Base-Station-Conformance-Testing
Technical Specification C W T S
Contents
INTE LLE CTUAL PROPE RTY RIGHTS (7)
FORE WORD (7)
1 SCOPE (8)
2 RE FE RE NCE S (8)
3 DE FINITIONS, SYMBOLS, AND ABBRE VIATIONS (8)
3.1 D EFINITIONS (8)
3.2 S YMBOLS (8)
3.3 A BBREVIATIONS (9)
4 FRE QUE NCY BANDS AND CHANNE L ARRANGE ME NT (10)
4.1 G ENERAL (10)
4.2 F REQUENCY BANDS (10)
4.3 TX–RX FREQUENCY SEPARATION (10)
4.4 C HANNEL ARRANGEMENT (10)
4.4.1 Channel spacing (10)
4.4.2 Channel raster (10)
4.4.3 Channel number (10)
5 GE NE RAL TE ST CONDITIONS AND DE CLARATIONS (11)
5.1 B ASE STATION CLASSES (11)
5.2 O UTPUT POWER AND DETERMINATION OF POWER CLASS (11)
5.3 S PECIFIED FREQUENCY RANGE (11)
5.4 T EST ENVIRONMENTS (11)
5.4.1 Normal test environment (11)
5.4.2 Extreme test environment (12)
5.4.2.1 Extreme temperature (12)
5.4.3 Vibration (13)
5.4.4 Power supply (13)
5.4.5 Acceptable uncertainty of measurement equipment (13)
5.5 I NTERPRETATION OF MEASUREMENT RESULTS (17)
5.6 S ELECTION OF CONFIGURATIONS FOR TESTING (17)
5.7 BTS C ONFIGURATIONS (17)
5.7.1 Receiver diversity (18)
5.7.2 Duplexers (18)
5.7.3 Power supply options (18)
5.7.4 Ancillary RF amplifiers (18)
5.7.5 BSS using Smart antenna (19)
5.8 O VERVIEW OF THE CONFORMANCE TEST REQUIREMENTS (20)
5.9 F ORMAT AND INTERPRETATION OF TESTS (21)
6 TRANSMITTE R CHARACTERISTICS (22)
6.1 G ENERAL (22)
6.2 M AXIMUM OUTPUT POWER (22)
6.2.1 Definition and applicability (22)
6.2.2 Conformance requirements (22)
6.2.3 Test purpose (22)
6.2.4 Method of test (23)
6.2.4.2 Procedure (23)
6.2.5 Test requirements (23)
6.3 F REQUENCY STABILITY (23)
6.3.1 Definition and applicability (23)
6.3.2 Conformance requirements (23)
6.3.3 Test purpose (23)
6.3.4 Method of test (23)
6.3.4.1 Initial conditions (23)
6.3.4.2 Procedure (24)
6.3.5 Test requirements (24)
6.4 O UTPUT POWER DYNAMICS (24)
6.4.1 Closed loop power control (24)
6.4.2 Power control steps (24)
6.4.2.1 Definition and applicability (24)
6.4.2.2 Conformance requirements (24)
6.4.2.3 Test purpose (24)
6.4.2.4 Method of test (24)
6.4.2.4.1 Initial conditions (24)
6.4.2.4.2 Procedure (25)
6.4.2.5 Test requirements (25)
6.4.3 Power control dynamic range (25)
6.4.3.1 Definition and applicability (25)
6.4.3.2 Conformance requirements (25)
6.4.3.3 Test purpose (25)
6.4.3.4 Method of test (25)
6.4.3.4.1 Initial conditions (25)
6.4.3.4.2 Procedure (25)
6.4.3.5 Test requirements (25)
6.4.4 Minimum transmit power (25)
6.4.4.1 Definition and applicability (25)
6.4.4.2 Conformance requirements (26)
6.4.4.3 Test purpose (26)
6.4.4.4 Method of test (26)
6.4.4.4.1 Initial conditions (26)
6.4.4.4.2 Procedure (26)
6.4.4.5 Test requirements (26)
6.4.5 Total power dynamic range (26)
6.4.5.1 Test purpose (26)
6.4.5.2 Test case (26)
6.4.5.3 Conformance requirements (26)
6.4.6 Power control cycles per second (26)
6.4.6.1 Test purpose (26)
6.4.6.2 Test case (27)
6.4.6.3 Conformance requirements (27)
6.5 T RANSMIT OFF POWER (27)
6.5.1 Definition and applicability (27)
6.5.2 Conformance requirements (27)
6.5.3 Test purpose (27)
6.5.4 Method of test (27)
6.5.4.1 Initial conditions (27)
6.5.4.2 Procedure (27)
6.5.5 Test requirements (27)
6.6 O UTPUT RF SPECTRUM EMISSIONS (28)
6.6.1 Occupied bandwidth (28)
6.6.1.1 Test purpose (28)
6.6.1.2 Test case (28)
6.6.1.3 Conformance requirements (28)
6.6.2.1 Spectrum emission mask (28)
6.6.2.1.1 Test purpose (28)
6.6.2.1.2 Test case (28)
6.6.2.1.3 Conformance requirements (28)
6.6.2.2 Adjacent Channel Leakage power Ratio (ACLR) (28)
6.6.2.2.1 Test purpose (29)
6.6.2.2.2 Test case (29)
6.6.2.2.3 Conformance requirements (29)
6.6.2.3 Protection outside a licensee's frequency block (29)
6.6.2.3.1 Test purpose (29)
6.6.2.3.2 Test case (29)
6.6.2.3.3 Conformance requirements (29)
6.6.3 Spurious emissions (29)
6.6.3.1 Mandatory Requirements (30)
6.6.3.1.1 Test purpose (30)
6.6.3.1.2 Test case (30)
6.6.3.1.3 Conformance requirements (30)
6.6.3.1.3.1 Spurious emissions (Category A) (30)
6.6.3.1.3.2 Spurious emissions (Category B) .................................................. 错误！未定义书签。
6.6.3.2 Co-existence with GSM 900 (30)
6.6.3.2.1 Operation in the same geographic area (30)
6.6.3.2.1.1 Test purpose (30)
6.6.3.2.1.2 Test case (30)
6.6.3.2.1.3. Conformance (30)
6.6.3.2.2. Co-located base stations (31)
6.6.3.2.2.1. Test purpose (31)
6.6.3.2.2.2 Test case (31)
6.6.3.2.2.3 Conformance requirements (31)
6.6.3.3 Co-existence with DCS 1800 (31)
6.6.3.3.1 Operation in the same geographic area (31)
6.6.3.3.1.1 Test purpose (31)
6.6.3.3.1.2 Test case (31)
6.6.3.3.1.3 Conformance (31)
6.6.3.3.2 Co-located base stations (31)
6.6.3.3.2.1 Test purpose (31)
6.6.3.3.2.2 Test case (31)
6.6.3.3.2.3 Conformance requirements (32)
6.7 T RANSMIT INTERMODULAT ION (32)
6.7.1 Test purpose (32)
6.7.2 Test case (32)
6.7.3 Conformance requirements (32)
6.8 T RANSMIT M ODULATION (32)
6.8.1 Transmit pulse shape filter (32)
6.8.2 Modulation accuracy (32)
6.8.2.1 Test purpose (33)
6.8.2.2 Test case (33)
6.8.2.3 Conformance requirements (33)
6.8.3 Peak Code Domain Error (33)
6.8.3.1 Test purpose (33)
6.8.3.2 Test case (33)
6.8.3.3 Conformance requirements (33)
7 RE CE IVE R CHARACTE RISTICS (34)
7.1 G ENERAL (34)
7.2 R EFERENCE SENSITIVITY LEVEL (34)
7.2.1 Minimum requirement (34)
7.2.1.1 Test purpose (34)
7.2.1.3 Conformance requirements (34)
7.2.2 Maximum frequency deviation for receiver performance (35)
7.2.2.1 Test purpose (35)
7.2.2.2 Test case (35)
7.2.2.3 Conformance requirements (35)
7.3 D YNAMIC RANGE (35)
7.3.1 Test purpose (35)
7.3.2 Test case (35)
7.3.3 Conformance requirements (35)
7.4 A DJACENT C HANNEL S ELECTIVITY (ACS) (35)
7.4.1 Test purpose (35)
7.4.2 Test case (35)
7.4.3 Conformance Requirements (35)
7.5 B LOCKING CHARACTERIST ICS (36)
7.5.1 Test purpose (36)
7.5.2 Test case (36)
7.5.3 Conformance requirements (36)
7.6 I NTERMODULATION CHARACTERISTICS (36)
7.6.1 Test purpose (36)
7.6.2 Test case (36)
7.6.3 Conformance requirements (36)
7.7 S PURIOUS EMISSIONS (37)
7.7.1 Test purpose (37)
7.7.2 Test case (37)
7.7.3 Conformance requirements (37)
7.8 T IMING ADVANCE (TA) REQUIREMENTS (37)
7.8.1 Test purpose (37)
7.8.2 Test case (37)
7.8.3 Conformance requirements (37)
8 PE RFORMANCE RE QUIRE ME NTS (38)
8.1 G ENERAL (38)
8.2 D YNAMIC REFERENCE SENSITIVITY PERFORMANCE (38)
8.2.1 Performance in AWGN channel (38)
8.2.1.1 Single link performance (38)
8.2.1.1.1 Test purpose (38)
8.2.1.1.2 Test case (38)
8.2.1.1.3 Conformance requirements (38)
8.2.1.2 Multi link performance (38)
8.2.1.2.1 Test purpose (38)
8.2.1.2.2 Test case (38)
8.2.1.2.3 Conformance requirements (38)
8.2.2 Performance in multipath fading channels (38)
8.2.2.1 Single link performance (39)
8.2.2.1.1 Performance without TPC (39)
8.2.2.1.1.1 Test purpose (39)
8.2.2.1.1.2 Test case (39)
8.2.2.1.1.3 Conformance requirements (39)
8.2.2.1.2 Performance with TPC (39)
8.2.2.1.2.1 Test purpose (39)
8.2.2.1.2.2 Test case (39)
8.2.2.1.2.3 Conformance requirements (39)
8.2.2.2 Multi link performance (39)
8.2.2.2.1 Test purpose (39)
8.2.2.2.2 Test case (39)
8.2.2.2.3 Conformance requirements (39)
8.3 BS SYNCHRONISATION PERFORMANCE (39)
8.3.2 Test case (39)
8.3.3 Conformance requirements (39)
Annex A (normative): Global in-channel Tx test (40)
A.1 G ENERAL (40)
A.2 D EFINITION OF THE PROCESS (40)
A.2.1 Basic principle (40)
A.2.2 Output signal of the Tx under test (40)
A.2.3 Reference signal (40)
A.2.4 Provisions in case of multi code signals (41)
A.2.5 Classification of measurement results (41)
A.2.6 Process definition to achieve results of type 1 (41)
A.2.7 Process definition to achieve results of type 2 (42)
A.2.7.1 Error Vector Magnitude (42)
A.2.7.2 Peak Code Domain Power Error (43)
A.3 A PPLICATIONS (43)
HISTORY (45)
Intellectual Property Rights
Foreword
This Technical Specification has been produced by CWTS
The contents of the present document are subject to continuing work within the WG1 and may change following formal CWTS approval. Should the WG1 modify the contents of this TS, it will be re-released by the CWTS with an identifying change of release date and an increase in version number as follows:
Version x.y.z
where:
x the first digit:
1 presented to CWTS for information;
2 presented to CWTS for approval;
3 Indicates CWTS approved document under change control.
y the second digit is incremented for all changes of substance, i.e. technical enhan cements, corrections, updates, etc.
z the third digit is incremented when editorial only changes have been incorporated in the specification.
1 Scope
The present document specifies the Radio Frequency (RF) test methods and conformance requirements for TD-SCDMA Base Transceiver Stations (BTS) operating. These have been derived from, and are consistent with, the TD-SCDMA base station (BS) specifications defined in CWTS TS C402 [7].
In this TS, the reference point for RF connections (except for the measurement of mean transmitted RF carrier power) is the antenna connector, as defined by the manufacturer. This TS does not apply to repeaters or RF devices which may be connected to an antenna connector of a BTS.
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, edition number, version number, etc.) or non-specific.
?For a specific reference, subsequent revisions do not apply.
?For a non-specific reference, the latest version applies.
? A non-specific reference to an ETS shall also be taken to refer to later versions published as an EN with the same number.
[1] 3G TS 25.105: "BTS Radio Transmission and reception (TDD)".
[2] ETR 027: "Methods of measurement for mobile radio equipment".
[3] IEC 721: "Classification of environmental conditions"
[4] IEC 68-2: "Basic environmental testing procedures; Part 2: Tests"
[5] ETR 028: "Uncertainties in the measurement of mobile radio equipment characteristics"
[6]Recommendation ITU-R SM.329-7: "Spurious emissions"
[7]CWTS TS C402 (V2.0.0): BTS Radio transmission and reception
3 Definitions, symbols, and abbreviations
3.1 Definitions
For the purposes of the present document, the [following] terms and definitions [given in ... and the following] apply.
example: text used to clarify abstract rules by applying them literally.
3.2 Symbols
For the purposes of the present document, the following symbols apply:
3.3 Abbreviations
For the purposes of the present document, the following abbreviations apply:
4 Frequency bands and channel arrangement
4.1 General
The information presented in this section is based on a chip rate of 1.28 Mcps.
4.2 Frequency bands
TD-SCDMA is designed to operate in the following bands;unpaired frequncy band around 2GHz band, refer to [7] Other frequency band is available.
Deployment of TDD in paired frequency band is an open item.
Deployment in other frequency bands is not precluded.
4.3 TX–RX frequency separation
No TX-RX frequency separation is required as Time Division Duplex (TDD) is employed. Each TDMA frame consists of 7 timeslots where each timeslot can be allocated to either transmit or receive.
4.4 Channel arrangement
4.4.1 Channel spacing
The nominal channel spacing is 1.6 MHz, but this can be adjusted to optimize performance in a particular deployment scenario.
4.4.2 Channel raster
The channel raster is 200kHz, which means that the carrier frequency must be a multiple of 200 kHz.
4.4.3 Channel number
The carrier frequency is designated by the TD-SCDMA as absolute radio frequency channel number (RFCN).
5 General test conditions and declarations
The requirements of this clause apply to all tests in this TS, when applicable.
The general conditions during the tests should be according to the relevant parts of ETR 027 [2] (methods of measurement for mobile radio equipment) with the exceptions and additions defin ed in the individual tests.
Many of the tests in this TS measure a parameter relative to a value which is not fully specified in the TD-
SCDMA specifications. For these tests, the conformance requirement is determined relative to a nominal value specified by the manufacturer.
Certain functions of a BTS are optional in the TD-SCDMA specifications.
When specified in a test, the manufacturer shall declare the nominal value of a parameter, or whether an option is supported.
5.1 Base station classes
The requirements in this specification apply to base stations intended for general-purpose applications in co-ordinated network operation.
In future, further classes of base stations may be defined; the requirements for these may be different than for general-purpose applications.
5.2 Output power and determination of power class
The manufacturer shall declare the maximum output power of the base station which is defined as the mean power level per carrier at the antenna connector; see subclause 6.2.
5.3 Specified frequency range
The manufacturer shall declare:
- which of the frequency bands defined in sub-clause 4.2 is supported by the BSS.
- the frequency range within the above frequency band(s) supported by the BSS. The same frequency range is used for transmit and receive operation.
Many tests in this TS are performed with appropriate frequencies in the bottom, middle and top of the operating frequency band of the BTS. These are denoted as RF channels B (bottom), M (middle) and T (top).
When a test is performed by a test laboratory, the RFCNs to be used for RF channels B, M and T shall be specified by the laboratory. The laboratory may consult with operators, the manufacturer or other bodies.
When a test is performed by a manufacturer, the RFCNs to be used for RF channels B, M and T may be specified by an operator.
5.4 Test environments
For each test in this TS, the environmental conditions under which the BSS is to be tested are defined.
5.4.1 Normal test environment
When a normal test environment is specified for a test, the test should be performed under any combination of conditions between the minimum and maximum limits stated in table 5.4.1.1.
Table 5.4.1.1: Limits of conditions for Normal Test E nvironment
The ranges of barometric pressure, temperature and humidity represent the maximum variation expected in the uncontrolled environment of a test laboratory. If it is not possible to maintain these parameters within the specified limits, the actual values shall be recorded in the test report.
NOTE: This may, for instance, be the case for measurements of radiated emissions performed on an open field test site.
5.4.2 Extreme test environment
The manufacturer shall declare one of the following:
a) The equipment class for the equipment under test, as defined in ETS 300 019-1-3, (Equipment Engineering (EE);
Environmental conditions and environmental test for telecommunications equipment, Part 1-3: Classification of environmental conditions, Stationary use at weather protected locations).
b) The equipment class for the equipment under tes t, as defined in ETS 300 019-1-4, (Equipment Engineering (EE);
Environmental conditions and environmental test for telecommunications equipment, Part 1-4: Classification of environmental conditions, Stationary use at non-weather protected locations).
c) For equipment that does not comply to an ETS 300 019-1 [11] class, the relevant classes from IEC 721 [3]
documentation for Temperature, Humidity and Vibration shall be declared.
NOTE: Reduced functionality for conditions that fall out side of the standard operational conditions are not tested in this TS. These may be stated and tested separately.
5.4.2.1 Extreme temperature
When an extreme temperature test environment is specified for a test, the test shall be performed at the standard minimum and maximum operating temperatures defined by the manufacturer's declaration for the equipment under test. Minimum temperature:
The test shall be performed with the environmental test equipment and methods of inducing the required
environmental phenomena into the equipment, conforming to the test procedure of IEC 68-2-1 [4], Environmental Testing, Part 2: Tests - Tests A: Cold. The equipment shall be maintained at the stabilized condition for the
duration of the test sequence.
Maximum temperature:
The test shall be performed with the environmental test equipment and methods of inducing the required
environmental phenomena in to the equipment, conforming to the test procedure of IEC 68-2-2 [4] (Environmental Testing, Part 2: Tests - Tests Bd Dry heat). The equipment shall be maintained at the stabilized condition for the duration of the test sequence.
NOTE: It is recommended that the equipment is made fully operational prior to the equipment being taken to its lower operating temperature.
5.4.3 Vibration
When vibration conditions are specified for a test, the test shall be performed while the equipment is subjected to a vibration sequence as defined by the manufacturers declaration for the equipment under test. This shall use the environmental test equipment and methods of inducing the required environmental phenomena in to the equipment, conforming to the test procedure of IEC 68-2-6 [4], Environmental Testing, Part 2: Tests - Test Fc and guidance: Vibration (Sinusoidal). Other environmental conditions shall be within the ranges specified in subclause 5.4.1, Normal test environment.
NOTE: The higher levels of vibration may induce undue physical stress in to equipment after a prolonged series of tests. The testing body should only vibrate the equipment during the RF measurement process.
5.4.4 Power supply
When extreme power supply conditions are specified for a test, the test shall be performed at the standard upper and lower limits of operating voltage defined by the manufacturer's declaration for the equipment under test.
Upper voltage limit
The equipment shall be supplied with a voltage equal to the upper limit declared by the manufacturer (as measured at the input terminals to the equipment). The tests shall be carried out at a steady state minimum and maximum limit declared by the manufacturer for the equipment, to the methods described in IEC 68-2-1 [4] Test Ab/Ad: Cold and IEC 68-2-2 Test
Bb/Bd: Dry Heat.
Lower voltage limit
The equipment shall be supplied with a voltage equal to the lower limit declared by the manufacturer (as measured at the input terminals to the equipment). The tests shall be carried out at a steady state minimum and maximum limit declared by the manufacturer for the equipment, to the methods described in IEC 68-2-1 [4] Test Ab/Ad: Cold and IEC 68-2-2 [4] Test Bb/Bd: Dry Heat.
5.4.5 Acceptable uncertainty of measurement equipment
The maximum acceptable uncertainty of measurement equipment is specified separately for each test, where appropriate. The measurement equipment shall enable the stimulus signals in the test case to be adjusted to within the specified tolerance, and the conformance requirement to be measured with an uncertainty not exceeding the specified values. All tolerances and uncertainties are absolute values, unless otherwise stated.
Subclause 5.4, Test environments:
Pressure ± 5 kPa
Temperature ± 2 degrees
Relative Humidity ± 5 %
DC Voltage ± 1.0 %
AC Voltage ± 1.5 %
Vibration 10 %
Vibration frequency 0.1 Hz
The above values shall apply unless the test environment is controlled and the specification for the control of the test environment specifies the uncertainty for the parameter.
Transmitter
Subclause 6.2, Base station maximum output power:
Conformance requirement:
RF power, for static power step 0 ± 1.0 dB
Subclause 6.3, Base station output power:
Conformance requirement:
RF power ± 1.0 dB
Subclause 6.4, Frequency stability:
Conformance requirement:
Frequency ± 10 Hz
Subclause 6.5, Output power dynamics
Conformance requirement:
RF power, for static power steps (minimum and maximum Tx power) ± 1.0 dB
Relative RF Power ± 0.7 dB
Subclause 6.6, Transmit ON/OFF ratio:
Conformance requirement:
RF power difference
Power difference < 50 dB ± 0.7 dB
Power difference ≥ 50 dB ± 1.5 dB
Subclause 6.7, Output RF spectrum emissions
Conformance requirement:
RF power difference
Power difference < 50 dB ± 0.7 dB
Power difference ≥ 50 dB ± 1.5 dB
Relative RF power:
Table 5.4.5.1: Acceptable uncertainty of relative RF power measurements
Spurious emissions
RF power
- inside the BTS transmit band ± 1.5 dB
- outside the BTS transmit band:
f ≤ 2 GHz ± 1.5 dB
2 GHz < f ≤ 4 GHz ± 2.0 dB
f > 4 GHz ± 4.0 dB
Subclause 6.8, Transmit intermodulation:
Test case:
Relative RF power (of injected signal); ± 1.5 dB
Conformance requirement (outside RX band):
RF power; absolute limit values ± 1.5 dB
RF power, relative measurements ± 2.0 dB
Conformance requirement (inside RX band):
RF power; absolute limit values +4 dB -3 dB
NOTE: The positive limit for uncertainty is greater than the negative limit because the measurement result can be increased (but not decreased) due to intermodulation products within the measurement apparatus. Receiver
Where a measurement uncertainty of +5 dB -0 dB is specified for an input signal, the measured value of the input signal should be increased by an amount equal to the uncertainty with which it can be measured. This will ensure that the true value of the input signal is not below the specified nominal.
Subclause 7.2, Reference sensitivity level
Test case:
RF power ± 1.0 dB
Subclause 7.3, Dynamic range:
Test case:
RF power ± 1.5 dB
Relative RF power ± 3.0 dB
Subclause 7.4, Adjacent Channel Selectivity (ACS):
Test case:
RF power ± 1.5 dB
Relative RF power ± 3.0 dB
Subclause 7.5, Blocking characteristics:
Test case:
RF power, wanted signal ± 1.0 dB
RF power, interfering signal;
f ≤ 2 GHz ± 0.7 dB
2 GHz < f ≤ 4 GHz ± 1.5 dB
f > 4 GHz ± 3.0 dB
Subclause 7.6, Spurious response:
Test case:
RF power, wanted signal ± 1.0 dB
RF power, interfering signal;
f ≤ 2 GHz ± 0.7 dB
2 GHz < f ≤ 4 GHz ± 1.5 dB
f > 4 GHz ± 3.0 dB
Subclause 7.7, Intermodulation characteristics:
Test case:
RF power, wanted signal ± 1.0 dB
RF power, interfering signals ± 0.7 dB
Subclause 7.8, Spurious emissions:
Conformance requirement:
RF power;
f ≤ 2 GHz ± 1.5 dB
2 GHz < f ≤ 4 GHz ± 2.0 dB
f > 4 GHz ± 4.0 dB
5.5 Interpretation of measurement results
The requirements given in these specifications are absolute. Compliance with the requirement is determined by comparing the measured value with the specified limit, without making allowance for measurement uncertainty.
The measurement uncertainty for the measurement of each parameter shall be included in the test report.
The recorded value for the measurement uncertainty shall be, for each measurement, equal to or lower than the appropriate figure in subclause 5.4 of this TS.
NOTE: This procedure is recommended in ETR 028 [5].
If the measurement apparatus for a test is known to have a measurement uncertainty greater than that specified in subclause 5.4, it is still permitted to use this apparatus provided that an adjustment is made to the measured value as follows:
The adjustment is made by subtracting the modulus of the specified measurement uncertainty in subclause 4.7 from the measurement uncertainty of the apparatus. The measured value is then increased or decreased by the result of the subtraction, whichever is most unfavourable in relation to the limit.
5.6 Selection of configurations for testing
Most tests in this TS are only performed for a subset of the possible combinations of test conditions. For instance: - Not all TRXs in the configuration may be specified to be tested.
- Only one RF channel may be specified to be tested.
- Only one timeslot may be specified to be tested.
When a test is performed by a test laboratory, the choice of which combinations are to be tested shall be specified by the laboratory. The laboratory may consult with operators, the manufacturer or other bodies.
When a test is performed by a manufacturer, the choice of which combinations are to be tested may be specified by an operator.
5.7 BTS Configurations
This TS has been written to specify tests for the standard configurations of BTS which have been assumed in TD-SCDMA requirements specifications, in particularreference [7]. However, there are other configurations of BTS which comply with these specifications, but for which the application of these specifications is not fully defined. For some such configurations there may be alternate ways to apply the requirements of this specification to testing of the configuration, or some variation in the test method may be necessary. It may therefore be necessary for the parties to the testing to reach agreement over the method of testing in advance.
If the BSS is supplied in a number of different environmental enclosures or configurations, it may not be necessary to test RF parameters for each environmental configuration, provided that it can be demonstrated that the equipment has been tested at the worst internal environmental conditions.
Where alternative interpretations of this specification are possible for a BSS configuration under test, the interpretation which has been adopted in performing the test shall be recorded with the test results.
Where variation in the test method within this TS has been necessary to enable a BSS configuration to be tested, the variation in the test method which has been made in performing the test shall be recorded with the test results. Where possible, agreement should be reached in advance about the nature of such a variation with any party who will later receive the test results.
Possible interpretations of this TS for some common configurations are given in the following subclauses.
5.7.1 Receiver diversity
i) For the tests in clause 7 of this TS, the specified test signals may be applied to one receiver antenna connector,
with the remaining receiver antenna connectors being terminated with 50 ohms.
or
ii) For the tests in clause 7 of this TS, the specified test signals may be simultaneously applied to each of the receiver antenna connectors.
5.7.2 Duplexers
Due to TDD operation, there is no need to use a duplexer in the BSS.
5.7.3 Power supply options
If the BSS is supplied with a number of different power supply configurations, it may not be necessary to test RF parameters for each of the power supply options, provided that it can be demonstrated that the ra nge of conditions over which the equipment is tested is at least as great as the range of conditions due to any of the power supply configurations.
This applies particularly if a BSS contains a DC rail which can be supplied either externally or from an int ernal mains power supply. In this case, the conditions of extreme power supply for the mains power supply options can be tested by testing only the external DC supply option. The range of DC input voltages for the test should be sufficient to verify the performance with any of the power supplies, over its range of operating conditions within the BTS, including variation of mains input voltage, temperature and output current.
5.7.4 Ancillary RF amplifiers
Ancillary RF amplifier: a piece of equipment, which when connected by RF coaxial cables to the BTS, has the primary function to provide amplification between the transmit and/or receive antenna connector of
a BTS and an antenna without requiring any control signal to fulfil its amplifying function.
The requirements of this TS shall be met with the ancillary RF amplifier fitted. At tests according to clause 6 and 7 for TX and RX respectively, the ancillary amplifier is connected to the BTS by a connecting network (including any cable(s), attenuator(s), etc.) with applicable loss to make sure the appropriate operating conditions of the ancillary amplifier and the BTS. The applicable connecting network loss range is declared by the manufacturer. Other characteristics and the temperature dependence of the attenuation of the connecting network are neglected. The actual attenuation value of the connecting network is chosen for each test as one of the applicable extreme values. The lowest value is used unless otherwise stated.
Sufficient tests should be repeated with the ancillary amplifier fitted and, if it is optional, without the ancillary RF amplifier to verify that the BSS meets the requirements of this TS in both cases.
5.7.5 BSS using Smart antenna
A BSS may be configured with smart antenna. This subclause applies to a BSS which meets at least one of the following conditions:
- The transmitter output signals from one or more TRX appear at more than one antenna port, or - transmitters and receivers are connected to more than one antenna
If a BSS is used, in normal operation, in conjunction with an antenna system which contains filters or active elements which are necessary to meet the TD-SCDMA requirements, the tests of conformance may be performed on a system comprising the BSS together with these elements, supplied separately for the purposes of testing. In this case, it must be demonstrated that the performance of the configuration under test is representative of the system in normal operation, and the conformance assessment is only applicable when the BSS is used with the antenna system. For testing of conformance of such a BSS, the following procedure may be used: Receiver tests
For each test, the test signals applied to the receiver antenna connectors shall be such that the sum of the powers of the signals applied equals the power of the test signal(s) specified in the test. An example of a suitable test configuration is shown in figure 5.7.5.1.
RX antenna interface
Splitting
network
Test
input port
BSS
P i
P s = Sum(P i ) where
P s = required input power specified
Figure 5.7.5.1: Receiver test setup
For spurious emissions from the receiver antenna connector, the test may be p erformed separately for each receiver antenna connector. Transmitter tests
For each test, the conformance requirement shall be met by the sum of the signals emitted by each transmitter antenna connector. This may be assessed by separately measuring the signals emitted by each antenna connector and summing the results, or by combining the signals and performing a single measurement. The characteristics (e.g. amplitude and phase) of the combining network should be such that the power of the combined signal is maximised. An example of a suitable test configuration is shown in figure 5.7.5.2.
TX antenna interface
Combining network Test
output port
BSS
Figure 5.7.5.2: Transmitter test setup
For Intermodulation attenuation, the test may be performed separately for each transmitter antenna connector.
5.8 Overview of the conformance test requirements
Tables 5.8.2, 5.8.3 and 5.8.4 give an overview of the conformance test requirements for the transmitter, the receiver and system performance, respectively.
Table 5.8.2: Overview of the conformance tests requirements for the transmitter