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    • 10. 发明授权
    • Radio communication system, radio base station apparatus, user terminal and radio communication method
    • 无线通信系统,无线基站装置,用户终端和无线通信方式
    • US09444527B2
    • 2016-09-13
    • US14356171
    • 2012-11-01
    • NTT DOCOMO, INC.
    • Satoshi NagataXiang YunXiaoming SheLan Chen
    • G01R31/08H04B7/02H04L1/00H04L5/00H04B7/06H04W24/10H04W72/08
    • H04B7/024H04B7/0626H04B7/0632H04B7/065H04L1/0026H04L1/0029H04L1/003H04L5/0007H04L5/0035H04L5/0073H04W24/10H04W72/085
    • To reduce overhead of CSI feedback without decreasing throughput in applying CoMP transmission, a radio communication method of the invention is characterized by including, in a user terminal measuring quality information for each of cells to perform Coordinated Multi-Point transmission, and notifying a radio base station apparatus of the quality information, in the radio base station apparatus calculating a quality difference between the cells to perform Coordinated Multi-Point transmission, by using the quality information for each the cells from the user terminal, determining granularity of inter-cell channel state information for each of the cells based on the quality difference, and notifying the user terminal of the granularity, and, in that the user terminal generating inter-cell channel state information for each of the cells according to the granularity from the radio base station apparatus, and transmitting the inter-cell channel state information for each of the cells to radio base station apparatuses of cells to perform Coordinated Multi-Point transmission.
    • 为了减少CSI反馈的开销而不降低应用CoMP传输的吞吐量,本发明的无线电通信方法的特征在于在用户终端中包括测量每个小区的质量信息以执行协调多点传输,并通知无线电基站 在无线基站装置中,通过使用来自用户终端的各小区的质量信息,确定小区间信道状态的粒度,计算出小区之间的质量差进行协调多点发送 基于质量差的每个小区的信息,并且向用户终端通知粒度,并且用户终端根据来自无线基站装置的粒度来生成每个小区的小区间信道状态信息 ,并且将每个小区的小区间信道状态信息发送到rad io基站装置执行协调多点传输。