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

Status
Published
Publication Date
13-Nov-2014
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
18-Jun-2014
Due Date
23-Aug-2014
Completion Date
14-Nov-2014

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SLOVENSKI STANDARD
SIST-TP CLC/TR 50083-2-2:2014
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
SIST-TP CLC/TR 50083-2-2:2014 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST-TP CLC/TR 50083-2-2:2014
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SIST-TP CLC/TR 50083-2-2:2014
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
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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

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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.

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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.

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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.
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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 the return path direction.
3.1.12
regional broadband cable networks

networks designed to provide sound and television signals as well as signals for interactive services to a

regional area covering several towns and/or villages
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3.1.13
SMATV networks

originally defined as Satellite Master Antenna Television networks, now covering extended 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.

3.2 Abbreviations
For the purposes of this document, the following abbreviations are used.
AM Amplitude Modulation
BER Bit Error Ratio
BS Base Station
CATV Community Antenna Television (network)
ch. Channel
DOCSIS Data Over Cable Service Interface Specification
e.m. Electromagnetic
EMC Electromagnetic Compatibility
EMI Electromagnetic Interference
EuroDOCSIS European Data Over Cable Service Interface Specification
EUT Equipment Under Test
LO Local Oscillator
LTE Long Term Evolution
LTE-BS Long Term Evolution Base Station
LTE-UE Long Term Evolution User Equipment
MoCA Multimedia over Cable Alliance
RBW Resolution Bandwidth
RF Radio Frequency
TDMA Time Division Multiple Access
TV Television
UE User Equipment
WiFi Synonym of WLAN
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3.3 Symbols

For the purposes of this document, the following graphical symbols are used. These symbols are either listed

in IEC 60617 (all parts) or based on symbols defined in IEC 60617 (all parts).
Graphical symbol Reference number Graphical symbol Reference number
and title and title
Receiving antenna Amplifier
IEC 60617 [S01239]
Low pass filter Band-pass filter
IEC 60617 [SO1248] IEC 60617 [S01249]
Level meter Stop-band filter
IEC 60617 [S01250]
4 Implications of the LTE service in the 800 MHz band
4.1 Frequency allocation of LTE signals in the 800 MHz band

The frequency allocation of the LTE signals in the 800 MHz band is indicated in Figure 1. The downlink (from

the LTE-BS (Base Station) to the LTE-UE (User Equipment)) is allocated in the frequency range 791 MHz to

821 MHz, while the uplink (from LTE-UE to LTE-BS) is allocated in the frequency range 832 MHz to

862 MHz. The duplex gap, 11 MHz wide, is between 821 MHz and 832 MHz. The guard band, between the

last TV channel 60 in the UHF broadcasting band and the mobile communications band, is only 1 MHz wide.

Figure 1 — Allocation of the LTE signals in the 800 MHz band
4.2 Propagation models

The field produced by the LTE-UE at short distances (a few metres) inside a room of a building can be

calculated considering that the interfered apparatus or network is in line of sight and therefore a free space

model is used. This model allows simple calculations and worst case approach.

The field produced by the LTE-BS at the location of the television antenna used for DVB-T signals reception

can be calculated considering
a) the LTE-BS transmitting antenna radiation diagram (vertical pattern),

b) the television receiving antenna is in line of sight but at a different height with respect to LTE-BS

transmitting antenna.
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In this instance, therefore, the CEPT Report 30 propagation model (Annex 6), instead of the free space

model, is used.

NOTE The transmitting antenna height (LTE-BS) is assumed to be 30 m and the television receiving antenna height is

assumed to be 10 m or lower.
4.3 LTE-UE field strength in the 800 MHz band

The maximum radiated power P by a LTE User Equipment (LTE-UE) in the 832 MHz to 862 MHz band, can

reach 25 dB(mW) and can produce a field strength E at the distance D, to be calculated by the formula:

30P
. (1)

In Table 1 the calculated values of field strength E at different distances D (in free space) are presented.

Table 1 — Field strength E produced at a distance D (free space) by a radiated power P of 25 dB(mW)

of a LTE-UE
D E E
m V/m dB(μV/m)
3 1,0 120
5 0,6 116
10 0,3 110

With reference to Table 1, at a distance of 3 m, the LTE-UE can produce a field strength of 120 dB(μV/m)

(1 V/m) in the 832 MHz to 862 MHz band and, therefore, may be considered as a disturbing signal mainly

within a room of a building.
4.4 LTE-BS field strength in the 800 MHz band

The radiated power P by a LTE Base Station (LTE-BS) in the 791 MHz to 821 MHz band, due to the LTE

transmitter power P and the LTE antenna gain G , can produce a field strength E at the distance D, to be

T a
calculated using the CEPT Report 30 propagation model.

In Table 2 the calculated values of field strength E at different distances D (in free space) are indicated. The

radiated power P (EIRP) depends on the site location (rural or urban) of the LTE Base Station. The distances

D considered in Table 2 are related to field strengths in the range from 120 dB(μV/m) to 106 dB(μV/m).

Table 2 — Field stre
...

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