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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 15.2.0 Release 15)
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3GPP TS 38.305 version 15.2.0 Release 15 1 ETSI TS 138 305 V15.2.0 (2019-04)
Reference
RTS/TSGR-0238305vf20
Keywords
5G
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3GPP TS 38.305 version 15.2.0 Release 15 2 ETSI TS 138 305 V15.2.0 (2019-04)
Intellectual Property Rights
Essential patents
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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
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Modal verbs terminology
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"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 38.305 version 15.2.0 Release 15 3 ETSI TS 138 305 V15.2.0 (2019-04)
Contents
Intellectual Property Rights . 2
Foreword . 2
Modal verbs terminology . 2
Foreword . 7
1 Scope . 8
2 References . 8
3 Definitions, symbols and abbreviations . 9
3.1 Definitions . 9
3.2 Abbreviations . 10
4 Main concepts and requirements . 11
4.1 Assumptions and Generalities . 11
4.2 Role of UE Positioning Methods . 12
4.3 Standard UE Positioning Methods . 12
4.3.1 Introduction. 12
4.3.2 Network-assisted GNSS methods . 13
4.3.3 OTDOA positioning . 13
4.3.4 Enhanced Cell ID methods . 13
4.3.5 Barometric pressure sensor positioning . 14
4.3.6 WLAN positioning . 14
4.3.7 Bluetooth positioning . 14
4.3.8 TBS positioning . 14
5 NG-RAN UE Positioning Architecture . 14
5.1 Architecture . 14
5.2 UE Positioning Operations . 15
5.3 NG-RAN Positioning Operations . 17
5.3.1 General NG-RAN Positioning Operations . 17
5.3.2 OTDOA Positioning Support . 17
5.4 Functional Description of Elements Related to UE Positioning in NG-RAN . 17
5.4.1 User Equipment (UE) . 17
5.4.2 gNB . 17
5.4.3 ng-eNB . 17
5.4.4 Location Management Function (LMF) . 17
6 Signalling protocols and interfaces . 18
6.1 Network interfaces supporting positioning operations . 18
6.1.1 General LCS control plane architecture . 18
6.1.2 NR-Uu interface . 18
6.1.3 LTE-Uu interface . 18
6.1.4 NG-C interface . 18
6.1.5 NLs interface . 18
6.2 UE-terminated protocols . 18
6.2.1 LTE Positioning Protocol (LPP) . 18
6.2.2 Radio Resource Control (RRC) for NR . 19
6.2.3 Radio Resource Control (RRC) for LTE . 19
6.3 NG-RAN Node terminated protocols . 19
6.3.1 NR Positioning Protocol A (NRPPa) . 19
6.3.2 NG Application Protocol (NGAP) . 19
6.4 Signalling between an LMF and UE . 19
6.4.1 Protocol Layering . 19
6.4.2 LPP PDU Transfer . 20
6.5 Signalling between an LMF and NG-RAN node . 22
6.5.1 Protocol Layering . 22
6.5.2 NRPPa PDU Transfer for UE Positioning . 22
6.5.3 NRPPa PDU Transfer for Positioning Support . 23
ETSI
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3GPP TS 38.305 version 15.2.0 Release 15 4 ETSI TS 138 305 V15.2.0 (2019-04)
6.6 Void . 24
7 General NG-RAN UE Positioning procedures . 24
7.1 General LPP procedures for UE Positioning . 24
7.1.1 LPP procedures . 24
7.1.2 Positioning procedures . 25
7.1.2.1 Capability transfer . 25
7.1.2.2 Assistance data transfer . 25
7.1.2.3 Location information transfer. 25
7.1.2.4 Multiple transactions . 25
7.1.2.5 Sequence of procedures . 25
7.1.2.6 Error handling . 25
7.1.2.7 Abort . 25
7.2 General NRPPa Procedures for UE Positioning . 25
7.2.1 NRPPa procedures . 25
7.2.2 NRPPa transaction types . 26
7.2.2.1 Location information transfer. 26
7.3 Service Layer Support using combined LPP and NRPPa Procedures . 27
7.3.1 General . 27
7.3.2 NI-LR and MT-LR Service Support . 27
7.4 General RRC procedures for UE Positioning . 27
7.4.1 NR RRC Procedures . 27
7.4.1.1 Location Measurement Indication . 27
7.4.2 LTE RRC Procedures . 28
7.4.2.1 Inter-frequency RSTD measurement indication . 28
8 Positioning methods and Supporting Procedures . 29
8.1 GNSS positioning methods . 29
8.1.1 General . 29
8.1.2 Information to be transferred between NG-RAN/5GC Elements . 30
8.1.2.1 Information that may be transferred from the LMF to UE . 30
8.1.2.1.1 Reference Time . 30
8.1.2.1.2 Reference Location . 31
8.1.2.1.3 Ionospheric Models . 31
8.1.2.1.4 Earth Orientation Parameters . 31
8.1.2.1.5 GNSS-GNSS Time Offsets . 31
8.1.2.1.6 Differential GNSS Corrections . 31
8.1.2.1.7 Ephemeris and Clock Models . 31
8.1.2.1.8 Real-Time Integrity . 31
8.1.2.1.9 Data Bit Assistance . 31
8.1.2.1.10 Acquisition Assistance . 31
8.1.2.1.11 Almanac. 31
8.1.2.1.12 UTC Models . 31
8.1.2.1.13 RTK Reference Station Information . 32
8.1.2.1.14 RTK Auxiliary Station Data . 32
8.1.2.1.15 RTK Observations . 32
8.1.2.1.16 RTK Common Observation Information . 32
8.1.2.1.17 GLONASS RTK Bias Information . 32
8.1.2.1.18 RTK MAC Correction Differences . 32
8.1.2.1.19 RTK Residuals . 32
8.1.2.1.20 RTK FKP Gradients . 33
8.1.2.1.21 SSR Orbit Corrections . 33
8.1.2.1.22 SSR Clock Corrections . 33
8.1.2.1.23 SSR Code Bias . 33
8.1.2.1a Recommendations for grouping of assistance data to support different RTK service levels . 33
8.1.2.2 Information that may be transferred from the UE to LMF . 35
8.1.2.2.1 GNSS Measurement Information . 35
8.1.2.2.1.1 UE-based mode . 35
8.1.2.2.1.2 UE-assisted mode . 36
8.1.2.2.2 Additional Non-GNSS Related Information. 36
8.1.3 Assisted-GNSS Positioning Procedures. 36
8.1.3.1 Capability Transfer Procedure . 36
ETSI
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3GPP TS 38.305 version 15.2.0 Release 15 5 ETSI TS 138 305 V15.2.0 (2019-04)
8.1.3.2 Assistance Data Transfer Procedure. 36
8.1.3.2.1 LMF initiated Assistance Data Delivery . 36
8.1.3.2.1a LMF initiated Periodic Assistance Data Delivery . 37
8.1.3.2.2 UE initiated Assistance Data Transfer . 37
8.1.3.2.2a UE initiated Periodic Assistance Data Transfer . 38
8.1.3.3 Location Information Transfer Procedure . 39
8.1.3.3.1 LMF initiated Location Information Transfer Procedure . 39
8.1.3.3.2 UE-initiated Location Information Delivery Procedure . 39
8.2 OTDOA positioning . 40
8.2.1 General . 40
8.2.2 Information to be transferred between NG-RAN/5GC Elements . 40
8.2.2.1 Information that may be transferred from the LMF to UE . 40
8.2.2.2 Information that may be transferred from the ng-eNB to LMF. 40
8.2.2.3 Information that may be transferred from the UE to LMF . 41
8.2.3 OTDOA Positioning Procedures . 41
8.2.3.1 Capability Transfer Procedure . 41
8.2.3.2 Assistance Data Transfer Procedure. 41
8.2.3.2.1 Assistance Data Transfer between LMF and UE . 41
8.2.3.2.1.1 LMF initiated Assistance Data Delivery . 41
8.2.3.2.1.2 UE initiated Assistance Data Transfer . 42
8.2.3.2.2 Assistance Data Delivery between LMF and ng-eNB . 42
8.2.3.2.2.1 LMF-initiated assistance data delivery to the LMF . 42
8.2.3.3 Location Information Transfer Procedure . 43
8.2.3.3.1 LMF-initiated Location Information Transfer Procedure . 43
8.2.3.3.2 UE-initiated Location Information Delivery procedure . 44
8.3 Enhanced cell ID positioning methods . 44
8.3.1 General . 44
8.3.2 Information to be transferred between NG-RAN/5GC Elements . 45
8.3.2.1 Information that may be transferred from the LMF to UE . 45
8.3.2.2 Information that may be transferred from the ng-eNB to LMF. 45
8.3.2.3 Information that may be transferred from the gNB to LMF . 45
8.3.2.4 Information that may be transferred from the UE to LMF . 46
8.3.3 Downlink E-CID Positioning Procedures . 46
8.3.3.1 Capability Transfer Procedure . 46
8.3.3.2 Assistance Data Transfer Procedure. 46
8.3.3.3 Location Information Transfer Procedure . 46
8.3.3.3.1 LMF-initiated Location Information Transfer . 46
8.3.3.3.2 UE-initiated Location Information Delivery procedure . 47
8.3.4 Uplink E-CID Positioning Procedures . 47
8.3.4.1 Capability Transfer Procedure . 47
8.3.4.2 Assistance Data Transfer Procedure. 47
8.3.4.3 Position Measurement Procedure . 47
8.3.4.3.1 LMF-initiated Position Measurement . 47
8.4 Barometric pressure sensor positioning . 48
8.4.2 Information to be transferred between NG-RAN/5GC Elements . 49
8.4.2.1 Information that may be transferred from the LMF to UE . 49
8.4.2.1.1 Barometric pressure sensor assistance data . 49
8.4.2.2 Information that may be transferred from the UE to LMF . 49
8.4.2.2.1 Standalone mode . 49
8.4.2.2.2 UE-assisted mode . 49
8.4.2.2.3 UE-based mode .
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