1、 ETSI TS 103 430 V1.1.1 (2016-05) PowerLine Telecommunications (PLT); Specification on coexistence of VDSL2 and PLT modems in customer premises; Spectral management of PLT and VDSL2 transceivers TECHNICAL SPECIFICATION ETSI ETSI TS 103 430 V1.1.1 (2016-05)2 Reference DTS/PLT-00042 Keywords powerline
2、, VDSL2 ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N 348 623 562 00017 - NAF 742 C Association but non lucratif enregistre la Sous-Prfecture de Grasse (06) N 7803/88 Important notice The present document can be downloaded
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7、n authorization of ETSI. The copyright and the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2016. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members. 3GPPTM
8、and LTE are Trade Marks of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. GSM and the GSM logo are Trade Marks registered and owned by the GSM Association. ETSI ETSI TS 103 430 V1.1.1 (2016-05)3 Contents Intellectual Property Rights 4g3Foreword . 4g3Executive
9、 summary 4g3Modal verbs terminology 4g3Introduction 4g31 Scope 6g32 References 6g32.1 Normative references . 6g32.2 Informative references 6g33 Definitions and abbreviations . 7g33.1 Definitions 7g33.2 Abbreviations . 7g34 Configuration of VDSL2 gateway and PLT network in customer premise . 7g34.1 I
10、ntroduction 7g34.2 DSL and PLT Channel Coupling Model 8g34.3 Analysis of the PHY layers of PLT and DSL . 9g35 Reference models . 10g35.1 Generalized reference model 10g35.2 Details of the interfaces 11g36 General approach 11g36.1 Overview of PLC the interference mitigation mechanism . 11g36.1.1 Over
11、view 11g36.2 Device discovery 12g36.2.1 Overview 12g36.3 Device measurement 13g36.3.1 Overview 13g36.4 Device configuration 13g36.4.1 Overview 13g36.5 Primitives supporting coexistence protocol 13g36.6 Description of primitives 13g3History 15g3ETSI ETSI TS 103 430 V1.1.1 (2016-05)4 Intellectual Prop
12、erty Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found in ETSI SR 000 314: “Intellectual Property Rights (IPRs); E
13、ssential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (https:/ipr.etsi.org/). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carri
14、ed out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. Foreword This Technical Specification (TS) has been produced by ETSI Technical
15、 Committee Powerline Telecommunications (PLT). The present document is a deliverable covering the coexistence of Powerline Telecommunication transceivers with Very high speed Digital Subscriber Line transceivers in customer premises. The present document on coexistence of VDSL2 and PLT is aligned on
16、 Recommendation ITU-T G.9979 Amendement 1 i.5. Executive summary The overlapping of frequency bands between DSL and PLT is causing mutual interferences raising the issue of EMC. The present document specifies reference models and functionality of a mechanism to mitigate interference caused by in-hom
17、e powerline devices to xDSL (implementing access Recommendations like Recommendation ITU-T G.993.2 2 and Recommendation ITU-T G.9701 i.4) and vice versa. It is defined as a pointer document to the Recommendation ITU-T G.9977 (2016) 1. Addressing the coexistence problems of PLT and DSL operating in c
18、ustomer environments, the present document describes a coordination of both the xDSL access and in-home powerline transmission by an arbitration function (AF) which allows optimizing the performance of each part of the system in order to meet the throughput requirements to the end customer across bo
19、th in-home and xDSL access networks by appropriately configuring parameters of xDSL and/or PLC devices based on a coordination policy whenever this policy is available. Modal verbs terminology In the present document “shall“, “shall not“, “should“, “should not“, “may“, “need not“, “will“, “will not“
20、, “can“ and “cannot“ are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of provisions). “must“ and “must not“ are NOT allowed in ETSI deliverables except when used in direct citation. Introduction Over the past decades, broadband technologies
21、 for access networks and home networking have seen an increasing level of improvements to meet consumers expectations in speed and services. The demand for higher bit rate data services from customer side is promoted by high-speed Internet access and many forthcoming innovative services as UHD video
22、 streaming. This demand become possible with the deployment of DSL technology as well as the extension to DSL vectoring and bonding. Recent advances in power line communications (PLT) have made it popular for in-home networking. This makes PLT a source of interference for digital subscriber line (DS
23、L) networks within the home environment. ETSI ETSI TS 103 430 V1.1.1 (2016-05)5 The present document proposes interference mitigation solutions that allow the coexistence of in-home PLT and DSL networks. In addition, the present document proposes two interference mitigation solutions that enhance th
24、e coexistence of in-home PLT and DSL networks. The interactions between a Digital Subscriber Line (DSL) access network and Home Networks based on Powerline Telecommunication (PLT) have been reported during past years as PLT modems are widely used for IPTV distribution in a home. PLT networks and DSL
25、 networks use some of the same frequencies in the unlicensed band from 2 - 88 MHz. PLT devices and DSL devices may often be placed in relative proximity to each other and there are concerns that this could present interference. ETSI ETSI TS 103 430 V1.1.1 (2016-05)6 1 Scope The present document defi
26、nes a method to improve the coexistence by mitigating the interference between the DSL transceiver and PLT transceiver operating in overlapping frequency band but on different cables. In-home PLT networks operate over the same spectrum as DSL networks. This increases the likelihood of crosstalk betw
27、een PLT and DSL communications systems. For instance, two home networks that operate at the same frequency range, one over copper twisted-pairs (138 kHz - 30 MHz) and the other over power lines (1,8 MHz - 30 MHz ), would interfere with each other.(ETSI TR 102 930 i.1). The DSL and PLT interference e
28、nvironment is discussed in more detail. Communication standards for PLT, have been developed with mechanisms that prevent any interference between various systems within the home environment. 2 References 2.1 Normative references References are either specific (identified by date of publication and/
29、or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the referenced document (including any amendments) applies. Referenced documents which are not found to be publicly available in the expec
30、ted location might be found at https:/docbox.etsi.org/Reference/. NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee their long term validity. The following referenced documents are necessary for the application of the present document. 1
31、Recommendation ITU-T G.9977 (02-2016): “Mitigation of Interference between DSL and PLC“. 2 Recommendation ITU-T G.993.2 (01-2015): “Very high speed digital subscriber line transceivers 2 (VDSL2)“. 2.2 Informative references References are either specific (identified by date of publication and/or edi
32、tion number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the referenced document (including any amendments) applies. NOTE: While any hyperlinks included in this clause were valid at the time of publica
33、tion, ETSI cannot guarantee their long term validity. The following referenced documents are not necessary for the application of the present document but they assist the user with regard to a particular subject area. i.1 ETSI TR 102 930 (V1.1.1): “PowerLine Telecommunications (PLT); Study on signal
34、 processing improving the coexistence of VDSL2 and PLT“. i.2 ETSI-PLUGTEST (May 25-29, 2009): “DSL and in-door PLT coexistence Tests Report“ from LANPARK. i.3 BroadBand ForumTR-069: “CPE WAN Management Protocol“. NOTE: Available at http:/www.broadband-forum.org/cwmp.php. i.4 Recommendation ITU-T G.9
35、701: “Fast access to subscriber terminals (G.fast) - Physical layer specification“. i.5 Recommendation ITU-T G.9979 (2014) Amendment 1 (02-2016): “Implementation of the generic mechanism in the IEEE 1905.1a - 2014 Standard to include applicable ITU-T Recommendations“. ETSI ETSI TS 103 430 V1.1.1 (20
36、16-05)7 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the following terms and definitions apply: Arbitration Function (AF): entity that facilitates coordination between the DSL and PLC systems in order to reduce interference on the basis of coordination po
37、licy by appropriately configuring parameters of the DSL and PLC devices NOTE: The coordination policy is expected to be determined and provided by the operator. In case such policy is not determined or provided by the operator, the AF works according to a predefined default policy. Customer Premises
38、 Equipment (CPE): customer premises equipment implementing xDSL functionality that is compliant with at least one of the Recommendation ITU-Ts of G.99x and G.970x series Centralized Control Mode (CCM): mode of a PLC network in which devices do not exchange information directly with the AF but via th
39、e PLC-NC Distributed Control Mode (DCM): mode of a PLC network in which PLC devices exchange information directly with the Arbitration Function 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 Abbrevia
40、tions For the purposes of the present document, the following abbreviations apply: AF Arbitraty Function CPE Customer Premises Equipment DMT Discrete MultiTone DSL Digital Subscriber Line DSM Dynamic Spectrum Management EMC ElectroMagnetic CompatibilityFDD Frequency Division Duplexing IPTV Internet
41、Protocol TeleVision ITU-T International Telecommunication Union - Telecommunication LAN Local Area Network MAC Medium Access Controler (Layer 2) MIMO Multiple Input Multiple Output NMS Network Management SystemNT NeTwork OFDM Orthogonal Frequency Division Multiplexing (multi-carrier transmission) OP
42、CODE OPeration CODE PHY PHYsical layer /transmission (Layer 1) PLC PowerLine Communication PLT PowerLine Telecommunication RGW Residential GateWay TV TeleVision UHD Ultra High Definition (4K video) VDSL2 Second generation of Very high speed Digital Subscriber Line 4 Configuration of VDSL2 gateway an
43、d PLT network in customer premise 4.1 Introduction DSL and PLT technologies are based on OFDM transmission and both PLT and DSL modems operate in the frequency range from 2 MHz to 30 MHz, although on different cables. ETSI ETSI TS 103 430 V1.1.1 (2016-05)8 Figure 1: Interaction between DSL and PLT T
44、he cross-channel coupling depends on the type of cables (twisted or untwisted) used for DSL transmission as well as on the following parameters (length, space/distance, type): Length of co-localized cables: 1 m, 5 m, 20 m. Space between cables: Contact, 1 cm, 6 cm, 20 cm. DSL cables: untwisted, CAT3
45、, CAT5. Power cables: 3G2.5. The cross-channel coupling occurs when cables are co-localized (telephone and electrical), this configuration includes customer premise equipments as residential broadband gateway, set-top-box and connected TV. Under real life tests i.2 with several PLT technologies allo
46、wed the following conclusions: the confirmation of DSL and PLT signals in-door coupling, depending on the quality (twisted or not twisted) of cables, the distance between the telephone and electrical cables. 4.2 DSL and PLT Channel Coupling Model The DSL and PLT channels are usually modelled separat
47、ely, for our purpose of coexistence of these two transceivers, a MIMO channel model of dimension using matrix H (2 x 2) was introduced to take into account the channel coupling and this is illustrated in figure 2). In this MIMO model, coefficient h1,1 represents the DSL channel model, and coefficien
48、t h2,2 the PLT channel model. This MIMO model exhibit also channel coupling coefficients as coefficient h2,1 from PLT to DSL and coefficient h1,2 vice-versa (i.e. from DSL to PLT). The complete model also include additive noises (n1,n2) on each channel as depicted in figure 2. In figure 2, the input
49、 signals are: X1 for DSL and X2 for PLT and output signals (the ones actually received by the modems) are Y1 for DSL modem and Y2 for PLT modem. ETSI ETSI TS 103 430 V1.1.1 (2016-05)9 Figure 2: DSL and PLT channel coupling MIMO model The coexistence between these two transceivers could be solved at different layers levels: Both PLT and VDSL2 modems operate in the frequency range from 2 MHz to 30 MHz, although on different cables. The coupling factor is increasing as a function of frequency; this observation is correlated to the coupling fact
