ITU-T Q 3714-2018 Signalling requirements of SDN-based access networks with media-independent management capabilities (Study Group 11).pdf

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 Q.3714 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (01/2018) SERIES Q: SWITCHING AND SIGNALLING, AND ASSOCIATED MEASUREMENTS AND TESTS Signalling requirements and protocols for SDN Resource control protocols Signalling

2、requirements of SDN-based access networks with media-independent management capabilities Recommendation ITU-T Q.3714 ITU-T Q-SERIES RECOMMENDATIONS SWITCHING AND SIGNALLING, AND ASSOCIATED MEASUREMENTS AND TESTS SIGNALLING IN THE INTERNATIONAL MANUAL SERVICE Q.1Q.3 INTERNATIONAL AUTOMATIC AND SEMI-A

3、UTOMATIC WORKING Q.4Q.59 FUNCTIONS AND INFORMATION FLOWS FOR SERVICES IN THE ISDN Q.60Q.99 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 SPECIFI

4、CATIONS OF SIGNALLING SYSTEM No. 7 Q.700Q.799 Q3 INTERFACE Q.800Q.849 DIGITAL SUBSCRIBER SIGNALLING 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-2

5、000 Q.1700Q.1799 SPECIFICATIONS OF SIGNALLING RELATED TO BEARER INDEPENDENT CALL CONTROL (BICC) Q.1900Q.1999 BROADBAND ISDN Q.2000Q.2999 SIGNALLING REQUIREMENTS AND PROTOCOLS FOR THE NGN Q.3000Q.3709 SIGNALLING REQUIREMENTS AND PROTOCOLS FOR SDN Q.3710Q.3899 Resource control protocols Q.3710Q.3739 N

6、etwork signalling and signalling requirements for services Q.3740Q.3779 TESTING SPECIFICATIONS Q.3900Q.4099 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T Q.3714 (01/2018) i Recommendation ITU-T Q.3714 Signalling requirements of SDN-based access networks with medi

7、a-independent management capabilities Summary Recommendation ITU-T Q.3714 provides signalling architecture, signalling requirements and signalling protocol procedures for SDN-based access networks with media independent management (MIM) capabilities. It defines signalling architecture models of SDN-

8、based access networks with MIM capabilities. The signalling architecture models are described for loosely and tightly coupled integrations between SDN and MIM control frameworks. Signalling requirements and protocol procedures for resource management and seamless handover are described for each sign

9、alling architecture model. History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T Q.3714 2018-01-13 11 11.1002/1000/13483 Keywords Media independent management, MIM, SDN, software-defined networking. * To access the Recommendation, type the URL http:/handle.itu.int/ in the address

10、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 Q.3714 (01/2018) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, informat

11、ion 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 on a worldw

12、ide 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 down in WTS

13、A 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 telecommunication administ

14、ration 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 of these mandatory provisi

15、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 Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTSITU draws attention to t

16、he 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 members or others outside

17、of the Recommendation development process. As of the date of approval of this Recommendation, ITU had received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementers are cautioned that this may not represent the latest inf

18、ormation and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2018 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 Q.3714 (01/2018) iii Table of Co

19、ntents Page 1 Scope . 1 2 References . 1 3 Definitions 1 3.1 Terms defined elsewhere 1 3.2 Terms defined in this Recommendation . 2 4 Abbreviations and acronyms 2 5 Conventions 3 6 Signalling architecture of SDN-based access networks with MIM capabilities . 3 6.1 Loosely-coupled integration of SDN a

20、nd MIM control frameworks . 6 6.2 Tightly-coupled integration of SDN and MIM control frameworks 7 7 Signalling requirements of SDN-based access networks with MIM capabilities . 8 8 High-level signalling protocol procedures of SDN-based access networks with MIM capabilities . 12 Appendix I Related wo

21、rks . 21 Appendix II Use cases. 23 II.1 Use case of seamless vertical handover 23 II.2 Use case of link aggregation . 24 II.3 Use case of coping with interference in wireless network . 24 Bibliography. 26 Rec. ITU-T Q.3714 (01/2018) 1 Recommendation ITU-T Q.3714 Signalling requirements of SDN-based

22、access networks with media-independent management capabilities 1 Scope This Recommendation describes the signalling architecture, signalling requirements and signalling protocol procedures for SDN-based access networks with media independent management (MIM) capabilities. This document introduces si

23、gnalling architecture models of SDN-based access networks with MIM capabilities. The signalling architecture models are described for loosely and tightly coupled integrations between SDN and MIM control frameworks. Signalling requirements and protocol procedures for resource management and seamless

24、handover are described for each signalling architecture model. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid.

25、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 listed below. A list of the currently valid ITU-T Recommendations is

26、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.3300 Recommendation ITU-T Y.3300 (2014), Framework of software-defined networking. 3 Definitions 3.1 Terms defined elsewhere This Recommend

27、ation uses the following terms defined elsewhere: 3.1.1 access network b-ITU-T Q.1742.11: Network that connects access technologies (such as a radio access network) to the core network. 3.1.2 candidate network b-IEEE 802.21: A network that is a potential target to the mobile nodes movement. 3.1.3 mo

28、bile node (MN) b-IEEE 802.21: Communication node that is capable of changing its point of attachment from one link to another. 3.1.4 seamless handover b-IEEE 802.21: A handover associated with a link switch between points of attachment, where the mobile node either experiences no degradation in serv

29、ice quality, security, and capabilities, or experiences some degradation in service parameters that is mutually acceptable to the mobile subscriber and to the network that serves the newly connected interface. 3.1.5 serving network b-IEEE 802.21.1: A network that provides services to the user. The s

30、erving network can be a home subscriber network or a visited network. 3.1.6 software-defined networking ITU-T Y.3300: A set of techniques that enables to directly program, orchestrate, control and manage network resources, which facilitates the design, delivery and operation of network services in a

31、 dynamic and scalable manner. 2 Rec. ITU-T Q.3714 (01/2018) 3.2 Terms defined in this Recommendation This Recommendation defines the following terms: 3.2.1 media independent management (MIM): A management mechanism that allows the control of the link layer and the acquisition of information from the

32、 link layer in a media independent way, by providing a generic interface between the higher layers and the media-specific link layers for different types of media (i.e., wired twisted pair copper, wired optical fibre, wireless radio, etc.). It provides generic link-layer intelligence and other netwo

33、rk resources information independent of the specifics of mobile nodes or radio networks. 3.2.2 media independent management (MIM) function (MIMF): A function that realizes MIM capabilities. 3.2.3 media independent management (MIM) user: An entity that uses the capabilities provided by the MIM functi

34、on. 3.2.4 MIMF-enabled access point: An access point that has an MIM function. NOTE An MIM function can be implemented in WLAN AP or the base station in a cellular network. 4 Abbreviations and acronyms This Recommendation uses the following abbreviations and acronyms: AP Access Point API Application

35、 Program Interface AT Access Technology ID Identifier L1 Layer 1 (physical layer PHY) L2 Layer 2 (medium access control MAC and/or logical link control LLC) LAN Local Area Network LTE Long-Term Evolution MAC Media Access Control MIM Media Independent Management MIMF Media Independent Management Func

36、tion MIS Media Independent Service MISF Media Independent Service Function MN Mobile Node MTCP Multipath TCP NIC Network Interface Card ONF Open Network Foundation PHY Physical Layer PoS Point of Service QoS Quality of Service RAN Radio Access Network REST Representational State Transfer Rec. ITU-T

37、Q.3714 (01/2018) 3 SAP Service Access Point SDMN Software-Defined Mobile Network SDN Software-Defined Networking SDRAN Software-Defined Radio Access Network TCP Transmission Control Protocol VLAN Virtual LAN WiMAX Worldwide Interoperability for Microwave Access WLAN Wireless Local Area Network 5 Con

38、ventions None. 6 Signalling architecture of SDN-based access networks with MIM capabilities Software-defined networking (SDN) is based on the separation of control and data planes with a logically centralized controller. High-level SDN architecture consists of application layer, SDN control layer, r

39、esource layer, and multi-layer management functions. See ITU-T Y.3300. There are two interfaces in the high-level architecture of SDN: the application-control interface called northbound interface and the resource-control interface called southbound interface. In SDN, a logically centralized control

40、ler uses a southbound interface to manage and control the underlying data plane, and configures the forwarding table of the switches. The logical centralized controller also uses a northbound protocol to enable the possibility of creating a centralized view of the network, simplify the control opera

41、tions through service-oriented application program interfaces (APIs) (e.g., northbound interface), and accelerate change and innovation in the control plane. The information about how packets and flows are treated is exchanged among the network entities and stored on the forwarding table. Thus, netw

42、ork operations, such as routing and forwarding decisions, are centralized by the central control entity in the network, which allows more dynamic network topology (re)configuration and flexible operations. The southbound protocol (e.g., OpenFlow protocol) was primarily designed for network control o

43、perations using the southbound interface in wired core network environments. The protocol lacks, however, optimized mechanisms to manage wireless links. In wireless environments, management of the links is more challenging in configuration and resource allocation due to the mobility of users (e.g.,

44、handover) and relatively unstable wireless link conditions (e.g., interference) compared to wired ones. The basic operations of SDN mentioned above mostly target fixed wired links but do not consider wireless link conditions when employing their controlling mechanisms. The dynamic wireless link cond

45、itions are important for the optimized usage of wireless resources. Hence, It is necessary to extend the SDN operations for wireless access networking, by allowing the SDN controller to control and manage wireless links through a set of MIM mechanisms for obtaining wireless link information and cont

46、rolling wireless link behaviour, in an access technology agnostic way. In this way, the SDN will be able to provide a common optimized control for wired and wireless networks. The MIM mechanism consists of the MIM function (MIMF), MIM message and MIM user. The MIM function provides a generic interfa

47、ce between the different link layer technologies and the upper layers. A set of MIM messages, which is common for the different link layer technologies, is used to collect link information and status, and to support seamless handover and resource management functions. An MIM user interacts with the

48、MIM function in the same network entity by sending or receiving MIM messages, and decides whether to use the MIM message information for itself or forward it to another MIM user or MIM function of other network entity. 4 Rec. ITU-T Q.3714 (01/2018) The aim of this Recommendation is to provide signal

49、ling requirements of the SDN-based access networks with MIM capabilities, and to describe SDN control framework models, either interworking with or integrated with the MIM to support signalling scenarios related to radio resource allocation and seamless handover. In the following subclauses, we define and describe network architecture and signalling architecture of the SDN-based access networks with MIM capabilities. Clause 6.1 describes the network architecture of SDN-based access networks with MIM capabilities. Clause 6.2 des