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Providing Group Tour Guide by RFIDs and WSNs. Yu-Chee Tseng, CS.NCTU (a joint work with NTHU) (in IEEE Trans. on Wireless Comm.) ( 中華民國專利 : " 使用無線感測網路提供群組導引服務之方法及系統 ", I319947). Motivation. Traditional tour guide: personalized guiding by portable audio/mobile devices

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providing group tour guide by rfids and wsns

Providing Group Tour Guide by RFIDs and WSNs

Yu-Chee Tseng, CS.NCTU

(a joint work with NTHU)

(in IEEE Trans. on Wireless Comm.)

(中華民國專利: "使用無線感測網路提供群組導引服務之方法及系統", I319947)

motivation
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
system overview services
System overview & Services

Leader tracking

Memberrecall

Help service

group guiding services
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.
group guiding protocol 1 2
Group guiding protocol (1/2)
  • How to track a group leader
    • a signal-strength based method by “bidding”
group guiding protocol 2 2
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.

simulation results
Simulation results
  • Area: 100m*100m
  • Nodes: 10*10, 30*30, and 50*50
  • Transmission range: 15m
  • Trans. Data rate: 256 kbps
  • Obstacles: 2*4 or 4*2
  • Pkt. Loss: 0% ~ 20%
  • Each group has one leader and multiple members.
performance metrics
Performance metrics
  • Message overhead
    • Tracking leader
    • Support group guiding services
  • Scalability
  • Length of guiding path
    • Routing property
message overhead scalability
Message overhead & Scalability

Impact of obstacles on message overhead

Message overhead vs. Leader mobility

length of guiding path
Length of guiding path

AEH: Avg. excess hops

conclusions
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