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3GPP Glossaries

 

 

Interfaces / Reference Points

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 Nb     #  Nc     #  Np     #  Nq     #  Nq'     #  Ns     #  Nt    

 


between  CS-MGW  and  CS-MGW

[R4]+

Over the Nb reference point the bearer control and transport are performed. The transport may be RTP/UDP/IP or AAL2 for transport of user data. Different options for user data transport and bearer control shall be possible on Nb, for example: AAL2/Q.AAL2, STM/none, RTP/H.245, IPBC.

Source:   TS 23.002, clause 6.4.1.9

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between  (G)MSC Server  and  MSC Server

[R4]+

Over the Nc reference point, the Network-Network based call control is performed. Examples of this are ISUP or an evolvement of ISUP for bearer independent call control (BICC). Different options for signalling transport on Nc shall be possible including IP.

Source:   TS 23.002, clause 6.4.1.8

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Np (Diameter)


between  RCAF  and  PCRF / V-PCRF

specified from  Rel-13
in  TS 23.203  and  TS 29.217

The Np reference point enables transport of RAN User Plane Congestion Information (RUCI) sent from the RCAF to the PCRF for all or selected subscribers, depending on the operator's congestion mitigation policy. The Np reference point supports the following functions:
  • Reporting of RUCI from the RCAF to the PCRF.
  • Sending, updating and removal of the reporting restrictions from the PCRF to the RCAF.
Commands:
  • NRR/NRA:  Non-Aggregated-RUCI-Report-Request/Answer
  • ARR/ARA:  Aggregated-RUCI-Report-Request/Answer
  • MUR/MUA:  Modify-Uecontext-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  MME  and  RCAF

specified from  Rel-13
in  TS 23.401 – Clause 5.1.1.13  and  TS 29.405

The Nq reference point enables the RCAF to retrieve the list of UEs (identified by the IMSIs) served by an eNB or E-UTRAN cell and the list of APNs of the active PDN connections of each IMSI.

 

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between  SGSN  and  RCAF

specified from  Rel-13
in  TS 23.060 – Clause 5.6.3.12  and  TS 29.405

The Nq' reference point enables the RCAF to retrieve the list of APNs of the active PDN connections of a given UE (identified by the IMSI).

 

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Ns (Diameter)


between  RCAF  and  SCEF

specified from  Rel-13
in  TS 23.682  and  TS 29.153

The Nt reference point is used to report the network status from the RCAF to the SCEF.

Commands:
  • NSR/NSA:  Network-Status-Request/Answer
  • NCR/NCA:  Network-Status-Continuous-Report-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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Nt (Diameter)


between  PCRF  and  SCEF

specified from  Rel-13
in  TS 23.203  and  TS 29.154

The Nt reference point is used to report the transfer policies from the PCRF to the SCEF.

Commands:
  • BTR/BTA:  Background-Data-Transfer-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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