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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 17.3.0 Release 17)
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3GPP TS 38.305 version 17.3.0 Release 17 1 ETSI TS 138 305 V17.3.0 (2023-01)
Reference
RTS/TSGR-0238305vh30
Keywords
5G
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3GPP TS 38.305 version 17.3.0 Release 17 2 ETSI TS 138 305 V17.3.0 (2023-01)
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3GPP TS 38.305 version 17.3.0 Release 17 3 ETSI TS 138 305 V17.3.0 (2023-01)
Contents
Intellectual Property Rights . 2
Legal Notice . 2
Modal verbs terminology . 2
Foreword . 10
1 Scope . 11
2 References . 11
3 Definitions, symbols and abbreviations . 13
3.1 Definitions . 13
3.2 Abbreviations . 14
4 Main concepts and requirements . 16
4.1 Assumptions and Generalities . 16
4.2 Role of UE Positioning Methods . 17
4.3 Standard UE Positioning Methods . 17
4.3.1 Introduction. 17
4.3.2 Network-assisted GNSS methods . 18
4.3.3 OTDOA positioning . 19
4.3.4 Enhanced Cell ID methods . 19
4.3.5 Barometric pressure sensor positioning . 19
4.3.6 WLAN positioning . 19
4.3.7 Bluetooth positioning . 20
4.3.8 TBS positioning . 20
4.3.9 Motion sensor positioning . 20
4.3.10 NR Enhanced Cell ID methods . 20
4.3.11 Multi-RTT positioning . 20
4.3.12 DL-AoD positioning . 21
4.3.13 DL-TDOA positioning . 21
4.3.14 UL-TDOA positioning . 21
4.3.15 UL-AoA . 21
5 NG-RAN UE Positioning Architecture . 21
5.1 Architecture . 21
5.2 UE Positioning Operations . 22
5.3 NG-RAN Positioning Operations . 24
5.3.1 General NG-RAN Positioning Operations . 24
5.3.2 OTDOA Positioning Support . 24
5.3.3 Assistance Information Broadcast Support . 24
5.3.4 NR RAT-Dependent Positioning Support . 24
5.4 Functional Description of Elements Related to UE Positioning in NG-RAN . 24
5.4.1 User Equipment (UE) . 24
5.4.2 gNB . 25
5.4.3 ng-eNB . 25
5.4.4 Location Management Function (LMF) . 25
5.4.5 Positioning Reference Unit (PRU) . 26
6 Signalling protocols and interfaces . 26
6.1 Network interfaces supporting positioning operations . 26
6.1.1 General LCS control plane architecture . 26
6.1.2 NR-Uu interface . 26
6.1.3 LTE-Uu interface . 26
6.1.4 NG-C interface . 26
6.1.5 NL1 interface . 26
6.1.6 F1 interface . 27
6.2 UE-terminated protocols . 27
6.2.1 LTE Positioning Protocol (LPP) . 27
ETSI
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3GPP TS 38.305 version 17.3.0 Release 17 4 ETSI TS 138 305 V17.3.0 (2023-01)
6.2.2 Radio Resource Control (RRC) for NR . 27
6.2.3 Radio Resource Control (RRC) for LTE . 27
6.2.4 Medium Access Control (MAC) for NR. 28
6.3 NG-RAN Node terminated protocols . 28
6.3.1 NR Positioning Protocol A (NRPPa) . 28
6.3.2 NG Application Protocol (NGAP) . 28
6.4 Signalling between an LMF and UE . 28
6.4.1 Protocol Layering . 28
6.4.2 LPP PDU Transfer . 29
6.5 Signalling between an LMF and NG-RAN node . 31
6.5.1 Protocol Layering . 31
6.5.2 NRPPa PDU Transfer for UE Positioning . 31
6.5.3 NRPPa PDU Transfer for Positioning Support . 32
6.5.4 NRPPa PDU Transfer for Assistance Information Broadcast . 33
6.6 Void . 35
7 General NG-RAN UE Positioning procedures . 35
7.1 General LPP procedures for UE Positioning . 35
7.1.1 LPP procedures . 35
7.1.2 Positioning procedures . 35
7.1.2.1 Capability transfer . 35
7.1.2.2 Assistance data transfer . 35
7.1.2.3 Location information transfer. 35
7.1.2.4 Multiple transactions . 35
7.1.2.5 Sequence of procedures . 35
7.1.2.6 Error handling . 36
7.1.2.7 Abort . 36
7.1.3 UE positioning measurements in RRC_IDLE state for NB-IoT . 36
7.2 General NRPPa Procedures for UE Positioning . 37
7.2.1 NRPPa procedures . 37
7.2.2 NRPPa transaction types . 38
7.2.2.1 Location information transfer. 38
7.3 Service Layer Support using combined LPP and NRPPa Procedures . 38
7.3.1 General . 38
7.3.2 NI-LR and MT-LR Service Support . 38
7.3.3 MO-LR Service Support . 39
7.3.4 Deferred MT-LR Event Reporting Support . 40
7.4 General RRC procedures for UE Positioning . 41
7.4.1 NR RRC Procedures . 41
7.4.1.1 Location Measurement Indication . 41
7.4.1.2 UE Positioning Assistance Information . 42
7.4.2 LTE RRC Procedures . 43
7.4.2.1 Inter-frequency RSTD measurement indication . 43
7.5 Procedures for Broadcast of Assistance Data . 43
7.5.1 General . 43
7.5.2 Broadcast Procedures . 43
7.6 Procedures for On-Demand PRS transmission . 45
7.6.1 General . 45
7.6.2 On-Demand PRS transmission procedures . 45
7.7 Procedures for Pre-configured Measurement Gap . 47
7.7.1 General . 47
7.7.2 Pre-configured Measurement Gap procedures . 47
7.8 Procedures for Pre-configured PRS processing window . 48
7.8.1 General . 48
7.8.2 Pre-configured PRS processing window procedures . 48
7.9 Positioning in RRC_INACTIVE state . 49
8 Positioning methods and Supporting Procedures . 49
8.1 GNSS positioning methods . 49
8.1.1 General . 49
8.1.2 Information to be transferred between NG-RAN/5GC Elements . 52
8.1.2.1 Information that may be transferred from the LMF to UE . 52
ETSI
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3GPP TS 38.305 version 17.3.0 Release 17 5 ETSI TS 138 305 V17.3.0 (2023-01)
8.1.2.1.1 Reference Time . 52
8.1.2.1.2 Reference Location . 53
8.1.2.1.3 Ionospheric Models . 53
8.1.2.1.4 Earth Orientation Parameters . 53
8.1.2.1.5 GNSS-GNSS Time Offsets . 53
8.1.2.1.6 Differential GNSS Corrections . 53
8.1.2.1.7 Ephemeris and Clock Models . 53
8.1.2.1.8 Real-Time Integrity . 53
8.1.2.1.9 Data Bit Assistance . 53
8.1.2.1.10 Acquisition Assistance . 54
8.1.2.1.11 Almanac. 54
8.1.2.1.12 UTC Models . 54
8.1.2.1.13 RTK Reference Station Information . 54
8.1.2.1.14 RTK Auxiliary Station Data . 54
8.1.2.1.15 RTK Observations . 54
8.1.2.1.16 RTK Common Observation Information . 55
8.1.2.1.17 GLONASS RTK Bias Information . 55
8.1.2.1.18 RTK MAC Correction Differences . 55
8.1.2.1.19 RTK Residuals . 55
8.1.2.1.20 RTK FKP Gradients . 55
8.1.2.1.21 SSR Orbit Corrections . 55
8.1.2.1.22 SSR Clock Corrections . 56
8.1.2.1.23 SSR Code Bias . 56
8.1.2.1.24 SSR Phase Bias . 56
8.1.2.1.25 SSR STEC Corrections . 56
8.1.2.1.26 SSR Gridded Correction . 56
8.1.2.1.27 SSR URA . 57
8.1.2.1.28 SSR Correction Points . 57
8.1.2.1.29 Integrity Service Parameters . 57
8.1.2.1.30 Integrity Alerts. 57
8.1.2.1a Recommendations for grouping of assistance data to support different RTK service levels . 57
8.1.2.1b Mapping of integrity parameters . 59
8.1.2.2 Information that may be transferred from the UE to LMF . 62
8.1.2.2.1 GNSS Measurement Information . 62
8.1.2.2.1.1 UE-based mode . 62
8.1.2.2.1.2 UE-assisted mode . 62
8.1.2.2.2 Additional Non-GNSS Related Information. 62
8.1.3 Assisted-GNSS Positioning Procedures.
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