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    Transmission power control method for a wireless communication system
    5.
    发明公开
    Transmission power control method for a wireless communication system 有权
    übertragungsleistungsregelungsverfahrenfürein drahtloses社区系统

    公开(公告)号：EP2426828A2

    公开(公告)日：2012-03-07

    申请号：EP11177310.7

    申请日：2002-11-05

    申请人： Hitachi Ltd.

    发明人： Yano, Takashi ,  Tamaki, Satoshi

    IPC分类号： H04B7/005 ,  H04L1/00 ,  H04W52/08 ,  H04W52/24

    CPC分类号： H04W52/243 ,  H04W52/242 ,  H04W52/247 ,  H04W52/50

    摘要： Transmission power relative to a propagation path having a variation in gain is controlled to increase communication channel capacity, and a data rate is controlled in accordance with the variation of the increased communication channel capacity. In order to increase the communication channel capacity, the transmission power is determined so that the sum of noise power (= received noise power / propagation path gain) converted into one at a transmitter and the transmission power becomes constant. As a result, contrary to the background art, the transmission power is controlled to be reduced when the propagation path gain decreases and to be increased when the propagation path gain increases.

    摘要翻译： 控制相对于具有增益变化的传播路径的传输功率以增加通信信道容量，并且根据增加的通信信道容量的变化来控制数据速率。 为了增加通信信道容量，确定发送功率，使得在发送机转换为一个的发送功率和发送功率的噪声功率（=接收噪声功率/传播路径增益）的和变为恒定。 结果，与背景技术相反，当传播路径增益减小时，传输功率被控制为减小，并且当传播路径增益增加时传输功率被增加。

    Systems and methods for wireless communication
    6.
    发明公开
    Systems and methods for wireless communication 有权
    Systeme und Verfahren zur drahtlosen Kommunikation

    公开(公告)号：EP1863304A1

    公开(公告)日：2007-12-05

    申请号：EP07008981.8

    申请日：2007-05-03

    申请人： Hitachi, Ltd.

    发明人： Murai, Shinji ,  Ishifuji, Tomoaki ,  Yano, Takashi ,  Shida, Masaaki ,  Hayase, Shigenori

    IPC分类号： H04Q7/36

    CPC分类号： H04W72/085 ,  H04W28/18 ,  H04W72/046

    摘要： In a wireless communication system (FIG. 1) for communicating with a plurality of stations (103) at the same point of time with the same frequency using a Space Division Multiple Access (SDMA), wireless resources are allocated by a first decision unit (206-c) which evaluates performance of each station obtained when the SDMA is used and which determines periods of time to be allocated to groups of stations formed according to the SDMA technique. Using a first evaluation unit (206-a) and a second evaluation unit (206-b) to evaluate performance required by each station and each application, the first decision unit allocates the wireless resources to the stations. It is therefore possible that the wireless resources are efficiently allocated to the stations while preventing an event in which the wireless resources are excessive or insufficient for required quality of service (QoS; FIG. 7).

    摘要翻译： 在用于使用空分多址（SDMA）以相同频率在同一时间点与多个站（103）进行通信的无线通信系统（图1）中，无线资源由第一决策单元 206-c），其评估当使用SDMA时获得的每个站的性能，并且确定要分配给根据SDMA技术形成的站组的时间段。 使用第一评估单元（206-a）和第二评估单元（206-b）来评估每个站点和每个应用所要求的性能，第一决策单元向站点分配无线资源。 因此，可以将无线资源有效地分配给站，同时防止无线资源过多或不足以满足所需服务质量（QoS;图7）的事件。

    A cell search method and a base station for a code division multiple access mobile communication system
    7.
    发明公开
    A cell search method and a base station for a code division multiple access mobile communication system 有权
    一种码分多址移动通信系统的小区搜索方法和基站

    公开(公告)号：EP1473854A2

    公开(公告)日：2004-11-03

    申请号：EP04017498.9

    申请日：1999-02-26

    申请人： Hitachi, Ltd.

    发明人： Suzuki, May ,  Doi, Nobukazu ,  Yano, Takashi

    IPC分类号： H04B7/26

    CPC分类号： H04B1/70735 ,  H04B1/7075 ,  H04B1/708 ,  H04B1/7083 ,  H04B7/2628 ,  H04B7/2668

    摘要： The present invention relates to a cell search method for a code division multiple access mobile communication system, comprising:

    transmitting, from a base station, a control signal via perch channels (106, 107), said perch channels being formed such that a long period code assigned to said base station and a first short period code are mapped in a first section (102) of one slot of said perch channel; and
    transmitting, from said base station, a predetermined short period code mapped in a second section (131) of said one slot.

    Said predetermined short period code is provided for use by a mobile terminal for performing cell search by calculating a correlation value for said second section of said one slot.
    Said predetermined short period code is transmitted plural times within said second section of said one slot.

    摘要翻译： 本发明涉及一种用于码分多址移动通信系统的小区搜索方法，包括：经由导频信道（106,107）从基站发送控制信号，所述导频信道被形成为使得长周期 分配给所述基站的代码和第一短周期代码被映射到所述共用信道的一个时隙的第一部分（102）中; 以及从所述基站发射映射在所述一个时隙的第二部分（131）中的预定短周期代码。 所述预定短周期代码被提供供移动终端用于通过计算所述一个时隙的所述第二部分的相关值来执行小区搜索。 所述预定短周期代码在所述一个时隙的所述第二部分内被多次传输。

    Code division multiple access mobile communication system
    8.
    发明公开
    Code division multiple access mobile communication system 失效
    手机Kodemehrfachzugriffsübertragungssystem

    公开(公告)号：EP0762666A3

    公开(公告)日：2003-08-06

    申请号：EP96114399.7

    申请日：1996-09-09

    申请人： Hitachi, Ltd.

    发明人： Ohgoshi, Yasuo ,  Yano, Takashi ,  Doi, Nobukazu

    IPC分类号： H04B1/707 ,  H04B7/26 ,  H04L27/00

    CPC分类号： H04B1/707 ,  H04B7/2628

    摘要： A code division multiple access (CDMA) mobile communication system with improvements to permit stable reception with a minimum of bit error. The system comprises a voltage-controlled oscillator (63) for supplying a carrier to a radio frequency quadrature demodulator (57), and a frequency controller (70) for detecting a frequency error from a phase correction signal of the first step to generate a control signal that controls the oscillator (63). The frequency controller (70) includes an extracting circuit and an integrating circuit. The extracting circuit extracts a phase change based on the frequency error derived from the phase correction signal of the first step and from a signal preceding that signal by a predetermined delay time. The integrating circuit integrates the phase change and outputs the integrated result as the control signal. The predetermined delay time is preferably set within a range not exceeding the delay time needed for averaging by an averaging circuit that receives the phase correction signal of the first step and outputs a phase correction signal. The carrier to a radio frequency quadrature modulator (66) is preferably supplied from the voltage-controlled oscillator (63).

    Mobile station for CDMA mobile communication system and detection method of the same
    9.
    发明公开
    Mobile station for CDMA mobile communication system and detection method of the same 失效
    用于CDMA移动通信系统的移动台及其检测方法

    公开(公告)号：EP0693830A2

    公开(公告)日：1996-01-24

    申请号：EP95110927.1

    申请日：1995-07-12

    申请人： HITACHI, LTD.

    发明人： Ohgoshi, Yasuo ,  Doi, Nobukazu ,  Yano, Takashi

    IPC分类号： H04B7/26

    CPC分类号： H04B1/707

    摘要： A mobile station of a code division multiple access mobile communication system for transmission by carrying out quadrature multiplexing of a pilot signal and a data signal having I and Q components spread by spectrum from the base station to the mobile station, includes a despreading circuit (21) for generating phase error signals (ΔI, ΔQ) by despreading the quadrature multiplexed reception signals (I', Q') (1) by using spreading codes for pilot symbol, another spreading circuit (42) for generating a data signal group (12) by despreading the reception signals (1) by using spreading codes for data symbol, accumulators (41, 44) for converting the transmission rate of the phase error signals and the data signal group into the symbol rate, an averaging circuit (43) for generating phase correction signals (24) from the phase error signals of the symbol rate, and a phase correction circuit (49) for generating data signals (I, Q) (35) with the phase shifts being removed therefrom, by correcting the data signal group by the phase correction signals (24).

    摘要翻译： 一种码分多址移动通信系统的移动站，通过对导频信号和具有通过频谱从基站扩展到移动站的I和Q分量的数据信号进行正交复用来进行发送，该移动站包括解扩电路（21 ）用于通过使用用于导频符号的扩展码对正交多路复用接收信号（I'，Q'）（1）进行解扩来产生相位误差信号（ΔI，ΔQ），另一个用于产生数据信号组（12）的扩展电路（42） ）通过使用用于数据符号的扩展码对接收信号（1）进行解扩展，用于将相位误差信号和数据信号组的传输速率转换为符号速率的累加器（41,44），平均电路（43） 从码元速率的相位误差信号中产生相位校正信号（24）;以及一个相位校正电路（49），用于通过相应的方法产生数据信号（I，Q）（35） 通过相位校正信号（24）接通数据信号组。

    Mobile radio communication system with traffic distribution control by varying the cell sizes
    10.
    发明公开
    Mobile radio communication system with traffic distribution control by varying the cell sizes 失效
    Mobilfunksystem mit Verkehrsverteilungssteuerung durchÄnderungderZellengrösse。

    公开(公告)号：EP0615395A1

    公开(公告)日：1994-09-14

    申请号：EP94103429.0

    申请日：1994-03-07

    申请人： HITACHI, LTD.

    发明人： Doi, Nobukazu ,  Yano, Takashi

    IPC分类号： H04Q7/36 ,  H04B7/26

    CPC分类号： H04W16/06 ,  H04W16/08 ,  H04W16/24 ,  H04W52/325 ,  H04W52/46

    摘要： A cellular mobile communication system includes a plurality of base stations connected to a relay station (803), each base station having adaptability for coping with change in traffic volume within a relevant cell covered thereby. The relay station issues a command for lowering the power gain for the base station which covers a traffic-congested cell (800d) while raising the power gain for the base stations covering the neighboring cells, to thereby reducing the size of the traffic-congested cell (800d).

    摘要翻译： 蜂窝移动通信系统包括连接到中继站（803）的多个基站，每个基站具有适应性，以应付由此覆盖的相关小区内的业务量变化。 中继站发出用于降低覆盖交通拥堵小区（800d）的基站的功率增益的命令，同时提高覆盖相邻小区的基站的功率增益，从而减少交通拥塞小区的大小 （800D）。