Method for uplink data transmission, terminal device and network device

A terminal device, comprising a transceiver and a processor, wherein

• the transceiver is configured to receive subset constraint indication information of a sounding reference signal (SRS) resource sent by a network device, and determine at least one available SRS resource subset according to the subset constraint indication information;
• and
• the processor is configured to determine a length of an SRS resource indicator (SRI) according to a quantity of the at least one available SRS resource subset indicated by the subset constraint indication information, wherein each SRS resource subset in the at least one available SRS resource subset is one SRS resource combination, and the one SRS resource combination comprises at least one SRS resource;
• wherein the processor is further configured to determine a target SRI from downlink control information (DCI) according to the length of the SRI;
• the processor is further configured to determine a target SRS resource subset corresponding to the target SRI in the at least one available SRS resource subset;
• and
• the processor is further configured to determine a transmission parameter used for uplink data transmission according to the target SRS resource subset,
• wherein the processor is specifically configured to:
• determine a corresponding relationship between a value of the SRI and the at least one available SRS resource subset according to the subset constraint indication information;
• and
• determine the target SRS resource subset corresponding to the target SRI from the at least one available SRS resource subset according to the corresponding relationship between the value of the SRI and the at least one available SRS resource subset.