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    Method for accessing a cell using two pilot channels in a CDMA communication system of an asynchronous or quasi-synchronous mode
    142.
    发明授权
    Method for accessing a cell using two pilot channels in a CDMA communication system of an asynchronous or quasi-synchronous mode 失效
    在异步或准同步模式的CDMA通信系统中使用两个导频信道访问小区的方法

    公开(公告)号：US06205132B1

    公开(公告)日：2001-03-20

    申请号：US08803995

    申请日：1997-02-21

    Applicant: Een Kee Hong ,  Dong Ho Kim ,  Yeon Dae Yang ,  Byeong Chul Ahn ,  Yong Wan Park ,  Seong Moon Ryu ,  Tae Young Lee ,  An Na Choi

    Inventor： Een Kee Hong ,  Dong Ho Kim ,  Yeon Dae Yang ,  Byeong Chul Ahn ,  Yong Wan Park ,  Seong Moon Ryu ,  Tae Young Lee ,  An Na Choi

    IPC: H04B7216

    CPC classification number: H04B1/70775 ,  H04B1/7083 ,  H04B2201/70701 ,  H04B2201/70702

    Abstract: The present invention discloses a method for accessing a cell, and more particularly, to a method for acquiring an initial synchronization using two pilot channels in a CDMA (Code Division Multiple Access) communication system of an asynchronous or quasi-synchronous mode. In accordance with the present invention, a CDMA communication system of an quasi-synchronous mode comprises the steps of synchronizing the mobile station with a cluster pilot, and searching for cell pilots on the basis of the cluster synchronization channel set up by the cluster pilot, and synchronizing the mobile station with the cell pilot having a maximum sensitivity, whereby the mobile station is synchronized with the base station through the cluster pilot and the cell pilot. Also, in accordance with the present invention, a CDMA communication system of a asynchronous mode comprises the steps of synchronizing the mobile station with a cluster pilot, and searching for all cell pilots in a cluster of which synchronization has been set up by the cluster pilot, and synchronizing the mobile station with the cell pilot having a maximum sensitivity, whereby the mobile station is synchronized with the base station through the cluster pilot and the cell pilot.

    Abstract translation: 本发明公开了一种用于访问小区的方法，更具体地说，涉及一种用于在异步或准同步模式的CDMA（码分多址）通信系统中使用两个导频信道获取初始同步的方法。 根据本发明，准同步模式的CDMA通信系统包括以下步骤：根据由集群导频设置的集群同步信道，同步移动台与群集导频，并搜索小区导频， 并使移动台与具有最大灵敏度的小区导频同步，由此移动台通过群集导频和小区导频与基站同步。 此外，根据本发明，异步模式的CDMA通信系统包括以下步骤：使移动站与群集导频同步，并且搜索群集中已经由群集导频建立的同步的群集中的所有小区导频 并且使移动台与具有最大灵敏度的小区导频同步，由此移动台通过群集导频和小区导频与基站同步。

    Apparatus and method of establishing and maintaining communication paths in a wireless telecommunications system
    143.
    发明授权
    Apparatus and method of establishing and maintaining communication paths in a wireless telecommunications system 失效
    在无线电信系统中建立和维护通信路径的装置和方法

    公开(公告)号：US06175560B1

    公开(公告)日：2001-01-16

    申请号：US08973581

    申请日：1998-03-16

    Applicant: Shashikant Bhagalia ,  Joemanne Chi Cheung Yeung ,  Ian L. Cooper ,  Martin Lysejko ,  Guy A. Cooper ,  Jonathan A. Thompson

    Inventor： Shashikant Bhagalia ,  Joemanne Chi Cheung Yeung ,  Ian L. Cooper ,  Martin Lysejko ,  Guy A. Cooper ,  Jonathan A. Thompson

    IPC: H04B7216

    CPC classification number: H04J13/00 ,  H04B1/707 ,  H04B1/70735 ,  H04B1/7075 ,  H04B1/7077 ,  H04B1/70775 ,  H04B2201/70702 ,  H04L41/0226 ,  H04L41/0233 ,  H04L41/0654 ,  H04L41/0681 ,  H04L41/22 ,  H04W52/08 ,  H04W52/50 ,  H04W84/14

    Abstract: A wireless telecommunications systems (1) includes a central terminal (10) for transmitting and receiving radio frequency signals to and from a subscriber terminal (20). A downlink communication path is established from a transmitter (200) of the central terminal (10) to a receiver (202) of the subscriber terminal (20). A downlink signal (212) is transmitted from the transmitter (200) to the receiver (202) during setup and operation of the wireless telecommunications system (1). The receiver (202) of the subscriber terminal (20) compares a code and phase of a master code sequence that includes an orthogonal code in the downlink signal (212) to a code and phase of a slave code sequence of the receiver (202). The receiver (202) adjusts the phase of the slave code sequence until a match is obtained with the master code sequence. The receiver (202) monitors the downlink signal (212) to identify the frame alignment signal (232) and establishes the downlink communication path when two successive frame alignment signals (232) are identified. A channel identifier signal within the downlink signal is identified and used to identify the orthogonal code included in the master code sequence. The channel identifier signal is matched to a reference identifier code to verify that the correct downlink signal is being read.

    Abstract translation: 无线电信系统（1）包括用于向和从用户终端（20）发送和接收射频信号的中央终端（10）。 从中心终端（10）的发射机（200）到用户终端（20）的接收机（202）建立下行链路通信路径。 在无线电信系统（1）的建立和操作期间，从发射机（200）向接收机（202）发送下行链路信号（212）。 用户终端（20）的接收机（202）将包括下行链路信号（212）中的正交码的主码序列的码和相位与接收机（202）的从属码序列的码和相位进行比较， 。 接收器（202）调整从代码序列的相位，直到用主代码序列获得匹配。 接收器（202）监视下行链路信号（212）以识别帧对准信号（232），并且当识别出两个连续的帧对准信号（232）时建立下行链路通信路径。 识别下行链路信号内的信道标识符信号，并用于识别包含在主码序列中的正交码。 信道标识符信号与参考标识符码匹配，以验证正在读取正确的下行链路信号。

    Method and system for generating and using synchronized and unsynchronized spread spectrum signals in a cellular communications system
    144.
    发明授权
    Method and system for generating and using synchronized and unsynchronized spread spectrum signals in a cellular communications system 失效
    用于在蜂窝通信系统中生成和使用同步和非同步扩频信号的方法和系统

    公开(公告)号：US06157631A

    公开(公告)日：2000-12-05

    申请号：US3975

    申请日：1998-01-07

    Applicant: Kamyar Rohani

    Inventor： Kamyar Rohani

    IPC: H04B1/7077 ,  H04B1/7083 ,  H04L7/04 ,  H04B1/69 ,  H04J3/06

    CPC classification number: H04B1/70775 ,  H04B1/7083 ,  H04B2201/70701 ,  H04B2201/70702 ,  H04L7/041

    Abstract: In a cellular communications system having synchronized base stations and unsynchronized base stations, wherein the synchronized base stations are synchronized to system time and have a common pilot PN sequence used for all synchronized pilot channels, a marker sequence is selected. The selected marker sequence is comprised of an M-chip portion of the common pilot PN sequence. Next, a coded portion of an unsynchronized pilot PN sequence is generated wherein the coded portion identifies a selected unsynchronized base station. The marker sequence and the coded portion of the unsynchronized pilot PN sequence are combined to form the unsynchronized pilot PN sequence that is different from the common pilot PN sequence. Thereafter, an unsynchronized pilot channel baseband signal of an unsynchronized base station is spread with the unsynchronized pilot PN sequence to produce the unsynchronized pilot channel.

    Abstract translation: 在具有同步基站和非同步基站的蜂窝通信系统中，其中同步的基站与系统时间同步并且具有用于所有同步导频信道的公共导频PN序列，选择标记序列。 所选标记序列由公共导频PN序列的M片部分组成。 接下来，生成非同步导频PN序列的编码部分，其中编码部分标识所选择的不同步基站。 组合标记序列和非同步导频PN序列的编码部分以形成与公共导频PN序列不同的非同步导频PN序列。 此后，非同步的基站的不同步的导频信道基带信号与未同步的导频PN序列扩展以产生不同步的导频信道。

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