Re: stds-80220-requirements: 802.20 Requirements: Handoff - 2
Jim,
I strongly disagree with your line of reasoning below.
The kind of interoperability you are suggesting would obviously be an
enormous complication and I think we would need solid reasons for making
such a course change. 802.20 is NOT targeted as an extension
to any of the systems you mention below and so handoff to them is not
relevant to our current goals. If it were any other
way I think the PAR would have explicitly said so.
Also, I think that 802.20 can stand alone as a successful network
without the interoperability you mention below. If classical voice
networks are anything to go by, I would say the market has spoken loud
and clear on the need for such interoperability. For example, I know of
no systems that support handoff between GSM and CDMA. Also I very much
doubt we will be seeing the equivalent for 2.5G any time in the near
future.
Finally, I know that the current requirements document says that handoff
to various 3G technologies was deleted for lack of contribution.
However, I'd like to point out that this issue was discussed
prior to our July meeting and an explicit decision was made to remove
this section because it has little relevance to our current objectives.
Again I will let the John Humbert make the call.
See for example the following email from Dave McGinniss as we were
preparing for the July meeting:
On Thu, Jun 26, 2003 at 05:15:13PM -0500, Mcginniss, Dave S [GMG] wrote:
> I do not believe that any of the following things belong in the
> requirements document.
>
>
>
> 1 Handoff's to other technologies
>
Mike
On Thu, Oct 23, 2003 at 12:25:40PM -0700, James Tomcik wrote:
>
>
> Attached is some text for the requirements document on handoff (802.20 to
> other systems). These sections were deleted because there was no
> contributed requirement in this area.
>
> Rationale:
> To support 3G service continuity and interworking with other deployed
> systems, handoff support is essential to an efficiently operating 802.20
> system. Since many emerging services are IP-based handoff support is
> advocated for these. Because of the high-speed aspects of the 802.20 air
> interface, and the latencies involved with network level handoff,
> mechanisms incorporated below the network layer are essential to service
> continuity. For example, several handoffs per minute between a 3G system
> and an 802.20 system may be required.
>
> Proposed to include the following:
>
> 4.4.x 3G Interworking and Handoff
>
> The Air Interface shall include handoff support with 3G systems below the
> IP layer. Handoff mechanisms defined shall insure the uninterrupted flow
> of data to and from the Mobile Station at rates up to 2 handoffs per
> minute. 802.20 Mobile Stations and Base Stations shall support at minimum:
> a. Handoff with cdma2000 1x systems
> b. Handoff with WCDMA systems
> c. Handoff with cdma 1xEV-DO (rev "0" and rev A) systems
> d. Handoff with GSM/GPRS Systems
> e. Handoff with EDGE Systems
>
>
>
> ==========================================================
>
> -=================================
> ..................................................................................
>
> James D. Tomcik
> QUALCOMM, Incorporated
> (858) 658-3231 (Voice)
> (619) 890-9537 (Cellular)
> From: San Diego, CA
> PGP: 5D0F 93A6 E99D 39D8 B024 0A9B 6361 ACE9 202C C780
> ..................................................................................