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METHOD FOR A JOINT TIME-FREQUENCY SYNCHRONIZATION OF USER EQUIPMENT IN NB-IOT NETWORKS
METHOD FOR A JOINT TIME-FREQUENCY SYNCHRONIZATION OF USER EQUIPMENT IN NB-IOT NETWORKS
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机译:NB-IOT网络中用户设备的关节时间频率同步的方法
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摘要
The invention discloses a method for a joint time-frequency synchronization of User Equipment in NB-IoT Networks already connected to a serving cell obtaining an optimal time- frequency offset estimation. The objective to provide a procedure that permits optimized time-frequency synchronization of a UE, whereby quantities already known to the UE are used to operate the UE power efficiently and with a better performance will be solved by a method comprising the following stages: - demodulating a received NB-IoT subframe Rm with regard to a pre-computed reference NB-IoT subframe Bm derived from information of the serving cell, and storing Wm in matrix W; - computing a metric Vm(f,t) and recursively combining it with Wm, resulting in a new metric Um(f,t); - recursively computing a reference value Sm over Wm; - comparing the metric Um(f,t) with the Sm, whereas - if a normalized value of Um(f,t)/Sm does not exceed a threshold Kthres(m), stages 1 to 5 of the method are recursively repeated up to a maximum number Mmaxhave been demodulated, otherwise - if the normalized value of Um(f,t)/Sm exceeds the threshold Kthres(m), arg-max values with regard to the discrete frequency offset values f ϵF and the discrete time offset values t ϵF are computed based on the values of Um(f,t) obtaining an optimal value of the time-frequency offset estimate.
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机译:本发明公开了一种用于已经连接到服务小区的NB-IOT网络中用户设备的关节时频同步的方法,获得最佳时频偏移估计。该目的提供一种过程,该过程允许UE的优化时频同步,由此,UE已知的数量用于有效地操作UE功率,并且通过包括以下阶段的方法可以解决更好的性能: - 解调关于预先计算的参考NB-IOT子帧 B B B m b m 从服务小区的信息派生,并在矩阵中存储 w m m 我> w ; - 计算度量标准 Vm(f,t),并递归地将其与 w m ,导致新的度量标准 m (f,t); - 递归计算参考值 s m 上面的 w m ; - 将度量 u m (f,t) 与 s 进行比较 m ,而是 - 如果 U m 的归一化值 (f,t) / s m 不超过阈值k thres (m),该方法的阶段1至5递归地重复到最大数 m max 已被解调,否则 - 如果 u m (f,t)的归一化值 / s m 超过阈值k thres (m),关于离散频率偏移值fεf和离散时间偏移值tεf的arg-max值是基于 u m (f,t)获得时间频率偏移估计的最佳值。
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