Re: stds-80220-requirements: 802.20 Requirements: Handoff Text
Hi Jim,
I'm a little confused by what you mean by "handoff support below the IP
layer." Obviously if one hands a session off at the IP layer there has to
be a procedure for establishing connectivity between the user terminal
and the new basestation and closing connectivity with the prior basestation.
Hence the air interface by default has to support "handoff support below the
IP layer".
I must be missing something subtle here so please clarify.
Also, I will let the John Humbert comment on whether this section should
be reopened but I'll throw in my two cents. This section was explcitly
discussed on a number of the conference calls and should in my opinion
only be reopened if we get to, as Mark Klerer, put it "complete breakdown".
I don't think we're there.
See for example:
Date: Sun, 7 Sep 2003 11:06:30 -0500
From: "Mcginniss, Dave S [GMG]" <david.s.mcginniss@mail.sprint.com>
To: <stds-80220-requirements@ieee.org>
"The following sections have been moved to a Closed/Stable status. They
were reviewed on the 9/4/2003 call.
4.5.1 Handoff Support
(Closed/Stable).........................................................
...................................................... 39
4.5.1.1 IP-Level Handoff
(Closed/Stable).........................................................
........................................ 39"
Mike
On Thu, Oct 23, 2003 at 12:10:48PM -0700, James Tomcik wrote:
>
>
> Attached is some text for the requirements document on handoff (802.20 to
> 802.20). These sections were deleted because there was no contributed
> requirement in this area. This text probably belongs in section 4.4 since
> it is in support of MAC-Level Handoff. I call it 4.4.2 below.
>
> Rationale:
> To support high speed mobility, handoff support below the IP layer is
> essential to an efficiently operating air interface. For example, at 250
> km/hr, assuming 1km cell radius as a nominal size, a mobile station could
> be in handoff processing at rates up to several handoffs per minute. This
> handoff rate will be difficult to support well at the IP layer, given IP
> network delays, and the messaging overhead of current network layer
> mobility solutions.
>
> Proposed to include the following:
>
> 4.4.2 MAC Layer Handoff
>
> The Air Interface shall include handoff support below the IP
> layer. Handoff mechanisms defined shall insure the uninterrupted flow of
> data to and from the Mobile Station at rates up to 6 handoffs per minute.
>
> -=================================
> ..................................................................................
>
> 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
> ..................................................................................