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 G.9977 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (02/2016) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Access networks In premises networks Mitigation of interference between DSL and PLC Rec
2、ommendation ITU-T G.9977 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 INTERN
3、ATIONAL CARRIER TELEPHONE 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 O
4、PTICAL SYSTEMS CHARACTERISTICS 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
5、 DATA OVER TRANSPORT GENERIC ASPECTS G.7000G.7999 PACKET OVER TRANSPORT ASPECTS G.8000G.8999 ACCESS NETWORKS G.9000G.9999 Metallic access networks G.9700G.9799 Optical line systems for local and access networks G.9800G.9899 In premises networks G.9900G.9999 For further details, please refer to the l
6、ist of ITU-T Recommendations. Rec. ITU-T G.9977 (02/2016) i Recommendation ITU-T G.9977 Mitigation of interference between DSL and PLC Summary Recommendation ITU-T G.9977 specifies functionality of a mechanism to mitigate interference caused by in-home powerline communication (PLC) devices to an x-t
7、ype digital subscriber line (xDSL) network termination (implementing transceivers in compliance with ITU-T Recommendations such as ITU-T G.993.2 and ITU-T G.9701). This Recommendation addresses various in-home network types and wiring topologies. History Edition Recommendation Approval Study Group U
8、nique ID* 1.0 ITU-T G.9977 2016-02-26 15 11.1002/1000/12548 _ * To access the Recommendation, type the URL http:/handle.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 G.9977 (02/2016
9、) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for st
10、udying 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 years, establishes the topics for study by the ITU-T study gr
11、oups 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 necessary standards are prepared on a collaborative basis with
12、 ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provis
13、ions (to ensure, e.g., interoperability or applicability) and compliance with the Recommendation 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 used to express requirements. The use of su
14、ch words does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTSITU 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 positio
15、n concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had received notice of intellectual property, protected by
16、 patents, which may be required to implement this Recommendation. However, implementers are cautioned that this may 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 2016 All rights reserved. No part of this
17、publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T G.9977 (02/2016) iii Table of Contents Page 1 Scope . 1 2 References . 1 3 Definitions 2 3.1 Terms defined elsewhere 2 3.2 Terms defined in this Recommendation . 2 4 Abbreviations and acro
18、nyms 3 5 Conventions 4 6 Reference models 4 6.1 Generalized reference model 4 6.2 Details of the interfaces 8 7 General approach 8 7.1 Interference mitigation mechanism 8 7.2 Device discovery 12 7.3 Device measurement 16 7.4 Device configuration 17 7.5 Primitives supporting coexistence protocol 19 7
19、.6 Description of primitives 20 Annex A Transmission formats for message exchange 36 A.1 Transmission formats . 36 Bibliography. 39 Rec. ITU-T G.9977 (02/2016) 1 Recommendation ITU-T G.9977 Mitigation of interference between DSL and PLC 1 Scope This Recommendation specifies functionality of a mechan
20、ism to mitigate interference caused by in-home powerline communication (PLC) devices to an x-type digital subscriber line (xDSL) network termination (implementing transceivers in compliance with ITU-T Recommendations such as ITU-T G.993.2 and ITU-T G.9701). This Recommendation addresses various in-h
21、ome network types and wiring topologies. The coordination of both the xDSL access network and in-home PLC network is facilitated by an arbitration function (AF), in order to reduce interference and optimize the performance of both networks and meet the throughput requirements to the end customer acr
22、oss both networks, by appropriately configuring relevant parameters of PLC devices and xDSL network termination (NT) based on a coordination policy that is usually determined and provided by the operator. 2 References The following ITU-T Recommendations and other references contain provisions which,
23、 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 therefore encouraged to investigate the possibility of appl
24、ying 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-alone document, the status of a Recommendation. ITU-T
25、 G.993.2 Recommendation ITU-T G.993.2 (2015), Very high speed digital subscriber line transceivers 2 (VDSL2). ITU-T G.994.1 Recommendation ITU-T G.994.1 (2012), Handshake procedures for digital subscriber line transceivers. ITU-T G.997.1 Recommendation ITU-T G.997.1 (2012), Physical layer management
26、 for digital subscriber line transceivers. ITU-T G.997.2 Recommendation ITU-T G.997.2 (2015), Physical layer management for G.fast transceivers. ITU-T G.998.4 Recommendation ITU-T G.998.4 (2015), Improved impulse noise protection for digital subscriber line (DSL) transceivers. ITU-T G.9701 Recommend
27、ation ITU-T G.9701 (2014), Fast access to subscriber terminals (G.fast) Physical layer specification. ITU-T G.9961 Recommendation ITU-T G.9961 (2015), Unified high-speed wireline-based home networking transceivers Data link layer specification. ITU-T G.9962 Recommendation ITU-T G.9962 (2014), Unifie
28、d high-speed wire-line based home networking transceivers Management specification. ITU-T G.9979 Recommendation ITU-T G.9979 (2014), Implementation of the generic mechanism in the IEEE 1905.1a-2014 Standard to include applicable ITU-T Recommendations. 2 Rec. ITU-T G.9977 (02/2016) IEEE 802.3 IEEE St
29、d 802.3-2008, IEEE Standard for Information technology Telecommunications and information exchange between systems Local and metropolitan area networks-Specific requirements Part 3: Carrier Sense Multiple Access with Collision Detection (CSMA/CD) Access Method and Physical Layer Specifications. IEEE
30、 1905.1 IEEE Std 1905.1-2013, IEEE Standard for a Convergent Digital Home Network for Heterogeneous Technologies. IEEE 1905.1a IEEE Std 1905.1a-2014, IEEE Standard for a Convergent Digital Home Network for Heterogeneous Technologies, Amendment 1, Support of New MAC/PHYs and Enhancements. 3 Definitio
31、ns 3.1 Terms defined elsewhere None. 3.2 Terms defined in this Recommendation This Recommendation defines the following terms: 3.2.1 arbitration function (AF): Entity that facilitates coordination between the xDSL and PLC systems in order to reduce interference on the basis of coordination policy, b
32、y appropriately configuring parameters of the xDSL and PLC devices. The coordination policy is expected to be determined and provided by the operator. In the case where such a policy is not determined or provided by the operator, the AF works according to a predefined default policy. 3.2.2 centraliz
33、ed control mode (CCM): A mode of a PLC network in which devices do not exchange information directly with the AF but via the PLC-NC. 3.2.3 distributed control mode (DCM): A mode of a PLC network in which PLC devices exchange information directly with the AF. 3.2.4 IEEE 1905: Devices implementing the
34、 abstraction layer specified in IEEE 1905.1 and IEEE 1905.1a. In this Recommendation, the term IEEE 1905 is used to refer to the technology, the term IEEE 1905.1 is used to refer to the base standard IEEE 1905.1 and the term IEEE 1905.1a is used to refer to the Amendment IEEE 1905.1a. 3.2.5 power li
35、ne communication (PLC) devices: Components of a PLC network that are intended to be connected to each other via power line and that communicate with each other using appropriate coding and modulation methods. 3.2.6 PLC network: A set of interconnected PLC devices that communicate with each other. Th
36、e in-home PLC network uses in-home power line wiring as the transmission medium. 3.2.7 PLC network controller (PLC-NC): In CCM, one of the PLC devices in the PLC network that is assigned to control all other devices in the network. 3.2.8 xDSL access network: A network that comprises customer premise
37、s equipment and the exchange (or cabinet or DP) equipment implementing xDSL functionality that is compliant with at least one of the ITU-T Recommendations of the ITU-T G.99x or ITU-T G.970x-series. 3.2.9 xDSL network termination (NT): A customer premises equipment implementing xDSL transceiver and a
38、ssociated functionality that is compliant with at least one of the ITU-T Recommendations of the ITU-T G.99x or ITU-T G.970x-series. Rec. ITU-T G.9977 (02/2016) 3 4 Abbreviations and acronyms This Recommendation uses the following abbreviations and acronyms: ACS Auto-Configuration Server AF Arbitrati
39、on Function AL Abstraction Layer CCM Centralized Control Mode CMDU Control Message Data Unit CO Central Office CO-MIB Central Office-Management Information Base CPE Customer Premises Equipment CWMP CPE WAN Management Protocol DCM Distributed Control Mode DLL Data Link Layer DP Distribution Point DPU
40、-MIB Distribution Point Unit Management Information Base DPM xDSL and PLC interference Mitigation DPU Distribution Point Unit EMS Element Management System LAN Local Area Network MAC Media Access Control ME Management Entity NMS Network Management System NT Network Termination OLR On-line Reconfigur
41、ation PHY Physical Layer PLC Powerline Communication PLC-NC PLC Network Controller PSD Power Spectral Density QLN Quiet Line Noise QoS Quality of Service RGW Residential Gateway SAVN Showtime-Adaptive Virtual Noise SNR Signal-to-Noise Ratio SNRM Signal-to-Noise Ratio Margin TLV Type, Length and Valu
42、e WAN Wide Area Network xDSL x-type Digital Subscriber Line 4 Rec. ITU-T G.9977 (02/2016) 5 Conventions None. 6 Reference models 6.1 Generalized reference model The generalized reference model addressing the interference mitigation mechanism is presented in Figure 6-1. The arbitration function (AF)
43、facilitates resource allocation between the powerline communication (PLC) network and the xDSL NT. The communication between the PLC and the AF and between the xDSL NT and the AF are defined over logical interfaces P and C, respectively, while the operator may control the AF via the logical interfac
44、e A. The operators control on AF, as well as other elements of the customer premises network, is usually implemented via the network management system (NMS). In the case where operator control of the AF is not established for any reason, the AF may use its internal arbitration and coexistence polici
45、es to facilitate xDSL-PLC coordination (e.g., the default policies or those downloaded during previous session). This includes the following cases: xDSL line is inactive and thus no connection to the NMS is available; xDSL line is active, but no connection to the NMS is established or NMS is unavail
46、able. In these cases the AF should be able to function without operator control. NOTE To support the coexistence mechanism during the time when operator control is not available, the AF may (either partially or entirely) reside inside the residential gateway (RGW). Figure 6-1 Generalized reference m
47、odel An application of the generalized reference model showing more details of the xDSL and the PLC network is presented in Figure 6-2. Rec. ITU-T G.9977 (02/2016) 5 Figure 6-2 An application of the generalized reference model The first example of a system functional model corresponding to the refer
48、ence models in Figure 6-1 and Figure 6-2 is presented in Figure 6-3. It represents the case in which the AF resides entirely in the RGW. To address a generic case of user installation, both the PLC network and the xDSL NT are connected to the RGW using 802.3 local area network (LAN) interfaces (RGW
49、is a stand-alone device that incorporates AF). Figure 6-3 An example of a system functional model for the case when the xDSL access network and PLC network are associated with the same operator network (AF resides inside the RGW) A second example of a system functional model corresponding to the reference models in Figure 6-1 and Figure 6-2 is presented in Figure 6-4. It represents the case in which the AF resides entirely in the RGW and a PLC
