TS 29.171 — LCS Application Protocol (LCS-AP) between the MME and E-SMLC (SLs)⚓︎
Release: Rel 14 · Version assessed: 14.2.0 · Network: 4G · Applies to: MME · Interfaces: SLs
Optional capability, configured on request
The network function software implements this specification, and the statement below records that implementation. An Expeto deployment does not configure this capability by default and the acceptance test catalog does not cover it. If your deployment needs any part of it, contact Expeto Product Support: enabling it is configuration work that Expeto scopes and carries out with you.
Mandatory items: 40, of which 40 supported. A further 35 clauses of the specification carry no conformance requirement and are not listed.
Mandatory items⚓︎
| Ref. | Item | Status | Support | Remarks |
|---|---|---|---|---|
| 4.1 | General | Mandatory | Supported | |
| 5.0 | LCS-AP Message Transport | Mandatory | Supported | |
| 5.1 | General | Mandatory | Supported | |
| 5.2 | Protocol Layering | Mandatory | Supported | |
| 5.3 | Usage of SCTP Associations | Mandatory | Supported | SCTP multi-homing is not supported on the SLs interface. |
| 6.0 | LCS-AP Procedures | Mandatory | Supported | |
| 6.1 | General | Mandatory | Supported | |
| 6.2 | Procedures Applicable to LCS-AP | Mandatory | Supported | |
| 6.2.1 | Location Service Request | Mandatory | Supported | |
| 6.2.1.1 | General | Mandatory | Supported | |
| 6.2.1.2 | Successful Operation | Mandatory | Supported | |
| 6.2.1.3 | Unsuccessful Operation | Mandatory | Supported | |
| 6.2.2 | Location Information Exchange | Mandatory | Supported | |
| 6.2.2.1 | Connection Oriented Information Transfer | Mandatory | Supported | |
| 6.2.2.1.1 | General | Mandatory | Supported | |
| 6.2.2.1.2 | Successful Operation | Mandatory | Supported | |
| 6.2.2.1.3 | Abnormal Conditions | Mandatory | Supported | |
| 6.3.1 | Location Abort | Mandatory | Supported | |
| 6.3.1.1 | General | Mandatory | Supported | |
| 6.3.1.2 | Normal Operation | Mandatory | Supported | |
| 6.3.1.3 | Abnormal Conditions | Mandatory | Supported | |
| 7.0 | LCS-AP Messages and Message Formats | Mandatory | Supported | |
| 7.1 | General | Mandatory | Supported | |
| 7.2 | Message Formats | Mandatory | Supported | |
| 7.3 | LCS-AP Messages | Mandatory | Supported | |
| 7.3.1 | LCS-AP Location Request message | Mandatory | Supported | |
| 7.3.2 | LCS-AP Location Response message | Mandatory | Supported | |
| 7.3.3 | LCS-AP Location Abort Request message | Mandatory | Supported | |
| 7.3.4 | LCS-AP Connection Oriented Information message | Mandatory | Supported | |
| 7.4.2 | Message Type | Mandatory | Supported | |
| 7.4.3 | Location Type | Mandatory | Supported | |
| 7.4.16 | LCS Cause | Mandatory | Supported | |
| 7.4.19 | Network Element | Mandatory | Supported | |
| 7.4.22 | Altitude and direction | Mandatory | Supported | |
| 7.4.23 | Geographical Coordinates | Mandatory | Supported | |
| 7.4.24 | Uncertainty Ellipse | Mandatory | Supported | |
| 7.4.25 | Horizontal Speed and Bearing | Mandatory | Supported | |
| 7.4.26 | Vertical Velocity | Mandatory | Supported | |
| 7.4.28 | Correlation ID | Mandatory | Supported | |
| 8.2 | Timers of LCS-AP | Mandatory | Supported | Only timer T3x01 is supported currently & it is not user configurable. |
Optional items⚓︎
The specification leaves these 27 items to the implementation; 24 are supported or partially supported. An item marked Not applicable belongs to an area the platform does not provide, named in the Support column. Expand for the full list.
27 optional items
| Ref. | Item | Support | Remarks |
|---|---|---|---|
| 6.2.2.2 | Connectionless Information Transfer | Supported | |
| 6.2.2.2.1 | General | Supported | |
| 6.2.2.2.2 | Successful Operation | Supported | |
| 6.2.2.2.3 | Unsuccessful Operation | Supported | |
| 6.2.2.2.4 | Abnormal Conditions | Supported | |
| 6.3.2 | Reset | Not supported | |
| 7.3.5 | LCS-AP Connectionless Information message | Supported | |
| 7.3.6 | LCS-AP Reset Request message | Not supported | |
| 7.3.7 | LCS-AP Reset Acknowledge message | Not supported | |
| 7.4.4 | E-CGI | Supported | |
| 7.4.5 | LCS Client Type | Supported | |
| 7.4.6 | LCS Priority | Supported | |
| 7.4.7 | LCS QoS | Supported | |
| 7.4.8 | UE Positioning Capability | Supported | |
| 7.4.9 | Include Velocity | Supported | |
| 7.4.10 | IMSI | Supported | |
| 7.4.11 | IMEI | Supported | |
| 7.4.12 | Geographic Area | Supported | |
| 7.4.13 | Positioning Data | Supported | |
| 7.4.14 | Velocity Estimate | Supported | |
| 7.4.15 | Accuracy Fulfilment Indicator | Supported | |
| 7.4.17 | Payload Type | Supported | |
| 7.4.18 | APDU | Supported | |
| 7.4.20 | Return Error Request | Supported | |
| 7.4.21 | Return Error Cause | Supported | |
| 7.4.27 | PLMN Identity | Supported | |
| 7.4.29 | eNB ID | Supported |
Assessed 2026-09-15 against TS 29.171 version 14.2.0.