文档介绍：IEEE TRANSACTIONS ON MULTIMEDIA, VOL. 7, NO. 4, AUGUST 2005 777
Real-Time Video Transport Optimization Using
Streaming Agent Over 3G works
Gene Cheung, Member, IEEE, Wai-tian Tan, Member, IEEE, and Takeshi Yoshimura, Member, IEEE
Abstract—Feedback adaptation has been the basis for many TABLE I
media streaming schemes, whereby the media being sent is DEFINITIONS WORK AND APPLICATION STATES
adapted in real time according to feedback information about
the work state and application state. Central to the
ess of such adaptive schemes, the feedback must: 1) arrive
in a timely manner and 2) carry enough information to effect
useful adaptation. In this paper, we examine the use of feedback
adaptation for media streaming in 3G works, where
the media servers are located in works while the clients
are wireless. We argue that end-to-end feedback adaptation using the work due to congestion, the sources should reduce
only information provided by 3G standards is neither timely nor
contain enough information for media adaptation at the server. their transmission rate. One effective mechanism to provide ad-
We first show how the introduction of a streaming agent (SA) at ditional information that allow sources to take appropriate ac-
the junction of the wired and work can be used to tions is the RTP monitoring agent [5]—work agent located
provide useful information in a time