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In this paper, we propose an anti-interference cooperative spectrum sharing strategy based on fairness secondary users selection where the secondary system can gain spectrum access to the primary system. Specifically, secondary user STb and STq are selected to transmit the primary and secondary signal by using different bandwidth in the second transmission slot which occupies a part of the whole transmission...
A segment selection method controlled by Quality of Experience (QoE) factors for Dynamic Adaptive Streaming over HTTP (DASH) is presented in this paper. Current rate adaption algorithms aim to eliminate buffer underrun events by significantly reducing the code rate when experiencing pauses in replay. In reality, however, viewers may choose to accept a level of buffer underrun in order to achieve an...
In this paper, we propose a cooperative anti-interference spectrum sharing strategy with secondary user selection where the secondary system can gain spectrum access along with the primary system. Specifically, secondary user STband STqare selected to transmit the primary and secondary signal through different bandwidth in the second transmission slot which occupies 1—tb fraction of the time. Thus,...
In this paper we investigate the cooperative spectrum sharing in cognitive radio networks with proactive primary system. In our scheme, Primary User (PU) is rewarded for sharing its licensed spectrum with Secondary Users (SUs) by charging their total throughput directly. The PU performs as the leader and chooses its interference-cap and transmit-power jointly to maximize its reward from spectrum-sharing...
In this work we deal with video streams over TCP networks and propose an alternative measurement to the widely used and accepted peak signal to noise ratio (PSNR) due to the limitations of this metric in the presence of temporal errors. A test-bed was created to simulate buffer under-run in scalable video streams and the pauses produced as a result of the buffer under-run were inserted into the video...
In this work, we investigate a new objective measurement for assessing the video playback quality for services delivered in networks that use TCP as a transport layer protocol. We define the new metric as pause intensity to characterize the quality of playback in terms of its continuity since, in the case of TCP, data packets are protected from losses but not from delays. Using packet traces generated...
This paper will look at the benefits and limitations of content distribution using Forward Error Correction (FEC) in conjunction with the Transmission Control Protocol (TCP). FEC can be used to reduce the number of retransmissions which would usually result from a lost packet. The requirement for TCP to deal with any losses is then greatly reduced. There are however side-effects to using FEC as a...
In this paper we investigate the possible benefits of a caching scheme for video encoded using the data partitioning option from the H.264 standard. We propose a method to measure the importance of a partition based on its contribution to the peak signal-to-noise ratio (PSNR) on all affected frames, and we term this measurement as PSNR profit. We calculate the average PSNR profit for each frame and...
We investigate the performance of IEEE 802.11e enhanced distributed channel access (EDCA) using real world hardware in a realistic indoor working environment. TCP streams of different priorities representing traffic types, such as FTP are tested over a wireless network test-bed. Quality of service (QoS) metrics such as throughput and delay are calculated directly from a passive capture of the channel...
The service flows in the wireless metropolitan area networks (MAN) can be classified into the UGS, rtPS, nrtPS, and BE types by IEEE 802.16 standards. Although the protocols have been proposed to support QoS (quality of service) guarantees for various kinds of applications, they do not suggest how to schedule traffic to fulfill QoS requirement. In this paper, an efficient bandwidth scheduling architecture...
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