WO2017060932A1 - Procédé et système de multiplexage d'accès sur des réseaux comprenant des paires métalliques - Google Patents

Procédé et système de multiplexage d'accès sur des réseaux comprenant des paires métalliques Download PDF

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Publication number
WO2017060932A1
WO2017060932A1 PCT/IT2016/000232 IT2016000232W WO2017060932A1 WO 2017060932 A1 WO2017060932 A1 WO 2017060932A1 IT 2016000232 W IT2016000232 W IT 2016000232W WO 2017060932 A1 WO2017060932 A1 WO 2017060932A1
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WO
WIPO (PCT)
Prior art keywords
dslam
transmission
operators
vectoring
division
Prior art date
Application number
PCT/IT2016/000232
Other languages
English (en)
Inventor
Francesco Vatalaro
Franco Mazzenga
Romeo GIULIANO
Original Assignee
Krupter Srl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Krupter Srl filed Critical Krupter Srl
Priority to EP16812875.9A priority Critical patent/EP3414861A1/fr
Publication of WO2017060932A1 publication Critical patent/WO2017060932A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/0073—Allocation arrangements that take into account other cell interferences
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/32—Reducing cross-talk, e.g. by compensating
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0037—Inter-user or inter-terminal allocation
    • H04L5/0041—Frequency-non-contiguous
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/0075—Allocation using proportional fairness
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/22—Arrangements for supervision, monitoring or testing
    • H04M3/26—Arrangements for supervision, monitoring or testing with means for applying test signals or for measuring
    • H04M3/34—Testing for cross-talk

Definitions

  • the invention relates to the technical field of ultra-broadband transmissions (over 30 Mbit/s), with particular reference to fast access to the Internet and to other renowned services and contents (unicast video, etc.).
  • the invention relates to a method, and a system of electronic apparatuses that cooperate with one another to implement this method, designed to allow access multiplexing on networks with metallic pairs, through a division of the transmission frequencies into spectral resources destined for separate operators and individually subject to vectoring-type interference suppression techniques.
  • Recent evolution of access technologies on networks with metallic (copper) pairs enables transmission speeds (data-rates) in the order of tens/hundreds of Mbit/s to be reached, using system architectures of FttC (Fiber to the Cabinet) type and its variants or evolutions, such as FttB (Fiber to the Building) and FttDp (Fiber to the Distribution Point).
  • FttC Fiber to the Cabinet
  • FttB Fiber to the Building
  • FttDp Fiber to the Distribution Point
  • VDSL2 Very high bit-rate DSL type 2
  • G.993.2 Very high bit-rate DSL type 2
  • G.Fast G-series Fast Access to Subscriber Terminals
  • DSLAM DSL Access Multiplexer
  • CAB roadside cabinets
  • DP Distribution Points
  • Vectoring an interference suppression technique, called Vectoring, initially proposed by Ginis-Cioffi and subsequently internationally standardised as ITU-T G.993.5.
  • Vectoring ideally eliminates FEXT by pre-compensating downstream (DS) disturbances, i.e. directed toward the customer, and simultaneously cancelling upstream (US) disturbances, i.e. coming from the customer.
  • DS downstream
  • US upstream
  • vectoring has the noteworthy limitation of expressly requiring the presence of only one telecommunications operator on the cable of metallic pairs on which it is performed.
  • FEXT As the intensity of FEXT increases as a function of the transmission frequency used, on networks of metallic pairs the use of higher frequencies and in particular those higher than 17.66 MHz, is in fact excluded. Even for frequencies below 17.66 MHz, FEXT still causes a considerable reduction of the data-rate otherwise achievable on ideal transmission channels, i.e. in the presence of thermal noise alone.
  • Multi Operator Vectoring - MOV Multi Operator Vectoring - MOV
  • the object of the invention is to propose a method and a system of reference that allow the problems and the limits described above to be solved, making access multiplexing on networks with metallic pairs possible through a hierarchical division of the transmission frequencies into spectral resources reserved for separate operators and individually subject to vectoring-type interference suppression techniques, so as to enable the implementation of ultra-broadband transmissions by several operators connected on the same cable of metallic pairs and not coordinated or synchronised with one another.
  • the object of the invention is achieved with a method for access multiplexing on networks with metallic pairs according to the independent claim 1.
  • the invention also relates to a system for access multiplexing on networks with metallic pairs according to claim 7.
  • the method and the system for access multiplexing on networks with metallic pairs according to the invention through a particular division of the transmission frequencies into spectral resources destined for separate operators and individually subject to interference suppression techniques, for example of vectoring type, produce the following important advantages:
  • Fig. 1(a) schematically shows a possible hierarchical division of an ultra-broadband transmission frequency into sub-channels, sub- bands and related frequency slots reserved for separate operators according to the method of the invention
  • - Fig. 1(b) shows an example of hierarchical division of a sub-channel into sub-bands and of allocation of the related slots in the case of three operators
  • - Fig. 2 schematically shows an extended band DSLAM apparatus, designed to determine the division of an ultra-broadband transmission frequency into frequency sub-channels reserved for separate operators according to the method of the invention
  • FIG. 3 shows in a schematic block diagram, the operating logic of a control device for extended band DSLAM apparatuses, designed to enable access multiplexing on networks with metallic pairs according to the invention
  • FIG. 4 shows, in a schematic block diagram, an extended band DSLAM apparatus including the control device of Fig. 3;
  • FIG. 5 schematically shows a complete system architecture, of multi-CAB type, comprising extended band DSLAM apparatuses, designed to enable access multiplexing on networks with metallic pairs according to the invention
  • FIG. 6 graphically shows the data-rate values achievable when the transmission bandwidth changes, in different conditions of alien- FEXT and of distance, with or without access multiplexing on networks with metallic pairs according to the invention
  • FIG. 7 graphically shows the gain attainable on the downstream data-rate subject to vectoring, as a function of the CAB-NT (Cabinet
  • a method for access multiplexing on networks with metallic pairs substantially comprises the steps of:
  • the hierarchical structure of dividing the ultra-broadband transmission frequencies comprises, as non-limiting example, a first level of dividing into sub-channels, a second level of dividing the sub-channels into sub-bands and a last level of dividing the sub-bands into slots, which represent the spectral resources to be allocated to each operator, as represented in Figs. 1(a) and 1(b).
  • the first channel (/ 0), i.e., the channel that will occupy the band 0 - 17.66 MHz in the cable of metallic pairs, is not subject to vectoring if operating in a scenario of backward compatibility.
  • the baseband signals that correspond to the generic i-th channel (/ ⁇ 1) are translated by the baseband to higher frequencies, for example using a single sideband modulation, through specific SSB (Single Side Band) processors, followed by an appropriate conversion, through specific up- converters.
  • SSB Single Side Band
  • DMT Discrete Multi-Tone
  • the method of dividing into sub-bands Bi of the invention ensures compliance with a fairness criterion (dual fairness) between the customers distributed in the access network, regardless of the distance of customers from the cabinet (CAB) of reference, at least up to the maximum distance of coverage of the service.
  • a fairness criterion dual fairness
  • the technique based on the dual fairness criterion at sub-band level prevents customers of different operators, positioned on the same cable of metallic pairs, at the same distance from the cabinet of reference, from being served with different data-rates.
  • the technique of dividing the sub-bands based on the dual fairness criterion is therefore an essential element that distinguishes the method of the invention from a generic frequency division operation, as it is aimed at placing operators on equal terms in the supply of the access service both in terms of bit rates per user and of total band allocated per operator.
  • dual fairness technique is intended as a method of planning the channelling into sub-bands Bi and related division into slots, two examples of which are illustrated by way of non-limiting example in Figs. 1(a) and 1(b), designed to ensure fairness of band allocated per operator and to produce practically overlapping trends of the data-rate curves as a function of the CAB-NT (Cabinet - Network Termination) distance for any operator that connects its DSLAM to the seat of the CAB, up to the maximum distance of interest for supply of the service to the customers.
  • CAB-NT Combint - Network Termination
  • the method for access multiplexing according to the invention ensures compliance with the aforesaid dual fairness condition taking account of the propagation characteristics on the cable of metallic pairs and regardless of the geometrical arrangement of the customers of different operators within the area covered by the service.
  • Examples of hierarchical schemes of division of the band that ensure dual fairness are shown in Figs. 1(a) and 1(b), wherein the slots all have the same dimensions, regardless of the sub-bands, and are allocated to different operators (three in the example in Fig. 1(b)) according to an alternate and interleaved scheme.
  • the method of the invention can be applied both in the case of uneven division of the spectral resources and of dynamic division thereof.
  • a DSL channel that operates using frequencies even higher than 17.66 MHz can be generated in baseband using existing VDSL2 modulators, designed and optimised for the transmission band 0 - 17.66 MHz, together with vector processors of standard type, also operating on the transmission band 17.66 MHz. Therefore, the possibility of re-utilising existing technology can be a reason for choosing the sub-channel band of the standard profile 17a, also for the purpose of backward compatibility.
  • the method and the system of the invention will not be limited by the development of DSLAM apparatuses, dual band or higher, without fairness measures designed to enable them to be used by multiple operators.
  • a system designed to implement this method simply and inexpensively, consists in the sharing between several operators even of a single DSLAM apparatus, positioned in a cabinet or in a Distribution point, thereby determining a new form of frequency unbundling.
  • a system designed to implement this method simply and inexpensively, consists in the sharing between several operators even of a single DSLAM apparatus, positioned in a cabinet or in a Distribution point, thereby determining a new form of frequency unbundling.
  • the case of several DSLAM apparatuses, positioned in adjacent cabinets, each operating in different sub-bands with physical unbundling modes is operationally very similar.
  • a system for access multiplexing on networks with metallic pairs substantially comprises a control device 1 , having the task of implementing a DSLAM apparatus designed to allow the objects and the advantages specified above to be achieved through a controlled and intelligent alteration of the operation of a DSLAM apparatus associated therewith.
  • Said device 1 comprises at least:
  • subsystem 2 comprising enabling means of the carriers
  • subsystem 5 comprising means for monitoring the frequency spectrum and assessing the interferences thereon.
  • the subsystem 2 for enabling the carriers takes a central role, as it has the task of setting the parameters of all the extended band modem-routers (NT - Network Termination) interconnected with the DSLAM apparatus, constraining them to operate only on the carriers of interest, according to the specifications of the desired frequency division, both for downstream DS transmissions and for upstream US transmissions.
  • NT - Network Termination extended band modem-routers
  • the aforesaid device 1 performs at least one of the following functions:
  • the extended band modulator MOD DMT of the DSLAM apparatus specifies the carrier values that the extended band modulator MOD DMT of the DSLAM apparatus must use to transmit on the downstream stretch (the carriers to use are defined based on the slots assigned to the operator or according to the spectral planning established for the operator);
  • the DSLAM apparatus uses a signalling channel from the DSLAM apparatus to the modems on the user's side to indicate which carriers must be used to receive the symbols sent on the downstream stretch.
  • the aforesaid device 1 performs at least following functions:
  • the device 1 can implement functions of monitoring and controlling the status of transmissions, both upstream US and downstream DS, and assessing interference produced by operators on adjacent channels, with signalling of any faults, through a specific unit 5 that also uses the information relating to the signal-to-interference-plus-noise ratio (SINR) on each sub-carrier of each user and the estimates of the transmission channels.
  • SINR signal-to-interference-plus-noise ratio
  • the device 1 can also be controlled both locally and remotely, through a specific interface 4 that enables the carrier values to be set for both downstream DS transmissions and upstream US transmissions.
  • the device 1 can be used to implement dynamic division techniques of the frequency spectrum, designed to increase spectral efficiency based on bilateral (or multilateral) agreements between operators connected to the same CAB, or to the same DP.
  • a dynamic management of the frequency spectrum enables operators to optimally serve a different number of customers and/or applications that require different data-rate values, with the result that the data traffic load is equalised in the sub-bands.
  • temporary transfer of one or more slots in one or more sub-bands to the operator that supports the highest traffic load causes a data-rate benefit to its customers without penalising the customers of the operator that temporarily transfers or more slots.
  • both operators benefit from dynamic management of the frequency spectrum available and the transmission quality is on average better for all the customers served by them.
  • the device 1 in its configuration for dynamic use of the frequency band available, can include some measures that, however, do not require the exchange of private information between operators.
  • a service channel for exchanging synthetic traffic data, and a management protocol of a shared algorithm to automatically negotiate the band and for any cross charging, are needed.
  • the definition of a frame time, at the level of DSLAM apparatus (10 ms, or similar), useful to periodically mark resource negotiation with "band on demand” techniques, is particularly advantageous (in the case of a single DSLAM apparatus shared among them). For DSLAM apparatus of the same manufacturer, temporal synchronisation of several DSLAM apparatus can take place.
  • the resource negotiation unit performs at least the following functions:
  • downstream transmission DS the multiple signal received by two or more operators on a single optical fibre with wavelength multiplexing (or, likewise, on the same number of fibres as the number of operators) is first converted into an electrical signal and then demultiplexed, with appropriate demultiplexers DEMUX, to be inserted into two or more separate vectoring groups (the same number as the number of operators involved).
  • the FEXT processor (DS Vectoring - FEXT precoder), with appropriate symbol coders (Symbol Cod.), pre-compensates and then routes the DMT streams in parallel to the DSL carriers (for example, with band of 4 kHz), selected based on the command from the control device 1 , the input of which receives the control signals from the operators, locally or from a remote location.
  • DSL carriers for example, with band of 4 kHz
  • this operation is carried out during installation and is destined to remain until the configuration of the operators connected to the cabinet or to the Distribution point changes.
  • a continuous negotiation is performed at slot level (in one or more sub-bands, such as 5 MHz, or similar), which can be periodically exchanged among the users.
  • this architecture can be used both with current DSLAM VDSL2 in the band 0 - 17.66 MHz and with future extended band DSLAM DSL, operating above 17.66 MHz, and by virtue of removal of FEXT, it allows several operators to increase the data-rate offered to customers without acting, for example, on the existing multi-CAB configurations.
  • This variant has the advantage of an operating flexibility that enables operators to evolve their access networks without coordinating future system choices with one another.
  • an operator connected to a cabinet (CAB) of reference can extend, separately from the other operators, the band used without affecting, for technical reasons, their choices.
  • each operator can extend its fibre optic in the vicinity of the buildings (with DSL, G.Fast or other technologies) maintaining the availability of the sub-bands allocated to them, again without technically affecting the other operators.
  • the operators will decide to coordinate with one another in time, to reallocate, by mutual consent, the spectrum on which each of them, for the portion available to them, will implement vectoring, and the NT (network Termination) home router of all customers will be replaced, passing for example from the standard according to the profile 17a to the new system operating at frequencies higher than 17.66 MHz.
  • each operator will implement vectoring in its own sub-bands separately from the others, without the need to synchronise or coordinate with the others and will only replace the home routers of its own customers.
  • the method and the system of the invention enable vectoring to be used where, for example, the national regulatory authority (NRA) imposes the obligation of Sub Loop Unbundling (SLU) to promote competition.
  • the national regulatory authority (NRA) imposes the obligation of Sub Loop Unbundling (SLU) to promote competition.
  • SLU Sub Loop Unbundling
  • the national regulatory authority (NRA) allocates some sub-bands to the operators of electronic communications that request them, which are free to operate within the spectrum allocated to them.
  • the method and the system of the invention are applicable to any DSL standard, including the G.Fast standard, which in the future may suffer, just as VDSL2, from limitations of performances if adopted in the presence of several operators while the SLU regulatory obligation is in force.
  • the method and the system of the invention allow the implementation of system solutions suitable to achieve the objectives established in Europe and in other countries for ultra-broadband infrastructures, thus expanding the technological alternatives available to operators.
  • the method and the system of the invention ensure true advantages in the presence of multi-operator scenarios with extended band solutions as FEXT depends greatly on the transmission frequency used and alien-FEXT tends to limit the benefit of spectral expansion, in the presence of separate vectoring groups.
  • Fig. 6 compares the data-rate values in the case of SBV (Sub Band Vectoring) division of the transmission band and FBV (Full Band Vectoring) sharing of the whole band by the two vectoring groups. Fig. 6 confirms that expansion of the band is in fact inefficient in the presence of vectoring, unless alien-FEXT is eliminated and, at the same time, that the number of interferents, J, has little influence, as even only a few interfering pairs are sufficient to penalise the whole vectoring group.
  • SBV Sub Band Vectoring
  • FBV Fel Band Vectoring
  • Fig.7 shows how, even with only two operators, the gain G can be modest (0.3 ⁇ 0.5) even for high bands of the DSLAM, while its value becomes very large (6 ⁇ 8) with the use of transmission band division, made possible by the method and by the system of the invention.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Small-Scale Networks (AREA)

Abstract

L'invention concerne un procédé original de multiplexage d'accès en fréquence sur des réseaux comprenant des paires métalliques et un système d'appareils électroniques de référence qui peuvent collaborer les uns avec les autres pour implémenter ledit procédé. Le procédé de multiplexage d'accès sur des réseaux comprenant des paires métalliques comprend les étapes consistant à : diviser des fréquences de transmission ultra-large bande dans une structure hiérarchique organisée en bandes dont le dernier niveau comprend des ressources spectrales obtenues en appliquant un critère d'équité double; réserver lesdites ressources spectrales obtenues par la division susmentionnée dans une structure hiérarchique pour des opérateurs séparés; appliquer des procédés de suppression de brouillage sur lesdites ressources spectrales.
PCT/IT2016/000232 2015-10-09 2016-10-07 Procédé et système de multiplexage d'accès sur des réseaux comprenant des paires métalliques WO2017060932A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP16812875.9A EP3414861A1 (fr) 2015-10-09 2016-10-07 Procédé et système de multiplexage d'accès sur des réseaux comprenant des paires métalliques

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITUB2015A004279A ITUB20154279A1 (it) 2015-10-09 2015-10-09 Metodo e sistema di multiplazione in accesso su reti a coppie metalliche
IT102015000060081 2015-10-09

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WO2017060932A1 true WO2017060932A1 (fr) 2017-04-13

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010019486A2 (fr) * 2008-08-13 2010-02-18 Ikanos Communications, Inc. Retrait d'interférence étrangère dans une ligne d'abonné numérique vectorisée
WO2011070564A1 (fr) * 2009-12-08 2011-06-16 Eci Telecom Ltd. Appareil de communication doté de capacités de gestion dynamique du spectre
US20140362677A1 (en) * 2011-12-23 2014-12-11 Actelis Networks (Israel) Ltd. Cable-level crosstalk reduction
EP2963904A1 (fr) * 2014-07-03 2016-01-06 Alcatel Lucent Opération de vectorisation améliorée avec fractionnement à boucle unique

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010019486A2 (fr) * 2008-08-13 2010-02-18 Ikanos Communications, Inc. Retrait d'interférence étrangère dans une ligne d'abonné numérique vectorisée
WO2011070564A1 (fr) * 2009-12-08 2011-06-16 Eci Telecom Ltd. Appareil de communication doté de capacités de gestion dynamique du spectre
US20140362677A1 (en) * 2011-12-23 2014-12-11 Actelis Networks (Israel) Ltd. Cable-level crosstalk reduction
EP2963904A1 (fr) * 2014-07-03 2016-01-06 Alcatel Lucent Opération de vectorisation améliorée avec fractionnement à boucle unique

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
COLMEGNA ET AL: "Methods for Supporting Vectoring when Multiple Service Providers Share the Cabinet Area", 1 April 2012 (2012-04-01), XP055095498, Retrieved from the Internet <URL:http://www.assia-inc.com/technology/knowledge-center/white-papers/FASTWEB-ASSIA_White_Paper_on_Vectoring_(April 2012).pdf> [retrieved on 20140109] *
FRANCESCO VATALARO ET AL: "The Sub-band Vectoring Technique for Multi-Operator Environments", 24 March 2016 (2016-03-24), XP055275092, Retrieved from the Internet <URL:https://arxiv.org/ftp/arxiv/papers/1603/1603.07693.pdf> [retrieved on 20160524] *
PETER SILVERMANN (EDITOR): "Techniques to Mitigate Uncancelled Crosstalk on Vectored VDSL2 Lines Techniques to Mitigate Uncancelled Crosstalk on Vectored VDSL2 Lines", 16 May 2014 (2014-05-16), XP055275485, Retrieved from the Internet <URL:https://www.broadband-forum.org/technical/download/TR-320.pdf> [retrieved on 20160525] *
S. VANHASTEL, P. SPRUYT: "VDSL2 Vectoring in a Multi-operator Environment - Separating Fact from Fiction | TechZine | Alcatel-Lucent", 21 March 2012 (2012-03-21), XP055275038, Retrieved from the Internet <URL:https://techzine.alcatel-lucent.com/vdsl2-vectoring-multi-operator-environment-separating-fact-fiction> [retrieved on 20160524] *

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ITUB20154279A1 (it) 2017-04-09

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