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    • 63. 发明授权
    • Bundling of ACK information in a wireless communication system
    • 在无线通信系统中捆绑ACK信息
    • US08634333B2
    • 2014-01-21
    • US12435717
    • 2009-05-05
    • Sandip Sarkar
    • Sandip Sarkar
    • H04B7/005
    • H04L1/1621H04L1/16H04L1/18
    • Techniques for bundling acknowledgement (ACK) information in a wireless communication system are described. In one design, a user equipment (UE) may receive multiple codewords in at least one downlink subframe. The UE may decode the multiple codewords and determine an ACK or a negative acknowledgement (NACK) for each codeword based on decoding result. The UE may bundle the ACKs and NACKs for the multiple codewords to obtain bundled ACK information. In one design, the UE may generate (i) a bundled ACK if ACKs are obtained for all codewords or (ii) a bundled NACK if a NACK is obtained for any codeword. The UE may send the bundled ACK information as feedback for the multiple codewords. The UE may receive retransmissions of the multiple codewords if a bundled NACK is sent and may receive new codewords if a bundled ACK is sent.
    • 描述用于在无线通信系统中捆绑确认(ACK)信息的技术。 在一种设计中,用户设备(UE)可以在至少一个下行链路子帧中接收多个码字。 UE可以解码多个码字,并且基于解码结果确定每个码字的ACK或否定确认(NACK)。 UE可以捆绑多个码字的ACK和NACK以获得捆绑的ACK信息。 在一种设计中,如果针对所有码字获得ACK,则UE可以生成(i)捆绑ACK,或者如果为任何码字获得NACK,则(ii)绑定的NACK。 UE可以发送捆绑的ACK信息作为多个码字的反馈。 如果发送了捆绑的NACK,则UE可以接收多个码字的重传,并且如果发送了捆绑的ACK,则可以接收新的码字。
    • 67. 发明授权
    • Eigen-beamforming for wireless communication systems
    • 无线通信系统的特征波束成形
    • US08014265B2
    • 2011-09-06
    • US12189483
    • 2008-08-11
    • Sandip SarkarByoung-Hoon KimDurga Prasad MalladiJuan Montojo
    • Sandip SarkarByoung-Hoon KimDurga Prasad MalladiJuan Montojo
    • H04W4/00
    • H04B7/0417H04B7/0434H04B7/063H04B7/0632H04L5/14H04L25/0204H04L25/0228H04L25/0242H04L25/03343H04L2025/03426H04L2025/03802
    • Techniques for sending multiple-input multiple-output (MIMO) transmissions in wireless communication systems are described. In one design, a transmitter sends a first reference signal via a first link, e.g., a cell-specific reference signal via the downlink. The transmitter receives channel quality indicator (CQI) information determined by a receiver based on the first reference signal. The transmitter also receives a second reference signal from the receiver via a second link, e.g., a sounding reference signal via the uplink. The transmitter obtains at least one MIMO channel matrix for the first link based on the second reference signal. The transmitter determines at least one precoding matrix based on the at least one MIMO channel matrix, e.g., in accordance with ideal eigen-beamforming or pseudo eigen-beamforming. The transmitter then sends a data transmission to the receiver based on the at least one precoding matrix and the CQI information.
    • 描述了在无线通信系统中发送多输入多输出(MIMO)传输的技术。 在一种设计中,发射机经由第一链路发送第一参考信号,例如经由下行链路的小区特定参考信号。 发射机基于第一参考信号接收由接收机确定的信道质量指示符(CQI)信息。 发射机还经由第二链路从接收机接收第二参考信号,例如经由上行链路的探测参考信号。 发射机基于第二参考信号获得用于第一链路的至少一个MIMO信道矩阵。 发射机基于至少一个MIMO信道矩阵来确定至少一个预编码矩阵,例如,根据理想的本征波束形成或伪特征波束形成。 然后,发射机基于至少一个预编码矩阵和CQI信息向接收机发送数据传输。
    • 69. 发明申请
    • RANDOM ACCESS CHANNEL (RACH) OPTIMIZATION FOR A SELF-ORGANIZING NETWORK (SON)
    • 自组织网络的随机访问通道(RACH)优化(SON)
    • US20100232318A1
    • 2010-09-16
    • US12720565
    • 2010-03-09
    • Sandip Sarkar
    • Sandip Sarkar
    • H04L12/28H04L12/26
    • H04W28/18H04W24/02H04W52/50H04W74/0833
    • Systems and methodologies are described that facilitate optimizing parameters for random access in a wireless communication environment. A network manager can select centrally optimized parameters for random access that mitigate interference among RACH attempts and/or mitigate uplink interference due to RACH in a SON. Moreover, a base station can select locally optimized parameters for random access that mitigate a number of access attempts, mitigate interference among RACH attempts, and/or mitigate uplink interference due to RACH. The centrally optimized parameters can include PRACH configurations, root sequence parameters, ranges for one or more MAC parameters (e.g., initial transmit power, power ramp step, maximum number of preamble transmissions, contention resolution timer, . . . ), and so forth. Further, the locally optimized parameters can include sequence length, one or more MAC parameters (e.g., initial received target power of the random access preamble, power ramp step, contention resolution timer, maximum number of preamble transmissions, . . . ), etc.
    • 描述了有助于在无线通信环境中优化用于随机接入的参数的系统和方法。 网络管理器可以选择用于随机接入的集中优化参数,以减轻RACH尝试之间的干扰和/或减轻由于SON中的RACH引起的上行链路干扰。 此外,基站可以选择用于随机接入的本地优化参数,其减轻接入尝试次数,减轻RACH尝试之间的干扰,和/或减轻由于RACH引起的上行链路干扰。 集中优化的参数可以包括PRACH配置,根序列参数,一个或多个MAC参数的范围(例如,初始发射功率,功率斜坡步长,前导码传输的最大数量,争用解决定时器等)等等。 此外,本地优化的参数可以包括序列长度,一个或多个MAC参数(例如,随机接入前导码的初始接收目标功率,功率斜坡步长,争用解决定时器,前导码传输的最大数目等)等。