Re: [STDS-802-11-REG] FW: 802.11p US regulation for transmit power

[John H Notor <gnu@xxxxxxxxx>]

Adrian,

The band referred to in this section is related to ITS, or, in the US, DSRC. As you know, this band is currently subject to some controversy, which the Regulatory Standing Committee of 802.11 is addressing, and IEEE 802 has addressed in comments and reply comments to the 5 GHz NPRM in 2013.

From a regulatory standpoint, I don’t know whether the rules in this band will change, but they may change.

So, from the standpoint of the 802.11 standard, I’m not sure there is clear direction regarding this text.

Maybe somebody else has a better handle on this.

John

John Notor
President/Chief Technologist
Notor Research

Mobile: 1.408.316.8312

Web: www.notor.com

From: "Stephens, Adrian P" <Adrian.P.Stephens@xxxxxxxxx>
Reply-To: "Stephens, Adrian P" <Adrian.P.Stephens@xxxxxxxxx>
Date: Tuesday, November 25, 2014 at 11:29 PM
To: <STDS-802-11-REG@xxxxxxxxxxxxxxxxx>
Subject: [STDS-802-11-REG] FW: 802.11p US regulation for transmit power

Dear 802.11 regulatory members,

 

I received the enquiry below.

 

As IEEE-SA no longer has an “interpretations” process,  we have no formal process to respond to

such requests.   So any such response will necessarily be on an individual basis.

 

A possible response might be:

1.       Nothing at all (there is not a problem,  or the commenter is asking for consultancy,  or nobody cares)

2.       A determination that the standard needs to be changed

3.       A 1:1 correspondence with the sender

 

If anybody determines that the standard needs to be changed,  please let me know,

and I’ll work with the TGmc chair to ensure that the topic is covered.

 

If anybody wants to respond directly to the sender,  feel free to do so.

 

Best Regards,

 

Adrian P STEPHENS

 

Tel: +44 (1793) 404825 (office)
Tel: +44 (7920) 084 900 (mobile,  UK)

Tel: +1 (408) 2397485 (mobile, USA)

 

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From: Liesbeth Gomme [mailto:liesbeth.gomme@xxxxxxx]
Sent: 25 November 2014 11:56
To: Stephens, Adrian P
Cc: Tony Kerselaers
Subject: 802.11p US regulation for transmit power

 

Dear Mr. Stephens,

 

I have an inquiry with regard to the IEEE 802.11 regulation on the max. permitted transmit power. Heinz Mellein provided me with your contact details.

I found that the standard gives an unclear formulation. A first concern is that specifications are currently only given for non-mobile operations and not specified explicitly for mobile operation.

 

page 31, Table I.5a, in IEEE Standard for Information Technology-Telecommunications and information exchange between systems-Local and metropolitan area networks-Specific requirements Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications, Amendment 6: Wireless Access in Vehicular Environments, July 2010.

 

When assuming class C, the max. permitted e.i.r.p. is limited to 33dBm and the max. output power (at the antenna input) is specified as 100mW (20dBm). An antenna gain of 13dBi can be assumed in a non-mobile operation in an RSU.

 

If we base ourselves on this table for mobile operation, the max. EIRP of 33dBm on page 31, Table I.5a is not the limiting criterion. Whereas the Max. output power of 20dBm in the same table is because the antenna gain can be assumed to be less than 13dBi in mobile operation.

 

Is this a correct interpretation of the standard, and is it indeed so that an OBU should fulfill the most limiting of the specified value in table I.5a, which is Maximum power @ antenna input?

 

Class	Max. power @ antenna input [mW]
A	1
B	10
C	100
D	760

 

Looking forward to your reply. Many thanks in advance.

 

Best regards,

 

Liesbeth

 

 

Liesbeth Gommé

 

Central Research & Development / Innovation Center Connectivity / Connectivity Leuven

NXP Semiconductors

Interleuvenlaan 80, 3001 Leuven, Belgium

Tel +32 (0)16 390 867, Liesbeth.Gomme@xxxxxxx

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