Transmission direction configuration method, device, and system

A terminal device, comprising at least one processor, and a memory, wherein the memory stores an execution instruction;

• and the at least one processor executes the execution instruction to enable the terminal device to perform the following steps:
• receiving first indication information from a network device, wherein the first indication information is used to indicate a configuration of uplink and/or downlink transmission directions, the configuration is used to describe types, a number, and distribution of resource elements comprised in one period, the resource element is a resource that is obtained through division based on a resource granularity, the resource granularity comprises a time domain granularity, the time domain granularity comprises orthogonal frequency division multiplexing (OFDM) symbol, the types of the resource elements comprise at least one of an uplink resource element, a downlink resource element, or a switch resource element between the downlink resource element and the uplink resource element, a transmission direction of the uplink resource element is an uplink direction, and a transmission direction of the downlink resource element is a downlink direction;
• and
• performing information transmission or a configuration operation based on the configuration, indicated by the first indication information, of the uplink and/or downlink transmission directions.