Method and device for generating DMRS scramble sequence

Abstract

The invention relates to the field of communication, in particular to a method and device for generating a DMRS scramble sequence. The method includes the steps that a first DMRS scramble initialization parameter X and a second DMRS scramble initialization parameter Y which are needed in the process of generating the DMRS scramble sequence are determined by a base station according to current PDSCH transmission relative parameters, then the corresponding DMRS scramble sequence is generated according to the two parameters, and correspondingly the corresponding DMRS scramble sequence can be generated by a terminal in the same method. Therefore, the DMRS scramble sequence generated by multiplex UE can be switched dynamically and freely between the same sequence and different sequences according to differences of the PDSCH transmission relative parameters, consequently, orthogonality use demands of signals are met, and signal interference between UE is reduced.

Description

technical field [0001] The invention relates to the communication field, in particular to a method and device for generating a DMRS scrambling code sequence. Background technique [0002] The uplink reference signals transmitted in the downlink transmission of the LTE-A (Long Term Evolution-Advanced) system mainly include DMRS (Demodulation Reference Symbol, demodulation reference symbol) and SRS (Sounding Reference Signal, sounding reference signal), The DMRS signal is mainly used for channel estimation and synchronization of a PDSCH (Physical Downlink Shared Channel, Physical Downlink Shared Channel), so that the receiving end can successfully demodulate data. The scrambling code sequence of the DMRS signal (referred to as the DMRS scrambling code sequence) is initialized and configured according to the cell ID of the serving cell, and the DMRS scrambling code sequence in different cells generally has different initialization configuration methods. In the CoMP (Coordinate...

AI Technical Summary

Problems solved by technology

[0031] At present, when using the above scheme B, UEs in different cells cannot generate the same DMRS scrambling code sequence; when using scheme A, once two UEs are configured with the same X, the DMRS scrambling code sequences of the two UEs are always are the same, in order to obtain a certain interference randomization effect, it is necessary to configure multiple X candidate values ​​for the terminal, and dynamically indicate the specific value of X in the DCI, and the overhead will be relatively large; when using scheme C, Once different Ys are configured for two UEs, it is almost impossible for the two UEs to generate the same DMRS scrambling code sequence, and it is difficult to realize DMRS orthogonal multiplexing between users

[0032] Obviously, with the existing DMRS scrambling sequence generation scheme, two multiplexing UEs can only meet one of the two goals of "generating the same DMRS scrambling sequence" and "generating different DRMS ​​scrambling sequences", and cannot achieve both. Obviously, as the application scenario changes, this method will not be able to meet the needs of the UE, and a new DMRS scrambling sequence generation scheme needs to be designed

Images