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Recently, the 3rd Generation Partnership Project (3GPP) has standardized LTE-licensed assisted access (LTE-LAA) supporting LTE downlink carrier aggregation (CA) in the 5 GHz unlicensed spectrum. LTE-LAA technology allows LTE operators to freely use additional frequency resources in the 5 GHz unlicensed spectrum. Therefore, the problem of coexistence with other existing communication technologies in...
Along with the surge of data traffic amount, Long Term Evolution (LTE)-based Device-to-Device (D2D) communication is emerging as a key data traffic offloading technology. However, current LTE-based D2D communication has limitations such as the lack of feedback mechanism, causing difficulty for efficient radio resource use. In this paper, we propose a feedback mechanism as well as a feedback-based...
The backhaul-linked cellular network architecture shows an intrinsic defect in its delay characteristic when coordinated multipoint (CoMP) joint transmission (JT) is operated. Channel state information (CSI) fed back to evolved Node B (eNB) is used to calculate joint beamforming (BF) matrices, and the results are delivered to helping eNBs, which participate in CoMP JT, through the backhaul link. The...
LTE operation in unlicensed spectrum is emerging as a promising technology in achieving higher data rate with LTE since ultra-wide unlicensed spectrum, e.g., about 500 MHz at 5–6 GHz range, is available in most countries. Recently, 3GPP has finalized standardization of licensed assisted access (LAA) for LTE operation in 5 GHz unlicensed spectrum, which has been a playground only for Wi-Fi. LAA defines...
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