서비스 품질 조정을 고려한 동기화 전송 방안 = A Synchronized Delivery considering Quality of Service

다국어 초록 (Multilingual Abstract)

When continuous media are transmitted over the communication networks, asynchrony may occur due to a random transit delay, which can not maintain temporal relationships among packets.
There exist two types of the transport protocol which considers for guaranteed or non-guaranteed resource networks. So do synchronization schemes. The former applies a resource reservation technique and maintains delay characteristics, however, the latter supplies a best-effort service.
In this paper, I propose a intra-media synchronization scheme to transmit continuous media on general networks not guaranteeing a bounded delay time. The scheme controls transmission times of the packets by estimating next delay time with the delay distribution. So, the arriving packets may be maintained within a limited delay boundary, and playout will be performed after buffering to smoothen small delay variations.
The continually increasing delay to network overload causes buffer underflow at the receiver. To solve it, the transmitter is required to speed up instantaneously. Too much increase of transmission-rate may cause network congestion. At that time, the transmitter performs media scaling-down by dropping the current packet when informed excessive delay from the receiver.