1、 INTERNATIONAL TELECOMMUNICATION UNION ITU-T Series QTELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Supplement 44(09/2003) SERIES Q: SWITCHING AND SIGNALLING Technical Report TRQ.2800: Transport control signalling requirements Signalling requirements for AAL type 2 to IP interworking Capability Set
2、 1 ITU-T Q-series Recommendations Supplement 44 ITU-T Q-SERIES RECOMMENDATIONS SWITCHING AND SIGNALLING SIGNALLING IN THE INTERNATIONAL MANUAL SERVICE Q.1Q.3 INTERNATIONAL AUTOMATIC AND SEMI-AUTOMATIC WORKING Q.4Q.59 FUNCTIONS AND INFORMATION FLOWS FOR SERVICES IN THE ISDN Q.60Q.99 CLAUSES APPLICABL
3、E TO ITU-T STANDARD SYSTEMS Q.100Q.119 SPECIFICATIONS OF SIGNALLING SYSTEMS No. 4, 5, 6, R1 AND R2 Q.120Q.499 DIGITAL EXCHANGES Q.500Q.599 INTERWORKING OF SIGNALLING SYSTEMS Q.600Q.699 SPECIFICATIONS OF SIGNALLING SYSTEM No. 7 Q.700Q.799 Q3 INTERFACE Q.800Q.849 DIGITAL SUBSCRIBER SIGNALLING SYSTEM N
4、o. 1 Q.850Q.999 PUBLIC LAND MOBILE NETWORK Q.1000Q.1099 INTERWORKING WITH SATELLITE MOBILE SYSTEMS Q.1100Q.1199 INTELLIGENT NETWORK Q.1200Q.1699 SIGNALLING REQUIREMENTS AND PROTOCOLS FOR IMT-2000 Q.1700Q.1799 SPECIFICATIONS OF SIGNALLING RELATED TO BEARER INDEPENDENT CALL CONTROL (BICC) Q.1900Q.1999
5、 BROADBAND ISDN Q.2000Q.2999 For further details, please refer to the list of ITU-T Recommendations. Q series Supplement 44 (09/2003) i Supplement 44 to ITU-T Q-series Recommendations Technical Report TRQ.2800: Transport control signalling requirements Signalling requirements for AAL type 2 to IP in
6、terworking Capability Set 1 Summary This Supplement to the Q-series Recommendations contains a Technical Report that specifies the general aspects of AAL type 2 to IP interworking signalling requirements for the development of AAL type 2 to IP signalling interworking Capability Set 1 (CS-1). This Su
7、pplement identifies what can be viewed as the capabilities for AAL type 2 to IP signalling interworking. Source Supplement 44 to ITU-T Q-series Recommendations was agreed on 12 September 2003 by ITU-T Study Group 11 (2001-2004). ii Q series Supplement 44 (09/2003) FOREWORD The International Telecomm
8、unication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them wit
9、h a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Reco
10、mmendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this publication, the expression “Administration“ is used for conc
11、iseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this publication is voluntary. However, the publication may contain certain mandatory provisions (to ensure e.g. interoperability or applicability) and compliance with the publication is ac
12、hieved when all of these mandatory provisions are met. The words “shall“ or some other obligatory language such as “must“ and the negative equivalents are used to express requirements. The use of such words does not suggest that compliance with the publication is required of any party. INTELLECTUAL
13、PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this publication may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asser
14、ted by ITU members or others outside of the publication development process. As of the date of approval of this publication, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this publication. However, implementors are cautioned that this
15、may not represent the latest information and are therefore strongly urged to consult the TSB patent database. ITU 2004 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Q series Supplement 44 (09/2003) iii CONTEN
16、TS Page 1 Scope 1 2 References. 1 3 Definitions 2 4 Abbreviations 2 5 Requirements 3 5.1 General . 3 5.2 Addressing 3 5.3 Mapping of AAL type 2 link characteristics to IP connection characteristics . 3 5.4 Control of AAL type 2 to IP connection conversion 3 5.5 Served user information . 3 5.6 Suppor
17、t of AAL type 2 service specific convergence sublayers 3 5.7 Connection resource modification 4 5.8 QoS. 4 5.9 Signalling protocols 4 5.10 Delay and efficiency requirements. 4 Q series Supplement 44 (09/2003) 1 Supplement 44 to ITU-T Q-series Recommendations Technical Report TRQ.2800: Transport cont
18、rol signalling requirements Signalling requirements for AAL type 2 to IP interworking Capability Set 1 1 Scope This Supplement contains the signalling requirements for the AAL type 2 to IP interworking for the Capability Set 1 (CS-1). These requirements support the establishment, maintenance, modifi
19、cation, and clearing of concatenations of AAL type 2 links with an IP connections in a mixed AAL type 2 and IP environment. It is applicable to closed and controlled IP networks that are connected to AAL type 2 networks. The scope of this Supplement is limited to the requirements of signalling to su
20、pport the shaded area of Figure 1. Q.Suppl.44_F1CID CID SW CIDAAL 2 linkAAL 2 linkIP connectionCID conversionIPAAL type 2 network IP networkA2IP connectionAAL type 2serviceendpoint AAL type 2 switchA2IP interworking unitIPserviceendpointATM VCCAAL 2 path AAL 2 pathATM VCCport#IP addrport#IP addrFigu
21、re 1 Scope and definition of terms used in AAL type 2 to IP signalling interworking 2 References 1 ITU-T Q-series Recommendations Supplement 33 (2000), Technical Report TRQ.2401: Transport control signalling requirements Signalling requirements for AAL type 2 link control capability set 2. 2 ITU-T R
22、ecommendation I.366.1 (1998), Segmentation and Reassembly Service Specific Convergence Sublayer for the AAL type 2. 3 ITU-T Recommendation I.366.2 (2000), AAL type 2 service specific convergence sublayer for narrow-band services. 4 ITU-T Recommendation X.200 (1994), Information technology Open Syste
23、ms Interconnection Basic reference model: The basic model. 5 ITU-T Recommendation X.210 (1993) | ISO/IEC 10731:1994, Information technology Open Systems Interconnection Basic reference model: Conventions for the definition of OSI services. 2 Q series Supplement 44 (09/2003) 6 ITU-T Recommendation X.
24、213 (2001) | ISO/IEC 8348:2002, Information technology Open Systems Interconnection Network service definition. 7 ITU-T Recommendation E.164 (1997), The international public telecommunication numbering plan. 8 IETF RFC 3550 (2003), RTP: A Transport Protocol for Real-Time Applications. 9 IETF RFC 768
25、 (1980), User Datagram Protocol. 10 ITU-T Recommendation Q.2630.1 (1999) AAL type 2 signalling protocol Capability Set 1. 11 ITU-T Recommendation Q.2630.2 (2000) AAL type 2 signalling protocol Capability Set 2. 12 ITU-T Q-series Recommendations Supplement 43 (2003), Technical Report TRQ.2415 Transpo
26、rt control signalling requirements Signalling Requirements for IP connection control in radio access networks Capability Set 1. 13 ITU-T Recommendation I.366.2 (2000), AAL type 2 service specific convergence sublayer for narrow-band services. 3 Definitions This Supplement is based upon the concepts
27、developed in ITU-T Recs X.200 4 and X.210 5.In addition to definitions given in TRQ.2415 12 and TRQ.2401 1, this Supplement defines the following terms: 3.1 A2IP interworking unit: The A2IP interworking unit provides the user plane conversion between AAL type 2 and IP transport (RTP 8 on UDP 9 or UD
28、P 9 only). The interworking unit terminates AAL type 2 links and IP connections. There is no served user associated with an A2IP interworking unit. 3.2 A2IP connection: The logical concatenation of one or more AAL type 2 links and an IP connection between an AAL type 2 service endpoint and an IP ser
29、vice endpoint. From the perspective of a Capability Set 1 (CS-1) 10 and Capability Set 2 (CS-2) 11 AAL type 2 service endpoint, an A2IP connection cannot be distinguished from an AAL type 2 connection. 3.3 A2IP signalling interworking function: The A2IP signalling interworking function resides in an
30、 A2IP interworking unit and provides the interworking between the AAL type 2 signalling protocol and the IP connection control protocol. 4 Abbreviations This Supplement uses the following abbreviations: A2IP AAL type 2 IP AAL ATM Adaptation Layer AAL 2 ATM Adaptation Layer type 2 ATM Asynchronous Tr
31、ansfer Mode CS-1 Capability Set 1 CS-2 Capability Set 2 IP Internet Protocol IWU Interworking Unit Q series Supplement 44 (09/2003) 3 QoS Quality of Service RTP Real-time Protocol SSADT Service Specific Assured Data Transfer sublayer SSSAR Service Specific Segmentation and Reassembly sublayer SSTED
32、Service Specific Transmission Error Detection sublayer UDP User Datagram Protocol 5 Requirements The AAL type 2 to IP signalling interworking requirements for capability set 1 (CS-1) are provided in this clause. 5.1 General The A2IP signalling interworking function shall terminate the AAL type 2 sig
33、nalling and the IP connection control signalling. The signalling shall interwork without direct interactions with either an AAL type 2 served user or an IP served user. The A2IP signalling interworking function shall provide signalling support for the user plane conversion between AAL type 2 and IP
34、transport. 5.2 Addressing The A2IP signalling interworking function shall provide the mapping of the Destination Service Endpoint Address. Values may be passed through unchanged or with format conversion (E.164 7 to X.213 6 and vice versa) or derived by address translation from the received destinat
35、ion service endpoint address. 5.3 Mapping of AAL type 2 link characteristics to IP connection characteristics The A2IP signalling interworking function shall provide the mapping of IP connection characteristics parameters and AAL type 2 link characteristics parameters. 5.4 Control of AAL type 2 to I
36、P connection conversion The signalling support for the user plane conversion between AAL type 2 and IP transport shall take into account any signalling parameters relevant to the user plane conversion, e.g. there may need to be some form of segmentation/re-assembly function. 5.5 Served user informat
37、ion The A2IP signalling interworking function shall transparently convey information that is only of relevance to served users like: a) Served user transport information; b) Served user generated reference information; i.e. without changes in content or format and without examination. 5.6 Support of
38、 AAL type 2 service specific convergence sublayers Support of I.366.2 3, 13 is beyond the scope of this Supplement. Support of I.366.1 2 Service Specific Transmission Error Detection sublayer (SSTED) and Service Specific Assured Data Transfer sublayer (SSADT) is beyond the scope of this Supplement.
39、I.366.1 2 Service Specific Segmentation and Reassembly sublayer (SSSAR) shall be supported by the A2IP signalling interworking function. 4 Q series Supplement 44 (09/2003) 5.7 Connection resource modification The A2IP signalling interworking function shall support the interworking of connection reso
40、urce modifications initiated by either served user associated with an A2IP connection. 5.8 QoS The A2IP signalling interworking function shall provide the mapping of IP QoS parameters and ATM / AAL type 2 QoS parameters. 5.9 Signalling protocols The signalling protocol in the AAL type 2 network shal
41、l be Q.2630.2 11. The signalling protocol controlling the IP connection shall be a protocol based on the requirements in TRQ.2415 12. 5.10 Delay and efficiency requirements Operation of the A2IP signalling interworking function must be as efficient as possible to support applications where terminal
42、handovers are required. The following items shall be taken into consideration to optimize performance: processing and conversion of AAL 2 to IP (and vice versa) messages (i.e. minimal delay); external interaction should be kept to a minimum. Geneva, 2004 SERIES OF ITU-T RECOMMENDATIONS Series A Orga
43、nization of the work of ITU-T Series B Means of expression: definitions, symbols, classification Series C General telecommunication statistics Series D General tariff principles Series E Overall network operation, telephone service, service operation and human factors Series F Non-telephone telecomm
44、unication services Series G Transmission systems and media, digital systems and networks Series H Audiovisual and multimedia systems Series I Integrated services digital network Series J Cable networks and transmission of television, sound programme and other multimedia signals Series K Protection a
45、gainst interference Series L Construction, installation and protection of cables and other elements of outside plant Series M TMN and network maintenance: international transmission systems, telephone circuits, telegraphy, facsimile and leased circuits Series N Maintenance: international sound progr
46、amme and television transmission circuits Series O Specifications of measuring equipment Series P Telephone transmission quality, telephone installations, local line networks Series Q Switching and signalling Series R Telegraph transmission Series S Telegraph services terminal equipment Series T Ter
47、minals for telematic services Series U Telegraph switching Series V Data communication over the telephone network Series X Data networks and open system communications Series Y Global information infrastructure, Internet protocol aspects and Next Generation Networks Series Z Languages and general software aspects for telecommunication systems
