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    EXPLOITING CHANNEL TIME CORRELATION TO REDUCE CHANNEL STATE INFORMATION FEEDBACK BITRATE
    1.
    发明授权
    EXPLOITING CHANNEL TIME CORRELATION TO REDUCE CHANNEL STATE INFORMATION FEEDBACK BITRATE 有权
    利用信道时间相关来减少信道状态信息反馈比特率

    公开(公告)号：EP2569885B1

    公开(公告)日：2017-09-20

    申请号：EP11724035.8

    申请日：2011-04-21

    申请人： Telefonaktiebolaget LM Ericsson (publ)

    发明人： CHENG, Jung-Fu ,  HUI, Dennis ,  ZANGI, Kambiz ,  KRASNY, Leonid

    IPC分类号： H04L1/00 ,  H04B7/06 ,  H04L1/20 ,  H04B7/04 ,  H04B17/00

    CPC分类号： H04W72/0413 ,  H04L1/0019 ,  H04L1/0028 ,  H04L1/20 ,  H04W72/042

    摘要： The required bitrate for reporting channel state information from a network transceiver to the network is dramatically reduced, while maintaining fidelity of channel estimates, by exploiting prior channel estimates and the time correlation of channel response. For a selected set of sub-carriers, the transceiver estimates channel frequency response from pilot signals. The transceiver also predicts the frequency response for each selected sub-carrier, by multiplying a state vector comprising prior frequency response estimate and a coefficient vector comprising linear predictive coefficients. The predicted frequency response is subtracted from the estimated frequency response, and the prediction error is quantized and transmitted to the network. The network maintains a corresponding state vector and predictive coefficient vector, and also predicts a frequency response for each selected sub-carrier. The received prediction error is inverse quantized and subtracted from the predicted frequency response to yield a frequency response corresponding to that estimated at the transceiver.

    摘要翻译： 通过利用先前的信道估计和信道响应的时间相关性，用于从网络收发机向网络报告信道状态信息所需的比特率被显着降低，同时保持信道估计的保真度。 对于选定的一组子载波，收发器估计来自导频信号的信道频率响应。 收发器还通过将包括先前的频率响应估计的状态向量与包括线性预测系数的系数向量相乘来预测每个选择的子载波的频率响应。 从估计的频率响应中减去预测的频率响应，并且预测误差被量化并传送到网络。 网络维持相应的状态向量和预测系数向量，并且还预测每个选择的子载波的频率响应。 将接收到的预测误差进行逆量化并从预测的频率响应中减去以产生与在收发器处估计的频率响应对应的频率响应。

    NETWORK-CENTRIC LINK ADAPTATION FOR COORDINATED MULTIPOINT DOWNLINK TRANSMISSION
    2.
    发明公开
    NETWORK-CENTRIC LINK ADAPTATION FOR COORDINATED MULTIPOINT DOWNLINK TRANSMISSION 审中-公开
    网络中心的链路自适应协作多点向下转移

    公开(公告)号：EP2859672A1

    公开(公告)日：2015-04-15

    申请号：EP13742749.8

    申请日：2013-06-06

    申请人： Telefonaktiebolaget LM Ericsson (Publ)

    发明人： ZANGI, Kambiz ,  HUI, Dennis ,  HAFEEZ, Abdulrauf

    IPC分类号： H04J11/00

    CPC分类号： H04J11/0053

    摘要： A Coordinated Multipoint (CoMP) cell controller performs network-centric link adaptation for User Equipment (UE) in the CoMP cell. The CoMP cell controller receives at least infrequent channel estimates from a UE in the CoMP cell, from which it estimates downlink channel and thermal noise at the UE. The CoMP cell controller is aware of the desired signal to be received at the UE, and the intra-CoMP cell interference to the UE caused by transmissions to other UEs in the CoMP cell. The CoMP cell receives from the UE reports of inter-CoMP cell interference caused by transmissions by other CoMP cells. Based on the downlink channel quality, the desired signal, the intra-CoMP cell interference, the inter-CoMP cell interference, and the thermal noise, the CoMP cell controller performs link adaptation by selecting modulation and coding schemes, and other transmission parameters, for an upcoming transmission duration (such as a TTI).

    SOFT BIT VALUE GENERATION IN A SEQUENCE ESTIMATOR
    3.
    发明公开
    SOFT BIT VALUE GENERATION IN A SEQUENCE ESTIMATOR 有权
    GENERATING软比特值在序列预测

    公开(公告)号：EP2460329A2

    公开(公告)日：2012-06-06

    申请号：EP10752928.1

    申请日：2010-07-27

    申请人： Telefonaktiebolaget LM Ericsson (publ)

    发明人： ZANGI, Kambiz ,  RAMESH, Rajaram

    IPC分类号： H04L25/03

    CPC分类号： H04L25/03318 ,  H04L25/03229 ,  H04L2025/03388

    摘要： Teachings presented herein offer reduced computational complexity for symbol sequence estimation, and also provide for the generation of soft bit values representing the reliability of that estimation. A demodulator is configured to generate these soft bit v allies by identifying a candidate value for each symbol in the sequence which is more likely than at least one other in a defined set of candidate values. Based on the candidate value identified for each symbol, the demodulator forms a reduced set of candidate values for the symbol by selecting as many additional candidate values from the defined set as are needed to have complementary bit values lot each bit value in that identified candidate value The demodulator calculates soft hit values for the symbol sequence based on a sequence estimation process w hose state space for each symbol is constrained to the cot responding reduced set.

    DISTRIBUTED COMPUTATION OF PRECODING WEIGHTS FOR COORDINATED MULTIPOINT TRANSMISSION ON THE DOWNLINK
    4.
    发明公开
    DISTRIBUTED COMPUTATION OF PRECODING WEIGHTS FOR COORDINATED MULTIPOINT TRANSMISSION ON THE DOWNLINK 有权
    协调一致的下行链路多点的传输VORKODIERUNGSGEWICHTEN的分布式计算

    公开(公告)号：EP2430772A1

    公开(公告)日：2012-03-21

    申请号：EP10726584.5

    申请日：2010-05-14

    申请人： Telefonaktiebolaget LM Ericsson (publ)

    发明人： HUI, Dennis ,  ZANGI, Kambiz

    IPC分类号： H04B7/02

    CPC分类号： H04B7/024 ,  H04B7/0615 ,  H04W52/365

    摘要： In a Coordinated Multi-point (CoMP) system, the base station (BS) in each serving cell ( or sector) is allowed to use not only its own antennas, but also the antennas of neighboring BSs to transmit to mobile terminals in the serving cell to form a floating CoMP cell The serving BS in each floating CoMP cell computes tentative linear preceding weights for transmissions from the coordinating BSs in the floating CoMP cell to users in the serving cell of the floating CoMP cell. The serving RS determines the power availability for transmit antennas in the floating CoMP cell that are shared with other floating CoMP cells, and scales the tentative preceding weights based on the power availability of the shared transmit antennas to determine final preceding weights so that the power constraints of the shared transmit antennas will not be violated.

    BROAD-CAST CENTRIC CELLULAR COMMUNICATION SYSTEM, METHOD, AND MOBILE STATION
    5.
    发明公开
    BROAD-CAST CENTRIC CELLULAR COMMUNICATION SYSTEM, METHOD, AND MOBILE STATION 审中-公开
    广播中心的蜂窝通信系统的方法和移动站

    公开(公告)号：EP1974569A1

    公开(公告)日：2008-10-01

    申请号：EP06824583.6

    申请日：2006-11-28

    申请人： Telefonaktiebolaget LM Ericsson (publ)

    发明人： RAMESH, Rajaram ,  ZANGI, Kambiz ,  BALACHANDRAN, Kumar

    IPC分类号： H04Q7/38 ,  H04L27/26 ,  H04Q7/32

    CPC分类号： H04B7/022 ,  H04W48/12

    摘要： The present invention relates to a broadcast-centric cellular communication system that 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. System-specific control information common to all cells is synchronously and simultaneously broadcast from multiple base stations using a broadcast channel that is identical across the entire system. Cell-specific control information is transmitted individually from each base station. Mobile stations use the broadcast information for initial synchronization to the system, and to obtain most relevant system information. After system synchronization, the mobile stations identify the connected cell through a physical layer characteristic, and perform initial access to the system. The invention furthermore relates to a mobile station for operating in such communication system and a method in said mobile station.