Re: [Mobile IP] MN behaviors to uplink data packets during a handoff

Hi,

I believe these are all implementation time decisions.

For #1, if you are talking about MIPv4, what is happening within the IP 
layer should not affect the link layer.  If it still has upper layer 
packets to send out it will continue to do so.  The link/MAC layer does not 
and should not know what happens at the other layers other than the packets 
it receives from them.  Although with MIPv6 there are proposals for 
inter-layer communications.

For #2, the OPNET MIPv4 simulation model, for example, keeps sending the 
data packets to the last known agent (HA or FA) on the last known good 
interface whether it is lost or in the process of registration.  This 
decision was made because once you start queueing packets and managing 
them, the implementation becomes expensive considerably in the simulation 
domain as well as for the OSes in the real devices.

Hope this helps, - Jay


At 09:37 PM 7/23/2003 +0100, Ji Zhang wrote:
>Hi all,
>
>Could anybody offer me some instructions on the behaviors of a Mobile Node
>to
>uplink (MN-->FA) data packets during a handoff?
>
>For example,
>1. when the MN loses link contact with the old FA (before getting an agent
>advertisement), are all uplink data packets stored up at the link layer?
>2. when the MN is aware of agent advertisements are missing, at the same
>time it sends an agent solicitation, should it stop sending data packets
>until
>it gets an agent advertisement (or even until the registration is
>successful)?
>
>Many thanks,
>Jee