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 Y.4455 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (10/2017) SERIES Y: GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS, NEXT-GENERATION NETWORKS, INTERNET OF THINGS AND SMART CITIES Internet of things and s
2、mart cities and communities Frameworks, architectures and protocols Reference architecture for Internet of things network capability exposure Recommendation ITU-T Y.4455 ITU-T Y-SERIES RECOMMENDATIONS GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS, NEXT-GENERATION NETWORKS, INTERNET OF
3、 THINGS AND SMART CITIES GLOBAL INFORMATION INFRASTRUCTURE General Y.100Y.199 Services, applications and middleware Y.200Y.299 Network aspects Y.300Y.399 Interfaces and protocols Y.400Y.499 Numbering, addressing and naming Y.500Y.599 Operation, administration and maintenance Y.600Y.699 Security Y.70
4、0Y.799 Performances Y.800Y.899 INTERNET PROTOCOL ASPECTS General Y.1000Y.1099 Services and applications Y.1100Y.1199 Architecture, access, network capabilities and resource management Y.1200Y.1299 Transport Y.1300Y.1399 Interworking Y.1400Y.1499 Quality of service and network performance Y.1500Y.159
5、9 Signalling Y.1600Y.1699 Operation, administration and maintenance Y.1700Y.1799 Charging Y.1800Y.1899 IPTV over NGN Y.1900Y.1999 NEXT GENERATION NETWORKS Frameworks and functional architecture models Y.2000Y.2099 Quality of Service and performance Y.2100Y.2199 Service aspects: Service capabilities
6、and service architecture Y.2200Y.2249 Service aspects: Interoperability of services and networks in NGN Y.2250Y.2299 Enhancements to NGN Y.2300Y.2399 Network management Y.2400Y.2499 Network control architectures and protocols Y.2500Y.2599 Packet-based Networks Y.2600Y.2699 Security Y.2700Y.2799 Gene
7、ralized mobility Y.2800Y.2899 Carrier grade open environment Y.2900Y.2999 FUTURE NETWORKS Y.3000Y.3499 CLOUD COMPUTING Y.3500Y.3999 INTERNET OF THINGS AND SMART CITIES AND COMMUNITIES General Y.4000Y.4049 Definitions and terminologies Y.4050Y.4099 Requirements and use cases Y.4100Y.4249 Infrastructu
8、re, connectivity and networks Y.4250Y.4399 Frameworks, architectures and protocols Y.4400Y.4549 Services, applications, computation and data processing Y.4550Y.4699 Management, control and performance Y.4700Y.4799 Identification and security Y.4800Y.4899 Evaluation and assessment Y.4900Y.4999 For fu
9、rther details, please refer to the list of ITU-T Recommendations. Rec. ITU-T Y.4455 (10/2017) i Recommendation ITU-T Y.4455 Reference architecture for Internet of things network capability exposure Summary Recommendation ITU-T Y.4455 introduces Internet of things (IoT) network capability exposure (N
10、CE). The IoT NCE is a functional entity in network domain, and facilitates IoT applications and services to make full use of capabilities of their underlying networks. The IoT NCE can optimize user experience, improve network efficiency and expose network capability in order to optimize IoT applicat
11、ions and services. Recommendation ITU-T Y.4455 clarifies the concept of the IoT NCE, identifies its general characteristics and common requirements, and provides the reference architecture and relevant capabilities for the IoT NCE. Additionally, it provides several use cases and common procedures to
12、 illustrate the concept and the architecture of the IoT NCE. History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T Y.4455 2017-10-29 20 11.1002/1000/13389 Keywords Capability, Internet of things, network capability exposure. * To access the Recommendation, type the URL http:/handl
13、e.itu.int/ in the address field of your web browser, followed by the Recommendations unique ID. For example, http:/handle.itu.int/11.1002/1000/ 11830-en. ii Rec. ITU-T Y.4455 (10/2017) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of t
14、elecommunications, 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 tel
15、ecommunications 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
16、 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 Recommendation, the expression “Administration“ is used for conciseness to indicate both a
17、 telecommunication administration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure, e.g., interoperability or applicability) and compliance with the Recommendation is achieved when all
18、 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 Recommendation is required of any party. INTELLECTUAL PROPERTY RIG
19、HTSITU draws attention to the possibility that the practice or implementation of this Recommendation 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
20、 members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementers are cautioned that this m
21、ay not represent the latest information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2017 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T Y
22、.4455 (10/2017) iii Table of Contents Page 1 Scope . 1 2 References . 1 3 Definitions 1 3.1 Terms defined elsewhere 1 3.2 Terms defined in this Recommendation . 1 4 Abbreviations and acronyms 2 5 Conventions 2 6 Introduction to the Internet of things network capability exposure 2 7 General character
23、istics of the Internet of things network capability exposure . 3 7.1 Supporting multiple networks 4 7.2 Exposing network capabilities 4 7.3 Security . 4 7.4 Compatibility 4 8 Working models of the Internet of things network capability exposure 4 8.1 Single network working model of the Internet of th
24、ings network capability exposure . 5 8.2 Multiple network working model of the Internet of things network capability exposure . 5 9 Common requirements of the IoT NCE 6 9.1 Requirements for publication of exposed network capabilities 6 9.2 Requirements for subscription of the exposed network capabil
25、ities 7 9.3 Requirements for accessing exposed network capabilities 7 9.4 Requirements for reference points 7 9.5 Security requirement 7 9.6 Other requirement . 7 10 Reference architecture of the IoT NCE 7 10.1 Exposure supporting functional component . 9 10.2 Exposure coordination functional compon
26、ent 10 10.3 Network agent management functional component . 10 10.4 Network agent functional component 10 10.5 Reference point NCE-1 11 11 Common capabilities of the IoT NCE 11 11.1 Publishing . 11 11.2 Subscribing . 11 11.3 Accessing 12 11.4 Delivering . 12 12 Security considerations . 12 Appendix
27、I Use cases of the Internet of things network capability exposure . 13 iv Rec. ITU-T Y.4455 (10/2017) Page I.1 Use case for exposing mobility management capabilities 13 Appendix II Common procedures of the Internet of things network capability exposure 15 II.1 Publication of the network capabilities
28、 to be exposed . 15 II.2 Subscription to published network capabilities 15 II.3 Accessing subscribed network capabilities from IoT service 16 II.4 Invoking the subscribed network capabilities to serve IoT devices . 17 Appendix III Interworking with service capability exposure framework within 3GPP s
29、ystems 20 Bibliography. 22 Rec. ITU-T Y.4455 (10/2017) 1 Recommendation ITU-T Y.4455 Reference architecture for Internet of things network capability exposure 1 Scope This Recommendation specifies reference architecture for Internet of things (IoT) network capability exposure (NCE). The scope of thi
30、s Recommendation includes: the concept, general characteristics and requirements of IoT NCE; reference architecture for IoT NCE. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendatio
31、n. At the time of publication, the editions indicated were valid. All Recommendations and other references are subject to revision; users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references lis
32、ted below. A list of the currently valid ITU-T Recommendations is regularly published. The reference to a document within this Recommendation does not give it, as a stand-alone document, the status of a Recommendation. ITU-T Y.4000 Recommendation ITU-T Y.4000/Y.2060 (2012), Overview of the Internet
33、of things. 3 Definitions 3.1 Terms defined elsewhere This Recommendation uses the following terms defined elsewhere: 3.1.1 application b-ITU-T Y.2091: A structured set of capabilities, which provide value-added functionality supported by one or more services, which may be supported by an API interfa
34、ce. 3.1.2 capability b-ITU-R M.1224-1: The ability of an item to meet a service demand of given quantitative characteristics under given internal conditions. 3.1.3 Internet of things (IoT) ITU-T Y.4000: A global infrastructure for the information society, enabling advanced services by interconnectin
35、g (physical and virtual) things based on existing and evolving interoperable information and communication technologies. NOTE 1 Through the exploitation of identification, data capture, processing and communication capabilities, the IoT makes full use of things to offer services to all kinds of appl
36、ications, whilst ensuring that security and privacy requirements are fulfilled. NOTE 2 In a broad perspective, the IoT can be perceived as a vision with technological and societal implications. 3.1.4 service b-ITU-T Y.2091: A set of functions and facilities offered to a user by a provider. 3.1.5 thi
37、ng ITU-T Y.4000: With regard to the Internet of things, this is an object of the physical world (physical things) or of the information world (virtual things), which is capable of being identified and integrated into communication networks. 3.2 Terms defined in this Recommendation None. 2 Rec. ITU-T
38、 Y.4455 (10/2017) 4 Abbreviations and acronyms This Recommendation uses the following abbreviations and acronyms: API Application Programming Interface CCM Car Communication Manager CDMA Code Division Multiple Access EC-FC Exposure Coordination Functional Component ES-FC Exposure Supporting Function
39、al Component GSM Global System for Mobile communications ICT Information and Communication Technology IoT Internet of things LTE Long Term Evolution NA-FC Network Agent Functional Component NAM-FC Network Agent Management Functional Component NB-IoT Narrowband IoT NCE Network Capability Exposure QoS
40、 Quality of Service REST Representational State Transfer SCEF Service Capability Exposure Framework SDO Standards Development Organization SSAS Service Support and Application Support TLS Transport Layer Security WCDMA Wideband Code Division Multiple Access WiMAX Worldwide interoperability for Micro
41、wave Access 5 Conventions The following conventions are used in this Recommendation: The keywords “is required to“ indicate a requirement which must be strictly followed and from which no deviation is permitted, if conformance to this Recommendation is to be claimed. The keywords “is recommended“ in
42、dicate a requirement which is recommended but which is not absolutely required. Thus, this requirement need not be present to claim conformance. 6 Introduction to the Internet of things network capability exposure IoT NCE is a flexible approach developed for IoT network providers, which uses open or
43、 proprietary network application programming interfaces (APIs), such as RESTful APIs, to expose the capabilities of IoT networks. Currently, from the perspective of network providers, due to a lack of uniform standards, various proprietary platforms have to be deployed and maintained in order to exp
44、ose their various network capabilities (such as IoT device management or dynamic communication management). From the perspective of developers who integrate those network capabilities, they have to pay more costs to Rec. ITU-T Y.4455 (10/2017) 3 develop and maintain their applications and services i
45、n order to integrate the various platforms and their related APIs. The IoT NCE is a functional entity (see Figure 6-1) that facilitates IoT applications, services and IoT devices to make full use of capabilities of their underlying networks. Those networks with different information communication te
46、chnologies (e.g., 3GPP-based networks, 3GPP2-based networks and WiMAX-based networks) publish open or proprietary APIs for their network capabilities on the IoT NCE. IoT NCE publishes network capabilities according to access policies and network requests. IoT applications and services can subscribe
47、and access the exposed network capabilities using the reference points provided by the IoT NCE. Through the IoT NCE, IoT applications and services, and relevant IoT devices can interact with underlying networks to access the network capabilities exposed by the underlying networks. Figure 6-1 Overvie
48、w of the Internet of things network capability exposure NOTE 1 3GPP-based network refers to a network mainly based on the communication standards specified by the Third Generation Partnership Project, e.g., global system for mobile communications (GSM), wideband code division multiple access (WCDMA)
49、, long term evolution (LTE) and narrowband IoT (NB-IoT). NOTE 2 3GPP2-based network refers to a network mainly based on the communication standards specified by the Third Generation Partnership Project 2 (3GPP2), e.g., code division multiple access (CDMA) one and CDMA 2000. NOTE 3 WiMAX-based network refers to a network mainly based on the series of communication standards, e.g., b-IEEE 802.16, specified by the worldwide interoperability for microwave access (WiMAX) forum. 7 Gener
