Sidelink feedback preemption and uplink multiplexing in wireless communications

Abstract

Methods, systems, and devices for wireless communication are described in which multiple devices can implement sidelink communications for direct device-to-device information exchange. Such devices (e.g., user equipment (UE) devices) can be configured with resources for sidelink communications and can monitor for a sidelink preemption indication (SPI) from a base station and determine whether one or more sidelink communications are preempted based on the SPI. The sidelink communications can include feedback communications transmitted using sidelink feedback resources. Based on an indication in the received SPI, it can be determined whether to transmit sidelink feedback. The sidelink feedback can be transmitted to one or more other sidelink devices or a base station, and preemption of the sidelink feedback can be determined based on one or more parameters associated with the sidelink communications, associated with the SPI, or any combination thereof.

Description

[0001] Cross-references

[0002] This patent application claims priority to U.S. Patent Application No. 17 / 478,631, filed September 17, 2021, entitled “SIDELINK FEEDBACK PREEMPTION AND UPLINK MULTIPLEXING IN WIRELESS COMMUNICATIONS”, which claims the benefit of U.S. Provisional Patent Application No. 63 / 080,640, filed September 18, 2020, entitled “SIDELINK FEEDBACK PREEMPTION AND UPLINK MULTIPLEXING IN WIRELESS COMMUNICATIONS”, which has been assigned to the assignee of this application and is expressly incorporated herein by reference. Technical Field

[0003] The following discussion pertains to wireless communication, including sidelink feedback preemption and uplink multiplexing in wireless communication. Background Technology

[0004] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, message sending and receiving, and broadcasting. These systems can support communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multiple access systems include fourth-generation (4G) systems such as Long Term Evolution (LTE), LTE-A Advanced (LTE-A), or LTE-A Pro systems, and fifth-generation (5G) systems, which may be referred to as New Radio (NR) systems. These systems can employ technologies such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), or Discrete Fourier Transform Extended Orthogonal Frequency Division Multiplexing (DFT-S-OFDM). A wireless multiple access communication system may include one or more base stations or one or more network access nodes, each of which simultaneously supports communication for multiple communication devices, which may also be referred to as User Equipment (UE).

[0005] In some deployments, a UE can communicate with one or more base stations using an access link (e.g., via the Uu interface in a 4G or 5G system). Additionally, some UEs can communicate directly with one or more other UEs using a sidelink (e.g., the PC5 interface), allowing for some communications to be conducted directly by the UE rather than through a base station. In some cases, the base station can configure resources for sidelink communication, and the UE can use these configured sidelink resources for direct communication via the sidelink. Efficient allocation and use of sidelink resources in such deployments can help improve network efficiency, reliability, and latency, and is therefore often desirable. Summary of the Invention

[0006] The described technology relates to improved methods, systems, devices, and apparatuses supporting sidelink feedback preemption and uplink multiplexing in wireless communications. According to various aspects, the described technology provides an identifier for a set of sidelink feedback resources used to provide feedback indications (e.g., Hybrid Automatic Repeat Request (HARQ) Acknowledgment / Negative Acknowledgment (ACK / NACK) feedback) associated with sidelink communication. A sidelink user equipment (UE) can receive a sidelink preemption indication (SPI) from a base station, indicating that one or more sidelink communications have been preempted.

[0007] In some cases, based on the SPI, the UE can determine whether to send sidelink feedback. In some cases, the UE can cancel the transmission of one or more sidelink data using resources indicated by the SPI (e.g., Physical Sidelink Shared Channel (PSSCH) transmission), but can still send sidelink feedback (e.g., using Physical Sidelink Feedback Channel (PSFCH) resources). In other cases, the UE can preempt the transmission of sidelink feedback. In some cases, whether to send or preempt sidelink feedback can be based at least in part on one or more of the following: the priority of the sidelink communication associated with the sidelink feedback, the priority indicated in the SPI, whether the sidelink communication is unicast or multicast, a Reference Signal Received Power (RSRP) measurement, the SPI's partition identifier, the resource pool ID indicated by the SPI, or any combination thereof.

[0008] In some cases, the UE transmitting sidelink communication (e.g., PSSCH transmission) can receive feedback from the receiving UE, and the transmitting UE can report the feedback to the serving base station in the feedback report (e.g., for the allocation of additional sidelink resources, such as for one or more retransmissions). In some cases, when the SPI is associated with sidelink communication, sidelink feedback, or both, the indication of sidelink feedback in the feedback report can be omitted. In other cases, when the SPI is associated with sidelink communication, sidelink feedback, or both; or based on the absence of sidelink feedback from the receiving UE, the transmitting sidelink UE can report a NACK for the sidelink feedback in the feedback report. Such NACK indications can be provided in the feedback report within a uniform-size uplink control information (UCI) transmission expected at the base station.

[0009] A method for wireless communication at a first UE is described. The method may include: receiving sidelink communication from a second UE via a sidelink channel between the first UE and the second UE; identifying a set of sidelink feedback resources for feedback transmission to the second UE; providing feedback associated with the sidelink communication from the second UE; receiving a sidelink preemption indication indicating that one or more sidelink communications between the first UE and the second UE have been preempted; and determining, based on the sidelink preemption indication, whether to transmit feedback to the second UE via the set of sidelink feedback resources.

[0010] An apparatus for wireless communication at a first UE is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions can be executed by the processor to cause the apparatus to: receive sidelink communication from the second UE via a sidelink channel between the first UE and the second UE; identify a set of sidelink feedback resources for feedback transmission to the second UE, the feedback transmission providing feedback associated with the sidelink communication from the second UE; receive a sidelink preemption indication indicating that one or more sidelink communications between the first UE and the second UE have been preempted; and determine, based on the sidelink preemption indication, whether to transmit feedback to the second UE via the set of sidelink feedback resources.

[0011] Another apparatus for wireless communication at a first UE is described. The apparatus may include components for: receiving sidelink communication from a second UE via a sidelink channel between the first UE and the second UE; identifying a set of sidelink feedback resources for feedback transmission to the second UE, the feedback transmission providing feedback associated with the sidelink communication from the second UE; receiving a sidelink preemption indication indicating that one or more sidelink communications between the first UE and the second UE have been preempted; and determining, based on the sidelink preemption indication, whether to transmit feedback to the second UE via the set of sidelink feedback resources.

[0012] A non-transitory computer-readable medium is described, storing code for wireless communication at a first UE. The code may include instructions executable by a processor to: receive sidelink communication from the second UE via a sidelink channel between the first UE and the second UE; identify a set of sidelink feedback resources for feedback transmission to the second UE, the feedback transmission providing feedback associated with the sidelink communication from the second UE; receive a sidelink preemption indication indicating that one or more sidelink communications between the first UE and the second UE have been preempted; and determine, based on the sidelink preemption indication, whether to send a feedback transmission to the second UE via the set of sidelink feedback resources.

[0013] In some examples of the methods, apparatuses, and nontransitory computer-readable media described herein, determining may include operations, features, components, or instructions for: determining that feedback transmission should be sent when a sidelink preemption indication is associated with a sidelink feedback resource set, and sending the feedback transmission via the sidelink feedback resource set. Some examples of the methods, apparatuses, and nontransitory computer-readable media described herein may also include operations, features, components, or instructions for: determining that feedback transmission should be preempted when a sidelink preemption indication is associated with a sidelink feedback resource set, and preempting feedback transmission via the sidelink feedback resource set. Some examples of the methods, apparatuses, and nontransitory computer-readable media described herein may also include operations, features, components, or instructions for: receiving configuration information indicating whether feedback transmission using sidelink feedback resources should be preempted when a sidelink preemption indication is associated with a sidelink feedback resource set, and sending or preempting feedback transmission based on the configuration information.

[0014] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, configuration information may be associated with a first UE, with a resource pool in a resource pool set, with a carrier in a carrier set, or any combination thereof. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, configuration information may be received together with sidelink configuration for sidelink communication, received in radio resource control signaling from a serving base station, or any combination thereof.

[0015] In some examples of the methods, apparatuses, and nontransitory computer-readable media described herein, determination may be based on one or more parameters associated with sidelink communication and one or more corresponding parameters associated with a sidelink preemption indication. In some examples of the methods, apparatuses, and nontransitory computer-readable media described herein, one or more parameters include: the priority of the sidelink communication, the priority indicated by the sidelink preemption indication, the unicast or multicast transmission type associated with the sidelink communication, a reference signal received power (RSRP) measurement, a partition identifier indicated by the sidelink preemption indication, a resource pool identifier provided by the sidelink preemption indication, or any combination thereof. In some examples of the methods, apparatuses, and nontransitory computer-readable media described herein, the RSRP measurement may be associated with a reference signal from the serving base station, and wherein sidelink feedback transmission may be transmitted based on an RSRP at or below a receive power threshold provided by one or more parameters. In some examples of the methods, apparatuses, and nontransitory computer-readable media described herein, two or more individual RSRP thresholds may be provided for two or more priorities of the sidelink preemption indication, for two or more priorities of the sidelink communication, or any combination thereof.

[0016] In some examples of the methods, apparatuses and nontransitory computer-readable media described herein, the sidelink preemption indication provides one or more of the following: a time / frequency indication of the sidelink resource to be preempted, a priority associated with the sidelink preemption indication, a partition identifier, one or more reference signal received power thresholds for preemption determination, the periodicity of the preempted resource, a sidelink resource pool identifier, or any combination thereof.

[0017] A method for wireless communication at a first UE is described. The method may include: transmitting sidelink communication to a second UE via a sidelink channel between the first UE and the second UE; identifying a set of sidelink feedback resources associated with the reception of sidelink communication at the second UE and sidelink feedback from the second UE; receiving a sidelink preemption indication indicating that one or more sidelink communications between the first UE and the second UE have been preempted; and determining, based on the sidelink preemption indication, whether to transmit sidelink feedback from the second UE to a serving base station.

[0018] An apparatus for wireless communication at a first UE is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions can be executed by the processor to cause the apparatus to: transmit sidelink communication to the second UE via a sidelink channel between the first UE and the second UE; identify a set of sidelink feedback resources associated with the reception of sidelink communication at the second UE and sidelink feedback from the second UE; receive a sidelink preemption indication indicating that one or more sidelink communications between the first UE and the second UE have been preempted; and determine, based on the sidelink preemption indication, whether to transmit sidelink feedback from the second UE to a serving base station.

[0019] Another apparatus for wireless communication at a first UE is described. The apparatus may include components for: transmitting sidelink communication to a second UE via a sidelink channel between the first UE and the second UE; identifying a set of sidelink feedback resources associated with the reception of sidelink communication at the second UE and sidelink feedback from the second UE; receiving a sidelink preemption indication indicating that one or more sidelink communications between the first UE and the second UE have been preempted; and determining, based on the sidelink preemption indication, whether to transmit sidelink feedback from the second UE to a serving base station.

[0020] A non-transitory computer-readable medium is described, storing code for wireless communication at a first UE. The code may include instructions executable by a processor to: transmit sidelink communication to a second UE via a sidelink channel between the first UE and the second UE; identify a set of sidelink feedback resources associated with the reception of sidelink communication at the second UE; receive a sidelink preemption indication indicating that one or more sidelink communications between the first UE and the second UE have been preempted; and determine, based on the sidelink preemption indication, whether to transmit sidelink feedback from the second UE to a serving base station.

[0021] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, determining to preempt the transmission of sidelink feedback to the serving base station may include operations, features, components, or instructions for: determining to preempt the transmission of sidelink feedback to the serving base station based on a sidelink preemption indication indicating preemption of sidelink resources or a set of sidelink feedback resources associated with sidelink communication. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for: setting sidelink feedback from the second UE to indicate negative acknowledgment based on a sidelink preemption indication indicating preemption of sidelink resources associated with sidelink communication, and sending sidelink feedback to the serving base station. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for: setting sidelink feedback from the second UE to indicate negative acknowledgment based on a sidelink preemption indication indicating preemption of a set of sidelink feedback resources or based on the absence of sidelink feedback in the set of sidelink feedback resources. In some examples of the methods, apparatuses, and nontransitory computer-readable media described herein, the negative acknowledgment indication of sidelink feedback provides a uniform payload size for uplink control information transmission to the serving base station, including sidelink feedback. In some examples of the methods, apparatuses, and nontransitory computer-readable media described herein, the sidelink preemption indication provides one or more of the following: a time / frequency indication of the sidelink resource to be preempted, a priority associated with the sidelink preemption indication, a partition identifier, one or more reference signal received power thresholds for preemption determination, the periodicity of the preempted resource, a sidelink resource pool identifier, or any combination thereof.

[0022] A method for wireless communication at a base station is described. The method may include: sending configuration information to one or more UEs indicating whether feedback transmission using sidelink feedback resources should be preempted when a sidelink preemption indication is associated with a set of sidelink feedback resources; sending a sidelink preemption indication indicating that one or more sidelink communications between one or more UEs are preempted; and monitoring sidelink feedback from one or more UEs based on the sidelink preemption indication.

[0023] An apparatus for wireless communication at a base station is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions can be executed by the processor to cause the apparatus to: send configuration information to one or more UEs indicating whether feedback transmission using sidelink feedback resources should be preempted when a sidelink preemption indication is associated with a set of sidelink feedback resources; send a sidelink preemption indication indicating that one or more sidelink communications between one or more UEs are preempted; and monitor sidelink feedback from one or more UEs based on the sidelink preemption indication.

[0024] Another apparatus for wireless communication at a base station is described. The apparatus may include components for: sending configuration information to one or more UEs indicating whether feedback transmission using sidelink feedback resources should be preempted when a sidelink preemption indication is associated with a set of sidelink feedback resources; sending a sidelink preemption indication indicating that one or more sidelink communications between one or more UEs are preempted; and monitoring sidelink feedback from one or more UEs based on the sidelink preemption indication.

[0025] A non-transitory computer-readable medium is described that stores code for wireless communication at a base station. The code may include instructions executable by a processor to: send configuration information to one or more UEs indicating whether feedback transmission using sidelink feedback resources should be preempted when a sidelink preemption indication is associated with a set of sidelink feedback resources; send a sidelink preemption indication indicating that one or more sidelink communications between one or more UEs are preempted; and monitor sidelink feedback from one or more UEs based on the sidelink preemption indication.

[0026] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, a sidelink feedback indication is negatively acknowledged based on a sidelink preemption indication. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, a sidelink feedback indication from one or more UEs is negatively acknowledged based on a sidelink preemption indication indicating preemption of a set of sidelink feedback resources or based on the absence of sidelink feedback in the set of sidelink feedback resources.

[0027] In some examples of the methods, apparatuses, and nontransitory computer-readable media described herein, the negative acknowledgment indication of sidelink feedback provides a uniform payload size for the transmission of uplink control information, including sidelink feedback, to the base station. In some examples of the methods, apparatuses, and nontransitory computer-readable media described herein, the sidelink preemption indication provides one or more of the following: a time / frequency indication of the sidelink resource to be preempted, a priority associated with the sidelink preemption indication, a partition identifier, one or more reference signal received power thresholds for preemption determination, the periodicity of the preempted resource, a sidelink resource pool identifier, or any combination thereof. Attached Figure Description

[0028] Figure 1 The figure illustrates an example of a system for wireless communication that supports sidelink feedback preemption and uplink multiplexing in wireless communication according to aspects of this disclosure.

[0029] Figure 2 The figure illustrates a portion of a wireless communication system that supports sidelink feedback preemption and uplink multiplexing in wireless communication according to aspects of this disclosure.

[0030] Figure 3 The figure illustrates an example of a processing flow supporting sidelink feedback preemption and uplink multiplexing in wireless communication according to aspects of this disclosure.

[0031] Figure 4 The figure illustrates an example of a processing flow supporting sidelink feedback preemption and uplink multiplexing in wireless communication according to aspects of this disclosure.

[0032] Figure 5 and Figure 6 A block diagram of an apparatus supporting sidelink feedback preemption and uplink multiplexing in wireless communication is shown, according to aspects of this disclosure.

[0033] Figure 7 A block diagram of a communication manager supporting sidelink feedback preemption and uplink multiplexing in wireless communication, according to aspects of this disclosure, is shown.

[0034] Figure 8 A diagram illustrating a system including devices supporting sidelink feedback preemption and uplink multiplexing in wireless communication, according to aspects of this disclosure.

[0035] Figure 9 and Figure 10 A block diagram of an apparatus supporting sidelink feedback preemption and uplink multiplexing in wireless communication is shown, according to aspects of this disclosure.

[0036] Figure 11 A block diagram of a communication manager supporting sidelink feedback preemption and uplink multiplexing in wireless communication, according to aspects of this disclosure, is shown.

[0037] Figure 12 A diagram illustrating a system including devices supporting sidelink feedback preemption and uplink multiplexing in wireless communication, according to aspects of this disclosure.

[0038] Figures 13 to 19 The diagram illustrates a method for supporting sidelink feedback preemption and uplink multiplexing in wireless communication, according to aspects of this disclosure. Detailed Implementation

[0039] Some wireless communication systems can support both access links and sidelinks. An access link is the communication link between a user equipment (UE) and a base station. In some examples, an access link may be referred to as a Uu interface. Specifically, a Uu interface can refer to the air interface used for downlink transmission, uplink transmission, or both. A sidelink is a communication link between similar devices and, in some cases, may be referred to as a PC5 interface. For example, a sidelink can support communication between multiple UEs (e.g., in vehicle-to-everything (V2X) systems, vehicle-to-vehicle (V2V) systems, device-to-device (D2D) systems, etc.), between multiple base stations (e.g., in integrated access and backhaul (IAB) deployments), or between other types of wireless communication devices. Note that while the various examples provided herein are discussed with respect to UE sidelink devices, such sidelink technologies can be used with any type of wireless device that uses sidelink communication. For example, a sidelink can support one or more of the following: D2D communication, V2X or V2V communication, message relay, discovery signaling, beacon signaling, or other signals transmitted over the air from one wireless device to one or more other similar wireless devices.

[0040] In some cases, a base station can configure a set of resources for sidelink communication between UEs. For example, the base station can configure periodic resources that can be used for Physical Sidelink Shared Channel (PSSCH), Physical Sidelink Control Channel (PSCCH), and Physical Sidelink Feedback Channel (PSFCH) communication between UEs. For instance, PSFCH resources can be used by the receiving UE to indicate acknowledgment (ACK) or negative acknowledgment (NACK) feedback for PSSCH communication from the sending UE. In some cases, the base station can determine partial preemption of one or more sidelink communications for sidelink resources. For example, high-priority communication from another UE using an access link can be scheduled by the base station preempting one or more sidelink communications. Such preemption indications can be provided by the base station to the sidelink UE in a Sidelink Preemption Indication (SPI).

[0041] Based on the various aspects discussed herein, techniques are provided for preempting sidelink feedback and uplink multiplexing in the presence of an SPI indicating one or more sidelink resources. In some cases, the sidelink UE can identify a set of sidelink feedback resources used to provide feedback indications associated with sidelink communication (e.g., hybrid Automatic Repeat Request (HARQ) ACK / NACK feedback), and based on the SPI, it can be determined whether to send sidelink feedback. In some cases, the UE can cancel the transmission of one or more sidelink data using resources indicated by the SPI (e.g., PSSCH transmission), but can still send sidelink feedback (e.g., PSFCH transmission). In other cases, the UE can preempt the transmission of sidelink feedback. In some cases, the determination of whether to send or preempt sidelink feedback can be based at least in part on one or more of the following: the priority of the sidelink communication associated with the sidelink feedback, the priority indicated in the SPI, whether the sidelink communication is unicast or multicast, a Reference Signal Received Power (RSRP) measurement, the partition identifier of the SPI, the resource pool ID indicated by the SPI, or any combination thereof.

[0042] In some cases, a UE transmitting sidelink communication (e.g., PSSCH transmission) can receive feedback from a receiving sidelink UE and can report the feedback to the serving base station in a feedback report, such as one provided to the serving base station using uplink control information (UCI) (e.g., for the allocation of sidelink resources). In some cases, if the SPI is associated with sidelink communication, sidelink feedback, or both, the indication of sidelink feedback in the feedback report can be omitted. In other cases, if the SPI is associated with sidelink communication, sidelink feedback, or both; or based on the absence of sidelink feedback from the receiving UE, the transmitting sidelink UE can report a NACK for the sidelink feedback in the feedback report. Such a NACK indication can be provided in the feedback report within a transmission of uplink control information (UCI) of a uniform size expected at the base station.

[0043] The various aspects of the subject matter described herein can be implemented to achieve one or more of the following potential advantages. The technologies employed by the described base station and UE can provide benefits and enhancements to the operation of wireless communication systems. For example, in communications with sidelink UEs and with other UEs that can send or receive high-priority or low-latency communications, the operations performed by the UE can provide improvements in reliability and efficiency. Such improvements can enhance the efficiency of wireless communication at the UE by allowing flexible allocation of sidelink resources using configurable preemption in cases where other communications may conflict with sidelink resources. The described technologies can therefore include features for improving reliability in communications, enhancing communication efficiency for sidelink and access link UEs, and other benefits.

[0044] The aspects of this disclosure are initially described in the context of wireless communication systems. These aspects are further illustrated and described by way of and reference to processing flows, apparatus diagrams, system diagrams, and flowcharts relating to sidelink feedback preemption and uplink multiplexing in wireless communication.

[0045] Figure 1 The figure illustrates an example of a wireless communication system 100 supporting sidelink feedback preemption and uplink multiplexing in wireless communication according to aspects of this disclosure. The wireless communication system 100 may include one or more base stations 105, one or more UEs 115, and a core network 130. In some examples, the wireless communication system 100 may be a Long Term Evolution (LTE) network, an LTE-Advanced (LTE-A) network, an LTE-APro network, or a New Radio (NR) network. In some examples, the wireless communication system 100 may support enhanced broadband communication, ultra-reliable (e.g., mission-critical) communication, low-latency communication, communication with low-cost and low-complexity devices, or any combination thereof.

[0046] Base stations 105 can be distributed throughout a geographical area to form a wireless communication system 100, and can be devices of different forms or with different capabilities. Base stations 105 and UE 115 can communicate wirelessly via one or more communication links 125. Each base station 105 can provide a coverage area 110, and UE 115 and base station 105 can establish one or more communication links 125 on the coverage area 110. The coverage area 110 can be an example of a geographical area where base stations 105 and UE 115 can support signal communication according to one or more radio access technologies.

[0047] UE 115 can be distributed throughout the entire coverage area 110 of the wireless communication system 100, and each UE 115 can be stationary, mobile, or both at different times. UE 115 can be devices of different forms or with different capabilities. Some example UE 115s are shown in... Figure 1 It is shown in the middle. For example... Figure 1 As shown, the UE 115 described herein can communicate with various types of devices, such as other UE 115s, base station 105, or network equipment (e.g., core network nodes, relay equipment, integrated access and backhaul (IAB) nodes, or other network equipment).

[0048] Base station 105 may communicate with core network 130, or with each other, or with both. For example, base station 105 may be connected to core network 130 via one or more backhaul links 120 (e.g., via S1, N2, N3, or other interfaces). Base station 105 may communicate with each other directly (e.g., directly between base stations 105) or indirectly (e.g., via core network 130) via backhaul links 120 (e.g., via X2, Xn, or other interfaces), or both. In some examples, backhaul link 120 may be one or more radio links or include one or more radio links.

[0049] One or more of the base stations 105 described herein may include, or may be referred to by those skilled in the art as, base transceiver station, radio base station, access point, radio transceiver, Node (node) B, eNodeB (eNB), next-generation NodeB or gigabit-NodeB (any of which may be referred to as gNB), home NodeB, home eNodeB or other suitable terms.

[0050] UE 115 may include or be referred to as a mobile device, wireless device, remote device, handheld device, or subscriber device, or some other suitable term, wherein "device" may also be referred to as a unit, station, terminal, or client, etc. UE 115 may also include or be referred to as a personal electronic device, such as a cellular phone, personal digital assistant (PDA), tablet computer, laptop computer, or personal computer. In some examples, UE 115 may include or be referred to as a wireless local loop (WLL) station, Internet of Things (IoT) device, Internet of Everything (IoE) device, or machine-type communication (MTC) device, etc., which can be implemented in various objects (such as appliances, vehicles, instruments, etc.).

[0051] like Figure 1 As shown, the UE 115 described herein can communicate with various types of devices, such as other UE 115s that can sometimes act as relays, as well as base station 105 and network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, etc.

[0052] UE 115 and base station 105 can wirelessly communicate with each other on one or more carriers via one or more communication links 125. The term "carrier" can refer to a set of radio spectrum resources having a defined physical layer structure for supporting communication link 125. For example, a carrier for communication link 125 may include a portion (e.g., a bandwidth portion (BWP)) of a radio spectrum band operating according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-APro, NR). Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information), coordination control signaling for carrier, user data, or other signaling operations. Wireless communication system 100 can support communication with UE 115 using carrier aggregation or multi-carrier operation. Depending on the carrier aggregation configuration, UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers. Carrier aggregation can be used with frequency division duplex (FDD) and time division duplex (TDD) component carriers.

[0053] In some examples (e.g., in a carrier aggregation configuration), a carrier may also have acquisition or control signaling that coordinates the operation of other carriers. A carrier may be associated with a frequency channel (e.g., an absolute RF channel number (EARFCN) for Evolved Universal Mobile Telecommunication System Terrestrial Radio Access (E-UTRA)) and may be located by the UE 115 based on a channel raster. A carrier may operate in standalone mode, where initial acquisition and connection can be performed by the UE 115 via that carrier, or the carrier may operate in non-standalone mode, where different carriers (e.g., carriers of the same or different radio access technologies) are used to anchor the connection.

[0054] The communication link 125 shown in the wireless communication system 100 may include uplink transmission from UE 115 to base station 105, or downlink transmission from base station 105 to UE 115. The carrier may carry downlink or uplink communication (e.g., in FDD mode), or may be configured to carry both downlink and uplink communication (e.g., in TDD mode).

[0055] A carrier can be associated with a specific bandwidth of the radio frequency spectrum, and in some examples, the carrier bandwidth can be referred to as the carrier or the “system bandwidth” of the wireless communication system 100. For example, the carrier bandwidth can be one of several defined bandwidths of a carrier used for a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 MHz). Devices of the wireless communication system 100 (e.g., base station 105 or UE 115, or both) can have a hardware configuration that supports communication on a specific carrier bandwidth, or can be configured to support communication on one of a set of carrier bandwidths. In some examples, the wireless communication system 100 may include a base station 105 or UE 115 that supports simultaneous communication via carriers associated with multiple carrier bandwidths. In some examples, each served UE 115 can be configured to operate on a portion (e.g., a subband, BWP) or all of the carrier bandwidth.

[0056] The signal waveform transmitted via a carrier can consist of multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques, such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform extended OFDM (DFT-S-OFDM)). In a system employing MCM, a resource element can consist of a symbol period (e.g., the duration of a modulation symbol) and a subcarrier, where the symbol period and subcarrier spacing are negatively correlated. The number of bits carried by each resource element can depend on the modulation scheme (e.g., the order of the modulation scheme, the decoding rate of the modulation scheme, or both). Therefore, the more resource elements the UE 115 receives and the higher the order of the modulation scheme, the higher the data rate that can be used for the UE 115. Wireless communication resources can refer to a combination of radio frequency spectrum resources, temporal resources, and spatial resources (e.g., spatial layers or beams), and the use of multiple spatial layers can further improve the data rate or data integrity used for communication with the UE 115.

[0057] One or more parameter sets for a carrier can be supported, where the parameter sets may include subcarrier spacing (Δf) and cyclic prefix. A carrier can be divided into one or more BWPs with the same or different parameter sets. In some examples, UE 115 can be configured with multiple BWPs. In some examples, a single BWP for a carrier can be active at a given time, and communication for UE 115 can be restricted to one or more active BWPs.

[0058] The time interval used for base station 105 or UE 115 can be expressed as a multiple of a basic time unit, such as T. s =1 / (Δf) max ·N f The sampling period is ) seconds, where Δfmax This can represent the maximum supported subcarrier spacing, while N... f This can represent the maximum supported Discrete Fourier Transform (DFT) size. The time interval of the communication resource can be organized according to radio frames, each with a specified duration (e.g., 10 milliseconds (ms)). Each radio frame can be identified by a System Frame Number (SFN) (e.g., ranging from 0 to 1023).

[0059] Each frame may include multiple consecutively numbered subframes or time slots, and each subframe or time slot may have the same duration. In some examples, a frame may be divided (e.g., in the time domain) into subframes, and each subframe may be further divided into several time slots. Alternatively, each frame may include a variable number of time slots, and the number of time slots may depend on the subcarrier spacing. Each time slot may include several symbol periods (e.g., depending on the length of the cyclic prefix appended to each symbol period). In some wireless communication systems 100, time slots may be further divided into multiple micro-time slots containing one or more symbols. In addition to the cyclic prefix, each symbol period may contain one or more (e.g., N) symbols. f Sampling period. The duration of the symbol period can depend on the subcarrier spacing or the operating frequency band.

[0060] A subframe, time slot, micro-time slot, or symbol can be the smallest scheduling unit of the wireless communication system 100 (e.g., in the time domain) and can be referred to as a transmission time interval (TTI). In some examples, the duration of the TTI (e.g., the number of symbol periods in the TTI) can be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communication system 100 can be dynamically selected (e.g., in a burst of shortened TTIs (sTTIs)).

[0061] Physical channels can be multiplexed on a carrier using various techniques. For example, one or more of Time Division Multiplexing (TDM), Frequency Division Multiplexing (FDM), or hybrid TDM-FDM techniques can be used to multiplex physical control channels and physical data channels on a downlink carrier. The control region (e.g., a control resource set (CORESET)) of a physical control channel can be defined by several symbol periods and can extend across the system bandwidth or a subset of the carrier's system bandwidth. One or more control regions (e.g., CORESETs) can be configured for a set of UEs 115. For example, one or more UEs 115 can monitor or search for control regions to obtain control information based on one or more search space sets, and each search space set can include one or more control channel candidates arranged in a cascaded manner in one or more aggregation levels. An aggregation level for control channel candidates can refer to the number of control channel resources (e.g., control channel elements (CCEs)) associated with coded information in a control information format having a given payload size. Search space sets can include a common search space set configured to issue control information to multiple UEs 115 and a UE-specific search space set for issuing control information to a specific UE 115.

[0062] Each base station 105 may provide communication coverage via one or more cells (e.g., macro cells, small cells, hotspots, or other types of cells, or any combination thereof). The term "cell" may refer to a logical communication entity used to communicate with base station 105 (e.g., via a carrier) and may be associated with an identifier used to distinguish neighboring cells (e.g., Physical Cell Identifier (PCID), Virtual Cell Identifier (VCID), or others). In some examples, a cell may also refer to a geographic coverage area 110 or a portion (e.g., a sector) of geographic coverage area 110 on which a logical communication entity operates. Depending on various factors such as the capabilities of base station 105, the range of such cells can range from small areas (e.g., structures, subsets of structures) to large areas. For example, a cell may be or include buildings, subsets of buildings, or external space between or overlapping geographic coverage areas 110, etc.

[0063] In some examples, base station 105 may be mobile, thereby providing communication coverage to mobile geographic coverage areas 110. In some examples, different geographic coverage areas 110 associated with different technologies may overlap, but different geographic coverage areas 110 may be supported by the same base station 105. In other examples, overlapping geographic coverage areas 110 associated with different technologies may be supported by different base stations 105. Wireless communication system 100 may include, for example, a heterogeneous network, in which different types of base stations 105 use the same or different radio access technologies to provide coverage for various geographic coverage areas 110.

[0064] Some UE 115 devices, such as MTC or IoT devices, can be low-cost or low-complexity devices and can provide automated communication between machines (e.g., via machine-to-machine (M2M) communication). M2M communication or MTC can refer to data communication technologies that allow devices to communicate with each other or with base station 105 without human intervention. In some examples, M2M communication or MTC can include communication from devices that integrate sensors or meters to measure or capture information and relay such information to a central server or application, which uses the information or presents it to humans interacting with the application. Some UE 115 devices can be designed to collect information or enable automated behavior of machines or other devices. Examples of applications for MTC devices include smart metering, inventory monitoring, water level monitoring, equipment monitoring, healthcare monitoring, wildlife monitoring, weather and geological event monitoring, fleet management and tracking, remote security sensing, physical access control, and transaction-based service charging.

[0065] Wireless communication system 100 can be configured to support ultra-reliable communication or low-latency communication, or various combinations thereof. For example, wireless communication system 100 can be configured to support ultra-reliable low-latency communication (URLLC) or mission-critical communication. UE 115 can be designed to support ultra-reliable, low-latency, or critical functions (e.g., mission-critical functions). Ultra-reliable communication can include private or group communication and can be supported by one or more mission-critical services, such as mission-critical push-to-talk (MCPTT), mission-critical video (MCVideo), or mission-critical data (MCData). Support for mission-critical functions can include service prioritization, and mission-critical services can be used for public safety or general business applications. The terms ultra-reliable, low-latency, mission-critical, and ultra-reliable low-latency are used interchangeably herein.

[0066] In some examples, UE 115 may also be able to communicate directly with other UE 115 via device-to-device (D2D) communication link 135 (e.g., using peer-to-peer (P2P) or D2D protocols). One or more UE 115s utilizing D2D communication may be within the geographic coverage area 110 of base station 105. Other UE 115s in such a group may be outside the geographic coverage area 110 of base station 105, or otherwise unable to receive transmissions from base station 105. In some examples, the group of UE 115s communicating via D2D communication may utilize a one-to-many (1:M) system, where each UE 115 transmits to every other UE 115 in the group. In some examples, base station 105 facilitates the scheduling of resources for D2D communication. In other cases, D2D communication between UE 115s is performed without the involvement of base station 105.

[0067] In some systems, the D2D communication link 135 may be an example of a communication channel (such as a sidelink communication channel) between vehicles (e.g., UE 115). In some examples, vehicles may communicate using vehicle-to-everything (V2X) communication, vehicle-to-vehicle (V2V) communication, or some combination thereof. Vehicles may signal information related to traffic conditions, signaling, weather, safety, emergencies, or any other information related to the V2X system. In some examples, vehicles in a V2X system may communicate with roadside infrastructure (such as roadside units), or communicate with the network via vehicle-to-network (V2N) communication through one or more network nodes (e.g., base station 105), or both.

[0068] Core network 130 can provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. Core network 130 can be an evolved packet core (EPC) or a 5G core (5GC), which may include at least one control plane entity (e.g., a mobility management entity (MME), access and mobility management function (AMF)) managing access and mobility, and at least one user plane entity (e.g., a serving gateway (S-GW), packet data network (PDN) gateway (P-GW), or user plane function (UPF)) routing packets or interconnecting to external networks. The control plane entity can manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management for UE 115 served by base station 105 associated with core network 130. User IP packets can be delivered through the user plane entity, which can provide IP address allocation and other functions. The user plane entity can connect to network operator IP service 150. Network operator IP service 150 may include access to the Internet, intranet(s), IP Multimedia Subsystem (IMS), or packet-switched streaming services.

[0069] Some network devices (such as base station 105) may include sub-components, such as access network entity 140, which may be an example of an access node controller (ANC). Each access network entity 140 may communicate with UE 115 through one or more other access network transmitting entities 145, which may be referred to as a radio headend, smart radio headend, or transmit / receive point (TRP). Each access network transmitting entity 145 may include one or more antenna panels. In some configurations, the various functions of each access network entity 140 or base station 105 may be distributed across various network devices (e.g., radio headends and ANCs) or combined into a single network device (e.g., base station 105).

[0070] Wireless communication system 100 can operate using one or more frequency bands typically in the range of 300 MHz to 300 GHz. The region from 300 MHz to 3 GHz is generally referred to as the ultra-high frequency (UHF) region or decimeter band because the wavelength range is from approximately one decimeter to one meter. UHF waves may be blocked or redirected by buildings and environmental features, but these waves can penetrate structures sufficiently to enable macrocells to serve UE 115 located indoors. Compared to transmissions using smaller frequencies and longer waves in the high frequency (HF) or very high frequency (VHF) portions of the spectrum below 300 MHz, UHF wave transmissions can be associated with smaller antennas and shorter distances (e.g., less than 100 km).

[0071] The wireless communication system 100 can also operate in the ultra-high frequency (SHF) region (also known as the centimeter-wave band) using a frequency band from 3 GHz to 30 GHz or in the extremely high frequency (EHF) region (e.g., from 30 GHz to 300 GHz) (also known as the millimeter-wave band) using a spectrum. In some examples, the wireless communication system 100 can support millimeter-wave (mmW) communication between the UE 115 and the base station 105, and the EHF antennas of the corresponding devices can be smaller and more closely spaced than UHF antennas. In some examples, this can facilitate the use of antenna arrays within the device. However, compared to SHF or UHF transmissions, EHF transmissions may suffer greater atmospheric attenuation and shorter distances during propagation. Transmissions can be made across one or more different frequency regions using the techniques disclosed herein, and the designated use of wavebands across these frequency regions may vary by country or regulatory body.

[0072] Wireless communication system 100 can utilize both licensed and unlicensed radio frequency spectrum bands. For example, wireless communication system 100 can employ License Assisted Access (LAA), LTE-Unlicensed (LTE-U) radio access technology, or NR technology in unlicensed bands (such as the 5 GHz Industrial, Scientific, and Medical (ISM) band). When operating in unlicensed radio frequency spectrum bands, devices such as base station 105 and UE 115 can employ carrier sensing for collision detection and avoidance. In some examples, operation in unlicensed bands can be based on carrier aggregation configurations (e.g., LAA) that combine component carriers operating in licensed bands. Among other examples, operation in unlicensed spectrum can include downlink transmission, uplink transmission, P2P transmission, or D2D transmission.

[0073] Base station 105 or UE 115 may be equipped with multiple antennas that can be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communication, or beamforming. The antennas of base station 105 or UE 115 may be located within one or more antenna arrays or antenna panels that can support MIMO operation or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be located together at an antenna accessory (such as an antenna tower). In some examples, the antennas or antenna arrays associated with base station 105 may be located in different geographical locations. Base station 105 may have an antenna array with several rows and columns of antenna ports that base station 105 can use to support beamforming for communication with UE 115. Similarly, UE 115 may have one or more antenna arrays that can support various MIMO or beamforming operations. Additionally or alternatively, antenna panels may support radio frequency beamforming for signals transmitted via antenna ports.

[0074] Base station 105 or UE 115 can use MIMO communication to utilize multipath signal propagation and improve spectral efficiency by sending or receiving multiple signals via different spatial layers. This technique can be referred to as spatial multiplexing. For example, multiple signals can be transmitted by a transmitting device via different antennas or different combinations of antennas. Similarly, multiple signals can be received by a receiving device via different antennas or different combinations of antennas. Each of the multiple signals can be referred to as a separate spatial stream and can carry bits associated with the same data stream (e.g., the same codeword) or different data streams (e.g., different codewords). Different spatial layers can be associated with different antenna ports used for channel measurement and reporting. MIMO techniques include single-user MIMO (SU-MIMO) in which multiple spatial layers are sent to the same receiving device, and multi-user MIMO (MU-MIMO) in which multiple spatial layers are sent to multiple devices.

[0075] Beamforming (also known as spatial filtering, directional transmission, or directional reception) is a signal processing technique that can be used at a transmitting or receiving device (e.g., base station 105, UE 115) to shape or guide an antenna beam (e.g., transmit beam, receive beam) along a spatial path between the transmitting and receiving devices. Beamforming can be achieved by combining signals communicating via antenna elements of an antenna array such that some signals propagating with respect to a specific orientation of the antenna array experience constructive interference while others experience destructive interference. Adjustments to the signals communicating via the antenna elements can include the transmitting or receiving device applying amplitude shifts, phase shifts, or both to the signals carried via the antenna elements associated with the device. The adjustments associated with each of the antenna elements can be defined by a beamforming weight set associated with a specific orientation (e.g., the antenna array relative to the transmitting or receiving device, or relative to some other orientation).

[0076] Base station 105 or UE 115 may use beam scanning technology as part of beamforming operations. For example, base station 105 may use multiple antennas or antenna arrays (e.g., antenna panels) to perform beamforming operations for directional communication with UE 115. Some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be transmitted multiple times by base station 105 in different directions. For example, base station 105 may transmit signals according to different beamforming weight sets associated with different transmission directions. Transmissions in different beam directions may be used to identify (e.g., by transmitting devices, such as base station 105, or receiving devices, such as UE 115) the beam directions for subsequent transmissions or receptions by base station 105.

[0077] Some signals, such as data signals associated with a specific receiving device, may be transmitted by base station 105 in a single beam direction (e.g., the direction associated with the receiving device, such as UE 115). In some examples, the beam direction associated with transmission along a single beam direction may be determined based on signals transmitted in one or more beam directions. For example, UE 115 may receive one or more signals transmitted by base station 105 in different directions and may report to base station 105 an indication that UE 115 received a signal with the highest signal quality or with other acceptable signal quality.

[0078] In some examples, multiple beam directions can be used to perform transmission by a device (e.g., by base station 105 or UE 115), and the device can use a combination of digital precoding or radio frequency beamforming to generate a combined beam for transmission (e.g., from base station 105 to UE 115). UE 115 can report feedback indicating precoding weights for one or more beam directions, and this feedback can correspond to the number of beams configured across the system bandwidth or one or more subbands. Base station 105 can transmit reference signals (e.g., cell-specific reference signals (CRS), channel state information reference signals (CSI-RS)), which can be precoded or unprecoded. UE 115 can provide feedback for beam selection, which can be a precoding matrix indicator (PMI) or codebook-based feedback (e.g., multi-panel type codebook, linear combination type codebook, port selection type codebook). Although these techniques are described with reference to signals transmitted by base station 105 in one or more directions, UE 115 may employ similar techniques to transmit signals multiple times in different directions (e.g., to identify beam directions for subsequent transmission or reception by UE 115), or to transmit signals in a single direction (e.g., to transmit data to a receiving device).

[0079] A receiving device (e.g., UE 115) may attempt multiple receiving configurations (e.g., directional listening) when receiving various signals (such as synchronization signals, reference signals, beam selection signals, or other control signals) from base station 105. For example, the receiving device may attempt multiple receiving directions by: receiving via different antenna subarrays; processing the received signal according to different antenna subarrays; receiving according to different sets of receiving beamforming weights applied to signals received at multiple antenna elements of the antenna array (e.g., different directional listening weight sets); or processing the received signal according to different sets of receiving beamforming weights applied to signals received at multiple antenna elements of the antenna array, any of which can be referred to as “listening” according to different receiving configurations or receiving directions. In some examples, the receiving device may use a single receiving configuration to receive along a single beam direction (e.g., when receiving data signals). The single receiving configuration may be aligned to a beam direction determined based on listening according to different receiving configuration directions (e.g., a beam direction determined to have the highest signal strength, highest signal-to-noise ratio (SNR), or other acceptable signal quality based on listening according to multiple beam directions).

[0080] Wireless communication system 100 can be a packet-based network operating according to a layered protocol stack. In the user plane, communication at the bearer or Packet Data Convergence Protocol (PDCP) layer can be IP-based. The Radio Link Control (RLC) layer can perform packet segmentation and reassembly for communication over logical channels. The Medium Access Control (MAC) layer can perform priority processing and multiplexing of logical channels to transport channels. The MAC layer can also use error detection techniques, error correction techniques, or both to support retransmission at the MAC layer to improve link efficiency. In the control plane, the Radio Resource Control (RRC) protocol layer can provide support for the establishment, configuration, and maintenance of RRC connections between UE 115 and base station 105 or core network 130 for radio bearers supporting user plane data. At the physical layer, transport channels can be mapped to physical channels.

[0081] UE 115 and base station 105 can support data retransmission to increase the likelihood of successful data reception. Hybrid Automatic Repeat Request (HARQ) feedback is a technique used to increase the likelihood of data being correctly received through communication link 125. HARQ can include a combination of error detection (e.g., using Cyclic Redundancy Check (CRC)), forward error correction (FEC), and retransmission (e.g., Automatic Repeat Request (ARQ)). HARQ can improve MAC layer throughput under poor radio conditions (e.g., low signal-to-noise ratio conditions). In some examples, the device can support simultaneous time-slot HARQ feedback, where the device can provide HARQ feedback in a specific time slot for data received in a previous symbol within that time slot. In other cases, the device can provide HARQ feedback in subsequent time slots or according to some other time interval.

[0082] In some cases, multiple UEs 115 can implement sidelink communication for direct UE-to-UE information exchange. According to the various techniques described, such UEs 115 can monitor the SPI from base station 105 and determine, based on the SPI, whether one or more sidelink communications are preempted. In some cases, UEs 115 can be configured (e.g., by base station 105) to have a periodic set of resources for transmitting sidelink communications, which may include sidelink communications via PSSCH, PSCCH, PSFCH, or any combination thereof. In some cases, a first UE 115 can receive sidelink communications (e.g., PSSCH communications) from a second UE 115 and determine HARQ ACK / NACK feedback for the sidelink communications. According to the various techniques discussed herein, the first UE 115 can identify a sidelink feedback resource for providing feedback indications (e.g., HARQ ACK / NACK feedback) associated with the sidelink communications, and determine whether to send sidelink feedback based on the indication in the received SPI. In some cases, the sidelink feedback may be PSFCH feedback to the second UE. In other cases, the first UE 115 may send PSSCH communication to the second UE 115, and sidelink feedback may be reported to the serving base station 105 in a feedback report provided to the serving base station 105 using UCI (e.g., for the allocation of sidelink resources). In some cases, the indication of sidelink feedback in the feedback report may be sent or preempted according to various techniques as discussed herein.

[0083] Figure 2The figure illustrates an example of a wireless communication system 200 supporting sidelink feedback preemption and uplink multiplexing in wireless communication according to aspects of this disclosure. In some examples, wireless communication system 200 may implement aspects of wireless communication system 100. Wireless communication system 200 may include base station 105-a, first UE 115-a, second UE 115-b, and third UE 115-c, which may be respectively referenced to... Figure 1 Examples of base station 105 and UE 115 are described. In some cases, the first UE 115-a and the second UE 115-b can communicate with each other via sidelink communication (e.g., within a V2X system, within a D2D system, etc.).

[0084] In this example, each of the UEs 115 may be located in the coverage area 110-a of the base station 105 (e.g., reference). Figure 1 The coverage area 110 is within the coverage area 110. In other examples, one or more UEs 115 may be outside the coverage area 110-a. A first UE 115-a, a second UE 115-b, or both may communicate with base station 105-a via a corresponding access link 210, and a third UE 115-c may communicate with base station 105-a via access link 205. Access links 205 and 210 may be examples of Uu links, which can be used to provide downlink and uplink communication (e.g., via a Uu interface) between UE 115 and base station 105-a. Figure 2 In the example, a first access link 210-a can be established with the first UE 115-a, and a second access link 210-b can be established with the second UE 115-b. Furthermore, UE 115 can establish a side link 215 (e.g., a PC5 link), which can be used for direct communication between the first UE 115-a and the second UE 115-b. Note that... Figure 2 The examples provided are for discussion and illustration purposes only, and many other deployments are possible. A few examples are given, such as situations where communication between base station 105-a and one or more UEs 115 is relayed via another UE 115 (e.g., using a side link 215 for relaying when UE 115 is outside coverage area 110-a), situations where additional UEs 115 are present, situations where other types of UEs 115 or relays are present (e.g., roadside units in a V2X system), situations where UEs 115 are deployed in factory automation or other industrial environments, or any combination thereof. The techniques discussed herein can be used in any such deployment.

[0085] According to the techniques discussed herein, base station 105-a can provide configuration information 220 related to sidelink communication to first UE 115-a and second UE 115-b. Such configuration information may include, for example, indications of radio resources (e.g., PSSCH resources) allocated for sidelink communication 225 between first UE 115-a and second UE 115-b, and resources allocated for sidelink feedback 230 (e.g., PSFCH resources for sidelink HARQ feedback). For example, first UE 115-a may transmit first sidelink communication 225-a and first sidelink feedback 230-a to second UE 115-b in a first sidelink carrier 215-a (e.g., for previous sidelink communication). The second UE 115-b can receive the first sidelink communication 225-a and determine the second sidelink feedback 230-b, which can be transmitted back to the first UE 115-a in the second sidelink carrier 215-b (e.g., along with the second sidelink communication 225-b). In some cases, access link 210 and sidelink 215 can use the same carrier in a licensed band of the radio frequency spectrum. In other cases, one or more of access link 210 or sidelink 215 can use unlicensed or shared radio frequency spectrum, can use different carriers, or a combination thereof.

[0086] In some cases, configuration information 220 can configure the first UE 115-a and the second UE 115-b to operate in mode 1 resource allocation, where the network allocates resources for each UE 115 (e.g., in dynamic scheduling using DCI format 3_0, or utilizing a configured resource pool), or in mode 2 resource allocation, where the UE 115 uses sensing and reservation techniques to select sidelink resources from the sidelink resource pool to identify resources without direct control of base station 105-a. In some cases, sidelink resources can be allocated among additional resources available for uplink communication on access links 205 and 210 (e.g., in uplink symbols of the Uu interface). In other cases, sidelink resources can also be allocated among flexible resources, downlink resources, or both of access links 205 and 210 (e.g., in flexible or downlink symbols of the Uu interface). In some cases, on a given carrier, base station 105-a can allocate some resources for sidelinks via resource pool configuration and simultaneously support some Uu users on the carrier.

[0087] In some cases, the third UE 115-c may have an established access link 205, and the base station 105-a may determine that high-priority access link communication 240 will have resources allocated for the third UE 115-c (e.g., for URLLC or mission-critical data). In some cases, the base station 105-a may allocate resources for high-priority access link communication 240 that conflict with one or more sidelink resources already allocated for sidelink communication 225, sidelink feedback 230, or both. To avoid interference between sidelink 215 and services on access link 205, the base station 105-a may send an SPI 235 to the first UE 115-a and the second UE 115-b. In some cases, the SPI 235 may be sent in downlink control information (DCI) on the PDCCH, and may alternatively or additionally be sent in a broadcast transmission from the base station 105-a (e.g., on the physical broadcast channel (PBCH)). SPI235 can be received at the first UE 115-a, the second UE 115-b, or both. Subsequently, the first UE 115-a, the second UE 115-b, or both can preempt one or more sidelinks to reduce interference with high-priority access link communication 240. This preemption technique provides flexibility to base station 105-a in scheduling sidelink resources and allocating access link resources for certain communications, such as high-priority communications. By providing sufficient sidelink resources, the first UE 115-a, the second UE 115-b, and any other sidelink UEs can exchange data efficiently with relatively high reliability and low latency, relative to situations where base station 105-a may be limited by the amount of available sidelink resources. Furthermore, for high-priority access link communication 240, reliability can be increased and latency can be reduced by the ability of base station 105-a to schedule such communication using resources that may conflict with allocated sidelink resources.

[0088] In some cases, base station 105-a may have the capability to multiplex services for users with different service priorities (e.g., enhanced mobile broadband (eMBB) users with lower service priority and URLLC users with higher service priority, which may be identified based on network slice ID or network slice selection assist information (NSSAI) in some cases). When multiplexing different services on access links 205 and 210, in some cases, base station 105-a may send an uplink cancellation indication (CI) for users with lower priority levels (e.g., for UE 115 with resource allocation that is configured with a network slice ID with a lower priority level compared to one or more other network slice IDs), which can cancel the lower priority communication. In other cases, multiplexing different services on access links 205 and 210 can be provided by power boosting UE 115 with higher priority levels, which can increase the likelihood of successfully receiving communication even when another UE 115 is simultaneously uplinking. Therefore, both schemes allow dynamic resource sharing across users with different transmission priorities, and base station 105-a can control how resources should be shared. Furthermore, in some cases, uplink CI may not be applicable to uplink control information (UCI) that may include HARQ feedback sent by UE 115 to base station 105-a, because PUCCH resources for such UCIs can be allocated at the edge of the carrier, while higher-priority communications can be allocated to non-overlapping resources far from the carrier edge. However, PSFCH resources may not be allocated in this manner, so sidelink HARQ feedback can be sent in overlapping resources that can communicate with higher priorities. This may occur because the resources used for PSFCH depend on the sub-channel used for the associated PSSCH transmission, the time slot in which the PSSCH is transmitted, the user's source ID and group ID (for multicast sidelinks), or any combination thereof.

[0089] Accordingly, SPI 235 can be associated with PSFCH resources that can be used to send sidelink feedback 230 (e.g., sidelink HARQ ACK / NACK feedback). In some cases, upon receiving SPI 235 indicating PSFCH resources, UE 115, which will send sidelink feedback 230, can determine whether to preempt the sidelink feedback 230. In some cases, the determination of whether to send sidelink feedback 230 can be based on one or more parameters of the sidelink communication 230, one or more parameters indicated by SPI 235, or any combination thereof. In some cases, SPI235 may indicate one or more of the following: time / frequency indication of the sidelink resource to be preempted, priority for preemption, partition identifier (e.g., indicating one or more beams, synchronization signal block (SSB) ID, one or more regions, or a combination thereof) associated with preemption, reference signal received power (RSRP) threshold for preemption (e.g., if UE 115 has an RSRP at or below the RSRP threshold for a reference signal from base station 105-a, then UE 115 can use the sidelink resource for transmission), periodicity of preemption (e.g., periodic resources can be preempted), resource pool ID of the sidelink resource, or any combination thereof.

[0090] In some cases, where SPI 235 indicates a resource to be used for sidelink feedback 230 (e.g., a PSFCH resource for HARQACK / NACK feedback), the first UE 115-a or the second UE 115-b can determine whether to preempt or transmit the associated transmission. In some cases, SPI 235 may not be applicable to sidelink transmissions on the PSFCH; therefore, in such cases, the first UE 115-a or the second UE 115-b can transmit sidelink feedback 230 regardless of SPI 235 (e.g., SPI 235 may be applied to the PSSCH but not to the PSFCH). In other cases, SPI 235 can be applied to PSFCH communication regardless of any other factors (e.g., if SPI 235 indicates a PSFCH resource, PSFCH communication is canceled regardless of associated priority or other factors). In further cases, such as those discussed in more detail herein, SPI 235 may be applied to PSFCH transmission depending on one or more other factors. In some cases, the sidelink UE 115 can be configured per UE, per resource pool, per carrier, or a combination thereof to perform PSFCH preemption based on one or more techniques as discussed herein (e.g., the first UE 115-a can be configured to preempt PSFCH based on SPI, and the second UE 115-b can be configured to send PSFCH regardless of SPI, or the first carrier can be configured to preempt PSFCH based on SPI, and the second carrier can be configured to send PSFCH based on one or more factors, etc.).

[0091] Where SPI 235 is applied to PSFCH communication based on one or more factors, sidelink feedback 230 can be preempted based on one or more of the following: the priority of the communication associated with sidelink feedback 230, whether the sidelink communication 225 associated with the priority indicated by SPI 235 is multicast or unicast (e.g., the broadcast type of the communication), RSRP measurement from base station 105-a and associated RSRP threshold (e.g., provided in configuration information 220), partition ID indicated by SPI 235, resource pool ID indicated by SPI 235, or any combination thereof. For example, if partition ID and resource pool ID are used, if the first sidelink feedback 230-a is associated with the same partition ID as indicated by SPI 235 and the same resource pool ID as indicated by SPI 235, then the first UE 115-a can preempt the first sidelink feedback 230-a. In such an example, if the first sidelink feedback 230-a is associated with a different partition ID or resource pool ID, then the first UE 115-a can send PSFCH communication. In another example, if the priority and RSRP threshold are indicated by SPI 235, and the first UE 115-a has a first sidelink feedback 230-a to send, then the first UE 115-a can determine the RSRP threshold. In some cases, the RSRP threshold may depend on the priority of the sidelink communication 225 associated with the first sidelink feedback 225-a and the priority indicated in the SPI (e.g., the UE determines the RSRP threshold for (x, y), where x is the priority of the sidelink packet sent on the PSSCH associated with the PSFCH, and y is the priority indicated by SPI 235). The first UE 115-a can compare the measured RSRP (e.g., that of a reference signal received from base station 105-a) against the RSRP threshold and determine whether the first sidelink feedback 230-a should be preempted. In other examples, preemption determination may be based on any one or a combination of the factors provided in SPI 235.

[0092] In some cases, alternatively or additionally, a sidelink UE 115 (such as a first UE 115-a) may use access link feedback resource 245 to send a sidelink feedback report to serving base station 105-a. For example, the first UE 115-a may be operating under sidelink unicast and mode 1 resource allocation, where sidelink HARQ feedback can be reported to base station 105-a (e.g., for future sidelink resource allocation). In some cases, access link feedback resource 245 may not be affected by uplink CI (e.g., because high-priority access link communication 240 does not overlap with access link feedback resource 245). However, SPI 235 may cause the cancellation of one or more sidelink communications 225 on the PSSCH. For example, SPI 235 may prevent the first UE 115-a from sending a first sidelink communication 225-a to the second UE 115-b, and as a result, the second UE 115-d may not provide a corresponding feedback indication in the second sidelink feedback 230-b. In other cases, SPI 235 may prevent the second UE 115-b from sending second sidelink feedback 230-b associated with the first sidelink communication 225-a. In some cases, the first UE 115-a may not use access link feedback resource 245 to report sidelink feedback (e.g., sidelink HARQ ACK / NACK feedback) to base station 105-a, although the first UE 115-a may use such resources to report other HARQ feedback or other uplink control information (UCI) to base station 105-a. In other cases, the first UE 115-a may report NACK to base station 105-a in the feedback report. For example, if the first UE 115-a knows that the PSFCH is preempted or in cases where it has not received the PSFCH (e.g., if the PSFCH resource is preempted, but the first UE 115-a may not know this due to not decoding SPI 235), the first UE 115-a may report NACK in the UCI on the PUCCH. By providing a NACK indication in such cases, the size of the UCI provided by the first UE 115-a can be consistent and can be decoded more reliably at the base station 105-a.

[0093] Figure 3The figure illustrates an example of a processing flow 300 supporting sidelink feedback preemption and uplink multiplexing in wireless communication according to aspects of this disclosure. In some examples, processing flow 300 may implement aspects of wireless communication system 100 or 200. Processing flow 300 may be implemented by a first UE 115-d, a second UE 115-e, and a serving base station 105-b, which may be examples of UE 115 and base station 105 as described herein. Alternative examples of the following may be implemented, with some steps performed in a different order than described or not performed at all. In some cases, steps may include additional functionality not mentioned below, or further steps may be added.

[0094] At point 305, the first UE 115-d, the second UE 115-e, and the base station 105-b can establish and configure a sidelink communication connection between the first UE 115-d and the second UE 115-e. In some cases, as part of the sidelink connection establishment, the sidelink communication can be configured by the base station 105-b, and the configuration may include the configuration of UE SPI preemption for sidelink communication. In some cases, the configuration information may be provided in the RRC signaling at part of the connection establishment process. In some cases, the configuration information may provide information related to: SPI priority for PSFCH and PSSCH communication, RSRP threshold associated with SPI or different priority communication, UE behavior based on the broadcast type indicated in the SPI, partition ID, resource pool ID, or any combination thereof. In some cases, the configuration information may also indicate a set of sidelink resources, which may include PSSCH and PSFCH resources that appear periodically as indicated.

[0095] At 310, the first UE 115-d may identify sidelink communication and feedback resources. In some cases, sidelink communication and feedback resources may be provided using configuration information. In other cases, sidelink communication and feedback resources may be provided in the authorization of sidelink resources, in the indication of sidelink resource pools, in the indication of resource pool IDs (e.g., which identify one of several resource pools provided using configuration information), or in any combination thereof. At 315, the second UE 115-e may identify sidelink communication and feedback resources in a similar manner.

[0096] At 320, the second UE 115-e may send sidelink communication (e.g., PSSCH) to the first UE 115-d. In some cases, the sidelink communication may have first priority. The first UE 115-d may receive the sidelink communication and determine whether the communication was successfully received and decoded, and determine the HARQACK / NACK feedback associated with the communication.

[0097] At point 325, the first UE115-d and the second UE115-e can receive the SPI from base station 105-b. In some cases, the SPI may be received during a PDCCH transmission from base station 105-b. In other cases, the SPI may be received during a broadcast transmission (e.g., a PBCH transmission) from base station 105-b.

[0098] At 330, the first UE 115-d can determine that the sidelink resource used to report feedback associated with sidelink communication corresponds to the resource indicated in the SPI. According to the techniques discussed herein, the first UE 115-d can determine, based on the SPI, whether to send or preempt the transmission of sidelink feedback. In some cases, at 335, the first UE 115-d can determine to preempt the transmission of sidelink feedback based on the SPI and configuration information. Such preemption can be determined according to the techniques discussed herein (e.g., based on the priority of sidelink communication, the priority indicated in the SPI, RSRP threshold, broadcast type, partition ID, resource pool ID, or any combination thereof). In other cases, at 340, the first UE 115-d can determine to send sidelink feedback based on the SPI and configuration information, and at 345, the sidelink feedback can be sent (e.g., in PSFCH transmission). In some cases, such determination to send sidelink feedback can be made according to the techniques discussed herein.

[0099] Figure 4 The figure illustrates an example of a processing flow 400 supporting sidelink feedback preemption and uplink multiplexing in wireless communication according to aspects of this disclosure. In some examples, processing flow 400 may implement aspects of wireless communication system 100 or 200. Processing flow 400 may be implemented by a first UE 115-f, a second UE 115-g, and a serving base station 105-c, which may be examples of UE 115 and base station 105 as described herein. Alternative examples of the following may be implemented, with some steps performed in a different order than described or not performed at all. In some cases, steps may include additional functionality not mentioned below, or further steps may be added.

[0100] At point 405, the first UE 115-f, the second UE 115-g, and the base station 105-c can establish and configure a sidelink communication connection between the first UE 115-f and the second UE 115-g. In some cases, as part of the sidelink connection establishment, the sidelink communication can be configured by the base station 105-c, and the configuration may include the configuration of SPI preemption for the sidelink communication. In some cases, the configuration information may be provided in the RRC signaling at part of the connection establishment process. In some cases, the configuration information may provide information related to: the SPI priority for the sidelink communication (e.g., PSFCH, PSSCH, PSCCH, or any combination thereof), the RSRP threshold associated with the SPI or different priority communication, UE behavior based on the broadcast type indicated in the SPI, partition ID, resource pool ID, or any combination thereof. In some cases, the configuration information may also indicate a set of sidelink resources, which may include PSSCH, PSCCH, or PSFCH resources that appear periodically as indicated, or a combination thereof.

[0101] At 410, the first UE 115-f may identify sidelink communication and feedback resources. In some cases, sidelink communication and feedback resources may be provided using configuration information. In other cases, sidelink communication and feedback resources may be provided in the authorization of sidelink resources, in the indication of sidelink resource pools, in the indication of resource pool IDs (e.g., which identify one of several resource pools provided using configuration information), or in any combination thereof. At 415, the second UE 115-g may identify sidelink communication and feedback resources in a similar manner.

[0102] At 420, the first UE 115-f and the second UE 115-g can receive the SPI from the base station 105-c. In some cases, the SPI may be received during a PDCCH transmission from the base station 105-c. In other cases, the SPI may be received during a broadcast transmission (e.g., a PBCH transmission) from the base station 105-c.

[0103] At 425, without SPI preemption of such transmissions, the first UE 115-f may send sidelink communication (e.g., PSSCH or PSCCH) to the second UE 115-g. In some cases, the sidelink communication may have first priority. When sidelink communication is sent, the second UE 115-g may receive the sidelink communication, determine whether the communication was successfully received and decoded, and determine the HARQ ACK / NACK feedback associated with the communication.

[0104] At 430, without SPI preemption of such transmissions, the second UE 115-g may send sidelink feedback to the first UE 115-f. For example, the second UE 115-g may determine whether to send sidelink feedback based on techniques discussed herein (e.g., based on the priority of sidelink communication, the priority indicated in the SPI, the RSRP threshold, the broadcast type, the partition ID, the resource pool ID, or any combination thereof). In some cases, one or both of the sidelink communication and the associated feedback transmission may be preempted.

[0105] At 435, the first UE 115-f can determine whether the sidelink resources (e.g., PSSCH, PSCCH, PSFCH resources, or combinations thereof) associated with the sidelink communication or feedback (or both) correspond to the resources associated with the SPI. Optionally, at 440, in the event that one or more sidelink communications are preempted, the first UE 115-f can determine to preempt the sidelink feedback transmission to base station 105-c based on SPI and configuration information (e.g., in PUCCH transmission). In some cases, the PUCCH transmission to base station 105-c may only include sidelink feedback information associated with the preempted sidelink communication; in such cases, the PUCCH transmission can be completely preempted. In other cases, the first UE 115-f may send other information to the base station 105-c in the UCI (e.g., HARQ ACK / NACK feedback associated with PDSCH or PDCCH communication, HARQ ACK / NACK feedback associated with unpreempted sidelink communication, one or more measurement or status reports, etc.), and sidelink feedback preemption may cause sidelink feedback information associated with preempted sidelink communication to be dropped from the UCI.

[0106] In other cases, at 445, the first UE 115-f may optionally determine to send sidelink feedback information to the base station 105-c, which includes a NACK indication for sidelink communication preempted based on SPI and configuration information. In such cases, at 450, the first UE 115-f may send sidelink feedback to the base station 105-c (e.g., during PUCCH transmission). In some cases, providing a NACK indication for sidelink resources that are preempted or in which no PSFCH for sidelink communication is received can provide a UCI transmission to the base station 105-c with the amount of data expected by the base station 105-c, which can provide more efficient and reliable decoding (e.g., because the base station 105-c must perform less or no blind decoding for different assumptions about the UCI size).

[0107] Figure 5A block diagram 500 illustrates a device 505 supporting sidelink feedback preemption and uplink multiplexing in wireless communication according to aspects of this disclosure. Device 505 may be an example of an aspect of UE 115 as described herein. Device 505 may include a receiver 510, a communication manager 515, and a transmitter 520. Device 505 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0108] Receiver 510 can receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to sidelink feedback preemption and uplink multiplexing in wireless communication). The information can be transmitted to other components of device 505. Receiver 510 can serve as a reference. Figure 8 Examples of aspects of the transceiver 820 described. The receiver 510 may utilize a single antenna or an array of antennas.

[0109] The communication manager 515 can receive sidelink communication from the second UE via the sidelink channel between the first UE and the second UE, identify a set of sidelink feedback resources for feedback transmission to the second UE, provide feedback associated with the sidelink communication from the second UE, receive an SPI indicating that one or more sidelink communications between the first UE and the second UE have been preempted, and determine whether to send feedback transmission to the second UE via the set of sidelink feedback resources based on the SPI.

[0110] Communication manager 515 can also transmit sidelink communication to the second UE via a sidelink channel between the first UE and the second UE, identify a set of sidelink feedback resources associated with the reception of sidelink communication at the second UE, receive an SPI indicating that one or more sidelink communications between the first UE and the second UE have been preempted, and determine, based on the SPI, whether to send sidelink feedback from the second UE to the serving base station. Communication manager 515 may be an example of an aspect of communication manager 810 described herein.

[0111] The communication manager 515 described herein can be implemented to achieve one or more potential advantages. One implementation may allow device 505 to determine preemption for one or more sidelink communications, which may include sidelink feedback communications. Such operation can provide improvements in reliability and efficiency in communications with sidelink UEs and with other UEs that can send or receive high-priority or low-latency communications. These improvements can enhance the efficiency of wireless communication at the UE by allowing flexible allocation of sidelink resources using configurable preemption in cases where other communications may conflict with sidelink resources. Thus, the supported techniques may include improved network and UE operation, and in some examples, may improve network efficiency, reduce latency, and provide network scheduling flexibility, among other benefits.

[0112] The communication manager 515 or its sub-components may be implemented in hardware, processor-executable code (e.g., software or firmware), or any combination thereof. If implemented in processor-executable code, the functionality of the communication manager 515 or its sub-components may be performed by a general-purpose processor, DSP, application-specific integrated circuit (ASIC), FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware component, or any combination thereof designed to perform the functions described in this disclosure.

[0113] The communication manager 515 or its subcomponents may be physically located in various locations, including being distributed such that portions of the functionality are implemented by one or more physical components in different physical locations. In some examples, according to various aspects of this disclosure, the communication manager 515 or its subcomponents may be separate and distinct components. In some examples, according to various aspects of this disclosure, the communication manager 515 or its subcomponents may be combined with one or more other hardware components (including, but not limited to, input / output (I / O) components, transceivers, network servers, other computing devices, one or more other components described in this disclosure, or combinations thereof).

[0114] Transmitter 520 can transmit signals generated by other components of device 505. In some examples, transmitter 520 may coexist with receiver 510 in a transceiver module. For example, transmitter 520 may be a reference... Figure 8 Examples of aspects of the transceiver 820 described. The transmitter 520 may utilize a single antenna or an array of antennas.

[0115] Figure 6A block diagram 600 illustrates a device 605 supporting sidelink feedback preemption and uplink multiplexing in wireless communication according to aspects of this disclosure. Device 605 may be an example of aspects of device 505 or UE 115 as described herein. Device 605 may include a receiver 610, a communication manager 615, and a transmitter 635. Device 605 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0116] Receiver 610 can receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to sidelink feedback preemption and uplink multiplexing in wireless communication). The information can be transmitted to other components of device 605. Receiver 610 can be a reference. Figure 8 Examples of aspects of the transceiver 820 described. The receiver 610 may utilize a single antenna or an array of antennas.

[0117] Communication manager 615 may be an example of an aspect of communication manager 515 described herein. Communication manager 615 may include sidelink communication manager 620, sidelink feedback manager 625, and sidelink preemption manager 630. Communication manager 615 may be an example of an aspect of communication manager 810 described herein.

[0118] In some cases, the sidelink communication manager 620 can receive sidelink communication from the second UE via a sidelink channel between the first UE and the second UE. The sidelink feedback manager 625 can identify a set of sidelink feedback resources for sending feedback to the second UE, providing feedback associated with the sidelink communication from the second UE. The sidelink preemption manager 630 can receive an SPI indicating that one or more sidelink communications between the first UE and the second UE have been preempted, and determine whether to send feedback to the second UE via the sidelink feedback resource set based on the SPI.

[0119] In some cases, the sidelink communication manager 620 can send sidelink communication to the second UE via the sidelink channel between the first UE and the second UE. The sidelink feedback manager 625 can identify a set of sidelink feedback resources associated with the reception of sidelink communication at the second UE and sidelink feedback from the second UE. The sidelink preemption manager 630 can receive an SPI indicating that one or more sidelink communications between the first UE and the second UE have been preempted, and determine whether to send sidelink feedback from the second UE to the serving base station based on the SPI.

[0120] Transmitter 635 can transmit signals generated by other components of device 605. In some examples, transmitter 635 may coexist with receiver 610 in a transceiver module. For example, transmitter 635 may be a reference... Figure 8 Examples of aspects of the transceiver 820 described. The transmitter 635 may utilize a single antenna or an array of antennas.

[0121] Figure 7 A block diagram 700 illustrates a communication manager 705 supporting sidelink feedback preemption and uplink multiplexing in wireless communication according to aspects of this disclosure. Communication manager 705 may be an example of aspects of communication manager 515, communication manager 615, or communication manager 810 described herein. Communication manager 705 may include a sidelink communication manager 710, a sidelink feedback manager 715, a sidelink preemption manager 720, and a configuration manager 725. Each of these modules may communicate directly or indirectly with each other (e.g., via one or more buses).

[0122] The sidelink communication manager 710 can receive sidelink communication from the second UE via the sidelink channel between the first UE and the second UE. In some examples, the sidelink communication manager 710 can send sidelink communication to the second UE via the sidelink channel between the first UE and the second UE. In some examples, the sidelink communication manager 710 can send sidelink feedback to the serving base station.

[0123] The sidelink feedback manager 715 can identify a set of sidelink feedback resources for sending feedback to the second UE, providing feedback associated with sidelink communication from the second UE. In some examples, the sidelink feedback manager 715 can identify a set of sidelink feedback resources for receiving sidelink feedback from the second UE associated with sidelink communication at the second UE. In some examples, the sidelink feedback manager 715 can send feedback via the set of sidelink feedback resources. In some examples, the sidelink feedback manager 715 can send or preempt feedback based on configuration information. In some cases, the negative acknowledgment indication of the sidelink feedback provides a uniform payload size for uplink control information transmission, including sidelink feedback, to the serving base station.

[0124] The sidelink preemption manager 720 can receive an SPI indicating that one or more sidelink communications between the first UE and the second UE have been preempted. In some examples, the sidelink preemption manager 720 can determine, based on the SPI, whether to send feedback to the second UE via a sidelink feedback resource set. In some examples, the sidelink preemption manager 720 can determine, based on the SPI, whether to send sidelink feedback from the second UE to the serving base station.

[0125] In some examples, the sidelink preemption manager 720 can determine that feedback transmission should be sent when the SPI is associated with the sidelink feedback resource set. In some examples, the sidelink preemption manager 720 can determine that feedback transmission should be preempted when the SPI is associated with the sidelink feedback resource set. In some examples, the sidelink preemption manager 720 can preempt feedback transmission via the sidelink feedback resource set.

[0126] In some examples, the sidelink preemption manager 720 may determine to preempt the transmission of sidelink feedback to the serving base station based on an SPI indicating preemption of sidelink resources or a set of sidelink feedback resources associated with sidelink communication. In some examples, the sidelink preemption manager 720 may set sidelink feedback from the second UE to indicate negative acknowledgment based on an SPI indicating preemption of sidelink resources associated with sidelink communication. In some examples, the sidelink preemption manager 720 may set sidelink feedback from the second UE to indicate negative acknowledgment based on an SPI indicating preemption of a set of sidelink feedback resources or based on the absence of sidelink feedback in the set of sidelink feedback resources.

[0127] In some cases, the determination is based on one or more parameters associated with sidelink communication and one or more corresponding parameters associated with the SPI. In some cases, the one or more parameters include: the priority of the sidelink communication, the priority indicated by the SPI, the unicast or multicast transmission type associated with the sidelink communication, a Reference Signal Received Power (RSRP) measurement, a partition identifier indicated by the SPI, a resource pool identifier provided by the ID SPI, or any combination thereof. In some cases, the RSRP measurement is associated with a reference signal from the serving base station, and the sidelink feedback transmission is based on an RSRP at or below a receive power threshold provided by one or more parameters. In some examples, two or more individual RSRP thresholds are provided for two or more priorities of the SPI, two or more priorities of the sidelink communication, or any combination thereof.

[0128] In some cases, the SPI provides one or more of the following: a time / frequency indication of the sidelink resource to be preempted, a priority associated with the SPI, a partition identifier, one or more reference signal receive power thresholds for preemption determination, the periodicity of the preempted resource, a sidelink resource pool identifier, or any combination thereof.

[0129] Configuration Manager 725 can receive configuration information indicating whether feedback transmission using sidelink feedback resources should be preempted when the SPI is associated with a set of sidelink feedback resources. In some cases, the configuration information is associated with a first UE, with a resource pool in a resource pool set, with a carrier in a carrier set, or any combination thereof. In other cases, the configuration information is received along with sidelink configuration for sidelink communication, in radio resource control signaling from the serving base station, or any combination thereof.

[0130] Figure 8 A diagram illustrating a system 800 including device 805 supporting sidelink feedback preemption and uplink multiplexing in wireless communication, according to aspects of this disclosure. Device 805 may be an example of or include components of device 505, device 605, or UE 115 as described herein. Device 805 may include components for bidirectional voice and data communication, including components for transmitting and receiving communications, including a communication manager 810, an I / O controller 815, a transceiver 820, an antenna 825, a memory 830, and a processor 840. These components may communicate electronically via one or more buses (e.g., bus 845).

[0131] In some cases, the communication manager 810 can receive sidelink communication from the second UE via a sidelink channel between the first UE and the second UE, identify a set of sidelink feedback resources for feedback transmission to the second UE, provide feedback associated with the sidelink communication from the second UE, receive an SPI indicating that one or more sidelink communications between the first UE and the second UE have been preempted, and determine whether to send feedback transmission to the second UE via the set of sidelink feedback resources based on the SPI.

[0132] In some cases, the communication manager 810 may also send sidelink communication to the second UE via the sidelink channel between the first UE and the second UE, identify a set of sidelink feedback resources associated with the reception of sidelink communication at the second UE, receive an SPI indicating that one or more sidelink communications between the first UE and the second UE have been preempted, and determine whether to send sidelink feedback from the second UE to the serving base station based on the SPI.

[0133] The communication manager 810 described herein can be implemented to achieve one or more potential advantages. One implementation may allow device 805 to determine preemption for one or more sidelink communications, which may include sidelink feedback communications. Such operation can provide improvements in reliability and efficiency in communications with sidelink UEs and with other UEs that can send or receive high-priority or low-latency communications. These improvements can enhance the efficiency of wireless communication at the UE by allowing flexible allocation of sidelink resources using configurable preemption in cases where other communications may conflict with sidelink resources. Thus, the supported techniques may include improved network and UE operation, and in some examples, may improve network efficiency, reduce latency, and provide network scheduling flexibility, among other benefits.

[0134] The I / O controller 815 can manage the input and output signals used by the device 805. The I / O controller 815 can also manage peripheral devices not integrated into the device 805. In some cases, the I / O controller 815 can represent a physical connection or port to an external peripheral device. In some cases, the I / O controller 815 can utilize operating systems such as: Or another known operating system. In other cases, the I / O controller 815 may represent or interact with a modem, keyboard, mouse, touchscreen, or similar device. In some cases, the I / O controller 815 may be implemented as part of the processor. In some cases, the user may interact with the device 805 via the I / O controller 815 or via hardware components controlled by the I / O controller 815.

[0135] Transceiver 820 can communicate bidirectionally via one or more antennas, wired or wireless links as described above. For example, transceiver 820 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. Transceiver 820 may also include a modem to modulate packets and provide modulated packets to an antenna for transmission, and demodulate packets received from the antenna.

[0136] In some cases, a wireless device may include a single antenna 825. However, in other cases, the device may have more than one antenna 825, which is capable of transmitting or receiving multiple wireless transmissions simultaneously.

[0137] Memory 830 may include RAM and ROM. Memory 830 may store computer-readable, computer-executable code 835, which includes instructions that, when executed, cause the processor to perform the various functions described herein. In some cases, memory 830 may contain a BIOS, which controls basic hardware or software operations, such as interaction with peripheral components or devices.

[0138] Processor 840 may include intelligent hardware devices (e.g., general-purpose processors, DSPs, CPUs, microcontrollers, ASICs, FPGAs, programmable logic devices, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some cases, processor 840 may be configured to use a memory controller to operate a memory array. In other cases, the memory controller may be integrated into processor 840. Processor 840 may be configured to execute computer-readable instructions stored in memory (e.g., memory 830) to cause device 805 to perform various functions (e.g., functions or tasks supporting sidelink feedback preemption and uplink multiplexing in wireless communications).

[0139] Code 835 may include instructions for implementing aspects of this disclosure, including instructions for supporting wireless communication. Code 835 may be stored in a non-transitory computer-readable medium, such as system memory or other types of memory. In some cases, code 835 may not be directly executable by processor 840, but may enable a computer (e.g., when compiled and executed) to perform the functions described herein.

[0140] Figure 9 A block diagram 900 illustrates an apparatus 905 supporting sidelink feedback preemption and uplink multiplexing in wireless communication according to aspects of this disclosure. Apparatus 905 may be an example of an aspect of base station 105 as described herein. Apparatus 905 may include a receiver 910, a communication manager 915, and a transmitter 920. Apparatus 905 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0141] Receiver 910 can receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to sidelink feedback preemption and uplink multiplexing in wireless communication). This information can be transmitted to other components of device 905. Receiver 910 can serve as a reference. Figure 12 Examples of aspects of the transceiver 1220 described. The receiver 910 may utilize a single antenna or an array of antennas.

[0142] Communication manager 915 can send configuration information to one or more UEs, indicating whether feedback transmission using sidelink feedback resources should be preempted when the SPI is associated with a set of sidelink feedback resources, sending an SPI indicating that one or more sidelink communications between one or more UEs are preempted, and monitoring SPI-based sidelink feedback from one or more UEs. Communication manager 915 may be an example of an aspect of communication manager 1210 described herein.

[0143] The communication manager 915 or its sub-components may be implemented in hardware, processor-executable code (e.g., software or firmware), or any combination thereof. If implemented in processor-executable code, the functionality of the communication manager 915 or its sub-components may be performed by a general-purpose processor, DSP, application-specific integrated circuit (ASIC), FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware component, or any combination thereof designed to perform the functions described in this disclosure.

[0144] The communication manager 915 or its sub-components may be physically located in various locations, including distributed such that portions of the functionality are implemented by one or more physical components in different physical locations. In some examples, according to various aspects of this disclosure, the communication manager 915 or its sub-components may be separate and distinct components. In some examples, according to various aspects of this disclosure, the communication manager 915 or its sub-components may be combined with one or more other hardware components (including, but not limited to, input / output (I / O) components, transceivers, network servers, other computing devices, one or more other components described in this disclosure, or combinations thereof).

[0145] Transmitter 920 can transmit signals generated by other components of device 905. In some examples, transmitter 920 may coexist with receiver 910 in a transceiver module. For example, transmitter 920 may be a reference... Figure 12 Examples of aspects of the transceiver 1220 described. The transmitter 920 may utilize a single antenna or an array of antennas.

[0146] Figure 10 A block diagram 1000 illustrates a device 1005 supporting sidelink feedback preemption and uplink multiplexing in wireless communication according to aspects of this disclosure. Device 1005 may be an example of aspects of device 905 or base station 105 as described herein. Device 1005 may include receiver 1010, communication manager 1015, and transmitter 1035. Device 1005 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0147] Receiver 1010 can receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to sidelink feedback preemption and uplink multiplexing in wireless communication). The information can be transmitted to other components of device 1005. Receiver 1010 can serve as a reference. Figure 12 Examples of aspects of the transceiver 1220 described. The receiver 1010 may utilize a single antenna or an array of antennas.

[0148] Communication manager 1015 may be an example of an aspect of communication manager 915 described herein. Communication manager 1015 may include configuration manager 1020, sidelink preemption manager 1025, and sidelink feedback manager 1030. Communication manager 1015 may be an example of an aspect of communication manager 1210 described herein.

[0149] Configuration Manager 1020 can send configuration information to one or more UEs, indicating whether feedback transmission using sidelink feedback resources should be preempted when the SPI is associated with a set of sidelink feedback resources.

[0150] The sidelink preemption manager 1025 can send an SPI indicating that one or more sidelink communications between one or more UEs have been preempted.

[0151] The sidelink feedback manager 1030 can monitor SPI-based sidelink feedback from one or more UEs.

[0152] Transmitter 1035 can transmit signals generated by other components of device 1005. In some examples, transmitter 1035 may coexist with receiver 1010 in a transceiver module. For example, transmitter 1035 may be a reference... Figure 12 Examples of aspects of the transceiver 1220 described. The transmitter 1035 may utilize a single antenna or an array of antennas.

[0153] Figure 11 A block diagram 1100 illustrates a communication manager 1105 supporting sidelink feedback preemption and uplink multiplexing in wireless communication according to aspects of this disclosure. Communication manager 1105 may be an example of aspects of communication manager 915, communication manager 1015, or communication manager 1210 described herein. Communication manager 1105 may include configuration manager 1110, sidelink preemption manager 1115, and sidelink feedback manager 1120. Each of these modules may communicate directly or indirectly with each other (e.g., via one or more buses).

[0154] Configuration Manager 1110 can send configuration information to one or more UEs, indicating whether feedback transmission using sidelink feedback resources should be preempted when the SPI is associated with a set of sidelink feedback resources.

[0155] The sidelink preemption manager 1115 can send an SPI indicating that one or more sidelink communications between one or more UEs have been preempted. In some cases, the SPI provides one or more of the following: a time / frequency indication of the sidelink resource to be preempted, a priority associated with the SPI, a partition identifier, one or more reference signal received power thresholds for preemption determination, the periodicity of the preempted resource, a sidelink resource pool identifier, or any combination thereof.

[0156] The sidelink feedback manager 1120 can monitor SPI-based sidelink feedback from one or more UEs. In some cases, the sidelink feedback indicates negative acknowledgment based on the SPI. In other cases, the sidelink feedback from one or more UEs indicates negative acknowledgment based on the SPI indicating preemption of the sidelink feedback resource set or based on the absence of sidelink feedback in the sidelink feedback resource set. In some cases, the negative acknowledgment indication of the sidelink feedback provides a uniform payload size for the transmission of uplink control information, including the sidelink feedback, to the base station.

[0157] Figure 12 A diagram illustrating a system 1200 including device 1205 supporting sidelink feedback preemption and uplink multiplexing in wireless communication, according to aspects of this disclosure. Device 1205 may be an example of or include components of device 905, device 1005, or base station 105 described herein. Device 1205 may include components for bidirectional voice and data communication, including components for transmitting and receiving communications, including a communication manager 1210, a network communication manager 1215, a transceiver 1220, an antenna 1225, a memory 1230, a processor 1240, and an inter-station communication manager 1245. These components may communicate electronically via one or more buses (e.g., bus 1250).

[0158] The communication manager 1210 can send configuration information to one or more UEs, indicating whether feedback transmission using sidelink feedback resources should be preempted when the SPI is associated with a set of sidelink feedback resources, sending an SPI indicating that one or more sidelink communications between one or more UEs are preempted, and monitoring SPI-based sidelink feedback from one or more UEs.

[0159] The network communication manager 1215 can manage communication with the core network (e.g., via one or more wired backhaul links). For example, the network communication manager 1215 can manage the delivery of data communication for client devices (such as one or more UEs 115).

[0160] As described above, transceiver 1220 can communicate bidirectionally via one or more antennas, wired or wireless links. For example, transceiver 1220 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. Transceiver 1220 may also include a modem to modulate packets and provide modulated packets to an antenna for transmission, and demodulate packets received from the antenna.

[0161] In some cases, a wireless device may include a single antenna 1225. However, in other cases, the device may have more than one antenna 1225, which may be able to transmit or receive multiple wireless transmissions simultaneously.

[0162] Memory 1230 may include RAM, ROM, or a combination thereof. Memory 1230 may store computer-readable code 1235 including instructions that, when executed by a processor (e.g., processor 1240), cause the device to perform the various functions described herein. In some cases, memory 1230 may include a BIOS, which controls basic hardware or software operations, such as interaction with peripheral components or devices.

[0163] Processor 1240 may include intelligent hardware devices (e.g., general-purpose processors, DSPs, CPUs, microcontrollers, ASICs, FPGAs, programmable logic devices, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some cases, processor 1240 may be configured to operate a memory array using a memory controller. In some cases, the memory controller may be integrated into processor 1240. Processor 1240 may be configured to execute computer-readable instructions stored in memory (e.g., memory 1230) to cause device 1205 to perform various functions (e.g., functions or tasks supporting sidelink feedback preemption and uplink multiplexing in wireless communications).

[0164] Inter-site communication manager 1245 can manage communication with other base stations 105 and may include a controller or scheduler for controlling communication with UEs 115 that cooperate with other base stations 105. For example, inter-site communication manager 1245 can coordinate the scheduling of transmissions to UE 115 for various interference mitigation techniques, such as beamforming or joint transmission. In some examples, inter-site communication manager 1245 may provide an X2 interface within LTE / LTE-A wireless communication network technology to provide communication between base stations 105.

[0165] Code 1235 may include instructions for implementing aspects of this disclosure, including instructions for supporting wireless communication. Code 1235 may be stored in a non-transitory computer-readable medium, such as system memory or other types of memory. In some cases, code 1235 may not be directly executable by processor 1240, but may enable a computer (e.g., when compiled and executed) to perform the functions described herein.

[0166] Figure 13 A flowchart illustrating a method 1300 supporting sidelink feedback preemption and uplink multiplexing in wireless communication is shown according to aspects of this disclosure. Operation of method 1300 can be implemented by a UE 115 or its components as described herein. For example, operation of method 1300 can be implemented by, as referenced... Figures 5 to 8 The described communication manager is used to execute this. In some examples, the UE can execute a set of instructions to control the UE's functional elements to perform the functions described below. Additionally or alternatively, the UE can use dedicated hardware to perform aspects of the functions described below.

[0167] Optionally, at 1305, the UE may receive configuration information indicating whether feedback transmission using sidelink feedback resources should be preempted when the SPI is associated with a set of sidelink feedback resources. The operation of 1305 can be performed according to the methods described herein. In some examples, aspects of the operation of 1305 may be as described in the references... Figures 5 to 8 The configuration manager described is used to execute this.

[0168] At 1310, the UE can receive sidelink communication from the second UE via the sidelink channel between the first UE and the second UE. The operation of 1310 can be performed according to the method described herein. In some examples, aspects of the operation of 1310 can be derived from, as referenced... Figures 5 to 8 The sidelink communication manager is described and executed.

[0169] At 1315, the UE can identify a set of sidelink feedback resources for feedback transmission to the second UE, providing feedback associated with sidelink communication from the second UE. The operation at 1315 can be performed according to the methods described herein. In some examples, aspects of the operation at 1315 can be derived from, as referenced... Figures 5 to 8 The described sidelink feedback manager is used to execute this.

[0170] At 1320, the UE can receive an SPI indicating that one or more sidelink communications between the first UE and the second UE have been preempted. The operation of 1320 can be performed according to the methods described herein. In some examples, aspects of the operation of 1320 can be derived from, as referenced... Figures 5 to 8 The sidelink preemption manager is described and executed.

[0171] At point 1325, the UE can determine whether to send feedback to the second UE via the sidelink feedback resource set based on the SPI. The operation at point 1325 can be performed according to the method described herein. In some examples, aspects of the operation at point 1325 can be derived from, as referenced... Figures 5 to 8 The sidelink preemption manager is described and executed.

[0172] Optionally, at 1330, the UE can send or preempt feedback transmission based on configuration information. The operation at 1330 can be performed according to the methods described herein. In some examples, aspects of the operation at 1330 can be derived from, as referenced... Figures 5 to 8 The described sidelink feedback manager is used to execute this.

[0173] Figure 14 A flowchart illustrating a method 1400 supporting sidelink feedback preemption and uplink multiplexing in wireless communication is shown according to aspects of this disclosure. Operation of method 1400 can be implemented by a UE 115 or its components as described herein. For example, operation of method 1400 can be implemented by, as referenced... Figures 5 to 8 The described communication manager is used to execute this. In some examples, the UE can execute a set of instructions to control the UE's functional elements to perform the functions described below. Additionally or alternatively, the UE can use dedicated hardware to perform aspects of the functions described below.

[0174] At point 1405, the UE can receive sidelink communication from the second UE via the sidelink channel between the first UE and the second UE. The operation of point 1405 can be performed according to the method described herein. In some examples, aspects of the operation of point 1405 can be derived from, as referenced... Figures 5 to 8 The sidelink communication manager is described and executed.

[0175] At 1410, the UE can identify a set of sidelink feedback resources for feedback transmission to the second UE, the feedback transmission providing feedback associated with sidelink communication from the second UE. The operation of 1410 can be performed according to the methods described herein. In some examples, aspects of the operation of 1410 can be derived from, as referenced... Figures 5 to 8 The described sidelink feedback manager is used to execute this.

[0176] At point 1415, the UE may receive an SPI indicating that one or more sidelink communications between the first UE and the second UE have been preempted. The operation of point 1415 can be performed according to the methods described herein. In some examples, aspects of the operation of point 1415 may be as described in the references... Figures 5 to 8 The sidelink preemption manager is described and executed.

[0177] At point 1420, the UE can determine whether feedback transmission should be sent when the SPI is associated with the sidelink feedback resource set. The operation at point 1420 can be performed according to the methods described herein. In some examples, aspects of the operation at point 1420 can be derived from, as referenced... Figures 5 to 8 The sidelink preemption manager is described and executed.

[0178] At point 1425, the UE can transmit feedback via the sidelink feedback resource set. The operation at point 1425 can be performed according to the methods described herein. In some examples, aspects of the operation at point 1425 can be derived from, as referenced... Figures 5 to 8 The described sidelink feedback manager is used to execute this.

[0179] Figure 15 A flowchart illustrating a method 1500 supporting sidelink feedback preemption and uplink multiplexing in wireless communication is shown according to aspects of this disclosure. Operation of method 1500 can be implemented by a UE 115 or its components as described herein. For example, operation of method 1500 can be implemented by, as referenced... Figures 5 to 8 The described communication manager is used to execute this. In some examples, the UE can execute a set of instructions to control the UE's functional elements to perform the functions described below. Additionally or alternatively, the UE can use dedicated hardware to perform aspects of the functions described below.

[0180] At point 1505, the UE can receive sidelink communication from the second UE via the sidelink channel between the first UE and the second UE. The operation of point 1505 can be performed according to the method described herein. In some examples, aspects of the operation of point 1505 can be derived from, as referenced... Figures 5 to 8 The sidelink communication manager is described and executed.

[0181] At point 1510, the UE can identify a set of sidelink feedback resources for feedback transmission to the second UE, the feedback transmission providing feedback associated with sidelink communication from the second UE. The operation of point 1510 can be performed according to the methods described herein. In some examples, aspects of the operation of point 1510 can be derived from, as referenced... Figures 5 to 8 The described sidelink feedback manager is used to execute this.

[0182] At point 1515, the UE can receive an SPI indicating that one or more sidelink communications between the first UE and the second UE have been preempted. The operation of point 1515 can be performed according to the methods described herein. In some examples, aspects of the operation of point 1515 can be derived from, as referenced... Figures 5 to 8 The sidelink preemption manager is described and executed.

[0183] At point 1520, the UE can determine whether feedback transmission should be preempted when associated with the SPI and the sidelink feedback resource set. The operation at point 1520 can be performed according to the method described herein. In some examples, aspects of the operation at point 1520 can be derived from, as referenced... Figures 5 to 8 The sidelink preemption manager is described and executed.

[0184] At point 1525, the UE can preempt the transmission of feedback via the sidelink feedback resource set. The operation at point 1525 can be performed according to the method described herein. In some examples, aspects of the operation at point 1525 can be derived from, as referenced... Figures 5 to 8 The sidelink preemption manager is described and executed.

[0185] Figure 16 A flowchart illustrating a method 1600 supporting sidelink feedback preemption and uplink multiplexing in wireless communication is shown, according to aspects of this disclosure. Operation of method 1600 can be implemented by a UE 115 or its components as described herein. For example, operation of method 1600 can be implemented by, as referenced... Figures 5 to 8 The described communication manager is used to execute this. In some examples, the UE can execute a set of instructions to control the UE's functional elements to perform the functions described below. Additionally or alternatively, the UE can use dedicated hardware to perform aspects of the functions described below.

[0186] At point 1605, the UE can send sidelink communication to the second UE via the sidelink channel between the first UE and the second UE. The operation at point 1605 can be performed according to the method described herein. In some examples, aspects of the operation at point 1605 can be derived from, as referenced... Figures 5 to 8 The sidelink communication manager is described and executed.

[0187] At 1610, the UE can identify a set of sidelink feedback resources associated with the reception of sidelink feedback from the second UE for use in sidelink communication with the second UE. The operation of 1610 can be performed according to the methods described herein. In some examples, aspects of the operation of 1610 can be derived from, as referenced... Figures 5 to 8 The described sidelink feedback manager is used to execute this.

[0188] At point 1615, the UE can receive an SPI indicating that one or more sidelink communications between the first UE and the second UE have been preempted. The operation of point 1615 can be performed according to the methods described herein. In some examples, aspects of the operation of point 1615 can be derived from, as referenced... Figures 5 to 8 The sidelink preemption manager is described and executed.

[0189] At point 1620, the UE can determine whether to send sidelink feedback from the second UE to the serving base station based on the SPI. The operation at point 1620 can be performed according to the method described herein. In some examples, aspects of the operation at point 1620 can be derived from, as referenced... Figures 5 to 8 The sidelink preemption manager is described and executed.

[0190] Figure 17 A flowchart illustrating a method 1700 supporting sidelink feedback preemption and uplink multiplexing in wireless communication is shown according to aspects of this disclosure. Operation of method 1700 can be implemented by a UE 115 or its components as described herein. For example, operation of method 1700 can be implemented by, as referenced... Figures 5 to 8 The described communication manager is used to execute this. In some examples, the UE can execute a set of instructions to control the UE's functional elements to perform the functions described below. Additionally or alternatively, the UE can use dedicated hardware to perform aspects of the functions described below.

[0191] At point 1705, the UE can send sidelink communication to the second UE via the sidelink channel between the first UE and the second UE. The operation at point 1705 can be performed according to the method described herein. In some examples, aspects of the operation at point 1705 can be derived from, as referenced... Figures 5 to 8 The sidelink communication manager is described and executed.

[0192] At 1710, the UE can identify a set of sidelink feedback resources associated with the reception of sidelink feedback from the second UE for use in sidelink communication with the second UE. The operation of 1710 can be performed according to the methods described herein. In some examples, aspects of the operation of 1710 can be derived from, as referenced... Figures 5 to 8 The described sidelink feedback manager is used to execute this.

[0193] At point 1715, the UE can receive an SPI indicating that one or more sidelink communications between the first UE and the second UE have been preempted. The operation of point 1715 can be performed according to the methods described herein. In some examples, aspects of the operation of point 1715 can be derived from, as referenced... Figures 5 to 8 The sidelink preemption manager is described and executed.

[0194] At 1720, the UE can determine the preemption of sending sidelink feedback to the serving base station based on the SPI indicating the preemption of sidelink resources or sidelink feedback resource sets associated with sidelink communication. The operation at 1720 can be performed according to the methods described herein. In some examples, aspects of the operation at 1720 can be derived from, as referenced... Figures 5 to 8 The sidelink preemption manager is described and executed.

[0195] Figure 18A flowchart illustrating a method 1800 supporting sidelink feedback preemption and uplink multiplexing in wireless communication is shown according to aspects of this disclosure. Operation of method 1800 can be implemented by a UE 115 or its components as described herein. For example, operation of method 1800 can be implemented by, as referenced... Figures 5 to 8 The described communication manager is used to execute this. In some examples, the UE can execute a set of instructions to control the UE's functional elements to perform the functions described below. Additionally or alternatively, the UE can use dedicated hardware to perform aspects of the functions described below.

[0196] At point 1805, the UE can send sidelink communication to the second UE via the sidelink channel between the first UE and the second UE. The operation at point 1805 can be performed according to the method described herein. In some examples, aspects of the operation at point 1805 can be derived from, as referenced... Figures 5 to 8 The sidelink communication manager is described and executed.

[0197] At 1810, the UE can identify a set of sidelink feedback resources associated with the reception of sidelink feedback from the second UE for use in sidelink communication with the second UE. The operation of 1810 can be performed according to the methods described herein. In some examples, aspects of the operation of 1810 can be derived from, as referenced... Figures 5 to 8 The described sidelink feedback manager is used to execute this.

[0198] At point 1815, the UE can receive an SPI indicating that one or more sidelink communications between the first UE and the second UE have been preempted. The operation of point 1815 can be performed according to the methods described herein. In some examples, aspects of the operation of point 1815 can be derived from, as referenced... Figures 5 to 8 The sidelink preemption manager is described and executed.

[0199] At point 1820, the UE can set the sidelink feedback from the second UE to indicate negative acknowledgment based on either the SPI indicating preemption of the sidelink feedback resource set or the absence of sidelink feedback in the sidelink feedback resource set. The operation at point 1820 can be performed according to the methods described herein. In some examples, aspects of the operation at point 1820 can be derived from, as referenced... Figures 5 to 8 The sidelink preemption manager is described and executed.

[0200] At point 1825, the UE can send sidelink feedback to the serving base station. The operation at point 1825 can be performed according to the methods described herein. In some examples, aspects of the operation at point 1825 can be derived from, as referenced... Figures 5 to 8 The sidelink communication manager is described and executed.

[0201] Figure 19A flowchart illustrating a method 1900 supporting sidelink feedback preemption and uplink multiplexing in wireless communication is shown, according to aspects of this disclosure. Operation of method 1900 can be implemented by a base station 105 or its components as described herein. For example, operation of method 1900 can be implemented by, as referenced... Figures 9 to 12 The described communication manager is used to execute this. In some examples, the base station may execute a set of instructions to control the functional elements of the base station to perform the functions described below. Additionally or alternatively, the base station may use dedicated hardware to perform aspects of the functions described below.

[0202] At point 1905, the base station can send configuration information to one or more UEs, indicating whether feedback transmission using sidelink feedback resources should be preempted when the SPI is associated with a set of sidelink feedback resources. The operation at point 1905 can be performed according to the methods described herein. In some examples, aspects of the operation at point 1905 can be derived from, as referenced... Figures 9 to 12 The configuration manager described is used to execute this.

[0203] At point 1910, the base station may send an SPI indicating that one or more sidelink communications between one or more UEs have been preempted. The operation of point 1910 can be performed according to the methods described herein. In some examples, aspects of the operation of point 1910 may be as described in the references... Figures 9 to 12 The sidelink preemption manager is described and executed.

[0204] At point 1915, the base station can monitor SPI-based sidelink feedback from one or more UEs. Operation at point 1915 can be performed according to the methods described herein. In some examples, aspects of operation at point 1915 can be derived from, as referenced... Figures 9 to 12 The described sidelink feedback manager is used to execute this.

[0205] The following provides an overview of aspects of this disclosure:

[0206] Aspect 1: A method for wireless communication at a first UE, comprising: receiving sidelink communication from a second UE via a sidelink channel between the first UE and a second UE; identifying a set of sidelink feedback resources for feedback transmission to the second UE, the feedback transmission providing feedback associated with the sidelink communication from the second UE; receiving a sidelink preemption indication indicating that one or more sidelink communications between the first UE and the second UE have been preempted; and determining, at least in part, whether to transmit feedback transmission to the second UE via the set of sidelink feedback resources based on the sidelink preemption indication.

[0207] Aspect 2: The method of aspect 1, wherein determining includes: determining that feedback transmission is to be transmitted when a sidelink preemption indication is associated with a sidelink feedback resource set; and transmitting the feedback transmission via the sidelink feedback resource set.

[0208] Aspect 3: The method of aspect 1 further includes: determining that feedback transmission is to be preempted when a sidelink preemption indication is associated with a sidelink feedback resource set; and preempting feedback transmission via the sidelink feedback resource set.

[0209] Aspect 4: The method of any one of Aspects 1 to 3 further includes: receiving configuration information indicating whether feedback transmission using sidelink feedback resources should be preempted when a sidelink preemption indication is associated with a set of sidelink feedback resources; and transmitting or preempting feedback transmission based at least in part on the configuration information.

[0210] Aspect 5: The method of aspect 4, wherein the configuration information is associated with a first UE, with a resource pool among multiple resource pools, with a carrier among multiple carriers, or any combination thereof.

[0211] Aspect 6: The method of any one of Aspects 4 to 5, wherein the configuration information is received together with the sidelink configuration for sidelink communication, received in radio resource control signaling from the serving base station, or any combination thereof.

[0212] Aspect 7: The method of any one of Aspects 1 to 6, wherein the determination is based at least in part on one or more parameters associated with sidelink communication and one or more corresponding parameters associated with sidelink preemption indication.

[0213] Aspect 8: The method of aspect 7, wherein one or more parameters include: priority of sidelink communication, priority indicated by sidelink preemption indication, unicast or multicast transmission type associated with sidelink communication, reference signal received power (RSRP) measurement, partition identifier indicated by sidelink preemption indication, resource pool identifier provided by sidelink preemption indication, or any combination thereof.

[0214] Aspect 9: The method of aspect 8, wherein the RSRP measurement is associated with a reference signal from the serving base station, and the sidelink feedback transmission is transmitted at least in part based on the RSRP measurement being at or below a receive power threshold provided by one or more parameters.

[0215] Aspect 10: The method of aspect 9, wherein two or more priorities for sidelink preemption indication, two or more priorities for sidelink communication, or any combination thereof are used to provide two or more separate RSRP thresholds.

[0216] Aspect 11: The method of any one of Aspects 1 to 10, wherein the sidelink preemption indication provides one or more of the following: a time / frequency indication of the sidelink resource to be preempted, a priority associated with the sidelink preemption indication, a partition identifier, one or more reference signal received power thresholds for preemption determination, the periodicity of the preempted resource, a sidelink resource pool identifier, or any combination thereof.

[0217] Aspect 12: A method for wireless communication at a first UE, comprising: transmitting sidelink communication to a second UE via a sidelink channel between the first UE and a second UE; identifying a set of sidelink feedback resources associated with the reception of sidelink communication at the second UE and sidelink feedback from the second UE; receiving a sidelink preemption indication indicating that one or more sidelink communications between the first UE and the second UE have been preempted; and determining, at least in part, whether to transmit sidelink feedback from the second UE to a serving base station based on the sidelink preemption indication.

[0218] Aspect 13: The method of aspect 12, wherein determining includes: determining the preemption of the transmission of sidelink feedback to the serving base station based on a sidelink preemption indication indicating the preemption of sidelink resources or a set of sidelink feedback resources associated with sidelink communication.

[0219] Aspect 14: The method of aspect 12 further includes: setting the sidelink feedback from the second UE to indicate a negative acknowledgment based at least in part on a sidelink preemption indication indicating preemption of sidelink resources associated with sidelink communication; and sending the sidelink feedback to the serving base station.

[0220] Aspect 15: The method of aspect 14 further includes: setting the sidelink feedback from the second UE to indicate negative acknowledgment based at least in part on a sidelink preemption indication based on the preemption of the sidelink feedback resource set or on the absence of sidelink feedback in the sidelink feedback resource set.

[0221] Aspect 16: The method of aspect 15, wherein the negative acknowledgment indication of the sidelink feedback provides a uniform payload size for the transmission of uplink control information, including sidelink feedback, to the serving base station.

[0222] Aspect 17: The method of any one of Aspects 12 to 16, wherein the sidelink preemption indication provides one or more of the following: a time / frequency indication of the sidelink resource to be preempted, a priority associated with the sidelink preemption indication, a partition identifier, one or more reference signal received power thresholds for preemption determination, the periodicity of the preempted resource, a sidelink resource pool identifier, or any combination thereof.

[0223] Aspect 18: An apparatus for wireless communication at a first UE, comprising a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform any of the methods of aspects 1 to 11.

[0224] Aspect 19: An apparatus for wireless communication at a first UE, comprising at least one component for performing the method of any one of Aspects 1 to 11.

[0225] Aspect 20: A non-transitory computer-readable medium storing code for wireless communication at a first UE, the code including instructions executable by a processor to perform the methods of any one of Aspects 1 to 11.

[0226] Aspect 21: An apparatus for wireless communication at a first UE, comprising a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the methods of any one of Aspects 12 to 17.

[0227] Aspect 22: An apparatus for wireless communication at a first UE, comprising at least one component for performing the method of any one of aspects 12 to 17.

[0228] Aspect 23: A non-transitory computer-readable medium storing code for wireless communication at a first UE, the code including instructions executable by a processor to perform the methods of any one of Aspects 12 to 17.

[0229] It should be noted that the methods described in this paper describe possible implementations, and the operations and steps can be rearranged or otherwise modified, and other implementations are also possible. Furthermore, two or more aspects from the methods can be combined.

[0230] While aspects of LTE, LTE-A, LTE-APro, or NR systems may be described for illustrative purposes, and the terms LTE, LTE-A, LTE-APro, or NR may be used in most of the description, the techniques described herein are also applicable beyond LTE, LTE-A, LTE-APro, or NR networks. For example, the techniques described can be applied to a variety of other wireless communication systems, such as Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, and other systems and radio technologies not explicitly mentioned herein.

[0231] The information and signals described herein can be represented using any of a wide variety of different techniques and methods. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the description can be represented by voltage, current, electromagnetic waves, magnetic fields or particles, light fields or particles, or any combination thereof.

[0232] The various illustrative blocks and components described herein can be implemented or executed using a general-purpose processor, DSP, ASIC, CPU, FPGA, or other programmable logic device, discrete gate or transistor logic, discrete hardware component, or any combination thereof designed to perform the functions described herein. The general-purpose processor may be a microprocessor, but alternatively, it may be any processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors combined with a DSP core, or any other such configuration).

[0233] The functions described herein can be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions can be stored as one or more instructions or code on or transmitted via a computer-readable medium. Other examples and implementations are within the scope of this disclosure and the appended claims. For example, due to the nature of software, the functions described herein can be implemented using software executed by a processor, hardware, firmware, hardwired, or any combination thereof. Features implementing the functions can also be physically located in different places, including being distributed such that portions of the functions are implemented in different physical locations.

[0234] Computer-readable media includes both non-transitory computer storage media and communication media, encompassing any medium that facilitates the transfer of computer programs from one place to another. Non-transitory storage media can be any available medium accessible by a general-purpose or special-purpose computer. By way of example, and not limitation, non-transitory computer-readable media can include random access memory (RAM), read-only memory (ROM), electrically erasable programmable ROM (EEPROM), flash memory, compact disc (CD) ROM or other optical disc storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that can be used to carry or store required program code components in the form of instructions or data structures and is accessible by a general-purpose or special-purpose computer or a general-purpose or special-purpose processor. Similarly, any connection is appropriately referred to as computer-readable media. For example, if software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technology (such as infrared, radio, and microwave), then coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technology (such as infrared, radio, and microwave) is included in the definition of computer-readable media. The disks and optical discs used in this article include CDs, laser discs, optical discs, DVDs, floppy disks, and Blu-ray discs, where disks typically reproduce data magnetically, while optical discs reproduce data optically using lasers. Combinations of the above are also included within the scope of computer-readable media.

[0235] As used herein and included in the claims, the word "or" in a list of items (e.g., a list of items beginning with phrases such as "at least one of..." or "one or more of...") indicates an inclusive list, such that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). Similarly, as used herein, the phrase "based on" should not be construed as a reference to a closed set of conditions. For example, an exemplary step described as "based on condition A" may be based on both condition A and condition B without departing from the scope of this disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "at least partially based on".

[0236] In the accompanying drawings, similar components or features may have the same reference numerals. Furthermore, various components of the same type can be distinguished by adding a dash after the reference numeral and a second reference numeral to differentiate between similar components. If only the first reference numeral is used in the specification, the description applies to any of the similar components having the same first reference numeral, regardless of the second or other subsequent reference numerals.

[0237] The description herein, in conjunction with the accompanying drawings, illustrates exemplary configurations and does not represent all examples that can be implemented or that fall within the scope of the claims. The term "example" as used herein means "serving as an example, instance, or illustration," not "preferred" or "superior to other examples." Detailed descriptions include specific details for the purpose of providing an understanding of the described techniques. However, these techniques can be practiced without these specific details. In some instances, known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described examples.

[0238] The description provided herein is intended to enable those skilled in the art to make or use this disclosure. Various modifications to this disclosure will be apparent to those skilled in the art, and the general principles defined herein can be applied to other variations without departing from the scope of this disclosure. Therefore, this disclosure is not limited to the examples and designs described herein, but should be granted the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication at a first user equipment (UE), comprising: Receive sidelink communication from the second UE via the sidelink channel between the first UE and the second UE; A set of sidelink feedback resources is identified for sending feedback to the second UE, the feedback sending providing feedback associated with the sidelink communication from the second UE; Receive a sidelink preemption indication indicating that one or more sidelink communications between the first UE and the second UE have been preempted; as well as Whether to send the feedback transmission to the second UE via the sidelink feedback resource set is determined at least in part based on the sidelink preemption indication.

2. The method of claim 1, wherein the determination includes: It is determined that the feedback should be sent when the sidelink preemption indication is associated with the sidelink feedback resource set; as well as The feedback is sent via the sidelink feedback resource set.

3. The method of claim 1, further comprising: It is determined that the feedback transmission is to be preempted when the sidelink preemption indication is associated with the sidelink feedback resource set; as well as Preempt the feedback transmission via the sidelink feedback resource set.

4. The method of claim 1, further comprising: Receive configuration information, the configuration information indicating whether the feedback transmission using the sidelink feedback resource should be preempted when the sidelink preemption indication is associated with the set of sidelink feedback resources; as well as The feedback transmission is sent or preempted based at least in part on the configuration information.

5. The method of claim 4, wherein the configuration information is associated with the first UE, with a resource pool among a plurality of resource pools, with a carrier among a plurality of carriers, or any combination thereof.

6. The method of claim 4, wherein the configuration information is received together with the sidelink configuration for the sidelink communication, received in radio resource control signaling from the serving base station, or any combination thereof.

7. The method of claim 1, wherein the determination is based at least in part on one or more parameters associated with the sidelink communication and one or more corresponding parameters associated with the sidelink preemption indication.

8. The method of claim 7, wherein the one or more parameters include: The priority of the sidelink communication, the priority indicated by the sidelink preemption indication, the unicast or multicast transmission type associated with the sidelink communication, the Reference Signal Received Power (RSRP) measurement, the partition identifier indicated by the sidelink preemption indication, the resource pool identifier provided by the sidelink preemption indication, or any combination thereof.

9. The method of claim 8, wherein the RSRP measurement is associated with a reference signal from the serving base station, and wherein the sidelink feedback transmission is transmitted at least in part based on the RSRP measurement being at or below a receive power threshold provided by the one or more parameters.

10. The method of claim 9, wherein: Two or more separate RSRP thresholds are provided for two or more priorities for the sidelink preemption indication, two or more priorities for the sidelink communication, or any combination thereof.

11. The method of claim 1, wherein the sidelink preemption indication provides one or more of the following: a time / frequency indication of the sidelink resource to be preempted, a priority associated with the sidelink preemption indication, a partition identifier, one or more reference signal received power thresholds for preemption determination, a periodicity of the preempted resource, a sidelink resource pool identifier, or any combination thereof.

12. A method for wireless communication at a first user equipment (UE), comprising: Sidelink communication is sent to the second UE via the sidelink channel between the first UE and the second UE; A set of sidelink feedback resources that identifies the sidelink feedback from the second UE associated with the reception of the sidelink communication at the second UE; Receive a sidelink preemption indication indicating that one or more sidelink communications between the first UE and the second UE have been preempted; as well as Whether to send the sidelink feedback from the second UE to the serving base station is determined at least in part based on the sidelink preemption indication.

13. The method of claim 12, wherein the determination comprises: The preemption of the transmission of the sidelink feedback to the serving base station is determined based on the sidelink preemption indication, which indicates the preemption of the sidelink resources or the set of sidelink feedback resources associated with the sidelink communication.

14. The method of claim 12, further comprising: The sidelink feedback from the second UE is set to indicate a negative acknowledgment, at least in part based on the sidelink preemption indication that indicates the preemption of the sidelink resources associated with the sidelink communication; as well as The sidelink feedback is sent to the serving base station.

15. The method of claim 14, further comprising: The sidelink feedback from the second UE is set to indicate the negative acknowledgment, at least in part based on the sidelink preemption indication indicating preemption of the sidelink feedback resource set or based on the absence of sidelink feedback in the sidelink feedback resource set.

16. The method of claim 15, wherein the negative acknowledgment indication of the sidelink feedback provides a uniform payload size for uplink control information transmission to the serving base station, including the sidelink feedback.

17. The method of claim 12, wherein the sidelink preemption indication provides one or more of the following: a time / frequency indication of the sidelink resource to be preempted, a priority associated with the sidelink preemption indication, a partition identifier, one or more reference signal received power thresholds for preemption determination, a periodicity of the preempted resource, a sidelink resource pool identifier, or any combination thereof.

18. An apparatus for wireless communication at a first user equipment (UE), comprising: processor, A memory coupled to the processor; as well as Instructions, which are stored in the memory and can be executed by the processor, to cause the device to: Receive sidelink communication from the second UE via the sidelink channel between the first UE and the second UE; A set of sidelink feedback resources is identified for sending feedback to the second UE, the feedback sending providing feedback associated with the sidelink communication from the second UE; Receive a sidelink preemption indication indicating that one or more sidelink communications between the first UE and the second UE have been preempted; as well as Whether to send the feedback transmission to the second UE via the sidelink feedback resource set is determined at least in part based on the sidelink preemption indication.

19. The apparatus of claim 18, wherein the instructions are further executable by the processor to cause the apparatus to: Determine that the feedback transmission is to be sent when the sidelink preemption indication is associated with the sidelink feedback resource set; and The feedback is sent via the sidelink feedback resource set.

20. The apparatus of claim 18, wherein the instructions are further executable by the processor to cause the apparatus to: Determine that the feedback transmission is to be preempted when the sidelink preemption indication is associated with the sidelink feedback resource set; and Preempt the feedback transmission via the sidelink feedback resource set.

21. The apparatus of claim 18, wherein the instructions are further executable by the processor to cause the apparatus to: Receive configuration information, the configuration information indicating whether feedback transmission using sidelink feedback resources should be preempted when the sidelink preemption indication is associated with the set of sidelink feedback resources; and The feedback transmission is sent or preempted based at least in part on the configuration information.

22. The apparatus of claim 18, wherein the determination of sending or preempting the feedback transmission is based at least in part on one or more parameters associated with the sidelink communication and one or more corresponding parameters associated with the sidelink preemption indication.

23. The apparatus of claim 22, wherein one or more parameters include: The priority of the sidelink communication, the priority indicated by the sidelink preemption indication, the unicast or multicast transmission type associated with the sidelink communication, the Reference Signal Received Power (RSRP) measurement, the partition identifier indicated by the sidelink preemption indication, the resource pool identifier provided by the sidelink preemption indication, or any combination thereof.

24. The apparatus of claim 18, wherein the sidelink preemption indication provides one or more of the following: a time / frequency indication of the sidelink resource to be preempted, a priority associated with the sidelink preemption indication, a partition identifier, one or more reference signal received power thresholds for preemption determination, a periodicity of the preempted resource, a sidelink resource pool identifier, or any combination thereof.

25. An apparatus for wireless communication at a first user equipment (UE), comprising: processor, A memory coupled to the processor; as well as Instructions, which are stored in the memory and can be executed by the processor, to cause the device to: Sidelink communication is sent to the second UE via the sidelink channel between the first UE and the second UE; A set of sidelink feedback resources that identifies the sidelink feedback from the second UE associated with the reception of the sidelink communication at the second UE; Receive a sidelink preemption indication indicating that one or more sidelink communications between the first UE and the second UE have been preempted; as well as Whether to send the sidelink feedback from the second UE to the serving base station is determined at least in part based on the sidelink preemption indication.

26. The apparatus of claim 25, wherein the instructions are further executable by the processor to cause the apparatus to: The preemption of the transmission of the sidelink feedback to the serving base station is determined based on the sidelink preemption indication, which indicates the preemption of the sidelink resources or the set of sidelink feedback resources associated with the sidelink communication.

27. The apparatus of claim 25, wherein the instructions are further executable by the processor to cause the apparatus to: The sidelink feedback from the second UE is set to indicate a negative acknowledgment, at least in part based on the sidelink preemption indication indicating preemption of the sidelink resources associated with the sidelink communication; and The sidelink feedback is sent to the serving base station.

28. The apparatus of claim 27, wherein the instructions are further executable by the processor to cause the apparatus to: The sidelink feedback from the second UE is set to indicate the negative acknowledgment, at least in part based on the sidelink preemption indication indicating preemption of the sidelink feedback resource set or based on the absence of sidelink feedback in the sidelink feedback resource set.

29. The apparatus of claim 28, wherein the negative acknowledgment indication of the sidelink feedback provides a uniform payload size for the transmission of uplink control information, including the sidelink feedback, to the serving base station.

30. The apparatus of claim 25, wherein the sidelink preemption indication provides one or more of the following: a time / frequency indication of the sidelink resource to be preempted, a priority associated with the sidelink preemption indication, a partition identifier, one or more reference signal received power thresholds for preemption determination, a periodicity of the preempted resource, a sidelink resource pool identifier, or any combination thereof.

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