# US 12,772,270 B2 · Methods and apparatuses of selecting a carrier for a sidelink multi-carrier operation > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,772,270 B2 - Document ID: US12772270B2 - Status: Granted - Kind: B2 - Application number: 18/688,234 - Filed: 2021-09-06 - Published: 2024-12-05 - Granted: 2026-10-20 - Earliest claimed: 2021-09-06 - Assignees: Lenovo (Beijing) Limited - Applicants: Lenovo (Beijing) Limited - Inventors: Jing Han; Mingzeng Dai; Congchi Zhang; Haiming Wang; Lianhai Wu - Web page: https://patentgrep.com/patent/US12772270B2 ## CPC - H04W 72/40: Resource management for direct mode communication, e.g. D2D or sidelink - H04W 72/12: Wireless traffic scheduling - H04W 92/18: between terminal devices - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Embodiments of the present disclosure relate to methods and apparatuses of selecting a carrier for a sidelink multi-carrier operation in 3GPP (3rd Generation Partnership Project) 5G networks. According to an embodiment of the present disclosure, a UE includes a processor and a wireless transceiver coupled to the processor; and the processor of the UE is configured: to transmit, via the wireless transceiver to a network node, at least one of carrier quality information and carrier problem information of a sidelink (SL) between the UE and a further UE, in response to data to be transmitted on the SL or data already transmitted on one or more carriers of the SL and in response to the network node scheduling a carrier for a data transmission on the SL; or to determine whether the at least one of the carrier quality information and the carrier problem information of the SL fulfills a carrier selection or reselection condition, in response to the processor of the UE scheduling the carrier for the data transmission on the SL; and to select a carrier from multiple carriers configured on the SL, in response to the at least one of the carrier quality information and the carrier problem information of the SL fulfilling the carrier selection or reselection condition. ## Claims ### Claim 1 A first user equipment (UE) for wireless communication, comprising: at least one memory; and at least one processor coupled with the at least one memory and operable to cause the first UE to: transmit, in a first mode associated with a base station scheduling a carrier for a data transmission on a sidelink (SL) between the first UE and a second UE, signaling to the base station, wherein the signaling indicates at least one of carrier quality information or carrier problem information associated with multiple carriers configured on the SL, and wherein the signaling is transmitted based at least in part on data that is to be transmitted on the SL or that is already transmitted on the SL; determine, in a second mode associated with the UE scheduling the carrier for the data transmission on the SL, whether at least one of the carrier quality information or the carrier problem information fulfills a carrier selection or reselection condition; determine, in the first mode and in the second mode, the carrier from the multiple carriers based at least in part on the carrier quality information and the carrier problem information, wherein the carrier problem information indicates whether a carrier failure has occurred on at least one carrier of the multiple carriers; and transmit the data transmission on the SL based at least in part on the carrier. ### Claim 2 (depends on 1) The first UE of claim 1, wherein to determine the carrier, the at least one processor is operable to cause the first UE to receive, in the first mode and from the base station, additional signaling that indicates the carrier. ### Claim 3 (depends on 1) The first UE of claim 1, wherein the at least one processor is further operable to cause the first UE to at least one of: determine the carrier quality information based at least in part on a sidelink measurement report from the second UE or pathloss related information maintained by the first UE; and determine the carrier problem information by monitoring for the carrier failure. ### Claim 4 (depends on 1) The first UE of claim 1, wherein the at least one processor is further operable to cause the first UE to at least one of: receive, from the base station, additional signaling that configures the carrier quality information; obtain the carrier quality information from a pre-configuration stored at the first UE; receive, from the second UE, the carrier quality information; or receive, from the second UE, information, wherein the carrier quality information is maintained by the first UE based at least in part on the information. ### Claim 5 (depends on 1) The first UE of claim 1, wherein the carrier quality information is based at least in part on at least one of: a measurement result that indicates an SL reference signal received power (SL-RSRP) of the carrier; a sub-carrier spacing (SCS) parameter for the carrier; or pathloss information associated with the carrier. ### Claim 6 (depends on 1) The first UE of claim 1, wherein the carrier selection or reselection condition comprises at least one of: the first UE receiving a first measurement report from the second UE, wherein the first measurement report indicates that a measurement result for the carrier is greater than a first measurement threshold; the first UE failing to receive a second measurement report from the second UE, wherein the second measurement report indicates that the measurement result for the carrier is less than a second measurement threshold; a total number of wireless transceivers of the first UE associated with receiving the second measurement report being less than a number threshold; an SL reference signal received power (RSRP) measured on the carrier being greater than a RSRP threshold; the SL RSRP measured on the carrier being greater than the RSRP threshold for a first time period; a channel busy ratio (CBR) measured on the carrier being less than a CBR threshold; SL pathloss information associated with the carrier being less than a pathloss threshold; the SL pathloss information being less than the pathloss threshold for a second time period; or a sub-carrier spacing (SCS) parameter for the carrier being included in a list of allowed SCS parameters, wherein the list is configured for a logical channel (LCH) of the first UE. ### Claim 7 (depends on 6) The first UE of claim 6, wherein at least one of the first measurement threshold, the second measurement threshold, the number threshold, the RSRP threshold, the CBR threshold, or the pathloss threshold is associated with a priority, and wherein the at least one processor is further operable to cause the first UE to determine at least one of the first measurement threshold, the second measurement threshold, the number threshold, the RSRP threshold, the CBR threshold, or the pathloss threshold based at least in part on an associated priority of the data, wherein at least one of the first measurement threshold, the second measurement threshold, the number threshold, the RSRP threshold, the CBR threshold, or the pathloss threshold is configured or pre-configured by the base station. ### Claim 8 (depends on 1) The first UE of claim 1, wherein the carrier problem information is based at least in part on at least one of: a first SL grant unavailable case occurring on the at least one carrier based at least in part on a re-evaluation operation on the SL; a second SL grant unavailable case occurring on the at least one carrier based at least in part on a pre-emption operation on the SL; a third SL grant unavailable case occurring on the at least one carrier based at least in part on at least one of an uplink (UL) prioritization procedure or an SL prioritization procedure; a radio link failure (RLF) on the at least one carrier; a radio link control (RLC) retransmission total number; or a consecutive hybrid automatic repeat request (HARQ) discontinuous transmission (DTX) or negative acknowledgement (NACK) total number. ### Claim 9 (depends on 8) The first UE of claim 8, wherein the carrier selection or reselection condition includes at least one of: a first number of one or more unavailable SL grants caused by the re-evaluation operation being greater than or equal to a first threshold; a second number of one or more unavailable SL grants caused by the pre-emption operation being greater than or equal to a second threshold; a third number of one or more de-prioritized SL grants caused by the UL prioritization procedure or the SL prioritization procedure being greater than or equal to a third threshold; the RLF being declared for the at least one carrier; an RLC retransmission total number on the at least one carrier being greater than or equal to a fourth threshold; the RLC retransmission total number on the at least one carrier being greater than or equal to the fourth threshold during a third time period; a consecutive HARQ DTX or NACK total number on the carrier within the multiple carriers being greater than or equal to a fifth threshold; and the consecutive HARQ DTX or NACK total number on the carrier being greater than or equal to the fifth threshold during a fourth time period. ### Claim 10 (depends on 9) The first UE of claim 9, wherein the at least one processor is further operable to cause the first UE to refrain from releasing a PC5 radio resource control (RRC) connection of the carrier based at least in part on the RLF and one or more additional carriers of the multiple carriers being available. ### Claim 11 (depends on 1) The first UE of claim 1, wherein the at least one processor is further operable to cause the first UE to: start a timer based at least in part on a problem occurring on an additional carrier of the multiple carriers; and refrain from selecting the additional carrier based at least in part on the timer running. ### Claim 12 (depends on 1) The first UE of claim 1, wherein the at least one processor is further operable to cause the first UE to: determine, after starting the data transmission on the carrier, that additional data is available to be transmitted on the SL; determine whether at least one of the carrier quality information or the carrier problem information fulfills the carrier selection or reselection condition associated with a set of thresholds; refrain from triggering a carrier re-selection procedure based at least in part on the carrier fulfilling the carrier selection or reselection condition associated with the set of thresholds; and transmit, based at least in part on refraining from triggering the carrier re-selection procedure, the additional data on the carrier. ### Claim 13 A base station for wireless communication, comprising: at least one memory; and at least one processor coupled with the at least one memory and operable to cause the base station to: receive, in a mode associated with the base station scheduling a carrier for a data transmission on a sidelink (SL) between a first user equipment (UE) and a second UE, first signaling from the first UE, wherein the first signaling indicates carrier quality information and carrier problem information associated with multiple carriers configured on the SL, and wherein the first signaling is received based at least in part on data that is to be transmitted on the SL or that is already transmitted on the SL; select the carrier from the multiple carriers based at least in part on the carrier quality information and the carrier problem information, wherein the carrier problem information indicates whether a carrier failure has occurred on at least one carrier of the multiple carriers; and transmit, to the first UE, second signaling that indicates the carrier for the data transmission on the SL. ### Claim 14 A method performed by a first user equipment (UE), the method comprising: transmitting, in a first mode associated with a base station scheduling a carrier for a data transmission on a sidelink (SL) between the first UE and a second UE, signaling to the base station, wherein the signaling indicates at least one of carrier quality information or carrier problem information associated with multiple carriers configured on the SL, and wherein the signaling is transmitted based at least in part on data that is to be transmitted on the SL or that is already transmitted on the SL; determining, in a second mode associated with the UE scheduling the carrier for the data transmission on the SL, whether the at least one of the carrier quality information or the carrier problem information fulfills a carrier selection or reselection condition; determining, in the first mode and in the second mode, the carrier from the multiple carriers based at least in part on the carrier quality information and the carrier problem information, wherein the carrier problem information indicates whether a carrier failure has occurred on at least one carrier of the multiple carriers; and transmitting the data transmission on the SL based at least in part on the carrier. ### Claim 15 A method performed by a base station, the method comprising: receiving, in a mode associated with the base station scheduling a carrier for a data transmission on a sidelink (SL) between a first user equipment (UE) and a second UE, first signaling from the first UE, wherein the first signaling indicates carrier quality information and carrier problem information associated with multiple carriers configured on the SL, and wherein the first signaling is received based at least in part on data that is to be transmitted on the SL or that is already transmitted on the SL; selecting the carrier from the multiple carriers based at least in part on the carrier quality information and the carrier problem information, wherein the carrier problem information indicates whether a carrier failure has occurred on at least one carrier of the multiple carriers; and transmitting, to the first UE, second signaling that indicates the carrier for the data transmission on the SL. ### Claim 16 (depends on 1) The first UE of claim 1, wherein the at least one processor is further operable to cause the first UE to: determine, after starting the data transmission on the carrier, that no data is being transmitted on the carrier and that additional data is available to be transmitted on the SL; determine whether at least one of the carrier quality information or the carrier problem information fulfills the carrier selection or reselection condition associated with a set of thresholds; and transmit the additional data on the carrier based at least in part on the carrier fulfilling the carrier selection or reselection condition associated with the set of thresholds. ### Claim 17 (depends on 1) The first UE of claim 1, wherein to determine the carrier, the at least one processor is operable to cause the first UE to select, in the second mode, the carrier. ### Claim 18 (depends on 13) The base station of claim 13, wherein the carrier quality information is based at least in part on a sidelink measurement report from the second UE or pathloss related information maintained by the first UE. ### Claim 19 (depends on 13) The base station of claim 13, wherein the at least one processor is further operable to cause the base station to transmit, to the first UE, third signaling that configures the carrier quality information. ### Claim 20 (depends on 13) The base station of claim 13, wherein the carrier quality information is based at least in part on at least one of: a measurement result that indicates an SL reference signal received power (SL-RSRP) of the carrier; a sub-carrier spacing (SCS) parameter for the carrier; or pathloss information associated with the carrier.