A Basic Study on Communication Characteristics by Bluetooth Low Energy for iConstruction At present, construction machines such as excavators and cranes are built with communication modules in order to connect to networks. Therefore, the construction machines can be controlled through commands sent via the network to improve productivity. This is called iconstruction. Two examples of iconstruction are remote control and automatic control systems for the construction machine. In these systems, generally, wireless communication is used. However, the wireless communication characteristics that need to be considered in iconstruction are still unclear. In order to clarify, this paper seeks to characterize the characteristics of Bluetooth Low Energy (BLE) communication when used in construction machines. In the evaluations, we use a BLE beacon module. Experimental results show that the BLE beacon module can communicate between the sender in the excavatoru0027s attachment and receiver in the cabin. The results show that there is a possibility that the wireless communication systems can be applied for the construction machines.

On the Effect of BLE Beacons on Fast Bluetooth Connection Establishment Scheme Mobile ad hoc networks (MANETs) consist of mobile terminals, such as smartphones or tablets. In Bluetooth MANETs, mobile terminals communicate with each other using Bluetooth without communication infrastructures such as base stations. Therefore, Bluetooth MANETs are deemed to be one of the communication schemes to disseminate data when base stations cannot be used in case of disaster. Since data dissemination capability or network scale that can be built deeply depends on connection establishment performance in Bluetooth MANETs, a fast Bluetooth connection establishment scheme has been proposed to establish Bluetooth connections rapidly. The fast Bluetooth connection establishment scheme combines Classic Bluetooth and Bluetooth Low Energy (BLE), and it has advantages of two different Bluetooth standards. BLE beacons utilize advertising packets of BLE to broadcast data to adjacent terminals. Since the fast Bluetooth connection establishment scheme also utilizes BLE to detect adjacent terminals, it is thought that the radio interference cause delay in detecting adjacent terminals when there are many BLE beacons within wireless range. In this paper, we conducted the simulation experiments in the Bluetooth MANETs environment to evaluate the effects of BLE beacons on the connection establishment by the fast Bluetooth connection establishment scheme.