Specifications

ETSI

Final draft ETSI EN 300 328 V1.8.1 (2012

04)

NOTE 3: The verification of the Short Control Signalling transmissions may require the analyser settings to be

changed (e.g. sweep time).

iv) Alternatively, the equipment may switch to a non-adaptive mode.

Step 5: Adding the blocking signal

• With the interfering signal present, a 100 % duty cycle CW signal is inserted as the blocking signal. The

frequency and the level are provided in table 6 of clause 4.3.2.10.2.

• Repeat step 4 to verify that the UUT does not resume any normal transmissions.

Step 6: Removing the interference and blocking signal

• On removal of the interference and blocking signal the UUT is allowed to start transmissions again on this

channel however, it shall be verified that this shall only be done after the period defined in clause 4.3.2.5.1.2

step 2.

Step 7:

• The steps 2 to 6 shall be repeated for each of the frequencies to be tested.

5.3.7.2.1.3 LBT based adaptive equipment using modulations other than FHSS

The different steps below define the procedure to verify the efficiency of the LBT based adaptive mechanism of

equipment using wide band modulations other than FHSS. This method can be applied on Load Based Equipment and

Frame Based Equipment.

Step 1:

• The UUT may connect to a companion device during the test. The interference signal generator, the blocking

signal generator, the spectrum analyser, the UUT and the companion device are connected using a set-up

equivalent to the example given by figure 5 although the interference and blocking signal generator do not

generate any signals at this point in time. The spectrum analyser is used to monitor the transmissions of the

UUT in response to the interfering and the blocking signals.

• Adjust the received signal level (wanted signal from the companion device) at the UUT to the value defined in

table 6 (clause 4).

NOTE 1: Testing of Unidirectional equipment does not require a link to be established with a companion device.

• The analyzer shall be set as follows:

- RBW:

Occupied Channel Bandwidth (if the analyser does not support this setting, the

highest available setting shall be used)

- VBW: 3 × RBW (if the analyser does not support this setting, the highest available setting

shall be used)

- Detector Mode: RMS

- Centre Frequency: Equal to the centre frequency of the operating channel

- Span: 0 Hz

- Sweep time: > maximum Channel Occupancy Time

- Trace Mode: Clear Write

- Trigger Mode: Video

Step 2:

• Configure the UUT for normal transmissions with a sufficiently high payload to allow demonstration of

compliance of the adaptive mechanism on the channel being tested.