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Hi Srini,
Usually, MN can't begin L3 mobility management
procedure until it attaches to the target network. So the total handover
latency is the sum of L2 latency and L3 latency, which can be described with the
following equation:
T =
L2 latency + L3 latency
If L2 message is allowed to carry some IP layer
information, some L3 function (i.e. configuration, conflict detection
and tunnel management etc.) can be performed before the completion of L2
handover, which would reduce the total handover latency obviously. Ideally, it
can be reduced to the bottom limit:
T =
max {L2 latency, L3 latency}
I don't think it's redundant, restrictive and conflicting IMHO. On
the contrary, it's a feasible way to perform cross-layer
optimization.
B.R.
Yan
Hi,Srini,
Yes, current IP
Fast handover procedures have own messages, they do not work on any the
link specific information which can be useful in handovers. But since
the IP Fast handover procedure happened before MN attached target
network, and IEEE 802.21 purpose is prepare for handover, why we cannot
use the existing MIH messages to carry some IP information such as IP
address and so on to finish configuration, conflict detection and tunnel
management in advance, thus it may reduce some signalings spending(such
as FBU, HI, HAck, FBack messages in FMIP protocol), and accelerate
handover completion? I just think it maybe a feasible
method.
Regards,
Jing
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----- Original Message -----
Sent: Wednesday, May 09, 2007
12:27 AM
Subject: RE: [802.21] MIH
commands for handover
Hi Jing,
> Whereas, for fast handover
protocol,such as FMIP$B!"(BFast HMIP$B!"(BFast PMIP and so on, it
implements before MN attached target network, so we can use MIH
commands to finish the procedure of IP address
configuration$B!"(Bduplicate address detection and tunnel building
during handover preparation, thus it will reduce the handover delay
and enhance handover efficiency.
While I do not understand the reasoning behind this, I can say
that the IP Fast handover procedures are defined with exactly the same
goals in mind - to reduce the service disruption to under 150ms. The
IETF WG have carefully identified and worked with everything related
to IP layer and above - IP addresses, conflicts,
configuration, tunnel management and so on in the respective
protocols. But they do not work on any the link specific (L2)
information which can be useful in handovers. The best value MIH can
add is in this area. Anything more, specially IP related
information, would be redundant, restrictive and conflicting
at best, IMHO.
Regards,
Srini
Hi
Michael,Srinivas,All
Of cource,
MIH User may be different mobility management
protocol.
For MIP protocol,such as PMIP$B!"(BHMIP
and NetLMM, it implements only after MN attached the target network,
so it is outside IEEE 802.21 standard.
Whereas, for
fast handover protocol,such as FMIP$B!"(BFast HMIP$B!"(BFast PMIP
and so on, it implements before MN attached target network, so we can
use MIH commands to finish the procedure of IP address
configuration$B!"(Bduplicate address detection and tunnel building
during handover preparation, thus it will reduce the handover delay
and enhance handover efficiency.
Different fast handover protocol may need
different parameters, whether we may define some latent parameters in
optional way in MIH messages, thus in different fast handover protocol
it may select different parameters to carry?
Regards$B!$(B
Jing
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----- Original Message -----
Sent: Tuesday, May 01, 2007
12:20 AM
Subject: Re: [802.21] MIH
commands for handover
Anurag, Sanjib,
All,
Would it be possible to spin these
contributions to illustrate .21 services interacting with PMIPor MIP
as well?
Best Regards,
Michael
Hello Anurag and Sanjib,
The intention of the MIH
handover command is not to replace FMIP signaling, but to complement
FMIP in aspects that are not present in FMIP. The assumption of MIH
as a handover control protocol is not valid, but it is provides
services for facilitating/aiding hanadovers with the assumption that
there is a different handover control protocol. There is no reason
to spin the wheels and redo a published and validated protocol again
in 802.21.
Regards,
Srini
-----Original
Message-----
From: ext Anurag Uxa [mailto:Anurag.Uxa@LNTINFOTECH.COM]
Sent:
Mon 4/30/2007 3:05 AM
To:
STDS-802-21@listserv.ieee.org
Subject: Re: [802.21] MIH commands
for handover
Dear Jing n All ,
As per your concern
about the DAD. It has already taken care. You are
just
considering the predictive situation, BUT we had thought
predictive and
reactive both a, b cases.
(a) able to
send fast binding update PAR and information Reached to
NAR
and confirmation has received by PAR but not MN
(b)
information has not reach to NAR.
Sanjib query is
relate to extend the command with some IPaddress
related
TLV.
MIH_MN_HO_Candidate_Query.request
(
DestinationIdentifier,
CurrentLinkIdentifier,
CandidateLinkList,
QueryResourceList,
CandidatePoAList,
CandidateNwAddrList,
/*Access router?s addresses or a single
address of
NAR*/
MN_NCoAList,
/*List of NCoA as per Target n/w prefix or
a single
NCoA*/
)
MIH_MN_HO_Complete.request
(
DestinationIdentifier,
LinkIdentifier,
HandoverStatus,
PreviousARAddress
/*PAR?s IP Address*/
PreviousCoA
NewCoA
)
If every
body is ok with such changes, we will go ahead with
our
assumptions.
Regards
----------------------------------------------------------------------
Anurag
Uxa
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liujing
<jxli1979@HUAWEI.COM>
04/29/2007 08:21 AM
Please respond
to
liujing
<jxli1979@HUAWEI.COM>
To
STDS-802-21@listserv.ieee.org
cc
Subject
Re:
[802.21] MIH commands for
handover
Hello?Sanjib
I agree your idea using MIH messages to carry some
MMP(mobility
management protocol) information during handover
procedure. But the
implementation method you proposed may exist
some problems. From the chart
we can see MN can generate the NCoA
from the available prefix info
obtained from IS Server, then MN
sends these configured NCoAs to all
candidate NARs existed in
each candidate networks to make Duplicate
Address Detection.
After duplicity checking, PAR in serving network will
create the
tunnel with these candidate NARs for sending the packets.
So
these steps such as NCoA configuration?duplicity checking and
tunnel
building work with all candidate networks, that will
increase the spending
of network resources.
I
suggest whether we can do these works after network decision,
namely
once the target network is chosen, MN can generate the
NCoA only for
target NCoA in target network, and sends this NCoA
to the target NAR by
MIH_MN_HO_Commit.request and
MIH_N2N_HO_Commit.request messages. Target
NAR will make
duplicity checking after receiving these messages, and
return the
result of DAD to PAR in serving network. Then PAR will create
the
tunnel with the target NAR. This will save network resources
and
enhance the efficiency of
handover.
regards,
Jing
Liu
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