Method for transmitting data, user equipment, and network side device

Abstract

The embodiment of the invention relates to a method for transmitting data, user equipment, and a network side device. The method comprises: first data and a first demodulation reference signal that are sent by a first network side device through n antenna ports as well as second data and a second demodulation reference signal that are sent by a second network side device through m antenna ports are received in a sub frame, wherein time-frequency resources occupied by the first demodulation reference signal are different from the time-frequency resources occupied by the second demodulation reference signal and at least parts of the time-frequency resources occupied by the first data and the second data are overlapped; and the data are demodulated based on the first demodulation reference signal and the second demodulation reference signal. The data transmission method, the user equipment, and the network side device can be applied to multi-point cooperative transmission of simultaneous data sending to user equipment by a plurality of network side devices in a non-quasi-co-address state, thereby guaranteeing orthogonality of demodulation reference signals of the plurality of network side devices.

Description

technical field [0001] The present invention relates to the communication field, in particular to a data transmission method, user equipment and network side equipment. Background technique [0002] In the Long Term Evolution (LTE) network, Release 10 (Rel-10) introduces transmission mode (transmission mode, TM) 9, which supports 8 antenna ports for data transmission and demodulation reference signal (Demodulation Reference Signal, DM-RS). According to the time-frequency resources occupied by the DM-RS transmitted by each antenna port, the eight antenna ports can be divided into two groups, and the four antenna ports in each group occupy the same time-frequency resources to transmit DM-RS through code division , the group of antenna ports may be called a DM-RS code division multiplexing (Code Division Multiplexing, CDM) group. [0003] LTE supports multiple-input multiple-output (Multiple-Input Multiple-Output, MIMO) transmission, supports simultaneous transmission of up t...

AI Technical Summary

Problems solved by technology

However, for antenna ports at different locations, the quasi-co-location requirement is not met. For example, for network-side device 1 and network-side device 2 at different locations, the set of antenna ports corresponding to the demodulation reference signal of network-side device 1 is A1, and the network-side device 1 The antenna port set corresponding to the demodulation reference signal of device 2 is A2. The antennas in A1 and A2 do not meet the quasi-co-location requirements, which will lead to the destruction of the orthogonality of DM-RS, thereby affecting the accuracy of channel estimation and solution tuned performance, different antenna ports in A1 and A2 cannot send data to the same user at the same time

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