Handover Strategies in GSM System

Table of Contents

• Abstract
• Chapter 1
  • Introduction
  • History of GSM
  • Overview of GSM handover
    • Between calls
    • During a call
  • The connection establishment in WLAN and the scanning concept
    • Discovery
    • Authentication
    • Association, Disassociation and Re-association
    • Confidentiality
    • The AP discovery and association
      • Passive scanning
      • Active scanning
• Chapter 2
  • Literature review
  • Definition of the handover process
  • Types of handover technique
  • Reasons of handover failure
  • The differences between hard, soft and softer handoffs
  • SYNC handovers and asynchronous handover
  • Emergency handovers
  • Vertical and horizontal handover
  • "Multilayer Handover" Strategy, "Ping pong effect" and "take-back"
  • Handover decisions in GSM
  • GSM handover solutions
  • Mathematical calculations and modulations
• Chapter 3
  • The focus- calculate the optimal timing and distance for GSM vertical handover
  • Time Before Vertical Handover (TBVH)
  • Time Before Vertical Handover (for outdoor environments)
  • Time Before Vertical Handover (for indoor environments) - Mobile node movement from a normal BS to BBS
• Chapter 4
  • The Simulation and Result for the TBVH
  • Why Matlab program
  • Modulation
  • Decision algorithm
• Chapter 5
  • Conclusion and Future work
• References

Objectives and Key Themes

This dissertation explores the challenges of signal interference within the GSM handover system and aims to find solutions to improve the user experience. It investigates different types of handover techniques, focusing on vertical handover and specifically the "Time Before Vertical Handover" (TBVH).

• GSM handover system and its challenges
• Different types of handover techniques
• Vertical handover and TBVH
• Optimizing timing and distance for vertical handover
• Simulating and analyzing TBVH using MATLAB

Chapter Summaries

Chapter 1 introduces the GSM system, its history, and its handover mechanisms. It also discusses the connection establishment process in WLAN and the concept of scanning. Chapter 2 delves into a literature review of handover processes, including various types of handovers, reasons for failure, and differences between hard, soft, and softer handoffs. It also explores emergency handovers, vertical and horizontal handover, and handover decisions in GSM. Chapter 3 focuses on calculating the optimal timing and distance for GSM vertical handover, particularly discussing the TBVH for both outdoor and indoor environments. Chapter 4 explores the simulation and results of TBVH using MATLAB software, outlining the reasons for choosing this program, the modulation process, and the decision algorithm. Chapter 5 concludes the dissertation, summarizing the findings and suggesting areas for future research.

Keywords

This dissertation focuses on GSM handover, signal interference, vertical handover, Time Before Vertical Handover (TBVH), optimal timing and distance, MATLAB simulation, handover techniques, and solutions for improving GSM network performance.