[ndnSIM] How can application detect change in point of attachment to the Internet

[Natalya Rozhnova]

Hi Monika,

This is not a very trivial problem :)

Well, what you can do is to look into the ns3/wifi module and use the callbacks provided by the sta-wifi-mac on association and disassociation events.
You can use these callbacks from your producer node and activate whatever you want when this events happen. Or, if the implemented callbacks are not sufficient for your goal, you can add your own ones.

Hope it helps,
Best,
Natalya

> Le 24 avr. 2016 à 15:19, Monika Dangi <monikabaraut at gmail.com> a écrit :
> 
> Thank you Lixia Zhang for your reply.
> well my problem is the producer is mobile, and i want the producer application to know when the point of attachment to a router is changed so that the retransmission timer is set accordingly. Is there any function in ns3/mobility-module.h or in the ns3/wifi-module.h( perhaps in YansWifiPhyHelper ) that returns the node id of the router to which the mobile node ( producer ) is attached????  The scenario is, there is a grid of nodes and an mobile node which is moving randomly in any direction and may get attached to any grid node and starts sending packet. 
> 
> i just want to know the time till a mobile node stays attached to a router(grid node), so i thought if there is any function in ns3/mobility-module.h or ns3/wifi-module.h, that can tell the current attached router node's id then i can calculate the time mobile node stays attached to a router.
> i hope you understand the scenario. 
> Thank-you
> 
> On Wed, Apr 20, 2016 at 8:13 PM, Lixia Zhang <lixia at cs.ucla.edu> wrote:
> 
>> On Apr 20, 2016, at 4:24 AM, Monika Dangi <monikabaraut at gmail.com> wrote:
>> 
>> Hey All,
>> i am working on mobility model in NDN, well there is a way of communication from application layer to network layer. But I am stuck at how to tell application layer that the mobile node has moved and now the point of attachment is changed.
> 
> Not sure I understand the picture in your mind.
> 1/ NDN's communication model is data fetching: consumer app sends interest packets, that either successfully bring back data packets, or fail to do do. 
> 2/ if the mobile nodes are consumers, consumers do not need to do anything special when moving.
> 3/ if the mobile nodes are producers, depending how producer mobility is handled, consumers figure out ways to get the data produced by mobile producers.
> 4/ there is a recent paper on
> "A Survey of Mobility Support in Named Data Networking"
> http://lasr.cs.ucla.edu/afanasyev/data/files/Zhang/nom16-ndn-mobility-survey.pdf
> 
>> Is there anybody working on similar problem? or can anybody provide me literature so that i can look myself?  
>> 
>> Thank-you
>> 
>> -- 
>> Monika
>> MTech CSE
>> IIT Roorkee
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> 
> 
> 
> 
> -- 
> Monika
> MTech CSE
> IIT Roorkee
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