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

Slides:

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Presentation transcript:

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 Performance Evaluation Of Handoff Conclusions

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

A Typical Heterogeneous Network

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

Outline Introduction Dual-Interface Handoff Mechanisms Performance Evaluation Of Handoff Conclusions

State Model of an Interface

Dual-Interface Handoff Mechanisms Use two interfaces each capable of connecting to the WLAN & GPRS networks Two different thresholds (TH1 WLAN, TH2 WLAN ) of Signal to Noise Ratio (SNR)  TH1 WLAN > TH2 WLAN Only WLAN subnet is scanned and connected  TH1 WLAN > SNR > TH2 WLAN The interface may be attached to GPRS  TH2 WLAN < SNR

The policy Interfaces follow (1/3) Interface1 Active Interface2 Standby SNR > TH1wlan TH1wlan > SNR > TH2wlan Interface2 OFF WLAN2 WLAN1

The policy Interfaces follow (2/3) SNR > TH2wlan SNR < TH2wlan Interface1 Active Interface2 Ready Interface2 OFF WLAN GPRS

The policy Interfaces follow (3/3) SNR > THGPRS SNR < THGPRS Interface1 Ready Interface2 Ready Interface2 OFF GPRS1 GPRS2

Horizontal Handoff between WLANs Interface1 Active SNR > TH1wlan TH1wlan > SNR > TH2wlan Interface2 OFF Interface2 Standby Interface1 Standby Interface2 Active Interface1 Idle WLAN1 WLAN2

Vertical Handoff from WLAN to GPRS SNR > TH2wlan SNR < TH2wlan Interface1 Active Interface2 Standby Interface2 OFF Interface1 Standby Interface1 Idle Interface2 Ready WLAN GPRS

Vertical Handoff from GPRS to WLAN SNR > TH2wlan Interface1 Off Interface2 Active Interface2 Standby Interface1 Standby Interface1 Active Interface2 Off WLAN GPRS

Outline Introduction Dual-Interface Handoff Mechanisms Performance Evaluation Of Handoff Conclusions

Performance Evaluation (1/2)

Performance Evaluation (2/2)

Outline Introduction Dual-Interface Handoff Mechanisms Performance Evaluation Of Handoff Conclusions

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

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