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Content for  TS 29.016  Word version:  16.0.0

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6  Conformance to SCCPWord‑p. 16

6.1  Overview

The purpose of this clause is to identify the subset of the SCCP functions which are necessary to provide addressing, error detection and segmentation facilities in the Gs interface. If this subset of SCCP functions is implemented, compatibility with a full ITU-T or ANSI SCCP shall be maintained. Only the needs of the user of SCCP (refer to TS 29.018) are taken into account in this clause: the operations and maintenance requirements about SCCP functions are outside the scope of the present document.
No SCCP translation function is required in the VLR or the SGSN between the national and the local MTP. The Destination Point Code and Subsystem Number would allow direct routing by the local SCCP and MTP. Global Title addressing is supported on the Gs interface to provide flexibility in the addressing scheme implementation (note that the SGSN is assigned a global title in order to communicate with an HLR across an inter PLMN boundary).
Only connectionless class 0 SCCP services are used on the Gs interface. These simplifications are applicable to the signalling between an SGSN and a VLR in GSM PLMNs.
The minimum set of SCCP functions which apply are specified in the ITU-T Recommendations Q.711, Q.712, Q.713 and Q.714, for E1 interface and ANSI T1.112 for T1 interface with the qualifications specified in this Recommendation.
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6.2  SCCP Primitives

6.2.1  SCCP Primitives for E1 Interface (ITU Recommendation Q.711)

  • ITU-T Recommendation Q.711, clause 1:
    • No SCCP connection-oriented services are used.
  • ITU-T Recommendation Q.711, clause 2:
    • No SCCP connection-oriented services are used. Only connectionless class 0 is used.
  • ITU-T Recommendation Q.711, subclause 2.1:
    • Not applicable.
  • ITU-T Recommendation Q.711, subclause 4.1:
    • Connection-oriented functions are not applicable
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6.2.2  SCCP Primitives for T1 Interface (ANSI Standards T1.112.1)

  • ANSI T1.112.1, clause 1:
    • No SCCP connection-oriented services are used.
  • ANSI T1.112.1, clause 2:
    • No SCCP connection-oriented services are used. Only connectionless class 0.
  • ANSI T1.112.1, subclause 2.1:
    • Not applicable.
  • ANSI T1.112.1, subclause 4.1:
    • Connection-oriented functions are not applicable.
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6.3  SCCP messagesWord‑p. 17

6.3.1  SCCP messages for E1 Interface (ITU Recommendation Q.712)

  • ITU-T Recommendation Q.712, subclauses 1.1 to 1.14:
    • Messages not used.
  • ITU-T Recommendation Q.712, subclause 1.16:
    • The Subsystem-Out-Of-Service-Grant (SOG) message is not used.
  • ITU-T Recommendation Q.712, subclause 1.17:
    • The Subsystem-Out-Of-Service-Request (SOR) message is not used.
  • ITU-T Recommendation Q.712, subclauses 2.4, 2.6, 2.7, 2.9, 2.11, 2.12, 2.13, 2.14, 2.16 and 2.17:
    • Parameters not used.

6.3.2  SCCP messages for T1 Interface (ANSI Standards T1.112.2)

  • ANSI T1.112.2, subclauses 2.1 to 2.14:
    • Messages not used.
  • ANSI T1.112.2, subclause 3.4:
    • The Subsystem-Out-Of-Service-Request (SOR) message is not used.
  • ANSI T1.112.2, subclause 3.5:
    • The Subsystem-Out-Of-Service-Grant (SOG) message is not used.
  • ANSI T1.112.2, subclause 3.6:
    • The Subsystem-Backup Routing (SBR) (Optional) message is not used.
  • ANSI T1.112.2, subclause 3.7:
    • The Subsystem-Normal Routing (SNR) (Optional) message is not used.
  • ANSI T1.112.2, subclause 3.8:
    • The Subsystem-Routing Status Test (SRT) (Optional) message is not used.
  • ANSI T1.112.2, subclauses 4.2, 4.4, 4.6, 4.7, 4.10, 4.11, 4.12, 4.13, 4.15, 4.16, 4.17, 4.18 and 4.19:
    • Parameters not used.
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6.4  SCCP formats and codesWord‑p. 18

6.4.1  SCCP format and codes for E1 Interface (ITU Recommendation Q.713)

  • ITU-T Recommendation Q.713, subclause 3.4:
    • The called party address shall include the appropriate sub system number. All other aspects of SCCP addressing are network specific.
  • ITU-T Recommendation Q.713, subclause 3.4.2.2:
    • SSN value:
      • This is a national network concern. Different SSN values can be allocated for SGSN and VLR.
  • ITU-T Recommendation Q.713, subclause 3.5:
    • The calling party address shall include the appropriate sub system number. All other aspects of SCCP addressing are network specific.
  • ITU-T Recommendation Q.713, subclause 3.6:
    • Protocol class: the classes 1, 2 and 3 are not used.
  • ITU-T Recommendation Q.713, subclauses 3.7 3.8, 3.9, 3.10, 3.11, 3.13, 3.14 and 3.15:
    • Parameters not used.
  • ITU-T Recommendation Q.713, subclauses 4.2 to 4.9 and 4.12 to 4.17:
    • Messages not used.
  • ITU-T Recommendation Q.713, subclause 5.1.1:
    • SOR and SOG not needed.
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6.4.2  SCCP format and codes for T1 Interface (ANSI Standards T1.112.3)

  • ANSI T1.112.3, subclause 3.4:
    • The called party address shall include the appropriate sub system number. All other aspects of SCCP addressing are network specific.
  • ANSI T1.112.3, subclause 3.4.2.1:
    • The SSN values are a national network concern. Different SSN values can be allocated for SGSN and VLR.
  • ANSI T1.112.3, subclause 3.5:
    • The calling party address shall include the appropriate sub-system number. All other aspects of SCCP addressing are network specific.
  • ANSI T1.112.3, subclause 3.6:
    • Protocol class: the classes 2 and 3 are not used.
  • ANSI T1.112.3, subclauses 3.7, 3.8, 3.9, 3.10, 3.11, 3.13, 3.14 and 3.15:
    • Parameters not used.
  • ANSI T1.112.3, subclauses 4.2 to 4.9 and 4.12 to 4.17:
    • Messages not used.
  • ANSI T1.112.3, subclause 5.1.1:
    • SOR, SNR, SRT, SBR, and SOG not needed.
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6.5  SCCP proceduresWord‑p. 19

6.5.1  SCCP procedures for E1 Interface (ITU Recommendation Q.714)

  • ITU-T Recommendation Q.714, subclauses 1.1.2 and 1.1.3:
    • Protocol classes 2 and 3 not used.
    • Connection-oriented services are not used.
  • ITU-T Recommendation Q.714, subclause 1.2:
    • Connection-oriented services are not used.
  • ITU-T Recommendation Q.714, subclause 1.3:
    • Protocol class 1 not used.
  • ITU-T Recommendation Q.714, subclause 2.1:
    • The two basic categories of addresses for conectionless messages are used.
  • ITU-T Recommendation Q.714, subclause 2.2 and 2.3:
    • No connection-oriented message is used.
  • ITU-T Recommendation Q.714, clause 3:
    • Connection-oriented procedures are not used.
  • ITU-T Recommendation Q.714, clause 5:
    • Only those messages and procedures relating to non-replicated subystems or nodes are required.
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6.5.2  SCCP procedures for T1 Interface (ANSI Standards T1.112.4)

  • ANSI T1.112.4, subclauses 1.1.2 and 1.1.3:
    • Protocol classes 2 and 3 not used.
    • Connection-oriented services are not used.
  • ANSI T1.112.4, subclause 1.2:
    • Connection-oriented services are not used.
  • ANSI T1.112.4, subclause 1.3:
    • Protocol class 1 is not used.
  • ANSI T1.112.4, subclause 2.1:
    • The two basic categories of addresses for connectionless messages are used.
  • ANSI T1.112.4, subclause 2.2 and 2.3:
    • No connection-oriented message is used.
  • ANSI T1.112.4, clause 3:
    • Connection-oriented procedures not used.
  • ANSI T1.112.4, clause 5:
    • Only those messages and procedures relating to non-replicated subsystems or nodes are required.
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