Coordinated sidelink resource allocation

Abstract

Methods, systems, and devices for wireless communications are described. A first user equipment (UE) may send a buffer status report for a first sidelink transmission to the device to a base station. The first UE may receive sidelink control information from a second UE, the sidelink control information scheduling the first UE for time resources for a second sidelink transmission from the second UE, the sidelink control information including an indication of a serving cell identifier for the second UE. The first UE may detect a half-duplex scheduling conflict or a possible half-duplex scheduling conflict based on the serving cell identifier, and send an indication of the conflict to a serving base station. The base station may then assign or reassign resources for the first sidelink transmission to avoid the scheduling conflict.

Description

Technical Field

[0001] The following relates to wireless communications and, more particularly, to coordinated sidelink resource allocation. Background Art

[0002] Wireless communication systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcasting, etc. These systems may be able to support communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multiple access systems include fourth generation (4G) systems (such as long term evolution (LTE) systems, improved LTE (LTE-A) systems, or LTE-A Pro systems) and fifth generation (5G) systems (which may be referred to as new radio (NR) systems). These systems may employ techniques such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple access communication system may include one or more base stations or one or more network access nodes, each base station or network access node simultaneously supporting communication for multiple communication devices (which may be referred to as user equipment (UE)).

[0003] Some wireless communication systems support sidelinks for communication between devices. For example, device-to-device (D2D) and vehicle-to-everything (V2X) systems may support communication between UEs on sidelinks. In some cases, a base station may select resources for a UE on a sidelink. Some techniques for allocating resources on a sidelink may be improved while observing certain network constraints (such as half-duplex communication constraints). Summary of the invention

[0004] The described technology relates to improved methods, systems, devices and apparatuses for supporting coordinated sidelink resource allocation. A wireless communication system may support devices such as user equipment (UE) to communicate via a sidelink. In some cases, a base station may allocate resources for sidelink communication between UEs, but the base station may not know the intended receiver of the permitted sidelink resources, which may result in a half-duplex scheduling conflict at one of the UEs. The UE and base station described herein may implement a technology for coordinated sidelink resource allocation to avoid half-duplex scheduling conflicts. A first UE scheduled to both send and receive sidelink communications may detect a scheduling conflict or the possibility of a scheduling conflict, and warn a serving cell of the conflict. The first UE may then be rescheduled for its sidelink transmission to avoid scheduling conflicts. In some cases, the first UE may receive sidelink control information from a second UE (e.g., using an upcoming sidelink transmission to the first UE), wherein the sidelink control information includes an indicator of a serving cell. The first UE may then apply a technology for avoiding half-duplex scheduling conflicts based on whether the second UE has the same or different serving cells. For example, the first UE may request permission for reconfiguration, or the first UE may report a destination identifier to the serving cell to avoid scheduling conflicts.

[0005] A method of wireless communication at a first UE is described. The method may include sending a buffer status report for a first sidelink transmission to a device to a base station; and receiving sidelink control information from a second UE, the sidelink control information scheduling the first UE for time resources for a second sidelink transmission from the second UE, the sidelink control information including an indication of a serving cell identifier of the second UE.

[0006] An apparatus for wireless communication at a first UE is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to send a buffer status report for a first sidelink transmission to a device to a base station; and receive sidelink control information from a second UE, the sidelink control information scheduling the first UE for a time resource for a second sidelink transmission from the second UE, the sidelink control information including an indication of a serving cell identifier of the second UE.

[0007] An apparatus for wireless communication at a first UE is described. The apparatus may include means for sending a buffer status report for a first sidelink transmission to a device to a base station; and receiving sidelink control information from a second UE, the sidelink control information scheduling the first UE for time resources for a second sidelink transmission from the second UE, the sidelink control information including an indication of a serving cell identifier for the second UE.

[0008] A non-transitory computer-readable medium storing code for wireless communication at a first UE is described. The code may include instructions executable by a processor to: send a buffer status report for a first sidelink transmission to a device to a base station; and receive sidelink control information from a second UE, the sidelink control information scheduling the first UE for a time resource for a second sidelink transmission from the second UE, the sidelink control information including an indication of a serving cell identifier of the second UE.

[0009] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following operations: receiving a grant to schedule time resources for a first sidelink transmission from a base station, wherein both the first sidelink transmission and the second sidelink transmission are scheduled for time resources corresponding to a half-duplex scheduling conflict for the first UE; sending a request to the base station for a grant to reconfigure the first sidelink transmission for the first UE based on the half-duplex scheduling conflict; and receiving a grant from the base station to reconfigure scheduling of the first UE for different time resources for the first sidelink transmission.

[0010] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following operations: determining that a serving cell identifier for a second UE does not match a serving cell identifier for a first UE, wherein a request for reconfiguration grant may be sent based on the determination.

[0011] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a request for a reconfiguration grant includes a bitmap of time slots corresponding to a set of half-duplex scheduling conflicts, the set of half-duplex scheduling conflicts including at least the half-duplex scheduling conflict.

[0012] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the request to reconfigure the grant may be sent with feedback for a grant to schedule time resources for the first sidelink transmission.

[0013] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the request for a reconfiguration grant can be sent based on receiving sidelink control information, receiving a grant to schedule a first sidelink transmission, or both.

[0014] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the request for a reconfiguration grant can be based on a priority of the first sidelink transmission, the second sidelink transmission, or both.

[0015] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, means, or instructions for determining that a serving cell identifier for the second UE matches a serving cell identifier for the first UE.

[0016] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following operations: determining that a serving cell identifier for a second UE matches a serving cell identifier for a first UE; sending an indicator of a destination identifier to a base station based on that the serving cell identifier for the second UE matches the serving cell identifier for the first UE; and receiving a grant for a first sidelink transmission from the base station, wherein the grant schedules the first UE to use different time resources for a second sidelink transmission.

[0017] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following operations: receiving a second sidelink transmission from a second UE during a time resource; and sending a first sidelink transmission during a different time resource.

[0018] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following operations: determining that a first sidelink transmission can be scheduled for a time resource together with a second sidelink transmission; determining that the first sidelink transmission can have a higher priority than the second sidelink transmission; discarding the second sidelink transmission based on the higher priority; and receiving the first sidelink transmission.

[0019] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following operations: receiving a configuration for avoiding a half-duplex scheduling conflict, wherein a first sidelink transmission and a second sidelink transmission may be scheduled for a half-duplex scheduling conflict.

[0020] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a configuration for avoiding half-duplex scheduling conflicts may be received via higher layer signaling, sidelink control information, downlink control information including a sidelink grant, or a combination thereof.

[0021] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the configuration for avoiding half-duplex scheduling conflicts can be based on a first priority for the first sidelink transmission, a second priority for the second sidelink transmission, or both.

[0022] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the first sidelink transmission, the second sidelink transmission, or both may be sent via a PC5 interface.

[0023] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the indication of the serving cell identifier corresponds to one or more least significant bits of the serving cell identifier of the second UE.

[0024] A method of wireless communication at a second UE is described. The method may include sending a buffer status report for a sidelink transmission to a first UE to a base station; receiving a grant for a sidelink transmission during a time resource from the base station based on sending the buffer status report; and sending sidelink control information to the first UE, the sidelink control information including an indication of the sidelink transmission during the time resource and an indication of a serving cell identifier.

[0025] An apparatus for wireless communication at a second UE is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to send a buffer status report for a sidelink transmission to a first UE to a base station; receive a grant for a sidelink transmission during a time resource from the base station based on sending the buffer status report; and send sidelink control information to the first UE, the sidelink control information including an indication of the sidelink transmission during the time resource and an indication of a serving cell identifier.

[0026] Another apparatus for wireless communication at a second UE is described. The apparatus may include means for performing the following operations: sending a buffer status report for a sidelink transmission to a first UE to a base station; receiving a grant for a sidelink transmission during a time resource from the base station based on sending the buffer status report; and sending sidelink control information to the first UE, the sidelink control information including an indication of the sidelink transmission during the time resource and an indication of a serving cell identifier.

[0027] A non-transitory computer-readable medium storing code for wireless communication at a second UE is described. The code may include instructions executable by a processor to: send a buffer status report for a sidelink transmission to a first UE to a base station; receive a grant for a sidelink transmission during a time resource from the base station based on sending the buffer status report; and send sidelink control information to the first UE, the sidelink control information including an indication of the sidelink transmission during the time resource and an indication of a serving cell identifier.

[0028] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following operations: receiving a reconfiguration grant for sidelink transmission from a base station, wherein the reconfiguration grant is based on sending sidelink control information including an indication of a serving cell identifier to schedule the sidelink transmission for different time resources.

[0029] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, means, or instructions for sending a sidelink transmission to the first UE during the time resource.

[0030] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, means, or instructions for performing the following operations: sending a configuration for avoiding half-duplex scheduling conflicts to the first UE via sidelink control information.

[0031] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the sidelink transmission may be sent via a PC5 interface.

[0032] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the indication of the serving cell identifier corresponds to one or more least significant bits of the serving cell identifier.

[0033] A method of wireless communication at a base station is described. The method may include receiving a first buffer status report corresponding to a first sidelink transmission to a device from a first UE; and receiving an indicator of a half-duplex scheduling conflict for the first UE from the first UE based on the first sidelink transmission from the first UE to the device and a second sidelink transmission from the second UE to the first UE.

[0034] An apparatus for wireless communication at a base station is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to receive a first buffer status report corresponding to a first sidelink transmission to a device from a first UE; and receive an indicator of a half-duplex scheduling conflict for the first UE from the first UE based on the first sidelink transmission from the first UE to the device and the second sidelink transmission from the second UE to the first UE.

[0035] Another apparatus for wireless communication at a base station is described. The apparatus may include means for: receiving a first buffer status report corresponding to a first sidelink transmission to a device from a first UE; and receiving an indicator of a half-duplex scheduling conflict for the first UE from the first UE based on the first sidelink transmission from the first UE to the device and a second sidelink transmission from the second UE to the first UE.

[0036] A non-transitory computer-readable medium storing code for wireless communication at a base station is described. The code may include instructions executable by a processor to: receive a first buffer status report corresponding to a first sidelink transmission to a device from a first UE; and receive an indicator of a half-duplex scheduling conflict for the first UE from the first UE based on the first sidelink transmission from the first UE to the device and the second sidelink transmission from the second UE to the first UE.

[0037] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following operations: sending a grant to schedule time resources for a first sidelink transmission to a first UE; receiving a request from the first UE to reconfigure the grant for the first sidelink transmission based on a half-duplex scheduling conflict; and sending a grant for reconfiguration of the first sidelink transmission to the first UE based on the request and the half-duplex scheduling conflict.

[0038] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the indicator includes a bitmap of time slots corresponding to a set of half-duplex scheduling conflicts for the first UE, the half-duplex scheduling conflict set including at least the half-duplex scheduling conflict.

[0039] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the request to reconfigure the grant may be received with feedback for the grant for the first sidelink transmission.

[0040] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following operations: receiving a second buffer status report from a second UE; sending a second grant for a second sidelink transmission to the second UE based on receiving the second buffer status report; receiving an indicator of a destination identifier from the first UE based on the second UE and the first UE having matching serving cell identifiers; and sending a grant for the first sidelink transmission to the first UE based on the indicator of the destination identifier, wherein the grant schedules the first UE for different time resources for the second sidelink transmission.

[0041] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following operations: sending a configuration for avoiding half-duplex scheduling conflicts via higher layer signaling, downlink control information including sidelink grants, or both.

[0042] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the configuration for avoiding half-duplex scheduling conflicts can be based on a first priority for the first sidelink transmission, a second priority for the second sidelink transmission, or both.

[0043] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the first sidelink transmission, the second sidelink transmission, or both may be sent via a PC5 interface. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1

[0013] An example of a system for wireless communication supporting coordinated sidelink resource allocation in accordance with aspects of the present disclosure is shown.

[0045] Figure 2 An example of a wireless communication system supporting coordinated sidelink resource allocation in accordance with aspects of the present disclosure is shown.

[0046] Figure 3 Examples of intra-cell and inter-cell configurations supporting coordinated sidelink resource allocation in accordance with aspects of the present disclosure are shown.

[0047] Figure 4 An example of a process flow to support coordinated sidelink resource allocation in accordance with aspects of the present disclosure is shown.

[0048] Figure 5 An example of a process flow to support coordinated sidelink resource allocation in accordance with aspects of the present disclosure is shown.

[0049] Figure 6 and Figure 7 A block diagram of an apparatus supporting coordinated sidelink resource allocation in accordance with aspects of the present disclosure is shown.

[0050] Figure 8 A block diagram of a communications manager supporting coordinated sidelink resource allocation in accordance with aspects of the present disclosure is shown.

[0051] Fig. 9 A schematic diagram of a system including devices supporting coordinated sidelink resource allocation in accordance with aspects of the present disclosure is shown.

[0052] Fig.10 and Fig.11 A block diagram of an apparatus supporting coordinated sidelink resource allocation in accordance with aspects of the present disclosure is shown.

[0053] Fig.12 A block diagram of a communications manager supporting coordinated sidelink resource allocation in accordance with aspects of the present disclosure is shown.

[0054] Fig.13 A schematic diagram of a system including devices supporting coordinated sidelink resource allocation in accordance with aspects of the present disclosure is shown.

[0055] Figures 14 to 19 A flow chart illustrating a method of supporting coordinated sidelink resource allocation in accordance with aspects of the present disclosure is shown. DETAILED DESCRIPTION

[0056] A wireless communication system may support devices that communicate via a sidelink. For example, in a device-to-device (D2D) or vehicle-to-everything (V2X) system, a user equipment (UE) may communicate with another UE on a sidelink. In some cases, a device that communicates using a sidelink may operate according to a half-duplex constraint in order to save power usage, where the half-duplex constraint restricts the wireless device to transmit or receive at a certain time. In some cases, the UE involved in the sidelink communication may autonomously select time and frequency resources for the sidelink communication. Additionally or alternatively, a base station may allocate resources for sidelink communication between UEs. The UE may send a buffer status report (BSR) to the base station to request resources, and the base station may send a sidelink grant with resource allocation for sidelink transmission. In some cases, if the base station allocates resources for sidelink communication, the base station may not know the intended receiver of the granted sidelink resources. In some cases, the base station may grant sidelink resources to the first UE, but the base station may not be aware that the recipient of the transmission from the first UE (e.g., the second UE) has been granted sidelink resources for transmission at the same time. Therefore, the second UE may be scheduled to both transmit and receive on the sidelink resources at the same time, which may not comply with the half-duplex constraint and result in a scheduling conflict.

[0057] The technology described herein is a coordinated sidelink resource allocation to avoid half-duplex scheduling conflicts. A first UE scheduled to both send and receive sidelink communications can detect a scheduling conflict or the possibility of a scheduling conflict, and warn the serving cell of the conflict. The first UE can then be rescheduled for its sidelink transmission to avoid scheduling conflicts. In some cases, the first UE can receive sidelink control information from the second UE using an upcoming sidelink transmission to the first UE, the sidelink control information including an indicator of the serving cell. The first UE can then apply a technique for avoiding half-duplex scheduling conflicts based on whether the second UE has the same or different serving cells. In some cases, the first UE can determine that the second UE has the same serving cell. In this example, the first UE can send a destination identifier to the base station, indicating that the first UE is the intended recipient of the sidelink transmission from the second UE. The base station can then schedule the first UE to avoid half-duplex scheduling conflicts. If the first UE and the second UE do not have the same serving cell, the first UE can send a request for granting reconfiguration to its serving base station. The first UE can then receive a grant for reconfiguration with different resource allocations to avoid half-duplex scheduling conflicts. In some cases, if the first UE and the second UE have the same serving cell, the first UE may request permission for reconfiguration.Additional techniques for configuring a coordination scheme are described herein so the first UE can determine when to request reconfiguration and when to indicate a destination identifier.

[0058] Various aspects of the present disclosure are initially described in the context of a wireless communication system. Various aspects of the present disclosure are further illustrated by and described with reference to apparatus diagrams, system diagrams, and flow charts related to coordinated sidelink resource allocation.

[0059] Figure 1 An example of a wireless communication system 100 supporting coordinated sidelink resource allocation according to aspects of the present disclosure is shown. The wireless communication system 100 may include one or more base stations 105, one or more UEs 115, and a core network 130. In some examples, the wireless communication system 100 may be a long term evolution (LTE) network, an improved LTE (LTE-A) network, an LTE-A Pro network, or a new radio (NR) network. In some examples, the wireless communication system 100 may support enhanced broadband communications, ultra-reliable (e.g., mission-critical) communications, low-latency communications, communications with low-cost and low-complexity devices, or any combination thereof.

[0060] Base stations 105 may be dispersed throughout a geographic area to form wireless communication system 100, and may be devices of different forms or with different capabilities. Base stations 105 and UEs 115 may communicate wirelessly via one or more communication links 125. Each base station 105 may provide a coverage area 110 over which UEs 115 and base stations 105 may establish one or more communication links 125. Coverage area 110 may be an example of a geographic area over which base stations 105 and UEs 115 may support transmission of signals according to one or more radio access technologies.

[0061] UEs 115 may be dispersed throughout the coverage area 110 of the wireless communication system 100, and each UE 115 may be stationary, mobile, or both at different times. UEs 115 may be devices in different forms or with different capabilities. Figure 1 Some example UEs 115 are shown in FIG. 1. The UEs 115 described herein can communicate with various types of devices, such as other UEs 115, base stations 105, or network devices (e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network devices), such as Figure 1 shown.

[0062] The base stations 105 may communicate with the core network 130, or with each other, or both. For example, the base stations 105 may be connected to the core network 130 via one or more backhaul links 120 (e.g., via S1, N2, N3, or other interfaces). The base stations 105 may communicate with each other directly (e.g., directly between the base stations 105) or indirectly (e.g., via the core network 130) on the backhaul links 120 (e.g., via X2, Xn, or other interfaces), or both. In some examples, the backhaul links 120 may be or include one or more wireless links.

[0063] One or more of the base stations 105 described herein may include or may be referred to by a person skilled in the art as a base station transceiver, a radio base station, an access point, a radio transceiver, a NodeB, an evolved NodeB (eNodeB, eNB), a next generation NodeB or a Gigabit NodeB (any of which may be referred to as a gNB), a Home NodeB, a Home Evolved NodeB, or other appropriate terms.

[0064] UE 115 may include or may be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other appropriate terminology, where a "device" may also be referred to as a unit, a station, a terminal, or a client, among other examples. UE 115 may also include or may be referred to as a personal electronic device, such as a cellular phone, a personal digital assistant (PDA), a tablet computer, a laptop computer, or a personal computer. In some examples, UE 115 may include or be referred to as a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or a machine type communication (MTC) device, among other examples, which may be implemented in various objects such as appliances, or vehicles, meters, and among other examples.

[0065] The UE 115 described herein may be able to communicate with various types of devices, such as other UEs 115, which may sometimes act as relays, as well as base stations 105 and network devices including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, among other examples, such as Figure 1 shown.

[0066] The UE 115 and the base station 105 can communicate wirelessly with each other via one or more communication links 125 on one or more carriers. The term "carrier" may refer to a set of radio frequency spectrum resources having a defined physical layer structure for supporting the communication link 125. For example, a carrier for the communication link 125 may include a portion of a radio frequency spectrum band (e.g., a bandwidth portion (BWP)) that operates according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR). Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information), control signaling for coordinating operations for the carrier, user data, or other signaling. The wireless communication system 100 may support communication with the UE 115 using carrier aggregation or multi-carrier operation. According to the carrier aggregation configuration, the UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers. Carrier aggregation may be used with both frequency division duplex (FDD) component carriers and time division duplex (TDD) component carriers.

[0067] In some examples (e.g., in a carrier aggregation configuration), a carrier may also have acquisition signaling or control signaling that coordinates operations for other carriers. A carrier may be associated with a frequency channel (e.g., an Evolved Universal Mobile Telecommunications System Terrestrial Radio Access (E-UTRA) Absolute Radio Frequency Channel Number (EARFCN)) and may be placed according to a channel raster for discovery by UE 115. A carrier may operate in a standalone mode, where initial acquisition and connection may be performed by UE 115 via the carrier, or a carrier may operate in a non-standalone mode, where connections are anchored using different carriers (e.g., of the same or different radio access technologies).

[0068] The communication link 125 shown in the wireless communication system 100 may include an uplink transmission from the UE 115 to the base station 105, or a downlink transmission from the base station 105 to the UE 115. A carrier may carry downlink or uplink communications (e.g., in FDD mode) or may be configured to carry both downlink and uplink communications (e.g., in TDD mode).

[0069] A carrier may be associated with a particular bandwidth of a radio frequency spectrum, and in some examples, a carrier bandwidth may be referred to as a "system bandwidth" of a carrier or wireless communication system 100. For example, a carrier bandwidth may be one of a number of determined bandwidths of a carrier for a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 megahertz (MHz)). A device of the wireless communication system 100 (e.g., a base station 105, a UE 115, or both) may have a hardware configuration that supports communication on a particular carrier bandwidth, or may be configurable to support communication on one of a set of carrier bandwidths. In some examples, the wireless communication system 100 may include a base station 105 or a UE 115 that supports simultaneous communication via carriers associated with multiple carrier bandwidths. In some examples, each served UE 115 may be configured to operate on a portion (e.g., a subband, a BWP) or all of a carrier bandwidth.

[0070] The signal waveform transmitted on the carrier may be composed of multiple subcarriers (e.g., using multicarrier modulation (MCM) techniques such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM)). In a system employing MCM techniques, a resource element may include a symbol period (e.g., the duration of a modulation symbol) and a subcarrier, where the symbol period and the subcarrier spacing are inversely related. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both). Therefore, the more resource elements received by the UE 115 and the higher the order of the modulation scheme, the higher the data rate for the UE 115 can be. Wireless communication resources may refer to a combination of radio frequency spectrum resources, time resources, and spatial resources (e.g., spatial layers or beams), and the use of multiple spatial layers may further increase the data rate or data integrity for communication with the UE 115.

[0071] One or more numerologies for a carrier may be supported, where the numerology may include a subcarrier spacing (Δf) and a cyclic prefix. A carrier may be divided into one or more BWPs having the same or different numerologies. In some examples, a UE 115 may be configured with multiple BWPs. In some examples, a single BWP for a carrier may be active at a given time, and communications for a UE 115 may be limited to the one or more active BWPs.

[0072] The time interval for the base station 105 or the UE 115 may be in a basic time unit (which may be referred to as T s =1 / (Δf max ·N f ) seconds sampling period, where Δf max It can indicate the maximum supported subcarrier spacing, and N f The communication resource time intervals may be organized according to radio frames each having a specified duration (e.g., 10 milliseconds (ms)). Each radio frame may be identified by a system frame number (SFN) (e.g., ranging from 0 to 1023).

[0073] Each frame may include a plurality of consecutively numbered subframes or time slots, and each subframe or time slot may have the same duration. In some examples, a frame may be divided into subframes (e.g., in the time domain), and each subframe may be further divided into a number of time slots. Alternatively, each frame may include a variable number of time slots, and the number of time slots may depend on the subcarrier spacing. Each time slot may include a number of symbol periods (e.g., depending on the length of a cyclic prefix added in front of each symbol period). In some wireless communication systems 100, a time slot may be further divided into a plurality of mini-time slots containing one or more symbols. Excluding the cyclic prefix, each symbol period may contain one or more (e.g., N f The duration of a symbol period may depend on the subcarrier spacing or the operating frequency band.

[0074] A subframe, slot, mini-slot, or symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communication system 100, and may be referred to as a transmission time interval (TTI). In some examples, the TTI duration (e.g., the number of symbol periods in a TTI) may be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communication system 100 may be dynamically selected (e.g., in bursts of shortened TTIs (sTTIs)).

[0075] Physical channels may be multiplexed on a carrier according to various techniques. Physical control channels and physical data channels may be multiplexed on a downlink carrier, for example, using one or more of a time division multiplexing (TDM) technique, a frequency division multiplexing (FDM) technique, or a hybrid TDM-FDM technique. A control region (e.g., a control resource set (CORESET)) for a physical control channel may be defined by a number of symbol periods and may extend across a system bandwidth or a subset of a system bandwidth of a carrier. One or more control regions (e.g., CORESETs) may be configured for a group of UEs 115. For example, one or more of the UEs 115 may monitor or search a control region for control information according to one or more search space sets, and each search space set may include one or more control channel candidates at one or more aggregation levels arranged in a cascaded manner. The aggregation level for a control channel candidate may refer to the number of control channel resources (e.g., control channel elements (CCEs)) associated with coding information for a control information format having a given payload size. The search space sets may include a common search space set configured for transmitting control information to multiple UEs 115 and a UE-specific search space set for transmitting control information to a specific UE 115 .

[0076] Each base station 105 can provide communication coverage via one or more cells (e.g., macro cells, small cells, hot spots or other types of cells, or any combination thereof). The term "cell" can refer to a logical communication entity used to communicate with the base station 105 (e.g., on a carrier), and can be associated with an identifier (e.g., a physical cell identifier (PCID), a virtual cell identifier (VCID) or other) used to distinguish adjacent cells. In some examples, a cell can also refer to a geographic coverage area 110 or a portion of a geographic coverage area 110 (e.g., a sector) on which a logical communication entity operates. Depending on various factors (such as the capabilities of the base station 105), such a cell can range from a smaller area (e.g., a structure, a subset of a structure) to a larger area. For example, a cell can be or include a building, a subset of a building, or an external space between or overlapping a geographic coverage area 110, as well as other examples.

[0077] A macro cell typically covers a relatively large geographic area (e.g., a radius of several kilometers), and may allow unrestricted access by a UE 115 with a service subscription to a network provider supporting the macro cell. A small cell may be associated with a lower power base station 105 than a macro cell, and the small cell may operate in the same or different (e.g., licensed, unlicensed) frequency band as the macro cell. A small cell may provide unrestricted access to a UE 115 with a service subscription to a network provider, or may provide restricted access to a UE 115 associated with a small cell (e.g., a UE 115 in a closed subscriber group (CSG), a UE 115 associated with a user in a residence or office). A base station 105 may support one or more cells, and may also support the use of one or more component carriers to communicate on one or more cells.

[0078] In some examples, a carrier can support multiple cells, and different cells can be configured according to different protocol types (e.g., MTC, narrowband IoT (NB-IoT), enhanced mobile broadband (eMBB)) that can provide access to different types of devices.

[0079] In some examples, the base stations 105 may be mobile and, therefore, provide communication coverage for mobile geographic coverage areas 110. In some examples, different geographic coverage areas 110 associated with different technologies may overlap, but the different geographic coverage areas 110 may be supported by the same base station 105. In other examples, overlapping geographic coverage areas 110 associated with different technologies may be supported by different base stations 105. The wireless communication system 100 may include, for example, a heterogeneous network in which different types of base stations 105 provide coverage for respective geographic coverage areas 110 using the same or different radio access technologies.

[0080] The wireless communication system 100 may support synchronous operation or asynchronous operation. For synchronous operation, the base stations 105 may have similar frame timing, and transmissions from different base stations 105 may be approximately aligned in time. For asynchronous operation, the base stations 105 may have different frame timing, and transmissions from different base stations 105 may not be aligned in time in some examples. The techniques described herein may be used for synchronous operation or asynchronous operation.

[0081] Some UEs 115, such as MTC or IoT devices, may be low-cost or low-complexity devices and may provide for automated communication between machines (e.g., via machine-to-machine (M2M) communication). M2M communication or MTC may refer to data communication technology that allows devices to communicate with each other or with a base station 105 without human intervention. In some examples, M2M communication or MTC may include communications from devices that integrate sensors or meters to measure or capture information and relay such information to a central server or application that utilizes the information or presents the information to a human interacting with the application. Some UEs 115 may be designed to collect information or implement automated behavior of machines or other devices. Examples of applications for MTC devices include smart metering, inventory monitoring, water level monitoring, equipment monitoring, healthcare monitoring, wildlife monitoring, climate and geological event monitoring, fleet management and tracking, remote security sensing, physical access control, and transaction-based commercial billing.

[0082] Some UEs 115 may be configured to employ an operating mode that reduces power consumption, such as half-duplex communication (e.g., a mode that supports unidirectional communication via transmission or reception without transmitting and receiving simultaneously). In some examples, half-duplex communication may be performed at a reduced peak rate. Other power saving techniques for UE 115 include entering a power saving deep sleep mode when not engaged in active communications, when operating on a limited bandwidth (e.g., according to narrowband communications), or a combination of these techniques. For example, some UEs 115 may be configured to operate using a narrowband protocol type associated with a defined portion or range (e.g., a set of subcarriers or resource blocks (RBs)) within a carrier, within a guard band of a carrier, or outside a carrier.

[0083] The wireless communication system 100 can be configured to support ultra-reliable communication or low-latency communication, or various combinations thereof. For example, the wireless communication system 100 can be configured to support ultra-reliable low-latency communication (URLLC) or mission-critical communication. UE115 can be designed to support ultra-reliable, low-latency or critical functions (e.g., mission-critical functions). Ultra-reliable communication can include private communication or group communication, and can be supported by one or more mission-critical services (such as mission-critical push-to-talk (MCPTT), mission-critical video (MCVideo), or mission-critical data (MCData). Support for mission-critical functions can include prioritization of services, and mission-critical services can be used for public safety or general commercial applications. The terms ultra-reliable, low-latency, mission-critical, and ultra-reliable low-latency can be used interchangeably in this article.

[0084] In some examples, UE 115 may also be able to communicate directly with other UE 115 on a device-to-device (D2D) communication link 135 (e.g., using a peer-to-peer (P2P) or D2D protocol). One or more UEs 115 utilizing D2D communication may be within a geographic coverage area 110 of a base station 105. Other UEs 115 in such a group may be outside the geographic coverage area 110 of a base station 105 or otherwise unable to receive transmissions from the base station 105. In some examples, groups of UEs 115 communicating via D2D communication may utilize a one-to-many (1:M) system in which each UE 115 transmits to each other UE 115 in the group. In some examples, the base station 105 facilitates the scheduling of resources for D2D communication. In other cases, D2D communication is performed between UEs 115 without involving the base station 105.

[0085] In some systems, the D2D communication link 135 can be an example of a communication channel (such as a sidelink communication channel) between vehicles (e.g., UE 115). In some examples, the vehicle can communicate using vehicle-to-everything (V2X) communication, vehicle-to-vehicle (V2V) communication, or some combination of these items. The vehicle can use signals to transmit information related to traffic conditions, signal scheduling, weather, safety, emergency situations, or any other information related to the V2X system. In some examples, the vehicle in the V2X system can communicate with roadside infrastructure (such as a roadside unit), or communicate with the network via one or more network nodes (e.g., base station 105) using vehicle-to-network (V2N) communication, or communicate with both.

[0086] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connection, and other access, routing or mobility functions. The core network 130 may be an evolved packet core (EPC) or a 5G core (5GC), which may include at least one control plane entity (e.g., a mobility management entity (MME), an access and mobility management function (AMF)) for managing access and mobility and at least one user plane entity (e.g., a serving gateway (S-GW), a packet data network (PDN) gateway (P-GW), or a user plane function (UPF)) for routing packets to an external network or interconnecting to an external network. The control plane entity may manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management for UE 115 served by a base station 105 associated with the core network 130. User IP packets may be transmitted via a user plane entity, which may provide IP address allocation and other functions. The user plane entity may be connected to a network operator IP service 150. Operator IP services 150 may include access to the Internet, an intranet, an IP Multimedia Subsystem (IMS), or packet-switched streaming services.

[0087] Some of the network devices, such as the base station 105, may include subcomponents, such as an access network entity 140, which may be an example of an access node controller (ANC). Each access network entity 140 may communicate with the UE 115 through one or more other access network transport entities 145, which may be referred to as radio heads, smart radio heads, or transmit / receive points (TRPs). Each access network transport entity 145 may include one or more antenna panels. In some configurations, the various functions of each access network entity 140 or base station 105 may be distributed across various network devices (e.g., radio heads and ANCs) or merged into a single network device (e.g., base station 105).

[0088] The wireless communication system 100 may operate using one or more frequency bands, typically in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). Often, the region from 300 MHz to 3 GHz is referred to as the ultra-high frequency (UHF) region or decimeter band because the wavelengths range from approximately one decimeter to one meter in length. UHF waves may be blocked or redirected by buildings and environmental features, but the waves may be sufficient to penetrate structures for macro cells to provide service to UEs 115 located indoors. Transmission of UHF waves may be associated with smaller antennas and shorter distances (e.g., less than 100 kilometers) than transmission of smaller frequencies and longer waves using the high frequency (HF) or very high frequency (VHF) portions of the spectrum below 300 MHz.

[0089] The wireless communication system 100 may also operate in a super high frequency (SHF) region using a frequency band from 3 GHz to 30 GHz (also referred to as a centimeter band) or in an extremely high frequency (EHF) region of the spectrum (e.g., from 30 GHz to 300 GHz) (also referred to as a millimeter band). In some examples, the wireless communication system 100 may support millimeter wave (mmW) communications between the UE 115 and the base station 105, and the EHF antennas of the respective devices may be smaller and more closely spaced than the UHF antennas. In some examples, this may facilitate the use of antenna arrays within the device. However, the propagation of EHF transmissions may suffer from even greater atmospheric attenuation and shorter distances than SHF or UHF transmissions. The technology disclosed herein may be adopted across transmissions using one or more different frequency regions, and the designated use of frequency bands across these frequency regions may differ according to the country or regulatory agency.

[0090] The wireless communication system 100 can utilize both licensed and unlicensed radio frequency spectrum bands. For example, the wireless communication system 100 can employ license assisted access (LAA), LTE unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed band (such as the 5 GHz industrial, scientific, and medical (ISM) band). When operating in an unlicensed radio frequency spectrum band, devices (such as base stations 105 and UEs 115) can employ carrier sensing for conflict detection and avoidance. In some examples, operations in unlicensed bands can be based on a carrier aggregation configuration that is combined with component carriers operating in a licensed band (e.g., LAA). Operations in unlicensed spectrum can include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, as well as other examples.

[0091] The base station 105 or UE 115 may be equipped with multiple antennas, which may be used to employ technologies such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming. The antennas of the base station 105 or UE 115 may be located within one or more antenna arrays or antenna panels (which may support MIMO operations or transmit or receive beamforming). For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly, such as an antenna tower. In some examples, the antennas or antenna arrays associated with the base station 105 may be located at a variety of geographic locations. The base station 105 may have an antenna array having antenna ports of a number of rows and columns that the base station 105 may use to support beamforming for communications with the UE 115. Similarly, the UE 115 may have one or more antenna arrays that may support various MIMO or beamforming operations. Additionally or alternatively, the antenna panel may support radio frequency beamforming for signals sent via the antenna ports.

[0092] The base station 105 or UE 115 can use MIMO communication to exploit multipath signal propagation and improve spectral efficiency by sending or receiving multiple signals via different spatial layers. Such a technology may be referred to as spatial multiplexing. Multiple signals may be, for example, sent by a transmitting device via different antennas or different combinations of antennas. Similarly, multiple signals may be received by a receiving device via different antennas or different combinations of antennas. Each of the multiple signals may be referred to as a separate spatial stream and may carry bits associated with the same data stream (e.g., the same codeword) or different data streams (e.g., different codewords). Different spatial layers may be associated with different antenna ports for channel measurement and reporting. MIMO technology includes single-user MIMO (SU-MIMO) (where multiple spatial layers are sent to the same receiving device) and multi-user MIMO (MU-MIMO) (where multiple spatial layers are sent to multiple devices).

[0093] Beamforming (which may also be referred to as spatial filtering, directional transmission, or directional reception) is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a base station 105, a UE 115) to form or direct an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by combining signals transmitted via antenna elements of an antenna array so that some signals propagating in a particular orientation relative to the antenna array experience constructive interference, while other signals experience destructive interference. Adjustments to signals transmitted via antenna elements may include the transmitting device or the receiving device applying an amplitude offset, a phase offset, or both to signals carried via antenna elements associated with the device. Adjustments associated with each of the antenna elements may be defined by a set of beamforming weights associated with a particular orientation (e.g., relative to the antenna array of the transmitting device or the receiving device, or relative to some other orientation).

[0094] As part of the beamforming operation, the base station 105 or the UE 115 may use beam scanning techniques. For example, the base station 105 may use multiple antennas or antenna arrays (e.g., antenna panels) to perform beamforming operations for directional communications with the UE 115. Some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be sent multiple times by the base station 105 in different directions. For example, the base station 105 may send signals according to different sets of beamforming weights associated with different transmission directions. The transmissions in different beam directions may be used (e.g., by a transmitting device (such as the base station 105) or by a receiving device (such as the UE 115)) to identify a beam direction for subsequent transmission or reception by the base station 105.

[0095] Some signals, such as data signals associated with a particular receiving device, may be sent by base station 105 in a single beam direction, e.g., a direction associated with a receiving device, such as UE 115. In some examples, the beam direction associated with transmissions along a single beam direction may be determined based on signals sent in one or more beam directions. For example, UE 115 may receive one or more of the signals sent by base station 105 in different directions, and may report to base station 105 an indication of the signal received by UE 115 having the highest signal quality or otherwise acceptable signal quality.

[0096] In some examples, transmission by a device (e.g., by a base station 105 or a UE 115) may be performed using multiple beam directions, and the device may use a combination of digital precoding or radio frequency beamforming to generate a combined beam for transmission (e.g., from the base station 105 to the UE 115). The UE 115 may report feedback indicating precoding weights for one or more beam directions, and the feedback may correspond to a configured number of beams across the system bandwidth or one or more subbands. The base station 105 may send a reference signal (e.g., a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS)), which may be precoded or not precoded. The UE 115 may provide feedback for beam selection, which may be a precoding matrix indicator (PMI) or codebook-based feedback (e.g., a multi-panel type codebook, a linear combination type codebook, a port selection type codebook). Although these techniques are described with reference to signals sent by base station 105 in one or more directions, UE 115 may employ similar techniques for sending signals multiple times in different directions (e.g., for identifying a beam direction for subsequent transmission or reception by UE 115) or for sending signals in a single direction (e.g., for sending data to a receiving device).

[0097] A receiving device (e.g., UE 115) may try multiple reception configurations (e.g., directional listening) when receiving various signals (such as synchronization signals, reference signals, beam selection signals, or other control signals) from base station 105. For example, the receiving device may try multiple reception directions by receiving via different antenna subarrays, by processing received signals according to different antenna subarrays, by receiving according to different sets of receive beamforming weights applied to signals received at multiple antenna elements of an antenna array (e.g., different sets of directional listening weights), or by processing received signals according to different sets of receive beamforming weights applied to signals received at multiple antenna elements of an antenna array (any of the above operations may be referred to as "listening" according to different reception configurations or reception directions). In some examples, the receiving device may use a single reception configuration to receive along a single beam direction (e.g., when receiving a data signal). A single receive configuration may be aligned on a beam direction determined based on listening according to different receive configuration directions (e.g., a beam direction determined to have the highest signal strength, the highest signal-to-noise ratio (SNR), or otherwise acceptable signal quality based on listening according to multiple beam directions).

[0098] The wireless communication system 100 may be a packet-based network that operates according to a layered protocol stack. In the user plane, the communication at the bearer or packet data convergence protocol (PDCP) layer may be IP-based. The radio link control (RLC) layer may perform packet segmentation and reassembly for transmission on a logical channel. The medium access control (MAC) layer may perform priority processing and multiplexing of logical channels to transport channels. The MAC layer may also support retransmission at the MAC layer using error detection techniques, error correction techniques, or both to improve link efficiency. In the control plane, the radio resource control (RRC) protocol layer may provide for the establishment, configuration, and maintenance of an RRC connection that supports radio bearers for user plane data between UE 115 and base station 105 or core network 130. At the physical layer, transport channels may be mapped to physical channels.

[0099] UE 115 and base station 105 can support retransmission of data to increase the possibility that the data is successfully received. Hybrid automatic repeat request (HARQ) feedback is a technology for increasing the possibility that data is correctly received on communication link 125. HARQ can include a combination of error detection (e.g., using cyclic redundancy check (CRC)), forward error correction (FEC) and retransmission (e.g., automatic repeat request (ARQ)). HARQ can improve the throughput at the MAC layer under poor radio conditions (e.g., low signal and noise conditions). In some examples, the device can support the same time slot HARQ feedback, wherein the device can provide HARQ feedback for data received in the previous symbol in the time slot in a specific time slot. In other cases, the device can provide HARQ feedback in subsequent time slots or according to some other time interval.

[0100] The wireless communication system 100 can support sidelink communication. In some cases, the base station 105 can allocate resources for the sidelink communication between UE 115, but the base station 105 may not know the intended receiver of the permitted sidelink resources, which may cause a half-duplex scheduling conflict at one UE 115 in the UE 115. The UE 115 and the base station 105 described herein can implement a technology for coordinated sidelink resource allocation to avoid half-duplex scheduling conflicts. The first UE 115 scheduled to send both sidelink communication and receive sidelink communication can detect the possibility of scheduling conflicts or scheduling conflicts, and warn the serving cell of the conflict. The first UE 115 can then be rescheduled for its sidelink transmission to avoid scheduling conflicts. In some cases, the first UE 115 can receive sidelink control information (e.g., using the upcoming sidelink transmission to the first UE 115) from the second UE 115, wherein the sidelink control information includes an indicator of the serving cell. The first UE 115 may then apply techniques to avoid half-duplex scheduling conflicts based on whether the second UE 115 has the same or different serving cell. For example, the first UE 115 may request permission to reconfigure, or the first UE 115 may report a destination identifier to the serving cell to avoid scheduling conflicts.

[0101] Figure 2 An example of a wireless communication system 200 that supports coordinated sidelink resource allocation in accordance with aspects of the present disclosure is shown. In some examples, the wireless communication system 200 can implement aspects of the wireless communication system 100. The wireless communication system 2000 may include a base station 105-a, which may be an example of a base station 105 described herein. The wireless communication system 2000 may include a UE 115-a, a UE 115-b, and a UE 115-c, which may each be an example of a UE 115 described herein.

[0102] The wireless communication system 200 may support sidelink communications. For example, UE 115-a and UE 115-b may communicate on the sidelink 205-a. In some cases, the wireless communication system 200 may be an example of a V2X system, where UE 115-a, 115-b, and 115-c may be vehicle UEs, pedestrian UEs, relay devices, or a combination thereof.

[0103] In some cases, UE 115 may operate according to half-duplex constraints. For example, to save power, UE 115 may transmit on sidelink 205 or receive on sidelink 205, but UE 115 may not transmit and receive at the same time. This may provide power savings for D2D devices or V2X devices, resulting in longer life without having to replace these devices.

[0104] Sidelink resource assignments may generally be handled according to one of two modes. In the first mode, UEs 115 participating in sidelink communications may autonomously select time and frequency resources for sidelink communications. In the second mode, base station 105-a may allocate resources for sidelink communications between UEs 115. For example, UE 115-a may send a BSR 210 to base station 105-a on an uplink 215 to request resources, and base station 105-a may send a sidelink grant 220 with resource allocations for sidelink transmissions on sidelink 205-a on a downlink 225. BSR 210 may provide information to the serving base station 105 about the amount of sidelink data for a logical channel ID to each destination ID.

[0105] In some cases, if base station 105-a allocates resources for sidelink communications, base station 105-a may not be aware of the intended receiver of the granted sidelink resources. For example, base station 105-a may grant sidelink resources to UE 115-a, but base station 105-a may not be aware that the recipient of the transmission from UE 115-a (e.g., UE 115-b) has been granted sidelink resources for transmission at the same time. As a result, UE 115-b may be scheduled to simultaneously transmit to UE 115-c on sidelink 205-b and receive from UE 115-a on sidelink 205-a, which may not comply with the half-duplex constraint and result in a scheduling conflict.

[0106] The techniques herein describe coordinated sidelink resource allocation to avoid half-duplex scheduling conflicts. UE 115-b may detect a scheduling conflict or the possibility of a scheduling conflict, and alert the serving cell of the conflict. UE 115-b may then be rescheduled for sidelink transmissions to UE 115-c to avoid scheduling conflicts. In some cases, UE 115-b may receive sidelink control information including an indicator of a serving cell (e.g., corresponding to base station 105-a) from UE 115-a. In some cases, UE 115-b may apply techniques to avoid half-duplex scheduling conflicts based on whether UE 115-a has the same or different serving cells.

[0107] In some cases, UE 115-b may determine that UE 115-a has the same serving cell. For example, base station 105-a may serve UE 115-b and UE 115-a. Upon decoding the sidelink control information from UE 115-a, UE 115-b may report a destination identifier to base station 105-a in the sidelink assistance information. In this example, UE 115-b may send a destination identifier to base station 105-a, indicating that UE 115-b is the intended recipient of the sidelink transmission from UE 115-b. Based on the destination identifier, base station 105-a may know the potential destination identifiers on which UE 115-b will receive sidelink data. Base station 105-b may then schedule the sidelink transmission from UE 115-b to avoid half-duplex scheduling conflicts.

[0108] In some cases, UE 115-b may determine that UE 115-a has a different serving cell. For example, UE 115-b may be served by base station 105-b. In this example, upon receiving a sidelink grant from UE 115-a or from base station 105-b, UE 115-b may send a request 235 for grant reconfiguration to base station 105-b. UE 115-b may then receive a reconfigured grant 230 with different resource allocations to avoid half-duplex scheduling conflicts. In some cases, UE 115-b may include a time bitmap of time slots in which UE 115-b has a half-duplex conflict. In some cases, request 235 may be sent as part of feedback for the original sidelink grant. Base station 105-b may consider the priority of the packet causing the half-duplex conflict when reconfiguring the grant. For example, base station 105-b may avoid increasing the delay of high priority packets when rescheduling UE 115-b. In some cases, base station 105-b may indicate a conflict to base station 105-a (e.g., on a backhaul link), and base station 105-a may reschedule UE 115-a. In some cases, UE 115-b may determine to discard one or more of the sidelink transmissions to receive other sidelink transmissions if the discarded sidelink transmissions have a lower priority.

[0109] In some cases, if the first UE and the second UE have the same serving cell, UE 115-b may request a grant reconfiguration. For example, the technique of reconfiguring the sidelink grant may be applicable to both intra-cell scenarios and inter-cell scenarios (e.g., as described in reference to Figure 3 described).

[0110] Additional techniques for configuring a coordination scheme are described herein so that UE 115-b can determine when to request reconfiguration and when to indicate a destination identifier. For example, UE 115-a can indicate a serving cell identifier to UE 115-b in an SCI. UE 115-b receives the SCI and checks to see if UE 115-a has the same serving cell as UE 115-b. If the serving cells are the same, and UE 115-b is interested in receiving transmissions from UE 115-a, UE 115-b can indicate an L2 destination identifier to the serving cell of UE 115-b. This can prevent UE 115-b from being scheduled for half-duplex conflicts. If the serving cell indicated by UE 115-a is different from the serving cell of UE 115-b, UE 115-b can send a grant reconfiguration request to the serving cell of UE 115-b to avoid half-duplex conflicts. In some cases, UE 115-a may send an indicator of the serving cell, such as a few least significant bits of a serving cell identifier.

[0111] Techniques for coordinating sidelink resource allocation can be configured. For example, whether to trigger a UE coordination scheme to avoid half-duplex conflicts by implementing any one or more of the techniques described above can be controlled by configuration. In some cases, the coordination scheme can be configured by higher layer signaling (such as RRC signaling). In some cases, the coordination scheme can be configured by SCI or downlink control information (e.g., for carrying sidelink grants). In some cases, the configuration can be based on packet priority levels. For example, a sidelink resource allocation coordination scheme can ensure that high priority packets are sent and received without half-duplex conflicts.

[0112] Figure 3 An example of an intra-cell configuration 300 and an inter-cell configuration 301 that supports coordinated sidelink resource allocation according to aspects of the present disclosure is shown. In some examples, the intra-cell configuration 300 and the inter-cell configuration 301 can implement aspects of the wireless communication system 100. The intra-cell configuration 300 and the inter-cell configuration 301 can include a base station 105-a, a UE 115-a, a UE 115-b, and a UE 115-c, which can be respective examples of a base station 105 or a UE 115 as described herein. The inter-cell configuration 301 can include a base station 105-b, which can be an example of a base station 105 as described herein.

[0113] The UE 115 may communicate with the serving base station 105 via the Uu interface 305. The UE 115 may communicate with each other via the sidelink via the sidelink interface 310. The base stations 105 may provide cells, wherein UEs 115 within the coverage area of ​​the cells are served by the corresponding base stations 105. For example, the base station 105-a may provide a first cell 315, and the base station 105-b may provide a second cell 320.

[0114] In the intra-cell configuration 300, the base station 105-a can serve the UE 115-a and the UE 115-b. According to the techniques described herein, the UE 115-a, the UE 115-b, and the base station 105-a can implement techniques in the intra-cell configuration 300 to avoid half-duplex conflicts at the UE 115-b. For example, the UE 115-b can avoid being scheduled for half-duplex conflicts by reporting a destination identifier to the base station 105-a in the sidelink assistance information so that the base station 105-a knows the potential destination identifiers on which the UE 115-b will receive sidelink data. The base station 105-a can accordingly schedule the UE 115-b for sidelink transmissions to the UE 115-c to avoid half-duplex conflicts. In some cases, the intra-cell configuration 300 may implement techniques in which the UE 115-b receives a grant from the base station 105-a that causes a half-duplex conflict. To avoid half-duplex collisions, UE 115-b may send a request for a grant to be reconfigured and for UE 115-b to reassign resources for sidelink transmissions to UE 115-c.

[0115] In the inter-cell configuration 301, the base station 105-a can serve the UE 115-a, and the base station 105-b can serve the UE 115-b. According to the technology described in this article, the UE 115-a, the UE 115-b and the base station 105-a can implement the technology for avoiding half-duplex conflicts at the UE 115-b in the inter-cell configuration 301. For example, the UE 115-b can receive a grant from the base station 105-b to allocate resources for sidelink transmissions to the UE 115-c. The UE 115-b can also simultaneously receive an SCI from the UE 115-a indicating the sidelink transmission to the UE 115-b. The UE 115-a can include a serving cell identifier in the sidelink control information, and the UE 115-b can check whether the UE 115-a has the same serving cell. The UE 115-b can determine that the UE 115-a has a different serving cell. UE 115-b may send a request to base station 105-b for a grant to be reconfigured and for UE 115-b to reassign resources for sidelink transmissions to UE 115-c.

[0116] Figure 4 An example of a process flow 400 for supporting coordinated sidelink resource allocation in accordance with aspects of the present disclosure is shown. In some examples, the process flow 400 can implement aspects of the wireless communication system 100. The process flow 400 can include a base station 105-a, a UE 115-a, a UE 115-b, and a UE 115-c, which can be respective examples of a base station 105 or a UE 115 as described herein. The base station 105-a can serve the UE 115-a and the UE 115-b.

[0117] At 405, UE 115-a may send a BSR to base station 105-a for a sidelink transmission to UE 115-b. At 410, UE 115-b may send a BSR to base station 105-a for a sidelink transmission to a device (e.g., a third UE 115 not shown). At 415, UE 115-a may receive a grant from base station 105-a for a sidelink transmission to UE 115-b during the time resource based on sending a buffer status report. At 420, UE 115-a may send an SCI to UE 115-b, the SCI including an indication of the sidelink transmission during the time resource and an indication of a serving cell identifier for UE 115-a.

[0118] UE 115-b may check the serving cell identifier of UE 115-a using its own serving cell identifier.At 425, UE 115-b may determine that the serving cell identifier of UE 115-a matches the serving cell identifier of UE 115-b.

[0119] At 430, UE 115-b may send an indicator of a destination identifier to base station 105-a based on a matching of a serving cell identifier for UE 115-a with a serving cell identifier for UE 115-b. For example, UE 115-b may let base station 105-a know that UE 115-b is an intended receiver for destination {Layer2-ID1, Layer2-ID2}. Base station 105-a may determine that it has granted a grant for transmission to destination Layer2-ID1. Then, when UE 115-b requests transmission resources (e.g., using destination Layer2-ID3 where the device is one of its intended receivers), base station 105-a grants appropriate resources to UE 115-b, such as to avoid the same timeslot as the grant given to UE 115-a.

[0120] For example, UE 115-b indicates that it is the intended receiver of the sidelink transmission from UE 115-a. Base station 105-a also receives a request for resources from UE 115-b, and base station 105-a can allocate resources to UE 115-b while avoiding half-duplex scheduling conflicts for UE 115-b.

[0121] At 435, UE 115-b may receive a grant from base station 105-a for a sidelink transmission to a third UE 115 within a different time resource than the second sidelink transmission.

[0122] At 440, UE 115-a may send a sidelink transmission to UE 115-b. At 445, UE 115-b may send a sidelink transmission to a third UE 115 during a different time resource.

[0123] Figure 5 An example of a process flow 500 for supporting coordinated sidelink resource allocation in accordance with aspects of the present disclosure is shown. In some examples, the process flow 500 can implement aspects of the wireless communication system 100. The process flow 500 can include a base station 105-b, a UE 115-a, a UE 115-b, and a UE 115-c, which can be respective examples of a base station 105 or a UE 115 as described herein. The base station 105-b can serve the UE 115-b. The UE 115-a can be served by a different base station 105 in some cases.

[0124] At 505, UE 115-b may send a BSR to base station 105-b for a first sidelink transmission to the device. In some cases, the device may be a third UE 115, not shown. At 510, UE 115-b may receive an SCI from UE 115-a that schedules UE 115-b for time resources for a second sidelink transmission from UE 115-a. The sidelink control information may include an indication of a serving cell identifier for UE 115-a.

[0125] At 515, UE 115-b may determine that the serving cell identifier for UE 115-a does not match the serving cell identifier for UE 115-b. Therefore, UE 115-a and UE 115-b may have different serving cells.

[0126] At 520, UE 115-b may receive a grant from base station 105-b to schedule time resources for a first sidelink transmission, wherein both the first sidelink transmission and the second sidelink transmission are scheduled for time resources corresponding to a half-duplex scheduling conflict for UE 115-b. UE 115-b may operate in accordance with a half-duplex constraint, wherein UE 115-b may not be able to transmit and receive on the sidelink simultaneously.

[0127] To resolve the half-duplex conflict, UE 115-b may send a request to base station 105-b for a reconfiguration grant for a first sidelink transmission for UE 115-b based on the half-duplex scheduling conflict at 525. At 530, UE 115-b may receive a grant for reconfiguration to schedule UE 115-b for a different time resource than the second sidelink transmission.

[0128] At 535, UE 115-b may receive a second sidelink transmission from UE 115-a during the time resource. At 540, UE 115-b may send a first sidelink transmission to the device during a different time resource.

[0129] Figure 6 A block diagram 600 of a device 605 supporting coordinated sidelink resource allocation according to aspects of the present disclosure is shown. The device 605 may be an example of aspects of a UE 115 as described herein. The device 605 may include a receiver 610, a communication manager 615, and a transmitter 620. The device 605 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0130] The receiver 610 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to coordinated sidelink resource allocations, etc.). The information may be communicated to other components of the device 605. The receiver 610 may be a reference Fig. 9 Examples of various aspects of the transceiver 920 are described. The receiver 610 may utilize a single antenna or a group of antennas.

[0131] The communication manager 615 may send a buffer status report for a first sidelink transmission to the device to the base station; and receive sidelink control information from the second UE, the sidelink control information scheduling the first UE for a time resource for a second sidelink transmission from the second UE, the sidelink control information including an indication of a serving cell identifier of the second UE. The communication manager 615 may also send a buffer status report for a sidelink transmission to the first UE to the base station; receive a grant for a sidelink transmission during the time resource from the base station based on sending the buffer status report; and send sidelink control information to the first UE, the sidelink control information including an indication of a sidelink transmission during the time resource and an indication of a serving cell identifier. The communication manager 615 may be an example of aspects of the communication manager 910 described herein.

[0132] The communication manager 615 or its subcomponents may be implemented in hardware, in code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 615 or its subcomponents may be performed by a general purpose processor, a DSP, an application specific integrated circuit (ASIC), an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.

[0133] The communication manager 615 or its subcomponents can be physically located at various locations, including being distributed so that parts of the functions are implemented by one or more physical components at different physical locations. In some examples, according to various aspects of the present disclosure, the communication manager 615 or its subcomponents can be separate and distinct components. In some examples, according to various aspects of the present disclosure, the communication manager 615 or its subcomponents can be combined with one or more other hardware components (including but not limited to input / output (I / O) components, transceivers, network servers, another computing device, one or more other components described in the present disclosure, or combinations thereof).

[0134] The operations performed by the UE communication manager 615 as described herein may be performed to achieve one or more potential advantages. An implementation may allow the UE 115 to improve throughput by avoiding half-duplex scheduling conflicts. If these scheduling conflicts are not avoided, the UE 115 will drop one or both of the transmissions because the UE 115 is not configured to transmit and receive simultaneously. This may further improve power performance at the UE 115 because the UE 115 may expend less energy to schedule and send or receive retransmissions of dropped sidelink communications.

[0135] The transmitter 620 can transmit signals generated by other components of the device 605. In some examples, the transmitter 620 can be co-located with the receiver 610 in a transceiver module. For example, the transmitter 620 can be a reference Fig. 9 Examples of various aspects of the transceiver 920 are described. The transmitter 620 may utilize a single antenna or a group of antennas.

[0136] Figure 7 A block diagram 700 of a device 705 supporting coordinated sidelink resource allocation according to aspects of the present disclosure is shown. The device 705 may be an example of aspects of the device 605 or UE 115 as described herein. The device 705 may include a receiver 710, a communication manager 715, and a transmitter 740. The device 705 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0137] The receiver 710 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to coordinated sidelink resource allocations, etc.). The information may be communicated to other components of the device 705. The receiver 710 may be a reference Fig. 9 Examples of various aspects of the transceiver 920 are described. The receiver 710 may utilize a single antenna or a group of antennas.

[0138] Communications manager 715 may be an example of aspects of communications manager 615 as described herein. Communications manager 715 may include BSR sending component 720, SCI receiving component 725, sidelink grant receiving component 730, and SCI sending component 735. Communications manager 715 may be an example of aspects of communications manager 910 as described herein.

[0139] BSR transmitting component 720 can transmit, to the base station, a buffer status report for the first sidelink transmission to the device.

[0140] The SCI receiving component 725 can receive sidelink control information from the second UE, the sidelink control information scheduling the first UE for time resources for a second sidelink transmission from the second UE, the sidelink control information including an indication of a serving cell identifier of the second UE.

[0141] BSR transmitting component 720 can transmit a buffer status report for the sidelink transmission to the first UE to the base station.

[0142] Sidelink grant receiving component 730 can receive a grant from a base station for a sidelink transmission during a time resource based on sending a buffer status report.

[0143] The SCI transmitting component 735 may transmit sidelink control information to the first UE, the sidelink control information comprising an indication of a sidelink transmission during the time resource and an indication of a serving cell identifier.

[0144] The transmitter 740 can transmit signals generated by other components of the device 705. In some examples, the transmitter 740 can be co-located with the receiver 710 in a transceiver module. For example, the transmitter 740 can be a reference Fig. 9 Examples of various aspects of the transceiver 920 are described. The transmitter 740 may utilize a single antenna or a group of antennas.

[0145] Figure 8 A block diagram 800 of a communication manager 805 supporting coordinated sidelink resource allocation in accordance with aspects of the present disclosure is shown. The communication manager 805 can be an example of aspects of the communication manager 615, the communication manager 715, or the communication manager 910 described herein. The communication manager 805 can include a BSR sending component 810, an SCI receiving component 815, a sidelink grant reconfiguration component 820, a destination identifier indicating component 825, a sidelink priority component 830, a scheduling configuration component 835, a sidelink grant receiving component 840, and an SCI sending component 845. Each of these modules can be in communication with each other directly or indirectly (e.g., via one or more buses).

[0146] The BSR sending component 810 can send a buffer status report for a first sidelink transmission to the device to the base station. In some examples, the BSR sending component 810 can send a buffer status report for a sidelink transmission to the first UE to the base station. The SCI receiving component 815 can receive sidelink control information from the second UE, the sidelink control information scheduling the first UE for a time resource for a second sidelink transmission from the second UE, the sidelink control information including an indication of a serving cell identifier of the second UE.

[0147] In some cases, the first sidelink transmission, the second sidelink transmission, or both are sent via the PC5 interface. In some cases, the indication of the serving cell identifier corresponds to one or more least significant bits of the serving cell identifier of the second UE. The sidelink grant receiving component 840 can receive a grant for the sidelink transmission during the time resource from the base station based on the send buffer status report. The SCI sending component 845 can send sidelink control information to the first UE, the sidelink control information including an indication of the sidelink transmission during the time resource and an indication of the serving cell identifier.

[0148] In some examples, the SCI transmitting component 845 can transmit a sidelink transmission to the first UE during the time resource. In some cases, the sidelink transmission is transmitted via the PC5 interface. In some cases, the indication of the serving cell identifier corresponds to one or more least significant bits of the serving cell identifier.

[0149] The sidelink grant reconfiguration component 820 can receive a grant from a base station to schedule a time resource for a first sidelink transmission, wherein both the first sidelink transmission and the second sidelink transmission are scheduled for a time resource corresponding to a half-duplex scheduling conflict for the first UE. In some examples, the sidelink grant reconfiguration component 820 can send a request to the base station to reconfigure the grant for the first sidelink transmission for the first UE based on the half-duplex scheduling conflict. In some examples, the sidelink grant reconfiguration component 820 can receive a grant from the base station to reconfigure the first UE to schedule a different time resource than the second sidelink transmission.

[0150] In some examples, sidelink grant reconfiguration component 820 can determine that a serving cell identifier for the second UE does not match a serving cell identifier for the first UE, wherein the request to reconfigure the grant is sent based on the determination. In some examples, the request to reconfigure the grant is sent using feedback of a grant for scheduling time resources for the first sidelink transmission. In some examples, sidelink grant reconfiguration component 820 can determine that a serving cell identifier for the second UE does not match a serving cell identifier for the first UE.

[0151] In some examples, the sidelink grant reconfiguration component 820 can receive a grant for reconfiguration of the sidelink transmission from the base station, wherein the reconfigured grant is based on sending a sidelink control information including an indication of a serving cell identifier to schedule the sidelink transmission for different time resources. In some cases, the request for reconfiguration of the grant includes a bitmap of time slots corresponding to a half-duplex scheduling conflict set, and the half-duplex scheduling conflict set includes at least the half-duplex scheduling conflict. In some cases, the request for reconfiguration of the grant is sent based on receiving the sidelink control information, receiving a grant to schedule the first sidelink transmission, or both. In some cases, the request for reconfiguration of the grant is based on the priority of the first sidelink transmission, the second sidelink transmission, or both.

[0152] The destination identifier indicating component 825 may determine that the serving cell identifier for the second UE matches the serving cell identifier for the first UE. In some examples, the destination identifier indicating component 825 may send an indicator of the destination identifier to the base station based on the serving cell identifier for the second UE matching the serving cell identifier for the first UE. In some examples, the destination identifier indicating component 825 may receive a grant for a first sidelink transmission from the base station, the grant scheduling the first UE for a different time resource than the second sidelink transmission. In some examples, the destination identifier indicating component 825 may receive a second sidelink transmission from the second UE during the time resource. In some examples, the destination identifier indicating component 825 may send the first sidelink transmission during different time resources.

[0153] The sidelink priority component 830 can determine that the first sidelink transmission is scheduled for a time resource with the second sidelink transmission. In some examples, the sidelink priority component 830 can determine that the first sidelink transmission has a higher priority than the second sidelink transmission. In some examples, the sidelink priority component 830 can discard the second sidelink transmission based on the higher priority. In some examples, the sidelink priority component 830 can receive the first sidelink transmission.

[0154] Scheduling configuration component 835 can receive a configuration for avoiding half-duplex scheduling conflicts, wherein the first sidelink transmission and the second sidelink transmission are scheduled for half-duplex scheduling conflicts. In some examples, scheduling configuration component 835 can send a configuration for avoiding half-duplex scheduling conflicts to the first UE via sidelink control information. In some cases, the configuration for avoiding half-duplex scheduling conflicts is received by higher layer signaling, sidelink control information, downlink control information including sidelink grants, or a combination thereof. In some cases, the configuration for avoiding half-duplex scheduling conflicts is based on the first priority of the first sidelink transmission, the second priority of the second sidelink transmission, or both.

[0155] Fig. 9A schematic diagram of a system 900 including a device 905 supporting coordinated sidelink resource allocation according to aspects of the present disclosure is shown. The device 905 may be an example of or include a component of a device 605, a device 705, or a UE 115 as described herein. The device 905 may include components for two-way voice and data communications, including components for sending and receiving communications, including a communication manager 910, an I / O controller 915, a transceiver 920, an antenna 925, a memory 930, and a processor 940. These components may communicate electronically via one or more buses (e.g., a bus 945).

[0156] The communication manager 910 may send a buffer status report for a first sidelink transmission to the device to the base station; and receive sidelink control information from the second UE, the sidelink control information scheduling the first UE for a time resource for a second sidelink transmission from the second UE, the sidelink control information including an indication of a serving cell identifier of the second UE. The communication manager 910 may also send a buffer status report for a sidelink transmission to the first UE to the base station; receive a grant for a sidelink transmission during the time resource from the base station based on sending the buffer status report; and send sidelink control information to the first UE, the sidelink control information including an indication of the sidelink transmission during the time resource and an indication of the serving cell identifier.

[0157] I / O controller 915 may manage input and output signals for device 905. I / O controller 915 may also manage peripheral devices that are not integrated into device 905. In some cases, I / O controller 915 may represent a physical connection or port to an external peripheral device. In some cases, I / O controller 915 may utilize operating systems such as: 905. In some cases, the I / O controller 915 may be implemented as part of a processor. In some cases, a user may interact with the device 905 via the I / O controller 915 or via hardware components controlled by the I / O controller 915.

[0158] The transceiver 920 may communicate bidirectionally via one or more antennas, wired or wireless links as described above. For example, the transceiver 920 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 920 may also include a modem to modulate packets and provide the modulated packets to an antenna for transmission, and demodulate packets received from an antenna.

[0159] In some cases, a wireless device may include a single antenna 925. However, in some cases, a device may have more than one antenna 925, which may be capable of sending or receiving multiple wireless transmissions simultaneously.

[0160] The memory 930 may include RAM and ROM. The memory 930 may store computer-readable, computer-executable code 935, which includes instructions that, when executed, cause the processor to perform various functions described herein. In some cases, among other things, the memory 930 may contain a BIOS that may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0161] The processor 940 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, the processor 940 may be configured to operate a memory array using a memory controller. In other cases, the memory controller may be integrated into the processor 940. The processor 940 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 930) to cause the device 905 to perform various functions (e.g., functions or tasks that support coordinated sidelink resource allocation).

[0162] The code 935 may include instructions for implementing various aspects of the present disclosure, including instructions for supporting wireless communications. The code 935 may be stored in a non-transitory computer-readable medium such as a system memory or other type of memory. In some cases, the code 935 may not be directly executable by the processor 940, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0163] Fig.10A block diagram 1000 of a device 1005 supporting coordinated sidelink resource allocation according to aspects of the present disclosure is shown. The device 1005 can be an example of aspects of a base station 105 as described herein. The device 1005 can include a receiver 1010, a communication manager 1015, and a transmitter 1020. The device 1005 can also include a processor. Each of these components can communicate with each other (e.g., via one or more buses).

[0164] The receiver 1010 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to coordinated sidelink resource allocations, etc.). The information may be communicated to other components of the device 1005. The receiver 1010 may be a reference Fig.13 Examples of various aspects of the transceiver 1320 are described. The receiver 1010 may utilize a single antenna or a group of antennas.

[0165] The communication manager 1015 may receive from the first UE a first buffer status report corresponding to a first sidelink transmission to the device; and receive from the first UE an indicator of a half-duplex scheduling conflict for the first UE based on the first sidelink transmission from the first UE to the device and the second sidelink transmission from the second UE to the first UE. The communication manager 1015 may be an example of aspects of the communication manager 1310 described herein.

[0166] The communication manager 1015 or its subcomponents may be implemented in hardware, in code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 615 or its subcomponents may be performed by a general purpose processor, a DSP, an application specific integrated circuit (ASIC), an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.

[0167] The communication manager 1015 or its subcomponents can be physically located at various locations, including being distributed so that parts of the functionality are implemented by one or more physical components at different physical locations. In some examples, according to various aspects of the present disclosure, the communication manager 1015 or its subcomponents can be separate and distinct components. In some examples, according to various aspects of the present disclosure, the communication manager 1015 or its subcomponents can be combined with one or more other hardware components (including but not limited to input / output (I / O) components, transceivers, network servers, another computing device, one or more other components described in the present disclosure, or combinations thereof).

[0168] The transmitter 1020 can transmit signals generated by other components of the device 1005. In some examples, the transmitter 1020 can be co-located with the receiver 1010 in a transceiver module. For example, the transmitter 1020 can be a reference Fig.13 Examples of various aspects of the transceiver 1320 are described. The transmitter 1020 may utilize a single antenna or a group of antennas.

[0169] Fig.11 A block diagram 1100 of a device 1105 supporting coordinated sidelink resource allocation according to aspects of the present disclosure is shown. The device 1105 may be an example of aspects of the device 1005 or base station 105 as described herein. The device 1105 may include a receiver 1110, a communication manager 1115, and a transmitter 1130. The device 1105 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0170] The receiver 1110 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to coordinated sidelink resource allocations, etc.). The information may be communicated to other components of the device 1105. The receiver 1110 may be a reference Fig.13 Examples of various aspects of the transceiver 1320 are described. The receiver 1110 may utilize a single antenna or a group of antennas.

[0171] The communications manager 1115 may be an example of aspects of the communications manager 1015 as described herein. The communications manager 1115 may include a BSR receiving component 1120 and a scheduling conflict indication receiving component 1125. The communications manager 1115 may be an example of aspects of the communications manager 1310 as described herein.

[0172] The BSR receiving component 1120 can receive a first buffer status report from a first UE corresponding to a first sidelink transmission to the device.

[0173] The scheduling conflict indication receiving component 1125 can receive an indicator of a half-duplex scheduling conflict for the first UE from the first UE based on a first sidelink transmission from the first UE to the device and a second sidelink transmission from the second UE to the first UE.

[0174] The transmitter 1130 may transmit signals generated by other components of the device 1105. In some examples, the transmitter 1130 may be co-located with the receiver 1110 in a transceiver module. For example, the transmitter 1130 may be a reference Fig.13 Examples of various aspects of the transceiver 1320 are described. The transmitter 1130 may utilize a single antenna or a group of antennas.

[0175] Fig.12 A block diagram 1200 of a communication manager 1205 supporting coordinated sidelink resource allocation in accordance with aspects of the present disclosure is shown. The communication manager 1205 can be an example of aspects of the communication manager 1015, the communication manager 1115, or the communication manager 1310 described herein. The communication manager 1205 can include a BSR receiving component 1210, a scheduling conflict indication receiving component 1215, a sidelink grant reconfiguration component 1220, a destination identifier indicating component 1225, and a scheduling configuration component 1230. Each of these modules can be in communication with each other directly or indirectly (e.g., via one or more buses).

[0176] The BSR receiving component 1210 can receive a first buffer status report corresponding to a first sidelink transmission to the device from the first UE. The scheduling conflict indication receiving component 1215 can receive an indicator of a half-duplex scheduling conflict for the first UE from the first UE based on the first sidelink transmission from the first UE to the device and the second sidelink transmission from the second UE to the first UE. In some cases, the first sidelink transmission, the second sidelink transmission, or both are sent via the PC5 interface.

[0177] The sidelink grant reconfiguration component 1220 may send a grant for scheduling time resources for a first sidelink transmission to the first UE. In some examples, the sidelink grant reconfiguration component 1220 may receive a request from the first UE to reconfigure the grant for the first sidelink transmission based on a half-duplex scheduling conflict. In some examples, the sidelink grant reconfiguration component 1220 may send a grant for reconfiguration of the first sidelink transmission to the first UE based on the request and the half-duplex scheduling conflict. In some cases, the indicator includes a bitmap of time slots corresponding to a half-duplex scheduling conflict set for the first UE, and the half-duplex scheduling conflict set includes at least the half-duplex scheduling conflict. In some cases, the request for reconfiguration of the grant is received using feedback for the grant for the first sidelink transmission.

[0178] The destination identifier indicating component 1225 may receive a second buffer status report from the second UE. In some examples, the destination identifier indicating component 1225 may send a second grant for a second sidelink transmission to the second UE based on receiving the second buffer status report. In some examples, the destination identifier indicating component 1225 may receive an indicator of a destination identifier from the first UE based on the second UE and the first UE having a matching serving cell identifier. In some examples, the destination identifier indicating component 1225 may send a grant for the first sidelink transmission to the first UE based on the indicator of the destination identifier, the grant scheduling the first UE for a different time resource than the second sidelink transmission.

[0179] Scheduling configuration component 1230 can send a configuration for avoiding half-duplex scheduling conflicts via higher layer signaling, downlink control information including sidelink grants, or both. In some cases, the configuration for avoiding half-duplex scheduling conflicts is based on a first priority for the first sidelink transmission, a second priority for the second sidelink transmission, or both.

[0180] Fig.13 A schematic diagram of a system 1300 including a device 1305 supporting coordinated sidelink resource allocation according to aspects of the present disclosure is shown. The device 1305 may be an example of or include components of the device 1005, device 1105, or base station 105 as described herein. The device 1305 may include components for two-way voice and data communications, including components for sending and receiving communications, including a communication manager 1310, a network communication manager 1315, a transceiver 1320, an antenna 1325, a memory 1330, a processor 1340, and an inter-station communication manager 1345. These components may communicate electronically via one or more buses (e.g., bus 1350).

[0181] The communication manager 1310 may receive a first buffer status report corresponding to a first sidelink transmission to the device from the first UE; and receive an indicator of a half-duplex scheduling conflict for the first UE from the first UE based on the first sidelink transmission from the first UE to the device and the second sidelink transmission from the second UE to the first UE.

[0182] The network communications manager 1315 may manage communications with the core network (eg, via one or more wired backhaul links). For example, the network communications manager 1315 may manage the delivery of data communications for client devices, such as one or more UEs 115.

[0183] The transceiver 1320 may communicate bidirectionally via one or more antennas, wired or wireless links as described above. For example, the transceiver 1320 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 1320 may also include a modem to modulate packets and provide the modulated packets to an antenna for transmission, and demodulate packets received from an antenna.

[0184] In some cases, a wireless device may include a single antenna 1325. However, in some cases, a device may have more than one antenna 1325, which may be capable of sending or receiving multiple wireless transmissions simultaneously.

[0185] Memory 1330 may include RAM, ROM, or a combination thereof. Memory 1330 may store computer readable code 1335, which includes instructions that, when executed by a processor (e.g., processor 1340), cause the device to perform various functions described herein. In some cases, memory 1330 may contain, among other things, a BIOS that may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0186] Processor 1340 may include an intelligent hardware device (e.g., a general purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, processor 1340 may be configured to operate a memory array using a memory controller. In some cases, the memory controller may be integrated into processor 1340. Processor 1340 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1330) to cause device 1305 to perform various functions (e.g., functions or tasks that support coordinated sidelink resource allocation).

[0187] The inter-site communication manager 1345 may manage communications with other base stations 105 and may include a controller or scheduler for controlling communications with UE 115 in cooperation with other base stations 105. For example, the inter-site communication manager 1345 may coordinate scheduling of transmissions to UE 115 for various interference mitigation techniques such as beamforming or joint transmission. In some examples, the inter-site communication manager 1345 may provide an X2 interface within an LTE / LTE-A wireless communication network technology to provide communications between base stations 105.

[0188] The code 1335 may include instructions for implementing various aspects of the present disclosure, including instructions for supporting wireless communications. The code 1335 may be stored in a non-transitory computer-readable medium, such as a system memory or other type of memory. In some cases, the code 1335 may not be directly executable by the processor 1340, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0189] Fig.14 A flow chart illustrating a method 1400 for supporting coordinated sidelink resource allocation according to aspects of the present disclosure is shown. The operations of the method 1400 may be implemented by a UE 115 or a component thereof as described herein. For example, the operations of the method 1400 may be implemented by a UE 115 or a component thereof as described herein. Figures 6 to 9 In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described below.

[0190] At 1405, the UE may send a buffer status report for a first sidelink transmission to the device to the base station. The operations of 1405 may be performed according to the methods described herein. In some examples, aspects of the operations of 1405 may be as described with reference to Figures 6 to 9 The BSR sending component described here is executed.

[0191] At 1410, the UE may receive sidelink control information from the second UE, the sidelink control information scheduling the first UE for time resources for a second sidelink transmission from the second UE, the sidelink control information including an indication of a serving cell identifier of the second UE. The operations of 1410 may be performed according to the methods described herein. In some examples, aspects of the operations of 1410 may be performed as described with reference to Figures 6 to 9 Describes the SCI receiving component to perform.

[0192] Fig.15 A flow chart illustrating a method 1500 for supporting coordinated sidelink resource allocation according to aspects of the present disclosure is shown. The operations of the method 1500 may be implemented by a UE 115 or a component thereof as described herein. For example, the operations of the method 1500 may be implemented by a UE 115 or a component thereof as described with reference to FIG. Figures 6 to 9 In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described below.

[0193] At 1505, the UE may send a buffer status report for a first sidelink transmission to the device to the base station. The operations of 1505 may be performed according to the methods described herein. In some examples, aspects of the operations of 1505 may be performed as described with reference to Figures 6 to 9 The BSR sending component described here is executed.

[0194] At 1510, the UE may receive sidelink control information from the second UE, the sidelink control information scheduling the first UE for time resources for a second sidelink transmission from the second UE, the sidelink control information including an indication of a serving cell identifier of the second UE. The operations of 1510 may be performed according to the methods described herein. In some examples, aspects of the operations of 1510 may be performed as described with reference to Figures 6 to 9 Describes the SCI receiving component to perform.

[0195] At 1515, the UE may receive a grant from the base station to schedule a time resource for a first sidelink transmission, wherein both the first sidelink transmission and the second sidelink transmission are scheduled for a time resource corresponding to a half-duplex scheduling conflict for the first UE. The operations of 1515 may be performed according to the methods described herein. In some examples, aspects of the operations of 1515 may be performed as described with reference to Figures 6 to 9 The described sidelink allows the reconfiguration component to be executed.

[0196] At 1520, the UE may send a request to the base station to reconfigure a grant of a first sidelink transmission for the first UE based on the half-duplex scheduling conflict. The operations of 1520 may be performed according to the methods described herein. In some examples, aspects of the operations of 1520 may be as described with reference to Figures 6 to 9 The described sidelink allows the reconfiguration component to be executed.

[0197] At 1525, the UE may receive from the base station a grant to reconfigure the first UE for scheduling different time resources than the second sidelink transmission. The operations of 1525 may be performed according to the methods described herein. In some examples, aspects of the operations of 1525 may be performed as described with reference to Figures 6 to 9 The described sidelink allows the reconfiguration component to be executed.

[0198] Fig.16 A flow chart illustrating a method 1600 for supporting coordinated sidelink resource allocation according to aspects of the present disclosure is shown. The operations of the method 1600 may be implemented by a UE 115 or a component thereof as described herein. For example, the operations of the method 1600 may be implemented by a UE 115 or a component thereof as described herein. Figures 6 to 9In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described below.

[0199] At 1605, the UE may send a buffer status report for a first sidelink transmission to the device to the base station. The operations of 1605 may be performed according to the methods described herein. In some examples, aspects of the operations of 1605 may be as described with reference to Figures 6 to 9 The BSR sending component described here is executed.

[0200] At 1610, the UE may receive sidelink control information from the second UE, the sidelink control information scheduling the first UE for time resources for a second sidelink transmission from the second UE, the sidelink control information including an indication of a serving cell identifier of the second UE. The operations of 1610 may be performed according to the methods described herein. In some examples, aspects of the operations of 1610 may be performed as described with reference to Figures 6 to 9 Describes the SCI receiving component to perform.

[0201] At 1615, the UE may determine that the serving cell identifier for the second UE matches the serving cell identifier for the first UE. The operations of 1615 may be performed according to the methods described herein. In some examples, aspects of the operations of 1615 may be performed as described with reference to Figures 6 to 9 The destination identifier of the description indicates the component to execute.

[0202] At 1620, the UE may send an indicator of a destination identifier to the base station based on the serving cell identifier for the second UE matching the serving cell identifier for the first UE. The operations of 1620 may be performed according to the methods described herein. In some examples, aspects of the operations of 1620 may be as described with reference to Figures 6 to 9 The destination identifier of the description indicates the component to execute.

[0203] At 1625, the UE may receive a grant from the base station for the first sidelink transmission, the grant scheduling the first UE for a different time resource than the second sidelink transmission. The operations of 1625 may be performed according to the methods described herein. In some examples, aspects of the operations of 1625 may be performed as described with reference to Figures 6 to 9 The destination identifier of the description indicates the component to execute.

[0204] Fig.17A flow chart illustrating a method 1700 for supporting coordinated sidelink resource allocation according to aspects of the present disclosure is shown. The operations of the method 1700 may be implemented by a UE 115 or a component thereof as described herein. For example, the operations of the method 1700 may be implemented by a UE 115 or a component thereof as described with reference to FIG. Figures 6 to 9 In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described below.

[0205] At 1705, the UE may send a buffer status report for a sidelink transmission to the first UE to the base station. The operations of 1705 may be performed according to the methods described herein. In some examples, aspects of the operations of 1705 may be as described with reference to Figures 6 to 9 The BSR sending component described here is executed.

[0206] At 1710, the UE may receive a grant for sidelink transmission during the time resource from the base station based on sending the buffer status report. The operations of 1710 may be performed according to the methods described herein. In some examples, aspects of the operations of 1710 may be as described with reference to Figures 6 to 9 The described sidelink enables the receiving component to perform.

[0207] At 1715, the UE may send sidelink control information to the first UE, the sidelink control information including an indication of a sidelink transmission during the time resource and an indication of a serving cell identifier. The operations of 1715 may be performed according to the methods described herein. In some examples, aspects of the operations of 1715 may be performed as described with reference to Figures 6 to 9 Describes the SCI sending component to execute.

[0208] Fig.18 A flow chart illustrating a method 1800 for supporting coordinated sidelink resource allocation according to aspects of the present disclosure is shown. The operations of the method 1800 may be implemented by a base station 105 or components thereof as described herein. For example, the operations of the method 1800 may be implemented by a base station 105 or components thereof as described herein. Figures 10 to 13 In some examples, the base station may execute an instruction set to control the functional elements of the base station to perform the functions described below. Additionally or alternatively, the base station may use dedicated hardware to perform various aspects of the functions described below.

[0209] At 1805, the base station may receive a first buffer status report corresponding to a first sidelink transmission to the device from the first UE. The operations of 1805 may be performed according to the methods described herein. In some examples, aspects of the operations of 1805 may be performed as described with reference to Figures 10 to 13 The BSR receiving component described is performed.

[0210] At 1810, the base station may receive from the first UE an indicator of a half-duplex scheduling conflict for the first UE based on a first sidelink transmission from the first UE to the device and a second sidelink transmission from the second UE to the first UE. The operations of 1810 may be performed according to the methods described herein. In some examples, aspects of the operations of 1810 may be performed as described with reference to Figures 10 to 13 The described scheduling conflict instructs the receiving component to execute.

[0211] Fig.19 A flow chart illustrating a method 1900 for supporting coordinated sidelink resource allocation according to aspects of the present disclosure is shown. The operations of the method 1900 may be implemented by a base station 105 or components thereof as described herein. For example, the operations of the method 1900 may be implemented by a base station 105 or components thereof as described herein. Figures 10 to 13 In some examples, the base station may execute an instruction set to control the functional elements of the base station to perform the functions described below. Additionally or alternatively, the base station may use dedicated hardware to perform various aspects of the functions described below.

[0212] At 1905, the base station may receive a first buffer status report corresponding to a first sidelink transmission to the device from the first UE. The operations of 1905 may be performed according to the methods described herein. In some examples, aspects of the operations of 1905 may be performed as described with reference to Figures 10 to 13 The BSR receiving component described is performed.

[0213] At 1910, the base station may receive a second buffer status report from the second UE. The operations of 1910 may be performed according to the methods described herein. In some examples, aspects of the operations of 1910 may be performed as described with reference to Figures 10 to 13 The destination identifier of the description indicates the component to execute.

[0214] At 1915, the base station may send a second grant for a second sidelink transmission to the second UE based on receiving the second buffer status report. The operations of 1915 may be performed according to the methods described herein. In some examples, aspects of the operations of 1915 may be as described with reference to Figures 10 to 13 The destination identifier of the description indicates the component to execute.

[0215] At 1920, the base station may receive from the first UE an indicator of a half-duplex scheduling conflict for the first UE based on a first sidelink transmission from the first UE to the device and a second sidelink transmission from the second UE to the first UE. The operations of 1920 may be performed according to the methods described herein. In some examples, aspects of the operations of 1920 may be performed as described with reference to Figures 10 to 13 The described scheduling conflict instructs the receiving component to execute.

[0216] At 1925, the base station may receive an indicator of a destination identifier from the first UE based on the second UE and the first UE having matching serving cell identifiers. The operations of 1925 may be performed according to the methods described herein. In some examples, aspects of the operations of 1925 may be performed as described with reference to Figures 10 to 13 The destination identifier of the description indicates the component to execute.

[0217] At 1930, the base station may send a grant for a first sidelink transmission to the first UE based on an indicator of the destination identifier, the grant scheduling the first UE for a different time resource than the second sidelink transmission. The operations of 1930 may be performed according to the methods described herein. In some examples, aspects of the operations of 1930 may be performed as described with reference to Figures 10 to 13 The destination identifier of the description indicates the component to execute.

[0218] It should be noted that the methods described herein describe possible implementations, and that operations and steps may be rearranged or otherwise modified, and that other implementations are possible. Further, aspects from two or more of the methods may be combined.

[0219] Example 1 is a method for wireless communication at a first UE, comprising: sending a buffer status report for a first sidelink transmission to a device to a base station; and receiving sidelink control information from a second UE, the sidelink control information scheduling the first UE for time resources for a second sidelink transmission from the second UE, the sidelink control information including an indication of a serving cell identifier of the second UE.

[0220] In Example 2, the method of Example 1 also includes: receiving a grant from a base station to schedule time resources for a first sidelink transmission, wherein both the first sidelink transmission and the second sidelink transmission are scheduled for time resources corresponding to a half-duplex scheduling conflict for the first UE; sending a request to the base station for a grant to reconfigure the first sidelink transmission for the first UE based at least in part on the half-duplex scheduling conflict; and receiving a grant from the base station to reconfigure scheduling the first UE for a different time resource than the second sidelink transmission.

[0221] In Example 3, the method of any one of Examples 1-2 further includes determining that a serving cell identifier for the second UE does not match a serving cell identifier for the first UE, wherein the request for reconfiguration grant is sent based at least in part on the determination.

[0222] In Example 4, the request for a reconfiguration grant of any one of Examples 1-3 includes a bitmap of time slots corresponding to a half-duplex scheduling conflict set, the half-duplex scheduling conflict set including at least the half-duplex scheduling conflict.

[0223] In Example 5, the request for reconfiguration of the grant of any one of Examples 1-4 is sent with feedback of a grant for scheduling time resources for the first sidelink transmission.

[0224] In Example 6, the request for a reconfiguration grant of any of Examples 1-5 is sent based at least in part on receiving sidelink control information, receiving a grant to schedule a first sidelink transmission, or both.

[0225] In Example 7, the request for reconfiguration grant of any of Examples 1-6 is based at least in part on a priority of the first sidelink transmission, the second sidelink transmission, or both.

[0226] In Example 8, the method of any one of Examples 2-7 further includes determining that a serving cell identifier for the second UE matches a serving cell identifier for the first UE.

[0227] In Example 9, the method of Example 1 also includes: determining that a service cell identifier for a second UE matches a service cell identifier for a first UE; sending an indicator of a destination identifier to a base station based at least in part on the service cell identifier for the second UE matching the service cell identifier for the first UE; and receiving a grant for a first sidelink transmission from the base station, the grant scheduling the first UE for a different time resource than the second sidelink transmission.

[0228] In Example 10, the method of Example 9 further includes: receiving a second sidelink transmission from a second UE during a time resource; and sending the first sidelink transmission during a different time resource.

[0229] In Example 11, the method of any one of Examples 1-10 also includes: determining that the first sidelink transmission is scheduled for a time resource together with the second sidelink transmission; determining that the first sidelink transmission has a higher priority than the second sidelink transmission; discarding the second sidelink transmission based at least in part on the higher priority; and receiving the first sidelink transmission.

[0230] In Example 12, the method of any one of Examples 1-11 further includes: receiving a configuration for avoiding a half-duplex scheduling conflict, wherein the first sidelink transmission and the second sidelink transmission are scheduled for a half-duplex scheduling conflict.

[0231] In Example 13, the configuration for avoiding half-duplex scheduling conflicts of Example 12 is received via higher layer signaling, sidelink control information, downlink control information including a sidelink grant, or a combination thereof.

[0232] In Example 14, the configuration of Example 12 for avoiding half-duplex scheduling conflicts is based at least in part on the first priority of the first sidelink transmission, the second priority of the second sidelink transmission, or both.

[0233] In Example 15, the first sidelink transmission, the second sidelink transmission, or both of any one of Examples 1-14 are sent via the PC5 interface.

[0234] In Example 16, the indication of the serving cell identifier of any one of Examples 1-16 corresponds to one or more least significant bits of the serving cell identifier of the second UE.

[0235] Example 17 is a method for wireless communication at a second UE, comprising: sending a buffer status report for a sidelink transmission to a first UE to a base station; receiving a grant for the sidelink transmission during a time resource from the base station based at least in part on sending the buffer status report; and sending sidelink control information to the first UE, the sidelink control information comprising an indication of the sidelink transmission during the time resource and an indication of a serving cell identifier.

[0236] In Example 18, the method of Example 17 also includes: receiving a reconfiguration grant for the sidelink transmission from the base station, wherein the reconfiguration grant is based at least in part on sending sidelink control information including an indication of a serving cell identifier to schedule the sidelink transmission for different time resources.

[0237] In Example 19, the method of any one of Examples 17-18 further includes: sending a sidelink transmission to the first UE during the time resource.

[0238] In Example 20, the method of any one of Examples 17-19 further includes: sending a configuration for avoiding half-duplex scheduling conflicts to the first UE via sidelink control information.

[0239] In Example 21, the sidelink transmission of any of Examples 17-20 is sent via the PC5 interface.

[0240] In Example 22, the indication of the serving cell identifier of any one of Examples 17-21 corresponds to one or more least significant bits of the serving cell identifier.

[0241] Example 23 is a method for wireless communication at a base station, comprising: receiving a first buffer status report corresponding to a first sidelink transmission to a device from a first UE; and receiving an indicator of a half-duplex scheduling conflict for the first UE from the first UE based at least in part on the first sidelink transmission from the first UE to the device and the second sidelink transmission from the second UE to the first UE.

[0242] In Example 24, the method of Example 23 also includes: sending a grant to schedule time resources for a first sidelink transmission to the first UE; receiving a request from the first UE to reconfigure the grant for the first sidelink transmission based at least in part on a half-duplex scheduling conflict; and sending a grant for reconfiguration of the first sidelink transmission to the first UE based at least in part on the request and the half-duplex scheduling conflict.

[0243] In Example 25, the indicator of Examples 24-15 comprises a bitmap of time slots corresponding to a half-duplex scheduling conflict set for the first UE, the half-duplex scheduling conflict set including at least the half-duplex scheduling conflict.

[0244] In Example 26, the request for reconfiguration of any one of Examples 24-25 is received with feedback for the grant for the first sidelink transmission.

[0245] In Example 27, the method of any one of Examples 23-26 also includes: receiving a second buffer status report from a second UE; sending a second grant for a second sidelink transmission to the second UE based at least in part on receiving the second buffer status report; receiving an indicator of a destination identifier from the first UE based at least in part on the second UE and the first UE having matching serving cell identifiers; and sending a grant for the first sidelink transmission to the first UE based at least in part on the indicator of the destination identifier, wherein the grant schedules the first UE for a different time resource than the second sidelink transmission.

[0246] In Example 28, the method of any one of Examples 23-27 further includes sending a configuration for avoiding half-duplex scheduling conflicts via higher layer signaling, downlink control information including a sidelink grant, or both.

[0247] In Example 29, the configuration of Example 28 for avoiding half-duplex scheduling conflicts is based at least in part on the first priority of the first sidelink transmission, the second priority of the second sidelink transmission, or both.

[0248] In Example 30, the first sidelink transmission, the second sidelink transmission, or both of any of Examples 23-29 are sent via the PC5 interface.

[0249] Example 31 is a system or device, which includes a unit for performing a method as in any of Examples 1-16 or implementing a device as in any of Examples 1-16.

[0250] Example 32 is a non-transitory computer-readable medium storing instructions, which can be executed by one or more processors to cause the one or more processors to implement the method as in any of Examples 1-16.

[0251] Example 33 is a system comprising one or more processors and a memory storing instructions in electronic communication with the one or more processors, the instructions executable by the one or more processors to cause the system or device to implement a method as in any of Examples 1-16.

[0252] Example 34 is a system or apparatus comprising a unit for executing a method as in any one of Examples 17-22 or implementing an apparatus as in any one of Examples 17-22.

[0253] Example 35 is a non-transitory computer-readable medium storing instructions, which can be executed by one or more processors to cause the one or more processors to implement the method as in any of Examples 17-22.

[0254] Example 36 is a system comprising one or more processors and a memory storing instructions in electronic communication with the one or more processors, the instructions executable by the one or more processors to cause the system or device to implement a method as in any of Examples 17-22.

[0255] Example 37 is a system or apparatus comprising a unit for executing a method as in any one of Examples 23-20 or implementing an apparatus as in any one of Examples 23-30.

[0256] Example 38 is a non-transitory computer-readable medium storing instructions, which can be executed by one or more processors to cause the one or more processors to implement the method as in any of Examples 23-30.

[0257] Example 39 is a system comprising one or more processors and a memory storing instructions in electronic communication with the one or more processors, the instructions executable by the one or more processors to cause the system or device to implement a method as in any of Examples 23-30.

[0258] Although aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for purposes of example, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein may be applicable beyond LTE, LTE-A, LTE-A Pro, or NR networks. For example, the techniques described may be applicable to various other wireless communication systems, such as Ultra Mobile Broadband (UMB), Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, and other systems and radio technologies not explicitly mentioned herein.

[0259] The information and signals described herein may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips mentioned throughout the description may be represented by voltage, current, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0260] The various illustrative blocks and components described in conjunction with the disclosure herein may be implemented or executed using a general purpose processor, DSP, ASIC, CPU, FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in an alternative, the processor may be any processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, a combination of one or more microprocessors and a DSP core, or any other such configuration).

[0261] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or sent through a computer-readable medium as one or more instructions or codes. Other examples and implementations are within the scope of the present disclosure and the appended claims. For example, due to the nature of software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hard wiring, or a combination of any of these items. Features that implement the functions may also be physically located at various locations, including being distributed so that portions of the functions are implemented at different physical locations.

[0262] Computer-readable medium includes both non-transitory computer storage medium and communication medium, and communication medium includes any medium that promotes the transmission of computer program from one place to another place.Non-transitory storage medium can be any available medium that can be accessed by general-purpose computer or special-purpose computer.By way of example and not limitation, non-transitory computer-readable medium can include random access memory (RAM), read-only memory (ROM), electrically erasable programmable ROM (EEPROM), flash memory, compact disc (CD) ROM or other optical disc storage, disk storage or other magnetic storage device, or can be used for carrying or storing desired program code unit and can be accessed by general-purpose or special-purpose computer or general-purpose or special-purpose processor in the form of instruction or data structure Any other non-transitory medium.In addition, any connection is appropriately called computer-readable medium.For example, if software is to use coaxial cable, optical fiber cable, twisted pair, digital subscriber line (DSL) or wireless technology such as infrared, radio and microwave to send from website, server or other remote source, then coaxial cable, optical fiber cable, twisted pair, DSL or wireless technology such as infrared, radio and microwave are included in the definition of computer-readable medium. As used herein, disk and disc include CD, laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc, where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

[0263] As used herein (including in the claims), "or" as used in a list of items (e.g., a list of items ending with a phrase such as "at least one of" or "one or more of") indicates an inclusive list, so that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). In addition, as used herein, the phrase "based on" should not be interpreted as a reference to a closed set of conditions. For example, an example step described as "based on condition A" can be based on both condition A and condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "based at least in part on."

[0264] In the drawings, similar components or features may have the same reference label. Further, various components of the same type may be distinguished by following the reference label with a dash and a second label, the second label being used to distinguish among similar components. If only the first reference label is used in the specification, the description applies to any of the similar components having the same first reference label, without regard to the second reference label or other subsequent reference labels.

[0265] The descriptions set forth herein in conjunction with the accompanying drawings describe example configurations, and do not represent all examples that may be implemented or within the scope of the claims. The term "example" as used herein means "used as an example, instance, or illustration," and is not "preferred" or "advantageous over other examples." For the purpose of providing an understanding of the described techniques, the detailed description includes specific details. However, these techniques may be practiced without these specific details. In some cases, known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described examples.

[0266] The description herein is provided to enable one of ordinary skill in the art to implement or use the present disclosure. Various modifications to the present disclosure will be apparent to one of ordinary skill in the art, and the general principles defined herein may be applied to other variations without departing from the scope of the present disclosure. Therefore, the present disclosure is not limited to the examples and designs described herein, but is given the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication at a first user equipment (UE), comprising: sending a buffer status report for a first sidelink transmission to the device to a network entity; receiving, based on sending the buffer status report, from the network entity a grant to schedule first time resources for the first sidelink transmission; receiving sidelink control information from a second UE, the sidelink control information scheduling the first UE for the first time resource for a second sidelink transmission from the second UE, the sidelink control information including an indication of a serving cell identifier of the second UE, wherein both the first sidelink transmission and the second sidelink transmission being scheduled for the first time resource corresponds to a half-duplex scheduling conflict at the first UE; sending, to the network entity, a request to reconfigure the grant for the first sidelink transmission based at least in part on the half-duplex scheduling conflict at the first UE; and Based on the sent request, a reconfiguration grant is received from the network entity for scheduling a second time resource for the first sidelink transmission that is different from the first time resource for the second sidelink transmission, wherein the reconfiguration grant is configured to resolve the half-duplex scheduling conflict.

2. An apparatus for wireless communication at a first user equipment (UE), comprising: processor, a memory coupled to the processor; as well as Instructions, which are stored in the memory and can be executed by the processor to cause the device to perform the following operations: sending a buffer status report for a first sidelink transmission to the device to a network entity; receiving, based on sending the buffer status report, from the network entity a grant to schedule first time resources for the first sidelink transmission; receiving sidelink control information from a second UE, the sidelink control information scheduling the first UE for the first time resource for a second sidelink transmission from the second UE, the sidelink control information including an indication of a serving cell identifier of the second UE, wherein both the first sidelink transmission and the second sidelink transmission being scheduled for the first time resource corresponds to a half-duplex scheduling conflict at the first UE; sending, to the network entity, a request to reconfigure the grant for the first sidelink transmission based at least in part on the half-duplex scheduling conflict at the first UE; and Based on the sent request, a reconfiguration grant is received from the network entity for scheduling a second time resource for the first sidelink transmission that is different from the first time resource for the second sidelink transmission, wherein the reconfiguration grant is configured to resolve the half-duplex scheduling conflict.

3. The device according to claim 2, wherein: The instructions may also be executed by the processor to cause the device to perform the following operations: A determination is made that a serving cell identifier for the second UE does not match a serving cell identifier for the first UE, wherein the request to reconfigure the grant is sent based at least in part on the determination.

4. The device according to claim 2, wherein: The request to reconfigure the grant includes a bitmap of time slots corresponding to a set of half-duplex scheduling conflicts, the set of half-duplex scheduling conflicts including at least the half-duplex scheduling conflict.

5. The device according to claim 2, wherein: The request to reconfigure the grant is sent with feedback for the grant scheduling the first time resource for the first sidelink transmission.

6. The device according to claim 2, wherein: The request to reconfigure the grant is sent based at least in part on receiving the sidelink control information, receiving the grant scheduling the first sidelink transmission, or both.

7. The device according to claim 2, wherein: The request to reconfigure the grant is based at least in part on a priority of the first sidelink transmission, the second sidelink transmission, or both.

8. The device according to claim 2, wherein: The instructions may also be executed by the processor to cause the device to perform the following operations: It is determined that a serving cell identifier for the second UE matches a serving cell identifier for the first UE.

9. The device according to claim 2, wherein: The instructions may also be executed by the processor to cause the device to perform the following operations: determining that a serving cell identifier for the second UE matches a serving cell identifier for the first UE; sending an indicator of a destination identifier to the network entity based at least in part on a serving cell identifier for the second UE matching a serving cell identifier for the first UE; as well as A grant is received from the network entity for the first sidelink transmission, the grant scheduling the first UE for a different time resource than the time resource scheduled for the second sidelink transmission.

10. The device according to claim 9, wherein: The instructions may also be executed by the processor to cause the device to perform the following operations: receiving the second sidelink transmission from the second UE during the first time resource; and The first sidelink transmission is sent during the different time resource.

11. The device according to claim 2, wherein: The instructions may also be executed by the processor to cause the device to perform the following operations: determining that the first sidelink transmission has a higher priority than the second sidelink transmission; discarding the second sidelink transmission based at least in part on the higher priority; and Sending the first sidelink transmission.

12. The device according to claim 2, wherein: The configuration for avoiding half-duplex scheduling conflicts is received via higher layer signaling, the sidelink control information, downlink control information including a sidelink grant, or a combination thereof.

13. The device according to claim 2, wherein: The configuration for avoiding half-duplex scheduling conflicts is based at least in part on a first priority of the first sidelink transmission, a second priority of the second sidelink transmission, or both.

14. The device according to claim 2, wherein: The first sidelink transmission, the second sidelink transmission, or both are sent via the PC5 interface.

15. The device according to claim 2, wherein: The indication of the serving cell identifier corresponds to one or more least significant bits of the serving cell identifier of the second UE.

16. An apparatus for wireless communication at a second user equipment (UE), comprising: processor, a memory coupled to the processor; as well as Instructions, which are stored in the memory and can be executed by the processor to cause the device to perform the following operations: sending a buffer status report for a sidelink transmission to the first UE to a network entity; receiving, from the network entity, a grant for the sidelink transmission during a time resource based at least in part on sending the buffer status report; as well as Sidelink control information is sent to the first UE, the sidelink control information comprising an indication of the sidelink transmission during the time resource and an indication of a serving cell identifier.

17. The device according to claim 16, wherein: The instructions may also be executed by the processor to cause the device to perform the following operations: The sidelink transmission is sent to the first UE during the time resource.

18. The device according to claim 16, wherein: The instructions may also be executed by the processor to cause the device to perform the following operations: A configuration for avoiding half-duplex scheduling conflicts is sent to the first UE via the sidelink control information.

19. The device according to claim 16, wherein: The sidelink transmission is sent via the PC5 interface.

20. The device according to claim 16, wherein: The indication of the serving cell identifier corresponds to one or more least significant bits of the serving cell identifier.

21. An apparatus for wireless communication at a network entity, comprising: processor, a memory coupled to the processor; as well as Instructions, which are stored in the memory and can be executed by the processor to cause the device to perform the following operations: receiving, from a first user equipment (UE), a first buffer status report corresponding to a first sidelink transmission to the device; Based on the received first buffer status report, sending a grant to the first UE to schedule first time resources for the first sidelink transmission; receiving, from the first UE, a request to reconfigure the grant for the first sidelink transmission based on a half-duplex scheduling conflict at the first UE, wherein the half-duplex scheduling conflict is based at least in part on the first sidelink transmission from the first UE to the device and a second sidelink transmission from a second UE to the first UE being scheduled for the first time resource; and Based on the received request, a reconfiguration grant is sent to the first UE for scheduling a second time resource for the first sidelink transmission that is different from the first time resource for the second sidelink transmission, wherein the reconfiguration grant is configured to resolve the half-duplex scheduling conflict.

22. The device according to claim 21, wherein The request to reconfigure the grant includes a bitmap of time slots corresponding to a set of half-duplex scheduling conflicts for the first UE, the set of half-duplex scheduling conflicts including at least the half-duplex scheduling conflict.

23. The device according to claim 21, wherein The request to reconfigure the grant is received with feedback for the grant for the first sidelink transmission.

24. The device according to claim 21, wherein The instructions may also be executed by the processor to cause the device to perform the following operations: Configuration for avoiding half-duplex scheduling conflicts is sent via higher layer signaling, downlink control information including sidelink grants, or both.

25. The device according to claim 24, wherein: The configuration for avoiding half-duplex scheduling conflicts is based at least in part on a first priority of the first sidelink transmission, a second priority of the second sidelink transmission, or both.

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