Sidelink feedback for increased capacity

Abstract

Methods, systems, and devices for wireless communication are described. In general, the described techniques allow a user equipment (UE) to transmit feedback information via a configurable number of interleaving resource blocks (IRBs) in one or more interlaces of a sidelink feedback channel. For example, the UE may transmit feedback via interleaved multiple IRBs. The UE may determine which IRBs to use according to a configuration that may indicate a number of IRBs, a distribution of the IRBs, a pattern of the IRBs, or any combination thereof. Additionally or alternatively, the UE may determine to transmit feedback via a plurality of IRBs different from the common interleaving.

Description

[0001] Cross-references

[0002] This patent application claims priority to U.S. patent application No. 17 / 958,042, entitled “SIDELINK FEEDBACK FOR INCREASED CAPACITY,” filed by Liu et al. on September 20, 2022, which is assigned to the assignee of this application and is expressly incorporated herein by reference. Technical Field

[0003] The following relates to wireless communications, including sidelink feedback for increased capacity. Background Art

[0004] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcast, etc. 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 communication of a communication device, which may be referred to as a user equipment (UE).

[0005] Some wireless communication systems may support sidelink communications between one or more wireless devices (e.g., UEs). In some examples, a UE communicating via a sidelink may select resources from resources included in a sidelink feedback channel (e.g., a physical sidelink feedback channel (PSFCH)) and utilize the selected resources to receive a feedback message in response to a previously received sidelink message. Summary of the invention

[0006] The described technology relates to improved methods, systems, devices and apparatuses for supporting sidelink feedback for increasing capacity. For example, the described technology enables a user equipment (UE) to send feedback information via a configurable number of interleaved resource blocks (IRBs) in one or more interlaces of a sidelink feedback channel. For example, the UE may send feedback via multiple interleaved IRBs, which may increase the allowable transmit power for feedback transmission. In such an example, the UE may determine which IRBs to use based on a configuration, which may indicate the number of IRBs, the distribution of IRBs, the pattern of IRBs, or any combination thereof. Additionally or alternatively, the UE may determine to send feedback via multiple IRBs that are interleaved differently from the public interleaving. That is, the UE may send feedback via a first interleaved IRB offset from the public interleaved IRB, which may increase the transmit power for feedback information. In some cases, the UE may reduce the transmit power for the public IRB, the IRB carrying feedback, or both to avoid exceeding the power spectral density (PSD) limit.

[0007] A method for wireless communication at a first UE is described. The method may include receiving a sidelink message from a second UE via a set of resources of a sidelink channel; generating a set of multiple feedback indications based at least on the sidelink message; and sending the set of multiple feedback indications to the second UE via the sidelink feedback channel and via one or more configurable resources according to an interleaving, the interleaved indications including a set of multiple frequency resources of the one or more configurable resources, wherein the set of multiple frequency resources is evenly distributed across a bandwidth of the sidelink feedback channel.

[0008] An apparatus for wireless communication at a first UE is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to receive a sidelink message from a second UE via a set of resources of a sidelink channel; generate a set of multiple feedback indications based at least on the sidelink message; and send a set of multiple feedback indications to the second UE via the sidelink feedback channel and via one or more configurable resources according to an interleaving, the interleaved indications including a set of multiple frequency resources of the one or more configurable resources, wherein the set of multiple frequency resources is evenly distributed across a bandwidth of the sidelink feedback channel.

[0009] Another apparatus for wireless communication at a first UE is described. The apparatus may include means for receiving a sidelink message from a second UE via a set of resources of a sidelink channel; means for generating a set of multiple feedback indications based at least on the sidelink message; and means for sending the set of multiple feedback indications to the second UE via the sidelink feedback channel and via one or more configurable resources according to an interleaving, the interleaved indications including a set of multiple frequency resources of the one or more configurable resources, wherein the set of multiple frequency resources is evenly distributed across a bandwidth of the sidelink feedback channel.

[0010] A non-transitory computer-readable medium storing code for wireless communication at a first UE is described. The code may include instructions executable by a processor to: receive a sidelink message from a second UE via a set of resources of a sidelink channel; generate a set of multiple feedback indications based at least on the sidelink message; and send a set of multiple feedback indications to the second UE via the sidelink feedback channel and via one or more configurable resources according to an interleaving, the interleaved indications including a set of multiple frequency resources of the one or more configurable resources, wherein the set of multiple frequency resources is evenly distributed across a bandwidth of the sidelink feedback channel.

[0011] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for sending a first number of feedback indications at a first time and at a first transmit power via one or more configurable resources and sending a second number of feedback indications at a second time and at a second transmit power via one or more configurable resources, wherein the first number may be the same number as the second number and the first transmit power may be lower than the second transmit power.

[0012] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending a set of multiple feedback indications may include operations, features, components, or instructions for the following actions: sending each feedback indication in the set of multiple feedback indications via a first cyclic shift pair in a first set of multiple cyclic shift pairs via a corresponding frequency resource in one or more configurable resources, wherein each frequency resource in the set of multiple frequency resources includes a set of multiple cyclic shift pairs corresponding to a set of multiple cyclic shift pair indices.

[0013] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending a set of multiple feedback indications via one or more configurable resources may include operations, features, components, or instructions for the following actions: sending one or more dummy signals via a remaining number of frequency resources in a set of multiple frequency resources, wherein each of the one or more dummy signals may be sent via a second cyclic shift pair in a second set of multiple cyclic shift pairs associated with a corresponding frequency resource in the remaining number of frequency resources, wherein the second cyclic shift pair may be a first reserved cyclic shift pair for sending the dummy signal.

[0014] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a cyclic shift pair index of a first reserved cyclic shift pair for a corresponding frequency resource may be offset from a cyclic shift pair index of a second reserved cyclic shift pair for a subsequent frequency resource in a set of multiple frequency resources.

[0015] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving a message including an indication of a number of feedback indications to be sent, a pattern associated with a set of multiple frequency resources, or both, wherein a set of multiple feedback indications may be sent based on the message.

[0016] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the side link channel includes a set of multiple interlaces, and the set of multiple frequency resources can be associated with a first interlace in the set of multiple interlaces, and the methods, apparatus, and non-transitory computer-readable media can include additional operations, features, components, or instructions for the following actions: sending a set of multiple feedback indications via a first interlace in the set of multiple interlaces that can be different from a second interlace in the set of multiple interlaces, where the second interlace can be a common interlace.

[0017] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for the following actions: based on the number of frequency resources between a first frequency resource in one or more configurable resources for a feedback indication in a set of multiple feedback indications and a second frequency resource for a dummy signal associated with a second interlace exceeding a threshold number of frequency resources, sending the feedback indication, the dummy signal, or both according to a transmission power that may be lower than a threshold power.

[0018] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, an interlace includes a set of multiple interlaces, and a set of multiple frequency resources may be associated with a first interlace in the set of multiple interlaces, and the methods, apparatus, and non-transitory computer-readable media may include additional operations, features, components, or instructions for the following actions: sending a set of multiple feedback indications via the first interlace, the second interlace, or both, where the second interlace may be a common interlace.

[0019] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for: sending a set of multiple feedback indications via a first subset of a set of multiple frequency resources, wherein the first subset includes one or more configurable resources; and sending one or more dummy signals via remaining frequency resources in the first subset, via one or more frequency resources in a second subset of the set of multiple frequency resources, or both.

[0020] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving an indication to send a set of multiple feedback indications via a first resource pool or a second resource pool, wherein the first resource pool may be a default resource pool and the second resource pool may be a capacity enhancement resource pool.

[0021] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the first resource pool and the second resource pool may be multiplexed across the bandwidth of the side link channel according to a frequency division multiplexing scheme, a time division multiplexing scheme, a code division multiplexing scheme, or any combination thereof.

[0022] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the indication may be received via a downlink control information message, a medium access control control element, or a radio resource control message.

[0023] A method for wireless communication at a first UE is described. The method may include sending a sidelink message to at least a second UE via a set of resources of a sidelink channel; and receiving a set of multiple feedback indications associated with the sidelink message from the second UE via one or more configurable resources via a sidelink feedback channel according to an interleaving, the interleaving indications including a set of multiple frequency resources of the one or more configurable resources, wherein the set of multiple frequency resources is evenly distributed across a bandwidth of the sidelink feedback channel.

[0024] An apparatus for wireless communication at a first UE is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to send a sidelink message to at least a second UE via a set of resources of a sidelink channel; and receive a set of multiple feedback indications associated with the sidelink message from the second UE via one or more configurable resources via a sidelink feedback channel according to an interleaving, the interleaving indications including a set of multiple frequency resources of the one or more configurable resources, wherein the set of multiple frequency resources is evenly distributed across a bandwidth of the sidelink feedback channel.

[0025] Another apparatus for wireless communication at a first UE is described. The apparatus may include means for sending a sidelink message to at least a second UE via a set of resources of a sidelink channel; and means for receiving a set of multiple feedback indications associated with the sidelink message from the second UE via one or more configurable resources via a sidelink feedback channel according to an interleaving, the interleaving indications including a set of multiple frequency resources of the one or more configurable resources, wherein the set of multiple frequency resources is evenly distributed across a bandwidth of the sidelink feedback channel.

[0026] A non-transitory computer-readable medium storing code for wireless communication at a first UE is described. The code may include instructions executable by a processor to perform the following operations: sending a sidelink message to at least a second UE via a set of resources of a sidelink channel; and receiving a set of multiple feedback indications associated with the sidelink message from the second UE via one or more configurable resources via a sidelink feedback channel according to an interleaving, the interleaving indication including a set of multiple frequency resources of the one or more configurable resources, wherein the set of multiple frequency resources is evenly distributed across a bandwidth of the sidelink feedback channel.

[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 a first number of feedback indications at a first time and at a first power via one or more configurable resources and receiving a second number of feedback indications at a second time and at a second power via one or more configurable resources, wherein the first number may be less than the second number and the first power may be lower than the second power.

[0028] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving a set of multiple feedback indications may include operations, features, components, or instructions for the following actions: receiving each feedback indication in the set of multiple feedback indications via a first cyclic shift pair in a set of multiple cyclic shift pairs for a corresponding frequency resource in a set of multiple frequency resources, wherein each frequency resource in the set of multiple frequency resources includes a set of multiple cyclic shift pairs corresponding to a set of multiple cyclic shift pair indices.

[0029] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving a set of multiple feedback indications via one or more configurable resources may include operations, features, components, or instructions for the following actions: receiving one or more dummy signals via a remaining number of frequency resources in a set of multiple frequency resources, wherein each of the one or more dummy signals may be received via a second cyclic shift pair in a second set of multiple cyclic shift pairs associated with a corresponding frequency resource in the remaining number of frequency resources, wherein the second cyclic shift pair may be a first reserved cyclic shift pair for conveying the dummy signal.

[0030] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a first cyclic shift pair index of a first reserved cyclic shift pair of a corresponding frequency resource can be offset from a second cyclic shift pair index of a second reserved cyclic shift pair of a subsequent frequency resource in a set of multiple frequency resources.

[0031] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for sending a message including an indication of a number of feedback indications to be sent to a second UE, a pattern associated with a set of multiple frequency resources, or both, wherein receiving a set of multiple feedback indications may be based on sending the message.

[0032] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the side link channel includes a set of multiple interlaces, and the set of multiple frequency resources can be associated with a first interlace in the set of multiple interlaces, and the methods, apparatus, and non-transitory computer-readable media can include additional operations, features, components, or instructions for the following actions: receiving a set of multiple feedback indications via a first interlace that can be different from a second interlace in the set of multiple interlaces, where the second interlace can be a common interlace.

[0033] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for the following actions: based on the number of frequency resources between a first frequency resource in one or more configurable resources for a feedback indication in a set of multiple feedback indications and a second frequency resource for a dummy signal associated with a second interlace exceeding a threshold number of frequency resources, receiving the feedback indication, the dummy signal, or both according to a power that may be less than a threshold power.

[0034] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, an interlace includes a set of multiple interlaces, and a set of multiple frequency resources may be associated with a first interlace in the set of multiple interlaces, and the methods, apparatus, and non-transitory computer-readable media may include additional operations, features, components, or instructions for the following actions: receiving a set of multiple feedback indications via the first interlace, the second interlace, or both, where the second interlace may be a common interlace.

[0035] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for: receiving a set of multiple feedback indications via a first subset of a set of multiple frequency resources, wherein the first subset includes one or more configurable resources; and receiving one or more dummy signals via remaining frequency resources in the first subset, via one or more frequency resources in a second subset of the set of multiple frequency resources, or both.

[0036] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for the following actions: sending an indication to a second UE to send a set of multiple feedback indications via a first resource pool or a second resource pool, wherein the first resource pool may be a default resource pool and the second resource pool may be a capacity enhancement resource pool.

[0037] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the first resource pool and the second resource pool may be multiplexed across the bandwidth of the side link channel according to a frequency division multiplexing scheme, a time division multiplexing scheme, a code division multiplexing scheme, or any combination thereof.

[0038] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the indication may be sent via a downlink control information message, a medium access control control element, or a radio resource control message. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 An example of a wireless communication system supporting sidelink feedback for increasing capacity according to one or more aspects of the present disclosure is illustrated.

[0040] Figure 2 An example of a wireless communication system supporting sidelink feedback for increasing capacity according to one or more aspects of the present disclosure is illustrated.

[0041] Figure 3 An example of an interleaving configuration supporting sidelink feedback for increased capacity according to one or more aspects of the present disclosure is illustrated.

[0042] Figure 4 An example of an interleaved resource block configuration supporting sidelink feedback for increased capacity in accordance with one or more aspects of the present disclosure is illustrated.

[0043] Figure 5 An example of a process flow for supporting sidelink feedback for increasing capacity in accordance with one or more aspects of the present disclosure is illustrated.

[0044] Figure 6 and Figure 7 A block diagram of an apparatus supporting sidelink feedback for increasing capacity according to one or more aspects of the present disclosure is shown.

[0045] Figure 8 A block diagram of a communications manager supporting sidelink feedback for increased capacity is shown in accordance with one or more aspects of the present disclosure.

[0046] Fig. 9 A diagram of a system including a device supporting sidelink feedback for increasing capacity is shown in accordance with one or more aspects of the present disclosure.

[0047] Figures 10 to 15 A flow chart illustrating a method of supporting sidelink feedback for increasing capacity according to one or more aspects of the present disclosure is shown. DETAILED DESCRIPTION

[0048] In some wireless communication systems, multiple user equipments (UEs) can communicate directly with each other in a sidelink communication mode. For example, a transmitting sidelink UE can send data to one or more other sidelink UEs via a sidelink data channel (e.g., a physical sidelink shared channel (PSSCH) or a physical sidelink control channel (PSCCH)). In response to the data transmission, the receiving UE can send an indication of whether the data transmission is successfully received, such as a hybrid automatic repeat request (HARQ) confirmation (HARQ-ACK) or a HARQ negative confirmation (HARQ-NACK) via a sidelink feedback channel (e.g., a physical sidelink feedback channel (PSFCH)) corresponding to the sidelink data channel. In some examples, the frequency resources (e.g., resource blocks (RBs)) of the PSFCH can be divided into resource sets based on the number of subchannels and the number of time slots of the PSSCH associated with the PSFCH. Therefore, the receiving UE can determine the PSFCH resources for sending feedback based on the identifier of the transmitting UE and the identifier of the receiving UE. However, such techniques may result in an occupied channel bandwidth (OCB) that does not meet the OCB threshold (e.g., 80% occupancy of the PSFCH bandwidth). That is, the size of the feedback payload (eg, 1 bit for feedback such as ACK or NACK) may result in a relatively small percentage of the PSFCH RBs being used for transmission.

[0049] Alternatively, the PSFCH may be extended using an interleaved waveform configuration (e.g., to satisfy an OCB constraint). In such a configuration, one or more interleavings of an interleaved RB (IRB) may be defined over the bandwidth of the PSFCH. An interleaving in one or more interleavings may include a certain number of IRBs (e.g., 10 IRBs) evenly distributed over the entire bandwidth of the PSFCH. In some examples, such as when a relatively large number of receiving UEs are sending feedback information via the PSFCH, the receiving UE may identify one or more common resources (e.g., common interleavings), one or more dedicated resources, or both for sending feedback. For example, the receiving UEs may each send feedback via an IRB of a first interleaving (e.g., concurrently), and may additionally send feedback via a dedicated PRB. Additionally or alternatively, the receiving UE may send feedback via one IRB of an interleaving and may send a dummy signal (e.g., useless information, known information) via the remaining IRBs (e.g., at a location where another UE may be transmitting). However, in some cases, such an approach may result in an irregular PSFCH waveform, may result in limited transmit power for feedback transmission, may be sensitive to devices transmitting in close proximity, or any combination thereof.

[0050] To enhance interleaved PSFCH transmission, the UE may send feedback information via a configurable number of IRBs in one or more interlaces. For example, the UE may be configured to send feedback via multiple IRBs of an interlace, which may increase the allowable transmit power for feedback transmission. In such an example, the UE may determine which IRBs to use based on a configuration, which may indicate the number of IRBs, the distribution of IRBs (e.g., distributed across interlaces or continuous within an interlace), the pattern of IRBs, or any combination thereof. Additionally or alternatively, the UE may determine to send feedback via multiple IRBs of an interlace different from a common interlace. That is, the UE may send feedback via an IRB of a first interlace offset from an IRB of a common interlace, which may increase the transmit power for feedback information. In some cases, the UE may reduce the transmit power for a common IRB, an IRB carrying feedback, or both, to avoid exceeding a power spectral density (PSD) limit.

[0051] First, various aspects of the disclosure are described in the context of a wireless communication system. Various aspects of the disclosure are further illustrated and described with reference to interleaving configurations, interleaving RB configurations, and process flows. Various aspects of the disclosure are further illustrated and described by and with reference to apparatus diagrams, system diagrams, and flow diagrams related to sidelink feedback for increasing capacity.

[0052] Figure 1 An example of a wireless communication system 100 supporting sidelink feedback for increasing capacity 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).

[0053] 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 various examples, the network entities 105 may be referred to as network elements, mobility elements, radio access network (RAN) nodes, or network equipment, among other names. 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) within 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 within which the network entity 105 and the UE 115 may support signal communications according to one or more radio access technologies (RATs).

[0054] 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 both 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.

[0055] 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 a network node. For example, a 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.

[0056] 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 directly (e.g., directly between the network entities 105) or indirectly (e.g., via the core network 130) via the backhaul communication links 120 (e.g., according to X2, Xn, or other interface protocols). In some examples, the network entities 105 may communicate with each other via midhaul communication links 162 (e.g., according to a midhaul interface protocol) or fronthaul communication links 168 (e.g., according to a fronthaul interface protocol) or any combination thereof. The backhaul communication links 120, midhaul communication links 162, or 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), etc. or various combinations thereof. UE 115 may communicate with core network 130 via communication link 155 .

[0057] 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 that is physically or logically integrated within a single network entity 105 (e.g., a single RAN node, such as a base station 140).

[0058] 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 initiated 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)).

[0059] The functional split between CU 160, DU 165, and RU 170 is flexible and can 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 can be employed between CU 160 and DU 165, such that CU 160 can support one or more layers of a protocol stack and DU 165 can support one or more different layers of a protocol stack. In some examples, CU 160 can 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 DUs 165 and RUs 170, such that the DUs 165 may support one or more layers of the protocol stack, and the RUs 170 may support one or more different layers of the protocol stack. The DUs 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 the other 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 interfaces (eg, channels) between layers of a protocol stack supported by respective network entities 105 that communicate via those communication links.

[0060] In a wireless communication system (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 a 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., a 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 terminal (IAB-MT) controlled (e.g., scheduled) by a coupled IAB donor's DU 165. 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.

[0061] In the context of the application of the techniques described herein to a disaggregated RAN architecture, one or more components of the disaggregated RAN architecture may be configured to support sidelink feedback for increasing capacity as described herein. For example, some operations described as being performed by UE 115 or network entity 105 (e.g., base station 140) may additionally or alternatively be performed by one or more components of the disaggregated RAN architecture (e.g., IAB node 104, DU 165, CU 160, RU 170, RIC 175, SMO 180).

[0062] 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 "device" may also be referred to as other examples such as a unit, a station, a terminal, or a client. 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, and other examples.

[0063] 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, among other examples. Figure 1 shown.

[0064] The UE 115 and the network entity 105 may use resources associated with one or more carriers to wirelessly communicate with each other via one or more communication links 125 (e.g., access links). The term "carrier" may refer to a set of RF spectrum resources having a physical layer structure defined for supporting 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 part (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 part of the network entity 105 (e.g., base station 140, CU 160, DU 165, RU 170) of the RAN communicating with another device (e.g., directly or via one or more other network entities 105).

[0065] In some examples, such as in a carrier aggregation configuration, a carrier may also have acquisition signaling or control signaling that coordinates the operation of other carriers. A carrier may be associated with a frequency channel (e.g., an Evolved Universal Mobile Telecommunications System Terrestrial Radio Access (E-UTRA) Absolute RF Channel Number (EARFCN)) and may be identified based on a channel raster for discovery by UE 115. A carrier may operate in a standalone mode, in which case initial acquisition and connection may be made by UE 115 via the carrier, or a carrier may operate in a non-standalone mode, in which case the connection is anchored using a different carrier (e.g., a different carrier of the same or different radio access technology).

[0066] The communication link 125 shown in the wireless communication system 100 may include downlink transmissions (e.g., forward link transmissions) from the network entity 105 to the UE 115, uplink transmissions (e.g., return link transmissions) from the UE 115 to the network entity 105, or both, among other transmission configurations. A carrier may carry either downlink communications or uplink communications (e.g., in FDD mode), or may be configured to carry both downlink communications and uplink communications (e.g., in TDD mode).

[0067] A carrier may be associated with a particular bandwidth of the RF spectrum, and in some examples, the carrier bandwidth may be referred to as a "system bandwidth" of the carrier or wireless communication system 100. For example, the carrier bandwidth may be one of a set of bandwidths (e.g., 1.4 megahertz (MHz), 3 MHz, 5 MHz, 10 MHz, 15 MHz, 20 MHz, 40 MHz, or 80 MHz) of a carrier of a particular radio access technology. A device (e.g., a network entity 105, a UE 115, or both) of the wireless communication system 100 may have a hardware configuration that supports communications using a particular carrier bandwidth, or may be capable of being configured to support communications using one of a set of carrier bandwidths. In some examples, the wireless communication system 100 may include a network entity 105 or a UE 115 that supports concurrent communications using carriers associated with multiple carrier bandwidths. In some examples, each served UE 115 may be configured to operate using a portion (e.g., a subband, a BWP) or all of a carrier bandwidth.

[0068] 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, in which case the symbol period and the 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., in 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 of communications with UE 115.

[0069] One or more parameter sets for a carrier may be supported, and the parameter sets may include subcarrier spacing (Δf) and cyclic prefixes. A carrier may be divided into one or more BWPs with the same or different parameter sets. 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 of a UE 115 may be constrained to one or more active BWPs.

[0070] The time interval for the network entity 105 or the UE 115 may be expressed in multiples of a basic time unit, which may be, for example, a sampling period T s =1 / (Δf max ·N f ) seconds, where Δf max 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 having a specified duration (e.g., 10 milliseconds (ms)). Each radio frame may be identified by a system frame number (SFN) (e.g., in the range of 0 to 1023).

[0071] 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 be further divided into a plurality of micro 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 band.

[0072] 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)).

[0073] Physical channels may be multiplexed according to various techniques in order to communicate using a carrier. Physical control channels and physical data channels may be multiplexed, for example, using one or more of a time division multiplexing (TDM) technique, a frequency division multiplexing (FDM) technique, or a hybrid TDM-FDM technique for signaling 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 UE 115 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 multiple UEs 115 , and a UE-specific search space set for transmitting control information to a specific UE 115 .

[0074] In some examples, the network entities 105 (e.g., base stations 140, RUs 170) may be mobile and thus provide communication coverage for mobile geographic 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 respective coverage areas 110 using the same or different radio access technologies.

[0075] 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 one-way 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 UEs 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 subcarrier or resource block (RB) set) within a carrier, within a guard band of a carrier, or outside a carrier.

[0076] 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). The 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.

[0077] 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, the 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.

[0078] 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), or communicate with the network via one or more network nodes (e.g., network entity 105, base station 140, RU 170) using vehicle-to-network (V2N) communication, or both.

[0079] 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 the 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.

[0080] 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 from 300 MHz to 3 GHz is referred to as the ultra-high frequency (UHF) region or decimeter band because the wavelength ranges from about one decimeter to one meter in length. 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.

[0081] 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 use unlicensed bands (such as the 5 GHz Industrial, Scientific, and Medical (ISM) band) to adopt license assisted access (LAA), LTE unlicensed (LTE-U) radio access technology, or NR technology. When operating using unlicensed RF spectrum bands, devices such as network entity 105 and UE 115 may use carrier sensing for conflict detection and avoidance. In some examples, operations performed using unlicensed bands may be based on carrier aggregation configuration in combination with component carriers (e.g., LAA) that operate using licensed bands. Operations performed using unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, and the like.

[0082] 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 technologies such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communication, or beamforming. The antennas of the network entity 105 or UE 115 may be located in one or more antenna arrays or antenna panels, which may 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 antenna ports of multiple rows and columns 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 may support various MIMO or beamforming operations. Additionally or alternatively, the antenna panel may support RF beamforming for signals sent via the antenna ports.

[0083] The network entity 105 or 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 a technology may be referred to as spatial multiplexing. Multiple signals may be, for example, 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 technologies 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.

[0084] 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 communicated via antenna elements of an antenna array so that some signals propagating along a particular orientation relative to the antenna array experience constructive interference, while other signals experience destructive interference. Adjustments to signals communicated 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 orientation (e.g., relative to the antenna array of the transmitting device or the receiving device, or relative to some other orientation).

[0085] The wireless communication system 100 may be a packet-based network that operates according to a layered protocol stack. In the user plane, the communication 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 into 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.

[0086] 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.

[0087] As described herein, UE 115 may support an interlaced PSFCH design for sending sidelink feedback information. An interlaced PSFCH design may include configuration of one or more interlaced PSFCHs. In some examples, UE 115 may send feedback indications (e.g., ACK or NACK) via one or more (e.g., configured, dynamic, or configurable) IRBs of an interlace. For example, UE 115 may occupy the first interlace of PSFCH, and may send feedback indications via two or more IRBs of the interlace. In addition, the IRBs used by UE 115 may be configurable (e.g., via RRC signaling). That is, network entity 105 may configure UE 115 using the number of IRBs, the distribution of IRBs, the pattern of IRBs, or any combination thereof, for sending feedback indications via interlacing. Additionally or alternatively, UE 115 may determine to send feedback via multiple IRBs of an interlace different from a common interlace. That is, UE 115 may send feedback via an IRB of a first interlace offset from an IRB of a common interlace, which may increase the transmit power for feedback information. In some cases, UE 115 may reduce the transmit power for common IRBs, IRBs carrying feedback, or both to avoid exceeding power spectral density (PSD) limits. In some examples, such as when PSFCH supports capacity enhancement PSFCH format 0 (PF0), UE 115 may determine the multiplexing configuration for PSFCH.

[0088] Figure 2 An example of a wireless communication system 200 that supports sidelink feedback for increasing capacity according to one or more aspects of the present disclosure is illustrated. The wireless communication system 200 may include one or more aspects of the wireless communication system 100. For example, the wireless communication system 200 may include a UE 115-a and a UE 115-b, each of which may be as described in reference Figure 1 An example of UE 115. In some cases, the wireless communication system 200 may illustrate an interleaved PSFCH configuration for sending feedback information (such as HARQ-ACK or HARQ-NACK) from UE 115-a to UE 115-b.

[0089] In some examples, UE 115-a and UE 115-b may communicate according to a sidelink configuration (e.g., perform communication independently of network entity 105). That is, UE 115-b may send a sidelink data transmission 215 via a sidelink data channel 205 (e.g., a PSSCH or a PSCCH), and UE 115-a may send a sidelink feedback transmission 220 via a sidelink feedback channel 210 (e.g., a PSFCH). In some cases, the sidelink data channel 205 and the sidelink feedback channel 210 may be examples of the same bandwidth at different symbols of a sidelink timeslot. In some cases, the sidelink feedback transmission 220 may be performed according to an interleaving configuration of the sidelink feedback channel 210. The interleaving configuration may indicate one or more interlaces associated with the sidelink feedback channel 210. For example, UE 115-a may send a feedback indication via an interlace including one or more IRBs 225, which may be evenly distributed across the channel bandwidth. That is, the first IRB and the second IRB of the IRB 225 may be offset by one or more RBs of the PSFCH (e.g., not contiguous in frequency). Such interleaving may support extending the PSFCH waveform to meet OCB constraints (e.g., 60%, 75%, 80% OCB), but may limit the capacity of the PSFCH (e.g., the number of UEs 115 sending feedback via the PSFCH).

[0090] Thus, UE 115-a may occupy a common interleaved IRB (e.g., used by multiple sidelink UEs 115) and may send feedback via one or more dedicated RBs (e.g., statically configured). For example, UE 115-a may send feedback indications via dedicated RBs for PSFCH (e.g., common interleaved IRBs or different RBs) and may send dummy signals (e.g., irrelevant information, known information or sequences, predefined signals) via common interleaved IRBs to satisfy OCB constraints. In some cases, one or more other sidelink UEs 115 may use similar techniques to send corresponding feedback indications. However, sending feedback via dedicated RBs may result in an irregular PSFCH waveform, may limit coverage (e.g., transmit power), and may result in proximity sensitivity at UE 115-a (e.g., due to other nearby sidelink UEs 115 sending dummy signals via dedicated RBs).

[0091] In order to support enhanced feedback communication in an interleaved PSFCH configuration, the UE 115-a may be dynamically configured to send one or more feedback indications via one or more IRBs of the PSFCH. That is, the UE 115-a may receive a message (e.g., a control message such as a downlink control information (DCI) message, a MAC-CE, an RRC message, etc.) indicating the configuration of one or more IRBs for repeated transmission of feedback indications. In some cases, the configuration may include the number of interleaved IRBs (e.g., a single interleaved IRB, each interleaved IRB, or any number therebetween), the distribution of the IRBs, the pattern of the IRBs, or any combination thereof. In addition, the RBs of the PSFCH may include a cyclic shift pair set 230, which may include one or more feedback cyclic shift pairs 235, one or more reserved cyclic shift pairs 240, or both. In some cases, the UE 115-a may send feedback indications via a feedback cyclic shift pair 235 associated with the IRB indicated by the configuration, and may send a dummy signal via a reserved cyclic shift pair 240 associated with the remaining IRBs of the interleaving.

[0092] In some examples, the allowable transmit power of UE 115-a can be associated with the number of feedback indications sent by UE 115-a in an interlace. For example, a first number of feedback indications (e.g., one feedback indication) can correspond to a first allowed transmit power for UE 115-a (e.g., 10 dBm), and a second number of feedback indications (e.g., two feedback indications) can correspond to a second allowed transmit power for UE 115-a (e.g., 13 dBm). In other words, sending a larger number of feedback indications within an interlace can support a higher transmit power that does not exceed the PSD limit of the PSFCH. In addition, sending a larger number of feedback indications within an interlace can increase the robustness of the sidelink feedback transmission 220 (i.e., reduce the likelihood that the feedback indication is interfered with by a dummy signal sent by a nearby UE on the same IRB).

[0093] UE 115-a may use a distribution associated with an interlace, a pattern associated with the RBs of the PSFCH, or both to determine which IRBs of which interlace to send feedback indications. For example, the configuration may indicate that the number of IRBs used for feedback indications will be evenly distributed across interlaces, which may support greater frequency diversity. Alternatively, the configuration may indicate that the number of IRBs used for feedback indications will be continuous within an interlace, which may support various configurations of IRBs (e.g., different configurable numbers of IRBs that may be used or configured for feedback). In some cases, the RBs of the PSFCH may be configured by one or more parameters associated with the distribution of the interlaced IRBs. That is, UE 115-a may identify an RB indicating an interlace index, a starting IRB, and the number of IRBs (e.g., for a continuous IRB mode), and may also include an IRB gap (e.g., for a distributed IRB mode). In some cases, the RBs configured by one or more parameters may be continuous in frequency (e.g., including a continuous bandwidth of the RB), or may be configured per RB.

[0094] In some examples, the interleaving of the PSFCH may be configured according to a cyclic shift ramp to reduce a peak-to-average power ratio (PAPR) of the sidelink feedback transmission 220. For example, an interleaved IRB 225 may each include a reserved cyclic shift pair 240 at a cyclic shift pair index that is offset from a subsequent IRB 225 (e.g., an offset of one cyclic shift pair index). In some examples, the cyclic shift ramp may be common such that each interleaving of the PSFCH applies a cyclic shift ramp. In such an example, the network entity 105 may share a common cyclic shift ramp with one or more sidelink UEs 115, which may prevent or reduce conflicts between feedback cyclic shift pairs 235 of an IRB and reserved cyclic shift pairs 240 of an IRB associated with a different communication link.

[0095] Additionally or alternatively, UE 115-a may be configured to send feedback information via partial interleaving (e.g., rather than full interleaving occupying a 20 MHz subband). The partial interleaving may include a subset of interleaved IRBs, where the subset of IRBs may be determined based on IRB indices of IRBs in the subset of IRBs. For example, the interleaving may include ten IRBs (e.g., IRB0 to IRB9), and UE 115-a may identify partial interleavings corresponding to even-indexed IRBs (e.g., IRB0, IRB2, IRB4, IRB6, and IRB8), may identify partial interleavings corresponding to odd-indexed IRBs (e.g., IRB1, IRB3, IRB5, IRB7, and IRB9), or both. In some examples, UE 115-a may then send one or more feedback indications and dummy signals via one or more partial interfaces (e.g., based on the configured IRBs). In one such example, UE 115-a may send feedback indications via one or more IRBs of the partial interleaving (e.g., IRB0 and IRB2) and may send dummy signals via the remaining IRBs of the partial interleaving (e.g., IRB4, IRB6, and IRB8). In another example, UE 115-a may send feedback indications via one or more IRBs of the first partial interleaving (e.g., IRB0 and IRB2) and may send dummy signals via the IRBs of the second partial interleaving (e.g., IRB1, IRB3, IRB5, and IRB7). In addition, partial interleaving may be configured to support cyclic shift ramps as described herein. In some cases, transmitting via partial interleaving may support increased PSFCH capacity (e.g., allowing a larger number of UEs 115 to transmit).

[0096] Figure 3 An example of an interleaving configuration 300 that supports sidelink feedback for increasing capacity according to one or more aspects of the present disclosure is illustrated. The interleaving configuration 300 can implement one or more aspects of the wireless communication system 200. For example, the interleaving configuration 300 can be an example of an interleaved IRB included in the PSFCH bandwidth, as described in reference to Figure 2 In some examples, interlace configuration 300 may illustrate common interlace 305 (e.g., interlace #0 including IRB 320-a and IRB 320-b) and configured interlace 310 (e.g., interlace #1 including IRB 325-a and IRB 325-b), which may be used by UE 115 to send feedback indications in response to sidelink transmissions, to send dummy signals to satisfy OCB constraints, or both.

[0097] In some examples, one or more sidelink UEs 115 may transmit via common interlace 305 and one or more IRBs of different interlaces. In such examples, UE 115 may transmit a dummy signal via an IRB of common interlace 305 and may transmit a configurable number of feedback indications via an IRB of configuration interlace 310. In some cases, UE 115 may be configured (e.g., indicated via a control signal such as RRC) with the number of feedback indications and the distribution pattern of the feedback indications within the configuration interlace, as described in reference to FIG. Figure 2 In addition, to support reducing the PAPR for sidelink transmissions, the UE 115 may identify a cyclic shift ramp configuration for common interlace 305, configuration interlace 310, or both, as described in reference to Figure 2 described.

[0098] In some cases, UE 115 can configure transmit power for dummy signals and feedback indications that are sent relatively close in frequency. For example, UE 115 can send dummy signals via reserved cyclic pairs 325 of IRB 320-a and reserved cyclic pairs 325 of IRB 320-b (which can be included in public interlace 305). UE 115 can also send one or more feedback indications (e.g., according to interlace configuration) via feedback cyclic shift pairs 330 of IRB 325-a and feedback cyclic shift pairs 330 of IRB 325-b (which can be included in configuration interlace 310). In some cases, public interlace 305 and configuration interlace 310 can have similar distributions across PSFCH bandwidth, with RB offsets between IRBs of each interlace. In addition, due to sending dummy signals and feedback indications via IRBs that are relatively close in frequency (e.g., one RB offset), UE 115 may exceed PSD limits (e.g., 10 dBm / MHz). In such a case, the UE 115 may adjust the transmit power for the feedback indication, the dummy signal, or both after identifying that the first IRB for the feedback indication and the second IRB for the dummy signal are within a threshold number of RBs (e.g., N RBs) of each other. For example, the UE 115 may modify the transmit power for the dummy signal (e.g., reduce the power or drop the transmission), may modify the transmit power for the feedback indication (e.g., reduce the power), or both.

[0099] In some examples, UE 115 may be configured to send feedback signals, dummy signals, or both via each of public interlace 305 and configuration interlace 310. That is, UE 115 may send dummy signals via one or more IRBs of public interlace 305 (e.g., using corresponding reserved cyclic shift pairs 325), and may send a configurable number of feedback indications via one or more IRBs of public interlace 305, configuration interlace 310, or both (e.g., selecting feedback cyclic shift pairs 330). In some cases, such as when UE 115 sends feedback indications via public interlace 305, UE 115 may send feedback indications in the number of feedback indications via cyclic shift pairs of IRBs different from reserved cyclic shift pairs 325 (e.g., to avoid conflicts with other UEs 115 that send dummy signals to meet OCB constraints). Alternatively, such as when UE 115 sends feedback via configuration interlace 310, UE 115 may send feedback indications in the number of feedback indications via available cyclic shift pairs of IRBs. In other words, UE 115 may select a cyclic shift pair for sending feedback via configuration interlace 310 based on cyclic shift pairs used by other UEs 115 instead of reserved cyclic shift pairs 325. In addition, the number, pattern (e.g., continuous or distributed within an interlace), or both of the IRBs used for feedback indication and the cyclic shift ramp associated with common interlace 305, configuration interlace 310, or both (e.g., to mitigate PAPR) may be used as described in reference to FIG. Figure 2 The technology described above is used for configuration.

[0100] Figure 4 An example of an interleaved resource block configuration 400 for supporting sidelink feedback for increased capacity according to one or more aspects of the present disclosure is illustrated. The interleaved RB configuration 400 may be implemented by one or more aspects of the wireless communication system 200. For example, the interleaved RB configuration 400 may be an example of one or more interleavings including a PSFCH bandwidth, as described in reference to Figure 2 The interleaved RB configuration 400 may illustrate an RB set 405, which may be an example of a PSFCH bandwidth including a certain number of RBs (e.g., 50 RBs). In addition, each RB in the RB set 405 may be associated with a conventional PF0 410 or an enhanced PF0 415 (e.g., a capacity enhancement waveform), which may correspond to a different configuration resource pool of the PSFCH bandwidth.

[0101] In some examples, UE 115 may send feedback via a regular PF0 410 waveform or an enhanced PF0 415 waveform. In such examples, UE 115 may identify a configuration (e.g., a hard partitioning of resource pools) of a first resource pool of RBs associated with regular PF0 410 and a second resource pool of RBs associated with enhanced PF0 415. Additionally or alternatively, UE 115 may identify a multiplexing configuration of regular PF0 410 and enhanced PF0 415 in RB set 405.

[0102] In a first example, the conventional PF0 410 and the enhanced PF0 415 may be multiplexed according to a frequency division multiplexing (FDM) scheme. The UE 115 may assign the conventional PF0 410 and the enhanced PF0 415 to different interlaces of the RB set 405. For example, if the RB set 405 includes five interlaces, the first number of interlaces (e.g., interlace #0 and interlace #1) may include IRBs associated with the conventional PF0 410, and the remaining number of interlaces (e.g., interlace #1, interlace #2, and interlace #3) may include IRBs associated with the enhanced PF0 415. By applying such a multiplexing configuration, an IRB carrying a feedback indication (e.g., an enhanced PF0 415 IRB) may avoid collision with an IRB associated with a different waveform (e.g., a conventional PF0 410 IRB).

[0103] In a second example, the normal PFO 410 and the enhanced PFO 415 may be multiplexed according to a time division multiplexing (TDM) scheme. In such an example, the UE 115 may temporally assign the normal PFO 410 and the enhanced PFO 415 to different instances of the RB set 405. For example, the UE 115 may transmit a waveform according to the normal PFO 410 for each RB in the RB set 405 at a first PSFCH symbol (e.g., a first time), and may transmit a waveform according to the enhanced PFO 415 for each RB in the RB set 405 at a second PSFCH symbol (e.g., a second time).

[0104] In a third example, the conventional PF0 410 and the enhanced PF0 415 may be multiplexed according to a cyclic division multiplexing (CDM) scheme. In such an example, the UE 115 may assign the conventional PF0 410 and the enhanced PF0 415 to different cyclic shift pair indices of RBs in the RB set 405. That is, the UE 115 may specify a first number of cyclic shift pairs of RBs for the conventional PF0 410, and may specify a second number of cyclic shift pairs of RBs for the enhanced PF0 415.

[0105] In some cases, a transmitting UE 115 (e.g., transmitting side link data) may indicate a resource pool of the PSFCH for one or more receiving UEs 115 to send side link feedback (e.g., in response to the side link data). For example, the transmitting UE 115 may send a control message (e.g., a side link control information (SCI) message, an explicit indication in SCI-2) indicating a resource pool for the receiving UE 115. Alternatively, the resource pool may be configured per link, or may depend on the transmission type of the link. For example, the receiving UE 115 may determine to use a resource pool associated with the enhanced PF0 415 based on a multicast message identified (e.g., supported by the enhanced PF0 415). In another example, the resource pool may be configured via higher layer signaling (e.g., PC-5RRC) per link associated with the PSFCH.

[0106] Figure 5 An example of a process flow 500 for supporting sidelink feedback for increasing capacity in accordance with one or more aspects of the present disclosure is illustrated. The process flow 500 may implement aspects of the wireless communication system 100 and the wireless communication system 200. For example, the process flow 500 may be implemented by UE 115-c and UE 115-d, which may be as described in reference to FIG. Figure 2 The process flow 500 may illustrate that the UE 115-c sends a feedback indication and a dummy signal via an IRB of the PSFCH bandwidth.

[0107] At 505, UE 115-d may send a sidelink message to UE 115-c. The sidelink message may be sent via a sidelink channel such as a PSCCH or a PSSCH. In some examples, the sidelink message may indicate that UE 115-c is to send feedback to indicate whether the sidelink message was successfully received.

[0108] At 510, UE 115-d may send a resource pool configuration to UE 115-c. In some cases, the resource pool configuration may indicate one or more resource pools associated with one or more waveforms of the PSFCH, such as a conventional PFO waveform and a capacity enhancement PFO waveform. Additionally or alternatively, the configuration may indicate a multiplexing scheme associated with the one or more resource pools, such as TDM, FDM, CDM, or any combination thereof.

[0109] At 515, the UE 115-c may generate one or more feedback indications. For example, the UE 115-c may be configured with a number of feedback indications to send, a pattern of IRBs within an interlace via which the one or more feedback indications are to be sent, or both. In some cases, the UE 115-c may receive the configuration via RRC signaling or via control signaling (e.g., SCI).

[0110] At 520, the UE 115-c may send an interleaved feedback indication. For example, the UE 115-c may send a configurable number of feedback indications via one or more configurable IRBs of the interleaving. In some cases, the UE 115-c may send a configurable number of feedback indications via a configured interleaving, a common interleaving, or both associated with the PSFCH. In addition, the UE 115-c may send a configurable number of feedback indications via a cyclic shift pair of a corresponding IRB. In some examples, the IRB may include a reserved cyclic shift pair for sending a dummy signal (e.g., to satisfy an OCB constraint), and the cyclic shift pair index of the first reserved cyclic shift pair of the IRB may be offset (e.g., a cyclic shift ramp) from the cyclic shift pair index of the second reserved cyclic shift pair of a subsequent IRB of the interleaving. Additionally or alternatively, the UE 115-c may send feedback indications via a subset of IRBs of the interleaving (e.g., a partial interleaving), and may send dummy signals via the remaining IRBs of the subset of the IRBs, or the remaining IRBs of the interleaving.

[0111] At 525, UE 115-c may send an interleaved dummy signal to UE 115-d. For example, UE 115-c may be configured to send one or more dummy signals via public interleaved IRBs to support OCB constraints. In addition, UE 115-c may send dummy signals via reserved cyclic shift pairs of each IRB of public interleaving. In some examples, UE 115-c may refrain from sending dummy signals via IRBs configured for feedback indications from UE 115-c. In addition, when the IRBs for dummy signals (e.g., public interleaved IRBs) and the IRBs for feedback indications (e.g., configured interleaved IRBs) are within a threshold number of RBs of each other, UE 115-c may reduce the transmit power of the feedback indication, may reduce the transmit power or discard the transmission of the dummy signal, or both, to avoid exceeding the PSD limit.

[0112] Figure 6A block diagram 600 of a device 605 supporting sidelink feedback for increasing capacity according to one or more aspects of the present disclosure is shown. The device 605 may be an example of aspects of a UE 115 as described herein. The device 605 may include a receiver 610, a transmitter 615, and a communication manager 620. The device 605 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0113] Receiver 610 may provide means for receiving information such as packets associated with various information channels (e.g., control channels related to sidelink feedback for increased capacity, data channels, information channels), user data, control information, or any combination thereof. The information may be communicated to other components of device 605. Receiver 610 may utilize a single antenna or a collection of multiple antennas.

[0114] The transmitter 615 may provide means for transmitting signals generated by other components of the device 605. For example, the transmitter 615 may transmit information such as packets associated with various information channels (e.g., control channels related to sidelink feedback for increased capacity, data channels, information channels), user data, control information, or any combination thereof. In some examples, the transmitter 615 may be co-located with the receiver 610 in a transceiver module. The transmitter 615 may utilize a single antenna or a collection of multiple antennas.

[0115] The communication manager 620, the receiver 610, the transmitter 615, or various combinations thereof or various components thereof may be examples of means for performing various aspects of sidelink feedback for increasing capacity as described herein. For example, the communication manager 620, the receiver 610, the transmitter 615, or various combinations thereof or components thereof may support methods for performing one or more of the functions described herein.

[0116] In some examples, the communication manager 620, the receiver 610, the transmitter 615, 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).

[0117] Additionally or alternatively, in some examples, the communication manager 620, the receiver 610, the transmitter 615, 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 620, the receiver 610, the transmitter 615, 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.

[0118] In some examples, communication manager 620 may be configured to perform various operations (e.g., receive, obtain, monitor, output, transmit) using or otherwise cooperating with receiver 610, transmitter 615, or both. For example, communication manager 620 may receive information from receiver 610, transmit information to transmitter 615, or be integrated in conjunction with receiver 610, transmitter 615, or both to obtain information, output information, or perform various other operations as described herein.

[0119] According to examples as disclosed herein, the communication manager 620 may support wireless communication at the first UE. For example, the communication manager 620 may be configured to or otherwise support a component for receiving a sidelink message from a second UE via a resource set of a sidelink channel. The communication manager 620 may be configured to or otherwise support a component for generating a set of multiple feedback indications based at least on the sidelink message. The communication manager 620 may be configured to or otherwise support a component for sending a set of multiple feedback indications to a second UE via a sidelink feedback channel and via one or more configurable resources according to interleaving, the interleaved indication comprising a set of multiple frequency resources of the one or more configurable resources, wherein the set of multiple frequency resources is evenly distributed across the bandwidth of the sidelink feedback channel.

[0120] Additionally or alternatively, according to examples as disclosed herein, the communication manager 620 may support wireless communication at the first UE. The communication manager 620 may be configured to or otherwise support components for sending a sidelink message to at least a second UE via a set of resources of a sidelink channel. The communication manager 620 may be configured to or otherwise support components for receiving a set of multiple feedback indications associated with the sidelink message from the second UE via one or more configurable resources via a sidelink feedback channel according to an interleaving, the interleaving indication comprising a set of multiple frequency resources of the one or more configurable resources, wherein the set of multiple frequency resources is evenly distributed across the bandwidth of the sidelink feedback channel.

[0121] By including or configuring a communication manager 620 according to the examples described herein, the device 605 (e.g., a processor controlling the receiver 610, the transmitter 615, the communication manager 620, or a combination thereof or otherwise coupled thereto) may support techniques for enhancing sidelink feedback indications, which may improve the reliability of sidelink communications and, thereby, improve device power consumption and user experience.

[0122] Figure 7 A block diagram 700 of a device 705 supporting sidelink feedback for increasing capacity according to one or more aspects of the present disclosure is shown. The device 705 may be an example of aspects of the device 605 or UE 115 as described herein. The device 705 may include a receiver 710, a transmitter 715, and a communication manager 720. The device 705 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0123] The receiver 710 may provide means for receiving information such as packets associated with various information channels (e.g., control channels related to sidelink feedback for increased capacity, data channels, information channels), user data, control information, or any combination thereof. The information may be communicated to other components of the device 705. The receiver 710 may utilize a single antenna or a collection of multiple antennas.

[0124] The transmitter 715 may provide means for transmitting signals generated by other components of the device 705. For example, the transmitter 715 may transmit information such as packets associated with various information channels (e.g., control channels related to sidelink feedback for increased capacity, data channels, information channels), user data, control information, or any combination thereof. In some examples, the transmitter 715 may be co-located with the receiver 710 in a transceiver module. The transmitter 715 may utilize a single antenna or a collection of multiple antennas.

[0125] Device 705 or their various components may be examples of components for performing various aspects of sidelink feedback for increasing capacity as described herein. For example, communication manager 720 may include sidelink message receiver 725, feedback generator 730, feedback indication transmitter 735, sidelink message transmitter 740, feedback indication receiver 745, or any combination thereof. Communication manager 720 may be an example of various aspects of communication manager 620 as described herein. In some examples, communication manager 720 or their various components may be configured to perform various operations (e.g., receive, obtain, monitor, output, send) using or otherwise cooperating with receiver 710, transmitter 715, or both. For example, communication manager 720 may receive information from receiver 710, transmit information to transmitter 715, or integrate with receiver 710, transmitter 715, or both in combination to obtain information, output information, or perform various other operations as described herein.

[0126] According to the examples disclosed herein, the communication manager 720 may support wireless communication at the first UE. The sidelink message receiver 725 may be configured to or otherwise support a component for receiving a sidelink message from a second UE via a resource set of a sidelink channel. The feedback generator 730 may be configured to or otherwise support a component for generating a set of multiple feedback indications based at least on the sidelink message. The feedback indication transmitter 735 may be configured to or otherwise support a component for sending a set of multiple feedback indications to a second UE via a sidelink feedback channel and via one or more configurable resources according to an interleaving, the interleaved indication comprising a set of multiple frequency resources of the one or more configurable resources, wherein the set of multiple frequency resources is evenly distributed across the bandwidth of the sidelink feedback channel.

[0127] Additionally or alternatively, according to examples as disclosed herein, the communication manager 720 may support wireless communication at the first UE. The sidelink message transmitter 740 may be configured to or otherwise support components for transmitting a sidelink message to at least a second UE via a set of resources of a sidelink channel. The feedback indication receiver 745 may be configured to or otherwise support components for receiving a set of multiple feedback indications associated with the sidelink message from the second UE via one or more configurable resources via a sidelink feedback channel according to an interleaving, the interleaving indication comprising a set of multiple frequency resources of the one or more configurable resources, wherein the set of multiple frequency resources is evenly distributed across the bandwidth of the sidelink feedback channel.

[0128] Figure 8A block diagram 800 of a communication manager 820 supporting sidelink feedback for increasing capacity according to one or more aspects of the present disclosure is shown. The communication manager 820 may be an example of aspects of the communication manager 620, the communication manager 720, or both as described herein. The communication manager 820 or its various components may be examples of components for performing various aspects of sidelink feedback for increasing capacity as described herein. For example, the communication manager 820 may include a sidelink message receiver 825, a feedback generator 830, a feedback indication transmitter 835, a sidelink message transmitter 840, a feedback indication receiver 845, a mode receiver 850, a resource indication receiver 855, a mode transmitter 860, a resource indication transmitter 865, a dummy signal transmitter 870, a dummy signal receiver 875, or any combination thereof. Each of these components may communicate with each other directly or indirectly (e.g., via one or more buses).

[0129] According to the examples disclosed herein, the communication manager 820 may support wireless communication at the first UE. The sidelink message receiver 825 may be configured to or otherwise support a component for receiving a sidelink message from a second UE via a resource set of a sidelink channel. The feedback generator 830 may be configured to or otherwise support a component for generating a set of multiple feedback indications based at least on the sidelink message. The feedback indication transmitter 835 may be configured to or otherwise support a component for sending a set of multiple feedback indications to a second UE via a sidelink feedback channel and via one or more configurable resources according to interleaving, the interleaved indication comprising a set of multiple frequency resources of the one or more configurable resources, wherein the set of multiple frequency resources is evenly distributed across the bandwidth of the sidelink feedback channel.

[0130] In some examples, the feedback indication transmitter 835 may be configured to or otherwise support a component for sending a first number of feedback indications at a first time and a first transmit power via one or more configurable resources. In some examples, the feedback indication transmitter 835 may be configured to or otherwise support a component for sending a second number of feedback indications at a second time and a second transmit power via one or more configurable resources, wherein the first number is the same as the second number, and the first transmit power is lower than the second transmit power.

[0131] In some examples, to support sending a set of multiple feedback indications, the feedback indication transmitter 835 may be configured as or otherwise support components for sending each feedback indication of the set of multiple feedback indications via a first cyclic shift pair in a first set of multiple cyclic shift pairs associated with corresponding frequency resources in one or more configurable resources.

[0132] In some examples, to support sending a set of multiple feedback indications via one or more configurable resources, the dummy signal transmitter 870 may be configured as or otherwise support components for sending one or more dummy signals via a remaining number of frequency resources in a set of multiple frequency resources, wherein each of the one or more dummy signals is sent via a second cyclic shift pair in a second set of multiple cyclic shift pairs associated with a corresponding frequency resource in the remaining number of frequency resources, wherein the second cyclic shift pair is a first reserved cyclic shift pair for sending the dummy signal.

[0133] In some examples, a first cyclic shift pair index of a first reserved cyclic shift pair for a corresponding frequency resource is offset from a second cyclic shift pair index of a second reserved cyclic shift pair for a subsequent frequency resource in the set of multiple frequency resources.

[0134] In some examples, pattern receiver 850 may be configured or otherwise support components for receiving a message including an indication of a number of feedback indications to be sent, a pattern associated with a set of multiple frequency resources, or both, wherein sending the set of multiple feedback indications is based on receiving the message.

[0135] In some examples, the side link channel includes a set of multiple interlaces, and the feedback indication transmitter 835 may be configured as or otherwise support components for transmitting the set of multiple feedback indications via a first interlace of the multiple interlaces that is different from a second interlace in the set of multiple interlaces, where the second interlace is a common interlace.

[0136] In some examples, the feedback indication transmitter 835 may be configured to or otherwise support components for sending feedback indications, dummy signals, or both at a transmission power less than a threshold power based on the number of frequency resources between a first frequency resource in one or more configurable resources for a feedback indication in a set of multiple feedback indications and a second frequency resource for a dummy signal associated with a second interlace exceeding a threshold number of frequency resources.

[0137] In some examples, the interleaving includes a set of multiple interleavings, and the feedback indication transmitter 835 may be configured as or otherwise support components for transmitting the set of multiple feedback indications via a first interleaving of the multiple interleavings, a second interleaving of the multiple interleavings, or both, where the second interleaving is a common interleaving.

[0138] In some examples, the feedback indication transmitter 835 may be configured to or otherwise support components for sending a set of multiple feedback indications via a first subset of a set of multiple frequency resources, wherein the first subset includes one or more configurable resources. In some examples, the feedback indication transmitter 835 may be configured to or otherwise support components for sending one or more dummy signals via the remaining frequency resources in the first subset, via one or more frequency resources in the second subset of the set of multiple frequency resources, or both.

[0139] In some examples, resource indication receiver 855 may be configured or otherwise support components for receiving an indication of a set of multiple feedback indications sent via a first resource pool or a second resource pool, where the first resource pool is a default resource pool and the second resource pool is a capacity enhancement resource pool.

[0140] In some examples, the first resource pool and the second resource pool are multiplexed across the bandwidth of the side link channel according to a frequency division multiplexing scheme, a time division multiplexing scheme, a code division multiplexing scheme, or any combination thereof.

[0141] In some examples, the indication is received via a control message or a radio resource control message.

[0142] Additionally or alternatively, according to examples as disclosed herein, the communication manager 820 may support wireless communication at the first UE. The sidelink message transmitter 840 may be configured to or otherwise support components for transmitting a sidelink message to at least a second UE via a set of resources of a sidelink channel. The feedback indication receiver 845 may be configured to or otherwise support components for receiving a set of multiple feedback indications associated with the sidelink message from the second UE via one or more configurable resources via a sidelink feedback channel according to an interleaving, the interleaving indication comprising a set of multiple frequency resources of the one or more configurable resources, wherein the set of multiple frequency resources is evenly distributed across the bandwidth of the sidelink feedback channel.

[0143] In some examples, feedback indication receiver 845 may be configured to or otherwise support components for receiving a first number of feedback indications at a first time and at a first power via one or more configurable resources. In some examples, feedback indication receiver 845 may be configured to or otherwise support components for receiving a second number of feedback indications at a second time and at a second power via one or more configurable resources, wherein the first number is less than the second number, and the first power is lower than the second power.

[0144] In some examples, to support receiving a set of multiple feedback indications, the feedback indication receiver 845 may be configured as or otherwise support components for receiving each feedback indication of the set of multiple feedback indications via a first cyclic shift pair in a first set of multiple cyclic shift pairs associated with corresponding frequency resources in one or more configurable resources.

[0145] In some examples, to support receiving a set of multiple feedback indications via one or more configurable resources, the dummy signal receiver 875 may be configured as or otherwise support components for receiving one or more dummy signals via a remaining number of frequency resources in a set of multiple frequency resources, wherein each of the one or more dummy signals is received via a second cyclic shift pair in a second set of multiple cyclic shift pairs associated with a corresponding frequency resource in the remaining number of frequency resources, wherein the second cyclic shift pair is a first reserved cyclic shift pair for conveying the dummy signal.

[0146] In some examples, a first cyclic shift pair index of a first reserved cyclic shift pair for a corresponding frequency resource is offset from a second cyclic shift pair index of a second reserved cyclic shift pair for a subsequent frequency resource in the set of multiple frequency resources.

[0147] In some examples, the pattern transmitter 860 may be configured to or otherwise support components for sending a message including an indication of a number of feedback indications to be sent to a second UE, a pattern associated with a set of multiple frequency resources, or both, wherein receiving the set of multiple feedback indications is based on sending the message.

[0148] In some examples, the side link channel includes a set of multiple interlaces, and the feedback indication receiver 845 may be configured as or otherwise support components for receiving a set of multiple feedback indications via a first interlace of the multiple interlaces that is different from a second interlace of the set of multiple interlaces, where the second interlace is a common interlace.

[0149] In some examples, the feedback indication receiver 845 may be configured to or otherwise support components for receiving feedback indications, dummy signals, or both at a power less than a threshold power based on the number of frequency resources between a first frequency resource in one or more configurable resources for a feedback indication in a set of multiple feedback indications and a second frequency resource for a dummy signal associated with a second interlace exceeding a threshold number of frequency resources.

[0150] In some examples, the interlace includes a set of multiple interlaces, and the feedback indication receiver 845 may be configured as or otherwise support components for receiving the set of multiple feedback indications via a first interlace of the multiple interlaces, a second interlace of the multiple interlaces, or both, where the second interlace is a common interlace.

[0151] In some examples, the feedback indication receiver 845 may be configured to or otherwise support components for receiving a set of multiple feedback indications via a first subset of a set of multiple frequency resources, wherein the first subset includes one or more configurable resources. In some examples, the feedback indication receiver 845 may be configured to or otherwise support components for receiving one or more dummy signals via the remaining frequency resources in the first subset, via one or more frequency resources in the second subset of the set of multiple frequency resources, or both.

[0152] In some examples, the resource indication transmitter 865 may be configured as or otherwise support components for sending an indication of a set of multiple feedback indications to a second UE via a first resource pool or a second resource pool, where the first resource pool is a default resource pool and the second resource pool is a capacity enhancement resource pool.

[0153] In some examples, the first resource pool and the second resource pool are multiplexed across the bandwidth of the side link channel according to a frequency division multiplexing scheme, a time division multiplexing scheme, a code division multiplexing scheme, or any combination thereof.

[0154] In some examples, the indication is sent via a control message or a radio resource control message.

[0155] Fig. 9 A diagram of a system 900 including a device 905 supporting sidelink feedback for increasing capacity according to one or more aspects of the present disclosure is shown. The device 905 may be an example of a device 605, a device 705, or a UE 115 as described herein, or include components thereof. The device 905 may communicate (e.g., wirelessly) with one or more network entities 105, one or more UEs 115, or any combination thereof. The device 905 may include components for two-way voice and data communications, including components for sending and receiving communications, such as a communication manager 920, an input / output (I / O) controller 910, a transceiver 915, an antenna 925, a memory 930, a code 935, and a processor 940. These components may be electronically communicated or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more buses (e.g., a bus 945).

[0156] I / O controller 910 can manage input and output signals of device 905. I / O controller 910 can also manage peripheral devices that are not integrated into device 905. In some cases, I / O controller 910 can represent a physical connection or port to an external peripheral device. In some cases, I / O controller 910 can utilize an operating system such as or another known operating system. Additionally or alternatively, I / O controller 910 may represent or interact with a modem, keyboard, mouse, touch screen, or similar device. In some cases, I / O controller 910 may be implemented as part of a processor (such as processor 940). In some cases, a user may interact with device 905 via I / O controller 910 or via hardware components controlled by I / O controller 910.

[0157] In some cases, the device 905 may include a single antenna 925. However, in some other cases, the device 905 may have more than one antenna 925, which can send or receive multiple wireless transmissions concurrently. The transceiver 915 can communicate bidirectionally via one or more antennas 925, wired or wireless links, as described herein. For example, the transceiver 915 may represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. The transceiver 915 may also include a modem for: modulating packets; providing the modulated packets to one or more antennas 925 for transmission; and demodulating packets received from one or more antennas 925. The transceiver 915 or the transceiver 915 and one or more antennas 925 can be examples of transmitters 615, transmitters 715, receivers 610, receivers 710, or any combination thereof or components thereof as described herein.

[0158] The memory 930 may include random access memory (RAM) and read-only memory (ROM). The memory 930 may store computer-readable, computer-executable code 935 including instructions that, when executed by the processor 940, cause the device 905 to perform various functions described herein. The code 935 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 935 may not be directly executable by the processor 940, but may (e.g., when compiled and executed) cause the computer to perform the functions described herein. In some cases, the memory 930 may also include, 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.

[0159] The processor 940 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, the processor 940 may be configured to operate a memory array using a memory controller. In some other cases, the memory controller may be integrated into the processor 940. The processor 940 may be configured to execute computer-readable instructions stored in a memory (e.g., a memory 930) so that the device 905 performs various functions (e.g., functions or tasks that support sidelink feedback for increasing capacity). For example, the device 905 or a component of the device 905 may include a processor 940 and a memory 930 coupled to or coupled to the processor 940, and the processor 940 and the memory 930 are configured to perform the various functions described herein.

[0160] According to examples as disclosed herein, the communication manager 920 may support wireless communication at the first UE. For example, the communication manager 920 may be configured to or otherwise support a component for receiving a sidelink message from a second UE via a resource set of a sidelink channel. The communication manager 920 may be configured to or otherwise support a component for generating a set of multiple feedback indications based at least on the sidelink message. The communication manager 920 may be configured to or otherwise support a component for sending a set of multiple feedback indications to a second UE via a sidelink feedback channel and via one or more configurable resources according to interleaving, the interleaved indication comprising a set of multiple frequency resources of the one or more configurable resources, wherein the set of multiple frequency resources is evenly distributed across the bandwidth of the sidelink feedback channel.

[0161] Additionally or alternatively, according to examples as disclosed herein, the communication manager 920 may support wireless communication at the first UE. The communication manager 920 may be configured to or otherwise support components for sending a sidelink message to at least a second UE via a set of resources of a sidelink channel. The communication manager 920 may be configured to or otherwise support components for receiving a set of multiple feedback indications associated with the sidelink message from the second UE via one or more configurable resources via a sidelink feedback channel according to an interleaving, the interleaving indication comprising a set of multiple frequency resources of the one or more configurable resources, wherein the set of multiple frequency resources is evenly distributed across the bandwidth of the sidelink feedback channel.

[0162] By including or configuring a communication manager 920 according to the examples described herein, the device 905 can support techniques for enhancing sidelink feedback indications, which can improve the reliability of sidelink communications and, therefore, improve device power consumption and user experience.

[0163] In some examples, the communication manager 920 may be configured to perform various operations (e.g., receive, monitor, transmit) using or otherwise cooperating with the transceiver 915, one or more antennas 925, or any combination thereof. Although the communication manager 920 is illustrated as a separate component, in some examples, one or more functions described with reference to the communication manager 920 may be supported or performed by the processor 940, the memory 930, the code 935, or any combination thereof. For example, the code 935 may include instructions executable by the processor 940 to cause the device 905 to perform various aspects of the sidelink feedback for increasing capacity as described herein, or the processor 940 and the memory 930 may be otherwise configured to perform or support such operations.

[0164] Fig.10 A flow chart illustrating a method 1000 for supporting sidelink feedback for increasing capacity according to one or more aspects of the present disclosure is shown. The operations of the method 1000 may be implemented by a UE or a component thereof as described herein. For example, the operations of the method 1000 may be implemented by a UE or a component thereof as described in reference to Figures 1 to 9 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.

[0165] At 1005, the method may include receiving a sidelink message from a second UE via a resource set of a sidelink channel. The operations of 1005 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1005 may be performed as described in reference to Figure 8 The side link message receiver 825 is used to perform.

[0166] At 1010, the method may include generating a set of multiple feedback indications based at least on the side link message. The operations of 1010 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1010 may be performed as described in reference to Figure 8 The feedback generator 830 is used to perform the above operation.

[0167] At 1015, the method may include sending a set of multiple feedback indications to a second UE via a sidelink feedback channel and via one or more configurable resources according to an interleaving, the interleaved indications including a set of multiple frequency resources of the one or more configurable resources, wherein the set of multiple frequency resources is evenly distributed across the bandwidth of the sidelink feedback channel. The operations of 1015 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1015 may be performed as described in reference to Figure 8 The feedback indication transmitter 835 is executed.

[0168] Fig.11 A flow chart illustrating a method 1100 for supporting sidelink feedback for increasing capacity according to one or more aspects of the present disclosure is shown. The operations of the method 1100 may be implemented by a UE or a component thereof as described herein. For example, the operations of the method 1100 may be implemented by a UE or a component thereof as described herein. Figures 1 to 9 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.

[0169] At 1105, the method may include receiving a sidelink message from a second UE via a resource set of a sidelink channel. The operations of 1105 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1105 may be performed as described in reference to Figure 8 The side link message receiver 825 is used to perform.

[0170] At 1110, the method may include generating a set of multiple feedback indications based at least on the side link message. The operations of 1110 may be performed according to examples disclosed herein. In some examples, aspects of the operations of 1110 may be performed as described in reference to Figure 8 The feedback generator 830 is used to perform the above operation.

[0171] At 1115, the method may include sending a set of multiple feedback indications to a second UE via a sidelink feedback channel and via one or more configurable resources according to an interleaving, the interleaved indications including a set of multiple frequency resources of the one or more configurable resources, wherein the set of multiple frequency resources is evenly distributed across the bandwidth of the sidelink feedback channel. The operations of 1115 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1115 may be performed as described in reference to Figure 8 The feedback indication transmitter 835 is executed.

[0172] At 1120, the method may include sending a first number of feedback indications at a first time and at a first transmit power via one or more configurable resources. The operations of 1120 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1120 may be performed as described in reference to Figure 8 The feedback indication transmitter 835 is executed.

[0173] At 1125, the method may include transmitting a second number of feedback indications at a second time and at a second transmit power via one or more configurable resources, wherein the first number is the same as the second number and the first transmit power is lower than the second transmit power. The operations of 1125 may be performed according to examples disclosed herein. In some examples, aspects of the operations of 1125 may be performed as described in reference to Figure 8 The feedback indication transmitter 835 is executed.

[0174] Fig.12 A flow chart illustrating a method 1200 for supporting sidelink feedback for increasing capacity 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 9 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.

[0175] At 1205, the method may include receiving a message including an indication of a number of feedback indications to be sent, a pattern associated with a set of multiple frequency resources, or both, wherein sending the set of multiple feedback indications is based on receiving the message. 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 Figure 8 The mode receiver 850 is used to perform the above operation.

[0176] At 1210, the method may include receiving a sidelink message from a second UE via a resource set of a sidelink channel. 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 Figure 8 The side link message receiver 825 is used to perform.

[0177] At 1215, the method may include generating a set of multiple feedback indications based at least on the side link message. 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 Figure 8 The feedback generator 830 is used to perform the above operation.

[0178] At 1220, the method may include sending a set of multiple feedback indications to a second UE via a sidelink feedback channel and via one or more configurable resources according to an interleaving, the interleaved indications including a set of multiple frequency resources of the one or more configurable resources, wherein the set of multiple frequency resources is evenly distributed across the bandwidth of the sidelink feedback channel. 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 Figure 8 The feedback indication transmitter 835 is executed.

[0179] Fig.13A flow chart illustrating a method 1300 for supporting sidelink feedback for increasing capacity 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 in reference to Figures 1 to 9 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.

[0180] At 1305, the method may include sending a sidelink message to at least a second UE via a resource set of the sidelink channel. 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 Figure 8 The side link message transmitter 840 is used to execute.

[0181] At 1310, the method may include receiving a set of multiple feedback indications associated with a sidelink message from a second UE via one or more configurable resources via a sidelink feedback channel according to an interleaving, the interleaved indications comprising a set of multiple frequency resources of the one or more configurable resources, wherein the set of multiple frequency resources is evenly distributed across a bandwidth of the sidelink feedback channel. 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 Figure 8 The feedback instructs the receiver 845 to execute.

[0182] Fig.14 A flow chart illustrating a method 1400 for supporting sidelink feedback for increasing capacity 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 9 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.

[0183] At 1405, the method may include sending a sidelink message to at least a second UE via a resource set of a sidelink channel. 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 Figure 8 The side link message transmitter 840 is used to execute.

[0184] At 1410, the method may include receiving a set of multiple feedback indications associated with a sidelink message from a second UE via one or more configurable resources via a sidelink feedback channel according to an interleaving, the interleaved indications comprising a set of multiple frequency resources of the one or more configurable resources, wherein the set of multiple frequency resources is evenly distributed across a bandwidth of the sidelink feedback channel. 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 Figure 8 The feedback instructs the receiver 845 to execute.

[0185] At 1415, the method may include receiving each feedback indication of a set of multiple feedback indications via a first cyclic shift pair in a first set of multiple cyclic shift pairs associated with a corresponding frequency resource in one or more configurable resources. 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 Figure 8 The feedback instructs the receiver 845 to execute.

[0186] Fig.15 A flow chart illustrating a method 1500 for supporting sidelink feedback for increasing capacity 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 9 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.

[0187] At 1505, the method may include sending a sidelink message to at least a second UE via a resource set of the sidelink channel. 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 Figure 8 The side link message transmitter 840 is used to execute.

[0188] At 1510, the method may include receiving a set of multiple feedback indications associated with a sidelink message from a second UE via one or more configurable resources via a sidelink feedback channel according to an interleaving, the interleaved indications comprising a set of multiple frequency resources of the one or more configurable resources, wherein the set of multiple frequency resources is evenly distributed across a bandwidth of the sidelink feedback channel. 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 Figure 8 The feedback instructs the receiver 845 to execute.

[0189] At 1515, the method may include receiving the feedback indication, the dummy signal, or both at a power below a threshold power based on a number of frequency resources between a first frequency resource in one or more configurable resources for a feedback indication in a set of multiple feedback indications and a second frequency resource for a dummy signal associated with a second interlace exceeding a threshold number of frequency resources. 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 Figure 8 The feedback instructs the receiver 845 to execute.

[0190] The following provides an overview of various aspects of the disclosure:

[0191] Aspect 1: A method for performing wireless communications at a first UE, the method comprising: receiving a sidelink message from a second UE via a resource set of a sidelink channel; generating multiple feedback indications based at least on the sidelink message; and sending the multiple feedback indications to the second UE via a sidelink feedback channel and via one or more configurable resources according to interleaving, the interleaved indications comprising multiple frequency resources of the one or more configurable resources, wherein the multiple frequency resources are evenly distributed across the bandwidth of the sidelink feedback channel.

[0192] Aspect 2: According to the method described in Aspect 1, the method further includes: sending a first number of feedback indications at a first transmission power via the one or more configurable resources at a first time; and sending a second number of feedback indications at a second transmission power via the one or more configurable resources at a second time, wherein the first number is the same number as the second number, and the first transmission power is lower than the second transmission power.

[0193] Aspect 3: A method according to any one of Aspects 1 to 2, wherein sending the multiple feedback indications comprises: sending each of the multiple feedback indications via a first cyclic shift pair in a first plurality of cyclic shift pairs via a corresponding frequency resource in the one or more configurable resources, wherein each of the multiple frequency resources comprises multiple cyclic shift pairs corresponding to multiple cyclic shift pair indices.

[0194] Aspect 4: A method according to Aspect 3, wherein sending the multiple feedback indications via the one or more configurable resources includes: sending one or more dummy signals via a remaining number of frequency resources in the multiple frequency resources, wherein each of the one or more dummy signals is sent via a second cyclic shift pair in a second plurality of cyclic shift pairs associated with a corresponding frequency resource in the remaining number of frequency resources, wherein the second cyclic shift pair is a first reserved cyclic shift pair for sending dummy signals.

[0195] Aspect 5: The method according to aspect 4, wherein the cyclic shift pair index of the first reserved cyclic shift pair of the corresponding frequency resource is offset from the cyclic shift pair index of the second reserved cyclic shift pair of the subsequent frequency resource in the multiple frequency resources.

[0196] Aspect 6: According to the method described in any one of Aspects 1 to 5, the method also includes: receiving a message including an indication of the number of feedback indications to be sent, a pattern associated with the multiple frequency resources, or both, wherein the multiple feedback indications are sent at least in part based on the message.

[0197] Aspect 7: A method according to any one of Aspects 1 to 6, wherein the side link channel comprises multiple interlaces, and the multiple frequency resources are associated with a first interlace among the multiple interlaces, and the method further comprises: sending the multiple feedback indications via the first interlace among the multiple interlaces that is different from a second interlace among the multiple interlaces, wherein the second interlace is a common interlace.

[0198] Aspect 8: According to the method described in Aspect 7, the method also includes: sending the feedback indication, the dummy signal or both according to a transmission power lower than a threshold power, at least in part based on the number of frequency resources between the first frequency resource in the one or more configurable resources for the feedback indication in the multiple feedback indications and the second frequency resource for the dummy signal associated with the second interleaving exceeding a threshold number of frequency resources.

[0199] Aspect 9: A method according to any one of Aspects 1 to 8, wherein the interleaving includes multiple interleavings, and the multiple frequency resources are associated with a first interleaving among the multiple interleavings, a second interleaving among the multiple interleavings that is different from the first interleaving, or both, and the method further includes: sending the multiple feedback indications via the first interleaving, the second interleaving, or both, wherein the second interleaving is a common interleaving.

[0200] Aspect 10: According to the method described in any one of Aspects 1 to 9, the method further includes: sending the multiple feedback indications via a first subset of the multiple frequency resources, wherein the first subset includes the one or more configurable resources; and sending one or more dummy signals via the remaining frequency resources in the first subset, via one or more frequency resources in the second subset of the multiple frequency resources, or both.

[0201] Aspect 11: According to the method described in any one of Aspects 1 to 10, the method further includes: receiving an indication to send the multiple feedback indications via a first resource pool or a second resource pool, wherein the first resource pool is a default resource pool and the second resource pool is a capacity enhancement resource pool.

[0202] Aspect 12: The method according to aspect 11, wherein the first resource pool and the second resource pool are multiplexed across the bandwidth of the side link channel according to a frequency division multiplexing scheme, a time division multiplexing scheme, a code division multiplexing scheme, or any combination thereof.

[0203] Aspect 13: The method according to any one of aspects 11 to 12, wherein the indication is received via a downlink control information message, a medium access control control element or a radio resource control message.

[0204] Aspect 14: A method for performing wireless communications at a first UE, the method comprising: sending a sidelink message to at least a second UE via a resource set of a sidelink channel; and receiving multiple feedback indications associated with the sidelink message from the second UE via a sidelink feedback channel via one or more configurable resources according to interleaving, the interleaved indications comprising multiple frequency resources of the one or more configurable resources, wherein the multiple frequency resources are evenly distributed across the bandwidth of the sidelink feedback channel.

[0205] Aspect 15: According to the method described in Aspect 14, the method also includes: receiving a first number of feedback indications at a first power via the one or more configurable resources at a first time; and receiving a second number of feedback indications at a second power via the one or more configurable resources at a second time, wherein the first number is less than the second number, and the first power is lower than the second power.

[0206] Aspect 16: A method according to any one of Aspects 14 to 15, wherein receiving the multiple feedback indications includes: receiving each of the multiple feedback indications via a first cyclic shift pair among a plurality of cyclic shift pairs of a corresponding frequency resource among the multiple frequency resources, wherein each of the multiple frequency resources includes the multiple cyclic shift pairs corresponding to a plurality of cyclic shift pair indices.

[0207] Aspect 17: A method according to Aspect 16, wherein receiving the multiple feedback indications via the one or more configurable resources includes: receiving one or more dummy signals via a remaining number of frequency resources in the multiple frequency resources, wherein each of the one or more dummy signals is received via a second cyclic shift pair of a second plurality of cyclic shift pairs associated with a corresponding frequency resource in the remaining number of frequency resources, wherein the second cyclic shift pair is a first reserved cyclic shift pair for conveying the dummy signal.

[0208] Aspect 18: The method according to Aspect 17, wherein a first cyclic shift pair index of the first reserved cyclic shift pair of the corresponding frequency resource is offset from a second cyclic shift pair index of a second reserved cyclic shift pair of a subsequent frequency resource in the plurality of frequency resources.

[0209] Aspect 19: According to any one of Aspects 14 to 18, the method further includes: sending a message including an indication of the number of feedback indications to be sent to the second UE, a pattern associated with the multiple frequency resources, or both, wherein receiving the multiple feedback indications is at least partially based on sending the message.

[0210] Aspect 20: A method according to any one of Aspects 14 to 19, wherein the side link channel comprises a plurality of interlaces, and the plurality of frequency resources are associated with a first interlace among the plurality of interlaces, the method further comprising: receiving the plurality of feedback indications via the first interlace that is different from a second interlace among the plurality of interlaces, wherein the second interlace is a common interlace.

[0211] Aspect 21: According to the method described in any one of Aspects 14 to 20, the method further includes: sending the feedback indication, the dummy signal, or both according to a power lower than a threshold power, at least in part based on the number of frequency resources between the first frequency resource in the one or more configurable resources for the feedback indication in the multiple feedback indications and the second frequency resource for the dummy signal associated with the second interleaving exceeding a threshold number of frequency resources.

[0212] Aspect 22: A method according to any one of Aspects 14 to 21, wherein the interleaving includes multiple interleavings, and the multiple frequency resources are associated with a first interleaving among the multiple interleavings, a second interleaving among the multiple interleavings that is different from the first interleaving, or both, and the method further includes: receiving the multiple feedback indications via the first interleaving, the second interleaving, or both, wherein the second interleaving is a common interleaving.

[0213] Aspect 23: According to the method described in any one of Aspects 14 to 22, the method further includes: receiving the multiple feedback indications via a first subset of the multiple frequency resources, wherein the first subset includes the one or more configurable resources; and receiving one or more dummy signals via the remaining frequency resources in the first subset, via one or more frequency resources in the second subset of the multiple frequency resources, or both.

[0214] Aspect 24: According to the method described in any one of Aspects 14 to 23, the method further includes: sending an indication that the second UE sends the multiple feedback indications via a first resource pool or a second resource pool, wherein the first resource pool is a default resource pool and the second resource pool is a capacity enhancement resource pool.

[0215] Aspect 25: The method according to Aspect 24, wherein the first resource pool and the second resource pool are multiplexed across the bandwidth of the side link channel according to a frequency division multiplexing scheme, a time division multiplexing scheme, a code division multiplexing scheme, or any combination thereof.

[0216] Aspect 26: The method according to any one of aspects 24 to 25, wherein the indication is sent via a downlink control information message, a medium access control control element or a radio resource control message.

[0217] Aspect 27: An apparatus for performing wireless communications at a first UE, the apparatus comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method according to any one of Aspects 1 to 13.

[0218] Aspect 28: An apparatus for wireless communication at a first UE, the apparatus comprising at least one component for performing a method according to any one of aspects 1 to 13.

[0219] Aspect 29: A non-transitory computer-readable medium storing code for wireless communication at a first UE, the code comprising instructions executable by a processor to perform the method according to any one of aspects 1 to 13.

[0220] Aspect 30: An apparatus for performing wireless communications at a first UE, the apparatus comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method according to any one of Aspects 14 to 26.

[0221] Aspect 31: An apparatus for wireless communication at a first UE, the apparatus comprising at least one component for performing a method according to any one of aspects 14 to 26.

[0222] Aspect 32: A non-transitory computer-readable medium storing code for wireless communication at a first UE, the code comprising instructions executable by a processor to perform the method according to any one of aspects 14 to 26.

[0223] 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.

[0224] 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 techniques described 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.

[0225] 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.

[0226] 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, 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, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration).

[0227] 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 this 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 a combination of any 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.

[0228] Computer-readable medium includes both non-transient computer storage medium and communication medium, and it includes any medium that facilitates computer program to be transmitted 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, fiber optic cable, twisted pair, digital subscriber line (DSL) or wireless technology such as infrared, radio and microwave, then coaxial cable, fiber optic cable, twisted pair, DSL or wireless technology such as infrared, radio and microwave are included in the definition of computer-readable medium. As used herein, disk and disc include CD, laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc. Disks can reproduce data magnetically, while discs can reproduce data optically using lasers. Combinations of the above are also included within the scope of computer readable media.

[0229] As used herein (including in the claims), "or" used in a list of items (e.g., a list of items introduced by 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" may be based on both 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".

[0230] The term "determining" encompasses a wide 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, etc. Furthermore, "determining" may include receiving (e.g., receiving information), accessing (e.g., accessing data stored in a memory), etc. Furthermore, "determining" may include parsing, retrieving, selecting, choosing, establishing, and other such similar actions.

[0231] In the drawings, similar components or features may have the same reference label. In addition, components of the same type may be distinguished by following the reference label with a dash and a second label to distinguish between 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.

[0232] 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," rather than "preferred" or "advantageous over other examples." The specific embodiments include specific details to provide an understanding of the described techniques. However, these techniques may be practiced without these specific details. In some cases, known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described examples.

[0233] 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. Thus, 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 first user equipment (UE), the apparatus comprising: processor; a memory coupled to the processor; as well as instructions stored in the memory and executable by the processor to cause the apparatus to: receiving a sidelink message from a second UE via the set of resources of the sidelink channel; generating a plurality of feedback indications based at least on the sidelink message; as well as The plurality of feedback indications are sent to the second UE via a sidelink feedback channel and via one or more configurable resources according to an interleaving, the interleaved indications comprising a plurality of frequency resources of the one or more configurable resources, wherein the plurality of frequency resources are evenly distributed across a bandwidth of the sidelink feedback channel.

2. The apparatus of claim 1 , wherein the instructions are further executable by the processor to cause the apparatus to: transmitting a first number of feedback indications via the one or more configurable resources at a first time and at a first transmit power; and A second number of feedback indications is transmitted via the one or more configurable resources at a second time and at a second transmit power, wherein the first number is the same number as the second number and the first transmit power is lower than the second transmit power.

3. The apparatus of claim 1 , wherein the instructions for sending the plurality of feedback indications are executable by the processor to cause the apparatus to: Each of the plurality of feedback indications is sent via a first cyclic shift pair of a first plurality of cyclic shift pairs via a corresponding frequency resource of the one or more configurable resources, wherein each frequency resource of the plurality of frequency resources includes a plurality of cyclic shift pairs corresponding to a plurality of cyclic shift pair indices.

4. The apparatus of claim 3, wherein the instructions for sending the plurality of feedback indications via the one or more configurable resources are executable by the processor to cause the apparatus to: One or more dummy signals are sent via a remaining number of frequency resources in the plurality of frequency resources, wherein each of the one or more dummy signals is sent via a second cyclic shift pair in a second plurality of cyclic shift pairs associated with a corresponding frequency resource in the remaining number of frequency resources, wherein the second cyclic shift pair is a first reserved cyclic shift pair for sending the dummy signal.

5. The apparatus of claim 4, wherein a cyclic shift pair index of the first reserved cyclic shift pair for the corresponding frequency resource is offset from a cyclic shift pair index of a second reserved cyclic shift pair for a subsequent frequency resource in the plurality of frequency resources.

6. The apparatus of claim 1, wherein the instructions are further executable by the processor to cause the apparatus to: A message is received including an indication of a number of feedback indications to send, a pattern associated with the plurality of frequency resources, or both, wherein the plurality of feedback indications are sent based at least in part on the message.

7. The apparatus of claim 1 , wherein the sidelink channel comprises a plurality of interlaces, and the plurality of frequency resources are associated with a first interlace of the plurality of interlaces, and the instructions are further executable by the processor to cause the apparatus to: The plurality of feedback indications are sent via a first interlace of the plurality of interlaces that is different from a second interlace of the plurality of interlaces, wherein the second interlace is a common interlace.

8. The apparatus of claim 7, wherein the instructions are further executable by the processor to cause the apparatus to: The feedback indication, the dummy signal, or both are transmitted according to a transmit power below a threshold power based at least in part on a number of frequency resources between a first frequency resource in the one or more configurable resources for a feedback indication in the plurality of feedback indications and a second frequency resource for a dummy signal associated with the second interlace exceeding a threshold number of frequency resources.

9. The apparatus of claim 1, wherein the interlace comprises a plurality of interlaces, and the plurality of frequency resources are associated with a first interlace of the plurality of interlaces, and the instructions are further executable by the processor to cause the apparatus to: The plurality of feedback indications are sent via the first interlace, a second interlace, or both, wherein the second interlace is a common interlace.

10. The apparatus of claim 1, wherein the instructions are further executable by the processor to cause the apparatus to: transmitting the plurality of feedback indications via a first subset of the plurality of frequency resources, wherein the first subset includes the one or more configurable resources; and One or more dummy signals are sent via remaining frequency resources in the first subset, via one or more frequency resources in a second subset of the plurality of frequency resources, or both.

11. The apparatus of claim 1 , wherein the instructions are further executable by the processor to cause the apparatus to: An indication is received to send the plurality of feedback indications via a first resource pool or a second resource pool, wherein the first resource pool is a default resource pool and the second resource pool is a capacity enhancement resource pool.

12. The apparatus of claim 11, wherein the first resource pool and the second resource pool are multiplexed across the bandwidth of the sidelink channel according to a frequency division multiplexing scheme, a time division multiplexing scheme, a code division multiplexing scheme, or any combination thereof.

13. The apparatus of claim 11, wherein the indication is received via a downlink control information message, a medium access control control element, or a radio resource control message.

14. An apparatus for wireless communication at a first user equipment (UE), the apparatus comprising: processor; a memory coupled to the processor; as well as instructions stored in the memory and executable by the processor to cause the apparatus to: sending a sidelink message to at least a second UE via the set of resources of the sidelink channel; as well as A plurality of feedback indications associated with the sidelink message are received from the second UE via a sidelink feedback channel via one or more configurable resources according to the interleaving, the interleaved indications comprising a plurality of frequency resources of the one or more configurable resources, wherein the plurality of frequency resources are evenly distributed across a bandwidth of the sidelink feedback channel.

15. The apparatus of claim 14, wherein the instructions are further executable by the processor to cause the apparatus to: receiving a first number of feedback indications via the one or more configurable resources at a first time and at a first power; and A second number of feedback indications is received via the one or more configurable resources at a second time and at a second power, wherein the first number is less than the second number and the first power is lower than the second power.

16. The apparatus of claim 14, wherein the instructions for receiving the plurality of feedback indications are executable by the processor to cause the apparatus to: Each of the plurality of feedback indications is received via a first cyclic shift pair of a plurality of cyclic shift pairs of a corresponding frequency resource of the plurality of frequency resources, wherein each of the plurality of frequency resources comprises the plurality of cyclic shift pairs corresponding to a plurality of cyclic shift pair indices.

17. The apparatus of claim 16, wherein the instructions for receiving the plurality of feedback indications via the one or more configurable resources are executable by the processor to cause the apparatus to: One or more dummy signals are received via a remaining number of frequency resources in the plurality of frequency resources, wherein each of the one or more dummy signals is received via a second cyclic shift pair in a second plurality of cyclic shift pairs associated with a corresponding frequency resource in the remaining number of frequency resources, wherein the second cyclic shift pair is a first reserved cyclic shift pair for transmitting the dummy signal.

18. The apparatus of claim 17, wherein a first cyclic shift pair index of the first reserved cyclic shift pair for the corresponding frequency resource is offset from a second cyclic shift pair index of a second reserved cyclic shift pair for a subsequent frequency resource in the plurality of frequency resources.

19. The apparatus of claim 14, wherein the instructions are further executable by the processor to cause the apparatus to: and sending a message including an indication of a number of feedback indications to be sent by the second UE, a pattern associated with the plurality of frequency resources, or both, wherein receiving the plurality of feedback indications is based at least in part on sending the message.

20. The apparatus of claim 14, wherein the sidelink channel comprises a plurality of interlaces, and the plurality of frequency resources are associated with a first interlace of the plurality of interlaces, and the instructions are further executable by the processor to cause the apparatus to: The plurality of feedback indications are received via the first interlace that is different from a second interlace of the plurality of interlaces, wherein the second interlace is a common interlace.

21. The apparatus of claim 14, wherein the instructions are further executable by the processor to cause the apparatus to: The feedback indication, the dummy signal, or both are received according to a power below a threshold power based at least in part on a number of frequency resources between a first frequency resource in the one or more configurable resources for a feedback indication in the plurality of feedback indications and a second frequency resource for a dummy signal associated with a second interlace exceeding a threshold number of frequency resources.

22. The apparatus of claim 14, wherein the interlace comprises a plurality of interlaces, and the plurality of frequency resources are associated with a first interlace of the plurality of interlaces, and the instructions are further executable by the processor to cause the apparatus to: The plurality of feedback indications are received via the first interlace, a second interlace, or both, wherein the second interlace is a common interlace.

23. The apparatus of claim 14, wherein the instructions are further executable by the processor to cause the apparatus to: receiving the plurality of feedback indications via a first subset of the plurality of frequency resources, wherein the first subset includes the one or more configurable resources; and One or more dummy signals are received via remaining frequency resources in the first subset, via one or more frequency resources in a second subset of the plurality of frequency resources, or both.

24. The apparatus of claim 14, wherein the instructions are further executable by the processor to cause the apparatus to: An indication is sent that the second UE sends the plurality of feedback indications via a first resource pool or a second resource pool, wherein the first resource pool is a default resource pool and the second resource pool is a capacity enhancement resource pool.

25. The apparatus of claim 24, wherein the first resource pool and the second resource pool are multiplexed across the bandwidth of the sidelink channel according to a frequency division multiplexing scheme, a time division multiplexing scheme, a code division multiplexing scheme, or any combination thereof.

26. The apparatus of claim 24, wherein the indication is sent via a downlink control information message, a medium access control control element, or a radio resource control message.

27. A method for wireless communication at a first user equipment (UE), the method comprising: receiving a sidelink message from a second UE via the set of resources of the sidelink channel; generating a plurality of feedback indications based at least on the sidelink message; as well as The plurality of feedback indications are sent to the second UE via a sidelink feedback channel and via one or more configurable resources according to an interleaving, the interleaved indications comprising a plurality of frequency resources of the one or more configurable resources, wherein the plurality of frequency resources are evenly distributed across a bandwidth of the sidelink feedback channel.

28. The method according to claim 27, further comprising: transmitting a first number of feedback indications via the one or more configurable resources at a first transmit power at a first time; as well as A second number of feedback indications is transmitted via the one or more configurable resources at a second time and at a second transmit power, wherein the first number is the same number as the second number and the first transmit power is lower than the second transmit power.

29. A method for wireless communication at a first user equipment (UE), the method comprising: sending a sidelink message to at least a second UE via the set of resources of the sidelink channel; as well as A plurality of feedback indications associated with the sidelink message are received from the second UE via a sidelink feedback channel via one or more configurable resources according to the interleaving, the interleaved indications comprising a plurality of frequency resources of the one or more configurable resources, wherein the plurality of frequency resources are evenly distributed across a bandwidth of the sidelink feedback channel.

30. The method according to claim 29, further comprising: receiving a first number of feedback indications via the one or more configurable resources at a first time and at a first power; as well as A second number of feedback indications is received via the one or more configurable resources at a second time and at a second power, wherein the first number is less than the second number and the first power is lower than the second power.

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