1、 INTERNATIONAL TELECOMMUNICATION UNION ITU-T Series QTELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Supplement 43(09/2003) SERIES Q: SWITCHING AND SIGNALLING Technical Report TRQ.2415: Transport control signalling requirements Signalling requirements for IP connection control in radio access networ
2、ks Capability Set 1 ITU-T Q-series Recommendations Supplement 43 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
3、CLAUSES APPLICABLE 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 SI
4、GNALLING SYSTEM No. 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 (B
5、ICC) Q.1900Q.1999 BROADBAND ISDN Q.2000Q.2999 For further details, please refer to the list of ITU-T Recommendations. Q series Supplement 43 (09/2003) i Supplement 43 to ITU-T Q-series Recommendations Technical Report TRQ.2415: Transport control signalling requirements Signalling requirements for IP
6、 connection control in radio access networks Capability Set 1 Summary This Supplement to the Q-series of ITU-T Recommendations contains a Technical Report that specifies the general aspects of IP signalling requirements for the development of IP connection control Capability Set 1 (CS-1) in radio ac
7、cess networks. This Technical Report identifies what can be viewed as the capabilities for IP signalling. In addition, it describes the essential features and models useful for the development of functional entity actions in support of IP signalling. Source Supplement 43 to ITU-T Q-series Recommenda
8、tions was agreed on 12 September 2003 by ITU-T Study Group 11 (2001-2004). ii Q series Supplement 43 (09/2003) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T
9、) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four yea
10、rs, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the nece
11、ssary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this publication, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this publication is voluntary. However, the
12、 publication may contain certain mandatory provisions (to ensure e.g. interoperability or applicability) and compliance with the publication is achieved when all of these mandatory provisions are met. The words “shall“ or some other obligatory language such as “must“ and the negative equivalents are
13、 used to express requirements. The use of such words does not suggest that compliance with the publication is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this publication may involve the use of a claimed Intellectu
14、al Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted 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 o
15、f intellectual property, protected by patents, which may be required to implement this publication. However, implementors are cautioned that this 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 thi
16、s publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Q series Supplement 43 (09/2003) iii CONTENTS Page 1 Scope 1 2 References. 1 3 Definitions 2 4 Abbreviations 2 5 Requirements 3 5.1 IP served user generated reference. 3 5.2 Called endpoint address
17、 transport 3 5.3 Performance 3 5.4 Symmetry of connection control 3 5.5 Connection configuration . 3 5.6 Symmetry of information transfer capability . 3 5.7 Essential features of the underlying signalling bearer 4 5.8 Flow control 4 5.9 Independence from underlying signalling bearer. 4 5.10 Independ
18、ence from the IP served user 4 5.11 Extent of control. 4 5.12 Information transfer capability and QoS requirements 4 5.13 Contention resolution . 4 5.14 Error reporting 4 5.15 Unrecoverable failures 4 5.16 Forward and backward compatibility. 4 5.17 Parameters and values for IP connections 5 5.18 IP
19、transfer capabilities 5 5.19 Served user transport information 5 5.20 Support of IP transport types 5 5.21 Connection resource modification 6 5.22 Priority service 6 5.23 Automatic congestion control. 6 6 Architecture of IP signalling. 6 7 IP signalling flows 8 7.1 Successful IP connection establish
20、ment information flows . 8 7.2 Unsuccessful IP connection establishment information flows. 9 7.3 IP connection release information flows 10 7.4 Successful IP connection resource modification information flows 11 7.5 Unsuccessful IP connection resource modification information flows 12 Q series Suppl
21、ement 43 (09/2003) 1 Supplement 43 to ITU-T Q-series Recommendations Technical Report TRQ.2415: Transport control signalling requirements Signalling requirements for IP connection control in radio access networks Capability Set 1 1 Scope This Supplement contains the signalling requirements for the I
22、P connection signalling for the capability set 1 (CS-1) in radio access networks. They support the establishment, maintenance and clearing of virtual connections in an IP network with a common protocol, operating over the NNI signalling bearer protocol stacks. The shaded area of Figure 1 shows the s
23、cope of this Supplement. Q.SUPP.43_F01IP service endpoint IP service endpointScope of IP connection signallingIP connectionIP transport (e.g., RTP/UDP)IPRouter RouterIP addr/ Port No.IP addr/ Port No.Figure 1 Scope and definition of terms used in IP connection signalling 2 References 1 ITU-T Q-serie
24、s Recommendations Supplement 8 (1999), Technical Report TRQ.2400: Transport control signalling requirements Signalling requirements for AAL Type 2 link control capability set 1. 2 ITU-T Q-series Recommendations Supplement 33 (2000), Technical Report TRQ.2401: Transport control signalling requirement
25、s Signalling requirements for AAL Type 2 link control capability set 2. 3 ITU-T Recommendation I.255.4 (1990), Community of interest supplementary services: Priority service. 4 IETF RFC 791 (1981), Internet Protocol. 5 IETF RFC 2460 (1998), Internet Protocol, Version 6 (IPv6) Specification. 6 ITU-T
26、Recommendation X.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 2474 (1998), Definition of the Differentiated Services Field (DS
27、 Field) in the IPv4 and IPv6 Headers. 9 IETF RFC 2597 (1999), Assured Forwarding PHB Group. 10 IETF RFC 2598 (1999), An Expedited Forwarding PHB. 11 IETF RFC 768 (1980), User Datagram Protocol. 2 Q series Supplement 43 (09/2003) 12 IETF RFC 3550 (2003), RTP: A Transport Protocol for Real-Time Applic
28、ations. 13 IETF RFC 2960 (2000), Stream Control Transmission Protocol. 14 IETF RFC 3332 (2002), SS7 MTP3-User Adaptation Layer (M3UA). 15 ITU-T Recommendation Q.1902.4 (2001), Bearer Independent Call Control protocol (Capability Set 2): Basic call procedures. 16 ITU-T Recommendation Q.2630.3 (2003),
29、 AAL type 2 signalling protocol Capability Set 3. 17 ITU-T Recommendation Y.1221 (2002), Traffic control and congestion control in IP-based networks. 3 Definitions This Supplement defines the following terms: 3.1 IP connection: A bidirectional user plane association between two IP signalling endpoin
30、ts. 3.2 IP transport protocol: A transport protocol or a combination of transport protocols operating over IP such as UDP, RTP on UDP. 3.3 IP transport packet size: Length of the payload of the topmost IP transport protocol contained in an IP packet. 3.4 IP service endpoint: A functional entity whic
31、h includes the IP signalling endpoint and the IP served user. 3.5 IP served user: A user of the IP signalling protocol. 3.6 IP signalling endpoint: The termination point of an IP signalling bearer. 3.7 IP signalling protocol: Control plane functions for establishing, modifying and releasing IP conne
32、ctions and the associated maintenance functions. 3.8 IP sink address: Contains the IP address and port number, where the sender expects to receive U-plane information. 3.9 QoS class: A set of QoS attributes of the received and transmitted U-plane information. 4 Abbreviations This Supplement uses the
33、 following abbreviations: Bp Peak Token Bucket Size associated with Rp Bs Sustainable Token Bucket Size associated with Rs DBW Dedicated Bandwidth Transfer Capability DSCP Differentiated Services Code Point IP Internet Protocol IPTC IP Transfer Capability M Maximum allowed Packet Size M3UA SS7 MTP3-
34、User Adaptation Layer NNI Network Node Interface QoS Quality of Service Rp Peak bit rate Q series Supplement 43 (09/2003) 3 Rs Sustainable bit rate RTP Real time Transport Protocol SBW Statistical Bandwidth Transfer Capability SCTP Stream Control Transmission Protocol SS7 MTP-3 Signalling System No.
35、 7, Message Transfer Part Level 3 UDP User Datagram Protocol 5 Requirements The IP signalling endpoint shall include mechanisms for the establishment, modification, maintenance and clearing of IP connections. In CS-1, the IP signalling protocol shall be based on the AAL Type 2 signalling protocol CS
36、-3 16. The IP signalling requirements for capability set 1 (CS-1) are provided in this clause. 5.1 IP served user generated reference The IP signalling endpoint shall provide the transparent transfer of the IP served user generated reference to the IP served user in the forward direction in the esta
37、blishment phase. NOTE The IP served user generated reference may include, for example, a reference to an access channel or radio link. 5.2 Called endpoint address transport The IP signalling shall support transparent transport of the Called Address of the IP service endpoint. The IP signalling shall
38、 support multiple address formats including E.164 7 and X.213 6. The IP signalling protocol shall carry an explicit indication of the address format being used. 5.3 Performance For reasons of signalling performance in environments where mobile handovers are supported: a) the number of messages requi
39、red to establish, modify, maintain and clear IP connections should be kept to a minimum; b) the format of information transferred between served users shall be the same as that defined in ITU-T Rec. Q.2630.3 16; c) the format of the IP signalling protocol information should be chosen to minimize mes
40、sage processing delays at the IP signalling endpoints. 5.4 Symmetry of connection control The IP signalling protocol and procedures shall reflect a peer-to-peer (rather than a master/slave) relationship among the IP signalling endpoints. For example, both ends may request connections with the same p
41、rotocol procedures. 5.5 Connection configuration The IP signalling endpoint shall support handling of single, point-to-point IP connections. 5.6 Symmetry of information transfer capability The IP signalling endpoint shall support asymmetric IP connections. That is, the end-to-end connections shall b
42、e bidirectional where the information transfer capability, for example, in each 4 Q series Supplement 43 (09/2003) direction might be different. Unidirectional IP connections can, therefore, be provided, i.e. connections, which provide zero bandwidth in one direction. 5.7 Essential features of the u
43、nderlying signalling bearer The IP signalling requirements provided in this Supplement are based upon a dependence that an underlying signalling bearer supports: a) assured (error free) data transfer; b) in-sequence delivery of PDUs; and c) an indication of flow control. 5.8 Flow control Upon receip
44、t of a flow control indication, the IP signalling protocol shall reduce/allow increase of the connection establishment requests towards the identified signalling association. 5.9 Independence from underlying signalling bearer The IP signalling protocol design shall be independent from the underlying
45、 signalling bearer. As an example, it shall be possible to carry the IP signalling messages over NNI signalling bearer protocol stacks. As a minimum both SCTP 13 and M3UA 14 shall be supported. 5.10 Independence from the IP served user The IP signalling protocol and procedures shall be independent f
46、rom the IP served user. 5.11 Extent of control The scope of IP signalling responsibility is restricted to control of IP connections. In particular, the appropriate IP resources must be present before an IP connection can be established. 5.12 Information transfer capability and QoS requirements An IP
47、 connection is characterized by its information transfer capability and its QoS class. A default information transfer capability and default QoS class shall be supported. The definition of IP information transfer capability and QoS classes are beyond the scope of this Supplement. 5.13 Contention res
48、olution The IP signalling endpoint shall be able to resolve all contentions with respect to resource allocation and collisions when establishing and modifying IP connections. 5.14 Error reporting The IP signalling endpoint shall include mechanisms for detecting and reporting signalling procedural er
49、rors or other failures detected by the IP signalling endpoint to IP management. Service failures may also be reported to the IP served user. 5.15 Unrecoverable failures The IP signalling endpoint shall include mechanisms for returning the IP protocol instance to a stable state after detection of unrecoverable failures. 5.16 Forward and backward compatibility The IP signalling protocol shall include a forward compatibility mechanism and backward compatibility rules. Q series
