Uplink data transmission method and apparatus

An uplink data transmission apparatus, comprising:

• a sending module, configured to send a second message comprising indication information, wherein the indication information is used to enable a terminal device to determine, according to the indication information, a contention transmission unit (CTU) for uplink data transmission, the uplink data transmission is transmitting uplink data by using at least two CTUs that are in a same transmission time interval (TTI), the CTU refers to a transmission resource combining a time, a frequency, and a code domain, or a transmission resource combining a time, a frequency, and a pilot, or a transmission resource combining a time, a frequency, a code domain, and a pilot, and the uplink data transmitted by using the at least two CTUs is partially same or totally same.

An uplink data transmission apparatus, comprising:

• a receiving module, configured to receive a second message comprising indication information, wherein the indication information is used to enable the apparatus to determine, according to the indication information, a contention transmission unit (CTU) for uplink data transmission, the uplink data transmission is transmitting uplink data by using at least two CTUs that are in a same transmission time interval (TTI), the CTU refers to a transmission resource combining a time, a frequency, and a code domain, or a transmission resource combining a time, a frequency, and a pilot, or a transmission resource combining a time, a frequency, a code domain, and a pilot, and the uplink data transmitted by using the at least two CTUs is partially same or totally same.