1、 International Telecommunication Union ITU-T G.9971TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (07/2010) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Access networks In premises networks Requirements of transport functions in IP home networks Recommendation ITU-T G.9971
2、 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS G.100G.199 GENERAL CHARACTERISTICS COMMON TO ALL ANALOGUE CARRIER-TRANSMISSION SYSTEMS G.200G.299 INDIVIDUAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHON
3、E SYSTEMS ON METALLIC LINES G.300G.399 GENERAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON RADIO-RELAY OR SATELLITE LINKS AND INTERCONNECTION WITH METALLIC LINES G.400G.449 COORDINATION OF RADIOTELEPHONY AND LINE TELEPHONY G.450G.499 TRANSMISSION MEDIA AND OPTICAL SYSTEMS CHARACTER
4、ISTICS G.600G.699 DIGITAL TERMINAL EQUIPMENTS G.700G.799 DIGITAL NETWORKS G.800G.899 DIGITAL SECTIONS AND DIGITAL LINE SYSTEM G.900G.999 MULTIMEDIA QUALITY OF SERVICE AND PERFORMANCE GENERIC AND USER-RELATED ASPECTS G.1000G.1999 TRANSMISSION MEDIA CHARACTERISTICS G.6000G.6999 DATA OVER TRANSPORT GEN
5、ERIC ASPECTS G.7000G.7999 PACKET OVER TRANSPORT ASPECTS G.8000G.8999 ACCESS NETWORKS G.9000G.9999 In premises networks G.9950G.9999For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T G.9971 (07/2010) i Recommendation ITU-T G.9971 Requirements of transport functions in
6、IP home networks Summary Recommendation ITU-T G.9971 specifies the functional requirements of transport functions in an IP home network associated with the wired access network based on the generic architecture described by Recommendation ITU-T G.9970: “Generic home network transport architecture“.
7、This Recommendation first clarifies the position of the home network in end-to-end transport networks as well as the home network functional architecture, and then provides the functional requirements for the transport capabilities of some key components in the home network, such as the access gatew
8、ay (AGW), IP terminal, etc. Moreover, it mentions some other functional requirements, such as QoS control, management and security so that the operators can reliably provide their services all the way to the IP terminal. History Edition Recommendation Approval Study Group 1.0 ITU-T G.9971 2010-07-29
9、 15 Keywords Access gateway, control, Ethernet, home network, IP, management, NT, ONT, ONU, security. ii Rec. ITU-T G.9971 (07/2010) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication tec
10、hnologies (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 worldwide basis. The World Tele
11、communication 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 WTSA Resolution 1. In some a
12、reas 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 administration and a recognized o
13、perating 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 provisions are met. The words “s
14、hall“ 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 RIGHTS ITU draws attention to the possibility that the
15、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 of the Recommendation de
16、velopment 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 may not represent the latest information and are the
17、refore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2011 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 G.9971 (07/2010) iii Table of Contents Page 1 Scope
18、1 2 References. 1 3 Definitions 2 4 Abbreviations and acronyms 2 5 Conventions 3 6 Position of home network in end-to-end networks . 3 7 Typical IP home network configurations . 4 8 IP home network functional architecture 5 9 IP network configuration and IP address assignment . 8 10 QoS control . 11
19、 10.1 Two kinds of QoS guaranteed services 12 10.2 Three device types for QoS control 12 10.3 Home network QoS control for each QoS service . 13 10.4 Parameters for QoS control 14 10.5 Functional components for QoS control . 14 10.6 Typical QoS control functional components of each device for QoS se
20、rvice type 2 and 3 16 10.7 QoS control requirements for QoS service type 2 19 11 Home network management . 20 11.1 Home network management architecture . 20 11.2 Requirements for RM-RA management interface 22 11.3 Requirements for LM-LA management interface 23 12 Security management 24 Appendix I Re
21、lationship among home network standards . 25 Bibliography. 27 Rec. ITU-T G.9971 (07/2010) 1 Recommendation ITU-T G.9971 Requirements of transport functions in IP home networks 1 Scope This Recommendation specifies the functional requirements of transport functions in an IP home network associated wi
22、th the wireline access network based on the generic architecture described by ITU-T G.9970: “Generic home network transport architecture“. As popularity of broadband services such as FTTH, VDSL and DOCSIS 3.0 increases, this Recommendation covers the cases of home networks connecting to wireline acc
23、ess networks such as these. Services on this home network are triple play services, such as voice, video and data transfer services. However, incorporation of fixed mobile convergence (FMC) using in-home base station is for further study. Once a home network is connected to an access network, mechan
24、isms need to exist that allow the network operator to manage fault, performance, transfer capability, addressing and security for the home network. In many cases, these will be the same as those used to manage the access network. Note that although the NT/ONT, which terminates an access network, is
25、also studied in this Recommendation from the view point of the home network management, it is out of scope that devices are directly connected to NT/ONT without an AGW. Moreover, the scope only includes the case where Ethernet MAC service (which may be over a variety of physical layers) is provided
26、at the WAN side of NT/ONT. While ITU-T G.9960, ITU-T G.9961 and ITU-T G.9972 specify the physical layer, such as transceiver, and the mapping between the physical layer and Layer 2 protocols, this Recommendation studies the subject of IP and Ethernet bridging technologies, which does not overlap wit
27、h the scope of these Recommendations. This Recommendation first clarifies the position of the home network in end-to-end transport networks as well as the home network functional architecture, and then provides the functional requirements for the transport capabilities of some key components in the
28、home network, such as the access gateway (AGW), IP terminal, etc. Moreover, it mentions some other functional requirements, such as QoS control, management and security so that the operators can reliably provide their services all the way to the IP terminal. 2 References The following ITU-T Recommen
29、dations 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. All Recommendations and other references are subject to revision; users of this Recommendation are there
30、fore 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 regularly published. The reference to a document within this Recommendation does not give it, as a stand
31、-alone document, the status of a Recommendation. ITU-T G.9960 Recommendation ITU-T G.9960 (2009), Unified high-speed wire-line based home networking transceivers Foundation. ITU-T G.9961 Recommendation ITU-T G.9961 (2010), Data link layer (DLL) for unified high-speed wire-line based home networking
32、transceivers. ITU-T G.9970 Recommendation ITU-T G.9970 (2009), Generic home network transport architecture. ITU-T G.9972 Recommendation ITU-T G.9972 (2010), Coexistence mechanism for wireline home networking transceivers. 2 Rec. ITU-T G.9971 (07/2010) ITU-T H.622 Recommendation ITU-T H.622 (2008), A
33、 generic home network architecture with support for multimedia services. ITU-T I.371 Recommendation ITU-T I.371 (2004), Traffic control and congestion control in B-ISDN. ITU-T Y.1541 Recommendation ITU-T Y.1541 (2006), Network performance objectives for IP-based services. ITU-T Y.1563 Recommendation
34、 ITU-T Y.1563 (2009), Ethernet frame transfer and availability performance. ITU-T Y.2001 Recommendation ITU-T Y.2001 (2004), General overview of NGN. BBF TR-069 Broadband Forum TR-069 (2007), CPE WAN Management Protocol v1.1, including its Amendment 2. MEF 10.2 Technical Specification MEF 10.2 (2009
35、), Ethernet Service Attributes Phase 2.0. 3 Definitions This Recommendation defines the following terms: 3.1 access gateway (AGW): The AGW associates the access network with the IP home network and handles IP-related protocol packets for these networks. The AGW provides IP and/or Ethernet services t
36、o the home network side. Its definition in this Recommendation is equal to the Internet gateway device (IGD)/residential gateway (RG) in the Broadband Forum or the home gateway in the HGI. Note that it is different from the terminologies used in b-ITU-T Y.2091: its “access gateway“ means edge router
37、, while its “residential gateway“ means terminal adaptor. 3.2 network termination/optical network termination (NT/ONT): The NT/ONT terminates the optical access network and then generally provides the Layer 2 services to the home network side. 4 Abbreviations and acronyms This Recommendation uses th
38、e following abbreviations and acronyms: AGW Access Gateway FMC Fixed Mobile Convergence FTTH Fibre to The Home ICMP Internet Control Message Protocol IP Internet Protocol IPCP Internet Protocol Control Protocol IPV6CP IPv6 Control Protocol LA Local Agent LLDP Link Layer Discovery Protocol LM Local M
39、anager L2F Layer 2 Forwarding L3F Layer 3 Forwarding L1T Layer 1 Termination Rec. ITU-T G.9971 (07/2010) 3 L2T Layer 2 Termination L2TP Layer 2 Tunneling Protocol L3T Layer 3 Termination MAC Media Access Control NAPT Network Address and Port Translation NAT Network Address Translation NAT-PT NAT-Pro
40、tocol Translation NGN Next Generation Networks NSP Network Service Provider NT Network Termination ONT Optical Network Termination PD Prefix Delegation PPP Point-to-Point Protocol QoS Quality of Service RA Remote Agent RM Remote Manager RMS Remote Management Server RSVP Resource Reservation Protocol
41、 SIP Session Initiation Protocol SLAAC StateLess Address AutoConfiguration 5 Conventions local area network (LAN): It represents the home network side of AGW. wide area network (WAN): It represents the access network side of AGW. 6 Position of home network in end-to-end networks This clause describe
42、s a managed home network within the context of end-to-end transport networks as shown in Figure 6-1. The end-to-end network consists of the home network, the AGW, access networks, the core network and some application servers. 4 Rec. ITU-T G.9971 (07/2010) Figure 6-1 Home network to be managed in en
43、d-to-end networks The primary terminal is the end-point where the service from the NSP is terminated, according to ITU-T H.622. That is, the end-to-end services are provided between two primary terminals or between each application server and each primary terminal. The AGW connects the IP home netwo
44、rk with the access network, which is terminated by NT/ONT. Moreover, the primary terminal defined in the application layer normally attaches to the IP home network, in which case the primary terminal is called IP terminal in transport layer, according to ITU-T G.9970. Therefore, the IP terminal, the
45、 IP home network, the AGW, the access networks including NT/ONT, the core network and their relevant control networks could be managed by the NSPs. In order to achieve this, this Recommendation specifies the functions needed in each device within the IP home network, such as the IP terminal, the Eth
46、ernet bridge, the AGW as well as NT/ONT. The requirements in this Recommendation are more detailed than ITU-T G.9970. Note that the case is out of scope where the IP terminal is directly connected to NT/ONT without AGW. Moreover, only the case where Ethernet MAC is used at the WAN side of NT/ONT is
47、included in this Recommendation. 7 Typical IP home network configurations This clause describes configurations of the IP home network to be studied in this Recommendation. Figure 7-1 shows two kinds of IP home network configuration. Configuration 1 shows that one Ethernet bridge either aggregates th
48、e traffic from multiple IP terminals to the AGW or bridges the traffic between two IP terminals. Note that multiple Ethernet bridges can be put in cascade between the IP terminal and the AGW. On the other hand, configuration 2 shows that each IP terminal is directly connected to the AGW. Although th
49、is figure shows the separate type AGW, this Recommendation also studies the aggregate type AGW that combines NT/ONT. Rec. ITU-T G.9971 (07/2010) 5 Figure 7-1 Typical IP home network configurations 8 IP home network functional architecture Key devices can be defined by using the following functional components: Layer 1 termination (L1T): Termination functions of physical layer, such as Ethernet PHY. Layer 2 termination (L2T): Termination functions of Ethernet port, such as MAC address assignment. Layer 2 fo
