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This paper assesses the effect of a reliable groupcast scheme on QoE of audio and video multicast transmission over a wireless LAN. We assume that a wireless access point transmits audio and video streams from a server on a wired network to several terminals connected to the access point. We compare the three schemes: unicast, groupcast without reliability, and LBP (Leader Based Protocol). A computer...
This paper proposes a scheme of user-assisted QoS control by media adaptive buffering for user-assisted Quality of Experience (QoE) enhancement. The scheme consists of two modes: a manual mode and an automatic mode. Users can switch these two modes according to their inclinations. We deal with four QoS control schemes for comparison: the manual mode only, the automatic mode only, the switching scheme...
This paper studies QoE (Quality of Experience) enhancement of audio-video IP transmission over the uplink channel, i.e., from subscriber stations (SSs) to the base station (BS), in the IEEE 802.16 BE service. We assume two types of capacity allocation schemes for uplink and downlink burst durations: static and adaptive. Furthermore, we introduce a piggyback request mechanism for uplink bandwidth requests...
This paper studies QoE (Quality of Experience) in Multi-View Video and Audio (MVV-A) transmission over IP networks where the users change the viewpoint by request. It jointly analyzes the effects of user interfaces for viewpoint change and contents in conjunction with network performance in a multidimensional way. In order to assess the QoE, we perform a subjective experiment which employs two user...
This paper studies a method of enhancing QoE (Quality of Experience) in H.264-video and audio IP transmission by jointly applying FMO (Flexible Macroblock Ordering) and SCS (Switching between error Concealment and frame Skipping), which is a QoE-based video output scheme simply based on the receiver's operation. We conducted objective and subjective experiment on the method for combinations of two...
This paper assesses QoE and application-level QoS of Multi-View Video and Audio (MVV-A) transmission over IP networks. We focus on the effects of camera arrangements and contents on QoE/QoS. We employ two types of application-level QoS parameter: user's behavior and output quality. For QoE assessment, we apply the Semantic Differential (SD) method and perform subjective experiment with two camera...
This paper compares QoE (Quality of Experience) of audio-video IP transmission with IEEE 802.11e EDCA and that with DCF in mobile ad hoc networks. We also assess QoE of the transmission with TXOP-bursting, which is an optional function of EDCA. QoE assessment of audio-video IP transmission in mobile ad hoc networks involves difficult issues. The wireless nodes can move, and then channel condition...
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