1、INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOM MUN I CATI ON STAN DARD IZATION SECTOR OF ITU Q.2965.2 (I 2/1999) SERIES Q: SWITCHING AND SIGNALLING Broadband ISDN - B-ISDN application protocols for access Sig na1 I i ng Digital subscriber signalling system No. 2 - Signalling of individual Quali
2、ty of Service pa ram e te rs ITU-T Recommendation Q.2965.2 (Formerly CCITT Recommendation) STD-ITU-T RECMN Q.27b5-2-ENGL 1777 D 48b257L Ob83777 220 D ITU-T Q-SERIES RECOMMENDATIONS SWITCHING AXD SIGNALLING SIGNALLING IN THE INTERNATIONAL MANUAL SERVICE FUNCIONS AND INFORMATION FLOWS FOR SERVICES IN
3、THE ISDN SPECIFICATIONS OF SIGNALLING SYSTEMS No 4 AND No. 5 SPECIFICATIONS OF SIGNALLING SYSTEM No 6 SPECIFICATIONS OF SIGNALLING SYSTEM R1 SPECIFICATIONS OF SIGNALLING SYSTEM R2 DIGITAL EXCHANGES INTERWORKmG OF SIGNALLIhG SYSTEMS SPECIFICATIONS OF SIGNALLING SYSTEM No. 7 DIGITAL SUBSCRIBER SIGNALL
4、ING SYSTEM No. 1 PUBLIC LAND MOBILE NETWORK INTERWOKKING WITH SATELLITE MOBILE SYSTEMS INTELLIGENT NETWORK BROADBAND ISDN INTERNATION AL AUTOMATIC 4ND SEMI-AUTOMATIC WORKING CLAUSEIS APPLICABLE TO ITU-T STANDARD SYSTEMS SIGNALLING REQUIREMENTS AND PROTOCOLS FOR IMT-2000 General aspects Signalling AT
5、M adaptation layer (SAAL) Signalling network protocols Common aspects of B-ISDN application protocols for access signalling and network signalling and intenvorking B-ISDN application protocols for the network signalling applic Q. 1-4.3 Q.4-Q. 5 9 Q. 6 all users of this Recommendation are therefore e
6、ncouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently valid ITIJ-T Recommendations is regularly published. 1 2 3 4 ITIJ-T Recommendation 1.413 (1993), B-ISDN user-network interface. ITIJ-T Recomm
7、endation 1.356 (2000), B-ISDN ATM layer cell transfer performance. ITIJ-T Recommendation Q.2965.1 (1999), Digital subscriber signalling system No. 2 - Support of Qualiw of Service classes. ITIJ-T Recommendation Q.2931 (1995), Digital subscriber signalling system No. 2 (DSS2) - User network interjke
8、(UN4 - Layer 3 specification for basic caWconnection control and its Amendments 1, 2, 3 and 4. ITLJ-T Recommendation Q.2971 (1 999, Digital subscriber signalling systems No. 2 (DSS2) - User-network intece layer 3 specification for point-to-multipoint caWconnection control. ITIJ-T Recornmendation 1.3
9、71 (2000), TrafJic control and congestion control in B-ISDN. ITU-T Recommendation 4.2961.1 (1 995), Digital subscriber signalling system No. 2 - Additionul traf$c. parmneters - Additional signalling capabilities to support trafic parameters for the tagging option and the sustainable cell rate parame
10、ter set. 5 6 J 7 J STD-ITU-T RECMN Q*29b5*2-ENGL 1999 = 48b2591 Ob83983 524 D ITU-T Recommendation Q.2961.2 (1 997), Digital subscriber signalling system No. 2 - Additional traf$c parameters - Support of ATM transfer capability in the broadband bearer capa bility in formation element. ITU-T Recommen
11、dation 4.296 1.3 (1 997), Digital subscriber signalling system No. 2 - Additional traffic parameters - Signalling capabilities to support trafic parameters for the available bit rate (ABR) ATM transfer capability. ITU-T Recommendation Q.2961.4 (1 997), Digital subscriber signalling system No. 2 - Ad
12、ditional trafic parameters - Signalling capabilities to support trafic parameters for the ATM Block Transfer (ABT) ATM transfer capability. ITU-T Recommendation Q.2961.6 (1998), Digital subscriber signalling system No. 2 - Additional traffic parameters -Additional signalling procedures for the suppo
13、rt of the SBR2 and SBR3 ATM transfer capabilities. ITU-T Recommendation Q.2934 (1 998), Digital subscriber signalling system No. 2 - Switched virtual path capability. ITU-T Recommendation Q.295 1 (1999, Stage 3 description for number identification supplementary services using B-ISDN digital subscri
14、ber signalling system No. 2 (DSS2) - Basic call. ITU-T Recommendation 4.2957.1 (1 999, Stage 3 description for additional information transfer supplementary services using B-ISDN digital subscriber signalling system No. 2 (DSS2) -Basic call: User-to-User signalling (UUS). ITU-T Recommendation 4.2955
15、.1 (1 997), Stage 3 description for community of interest supplementary services using B-ISDN digital subscriber signalling system No. 2: Closed user group (CUG). ITU-T Recommendation 4.2962 (1994, Digital subscriber signalling system No. 2 - Connection characteristics negotiation during callhonnect
16、ion establishment phase. ITU-T Recommendation Q.2963.1 (1 999), Digital subscriber signalling system No. 2 - Connection modification: Peak cell rate modijcation by the connection owner. ITU-T Recommendation Q.2963.2 (1997), Digital subscriber signalling system No. 2 - Connection modification: Modijz
17、cation procedures for sustainable cell rate parameters. ITU-T Recommendation Q.2963.3 (1998), Digital subscriber signalling system No. 2 - Connection modification: ATM traffic descriptor modjkation with negotiation by the connection owner. ITU-T Recommendation Q.2764 (1 999), Broadband integrated se
18、rvices digital network (B-ISDN) -Signalling system No. 7 B-ISDN user part (B-ISUP) - Basic call procedures. Definitions The definitions of ITU-T Recommendations Annex J/Q.2931 4 and Q.2965.1 3 apply. In addition, the definitions of QoS parameters as defined in ITU-T Recommendation 1.356 2 apply. In
19、the following text of this ITU-T Recommendation the term “individual QoS parameters“ includes the QoS parameters cell delay variation and cell loss ratio according to ITU-T Recommendation 1.356 2, while the term “end-to-end transit delay“ includes the QoS parameter cell transfer delay according to I
20、TU-T Recommendation 1.356 2. STD-ITU-T RECMN Q-Zqb5.2-ENGL 1999 YBb257L Ob8398Y Yb0 4 Abbreviations The abbreviations of ITU-T Recommendations Annex J/Q 2931 4 and Q.2965.1 3 apply. For the purpose of this ITU-T Recommendation, the following abbreviations apply in addition: CDV Cell Delay Variation
21、CLR Cell Loss Ratio CD Cell Transfer Delay 5 Description This pari specifies extension to ITU-T Recommendation 4.2965.1 3 in order to enable the optional signalling of Quality of Service (QoS) parameters as defined in ITU-T Recommendation 1.356 2. While establishing a new ATM connection (VP or VC),
22、the calling user at the TB reference point can optionally signal the individual QoS parameters CDV and CLR in addition to the mandatory signalling of the QoS class as per ITU-T Recommendation Q.2965.1 3. For the end-to-end transit delay procedures, extensions to ITU-T Recommendation 4.2931 4 are pro
23、vided in order to allow the signalling of the origin of the generation of the end-to-end transit delay values. The signalling of these QoS parameters is predicated upon the signalled QoS class (see Annex A). 6 Operation requirements 6.1 Provision and withdrawal Signalling of the End-to-transit delay
24、 information element is available as part of the basic call (see ITU-T Recommendation Q.2931 4). The user may signal individual QoS parameters at the Ts reference point as specified in this ITU-T Recommendation without any prior arrangement with the service provider. Signalling of the Extended QoS p
25、arameters information element shall be restricted to the TB reference point. 6.2 See subclause 6.1/Q.2965.2. Requirements at the originating network side 6.3 See subclause 6. UQ.2965.2. Requirements at the terminating network side 7 Primi tives No new primitives are required to support this capabili
26、ty. 8 Coding requirements This clause specifies additions and modifications to the Q.293 1 messages and information elements in order to support signalling of QoS parameters in addition to the signalling of the QoS class as described in ITIJ-T Recommendation Q.2965.1 3. STD-ITU-T RECMN Q.27b5-2-ENGL
27、 1779 48b257L Ob83785 3T7 8.1 Modified message contents 8.1.1 CONNECT This message is sent by the called user to the network and by the network to the calling user to indicate call acceptance by the called user. See Table 8-1 below for additions and modifications to the structure of this message fro
28、m that shown in Tables 3-4Q.2931 4, 3-1514.2931 4 and Information Element Reference Direction Type Length Extended QoS parameters 8.2.2 Both O (Note) 4-13 NOTE - May be included in the user-to-network direction at the TB reference point when the called user received this information element in the S
29、ETUP message and the origin of the information element was the calling user. Shall be included in the network-to-user direction at the TB reference point if the network received this information element in the connect indication. The origin sub-field (octet 5) in the Extended QoS parameters informat
30、ion element is not significant in the CONNECT message. I 8-4/Q.2971 5. Information Element Reference Extended QoS parameters 8.2.2 Table 8-UQ.2965.2 - CONNECT Message Additional Contents Direction Type Length Both O (Note) 4-25 8.1.2 SETUP This message is sent by the calling user to the network and
31、by the network to the called user to initiate B-ISDN call and connection establishment. See Table 8-2 below for additions to the structure of this message from that shown in Tables 3-8/Q.2931 4, 3-19/Q.2931 4 and 8-YQ.2971 5. Table 8-2/Q.2965.2 - SETUP Message Additional Contents 8.2 Information ele
32、ments 8.2.1 End-to-end transit delay The purpose of the End-to-end transit delay information element is to indicate the nominal maximum end-to-end transit delay acceptable on a per-call basis, and to indicate the cumulative transit delay to be expected for a virtual channel connection. Transit delay
33、 is the end-to-end one-way transit delay of user data transferred during the data transfer phase on the user plane, between the calling user and the called user. It includes (see B.1/1.3562): STDgITU-T RECMN Q-29b5-2-ENGL 1999 m 48b2591 Ob8398b 233 m the total processing time in the end user systems
34、 (e g. processing time, AAL handling delay, - the cell transfer delay (CTD) as defined in ITU-T Recommendation I356 121 ATM cell assembly delay, and possibly any additional processing delay); and (e.g. propagation delay, ATM layer transfer delay, possibly any additional processing delay in the netwo
35、rk). The Cumulative transit delay value indicated by the calling user in the SETUP message (if present) includes the cumulative transit delay from the calling user to the network boundary. The cumulative transit delay value indicated by the network in the SETUP message sent to the called user is the
36、 sum of the value which was indicated at the originating UNI and the expected transfer delay accumulated within the network. It does not include further transfer delay on the way from the network boundary to the called user. The cumulative transit delay value which is transferred over both UNIS in t
37、he CONNECT message is the expected total end-to-end transit delay value for user data transfer over the related virtual channel connection as provided for a given call. The maximum end-to-end transit delay value may be indicated by the calling user to specify end-to- end transit delay requirements f
38、or this call. In this case, the maximum end-to-end transit delay includes the end user delay (e.g. AAL handling delay) in addition to the CTD as defined in ITU-T Recommendation 1.356 2. This field is included by the network in the SETUP message to indicate that the calling user has specified end-to-
39、end transit delay requirements for this call. The maximum end-to-end transit delay is not included in the CONNECT message. The end-to-end transit delay is coded as shown in Figure 1 and Table 1. The maximum length of this information element is 1 1 octets. 8 7 6 5 4 3 2 1 Octets End-to-end transit d
40、elay information element identifier Information Element Instruction Field Information Element Action Ind. Standard Flag Res. Leneth of end-to-end transit delav contents I Idenah of end-to-end transit delav contents (continued) Cumulative transit delay identifier Cumulative transit delav value (conti
41、nued) 5.2 O O O O O 1 Maximum end-to-end transit delay identifier Io Maximum end-to-end transit delay value Maximum end-to-end transit delay value (continued) Network generated indicator (Notc) - NOTE - included at the B reference point if and only if the origin of this information element IS other
42、than the calling user within the private network. This sub-field may be present only in a SETUP message at the TB reference point. Figure l/Q.2965.2 - End-to-end transit delay information element STDmITU-T RECMN Q.29b5-2-ENGL 1999 4Ab259L UbA3787 17T Table WQ.2965.2 - End-to-end transit delay inform
43、ation element _ _ _ - Cumulative transit delay value (octets 5.1 and 5.2) The cumulative transit delay value is binary encoded in milliseconds. The coding rules for integer values described in 4.5.1 apply. The cumulative transit delay value occupies 16 bits total. - Maximum end-to-end transit delay
44、value (octets 6.1 and 6.2) The maximum end-to-end transit delay value is binary encoded in milliseconds. The coding rules for integer values described in 4.5.1 apply. The maximum end-to-end transit delay value occupies 16 bits total. The value “1 11 1 1 1 1 1 1 11 1 11 1 l“, however, is not to be in
45、terpreted as a maximum end-to-end transfer delay value. This codepoint indicates: “any end-to-end transit delay value acceptable; deliver cumulative end-to-end transit delay value to the called user“. The presence of this sub-field indicates the origin of this information element is other than the c
46、alling user within the private network. If this sub-field is not present, then the origin of this information element is the calling user within the private network (so the called user can assume that the received cumulative values are end-to-end values including the user handling delays in addition
47、 to the CTD as defined in lTU-T Recommendation 1.356). However, note that this assumption is not fully reliable as there may be implementations according to earlier versions which do not use the network-generated indicator in octet 7 according to this ITU-T Recommendation. - Network-generated indica
48、tor (Octet 7) 8.2.2 Extended QoS parameters The purpose of the Extended QoS parameters information element is to indicate individual QoS parameter values acceptable on a per call basis and to indicate the cumulative QoS parameter values. The relevant QoS parameters applicable to user data transferre
49、d during the data transfer phase on the user plane are defined in ITU-T Recommendation 1.356 2. The Extended QoS parameter information element is coded as shown in Figure 2 and Table 2. The maximum length of this information element is 25 octets. STDSITU-T RECMN Q-27b5*2-ENGL 1777 qBb257L Ob83788 OUb Length of Extended QoS parameters contents I h 7 6 5 4 3 2 1 Octets 3 Extended QoS parameters Information element identifier I 1 O I 1 Length ot Exte
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