Specifications

ETSI
Final draft ETSI EN 300 328 V1.8.1 (2012
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04)
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4.3.2.4.1 Definition
The Medium Utilisation (MU) factor is a measure to quantify the amount of resources (Power and Time) used by
non-adaptive equipment. The Medium Utilisation factor is defined by the formula:
MU = (P/100 mW) × DC
where: MU is Medium Utilisation.
P is the RF output power as defined in clause 4.3.2.1.1 expressed in mW.
DC is the Duty Cycle as defined in clause 4.3.2.3.1 expressed in %.
NOTE: The equipment may have dynamic behaviour with regard to duty cycle and corresponding power level.
See clause 5.3.1 i).
4.3.2.4.2 Limit
For non-adaptive equipment using wide band modulations other than FHSS, the maximum Medium Utilisation factor
shall be 10 %.
4.3.2.4.3 Conformance
The conformance tests for this requirement are (part of the procedure) defined in clause 5.3.2.
4.3.2.5 Adaptivity (adaptive equipment using modulations other than FHSS)
This requirement does not apply to non-adaptive equipment or adaptive equipment operating in a non-adaptive mode
providing the equipment complies with the requirements and/or restrictions applicable to non-adaptive equipment.
In addition, this requirement does not apply for equipment with a maximum declared RF Output power level of less
than 10 dBm e.i.r.p. or for equipment when operating in a mode where the RF Output power is less than 10 dBm e.i.r.p.
Adaptive equipment using modulations other than FHSS is allowed to operate in a non-adaptive mode providing it
complies with the requirements applicable to non-adaptive equipment.
An adaptive equipment using modulations other than FHSS is equipment that uses a mechanism by which it can adapt
to its environment by identifying other transmissions present within its Occupied Channel Bandwidth.
Adaptive equipment using modulations other than FHSS shall implement either of the Detect and Avoid mechanisms
provided in clauses 4.3.2.5.1 or 4.3.2.5.2.
Adaptive systems are allowed to switch dynamically between different adaptive modes.
4.3.2.5.1 Non-LBT based Detect and Avoid
4.3.2.5.1.1 Definition
Non-LBT based Detect and Avoid is a mechanism for equipment using wide band modulations other than FHSS and by
which a given channel is made 'unavailable' because interference was reported after the transmission in that channel.
4.3.2.5.1.2 Requirements & Limits
Equipment using a modulation other than FHSS and using the non-LBT based Detect and Avoid mechanism, shall
comply with the following minimum set of requirements:
1) During normal operation, the equipment shall evaluate the presence of a signal on its current operating channel. If
it is determined that a signal is present with a level above the detection threshold defined in 4). the channel shall
be marked as 'unavailable'.
2) The channel shall remain unavailable for a minimum time equal to 1 s after which the channel may be considered
again as an 'available' channel.