公开(公告)号：US09049670B2

公开(公告)日：2015-06-02

申请号：US11969002

申请日：2008-01-03

申请人： Kumar Balachandran ,  Leonid Krasny

发明人： Kumar Balachandran ,  Leonid Krasny

IPC分类号： H04B7/00 ,  H04W52/26 ,  H04W52/14 ,  H04W52/34 ,  H04B7/06 ,  H04W52/24

CPC分类号： H04W52/267 ,  H04B7/024 ,  H04B7/0452 ,  H04B7/0617 ,  H04W24/02 ,  H04W52/146 ,  H04W52/241 ,  H04W52/34 ,  H04W72/0473

摘要： A base station maximizes an uplink data transmission rate from multiple mobiles treated by the base station as a virtual single uplink transmitter. The base station identifies a set of mobile stations as a candidate transmitting set and determines a transmit power allowable from the mobile stations in the candidate transmitting set. A subset of those mobile stations in the candidate transmitting set is identified. Uplink data transmission rates are assigned and communicated to the subset of mobile stations in the candidate transmitting set so as to optimize a total number of bits processed by the base station associated with the uplink transmissions received from the subset of candidate mobile stations. The optimization may accomplish one or more objectives in addition to optimizing the total number of bits processed.

摘要翻译： 基站将基站处理的多个移动台的上行链路数据传输速率最大化为虚拟单个上行链路发射机。 基站将一组移动站识别为候选发送集合，并确定候选发送集合中的移动台允许的发送功率。 识别候选发送集合中的那些移动站的子集。 分配上行链路数据传输速率并将其传送到候选发送集合中的移动站的子集，以便优化与从候选移动站的子集接收到的上行链路传输相关联的基站处理的比特的总数。 除了优化处理的总位数之外，优化可以实现一个或多个目标。

公开(公告)号：US08837621B2

公开(公告)日：2014-09-16

申请号：US13342688

申请日：2012-01-03

申请人： Jiann-Ching Guey ,  Kumar Balachandran ,  Dennis Hui

发明人： Jiann-Ching Guey ,  Kumar Balachandran ,  Dennis Hui

IPC分类号： H04B7/02 ,  H04L25/02 ,  H04L5/00 ,  H04B7/06 ,  H04L25/03

CPC分类号： H04B7/0413 ,  H04B7/0626 ,  H04B7/0691 ,  H04L5/0023 ,  H04L5/0048 ,  H04L25/0232 ,  H04L2025/03808

摘要： A transmitter, receiver, and method for channel estimation for a Multiple-Input Multiple-Output (MIMO) communication system in which the transmitter includes a multiplicity of transmit antennas spaced such that spacing between adjacent antennas provides a spatial correlation coefficient greater than a threshold level. The transmitter selects a subset of the multiplicity of transmit antennas for transmitting the pilot reference signals. The pilot reference signals are transmitted only from the selected subset of transmit antennas to the receiver. The receiver includes a channel estimator configured to derive a channel estimation for all of the multiplicity of transmit antennas using the received pilot reference signals and known or estimated spatial correlation among the multiplicity of transmit antennas.

摘要翻译： 一种用于多输入多输出（MIMO）通信系统的信道估计的发射机，接收机和方法，其中所述发射机包括多个发射天线，所述多个发射天线间隔开，使得相邻天线之间的间隔提供大于阈值水平的空间相关系数 。 发射机选择用于发射导频参考信号的多个发射天线的子集。 导频参考信号仅从选定的发射天线子集发射到接收机。 接收机包括信道估计器，其被配置为使用所接收的导频参考信号和多个发射天线之间的已知或估计的空间相关性来导出所有多个发射天线的信道估计。

公开(公告)号：US20120288022A1

公开(公告)日：2012-11-15

申请号：US13342688

申请日：2012-01-03

申请人： Jiann-Ching Guey ,  Kumar Balachandran ,  Dennis Hui

发明人： Jiann-Ching Guey ,  Kumar Balachandran ,  Dennis Hui

IPC分类号： H04B15/00 ,  H04L27/28

CPC分类号： H04B7/0413 ,  H04B7/0626 ,  H04B7/0691 ,  H04L5/0023 ,  H04L5/0048 ,  H04L25/0232 ,  H04L2025/03808

摘要： A transmitter, receiver, and method for channel estimation for a Multiple-Input Multiple-Output (MIMO) communication system in which the transmitter includes a multiplicity of transmit antennas spaced such that spacing between adjacent antennas provides a spatial correlation coefficient greater than a threshold level. The transmitter selects a subset of the multiplicity of transmit antennas for transmitting the pilot reference signals. The pilot reference signals are transmitted only from the selected subset of transmit antennas to the receiver. The receiver includes a channel estimator configured to derive a channel estimation for all of the multiplicity of transmit antennas using the received pilot reference signals and known or estimated spatial correlation among the multiplicity of transmit antennas.

摘要翻译： 一种用于多输入多输出（MIMO）通信系统的信道估计的发射机，接收机和方法，其中所述发射机包括多个发射天线，所述多个发射天线间隔开，使得相邻天线之间的间隔提供大于阈值水平的空间相关系数 。 发射机选择用于发射导频参考信号的多个发射天线的子集。 导频参考信号仅从选定的发射天线子集发射到接收机。 接收机包括信道估计器，其被配置为使用所接收的导频参考信号和多个发射天线之间的已知或估计的空间相关性来导出所有多个发射天线的信道估计。

公开(公告)号：US07274935B2

公开(公告)日：2007-09-25

申请号：US11176652

申请日：2005-07-07

申请人： Kumar Balachandran ,  Rajaram Ramesh

发明人： Kumar Balachandran ,  Rajaram Ramesh

IPC分类号： H04Q7/20

CPC分类号： H04W36/0033

摘要： A method and base station controller (BSC) in a GPRS/EDGE cellular radio telecommunication system for controlling a handover of a mobile station (MS) conducting both a circuit-switched call and a packet data session, and for rapidly reestablishing the packet data session. The BSC determines from measurement reports that a handover of the MS is imminent. The BSC sends both packet system information and Dual Transfer Mode (DTM) information relevant in the target cell to the MS prior to a handover command. When the handover is complete, the BSC may also send a pseudo cell update message to a serving SGSN. The message includes an identifier of the MS and appears to the SGSN to be from the MS. After the circuit-switched call is reconnected, the packet data session is rapidly reestablished utilizing the information sent to the mobile station prior to the handover command, and without having to send a cell update message from the MS.

摘要翻译： GPRS / EDGE蜂窝无线电通信系统中的方法和基站控制器（BSC），用于控制进行电路交换呼叫和分组数据会话的移动台（MS）的切换，并且用于快速重新建立分组数据会话 。 BSC从测量报告中确定MS的切换即将来临。 在切换命令之前，BSC将目标小区中相关的分组系统信息和双传输模式（DTM）信息发送到MS。 当切换完成时，BSC还可以向服务SGSN发送伪小区更新消息。 消息包括MS的标识符，并且向SGSN显示来自MS。 在重新连接电路交换呼叫之后，利用在切换命令之前发送到移动台的信息，并且不必从MS发送小区更新消息，迅速重新建立分组数据会话。

公开(公告)号：US20070167159A1

公开(公告)日：2007-07-19

申请号：US11380478

申请日：2006-04-27

申请人： Rajaram Ramesh ,  Kambiz Zangi ,  Kumar Balachandran

发明人： Rajaram Ramesh ,  Kambiz Zangi ,  Kumar Balachandran

IPC分类号： H04Q7/20

CPC分类号： H04W68/10 ,  H04B7/022

摘要： A broadcast-centric cellular communication system improves broadcast channel performance by exploiting the benefits of macro-diversity in a cellular communication system having a plurality of base stations that transmit signals within a plurality of associated cells. The system constructs an identical paging signal at the plurality of base stations, and controls the base stations to simultaneously transmit the identical paging signal. A mobile station camps on a paging channel that is common to the plurality of base stations, and listens to paging messages being simultaneously broadcast by the plurality of base stations. The mobile station selects a base station having a suitable signal quality, and transmits to the selected base station, a response to a paging message addressed to the mobile station.

摘要翻译： 以广播为中心的蜂窝通信系统通过利用具有在多个关联小区内发送信号的多个基站的蜂窝通信系统中的宏分集的益处来改善广播信道性能。 该系统在多个基站处构造相同的寻呼信号，并且控制基站同时发送相同的寻呼信号。 移动台驻留在多个基站共用的寻呼信道上，并且收听由多个基站同时广播的寻呼消息。 移动站选择具有适当信号质量的基站，并向所选择的基站发送对寻址到移动台的寻呼消息的响应。

公开(公告)号：US20070010252A1

公开(公告)日：2007-01-11

申请号：US11176652

申请日：2005-07-07

申请人： Kumar Balachandran ,  Rajaram Ramesh

发明人： Kumar Balachandran ,  Rajaram Ramesh

IPC分类号： H04Q7/20

CPC分类号： H04W36/0033

摘要： A method and base station controller (BSC) in a GPRS/EDGE cellular radio telecommunication system for controlling a handover of a mobile station (MS) conducting both a circuit-switched call and a packet data session, and for rapidly reestablishing the packet data session. The BSC determines from measurement reports that a handover of the MS is imminent. The BSC sends both packet system information and Dual Transfer Mode (DTM) information relevant in the target cell to the MS prior to a handover command. When the handover is complete, the BSC may also send a pseudo cell update message to a serving SGSN. The message includes an identifier of the MS and appears to the SGSN to be from the MS. After the circuit-switched call is reconnected, the packet data session is rapidly reestablished utilizing the information sent to the mobile station prior to the handover command, and without having to send a cell update message from the MS.

公开(公告)号：US07142580B1

公开(公告)日：2006-11-28

申请号：US09695357

申请日：2000-10-24

申请人： Kumar Balachandran ,  Rajaram Ramesh

发明人： Kumar Balachandran ,  Rajaram Ramesh

IPC分类号： H04B1/713

CPC分类号： H04W16/12 ,  H04W16/02

摘要： A mobile terminal and a base station subsystem may communicate by assigning a primary or control frequency to the cell in which the mobile terminal is located and using that control frequency to exchange control information between the mobile terminal and the base station subsystem. The exchange of control information in the cell is constrained to the primary or control frequency. In addition, a plurality of traffic frequencies may be assigned to the cell and used to exchange traffic information between the mobile terminal and the base station subsystem using coordinated frequency hopping. Multi-path fading experienced on diverse, non-contiguous traffic frequency bands may be uncorrelated between the respective bands. Consequently, a code-word carried over a plurality of non-contiguous frequencies may be more likely to experience random, uncorrelated fading, which may improve the signal to noise ratio (SNR) of the signal and, as a result, improve network performance.

摘要翻译： 移动终端和基站子系统可以通过向移动终端所在的小区分配主要或控制频率并使用该控制频率来在移动终端和基站子系统之间交换控制信息来进行通信。 单元中控制信息的交换被限制在主要或控制频率上。 此外，可以将多个业务频率分配给小区，并用于使用协调跳频来在移动终端和基站子系统之间交换业务信息。 在不同的，不连续的业务频段上经历的多径衰落在各个频带之间可能是不相关的。 因此，携带在多个不连续频率上的码字可能更可能经历随机，不相关的衰落，这可以提高信号的信噪比（SNR），并且因此提高网络性能。

公开(公告)号：US06608828B1

公开(公告)日：2003-08-19

申请号：US09396145

申请日：1999-09-15

申请人： Kumar Balachandran

发明人： Kumar Balachandran

IPC分类号： H04J324

CPC分类号： H04L1/0061 ,  H03M13/23 ,  H04L1/0045 ,  H04L1/0083

摘要： A header that is repeatedly transmitted and received, along with data, on a radio channel is decoded by initially decoding at least one initially received header to identify values for the header fields. The header fields include invariant header fields having determinate values and changing header fields having changing values. At least one subsequently received header is decoded using the determinate values for at least one of the invariant header fields, thereby allowing increased reliability decoding of at least one of the changing header fields. The subsequent decoding can use predictive decoding using a probability value of unity for symbols associated with at least one of the invariant header fields. Headers also may be decoded by repeatedly transmitting a first header including invariant header fields and changing header fields, along with data, over a radio channel during a persistent flow communication session. Upon successful decoding of a first header, the second header is repeatedly transmitted that includes the changing header fields but excludes at least one of the invariant header fields. The second header, including the changing header fields but excluding at least one of the invariant header fields then is decoded. The present invention may be particularly advantageous for decoding the Radio Link Control/Medium Access Control (RLC/MAC) header that includes a plurality of header fields and that is repeatedly transmitted and received along with data in the General Packet Radio System (GPRS) on a Global System for Mobile communication (GSM) radio channel.

摘要翻译： 在无线电信道上重复地发送和接收数据的报头通过首先解码至少一个最初接收的报头来识别报头字段的值来解码。 标题字段包括具有确定值的不变标题字段和改变具有改变值的标题字段。 使用用于至少一个不变标题字段的确定值来解码至少一个随后接收的报头，由此允许增加至少一个变更报头字段的可靠性解码。 随后的解码可以使用与至少一个不变标题字段相关联的符号的单位概率值的预测解码。 也可以通过在持续流通信会话期间通过无线电信道重复地发送包括不变头字段和改变报头字段以及数据的头部来解码报头。 在第一标题的成功解码之后，重复发送包括改变的报头字段的第二报头，但是不包括不变报头字段中的至少一个。 然后解码包括改变头字段但不排除至少一个不变标题字段的第二标题。 本发明对于解码包括多个报头字段的无线电链路控制/媒体接入控制（RLC / MAC）报头并且与通用分组无线电系统（GPRS）中的数据一起重复发送和接收的情况可能是特别有利的 全球移动通信系统（GSM）无线电频道。

公开(公告)号：US06014548A

公开(公告)日：2000-01-11

申请号：US54839

申请日：1998-04-03

申请人： Kumar Balachandran ,  Y-P Eric Wang

发明人： Kumar Balachandran ,  Y-P Eric Wang

IPC分类号： H04B7/185 ,  H04W48/10 ,  H04W56/00 ,  H04W88/06 ,  H04B7/19

CPC分类号： H04W48/10 ,  H04B7/18532 ,  H04W88/06 ,  H04W56/00

摘要： A method and apparatus for facilitating detection of a synchronization signal generated by a satellite cellular network by a multi-mode radiotelephone. Once detected, the radiotelephone is synchronized to the synchronization signal. The radiotelephone is also operable pursuant to a terrestrial cellular communication network. Signals generated by the terrestrial cellular communication network inform the radiotelephone of the carrier upon which the synchronization signal is transmitted. Tuning of the radiotelephone to such carrier facilitates quick detection, and subsequent synchronization to, the synchronization signal.

摘要翻译： 一种便利检测由多模式无线电话由卫星蜂窝网络产生的同步信号的方法和装置。 一旦检测到，无线电话与同步信号同步。 无线电话机还可以根据地面蜂窝通信网络进行操作。 由地面蜂窝通信网络生成的信号通知发送同步信号的载波的无线电话。 将无线电话机调谐到这种载波有助于快速检测并随后同步到同步信号。

公开(公告)号：US5968198A

公开(公告)日：1999-10-19

申请号：US699101

申请日：1996-08-16

申请人： Amer A. Hassan ,  Ali S. Khayrallah ,  Yi-Pin Eric Wang ,  Kumar Balachandran ,  Rajaram Ramesh

发明人： Amer A. Hassan ,  Ali S. Khayrallah ,  Yi-Pin Eric Wang ,  Kumar Balachandran ,  Rajaram Ramesh

IPC分类号： H04L1/00 ,  H03M13/09 ,  H03M13/13 ,  H03M13/15 ,  H03M13/29 ,  H03M13/37 ,  H03M13/45 ,  H04L1/16 ,  H04L1/18 ,  H04L25/06 ,  H03M13/00

CPC分类号： H04L25/067 ,  H03M13/13 ,  H03M13/27 ,  H03M13/2906 ,  H03M13/2933 ,  H03M13/3738 ,  H03M13/456 ,  H03M13/6306 ,  H04L1/0065 ,  H04L1/0071 ,  H03M13/09 ,  H03M13/6331 ,  H04L1/1809 ,  H04L1/1816

摘要： A coding system is disclosed wherein the receive side includes a decoder capable of producing, in addition to the hard information decoded output, either or both symbol and/or bit soft information values. For a certain information bit position, a value proportional to the joint probability that a received symbol and the set of all hypothesized transmitted codewords that led to the estimated or detected hard information output is calculated. The calculated probabilities with respect to plural codewords having a zero in that certain information bit position are compared to the calculated probabilities with respect to the plural codewords having a one in that certain information bit position. The result of the comparison provides an indication of whether the hard information output in that same information bit position is more likely a one or a zero. The output soft information values are further processed in comparison to a preset threshold, with instances exceeding the threshold triggering block rejections and/or retransmissions.

摘要翻译： 公开了一种编码系统，其中接收端包括能够产生除硬信息解码输出之外的符号和/或位软信息值之一或两者的解码器。 对于某个信息位位置，计算与接收到的符号和导致估计或检测到的硬信息输出的所有假设的发送码字的集合的联合概率成比例的值。 将具有该特定信息位位置的零的多个码字的计算概率与该特定信息位位置中具有一个的多个码字的计算概率进行比较。 比较结果提供了在该相同信息位位置中的硬信息输出是否更可能是一个或零的指示。 与预设阈值相比，输出软信息值进一步处理，其中实例超过阈值触发块拒绝和/或重传。