Interleaved feedback for sidelink communications via unlicensed channels

Abstract

Methods, systems, and devices for wireless communication are described. A plurality of transmitting user equipments (UEs) may transmit sidelink data transmissions. The receiving sidelink UE may interleave-map sidelink feedback corresponding to the detected sidelink data transmissions to sidelink feedback resources of a common sidelink feedback symbol according to an interleaving mapping rule (e.g., sidelink feedback defining which continuous or discontinuous frequency resources the UE will use to transmit the received sidelink data messages). The receiving UE may map one or more copies of the initial interleaving of the sidelink feedback resources to additional available ones of the sidelink feedback resources in the common feedback symbol.

Description

[0001] Cross-references

[0002] This patent application claims priority to U.S. patent application No. 17 / 855,728, entitled “INTERLACED FEEDBACK FOR SIDELINK COMMUNICATIONS VIAUNLICENSED CHANNELS,” filed by Li et al. on June 30, 2022, which is assigned to the assignee of this application. Technical Field

[0003] The following relates to wireless communications including interleaved feedback for sidelink communications via unlicensed resources. Background Art

[0004] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcast, and the like. These systems may be able to 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) systems, advanced LTE (LTE-A) systems, or LTE-A Pro systems) and fifth generation (5G) systems (which may be referred to as new radio (NR) systems). These systems may employ techniques such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal FDMA (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple access communication system may include one or more base stations, each of which supports wireless communications for communication devices, which may be referred to as user equipment (UE). Summary of the invention

[0005] The described technology relates to improved methods, systems, devices and apparatuses for supporting interleaved feedback of sidelink communication via unlicensed resources. For example, multiple transmitting user equipment (UE) can transmit sidelink data transmission. The receiving sidelink UE can interleave the sidelink feedback corresponding to the detected sidelink data transmission to the sidelink feedback resource of the common sidelink feedback symbol according to the interleaved mapping rule (e.g., defining which continuous or non-continuous frequency resources the UE will use to send the sidelink feedback of the received sidelink data message). The receiving UE can map one or more copies (e.g., additional interleaving) of the initial sidelink feedback interleaving to additional available resources in the sidelink feedback resource in the common feedback symbol. For example, the receiving sidelink UE can determine that one or more physical resource blocks (PRBs) in the common feedback symbol are available (e.g., in response to the received sidelink data transmission, the sidelink feedback resource is not occupied by the initial interleaving of the sidelink resource of the UE or any other sidelink UE), and can send one or more sidelink feedback messages in both the initial interleaving and the copy interleaving (at the unoccupied sidelink feedback resource). The transmission of the sidelink feedback message on both the initial interlace and the replica interlace may result in sidelink feedback signaling that does not generate interference but also satisfies the channel occupancy threshold condition.

[0006] A method for wireless communication at a UE is described. The method may include detecting one or more sidelink messages on an unlicensed channel, the one or more sidelink messages sharing a common sidelink feedback symbol; mapping a first set of sidelink feedback resources of a first interlace in one or more interlaces for each sidelink feedback associated with the one or more sidelink messages according to an interlace mapping rule associated with the sidelink feedback resources of the common sidelink feedback symbol; determining whether to allocate a second set of sidelink feedback resources of a second interlace in one or more interlaces for sidelink feedback associated with a first sidelink message in the one or more sidelink messages based at least in part on whether the second interlace overlaps with an additional first interlace in one or more interlaces used for sidelink feedback associated with a second sidelink message in the one or more sidelink messages, wherein the second interlace is a copy of the first interlace associated with the first sidelink message, and wherein the first sidelink message is addressed to the UE; and transmitting sidelink feedback associated with the first sidelink message via the first interlace during the sidelink feedback symbol according to the mapping and at least in part based on the determination.

[0007] A device for wireless communication is described. The device may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions are executable by the processor to cause the device to detect one or more side link messages on an unlicensed channel, the one or more side link messages sharing a common side link feedback symbol; map a first set of side link feedback resources of a first interlace in one or more interlaces for each side link feedback associated with the one or more side link messages according to an interlace mapping rule associated with the side link feedback resources of the common side link feedback symbol; determine whether to allocate a second set of side link feedback resources of a second interlace in one or more interlaces for side link feedback associated with a first side link message in the one or more side link messages based at least in part on the following aspects: whether the second interlace overlaps with an additional first interlace in one or more interlaces used for side link feedback associated with a second side link message in the one or more side link messages, wherein the second interlace is a copy of the first interlace associated with the first side link message, and wherein the first side link message is addressed to a UE; and send side link feedback associated with the first side link message via the first interlace during the side link feedback symbol according to the mapping and at least in part based on the determination.

[0008] Another apparatus for wireless communication at a UE is described. The apparatus may include components for detecting one or more sidelink messages on an unlicensed channel, the one or more sidelink messages sharing a common sidelink feedback symbol; components for mapping a first set of sidelink feedback resources of a first interlace in one or more interlaces for each sidelink feedback associated with the one or more sidelink messages according to an interlace mapping rule associated with the sidelink feedback resources of the common sidelink feedback symbol; components for determining whether to allocate a second set of sidelink feedback resources of a second interlace in one or more interlaces for sidelink feedback associated with a first sidelink message in the one or more sidelink messages based at least in part on whether the second interlace overlaps with an additional first interlace in one or more interlaces for sidelink feedback associated with a second sidelink message in the one or more sidelink messages, wherein the second interlace is a copy of the first interlace associated with the first sidelink message, and wherein the first sidelink message is addressed to the UE; and components for transmitting sidelink feedback associated with the first sidelink message via the first interlace during the sidelink feedback symbol according to the mapping and at least in part based on the determination.

[0009] A non-transitory computer-readable medium storing code for wireless communication at a UE is described. The code may include instructions executable by a processor to perform the following operations: detecting one or more sidelink messages on an unlicensed channel, the one or more sidelink messages sharing a common sidelink feedback symbol; mapping a first set of sidelink feedback resources of a first interlace in one or more interlaces for each sidelink feedback associated with the one or more sidelink messages according to an interlace mapping rule associated with the sidelink feedback resources of the common sidelink feedback symbol; determining whether to allocate a second set of sidelink feedback resources of a second interlace in one or more interlaces for sidelink feedback associated with a first sidelink message in the one or more sidelink messages based at least in part on whether the second interlace overlaps with an additional first interlace in one or more interlaces used for sidelink feedback associated with a second sidelink message in the one or more sidelink messages, wherein the second interlace is a copy of the first interlace associated with the first sidelink message, and wherein the first sidelink message is addressed to the UE; and transmitting the sidelink feedback associated with the first sidelink message via the first interlace during the sidelink feedback symbol according to the mapping and at least in part based on the determination.

[0010] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for: transmitting sidelink feedback associated with a first sidelink message via a copy of a first interlace during a sidelink feedback symbol based at least in part on determining that the copy of the first interlace for the sidelink feedback associated with the first sidelink message does not overlap with an additional first interlace for sidelink feedback associated with a second sidelink message.

[0011] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for mapping a first staggered repetition of sidelink feedback associated with a first sidelink message to a second sidelink feedback resource set of sidelink feedback symbols according to a repetition mapping rule, wherein the determination is based at least in part on the mapping.

[0012] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the replica mapping rule includes an offset value indicating a number of frequency resources of the side link feedback symbol between a first set of side link feedback resources and a second set of side link feedback resources for the side link feedback symbol.

[0013] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a first interlace and a copy of the first interlace for sidelink feedback associated with a first sidelink message satisfy a channel occupancy threshold for sidelink feedback symbols on an unlicensed channel.

[0014] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for suppressing, based at least in part on determining, transmitting a copy of a first interlace for sidelink feedback associated with a first sidelink message via a second sidelink feedback resource set of sidelink feedback symbols, wherein the second sidelink feedback resource set of sidelink feedback symbols is occupied by an additional first interlace for sidelink feedback associated with a second sidelink message.

[0015] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the sidelink feedback satisfies a channel occupancy threshold for a sidelink feedback symbol on an unlicensed channel.

[0016] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving configuration information including at least parameters for an interleave mapping rule, a replica mapping rule, or both, wherein the mapping is based at least in part on the parameters.

[0017] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for monitoring an unlicensed channel for one or more sidelink messages, wherein detection is based at least in part on monitoring, and wherein at least one of the one or more sidelink messages is addressed to one or more additional UEs.

[0018] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the mapping is based at least in part on an interlace mapping rule and a broadcast type of the first sidelink message.

[0019] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending sidelink feedback includes sending a sidelink feedback message associated with a first sidelink message via a first set of a plurality of physical resource blocks of a first interlace for sidelink feedback, the sidelink feedback message including an acknowledgment message or a negative acknowledgment message, wherein the first sidelink message includes a unicast broadcast type addressed to the UE.

[0020] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending sidelink feedback includes sending a sidelink feedback message associated with a first sidelink message via a first set of a plurality of physical resource blocks of a first interlace for sidelink feedback, the sidelink feedback message including a negative acknowledgement message indicating that the UE failed to decode the first sidelink message, wherein the first sidelink message includes a multicast broadcast type addressed to a plurality of UEs including the UE, and wherein the first set of the plurality of physical resource blocks is allocated to the plurality of UEs for sending the sidelink feedback according to an interlace mapping rule.

[0021] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending sidelink feedback includes sending a sidelink feedback message associated with a first sidelink message via a first set of a plurality of physical resource blocks of a first interlace for sidelink feedback, the sidelink feedback message comprising an acknowledgment message or a negative acknowledgment message, wherein the first sidelink message includes a multicast broadcast type addressed to a plurality of UEs including the UE, and wherein the first set of a plurality of physical resource blocks of the first interlace is allocated to each of the plurality of UEs for sending the sidelink feedback according to an interlace mapping rule.

[0022] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, a first interlace for sidelink feedback includes a plurality of physical resource blocks that are contiguous in frequency. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, a first interlace for sidelink feedback includes a plurality of physical resource blocks that are discontinuous in frequency. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, a first interlace for sidelink feedback includes a plurality of corresponding physical resource blocks associated with a single cyclic shift. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, a first interlace for sidelink feedback includes a plurality of corresponding physical resource blocks associated with a plurality of cyclic shifts.

[0023] A method for wireless communication at a UE is described. The method may include sending one or more sidelink messages on an unlicensed channel, the one or more sidelink messages sharing a common sidelink feedback symbol; mapping a first set of sidelink feedback resources of a first interlace of one or more interlaces for each sidelink feedback associated with the one or more sidelink messages according to an interlace mapping rule associated with the sidelink feedback resources of the common sidelink feedback symbol; and receiving sidelink feedback associated with a first sidelink message of the one or more sidelink messages via the first interlace during the sidelink feedback symbol according to the mapping.

[0024] An apparatus for wireless communication is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions may be executed by the processor to cause the apparatus to send one or more side link messages on an unlicensed channel, the one or more side link messages sharing a common side link feedback symbol; map a first set of side link feedback resources of a first interlace in one or more interlaces for each side link feedback associated with the one or more side link messages according to an interlace mapping rule associated with a side link feedback resource of the common side link feedback symbol; and receive side link feedback associated with a first side link message in the one or more side link messages via the first interlace during the side link feedback symbol according to the mapping.

[0025] Another apparatus for wireless communication at a UE is described. The apparatus may include means for sending one or more sidelink messages on an unlicensed channel, the one or more sidelink messages sharing a common sidelink feedback symbol; means for mapping a first set of sidelink feedback resources of a first interlace of one or more interlaces for each sidelink feedback associated with the one or more sidelink messages according to an interlace mapping rule associated with the sidelink feedback resources of the common sidelink feedback symbol; and means for receiving sidelink feedback associated with a first sidelink message of the one or more sidelink messages via the first interlace during the sidelink feedback symbol according to the mapping.

[0026] A non-transitory computer-readable medium storing code for wireless communication at a UE is described. The code may include instructions executable by a processor to perform the following operations: sending one or more sidelink messages on an unlicensed channel, the one or more sidelink messages sharing a common sidelink feedback symbol; mapping a first set of sidelink feedback resources of a first interlace in one or more interlaces for each sidelink feedback associated with the one or more sidelink messages according to an interlace mapping rule associated with the sidelink feedback resources of the common sidelink feedback symbol; and receiving sidelink feedback associated with a first sidelink message of the one or more sidelink messages via the first interlace during the sidelink feedback symbol according to the mapping.

[0027] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving configuration information including at least parameters for an interleave mapping rule, a replica mapping rule, or both, wherein the mapping is based at least in part on the parameters.

[0028] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for mapping a first set of side link feedback resources of a first interlace for each side link feedback associated with one or more side link messages based at least in part on an interlace mapping rule and a broadcast type of the first side link message; and monitoring the first interlace for each side link feedback associated with the one or more side link messages based at least in part on the mapping, wherein receiving the side link feedback associated with the first side link message is based at least in part on the monitoring.

[0029] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving sidelink feedback includes receiving a sidelink feedback message associated with a first sidelink message via a first set of a first interlace of multiple physical resource blocks for sidelink feedback, the sidelink feedback message including an acknowledgment message or a negative acknowledgment message, wherein the first sidelink message includes a unicast broadcast type.

[0030] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving sidelink feedback includes receiving at least one sidelink feedback message associated with a first sidelink message via a first set of a plurality of physical resource blocks of a first interlace for sidelink feedback, the sidelink feedback message including a negative acknowledgement message indicating that at least one UE of a plurality of UEs failed to decode the first sidelink message, wherein the first sidelink message includes a multicast broadcast type addressed to the plurality of UEs, and wherein the first set of physical resource blocks is allocated to the plurality of UEs for sending the sidelink feedback according to an interlace mapping rule.

[0031] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving sidelink feedback includes receiving a sidelink feedback message associated with a first sidelink message via a first set of a plurality of physical resource blocks of a first interlace for sidelink feedback, the sidelink feedback message comprising an acknowledgment message or a negative acknowledgment message, wherein the first sidelink message comprises a multicast broadcast type addressed to a plurality of UEs, and wherein the first set of the plurality of physical resource blocks is allocated to respective UEs of the plurality of UEs for sending the sidelink feedback according to an interlace mapping rule.

[0032] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, a first interlace for sidelink feedback includes a plurality of physical resource blocks that are contiguous in frequency. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, a first interlace for sidelink feedback includes a plurality of physical resource blocks that are discontinuous in frequency. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, a first interlace for sidelink feedback includes a plurality of corresponding physical resource blocks associated with a single cyclic shift. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, a first interlace for sidelink feedback includes a plurality of corresponding physical resource blocks associated with a plurality of cyclic shifts. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 An example of a wireless communication system supporting staggered feedback for sidelink communications via an unlicensed channel in accordance with one or more aspects of the present disclosure is illustrated.

[0034] Figure 2An example of a wireless communication system supporting staggered feedback for sidelink communications via an unlicensed channel in accordance with one or more aspects of the present disclosure is illustrated.

[0035] Figure 3 An example of a sidelink staggered feedback scheme supporting staggered feedback of sidelink communications via an unlicensed channel in accordance with one or more aspects of the present disclosure is illustrated.

[0036] Figure 4 An example of a sidelink staggered feedback scheme supporting staggered feedback of sidelink communications via an unlicensed channel in accordance with one or more aspects of the present disclosure is illustrated.

[0037] Figure 5 An example of a sidelink staggered feedback scheme supporting staggered feedback of sidelink communications via an unlicensed channel in accordance with one or more aspects of the present disclosure is illustrated.

[0038] Figure 6 An example of a sidelink staggered feedback scheme supporting staggered feedback of sidelink communications via an unlicensed channel in accordance with one or more aspects of the present disclosure is illustrated.

[0039] Figure 7 An example of a process flow for supporting staggered feedback for sidelink communications via an unlicensed channel in accordance with one or more aspects of the present disclosure is illustrated.

[0040] Figure 8 and Fig. 9 A block diagram of an apparatus supporting staggered feedback for sidelink communications via an unlicensed channel is shown in accordance with one or more aspects of the present disclosure.

[0041] Fig.10 A block diagram of a communications manager supporting staggered feedback for sidelink communications via an unlicensed channel is shown in accordance with one or more aspects of the present disclosure.

[0042] Fig.11 A diagram of a system including a device supporting staggered feedback for sidelink communications via an unlicensed channel is shown in accordance with one or more aspects of the present disclosure.

[0043] Figures 12 to 17 A flow chart illustrating a method of supporting staggered feedback for sidelink communications via an unlicensed channel in accordance with one or more aspects of the present disclosure is shown. DETAILED DESCRIPTION

[0044] A wireless communication system may support sidelink communications between user equipment (UEs). Sidelink UEs may communicate with each other via sidelink channels (e.g., physical sidelink shared channels (PSSCH)). Sidelink UEs may convey feedback signaling (e.g., an acknowledgement (ACK) message or a negative acknowledgement (NACK) message) on a feedback symbol (e.g., a physical sidelink feedback channel (PSFCH)). The receiving sidelink UE may map the feedback signaling to the PSFCH resource based on one or more mapping rules. The number and location of PSFCH resources may depend on the number of sidelink transmissions (e.g., how many transmitting UEs occupy the time and frequency resources of the PSSCH) or the type of transmission (e.g., the type of transmission). For example, feedback messages for unicast messages or some types of multicast messages (e.g., only NACK feedback messages) may occupy a small amount of resources (e.g., a single physical resource block (PRB) in a PSFCH symbol), while feedback messages for other multicast messages (e.g., ACK or NACK feedback messages) may occupy a large amount of resources (e.g., one PRB for each UE of the multicast message).

[0045] In some wireless communication systems, a sidelink UE may perform sidelink communications on an unlicensed frequency resource, such as a 20 MHz listen-before-talk (LBT) channel. Such channels may be subject to occupied channel bandwidth (OCB) conditions. Under such conditions, sidelink data transmissions, sidelink feedback transmissions, or both may be supported if such signaling meets a threshold amount of the nominal channel bandwidth. However, the number of feedback messages sent during a PSFCH symbol within an LBT subchannel may vary dynamically based on the number of PSSCH transmissions and based on the broadcast type of the sidelink transmission. Therefore, a fixed interleaving pattern for sidelink data transmissions or a limited mapping pattern for sending sidelink feedback messages may not result in feedback transmissions that meet the OCB condition.

[0046] The wireless communication system may support an adaptive interleaving scheme for sidelink transmissions and feedback signaling, resulting in sidelink feedback signaling that satisfies the OCB condition on the PSFCH, regardless of the number or broadcast type of the sidelink transmissions corresponding to the feedback signaling. Such an adaptive interleaving scheme may support an interleaved mapping of sidelink resources to sidelink feedback resources, and then replicate the interleaving across the PSFCH so that the OCB condition is satisfied. Multiple transmitting UEs may transmit sidelink data transmissions on various sidelink resources (e.g., PRBs or subchannels) on the PSSCH of an unlicensed channel (e.g., a 20 MHz LBT channel).

[0047] The receiving sidelink UE may detect all transmitted sidelink messages (e.g., may decode the sidelink control information associated with each transmitted sidelink message), and may map the sidelink feedback resources of the corresponding PSFCH to each interlace of the sidelink feedback resources according to an interlace mapping rule (e.g., defining which contiguous or non-contiguous PRBs the UE is to use to transmit the sidelink feedback of the received PSSCH message). The interlace of one or more PRBs on which the UE is to transmit the sidelink feedback according to the interlace mapping rule may be referred to as an initial interlace (e.g., a first interlace). The receiving UE may map one or more copies of the initial interlace (e.g., additional interlaces) to additional available sidelink feedback resources on the PSFCH (e.g., may copy the sidelink feedback messages and map them to additional resources on the PSFCH). For example, the receiving sidelink UE may determine that one or more PRBs in the PSFCH symbol are available based on the interlace mapping rule (e.g., in response to the received sidelink data transmission, the PSFCH symbol is not occupied by the initial sidelink feedback message in the initial interlace from the UE or any other sidelink UE), and may send one or more copies of the initial interlace in the unoccupied PRBs (e.g., a copy of the sidelink message may be sent via an additional sidelink feedback resource elsewhere in the PSFCH). If the sidelink feedback resource is occupied (e.g., if the sidelink feedback resource is occupied by the initial interlace of the UE or another UE), the UE may suppress the duplication of the sidelink feedback message. This may cause the receiving UE to send feedback signaling sufficient to satisfy the OCB condition in the PSFCH (e.g., the initial interlace, the replica interlace, or a combination thereof).

[0048] The adaptive scheme described herein can support the mapping of sidelink feedback resources for sending sidelink feedback, and then replicate the feedback message across different interlacings of the mapping so that the OCB condition is met. Multiple sending UEs can transmit sidelink data transmission on each PRB. The receiving sidelink UE can interlace the sidelink feedback corresponding to the detected sidelink data transmission to the PSFCH resource according to the interlaced mapping rule (e.g., defining which continuous or non-continuous PRBs the UE will use to send the sidelink feedback of the received PSSCH message). The receiving UE can map one or more copies (e.g., additional interlacing) of the initial interlacing of the sidelink feedback resource to the additional available interlacing of the sidelink feedback resource on the PSFCH. For example, the receiving sidelink UE can determine that one or more PRBs in the PSFCH symbol are available (e.g., in response to the received sidelink data transmission, the PSFCH resource is not occupied by the initial interlacing of the sidelink resource of the UE or any other sidelink UE), and can send one or more sidelink feedback messages in both the initial interlacing of the sidelink feedback and the unoccupied copy interlacing (e.g., unoccupied PRB). The transmission of sidelink feedback on both the initial interlace and the replica interlace of the sidelink feedback resources may result in sidelink feedback signaling that does not generate interference but also satisfies the channel occupancy threshold condition.

[0049] Aspects of the present disclosure are first described in the context of a wireless communication system. Aspects of the present disclosure are further illustrated and described with reference to a wireless communication system, a sidelink staggered feedback scheme, and a process flow. Aspects of the present disclosure are further illustrated and described by and with reference to apparatus diagrams, system diagrams, and flow diagrams related to staggered feedback of sidelink communications via unlicensed resources.

[0050] Figure 1 An example of a wireless communication system 100 that supports staggered feedback for sidelink communication via an unlicensed channel according to one or more aspects of the present disclosure is illustrated. The wireless communication system 100 may include one or more network entities 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 advanced LTE (LTE-A) network, an LTE-A Pro network, a new radio (NR) network, or a network operating according to other systems and radio technologies (including future systems and radio technologies not explicitly mentioned herein).

[0051] The network entities 105 may be dispersed throughout a geographic area to form the wireless communication system 100 and may include devices in different forms or with different capabilities. In different examples, the network entities 105 may be referred to as network elements, mobility elements, radio access network (RAN) nodes, or network equipment, etc. In some examples, the network entities 105 and the UE 115 may communicate wirelessly via one or more communication links 125 (e.g., radio frequency (RF) access links). For example, the network entity 105 may support a coverage area 110 (e.g., a geographic coverage area) over which the UE 115 and the network entity 105 may establish one or more communication links 125. The coverage area 110 may be an example of a geographic area over which the network entity 105 and the UE 115 may support signal communications according to one or more radio access technologies (RATs).

[0052] The UEs 115 may be dispersed throughout the coverage area 110 of the wireless communication system 100, and each UE 115 may be stationary or mobile, or stationary and mobile at different times. The UEs 115 may be devices in different forms or with different capabilities. Figure 1 Some example UEs 115 are illustrated in FIG. 1. The UEs 115 described herein may be capable of supporting communication with various types of devices, such as Figure 1 Communicate with other UEs 115 or network entities 105) as shown.

[0053] As described herein, a node of the wireless communication system 100 (which may be referred to as a network node or a wireless node) may be a network entity 105 (e.g., any network entity described herein), a UE 115 (e.g., any UE described herein), a network controller, an apparatus, a device, a computing system, one or more components, or another suitable processing entity configured to perform any of the techniques described herein. For example, the node may be a UE 115. As another example, the node may be a network entity 105. As another example, a first node may be configured to communicate with a second node or a third node. In one aspect of this example, the first node may be a UE 115, the second node may be a network entity 105, and the third node may be a UE 115. In another aspect of this example, the first node may be a UE 115, the second node may be a network entity 105, and the third node may be a network entity 105. In yet other aspects of this example, the first node, the second node, and the third node may be different relative to these examples. Similarly, references to UE 115, network entity 105, apparatus, device, computing system, etc. may include disclosure of UE 115, network entity 105, apparatus, device, computing system, etc. as nodes. For example, disclosure that UE 115 is configured to receive information from network entity 105 also discloses that the first node is configured to receive information from the second node.

[0054] In some examples, the network entities 105 may communicate with the core network 130, or with each other, or both. For example, the network entities 105 may communicate with the core network 130 via one or more backhaul communication links 120 (e.g., according to S1, N2, N3, or other interface protocols). In some examples, the network entities 105 may communicate with each other via the backhaul communication links 120 (e.g., according to X2, Xn, or other interface protocols) directly (e.g., directly between the network entities 105) or indirectly (e.g., via the core network 130). In some examples, the network entities 105 may communicate with each other via the midhaul communication links 162 (e.g., according to the midhaul interface protocol) or the fronthaul communication links 168 (e.g., according to the fronthaul interface protocol) or any combination thereof. The backhaul communication links 120, the midhaul communication links 162, or the fronthaul communication links 168 may be or include one or more wired links (e.g., electrical links, optical fiber links), one or more wireless links (e.g., radio links, wireless optical links), or other examples or various combinations thereof. UE 115 may communicate with core network 130 via communication link 155 .

[0055] One or more of the network entities 105 described herein may include or may be referred to as a base station 140 (e.g., a transceiver base station, a radio base station, an NR base station, an access point, a radio transceiver, a Node B, an evolved Node B (eNB), a next generation Node B, or a Gigabit Node B (any of which may be referred to as a gNB), a 5G NB, a next generation eNB (ng-eNB), a Home Node B, a Home Evolved Node B, or other suitable terms). In some examples, the network entity 105 (e.g., a base station 140) may be implemented in an aggregated (e.g., monolithic, stand-alone) base station architecture, which may be configured to utilize a protocol stack physically or logically integrated within a single network entity 105 (e.g., a single RAN node, such as a base station 140).

[0056] In some examples, the network entity 105 may be implemented in a disaggregated architecture (e.g., a disaggregated base station architecture, a disaggregated RAN architecture) that may be configured to utilize a protocol stack that is physically or logically distributed between two or more network entities 105, such as an integrated access backhaul (IAB) network, an open RAN (O-RAN) (e.g., a network configuration sponsored by the O-RAN Alliance), or a virtualized RAN (vRAN) (e.g., a cloud RAN (C-RAN)). For example, the network entity 105 may include one or more of the following: a central unit (CU) 160, a distributed unit (DU) 165, a radio unit (RU) 170, a RAN intelligent controller (RIC) 175 (e.g., a near real-time RIC (near RT RIC), a non-real-time RIC (non-RT RIC)), a service management and orchestration (SMO) 180 system, or any combination thereof. The RU 170 may also be referred to as a radio head, a smart radio head, a remote radio head (RRH), a remote radio unit (RRU), or a transmit receive point (TRP). One or more components of the network entity 105 in the decomposed RAN architecture may be co-located, or one or more components of the network entity 105 may be located in distributed locations (e.g., separate physical locations). In some examples, one or more network entities 105 of the decomposed RAN architecture may be implemented as virtual units (e.g., virtual CU (VCU), virtual DU (VDU), virtual RU (VRU)).

[0057] The functional split between CU 160, DU 165, and RU 170 is flexible and may support different functionalities, depending on which functions (e.g., network layer functions, protocol layer functions, baseband functions, RF functions, and any combination thereof) are performed at CU 160, DU 165, or RU 170. For example, a functional split of a protocol stack may be employed between CU 160 and DU 165 such that CU 160 may support one or more layers of a protocol stack and DU 165 may support one or more different layers of a protocol stack. In some examples, CU 160 may host higher protocol layer (e.g., layer 3 (L3), layer 2 (L2)) functionality and signaling (e.g., radio resource control (RRC), service data adaptation protocol (SDAP), packet data convergence protocol (PDCP)). The CU 160 may be connected to one or more DUs 165 or RUs 170, and the one or more DUs 165 or RUs 170 may host lower protocol layers, such as layer 1 (L1) (e.g., physical (PHY) layer) or L2 (e.g., radio link control (RLC) layer, medium access control (MAC) layer) functionality and signaling, and may each be at least partially controlled by the CU 160. Additionally or alternatively, a functional split of the protocol stack may be employed between the DU 165 and the RU 170, such that the DU 165 may support one or more layers of the protocol stack, and the RU 170 may support one or more different layers of the protocol stack. The DU 165 may support one or more different cells (e.g., via one or more RUs 170). In some cases, the functional split between CU 160 and DU 165 or between DU 165 and RU 170 may be within the protocol layer (e.g., some functions of the protocol layer may be performed by one of CU 160, DU 165, or RU 170, while other functions of the protocol layer are performed by a different one of CU 160, DU 165, or RU 170). CU 160 may be further functionally split into CU control plane (CU-CP) functions and CU user plane (CU-UP) functions. CU 160 may be connected to one or more DUs 165 via midhaul communication links 162 (e.g., F1, F1-c, F1-u), and DU 165 may be connected to one or more RUs 170 via fronthaul communication links 168 (e.g., open fronthaul (FH) interface). In some examples, midhaul communication link 162 or fronthaul communication link 168 may be implemented based on an interface (e.g., a channel) between layers of a protocol stack supported by respective network entities 105 that communicate via such communication links.

[0058] In some wireless communication systems (e.g., wireless communication system 100), infrastructure and spectrum resources for radio access may support wireless backhaul link capabilities to supplement wired backhaul connections, thereby providing an IAB network architecture (e.g., to core network 130). In some cases, in an IAB network, one or more network entities 105 (e.g., IAB nodes 104) may be partially controlled by each other. One or more IAB nodes 104 may be referred to as donor entities or IAB donors. One or more DUs 165 or one or more RUs 170 may be controlled in part by one or more CUs 160 associated with a donor network entity 105 (e.g., donor base station 140). One or more donor network entities 105 (e.g., IAB donors) may communicate with one or more additional network entities 105 (e.g., IAB nodes 104) via supported access and backhaul links (e.g., backhaul communication links 120). The IAB node 104 may include an IAB mobile termination (IAB-MT) controlled (e.g., scheduled) by a DU 165 of a coupled IAB donor. The IAB-MT may include an independent set of antennas for relaying communications with the UE 115, or may share the same antennas of the IAB node 104 (e.g., of the RU 170) for access via the DU 165 of the IAB node 104 (e.g., referred to as a virtual IAB-MT (vIAB-MT)). In some examples, the IAB node 104 may include a DU 165 that supports communication links with additional entities (e.g., IAB node 104, UE 115) within a relay chain or configuration (e.g., downstream) of the access network. In such cases, one or more components of the decomposed RAN architecture (e.g., one or more IAB nodes 104 or components of the IAB node 104) may be configured to operate according to the techniques described herein.

[0059] In the case where the techniques described herein are applied to the context of a decomposed RAN architecture, one or more components of the decomposed RAN architecture may be configured to support staggered feedback of sidelink communications via an unlicensed channel as described herein. For example, some operations described as being performed by a UE 115 or a network entity 105 (e.g., a base station 140) may additionally or alternatively be performed by one or more components of the decomposed RAN architecture (e.g., an IAB node 104, a DU 165, a CU 160, a RU 170, a RIC 175, a SMO 180).

[0060] UE 115 may include or may be referred to as a mobile device, a wireless device, a remote device, a handheld device or a subscriber device, or some other suitable term, where a "device" may also be referred to as a unit, a station, a terminal or a client, etc. UE 115 may also include or may be referred to as a personal electronic device, such as a cellular phone, a personal digital assistant (PDA), a tablet computer, a laptop computer, or a personal computer. In some examples, UE 115 may include or may be referred to as a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or a machine type communication (MTC) device, etc., which may be implemented in various objects such as appliances or vehicles, meters, etc.

[0061] The UE 115 described herein may be capable of communicating with various types of devices such as other UEs 115 which may sometimes act as relays, as well as network entities 105 and network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, etc. Figure 1 shown.

[0062] The UE 115 and the network entity 105 may wirelessly communicate with each other via one or more communication links 125 (e.g., access links) using resources associated with one or more carriers. The term "carrier" may refer to a set of RF spectrum resources having a defined physical layer structure to support the communication link 125. For example, a carrier for the communication link 125 may include a portion of an RF spectrum band (e.g., a bandwidth portion (BWP)) that operates according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR). Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information), control signaling for coordinating carrier operations, user data, or other signaling. The wireless communication system 100 may support communications with the UE 115 using carrier aggregation or multi-carrier operation. Depending on the carrier aggregation configuration, the UE 115 may be configured to have multiple downlink component carriers and one or more uplink component carriers. Carrier aggregation may be used for both frequency division duplex (FDD) component carriers and time division duplex (TDD) component carriers. Communication between the network entity 105 and other devices may refer to communication between these devices and any portion (e.g., entity, sub-entity) of the network entity 105. For example, the terms "send," "receive," or "communicate," when referring to the network entity 105, may refer to any portion of the network entity 105 (e.g., base station 140, CU 160, DU 165, RU 170) of the RAN that communicates with another device (e.g., directly or via one or more other network entities 105).

[0063] The signal waveform transmitted via the carrier may include multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques, such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM)). In a system using MCM techniques, a resource element may refer to a resource of one symbol period (e.g., the duration of one modulation symbol) and one subcarrier, where the symbol period and subcarrier spacing may be inversely related. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both), so that a relatively high number of resource elements (e.g., within the transmission duration) and a relatively high order modulation scheme may correspond to a relatively high communication rate. Wireless communication resources may refer to a combination of RF spectrum resources, time resources, and spatial resources (e.g., spatial layers, beams), and the use of multiple spatial resources may increase the data rate or data integrity used for communication with UE 115.

[0064] One or more numerologies for a carrier may be supported, and the numerologies may include subcarrier spacing (Δf) and cyclic prefixes. A carrier may be divided into one or more BWPs with the same or different numerologies. In some examples, a UE 115 may be configured with multiple BWPs. In some examples, a single BWP for a carrier may be active at a given time, and communications for a UE 115 may be constrained to one or more active BWPs.

[0065] The time interval for the network entity 105 or the UE 115 may be expressed as a multiple of a basic time unit, which may be, for example, a sampling period T s =1 / (Δf 最大 ·N f ) seconds, for which Δf 最大 It can represent the supported subcarrier spacing, and N f The supported discrete Fourier transform (DFT) size may be indicated. The time intervals of the communication resources may be organized according to radio frames, each radio frame having a specified duration (e.g., 10 milliseconds (ms)). Each radio frame may be identified by a system frame number (SFN) (e.g., ranging from 0 to 1023).

[0066] 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, the frame may be divided into subframes (e.g., in the time domain), and each subframe may be further divided into a certain number of 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 a certain number of symbol periods (e.g., depending on the length of the cyclic prefix added before each symbol period). In some wireless communication systems 100, the time slot may also be divided into multiple mini-time slots associated with one or more symbols. Excluding the cyclic prefix, each symbol period may be associated with one or more (e.g., N f The duration of a symbol period may depend on the subcarrier spacing or the operating frequency band.

[0067] A subframe, a time slot, a mini-time slot, or a symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communication system 100 and may be referred to as a transmission time interval (TTI). In some examples, the TTI duration (e.g., the number of symbol periods in a TTI) may be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communication system 100 may be dynamically selected (e.g., in a burst of a shortened TTI (sTTI)).

[0068] Physical channels may be multiplexed using carriers for communication according to various techniques. For example, physical control channels and physical data channels may be multiplexed using one or more of a time division multiplexing (TDM) technique, a frequency division multiplexing (FDM) technique, or a hybrid TDM-FDM technique to signal via a downlink carrier. A control region (e.g., a control resource set (CORESET)) of a physical control channel may be defined by a set of symbol periods and may extend across a system bandwidth or a subset of a system bandwidth of a carrier. One or more control regions (e.g., CORESETs) may be configured for a set of UEs 115. For example, one or more UEs in UE115 may monitor or search a control region for control information according to one or more search space sets, and each search space set may include one or more control channel candidates in one or more aggregation levels arranged in a cascaded manner. The aggregation level of a control channel candidate may refer to the amount of control channel resources (e.g., control channel elements (CCEs)) associated with coded information for a control information format having a given payload size. The search space sets may include a common search space set configured for transmitting control information to a plurality of UEs 115 , and a UE-specific search space set for transmitting control information to a specific UE 115 .

[0069] In some examples, the network entities 105 (e.g., base stations 140, RUs 170) may be mobile and thus provide communication coverage for mobile coverage areas 110. In some examples, different coverage areas 110 associated with different technologies may overlap, but the different coverage areas 110 may be supported by the same network entity 105. In some other examples, overlapping coverage areas 110 associated with different technologies may be supported by different network entities 105. The wireless communication system 100 may include, for example, a heterogeneous network in which different types of network entities 105 provide coverage for various coverage areas 110 using the same or different radio access technologies.

[0070] Some UEs 115, such as MTC or IoT devices, may be low-cost or low-complexity devices and may provide automated communication between machines (e.g., via machine-to-machine (M2M) communication). M2M communication or MTC may refer to data communication technology that allows devices to communicate with each other or with a network entity 105 (e.g., base station 140) without human intervention. In some examples, M2M communication or MTC may include communication from devices with integrated sensors or meters to measure or capture information and relay such information to a central server or application that uses the information or presents the information to a person interacting with the application. Some UEs 115 may be designed to collect information or implement 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 business charging.

[0071] Some UEs 115 may be configured to employ a reduced power consumption mode of operation, such as half-duplex communication (e.g., a mode that supports unidirectional communication via transmission or reception but does not transmit and receive concurrently). In some examples, half-duplex communication may be performed at a reduced peak rate. Other power saving techniques for UE 115 include entering a power saving deep sleep mode when not engaged in active communications, operating using limited bandwidth (e.g., according to narrowband communications), or a combination of these techniques. For example, some UEs 115 may be configured to operate using a narrowband protocol type that is associated with a defined portion or range (e.g., a set of subcarriers or resource blocks (RBs)) within a carrier, within a guard band of a carrier, or outside a carrier.

[0072] The wireless communication system 100 may be configured to support ultra-reliable communication or low-latency communication or various combinations thereof. For example, the wireless communication system 100 may be configured to support ultra-reliable low-latency communication (URLLC). UE 115 may be designed to support ultra-reliable, low-latency or critical functions. Ultra-reliable communication may include private communication or group communication, and may be supported by one or more services (such as push-to-talk, video or data). Support for ultra-reliable, low-latency functions may include prioritization of services, and such services may be used for public safety or general commercial applications. The terms ultra-reliable, low-latency and ultra-reliable low-latency may be used interchangeably herein.

[0073] In some examples, the UE 115 may be configured to support communication directly with other UEs 115 via a device-to-device (D2D) communication link 135 (e.g., according to a peer-to-peer (P2P), D2D, or sidelink protocol). In some examples, one or more UEs 115 in a group that are performing D2D communication may be within a coverage area 110 of a network entity 105 (e.g., a base station 140, a RU 170), which may support aspects of such D2D communication configured (e.g., scheduled) by the network entity 105. In some examples, one or more UEs 115 in such a group may be outside of the coverage area 110 of the network entity 105, or may otherwise be unable or not configured to receive transmissions from the network entity 105. In some examples, a group of UEs 115 communicating via D2D communication may support a one-to-many (1:M) system in which each UE 115 transmits to each of the other UEs 115 in the group. In some examples, network entity 105 may facilitate scheduling of resources for D2D communications. In some other examples, D2D communications may be performed between UEs 115 without involving network entity 105.

[0074] In some systems, the D2D communication link 135 can be an example of a communication channel such as a sidelink communication channel between vehicles (e.g., UE 115). In some examples, the vehicles can communicate using vehicle-to-everything (V2X) communication, vehicle-to-vehicle (V2V) communication, or some combination of these items. The vehicles can signal information related to traffic conditions, signal scheduling, weather, safety, emergency situations, or any other information related to the V2X system. In some examples, vehicles in the V2X system can communicate with roadside infrastructure such as roadside units using vehicle-to-network (V2N) communication, or communicate with the network via one or more network nodes (e.g., network entity 105, base station 140, RU 170), or both.

[0075] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 may 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), an access and mobility management function (AMF)) for managing access and mobility and at least one user plane entity (e.g., a serving gateway (S-GW), a packet data network (PDN) gateway (P-GW), or a user plane function (UPF)) for routing packets or interconnecting to an external network. The control plane entity may manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management of UE 115 served by a network entity 105 (e.g., a base station 140) associated with the core network 130. User IP packets may be delivered through a user plane entity, which may provide IP address allocation and other functions. The user plane entity may be connected to an IP service 150 for one or more network operators. IP services 150 may include access to the Internet, an intranet, an IP Multimedia Subsystem (IMS), or packet-switched streaming services.

[0076] The wireless communication system 100 may operate using one or more frequency bands that may be in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). Generally speaking, the region of 300 MHz to 3 GHz is referred to as the ultra-high frequency (UHF) region or decimeter band because the wavelength range is approximately one decimeter to one meter. UHF waves may be blocked or redirected by buildings and environmental features (which may be referred to as clusters), but these waves may be sufficient to penetrate structures so that macro cells provide services to UEs 115 located indoors. Communications using UHF waves may be associated with smaller antennas and shorter ranges (e.g., less than 100 kilometers) than communications using the lower frequencies and longer wavelengths of the high frequency (HF) or very high frequency (VHF) portions of the spectrum below 300 MHz.

[0077] The wireless communication system 100 may also operate using a super high frequency (SHF) region, which may be in the range of 3 GHz to 30 GHz, also referred to as a centimeter band, or an extremely high frequency (EHF) region (e.g., from 30 GHz to 300 GHz) of the spectrum, also referred to as a millimeter band. In some examples, the wireless communication system 100 may support millimeter wave (mmW) communications between a UE 115 and a network entity 105 (e.g., a base station 140, a RU 170), and the EHF antenna of the corresponding device may be smaller and closer than the UHF antenna. In some examples, such technology may facilitate the use of antenna arrays within the device. However, the propagation of EHF transmissions may be affected by greater attenuation and a shorter range than SHF or UHF transmissions. The technology disclosed herein may be adopted across transmissions using one or more different frequency zones, and the use of frequency bands specified across these frequency zones may vary by country or regulatory agency.

[0078] The wireless communication system 100 may utilize both licensed RF spectrum bands and unlicensed RF spectrum bands. For example, the wireless communication system 100 may employ license assisted access (LAA), LTE unlicensed (LTE-U) radio access technology, or NR technology using unlicensed bands (such as the 5 GHz industrial, scientific, and medical (ISM) band). When operating using unlicensed RF spectrum bands, devices such as network entities 105 and UE 115 may employ carrier sensing for conflict detection and avoidance. In some examples, operations using unlicensed bands may be based on a carrier aggregation configuration combined with component carriers operating using licensed bands (e.g., LAA). Operations using unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, and the like.

[0079] The network entity 105 (e.g., base station 140, RU 170) 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) communications, or beamforming. The antennas of the network entity 105 or UE 115 may be located within one or more antenna arrays or antenna panels that can support MIMO operations or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly (such as an antenna tower). In some examples, antennas or antenna arrays associated with the network entity 105 may be located at different geographical locations. The network entity 105 may include an antenna array having a set of rows and columns of antenna ports that the network entity 105 can use to support beamforming for communications with the UE 115. Similarly, the UE 115 may include one or more antenna arrays that can support various MIMO or beamforming operations. Additionally or alternatively, the antenna panel may support RF beamforming for signals sent via the antenna ports.

[0080] The network entity 105 or the UE 115 may use MIMO communication to utilize multipath signal propagation and improve spectral efficiency by sending or receiving multiple signals via different spatial layers. Such techniques may be referred to as spatial multiplexing. For example, multiple signals may be sent by a transmitting device via different antennas or different combinations of antennas. Similarly, multiple signals may be received by a receiving device via different antennas or different combinations of antennas. Each of the multiple signals may be referred to as a separate spatial stream and may carry information associated with the same data stream (e.g., the same codeword) or different data streams (e.g., different codewords). Different spatial layers may be associated with different antenna ports for channel measurement and reporting. MIMO techniques include single-user MIMO (SU-MIMO), for which multiple spatial layers are sent to the same receiving device; and multi-user MIMO (MU-MIMO), for which multiple spatial layers are sent to multiple devices.

[0081] Beamforming (which may also be referred to as spatial filtering, directional transmission, or directional reception) is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a network entity 105, a UE 115) to shape or direct an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by combining signals conveyed via antenna elements of an antenna array so that some signals propagating along a particular direction relative to the antenna array experience constructive interference, while other signals experience destructive interference. Adjustments to signals conveyed via antenna elements may include the transmitting device or the receiving device applying an amplitude offset, a phase offset, or both to signals carried via antenna elements associated with the device. Adjustments associated with each of these antenna elements may be defined by a set of beamforming weights associated with a particular direction (e.g., relative to the antenna array of the transmitting device or the receiving device or relative to some other direction).

[0082] The network entity 105 or UE 115 may use beam scanning techniques as part of a beamforming operation. For example, the network entity 105 (e.g., base station 140, RU 170) 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 sent multiple times by the network entity 105 along different directions. For example, the network entity 105 may send signals according to different sets of beamforming weights associated with different transmission directions. Transmission along different beam directions may be used to identify (e.g., by a transmitting device (such as network entity 105), or by a receiving device (such as UE 115)) the beam direction for later transmission or reception by the network entity 105.

[0083] Some signals (such as data signals associated with a particular receiving device) may be sent by a transmitting device (e.g., transmitting network entity 105, transmitting UE 115) along a single beam direction (e.g., a direction associated with a receiving device such as receiving network entity 105 or receiving UE 115). In some examples, a beam direction associated with transmission along a single beam direction may be determined based on signals sent along one or more beam directions. For example, UE 115 may receive one or more of the signals sent by network entity 105 along different directions, and may report to network entity 105 an indication of the signal received by UE 115 with the highest signal quality or other acceptable signal quality.

[0084] In some examples, transmission by a device (e.g., by network entity 105 or UE 115) may be performed using multiple beam directions, and the device may use a combination of digital precoding or beamforming to generate a combined beam for transmission (e.g., from network entity 105 to UE 115). UE 115 may report feedback indicating precoding weights for one or more beam directions, and the feedback may correspond to a configured beam set across a system bandwidth or one or more subbands. Network entity 105 may send a reference signal (e.g., a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS)), which may be precoded or not precoded. UE 115 may provide feedback for beam selection, which may be a precoding matrix indicator (PMI) or codebook-based feedback (e.g., a multi-faceted codebook, a linear combination codebook, a port selection codebook). Although these techniques are described with reference to signals sent along one or more directions by a network entity 105 (e.g., base station 140, RU 170), UE 115 may use similar techniques to send signals multiple times along different directions (e.g., to identify a beam direction for subsequent transmission or reception by UE 115), or to send signals along a single direction (e.g., to send data to a receiving device).

[0085] A receiving device (e.g., UE 115) may perform receiving operations according to 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 a receiving device (e.g., network entity 105). For example, the receiving device may perform reception according to multiple receiving directions by: receiving via different antenna subarrays, processing the received signals according to different antenna subarrays, receiving according to different receiving beamforming weight sets (e.g., different directional listening weight sets) applied to signals received at multiple antenna elements of an antenna array, or processing the received signals according to different receiving beamforming weight sets applied to signals received at multiple antenna elements of an antenna array, any of which may 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 a data signal). A single receive configuration may be aligned along a beam direction determined based on listening according to different receive 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).

[0086] The wireless communication system 100 may be a packet-based network that operates according to a layered protocol stack. In the user plane, communications at the bearer or PDCP layer may be IP-based. The RLC layer may perform packet segmentation and reassembly to communicate via logical channels. The MAC layer may perform priority processing and multiplexing of logical channels to transport channels. The MAC layer may also implement error detection techniques, error correction techniques, or both to support retransmission to improve link efficiency. In the control plane, the RRC layer may provide the establishment, configuration, and maintenance of an RRC connection that supports a radio bearer for user plane data between the UE 115 and the network entity 105 or the core network 130. The PHY layer may map a transport channel to a physical channel.

[0087] UE 115 and network entity 105 may support retransmission of data to increase the likelihood of data being successfully received. Hybrid automatic repeat request (HARQ) feedback is a technique for increasing the likelihood of correctly receiving data via a communication link (e.g., communication link 125, D2D communication link 135). HARQ may include a combination of error detection (e.g., using a cyclic redundancy check (CRC)), forward error correction (FEC), and retransmission (e.g., automatic repeat request (ARQ)). HARQ may improve throughput at the MAC layer under poor radio conditions (e.g., low signal-to-noise ratio conditions). In some examples, a device may support same-slot HARQ feedback, in which case the device may provide HARQ feedback in a specific slot for data received via a previous symbol in the slot. In some other examples, the device may provide HARQ feedback in a subsequent slot or according to some other time interval.

[0088] Multiple transmitting UEs 115 may transmit sidelink data transmissions on respective PRBs. The receiving sidelink UE 115 may interlace the sidelink feedback corresponding to the detected sidelink data transmission to the PSFCH resource according to an interlace mapping rule (e.g., defining which contiguous or non-contiguous PRBs the UE 115 will use to transmit the sidelink feedback of the received PSSCH message). The receiving UE 115 may map one or more copies (e.g., additional interlaces) of the initial interlace of the sidelink feedback resource to the additional available interlace of the sidelink feedback resource on the PSFCH. For example, the receiving sidelink UE 115 may determine that one or more PRBs in the PSFCH symbol are available (e.g., in response to the received sidelink data transmission, the PSFCH resource is not occupied by the initial interlace of the sidelink resource of the UE 115 or any other sidelink UE), and may send one or more sidelink feedback messages in both the initial interlace of the sidelink feedback and the unoccupied copy interlace (e.g., unoccupied PRBs). The transmission of sidelink feedback on both the initial interlace and the replica interlace of the sidelink feedback resources may result in sidelink feedback signaling that does not generate interference but also satisfies the channel occupancy threshold condition.

[0089] Figure 2 An example of a wireless communication system 200 that supports interleaved feedback for sidelink communications via an unlicensed channel in accordance with one or more aspects of the present disclosure is illustrated. The wireless communication system 200 may implement aspects of the wireless communication system 100 or be implemented by aspects of the wireless communication system. For example, the wireless communication system 200 may include one or more UEs 115 (e.g., UE 115-a, UE 115-b, and UE 115-c) and one or more network entities (e.g., network entity 105), which may be reference Figure 1 Examples of the corresponding devices described.

[0090] UE 115-a, UE 115-b, and UE 115-c may use one or more sidelink channels to perform sidelink communications with each other. For example, one or more transmitting UEs 115 (e.g., UE 115-a, UE 115-b, or both) may use one or more PSSCHs (e.g., PSSCH 0 and PSSCH 1) to send sidelink data to one or more receiving UEs 115 (e.g., UE 115-c). UE 115-c may receive a unicast sidelink message, a multicast sidelink message, or any combination thereof. The sidelink message may correspond to a feedback symbol (e.g., PSFCH symbol 215) on which the receiving UE 115-c is to send sidelink feedback for the received sidelink message.

[0091] Feedback symbols (e.g., PSFCH symbols 215) may be multiplexed in the frequency domain, the code domain, or both. For example, the feedback symbols may be divided into frequency resources (e.g., one set of frequency resources (such as one PRB) per feedback message (such as an ACK or NACK message)). Sidelink feedback may also be multiplexed using code resources. For example, the number of cyclic shift (CS) pairs of a base sequence in each PRB of the feedback symbol (e.g., up to six CS pairs, where one CS of each CS pair corresponds to an ACK message and one CS of each CS pair corresponds to a NACK message).

[0092] The receiving UE 115-c may perform PSFCH resource mapping according to a mapping rule (e.g., an implicit mapping rule). Multiple resources (e.g., multiple PRBs, such as four PRBs) may be allocated per subchannel (e.g., of channel 205) and per time slot based on the sidelink resources sent by the PSSCH (e.g., on PSSCH 0 or PSSCH 1). The PSFCH resources of the HARQ feedback of the received sidelink message 220 may be mapped with a combined PRB (e.g., in the frequency domain) and CS pair (e.g., in the code domain). For example, a PRB group 210-a (e.g., four PRBs in a PSFCH symbol 215, which may be referred to as PRB 0, PRB 1, PRB 2, and PRB 3 in ascending order of frequency) may be allocated for sidelink feedback signaling corresponding to any sidelink signaling received in subchannel 0 (e.g., of channel 205) during time slot 0. Similarly, PRB group 210-b may be allocated for sidelink feedback signaling corresponding to any sidelink signaling received in subchannel 0 and time slot 1, PRB group 210-c may be allocated for sidelink feedback signaling corresponding to any sidelink signaling received in subchannel 1 and time slot 0, PRB group 210-d may be allocated for sidelink feedback signaling corresponding to any sidelink signaling received in subchannel 1 and time slot 1, PRB group 210-e may be allocated for sidelink feedback signaling corresponding to any sidelink signaling received in subchannel 2 and time slot 0, and PRB group 210-f may be allocated for sidelink feedback signaling corresponding to any sidelink signaling received in subchannel 2 and time slot 1. Thus, the receiving UE 115-c may determine in which feedback resources (e.g., in PSFCH symbols 215) to send sidelink feedback based on the resources via which the sidelink message 220 is received based on the mapping rule.

[0093] UE 115-c may receive side link message 220-a via PSSCH 0 (e.g., from first transmitting UE 115-a) and may receive side link message 220-b via PSSCH 1 (e.g., from second transmitting UE 115-b). Side link message 220-a may be associated with an identifier for transmitting UE 115-a (e.g., ID is 0) and side link message 220-b may be associated with an identifier for transmitting UE 115-b (e.g., ID is 1).

[0094] The receiving UE 115-c may perform PSFCH resource mapping according to the mapping rule and based on the received unicast sidelink message 220 according to Equation 1:

[0095] Equation 1: PSFCH resource = ID L1-源 mod(y×x)

[0096] Where y=the number of PRBs and x=the number of CS pairs. For x=1 CS and y=4 PRBs in each PRB group 210, y·x=4·1=4 resources are used to send the sidelink feedback message. For example, UE 115-c may receive sidelink message 220-a during time slot 0, which may be a unicast message received via at least a portion of subchannel 1 and subchannel 2 (e.g., sidelink resources corresponding to sidelink feedback resources of PRB group 210-c and PRB group 210-e, respectively). In such an example, the UE may perform PSFCH mapping according to Equation 1 as follows: ID L1-源 mod(y·x)=ID L1-源 (0) mod (4) = 0, where ID L1-源Refers to the layer 1 source ID of the unicast sidelink message 220-a (e.g., the layer 1 ID of the transmitting UE 115-a is 0). In such an example, UE 115-c can map the feedback message (e.g., ACK or NACK) of the sidelink message 220-a to PRB 0 of PRB group 210-c. Because the sidelink message 220-a spans at least a portion of subchannel 1 and subchannel 2, UE 115-c can also map the feedback message to PRB 0 of PRB group 210-e. However, because the sidelink message 220-a is a unicast message of UE 115-c, and because UE 115-c can send the feedback message in PRB 0 of PRB group 210-c, the second feedback message in PRB 0 of PRB group 210-e can be redundant. In such an example, UE 115-c may send feedback messages for sidelink message 220-a in only one PRB group (e.g., in PRB 0 of PRB group 210-c) and may refrain from sending duplicate feedback messages in PRB 0 of PRB group 210-e. The transmitting UE 115-a may monitor feedback messages for sidelink message 220-a in a PRB group (e.g., PRB 0 of PRB group 210-c) based on the mapping.

[0097] In some examples, the sidelink message 220-a may be a multicast message addressed to a set of UEs 115 (e.g., including UE 115-c). The multicast message may be a first type of multicast (e.g., which may be referred to as a multicast type 1, or a NACK-only multicast). In such examples, each of the multiple receiving UEs 115 may not send ACK feedback after successfully receiving the sidelink message 220-a, but may send a NACK message in the event of a reception or decoding failure. If the transmitting UE 115 (e.g., UE 115-a) receives one or more NACK messages from any of the receiving UEs 115, UE 115-a may resend the sidelink message 220-a. UE 115 may map feedback signaling (e.g., a NACK message) to a single feedback resource (e.g., a single PRB) as follows: ID TX mod(y×x)=ID TX (0) mod (4) = 0, where ID TXRefers to the ID of the transmitting UE 115-a (e.g., the layer 1 ID of the transmitting UE 115-a is 0). In such an example, UE 115-c (e.g., and any other receiving UE 115) may map the sidelink NACK message to PRB 0 of PRB group 210-c (e.g., and may refrain from sending the sidelink NACK message during PRB 0 of PRB group 210-e). The transmitting UE 115-a may monitor the feedback message of the sidelink message 220-a in the PRB group (e.g., PRB 0 of PRB group 210-c) based on the mapping.

[0098] In some examples, UE 115-c may receive sidelink message 220-b, which may be a second type of multicast message (e.g., which may be referred to as a type 2 multicast message). For example, sidelink message 220-b may be multicast to multiple (e.g., 6) UEs 115 within a group having unique receiver UE identifiers (e.g., member ID “0”, member ID “1”, member ID “2”, member ID “3”, member ID “4”, and member ID “5”), where UE 115-c may be associated with, for example, member ID “2”. UE 115-c and other receiving UEs 115 may perform PSFCH resource mapping according to Equation 2:

[0099] Equation 2: PSFCH resource = (ID TX +M_ID RX )mod(y×x)

[0100] Where ID TX may refer to the ID of the transmitting UE 115-b (e.g., layer 1 ID is 1), and M_ID RX d. In such an example, each of the receiving UEs 115 may perform PSFCH resource mapping as follows: (ID 2) may refer to the member ID of the receiving UE 115-c within the group (e.g., the member ID is 2). Because the sidelink message 220-b spans both subchannel 0 and subchannel 1 in time slot 1, the receiving UE 115 may map the sidelink feedback to one of the PRB group 210-b and the PRB group 210-d. TX +M_ID RX )mod(y×x)=(ID TX (1)+M_ID RX )mod(4)=PRBs 1, 2, and 3 in PRB group 210-b and PRBs 0, 1, and 2 in PRB group 210-d (e.g., based on six receiver member IDs with IDs 0, 1, 2, 3, 4, and 5). Thus, UE 115-c with member ID “2” can receive PRBs 1, 2, and 3 in PRB group 210-b and PRBs 0, 1, and 2 in PRB group 210-d according to (ID TX (1)+M_ID RX(2))mod(4)=PRB 3 of PRB group 210-b performs PSFCH resource mapping, and the feedback message can be sent in PRB 3 of PRB group 210-b. The other five receiving UEs 115 can similarly map the feedback signaling to the corresponding PRBs. The sending UE 115-b can monitor the feedback messages from all receiving UEs (member UEs) in the group based on the mapping for the side link message 220-b in the PRB group (e.g., PRB 1-PRB 3 of PRB group 210-b and PRB 0-PRB 2 of PRB group 210-d). Such mapping can assume one CS and can be adjusted for more CS pairs according to Equations 1 and 2.

[0101] In some examples, UE 115 may use unlicensed resources (e.g., channel 205 may be an LBT channel or LBT subchannel for accessing an unlicensed channel) to perform sidelink communications as described herein. In some examples, the communicating UE 115 may be subject to an OCB condition. In such examples, the wireless communication system may command or support communications in which the OCB will be less than the declared nominal channel bandwidth for all transmissions (e.g., including data transmissions and feedback transmissions). If UE 115 does not support a transmission mode that satisfies a bandwidth of at least a threshold amount (e.g., seventy percent) of the declared nominal channel bandwidth, they may not be allowed to perform communications. In such examples, UE 115 may not be able to support sidelink communications and sidelink feedback signaling unless such sidelink signaling satisfies a threshold OCB condition. To meet the OCB condition, feedback signaling (e.g., HARQ ACK and HARQ NACK messages) from one or more receiving UEs 115 during a given PSFCH symbol 215 within an LBT subchannel (e.g., channel 205) may need to occupy at least a threshold amount (e.g., seventy percent) of the LBT subchannel (e.g., a 20 MHz subchannel).

[0102] As at least reference Figure 2As described, the number of feedback transmissions in the PSFCH symbol 215 of the channel 205 may vary dynamically based on the number of PSSCH transmissions associated with the PSFCH symbol 215, the number of transmission resources per PSSCH transmission, the type of transmission of the sidelink transmission (e.g., unicast, multicast type 1, multicast type 2, etc.), or any combination thereof. For example, the sidelink feedback of a unicast sidelink message or a multicast type 1 sidelink message may be mapped to a single PRB, while the sidelink feedback of a multicast type 2 sidelink message may be mapped to multiple PRBs of multiple UEs 115. Therefore, if only a few sidelink messages 220 are scheduled on the sidelink resources, or if the scheduled sidelink messages are primarily unicast or multicast type 1 transmissions, the feedback signaling via the PSFCH symbol 215 may not satisfy the OCB condition. In such examples, the UE 115 or the wireless communication system 200 may not support the feedback signaling, resulting in reduced reliability of the sidelink communication, increased latency, increased system delay, less efficient use of available unlicensed resources, and reduced user experience.

[0103] A fixed interleaving pattern may not be effective for the receiving UE 115 to perform PSFCH resource mapping and satisfy the OCB condition while avoiding mutual interference. For example, if only a single HARQ feedback message is sent during a PSFCH symbol in an LBT subchannel, an interleaving pattern with fewer interleaving resources or fewer resource interleavings may not result in a sufficient number of available feedback resources to satisfy the OCB condition. In some examples, if too many HARQ feedback messages are sent at PSFCH symbols 215 within an LBT subchannel, selecting an interleaving pattern with more interleavings and more resources available for resource interleaving may result in overlapping transmissions, and increased interference between PSFCH transmissions.

[0104] The technology described in this article supports an adaptive interleaving scheme for receiving UE transmit side link feedback and satisfying OCB conditions without mutual interference. Figures 3 to 7 As described in more detail, each receiving UE 115 may detect any sidelink message 220 transmitted on a given channel 205 (e.g., an LBT subchannel). For example, the transmitting UE may receive configuration information (e.g., sidelink unlicensed configuration information) including parameters for a first or initial interlace (e.g., one or more consecutive or non-consecutive PRBs on a PSFCH symbol 215) and one or more copies of the first interlace (e.g., additional interlaces). The transmitting UE 115-a may transmit one or more sidelink messages and may determine an allocation of a first interlace within the PSFCH symbol 215. The UE 115-a may monitor the first interlace for feedback information associated with the sidelink message based on an interlace mapping rule.

[0105] The receiving UE 115-c may receive configuration information (e.g., sidelink unlicensed configuration information) that includes parameters for a first or initial interlace and one or more copies of the first interlace (e.g., additional interlaces). For example, the first interlace may include one or more contiguous or non-contiguous PRBs on which sidelink feedback for a sidelink message received in a given set of time and frequency resources (e.g., subchannels or PRBs and time slots) is transmitted. The configuration information may also indicate an offset or replication distance that indicates the number of frequency resources (e.g., subchannels or PRBs or interleaved resource blocks (IRBs)) at which the UE may map a copy of the first interlace for transmission of sidelink feedback. The receiving UE 115-c may determine an allocation for the first interlace (e.g., one or more contiguous or non-contiguous PRBs based on a preconfiguration or configuration) via the PSFCH symbol 215 for each detected sidelink transmission based on the interlace mapping rule. The UE 115-c may also determine an allocation of one or more copies of a first interlace associated with a sidelink transmission of the UE 115-c based on a replication distance (e.g., configured in configuration information or preconfigured). For example, the UE 115-c may determine an allocation of each first interlace for each detected sidelink message 220 (e.g., whether the detected sidelink message 220 is addressed to the UE 115-c). For each sidelink message 220 addressed to the UE 115-c, the UE 115-c may determine an allocated first interlace (e.g., a PRB on which sidelink feedback for the received sidelink message 220 is transmitted) and one or more copies of the first interlace.

[0106] UE 115-c may then determine one or more allocated replica interleavings of the first interleaving. If the replica interleaving of the first interleaving does not overlap with the initial interleaving of another side link message addressed to any UE 115 (e.g., the first interleaving of UE 115-c or other UE 115), UE 115-c may also send the feedback message in the replica interleaving. However, if the resources of the replica interleaving will be occupied by the initial interleaving of another side link message addressed to any UE 115 (e.g., as determined by UE 115-c based on mapping and detecting all side link transmissions on the LBT subchannel), UE 115-c may suppress sending the side link feedback message via the replica interleaving. UE 115-c may then send the first interleaving and one or more replicas (e.g., additional interleavings) interleaved in PSFCH symbol 215. The combination of the initial interleaving of the feedback signaling and the replica interleaving of the unoccupied resources may result in feedback signaling via PSFCH symbol 215 that satisfies the OCB condition. As described herein, the techniques described with reference to subchannel 0, subchannel 1, and subchannel 2 may be similarly performed for any set of frequency resources (eg, PRBs, channels, etc.).

[0107] Figure 3 An example of a sidelink interleaved feedback scheme 300 that supports interleaved feedback of sidelink communications via an unlicensed channel according to one or more aspects of the present disclosure is illustrated. The sidelink interleaved feedback scheme 300 may implement or be implemented by aspects of the wireless communication system 100 and the wireless communication system 200. For example, it may be referenced Figure 1 to Figure 2 One or more UEs (e.g., UE 115) and one or more network entities (e.g., network entity 105) of the example of the corresponding device described may perform wireless communication according to the sidelink staggered feedback scheme 300. The UE may communicate sidelink data during one or more PSSCHs (e.g., PSSCH 0 and PSSCH 1) associated with a feedback symbol (e.g., PSFCH symbol 315). The PSFCH symbol 315 may be allocated per time resource set (e.g., every 1, 2, or 4 time slots) within a resource pool based on preconfiguration or configuration. The UE may communicate with each other using an unlicensed spectrum such as an LBT subchannel 305 in one or more time resources (e.g., time slot 0 and time slot 1) and one or more frequency resources (e.g., frequency resource set 0, frequency resource set 1, and frequency resource set 2, which may be an example of a subchannel or PRB or interleaved resource block (IRB) of the LBT subchannel 305).

[0108] In order to meet the reference Figure 2The OCB requirement described herein may be that one or more UEs may perform an adaptive interleaving scheme for mapping and transmitting HARQ feedback via a first (e.g., initial) interleaving of sidelink feedback and one or more copies of the first interleaving (e.g., additional interleaving) based on a sidelink transmission (e.g., a PSSCH transmission sharing a common PSFCH symbol 315) and a corresponding broadcast type of the sidelink transmission. For example, one or two transmitting UEs may transmit a first sidelink message via PSSCH 0, respectively, and a second sidelink message via PSSCH 1. The receiving UE may detect both of the sidelink messages in the corresponding PSSCH of the shared PSFCH symbol 315. The receiving UE may determine the allocation of the first interleaving for each detected sidelink message. Each interleaving or interleaving copy may include a plurality of PRBs (e.g., a plurality of (e.g., z) consecutive PRBs 320-b or non-consecutive PRBs 320-a) based on a preconfiguration or configuration. Based on the preconfiguration or configuration, each PRB in each interleaving may have the same CS or a different CS. For example, the receiving UE may determine the allocation of interlaces 310-b for sidelink messages detected via PSSCH 0 and interlaces 310-a for sidelink messages detected via PSSCH 1. The first interlace 310-a of the sidelink message detected in PSSCH 1 may carry feedback signaling (e.g., HARQ ACK or HARQ NACK) via PSFCH symbols 315 based on the interlace mapping rule. The first (e.g., initial) interlace 310-b of the sidelink message detected in PSSCH 0 may carry feedback signaling (e.g., HARQ ACK or HARQ NACK) via PSFCH symbols 315 based on the interlace mapping rule.

[0109] The receiving UE may further determine the allocation of one or more copies of the first (e.g., initial) interlacing associated with the detected message addressed to the receiving UE. The receiving UE may determine the allocation for each interlaced copy 325 based on an offset of a replication distance (e.g., preconfigured or configured in configuration information, etc.). If the message detected via PSSCH 1 is addressed to the receiving UE, the receiving UE may determine that interlaced copy 325-a and interlaced copy 325-c are allocated for the copy of the first interlacing 310-a. If the message detected via PSSCH 0 is addressed to the receiving UE, the receiving UE may further determine that interlaced copy 325-b is allocated for the copy of the first interlacing 310-b. The receiving UE may send sidelink feedback of a sidelink message received via PSSCH 1 via interlacing 310-a and via interlaced copy 325-a and interlaced copy 325-c. Similarly, the receiving UE may send sidelink feedback of a sidelink message received via PSSCH 0 via the first interlace 310-b and via the interlace replica 325-b. By doing so, the receiving UE may send feedback signaling via the PSFCH symbol 315 that satisfies the OCB condition of the LBT subchannel 305.

[0110] One or two transmitting UEs may determine corresponding allocations for the first interlace 310 - a and the first interlace 310 - b based on the interlace mapping rule, and may monitor the first interlace 310 - a and the first interlace 310 - b , respectively, according to the determined allocations.

[0111] Figure 4 An example of a sidelink interleaving feedback scheme 400 that supports interleaving feedback of sidelink communications via an unlicensed channel according to one or more aspects of the present disclosure is illustrated. The sidelink interleaving feedback scheme 400 may implement or be implemented by aspects of the wireless communication system 100 and the wireless communication system 200 and the sidelink interleaving feedback scheme 300. For example, it may be reference Figures 1 to 3One or more UEs (e.g., UE 115) and one or more network entities (e.g., network entity 105) of the example of the corresponding device described may perform wireless communication according to the sidelink staggered feedback scheme 400. The UE may communicate sidelink data during one or more PSSCHs (e.g., PSSCH 0, PSSCH 1, PSSCH 2, and PSSCH 3) associated with a feedback symbol (e.g., PSFCH symbol 415). The PSFCH symbol 415 may be allocated per time resource set (e.g., every 1, 2, or 4 time slots) within a resource pool based on preconfiguration or configuration. The UE may communicate with each other using an unlicensed spectrum such as an LBT subchannel 405 in one or more time resources (e.g., time slot 0, time slot 1, time slot 2, and time slot 3) and one or more frequency resources (e.g., a frequency resource set such as a subchannel or interleaved resource block (IRB) IRB 0, IRB 1, and IRB 2, or any other subset of frequency resources such as a subchannel of an LBT subchannel 405). In some examples, an IRB may be located within a subchannel (eg, subchannel 0). For example, a subchannel may contain one or more IRBs.

[0112] In some examples, the receiving UE can allocate a first (e.g., initial) interlace associated with a sidelink transmission detected on the PSSCH of the shared PSFCH symbol 415 based on PSSCH transmission resources in frequency (e.g., subchannel or IRB) and in time (e.g., time slot) and different broadcast types based on an interlace mapping rule. For example, the UE can perform PSFCH resource mapping according to a mapping rule for one or more interlace groups 410 (e.g., each interlace group includes multiple interlaces, such as 4 interlaces). As shown in reference Figure 3Described in more detail, each interlace may include one or more PRBs or IRBs, and based on preconfiguration or configuration, multiple PRBs or IRBs in an interlace may be continuous or non-contiguous and may be associated with the same CS pair or different CS pairs. Each interlace group 410 may be mapped per frequency (e.g., subchannel or IRB) and per time (e.g., time slot) according to an interlace mapping rule. For example, interlace group 410-a may be mapped to PSSCH 0 located in subchannel or IRB 0 and time slot 0, interlace group 410-b may be mapped to PSSCH located in subchannel or IRB 0 and time slot 1, IRB group 410-c may be mapped to PSSCH 2 in subchannel or IRB 0 and time slot 2, and interlace group 410-d may be mapped to PSSCH 3 in subchannel or IRB 0 and time slot 3. Similarly, interlace group 410-e may be mapped to PSSCH located in IRB 1 slot 0, interlace group 410-f may be mapped to PSSCH 1 in subchannel or IRB 1 and slot 1, interlace group 410-g may be mapped to PSSCH 2 in subchannel or IRB 1 and slot 1, and interlace group 410-h may be mapped to PSSCH 3 in subchannel or IRB 1 and slot 3. Interlace group 410-i may be mapped to PSSCH located in subchannel or IRB 2 in slot 0, interlace group 410-j may be mapped to PSSCH 1 in subchannel or IRB 2 slot 1, and interlace group 410-k may be mapped to PSSCH 2 in subchannel or IRB 2 and slot 2, and so on.

[0113] A first or initial interlace may be allocated within a set of interlaces based on the broadcast type and associated HARQ feedback of the sidelink message 420. For example, a receiving UE may receive a sidelink message 420-a (e.g., a unicast sidelink message associated with a transmitter or layer 1 identifier ID as "0"). The UE may determine the allocated interlace according to Equation 3:

[0114] Equation 3: PSFCH interleave = ID mod (i × j)

[0115] Where ID indicates an identifier of the transmitter of the sidelink message 420-a, i represents the number of interlaces per interlace group 410, and j represents the number of CS pairs per interlace group 410. Therefore, the receiving UE can determine the assigned interlace via PSFCH interlace=ID mod(i×j)=0 mod(4×1)=0, where ID=0 is for the ID of the transmitting UE, i=4 is for 4 interlaces per interlace group, and j=1 is for one CS pair per interlace group (e.g., interlace 0 among interlaces 0, 1, 2, and 3) within the interlace group 410-a of the sidelink message 420-a.

[0116] In some examples, the sidelink message 420-a may be a multicast type 1 message. In such examples, the receiving UE may determine the allocated interlacing according to Equation 4:

[0117] Equation 4: PSFCH interleave = ID mod (i × j)

[0118] Where ID indicates an identifier of the transmitter of the sidelink message 420-a, i represents the number of interlaces per interlace group 410, and j represents the number of CS pairs per interlace group 410. In such an example, the receiving UE may determine the assigned interlace via PSFCH interlace=ID mod(i×j)=0 mod(4×1)=0, where ID=0 is for the ID of the transmitting UE, i=4 is for 4 interlaces per interlace group, and j=1 is for one CS pair per interlace group (e.g., interlace 0 of interlaces 0, 1, 2, and 3) within interlace group 410-a for the NACK message of the sidelink message 420-a.

[0119] Similarly, a receiving UE may receive sidelink message 420-b (e.g., a multicast type 2 sidelink message associated with ID "1" for a transmitting UE) and may determine the interlaces allocated in interlace group 410-f and in interlace group 410-j according to Equation 5:

[0120] Equation 5: PSFCH interleaving = (ID + ID MRX )mod(i×j)

[0121] Where D indicates the identifier of the sender of the side link message 420-a, ID MRX 4 indicates an identifier of the receiving UE, i represents the number of interlaces per interlace group 410, and j represents the number of CS pairs per interlace group 410. The receiving UE can thus determine the interlace used to send feedback for the sidelink message 420-b (e.g., via PSFCH interlace = (ID + ID MRX )mod(i×j)=(1+{0,1,2})mod(4×1)={1,2,3}mod4={1,2,3}, where ID=1 is for the ID of the transmitting UE, i=4 is for the 4 interlaces per interlace group, and j=1 is for one CS pair per interlace group, and via PSFCH interlace=(ID+ID MRX )mod(i×j)=(1+{3,4,5})mod(4×1)={4,5,6}mod4={0,1,2} for six receiving UEs with member IDs “0”, “1”, “2”, “3”, “4”, and “5”). The receiving UE may also determine one or more replica interlaces of the first interlace associated with the sidelink transmission addressed to the receiving UE, as shown in reference to Figure 3 The sending UE may perform a reference Figure 3 and Figure 4 The mapping technique is described to determine an allocated first interlace associated with a corresponding sidelink transmission on which sidelink feedback signaling for its sidelink transmission is monitored.

[0122] Figure 5 An example of a sidelink interleaving feedback scheme 500 that supports interleaving feedback of sidelink communications via an unlicensed channel according to one or more aspects of the present disclosure is illustrated. The sidelink interleaving feedback scheme 500 may implement or be implemented by aspects of the wireless communication system 100 and the wireless communication system 200, as well as the sidelink interleaving feedback scheme 300 and the sidelink interleaving feedback scheme 400. For example, it may be reference Figures 1 to 4 One or more UEs (e.g., UE 115) and one or more network entities (e.g., network entity 105) of the example of the corresponding device described may perform wireless communication according to the sidelink staggered feedback scheme 500. The UE may communicate sidelink data during one or more PSSCHs (e.g., PSSCH 0, PSSCH 1, and PSSCH 2) associated with a feedback symbol (e.g., PSFCH symbol 515). The PSFCH symbol 515 may be allocated per time resource set (e.g., every 1, 2, or 4 time slots) within a resource pool based on preconfiguration or configuration. The UE may communicate with each other using an unlicensed spectrum such as an LBT subchannel 505 in one or more time resources (e.g., time slot 0 and time slot 1) and one or more frequency resources (e.g., a frequency resource set such as IRB 0, IRB 1, IRB 2, IRB 3, IRB 4, and IRB 5, or any other subset of frequency resources such as a subchannel of the LBT subchannel 505). In some examples, the IRB may be located within a subchannel (eg, subchannel 0).

[0123] The receiving UE may assign a first (e.g., initial) interlace for each detected sidelink message 520 (e.g., whether addressed to the receiving UE) that is interlaced in frequency (e.g., frequency domain multiplexed (FDM) sidelink messages 520-a and 520-b in time slot 0) or that is not interlaced in frequency (e.g., sidelink message 520-c in time slot 1), where the sidelink messages 520 share PSFCH symbols 515. The receiving UE may determine the assignment of the first (e.g., initial) interlace for each detected sidelink transmission on the PSSCH based on PSSCH transmission resources in frequency (e.g., IRBs) and time (e.g., time slots) and different broadcast types using an interlace mapping rule (e.g., which may be configured by the network or another sidelink UE, or may be preconfigured by a manufacturer or service provider, or defined in one or more standard documents). Similarly, the transmitting UE may determine the allocation of a first interlace for its sidelink transmissions that are interlaced or non-interlaced in frequency on the PSSCH based on the PSSCH transmission resources in frequency and time and the different broadcast types using an interlace mapping rule, and monitor the first interlace for sidelink feedback for its sidelink transmissions.

[0124] An interlace group (e.g., interlace group 510) may be mapped per PSSCH transmission resource in frequency (e.g., IRB) and per PSSCH transmission resource in time (e.g., time slot). Each interlace group 510 may include one or more PRBs (e.g., 4 PRBs per interlace group 510). For example, interlace group 510-a may be mapped to PSSCH 0 in IRB 0 and time slot 0, and interlace group 510-b may be mapped to PSSCH in IRB 0 and time slot 1. Interlace group 510-c may be mapped to PSSCH 1 in IRB 1 and time slot 0, and interlace group 510-d may be mapped to PSSCH 2 in IRB 1 and time slot 1. Interlace group 510-e may be mapped to PSSCH 0 in IRB 2 and time slot 0, and interlace group 510-f may be mapped to PSSCH 2 in IRB 2 and time slot 1. Interlace group 510-g may be mapped to IRB 3 and PSSCH 1 in slot 0, and interlace group 510-h may be mapped to IRB 3 and PSSCH 2 in slot 1. Interlace group 510-i may be mapped to IRB 4 and PSCH 0 in slot 0, and interlace group 510-j may be mapped to IRB 4 and PSSCH in slot 1. Interlace group 510-k may be mapped to IRB 5 and PSSCH 1 in slot 0, and so on.

[0125] A first interlace of the sidelink message 520 may be allocated within the interlace group 510 based on the broadcast type and the associated HARQ feedback. For example, a receiving UE may detect a unicast message (e.g., from a transmitting UE) associated with a transmitting UE ID (e.g., ID=0) having PSSCH 0, which is interlaced with PSSCH 1. The UE may perform a first PSFCH interlace mapping (e.g., for PSSCH 1) using Equation 3 as follows: Figure 4 Detailed description): PSFCH interlace = ID mod (i × j) = 0 mod (4 × 1) = 0, where ID = 0 is for the ID of the transmitting UE, i = 4 is for the 4 interlaces per interlace group, and j = 1 is for one CS pair per interlace group. The receiving UE may map the first interlace of the sidelink message 520-a to interlace 0 in the interlace group 510-a.

[0126] The receiving UE may detect the sidelink message 520-b via PSSCH 1, where PSSCH 1 is interleaved with PSSCH 0, and the sidelink message 520-b may be a multicast type 1 sidelink message. The UE may perform the first PSFCH interleaving mapping (e.g., for PSSCH 0) as follows using Equation 4: Figure 4 Detailed description): PSFCH interlace = ID mod (i × j) = 1 mod (4 × 1) = 1, where ID = 1 is for the ID of the transmitting UE, i = 4 is for the 4 interlaces per interlace group, and j = 1 is for one CS pair per interlace group. The receiving UE may map the first interlace of the sidelink message 520-b to interlace 1 in the interlace group 510-c.

[0127] The transmitting UE may send a sidelink message 520-c in PSSCH 2. The sidelink message 520-c may be a multicast type 2 message (e.g., addressed to 6 UEs with member IDs "0", "1", "2", "3", "4", and "5", respectively). Each receiving UE may perform PSFCH resource mapping. For a member ID of ID MRX = 0, using equation 5 (as for Figure 4 Detailed description)PSFCH interleaving = (ID+ID MRX )mod(i×j)=(2+0)mod(4×1)=2mod4=2, where ID=2 is for the ID of the transmitting UE, i=4 is for 4 interlaces per interlace group, and j=1 is for one CS pair per interlace group, the receiving UE may map the first interlace of the sidelink message 520-c to interlace 2 of the interlace group 510-d. For a member ID of ID MRX = 1, using PSFCH interleaving = (ID + ID MRX)mod(i×j)=(2+1)mod(4×1)=3, the receiving UE may map the first interlace of the sidelink message 520-c to interlace 3 of the interlace group 510-d. MRX =2 receiving UE, use PSFCH interleaving = (ID + ID MRX )mod(i×j)=(2+2)mod(4×1)=0, the receiving UE may map the first interlace of the sidelink message 520-c to interlace 0 of the interlace group 510-f. MRX =3 receiving UE, use PSFCH interleaving = (ID + ID MRX )mod(i×j)=(2+3)mod(4×1)=1, the receiving UE may map the first interlace of the sidelink message 520-c to interlace 1 of the interlace group 510-f. MRX =4 receiving UE, use PSFCH interleaving = (ID + ID MRX )mod(i×j)=(2+4)mod(4×1)=2, the receiving UE may map the first interlace of the sidelink message 520-c to the interlace 2 of the interlace group 510-f. MRX =5 receiving UE, PSFCH interleaving = (ID+ID MRX )mod(i×j)=(2+5)mod(4×1)=3, the receiving UE may map the first interlace of the sidelink message 520-c to interlace 3 of the interlace group 510-f.

[0128] The receiving UE may also determine one or more replica interlaces of a first interlace associated with a sidelink transmission on a PSSCH addressed to the receiving UE, as described with reference to Figure 3 and Figure 6 to Figure 7 The sending UE may perform a reference Figures 3 to 5 The mapping technique is described to determine an allocated first interlace associated with its transmission on which to monitor sidelink feedback signaling for its transmission.

[0129] Figure 6 An example of a sidelink interleaving feedback scheme 600 that supports interleaving feedback of sidelink communications via an unlicensed channel according to one or more aspects of the present disclosure is illustrated. The sidelink interleaving feedback scheme 600 may implement or be implemented by aspects of the wireless communication system 100 and the wireless communication system 200 and the sidelink interleaving feedback scheme 300, the sidelink interleaving feedback scheme 400, and the sidelink interleaving feedback scheme 500. For example, it may be reference Figures 1 to 5One or more UEs (e.g., UE 115) and one or more network entities (e.g., network entity 105) of the example of the corresponding device described may perform wireless communication according to the sidelink staggered feedback scheme 600. The UE may communicate sidelink data during one or more PSSCHs (e.g., PSSCH 0, PSSCH 1, and PSSCH 2) associated with a feedback symbol (e.g., PSFCH symbol 615). The PSFCH symbol 615 may be allocated per time resource set (e.g., every 1, 2, or 4 time slots) within a resource pool based on preconfiguration or configuration. The UE may communicate with each other using an unlicensed spectrum such as an LBT subchannel 605 in one or more time resources (e.g., time slot 0 and time slot 1) and one or more frequency resources (e.g., a frequency resource set such as IRB 0, IRB 1, IRB 2, IRB 3, IRB 4, and IRB 5, or any other subset of frequency resources such as a subchannel of the LBT subchannel 605).

[0130] The receiving UE may determine the allocation of one or more copies for each first interlacing associated with a side link transmission addressed to the receiving UE, which may support the satisfaction of the OCB condition. The receiving UE may determine the allocation of copies based on each first (e.g., initial) interlacing of each detected side link message (e.g., regardless of whether the side link message is addressed to the receiving UE). As described herein, the receiving UE may ignore copies of other side link interlacings sent by other UEs. For example, the UE may detect all side link transmissions sharing a common PSFCH symbol 615 within the LBT subchannel 605 (e.g., any side link transmission sharing a PSFCH symbol 615 associated with a side link message 620 for the receiving UE and / or other UEs). The receiving UE may calculate all first interlacings associated with the detected side link transmissions (e.g., the receiving UE may decode the SCI for the broadcast type or HARQ feedback type and the layer 1 source identifier or layer 1 transmitter identifier, or the receiver member identifier, or any combination thereof, to detect all side link messages sent during the resource associated with the PSFCH symbol 615). The receiving UE may detect one or more sidelink messages 620 and may map the sidelink feedback first interlace to the PSFCH symbol 615 as described herein. For example, as described in reference Figure 5To describe in more detail, the receiving UE may detect a unicast sidelink message 620-a via PSSCH 0 and a multicast type 1 sidelink message 620-b via PSSCH 1 in time slot 0 (e.g., PSSCH 0 and PSSCH 1 are interleaved in time slot 0), and a multicast type 2 sidelink message 620-c via PSSCH 2 in time slot 1 (e.g., PSSCH 2 is not interleaved in time slot 1). The receiving UE may map a first interlace (e.g., an initial interlace) of the sidelink message 620-a to interlace 0 in interlace group 610-a, may map a first interlace of the sidelink message 620-b to interlace 1 of interlace group 610-c, and may map a first interlace of the sidelink message 620-c to interlace 2 of interlace group 610-d (e.g., for member ID ID MRX = 0), mapping the first interlace of sidelink message 620-c to interlace 3 of interlace group 610-d (e.g., for member ID ID MRX = 1), mapping the first interlace of sidelink message 620-c to interlace 0 of interlace group 610-f (e.g., for member ID ID MRX = 2), mapping the first interlace of side link message 620-c to interlace 1 of interlace group 610-f (e.g., for member ID ID MRX =3), mapping the first interlace of side link message 620-c to interlace 2 of interlace group 610-f (e.g., for member ID ID MRX =4), and maps the first interlace of side link message 620-c to interlace 3 of interlace group 610-f (e.g., for member ID ID MRX =5).

[0131] After determining the allocation of the initial interlace for each detected sidelink message 620, the UE may determine the allocation of one or more copies of the first interlace associated with the sidelink transmission addressed to UE 115 (e.g., without reference to any additional sidelink transmissions for other UEs). In some examples, the allocation of copies for the interlace may be based on a replication mapping rule, such as a replication distance, which may be configured or preconfigured, or indicated in one or more standard documents. For example, replication distance 625 may indicate the number of resources (e.g., the number of PRBs, the number of subchannels, or the number of IRBs, etc.). The receiving UE may map the copies of the interlace to PSFCH symbols according to the replication mapping rule (e.g., replication distance 625).

[0132] If the copy of the first interlace for the first sidelink transmission (e.g., addressed to the receiving UE) does not overlap with the first interlace (e.g., initial interlace) for the second sidelink transmission (e.g., addressed to or not addressed to the receiving UE), the receiving UE may send a copy of the first interlace of the first sidelink message. For example, the receiving UE may map the first interlace to interlace 0 of interlace group 610-a of the sidelink message 620-a. The receiving UE may further map the copy of the first interlace (e.g., second interlace) to interlace 0 of interlace group 610-c. Since no first (e.g., initial) interlace occupies interlace 0 of interlace group 610-c based on the replication distance 625 (e.g., 1 IRB as shown), the receiving UE may also replicate the feedback message via the second interlace (first replica interlace) at interlace 0 of interlace group 610-c. Similarly, in the absence of a first interlace of an occupied mapped replica interlace, the UE may replicate the side link feedback message of the side link message 620-a (e.g., according to the replication distance 625 and the interlace mapping rule) via a third interlace (second replica interlace) at interlace 0 of interlace group 610-e, a fourth interlace (third replica interlace) at interlace 0 of interlace group 610-g, a fifth interlace (fourth replica interlace) at interlace 0 of interlace group 610-i, and a sixth interlace (fifth replica interlace) at interlace 0 of interlace group 610-k. Similarly, the UE may send a feedback message of the side link message 620-b in the first interlace via interlace 1 of interlace group 610-c, and may also copy the side link feedback message of the side link message 620-b via the second interlace (first copy interlace) at interlace 1 of interlace group 610-a, the third interlace (second copy interlace) at interlace 1 of interlace group 610-e, the fourth interlace (third copy interlace) at interlace 1 of interlace group 610-g, the fifth interlace (fourth copy interlace) at interlace 1 of interlace group 610-i, and the sixth interlace (fifth copy interlace) at interlace 1 of interlace group 610-k.

[0133] If the copy of the first interlace transmitted by the first sidelink overlaps with the first interlace transmitted by the second sidelink, then according to the interlace mapping rule, the receiving UE may discard the copy of the first interlace transmitted by the first sidelink to avoid interference with the first interlace. For example, the UE may send sidelink feedback of sidelink message 620-c via the first interlace at interlace 2 of interlace group 610-d (e.g., if member ID ID MRX = 0 for the receiving UE). According to the replication mapping rule (e.g., replication distance 625), the UE may interlace-map the replica of the first interlace to interlace 2 of interlace group 610-f. However, interlace 2 of interlace group 610-f may be occupied by the first (e.g., initial) interlace of another UE (e.g., with member ID ID MRX =4, as reference Figure 5). Therefore, with ID MRX =0 may suppress sending a replica interlace via interlace 2 of interlace group 610-f because interlace 2 of interlace group 610-f is occupied by a first interlace sent by another device. Similarly, if the receiving UE maps a replica of the first interlace to resources occupied by the first interlace for another sidelink message (e.g., the other sidelink message is addressed to or not addressed to the receiving UE), the receiving UE may suppress replicating the sidelink feedback via the mapped replica interlace. The receiving UE may determine whether a PSFCH symbol 615 is occupied at any given interlace based on detecting all sidelink transmissions associated with the PSFCH symbol 615 and applying the interlace mapping rules to the corresponding first interlace, as described herein with reference to Figure 2 As described in 7.

[0134] The replica interlace sent by a given UE may overlap with a replica interlace sent by any other UE (e.g., or by the same UE). The transmitting UE may monitor resources associated with the first (e.g., initial) interlace and may therefore refrain from monitoring PSFCH symbols associated with the replica interlace. For example, according to the interlace mapping rule and the replica distance 625, a member ID ID MRX = 0 may send feedback signaling of sidelink message 620-c via the first interlace at interlace 2 of interlace group 610-d and may interlace map the replica to interlace 2 of interlace group 610-h. MRX =4 can send feedback signaling of sidelink message 620-c via first interlace 2 of interlace group 610-f, and can interlace map the copy to interlace 2 of interlace group 610-h. Regardless of whether interlace 2 of interlace group 610-h is used for member ID ID MRX = 0 and UE with member ID MRX = 0, both UEs may send duplicate interleavings (e.g., not one UE deferring to the other, as would be the case if one UE was sending the initial interleaving). The sending UE may send a duplicate interleaving for the UE with member ID ID MRX = 0, and may monitor interlace 2 of interlace group 610-d for UEs with member ID ID MRX = 4. Therefore, interference caused by a UE via interlace 2 of interlace 610-h (eg, and interlace 610-j) may not have a negative impact on the sending UE's reception of the feedback signaling.

[0135] As described herein, sending feedback via a first interlace and a copy of the first interlace for each received sidelink message 620 (e.g., without causing interference to other initial interlaces) can result in clear and reliable feedback signaling of the sidelink message 620 without causing additional interference and while satisfying OCB conditions.

[0136] Figure 7 An example of a process flow 700 for supporting interleaved feedback of sidelink communications via an unlicensed channel in accordance with one or more aspects of the present disclosure is illustrated. The process flow 700 may implement or be implemented by aspects of the wireless communication system 100 and the wireless communication system 200 and the sidelink interleaved feedback scheme 300, the sidelink interleaved feedback scheme 400, the sidelink interleaved feedback scheme 500, and the sidelink interleaved feedback scheme 600. For example, it may be referenced Figures 1 to 6 One or more UEs (e.g., UE 115-d, UE 115-e, UE 115-f, and UE 115-g) and one or more network entities (e.g., network entity 105) of the example corresponding device described may perform wireless communications according to process flow 700. UE 115 may send sidelink data during one or more PSSCHs associated with feedback symbols. PSFCH symbols may be allocated based on preconfiguration or configuration per time resource set (e.g., every 1, 2, or 4 time slots) within a resource pool. UE 115 may communicate with each other using an unlicensed spectrum such as an LBT subchannel in one or more time resources and one or more frequency resources. UE 115-d and UE 115-e may be referred to as transmitting UEs, and UE 115-f and UE 115-g may be referred to as receiving UEs, as referred to herein. Figures 1 to 6 described.

[0137] At 705, UE 115 may identify configuration information. The configuration information may be preconfigured, hard-coded at UE 115, or indicated in one or more standard documents. In some examples, UE 115 may receive configuration information indicating parameters for staggered mapping rules and replication rules (e.g., from other UEs 115 or from network entity 105), and staggered mapping and replication may be based on these parameters, respectively. The parameters may include an offset value (e.g., a replication distance) indicating the number of frequency resources of the side link feedback symbol between a first side link feedback resource set (e.g., a first or initial staggered for a given side link message) and a second side link feedback resource set (e.g., a replica staggered for the same side link message). Thus, UE 115 may be preconfigured or configured with side link unlicensed (SLU) configuration information (e.g., as indicated by a configuration parameter or information element (such as an SLU configuration)). The configuration information may include parameters related to IRBs (e.g., the number of PRBs), first interleaving configuration (e.g., z consecutive or non-consecutive PRBs in a given interleaving group), replica configuration (e.g., distances in PRBs or IRBs used for interleaving replication), or any combination thereof.

[0138] When transmitting, UE 115 may transmit sidelink communications. For example, at 710-a, UE 115-d may transmit a sidelink message (e.g., a unicast message with ID=0, or a multicast type 1 message with ID=0, as described herein, on a first PSSCH0). At 710-b, transmitting UE 115-e may transmit a sidelink message, such as a multicast type 2 message (e.g., with ID=1, as described herein, on a second PSSCH 1).

[0139] At 715, each receiving UE (e.g., UE 115-f and any number of receiving UEs 115-g) may monitor all sidelink transmissions associated with the common PSFCH symbols (e.g., sidelink transmissions via PSSCH 0 and PSSCH 1 at 710). For example, UE 115-f may monitor and detect the sidelink message transmitted at 710-b even though the multicast type 2 sidelink message is addressed to sidelink UE 115-g, rather than to UE 115-f.

[0140] At 720-a, UE 115-d may determine a first interlace for receiving sidelink feedback associated with the sidelink message sent at 710-a from UE 115-f. At 720-b. UE 115-e may determine one or more first interlaces associated with sidelink feedback for the sidelink message sent at 710-b. At 730-a and 730-b, UE 115-d and UE 115-e may monitor the identified first interlaces for feedback signaling from UE 115-f and UE 115-g, respectively.

[0141] At 725, the receiving UE 115 may determine a first interlace for the detected sidelink message (e.g., the sidelink transmission via PSSCH 0 and PSSCH 1 at 710). For example, as described herein, at 725-a, the UE 115-f may map a set of sidelink feedback resources of a first interlace for each sidelink feedback associated with the detected sidelink transmission (e.g., the sidelink transmission via PSSCH 0 and PSSCH 1 at 710), respectively. The UE 115-f may generate sidelink feedback for a transmission on a first sidelink interlace (e.g., one or more contiguous or non-contiguous PRBs in a given set of sidelink interlaces) associated with the transmission addressed thereto (e.g., the sidelink transmission via PSSCH0 at 710a). Similarly, at 725-b, each of the UEs 115-g may map a first interlace set of sidelink feedback resources for each sidelink feedback associated with a detected sidelink transmission (e.g., sidelink transmissions via PSSCH 0 and PSSCH1 at 710) according to a mapping rule. The UE 115-e may further map an interlace as a replica of its first interlace for sidelink feedback associated with the sidelink message 710-a to the feedback symbol (e.g., based on determining whether the first interlace for sidelink feedback from any UE is occupying the interlace mapped for the replica interlace). Similarly, each of the UEs 115-g may further map an interlace as a replica of its first interlace for sidelink feedback associated with the sidelink message 710-b to the feedback symbol (e.g., based on determining whether the first interlace for sidelink feedback from any UE is occupying the interlace mapped for the replica interlace).

[0142] At 725, each of the receiving UEs 115 may determine whether to allocate a second set of side link feedback resources for a second interlace as a copy of a first (e.g., initial) interlace in one or more interlaces for side link feedback associated with the first side link message based on whether the copy of the first interlace associated with the first side link message overlaps with the first interlace for side link feedback associated with the second side link message in the one or more side link messages. For example, UE 115-f may allocate a second set of side link feedback resources for a second interlace as a copy of the first interlace associated with the side link message received at 710-a. If the copy interlace overlaps with the side link feedback resources of the first (e.g., initial) interlace for the side link message detected at 710-b (e.g., for UE 115-g), UE 115-f may refrain from duplicating the feedback message of the side link message received at 710-a in the copy interlace. However, if the replica interlace is not occupied by the first interlace of another sidelink message, UE 115-e can allocate the replica interlace for replicating the sidelink feedback of the sidelink message received at 710-a. If the replica interlace is occupied by another replica interlace (e.g., by UE 115-g), UE 115-f can still send feedback signaling for the sidelink message received at 710-a in both the initial interlace and the replica interlace at the PSFCH symbol. Similarly, the first UE in UE 115-g can allocate a second set of sidelink feedback resources for the second interlace as a replica of the first interlace associated with the sidelink message received at 710-b. If the replica interlace overlaps with the sidelink feedback resources of the first (e.g., initial) interlace for a sidelink message detected at 710-a (e.g., for UE 115-f) or detected at 710-b (e.g., for a second UE in UE 115-g), the first UE in UE 115-g may refrain from replicating the feedback message of the sidelink message received at 710-b in the replica interlace. However, if the replica interlace is not occupied by the first interlace of another sidelink message at 710-a or is not occupied by the first interlace of any second UE in UE 115-g for the same sidelink message at 710-b, the first UE in UE 115-g may allocate the replica interlace for replicating the sidelink feedback of the sidelink message received at 710-b. If the replica interlace is occupied by another replica interlace (e.g., by UE 115-f or any second UE in UE 115-g), the first UE in UE 115-g may still send feedback signaling for the sidelink message received at 710-b in both the initial interlace and the replica interlace at the PSFCH symbols.

[0143] At 735, each receiving UE may send a first interlace of any received side link message addressed to the corresponding receiving UE (e.g., carrying HARQ feedback with ACK or NACK). In addition, each receiving UE 115 may send one or more copies, if any, interlaced onto the PSFCH symbol. For example, UE 115-f and UE 115-g may send feedback information, all of which may be interlaced on the PSFCH symbol to meet the threshold OCB condition. UE 115-f may send (e.g., at 735-a) a feedback message for the side link message received at 710-a, and may send the feedback message via the first interlace and any copy interlace not occupied by the first interlace of UE 115-g. Similarly, UE 115-g may send a feedback message for the side link message received at 710-b via the corresponding first interlace determined at 725-b. UE 115-g may also send sidelink feedback via any replica interlace that is not occupied by another first interlace of the sidelink signaling detected at 710 (e.g., the sidelink message at 710-a and the sidelink message at 710-b).

[0144] Figure 8 A block diagram 800 of a device 805 supporting staggered feedback for sidelink communications via an unlicensed channel according to one or more aspects of the present disclosure is shown. The device 805 may be an example of aspects of a UE 115 as described herein. The device 805 may include a receiver 810, a transmitter 815, and a communication manager 820. The device 805 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0145] The receiver 810 may provide means for receiving information such as packets associated with various information channels (e.g., control channels, data channels, information channels related to interleaving feedback for sidelink communications via unlicensed resources), user data, control information, or any combination thereof. The information may be communicated to other components of the device 805. The receiver 810 may utilize a single antenna or a collection of multiple antennas.

[0146] The transmitter 815 may provide means for transmitting signals generated by other components of the device 805. For example, the transmitter 815 may transmit information such as packets associated with various information channels (e.g., control channels, data channels, information channels related to interleaving feedback for sidelink communications via unlicensed resources), user data, control information, or any combination thereof. In some examples, the transmitter 815 may be co-located with the receiver 810 in a transceiver module. The transmitter 815 may utilize a single antenna or a collection of multiple antennas.

[0147] The communication manager 820, the receiver 810, the transmitter 815, or various combinations thereof, or various components thereof may be examples of means for performing various aspects of interleaved feedback of sidelink communications via an unlicensed channel as described herein. For example, the communication manager 820, the receiver 810, the transmitter 815, or various combinations or components thereof may support methods for performing one or more of the functions described herein.

[0148] In some examples, the communication manager 820, the receiver 810, the transmitter 815, or various combinations or components thereof may be implemented in hardware (e.g., in a communication management circuit). The hardware may include a processor, a digital signal processor (DSP), a central processing unit (CPU), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, a microcontroller, discrete gate or transistor logic, discrete hardware components, or any combination thereof that is configured to or otherwise supports components for performing the functions described herein. In some examples, the processor and a memory coupled to the processor may be configured to perform one or more of the functions described herein (e.g., by executing instructions stored in the memory by the processor).

[0149] Additionally or alternatively, in some examples, the communication manager 820, the receiver 810, the transmitter 815, or various combinations or components thereof may be implemented in code executed by a processor (e.g., as communication management software or firmware). If implemented in code executed by a processor, the functionality of the communication manager 820, the receiver 810, the transmitter 815, or various combinations or components thereof may be performed by a general purpose processor (e.g., configured as or otherwise supporting components for performing the functionality described in the present disclosure), a DSP, a CPU, an ASIC, an FPGA, a microcontroller, or any combination of these or other programmable logic devices.

[0150] In some examples, the communication manager 820 can be configured to perform various operations (e.g., receive, obtain, monitor, output, send) using or otherwise cooperating with the receiver 810, the transmitter 815, or both. For example, the communication manager 820 can receive information from the receiver 810, transmit information to the transmitter 815, or be integrated with the receiver 810, the transmitter 815, or both to obtain information, output information, or perform various other operations as described herein.

[0151] According to the examples disclosed herein, the communication manager 820 may support wireless communication at the UE. For example, the communication manager 820 may be configured to or otherwise support a component for detecting one or more side link messages on an unlicensed channel, the one or more side link messages sharing a common side link feedback symbol. The communication manager 820 may be configured to or otherwise support a component for mapping a first set of side link feedback resources of a first interlace in one or more interlaces for each side link feedback associated with one or more side link messages according to an interlace mapping rule associated with a side link feedback resource of a common side link feedback symbol. The communication manager 820 may be configured to or otherwise support a component for determining whether to allocate a second set of side link feedback resources of a second interlace in one or more interlaces for a side link feedback associated with a first side link message in one or more side link messages based at least in part on the following aspects: whether the second interlace overlaps with an additional first interlace in one or more interlaces for side link feedback associated with a second side link message in one or more side link messages, wherein the second interlace is a copy of the first interlace associated with the first side link message, and wherein the first side link message is addressed to the UE. The communications manager 820 may be configured or otherwise support means for transmitting sidelink feedback associated with the first sidelink message via the first interlace during the sidelink feedback symbol according to the mapping and based on the determination.

[0152] Additionally or alternatively, according to examples as disclosed herein, the communication manager 820 may support wireless communication at the UE. For example, the communication manager 820 may be configured to or otherwise support a component for sending one or more side link messages on an unlicensed channel, the one or more side link messages sharing a common side link feedback symbol. The communication manager 820 may be configured to or otherwise support a component for mapping a first set of side link feedback resources of a first interlace in one or more interlaces for each side link feedback associated with the one or more side link messages according to an interlace mapping rule associated with the side link feedback resources of the common side link feedback symbol. The communication manager 820 may be configured to or otherwise support a component for receiving a side link feedback associated with a first side link message in one or more side link messages via a first interlace during a side link feedback symbol according to the mapping.

[0153] By including or configuring a communications manager 820 according to the examples described herein, a device 805 (e.g., a processor controlling the receiver 810, the transmitter 815, the communications manager 820, or a combination thereof or otherwise coupled thereto) may support techniques for sidelink feedback signaling, resulting in more reliable feedback signaling, improved reliability of sidelink communications, improved throughput, more efficient use of available sidelink resources, reduced system latency, reduced interference, and an improved user experience.

[0154] Fig. 9 A block diagram 900 of a device 905 supporting staggered feedback for sidelink communication via an unlicensed channel according to one or more aspects of the present disclosure is shown. The device 905 may be an example of aspects of the device 805 or UE 115 as described herein. The device 905 may include a receiver 910, a transmitter 915, and a communication manager 920. The device 905 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0155] The receiver 910 may provide means for receiving information such as packets associated with various information channels (e.g., control channels, data channels, information channels related to interleaving feedback for sidelink communications via unlicensed resources), user data, control information, or any combination thereof. The information may be communicated to other components of the device 905. The receiver 910 may utilize a single antenna or a collection of multiple antennas.

[0156] The transmitter 915 may provide means for transmitting signals generated by other components of the device 905. For example, the transmitter 915 may transmit information such as packets associated with various information channels (e.g., control channels, data channels, information channels related to interleaved feedback for sidelink communications via unlicensed resources), user data, control information, or any combination thereof. In some examples, the transmitter 915 may be co-located with the receiver 910 in a transceiver module. The transmitter 915 may utilize a single antenna or a collection of multiple antennas.

[0157] Devices 905 or their various components may be examples of components for performing various aspects of interleaved feedback of side link communications via unlicensed channels as described herein. For example, communications manager 920 may include side link message manager 925, interleaved mapping manager 930, interleaved replica manager 935, side link feedback manager 940, or any combination thereof. Communications manager 920 may be examples of various aspects of communications manager 820 as described herein. In some examples, communications manager 920 or their various components may be configured to perform various operations (e.g., receive, obtain, monitor, output, send) using or otherwise in conjunction with receiver 910, transmitter 915, or both. For example, communications manager 920 may receive information from receiver 910, transmit information to transmitter 915, or be integrated with receiver 910, transmitter 915, or both in combination to obtain information, output information, or perform various other operations as described herein.

[0158] According to the examples disclosed herein, the communication manager 920 may support wireless communication at the UE. The sidelink message manager 925 may be configured to or otherwise support a component for detecting one or more sidelink messages on an unlicensed channel, the one or more sidelink messages sharing a common sidelink feedback symbol. The interlace mapping manager 930 may be configured to or otherwise support a component for mapping a first set of sidelink feedback resources of a first interlace in one or more interlaces for each sidelink feedback associated with one or more sidelink messages according to an interlace mapping rule associated with a sidelink feedback resource of a common sidelink feedback symbol. The interlace replica manager 935 may be configured to or otherwise support a component for determining whether to allocate a second set of sidelink feedback resources of a second interlace in one or more interlaces for sidelink feedback associated with a first sidelink message in one or more sidelink messages based at least in part on the following aspects: whether the second interlace overlaps with an additional first interlace in one or more interlaces for sidelink feedback associated with a second sidelink message in one or more sidelink messages, wherein the second interlace is a replica of the first interlace associated with the first sidelink message, and wherein the first sidelink message is addressed to the UE. The sidelink feedback manager 940 may be configured or otherwise support components for transmitting sidelink feedback associated with the first sidelink message via the first interlace during the sidelink feedback symbol according to the mapping and based on the determination.

[0159] Additionally or alternatively, according to the examples disclosed herein, the communication manager 920 may support wireless communication at the UE. The sidelink message manager 925 may be configured to or otherwise support a component for sending one or more sidelink messages on an unlicensed channel, the one or more sidelink messages sharing a common sidelink feedback symbol. The interlace mapping manager 930 may be configured to or otherwise support a component for mapping a corresponding sidelink feedback resource set of each sidelink message in the one or more sidelink messages to a corresponding interlace of one or more interlaces of sidelink resources of the sidelink feedback symbol according to an interlace mapping rule associated with the sidelink feedback signaling, the corresponding sidelink feedback resource set including a first sidelink feedback resource set of a first sidelink message in the one or more sidelink messages. The sidelink feedback manager 940 may be configured to or otherwise support a component for receiving a sidelink feedback associated with a first sidelink message in the one or more sidelink messages via a first interlace during the sidelink feedback symbol according to the mapping.

[0160] Fig.10 A block diagram 1000 of a communication manager 1020 supporting interleaved feedback of sidelink communications via an unlicensed channel is shown in accordance with one or more aspects of the present disclosure. The communication manager 1020 may be an example of aspects of the communication manager 820, the communication manager 920, or both as described herein. The communication manager 1020 or its various components may be examples of components for performing various aspects of interleaved feedback of sidelink communications via an unlicensed channel as described herein. For example, the communication manager 1020 may include a sidelink message manager 1025, an interleaved mapping manager 1030, an interleaved replica manager 1035, a sidelink feedback manager 1040, a mapping configuration manager 1045, a sidelink monitoring manager 1050, a broadcast type manager 1055, or any combination thereof. Each of these components may communicate directly or indirectly with each other (e.g., via one or more buses).

[0161] According to examples as disclosed herein, the communication manager 1020 may support wireless communications at a UE. The sidelink message manager 1025 may be configured to or otherwise support components for detecting one or more sidelink messages on an unlicensed channel, the one or more sidelink messages sharing a common sidelink feedback symbol. The interlace mapping manager 1030 may be configured to or otherwise support components for mapping a first set of sidelink feedback resources of a first interlace of one or more interlaces for each sidelink feedback associated with the one or more sidelink messages according to an interlace mapping rule associated with the sidelink feedback resources of the common sidelink feedback symbol. The interlace replica manager 1035 may be configured to or otherwise support components for determining whether to allocate a second set of sidelink feedback resources of a second interlace in one or more interlaces for sidelink feedback associated with a first sidelink message in one or more sidelink messages based at least in part on whether the second interlace overlaps with an additional first interlace in one or more interlaces for sidelink feedback associated with a second sidelink message in the one or more sidelink messages, wherein the second interlace is a replica of the first interlace associated with the first sidelink message, and wherein the first sidelink message is addressed to the UE. The sidelink feedback manager 1040 may be configured to or otherwise support components for transmitting sidelink feedback associated with the first sidelink message via the first interlace during a sidelink feedback symbol according to the mapping and based on the determination.

[0162] In some examples, the interlace replica manager 1035 may be configured to or otherwise support components for sending side link feedback associated with a first side link message via a replica of a first interlace during a side link feedback symbol based on determining that the replica of the first interlace for the side link feedback associated with the first side link message does not overlap with an additional first interlace for side link feedback associated with a second side link message.

[0163] In some examples, the interlace mapping manager 1030 may be configured to or otherwise support components for mapping a replica of a first interlace for side link feedback associated with a first side link message to a second side link feedback resource set of side link feedback symbols according to a replica mapping rule, wherein the determination is based on the mapping.

[0164] In some examples, the replica mapping rule includes an offset value that indicates a number of frequency resources of the sidelink feedback symbols between the first set of sidelink feedback resources and the second set of sidelink feedback resources for the sidelink feedback symbols.

[0165] In some examples, a first interlace and a copy of the first interlace used for sidelink feedback associated with a first sidelink message satisfy a channel occupancy threshold for sidelink feedback symbols on an unlicensed channel.

[0166] In some examples, the interlace replica manager 1035 may be configured to or otherwise support components for suppressing transmission of a first interlace replica for side link feedback associated with a first side link message via a second side link feedback resource set of side link feedback symbols based on a determination that the second side link feedback resource set of the side link feedback symbols is occupied by an additional first interlace for side link feedback associated with the second side link message.

[0167] In some examples, the sidelink feedback satisfies a channel occupancy threshold for sidelink feedback symbols on an unlicensed channel.

[0168] In some examples, mapping configuration manager 1045 may be configured or otherwise support means for receiving configuration information including at least parameters for an interleaved mapping rule, a replica mapping rule, or both, wherein mapping is based on the parameters.

[0169] In some examples, the sidelink monitoring manager 1050 may be configured to or otherwise support components for monitoring an unlicensed channel for one or more sidelink messages, where detection is based on monitoring and where at least one of the one or more sidelink messages is addressed to one or more additional UEs.

[0170] In some examples, the mapping is based on an interlace mapping rule and a broadcast type of the first sidelink message.

[0171] In some examples, to support sending sidelink feedback, the broadcast type manager 1055 may be configured to or otherwise support components for sending a sidelink feedback message associated with a first sidelink message via a first set of a plurality of physical resource blocks of a first interlace for sidelink feedback, the sidelink feedback message comprising an acknowledgment message or a negative acknowledgment message, wherein the first sidelink message comprises a unicast broadcast type addressed to the UE.

[0172] In some examples, to support sending sidelink feedback, the broadcast type manager 1055 may be configured to or otherwise support components for sending a sidelink feedback message associated with a first sidelink message via a first set of a plurality of physical resource blocks of a first interlace for sidelink feedback, the sidelink feedback message including a negative acknowledgement message indicating that the UE failed to decode the first sidelink message, wherein the first sidelink message includes a multicast broadcast type addressed to a set of a plurality of UEs including the UE, and wherein the first set of the plurality of physical resource blocks is allocated to the set of the plurality of UEs for sending the sidelink feedback according to an interlace mapping rule.

[0173] In some examples, to support sending sidelink feedback, the broadcast type manager 1055 may be configured to or otherwise support components for sending a sidelink feedback message associated with a first sidelink message via a first set of a plurality of physical resource blocks of a first interlace for sidelink feedback, the sidelink feedback message comprising an acknowledgment message or a negative acknowledgment message, wherein the first sidelink message comprises a multicast broadcast type addressed to a set of a plurality of UEs comprising the UE, and wherein the first set of the plurality of physical resource blocks of the first interlace is allocated to each UE in the set of the plurality of UEs for sending the sidelink feedback according to an interlace mapping rule.

[0174] In some examples, the first interlace for sidelink feedback includes a set of multiple physical resource blocks that are contiguous in frequency. In some examples, the first interlace for sidelink feedback includes a set of multiple physical resource blocks that are discontinuous in frequency. In some examples, the first interlace for sidelink feedback includes a set of multiple corresponding physical resource blocks associated with a single cyclic shift. In some examples, the first interlace for sidelink feedback includes a set of multiple corresponding physical resource blocks associated with a set of multiple cyclic shifts.

[0175] Additionally or alternatively, according to examples as disclosed herein, the communication manager 1020 may support wireless communication at the UE. In some examples, the sidelink message manager 1025 may be configured to or otherwise support a component for sending one or more sidelink messages on an unlicensed channel, the one or more sidelink messages sharing a common sidelink feedback symbol. In some examples, the interlace mapping manager 1030 may be configured to or otherwise support a component for mapping a first set of sidelink feedback resources of a first interlace in one or more interlaces for each sidelink feedback associated with one or more sidelink messages according to an interlace mapping rule associated with a sidelink feedback resource of a common sidelink feedback symbol. In some examples, the sidelink feedback manager 1040 may be configured to or otherwise support a component for receiving a sidelink feedback associated with a first sidelink message in one or more sidelink messages via a first interlace during a sidelink feedback symbol according to a mapping.

[0176] In some examples, mapping configuration manager 1045 may be configured or otherwise support means for receiving configuration information including at least parameters for an interleaved mapping rule, a replica mapping rule, or both, wherein mapping is based on the parameters.

[0177] In some examples, the interlace mapping manager 1030 can be configured to or otherwise support components for mapping a first set of sidelink feedback resources of a first interlace for each sidelink feedback associated with one or more sidelink messages based on the interlace mapping rule and the broadcast type of the first sidelink message. In some examples, the sidelink monitoring manager 1050 can be configured to or otherwise support components for monitoring the first interlace for each sidelink feedback associated with the one or more sidelink messages based on the mapping, wherein receiving the sidelink feedback associated with the first sidelink message is based on the monitoring.

[0178] In some examples, to support receiving sidelink feedback, the broadcast type manager 1055 may be configured to or otherwise support components for receiving a sidelink feedback message associated with a first sidelink message via a first set of a plurality of physical resource blocks of a first interlace for sidelink feedback, the sidelink feedback message comprising an acknowledgment message or a negative acknowledgment message, wherein the first sidelink message comprises a unicast broadcast type.

[0179] In some examples, to support receiving sidelink feedback, the broadcast type manager 1055 may be configured to or otherwise support components for receiving at least one sidelink feedback message associated with a first sidelink message via a first set of multiple physical resource blocks of a first interlace for sidelink feedback, the sidelink feedback message including a negative acknowledgement message indicating that at least one of the set of multiple UEs failed to decode the first sidelink message, wherein the first sidelink message includes a multicast broadcast type addressed to the set of multiple UEs, and wherein the first set of physical resource blocks is allocated to the set of multiple UEs for sending sidelink feedback according to an interlace mapping rule.

[0180] In some examples, to support receiving sidelink feedback, the broadcast type manager 1055 may be configured to or otherwise support components for receiving a sidelink feedback message associated with a first sidelink message via a first set of a plurality of physical resource blocks of a first interlace for sidelink feedback, the sidelink feedback message comprising an acknowledgment message or a negative acknowledgment message, wherein the first sidelink message comprises a multicast broadcast type addressed to a set of multiple UEs, and wherein the first set of the plurality of physical resource blocks is allocated to corresponding UEs in the set of multiple UEs for sending sidelink feedback according to an interlace mapping rule.

[0181] In some examples, the first interlace for sidelink feedback includes a set of multiple physical resource blocks that are contiguous in frequency. In some examples, the first interlace for sidelink feedback includes a set of multiple physical resource blocks that are discontinuous in frequency. In some examples, the first interlace for sidelink feedback includes a set of multiple corresponding physical resource blocks associated with a single cyclic shift. In some examples, the first interlace for sidelink feedback includes a set of multiple corresponding physical resource blocks associated with a set of multiple cyclic shifts.

[0182] Fig.11 A diagram of a system 1100 including a device 1105 supporting staggered feedback for sidelink communication via an unlicensed channel according to one or more aspects of the present disclosure is shown. The device 1105 may be an example of a device 805, a device 905, or a UE 115 as described herein, or include components thereof. The device 1105 may communicate (e.g., wirelessly) with one or more network entities 105, one or more UEs 115, or any combination thereof. The device 1105 may include components for two-way voice and data communications, including components for sending and receiving communications, such as a communication manager 1120, an input / output (I / O) controller 1110, a transceiver 1115, an antenna 1125, a memory 1130, a code 1135, and a processor 1140. These components may be electronically communicated or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more buses (e.g., bus 1145).

[0183] I / O controller 1110 can manage input signals and output signals of device 1105. I / O controller 1110 can also manage peripheral devices that are not integrated into device 1105. In some cases, I / O controller 1110 can represent a physical connection or port to an external peripheral device. In some cases, I / O controller 1110 can utilize an operating system, such as or another known operating system. Additionally or alternatively, I / O controller 1110 may represent or interact with a modem, keyboard, mouse, touch screen, or similar device. In some cases, I / O controller 1110 may be implemented as part of a processor (such as processor 1140). In some cases, a user may interact with device 1105 via I / O controller 1110 or via hardware components controlled by I / O controller 1110.

[0184] In some cases, the device 1105 may include a single antenna 1125. However, in some other cases, the device 1105 may have more than one antenna 1125, which may be capable of concurrently transmitting or receiving multiple wireless transmissions. The transceiver 1115 may communicate bidirectionally via one or more antennas 1125, a wired or wireless link, as described herein. For example, the transceiver 1115 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 1115 may also include a modem for: modulating packets; providing the modulated packets to one or more antennas 1125 for transmission; and demodulating packets received from one or more antennas 1125. The transceiver 1115 or the transceiver 1115 and the one or more antennas 1125 may be examples of transmitters 815, transmitters 915, receivers 810, receivers 910, or any combination thereof or components thereof as described herein.

[0185] The memory 1130 may include random access memory (RAM) and read-only memory (ROM). The memory 1130 may store computer-readable, computer-executable code 1135 including instructions that, when executed by the processor 1140, cause the device 1105 to perform various functions described herein. The code 1135 may be stored in a non-transitory computer-readable medium, such as a system memory or another type of memory. In some cases, the code 1135 may not be directly executable by the processor 1140, but may (e.g., when compiled and executed) cause the computer to perform the functions described herein. In some cases, the memory 1130 may also contain, among other things, a basic I / O system (BIOS) that may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0186] Processor 1140 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, processor 1140 may be configured to operate a memory array using a memory controller. In some other cases, the memory controller may be integrated into processor 1140. Processor 1140 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1130) so that device 1105 performs various functions (e.g., functions or tasks that support interleaved feedback of side link communications via unlicensed resources). For example, device 1105 or a component of device 1105 may include processor 1140 and memory 1130 coupled to or coupled to processor 1140, and processor 1140 and memory 1130 are configured to perform various functions described herein.

[0187] According to the examples disclosed herein, the communication manager 1120 may support wireless communication at the UE. For example, the communication manager 1120 may be configured to or otherwise support a component for detecting one or more side link messages on an unlicensed channel, the one or more side link messages sharing a common side link feedback symbol. The communication manager 1120 may be configured to or otherwise support a component for mapping a first set of side link feedback resources of a first interlace in one or more interlaces for each side link feedback associated with one or more side link messages according to an interlace mapping rule associated with a side link feedback resource of a common side link feedback symbol. The communication manager 1120 may be configured to or otherwise support a component for determining whether to allocate a second set of side link feedback resources of a second interlace in one or more interlaces for a side link feedback associated with a first side link message in one or more side link messages based at least in part on the following aspects: whether the second interlace overlaps with an additional first interlace in one or more interlaces for side link feedback associated with a second side link message in one or more side link messages, wherein the second interlace is a copy of the first interlace associated with the first side link message, and wherein the first side link message is addressed to the UE. The communications manager 1120 may be configured or otherwise support means for transmitting sidelink feedback associated with the first sidelink message via the first interlace during the sidelink feedback symbol according to the mapping and based on the determination.

[0188] Additionally or alternatively, according to examples as disclosed herein, the communication manager 1120 may support wireless communication at the UE. For example, the communication manager 1120 may be configured to or otherwise support a component for sending one or more side link messages on an unlicensed channel, the one or more side link messages sharing a common side link feedback symbol. The communication manager 1120 may be configured to or otherwise support a component for mapping a first set of side link feedback resources of a first interlace in one or more interlaces for each side link feedback associated with the one or more side link messages according to an interlace mapping rule associated with the side link feedback resources of the common side link feedback symbol. The communication manager 1120 may be configured to or otherwise support a component for receiving a side link feedback associated with a first side link message in one or more side link messages via a first interlace during the side link feedback symbol according to the mapping.

[0189] By including or configuring a communications manager 1120 according to the examples described herein, the device 1105 may support techniques for sidelink feedback signaling, resulting in more reliable feedback signaling, improved reliability of sidelink communications, improved throughput, more efficient use of available sidelink resources, reduced system latency, reduced interference, and an improved user experience.

[0190] In some examples, the communication manager 1120 may be configured to perform various operations (e.g., receive, monitor, transmit) using or otherwise cooperating with the transceiver 1115, one or more antennas 1125, or any combination thereof. Although the communication manager 1120 is illustrated as a separate component, in some examples, one or more functions described with reference to the communication manager 1120 may be supported or performed by the processor 1140, the memory 1130, the code 1135, or any combination thereof. For example, the code 1135 may include instructions executable by the processor 1140 to cause the device 1105 to perform various aspects of interleaved feedback for sidelink communications via an unlicensed channel as described herein, or the processor 1140 and the memory 1130 may be otherwise configured to perform or support such operations.

[0191] Fig.12 A flow chart illustrating a method 1200 for supporting staggered feedback of sidelink communications via an unlicensed channel according to one or more aspects of the present disclosure is shown. The operations of the method 1200 may be implemented by a UE or a component thereof as described herein. For example, the operations of the method 1200 may be implemented by a UE or a component thereof as described in reference to Figures 1 to 11 The UE 115 described herein may be executed. In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the described functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the described functions.

[0192] At 1205, the method may include detecting one or more side link messages on an unlicensed channel, the one or more side link messages sharing a common side link feedback symbol. The operations of 1205 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1205 may be performed as described in reference to Fig.10 The side link message manager 1025 is used to execute.

[0193] At 1210, the method may include mapping a first set of side link feedback resources of a first interlace of one or more interlaces for each side link feedback associated with one or more side link messages according to an interlace mapping rule associated with side link feedback resources of a common side link feedback symbol. The operations of 1210 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1210 may be performed as described in reference to Fig.10 The interleaving mapping manager 1030 is used to perform the above-mentioned operation.

[0194] At 1215, the method may include determining whether to allocate a second set of sidelink feedback resources of a second interlace in the one or more interlaces for sidelink feedback associated with a first sidelink message in the one or more sidelink messages based at least in part on whether the second interlace overlaps with an additional first interlace in the one or more interlaces used for sidelink feedback associated with the second sidelink message in the one or more sidelink messages, wherein the second interlace is a copy of the first interlace associated with the first sidelink message, and wherein the first sidelink message is addressed to the UE. The operations of 1215 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1215 may be performed as described in reference to Fig.10 The staggered replica manager 1035 is used to execute.

[0195] At 1220, the method may include sending side link feedback associated with the first side link message via the first interlace during the side link feedback symbol according to the mapping and based on the determination. The operations of 1220 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1220 may be performed as described in reference to Fig.10 The side link feedback manager 1040 is used to perform.

[0196] Fig.13 A flow chart illustrating a method 1300 for supporting staggered feedback of sidelink communications via an unlicensed channel according to one or more aspects of the present disclosure is shown. The operations of the method 1300 may be implemented by a UE or a component thereof as described herein. For example, the operations of the method 1300 may be implemented by a UE or a component thereof as described herein. Figures 1 to 11 The UE 115 described herein may be executed. In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the described functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the described functions.

[0197] At 1305, the method may include detecting one or more side link messages on an unlicensed channel, the one or more side link messages sharing a common side link feedback symbol. The operations of 1305 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1305 may be performed as described in reference to Fig.10 The side link message manager 1025 is used to execute.

[0198] At 1310, the method may include mapping a first set of side link feedback resources of a first interlace of one or more interlaces for each side link feedback associated with one or more side link messages according to an interlace mapping rule associated with side link feedback resources of a common side link feedback symbol. The operations of 1310 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1310 may be performed as described in reference to Fig.10The interleaving mapping manager 1030 is used to perform the above-mentioned operation.

[0199] At 1315, the method may include determining whether to allocate a second set of sidelink feedback resources of a second interlace in the one or more interlaces for sidelink feedback associated with a first sidelink message in the one or more sidelink messages based at least in part on whether the second interlace overlaps with an additional first interlace in the one or more interlaces used for sidelink feedback associated with the second sidelink message in the one or more sidelink messages, wherein the second interlace is a copy of the first interlace associated with the first sidelink message, and wherein the first sidelink message is addressed to the UE. The operations of 1315 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1315 may be performed as described in reference to Fig.10 The staggered replica manager 1035 is used to execute.

[0200] At 1320, the method may include transmitting, during the sidelink feedback symbol, sidelink feedback associated with the first sidelink message via the first interlace according to the mapping and based on the determination. The operations of 1320 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1320 may be performed as described in reference to Fig.10 The side link feedback manager 1040 is used to perform.

[0201] At 1325, the method may include transmitting sidelink feedback associated with a first sidelink message via a copy of a first interlace during a sidelink feedback symbol based on determining that the copy of the first interlace for the sidelink feedback associated with the first sidelink message does not overlap with an additional first interlace for sidelink feedback associated with a second sidelink message. The operations of 1325 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1325 may be performed as described in reference to Fig.10 The staggered replica manager 1035 is used to execute.

[0202] Fig.14 A flow chart illustrating a method 1400 for supporting staggered feedback of sidelink communications via an unlicensed channel according to one or more aspects of the present disclosure is shown. The operations of the method 1400 may be implemented by a UE or a component thereof as described herein. For example, the operations of the method 1400 may be implemented by a UE or a component thereof as described in reference to Figures 1 to 11 The UE 115 described herein may be executed. In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the described functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the described functions.

[0203] At 1405, the method may include detecting one or more side link messages on an unlicensed channel, the one or more side link messages sharing a common side link feedback symbol. The operations of 1405 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1405 may be performed as described in reference to Fig.10 The side link message manager 1025 is used to execute.

[0204] At 1410, the method may include mapping a first set of side link feedback resources of a first interlace of one or more interlaces for each side link feedback associated with one or more side link messages according to an interlace mapping rule associated with side link feedback resources of a common side link feedback symbol. The operations of 1410 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1410 may be performed as described in reference to Fig.10 The interleaving mapping manager 1030 is used to perform the above-mentioned operation.

[0205] At 1415, the method may include determining whether to allocate a second set of sidelink feedback resources of a second interlace in the one or more interlaces for sidelink feedback associated with a first sidelink message in the one or more sidelink messages based at least in part on whether the second interlace overlaps with an additional first interlace in the one or more interlaces used for sidelink feedback associated with the second sidelink message in the one or more sidelink messages, wherein the second interlace is a copy of the first interlace associated with the first sidelink message, and wherein the first sidelink message is addressed to the UE. The operations of 1415 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1415 may be performed as described in reference to Fig.10 The staggered replica manager 1035 is used to execute.

[0206] At 1420, the method may include transmitting side link feedback associated with the first side link message via the first interlace during the side link feedback symbol according to the mapping and based on the determination. The operations of 1420 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1420 may be performed as described in reference to Fig.10 The side link feedback manager 1040 is used to perform.

[0207] At 1425, the method may include refraining from transmitting a copy of a first interlace for sidelink feedback associated with the first sidelink message via a second sidelink feedback resource set of sidelink feedback symbols based on the determination that the second sidelink feedback resource set of sidelink feedback symbols is occupied by an additional first interlace for sidelink feedback associated with the second sidelink message. The operations of 1425 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1425 may be performed as described in reference to Fig.10The staggered replica manager 1035 is used to execute.

[0208] Fig.15 A flow chart illustrating a method 1500 for supporting staggered feedback of sidelink communications via an unlicensed channel according to one or more aspects of the present disclosure is shown. The operations of the method 1500 may be implemented by a UE or a component thereof as described herein. For example, the operations of the method 1500 may be implemented by a UE or a component thereof as described in reference to Figures 1 to 11 The UE 115 described herein may be executed. In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the described functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the described functions.

[0209] At 1505, the method may include receiving configuration information including parameters for interleaving mapping, interleaving replica rules, or both. The operations of 1505 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1505 may be performed as described in reference to Fig.10 The mapping configuration manager 1045 is used to execute.

[0210] At 1510, the method may include detecting one or more side link messages on an unlicensed channel, the one or more side link messages sharing a common side link feedback symbol. The operations of 1510 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1510 may be performed as described in reference to Fig.10 The side link message manager 1025 is used to execute.

[0211] At 1515, the method may include mapping a first set of side link feedback resources of a first interlace of the one or more interlaces for each side link feedback associated with the one or more side link messages according to an interlace mapping rule associated with the side link feedback resources of the common side link feedback symbol, wherein the mapping is based at least in part on the parameter. The operations of 1515 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1515 may be performed as described in reference to Fig.10 The interleaving mapping manager 1030 is used to perform the above-mentioned operation.

[0212] At 1520, the method may include determining whether to allocate a second set of sidelink feedback resources of a second interlace in one or more interlaces for sidelink feedback associated with a first sidelink message in one or more sidelink messages based at least in part on whether the second interlace overlaps with an additional first interlace in one or more interlaces used for sidelink feedback associated with a second sidelink message in the one or more sidelink messages, wherein the second interlace is a copy of the first interlace associated with the first sidelink message, and wherein the first sidelink message is addressed to the UE. The operations of 1520 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1520 may be performed as described in reference to Fig.10 The staggered replica manager 1035 is used to execute.

[0213] At 1525, the method may include sending side link feedback associated with the first side link message via the first interlace during the side link feedback symbol according to the mapping and based on the determination. The operations of 1525 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1525 may be performed as described in reference to Fig.10 The side link feedback manager 1040 is used to perform.

[0214] Fig.16 A flow chart illustrating a method 1600 for supporting staggered feedback of sidelink communications via an unlicensed channel according to one or more aspects of the present disclosure is shown. The operations of the method 1600 may be implemented by a UE or a component thereof as described herein. For example, the operations of the method 1600 may be implemented by a UE or a component thereof as described in reference to Figures 1 to 11 The UE 115 described herein may be executed. In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the described functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the described functions.

[0215] At 1605, the method may include sending one or more side link messages on an unlicensed channel, the one or more side link messages sharing a common side link feedback symbol. The operations of 1605 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1605 may be performed as described in reference to Fig.10 The side link message manager 1025 is used to execute.

[0216] At 1610, the method may include mapping a first set of side link feedback resources of a first interlace of one or more interlaces for each side link feedback associated with one or more side link messages according to an interlace mapping rule associated with side link feedback resources of a common side link feedback symbol. The operations of 1610 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1610 may be performed as described in reference to Fig.10The interleaving mapping manager 1030 is used to perform the above-mentioned operation.

[0217] At 1615, the method may include receiving side link feedback associated with a first side link message of the one or more side link messages via a first interlace during a side link feedback symbol according to the mapping. The operations of 1615 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1615 may be performed as described in reference to Fig.10 The side link feedback manager 1040 is used to perform.

[0218] Fig.17 A flow chart illustrating a method 1700 for supporting staggered feedback of sidelink communications via an unlicensed channel according to one or more aspects of the present disclosure is shown. The operations of the method 1700 may be implemented by a UE or a component thereof as described herein. For example, the operations of the method 1700 may be implemented by a UE or a component thereof as described in reference to Figures 1 to 11 The UE 115 described herein may be executed. In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the described functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the described functions.

[0219] At 1705, the method may include receiving configuration information including at least parameters for an interleaved mapping rule, a replica mapping rule, or both. The operations of 1705 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1705 may be performed as described in reference to Fig.10 The mapping configuration manager 1045 is used to execute.

[0220] At 1710, the method may include sending one or more side link messages on an unlicensed channel, the one or more side link messages sharing a common side link feedback symbol. The operations of 1710 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1710 may be performed as described in reference to Fig.10 The side link message manager 1025 is used to execute.

[0221] At 1715, the method may include mapping a first set of side link feedback resources of a first interlace of the one or more interlaces for each side link feedback associated with the one or more side link messages according to an interlace mapping rule associated with the side link feedback resources of the common side link feedback symbol, wherein the mapping is based at least in part on the parameter. The operations of 1715 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1715 may be performed as described in reference to Fig.10 The interleaving mapping manager 1030 is used to perform the above-mentioned operation.

[0222] At 1720, the method may include receiving side link feedback associated with a first side link message of the one or more side link messages via a first interlace during a side link feedback symbol according to the mapping. The operations of 1720 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1720 may be performed as described in reference to Fig.10 The side link feedback manager 1040 is used to perform.

[0223] The following provides an overview of various aspects of the disclosure:

[0224] Aspect 1. A method for wireless communication at a UE, the method comprising: detecting one or more sidelink messages on an unlicensed channel, the one or more sidelink messages sharing a common sidelink feedback symbol; mapping a first set of sidelink feedback resources of a first interlace in one or more interlaces for each sidelink feedback associated with the one or more sidelink messages according to an interlace mapping rule associated with the sidelink feedback resources of the common sidelink feedback symbol; determining whether to allocate a second set of sidelink feedback resources of a second interlace in the one or more interlaces for sidelink feedback associated with a first sidelink message in the one or more sidelink messages based at least in part on whether the second interlace overlaps with an additional first interlace in the one or more interlaces used for the sidelink feedback associated with a second sidelink message in the one or more sidelink messages, wherein the second interlace is a copy of the first interlace associated with the first sidelink message, and wherein the first sidelink message is addressed to the UE; and sending sidelink feedback associated with the first sidelink message via the first interlace during the sidelink feedback symbol according to the mapping and at least in part based on the determination.

[0225] Aspect 2. According to the method according to Aspect 1, the method also includes: at least in part based on the determination to send the side link feedback associated with the first side link message via the copy of the first interlace during the side link feedback symbol, wherein the copy of the first interlace for the side link feedback associated with the first side link message does not overlap with the additional first interlace for the side link feedback associated with the second side link message.

[0226] Aspect 3. According to the method of Aspect 2, the method also includes: mapping the first staggered copy of the side link feedback associated with the first side link message to a second side link feedback resource set of the side link feedback symbol according to a copy mapping rule, wherein the determination is at least partially based on the mapping.

[0227] Aspect 4. A method according to Aspect 3, wherein the replica mapping rule includes an offset value, and the offset value indicates the number of frequency resources of the side link feedback symbol between the first side link feedback resource set and the second side link feedback resource set of the side link feedback symbol.

[0228] Aspect 5. A method according to aspects 2 to 4, wherein the first interlace and the copy of the first interlace used for the sidelink feedback associated with the first sidelink message meet a channel occupancy threshold for the sidelink feedback symbol on the unlicensed channel.

[0229] Aspect 6. The method according to Aspect 1 further comprises: suppressing, at least in part based on the determination, sending the copy of the first interlace for the side link feedback associated with the first side link message via the second side link feedback resource set of the side link feedback symbol, wherein the second side link feedback resource set of the side link feedback symbol is occupied by the additional first interlace for the side link feedback associated with the second side link message.

[0230] Aspect 7. The method according to aspect 6, wherein the sidelink feedback satisfies a channel occupancy threshold of the sidelink feedback symbol on the unlicensed channel.

[0231] Aspect 8. The method according to aspects 1 to 7, the method further comprising: receiving configuration information including parameters at least for the interleaving mapping rule, the replica mapping rule, or both, wherein the mapping is based at least in part on the parameters.

[0232] Aspect 9. The method according to Aspects 1 to 8 further comprises: monitoring the unlicensed channel for the one or more side link messages, wherein the detection is at least partially based on the monitoring, and wherein at least one of the one or more side link messages is addressed to one or more additional UEs.

[0233] Aspect 10. The method according to aspects 1 to 9, wherein the mapping is based at least in part on the interlace mapping rule and a broadcast type of the first sidelink message.

[0234] Aspect 11. A method according to aspect 10, wherein sending the sidelink feedback comprises: sending a sidelink feedback message associated with the first sidelink message via a first set of multiple physical resource blocks of the first staggered for sidelink feedback, the sidelink feedback message comprising an acknowledgment message or a negative acknowledgment message, wherein the first sidelink message comprises a unicast broadcast type addressed to the UE.

[0235] Aspect 12. A method according to aspect 10, wherein sending the sidelink feedback includes: sending a sidelink feedback message associated with the first sidelink message via a first set of multiple physical resource blocks of the first interlace for sidelink feedback, the sidelink feedback message including a negative acknowledgement message indicating that the UE failed to decode the first sidelink message, wherein the first sidelink message includes a multicast broadcast type addressed to multiple UEs including the UE, and wherein the first set of multiple physical resource blocks is allocated to the multiple UEs for sending the sidelink feedback according to the interlace mapping rule.

[0236] Aspect 13. A method according to aspect 10, wherein sending the sidelink feedback comprises: sending a sidelink feedback message associated with the first sidelink message via a first set of multiple physical resource blocks of the first interlace for sidelink feedback, the sidelink feedback message comprising an acknowledgment message or a negative acknowledgment message, wherein the first sidelink message comprises a multicast broadcast type addressed to multiple UEs including the UE, and wherein the first set of the multiple physical resource blocks of the first interlace is allocated to each of the multiple UEs for sending the sidelink feedback according to the interlace mapping rule.

[0237] Aspect 14. The method according to aspects 1 to 13, wherein the first interlace used for sidelink feedback comprises a plurality of physical resource blocks that are consecutive in frequency.

[0238] Aspect 15. The method according to aspects 1 to 13, wherein the first interlace used for sidelink feedback comprises a plurality of physical resource blocks that are non-contiguous in frequency.

[0239] Aspect 16. The method according to aspects 1 to 13, wherein the first interlace used for sidelink feedback includes multiple corresponding physical resource blocks associated with a single cyclic shift.

[0240] Aspect 17. The method according to aspects 1 to 13, wherein the first interlace used for sidelink feedback includes multiple corresponding physical resource blocks associated with multiple cyclic shifts.

[0241] Aspect 18. A method for performing wireless communications at a UE, the method comprising: sending one or more side link messages on an unlicensed channel, the one or more side link messages sharing a common side link feedback symbol; mapping a first set of side link feedback resources of a first interlace in one or more interlaces for each side link feedback associated with the one or more side link messages according to an interlace mapping rule associated with the side link feedback resources of the common side link feedback symbol; and receiving side link feedback associated with a first side link message in the one or more side link messages via the first interlace during the side link feedback symbol according to the mapping.

[0242] Aspect 19. The method according to aspect 18, the method further comprising: receiving configuration information including at least parameters for the interleaving mapping rule, the replica mapping rule, or both, wherein the mapping is based at least in part on the parameters.

[0243] Aspect 20. The method according to Aspects 18 to 19, further comprising: mapping the first side link feedback resource set of the first interlace for each side link feedback associated with the one or more side link messages based at least in part on the interlace mapping rule and the broadcast type of the first side link message; and monitoring the first interlace for each side link feedback associated with the one or more side link messages based at least in part on the mapping, wherein receiving the side link feedback associated with the first side link message is based at least in part on the monitoring.

[0244] Aspect 21. A method according to Aspect 20, wherein receiving the sidelink feedback comprises: receiving a sidelink feedback message associated with the first sidelink message via a first set of multiple physical resource blocks of the first staggered portion for sidelink feedback, the sidelink feedback message comprising a confirmation message or a negative confirmation message, wherein the first sidelink message comprises a unicast broadcast type.

[0245] Aspect 22. A method according to aspect 20, wherein receiving the sidelink feedback includes: receiving at least one sidelink feedback message associated with the first sidelink message via a first set of multiple physical resource blocks of the first interlace for sidelink feedback, the sidelink feedback message including a negative confirmation message indicating that at least one UE of a plurality of UEs failed to decode the first sidelink message, wherein the first sidelink message includes a multicast broadcast type addressed to the plurality of UEs, and wherein the first set of physical resource blocks is allocated to the plurality of UEs for sending the sidelink feedback according to the interlace mapping rule.

[0246] Aspect 23. A method according to aspect 20, wherein receiving the sidelink feedback comprises: receiving a sidelink feedback message associated with the first sidelink message via a first set of multiple physical resource blocks of the first interlace for sidelink feedback, the sidelink feedback message comprising an acknowledgment message or a negative acknowledgment message, wherein the first sidelink message comprises a multicast broadcast type addressed to multiple UEs, and wherein the first set of multiple physical resource blocks is allocated to corresponding UEs among the multiple UEs for sending the sidelink feedback according to the interlace mapping rule.

[0247] Aspect 24. The method according to aspects 18 to 23, wherein the first interlace used for sidelink feedback comprises a plurality of physical resource blocks that are consecutive in frequency.

[0248] Aspect 25. The method according to aspects 18 to 23, wherein the first interlace used for sidelink feedback comprises a plurality of physical resource blocks that are non-contiguous in frequency.

[0249] Aspect 26. A method according to aspects 18 to 23, wherein the first interlace used for sidelink feedback comprises a plurality of respective physical resource blocks associated with a single cyclic shift.

[0250] Aspect 27. A method according to aspects 18 to 23, wherein the first interlace used for sidelink feedback comprises a plurality of corresponding physical resource blocks associated with a plurality of cyclic shifts.

[0251] It should be noted that the methods described herein describe possible implementations, and that the various operations and steps may be rearranged or otherwise modified and that other implementations are possible. Furthermore, aspects from two or more methods may be combined.

[0252] Although aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for example purposes, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein may also be applicable to networks other than LTE, LTE-A, LTE-A Pro, or NR networks. For example, the described techniques may be applicable to various other wireless communication systems, such as Ultra Mobile Broadband (UMB), Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, and other systems and radio technologies not explicitly mentioned herein.

[0253] The information and signals described herein may be represented using any of a variety of different techniques and methods. For example, data, instructions, commands, information, signals, bits, symbols, and chips mentioned throughout the specification may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or optical particles, or any combination thereof.

[0254] The various illustrative blocks and components described in conjunction with the disclosure herein may be implemented or performed using a general purpose processor, DSP, ASIC, CPU, FPGA or other programmable logic device, discrete gate or transistor logic components, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in an alternative, the processor 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 in conjunction with a DSP core, or any other such configuration).

[0255] The functions described herein may be implemented using hardware, software executed by a processor, firmware, or any combination thereof. If implemented using software executed by a processor, the functions may be stored as one or more instructions or codes of a computer-readable medium, or sent using one or more instructions or codes of a computer-readable medium. Other examples and specific implementations are within the scope of the present disclosure and the appended claims. For example, due to the nature of software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hard wiring, or any combination of these items. Features that implement the functions may also be physically located at different locations, including being distributed so that the various parts of the functions are implemented at different physical locations.

[0256] Computer-readable medium includes both non-transient computer storage medium and communication medium, and the communication medium includes any medium that promotes computer program to be transferred from one position to another position.Non-transient storage medium can be any available medium that can be accessed by general or special-purpose computer.By way of example and not limitation, non-transient computer-readable medium can include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, compact disc (CD) ROM or other optical disc storage device, disk storage device or other magnetic storage device or can be used for carrying or storing desired program code parts and any other non-transient medium that can be accessed by general or special-purpose computer or general or special-purpose processor in the form of instruction or data structure.In addition, any connection is appropriately referred to as computer-readable medium.For example, if software is sent from website, server or other remote source using coaxial cable, optical fiber cable, twisted pair, digital subscriber line (DSL) or wireless technology such as infrared, radio and microwave, then coaxial cable, optical fiber cable, twisted pair, DSL or wireless technology such as infrared, radio and microwave are included in the definition of computer-readable medium. Disks and optical disks used herein include CDs, laser optical disks, optical optical disks, digital versatile disks (DVDs), floppy disks, and Blu-ray disks. Disks can reproduce data magnetically, and optical disks can reproduce data optically using lasers. Combinations of the above are also included within the scope of computer-readable media.

[0257] As used herein (including in the claims), "or" used in a list of items (e.g., a list of items with a phrase such as "at least one of" or "one or more of") indicates an inclusive list, so 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). In addition, as used herein, the phrase "based on" should not be interpreted as a reference to a closed set of conditions. For example, an example step described as "based on condition A" can be based on condition A and condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "based at least in part on."

[0258] The term "determining" encompasses a variety of actions, and thus, "determining" may include calculating, computing, processing, deriving, investigating, looking up (such as via looking up in a table, database or other data structure), ascertaining, and the like. Additionally, "determining" may include receiving (e.g., receiving information) and accessing (e.g., accessing data stored in a memory), etc. Additionally, "determining" may include parsing, obtaining, selecting, choosing, establishing, and other such similar actions.

[0259] In the drawings, similar components or features may have the same reference label. In addition, various components of the same type may be distinguished by following the reference label with a dash and a second label to distinguish between the similar components. If only the first reference label is used in the specification, the description may apply to any of the similar components having the same first reference label regardless of the second reference label or other subsequent reference labels.

[0260] The descriptions set forth herein in conjunction with the accompanying drawings describe example configurations and do not represent all examples that may be implemented or within the scope of the claims. The term "example" as used herein means "used as an example, instance, or illustration" and does not mean "preferred" or "having advantages over other examples". The specific implementation includes specific details to provide an understanding of the technology. However, the technologies may 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 examples.

[0261] The description herein is provided to enable one of ordinary skill in the art to implement or use the present disclosure. Various modifications to the present disclosure will be apparent to one of ordinary skill in the art, and the general principles defined herein may be applied to other variations without departing from the scope of the present disclosure. Therefore, the present 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. An apparatus for wireless communication at a user equipment (UE), the apparatus comprising: processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to: detecting one or more sidelink messages on an unlicensed channel, the one or more sidelink messages sharing a common sidelink feedback symbol; mapping a first set of sidelink feedback resources of a first interlace of the one or more interlaces for each sidelink feedback associated with the one or more sidelink messages in accordance with an interlace mapping rule associated with the sidelink feedback resources of the common sidelink feedback symbol; determining whether to allocate a second set of sidelink feedback resources of a second interlace of the one or more interlaces for sidelink feedback associated with a first sidelink message of the one or more sidelink messages based at least in part on: whether the second interlace overlaps with an additional first interlace of the one or more interlaces used for the sidelink feedback associated with a second sidelink message of the one or more sidelink messages, wherein the second interlace is a copy of the first interlace associated with the first sidelink message, and wherein the first sidelink message is addressed to the UE; as well as According to the mapping and based at least in part on the determination, sidelink feedback associated with the first sidelink message is transmitted via the first interlace during the sidelink feedback symbol.

2. The apparatus of claim 1 , wherein the instructions are further executable by the processor to cause the apparatus to: The sidelink feedback associated with the first sidelink message is transmitted via the copy of the first interlace during the sidelink feedback symbol based at least in part on the determination, wherein the copy of the first interlace for the sidelink feedback associated with the first sidelink message does not overlap with the additional first interlace for the sidelink feedback associated with the second sidelink message.

3. The apparatus of claim 2, wherein the instructions are further executable by the processor to cause the apparatus to: The repetition of the first interlace for the sidelink feedback associated with the first sidelink message is mapped to a second sidelink feedback resource set of the sidelink feedback symbols according to a repetition mapping rule, wherein the determining is based at least in part on the mapping.

4. The apparatus of claim 3, wherein the replica mapping rule comprises an offset value indicating a number of frequency resources of the sidelink feedback symbol between the first sidelink feedback resource set and the second sidelink feedback resource set of the sidelink feedback symbol.

5. The apparatus of claim 2, wherein the first interlace and the copy of the first interlace used for the sidelink feedback associated with the first sidelink message satisfy a channel occupancy threshold for the sidelink feedback symbol on the unlicensed channel.

6. The apparatus of claim 1, wherein the instructions are further executable by the processor to cause the apparatus to: and suppressing, based at least in part on the determination, transmitting the copy of the first interlace for the sidelink feedback associated with the first sidelink message via the second set of sidelink feedback resources of the sidelink feedback symbols, wherein the second set of sidelink feedback resources of the sidelink feedback symbols is occupied by the additional first interlace for the sidelink feedback associated with the second sidelink message.

7. The apparatus of claim 6, wherein the sidelink feedback satisfies a channel occupancy threshold for the sidelink feedback symbol on the unlicensed channel.

8. The apparatus of claim 1, wherein the instructions are further executable by the processor to cause the apparatus to: Configuration information including at least parameters for the interleave mapping rule, the replica mapping rule, or both is received, wherein the mapping is based at least in part on the parameters.

9. The apparatus of claim 1, wherein the instructions are further executable by the processor to cause the apparatus to: The unlicensed channel is monitored for the one or more sidelink messages, wherein the detecting is based at least in part on the monitoring, and wherein at least one sidelink message of the one or more sidelink messages is addressed to one or more additional UEs.

10. The apparatus of claim 1, wherein the mapping is based at least in part on the interlace mapping rule and a broadcast type of the first sidelink message.

11. The apparatus of claim 10, wherein the instructions for sending the sidelink feedback are executable by the processor to cause the apparatus to: A sidelink feedback message associated with the first sidelink message is sent via a first set of a plurality of physical resource blocks of the first interlace for sidelink feedback, the sidelink feedback message comprising an acknowledgement message or a negative acknowledgement message, wherein the first sidelink message comprises a unicast broadcast type addressed to the UE.

12. The apparatus of claim 10, wherein the instructions for sending the sidelink feedback are executable by the processor to cause the apparatus to: transmitting a sidelink feedback message associated with the first sidelink message via a first set of a plurality of physical resource blocks of the first interlace for sidelink feedback, the sidelink feedback message comprising a negative acknowledgement message indicating that the UE failed to decode the first sidelink message, wherein the first sidelink message comprises a multicast broadcast type addressed to a plurality of UEs including the UE, and wherein the first set of a plurality of physical resource blocks is allocated to the plurality of UEs for transmitting the sidelink feedback according to the interlace mapping rule.

13. The apparatus of claim 10, wherein the instructions for sending the sidelink feedback are executable by the processor to cause the apparatus to: sending a sidelink feedback message associated with the first sidelink message via a first set of a plurality of physical resource blocks of the first interlace for sidelink feedback, the sidelink feedback message comprising an acknowledgement message or a negative acknowledgement message, wherein the first sidelink message comprises a multicast broadcast type addressed to a plurality of UEs including the UE, and wherein the first set of the plurality of physical resource blocks of the first interlace is allocated to each of the plurality of UEs for sending the sidelink feedback according to the interlace mapping rule.

14. The apparatus of claim 1, wherein the first interlace for sidelink feedback comprises a plurality of physical resource blocks that are contiguous in frequency.

15. The apparatus of claim 1, wherein the first interlace for sidelink feedback comprises a plurality of physical resource blocks that are non-contiguous in frequency.

16. The apparatus of claim 1, wherein the first interlace for sidelink feedback comprises a plurality of respective physical resource blocks associated with a single cyclic shift.

17. The apparatus of claim 1, wherein the first interlace for sidelink feedback comprises a plurality of respective physical resource blocks associated with a plurality of cyclic shifts.

18. An apparatus for wireless communication at a user equipment (UE), the apparatus comprising: processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to: transmitting one or more sidelink messages on an unlicensed channel, the one or more sidelink messages sharing a common sidelink feedback symbol; mapping a first set of sidelink feedback resources of a first interlace of the one or more interlaces for each sidelink feedback associated with the one or more sidelink messages in accordance with an interlace mapping rule associated with the sidelink feedback resources of the common sidelink feedback symbol; as well as Sidelink feedback associated with a first sidelink message of the one or more sidelink messages is received via the first interlace during the sidelink feedback symbol according to the mapping.

19. The apparatus of claim 18, wherein the instructions are further executable by the processor to cause the apparatus to: Configuration information including at least parameters for the interleave mapping rule, the replica mapping rule, or both is received, wherein the mapping is based at least in part on the parameters.

20. The apparatus of claim 18, wherein the instructions are further executable by the processor to cause the apparatus to: mapping the first set of sidelink feedback resources of the first interlace for each sidelink feedback associated with the one or more sidelink messages based at least in part on the interlace mapping rule and a broadcast type of the first sidelink message; and The first interlace is monitored for each sidelink feedback associated with the one or more sidelink messages based at least in part on the mapping, wherein receiving the sidelink feedback associated with the first sidelink message is based at least in part on the monitoring.

21. The apparatus of claim 20, wherein the instructions for receiving the sidelink feedback are executable by the processor to cause the apparatus to: A sidelink feedback message associated with the first sidelink message is received via a first set of multiple physical resource blocks of the first interlace for sidelink feedback, the sidelink feedback message comprising an acknowledgement message or a negative acknowledgement message, wherein the first sidelink message comprises a unicast broadcast type.

22. The apparatus of claim 20, wherein the instructions for receiving the sidelink feedback are executable by the processor to cause the apparatus to: receiving at least one sidelink feedback message associated with the first sidelink message via a first set of a plurality of physical resource blocks of the first interlace for sidelink feedback, the sidelink feedback message comprising a negative acknowledgement message indicating that at least one UE of a plurality of UEs failed to decode the first sidelink message, wherein the first sidelink message comprises a multicast broadcast type addressed to the plurality of UEs, and wherein the first set of physical resource blocks are allocated to the plurality of UEs for sending the sidelink feedback according to the interlace mapping rule.

23. The apparatus of claim 20, wherein the instructions for receiving the sidelink feedback are executable by the processor to cause the apparatus to: receiving a sidelink feedback message associated with the first sidelink message via a first set of a plurality of physical resource blocks of the first interlace for sidelink feedback, the sidelink feedback message comprising an acknowledgment message or a negative acknowledgment message, wherein the first sidelink message comprises a multicast broadcast type addressed to a plurality of UEs, and wherein the first set of a plurality of physical resource blocks is allocated to respective UEs of the plurality of UEs for sending the sidelink feedback according to the interlace mapping rule.

24. The apparatus of claim 18, wherein the first interlace for sidelink feedback comprises a plurality of physical resource blocks that are contiguous in frequency.

25. The apparatus of claim 18, wherein the first interlace used for sidelink feedback comprises a plurality of physical resource blocks that are non-contiguous in frequency.

26. The apparatus of claim 18, wherein the first interlace for sidelink feedback comprises a plurality of respective physical resource blocks associated with a single cyclic shift.

27. The apparatus of claim 18, wherein the first interlace for sidelink feedback comprises a plurality of respective physical resource blocks associated with a plurality of cyclic shifts.

28. A method for wireless communication at a user equipment (UE), the method comprising: detecting one or more sidelink messages on an unlicensed channel, the one or more sidelink messages sharing a common sidelink feedback symbol; mapping a first set of sidelink feedback resources of a first interlace of the one or more interlaces for each sidelink feedback associated with the one or more sidelink messages according to an interlace mapping rule associated with the sidelink feedback resources of the common sidelink feedback; determining whether to allocate a second set of sidelink feedback resources of a second interlace of the one or more interlaces for sidelink feedback associated with a first sidelink message of the one or more sidelink messages based at least in part on whether the second interlace overlaps with an additional first interlace used for the sidelink feedback associated with a second sidelink message of the one or more sidelink messages, wherein the second interlace is a copy of the first interlace associated with the first sidelink message; as well as According to the mapping and based at least in part on the determination, sidelink feedback associated with the first sidelink message is transmitted via the first interlace during the sidelink feedback symbol.

29. The method according to claim 28, further comprising: The sidelink feedback associated with the first sidelink message is transmitted via the copy of the first interlace during the sidelink feedback symbol based at least in part on the determination, wherein the copy of the first interlace for the sidelink feedback associated with the first sidelink message does not overlap with the additional first interlace for the sidelink feedback associated with the second sidelink message.

30. A method for wireless communication at a user equipment (UE), the method comprising: transmitting one or more sidelink messages on an unlicensed channel, the one or more sidelink messages sharing a common sidelink feedback symbol; mapping a first set of sidelink feedback resources of a first interlace of the one or more interlaces for each sidelink feedback associated with the one or more sidelink messages in accordance with an interlace mapping rule associated with the sidelink feedback resources of the common sidelink feedback symbol; as well as Sidelink feedback associated with a first sidelink message of the one or more sidelink messages is received via the first interlace during the sidelink feedback symbol according to the mapping.

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