Data transmission method and device thereof

A data transmission method, comprising:

• sending, by a read/write device, first signaling to an answer device, the first signaling carrying target flag information, the target flag information is used to determine the answer device;
• receiving, by the read/write device, first access information sent by the answer device if a first flag information of the answer device matches the target flag information;
• storing, by the read/write device, a first slot of the answer device if the read/write device detects that an access failure occurred in the answer device, the first slot indicating a quantity of slots corresponding to the access failure of the answer device, and the access failure indicating the answer device failed to receive a response message sent by the read/write device for the first access information sent by the answer device;
• and
• sending, by the read/write device, a third trigger message, the third trigger message carrying a target slot comprising the first slot, the third trigger message indicating the answer device corresponding to the target slot to perform re-access, the third trigger message comprising a variable P, wherein P=Q+n, P=Q−n, or P=Q*n, n is a positive integer greater than or equal to 1, and Q is used by the answer device to determine the first slot.

An answer device, comprising:

• a memory storing instructions;
• and
• at least one processor in communication with the memory, the at least one processor configured, upon execution of the instructions, to perform the following steps:
• receive first signaling sent by a read/write device, the first signaling carrying target flag information;
• determine that the target flag information matches a first flag information;
• determine a first slot based on the target flag information matching the first flag information;
• send first access information to the read/write device in the first slot;
• store the first slot if the answer device failed to receive an acknowledgment message sent by the read/write device, the first slot indicating a quantity of slots corresponding to an access failure of the answer device, the access failure indicating that the answer device failed to receive a response message sent by the read/write device for the first access information sent by the answer device;
• and
• receive a third trigger message sent by the read/write device, the third trigger message carrying a target slot comprising the first slot, the third trigger message indicating the answer device corresponding to the target slot to perform re-access, the third trigger message comprising a variable P, P=Q+n, P=Q−n, or P=Q*n, n is a positive integer greater than or equal to 1, and Q is used by the answer device to determine the first slot.

A read/write device, comprising:

• a memory storing instructions;
• and
• at least one processor in communication with the memory, the at least one processor configured, upon execution of the instructions, to perform the following steps:
• send first signaling to an answer device, the first signaling carrying target flag information, the target flag information is used to determine the answer device;
• receive first access information sent by the answer device if a first flag information of the answer device matches the target flag information;
• store a first slot of the answer device if the read/write device detects that an access failure occurred in the answer device, the first slot indicating a quantity of slots corresponding to the access failure of the answer device, and the access failure indicating the answer device failed to receive a response message sent by the read/write device for the first access information sent by the answer device;
• and
• send a third trigger message, the third trigger message carrying a target slot comprising the first slot, the third trigger message indicating the answer device corresponding to the target slot to perform re-access, the third trigger message comprising a variable P, wherein P=Q+n, P=Q−n, or P=Q*n, n is a positive integer greater than or equal to 1, and Q is used by the answer device to determine the first slot.