Uplink data transmission method and apparatus

A user terminal (UE), comprising:

• at least one processor;
• and
• a memory storing computer-readable instructions executable by the at least one processor to:
• generate a first random number;
• determine whether to perform a random access process according to the first random number;
• obtain a TA value from an eNB through a random access process when it is determined the random access process is to be performed;
• and monitor a TA message broadcast by another UE and obtain a TA value from the TA message when it is determined the random access process is not to be performed;
• perform uplink data transmission according to the TA value;
• generate a TA message according to the TA value;
• and
• broadcast the generated TA message.

A Non-transitory computer readable storage medium, storing machine readable instructions executable by a processor to:

• A, generate a first random number;
• B, determine whether to initiate a random access process according to the first random number, obtain a timing advance (TA) value from a base station through a random access process when it is determined the random access process is to be initiated, monitor a TA message broadcast by another user terminal UE and obtain a TA value from the TA message when it is determined a random access process is not to be initiated;
• C, perform uplink data transmission according to the TA value;
• D, perform E when it is determined the uplink data transmission is successful;
• return to A when it is determined the uplink data transmission is unsuccessful;
• and
• E, generate a TA message according to the TA value, and broadcast the generated TA message.