ETSI TS 143 022 V13.1.0 (2016-08)

ETSI TS 1143 022 V13.1.0 (201616-08)






TECHNICAL SPECIFICATIONION
Digital cellular telecommmmunications system (Phase e 2+) (GSM);
Functions relrelated to Mobile Station (MSS))
in idle modede and group receive mode
(3GPP TS 43.0.022 version 13.1.0 Release 13 13)

R
GLOBAL SYSTTEME FOR
MOBILE COMMUUNNICATIONS

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3GPP TS 43.022 version 13.1.0 Release 13 1 ETSI TS 143 022 V13.1.0 (2016-08)



Reference
RTS/TSGG-0143022vd10
Keywords
GSM
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3GPP TS 43.022 version 13.1.0 Release 13 2 ETSI TS 143 022 V13.1.0 (2016-08)
Intellectual Property Rights
IPRs essential or potentially essential to the present document may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (https://ipr.etsi.org/).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Foreword
This Technical Specification (TS) has been produced by ETSI 3rd Generation Partnership Project (3GPP).
The present document may refer to technical specifications or reports using their 3GPP identities, UMTS identities or
GSM identities. These should be interpreted as being references to the corresponding ETSI deliverables.
The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under
http://webapp.etsi.org/key/queryform.asp.
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
ETSI

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3GPP TS 43.022 version 13.1.0 Release 13 3 ETSI TS 143 022 V13.1.0 (2016-08)
Contents
Intellectual Property Rights . 2
Foreword . 2
Modal verbs terminology . 2
Foreword . 5
1 Scope . 6
1.1 References . 6
1.2 Definitions and abbreviations . 7
2 General description of idle mode . 9
3 Requirements and technical solutions . 9
3.1 PLMN selection and roaming . 9
3.2 Camping on a cell . 9
3.2.1 Normal camping . 9
3.2.2 "Camp on any cell" . 10
3.3 Regional provision of service . 10
3.4 Borders between registration areas . 10
3.5 Barred cells and access control . 10
3.5.1 Barred cells . 10
3.5.2 Prioritizing cells . 10
3.5.2.1 For cell selection . 11
3.5.2.2 For cell reselection . 11
3.5.3 Access control . 11
3.5.4 Forbidden LA for regional provision of service . 11
3.5.5 Barred cell due to failed network authentication check . 11
3.6 Radio constraints . 11
3.7 No suitable cell (limited service state) . 12
3.8 CTS fixed part selection . 12
4 Overall process structure . 12
4.1 Process goal . 12
4.2 States description . 13
4.3 List of states . 13
4.3.1 List of states for the PLMN selection process . 13
4.3.2 List of States for the cell selection process (figure 3) . 13
4.3.3 List of states for location updating . 14
4.3.4 List of states for location registration . 14
4.4 PLMN selection process . 14
4.4.1 Introduction. 14
4.4.2 Registration on a PLMN . 14
4.4.3 PLMN selection . 14
4.4.4 Abnormal cases . 14
4.4.5 Roaming not allowed in this LA . 14
4.5 Cell selection process . 14
4.6 Location registration process . 17
4.7 Service indication . 17
4.8 BCCH allocation broadcasting and storage . 17
4.9 Pageability of the mobile subscriber . 18
4.10 MM Restart procedure . 18
5 Group receive mode . 18
5.1 General description. 18
5.2 Requirements and technical solutions . 18
5.2.1 Network provisions . 18
5.2.2 Group receive mode cell monitoring . 19
5.2.3 Group receive mode cell change . 20
ETSI

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3GPP TS 43.022 version 13.1.0 Release 13 4 ETSI TS 143 022 V13.1.0 (2016-08)
5.2.4 Uplink access in group calls . 20
5a Broadcast/multicast receive mode . 20
5a.1 General description. 20
5a.2 Requirements and technical solutions . 21
5a.2.1 Network provisions . 21
5a.2.2 Broadcast/multicast receive mode cell monitoring . 21
5a.2.3 Broadcast/multicast receive mode cell change . 21
6 Tables and figures . 22
Annex A (informative): Change history . 23
History . 25

ETSI

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3GPP TS 43.022 version 13.1.0 Release 13 5 ETSI TS 143 022 V13.1.0 (2016-08)
Foreword
rd
This Technical Specification has been produced by the 3 Generation Partnership Project (3GPP).
The contents of the present document are subject to continuing work within the TSG and may change following formal
TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an
identifying change of release date and an increase in version number as follows:
Version x.y.z
where:
x the first digit:
1 presented to TSG for information;
2 presented to TSG for approval;
3 or greater indicates TSG approved document under change control.
y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections,
updates, etc.
z the third digit is incremented when editorial only changes have been incorporated in the document.
ETSI

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3GPP TS 43.022 version 13.1.0 Release 13 6 ETSI TS 143 022 V13.1.0 (2016-08)
1 Scope
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), when in group
receive mode, that is, receiving a voice group call or voice broadcast call but not having a dedicated connection or when
in broadcast/multicast receive mode, that is, receiving an MBMS session but not having a dedicated channel allocated.
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 3GPP TS 45.005.
The present document outlines how the requirements of the 3GPP TS 22 series Technical Specifications (especially
3GPP TS 22.011) on idle mode operation shall be implemented. Further details are given in 3GPP TS 44.018 and 3GPP
TS 45.008.
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. Clause 5a describes the cell change procedures for a MS in broadcast/multicast receive mode.
1.1 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] 3GPP TS 21.905: "Vocabulary for 3GPP Specifications".
[2] (void)
[3] (void)
[4] (void)
[5] (void)
[6] (void)
[7] (void)
[8] (void)
[9] 3GPP TS 22.011: " Service accessibility".
[10] (void)
[11] (void)
[12] (void)
[13] (void)
[14] (void)
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3GPP TS 43.022 version 13.1.0 Release 13 7 ETSI TS 143 022 V13.1.0 (2016-08)
[15] (void)
[16] (void)
[17] (void)
[18] (void)
[19] (void)
[20] (void)
[21] (void)
[22] (void)
[23] 3GPP TS 44.018: "Mobile radio interface layer 3 specification; Radio Resource Control (RRC)
protocol".
[24] (void)
[25] 3GPP TS 45.008: "Radio subsystem link control".
[26] 3GPP TS 22.060: "General Packet Radio Service (GPRS); Service description; Stage 1".
[27] 3GPP TS 23.060: "General Packet Radio Service (GPRS); Service description; Stage 2".
[28] 3GPP TS 43.064: "General Packet Radio Service (GPRS); Overall description of the GPRS Radio
Interface; Stage 2".
[29] (void)
[30] (void)
[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".
[33] 3GPP TS 31.102: "Characteristics of the USIM application".
[34] 3GPP TS 43.068: "Voice Group Call Service (VGCS); Stage 2".
[35] 3GPP TS 43.069: "Voice Broadcast service (VBS); Stage 2".
[36] 3GPP TS 45.005: "Radio transmission and reception".
[37] 3GPP TS 51.011: "Specification of the Subscriber Identity Module - Mobile Equipment (SIM-ME)
interface" (Release 4).
[38] 3GPP TS 43.246: "Multimedia Broadcast Multicast Service (MBMS) in the GERAN; Stage 2".
[39] 3GPP TS 22.268: "Public Warning System (PWS) requirements; Stage 1".
[40] 3GPP TS 23.682: "Architecture enhancements to facilitate communications with packet data
networks and applications".
1.2 Definitions and abbreviations
For the purposes of the present document, the terms and definitions given in 3GPP TS 21.905 [1] and the following
apply.
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.
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3GPP TS 43.022 version 13.1.0 Release 13 8 ETSI TS 143 022 V13.1.0 (2016-08)
Home PLMN (HPLMN) See 3GPP TS 23.122 [31].
Registered PLMN (RPLMN) This is the PLMN on which certain LR outcomes have occurred (see 3GPP
TS 23.122 [31]).
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 [31]).
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 and to receive
warning notifications. It must satisfy criteria defined in sub clause 3.2.2.
EC operation See 3GPP TS 43.064 [28].
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 3GPP TS 43.068 [34]).
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 3GPP TS 43.069 [35]).
Group receive mode State of the MS when it is engaged in a voice group or voice 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 3GPP TS 23.060 [27]).
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.
Power Efficient Operation See 3GPP TS43.064 [28].
Power Saving Mode (PSM): Mode allowing the MS to reduce its power consumption, as defined in TS 24.008
[32], TS 23.060 [27], TS 23.682 [40].
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).
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3GPP TS 43.022 version 13.1.0 Release 13 9 ETSI TS 143 022 V13.1.0 (2016-08)
2 General description of idle mode
See 3GPP TS 23.122.
When NAS indicates that PSM starts (as defined in 3GPP TS 23.682 [40]) the MS shall suspend all AS functions and
consequently all idle mode tasks until when NAS indicates that PSM ends the MS shall resume all AS functions and all
idle mode tasks.
3 Requirements and technical solutions
The following subclauses list the main requirements of idle mode operation and give an outline of the technical
solution.
3.1 PLMN selection and roaming
See 3GPP TS 23.122.
3.2 Camping on a cell
3.2.1 Normal camping
For normal service, the MS has to camp on a suitable cell, tune to that cell's control channel(s), and possibly register
within the PLMN so that the MS can:
a) Receive system information from the PLMN , e.g., the cell options ;
b) Receive paging messages from the PLMN, e.g., when there is an incoming call for the MS;
c) Initiate call setup for outgoing calls or other actions from the MS (where possible, see subclauses 3.5.3 and
3.5.4).
The choice of such a suitable cell for the purpose of receiving normal service is referred to as "normal camping". There
are various requirements that a cell must satisfy before an MS can perform normal camping on it:
i) It should be a cell of the selected PLMN or, if the selected PLMN is equal to the last registered PLMN, an
equivalent PLMN;
ii) It should not be "barred" (see subclause 3.5.1);
iii) It should not be in an LA which is in the list of "forbidden LAs for roaming";
iv) The radio path loss between MS and BTS must be below a threshold set by the PLMN operator. This is
estimated as shown in subclause 3.6;
v) It should not be a SoLSA exclusive cell to which MS does not subscribe. This requirement is only valid for MSs
supporting SoLSA.
Initially, the MS looks for a cell which satisfies these 5 constraints ("suitable cell") by checking cells in descending
order of received signal strength. If a suitable cell is found, the MS camps on it and performs any registration necessary.
Cells can have two levels of priority, suitable cells which are of low priority are only camped on if there are no other
suitable cells of normal priority. (This is called "cell selection").
When camped on a cell the MS regularly looks to see if there is a better cell in terms of a cell re-selection criterion, and
if there is, the better cell is selected. Also if one of the other criteria changes, (e.g., the current serving cell becomes
barred), or there is a downlink signalling failure (see subclause 3.6), a new cell is selected. (This is called "cell
reselection"). A MS that has enabled PEO or EC operation has relaxed requirements for how often it verifies the
suitability of its serving cell and the suitability of neighbour cells for re-selection (see 3GPP TS 45.008 [25] and 3GPP
TS 44.018 [23]).
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3GPP TS 43.022 version 13.1.0 Release 13 10 ETSI TS 143 022 V13.1.0 (2016-08)
In order to speed up these processes, a list of the RF channels containing BCCH or CPBCCH carriers of the same
PLMN is broadcast in the system information messages, see subclause 4.8. Also, the MS does not need to search all
possible RF channels to find a suitable cell. If, after searching the number of RF channels, given for each frequency
band below, with the strongest received signal level, a BCCH or CPBCCH carrier has been found but no suitable cell of
the selected PLMN has been found, the MS can stop the attempt to find a suitable cell of the selected PLMN.
The number of channels to be searched are 15 for T-GSM 380, 15 for T-GSM 410, 15 for GSM 450, 15 for GSM 480,
25 for GSM 710, 25 for GSM 750, 25 for T-GSM 810, 30 for GSM 850 Band, 30 for GSM 900, 15 for T-GSM 900 and
40 for DCS 1800 and PCS 1900.
3.2.2 "Camp on any cell"
If the MS cannot find a suitable cell, it attempts to camp on any acceptable cell and enter a "limited service state", as
defined in subclause 3.7. An MS attempting to camp on any acceptable cell shall not scan for CPBCCH.
There are various requirements that a cell must satisfy before being considered an acceptable cell to be camped on in
"limited service state":
i) It should not be "barred" (see subclause 3.5.1);
ii) The radio path loss between MS and BTS must be below a threshold set by the PLMN operator. This is
estimated as shown in subclause 3.6.
3.3 Regional provision of service
See 3GPP TS 23.122.
3.4 Borders between registration areas
If the MS is moving in a border area between registration areas, it might repeatedly change between cells of different
registration areas. Each change of registration area would require an LR, which would cause a heavy signalling load and
increase the risk of a paging message being lost. To prevent this, a "CELL_RESELECT_HYSTERESIS" (CRH)
parameter is used. A cell in a different registration area is only selected if it is "better", in terms of the path loss criterion
(see subclause 3.6), than all the cells in the current registration area by at least the value of CRH. The CRH parameter is
broadcast as system information. As the value of CRH broadcast may be different on different cells, the CRH parameter
to be used is that broadcast on the current serving cell. There is also a lower limit on the time interval between
reselection of cells on different registration areas. Instead of CRH a GPRS MS uses a
"GPRS_CELL_RESELECT_HYSTERESIS" if provided.
3.5 Barred cells and access control
3.5.1 Barred cells
The PLMN operator may decide not to allow MSs to camp on certain cells. (These cells may, for example, only be used
for hand over traffic, i.e. calls which need to be handed over to other cells). Barred cell information is broadcast as
system information to instruct MSs not to camp on these cells. The barred cell status may in fact change dynamically;
hence the MS needs to regularly check the system informati
...