ATIS 1000674-2002 BICC CS1+ Signaling Transport Converters (STCs).pdf

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1、 AMERICAN NATIONAL STANDARD FOR TELECOMMUNICATIONS ATIS-1000674.2002(R2012) BICC CS1+ : Signaling Transport Converters (STCs) ATIS is the leading technical planning and standards development organization committed to the rapid development of global, market-driven standards for the information, enter

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5、e American National Standards Institute (ANSI). For more information, please visit .AMERICAN NATIONAL STANDARD Approval of an American National Standard requires review by ANSI that the requirements for due process, consensus, and other criteria for approval have been met by the standards developer.

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10、sed or withdrawn at any time. The procedures of the American National Standards Institute require that action be taken periodically to reaffirm, revise, or withdraw this standard. Purchasers of American National Standards may receive current information on all standards by calling or writing the Ame

11、rican National Standards Institute. Notice of Disclaimer all users of this standard are therefore encouraged to investigate the possibility of applying the most recent edition of the Standards and other references listed below. ITU-T Recommendation X.200 (1994), Information Technology Open Systems I

12、nterconnection - Basic reference model: The basic model.1ITU-T Recommendation X.210 (1993), Information Technology Open Systems Interconnection - Basic reference model: Conventions for the definition of OSI services.13 Definitions This standard is based upon the concepts developed in ITU-T Recommend

13、ations X.200 and X.210 and on ITU-T Recommendation Q.2150.0 . In addition, for the purpose of this standard, the following definitions apply: 1This document is available from the International Telecommunications Union. 0-1 T1.674.0-2002 3.1 Generic Signaling Transport Service: The function that enab

14、les a signaling entity to communicate with a peer signaling entity independently of the underlying signaling transport. 3.2 Signaling Transport: A signaling link or network that connects two signaling entities. 3.3 Signaling Transport Converter: A function that converts the services provided by a pa

15、rticular Signaling Transport to the services required by the Generic Signaling Transport Service. 4 Abbreviations it represents the STC SDU. 0-5 T1.674.0-2002 6.3 Establishment On the establishment of a signaling transport and the associated signaling transport converter entity (for example, at powe

16、r up), the initial conditions are the same as if an OUT-OF-SERVICE.indication had been conveyed across this SAP. Also, at this time the START-INFO.indication is sent to the signaling entity. 6.4 State transition diagram for sequences of primitives of the Generic Signaling Transport Service This subc

17、lause defines the constraints on the sequences in which the primitives may occur at the layer boundaries of the Generic Signaling Transport service. The sequences are related to the states at one Generic Signaling Transport endpoint between the Generic Signaling Transport service provider and its us

18、er. The possible overall sequences of primitives are shown in the state transition diagram, Figure 3/T1.674.0. 0-6 T1.674.0-2002 Figure 3/T1.674.0 - State transition diagram for sequences of primitives 0-7 T1.674.0-2002 Annex A/T1.674.0 (informative) A Bibliography The following documents contain in

19、formation that may be useful to understanding the usage of this Recommendation. There are no additional provisions of this Standard derived from these documents. T1.TR.69-2000, Signaling Requirements for the Support of Narrowband Services Via Broadband Transport Technologies.2T1.TR.71-2001, Signalin

20、g Requirements for the Support of Narrowband Services via Broadband Transport Technologies, CS1+.2T1.674.1-2002, Signaling Transport Converter on MTP3.2T1.674.2-2002, Signaling Transport Converter on SSCOP and SSCOPMCE.2T1.111-2001, Signaling System Number 7 (SS7) Message Transfer Part.2T1.637-1999,

21、 B-ISDN ATM Adaptation Layer Service Specific Connection Oriented Protocol (SSCOP).2ITU-T Recommendation Q.2111, Service Specific Connection Oriented Protocol in a Multi-link and Connectionless Environment (SSCOPMCE).1ITU-T Recommendation Q.2150.0, Generic Signaling Transport Service.12This document

22、 is available from the Alliance for Telecommunications Industry Solutions, 1200 G Street N.W., Suite 500, Washington, DC 20005. 0-8 AMERICAN NATIONAL STANDARD T1.674.1-2002(R2007) American National Standard for Telecommunications Signaling Transport Converter on MTP3 1 Scope This standard specifies

23、the signaling transport converter sublayer on top of the Message Transfer Part (MTP) specified in T1.111.4-2001, MTP3. T1.111.4-2001 specifies the peer-to-peer protocol for the transfer of information and control between any pair of MTP level 3 entities. This standard allows for both MTP2 and SAAL a

24、s the underlying link layer below MTP3. This standard covers the specification of the sublayer structure, the PDU structures of the signaling transport converter sublayer, and the mechanisms for the provision of the Generic Signaling Transport Service. When this Signaling Transport Converter on MTP

25、is applied for a signaling protocol entity, that entity is liberated from considering peculiarities of the underlying signaling transport service. This is achieved by relying on a Generic Signaling Transport Service that is provided, for example, by the sublayer specified in this standard. This stan

26、dard describes the interactions between the Signaling Transport Converter (STC) and the next higher layer, i.e., the BICC signaling protocol entity, between the STC and the Message Transfer Part, and between the STC and layer management. 2 Normative References The following standards and other refer

27、ences contain provisions which, through reference in this text, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All Standards and other references are subject to revisions; all users of this standard are therefore encouraged to investigate the p

28、ossibility of applying the most recent edition of the Standards and other references listed below. ITU-T Recommendation X.200, Information Technology Open Systems Interconnection Basic reference model: The basic model.1ITU-T Recommendation X.210, Information Technology Open Systems Interconnection B

29、asic reference model: Conventions for the definition of OSI services.1T1.674.0-2002, Generic Signalling Transport Service.2T1.111-2001, Signalling System No.7 (SS7) Message Transfer Part (MTP).21 This document is available from the International Telecommunications Union. 2 This document is available

30、 from the Alliance for Telecommunications Industry Solutions, 1200 G Street N.W., Suite 500, Washington, DC 20005. 1-1 T1.674.1-2002 T1.113.4-2000, Signalling System No.7 (SS7) - ISDN User Part Signalling Procedures.23 Definitions This standard is based upon the concepts developed in ITU-T Recommend

31、ations X.200 and X.210.and Q.2150.1, and terminology used in this document is intended to be consistent with the definitions in the ITU-T Recommendations. 4 Abbreviations it is indicated at creation of the STC entity. d) CIC control indication to the STC user: This function indicates to the STC user

32、, at creation of the STC entity, whether it serves as the controlling node for either the odd or even CIC values of the call association. 6 Elements for layer-to-layer communication 6.1 The Generic Signaling Transport Service The Generic Signaling Transport Service is specified in T1.674.0. For conv

33、enience, a summary of the primitives for accessing the service is reproduced in Table 1/T1.674.1. In the event of any difference between this table and the definitions in T1.674.0, the definitions in T1.674.0 take precedence. 1-4 T1.674.1-2002 Table 1/T1.674.1 - Primitives and parameters of the Gene

34、ric Signaling Transport Sublayer Primitive Type Generic Name Request Indication Response Confirm START-INFO - Max_Length CIC_Control - - IN-SERVICE - Level - - OUT-OF-SERVICE - (Note 1) - - CONGESTION - Level - - TRANSFER Sequence Control STC User Data Priority STC User Data Priority - - - : This pr

35、imitive is not defined NOTE 1 This primitive has no parameters On the establishment of a STC entity and the associated STC user entity (for example, at power up), the initial condition is the same as if an OUT-OF-SERVICE.indication primitive had been conveyed across this SAP. Also, at this time the

36、START-INFO.indication is sent to the signaling entity. 6.2 The Service provided by MTP This subclause specifies the information flow across the Signaling Transport Converter - Message Transfer Part Level 3 (MTP3) boundary. This boundary is defined in T1.111.1 and is summarized below. In the event of

37、 any difference between the following summary and the definitions in T1.111.1, the definitions in T1.111.1 take precedence. The primitives and parameters between the STC and MTP3 are shown in Table 2/T1.674.1. NOTE - This service corresponds to the “Specific Signaling Transport Service” in Figure 1/

38、T1.674.0 in T1.674.0. 1-5 T1.674.1-2002 Table 2/T1.674.1 - Message Transfer Part service primitives Primitive Type Generic Name Request Indication Response Confirm MTP-TRANSFER OPC (see 2.2/T1.111.4) DPC (see 2.2/T1.111.4) SLS (see 2.2/T1.111.4) (Note 1)SIO (see 14.2/T1.111.4) User Data (see 2.3.8/T

39、1.111.3) OPC (see 2.2/T1.111.4) DPC (see 2.2/T1.111.4) SLS (see 2.2/T1.111.4) (Note 1)SIO (see 14.2/T1.111.4) User Data (see 2.3.8/T1.111.3) - - MTP-PAUSE (Stop) - Affected DPCa)- - MTP-RESUME (Start) - Affected DPCa)- - MTP-STATUS - Affected DPC Cause (Note 2) - - - : This primitive is not defined

40、a) See 7.2.6 of T1.111.1. NOTES 1 The MTP users should take into account that this parameter is used for load sharing by the MTP, therefore, the SLS values should be distributed as equally as possible. The MTP guarantees (to a high degree of probability) an in-sequence delivery of messages which con

41、tain the same SLS code. 2 The Cause parameter has, at present, four values: i) Signaling network congested (plus congestion level) ii) User Part Unavailability: unknown. iii) User Part Unavailability: unequipped remote user. iv) User Part Unavailability: inaccessible remote user. 6.2.1 Primitive def

42、inition a) MTP-TRANSFER: The primitive “MTP-TRANSFER” is used between level 4 and level 3 (SMH) to provide the MTP message transfer service (i.e., to transfer STC PDUs from one STC peer entity to the other). b) MTP-PAUSE: The primitive “MTP-PAUSE” indicates to the “Users” the total inability of prov

43、iding the MTP service to the specified destination (see T1.111.1, clause 5). The signaling point is inaccessible via the MTP. The MTP will determine when the signaling point is again accessible and send MTP-RESUME indication. The user should wait for such an indication and meanwhile should not send

44、normal messages to that signaling point. If the remote peer user is thought to be unavailable, that condition may be maintained or cancelled at the local users discretion. c) MTP-RESUME: The primitive “MTP-RESUME indicates to the “User” the ability of providing the MTP service to the specified desti

45、nation (see T1.111.1, clause 5). This primitive corresponds to the destination accessible state as defined in T1.111.4. When the MTP-RESUME indication is given to each user, the MTP does not know whether the remote peer user is available. This is the responsibility of each user. 1-6 T1.674.1-2002 d)

46、 MTP-STATUS: The primitive “MTP-STATUS” indicates to the “Users” the partial inability of providing the MTP service to the specified destination. In the case of signaling link congestion with multiple priorities, the “MTP-STATUS” primitive is used to indicate a change of congestion level. In the cas

47、e of remote user unavailability, the user is responsible for determining the availability of this peer user. The user is cautioned not to send normal traffic to the peer user, because while such peer is unavailable, each message will be delivered but will result in a repeated MTP-STATUS indication.

48、The MTP will not send any further indications about the unavailability or availability of this peer user unless interrupted by an MTP-PAUSE indication, or unless the local user continues to send messages to the peer user. 6.2.2 Parameter definition Table 2/T1.674.1 lists the parameters associated wi

49、th each MTP primitive. The definition of the parameters is as follows: a) Originating Point Code (OPC): The OPC parameter indicates the originating point of the message (see T1.111.4, clause 2.2). NOTE - This parameter is a fixed value per STC entity. b) Destination Point Code (DPC): The DPC parameter indicates the destination point of the message (see T1.111.4, clause 2.2). NOTE - This parameter is a fixed value per STC entity. c) Signaling Link Selection Code (SLS): Selection of the SLS parameter is based on the Sequence Control parameter received in the TRANSFER.r