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Update on EN300 328

Update on EN300 328. Date: 2009-1-20. Authors:. ETSI EN 300 328 v1.8.1. ETSI requirements for “Data transmission equipment operating in the 2,4 GHz ISM band” Power limited to 100mW for RLAN devices Non-RLAN devices limited to 10mW, but requested change to allow 100mW operation

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Update on EN300 328

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  1. Update on EN300 328 Date: 2009-1-20 Authors: Rich Kennedy, OakTree Wireless

  2. ETSI EN 300 328 v1.8.1 • ETSI requirements for “Data transmission equipment operating in the 2,4 GHz ISM band” • Power limited to 100mW for RLAN devices • Non-RLAN devices limited to 10mW, but requested change to allow 100mW operation • Wi-Fi Alliance and IEEE 802.18 commented on keeping 100mW for LBT, spectrum sharing devices • ETSI “attempted” to fix this

  3. Then I Got This Note Adrian Stephens: I have performed my own analysis of the rules that are in EN 300 328.  I find that the CSMA/CA channel access mechanism doesn't meet the rules as described.  There is an inherent structural difference that CCA may be sampled in a slotted fashion during backoff - i.e. there is no requirement to be sensitive to CCA outside certain times (as I read the standard).    The rules in '328 talk about the medium being idle for a [by implication, continuous] period of time. A secondary issue is that the rules as described would prevent the use of the 802.11e QoS EDCA channel access mechanism,  which relies on the ability to use smaller CWmin values for high priority traffic.

  4. The Changes • First attempt • Specified mechanisms • It takes IEEE-SA 1300 pages • A few paragraphs in EN 300 328could not safely replicate it • Latest effort • Refer to IEEE 802.11 standard instead of trying to specify it • Revision 1.8.1 not yet published

  5. To be continued…

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