Multicast algorithms using status of receivers in WDM broadcast network for CDN

Abstract

Multicasting the multimedia content usually requires broader bandwidth than unicasting service and accordingly WDM broadcast network has been highly recommended for the infrastructure network of CDN(Content Delivery Network). Multicast Service can be implemented by unicast scheduling algorithm, but unnecessary multiple transmissions of a multicast message may result in a waste of bandwidth. To reduce the number of transmissions, multicast service transmits only one message to all destinations, but this may result in excessive receiver waiting time due to complicated transfer scheduling protocol. Although the WDM broadcast network easily supports the multicast service, multicast group partitioning problem must be resolved to reduce the receiver's waiting time and the number of transmissions. In this paper, we propose methods for partitioning a multicast group into smaller subgroups and for scheduling a separate transmission for each of these subgroups. The proposed algorithms reduce the receivers' waiting time by using the previous status of receivers. We analyze the proposed algorithms comparing with the conventional research through the computer simulation. © Springer-Verlag Berlin Heidelberg 2004.