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    Method and apparatus for hard handoff in a CDMA system
    111.
    发明授权
    Method and apparatus for hard handoff in a CDMA system 失效
    用于CDMA系统中硬切换的方法和装置

    公开(公告)号：US5848063A

    公开(公告)日：1998-12-08

    申请号：US652742

    申请日：1996-05-23

    申请人： Lindsay A. Weaver, Jr. ,  David B. Munsinger ,  Roberto Padovani ,  Noam A. Ziv ,  Gadi Karmi ,  Klein S. Gilhousen

    发明人： Lindsay A. Weaver, Jr. ,  David B. Munsinger ,  Roberto Padovani ,  Noam A. Ziv ,  Gadi Karmi ,  Klein S. Gilhousen

    IPC分类号： H04W24/02 ,  H04W36/14 ,  H04Q7/00

    CPC分类号： H04W36/30 ,  H04W36/0083

    摘要： In a communications network, a network user communicates through a remote unit with another user via at least one base station. The communications network includes a first mobile switching center which controls communications through a first set of base stations including a first base station. The remote unit stores a list of active base stations which has an entry corresponding to each base station with which active communication is established. The first base station has an entry on the list of active base stations. The first base station measures a round trip delay of an active communication signal between the first base station and the remote unit. A handoff of the active communication signal is initiated if the round trip delay of the active communication exceeds a threshold if the first base station is designated as a reference base station. Alternatively, the remote unit also stores a list of candidate base stations comprising an entry corresponding to each base station through which active communication may be possible but is not established. A handoff of the active communication signal is initiated if the list of candidate base stations comprises an entry corresponding to a triggering pilot signal.

    摘要翻译： 在通信网络中，网络用户经由至少一个基站通过远程单元与另一用户进行通信。 通信网络包括第一移动交换中心，其通过包括第一基站的第一组基站来控制通信。 远程单元存储活动基站的列表，其具有对应于建立了主动通信的每个基站的条目。 第一个基站在活动基站列表中有一个条目。 第一基站测量第一基站和远程单元之间的活动通信信号的往返延迟。 如果第一基站被指定为参考基站，则主动通信的往返延迟超过阈值时，启动主动通信信号的越区切换。 或者，远程单元还存储候选基站的列表，其包括对应于每个基站的条目，活动通信可以通过该条目可能但不被建立。 如果候选基站的列表包括与触发导频信号相对应的条目，则启动主动通信信号的越区切换。

    Apparatus and method for reducing message collision between mobile stations simultaneously accessing a base station in a CDMA cellular communications system
    114.
    发明授权
    Apparatus and method for reducing message collision between mobile stations simultaneously accessing a base station in a CDMA cellular communications system 失效
    用于减少在CDMA蜂窝通信系统中同时访问基站的移动站之间的消息冲突的装置和方法

    公开(公告)号：US5544196A

    公开(公告)日：1996-08-06

    申请号：US219867

    申请日：1994-03-30

    申请人： Edward G. Tiedemann, Jr. ,  Lindsay A. Weaver, Jr. ,  Roberto Padovani

    发明人： Edward G. Tiedemann, Jr. ,  Lindsay A. Weaver, Jr. ,  Roberto Padovani

    IPC分类号： H04B1/707 ,  H04B1/7103 ,  H04B7/26 ,  H04J13/00 ,  H04J13/10 ,  H04J13/16 ,  H04L1/16 ,  H04L12/28 ,  H04L12/403 ,  H04L12/413 ,  H04L27/30 ,  H04W28/04 ,  H04W52/48 ,  H04W52/50 ,  H04W74/00 ,  H04W74/08 ,  H04B1/69 ,  H04J13/04

    CPC分类号： H04W74/0841 ,  H04B1/707 ,  H04B1/7103 ,  H04B7/2628 ,  H04J13/0022 ,  H04J13/10 ,  H04J13/16 ,  H04L1/1887 ,  H04W52/48 ,  H04W52/50 ,  H04W74/0833 ,  H04B2201/709709 ,  H04L1/188 ,  H04W74/002 ,  H04W74/08 ,  H04W74/0866 ,  Y02B60/50

    摘要： Collisions between messages simultaneously transmitted by multiple spread-spectrum transmitters are reduced by distributing the transmissions over the available resources of the receiver. The transmitters may be mobile stations and the receiver may be a base station in a CDMA cellular telephone system. Each mobile station uses one or more randomization methods to distribute its transmissions. In the first randomization, the mobile station time--delays its transmissions by a number of chips of the PN code with which it spreads the transmitted signal. A hash function produces the number from an identification number uniquely associated with that mobile station. In a second randomization, the mobile station randomly selects the PN code. In a third randomization, the mobile station inserts a random delay between successive message transmissions or probes if it does not receive an acknowledgement after a predetermined timeout period. A predetermined number of such transmissions is called a probe sequence. In a fourth randomization, the mobile station inserts a relatively long random delay between successive probe sequences if it does not receive an acknowledgement of any probe in the sequence. The noise level is reduced by minimizing transmission power. The mobile station increments the power of successive probes within each probe sequence. The first probe of each probe sequence is transmitted at a predetermined level.

    摘要翻译： 通过在接收机的可用资源上分发传输来减少由多个扩频发射机同时发送的消息之间的冲突。 发射机可以是移动台，并且接收机可以是CDMA蜂窝电话系统中的基站。 每个移动台使用一种或多种随机化方法来分发其传输。 在第一次随机化中，移动台通过PN码的多个码片对其发送进行时间延迟，并通过该芯片扩展发送的信号。 散列函数从与该移动站唯一相关联的识别号码产生数字。 在第二随机化中，移动台随机选择PN码。 在第三次随机化中，如果移动台在预定的超时时段之后没有接收到确认，则在连续的消息传输或探测之间插入随机延迟。 预定数量的这种传输被称为探测序列。 在第四随机化中，如果移动台在序列中没有接收到任何探测器的确认，则在连续探测序列之间插入相对长的随机延迟。 通过最小化传输功率降低噪声电平。 移动台在每个探测序列内递增连续探测的能力。 每个探针序列的第一探针以预定水平传输。

    Method and system for providing a soft handoff in communications in a CDMA cellular telephone system
    115.
    发明授权
    Method and system for providing a soft handoff in communications in a CDMA cellular telephone system 失效
    用于在CDMA蜂窝电话系统中提供通信中的软切换的方法和系统

    公开(公告)号：US5101501A

    公开(公告)日：1992-03-31

    申请号：US433030

    申请日：1989-11-07

    申请人： Klein S. Gilhousen ,  Roberto Padovani ,  Charles E. Wheatley, III

    发明人： Klein S. Gilhousen ,  Roberto Padovani ,  Charles E. Wheatley, III

    IPC分类号： H04B1/707 ,  H04W36/18

    CPC分类号： H04W36/18 ,  H04B2201/70701

    摘要： In a cellular telephone system a system for directing communications between a mobile user and cell-sites as a mobile user changes cell-site service areas. The mobile user includes an apparatus for, while in communication with another system user via one cell-site, determining a transition of the mobile user from the cell-site service area to the service area of another cell-site. The system includes circuitry responsive to the indication for coupling communications between the mobile user and the other system user via the new cell-site while the mobile user also remains in communication with the system user via the first cell-site. The system further includes apparatus responsive to the coupling of the communications between the mobile user and the other system user via the new cell-site for terminating the communications between the mobile user and another system user via cell-site with communications continuing between the mobile user and the system user via the new cell-site.

    摘要翻译： 在蜂窝电话系统中，作为移动用户指导移动用户与小区站点之间的通信的系统改变小区站点服务区域。 移动用户包括用于在经由一个小区站点与另一系统用户通信时确定移动用户从小区站点服务区域到另一小区站点的服务区域的转换的装置。 该系统包括响应于该指示的电路，用于通过新的小区站点来耦合移动用户与另一个系统用户之间的通信，同时移动用户也通过第一小区站点与系统用户保持通信。 该系统还包括响应于移动用户和另一个系统用户之间的通信的耦合，经由新的小区站点，用于经由小区站点终止移动用户与另一个系统用户之间的通信，该通信在移动用户之间继续进行 和系统用户通过新的小区站点。

    Method and apparatus for controlling transmission power in a CDMA cellular mobile telephone system
    116.
    发明授权
    Method and apparatus for controlling transmission power in a CDMA cellular mobile telephone system 失效
    用于控制CDMA蜂窝移动电话系统中的传输功率的方法和装置

    公开(公告)号：US5056109A

    公开(公告)日：1991-10-08

    申请号：US433031

    申请日：1989-11-07

    申请人： Klein S. Gilhousen ,  Roberto Padovani ,  Charles E. Wheatley, III

    发明人： Klein S. Gilhousen ,  Roberto Padovani ,  Charles E. Wheatley, III

    IPC分类号： H04B7/005 ,  H04B7/26 ,  H04W52/00 ,  H04W52/02 ,  H04W52/06 ,  H04W52/08 ,  H04W52/10 ,  H04W52/12 ,  H04W52/40 ,  H04W52/52

    CPC分类号： H04W52/0245 ,  H04W52/06 ,  H04W52/52 ,  H04W52/08 ,  H04W52/10 ,  H04W52/12 ,  H04W52/40 ,  Y02B60/50

    摘要： A power control system for a cellular mobile telephone system in which system users communicate information signals between one another via at least one cell site using code division multiple access spread spectrum communication signals. The power control system controls transmission signal power for each cellular mobile telephone in the cellular mobile telephone system wherein each cellular mobile telephone has an antenna, transmitter and receiver and each cell-site also has an antenna, transmitter and receiver. Cell-site transmitted signal power is measured as received at the mobile unit. Transmitter power is adjusted at the mobile unit in an opposite manner with respect to increases and decreases in received signal power. A power control feedback scheme may also be utilized. At the cell-site communicating with the mobile unit, the mobile unit transmitted power is measured as received at the cell-site. A command signal is generated at the cell-site and transmitted to the mobile unit for further adjusting mobile unit transmitter power corresponding to deviations in the cell site received signal power. The feedback scheme is used to further adjust the mobile unit transmitter power so as to arrive at the cell-site at a desired power level.

    摘要翻译： 一种用于蜂窝移动电话系统的功率控制系统，其中系统用户通过使用码分多址扩频通信信号的至少一个小区站点在彼此之间传送信息信号。 功率控制系统控制蜂窝移动电话系统中的每个蜂窝移动电话的传输信号功率，其中每个蜂窝移动电话具有天线，发射机和接收机，并且每个小区站点也具有天线，发射机和接收机。 在移动单元处测量接收到的站点发送信号功率。 相对于接收信号功率的增加和减少，发射机功率在移动单元处以相反的方式被调整。 还可以使用功率控制反馈方案。 在与移动单元通信的小区站点处，移动单元发送的功率在小区站点被接收到。 在小区站点生成指令信号，发送给移动单元，进一步调整与单元现场接收信号功率的偏差对应的移动单元发射机功率。 反馈方案用于进一步调整移动单元发射机功率，以便以期望的功率电平到达小区站点。

    Pilot reference transmission for a wireless communication system
    118.
    发明授权
    Pilot reference transmission for a wireless communication system 有权
    无线通信系统的导频参考传输

    公开(公告)号：US09118387B2

    公开(公告)日：2015-08-25

    申请号：US11858840

    申请日：2007-09-20

    申请人： Roberto Padovani ,  Peter J. Black ,  Nagabhushana T. Sindhushayana

    发明人： Roberto Padovani ,  Peter J. Black ,  Nagabhushana T. Sindhushayana

    IPC分类号： H04L12/28 ,  H04B7/26 ,  H04B1/707 ,  H04W52/32 ,  H04J1/16 ,  H04J3/06

    CPC分类号： H04B7/2687 ,  H04B1/707 ,  H04B2201/70701 ,  H04J3/0644 ,  H04W52/325

    摘要： A pilot reference transmission scheme well suited for high data rate wireless communication systems is disclosed. To maximize the amount of interference from transmissions from neighboring transmission sources (e.g., access points or base stations) during the pilot interval, and hence minimize the amount of interference from non-transmitting sources during the data intervals, the pilot references are transmitted in bursts at predetermined time intervals, and the pilot bursts from the access points are synchronized. This results in maximum interference contributions from non-transmitting neighboring access points, facilitating reliable estimation of worst case carrier-to-interference (C/I), and further allows the receiving devices (e.g., access terminals) to easily recognize the bursts as pilot reference. In one embodiment, each access point transmits the pilot bursts at or near its maximum transmit power level and no user-specific data is transmitted during the pilot bursts.

    摘要翻译： 公开了一种非常适合高数据速率无线通信系统的导频参考传输方案。 为了在导频间隔期间使来自相邻传输源（例如，接入点或基站）的传输的干扰量最大化，并且因此在数据间隔期间最小化来自非发射源的干扰量，导频参考以突发 并且来自接入点的导频突发是同步的。 这导致来自非发射相邻接入点的最大干扰贡献，促进对最差情况下的载波干扰（C / I）的可靠估计，并且还允许接收设备（例如，接入终端）容易地将突发识别为导频 参考。 在一个实施例中，每个接入点在其最大发射功率电平处或其附近发射导频脉冲串，并且在导频突发期间不发送用户特定数据。

    Method and apparatus for canceling pilot interference in a wireless communication system
    119.
    发明授权
    Method and apparatus for canceling pilot interference in a wireless communication system 有权
    用于消除无线通信系统中的导频干扰的方法和装置

    公开(公告)号：US08611311B2

    公开(公告)日：2013-12-17

    申请号：US11173504

    申请日：2005-06-30

    申请人： Alessandro Vanelli Coralli ,  Henry David Pfister ,  Jilei Hou ,  John Edward Smee ,  Roberto Padovani ,  Brian K Butler ,  Jeffrey A Levin ,  Thomas B Wilborn ,  Paul E Bender

    发明人： Alessandro Vanelli Coralli ,  Henry David Pfister ,  Jilei Hou ,  John Edward Smee ,  Roberto Padovani ,  Brian K Butler ,  Jeffrey A Levin ,  Thomas B Wilborn ,  Paul E Bender

    IPC分类号： H03D1/04

    CPC分类号： H04B1/7107 ,  H04B2201/70701

    摘要： Methods and systems for estimating and canceling pilot interference in a wireless (e.g., CDMA) communication system. In one method, a received signal comprised of a number of signal instances, each including a pilot, is initially processed to provide data samples. Each signal instance's pilot interference may be estimated by despreading the data samples with a spreading sequence for the signal instance, channelizing the despread data to provide pilot symbols, filtering the pilot symbols to estimate the channel response of the signal instance, and multiplying the estimated channel response with the spreading sequence. The pilot interference estimates due to a plurality of interfering multipaths are accumulated to derive the total pilot interference, which is subtracted from the data samples to provide pilot-canceled data samples. These samples are then processed to derive demodulated data for each of at least one (desired) signal instance in the received signal.

    摘要翻译： 用于估计和消除无线（例如，CDMA）通信系统中的导频干扰的方法和系统。 在一种方法中，最初处理包括多个信号实例（每个包括导频）的接收信号以提供数据样本。 每个信号实例的导频干扰可以通过用信号实例的扩展序列解扩数据样本来估计，对解扩数据进行信道化以提供导频符号，对导频符号进行滤波以估计信号实例的信道响应，并将估计信道 响应与扩展序列。 由多个干扰多径导致的导频干扰估计被累加以导出总导频干扰，其从数据样本中减去以提供导频取消的数据采样。 然后处理这些样本以便为接收信号中的至少一个（期望的）信号实例中的每一个导出解调数据。