Mobile & Sensor Network

Safety Confirmation System with DTN-based Message Routing in 3G Disabled Areas Caused by Large-Scale Disaster

yoshi-k.posterWe propose a message delivery system which can deliver Twitter messages on safety confirmation tweeted in 3G disabled area (caused by large-scale disaster) to the 3G available area by utilizing DTN (Disruption-Tolerant Networking). The messages reaching the 3G available area are sent to the Twitter system so that they can be read on the Internet. The system also cooperates with the disaster database such as Google Person Finder and registers the safety confirmation in the Twitter messages with the database. The goal of the system is (1) to deliver Twitter messages to 3G available area in as short time as possible, and (2) to deliver reply messages on Twitter to the original message sender who is somewhere in the 3G disabled area reliably and quickly. To realize this goal, in the proposed system, users record the movement history consisting of positions and 3G availability at the positions and the encounter history with other users in their mobile phones. The routing table is constructed based on the histories and it is updated by exchanging the table with other users when encountering. We also describe computer simulation scenarios to evaluate the performance of the proposed routing method.

Related Paper

  • Yoshi Koyama,Teruhiro Mizumoto,Shinya Imazu,Keichi Yasumoto,”Safety Confirmation System with DTN-based Message Routing in 3G Disabled Areas Caused by Large-Scale Disaster”,IPSJ SIG Technical Report,Vol.2012-MBL-?? (2012-05).


A Routing Method for Lifetime Maximization of Wireless Multimedia Sensor Networks for Object Tracking

In recent years,to research about Wireless Multimedia Sensor Networks(WMSN) are becoming more prosperous. In this research, we proposed Object Tracking System by using WMSN. In this system, to monitor the field by a sensor node equipped with a video sensor and human sensor, the sensor senses some object if the intrusion in the field, and start recording.Recorded video of taken object is encoded for transmission to the mobile terminal which carried by the user in real time by the wireless multi-hop communication.User can confirm the object at all times by tracking with changing attention node according to moving of object.In this case, if battery of some sensor nodes depleted, we will not be tracking the object by holes caused in coverage of the field.Using battery of all sensor nodes evenly is required for extending the work time of WMSN.In the proposed method, it is assumed urgency is higher the closer the distance of the mobile user and the moving object is close, and set short delivery delay time, with respect to what the distance is far, so as to avoid the node with little remaining battery capacity, we are conducting research and development of WMSN for routing protocol that incorporates the ideas, such as setting video delivery path detour to the user.

Related Paper

  • Kyohei Fujimoto,Keiichi Yasumoto,Weihua Sun,Yukiko Yamauchi,Minoru Ito,”A Routing Method for Lifetime Maximization of Wireless Multimedia Sensor Networks for Object Tracking”,IPSJ DICOMO 2011 Symposium(2011-07).

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