# US 12,225,395 B2 · Carrier aggregation uplink switch gap detection and report > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,225,395 B2 - Document ID: US12225395B2 - Status: Granted - Kind: B2 - Application number: 17/780,175 - Filed: 2019-11-29 - Published: 2023-01-12 - Granted: 2025-02-11 - Earliest claimed: 2019-11-29 - Assignees: QUALCOMM Incorporated - Applicants: Qualcomm Incorporated - Inventors: Yiqing Cao; Peter Gaal; Chenxi Hao; Bo Chen - Web page: https://patentgrep.com/patent/US12225395B2 ## CPC - H04L 5/0096: {Indication of changes in allocation} - H04W 24/08: Testing, {supervising or monitoring} using real traffic - H04L 5/001: {the frequencies being arranged in component carriers} - H04L 5/0078: {Timing of allocation} - H04W 72/1268: of uplink data flows - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W 74/0841: {with collision treatment} - H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)} - H04W 8/24: Transfer of terminal data - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive, from a base station, an indication of a monitoring window used by the base station to monitor for uplink transmissions from the UE. The UE may receive a control signal scheduling uplink resources for an uplink transmission by the UE on at least a first component carrier, the first component carrier in a first radio frequency spectrum band. The UE may reconfigure, in response to the received control signal, a first transmit chain of the UE from a second component carrier in a second radio frequency spectrum band to the first component carrier in the first radio frequency spectrum band for the uplink transmission. The UE may transmit, based at least in part on the indicated monitoring window and using at least the reconfigured first transmit chain, the uplink transmission on the first component carrier using the scheduled uplink resources. ## Claims ### Claim 1 A method for wireless communication at a user equipment (UE), comprising: receiving, from a network device, an indication of a duration of a monitoring window used by the network device to monitor for uplink transmissions from the UE, wherein the duration of the monitoring window is associated with a switching time of the UE; receiving a control signal scheduling uplink resources for an uplink transmission by the UE on at least a first component carrier, the first component carrier in a first radio frequency spectrum band; reconfiguring, in response to the received control signal, a first transmit chain of the UE from a second component carrier in a second radio frequency spectrum band to the first component carrier in the first radio frequency spectrum band for the uplink transmission; and transmitting, within the duration of the monitoring window and using at least the reconfigured first transmit chain, the uplink transmission on the first component carrier using the scheduled uplink resources. ### Claim 2 (depends on 1) The method of claim 1, further comprising: identifying a timing for the uplink transmission based at least in part on a timing offset indicated by the received control signal; determining, based at least in part on the identified timing, that the first transmit chain can be reconfigured before expiration of the indicated monitoring window; and reconfiguring the first transmit chain based on the determining. ### Claim 3 (depends on 1) The method of claim 1, further comprising: transmitting a UE capability message indicating a reconfiguration time for the first transmit chain, wherein the duration of the monitoring window is based at least in part on the UE capability message. ### Claim 4 (depends on 3) The method of claim 3, wherein the duration of the monitoring window is cell-specific and based at least in part on a largest switching gap reported by at least one UE to the network device. ### Claim 5 (depends on 3) The method of claim 3, wherein the duration of the monitoring window is UE-specific for the UE based at least in part the UE capability message. ### Claim 6 (depends on 1) The method of claim 1, further comprising: transmitting, in the uplink transmission, an indication that the UE has reconfigured the first transmit chain of the UE. ### Claim 7 (depends on 6) The method of claim 6, wherein the indication comprises one or more bits via a resource determined using a resource allocation mechanism which is decided by a value in a beta-offset table. ### Claim 8 (depends on 7) The method of claim 7, wherein the value in the beta-offset table comprises one or more entries of a hybrid automatic repeat request (HARQ) table, or one or more entries of a channel state information (CSI) table, or a combination thereof. ### Claim 9 (depends on 7) The method of claim 7, wherein the beta-offset table is for the indication of monitoring windows used by the network device. ### Claim 10 (depends on 1) The method of claim 1, wherein the monitoring window spans one or more slots, with a first slot of the one or more slots comprising a slot in which the uplink transmission is scheduled. ### Claim 11 (depends on 1) The method of claim 1, wherein the uplink transmission comprises an uplink data signal transmission, or an uplink control signal transmission, or a reference signal transmission, a physical random access channel (PRACH), or a combination thereof. ### Claim 12 (depends on 1) The method of claim 1, wherein the control signal comprises a radio resource control (RRC) grant, or a downlink control information (DCI) grant, or a combination thereof. ### Claim 13 (depends on 1) The method of claim 1, wherein the indication of the duration of the monitoring window is received in a radio resource control (RRC) configuration signal, or RRC reconfiguration signal, or a system information signal, or a combination thereof. ### Claim 14 A method for wireless communication at a network device, comprising: determining, based at least in part on a capability of a user equipment (UE), a duration of a monitoring window to use to monitor for uplink transmissions from the UE, wherein the duration of the monitoring window is associated with a switching time of the UE in accordance with the capability of the UE; transmitting, to the UE, an indication of the duration of the monitoring window; transmitting, to the UE, a control signal scheduling uplink resources for an uplink transmission by the UE on at least a first component carrier, the first component carrier in a first radio frequency spectrum band; and receiving, within the duration of the monitoring window, the uplink transmission on the first component carrier using the scheduled uplink resources. ### Claim 15 (depends on 14) The method of claim 14, further comprising: receiving a UE capability message indicating a reconfiguration time for a first transmit chain of the UE, wherein the duration of the monitoring window is based at least in part on the UE capability message. ### Claim 16 (depends on 15) The method of claim 15, wherein the duration of the monitoring window is cell-specific and based at least in part on a largest switching gap reported by at least one UE to the network device. ### Claim 17 (depends on 15) The method of claim 15, wherein the duration of the monitoring window is UE-specific for the UE based at least in part the UE capability message. ### Claim 18 (depends on 14) The method of claim 14, further comprising: receiving, in the uplink transmission, an indication that the UE reconfigured a first transmit chain of the UE. ### Claim 19 (depends on 18) The method of claim 18, wherein the indication comprises one or more bits via a resource determined using a resource allocation mechanism which is decided by a value in a beta-offset table. ### Claim 20 (depends on 19) The method of claim 19, wherein the value in the beta-offset table comprises one or more entries of a hybrid automatic repeat request (HARQ) table, or one or more entries of a channel state information (CSI) table, or a combination thereof. ### Claim 21 (depends on 19) The method of claim 19, wherein the beta-offset table is for the indication of monitoring windows used by the network device. ### Claim 22 (depends on 14) The method of claim 14, wherein the monitoring window spans one or more slots, with a first slot of the one or more slots comprising a slot in which the uplink transmission is scheduled. ### Claim 23 (depends on 14) The method of claim 14, wherein the uplink transmission comprises an uplink data signal transmission, or an uplink control signal transmission, or a reference signal transmission, or a physical random access channel (PRACH) transmission, or a combination thereof. ### Claim 24 (depends on 14) The method of claim 14, wherein the control signal comprises a radio resource control (RRC) grant, or a downlink control information (DCI) grant, or a combination thereof. ### Claim 25 (depends on 14) The method of claim 14, wherein the indication of the duration of the monitoring window is transmitted in a radio resource control (RRC) configuration signal, or a RRC reconfiguration signal, or a system information signal, or a combination thereof. ### Claim 26 A user equipment (UE) for wireless communication, comprising: a processor, memory coupled with the processor; and instructions stored in the memory and executable by the processor to cause the UE to: receive, from a network device, an indication of a duration of a monitoring window used by the network device to monitor for uplink transmissions from the UE, wherein the duration of the monitoring window is associated with a switching time of the UE; receive a control signal scheduling uplink resources for an uplink transmission by the UE on at least a first component carrier, the first component carrier in a first radio frequency spectrum band; reconfigure, in response to the received control signal, a first transmit chain of the UE from a second component carrier in a second radio frequency spectrum band to the first component carrier in the first radio frequency spectrum band for the uplink transmission; and transmit, within the duration of the monitoring window and using at least the reconfigured first transmit chain, the uplink transmission on the first component carrier using the scheduled uplink resources. ### Claim 27 (depends on 26) The UE of claim 26, wherein the instructions are further executable by the processor to cause the UE to: identify a timing for the uplink transmission based at least in part on a timing offset indicated by the received control signal; determine, based at least in part on the identified timing, that the first transmit chain can be reconfigured before expiration of the indicated monitoring window; and reconfigure the first transmit chain based on the determining. ### Claim 28 (depends on 26) The UE of claim 26, wherein the instructions are further executable by the processor to cause the UE to: transmit a UE capability message indicating a reconfiguration time for the first transmit chain, wherein the duration of the monitoring window is based at least in part on the UE capability message. ### Claim 29 (depends on 28) The UE of claim 28, wherein the duration of the monitoring window is cell-specific and based at least in part on a largest switching gap reported by at least one UE to the network device. ### Claim 30 (depends on 28) The UE of claim 28, wherein the duration of the monitoring window is UE-specific for the UE based at least in part the UE capability message. ### Claim 31 (depends on 26) The UE of claim 26, wherein the instructions are further executable by the processor to cause the UE to: transmit, in the uplink transmission, an indication that the UE has reconfigured the first transmit chain of the UE. ### Claim 32 (depends on 26) The UE of claim 26, wherein the monitoring window spans one or more slots, with a first slot of the one or more slots comprising a slot in which the uplink transmission is scheduled. ### Claim 33 (depends on 26) The UE of claim 26, wherein the uplink transmission comprises an uplink data signal transmission, or an uplink control signal transmission, or a reference signal transmission, a physical random access channel (PRACH), or a combination thereof. ### Claim 34 A network device for wireless communication, comprising: a processor, memory coupled with the processor; and instructions stored in the memory and executable by the processor to cause the network device to: determine, based at least in part on a capability of a user equipment (UE), a duration of a monitoring window to use to monitor for uplink transmissions from the UE, wherein the duration of the monitoring is associated with a switching time of the UE in accordance with the capability of the UE; transmit, to the UE, an indication of the monitoring window; transmit, to the UE, a control signal scheduling uplink resources for an uplink transmission by the UE on at least a first component carrier, the first component carrier in a first radio frequency spectrum band; and receive, within the duration of the monitoring window, the uplink transmission on the first component carrier using the scheduled uplink resources. ### Claim 35 An apparatus for wireless communication at a user equipment (UE), comprising: means for receiving, from a network device, an indication of a duration of a monitoring window used by the network device to monitor for uplink transmissions from the UE, wherein the duration of the monitoring window is associated with a switching time of the UE; means for receiving a control signal scheduling uplink resources for an uplink transmission by the UE on at least a first component carrier, the first component carrier in a first radio frequency spectrum band; means for reconfiguring, in response to the received control signal, a first transmit chain of the UE from a second component carrier in a second radio frequency spectrum band to the first component carrier in the first radio frequency spectrum band for the uplink transmission; and means for transmitting, within the duration of the monitoring window and using at least the reconfigured first transmit chain, the uplink transmission on the first component carrier using the scheduled uplink resources.