Relocations in UMTSJustin MA

22nd Dec 2014

Relocation in CSUE Involved

UE Not-Involved

Relocation in CS

UE Involved

The combined inter-RNC HHO and

RN relocation procedure is UE involved , since the UE is ordered to switch to another carrier frequency or

to replace the whole active set by

sending a HHO command to the UE

during the relocation procedure.HHO

SRNS relocation is started when the current active set only comprises cells belonging to the DRNC (aka Target RNC).

The relocation procedure is initiated by the SRNC (aka Source RNC).

Relocation in CS

UE Not-Involved

Mobility

Information

Updating

Comparison of UE Involved and Not-Involved

in Relocation CS

UE Involved (UE still in SRNC) UE Not-Involved (UE already in DRNC)

HHO Mobility

Information

Updating

UE is

connected

to SRNC

UE is

connected

to DRNC

Relocation in PSUE Involved

UE Not-Involved

Relocation in PS

UE Involved

HHO

Relocation in PS

UE Not-Involved

Mobility

Information

Updating

Comparison of UE Involved and Not-Involved

in Relocation PS

UE Involved (UE still in SRNC) UE Not-Involved (UE already in DRNC)

HHO Mobility

Information

Updating

UE is

connected

to SRNC

UE is

connected

to DRNC

Conclusions

Relocation with UE Involved has risk to do the inter-RNC HO in the border before getting connection to DRNC.

Relocation with UE Not-Involved has following often failure causes: UP setup failure UTRAN Mobility Information procedure failure or timeout