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Content for  TS 29.415  Word version:  16.0.0

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0  IntroductionWord‑p. 5

The present document specifies the user plane protocol used between two Media Gateways in the CS core network. Through out the present document this protocol shall be referred to as the Nb UP protocol. The Nb UP protocol is for a large part identical to the Iu UP protocol (see TS 25.415), and only the differences between the two protocols are specified. This specification defines the applicability of the UP, as defined in TS 25.415, for the Nb interface only.
Given that the Nb UP uses the same PDU types as the Iu UP, the term IuFP is used to refer to the common framing.
For the purpose of the present document, any occurrence of the term "Iu UP" in the corresponding sections of TS 25.415, shall be interpreted as "Nb UP".
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1  ScopeWord‑p. 6

The present document specifies the user plane protocol of the bearer used between two MGWs within the BICC-based CS core network, called the Nb UP protocol. The present document assumes the implementation of the split between call control and the bearer transport and control, as specified in TS 23.205, see Figure 1. Note that the present document does not preclude an implementation of a combined MSC Server and MGW.
Reproduction of 3GPP TS 29.415, Figure 1: CS core network logical architecture
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2  References

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]
TS 23.205: "Bearer Independent CS Core Network; Stage 2"
[2]
TS 25.415: "UTRAN Iu Interface User Plane Protocols"
[3]
TS 29.232: "Media Gateway Controller; Media Gateway interface; Stage 3"
[4]
TS 29.414: "Core Network Nb Data Transport and Transport Signalling"
[5]
TR 41.001: "GSM Release specifications"
→ to date, withdrawn by 3GPP
[6]
TR 21.905: "Vocabulary for 3GPP Specifications"
[7]
RFC 1889:  "RTP A Transport Protocol for Real Time Applications"
[8]
ITU-T I.366.1 (06/98): "Segmentation and Reassembly Service Specific Convergence Sublayer for the AAL type 2"
[9]
TS 26.445: "Codec for Enhanced Voice Services (EVS); Detailed Algorithmic Description".
[10]
TS 26.453: "Codec for Enhanced Voice Services (EVS); Speech codec frame structure".
[11]
TS 26.454: "Codec for Enhanced Voice Services (EVS); Interface to Iu, Uu, Nb and Mb".
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3  Definitions, symbols and abbreviationsWord‑p. 7

3.1  Definitions

Definitions used in the present document are listed in TR 21.905.

3.2  Symbols

For the purposes of the present document, the following symbols apply:
Iu
Interface between the RNS and the core network. It is also considered as a reference point.
Nb
Interface between media gateways.
IuFP
Iu Framing protocol

3.3  Abbreviations

For the purposes of the present document, the following abbreviations apply:
AAL
ATM Adaptation Layer
AAL2
AAL Type 2
ATM
Asynchronous Transfer Mode
CMR
Codec Mode Request
CN
Core Network
CNL
Core Network Layer
CS
Circuit Switched
EVS
Enhanced Voice Services
EVS-CMR
Codec Mode Request for EVS
FFS
For Further Study
IPTI
Inter PDU Transmission Interval
Iu UP
Iu interface User Plane
MGW
Media GateWay
PDU
Protocol Data Unit
RTP
Real-time Transmission Protocol
SAP
Service Access Point
SDU
Service Data Unit
SRNC
Serving Radio Network Controller

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