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Machine-to-machine (M2M) communications are expected to provide ubiquitous connectivity between machines without the need of human intervention. To support such a large number of autonomous devices, the M2M system architecture needs to be extremely power and spectrally efficient. This article thus briefly reviews the features of M2M services in the third(More)
Femtocells technology has emerged as a promising solution to provide the indoor coverage in the 3rd generation (3G) long-term evolution (LTE) and its advanced (LTE-Advanced) networks. In this paper, we propose a two-step interference coordination scheme to deal with the interference between femtocells in LTE-Advanced networks with carrier aggregation. Each(More)
Railway wireless communication networks demand good system coverage and high transmission rate. To meet these requirements, in the railway wireless communication networks, we propose a cooperative hierarchical transmission scheme with the deployment of relay nodes. In our scheme, the requested data of each user at its serving evolved NodeB is firstly(More)
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