Control signaling techniques for sidelink communications

Abstract

Methods, systems, and apparatus for wireless communications are described. In summary, the described techniques provide for determining shared resources associated with one or more user equipments (UEs) for sidelink communications, including control resources and data resources. A first UE may determine a first set of control resources in a first frequency band corresponding to a first UE group that includes the first UE. The first UE may send a sidelink request to a second UE in the first UE group for reserving a subset of data resources. The first UE may monitor one or more sidelink responses indicating a positive sidelink response to the sidelink request, a negative sidelink response to the sidelink request, or both. The first UE may determine whether to send a sidelink acknowledgment indicating a reservation of data resources to the second UE based on monitoring the one or more sidelink responses.

Description

[0001] Cross-references

[0002] This patent application claims the benefits of the following applications: U.S. Provisional Patent Application No. 62 / 957,466, entitled “CONTROL SIGNALING TECHNIQUES FOR SIDELINK COMMUNICATIONS,” filed by RYU et al. on January 6, 2020; and U.S. Patent Application No. 17 / 120,560, entitled “CONTROL SIGNALING TECHNIQUES FOR SIDELINK COMMUNICATIONS,” filed by RYU et al. on December 14, 2020, each of which is assigned to the assignee of this application, and each of which is incorporated herein by reference. Technical Field

[0003]

[0014] The following relates generally to wireless communications and, more particularly, to control signaling techniques for sidelink communications. Background Art

[0004] Wireless communication systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, etc. These systems may be able to support communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multiple access systems include fourth generation (4G) systems (such as long term evolution (LTE) systems, advanced LTE (LTE-A) systems, or LTE-A Pro systems) and fifth generation (5G) systems (which may be referred to as new radio (NR) systems). These systems may employ technologies 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).

[0005] A wireless multiple-access communication system may include one or more base stations or one or more network access nodes, each of which simultaneously supports communication for multiple communication devices (which may also be referred to as user equipment (UE)). Some UEs may communicate with each other, for example, via one or more sidelink channels, and may utilize shared resources, such as time resources, frequency resources, or space resources. Summary of the Invention

[0006] The described technology relates to improved methods, systems, devices and apparatus for supporting control signaling techniques for sidelink communications. In summary, the described technology provides increased system efficiency by implementing multiplexing (such as frequency division multiplexing (FDM)) of control signaling for communications on one or more sidelinks. Various user equipments (UEs) can communicate with each other on sidelink control resources to claim shared data resources for sidelink data transmission. UEs can be configured into one or more groups based on one or more resource allocation schemes. For example, a UE group can correspond to a frequency band of a sidelink control resource. Different UE groups can send or receive communications on the corresponding frequency band of the control resource, which can increase efficiency and resource utilization in the system. In some examples, a base station can determine a set of UEs to be included in the group (e.g., based on the priority of communications from each UE or the proximity of the UE sets to each other, as well as other examples), and can indicate the group to one or more UEs. Additionally or alternatively, a UE that can act as a group leader can determine a set of UEs to be included in the group and can indicate the group to the UEs.

[0007] In some examples, one or more corresponding control blocks in a frequency band may be allocated to at least some of the UEs included in the UE group (if not every UE). For example, a first UE may use the control block allocated to the first UE to claim a portion of available data resources. The first UE may send a sidelink request to a second UE (e.g., a target UE in the UE group). The sidelink request may indicate a set of data resources for reservation or a defined segment of data resources. The first UE may monitor sidelink responses from one or more UEs. For example, the second UE or another UE (e.g., a non-target UE, a UE in another UE group, or both) may send a positive sidelink response, avoid sending a positive sidelink response, send a negative sidelink response, or avoid sending a negative sidelink response. In some examples, the first UE may send a sidelink confirmation indicating that the first UE will send the reserved data resources on which one or more data transmissions are sent based on one or more sidelink responses indicating that the data resources are available or unavailable.

[0008] One innovative aspect of the subject matter described in this disclosure can be implemented in a method for wireless communication. The method may include: determining shared resources for communicating on one or more sidelink communication links, the shared resources comprising control resources and data resources; determining a first set of control resources in a first frequency band corresponding to a first UE group, the first UE group comprising a first UE; transmitting a sidelink request to reserve the set of data resources on a transmit beam on a first control block of the first set of control resources to a second UE in the first UE group, wherein the first control block is allocated to the first UE; and monitoring, by the first UE on a receive beam on the first set of control resources, one or more sidelink responses.

[0009] Another innovative aspect of the subject matter described in the present disclosure can be implemented in an apparatus for wireless communication. 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 perform the following operations: determine shared resources for communicating on one or more sidelink communication links, the shared resources including control resources and data resources; determine a first set of control resources in a first frequency band corresponding to a first UE group, the first UE group including a first UE; send a sidelink request for reserving the set of data resources on a transmit beam on a first control block of the first set of control resources to a second UE in the first UE group, wherein the first control block is assigned to the first UE; and monitor, by the first UE, on a receive beam on the first set of control resources for one or more sidelink responses.

[0010] Another innovative aspect of the subject matter described in this disclosure can be implemented in an apparatus for wireless communication. The apparatus may include means for determining shared resources for communicating on one or more sidelink communication links, the shared resources comprising control resources and data resources; determining a first set of control resources in a first frequency band corresponding to a first UE group, the first UE group comprising a first UE; transmitting a sidelink request to reserve the set of data resources on a transmit beam on a first control block of the first set of control resources to a second UE in the first UE group, wherein the first control block is allocated to the first UE; and monitoring, by the first UE on a receive beam on the first set of control resources, one or more sidelink responses.

[0011] Another innovative aspect of the subject matter described in the present disclosure can be implemented in a non-transitory computer-readable medium storing code for wireless communication. The code may include instructions executable by a processor to: determine shared resources for communicating on one or more sidelink communication links, the shared resources including control resources and data resources; determine a first set of control resources in a first frequency band corresponding to a first UE group, the first UE group including a first UE; send a sidelink request to reserve the set of data resources on a transmit beam on a first control block of the first set of control resources to a second UE in the first UE group, wherein the first control block is assigned to the first UE; and monitor, by the first UE, on a receive beam on the first set of control resources for one or more sidelink responses.

[0012] Another innovative aspect of the subject matter described in the present disclosure can be implemented in a method for wireless communication. The method may include: determining shared resources for communicating on one or more sidelink communication links, the shared resources comprising control resources and data resources; determining a first set of control resources in a first frequency band corresponding to a first UE group, the first UE group comprising a first UE and a second UE; monitoring, on a first control block of the first set of control resources, on a receive beam, for a sidelink request from a second UE to reserve the set of data resources, the first control block being allocated to the second UE and the sidelink request indicating that the first UE is a target UE of the sidelink request; and determining, based on the monitoring, whether to transmit a sidelink response to the second UE on a transmit beam on the first set of control resources, the sidelink response comprising a positive sidelink response to the sidelink request or a negative sidelink response to the sidelink request, the positive sidelink response indicating that the set of data resources is available, and the negative sidelink response indicating that the set of data resources is unavailable.

[0013] Another innovative aspect of the subject matter described in this disclosure can be implemented in an apparatus for wireless communication. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions can be executable by the processor to cause the device to perform the following operations: determine shared resources for communicating on one or more sidelink communication links, the shared resources including control resources and data resources; determine the first control resource set in a first frequency band corresponding to a first UE group, the first UE group including a first UE and a second UE; monitor on a first control block of the first control resource set on a receive beam for a sidelink request from the second UE for reserving the set of data resources, the first control block being allocated to the second UE, and the sidelink request indicating that the first UE is a target UE of the sidelink request; and determine based on the monitoring whether to send a sidelink response to the second UE on a transmit beam on the first control resource set, the sidelink response including a positive sidelink response to the sidelink request or a negative sidelink response to the sidelink request, the positive sidelink response indicating that the set of data resources is available, and the negative sidelink response indicating that the set of data resources is unavailable.

[0014] Another innovative aspect of the subject matter described in the present disclosure can be implemented in an apparatus for wireless communication. The apparatus may include means for determining shared resources for communicating on one or more sidelink communication links, the shared resources comprising control resources and data resources; determining a first set of control resources in a first frequency band corresponding to a first UE group, the first UE group comprising a first UE and a second UE; monitoring, on a receive beam on a first control block of the first set of control resources, for a sidelink request from a second UE to reserve the set of data resources, the first control block being allocated to the second UE and the sidelink request indicating that the first UE is a target UE of the sidelink request; and determining, based on the monitoring, whether to transmit a sidelink response to the second UE on a transmit beam on the first set of control resources, the sidelink response comprising a positive sidelink response to the sidelink request or a negative sidelink response to the sidelink request, the positive sidelink response indicating that the set of data resources is available and the negative sidelink response indicating that the set of data resources is not available.

[0015] Another innovative aspect of the subject matter described in the present disclosure can be implemented in a non-transitory computer-readable medium storing code for wireless communication. The code may include instructions executable by a processor to: determine shared resources for communicating on one or more sidelink communication links, the shared resources comprising control resources and data resources; determine a first set of control resources in a first frequency band corresponding to a first UE group, the first UE group comprising a first UE and a second UE; monitor, on a first control block of the first set of control resources, on a receive beam, for a sidelink request from a second UE to reserve the set of data resources, the first control block being assigned to the second UE and the sidelink request indicating that the first UE is a target UE of the sidelink request; and determine, based on the monitoring, whether to transmit a sidelink response to the second UE on a transmit beam on the first set of control resources, the sidelink response comprising a positive sidelink response to the sidelink request or a negative sidelink response to the sidelink request, the positive sidelink response indicating that the set of data resources is available, and the negative sidelink response indicating that the set of data resources is unavailable.

[0016] Another innovative aspect of the subject matter described in the present disclosure can be implemented in a method for wireless communication. The method may include: determining shared resources for communicating on one or more sidelink communication links, the shared resources comprising control resources and data resources; determining a first set of control resources in a first frequency band corresponding to a first UE group, the first UE group comprising a first UE and a second UE; monitoring a first sidelink request from a second UE on a receive beam on the first set of control resources in the first frequency band; receiving a second sidelink request from a third UE to reserve the set of data resources based on the monitoring, the second sidelink request indicating that a fourth UE is a target UE for the second sidelink request, the second UE group comprising the third UE and the fourth UE; and determining whether to send a sidelink response to the third UE based on receiving the second sidelink request, the sidelink response indicating a positive response to the second sidelink request to reserve the set of data resources or a negative response to the second sidelink request to reserve the set of data resources.

[0017] Another innovative aspect of the subject matter described in this disclosure can be implemented in an apparatus for wireless communication. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions can be executable by the processor to cause the device to perform the following operations: determine shared resources for communicating on one or more sidelink communication links, the shared resources including control resources and data resources; determine a first set of control resources in a first frequency band corresponding to a first UE group, the first UE group including a first UE and a second UE; monitor a first sidelink request from the second UE on a receive beam on the first set of control resources in the first frequency band; receive a second sidelink request for reserving the set of data resources from a third UE based on the monitoring, the second sidelink request indicating that a fourth UE is a target UE of the second sidelink request, the second UE group including the third UE and the fourth UE; and determine whether to send a sidelink response to the third UE based on receiving the second sidelink request, the sidelink response indicating a positive response to the second sidelink request for reserving the set of data resources or a negative response to the second sidelink request for reserving the set of data resources.

[0018] Another innovative aspect of the subject matter described in the present disclosure can be implemented in an apparatus for wireless communication. The apparatus may include means for determining shared resources for communicating on one or more sidelink communication links, the shared resources comprising control resources and data resources; determining a first set of control resources in a first frequency band corresponding to a first UE group, the first UE group comprising a first UE and a second UE; monitoring a first sidelink request from a second UE on a receive beam on the first set of control resources in the first frequency band; receiving a second sidelink request from a third UE to reserve the set of data resources based on the monitoring, the second sidelink request indicating that a fourth UE is a target UE for the second sidelink request, the second UE group comprising the third UE and the fourth UE; and determining whether to send a sidelink response to the third UE based on receiving the second sidelink request, the sidelink response indicating a positive response to the second sidelink request to reserve the set of data resources or a negative response to the second sidelink request to reserve the set of data resources.

[0019] Another innovative aspect of the subject matter described in the present disclosure can be implemented in a non-transitory computer-readable medium storing code for wireless communication. The code may include instructions executable by a processor to: determine shared resources for communicating on one or more sidelink communication links, the shared resources comprising control resources and data resources; determine a first set of control resources in a first frequency band corresponding to a first UE group, the first UE group comprising a first UE and a second UE; monitor a first sidelink request from a second UE on a receive beam on the first set of control resources in the first frequency band; receive a second sidelink request from a third UE to reserve the set of data resources based on the monitoring, the second sidelink request indicating that a fourth UE is a target UE for the second sidelink request, the second UE group comprising the third UE and the fourth UE; and determine whether to send a sidelink response to the third UE based on receiving the second sidelink request, the sidelink response indicating a positive response to the second sidelink request to reserve the set of data resources or a negative response to the second sidelink request to reserve the set of data resources.

[0020] Another innovative aspect of the subject matter described in this disclosure can be implemented in a method for wireless communication. The method may include: determining shared resources for sidelink communication between at least a first UE and a second UE, the shared resources comprising control resources and data resources; assigning the first UE to a first UE group and assigning the second UE to a second UE group, wherein the first UE group is associated with a first set of control resources in a first frequency band and the second UE group is associated with a second set of control resources in a second frequency band; and sending an indication to at least one of the first UE or the second UE that the first UE is assigned to the first UE group, the second UE is assigned to the second UE group, or both.

[0021] Another innovative aspect of the subject matter described in the present disclosure can be implemented in an apparatus for wireless communication. 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 perform the following operations: determine shared resources for sidelink communication between at least a first UE and a second UE, the shared resources including control resources and data resources; assign the first UE to a first UE group and the second UE to a second UE group, wherein the first UE group is associated with a first set of control resources in a first frequency band and the second UE group is associated with a second set of control resources in a second frequency band; and send an indication to at least one of the first UE or the second UE that the first UE is assigned to the first UE group, the second UE is assigned to the second UE group, or both.

[0022] Another innovative aspect of the subject matter described in this disclosure can be implemented in an apparatus for wireless communication. The apparatus may include means for determining shared resources for sidelink communication between at least a first UE and a second UE, the shared resources comprising control resources and data resources; assigning the first UE to a first UE group and the second UE to a second UE group, wherein the first UE group is associated with a first set of control resources in a first frequency band and the second UE group is associated with a second set of control resources in a second frequency band; and sending an indication to at least one of the first UE or the second UE that the first UE is assigned to the first UE group, the second UE is assigned to the second UE group, or both.

[0023] Another innovative aspect of the subject matter described in the present disclosure can be implemented in a non-transitory computer-readable medium storing code for wireless communication. The code may include instructions executable by a processor to: determine shared resources for sidelink communication between at least a first UE and a second UE, the shared resources including control resources and data resources; assign the first UE to a first UE group and the second UE to a second UE group, wherein the first UE group is associated with a first set of control resources in a first frequency band and the second UE group is associated with a second set of control resources in a second frequency band; and send an indication to at least one of the first UE or the second UE that the first UE is assigned to the first UE group, the second UE is assigned to the second UE group, or both. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1

[0014] An example of a system for wireless communications that supports control signaling techniques for sidelink communications in accordance with aspects of the present disclosure is shown.

[0025] Figure 2 An example of a wireless communication system supporting control signaling techniques for sidelink communications in accordance with aspects of the present disclosure is shown.

[0026] Figure 3 An example of a resource allocation scheme supporting control signaling techniques for sidelink communications in accordance with aspects of the present disclosure is shown.

[0027] Figure 4 An example of a resource allocation scheme supporting control signaling techniques for sidelink communications in accordance with aspects of the present disclosure is shown.

[0028] Figure 5 An example of a resource allocation scheme supporting control signaling techniques for sidelink communications in accordance with aspects of the present disclosure is shown.

[0029] Figure 6 An example of a wireless communication system supporting control signaling techniques for sidelink communications in accordance with aspects of the present disclosure is shown.

[0030] Figure 7 An example of a wireless communication system supporting control signaling techniques for sidelink communications in accordance with aspects of the present disclosure is shown.

[0031] Figure 8 and 9 A block diagram of a device supporting control signaling techniques for sidelink communications in accordance with aspects of the present disclosure is shown.

[0032] Figure 10 A block diagram of a communications manager supporting control signaling techniques for sidelink communications is shown in accordance with aspects of the present disclosure.

[0033] Figure 11 A schematic diagram of a system including devices supporting control signaling techniques for sidelink communications is shown in accordance with aspects of the present disclosure.

[0034] Figure 12 and 13 A block diagram of a device supporting control signaling techniques for sidelink communications in accordance with aspects of the present disclosure is shown.

[0035] Figure 14 A block diagram of a communications manager supporting control signaling techniques for sidelink communications is shown in accordance with aspects of the present disclosure.

[0036] Figure 15 A schematic diagram of a system including devices supporting control signaling techniques for sidelink communications is shown in accordance with aspects of the present disclosure.

[0037] Figures 16 to 19 A flow chart illustrating a method of supporting control signaling techniques for sidelink communications in accordance with aspects of the present disclosure is shown. DETAILED DESCRIPTION

[0038] In some examples of wireless communication systems, a base station may communicate with one or more user equipments (UEs) via downlink signals and uplink signals. The UEs may also communicate with each other via one or more sidelink signals. In some examples, the base station may allocate shared resources for sidelink communications (such as communications between UEs). The UEs may perform a beam training process to identify one or more characteristics or parameters (such as directional beams) on which to communicate with each other, and the UEs may use shared resources (e.g., resources from a shared resource pool allocated by the base station) to communicate with each other on a sidelink communication link.

[0039] In some examples, the shared resource pool for sidelink communication may include control resources and data resources. The UE may send or receive control signals on the control resources to reserve data resources for sidelink communication. The UE may be allocated a portion of the control resources for such control signaling (e.g., one time slot of the control resources). However, in some examples, the UE may not utilize all of the portion of the UE's allocated control resources. In such an example, the remaining control resources of the allocated portion may remain unused (e.g., there may be an over-allocation of resources for the UE), which may lead to system inefficiency, increased latency, and a reduced user experience, among other issues.

[0040] In summary, various aspects relate to sidelink communications, and more specifically, to multiplexing of control signaling on control resources, such as frequency division multiplexing (FDM). UEs in a wireless communication system can be configured in one or more groups according to a resource allocation scheme. For example, a UE group can be configured to communicate via sidelink control resources in a corresponding frequency band. Different UE groups can send or receive communications via control resources allocated in different respective frequency bands. For example, a first UE group can be allocated a control block in a first frequency band, and a second UE group can be allocated a control block in a second frequency band. A control block can have a duration of one or more transmission time intervals (e.g., 1 time slot). The UEs in the first group can communicate with each other using the control resources on the first frequency band to determine which UEs can request and use data resources from a shared resource pool.

[0041] In some examples, one or more corresponding control blocks in a frequency band may be allocated to at least some of the UEs included in the UE group (if not every UE). For example, a first UE may use the control block allocated to the first UE to claim a portion of available data resources. The first UE may send a sidelink request to a second UE (e.g., a target UE in the UE group). The sidelink request may indicate a set of data resources or a defined segment of data resources for reservation. The first UE may monitor sidelink responses from one or more UEs. For example, the second UE or another UE (e.g., a non-target UE, a UE in another UE group, or both) may send a positive sidelink response, avoid sending a positive sidelink response, send a negative sidelink response, or avoid sending a negative sidelink response. In some examples, the first UE may send a sidelink confirmation indicating that the first UE will send one or more reserved data resources on which data transmissions are to be transmitted based on one or more sidelink responses indicating that data resources are available or unavailable. In some examples, the individual UE groups may have different sizes, the UE may belong to one or more groups, or any combination thereof, as described herein.

[0042] Certain aspects of the subject matter described herein can be implemented to achieve one or more advantages. By multiplexing control signaling on control resources, the described techniques can support increased system efficiency (e.g., relatively efficient resource utilization). Additionally or alternatively, the described techniques can support relatively high communication reliability.

[0043] Aspects of the present disclosure are first described in the context of a wireless communication system. Aspects of the present disclosure are further illustrated and described with reference to a resource allocation scheme. Aspects of the present disclosure are further illustrated and described with reference to apparatus diagrams, system diagrams, and flow diagrams relating to control signaling techniques for sidelink communications.

[0044] Figure 1 An example of a wireless communication system 100 supporting control signaling techniques for sidelink communications 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 Advanced 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, or communications with low-cost and low-complexity devices, or any combination thereof.

[0045] Base stations 105 may be dispersed throughout a geographic area to form wireless communication system 100 and may be devices of different forms or 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 areas 110 may be examples of geographic areas over which base stations 105 and UEs 115 may support transmission of signals according to one or more radio access technologies.

[0046] The 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. The UEs 115 may be devices of different forms or with different capabilities. Figure 1 Some example UEs 115 are shown. The UEs 115 described herein may be capable of communicating with various types of devices, such as other UEs 115, base stations 105, or network devices (e.g., core network nodes, relays, integrated access and backhaul (IAB) nodes, or other network devices), as described with respect to FIG. Figure 1 shown.

[0047] The base stations 105 can communicate with the core network 130, or communicate with each other, or perform both operations described above. For example, the base stations 105 can interface with the core network 130 via one or more backhaul links 120 (e.g., via S1, N2, N3, or other interfaces). The base stations 105 can 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 perform both operations described above. In some examples, the backhaul links 120 can be or include one or more wireless links.

[0048] One or more of the base stations 105 described herein may include or may be referred to by one of ordinary skill in the art as a base station transceiver, a radio base station, an access point, a radio transceiver, a Node B, an evolved Node B (eNB), a next generation Node B, or a Gigabit Node B (any of which may be referred to as a gNB), a Home Node B, a Home evolved Node B, or some other appropriate terminology.

[0049] 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 items such as appliances, vehicles, meters, and other examples.

[0050] The UE 115 described herein may be capable of communicating with various types of devices, such as other UEs 115, which may sometimes act as relays, as well as base stations 105 and network equipment (including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, among other examples), as described with respect to FIG. Figure 1 shown.

[0051] 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" can refer to a collection of radio frequency spectrum resources having a defined physical layer structure for supporting the communication link 125. For example, a carrier used for the communication link 125 can include a portion of a radio frequency spectrum band (e.g., a bandwidth part (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 can carry acquisition signaling (e.g., synchronization signals, system information), control signaling to coordinate operation for the carrier, user data, or other signaling. The wireless communication system 100 can support communication with the UE 115 using carrier aggregation or multi-carrier operation. Depending on the carrier aggregation configuration, the UE 115 can be configured with multiple downlink component carriers and one or more uplink component carriers. Carrier aggregation can be used with both frequency division duplex (FDD) component carriers and time division duplex (TDD) component carriers.

[0052] In some examples (e.g., in a carrier aggregation configuration), a carrier may also have acquisition signaling or control signaling to coordinate operations with respect to 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 grid for discovery by a UE 115. A carrier may operate in a standalone mode, where the UE 115 performs initial acquisition and connection via the carrier, or a carrier may operate in a non-standalone mode, where a different carrier (e.g., of the same or different radio access technology) is used to anchor the connection.

[0053] 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).

[0054] A carrier may be associated with a particular bandwidth of radio frequency spectrum, and in some examples, the carrier bandwidth may be referred to as the "system bandwidth" of the carrier or wireless communication system 100. For example, the 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 the carrier bandwidth.

[0055] The signal waveform transmitted on the carrier may be composed of multiple subcarriers (e.g., using a multicarrier modulation (MCM) technique 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 comprise one symbol period (e.g., the duration of one modulation symbol) and one subcarrier, where the symbol period and 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 may 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 communications with the UE 115.

[0056] 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 the UE 115 may be limited to the one or more active BWPs.

[0057] Time intervals for the base station 105 or the UE 115 may be expressed in multiples of a basic time unit (which may, for example, refer to a sampling period of T_s=1 / ((Δf_max·N_f) seconds, where Δf_max may represent the maximum supported subcarrier spacing and N_f may represent the maximum supported discrete Fourier transform (DFT) size). Time intervals of communication resources may be organized according to radio frames, each having a specified duration (e.g., 10 milliseconds (ms)). Each radio frame may be identified by a system frame number (SFN) (e.g., ranging from 0 to 1023).

[0058] Each frame may include multiple consecutively numbered subframes or time slots, and each subframe or time slot may have the same duration. In some examples, the frame may be divided into subframes (e.g., in the time domain), and each subframe may be further divided into a 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 the cyclic prefix added in front of each symbol period). In some wireless communication systems 100, the time slot may be further divided into multiple micro-slots containing one or more symbols. Excluding the cyclic prefix, each symbol period may include one or more (e.g., N_f) sampling periods. The duration of the symbol period may depend on the subcarrier spacing or the operating band.

[0059] 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 the form of bursts of shortened TTIs (sTTIs)).

[0060] Physical channels may be multiplexed on a carrier according to various techniques. For example, physical control channels and physical data channels may be multiplexed on a downlink carrier using one or more of time division multiplexing (TDM), frequency division multiplexing (FDM), or hybrid TDM-FDM techniques. 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 the system bandwidth of a carrier or a subset of the system bandwidth. One or more control regions (e.g., CORESETs) may be configured for a group of UEs 115. For example, one or more of 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 the encoded 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 .

[0061] 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 identifier) 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 the logical communication entity operates. Depending on various factors (such as the capabilities of the base station 105), such a cell can range from covering 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 the geographic coverage area 110, as well as other examples.

[0062] A macro cell typically covers a relatively large geographic area (e.g., a radius of several kilometers) and may allow unrestricted access by UEs 115 that have a service subscription with a network provider that supports the macro cell. Small cells may be associated with lower-power base stations 105 than macro cells, and may operate in the same or different frequency bands (e.g., licensed, unlicensed) as the macro cells. Small cells may provide unrestricted access to UEs 115 that have a service subscription with a network provider, or may provide restricted access to UEs 115 associated with the small cell (e.g., UEs 115 in a closed subscriber group (CSG), UEs 115 associated with users in a home or office). A base station 105 may support one or more cells and may also support communication over one or more cells using one or more component carriers.

[0063] In some examples, a carrier may support multiple cells, and different cells may be configured according to different protocol types (e.g., MTC, narrowband IoT (NB-IoT), enhanced mobile broadband (eMBB)) that may provide access to different types of devices.

[0064] In some examples, base stations 105 can 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 can overlap, but the different geographic coverage areas 110 can be supported by the same base station 105. In other examples, overlapping geographic coverage areas 110 associated with different technologies can be supported by different base stations 105. The wireless communication system 100 can include, for example, a heterogeneous network in which different types of base stations 105 use the same or different radio access technologies to provide coverage for various geographic coverage areas 110.

[0065] Some UEs 115 may be configured to employ a mode of operation that reduces power consumption, such as half-duplex communication (e.g., a mode that supports one-way communication via transmission or reception rather than simultaneous transmission and reception). In some examples, half-duplex communication may be performed at a reduced peak rate. Other power conservation techniques for the UE 115 include entering a power-saving deep sleep mode when not engaged in active communications, operating over a limited bandwidth (e.g., according to narrowband communication), or a combination of these techniques. For example, some UEs 115 may be configured to operate using a narrowband protocol type that is associated with a defined portion or range (e.g., a set of subcarriers or resource blocks (RBs)) within a carrier, within a guard band of a carrier, or outside of a carrier.

[0066] 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. UE 115 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.

[0067] In some examples, UE 115 may also be able to communicate directly with other UEs 115 over 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 the geographic coverage area 110 of the base station 105. Other UEs 115 in such a group may be outside the geographic coverage area 110 of the 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 the D2D communication. In other cases, the D2D communication is performed between the UEs 115 without involving the base station 105.

[0068] In some systems, the D2D communication link 135 can be an example of a communication channel (such as a sidelink communication channel) between vehicles (e.g., UE 115). In some examples, the vehicles can communicate using vehicle-to-everything (V2X) communication, vehicle-to-vehicle (V2V) communication, or some combination thereof. The vehicles can signal information related to traffic conditions, signal scheduling, weather, safety, emergency situations, or any other information related to the V2X system. In some examples, the vehicles in the V2X system can communicate with roadside infrastructure (such as roadside units) or communicate with the network via one or more network nodes (e.g., base station 105) using vehicle-to-network (V2N) communication, or both.

[0069] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 may be an evolved packet core (EPC) or a 5G core (5GC), which may include at least one control plane entity (e.g., a mobility management entity (MME), an access and mobility management function (AMF)) that manages 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)) that routes packets to or interconnects to an external network. The control plane entity may manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management for UEs 115 served by base stations 105 associated with the core network 130. User IP packets may be transmitted through the user plane entity, which may provide IP address allocation and other functions. The user plane entity may be connected to the 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.

[0070] Some of the network devices, such as base stations 105, may include subcomponents such as access network entities 140, which may be examples of access node controllers (ANCs). 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 consolidated into a single network device (e.g., base station 105).

[0071] The wireless communication system 100 can operate using one or more frequency bands, typically in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). Typically, 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 can be blocked or redirected by buildings and environmental features, but the waves can penetrate structures sufficiently for macro cells to provide service to UEs 115 located indoors. Transmissions using UHF waves can be associated with smaller antennas and shorter distances (e.g., less than 100 kilometers) compared to transmissions using the lower frequencies and longer waves of the high frequency (HF) or very high frequency (VHF) portions of the spectrum below 300 MHz.

[0072] The wireless communication system 100 may also operate in the super high frequency (SHF) region using frequency bands from 3 GHz to 30 GHz (also known as centimeter bands) or in the extremely high frequency (EHF) region of the spectrum (e.g., from 30 GHz to 300 GHz) (also known as millimeter bands). 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 corresponding devices may be smaller and more closely spaced than UHF antennas. In some examples, this may facilitate the use of antenna arrays within the device. However, the propagation of EHF transmissions may be subject to even greater atmospheric attenuation and shorter distances than SHF or UHF transmissions. The technology disclosed herein may be employed across transmissions using one or more different frequency regions, and the designated use of frequency bands spanning these frequency regions may vary depending on the country or regulatory agency.

[0073] 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. If 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 the unlicensed band can be based on a carrier aggregation configuration in combination with component carriers operating in a licensed band (e.g., LAA). Operations in the unlicensed spectrum can include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, among other examples.

[0074] The base station 105 or UE 115 may be equipped with multiple antennas, which may be used to employ techniques 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 in different geographical locations. The base station 105 may have an antenna array having a number of rows and columns of antenna ports 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 transmitted via the antenna ports.

[0075] The base station 105 or UE 115 can use MIMO communication to take advantage of multipath signal propagation and increase spectral efficiency by sending or receiving multiple signals via different spatial layers. Such a technique may be referred to as spatial multiplexing. For example, a transmitting device may send multiple signals via different antennas or different combinations of antennas. Similarly, a receiving device may receive multiple signals 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 techniques include 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).

[0076] Beamforming (which may also be referred to as spatial filtering, directional transmission, or directional reception) is a signal processing technique that can be used at a transmitting device or a receiving device (e.g., a 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 can be achieved by combining signals transmitted via antenna elements of an antenna array so that some signals propagating at a particular orientation relative to the antenna array experience constructive interference, while other signals experience destructive interference. Adjustments to signals transmitted via antenna elements can include the transmitting device or the receiving device applying an amplitude offset, a phase offset, or both to the signals carried via the antenna elements associated with the device. Adjustments associated with each of the antenna elements can 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).

[0077] As part of the beamforming operation, the base station 105 or the UE 115 can use beam scanning techniques. For example, the base station 105 can use multiple antennas or antenna arrays (e.g., antenna panels) to perform beamforming operations for directional communication with the UE 115. The base station 105 can transmit some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) multiple times in different directions. For example, the base station 105 can transmit signals according to different sets of beamforming weights associated with different transmission directions. The transmissions in different beam directions can 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 the beam direction for subsequent transmission or reception by the base station 105.

[0078] Base station 105 may transmit some signals (such as data signals associated with a particular receiving device, such as UE 115) in a single beam direction (e.g., a direction associated with the receiving device). In some examples, the beam direction associated with transmissions along the single beam direction may be determined based on signals transmitted in one or more beam directions. For example, UE 115 may receive one or more of the signals transmitted 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.

[0079] In some examples, transmissions 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 used 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 reference signals (e.g., cell-specific reference signals (CRS), channel state information reference signals (CSI-RS)) that 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 to send signals multiple times in different directions (e.g., to identify a beam direction for subsequent transmission or reception by UE 115) or to send signals in a single direction (e.g., to send data to a receiving device).

[0080] When receiving various signals (such as synchronization signals, reference signals, beam selection signals, or other control signals) from the base station 105, a receiving device (e.g., UE 115) can try multiple reception configurations (e.g., directional listening). For example, the receiving device can try multiple reception directions by receiving via different antenna subarrays, by processing the received signals according to different antenna subarrays, by receiving according to different sets of receive beamforming weights applied to the signals received at multiple antenna elements of the antenna array (e.g., different sets of directional listening weights), or by processing the received signals according to different sets of receive beamforming weights applied to the signals received at multiple antenna elements of the antenna array (any of the above operations can be referred to as "listening" according to different reception configurations or reception directions). In some examples, the receiving device can use a single reception configuration to receive along a single beam direction (e.g., when receiving data signals). 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, highest signal-to-noise ratio (SNR), or otherwise acceptable signal quality based on listening according to multiple beam directions).

[0081] The wireless communication system 100 can be a packet-based network operating according to a layered protocol stack. In the user plane, communications at the bearer or packet data convergence protocol (PDCP) layer can be IP-based. The radio link control (RLC) layer can perform packet segmentation and reassembly for transmission on logical channels. The medium access control (MAC) layer can perform priority handling and multiplexing of logical channels to transport channels. The MAC layer can also use error detection technology, error correction technology, or both to support retransmission at the MAC layer to improve link efficiency. In the control plane, the radio resource control (RRC) protocol layer can provide the establishment, configuration, and maintenance of an RRC connection (which supports radio bearers for user plane data) between the UE 115 and the base station 105 or the core network 130. At the physical layer, transport channels can be mapped to physical channels.

[0082] UE 115 and base station 105 can support retransmission of data to increase the likelihood that the data is successfully received. Hybrid automatic repeat request (HARQ) feedback is a technique for increasing the likelihood that data is correctly received on communication link 125. HARQ can include a combination of error detection (e.g., using a cyclic redundancy check (CRC)), forward error correction (FEC), and retransmission (e.g., automatic repeat request (ARQ)). HARQ can improve throughput at the MAC layer under poor radio conditions (e.g., low signal to noise conditions). In some examples, a device can support same-slot HARQ feedback, wherein the device can provide HARQ feedback in a particular time slot for data received in previous symbols in that time slot. In other cases, the device can provide HARQ feedback in subsequent time slots or according to some other time interval.

[0083] Each of the UEs 115 may be assigned to or otherwise configured in one or more groups according to one or more resource allocation schemes as described herein. For example, a wireless device (such as a base station 105 or a group leader UE 115, among other examples of wireless devices) may assign a set of UEs 115 to a group. The set of UEs 115 may transmit sidelink control signals (e.g., including sidelink requests, sidelink responses, and sidelink acknowledgement messages) based on the assigned groupings. For example, one or more control blocks in a frequency band corresponding to the group may be allocated to at least some of the UEs 115 in the set of UEs 115. The UEs 115 may use the allocated control blocks of the frequency band to monitor communications or to send communications to other UEs 115 in the group (or both). In some examples, the groups, control blocks, or both may be allocated based on the priority of communications between one or more UEs 115. For example, if UE 115 is a relatively low-priority UE 115 (e.g., UE 115 may have relatively low-priority communications), UE 115 may be assigned to a group with a lower frequency band. Additionally or alternatively, for example, if UE 115 has a relatively high priority, a control block that appears earlier in the control resource may be allocated to UE 115. In some examples, the UEs 115 of each group may be updated (e.g., based on a request to be grouped with UEs 115 in another group or after a determined amount of time, among other examples), or may have different sizes (e.g., different numbers of UEs 115 in a group or different numbers of control blocks allocated to UEs in different groups or to UEs in the same group). Additionally or alternatively, UE 115 may be included in multiple groups based on one or more capabilities of UE 115 (such as the number of beams available for sidelink communications). Such techniques may achieve one or more advantages, such as more efficient communications, resource utilization, and reliable communications, among other advantages.

[0084] Figure 2 An example of a wireless communication system 200 that supports control signaling techniques for sidelink communications 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.

[0085] The base station 205 can serve one or more UEs 215 located within the geographic area 202-a. For example, the base station 205 can serve UE 215-a, UE 215-b, UE 215-c, UE 215-d, or UE 215-e. The UEs 215 can communicate with each other via one or more sidelink connections 220 (e.g., sidelink connection 220-a, sidelink connection 220-b, sidelink connection 220-c, sidelink connection 220-d, sidelink connection 220-e, sidelink connection 220-f, or sidelink connection 220-g). The base station 205 can communicate with the UEs 215 via one or more bidirectional communication links 210 (e.g., bidirectional communication link 210-a, bidirectional communication link 210-b, bidirectional communication link 210-c, bidirectional communication link 210-d, or bidirectional communication link 210-e).

[0086] In some examples, base station 205 can allocate sidelink resources (e.g., shared resources for sidelink communication between UEs 215) to UE 215 via one or more of bidirectional communication links 210. In some examples, the shared resources may include data resources and control resources. UE 215 can communicate with each other (e.g., via sidelink connection 220) to claim at least some of the data resources. UE 215 can split the data resources (e.g., dynamically or as instructed by one or more other devices (such as base station 205)) into sub-pools, each of which can be shared, can be of different sizes, or both, as well as other differences or similarities. In some examples, UE 215 can claim a sub-pool of data resources. Base station 205 can restrict UE 215 from claiming the entire pool of shared resources, and can allow UE 215 to claim one or more sub-pools (e.g., an overall subset) of the shared resources.

[0087] Other techniques for determining which of the UEs 215 will have access to data resources may result in system inefficiencies. In some examples, the base station 205 may communicate with the UEs 215 via a bidirectional communication link 210 and may allocate one or more of the shared resources to one or more corresponding UEs 215 for each sidelink communication. However, such sidelink communication allocations may result in an unnecessary increase in signaling overhead and a reduction in system efficiency. In some examples, the UEs 215 may compete for data resources autonomously. In such examples, resources may not be fully utilized (resulting in inefficient use of data resources) or may be over-utilized (resulting in increased interference and failed transmissions and a reduced user experience). That is, if the UE is configured to be overly cautious about avoiding conflicts, or is not configured to properly use spatial resources (e.g., beamforming techniques), resources otherwise available may remain unused. Additionally or alternatively, if too many UEs transmit concurrently on the same shared resources (e.g., on beams that interfere with each other), link quality may degrade, which may result in one or more of: failed transmissions, multiple retransmissions, increased system latency, or other issues. Therefore, to increase system efficiency and reduce interference, among other advantages, UEs may dynamically claim shared resources, e.g., based on scheduling, and may communicate with each other to identify and reduce interference while efficiently utilizing available shared resources.

[0088] UE 215 may determine a priority schedule that may determine the order in which UE 215 may take turns attempting to claim data resources. UE 215 may communicate with each other autonomously (e.g., without formal scheduling by base station 205) using control resources according to the priority schedule. In some examples, base station 205 may send an indication of priority scheduling to UE 215. In some examples, UE 215 may dynamically determine priority scheduling (e.g., without receiving an indication of priority scheduling from the base station). In some examples, priority scheduling may be associated with one or more frequency bands (e.g., a higher frequency band may correspond to a relatively higher priority UE group), one or more control blocks (e.g., a control block appearing in an earlier time slot may correspond to a relatively high priority UE, such as a UE with relatively high priority communication, compared to a control block appearing in a later time slot), or both.

[0089] Control resources may include resources allocated for signal types. For example, UE 215 may determine (e.g., via preconfigured information or signaling from base station 205) resources for sidelink request messages, positive sidelink response and negative sidelink response messages, and sidelink acknowledgement messages, as described with reference to FIG. Figure 3The control resources may include multiple portions of resources, which may be referred to as control blocks. Each control block in the control resources may include resources for one or more of a sidelink request message, a positive sidelink response message, a negative sidelink response message, or a sidelink acknowledgment. A UE 215 scheduled for a particular control block according to priority scheduling may send a sidelink request message to a target UE 215 on the control block. The sidelink request message may indicate that the UE 215 intends to send a data message on a portion of the shared resource.

[0090] If UE 215 was scheduled to receive a data transmission on a portion of the data resources on a previous control block, UE 215 may have priority and may be able to object to the transmission being scheduled in the current control block. For example, on a first control block, UE 215-a may communicate with UE 215-b and may determine to use a portion of the data resources to send a data transmission. UE 215-b may receive the data transmission from UE 215-a using a first receive beam. On a second control block, UE 215-d may be scheduled according to priority scheduling, and UE 215-d may send a sidelink request message to UE 215-e. UE 215-e may receive the sidelink request message using a second receive beam. If UE 215-e is available for transmission, UE 215-e may send a positive sidelink response message. However, UE 215-b may be monitoring using the first receive beam on the second control block and may receive the sidelink request message on the first receive beam. UE 215-b may determine that the data transmission from UE 215-d to UE 215-e may interfere with the data transmission previously scheduled on the first receive beam. In such an example, because UE 215-a is a higher priority UE 215 than UE 215-d (e.g., because UE 215-a scheduled UE 215-b for data transmission on the previous control block), UE 215-b may send a negative sidelink response message. UE 215-d may receive the negative sidelink response message and may determine to abort or avoid sending the data transmission to UE 215-e.

[0091] In some examples, the wireless communication system 200 can implement multiplexing techniques for control signaling to achieve more efficient communication as described herein. For example, UEs 215 can be configured in one or more groups based on a resource allocation scheme. A wireless device (such as a base station 205, a group leader UE 215, and other examples of wireless devices) can assign a set of UEs 215 to a group. In some examples, at least one UE 215 can receive a signal from the base station 205 indicating that the UE 215 can act as a group leader and assign each set of UEs 215 in one or more sets of UEs 215 to a corresponding group. The UE 215 acting as the group leader can then send an indication to the base station 205 of the set of UEs 215 that has been assigned to the group. In some examples, the base station 205 can configure one or more parameters associated with the shared resource pool (including control resources and data resources) based on various aspects of the assigned grouping (such as the number of UEs in one or more groups or the number of UE groups, among other examples). Additionally or alternatively, one or more of the UEs 215 may autonomously (eg, without receiving an instruction signal from the base station 205) act as a group leader and assign a set of UEs 215 to one or more groups.

[0092] The set of UEs 215 may transmit sidelink control signals (e.g., sidelink requests, sidelink responses, and sidelink confirmation messages) based on the assigned group associated with the set of UEs 215. For example, one or more control blocks in a first frequency band corresponding to the group may be allocated to one or more UEs 215 in the set of UEs 215. UEs 215 may use the allocated control blocks of the frequency band to monitor communications or send communications (or both) to other UEs 215 in the group. In some examples, groups, control blocks, or both may be allocated based on one or more priorities of one or more UEs 215 (e.g., UEs 215 with relatively high priority communications or relatively low priority communications). For example, if UE 215 is a relatively low priority UE 215, UE 215 may be assigned to a group with a lower frequency band. Additionally or alternatively, for example, if UE 215 has a relatively high priority, a control block that appears earlier in the control resource may be allocated to UE 215. In some examples, the groups of UEs 115 can be updated (e.g., based on a request to be grouped with UEs 215 in another group or after a determined amount of time, among other examples), or can have different sizes (e.g., different numbers of UEs 215 or control blocks). Additionally or alternatively, UEs 215 can be included in multiple groups based on one or more capabilities of the UEs 215, such as the number of beams available for sidelink communication. Such techniques can achieve one or more advantages, such as more efficient communication and resource utilization, among other advantages.

[0093] Figure 3 An example of a resource allocation scheme 300 that supports control signaling techniques for sidelink communications in accordance with aspects of the present disclosure is shown. In some examples, the resource allocation scheme 300 can implement aspects of wireless communication systems 100 and 200.

[0094] In some examples, multiple UEs 315 can communicate with each other via one or more sidelink connections. The base station 105 can allocate shared resources to one or more of the UEs 315. The shared resources can include control resources 305 and a shared data resource pool 310. The UEs 315 can determine which UE 315 will transmit and receive in the shared data resource pool 310 without additional signaling from the base station 105, and can increase the number of transmissions in the shared data resource pool 310 while reducing interference, among other advantages. The UEs 315 can also perform a beam training process to determine which transmit beams and receive beams to use for communicating with each other. The UEs 315 can utilize these beams when sending control signals as well as data.

[0095] UE 315 can communicate with each other on control resources 305 to obtain data resources from shared data resource pool 310. Control resources may include one or more control blocks. Each control block may have a duration (e.g., 1 time slot). One or more control blocks may include resources allocated for transmitting different types of signals. For example, each control block may include resources allocated for one or more of the following: sidelink request message 325 (which may also be referred to as sidelink request), positive sidelink response message 330 (which may also be referred to as positive sidelink response), negative sidelink response message 335 (which may also be referred to as negative sidelink response), or sidelink confirmation message 340 (which may also be referred to as sidelink confirmation). UE 315 may send sidelink request 325 to target UE 315 to obtain data resources for data transmission. Sidelink request 325 may include the UE identifier of target UE 315. Each of the other UEs 315 can monitor the sidelink request 325, for example, to determine whether the corresponding other UE 315 is the target UE 315, or to determine whether the data transmission from the sidelink request sending UE 315 will cause interference above a threshold to previously scheduled data transmissions associated with the corresponding other UE 315.

[0096] In response to receiving the sidelink request 325, the target UE 315 may send a positive sidelink response 330 to accept the data transmission. For example, if the target UE 315 determines that it has not been scheduled to receive a data transmission, or if a higher priority transmission will not cause interference above a threshold, among other examples, the target UE 315 may send a positive sidelink response message. The non-target UE 315 may send a negative sidelink response 335 in response to the sidelink request 325 to object to the data transmission between the UE 315 that sent the sidelink request 325 and the target UE 315. For example, if the data transmission from the UE 315 that sent the sidelink request 325 would interfere with a data transmission previously scheduled for the non-target UE, the non-target UE 315 may send a negative sidelink response 335. The positive sidelink response 330 and the negative sidelink response 335 may occupy the same time (eg, may be transmitted on overlapping time resources over a portion of the time slot 320) and may occupy different frequency resources (eg, tones).

[0097] The UE 315 that sent the sidelink request 325 may send a sidelink acknowledgment 340 to confirm the scheduled data transmission, or may refrain from sending the sidelink acknowledgment 340 to indicate that the data transmission has been aborted or that the data transmission will be refrained from. In some examples, the sidelink request-sending UE 315 may send the sidelink acknowledgment message 340 if it receives a positive sidelink response 330 from the target UE 315 and does not receive a negative sidelink response message 335. In some examples, if the UE 315 does not receive a positive sidelink response 330 from the target UE 315, or if the UE 315 receives one or more negative sidelink response messages 335 from one or more other UEs 315 (or if both occur), the UE 315 may refrain from sending the sidelink acknowledgment message and may not proceed with the data transmission.

[0098] The UEs 315 may take turns attempting to acquire data resources from the shared data resource pool 310 on the corresponding control resources 305 according to the priority scheduling. At least some, if not all, of the UEs 315 may be aware of the priority scheduling and may therefore monitor, transmit, or receive, or any combination thereof, on the resources allocated for control signals on the corresponding control blocks.

[0099] In some examples, the base station 105 may send a downlink indication of priority scheduling. For example, the priority scheduling may indicate that UE 315-a is assigned a control block on time slot 320-a of control resource 305-a, UE 315-b is assigned a control block on time slot 320-b of control resource 305-a, and UE 315-c is assigned a control block on time slot 320-c of control resource 305-a. One or more of the UEs 315 may attempt to acquire data resources from the shared data resource pool 310-a only on their respective assigned control blocks. That is, on time slot 320-a, UE 315-a may send a sidelink request 325, but UE 315-b and UE 315-c may refrain from or may be prohibited from sending a sidelink request message on time slot 320-a. Similarly, UE 315-b may send a sidelink request 325 on time slot 320-b, and UE 315-c may send a sidelink request 325 on time slot 320-c. The same downlink indication of priority scheduling or a new indication of priority scheduling may indicate an assignment for control resource 305-a or may include a pattern or set of rules for subsequent control resources (e.g., round-robin scheduling, round-robin rules, and other examples).

[0100] In some examples, the downlink indication may indicate that UE 315-b is assigned a control block on time slot 320-d of control resource 305-b, UE 315-c is assigned a control block on time slot 320-e of control resource 305-b, and UE 315-a is assigned a control block on time slot 320-f of control resource 305-b. In some examples, UE 315 may communicate across multiple control resources 305 according to the priority schedule until base station 105 sends a new indication (e.g., including a new or updated priority schedule). In some examples, the base station may send a new indication of the priority schedule before each set of control resources 305-b.

[0101] In some other examples, the UE 315 may determine a priority schedule without input from the base station 105. For example, the UE 315 may determine a round-robin priority schedule in which the UE 315-a may be assigned a first time slot (e.g., time slot 320-a) of a first set of control resources 305-a, a third time slot (e.g., time slot 320-f) of a second set of control resources 305-b, a second time slot (not shown) of a subsequent set of control resources 305-c, and so on, across multiple sets of control resources 305-a.

[0102] A UE 315 assigned to an earlier control block than another control block may have a higher priority than a UE 315 assigned to a later control block. That is, UE 315-a may have a higher priority than UE 315-b, and if UE 315-a is scheduled for transmission on time slot 320-a, UE 315-a or a UE 315 scheduled to communicate with UE 315-a may object to the transmission scheduled by UE 315-b on time slot 320-b.

[0103] UE 315 may attempt to acquire data resources from the shared data resource pool 310 according to priority scheduling. For example, UE 315-a may send a sidelink request 325 to a target UE 315 (e.g., UE 315-c) during a first portion of a time slot 320-a according to priority scheduling. In some examples, UE 315-b and UE 315-c may steer respective receive beams toward UE 315-a based on the priority scheduling and other factors. UE 315-c may receive the sidelink request 325 during a first portion of the time slot 320-a and may send a positive sidelink response 330 during a second portion of the time slot 320-a. UE 315-b may also receive the sidelink request 325 during a first portion of the time slot 320-a. If UE 315-b determines that it has no scheduled conflicting data transmissions, among other conditions, UE 315-b may refrain from sending a negative sidelink response 335 during the second portion of time slot 320-a. During the third portion of time slot 320-a, having received a positive sidelink response 330 from UE 315-c and having not received a negative sidelink response message 335 from any of the other UEs 315 (such as UE 315-b), UE 315-a may send a sidelink acknowledgement 340 to UE 315-c. Thus, UE 315-c may be scheduled to receive a data transmission on a set or portion of data resources from the shared data resource pool 310-a on the same receive beam on which it received the sidelink request 325 and the sidelink acknowledgement message 340.

[0104] In time slot 320-b, UE 315-b may attempt to schedule a data transmission with a fourth UE 315 (not shown). UE 315-b may send a sidelink request 325 to the fourth UE 315 in a first portion of time slot 320-b. In a second portion of time slot 320-b, the fourth UE may send a positive sidelink response 330 to UE 315-b. UE 315-c may monitor for sidelink request 325 from UE 315-b in the first portion of time slot 320-b using the same receive beam on which UE 315-a scheduled a data transmission in time slot 320-a. If UE 315-c receives a sidelink request 325 from UE 315-b on the beam in time slot 320-b, UE 315-c may measure, among other things, interference with potential data transmissions from UE 315-b to the fourth UE on the receive beam. If the interference is above a threshold (e.g., a potential data transmission would result in a relatively low signal-to-interference-plus-noise ratio (SINR) on the receive beam), UE 315-c may object to the scheduling of the data transmission between UE 315-b and target UE 315 for time slot 320-b. That is, UE 315-c may send a negative sidelink response 335 on time slot 320-b because UE 315-c is scheduled by UE 315-a, which has a higher priority than UE 315-b. Upon receiving the negative sidelink response 335 on the second portion of time slot 320-b, UE 315-b may abort the data transmission and may refrain from sending the sidelink acknowledgement 340 on the third portion of time slot 320-b.

[0105] Another UE 315 that received the sidelink request 325 in time slot 320-b may determine that no data transmission is scheduled based on not receiving the sidelink acknowledgement 340 in the third portion of time slot 320-b. Any UE 315 among the UEs 315 for which a data transmission has been successfully scheduled (e.g., UE 315-a) may perform the data transmission using data resources acquired from the shared data resource pool 310-a. As described herein, on control resources 305-b, UE 315 may acquire data resources from the shared data resource pool 310-b according to priority scheduling.

[0106] UE 315 can determine which one or more beams to use to communicate with other UEs 315 based on one or more beam training procedures. For example, if UE 315 is not scheduled to receive any data transmission, it can monitor for sidelink requests 325 on the corresponding control block by training its receive beam on a UE 315 that is scheduled to send a sidelink request 325, for example, according to priority scheduling. That is, both UE 315-b and UE 315-c can steer their receive beams to receive the sidelink request 325 from UE 315-a, for example, based on a previously performed beam training procedure. Thus, UE 315-b and UE 315-c can determine whether each is the target UE 315 by receiving the sidelink request 325 on time slot 320-a.

[0107] If UE 315 is already scheduled to receive data transmissions on a receive beam, it may monitor for sidelink request messages 325 using that receive beam. For example, if UE 315-a schedules UE 315-c for data transmissions on a first receive beam during time slot 320-a, UE 315-c may monitor for subsequent sidelink request messages 325 on control resource 305-a on the first receive beam. By monitoring sidelink request messages 325 using the first receive beam, UE 315-c may determine whether a potential subsequent schedulable data transmission will interfere with a previously scheduled data transmission using the first receive beam. UE 315-c may determine whether to send a negative sidelink response 335 based on monitoring sidelink request messages 325 on the first receive beam, among other actions.

[0108] In some examples, the resource allocation scheme 300 can support FDM techniques for control signaling on the control resources 305 to achieve more efficient communication as described herein. For example, UEs 315-a, 315-b, and 315-c can represent a first group of UEs 315, and the control resources 305-a and 305-b can be located in a first frequency band corresponding to the first group. In other words, the resource allocation scheme 300 can illustrate an example of operation in a first frequency band for a first group of UEs 315. In some examples, a wireless device (such as a base station 205 or a group leader UE 315, among other examples of wireless devices) can assign a UE 315 to the first group. The UE 315 can transmit a sidelink control signal (e.g., a sidelink request 325, a positive sidelink response 330, a negative sidelink response 335, or a sidelink confirmation message 340) in the first frequency band of the control resources 305 in a corresponding time slot 320 assigned to the corresponding UE 315 of the first group. In some examples, the groups, control blocks, or both can be allocated based on the priority associated with the UEs 315. For example, a higher frequency band can be allocated to the UEs 315 in the first group based on the relatively higher priority scheduling of the UEs 315. In some examples, the UEs 315 can be allocated control blocks that occur earlier in the control resources 305 based on the priority of the UEs 315 in the group (such as the priority scheduling described herein). For example, in the control resources 305-a, the UE 315-a can have a relatively higher priority and can be assigned to the time slot 320-a based on the higher priority.

[0109] In some examples, the groups of UEs 315 can be reassigned. For example, different control blocks can be assigned to UEs 315, such as allocating time slot 320-d in control resource 305-b to UE 315-b instead of time slot 320-b in control resource 305-a. Additionally or alternatively, one or more of the UEs 315 can be assigned to different groups. For example, UE 315-a can have communications for UE 315-d (not shown) and can request to be grouped with UE 315-d. The wireless device that determines the grouping can assign UE 315-d to the group (such as in time slot 320 of control resource 305-b in the first frequency band), or the wireless device can assign UE 315-a to another group that includes UE 315-d. In some examples, such reassignment of groups of UEs 315 can be performed relatively frequently to provide reliable communication between UEs 315 in the sidelink communication system.

[0110] Figure 4An example of a resource allocation scheme 400 supporting control signaling techniques for sidelink communications according to aspects of the present disclosure is shown. In some examples, the resource allocation scheme 400 can be implemented by aspects of the wireless communication system 100 or 200 or the resource allocation scheme 300. For example, the control resources 405 and the shared data resource pool 425 can be referenced to Figure 3 Examples of aspects of the control resource 305 and shared data resource pool 310 are described. Additionally or alternatively, individual UEs (such as UE 315) may use the same methods as described with reference to Figure 3 For example, the sidelink request 430, the positive sidelink response 435, the negative sidelink response 440, and the confirmation indication message 445 can be referenced to Figure 3 3. An example of a sidelink request 325, a positive sidelink response 330, a negative sidelink response 335, and a sidelink confirmation message 340 is depicted. In general, resource allocation scheme 400 may illustrate an example of multiplexing control signaling (such as FDM control signaling and TDM control signaling) as described herein to achieve increased system efficiency.

[0111] The control resource 405 may include a control block 410. The control block 410 may be assigned to a UE in a wireless communication system, which may enable the UE to reserve resources of the shared data resource pool 425. For example, the control block 410 may be as described with reference to Figure 3 An example of a control block is described. A control block 410 can correspond to one or more frequency resources 415 (e.g., frequency resources 415-a in a first frequency band) to increase resource utilization and system efficiency by enabling multiple UEs to perform control signaling in the same time slot 420. In some examples, a corresponding control block 410 can be assigned to each UE in the system to coordinate resource reservation and data transmission with respect to a shared data resource pool 425.

[0112] For example, concurrently with a second UE assigned to control block 410-d sending or receiving control information on frequency resource 415-b on time slot 420-a, a first UE assigned to control block 410-a may send or receive control information on frequency resource 415-a on time slot 420-a. In some examples, each control block 410 may be associated with a transmission time interval duration. For example, control block 410-c may include a time slot for sidelink request 430, a time slot for positive sidelink response 435 and negative sidelink response 440, and a time slot for confirmation indication message 445. Control block 410-c may also include one or more gaps 450 (e.g., gap 450-b may represent a time slot provided to enable the UE to accurately decode positive sidelink response and negative sidelink response, among other examples).

[0113] UEs may be assigned to one or more groups corresponding to frequency resources 415. For example, a set of UEs may be assigned to a first group corresponding to frequency resources 415-c by another wireless device (e.g., a base station 105 or another UE (such as a group leader UE)). The wireless device may configure the set of UEs with the first group by indicating a group identifier (e.g., as part of a downlink configuration message). Additionally or alternatively, the wireless device may indicate frequency resources 415 corresponding to the first group, and the UEs in the first group may be configured to determine the assignment based on frequency or based on other communications with other UEs in the first group, as well as other factors. In some examples, the first group may perform as described with reference to Figure 3 One or more beam training processes are described. For example, a UE may be assigned a control block 410-g in a frequency resource 415-c and may train one or more transmit beams or receive beams to communicate with other UEs having a corresponding assigned control block 410 in the frequency resource 415-c. In other words, a UE in a first group may send a sidelink request 430 to other UEs in the first group to use a shared data resource pool 425 for communication between the UEs in the first group. In some examples, a UE may be assigned to one or more groups based on one or more capabilities of the UE. For example, a UE may have the ability to utilize only a single receive beam or transmit beam at a given time and may be assigned to a single group. In some other examples, a UE may be capable of using multiple receive beams or transmit beams simultaneously and may be assigned to more than one group. For example, a UE may monitor for transmissions (such as sidelink requests) across multiple frequency resources 415 (in other words, multiple frequency bands), or a UE may send transmissions (such as sidelink responses) across multiple frequency resources 415, as well as other examples of communication across multiple groups.

[0114] The set of UEs may be assigned to a group corresponding to frequency resources 415 based on one or more factors. For example, the set of UEs may be assigned to the group based on a priority associated with one or more of the UEs in the group. In some examples, the group corresponding to frequency resources 415-a may be associated with a higher priority than the group corresponding to frequency resources 415-b based on frequency resources 415-a being relatively higher in frequency than frequency resources 415-b. For example, in some examples, based on a priority scheduling determined by the UE (e.g., based on an indication from a base station or determined autonomously by the UE), a UE assigned to control block 410-a may have a higher priority than a UE assigned to control block 410-d. Additionally or alternatively, control blocks 410 may be assigned to UEs within a group based on the relative priorities of the UEs within the group. For example, if a UE in a group corresponding to frequency resource 415-a has a higher priority (e.g., according to a priority schedule indicated by a base station or determined by UEs in the group of UEs) than another UE in the group assigned to a control block 410-b that appears later in control resource 405, then the UE may be assigned the control block 410-a that appears earlier in control resource 405. In some examples, a set of UEs may be assigned to a group based on their location. For example, a wireless device may group a set of UEs based on their proximity to one another (e.g., the UEs in the group of UEs may be relatively close to one another in a geographic area and relatively likely to have communication with one another). In some examples, the wireless device assigning the UEs to a group may indicate a regrouping of some or all of the UEs. In such examples, the UEs may maintain their group until an indication is received.

[0115] In some examples, the control resources 405 can be divided into one or more frequency resources 415, and the shared data resource pool can also be divided into one or more frequency resources 415. For example, a group of UEs assigned to frequency resource 415-a can attempt to reserve resources of the shared data resource pool 425 in frequency resource 415-a. In some other examples, the shared data resource pool 425 is not divided into frequency resources 415. For example, a UE assigned to control block 410-g and a UE assigned to control block 410-d can attempt to reserve or utilize any (or all) data resources in the shared data resource pool 425 (e.g., across frequency resources 415). In some examples, two UEs in different groups can attempt to reserve the same resources in the shared resource pool 425. In some such examples, the two UEs can communicate using the same resources based on an interference measurement satisfying a threshold (e.g., the interference measurement being below the threshold). In some other examples, the UE of the two UEs assigned to the control block 410 at the higher frequency may have a higher priority and may successfully reserve resources of the shared resource pool 425 , as described above.

[0116] Figure 5 An example of a resource allocation scheme 500 supporting control signaling techniques for sidelink communications according to aspects of the present disclosure is shown. In some examples, the resource allocation scheme 400 can be implemented by aspects of the wireless communication system 100 or 200 or the resource allocation scheme 300 or 400. For example, the control resource 505 and the shared data resource pool 525 can be referenced to Figure 3 and 4 Examples of various aspects of the control resource 305 or 405 and the shared data resource pools 310 and 425 are described.

[0117] In the example shown, resource allocation scheme 500 may be associated with control resource 505-a and control resource 505-b. Control resource 505 may include control block 510. Control block 510 may be a reference to Figure 45. An example of a control block 410 is described. For example, one or more of the control blocks 510 can be assigned to a UE in a wireless communication system, which can enable the UE to reserve resources of the shared data resource pool 525. The control blocks 510 in various frequency resources 515 can be allocated to the UE based on one or more groups. For example, the UE can be assigned to a first group corresponding to the frequency resource 515-a, and one or more control blocks 510-a, 510-b, or 510-c can be allocated to the UE based on, for example, a priority associated with the UE. In other words, the control blocks 510 included in the first frequency band indicated by the frequency resource 515-a can be allocated to the first UE group. The UEs in the first group can attempt to send control signals to other UEs in the first group or monitor control signals from other UEs in the first group in order to use the shared data resource pool 525 for subsequent communications between the UEs in the first group.

[0118] In some examples, different groups of UEs corresponding to various frequency resources 515 can be updated (in other words, a configuration device (such as a base station or group leader UE) can update, for example, reassign or shuffle the groups of UEs). For example, a first UE assigned to control block 510-a can have one or more communications for a second UE assigned to control block 510-d. In some examples, the first UE may not be able to reserve resources of the shared data resource pool 525 to send communications to the second UE because control block 510-a and control block 510-d appear on the same time slot 520-a. In such an example, the first UE can indicate a request for a general update of the UE grouping (or more specifically, grouping with the second UE in control resource 505-b) in order to send a sidelink request to the second UE as the target UE. The wireless device (such as base station 105) can update the group so that the same group can be assigned to the first UE and the second UE based on the indication. For example, control block 510-q may be allocated to a first UE and control block 510-r may be allocated to a second UE in frequency resource 515-c, which may enable the first UE to reserve resources for communication with the second UE. In some examples, such updates to the groups may also be based on changes in UE movement or location, network operating parameters, priorities of UEs in different groups, priorities of UEs in the same group, and other factors or any combination thereof. Additionally or alternatively, the wireless device may update the groups of UEs relatively frequently, for example, to enable UEs in different groups to communicate with each other, which may result in reliable sidelink communication while maintaining relatively high utilization of control resources 505.

[0119] In some examples, the groups of UEs can be of different sizes. Resource allocation scheme 500 can illustrate an example in which a first group of UEs associated with frequency resources 515-c can have a different number of UEs and corresponding control blocks 510 than a second group of UEs associated with frequency resources 515-b. For example, the first group can include four control blocks 510-p, 510-q, 510-r, and 510-s, which can be allocated to the four UEs in the first group, while the second group can include three control blocks 510-m, 510-n, and 510-o, which can be allocated to the three UEs in the second group, but such numbers are provided as illustrative examples, and it should be understood that the groups can include any number of UEs, control blocks 510, or any combination thereof.

[0120] In some examples, the control blocks of the first group and the control blocks of the second group can be aligned in time (e.g., the last control block 510-s of the first group and the last control block 510-o of the second group can appear in the same time slot 520-f). In such an example, control block 510-p can appear in time slot 520-g so that control signaling assigned by the UE to control block 510-p can be transmitted concurrently with one or more data transmissions using the shared data resource pool 525. For example, one or more other UEs in the system may have reserved data block 530-a, data block 530-b, or both that appear in time slot 520-g. One or more other UEs can transmit data on data block 530 in time slot 520-g concurrently with the UE assigned to control block 510-p transmitting control signals. In some examples, the UE assigned to control block 510-p can have the highest priority among the group of UEs, for example, because UEs assigned earlier control blocks have a higher priority than UEs assigned later control blocks. In some other examples, the first control block 510 - q of the first group and the first control block 510 - m of the second group may occur on the same time slot 520 - d , and the control block 510 - p may occur after the time slot 520 - f .

[0121] Figure 6 An example of a wireless communication system 600 supporting control signaling techniques for sidelink communications according to aspects of the present disclosure is shown. In some examples, the wireless communication system 600 can implement aspects of the wireless communication system 100 or 200. The wireless communication system 600 can be associated with an example scenario of communications according to aspects of one or more resource allocation schemes (e.g., resource allocation schemes 300, 400, or 500) as described herein.

[0122] The base station 605 can communicate with one or more of the UEs 615, for example, by transmitting downlink signals on one or more beams 610. For example, the base station 605 can communicate with the UE 615-a on beam 610-a, can communicate with the UE 615-b on beam 610-b, can communicate with the UE 615-c on beam 610-c, and can communicate with the UE 615-d on beam 610-d. In some examples, the base station 605 can allocate shared resources for sidelink communications between the UEs 615. The shared resources can include control resources (including multiple control blocks) and data resources, as described with reference to FIG. Figure 3 The UE 615 may identify a priority schedule that may indicate a relative priority of one or more UEs 615 (e.g., the priority schedule may indicate which UE 615 may attempt to claim data resources by sending a sidelink request on each control block of the control resource). The base station 605 may send the priority schedule to the UE 615, or the UE 615 may determine the priority schedule autonomously or based on a preconfigured priority schedule, as well as other examples, as described with reference to Figure 3 As described. The UEs 615 may perform one or more beam training procedures to identify which beams 620 to use for communicating with each other. For example, a UE 615-b may determine which beam 620 to use for communicating with one or more UEs 615 assigned to the same group as the UE 615-b. For example, to communicate with a UE 615-a in the same group as the UE 615-b, the UE 615-b may use beam 620-b to receive sidelink transmissions from the UE 615-a or to send sidelink communications to the UE 615-a. Additionally or alternatively, a UE 615-d may be assigned to the same group as the UE 615-c and may communicate with the UE 615-c using beam 620-d. In some examples, UEs 615 in wireless communication system 600 can determine which other UEs 615 to communicate with based on grouping of UEs 615 (e.g., UEs 615 in a first group can monitor or transmit communications with other UEs 615 in the first group). Such communications can be sent or received via beams 620 on frequency bands corresponding to the respective groups.

[0123] In some examples, UE 615 may use or direct its beam 620 based on priority scheduling or previously scheduled transmissions, or both. For example, UE 615 may determine based on priority scheduling that UE 615-a is scheduled to attempt to claim data resources by sending a sidelink request on a control block (e.g., on a time slot in the control resources). Based on priority scheduling, UE 615-b may use beam 620-b trained on UE 615-a to determine whether it is the target UE 615 for UE 615-a. UE 615-c may be scheduled to receive another data transmission from UE 615-d on beam 620-c. That is, on a previous time slot, UE 615-d may have sent a sidelink request on beam 620-d to reserve half of the data resources. UE 615-c may have received the sidelink request and may have sent a positive sidelink response to UE 615-d on beam 620-c, indicating that all data resources are available for transmission to UE 615-c on beam 620-c. UE 615-d may have sent a sidelink acknowledgment to UE 615-c on beam 620-d, reserving the first half of the data resources. Therefore, on the current time slot, UE 615-c may keep beam 620-c pointed at UE 615-d and may monitor for sidelink requests (e.g., from UE 615-a) on beam 620-c.

[0124] UE 615-b may receive a sidelink request from UE 615-a for reserving a set of data resources over a first portion of a timeslot and may determine that it is available for data transmission on the set of data resources. For example, the sidelink request may indicate that half of the data resources are for reservation, and UE 615-b may determine that the entire data resources are available for receiving data transmission on beam 620-b. In such an example, over a second portion of the timeslot, UE 615-b may send an affirmative sidelink response to UE 615-a over beam 620-b. The affirmative sidelink response may indicate that the entire data resources are available for data transmission. UE 615-b may then continue to monitor for a sidelink acknowledgment indicating the reservation of the set of data resources over a third portion of the timeslot on beam 620-b.

[0125] UE 615-c may determine whether a potential transmission from UE 615-a to UE 615-b on beam 620-a will cause interference above a threshold on beam 620-c with a data transmission previously scheduled by UE 615-d. That is, UE 615-c may monitor sidelink requests from UE 615-a using beam 620-c and may perform one or more measurements to determine the interference level on beam 620-c. If UE 615-a successfully reserves a set of data resources for data transmission to UE 615-b using beam 620-a, UE 615-a will use the same beam 620-a to send the scheduled data transmission to UE 615-b. Thus, if a sidelink request on beam 620-a is received at UE 615-c on beam 620-c with a signal power above a threshold (e.g., indicating that the interference level on beam 620-c is above a threshold), then when UE 615-c is receiving a data transmission from UE 615-d, a potential data transmission from UE 615-a to UE 615-b on beam 620-a may also cause interference to UE 615-c above the threshold on beam 620-c. However, UE 615-d may have previously scheduled a data transmission on the first half of the data resources. Because the previously scheduled data transmission may have a higher priority (e.g., based on the scheduled priority), UE 615-c may object to the data transmission from UE 615-a to UE 615-b if the data transmission from UE 615-a to UE 615-b will interfere with the previously scheduled data transmission from UE 615-d.

[0126] If the measured interference level is above a threshold, UE 615-c may determine that the data transmission from UE 615-a on beam 620-a may interfere with a previously scheduled data transmission from UE 615-d to a sufficient degree (e.g., the interference level will degrade the previously scheduled data transmission). That is, the data transmission from UE 615-a to UE 615-b on the first half of the data resources may conflict with the previously scheduled data transmission from UE 615-d to UE 615-c on the same portion of the data resources. In such an example, UE 615-c may send a negative sidelink response to UE 615-a. The negative sidelink response may indicate that a particular set of data resources (e.g., the first half of the data resources) is not available for data transmission from UE 615-a to UE 615-b. Such a negative sidelink response may cause UE 615-a to avoid using the first half of the data resources for data transmission to UE 615-b. In some examples, UE 615-c may send a negative sidelink response to UE 615-a on beam 620-c. In some other examples, UE 615-c may send a negative sidelink response on another beam 620 (e.g., a beam directed toward UE 615-a to increase the likelihood that UE 615-a will receive a negative sidelink response).

[0127] UE 615-a may determine whether to send a data transmission to UE 615-b based on monitoring sidelink responses from other UEs 615. For example, UE 615-a may monitor for sidelink responses from other UEs 615 over a second portion of a time slot. UE 615-a may receive a positive sidelink response from UE 615-b on beam 620-a indicating that UE 615-b is available and able to receive a data transmission on beam 620-b (e.g., on any or all of the data resources). As described herein, if UE 615-c determines that the data transmission will not interfere above a threshold with a previously scheduled data transmission from UE 615-d on beam 620-c, UE 615-c may refrain from sending a negative sidelink response. In such an example, UE 615-a may send a sidelink acknowledgment on beam 620-a indicating a reservation for the set of data resources. For example, if UE 615-a does not receive a negative sidelink response from any of the other UEs 615, UE 615-a may send a sidelink acknowledgment indicating a reservation of any of the data resources (e.g., the first half of the data resources, the second half of the data resources, a middle portion of half of the data resources, or a non-contiguous set of resources totaling half of the data resources). Subsequently, UE 615-a may send a data transmission on the set of data resources to UE 615-b on beam 620-a. Similarly, and concurrently in some examples, UE 615-d may send a previously scheduled data transmission on a partially or fully overlapping set of data resources to UE 615-c on beam 620-d. Because UE 615-c determines that such overlapping data transmissions will not cause interference above a threshold, UE 615-b and UE 615-c may successfully receive the overlapping data transmissions, resulting in increased use of available data resources and increased system efficiency.

[0128] As described herein, if UE 615-c determines that a data transmission from UE 615-a to UE 615-b will interfere with a previously scheduled data transmission from UE 615-d on beam 620-c on a first half of the data resources, UE 615-c may send a negative sidelink response (e.g., on beam 620-c). The negative sidelink response may indicate that the first half of the data resources is not available for data transmission on beam 620-a. In such an example, the sidelink acknowledgment may indicate a set of data resources that do not conflict with the previously scheduled data transmission. For example, the sidelink acknowledgment may indicate a reservation of the second half of the data resources that does not conflict with the first half of the data resources that are not available to UE 615-a. UE 615-d may send the previously scheduled data transmission on beam 620-d on the first half of the data resources, and UE 615-a may send the data transmission on beam 620-a on the second half of the data resources. UE 615 - b and UE 615 - c may successfully receive their respective data transmissions on respective portions of the data resources without interfering with each other, thereby resulting in efficient use of the data resources while reducing the likelihood of interference and failed transmissions.

[0129] In some examples, the target UE 615 and the non-target UE 615 may have been previously scheduled to send or receive data communications on the data resources. In such an example, the target UE 615 may specify available resources in a positive sidelink response that it sends in response to a sidelink request from another UE 615, while the non-target UE 615 may specify unavailable resources in a negative sidelink response that it sends in response to a sidelink request from another UE 615. For example, UE 615-c may have been previously scheduled by UE 615-d to receive data transmission on the second half of the data resources. Similarly, UE 615-b may have been previously scheduled to send or receive data transmission (e.g., with another UE 615). In such an example, UE 615-a may send a sidelink request indicating a reservation for half of the data resources. UE 615-b may send a positive sidelink response indicating that it is available for data transmission on the first half of the data resources. UE 615-a may determine, based on the affirmative sidelink request, that UE 615-b is unavailable for data transmission on the second half of the data resources. UE 615-c may send a negative sidelink response indicating that the second half of the data resources is unavailable for data transmission. UE 615-a may determine, based on the negative sidelink response, that the second half of the data resources is unavailable for data transmission on beam 620-a. In such an example, the availability of UE 615-b does not conflict with the transmission scheduling for UE 615-c (e.g., UE 615-b is available for data transmission on the first half of the data resources, and UE 615-c has indicated that the second half of the data resources is unavailable based on a previously scheduled transmission). In such an example, UE 615-a may send a sidelink acknowledgment on beam 620-a that reserves the first half of the data resources for data transmission to UE 615-b.

[0130] In some examples, the availability of the target UE 615 may be inconsistent with a previously scheduled data transmission for the non-target UE 615. In such an example, the non-target UE may block the requested data transmission. For example, if UE 615-b is available for data transmission on the first half of the data resources and is unavailable for data transmission on the second half of the data resources, and UE 615-c has been previously scheduled to receive data transmission on the first half of the data resources, UE 615-c may send a negative sidelink response indicating that the first half of the data resources is unavailable for data transmission. Upon determining that the availability of UE 615-b partially or completely overlaps with a previously scheduled data transmission for UE 615-c (e.g., based on the negative sidelink response), UE 615-a may refrain from sending a sidelink acknowledgment and may refrain from using the data resources for transmission for a given duration (e.g., one or more time slots).

[0131] Figure 7 An example of a wireless communication system 700 supporting control signaling techniques for sidelink communications in accordance with aspects of the present disclosure is shown. In some examples, the wireless communication system 700 can implement aspects of wireless communication systems 100, 200, or 600. The wireless communication system 700 can be associated with example scenarios for communications in accordance with aspects of one or more resource allocation schemes (e.g., resource allocation schemes 300, 400, or 500) as described herein.

[0132] The base station 705 can communicate with one or more UEs 715. The base station 705 can send downlink signals to the UEs 715 on beam 710. For example, the base station 705 can communicate with the UE 715-a on beam 710-a, can communicate with the UE 715-b on beam 710-b, can communicate with the UE 715-c on beam 710-c, and can communicate with the UE 715-d on beam 710-d. In some examples, the base station 705 can allocate shared resources for sidelink communications between the UEs 715. The shared resources can include control resources (including multiple control blocks) and data resources, as described with reference to FIG. Figure 3 The UE 715 may identify a priority schedule that indicates which UE 715 may attempt to claim data resources on each control block of the control resources. The base station 705 may send the priority schedule to the UE 715, or the UE 715 may determine the priority to be scheduled autonomously or based on a preconfigured priority schedule, as well as other examples, such as those described with reference to Figure 3 At least some, if not all, of the UEs 715 may perform one or more beam training procedures to identify which beams 720 to use to communicate with each other.

[0133] For example, UE 715-b can determine which beam 720 to use to communicate with one or more UEs 715 assigned to the same group as UE 715-b. For example, to communicate with UE 715-d in the same group as UE 715-b, UE 715-b can use beam 720-b to receive sidelink transmissions from UE 715-d or send sidelink communications to UE 715-d. Additionally or alternatively, UE 715-a can be assigned to the same group as UE 715-c and can use beam 720-a to communicate with UE 715-c. In some examples, UEs 715 in the wireless communication system 700 can determine which other UEs 715 to communicate with based on the grouping of the UEs 715 (e.g., UEs 715 in a first group can monitor or send communications with other UEs 715 in the first group). Such communications may be transmitted or received via beam 720 on a frequency band corresponding to the respective group.

[0134] In some examples, UE 715 may use its beam 720 based on priority scheduling, which may be related to the UE's grouping, or previously scheduled transmissions, or both. For example, UE 715 may determine based on priority scheduling that UE 715-a is scheduled to attempt to claim data resources on a control block (e.g., on a time slot in a control resource) based on one or more of UE 715 being assigned to one or more groups, as described herein. For example, priority scheduling may indicate that UE 715 in a higher frequency band has a higher priority for reserved resources, and UE 715 in a lower frequency band may yield resources based on priority scheduling (e.g., UE 715-b may be a target UE and avoid sending a positive sidelink response, or may be a non-target UE of the higher priority group that is aware of the higher priority reservation and may send a negative sidelink response, among other examples). Such priority scheduling may enable UE 715 to avoid transmissions on the same data resources between UEs of different groups (e.g., if such transmissions may cause a relatively high amount of interference).

[0135] Based on priority scheduling, UE 715-b may use beam 720-b to determine whether it is the target UE 715 for UE 715-a. UE 715-d may be scheduled to receive another data transmission from UE 715-c on beam 720-c. That is, on a previous timeslot, UE 715-c may have sent a sidelink request on beam 720-c, UE 715-d may have received the sidelink request, and may have sent a positive sidelink response to UE 715-c on beam 720-c, and UE 715-c may have sent a sidelink acknowledgment to UE 715-d on beam 720-c. Therefore, on the current timeslot, UE 715-d may remain on beam 720-d trained on UE 715-c and may monitor for sidelink requests (e.g., from UE 715-a) on beam 720-d. In some examples, UE 715-b may also receive a sidelink acknowledgment from UE 715-c at high receive power on beam 720-b and may determine that UE 715-c has successfully reserved a subset of data resources for data transmission to be sent on beam 720-c.

[0136] UE 715-a may send a sidelink request to UE 715-b on beam 720-a. UE 715-b may monitor and receive the sidelink request on beam 720-b in the first portion of the time slot. UE 715-b may determine, based on the sidelink request, that it is the target UE 715 for UE 715-a. However, UE 715-b may also determine, based on a sidelink acknowledgment previously received from UE 715-c, that a data transmission from UE 715-c will cause a high level of interference on beam 720-b with a data transmission from UE 715-a on beam 720-b. For example, UE 715-b may perform interference level measurements (e.g., determining received power, transmitted power, SNR, SINR, and other examples) on both the sidelink acknowledgment received from UE 715-c on beam 720-b and the sidelink request received from UE 715-a.

[0137] In some examples, UE 715-b may compare the measured interference levels of UE 715-a and UE 715-c and may determine, based on the measurements, that data transmission from UE 715-a on beam 720-b will experience a higher level of interference than data transmission from UE 715-c on beam 720-b. In such an example, UE 715-b may refrain from sending a positive sidelink response on the second portion of the timeslot even though UE 715-b is available for data transmission from UE 715-a (e.g., not scheduled for data transmission). In some examples, UE 715-d may also receive a sidelink request from UE 715-a on beam 720-d. Because UE 715-d has been scheduled to receive data transmission from UE 715-c on beam 720-d, UE 715-d may send a negative sidelink response to UE 715-a.

[0138] In some examples, UE 715-a may send a data transmission based on monitoring the sidelink response (e.g., if UE 715-a receives a positive sidelink response from UE 715-b on the second portion of the time slot and does not receive a negative sidelink response from the other UE 715), or avoid sending a data transmission (e.g., if UE 715-a does not receive a positive sidelink response from UE 715-b on the second portion of the time slot, receives a negative sidelink response from the other UE 715, or a combination thereof). For example, UE 715-a may avoid sending a data transmission and may avoid sending a sidelink acknowledgment to UE 715-b on the third portion of the time slot. UE 715-b may monitor for the sidelink acknowledgment and, upon not receiving the sidelink acknowledgment, may determine not to monitor for data transmission on the subset of sidelink resources.

[0139] Figure 8 A block diagram of a device 805 supporting control signaling techniques for sidelink communications according to aspects of the present disclosure is shown. The device 805 can be an example of aspects of the UE 115 as described herein. The device 805 may include a receiver 810, a communication manager 815, and a transmitter 820. The communication manager 815 may be implemented at least in part by one or both of a modem and a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0140] The receiver 810 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 control signaling techniques for sidelink communications, among other examples). The information may be communicated to other components of the device 805. The receiver 810 may be a reference to Figure 11 Examples of various aspects of the transceiver 1120 are described. The receiver 810 may utilize a single antenna or a group of antennas.

[0141] The communication manager 815 can perform the following operations: determine shared resources for communicating on one or more sidelink communication links, the shared resources including control resources and data resources; determine a first set of control resources in a first frequency band corresponding to a first UE group, the first UE group including a first UE; send a sidelink request for a set of reserved data resources to a second UE in the first UE group on a transmit beam on a first control block of the first control resource set, wherein the first control block is allocated to the first UE; and monitor, by the first UE, one or more sidelink responses on a receive beam on the first control resource set. The communication manager 815 may also perform the following operations: determine shared resources for communicating on one or more sidelink communication links, the shared resources including control resources and data resources; determine a first set of control resources in a first frequency band corresponding to a first UE group, the first UE group including a first UE and a second UE; monitor a sidelink request for reserving a set of data resources from a second UE on a receive beam on a first control block of the first control resource set, the first control block being allocated to the second UE, and the sidelink request indicating that the first UE is a target UE of the sidelink request; and determine whether to send a sidelink response to the second UE on a transmit beam on the first control resource set based on the monitoring, the sidelink response including a positive sidelink response to the sidelink request or a negative sidelink response to the sidelink request, the positive sidelink response indicating that the set of data resources is available and the negative sidelink response indicating that the set of data resources is unavailable. The communication manager 815 may also perform the following operations: determining shared resources for communicating on one or more sidelink communication links, the shared resources comprising control resources and data resources; determining a first set of control resources in a first frequency band corresponding to a first UE group, the first UE group comprising a first UE and a second UE; monitoring a first sidelink request from a second UE on a receive beam on the first set of control resources in the first frequency band; receiving a second sidelink request from a third UE for reserving a set of data resources based on the monitoring, the second sidelink request indicating that a fourth UE is a target UE of the second sidelink request, the second UE group comprising the third UE and the fourth UE; and determining whether to send a sidelink response to the third UE based on receiving the second sidelink request, the sidelink response indicating a positive response to the second sidelink request for reserving the set of data resources or a negative response to the second sidelink request for reserving the set of data resources. The communication manager 815 may be an example of aspects of the communication manager 1110 described herein.

[0142] The communication manager 815 or its subcomponents may be implemented in hardware, in code executed by a processor (e.g., software or firmware), or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 815 or its subcomponents may be performed by a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (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 this disclosure.

[0143] The communication manager 815 or its subcomponents can be physically located at different locations, including being distributed so that portions 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 815 or its subcomponents can be separate and distinct components. In some examples, according to various aspects of the present disclosure, the communication manager 815 or its subcomponents can be combined with one or more other hardware components (including but not limited to input / output (I / O) components, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof).

[0144] The transmitter 820 can transmit signals generated by other components of the device 805. In some examples, the transmitter 820 can be co-located with the receiver 810 in a transceiver component. For example, the transmitter 820 can be a reference Figure 11 Examples of aspects of the transceiver 1120 are described. The transmitter 820 may utilize a single antenna or a group of antennas.

[0145] Figure 9 A block diagram of a device 905 supporting control signaling techniques for sidelink communications according to aspects of the present disclosure is shown. The device 905 can be an example of aspects of the device 805 or UE 115 as described herein. The device 905 may include a receiver 910, a communication manager 915, and a transmitter 940. The communication manager 915 may be implemented at least in part by one or both of a modem and a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0146] The receiver 910 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 control signaling techniques for sidelink communications, among other examples). The information may be communicated to other components of the device 905. The receiver 910 may be a reference Figure 11 Examples of various aspects of the transceiver 1120 are described. The receiver 910 may utilize a single antenna or a group of antennas.

[0147] Communications manager 915 can be an example of aspects of communications manager 815 as described herein. Communications manager 915 can include shared resource component 920, group component 925, sidelink request component 930, and sidelink response component 935. Communications manager 915 can be an example of aspects of communications manager 1110 as described herein.

[0148] Shared resource component 920 can determine shared resources for communicating on one or more sidelink communication links, the shared resources including control resources and data resources. In some examples, shared resource component 920 can determine shared resources for communicating on one or more sidelink communication links, the shared resources including control resources and data resources. In some examples, shared resource component 920 can determine shared resources for communicating on one or more sidelink communication links, the shared resources including control resources and data resources.

[0149] The group component 925 may determine a first set of control resources in a first frequency band corresponding to a first UE group, the first UE group including the first UE. In some examples, the group component 925 may determine a first set of control resources in a first frequency band corresponding to the first UE group, the first UE group including the first UE and the second UE. In some examples, the group component 925 may determine a first set of control resources in a first frequency band corresponding to the first UE group, the first UE group including the first UE and the second UE.

[0150] The sidelink request component 930 may transmit a sidelink request for reserving a set of data resources to a second UE in a first UE group on a transmit beam on a first control block of a first set of control resources, wherein the first control block is allocated to the first UE. In some examples, the sidelink request component 930 may monitor on a receive beam on a first control block of a first set of control resources for a sidelink request for reserving a set of data resources from a second UE, wherein the first control block is allocated to the second UE, and the sidelink request indicates that the first UE is a target UE of the sidelink request. In some examples, the sidelink request component 930 may monitor on a receive beam on a first set of control resources in a first frequency band for a first sidelink request from the second UE, and based on the monitoring, receive a second sidelink request for reserving a set of data resources from a third UE, the second sidelink request indicating that a fourth UE is a target UE of the second sidelink request, the second UE group including the third UE and the fourth UE.

[0151] The sidelink response component 935 can monitor one or more sidelink responses on a receive beam on a first set of control resources by a first UE. In some examples, the sidelink response component 935 can determine, based on the monitoring, whether to send a sidelink response to a second UE on a transmit beam on the first set of control resources, the sidelink response comprising a positive sidelink response to the sidelink request or a negative sidelink response to the sidelink request, the positive sidelink response indicating that the set of data resources is available and the negative sidelink response indicating that the set of data resources is not available. In some examples, the sidelink response component 935 can determine, based on receiving a second sidelink request, whether to send a sidelink response to a third UE, the sidelink response indicating a positive response to the second sidelink request for reserving a set of data resources or a negative response to the second sidelink request for reserving a set of data resources.

[0152] The transmitter 940 can transmit signals generated by other components of the device 905. In some examples, the transmitter 940 can be co-located with the receiver 910 in a transceiver component. For example, the transmitter 940 can be a reference Figure 11 Examples of various aspects of the transceiver 1120 are described. The transmitter 940 may utilize a single antenna or a group of antennas.

[0153] Figure 10 A block diagram of a communications manager 1005 supporting control signaling techniques for sidelink communications in accordance with aspects of the present disclosure is shown. Communications manager 1005 can be an example of aspects of communications manager 815, communications manager 915, or communications manager 1110 described herein. Communications manager 1005 can include a shared resource component 1010, a group component 1015, a sidelink request component 1020, a sidelink response component 1025, a group assignment component 1030, a message indication component 1035, a group resource component 1040, a sidelink acknowledgement component 1045, a shared data component 1050, and an interference component 1055. Each of these components can communicate with each other directly or indirectly (e.g., via one or more buses).

[0154] Shared resource component 1010 can determine shared resources for communicating on one or more sidelink communication links, the shared resources including control resources and data resources. In some examples, shared resource component 1010 can determine shared resources for communicating on one or more sidelink communication links, the shared resources including control resources and data resources. In some examples, shared resource component 1010 can determine shared resources for communicating on one or more sidelink communication links, the shared resources including control resources and data resources.

[0155] Group component 1015 may determine a first set of control resources in a first frequency band corresponding to a first UE group, the first UE group including a first UE. In some examples, group component 1015 may determine a first set of control resources in a first frequency band corresponding to the first UE group, the first UE group including a first UE and a second UE. In some examples, group component 1015 may receive an indication from a base station that the first UE is assigned to the first UE group, wherein determining the first set of control resources in the first frequency band is based on the indication. In some examples, group component 1015 may determine, based on the indication, that the first control block is allocated to the first UE. In some examples, group component 1015 may receive a signal from a UE indicating that the first UE is assigned to the first UE group, wherein determining the first set of control resources is based on the received signal. In some examples, a second set of control resources in a second frequency band corresponding to a second UE group is determined, wherein the second UE group includes the first UE.

[0156] In some examples, group component 1015 may include the first UE group and the second UE group. In some examples, group component 1015 may receive an indication from a base station that the first UE is assigned to the first UE group, wherein determining the first set of control resources in the first frequency band is based on the indication. In some examples, group component 1015 may determine that the first control block is allocated to the second UE based on the indication. In some examples, group component 1015 may receive a signal from a UE indicating that the first UE is assigned to the first UE group, wherein determining the first set of control resources is based on the received signal. In some examples, a second set of control resources in the second frequency band corresponding to the second UE group is determined, wherein the second UE group includes the first UE and the third UE.

[0157] In some examples, group component 1015 may receive an indication from a base station that the first UE is assigned to the second UE group, wherein determining the second set of control resources in the second frequency band is based on the indication. In some examples, group component 1015 may receive an indication from a base station that the first UE is assigned to the first UE group, wherein determining the first set of control resources in the first frequency band is based on the indication. In some examples, group component 1015 may receive a signal from the UE indicating that the first UE is assigned to the first UE group, wherein determining the first set of control resources is based on the received signal. In some examples, the signal, the indication, or both indicate that the first control block is assigned to the first UE. In some examples, the second UE group is associated with a higher priority than the first UE group, and based on the second UE group being associated with a higher priority than the first UE group, the second frequency band corresponding to the second UE group is higher in frequency than the first frequency band. In some examples, a first control block of the first control resource set is associated with a higher priority than a second control block of the first control resource set allocated to the second UE, and based on the first control block being associated with a higher priority than the second control block, the first control block precedes the second control block. In some examples, the signal, the indication, or both indicate that the first control block is allocated to the second UE.

[0158] In some examples, a first set of control resources in a first frequency band corresponding to a first UE group is different from a second set of control resources in a second frequency band corresponding to a second UE group. In some examples, a first control block of the first set of control resources precedes a second control block of the first set of control resources allocated to the first UE, and wherein the first control block is associated with a higher priority than the second control block based on the first control block of the first set of control resources preceding the second control block of the first set of control resources. In some examples, the first frequency band is higher in frequency than the second frequency band, and wherein the first UE group is associated with a higher priority than the second UE group based on the first frequency band being higher in frequency than the second frequency band.

[0159] The sidelink request component 1020 may transmit a sidelink request for reserving a set of data resources to a second UE in a first UE group on a transmit beam on a first control block of a first set of control resources, wherein the first control block is allocated to the first UE. In some examples, the sidelink request component 1020 may monitor on a receive beam on a first control block of a first set of control resources for a sidelink request for reserving a set of data resources from a second UE, wherein the first control block is allocated to the second UE, and the sidelink request indicates that the first UE is a target UE of the sidelink request. In some examples, the sidelink request component 1020 may monitor on a receive beam on a first set of control resources in a first frequency band for the first sidelink request from the second UE. In some examples, the sidelink request component 1020 may receive, based on the monitoring, a second sidelink request for reserving a set of data resources from a third UE, the second sidelink request indicating that a fourth UE is a target UE of the second sidelink request, wherein the second UE group includes the third UE and the fourth UE. In some examples, sidelink request component 1020 can transmit a second sidelink request to reserve a second set of data resources to a third UE in a second UE group on a transmit beam on a second control block of a second set of control resources, where the second control block is allocated to the first UE. In some examples, sidelink request component 1020 can monitor, by the first UE, on a second receive beam on a second set of control resources in a second frequency band for one or more sidelink requests from one or more UEs in a second UE group, where the second set of control resources corresponds to the second UE group.

[0160] In some examples, the sidelink request component 1020 can monitor on a receive beam on a second control block of a second set of control resources for a second sidelink request from a third UE to reserve a second set of data resources, wherein the second control block is allocated to the third UE and the second sidelink request indicates that the first UE is a target UE of the second sidelink request. In some examples, the sidelink request component 1020 can monitor on a second receive beam on a second set of control resources in a second frequency band by the first UE for one or more sidelink requests from each UE in a second UE group, the second set of control resources corresponding to the second UE group. In some examples, the sidelink request component 1020 can receive a second sidelink request for reserving a set of data resources from a third UE, wherein the first group or the second group includes the third UE.

[0161] In some examples, sidelink request component 1020 can monitor, by the first UE, on a second receive beam on a second set of control resources in a second frequency band for a sidelink request from each UE in a second UE group, the second set of control resources corresponding to the second UE group. In some examples, sidelink request component 1020 can determine, based on receiving the second sidelink request, that the first UE is not a target UE of the second sidelink request, wherein determining whether to send a sidelink response to the third UE is based on determining that the first UE is not a target UE. In some examples, sidelink request component 1020 can receive, from the second UE on a receive beam on a first set of control resources in the first frequency band, a first sidelink request for a set of reserved data resources.

[0162] The sidelink response component 1025 can monitor one or more sidelink responses on a receive beam on a first set of control resources by a first UE. In some examples, the sidelink response component 1025 can determine, based on the monitoring, whether to send a sidelink response to a second UE on a transmit beam on the first set of control resources, the sidelink response comprising a positive sidelink response to the sidelink request or a negative sidelink response to the sidelink request, the positive sidelink response indicating that the set of data resources is available and the negative sidelink response indicating that the set of data resources is not available. In some examples, the sidelink response component 1025 can determine, based on receiving a second sidelink request, whether to send a sidelink response to a third UE, the sidelink response indicating a positive response to the second sidelink request for reserving a set of data resources or a negative response to the second sidelink request for reserving a set of data resources.

[0163] In some examples, the sidelink response component 1025 may receive a positive sidelink response from the second UE in one or more sidelink responses based on monitoring. In some examples, the sidelink response component 1025 may receive a negative sidelink response from the third UE in one or more sidelink responses based on monitoring. In some examples, the sidelink response component 1025 may transmit a sidelink response to the second UE on a transmit beam on a first control block of a first control resource set based on determining whether to transmit a sidelink response. In some examples, the sidelink response component 1025 may transmit a positive sidelink response to the second UE or transmit a negative sidelink response to the second UE based on determining an interference level between a first transmission from the third UE and a second transmission from the second UE.

[0164] In some examples, the sidelink response component 1025 can refrain from sending a sidelink response to the third UE based on determining that the first UE is not the target UE. In some examples, the sidelink response component 1025 can send a second negative sidelink response to the second UE on a transmit beam on a first set of control resources in a first frequency band, wherein the determination of whether to send the sidelink response to the third UE is based on measured interference between a first transmission from the second UE and a second transmission from the third UE. In some examples, the sidelink response component 1025 can send a second positive sidelink response to the second UE on a transmit beam on a first set of control resources in the first frequency band, wherein the determination of whether to send the sidelink response to the third UE is based on measured interference between the first transmission from the second UE and the second transmission from the third UE. In some examples, the sidelink request is sent during a first portion of the first control block, the positive sidelink response is received during a second portion of the first control block, and the sidelink acknowledgment is sent during a third portion of the first control block.

[0165] Group assigning component 1030 may assign a set of UEs to a first UE group, the set of UEs including a first UE and a second UE. In some examples, group assigning component 1030 may assign each control block in a set of control blocks of a first set of control resources in a first frequency band to each UE in the set of UEs. In some examples, group assigning component 1030 may send a signal to the set of UEs indicating the set of control blocks, indicating that the set of UEs is assigned to the first UE group, or both. In some examples, group assigning component 1030 may assign the set of UEs to the first UE group, the set of UEs including the second UE and the first UE.

[0166] In some examples, group assigning component 1030 may assign each control block in a set of control blocks for a first set of control resources in a first frequency band to each UE in a set of UEs. In some examples, group assigning component 1030 may send a signal to the set of UEs indicating the set of control blocks, indicating that the set of UEs is assigned to the first UE group, or both. In some examples, group assigning component 1030 may assign the set of UEs to a first UE group, the set of UEs comprising the first UE and the second UE. In some examples, group assigning component 1030 may assign each control block in a set of control blocks for a first set of control resources in the first frequency band to the set of UEs. In some examples, group assigning component 1030 may send a signal to the set of UEs indicating the set of control blocks, indicating that the set of UEs is assigned to the first UE group, or both.

[0167] Message indicating component 1035 can send a signal to the base station indicating that the first UE has a message for transmission to the third UE.

[0168] The group resource component 1040 can receive an indication from the base station that the first UE is assigned to the second UE group in response to the signal, wherein determining the second set of control resources in the second frequency band is based on the indication.

[0169] The sidelink acknowledgement component 1045 can send a sidelink acknowledgement to the second UE on the first set of control resources in the first frequency band based on receiving a positive sidelink response from the second UE. In some examples, the sidelink acknowledgement component 1045 can refrain from sending a sidelink acknowledgement to the second UE on the first set of control resources in the first frequency band based on receiving a negative sidelink response. In some examples, the sidelink request is sent during a first portion of the first control block, the positive sidelink response is received during a second portion of the first control block, and the sidelink acknowledgement is sent during a third portion of the first control block.

[0170] The shared data component 1050 can transmit data to one or more UEs on the data resources concurrently with the UEs in the second UE group transmitting on the control resources in the first frequency band.

[0171] In some examples, the shared data component 1050 can transmit data to one or more UEs on the data resources concurrently with the UEs in the second UE group transmitting on the control resources in the first frequency band.

[0172] In some examples, the shared data component 1050 can transmit data to one or more UEs on the data resources concurrently with the UEs in the second UE group transmitting on the control resources in the second frequency band.

[0173] Interference component 1055 can determine an interference level between the first transmission from the third UE and the second transmission from the second UE based on receiving the second sidelink request.

[0174] Figure 11 A schematic diagram of a system 1100 including a device 1105 supporting control signaling techniques for sidelink communications according to aspects of the present disclosure is shown. The device 1105 can be an example of, or include components of, the device 805, device 905, or UE 115 as described herein. The device 1105 can include components for two-way voice and data communications, including components for sending and receiving communications, including a communications manager 1110, an I / O controller 1115, a transceiver 1120, an antenna 1125, a memory 1130, and a processor 1140. These components can communicate electronically via one or more buses (e.g., bus 1145).

[0175] The communication manager 1110 can perform the following operations: determine shared resources for communicating on one or more sidelink communication links, the shared resources including control resources and data resources; determine a first set of control resources in a first frequency band corresponding to a first UE group, the first UE group including a first UE; send a sidelink request for a set of reserved data resources to a second UE in the first UE group on a transmit beam on a first control block of the first control resource set, wherein the first control block is allocated to the first UE; and monitor, by the first UE, one or more sidelink responses on a receive beam on the first control resource set. The communication manager 1110 may also perform the following operations: determine shared resources for communicating on one or more sidelink communication links, the shared resources including control resources and data resources; determine a first set of control resources in a first frequency band corresponding to a first UE group, the first UE group including a first UE and a second UE; monitor a sidelink request for reserving a set of data resources from a second UE on a receive beam on a first control block of the first control resource set, the first control block being allocated to the second UE, and the sidelink request indicating that the first UE is a target UE of the sidelink request; and determine whether to send a sidelink response to the second UE on a transmit beam on the first control resource set based on the monitoring, the sidelink response including a positive sidelink response to the sidelink request or a negative sidelink response to the sidelink request, the positive sidelink response indicating that the set of data resources is available and the negative sidelink response indicating that the set of data resources is unavailable. The communication manager 1110 may also perform the following operations: determine shared resources for communicating on one or more sidelink communication links, the shared resources including control resources and data resources; determine a first set of control resources in a first frequency band corresponding to a first UE group, the first UE group including a first UE and a second UE; monitor a first sidelink request from a second UE on a receive beam on the first set of control resources in the first frequency band; receive a second sidelink request for a set of reserved data resources from a third UE based on the monitoring, the second sidelink request indicating that a fourth UE is a target UE of the second sidelink request, the second UE group including the third UE and the fourth UE; and determine whether to send a sidelink response to the third UE based on receiving the second sidelink request, the sidelink response indicating a positive response to the second sidelink request for a set of reserved data resources or a negative response to the second sidelink request for a set of reserved data resources.

[0176] I / O controller 1115 can manage input and output signals for device 1105. I / O controller 1115 can also manage peripheral devices that are not integrated into device 1105. In some examples, I / O controller 1115 can represent a physical connection or port to an external peripheral device. In some examples, I / O controller 1115 can utilize a computer such as , or another known operating system. In other cases, I / O controller 1115 may represent or interact with a modem, keyboard, mouse, touch screen, or similar device. In some examples, I / O controller 1115 may be implemented as part of a processor. In some examples, a user may interact with device 1105 via I / O controller 1115 or via hardware components controlled by I / O controller 1115.

[0177] The transceiver 1120 can communicate bidirectionally via one or more antennas, wired or wireless links as described above. For example, the transceiver 1120 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. The transceiver 1120 can also include a modem for modulating packets and providing the modulated packets to the antenna for transmission, and for demodulating packets received from the antenna.

[0178] In some examples, a wireless device may include a single antenna 1125. However, in some examples, the device may have more than one antenna 1125, which may be capable of sending or receiving multiple wireless transmissions simultaneously.

[0179] The memory 1130 may include random access memory (RAM) and read-only memory (ROM). The memory 1130 may store computer-readable, computer-executable code 1135, which includes instructions that, when executed, cause the processor to perform various functions described herein. In some examples, the memory 1130 may also contain, among other things, a basic input / output system (BIOS), which may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0180] The processor 1140 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, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some examples, the processor 1140 may be configured to operate a memory array using a memory controller. In other cases, the memory controller may be integrated into the processor 1140. The processor 1140 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1130) to cause the device 1105 to perform various functions (e.g., functions or tasks that support control signaling techniques for sidelink communications).

[0181] The code 1135 may include instructions for implementing various aspects of the present disclosure, including instructions for supporting wireless communications. The code 1135 may be stored in a non-transitory computer-readable medium (such as system memory or other types of memory). In some examples, the code 1135 may not be directly executable by the processor 1140, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0182] Figure 12 A block diagram of a device 1205 supporting control signaling techniques for sidelink communications according to aspects of the present disclosure is shown. The device 1205 can be an example of aspects of the base station 105 as described herein. The device 1205 may include a receiver 1210, a communication manager 1215, and a transmitter 1220. The communication manager 1215 may be implemented at least in part by one or both of a modem and a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0183] The receiver 1210 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 control signaling techniques for sidelink communications, among other examples). The information may be communicated to other components of the device 1205. The receiver 1210 may be a reference to Figure 15 Examples of various aspects of the transceiver 1520 are described. The receiver 1210 may utilize a single antenna or a group of antennas.

[0184] The communication manager 1215 may perform the following operations: determining shared resources for sidelink communication between at least a first UE and a second UE, the shared resources comprising control resources and data resources; assigning the first UE to a first UE group and assigning the second UE to a second UE group, wherein the first UE group is associated with a first set of control resources in a first frequency band and the second UE group is associated with a second set of control resources in a second frequency band; and sending an indication to at least one of the first UE or the second UE that the first UE is assigned to the first UE group, the second UE is assigned to the second UE group, or both. The communication manager 1215 may be an example of aspects of the communication manager 1510 described herein.

[0185] The communication manager 1215 or its subcomponents may be implemented in hardware, in code executed by a processor (e.g., software or firmware), or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 1215 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 this disclosure.

[0186] The communication manager 1215 or its subcomponents can be physically located at different locations, including being distributed so that portions 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 1215 or its subcomponents can be separate and distinct components. In some examples, according to various aspects of the present disclosure, the communication manager 1215 or its subcomponents can be combined with one or more other hardware components (including but not limited to input / output (I / O) components, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof).

[0187] The transmitter 1220 can transmit signals generated by other components of the device 1205. In some examples, the transmitter 1220 can be co-located with the receiver 1210 in a transceiver component. For example, the transmitter 1220 can be a reference Figure 15 Examples of aspects of the transceiver 1520 are described. The transmitter 1220 may utilize a single antenna or a group of antennas.

[0188] Figure 13A block diagram of a device 1305 supporting control signaling techniques for sidelink communications according to aspects of the present disclosure is shown. Device 1305 may be an example of aspects of device 1205 or base station 105 as described herein. Device 1305 may include a receiver 1310, a communication manager 1315, and a transmitter 1335. Communication manager 1315 may be implemented at least in part by one or both of a modem and a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0189] The receiver 1310 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 control signaling techniques for sidelink communications, among other examples). The information may be communicated to other components of the device 1305. The receiver 1310 may be a reference to Figure 15 Examples of various aspects of the transceiver 1520 are described. The receiver 1310 may utilize a single antenna or a group of antennas.

[0190] The communications manager 1315 may be an example of aspects of the communications manager 1215 as described herein. The communications manager 1315 may include a resource manager 1320, a delegation manager 1325, and an indication manager 1330. The communications manager 1315 may be an example of aspects of the communications manager 1510 as described herein.

[0191] The resource manager 1320 may determine shared resources for sidelink communication between at least the first UE and the second UE, the shared resources including control resources and data resources.

[0192] The assignment manager 1325 may assign a first UE to a first UE group and a second UE to a second UE group, wherein the first UE group is associated with a first set of control resources in a first frequency band and the second UE group is associated with a second set of control resources in a second frequency band.

[0193] The indication manager 1330 may send an indication to at least one of the first UE or the second UE that the first UE is assigned to the first UE group, or the second UE is assigned to the second UE group, or both.

[0194] The transmitter 1335 can transmit signals generated by other components of the device 1305. In some examples, the transmitter 1335 can be co-located with the receiver 1310 in a transceiver component. For example, the transmitter 1335 can be a reference Figure 15 Examples of various aspects of the transceiver 1520 are described. The transmitter 1335 can utilize a single antenna or a group of antennas.

[0195] Figure 14 A block diagram of a communications manager 1405 supporting control signaling techniques for sidelink communications in accordance with aspects of the present disclosure is shown. Communications manager 1405 may be an example of aspects of communications manager 1215, communications manager 1315, or communications manager 1510 described herein. Communications manager 1405 may include a resource manager 1410, an assignment manager 1415, an indication manager 1420, a priority manager 1425, and a location manager 1430. Each of these components may communicate with each other, directly or indirectly (e.g., via one or more buses).

[0196] The resource manager 1410 may determine shared resources for sidelink communication between at least a first UE and a second UE, the shared resources including control resources and data resources.

[0197] The assignment manager 1415 may assign a first UE to a first UE group and a second UE to a second UE group, wherein the first UE group is associated with a first set of control resources in a first frequency band and the second UE group is associated with a second set of control resources in a second frequency band.

[0198] In some examples, the assignment manager 1415 may assign the first UE to the first UE group based on one or more locations. In some examples, the assignment manager 1415 may allocate a first control block of a first control resource set to the first UE. In some examples, the assignment manager 1415 may assign a third UE to the first UE group.

[0199] In some examples, the assignment manager 1415 can assign the third UE to a second control block of the first set of control resources in the first frequency band based on determining that the first priority of the first UE is higher than the second priority of the third UE, wherein the second control block is after the first control block. In some examples, the first UE group includes a different number of UEs than the second UE group.

[0200] The indication manager 1420 may send an indication to at least one of the first UE or the second UE that the first UE is assigned to the first UE group, the second UE is assigned to the second UE group, or both. In some examples, the indication manager 1420 may send an indication to at least one UE in the first UE group that the first control block is allocated to the first UE.

[0201] Priority manager 1425 may determine a first priority associated with a first UE and a second priority associated with a second UE, wherein assigning the first UE to a first UE group and assigning the second UE to a second UE group is based on the first priority and the second priority. In some examples, priority manager 1425 may determine that the first priority of the first UE is higher than the second priority of the third UE. In some examples, the first priority is higher than the second priority, and the first frequency band includes a higher frequency than the second frequency band.

[0202] The location manager 1430 may determine one or more locations of one or more UEs.

[0203] Figure 15 A schematic diagram of a system 1500 including a device 1505 supporting control signaling techniques for sidelink communications according to aspects of the present disclosure is shown. Device 1505 can be an example of, or include components of, device 1205, device 1305, or base station 105 as described herein. Device 1505 can include components for two-way voice and data communications, including components for sending and receiving communications, including a communications manager 1510, a network communications manager 1515, a transceiver 1520, an antenna 1525, a memory 1530, a processor 1540, and an inter-station communications manager 1545. These components can communicate electronically via one or more buses (e.g., bus 1550).

[0204] The communication manager 1510 can perform the following operations: determine shared resources for sidelink communication between at least a first UE and a second UE, the shared resources including control resources and data resources; assign the first UE to a first UE group and assign the second UE to a second UE group, wherein the first UE group is associated with a first set of control resources in a first frequency band and the second UE group is associated with a second set of control resources in a second frequency band; and send an indication to at least one of the first UE or the second UE that the first UE is assigned to the first UE group, or the second UE is assigned to the second UE group, or both.

[0205] The network communications manager 1515 may manage communications with the core network (eg, via one or more wired backhaul links). For example, the network communications manager 1515 may manage the transmission of data communications for client devices, such as one or more UEs 115.

[0206] The transceiver 1520 can communicate bidirectionally via one or more antennas, wired or wireless links as described above. For example, the transceiver 1520 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. The transceiver 1520 can also include a modem for modulating packets and providing the modulated packets to the antenna for transmission, and for demodulating packets received from the antenna.

[0207] In some examples, a wireless device may include a single antenna 1525. However, in some examples, the device may have more than one antenna 1525, which may be capable of sending or receiving multiple wireless transmissions simultaneously.

[0208] Memory 1530 may include RAM, ROM, or a combination thereof. Memory 1530 may store computer-readable code 1535, which includes instructions that, when executed by a processor (e.g., processor 1540), cause the device to perform various functions described herein. In some examples, memory 1530 may also contain, among other things, a BIOS that may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0209] Processor 1540 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, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some examples, processor 1540 may be configured to operate a memory array using a memory controller. In some examples, the memory controller may be integrated into processor 1540. Processor 1540 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1530) to cause device 1505 to perform various functions (e.g., functions or tasks that support control signaling techniques for sidelink communications).

[0210] The inter-site communication manager 1545 can manage communications with other base stations 105 and can include a controller or scheduler for controlling communications with the UE 115 in cooperation with the other base stations 105. For example, the inter-site communication manager 1545 can coordinate the scheduling of transmissions to the UE 115 to implement various interference mitigation techniques such as beamforming or joint transmission. In some examples, the inter-site communication manager 1545 can provide an X2 interface within the LTE / LTE-A wireless communication network technology to provide communications between the base stations 105.

[0211] The code 1535 may include instructions for implementing various aspects of the present disclosure, including instructions for supporting wireless communications. The code 1535 may be stored in a non-transitory computer-readable medium (such as system memory or other types of memory). In some examples, the code 1535 may not be directly executable by the processor 1540, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0212] Figure 16 A flow chart illustrating a method 1600 for supporting control signaling techniques for sidelink communications according to aspects of the present disclosure is shown. The operations of the method 1600 may be implemented by the UE 115 or components thereof as described herein. For example, the operations of the method 1600 may be implemented by the UE 115 or components thereof as described herein. Figure 8-11 In some examples, the UE may execute an instruction set to control the functional units 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.

[0213] At 1605, the UE may determine shared resources for communicating on one or more sidelink communication links, the shared resources including control resources and data resources. 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 Figure 8-11 Described shared resource components to execute.

[0214] At 1610, the UE may determine a first set of control resources in a first frequency band corresponding to a first UE group, the first UE group including the first 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 as described with reference to Figure 8-11 Describes the group of components to execute.

[0215] At 1615, the UE may transmit a sidelink request for a set of reserved data resources to a second UE in the first UE group on a transmit beam on a first control block of a first set of control resources, wherein the first control block is allocated to 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 as described with reference to Figure 8-11 Described sidelink request component to perform.

[0216] At 1620, the UE may monitor one or more sidelink responses on a receive beam on a first set of control resources by a 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 Figure 8-11The sidelink response component described is used to perform.

[0217] Figure 17 A flow chart illustrating a method 1700 for supporting control signaling techniques for sidelink communications according to aspects of the present disclosure is shown. The operations of the method 1700 may be implemented by the UE 115 or components thereof as described herein. For example, the operations of the method 1700 may be implemented by the UE 115 or components thereof as described herein. Figure 8-11 In some examples, the UE may execute an instruction set to control the functional units 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.

[0218] At 1705, the UE may determine shared resources for communicating on one or more sidelink communication links, the shared resources including control resources and data resources. 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 Figure 8-11 Described shared resource components to execute.

[0219] At 1710, the UE may determine a first set of control resources in a first frequency band corresponding to a first UE group, the first UE group including a first UE and a second UE. 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 Figure 8-11 Describes the group of components to execute.

[0220] At 1715, the UE may monitor a first control block of a first set of control resources on a receive beam for a sidelink request from a second UE for a set of reserved data resources, the first control block being allocated to the second UE, and the sidelink request indicating that the first UE is a target UE of the sidelink request. 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 Figure 8-11 Described sidelink request component to perform.

[0221] At 1720, the UE may determine, based on monitoring, whether to transmit a sidelink response to the second UE on the transmit beam on the first set of control resources, the sidelink response comprising a positive sidelink response to the sidelink request or a negative sidelink response to the sidelink request, the positive sidelink response indicating that the set of data resources is available and the negative sidelink response indicating that the set of data resources is not available. The operations of 1720 may be performed according to the methods described herein. In some examples, aspects of the operations of 1720 may be performed as described with reference to Figure 8-11 The sidelink response component described is used to perform.

[0222] Figure 18 A flow chart illustrating a method 1800 for supporting control signaling techniques for sidelink communications according to aspects of the present disclosure is shown. The operations of the method 1800 may be implemented by the UE 115 or components thereof as described herein. For example, the operations of the method 1800 may be implemented by the UE 115 or components thereof as described herein. Figure 8-11 In some examples, the UE may execute an instruction set to control the functional units 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.

[0223] At 1805, the UE may determine shared resources for communicating on one or more sidelink communication links, the shared resources including control resources and data resources. The operations of 1805 may be performed according to the methods described herein. In some examples, aspects of the operations of 1805 may be as described with reference to Figure 8-11 Described shared resource components to execute.

[0224] At 1810, the UE may determine a first set of control resources in a first frequency band corresponding to a first UE group, the first UE group including a first UE and a second 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 Figure 8-11 Describes the group of components to execute.

[0225] At 1815, the UE may monitor a first sidelink request from a second UE on a receive beam on a first set of control resources in a first frequency band. The operations of 1815 may be performed according to the methods described herein. In some examples, aspects of the operations of 1815 may be as described with reference to Figure 8-11 Described sidelink request component to perform.

[0226] At 1820, the UE may receive, based on monitoring, a second sidelink request from a third UE for reserving a set of data resources, the second sidelink request indicating that a fourth UE is a target UE of the second sidelink request, the second UE group including the third UE and the fourth UE. The operations of 1820 may be performed according to the methods described herein. In some examples, aspects of the operations of 1820 may be as described with reference to Figure 8-11 Described sidelink request component to perform.

[0227] At 1825, the UE may determine whether to send a sidelink response to the third UE based on receiving the second sidelink request, the sidelink response indicating a positive response to the second sidelink request for reserving a set of data resources or a negative response to the second sidelink request for reserving a set of data resources. The operations of 1825 may be performed according to the methods described herein. In some examples, aspects of the operations of 1825 may be performed as described with reference to Figure 8-11 The sidelink response component described is used to perform.

[0228] Figure 19 A flow chart illustrating a method 1900 for supporting control signaling techniques for sidelink communications according to aspects of the present disclosure is shown. The operations of the method 1900 may be implemented by the base station 105 or components thereof as described herein. For example, the operations of the method 1900 may be implemented by the base station 105 or components thereof as described herein. Figure 12-15 In some examples, the base station may execute an instruction set to control the functional units 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.

[0229] At 1905, the base station may determine shared resources for sidelink communication between at least the first UE and the second UE, the shared resources including control resources and data resources. The operations of 1905 may be performed according to the methods described herein. In some examples, aspects of the operations of 1905 may be as described with reference to Figure 12-15 Describes the resource manager to execute.

[0230] At 1910, a base station may assign a first UE to a first UE group and a second UE to a second UE group, wherein the first UE group is associated with a first set of control resources in a first frequency band and the second UE group is associated with a second set of control resources in a second frequency band. 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 Figure 12-15 Described by the assignment manager to execute.

[0231] At 1915, the base station may send an indication to at least one of the first UE or the second UE that the first UE is assigned to the first UE group, the second UE is assigned to the second UE group, or both. 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 Figure 12-15 Describes the instructions the manager should perform.

[0232] It should be noted that the methods described herein describe possible implementations, and that the operations and steps may be rearranged or otherwise modified, and other implementations are possible. Furthermore, aspects from two or more methods may be combined.

[0233] The following provides a summary of various aspects of the present disclosure:

[0234] Aspect 1: A method for wireless communication at a first UE, comprising: determining shared resources for communicating on one or more sidelink communication links, the shared resources including control resources and data resources; determining a first set of control resources in a first frequency band corresponding to a first UE group, the first UE group including the first UE; sending a sidelink request for reserving the set of data resources to a second UE in the first UE group on a transmit beam on a first control block of the first control resource set, wherein the first control block is allocated to the first UE; and monitoring, by the first UE, one or more sidelink responses on a receive beam on the first control resource set.

[0235] Aspect 2: The method according to Aspect 1 further includes: receiving an indication from a base station that the first UE is assigned to the first UE group, wherein determining the first control resource set in the first frequency band is at least partially based on the indication; and determining that the first control block is allocated to the first UE at least partially based on the indication.

[0236] Aspect 3: The method according to Aspect 1 further includes: assigning multiple UEs to the first UE group, the multiple UEs including the first UE and the second UE; allocating each of the multiple control blocks of the first control resource set in the first frequency band to a corresponding UE among the multiple UEs; and sending an indication of the multiple control blocks to the multiple UEs, an indication that the multiple UEs are assigned to the first UE group, or both.

[0237] Aspect 4: The method according to Aspect 1 further includes: receiving an indication from a UE that the first UE is assigned to the first UE group, wherein determining the first control resource set is at least partially based on the indication; and determining that the first control block is allocated to the first UE at least partially based on the indication.

[0238] Aspect 5: The method according to aspect 4, wherein the indication indicates that the first control block is allocated to the first UE.

[0239] Aspect 6: The method according to any one of Aspects 1 to 5 further includes: sending a signal to a base station, the signal indicating that the first UE has a message for transmission to a third UE; receiving an indication from the base station that the first UE is assigned to a second UE group in response to the signal; determining a second control resource set in a second frequency band corresponding to the second UE group based at least in part on the indication, wherein the second UE group includes the first UE; and sending a second sidelink request for reserving a second data resource set to a third UE in the second UE group on a transmit beam on a second control block of the second control resource set, wherein the second control block is allocated to the first UE.

[0240] Aspect 7: A method according to any one of Aspects 1 to 6, wherein the second UE group is associated with a higher priority than the first UE group, and wherein, at least in part based on the second UE group being associated with a higher priority than the first UE group, the second frequency band corresponding to the second UE group is higher in frequency than the first frequency band.

[0241] Aspect 8: A method according to any one of Aspects 1 to 7, wherein the first control block of the first control resource set is associated with a higher priority than the second control block of the first control resource set allocated to the second UE, and wherein, at least in part based on the first control block being associated with a higher priority than the second control block, the first control block precedes the second control block.

[0242] Aspect 9: A method according to any one of Aspects 1 to 8, wherein both the first UE group and the second UE group include the first UE, and the method further includes: the first UE monitoring one or more sidelink requests from one or more UEs in the second UE group on a second receiving beam on a second control resource set in a second frequency band, and the second control resource set corresponds to the second UE group.

[0243] Aspect 10: The method according to Aspect 1 further includes: receiving a positive sidelink response from the one or more sidelink responses from the second UE at least in part based on the monitoring; and sending a sidelink confirmation to the second UE on a first set of control resources in the first frequency band based at least in part on receiving the positive sidelink response from the second UE, wherein the sidelink request is sent during a first part of the first control block, the positive sidelink response is received during a second part of the first control block, and the sidelink confirmation is sent during a third part of the first control block.

[0244] Aspect 11: The method according to Aspect 1 further includes: receiving a negative sidelink response from the one or more sidelink responses from a third UE at least in part based on the monitoring; and avoiding sending a sidelink confirmation to the second UE on the first control resource set in the first frequency band at least in part based on receiving the negative sidelink response.

[0245] Aspect 12: The method according to Aspect 1, wherein the first UE group includes a different number of UEs compared to the second UE group, and the method further includes: sending data to one or more UEs on the data resources concurrently with the UEs of the second UE group sending on the control resources in the first frequency band.

[0246] Aspect 13: A method for wireless communication at a first UE, comprising: determining shared resources for communicating on one or more sidelink communication links, the shared resources comprising control resources and data resources; determining a first set of control resources in a first frequency band corresponding to a first UE group, the first UE group comprising the first UE and a second UE; monitoring on a receive beam on a first control block of the first set of control resources for a sidelink request from the second UE for reserving the set of data resources, the first control block being allocated to the second UE, and the sidelink request indicating that the first UE is a target UE of the sidelink request; and determining, at least in part based on the monitoring, whether to send a sidelink response to the second UE on a transmit beam on the first set of control resources, the sidelink response comprising a positive sidelink response to the sidelink request or a negative sidelink response to the sidelink request, the positive sidelink response indicating that the set of data resources is available, and the negative sidelink response indicating that the set of data resources is unavailable.

[0247] Aspect 14: The method according to Aspect 13 further includes: receiving an indication from a base station that the first UE is assigned to the first UE group, wherein determining the first control resource set in the first frequency band is at least partially based on the indication; and determining that the first control block is allocated to the second UE based at least partially on the indication.

[0248] Aspect 15: The method according to Aspect 13 further includes: assigning multiple UEs to the first UE group, the multiple UEs including the second UE and the first UE; allocating each of the multiple control blocks of the first control resource set in the first frequency band to a corresponding UE among the multiple UEs; and sending an indication of the multiple control blocks to the multiple UEs, an indication that the multiple UEs are assigned to the first UE group, or both.

[0249] Aspect 16: The method according to Aspect 13 further includes: receiving an indication from a UE that the first UE is assigned to the first UE group, wherein determining the first control resource set is at least partially based on the indication; and determining that the first control block is allocated to the first UE at least partially based on the indication.

[0250] Aspect 17: The method according to aspect 16, wherein the indication indicates that the first control block is allocated to the second UE.

[0251] Aspect 18: The method according to any one of Aspects 13 to 17 further includes: receiving an indication from a base station that the first UE is assigned to a second UE group; determining a second set of control resources in a second frequency band corresponding to the second UE group based at least in part on the indication, wherein the second UE group includes the first UE and a third UE; and monitoring a second sidelink request for reserving a second set of data resources from the third UE on a second control block of the second control resource set on a receiving beam, wherein the second control block is allocated to the third UE and the second sidelink request indicates that the first UE is the target UE of the second sidelink request.

[0252] Aspect 19: The method according to any one of aspects 13 to 18, wherein the first set of control resources in the first frequency band corresponding to the first UE group is different from the second set of control resources in the second frequency band corresponding to the second UE group.

[0253] Aspect 20: A method according to any one of Aspects 13 to 19, wherein the first control block of the first control resource set is associated with a higher priority than the second control block of the first control resource set allocated to the second UE, and wherein, at least in part based on the first control block being associated with a higher priority than the second control block, the first control block precedes the second control block.

[0254] Aspect 21: A method according to any one of Aspects 13 to 20, wherein both the first UE group and the second UE group include the first UE, and the method further includes: the first UE monitoring one or more sidelink requests from each UE in the second UE group on a second receiving beam on a second control resource set in a second frequency band, and the second control resource set corresponds to the second UE group.

[0255] Aspect 22: The method according to Aspect 13 also includes: sending the sidelink response to the second UE on the transmit beam on the first control block of the first control resource set based at least in part on determining whether to send the sidelink response, wherein the sidelink request is sent during the first part of the first control block, the positive sidelink response is received during the second part of the first control block, and the sidelink confirmation is sent during the third part of the first control block.

[0256] Aspect 23: The method according to Aspect 13 further includes: receiving a second sidelink request from a third UE for reserving the set of data resources, wherein the first group or the second group includes the third UE; determining an interference level between the first transmission from the third UE and the second transmission from the second UE based at least in part on receiving the second sidelink request; and sending the positive sidelink response to the second UE or sending the negative sidelink response to the second UE based at least in part on determining the interference level between the first transmission from the third UE and the second transmission from the second UE.

[0257] Aspect 24: A method according to Aspect 13, wherein the first UE group includes a different number of UEs compared to the second UE group, and the method further includes: sending data to one or more UEs on the data resources concurrently with the UEs in the second UE group sending on the control resources in the first frequency band.

[0258] Aspect 25: A method for wireless communication at a first UE, comprising: determining shared resources for communicating on one or more sidelink communication links, the shared resources comprising control resources and data resources; determining a first set of control resources in a first frequency band corresponding to a first UE group, the first UE group comprising the first UE and a second UE; monitoring a first sidelink request from the second UE on a receive beam on the first set of control resources in the first frequency band; receiving a second sidelink request for reserving the set of data resources from a third UE based at least in part on the monitoring, the second sidelink request indicating that a fourth UE is a target UE of the second sidelink request, the second UE group comprising the third UE and the fourth UE; and determining whether to send a sidelink response to the third UE based at least in part on receiving the second sidelink request, the sidelink response indicating a positive response to the second sidelink request for reserving the set of data resources or a negative response to the second sidelink request for reserving the set of data resources.

[0259] Aspect 26: The method according to aspect 25 further includes: receiving an indication from a base station that the first UE is assigned to the first UE group, wherein determining the first set of control resources in the first frequency band is at least partially based on the indication.

[0260] Aspect 27: The method according to Aspect 25 further includes: assigning multiple UEs to the first UE group, the multiple UEs including the first UE and the second UE; allocating each of the multiple control blocks of the first control resource set in the first frequency band to multiple UEs; and sending an indication of the multiple control blocks to the multiple UEs, an indication that the multiple UEs are assigned to the first UE group, or both.

[0261] Aspect 28: The method according to Aspect 25 further includes: receiving an indication from a UE that the first UE is assigned to the first UE group, wherein determining the first control resource set is at least partially based on the indication; and determining that the first control block is allocated to the first UE at least partially based on the indication.

[0262] Aspect 29: A method according to any one of Aspects 25 to 28, wherein the first frequency band is higher in frequency than the second frequency band, and at least in part based on the first frequency band being higher in frequency than the second frequency band, the first UE group is associated with a higher priority than the second UE group.

[0263] Aspect 30: A method according to Aspect 25, wherein both the second UE group and the first UE group include the first UE, and the method further includes: the first UE monitoring a sidelink request from each UE in the second UE group on a second receive beam on a second control resource set in a second frequency band, and the second control resource set corresponds to the second UE group.

[0264] Aspect 31: The method according to Aspect 25 further includes: determining that the first UE is not the target UE of the second sidelink request based at least in part on receiving the second sidelink request, wherein determining whether to send the sidelink response to the third UE is based at least in part on determining that the first UE is not the target UE; and avoiding sending the sidelink response to the third UE based at least in part on determining that the first UE is not the target UE.

[0265] Aspect 32: The method according to Aspect 25 further includes: receiving the first sidelink request for reserving the set of data resources from the second UE on the receive beam on the first control resource set in the first frequency band; and sending a second negative sidelink response to the second UE on the transmit beam on the first control resource set in the first frequency band, wherein determining whether to send the sidelink response to the third UE is at least partially based on measured interference between the first transmission from the second UE and the second transmission from the third UE.

[0266] Aspect 33: The method according to Aspect 25 further includes: receiving the first sidelink request for reserving the set of data resources from the second UE on the receive beam on the first control resource set in the first frequency band; and sending a second positive sidelink response to the second UE on the transmit beam on the first control resource set in the first frequency band, wherein determining whether to send the sidelink response to the third UE is at least partially based on measured interference between the first transmission from the second UE and the second transmission from the third UE.

[0267] Aspect 34: A method according to Aspect 25, wherein the second UE group includes a different number of UEs compared to the first UE group, and the method further includes: sending data to one or more UEs on the data resources concurrently with the UEs in the second UE group sending on the control resources in the second frequency band.

[0268] Aspect 35: A method for wireless communication at a base station, comprising: determining shared resources for sidelink communication between at least a first UE and a second UE, the shared resources comprising control resources and data resources; assigning the first UE to a first UE group and assigning the second UE to a second UE group, wherein the first UE group is associated with the first set of control resources in a first frequency band and the second UE group is associated with the second set of control resources in a second frequency band; and sending an indication to at least one of the first UE or the second UE that the first UE is assigned to the first UE group, or the second UE is assigned to the second UE group, or both.

[0269] Aspect 36: The method according to Aspect 35 also includes: determining a first priority associated with the first UE and a second priority associated with the second UE, wherein assigning the first UE to the first UE group and assigning the second UE to the second UE group is at least partially based on the first priority and the second priority.

[0270] Aspect 37: The method according to aspect 36, wherein the first priority is higher than the second priority, and the first frequency band includes a higher frequency than the second frequency band.

[0271] Aspect 38: The method according to any one of aspects 35 to 37 further includes: determining one or more locations of one or more UEs; and assigning the first UE to the first UE group based on the one or more locations.

[0272] Aspect 39: The method according to any one of Aspects 35 to 38 further includes: allocating a first control block of the first control resource set to the first UE; and sending an indication to at least one UE in the first UE group that the first control block is allocated to the first UE.

[0273] Aspect 40: The method according to Aspect 39 further includes: assigning a third UE to the first UE group; determining that the first priority of the first UE is higher than the second priority of the third UE; and allocating the third UE to the second control block of the first control resource set in the first frequency band based at least in part on determining that the first priority of the first UE is higher than the second priority of the third UE, wherein the second control block is after the first control block.

[0274] Aspect 41: The method according to any one of aspects 35 to 40, wherein the first UE group includes a different number of UEs than the second UE group.

[0275] Aspect 42: An apparatus for wireless communication at a first UE, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method according to any one of aspects 1 to 12.

[0276] Aspect 43: An apparatus for wireless communication at a first UE, comprising at least one unit for performing the method according to any one of aspects 1 to 12.

[0277] Aspect 44: A non-transitory computer-readable medium storing code for wireless communication at a first UE, the code comprising instructions executable by a processor to perform the method according to any one of aspects 1 to 12.

[0278] Aspect 45: An apparatus for wireless communication at a first UE, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method according to any one of aspects 13 to 24.

[0279] Aspect 46: An apparatus for wireless communication at a first UE, comprising at least one means for performing the method according to any one of aspects 13 to 24.

[0280] Aspect 47: A non-transitory computer-readable medium storing code for wireless communication at a first UE, the code comprising instructions executable by a processor to perform the method according to any one of aspects 13 to 24.

[0281] Aspect 48: An apparatus for wireless communication at a first UE, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method according to any one of aspects 25 to 34.

[0282] Aspect 49: An apparatus for wireless communication at a first UE, comprising at least one means for performing the method according to any one of aspects 25 to 34.

[0283] Aspect 50: A non-transitory computer-readable medium storing code for wireless communication at a first UE, the code comprising instructions executable by a processor to perform the method according to any one of aspects 25 to 34.

[0284] Aspect 51: An apparatus for wireless communication at a base station, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method according to any one of aspects 35 to 41.

[0285] Aspect 52: An apparatus for wireless communication at a base station, comprising at least one means for performing the method according to any one of aspects 35 to 41.

[0286] Aspect 53: A non-transitory computer-readable medium storing code for wireless communication at a base station, the code comprising instructions executable by a processor to perform the method according to any one of aspects 35 to 41.

[0287] Although aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for example purposes, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used throughout much of the description, the techniques described herein are 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.

[0288] The information and signals described herein may be represented using any of a variety of different techniques and methods. For example, data, instructions, commands, information, signals, bits, symbols, and chips mentioned throughout the description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0289] The various illustrative blocks and components described in conjunction with the disclosure herein may be implemented or executed using a general purpose processor, a DSP, an ASIC, a CPU, 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 herein. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any processor, controller, microcontroller, or state machine. A 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).

[0290] The functions described herein may be implemented using hardware, software executed by a processor, firmware, or any combination thereof. If implemented using software executed by a processor, the functions may be stored on or transmitted via a computer-readable medium as one or more instructions or codes. Other examples and implementations are within the scope of this disclosure and the appended claims. For example, due to the nature of software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or a combination of any of these. Features that implement the functions may also be physically located at different locations, including being distributed so that portions of the functions are implemented at different physical locations.

[0291] Computer readable medium includes non-transient 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-transient 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-transient computer readable medium can include RAM, 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 any other non-transient medium that can be accessed by general-purpose or special-purpose computer or general or special-purpose processor in the form of instruction or data structure.In addition, any connection is suitably referred to as computer readable medium.For example, if software is to be sent from website, server or other remote source using coaxial cable, optical fiber cable, twisted pair, digital subscriber line (DSL) or wireless technology such as infrared, radio and microwave, 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, wherein 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.

[0292] 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 (in other words, A and B and C). Furthermore, 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" could be based on both condition A and condition B without departing from the scope of this 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."

[0293] In the accompanying drawings, similar components or features may have the same reference number. In addition, various components of the same type may be distinguished by following the reference number with a dash and a second reference number to distinguish between similar components. If only the first reference number is used in the specification, the description applies to any one of the similar components having the same first reference number, regardless of the second reference number or other subsequent reference numbers.

[0294] The descriptions set forth herein in conjunction with the accompanying drawings describe example configurations and do not represent all examples that can be implemented or within the scope of the claims. The term "example" as used herein means "serving as an example, instance, or illustration," rather than "preferred" or "having advantages over other examples." The detailed description includes specific details for the purpose of providing an understanding of the described techniques. However, these techniques can be implemented 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.

[0295] 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 overall 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 intended to be used in the broadest sense consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication at a first user equipment (UE), comprising: determining shared resources for communicating over one or more sidelink communication links, the shared resources comprising control resources and data resources; Determining a first set of control resources in a first frequency band corresponding to a first UE group, the first UE group including the first UE; transmitting a sidelink request to reserve the set of data resources to a second UE in the first UE group on a transmit beam over a first control block of the first set of control resources, wherein the first control block is allocated to the first UE, wherein the first control block is associated with a higher priority than a second control block of the first set of control resources allocated to the second UE, and wherein the first control block precedes the second control block based at least in part on the first control block being associated with the higher priority than the second control block; and The first UE monitors one or more sidelink responses on a receive beam on the first set of control resources.

2. The method according to claim 1, further comprising: receiving an indication from a base station that the first UE is assigned to the first UE group, wherein determining the first set of control resources in the first frequency band is based at least in part on the indication; and A determination is made based at least in part on the indication that the first control block is allocated to the first UE.

3. The method according to claim 1, further comprising: assigning a plurality of UEs to the first UE group, the plurality of UEs including the first UE and the second UE; allocating each of the plurality of control blocks of the first set of control resources in the first frequency band to a corresponding UE among the plurality of UEs; as well as An indication of the plurality of control blocks, an indication that the plurality of UEs are assigned to the first UE group, or both, is sent to the plurality of UEs.

4. The method according to claim 1, further comprising: receiving an indication from a UE that the first UE is assigned to the first UE group, wherein determining the first set of control resources is based at least in part on the indication; and A determination is made based at least in part on the indication that the first control block is allocated to the first UE.

5. The method according to claim 4, wherein The indication indicates that the first control block is allocated to the first UE.

6. The method according to claim 1, wherein The second UE group is associated with a higher priority than the first UE group, and Wherein, based at least in part on the second UE group being associated with a higher priority than the first UE group, a second frequency band corresponding to the second UE group is higher in frequency than the first frequency band.

7. The method according to claim 1, wherein Both the first UE group and the second UE group include the first UE, and the method also includes: the first UE monitoring one or more side link requests from one or more UEs in the second UE group on a second receiving beam on a second control resource set in a second frequency band, and the second control resource set corresponds to the second UE group.

8. The method according to claim 1, further comprising: receiving, based at least in part on the monitoring, a negative sidelink response from a third UE of the one or more sidelink responses; as well as Refraining from sending a sidelink acknowledgement to the second UE on the first set of control resources in the first frequency band based at least in part on receiving the negative sidelink response.

9. The method according to claim 1, wherein: The first UE group includes a different number of UEs than the second UE group, and the method further includes: Data is sent to one or more UEs on the data resources concurrently with UEs in the second UE group sending on the control resources in the first frequency band.

10. A method for wireless communication at a first user equipment (UE), comprising: determining shared resources for communicating over one or more sidelink communication links, the shared resources comprising control resources and data resources; Determining a first set of control resources in a first frequency band corresponding to a first UE group, the first UE group including the first UE; sending, on a transmit beam over a first control block of the first set of control resources to a second UE in the first UE group, a sidelink request to reserve the set of data resources, wherein the first control block is allocated to the first UE; monitoring, by the first UE, on a receive beam on the first set of control resources, one or more sidelink responses; sending a signal to a base station, the signal indicating that the first UE has a message for transmission to a third UE; receiving an indication from the base station that the first UE is assigned to a second UE group in response to the signal; determining, based at least in part on the indication, a second set of control resources in a second frequency band corresponding to the second UE group, wherein the second UE group includes the first UE and the third UE; and A second sidelink request for reserving a second set of data resources is transmitted to the third UE on the transmit beam on a control block of the second set of control resources, wherein the control block is allocated to the first UE.

11. A method for wireless communication at a first user equipment (UE), comprising: determining shared resources for communicating over one or more sidelink communication links, the shared resources comprising control resources and data resources; Determining a first set of control resources in a first frequency band corresponding to a first UE group, the first UE group including the first UE; sending, on a transmit beam over a first control block of the first set of control resources to a second UE in the first UE group, a sidelink request to reserve the set of data resources, wherein the first control block is allocated to the first UE; monitoring, by the first UE, on a receive beam on the first set of control resources, one or more sidelink responses; receiving, based at least in part on the monitoring, a positive sidelink response from the second UE of the one or more sidelink responses; and sending a sidelink acknowledgment to the second UE on the first set of control resources in the first frequency band based at least in part on receiving the positive sidelink response from the second UE, wherein the sidelink request is sent during a first part of the first control block, the positive sidelink response is received during a second part of the first control block, and the sidelink acknowledgment is sent during a third part of the first control block.

12. A method for wireless communication at a first user equipment (UE), comprising: determining shared resources for communicating over one or more sidelink communication links, the shared resources comprising control resources and data resources; Determining a first set of control resources in a first frequency band corresponding to a first UE group, the first UE group including the first UE and a second UE; monitoring, on a receive beam, on a first control block of the first set of control resources, for a sidelink request from a second UE to reserve the set of data resources, the first control block being allocated to the second UE, and the sidelink request indicating that the first UE is a target UE of the sidelink request, wherein the first control block is associated with a higher priority than a second control block of the first set of control resources allocated to the first UE, and wherein the first control block precedes the second control block based at least in part on the first control block being associated with the higher priority than the second control block; and Determining whether to send a sidelink response to the second UE on a transmit beam on the first set of control resources based at least in part on the monitoring, the sidelink response comprising an affirmative sidelink response to the sidelink request or a negative sidelink response to the sidelink request, the affirmative sidelink response indicating that the set of data resources is available and the negative sidelink response indicating that the set of data resources is unavailable.

13. The method according to claim 12, further comprising: receiving an indication from a base station that the first UE is assigned to the first UE group, wherein determining the first set of control resources in the first frequency band is based at least in part on the indication; and A determination is made based at least in part on the indication that the first control block is allocated to the second UE.

14. The method according to claim 12, further comprising: assigning a plurality of UEs to the first UE group, the plurality of UEs including the second UE and the first UE; allocating each of the plurality of control blocks of the first set of control resources in the first frequency band to a corresponding UE among the plurality of UEs; as well as An indication of the plurality of control blocks, an indication that the plurality of UEs are assigned to the first UE group, or both, is sent to the plurality of UEs.

15. The method according to claim 12, further comprising: receiving an indication from a UE that the first UE is assigned to the first UE group, wherein determining the first set of control resources is based at least in part on the indication; and A determination is made based at least in part on the indication that the second control block is allocated to the first UE.

16. The method according to claim 15, wherein The indication indicates that the first control block is allocated to the second UE.

17. The method according to claim 12, further comprising: receiving an indication from a base station that the first UE is assigned to a second UE group; determining a second set of control resources in a second frequency band corresponding to the second UE group based at least in part on the indication, wherein the second UE group includes the first UE and a third UE; and Monitoring a second sidelink request for reserving a second set of data resources from the third UE on a control block of the second set of control resources on a receive beam, wherein the control block is allocated to the third UE and the second sidelink request indicates that the first UE is a target UE of the second sidelink request.

18. The method according to claim 12, wherein: The first set of control resources in the first frequency band corresponding to the first UE group is different from the second set of control resources in the second frequency band corresponding to the second UE group.

19. The method according to claim 12, wherein: Both the first UE group and the second UE group include the first UE, and the method also includes: the first UE monitoring one or more sidelink requests from each UE in the second UE group on a second receiving beam on a second control resource set in a second frequency band, and the second control resource set corresponds to the second UE group.

20. The method of claim 12, further comprising: and sending the sidelink response to the second UE on the transmit beam on the first control block of the first set of control resources based at least in part on determining whether to send the sidelink response, wherein the sidelink request is sent during a first part of the first control block, the positive sidelink response is received during a second part of the first control block, and the sidelink confirmation is sent during a third part of the first control block.

21. The method according to claim 12, further comprising: receiving a second sidelink request to reserve the set of data resources from a third UE, wherein the first UE group or the second UE group includes the third UE; determining an interference level between a first transmission from the third UE and a second transmission from the second UE based at least in part on receiving the second sidelink request; and The affirmative sidelink response is sent to the second UE or the negative sidelink response is sent to the second UE based at least in part on determining the interference level between the first transmission from the third UE and the second transmission from the second UE.

22. The method according to claim 12, wherein The first UE group includes a different number of UEs than the second UE group, and the method further includes sending data to one or more UEs on the data resources concurrently with the UEs in the second UE group transmitting on the control resources in the first frequency band.

23. An apparatus for wireless communication at a first user equipment (UE), comprising: processor, a memory coupled to the processor; as well as Instructions stored in the memory and executable by the processor to cause the device to perform the following operations: determining shared resources for communicating over one or more sidelink communication links, the shared resources comprising control resources and data resources; Determining a first set of control resources in a first frequency band corresponding to a first UE group, the first UE group including the first UE; transmitting a sidelink request to reserve the set of data resources to a second UE in the first UE group on a transmit beam over a first control block of the first set of control resources, wherein the first control block is allocated to the first UE, wherein the first control block is associated with a higher priority than a second control block of the first set of control resources allocated to the second UE, and wherein the first control block precedes the second control block based at least in part on the first control block being associated with the higher priority than the second control block; and The first UE monitors one or more sidelink responses on a receive beam on the first set of control resources.

24. The device according to claim 23, wherein The instructions are also executable by the processor to cause the device to perform the following operations: receiving an indication from a base station that the first UE is assigned to the first UE group, wherein determining the first set of control resources in the first frequency band is based at least in part on the indication; and A determination is made based at least in part on the indication that the first control block is allocated to the first UE.

25. The apparatus according to claim 23, wherein The instructions are also executable by the processor to cause the device to perform the following operations: assigning a plurality of UEs to the first UE group, the plurality of UEs including the first UE and the second UE; allocating each of the plurality of control blocks of the first set of control resources in the first frequency band to a corresponding UE among the plurality of UEs; as well as An indication of the plurality of control blocks, an indication that the plurality of UEs are assigned to the first UE group, or both, is sent to the plurality of UEs.

26. An apparatus for wireless communication at a first user equipment (UE), comprising: processor, a memory coupled to the processor; as well as Instructions stored in the memory and executable by the processor to cause the device to perform the following operations: determining shared resources for communicating over one or more sidelink communication links, the shared resources comprising control resources and data resources; Determining a first set of control resources in a first frequency band corresponding to a first UE group, the first UE group including the first UE and a second UE; monitoring, on a receive beam, on a first control block of the first set of control resources, for a sidelink request from a second UE to reserve the set of data resources, the first control block being allocated to the second UE, and the sidelink request indicating that the first UE is a target UE of the sidelink request, wherein the first control block is associated with a higher priority than a second control block of the first set of control resources allocated to the first UE, and wherein the first control block precedes the second control block based at least in part on the first control block being associated with the higher priority than the second control block; and Determining whether to send a sidelink response to the second UE on a transmit beam on the first set of control resources based at least in part on the monitoring, the sidelink response comprising an affirmative sidelink response to the sidelink request or a negative sidelink response to the sidelink request, the affirmative sidelink response indicating that the set of data resources is available and the negative sidelink response indicating that the set of data resources is unavailable.

27. The device according to claim 26, wherein The instructions are also executable by the processor to cause the device to perform the following operations: receiving an indication from a base station that the first UE is assigned to the first UE group, wherein determining the first set of control resources in the first frequency band is based at least in part on the indication; and A determination is made based at least in part on the indication that the first control block is allocated to the second UE.

28. The apparatus according to claim 26, wherein The instructions are also executable by the processor to cause the device to perform the following operations: assigning a plurality of UEs to the first UE group, the plurality of UEs including the second UE and the first UE; allocating each of the plurality of control blocks of the first set of control resources in the first frequency band to a corresponding UE among the plurality of UEs; as well as An indication of the plurality of control blocks, an indication that the plurality of UEs are assigned to the first UE group, or both, is sent to the plurality of UEs.

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