Transmit power adjustment based on inter-user equipment coordination

Abstract

Methods, systems, and devices for wireless communication are described. In one aspect, a first user equipment (UE) may send to a second UE an indication of non-preferred resources and an indication of an amount of transmit power reduction for sidelink transmissions on the non-preferred resources that the second UE needs to comply with. In another aspect, a first UE may send an indication of an amount of transmit power reduction for sidelink transmissions on conflicting resources (e.g., resources reserved by the second UE and a third UE) that a second UE needs to comply with. Because the second UE may transmit on the non-preferred resources or the conflicting resources at reduced power (e.g., rather than suppressing transmission on the non-preferred resources or the conflicting resources), utilization of the non-preferred resources or the conflicting resources may be increased.

Description

Cross-references

[0001] This patent application claims priority to U.S. patent application No. 17 / 886,166, filed by Ryu et al. on August 11, 2022, entitled “TRANSMIT POWERADJUSTMENT BASED ON INTER-USER EQUIPMENT COORDINATION,” which is assigned to the assignee of this application and is expressly incorporated herein by reference. Technical Field

[0002] The following relates to wireless communications, including transmit power adjustment based on coordination between user equipments. Background Art

[0003] 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 techniques such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal FDMA (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM).

[0004] A wireless multiple access communication system may include one or more network entities, each of which supports wireless communication of communication devices, which may be referred to as user equipment (UE). Some wireless communication systems may support sidelink communications between UEs. In such systems, it may be appropriate for the UEs to support inter-UE coordination (IUC) to coordinate communications on sidelink resources (e.g., to avoid interference and conflicts). Improved techniques for IUC may be needed. Summary of the invention

[0005] The described technology relates to improved methods, systems, devices, and apparatuses that support transmit power adjustment based on inter-user equipment (UE) coordination (IUC). In one aspect, when a first UE identifies non-preferred resources for sidelink transmissions from a second UE, the first UE may send an indication of the non-preferred resources to the second UE and an indication of an amount of transmit power reduction for sidelink transmissions on the non-preferred resources that the second UE needs to comply with. On the other hand, when the first UE identifies conflicting resources reserved by the second UE and a third UE, the first UE may send an indication of an amount of transmit power reduction for sidelink transmissions on these conflicting resources that the second UE needs to comply with. Because the second UE can transmit on these non-preferred resources or these conflicting resources at a reduced power (e.g., instead of suppressing transmission on these non-preferred resources or these conflicting resources), utilization of these non-preferred resources or these conflicting resources can be improved.

[0006] A method for wireless communication at a first UE is described. The method may include: receiving, by the first UE, first sidelink control information reserving a first set of resources for a first sidelink transmission by a third UE; sending an inter-UE coordination message to a second UE, the inter-UE coordination message indicating a second set of resources and a transmit power reduction amount that the second UE needs to comply with for a second sidelink transmission by the second UE via the second set of resources, wherein the second set of resources overlaps with the first set of resources; and receiving a second sidelink transmission from the second UE via the second set of resources or receiving a first sidelink transmission from the third UE via the first set of resources according to the indicated transmit power reduction amount.

[0007] An apparatus for wireless communication is described. The apparatus may include: a memory; a transceiver; and at least one processor of a first UE, the at least one processor being coupled to the memory and the transceiver. The at least one processor may be configured to: receive, by the first UE, first sidelink control information reserving a first set of resources for a first sidelink transmission by a third UE; send an inter-UE coordination message to a second UE, the inter-UE coordination message indicating a second set of resources and a transmit power reduction amount that the second UE needs to comply with for a second sidelink transmission by the second UE via the second set of resources, wherein the second set of resources overlaps with the first set of resources; and receive a second sidelink transmission from the second UE via the second set of resources according to the indicated transmit power reduction amount, or receive a first sidelink transmission from the third UE via the first set of resources.

[0008] Another apparatus for wireless communication at a first UE is described. The apparatus may include: a component for receiving, by the first UE, first sidelink control information reserving a first set of resources for a first sidelink transmission by a third UE; a component for sending an inter-UE coordination message to a second UE, the inter-UE coordination message indicating a second set of resources and a transmit power reduction amount that the second UE needs to comply with for a second sidelink transmission by the second UE via the second set of resources, wherein the second set of resources overlaps with the first set of resources; and a component for receiving a second sidelink transmission from the second UE via the second set of resources or receiving a first sidelink transmission from the third UE via the first set of resources according to the indicated transmit power reduction amount.

[0009] A non-transitory computer-readable medium storing code for wireless communication at a first UE is described. The code may include instructions executable by a processor to perform the following operations: receiving, by the first UE, first sidelink control information that reserves a first set of resources for a first sidelink transmission by a third UE; sending an inter-UE coordination message to a second UE, the inter-UE coordination message indicating a second set of resources and a transmit power reduction amount that the second UE needs to comply with for a second sidelink transmission by the second UE via the second set of resources, wherein the second set of resources overlaps with the first set of resources; and receiving a second sidelink transmission from the second UE via the second set of resources according to the indicated transmit power reduction amount, or receiving a first sidelink transmission from the third UE via the first set of resources.

[0010] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending an inter-UE coordination message may include operations, features, components, or instructions for sending a resource set type in the inter-UE coordination message, the resource set type indicating that the second set of resources includes non-preferred resources.

[0011] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending an inter-UE coordination message may include operations, features, components, or instructions for sending the following indication: the inter-UE coordination message indicates an amount of transmit power reduction that a second UE needs to comply with for a second side link transmission by the second UE via a second set of resources.

[0012] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the inter-UE coordination message includes second sidelink control information or a medium access control control element.

[0013] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for determining that measurements performed on first sidelink control information from a third UE fail to meet a threshold, wherein sending the inter-UE coordination message to the second UE may be based on the measurements failing to meet the threshold.

[0014] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, sending an inter-UE coordination message may include operations, features, components, or instructions for sending an inter-UE coordination message with a cyclic shift that indicates an amount of transmit power reduction that a second UE needs to comply with for a second side link transmission by the second UE via a second set of resources.

[0015] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a first UE may be configured with a set of multiple cyclic shifts, and a first cyclic shift in the set of multiple cyclic shifts indicates that a second UE may avoid transmitting a second sidelink transmission via a second set of resources, and each other cyclic shift in the set of multiple cyclic shifts indicates a different transmit power reduction amount for the second sidelink transmission by the second UE via the second set of resources that the second UE needs to comply with.

[0016] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for determining to send an inter-UE coordination message to a second UE based on the second sidelink transmission being associated with a lower priority than the first sidelink transmission.

[0017] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for receiving, by the first UE, signaling to reserve a second set of resources for a second sidelink transmission by the second UE.

[0018] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a first sidelink transmission from a third UE may be directed to a first UE, and the methods, apparatus, and non-transitory computer-readable media may include further operations, features, components, or instructions for determining that a first measurement performed on the signaling exceeds a first threshold or a difference between the first measurement and a second measurement performed on the first sidelink control information exceeds a second threshold, wherein sending an inter-UE coordination message to the second UE may be based on the determination.

[0019] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, a second sidelink transmission from a second UE may be directed to a first UE, and the methods, apparatus, and non-transitory computer-readable media may include further operations, features, components, or instructions for determining that a first measurement performed on first sidelink control information exceeds a first threshold or a difference between the first measurement and a second measurement performed on signaling exceeds a second threshold, wherein sending an inter-UE coordination message to the second UE may be based on the determination.

[0020] A method for wireless communication at a second UE is described. The method may include: receiving an inter-UE coordination message from a first UE, the inter-UE coordination message indicating a second set of resources and a transmit power reduction amount that the second UE needs to comply with for a second sidelink transmission by the second UE via the second set of resources, wherein the second set of resources overlaps with a first set of resources reserved by first sidelink control information for a first sidelink transmission by a third UE; and transmitting the second sidelink transmission via the second set of resources according to the indicated transmit power reduction amount.

[0021] An apparatus for wireless communication is described. The apparatus may include: a memory; a transceiver; and at least one processor of a second UE, the at least one processor coupled to the memory and the transceiver. The at least one processor may be configured to: receive an inter-UE coordination message from a first UE, the inter-UE coordination message indicating a second set of resources and a transmit power reduction amount that the second UE needs to comply with for a second sidelink transmission by the second UE via the second set of resources, wherein the second set of resources overlaps with a first set of resources reserved by the first sidelink control information for a first sidelink transmission by a third UE; and transmit the second sidelink transmission via the second set of resources according to the indicated transmit power reduction amount.

[0022] Another apparatus for wireless communication at a second UE is described. The apparatus may include: means for receiving an inter-UE coordination message from a first UE, the inter-UE coordination message indicating a second set of resources and a transmit power reduction amount that the second UE needs to comply with for a second sidelink transmission by the second UE via the second set of resources, wherein the second set of resources overlaps with a first set of resources reserved by the first sidelink control information for a first sidelink transmission by a third UE; and means for transmitting the second sidelink transmission via the second set of resources in accordance with the indicated transmit power reduction amount.

[0023] A non-transitory computer-readable medium storing code for wireless communication at a second UE is described. The code may include instructions executable by a processor to: receive an inter-UE coordination message from a first UE, the inter-UE coordination message indicating a second set of resources and a transmit power reduction amount that the second UE needs to comply with for a second sidelink transmission by the second UE via the second set of resources, wherein the second set of resources overlaps with a first set of resources reserved by the first sidelink control information for a first sidelink transmission by a third UE; and transmit the second sidelink transmission via the second set of resources according to the indicated transmit power reduction amount.

[0024] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving an inter-UE coordination message may include operations, features, components, or instructions for receiving a resource set type in the inter-UE coordination message, the resource set type indicating that the second set of resources includes non-preferred resources.

[0025] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving an inter-UE coordination message may include operations, features, components, or instructions for receiving an indication that a second UE needs to comply with for a second side link transmission by the second UE via a second set of resources.

[0026] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for sending a request for an inter-UE coordination message to the first UE, wherein receiving the inter-UE coordination message from the first UE may be based on sending the request.

[0027] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the inter-UE coordination message includes second sidelink control information or a medium access control control element.

[0028] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving an inter-UE coordination message may include operations, features, components, or instructions for receiving an inter-UE coordination message with a cyclic shift indicating an amount of transmit power reduction that a second UE needs to comply with for a second side link transmission by the second UE via a second set of resources.

[0029] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the second side link transmission can be associated with a lower priority than the first side link transmission, and receiving the inter-UE coordination message can be associated with a lower priority than the first side link transmission based on the second side link transmission.

[0030] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for sending signaling to reserve a second set of resources for a second sidelink transmission by a second UE. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 An example of a wireless communication system supporting transmit power adjustment based on inter-user equipment (UE) coordination (IUC) according to one or more aspects of the present disclosure is illustrated.

[0032] Figure 2 An example of a wireless communication system supporting IUC-based transmit power adjustment according to one or more aspects of the present disclosure is illustrated.

[0033] Figure 3 Examples of non-preferred resources according to one or more aspects of the present disclosure are illustrated.

[0034] Figure 4 Examples of conflicting resources according to one or more aspects of the present disclosure are illustrated.

[0035] Figure 5 An example of a process flow for supporting IUC-based transmit power adjustment according to one or more aspects of the present disclosure is illustrated.

[0036] Figure 6 and Figure 7 A block diagram of a device supporting IUC-based transmit power adjustment according to one or more aspects of the present disclosure is shown.

[0037] Figure 8 A block diagram of a communication manager supporting IUC-based transmit power adjustment according to one or more aspects of the present disclosure is shown.

[0038] Fig. 9 A diagram of a system including a device supporting IUC-based transmit power adjustment according to one or more aspects of the present disclosure is shown.

[0039] Fig.10 and Fig.11 A flow chart illustrating a method for supporting IUC-based transmit power adjustment according to one or more aspects of the present disclosure is shown. DETAILED DESCRIPTION

[0040] Some wireless communication systems may support sidelink communications between user equipment (UEs). In such systems, it may be appropriate for UEs to exchange messages to coordinate communications on sidelink resources (e.g., to minimize interference and conflicts). Such messages may be referred to as inter-UE coordination (IUC) messages. In one example, if a first UE identifies a non-preferred resource for transmission from a second UE (e.g., based on the non-preferred resource being reserved by a third UE), the first UE may send an IUC message indicating the non-preferred resource to the second UE. In another example, if the first UE detects a conflict between the second UE and the third UE (e.g., the second UE and the third UE reserve the same resource), the first UE may send an IUC message indicating the conflicting resource between the second UE and the third UE to the second UE. In any of these examples, the second UE may avoid transmitting on non-preferred resources or conflicting resources to avoid interference and conflicts. Improved techniques for utilizing non-preferred resources or conflicting resources may be required.

[0041] The described technology relates to IUC-based transmit power adjustment to improve utilization of non-preferred resources, conflicting resources, or other communication resources. In one aspect, when a first UE identifies non-preferred resources for sidelink transmissions from a second UE, the first UE can send an indication of the non-preferred resources to the second UE and an indication of an amount of transmit power reduction for sidelink transmissions on the non-preferred resources that the second UE needs to comply with. On the other hand, when the first UE identifies conflicting resources reserved by the second UE and a third UE, the first UE can send an indication of an amount of transmit power reduction for sidelink transmissions on these conflicting resources that the second UE needs to comply with.

[0042] Thus, the first UE may indicate a set of resources that the first UE prefers the second UE not to transmit on, and a requested level of power reduction if the second UE is still transmitting on those resources. If the second UE reduces its transmit power, the second UE is still able to transmit on these resources, which may provide one or more benefits in addition to the first UE indicating the degree of transmit power reduction. For example, because the second UE can transmit on these non-preferred resources or these conflicting resources at a reduced power (e.g., rather than suppressing transmission on these non-preferred resources or these conflicting resources), the utilization of these non-preferred resources or these conflicting resources may be improved, as well as other possible benefits.

[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 by and with reference to apparatus diagrams, system diagrams, and flow diagrams related to IUC-based transmit power adjustment.

[0044] Figure 1An example of a wireless communication system 100 supporting IUC-based transmit power adjustment according to one or more aspects of the present disclosure is illustrated. The wireless communication system 100 may include one or more network entities 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, a New Radio (NR) network, or a network operating according to other systems and radio technologies including future systems and radio technologies not explicitly mentioned herein.

[0045] The network entities 105 may be dispersed throughout a geographic area to form the wireless communication system 100 and may include devices in different forms or with different capabilities. In various examples, the network entities 105 may be referred to as network elements, mobility elements, radio access network (RAN) nodes, or network equipment, among other names. In some examples, the network entities 105 and the UE 115 may communicate wirelessly via one or more communication links 125 (e.g., radio frequency (RF) access links). For example, the network entity 105 may support a coverage area 110 (e.g., a geographic coverage area) within which the UE 115 and the network entity 105 may establish one or more communication links 125. The coverage area 110 may be an example of a geographic area within which the network entity 105 and the UE 115 may support signal communications according to one or more radio access technologies (RATs).

[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 or mobile, or both stationary and mobile at different times. The UEs 115 may be devices in different forms or with different capabilities. Figure 1 Some example UEs 115 are illustrated in FIG. 1. The UEs 115 described herein may be capable of supporting communication with various types of devices such as Figure 1 Other UEs 115 or network entities 105 are shown communicating.

[0047] As described herein, a node of the wireless communication system 100 (which may be referred to as a network node or a wireless node) may be a network entity 105 (e.g., any network entity described herein), a UE 115 (e.g., any UE described herein), a network controller, an apparatus, a device, a computing system, one or more components, or another suitable processing entity configured to perform any of the techniques described herein. For example, the node may be a UE 115. As another example, the node may be a network entity 105. As another example, a first node may be configured to communicate with a second node or a third node. In one aspect of this example, the first node may be a UE 115, the second node may be a network entity 105, and the third node may be a UE 115. In another aspect of this example, the first node may be a UE 115, the second node may be a network entity 105, and the third node may be a network entity 105. In yet other aspects of this example, the first node, the second node, and the third node may be different relative to these examples. Similarly, references to UE 115, network entity 105, apparatus, device, computing system, etc. may include disclosure of UE 115, network entity 105, apparatus, device, computing system, etc. as a network node. For example, a disclosure that UE 115 is configured to receive information from network entity 105 also discloses that the first node is configured to receive information from the second node.

[0048] In some examples, the network entities 105 may communicate with the core network 130, or with each other, or both. For example, the network entities 105 may communicate with the core network 130 via one or more backhaul communication links 120 (e.g., according to S1, N2, N3, or other interface protocols). In some examples, the network entities 105 may communicate with each other via the backhaul communication links 120 (e.g., according to X2, Xn, or other interface protocols) directly (e.g., directly between the network entities 105) or indirectly (e.g., via the core network 130). In some examples, the network entities 105 may communicate with each other via the midhaul communication links 162 (e.g., according to the midhaul interface protocol) or the fronthaul communication links 168 (e.g., according to the fronthaul interface protocol) or any combination thereof. The backhaul communication links 120, the midhaul communication links 162, or the fronthaul communication links 168 may be or include one or more wired links (e.g., electrical links, optical fiber links), one or more wireless links (e.g., radio links, wireless optical links), etc. or various combinations thereof. UE 115 may communicate with core network 130 via communication link 155 .

[0049] One or more of the network entities 105 described herein may include or may be referred to as a base station 140 (e.g., a transceiver base station, a radio base station, an NR base station, an access point, a radio transceiver, a 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 5G NB, a next generation eNB (ng-eNB), a Home Node B, a Home Evolved Node B, or other suitable terms). In some examples, the network entity 105 (e.g., a base station 140) may be implemented in an aggregated (e.g., monolithic, stand-alone) base station architecture, which may be configured to utilize a protocol stack physically or logically integrated within a single network entity 105 (e.g., a single RAN node, such as a base station 140).

[0050] In some examples, the network entity 105 may be implemented in a disaggregated architecture (e.g., a disaggregated base station architecture, a disaggregated RAN architecture) that may be configured to utilize a protocol stack that is physically or logically distributed between two or more network entities 105, such as an integrated access backhaul (IAB) network, an open RAN (O-RAN) (e.g., a network configuration sponsored by the O-RAN Alliance), or a virtualized RAN (vRAN) (e.g., a cloud RAN (C-RAN)). For example, the network entity 105 may include one or more of the following: a central unit (CU) 160, a distributed unit (DU) 165, a radio unit (RU) 170, a RAN intelligent controller (RIC) 175 (e.g., a near real-time RIC (near RT RIC), a non-real-time RIC (non-RT RIC)), a service management and orchestration (SMO) 180 system, or any combination thereof. The RU 170 may also be referred to as a radio head, a smart radio head, a remote radio head (RRH), a remote radio unit (RRU), or a transmit receive point (TRP). One or more components of the network entity 105 in the decomposed RAN architecture may be co-located, or one or more components of the network entity 105 may be located in distributed locations (e.g., separate physical locations). In some examples, one or more network entities 105 of the decomposed RAN architecture may be implemented as virtual units (e.g., virtual CU (VCU), virtual DU (VDU), virtual RU (VRU)).

[0051] The functional split between CU 160, DU 165, and RU 170 is flexible and may support different functionalities depending on which functions (e.g., network layer functions, protocol layer functions, baseband functions, RF functions, and any combination thereof) are performed at CU 160, DU 165, or RU 170. For example, a functional split of a protocol stack may be employed between CU 160 and DU 165 such that CU 160 may support one or more layers of a protocol stack and DU 165 may support one or more different layers of a protocol stack. In some examples, CU 160 may host higher protocol layer (e.g., Layer 3 (L3), Layer 2 (L2)) functionality and signaling (e.g., Radio Resource Control (RRC), Service Data Adaptation Protocol (SDAP), Packet Data Convergence Protocol (PDCP)). The CU 160 may be connected to one or more DUs 165 or RUs 170, and the one or more DUs 165 or RUs 170 may host lower protocol layers, such as layer 1 (L1) (e.g., physical (PHY) layer) or L2 (e.g., radio link control (RLC) layer, medium access control (MAC) layer) functionality and signaling, and may each be at least partially controlled by the CU 160. Additionally or alternatively, a functional split of the protocol stack may be employed between the DUs 165 and the RUs 170, such that the DUs 165 may support one or more layers of the protocol stack, and the RUs 170 may support one or more different layers of the protocol stack. The DUs 165 may support one or more different cells (e.g., via one or more RUs 170). In some cases, the functional split between the CU 160 and the DU 165 or between the DU 165 and the RU 170 may be within the protocol layer (e.g., some functions of the protocol layer may be performed by one of the CU 160, DU 165, or RU 170, while other functions of the protocol layer are performed by different ones of the CU 160, DU 165, or RU 170). The CU 160 may be further functionally split into CU control plane (CU-CP) functions and CU user plane (CU-UP) functions. The CU 160 may be connected to one or more DUs 165 via midhaul communication links 162 (e.g., F1, F1-c, F1-u), and the DU 165 may be connected to one or more RUs 170 via fronthaul communication links 168 (e.g., open fronthaul (FH) interface). In some examples, midhaul communication link 162 or fronthaul communication link 168 may be implemented according to an interface (eg, a channel) between layers of a protocol stack supported by respective network entities 105 that communicate via such communication links.

[0052] In some wireless communication systems (e.g., wireless communication system 100), infrastructure and spectrum resources for radio access may support wireless backhaul link capabilities to supplement wired backhaul connections, thereby providing an IAB network architecture (e.g., to the core network 130). In some cases, in an IAB network, one or more network entities 105 (e.g., IAB nodes 104) may be partially controlled by each other. One or more IAB nodes 104 may be referred to as donor entities or IAB donors. One or more DUs 165 or one or more RUs 170 may be controlled in part by one or more CUs 160 associated with a donor network entity 105 (e.g., a donor base station 140). One or more donor network entities 105 (e.g., IAB donors) may communicate with one or more additional network entities 105 (e.g., IAB nodes 104) via supported access and backhaul links (e.g., backhaul communication links 120). The IAB node 104 may include an IAB mobile terminal (IAB-MT) controlled (e.g., scheduled) by a coupled IAB donor's DU 165. The IAB-MT may include an independent set of antennas for relaying communications with the UE 115, or may share the same antennas (e.g., of the RU 170) of the IAB node 104 for access via the DU 165 of the IAB node 104 (e.g., referred to as a virtual IAB-MT (vIAB-MT)). In some examples, the IAB node 104 may include a DU 165 that supports communication links with additional entities (e.g., IAB node 104, UE 115) within a relay chain or configuration (e.g., downstream) of the access network. In such cases, one or more components of the decomposed RAN architecture (e.g., one or more IAB nodes 104 or components of the IAB node 104) may be configured to operate according to the techniques described herein.

[0053] In the case where the techniques described herein are applied to the context of a decomposed RAN architecture, one or more components of the decomposed RAN architecture may be configured to support IUC-based transmit power adjustment as described herein. For example, some operations described as being performed by UE 115 or network entity 105 (e.g., base station 140) may be additionally or alternatively performed by one or more components of the decomposed RAN architecture (e.g., IAB node 104, DU 165, CU 160, RU 170, RIC 175, SMO 180).

[0054] 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 suitable term, where a "device" may also be referred to as a unit, a station, a terminal, or a client, etc. 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 may 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, etc., which may be implemented in various objects such as appliances or vehicles, meters, etc.

[0055] 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 network entities 105 and network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, etc. Figure 1 shown.

[0056] The UE 115 and the network entity 105 may wirelessly communicate with each other via one or more communication links 125 (e.g., access links) using resources associated with one or more carriers. The term "carrier" may refer to a set of RF spectrum resources having a physical layer structure defined for supporting the communication link 125. For example, a carrier for the communication link 125 may include a portion of an RF spectrum band (e.g., a bandwidth portion (BWP)) that operates according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR). Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information), control signaling for coordinating carrier operations, user data, or other signaling. The wireless communication system 100 may support communications with the UE 115 using carrier aggregation or multi-carrier operation. Depending on the carrier aggregation configuration, the UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers. Carrier aggregation may be used for both frequency division duplex (FDD) component carriers and time division duplex (TDD) component carriers. Communication between the network entity 105 and other devices may refer to communication between these devices and any portion (e.g., entity, sub-entity) of the network entity 105. For example, the terms "send," "receive," or "communicate" when referring to the network entity 105 may refer to any portion of a network entity 105 (e.g., base station 140, CU 160, DU 165, RU 170) of a RAN communicating with another device (e.g., directly or via one or more other network entities 105).

[0057] In some examples, such as in a carrier aggregation configuration, a carrier may also have acquisition signaling or control signaling that coordinates the operation of 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 RF Channel Number (EARFCN)) and may be identified according to a channel raster for discovery by UE 115. A carrier may operate in a standalone mode, in which case initial acquisition and connection may be made by UE 115 via the carrier, or a carrier may operate in a non-standalone mode, in which case a different carrier (e.g., of the same or different radio access technology) is used to anchor the connection.

[0058] The communication link 125 shown in the wireless communication system 100 may include downlink transmissions (e.g., forward link transmissions) from the network entity 105 to the UE 115, uplink transmissions (e.g., return link transmissions) from the UE 115 to the network entity 105, or both, as well as other transmission configurations. A carrier may carry either downlink communications or uplink communications (e.g., in an FDD mode), or may be configured to carry both downlink communications and uplink communications (e.g., in a TDD mode).

[0059] A carrier may be associated with a particular bandwidth of the RF spectrum, and in some examples, the carrier bandwidth may be referred to as a "system bandwidth" of the carrier or wireless communication system 100. For example, the carrier bandwidth may be one of a set of bandwidths of carriers for a particular radio access technology (e.g., 1.4 megahertz (MHz), 3 MHz, 5 MHz, 10 MHz, 15 MHz, 20 MHz, 40 MHz, or 80 MHz). Devices of the wireless communication system 100 (e.g., the network entity 105, the UE 115, or both) may have a hardware configuration that supports communications using a particular carrier bandwidth, or may be capable of being configured to support communications using one of the carrier bandwidths in the set of carrier bandwidths. In some examples, the wireless communication system 100 may include a network entity 105 or a UE 115 that supports concurrent communications using carriers associated with multiple carrier bandwidths. In some examples, each served UE 115 may be configured to operate using a portion (e.g., a subband, a BWP) or all of the carrier bandwidth.

[0060] The signal waveform transmitted via the carrier may include multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques, such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM)). In a system employing MCM techniques, a resource element may refer to a resource of one symbol period (e.g., the duration of one modulation symbol) and one subcarrier, in which case the symbol period and the subcarrier spacing may be inversely related. The amount 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), so that a relatively higher amount of resource elements (e.g., in the transmission duration) and a relatively higher order of the modulation scheme may correspond to a relatively higher communication rate. Wireless communication resources may refer to a combination of RF spectrum resources, time resources, and spatial resources (e.g., spatial layers or beams), and the use of multiple spatial resources may increase the data rate or data integrity used for communication with UE 115.

[0061] One or more parameter sets for a carrier may be supported, and a parameter set may include a subcarrier spacing ( ) and cyclic prefix. A carrier may be divided into one or more BWPs with the same or different parameter sets. 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 of a UE 115 may be constrained to one or more active BWPs.

[0062] The time interval for the network entity 105 or the UE 115 may be expressed in multiples of a basic time unit, which may be, for example, a sampling period. seconds, of which may indicate the supported subcarrier spacing, and The supported discrete Fourier transform (DFT) size may be indicated. The time intervals of the 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).

[0063] Each frame may include a plurality of consecutively numbered subframes or time slots, and each subframe or time slot may have the same duration. In some examples, a frame may be divided into subframes (e.g., in the time domain), and each subframe may be further divided into a certain 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 certain number of symbol periods (e.g., depending on the length of the cyclic prefix appended to the front of each symbol period). In some wireless communication systems 100, the time slot may be further divided into a plurality of micro-time slots associated with one or more symbols. Excluding the cyclic prefix, each symbol period may be associated with one or more (e.g., The duration of a symbol period may depend on the subcarrier spacing or the operating frequency band.

[0064] 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 amount 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 a burst of a shortened TTI (sTTI)).

[0065] Physical channels may be multiplexed according to various techniques for communicating using a carrier. Physical control channels and physical data channels may be multiplexed, for example, using one or more of a time division multiplexing (TDM) technique, a frequency division multiplexing (FDM) technique, or a hybrid TDM-FDM technique for signaling via a downlink carrier. A control region (e.g., a control resource set (CORESET)) of a physical control channel may be defined by a set of symbol periods and may extend across a 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 set of UEs 115. For example, one or more of the UEs 115 may monitor or search the 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 in one or more aggregation levels arranged in a cascaded manner. The aggregation level of the control channel candidates may refer to the amount of control channel resources (e.g., control channel elements (CCEs)) associated with coded 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 .

[0066] The network entity 105 may 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" may refer to a logical communication entity used to communicate with the network entity 105 (e.g., using a carrier), and may be associated with an identifier used to distinguish adjacent cells (e.g., a physical cell identifier (PCID), a virtual cell identifier (VCID), or other cell identifier). In some examples, a cell may also refer to a coverage area 110 or a portion of a coverage area 110 (e.g., a sector) on which the logical communication entity operates. Depending on various factors such as the capabilities of the network entity 105, such cells may range from smaller areas (e.g., structures, subsets of structures) to larger areas. For example, a cell may be or may include a building, a subset of a building, or an external space between or overlapping coverage areas 110, and the like.

[0067] A macro cell generally covers a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access to UEs 115 that have service subscriptions with a network provider that supports the macro cell. As compared to a macro cell, a small cell may be associated with a lower power network entity 105 (e.g., a lower power base station 140), and the small cell may operate using the same or different (e.g., licensed, unlicensed) frequency band as the macro cell. A small cell may provide unrestricted access to a UE 115 that has a service subscription with a network provider, or may provide restricted access to a UE 115 associated with a small cell (e.g., a UE 115 in a closed subscriber group (CSG), a UE 115 associated with a user in a home or office). A network entity 105 may support one or more cells, and may also use one or more component carriers to support communications via one or more cells.

[0068] 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.

[0069] In some examples, the network entities 105 (e.g., base stations 140, RUs 170) may be mobile and thus provide communication coverage for mobile coverage areas 110. In some examples, different coverage areas 110 associated with different technologies may overlap, but the different coverage areas 110 may be supported by the same network entity 105. In some other examples, overlapping coverage areas 110 associated with different technologies may be supported by different network entities 105. The wireless communication system 100 may include, for example, a heterogeneous network in which different types of network entities 105 provide coverage for respective coverage areas 110 using the same or different radio access technologies.

[0070] Some UEs 115, such as MTC or IoT devices, may be low-cost or low-complexity devices and may allow automated communication between machines (e.g., via machine-to-machine (M2M) communication). M2M communication or MTC may refer to data communication technology that allows devices to communicate with each other or with a network entity 105 (e.g., base station 140) without human intervention. In some examples, M2M communication or MTC may include communication from devices that integrate sensors or meters to measure or capture information and relay such information to a central server or application that uses the information or presents the information to a person interacting with the application. Some UEs 115 may be designed to collect information or implement automated behavior of machines or other devices. Examples of applications for MTC devices include: smart metering, inventory monitoring, water level monitoring, equipment monitoring, health care monitoring, field survival monitoring, weather and geographic event monitoring, fleet management and tracking, remote security sensing, physical access control, and transaction-based commercial charging.

[0071] Some UEs 115 may be configured to employ an operating mode that reduces power consumption, such as half-duplex communication (e.g., a mode that supports unidirectional communication via transmission or reception but does not transmit and receive concurrently). In some examples, half-duplex communication may be performed with a reduced peak rate. Other power saving techniques for UEs 115 include entering a power saving deep sleep mode when not engaged in active communications, operating using limited bandwidth (e.g., according to narrowband communications), or a combination of these techniques. For example, some UEs 115 may be configured to operate using a narrowband protocol type 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 a carrier.

[0072] The wireless communication system 100 may be configured to support ultra-reliable communication or low-latency communication or various combinations thereof. For example, the wireless communication system 100 may be configured to support ultra-reliable low-latency communication (URLLC). The UE 115 may be designed to support ultra-reliable, low-latency, or critical functions. Ultra-reliable communications may include private or group communications and may be supported by one or more services such as push-to-talk, video, or data. Support for ultra-reliable, low-latency functions may include prioritization of services, and such services may be used for public safety or general commercial applications. The terms ultra-reliable, low-latency, and ultra-reliable low-latency may be used interchangeably herein.

[0073] In some examples, a UE 115 may be configured to support communication directly with other UEs 115 via a device-to-device (D2D) communication link 135 (e.g., according to a peer-to-peer (P2P), D2D, or sidelink protocol). In some examples, one or more UEs 115 in a group that are performing D2D communication may be within a coverage area 110 of a network entity 105 (e.g., a base station 140, a RU 170), which may support aspects of such D2D communication configured by (e.g., scheduled by) the network entity 105. In some examples, one or more UEs 115 in such a group may be outside of the coverage area 110 of the network entity 105, or may otherwise be unable or not configured to receive transmissions from the network entity 105. In some examples, a group of UEs 115 communicating via D2D communication may support a one-to-many (1:M) system, in which each UE 115 transmits to each of the other UEs 115 in the group. In some examples, network entity 105 may facilitate scheduling of resources for D2D communications. In some other examples, D2D communications may be performed between UEs 115 without involving network entity 105.

[0074] 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 of these items. 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, vehicles in the V2X system can communicate with roadside infrastructure (such as roadside units) using vehicle-to-network (V2N) communication, or communicate with the network via one or more network nodes (e.g., network entity 105, base station 140, RU 170), or both.

[0075] 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)) for managing access and mobility and at least one user plane entity (e.g., a serving gateway (S-GW), a packet data network (PDN) gateway (P-GW), or a user plane function (UPF)) for routing packets or interconnecting to an external network. The control plane entity may manage non-access stratum (NAS) functions such as mobility, authentication, and bearer management of UEs 115 served by network entities 105 (e.g., base stations 140) associated with the core network 130. User IP packets may be delivered through the user plane entity, which may provide IP address allocation and other functions. The user plane entity may be connected to IP services 150 for one or more network operators. IP services 150 may include access to the Internet, an intranet, an IP Multimedia Subsystem (IMS), or packet-switched streaming services.

[0076] The wireless communication system 100 may operate using one or more frequency bands that may be in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). Generally speaking, 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 about one decimeter to one meter in length. UHF waves may be blocked or redirected by buildings and environmental features (which may be referred to as clusters), but these waves may be sufficient to penetrate structures so that macro cells provide service to UEs 115 located indoors. Communications using UHF waves may be associated with smaller antennas and shorter ranges (e.g., less than 100 kilometers) than communications using smaller frequencies and longer waves in the high frequency (HF) or very high frequency (VHF) portions of the spectrum below 300 MHz.

[0077] The wireless communication system 100 may also operate in a super high frequency (SHF) region (also known as a centimeter band) that may be in the range of 3 GHz to 30 GHz or an extremely high frequency (EHF) region (also known as a millimeter band) that uses a spectrum (e.g., from 30 GHz to 300 GHz). In some examples, the wireless communication system 100 may support millimeter wave (mmW) communications between a UE 115 and a network entity 105 (e.g., a base station 140, a RU 170), and the EHF antenna of the corresponding device may be smaller and closer than the UHF antenna. In some examples, such technology may facilitate the use of antenna arrays within the device. However, the propagation of EHF transmissions may be subject to even greater attenuation and a shorter range than SHF or UHF transmissions. The technology disclosed herein may be adopted across transmissions using one or more different frequency regions, and the use of frequency bands specified across these frequency regions may vary by country or regulatory agency.

[0078] The wireless communication system 100 may utilize both licensed RF spectrum bands and unlicensed RF spectrum bands. For example, the wireless communication system 100 may employ license assisted access (LAA), LTE unlicensed (LTE-U) radio access technology, or NR technology using unlicensed bands (such as the 5 GHz Industrial, Scientific, and Medical (ISM) band). When operating using unlicensed RF spectrum bands, devices such as network entity 105 and UE 115 may employ carrier sensing for conflict detection and avoidance. In some examples, operations using unlicensed bands may be based on carrier aggregation configuration (e.g., LAA) in conjunction with component carriers operating using licensed bands. Operations performed using unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, among others.

[0079] The network entity 105 (e.g., base station 140, RU 170) or UE 115 may be equipped with multiple antennas that can be used to employ technologies such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communication, or beamforming. The antennas of the network entity 105 or UE 115 may be located in 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, antennas or antenna arrays associated with the network entity 105 may be located at different geographical locations. The network entity 105 may include an antenna array having a set of antenna ports of multiple rows and columns that the network entity 105 can use to support beamforming for communications with the UE 115. Similarly, the UE 115 may include one or more antenna arrays that may support various MIMO or beamforming operations. Additionally or alternatively, the antenna panel may support RF beamforming for signals sent via the antenna ports.

[0080] Beamforming (which may also be referred to as spatial filtering, directional transmission, or directional reception) is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a network entity 105, a UE 115) to shape or steer an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by combining signals communicated via antenna elements of an antenna array so that some signals propagating along a particular orientation relative to the antenna array experience constructive interference, while other signals experience destructive interference. Adjustments to signals communicated via antenna elements may include the transmitting device or the receiving device applying an amplitude offset, a phase offset, or both to signals carried via antenna elements associated with the device. Adjustments associated with each of these antenna elements may be defined by a set of beamforming weights associated with a particular orientation (e.g., relative to the antenna array of the transmitting device or the receiving device or relative to some other orientation).

[0081] The wireless communication system 100 may be a packet-based network that operates according to a layered protocol stack. In the user plane, communications at the bearer or PDCP layer may be IP-based. The RLC layer may perform packet segmentation and reassembly to communicate via logical channels. The MAC layer may perform priority handling and multiplexing of logical channels into transport channels. The MAC layer may also implement error detection techniques, error correction techniques, or both to support retransmission to improve link efficiency. In the control plane, the RRC layer may provide the establishment, configuration, and maintenance of an RRC connection that supports radio bearers of user plane data between the UE 115 and the network entity 105 or the core network 130. The PHY layer may map transport channels to physical channels.

[0082] UE 115 and network entity 105 may support retransmission of data to increase the likelihood that the data is successfully received. Hybrid automatic repeat request (HARQ) feedback (e.g., confirmation (ACK) and negative ACK (NACK)) is a technique for increasing the likelihood of correctly receiving data via a communication link (e.g., communication link 125, D2D communication link 135). HARQ may 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 may improve throughput at the MAC layer under poor radio conditions (e.g., low signal-to-noise ratio conditions). In some examples, a device may support same-slot HARQ feedback, in which case the device may provide HARQ feedback in a specific time slot for data received via a previous symbol in the time slot. In some other examples, the device may provide HARQ feedback in a subsequent time slot or according to some other time interval.

[0083] In the wireless communication system 100, sidelink communications may include communications on one or more sidelink channels. For example, sidelink data transmissions may be performed on a physical sidelink shared channel (PSSCH), sidelink discovery expression transmissions may be performed on a physical sidelink discovery channel (PSDCH) (e.g., to allow neighboring devices to discover each other's presence), sidelink control information transmissions may be performed on a physical sidelink control channel (PSCCH), sidelink feedback transmissions may be performed on a physical sidelink feedback channel (PSFCH), and sidelink broadcast transmissions may be performed on a physical sidelink broadcast channel (PSBCH). Sidelink communications may also include sending reference signals from one UE 115 to another UE 115.

[0084] In some aspects, the network entity 105 may facilitate the scheduling of resources for sidelink communications (e.g., in resource allocation mode-1 or mode-1 sidelink communications). In other aspects, sidelink communications may be performed between UEs 115 without the involvement of the network entity 105 (e.g., in resource allocation mode-2 or mode-2 sidelink communications). In mode 2 sidelink communications, the sidelink UE 115 may autonomously reserve resources (e.g., without the involvement of the network entity 105). That is, mode 2 sidelink communications may be supported in the absence of a central entity (e.g., such as the network entity 105). After identifying resources to be reserved for one or more sidelink transmissions, the UE 115 may send sidelink control information (SCI) on the sidelink resources to reserve the identified resources.

[0085] In some cases, in order to improve scheduling and avoid interference and conflicts (e.g., in mode 2 sidelink communications), UE 115 may exchange messages to coordinate communications on sidelink resources. Such messages may be referred to as IUC messages. In one example, if the first UE 115 identifies a non-preferred resource for transmission from the second UE 115 (e.g., based on the non-preferred resource being reserved by the third UE 115), the first UE 115 may send an IUC message indicating the non-preferred resource to the second UE 115. In another example, if the first UE 115 detects a conflict between the second UE 115 and the third UE 115 (e.g., the second UE 115 and the third UE 115 reserve the same resource), the first UE 115 may send an IUC message indicating the conflicting resource between the second UE 115 and the third UE 115 to the second UE 115. In any of these examples, the second UE 115 may avoid transmitting on a non-preferred resource or a conflicting resource to avoid interference and conflict. Improved techniques for utilizing non-preferred or conflicting resources may be needed.

[0086] The described technology relates to IUC-based transmit power adjustment to improve utilization of non-preferred resources, conflicting resources, or other communication resources. In one aspect, when a first UE 115 identifies a non-preferred resource for a sidelink transmission from a second UE 115, the first UE 115 can send an indication of the non-preferred resource and an indication of an amount of transmit power reduction for sidelink transmission on the non-preferred resource that the second UE 115 needs to comply with to the second UE 115. In another aspect, when the first UE 115 identifies a conflicting resource reserved by the second UE 115 and a third UE 115, the first UE 115 can send an indication of an amount of transmit power reduction for sidelink transmission on the conflicting resource that the second UE 115 needs to comply with. Because the second UE 115 can transmit on the non-preferred resource or conflicting resource at a reduced power (e.g., instead of suppressing transmission on the non-preferred resource or conflicting resource), utilization of the non-preferred resource or conflicting resource can be improved.

[0087] Figure 2 An example of a wireless communication system 200 supporting IUC-based transmit power adjustment according to one or more aspects of the present disclosure is illustrated. The wireless communication system 200 includes a first UE 115-a, a second UE 115-b, and a third UE 115-c, which may be reference UEs. Figure 1 Examples of UEs 115 are described. For example, the first UE 115-a may be an example of UE-A, the second UE 115-b may be an example of UE-B, and the third UE 115-c may be an example of another UE 115. The wireless communication system 200 may implement aspects of the wireless communication system 100. For example, the wireless communication system 200 may support efficient techniques for IUC-based transmit power adjustment to improve utilization of communication resources.

[0088] In one aspect, the first UE 115-a may receive an SCI 210 from a third UE 115-c that reserves resources for sidelink transmissions by the third UE 115-c, and the first UE 115-a may determine that the resources reserved by the third UE 115-c are not preferred for sidelink transmissions by the second UE 115-b. Resources reserved by the third UE 115-c that are non-preferred for sidelink transmissions by the second UE 115-b may be referred to as non-preferred resources. The first UE 115-a may send an IUC message 205 to the second UE 115-b, indicating an amount of transmit power reduction for sidelink transmissions on non-preferred resources that the second UE 115-b needs to comply with. The indication of non-preferred resources in the IUC message 205 may correspond to a first scheme (e.g., Scheme 1) for IUC.

[0089] In some examples, in an IUC message 205 (e.g., IUC information) from a first UE 115-a to a second UE 115-b, if the second UE 115-b determines to transmit on non-preferred resources indicated in the IUC message 205, the first UE 115-a may explicitly indicate to the second UE 115-b the amount of transmit power reduction (e.g., how much the second UE 115-b should reduce its transmit power). The IUC message 205 (e.g., IUC information) may be an SCI message or a MAC-CE, and the indication of the amount of transmit power reduction may be included in one or more fields of the SCI message or the MAC-CE. In one example, the first UE 115-a may notify the second UE 115-b that if the second UE 115-b determines to transmit on non-preferred resources, the second UE 115-b should reduce its transmit power by 1 dB, 3 dB, 5 dB, etc. In some examples, the IUC message 205 may indicate an index to a list of different transmit power reduction amounts, and the index may correspond to the transmit power reduction amount for sidelink transmissions on non-preferred resources that the second UE 115-b needs to comply with.

[0090] On the other hand, the first UE 115-a may receive an SCI 210 from a third UE 115-c that reserves resources for a sidelink transmission performed by the third UE 115-c, and the first UE 115-a may receive an SCI from a second UE 115-b that reserves resources for a sidelink transmission performed by the second UE 115-b. The first UE 115-a may determine that the resources reserved by the third UE 115-c overlap with the resources reserved by the second UE 115-b. Overlapping resources may be referred to as conflicting resources. The first UE 115-a may send an IUC message 205 to the second UE 115-b, indicating an amount of transmit power reduction that the second UE 115-b needs to comply with for the sidelink transmission performed by the second UE 115-b on the conflicting resources. The indication of conflicting resources in the IUC message 205 may correspond to a second scheme (e.g., Scheme 2) for IUC.

[0091] In some examples, the first UE 115-a may send an IUC message 205 with a cyclic shift that corresponds to an amount of transmit power reduction that the second UE 115-b needs to comply with for sidelink transmissions by the second UE 115-b on conflicting resources. The IUC message 205 may be a PSFCH waveform (e.g., a PSFCH format 0 waveform). In some examples, multiple cyclic shifts (e.g., 12 cyclic shifts) may be possible or available for the PSFCH waveform. Each cyclic shift may be defined by a cyclic shift offset (m_CS) and an initial cyclic shift (m_0). For example, (m_0 + m_CS) may be one of the cyclic shifts available for the PSFCH waveform. Of the 12 cyclic shifts, up to six cyclic shifts may be assigned for m_0. For example, m_CS may be set to zero, and six different values ​​of m_0 may be assigned for six different cyclic shifts.

[0092] In some examples, m_CS can be set to one of a set of remaining values ​​corresponding to a set of remaining cyclic shifts to indicate the transmit power adjustment that the second UE 115-b should make if the second UE 115-b determines to transmit on the conflicting resources indicated by the first UE 115-a. In one example, m_0 can be set to zero and m_CS can be set to zero to indicate zero or no transmit power adjustment. In another example, m_0 can be set to zero and m_CS can be set to six to indicate a 3dB transmit power adjustment. Therefore, if the first UE 115-a sends PSFCH format 0 with m_CS set to zero, the second UE 115-b can avoid using the conflicting resources for the sidelink transmission by the second UE 115-b. If the first UE 115-a sends PSFCH format 0 with m_CS set to six, the second UE 115-b can use the conflicting resources for the sidelink transmission by the second UE 115-b as long as the second UE 115-b reduces the transmit power by 3dB.

[0093] In some aspects, the first UE 115-a may receive an IUC request from the second UE 115-b, or a condition may be triggered at the first UE 115-a to send an IUC message 205. The first UE 115-a may send the IUC message 205 to the second UE 115-b, and the second UE 115-b may receive the IUC message 205 from the first UE 115-a, and the IUC message 205 may be used for resource selection or reselection for data transmission from the second UE 115-b. In some examples, the first UE 115-a may not be the target receiver of the data transmission from the second UE 115-b. In other examples, the first UE 115-a may be the target receiver of the data transmission from the second UE 115-b (e.g., when the transmission of the IUC message 205 is triggered by a request from the second UE 115-b).

[0094] The IUC message 205 may be able to carry or indicate a preferred resource or non-preferred resource identified by the first UE 115-a for transmission by the second UE 115-b. According to the technology described herein, when the IUC message 205 includes non-preferred resources, the IUC message 205 may also indicate how much the second UE 115-b should reduce the transmission power in order to use the non-preferred resources. In some examples, whether the transmission of the IUC message 205 can be triggered by a request from the second UE 115-b can be enabled or disabled by configuration. In some examples, whether the transmission of the IUC message 205 can be triggered by a condition at the first UE 115-a can be enabled or disabled by configuration. In some examples, the first UE 115-a can support or implement mode 2 side link communication.

[0095] The indication of preferred resources using the IUC message 205 may enable transmit resource selection based on channel sensing at the receiving UE 115. The indication of non-preferred resources using the IUC message 205 (e.g., according to the described techniques) may enable transmit resource selection based on assistance from the receiving UE 115. Triggering the sending of the IUC message 205 based on a request from the second UE 115-b may enable intelligent or enhanced transmit resource selection. Triggering the sending of the IUC message 205 based on a condition at the first UE 115-a may enable protection of receiver resources by the receiving UE 115. In some examples, transmit resource selection may be based on (e.g., based solely on) channel sensing at the transmitter UE 115, without the receiving UE 115 protecting receiver resources.

[0096] The IUC message 205 may indicate a preferred resource and may be triggered by a request from the second UE 115-b if the second UE 115-b determines to request the first UE 115-a to notify the second UE 115-b of the transmit resources for transmission by the second UE 115-b (e.g., if the first UE 115-a is the intended recipient of transmissions from the second UE 115-b). The IUC message 205 may indicate a preferred resource and may be triggered by a condition at the first UE 115-a if the first UE 115-a determines to notify the second UE 115-b of the transmit resources for transmission by the second UE 115-b (e.g., if the first UE 115-a is the intended recipient of transmissions from the second UE 115-b).

[0097] The IUC message 205 may indicate non-preferred resources and may be triggered by a request from the second UE 115-b if the second UE 115-b determines to request the first UE 115-a to notify the second UE 115-b of transmit resources for the second UE 115-b to transmit at reduced power (e.g., where the first UE 115-a may or may not be a target receiver for transmissions from the second UE 115-b). The IUC message 205 may indicate non-preferred resources and may be triggered by a condition at the first UE 115-a if the first UE 115-a determines to notify the second UE 115-b of transmit resources for the second UE 115-b to transmit at reduced power (e.g., where the first UE 115-a may or may not be a target receiver for transmissions from the second UE 115-b).

[0098] In some implementations, the first UE 115 - a may send an indication of non-preferred resources in the IUC message 205 based on resources reserved by one or more other UEs (eg, the third UE 115 - c ).

[0099] In some examples, the non-preferred resources may include reserved resources for a third UE 115-c (e.g., another UE 115) identified by a first UE 115-a whose reference signal received power (RSRP) measurement value is greater than an RSRP threshold. The first UE 115-a may determine the RSRP threshold for the third UE 115-c based on a priority value indicated by the SCI 210 of the third UE 115-c. When the first UE 115-a is an intended receiver of transmissions from a second UE 115-b, the first UE 115-a may determine that the second UE 115-b will avoid transmitting on the non-preferred resources because, if the second UE 115-b transmits on the non-preferred resources, the transmissions from the second UE 115-b may experience interference from the third UE 115-c (e.g., the first UE 115-a is less likely to receive the transmissions from the second UE 115-b due to the interference from the third UE 115-c). For example, the RSRP of transmissions from the third UE 115-c may be higher, and thus the first UE 115-a may determine that the second UE 115-b will avoid transmitting on the same resources as the third UE 115-c (e.g., because transmissions from the third UE 115-c may interfere with reception of transmissions from the second UE 115-b at the first UE 115-a).

[0100] In some other examples, the non-preferred resources may include reserved resources for a third UE 115-c (e.g., another UE 115) identified by the first UE 115-a whose RSRP measurement value is less than an RSRP threshold. When the first UE 115-a is the destination or intended receiver of a transport block transmitted by the third UE 115-c, the first UE 115-a may determine the RSRP threshold for the third UE 115-c based on a priority value indicated by the SCI 210 of the third UE 115-c. When the first UE 115-a is the intended receiver of the third UE 115-c, the first UE 115-a may determine that the second UE 115-b will transmit at a reduced transmit power on the resources reserved by the third UE 115-c because the first UE 115-c may receive transmissions from the third UE 115-c on the resources reserved by the third UE 115-c. For example, the RSRP for transmissions from the third UE 115-c may be lower, and the first UE 115-a may determine that the second UE 115-b is to transmit at a reduced transmit power on the same resources as the third UE 115-c (e.g., because otherwise the second UE 115-b may cause too much interference to reception at the first UE 115-a).

[0101] In some implementations, the first UE 115-a may send an indication of non-preferred resources in the IUC message 205 based on resources reserved by the first UE 115-a. The first UE 115-a may be an intended receiver of transmissions from the second UE 115-b. The non-preferred resources may include resources (e.g., time slots) in which the first UE 115-a (e.g., when it is the intended receiver of the second UE 115-b) does not expect to perform sidelink reception from the second UE 115-b due to half-duplex operation. For example, the non-preferred resources may include resources to be used by the first UE 115-a for sidelink transmissions (e.g., because when operating in half-duplex mode, the first UE 115-a may not be able to simultaneously send sidelink transmissions and receive sidelink transmissions from the second UE 115-b).

[0102] Figure 3 An example of a non-preferred resource 300 in accordance with one or more aspects of the present disclosure is illustrated.

[0103] In a first example 300-a, a first UE 115-a may identify a transmission 305 from a third UE 115-c, and the first UE 115-a may determine that the transmission 305 is associated with an RSRP greater than an RSRP threshold (e.g., a subchannel reserved by the third UE 115-c may be expected to include a transmission having an RSRP greater than the RSRP threshold). The RSRP threshold may be based (e.g., at least) on a priority of the third UE 115-c and a mapping between the priority and the threshold. Because the transmission 305 may be associated with an RSRP greater than the RSRP threshold, the first UE 115-a may determine that the resources reserved for the transmission 305 are non-preferred resources for the second UE 115-b. That is, the first UE 115-a may prefer that the second UE 115-b avoid transmitting 305 to the first UE 115-a on resources reserved by the third UE 115-c for the transmission 310. The transmission 305 from the third UE 115-c may or may not be intended for the first UE 115-a. Accordingly, the first UE 115-a may send an IUC message 315 indicating non-preferred resources to the second UE 115-b.

[0104] In a second example 300-b, the first UE 115-a may identify a transmission 320 from a third UE 115-c intended for the first UE 115-a, and the first UE 115-a may determine that the transmission 320 is associated with an RSRP that is less than an RSRP threshold (e.g., the subchannel reserved by the third UE 115-c may be expected to include a transmission having an RSRP that is less than the RSRP threshold). The RSRP threshold may be based (e.g., at least) on a priority of the third UE 115-c and a mapping between the priority and the threshold. Because the transmission 320 may be associated with an RSRP that is less than the RSRP threshold, the first UE 115-a may determine that the resources reserved for the transmission 320 are non-preferred resources for the second UE 115-b. If the second UE 115-b reduces transmit power, the first UE 115-a may determine that the second UE 115-b may transmit on the resources reserved by the third UE 115-c for the transmission 320. The first UE 115-a may send an IUC message 325 to the second UE 115-b indicating the non-preferred resources and indicating an amount of transmit power reduction for transmissions on the non-preferred resources that the second UE 115-b needs to comply with.

[0105] In some examples, the second UE 115-b may use a MAC-CE or SCI 2-C ​​message for an IUC request (e.g., a request for an IUC message). The MAC-CE and SCI 2-C ​​request formats may be the same (e.g., may include the same fields). The IUC request format may enable the second UE 115-b to send transmission parameters (e.g., priority, number of subchannels, resource reservation interval (RRI), and resource selection window (RSW) start or end time) for an intended transmission by the second UE 115-b. The IUC request format may also enable the second UE 115-b to indicate which resource set type (e.g., preferred resources or non-preferred resources) to include in the IUC information (e.g., an IUC message).

[0106] In some examples, the first UE 115-a may use a MAC-CE or SCI 2-C ​​for IUC information. The MAC-CE and SCI2-C formats may be the same (e.g., may include the same fields). The MAC-CE may be used to indicate more than two preferred or non-preferred resources, and the MAC-CE or SCI 2-C ​​may be used to indicate two or fewer preferred or non-preferred resources. Each preferred or non-preferred resource may be indicated using a time resource indicator value (TRIV) (e.g., time offset), a frequency resource indicator value (FRIV) (e.g., frequency offset), and an RRI. The IUC information may include a provision or request indicator, a resource combination (e.g., the number of resources indicated in the IUC information), a first resource position, a reference time slot position, a resource set type, a lowest subchannel index of the first resource position of each TRIV, or any combination thereof. The resource set type may indicate whether the IUC information indicates a preferred resource or a non-preferred resource.

[0107] In some aspects, the first UE 115-a may receive an SCI from the second UE 115-b that reserves resources for sidelink transmission, and if the first UE 115-a detects an expected or potential resource conflict with the second UE 115-b, the first UE 115-a may send an IUC message to the second UE 115-b. The first UE 115-a may or may not be the target receiver of the transmission from the second UE 115-b. The second UE 115-b may receive an IUC message from the first UE 115-a, and the second UE 115-b may use the IUC message for resource selection or reselection. The IUC message may include an indication of an expected or potential resource conflict. In some examples, the first UE 115-a may support or implement mode 2 sidelink communication. In some examples, the IUC may be enabled, disabled, or controlled by configuration.

[0108] The first UE 115-a may correspond to a UE 115 that detects an expected or potential conflict on a resource indicated or reserved by an SCI from a second UE 115-b and sends IUC information to the second UE 115-b. The expected or potential conflict may include conflicting resources reserved by the second UE 115-b and at least one other UE 115. The conflicting resources may also refer to conflicting transmission blocks. The first UE 115-a may be the destination UE of at least one of the conflicting transmission blocks (e.g., a transmission block to be sent in the expected or potential conflicting resources). Whether a non-target UE 115 for a transmission block sent by the second UE 115-b may be the first UE 115-a may be indicated to the UE 115 or configured in the local storage of the UE 115.

[0109] The second UE 115-b may correspond to a UE 115 that transmits a PSCCH or PSSCH with an SCI indicating reserved resources to be used for transmission by the second UE 115-b, receives IUC information indicating an expected or potential resource conflict for the reserved resources from the first UE 115-a, and uses the IUC information to determine resource reselection or to transmit on the conflicting resources at a reduced transmit power. A field in SCI format 1-A carrying an "IndicationUEB" bit may be used to indicate whether the UE 115 scheduling the conflicting transport block may be the second UE 115-b (e.g., if "indicationUEBScheme2" is set to "enabled").

[0110] Figure 4 An example of conflicting resources 400 in accordance with one or more aspects of the present disclosure is illustrated.

[0111] In a first example 400-a, a first UE 115-a may receive a resource reservation for a transmission 405 from a third UE 115-c that conflicts with a resource reservation for a transmission 410 from a second UE 115-b. The second UE 115-b may be a target transmitter of the transmission 410 to the first UE 115-a, and the transmission 405 from the third UE 115-c may interfere with the transmission 410 from the second UE 115-b. The first UE 115-a may send an IUC message 415 (e.g., a resource conflict indication) to the second UE 115-b indicating an amount of transmit power reduction for the transmission 410 (e.g., on the conflicting resources) that the second UE 115-b needs to comply with. The first UE 115-a may determine to send the IUC message 415 to the second UE 115-b (e.g., instead of the third UE 115-c) based on the second UE 115-b being associated with a lower priority than the first UE 115-b. A lower priority may correspond to a higher priority value (e.g., seven), and a higher priority may correspond to a lower priority value (e.g., zero).

[0112] In a second example 400-b, the first UE 115-a may receive a resource reservation for a transmission 425 from the second UE 115-b that conflicts with a resource reservation for a transmission 420 from a third UE 115-c. The third UE 115-c may be a target transmitter of the transmission 420 to the first UE 115-a, and the transmission 425 from the second UE 115-b may interfere with the transmission 420 from the third UE 115-c. The first UE 115-a may send an IUC message 430 (e.g., a resource conflict indication) to the second UE 115-b indicating an amount of transmit power reduction for the transmission 425 (e.g., on the conflicting resources) that the second UE 115-b needs to comply with. In some examples, if "Non-destination UE for transport block sent by UE-B may be UE-A" is enabled, the first UE 115-a may send the IUC message 430 to the second UE 115-b (e.g., the first UE 115-a may be allowed to send the IUC message 430 to the second UE 115-b). The first UE 115-a may determine to send the IUC message 430 to the second UE 115-b (e.g., instead of the third UE 115-c) based on the second UE 115-b being associated with a lower priority than the first UE 115-b. A lower priority may correspond to a higher priority value (e.g., seven), and a higher priority may correspond to a lower priority value (e.g., zero).

[0113] In some examples, the first UE 115-a may support one or more techniques for determining that a resource conflict exists with a transmission from a second UE 115-b. For example, the first UE 115-a may expect to receive a transmission from another UE 115 in resource r1, but the second UE 115-b may reserve resource r1 for transmission (e.g., not for the transmission of the first UE 115-a), so there may be a resource conflict. The determination of the resource conflict may depend on how much power the first UE 115-a receives from the second UE 115-b. The first UE 115-a may indicate the resource conflict in r1 to the second UE 115-b using the PSFCH for conflict indication. When the second UE 115-b receives the conflict indication from the first UE 115-a, the second UE 115-b may reduce the transmit power used for transmission on the conflicting resources by the transmit power reduction amount (e.g., XdB) indicated by the first UE 115-a.

[0114] The PSFCH for conflict indication may use a PSFCH format 0 waveform. For example, a PSFCH format 0 from a first UE 115-a may be used to indicate an expected or potential resource conflict on reserved resources indicated by an SCI from a second UE 115-b. In order to allocate PSFCH resources for an IUC message indicating conflicting resources, at least a resource block set for conflict indication (e.g., sl-PSFCH-Conflict-RB-Set) may be configured separately from a resource block set for HARQ-ACK feedback (e.g., sl-PSFCH-RB-Set). The UE 115 may expect to configure different physical resource blocks (PRBs) between the conflict indication and the HARQ-ACK information.

[0115] The first UE 115-a can determine the index of the PSFCH resource for IUC message transmission. For IUC message transmission in the PSFCH resource, the resource identifier (e.g., P_ID) can be the L1-source ID indicated by the SCI from the second UE 115-b, the M_ID can be zero, and for the resource conflict indication for the next reserved resource for the current transmission block transmission or the next transmission block transmission indicated by the SCI from the second UE 115-b, the m_CS value can be zero, and the m_0 value of the resource conflict indication can be derived in the same manner as specified for HARQ-ACK information. In some examples, a waveform parameter (e.g., a cyclic shift offset, i.e., m_CS) can be used to indicate the amount of transmit power reduction that the second UE 115-b needs to comply with for sidelink transmission on the conflicting resources.

[0116] In some examples, the first UE 115-a may select a second UE 115-b to which to send an IUC message based on one or more factors. For example, the first UE 115-a may receive SCI messages from multiple other UEs 115, and the other UEs 115 may reserve conflicting resources. Therefore, it may be appropriate for the first UE 115-a to efficiently select one or more UEs 115 to which to send an IUC message, the IUC message indicating the amount of transmit power reduction that the one or more UEs 115 need to comply with for transmitting on conflicting resources. If "The non-destination UE for the transport block sent by UE-B may be UE-A" ("typeAUEScheme2") is enabled, the first UE 115-a may select a second UE 115-b to which to send an IUC message, even if the second UE 115-b has not yet reserved conflicting resources for transmission to the first UE 115-a.

[0117] In one example, the first UE 115-a may identify resources reserved by UE1, UE2, and UE3. The resource reservation of UE1 may have a priority value of four, the resource reservation of UE2 may have a priority value of zero, and the resource reservation of UE3 may have a priority value of seven. At least UE1 may be the target transmitter of the first UE 115-a (e.g., resources may be reserved for transmission to the first UE 115-a). If UE1 and UE2 reserve a first conflicting resource, UE1 should give up the first conflicting resource because UE1 has a lower priority than UE2. Therefore, for the first conflicting resource, UE1 may be selected as UE-B. If UE1 and UE3 reserve a second conflicting resource, UE3 should give up the second conflicting resource because UE3 has a lower priority than UE1. Therefore, for the second conflicting resource, UE3 may be selected as UE-B. If UE1, UE2, and UE3 reserve a third conflicting resource, UE1 and UE3 should give up the third conflicting resource because both UE1 and UE3 have a lower priority than UE2. Thus, UE1 and UE3 may each be selected as UE-B. If UE2 and UE3 reserve the fourth conflicting resource, the first UE 115-a may avoid sending the IUC message to UE2 or UE3 because UE2 and UE3 are not the target transmitters of the transmission to the first UE 115-a. According to the described techniques, giving up a resource may correspond to transmitting on the resource with a reduced transmit power.

[0118] The selected UE-B may correspond to the second UE 115-b, and the first UE 115-a may send an IUC message to the second UE 115-b indicating that the second UE 115-b will reduce the transmit power for transmitting on the conflicting resources. Between a pair of UEs 115 that reserve conflicting resources (e.g., the same one or more resources), at least one UE 115 may be a target transmitter for the first UE 115-a (e.g., for the first UE 115-a to send an IUC message indicating the conflicting resources), and the UE 115 associated with a lower priority may be selected as UE-B or the second UE 115-b. The first UE 115-a may send an IUC message to the second UE 115-b indicating the amount of transmit power reduction for sidelink transmissions on the conflicting resources (e.g., the resources that the second UE 115-b has waived) that the second UE 115-b needs to comply with. In some examples, if "non-destination UE for transport block transmitted by UE-B may be UE-A" is disabled, then if the conflicting resources reserved by the selected UE-B are not reserved for transmission to the first UE 115-a, the first UE 115-a may not send an IUC message to the selected UE-B. For example, the first UE 115-a may avoid sending an IUC message to UE3 for the second conflicting resources described above (e.g., because the first UE 115-a may not be the destination UE for the transmission from UE3). The actual transmission of the IUC message for the resources with conflict may be determined by the RSRP of the UE 115 that reserved the conflicting resources.

[0119] In some examples, the first UE 115-a may determine that an expected or potential conflict may occur in resources that satisfy one or more conditions.

[0120] In one example, the conflicting resources may include resources reserved by other UEs 115 identified by the first UE 115-a, which may overlap completely or partially in time or frequency with the resources indicated by the SCI from the second UE 115-b. "The non-destination UE of the transport block sent by UE-B may be UE-A" may be enabled. Alternatively, "The non-destination UE of the transport block sent by UE-B may be UE-A" may be disabled, and the destination UE 115 of the conflicting transport block may be the first UE 115-a. For each pair of UEs 115 that schedules a conflicting transport block for which a PSFCH opportunity for resource conflict indication has not yet passed, and if the higher parameter of "indicationUEBScheme2" is set to "enabled", the "indicationUEB" flag is set to one, and the UE 115 with the higher priority value may be UE-B or the second UE 115-b (e.g., where the higher priority value corresponds to a lower priority or less important UE 115). When paired UEs 115 have the same priority value, the first UE 115 - a may use other techniques to determine that one of the UEs 115 is UE-B.

[0121] In another example, the conflicting resources may include resources (e.g., time slots) in which the first UE 115-a is the intended receiver of the second UE 115-b and the first UE 115-a does not expect to perform sidelink reception from the second UE 115-b due to half-duplex operation.

[0122] In some examples, when determining UE-B or the second UE 115-b, the first UE 115-a may consider an SCI received earlier than or equal to a threshold time (e.g., corresponding to sl-MintimeGapPSFCH) before the PSFCH opportunity of the conflict indication. For example, if the first UE 115-a receives SCI messages from UE1, UE2, and UE3 that reserve conflicting resources, but the SCI from UE3 is received after the threshold time before the PSFCH opportunity, the first UE 115-a may select the second UE 115-b from UE1 and UE2. That is, when selecting the second UE 115-b, the first UE 115-a may not consider UE3, and UE3 cannot be UE-B. Therefore, the first UE 115-a may not transmit an IUC message to UE3 because some criteria (e.g., sl-MinTimeGapPSFCH criteria) may not be met (e.g., even though there may still be a conflict between UE1, UE2, and UE3). Between UE1 and UE2, if UE1 is associated with a lower priority than UE2, the first UE 115-a may select UE1 to receive the IUC message.

[0123] In some examples, the resource pool level configuration may support additional criteria for determining conflicting resources (e.g., resources in which an expected or potential resource conflict occurs). If the first UE 115-a is the destination UE 115 of a transport block sent by the second UE 115-b, and the RSRP of the other UE 115 in the conflicting resources is greater than an RSRP threshold (e.g., absolute interference is high) or the difference between the RSRP of the other UE 115 in the conflicting resources and the RSRP of the second UE 115-b in the conflicting resources is greater than an RSRP threshold (e.g., relative interference is high), the first UE 115-a may send an IUC message indicating the conflicting resources to the second UE 115-b. If the first UE 115-a is the destination UE 115 of the transport block sent by the other UE 115, and the RSRP of the second UE 115-b in the conflicting resources is greater than the RSRP threshold (e.g., absolute interference is high) or the difference between the RSRP of the second UE 115-b in the conflicting resources and the RSRP of the other UE 115 in the conflicting resources is greater than the RSRP threshold (e.g., relative interference is high), the first UE 115-a can send an IUC message to the second UE 115-b. The RSRP threshold may or may not depend on the priority of the second UE 115-b, the priority of the other UE 115, or both.

[0124] In one example, the first UE 115-a may identify resources reserved by UE1, UE2, and UE3. The resource reservation of UE1 may have a priority value of four, the resource reservation of UE2 may have a priority value of zero, and the resource reservation of UE3 may have a priority value of seven. At least UE1 may be the target transmitter of the first UE 115-a (e.g., resources may be reserved for transmissions to the first UE 115-a). That is, the first UE 115-a may be the intended receiver of transmissions from UE1. If UE1 and UE2 reserve a first conflicting resource, and the first UE 115-a selects UE1 as UE-B for the first conflicting resource (e.g., where UE2 is referred to as another UE 115), the first UE 115-a may determine that there is an actual conflict in the first conflicting resource, and if the RSRP of UE2 is greater than an RSRP threshold, an IUC conflict indication may be sent to UE1. If UE1 and UE3 reserve the second conflicting resource, and the first UE 115-a selects UE3 as UE-B for the second conflicting resource (e.g., where UE1 is referred to as another UE 115), the first UE 115-a may determine that there is an actual conflict in the second conflicting resource, and may send an IUC conflict indication to UE3 if the RSRP of UE1 is greater than an RSRP threshold. The RSRP threshold may depend on the priority of the second UE 115-b, the priority of the other UE 115, or both.

[0125] In some examples, the resource pool level configuration may include one of one or more options to determine the resources for PSFCH transmissions for conflict indication. Each of these options may be configurable (e.g., enabled or disabled). A minimum time gap between the PSFCH and the time slot in which the SCI is transmitted (e.g., sl-MinTimeGapPSFCH) may be configured for conflict indication. Additionally or alternatively, the PSFCH and the time slot in which the expected or potential resource conflict occurs in the case of a conflict indication. The minimum time gap between time slots on the PSSCH resource indicated by the SCI may be configured for conflict indication.

[0126] In one example, the PSFCH timing may be derived from the time slot in which the SCI from the second UE 115-b is sent. The first UE 115-a may reuse the PSSCH to PSFCH timing to determine the PSFCH timing for the resource conflict indication. The time gap between the PSFCH and the time slot in which the expected or potential resource conflict occurs may be greater than or equal to a threshold time (e.g., If there is a PSFCH opportunity that satisfies the minimum time gap (e.g., sl-MinTimeGapPSFCH) between the PSFCH opportunity and the time slot in which the SCI is transmitted, but does not satisfy the minimum time gap (sl-MinTimeGapPSFCH) between the PSFCH opportunity and the time slot of the earliest reserved PSSCH resources indicated by the corresponding SCI after the PSFCH opportunity ), the PSFCH opportunity may not be used by the first UE 115-a for conflict indication of reserved PSSCH resources other than the earliest reserved PSSCH resources indicated by the corresponding SCI after the PSFCH opportunity.

[0127] In another example, the PSFCH timing may be derived from a time slot in which an expected or potential conflict is transmitted on the PSSCH indicated by the SCI from the second UE 115-b. The first UE 115-a may transmit the PSFCH in a latest time slot that includes PSFCH resources for the IUC message and is at least one time slot in which an expected or potential resource conflict occurs in a resource pool before the PSSCH resources indicated by the SCI of the second UE 115-b. The time gap between the PSFCH and the SCI scheduling the conflicting transport block may be greater than or equal to a threshold time (e.g., sl-MintimeGapPSFCH). If the timeline is not met, the UE 115-a may not send a conflict indication or may not receive a conflict indication.

[0128] Figure 5An example of a process flow 500 for supporting IUC-based transmit power adjustment according to one or more aspects of the present disclosure is illustrated. The process flow 500 includes a first UE 115-a, a second UE 115-b, and a third UE 115-c, which may be reference UEs. Figures 1 to 4 Examples of UEs 115 are described. For example, the first UE 115-a may be an example of UE-A, the second UE 115-b may be an example of UE-B, and the third UE 115-c may be an example of another UE 115. The process flow 500 may implement aspects of the wireless communication system 100 or the wireless communication system 200. For example, the process flow 500 may support efficient techniques for IUC-based transmit power adjustment to improve utilization of communication resources.

[0129] In the following description of process flow 500, signaling exchanged between the first UE 115-a, the second UE 115-b, and the third UE 115-c may be exchanged in a different order than the example order shown, or operations performed by the first UE 115-a, the second UE 115-b, and the third UE 115-c may be performed in a different order or at a different time. Some operations may also be omitted from process flow 500, and other operations may be added to process flow 500.

[0130] At 505, the third UE 115-c may send and the first UE 115-a may receive an SCI reserving a first set of resources for a first sidelink transmission by the third UE 115-c.

[0131] At 510, the second UE 115-b may send, and the first UE 115-a may receive, an SCI (e.g., signaling) reserving a second set of resources for a second side link transmission by the second UE 115-b. The second set of resources reserved by the second UE 115-b may overlap with the first set of resources reserved by the third UE 115-c. The second side link transmission by the second UE 115-b may or may not be directed to the first UE 115-a (e.g., the second side link transmission by the second UE 115-b may cause interference to the first UE 115-a).

[0132] At 515, the first UE 115-a may determine an amount of transmit power reduction that the second UE 115-b needs to comply with for a second side link transmission by the second UE 115-b via a second set of resources. In some examples, at 510, the first UE 115-a may determine an amount of transmit power reduction that the second UE 115-b needs to comply with based on a measurement of the SCI (e.g., received power). In some examples, at 505, the first UE 115-a may determine an amount of transmit power reduction that the second UE 115-b needs to comply with based on a measurement of the SCI (e.g., RSRP).

[0133] At 520, the first UE 115-a may send and the second UE 115-b may receive an IUC message (e.g., SCI or MAC-CE) indicating a second set of resources and an amount of transmit power reduction for a second side link transmission by the second UE 115-b that the second UE 115-b needs to comply with. The IUC message may indicate that the second UE 115-b will avoid transmitting on the second set of resources unless the second UE 115-b can reduce the transmit power by the indicated transmit power reduction amount. In some examples, the first UE 115-a may determine that a measurement (e.g., RSRP) performed on an SCI received from a third UE 115-c fails to meet a threshold, and the first UE 115-a may send the IUC message based on the measurement failing to meet the threshold. In some examples, the first UE 115-a may determine to send the IUC message to the second UE 115-b based on the second side link transmission being associated with a lower priority than the first side link transmission. In some examples, the second UE 115-b may send and the first UE 115-a may receive a request for an IUC message, and the first UE 115-a may send the IUC message to the second UE 115-b in response to the request.

[0134] In some examples, the first UE 115-a may send a resource set type in the IUC message, which indicates that the second set of resources includes non-preferred resources. In some examples, the first UE 115-a may send an IUC message indicating an indication of a transmit power reduction amount for a second side link transmission performed by the second UE 115-b via the second set of resources that the second UE 115-b needs to comply with. In some examples, the indication of the transmit power reduction amount indicated in the IUC message may be a resource set type in the IUC message. In some examples, the indication of the transmit power reduction amount indicated in the IUC message may be in another field in the IUC message. In some examples, the transmit power reduction amount may be zero or some other value.

[0135] In some examples, the first UE 115-a may send an IUC message with a cyclic shift that indicates a transmit power reduction amount that the second UE 115-b needs to comply with for a second side link transmission performed by the second UE 115-b via a second set of resources. The first UE 115-a may be configured with a set of multiple cyclic shifts. The first cyclic shift in the set of multiple cyclic shifts may indicate that the second UE 115-b will avoid transmitting the second side link transmission via the second set of resources. Each other cyclic shift in the set of multiple cyclic shifts may indicate a different transmit power reduction amount that the second UE 115-b needs to comply with for a second side link transmission performed by the second UE 115-b via the second set of resources.

[0136] In some examples, the IUC message may indicate a first transmit power for use by the second UE 115-b for a second side link transmission by the second UE 115-b via a second set of resources. The first transmit power may correspond to an amount of transmit power reduction for the second side link transmission by the second UE 115-b that the second UE 115-b needs to comply with. For example, the first transmit power may be a transmit power resulting from reducing the second transmit power by an amount of transmit power reduction for the side link transmission by the second UE 115-b via the second set of resources that the second UE 115-b needs to comply with.

[0137] In some examples, the first side link transmission from the third UE 115-c may be for the first UE 115-a. The first UE 115-a may perform a first measurement on the SCI received from the second UE 115-b, a second measurement on the SCI received from the third UE 115-c, or both. The first UE 115-a may send an IUC message to the second UE 115-b based on determining that the first measurement exceeds a first threshold or determining that the difference between the first measurement and the second measurement exceeds a second threshold. The first threshold may be referred to as an absolute interference threshold, and the second threshold may be referred to as a relative interference threshold.

[0138] In some examples, the second side link transmission from the second UE 115-b may be for the first UE 115-a. The first UE 115-a may perform a first measurement on the SCI received from the third UE 115-b, a second measurement on the SCI received from the second UE 115-b, or both. The first UE 115-a may send an IUC message to the second UE 115-b based on determining that the first measurement exceeds a first threshold or determining that the difference between the first measurement and the second measurement results exceeds a second threshold. The first threshold may be referred to as an absolute interference threshold, and the second threshold may be referred to as a relative interference threshold.

[0139] At 525, based on the indicated transmit power reduction amount, the second UE 115-b may transmit a second side link transmission via the second set of resources, and the first UE 115-a may receive the second side link transmission via the second set of resources. For example, the second UE 115-b may reduce the transmit power by the indicated transmit power reduction amount before transmitting the second side link transmission to the first UE 115-a via the second set of resources.

[0140] At 530, the third UE 115-c may transmit a first side link transmission via the first set of resources, and the first UE 115-a may receive the first side link transmission via the first set of resources. Because the second UE 115-b may reduce transmit power by the indicated transmit power reduction amount, interference from the second side link transmission from the second UE 115-b to the first side link transmission from the third UE 115-c may be reduced.

[0141] Figure 6 A block diagram 600 of a device 605 supporting IUC-based transmit power adjustment according to one or more aspects of the present disclosure is shown. The device 605 may be an example of aspects of the UE 115 as described herein. The device 605 may include a receiver 610, a transmitter 615, and a communication manager 620. The device 605 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0142] The receiver 610 may provide means for receiving information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels related to IUC-based transmit power adjustment, data channels, information channels). The information may be communicated to other components of the device 605. The receiver 610 may utilize a single antenna or a set of multiple antennas.

[0143] The transmitter 615 may provide means for transmitting signals generated by other components of the device 605. For example, the transmitter 615 may transmit information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to IUC-based transmit power adjustment). In some examples, the transmitter 615 may be co-located with the receiver 610 in a transceiver module. The transmitter 615 may utilize a single antenna or a set of multiple antennas.

[0144] The communication manager 620, the receiver 610, the transmitter 615, or various combinations thereof, or various components thereof, may be examples of means for performing various aspects of IUC-based transmit power adjustment as described herein. For example, the communication manager 620, the receiver 610, the transmitter 615, or various combinations thereof, or components thereof, may support methods for performing one or more of the functions described herein.

[0145] In some examples, the communication manager 620, the receiver 610, the transmitter 615, or various combinations or components thereof may be implemented in hardware (e.g., in a communication management circuit). The hardware may include a processor, a digital signal processor (DSP), a central processing unit (CPU), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, a microcontroller, discrete gate or transistor logic, discrete hardware components, or any combination thereof that is configured as or otherwise supports components for performing the functions described in the present disclosure. In some examples, the processor and a memory coupled to the processor may be configured to perform one or more of the functions described herein (e.g., by executing instructions stored in the memory by the processor).

[0146] Additionally or alternatively, in some examples, the communication manager 620, the receiver 610, the transmitter 615, or various combinations or components thereof may be implemented in code executed by a processor (e.g., as communication management software or firmware). If implemented in code executed by a processor, the functionality of the communication manager 620, the receiver 610, the transmitter 615, or various combinations or components thereof may be performed by a general purpose processor (e.g., configured as or otherwise supporting components for performing the functions described in the present disclosure), a DSP, a CPU, an ASIC, an FPGA, a microcontroller, or any combination of these or other programmable logic devices.

[0147] In some examples, communication manager 620 may be configured to perform various operations (e.g., receive, obtain, monitor, output, transmit) using or otherwise cooperating with receiver 610, transmitter 615, or both. For example, communication manager 620 may receive information from receiver 610, transmit information to transmitter 615, or be integrated in conjunction with receiver 610, transmitter 615, or both to obtain information, output information, or perform various other operations as described herein.

[0148] According to the examples disclosed herein, the communication manager 620 may support wireless communication at the first UE. For example, the communication manager 620 may be configured to or otherwise support a component for receiving, by the first UE, a first side link control information reserving a first set of resources for a first side link transmission performed by a third UE. The communication manager 620 may be configured to or otherwise support a component for sending an IUC message to a second UE, the IUC message indicating a second set of resources and a transmit power reduction amount for a second side link transmission performed by the second UE via the second set of resources that the second UE needs to comply with, wherein the second set of resources overlaps with the first set of resources. The communication manager 620 may be configured to or otherwise support a component for receiving a second side link transmission from the second UE via the second set of resources or receiving a first side link transmission from the third UE via the first set of resources according to the indicated transmit power reduction amount.

[0149] Additionally or alternatively, according to examples as disclosed herein, the communication manager 620 may support wireless communication at the second UE. For example, the communication manager 620 may be configured to or otherwise support a component for receiving an IUC message from the first UE, the IUC message indicating a second set of resources and a transmit power reduction amount that the second UE needs to comply with for a second side link transmission by the second UE via the second set of resources, wherein the second set of resources overlaps with a first set of resources reserved by the first side link control information for a first side link transmission by a third UE. The communication manager 620 may be configured to or otherwise support a component for transmitting the second side link transmission via the second set of resources according to the indicated transmit power reduction amount.

[0150] By including or configuring a communication manager 620 according to examples as described herein, a device 605 (e.g., a processor controlling or otherwise coupled to a receiver 610, a transmitter 615, a communication manager 620, or a combination thereof) may support techniques for more efficiently utilizing communication resources (e.g., because the described techniques may enable the device 605 or another device to use communication resources that the device 605 or another device would otherwise avoid using).

[0151] Figure 7 A block diagram 700 of a device 705 supporting IUC-based transmit power adjustment according to one or more aspects of the present disclosure is shown. The device 705 may be an example of aspects of the device 605 or UE 115 as described herein. The device 705 may include a receiver 710, a transmitter 715, and a communication manager 720. The device 705 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0152] The receiver 710 may provide means for receiving information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels related to IUC-based transmit power adjustment, data channels, information channels). The information may be communicated to other components of the device 705. The receiver 710 may utilize a single antenna or a set of multiple antennas.

[0153] The transmitter 715 may provide means for transmitting signals generated by other components of the device 705. For example, the transmitter 715 may transmit information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to IUC-based transmit power adjustment). In some examples, the transmitter 715 may be co-located with the receiver 710 in a transceiver module. The transmitter 715 may utilize a single antenna or a set of multiple antennas.

[0154] The device 705 or its various components may be examples of components for performing various aspects of IUC-based transmit power adjustment as described herein. For example, the communication manager 720 may include an SCI manager 725, an IUC message manager 730, a side link manager 735, or any combination thereof. The communication manager 720 may be an example of various aspects of the communication manager 620 as described herein. In some examples, the communication manager 720 or its various components may be configured to use or otherwise cooperate with the receiver 710, the transmitter 715, or both to perform various operations (e.g., receive, obtain, monitor, output, send). For example, the communication manager 720 may receive information from the receiver 710, transmit information to the transmitter 715, or be integrated with the receiver 710, the transmitter 715, or both to obtain information, output information, or perform various other operations as described herein.

[0155] According to examples as disclosed herein, the communication manager 720 may support wireless communications at a first UE. The SCI manager 725 may be configured to or otherwise support a component for receiving, by the first UE, first side link control information reserving a first set of resources for a first side link transmission by a third UE. The IUC message manager 730 may be configured to or otherwise support a component for sending an IUC message to a second UE, the IUC message indicating a second set of resources and a transmit power reduction amount that the second UE needs to comply with for a second side link transmission by the second UE via the second set of resources, wherein the second set of resources overlaps with the first set of resources. The side link manager 735 may be configured to or otherwise support a component for receiving a second side link transmission from the second UE via the second set of resources or receiving a first side link transmission from the third UE via the first set of resources according to the indicated transmit power reduction amount.

[0156] Additionally or alternatively, according to examples as disclosed herein, the communication manager 720 may support wireless communication at the second UE. The IUC message manager 730 may be configured to or otherwise support components for receiving an IUC message from the first UE, the IUC message indicating a second set of resources and a transmit power reduction amount that the second UE needs to comply with for a second side link transmission by the second UE via the second set of resources, wherein the second set of resources overlaps with a first set of resources reserved by the first side link control information for a first side link transmission by a third UE. The side link manager 735 may be configured to or otherwise support components for transmitting the second side link transmission via the second set of resources according to the indicated transmit power reduction amount.

[0157] Figure 8 A block diagram 800 of a communication manager 820 supporting IUC-based transmit power adjustment according to one or more aspects of the present disclosure is shown. The communication manager 820 may be an example of aspects of the communication manager 620, the communication manager 720, or both as described herein. The communication manager 820 or its various components may be examples of components for performing various aspects of IUC-based transmit power adjustment as described herein. For example, the communication manager 820 may include an SCI manager 825, an IUC message manager 830, a side link manager 835, a measurement manager 840, an IUC request manager 845, or any combination thereof. Each of these components may communicate directly or indirectly with each other (e.g., via one or more buses).

[0158] According to examples as disclosed herein, the communication manager 820 may support wireless communications at a first UE. The SCI manager 825 may be configured to or otherwise support a component for receiving, by the first UE, first side link control information reserving a first set of resources for a first side link transmission performed by a third UE. The IUC message manager 830 may be configured to or otherwise support a component for sending an IUC message to a second UE, the IUC message indicating a second set of resources and a transmit power reduction amount that the second UE needs to comply with for a second side link transmission performed by the second UE via the second set of resources, wherein the second set of resources overlaps with the first set of resources. The side link manager 835 may be configured to or otherwise support a component for receiving a second side link transmission from the second UE via the second set of resources according to the indicated transmit power reduction amount or receiving a first side link transmission from the third UE via the first set of resources.

[0159] In some examples, to support sending the IUC message, the IUC message manager 830 may be configured or otherwise support components for sending a resource set type in the IUC message indicating that the second set of resources includes non-preferred resources.

[0160] In some examples, to support sending an IUC message, the IUC message manager 830 may be configured or otherwise support components for sending an IUC message indicating an amount of transmit power reduction for a second sidelink transmission by the second UE via a second set of resources that the second UE needs to comply with.

[0161] In some examples, the IUC message includes second sidelink control information or a medium access control control element.

[0162] In some examples, the measurement manager 840 may be configured to or otherwise support components for determining that measurements performed on first sidelink control information from a third UE failed to meet a threshold, wherein sending an IUC message to the second UE is based on the measurements failing to meet the threshold.

[0163] In some examples, to support sending an IUC message, the IUC message manager 830 may be configured to or otherwise support components for sending an IUC message with a cyclic shift that indicates an amount of transmit power reduction that the second UE needs to comply with for a second side link transmission by the second UE via a second set of resources.

[0164] In some examples, a first UE is configured with a set of multiple cyclic shifts, and a first cyclic shift in the set of multiple cyclic shifts indicates that the second UE is to avoid transmitting a second side link transmission via a second set of resources, and each other cyclic shift in the set of multiple cyclic shifts indicates a different transmit power reduction amount that the second UE needs to comply with for the second side link transmission by the second UE via the second set of resources.

[0165] In some examples, the IUC message manager 830 may be configured or otherwise support components for determining to send the IUC message to the second UE based on the second sidelink transmission being associated with a lower priority than the first sidelink transmission.

[0166] In some examples, the SCI manager 825 may be configured or otherwise support components for receiving, by the first UE, signaling to reserve a second set of resources for a second sidelink transmission by the second UE.

[0167] In some examples, the first sidelink transmission from the third UE is to the first UE, and the measurement manager 840 may be configured to or otherwise support a component for determining that a first measurement performed on the signaling exceeds a first threshold or a difference between the first measurement and a second measurement performed on the first sidelink control information exceeds a second threshold, wherein sending the IUC message to the second UE is based on the determination.

[0168] In some examples, the second sidelink transmission from the second UE is to the first UE, and the measurement manager 840 may be configured to or otherwise support a component for determining that a first measurement performed on the first sidelink control information exceeds a first threshold or a difference between the first measurement and a second measurement performed on the signaling exceeds a second threshold, wherein sending the IUC message to the second UE is based on the determination.

[0169] Additionally or alternatively, according to examples as disclosed herein, the communication manager 820 may support wireless communication at the second UE. In some examples, the IUC message manager 830 may be configured to or otherwise support components for receiving an IUC message from the first UE, the IUC message indicating a second set of resources and a transmit power reduction amount that the second UE needs to comply with for a second side link transmission by the second UE via the second set of resources, wherein the second set of resources overlaps with a first set of resources reserved by the first side link control information for a first side link transmission by a third UE. In some examples, the side link manager 835 may be configured to or otherwise support components for transmitting the second side link transmission via the second set of resources according to the indicated transmit power reduction amount.

[0170] In some examples, to support receiving an IUC message, the IUC message manager 830 may be configured or otherwise support components for receiving a resource set type in the IUC message indicating that the second set of resources includes non-preferred resources.

[0171] In some examples, to support receiving an IUC message, the IUC message manager 830 may be configured or otherwise support components for receiving an IUC message indicating an amount of transmit power reduction for a second sidelink transmission by the second UE via a second set of resources that the second UE needs to comply with.

[0172] In some examples, the IUC request manager 845 may be configured or otherwise support components for sending a request for an IUC message to the first UE, where receiving the IUC message from the first UE is based on sending the request.

[0173] In some examples, the IUC message includes second sidelink control information or a medium access control control element.

[0174] In some examples, to support receiving an IUC message, the IUC message manager 830 may be configured to or otherwise support components for receiving an IUC message with a cyclic shift indicating an amount of transmit power reduction that the second UE needs to comply with for a second sidelink transmission by the second UE via a second set of resources.

[0175] In some examples, the second side link transmission is associated with a lower priority than the first side link transmission.In some examples, receiving the IUC message is based on the second side link transmission being associated with a lower priority than the first side link transmission.

[0176] In some examples, the SCI manager 825 may be configured or otherwise support components for sending signaling to reserve a second set of resources for a second sidelink transmission by a second UE.

[0177] Fig. 9 A diagram of a system 900 including a device 905 that supports IUC-based transmit power adjustment according to one or more aspects of the present disclosure is shown. The device 905 may be an example of a device 605, a device 705, or a UE 115 as described herein, or include components thereof. The device 905 may communicate (e.g., wirelessly) with one or more network entities 105, one or more UEs 115, or any combination thereof. The device 905 may include components for two-way voice and data communications, including components for sending and receiving communications, such as a communication manager 920, an input / output (I / O) controller 910, a transceiver 915, an antenna 925, a memory 930, a code 935, and a processor 940. These components may be electronically communicated or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more buses (e.g., bus 945).

[0178] I / O controller 910 can manage input and output signals of device 905. I / O controller 910 can also manage peripheral devices that are not integrated into device 905. In some cases, I / O controller 910 can represent a physical connection or port to an external peripheral device. In some cases, I / O controller 910 can utilize an operating system, such as iOS. ® ANDROID ® , MS-DOS ® 、MS-WINDOWS ® , OS / 2 ® ,UNIX ® 、LINUX ® or another known operating system. Additionally or alternatively, I / O controller 910 may represent or interact with a modem, keyboard, mouse, touch screen, or similar device. In some cases, I / O controller 910 may be implemented as part of a processor (such as processor 940). In some cases, a user may interact with device 905 via I / O controller 910 or via hardware components controlled by I / O controller 910.

[0179] In some cases, the device 905 may include a single antenna 925. However, in some other cases, the device 905 may have more than one antenna 925, which may be capable of concurrently transmitting or receiving multiple wireless transmissions. The transceiver 915 may communicate bidirectionally via one or more antennas 925, wired or wireless links as described herein. For example, the transceiver 915 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 915 may also include a modem for: modulating packets; providing the modulated packets to one or more antennas 925 for transmission; and demodulating packets received from one or more antennas 925. The transceiver 915 or the transceiver 915 and one or more antennas 925 may be examples of transmitters 615, transmitters 715, receivers 610, receivers 710, or any combination thereof or components thereof as described herein.

[0180] The memory 930 may include random access memory (RAM) and read-only memory (ROM). The memory 930 may store computer-readable, computer-executable code 935 including instructions that, when executed by the processor 940, cause the device 905 to perform various functions described herein. The code 935 may be stored in a non-transitory computer-readable medium such as a system memory or another type of memory. In some cases, the code 935 may not be directly executable by the processor 940, but may (for example, when compiled and executed) cause the computer to perform the functions described herein. In some cases, the memory 930 may also include, among other things, a basic I / O system (BIOS) that may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0181] The processor 940 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, the processor 940 may be configured to operate a memory array using a memory controller. In some other cases, the memory controller may be integrated into the processor 940. The processor 940 may be configured to execute computer-readable instructions stored in a memory (e.g., a memory 930) to enable the device 905 to perform various functions (e.g., functions or tasks that support IUC-based transmit power adjustment). For example, the device 905 or a component of the device 905 may include a processor 940 and a memory 930 coupled to or coupled to the processor 940, and the processor 940 and the memory 930 are configured to perform the various functions described herein.

[0182] According to the examples disclosed herein, the communication manager 920 may support wireless communication at the first UE. For example, the communication manager 920 may be configured to or otherwise support a component for receiving, by the first UE, a first side link control information reserving a first set of resources for a first side link transmission performed by a third UE. The communication manager 920 may be configured to or otherwise support a component for sending an IUC message to a second UE, the IUC message indicating a second set of resources and a transmit power reduction amount for a second side link transmission performed by the second UE via the second set of resources that the second UE needs to comply with, wherein the second set of resources overlaps with the first set of resources. The communication manager 920 may be configured to or otherwise support a component for receiving a second side link transmission from the second UE via the second set of resources or receiving a first side link transmission from the third UE via the first set of resources according to the indicated transmit power reduction amount.

[0183] Additionally or alternatively, according to examples as disclosed herein, the communication manager 920 may support wireless communication at the second UE. For example, the communication manager 920 may be configured to or otherwise support a component for receiving an IUC message from the first UE, the IUC message indicating a second set of resources and a transmit power reduction amount that the second UE needs to comply with for a second side link transmission by the second UE via the second set of resources, wherein the second set of resources overlaps with a first set of resources reserved by the first side link control information for a first side link transmission by a third UE. The communication manager 920 may be configured to or otherwise support a component for transmitting the second side link transmission via the second set of resources according to the indicated transmit power reduction amount.

[0184] By including or configuring a communication manager 920 according to examples as described herein, the device 905 can support techniques for more efficiently utilizing communication resources (e.g., because the described techniques can enable the device 905 or another device to use communication resources that the device 905 or another device would otherwise avoid using).

[0185] In some examples, the communication manager 920 may be configured to perform various operations (e.g., receive, monitor, transmit) using or otherwise cooperating with the transceiver 915, one or more antennas 925, or any combination thereof. For example, the communication manager 920 may be configured to receive or transmit messages or other signaling as described herein via the transceiver 915. Although the communication manager 920 is illustrated as a separate component, in some examples, one or more functions described with reference to the communication manager 920 may be supported or executed by the processor 940, the memory 930, the code 935, or any combination thereof. For example, the code 935 may include instructions that can be executed by the processor 940 to cause the device 905 to perform various aspects of the IUC-based transmit power adjustment as described herein, or the processor 940 and the memory 930 may be otherwise configured to perform or support such operations.

[0186] Fig.10 A flowchart illustrating a method 1000 for supporting IUC-based transmit power adjustment according to one or more aspects of the present disclosure is shown. The operations of the method 1000 may be implemented by a UE or a component thereof as described herein. For example, the operations of the method 1000 may be implemented by a UE or a component thereof as described in reference to Figures 1 to 9 The UE 115 described herein performs. In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the described functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the described functions.

[0187] At 1005, the method may include: receiving, by the first UE, first sidelink control information that reserves a first set of resources for a first sidelink transmission by a third UE. The operations of 1005 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1005 may be performed as described in reference to Figure 8 Additionally or alternatively, means for performing 1005 may, but need not necessarily include, for example, antenna 925, transceiver 915, communication manager 920, memory 930 (including code 935), processor 940, and / or bus 945.

[0188] At 1010, the method may include: a component for sending an IUC message to a second UE, the IUC message indicating a second set of resources and a transmit power reduction amount for a second sidelink transmission by the second UE via the second set of resources that the second UE needs to comply with, wherein the second set of resources overlaps with the first set of resources. The operations of 1010 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1010 may be performed as described in reference to Figure 8Additionally or alternatively, means for performing 1005 may, but need not necessarily include, for example, an antenna 925, a transceiver 915, a communication manager 920, a memory 930 (including code 935), a processor 940, and / or a bus 945.

[0189] At 1015, the method may include: receiving a second sidelink transmission from a second UE via a second set of resources according to the indicated transmit power reduction amount, or receiving a first sidelink transmission from a third UE via a first set of resources. The operations of 1015 may be performed according to examples disclosed herein. In some examples, aspects of the operations of 1015 may be performed as described in reference to Figure 8 Additionally or alternatively, the components for performing 1005 may, but need not necessarily include, for example, an antenna 925, a transceiver 915, a communication manager 920, a memory 930 (including code 935), a processor 940, and / or a bus 945.

[0190] Fig.11 A flowchart illustrating a method 1100 for supporting IUC-based transmit power adjustment according to one or more aspects of the present disclosure is shown. The operations of the method 1100 may be implemented by a UE or a component thereof as described herein. For example, the operations of the method 1100 may be implemented by a UE or a component thereof as described in reference to Figures 1 to 9 The UE 115 described herein performs. In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the described functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the described functions.

[0191] At 1105, the method may include: receiving an IUC message from the first UE, the IUC message indicating a second set of resources and a transmit power reduction amount that the second UE needs to comply with for a second sidelink transmission by the second UE via the second set of resources, wherein the second set of resources overlaps with a second set of resources reserved by the first sidelink control information for a first sidelink transmission by a third UE. The operations of 1105 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1105 may be performed as described in reference to Figure 8 Additionally or alternatively, means for performing 1005 may, but need not necessarily include, for example, an antenna 925, a transceiver 915, a communication manager 920, a memory 930 (including code 935), a processor 940, and / or a bus 945.

[0192] At 1110, the method may include: transmitting a second side link transmission via a second set of resources according to the indicated transmit power reduction amount. The operations of 1110 may be performed according to examples disclosed herein. In some examples, aspects of the operations of 1110 may be performed as described in reference to Figure 8 Additionally or alternatively, the components for performing 1005 may, but need not necessarily include, for example, an antenna 925, a transceiver 915, a communication manager 920, a memory 930 (including code 935), a processor 940, and / or a bus 945.

[0193] The following provides an overview of various aspects of the disclosure:

[0194] Aspect 1: A method for performing wireless communication at a first UE, the method comprising: receiving first side link control information by the first UE, the first side link control information reserving a first group of resources for a first side link transmission performed by a third UE; sending an inter-UE coordination message to a second UE, the inter-UE coordination message indicating a second group of resources and an amount of transmit power reduction that the second UE needs to comply with for a second side link transmission performed by the second UE via the second group of resources, wherein the second group of resources overlaps with the first group of resources; and receiving the second side link transmission from the second UE via the second group of resources according to the indicated transmit power reduction amount, or receiving the first side link transmission from the third UE via the first group of resources.

[0195] Aspect 2: According to the method according to aspect 1, sending the inter-UE coordination message includes: sending a resource set type in the inter-UE coordination message, and the resource set type indicates that the second group of resources includes non-preferred resources.

[0196] Aspect 3: A method according to any one of Aspects 1 to 2, wherein sending the inter-UE coordination message comprises: sending the inter-UE coordination message to indicate the amount of transmission power reduction that the second UE needs to comply with for the second side link transmission performed by the second UE via the second set of resources.

[0197] Aspect 4: The method according to any one of aspects 1 to 3, wherein the inter-UE coordination message includes second sidelink control information or a medium access control control element.

[0198] Aspect 5: According to the method described in any one of Aspects 1 to 4, the method also includes: determining that the measurement performed on the first sidelink control information from the third UE fails to meet a threshold, wherein sending the inter-UE coordination message to the second UE is at least partly based on the failure of the measurement to meet the threshold.

[0199] Aspect 6: A method according to any one of Aspects 1 to 5, wherein sending the inter-UE coordination message comprises: sending the inter-UE coordination message with a cyclic shift, wherein the cyclic shift indicates the transmit power reduction amount that the second UE needs to comply with for the second side link transmission performed by the second UE via the second set of resources.

[0200] Aspect 7: A method according to any one of Aspects 1 to 6, wherein the first UE is configured with multiple cyclic shifts, and a first cyclic shift among the multiple cyclic shifts indicates that the second UE will avoid sending the second side link transmission via the second set of resources, and each other cyclic shift among the multiple cyclic shifts indicates a different transmission power reduction amount for the second side link transmission performed by the second UE via the second set of resources that the second UE needs to comply with.

[0201] Aspect 8: According to any one of Aspects 1 to 7, the method also includes: determining to send the inter-UE coordination message to the second UE at least in part based on the second sidelink transmission being associated with a lower priority than the first sidelink transmission.

[0202] Aspect 9: According to the method according to any one of Aspects 1 to 8, the method also includes: receiving, by the first UE, signaling for reserving the second set of resources for the second sidelink transmission performed by the second UE.

[0203] Aspect 10: A method according to Aspect 9, wherein the first sidelink transmission from the third UE is directed to the first UE, and the method further includes: determining that a first measurement performed on the signaling exceeds a first threshold or a difference between the first measurement and a second measurement performed on the first sidelink control information exceeds a second threshold, wherein sending the inter-UE coordination message to the second UE is at least partially based on the determination.

[0204] Aspect 11: A method according to any one of Aspects 9 to 10, wherein the second sidelink transmission from the second UE is directed to the first UE, and the method further includes: determining that a first measurement performed on the first sidelink control information exceeds a first threshold or a difference between the first measurement and a second measurement performed on the signaling exceeds a second threshold, wherein sending the inter-UE coordination message to the second UE is at least partially based on the determination.

[0205] Aspect 12: A method for performing wireless communications at a second UE, the method comprising: receiving an inter-UE coordination message from a first UE, the inter-UE coordination message indicating a second set of resources and an amount of transmit power reduction that the second UE needs to comply with for a second side link transmission by the second UE via the second set of resources, wherein the second set of resources overlaps with a first set of resources reserved by first side link control information for a first side link transmission by a third UE; and sending the second side link transmission via the second set of resources according to the indicated transmit power reduction amount.

[0206] Aspect 13: The method according to aspect 12, wherein receiving the inter-UE coordination message includes: receiving a resource set type in the inter-UE coordination message, the resource set type indicating that the second set of resources includes non-preferred resources.

[0207] Aspect 14: A method according to any one of Aspects 12 to 13, wherein receiving the inter-UE coordination message includes: receiving an indication of the amount of transmission power reduction that the second UE needs to comply with for the second side link transmission performed by the second UE via the second set of resources.

[0208] Aspect 15: According to any one of aspects 12 to 14, the method also includes: sending a request for the inter-UE coordination message to the first UE, wherein receiving the inter-UE coordination message from the first UE is at least partly based on sending the request.

[0209] Aspect 16: The method according to any one of aspects 12 to 15, wherein the inter-UE coordination message includes second sidelink control information or a medium access control control element.

[0210] Aspect 17: A method according to any one of Aspects 12 to 16, wherein receiving the inter-UE coordination message includes: receiving the inter-UE coordination message with a cyclic shift, wherein the cyclic shift indicates the transmit power reduction amount that the second UE needs to comply with for the second side link transmission performed by the second UE via the second set of resources.

[0211] Aspect 18: A method according to any one of Aspects 12 to 17, wherein the second side link transmission is associated with a lower priority than the first side link transmission, and receiving the inter-UE coordination message is at least partially based on the second side link transmission being associated with a lower priority than the first side link transmission.

[0212] Aspect 19: According to the method according to any one of Aspects 12 to 18, the method also includes: sending signaling to reserve the second set of resources for the second sidelink transmission performed by the second UE.

[0213] Aspect 20: An apparatus comprising a memory, a transceiver, and at least one processor of a first UE, the at least one processor being coupled to the memory and the transceiver, and the at least one processor being configured to perform a method according to any one of aspects 1 to 11.

[0214] Aspect 21: An apparatus for wireless communication at a first UE, the apparatus comprising: at least one component for performing the method according to any one of aspects 1 to 11.

[0215] Aspect 22: 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 11.

[0216] Aspect 23: An apparatus comprising a memory, a transceiver, and at least one processor of a second UE, the at least one processor being coupled to the memory and the transceiver, and the at least one processor being configured to perform a method according to any one of aspects 12 to 19.

[0217] Aspect 24: An apparatus for wireless communication at a second UE, the apparatus comprising: at least one component for performing a method according to any one of aspects 12 to 19.

[0218] Aspect 25: A non-transitory computer-readable medium storing code for wireless communication at a second UE, the code comprising instructions executable by a processor to perform the method according to any one of aspects 12 to 19.

[0219] It should be noted that the methods described herein describe possible implementations, and that the various operations and steps may be rearranged or otherwise modified and that other implementations are possible. Furthermore, aspects from two or more methods may be combined in a method.

[0220] Although aspects of an LTE, LTE-A, LTE-A Pro, or NR system may be described for example purposes, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein may also be applicable to networks other than LTE, LTE-A, LTE-A Pro, or NR networks. For example, the described techniques 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.

[0221] The information and signals described herein may be represented using any of a variety of different technologies and methods. For example, data, instructions, commands, information, signals, bits, symbols, and chips mentioned throughout the specification may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or optical particles, or any combination thereof.

[0222] The various illustrative blocks and components described in conjunction with the disclosure herein may be implemented or executed using a general purpose processor, DSP, ASIC, CPU, FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in an alternative, the processor may be any processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration).

[0223] The functions described herein may be implemented using hardware, software executed by a processor, firmware, or any combination thereof. When implemented using software executed by a processor, the functions may be stored as one or more instructions or codes of a computer-readable medium or sent using one or more instructions or codes of a computer-readable medium. Other examples and specific 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, hard wiring, or a combination of any of these items. Features that implement the functions may also be physically located at different locations, including being distributed so that the functions are implemented at different physical locations.

[0224] Computer-readable media include both non-transient computer storage media and communication media, including any media that facilitates the transfer of computer programs from one location to another. Non-transient storage media can be any available media that can be accessed by a general or special computer. By way of example and not limitation, non-transient computer-readable media may include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, compact disc (CD) ROM or other optical disc storage devices, magnetic disk storage devices or other magnetic storage devices, or can be used to carry or store desired program code components in the form of instructions or data structures and any other non-transient media that can be accessed by a general or special computer or a general or special processor. Moreover, any connection is appropriately referred to as a computer-readable medium. For example, if the software is sent from a website, server or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) or wireless technologies such as infrared, radio and microwaves, coaxial cable, fiber optic cable, twisted pair, DSL or wireless technologies such as infrared, radio and microwaves are included in the definition of computer-readable media. Disks and optical disks as used herein include CDs, laser discs, optical discs, digital versatile discs (DVDs), floppy disks, and Blu-ray discs. Disks can reproduce data magnetically, and optical disks can reproduce data optically using lasers. Combinations of the above are also included within the scope of computer-readable media.

[0225] As used herein (including in the claims), "or" used in a list of items (e.g., a list of items followed by a phrase such as "at least one of" or "one or more of") indicates an inclusive list, so that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). Moreover, as used herein, the phrase "based on" should not be interpreted as a reference to a closed set of conditions. For example, an example step described as "based on condition A" can be based on both condition A and condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "based at least in part on".

[0226] The term "determining" encompasses a variety of actions, and thus, "determining" may include calculating, computing, processing, deriving, investigating, looking up (such as via looking up in a table, database or other data structure), ascertaining, and the like. Furthermore, "determining" may include receiving (e.g., receiving information), accessing (e.g., accessing data stored in a memory), etc. Furthermore, "determining" may include parsing, obtaining, selecting, choosing, establishing, and other such similar actions.

[0227] In the drawings, similar components or features may have the same reference label. In addition, various components of the same type may be distinguished by following the reference label with a dash and a second label to distinguish between the similar components. If only the first reference label is used in the specification, the description may apply to any of the similar components having the same first reference label, regardless of the second reference label or other subsequent reference labels.

[0228] The descriptions set forth herein in conjunction with the accompanying drawings describe example configurations and do not represent all examples that may be implemented or within the scope of the claims. The term "example" as used herein means "used as an example, instance, or illustration," rather than "preferred" or "advantageous over other examples." The specific embodiments include specific details to provide an understanding of the described techniques. However, these techniques may be practiced without these specific details. In some cases, known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described examples.

[0229] The description herein is provided to enable one of ordinary skill in the art to implement or use the present disclosure. Various modifications to the present disclosure will be apparent to one of ordinary skill in the art, and the general principles defined herein may be applied to other variations without departing from the scope of the present disclosure. Thus, the present disclosure is not limited to the examples and designs described herein, but should be granted the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication at a first user equipment (UE), the method comprising: receiving, by the first UE, first sidelink control information, the first sidelink control information reserving a first set of resources for a first sidelink transmission performed by a third UE; as well as An inter-UE coordination message is sent to a second UE, the inter-UE coordination message indicating a second set of resources and a transmit power reduction amount that the second UE needs to comply with for a second sidelink transmission by the second UE via the second set of resources, wherein the second set of resources overlaps with the first set of resources.

2. The method according to claim 1, wherein sending the inter-UE coordination message comprises: A resource set type is sent in the inter-UE coordination message, the resource set type indicating that the second set of resources includes non-preferred resources.

3. The method of claim 1 , wherein sending the inter-UE coordination message comprises: The inter-UE coordination message is sent to indicate the transmit power reduction amount that the second UE needs to comply with for the second sidelink transmission by the second UE via the second set of resources. 4 . The method of claim 1 , wherein the inter-UE coordination message comprises second sidelink control information or a medium access control control element.

5. The method according to claim 1, further comprising: A determination is made that measurements performed on the first sidelink control information from the third UE fail to satisfy a threshold, wherein sending the inter-UE coordination message to the second UE is based at least in part on the measurements failing to satisfy the threshold.

6. The method of claim 1, wherein sending the inter-UE coordination message comprises: The inter-UE coordination message is sent with a cyclic shift indicating the transmit power reduction amount that the second UE needs to comply with for the second sidelink transmission by the second UE via the second set of resources.

7. A method according to claim 1, wherein the first UE is configured with multiple cyclic shifts, and a first cyclic shift in the multiple cyclic shifts indicates that the second UE will avoid sending the second sidelink transmission via the second set of resources, and each other cyclic shift in the multiple cyclic shifts indicates a different transmission power reduction amount for the second sidelink transmission performed by the second UE via the second set of resources that the second UE needs to comply with.

8. The method according to claim 1, further comprising: The determination to transmit the inter-UE coordination message to the second UE is based at least in part on the second sidelink transmission being associated with a lower priority than the first sidelink transmission.

9. The method according to claim 1, further comprising: Signaling reserving the second set of resources for the second sidelink transmission by the second UE is received by the first UE.

10. The method of claim 9, wherein the first sidelink transmission from the third UE is for the first UE, the method further comprising: Determining that a first measurement performed on the signaling exceeds a first threshold or a difference between the first measurement and a second measurement performed on the first sidelink control information exceeds a second threshold, wherein sending the inter-UE coordination message to the second UE is at least partially based on the determination.

11. The method of claim 9, wherein the second sidelink transmission from the second UE is for the first UE, the method further comprising: Determining that a first measurement performed on the first sidelink control information exceeds a first threshold or a difference between the first measurement and a second measurement performed on the signaling exceeds a second threshold, wherein sending the inter-UE coordination message to the second UE is based at least in part on the determination.

12. A method for wireless communication at a second user equipment (UE), the method comprising: receiving an inter-UE coordination message from a first UE, the inter-UE coordination message indicating a second set of resources and an amount of transmit power reduction that the second UE needs to comply with for second sidelink transmissions by the second UE via the second set of resources, wherein the second set of resources overlaps with a first set of resources reserved by the first sidelink control information for first sidelink transmissions by a third UE; as well as The second sidelink transmission is transmitted via the second set of resources according to the indicated transmit power reduction amount.

13. The method of claim 12, wherein receiving the inter-UE coordination message comprises: A resource set type is received in the inter-UE coordination message, the resource set type indicating that the second set of resources includes non-preferred resources.

14. The method of claim 12, wherein receiving the inter-UE coordination message comprises: receiving an indication of the transmit power reduction amount that the second UE needs to comply with in the inter-UE coordination message for the second sidelink transmission by the second UE via the second set of resources.

15. The method according to claim 12, further comprising: A request for the inter-UE coordination message is sent to the first UE, wherein receiving the inter-UE coordination message from the first UE is based at least in part on sending the request.

16. The method of claim 12, wherein the inter-UE coordination message comprises second sidelink control information or a medium access control control element.

17. The method of claim 12, wherein receiving the inter-UE coordination message comprises: The inter-UE coordination message is received with a cyclic shift indicating the transmit power reduction amount that the second UE needs to comply with for the second sidelink transmission by the second UE via the second set of resources.

18. The method of claim 12, wherein receiving the inter-UE coordination message is based at least in part on the second sidelink transmission being associated with a lower priority than the first sidelink transmission.

19. The method according to claim 12, further comprising: Send signaling to reserve the second set of resources for the second sidelink transmission by the second UE.

20. An apparatus for wireless communication, the apparatus comprising: Memory; Transceiver; and At least one processor of a first user equipment (UE), the at least one processor coupled to the memory and the transceiver, and the at least one processor configured to: receiving, by the first UE via the transceiver, first sidelink control information, the first sidelink control information reserving a first set of resources for a first sidelink transmission by a third UE; as well as An inter-UE coordination message is sent via the transceiver to a second UE, the inter-UE coordination message indicating a second set of resources and an amount of transmit power reduction that the second UE needs to comply with for a second side link transmission by the second UE via the second set of resources, wherein the second set of resources overlaps with the first set of resources.

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