[ns] Evaluation of Handover Latency in a WiFi-WiMax scenario

[Carlos Rodrigues]

Hi!

In some documents I read, about MIH, the handover begins with the  
detection of a new link, with better quality, and ends with the  
link_down the previous link.

"Handover  latency  is  the  time  interval  between  the  first   
Link_Going_Down  trigger generation and the HO_Complete generation."
http://users.ecel.ufl.edu/~ms987/802.21%20NS2.pdf

Link_Going_Down triggers detection link....

It's difficult see these procedures in trace file. Only have MIH packets...


----- Original Message -----
From: Lynoh MaGee
To: cmjr at iol.pt
Sent: Saturday, April 04, 2009 10:57 AM
Subject: RE: [ns] Evaluation of Handover Latency in a WiFi-WiMax scenario


Hi Carlos,

Could you share your code for handover latency calculation maybe we  
can share ideas. How did you get the 40 seconds. I am working on a  
similar project. I think the handover latency starts with a  
"link_down" from the previous node and finishes with a "link_up" in  
the new node. With "link_down", the  previous  node stops  receiving   
packets while with  "link_up", the new nodes starts receiving packets.  
I'm  not sure yet if this is correct  but will let you know as soon as  
  I am.

> Date: Sat, 4 Apr 2009 10:36:13 +0100
> From: cmjr at iol.pt
> To: linoh_9 at hotmail.com
> Subject: Re: [ns] Evaluation of Handover Latency in a WiFi-WiMax scenario
>
> Hi!
>
> I have a idea... starts with a "Link_detection" finishes with a  
> "Link_Down". But I'm not sure it is correct.
> But in a TCP scenario, handover takes 40 seconds!
>
> ----- Original Message -----
> From: Lynoh MaGee
> To: cmjr at iol.pt
> Sent: Friday, April 03, 2009 10:50 PM
> Subject: RE: [ns] Evaluation of Handover Latency in a WiFi-WiMax scenario
>
>
> Hi Carlos,
>
> Have you figured out how to measure the handover latency?..You  
> should consider using an awk script.
>
> Cheers,
> Lynoh
>
> > Date: Mon, 30 Mar 2009 18:45:00 +0100
> > From: cmjr at iol.pt
> > To: ns-users at ISI.EDU
> > Subject: [ns] Evaluation of Handover Latency in a WiFi-WiMax scenario
> >
> >
> > In a trace file of a scenario about handover from wifi to wimax  
> (or > vice versa), using MIH, how can I determine the latency of  
> handover?
> > What is the start message and the stop message that I have to use  
> to > calculate this?
> >
> > Note: I'm using NIST MIH module.
> >
> > All help or support will be very helpful.
> >
> > Cheers,
> > Carlos Rodrigues (Computer Science BSc student)
> > ESTG - IPL
> > Leiria, Portugal
> >
> >  
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