MTC原版白皮书下载
。络网要主的网联物和讯通场近化心中去来未 为成会将它,本成右左的设建络网网联物少减接直将这据数输传来等 TOI-BN/aroL:如网专的贵昂设建再要需不也备设网联物,塞堵络网的致导 易交量大决解,输传据数的备设网联物及动流值价的全安/捷快/网无现实 中络网CTM在们它助帮,等 niahcA/mutQ/SOE/muerehtE/nioctiB:如 目项链块区的有所持支够能它,递传值价的捷便/速快现实下况情网无在备 设网联物和目项链块区有所让能就,络网hseM CTM了有,施设络网础基 的网联物和络网链块区代一下是它,议协络网hseM的化心中去全完是CTM
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Low-Rate Machine-Type Communication via Wireless Device-to-Device (D2D) Links
Wireless cellular networks feature two emerging technological trends. The first is the direct Device-to-Device (D2D) communications, which enables direct links between the wireless devices that reutilize the cellular spectrum and radio interface. The second is that of Machine-Type Communications (MTC), where the objective is to attach a large number of lowrate low-power devices, termed Machine-Type Devices (MTDs) to the cellular network. MTDs pose new challenges to the cellular network, one if which is that the low transmission power can lead to outage problems for the cell-edge devices. Another issue imminent to MTC is the massive access that can lead to overload of the radio interface. In this paper we explore the opportunity opened by D2D links for supporting MTDs, since it can be desirable to carry the MTC traffic not through direct links to a Base Station, but through a nearby relay. MTC is modeled as a fixed-rate traffic with an outage requirement. We propose two network-assisted D2D schemes that enable the cooperation between MTDs and standard cellular devices, thereby meeting the MTC outage requirements while maximizing the rate of the broadband services for the other devices. The proposed schemes apply the principles Opportunistic Interference Cancellation and the Cognitive Radio’s underlaying. We show through analysis and numerical results the gains of the proposed schemes


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