Fast feedback for sidelink channels

Abstract

Aspects of the disclosure relate generally to wireless communication. In some aspects, a first user equipment (UE) can receive, from a second UE, an indicator of a status of a sidelink channel on the sidelink channel. The first UE can therefore transmit, to a base station, a request for additional resources for the sidelink channel based at least in part on determining that the indicator of the status of the sidelink channel satisfies a condition. For example, the first UE can determine that a modulation and coding scheme (MCS) supported by current resources of the sidelink channel is outside a range of MCSs authorized by the base station. In some aspects, the request can comprise a negative acknowledgement (NACK) signal, and the first UE can further transmit a scheduling request used to transmit the indicator of the status of the sidelink channel. A number of other aspects are provided.

Description

[0001] Cross-references of related applications

[0002] This patent application claims priority to U.S. Provisional Patent Application No. 63 / 036,326, filed June 8, 2020, entitled "Fast Feedback for Sidelink Channel" and U.S. Non-Provisional Patent Application No. 17 / 322,080, filed May 17, 2021, entitled "Fast Feedback for Sidelink Channel", which are expressly incorporated herein by reference. Technical Field

[0003] This disclosure generally relates to wireless communication and techniques and apparatus for transmitting and receiving fast feedback for sidelink channels. Background Technology

[0004] Wireless communication systems are widely deployed to provide a variety of telecommunications services, such as telephone, video, data, messaging, and broadcasting. Typical wireless communication systems employ multiple access technologies that enable 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 an enhancement set of the Universal Mobile Telecommunications System (UMTS) mobile standard released by the 3rd Generation Partnership Project (3GPP).

[0005] A wireless network may include multiple base stations (BSs) capable of supporting communication for multiple user equipments (UEs). UEs can communicate with the BS via downlink and uplink. A "downlink" (or forward link) refers to the communication link from the BS to the UE, and an "uplink" (or reverse link) refers to the communication link from the UE to the BS. As will be described in more detail herein, a BS may be referred to as a Node B, gNB, Access Point (AP), Radio Head, Transmit / Receive Point (TRP), New Radio (NR) BS, 5G Node B, etc.

[0006] Various telecommunications standards employ the aforementioned access technologies to provide a common protocol, enabling different user equipment to communicate at the city, national, regional, and even global levels. NR (also known as 5G) is an enhancement set of the LTE mobile standard released by 3GPP. NR is designed to better support mobile broadband internet access by improving spectrum efficiency, reducing costs, improving service, utilizing new spectrum, and better integrating with other open standards (which utilize Orthogonal Frequency Division Multiplexing (OFDM) with a Cyclic Prefix (CP) on the downlink (DL) and CP-OFDM and / or SC-FDM (also known as Discrete Fourier Transform Extended OFDM (DFT-s-OFDM)) on the uplink (UL), as well as supporting beamforming, multiple-input multiple-output (MIMO) antenna technologies, and carrier aggregation. Further improvements to LTE, NR, and other radio access technologies remain useful as the demand for mobile broadband access continues to increase. Summary of the Invention

[0007] In some aspects, a method of wireless communication performed by a first user equipment (UE) includes: receiving a state indicator of a sidelink channel from a second UE on a sidelink channel; and sending a request for additional resources for the sidelink channel to a base station based at least in part on determining that the state indicator of the sidelink channel meets certain conditions.

[0008] In some aspects, a method of wireless communication performed by a base station includes sending an authorization to a UE for one or more resources to be used on a sidelink channel; and receiving, at least in part, a request from the UE for additional resources for the sidelink channel based on the authorization to send one or more resources.

[0009] In some aspects, a non-transitory computer-readable medium storing a set of instructions for wireless communication includes: one or more instructions, when executed by one or more processors of a first UE, causing the first UE to receive a status indicator of a sidelink channel from a second UE on the sidelink channel; and sending a request for additional resources for the sidelink channel to a base station based at least in part on determining that the status indicator of the sidelink channel satisfies a condition.

[0010] In some aspects, a non-transitory computer-readable medium storing a set of instructions for wireless communication includes: one or more instructions, when executed by one or more processors of a base station, causing the base station to send an authorization to a UE for one or more resources to be used on a sidelink channel; and receiving, at least in part, a request from the UE for additional resources for the sidelink channel based on the authorization to send the one or more resources.

[0011] In some aspects, a first UE for wireless communication includes a memory and one or more processors coupled to the memory, the memory and the one or more processors being configured to receive a sidelink channel status indicator from a second UE on a sidelink channel; and to send a request for additional resources for the sidelink channel to a base station based at least in part on determining that the sidelink channel status indicator satisfies a condition.

[0012] In some aspects, a base station for wireless communication includes a memory and one or more processors coupled to the memory, the memory and the one or more processors being configured to send an authorization to a UE for use of one or more resources on a sidelink channel; and to receive a request from the UE for additional resources for the sidelink channel based at least in part on the authorization to send the one or more resources.

[0013] In some aspects, an apparatus for wireless communication includes components for receiving a state indicator of a sidelink channel from a UE on a sidelink channel; and components for sending a request for additional resources for the sidelink channel to a base station based at least in part on determining that the state indicator of the sidelink channel satisfies a condition.

[0014] In some aspects, an apparatus for wireless communication includes components for transmitting to a UE an authorization for one or more resources to be used on a sidelink channel; and components for receiving from the UE a request for additional resources on the sidelink channel based at least in part on the authorization for transmitting one or more resources.

[0015] The terms generally include, as described herein with reference to the accompanying drawings and description, methods, apparatuses, systems, computer program products, non-transitory computer-readable media, user equipment, base stations, wireless communication devices and / or processing systems.

[0016] The features and technical advantages of examples according to this disclosure have been outlined rather extensively above to facilitate a better understanding of the following detailed description. Other features and advantages will be described below. The disclosed concepts and specific examples can be readily used as the basis for modifying or designing other structures to achieve the same purpose of this disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The features, organization, and operation of the concepts disclosed herein, as well as their associated advantages, will be better understood from the following description when considered in conjunction with the accompanying drawings. Each drawing is provided for illustrative and explanatory purposes and not as a definition of the limits of the claims.

[0017] While aspects have been described in this disclosure by way of example, those skilled in the art will understand that these aspects can be implemented in many different arrangements and scenarios. The techniques described herein can be implemented using different platform types, devices, systems, shapes, sizes, and / or packaging arrangements. For example, some aspects can be implemented via integrated chip embodiments or other modular component-based devices (e.g., end-user devices, vehicles, communication devices, computing devices, industrial equipment, retail / purchasing devices, medical devices, or devices with artificial intelligence capabilities). Aspects can be implemented in chip-level components, modular components, non-modular components, non-chip-level components, device-level components, or system-level components. Devices incorporating the aspects and features may include additional components and features for implementing and practicing the claimed and described aspects. For example, the transmission and reception of wireless signals may include multiple components for analog and digital purposes (e.g., including antennas, radio frequency (RF) chains, power amplifiers, modulators, buffers, processors, interleavers, adders, or hardware components of adders). It is intended that the aspects described herein can be practiced in devices, components, systems, distributed arrangements, or end-user devices of various sizes, shapes, and configurations. Attached Figure Description

[0018] To gain a more detailed understanding of the foregoing features of this disclosure, reference can be made to several aspects for a more specific description, some of which are illustrated in the accompanying drawings. However, it should be noted that the drawings illustrate only certain typical aspects of this disclosure and are therefore not intended to limit its scope, as the description may allow for other equally valid aspects. The same reference numerals in different figures may identify the same or similar elements.

[0019] Figure 1 This is a diagram illustrating an example of a wireless network according to this disclosure.

[0020] Figure 2 This is a diagram illustrating an example of communication between a base station and a user equipment (UE) in a wireless network according to this disclosure.

[0021] Figure 3 This is a diagram illustrating an example of sidelink communication according to this disclosure.

[0022] Figure 4 This is a diagram illustrating examples of sidelink communication and access link communication according to this disclosure.

[0023] Figure 5 This is a diagram illustrating an example of fast feedback for a sidelink channel according to this disclosure.

[0024] Figure 6 This is a diagram illustrating an example process performed by the UE according to this disclosure.

[0025] Figure 7 This is a diagram illustrating an example process performed by a base station according to this disclosure.

[0026] Specific implementation method

[0027] Various aspects of this disclosure are described more fully below with reference to the accompanying drawings. However, this disclosure may be embodied in many different forms and should not be construed as limited to any particular structure or function presented herein. Rather, these aspects are provided so that this disclosure will be thorough and complete, and will fully convey the scope of this disclosure to those skilled in the art. Based on the teachings herein, those skilled in the art will understand that the scope of this disclosure is intended to cover any aspect disclosed herein, whether implemented independently of or in combination with any other aspect of this disclosure. For example, any number of aspects set forth herein may be used to implement an apparatus or method of practice. Furthermore, the scope of this disclosure is intended to cover such an apparatus or method practiced using structures, functions, or structures and functions other than those set forth herein. It should be understood that any aspect disclosed herein may be implemented by one or more elements of the claims.

[0028] Several aspects of a telecommunications system will now be introduced with reference to various devices and technologies. These devices and technologies will be described in detail below and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively, “elements”). These elements can be implemented using hardware, software, or a combination thereof. Whether these elements are implemented in hardware or software depends on the specific application and design constraints imposed on the overall system.

[0029] It should be noted that although the terms commonly associated with 5G or NR radio access technology (RAT) may be used to describe the aspects herein, the aspects of this disclosure may be applied to other RATs, such as 3G RAT, 4G RAT and / or RATs after 5G (e.g., 6G).

[0030] Figure 1 This is a diagram illustrating an example of a wireless network 100 according to this disclosure. Wireless network 100 may be or may include elements of a 5G (NR) network and / or an LTE network, etc. Wireless network 100 may include multiple base stations 110 (shown as BS 110a, BS 110b, BS 110c, and BS 110d) and other network entities. A base station (BS) is an entity that communicates with user equipment (UE) and may also be referred to as an NR BS, Node B, gNB, 5G Node B (NB), access point, Transmit / Receive Point (TRP), etc. Each BS provides communication coverage for a specific geographic area. In 3GPP, the term "cell" may refer to the BS subsystem serving that coverage area and / or the coverage area of ​​the BS subsystem, depending on the context in which the term is used.

[0031] A BS can provide communication coverage for macrocells, picocells, femtocells, and / or other types of cells. A macrocell can cover a relatively large geographic area (e.g., several kilometers in radius) and can allow unrestricted access for UEs with service subscriptions. A picocell can cover a relatively small geographic area and can allow unrestricted access for UEs with service subscriptions. A femtocell can cover a relatively small geographic area (e.g., a home) and can allow restricted access for UEs associated with the femtocell (e.g., UEs in a Closed Subscriber Group (CSG)). A BS for a macrocell can be called a macro BS. A BS for a picocell can be called a pico BS. A BS for a femtocell can be called a femto BS or a home BS. Figure 1 In the example shown, BS 110a can be a macro BS of macro cell 102a, BS 110b can be a pico BS of pico cell 102b, and BS 110c can be a femto BS of femto cell 102c. A BS can support one or more (e.g., three) cells. The terms “eNB,” “base station,” “NR BS,” “gNB,” “TRP,” “AP,” “Node B,” “5G NB,” and “cell” are used interchangeably here.

[0032] In some respects, the cell need not be stationary, and the geographical area of ​​the cell can move depending on the location of the mobile BS. In some respects, any suitable transport network can be used to interconnect BSs with each other and / or interconnect them with one or more other BSs or network nodes (not shown) in the wireless network 100 via various types of backhaul interfaces (such as direct physical connections or virtual networks).

[0033] The wireless network 100 may also include relay stations. A relay station is an entity that can receive data transmissions from an upstream station (e.g., a BS or a UE) and transmit data transmissions to a downstream station (e.g., a UE or a BS). A relay station can also be a UE that can relay transmissions for other UEs. Figure 1 In the example shown, relay BS 110d can communicate with macro BS 110a and UE 120d to facilitate communication between BS110a and UE 120d. A relay BS can also be called a relay station, relay base station, relay, etc.

[0034] Wireless network 100 can be a heterogeneous network comprising different types of Base Stations (BSs), such as macro BSs, pico BSs, femto BSs, and repeater BSs. These different types of BSs can have different transmit power levels, different coverage areas, and different effects on interference in wireless network 100. For example, macro BSs can have high transmit power levels (e.g., 5 to 40 watts), while pico BSs, femto BSs, and repeater BSs can have lower transmit power levels (e.g., 0.1 to 2 watts).

[0035] Network controller 130 can be coupled to a group of base stations (BSs) and can provide coordination and control for these BSs. Network controller 130 can communicate with the BSs via backhaul. The BSs can also communicate with each other directly or indirectly, for example, via wireless or wired backhaul.

[0036] UEs 120 (e.g., 120a, 120b, 120c) may be distributed throughout the wireless network 100, and each UE may be stationary or mobile. UEs may also be referred to as access terminals, terminals, mobile stations, user units, stations, etc. UEs may be cellular phones (e.g., smartphones), personal digital assistants (PDAs), wireless modems, wireless communication devices, handheld devices, laptops, cordless phones, wireless local loop (WLL) stations, tablets, cameras, gaming devices, netbooks, smartbooks, ultrabooks, medical devices or equipment, biometric sensors / devices, wearable devices (smartwatches, smart clothing, smart glasses, smart wristbands, smart jewelry (e.g., smart rings, smart bracelets)), entertainment devices (e.g., music or video devices, or satellite radios), vehicle components or sensors, smart meters / sensors, industrial manufacturing equipment, GPS devices, or any other suitable device configured to communicate via wireless or wired media.

[0037] Some UEs may be considered Machine-Type Communication (MTC) or Evolved or Enhanced Machine-Type Communication (eMTC) UEs. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, and / or location tags that can communicate with a base station, another device (e.g., a remote device), or some other entity. Wireless nodes may provide connectivity to or to a network (e.g., a wide area network such as the Internet or cellular networks) via wired or wireless communication links, for example. Some UEs may be considered Internet of Things (IoT) devices and / or may be implemented as NB-IoT (Narrowband Internet of Things) devices. Some UEs may be considered Customer Premises Equipment (CPE). UE 120 may be included within a housing housing components (such as processor components and / or memory components) of UE 120. In some aspects, the processor components and memory components may be coupled together. For example, the processor components (e.g., one or more processors) and memory components (e.g., memory) may be operatively coupled, communicatively coupled, electronically coupled, and / or electrically coupled.

[0038] Generally, any number of wireless networks can be deployed in a given geographical area. Each wireless network can support a specific RAT and can operate on one or more frequencies. A RAT can also be referred to as a radio technology, air interface, etc. A frequency can also be referred to as a carrier, frequency channel, etc. Each frequency can support a single RAT in a given geographical area to avoid interference between wireless networks using different RATs. In some cases, NR or 5G RAT networks may be deployed.

[0039] In some respects, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly using one or more sidelink channels (e.g., without using base station 110 as an intermediary for communication). For example, UE 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocols (e.g., which may include vehicle-to-vehicle (V2V) protocols or vehicle-to-infrastructure (V2I) protocols) and / or mesh networks. In this case, UE 120 may perform scheduling operations, resource selection operations, and / or other operations described elsewhere herein as being performed by base station 110.

[0040] Devices in the wireless network 100 can communicate using the electromagnetic spectrum, which can be subdivided into various categories, bands, channels, etc., based on frequency or wavelength. For example, devices in the wireless network 100 can communicate using an operating band with a first frequency range (FR1) and / or an operating band with a second frequency range (FR2), where the first frequency range (FR1) can span from 410 MHz to 7.125 GHz and the second frequency range (FR2) can span from 24.25 GHz to 52.6 GHz. The frequencies between FR1 and FR2 are sometimes referred to as intermediate frequency (IF) frequencies. Although a portion of FR1 is greater than 6 GHz, FR1 is often referred to as the “sub-6 GHz” band. Similarly, FR2 is often referred to as the “millimeter wave” band, although it is different from the Extremely High Frequency (EHF) band (30 GHz–300 GHz) recognized as a “millimeter wave” band by the International Telecommunication Union (ITU). Therefore, unless otherwise specified, it should be understood that the terms "sub-6GHz," etc., if used herein, can broadly refer to frequencies less than 6GHz, frequencies within FR1, and / or intermediate frequency band frequencies (e.g., greater than 7.125GHz). Similarly, unless otherwise specified, it should be understood that the terms "millimeter wave," etc., if used herein, can broadly represent frequencies within the EHF band, frequencies within FR2, and / or intermediate frequency band frequencies (e.g., less than 24.25GHz). It is conceivable that the frequencies included in FR1 and FR2 can be modified, and the techniques described herein can be applied to those modified frequency ranges.

[0041] As mentioned above, providing Figure 1 As an example. Other examples may differ from those regarding... Figure 1 As described.

[0042] Figure 2 This is a diagram illustrating an example 200 of communication between a base station 110 and a UE 120 in a wireless network 100 according to the present disclosure. The base station 110 may be equipped with T antennas 234a to 234t, and the UE 120 may be equipped with R antennas 252a to 252r, wherein typically T ≥ 1 and R ≥ 1.

[0043] At base station 110, transmit processor 220 can receive data for one or more UEs from data source 212, select one or more modulation and coding schemes (MCS) for each UE based at least in part on channel quality indicators (CQI) received from the UE, process (e.g., encode and modulate) the data for each UE based at least in part on the selected MCS(s) for the UE, and provide data symbols for all UEs. Transmit processor 220 can also process system information (e.g., for semi-static resource allocation information (SRPI)) and control information (e.g., CQI requests, grants, and / or upper-layer signaling), and provide overhead symbols and control symbols. Transmit processor 220 can also generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS) or demodulation reference signals (DMRS)) and synchronization signals (e.g., primary synchronization signal (PSS) or secondary synchronization signal (SSS)). If applicable, the transmit (TX) multiple-input multiple-output (MIMO) processor 230 can perform spatial processing (e.g., precoding) on ​​data symbols, control symbols, overhead symbols, and / or reference symbols, and can provide T output symbol streams to T modulators (MODs) 232a to 232t. Each modulator 232 can process its corresponding output symbol stream (e.g., for OFDM) to obtain an output sample stream. Each modulator 232 can further process (e.g., convert to analog, amplify, filter, and up-convert) the output sample stream to obtain a downlink signal. The T downlink signals from modulators 232a to 232t can be transmitted via T antennas 234a to 234t, respectively.

[0044] In UE 120, antennas 252a to 252r can receive downlink signals from base station 110 and / or other base stations, and can provide the received signals to demodulators (DEMODs) 254a to 254r respectively. Each demodulator 254 can adjust (e.g., filter, amplify, downconvert, and digitize) the received signal to obtain an input sample. Each demodulator 254 can further process the input sample (e.g., for OFDM) to obtain a received symbol. MIMO detector 256 can obtain the received symbols from all R demodulators 254a to 254r, perform MIMO detection on the received symbols, and provide the detected symbols, if applicable. Receive processor 258 can process (e.g., demodulate and decode) the detected symbols, provide the decoded data of UE 120 to data sink 260, and provide the decoded control information and system information to controller / processor 280. The term "controller / processor" can refer to one or more controllers, one or more processors, or a combination thereof. The channel processor can determine parameters such as the Received Reference Signal Power (RSRP), Received Signal Strength Indicator (RSSI), Received Reference Signal Quality (RSRQ), and / or CQI. In some respects, one or more components of the UE 120 may be included in the housing 284.

[0045] Network controller 130 may include communication unit 294, controller / processor 290, and memory 292. Network controller 130 may include one or more devices, such as those in a core network. Network controller 130 may communicate with base station 110 via communication unit 294.

[0046] Antennas (e.g., antennas 234a to 234t and / or antennas 252a to 252r) may include one or more antenna panels, antenna groups, antenna element sets, and / or antenna arrays, or may be included within one or more antenna panels, antenna groups, antenna element sets, and / or antenna arrays. Antenna panels, antenna groups, sets of antenna elements, and / or antenna arrays may include one or more antenna elements. Antenna panels, antenna groups, sets of antenna elements, and / or antenna arrays may include a set of coplanar antenna elements and / or a set of non-coplanar antenna elements. Antenna panels, antenna groups, sets of antenna elements, and / or antenna arrays may include antenna elements within a single housing and / or multiple antenna elements within housings. Antenna panels, antenna groups, sets of antenna elements, and / or antenna arrays may include antenna elements coupled to one or more transmitting and / or receiving components (e.g., Figure 2 One or more antenna elements (one or more components).

[0047] On the uplink, in UE 120, the transmit processor 264 can receive and process data from data source 262, as well as control information from controller / processor 280 (e.g., for reporting including RSRP, RSSI, RSRQ, and / or CQI). The transmit processor 264 can also generate reference symbols for one or more reference signals. If applicable, the symbols from the transmit processor 264 can be pre-coded by TX MIMO processor 266, further processed by modulators 254a to 254r (e.g., for DFT-s-OFDM or CP-OFDM), and transmitted to base station 110. In some aspects, the modulator and demodulator (e.g., MOD / DEMOD 254) of UE 120 can be included in the modem of UE 120. In some aspects, UE 120 includes a transceiver. The transceiver may include any combination of antenna 252, modulator and / or demodulator 254, MIMO detector 256, receive processor 258, transmit processor 264, and / or TX MIMO processor 266. The transceiver may be used by a processor (e.g., controller / processor 280) and memory 282 to perform the functions described herein (e.g., references). Figure 5-7 Any aspect of any method.

[0048] At base station 110, uplink signals from UE 120 and other UEs can be received by antenna 234, processed by demodulator 232, detected by MIMO detector 236 (if applicable), and further processed by receiver processor 238 to obtain decoded data and control information transmitted by UE 120. Receiver processor 238 can provide decoded data to data sink 239 and decoded control information to controller / processor 240. Base station 110 may include communication unit 244 and communicate with network controller 130 via communication unit 244. Base station 110 may include scheduler 246 to schedule UE 120 for downlink and / or uplink communication. In some aspects, modulators and demodulators (e.g., MOD / DEMOD 232) of base station 110 may be included in the modem of base station 110. In some aspects, base station 110 includes transceivers. The transceiver may include any combination of antenna 234, modulator and / or demodulator 232, MIMO detector 236, receive processor 238, transmit processor 220, and / or TX MIMO processor 230. The transceiver may be used by a processor (e.g., controller / processor 240) and memory 242 to perform the functions described herein (e.g., references). Figure 5-7 Any aspect of any method.

[0049] The controller / processor 240 of base station 110, the controller / processor 280 of UE 120 and / or Figure 2Any other components may perform one or more techniques associated with rapid feedback of the transmit and receive side link channels, as described in more detail elsewhere herein. For example, the controller / processor 240 of base station 110, the controller / processor 280 of UE 120, and / or Figure 2 Any other component can perform or direct, for example Figure 6 Process 600 Figure 7 The operation of process 700 and / or other processes described herein. Memory 242 and 282 may store data and program code for base station 110 and UE 120, respectively. In some aspects, memory 242 and / or memory 282 may include a non-transitory computer-readable medium storing one or more instructions (e.g., code and / or program code) for wireless communication. For example, when executed by one or more processors of base station 110 and / or UE 120 (e.g., directly executed or after compilation, transformation, and / or interpretation), the one or more instructions may cause one or more processors, UE 120, and / or base station 110 to perform or direct, for example... Figure 6 Process 600 Figure 7 The process 700 and / or other processing operations described herein. In some aspects, the execution instructions may include run instructions, conversion instructions, editing instructions, and / or interpretation instructions, etc.

[0050] In some aspects, the first UE (e.g., UE 120a) may include components for receiving a sidelink channel status indicator from the second UE (e.g., UE 120e) on the sidelink channel; and / or components for sending a request for additional resources for the sidelink channel to the base station based at least in part on determining that the sidelink channel status indicator satisfies a condition. In some aspects, such components may include combinations of Figure 2 One or more components of the described UE 120, such as controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, or memory 282.

[0051] In some aspects, a base station (e.g., base station 110) may include components for transmitting to a UE (e.g., UE 120a) an authorization for one or more resources used on a sidelink channel; and / or components for receiving from the UE a request for additional resources on the sidelink channel, at least in part based on the authorization for transmitting one or more resources. In some aspects, such components may include combinations of... Figure 2One or more components of the described base station 110, such as antenna 234, DEMOD 232, MIMO detector 236, receive processor 238, controller / processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234, memory 242, or scheduler 246.

[0052] Although Figure 2 The blocks are illustrated as different components, but the functions described above for the blocks can be implemented in a single hardware, software, or combined component, or in various combinations of components. For example, the functions described with respect to the transmit processor 264, receive processor 258, and / or TX MIMO processor 266 can be performed by the controller / processor 280 or under the control of the controller / processor 280.

[0053] As mentioned above, Figure 2 For example. Other examples may be related to... Figure 2 The descriptions are different.

[0054] Figure 3 This is a diagram illustrating example 300 of sidelink communication according to this disclosure. Figure 3 As shown, the first UE 305-1 can communicate with the second UE 305-2 (and one or more other UEs 305) via one or more sidelink channels 310. UEs 305-1 and 305-2 can communicate using one or more sidelink channels 310 for P2P communication, D2D communication, V2X communication (e.g., which may include V2V communication, V2I communication, and / or vehicle-to-pedestrian (V2P) communication), and / or mesh networking. In some aspects, UEs 305 (e.g., UEs 305-1 and / or UEs 305-2) can correspond to one or more other UEs described elsewhere herein, such as UE 120. In some aspects, one or more sidelink channels 310 can use a PC5 interface and / or can operate in a high-frequency band (e.g., the 5.9 GHz band). Additionally or alternatively, UEs 305 can use Global Navigation Satellite System (GNSS) timing to synchronize the timing of transmission time intervals (TTIs) (e.g., frames, subframes, time slots, or symbols).

[0055] like Figure 3As further shown, one or more sidelink channels 310 may include a Physical Sidelink Control Channel (PSCCH) 315, a Physical Sidelink Shared Channel (PSSCH) 320, and / or a Physical Sidelink Feedback Channel (PSFCH) 325. PSCCH 315 may be used to transmit control information, similar to a Physical Downlink Control Channel (PDCCH) and / or a Physical Uplink Control Channel (PUCCH) for cellular communication with base station 110 via an access link or access channel. PSSCH 320 may be used to transmit data, similar to a Physical Downlink Shared Channel (PDSCH) and / or a Physical Uplink Shared Channel (PUSCH) for cellular communication with base station 110 via an access link or access channel. For example, PSCCH 315 may carry sidelink control information (SCI) 330, which may specify various control information for sidelink communication, such as one or more resources (e.g., time resources, frequency resources, and / or spatial resources), on which a transport block (TB) 335 may be carried on PSSCH 320. TB 335 may include data. PSFCH 325 can be used for transmission side link feedback 340, such as hybrid automatic repeat request (HARQ) feedback (e.g., acknowledgment or negative acknowledgment (ACK / NACK) information), transmit power control (TPC) and / or scheduling request (SR).

[0056] In some aspects, one or more sidelink channels 310 may use resource pools. For example, a specific resource block (RB) may be used to transmit a scheduling allocation across time in a subchannel (e.g., included in SCI 330). In some aspects, data transmissions associated with a scheduling allocation (e.g., on PSSCH 320) may occupy adjacent RBs in the same subframe as the scheduling allocation (e.g., using frequency division multiplexing). In some aspects, the scheduling allocation and associated data transmissions are not transmitted on adjacent RBs.

[0057] In some aspects, UE 305 may operate using a transmission mode in which resource selection and / or scheduling is performed by UE 305 (e.g., not base station 110). In some aspects, UE 305 may perform resource selection and / or scheduling by sensing the availability of channels for transmission. For example, UE 305 may measure RSSI parameters (e.g., sidelink-RSSI (S-RSSI) parameters) associated with various sidelink channels, may measure RSRP parameters (e.g., PSSCH-RSRP parameters) associated with various sidelink channels, and / or may measure RSRQ parameters (e.g., PSSCH-RSRQ parameters) associated with various sidelink channels, and may select channels for transmitting sidelink communication based at least in part on these measurements.

[0058] Alternatively, UE 305 may use SCI 330 received in PSCCH 315 to perform resource selection and / or scheduling, which may specify the occupied resources and / or channel parameters. Alternatively, UE 305 may perform resource selection and / or scheduling by determining the Channel Busy Rate (CBR) associated with various sidelink channels, which can be used for rate control (e.g., by specifying the maximum number of resource blocks available to UE 305 for a particular set of subframes).

[0059] In transport modes where resource selection and / or scheduling are performed by UE 305, UE 305 can generate a sidelink grant and can send that grant in SCI 330. For example, a sidelink grant can specify one or more parameters (e.g., transport parameters) to be used for an upcoming sidelink transport, such as one or more resource blocks (e.g., for TB 335) to be used for an upcoming sidelink transport on PSSCH 320, one or more subframes to be used for the upcoming sidelink transport, and / or the MCS to be used for the upcoming sidelink transport. In some aspects, UE 305 can generate a sidelink grant that specifies one or more parameters for semi-persistent scheduling (SPS), such as the period of the sidelink transport. Additionally or alternatively, UE 305 can generate a sidelink grant for event-driven scheduling, such as a sidelink grant for on-demand sidelink messages.

[0060] As mentioned above, Figure 3 For example. Other examples may differ from those regarding... Figure 3 As described.

[0061] Figure 4 This is a diagram illustrating example 400 of sidelink communication and access link communication according to this disclosure. Figure 4 As shown, the transmitter (Tx) / receiver (Rx) UE 405 and the Rx / Tx UE 410 can communicate with each other via a side link, as described above. Figure 3 As described. Further, as shown, in some sidelink modes, base station 110 may communicate with Tx / Rx UE 405 via a first access link. Additionally or alternatively, in some sidelink modes, base station 110 may communicate with Rx / Tx UE 410 via a second access link. Tx / Rx UE 405 and / or Rx / Tx UE 410 may correspond to one or more UEs described elsewhere herein, such as... Figure 1UE 120. Therefore, the direct link between UE 120 (e.g., via the PC5 interface) can be referred to as a side link, and the direct link between base station 110 and UE 120 (e.g., via the Uu interface) can be referred to as an access link. Side link communication can be transmitted via the side link, and access link communication can be transmitted via the access link. Access link communication can be downlink communication (from base station 110 to UE 120) or uplink communication (from UE 120 to base station 110).

[0062] As mentioned above, Figure 4 For example. Other examples may differ from those regarding... Figure 4 As described.

[0063] In some cases, the base station may allocate one or more resources to the UE for use on the sidelink channel. However, there may be a difference between the state of the sidelink channel and the one or more resources allocated by the base station for the sidelink channel. For example, based at least in part on the state of the sidelink channel, the range of the MCS allocated by the base station may not allow for sidelink communication with reliability and / or quality that meets the threshold. Therefore, the UE may send data to at least one other UE on the sidelink channel even if at least one other UE is unlikely to receive and / or successfully decode the transmission. After the UE confirms that no transmission has been received (e.g., by receiving a NACK signal), the UE may report the failed transmission to the base station and request one or more new resources for the sidelink channel. However, this process wastes processing resources, network overhead, and battery power, and increases latency on the sidelink channel.

[0064] The techniques and apparatus described herein allow a UE (e.g., Tx UE 305-1) to provide feedback to a base station (e.g., base station 110) at least in part based on the difference between a state indicator of a sidelink channel (e.g., with another UE such as Rx UE 305-2) and the resources allocated by base station 110 for the sidelink channel. For example, a difference may occur based at least in part on the state of the sidelink channel when the range of the MCS allocated by base station 110 does not allow for sidelink communication with reliability and / or quality that meets a threshold. The techniques and apparatus described herein allow UE 305-1 to provide feedback without sending data on the sidelink channel to at least one other UE (e.g., Rx UE 305-2) and waiting for acknowledgment that at least one other UE has not received the transmission. Therefore, UE 305-1 can save processing and network resources by not sending data that is unlikely to be received and / or successfully decoded. In some aspects, UE 305-1 can also provide feedback before the scheduled PUCCH slot to reduce the waiting time between determining the difference and requesting one or more new resources from base station 110 for the sidelink channel.

[0065] Figure 5 This is a diagram illustrating example 500 of a fast feedback method for a sidelink channel according to this disclosure. Figure 5 As shown, Example 500 includes a base station 110 communicating with UE 305-1 (e.g., on the Uu interface) and (e.g., on the PC5 interface) on a sidelink channel (such as... Figure 3 UE 305-2 receives communication from UE 305-1 on one or more side link channels 310.

[0066] As shown in conjunction with reference numeral 505, base station 110 can transmit, and UE 305-1 can receive, authorizations for one or more resources used on the sidelink channel. For example, base station 110 can transmit configurations for the sidelink channel, such as indicators for one or more time slots on the sidelink channel, one or more sub-channels used on the sidelink channel, the range of the MCS used on the sidelink channel, and / or one or more other resources. In some aspects, authorizations may include Radio Resource Configuration (RRC) messages.

[0067] As shown in conjunction with reference numeral 510, UE 305-1 and UE 305-2 can perform a Channel State Indicator (CSI) procedure. For example, UE 305-1 can transmit and UE 305-2 can receive one or more CSI Reference Signals (CSI-RS) for measurement. In some aspects, UE 305-2 can transmit and UE 305-1 can receive a sidelink channel state indicator. For example, the sidelink channel state indicator can be based at least in part on measurements of the CSI-RS from UE 305-1.

[0068] In some aspects, the status indicator of the sidelink channel may include a CSI report generated by UE 305-2 (e.g., based at least in part on a measurement of CSIRS from UE 305-1 as described above). Alternatively or additionally, the status indicator of the sidelink channel may include one or more CQIs associated with the sidelink channel and calculated by UE 305-2 (e.g., based at least in part on a CSI-RS from UE 305-1 as described above).

[0069] As shown in conjunction with reference to figure 515, UE 305-1 can determine that the status indicator of the sidelink channel meets certain conditions. For example, UE 305-1 can determine that RSRP, signal-to-interference-plus-noise ratio (SINR), and / or another metric associated with the status of the sidelink channel meets a threshold, which may be included in or associated with the status indicator of the sidelink channel. In some aspects, such as Figure 5As shown, UE 3051 can determine the difference between the configuration of the sidelink channel (e.g., as described above with respect to reference numeral 505) and the status indicator of the sidelink channel.

[0070] Alternatively, UE 305-1 can determine the sidelink channel status indicator satisfaction condition by determining that the current resources for the sidelink channel do not allow sidelink communication with a reliability that meets a threshold. For example, when the MCS supported by the current resources is outside the range of the MCS authorized by base station 110 (e.g., as described above in conjunction with reference to figure 505), UE 305-1 can determine that the current resources do not allow sidelink communication with a reliability that meets a threshold.

[0071] As shown with reference to reference numeral 520, base station 110 can transmit downlink control information (DCI) for the sidelink channel, and UE 305-1 can receive downlink control information (DCI) for the sidelink channel. As further shown with reference to reference numeral 520, base station 110 can transmit and UE 305-1 can receive information intended for use by UE 305-2 and scheduled by DCI on the sidelink channel.

[0072] In some respects, UE 305-1 can suppress the transmission of information to UE 305-2. For example, UE 305-1 can suppress the transmission of information at least in part based on determining that the state indicator of the sidelink channel meets the conditions (e.g., as described above in conjunction with reference numeral 515). Thus, UE 305-1 can conserve network and processing resources (e.g., when UE 305-2 is unlikely to receive and / or successfully decode information on the sidelink channel).

[0073] As shown in conjunction with reference numeral 525, UE 305-1 can transmit, and base station 110 can receive, a request for additional resources for the sidelink channel. For example, UE 305-1 can transmit the request at least in part based on determining that a state indicator of the sidelink channel meets a condition (e.g., as described above in conjunction with reference numeral 515). In some aspects, the request transmitted by UE 305-1 can be used as feedback to base station 110 associated with the sidelink channel.

[0074] In some respects, UE 305-1 can send a request before the scheduled PUCCH slot with base station 110. For example, UE 305-1 can send the request earlier in time than the scheduled PUCCH slot. Therefore, UE 305-1 can send the request as a fast feedback associated with the sidelink channel to base station 110. Thus, UE 305-1 can reduce the waiting time between determining that the sidelink channel status indicator meets the conditions (e.g., as described above in conjunction with reference numeral 515) and receiving authorization for additional resources for the sidelink channel (e.g., as described below in conjunction with reference numeral 540).

[0075] Therefore, base station 110 may receive requests for additional resources for the opposite link channel from UE 305-1 at least in part based on authorization to transmit one or more resources (e.g., as described above in conjunction with reference numeral 505). Alternatively, base station 110 may receive requests for additional resources from UE 305-1 at least in part based on transmitting information intended for use by UE 305-2 (e.g., as described above in conjunction with reference numeral 520).

[0076] In some aspects, a request for additional resources for the sidelink channel may include a NACK signal. For example, UE 305-1 may send a NACK signal on the PUCCH. UE 305-1 may send a NACK signal even if UE 305-1 suppresses the transmission of information scheduled by the DCI to UE 3052 (e.g., as described above in conjunction with reference numeral 520). In some aspects, base station 110 may also receive an SR from UE 305-1 using a NACK, the SR being used to transmit a status indicator for the sidelink channel. For example, UE 305-1 may send an SR to receive uplink grants (e.g., as described below in conjunction with reference numeral 530).

[0077] As shown in conjunction with reference numeral 530, base station 110 may send an uplink grant at least in part based on a request for additional resources, and UE 305-1 may receive such uplink grant. For example, base station 110 may send an uplink grant to UE 305-1 at least in part based on receiving SR and / or NACK signals (e.g., as described above in conjunction with reference numeral 525).

[0078] As shown in conjunction with reference numeral 535, UE 305-1 can transmit a sidelink channel status indicator, and base station 110 can receive the indicator. For example, UE 305-1 can use uplink grant (e.g., as described above in conjunction with reference numeral 530) to transmit the sidelink channel status indicator. Alternatively or additionally, base station 110 can receive the sidelink channel status indicator on PUCCH, PUSCH, or a combination thereof. For example, in addition to or instead of transmitting the sidelink channel status indicator based at least in part on uplink grant from base station 110, UE 305-1 can use existing PUCCH, PUSCH, and / or other uplink channels to transmit the sidelink channel status indicator.

[0079] As shown in conjunction with reference numeral 540, base station 110 may transmit, at least in part, based on a sidelink channel status indicator, and UE 305-1 may receive authorization for additional resources. For example, base station 110 may transmit new configurations for the sidelink channel, such as indicators for one or more new timeslots on the sidelink channel, one or more new subchannels used on the sidelink channel, new ranges of the MCS used on the sidelink channel, and / or one or more other new resources. In some aspects, this authorization may include an RRC message.

[0080] In some respects, base station 110 may send grants for additional resources based at least in part on determining that the state indicator of the sidelink channel meets certain conditions. For example, base station 110 may determine that the state indicator of the sidelink channel does not allow sidelink communication with a reliability that meets a threshold by determining that one or more resources used on the sidelink channel do not allow sidelink communication with a reliability that meets a threshold. For example, when the MCS supported by one or more resources is outside the range of the MCS indicated by the grant of one or more resources (e.g., the grant described above in conjunction with reference numeral 505), base station 110 may determine that one or more resources do not allow sidelink communication with a reliability that meets a threshold. Alternatively or additionally, base station 110 may receive from UE 305-1 an indication that UE 305-1 has determined the difference between the configuration of the sidelink channel (e.g., as described above with respect to reference numeral 505) and the state indicator of the sidelink channel.

[0081] As shown in conjunction with reference numeral 545, base station 110 can transmit a DCI for the sidelink channel, and UE 305-1 can receive the DCI. As further shown in conjunction with reference numeral 545, base station 110 can transmit on the sidelink channel, and UE 305-1 can receive information intended for UE 305-2 and scheduled by the DCI. In some aspects, the DCI and / or information transmitted by base station 110 (e.g., in conjunction with reference numeral 545) may at least partially correspond to a DCI and / or information transmitted earlier by base station 110 (e.g., in conjunction with reference numeral 520). Therefore, base station 110 can use additional resources on the sidelink channel to retransmit the DCI and / or information for UE 305-1 for forwarding to UE 305-2.

[0082] As shown in conjunction with reference numeral 550, UE 305-1 may transmit this information to UE 305-2 on a sidelink channel. For example, UE 305-1 may transmit this information at least in part based on authorization for additional resources received from base station 110 (e.g., as described above in conjunction with reference numeral 540).

[0083] In some aspects, UE 305-1 may re-execute the CSI procedure with UE 305-2 based at least in part on the authorization of additional resources (e.g., similar to what is described above in conjunction with reference numeral 510). For example, UE 305-1 may re-execute the CSI procedure with UE 305-2 using additional resources on the sidelink channel. Therefore, UE 305-2 may send, at least in part, a new indicator of the new state of the sidelink channel based on the re-execution of the CSI procedure, and UE 305-1 may receive it. Additionally, UE 305-1 may send information to UE 305-2 on the sidelink channel based at least in part on determining, using the new indicator, that the additional resources of the sidelink channel allow sidelink communication with a reliability that meets a threshold (e.g., similar to the determination described above in conjunction with reference numeral 515).

[0084] By using the above combination Figure 5 According to the described technique, UE 305-1 can save resources by suppressing the transmission of information to UE 305-2 that is unlikely to be received and / or successfully decoded by UE 305-2. Furthermore, in some aspects, when UE 305-1 sends a request for additional resources for the sidelink channel after UE 305-1 determines the difference between the current resources on the sidelink channel and the state indicator of the sidelink channel, but before the scheduled PUCCH slot with base station 110, it can reduce the waiting time.

[0085] As mentioned above, Figure 5 For example. Other examples may differ from those regarding... Figure 5 As described.

[0086] Figure 6 This is a diagram illustrating an example process 600 performed, for example, by a first UE according to this disclosure. Example process 600 is an example of the first UE (e.g., UE 120a and / or UE 305-1) performing operations associated with rapid feedback of the transmit-side link channel.

[0087] like Figure 6 As shown, in some aspects, process 600 may include receiving a status indicator of the sidelink channel from a second UE (e.g., UE 120e and / or UE 305-2) on the sidelink channel (block 610). For example, as described above, a first UE (e.g., using one or more of antenna 252, demodulator 254, MIMO detector 256, receiver processor 258, controller / processor 280, and / or memory 282) may receive the status indicator of the sidelink channel from the second UE on the sidelink channel.

[0088] like Figure 6 As further shown, in some aspects, process 600 may include sending a request for additional resources for the sidelink channel to a base station (e.g., base station 110) (block 620). For example, as described above, a first UE (e.g., using one or more of antenna 252, transmit processor 264, TX MIMO processor 266, modulator 254, controller / processor 280, and / or memory 282) may send a request for additional resources for the sidelink channel to the base station. In some aspects, the request is at least in part based on determining that a state indicator of the sidelink channel (e.g., using one or more of MIMO detector 256, receive processor 258, transmit processor 264, TX MIMO processor 266, controller / processor 280, and / or memory 282) meets a condition.

[0089] Process 600 may include additional aspects, such as any single aspect or any combination of aspects described below and / or related to one or more other processes described elsewhere herein.

[0090] In the first aspect, the status indicator of the sidelink channel includes the CSI report.

[0091] In a second aspect, either alone or in combination with the first aspect, process 600 also includes sending a status indicator of the sidelink channel to the base station (e.g., using one or more of antenna 252, transmit processor 264, TX MIMO processor 266, modulator 254, controller / processor 280 and / or memory 282).

[0092] In the third aspect, either alone or in combination with one or more of the first and second aspects, the status indicator of the sidelink channel is transmitted on PUCCH, PUSCH, or a combination thereof.

[0093] In the fourth aspect, either alone or in combination with one or more of the first to third aspects, process 600 further includes receiving uplink grants from the base station (e.g., using one or more of antenna 252, demodulator 254, MIMO detector 256, receive processor 258, transmit processor 264, controller / processor 280 and / or memory 282) at least in part based on a request for additional resources, wherein a status indicator for the sidelink channel is transmitted using the uplink grants.

[0094] In the fifth aspect, either alone or in combination with one or more of the first to fourth aspects, process 600 also includes receiving, at least in part, authorization from the base station for additional resources (e.g., using one or more of antenna 252, demodulator 254, MIMO detector 256, receive processor 258, transmit processor 264, controller / processor 280 and / or memory 282) based on a status indicator of the sidelink channel.

[0095] In the sixth aspect, the authorization includes RRC messages, either alone or in combination with one or more of the first to fifth aspects.

[0096] In the seventh aspect, either alone or in combination with one or more of the first to sixth aspects, process 600 further includes receiving DCI from the base station (e.g., using one or more of antenna 252, demodulator 254, MIMO detector 256, receive processor 258, transmit processor 264, controller / processor 280 and / or memory 282) for the sidelink channel.

[0097] In the eighth aspect, either alone or in combination with one or more of the first to seventh aspects, process 600 further includes receiving (e.g., using one or more of antenna 252, demodulator 254, MIMO detector 256, receive processor 258, transmit processor 264, controller / processor 280 and / or memory 282) information intended for use by the second UE and scheduled by the DCI, based at least in part on determining that a state indicator of the sidelink channel meets a condition, and suppressing the transmission of (e.g., using antenna 252, transmit processor 264, TX MIMO processor 266, modulator 254, controller / processor 280 and / or memory 282) of that information to the second UE.

[0098] In the ninth aspect, either alone or in combination with one or more of the first to eighth aspects, a request for additional resources for the sidelink channel includes a NACK signal.

[0099] In the tenth aspect, either alone or in combination with one or more of the first to ninth aspects, process 600 further includes sending (e.g., using one or more of antenna 252, transmit processor 264, TX MIMO processor 266, modulator 254, controller / processor 280 and / or memory 282) to the base station and using a NACK signal to send an SR for transmitting a status indicator of the sidelink channel.

[0100] In the eleventh aspect, the NACK signal is transmitted on the PUCCH, either alone or in combination with one or more of the first to tenth aspects.

[0101] In the twelfth aspect, determining, either alone or in combination with one or more of the first to eleventh aspects, that the status indicator of the sidelink channel meets the condition includes determining (e.g., using MIMO detector 256, receive processor 258, transmit processor 264, TX MIMO processor 266, controller / processor 280 and / or memory 282) that the current resources of the sidelink channel do not allow sidelink communication with a reliability that meets the threshold.

[0102] In the thirteenth aspect, either alone or in combination with one or more of the first to twelfth aspects, when the MCS supported by the current resource is outside the range of the MCS authorized by the base station, the current resource is determined to be not allowed to have sidelink communication with a reliability that meets the threshold.

[0103] Although Figure 6 An example block of process 600 is shown. In some aspects, process 600 may include more than Figure 6 The blocks described herein may be additional blocks, fewer blocks, different blocks, or blocks with different arrangements. Alternatively, two or more blocks of process 600 may be executed in parallel.

[0104] Figure 7 This is a diagram illustrating an example process 700 performed by a base station, for example, according to various aspects of this disclosure. Example process 700 is an example of an operation performed by a base station (e.g., base station 110) associated with rapid feedback of a receive-side link channel.

[0105] like Figure 7As shown, in some aspects, process 700 may include sending an authorization to the UE (e.g., UE 120a and / or UE 305-1) for one or more resources used on the sidelink channel (block 710). For example, as described above, the base station (e.g., using one or more of the transmit processor 220, TX MIMO processor 230, modulator 232, antenna 234, controller / processor 240, memory 242 and / or scheduler 246) may send an authorization to the UE for one or more resources used on the sidelink channel.

[0106] like Figure 7 As further shown, in some aspects, process 700 may include receiving a request from the UE for additional resources for the sidelink channel (block 720). For example, as described above, the base station (e.g., using one or more of antenna 234, demodulator 232, MIMO detector 236, receive processor 238, controller / processor 240, memory 242, or scheduler 246) may receive a request from the UE for additional resources for the sidelink channel. In some aspects, the request is received at least in part based on authorization to send one or more resources.

[0107] Process 700 may include additional aspects, such as any single aspect or any combination of aspects described below and / or related to one or more other processes described elsewhere herein.

[0108] In a first aspect, process 700 also includes a status indicator of the sidelink channel received from the UE (e.g., using one or more of antenna 234, demodulator 232, MIMO detector 236, receive processor 238, controller / processor 240, memory 242, or scheduler 246).

[0109] In the second aspect, either alone or in combination with the first aspect, the status indicator of the sidelink channel is received on PUCCH, PUSCH, or a combination thereof.

[0110] In the third aspect, either alone or in combination with one or more of the first and second aspects, the status indicator of the sidelink channel includes a CSI report.

[0111] In the fourth aspect, either alone or in combination with one or more of the first to third aspects, process 700 further includes sending an uplink grant to the UE (e.g., using one or more of the transmit processor 220, TX MIMO processor 230, modulator 232, antenna 234, controller / processor 240, memory 242 and / or scheduler 246) at least in part based on receiving a request for additional resources, wherein a status indicator of the sidelink channel is received using that uplink grant.

[0112] In the fifth aspect, either alone or in combination with one or more of the first to fourth aspects, process 700 also includes, at least in part, sending to the UE an authorization for additional resources (e.g., using one or more of the transmit processor 220, TXMIMO processor 230, modulator 232, antenna 234, controller / processor 240, memory 242 and / or scheduler 246) based on a status indicator of the sidelink channel.

[0113] In the sixth aspect, the authorization includes RRC messages, either alone or in combination with one or more of the first to fifth aspects.

[0114] In the seventh aspect, either alone or in combination with one or more of the first to sixth aspects, the authorization of additional resources is based at least in part on determining that a status indicator of the sidelink channel (e.g., using one or more of the transmit processor 220, TX MIMO processor 230, MIMO detector 236, receive processor 238, controller / processor 240 and / or memory 242) meets a condition for transmission.

[0115] In the eighth aspect, determining, either alone or in combination with one or more of the first to seventh aspects, that the status indicator of the sidelink channel satisfies the condition includes determining (e.g., using the transmit processor 220, TX MIMO processor 230, MIMO detector 236, receive processor 238, controller / processor 240, and / or memory 242) that one or more resources used on the sidelink channel do not allow sidelink communication with a reliability that meets the threshold.

[0116] In the ninth aspect, either alone or in combination with one or more of the first to eighth aspects, when one or more resources support an MCS outside the scope of an MCS authorized by one or more resources, it is determined that one or more resources do not allow sidelink communication with a reliability that meets the threshold.

[0117] In the tenth aspect, either alone or in combination with one or more of the first to ninth aspects, process 700 further includes transmitting to the UE (e.g., using one or more of the transmit processor 220, TX MIMO processor 230, modulator 232, antenna 234, controller / processor 240, memory 242 and / or scheduler 246) a DCI for the sidelink channel.

[0118] In the eleventh aspect, either alone or in combination with one or more of the first to tenth aspects, process 700 further includes transmitting to the UE on the sidelink channel (e.g., using one or more of the transmit processor 220, TX MIMO processor 230, modulator 232, antenna 234, controller / processor 240, memory 242 and / or scheduler 246) information intended for use by the second UE and scheduled by the DCI, wherein a request for additional resources is received at least in part based on the transmission of information intended for use by the second UE.

[0119] In the twelfth aspect, either alone or in combination with one or more of the first to eleventh aspects, a request for additional resources for the sidelink channel includes a NACK signal.

[0120] In the thirteenth aspect, either alone or in combination with one or more of the first to twelfth aspects, process 700 further includes receiving from the UE (e.g., using one or more of antenna 234, demodulator 232, MIMO detector 236, receive processor 238, controller / processor 240, memory 242, or scheduler 246) and using a NACK signal to receive an SR for transmitting a status indicator of the sidelink channel.

[0121] In the fourteenth aspect, the NACK signal is received on the PUCCH, either alone or in combination with one or more of the first to thirteenth aspects.

[0122] Although Figure 7 An example block of process 700 is shown. In some aspects, process 700 may include more than Figure 7 The blocks described herein may be additional blocks, fewer blocks, different blocks, or blocks with different arrangements. Alternatively, two or more blocks of process 700 may be executed in parallel.

[0123] The following provides an overview of some aspects of this disclosure:

[0124] Aspect 1: A method of wireless communication performed by a first user equipment (UE), comprising: receiving a state indicator of a sidelink channel from a second UE on a sidelink channel; and sending a request for additional resources for the sidelink channel to a base station based at least in part on determining that the state indicator of the sidelink channel meets a condition.

[0125] Aspect 2: The method as described in aspect 1, wherein the status indicator of the sidelink channel includes a channel status indicator report.

[0126] Aspect 3: The method of any one of Aspects 1 to 2 further includes: sending a status indicator of the sidelink channel to the base station.

[0127] Aspect 4: The method of aspect 3, wherein the status indicator of the sidelink channel is transmitted on the physical uplink control channel, the physical uplink shared channel, or a combination thereof.

[0128] Aspect 5: The method of any one of Aspects 3 to 4 further includes: receiving uplink grants from the base station at least in part based on sending a request for additional resources, wherein a status indicator of the sidelink channel is sent using the uplink grant.

[0129] Aspect 6: The method of any one of aspects 3 to 5 further includes: receiving authorization for additional resources from the base station based at least in part on the status indicator of the sidelink channel.

[0130] Aspect 7: The method of aspect 6, wherein the authorization includes a radio resource configuration message.

[0131] Aspect 8: The method of any one of Aspects 1 to 7 further includes: receiving downlink control information (DCI) for the sidelink channel from the base station.

[0132] Aspect 9: The method of aspect 8 further includes: receiving information intended for use by the second UE and scheduled by the DCI; and suppressing the transmission of information to the second UE based at least in part on determining that the state indicator of the sidelink channel meets the condition.

[0133] Aspect 10: The method of any of Aspects 1 to 9, wherein the request for additional resources for the sidelink channel includes a negative acknowledgment (NACK) signal.

[0134] Aspect 11: The method of aspect 10 further includes: sending a scheduling request to the base station and using a NACK signal to send a status indicator for the side link channel.

[0135] Aspect 12: The method of any one of Aspects 10 to 11, wherein the NACK signal is transmitted on the physical uplink control channel.

[0136] Aspect 13: The method of any one of Aspects 1 to 12, wherein determining that the status indicator of the sidelink channel satisfies the condition includes determining that the current resources for the sidelink channel do not allow sidelink communication with a reliability that satisfies the threshold.

[0137] Aspect 14: The method of aspect 13, wherein when the modulation and coding scheme (MCS) supported by the current resource is outside the range of the MCS permitted by the base station, it is determined that the current resource does not allow sidelink communication with a reliability that meets the threshold.

[0138] Aspect 15: A method of wireless communication performed by a base station, comprising: sending to a UE an authorization for one or more resources to be used on a sidelink channel; and receiving from the UE, at least in part, a request for additional resources for the sidelink channel based on the authorization for sending one or more resources.

[0139] Aspect 16: The method of aspect 15 further includes: receiving a status indicator of the side link channel from the UE.

[0140] Aspect 17: The method of aspect 16, wherein the status indicator of the sidelink channel is received on the physical uplink control channel, the physical uplink shared channel, or a combination thereof.

[0141] Aspect 18: The method of any one of Aspects 16 to 17, wherein the status indicator of the sidelink channel includes a channel status indicator report.

[0142] Aspect 19: The method of any of Aspects 16 to 18 further includes: sending an uplink grant to the UE at least in part based on receiving a request for additional resources, wherein a status indicator of the sidelink channel is received using the uplink grant.

[0143] Aspect 20: The method of any one of aspects 16 to 18 further includes: sending authorization of additional resources to the UE at least in part based on the status indicator of the side link channel.

[0144] Aspect 21: The method of aspect 20, wherein the authorization includes a radio resource configuration message.

[0145] Aspect 22: The method of any of Aspects 20 to 21, wherein the granting of additional resources is based at least in part on determining that the state indicator of the sidelink channel satisfies the conditions for transmission.

[0146] Aspect 23: The method of aspect 22, wherein determining that the state indicator of the sidelink channel satisfies the condition includes determining that sidelink communication with a reliability that satisfies a threshold is not permitted for one or more resources on the sidelink channel.

[0147] Aspect 24: The method of aspect 23, wherein one or more resources are determined to disallow sidelink communication with a reliability that meets a threshold when the modulation and coding scheme (MCS) supported by one or more resources is outside the scope of the MCS indicated by the license of one or more resources.

[0148] Aspect 25: The method of any one of Aspects 15 to 24 further includes: sending downlink control information (DCI) for the sidelink channel to the UE.

[0149] Aspect 26: The method of aspect 25 further includes transmitting information intended for use by a second UE and scheduled by the DCI to the UE via a side link channel, wherein a request for additional resources is received at least in part based on the transmission of the information intended for use by the second UE.

[0150] Aspect 27: The method of any of Aspects 15 to 26, wherein the request for additional resources for the sidelink channel includes a negative acknowledgment (NACK) signal.

[0151] Aspect 28: The method of aspect 27 further includes: receiving from the UE and using a NACK signal to receive a scheduling request for transmitting a status indicator of the sidelink channel.

[0152] Aspect 29: The method of any one of Aspects 27 to 28, wherein the NACK signal is received on the physical uplink control channel.

[0153] Aspect 30: An apparatus for wireless communication at a device, comprising a processor, a memory coupled to the processor, and instructions stored in the memory and executable by the processor to cause the apparatus to perform methods as described in one or more of aspects 1-14.

[0154] Aspect 31: An apparatus for wireless communication, comprising a memory and one or more processors coupled to the memory, the memory and the one or more processors being configured to perform the methods of one or more aspects of aspects 1-14.

[0155] Aspect 32: An apparatus for wireless communication, comprising at least one component for performing a method as described in one or more aspects of aspects 1-14.

[0156] Aspect 33: A non-transitory computer-readable medium storing code for wireless communication, the code including instructions executable by a processor to perform methods as described in one or more aspects of aspects 1-14.

[0157] Aspect 34: A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising one or more instructions, which, when executed by one or more processors of a device, cause the device to perform a method as described in one or more aspects of aspects 1-14.

[0158] Aspect 35: An apparatus for wireless communication at a device, comprising a processor, a memory coupled to the processor, and instructions stored in the memory and executable by the processor to cause the apparatus to perform one or more methods as described in aspects 15-29.

[0159] Aspect 36: An apparatus for wireless communication, comprising a memory and one or more processors coupled to the memory, the memory and the one or more processors being configured to perform one or more methods as described in aspects 15-29.

[0160] Aspect 37: An apparatus for wireless communication, comprising at least one component for performing a method as described in one or more of aspects 15-29.

[0161] Aspect 38: A non-transitory computer-readable medium storing code for wireless communication, the code including instructions executable by a processor to perform one or more methods as described in aspects 15-29.

[0162] Aspect 39: A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising one or more instructions which, when executed by one or more processors of a device, cause the device to perform one or more methods as described in aspects 15-29.

[0163] The foregoing disclosure provides illustrations and descriptions, but is not intended to be exhaustive or to limit aspects to the precise form disclosed. Modifications and alterations may be made based on the foregoing disclosure, and may also be derived from practice.

[0164] As used herein, the term "component" is intended to be interpreted broadly as hardware and / or a combination of hardware and software. "Software" should be interpreted broadly as instructions, instruction sets, code, code segments, program code, programs, subroutines, software modules, application programs, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures and / or functions, whether referred to as software, firmware, middleware, microcode, hardware description languages, or otherwise. As used herein, processors are implemented in hardware and / or a combination of hardware and software. Clearly, the systems and / or methods described herein can be implemented in various forms of hardware and / or combinations of hardware and software. The actual dedicated control hardware or software code used to implement these systems and / or methods is not a limitation in these respects. Therefore, this document describes the operation and behavior of systems and / or methods without reference to any specific software code—it should be understood that software and hardware can be designed to implement systems and / or methods, at least in part, based on the descriptions herein.

[0165] As used in this article, depending on the context, satisfying the threshold can mean greater than the threshold, greater than or equal to the threshold, less than the threshold, less than or equal to the threshold, equal to the threshold, not equal to the threshold, etc.

[0166] Even if a specific combination of features is stated in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of aspects. In fact, many of these features can be combined in ways not specifically stated in the claims and / or not disclosed in the specification. Although each of the following dependent claims may be directly dependent on only one claim, the disclosure of aspects includes each dependent claim combined with all other claims in the claim set. As used herein, the phrase “at least one” in the list of items refers to any combination of these items, including single members. For example, “at least one of a, b, or c” is intended to cover a, b, c, ab, ac, bc, and abc, as well as any combination having 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).

[0167] Unless explicitly described herein, no element, action, or instruction used herein should be construed as essential or fundamental. Furthermore, as used herein, “a” is intended to include one or more items and is interchangeable with “one or more.” Furthermore, as used herein, “the” is intended to include one or more items related to it and is interchangeable with “one or more.” Furthermore, as used herein, the terms “set” and “group” are intended to include one or more items (e.g., related items, unrelated items, or a combination of related and unrelated items) and are interchangeable with “one or more.” If intended to refer to an item, “only one” or similar language is used. Furthermore, as used herein, the term “having” is intended to be an open-ended term. Furthermore, unless explicitly stated otherwise, the word “based on” means “at least partially based on.” Furthermore, as used herein, unless explicitly stated otherwise, the term “or” is inclusive when used in a series and is interchangeable with “and / or” (e.g., if used in conjunction with “any” or “only one of them”).

Claims

1. A first user equipment (UE), comprising: transceiver; At least one memory containing code; and One or more processors, the one or more processors being configured to execute the code to cause the first UE: Receive sidelink grants from a network entity via the transceiver for one or more resources used on the sidelink channel; The transceiver receives, via the transceiver and on the sidelink channel, a status indicator of the sidelink channel associated with the sidelink grant from the second UE; and The request for additional resources for the sidelink channel is sent via the transceiver to the network entity, at least in part based on the condition that the status indicator of the sidelink channel meets the condition, which is at least in part based on the fact that the modulation and coding scheme (MCS) supported by the current resources of the sidelink channel is outside the scope of the MCS authorized by the network entity.

2. The first UE as described in claim 1, wherein, The status indicator of the sidelink channel includes the channel status indicator report.

3. The first UE as described in claim 1, wherein, The one or more processors are further configured to cause the first UE to: The status indicator of the sidelink channel is sent to the network entity via the transceiver.

4. The first UE as described in claim 3, wherein, The status indicator of the sidelink channel is transmitted on the physical uplink control channel, the physical uplink shared channel, or a combination thereof.

5. The first UE as described in claim 3, wherein, The one or more processors are further configured to cause the first UE to: At least in part, based on sending the request for the additional resources, uplink authorization is received via the transceiver and from the network entity. The status indicator of the sidelink channel is sent using the uplink grant.

6. The first UE as described in claim 3, wherein, The one or more processors are further configured to cause the first UE to: Sidelink grants for the additional resources are received via the transceiver and from the network entity, at least in part based on the status indicator of the sidelink channel.

7. The first UE as claimed in claim 6, wherein, The sidelink authorization for the one or more resources includes radio resource configuration messages.

8. The first UE as claimed in claim 1, wherein the one or more processors are further configured to cause the first UE to: Downlink control information (DCI) for the sidelink channel is received via the transceiver and from the network entity.

9. The first UE as claimed in claim 8, wherein, The one or more processors are further configured to cause the first UE to: Receive information intended for use by the second UE and scheduled by the DCI via the transceiver; The transmission of the information to the second UE is suppressed, at least in part, based on the fact that the state indicator of the side link channel satisfies the condition.

10. The first UE as claimed in claim 1, wherein the request for additional resources for the sidelink channel includes a negative acknowledgment (NACK) signal.

11. The first UE of claim 10, wherein the one or more processors are further configured to cause the first UE to: The system sends a scheduling request for transmitting the status indicator of the sidelink channel via the transceiver and to the network entity using the NACK signal.

12. The first UE as claimed in claim 10, wherein the NACK signal is transmitted on the physical uplink control channel.

13. The first UE of claim 1, wherein the condition is met by the status indicator of the sidelink channel including the current resources for the sidelink channel not allowing sidelink communication with a reliability that meets a threshold.

14. The first UE of claim 13, wherein when the MCS supported by the current resource is outside the range of the MCS, the current resource does not allow sidelink communication with reliability that satisfies the threshold, the range of the MCS being indicated by the sidelink grant of the one or more resources.

15. A network entity, comprising: transceiver; At least one memory containing code; One or more processors, configured to execute the code to cause the network entity to: The transceiver transmits a sidelink grant to the user equipment (UE) for one or more resources used on the sidelink channel, the sidelink grant indicating the range of modulation and coding scheme (MCS); At least in part, based on the MCS supported by the one or more resources, the UE receives requests for additional resources for the sidelink channel via the transceiver and from the UE outside the range of the MCS. and Send a sidelink grant for additional resources for the sidelink channel.

16. A method for wireless communication performed by a first user equipment (UE), comprising: Receive sidelink authorization from a network entity for one or more resources used on the sidelink channel; On the sidelink channel, a status indicator of the sidelink channel associated with the sidelink grant is received from the second UE; The request for additional resources for the sidelink channel is sent to the network entity at least in part based on the determination that the status indicator of the sidelink channel meets a condition, which is at least in part based on the fact that the modulation and coding scheme (MCS) supported by the current resources of the sidelink channel is outside the scope of the MCS authorized by the network entity.

17. The method of claim 16, wherein, The status indicator of the sidelink channel includes a channel status indicator report.

18. The method of claim 16, further comprising: Send the status indicator of the sidelink channel to the network entity.

19. The method of claim 18, wherein, The status indicator of the sidelink channel is transmitted on the physical uplink control channel, the physical uplink shared channel, or a combination thereof.

20. The method of claim 18, further comprising: Uplink authorization is received from the network entity at least in part based on the sending of the request for the additional resources. The status indicator of the sidelink channel is sent using the uplink grant.

21. The method of claim 18, further comprising: The sidelink authorization for the additional resources is received from the network entity at least in part based on the status indicator of the sidelink channel.

22. The method of claim 21, wherein, The sidelink authorization for the one or more resources includes radio resource configuration messages.

23. The method of claim 16, further comprising: Receive downlink control information (DCI) for the sidelink channel from the network entity.

24. The method of claim 23, further comprising: Receive information intended for use by the second UE and scheduled by the DCI; and The transmission of the information to the second UE is suppressed at least in part based on determining that the state indicator of the side link channel satisfies the condition.

25. The method of claim 16, wherein, Additional resource requests for the sidelink channel include negative acknowledgment (NACK) signals.

26. The method of claim 25, further comprising: Send a scheduling request to the network entity using the NACK signal for transmitting the status indicator of the sidelink channel.

27. The method of claim 25, wherein, The NACK signal is sent on the physical uplink control channel.

28. The method of claim 16, wherein, Determining that the status indicator of the sidelink channel satisfies the condition includes: determining that the current resources of the sidelink channel do not allow sidelink communication with reliability that meets the threshold.

29. The method of claim 28, wherein, When the MCS supported by the current resource is outside the scope of the MCS, the current resource is determined to be disallowed for sidelink communication with reliability that meets the threshold, the scope of the MCS being indicated by the sidelink authorization of the one or more resources.

30. A method for performing wireless communication by a network entity, comprising: Send a sidelink grant to a user equipment (UE) for one or more resources used on a sidelink channel, the sidelink grant indicating the range of modulation and coding scheme (MCS); The UE receives a request for additional resources for the sidelink channel, at least in part, based on the fact that the MCS supported by one or more resources is outside the scope of the MCS. and Send a sidelink grant for additional resources for the sidelink channel.

31. An apparatus for wireless communication, comprising components for performing the method according to any one of claims 16-29.

32. An apparatus for wireless communication, comprising components for performing the method according to claim 30.

33. A computer-readable medium having one or more computer instructions recorded thereon, which, when executed by one or more processors of a first user equipment (UE), cause the one or more processors to perform the method according to any one of claims 16-29.

34. A computer-readable medium having one or more computer instructions recorded thereon, which, when executed by one or more processors of a network entity, cause the one or more processors to perform the method according to claim 30.

35. A computer program product comprising one or more computer instructions, which, when executed by one or more processors of a first user equipment (UE), cause the one or more processors to perform the method according to any one of claims 16-29.

36. A computer program product comprising one or more computer instructions, which, when executed by one or more processors of a network entity, cause the one or more processors to perform the method of claim 30.

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