# US 12,192,994 B2 · Collision handling for component carrier switching > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,192,994 B2 - Document ID: US12192994B2 - Status: Granted - Kind: B2 - Application number: 17/755,575 - Filed: 2020-02-11 - Published: 2022-12-01 - Granted: 2025-01-07 - Earliest claimed: 2019-11-21 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Peter Gaal; Yiqing Cao; Chenxi Hao; Yi Huang; Bo Chen - Web page: https://patentgrep.com/patent/US12192994B2 ## CPC - H04W 72/1268: of uplink data flows - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W 72/569: {of the traffic information} - H04W 74/0825: {with collision detection} - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may group, into a common slot, a first plurality of consecutive uplink slots included in a first component carrier and a second plurality of consecutive uplink slots included in a second component carrier. The UE may determine whether an uplink transmission is scheduled in at least one of the first plurality of consecutive uplink slots or the second plurality of consecutive uplink slots. The UE may transmit on the first component carrier or on the second component carrier in the common slot or determine whether to switch a transmit chain based at least in part on whether an uplink transmission is scheduled in at least one of the first plurality of consecutive uplink slots or the second plurality of consecutive uplink slots. Numerous other aspects are provided. ## Claims ### Claim 1 A method of wireless communication performed by a user equipment (UE), comprising: grouping, into a common slot, a plurality of first uplink slots included in a first component carrier and a plurality of second uplink slots included in a second component carrier, wherein at least a subset of the plurality of first uplink slots and at least a subset of the first plurality of second uplink slots overlap; and transmitting, based at least in part on an uplink transmission that is scheduled in at least one of the plurality of first uplink slots or the plurality of second uplink slots, on the first component carrier or on the second component carrier in the common slot, or switching, when no uplink transmission is scheduled in at least one of the plurality of first uplink slots or the plurality of second uplink slots, a transmit chain of the UE between the first component carrier and the second component carrier in the common slot prior to a transmission and based at least in part on receiving scheduling signaling, or refraining from switching, when no uplink transmission is scheduled in at least one of the plurality of first uplink slots or the plurality of second uplink slots, a transmit chain of the UE between the first component carrier and the second component carrier in the common slot based at least in part on not receiving scheduling signaling. ### Claim 2 (depends on 1) The method of claim 1, wherein an indication that a collision occurs for the UE in the common slot is based on: a first uplink transmission is being scheduled in at least a subset of the plurality of first uplink slots; and a second uplink transmission being scheduled in at least a subset of the plurality of second uplink slots. ### Claim 3 (depends on 2) The method of claim 2, wherein transmitting on the first component carrier or on the second component carrier in the common slot comprises: transmitting, based on the collision and based on a first priority associated with the first component carrier and a second priority associated with the second component carrier, the first uplink transmission on the first component carrier in the common slot or the second uplink transmission on the second component carrier in the common slot. ### Claim 4 (depends on 3) The method of claim 3, further comprising: switching the transmit chain of the UE to a default component carrier after transmitting the first uplink transmission or the second uplink transmission. ### Claim 5 (depends on 3) The method of claim 3, wherein transmitting on the first component carrier or on the second component carrier in the common slot comprises: transmitting the first uplink transmission on the first component carrier in the common slot based on the first priority being greater relative to the second priority. ### Claim 6 (depends on 5) The method of claim 5, wherein the first priority is greater relative to the second priority based on at least one of: the first component carrier being associated with a primary cell of the UE, the first component carrier being a lower frequency relative to the second component carrier, or receiving, from a base station (BS), an indication of the first priority and the second priority. ### Claim 7 (depends on 2) The method of claim 2, wherein an error occurs based on the collision, and wherein transmitting on the first component carrier or on the second component carrier in the common slot comprises: refraining, based on the error, from transmitting on the first component carrier or on the second component carrier in the common slot, transmitting, based on the error, the first uplink transmission on the first component carrier in the common slot or transmitting the second uplink transmission on the second component carrier in the common slot, or transmitting, based on the error, the first uplink transmission on the first component carrier in the common slot based on the first component carrier being associated with a primary cell of the UE. ### Claim 8 (depends on 2) The method of claim 2, further comprising: switching, based on the collision, the transmit chain of the UE between the first component carrier and the second component carrier in a first slot that occurs after a permitted carrier switching boundary. ### Claim 9 (depends on 2) The method of claim 2, further comprising: switching, based on the collision, the transmit chain of the UE between the first component carrier and the second component carrier in a first slot that occurs after a permitted carrier switching boundary and after one or more other slots for which scheduling signaling was received at a same time as or before scheduling signaling was received for the first slot. ### Claim 10 (depends on 2) The method of claim 2, further comprising: switching, based on the collision, the transmit chain of the UE between the first component carrier and the second component carrier before or after any slot boundary of the common slot. ### Claim 11 A user equipment (UE), comprising: one or more transceivers; one or more memories comprising instructions; and one or more processors configured to execute the instructions and cause the UE to: group, into a common slot, a plurality of first uplink slots included in a first component carrier and a plurality of second uplink slots included in a second component carrier, wherein at least a subset of the plurality of first uplink slots and at least a subset of the plurality of second first uplink slots overlap; and transmit, via the one or more transceivers, based at least in part on an uplink transmission that is scheduled in at least one of the plurality of first uplink slots or the plurality of second uplink slots, on the first component carrier or on the second component carrier in the common slot, or switch, when no uplink transmission is scheduled in at least one of the plurality of first uplink slots or the plurality of second uplink slots, a transmit chain of the UE between the first component carrier and the second component carrier in the common slot prior to a transmission and based on receiving scheduling signaling, or refrain from switching, when no uplink transmission is scheduled in at least one of the plurality of first uplink slots or the plurality of second uplink slots, a transmit chain of the UE between the first component carrier and the second component carrier in the common slot based on not receiving scheduling signaling. ### Claim 12 (depends on 11) The UE of claim 11, wherein an indication that a collision occurs for the UE in the common slot is based on: a first uplink transmission that is scheduled in at least a subset of plurality of first uplink slots; and a second uplink transmission that is scheduled in at least a subset of plurality of the second uplink slots. ### Claim 13 (depends on 12) The UE of claim 12, wherein the one or more processors, when transmitting on the first component carrier or on the second component carrier in the common slot, are configured to cause the UE to: transmit, via the one or more transceivers, based on the collision, and based on a first priority associated with the first component carrier and a second priority associated with the second component carrier, the first uplink transmission on the first component carrier in the common slot or the second uplink transmission on the second component carrier in the common slot. ### Claim 14 (depends on 13) The UE of claim 13, wherein the one or more processors are further configured to cause the UE to: switch the transmit chain of the UE to a default component carrier after transmitting the first uplink transmission or the second uplink transmission. ### Claim 15 (depends on 13) The UE of claim 13, wherein the one or more processors, when transmitting on the first component carrier or on the second component carrier in the common slot, are configured to cause the UE to: transmit, via the one or more transceivers, the first uplink transmission on the first component carrier in the common slot based on the first priority being greater relative to the second priority. ### Claim 16 (depends on 15) The UE of claim 15, wherein the first priority is greater relative to the second priority based on at least one of: the first component carrier being associated with a primary cell of the UE, the first component carrier being a lower frequency relative to the second component carrier, or a received indication of the first priority and the second priority. ### Claim 17 (depends on 12) The UE of claim 12, wherein an error occurs based on the collision, and wherein the one or more processors, when transmitting on the first component carrier or on the second component carrier in the common slot, are configured to cause the UE to: refrain, based the error, from transmitting on the first component carrier or on the second component carrier in the common slot, transmit, via the one or more transceivers and based the error, the first uplink transmission on the first component carrier in the common slot or transmitting the second uplink transmission on the second component carrier in the common slot, or transmit, via the one or more transceivers and based on the error, the first uplink transmission on the first component carrier in the common slot based on the first component carrier being associated with a primary cell of the UE. ### Claim 18 (depends on 12) The UE of claim 12, wherein the one or more processors are further configured to cause the UE to: switch, based on the collision, the transmit chain of the UE between the first component carrier and the second component carrier in a first slot that occurs after a permitted carrier switching boundary. ### Claim 19 (depends on 12) The UE of claim 12, wherein the one or more processors are further configured to cause the UE to: switch, based on the collision, the transmit chain of the UE between the first component carrier and the second component carrier in a first slot that occurs after a permitted carrier switching boundary and after one or more other slots for which scheduling signaling was received at a same time as scheduling signaling was received for the first slot. ### Claim 20 (depends on 12) The UE of claim 12, wherein the one or more processors are further configured to cause the UE to: switch, based on the collision, the transmit chain of the UE between the first component carrier and the second component carrier before or after any slot boundary of the common slot. ### Claim 21 (depends on 11) The UE of claim 11, wherein: an uplink transmission is scheduled in at least a subset of the plurality of first uplink slots, no scheduling signaling has been received for the plurality of second uplink slots, and wherein the one or more processors, when transmitting on the first component carrier or on the second component carrier in the common slot, are configured to cause the UE to: transmit, via the one or more transceivers, the uplink transmission on the first component carrier in the common slot based on determining that no scheduling signaling being received for the plurality of second uplink slots. ### Claim 22 (depends on 21) The UE of claim 21, wherein an indication that no scheduling signaling has been received for the one or more second uplink slots is based on: a search of downlink control information (DCI) associated with the plurality of second uplink slots for scheduling signaling; and a search, after searching the DCI associated with the plurality of second uplink slots, of a radio resource control configuration associated with the second uplink slots for scheduling signaling. ### Claim 23 (depends on 21) The UE of claim 21, wherein an indication that no scheduling signaling has been received for the one or more second uplink slots is based on: a search of a radio resource control (RRC) configuration associated with the second uplink slots for scheduling signaling; and a search, after searching the RRC configuration associated with the plurality of second uplink slots, of downlink control information associated with the plurality of second uplink slots for scheduling signaling. ### Claim 24 (depends on 11) The UE of claim 11, wherein the one or more processors, when refraining from switching the transmit chain of the UE between the first component carrier and the second component carrier in the common slot, are configured to cause the UE to: refrain from switching the transmit chain of the UE between the first component carrier and the second component carrier in the common slot until receiving a scheduling communication that causes the UE to switch the transmit chain of the UE between the first component carrier and the second component carrier, switch to the first component carrier in the common slot based on the first component carrier being a default component carrier of the UE, switch to the first component carrier in the common slot based on the first component carrier being associated with a primary cell of the UE, or switch to the first component carrier in the common slot based on the first component carrier being a lower frequency relative to the second component carrier. ### Claim 25 (depends on 11) The UE of claim 11, wherein the first component carrier is included in a first component carrier group; and wherein the second component carrier is included in a second component carrier group. ### Claim 26 (depends on 25) The UE of claim 25, wherein simultaneous uplink transmissions are not permitted across component carriers in the first component carrier group; and wherein simultaneous uplink transmissions are not permitted across component carriers in the second component carrier group. ### Claim 27 (depends on 25) The UE of claim 25, wherein the one or more processors are further configured to cause the UE to: receive scheduling signaling from a primary cell in the first component carrier group; and receive scheduling signaling from a primary cell in the second component carrier group. ### Claim 28 (depends on 11) The UE of claim 11, wherein the first component carrier is a time division multiplexed component carrier that supports two or more transmit ports; and wherein the first component carrier supports switching between consecutive uplink slots or within uplink slots. ### Claim 29 A non-transitory computer-readable medium storing one or more instructions for wireless communication, the one or more instructions comprising: one or more instructions that, when executed by one or more processors of a user equipment (UE), cause the one or more processors to: group, into a common slot, a plurality of first uplink slots included in a first component carrier and a plurality of second uplink slots included in a second component carrier, wherein at least a subset of the plurality of first uplink slots and at least a subset of the plurality of second first uplink slots overlap; and transmit, based at least in part on an uplink transmission that is scheduled in at least one of the plurality of first uplink slots or the plurality of second uplink slots, on the first component carrier or on the second component carrier in the common slot, or switch, when no uplink transmission is scheduled in at least one of the plurality of first uplink slots or the plurality of second uplink slots, a transmit chain of the UE between the first component carrier and the second component carrier in the common slot prior to a transmission and based on receiving scheduling signaling, or refrain from switching, when no uplink transmission is scheduled in at least one of the plurality of first uplink slots or the plurality of second uplink slots, a transmit chain of the UE between the first component carrier and the second component carrier in the common slot based on not receiving scheduling signaling. ### Claim 30 (depends on 29) The non-transitory computer-readable medium of claim 29, wherein an indication that a collision occurs for the UE in the common slot is based on: a first uplink transmission that is scheduled in at least a subset of the plurality of first uplink slots; and a second uplink transmission that is scheduled in at least a subset of plurality of the second uplink slots. ### Claim 31 (depends on 30) The non-transitory computer-readable medium of claim 30, wherein the one or more instructions, that cause the one or more processors to transmit on the first component carrier or on the second component carrier in the common slot, cause the one or more processors to: transmit, based on the collision and based on a first priority associated with the first component carrier and a second priority associated with the second component carrier, the first uplink transmission on the first component carrier in the common slot or the second uplink transmission on the second component carrier in the common slot. ### Claim 32 (depends on 31) The non-transitory computer-readable medium of claim 31, wherein the one or more instructions, when executed by the one or more processors, further cause the one or more processors to: switch the transmit chain of the UE to a default component carrier after transmitting the first uplink transmission or the second uplink transmission. ### Claim 33 A user equipment (UE) for wireless communication, comprising: means for grouping, into a common slot, a plurality of first uplink slots included in a first component carrier and a plurality of second uplink slots included in a second component carrier, wherein at least a subset of the plurality of first uplink slots and at least a subset of the plurality of second first uplink slots overlap; and means for transmitting, based at least in part on an uplink transmission that is scheduled in at least one of the plurality of first uplink slots or the plurality of second uplink slots, on the first component carrier or on the second component carrier in the common slot, or means for switching, when no uplink transmission is scheduled in at least one of the plurality of first uplink slots or the plurality of second uplink slots, a transmit chain of the UE between the first component carrier and the second component carrier in the common slot prior to a transmission and based at least in part on receiving scheduling signaling, or means for refraining from switching, when no uplink transmission is scheduled in at least one of the plurality of first uplink slots or the plurality of second uplink slots, a transmit chain of the UE between the first component carrier and the second component carrier in the common slot based at least in part on not receiving scheduling signaling. ### Claim 34 (depends on 33) The UE of claim 33, wherein an indication that a collision occurs for the UE in the common slot is based on: a first uplink transmission that is scheduled in at least a subset of the plurality of first uplink slots; and a second uplink transmission that is scheduled in at least a subset of the plurality of second uplink slots. ### Claim 35 (depends on 34) The UE of claim 34, wherein the means for transmitting on the first component carrier or on the second component carrier in the common slot comprises: means for transmitting, based on the collision and based on a first priority associated with the first component carrier and a second priority associated with the second component carrier, the first uplink transmission on the first component carrier in the common slot or the second uplink transmission on the second component carrier in the common slot.