Guiding and Navigation:

• Emergency Navigation System in Indoor 3D Environment
• Goal
• Implementation an emergency guiding system in indoor 3D environments by wireless sensor networks. When emergencies occur, we can quickly find safe escape paths


• Emergency Guiding
• Water toward low spot
• Hazardous regions
• Distributed adjust weight to find escape path



• Tree Reconstruction
• Support reliable reporting scheme, when emergencies occur
• Dynamically recover the failure links
• Low cost and quick convergence

• A Load-Balanced Guiding Navigation Protocol in Wireless Sensor Networks
• We propose a distributed guiding navigation protocol that can guide moving objects to multiple exits with load balancing among multiple navigation paths to the exits. With the assistances of sensor nodes, moving objects are guided to different navigation paths so that they can move to exits as soon as possible without causing congestion. In some traditional navigation algorithms, a sensor may select a wrong guiding direction when an information-updating packet has not flooded through the whole network. Hence, the guiding direction of the sensor may oscillate in a short time and guided objects will confuse with this phenomenon, called direction oscillation problem. This problem will be eliminated in our proposed protocol. Simulation results indicate that our protocol can guide moving objects to exits in shorter time and solve the direction oscillation problem effectively.


• Main achievements and outcomes
• Research or technology outcomes
• The previous works do not consider the congestion problem and the direction oscillation problem is not mentioned before. Our proposed protocol can solve these two problems efficiently.

• Providing Group Tour Guide by RFIDs and Wireless Sensor Networks
• We proposes a new application framework for group tour guiding services based on RFIDs and wireless sensor networks. We consider a sensing field mixed with multiple independent tourist groups, each with a leader and several members. Members of a group will follow the moving path of their leader, but may occasionally roam around randomly based on their interest. Sensor nodes have to track leadersˇ¦ locations and maintain following paths from members to leaders. A member may ask where his/her leader is, and a leader may ˇ§recall" his/her members. We propose a feasible solution to such an application by using existing technologies. A group guiding protocol is presented. The design enables reliable group guiding at low cost and low traffic load. Our prototyping system is discussed.


• Main achievements and outcomes
• Research or technology outcomes
• The idea of group guiding has not been discussed in the previous works. We also developed a prototyping in the National Tsing Hua University. And we demo our system in IPSN 2007.