US Patent No. 11,032,851

QCL IN RACH DIFFERENT FROM THAT IN OTHER SIGNALS


Patent No. 11,032,851
Issue Date June 08, 2021
Title Qcl In Rach Different From That In Other Signals
Inventorship Chiou-Wei Tsai, Hsinchu (TW)
Chia-Hao Yu, Hsinchu (TW)
Assignee MEDIATEK INC., Hsin-Chu (TW)

Claim of US Patent No. 11,032,851

6. A method of wireless communication of a user equipment (UE), comprising:receiving one or more configurations from a base station via signaling in a connected state;
determining, based on the one or more configurations, (a) resources of a first physical downlink control channel (PDCCH) indicating a first physical downlink shared channel (PDSCH) that contains a random access message or indicating an uplink grant for transmitting a random access message and (b) resources of a second PDCCH;
determining, in a time domain, (a) that the first PDCCH overlaps with the second PDCCH, (b) that the first PDCCH overlaps with a second PDSCH that contains system data or user data and indicated by the second PDCCH, (c) that the first PDSCH overlaps with the second PDCCH, or (d) that the first PDSCH overlaps with the second PDSCH;
determining that a first down-link reference signal for monitoring the first PDCCH and a second down-link reference signal for monitoring the second PDCCH are not quasi-colocated;
determining that a random access event has occurred in the connected state;
selecting a down-link reference signal transmitted from the base station and that is not quasi-colocated with a serving beam of from the base station to the UE;
transmitting a preamble sequence to the base station using random access sources indicating the selected down-link reference signal; and
receiving, from the base station, the random access message on the first PDSCH on a beam that is different from the serving beam when the resources of a first PDCCH indicating a first PDSCH.