1、 I n t e r n a t i o n a l T e l e c o m m u n i c a t i o n U n i o n ITU-T Series Q TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Supplement 68 (12/2015) SERIES Q: SWITCHING AND SIGNALLING Technical Report on emergency telecommunications service (ETS) interoperability limitations ITU-T Q-series
2、Recommendations Supplement 68 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 APPLICABLE TO ITU-T STANDAR
3、D 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 No. 1 Q.850Q.999 PU
4、BLIC 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 BROADBAND ISDN Q.
5、2000Q.2999 SIGNALLING REQUIREMENTS AND PROTOCOLS FOR THE NGN Q.3000Q.3899 TESTING SPECIFICATIONS Q.3900Q.4099 For further details, please refer to the list of ITU-T Recommendations. Q series Supplement 68 (12/2015) i Supplement 68 to ITU-T Q-series Recommendations Technical Report on emergency telec
6、ommunications service (ETS) interoperability limitations Summary New capabilities in modern terminals and public communication networks, such as sharing multimedia, exchanging location and status information, and call transfer, could be used by emergency telecommunications service (ETS) users in cro
7、ss-borders operations (i.e., between national networks). Supplement 68 to ITU-T Q-series Recommendations is a Technical Report (TR) that aims to identify how the use of such features by ETS users could be problematic because of limitations in the international interoperability of ETS, beyond technol
8、ogy-to-technology priority mapping. The TR comprises: An initial comprehensive list of ETS-related functional requirements and capabilities analysed in the Report. Identification of resulting limitations of ETS interoperability: Interfaces between ETS national implementations (ENIs) supporting the E
9、TSs considered; Interoperability problems foreseen due to current lack of support for such telecommunication services in ENIs with different technologies. The description of limitations includes both a technical analysis of standardized interfaces and use cases to illustrate the involved operations.
10、 History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T Q Suppl. 68 2015-12-15 11 11.1002/1000/12787 Keywords Emergency telecommunication service, ETS, ETS interoperability, ETS limitations, multiCONF, NNI. * To access the Recommendation, type the URL http:/handle.itu.int/ in the a
11、ddress field of your web browser, followed by the Recommendations unique ID. For example, http:/handle.itu.int/11.1002/1000/11830-en. ii Q series Supplement 68 (12/2015) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunicatio
12、ns, information and communication technologies (ICTs). 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 with a view to standardizing telecommunications
13、 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 Recommendations is covered by the procedure laid
14、 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 conciseness to indicate both a telecommunication
15、 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 achieved when all of these mandatory provisi
16、ons 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 PROPERTY RIGHTSITU draws attention to the
17、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 asserted by ITU members or others outside of the
18、 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, implementers are cautioned that this may not represent the latest information an
19、d are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2016 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 68 (12/2015) iii Table of Contents
20、 Page 1 Scope . 1 2 References . 1 3 Definitions 3 3.1 Terms defined elsewhere 3 3.2 Terms defined in this Supplement 4 4 Abbreviations and acronyms 4 5 Evolution of ETS-related activities 6 6 Identification of ETS interoperability limitations . 8 6.1 Analysis of selected use cases 8 6.2 Extended an
21、alysis of ETS requirements and capabilities and detected possible limitations . 15 7 Conclusions. 43 iv Q series Supplement 68 (12/2015) Introduction Supplement 68 to ITU-T Q-series Recommendations is a Technical Report (TR) that describes the study of possible limitations in emergency telecommunica
22、tions service (ETS) interoperability that may prevent ETS users from taking full advantage of new capabilities in modern user terminals (i.e., smartphones), public communication networks and applications (e.g., fourth generation (4G) mobile broadband networks using voice over long term evolution/ric
23、h communication services (VoLTE/RCS) applications). This TR identified and analysed a comprehensive list of telecommunications services and features for ETS interoperability limitations. The identified limitations comprise not only the interfaces between ETS national implementations (ENIs) supportin
24、g the ETSs considered, but also foreseen interoperability problems due to current lack of support for such telecommunication services in ENIs with different technologies. The description of interoperability limitations includes both a technical analysis of standardized interfaces and use cases to il
25、lustrate the involved interactions. Q series Supplement 68 (12/2015) 1 Supplement 68 to ITU-T Q-series Recommendations Technical Report on emergency telecommunications service (ETS) interoperability limitations 1 Scope According to ITU-T Recommendations, an emergency telecommunications service (ETS)
26、 is a national service providing priority telecommunications to the ETS authorized users in times of disaster and emergencies. Concretely, the scope of ETS involves authority-to-authority communications designed to respond to emergency situations through prioritized access to public telecommunicatio
27、ns infrastructures i.e., the public switched telephone network (PSTN) or public land mobile network (PLMN) as described in ITU-T Y.2205. More specifically, Figure 1 of ITU-T Y.2205 constricts the scope of ITU-T activities concerning emergency telecommunications to telecommunications for disaster rel
28、ief (TDR) and interconnection of ETS national implementations (ENIs). Figure 1 ITU-T activities concerning emergency telecommunications (Figure 1 of ITU-T Y.2205) In that sense, fostering the interconnection of different emergency-related authorities that may belong to different countries or interna
29、tional organizations is of utmost relevance in this type of event. One of the challenges is how to address a common interconnection framework taking into account that the ETS national implementations (ENI) are subject to national regulations. This Supplement aims to analyse possible limitations of s
30、uch a standardized framework when applied to complex multimedia services. 2 References ITU-T E.105 Recommendation ITU-T E.105 (1992), International telephone service. ITU-T E.106 Recommendation ITU-T E.106 (2003), International Emergency Preference Scheme (IEPS) for disaster relief operations. 2 Q s
31、eries Supplement 68 (12/2015) ITU-T E.107 Recommendation ITU-T E.107 (2007), Emergency Telecommunications Service (ETS) and interconnection framework for national implementations of ETS. ITU-T H.248.1 Recommendation ITU-T H.248.1 (2013), Gateway control protocol: Version 3 ITU-T H.323 Recommendation
32、 ITU-T H.323 (2009), Packet-based multimedia communications systems. ITU-T J.260 Recommendation ITU-T J.260 (2005), Requirements for preferential telecommunications over IPCablecom networks. ITU-T J.261 Recommendation ITU-T J.261 (2009), Framework for implementing preferential telecommunications in
33、IPCablecom and IPCablecom2 networks. ITU-T M.1400 Recommendation ITU-T M.1400 (1992), Designations for interconnections among operators networks. ITU-T M.3350 Recommendation ITU-T M.3350 (2004), TMN service management requirements for information interchange across the TMN X-interface to support pro
34、visioning of Emergency Telecommunication Service (ETS). ITU-T Q Suppl.47 ITU-T Q-series Recommendations Supplement 47 (2003), Emergency services for IMT 2000 networks Requirements for harmonization and convergence. ITU-T Q Suppl.53 ITU-T Q-series Recommendations Supplement 53 (2005), Signalling requ
35、irements to support the International Emergency Preference Scheme (IEPS). ITU-T Q Suppl.57 ITU-T Q-series Recommendations Supplement 57 (2008), Signalling requirements to support the emergency telecommunications service (ETS) in IP networks. ITU-T Q Suppl.61 ITU-T Q-series Recommendations Supplement
36、 61 (2010), Evaluation of signalling protocols to support ITU-T Y.2171 admission control priority levels. ITU-T Q Suppl.62 ITU-T Q-series Recommendations Supplement 62 (2014), Overview of the work of standards development organizations and other organizations on emergency telecommunications service.
37、 ITU-T Q Suppl.63 ITU-T Q-series Recommendations Supplement 63 (2013), Signalling Protocol Mappings in Support of the Emergency Telecommunications Service in IP Networks. ITU-T X.810 Recommendation ITU-T X.810 (2004), General overview of NGN. ITU-T Y.1271 Recommendation ITU-T Y.1271 (2014), Framewor
38、k(s) on network requirements and capabilities to support emergency telecommunications over evolving circuit-switched and packet-switched networks. ITU-T Y.2001 Recommendation ITU-T Y.2001 (2004), General overview of NGN. ITU-T Y.2011 Recommendation ITU-T Y.2011 (2004), General principles and general
39、 reference model for Next Generation Networks. ITU-T Y.2012 Recommendation ITU-T Y.2012 (1992), International telephone service. Q series Supplement 68 (12/2015) 3 ITU-T Y.2111 Recommendation ITU-T Y.2111 (2011), Resource and admission control functions in next generation networks. ITU-T Y.2205 Reco
40、mmendation ITU-T Y.2205 (2011), Next Generation Networks Emergency telecommunications - Technical considerations. ITU-T Y.2211 Recommendation ITU-T Y.2211 (2007), IMS-based real-time conversational multimedia services over NGN. ITU-T Y.2254 Recommendation ITU-T Y.2254 (2014), Capabilities of multi-c
41、onnection to support enhanced multimedia telephony services. ITU-T Y.2701 Recommendation ITU-T Y.2701 (2007), Security requirements for NGN release 1. ITU-T Y.2702 Recommendation ITU-T Y.2702 (2008), Authentication and authorization requirements for NGN release 1. ITU-T Y.2705 Recommendation ITU-T Y
42、.2705 (2013), Minimum security requirements for the interconnection of the Emergency Telecommunications Service (ETS). ITU-T Y.3501 Recommendation ITU-T Y.3501 (2013), Cloud computing framework and high-level requirements. ITU-T Y.3510 Recommendation ITU-T Y.3510 (2016), Cloud computing infrastructu
43、re requirements. ITU-T Y.3520 Recommendation ITU-T Y.3520 (2015), Cloud computing framework for end to end resource management. 3 Definitions 3.1 Terms defined elsewhere This Supplement uses the following terms defined elsewhere: 3.1.1 border element ITU-T Y.2701: Network element providing functions
44、 connecting different security and administrative domains. 3.1.2 emergency telecommunications service (ETS) ITU-T E.107: A national service providing priority telecommunications to the ETS authorized users in times of disaster and emergencies. 3.1.3 ETS user ITU-T E.107: A user authorized to obtain
45、priority telecommunications in national and/or international emergency situations. 3.1.4 international emergency preference service (IEPS) clause 1 of ITU-T E.106: The IEPS enables the use of public telecommunications by national authorities for emergency and disaster relief operations. It allows us
46、ers, authorized by national authorities, to have access to the International Telephone Service, as described in ITU-T E.105, while this service is restricted either due to damage, congestion or faults, or any combination of these. 3.1.5 international emergency situation ITU-T Y.1271: An emergency si
47、tuation, across international boundaries, that affects more than one country. 3.1.6 IMS-based real-time conversational multimedia services ITU-T Y.2211: Multimedia services provided in real time by using an IMS-based service environment. 3.1.7 media ITU-T Y.2012: One or more of audio, video or data.
48、 4 Q series Supplement 68 (12/2015) 3.1.8 media stream ITU-T Y.2012: A media stream can consist of audio, video, or data, or a combination of any of them. Media stream data conveys user or application data (i.e., a payload) but not control data. 3.1.9 mediated services ITU-T Y.2012: Services that ar
49、e based on intermediate service stratum facilities provided by one or more service providers. 3.1.10 MC-eMMTel (eMMTel service over multi-connection) ITU-T Y.2254: A service over multi-connection which provides real-time bidirectional conversational transfer of multiple media types (e.g., audio, video, data) between two or more terminals simultaneously. 3.1.11 network operator ITU-T M.1400: An operator that manages a telecommu
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