Subject: [dtn-users] RGBF in DTN

From: <[email-masked]>
Date: Wed, 14 Dec 2011 17:52:08 +0000

Hello,

I have very basic question after reading paper about Reliable group Based Forwarding (RGBF) in DTN, which is
Reliable Multicasting in Disruption Tolerant Networks by Kamalavasan Srinivasan Microsoft Corporation Email: [email-masked]<mailto:[email-masked]>

First of all, IP multicast is not possible and not supported by routing algorithm in DTN, so the end user has to replicate messages/bundles, which in another words called application layer multicast. So in RGBF a node n1 multicast a message to 2 nodes (n2, and n3) in the group which are in first contact or within the range of that node, then the two nodes which received the message will replicate the message and multicast again to the nodes (n4,n5,n6) which comes in their range, so after this multicasting by n2 and n3,

1.       Does n1 receive the second copy of the message?

2.       As both n2 and n3 multicast, so does n4, n5, n6 receives two copies of the same message each from n2 and n3?

I would appreciate your response on these questions.

Kind regards

Naveed Ahmad