Sending sidelink feedback messages according to sidelink slot structure

Abstract

Methods, systems, and devices for wireless communication are described. A user equipment (UE) may participate in sidelink communications using a sidelink slot structure that includes a set of periodic automatic gain control (AGC) candidate transmit time intervals (TTIs) that is common across a wireless network. The UE may monitor a sidelink message during an interval according to a common set of periodic AGC TTIs, and the UE may transmit a sidelink feedback message in response to the sidelink message. If the format of the sidelink feedback message is associated with an uplink control channel format 0, the UE may transmit the sidelink feedback message on a set of resource blocks (RBs) of a sidelink slot structure. Alternatively, if the format is associated with an uplink control channel format 2, the UE may transmit a sidelink feedback message on more than two symbols of the sidelink slot structure.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This Patent Application claims priority to U.S. Patent Application No. 18 / 467,573 by LIU et al., entitled “TRANSMITTING A Sidelink Feedback Message According to a Sidelink Slot Structure,” filed September 14, 2023, assigned to the assignee of the present application and fully incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The following relates to wireless communications, including transmitting a sidelink feedback message according to a sidelink slot structure. BACKGROUND

[0004] Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems can be capable of supporting communication with multiple users by sharing the 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, LTE-Advanced (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems which can be referred to as New Radio (NR) systems. These systems can employ technologies such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal FDMA (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple-access communications system can include one or more base stations, each simultaneously supporting communication with multiple communication devices, which can be otherwise known as user equipment (UE).

[0005] In some examples, a UE can use different slot structures for data transmission in different frequency ranges. Such slot structures can include a data transmission time interval (TTI) in which the UE can transmit feedback for data and one or more automatic gain control (AGC) TTIs that can precede a set of data TTIs. The slot structure can include a configurable number of resource blocks (RBs) that can enable the UE to transmit data at a maximum transmit power. However, techniques for maintaining full transmit power using dynamic sidelink structures that include multiple AGC symbols or slots can be improved. SUMMARY

[0006] The described techniques relate to improved methods, systems, devices, and apparatuses that support transmitting sidelink feedback messages according to a sidelink slot structure. For example, the described techniques provide formats for transmitting a sidelink feedback message for a dynamic sidelink slot structure in frequency range (FR) 2-2. A first user equipment (UE) can participate in a sidelink communication with a second UE using a sidelink slot structure. The sidelink slot structure can include a set of periodic automatic gain control (AGC) transmission time intervals (TTIs) (e.g., slots, symbols) that can be common across wireless networks. The first UE can monitor for a sidelink message during a monitoring interval, which can be associated with an AGC TTI in the sidelink slot format of the slot. For example, the UE can monitor for the sidelink message in one or more slots or symbols that are just after the AGC TTI. In some examples, the UE can transmit a sidelink feedback message, where a format of the sidelink feedback message can be associated with an uplink control channel format and the sidelink slot structure. For example, if the format of the sidelink feedback message is associated with a physical uplink control channel (PUCCH) format 0, the UE can transmit the sidelink feedback message on a set of resource blocks (RBs) of the sidelink slot structure. Alternatively, if the format of the sidelink feedback message is associated with a PUCCH format 2, the UE can transmit the sidelink feedback message on more than two symbols of the sidelink slot structure.

[0007] A method for wireless communication by a UE is described. The method can include participating in a sidelink communication according to a sidelink slot structure used in a wireless network, where the sidelink slot structure includes a set of periodic AGC candidate TTIs that are common across the wireless network, monitoring for a sidelink message during a monitoring interval associated with the set of periodic AGC candidate TTIs in the sidelink slot structure, and transmitting a sidelink feedback message according to the monitoring, where a format of the sidelink feedback message is associated with an uplink control channel format 0 and the sidelink feedback message is transmitted on a set of multiple RBs of the link slot structure, or where the format is associated with an uplink control channel format 2 and the sidelink feedback message is transmitted on more than two symbols of the sidelink slot structure.

[0008] A UE for wireless communication is described. The UE can include one or more memories storing processor-executable code and one or more processors coupled with the one or more memories. The one or more processors can be individually or collectively capable of operating to execute the code to cause the UE to participate in sidelink communications according to a sidelink slot structure used in a wireless network, where the sidelink slot structure includes a set of periodic AGC candidate TTIs that are common across the wireless network, monitor for a sidelink message during a monitoring interval associated with the set of periodic AGC candidate TTIs in the sidelink slot structure, and transmit a sidelink feedback message according to the monitoring, where a format of the sidelink feedback message is associated with uplink control channel format 0 and the sidelink feedback message is transmitted on a set of multiple RBs of the sidelink slot structure, or where the format is associated with uplink control channel format 2 and the sidelink feedback message is transmitted on more than two symbols of the sidelink slot structure.

[0009] Another UE for wireless communication is described. The UE can include means for participating in sidelink communications according to a sidelink slot structure used in a wireless network, where the sidelink slot structure includes a set of periodic AGC candidate TTIs that are common across the wireless network, means for monitoring for a sidelink message during a monitoring interval associated with the set of periodic AGC candidate TTIs in the sidelink slot structure, and means for transmitting a sidelink feedback message according to the monitoring, where a format of the sidelink feedback message is associated with uplink control channel format 0 and the sidelink feedback message is transmitted on a set of multiple RBs of the sidelink slot structure, or where the format is associated with uplink control channel format 2 and the sidelink feedback message is transmitted on more than two symbols of the sidelink slot structure.

[0010] A non-transitory computer-readable medium storing code for wireless communication is described. The code can include instructions executable by a processor to participate in sidelink communications according to a sidelink slot structure used in a wireless network, where the sidelink slot structure includes a set of periodic AGC candidate TTIs that are common across the wireless network, monitor for a sidelink message during a monitoring interval associated with the set of periodic AGC candidate TTIs in the sidelink slot structure, and transmit a sidelink feedback message according to the monitoring, where a format of the sidelink feedback message is associated with uplink control channel format 0 and the sidelink feedback message is transmitted on a set of multiple RBs of the sidelink slot structure, or where the format is associated with uplink control channel format 2 and the sidelink feedback message is transmitted on more than two symbols of the sidelink slot structure. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1An example of a wireless communications system that supports transmitting sidelink feedback messages according to a sidelink slot structure is shown, in accordance with one or more aspects of the present disclosure.

[0012] Figure 2 An example of a wireless communications system that supports transmitting sidelink feedback messages according to a sidelink slot structure is shown, in accordance with one or more aspects of the present disclosure.

[0013] Figure 3 An example of a sidelink slot structure that supports transmitting sidelink feedback messages according to a sidelink slot structure is shown, in accordance with one or more aspects of the present disclosure.

[0014] Figure 4 An example of a process flow that supports transmitting sidelink feedback messages according to a sidelink slot structure is shown, in accordance with one or more aspects of the present disclosure.

[0015] Figure 5 And Figure 6 A block diagram of a device that supports transmitting sidelink feedback messages according to a sidelink slot structure is shown, in accordance with one or more aspects of the present disclosure.

[0016] Figure 7 A block diagram of a communications manager that supports transmitting sidelink feedback messages according to a sidelink slot structure is shown, in accordance with one or more aspects of the present disclosure.

[0017] Figure 8 A diagram of a system including a device that supports transmitting sidelink feedback messages according to a sidelink slot structure is shown, in accordance with one or more aspects of the present disclosure.

[0018] Figures 9 to 12 A flow diagram illustrating a method that supports transmitting sidelink feedback messages according to a sidelink slot structure is shown, in accordance with one or more aspects of the present disclosure. DETAILED DESCRIPTION

[0019] Some user equipment (UEs) can communicate with different slot structures depending on the type of data to be transmitted. Wireless communications systems (e.g., New Radio (NR)) can support scalable numerologies (15 kHz, 30 kHz, 60 kHz, 120 kHz, etc.) and variable slot durations (0.5 ms, 0.25 ms, 0.125 ms, etc.). Each slot structure can include downlink control information (DCI), downlink data, uplink data, uplink control information, timing slots (e.g., guard periods), or any combination thereof. In some cases, the traffic conditions of a UE 115 can include traffic bursts (e.g., downlink heavy or uplink heavy traffic at certain times or on certain frequencies), or the channel conditions of a UE 115 can change over time (e.g., from the edge of a cell to the center of a cell). Moreover, the set of UEs 115 scheduled at a cell can change over time, and the slot structure for downlink, uplink, or sidelink (e.g., use of physical sidelink control channel (PSCCH) and physical sidelink shared channel (PSSCH) formats) can change over time.

[0020] To account for different data types and channel conditions, a UE supporting sidelink communications (e.g., a sidelink UE) can communicate using a particular sidelink slot structure for a particular frequency range (FR). Such sidelink slot structures can be dynamic, such that a UE can change the sidelink slot structure it uses based on changing data or channel conditions. For example, a UE can use a first sidelink slot structure when operating in a first FR. If the UE experiences a change in traffic conditions in the first FR, the sidelink slot structure can dynamically change to better handle the traffic.

[0021] In one example, for FR2-2, a sidelink slot structure can include a periodic set of automatic gain control (AGC) candidate slots or symbols, where each data transmission (e.g., PSCCH or PSSCH transmission) can occur on one or more slots or symbols after an AGC slot or symbol in the sidelink slot structure. In addition, a sidelink UE can transmit feedback (e.g., a physical sidelink feedback channel (PSFCH) transmission) in one or more slots or symbols after an AGC slot or symbol in the sidelink slot structure. Each AGC slot or symbol can enable a UE to monitor and / or change a gain of a received signal such that a signal strength falls within a range that the UE is able to process. For example, AGC measurements can include a received signal strength indicator (RSSI) measurement, amplifier tuning (e.g., low noise amplifier (LNA) tuning), and RSSI measurement refinement. In some examples, operating in a relatively higher FR (e.g., FR2-1 or FR2-2) with a relatively higher subcarrier spacing (SCS) (e.g., 120 kHz) can result in a shorter symbol duration, and thus, a UE 115 can be unable to complete AGC using a single AGC symbol.

[0022] In some examples, a number of AGC slots or symbols (also referred to as transmission time intervals (TTIs)) in a sidelink slot structure, as well as a number and location of data TTIs, can be based on or associated with different numerologies. For example, for a 120 kHz SCS, a sidelink slot structure can support four-symbol AGC candidate TTIs, data TTIs (e.g., PSSCH TTIs, PSCCH TTIs), and a one-symbol gap in a last PSSCH slot. In addition, a sidelink slot structure can support four-symbol AGC candidate TTIs, a half-symbol PSFCH TTI (i.e., a half-symbol PSFCH symbol), and one or more gaps (e.g., one or more gap symbols). In some other examples, for a 480 kHz SCS, a sidelink slot structure can support one AGC candidate TTI (e.g., one AGC candidate slot), multiple data TTIs, and at least a four-symbol gap (e.g., a transmission / reception gap) in a last PSSCH slot. In addition, a sidelink slot structure can support one AGC candidate TTI (e.g., one AGC candidate slot) followed by a PSFCH TTI (e.g., a PSFCH slot) and at least a four-symbol gap.

[0023] In some aspects, for example, in FR2-2 Uu communications (e.g., uplink and downlink communications between a UE and a network entity), PUCCH formats 0, 1, 3, and 4 can be enhanced to occupy a configurable number of RBs, such that a UE can transmit a PUCCH at maximum power under an effective isotropic radiated power (EIRP) limit. However, for sidelink communications, current techniques can lack support for DFT-precoded PUCCH formats (e.g., PUCCH formats 3 and 4). Further, a UE can support a multi-bit format (e.g., PUCCH format 2) to carry a HARQ codebook, however PUCCH format 2 can be limited to occupying up to two symbols, making PSFCH slots inefficient in a sidelink slot structure. That is, a PSFCH based on PUCCH format 2 can not be allowed to span more than two symbols. Further, a PSFCH based on PUCCH format 0 can not be allowed to occupy more than one RB, which can result in coverage issues under an EIRP limit. Thus, a wireless communication system can support enhancements to PSFCH waveforms for sidelink communications in FR2-2 to support full transmit power of a UE and fit a sidelink slot structure that can include multiple AGC symbols or slots (AGC candidate TTIs).

[0024] For uplink and downlink Uu communications in FR2-2 (e.g., uplink and downlink communications between a UE and a network entity), PUCCH formats 0, 1, 3, and 4 can be enhanced to occupy a configurable number of resource blocks (RBs), such that a UE can transmit a PUCCH at maximum power. However, in sidelink communications, a sidelink slot structure including periodic AGC slots or symbols can be limited, and thus can not support full transmit power of a UE and can reduce utilization efficiency of time resources and frequency resources (e.g., if a physical sidelink shared channel (PSFCH) uses half of the available symbols, the remaining symbols can not be used). For example, PUCCH formats 3 and 4 can not be supported for sidelink communications, and other PUCCH formats (e.g., PUCCH format 2) can support a limited number of slots or symbols, which can result in inefficiency in a sidelink slot structure for FR2-2 (specifically with respect to PSFCH slots or symbols). That is, a PSFCH based on PUCCH format 2 can not be allowed to span more than two symbols. Further, a PSFCH based on PUCCH format 0 can not be allowed to occupy more than one RB. Thus, for a sidelink slot structure in FR2-2, PSFCH transmissions can be limited.

[0025] The techniques described herein support formats for transmitting sidelink feedback messages for dynamic sidelink slot structures in FR2-2. A first UE can participate in sidelink communications with a second UE using a sidelink slot structure that includes a set of periodic AGC transmission time intervals (TTIs) (e.g., slots, symbols) that can be common across a wireless network. The first UE can monitor for a sidelink message (e.g., PSSCH, PSCCH, or other data) during a monitoring interval associated with an AGC TTI in the sidelink slot format. For example, the UE can monitor for the sidelink message in one or more slots or symbols immediately after the AGC TTI. In some examples, the UE can transmit a sidelink feedback message (e.g., PSFCH), where a format of the sidelink feedback message can be associated with an uplink control channel format and the sidelink slot structure. For example, if the format of the sidelink feedback message is associated with PUCCH format 0, the UE can transmit the sidelink feedback message on a set of RBs of the sidelink slot structure. Alternatively, if the format of the sidelink feedback message is associated with PUCCH format 2, the UE can transmit the sidelink feedback message on more than two symbols of the sidelink slot structure.

[0026] In some aspects, the UE can transmit the PSFCH on the set of RBs through transmission of one or more PSFCH repetitions or through transmission of a sequence, where a length of the sequence is associated with the set of RBs. Alternatively, the UE can transmit the PSFCH on the set of RBs through transmission of one or more PSFCH repetitions on the set of RBs and on multiple symbols. In such cases, the UE can apply a time domain orthogonal cover code (TD-OCC) to the transmission of the PSFCH repetitions. In some implementations, the UE can receive a control message prior to the transmission of the PSFCH, where the control message can indicate, on a per-resource pool basis, a number of RBs and a starting RB in the set of RBs on which the transmission of the PSFCH is to begin. In some examples, the control message can indicate a bitmap corresponding to the set of RBs.

[0027] In some aspects, the UE can support PUCCH format 2 based PSFCH transmission, where the UE can transmit the PSFCH on more than two symbols according to mapping of the more than two symbols to a number of RBs of the sidelink slot structure. Additionally or alternatively, the UE can repeat the PSFCH on a per-symbol number basis and apply a TD-OCC to the repetitions. In such cases, the UE can multiplex the PSFCH repetitions based on CDM, which is based on the applied TD-OCC and an applied frequency domain OCC (FD-OCC).

[0028] Particular aspects of the subject matter described in this disclosure can be implemented to realize one or more of the following potential advantages. In some implementations, by supporting a format for transmitting a sidelink feedback message for a dynamic sidelink slot structure in FR2-2, a UE can improve and extend coverage, improve power consumption, and increase signaling throughput. For example, by transmitting a PSFCH using a dynamic slot structure via transmission of a PSFCH repetition set, a UE can support the capacity of multiplexing UEs, thereby increasing signaling throughput and optimizing power consumption. Further, by transmitting a PSFCH over more than two symbols according to a certain number of RBs mapping more than two symbols to a sidelink slot structure, a UE can improve the efficiency of the slot structure, which can enable the UE to transmit at maximum transmit power.

[0029] Aspects of the disclosure are first described in the context of a wireless communications system. Aspects of the disclosure are then described in the context of sidelink slot structures and process flows. Aspects of the disclosure are further illustrated by and described in conjunction with apparatus diagrams, system diagrams, and flowcharts related to transmitting sidelink feedback messages according to sidelink slot structures.

[0030] Figure 1 An example of a wireless communications system 100 that supports transmitting sidelink feedback messages according to sidelink slot structures is shown in accordance with one or more aspects of the present disclosure. The wireless communications system 100 can include one or more network entities 105, one or more UEs 115, and a core network 130. In some examples, the wireless communications system 100 can be a Long Term Evolution (LTE) network, a LTE-Advanced (LTE-A) network, a LTE-A Pro network, a New Radio (NR) network, or a network operating according to some other wireless communications standard or radio technology including future iterations of the aforementioned systems and radio technologies not expressly mentioned herein.

[0031] The network entities 105 can be dispersed throughout the geographic area of the wireless communications system 100, and can be representative of devices or equipment in different forms or having different capabilities. In various examples, the network entities 105 can be referred to as network elements, mobility elements, radio access network (RAN) nodes, or network equipment, among other examples. In some examples, the network entities 105 and UEs 115 can wirelessly communicate via one or more communication links 125 (e.g., radio frequency (RF) access links). For example, a network entity 105 can support a coverage area 110 (e.g., a geographic coverage area) within which UEs 115 and the network entity 105 can establish one or more communication links 125. The coverage area 110 can be an example of a geographic area in which the network entity 105 and the UEs 115 support communication in accordance with one or more radio access technologies (RATs).

[0032] The UEs 115 can be dispersed throughout the coverage areas 110 of the wireless communications system 100, and each UE 115 can be stationary, or mobile, or both at different times. The UEs 115 can be devices in different forms or having different capabilities. Figure 1 Some example UEs 115 are illustrated. The UEs 115 described herein can be able to communicate with various types of devices, such as other UEs 115 or network entities 105, as described herein. Figure 1

[0033] As described herein, a node of the wireless communications system 100, which can be referred to as a network node or a wireless node, can be a network entity 105 (e.g., any of the network entities described herein), a UE 115 (e.g., any of the UEs described herein), a network controller, a device, an apparatus, a computing system, one or more components, or another suitable processing entity configured to perform any of the techniques described herein. For example, a node can be a UE 115. As another example, a node can be a network entity 105. As yet another example, a first node can be configured to communicate with a second node or a third node. In one aspect of this example, the first node can be a UE 115, the second node can be a network entity 105, and the third node can be a UE 115. In another aspect of this example, the first node can be a UE 115, the second node can be a network entity 105, and the third node can be a network entity 105. In other aspects of this example, the first node, the second node, and the third node can be different with respect to these examples. Similarly, a reference to a UE 115, a network entity 105, a device, an apparatus, a computing system, etc., can include a disclosure of the UE 115, the network entity 105, the device, the apparatus, the computing system, etc., as a node. For example, a disclosure of a UE 115 configured to receive information from a network entity 105 also discloses a first node configured to receive information from a second node.

[0034] ​In some examples, the network entities 105 can communicate with the core network 130, or with each other, or both. For example, the network entities 105 can communicate with the core network 130 via one or more backhaul communication links 120 (e.g., according to an SI, N2, N3, or other interface protocol). In some examples, the network entities 105 can communicate with each other via the backhaul communication links 120 (e.g., directly, or indirectly, e.g., via the core network 130), for example, according to an X2, Xn, or other interface protocol. In some examples, the network entities 105 can communicate with each other via the fronthaul communication links 162 (e.g., according to a fronthaul interface protocol) or the access communication links 165 (e.g., according to an access interface protocol), or any combination thereof. The backhaul communication links 120, fronthaul communication links 162, or access communication links 165 can be or include one or more wired links (e.g., cable, fiber optic), one or more wireless links (e.g., radio, wireless optical), etc., or various combinations thereof. The UEs 115 can communicate with the core network 130 via communication links 155.

[0035] One or more of the network entities 105 described herein can include or can 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 NodeB, an eNodeB (eNB), a next generation NodeB, or a gigabit NodeB (any of which can be referred to as a gNB), a 5G NB, a next generation eNB (ng-eNB), a Home NodeB, a Home eNodeB, or other suitable terminology). In some examples, the network entities 105 (e.g., base stations 140) can implement an aggregated (e.g., monolithic, standalone) base station architecture that can be configured to utilize protocol stacks that are physically or logically integrated within a single network entity 105 (e.g., a single RAN node such as a base station 140).

[0036] In some examples, the network entity 105 can be implemented in a disaggregated architecture (e.g., a disaggregated base station architecture, a disaggregated RAN architecture) that can be configured to utilize a protocol stack distributed physically or logically among two or more network entities 105, such as an integrated access backhaul (IAB) network, an open RAN (O-RAN) (e.g., a network configuration sponsored by the O-RAN Alliance), or a virtualized RAN (vRAN) (e.g., a cloud RAN (C-RAN)). For example, the network entity 105 can include one or more of 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 can also be referred to as a radio head, an intelligent radio head, a remote radio head (RRH), a remote radio unit (RRU), or a transmission reception point (TRP). One or more components of the network entity 105 in the disaggregated RAN architecture can be co-located, or one or more components of the network entity 105 can be located in distributed locations (e.g., separate physical locations). In some examples, one or more network entities 105 of the disaggregated RAN architecture can be implemented as virtual units (e.g., a virtual CU (VCU), a virtual DU (VDU), a virtual RU (VRU)).

[0037] The functional split between the CU 160, the DU 165, and the RU 170 is flexible and can support different functionality depending on which functions (e.g., network layer functions, protocol layer functions, baseband functions, RF functions, and any combination thereof) are performed at the CU 160, the DU 165, or the RU 170. For example, a functional split of a protocol stack can be employed between the CU 160 and the DU 165, such that the CU 160 can support one or more layers of the protocol stack, and the DU 165 can support one or more different layers of the protocol stack. In some examples, the 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 can connect to one or more DUs 165 or RUs 170, and the one or more DUs 165 or RUs 170 can host lower protocol layers, such as layer 1 (LI) (e.g., physical (PHY) layer) or L2 (e.g., radio link control (RLC) layer, medium access control (MAC) layer) functionality and signaling, and can each be at least partially controlled by the CU 160. Additionally or alternatively, a functional split of a protocol stack can be employed between the DU 165 and the RU 170, such that the DU 165 can support one or more layers of the protocol stack, and the RU 170 can support one or more different layers of the protocol stack. The DU 165 can support one or more different cells (e.g., via one or more RUs 170). In some cases, the functional split between the CU 160 and the DU 165 or between the DU 165 and the RU 170 can be within a protocol layer (e.g., some functions of a protocol layer can be performed by one of the CU 160, the DU 165, or the RU 170, while other functions of that protocol layer are performed by a different one of the CU 160, the DU 165, or the RU 170). The CU 160 can be further split in functionality into a CU control plane (CU-CP) function and a CU user plane (CU-UP) function. The CU 160 can connect to one or more DUs 165 via a backhaul communication link 162 (e.g., Fl, Fl-c, Fl-u), and the DU 165 can connect to one or more RUs 170 via a front-haul communication link 168 (e.g., open front-haul (FH) interface). In some examples, the backhaul communication link 162 or the front-haul communication link 168 can be implemented in accordance with an interface (e.g., channel) between layers of a protocol stack supported by the respective network entities 105 that communicate via such communication links.

[0038] In a wireless communication system (e.g., wireless communication system 100), infrastructure and spectrum resources for radio access can support wireless backhaul link capabilities to supplement wired backhaul connections to provide an IAB network architecture (e.g., to core network 130). In some cases, in an IAB network, one or more network entities 105 (e.g., IAB nodes 104) can be partially controlled by one another. One or more IAB nodes 104 can be referred to as a donor entity or IAB donor. One or more DUs 165 or one or more RUs 170 can be partially controlled 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) can 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). An IAB node 104 can include an IAB mobile terminal (IAB-MT) controlled (e.g., scheduled) by a coupled DU 165 of an IAB donor. An IAB-MT can include a separate set of antennas for relaying communications with UEs 115 or can share the same antennas (e.g., of a RU 170) of the IAB node 104 for accessing via the DU 165 of the IAB node 104 (e.g., referred to as a virtual IAB-MT (vIAB-MT)). In some examples, an IAB node 104 can include a DU 165 that supports a communication link with an additional entity (e.g., IAB node 104, UE 115) within a relay chain or configuration (e.g., downstream) of an access network. In such cases, one or more components of the disaggregated RAN architecture (e.g., one or more IAB nodes 104 or components of an IAB node 104) can be configured to operate according to the techniques described herein.

[0039] In cases where the techniques described herein apply to a disaggregated RAN architecture, one or more components of the disaggregated RAN architecture can be configured to support transmitting sidelink feedback messages according to a sidelink slot structure as described herein. For example, some operations described as being performed by a UE 115 or network entity 105 (e.g., base station 140) can 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).

[0040] A UE 115 can include or can be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable terminology, where the “device” can also be referred to as a unit, a station, a terminal, or a client, among other examples. A UE 115 can also include or can 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, a UE 115 can include or 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 communications (MTC) device, among other examples, which can be implemented in various objects such as appliances or vehicles, among other examples.

[0041] The UEs 115 described herein can be able to communicate with various types of devices, such as other UEs 115 that can sometimes act as relays or network entities 105 and the network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, among other examples, as shown in Figure 1

[0042] The UEs 115 and the network entities 105 can wirelessly communicate with each other using resources associated with one or more carriers via one or more communication links 125 (e.g., access links). The term “carrier” can refer to a set of RF spectrum resources with a defined physical layer structure for supporting communication links 125. For example, a carrier used for a communication link 125 can include a portion of an RF spectrum band (e.g., a bandwidth part (BWP)) operating 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 can carry acquisition signaling (e.g., synchronization signals, system information), control signaling coordinating carrier operation, user data, or other signaling. The wireless communications system 100 can support communication with UEs 115 using carrier aggregation or multi-carrier operation. According to a carrier aggregation configuration, a UE 115 can be configured with multiple downlink component carriers and one or more uplink component carriers. Carrier aggregation can be used with both frequency division duplexing (FDD) and time division duplexing (TDD) component carriers. Communications between a network entity 105 and other devices can refer to communications between these devices and any part of the network entity 105 (e.g., an entity, sub-entity). For example, the terms “transmit,” “receive,” or “communicate” can refer to any part of a network entity 105 (e.g., a base station 140, a CU 160, a DU 165, a RU 170) communicating with another device (e.g., directly or via one or more other network entities 105).

[0043] ​In some examples, such as in carrier aggregation configurations, a carrier can also have acquisition signaling or control signaling that coordinates operations of other carriers. A carrier can be associated with a frequency channel (e.g., an evolved universal mobile telecommunications system terrestrial radio access (E-UTRA) absolute radio frequency channel number (EARFCN)) and can be identified according to a channel raster for discovery by UEs 115. A carrier can be operated in a standalone mode where initial acquisition and connection can be performed by a UE 115 via the carrier, or the carrier can be operated in a non-standalone mode where a different carrier (e.g., of a same or different radio access technology) is used for anchoring connection.

[0044] The communication links 125 shown in wireless communication system 100 can include downlink transmissions from network entities 105 to UEs 115, uplink transmissions from UEs 115 to network entities 105, or both, as well as other transmissions. A carrier can carry downlink or uplink communications (e.g., in an FDD mode) or can be configured to carry downlink and uplink communications (e.g., in a TDD mode).

[0045] A carrier can be associated with a particular bandwidth of the RF spectrum, and in some examples the carrier bandwidth can be referred to as a “system bandwidth” of the carrier or wireless communication system 100. For example, the carrier bandwidth can be one of a set of bandwidths for carriers of a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 megahertz (MHz)). Devices of wireless communication system 100 (e.g., network entities 105, UEs 115, or both) can have hardware configurations that support communications using a particular carrier bandwidth or can be configurable to support communications using one of a set of carrier bandwidths. In some examples, wireless communication system 100 can include network entities 105 or UEs 115 that support concurrent communications using carriers associated with multiple carrier bandwidths. In some examples, each served UE 115 can be configured for operating over portions (e.g., sub-bands, BWPs) or all of a carrier bandwidth.

[0046] Signal waveforms transmitted over a carrier can 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 employing MCM techniques, a resource element can refer to a resource comprising a symbol period (e.g., the duration of one modulation symbol) and one subcarrier, in which case the symbol period and subcarrier spacing (SCS) can be inversely related. The number of bits carried by each resource element can depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both), such that a relative higher number of resource elements (e.g., in a transmission duration) and a relative higher modulation scheme order can correspond to a relative higher communication rate. A wireless communications resource can refer to a combination of a RF spectrum resource, a time resource, and a spatial resource (e.g., spatial layers or beams), and the use of multiple spatial resources can increase the data rate or data

[0047] One or more numerologies can be supported for a carrier, and a numerology can include a SCS ) and a cyclic prefix. A carrier can be partitioned into one or more BWPs having the same or different numerologies. In some examples, a UE 115 can be configured with multiple BWPs. In some examples, a single BWP of a carrier can be active at a given time, and communications of the UE 115 can be constrained to one or more active BWPs.

[0048] Time intervals for the network entity 105 or the UE 115 can be expressed in multiples of a basic time unit, which may, for example, refer to a sampling period of seconds, where may represent a supported SCS, and may represent a supported discrete Fourier transform (DFT) size. Time intervals of a communications resource can be organized as radio frames, each

[0049] Each frame can include a plurality of consecutive numbered subframes or slots, and each subframe or slot can have the same duration. In some examples, a frame can be divided (e.g., in the time domain) into subframes, and each subframe can be further divided into a number of slots. Alternatively, each frame can include a variable number of slots, and the number of slots can depend on the SCS. Each slot can include a number of symbol periods (e.g., depending on the length of the cyclic prefix prepended to each symbol period). In some wireless communications systems 100, slots can be further divided into multiple mini-slots, each associated with one or more symbols. Excluding the cyclic prefix, each symbol period can be associated with one or more (e.g., A symbol period can be associated with one or more subcarriers. The duration of a symbol period can depend on the SCS or the operating band.

[0050] A subframe, a slot, a mini-slot, or a symbol can be the smallest scheduling unit of the wireless communications system 100 (e.g., in the time domain) and can 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) can be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communications system 100 can be dynamically selected (e.g., in a burst of shortened TTIs (sTTIs)).

[0051] According to various techniques, physical channels can be multiplexed for communication using carriers. Physical control channels and physical data channels can be multiplexed via a downlink carrier, for example, using one or more of time division multiplexing (TDM) techniques, frequency division multiplexing (FDM) techniques, or hybrid TDM-FDM techniques. A control region (e.g., a control resource set (CORESET)) of a physical control channel can be defined by a set of symbol periods and can extend across the system bandwidth or a subset thereof of a carrier. One or more control regions (e.g., CORESETs) can be configured for a set of UEs 115. For example, one or more of the UEs 115 can monitor or search control regions for control information according to one or more search space sets, and each search space set can include one or more control channel candidates arranged in an order of increasing aggregation level from one or more of the UEs 115. An aggregation level of a control channel candidate can refer to a quantity of control channel resources (e.g., control channel elements (CCEs)) associated with encoded information for a control information format having a given payload size. A search space set can include common search space sets configured for transmission of control information to multiple UEs 115, and UE-specific search space sets for transmission of control information to a specific UE 115.

[0052] In some examples, network entities 105 (e.g., base stations 140, RUs 170) can be mobile and thus provide communication coverage for a moving coverage area 110. In some examples, different coverage areas 110 associated with different technologies can overlap, but different coverage areas 110 can be supported by the same network entity 105. In some other examples, overlapping coverage areas 110 associated with different technologies can be supported by different network entities 105. Wireless communications system 100 can include, for example, a heterogeneous network in which different types of network entities 105 provide coverage for various coverage areas 110 using the same or different radio access technologies.

[0053] Some UEs 115, such as MTC or IoT devices, can be low cost or low complexity devices, and can provide for automated communication between machines (e.g., via Machine-to-Machine (M2M) communication). M2M communication or MTC can refer to data communication technologies that allow devices to communicate with one another or a network entity 105 (e.g., base station 140) without human intervention. In some examples, M2M communication or MTC can include communications from devices that integrate sensors or meters to measure or acquire information and relay such information to a central server or application program that makes use of the information or presents the information to humans in an intuitive manner. Some UEs 115 can be designed to collect information or enable automated behavior of machines or other devices. Examples of applications for MTC devices include smart metering, inventory monitoring, water level monitoring, equipment monitoring, healthcare monitoring, wildlife monitoring, weather and geological event monitoring, fleet management, remote security sensing, physical access control, and transaction-based business charging.

[0054] The wireless communications system 100 can be configured to support ultra-reliable communications or low-latency communications, or various combinations thereof. For example, the wireless communications system 100 can be configured to support ultra-reliable low-latency communications (URLLC). UEs 115 can be designed to support ultra-reliable or low-latency or critical functions. Ultra-reliable communications can include private communication or group communication and can be supported by one or more services such as push-to-talk, video, or data. Support of ultra-reliable, low-latency functions can include prioritization of services, and such services can be used for public safety or general commercial applications. The terms “ultra-reliable,” “low-latency,” and “ultra-reliable low-latency” can be used interchangeably herein.

[0055] In some examples, UEs 115 can be configured to support direct communications with other UEs 115 via 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 is performing D2D communications can be within the coverage area 110 of a network entity 105 (e.g., base station 140, RU 170) that can support such D2D communications configured by (e.g., scheduled by) the network entity 105. In some examples, one or more UEs 115 in such a group can be outside the coverage area 110 of a network entity 105 or can otherwise be unable to, or configured not to, receive from the network entity 105. In some examples, a group of UEs 115 communicating via D2D communications can support a one-to-many (1:M) system, where one UE 115 transmits to many other UEs 115 in the group. In some examples, a network entity 105 can facilitate scheduling of resources for D2D communications. In some other examples, D2D communications can be carried out between UEs 115 without involvement by network entity 105.

[0056] In some systems, D2D communication link 135 can be an example of a communication channel, such as a sidelink communication channel, between vehicles (e.g., UEs 115). In some examples, vehicles can communicate using vehicle-to-everything (V2X) communications, vehicle-to-vehicle (V2V) communications, or some combination of these. A vehicle can signal information about traffic conditions, signal scheduling, weather, safety, emergencies, or any other information relevant to V2X systems. In some examples, a vehicle in a V2X system can communicate with roadside infrastructure, such as roadside units, or with the network via one or more network nodes (e.g., network entities 105, base stations 140, RUs 170) using vehicle-to-network (V2N) communications, or both.

[0057] The core network 130 can provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 can be an evolved packet core (EPC) or 5G core (5GC), which can include at least one control plane entity that can manage access and mobility (e.g., a mobility management entity (MME), an access and mobility management function (AMF)) and at least one user plane entity that can route packets or interconnect to external networks (e.g., a serving gateway (S-GW), a packet data network (PDN) gateway (P-GW), or a user plane function (UPF)). The control plane entity can manage non-access stratum (NAS) functions such as mobility, authentication, and bearer management for UEs 115 served by network entities 105 (e.g., base stations 140) associated with the core network 130. User IP packets can be transferred through the user plane entity, which can provide IP address allocation as well as other functions. The user plane entity can be connected to the IP services 150 of the one or more network operators. The IP services 150 can include access to the Internet, Intranet, an IP multimedia subsystem (IMS), or a packet-switched streaming service.

[0058] The wireless communications system 100 can operate using one or more frequency bands, in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). Generally, the region from 300 MHz to 3 GHz is known as the ultra-high frequency (UHF) region or decimeter band, since the wavelengths range from approximately one decimeter to one meter in length. UHF waves can be blocked or redirected by buildings and environmental features, but the waves can penetrate structures sufficiently for a macro cell to provide service to UEs 115 located indoors. The use of UHF frequencies, however, can support relatively narrow antenna beams, and the use of such narrow antenna beams can increase the capacity of the wireless communications system 100.

[0059] The wireless communications system 100 can utilize both licensed and unlicensed RF spectrum bands. For example, the wireless communications system 100 can employ License Assisted Access (LAA), LTE-Unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed frequency spectrum band such as the 5 GHz industrial, scientific and medical (ISM) band. When operating in unlicensed frequency spectrum bands, access points 105 and UEs 115 such as network entities 105 and UE 115 can employ carrier sensing for collision detection and avoidance. In some examples, operations in unlicensed frequency spectrum bands can be based on a carrier aggregation configuration with a component carrier operating in a licensed frequency spectrum band (e.g., LAA). Operations using unlicensed spectrum can include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, among other examples.

[0060] The network entity 105 (e.g., base station 140, RU 170) or UE 115 can be equipped with multiple antennas, which can be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communication, or beamforming. The antennas of a network entity 105 or UE 115 can be located in one or more antenna arrays or antenna panels, which can support MIMO operations or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays can be co-located at an antenna assembly, such as an antenna tower. In some examples, antennas or antenna arrays associated with a network entity 105 can be located at different geographic locations. A network entity 105 can include an antenna array with a set of multiple rows and multiple columns of antenna ports that the network entity 105 can use to support beamforming of transmissions to or from a UE 115. Similarly, a UE 115 can include one or more antenna arrays, which can support various MIMO or beamforming operations. Additionally or alternatively, an antenna panel can support RF beamforming for signals transmitted via the antenna ports.

[0061] Beamforming, which can also be referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that can be used at a transmitting device or a receiving device (e.g., a network entity 105, a UE 115) to shape or steer the beam over the space. Beamforming can be achieved by combining the signals communicated by antennas of an antenna array such that signals at particular orientations experience constructive interference while others experience destructive interference. The adjustments to signals communicated by each of the antennas of the antenna array can include applying amplitude shifts, phase shifts, or both. The adjustments associated with each of the antennas of the antenna array can be defined by a beamforming weight set associated with a particular orientation (e.g., with respect to the antenna array of the transmitting device or receiving device, or with respect to some other orientation).

[0062] The wireless communications system 100 can be a packet-based network that operates according to a layered protocol stack. In the user plane, communications at the bearer or PDCP layer can be IP -based. A RLC layer can perform packet segmentation and reassembly to communicate over logical channels. The MAC layer can perform priority handling and multiplexing of logical channels into transport channels. The MAC layer can also use error detection techniques, error correction techniques, or both, to support retransmissions to improve link efficiency. In the control plane, the RRC layer can provide establishment, configuration, and maintenance of an RRC connection between a UE 115 and a network entity 105 or core network 130 supporting radio bearers for user plane data. The PHY layer can map transmission channels to physical channels.

[0063] The UEs 115 and the network entities 105 can support retransmissions of data to increase the likelihood that data is received successfully. Hybrid automatic repeat request (HARQ) feedback is a technique for increasing the likelihood that data is received correctly at a receiving device. HARQ may

[0064] The wireless communications system 100 can support a format for transmitting a sidelink feedback message for a dynamic sidelink slot structure in FR 2-2. A first UE 115 can engage in sidelink communications with a second UE 115 using a sidelink slot structure. The sidelink slot structure can include a set of periodic AGC TTIs (e.g., slots, symbols) that can be common across wireless networks. The first UE 115 can monitor for a sidelink message (e.g., PSSCH, PSCCH) during a monitoring interval associated with an AGC TTI in the slot sidelink slot format. For example, the UE 115 can monitor for the sidelink message in one or more slots or symbols immediately after the AGC TTI. In some examples, the UE 115 can transmit a sidelink feedback message (e.g., PSFCH), where a format of the sidelink feedback message can be associated with an uplink control channel format and the sidelink slot structure. For example, if the format of the sidelink feedback message is associated with PUCCH format 0, the UE 115 can transmit the sidelink feedback message on a set of RBs of the sidelink slot structure. Alternatively, if the format of the sidelink feedback message is associated with PUCCH format 2, the UE 115 can transmit the sidelink feedback message on more than two symbols of the sidelink slot structure.

[0065] Figure 2Examples of a wireless communication system 200 supporting the transmission of sidelink feedback messages according to a sidelink time slot structure, according to one or more aspects of this disclosure, are shown. In some examples, the wireless communication system 200 may implement aspects of the wireless communication system 100, or may be implemented by aspects of the wireless communication system 100. For example, the wireless communication system 200 may include UE 115-a and UE 115-b, which may be examples of UE 115 as described herein. UE 115 may support a format for transmitting sidelink feedback messages (e.g., PSFCH) according to the dynamic sidelink time slot structure in FR 2–2.

[0066] The wireless communication system 200 can support communication between UEs 115 via a communication link 205 (e.g., a side link), which may be referenced herein. Figure 1 An example of the described communication link 125. UE 115-a may participate in sidelink communication with UE 115-b (e.g., via communication link 205) according to the sidelink time slot structure 210 used in the wireless communication system 200 (e.g., a wireless network). The sidelink time slot structure 210 may include a set of AGC candidate TTIs 215 that are common across the wireless communication system 200. Furthermore, the sidelink time slot structure 210 may include a number of data TTIs 225, PSFCHTTIs 235, and gaps 240 (e.g., gap symbols). For example, the sidelink time slot structure 210 may include AGC candidate TTIs 215-a, AGC candidate TTIs 215-b, and AGC candidate TTIs 215-c, which may be examples of AGC candidate symbols or time slots. Figure 2 In the example, AGC candidate TTI 215 may have a time period of four slots. Furthermore, data TTI 225 may include PSSCH slots or symbols, PSCCH slots or symbols, or combinations thereof, and sidelink slot structure 210 may include gaps 240-a and 240-b, which may include at least four symbols. The additional gaps 240 in sidelink slot structure 210 may be used to convey other types of data, or may be empty.

[0067] In some examples, the number of AGC candidate TTIs 215 and the number and location of data TTIs 225 in the sidelink slot structure 210 can be based on or associated with different numerologies. For example, for a 120 kHz SCS, the sidelink slot structure 210 can support a four-symbol AGC candidate TTI 215, a data TTI 225 (e.g., PSSCH TTI, PSCCH TTI), and a one-symbol gap 240 in the last PSSCH slot. Further, the sidelink slot structure 210 can support a four-symbol AGC candidate TTI 215, a half-symbol PSFCH TTI 235 (i.e., a half-symbol PSFCH symbol), and one or more gaps 240 (e.g., one or more gap symbols). In some other examples, for a 480 kHz SCS, the sidelink slot structure 210 can support one AGC candidate TTI 215 (e.g., one AGC candidate slot), multiple data TTIs 225, and at least four-symbol gaps 240 (e.g., transmit / receive gaps) in the last PSSCH slot. Further, the sidelink slot structure can support one AGC candidate TTI 215 (e.g., one AGC candidate slot) followed by a PSFCH TTI 235 (e.g., a PSFCH slot) and at least four-symbol gaps 240.

[0068] In FR2-2 Uu communications (e.g., uplink and downlink communications between a UE 115 and a network entity 105), PUCCH formats 0, 1, 3, and 4 can be enhanced to occupy a configurable number of RBs so that the UE 115 can transmit the PUCCH at maximum power under an effective isotropic radiated power (EIRP) limit. However, for sidelink communications, current techniques can lack support for DFT-precoded PUCCH formats (e.g., PUCCH formats 3 and 4). Further, a UE 115 can support a multi-bit format (e.g., PUCCH format 2) to carry a HARQ codebook, however PUCCH format 2 can be limited to occupying up to two symbols, thereby making PSFCH slots inefficient in the sidelink slot structure 210. That is, a PSFCH based on PUCCH format 2 can not be allowed to span more than two symbols. Further, a PSFCH based on PUCCH format 0 can not be allowed to occupy more than one RB, which can result in coverage issues under an EIRP limit. Thus, the wireless communications system 200 can support enhancements to PSFCH waveforms for sidelink communications in FR2-2 to support full transmit power of a UE 115 and fit the sidelink slot structure 210, which can include multiple AGC symbols or slots (AGC candidate TTIs 215).

[0069] According to the sidelink slot structure 210, the UE 115 can transmit a PSSCH, PSCCH, or PSFCH (including AGC symbols or slots) starting from the AGC candidate TTI 215. That is, a sidelink message or sidelink feedback message transmission can occur on one or more TTIs following the AGC candidate TTI 215. For example, if the AGC candidate TTI 215 has a four-slot period, the AGC candidate TTI 215-a can be followed by a data TTI 225-a (e.g., a PSCCH slot, a PSSCH slot), a data TTI 225-b (e.g., a PSSCH slot), and a data TTI 225-c (e.g., a PSSCH half-slot), and a gap 240-a (e.g., a half-slot gap). The gap 240-a can be followed by the AGC candidate TTI 215-b, which can be followed by symbols for additional data transmission, and so on. If the UE 115 has additional data to transmit (e.g., more than three slots of data) prior to the AGC candidate TTI 215-b, the UE 115 can override the AGC candidate TTI 215-b and instead transmit a PSSCH or PSCCH in that TTI.

[0070] In some examples, the UE 115-a can monitor for a sidelink message 220 (e.g., a PSSCH, PSCCH) during a monitoring interval associated with the AGC candidate TTI 215 in the sidelink slot structure 210. For example, the UE 115-a can monitor for the sidelink message 220 during the data TTI 225-a, the data TTI 225-b, the data TTI 225-c, or any other data TTIs 225 following the AGC candidate TTI 215-a in the sidelink slot structure 210. According to monitoring for the sidelink message 220, the UE 115-a can transmit a sidelink feedback message 230 (e.g., an ACK / NACK PSFCH). In some examples, a format of the sidelink feedback message 230 can be associated with a PUCCH format 0, in which case the UE 115-a can transmit the sidelink feedback message 230 on a set of multiple RBs of the sidelink slot structure 210. The set of multiple RBs can include a preconfigured number of RBs (e.g., 12 RBs) that can be associated with a PUCCH format 0. M RB Alternatively, the format of the sidelink feedback message 230 can be associated with a PUCCH format 2, in which case the UE 115-a can transmit the sidelink feedback message 230 on more than two symbols of the sidelink slot structure. In this way, the UE 115 can support PUCCH 0 and PUCCH 2 based PSFCH transmissions according to the sidelink slot structure 210.

[0071] In some examples of FR2-2 Uu communications, PUCCH Format 0 can be configured to occupy up to 16 RBs. For sidelink communications as described herein, the sidelink slot structure 210 can allow for PUCCH Format 0 based PSFCH to occupy a preconfigurable number of RBs using repetition or long base sequences (e.g., M RB For example, to enable PSFCH transmissions to occupy more than one RB, the UE 115-a can repeat the PSFCH TTIs 235 multiple times in the sidelink slot structure 210 and apply a cyclic shift ramping to reduce the peak-to-average power ratio (PAPR). To apply the cyclic shift ramping, the UE 115-a can introduce different cyclic shift offsets for different RBs in the PSFCH resources (e.g., the PSFCH TTIs 235). In this way, the UE 115-a can transmit the sidelink feedback messages 230 over a set of multiple RBs through transmission of a set of multiple repetitions of the sidelink feedback messages 230, and the UE 115-a can apply a cyclic shift offset to each respective RB of the set of multiple RBs.

[0072] Alternatively, to allow PUCCH Format 0 based PSFCH to occupy a preconfigurable number of RBs (e.g., M RB ), the UE 115-a can increase the length of the base sequence associated with the PSFCH, for example, from length 12 to length 12 M RB In some examples, the length of the type of sequence can be associated with or based on the length of the transmitted sequence. For example, if length 12 M RB ≥ 36, the sequence can be from a Zadoff-Chu sequence. If length 12 M RB < 36, the sequence can be from a computer generated sequence. In this way, the UE 115-a can transmit the sidelink feedback messages 230 over a set of multiple RBs through transmission of a sequence (e.g., a Zadoff-Chu sequence, a computer generated sequence) whose length is associated with (or based on) the number of the set of multiple RBs.

[0073] In some cases, as the number of RBs occupied by the PUCCH Format 0 based PSFCH increases, the multiplexing capacity of the UE 115-a for groupcast Option 2 can be limited. That is, in sidelink communications, if the number of RBs increases such that each sidelink feedback message 230 (e.g., each ACK / NACK) occupies one RB, the capacity of the PUCCH Format 0 based PSFCH (e.g., the channel carrying the ACK / NACKs) can decrease. Thus, to increase the multiplexing capacity of the UE 115-a for groupcast Option 2, the UE 115-a can increase the number of RBs occupied by the PUCCH Format 0 based PSFCH. M RBimprove multiplexing capacity of UE 115-a when greater than some preconfigured threshold, UE 115-a can repeat the PSFCH for PUCCH format 0 based PSFCH in multiple symbols in the time domain M RB consecutive RBs and apply a time domain orthogonal cover code (TD-OCC). In some examples, different UEs 115 can apply different TD-OCC sequences for different symbols to enable more UE multiplexing. Thus, UE 115-a can transmit the sidelink feedback message 230 over the set of multiple RBs and over the multiple symbols (e.g., PSFCH TTIs 235) of the sidelink slot structure 210 by one or more repetitions of the sidelink feedback message 230. Further, UE 115-a can apply a TD-OCC to the transmission of the one or more repetitions of the sidelink feedback message 230 depending on the number of the set of multiple RBs (e.g., M RB ) exceeding a threshold. In accordance with applying the TD-OCC, UE 115-a can multiplex the sidelink feedback message 230 with additional sidelink feedback messages.

[0074] A sidelink transmitter (e.g., UE 115-a or UE 115-b) can indicate the number of RBs for the transmission of one or more repetitions of the sidelink feedback message 230. In some cases, UE 115-a can receive a RRC configuration message to transmit the PSFCH repetitions over the set of multiple RBs. In such cases, UE 115-a can exchange messages with UE 115-b and negotiate the configuration. Alternatively, a network entity 105 can configure a particular number of RBs and PSFCH symbols for sidelink UEs 115 (including UE 115-a and UE 115-b) in the wireless communications system 200 based on different use cases.

[0075] In some sidelink scenarios, because a UE 115 can be configured a contiguous number of RBs for one ACK / NACK message, the UE 115 can configure the number of RBs for PSFCH transmission and the starting RB of PSFCH per resource pool. For example, UE 115-a can receive a control message (e.g., a RRC configuration message) prior to the transmission of the sidelink feedback message 230 over the set of multiple RBs. The control message can indicate the number of the set of multiple RBs and a starting RB in the set of multiple RBs over which UE 115-a can start the transmission of the sidelink feedback message 230 per resource pool. In some examples, the control message (e.g., a RRC configuration message) can indicate a frequency grid corresponding to the set of multiple RBs for PSFCH transmission. M RB

[0076] ​For additional or alternative locations, UE 115 can use bitmaps. sl-PSFCH-RB-set This indicates a single RBPSFCH resource within a resource pool. For example, a set of multiple RBs can be indicated in a bitmap. M RB A series of consecutive RBs, where RBs (e.g., physical RBs (PRBs)) can be grouped into a PSFCH resource starting with the lowest RB in the resource pool. In some cases, a bit in the bitmap can indicate the PSFCH transmission. M RB One of the RBs, or a reusable bitmap in UE 115. sl-PSFCH-RB-set And allow M RB A series of consecutive bits are set for M RB Each RB. Thus, UE 115-a can receive a bitmap indicating a set of multiple RBs (e.g., via a control message), where each bit of the bitmap indicates a corresponding RB in the set of multiple RBs.

[0077] In Uu communication, PUCCH format 2 can be configured to occupy up to 16 RBs, which adequately addresses power constraints. However, PUCCH format 2 can occupy one or two symbols in the time domain, which can make the use of PUCCH format 2-based PSFCH slots in the sidelink slot structure 210 inefficient. For example, the PSFCH may need to carry a large HARQ codebook for timeout slots (e.g., multiple consecutive slots on which feedback can be sent), or the PSFCH slots may need to carry ACK / NACK messages from a large number of receivers (e.g., multicast option 2 receivers), potentially limiting the PSFCH multiplexing capacity of UE 115.

[0078] To address these limitations, the sidelink feedback message 230 can be a multi-symbol PUCCH format 2-PSFCH, and UE 115-a can transmit the sidelink feedback message 230 on more than two symbols of the sidelink time slot structure 210. The number of more than two symbols can be pre-configured, and UE 115-a can map symbols (if configured after FDD-OCC extension) to a pre-configured number of RBs and symbols (e.g., first in the frequency domain and later in the time domain). That is, UE 115-a can transmit the sidelink feedback message 230 on more than two symbols by applying a mapping of more than two symbols to a certain number of RBs in the sidelink time slot structure 210. Furthermore, UE 115-a can apply a frequency domain orthogonal coverage code (FD-OCC) to the transmission of the sidelink feedback message 230 on more than two symbols of the sidelink time slot structure. (References: This document refers to...) Figure 3Additional techniques for increasing multiplexing capacity of a UE 115-a according to PUCCH format 2 based PSFCH are described.

[0079] Figure 3 An example of a sidelink slot structure 300 that supports transmitting sidelink feedback messages according to sidelink slot structures is shown, in accordance with one or more aspects of the present disclosure. In some examples, the sidelink slot structure 300 can implement aspects of, or can be implemented by aspects of, the wireless communications systems 100 and 200. For example, the sidelink slot structure 300 can support PUCCH format 2 based PSFCH, which can increase multiplexing capacity of UEs 115.

[0080] As described herein with reference to Figure 2 Two or more UEs 115 can engage in sidelink communications according to a sidelink slot structure used in a wireless network, such as the sidelink slot structure 300, as described herein with reference to FIG. 3. The sidelink slot structure 300 can include a set of periodic AGC candidate TTIs 305 (e.g., AGC slots or symbols) that can be common across the wireless network. For example, the sidelink slot structure 300 can include an AGC candidate TTI 305, which can include four or more symbols. The sidelink slot structure 300 can additionally include data TTIs (e.g., for transmitting PSSCH and PSCCH), PSFCH TTIs 310, one or more gap symbols 315, or combinations thereof. A UE 115 can monitor for a sidelink feedback message (e.g., PSCCH, PSSCH) in a monitoring interval associated with an AGC candidate TTI 305 of the sidelink slot structure 300.

[0081] According to the monitoring, the UE 115 can transmit a sidelink feedback message (e.g., PSFCH). In Figure 3 In examples, a format of the sidelink feedback message can be associated with PUCCH format 2, and the UE 115 can transmit the sidelink feedback message over more than two symbols of the sidelink slot structure 300. The symbols can be represented as PSFCH TTIs 310.

[0082] In some cases, the UE 115 can repeat a first number of symbols (e.g., X) of the PUCCH format 2 based PSFCH a second number of times (e.g., Y) in the time domain, and apply a TD-OCC 320. That is, the UE 115 can transmit the sidelink feedback message over more than two symbols (e.g., PSFCH TTIs 310 after the AGC candidate TTI 305) by az per number of symbols. Further, the UE 115 can apply the TD-OCC 320 to the repetitions of the sidelink feedback message. In Figure 3In the example of sidelink slot structure 300, UE 115 can repeat two-symbol PSFCH TTIs 310 four times (e.g., X = 2, Y = 4), including two-symbol PSFCH TTI 310-a, two-symbol PSFCH TTI 310-b, two-symbol PSFCH TTI 310-c, and two-symbol PSFCH TTI 310-d. Thus, sidelink slot structure 300 can include eight symbols over which UE 115 can transmit a sidelink feedback message. Further, UE 115 can apply four TD-OCCs 320, which can increase the occupation of PSFCH TTIs 310 by a factor of four, thereby improving the efficiency of the PSFCH TTIs 310. For example, TD-OCCs 320 can include the sequences [+1 +1 +1 +1], [+1 -1 +1 -1], [+1 +1 -1 -1], and [+1 -1 -1 +1].

[0083] In some cases, the number of CDMed PSFCHs that UE 115 can be can be the order of FD-OCCs and the order of TD-OCCs 320 applied to the repetitions of the sidelink feedback message. That is, UE 115 can multiplex repetitions of the sidelink feedback message according to CDM, where the CDM is according to the order of FD-OCCs applied to the repetitions of the sidelink feedback message and the order of TD-OCCs 320 applied to the repetitions of the sidelink feedback message on PSFCH TTIs 310. For example, if UE 115 applies TD-OCCs 320 and FD-OCC-4 (e.g., TD-OCC and FDD-OCC are about four) to two-symbol PSFCH TTIs 310 and repeats two-symbol PSFCH TTIs 310 four times, then sidelink slot structure 300 can support up to 16 UEs multiplexed, and the sidelink feedback message can occupy eight symbols in the PSFCH slot.

[0084] Figure 4An example of a process flow 400 that supports transmitting sidelink feedback messages according to a sidelink slot structure is shown, in accordance with one or more aspects of the present disclosure. Process flow 400 can implement, or be implemented by, aspects of wireless communications systems 100 and 200 and sidelink slot structure 300. For example, process flow 400 can illustrate operations between UE 115-c and UE 115-d, which can be examples of the corresponding devices described herein. In the following description of process flow 400, operations between UE 115-c and UE 115-d can be transmitted in a different order than the example order shown, or the operations performed by UE 115-c and UE 115-d can be performed at different times or in different orders. Some operations can also be left out of process flow 400, and other operations can be added to process flow 400.

[0085] At 405, UE 115-c can engage in sidelink communications with UE 115-d according to a sidelink slot structure used in a wireless network, where the sidelink slot structure includes a set of periodic AGC candidate TTIs (e.g., slots, symbols) that are common across the wireless network. The sidelink slot structure can be configured such that resources (e.g., slots, symbols, TTIs) for sidelink message transmissions and for sidelink feedback message transmissions can be after the AGC candidate TTIs.

[0086] At 410, UE 115-c can monitor for a sidelink message (e.g., PSSCH, PSCCH) during a monitoring interval associated with the set of periodic AGC candidate TTIs that are common in the sidelink slot structure. For example, the monitoring interval can span one or more symbols after the AGC candidate TTIs in the set of periodic AGC candidate TTIs that are common.

[0087] At 415, UE 115-c can receive a control message (e.g., RRC message) from UE 115-d prior to the transmission of the sidelink feedback message over the set of multiple RBs, where the control message indicates, on a per-resource pool basis, a number of the set of multiple RBs and a starting RB in the set of multiple RBs over which to begin the transmission of the sidelink feedback message. In some cases, the control message can include a bitmap that indicates the set of multiple RBs, where each bit of the bitmap can indicate a corresponding RB in the set of multiple RBs.

[0088] At 420, the UE 115-c can transmit a sidelink feedback message (e.g., PSFCH) to the UE 115-d according to the monitoring, where a format of the sidelink feedback message is associated with PUCCH format 0 and the sidelink feedback message is transmitted on a set of multiple RBs of the sidelink slot structure, or where the format is associated with PUCCH format 2 and the sidelink feedback message is transmitted on more than two symbols of the sidelink slot structure. For example, if the sidelink feedback message is a PUCCH format 0-PSFCH, the UE 115-c can transmit multiple repetitions of the sidelink feedback message on the set of multiple RBs.

[0089] At 425, if the sidelink feedback message is a PUCCH format 0-PSFCH, the UE 115-c can apply TD-OCC to the transmission of one or more repetitions of the sidelink feedback message according to the number of the set of multiple RBs exceeding a threshold. In some other examples, the sidelink feedback message is a PUCCH format 2-PSFCH, the UE 115-c can apply FD-OCC to the transmission of the sidelink feedback message on more than two symbols of the sidelink slot structure or TD-FDD to the repetitions of the sidelink feedback message. In some examples, the UE 115-c can multiplex the sidelink feedback message with additional sidelink feedback messages according to applying TD-OCC, FD-OCC, or both to the sidelink feedback message.

[0090] Figure 5 A block diagram 500 of a device 505 that supports transmitting a sidelink feedback message according to a sidelink slot structure is shown, in accordance with one or more aspects of the present disclosure. The device 505 can be an example of aspects of a UE 115 as described herein. The device 505 can include a receiver 510, a transmitter 515, and a communications manager 520. The device 505, or one or more components of the device 505 (e.g., the receiver 510, the transmitter 515, and the communications manager 520), can include at least one processor that can be coupled to at least one memory to individually or collectively support or implement at least portions of the described techniques. Each of these components can communicate with one another (e.g., via one or more buses).

[0091] The receiver 510 can provide a means for receiving information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to transmitting a sidelink feedback message according to a sidelink slot structure). Information can be passed on to other components of the device 505. The receiver 510 can utilize a single antenna or a set of multiple antennas.

[0092] The transmitter 515 can provide a means for transmitting signals generated by other components of the device 505. For example, the transmitter 515 can transmit information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to transmitting sidelink feedback messages according to a sidelink slot structure). In some examples, the transmitter 515 can be collocated with the receiver 510 in a transceiver module. The transmitter 515 can utilize a single antenna or a set of multiple antennas.

[0093] The communication manager 520, the receiver 510, the transmitter 515, or various combinations thereof or various components thereof can be examples of means for performing various aspects of transmitting sidelink feedback messages according to a sidelink slot structure as described herein. For example, the communication manager 520, the receiver 510, the transmitter 515, or various combinations or components thereof can be capable of performing one or more of the functions described herein.

[0094] In some examples, the communication manager 520, the receiver 510, the transmitter 515, or various combinations or components thereof can be implemented in hardware (e.g., in communication management circuitry). The hardware can include at least one of the following: 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 microcode circuit, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof. In some examples, at least one processor and at least one memory coupled with the at least one processor can be configured to perform one or more of the functions described herein (e.g., the at least one processor executing instructions stored in the at least one memory).

[0095] Additionally or alternatively, the communication manager 520, the receiver 510, the transmitter 515, or various combinations or components thereof can be implemented in code (e.g., as communication management software or firmware) executed by at least one processor. If implemented in code executed by at least one processor, the functions of the communication manager 520, the receiver 510, the transmitter 515, or various combinations or components thereof can be performed by a general-purpose processor, a DSP, a CPU, an ASIC, an FPGA, a microcontroller, or any combination of these or other programmable logic devices, collectively or individually.

[0096] In some examples, the communication manager 520 can be configured to perform various operations (e.g., receiving, obtaining, monitoring, outputting, transmitting) using or in cooperation with the receiver 510, the transmitter 515, or both. For example, the communication manager 520 can receive information from the receiver 510, transmit information to the transmitter 515, or be integrated in combination with the receiver 510, the transmitter 515, or both, to obtain information, output information, or perform various other operations as described herein.

[0097] The communication manager 520 can support wireless communication in accordance with examples as disclosed herein. For example, the communication manager 520 can be configured to support a means for participating in sidelink communications in accordance with a sidelink slot structure used in a wireless network, where the sidelink slot structure includes a set of periodic AGC candidate TTIs that are common across the wireless network. The communication manager 520 can be configured to support a means for monitoring for a sidelink message during a monitoring interval associated with the set of periodic AGC candidate TTIs that are common in the sidelink slot structure. The communication manager 520 can be configured to support a means for transmitting a sidelink feedback message in accordance with the monitoring, where a format of the sidelink feedback message is associated with uplink control channel format 0 and the sidelink feedback message is transmitted on a set of multiple RBs of the sidelink slot structure, or where the format is associated with uplink control channel format 2 and the sidelink feedback message is transmitted on more than two symbols of the sidelink slot structure.

[0098] By including or configuring the communication manager 520 in accordance with examples as described herein, the device 505 (e.g., at least one processor of the device 505 controlling the receiver 510, the transmitter 515, the communication manager 520, or a combination thereof, or otherwise coupled to them) can support techniques for transmitting sidelink feedback messages in accordance with a sidelink slot structure that can improve multiplexing capacity, increase signaling throughput, more efficiently utilize communication resources, and improve communications between UEs.

[0099] Figure 6 A block diagram 600 of a device 605 that supports transmitting sidelink feedback messages in accordance with a sidelink slot structure is shown in accordance with one or more aspects of the present disclosure. The device 605 can be an example of aspects of a device 505 or a UE 115 as described herein. The device 605 can include a receiver 610, a transmitter 615, and a communication manager 620. The device 605, or one or more components of the device 605 (e.g., the receiver 610, the transmitter 615, and the communication manager 620), can include at least one processor coupled with at least one memory to support the described techniques. Each of these components can be in communication with one another (e.g., via one or more buses).

[0100] Receiver 610 can provide means for receiving information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to transmitting sidelink feedback messages according to a sidelink slot structure). Information can be passed on to other components of the device 605. The receiver 610 can utilize a single antenna or a set of multiple antennas.

[0101] The transmitter 615 can provide means for transmitting signals generated by other components of the device 605. For example, the transmitter 615 can transmit information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to transmitting sidelink feedback messages according to a sidelink slot structure). In some examples, the transmitter 615 can be collocated with the receiver 610 in a transceiver module. The transmitter 615 can utilize a single antenna or a set of multiple antennas.

[0102] The device 605 or its various components can be an example of means for performing various aspects of transmitting sidelink feedback messages according to a sidelink slot structure as described herein. For example, the communications manager 620 can include a sidelink component 625, a monitoring component 630, a feedback component 635, or any combination thereof. The communications manager 620 can be an example of aspects of the communications manager 520 as described herein. In some examples, the communications manager 620 or its various components can be configured to use, or otherwise employ, the receiver 610, the transmitter 615, or both, to perform various operations (e.g., receiving, obtaining, monitoring, outputting, transmitting). For example, the communications manager 620 can receive information from the receiver 610, transmit information to the transmitter 615, or integrate with the receiver 610, the transmitter 615, or both, to obtain information, output information, or perform various other operations as described herein.

[0103] The communications manager 620 can support wireless communication in accordance with examples as disclosed herein. The sidelink component 625 can enable, be configured as, or be operable to support means for participating in sidelink communications in accordance with a sidelink slot structure used in a wireless network, where the sidelink slot structure includes a set of periodic AGC candidate TTIs that are common across the wireless network. The monitoring component 630 can enable, be configured as, or be operable to support means for monitoring for a sidelink message during a monitoring interval associated with the set of periodic AGC candidate TTIs that are common in the sidelink slot structure. The feedback component 635 can enable, be configured as, or be operable to support means for transmitting a sidelink feedback message in accordance with the monitoring, where a format of the sidelink feedback message is associated with uplink control channel format 0 and the sidelink feedback message is transmitted on a set of multiple RBs of the sidelink slot structure, or where the format is associated with uplink control channel format 2 and the sidelink feedback message is transmitted on more than two symbols of the sidelink slot structure.

[0104] Figure 7 A block diagram 700 illustrating a communications manager 720 that supports transmitting sidelink feedback messages according to sidelink slot structures in accordance with one or more aspects of the present disclosure is shown. The communications manager 720 can be an example of aspects of the communications manager 520, the communications manager 620, or both as described herein. The communications manager 720, or various components thereof, can be an example of means for performing various aspects of transmitting sidelink feedback messages according to sidelink slot structures as described herein. For example, the communications manager 720 can include a sidelink component 725, a monitoring component 730, a feedback component 735, a TD-OCC component 740, a control message component 745, an FD-OCC component 750, a cyclic shift component 755, a multiplexing component 760, a bitmap component 765, or any combination thereof. Each of these components, or the components or subcomponents thereof, can be in communication with one another (for example, via one or more buses).

[0105] The communications manager 720 can support wireless communications in accordance with examples as disclosed herein. The sidelink component 725 can enable, be configured as, or be able to operate as a means for participating in sidelink communications in accordance with a sidelink slot structure used in a wireless network, where the sidelink slot structure includes a set of periodic AGC candidate TTIs that are common across the wireless network. The monitoring component 730 can enable, be configured as, or be able to operate as a means for monitoring for sidelink messages during a monitoring interval associated with the set of periodic AGC candidate TTIs that are common in the sidelink slot structure. The feedback component 735 can enable, be configured as, or be able to operate as a means for transmitting a sidelink feedback message in accordance with the monitoring, where a format of the sidelink feedback message is associated with uplink control channel format 0 and the sidelink feedback message is transmitted on a set of multiple RBs of the sidelink slot structure, or where the format is associated with uplink control channel format 2 and the sidelink feedback message is transmitted on more than two symbols of the sidelink slot structure.

[0106] In some examples, and to support transmitting the sidelink feedback message, the feedback component 735 can enable, be configured as, or be able to operate as a means for transmitting the sidelink feedback message on the set of multiple RBs through transmission of a set of multiple repetitions of the sidelink feedback message.

[0107] In some examples, and to support transmitting the sidelink feedback message on the set of multiple RBs, the cyclic shift component 755 can enable, be configured as, or be able to operate as a means for applying a cyclic shift offset for each respective RB of the set of multiple RBs.

[0108] In some examples, and to support transmitting the sidelink feedback message, the feedback component 735 can enable, be configured as, or be able to operate as a means for transmitting the sidelink feedback message on the set of multiple RBs through transmission of a sequence, a length of the sequence being associated with a quantity of the set of multiple RBs. In some examples, a length of a type of the sequence is associated with the length of the sequence.

[0109] In some examples, and to support transmitting the sidelink feedback message, the feedback component 735 can enable, be configured as, or be able to operate as a means for transmitting the sidelink feedback message on the set of multiple RBs through transmission of one or more repetitions of the sidelink feedback message on the set of multiple RBs and on multiple symbols. In some examples, and to support transmitting the sidelink feedback message, the TD-OCC component 740 can enable, be configured as, or be able to operate as a means for applying TD-OCC to the transmission of the one or more repetitions of the sidelink feedback message in accordance with a quantity of the set of multiple RBs exceeding a threshold.

[0110] In some examples, the multiplexing component 760 can be configured as, be, or work with, means for multiplexing the sidelink feedback message with the additional sidelink feedback message according to an application of TD-OCC.

[0111] In some examples, the control message component 745 can be configured as, be, or work with, means for receiving a control message prior to transmission of the sidelink feedback message over the set of multiple RBs, where the control message indicates, on a per-resource pool basis, a quantity of the set of multiple RBs and a starting RB of the set of multiple RBs over which to begin transmission of the sidelink feedback message. In some examples, the control message indicates a frequency grid corresponding to the set of multiple RBs.

[0112] In some examples, to support receiving the control message, the bitmap component 765 can be configured as, be, or work with, means for receiving a bitmap indicating the set of multiple RBs, where each bit of the bitmap indicates a corresponding RB of the set of multiple RBs.

[0113] In some examples, to support transmitting the sidelink feedback message, the feedback component 735 can be configured as, be, or work with, means for transmitting the sidelink feedback message over more than two symbols through application of a mapping of the sidelink feedback message to a quantity of RBs of the sidelink slot structure. In some examples, to support transmitting the sidelink feedback message, the FD-OCC component 750 can be configured as, be, or work with, means for applying FD-OCC to transmission of the sidelink feedback message over more than two symbols of the sidelink slot structure.

[0114] In some examples, to support transmitting the sidelink feedback message, the feedback component 735 can be configured as, be, or work with, means for transmitting the sidelink feedback message over more than two symbols by repeating the sidelink feedback message on a per-symbol quantity basis. In some examples, to support transmitting the feedback information, the TD-OCC component 740 can be configured as, be, or work with, means for applying TD-OCC to the repetition of the sidelink feedback message.

[0115] In some examples, the multiplexing component 760 can be configured as, be, or work with, means for multiplexing the repetition of the sidelink feedback message according to a CDM, where the CDM is associated with an order of the FD-OCC applied to the repetition of the sidelink feedback message and an order of the TD-OCC applied to the repetition of the sidelink feedback message.

[0116] In some examples, the set of multiple RBs or the more than two symbols occur in the sidelink slot structure after an AGC candidate TTI of the set of periodic AGC candidate TTIs.

[0117] Figure 8 A diagram illustrating a system 800 including a device 805 that supports transmitting sidelink feedback messages according to sidelink slot structures in accordance with one or more aspects of the present disclosure is shown. The device 805 can be an example of or include the components of device 505, device 605, or a UE 115 as described herein. The device 805 can communicate with one or more network entities 105, one or more UEs 115, or any combination thereof (e.g., wirelessly). The device 805 can include components for bi-directional voice and data communications including components for transmitting and receiving communications, such as a communications manager 820, an input / output (I / O) controller 810, a transceiver 815, an antenna 825, at least one memory 830, code 835, and at least one processor 840. These components can be in electronic communication or operatively coupled via one or more buses (e.g., bus 845) for inter-component communication.

[0118] The I / O controller 810 can manage input and output signals for the device 805. The I / O controller 810 can also manage peripherals not integrated into the device 805. In some cases, the I / O controller 810 can represent a physical connection or port to an external peripheral. In some cases, the I / O controller 810 can utilize an operating system such as iOS®, ANDROID®, MS-DOS®, MS-WINDOWS®, OS / 2®, UNIX®, LINUX®, or another known operating system. Additionally or alternatively, the I / O controller 810 can represent or interact with a modem, a keyboard, a mouse, a touchscreen, or similar devices. In some cases, the I / O controller 810 can be implemented as part of, or as an ® ® ® ® ® ® ®

[0119] ​​​​​​​In some cases, the device 805 can include a single antenna 825. However, in some other cases the device 805 can have more than one antenna 825, which can be capable of concurrently sending or receiving multiple wireless transmissions. The transceiver 815 can communicate bi-directionally, via the one or more antennas 825, wired, or wireless links as described herein. For example, the transceiver 815 can represent a wireless transceiver and can communicate bi-directionally with another wireless transceiver. The transceiver 815 can also include a modem to modulate the packets and to demodulate packets received from one or more antennas 825. The transceiver 815, or the transceiver 815 and one or more antennas 825, can be an example of a transmitter 515, a transmitter 615, a receiver 510, a receiver 610, or any combination thereof, or components thereof, as described herein.

[0120] The at least one memory 830 can include random access memory (RAM) and read only memory (ROM). The at least one memory 830 can store computer-readable, computer- executable code 835 including instructions that, when executed by the at least one processor 840, cause the device 805 to perform various functions described herein. The code 835 can be stored in a non-transitory computer-readable medium such as system memory or another type of memory. In some cases, the code 835 can not be directly executable by the at least one processor 840 but can cause a computer (e.g., when compiled and executed) to perform functions described herein. In some cases, the at least one memory 830 can include, among other things, a basic I / O system (BIOS), which can

[0121] The at least one processor 840 can 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 at least one processor 840 can be configured to operate a memory array. In some other cases, a memory controller can be integrated into the at least one processor 840. The at least one processor 840 can be configured to execute computer-readable instructions stored in a memory (e.g., the at least one memory 830) to cause the device 805 to perform various functions (e.g., functions or tasks supporting transmitting sidelink feedback messages according to a sidelink slot structure). For example, the device 805 or a component of the device 805 can include the at least one processor 840 and the at least one memory 830 coupled with or to the at least one processor 840, the at least one processor 840 and the at least one memory 830 configured to perform various functions described herein. In some examples, the at least one processor 840 can include a plurality of processors, and the at least one memory 830 can include a plurality of memories. One or more processors of the plurality of processors can be coupled with one or more memories of the plurality of memories, which can be individually or collectively configured to perform various functions herein.

[0122] The communications manager 820 can support wireless communications in accordance with examples as disclosed herein. For example, the communications manager 820 can be, be configured as, or be operable support a means for participating in sidelink communications according to a sidelink slot structure used in a wireless network, where the sidelink slot structure includes a set of periodic AGC candidate TTIs that are common across the wireless network. The communications manager 820 can be, be configured as, or be operable support a means for monitoring for a sidelink message during a monitoring interval associated with the set of periodic AGC candidate TTIs that are common in the sidelink slot structure. The communications manager 820 can be, be configured as, or be operable support a means for transmitting a sidelink feedback message according to the monitoring, where a format of the sidelink feedback message is associated with uplink control channel format 0 and the sidelink feedback message is transmitted on a set of multiple RBs of the sidelink slot structure, or where the format is associated with uplink control channel format 2 and the sidelink feedback message is transmitted on more than two symbols of the sidelink slot structure.

[0123] By including or configuring the communications manager 820 in accordance with examples as described herein, the device 805 can support techniques for transmitting sidelink feedback messages according to a sidelink slot structure that can improve multiplexing capacity, increase signaling throughput, more efficiently utilize communication resources, and improve communications between UEs.

[0124] In some examples, the communication manager 820 can be configured to use or otherwise employ the transceiver 815, the one or more antennas 825, or any combination thereof, to perform various operations (e.g., receiving, monitoring, transmitting). Although the communication manager 820 is illustrated as a separate component, in some examples, one or more functions described with reference to the communication manager 820 can be supported by, or performed by, the at least one processor 840, the at least one memory 830, the code 835, or any combination thereof. For example, the code 835 can include instructions executable by the at least one processor 840 to cause the device 805 to perform various aspects of transmitting a sidelink feedback message according to a sidelink slot structure as described herein, or the at least one processor 840 and the at least one memory 830 can be otherwise configured to, individually or collectively, perform or support performance of such operations.

[0125] Figure 9 A flow diagram illustrating an example method 900 that supports transmitting a sidelink feedback message according to a sidelink slot structure in accordance with aspects of the present disclosure is shown. Operations of the method 900 can be implemented by a UE or its components as described herein. For example, operations of the method 900 can be performed by a UE 115 as described with reference to FIG. 1. In some examples, a UE can execute a set of instructions to control its functional elements to perform the functions described. Additionally or alternatively, the UE can perform aspects of the described functions using special-purpose hardware. Figures 1 to 8

[0126] At 905, the method can include participating in sidelink communications according to a sidelink slot structure used in a wireless network, where the sidelink slot structure includes a set of periodic AGC candidate TTIs that are common across the wireless network. The operations of 905 can be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 905 can be performed by a sidelink component 725 as described with reference to FIG. 7. Figure 7

[0127] At 910, the method can include monitoring for a sidelink message during a monitoring interval associated with the set of periodic AGC candidate TTIs that are common in the sidelink slot structure. The operations of 910 can be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 910 can be performed by a monitoring component 730 as described with reference to FIG. 7. Figure 7

[0128] ​​​At 915, the method can include transmitting a sidelink feedback message in accordance with the monitoring, where a format of the sidelink feedback message is associated with uplink control channel format 0 and the sidelink feedback message is transmitted on a set of multiple RBs of the sidelink slot structure, or where the format is associated with uplink control channel format 2 and the sidelink feedback message is transmitted on more than two symbols of the sidelink slot structure. The operations of 915 can be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 915 can be performed by a feedback component 735 as described with reference to Figure 7

[0129] Figure 10 A flow diagram illustrating a method 1000 that supports transmitting a sidelink feedback message in accordance with a sidelink slot structure in accordance with aspects of the present disclosure is shown. The operations of method 1000 can be implemented by a UE or its components as described herein. For example, the operations of method 1000 can be performed by a UE 115 as described with reference to Figures 1 to 8 FIGS. 11 through 14 as described with reference to FIG. 1. In some examples, a UE can execute a set of instructions to control the functional elements of the UE to perform the functions described herein. Additionally or alternatively, the UE can perform aspects of the functions described herein using special-purpose hardware.

[0130] At 1005, the method can include participating in sidelink communications in accordance with a sidelink slot structure used in a wireless network, where the sidelink slot structure includes a set of periodic AGC candidate TTIs that are common across the wireless network. The operations of 1005 can be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1005 can be performed by a sidelink component 725 as described with reference to Figure 7 FIGS. 11 through 14 as described with reference to FIG. 1. In some examples, a UE can execute a set of instructions to control the functional elements of the UE to perform the functions described herein. Additionally or alternatively, the UE can perform aspects of the functions described herein using special-purpose hardware.

[0131] At 1010, the method can include monitoring for a sidelink message during a monitoring interval associated with the set of periodic AGC candidate TTIs that are common in the sidelink slot structure. The operations of 1010 can be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1010 can be performed by a monitoring component 730 as described with reference to Figure 7 FIGS. 11 through 14 as described with reference to FIG. 1. In some examples, a UE can execute a set of instructions to control the functional elements of the UE to perform the functions described herein. Additionally or alternatively, the UE can perform aspects of the functions described herein using special-purpose hardware.

[0132] At 1015, the method can include transmitting a sidelink feedback message in accordance with the monitoring on the set of multiple RBs by transmission of a set of multiple repetitions of the sidelink feedback message. The operations of 1015 can be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1015 can be performed by a feedback component 735 as described with reference to Figure 7 FIGS. 11 through 14 as described with reference to FIG. 1. In some examples, a UE can execute a set of instructions to control the functional elements of the UE to perform the functions described herein. Additionally or alternatively, the UE can perform aspects of the functions described herein using special-purpose hardware.

[0133] Figure 11 ​A flow diagram illustrating an example method 1100 that supports transmitting sidelink feedback messages according to a sidelink slot structure in accordance with aspects of the present disclosure is shown. The operations of method 1100 can be implemented by a UE or its components as described herein. For example, the operations of method 1100 can be performed by a UE 115 as described with reference to FIGs. 1-2, 4, and 5. In some examples, a UE can execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, a UE can perform aspects of the functions described through the use of dedicated hardware, a Figures 1 to 8

[0134] At 1105, the method can include participating in sidelink communications according to a sidelink slot structure used in a wireless network, where the sidelink slot structure includes a set of periodic AGC candidate TTIs that are common across the wireless network. The operations of 1105 can be performed according to the examples as disclosed herein. In some examples, aspects of the operations of 1105 can be performed by a sidelink component 725 as described with reference to FIGs. 1-2, 4, and 5. Figure 7

[0135] At 1110, the method can include monitoring for a sidelink message during a monitoring interval associated with the set of periodic AGC candidate TTIs that are common in the sidelink slot structure. The operations of 1110 can be performed according to the examples as disclosed herein. In some examples, aspects of the operations of 1110 can be performed by a monitoring component 730 as described with reference to FIGs. 1-2, 4, and 5. Figure 7

[0136] At 1115, the method can include receiving a control message prior to the transmission of the sidelink feedback message over the set of RBs, where the control message indicates a number of the set of RBs and a starting RB in the set of RBs over which to begin transmission of the sidelink feedback message on a per-resource pool basis. The operations of 1115 can be performed according to the examples as disclosed herein. In some examples, aspects of the operations of 1115 can be performed by a control message component 745 as described with reference to FIGs. 1-2, 4, and 5. Figure 7

[0137] At 1120, the method can include transmitting the sidelink feedback message according to the monitoring, where a format of the sidelink feedback message is associated with an uplink control channel format 0 and the sidelink feedback message is transmitted over the set of RBs of the sidelink slot structure. The operations of 1120 can be performed according to the examples as disclosed herein. In some examples, aspects of the operations of 1120 can be performed by a feedback component 735 as described with reference to FIGs. 1-2, 4, and 5. Figure 7

[0138] Figure 12 ​​​​​A flow diagram illustrating an example method 1200 that supports transmitting sidelink feedback messages according to a sidelink slot structure in accordance with aspects of the present disclosure is shown. The operations of method 1200 can be implemented by a UE or its components as described herein. For example, the operations of method 1200 can be performed by a UE 115 as described with reference to FIGs. 1-9. Figures 1 to 8 In some examples, a UE can execute a set of instructions to control the functional elements of the UE to perform the described functions. Additionally or alternatively, the UE can perform aspects of the described functions using special-purpose hardware.

[0139] At 1205, the method can include participating in sidelink communications according to a sidelink slot structure used in a wireless network, where the sidelink slot structure includes a set of periodic AGC candidate TTIs that are common across the wireless network. The operations of 1205 can be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1205 can be performed by a sidelink component 725 as described with reference to FIGs. 1-9. Figure 7

[0140] At 1210, the method can include monitoring for a sidelink message during a monitoring interval associated with the set of periodic AGC candidate TTIs that are common in the sidelink slot structure. The operations of 1210 can be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1210 can be performed by a monitoring component 730 as described with reference to FIGs. 1-9. Figure 7

[0141] At 1215, the method can include transmitting a sidelink feedback message according to monitoring over more than two symbols by application of a mapping of more than two symbols to a number of RBs of the sidelink slot structure. The operations of 1215 can be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1215 can be performed by a feedback component 735 as described with reference to FIGs. 1-9. Figure 7

[0142] At 1220, the method can include applying an FD-OCC to transmission of the sidelink feedback message over more than two symbols of the sidelink slot structure. The operations of 1220 can be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of 1220 can be performed by an FD-OCC component 750 as described with reference to FIGs. 1-9. Figure 7

[0143] An overview of aspects of the present disclosure is provided below: ​​​​Aspect 1 : A method for wireless communication at a UE, comprising: participating in sidelink communications according to a sidelink slot structure used in a wireless network, wherein the sidelink slot structure comprises a set of periodic AGC candidate TTIs that are common across the wireless network; monitoring for a sidelink message during a monitoring interval associated with the set of common periodic AGC candidate TTIs in the sidelink slot structure; and transmitting a sidelink feedback message according to the monitoring, wherein a format of the sidelink feedback message is associated with uplink control channel format 0 and the sidelink feedback message is transmitted on a plurality of RBs of the sidelink slot structure, or wherein the format is associated with uplink control channel format 2 and the sidelink feedback message is transmitted on more than two symbols of the sidelink slot structure.

[0144] Aspect 2: The method of aspect 1, wherein transmitting the sidelink feedback message comprises transmitting the sidelink feedback message on the plurality of RBs through transmission of a plurality of repetitions of the sidelink feedback message.

[0145] Aspect 3: The method of aspect 2, wherein transmitting the sidelink feedback message on the plurality of RBs comprises applying a cyclic shift offset for each respective RB of the plurality of RBs.

[0146] Aspect 4: The method of any of aspects 1-3, wherein transmitting the sidelink feedback message comprises transmitting the sidelink feedback message on the plurality of RBs through transmission of a sequence of a length associated with a number of the plurality of RBs.

[0147] Aspect 5: The method of aspect 4, wherein a length of a type of the sequence is associated with the length of the sequence.

[0148] Aspect 6: The method of any of aspects 1-5, wherein transmitting the sidelink feedback message comprises transmitting the sidelink feedback message on the plurality of RBs through transmission of one or more repetitions of the sidelink feedback message on the plurality of RBs and on a plurality of symbols; and applying a TD-OCC to the transmission of the one or more repetitions of the sidelink feedback message according to a number of the plurality of RBs exceeding a threshold.

[0149] Aspect 7: The method of aspect 6, further comprising multiplexing the sidelink feedback message with an additional sidelink feedback message according to the application of the TD-OCC.

[0150] Aspect 8: The method of any of aspects 1-7, further comprising: receiving a control message prior to transmission of the sidelink feedback message over the plurality of RBs, wherein the control message indicates a number of the plurality of RBs and a starting RB of the plurality of RBs over which to begin the transmission of the sidelink feedback message on a per-resource pool basis.

[0151] Aspect 9: The method of aspect 8, wherein the control message indicates a frequency grid corresponding to the plurality of RBs.

[0152] Aspect 10: The method of any of aspects 8-9, wherein receiving the control message comprises: receiving a bitmap indicating the plurality of RBs, wherein each bit of the bitmap indicates a corresponding RB of the plurality of RBs.

[0153] Aspect 11: The method of any of aspects 1-10, wherein transmitting the sidelink feedback message comprises: transmitting the sidelink feedback message over the more than two symbols by application of a mapping of the more than two symbols to a number of RBs of the sidelink slot structure; and applying FD-OCC to the transmission of the sidelink feedback message over the more than two symbols of the sidelink slot structure.

[0154] Aspect 12: The method of any of aspects 1-11, wherein transmitting the sidelink feedback message comprises: transmitting the sidelink feedback message over the more than two symbols by repetition of the sidelink feedback message on a per-symbol number basis; and applying TD-OCC to the repetition of the sidelink feedback message.

[0155] Aspect 13: The method of aspect 12, further comprising: multiplexing the repetition of the sidelink feedback message according to CDM, wherein the CDM is associated with an order of FD-OCC applied to the repetition of the sidelink feedback message and an order of the TD-OCC applied to the repetition of the sidelink feedback message.

[0156] Aspect 14: The method of any of aspects 1-13, wherein the plurality of RBs or the more than two symbols occur in the sidelink slot structure after an AGC candidate TTI of the set of periodic AGC candidate TTIs.

[0157] Aspect 15: A UE for wireless communication, comprising: one or more memories storing processor-executable code; and one or more processors coupled with the one or more memories and capable of individually or collectively executing the code to cause the UE to perform the method of any of aspects 1 through 14.

[0158] Aspect 16: A UE for wireless communication, comprising at least one means for performing a method of any of aspects 1 through 14.

[0159] Aspect 17: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform a method of any of aspects 1 through 14.

[0160] It should be noted that the methods described herein describe possible implementations, and that the operations and the steps can be rearranged or otherwise modified and that other implementations are possible. Further, aspects from two or more of the methods can be combined.

[0161] Although aspects of an LTE, LTE-A, LTE-A Pro, or NR system can be described for purposes of example, and LTE, LTE-A, LTE-A Pro, or NR terminology can be used in much of the description, the techniques described herein are applicable beyond LTE, LTE-A, LTE-A Pro, or NR networks. For example, the described techniques can 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 others.

[0162] Information and signals described herein can be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that can be referenced throughout the description can be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0163] The various illustrative blocks and components described herein can be implemented using general purpose processors, DSPs, ASICs, CPUs, FPGAs, or other programmable logic devices, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor can be a microprocessor, but in the alternative, the processor can be any processor, controller, microcontroller, or state machine. The processor can also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration). The various functions and operations described herein as being able to be performed by a processor can be performed by a plurality of processors collectively or individually.

[0164] The functions described herein can be implemented in hardware, software executed by a processor, firmware, or any combination thereof. When implemented in software executed by a processor, the functions can be stored or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope of the disclosure and appended claims. For example, due to the nature of software, functions described herein can be implemented using software executed by a processor, hardware, firmware, hardwiring, or combinations of any of these. Features implementing functions can also be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations.

[0165] Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A non-transitory storage medium can be any available medium that can be accessed by a general purpose or special purpose computer. By way of example, and not limitation, non-transitory computer-readable media can include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, compact disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that can be used to carry or store desired program code means in the form of instructions or data structures and that can be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Disk and disc, as used herein, includes CD, laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray® disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media. The disclosure also contemplates that where any aspect described herein is implemented using software, the software can be stored in one or more of the identified memories and / or storage devices and executed on the processor(s).

[0166] As used herein, including in the claims, “or” as used in a list of items (for example, the

[0167] As used herein, including in the claims, the article “a” is used as an open- ended term, and connotes the ideas “at least one” or “one or more.” Thus, the terms “a,” “at least one,” “one or more,” and “at least one of” can be used interchangeably. For example, where a claim recites “a component” that performs one or more functions, it is understood that each function can be performed by a single component or by any combination of components. Thus, the term “component” having a particular characteristic or performing a particular function can refer to “at least one component” having that particular characteristic or performing that particular function. Subsequent references to “the component” in the claims can refer to any or all of the one or more components. For example, a component introduced with the article “a” or “an” can be understood as meaning “one or more components” and subsequent references to “the component” in the claims can be understood as equivalent to references to “at least one of the one or more components.” Similarly, subsequent references to “the component” introduced with the article “the” or “said” as “one or more components” can refer to any or all of the one or more components. For example, subsequent references to “the one or more components” in the claims can be understood as equivalent to references to “at least one of the one or more components.”

[0168] The term “determining” encompasses a wide variety of actions and, therefore, “determining” can include calculating, computing, processing, deriving, looking up (such as via a table, a database, or another data structure), ascertaining and the like. Also, “determining” can include receiving (such as receiving information), accessing (such as accessing data in a memory), and the like. Also, “determining” can include resolving, selecting, choosing, establishing, and other such similar actions.

[0169] In the drawings, like reference numerals can be used to denote similar components throughout the several views. Additionally, various components of the same type can be distinguished from each other by a second label appended to the type reference numeral. For example, reference numeral 102 can be used to denote one component and reference numeral 102a-102n can be used to denote a second, similar component. If only the first reference numeral is used in the specification, the description can be applicable to any one of the similar components bearing the first reference numeral, unless otherwise clear from the context.

[0170] The description set forth herein, in connection with the appended drawings, describes example configurations and does not represent all the examples that can be implemented or that are within the scope of the claims. The term “example” is used herein to mean “serving as an example, instance, or illustration,” and not “preferred” or “advantageous over other examples.” The detailed description includes specific details for the purpose of providing an understanding of the described techniques. These techniques, however, can be practiced without these specific details. In some instances, well-known structures and devices are shown in block diagram form in order to avoid obscuring the concepts of the described examples.

[0171] The description herein is presented to enable any person skilled in the art to practice the present disclosure. Various modifications to the disclosure can be made by persons skilled in the art, and the disclosure can be applied to other situations other than the one specifically described herein, without departing from the scope of the present disclosure. Accordingly, the disclosure is not to be considered as limited to the examples and designs described herein, but rather to include all modifications falling within the scope of the disclosure.

Claims

1. A user equipment (UE), the user equipment (UE) comprising: One or more memories, wherein the one or more memories store processor-executable code; and One or more processors, coupled to one or more memories and capable of operating individually or jointly to execute the code to enable the UE: Participating in sidelink communication based on the sidelink time slot structure used in the wireless network, wherein the sidelink time slot structure includes a set of periodic automatic gain control candidate transmission time intervals that are common across the wireless network; Monitor sidelink messages during a monitoring interval associated with the common set of periodic automatic gain control candidate transmission time intervals in the sidelink time slot structure; as well as A sidelink feedback message is sent based on the monitoring, wherein the format of the sidelink feedback message is associated with uplink control channel format 0 and the sidelink feedback message is sent on multiple resource blocks of the sidelink time slot structure, or wherein the format is associated with uplink control channel format 2 and the sidelink feedback message is sent on more than two symbols of the sidelink time slot structure.

2. The UE according to claim 1, wherein, In order to send the sidelink feedback message, the one or more processors can operate individually or jointly to execute the code to enable the UE to: The sidelink feedback message is sent on the multiple resource blocks by sending multiple repeated sidelink feedback messages.

3. The UE according to claim 2, wherein, In order to send the sidelink feedback message on the multiple resource blocks, the one or more processors can operate individually or jointly to execute the code to enable the UE to: A cyclic shift offset is applied to each of the plurality of resource blocks.

4. The UE according to claim 1, wherein, In order to send the sidelink feedback message, the one or more processors can operate individually or jointly to execute the code to enable the UE to: The sidelink feedback message is sent over the plurality of resource blocks by sending a sequence of lengths associated with the number of the plurality of resource blocks.

5. The UE of claim 4, wherein the length of the type of the sequence is associated with the length of the sequence.

6. The UE according to claim 1, wherein, In order to send the sidelink feedback message, the one or more processors can operate individually or jointly to execute the code to enable the UE to: The sidelink feedback message is sent on the plurality of resource blocks by sending one or more repetitions of the sidelink feedback message on the plurality of resource blocks and on the plurality of symbols; as well as The temporal orthogonal overlay code is applied to the one or more repeated transmissions of the sidelink feedback message based on the number of the plurality of resource blocks exceeding a threshold.

7. The UE of claim 6, wherein the one or more processors are further capable of operating individually or jointly to execute the code to cause the UE to: The sidelink feedback message and the additional sidelink feedback message are multiplexed based on the application of the time-domain orthogonal overlay code.

8. The UE of claim 1, wherein the one or more processors are further capable of operating individually or jointly to execute the code to cause the UE to: A control message is received prior to the transmission of the sidelink feedback message on the plurality of resource blocks, wherein the control message indicates, on a per resource pool basis, the number of the plurality of resource blocks and the starting resource block on which the transmission of the sidelink feedback message is to begin.

9. The UE of claim 8, wherein the control message indicates a frequency grid corresponding to the plurality of resource blocks.

10. The UE according to claim 8, wherein, In order to receive the control message, the one or more processors can operate individually or jointly to execute the code to enable the UE to: Receive a bitmap indicating the plurality of resource blocks, wherein each bit of the bitmap indicates a corresponding resource block among the plurality of resource blocks.

11. The UE according to claim 1, wherein, In order to send the sidelink feedback message, the one or more processors can operate individually or jointly to execute the code to enable the UE to: The sidelink feedback message is sent on the more than two symbols by applying the mapping of the more than two symbols to a certain number of resource blocks of the sidelink time slot structure; as well as The frequency domain orthogonal overlay code is applied to the transmission of the sidelink feedback message on more than two symbols of the sidelink time slot structure.

12. The UE according to claim 1, wherein, In order to send the sidelink feedback message, the one or more processors can operate individually or jointly to execute the code to enable the UE to: The sidelink feedback message is sent on the more than two symbols by repeating the sidelink feedback message based on the number of symbols per symbol; as well as The time-domain orthogonal overlay code is applied to the repetition of the sidelink feedback message.

13. The UE of claim 12, wherein the one or more processors are further capable of operating individually or jointly to execute the code to cause the UE to: The code division multiplexing reuses the repetition of the sidelink feedback message, wherein the code division multiplexing is associated with the order of the frequency domain orthogonal overlay codes applied to the repetition of the sidelink feedback message and the order of the time domain orthogonal overlay codes applied to the repetition of the sidelink feedback message.

14. The UE of claim 1, wherein the plurality of resource blocks or the more than two symbols appear in the side link time slot structure after the automatic gain control candidate transmission time interval in the set of periodic automatic gain control candidate transmission time intervals.

15. A method for conducting wireless communication at a user equipment (UE), the method comprising: Participating in sidelink communication based on the sidelink time slot structure used in the wireless network, wherein the sidelink time slot structure includes a set of periodic automatic gain control candidate transmission time intervals that are common across the wireless network; Monitor sidelink messages during a monitoring interval associated with the common set of periodic automatic gain control candidate transmission time intervals in the sidelink time slot structure; as well as A sidelink feedback message is sent based on the monitoring, wherein the format of the sidelink feedback message is associated with uplink control channel format 0 and the sidelink feedback message is sent on multiple resource blocks of the sidelink time slot structure, or wherein the format is associated with uplink control channel format 2 and the sidelink feedback message is sent on more than two symbols of the sidelink time slot structure.

16. The method of claim 15, wherein sending the sidelink feedback message comprises: The sidelink feedback message is sent on the multiple resource blocks by sending multiple repeated sidelink feedback messages.

17. The method of claim 16, wherein sending the sidelink feedback message on the plurality of resource blocks comprises: A cyclic shift offset is applied to each of the plurality of resource blocks.

18. The method of claim 15, wherein sending the sidelink feedback message comprises: The sidelink feedback message is sent over the plurality of resource blocks by sending a sequence of lengths associated with the number of the plurality of resource blocks.

19. The method of claim 18, wherein the length of the type of the sequence is associated with the length of the sequence.

20. The method of claim 15, wherein sending the sidelink feedback message comprises: The sidelink feedback message is sent on the plurality of resource blocks by sending one or more repetitions of the sidelink feedback message on the plurality of resource blocks and on the plurality of symbols; as well as The temporal orthogonal overlay code is applied to the one or more repeated transmissions of the sidelink feedback message based on the number of the plurality of resource blocks exceeding a threshold.

21. The method according to claim 20, further comprising: The sidelink feedback message and the additional sidelink feedback message are multiplexed based on the application of the time-domain orthogonal overlay code.

22. The method according to claim 15, further comprising: A control message is received prior to the transmission of the sidelink feedback message on the plurality of resource blocks, wherein the control message indicates, on a per resource pool basis, the number of the plurality of resource blocks and the starting resource block on which the transmission of the sidelink feedback message is to begin.

23. The method of claim 22, wherein the control message indicates a frequency grid corresponding to the plurality of resource blocks.

24. The method of claim 22, wherein receiving the control message comprises: Receive a bitmap indicating the plurality of resource blocks, wherein each bit of the bitmap indicates a corresponding resource block among the plurality of resource blocks.

25. The method of claim 15, wherein sending the sidelink feedback message comprises: The sidelink feedback message is sent on the more than two symbols by applying the mapping of the more than two symbols to a certain number of resource blocks of the sidelink time slot structure; as well as The frequency domain orthogonal overlay code is applied to the transmission of the sidelink feedback message on more than two symbols of the sidelink time slot structure.

26. The method of claim 15, wherein sending the sidelink feedback message comprises: The sidelink feedback message is sent on the more than two symbols by repeating the sidelink feedback message based on the number of symbols per symbol; as well as The time-domain orthogonal overlay code is applied to the repetition of the sidelink feedback message.

27. The method according to claim 26, further comprising: The code division multiplexing reuses the repetition of the sidelink feedback message, wherein the code division multiplexing is associated with the order of the frequency domain orthogonal overlay codes applied to the repetition of the sidelink feedback message and the order of the time domain orthogonal overlay codes applied to the repetition of the sidelink feedback message.

28. The method of claim 15, wherein the plurality of resource blocks or the more than two symbols appear in the side link time slot structure after the automatic gain control candidate transmission time interval in the set of periodic automatic gain control candidate transmission time intervals.

29. A user equipment (UE) for wireless communication, the user equipment (UE) comprising: Components for participating in sidelink communication based on the sidelink time slot structure used in a wireless network, wherein the sidelink time slot structure includes a set of periodic automatic gain control candidate transmission time intervals that are common across the wireless network; Components for monitoring sidelink messages during a monitoring interval associated with the common set of periodic automatic gain control candidate transmission time intervals in the sidelink time slot structure; and A component for sending a sidelink feedback message based on the monitoring, wherein the format of the sidelink feedback message is associated with uplink control channel format 0 and the sidelink feedback message is sent on multiple resource blocks of the sidelink time slot structure, or wherein the format is associated with uplink control channel format 2 and the sidelink feedback message is sent on more than two symbols of the sidelink time slot structure.

30. A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by one or more processors to: Participating in sidelink communication based on the sidelink time slot structure used in the wireless network, wherein the sidelink time slot structure includes a set of periodic automatic gain control candidate transmission time intervals that are common across the wireless network; Monitor sidelink messages during a monitoring interval associated with the common set of periodic automatic gain control candidate transmission time intervals in the sidelink time slot structure; and A sidelink feedback message is sent based on the monitoring, wherein the format of the sidelink feedback message is associated with uplink control channel format 0 and the sidelink feedback message is sent on multiple resource blocks of the sidelink time slot structure, or wherein the format is associated with uplink control channel format 2 and the sidelink feedback message is sent on more than two symbols of the sidelink time slot structure.

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