RE: Re: [802.21] Network Controlled Handover and IS
-----Original Message-----
From: stds-802-21@ieee.org [mailto:stds-802-21@ieee.org] On Behalf Of
stefano.faccin@nokia.com
Sent: 25. elokuuta 2005 9:55
To: STDS-802-21@listserv.ieee.org
Subject: RE: Re: [802.21] Network Controlled Handover and IS
Junghoon,
-----Original Message-----
From: ext Junghoon Jee [mailto:jhjee@etri.re.kr]
Sent: Wednesday, August 24, 2005 11:29
To: Faccin Stefano (Nokia-NRC/Dallas); STDS-802-21@LISTSERV.IEEE.ORG
Subject: RE: Re: [802.21] Network Controlled Handover and IS
Hi Vivek and Stefano,
[Vivek G Gupta]
Many of the existing media specific technologies already do this in some
form. For example 802.11k provides access to link layer measurements like
Bit Rate, BER, etc. that you mention above. Other media specific
technologies also have a provision for something similar.
Given that, do we need any additional methods/primitives or capabilities
from 802.21 for above?
[[Stefano] ] I think the answer is completely depending on the use
scenarios. Let's assume a 3GPP network operator owns multiple accesses, such
as 802.11 and 802.16 in addition to the 3GPP specific access networks. Let's
assume the operator is interested in having network controlled HO e.g. for
load sharing or other reasons that require stricter control that the one
granted by simply controlling the policies in the terminal used to decide HO
between technologies. In such case, it may be difficult in practical
implementations to have an MME function in the network that relies on
existing L2 technology-specific to collect the information. it pretty much
implies a tight IW of the various radio interfaces/ANs at L2, that may not
be that easy to implement nor that acceptable to 3GPP operators/vendors. In
such scenario, using 802.21 at "L3 and above" to allow reporting of
information to the MIHF in an MME that is used to control inter-technology
HO may be an easy and clean way to!
go. I see this as a very relevant scenario for "L3 and above" MIH.
=>
[Junghoon]
I tend to agree about the scenario that Stefano mentioned as a general
application of MIH.
However, I have some concern regarding the network-initiated
inter-technology handover.
To support not one or two mobile terminals, overloading of MIH _handover_
control entity by enormous MIH events and commands...
IMO, it would be better to let a mobile terminal have a brain about
inter-technology handover decision.
[[Stefano] ] I surely don't disagree that there are challenges. however,
there are at present requirements coming from some 3GPP operators to enable
such network controlled handoffs, and I believe 802.21 should enable them.
If one wants to use them or not, that's up to the manufactures and
operators. If we do not enable the scenarios for which we have requirements,
we risk to restrict 802.21 applicability to the real world.
[Reijo] In 21-05-0344-00-0000-Aug25_2005_3GPPRequrements_Telecom_MoM.doc
2.1.2 and 2.4.1 is stated "Note that 3GPP has stopped work on scenarios 4
and higher". I'm a bit puzzled with with the requirement situation at 3GPP,
I hope the situation will be clarified eg in the next 3GPP-adhoc.
BR Reijo