Providing Group Tour Guide by RFIDs and WSNs

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Providing Group Tour Guide by RFIDs and WSNs
Yu-Chee Tseng CS.NCTU (a joint work with
NTHU) (to appear in IEEE Trans. on Wireless Comm.
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Motivation

• Traditional tour guide
• personalized guiding
• by portable audio/mobile devices
• ?They do not consider tourists as a group.
• Our goals
• a group guiding framework
• Feasible
• Low management effort
• group guiding protocol
• with a prototype

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System overview Services
Leader tracking
Memberrecall
Help service
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Group guiding services

• Leader tracking
• Sensors cooperate to track the locations of group
  leaders.
• Help service
• Help lost members to find their leaders.
• Member recall
• A leader can call his/her members.
• Push message
• A leader can push information to his/her members.

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Group guiding protocol (1/2)

• How to track a group leader
• a signal-strength based method by bidding

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Group guiding protocol (2/2)

• Mobility management

A local update is proposed to reduce update
messages.
A potential-based method is adopted for sensors
to trace the locations of leaders.
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System Architecture (WSN RFID system)
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Leader badge direction board
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Help (Information) Center
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Help service GUI
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Prototyping system Member-recall
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Simulation results

• Area 100m100m
• Nodes 1010, 3030, and 5050
• Transmission range 15m
• Trans. Data rate 256 kbps
• Obstacles 24 or 42
• Pkt. Loss 0 20
• Each group has one leader and multiple members.

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Performance metrics

• Message overhead
• Tracking leader
• Support group guiding services
• Scalability
• Length of guiding path
• Routing property

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Message overhead Scalability
Impact of obstacles on message overhead
Message overhead vs. Leader mobility
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Length of guiding path
AEH Avg. excess hops
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Response time vs. Packet loss
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Overall message overhead
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Conclusions

• a feasible GROUP tour guide system
• based on RFID
• ease of management
• Future work
• integrating with real tour information
• realization in mobile devices, such as iPhone or
  gPhone