DATA TRANSMISSION METHOD, TERMINAL DEVICE AND NETWORK DEVICE
FIG2 is a schematic diagram of a time-frequency resource that is used to transmit data of an eMBB service and that is preempted by data of a URLLC service
To improve the system resource utilization, an access network device generally does not reserve a resource for downlink data transmission of the URLLC service due to the burstiness of data of the URLLC service. When the data of the URLLC service arrives at the access network device, if there is no idle time-frequency resource currently, to meet the ultra-short latency requirement of the URLLC service, the access network device cannot wait for scheduling the data of the URLLC service after completing data transmission of the eMBB service scheduled currently. The access network device can allocate a resource to the data of the URLLC service in a preemption manner. FIG2 is a schematic diagram of a time-frequency resource that is used to transmit data of an eMBB service and that is preempted by data of an URLLC service. The preemption herein means that the access network device selects some or all of allocated time-frequency resources that are used to transmit data of the eMBB service, to transmit the data of the URLLC service, and the access network device does not send the data of the eMBB service on the time-frequency resource used to transmit the data of the URLLC service.
schematic diagram
122
terminal device terminal devices
116
terminal device terminal devices
100
communications system
126
reverse link
2
CBG
104
antennas
112
antennas
118
forward links forward link
102
network device
106
antennas
124
forward link forward links
120
reverse link
['1. A data transmission method, comprising: receiving, by a terminal device, first control information sent by a network device, wherein the first control information is used to instruct the terminal device to receive, on a first time-frequency resource, a first transport block sent by the network device at an n th  time; receiving, by the terminal device, the first transport block on the first time-frequency resource; and receiving, by the terminal device, first indication information sent by the network device, wherein the first indication information is used to indicate a first code block group CBG in the first transport block, and the first CBG corresponds to a second time-frequency resource during n th  transmission of the first transport block, wherein n is an integer greater than or equal to']