Data transmission method, terminal and network side device

A terminal, comprising:

• a transceiver, a memory, a processor and a program stored in the memory and executable on the processor, wherein
• the transceiver is configured to receive a first message, wherein the first message comprises first transmission configuration indicator (TCI) state indication information;
• the transceiver or the processor is configured to determine, K TCI states of K transmission layers indicated by the first TCI state indication information, according to a first correspondence relationship combination included in pre-acquired TCI configuration information, wherein the TCI configuration information at least comprises a correspondence relationship combination configured to indicate correspondence relationships between TCI states of a plurality of transmission layers and the first TCI state indication information, the first correspondence relationship combination is configured to indicate the correspondence relationship between the TCI states of the K transmission layers and the first TCI state indication information, K is a quantity of layers used for data transmission;
• and
• the transceiver is further configured to perform data transmissions in the K transmission layers according to the K TCI states respectively.