Handover Criteria Considerations In Convergent Networks

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Handover Criteria Considerations In Convergent
Networks

• Mehdi MANI
• GET-INT
• France

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Outlines

• Definition of Convergent Networks
• Advanced Required HO Decision Criteria
• Our Contribution
• Simulation Results
• Conclusion

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Recall Vertical Convergence vs Horizontal
Convergence



Telephony Services
Wireless Services
Internet Services
Internet
Wireless
Wireline
Unified Network
and Unified Services
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Assumptions

• Existence of Hybrid Technologies

• Different Overlapping Scenario

Cell 2/ Technology 2
Cell 1/ Technology 1
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Handover Triggering Motivation in Convergent
Networks

• Low Level
• QoS Degradation
• Requested service
• Availability of better price and QoS for the
  active applications
• User Preferences

• High Level
• Terminal Mobility
• Session Transfer

Triggering Handover Process
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Service Model

• Internet
• Network is Transparent.
• End points provide the services.
• Users only pay to have access to internet
  regardless of the service they use.

• Telephony
• Network operator and service provider control the
  access of customers to the network for each
  service.
• User is billed for the amount of resources
  allocated for the service.

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Mobility Management Protocol

• End point intelligent MIP (HMIP, FMIP), SIP
• Network Intelligent HLR/VLR, NETLMM, HIP
• For Handover
• Goal is to reduce the handover delay and
  supporting AAA functionality

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Handover Decision Criteria

• New Requirement
• Access network condition DBw, UBw, PER, SNR,
• User Preferences expected QoS level for the
  service
• Terminal Capabilities Multimode, Battery
  Consumption,
• Service TypeVoIP, Video Phony, Conferencing,
  web, email, File transferring applications
• Access Capabilities
• Cost

• Conventional Criteria
• RSS
• BER
• Speed

Inefficient resource utilization Non-satisfying
service
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Our Contribution

• Defining a cost function satisfying
• New requirement of hybrid-technology
• Strategy for admitting the HO requests Load
  Balancing
• Effects of Session based Handover on resource
  utilization efficiency.

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Cost Function

• Goal Selecting the access with the least Cost
  Function
• Cn,aCharging Rate for Cell n and application a
• Bn Bandwidth of Cell n
• Pn,a Power Consumption of cell n and application
  a

Service Priority
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Different Charging Scenario
Charging rates should not be compared without
considering QoS condition of the network
Retransmission Factor (RTF) is defined for this
purpose.
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Strategy of Request Admission Load
Balancing
Best Bandwidth Best QoS

• -Select the best strategy

• Considering the capability of each Overlying
  Technology
• Distributing the load according to the supporting
  services in each technology

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Admission Policies -Cost of Vertical
Handover-Load Balancing
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Load Balancing Factor (LBF) (2)

• Bw2Mbps
• GP(2,8,20)
• Video128kbps
• Voice32Kbps
• Web16Kbps

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Another Feature

• Session (application) Based Handover or
• Distribution of sessions over different
  technologies

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Optimization in Resource Utilization
In average, 20 of improvement in resource
utilization
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Vertical Handover Ratio
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Blocked Handover
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Satisfaction Factor
15 Improvement in User Satisfaction
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Conclusion Future Works

• Conventional Handover criteria are not efficient.
• Considering well defined cost function can lead
  to more efficient utilization of Radio Link
  resources up to 35 more than RSS.
• Distribution of Resources in the price of more
  handover signaling increase the satisfaction of
  customers and resource utilization factor.

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Thank You!