METHOD AND USER EQUIPMENT FOR PERFORMING RANDOM ACCESS PROCEDURE
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United States of America Patent
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Apr 2, 2020
app pub date -
May 24, 2018
filing date -
May 26, 2017
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Abstract
A user equipment (UE) of the present invention performs a random access preamble (Msg1) transmission of a random access procedure, receives a random access response (Msg2) of the random access procedure, and performs an Msg3 transmission of the random access procedure. The UE starts a contention resolution timer, which specifies a duration during which the UE is to monitor a physical downlink control channel (PDCCH) after the Msg3 transmission, when performing the Msg3 transmission of the random access procedure. The UE starts a backoff at a time when the UE detects that the Msg3 transmission of the random access procedure is not successful, even before the contention resolution timer expires, if the Msg3 transmission of the random access procedure is a last Msg3 transmission of the random access procedure.
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