Random access method and user equipment

A random access method, comprising:

• receiving a random access preamble sequence sent by a user equipment (UE);
• determining how many antennas the UE has based on the random access preamble sequence;
• determining a transmit diversity scheme according to the number of antenna of the UE;
• and
• receiving the at least one of the layer 2 message and the layer 3 message sent by the UE through multiple antennas according to the transmit diversity.

A user equipment (UE), comprising:

• a processor, a memory, a communication interface and a bus;
• wherein the processor, the memory and the communication interface are connected and communicate with each other through the bus;
• and
• wherein the processor is configured to:
• receive a first mapping relationship between a number of antennas and a random access preamble sequence;
• determine the random access preamble sequence according to the number of antennas of the UE and the first mapping relationship;
• send the random access preamble sequence to a base station through a first antenna, so that the base station obtains the number of antennas of the UE according to the random access preamble sequence, wherein the first antenna is any antenna of multiple antennas of the UE;
• judge whether a random access response sent by the base station is received within a preset time threshold;
• and
• send at least one of a layer 2 message and a layer 3 message to the base station by using multiple antennas according to a preset rule, if the random access response is received.