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    • 2. 发明授权
    • Communication system and time synchronization method
    • 通信系统和时间同步方法
    • US08712244B2
    • 2014-04-29
    • US13210165
    • 2011-08-15
    • Makoto HasegawaKazuyori UmematsuTohru KazawaAtsushi Otani
    • Makoto HasegawaKazuyori UmematsuTohru KazawaAtsushi Otani
    • H04J14/08H04B10/00
    • H04J3/0655H04J3/0644H04J3/0673H04J3/0682
    • In a communication system using a PON, time synchronization of a slave device such as a base station is realized with respect to a master device such as an L2SW or the base station. Time information acquired by a GPS satellite is corrected by ranging information of a discovery function of an OLT so as to be reflected on time information of each ONU. A propagation delay from the L2SW to the OLT is obtained with the use of a delay estimation mechanism, a propagation delay from the OLT to the ONU which is obtained by ranging is added to obtain a propagation delay from the L2SW to the ONU. The obtained propagation delay from the L2SW to the ONU is added to the transmitted time stamp value whereby a time stamp value received at a base station or femtocell side becomes a time into which the propagation delay to the ONU is incorporated, and absolute values of clock timers can be synchronized with each other. The addition process can be realized by rewriting the time stamp value of the packet within the OLT or the ONU.
    • 在使用PON的通信系统中,相对于诸如L2SW或基站的主设备实现诸如基站的从设备的时间同步。 由GPS卫星获取的时间信息由OLT的发现功能的测距信息进行校正,以反映在每个ONU的时间信息上。 通过使用延迟估计机制获得从L2SW到OLT的传播延迟,通过添加通过测距获得的从OLT到ONU的传播延迟,以获得从L2SW到ONU的传播延迟。 所获得的从L2SW到ONU的传播延迟被添加到发送的时间标记值,由此在基站或毫微微小区侧接收的时间标记值变为并入到ONU的传播延迟的时间,并且时钟的绝对值 定时器可以彼此同步。 可以通过重写OLT或ONU内的分组的时间戳值来实现相加处理。
    • 10. 发明申请
    • Resonant Element and High Frequency Filter, and Wireless Communication Apparatus Equipped with the Resonant Element or the High Frequency Filter
    • 谐振元件和高频滤波器,以及配备有谐振元件或高频滤波器的无线通信装置
    • US20090224855A1
    • 2009-09-10
    • US12043585
    • 2008-03-06
    • Yasushi YamaoMakoto HasegawaHiroyuki Kobayas
    • Yasushi YamaoMakoto HasegawaHiroyuki Kobayas
    • H01P7/08H01P1/203
    • H01P7/08H01P1/203
    • What is disclosed is a resonant element that causes a signal input from an input terminal to resonate at a predetermined resonance frequency and outputs it to an output terminal. The element has a transmission line series that includes a plurality of transmission lines connected in series with each other and intersects with a hotline that connects the input terminal and the output terminal and a plurality of switches, wherein at least one of one end and the other end of the transmission line series is a grounded end, the transmission lines are categorized into a first transmission line, which is a transmission line having a fixed length, and a second transmission line, which is a transmission line to which the switch one end of which is a grounded end is connected in series at a point between it and an adjacent transmission line, the transmission line in one end side of the transmission line series in a first section extending from a intersection point of the transmission line series and the hotline to one end of the transmission line series and the transmission line in the other end side of the transmission line series in a second section extending from the intersection point to the other end of the transmission line series are the second transmission lines, the first transmission lines are provided in the first section and the second section, and the resonance frequency is switched by turning on/off the switch to change the sum of the lengths of the transmission lines through which the signal passes.
    • 公开了一种谐振元件,其使来自输入端的信号输入以预定的谐振频率谐振并将其输出到输出端。 该元件具有传输线系列,其包括彼此串联连接的多个传输线,并且与连接输入端和输出端的热线和多个开关相交,其中一端和另一端中的至少一个 传输线系列的端部是接地端,传输线被分类为具有固定长度的传输线的第一传输线和作为传输线的一端的传输线的第二传输线 接地端在其与相邻的传输线之间的点处串联连接,传输线的一端侧的传输线在从传输线系列和热线的交点延伸到第一部分中的传输线 传输线系列的一端和传输线系列的另一端侧的传输线在从第一部分延伸的第二部分中 传输线系列的另一端的第二传输线是第一传输线,第一传输线设置在第一部分和第二部分中,并且通过接通/关闭开关来切换谐振频率, 信号通过的传输线的长度。