ETSI TS 143 059 V14.3.0 (2020-04)

ETSI TS 143 059 V14.3.0 (2020-04)






TECHNICAL SPECIFICATION
Digital cellular telecommunications system (Phase 2+) (GSM);
Functional stage 2 description of Location Services (LCS) in
GERAN
(3GPP TS 43.059 version 14.3.0 Release 14)

R
GLOBAL SYSTEM FOR
MOBILE COMMUNICATIONS

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3GPP TS 43.059 version 14.3.0 Release 14 1 ETSI TS 143 059 V14.3.0 (2020-04)



Reference
RTS/TSGR-0643059ve30
Keywords
GSM
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3GPP TS 43.059 version 14.3.0 Release 14 2 ETSI TS 143 059 V14.3.0 (2020-04)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables 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
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Modal verbs terminology
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provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
ETSI

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3GPP TS 43.059 version 14.3.0 Release 14 3 ETSI TS 143 059 V14.3.0 (2020-04)
Contents
Intellectual Property Rights . 2
Legal Notice . 2
Modal verbs terminology . 2
Foreword . 7
1 Scope . 8
2 References . 8
3 Definitions and abbreviations . 10
3.1 Definitions . 10
3.2 Abbreviations . 11
4 Main concepts . 12
4.1 Assumptions . 12
4.2 Standard LCS Methods . 12
4.2.1 Timing Advance . 12
4.2.2 Enhanced Observed Time Difference (E-OTD) positioning mechanism. 12
4.2.3 Global Navigation Satellite System (GNSS) based positioning mechanism . 12
4.2.4 Uplink Time Difference of Arrival (U-TDOA) positioning mechanism . 13
4.2.5 Multilateration Positioning Methods . 13
4.2.5.1 Multilateration Timing Advance . 13
4.2.5.2 Multilateration OTD. 13
5 GERAN LCS Architecture . 13
5.1 LCS Operations . 14
5.2 High-Level Functions . 15
5.2.1 Co-ordination, Measurement and Calculation Functions . 16
5.3 GERAN LCS Functional Entities . 17
5.3.1 Internal Client Group . 17
5.3.1.1 Internal GERAN Location Client Function (LCF) . 17
5.3.2 GERAN System Handling group . 17
5.3.2.1 GERAN Location System Control Function (LSCF) . 17
5.3.2.2 GERAN Location System Operations Function (LSOF) . 17
5.3.2.3 Location System Broadcast Function (LSBcF) . 17
5.3.3 Positioning group . 18
5.3.3.1 GERAN Position Radio Co-ordination Function (PRCF) . 18
5.3.3.2 GERAN Position Calculation Function (PCF) . 18
5.3.3.3 GERAN Position Signal Measurement Function (PSMF) . 19
5.3.3.4 GERAN Position Radio Resource Management (PRRM) . 19
5.4 Assignment of LCS Functional Entities to GERAN Elements . 19
5.5 Functional Description of GERAN LCS Network Elements . 19
5.5.1 BSC . 19
5.5.2 SMLC . 19
5.5.3 CBC . 20
5.5.4 LMU . 20
5.5.5 MS . 20
6 Signalling Protocols and Interfaces . 20
6.1 Protocol layering in A/Gb mode . 20
6.1.1 Generic Signalling Model . 20
6.1.2 Message Segmentation in A/Gb mode . 21
6.1.2.1 Network Level Segmentation . 21
6.1.2.2 Intermediate Level Segmentation . 22
6.1.2.3 RRLP Pseudo-Segmentation . 22
6.1.3 Signalling between an SMLC, MSC and BSC. 22
6.1.3a Signalling between an SMLC, SGSN and BSS . 22
6.1.4 Signaling between SMLC and MS . 23
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3GPP TS 43.059 version 14.3.0 Release 14 4 ETSI TS 143 059 V14.3.0 (2020-04)
6.1.5 SMLC Signalling to a Type A LMU . 24
6.1.5.1 Circuit Switched Signalling using an SDCCH . 24
6.1.5.2 Signalling using a TCH . 24
6.1.6 SMLC signalling to a Type B LMU . 25
6.1.7 SMLC Signalling to a peer SMLC . 26
6.2 Protocol layering in Iu mode . 26
6.2.1 Signalling between SMLC and MSC/SGSN . 26
6.2.2 Signalling between SMLC and MS . 27
6.2.3 SMLC signalling to a Type A LMU . 28
6.2.4 SMLC signalling to a Type B LMU . 28
6.2.5 SMLC signalling to a peer SMLC . 28
7 GERAN Network Location Procedures . 28
7.1 State description for SMLC . 28
7.1.1 SMLC States . 28
7.1.1.1 NULL State . 28
7.1.1.2 LOCATION State . 28
7.1.2 State Functionality . 29
7.1.2.1 State Transitions . 29
7.1.2.2 LOCATION Timer Function . 29
7.2 State Description for the BSC . 29
7.2.1 BSC States . 29
7.2.1.1 IDLE State. 29
7.2.1.2 LOCATION State . 29
7.2.2 State Functionality . 30
7.2.2.1 State Transitions . 30
7.2.2.2 LOCATION Timer Function . 30
7.3 Usage of SCCP Connection on the Lb interface in the CS domain in A/Gb mode . 30
7.3.1 SCCP Connection for positioning of a target MS . 30
7.3.2 SCCP connection to access a Type A LMU . 31
7.4 Usage of SCCP Connection on the Lb interface in the PS domain in A/Gb mode. 31
7.4.1 SCCP Connection for positioning of a target MS . 31
8 Common Procedures to Support Positioning . 32
8.1 Information Transfer between an SMLC and a Target MS in the CS Domain in A/Gb mode for E-OTD
and A-GNSS positioning methods . 32
8.1a Information Transfer between an SMLC and a Target MS in the PS Domain in A/Gb mode . 33
8.1b Information Transfer between an SMLC and a Target MS in Iu Mode . 34
8.2 Information Transfer between an SMLC and a BSC . 35
8.3 Common Procedures to Support Access to an LMU . 36
8.3.1 Location Update Procedure between an SMLC and a Type A LMU . 36
8.3.2 IMSI Detach Procedure between an SMLC and a Type A LMU . 36
8.3.3 LCS Information Transfer between an SMLC and a Type A LMU . 38
8.3.3.1 Information Transfer using an SDCCH. 38
8.3.3.2 Information Transfer using a TCH . 39
8.3.4 LCS Information Transfer between an SMLC and a Type B LMU . 40
8.4 Common Control Procedures for LMUs . 41
8.4.1 Reset Procedure . 41
8.4.2 Status Query Procedure . 41
8.4.3 Status Update Procedure . 42
8.5 Exception Procedures . 42
8.5.1 Procedures in the SMLC . 42
8.5.2 Procedures in an LMU . 43
8.5.3 Procedures in the BSC in the CS Domain . 43
8.5.3.1 General Procedures . 43
8.5.3.2 Rejection of an SMLC Positioning Request . 44
8.5.3.3 Interaction with Inter-BSC Handover . 44
8.5.3.4 Interaction with Intra-BSC Handover and other RR Management Procedures . 44
8.5.3.5 Priority of Handover and Other RR Management Procedures . 44
8.5.3.6 Interaction with Segmentation support for Legacy MS. 44
8.5.3.7 Overload . 45
8.5.4 Procedures in the BSS in the PS Domain . 45
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3GPP TS 43.059 version 14.3.0 Release 14 5 ETSI TS 143 059 V14.3.0 (2020-04)
8.5.4.1 General Procedures . 45
8.5.4.2 Rejection of an SMLC Positioning Request . 45
8.5.4.3 Overload . 45
8.5.4.4 Inter BSS Cell Change . 46
8.5.5 Void . 46
8.6 Procedures in the Target MS . 46
8.7 Further Procedures for Handover . 46
9 Positioning procedures . 46
9.1 Positioning Procedure Initiation . 46
9.1.1 Core Network Position Procedure Initiation over the A interface . 46
9.1.2 Positioning Procedure Initiation from an Internal LCS Client for the CS Domain (A/Gb mode) . 47
9.1.3 Core Network Position Procedure Initiation over the Gb interface . 47
9.1.3a Core Network Position Procedure Initiation over the Gb interface for Multilateration Positioning
methods . 48
9.1.4 Positioning Procedure Initiation from Core Network (Iu mode) . 49
9.1.5 Positioning Procedure Initiation from Internal LCS Client (Iu mode) . 49
9.2 Common Positioning Procedure for CS Domain in A/Gb mode . 49
9.2a Common Positioning Procedure for PS Domain in A/Gb mode . 50
9.2b Common Positioning Procedure for Iu mode . 51
9.2c GPRS Cell Change for the PS Domain in A/Gb mode . 52
9.2c.1 Intra-BSS Cell Change . 52
9.2c.2 Inter-BSS Cell Change . 52
9.3 TA Based Positioning in CS Domain for A/Gb-mode . 53
9.3.1 Definition of TA states . 53
9.3.1.1 MS in IDLE State . 53
9.3.1.2 MS in DEDICATED State . 53
9.3.2 TA Positioning Procedure . 54
9.3.3 Unsuccessful TA positioning procedure in BSC . 54
9.3a TA Based Positioning in PS Domain for A/Gb-mode . 54
9.3a.1 Definition of PS Domain TA Modes . 55
9.3a.1.1 MS in Packet Idle Mode . 55
9.3a.1.2 MS in Packet Transfer Mode . 55
9.3a.2 TA Positioning Procedure . 55
9.3a.2a TA Positioning Procedure for an MS in EC operation. 56
9.3a.3 Unsuccessful TA positioning procedure in BSS . 57
9.4 E-OTD and A-GNSS Positioning Procedures . 57
9.4.1 General procedures . 57
9.4.2 Positioning Request . 57
9.4.3 Assistance Data Delivery . 58
9.4.3a Positioning Capability Transfer . 59
9.4.4 Error Handling for E-OTD and A-GNSS in CS Domain . 60
9.4.5 Error Handling for the SMLC in CS Domain . 61
9.4.5a Error Handling for E-OTD and A-GNSS in PS Domain . 61
9.4.6 Broadcast of Assistance Data. 62
9.4.6.1 Point-To-Multipoint Assistance Data Broadcast Flow . 62
9.4.6.2 Ciphering . 63
9.4.6.2.1 Algorithm . 63
9.4.6.3 Deciphering key control and delivery to MS . 64
9.5 U-TDOA Positioning Procedures . 66
9.5.0 General . 66
9.5.1 U-TDOA Positioning in CS Domain for A/Gb-mode . 66
9.5.1.1 General Procedures . 66
9.5.1.2 CS U-TDOA Messages and Procedures on the Lb Interface .
...