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TS 25.304 (RAN6)
UTRA – UE procedures in Idle Mode
and procedures for Cell Reselection in Connected Mode

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V14.0.0 (PDF)    2017/03    61 p.
V13.0.0    2016/01    60 p.
V12.7.0    2016/01    60 p.
V11.5.0    2014/01    55 p.
V10.7.0    2013/01    54 p.
V9.8.0    2012/09    52 p.
V8.12.0    2011/06    52 p.
V7.8.0    2009/09    44 p.
V6.10.0    2008/03    40 p.
V5.9.0    2005/10    46 p.
V4.8.0    2004/03    43 p.
V3.14.0    2004/03    43 p.

Rapporteur:  Mr. Chen, Jun
See also:  Idle-mode-related TS/TR    

This TS specifies the Access Stratum (AS) part of the Idle Mode procedures applicable to a UE. The nonaccess stratum (NAS) part of Idle mode procedures and processes is specified in TS 23.122.

This TS also specifies cell selection and reselection processes applicable to UEs in connected mode. Invocation of these processes is described in TS 25.331.

This TS specifies the model for the functional division between the NAS and AS in a UE.

This TS applies to all UEs that support at least UTRA, including multi-RAT UEs as described in 3GPP specifications, in the following cases:
  • When the UE is camped on a UTRA cell;
  • When the UE is searching for a cell to camp on;
NOTE: The details for those cases are described in the specifications of the other RAT.

This TS presents also examples of inter-layer procedures related to the idle mode processes and describes idle mode functionality of a multi-RAT UTRA/GSM/E-UTRA UE.

This TS also specifies how idle-mode and reselection procedures are affected by the provision of MBMS services.


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1   Scope [R3]   PDF-p. 7
2   References [R3]
3   Definitions and abbreviations [R3]   PDF-p. 8
4   General description of Idle mode [R3]   PDF-p. 12
5   Process and procedure descriptions [R3]   PDF-p. 18
5.1   PLMN selection      Up
5.2   Cell selection and reselection in idle mode
5.2.1   Introduction
5.2.2   States and state transitions in Idle Mode   PDF-p. 20
5.2.3   Cell Selection Process   PDF-p. 22
5.2.4   Void
5.2.5   Camped Normally State
5.2.6   Cell Reselection Evaluation Process
5.2.7   Cell Selection when leaving connected mode
5.2.8   Any Cell Selection state   PDF-p. 41
5.2.9   Camped on Any Cell State
5.3   Cell Reservations and Access Restrictions (cells not operating in MBSFN mode)
5.3a   Cell Reservations and Access Restrictions (MBSFN cells only for FDD, 3.84 Mcps TDD IMB and 3.84/7.68 Mcps TDD) [R7]      Up
5.4   Cell Selection and Reselection Processes in RRC Connected Mode   PDF-p. 44
5.5   Location Registration
5.6   Support for manual CSG Selection [R8]
5.7   Logged Measurements [R10]
5.8   Logged UTRAN ANR [R10]
5.9   Accessibility measurements [R11]
5.10   RAN-assisted WLAN interworking [R12]

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