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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.


System architecture wsn rfid system
System Architecture (WSN + RFID system)






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


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