesh Routing Implementation for Indoor Data Collection,” IEEE 27 th International Symposium on Personal, Indoor and Mobile Radio Communication (PIMRC’16), Valencia, Spain, Sept. 20169Wi-SUN alliance, “Wi-SUN alliance,” http://www.wi-sun.org/10ECHONET CONSORTIUM, “ECHONET Lite Specification ver. 1.00,” 2012.Fumihide KOJIMA, Dr. Eng.Director, Wireless Systems Laboratory, Wireless Networks Research CenterWireless communcation, Wireless access controlVerotiana RABARIJAONA, Dr. Eng.Former: Researcher, Wireless Systems Laboratory, Wireless Networks Research CenterWireless routing, Wireless access control352-5 Research and Development on the Large-Scale Mesh Management Technologies for Building-Sensing Applications