30-05-2012, 12:10 PM
Multicasting in AdHoc Networks
[attachment=23485]
Why Multicast in AdHoc?
Forming an AdHoc network implies cooperativeness
Many applications of sending data from one to many
Team environment of AdHocs seems to imply a greater need for Multicast than perhaps wired networks
Definition
AMRIS is a multicast routing protocol for ad-hoc wireless networks
Operates independently of the underlying unicast protocol.
Assigns every node (on demand) in a multicast session with an id-number.
Protocol Implementation
On Demand protocol
Constructs shared delivery tree
Key Idea
Each participant in the multicast session has a session-specific multicast session member id (msm-id).
Significance of msm-id ->Provides each node with the indication of its logical height in the multicast delivery tree
TREE INITIALIZATION
New Session contains -> Sid’s MSM-id,
Multicast Session ID,
Routing metrics.
Nodes that’s are interested in being a part of the
Multicast session called I-Nodes join in the Initialization
Phase.
Uninterested nodes U-Nodes may still become part of
the multicast session.
Simulation Results
Increase in Mobility causes the packet delivery ratio to decrease and thus performance falls in dynamic conditions
Multicast session with more I-Nodes perform better than those with less I-Nodes since nodes are better able to find neighbors that are already registered on the tree.
[attachment=23485]
Why Multicast in AdHoc?
Forming an AdHoc network implies cooperativeness
Many applications of sending data from one to many
Team environment of AdHocs seems to imply a greater need for Multicast than perhaps wired networks
Definition
AMRIS is a multicast routing protocol for ad-hoc wireless networks
Operates independently of the underlying unicast protocol.
Assigns every node (on demand) in a multicast session with an id-number.
Protocol Implementation
On Demand protocol
Constructs shared delivery tree
Key Idea
Each participant in the multicast session has a session-specific multicast session member id (msm-id).
Significance of msm-id ->Provides each node with the indication of its logical height in the multicast delivery tree
TREE INITIALIZATION
New Session contains -> Sid’s MSM-id,
Multicast Session ID,
Routing metrics.
Nodes that’s are interested in being a part of the
Multicast session called I-Nodes join in the Initialization
Phase.
Uninterested nodes U-Nodes may still become part of
the multicast session.
Simulation Results
Increase in Mobility causes the packet delivery ratio to decrease and thus performance falls in dynamic conditions
Multicast session with more I-Nodes perform better than those with less I-Nodes since nodes are better able to find neighbors that are already registered on the tree.