ETSI TS 138 305 V15.5.0 (2020-01)

5G; NG Radio Access Network (NG-RAN); Stage 2 functional specification of User Equipment (UE) positioning in NG-RAN (3GPP TS 38.305 version 15.5.0 Release 15)

RTS/TSGR-0238305vf50

General Information

• Status: Published
• Publication Date: 16-Jan-2020
• Technical Committee: 3GPP RAN 2 - Radio layer 2 specification and Radio layer 3 RR specification
• Current Stage: 12 - Completion
• Completion Date: 17-Jan-2020

Standards Content (Sample)

TECHNICAL SPECIFICATION
5G;
NG Radio Access Network (NG-RAN);
Stage 2 functional specification of User Equipment (UE)
positioning in NG-RAN
(3GPP TS 38.305 version 15.5.0 Release 15)

3GPP TS 38.305 version 15.5.0 Release 15 1 ETSI TS 138 305 V15.5.0 (2020-01)

Reference
RTS/TSGR-0238305vf50
Keywords
5G
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ETSI
3GPP TS 38.305 version 15.5.0 Release 15 2 ETSI TS 138 305 V15.5.0 (2020-01)
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ETSI
3GPP TS 38.305 version 15.5.0 Release 15 3 ETSI TS 138 305 V15.5.0 (2020-01)
Contents
Intellectual Property Rights . 2
Legal Notice . 2
Modal verbs terminology . 2
Foreword . 8
1 Scope . 9
2 References . 9
3 Definitions, symbols and abbreviations . 10
3.1 Definitions . 10
3.2 Abbreviations . 11
4 Main concepts and requirements . 12
4.1 Assumptions and Generalities . 12
4.2 Role of UE Positioning Methods . 13
4.3 Standard UE Positioning Methods . 13
4.3.1 Introduction. 13
4.3.2 Network-assisted GNSS methods . 14
4.3.3 OTDOA positioning . 14
4.3.4 Enhanced Cell ID methods . 14
4.3.5 Barometric pressure sensor positioning . 15
4.3.6 WLAN positioning . 15
4.3.7 Bluetooth positioning . 15
4.3.8 TBS positioning . 15
4.3.9 Motion sensor positioning . 15
5 NG-RAN UE Positioning Architecture . 16
5.1 Architecture . 16
5.2 UE Positioning Operations . 17
5.3 NG-RAN Positioning Operations . 18
5.3.1 General NG-RAN Positioning Operations . 18
5.3.2 OTDOA Positioning Support . 18
5.4 Functional Description of Elements Related to UE Positioning in NG-RAN . 18
5.4.1 User Equipment (UE) . 18
5.4.2 gNB . 18
5.4.3 ng-eNB . 18
5.4.4 Location Management Function (LMF) . 19
6 Signalling protocols and interfaces . 19
6.1 Network interfaces supporting positioning operations . 19
6.1.1 General LCS control plane architecture . 19
6.1.2 NR-Uu interface . 19
6.1.3 LTE-Uu interface . 19
6.1.4 NG-C interface . 19
6.1.5 NLs interface . 20
6.2 UE-terminated protocols . 20
6.2.1 LTE Positioning Protocol (LPP) . 20
6.2.2 Radio Resource Control (RRC) for NR . 20
6.2.3 Radio Resource Control (RRC) for LTE . 20
6.3 NG-RAN Node terminated protocols . 20
6.3.1 NR Positioning Protocol A (NRPPa) . 20
6.3.2 NG Application Protocol (NGAP) . 21
6.4 Signalling between an LMF and UE . 21
6.4.1 Protocol Layering . 21
6.4.2 LPP PDU Transfer . 21
6.5 Signalling between an LMF and NG-RAN node . 23
6.5.1 Protocol Layering . 23
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6.5.2 NRPPa PDU Transfer for UE Positioning . 23
6.5.3 NRPPa PDU Transfer for Positioning Support . 24
6.6 Void . 25
7 General NG-RAN UE Positioning procedures . 25
7.1 General LPP procedures for UE Positioning . 25
7.1.1 LPP procedures . 25
7.1.2 Positioning procedures . 26
7.1.2.1 Capability transfer . 26
7.1.2.2 Assistance data transfer . 26
7.1.2.3 Location information transfer. 26
7.1.2.4 Multiple transactions . 26
7.1.2.5 Sequence of procedures . 26
7.1.2.6 Error handling . 26
7.1.2.7 Abort . 26
7.2 General NRPPa Procedures for UE Positioning . 27
7.2.1 NRPPa procedures . 27
7.2.2 NRPPa transaction types . 27
7.2.2.1 Location information transfer. 27
7.3 Service Layer Support using combined LPP and NRPPa Procedures . 28
7.3.1 General . 28
7.3.2 NI-LR and MT-LR Service Support . 28
7.4 General RRC procedures for UE Positioning . 29
7.4.1 NR RRC Procedures . 29
7.4.1.1 Location Measurement Indication . 29
7.4.2 LTE RRC Procedures . 29
7.4.2.1 Inter-frequency RSTD measurement indication . 30
8 Positioning methods and Supporting Procedures . 30
8.1 GNSS positioning methods . 30
8.1.1 General . 30
8.1.2 Information to be transferred between NG-RAN/5GC Elements . 31
8.1.2.1 Information that may be transferred from the LMF to UE . 31
8.1.2.1.1 Reference Time . 32
8.1.2.1.2 Reference Location . 32
8.1.2.1.3 Ionospheric Models . 32
8.1.2.1.4 Earth Orientation Parameters . 32
8.1.2.1.5 GNSS-GNSS Time Offsets . 32
8.1.2.1.6 Differential GNSS Corrections . 33
8.1.2.1.7 Ephemeris and Clock Models . 33
8.1.2.1.8 Real-Time Integrity . 33
8.1.2.1.9 Data Bit Assistance . 33
8.1.2.1.10 Acquisition Assistance . 33
8.1.2.1.11 Almanac. 33
8.1.2.1.12 UTC Models . 33
8.1.2.1.13 RTK Reference Station Information . 33
8.1.2.1.14 RTK Auxiliary Station Data . 33
8.1.2.1.15 RTK Observations . 34
8.1.2.1.16 RTK Common Observation Information . 34
8.1.2.1.17 GLONASS RTK Bias Information . 34
8.1.2.1.18 RTK MAC Correction Differences . 34
8.1.2.1.19 RTK Residuals . 34
8.1.2.1.20 RTK FKP Gradients . 34
8.1.2.1.21 SSR Orbit Corrections . 35
8.1.2.1.22 SSR Clock Corrections . 35
8.1.2.1.23 SSR Code Bias . 35
8.1.2.1a Recommendations for grouping of assistance data to support different RTK service levels . 35
8.1.2.2 Information that may be transferred from the UE to LMF . 37
8.1.2.2.1 GNSS Measurement Information . 37
8.1.2.2.1.1 UE-based mode . 37
8.1.2.2.1.2 UE-assisted mode . 38
8.1.2.2.2 Additional Non-GNSS Related Information. 38
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8.1.3 Assisted-GNSS Positioning Procedures. 38
8.1.3.1 Capability Transfer Procedure . 38
8.1.3.2 Assistance Data Transfer Procedure. 38
8.1.3.2.1 LMF initiated Assistance Data Delivery . 38
8.1.3.2.1a LMF initiated Periodic Assistance Data Delivery . 39
8.1.3.2.2 UE initiated Assistance Data Transfer . 39
8.1.3.2.2a UE initiated Periodic Assistance Data Transfer . 40
8.1.3.3 Location Information Transfer Procedure . 41
8.1.3.3.1 LMF initiated Location Information Transfer Procedure . 41
8.1.3.3.2 UE-initiated Location Information Delivery Procedure . 42
8.2 OTDOA positioning . 42
8.2.1 General . 42
8.2.2 Information to be transferred between NG-RAN/5GC Elements . 43
8.2.2.1 Information that may be transferred from the LMF to UE . 43
8.2.2.2 Information that may be transferred from the ng-eNB to LMF. 43
8.2.2.3 Information that may be transferred from the UE to LMF . 43
8.2.3 OTDOA Positioning Procedures . 44
8.2.3.1 Capability Transfer Procedure . 44
8.2.3.2 Assistance Data Transfer Procedure. 44
8.2.3.2.1 Assistance Data Transfer between LMF and UE . 44
8.2.3.2.1.1 LMF initiated Assistance Data Delivery . 44
8.2.3.2.1.2 UE initiated Assistance Data Transfer . 44
8.2.3.2.2 Assistance Data Delivery between LMF and ng-eNB . 45
8.2.3.2.2.1 LMF-initiated assistance data delivery to the LMF . 45
8.2.3.3 Location Information Transfer Procedure . 46
8.2.3.3.1 LMF-initiated Location Information Transfer Procedure . 46
8.2.3.3.2 UE-initiated Location Information Delivery procedure . 46
8.3 Enhanced cell ID positioning methods . 47
8.3.1 General . 47
8.3.2 Information to be transferred between NG-RAN/5GC Elements . 47
8.3.2.1 Information that may be transferred from the LMF to UE . 47
8.3.2.2 Information that may be transferred from the ng-eNB to LMF. 47
8.3.2.3 Information that may be transferred from the gNB to LMF . 48
8.3.2.4 Information that may be transferred from the UE to LMF . 48
8.3.3 Downlink E-CID Positioning Procedures . 48
8.3.3.1 Capability Transfer Procedure . 49
8.3.3.2 Assistance Data Transfer Procedure. 49
8.3.3.3 Location Information Transfer Procedure . 49
8.3.3.3.1 LMF-initiated Location Information Transfer . 49
8.3.3.3.2 UE-initiated Location Information Delivery procedure . 49
8.3.4 Uplink E-CID Positioning Procedures . 50
8.3.4.1 Capability Transfer Procedure . 50
8.3.4.2 Assistance Data Transfer Procedure. 50
8.3.4.3 Position Measurement Procedure . 50
8.3.4.3.1 LMF-initiated Position Measurement . 50
8.4 Barometric pressure sensor positioning . 51
8.4.2 Information to be transferred between NG-RAN/5GC Elements . 52
8.4.2.1 Information that may be transferred from the LMF to UE . 52
8.4.2.1.1 Barometric pressure sensor assistance data . 52
8.4.2.2 Information that may be transferred from the UE to LMF . 52
8.4.2.2.1 Standalone mode . 52
8.4.2.2.2 UE-assisted mode . 52
8.4.2.2.3 UE-based mode . 52
8.4.3 Barometric Pressure Sensor Positioning Procedures . 53
8.4.3.1 Capability Transfer Procedure . 53
8.4.3.2 Assistance Data Transfer Procedure. 53
8.4.3.2.1 LMF initiated Assistance Data Delivery . 53
8.4.3.2.2 UE initiated Assistance Data Transfer . 53
8.4.3.3 Location Information Transfer Procedure . 54
8.4.3.3.1 LMF initiated Location Information Transfer Procedure . 54
8.4.3.3.2 UE-initiated Location Information Delivery Procedure . 54
8.5 WLAN positioning . 55
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8.5.1 General . 55
8.5.2 Information to be transferred between NG-RAN/5GC Elements . 55
8.5.2.1 Information that may be transferred from the LMF to UE . 55
8.5.2.1.1 WLAN AP BSSID . 55
8.5.2.1.2 WLAN AP SSID . 56
8.5.2.1.3 WLAN AP Type Data . 56
8.5.2.1.4 WLAN AP Location . 56
8.5.2.2 Information that may be transferred from the UE to LMF . 56
8.5.2.2.1 Standalone mode . 56
8.5.2.2.2 UE-assisted mode . 56
8.5.2.2.3 UE-based mode . 56
8.5.3 WLAN Positioning Procedures . 57
8.5.3.1 Capability Transfer Procedure . 57
8.5.3.2 Assistance Data Transfer Procedure. 57
8.5.3.2.1 LMF initiated Assistance Data Delivery . 57
8.5.3.2.2 UE initiated Assistance Data Transfer . 57
8.5.3.3 Location Information Transfer Procedure . 58
8.5.3.3.1 LMF initiated Location Information Transfer Procedure . 58
8.5.3.3.2 UE-initiated Location Information Delivery Procedure . 58
8.6 Bluetooth positioning . 59
8.6.2 Information to be transferred between NG-RAN/5GC Elements . 59
8.6.2.1 Information that may be transferred from the LMF to UE . 59
8.6.2.2 Information that may be transferred from the UE to LMF . 59
8.6.2.2.1 Standalone mode . 59
8.6.2.2.2 UE-assisted mode . 60
8.6.3 Bluetooth Positioning Procedures . 60
8.6.3.1 Capability Transfer Procedure . 60
8.6.3.2 Assistance Data Transfer Procedure. 60
8.6.3.3 Location Information Transfer Procedure . 60
8.6.3.3.1 LMF initiated Location Information Transfer Procedure . 60
8.6.3.3.2 UE-initiated Location Information Delivery Procedure . 60
8.7 TBS positioning . 61
8.7.1 General . 61
8.7.2 Information to be transferred between NG-RAN/5GC Elements . 61
8.7.2.1 Information that may be transferred from the LMF to UE . 61
8.7.2.1.1 Acquisition Assistance . 62
8.7.2.1.2 Almanac. 62
8.7.2.2 Information that may be transferred from the UE to LMF . 62
8.7.2.2.1 Standalone mode . 62
8.7.2.2.2 UE-assisted mode . 62
8.7.2.2.3 UE-based mode . 62
8.7.3 TBS Positioning Procedures . 62
8.7.3.1 Capability Transfer Procedure . 62
8.7.3.2 Assistance Data Transfer Procedure. 62
8.7.3.2.1 LMF initiated Assistance Data Delivery . 63
8.7.3.2.2 UE initiated Assistance Data Transfer . 63
8.7.3.3 Location Information Transfer Procedure . 63
8.7.3.3.1 LMF initiated Location Information Transfer Procedure . 64
8.7.3.3.2 UE-initiated Location Information Delivery Procedure . 64
8.8 Motion sensor positioning method . 64
8.8.1 General . 64
8.8.2 Information to be transferred between NG-RAN/5GC Elements . 65
8.8.2.1 General . 65
8.8.2.2 Information that may be transferred from the UE to LMF . 65
8.8.2.2.1 UE-assisted, UE-based, Standalone mode . 65
8.8.2.2.2 UE Displacement and Movement Information . 65
8.8.2.3 Information that may be transferred from the LMF to the UE . 65
8.8.3 Motion Sensors Location Information Transfer Procedure . 65
8.8.3.1 General . 65
8.8.3.2 LMF initiated Location Information Transfer Procedure . 65
8.8.3.3 UE-initiated Location Information Delivery Procedure . 66
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Annex A (informative): Use of LPP with SUPL . 67
A.1 SUPL 2.0 Positioning Methods and Positioning Protocols . 67
A.2 SUPL 2.0 and NR Architecture . 68
A.3 LPP session procedures using SUPL . 69
A.4 Procedures combining C-plane and U-plane operations . 70
Annex B (informative): Change history . 72
History . 73

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3GPP TS 38.305 version 15.5.0 Release 15 8 ETSI TS 138 305 V15.5.0 (2020-01)
Foreword
This Technical Specification has been produced by the 3rd 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
3GPP TS 38.305 version 15.5.0 Release 15 9 ETSI TS 138 305 V15.5.0 (2020-01)
1 Scope
The present document specifies the stage 2 of the UE Positioning function of NG-RAN which provides the mechanisms
to support or assist the calculation of the geographical position of a UE. UE position knowledge can be used, for
example, in support of Radio Resource Management functions, as well as location-based services for operators,
subscribers, and third-party service providers. The purpose of this stage 2 specification is to define the NG-RAN UE
Positioning architecture, functional entities and operations to support positioning methods. This description is confined
to the NG-RAN Access Stratum. It does not define or describe how the results of the UE position calculation can be
utilised in the Core Network (e.g., LCS) or in NG-RAN (e.g., RRM).
UE Positioning may be considered as a network-provided enabling technology consisting of standardised service
capabilities that enable the provision of location applications. The application(s) may be service provider specific. The
description of the numerous and varied possible location applications which are enabled by this technology is outside
the scope of the present document. However, clarifying examples of how the functionality being described may be used
to provide specific location services may be included.
This stage 2 specification covers the NG-RAN positioning methods, state descriptions, and message flows to support
UE Positioning.
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.
[1] 3GPP TR 21.905: "Vocabulary for 3GPP Specifications".
[2] 3GPP T
...