Vertical Handoffs in FourthGeneration Multinetwork Environments

1
Vertical Handoffs in Fourth-Generation
Multinetwork Environments

• Janise Mcnair and Fang Zhu,
• University of Florida
• Presented by Ming-Hong Wu

2
Outline

• Introduction
• Related Work
• Vertical Handoffs in 4G Networks
• Problems in Traditional Schemes
• Proposed Scheme
• Conclusion

3
Introduction

• 4G
• An Integration of a large variety of wireless
  technologies.
• Ideal world
• Ubiquitous Computing
• Vertical Handoff
• Horizontal Handoff

4
Related Work

• MIP
• Operation of MIPv4 and MIPv6
• Micro-mobility Protocols

5
MIPv4 operation
Agent Discovery
Registration
Communication
Agent Advertisement
decapsulation
FA
encapsulation
HA
MH
CN
6
MIPv6 operation
Registration
Communication
FA
Get CoA by auto-configuration
HA
MN
7
Micro-mobility Protocols
8
Vertical Handoffs in 4G Networks

• Three stages
• Handoff decision
• Network-controlled handoff
• Mobile-controlled handoff
• Radio link transfer
• Channel assignment

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Problems in Traditional Schemes

• Traditional handoff process is insufficient for
  the challenges of the 4G system for
• Criteria
• User Selection
• Context (QoS, security)
• Interoperability

10
Vertical Handoff Decisionmetrics and policy
design (1/2)

• Decision metrics
• Service type
• Monetary cost
• Network condition
• System performance
• Mobile node conditions
• User preferences

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Vertical Handoff Decisionmetrics and policy
design (2/2)

• General form of cost function
• Ex consider bandwidth and cost

reference
12
Dynamic Vertical Handoffs with Multinetwork
optimizations (1/2)

• Three factors
• QoS factors
• Weighting factors
• Network elimination

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Dynamic Vertical Handoffs with Multinetwork
optimizations (2/2)

• Dynamic cost function
• Dynamic cost function with optimization

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Cost function performance (1/2)
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Cost function performance (2/2)
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Vertical Handoff Radio Link Transfer Design

• Vertical handoff radio link transfer
• The process of rerouting a mobile users
  connection path to his new point of attachment
• Research problems
• Formatting and interoperability
• Performance
• QoS (re) negotiation

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Context Transfer (1/2)
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Context Transfer (2/2)
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Conclusion

• Ubiquitous Computing is a good idea.
• A clear vision of 4G is not developed.
• Many problems need to be resolved, ex
• Decision algorithms
• Intelligent vertical handoffs
• Handoff policies and context-aware handoff link
  transfer
• AAA

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Reference (1/3)
Bn bandwidth Pn power consumption Cn cost
of the network
21
Reference (2/3)
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Reference (3/3)

• Stability period

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