# US 2019/0174542 A1 · Subband based uplink access for nr-ss > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0174542 A1 - Document ID: US20190174542A1 - Status: Published application - Kind: A1 - Application number: 16/204,800 - Filed: 2018-11-29 - Published: 2019-06-06 - Earliest claimed: 2017-12-01 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Jing Lei; Jing Sun; Tamer Kadous - Web page: https://patentgrep.com/patent/US20190174542A1 ## CPC - H04W 74/0816: with collision avoidance - H04L 5/001: {the frequencies being arranged in component carriers} - H04L 5/0042: {Intra-user or intra-terminal allocation} - H04L 5/0044: {Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 5/006: {Quality of the received signal, e.g. BER, SNR, water filling} - H04L 27/0006: {Assessment of spectral gaps suitable for allocating digitally modulated signals, e.g. for carrier allocation in cognitive radio (for spectrum sharing between different networks H04W16/14)} - H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA - H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network - H04W 74/006: {in the downlink, i.e. towards the terminal} - H04W 74/0808: using carrier sensing, e.g. carrier sense multiple access [CSMA] - H04W 16/14: Spectrum sharing arrangements {between different networks} - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Subband based uplink access for new radio (NR) shared spectrum (NR-SS) is disclosed. A base station performs a listen before talk (LBT) procedure on system allocated subbands of a shared communication channel. The base station determines a first set of candidate subbands that are signaled to a user equipment (UE). The UE performs an LBT procedure on the first set to identify a second set of candidate subbands including the successful LBT subbands of the first set. Aspects of the disclosure provide for managing and refining the subbands for transmissions. A first aspect provides the UE to determine a transmission behavior based on mismatch between the first and second sets. A second aspect provides the first and second sets in handshaking between the base station and UE for refining the eventual transmission set of subbands. A third aspect provides cross-band LBT reporting for further refining subband selection in later slots. ## Claims ### Claim 1 A method of wireless communication, comprising: receiving, by a user equipment (UE), an uplink grant and an identification of a first set of candidate subbands from a serving base station, wherein the identification includes a clear channel assessment (CCA) trigger for the UE; performing, by the UE, a CCA on 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; and preparing, by the UE, uplink transmissions in response to the second set of candidate subbands being a subset of the first set of candidate subbands. ### Claim 2 (depends on 1) The method of claim 1, wherein the preparing the uplink transmissions include: dropping the uplink transmission scheduled for the uplink grant. ### Claim 3 (depends on 1) The method of claim 1, wherein the preparing the uplink transmissions include: puncturing the uplink transmissions scheduled for each subband of the first set of candidate subbands not included in the second set of candidate subbands; and transmitting remaining data of the uplink transmissions using the second set of subbands. ### Claim 4 (depends on 1) The method of claim 1, wherein the preparing the uplink transmissions include: rate matching a reduced portion of the uplink transmissions according to a rate matching scheme to fit within the second set of candidate subbands; transmitting the reduced portion of the uplink transmissions using the second set of candidate subbands; and signaling to the serving base station notification of the rate matching scheme. ### Claim 5 (depends on 1) The method of claim 1, wherein the preparing the uplink transmissions include: adjusting a transport block size to fit all of the uplink transmissions into the second set of candidate subbands; and transmitting the uplink transmissions using the second set of candidate subbands. ### Claim 6 (depends on 1) The method of claim 1, further including: identifying, by the UE, one or more system allocated subbands outside of the first set of candidate subbands; and deactivating, by the UE, the identified one or more system allocated subbands. ### Claim 7 (depends on 6) The method of claim 6, further including: receiving, at the UE, a subband wake-up signal from the serving base station; and reactivating, by the base station, the one or more system allocated subbands in response to the subband wake-up signal. ### Claim 9 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. ### Claim 10 (depends on 9) The method of claim 9, wherein the uplink pre-grant is included in one of: a UE specific unicast transmission from the serving base station; or a common downlink control channel. ### Claim 11 (depends on 9) The method of claim 9, further including: measuring, by the UE, channel quality for each subband of the third set of candidate subbands, wherein the channel quality is determined based on signals received with the uplink grant; and identifying, by the UE, the one or more of the third set of candidate subbands for the fourth set of candidate subbands based on the channel quality. ### Claim 12 (depends on 9) The method of claim 9, further including: performing, by the UE, a listen before talk (LBT) procedure on each subband of the third set of candidate subbands prior to the transmitting the uplink transmissions; and identifying, by the UE, the one or more of the third set of candidate subbands based on a result of the LBT procedure. ### Claim 13 (depends on 9) The method of claim 9, further including: identifying, by the UE, one or more system allocated subbands outside the first set of candidate subbands; and deactivating, by the UE, the identified one or more system allocated subbands. ### Claim 14 (depends on 13) The method of claim 13, further including: receiving, at the UE, a subband wake-up signal from the serving base station; and reactivating, by the base station, the one or more system allocated subbands in response to the subband wake-up signal. ### Claim 16 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. ### Claim 17 (depends on 16) The method of claim 16, wherein the uplink pre-grant is included in one of: a UE-specific unicast transmission to the at least one UE; or a common downlink control channel. ### Claim 18 (depends on 16) The method of claim 16, further including: measuring, by the base station, channel quality for each subband of the second set of candidate subbands, wherein the channel quality is determined based on signals received with the CCA success indicator; and identifying, by the base station, the one or more of the second set of candidate subbands for the third set of candidate subbands based on the channel quality. ### Claim 20 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. ### Claim 21 (depends on 20) The method of claim 20, wherein the transmitting further includes transmitting an updated channel state information with the CCA outcome report. ### Claim 22 (depends on 20) The method of claim 20, further including: receiving, by the UE, a refined uplink scheduling for a next slot from the serving base station, wherein the refined uplink scheduling includes identification 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 additional uplink transmissions to the serving base station using the third set of candidate subbands. ### Claim 23 (depends on 20) The method of claim 20, wherein the CCA outcome includes one of: the CCA outcome for each subband of the first set of candidate subbands; or the CCA outcome for each subband of the second set of candidate subbands. ### Claim 24 (depends on 20) The method of claim 20, further including: identifying, by the UE, one or more system allocated subbands outside of the first set of candidate subbands; and deactivating, by the UE, the identified one or more system allocated subbands. ### Claim 25 (depends on 24) The method of claim 24, further including: receiving, at the UE, a subband wake-up signal from the serving base station; and reactivating, by the base station, the one or more system allocated subbands in response to the subband wake-up signal.