RE: stds-80220-requirements: 802.20 Requirements: Handoff - 2
Alan,
Handoffs between 802.20 base stations may not always occur at Layer 2. If the 802.20 BSs (source & target BS) are located in different IP subnets, then a network layer mobility protocol would be a natural way and Mobile IP could be used (Layer 3).
For an analogy, in 802.11, Access Points that are within the same ESS generally can handle handoffs at Layer 2 (with old proprietary or IEEE standard based on IAPP) but the 802.11 standard did not state what will happen to upper layer protocols (or applications) if a mobile tried to handoff between two different ESSs (i.e., between two APs in different IP subnets). This might have been justified in an wireless LAN environment. However, in the wide area cellular system like 802.20, I think it is unrealistic to assume handoffs can always be done at Layer 2.
Nat Natarajan
Motorola Inc
1501 W Shure Drive
Arlington Heights, IL 60004
847-632-6303
847-812-6318 (mobile)
-----Original Message-----
From: Chickinsky, Alan [mailto:alan.chickinsky@ngc.com]
Sent: Friday, October 24, 2003 6:47 PM
To: 'Lalit Kotecha'; 'Stds-80220-Requirements (E-mail)'
Subject: RE: stds-80220-requirements: 802.20 Requirements: Handoff - 2
I believe handoff to other networks are layer 3. But handoff to another 802.20 base station is a layer 2. I make the difference because the packet sizing, message formats ma be different with different specifications.
You should also be aware that 802.1 bridge handles the handoff between 802 systems.
alan
-----Original Message-----
From: Lalit Kotecha [mailto:lkotecha@sbcglobal.net]
Sent: Friday, October 24, 2003 5:26 PM
To: Chickinsky, Alan; 'Stds-80220-Requirements (E-mail)'
Subject: Re: stds-80220-requirements: 802.20 Requirements: Handoff - 2
Alan,
I am not very active in this group, but I have a concern about your comments on handoff. Yes, handoff may be a layer3 functionality (not aalways necessary), but to support handoff, PHY and MAC needs to perform some tasks like channel measurements (signal strength, channels quality like BER, FER). Also, PHY MAC design needs to take care of situation to provide enough time to provide channel measurements (in terms of radio time).
If 802.20 needs to support handoff with other systems, PHY/MAC needs to providesome capability, though it is harder task to draw a line that what is part of PHY/MAC and layer3.
Jim listed five other wireless systems to support handoff with. Does anyone specify/design system to inter-operate with majority of the wireless systems?
my 2c if it adds any value.
Thanks
Lalit Kotecha
----- Original Message -----
From: "Chickinsky, Alan" <alan.chickinsky@ngc.com>
To: "'Stds-80220-Requirements (E-mail)'" <stds-80220-requirements@ieee.org>
Sent: Friday, October 24, 2003 2:09 PM
Subject: RE: stds-80220-requirements: 802.20 Requirements: Handoff - 2
>
> Jim-
>
> interms of the IOS model, I assume handoff occurs at layer 3. And we
> do not define layer 3. So I conclude that your proposed text is nice,
> but it is not part of the specification we will produce.
>
> alan
>
> -----Original Message-----
> From: James Tomcik [mailto:jtomcik@qualcomm.com]
> Sent: Thursday, October 23, 2003 3:26 PM
> To: 'Stds-80220-Requirements (E-mail)'
> Subject: stds-80220-requirements: 802.20 Requirements: Handoff - 2
>
>
>
>
> 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
>
............................................................................
> ......