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Content for  TS 29.202  Word version:  16.0.0

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1  ScopeWord‑p. 4

The present document defines the possible protocol architectures for transport of SS7 signalling protocols in Core Network.

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.
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2.1  Normative references

[1]
TR 21.905: "Vocabulary for 3GPP Specifications".
[2]
ITU-T Recommendation Q.701: "Functional description of the message transfer part (MTP) of signalling system No. 7".
[3]
ITU-T Recommendation Q.702: "Signalling data link".
[4]
ITU-T Recommendation Q.703: "Signalling link".
[5]
ITU-T Recommendation Q.704: "Signalling network functions and messages".
[6]
ITU-T Recommendation Q.705: "Signalling network structure".
[7]
ITU-T Recommendation Q.706: "Message transfer part signalling performance".
[8]
RFC 2960:  "Stream Control Transmission Protocol".
[9]
ITU-T Recommendation G.804: "ATM cell mapping into Plesiochronous Digital Hierarchy (PDH)".
[10]
ITU-T Recommendation I.112: "Vocabulary of terms for ISDNs".
[11]
ITU-T Recommendation I.361: "B-ISDN ATM layer specification".
[12]
ITU-T Recommendation I.363.5: "B-ISDN ATM Adaptation Layer specification: Type 5 AAL".
[13]
ITU-T Recommendation Q.2110: "B-ISDN ATM adaptation layer - Service specific connection oriented protocol (SSCOP)".
[14]
ITU-T Recommendation Q.2140: "B-ISDN ATM adaptation layer - Service specific coordination function for signalling at the network node interface (SSCF at NNI)".
[15]
ITU-T Recommendation Q.2210: "Message transfer part level 3 functions and messages using the services of ITU-T Recommendation Q.2140".
[17]
RFC 3309:  "SCTP Checksum Change".
[18]
RFC 4666:Signaling  System 7 (SS7) Message Transfer Part 3 (MTP3) - User Adaptation Layer (M3UA)".
[19]
RFC 4165:  Signaling System 7 (SS7) Message Transfer Part 2 (MTP2) -User Peer-to-Peer Adaptation Layer (M2PA)".
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2.2  Informative referencesWord‑p. 5

[16]
RFC 2719:  "Framework Architecture for Signalling Transport".

3  Definitions and abbreviations

3.1  Definitions

For the purposes of the present document, the terms and definitions given in TR 21.905 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905.
(no further terms defined)

3.2  Abbreviations

For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905.
AAL5
ATM Adaptation Layer type 5
ATM
Asynchronous Transfer Mode
IP
Internet Protocol
MTP
Message Transfer Part
MTP1
Message Transfer Part layer 1
MTP2
Message Transfer Part layer 2
MTP3
Message Transfer Part layer 3
M2PA
Message Transfer Part 2 -User Peer-to-Peer Adaptation Layer
M3UA
MTP3-User Adaptation
PDH
Plesiochronous Digital Hierarchy
SSCF
Service Specific Coordination Function
SSCOP
Service Specific Connection Oriented Protocol
SCCP
Signalling Connection Control Part
SCTP
Stream Control Transmission Protocol
SDH
Synchronous Digital Hierarchy
TCAP
Transaction Capabilities Application Part
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4  IntroductionWord‑p. 6

The Core Network enables the transport of SS7 signalling protocols between two entities by means of different underlying networks (e.g. MTP-based, IP-based or ATM-based).
The transport of SS7 signalling protocol messages of any protocol layer that is identified by the MTP level 3 layer, in SS7 terms, as a user part (MTP3-user) shall be accomplished in accordance with the protocol architecture defined in the following sub-clauses. The list of these protocol layers includes, but is not limited to, Signalling Connection Control Part (SCCP).
The transport of protocols which can be identified as SCCP-users, like for example TCAP, and in turn the transport of TCAP-users like MAP and CAP, shall also be accomplished in accordance with the defined protocol architectures, since their protocol messages are transferred as SCCP payload.
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