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Re: [STDS-802-11-REG] EN 300 328, version 1.9.1

Hi Guido, all,

I managed to get hold of some in-house experts and our conclusion is that given that clause 5.3.7.2.1.3 step 2 mandates "normal transmissions" we should be considering the representative traffic to be access category AC_BE which should comply with the 160 us limit.

Anybody else?

Best regards

	Jens

> -----Original Message-----
> From: *** Regulatory and Spectrum Allocation Topics *** [mailto:STDS-
> 802-11-REG@xxxxxxxx] On Behalf Of Dr. Guido R. Hiertz
> Sent: 07 February 2014 17:31
> To: STDS-802-11-REG@xxxxxxxxxxxxxxxxx
> Subject: [STDS-802-11-REG] EN 300 328, version 1.9.1
> 
> Hi all,
> 
> because of the discussion of ETSI EN 300 328 during this group's
> meeting in LA I reviewed the document's latest version 1.9.1. Clause
> 4.3.2.5.2.2.2 defines the so called "Extended CCA" that fits to the
> 802.11 backoff procedure. EN 300 328 requires the channel to be
> observed for "a random duration in the range between 18 µs and at least
> 160 µs." That fits with standard DCF. However, MSDUs transmitted within
> AC_VO of an 802.11e compliant STA use a random interval of
> 
>     AIFS (AC_VO) + 0 × aSifs = 34 µs
>     AIFS (AC_VO) + 7 × aSifs = 97 µs
> 
> So this doesn't fit into EN 300 328 requirements. Would it be advisable
> to change EN 300 328 therefore?
> 
> Best regards,
> 
> Guido
> 
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