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

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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


A typical heterogeneous network

A Typical Heterogeneous Network


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


State model of an interface

State Model of an Interface


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


Vertical handoff from gprs to wlan

Vertical Handoff from GPRS to WLAN

SNR > TH2wlan

WLAN

GPRS


Outline3

Outline

  • Introduction

  • Dual-Interface Handoff Mechanisms

  • Performance Evaluation Of Handoff

  • Conclusions


Performance evaluation 1 2

Performance Evaluation (1/2)


Performance evaluation 2 2

Performance Evaluation (2/2)


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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