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Hi All, The revised EN 301 893 for national voting has two options, A is revised from 1.7.2, B is from 1.7.1 Load Based Equipment
Load based Equipment may implement an LBT based spectrum sharing mechanism based on the Clear Channel Assessment (CCA) mode using "energy detect", as described in IEEE 802.11™-2012 [8], clause 9, clause 10, clause 18 and clause 20 or as
described in IEEE 802.11ac™-2013 [9], clause 8, clause 9, clause 10 and clause 22, providing these devices comply with the conformance requirements referred to in clause 4.8.4. Load Based Equipment not using any of the mechanisms referenced above shall comply with the minimum set of requirements contained in either option A or option B below. When selecting option B, the value of
q shall be declared by the manufacturer. See clause 5.3.1 q). Option A 1)
Before a transmission or a burst of transmissions on an
Operating Channel, the equipment shall perform a Clear Channel Assessment (CCA) check using "energy detect". The equipment shall observe the
Operating Channel(s) for the duration of the CCA observation time which shall be not less than 20 µs. The
Operating Channel shall be considered occupied if the energy level in the channel exceeds the threshold corresponding to the power level given in point 5) below. If the equipment finds the channel to be clear, it may transmit immediately (see point 3)
below). 1)
If the equipment finds an Operating Channel occupied, it shall not transmit in that channel (see paragraphs below). The equipment shall perform an
Extended CCA check in which the Operating Channel is observed for the duration of an observation period of
q Observation Slots. An Observation Slot is either an Unoccupied Idle Slot of 18
µs (ECCA slot time) or a Busy Slot. A Busy Slot is the total time the
Operating Channel was found occupied in between two unoccupied ECCA slots and which shall be considered as a single Observation Slot. The initial value of q is 16 and shall be doubled for every new
Extended CCA check that has to be performed because the previous one failed to find N unoccupied ECCA slots. Once q has reached a value of 1 024 and the
Extended CCA check still failed to find N unoccupied ECCA slots, the value of q may be reset to the initial value of 16 for the start of the next
Extended CCA check. The value of N shall be randomly selected in the range 1 to q every time an
Extended CCA is required. If an Extended CCA check has found N unoccupied ECCA slots, the equipment may resume transmissions on this channel and the value of q shall be reset to its initial value. The equipment is allowed to continue Short Control Signalling Transmissions on this channel providing it complies with the requirements in clause 4.8.3.3. For equipment having simultaneous transmissions on multiple (adjacent or non-adjacent) operating channels, the equipment is allowed to continue transmissions on other
Operating Channels providing the CCA check did not detect any signals on those channels. NOTE 1: The total Idle Period is equal to the total of any CCA (initial or extended) checks which have been performed since the last transmission. 2)
The total time that an equipment makes use of an
Operating Channel is the Maximum Channel Occupancy Time which shall be less than 10 ms, after which the device shall perform a new Extended CCA as described in point 2) above. 3)
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). A consecutive sequence of transmissions by the equipment, without it performing a new CCA, shall not exceed the
Maximum Channel Occupancy Time as defined in point 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 4)
For transmit power levels of 23 dBm e.i.r.p. or above, the CCA threshold level (TL), at the input to the receiver, shall be ‑73 dBm/MHz assuming a 0 dBi receive antenna.
For transmit power levels below 23 dBm e.i.r.p., the CCA threshold level (TL), at the input of the receiver, shall be proportional to the maximum transmit power (PH)
according to the formula which assumes a 0 dBi receive antenna and PH to be specified in dBm e.i.r.p. TL = -73 dBm / MHz + (23 dBm - PH) / (1 MHz) Option B 1)
Before a transmission or a burst of transmissions on an
Operating Channel, the equipment shall perform a Clear Channel Assessment (CCA) check using "energy detect". The equipment shall observe the
Operating Channel(s) for the duration of the CCA observation time which shall be not less than 20 µs. The CCA observation time used by the equipment shall be declared by the manufacturer. The
Operating Channel shall be considered occupied if the energy level in the channel exceeds the threshold corresponding to the power level given in point 5) below. If the equipment finds the channel to be clear, it may transmit immediately (see point 3)
below). 2)
If the equipment finds an Operating Channel occupied, it shall not transmit in that channel. The equipment shall perform an
Extended CCA check in which the Operating Channel is observed for the duration (observation period) of a random factor N multiplied by the CCA observation time. N defines the number of unoccupied idle slots resulting in a total
Idle Period that needs to be observed before initiation of the transmission. The value of N shall be randomly selected in the range 1 to q every time an
Extended CCA is required and the value stored in a counter. The value of q is selected by the manufacturer in the range 4 to 32. This selected value shall be declared by the manufacturer (see clause 5.3.1 q)). The counter is decremented every time a
CCA slot is considered to be "unoccupied". When the counter reaches zero, the equipment may transmit. The equipment is allowed to continue Short Control Signalling Transmissions on this channel providing it complies with the requirements in clause 4.8.3.3. For equipment having simultaneous transmissions on multiple (adjacent or non-adjacent) operating channels, the equipment is allowed to continue transmissions on other
Operating Channels providing the CCA check did not detect any signals on those channels. 3)
The total time that an equipment makes use of an
Operating Channel is the Maximum Channel Occupancy Time which shall be less than (13 / 32) × q ms, with q as defined in point 2) above, after which the device shall perform the
Extended CCA described in point 2) above. 4)
The equipment, upon correct reception of a packet which was intended for this equipment, can skip CCA and immediately (see note 3) proceed with the transmission of management and control frames (e.g. ACK and
Block ACK frames). A consecutive sequence of transmissions by the equipment, without it performing a new CCA, shall not exceed the
Maximum Channel Occupancy Time as defined in point 3) above. NOTE 3: 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)
For transmit power levels of 23 dBm e.i.r.p. or above, the CCA threshold level (TL), at the input to the receiver, shall be ‑73 dBm/MHz assuming a 0 dBi receive antenna.
For transmit power levels below 23 dBm e.i.r.p., the CCA threshold level (TL), at the input of the receiver, shall be proportional to the maximum transmit power (PH)
according to the formula which assumes a 0 dBi receive antenna and PH to be specified in dBm e.i.r.p. TL = -73 dBm / MHz + (23 dBm - PH) / (1 MHz) petere From: Peter Ecclesine (pecclesi)
Hi All, The portal has been updated and new items include Rapporteur new Work Item RE-D BRAN(14)87r5 (equal pain for all) ***Ericsson/Nokia/Qualcomm analysis BRAN(14)106 BRAN New Work items BRAN(14)107r1 LS to WG FM on 5 GHz in vehicles BRAN(14)108r2 LS to SE24 5725-5925 BRAN(14)109r1 I hope one of the attendees will post which version of BRAN(14) was finally agreed to. petere From: *** Regulatory and Spectrum Allocation Topics *** [mailto:STDS-802-11-REG@xxxxxxxx]
On Behalf Of Peter Ecclesine (pecclesi) Hi All, Considering EN 301 893 v1.7.1 becomes in effect from 1 January, 2015 http://www.etsi.org/deliver/etsi_en/301800_301899/301893/01.07.01_60/en_301893v010701p.pdf EN 301 893 v1.7.2 failed ENAP review
http://www.etsi.org/deliver/etsi_en/301800_301899/301893/01.07.02_20/en_301893v010702a.pdf At the 802.11 Members Area, near the bottom, Are links to the local copy of BRAN documents, dated December 12, 2014, particularly the contributions to BRAN http://www.ieee802.org/11/private/ETSI_documents/BRAN/05-CONTRIBUTIONS/2014/
NSO comments on EN 301 893 v1.7.2 Rapporteur proposal v172f BRAN(14)80a1r1 Cablelabs analysis BRAN(14)95, 95a1 Cisco discussion and way forward BRAN(14)97 Broadcom analysis BRAN(14)98 Rapporteur new Work Item RE-D BRAN(14)87r3 During the BRAN#81 meeting, I expect revisions of 87r3 and harmonized analysis contributions ;-) Votes on Work Items and outcomes are taken December 19, 2014 petere Peter Ecclesine, Technology Analyst MS SJ-14-4 170 West Tasman Dr, San Jose, CA 95134-1706
Ph 408/527-0815, FAX 408/525-9256 "Time doesn't fool around." "Without Prejudice" U.C.C. 1-308 _______________________________________________________________________________
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