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In Long Term Evolution Advanced (LTE-A) Release 12 (Rel-12), small cell enhancement (SCE) has been intensively discussed since it could substantially provide capacity boosting and is beneficial for future network, where the requirement of data rate is much higher. In small cell environment, resource and interference coordination are of great importance to exploit the performance gain, especially in...
This paper proposes an enhanced interference measurement method that provides accurate channel quality indicators (CQIs) to improve the system performance in coordinated multi-point (CoMP) transmission and reception. In CoMP operations, user equipments (UEs) need to report different CQIs based on different interference hypotheses. Even though a variety of interference measurement schemes are proposed,...
This paper focuses on investigating the search space design of Enhanced Physical Downlink Control CHannel (EPD-CCH), which is introduced in Long Term Evolution-Advanced (LTE-A) system to increase the capacity of the downlink control channel. Since EPDCCH is frequency-division-multiplexed with downlink data channel, resource utilization efficiency is a very important issue in addition to blocking probability...
In this paper, adaptive power saving methods considering multi-user diversity and channel dependent scheduling characteristics are proposed for Long-Term Evolution (LTE) and beyond system. In LTE, Discontinuous Reception (DRX) is applied in User Equipment (UE) to conserve mobile terminal's battery power. According to our observation, system load and channel variation have great impact to the power...
Coordinated Multi-Point (CoMP) transmission is considered for Long Term Evolution - Advanced (LTE-A) as an effective method to improve both average and cell-edge throughput. However, most of current research on CoMP with Multi-User (MU)-MIMO are under ideal assumption. In this paper, we study CoMP under realistic conditions, including limited feedback and complexity. Taking both performance and complexity...
In LTE, AC barring check is performed by UEs before initiating an RRC connection. In some cells with a low access probability, the UEs may have to keep retrying access in the serving cell which results in higher connection failure and longer access delay. We therefore propose balancing the UEs by adjusting the cell reselection criteria based on the access probability in the serving cell and neighboring...
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