Method for transmitting and receiving random access request and transmitting and receiving random access response

A method for performing a random access procedure by a base station, the method comprising:

• receiving a random access preamble from a user equipment (UE);
• determining an end time in which transmitting the random access preamble was terminated by the UE;
• generating a random access response in response to the random access preamble;
• and
• transmitting the random access response to the UE within the time period,
• wherein the time period starts at a time point after the end time in which transmitting the random access preamble was terminated by the UE, and a subframe number corresponding to the time point is obtained by adding an offset to a subframe number corresponding to the end time, and the offset equals three.

A user equipment (UE) to perform a random access procedure, the UE comprising:

• a transmitter to transmit a random access preamble to a base station;
• a processor configured to determine a time period for receiving a random access response responsive to the random access preamble;
• and
• a receiver to receive the random access response from the base station within the time period,
• wherein the time period starts at a time point after an end time of transmitting the random access preamble, and a subframe number corresponding to the time point is obtained by adding an offset to a subframe number corresponding to the end time of transmitting the random access preamble, and the offset equals three.

A base station to perform a random access procedure, the base station comprising:

• a receiver to receive a random access preamble from a user equipment (UE);
• a processor configured to determine an end time in which transmitting the random access preamble was terminated by the UE, and to generate a random access response in response to the random access preamble;
• and
• a transmitter to transmit the random access response to the UE within a time period
• wherein the time period starts at a time point after the end time in which transmitting the random access preamble was terminated by the UE, and a subframe number corresponding to the time point is obtained by adding an offset to a subframe lumber corresponding to the end time, and the offset equals three.