Subband based uplink access for nr-ss

A method of wireless communications, comprising:

• receiving, by a user equipment (UE), an uplink pre-grant signal from a serving base station, wherein the uplink pre-grant signal is received on each subband of a first set of candidate subbands;
• performing, by the UE, a clear channel assessment (CCA) on each subband of the first set of candidate subbands;
• transmitting, by the UE, a CCA success indicator to the serving base station, wherein the CCA success indicator is transmitted on each subband of a second set of candidate subbands, the second set of candidate subbands including one or more subbands of the first set of candidate subbands for which the CCA was successful;
• receiving, by the UE, an uplink grant from the serving base station, wherein the uplink grant is received on each subband of a third set of candidate subbands, the third set of candidate subbands including one or more of the second set of candidate subbands;
• and
• transmitting, by the UE, uplink transmissions to the serving base station using a fourth set of candidate subbands, wherein the fourth set of candidate subbands includes one or more of the third set of candidate subbands.

A method of wireless communication, comprising:

• performing, by a base station, a clear channel assessment (CCA) on each subband of a set of system allocated subbands;
• transmitting, by the base station, an uplink pre-grant signal to the at least one user equipment (UE), wherein the uplink pre-grant signal is transmitted on each subband of a first set of candidate subbands, the first set of candidate subbands including a plurality of subbands of the set of system allocated subbands for which the CCA is successful;
• receiving, by the base station, a CCA success indicator from the at least one UE, wherein the CCA success indicator is transmitted on each subband of a second set of candidate subbands, the second set of candidate subband.s including one or more subbands of the first set of candidate subbands;
• transmitting, by the base station, an uplink grant to the at least one UE, wherein the uplink grant is transmitted on each subband of a third set of candidate subbands, the third set of candidate subbands including one or more of the second set of candidate subbands;
• and
• receiving, by the base station, uplink transmissions from the at least one UE using a fourth set of candidate subbands, wherein the fourth set of candidate subbands includes one or more of the third set of candidate subbands.

A method of wireless communication, comprising;

• receiving, by a user equipment (UE), an uplink grant from a serving base station, wherein the uplink grant is received on each subband of a first set of candidate subbands;
• performing, by the UE, a clear channel assessment (CCA) on the each subband of the first set of candidate subbands;
• determining, by the UE, a second set of candidate subbands including one or more subbands of the first set of candidate subbands for which the CCA is successful;
• transmitting, by the UE, permitted uplink transmissions and a CCA outcome report on each subband of the second set of candidate subbands, wherein the permitted uplink transmissions were scheduled on a subband of the first set of candidate subbands corresponding to the each subband of the second set of candidate subbands and the CCA outcome report includes a CCA outcome for the CCA on the first set of candidate subbands;
• and
• withdrawing, by the UE, non-permitted uplink transmissions scheduled for one or more subband of the first set of candidate subbands outside of the second set of candidate subbands.