1 / 22

A Seamless Handoff for Dual-interfaced Mobile Devices in Hybrid WLAN

A Seamless Handoff for Dual-interfaced Mobile Devices in Hybrid WLAN. Speaker : Rui-Yi Chien Date : 2005 / 02 / 17. Outline. Introduction Dual-Interface Handoff Mechanisms Performance Evaluation Of Handoff Conclusions. Outline. Introduction Dual-Interface Handoff Mechanisms

paley
Télécharger la présentation

A Seamless Handoff for Dual-interfaced Mobile Devices in Hybrid WLAN

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. A Seamless Handoff for Dual-interfaced Mobile Devices in Hybrid WLAN Speaker : Rui-Yi Chien Date : 2005 / 02 / 17

  2. Outline • Introduction • Dual-Interface Handoff Mechanisms • Performance Evaluation Of Handoff • Conclusions

  3. Outline • Introduction • Dual-Interface Handoff Mechanisms • Performance Evaluation Of Handoff • Conclusions

  4. Introduction • Today’s wireless access network consist of several overlapping tiers • Provision of real time undisrupted communication to mobile users , anytime and anywhere through these heterogeneous overlay networks , is a challenge

  5. A Typical Heterogeneous Network

  6. Characteristics of the Overlay Networks • The network’s service areas are overlapped • Two network support different data rates • The signal powers received from the BSs of the different networks are incomparable • When there is a change in IP address of the MN , process may cause service disruption

  7. Outline • Introduction • Dual-Interface Handoff Mechanisms • Performance Evaluation Of Handoff • Conclusions

  8. State Model of an Interface

  9. Dual-Interface Handoff Mechanisms • Use two interfaces each capable of connecting to the WLAN & GPRS networks • Two different thresholds (TH1WLAN , TH2WLAN) of Signal to Noise Ratio (SNR) • TH1WLAN > TH2WLAN • Only WLAN subnet is scanned and connected • TH1WLAN > SNR > TH2WLAN • The interface may be attached to GPRS • TH2WLAN < SNR

  10. The policy Interfaces follow (1/3) TH1wlan > SNR > TH2wlan WLAN2 SNR > TH1wlan WLAN1

  11. The policy Interfaces follow (2/3) SNR < TH2wlan SNR > TH2wlan WLAN GPRS

  12. The policy Interfaces follow (3/3) SNR < THGPRS GPRS2 SNR > THGPRS GPRS1

  13. Horizontal Handoff between WLANs WLAN2 SNR > TH1wlan TH1wlan > SNR > TH2wlan WLAN1

  14. Vertical Handoff from WLAN to GPRS SNR < TH2wlan SNR > TH2wlan WLAN GPRS

  15. Vertical Handoff from GPRS to WLAN SNR > TH2wlan WLAN GPRS

  16. Outline • Introduction • Dual-Interface Handoff Mechanisms • Performance Evaluation Of Handoff • Conclusions

  17. Performance Evaluation (1/2)

  18. Performance Evaluation (2/2)

  19. Outline • Introduction • Dual-Interface Handoff Mechanisms • Performance Evaluation Of Handoff • Conclusions

  20. Conclusions • The handoff requires that MN can control the switching of communication between two dual mode interfaces

  21. Reference • A seamless handoff for dual-interfaced mobile devices in hybrid wireless access networksInayat, R.Aibara, R.Nishimura, K.Advanced Information Networking and Applications, 2004. AINA 2004. 18th International Conference on 2004 IEEE

  22. Thanks

More Related