Random access scheme for user equipment

摘要

A method of efficiently processing a random access response message, when a terminal (or user equipment) performs random access, is disclosed. After the terminal transmits a random access preamble to a base station, the terminal may receive a random access response message having a format of medium access control protocol data unit (MAC PDU) including only a backoff indicator subheader in a MAC header of the MAC PDU, from the base station in response to the random access preamble. As described above, the terminal, which has received the random access response message including only a backoff indicator subheader in the MAC header of the MAC PDU, may consider a random access response reception procedure not successful and may perform a subsequent procedure for a random access responses reception failure.

主权项

1. A method of a terminal in a communication system, the method comprising:
transmitting a random access preamble via a physical random access channel (PRACH) by the terminal to a network; monitoring by the terminal a random access response identified by a first type identifier associated with the PRACH after transmitting the random access preamble during a specific time window; decoding by the terminal the random access response comprising a backoff indicator subheader, if the random access response is identified by the first type identifier; setting by the terminal a backoff parameter value in the terminal as indicated by a backoff indicator field of the backoff indicator subheader; performing by the terminal a first procedure for a successful random access response reception, if the random access response further comprises a second type identifier identifying the random access preamble; and performing by the terminal a second procedure for a unsuccessful random access response reception, if no random access response containing the second type identifier is received within the specific time window.