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A LARGE SCALE RELIABLE MULTICAST

 

TITLE A LARGE SCALE RELIABLE MULTICAST.
AUTHOR TAWAN PHURAT
DEGREE MASTER OF SCIENCE PROGRAMME IN COMPUTER SCIENCE
FACULTY FACULTY OF SCIENCE
ADVISOR DAMRAS WONGSAWANG
CO-ADVISOR CHOMTIP PORNPANOMCHAI
 
ABSTRACT
A reliable and efficient data transfer control protocol is necessary for multicast application especially in a large-scale network environment. There are two major problems in controlling the data transfer. These are the implosion and exposure problem. Implosion is a problem in a multicast host when that host receives a lot of acknowledgement packets from many lost-packet-detected membership clients. This disturbs the processing load for the host. The exposure is the problem in multicast clients that receipt a lot of retransmission data packet as well as that are lost in route. This event makes the processing overload at the client level difficult. This thesis proposed two methods to reduce the two problems. The First method is called a first volunteer approach that reduces the number of acknowledgement packets to one packet. Next, the client from each local collision domain acknowledged the lost packet and then forwards a local retransmission packet to other clients. The second is called a router-based approach A modified multicast router will block the multicast host who receives redundant acknowledgement packets from another router. This means that with lost detection the multicast host can detection on receipt acknowledge only one receipt from all of the clients. The simulation results as compared with two classical reliable multicast methods include the traditional multicast (N1) and the last method is an improved traditional multicast (N2). The experiments indicate that the throughput results are satisfied within throughput constraints.
KEYWORD RELIABLE MULTICAST / RETRANSMISSION TECHNIQUE / MULTICAST ROUTING PROTOCOL / IMPLOSION PROBLEM / EXPOSURE PROBLEM / THROUGHPUT

 

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