Content for TS 24.171 Word version: 18.0.0
1 Scope
2 References
3 Definitions, symbols and abbreviations
3.1 Definitions
3.2 Abbreviations
4 General
4.1 Overview
4.2 LCS Support capabilities
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1 Scope p. 5
The present document specifies the operations and information coding for the Non-access Stratum (NAS) layer protocol for supporting the Location Services (LCS) in the Evolved Universal Terrestrial Radio Access Network (E-UTRAN).
The present document is applicable to the User Equipment (UE) and to the Mobility Management Entity (MME) in the Evolved Packet System (EPS).
The present document is developed in accordance to the general principles stated in TS 23.271.
2 References p. 5
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]
TR 21.905: "Vocabulary for 3GPP Specifications".
[2]
TS 23.271: "Functional stage 2 description of LCS".
[3]
TS 24.301: "Non-Access-Stratum (NAS) protocol for Evolved Packet System (EPS)".
[4]
TS 36.355: "LTE Positioning Protocol".
[5]
TS 24.080: "Mobile radio interface layer 3 supplementary services specification; Formats and coding ".
[6]
TS 24.030: "LCS Supplementary service operations; Stage 3".
[7]
TS 29.171: "Definition of SLs interface for Control Plane LCS".
[8]
TS 23.272: "Circuit Switched (CS) fallback in Evolved Packet System (EPS); Stage 2".
3 Definitions, symbols and abbreviations p. 5
3.1 Definitions p. 5
For the purposes of the present document, the terms and definitions given in TR 21.905 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905.
For the purposes of the present document, the following terms and definitions given in TS 23.272 apply:
CS fallback
3.2 Abbreviations p. 6
For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905.
EPS
Evolved Packet System
IE
Information Element
E-UTRAN
Evolved Universal Terrestrial Radio Access Network
LCS
Location Services
LPP
LTE Positioning Protocol
LTE
Long Term Evolution
MME
Mobility Management Entity
MO-LR
Mobile Originated Location Request
MT-LR
Mobile Terminated Location Request
NAS
Non-access Stratum
UE
User Equipment
4 General p. 6
4.1 Overview p. 6
4.1.1 NAS aspect p. 6
To enable transfer of application protocol messages between the MME and the UE, a generic "container" message is defined on the downlink (Downlink Generic NAS Transport message) and the uplink (Uplink Generic NAS Transport message). The message protocol and procedures are described in TS 24.301.
4.1.2 LCS aspect p. 6
Location Services (LCS) uses the generic containers provided by the NAS Generic Transport mechanism to transfer LCS signalling messages between the UE and the network.
Currently, container in the generic transport messages can carry the following LCS information:
4.2 LCS Support capabilities p. 6
4.2.1 UE support of LCS p. 6
The UE announces to the network its ability to support LCS notification mechanism and/or LPP messages using the UE Network Capability IE defined in TS 24.301.
4.2.2 MME support of LCS p. 7
The network announces to the UE its ability to support LCS MO-LR mechanism in E-UTRAN and GERAN/UTRAN using the EPS network feature support IE defined in TS 24.301. These information are taken into account by the UE, in addition to UE's LCS and CSFB capabilities for UE to determine whether to initiate EPC-MO-LR procedure or CS fallback procedure for CS-MO-LR in GERAN/UTRAN as specified in TS 23.272, subclause 8.3.1.
