Patent ID: 11937302
Assignee: APPLE INC.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 19:
20. A method, comprising:
receiving one or more channel access indications from one or more uplink (UL) grants from a base station scheduling a plurality of physical uplink shared channel (PUSCH) transmissions on a plurality of unlicensed carriers at a first PUSCH starting position;
processing the one or more UL grants to identify the first PUSCH starting position for the plurality of PUSCH transmissions on the plurality of unlicensed carriers;
processing the one or more UL grants to identify a Type 1 channel access procedure for the plurality of PUSCH transmissions on the plurality of unlicensed carriers;
selecting a first carrier of the plurality of unlicensed carriers;
initiating the Type 1 channel access procedure on the first carrier in response to selection of the first carrier;
determining that the Type 1 channel access procedure is successful;
initiating a first PUSCH transmission of the plurality of PUSCH transmissions on the first carrier of the plurality of unlicensed carriers in response to the determination that the Type 1 channel access procedure is successful;
initiating a Type 2 channel access procedure on one or more second carriers of the plurality of unlicensed carriers, wherein the one or more second carriers do not include the first carrier, and wherein the Type 2 channel access procedure are performed immediately before the first PUSCH transmission on the first carrier;
determining whether the Type 2 channel access procedure is successful; and
based on the determination whether the Type 2 channel access procedure is successful:
if both the Type 1 channel access procedure and the Type 2 channel access procedure are successful, initiating a second PUSCH transmission of the plurality of PUSCH transmissions on the one or more second carriers; or
if the Type 2 channel access procedure is not successful, delaying transmission on at least a third carrier of the one or more second carriers.