Random access channel resource selection in multi-beam environment

A user equipment (UE) comprising:

• one or more non-transitory computer-readable media having computer-executable instructions embodied thereon;
• at least one processor coupled to the one or more non-transitory computer-readable media, and configured to execute the computer-executable instructions to:
• determine whether a first Synchronization Signal-Reference Signal Received Power (SS-RSRP) of a first Synchronization Signal Block (SSB) associated with a contention-free random access resource for transmitting a random access preamble is greater than an SS-RSRP threshold;
• transmit the random access preamble, by using the contention-free random access resource associated with the first SSB, after determining that the first SS-RSRP of the first SSB is greater than the SS-RSRP threshold;
• and
• perform a plurality of operations after determining that the first SS-RSRP of the first SSB is not greater than the SS-RSRP threshold, the plurality of operations including:
• determining whether a second SS-RSRP of a second SSB associated with a contention-based random access resource is greater than the SS-RSRP threshold;
• determining whether the contention-based random access resource associated with the second SSB is received through dedicated Radio Resource Control (RRC) signaling;
• and
• transmitting the random access preamble using the contention-based random access resource based upon whether the contention-based random access resource is received through the dedicated RRC signaling, after determining that the second SS-RSRP of the second SSB is greater than the SS-RSRP threshold,
• wherein:
• in a case that the contention-based random access resource is not received through the dedicated RRC signaling, the contention-based random access resource is indicated in a common random access configuration stored in the UE, and the contention-based random access resource indicated in the common random access configuration is broadcast by a source base station.