Data transmission method and apparatus technical field

A data transmission apparatus, applied to a network based on an unslotted carrier sense multiple access with collision avoidance (CSMA/CA) mechanism, wherein the network comprises a plurality of nodes, the plurality of nodes share a channel, the data transmission apparatus is a sending node in the plurality of nodes, and the apparatus comprises a memory and a processor, wherein:

• the memory is configured to store instructions, and the processor is configured to execute the instruction stored in the memory to implement a data transmission method comprising:
• determining, through a first clear channel assessment, that the channel is idle;
• waiting for a delay duration, and performing a second clear channel assessment on the channel after the delay duration, wherein the delay duration is an interframe spacing (IFS;
• and
• sending a data frame to a receiving node in the plurality of nodes through the channel in response to determining, through the second clear channel assessment, that the channel is idle, wherein TLIFS represents a preset long interframe spacing LIFS, TSIFS represents a preset short interframe spacing (SIFS), Tturnaround represents a preset duration of switching between receiving and sending statuses of a transceiver, Tcca represents a duration required by a clear channel assessment, β represents a dynamic adjustment coefficient, and max( ) represents a MAX function.