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    • 22. 发明授权
    • Radio station, radio terminal, and synchronization timer control method in radio communication system
    • 广播电台,无线电终端,以及无线电通信系统中的同步定时器控制方法
    • US08989013B2
    • 2015-03-24
    • US14235723
    • 2012-07-12
    • Hisashi Futaki
    • Hisashi Futaki
    • H04L1/00H04B7/212H04J3/06H04L5/00H04J11/00H04W56/00
    • H04W56/0005H04J11/0069H04L5/0032H04W56/0045H04W72/121
    • A radio station, a radio terminal, and a method for synchronization timer control are provided that can reduce a delay as much as possible until uplink signal resynchronization is done in a case where a plurality of cell groups exist. In a radio communication system having a function of using a plurality of radio resources corresponding to a plurality of cells, respectively, for communication between a radio station (10) and a radio terminal (20), the radio terminal is provided with a plurality of synchronization timers for determining whether or not uplink signals in individual cell groups are in synchronization, wherein the synchronization timers are provided respectively for the plurality of cell groups each including at least one cell, and at the radio terminal (20), uplink-signal transmission on the cells included in a second cell group is controlled depending on a state of a first synchronization timer provided correspondingly for a first cell group including a specific cell and on a state of a second synchronization timer provided correspondingly for the second cell group other than the first cell group, wherein the first synchronization timer and the second synchronization timer are controlled independently.
    • 提供无线电台,无线电终端和用于同步定时器控制的方法,其可以在存在多个小区组的情况下尽可能地减少延迟直到上行链路信号重新同步。 在具有分别对应于多个小区使用多个无线电资源的功能的无线电通信系统中,用于无线电台(10)和无线电终端(20)之间的通信,所述无线电终端设置有多个 用于确定各个小区组中的上行链路信号是否同步的同步定时器,其中分别为包括至少一个小区的多个小区组提供同步定时器,并且在无线终端(20)处,上行链路信号传输 根据对于包括特定小区的第一小区组相应地提供的第一同步定时器的状态和针对第二小区组的第二小区组相应地提供的第二同步定时器的状态来控制包括在第二小区组中的小区的状态 第一单元组,其中第一同步定时器和第二同步定时器被独立地控制。
    • 25. 发明申请
    • OFDM Communication System, Method for Generating Feedback Information Thereof, and Communication Apparatus
    • OFDM通信系统,用于生成反馈信息的方法和通信装置
    • US20090060064A1
    • 2009-03-05
    • US11887831
    • 2006-04-04
    • Hisashi FutakiYoshikazu KakuraShousei YoshidaTakumi Ito
    • Hisashi FutakiYoshikazu KakuraShousei YoshidaTakumi Ito
    • H04L27/28H04J11/00
    • H04L5/0091H04L1/0026H04L1/0028H04L5/0007H04L5/006
    • An OFDM communication system which performs appropriate feedback flexibly adapted to channel states, while suppressing an amount of feedback information. The OFDM communication system has first and second communication apparatuses. In a second receiver of the second communication apparatus, a channel quality measurement part measures channel quality for each of sub-carriers. A time variation measurement part and a frequency measurement part respectively measure variation of channel quality in a time domain and a frequency domain, respectively, and output the variation of channel quality as time variation information and frequency variation information, also respectively. Based on the measured time variation information and frequency variation information, a two-dimensional control part performs two-dimensional blocking for forming two-dimensional blocks each from plural adjacent sub-carriers which are adjacent to each other in the time domain and the frequency domain. The two-dimensional control part measures and outputs channel quality of each two-dimensional block, as feedback information.
    • OFDM通信系统,其能够在抑制反馈信息的量的同时,进行灵活地适应于信道状态的适当的反馈。 OFDM通信系统具有第一和第二通信装置。 在第二通信装置的第二接收机中,信道质量测量部分测量每个子载波的信道质量。 时间变化测量部分和频率测量部分别分别测量时域和频域中的信道质量的变化,并分别输出信道质量的变化作为时间变化信息和频率变化信息。 基于所测量的时间变化信息和频率变化信息,二维控制部分在时域和频域中彼此相邻的多个相邻子载波中进行二维块形成二维块 。 二维控制部分测量并输出每个二维块的通道质量作为反馈信息。