Handoff in Handoff in Cellular SystemsCellular Systems

Defining HandoffsDefining Handoffs What?What? Why?Why? When?When?

Major TopicsMajor Topics Deployment scenarios and handoffDeployment scenarios and handoff Resource management in cellular Resource management in cellular

systemsystem Implementation of handoffImplementation of handoff Analysis of handoff algorithmsAnalysis of handoff algorithms

Deployment scenarios and Deployment scenarios and handoffhandoff

MacrocellsMacrocells

Deployment scenarios and Deployment scenarios and handoffhandoff

MicrocellsMicrocells a) Half-square cell plana) Half-square cell plan b) Full- square cell plan b) Full- square cell plan c) Rectangular cell planc) Rectangular cell plan

Deployment scenarios and Deployment scenarios and handoffhandoff

Macrocell/Microcell overlaysMacrocell/Microcell overlays

Deployment scenarios and Deployment scenarios and handoffhandoff

Special ArchitecturesSpecial Architectures a) underlay/overlay systema) underlay/overlay system b) Multiple channel bandwidth systemb) Multiple channel bandwidth system

Deployment scenarios and Deployment scenarios and handoffhandoff

Integrated Wireless SystemsIntegrated Wireless Systems a) Integrated Terrestrial Systemsa) Integrated Terrestrial Systems b) Integrated Terrestrial and Satellite b) Integrated Terrestrial and Satellite

SystemsSystems c) Handoff from Land Mobile Satellite Systemc) Handoff from Land Mobile Satellite System

to the Terrestrial System to the Terrestrial System d) Handoff from the Terrestrial system to the d) Handoff from the Terrestrial system to the

LandLand Mobile Satellite System Mobile Satellite System

Handoff PrioritizationHandoff Prioritization Guard channelsGuard channels Queuing of HandoffsQueuing of Handoffs

Resource management in Resource management in cellular systemcellular system

Admission controlAdmission control Channel allocationChannel allocation a) Fixed Channel Assignmenta) Fixed Channel Assignment b) Dynamic Channel Assignmentb) Dynamic Channel Assignment c) Flexible Channel Assignmentc) Flexible Channel Assignment

Resource management in Resource management in cellular systemcellular system

Power controlPower control HandoffHandoff

Implementation of handoffImplementation of handoffResource Management Integrated Handoff Resource Management Integrated Handoff

AlgorithmAlgorithm Combined Intracell Handoff and Channel Combined Intracell Handoff and Channel

assignmentassignment SIR based Integrated Handoff algorithmSIR based Integrated Handoff algorithm RSS based Integrated Handoff algorithmRSS based Integrated Handoff algorithm Integrated power control and Handoff Integrated power control and Handoff

algorithmalgorithm

Implementation of handoffImplementation of handoff Network Controlled Handoff Network Controlled Handoff

ProtocolProtocol Mobile Assisted Handoff protocolMobile Assisted Handoff protocol Soft Handoff ProtocolSoft Handoff Protocol Mobile Controlled Handoff ProtocolMobile Controlled Handoff Protocol

Analysis of handoff Analysis of handoff algorithmsalgorithms

The Analytical ApproachThe Analytical Approach The Simulation ApproachThe Simulation Approach a) Cell modela) Cell model b) Propagation modelb) Propagation model c) Traffic modelc) Traffic model d) Mobility modeld) Mobility model The Emulation ApproachThe Emulation Approach

CONCLUSIONCONCLUSION

FUTURE???FUTURE???

REFERENCESREFERENCES www.IEEE.comwww.IEEE.com http://portal.acm.org/portal.cfmhttp://portal.acm.org/portal.cfm www.awl.com/csengwww.awl.com/cseng

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