Development of a Network Status Visualizing System for Wireless Multihop Networks Currently, mobile devices (nodes) are equipped with cellular and short range ad hoc connections. In addition, a wireless multihop network that does not depend on base stations attracts attention, and application running on the wireless multihop network are being developed. However, in the developments and verification of these applications, it is not easy to confirm the wireless connection between nodes and the wireless network topology. In this study, we develop a network status visualizing system to visualize the node information and the network topology of a wireless multihop network which is configured by wireless nodes. The network status visualizing system consists of a log management server that manages the node information of a wireless multihop network and a computer on which the network status visualizing software is running. Each node generates a log message including its own operation status, and then, sends it to the log management server. The network status visualizing software obtains the information of nodes from the log management server. Based on the obtained node information, it visualizes the connection between the node and the neighboring nodes. From the experiments, we confirmed that the network status visualizing system can visualize the node information and connection status between nodes as a network status of a wireless multihop network.

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.