公开(公告)号：US20150049672A1

公开(公告)日：2015-02-19

申请号：US14459071

申请日：2014-08-13

Applicant: QUALCOMM INCORPORATED

Inventor： Xiliang LUO ,  Brian Clarke BANISTER ,  Shivratna Giri SRINIVASAN ,  Keith William SAINTS ,  Amir AMINZADEH GOHARI ,  Wenshu ZHANG ,  Timothy Paul PALS ,  Ke LIU ,  Alexei Yurievitch GOROKHOV ,  Amir FARAJIDANA

IPC: H04W40/16 ,  H04W40/30

CPC classification number: H04W40/16 ,  H04W36/0088 ,  H04W36/04 ,  H04W36/36 ,  H04W40/30

Abstract: Certain aspects relate to methods and apparatus for avoiding and/or escaping cell range expansion (CRE) in a heterogeneous network (HetNet). A user equipment (UE) may detect the occurrence of one or more conditions while the UE is in a region of cell range expansion (CRE) in which the UE may be handed over from a first cell of a first power class type to a second cell of a second power class type, the second power class type being lower than the first power class type. The UE may take action to stop being served by the second cell or avoid being handed over to the second cell in response to the detection.

Abstract translation: 某些方面涉及用于避免和/或逃避异构网络（HetNet）中的小区范围扩展（CRE）的方法和装置。 用户设备（UE）可以在UE处于其中UE可以从第一功率类型的第一小区切换到小区范围扩展（CRE）的区域中时，检测出一个或多个条件的发生， 第二功率类型的小区，第二功率类型低于第一功率类型。 UE可以采取动作来停止由第二小区服务，或者避免响应于该检测被切换到第二小区。

公开(公告)号：US20150071387A1

公开(公告)日：2015-03-12

申请号：US14191243

申请日：2014-02-26

Applicant: QUALCOMM Incorporated

Inventor： Xiliang LUO ,  Wenshu ZHANG ,  Keith William SAINTS ,  Ke LIU ,  Kapil BHATTAD ,  Alexei Yurievitch GOROKHOV

IPC: H04L1/00

CPC classification number: H04L1/0054 ,  H04L5/0023 ,  H04L5/005 ,  H04L25/0212 ,  H04L25/067 ,  H04L27/2656 ,  H04L27/2675

Abstract: Certain aspects of the present disclosure relate to methods and apparatus for blind detection of cell-specific reference signals. Methods and apparatus are provided for detecting a cell-specific reference signal (CRS) in an orthogonal frequency division multiplexed (OFDM) symbol by a user equipment (UE). The method generally includes predicting a current channel response of a current OFDM symbol based on a channel response of at least one previous OFDM symbol, estimating a noise power level of the current OFDM symbol, forming a log likelihood ratio (LLR) of two detection hypotheses based on the predicted current channel response and the estimated noise power level, comparing the LLR to a pre-determined threshold, and determining that at least one CRS is present in the current OFDM symbol based on the comparison.

Abstract translation: 本公开的某些方面涉及盲细胞特异性参考信号的盲检测方法和装置。 提供了用于由用户设备（UE）检测正交频分复用（OFDM）符号中的小区特定参考信号（CRS）的方法和装置。 该方法通常包括基于至少一个先前OFDM符号的信道响应来预测当前OFDM符号的当前信道响应，估计当前OFDM符号的噪声功率电平，形成两个检测假设的对数似然比（LLR） 基于预测的当前信道响应和估计的噪声功率电平，将LLR与预定阈值进行比较，并且基于该比较确定当前OFDM符号中存在至少一个CRS。