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    • 25. 发明申请
    • ADAPTIVE CHANNEL STATE FEEDBACK ESTIMATION
    • 自适应通道状态反馈估计
    • WO2014074914A1
    • 2014-05-15
    • PCT/US2013/069291
    • 2013-11-08
    • APPLE INC.
    • JI, ZhuDAMJI, NavidSEBENI, Johnson
    • H04L1/00H04L25/02
    • H04L1/0023H04B7/065H04L1/0026H04L25/0204H04L25/0222H04L25/0224H04W24/10
    • Aspects of the present invention provide apparatuses and methods for adaptive channel state feedback (CSF) estimation techniques. Downlink transmissions can be received at a mobile device. The downlink transmissions can be received after the mobile device has entered a power saving mode of operation. The downlink transmission received can be a discontinuous downlink subframe and can include one or more pilot symbols. A channel variation factor of the transmission channel can be determined based on the received downlink transmission. Based on the amount of variation of the transmission channel, either an earlier-received or a later-received pilot symbol can be used for CSF estimation. Further, either higher or lower weighted filter coefficients can be selected for use in CSF estimation based on the amount of variation of the transmission channel.
    • 本发明的方面提供了用于自适应信道状态反馈(CSF)估计技术的装置和方法。 可以在移动设备处接收下行传输。 在移动设备进入省电操作模式之后,可以接收下行链路传输。 接收到的下行链路传输可以是不连续的下行链路子帧,并且可以包括一个或多个导频符号。 可以基于接收到的下行链路传输来确定传输信道的信道变化因子。 基于传输信道的变化量,先前接收的或稍后接收的导频符号可用于CSF估计。 此外,基于传输信道的变化量,可以选择较高或较低加权滤波器系数用于CSF估计。
    • 26. 发明申请
    • OUTER LOOP LINK ADAPTATION FOR DEVICE RESUMPTION
    • 用于设备恢复的外部环路适配
    • WO2013173066A1
    • 2013-11-21
    • PCT/US2013/039054
    • 2013-05-01
    • APPLE INC.
    • TABET, TarikFLYNN, Paul V.MUJTABA, Syed A.DAMJI, NavidJI, ZhuVALLATH, Sreevalsan
    • H04L1/00
    • H04L1/0003Y02D50/10
    • Outer loop link adaptation for device resumption. A user equipment (UE) and base station (BS) may be in communication in a first network (e.g., an LTE network). Communication between the UE and the BS may be interrupted, e.g., due to a long fading environment, the UE tuning away to a second network (e.g., a CDMA network). Accordingly, the measured error rate may increase dramatically. After resumption from the interruption, a negative offset may be applied to a reported SINR value from the UE due to the previous increase in error rate. Upon improvement in the error rate, a larger, positive offset adjustment may be added to the negative offset, allowing the estimated SINR to return to reported SINR more quickly. Additionally, the error rate estimation may be adjusted to converge to a more recently measured more quickly by decreasing a feedback filter coefficient.
    • 用于设备恢复的外环链路自适应。 用户设备(UE)和基站(BS)可以在第一网络(例如,LTE网络)中进行通信。 UE和BS之间的通信可能被中断,例如由于漫长的衰落环境,UE调谐到第二网络(例如,CDMA网络)。 因此,测量的误码率可能会急剧增加。 在从中断恢复之后,由于错误率的先前增加,可能对来自UE的所报告的SINR值应用负偏移。 在改进误差率时,可以将更大的正偏移调整添加到负偏移,从而允许估计的SINR更快地返回到所报告的SINR。 此外,可以通过减小反馈滤波器系数来调整误差率估计以收敛到更近的测量更快。