公开(公告)号：US06597922B1

公开(公告)日：2003-07-22

申请号：US09312262

申请日：1999-05-14

申请人： Fuyun Ling ,  Jack Holtzman ,  Charles E. Wheatley, III ,  Tao Chen ,  Edward G. Tiedemann ,  Gilbert Leung

发明人： Fuyun Ling ,  Jack Holtzman ,  Charles E. Wheatley, III ,  Tao Chen ,  Edward G. Tiedemann ,  Gilbert Leung

IPC分类号： H04B700

CPC分类号： H04W52/225 ,  H04W36/0094 ,  H04W52/40 ,  H04W52/42

摘要： A method and apparatus for efficient candidate frequency search while initiating a handoff in a code division multiple access communication system. The method includes when the pilot signal is transmitted by the mobile station that is power controlled to a target receive level, the traffic channel power level is increased relative to the pilot channel to improve receiver performance. An improved feature is that the received pilot received at the base station stays the same while the receiver receives extra energy in the redundant traffic symbols received to enhance the probability of correctly decoding the received frame. The base station detects the absence of the mobile station transmitted signal from the frequency of interest. If the base station is aware of the starting time and duration of the absence, it can focus its detection during this predetermined time period. The performance can be improved if the absence of the signal is spread across two frames at the frame boundary.

摘要翻译： 一种用于在码分多址通信系统中发起切换的有效候选频率​​搜索的方法和装置。 该方法包括当导频信号由被功率控制到目标接收电平的移动台发送时，业务信道功率电平相对于导频信道增加，以提高接收机性能。 改进的特征是在基站处接收到的接收到的导频保持相同，而接收机在接收到的冗余业务符号中接收到额外的能量以增强正确解码接收帧的概率。 基站从感兴趣的频率检测到不存在移动台发送的信号。 如果基站知道不存在的起始时间和持续时间，则可以在该预定时间段内集中其检测。 如果没有信号在帧边界的两个帧上扩展，则可以提高性能。

公开(公告)号：US06810254B2

公开(公告)日：2004-10-26

申请号：US09946910

申请日：2001-09-04

申请人： Edward G. Tiedemann, Jr. ,  Tao Chen ,  Charles E. Wheatley, III

发明人： Edward G. Tiedemann, Jr. ,  Tao Chen ,  Charles E. Wheatley, III

IPC分类号： H04Q722

CPC分类号： H04W36/0094 ,  H04W36/0061 ,  H04W36/0066 ,  H04W36/14 ,  H04W36/30 ,  Y02D70/00

摘要： A method and apparatus for performing inter-system hard handoff between communication systems or inter-frequency hard handoff within a CDMA communication system is disclosed. The purpose is to reduce the probability of dropped calls during inter-system hard handoff. In the event that a hard handoff attempt is unsuccessful, the mobile station will return to the original system with information which the communication system of the present invention uses to assist in the performance of future handoff attempts. Alternatively, with no handoff attempt made, the mobile station monitors the destination system then returns to the original system with information used to assist in subsequent handoff attempts. The information returned from monitoring a CDMA system consists of results of a search for one or more pilots given at offsets in a specific list provided to the mobile station by the base station or a set of offsets based upon a predetermined search algorithm.

公开(公告)号：US5940761A

公开(公告)日：1999-08-17

申请号：US784280

申请日：1997-01-15

申请人： Edward G. Tiedemann, Jr. ,  Tao Chen ,  Charles E. Wheatley, III

发明人： Edward G. Tiedemann, Jr. ,  Tao Chen ,  Charles E. Wheatley, III

IPC分类号： H04L12/28 ,  H04W36/14 ,  H04Q7/20

CPC分类号： H04W36/0094 ,  H04W36/0066 ,  H04W36/0061 ,  H04W36/14 ,  H04W36/30

摘要： A method and apparatus for performing inter-system hard handoff between communication systems or inter-frequency hard handoff within a CDMA communication system is disclosed. The purpose of this invention is to reduce the probability of dropped calls during inter-system hard handoff. In the event that a hard handoff attempt is unsuccessful, the mobile station will return to the original system with information which the communication system of the present invention uses to assist in the performance of future handoff attempts. Alternatively, with no handoff attempt made, the mobile station monitors the destination system then returns to the original system with information used to assist in subsequent handoff attempts. The information returned from monitoring a CDMA system consists of results of a search for one or more pilots given at offsets in a specific list provided to the mobile station by the base station or a set of offsets based upon a predetermined search algorithm.

公开(公告)号：US06304755B1

公开(公告)日：2001-10-16

申请号：US09307878

申请日：1999-05-10

申请人： Edward G. Tiedemann, Jr. ,  Tao Chen ,  Charles E. Wheatley, III

发明人： Edward G. Tiedemann, Jr. ,  Tao Chen ,  Charles E. Wheatley, III

IPC分类号： H04Q738

CPC分类号： H04W36/0094 ,  H04W36/0061 ,  H04W36/0066 ,  H04W36/14 ,  H04W36/30 ,  Y02D70/00

摘要： A method and apparatus for performing inter-system hard handoff between communication systems or inter-frequency hard handoff within a CDMA communication system is disclosed. The purpose of this invention is to reduce the probability of dropped calls during inter-system hard handoff. In the event that a hard handoff attempt is unsuccessful, the mobile station will return to the original system with information which the communication system of the present invention uses to assist in the performance of future handoff attempts. Alternatively, with no handoff attempt made, the mobile station monitors the destination system then returns to the original system with information used to assist in subsequent handoff attempts. The information returned from monitoring a CDMA system consists of results of a search for one or more pilots given at offsets in a specific list provided to the mobile station by the base station or a set of offsets based upon a predetermined search algorithm.

摘要翻译： 公开了一种用于在CDMA通信系统内进行通信系统之间的系统间硬切换或频间硬切换的方法和装置。 本发明的目的是降低在系统间硬切换期间掉话的可能性。 在硬切换尝试不成功的情况下，移动台将利用本发明的通信系统用于协助未来切换尝试的执行的信息返回到原始系统。 或者，在没有进行切换尝试的情况下，移动台监视目的地系统，然后利用用于辅助随后的切换尝试的信息返回到原始系统。 从监视CDMA系统返回的信息包括搜索由基站提供给移动台的特定列表中的偏移处给出的一个或多个导频的结果或基于预定搜索算法的一组偏移量的结果。

公开(公告)号：US20100093387A1

公开(公告)日：2010-04-15

申请号：US12636497

申请日：2009-12-11

申请人： Tao Chen ,  Jack M. Holtzman ,  Fuyun Ling ,  Keith Saints ,  Nagabhushana Sindhushayana ,  Charles E. Wheatley, III

发明人： Tao Chen ,  Jack M. Holtzman ,  Fuyun Ling ,  Keith Saints ,  Nagabhushana Sindhushayana ,  Charles E. Wheatley, III

IPC分类号： H04B7/00 ,  H04B17/00

CPC分类号： H04W52/12 ,  H04L1/0051 ,  H04L1/0066 ,  H04L1/208 ,  H04W52/20 ,  H04W52/36

摘要： Techniques to adjust the setpoint of a power control loop in a wireless communication system. The setpoint may be adjusted based on frame status indicative of erased/good decoded frames, one or more (typically soft) metrics indicative of the confidence in the decoded results, power surplus/deficit indicative of the difference between the received signal quality and the setpoint, setpoint surplus/deficit indicative of the difference between the setpoint and a threshold Eb/Nt needed for the desired level of performance, or a combination thereof. The metrics may include re-encoded symbol error rate, re-encoded power metric, modified Yamamoto metric, minimum or average LLR among decoded bits, number of decoding iterations, and possibly others. The setpoint may be adjusted in different manners and/or by different amounts depending on the above-noted factors. The techniques may be employed for forward and/or reverse links in CDMA systems.

摘要翻译： 调整无线通信系统中功率控制回路设定值的技术。 可以基于指示擦除/良好解码帧的帧状态来调整设定点，指示解码结果的置信度的一个或多个（通常为软）度量，指示接收信号质量与设定点之间的差异的功率余量/ ，表示设定值与所需性能水平所需的阈值Eb / Nt之间的差异的设定值剩余/缺失，或其组合。 度量可以包括重新编码的符号错误率，重新编码的功率度量，修改的Yamamoto度量，解码比特中的最小或平均LLR，解码迭代次数，以及可能的其他值。 可以根据上述因素以不同的方式和/或不同的量调节设定点。 这些技术可以用于CDMA系统中的前向和/或反向链路。

公开(公告)号：US06763244B2

公开(公告)日：2004-07-13

申请号：US09810685

申请日：2001-03-15

申请人： Tao Chen ,  Jack M. Holtzman ,  Fuyun Ling ,  Keith Saints ,  Nagabhushana Sindhushayana ,  Charles E. Wheatley, III

发明人： Tao Chen ,  Jack M. Holtzman ,  Fuyun Ling ,  Keith Saints ,  Nagabhushana Sindhushayana ,  Charles E. Wheatley, III

IPC分类号： H04B116

CPC分类号： H04W52/12 ,  H04L1/0051 ,  H04L1/0066 ,  H04L1/208 ,  H04W52/20 ,  H04W52/36

摘要： Techniques to adjust the setpoint of a power control loop in a wireless communication system. The setpoint may be adjusted based on frame status indicative of erased/good decoded frames, one or more (typically soft) metrics indicative of the confidence in the decoded results, power surplus/deficit indicative of the difference between the received signal quality and the setpoint, setpoint surplus/deficit indicative of the difference between the setpoint and a threshold Eb/Nt needed for the desired level of performance, or a combination thereof. The metrics may include re-encoded symbol error rate, re-encoded power metric, modified Yamamoto metric, minimum or average LLR among decoded bits, number of decoding iterations, and possibly others. The setpoint may be adjusted in different manners and/or by different amounts depending on the above-noted factors. The techniques may be employed for forward and/or reverse links in CDMA systems.

摘要翻译： 调整无线通信系统中功率控制回路设定值的技术。 可以基于指示擦除/良好解码帧的帧状态来调整设定点，指示解码结果的置信度的一个或多个（通常为软）度量，指示接收信号质量与设定点之间的差异的功率余量/ ，表示设定值与所需性能水平所需的阈值Eb / Nt之间的差异的设定值剩余/缺失，或其组合。 度量可以包括重新编码的符号错误率，重新编码的功率度量，修改的Yamamoto度量，解码比特中的最小或平均LLR，解码迭代次数，以及可能的其他值。 可以根据上述因素以不同的方式和/或不同的量调节设定点。 这些技术可以用于CDMA系统中的前向和/或反向链路。

公开(公告)号：US07643842B2

公开(公告)日：2010-01-05

申请号：US10889808

申请日：2004-07-12

申请人： Tao Chen ,  Jack M. Holtzman ,  Fuyun Ling ,  Keith Saints ,  Nagabhushana Sindhushayana ,  Charles E. Wheatley, III

发明人： Tao Chen ,  Jack M. Holtzman ,  Fuyun Ling ,  Keith Saints ,  Nagabhushana Sindhushayana ,  Charles E. Wheatley, III

IPC分类号： H04B1/16 ,  H04W52/18

CPC分类号： H04W52/12 ,  H04L1/0051 ,  H04L1/0066 ,  H04L1/208 ,  H04W52/20 ,  H04W52/36

摘要： Techniques to adjust the setpoint of a power control loop in a wireless communication system. The setpoint may be adjusted based on frame status indicative of erased/good decoded frames, one or more (typically soft) metrics indicative of the confidence in the decoded results, power surplus/deficit indicative of the difference between the received signal quality and the setpoint, setpoint surplus/deficit indicative of the difference between the setpoint and a threshold Eb/Nt needed for the desired level of performance, or a combination thereof. The metrics may include re-encoded symbol error rate, re-encoded power metric, modified Yamamoto metric, minimum or average LLR among decoded bits, number of decoding iterations, and possibly others. The setpoint may be adjusted in different manners and/or by different amounts depending on the above-noted factors. The techniques may be employed for forward and/or reverse links in CDMA systems.

摘要翻译： 调整无线通信系统中功率控制回路设定值的技术。 可以基于指示擦除/良好解码帧的帧状态来调整设定点，指示解码结果的置信度的一个或多个（通常是软的）度量，指示接收到的信号质量和设定点之间的差异的功率余量/ ，表示设定值与所需性能水平所需的阈值Eb / Nt之间的差异的设定值剩余/缺失，或其组合。 度量可以包括重新编码的符号错误率，重新编码的功率度量，修改的Yamamoto度量，解码比特中的最小或平均LLR，解码迭代次数，以及可能的其他值。 可以根据上述因素以不同的方式和/或不同的量调节设定点。 这些技术可以用于CDMA系统中的前向和/或反向链路。

公开(公告)号：US06373823B1

公开(公告)日：2002-04-16

申请号：US09239454

申请日：1999-01-28

申请人： Tao Chen ,  Jack M. Holtzman ,  Keith Saints ,  Charles E. Wheatley, III ,  Fuyun Ling ,  Nagabhushana Sindhushayana

发明人： Tao Chen ,  Jack M. Holtzman ,  Keith Saints ,  Charles E. Wheatley, III ,  Fuyun Ling ,  Nagabhushana Sindhushayana

IPC分类号： H04J314

CPC分类号： H04W52/12 ,  H04W52/08 ,  H04W52/20 ,  H04W52/44

摘要： A power control system for controlling the transmission power in a system wherein the transmission power may be gated or capped. The receiver employs a combination of closed loop and outer loop power control. The outer loop is frozen upon detection by the receiver that the signal has been capped or gated.

摘要翻译： 一种用于控制系统中的发射功率的功率控制系统，其中发射功率可以选通或加盖。 接收机采用闭环和外环功率控制的组合。 接收机检测到外部环路信号已被封顶或门控时被冻结。

公开(公告)号：US07391759B2

公开(公告)日：2008-06-24

申请号：US10383855

申请日：2003-03-07

申请人： Mark S. Wallace ,  Edward G. Tiedemann, Jr. ,  Charles E. Wheatley, III ,  J. Rod Walton ,  Steven J. Howard

发明人： Mark S. Wallace ,  Edward G. Tiedemann, Jr. ,  Charles E. Wheatley, III ,  J. Rod Walton ,  Steven J. Howard

IPC分类号： H04J3/06

CPC分类号： H04B7/2696

摘要： When insufficient traffic is present in the network to maintain synchronization in this manner, other methods must be used. One approach involves making direct measurements of the timing between base stations. This is accomplished in one of two ways. The base may interrupt its transmissions on all sectors for a short interval during which it determines the time of arrival of signals from other base stations. Given knowledge of the other base station locations, time errors relative to all other base stations may be derived. Alternatively, the base may send a short signal at high power in the mobile transmit band. This time-of-arrival of this signal is measured by the surrounding base stations and the time errors between pairs of base stations are computed. In some cases, a base station may be isolated sufficiently from all other base stations in the network such that direct base-to-base measurement is not viable. In this case, a fixed mobile is placed at a location in the handoff region between the isolated cell and another cell in the network. The fixed mobile either performs measurements of base station pilots on command of the base and reports the timing information, or sends a burst transmission at a specified time and power level to be measured by the base stations.

摘要翻译： 当网络中不足够的流量以这种方式维持同步时，必须使用其他方法。 一种方法包括对基站之间的定时进行直接测量。 这是通过两种方式之一实现的。 基站可以在所有扇区上中断其传输短时间间隔，在此期间它确定来自其他基站的信号的到达时间。 鉴于其他基站位置的知识，可以导出相对于所有其他基站的时间误差。 或者，基站可以在移动发射频带中以高功率发送短信号。 该信号的到达时间由周围的基站测量，并且计算基站对之间的时间误差。 在一些情况下，基站可以与网络中的所有其他基站充分隔离，使得直接基站到基站的测量是不可行的。 在这种情况下，固定移动台被放置在隔离小区与网络中的另一小区之间的切换区域中的位置。 固定移动台可以在基站的指令下执行基站导频的测量，并且报告定时信息，或者在由基站测量的指定时间和功率电平上发送突发传输。

公开(公告)号：US06381230B1

公开(公告)日：2002-04-30

申请号：US09123495

申请日：1998-07-28

申请人： Charles E. Wheatley, III ,  Edward G. Tiedemann, Jr. ,  Joseph P. Odenwalder ,  Rajeev Krishnamurthi

发明人： Charles E. Wheatley, III ,  Edward G. Tiedemann, Jr. ,  Joseph P. Odenwalder ,  Rajeev Krishnamurthi

IPC分类号： H04Q700

CPC分类号： H04W16/16 ,  H04W84/042 ,  H04W84/105 ,  H04W88/04 ,  H04W88/06 ,  H04W88/08

摘要： A method and system for operation of a personal base station where the forward link of a personal base station is on the same frequency assignment as a first forward link data signal transmitted by a macro base station belonging to a cellular communication system. A first subscriber station communicates with the macro base station. The personal base station generates a second forward link data signal and communicates with a second subscriber station. The personal base station receives the first forward link data signal and combines it with its own second forward link data signal to form a combined forward link data signal. The personal base station then transmits the combined forward link data signal. The first subscriber station is able to receive and diversity combine the combined forward link data signal, improving the signal to noise ratio that would otherwise occur in the vicinity of the personal base station.

摘要翻译： 一种用于个人基站的操作的方法和系统，其中个人基站的前向链路与属于蜂窝通信系统的宏基站发送的与第一前向链路数据信号相同的频率分配。 第一用户站与宏基站进行通信。 个人基站产生第二前向链路数据信号并与第二用户台进行通信。 个人基站接收第一前向链路数据信号并将其与其自己的第二前向链路数据信号组合，以形成组合的前向链路数据信号。 然后，个人基站发送组合的前向链路数据信号。 第一用户台能够接收并分集组合前向链路数据信号，从而提高否则将发生在个人基站附近的信噪比。