Fixed Radio Systems; Conformance testing; Part 2-3: Point-to-Multipoint equipment; Test procedures for TDMA systems

REN/TM-04154

Fiksni radijski sistemi – Preskušanje skladnosti – 2-3. del: Oprema tipa točka-več točk – Preskusni postopki za sisteme TDMA

General Information

Status
Published
Publication Date
15-Nov-2004
Current Stage
12 - Completion
Due Date
26-Nov-2004
Completion Date
16-Nov-2004

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SLOVENSKI STANDARD
SIST EN 301 126-2-3 V1.2.1:2006
01-marec-2006

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Fixed Radio Systems; Conformance testing; Part 2-3: Point-to-Multipoint equipment; Test

procedures for TDMA systems
Ta slovenski standard je istoveten z: EN 301 126-2-3 Version 1.2.1
ICS:
33.060.30 Radiorelejni in fiksni satelitski Radio relay and fixed satellite
komunikacijski sistemi communications systems
SIST EN 301 126-2-3 V1.2.1:2006 en

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

---------------------- Page: 1 ----------------------
SIST EN 301 126-2-3 V1.2.1:2006
---------------------- Page: 2 ----------------------
SIST EN 301 126-2-3 V1.2.1:2006
ETSI EN 301 126-2-3 V1.2.1 (2004-11)
European Standard (Telecommunications series)
Fixed Radio Systems;
Conformance testing;
Part 2-3: Point-to-Multipoint equipment;
Test procedures for TDMA systems
---------------------- Page: 3 ----------------------
SIST EN 301 126-2-3 V1.2.1:2006
2 ETSI EN 301 126-2-3 V1.2.1 (2004-11)
Reference
REN/TM-04154
Keywords
DRRS, FWA, multipoint, radio, RLL, SDH,
testing, transmission, architecture, TDMA
ETSI
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Copyright Notification
No part may be reproduced except as authorized by written permission.
The copyright and the foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 2004.
All rights reserved.
TM TM TM

DECT , PLUGTESTS and UMTS are Trade Marks of ETSI registered for the benefit of its Members.

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ETSI
---------------------- Page: 4 ----------------------
SIST EN 301 126-2-3 V1.2.1:2006
3 ETSI EN 301 126-2-3 V1.2.1 (2004-11)
Contents

Intellectual Property Rights................................................................................................................................4

Foreword.............................................................................................................................................................4

1 Scope........................................................................................................................................................6

2 References................................................................................................................................................6

3 Definitions, symbols and abbreviations ...................................................................................................7

3.1 Definitions..........................................................................................................................................................7

3.2 Symbols..............................................................................................................................................................7

3.3 Abbreviations.....................................................................................................................................................7

4 General characteristics.............................................................................................................................7

4.1 Equipment configuration....................................................................................................................................8

4.1.1 System configuration....................................................................................................................................9

4.2 Transmitter characteristics................................................................................................................................10

4.2.1 Maximum RF output power........................................................................................................................10

4.2.2 Minimum RF output power (if applicable).................................................................................................11

4.2.3 Automatic Transmit Power Control (ATPC)..............................................................................................11

4.2.4 Remote Transmit Power Control (RTPC)...................................................................................................12

4.2.5 Frequency accuracy....................................................................................................................................12

4.2.6 RF spectrum mask......................................................................................................................................12

4.2.7 Remote Frequency Control.........................................................................................................................13

4.2.8 Spectral lines at the symbol rate .................................................................................................................13

4.2.9 Spurious emissions (External) ....................................................................................................................14

4.3 Receiver characteristics....................................................................................................................................15

4.3.1 Input level range (if applicable)..................................................................................................................15

4.3.2 Spurious emissions.....................................................................................................................................16

4.4 System Characteristics.....................................................................................................................................16

4.4.1 Dynamic level range ...................................................................................................................................16

4.4.2 BER as a function of receiver input signal level RSL ................................................................................17

4.4.3 Equipment Background BER......................................................................................................................17

4.4.4 Interference sensitivity................................................................................................................................18

4.4.4.1 Co-channel Interference Sensitivity......................................................................................................18

4.4.4.2 Adjacent RF-Channel Interference Sensitivity......................................................................................20

4.4.4.3 CW Spurious Interference.....................................................................................................................21

History ..............................................................................................................................................................23

ETSI
---------------------- Page: 5 ----------------------
SIST EN 301 126-2-3 V1.2.1:2006
4 ETSI EN 301 126-2-3 V1.2.1 (2004-11)
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 found

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://webapp.etsi.org/IPR/home.asp).

Pursuant to the ETSI IPR Policy, 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 European Standard (Telecommunications series) has been produced by ETSI Technical Committee Transmission

and Multiplexing (TM).

The present document is part 2-3 of a multi-part deliverable covering the Fixed Radio Systems; Conformance testing, as

identified below:

Part 1: "Point-to-Point equipment; Definitions, general requirements and test procedures";

Part 2-1: "Point-to-Multipoint equipment; Definitions and general requirements";
Part 2-2: "Point-to-Multipoint equipment; Test procedures for FDMA systems";
Part 2-3: "Point-to-Multipoint equipment; Test procedures for TDMA systems";
Part 2-4: "Point-to-Multipoint equipment; Test procedures for FH-CDMA systems";
Part 2-5: "Point-to-Multipoint equipment; Test procedures for DS-CDMA systems";

Part 2-6: "Point-to-Multipoint equipment; Test procedures for Multi Carrier Time Division Multiple Access

(MC-TDMA) systems";

Part 3-1: "Point-to-Point antennas; Definitions, general requirements and test procedures";

Part 3-2: "Point-to-Multipoint antennas; Definitions, general requirements and test procedures".

This part 2-3 of EN 301 126 defines harmonized test methods for the conformity assessment testing of point-to-

multipoint fixed radio systems applying time division multiple access method (TDMA). It should be noted that the

present document can only be applied in conjunction with part one.

The part 2-1 of EN 301 126 defines the conformity assessment testing requirements (definitions and general

requirements) for radio specific parameters required directly by the relevant EN/ETS for point-to-multipoint systems.

Annex A of that part one contains the supplier's declaration, annex B contains the test report format.

It is recommended that where a clarification of a test procedure or an agreed test procedure is required, this should be

described on the final page of the test report titled "Additional information supplementary to the test report".

ETSI
---------------------- Page: 6 ----------------------
SIST EN 301 126-2-3 V1.2.1:2006
5 ETSI EN 301 126-2-3 V1.2.1 (2004-11)
National transposition dates
Date of adoption of this EN: 12 November 2004
Date of latest announcement of this EN (doa): 28 February 2005
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 31 August 2005
Date of withdrawal of any conflicting National Standard (dow): 31 August 2005
ETSI
---------------------- Page: 7 ----------------------
SIST EN 301 126-2-3 V1.2.1:2006
6 ETSI EN 301 126-2-3 V1.2.1 (2004-11)
1 Scope

The present document details standardized test procedures for conformance testing of equipment for

Point-to-MultiPoint (P-MP) digital radio relay systems applying time division multiple access method (TDMA).

Optionally, for certain of the system types defined in the present document, other access methods (e.g. Orthogonal

Frequency Division Multiple Access (OFDMA)) may be used in conjunction with TDMA to provide another dimension

of multiple access.

Standardized procedures are required in order to fulfil ECC/DEC/(04)04 [1] on the mutual recognition, within CEPT, of

the results of conformance tests on equipment carried out in individual CEPT Countries. Furthermore the procedures

described in the present document are relevant to be able to fulfil the conformance assessment procedure described in

Chapter II of the Directive 1999/5/EC [3] in order to demonstrate the compliance of the DRRS with the relevant

Essential Requirements identified in Article 3.2 of the Directive 1999/5/EC [3].

The present document is intended to be applied in conjunction with EN 301 126-2-1 [2] and in conjunction with the

individual equipment ENs/ETSs describing TDMA methods and will enable commonality of test results, irrespective of

the Supplier or the Notified Body carrying out the test.

The conformance tests described in the present document are those related to radio specific parameters required directly

by the relevant radio relay ENs/ETSs. Conformance tests to other boundary EN/ETS (e.g. those for system input/output

interfaces and related base band process) are outside the scope of the present document.

2 References

The following documents contain provisions which, through reference in this text, constitute provisions of the present

document.

• References are either specific (identified by date of publication and/or edition number or version number) or

non-specific.
• For a specific reference, subsequent revisions do not apply.
• For a non-specific reference, the latest version applies.

Referenced documents which are not found to be publicly available in the expected location might be found at

http://docbox.etsi.org/Reference.
[1] ECC/DEC/(04)04: "ECC Decision of 19 March 2004 on the withdrawal of the ERC

Decision (97)10 "ERC Decision of 30 June 1997 on the mutual recognition of conformity

assessment procedures including marking of radio equipment and radio terminal equipment".

[2] ETSI EN 301 126-2-1: "Fixed Radio Systems; Conformance testing; Part 2-1: Point-to-Multipoint

equipment; Definitions and general requirements".

[3] Directive 1999/5/EC of the European Parliament and of the Council of 9 March 1999 on radio

equipment and telecommunications terminal equipment and the mutual recognition of their

conformity (R&TTE Directive).
[4] CEPT/ERC/REC 74-01: "Spurious emissions".

[5] CENELEC EN 60835-1: "Methods of measurement for equipment used in digital microwave radio

transmission systems - Part 1: Measurements common to terrestrial radio-relay systems and

satellite earth stations".
ETSI
---------------------- Page: 8 ----------------------
SIST EN 301 126-2-3 V1.2.1:2006
7 ETSI EN 301 126-2-3 V1.2.1 (2004-11)
3 Definitions, symbols and abbreviations
3.1 Definitions

For the purposes of the present document, the terms and definitions given in EN 301 126-2-1 [2] apply.

3.2 Symbols

For the purposes of the present document, the symbols given in EN 301 126-2-1 [2] apply.

3.3 Abbreviations

For the purposes of the present document, the abbreviations given in EN 301 126-2-1 [2] apply.

4 General characteristics

Where necessary, for better understanding of the application of test methods, reference is made to EN 60835-1 [5]

(Test methods).
General remark:

Where systems transmitting more than one carrier over the same Tx (Multi carrier TDMA system) all carriers being

modulated according to the relevant standard, have to be tested applying for each carrier the test procedures defined for

a single carrier solution where not otherwise stated in the relevant EN/ETS.
ETSI
---------------------- Page: 9 ----------------------
SIST EN 301 126-2-3 V1.2.1:2006
8 ETSI EN 301 126-2-3 V1.2.1 (2004-11)
4.1 Equipment configuration
T E
T S
T E
T S
T E
T S
CCS
CRS
T S
Network Node
R S
T E
T S
Another CRS may be
connected to the same CCS
T E
T E
directional antenna
Baseband interface reference points F/G
Omnidirectional
or sector antenna
Figure 1: General system architecture
E A TRANSMIT B C D
MODULATOR TRANSMITTER BRANCHING FEEDER
RF FILTER
(see note)
Z E A RECEIVE B C D
BRANCHING FEEDER
DEMODULATOR RECEIVER
RF FILTER
(see note)
NOTE: No filtering included.
Figure 2: RF System Block diagram
ETSI
---------------------- Page: 10 ----------------------
SIST EN 301 126-2-3 V1.2.1:2006
9 ETSI EN 301 126-2-3 V1.2.1 (2004-11)
4.1.1 System configuration

P-MP equipment is designed to operate as an access system connected to a network node (e.g. local switch) and user

terminal equipment (figure 1). The individual conformance tests are made in a single link direction (figure 2) but for

certain tests, e.g. for equipment to set up signalling, both forward and reverse links have to operate, the minimum

equipment arrangement for tests with only one subscriber is shown in figure 3, where the forward and return RF paths

are separated by a pair of duplexers and separate attenuators are inserted in each path. In the absence of any more

specific instructions from the supplier it is suggested that the links are operated at threshold (RSL) + n dB where n is

half of the link dynamic range except when the receiver is being tested. The other receiver(s) should continue to be

operated at threshold (RSL) + n dB.

Calibrated splitters or directional couplers will be inserted at points A, B, C and D (figures 3 and 4) as required for the

individual tests, either to provide test points or sources of interfering signals.

OMC
CRS transmit path
A B
Attenuator
Interface
Duplexer
CRS Duplexer TS
unit
Attenuator
C D
TS transmit path
Bit Pattern Generators,
bit error rate testers, call
generators, etc. as required Bit Pattern Generators,
bit error rate testers, call
generators, etc. as required
NOTE: TDD systems may only require a single path with one attenuator.
Figure 3: Test configuration for a single Terminal Station

NOTE 1: Calibrated splitters or directional couplers will be inserted at points A, B, C and D as required for the

individual tests, either as test points or as sources of interfering signals.

NOTE 2: When measuring the TS transmitter to demonstrate that it meets the emission mask and spurious

emissions limits, the splitter network will have only one TS connected and this network may be removed.

NOTE 3: The P-MP systems to be tested are duplex systems and features such as time/frequency synchronization

and ATPC require both paths to be functioning correctly. To ensure that the results of measurements on

either the forward or return paths, e.g. receiver RSL, are not influenced by conditions in the other path it

may be necessary to provide lower attenuation, or raise the transmitter power, in this other path. In the

absence of any more specific instructions from the supplier it is suggested that this other path is operated

at threshold (RSL) + n dB.

All the test procedures, presented in the following clauses, shall apply to both CRS(s) and TS(s). Unless otherwise

stated, all Essential Requirements (ER) tests shall be undertaken at the nominal and extremes of power supply and

environmental parameters and at maximum output power. RF power, spectrum and frequency measurements shall be

undertaken at low, medium and high frequencies within the declared range of frequencies. These RF frequencies may

be selected by remote control or otherwise.
ETSI
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SIST EN 301 126-2-3 V1.2.1:2006
10 ETSI EN 301 126-2-3 V1.2.1 (2004-11)

Central or remote stations incorporating integral antennas shall be provided with an appropriate coaxial or waveguide

transition by the supplier in order to facilitate the measurements described.

For tests where the simultaneous use of several TSs is necessary, then an arrangement similar to that shown in figure 4

is required. To enable communication, the traffic load may be simulated and facilities such as remote loop back may be

used to route traffic through the system.

This arrangement ensures that the system operates in a normal manner similar to its configuration for measurements

such as transmitter mask and RSL.
TS
CRS transmit path
TS
(see note)
A B
Attenuator
Interface
CRS
Enable
unit
communications
Attenuator
C D
TS transmit path
Bit Pattern Generators,
(see note)
bit error rate testers,
call generators etc. as
required
Bit Pattern Generators, bit
error rate testers,
call generators etc.
as required
NOTE: TDD systems may only require a single path with one attenuator.
Figure 4: Test Configuration for multiple Terminal Stations
4.2 Transmitter characteristics
4.2.1 Maximum RF output power
Objective:

Verify that the highest average RF output power measured during a transmission burst at reference point B'or C'

(figure 5) is within the supplier's declared value, plus/minus the EN/ETS tolerance, and does not exceed the EN/ETS

maximum value. For the CRS this may be done using a power meter with all time slots transmitting at maximum power.

For the TS this may be done by synchronizing the power measurement with the active burst(s) or correcting the power

with a correction due to the on/off duty cycle.
Test instruments:
Average Power Meter with a time gating function or an appropriate alternate.
ETSI
Duplexer
Duplexer
N way splitter network including attenuator
etc. if required for isolation between TSs
---------------------- Page: 12 ----------------------
SIST EN 301 126-2-3 V1.2.1:2006
11 ETSI EN 301 126-2-3 V1.2.1 (2004-11)
Test Configuration:
Transmit
Z E A B(C) Atten /
Modulator Transmitter RF filter Power meter
coupler
(branching)
Figure 5: Test configuration for maximum RF output power
Test Procedure:

With the transmitter power level set to maximum, including ATPC/RTPC, etc, the maximum output power of the

transmitter at point B (C) during the worst case, as declared by the supplier, of the modulated transmission burst is

measured. To make this measurement an average power meter with a time gating function or an appropriate alternate

shall be used. All systems should be tested at 3 frequencies: top, middle and bottom frequencies of the available range.

A power splitter or coupler may be required if the TS requires an RF link from the CRS before it can operate.

4.2.2 Minimum RF output power (if applicable)
Objective:

Verify that the minimum RF output power measured at reference point B' or C' of equipment which is fitted with a

power control facility is within the specified limit of the declared value.
Test Instruments:
Average Power Meter with a time gating function or an appropriate alternate.
Test Configuration:
As for maximum power test.
Test Procedure:

With the transmitter power level set to minimum the transmitter output at B (C) is to be measured. All systems should

be tested at 3 frequencies: top, middle and bottom frequencies of the available range.

4.2.3 Automatic Transmit Power Control (ATPC)

ATPC is an optional feature. However, when fitted and required by the standard, the minimum and maximum output

power levels shall be checked. In addition, satisfactory operation of the automatic facility shall be demonstrated.

Objective:

When ATPC is implemented, the control loop is to be checked for satisfactory operation i.e.: Tx output power is related

to the input level at the far end receiver.
Test Instruments:
As for maximum power test.
Test Configuration:
To be declared by the supplier.
Test Procedure:

Throughout the transmitter's selected power range, the receiver input level is to be maintained within the limits stated in

the relevant EN/ETS or in supplier's guaranteed operating criteria. The test is to be repeated to verify that the automatic

power control performance, between maximum selected transmitter power and minimum transmitter power meets the

EN/ETS or supplier's performance limits.
ETSI
---------------------- Page: 13 ----------------------
SIST EN 301 126-2-3 V1.2.1:2006
12 ETSI EN 301 126-2-3 V1.2.1 (2004-11)
4.2.4 Remote Transmit Power Control (RTPC)

Where remote transmit power control option is fitted, it may be checked and recorded during the transmitter output

power test. The maximum power shall not exceed that applied in clause 4.2.1 as an essential requirement.

4.2.5 Frequency accuracy
Objective:

To verify that the Tx output frequency is within the limits specified in the relevant EN/ETS.

NOTE 1: For systems that do not shut down on loss of synchronization, frequency accuracy should also be

measured in the non-synchronized condition.
Test Instruments:
either:
1) Frequency Counter capable of measuring modulated signals;

2) Spectrum Analyser with an accurate frequency reference (recommended two orders of magnitude greater than

the allowed limit), internal or external.
Test Configuration:
Freq.counter
Transmit
Atten
Z E A B(C)
or Spectrum
Modulator Transmitter RF filter
Analyser.
(branching)
Figure 6: Test configuration for frequency accuracy
Test Procedure:

The Tx is to be operated in the normal operating modulated condition and frequency measurements conducted on each

of the three selected frequencies (high, medium, low) through the remote frequency control, if fitted. The measured

frequency is to be within the supplier's stated operating range. A power splitter or coupler may be required if the TS

requires an RF link from the CRS before it can operate.

Using appropriately gated frequency counter or the spectrum analyser, the CW signal or the carrier breakthrough shall

be measured.

If adequate measurement stability cannot be achieved by this method, then the supplier shall make available an

appropriate method to place the transmitter in a mode that allows the frequency of the carrier or a pair of sidebands to

be measured.

NOTE 2: For systems that do not shut down on loss of synchronization, frequency accuracy should also be

measured in the non-synchronized condition.
4.2.6 RF spectrum mask

RF spectrum mask measurements are to be conducted at the lowest, mid-band and highest channel of the unit under test.

Objective:

To verify that the output spectrum is within the specified limits of the relevant EN/ETS.

Test Instruments:
1) Spectrum Analyser;
2) Plotter.
ETSI
---------------------- Page: 14 ----------------------
SIST EN 301 126-2-3 V1.2.1:2006
13 ETSI EN 301 126-2-3 V1.2.1 (2004-11)
Test Configuration:
Transmit Spectrum
Z E A B(C) Atten
RF filter Analyser
Modulator Transmitter
(branching) and plotter
Figure 7: Test configuration for Spectrum Mask
Test Procedure:

The transmitter output port shall be connected to either a Spectrum Analyser via an attenuator or an artificial load with

some means of monitoring the emissions with a Spectrum Analyser. The Spectrum Analyser shall have a variable

persistence display or a digital storage facility. When not stated in the relevant EN/ETS, the resolution bandwidth,

frequency span, scan time and video filter settings of the Spectrum Analyser are to be set in accordance with the

following indications. A power splitter or coupler may be required if the TS requires an RF link from the CRS before it

can operate.

Table 1: Spectrum Analyser Settings for RF Power Spectrum Measurement for CRS only

RF channel spacing (MHz) < 1,75 1,75 to 20 > 20
Centre frequency actual actual Actual
Sweep width (MHz)
Note 1 Note 1 Note 1
Scan time
auto auto Auto
IF bandwidth (kHz) 30 30 100
Video bandwidth (kHz) 0,1 0,3 0,3
See note 2 for TS settings.
NOTE 1: 5 × channel spacing < sweep width < 7× channel spacing.

NOTE 2: The spectrum analyser settings for RF power Spectrum Measurement for TDMA Terminal Stations (TS)

are depending on the burst duration. For a burst duration of ≈50 µs, the recommended settings are IF

bandwidth ≈30 kHz and video bandwidth ≈10 kHz.
For other pulse durations, the recommended settings are as following:
- IF bandwidth ≈ 30 kHz × 50µs/ (pulse duration in µs);
- Video bandwidth ≈ 10 kHz × 50µs/ (pulse duration in µs);
- The supplier has to declare the settings.

NOTE 3: For TDMA/OFDMA Terminal Stations (TS), for this test, the TSs should be modulated with the

maximum number of sub-carriers supported. The manufacturer shall declare the worst-case configuration

and have available supporting evidence. Typically this will include the highest and lowest sub-carrier

frequencies.

With the transmitter modulated by a signal having the characteristics given in the relevant EN/ETS, the transmitter

power density, (including the spectral lines at the symbol rate if stated in the EN/ETS), shall be measured by the

Spectrum Analyser and recorded. Where possible, transmitter spectral power density plots at the lowest, mid-band and

highest frequencies of the supplier's declared operating range are to be recorded.

4.2.7 Remote Frequency Control

Remote frequency control is an optional feature. However, when fitted the function shall be tested during the frequency

accuracy test. If necessary, repeat test as in clause 4.2.5 with frequency settings controlled using the remote frequency

control option.
4.2.8 Spectral lines at the symbol rate

The test for spectral lines at the symbol rate is performed at the same time as the RF spectrum mask, see clause 4.2.6 if

applicable to the standard.
ETSI
---------------------- Page: 15 ----------------------
SIST EN 301 126-2-3 V1.2.1
...

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