ETSI
ETSI EN 300 328 V2.1.1 (2016
In order for the equipment to comply with the Frequency Occupation requirement, it shall meet either of the following
two options:
Option 1: Each hopping frequency of the hopping sequence shall be occupied at least once within a period
not exceeding four times the product of the dwell time and the number of hopping frequencies in
use.
Option 2: The occupation probability for each frequency shall be between ((1 / U) × 25 %) and 77 % where
U is the number of hopping frequencies in use.
The hopping sequence(s) shall contain at least N hopping frequencies where N is either 5 or the result of 15 MHz
divided by the minimum Hopping Frequency Separation in MHz, whichever is the greater. According to
clause 4.3.1.5.3.1 the minimum Hopping Frequency Separation for non-adaptive equipment is equal to the Occupied
Channel Bandwidth with a minimum of 100 kHz.
4.3.1.4.3.2 Adaptive frequency hopping equipment
Adaptive Frequency Hopping equipment shall be capable of operating over a minimum of 70 % of the band specified in
table 1.
The Accumulated Transmit Time on any hopping frequency shall not be greater than 400 ms within any observation
period of 400 ms multiplied by the minimum number of hopping frequencies (N) that have to be used.
In order for the equipment to comply with the Frequency Occupation requirement, it shall meet either of the following
two options:
Option 1: Each hopping frequency of the hopping sequence shall be occupied at least once within a period
not exceeding four times the product of the dwell time and the number of hopping frequencies in
use.
Option 2: The occupation probability for each frequency shall be between ((1 / U) × 25 %) and 77 % where
U is the number of hopping frequencies in use.
The hopping sequence(s) shall contain at least N hopping frequencies at all times, where N is either 15 or the result of
15 MHz divided by the minimum Hopping Frequency Separation in MHz, whichever is the greater.
4.3.1.4.4 Other Requirements
For non-Adaptive Frequency Hopping equipment, from the N hopping frequencies defined in clause 4.3.1.4.3.1 above,
the equipment shall transmit on at least one hopping frequency while other hopping frequencies are blacklisted.
For equipment that blacklists one or more hopping frequencies, these blacklisted frequencies are considered as active
transmitting for the calculation of the MU factor of the equipment. See also clause 5.4.2.2.1.3, step 4, first bullet item
and clause 5.4.2.2.1.4, step 3, first bullet item, second paragraph.
For Adaptive Frequency Hopping equipment, from the N hopping frequencies defined in clause 4.3.1.4.3.2 above, the
equipment shall consider at least one hopping frequency for its transmissions. Providing that there is no interference
present on this hopping frequency with a level above the detection threshold defined in clause 4.3.1.7.2.2, point 5 or
clause 4.3.1.7.3.2, point 5, then the equipment shall have transmissions on this hopping frequency.
For non-Adaptive Frequency Hopping equipment, when not transmitting on a hopping frequency, the equipment has to
occupy that frequency for the duration of the typical dwell time (see also definition for blacklisted frequency in
clause 3.1).
For Adaptive Frequency Hopping equipment using LBT based DAA, if a signal is detected during the CCA, the
equipment may jump immediately to the next frequency in the hopping sequence (see clause 4.3.1.7.2.2, point 2)
provided the limit for maximum dwell time is respected.
4.3.1.4.5 Conformance
The conformance tests for this requirement are defined in clause 5.4.4. Alternatively, for demonstrating compliance
with the Accumulated Transmit Time requirement, the manufacturer may provide a statistical analysis to demonstrate
that the requirement can be met with a probability of 95 %. See clause 5.4.1.