4 Heterogeneous Networks Mobility Enhancements

25.3003GPPGeneral descriptionRelease 17Stage 2TSUniversal Terrestrial Radio Access Network (UTRAN)

Neighbour Cell List (NCL) extension

– The size of the inter-frequency neighbour cell list is extended for CELL_DCH, CELL_FACH, CELL_PCH, URA_PCH states and Idle mode, so that network could configure more inter-frequency neighbour cells than 32 for UE to monitor and detect under massive small cell deployment scenario.

Change of best cell on a configured secondary downlink frequency (event 2g)

– Event 2g is an inter-frequency measurement event. It is applicable only to the secondary downlink frequency with configured HS-DSCH operation, and it can be configured on more than one secondary downlink frequency.

Enhanced Serving Cell Change for Event 1C

– The enhanced Serving Cell Change procedure could also be applied to Event 1C, which is defined in TS 25.308 [2].