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、Fast HMIP、Fast 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、duplicate 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、HMIP 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、Fast HMIP、Fast 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、duplicate 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，
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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