a seamless handoff for dual interfaced mobile devices in hybrid wlan
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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

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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
Outline
  • Introduction
  • Dual-Interface Handoff Mechanisms
  • Performance Evaluation Of Handoff
  • Conclusions
outline1
Outline
  • Introduction
  • Dual-Interface Handoff Mechanisms
  • Performance Evaluation Of Handoff
  • Conclusions
introduction
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
characteristics of the overlay networks
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
outline2
Outline
  • Introduction
  • Dual-Interface Handoff Mechanisms
  • Performance Evaluation Of Handoff
  • Conclusions
dual interface handoff mechanisms
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
the policy interfaces follow 1 3
The policy Interfaces follow (1/3)

TH1wlan > SNR > TH2wlan

WLAN2

SNR > TH1wlan

WLAN1

the policy interfaces follow 2 3
The policy Interfaces follow (2/3)

SNR < TH2wlan

SNR > TH2wlan

WLAN

GPRS

the policy interfaces follow 3 3
The policy Interfaces follow (3/3)

SNR < THGPRS

GPRS2

SNR > THGPRS

GPRS1

horizontal handoff between wlans
Horizontal Handoff between WLANs

WLAN2

SNR > TH1wlan

TH1wlan > SNR > TH2wlan

WLAN1

vertical handoff from wlan to gprs
Vertical Handoff from WLAN to GPRS

SNR < TH2wlan

SNR > TH2wlan

WLAN

GPRS

outline3
Outline
  • Introduction
  • Dual-Interface Handoff Mechanisms
  • Performance Evaluation Of Handoff
  • Conclusions
outline4
Outline
  • Introduction
  • Dual-Interface Handoff Mechanisms
  • Performance Evaluation Of Handoff
  • Conclusions
conclusions
Conclusions
  • The handoff requires that MN can control the switching of communication between two dual mode interfaces
reference
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
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