CPC H04W 74/008 (2013.01) [H04W 72/0453 (2013.01); H04W 72/21 (2023.01); H04W 74/0816 (2013.01); H04W 74/0841 (2013.01); H04W 76/11 (2018.02)] | 25 Claims |
1. A random access method for communication between a user equipment (UE) and a base station, executed by the base station, comprising:
the base station receiving a first message for a random access, wherein the first message includes a preamble message and a signal message;
the base station decoding the preamble message and the signal message;
the base station transmitting, upon successfully decoding the first message, a second message and a fourth message at a time for the random access to notify that the random access is successful;
when the preamble message is successfully decoded while decoding of the signal message is failed, the base station transmitting the second message configured to request a third message that comprises the signal message;
upon reception of the third message transmitted in response to the second message, the base station decoding the signal message from the third message; and
when both the preamble message and the signal message are successfully decoded, the base station transmitting the fourth message configured to indicate that the random access is successful;
the second message comprises at least one of a time adjustment information, a cell radio network temporary identity, or an uplink resource allocation; and
the fourth message comprises a contention resolution.
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