CPC H04W 74/0833 (2013.01) [H04W 56/005 (2013.01); H04W 72/23 (2023.01); H04W 74/006 (2013.01)] | 20 Claims |
1. A method comprising:
receiving, by a wireless device, a random access response in response to transmitting a first random access preamble, the random access response comprising an uplink grant;
transmitting, via the uplink grant, a Msg3 message comprising a wireless device identifier of the wireless device;
starting a contention resolution time window based on transmitting the Msg3 message;
determining a contention resolution is unsuccessful in response to not receiving a response, comprising the wireless device identifier and corresponding to the Msg3 message, during the contention resolution time window; and
based on the determining, performing a two-step random access procedure comprising transmitting a message comprising:
a second random access preamble via a random access channel resource; and
a transport block via an uplink resource corresponding to the random access channel resource.
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