CLC/TR 50083-2-2:2014
(Main)Cable networks for television signals, sound signals and interactive services - Part 2-2: Interference issues for DVB-T reception in the presence of LTE base station signals
Cable networks for television signals, sound signals and interactive services - Part 2-2: Interference issues for DVB-T reception in the presence of LTE base station signals
The Technical Reports describes the interference situation which may occur when besides the wanted broadcast signals of DVB-T/-T2 formats also signals from base stations of mobile radio services (unwanted signals) are received by the same terrestrial broadcast antenna and by an active equipment (amplifier) directly connected to the antenna output. The TR relates in a first step to the special frequency neighbourhood situation between DVB-T signals up to 790 MHz (channel 60) and LTE base station signals starting at 791 MHz. This neighbourhood situation is currently already in operation in many European countries. The TR proposes different measures by which such interference situations can be reduced to an acceptable level or can even be completely avoided. Measures are described for application in already installed networks and also in new networks to be installed in the future.
Kabelnetze für Fernsehsignale, Tonsignale und interaktive Dienste - Teil 2-2: Störaspekte für den DVB-T-Empfang unter Einwirkung von LTE-Basisstations-Signalen
Réseaux de distribution par câbles pour signaux de télévision, signaux de radiodiffusion sonore et services interactifs - Partie 2-2: Problèmes de perturbations concernant la réception de signaux DVB-T en présence de signaux émis par les stations de base LTE
Kabelska omrežja za televizijske in zvokovne signale ter interaktivne storitve - 2-2. del: Vprašanje motenj za sprejem DVB-T pod vplivom signalov baznih postaj
Standardi in izsledki skupin standardov EN 50083 (vsi deli) in EN 60728 (vsi deli) obravnavajo kabelska omrežja, vključno z opremo in povezanimi metodami za merjenje sprejema glavne sprejemne postaje, obdelavo in distribucijo televizijskih in zvokovnih signalov ter za obdelavo, povezovanje in oddajanje vseh vrst podatkovnih signalov za interaktivne storitve prek vseh primernih prenosnih medijev. Ti signali se v omrežjih običajno prenašajo s tehnikami multipleksiranja frekvenc. To na primer vključuje a) regionalna in lokalna širokopasovna kabelska omrežja, b) razširjene satelitske in prizemne televizijske distribucijske sisteme, c) posamezne satelitske in prizemne televizijske sprejemne sisteme ter vse vrste opreme, sistemov in naprav, uporabljene v tovrstnih kabelskih omrežjih, distribucijskih in sprejemnih sistemih. To standardizacijsko delo med drugim zajema antene in/ali posebne vhode virov signalov v glavno sprejemno postajo ali druge vmesniške točke do omrežja vse do vhodnega terminala opreme v prostorih stranke. To standardizacijsko delo bo upoštevalo soobstoj uporabnikov radiofrekvenčnega spektra v ožičenih in brezžičnih prenosnih sistemih. Standardizacija poljubnih uporabniških terminalov (tj. uglaševalnikov, sprejemnikov, kodirnikov, večpredstavnostnih terminalov itd.) in poljubnih povezanih koaksialnih, simetričnih in optičnih kablov ter opreme je izključena.
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-december-2014
Kabelska omrežja za televizijske in zvokovne signale ter interaktivne storitve - 2-2.
del: Vprašanje motenj za sprejem DVB-T pod vplivom signalov baznih postaj
Cable networks for television signals, sound signals and interactive services - Part 2-2:
Interference issues for DVB-T reception in the presence of LTE base station signals
Kabelnetze für Fernsehsignale, Tonsignale und interaktive Dienste - Teil 2-2:
Störaspekte für den DVB-T-Empfang unter Einwirkung von LTE-Basisstations-Signalen
Réseaux de distribution par câbles pour signaux de télévision, signaux de radiodiffusion
sonore et services interactifs - Partie 2-2: Problèmes de perturbations concernant la
réception de signaux DVB-T en présence de signaux émis par les stations de base LTE
Ta slovenski standard je istoveten z: CLC/TR 50083-2-2:2014
ICS:
33.060.40 Kabelski razdelilni sistemi Cabled distribution systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
TECHNICAL REPORT CLC/TR 50083-2-2
RAPPORT TECHNIQUE
TECHNISCHER BERICHT
October 2014
ICS 33.060.40; 33.100.01
English Version
Cable networks for television signals, sound signals and
interactive services - Part 2-2: Interference issues for DVB-T
reception in the presence of LTE base station signals
Réseaux de distribution par câbles pour signaux de Kabelnetze für Fernsehsignale, Tonsignale und interaktive
télévision, signaux de radiodiffusion sonore et services Dienste - Teil 2-2: Störaspekte für den DVB-T-Empfang
interactifs - Partie 2-2: Problèmes de perturbations unter Einwirkung von LTE-Basisstations-Signalen
concernant la réception de signaux DVB-T en présence de
signaux émis par les stations de base LTE
This Technical Report was approved by CENELEC on 2014-10-13.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2014 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. CLC/TR 50083-2-2:2014 E
Contents
Foreword . 3
1 Scope . 4
1.1 General . 4
1.2 Specific scope of CLC/TR 50083-2-2 . 4
2 Normative references . 5
3 Term, definitions, symbols and abbreviations . 5
3.1 Terms and definitions . 5
3.2 Abbreviations . 7
3.3 Symbols . 8
4 Implications of the LTE service in the 800 MHz band . 8
4.1 Frequency allocation of LTE signals in the 800 MHz band . 8
4.2 Propagation models . 8
4.3 LTE-UE field strength in the 800 MHz band. 9
4.4 LTE-BS field strength in the 800 MHz band . 9
5 Protection of television signals with respect to the LTE service . 10
5.1 Provisions to be applied . 10
5.2 EMC protection with respect to LTE-UE signals . 10
5.3 EMC protection with respect to LTE-BS signals. 11
6 Additional EMC requirements with respect to LTE-UE disturbing field . 13
7 Additional EMC requirements with respect to LTE-BS disturbing field. 13
7.1 General . 13
7.2 Worst case . 13
7.3 Intermediate case . 14
7.4 Typical case . 15
8 Typical LTE filter specifications . 16
9 Measurements to determine the required attenuation for the LTE filter . 18
Bibliography . 19
- 3 - CLC/TR 50083-2-2:2014
Foreword
This document (CLC/TR 50083-2-2:2014) has been prepared by CLC/TC 209 “Cable networks for television
signals, sound signals and interactive services”.
This document is currently submitted to voting in accordance with the Internal Regulations, Part 2,
Subclause 11.4.3.3 (simple majority) for acceptance as a CENELEC Technical Report.
1 Scope
1.1 General
Standards and deliverables of EN 50083 (all parts) and EN 60728 (all parts) deal with cable networks
including equipment and associated methods of measurement for headend reception, processing and
distribution of television and sound signals and for processing, interfacing and transmitting all kinds of data
signals for interactive services using all applicable transmission media. These signals are typically
transmitted in networks by frequency-multiplexing techniques.
For instance, this includes
a) regional and local broadband cable networks,
b) extended satellite and terrestrial television distribution systems,
c) individual satellite and terrestrial television receiving systems,
and all kinds of equipment, systems and installations used in such cable networks, distribution and receiving
systems.
The extent of this standardization work is from the antennas and/or special signal source inputs to the
headend or other interface points to the network up to the terminal input of the customer premises
equipment.
The standardization work will consider coexistence with users of the RF spectrum in wired and wireless
transmission systems.
The standardization of any user terminals (i.e. tuners, receivers, decoders, multimedia terminals etc.) as well
as of any coaxial, balanced and optical cables and accessories thereof is excluded.
1.2 Specific scope of CLC/TR 50083-2-2
The radiated fields produced by LTE Base Stations (LTE-BS) need special and careful attention when
received by individual or community antenna television systems because of high level signals injected at the
input port of wideband amplifiers placed on the antenna mast or in the headend. These high level disturbing
signals in the 800 MHz band are able to cause interference problems by producing overload and/or strong
intermodulation products in wide band amplifiers and to disturb or even prevent the reception of digital
television signals (DVB-T) broadcast in VHF/UHF bands.
This interference problem, in a frequency band previously assigned to terrestrial television broadcasting and
now to broadband telecommunication services, can be avoided or reduced both with an appropriate suitable
screening efficiency of cable network and equipment and by using an appropriate and suitable filter (LTE
filter) to attenuate the 800 MHz band signals received by the television antenna system and injected
(conducted interference) at the input port of wideband amplifiers.
Some examples of EMC requirements relating to LTE-BS disturbing signals are described (see Clause 7)
and the main characteristics of a typical LTE filter (see Clause 8) are indicated.
These additional EMC requirements for cable networks and equipment, resulting from the assignment of the
800 MHz band to LTE services, are based on:
a) the expected field strengths in the 800 MHz band due to both LTE User Equipment (LTE-UE) and LTE
Base Station (LTE-BS), considered as disturbing signals;
b) the field strengths planned for terrestrial television broadcasting in the UHF band, up to 790 MHz (e.g.
ch. 60),
c) the required protection of television signals with respect to both LTE-UE and LTE-BS disturbing fields.
- 5 - CLC/TR 50083-2-2:2014
Both LTE-BS disturbing effects and LTE-UE disturbance effects and protection requirements are therefore
considered in this technical report.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
EN 50083-2, Cable networks for television signals, sound signals and interactive services - Part 2:
Electromagnetic compatibility for equipment
IEC 60050-161, International Electrotechnical Vocabulary (IEV) - Chapter 161: Electromagnetic compatibility
CEPT Report 30:2009, The identification of common and minimal (least restrictive) technical conditions for
790 - 862 MHz for the digital dividend in the European Union
3 Term, definitions, symbols and abbreviations
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-161 and the following apply.
3.1.1
CATV network
originally defined as Community Antenna Television network; now covering regional and local broadband
cable networks, designed to provide sound and television signals as well as signals for interactive services to
a regional or local area
3.1.2
electromagnetic-active equipment
all passive and active equipment carrying RF signals is considered as electromagnetic-active equipment
because it is liable to cause electromagnetic disturbances or the performance of them and is liable to be
affected by such disturbances
3.1.3
extended satellite television distribution networks or systems
distribution networks or systems designed to provide sound and television signals received by satellite
receiving antenna to households in one or more buildings
Note 1 to entry: This kind of network or system could eventually be combined with terrestrial antennas for the additional
reception of TV and/or radio signals via terrestrial networks.
Note 2 to entry: This kind of network or system could also carry control signals for satellite switched systems or other
signals for special transmission systems (e.g. MoCA or WiFi) in the return path direction.
3.1.4
extended terrestrial television distribution networks or systems
distribution networks or systems designed to provide sound and television signals received by terrestrial
receiving antenna to households in one or more buildings
Note 1 to entry: This kind of network or system could eventually be combined with a satellite antenna for the additional
reception of TV and/or radio signals via satellite networks.
Note 2 to entry: This kind of network or system could also carry other signals for special transmission systems (e.g.
MoCA or WiFi) in the return path direction.
3.1.5
individual satellite television receiving systems
systems designed to provide sound and television signals received from satellite(s) to an individual
household
Note 1 to entry: This kind of system could also carry control signals for satellite switched systems or other signals for
special transmission systems (e.g. MoCA or WiFi) in the return path direction.
3.1.6
individual terrestrial television receiving systems
systems designed to provide sound and television signals received via terrestrial broadcast networks to an
individual household
Note 1 to entry: This kind of system could also carry other signals for special transmission systems (e.g. MoCA or WiFi)
in the return path direction.
3.1.7
local broadband cable networks
networks designed to provide sound and television signals as well as signals for interactive services to a
local area (e.g. one town or one village)
3.1.8
LTE
Long Term Evolution service for broadband telecommunication networks
3.1.9
LTE-BS
Base Station used in Long Term Evolution service for broadband telecommunication networks
3.1.10
LTE-UE
User Equipment used in Long Term Evolution service for broadband telecommunication networks
3.1.11
MATV networks
originally defined as Master Antenna Television networks, now covering extended terrestrial television
distribution networks or systems designed to provide sound and television signals received by terrestrial
receiving antenna to households in one or more buildings
Note 1 to entry: This kind of network or system could eventually be combined with a satellite antenna for the additional
reception of TV and/or radio signals via satellite networks.
Note 2 to entry: This kind of network or system could also carry other signals for special transmission systems (e.g.
MoCA or WiFi) in th
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.