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    • 10. 发明授权
    • Frequency selection method and cognitive wireless system
    • 频率选择方法和认知无线系统
    • US09313778B2
    • 2016-04-12
    • US14357471
    • 2012-11-07
    • TOYOTA JIDOSHA KABUSHIKI KAISHA
    • Yutaka IharaOnur Altintas
    • H04W72/00H04W24/00H04W72/04H04W16/14G08G1/056G08G1/09H04L5/00H04W72/10H04W64/00H04W4/02
    • H04W72/0406G08G1/056G08G1/094H04L5/0066H04W4/029H04W16/14H04W64/006H04W72/10
    • A frequency to be used in a cognitive wireless system is determined appropriately. A DB apparatus manages white spaces (WS) for each frequency, and calculates and reports, to a mobile terminal, WS vectors (distances from a mobile terminal location to an interference area in the four directions, north, south, east and west) for each frequency. The mobile terminal refers to the WS vectors and uses a frequency providing the longest available distance in a direction of movement. The available distance is calculated by interpolation (triangular interpolation, elliptical interpolation, rectangular interpolation) of WS boundaries using various methods. Desirably, the mobile terminal reports a direction of movement to the DB apparatus, and the DB apparatus reports the distance to an interference area only in the two directions near to the direction of movement. Furthermore, desirably, information indicating whether the interference areas in the two directions are the same area or different areas is added to the WS vectors, and the interpolation method employed by the mobile terminal is changed in accordance with this information.
    • 适当地确定在认知无线系统中使用的频率。 DB装置针对每个频率管理白空格(WS),并且向移动终端计算WS向量(从移动终端位置到在四个方向上的干扰区域的距离,北,南,东和西)的WS向量,用于 每个频率。 移动终端参考WS向量并且使用提供移动方向上最长可用距离的频率。 通过使用各种方法的WS边界的插值(三角插值,椭圆插值,矩形插值)来计算可用距离。 理想地,移动终端报告向DB设备的移动方向,并且DB设备仅在靠近移动方向的两个方向上报告到干扰区域的距离。 此外,期望地,向WS向量添加指示两个方向上的干扰区域是相同区域还是不同区域的信息,并且根据该信息改变移动终端采用的插值方法。