Functions related to Mobile Station (MS) in idle mode and group receive mode
The present document gives an overview of the tasks undertaken by a GSM Mobile Station (MS) when in idle mode, that is, switched on but not having a dedicated channel allocated, e.g. not making or receiving a call, or when in group receive mode, that is, receiving a group call or broadcast call but not having a dedicated connection. It also describes the corresponding network functions. The idle mode functions are also performed by a GPRS MS as long as no dedicated channel is allocated to the MS. The idle mode functions are also performed by a CTS MS as long as the CTS MS is in manual mode GSM only or in automatic mode under PLMN coverage.
NOTE: The term GSM MS is used for any type of MS supporting one, or combinations, of the frequency bands specified in GSM 05.05.
The present document outlines how the requirements of the GSM 02 series Technical Specifications (especially GSM 02.11) on idle mode operation shall be implemented. Further details are given in GSM 04.08 and GSM 05.08.
Clause 2 of the present document gives a general description of the idle mode process. Clause 3 outlines the main requirements and technical solutions of those requirements. Clause 4 describes the processes used in idle mode. There is inevitably some overlap between these clauses. Clause 5 describes the cell change procedures for a MS in group receive mode.
1a 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.
[1] GSM 01.04: "Digital cellular telecommunications system (Phase 2+); Abbreviations and acronyms".
[2] GSM 02.01: "Digital cellular telecommunications system (Phase 2+); Principles of telecommunications services supported by a GSM Public Land Mobile Network (PLMN)".
[3] GSM 02.02: "Digital cellular telecommunication system (Phase 2+); Bearer Services (BS) supported by a GSM Public Land Mobile Network (PLMN)".
[4] GSM 02.03: "Digital cellular telecommunications system (Phase 2+); Teleservices supported by a GSM Public Land Mobile Network (PLMN)".
[5] GSM 02.04: "Digital cellular telecommunications system (Phase 2+); General on supplementary services".
[6] GSM 02.06: "Digital cellular telecommunications system (Phase 2+); Types of Mobile Stations (MS)".
[7] GSM 02.07: "Digital cellular telecommunications system (Phase 2+); Mobile Station (MS) features".
[8] GSM 02.09: "Digital cellular telecommunications system (Phase 2+); Security aspects".
[9] GSM 02.11: "Digital cellular telecommunications system (Phase 2+); Service accessibility".
[10] GSM 02.16: "Digital cellular telecommunications system (Phase 2+); International Mobile station Equipment Identities (IMEI)".
[11] GSM 02.17: "Digital cellular telecommunications system (Phase 2+); Subscriber identity modules Functional characteristics".
[12] GSM 02.24: "Digital cellular telecommunications system (Phase 2+); Description of Charge Advice Information (CAI)".
[13] GSM 02.30: "Digital cellular telecommunications system (Phase 2+); Man‑Machine Interface (MMI) of the Mobile Station (MS)".
[14] GSM 02.40: "Digital cellular telecommunications system (Phase 2+); Procedures for call progress indications".
[15] GSM 02.41: "Digital cellular telecommunications system (Phase 2+); Operator determined barring".
[16] GSM 02.81: "Digital cellular telecommunications system (Phase 2+); Line identification supplementary services ‑ Stage 1".
[17] GSM 02.82: "Digital cellular telecommunications system (Phase 2+); Call Forwarding (CF) supplementary services ‑ Stage 1".
[18] GSM 02.83: "Digital cellular telecommunications system (Phase 2+); Call Waiting (CW) and Call Hold (HOLD) supplementary services - Stage 1".
[19] GSM 02.84: "Digital cellular telecommunications system (Phase 2+); MultiParty (MPTY) supplementary services ‑ Stage 1".
[20] GSM 02.85: "Digital cellular telecommunications system (Phase 2+); Closed User Group (CUG) supplementary services ‑ Stage 1".
[21] GSM 02.86: "Digital cellular telecommunications system (Phase 2+); Advice of Charge (AoC) supplementary services ‑ Stage 1".
[22] GSM 02.88: "Digital cellular telecommunications system (Phase 2+); Call Barring (CB) supplementary services ‑ Stage 1".
[23] GSM 04.08: "Digital cellular telecommunications system (Phase 2+); Mobile radio interface layer 3 specification".
[24] GSM 05.02: "Digital cellular telecommunications system (Phase 2+); Multiplexing and multiple access on the radio path".
[25] GSM 05.08: "Digital cellular telecommunications system (Phase 2+); Radio subsystem link control".
[26] GSM 02.60: "Digital cellular telecommunications system (Phase 2+); General Packet Radio Service (GPRS); Service description Stage 1".
[27] GSM 03.60: "Digital cellular telecommunications system (Phase 2+); General Packet Radio Service (GPRS); Service description Stage 2".
[28] GSM 03.64: "Digital cellular telecommunications system (Phase 2+); General Packet Radio Service (GPRS); Overall description of the GPRS Radio Interface; Stage 2".
[29] GSM 02.56: "Digital cellular telecommunications system (Phase 2+); GSM Cordless Telephony System (CTS); Service Description; Stage 1.
[30] GSM 03.56: "Digital cellular telecommunications system (Phase 2+); GSM Cordless Telephony System (CTS); CTS Architecture Description; Stage 2.
[31] 3GPP TS 23.122: " Non-Access-Stratum functions related to Mobile Station (MS) in idle mode".
[32] 3GPP TS 24.008: " Mobile radio interface layer 3 specification; Core Network Protocols - Stage 3".
1b Definitions and abbreviations
Abbreviations used in the present document are listed in GSM 01.04.
Selected PLMN This is the PLMN that has been selected according to subclause 3.1, either manually or automatically.
Available PLMN This is a PLMN where the MS has found a cell that satisfies conditions (ii) and (iv) of subclause 3.2.1.
Home PLMN (HPLMN) See 3GPP TS 23.122.
Registered PLMN (RPLMN) This is the PLMN on which certain LR outcomes have occurred (see 3GPP TS 23.122).
Equivalent PLMN A PLMN contained in the stored list of equivalent PLMNs. These PLMNs are considered equivalent to the selected PLMN regarding PLMN selection, cell selection, cell re-selection and handover (see 3GPP TS 23.122).
Registration This is the process of camping on a cell of the PLMN and doing any necessary LRs.
Camped on a cell The MS (ME if there is no SIM) has completed the cell selection/reselection process and has chosen a cell from which it plans to receive all available services. Note that the services may be limited, and that the PLMN may not be aware of the existence of the MS (ME) within the chosen cell.
Current serving cell This is the cell on which the MS is camped.
Suitable Cell This is a cell on which an MS may camp. It must satisfy criteria defined in subclause 3.2.1. For an MS in group receive mode, the suitable cell is determined by the criteria defined in subclause 5.2.3.
Acceptable Cell This is a cell that the MS may camp on to make emergency calls. It must satisfy criteria defined in sub clause 3.2.2.
Group call A communication in which several MSs can receive, but at most one may be allowed to transmit on a radio channel. Examples of group calls are those established for the voice group call service (VGCS, see GSM 03.68).
Broadcast call A communication in which several MSs can receive, but only the originator of the call is allowed to transmit on the radio channel. Examples of the broadcast call are those established for the voice broadcast service (VBS, see GSM 03.69).
Group receive mode State of the MS when it is engaged in a group or broadcast call as a listener.
GPRS MS An MS capable of GPRS services is a GPRS MS.
CTS MS An MS capable of CTS services is a CTS MS.
Location Registration (LR) An MS which is IMSI attached to non-GPRS services only performs location registration by the Location Updating procedure. A GPRS MS which is IMSI attached to GPRS services or to GPRS and non-GPRS services performs location registration by the Routing Area Update procedure only when in a network of network operation mode I. Both procedures are performed independently by the GPRS MS when it is IMSI attached to GPRS and non-GPRS services in a network of network operation mode II or III (see GSM 03.60).
Localised Service Area (LSA) A localised service area consists of a cell or a number of cells. The cells constituting a LSA may not necessarily provide contiguous coverage.
SoLSA exclusive access Cells on which normal camping is allowed only for MS with Localised Service Area (LSA) subscription.
Registration Area A registration area is an area in which mobile stations may roam without a need to perform location registration. The registration area corresponds to location area (LA) for performing location updating procedure and it corresponds to routing area for performing the routing area update procedure.
The PLMN to which a cell belongs (PLMN identity) is given in the system information transmitted on the BCCH (MCC + MNC part of LAI).