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3GPP Glossaries

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Interfaces / Reference Points

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|   M1   |   M2   |   M3   |   Ma   |   Mb   |   MB2   |   Mc   |   Mg   |   Mi   |   Mj   |   Mk   |   Ml   |   Mm   |   MM10   |   Mn   |   Mp   |   Mr   |   Mr'   |   Mx   |   Mw   |   Mz   |

 


between  MBMS-GW  and  E-UTRAN / UTRAN

specified from  Rel-10
Source:   TS 23.002, clause 6a.11.5 

This reference point is used between MBMS-GW and E-UTRAN/UTRAN for MBMS data delivery using IP Multicast. The details for this reference point are described in TS 23.246, TS 29.281 and TS 36.445.

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between  MCE  and  eNodeB

specified from  Rel-10
Source:   TS 23.002, clause 6a.11.7 

This reference point is used to exchange signalling between MCE and eNodeB for MBMS Session Control. The details for this reference point are described in TS 23.246, TS 36.300 and TS 36.443.

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between  MME  and  MCE

specified from  Rel-10
Source:   TS 23.002, clause 6a.11.6 

This reference point is used to exchange signalling between MME and MCE for MBMS Session Control. The details for this reference point are described in TS 23.246, TS 36.300 and TS 36.444.

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between  I-CSCF  and  AS

specified from  Rel-6
Source:   TS 23.002, clause 6a.7.22 

This interface between Interrogating-CSCF and the Application Servers (i.e. SIP Application Server, OSA Service Capability Server, or CAMEL IM-SSF) is used to:
  • forward SIP requests destined to a Public Service Identity hosted by an Application Server directly to the Application Server. Details are described in TS 23.228, clause 5.4.12; and
  • initiate a request on behalf of a user or Public Service Identity, if the AS has no knowledge of the serving S-CSCF for that user or Public Service Identity. Details are described in TS 23.228, clause 5.6.5.3.

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between  IMS  and  IPv6 networks

specified from  Rel-5
Source:   TS 23.002, clause 6a.7.14 

Via the Mb reference point IPv6 network services are accessed. These IPv6 network services are used for user data transport. Note, that GPRS provides IPv6 network services to the UE, i.e. the GPRS Gi reference point and the IMS Mb reference point may be the same.

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between  GCS AS  and  BM-SC

specified from  Rel-12
in  TS 23.468  and  TS 29.468 

The MB2 reference point provides the ability for the application to:
  • Request the allocation/deallocation of a set of TMGIs,
  • Request to activate, deactivate, and modify an MBMS bearer.
The MB2 reference point provides the ability for the BM-SC to:
  • Notify the application of the status of an MBMS bearer.
Commands:
  • GAR/GAA:  GCS-Action-Request/Answer
  • GNR/GNA:  GCS-Notification-Request/Answer
See also  RFC 6733  for Diameter Base Protocol, and  TS 29.230  for 3GPP-specific Diameter codes and identifiers.

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between  (G)MSC Server  and  CS-MGW

specified from  Rel-4
Source:   TS 23.002, clause 6.4.1.7 

The Mc reference point describes the interfaces between the MSC Server and CS-MGW, and between the GMSC Server and CS-MGW. It has the following properties:
  • Full compliance with the H.248 standard, baseline work of which is currently carried out in ITU-T Study Group 16, in conjunction with IETF MEGACO WG.
  • Flexible connection handling which allows support of different call models and different media processing purposes not restricted to H.323 usage.
  • Open architecture where extensions/Packages definition work on the interface may be carried out.
  • Dynamic sharing of MGW physical node resources. A physical MGW can be partitioned into logically separate virtual MGWs/domains consisting of a set of statically allocated Terminations.
  • Dynamic sharing of transmission resources between the domains as the MGW controls bearers and manage resources according to the H.248 protocols.
The functionality across the Mc reference point will need to support mobile specific functions such as SRNS relocation/handover and anchoring. It is expected that current H.248/IETF Megaco standard mechanisms can be applied to enable this.

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between  MGCF  and  I-CSCF / S-CSCF

specified from  Rel-5
Source:   TS 23.002, clause 6a.7.4 

This reference point allows the MGCF to forward incoming session signalling (from the circuit switched network) to the CSCF for the purpose of interworking with circuit switched networks.

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between  S-CSCF  and  BGCF

specified from  Rel-5
Source:   TS 23.002, clause 6a.7.10 

This reference point allows the Serving CSCF to forward the session signalling to the Breakout Gateway Control Function for the purpose of interworking to the circuit switched networks.

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between  BGCF  and  MGCF

specified from  Rel-5
Source:   TS 23.002, clause 6a.7.11 

This reference point allows the Breakout Gateway Control Function to exchange session signalling message with the Media Gateway Control Function for the purpose of interworking to the circuit switched networks, or for transit scenarios.

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between  BGCF / IBCF  and  BGCF

specified from  Rel-5
Source:   TS 23.002, clause 6a.7.12 

This reference point allows the Breakout Gateway Control Function/IBCF to forward the session signalling to another Breakout Gateway Control Function.

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between  E-CSCF  and  LRF

specified from  Rel-7
Source:   TS 23.002, clause 6a.7.23a 

This reference point allows the E-CSCF to request the LRF to validate the location information received from the UE, to determine or query the LRF for routing information to emergency centres. Location information may be received from LRF and/or reference key to allow the PSAP to retrieve location at a later stage.

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between  CSCF / IBCF  and  Multimedia IP networks

specified from  Rel-5
Source:   TS 23.002, clause 7.4 

This is an IP interface between CSCF/IBCF and IP networks. This interface is used, for example, to receive a session request from another SIP server or terminal.

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between  MMS Relay/Server  and  MSCF

specified for  Rel-6
in  TS 23.140  and  TS 29.140 

The MM10 reference point is used to transfer multimedia message specific information between the MMS Relay/Server and an external MSCF, e.g. for number translation purposes.

Commands:
  • MPR/MPA:  Message-Process-Request/Answer
See also  RFC 6733  for Diameter Base Protocol, and  TS 29.230  for 3GPP-specific Diameter codes and identifiers.

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between  MGCF  and  IMS-MGW

specified from  Rel-5
Source:   TS 23.002, clause 6a.7.3 

This reference point describes the interfaces between the MGCF and IMS-MGW in the IMS. It has the following properties:
  • Full compliance with the H.248 standard functions for IMS - PSTN/PLMN interworking.
  • Flexible connection handling which allows support of different call models and different media processing purposes not restricted to H.323 usage.
  • Open architecture where extensions/Packages definition work on the interface may be carried out.
  • Dynamic sharing of IMS-MGW physical node resources. A physical IMS-MGW can be partitioned into logically separate virtual MGWs/domains consisting of a set of statically allocated Terminations.
  • Dynamic sharing of transmission resources between the domains as the IMS-MGW controls bearers and manage resources according to the H.248 protocols and functions for IMS.

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between  MRFC  and  MRFP

specified from  Rel-5
Source:   TS 23.002, clause 6a.7.6a 

This reference point allows an MRFC to control media stream resources provided by an MRF. It has the following properties:
  • Full compliance with the H.248 standard.
  • Open architecture where extensions (packages) definition work on the interface may be carried out.

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between  S-CSCF  and  MRFC

specified from  Rel-5
Source:   TS 23.002, clause 6a.7.6 

This reference point allows interaction between an S-CSCF and an MRFC.

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between  AS  and  MRFC

specified from  Rel-9
Source:   TS 23.002, clause 6a.7.5b 

This reference point allows interaction between an Application Server and an MRFC for session control without passing through an S-CSCF.

Further information on the Mr' reference point is provided in TS 23.218.

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between  CSCF / BGCF  and  IBCF

specified from  Rel-6
Source:   TS 23.002, clause 6a.7.20 

This reference point allows the communication and forwarding of signalling messages between a CSCF/BGCF and an IBCF, e.g. during session establishment.

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between  CSCF  and  CSCF

specified from  Rel-5
Source:   TS 23.002, clause 6a.7.7 

The Mw reference point allows the communication and forwarding of signalling messaging between CSCFs, e.g. during registration and session control.

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between  BM-SC  and  BM-SC

specified from  Rel-10
Source:   TS 23.002, clause 6a.10.2 

This reference point is the roaming variant of the Gmb reference point and is used to exchange signalling between a BM-SC in the VPLMN and a BM-SC in the HPLMN. The details for this reference point are described in TS 23.246 and TS 29.061.

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