Handoff Prioritization and Decision Schemes in Wireless Cellular Networks: a Survey

陳恂達 Hsun-Da Chen

Institute of Communications EngineeringNational Chung Cheng University

Author:

Aggeliki Sgora

Dimitrios D. Vergados

IEEE COMMUNICATIONS & TUTORIALS, VOL. 11, NO. 4, FOURTH QUARTER 2009

Outline

Introduction Handoff Process Horizontal Handoff Process Vertical Handoff Process Conclusion References

Introduction

Cellular Networks Handoff Horizontal Handoff Vertical Handoff

Introduction

Handoff Process

Types of Handoff Performance Metrics of Handoff Schemes

Handoff Process

Types of Handoff

Handoff Process

Types of Handoff

Handoff Process

Performance Metrics of Handoff SchemesNew (or originating) call blocking probabilityHandoff call blockingHandoff probabilityCall droppingDelayChannel utilization efficiency

Horizontal Handoff Process

Handoff PhasesMeasurementInitiationDecision

Mobile-Controlled Handoff (MCHO) Network-Controlled Handoff (NCHO) Mobile-Assisted Handoff (MAHO)

Execution

Horizontal Handoff Process

Handoff Schemes

Horizontal Handoff Process

Handoff Schemes

Horizontal Handoff Process

Handoff SchemesNon-Prioritized Scheme (NPS)Prioritization Schemes

Channel Reservation Schemes (CRS) Handoff Queuing Schemes (HQS) Channel Transferred Handoff Schemes (CTS) SubRating Schemes (SBRS) Genetic Handoff Schemes (GHS) Hybrid Handoff Schemes (HHS)

Horizontal Handoff Process

Vertical Handoff Process

Handoff PhasesSystem discoveryHandoff decisionHandoff execution

Vertical Handoff Process

Handoff Schemes

Vertical Handoff Process

Vertical Handoff SolutionsNetwork Layer Vertical Handoff Solutions

WWAN-WLAN 3G-WLAN

Upper Layer Vertical Handoff Solutions Migration Monitor Module Handoff-aware TCP Core Module Resumption Module

Conclusion

Handoff schemes on homogeneous and heterogeneous networks.

Pros and cons of handoff schemes The most recent handoff prioritization

References

[1] Sgora, A.; Vergados, D.D.; Communications Surveys & Tutorials, IEEE Volume 11, Issue 4, Fourth Quarter 2009 Page(s):57 - 77