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Femtocells tend to be large scale and self-organized, which complicates the interference environment of mobile networks. In this case, interference between femtocells cannot be ignored, casing the restriction of the usage of wireless resources. Meanwhile, traffic classes are booming in recent years, and it is very likely that different traffic types with different QoS demand contend with resources...
In this paper, we discuss the cross-layer network resource allocation scheme for video services in multi-radio multichannel (MRMC) networks. Since video services include a large amount of traffic to transmit, compared with single-radio singlechannel (SRSC) networks, MRMC networks could provide more network resource to support the large video traffic. However, MRMC networks also require more delicate...
The hidden terminal problem is particularly common in wireless local networks (WLANs). It is the dominant factor to reduce throughput. In this paper, we develop a new method to improve throughput in WLANs with hidden terminals under the non-saturated condition. The hidden terminal problem may result in very large contention window size, so that much channel resource is wasted. Our method efficiently...
In cognitive radio networks, the available vacant frequency bands, referred to as spectrum holes, are usually discontinuous. Hence, it is hard to exploit these vacant frequency bands since the bandwidth of single one may not be able to meet the wide bandwidth requirement of secondary users (SUs). Spectrum aggregation (SA) enables SUs to access several discontinuous spectrum holes simultaneously to...
Dynamic spectrum sharing plays a critical role in cognitive radio for the efficient spectrum utilization. In this paper, we consider a cooperative spectrum leasing model, in which the primary user (PU) may lease part of its bandwidth to the secondary user (SU) in exchange for the cooperation to maximize its power saving, under the constraint that its target is guaranteed. In return, the SU can take...
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