document: Hybrid broadcast for the video-on-demand service Multicast offers an efficient means of distributing video contents/programs to multiple clients by batching their requests and then having them share a server 's video stream . Batching customers ' requests is either client-initiated or server-initiated . Most advanced client-initiated video multicasts are implemented by patching . Periodic broadcast , a typical server-initiated approach , can be entirety-based or segment-based . This paper focuses on the performance of the VoD service for popular videos . First , we analyze the limitation of conventional patching when the customer request rate is high . Then , by combining the advantages of each of the two broadcast schemes , we propose a hybrid broadcast scheme for popular videos , which not only lowers the service latency but also improves clients ' interactivity by using an active buffering technique . This is shown to be a good compromise for both lowering service latency and improving the VCR-like interactivity
doc_bio_tags: O O O O O O B O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O B I O O B I I O O O O O O O O O O O O O O O O O O O O B I I O O O O O O O O O O O O O O O O B O O O O O O O O O O O O O O O O O O O O O O O O B
extractive_keyphrases: interactivity multicast conventional patching customer request rate hybrid broadcast scheme
abstractive_keyphrases: quality-of-service scheduling video-on-demand