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1IntroductionAlthough SUN, the most typical embodiment for the wireless grid structure which is one study theme of NICT, was at rst based on the application to smart meters, it is easily expected that the application of SUN will not be exclusive to the smart meter system[1]–[4]. In other words, if SUN is developed so as to have such characteristics as long-term action due to low-energy action, etc. and the low-speed and low-capacity communications found in the smart meter use, it is expected to be utilized in innitely various elds. e IoT (Internet of ings) and M2M (Machine-to-Machine) elds whose signicance is of cur-rent interest are no exception. e applied areas for the SUN radio are expected to become diversied depending on the diversication of the future radio communication service demand or the diversication of applications.Figure 1 shows the concept of the extended SUN from such a standpoint. Figure 1 shows three diversication forms in concrete terms. at is, 1. “High capacity data FiF1　 Concept of extended SUN2-5 Research and Development on the Large-Scale Mesh Man-agement Technologies for Building-Sensing ApplicationsFumihide KOJIMA and Verotiana RABARIJAONAThis article reports on the NICT’s R&D activities on the high-capacity data collection network that is defined as one of capabilities for the wireless-grid systems where several radio devices are connected in the grid-like topology and realizes a harmonized data relaying among a lot of radio nodes. In these R&D activities, Layer 2 Routing (L2R) technology that is defined in IEEE 802.15.10 recommended practice and realizes effective data frame routing control via non-IP protocols with low overhead on the wireless Personal Area Network (PAN) is employed in order to achieve the suitable mesh structure construction and management. As the result, NICT’s activities including several experimental proof tests confirm that our developed techniques, such as an autonomous mesh construction for automatic route establishments, a data concatenation for data collision reduction and a radio virtualization for the diversified service support, all work effectively and feasibly in the assumed wireless grid structures.312 Terrestrial Communication Technology Research and Development