RE: stds-80220-requirements: 802.20 Requirements: 4.1.11 Antenna Diversity
Walter,
We've had this discussion before on the exploder/meetings, and as Mike has summarized, I believe credible rationales were put forward for not mandating mobile terminal receive diversity with much support in the group for that viewpoint.
Regards,
Samir
-----Original Message-----
From: Michael Youssefmir [mailto:mike@arraycomm.com]
Sent: Thursday, November 06, 2003 11:10 AM
To: Rausch, Walter F [GMG]
Cc: ! Stds-80220-Requirements (E-mail); Michael Youssefmir
Subject: Re: stds-80220-requirements: 802.20 Requirements: 4.1.11
Antenna Diversity
Hi Walter,
I now undertsand what your preface "At a minimum" means. Essentially
you are mandating receive diversity. So I think we are back to square
one on this issue. As the current revision of the document shows
there is substantial disagreement in the wider group on this topic.
I don't see how your new text really resolves any of this. I will
just reiterate my opposition for any requirement that mandates the use
of diversity (specifically at the user terminal) for the reasons
stated in our previous lengthy discussion: Market needs vary for
many reasons in different places and with different market
segments, often requiring tradeoffs between performance, cost and other
factors like terminal size. Therefore, terminals with single antennas
should be allowed.
Mike
On Thu, Nov 06, 2003 at 09:06:25AM -0600, Rausch, Walter F [GMG] wrote:
> Mike,
>
> In 4.1.11, prefaced the requirement statement with, "At a minimum", as an encouragement to all manufacturers to provide as robust an airlink as possible. Stated this way, any standards compatible AI will at least offer RX diversity, but no vendor is prevented from providing more advanced techniques.
>
> Section 4.1.10 remands manufacturers to provide attachment points within the PHY/MAC for the use of advanced antenna technologies, either within his own product offering, or as upgrades at some future date. Such upgrades may be provided by third parties, and may use techniques that were unavailable when the original equipment was manufactured.
>
> Walter Rausch
>
> -----Original Message-----
> From: Michael Youssefmir [mailto:mike@arraycomm.com]
> Sent: Wednesday, November 05, 2003 8:34 PM
> To: Rausch, Walter F [GMG]
> Cc: ! Stds-80220-Requirements (E-mail); Michael Youssefmir
> Subject: Re: stds-80220-requirements: 802.20 Requirements: 4.1.11
> Antenna Diversity
>
>
> Hi Walter,
>
> I have a couple comments regarding your proposed text:
>
> > 4 .1.11 Antenna Diversity
> > At a minimum, the Air Interface shall provide support for receive diversity.
>
> I think we should remove the text "At a minimum" as it provides
> little information.
>
> Also can you please clarify your proposal itself. For example, it is
> not completely clear what is being mandated and how this contributes
> more beyond section 4.1.10:
>
> 4.1.10 Support for Multi Antenna Capabilities (Closed)
>
> Interconnectivity at the PHY/MAC will be provided at the Base Station and/or the Mobile Terminal for advanced multi antenna technologies to achieve higher effective data rates, user capacity, cell sizes and reliability. As an example, MIMO.
>
> Mike
>
>
> On Fri, Oct 31, 2003 at 02:55:11PM -0600, Rausch, Walter F [GMG] wrote:
> >
> > 802.20 Requirements: 4.1.11 Antenna Diversity
> >
> >
> > Current Text (and comments)
> >
> >
> >
> >
> >
> > Editors Note: there are two versions of this section and there are numerous proponents for deleting this section. <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />
> >
> > At a minimum, both the Base Station and the Mobile Terminal shall provide two element diversity. Diversity may be an integral part of an advanced antenna solution.
> >
> >
> >
> > The Base Station shall provide antenna diversity. Diversity may be an integral part of an advanced antenna solution. Antenna diversity shall not be a requirement of the mobile station.
> >
> >
> >
> > Proposed Text change.
> >
> > 4 .1.11 Antenna Diversity
> >
> >
> > At a minimum, the Air Interface shall provide support for receive diversity.
> >
> > Rational
> >
> > Multiple antenna diversity at it's simplest provides known gain for minimal hardware and development efforts. The vendor community is free to work within these guidelines to provide the most cost-effective implementation.
> >
> >
> > Walter Rausch
> > Principal Network Evolution Planner
> > Sprint Broadband
> > 6360 Sprint Parkway, Bldg. 5
> > MS: KSOPHE0310-3A350
> > Overland Park, KS 66251
> > walter.f.rausch@mail.sprint.com
> > Voice: 913-762-1598
> > FAX: 913-762-0506
> >
> >
> >
> >
> >