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The user-perceived performance of voice services can be improved if the handover (HO) criterion is designed to consider the mean opinion score (MOS). However, this involves several problems, such as the measurement difficulty of the MOS, the detection difficulty of the MOS degradation factors, and the requirement of cross-layer design. To solve these problems, we propose an abstracted R-factor-based...
This paper proposes silence drop first algorithm(SDF) for the active buffer management. This algorithm finds and drops silence packet rather than talkspurt packet in the queue for resolving buffer overflow of queue. This algorithm can serve more simultaneous user while maintain voice service quality with same link capacity. Simulations with voice codec of G.711 and G.729a are performed in this paper...
The demand of multimedia services has extensively increased in conjunction with the popularity of the smart phone and the deployment of high speed broadband wireless networks. Especially, the video telephony service is one of the most used multimedia services. It has a stringent quality-of-service (QoS) requirement including high data rate and low latency among multimedia services. Therefore the optimizing...
This paper proposes the uplink resource allocation scheme based on MPEG-4 codec for the video telephony service in IEEE 802.16 e systems. The main feature of the proposed scheme is that the base station (BS) exploits a pattern of variablesize frames which is the character of MPEG-4 codec to allocate uplink resources to the mobile station (MS). The simulation result shows the proposed scheme reduces...
A novel context modeling scheme is presented for loss-less image compression. First, each line in the input image is divided into 1 times N line segments, called processing unit (PU). Then, the statistical reference is evaluated in each PU, which reveals the randomness of pixels in the local image region. The context is designed based on both neighbor pixels and the statistical reference. Finally,...
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