Shaped-beam transmission method and shaped-beam transmission device

Abstract

The invention discloses a shaped-beam transmission method which comprises the following steps: a system sets a subframe structure for performing shaped-beam transmission, wherein, the step further comprises the sub-steps of setting previous n OFDM symbols in the subframe for purpose of transmitting a control signaling and setting the number of OFDM symbols, which are not the previous n OFDM symbols and are used by user exclusive reference signals, and frequency domain spaces of the reference signals on the same data layer, wherein, n is not less than 1 and mapping positions of the reference signals on difference data layers are not overlapped with each other; and when the system judges to perform the shaped-beam transmission, the subframe structure is dispatched to map and transmit the reference signals. The invention also discloses a shaped-beam transmission device which comprises a subframe structure setting module, a shaped-beam judging module and a mapping and transmission executing module. In the invention, the subframe structure is newly set so that the transmission of the user exclusive reference signals can be supported and the shaped-beam transmission can be performed; and meanwhile, resource consumption of the system is reduced and the method and the device are easy to be realized.

Description

technical field [0001] The present invention relates to mobile communication technology, in particular to a method and device for beamforming transmission. Background technique [0002] Currently, the Third Generation Mobile Communication System Standardization Organization (3GPP) has initiated a research project on the Long Term Evolution (LTE) of the 3G radio interface technology. According to the research progress, the current LTE standard version defines a cell-specific reference signal (Cell-specified Reference Signal, CsRS) mapping scheme. [0003] All Orthogonal Frequency Division Multiplexing (OFDM) symbols in the subframe structure are used for unicast transmission and do not support broadcast transmission. At this time, in addition to data symbols and control signaling, there can be two types of The reference signal includes CsRS and user-specific reference signal (UE-specified Reference Signal, UsRS), wherein the CsRS occupies 4 antenna ports for transmission, an...

AI Technical Summary

Problems solved by technology

[0006] The existing LTE system supports beamforming transmission, but the UsRS mapping method required for beamforming does not propose a specific solution

When using the above subframe structure for beamforming transmission, CsRS and UsRS exist at the same time. At this time, due to figure 1 Ri is the mapping position of CsRS, and UsRS can only be placed at the location of the data symbol ( figure 1 In the position occupied by D in D), correspondingly, the resource positions that can be used to transmit data symbols will be reduced. Obviously, this will lead to a relatively large resource overhead for reference signal transmission in the subframe

[0007] On the other hand, when performing beamforming transmission, it is not necessary to transmit CsRS. In order to reduce resource overhead, you can first set figure 1 The position represented by Ri in the middle is used to transmit the data symbol, and then set the resource position for transmitting UsRS in resources other than the position where Ri is located. Although this can reduce resource overhead, it needs to be transmitted between the two according to whether beamforming transmission is performed. Switching between mapping methods will greatly increase the complexity of system design

[0008] It can be seen from the above that the existing technology cannot provide a method for beamforming transmission that is simple and uses less resources for reference signal mapping

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