Sidelink communication feedback

Abstract

To provide feedback for sidelink communications.SOLUTION: Various aspects of the present disclosure generally relate to wireless communications. In some aspects, user equipment (UE) may receive a sidelink communication on a sidelink between the UE and other UE. The UE may transmit, on the sidelink, one or more feedback communications associated with the sidelink communication in a reporting period, which has configurable periodicity and / or is configured to occupy an entire bandwidth of a resource pool configured for the sidelink. Numerous other aspects are provided.SELECTED DRAWING: Figure 4A

Description

[Technical field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to U.S. Provisional Patent Application No. 62 / 790,823, filed January 10, 2019, entitled "FEEDBACK FOR SIDELINK COMMUNICATIONS," and U.S. Nonprovisional Patent Application No. 16 / 736,702, filed January 7, 2020, entitled "FEEDBACK FOR SIDELINK COMMUNICATIONS," which are expressly incorporated herein by reference.

[0002] Aspects of the present disclosure relate generally to wireless communications, and more particularly, to techniques and apparatus for sidelink communications. [Background technology]

[0003] Wireless communication systems have been widely deployed to provide various telecommunication services, such as telephone, video, data, messaging, and broadcast. A typical wireless communication system may utilize multiple access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple access technologies include Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA) systems, Orthogonal Frequency Division Multiple Access (OFDMA) systems, Single Carrier Frequency Division Multiple Access (SC-FDMA) systems, Time Division Synchronous Code Division Multiple Access (TD-SCDMA) systems, and Long Term Evolution (LTE). LTE / LTE-Advanced is a set of extensions to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the 3rd Generation Partnership Project (3GPP®).

[0004] A wireless communication network may include a number of base stations (BSs) that can support communication for a number of user equipments (UEs). The user equipments (UEs) may communicate with the base stations (BSs) via downlinks and uplinks. The downlink (or forward link) refers to the communication link from the BS to the UE, and the uplink (or reverse link) refers to the communication link from the UE to the BS. As described in more detail herein, a BS may be referred to as a Node B, a gNB, an access point (AP), a radio head, a transmit / receive point (TRP), a New Radio (NR) BS, a 5G Node B, etc.

[0005] The above multiple access technologies have been adopted in various telecommunications standards to provide a common protocol that allows various user equipment to communicate at city, national, regional, and global levels. New Radio (NR), sometimes referred to as 5G, is a set of enhancements to the LTE mobile standard promulgated by the Third Generation Partnership Project (3GPP®). NR is designed to better support mobile broadband Internet access by increasing spectral efficiency, reducing costs, improving services, utilizing new spectrum, using Orthogonal Frequency Division Multiplexing (OFDM) with Cyclic Prefix (CP) (CP-OFDM) on the downlink (DL), CP-OFDM and / or SC-FDM (also known as Discrete Fourier Transform Spread OFDM (DFT-s-OFDM)) on the uplink (UL) to better harmonize with other open standards, as well as supporting beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation. However, as the demand for mobile broadband access continues to grow, further improvements in LTE and NR technologies are needed. Preferably, these improvements should be applicable to other multiple access technologies and telecommunications standards that utilize these technologies. Summary of the Invention [Means for solving the problem]

[0006] In some aspects, a method of wireless communication performed by a user equipment (UE) may include receiving a sidelink communication over a sidelink between the UE and another UE, and transmitting, over the sidelink, one or more feedback communications associated with the sidelink communication within a reporting period having a configurable periodicity.

[0007] In some aspects, a UE for wireless communication may include a memory and one or more processors coupled to the memory. The memory and the one or more processors may be configured to receive a sidelink communication over a sidelink between the UE and another UE. The memory and the one or more processors may be configured to transmit, over the sidelink, one or more feedback communications associated with the sidelink communication within a reporting period having a configurable periodicity.

[0008] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of a UE, may cause the one or more processors to receive a sidelink communication over a sidelink between the UE and another UE. The one or more instructions, when executed by the one or more processors of the UE, may cause the one or more processors to transmit, over the sidelink, one or more feedback communications associated with the sidelink communication within a reporting period having a configurable periodicity.

[0009] In some aspects, an apparatus for wireless communication may include means for receiving a sidelink communication over a sidelink between the apparatus and another apparatus, the apparatus may include means for transmitting, over the sidelink, one or more feedback communications associated with the sidelink communication within a reporting period having a configurable periodicity.

[0010] In some aspects, a method of wireless communication performed by a UE may include receiving a sidelink communication over a sidelink between the UE and another UE, and transmitting, over the sidelink, one or more feedback communications associated with the sidelink communication within a reporting period configured to occupy an entire bandwidth of a resource pool configured for the sidelink.

[0011] In some aspects, a UE for wireless communication may include a memory and one or more processors coupled to the memory. The memory and the one or more processors may be configured to receive a sidelink communication over a sidelink between the UE and another UE. The memory and the one or more processors may be configured to transmit, over the sidelink, one or more feedback communications associated with the sidelink communication within a reporting period configured to occupy an entire bandwidth of a resource pool configured for the sidelink.

[0012] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of a UE, may cause the one or more processors to receive a sidelink communication over a sidelink between the UE and another UE. The one or more instructions, when executed by the one or more processors of the UE, may cause the one or more processors to transmit, over the sidelink, one or more feedback communications associated with the sidelink communication within a reporting period configured to occupy an entire bandwidth of a resource pool configured for the sidelink.

[0013] In some aspects, an apparatus for wireless communication may include means for receiving a sidelink communication over a sidelink between the apparatus and another apparatus, the apparatus may include means for transmitting, over the sidelink, one or more feedback communications associated with the sidelink communication within a reporting period configured to occupy an entire bandwidth of a resource pool configured for the sidelink.

[0014] In some aspects, a method of wireless communication performed by a UE may include transmitting a sidelink communication over a sidelink between the UE and another UE, the method may include receiving, over the sidelink, one or more feedback communications associated with the sidelink communication within a reporting period having a configurable periodicity.

[0015] In some aspects, a UE for wireless communication may include a memory and one or more processors coupled to the memory. The memory and the one or more processors may be configured to transmit a sidelink communication over a sidelink between the UE and another UE. The memory and the one or more processors may be configured to receive, over the sidelink, one or more feedback communications associated with the sidelink communication within a reporting period having a configurable periodicity.

[0016] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of a UE, may cause the one or more processors to transmit a sidelink communication over a sidelink between the UE and another UE. The one or more instructions, when executed by the one or more processors of the UE, may cause the one or more processors to receive, over the sidelink, one or more feedback communications associated with the sidelink communication within a reporting period having a configurable periodicity.

[0017] In some aspects, an apparatus for wireless communication may include means for transmitting a sidelink communication over a sidelink between the apparatus and another apparatus. The apparatus may include means for receiving, over the sidelink, one or more feedback communications associated with the sidelink communication within a reporting period having a configurable periodicity.

[0018] In some aspects, a method of wireless communication performed by a UE may include transmitting a sidelink communication over a sidelink between the UE and another UE, the method may include receiving, over the sidelink, one or more feedback communications associated with the sidelink communication within a reporting period configured to occupy an entire bandwidth of a resource pool configured for the sidelink.

[0019] In some aspects, a UE for wireless communication may include a memory and one or more processors coupled to the memory. The memory and the one or more processors may be configured to transmit a sidelink communication over a sidelink between the UE and another UE. The memory and the one or more processors may be configured to receive, over the sidelink, one or more feedback communications associated with the sidelink communication within a reporting period configured to occupy an entire bandwidth of a resource pool configured for the sidelink.

[0020] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of a UE, may cause the one or more processors to transmit a sidelink communication over a sidelink between the UE and another UE. The one or more instructions, when executed by the one or more processors of the UE, may cause the one or more processors to receive, over the sidelink, one or more feedback communications associated with the sidelink communication within a reporting period configured to occupy an entire bandwidth of a resource pool configured for the sidelink.

[0021] In some aspects, an apparatus for wireless communication may include means for transmitting a sidelink communication over a sidelink between the apparatus and another apparatus, the apparatus may include means for receiving, over the sidelink, one or more feedback communications associated with the sidelink communication within a reporting period configured to occupy an entire bandwidth of a resource pool configured for the sidelink.

[0022] Aspects generally include methods, apparatus, systems, computer program products, non-transitory computer-readable media, user equipment, base stations, wireless communication devices, and processing systems, as fully described herein with reference to and as illustrated by the accompanying drawings and this specification.

[0023] The foregoing has outlined rather broadly the features and technical advantages of examples according to the present disclosure in order that the detailed description that follows may be better understood. Additional features and advantages are described below. The concepts and examples disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The characteristics of the concepts disclosed herein, both their organization and methods of operation, together with associated advantages, will be better understood from the following description when considered in conjunction with the accompanying figures. Each of the figures is provided for the purpose of illustration and explanation, and not as a definition of the limits of the claims.

[0024] So that the above-mentioned features of the present disclosure can be understood in detail, a more detailed description, briefly summarized above, may be made by referring to embodiments, some of which are shown in the attached drawings. It should be noted, however, that the description may admit of other equally valid embodiments, and that the attached drawings show only some typical embodiments of the present disclosure and therefore should not be considered as limiting its scope. The same reference numbers in different drawings may identify the same or similar elements. [Brief description of the drawings]

[0025] [Figure 1] FIG. 1 is a block diagram conceptually illustrating an example of a wireless communication network, in accordance with various aspects of the present disclosure. [Diagram 2] FIG. 1 is a block diagram conceptually illustrating an example of a base station in communication with a user equipment (UE) in a wireless communication network, in accordance with various aspects of the present disclosure. [Diagram 3] FIG. 2 is a block diagram conceptually illustrating an example of a frame structure in a wireless communication network, in accordance with various aspects of the present disclosure. [Figure 4A] FIG. 1 illustrates one or more examples of feedback of sidelink communications, in accordance with various aspects of the present disclosure. [Figure 4B] FIG. 1 illustrates one or more examples of feedback of sidelink communications, in accordance with various aspects of the present disclosure. [Figure 4C] FIG. 1 illustrates one or more examples of feedback of sidelink communications, in accordance with various aspects of the present disclosure. [Figure 4D] FIG. 1 illustrates one or more examples of feedback of sidelink communications, in accordance with various aspects of the present disclosure. [Diagram 5] A diagram illustrating one or more example processes performed, for example, by a UE, in accordance with various aspects of the present disclosure. [Figure 6] A diagram illustrating one or more example processes performed, for example, by a UE, in accordance with various aspects of the present disclosure. [Figure 7] A diagram illustrating one or more example processes performed, for example, by a UE, in accordance with various aspects of the present disclosure. [Figure 8] A diagram illustrating one or more example processes performed, for example, by a UE, in accordance with various aspects of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] In some cases, two or more subordinate entities (e.g., UEs) may communicate with each other using sidelink signals. Real-world applications of such sidelink communications may include public safety, proximity services, UE-to-network relaying, vehicle-to-everything (V2X) communications, Internet of Everything (IoE) communications, IoT communications, mission-critical mesh, and / or various other suitable applications. In general, a sidelink signal may refer to a signal communicated from one subordinate entity (e.g., UE1) to another subordinate entity (e.g., UE2) without relaying the communication through a scheduling entity (e.g., UE or BS), even though a scheduling entity may be utilized for scheduling and / or control purposes. In some examples, sidelink signals may be communicated using a licensed spectrum (unlike wireless local area networks, which may use unlicensed spectrum).

[0027] In some cases, a UE may provide feedback of a communication received from another UE on the sidelink. The UE may transmit the feedback in one or more feedback communications. The one or more feedback communications may be transmitted in one or more feedback report symbols included in a frame structure for the sidelink. In some cases, the frame structure for the sidelink may include a feedback report symbol in each slot in the frame structure. However, the UE is not required to provide feedback in all slots in the frame structure. As a result, there may be unused (and therefore wasted) symbols in each slot. These unused symbols reduce the efficiency of the frame structure, for example, since they may be reused for other uses.

[0028] Furthermore, the feedback report symbols may be bounded by additional symbols for turnaround from receive (Rx) to transmit (Tx) and vice versa. Because the sidelink may be half-duplex, a UE may require one or more turnaround symbols to transition from Rx mode to Tx mode to transmit one or more communications and then back from Tx mode after the transmission is completed. The addition of these turnaround symbols in each slot in the frame structure may significantly increase the feedback reporting overhead on the sidelink if each slot in the frame structure includes one or more symbols for reporting feedback.

[0029] In other cases, the feedback report symbol may be configured or scheduled on an ad-hoc basis. For example, a UE may receive a communication in a first slot and transmit feedback of the communication in a feedback report symbol in a second slot that occurs at a preconfigured offset from the first slot (e.g., a particular amount of slots from the first slot). However, the feedback report symbol may overlap with other transmissions in the second slot, which may cause automatic gain control settling issues. For example, the other transmissions in the second slot may start with the automatic gain control parameters settling. When the UE transmits feedback in the feedback report symbol in the second slot and the feedback transmission overlaps with other transmissions in the second slot, the overlap may cause an increase in transmit power in the second slot. The automatic gain control parameters are no longer accurate for the other transmissions as a result of the increase in transmit power, which may corrupt the other transmissions.

[0030] Some aspects described herein provide techniques and apparatus for feedback of sidelink communications. In some aspects, a UE may receive a sidelink communication over a sidelink between the UE and another UE. The UE may transmit one or more feedback communications associated with the sidelink communication over the sidelink within a reporting period. In one or more examples, a reporting period may be configured such that one or more feedback report symbols for transmission of the one or more feedback communications are included in only a subset of slots included in a frame structure of the sidelink, rather than in all slots. The reporting period may have a configurable periodicity (e.g., by the UE, by a base station, by another entity, etc.), such that the reporting period may be configured to have a single-slot periodicity (e.g., the reporting period occurs for every slot included in the frame structure) or a multi-slot periodicity (e.g., the reporting period spans multiple slots, such that feedback report symbols in the feedback reporting period occur in a subset of slots included in the frame structure, rather than in all slots). In this way, the amount of overhead consumed by feedback reporting on the sidelink and / or unused feedback report symbols may be reduced when the reporting period is configured in a multi-slot period, which may increase the efficiency of the frame structure.

[0031] The reporting period and corresponding feedback resources may be configured in all UEs and thus system-wide. Furthermore, the reporting period (e.g., feedback report symbols in a reporting period) may be configured to occupy the entire bandwidth of the sidelink resource pool. In this way, other transmitters (e.g., other UEs) may generate gaps in their transmissions during the reporting period (e.g., feedback report symbols in a reporting period) to reduce or prevent overlap of feedback transmissions with other types of transmissions. Reducing overlap of feedback transmissions reduces automatic gain control settling issues, reduces the possibility of transmission corruption, etc.

[0032] The feedback communication may be transmitted in one or more resource blocks of one or more feedback report symbols based at least in part on when the transmission of the corresponding sidelink communication is completed. To enable feedback differentiation, different transmit frequency division multiplexing (FDM) approaches may be employed, which ensures that there is a deterministic relationship between the transmission and the corresponding feedback. There may be different types of feedback, e.g., hybrid automatic repeat request (HARQ) feedback, channel state information (CSI) feedback, etc. In some aspects, different reporting periods may be configured for different types of feedback. For example, different reporting periods may be configured for HARQ feedback and CSI feedback.

[0033] Various aspects of the present disclosure will be described more fully below with reference to the accompanying drawings. However, the present disclosure may be implemented in many different forms and should not be construed as being limited to any specific structure or function presented throughout the present disclosure. Rather, these aspects are designed so that the disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Based on the teachings herein, those skilled in the art should appreciate that the scope of the present disclosure encompasses any aspect of the present disclosure disclosed herein, whether implemented independently of or in combination with any other aspect of the present disclosure. For example, an apparatus may be implemented or a method may be practiced using any number of the aspects described herein. In addition, the scope of the present disclosure encompasses an apparatus or method practiced using other structures, functions, or structures and functions in addition to or other than the various aspects of the disclosure described herein. It should be understood that any aspect of the present disclosure disclosed herein may be implemented by one or more elements of a claim.

[0034] Several aspects of a telecommunications system are now presented with reference to various apparatus and techniques. These apparatus and techniques are described in the following detailed description and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as "elements"). These elements may be implemented using hardware, software, or a combination thereof. Whether such elements are implemented as hardware or software depends on the particular application and design constraints imposed on the overall system.

[0035] Although aspects may be described herein using terminology commonly associated with 3G and / or 4G wireless technology, it should be noted that aspects of the present disclosure may also be applied in other generation-based communication systems, such as 5G and beyond, including NR technology.

[0036] FIG. 1 is a diagram illustrating a wireless network 100 in which aspects of the present disclosure may be practiced. The network 100 may be an LTE network, a 5G or NR network, etc. The wireless network 100 may include several BSs 110 (shown as BS 110a, BS 110b, BS 110c, and BS 110d) and other network entities. A BS is an entity that communicates with user equipment (UE) and may also be referred to as a base station, NR BS, Node B, gNB, 5G Node B (NB), access point, transmit reception point (TRP), etc. Each BS may provide communication coverage for a particular geographic area. In 3GPP, the term "cell" may refer to a coverage area of ​​a BS and / or a BS subsystem serving this coverage area, depending on the context in which the term is used.

[0037] A BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and / or another type of cell. A macro cell may cover a relatively large geographic area (e.g., a few kilometers in radius) and may allow unrestricted access by UEs with a service subscription. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with a service subscription. A femto cell may cover a relatively small geographic area (e.g., a home) and may allow restricted access by UEs with an association with the femto cell (e.g., UEs in a Closed Subscriber Group (CSG)). A BS for a macro cell may be referred to as a macro BS. A BS for a pico cell may be referred to as a pico BS. A BS for a femto cell may be referred to as a femto BS or a home BS. In the example shown in FIG. 1, BS 110a may be a macro BS for macro cell 102a, BS 110b may be a pico BS for pico cell 102b, and BS 110c may be a femto BS for femto cell 102c. A BS may support one or multiple (e.g., three) cells. The terms “eNB,” “base station,” “NR BS,” “gNB,” “TRP,” “AP,” “Node B,” “5G NB,” and “cell” may be used interchangeably herein.

[0038] In some examples, the cells may not necessarily be fixed and the geographic area of ​​the cells may move according to the location of the mobile BS. In some examples, the BSs may be interconnected to each other and / or to one or more other BSs or network nodes (not shown) in the wireless network 100 through various types of backhaul interfaces, such as direct physical connections, virtual networks, etc., using any suitable transport network.

[0039] Wireless network 100 may also include relay stations. A relay station is an entity that can receive a transmission of data from an upstream station (e.g., a BS or a UE) and send the transmission of the data to a downstream station (e.g., a UE or a BS). A relay station may also be a UE that can relay transmissions for other UEs. In the example shown in FIG. 1, relay station 110d may communicate with macro BS 110a and UE 120d to facilitate communication between BS 110a and UE 120d. A relay station may also be referred to as a relay BS, a relay base station, a relay, etc.

[0040] Wireless network 100 may be a heterogeneous network including different types of BSs, e.g., macro BSs, pico BSs, femto BSs, relay BSs, etc. These different types of BSs may have different transmit power levels, different coverage areas, and different susceptibility to interference in wireless network 100. For example, a macro BS may have a high transmit power level (e.g., 5-40 watts), while a pico BS, femto BS, and relay BS may have a lower transmit power level (e.g., 0.1-2 watts).

[0041] A network controller 130 may couple to a set of BSs and provide coordination and control for these BSs. The network controller 130 may communicate with the BSs via a backhaul. The BSs may also communicate with each other directly or indirectly, e.g., via wireless or wireline backhaul.

[0042] UEs 120 (e.g., 120a, 120b, 120c, 120e, etc.) may be dispersed throughout wireless network 100, and each UE may be stationary or mobile. A UE may communicate with one or more BSs in wireless network 100 and may communicate directly with another UE (e.g., UE 120a and UE 120e, as shown in FIG. 1 ), such as via a sidelink.

[0043] A UE may also be referred to as an access terminal, terminal, mobile station, subscriber unit, station, etc. A UE may be a cellular phone (e.g., a smartphone), a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or equipment, a biometric sensor / device, a wearable device (smart watch, smart clothing, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet)), an entertainment device (e.g., music or video device, or satellite radio), a vehicle component or sensor, a smart meter / sensor, industrial manufacturing equipment, a global positioning system device, or any other suitable device configured to communicate over a wireless or wired medium.

[0044] Some UEs may be considered as machine type communication (MTC) UEs, or evolved or enhanced machine type communication (eMTC) UEs. MTC UEs and eMTC UEs include, for example, a robot, a drone, a remote device, a sensor, a meter, a monitor, a location tag, etc. that may communicate with a base station, another device (e.g., a remote device), or some other entity. A wireless node may provide, for example, connectivity for or to a network (e.g., a wide area network such as the Internet or a cellular network) via a wired or wireless communication link. Some UEs may be considered as Internet of Things (IoT) devices and / or may be implemented as NB-IoT (Narrowband Internet of Things) devices. Some UEs may be considered as customer premises equipment (CPE). The UE 120 may be included within a housing that houses components of the UE 120, such as a processor component, a memory component, etc.

[0045] In general, any number of wireless networks may be deployed in a given geographic area. Each wireless network may support a particular RAT and may operate on one or more frequencies. The RAT may also be referred to as a radio technology, an air interface, etc. The frequencies may also be referred to as a carrier, a frequency channel, etc. Each frequency may support a single RAT in a given geographic area to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks may be deployed.

[0046] As shown in FIG. 1 , the UE 120 may include a communications manager 140. As described in more detail elsewhere herein, the communications manager 140 may receive sidelink communications over a sidelink between the UE 120 and another UE 120 and may transmit, over the sidelink, one or more feedback communications associated with the sidelink communications within a reporting period having a configurable periodicity. As described in more detail elsewhere herein, the communications manager 140 may receive sidelink communications over a sidelink between the UE 120 and another UE 120 and may transmit, over the sidelink, one or more feedback communications associated with the sidelink communications within a reporting period configured to occupy an entire bandwidth of a resource pool configured for the sidelink, or the like. As described in more detail elsewhere herein, the communications manager 140 may transmit sidelink communications over a sidelink between the UE 120 and another UE 120 and may receive, over the sidelink, one or more feedback communications associated with the sidelink communications within a reporting period having a configurable periodicity, or the like. As described in more detail elsewhere herein, the communications manager 140 may transmit a sidelink communication over a sidelink between the UE 120 and another UE 120, and may receive, over the sidelink, one or more feedback communications associated with the sidelink communication within a reporting period configured to occupy the entire bandwidth of a resource pool configured for the sidelink, etc. Additionally or alternatively, the communications manager 140 may perform one or more other operations described herein.

[0047] As noted above, Figure 1 is presented as an example only. Other examples may differ from those described with respect to Figure 1.

[0048] 2 shows a block diagram of a design 200 of a base station 110 and a UE 120a and / or UE 120e, which may be one of the base stations and one of the UEs in FIG. 1. Base station 110 may be equipped with T antennas 234a through 234t, and UE 120 may be equipped with R antennas 252a through 252r, where in general T≧1 and R≧1.

[0049] At the base station 110, the transmit processor 220 may receive data for one or more UEs from a data source 212, select one or more modulation and coding schemes (MCS) for each UE based at least in part on a channel quality indicator (CQI) received from the UE, process (e.g., encode and modulate) the data for each UE based at least in part on the MCS selected for the UE, and provide data symbols to all UEs. The transmit processor 220 may also process system information (e.g., for semi-static resource partitioning information (SRPI), etc.) and control information (e.g., CQI requests, grants, higher layer signaling, etc.) and provide overhead symbols and control symbols. The transmit processor 220 may also generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS)) and synchronization signals (e.g., primary synchronization signals (PSS) and secondary synchronization signals (SSS)). A transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on ​​the data symbols, control symbols, overhead symbols, and / or reference symbols, if applicable, and may provide T output symbol streams to T modulators (MODs) 232a-232t. Each modulator 232 (e.g., 232a-232t) may process a respective output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. The T downlink signals from modulators 232a-232t may be transmitted via T antennas 234a-234t, respectively. According to various aspects described in more detail below, synchronization signals may be generated using location coding to convey additional information.

[0050] At UE 120a and / or UE 120e, antennas 252a-252r may receive downlink signals from base station 110 and / or other base stations and sidelink signals from another UE 120 (e.g., UE 120a may receive sidelink signals from UE 120e and / or vice versa) and provide received signals to demodulators (DEMODs) 254a-254r, respectively. Each demodulator 254 (e.g., 254a-254r) may condition (e.g., filter, amplify, downconvert, and digitize) the received signal to obtain input samples. Each demodulator 254 may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. A MIMO detector 256 may obtain the received symbols from all R demodulators 254a-254r, perform MIMO detection on the received symbols, if applicable, and provide detected symbols. The receive processor 258 may process (e.g., demodulate and decode) the detected symbols, provide decoded data for the UE 120a and / or UE 120e to a data sink 260, and provide decoded control and system information to the controller / processor 280. The channel processor may identify a reference signal received power (RSRP), a received signal strength indicator (RSSI), a reference signal received quality (RSRQ), a channel quality indicator (CQI), etc. In some aspects, one or more components of the UE 120a and / or UE 120e may be included within a housing.

[0051] On the uplink or sidelink, at UE 120a and / or UE 120e, a transmit processor 264 may receive and process data from a data source 262 and control information (e.g., for reports comprising RSRP, RSSI, RSRQ, CQI, etc.) from a controller / processor 280. The transmit processor 264 may also generate reference symbols for one or more reference signals. The symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by modulators 254a-254r (e.g., for DFT-s-OFDM, CP-OFDM, etc.) and transmitted on the uplink to the base station 110 and / or transmitted on the sidelink to another UE 120. At the base station 110, uplink signals from UE 120a, UE 120e, and other UEs may be received by antennas 234 (e.g., 234a-234t), processed by demodulator 232, detected by MIMO detector 236 if applicable, and further processed by receive processor 238 to obtain decoded data and control information sent by UE 120a and / or UE 120e. The receive processor 238 may provide the decoded data to a data sink 239 and the decoded control information to a controller / processor 240. The base station 110 may include a communication unit 244 and communicate with the network controller 130 via the communication unit 244. The network controller 130 may include a communication unit 294, a controller / processor 290, and a memory 292.

[0052] The controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120a and / or UE 120e, and / or any other components of FIG. 2 may perform one or more techniques associated with feedback of sidelink communications, as described in more detail elsewhere herein. For example, the controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120a and / or UE 120e, and / or any other components of FIG. 2 may perform or direct operations, for example, of process 500 of FIG. 5, process 600 of FIG. 6, process 700 of FIG. 7, process 800 of FIG. 8, and / or other processes described herein. The memories 242 and 282 may store data and program codes for the base station 110 and the UE 120a and / or UE 120e, respectively. The scheduler 246 may schedule UEs for data transmission on the downlink and / or uplink.

[0053] In some aspects, the UE 120 (e.g., the UE 120a and / or the UE 120e) may include means for receiving a sidelink communication over a sidelink between the UE 120 and another UE 120, means for transmitting, over the sidelink, one or more feedback communications associated with the sidelink communication within a reporting period having a configurable periodicity, etc. In some aspects, the UE 120 (e.g., the UE 120a and / or the UE 120e) may include means for receiving a sidelink communication over a sidelink between the UE 120 and another UE 120, means for transmitting, over the sidelink, one or more feedback communications associated with the sidelink communication within a reporting period configured to occupy an entire bandwidth of a resource pool configured for the sidelink, etc. In some aspects, the UE 120 (e.g., the UE 120a and / or the UE 120e) may include means for transmitting a sidelink communication over a sidelink between the UE 120 and another UE 120, means for receiving, over the sidelink, one or more feedback communications associated with the sidelink communication within a reporting period having a configurable periodicity, etc. In some aspects, the UE 120 (e.g., UE 120a and / or UE 120e) may include means for transmitting a sidelink communication over a sidelink between the UE 120 and another UE 120, means for receiving, over the sidelink, one or more feedback communications associated with the sidelink communication within a reporting period configured to occupy an entire bandwidth of a resource pool configured for the sidelink, etc. Additionally or alternatively, the UE 120 may include means for performing one or more other operations described herein. In some aspects, such means may include the communications manager 140. Additionally or alternatively, such means may include one or more components of the UE 120a and / or UE 120e described with respect to FIG. 2.

[0054] As noted above, Figure 2 is presented as an example only, and other examples may differ from those described with respect to Figure 2.

[0055] FIG. 3 illustrates an example frame structure 300 for frequency division duplexing (FDD) on a sidelink between UEs in a telecommunication system (e.g., LTE, 5G NR, etc.). A transmission timeline for the sidelink may be partitioned into units of radio frames, where t represents time. Each radio frame may have a predetermined duration (e.g., 10 milliseconds (ms)) and may be partitioned into multiple subframes with indices from 0 to 2L-1. Each subframe may include two slots. As an example, each radio frame may be partitioned into 10 subframes from 0 to 9 and 20 slots with indices from 0 to 19. Each slot may include multiple symbol periods, e.g., 7 symbol periods for a normal cyclic prefix or 6 symbol periods for an extended cyclic prefix.

[0056] In some aspects, a UE (e.g., UE 120a, UE 120e, etc.) may transmit one or more sidelink communications to another UE (e.g., UE 120a, UE 120e, etc.) on the sidelink within a transmission period that may include one or more slots included in the frame structure 300. In some aspects, the other UE may receive the one or more sidelink communications, generate feedback for the one or more sidelink communications, incorporate the feedback into one or more feedback communications, and transmit the one or more feedback communications to the UE on the sidelink in one or more symbols and / or slots included in a reporting period in the frame structure 300 configured for the sidelink.

[0057] Although some techniques are described herein with respect to frames, subframes, slots, etc., these techniques may equally apply to other types of wireless communication structures, which in 5G NR may be referred to using terminology other than “frame,” “subframe,” “slot,” etc. In some aspects, a wireless communication structure may refer to a periodic, time-limited communication unit defined by a wireless communication standard and / or protocol.

[0058] As noted above, Figure 3 is presented as an example only, and other examples may differ from those described with respect to Figure 3.

[0059] Wireless networks may support hybrid automatic repeat request (HARQ) for data transmissions on the downlink and uplink. For HARQ, a transmitter (e.g., a BS) may send one or more transmissions of a packet until the packet is correctly decoded by a receiver (e.g., a UE) or some other termination condition is encountered. For synchronous HARQ, all transmissions of a packet may be sent in subframes of a single interlace. For asynchronous HARQ, each transmission of a packet may be sent in any subframe.

[0060] 4A-4D illustrate one or more examples of feedback of sidelink communications in accordance with various aspects of the present disclosure. As shown in FIG. 4A-4D, example 400 may include communications between UE 120a and UE 120e, which may be included in a wireless network (e.g., wireless network 100) and may communicate via a sidelink. In some aspects, the sidelink may be configured in a frame structure such as frame structure 300 of FIG. 3 and / or another sidelink frame structure.

[0061] In some aspects, the sidelink frame structure may include multiple transmission periods. As shown in FIG. 4A, the transmission period may include w slots. The w slots include slot 0 through slot w−1 and may be one slot or multiple slots. The UE 120a may transmit one or more sidelink communications to the UE 120e in one or more slots included in the transmission period, and / or vice versa. The amount of w slots included in the transmission period may be configurable by a BS included in the wireless network, a network function device included in the wireless network, a network operator of the wireless network, etc. For example, the amount of w slots may be configured for the entire wireless network, for a particular UE, for a particular set of UEs, etc. In some aspects, the transmission period may include a single slot (e.g., w=1 slot). In some aspects, the transmission period may be a multi-slot transmission period including multiple slots (e.g., w>1 slot).

[0062] In some aspects, the sidelink frame structure may include multiple feedback reporting periods. As shown in FIG. 4A, the feedback reporting period may include x slots (e.g., slot 0 through slot x-1). The amount of x slots included in the feedback reporting period may be configurable by a BS included in the wireless network, a network function device included in the wireless network, a network operator of the wireless network, etc. For example, the amount of x slots may be configured for the entire wireless network, may be configured for a particular UE, may be configured for a particular set of UEs, etc. In some aspects, x may be the same amount of slots as w. In some aspects, x and w may be different amounts of slots.

[0063] In some aspects, the feedback reporting period may have a single slot period (e.g., x=1 slot). In some aspects, the feedback reporting period may have a multi-slot period. In this case, the feedback reporting period may have a length of x slots, where x>1 slot, such that each feedback reporting period may include one feedback report resource occurring every x slots. UE 120a and / or UE 120e may transmit one or more feedback communications in the feedback reporting resources within the feedback reporting period, including feedback of all or a subset of sidelink communications that complete transmission in a corresponding transmission period. In some aspects, feedback communications to be transmitted by multiple UEs in a particular feedback reporting period may be multiplexed together in the feedback reporting period. For example, the feedback communications may be time division multiplexed, frequency division multiplexed, etc. in the feedback reporting resources within the feedback reporting period.

[0064] In some aspects, the transmission period and the corresponding feedback reporting period may be arranged in adjacent sets of slots in the frame structure. For example, the transmission period may include a first set of three consecutive slots, and the corresponding feedback reporting period may include a second set of three consecutive slots that begins immediately after the completion of the first set of three consecutive slots. In some aspects, the transmission period and the corresponding feedback reporting period may be separated by one or more intervening slots. For example, as shown in example 400 of FIG. 4A, the transmission period may include a first set of w consecutive slots, and the corresponding feedback reporting period may include a set of x consecutive slots, where the set of w slots and the set of x slots may be separated by multiple intervening slots.

[0065] A feedback report resource within a feedback reporting period may include y feedback report symbols (e.g., one or more consecutive and / or adjacent symbols) included in a single slot (or a subset of slots) of the x slots included in the feedback reporting period. In some aspects, the y feedback report symbols may include one or more symbols, one or more portions of one or more symbols (e.g., one or more half symbols, a 10 μs portion of one or more symbols, one or more resource blocks (RBs) of one or more symbols, etc.) located at or near the end of a particular slot included in the feedback reporting period (e.g., the first slot included in the feedback reporting period, the last slot included in the feedback reporting period, or another slot included in the feedback reporting period). In some aspects, the y feedback report symbols may include one or more symbols located at or near the beginning of a particular slot included in the feedback reporting period. In some aspects, the y feedback report symbols may include one or more symbols located at another location within a slot included in the feedback reporting period.

[0066] In some aspects, the z turnaround symbols may be located adjacent to the y feedback report symbols. For example, one or more turnaround symbols may be located before the y feedback report symbols and one or more turnaround symbols may be located after the y feedback report symbols. In this way, if a UE that is to transmit one or more feedback communications is receiving a sidelink communication in a slot that includes the y feedback report symbols, the z turnaround symbols provide the UE with a timing buffer to transition from a receive mode to a transition mode to transmit the one or more communications and back to a receive mode to continue receiving the sidelink communication. The turnaround symbols may also be referred to as transmit-receive symbols, transmit-receive times, transmit-receive turnaround symbols, etc.

[0067] The one or more feedback communications to be transmitted within the feedback reporting period may include various types of feedback communications. For example, the one or more feedback communications may include one or more hybrid automatic repeat request (HARQ) communications transmitted on a physical sidelink feedback channel (PSFCH), one or more reference signal feedback communications to be transmitted on the PSFCH (e.g., a channel state information (CSI) feedback communication associated with a CSI reference signal (CSI-RS), a demodulation reference signal (DMRS) feedback communication, etc.).

[0068] In some aspects, the UE may transmit different types of feedback communications within the same feedback reporting period. For example, the UE may transmit a first type of feedback communication in one or more feedback symbols of the y feedback report symbols and a second type of feedback communication in one or more other feedback symbols of the y feedback report symbols, and so on. As another example, the UE may frequency division multiplex (FDM) the first type of feedback communication and the second type of feedback communication in the y feedback report symbols.

[0069] In some aspects, the UE may transmit different types of feedback communications within different feedback reporting periods, where the UE may transmit a first type of feedback communication within a first feedback reporting period, a second type of feedback communication within a second feedback reporting period, and so on.

[0070] In some aspects, different feedback transmission periods may be configured for transmitting different feedback communication types or different combinations of feedback communication types. In this way, a periodicity for transmitting a particular feedback communication type may be different from a periodicity for transmitting another feedback communication type. For example, a subset of feedback reporting periods may be configured for transmitting HARQ communication, and another subset of feedback reporting periods may be configured for transmitting HARQ communication and CSI feedback communication. This may result in a shorter periodicity for transmitting HARQ communication compared to a periodicity for transmitting HARQ communication and CSI feedback communication.

[0071] If a feedback reporting period configured for transmitting an HARQ communication occurs earlier in time with respect to a feedback reporting period configured for transmitting an HARQ communication and a CSI feedback communication, the UE may transmit an HARQ communication within the feedback reporting period configured for transmitting an HARQ communication and may transmit a CSI feedback communication in the feedback reporting period configured for transmitting an HARQ communication and a CSI feedback communication, or the UE may refrain from transmitting an HARQ communication within the feedback reporting period configured for transmitting an HARQ communication and may transmit both an HARQ communication and a CSI feedback communication within the feedback reporting period configured for transmitting an HARQ communication and a CSI feedback communication.

[0072] 4B-4D illustrate examples of UE 120a and UE 120e performing sidelink communication based at least in part on the frame structure (or a similar frame structure) 400 illustrated in FIG. 4A. As illustrated by reference numeral 402 in FIG. 4B and FIG. 4C, UE 120a may receive sidelink communication from UE 120e within a transmission period on the sidelink. The sidelink communication may include a physical sidelink shared channel (PSSCH) communication, a physical sidelink control channel (PSCCH) communication, or another type of sidelink communication. As illustrated by reference numeral 404 in FIG. 4B, UE 120a may receive the sidelink communication and may transmit one or more feedback communication associated with the sidelink communication to UE 120e. UE 120a may transmit one or more feedback communication on the PSFCH of the sidelink within a feedback reporting period associated with the transmission period. In particular, UE 120 may transmit one or more feedback communication on a feedback reporting resource within the feedback reporting period.

[0073] In some aspects, the feedback reporting period may have a single slot period (where the feedback reporting resource may occur every slot) or a multi-slot period (where the feedback reporting resource may occur every two or more slots). In some aspects, the feedback reporting period may have a configurable period such that the feedback reporting resource may be switched between occurring every slot and occurring every two or more slots. In this case, a base station (e.g., a serving base station 110 of the UE 120a or another base station 110) may configure the period of the feedback reporting period to be one slot, multiple slots, etc. In some aspects, the base station may configure the period of the feedback reporting period dynamically (e.g., via downlink control information (DCI) signaling) or semi-statically (e.g., via medium access control control element (MAC-CE) signaling or radio resource control (RRC) signaling). Thus, the UE 120a may identify the period of the feedback reporting period based at least in part on signaling received from the base station. The signaling may identify a periodicity of the reporting period, may identify a time domain resource that the feedback reporting period identifies, may identify a location of the feedback report resource within the feedback reporting period (e.g., may identify a slot within the feedback reporting period in which the feedback report resource is included (which may be the first slot, the last slot, or another slot), may identify a location of the feedback report resource within the slot in which the feedback report resource is included, etc. In this manner, UE 120a may identify a feedback reporting period and / or a feedback report resource within the feedback reporting period based at least in part on the signaling received from the base station.

[0074] Further, as shown in Figures 4C and 4D, the feedback reporting resources within the feedback reporting period may be configured to occupy the entire bandwidth of the resource pool configured for the sidelink. The resource pool configured for the sidelink may be a bandwidth portion configured for the sidelink and may include a subset of frequency domain resources (e.g., subcarriers, component carriers, subchannels, resource blocks, etc.) included in the entire frequency bandwidth allocated to the UE 120a and / or UE 120e. In this case, the resource pool configured for the sidelink may include fewer frequency resources than the frequency resources available for the access link of the UE 120a and / or UE 120e, resulting in the resource pool configured for the sidelink having a narrower frequency bandwidth for the access link. As an example, if the resource pool configured for the sidelink spans 100 resource blocks in bandwidth, the feedback reporting resources may be configured to span the entire 100 resource blocks. In this way, the entire bandwidth of the resource pool configured for the sidelink is scheduled for feedback transmissions in the feedback reporting resources, and other types of transmissions are prevented from occurring during the feedback reporting resources.

[0075] As further illustrated in FIG. 4C and FIG. 4D, in some aspects, the feedback communications (e.g., feedback communication 1 through feedback communication 5, etc.) may be frequency division multiplexed in the feedback reporting resource. The time location and / or frequency location of each feedback communication in the feedback reporting resource may be based at least in part on the slot and / or symbol in which the associated sidelink communication (e.g., communication 1 through communication 5, etc.) is received, and may be based at least in part on the subchannel, subcarrier, or resource block in which the associated sidelink communication is received, etc. In this case, each of the feedback communications may be transmitted over a subset of resource blocks included in the entire bandwidth of the resource pool configured for the sidelink. Thus, each of the feedback communications occupies a bandwidth that is less than the entire bandwidth of the resource pool configured for the sidelink. In some aspects, the combined bandwidth occupied by all of the feedback communications may be less than or equal to the resource pool configured for the sidelink. In some aspects, a single feedback communication may be configured to occupy the entire bandwidth of the resource pool configured for the sidelink. In some aspects, feedback communications may be time division multiplexed within a feedback reporting period (e.g., in feedback reporting resources included in the feedback reporting period), and feedback communications are transmitted in adjacent symbols included in the feedback reporting period (e.g., in feedback reporting resources included in the feedback reporting period).

[0076] In some aspects, the UE 120e may identify a particular feedback reporting period from multiple feedback reporting periods configured for the sidelink as a reporting period adjacent to a transmission period in which the sidelink communication was received. For example, as shown in FIG. 4C, when the UE 120e transmits feedback for the sidelink communication 5, the UE 120e may identify the reporting period based at least in part on a start slot of the reporting period being adjacent to a slot in which the transmission of the sidelink communication 5 was completed or based at least in part on a start slot of the reporting period being adjacent to an end slot of a transmission period in which the transmission of the sidelink communication 5 was completed.

[0077] In some aspects, UE 120e may identify a particular feedback reporting period from multiple feedback reporting periods configured for the sidelink as a reporting period that occurs at least a threshold amount of slots after a transmission period in which the sidelink communication was received. For example, as shown in FIG. 4D, when UE 120e transmits feedback for sidelink communication 5, UE 120e may identify the reporting period based at least in part on a start slot of the reporting period being at least a threshold amount of slots (e.g., one or more slots) after the slot in which the transmission of sidelink communication 5 was completed or based at least in part on a start slot of the reporting period being at least a threshold amount of slots (e.g., one or more slots) after the end slot of the transmission period in which the transmission of sidelink communication 5 was completed.

[0078] In some aspects, the UE 120e may identify a particular feedback reporting period from a plurality of feedback reporting periods configured for the sidelink based at least in part on various factors. In some aspects, the UE 120e may identify a particular feedback reporting period based at least in part on the processing capability of the UE 120e. For example, if the UE 120e is able to receive one or more sidelink communications, decode the one or more sidelink communications, and transmit one or more feedback communications within the next occurring feedback reporting period, the UE 120e may transmit one or more feedback communications within the next scheduled feedback reporting period. Otherwise, the UE 120e may transmit one or more feedback communications within a subsequent feedback reporting period (e.g., a feedback reporting period that occurs at least M slots offset after the transmission period ends, where M is equal to or greater than the processing capability of the UE 120e in slots) once the one or more feedback communications are ready to be transmitted.

[0079] In some aspects, the UE 120e may identify a feedback reporting period based at least in part on one or more quality of service (QoS) parameters. For example, the UE 120e may identify a feedback reporting period that meets a latency parameter for transmitting a HARQ communication, a feedback reporting period that meets a latency parameter for transmitting a CSI feedback communication, etc. As another example, the UE 120e may identify a feedback reporting period as a next scheduled feedback reporting period based at least in part on a priority parameter assigned to the UE 120e, and may identify a feedback reporting period as a subsequent feedback reporting period based at least in part on a priority parameter assigned to the UE 120e being a lower priority relative to another UE that is to transmit one or more other feedback communications in the next scheduled feedback reporting period, etc.

[0080] In this manner, the UE 120e may transmit one or more feedback communications in the y feedback report symbols included in the slots of the feedback reporting period. In this manner, the y feedback report symbols are included in a subset of slots included in the frame structure of the sidelink, as opposed to all slots, such that the feedback report symbols (and / or the associated feedback reporting period) have a multi-slot period, which reduces overhead consumed by feedback reports on the sidelink and reduces the amount of unused feedback report symbols, which increases the efficiency of the frame structure. Furthermore, the y feedback report symbols (and / or the associated feedback reporting period) may be configured to occupy the entire bandwidth of a resource pool configured for the sidelink over which the feedback communication is transmitted, such that other transmissions on the sidelink do not overlap with the feedback communication, which reduces issues with automatic gain control, reduces the amount of corrupted transmissions on the sidelink, etc.

[0081] As noted above, Figures 4A and 4B are provided as an example, other examples may differ from those described with respect to Figures 4A and 4B.

[0082] 5 illustrates an example process 500 performed, for example, by a UE, in accordance with various aspects of the present disclosure. The example process 500 is an example of a UE (e.g., UE 120, UE 120a, UE 120e, etc.) performing operations associated with feedback of sidelink communications.

[0083] 5, in some aspects, the process 500 may include receiving a sidelink communication over a sidelink between the UE and another UE (block 510). For example, the UE may receive (e.g., using the receive processor 258, the transmit processor 264, the controller / processor 280, the memory 282, etc.) the sidelink communication over the sidelink between the UE and another UE, as described above.

[0084] 5, in some aspects, the process 500 may include transmitting, over the sidelink, one or more feedback communications associated with the sidelink communication within a reporting period having a configurable periodicity (block 520). For example, the UE (e.g., using the receive processor 258, the transmit processor 264, the controller / processor 280, the memory 282, etc.) may transmit, over the sidelink, one or more feedback communications associated with the sidelink communication within a reporting period having a configurable periodicity, as described above.

[0085] Process 500 may include additional aspects, such as any single aspect or any combination of aspects described below and / or with respect to one or more other processes described elsewhere herein.

[0086] In a first aspect, the reporting period comprises a period including one or more slots. In a second aspect, alone or in combination with the first aspect, the process 500 includes identifying the reporting period based at least in part on a start slot of the reporting period being adjacent to a slot in which the sidelink communication transmission is completed. In a third aspect, alone or in combination with one or more of the first and second aspects, the process 500 includes identifying the reporting period based at least in part on the reporting period occurring at least a threshold amount of slots after the slot in which the sidelink communication transmission is completed.

[0087] In a fourth aspect, alone or in combination with one or more of the first through third aspects, transmitting one or more feedback communications within the reporting period includes transmitting one or more feedback communications in one or more symbols included in the reporting period. In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, the one or more symbols are adjacent symbols, and the reporting period includes a first transmit / receive turnaround symbol adjacent to a first symbol of the one or more symbols and a second transmit / receive turnaround symbol adjacent to a second symbol of the one or more symbols.

[0088] In a sixth aspect, alone or in combination with one or more of the first to fifth aspects, the process 500 includes identifying a reporting period based at least in part on a processing capability of the UE. In a seventh aspect, alone or in combination with one or more of the first to sixth aspects, the process 500 includes identifying a reporting period based at least in part on a QoS level associated with the sidelink communication. In an eighth aspect, alone or in combination with one or more of the first to seventh aspects, the QoS level associated with the sidelink communication is based at least in part on a priority parameter associated with the sidelink communication, a latency parameter associated with the sidelink communication, or a combination of a priority parameter associated with the sidelink communication and a latency parameter associated with the sidelink communication.

[0089] In a ninth aspect, alone or in combination with one or more of the first to eighth aspects, transmitting one or more feedback communications within the reporting period includes transmitting one or more feedback communications on feedback report resources included in the reporting period. In a tenth aspect, alone or in combination with one or more of the first to ninth aspects, the one or more feedback communications include at least one of a HARQ communication transmitted on the PSFCH, a CSI feedback communication transmitted on another PSFCH, or a combination of a HARQ communication transmitted on the PSFCH and a CSI feedback communication transmitted on another PSFCH.

[0090] In an eleventh aspect, alone or in combination with one or more of the first to tenth aspects, the one or more feedback communications are multiplexed, together with one or more other feedback communications transmitted by another UE, into one or more symbols included in a reporting period, the reporting period occupying the entire bandwidth of a resource pool configured for the sidelink such that no other transmissions other than the one or more feedback communications and the one or more other feedback communications occur within the one or more symbols.

[0091] In a twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, the one or more feedback communications include a HARQ communication transmitted on a PSFCH and a CSI feedback communication transmitted on another PSFCH, the HARQ communication and the CSI feedback communication being time division multiplexed within a reporting period. In a thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, the one or more feedback communications include a HARQ communication transmitted on a PSFCH and a CSI feedback communication transmitted on another PSFCH, the HARQ communication and the CSI feedback communication being frequency division multiplexed within a reporting period.

[0092] In a fourteenth aspect, alone or in combination with one or more of the first through thirteenth aspects, the one or more feedback communications include a HARQ communication transmitted on a PSFCH and a CSI feedback communication transmitted on another PSFCH. In a fifteenth aspect, alone or in combination with one or more of the first through fourteenth aspects, the process 500 includes identifying a reporting period based at least in part on a periodicity of one or more slots in the multiple reporting periods for transmitting the HARQ communication and a periodicity of one or more slots in the multiple reporting periods for transmitting the CSI feedback communication.

[0093] In a sixteenth aspect, alone or in combination with one or more of the first to fifteenth aspects, the one or more feedback communications include a HARQ communication transmitted on a PSFCH. In a seventeenth aspect, alone or in combination with one or more of the first to sixteenth aspects, the process 500 includes transmitting a CSI feedback communication associated with the sidelink communication on another PSFCH in another reporting period. In an eighteenth aspect, alone or in combination with one or more of the first to seventeenth aspects, receiving a sidelink communication includes receiving a plurality of sidelink communications transmitted during a transmission period on the sidelink.

[0094] In a nineteenth aspect, alone or in combination with one or more of the first to eighteenth aspects, transmitting one or more feedback communications includes transmitting one or more feedback communications for a plurality of sidelink communications during a reporting period. In a twentieth aspect, alone or in combination with one or more of the first to nineteenth aspects, receiving a sidelink communication includes receiving a plurality of sidelink communications transmitted during a transmission period on the sidelink. In a twenty-first aspect, alone or in combination with one or more of the first to twentieth aspects, transmitting one or more feedback communications includes transmitting one or more feedback communications for a subset of the plurality of sidelink communications during a reporting period.

[0095] In a twenty-second aspect, alone or in combination with one or more of the first to twenty-first aspects, the reporting period includes a reporting period occupying an entire bandwidth of a resource pool configured for the sidelink, a UE-specific reporting period, or a reporting period configured for a set of UEs. In a twenty-third aspect, alone or in combination with one or more of the first to twenty-second aspects, the reporting period is included in multiple reporting periods configured for the sidelink. In a twenty-fourth aspect, alone or in combination with one or more of the first to twenty-third aspects, transmitting the one or more feedback communications within the reporting period includes transmitting the one or more feedback communications in one or more RBs of one or more symbols included in the reporting period, the one or more RBs being associated with a slot in which transmission of the sidelink communication has been completed.

[0096] 5 illustrates example blocks of process 500, in some aspects process 500 may include additional, fewer, different, or differently arranged blocks compared to the blocks illustrated in FIG 5. Additionally or alternatively, two or more of the blocks of process 500 may be performed in parallel.

[0097] 6 illustrates an example process 600 performed, for example, by a UE, in accordance with various aspects of the present disclosure. The example process 600 is an example of a UE (e.g., UE 120, UE 120a, UE 120e, etc.) performing operations associated with feedback of sidelink communications.

[0098] 6, in some aspects, the process 600 may include receiving a sidelink communication over a sidelink between the UE and another UE (block 610). For example, the UE may receive (e.g., using the receive processor 258, the transmit processor 264, the controller / processor 280, the memory 282, etc.) the sidelink communication over the sidelink between the UE and another UE, as described above.

[0099] 6, in some aspects, the process 600 may include transmitting, on the sidelink, one or more feedback communications associated with the sidelink communication within a reporting period configured to occupy an entire bandwidth of a resource pool configured for the sidelink (block 620). For example, the UE may (e.g., using the receive processor 258, the transmit processor 264, the controller / processor 280, the memory 282, etc.) transmit, on the sidelink, one or more feedback communications associated with the sidelink communication within a reporting period configured to occupy an entire bandwidth of a resource pool configured for the sidelink, as described above.

[0100] Process 600 may include additional aspects, such as any single aspect or any combination of aspects described below and / or with respect to one or more other processes described elsewhere herein.

[0101] In a first aspect, the reporting period is comprised of a period including one or more slots. In a second aspect, alone or in combination with the first aspect, each of the one or more feedback communications occupies a bandwidth that is less than the entire bandwidth. In a third aspect, alone or in combination with one or more of the first and second aspects, transmitting the one or more feedback communications within the reporting period includes transmitting the one or more feedback communications in one or more adjacent symbols included in the reporting period.

[0102] 6 illustrates example blocks of process 600, in some aspects process 600 may include additional, fewer, different, or differently arranged blocks compared to the blocks illustrated in FIG 6. Additionally or alternatively, two or more of the blocks of process 600 may be performed in parallel.

[0103] 7 illustrates an example process 700 performed, for example, by a UE, in accordance with various aspects of the present disclosure. The example process 700 is an example of a UE (e.g., UE 120, UE 120a, UE 120e, etc.) performing operations associated with feedback of sidelink communications.

[0104] 7, in some aspects, the process 700 may include transmitting a sidelink communication over a sidelink between the UE and another UE (block 710). For example, the UE may transmit (e.g., using the receive processor 258, the transmit processor 264, the controller / processor 280, the memory 282, etc.) a sidelink communication over a sidelink between the UE and another UE, as described above.

[0105] 7, in some aspects, the process 700 may include receiving, over the sidelink, one or more feedback communications associated with the sidelink communication within a reporting period having a configurable periodicity (block 720). For example, the UE may receive (e.g., using the receive processor 258, the transmit processor 264, the controller / processor 280, the memory 282, etc.) over the sidelink, one or more feedback communications associated with the sidelink communication within a reporting period having a configurable periodicity, as described above.

[0106] Process 700 may include additional aspects, such as any single aspect or any combination of aspects described below and / or with respect to one or more other processes described elsewhere herein.

[0107] In a first aspect, the reporting period is comprised of a multi-slot period. In a second aspect, alone or in combination with the first aspect, the process 700 includes identifying the reporting period based at least in part on a start slot of the reporting period being adjacent to a slot in which the sidelink communication transmission is completed. In a third aspect, alone or in combination with one or more of the first and second aspects, the process 700 includes identifying the reporting period based at least in part on the reporting period occurring at least a threshold amount of slots after the slot in which the sidelink communication transmission is completed.

[0108] In a fourth aspect, alone or in combination with one or more of the first through third aspects, receiving one or more feedback communications within the reporting period includes receiving one or more feedback communications at one or more symbols included in the reporting period. In a fifth aspect, alone or in combination with one or more of the first through fourth aspects, the one or more symbols are adjacent symbols, and the reporting period includes a first transmit / receive turnaround symbol adjacent to a first symbol of the one or more symbols and a second transmit / receive turnaround symbol adjacent to a second symbol of the one or more symbols.

[0109] In a sixth aspect, alone or in combination with one or more of the first through fifth aspects, the process 700 includes identifying a reporting period based at least in part on a processing capability of the other UE. In a seventh aspect, alone or in combination with one or more of the first through sixth aspects, the process 700 includes identifying a reporting period based at least in part on a QoS level associated with the sidelink communication.

[0110] 7 illustrates example blocks of process 700, in some aspects process 700 may include additional, fewer, different, or differently arranged blocks compared to the blocks illustrated in FIG 7. Additionally or alternatively, two or more of the blocks of process 700 may be performed in parallel.

[0111] 8 illustrates an example process 800 performed, for example, by a UE, in accordance with various aspects of the present disclosure. The example process 800 is an example of a UE (e.g., UE 120, UE 120a, UE 120e, etc.) performing operations associated with feedback of sidelink communications.

[0112] 8, in some aspects, the process 800 may include transmitting a sidelink communication over a sidelink between the UE and another UE (block 810). For example, the UE may transmit (e.g., using the receive processor 258, the transmit processor 264, the controller / processor 280, the memory 282, etc.) a sidelink communication over a sidelink between the UE and another UE, as described above.

[0113] 8, in some aspects, the process 800 may include receiving, on the sidelink, one or more feedback communications associated with the sidelink communication within a reporting period configured to occupy an entire bandwidth of a resource pool configured for the sidelink (block 820). For example, the UE may receive (e.g., using the receive processor 258, the transmit processor 264, the controller / processor 280, the memory 282, etc.) one or more feedback communications associated with the sidelink communication within a reporting period configured to occupy an entire bandwidth of a resource pool configured for the sidelink, as described above.

[0114] Process 800 may include additional aspects, such as any single aspect or any combination of aspects described below and / or with respect to one or more other processes described elsewhere herein.

[0115] In a first aspect, the reporting period is comprised of a period including one or more slots. In a second aspect, alone or in combination with the first aspect, each of the one or more feedback communications occupies less than the entire bandwidth. In a third aspect, alone or in combination with one or more of the first and second aspects, receiving one or more feedback communications within the reporting period includes receiving one or more feedback communications in one or more adjacent symbols included in the reporting period.

[0116] 8 illustrates example blocks of process 800, in some aspects process 800 may include additional, fewer, different, or differently arranged blocks compared to the blocks illustrated in FIG 8. Additionally or alternatively, two or more of the blocks of process 800 may be performed in parallel.

[0117] The above disclosure provides illustration and description, and is not intended to be exhaustive or to limit the embodiments to the precise form disclosed. Modifications and variations may be made in light of the above disclosure or may be acquired from practice of the embodiments.

[0118] A "component" as used herein is intended to be broadly interpreted as hardware, firmware, or a combination of hardware and software. A "processor" as used herein is implemented as hardware, firmware, or a combination of hardware and software.

[0119] It is apparent that the systems and / or methods described herein may be implemented in various forms of hardware, firmware, or a combination of hardware and software. The actual dedicated control hardware or software code used to implement these systems and / or methods is not limiting of the aspects. Thus, the operation and behavior of the systems and / or methods are described herein without reference to specific software code. It should be understood that software and hardware may be designed to implement the systems and / or methods based at least in part on the description herein.

[0120] Although certain combinations of features are recited in the claims and / or disclosed herein, these combinations do not limit the disclosure of the various aspects. In fact, many of these features may be combined in ways not specifically recited in the claims and / or disclosed herein. Although each dependent claim described below may depend directly on only one claim, the disclosure of the various aspects includes each dependent claim in combination with every other claim in the claim set. A phrase referring to "at least one" of a list of items refers to any combination of those items, including single members. By way of example, "at least one of a, b, or c" is intended to encompass a, b, c, ab, ac, bc, and abc, as well as any combination of multiple identical elements (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc, and ccc, or any other order of a, b, and c).

[0121] No element, act, or instruction used herein should be construed as critical or essential unless expressly described as such. Additionally, the articles "a" and "an" as used herein are intended to include one or more items and may be used interchangeably with "one or more." Additionally, the terms "set" and "group" as used herein are intended to include one or more items (e.g., related items, unrelated items, combinations of related and unrelated items, etc.) and may be used interchangeably with "one or more." When only one item is intended, the phrase "only one" or similar language is used. Additionally, terms such as "has," "have," and "having" as used herein are intended to be open-ended terms. Additionally, the phrase "based on" is intended to mean "based at least in part on," unless otherwise specified. [Explanation of symbols]

[0122] 100 Wireless Network 102a Macro Cell 102b Picocell 102c Femtocell 110BS 110d relay station 120UE 130 Network Controller 140 Communications Manager 200 designs 212 Data Source 220 Transmit Processor 230 Transmit (TX) Multiple Input Multiple Output (MIMO) Processor 232a~232t Modulator (MOD) 234a~234t Antenna 236 MIMO Detector 238 Receive Processor 239 Data Sink 240 Controllers / Processors 242 Memory 244 Communication Unit 246 Scheduler 252a~252r Antenna 254a~254r Demodulator (DEMOD) 256 MIMO detector 258 Receive Processor 260 Data Sink 262 Data Sources 264 Transmit Processor 236 MIMO Detector 280 Controller / Processor 282 Memory 290 Controller / Processor 292 Memory 294 Communication Unit 300 Frame Structure 400 Frame Structure 500 processes 600 processes 700 processes 800 processes

Claims

1. An apparatus for wireless communication in a user equipment (UE), comprising: one or more memories; and one or more processors coupled to the one or more memories, the one or more processors causing the UE to: receiving a sidelink communication over a sidelink between the UE and another UE; configured to cause transmission, on the sidelink, of one or more feedback communications associated with the sidelink communication in a feedback report resource comprising one or more symbols; The one or more symbols are located at the end of a particular slot among a plurality of slots included in a feedback reporting period.

2. The apparatus described in claim 1, wherein the particular slot is the last slot included in the feedback reporting period.

3. The apparatus of claim 1, wherein the one or more symbols include a plurality of symbols.

4. The plurality of symbols are present in the particular slot, The apparatus of claim 3 , wherein the particular slot is the last slot included in the feedback reporting period.

5. The plurality of symbols are located at the end of the particular slot, The apparatus of claim 3 , wherein the particular slot is the last slot included in the feedback reporting period.

6. The one or more processors, in the UE, 10. The apparatus of claim 1, further configured to identify the feedback reporting resource from a plurality of feedback reporting resources for the sidelink.

7. The method of claim 1, further comprising: causing the UE to identify the feedback report resource.

7. The apparatus of claim 6, configured to identify the feedback reporting resource based at least in part on occurring at least a threshold amount of slots after a last slot of the sidelink communication.

8. The apparatus of claim 1, wherein the one or more feedback communications are transmitted on a physical sidelink feedback channel (PSFCH) associated with the feedback reporting resource.

9. The apparatus of claim 1, wherein the one or more feedback communications include a hybrid automatic repeat request (HARQ) communication transmitted on a physical sidelink feedback channel (PSFCH).

10. The method of claim 1, further comprising: causing the UE to transmit the one or more feedback communications on the feedback report resource. The apparatus of claim 1 , configured to cause the one or more feedback communications to be transmitted in the one or more symbols.

11. To cause the UE to transmit the one or more feedback communications on the feedback report resource, the one or more processors are configured to:

10. The apparatus of claim 1, configured to cause the one or more feedback communications to be transmitted in one or more resource blocks (RBs) of the one or more symbols.

12. A method of wireless communication performed in a user equipment (UE), comprising: receiving a sidelink communication over a sidelink between the UE and another UE; and transmitting, on the sidelink, one or more feedback communications associated with the sidelink communication in a feedback reporting resource comprising one or more symbols; The one or more symbols are located at the end of a particular slot among a plurality of slots included in a feedback reporting period.

13. The method of claim 12, wherein the particular slot is the last slot included in the feedback reporting period.

14. The method of claim 12, wherein the one or more symbols include a plurality of symbols.

15. The method of claim 14, wherein the plurality of symbols are present in the particular slot, The method of claim 14 , wherein the particular slot is the last slot included in the feedback reporting period.

16. The method of claim 15, wherein the plurality of symbols are located at the end of the particular slot, The method of claim 14 , wherein the particular slot is the last slot included in the feedback reporting period.

17. The method of claim 12, further comprising identifying the feedback report resource from a plurality of feedback report resources for the sidelink.

18. The method of claim 17, further comprising:

20. The method of claim 17, comprising identifying the feedback reporting resource based at least in part on occurring at least a threshold amount of slots after a last slot of the sidelink communication.

19. The method of claim 12, wherein the one or more feedback communications are transmitted on a physical sidelink feedback channel (PSFCH) associated with the feedback reporting resource.

20. The method of claim 12, wherein the one or more feedback communications include a hybrid automatic repeat request (HARQ) communication transmitted on a physical sidelink feedback channel (PSFCH).

21. The step of transmitting the one or more feedback communications on the feedback report resource, comprising: The method of claim 12 , comprising transmitting the one or more feedback communications in the one or more symbols.

22. The method of claim 21, wherein the step of transmitting the one or more feedback communications on the feedback report resource comprises:

13. The method of claim 12, comprising transmitting the one or more feedback communications in one or more resource blocks (RBs) of the one or more symbols.

23. A non-transitory computer-readable medium having stored thereon a set of instructions for wireless communication, the set of instructions comprising: When executed by one or more processors of a user equipment (UE), the UE is caused to: receiving a sidelink communication over a sidelink between the UE and another UE; and one or more instructions for causing transmission, over the sidelink, of one or more feedback communications associated with the sidelink communication in a feedback reporting resource comprising one or more symbols. The one or more symbols are located at the end of a particular slot among a plurality of slots included in a feedback reporting period.

24. The non-transitory computer-readable medium of claim 23, wherein the particular slot is the last slot included in the feedback reporting period.

25. The non-transitory computer-readable medium of claim 23, wherein the one or more symbols include a plurality of symbols.

26. The plurality of symbols are present in the particular slot, 26. The non-transitory computer-readable medium of claim 25, wherein the particular slot is the last slot included in the feedback reporting period.

27. The plurality of symbols are located at the end of the particular slot, 26. The non-transitory computer-readable medium of claim 25, wherein the particular slot is the last slot included in the feedback reporting period.

28. An apparatus for wireless communication, comprising: means for receiving sidelink communications over a sidelink between the device and another device; and means for transmitting, on the sidelink, one or more feedback communications associated with the sidelink communication in a feedback report resource comprising one or more symbols; The one or more symbols are located at the end of a particular slot among a plurality of slots included in a feedback reporting period.

29. The apparatus of claim 28, wherein the particular slot is the last slot included in the feedback reporting period.

30. The apparatus of claim 28, wherein the one or more symbols include a plurality of symbols.

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