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    • 1. 发明申请
    • Short Random Access Channel (RACH) Disabling in TDD-LTE
    • TDD-LTE中的短随机接入信道(RACH)禁止
    • US20130201885A1
    • 2013-08-08
    • US13364652
    • 2012-02-02
    • Ming YangTom ChinQingxin ChenGuangming Shi
    • Ming YangTom ChinQingxin ChenGuangming Shi
    • H04J3/00
    • H04W72/082H04W74/08
    • In TDD-LTE wireless systems, an additional fourth preamble for the random access channel, called short RACH, may be used. If short RACH signaling is to be used, the random access preamble is transmitted in the uplink pilot time slot (UpPTS) field in the special subframe. The location of the uplink pilot time slot (UpPTS) is next to a downlink subframe. Therefore, interference from neighbor base stations may interfere with the short RACH preamble within the uplink pilot time slot. The interference to the short RACH will prevent the eNodeB from detecting the short RACH preamble and thus prevent the UE from accessing the network. An interference level on an Uplink Pilot Time Slot (UpPTS) may be measured and when the interference level exceeds a threshold value a User Equipment (UE) is instructed to disable short Random Access Channel (RACH) signaling. The UE may then be instructed to enable normal RACH. When the interference level falls below the threshold value the UE is instructed to resume short RACH signaling
    • 在TDD-LTE无线系统中,可以使用称为短RACH的随机接入信道的另外的第四前同步码。 如果要使用短的RACH信令,则在特殊子帧中的上行链路导频时隙(UpPTS)字段中发送随机接入前导码。 上行链路导频时隙(UpPTS)的位置在下行子帧的旁边。 因此,来自相邻基站的干扰可能干扰上行链路导频时隙内的短RACH前导码。 对短RACH的干扰将阻止eNodeB检测短RACH前同步码,从而防止UE接入网络。 可以测量上行链路导频时隙(UpPTS)上的干扰电平,并且当干扰电平超过阈值时,指示用户设备(UE)禁用短随机接入信道(RACH)信令。 然后可以指示UE启用正常的RACH。 当干扰电平低于阈值时,UE被指示恢复短的RACH信令
    • 6. 发明申请
    • CALL RECOVERY IN TD-SCDMA HANDOVER FAILURE
    • TD-SCDMA切换失败中的呼叫恢复
    • US20130176866A1
    • 2013-07-11
    • US13344441
    • 2012-01-05
    • Ming YangTom ChinQingxin ChenGuangming Shi
    • Ming YangTom ChinQingxin ChenGuangming Shi
    • H04W24/00H04W36/00
    • H04W56/0045H04W36/0079H04W36/08H04W56/0005
    • A method of wireless communication includes measuring and recording a path loss of a first downlink signal from a source base station, prior to attempting handoff from the source base station to a target base station. The path loss of a second downlink signal from the source base station is measured after unsuccessful handoff from the source base station to the target base station. A UE communicates with the source base station, after unsuccessful handoff, using an uplink timing corresponding to an uplink timing recorded prior to attempting handoff when a difference between the path loss of the first downlink signal and the path loss of the second downlink signal fails to meet a threshold value. A new uplink timing is used when the difference meets the threshold value.
    • 一种无线通信方法包括在尝试从源基站到目标基站的切换之前测量并记录来自源基站的第一下行链路信号的路径损耗。 在从源基站到目标基站的切换不成功之后,测量来自源基站的第二下行链路信号的路径损耗。 在第一下行链路信号的路径损耗与第二下行链路信号的路径损耗之间的差异不成立时,UE在切换不成功之后,使用对应于在尝试切换之前记录的上行链路定时的上行链路定时,与源基站通信, 满足阈值。 当差值满足阈值时,使用新的上行链路定时。
    • 8. 发明授权
    • Short random access channel (RACH) disabling in TDD-LTE
    • 在TDD-LTE中的短随机接入信道(RACH)禁用
    • US08873435B2
    • 2014-10-28
    • US13364652
    • 2012-02-02
    • Ming YangTom ChinQingxin ChenGuangming Shi
    • Ming YangTom ChinQingxin ChenGuangming Shi
    • H04J3/00
    • H04W72/082H04W74/08
    • In TDD-LTE wireless systems, an additional fourth preamble for the random access channel, called short RACH, may be used. If short RACH signaling is to be used, the random access preamble is transmitted in the uplink pilot time slot (UpPTS) field in the special subframe. The location of the uplink pilot time slot (UpPTS) is next to a downlink subframe. Therefore, interference from neighbor base stations may interfere with the short RACH preamble within the uplink pilot time slot. The interference to the short RACH will prevent the eNodeB from detecting the short RACH preamble and thus prevent the UE from accessing the network. An interference level on an Uplink Pilot Time Slot (UpPTS) may be measured and when the interference level exceeds a threshold value a User Equipment (UE) is instructed to disable short Random Access Channel (RACH) signaling. The UE may then be instructed to enable normal RACH. When the interference level falls below the threshold value the UE is instructed to resume short RACH signaling.
    • 在TDD-LTE无线系统中,可以使用称为短RACH的随机接入信道的另外的第四前同步码。 如果要使用短的RACH信令,则在特殊子帧中的上行链路导频时隙(UpPTS)字段中发送随机接入前导码。 上行链路导频时隙(UpPTS)的位置在下行子帧的旁边。 因此,来自相邻基站的干扰可能干扰上行链路导频时隙内的短RACH前导码。 对短RACH的干扰将阻止eNodeB检测短RACH前同步码,从而防止UE接入网络。 可以测量上行链路导频时隙(UpPTS)上的干扰电平,并且当干扰电平超过阈值时,指示用户设备(UE)禁用短随机接入信道(RACH)信令。 然后可以指示UE启用正常的RACH。 当干扰电平低于阈值时,UE被指示恢复短的RACH信令。