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LTE: How does inter rat handover work ?

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LTE: How does inter rat handover work ?
posted Feb 4, 2014 by Ganesh Kumar

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1 Answer

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Inter RAT handovers can be following:-
• Intra LTE inter cells HO (LTE HO within eNB)
• Intra LTE inter eNB HO (LTE HO between eNB)
• Inter LTE HO (HO between LTE and other access technologies)
– Between E-UTRAN and UTRAN (3G)
– Between E-UTRAN and GSM
– Between E-UTRAN and non 3GPP Access

And for every handover there is separate algorithm and measurements.

The steps used:-

• Setting up measurements
• Evaluating measurement reports
• Handover Preparation
• Handover Execution
• Handover Completion
• Data forwarding
• If inter-RAT is to GSM, NACC(Network assisted Cell Change) is used and no resources are prepared in the target system. UE enter GSM system in RRC_Idle mode and start the RRC Connection Setup Procedure.

The below algorithm diagram is just for reference to a inter RAT handover: -
Inter RAT Handover

answer Feb 4, 2014 by Hiteshwar Thakur