Subject: [Mipshop] comments on Mobile IPv6 Fast Handovers over IEEE 802.16e Networks draft

From: Subba Reddy <[email-masked]>
Date: Fri, 15 Jul 2005 11:14:32 +0530

Hi,
   
   I have gone through the draft. Overall draft is good.

Here are few comments.

1. The draft is not talking about the network initiated L3 handover. 

    I think, it is possible in the following scenario

a)      BS and AR are collocated (as in Figure 3), and 

b)      BS is sending MOB_BSHO-REQ

Then AR can send PrRtAdv to MN, so that MN can start 

handoff immediately (with out exchanging RtSolPr, PrRtAdv). 

To accomplish this, a new trigger from L2 to L3 (similar to the 

three primitives namely Link_Going_Down, Link_Up and Link_Switch 

defined in the draft for interaction between FMIPv6 and 802.16e) 

in BS may be required.

2. In section 6.2 . 6.2  Handover Execution

    When the FBAck message arrives before the handover, the MN runs as   predictive mode.  If the MN can not acquire the FBAck message on the   current link, it should run as reactive mode.  One reason for this is   that the MN has not sent FBU.  The other is that FBAck is lost during   the handover.

.

Another reason can be FBU itself is lost as mentioned in FMIPv6 draft.

one Typo:

 In Section 6.1,    After receiving either MOB_BSHO-RSP or MOB_BSHO-REQ message, the MN   may sends FBU (Fast Binding Update) to the PAR.  At this time, the       ^^^^^      Link_Going_Down (LGD) is introduced to signal L3 of L2 reception of   MOB_BSHO-REQ/MOB_BSHO-RSP as soon as possible. 

s/send/sends

Thanks & Regards,

Subba Reddy
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