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TS 23.122CT1
Non-Access-Stratum (NAS) functions
related to Mobile Station in Idle Mode

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for a better overview, the Table of Contents (ToC) is reproduced
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V15.7.0 (PDF)  2019/03  67 p.
V14.5.0  2018/06  56 p.
V13.6.0  2016/09  52 p.
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V6.5.0  2005/06  36 p.
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Rapporteur:  Mr. Herrero-Veron, ChristianHuawei Technologies Co. Ltd.

This TS gives an overview of the tasks undertaken by the Core network protocols of a Mobile Station (MS) when in idle mode, that is, switched on but typically 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.
When an MS is switched on, it attempts to make contact with a public land mobile network (PLMN). The particular PLMN to be contacted may be selected either automatically or manually.
The MS looks for a suitable cell of the chosen PLMN and chooses that cell to provide available services, and tunes to its control channel. This choosing is known as "camping on the cell". The MS will then register its presence in the registration area of the chosen cell if necessary, by means of a location registration (LR), GPRS attach, IMSI attach or registration procedure.
If the MS loses coverage of a cell, or find a more suitable cell, it reselects onto the most suitable cell of the selected PLMN and camps on that cell. If the new cell is in a different registration area, an LR request is performed.

full Table of Contents for  TS 23.122  Word version:   16.5.0

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1  ScopeWord-p. 6
2  General description of idle modeWord-p. 13
3  Requirements and technical solutionsWord-p. 14
4  Overall process structureUp
4.1  Process goal
4.2  States descriptionWord-p. 27
4.3  List of states
4.4  PLMN selection processWord-p. 29
4.5  Location registration processUp
4.6  Service indication (A/Gb mode only)
4.7  Pageability of the mobile subscriber
4.8  MM Restart Procedure
4.9  SNPN selection process [R16]Word-p. 45
5  Tables and FiguresWord-p. 50
6  MS supporting access technologies defined both by 3GPP and 3GPP2 [R8]Word-p. 56
A (Normative)  HPLMN Matching CriteriaWord-p. 58
B (Normative)  PLMN matching criteria to be of same country as VPLMNWord-p. 62
C (Normative)  Control plane solution for steering of roaming in 5GS [R15]Word-p. 63
D  Change historyWord-p. 72

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