1、ETS 300 102-2 December 1990 UDC: 621.395 Key words: ISDN, layer 3, basic call control Integrated Services Digital Network (ISDN); User-network interface layer 3 Specifications for basic call control Specification Description Language (SDL) diagrams ETSI European Telecommunications Standards Institut
2、e ETSI Secretariat: B.P.152 . F - 06561 Valbonne Cedex . France TP. + 33 92 94 42 O0 TF. + 33 93 65 47 16 Tx. 47 O0 40 F European Telecommunications Standards Institute 1 990. All rights reserved. No part may be reproduced or used except as authorised by contract or other written permission. The cop
3、yright and the foregoing restriction on reproduction and use extend to ail media in which the information may be embodied. 3404583 0025028 L Page 3 ETS 300 102-2:1990 Contents Foreword . 5 Scope 7 2 Normative references 7 3 Explanation of symbols . 7 1 4 User side and network side call states . 9 Ne
4、twork side SDLs - Overview 10 5.1 Network side call states 10 5 . 5.2 Network side SDLs - Block diagram 11 5.3 Network side SDLs - List of primitives 11 5.4 Network side SDLs - Representation method 12 6 User side SDLs - Overview 15 6.1 User side call states 15 6.2 User side SDLs - Block diagram 16
5、6.3 User side SDLs - List of primitives 16 7 Graphical SDL diagrams 17 7.1 Network side SDL diagrams . 18 7.2 User side SDL diagrams . 55 Page 4 ETS 300 102-2: 1990 Blank page Page 5 ETS 300 102-2:1990 Foreword This European Telecommunications Standard (ETS) was produced by the Signalling, Protocols
6、 and Switching (CPS) Technical Committee of the European Telecommunications Standards Institute (ETSI), and was adopted, having passed through the ETSI standards approval procedure. This document is part 2 of a multi-part ETS, comprised as follows: ETS 300 102-1: ETS 300 102-2: ISDN; User-network in
7、terface layer 3; Specifications for basic call control. ISDN; User-network interface layer 3; Specifications for basic call control; Specification Description Language (SDL) diagrams. = 3404583 0025031 1 E Page 6 ETS 300 102-2: 1990 Blank page , Page 7 ETS 300 102-2:1990 1 Scope This ETS specifies,
8、using SDL representation, the circuit-switched call control procedures of the Digital Subscriber Signalling one (DSS1) as specified in clause 5 of ETS 300 102-1 i1 I. In order to describe the point-to-multipoint operation of the protocol, the concept of a “global“ process running in parallel with a
9、number of “individual“ (dynamic) processes in the network side has been introduced. This approach, and the associated definition of internal primitives is intended to provide a coherent description of the protocol and does not constrain implementations. The text description in clause 5 of ETS 300 10
10、2-1 i11 is definitive. 2 Normative references This ETS incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications listed hereafter. For dated references, subsequent amendments to, or
11、revisions of any of these publications apply to this ETS only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. 11 1 r21 r31 ETS 300 102-1 (1 990): “ISDN User-network interface layer 3; Specification for basic call con
12、trol“. CCIlT Recommendation 2.1 O0 (1 988): “Functional Specification and Description Language (SDL)“. CCIlT Recommendation Q.931 (1 988): “ISDN User-network interface layer 3 Specification for basic call control“. 3 Explanation of symbols The symbols and abbreviations shown below are used within th
13、is description. A full description of the symbols and their meaning and application is given in CCITT Recommendation 2.100 21. State symbol O I Input symbol (event occurrence) Output symbol (signal generation - which will lead to an associated event occurrence) /7 U O Save symbol (save event until c
14、ompletion of a transition) Task symbol Decision symbol Page 8 ETS 300 102-2:1990 3404583 0025033 5 Procedure call symbol A Transition option symbol (implementation option) Procedure start symbol Procedure return symbol Create request symbol (used to inititate an individual network side transaction)
15、X O a Stop symbol (used to end an individual network side transaction) Connection symbol Used to mark an input or output which is local to the Layer 3 entity and which is required as a result of the representation approach adopted. I W 3404583 0025034 7 = , Page 9 ETS 300 102-2:1990 4 User side and
16、network side call states This section shows which call states are applicable at the user and network sides during the various phases of a call. Table 1: Call states Call state User Network Call phase + u0 NO Null Call Initiated Overlap Sending Outgoing Call Proceeding Call Delivered u1 u2 u3 u4 N1 N
17、2 N3 N4 OUTGOING CALL (from user) Call Present Overlap Receiving Incoming Call Proceeding Call Received Connect Request U6 U2 5 u9 u7 U8 N6 N2 5 N9 u7 N8 Active u10 N10 u11 u12 u19 - N11 N12 N19 N22 Disconnect Request (clearing by the user) Disconnect Indication (clearing by the network Release Requ
18、est Call Abort CALL SUSPEND/ RESUME Suspend Request U15 U17 N15 N17 Resume Request RESTART PROCEDURE (NOTE) Null Restart Resume Request RESTO REST1 U17 RESTO REST1 N17 NOTE: These states relate to global call references and are applicable when the restart procedures are used. They may exist in both
19、user and network sides. m 3404583 0025035 9 Number Page 10 ETS 300 102-21990 Name 5 5.1 Network side call states Network side SDLs - Overview _ NO N1 N2 N3 N4 N6 N7 N8 N9 N10 N11 N12 N15 N17 N19 N22 N25 NOTE 1: Network side Table 2 Null Call Initiated Overlap Sending Outgoing Call Proceeding Call De
20、livered Call Present Call Received Connect Request Incoming Call Proceeding Active Disconnect Request Disconnect Indication Suspend Request Resume Request Release Request Call Abort Overlap Receiving timers, and the states in which NOTE 2: Events in each state which lead to normal call establishment
21、 and clearing are marked with the ci+rr symbol. The primitives which pass to and from the call control block are shown for guidance only and are not fully specified. NOTE 4: Internal primitives are marked by These are a result of the representation method that has been adopted. NOTE 3: 3404583 00250
22、3b O I . Page 11 FTS 300 102-2:1990 5.2 Network side SDLs - Block diagram Resource control management Primitives Procedure Messages to/from User side Block described - by the SDL diagrams v Data link layer Physical layer I User-network interface * not described in User ) the SDL diagrams NOTE: Contr
23、ol of B-channels is described in these SDL diagrams as part of the CCIlT Recommendation 0.931 i31 protocol block. Figure 1 5.3 Network side SDLs - List of primitives Table 3 From Call Control Block ALERTING REQUEST DISCONNECT REQUEST. INFO REQUEST MORE INFO REQUEST NOTIFY REQUEST PROCEEDING REQUEST
24、PROGRESS REQUEST REJECT REQUEST RELEASE REQUEST RESUME REJECT REQUEST RESUME RESPONSE SETUP COMPLETE REQUEST SETUP REQUEST SETUP RESPONSE STATUS ENQUIRY REQUEST SUSPEND REJECT REQUEST SUSPEND RESPONSE To Call Control Block ALERTING INDICATION DISCONNECT INDICATION INFO INDICATION MORE INFO INDICATIO
25、N NOTIFY INDICATION PROCEEDING INDICATION PROGRESS INDICATION REJECT INDICATION RELEASE CONFIRM RELEASE INDICATION RESUME INDICATION SETUP CONFIRM SETUP INDICATION STATUS INDICATION SUSPEND INDICATION TIMEOUT INDICATION W 3404583 0025037 2 W Page 12 ETS 300 102-2:1990 5.4 In order to describe the po
26、int-to-multipoint operation of the protocol, the concept of a “global“ process running in parallel with a number of “individual“ (dynamic) processes in the network side has been introduced, This approach, and the associated definition of internal primitives, IS intended to provide a coherent descrip
27、tion of the protocol and does not constrain implementations. The text description in clause 5 of ETS 300 102-1 11 1 is definitive. Individual processes are used to track the responses of each terminal. The global (controlling) process runs in parallel with the (dynamically created/destroyed) individ
28、ual process. The global and individual processes communicate by means of internal primitives. These are related to layer 3 message types and are defined in Table 4. The internal primitives represent instantaneous actions. Thus there is no possibility of errors caused by the crossover of primitives.
29、The global process maintains a list of recorded Connection Endpoint Suffix (CES) values to enable it to manage the individual processes. In this representation the global process also keeps a record of the state of the individual process associated with each responding terminal. Additionally a “pres
30、elected“ CES is recorded when one terminal responds with a CONNECT message and this becomes the “selected“ CES when the terminal is awarded the call. This solution is compatible with point-to-point working. In this case the global process never creates any individual processes. Individual processes
31、may exist in the following states: Network side SDL diagrams - Representation method NO N7 Call Received N8 Connect Request N9 Incoming Call Proceeding N19 Release Request N25 Overlap Receiving Null (processes are created in this state) Two sets of SDLs are required for these states to show the glob
32、al and individual processes. The global process handles all communications with call control. Messages from individual terminals are sent to the individual process for that terminal if one exists (.e. if the CES is recognised). Messages with an unrecognised CES are passed to the global process. Mess
33、ages with the selected CES are also sent to the global process. TO MEANING. = 3404583 0025038 4 Page 13 ETS 300 102-2: 1990 Table 4: Network side layer 3 internal primitives FROM PRIMITIVES NAME When global process receives ALERTING it starts an individual process and sends it 1NT.ALERTING REQ etc 1
34、NT.ALERTING REQ 1NT.CONNECT REQ INT.CALL PROC REO INT. SETUP ACK REO Global Individual Global Sent on receipt of ALERTING (etc). 1NT.ALERTING IND 1NT.CONNECT IND 1NT.CALL PROC INC fndividual Individual Sent when the global process terminates a individual process END PROCESS Global individual Global
35、Instructs individual process to release terminal (e.g. for releasing non- selected terminals) Informal global process that a temi na1 has begun to release 1NT.RELEASE REQ 1NT.RELEASE IND E ndividual Global Individual Sent on receipt of INFO REQ INT.INF0 REQ INT.INF0 IND I: ndividual Global Sent on r
36、eceipt of INFO 1NT.PROGRESS IND Cndividual Global Sent on receipt of PROGRESS Cndividual Global Sent to indicate that the individual has cleared INT . REL. COW ,IND NOTE: The global process should not release the call reference until all individual processes have completed clearing. Figure 2 (arrow
37、diagram) shows an example of this representation method 3404583 0025039 b W Fage 14 ETS 300 102-21990 n i a: al 1 I 1 wi l I P I $fi -I E: 2; E tl 1-1 I WI l l a i i Pi n: U: w: i2:m WI l;M, u; xa alci u) CI CI u1 u1 wi WI I i ZI ZI 01 ai ni l -1 CI Iyl wio dI 1-1 I I l 1-1 , l 1 I 1 AI II II Il II
38、z u; 8: I 1 I I I I I I b :m + z 2 O0 +a xi al: i: i iwi 0: AI I I I I II I I I I I I I I I I I I I I ia II II I IW I lm IWI ll II IV) le IWI tu 1* Id 1-1 IW ici IWI IWi I I. Id1 IC l ICI I I I I I I I I I I I I l I I I .I I I I I I l I I I I I I I I I I l I I1 I I I II LI II ci lai iai 11 l I I -1
39、iwi 121 Ci 1-1 u1 lbl wi imi IWI l li11 01 u1 I .I iai I I ll wi u1 :w l: 2: I IWI 1IyI IZI 1-1 lb* 1IyI IWI ldl I .I ICI 121 1-1 II Il II :W: ni ni II I wi i5 n ;o WI u* dl 2 wi w I I I I l .I I I I I I WI I -1 CI ml 5: e: II I I : :z :o-* IV I 1 I I Al I- l I I I I I I l I wi Ci Iyl WI 1 I l CI u1
40、 w1 E: Bi q 0: I =I CI WI mi I ni I I I l l I I M I 1 4 I I I- I l I I I I l I l l I I I I l I I I I 1 I 1 I l I ! I I I N I I I I I I l I l V d I I I C I mi: L E: C “: 1- I l I .- I I I ai I 1 I .r E L al C 3404583 0025040 2 Number u0 u1 u2 u3 u4 U6 i Page 15 ETS 300 102-2:1990 Name Null Call Initi
41、ated Overlap Sending Outgoing Call Proceeding Call Delivered Call Present 6 6.1 User side call states User side SDLs - Overview u7 U8 Table 5 Call Received Connect Request u9 u10 u11 u12 U15 U17 Incoming Call Proceeding Active Disconnect Request Disconnect Indication Suspend Request Resume Request R
42、elease Request I u19 I U2 5 Overlap Receiving NOTE 1: User side timers, and the states in which they run, are specified in clause 9 of ETC 300 102-1 i. NOTE 2: Events in each state which lead to normal call establishment/clearing are shown by the ii+ii. symbol. NOTE 3: Primitives passed to and from
43、the call control (user application) block are shown for guidance only and are not fully specified. 3404583 0025043 4 -: Page 16 ETS 300 102-2:1990 6.2 User side SDLs - Block diagram * Call Resource Control Management A A Procedure Call Block 4.931 Protocol Control -described by the SDL Messages to/f
44、rom diagrams Network side , Data Link Layer Physical Layer I * not described in the SDL diagrams user-network Interface NOTE: Control of B-channels is described in these SDL diagrams as part of the 0.931 31 protocol block. Figure 3 6.3 User side SDLs - List of primitives Table 6 I From Call Control
45、Block ALERTING REQUEST DISCONNECT REQUEST INFO REQUEST MORE INFO REQUEST NOTIFY REQUEST PROCEEDING REQUEST PROGRESS REQUEST REJECT REQUEST RELEASE REQUEST RESUME REQUEST SETUP REQUEST SETUP RESPONSE -STATUS ENQUIRY REQUEST SUSPEND REQUEST To Call Control Block ALERTING INDICATION DISCONNECT INDICATI
46、ON ERROR INDICATION INFO INDICATION MORE INFO INDICATION NOTIFY INDICATION PROCEEDING INDICATION PROGRESS INDICATION REJECT INDICATION RELEASE CONFIRM RELEASE INDICATION RESUME CONFIRM SETUP COMPLETE INDICATION SETUP CONFIN4 SETUP INDICATION STATUS INDICATION SUSPEND CONFIRM E 3404583 O025042 b E I
47、Page 17 ETS 300 102-21990 7 Graphical SDL diagrams This clause is separated into two parts: 7.1 7.2 Network side SDL diagrams (figures 4 - 40); User side SDL diagrams (figures 41 - 62). Figures 60 to 62, of subclause 7.2, show detailed SDL diagrams for the global call reference to be applied to both
48、 user and network sides. Although these are drawn as user side only, the same diagrams can be applied to the network side by changing the direction of the input and output symbols. All references in the following diagrams are to ETS 300 102-1 l I. m 3404583 0025043 8 m + Page 18 ETS 300 102-2:1990 +
49、 7.1 Network side SDL diagrams ESTABLISH I CR I I EsT;ysHI INDICATIC!N w “I I T302 I 8 ALERTING (-) * SSA ? Y STOP ANY APPLIED INFO MICATION I I START T302 o o 5.3.3 5.1.5.2 5.1.4 5.3.4 “I INDICATION g - (7) Figure 7: Network side SDL diagram 3404583 0025047 5 m! I Page 22 ETS 300 102-21990 + I+ I I RELEASE $ 6.8.4 6.3.4 6.1.6 I I I START I TY I START x START Figure 8: Network side SDL diagram Page 23 ETS 300 102-2:1990 pr-) WIVERED 5.1.6 5 5 5.1.8 5.8.4 5.3.3 I i PRORESC INDICATION E PEEQlE
