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Content for  TS 25.304  Word version:  16.0.0

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1  ScopeWord‑p. 7

The present document specifies the Access Stratum (AS) part of the Idle Mode procedures applicable to a UE. The non-access stratum (NAS) part of Idle mode procedures and processes is specified in [5].
The present document also specifies cell selection and reselection processes applicable to UEs in connected mode. Invocation of these processes is described in [4].
The present document specifies the model for the functional division between the NAS and AS in a UE.
The present document 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;
The present document 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.
The present document also specifies how idle-mode and reselection procedures are affected by the provision of MBMS services.

2  References

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
  • References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific.
  • For a specific reference, subsequent revisions do not apply.
  • For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
TS 43.022: "Functions related to Mobile Station in idle mode and group receive mode".
TS 25.301: "Radio Interface Protocol Architecture".
TS 25.303: "Interlayer Procedures in Connected Mode".
TS 25.331: "Radio Resource Control (RRC); protocol specification".
TS 23.122: "NAS functions related to Mobile Station (MS) in idle mode ".
TR 25.922: "Radio Resource Management Strategies".
TS 25.211: "Physical channels and mapping of transport channels onto physical channels (FDD)".
TS 25.221: "Physical channels and mapping of transport channels onto physical channels (TDD)".
TS 22.011: "Service accessibility".
TS 25.133: "Requirements for Support of Radio Resource Management (FDD)".
TS 25.123: "Requirements for Support of Radio Resource Management (TDD)".
TR 21.905: "Vocabulary for 3GPP Specifications".
TS 45.008: "Radio subsystem link control".
TS 25.214: "Physical layer procedures (FDD)".
TS 25.224: "Physical Layer Procedures (TDD)".
TS 24.008: "Mobile radio interface layer 3 specification, Core Network Protocols - Stage 3".
TS 25.346: "Introduction of the Multimedia Broadcast Multicast Service (MBMS) in the Radio Access Network (Stage-2)".
TS 36.304: "Evolved Universal Terrestrial Radio Access (E-UTRA); User Equipment (UE) procedures in idle mode".
TS 25.321: "MAC Protocol Specification".
TS 37.320: "Universal Terrestrial Radio Access (UTRA) and Evolved Universal Terrestrial Radio Access (E-UTRA); Radio measurement collection for Minimization of Drive Tests (MDT); Overall description; Stage 2".
TS 23.060: "General Packet Radio Service (GPRS); Service description; Stage 2".
TS 23.682: "Architecture enhancements to facilitate communications with packet data networks and applications".
TS 23.402: "Architecture enhancements for non-3GPP accesses".
IEEE 802.11-2012, Part 11: "Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications, IEEE Std.".
Wi-Fi Alliance Technical Committee, Hotspot 2.0 Technical Task Group: "Hotspot 2.0 (Release 2) Technical Specification".
TS 25.215: "Physical layer - Measurements (FDD)".
TS 25.225: "Physical layer - Measurements (TDD)".
TS 24.302: "Access to the 3GPP Evolved Packet Core (EPC) via non-3GPP access networks".

3  Definitions and abbreviationsWord‑p. 8

3.1  Definitions

For the purposes of the present document, the following definitions and the definitions in [12] apply.
Absolute priority layer:
A priority level can be defined for a UTRA frequency, a group of GSM frequencies or a E-UTRA frequency.
CSG whitelist:
A list provided by NAS containing all the CSG identities and their associated PLMN IDs of the CSGs to which the subscriber belongs.
Acceptable Cell:
A cell that satisfies certain conditions as specified in 4.3. A UE can always attempt emergency calls on an acceptable cell.
Available PLMN:
A PLMN for which the UE has found at least one cell and read its PLMN identity.
Barred Cell:
A cell a UE is not allowed to camp on.
Camped on a cell:
UE has completed the cell selection/reselection process and has chosen a cell. The UE monitors system information and (in most cases) paging information.
Camped on any cell:
UE is in idle mode and has completed the cell selection/reselection process and has chosen a cell irrespective of PLMN identity.
Camped on MBSFN cluster:
UE has completed the MBSFN Cluster selection/reselection process and has chosen a MBSFN Cluster. The UE monitors system information and receives notifications for MBMS services and possibly receives a MBMS service.
Closed Subscriber Group (CSG):
A Closed Subscriber Group identifies subscribers of an operator who are permitted to access one or more cells of the PLMN but which have restricted access (CSG cells).
CSG cell:
A cell broadcasting a CSG Indicator that is set to TRUE and a specific CSG identity. All the UTRAN CSG cells sharing the same identity and PLMN identity are identifiable as a single group for the purposes of mobility management and charging.
CSG identity:
An identifier broadcast by a CSG or hybrid cell/cells and used by the UE to facilitate access for authorised members of the associated Closed Subscriber Group.
CSG member cell:
a cell broadcasting the identity of the selected PLMN, registered PLMN or equivalent PLMN and for which the CSG whitelist of the UE includes an entry comprising cell's CSG ID and the respective PLMN identity.
DRX cycle:
Individual time interval between monitoring Paging Occasion for a specific UE.
Any of the PLMN entries contained in the Equivalent HPLMN list stored on the USIM [5].
Equivalent PLMN list:
List of PLMNs considered as equivalent by the UE for cell selection, cell reselection , MBSFN Cluster selection MBSFN Cluster reselection, and handover according to the information provided by the NAS.
HNB Name:
The Home NodeB Name is a broadcast string in free text format that provides a human readable name for the Home NodeB CSG identity and any broadcasted PLMN identity.
Home PLMN:
A PLMN where the Mobile Country Code (MCC) and Mobile Network Code (MNC) of the PLMN identity are the same as the MCC and MNC of the IMSI.
Hybrid cell:
A cell not broadcasting a CSG Indicator but broadcasting a specific CSG identity.
Location Registration (LR):
UE registers its presence in a registration area, for instance regularly or when entering a new registration area.
Maximum DRX cycle:
Time interval for the longest possible DRX cycle in a cell.
MBMS Activated Service:
An MBMS service that the UE has joined (multicast) or is interested in (broadcast).
MBMS Preferred Layer (PL):
A frequency layer that is indicated by the UTRAN to be preferred for camping for MBMS purposes.
MBSFN cluster:
Set of cells operating in MBSFN mode providing only MBMS service in PtM mode and seen as one cell by a UE.
MBSFN mode:
In order to achieve higher spectral efficiency synchronized cells operate in MBSFN mode which implies that they transmit exactly the same content over an area that is seen as one MBSFN cell by the UE.
Paging Block Periodicity (PBP):
Period of the occurrence of Paging Blocks. (For FDD, PBP = 1).
Paging Message Receiving Occasion (TDD only):
The frame where the UE receives actual paging message.
Paging occasion:
(FDD) The SFN of the PICH frame where the UE monitors its paging indicator (i.e. the SFN of the PCCPCH frame in which the PICH frame begins).
(TDD) The paging block, which consists of several frames. The value of Paging Occasion is equal to the first frame of the Paging Block.
Power saving mode:
Mode allowing the UE to reduce its power consumption, as defined in TS 24.008, TS 23.060, TS 23.682.
A local action in the UE invoked by a RRC procedure or an Idle Mode procedure.
Radio Access Mode:
Radio access mode of the cell, FDD or TDD.
Radio Access Technology:
Type of technology used for radio access, for instance UTRA or GSM.
Registered PLMN:
This is the PLMN on which certain Location Registration outcomes have occurred [5].
Registration Area:
(NAS) registration area is an area in which the UE may roam without a need to perform location registration, which is a NAS procedure.
Reserved Cell:
A cell on which camping is not allowed, except for particular UEs, if so indicated in the system information.
Restricted Cell:
A cell on which camping is allowed, but access attempts are disallowed for UEs whose access classes are indicated as barred.
Selected PLMN:
This is the PLMN that has been selected by the NAS, either manually or automatically.
Serving cell:
The cell on which the UE is camped.
Strongest cell:
The cell on a particular carrier that is considered strongest according to the layer 1 cell search procedure [14][15]. As the details of the layer 1 cell search are implementation dependent, the precise definition of 'strongest cell' is also implementation dependent.
Suitable Cell:
This is a cell on which an UE may camp. For a UTRA cell, the criteria are defined in subclause 4.3, for a GSM cell the criteria are defined in [1] and for a E-UTRA cell the criteria are defined in [18].

3.2  AbbreviationsWord‑p. 10

For the purposes of the present document, the following abbreviations apply:
Application specific Congestion control for Data Communication
Access Network Discovery and Selection Function
Automatic Neighbor Relation
Access Stratum
Broadcast Control Channel
Basic Service Set
Connection Management
Commercial Mobile Alert System
Core Network
Closed Subscriber Group
Discontinuous Reception
Downlink Shared Channel
Evolved UMTS Terrestrial Radio Access
Evolved UMTS Terrestrial Radio Access Network
Earthquake and Tsunami Warning System
Frequency Division Duplex
General Control (SAP)
General Packet Radio Service
Global System for Mobile Communications
Hierarchical Cell Structure
Integrated Mobile Broadcast
International Mobile Subscriber Identity
Multimedia Broadcast-Multicast Service
MBMS over a Single Frequency Network
Mobile Country Code
MBMS point-to-multipoint Control Channel
Minimization of Drive Tests
MBMS notification Indicator Channel
Mobility Management
Mobile Network Code
MBMS point-to-multipoint Scheduling Channel
MBMS point-to-multipoint Traffic Channel
Non-Access Stratum
(MBMS) Notification Indicator
Paging Channel
Page Indicator
Page Indication Channel
Public Land Mobile Network
Power Saving Mode
Radio Access Technology
Radio Resource Control
Service Access Point
Time Division Duplex
Temporary Mobile Group Identity
User Equipment
Universal Mobile Telecommunications System
UMTS Terrestrial Radio Access
UMTS Terrestrial Radio Access Network

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