A method for measuring downlink channel characteristic parameters and user equipment

Abstract

The present application proposes a method for measuring downlink channel characteristic parameters using virtual co-located multiple reference signal resources, including the following steps: the user equipment receives signaling, and obtains the corresponding virtual co-location relationship corresponding to the measured downlink channel characteristic parameters Combination of multiple reference signal resources and corresponding configuration information; user equipment performs measurement of downlink channel characteristic parameters on the multiple reference signal resources satisfying the virtual co-location relationship, and reports corresponding downlink channel characteristic parameters according to the measurement configuration. The present application also proposes a user equipment. The present application satisfies the virtual co-location relationship by rationally configuring multiple reference signal resources, enabling the UE to effectively improve the UE's measurement accuracy of downlink channel characteristic parameters on the premise of maintaining reasonable complexity and power consumption.

Description

technical field [0001] The present application relates to the technical field of wireless communication, and in particular, the present application relates to a method for measuring downlink channel characteristic parameters and user equipment. Background technique [0002] For the LTE Rel8 / 9 / 10 system, the cell common reference signal, CSI-RS, user-specific reference signal resource and downlink data channel are all sent from the same transmission point, that is, these signals are co-located. Due to co-location, these signals have the same channel characteristics, and the user equipment (UE) usually estimates channel characteristics based on the cell common reference signal (CRS), such as Doppler spread, delay spread, frequency synchronization and time synchronization. In addition, the CRS is also used to support the measurement of radio resource management measurement quantities, for example, to support the measurement of reference signal received power, reference symbol r...

AI Technical Summary

Problems solved by technology

like figure 1 As shown, a CRS has 8 resource samples in a time-frequency resource block, while a CSI-RS has only 2 resource elements in a time-frequency resource block (in the case of 2 antenna ports), and the number of samples is very small. less, resulting in poor accuracy of the measured channel characteristic parameters. For some channel characteristic parameters, the range of estimation and measurement is very small, which cannot meet the needs of the system.

[0007] In the current standardization, it is proposed to use the user-specific reference signal (DMRS) of PDSCH to assist in estimating channel characteristic parameters, but the number of sample points of the user-specific reference signal is limited by the number of resource blocks occupied by the user-specific reference signal currently deployed in the downlink

When the number of downlink user resources is small, the estimation accuracy is poor, and the channel characteristics cannot be effectively tracked

At the same time, since the user-specific reference signal is sent together with the downlink data, it comes from different transmission points in different subframes, so the user equipment cannot predict the channel characteristic parameters in advance, and needs to be estimated in each downlink data subframe, which increases the implementation the complexity of

[0008] Therefore, it is necessary to propose an effective technical solution to solve the technical problems of insufficient accuracy of channel characteristic measurement based on a single channel reference resource in the virtual co-location set, and the range of estimation of certain channel characteristic parameters is very small , technical problems that cannot meet the needs of the system

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