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|  L  |  La  |  Lb  |  Lc  |  Le  |  Lg  |  Lgd  |  Lh  |  Lid  |  Lp  |  Lpp  |  Lr  |  Ls  |  LTE Uu  |

 

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between  MSC
and  gsmSCF

specified from  GSM Rel-97  in
TS 09.02, clause 4.4.6 

When one of the following Supplementary Services, CD, ECT or MPTY, is invoked in the MSC a notification shall be sent towards the gsmSCF.


La

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between  GMLC
and  3GPP AAA Server

see it   here

specified from  Rel-7  in
TS 23.271, clause 6 

This interface was added to support LCS for I-WLAN.


Lb   (BSSAP-LE)

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between  BSC
and  SMLC

specified from  GSM Rel-98  in
TS 03.71, clause 5.6
TS 43.059, clause 5 

Within the GERAN, the BSC receives authenticated requests for LCS information from the core network across the A, Gb or Iu interface and passes these to the SMLC via the Lb interface. Signalling on this interface uses BSSAP-LE, which is specified in TS 49.031.

In UTRAN, the Lb interface is not standardized, the SMLC functionality is included in SRNC.


Lc   (MAP)

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between  GMLC
and  gsmSCF

see it   here

specified from  GSM Rel-98  in
TS 03.71, clause 5.6
TS 23.271, clause 7.3 

This interface is used to get location information for CAMEL based services.


Le   (OMA MLP / OSA API)

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between  GMLC
and  External LCS Client

see it   here

specified from  GSM Rel-98  in
TS 03.71, clause 5.6
TS 23.271, clause 5.1 

The Le interface is used by the external LCS client to retrieve location information from the LCS server. Signalling on this interface may use the OMA Mobile Location Protocol (MLP) and Open Service Access Application Programming Interface (OSA-API).


Lg   (MAP)

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between  GMLC
and  MSC / MSC-S / SGSN /

see it   here

specified from  GSM Rel-98  in
TS 03.71, clause 5.6
TS 23.271, clause 7.3 

This interface is used by the GMLC to convey a location request to the MSC or SGSN currently serving a particular target UE whose location was requested. The interface is used by the MSC or SGSN to return location results to the GMLC.


Lgd   (Diameter)

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between  GMLC
and  SGSN

see it   here

specified from  Rel-12  in
TS 23.271, clause 7.11
TS 29.172 

Lgd is the interface that is used by the GMLC to convey a location request to the SGSN currently serving a particular target UE whose location was requested. The interface is also used by the SGSN to return location results to the GMLC. This interface is applicable only for an SGSN supporting EPS based interfaces and protocols.

Commands:
  • PLR/PLA:  Provide-Location-Request/Answer
  • LRR/LRA:  Location-Report-Request/Answer
See also  RFC 6733  for Diameter Base Protocol, and  TS 29.230  for 3GPP-specific Diameter codes and identifiers.


Lh   (MAP)

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between  GMLC
and  HLR

see it   here

specified from  GSM Rel-98  in
TS 03.71, clause 5.6
TS 23.271, clause 7.3 

This interface is used by the GMLC to request the address of the H-GMLC, and/or the address of the visited MSC or SGSN for a particular target UE whose location has been requested.


Lid

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between  H_GMLC
and  PMD

specified from  Rel-6  in
TS 23.271, clause 7.5 

If the UE subscribers pseudonym can be mapped or decrypted to the corresponding verinym in the standalone PMD, this interface is used by the H-GMLC to request the PMD to perform an identity check.


Lp   (BSSAP-LE / SMLCPP)

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between  SMLC
and  SMLC

specified from  GSM Rel-98  in
TS 03.71, clause 5.6 

In GERAN, a SMLC may support the Lp interface to enable access to information and resources owned by another SMLC. Signalling on this interface uses BSSAP-LE, which is defined in TS 49.031, and SMLCPP, which is specified in TS 48.031.

In UTRAN, the SMLC functionality is included in SRNC and the Iur interface shall include the Lp interface type of functionality.


Lpp

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between  GMLC
and  PPR

specified from  Rel-6  in
TS 23.271, clause 7.4 

If the UE subscribers LCS privacy information is kept in the PPR this interface is used by the H-GMLC to request the PPR to perform a privacy check.


Lr   (OMA RLP)

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between  GMLC
and  GMLC

specified from  Rel-6  in
TS 23.271, clause 5.6 

The Lr interface is used by the GMLC to communicate with other GMLCs. Signalling on this interface may use the OMA Roaming Location Protocol (RLP).


Ls   (BSSAP-LE)

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between  SMLC
and  MSC-S

specified from  GSM Rel-98  in
TS 03.71, clause 5.6
TS 09.31 



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between  UE
and  E-UTRAN

 

See E-UTRAN Uu.



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