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—TV is regarded as a key service for mobile devices. In the past, Mobile TV was often associated with broadcast transmission. However, unicast technology is sufficient in many cases, especially since mobile users prefer to access content on-demand, rather than following a fixed schedule. In this paper we will focus on 3G mobile networks, which have been(More)
Mobile media streaming is envisioned to become an important service over packet-switched 2.5G and 3G wireless networks. At the same time, TCP-friendly rate-adaptation behavior for streaming will become an important IETF requirement. In this paper we investigate TCP-friendly on-demand streaming over wired and wireless links. We consider two approaches for(More)
treaming has become increasingly important over the past few years, not only in the fixed Internet but also in 2.5/3G mobile networks [1, 2]. One popular example is mobile TV: during 2004 many operators around the world launched " broadcastlike " services in their mobile networks, which allow mobile users to watch live TV channels via on-demand streaming.(More)
—In 3GPP a standard for multimedia streaming over mobile networks called PSS (Packet-switched Streaming Service) has been specified. In order to deal with changing transmission characteristics like varying link bit-rate or handover, adaptive streaming features like client feedback have been included into Release 6 of 3GPP PSS. The adaptive behavior of the(More)
A new transmission rate control for wireless multimedia streaming is introduced using RTCP feedback about the status of the streaming client buffer. Here, extended RCTP feedback is used as described within the 3GPP PSS streaming standard. Compared with algorithms from the literature buffer overflows are always avoided and higher buffer utilization is(More)
Since in video telephony the image quality in the face is subjectively more important for a human observer than the image quality in other head parts like the hair, the neck and the ears, a knowledge–based analysis–synthesis coder should code different head parts with different qualities. For this, an automatic segmentation of a head into different head(More)