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    • 7. 发明申请
    • BEAMFORMING WITH PHASE COMPENSATION
    • 具有相位补偿的波束形成
    • WO2013003974A1
    • 2013-01-10
    • PCT/CN2011/001088
    • 2011-07-01
    • TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)SONG, XinghuaXIAO, LeiZHU, Huaisong
    • SONG, XinghuaXIAO, LeiZHU, Huaisong
    • H04B7/01
    • H04B7/01H04B7/0604H04B7/0617H04B7/0626H04B7/0639H04B7/0689H04B7/086H04B7/2643H04B17/10H04B17/11H04L5/14
    • The invention discloses a method and a base station for phase compensation in beamforming in a multi-antenna Time Division Duplex (TDD) communication network. In a first transmission mode, e.g. TM4 or TM8, the base station estimates a first phase shift between a first antenna port and a reference antenna port in uplink based on a measurement of a first Sounding Reference Signal (SRS). Then the base station estimates in the first transmission mode a second phase shift between the first antenna port and the reference antenna port in downlink based on a Channel State Information (CSI) feedback from a User Equipment (UE), and calculates a parameter indicative of a difference between the first phase shift and the second phase shift. In a second transmission mode, e.g. TM7 or TM8, the base station estimates a third phase shift between the first antenna port and the reference antenna port in uplink based on a measurement of a second SRS, and calculates in the second transmission mode, a fourth phase shift between the first antenna port and the reference antenna port in downlink as a difference between the third phase shift and the parameter. The base station then compensates in the second transmission mode, the phase of input signal on the first antenna port by the fourth phase shift for beamforming.
    • 本发明公开了一种在多天线时分双工(TDD)通信网络中的波束成形中的相位补偿的方法和基站。 在第一传输模式中,例如, TM4或TM8,基站基于第一探测参考信号(SRS)的测量来估计上行链路中的第一天线端口和参考天线端口之间的第一相移。 然后,基站基于来自用户设备(UE)的信道状态信息(CSI)反馈,在第一传输模式中估计第一天线端口和下行链路中的参考天线端口之间的第二相移,并且计算表示 第一相移和第二相移之间的差。 在第二传输模式中,例如, TM7或TM8,基站基于第二SRS的测量来估计上行链路中的第一天线端口和参考天线端口之间的第三相移,并且在第二传输模式中计算第一天线端口与第二天线端口之间的第四相移 和下行链路中的参考天线端口作为第三相移与参数之间的差。 然后,基站在第二传输模式下补偿第一天线端口上的输入信号的相位,用于波束形成的第四相移。
    • 10. 发明申请
    • TECHNIQUE FOR PERFORMING A RANDOM ACCESS PROCEDURE IN A MOBILE DEVICE
    • 在移动设备中执行随机访问过程的技术
    • WO2009098189A1
    • 2009-08-13
    • PCT/EP2009/051168
    • 2009-02-03
    • TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)LIPKA, Dietmar
    • LIPKA, Dietmar
    • H04B7/01
    • H04B7/01H04W56/0035
    • A technique for performing a random access procedure in a fast moving mobile device (100) in context with accessing a radio base station (101 ) is described. A method embodiment of the technique comprises tuning a receiver (106) of the mobile device (100) to an expected frequency of a pilot signal (136) provided by the base station (101 ); determining, based on an output signal of the receiver (140), a feedback signal (142) for locking the receiver (106) to a receive frequency of the pilot signal (136); providing the feedback signal (148) to a transmitter (108) of the mobile device (100); and adjusting a transmission frequency of a random access signal (154) according to a frequency offset between the expected frequency and the receive frequency of the pilot signal (136) indicated by the feedback signal (148).
    • 描述了一种用于在接入无线电基站(101)的上下文中在快速移动的移动设备(100)中执行随机接入过程的技术。 该技术的方法实施例包括将移动设备(100)的接收机(106)调谐到由基站(101)提供的导频信号(136)的期望频率; 基于所述接收器(140)的输出信号,确定用于将所述接收器(106)锁定到所述导频信号(136)的接收频率的反馈信号(142)。 将所述反馈信号(148)提供给所述移动设备(100)的发射机(108); 以及根据由反馈信号(148)指示的导频信号(136)的预期频率和接收频率之间的频率偏移来调整随机接入信号(154)的发射频率。