Data transmission method and apparatus and communication system
A data transmission method, apparatus and system including terminal equipment for channel detection and terminating the channel detection at a first time position, a result of the channel detection being that a channel is idle; and the terminal equipment transmits data starting from a second time position, the second time position being after the first time position, a first time length between the first time position and the second time position being less than or equal to a second time length. The terminal equipment terminates the channel detection after determining that the channel is idle, and transmits data after a time length (a first time length). As the first time length is less than or equal to a time length (the second time length) of an OFF-ON transient period to which the data correspond, a time length between terminating the channel detection and transmitting the data is reduced.
1. A data transmission apparatus, configured in a terminal equipment, the apparatus comprising:
a receiver configured to receive first indication information transmitted by a network device, the first indication information indicating beginning of a transmission;
processor circuitry configured to perform channel detection before the transmission; and
a transmitter configured to transmit the transmission when result of the channel detection is idle, wherein an OFF-ON transient period for the transmission starts before the beginning of the transmission and extends into the transmission.
2. The apparatus according to claim 1 , wherein in a time domain, the OFF-ON transient period is overlapped with a last sensing slot of the channel detection and the transmission.
3. The apparatus according to claim 1 , wherein the transmission includes cyclic prefix.
4. The apparatus according to claim 1 , wherein the receiver is further configured to receive second indication information transmitted by the network device, the second indication information indicating a channel access type for the transmission.
5. The apparatus according to claim 4 , wherein the processor circuitry is further configured to perform channel detection corresponding to the transmission or not to perform channel detection before transmitting the transmission according to the channel access type.
6. The apparatus according to claim 4 , wherein the processor circuitry is further configured to determine a channel access type to which the transmission corresponds, the channel access type determined by the processor circuitry being different from the channel access type indicated by the second indication information.
7. The apparatus according to claim 6 , wherein the processor circuitry is further configured to determine the channel access type to which the transmission corresponds according to a first condition, the first condition being related to whether a first reference transmission of the transmission is transmitted.
8. The apparatus according to claim 1 , wherein the beginning of the transmission is within the OFF-ON transient period to which the transmission corresponds.
9. A data transmission apparatus, configured in a network device, the apparatus comprising:
a transmitter configured to transmit first indication information to a terminal equipment;
wherein the first indication information indicates beginning of a transmission transmitted by the terminal equipment, wherein the transmission is transmitted when result of channel detection which is performed before the transmission is idle, and an OFF-ON transient period for the transmission starts before the beginning of the transmission and extends into the transmission.
10. The apparatus according to claim 9 , wherein the transmitter is further configured to transmit second indication information to the terminal equipment; and the second indication information indicates a channel access type for the transmission.
11. The apparatus according to claim 10 , wherein the channel access type at least comprises: directly transmitting without performing channel detection, and transmitting after performing channel detection of a first fixed time length;
when a second condition is satisfied, the network device indicates the terminal equipment via the second indication information to transmit the transmission directly without performing channel detection;
and when a third condition is satisfied, the network device indicates the terminal equipment via the second indication information to transmit the transmission after performing channel detection of the first fixed time length;
wherein the second condition is different from the third condition.
12. The apparatus according to claim 11 , wherein the second condition and the third condition are respectively related to at least one of the following:
a time interval between the transmission and a second reference transmission, in time domain, the second reference transmission being before the transmission;
time-domain resource lengths to which the transmission corresponds.
13. The apparatus according to claim 12 , wherein an ending position of the time interval is beginning of the transmission.
14. The apparatus according to claim 12 , wherein the second reference transmission is a latest transmission before the transmission in the COT where the transmission is present.