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    • 22. 发明申请
    • CHANNEL SWITCHING APPARATUS AND METHOD OF A BASE STATION AND CHANNEL SWITCHING APPARATUS AND METHOD OF A TERMINAL BASED ON THE COGNITIVE RADIO SYSTEM
    • 信道切换装置和基站和信道切换装置的方法和基于认知无线电系统的终端的方法
    • WO2009078606A1
    • 2009-06-25
    • PCT/KR2008/007190
    • 2008-12-05
    • ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEKO, GwangzeenYOU, Sung-JinSONG, Myung-SunHWANG, Sung-HyunUM, Jung-SunKIM, Chang-Joo
    • KO, GwangzeenYOU, Sung-JinSONG, Myung-SunHWANG, Sung-HyunUM, Jung-SunKIM, Chang-Joo
    • H04B7/155
    • H04W48/12H04W16/14H04W36/06H04W72/042H04W72/0446
    • In a cognitive radio system, when communication in an operational channel is determined to be discontinued due to that an incumbent user (IU) entering the operational channel that is currently being used or due to that an excessive interference occurring in the operational channel, the operational channel is switched to a pre-arranged channel. However, since some parameters are different between the operational channel and the pre-arranged channel, an initialization procedure has to be performed to allow the cognitive radio system to be adapted to those some parameters. Since an initialization technique aiming for this situation is not developed yet, a conventional cognitive radio system uses a general initialization technique used to initially operate a system. However, the general initialization technique has to allow the system to be adapted to many parameters so that it takes a relatively long initialization time. A channel switching apparatus and method thereof of a base station, which allocates a slot for data exchange with each of a plurality of terminals in a frequency channel that is not used by the IU and thus performs communication, include transmitting a channel switching message for requesting to switch to a backup channel when a signal of the IU is sensed in the frequency channel; transmitting a beacon frame via the backup channel, wherein the beacon frame comprises allocation information about slots which are in the frequency channel and which are respectively allocated to each of the plurality of terminals; and allocating the slot for data exchange with each of the plurality of terminals to the backup channel according to the allocation information, and communicating with each of the plurality of terminals. By doing so, frequency resources between each of networks can be efficiently used, and convenience and efficiency with respect to network operation can be maximized.
    • 在认知无线电系统中,当由于现有用户(IU)进入当前正在使用的操作信道或由于在操作信道中发生的过度干扰而确定操作信道中的通信被中断时,操作 通道切换到预先安排的通道。 然而,由于操作信道和预先安排的信道之间的一些参数不同,因此必须执行初始化过程以允许认知无线电系统适应那些一些参数。 由于尚未开发针对这种情况的初始化技术,传统的认知无线电系统使用用于初始操作系统的一般初始化技术。 然而,一般的初始化技术必须允许系统适应许多参数,从而需要较长的初始化时间。 一种基站的信道切换装置及其方法,其分配与IU未使用的频道中的多个终端中的每一个进行数据交换的时隙,从而进行通信,包括:发送用于请求的信道切换消息 当在频率信道中感测到IU的信号时切换到备用信道; 经由所述备份信道发送信标帧,其中,所述信标帧包括关于处于所述频道中并且分别分配给所述多个终端中的每一个的时隙的分配信息; 以及根据所述分配信息将与所述多个终端中的每一个进行数据交换的时隙分配给备份信道,并与所述多个终端中的每一个进行通信。 通过这样做,可以有效地利用每个网络之间的频率资源,并且可以最大限度地提高网络操作的便利性和效率。