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G’day Steve I suggest that 802.19 talk about : ·
UL LBT
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IEEE 802 did not reach agreement on this topic for the 3GPP LAA Workshop because many IEEE 802 folk rejected the idea of LBT for PIFS on UL
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It appears 3GPP are now going down this same direction for which there was significant disagreement in IEEE 802
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ie they are proposing less LBT on the UL
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IEEE 802 probably need to agree on a position ·
Multichannel access
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802.11 has a multichannel access mechanism based on the use of a primary channel
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It appears LAA might have a different mechanism
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It is possible that this different mechanism may give LAA an advantage over 802.11
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IEEE 802 probably need to agree on a position ·
ED
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This is an open and ongoing issue in 3GPP
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IEEE 802 have an agreed position
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But 3GPP appear to be going down a really weird path
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RAN1 shall identify adaptation rules for LAA to adaptively lower the maximum energy detection threshold to ensure co-existence with other RATs including Wi-Fi and good performance of LAA
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Technologies that ensure co-existence with other RATs including Wi-Fi, using alternative means not requiring lowering of the maximum energy detection threshold, are not precluded.
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At least the following shall be considered in defining the adaptation rules of the maximum energy detection threshold:
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Antenna gain and number of transmit antennas
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Coexistence with LAA in absence of other RATs including Wi-Fi
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The maximum rated EIRP of the LAA transmission point within unlicensed band
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The maximum EIRP within the transmission burst following the LBT procedure
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The transmission bandwidth
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Measured ambient noise floor
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Deployment scenario: Indoor, outdoor
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Estimated Load on the operating channel
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Feasibility of the co-existence test
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Single global solution ·
Control frames
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There is a move in ETSI BRAN to allow control frames to access the medium without LBT with a 5% duty cycle
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This might be OK, but that depends on the definition of a control frame
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Many 3GPP folk would consider a Beacon to be a control frame It would be great if someone else decided to lead the discussion …
J Andrew From: Shellhammer, Steve [mailto:sshellha@xxxxxxxxxxxxxxxx]
All, At the 3GPP LAA workshop the RAN1 chair said he would extract the LAA relevant material from the chairs report to help people in the IEEE follow the status of LAA. Attached is the LAA related material of the chairs report. Please look it over. Next week in Bangkok if anyone is interested in reviewing this document and preparing any feedback to 3GPP please notify me. Also, at the workshop one of the topics that came up was coexistence testing. RAN4 will look at this in the future, but IEEE could start to look into this and provide input to RAN4. Topics to be considered
are, ·
Specification of Coexistence Metrics and Scenarios ·
Specification of Coexistence Testing Plans If anyone has any thoughts of these and would like to give a presentation next week please notify me. Steve -----Original Message----- Dear all, Thank you very much for giving me nice and good opportunity to meet you in LAA workshop. It was good meeting, I think. Please find my chairman's note for LAA in the last week. I hope current email addresses are sufficient one, but if not, please add more email addresses or tell me who is not included in this email. Satoshi Nagata NTT DOCOMO, INC. 3GPP TSG-RAN WG1 chairman |