TSG-RAN Working Group 2 (Radio L2 and Radio L3) 	R2-000945
Seoul, Korea, 10 - 13 April 2000

Source:	TSG-RAN WG2

To:		TSG-CN WG1

Cc:		TSG-SA WG1, SMG2

Title: 		Response to LS (S1-000103) on UE/MS idle mode operation

Contact:	Joakim Bergstrom, Ericsson
	+46 8 404 7396 joakim.bergstrom@era.ericsson.se

TSG-RAN WG2 thanks TSG-CN WG1 for their LS on UE/MS idle mode operation.
In TSG-RAN WG2 concerns were raised regarding the changes of the cell selection and re-selection principles at this late stage.
The principle that TSG-RAN WG2 is using is in accordance with the conclusion of the WS in June 99.
From "3GPP WS on handover and cell selection" in June 99
Establishing priorities between PLMN selection, mode selection and cell selection
There was a common agreement that the PLMN selection should be performed prior to the mode selection and the cell selection, i.e. the PLMN is chosen first and, once the PLMN is selected, the choice of the mode has to be decided among the ones offered by the chosen PLMN. This second step is under the control of the selected operator.
The meeting agreed that PLMN selection can be decided by the user/application, but once the PLMN selected, the user only provides wishes of the requested services and has no capability to actually choose the serving cell nor the RAN. 

This means that the UE should first select PLMN then choose cell according to that operator. The selection within that PLMN is based on radio criteria and not on RAT priorities.

This is also according to the current specification text in TS 25.304 " UE Procedures in Idle mode and Procedures for Cell Reselection in Connected Mode" v3.2.0 in section 5.2.