1、 ETSI TS 103 323 V1.1.1 (2015-03) PowerLine Telecommunications (PLT); Spectral Management of neighbouring PLT networks based on Dynamic Spectral Management (DSM) TECHNICAL SPECIFICATION ETSI ETSI TS 103 323 V1.1.1 (2015-03)2 Reference DTS/PLT-00045 Keywords network, powerline ETSI 650 Route des Luci
2、oles 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 from: http:/www.etsi.org/standa
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7、d the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2015. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members. 3GPPTM and LTE are Trade Marks of ETSI registere
8、d 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 103 323 V1.1.1 (2015-03)3 Contents Intellectual Property Rights 4g3Foreword . 4g3Executive summary 4g3Modal verbs terminology 4g3In
9、troduction 4g31 Scope 6g32 References 6g32.1 Normative references . 6g32.2 Informative references 6g33 Abbreviations . 6g34 Configuration of the PLT network in customer premises 7g35 Solution based on iterative bit-loading . 8g36 Recommendation based on DSM for NN PLT coexistence in a MDU 13g3Histor
10、y 14g3ETSI ETSI TS 103 323 V1.1.1 (2015-03)4 Intellectual Property 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 fou
11、nd in ETSI SR 000 314: “Intellectual Property Rights (IPRs); Essential, 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 (http:/ipr.etsi.org). Pursuant to the ETSI IPR Poli
12、cy, no investigation, including IPR searches, has been carried 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 Tech
13、nical Specification (TS) has been produced by ETSI Technical Committee Powerline Telecommunications (PLT). Executive summary Addressing the coexistence problems of PLT neighbourhood networks operating in customer environments, the present document describes spectral management for OFDM based transce
14、ivers for minimizing the impact like the drop of bitrate. The solution is based on spectral management reducing the power level of interfering PLT carriers on PLT neighbourhood carriers and spreading data on remaining PLT carriers. The Dynamic Spectral Management (DSM) processing implemented in PLT
15、modems is suitable for second generation PLT modems operating up to 80 MHz. The present document propose a new approach for solving the interference caused by neighbouring networks, when at least two customers are using PLT modems on powerline. It is proposed to adopt this approach, so that PLT home
16、 networking transceivers are equipped with Dynamic Spectral Management (DSM) in the domain master. Modal verbs terminology In the present document “shall“, “shall not“, “should“, “should not“, “may“, “need not“, “will“, “will not“, “can“ and “cannot“ are to be interpreted as described in clause 3.2
17、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 The majority of the population in the world live in multi-dwelling unit (MDU) buildings. The need for sharing high-
18、speed networking within these often closely spaced units has resulted in an increase in the use of High Frequency (HF) generated by powerline telecommunications (PLT). The PLT networks within a given MDU will be in close proximity to each other, and connect to the same wiring, so the signals will be
19、 detectable on adjacent networks. This may appear as a source of interference, which can limit the PLT throughputs. This is a common problem of all networking technology whose signals are not physically constrained. Neighbouring Networks (NN) interference occurs when signals transmitted over one hom
20、e network propagate to neighbouring networks. For PLT, signals can transfer to other PLT networks through inductive propagation or due to low attenuation when the networks share common feeder lines as the number of PLT deployed systems increases. The present document describes a technique based on D
21、SM to address this problem. ETSI ETSI TS 103 323 V1.1.1 (2015-03)5 Dynamic Spectrum management (DSM) has been recognized as a key technology for tackling multi-user crosstalk interference for DSL broadband access. The present document proposes a method based on dynamic spectral management multi-user
22、 signals from several PLT modems operating in neighbouring networks. Inside this network the domain master modem have the capacity to handle complex DSM operations. The solution, described in the present document, is based on minimization of the interference by coordination at Physical layer level u
23、sing dynamic spectral management approach. Solving this interference at signal level is important for the next generation of PLT modems and in large scale deployments of next generation home networks with peaceable relationship with users in a vicinity. DSM methods can avoid unnecessary impoliteness
24、 between neighbours using PLT modems if their Domain Master modems integrate efficient carrier management using DSM. PLT networks communicate using high frequency signals transmitted over a residences mains power wiring. The signal power is generally sufficient to allow communication between all the
25、 in-home power sockets; however, this means the signals can also propagate beyond the intended residence. Many PLT technologies transmit at the highest signal strength allowed, to overcome noise and ensure they can pass data at the maximum rate within their own network; however, this increases the p
26、roblem for their neighbours. The number of neighbouring networks affected depends on the PLT signal strength, topology of the MDU wiring, and the impedance between networks. It is quite common for PLT networks more than one floor away to detect signals from another PLT network. This interference occ
27、urs when a line in the electrical network is situated close to a line in this other network. This is because, as these high-rate technologies use at least partially the same reserved frequency band, and the same data coding method by distribution over carrier frequencies, in this case OFDM, when a l
28、ine in the electrical network is situated in the vicinity of a line in this other network, the transmission performance of the transmission channel of each of the two networks degrades, causing in particular losses of transmission rate on these two networks. This interference is amplified when the m
29、odems in the two local networks are supplied by the same electrical source since, in this case, coupling by conduction between the modems occurs. The use of the electrical network and another network for distributing the services of a triple-play offer therefore poses the problem of interference bet
30、ween a powerline signal that is transmitted between modems on an electrical network and a signal that is transmitted on another network, which may be an electrical network possibly distinct from the first. More precisely, this iterative method consists, at each iteration, of optimizing the transmiss
31、ion rate of the transmission channel on the line and the transmission power level of the signal transmitted on this channel, considering the interference on the other lines in this network as noise and subject to a given spectral density profile. ETSI ETSI TS 103 323 V1.1.1 (2015-03)6 1 Scope The pr
32、esent document defines requirements on coexistence between two PLT transceivers operating in the same frequency band and on same electrical cables on different neighbouring networks. The present document includes a solution based on signal processing algorithms for minimizing of the interferences ca
33、used by one PLT on other PLT network based on spectral management It is assumed the PLT network is based on a master and slaves modems. 2 References 2.1 Normative references References are either specific (identified by date of publication and/or edition number or version number) or non-specific. Fo
34、r specific references, only the cited version applies. For non-specific references, the latest version of the reference document (including any amendments) applies. Referenced documents which are not found to be publicly available in the expected location might be found at http:/docbox.etsi.org/Refe
35、rence. 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. Not applicable. 2.2 Informative references References are eit
36、her specific (identified by date of publication and/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 reference document (including any amendments) applies. NOTE: While any hyperlinks
37、included in this clause were valid at the time of publication, 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 W. Yu et al: “An Adap
38、tive Multiuser Power Control Algorithm for VDSL“, GLOBECOM01, vol. 1, 2001. i.2 ETSI TR 102 269: “PowerLine Telecommunications (PLT); Hidden Node review and statistical analysis“. 3 Abbreviations For the purposes of the present document, the following abbreviations apply: BF Frequency Band DM1 Domai
39、n Master for user 1 DM2 Domain Master for user 2 DSL Digital Subscriber Line DSM Dynamic Spectrum Management HF High Frequency MAC Medium Access Controller (Layer 2) MCPL PLT Modem Courant porteur en Ligne MDU Multi-Dwelling Unit MIMO Multiple Input Multiple Output ETSI ETSI TS 103 323 V1.1.1 (2015-
40、03)7 NN Neighbouring Networks (PLT) OFDM Orthogonal Frequency Division Multiplexing (Multi-carrier transmission) PHY Physical Layer /transmission (Layer 1) PLT PowerLine Telecommunication PSD Power spectral density R1Electrical Network 1 R2Electrical Network 2 S1PLT signal for user 1 S2PLT signal fo
41、r user 2 SNR(F) Signal to Noise Ratio at frequency F VDSL Very high speed Digital Subscriber Line (15 MHz) VDSL2 Second generation of VDSL (30 MHz) 4 Configuration of the PLT network in customer premises It is assumed that the Service Provider has installed a network using the same PLT technology in
42、 each user unit. These networks will interfere with one another to an extent dependent on their relative physical location, potential for signal propagation between networks, and the electrical path the signals can take between networks. The configuration of the PLT networks in close proximity to ap
43、artments, which may or may not be the case, depending on MDU wiring rules for each country. The PLT signals can cross over between networks over the in-building wiring. Typically, there is 20 to 40 dB attenuation between networks due to the circuit breakers, meters, cable distances and topology; how
44、ever, this value will vary between individual PLT nodes and between PLT networks. According to ETSI TR 102 269 i.2, the median attenuation 15 MHz between sockets in the same flat is 40 dB, while median attenuation 15 MHz between in different flats is 60 dB. Roughly, this would add 20 dB for median i
45、nter unit attenuation. Each network in the MDU building experiences its own set of interference, distinct from that of other networks. Therefore, each network has its own NN PLT networks mitigation needs. The interference a PLT network experiences is known as the networks interference pattern. Furth
46、er, each node in each network has its own node interference pattern. NN interference can be time varying with respect to amplitude or even presence. These nodes not only experience NN interference when they are powered up, they also change the interference pattern for all networks and nodes that det
47、ect their signals. This interference occurs when a line in the electrical network is situated close to a line in this other network. This is because, as these high-rate technologies use at least partially the same reserved frequency band, and the same data coding method by distribution over carrier
48、frequencies. However, as the number of PLT networks deployed in the building increases, neighbouring network interference increases and service deteriorates, with resultant service calls. The local networks nodes detect the NN signals as noise, thus raising the noise floor and reducing the signal to
49、 noise ratio (SNR) of the local nodes, effecting their throughput and ability to overcome other noise they encounter. Figure 1: Illustration of two electrical networks R1 and R2 interfering in a MDU ETSI ETSI TS 103 323 V1.1.1 (2015-03)8 As stated previously, PLT networks interference is deemed to be high when another PLT signal is strong enough to be detected by a local network node as a valid PLT signal and that this signals power level is enough to overcome local PLT signals. When signals are at this level, the interfered networks ability to pass data deteri
