Specifications

ETSI

Final draft ETSI EN 300 328 V1.8.1 (2

012

04)

4) The equipment, upon correct reception of a packet which was intended for this equipment can skip CCA and

immediately (see note 2) proceed with the transmission of management and control frames (e.g. ACK and Block

ACK frames are allowed but data frames are not allowed). A consecutive sequence of transmissions by the

equipment without a new CCA shall not exceed the maximum channel occupancy time as defined in 3) above.

NOTE 2: For the purpose of multi-cast, the ACK transmissions (associated with the same data packet) of the

individual devices are allowed to take place in a sequence.

5) The energy detection threshold for the CCA shall be proportional to the transmit power of the transmitter: for a

20 dBm e.i.r.p. transmitter the CCA threshold level (TL) shall be equal or lower than -70 dBm/MHz at the input to

the receiver (assuming a 0 dBi receive antenna). For power levels below 20 dBm e.i.r.p., the CCA threshold level

may be relaxed to TL = -70 dBm/MHz + 20 - Pout e.i.r.p. (Pout in dBm).

4.3.2.5.2.3 Conformance

The conformance tests for this requirement are defined in clause 5.3.7 and more specifically in clause 5.3.7.2.1.3.

4.3.2.5.3 Short Control Signalling Transmissions

4.3.2.5.3.1 Definition

Short Control Signalling Transmissions are transmissions used by adaptive equipment to send control signals

(e.g. ACK/NACK signals, etc.) without sensing the operating channel for the presence of other signals.

NOTE: Adaptive equipment may or may not have Short Control Signalling Transmissions.

4.3.2.5.3.2 Limits

If implemented, Short Control Signalling Transmissions of adaptive equipment using wide band modulations other than

FHSS shall have a maximum duty cycle of 10 % within an observation period of 50 ms.

NOTE: Duty Cycle is defined in clause 4.3.2.3.1.

4.3.2.5.3.3 Conformance

The conformance tests for this requirement are defined in clause 5.3.7.2.1.3.

4.3.2.6 Occupied Channel Bandwidth

This requirement applies to all types of equipment using wide band modulations other than FHSS.

4.3.2.6.1 Definition

The Occupied Channel Bandwidth is the bandwidth that contains 99 % of the power of the signal.

4.3.2.6.2 Limits

The Occupied Channel Bandwidth shall fall completely within the band given in clause 1.

In addition, for non-adaptive systems using wide band modulations other than FHSS and with e.i.r.p greater than

10 dBm, the occupied channel bandwidth shall be less than 20 MHz.

4.3.2.6.3 Conformance

The conformance tests for this requirement are defined in clause 5.3.8.

4.3.2.7 Transmitter unwanted emissions in the out-of-band domain

This requirement applies to all types of equipment using wide band modulations other than FHSS.