Specifications

ETSI
Final draft ETSI
EN 300 328 V1.8.1 (2012
-
04)
47
• Using the procedure defined in clause 5.3.7.2.1.4, it shall be verified that:
i) The UUT shall stop transmissions on the hopping frequency being tested.
NOTE 2: The UUT is assumed to stop transmissions on this hopping frequency within a period equal to the
maximum Channel Occupancy Time defined in clauses 4.3.1.6.1 or 4.3.1.6.2. As stated in
clause 4.3.1.6.2.2, the Channel Occupancy Time for non-LBT based frequency hopping systems may be
non-contiguous.
ii) For LBT based frequency hopping equipment, apart from Short Control Signalling Transmissions (see
iii) below), there shall be no subsequent transmissions on this hopping frequency, as long as the
interference signal remains present.
For non-LBT based frequency hopping equipment, apart from Short Control Signalling Transmissions
(see iii) below), there shall be no subsequent transmissions on this hopping frequency for a (silent)
period defined in clause 4.3.1.6.2.2 step 3. After that, the UUT may have normal transmissions again for
the duration of a single Channel Occupancy Time period (which may be non-contiguous). Because the
interference signal is still present, another silent period as defined in clause 4.3.1.6.2.2 step 3 needs to be
included. This sequence is repeated as long as the interfering signal is present.
NOTE 3: In case of overlapping channels, transmissions in adjacent channels may generate transmission bursts on
the channel being investigated, however they will have a lower amplitude as on-channel transmissions.
Care should be taken to only evaluate the on-channel transmissions. The Time Domain Power Option of
the analyser may be used to measure the RMS power of the individual bursts to distinguish on-channel
transmissions from transmissions on adjacent channels. In some cases, the RBW may need to be reduced.
iii) The UUT may continue to have Short Control Signalling Transmissions on the hopping frequency being
tested while the interference signal is present. These transmissions shall comply with the limits defined
in clause 4.3.1.6.3.2.
NOTE 4: 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 3 of clause 4.3.1.10.2.
• Repeat step 4 to verify that the UUT does not resume any normal transmissions on the hopping frequency
being investigated.
Step 6: Removing the interference and blocking signal
• On removal of the interference and blocking signal, the UUT is allowed to re-include any channel previously
marked as unavailable; however, for non-LBT based systems, it shall be verified that this shall only be done
after the period defined in clause 4.3.1.6.2.2 point 3.
Step 7:
• The steps 2 to 6 shall be repeated for each of the hopping frequencies to be tested.
5.3.7.2.1.2 Non-LBT based adaptive equipment using modulations other than FHSS
The different steps below define the procedure to verify the efficiency of the non-LBT based DAA adaptive mechanism
of equipment using wide band modulations other than FHSS.
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.