Techniques for channel access awareness collision determination for unlicensed sidelink bands

Abstract

Methods, systems, and devices for wireless communication are described. A first user equipment (UE) may be configured to receive, from a second UE, a first sidelink control message indicating a first reserved resource to be used by the second UE for sidelink communications in a shared radio frequency spectrum band. The first UE may additionally receive, from a third UE, a second sidelink control message indicating a second reserved resource to be used by the third UE for sidelink communications in the shared radio frequency spectrum band. The first UE may transmit an indication of a conflict between the first reserved resource and the second reserved resource based on a time and frequency overlap of the first reserved resource and the second reserved resource, a signal strength of a signal received from the second UE, the third UE, or both, and a channel access parameter for communicating with the second UE, the third UE, or both.

Description

Technical Field

[0001] The following relates to wireless communications, including techniques for channel access aware conflict determination for an unlicensed sidelink band. Background Art

[0002] 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). A wireless multiple access communication system may include one or more base stations, each of which supports wireless communication for a communication device, which may be referred to as a user equipment (UE).

[0003] In some wireless communications, each wireless device (e.g., UE) may be able to communicate with each other directly using sidelink communications. Different mechanisms may be used to reduce interference in the sidelink frequency band. In some cases, each UE may exchange inter-UE coordination messages to reserve resources for sidelink communications. In other cases, each UE may perform a listen-before-talk (LBT) process to reduce interference. However, current techniques for reducing interference in the sidelink frequency band may still generate interference. Summary of the invention

[0004] The described technology relates to improved methods, systems, devices and apparatuses for supporting technologies for channel access-aware conflict determination for unlicensed side link bands. In general, the described technology provides configurations and conditions that enable each user equipment (UE) to determine whether there is a conflict between reserved resources in an unlicensed side link band based on one or more channel access parameters. In some cases, the channel access parameters can be used to determine the relative probability that a listen-before-talk (LBT) process between each reserved UE will not successfully resolve the conflict between overlapping reserved resources. Thus, the technology described herein can enable a third-party UE (e.g., a non-reserved UE) to identify overlapping resources reserved by other UEs (e.g., reserved UEs) and determine that the LBT process is unlikely to resolve the identified conflict. In such cases, the third-party UE (e.g., a non-reserved UE) may send an indication of the conflict to at least one of the reserved UEs to instruct the reserved UE to reselect new resources, thereby avoiding the conflict.

[0005] A method for wireless communication at a first UE is described. The method may include: receiving a first sidelink control message from a second UE indicating a first reserved resource to be used by the second UE for sidelink communication in a shared radio frequency spectrum band; receiving a second sidelink control message from a third UE indicating a second reserved resource to be used by the third UE for sidelink communication in the shared radio frequency spectrum band; and sending an indication of a conflict between the first reserved resource indicated by the first sidelink control message and the second reserved resource indicated by the second sidelink control message based at least in part on the overlap of the first reserved resource with the second reserved resource in time and frequency, the signal strength of a signal received from the second UE, the third UE, or both, and at least one channel access parameter for communicating with the second UE, the third UE, or both.

[0006] An apparatus for wireless communication at a first UE is described. The apparatus may include: a processor; a memory coupled to the processor; and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to: receive a first side link control message from a second UE indicating a first reserved resource to be used by the second UE for side link communication in a shared radio frequency spectrum band; receive a second side link control message from a third UE indicating a second reserved resource to be used by the third UE for side link communication in the shared radio frequency spectrum band; and send an indication of a conflict between the first reserved resource indicated by the first side link control message and the second reserved resource indicated by the second side link control message based at least in part on the overlap of the first reserved resource with the second reserved resource in time and frequency, the signal strength of the signal received from the second UE, the third UE, or both, and at least one channel access parameter for communicating with the second UE, the third UE, or both.

[0007] Another apparatus for wireless communication at a first UE is described. The apparatus may include: a component for receiving a first sidelink control message from a second UE indicating a first reserved resource to be used by the second UE for sidelink communication in a shared radio frequency spectrum band; a component for receiving a second sidelink control message from a third UE indicating a second reserved resource to be used by the third UE for sidelink communication in the shared radio frequency spectrum band; and a component for sending an indication of a conflict between the first reserved resource indicated by the first sidelink control message and the second reserved resource indicated by the second sidelink control message based at least in part on the overlap of the first reserved resource with the second reserved resource in time and frequency, the signal strength of a signal received from the second UE, the third UE, or both, and at least one channel access parameter for communicating with the second UE, the third UE, or both.

[0008] A non-transitory computer-readable medium storing code for wireless communication at a first UE is described. The code may include instructions that can be executed by a processor to: receive a first sidelink control message from a second UE indicating a first reserved resource to be used by the second UE for sidelink communication in a shared radio frequency spectrum band; receive a second sidelink control message from a third UE indicating a second reserved resource to be used by the third UE for sidelink communication in the shared radio frequency spectrum band; and send an indication of a conflict between the first reserved resource indicated by the first sidelink control message and the second reserved resource indicated by the second sidelink control message based at least in part on the overlap of the first reserved resource with the second reserved resource in time and frequency, the signal strength of a signal received from the second UE, the third UE, or both, and at least one channel access parameter for communicating with the second UE, the third UE, or both.

[0009] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for determining the presence of the conflict based on the first reserved resources being within a first channel occupancy time (COT) associated with, shared with, or both the second UE and based on the second reserved resources being within a second COT associated with, shared with, or both the third UE, wherein the at least one channel access parameter includes a COT parameter.

[0010] 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 the conflict exists based on a first channel access type associated with the first reserved resource being the same channel access type as a second channel access type associated with the second reserved resource, wherein the at least one channel access parameter includes a channel access type parameter.

[0011] 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 the conflict exists based on a first cyclic prefix extension (CPE) associated with the first reserved resources being the same CPE as a second CPE associated with the second reserved resources, wherein the at least one channel access parameter includes a CPE parameter.

[0012] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for determining the presence of the conflict based on the first reserved resources being within a first COT associated with, shared with, or both the second UE and based on the second reserved resources being within a second COT associated with, shared with, or both the third UE and based on the first CPE associated with the first reserved resources being the same CPE as the second CPE associated with the second reserved resources, wherein the at least one channel access parameter includes a COT parameter and a CPE parameter.

[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 the presence of the conflict based on a first channel access type associated with the first reserved resource being the same channel access type as a second channel access type associated with the second reserved resource and based on a first CPE associated with the first reserved resource being the same CPE as a second CPE associated with the second reserved resource, wherein the at least one channel access parameter includes a channel access type parameter and a CPE parameter.

[0014] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for determining the presence of the conflict based on the number of conflicting resources satisfying a quantity threshold, wherein the number of conflicting resources can be identified based on whether a signal strength of a signal received on each corresponding resource in a set of multiple resources coordinated by the first UE for a set of multiple UEs satisfies a signal strength threshold.

[0015] 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 the conflict between the first reserved resources and the second reserved resources exists based on a first signal strength associated with a first signal received from the second UE satisfying a signal strength threshold.

[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 that the conflict between the first reserved resources and the second reserved resources exists based on a difference between the first signal strength associated with the first signal received from the second UE and the second signal strength associated with the second signal received from the third UE satisfying a signal strength difference threshold.

[0017] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for: sending the indication of the conflict to the second UE based on that the first transmission indicated by the first sidelink control message of the second UE has a lower priority than the second transmission indicated by the second sidelink control message of the third UE.

[0018] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for: receiving, in response to the indication of the conflict, a third side link control message from the second UE identifying third reserved resources different from the first reserved resources to be used by the second UE for side link communications.

[0019] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for: receiving capability signaling from the second UE via a sidelink control information (SCI) message indicating that the second UE is capable of receiving the indication of the conflict; and sending the indication of the conflict to the second UE via a physical sidelink feedback channel based on receiving the capability signaling. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 An example of a wireless communication system supporting techniques for channel access aware conflict determination for an unlicensed sidelink band in accordance with one or more aspects of the present disclosure is illustrated.

[0021] Figure 2 An example of a wireless communication system supporting techniques for channel access aware conflict determination for an unlicensed sidelink band in accordance with one or more aspects of the present disclosure is illustrated.

[0022] Figure 3An example of resource configuration that supports techniques for channel access aware conflict determination for an unlicensed sidelink band in accordance with one or more aspects of the present disclosure is illustrated.

[0023] Figure 4 An example of resource configuration that supports techniques for channel access aware conflict determination for an unlicensed sidelink band in accordance with one or more aspects of the present disclosure is illustrated.

[0024] Figure 5 An example of resource configuration that supports techniques for channel access aware conflict determination for an unlicensed sidelink band in accordance with one or more aspects of the present disclosure is illustrated.

[0025] Figure 6 An example of resource configuration that supports techniques for channel access aware conflict determination for an unlicensed sidelink band in accordance with one or more aspects of the present disclosure is illustrated.

[0026] Figure 7 An example of resource configuration that supports techniques for channel access aware conflict determination for an unlicensed sidelink band in accordance with one or more aspects of the present disclosure is illustrated.

[0027] Figure 8 An example of a process flow for techniques supporting channel access aware conflict determination for an unlicensed sidelink band in accordance with one or more aspects of the present disclosure is illustrated.

[0028] Fig. 9 and Fig.10 A block diagram of a device supporting techniques for channel access aware conflict determination for an unlicensed sidelink band in accordance with one or more aspects of the present disclosure is shown.

[0029] Fig.11 A block diagram of a communications manager supporting techniques for channel access aware conflict determination for an unlicensed sidelink band is shown in accordance with one or more aspects of the present disclosure.

[0030] Fig.12 A diagram of a system including devices supporting techniques for channel access aware conflict determination for an unlicensed sidelink band is shown in accordance with one or more aspects of the present disclosure.

[0031] Figures 13 to 16 A flow chart illustrating a method of supporting techniques for channel access aware conflict determination for an unlicensed sidelink band in accordance with one or more aspects of the present disclosure is shown. DETAILED DESCRIPTION

[0032] In some wireless communications, each wireless device (e.g., UE) may be able to communicate with each other directly using sidelink communications. Different mechanisms may be used to reduce interference in the sidelink frequency band. In some cases, each UE may exchange inter-UE coordination messages to reserve resources for sidelink communications. In other cases, each UE may perform a listen-before-talk (LBT) process to reduce interference. However, current techniques for reducing interference in the sidelink frequency band may still generate interference.

[0033] Some wireless communication systems have enabled each UE to use inter-UE coordination messages to reserve resources in an unlicensed side link frequency band in an attempt to reduce interference in the unlicensed frequency band. In such cases, the UE may reserve resources in the unlicensed side link frequency band, and may subsequently perform an LBT process to ensure that the UE can use the previously reserved side link resources. However, in some cases, the UE may fail to clear the LBT process (e.g., due to side link resources detected from other UEs), and may therefore be unable to use previously reserved resources. In such cases, a combination of inter-UE coordination messages and LBT processes may result in wasted side link resources. In addition, in some specific implementations, two separate UEs may use inter-UE coordination messages to reserve the same resources, and may successfully clear the corresponding LBT processes (regardless of overlapping reserved resources). In such cases, the LBT process may not successfully resolve conflicts, and may result in increased interference in the side link frequency band.

[0034] Therefore, various aspects of the present disclosure relate to techniques for channel access-aware conflict determination for an unlicensed side link band. In general, the described techniques provide configurations and conditions that enable each UE to determine whether there is a conflict between reserved resources in an unlicensed side link band based on one or more channel access parameters. In some cases, the channel access parameters may be used to determine the relative probability that the LBT process between each reserved UE will not successfully resolve the conflict between overlapping reserved resources. The channel access process that can be used to determine the conflict between reserved resources may include, but is not limited to, a channel occupancy time (COT) parameter (e.g., whether the reserved resource falls within the COT of the reserved UE), a channel access type parameter (e.g., what type of LBT process will be performed to resolve the conflict), a cyclic prefix extension (CPE) parameter (e.g., when the transmission within the conflicting reserved resource is scheduled to start), etc.

[0035] Thus, the techniques described herein may enable a third-party UE (e.g., a non-reserved UE) to identify overlapping resources reserved by other UEs (e.g., a reserved UE) and determine that an LBT process is unlikely to resolve the identified conflict. In such cases, the third-party UE (e.g., a non-reserved UE) may send an indication of the conflict to at least one of the reserved UEs to instruct the reserved UE to reselect new resources to avoid the conflict. By evaluating channel access parameters to determine whether a conflict exists, the third-party UE may be able to determine whether an LBT process performed at the reserved UE is likely to resolve the conflict, or determine whether the third-party UE should send a message indicating the conflict so that one of the UEs can select a new resource to avoid the conflict.

[0036] Various aspects of the disclosure are first described in the context of a wireless communication system. Additional aspects of the disclosure are described in the context of exemplary resource configurations and exemplary process flows. Various aspects of the disclosure are further illustrated by and described with reference to apparatus diagrams, system diagrams, and flow diagrams related to techniques for channel access-aware conflict determination for unlicensed sidelink bands.

[0037] Figure 1 An example of a wireless communication system 100 that supports techniques for channel access awareness conflict determination for an unlicensed sidelink band in accordance with 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).

[0038] 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), and the UE 115 and the network entity 105 may establish one or more communication links 125 over the coverage area. The coverage area 110 may be an example of a geographic area, and the network entity 105 and the UE 115 may support signal communications over the geographic area according to one or more radio access technologies (RATs).

[0039] 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 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 Communicate with other UEs 115 or network entities 105) as shown.

[0040] 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 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 nodes. 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 a second node.

[0041] 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 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 directly (e.g., directly between the network entities 105) or indirectly (e.g., via the core network 130) via the backhaul communication link 120 (e.g., according to X2, Xn, or other interface protocols). In some examples, the network entities 105 may communicate with each other via the midhaul communication link 162 (e.g., according to the midhaul interface protocol) or the fronthaul communication link 168 (e.g., according to the fronthaul interface protocol) or any combination thereof. The backhaul communication link 120, the midhaul communication link 162, or the fronthaul communication link 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), or other examples or various combinations thereof. UE 115 may communicate with core network 130 via communication link 155 .

[0042] 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, standalone) base station architecture, which may be configured to utilize a protocol stack that is physically or logically integrated within a single network entity 105 (e.g., a single RAN node, such as a base station 140).

[0043] 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)).

[0044] The functional split between CU 160, DU 165, and RU 170 is flexible and can 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 can be employed between CU 160 and DU 165, such that CU 160 can support one or more layers of a protocol stack and DU 165 can support one or more different layers of a protocol stack. In some examples, CU 160 can 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 DU 165 and the RU 170, such that the DU 165 may support one or more layers of the protocol stack, and the RU 170 may support one or more different layers of the protocol stack. The DU 165 may support one or more different cells (e.g., via one or more RUs 170). In some cases, the functional split between CU 160 and DU 165 or between DU 165 and RU 170 may be within the protocol layer (e.g., some functions of the protocol layer may be performed by one of CU 160, DU 165, or RU 170, while other functions of the protocol layer are performed by the other of CU 160, DU 165, or RU 170). CU 160 may be further functionally split into CU control plane (CU-CP) functions and CU user plane (CU-UP) functions. CU 160 may be connected to one or more DUs 165 via midhaul communication links 162 (e.g., F1, F1-c, F1-u), and 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 based on interfaces (eg, channels) between layers of a protocol stack supported by respective network entities 105 that communicate via those communication links.

[0045] 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 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 DU 165 of a coupled IAB donor. The IAB-MT may include an independent set of antennas for relaying communications with the UE 115, or may share the same antennas of the IAB node 104 (e.g., of the RU 170) 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.

[0046] For example, an access network (AN) or RAN may include an access node (e.g., an IAB donor), communications between an IAB node 104, and one or more UEs 115. The IAB donor may facilitate a connection between the core network 130 and the AN (e.g., via a wired or wireless connection to the core network 130). That is, the IAB donor may refer to a RAN node having a wired or wireless connection to the core network 130. The IAB donor may include a CU 160 and at least one DU 165 (e.g., and RU 170), wherein the CU 160 may communicate with the core network 130 via an interface (e.g., a backhaul link). The IAB donor and the IAB node 104 may communicate via an F1 interface according to a protocol defining a signaling message (e.g., an F1 AP protocol). Additionally or alternatively, CU 160 may communicate with the core network via an interface (which may be an example of a portion of a backhaul link) and may communicate with other CUs 160 (e.g., CU 160 associated with an alternative IAB donor) via an Xn-C interface (which may be an example of a portion of a backhaul link).

[0047] An IAB node 104 may refer to a RAN node that provides IAB functionality (e.g., access for UE 115, wireless self-backhaul capabilities, etc.). DU 165 may act as a distributed scheduling node toward child nodes associated with IAB node 104, and IAB-MT may act as a scheduled node toward a parent node associated with IAB node 104. That is, an IAB donor may be referred to as a parent node that communicates with one or more child nodes (e.g., an IAB donor may relay for UE transmissions through one or more other IAB nodes 104). Additionally or alternatively, depending on the relay chain or configuration of the AN, an IAB node 104 may also be referred to as a parent node or child node of other IAB nodes 104. Thus, the IAB-MT entity of the IAB node 104 may provide a Uu interface for the child IAB node 104 to receive signaling from the parent IAB node 104 , and a DU interface (eg, DU 165 ) may provide a Uu interface for the parent IAB node 104 to signal to the child IAB node 104 or the UE 115 .

[0048] For example, the IAB node 104 may be referred to as a parent node supporting communications for a child IAB node or as a child node associated with an IAB donor, or both. The IAB donor may include a CU 160 having a wired or wireless connection (e.g., backhaul communication link 120) to the core network 130, and may act as a parent node of the IAB node 104. For example, the DU 165 of the IAB donor may relay transmission to the UE 115 through the IAB node 104, or may directly signal the transmission to the UE 115, or both. The CU 160 of the IAB donor may signal the establishment of a communication link to the IAB node 104 via the F1 interface, and the IAB node 104 may schedule transmission (e.g., transmission relayed from the IAB donor to the UE 115) via the DU 165. That is, data may be relayed to and from the IAB node 104 via signaling via the NR Uu interface to the MT of the IAB node 104. Communications with the IAB node 104 may be scheduled by the DU 165 of the IAB donor, and communications with the IAB node 104 may be scheduled by the DU 165 of the IAB node 104 .

[0049] 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 the techniques for channel access awareness conflict determination for unlicensed sidelink bands as described herein. For example, some operations described as being performed by UE 115 or network entity 105 (e.g., base station 140) may additionally or alternatively be 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).

[0050] 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 terminology, 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.

[0051] 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.

[0052] 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 collection of RF spectrum resources having a defined physical layer structure for supporting the communication link 125. For example, a carrier for the communication link 125 may include a portion of 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 to have 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 a device 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 the network entity 105 (e.g., base station 140, CU 160, DU 165, RU 170) of the RAN communicating with another device (e.g., directly or via one or more other network entities 105).

[0053] 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 performed by UE 115 via the carrier, or a carrier may operate in a non-standalone mode, in which case the connection is anchored using a different carrier (e.g., a different carrier of the same or different radio access technology).

[0054] 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 FDD mode), or may be configured to carry both downlink communications and uplink communications (e.g., in TDD mode).

[0055] 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 (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 megahertz (MHz)) of a carrier of a particular radio access technology. A device (e.g., a network entity 105, a UE 115, or both) of the wireless communication system 100 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 a 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 a carrier bandwidth.

[0056] The signal waveform transmitted via the carrier wave may be composed of 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 using 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 number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both), so that a relatively high number of resource elements (e.g., in the transmission duration) and a relatively high order modulation scheme may correspond to a relatively high communication rate. Wireless communication resources may refer to a combination of RF spectrum resources, time resources, and spatial resources (e.g., spatial layers, beams), and the use of multiple spatial resources may increase the data rate or data integrity of the communication with the UE 115.

[0057] One or more parameter sets for a carrier may be supported, and the parameter sets may include subcarrier spacing (Δf) and cyclic prefixes. 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.

[0058] The time interval for the network entity 105 or the UE 115 may be expressed as a multiple of a basic time unit, which may be, for example, a sampling period T s =1 / (Δf max *N f ) seconds, where Δf max It can represent the supported subcarrier spacing, and N f 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).

[0059] Each frame may include multiple consecutively numbered subframes or time slots, and each subframe or time slot may have the same duration. In some examples, the frame may be divided into subframes (e.g., in the time domain), and each subframe may be further divided into multiple 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 multiple symbol periods (e.g., depending on the length of the cyclic prefix added before each symbol period). In some wireless communication systems 100, the time slot may also be divided into multiple mini-time slots associated with one or more symbols. Excluding the cyclic prefix, each symbol period may be associated with one or more (e.g., N f The duration of a symbol period may depend on the subcarrier spacing or the operating frequency band.

[0060] A subframe, a time slot, a mini-time slot, or a symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communication system 100 and may be referred to as a transmission time interval (TTI). In some examples, the TTI duration (e.g., the number of symbol periods in a TTI) may be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communication system 100 may be dynamically selected (e.g., in bursts of shortened TTIs (sTTIs)).

[0061] Physical channels may be multiplexed using carriers for communication according to various techniques. For example, physical control channels and physical data channels may be multiplexed via downlink carriers for signaling using one or more of a time division multiplexing (TDM) technique, a frequency division multiplexing (FDM) technique, or a hybrid TDM-FDM technique. A control region (e.g., a control resource set (CORESET)) for a physical control channel may be defined by a set of symbol periods and may extend across a system bandwidth or a subset of a system bandwidth of a carrier. One or more control regions (e.g., CORESETs) may be configured for a set of UEs 115. For example, one or more UEs in UE 115 may monitor or search a control region for control information according to one or more search space sets, and each search space set may include one or more control channel candidates in one or more aggregation levels arranged in a cascaded manner. The aggregation level of a control channel candidate 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 a plurality of UEs 115 , and a UE-specific search space set for transmitting control information to a specific UE 115 .

[0062] 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 various coverage areas 110 using the same or different radio access technologies.

[0063] 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 or low-latency or critical functions. Ultra-reliable communication may include private communication or group communication, 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 applications or general commercial applications. The terms ultra-reliable, low-latency, and ultra-reliable low-latency are used interchangeably herein.

[0064] 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 various aspects of such D2D communication configured (e.g., scheduled) by the network entity 105. In some examples, one or more UEs 115 of 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 conducted between UEs 115 without involving network entity 105.

[0065] 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), or communicate with the network via one or more network nodes (e.g., network entity 105, base station 140, RU 170) using vehicle-to-network (V2N) communication, or both.

[0066] 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 for managing access and mobility (e.g., a mobility management entity (MME), an access and mobility management function (AMF)) and at least one user plane entity for routing packets or interconnecting to an external network (e.g., a serving gateway (S-GW)), a packet data network (PDN) gateway (P-GW), or a user plane function (UPF)). The control plane entity may manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management for UE 115 served by a network entity 105 (e.g., a base station 140) associated with the core network 130. User IP packets may be delivered via the user plane entity, which may provide IP address allocation and other functions. The user plane entity may be connected to an IP service 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.

[0067] 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). Typically, the region from 300 MHz to 3 GHz is referred to as the ultra-high frequency (UHF) region or decimeter band because the wavelength range is approximately one decimeter to one meter. 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 services 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 lower frequencies and longer waves in the high frequency (HF) or very high frequency (VHF) portions of the spectrum below 300 MHz.

[0068] The wireless communication system 100 may also operate in a super high frequency (SHF) region (also known as a centimeter band) in the range of 3 GHz to 30 GHz or in an extremely high frequency (EHF) region (e.g., 30 GHz to 300 GHz) (also known as a millimeter band) using a spectrum. In some examples, the wireless communication system 100 may support millimeter wave (mmW) communication between UE 115 and network entity 105 (e.g., base station 140, 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 affected by greater attenuation and 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.

[0069] 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 entities 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 in combination with component carriers operating using licensed bands (e.g., LAA). Operations using unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, and the like.

[0070] 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) communications, or beamforming. The antennas of the network entity 105 or UE 115 may be located in one or more antenna arrays or antenna panels that can 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 rows and columns of antenna ports 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 can support various MIMO or beamforming operations. Additionally or alternatively, the antenna panel may support RF beamforming for signals sent via the antenna ports.

[0071] The network entity 105 or UE 115 may use MIMO communication to utilize multipath signal propagation and improve spectral efficiency by sending or receiving multiple signals via different spatial layers. Such technology may be referred to as spatial multiplexing. Multiple signals may be, for example, sent by a transmitting device via different antennas or different combinations of antennas. Similarly, multiple signals may be received by a receiving device via different antennas or different combinations of antennas. Each of the multiple signals may be referred to as a separate spatial stream and may carry information associated with the same data stream (e.g., the same codeword) or different data streams (e.g., different codewords). Different spatial layers may be associated with different antenna ports for channel measurement and reporting. MIMO technologies include single-user MIMO (SU-MIMO), in which multiple spatial layers are sent to the same receiving device; and multi-user MIMO (MU-MIMO), in which multiple spatial layers are sent to multiple devices.

[0072] 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 conveyed 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 conveyed via antenna elements may include the transmitting device or the receiving device applying an amplitude offset, a phase offset, or both to signals carried via antenna elements associated with the device. Adjustments associated with each of the antenna elements may be defined by a set of beamforming weights associated with a particular orientation (e.g., relative to the antenna array of the transmitting device or the receiving device or relative to some other orientation).

[0073] The network entity 105 or UE 115 may use beam scanning techniques as part of a beamforming operation. For example, the network entity 105 (e.g., base station 140, RU 170) may use multiple antennas or antenna arrays (e.g., antenna panels) to perform beamforming operations for directional communication with UE 115. Some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be sent multiple times by the network entity 105 along different directions. For example, the network entity 105 may send signals according to different sets of beamforming weights associated with different transmission directions. Transmissions along different beam directions may be used to identify (e.g., by a transmitting device (such as network entity 105), or by a receiving device (such as UE 115)) beam directions for later transmission or reception by the network entity 105.

[0074] Some signals, such as data signals associated with a particular receiving device, may be sent by a transmitting device (e.g., transmitting network entity 105, transmitting UE 115) along a single beam direction (e.g., a direction associated with a receiving device (such as receiving network entity 105 or receiving UE 115)). In some examples, a beam direction associated with transmission along a single beam direction may be determined based on signals sent along one or more beam directions. For example, UE 115 may receive one or more of the signals sent by network entity 105 along different directions, and may report to network entity 105 an indication of the signal received by UE 115 with the highest signal quality or other acceptable signal quality.

[0075] In some examples, transmission by a device (e.g., by network entity 105 or UE 115) may be performed using multiple beam directions, and the device may use a combination of digital precoding or beamforming to generate a combined beam for transmission (e.g., from network entity 105 to UE 115). UE 115 may report feedback indicating precoding weights for one or more beam directions, and the feedback may correspond to a configured set of beams across a system bandwidth or one or more subbands. Network entity 105 may send a reference signal (e.g., a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS)), which may be precoded or non-precoded. UE 115 may provide feedback for beam selection, which may be a precoding matrix indicator (PMI) or codebook-based feedback (e.g., a multi-panel codebook, a linear combination codebook, a port selection codebook). Although these techniques are described with reference to signals sent along one or more directions by a network entity 105 (e.g., base station 140, RU 170), UE 115 may use similar techniques to send signals multiple times along different directions (e.g., to identify a beam direction for subsequent transmission or reception by UE 115), or to send signals along a single direction (e.g., to send data to a receiving device).

[0076] A receiving device (e.g., UE 115) may perform receiving operations according to multiple receiving configurations (e.g., directional listening) when receiving various signals (such as synchronization signals, reference signals, beam selection signals, or other control signals) from a receiving device (e.g., network entity 105). For example, the receiving device may perform reception according to multiple receiving directions by receiving via different antenna subarrays, processing the received signals according to different antenna subarrays, receiving according to different receiving beamforming weight sets (e.g., different directional listening weight sets) applied to signals received at multiple antenna elements of an antenna array, or processing the received signals according to different receiving beamforming weight sets applied to signals received at multiple antenna elements of an antenna array, any of which may be referred to as "listening" according to different receiving configurations or receiving directions. In some examples, the receiving device may use a single receiving configuration to receive along a single beam direction (e.g., when receiving a data signal). A single receive configuration may be aligned along a beam direction determined based on listening according to different receive configuration directions (e.g., a beam direction determined to have the highest signal strength, highest signal-to-noise ratio (SNR), or other acceptable signal quality based on listening according to multiple beam directions).

[0077] The wireless communication system 100 may be a packet-based network that operates according to a layered protocol stack. In the user plane, the communication at the bearer or 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 processing and multiplexing of logical channels to 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 a radio bearer for user plane data between the UE 115 and the network entity 105 or the core network 130. The PHY layer may map a transport channel to a physical channel.

[0078] 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 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.

[0079] Therefore, each wireless device of the wireless communication system 100 may be configured to support techniques for channel access-aware conflict determination for an unlicensed side link band. In general, the wireless communication system 100 may support signaling, configurations, and conditions that enable UE 115 and other wireless devices (e.g., IAB nodes) to determine whether there is a conflict between reserved resources in an unlicensed side link band based on one or more channel access parameters. In some cases, the channel access parameters may be used to determine the relative probability that the LBT process between each reserved UE 115 will not successfully resolve a conflict between overlapping reserved resources.

[0080] The channel access process that can be used to determine conflicts between reserved resources may include, but is not limited to, COT parameters (e.g., whether the reserved resources fall within the COT of the reserved UE), channel access type parameters (e.g., what type of LBT process will be performed to resolve the conflict), CPE parameters (e.g., when transmission within the conflicting reserved resources is scheduled to start), etc.

[0081] For example, the first UE 115 may receive a first side link control information (SCI) message from a second UE 115 that reserves a first resource of a shared frequency band (e.g., an unlicensed side link frequency band). The first UE 115 may also receive a second SCI message from a third UE 115 that reserves a second resource of the shared frequency band, wherein the first resource and the second resource overlap in time and frequency. In this example, the first UE 115 may determine whether there is a conflict between the overlapping first resource and the second resource based on the signal strength associated with the signal received from the second UE 115 and / or the third UE 115 and based on one or more channel access parameters. If there is a conflict, the first UE 115 may send an indication of the identified conflict to the second UE 115 or the third UE 115 with a lower priority communication, so that the corresponding UE 115 may select a new resource to avoid the conflict and reduce interference within the shared radio frequency band.

[0082] In particular, the first UE 115 may evaluate the channel access parameters to determine whether the LBT process performed at the second UE 115 and the third UE 115 is likely to resolve the potential conflict between the resources. If the channel access parameters indicate that the LBT process is likely to resolve the potential conflict, the first UE 115 may determine that there is no conflict and may avoid sending a conflict indication. Conversely, if the channel access parameters indicate that the LBT process is unlikely to resolve the potential conflict, the first UE 115 may send an indication of the identified conflict to reduce interference within the shared radio frequency band.

[0083] The techniques described herein may enable UE 115 to identify and resolve potential conflicts within a shared radio frequency band, such as an unlicensed side link frequency band. In particular, the techniques described herein may utilize channel access parameters associated with side link communications between devices in order to determine the relative likelihood that an LBT process will resolve a potential conflict. In this regard, the techniques described herein may enable UE 115 to determine whether a conflict exists and whether it is desired that UE 115 send a conflict indication to help avoid the conflict. Thus, aspects of the present disclosure may reduce interference and noise within a shared radio frequency band, and may result in more efficient resource utilization within the shared radio frequency band.

[0084] Figure 2 An example of a wireless communication system 200 that supports techniques for channel access aware conflict determination for an unlicensed sidelink band in accordance with one or more aspects of the present disclosure is illustrated. In some examples, the wireless communication system 200 may implement aspects of the wireless communication system 100.

[0085] The wireless communication device 200 may include a first UE 115-a, a second UE 115-b, and a third UE 115-c, which may all be reference UEs. Figure 1Examples of UEs 115 described. The UEs 115 may communicate with each other directly on respective wireless channels of the wireless communication system 200. For example, a first UE 115-a and a second UE 115-b may communicate via a first side link channel 205-a. Similarly, a first UE 115-a and a third UE 115-c may communicate using a second side link channel 205-b, and a second UE 115-b and a third UE 115-c may communicate using a third side link channel 205-c.

[0086] In some cases, the sidelink channel 205 may include resources associated with a physical sidelink control channel (PSCCH), a physical sidelink shared channel (PSSCH), a physical sidelink feedback channel (PSFCH), or any combination thereof. Additionally, in some cases, the sidelink channel 205 may be associated with a licensed sidelink frequency band, an unlicensed sidelink frequency band (e.g., a shared radio frequency band), or both.

[0087] As previously noted herein, in some implementations, the UEs 115 may be configured to exchange inter-UE coordination information (e.g., inter-UE coordination messages) associated with resource conflicts within a set of resources, such as a licensed radio band. For example, in the context of inter-UE coordination scheme 2, the second UE 115-b may be configured to send an SCI message to reserve resources for sidelink communications. In this example, the first UE 115-a may be configured to send, to the second UE 115-b, inter-UE coordination information associated with a resource conflict that the second UE 115-b has reserved, such as when the resources reserved by the second UE 115-b overlap with resources reserved by another UE 115.

[0088] In other words, the first UE 115-a may indicate an expected resource conflict with resources reserved by the second UE 115-b. In such a case, the first UE 115-a may be a recipient of at least one transport block associated with the conflicting reservation. In addition, whether the non-destination UE 115 of the transport block sent by the second UE 115-b can be the first UE 115-a can be configured by an RRC parameter (e.g., RRC parameter sl-TypeUE-A).

[0089] Continuing with reference to inter-UE coordination scheme 2, the first UE 115-a may be configured to identify conflicts between resources reserved by other UEs 115. Conflicts may occur in several scenarios. For example, in some cases, the second UE 115-b may reserve resources that overlap with resources reserved by a third UE 115-c. In such cases, if one or more conditions are met, the first UE 115-a may identify a conflict between overlapping resources. In some aspects, which condition is used to determine the presence of a conflict may be configured via RRC signaling (e.g., RRC signaling from the network, from UE 115, etc.).

[0090] Using the first condition (condition A), a conflict may occur when the RSRP measurement of the transmission (e.g., SCI) from the second UE 115-b to the first UE 115-a is above a threshold. For example, if the first UE 115-a is the intended recipient of the PSSCH message in the resources reserved by the second UE 115-b, the first UE 115-a may use the first condition to determine a conflict when the RSRP of the transmission received from the third UE 115-c is above a threshold. Similarly, if the first UE 115-a is the intended recipient of the PSSCH message in the resources reserved by the third UE 115-c, the first UE 115-a may determine a conflict when the RSRP of the transmission received from the second UE 115-b is above a threshold. In some aspects, the threshold (thresh(p1, p2)) may be configured via RRC signaling.

[0091] Using the second condition (condition B), a collision may occur when the difference in RSRP measurements between the colliding transmissions (e.g., SCI) of the second UE 115-b and the third UE 115-b is above a threshold. For example, if the first UE 115-a is the intended recipient of the PSSCH message in the resources reserved by the second UE 115-b, the first UE 115-a may be in the condition where RSRP2>RSRP1+Δ Th In the case of determining resource conflicts, where RSRP1 and RSRP2 are RSRP measurements from signals received by the first UE 115-a from the second UE 115-b and the third UE 115-c, respectively, and where Δ Th Similarly, if the first UE 115-a is the intended recipient of the PSSCH message in the resources reserved by the third UE 115-c, the first UE 115-a may receive the PSSCH message when RSRP1>RSRP2+Δ Th resource conflicts in the event of a conflict.

[0092] In additional or alternative embodiments, a conflict may occur when the first UE 115-a has a half-duplex conflict in a time slot in which the second UE 115-b is scheduled to transmit. In other words, the first UE 115-a may determine the presence of a conflict when resources reserved by the second UE 115-b overlap with resources previously reserved by the first UE 115-a.

[0093] In the event that the first UE 115-a identifies a conflict between resources reserved by other UEs 15-b, 115-c, the first UE 115-a may send a conflict indicator to the UE 115 having a lower priority transmission. In some aspects, the ability of the UEs 115 to receive the conflict indicator may be signaled via SCI-1 (if preconfigured). That is, the UEs 115 may indicate to each other whether they are capable of receiving messages indicating resource conflicts (e.g., capable of receiving inter-UE coordination messages indicating resource conflicts).

[0094] For example, the second UE 115-b may reserve resources for a sidelink transmission having a priority of p1, and the third UE 115-c may reserve resources for a sidelink transmission having a priority of p2, where p2>p1. In this example, if the first UE 115-a identifies a conflict between resources, the first UE 115-a may send a conflict indicator to the second UE 115-b (e.g., via a PSFCH message) because the second UE 115-b is associated with a lower priority transmission. In this regard, the first UE 115-a may instruct / request the second UE 115-b to select new resources for the sidelink transmission.

[0095] Upon receiving a PSFCH message including a conflict indication, the second UE 115-b may determine the presence of a source conflict based on the conflict information in the PSFCH message, and the second UE 115-b may report the resource conflict to a higher layer. If slotLevelResourceExclusionScheme2 is not provided, the second UE 115-b may be configured to report resources that overlap with the resources reserved at the next time indicated by SCI format 1-A (time-frequency resource conflict). In comparison, if slotLevelResourceExclusionScheme2 is provided, the second UE 115-b may be configured to report resources (half-duplex) in the time slot of the resources reserved at the next time indicated by SCI format 1-A. In this example, the MAC layer at the second UE 115-b may reselect the reported resources (e.g., select new resources that do not include conflicting resources) from the resources indicated by the PHY layer (excluding the reported resources).

[0096] Another example for inter-UE coordination scheme 2 may prove illustrative. In this example, the first UE 115-a may determine to which (if any) UE 115 to send conflict information via a PSFCH message according to the following. First, if typeAUEScheme2 is disabled for the resource pool, the first UE 115-a has been indicated as the first reserved resource and the second reserved resource as resources for PSSCH reception, or if typeAUEScheme2 is enabled for the resource pool, the first UE 115-a has been indicated as at least the first reserved resource or the second reserved resource for PSSCH reception.

[0097] Continuing with the same example, the first UE 115-a may detect a first SCI message (e.g., SCI format 1-A) from the second UE 115-b including a first priority value p1, wherein the first SCI message indicates reserved resources for PSSCH transmissions from the second UE 115-b. Similarly, the first UE 115-a may detect a second SCI message (e.g., SCI format 1-A) from the third UE 115-c including a second priority value p2, wherein the second SCI message indicates reserved resources for PSSCH transmissions from the third UE 115-c. Subsequently, the first UE 115-a may determine that the first resources and the second resources overlap in time and frequency, and that the PSFCH timing for resource conflict information for the second UE 115-b and the third UE 115-c is valid. If indicationUEBScheme2 = 'enabled', the indicationUEB flag in the SCI format 1-A from the second UE 115-b and the third UE 115-c may be set to 1. In addition, the first UE 115-a may determine that the first SCI format 1-A and the second SCI format 1-A are received no later than sl-MinTimeGapPSFCH before the PSFCH timing for conflicting information. In this example, the first UE 115-a may send conflicting information to the second UE 115-b via PSFCH when p2>p1, and may send conflicting information to the second UE 115-b or the third UE 115-c via PSFCH when p2=p1.

[0098] Additional or alternative techniques may be used to attempt to reduce interference on a shared or unlicensed sidelink frequency band. For example, in some cases, the wireless communication system 200 may support sidelink communications on an unlicensed spectrum (e.g., a shared radio frequency band). The unlicensed spectrum may be shared by other technologies (e.g., Wi-Fi), and access to the unlicensed spectrum may be subject to regulatory requirements. For example, in some cases, a device (e.g., UE 115-) may be required to perform an LBT procedure before performing communications on the unlicensed spectrum, wherein the device performs sensing (e.g., listening) before the device can transmit (e.g., speak) on the unlicensed spectrum.

[0099] During the LBT process, a device may measure the energy within a monitored radio band and may be able to access the spectrum (e.g., transmit over the band) if the measured energy is below a certain threshold. In other words, in the context of unlicensed / shared spectrum, a device may be required to determine that the band is not in use before it can transmit over the band.

[0100] There are different types of LBT procedures, including a CAT 2 LBT procedure and a CAT 4 LBT procedure. According to the CAT 2 LBT procedure, a device may perform LBT without a random backoff, in which the device performs channel sensing for a corresponding radio band at a fixed sensing duration (e.g., without the random backoff). Comparatively, according to the CAT 4 LBT procedure, a device may perform LBT using a random backoff with a contention window of variable size (e.g., the channel sensing duration is random or variable). In some cases, the sensing duration may be shorter in CAT 2 LBT than in CAT 4 (e.g., it is easier to access a channel in CAT 2 than in CAT 4).

[0101] Thus, different types of LBT (e.g., CAT 2, CAT 4) may be used in different environments, such as based on whether the transmission is within or outside the COT. For transmissions within the COT, CAT 2 LBT may be used or no LBT may be used based on the gaps between transmissions. In contrast, for transmissions outside the COT, a CAT 4 LBT process may be used.

[0102] As previously noted herein, some wireless communication systems enable UE 115 to reserve resources in an unlicensed sidelink band using inter-UE coordination messages to attempt to reduce interference in the unlicensed band. In such cases, UE 115 may reserve resources in the unlicensed sidelink band, and may subsequently perform an LBT process to ensure that UE 115 can use previously reserved sidelink resources. In other words, in the context of sidelink communication by an unlicensed band (e.g., a shared radio band), in the case where UE 115 has successfully selected resources and broadcasts resource reservations via SCI (e.g., SCI-1), UE 115 may potentially fail to clear LBT for channel access to obtain future reserved resources, and may therefore be unable to use previously reserved resources. Considering potential LBT failures in unlicensed bands, conflicts may or may not occur on overlapping reserved resources. Thus, previous conflict determination / resolution techniques described herein (e.g., scheme 2 between UEs) may result in unnecessary resource reselection in an unlicensed band.

[0103] For example, Figure 2 As shown, the second UE 115-b may send a first SCI message 210-a to the first UE 115-a, wherein the first SCI message 210-a reserves resources 215 for the first side link message within an unlicensed band (e.g., a shared radio frequency spectrum 220). Similarly, the third UE 115-c may send a second SCI message 210-b to the first UE 115-a, wherein the second SCI message 210-b reserves resources 215 for the second side link message within the unlicensed band. In this example, the resources 215 reserved by the UEs 115-b and 115-c may be the same, or may at least partially overlap in the time domain and the frequency domain. In addition, the SCI messages 210-a and 210-b may indicate priorities p1 and p2 associated with the scheduled side link messages.

[0104] In this example, even if the resources 215 reserved by both the second UE 115-b and the third UE 115-c overlap each other, a resource conflict may or may not exist or actually occur depending on whether the resource conflict is in the COT or outside the COT. For example, if the resources 215 are located outside the COT for both UEs 115-b and 115-c (e.g., both are outside the COT), LBT randomization can reduce the probability of conflict. In addition, in the case where the scheduled side link messages are low priority in the COT and high priority outside the COT (and / or high priority in the COT and low priority outside the COT), different LBT types can reduce the probability of conflict within the overlapping resources 215. In particular, if the second UE 115-b performs LBT process 225-a and the third UE 115-b performs LBT process 225-b, one of UEs 115-b, 115-c is likely to fail LBT before reserving resources 215, thereby avoiding conflicts / interferences within resources 215.

[0105] In comparison, if resource 215 is in the COT for both UE 115-b, 115-c, the probability of collision may be high because the same LBT type may be used. In other words, if both are in the COT, UE 115-b, 115-c may perform the same LBT process (e.g., listening at the same time) and may therefore fail to identify the conflicting resource 215.

[0106] In other words, even if the resources 215 reserved by both UE 115-b and 115-c overlap with each other, the relative probability that a conflict / collision will actually occur within the resources may depend on several factors / parameters, including the type of LBT process 225 to be performed (e.g., the duration for the LBT process 225), whether the resources are in or outside the COT for the corresponding UE 115, etc.

[0107] Thus, according to some aspects of the present disclosure, in a situation where resources 215 overlap with each other but the overlap is unlikely to result in a conflict (because one of UE 115-b, 115-c is likely to cause LBT to fail), UE 115-a can determine that an actual conflict does not exist (or is otherwise unlikely to result in a conflict), and therefore the first UE 115-a can avoid sending a conflict indication.

[0108] Aspects of the present disclosure relate to techniques for channel access-aware conflict determination for unlicensed side link bands. In general, the described techniques provide configurations and conditions that enable each UE 115 to determine whether there is a conflict between reserved resources in an unlicensed side link band based on one or more channel access parameters. In some cases, the channel access parameters may be used to determine the relative probability that the LBT process between each reserved UE 115 will not successfully resolve the conflict between overlapping reserved resources.

[0109] For example, Figure 2 As shown, the first UE 115-a may receive capability information 230-a, 230-b from the second UE 115-b, the third UE 115-c, or both, indicating whether the second UE 115-b and / or the third UE 115-c is capable of receiving the conflict indication 235. In some cases, the capability information 230 may be communicated via the SCI message 210. In other words, the UE 115-b, 115-c may broadcast or otherwise indicate whether the UE 115-b, 115-c is capable of receiving an inter-UE coordination message (e.g., a PSFCH message, an SCI message 210) indicating a resource conflict.

[0110] The first UE 115-a may receive a first SCI message 210-a from the second UE 115-b, wherein the first SCI message 210-a indicates first reserved resources 215 to be used by the second UE 115-b for sidelink communications within a shared radio frequency spectrum 220 (e.g., an unlicensed band). In some cases, the first SCI message 210-a may indicate a first priority (p1) associated with the first reserved resources 215, the sidelink communications scheduled to be performed within the first resources 215, the second UE 115-b, or any combination thereof.

[0111] Similarly, the first UE 115-a may receive a second SCI message 210-b from the third UE 115-c, wherein the second SCI message 210-b indicates second reserved resources 215 to be used by the third UE 115-c for sidelink communications within the shared radio frequency spectrum 220. Figure 2 As shown, the second resources 215 may be the same as the first resources 215 reserved by the second UE 115-b, or may at least partially overlap in time and frequency with the first reserved resources 215 reserved by the second UE 115-b. In some cases, the second SCI message 210-b may indicate a second priority (p2) associated with the second resources 215, the sidelink communication scheduled to be performed within the second resources 215, the third UE 115-c, or any combination thereof.

[0112] In some aspects, the first UE 115-a may determine whether there is a conflict between the first resource 215 reserved by the second UE 115-b and the second resource 215 reserved by the third UE 115-c. In particular, the first UE 115-a may determine whether there is a conflict based on whether the overlapping resources 215 are likely to cause a conflict or are resolved via an LBT process at the respective UEs 115-b, 115-c. In this regard, the first UE 115-a may determine whether there is a conflict based on receiving the first SCI message 210 at 810, receiving the second SCI message 210 at 815, or both.

[0113] In some aspects, the first UE 115-a may determine whether a conflict exists based on the first resource 215 and the second resource 215 at least partially overlapping each other in time and frequency. Additionally, the first UE 115-a may determine whether a conflict exists based on a signal strength associated with a signal (e.g., SCI message 210) received from the second UE 115-b, the third UE 115-c, or both.

[0114] In addition, the first UE 115-a may determine whether a conflict exists based on one or more additional channel access parameters associated with communications at / with the second UE 115-b, the third UE 115-c, or both. Channel access parameters used to perform conflict determination may include, but are not limited to, COT parameters (e.g., whether the reserved resources 215 fall within the COT of the corresponding UE 115-b, 115-c), channel access type parameters (e.g., what type of LBT process will be performed by UE 115-b, 115-c), CPE parameters (e.g., when transmission within the conflicting reserved resources 215 is scheduled to start), etc. As previously described herein, the channel access parameters may be used by the first UE 115-a to determine the relative likelihood or probability that overlapping resources are likely to result in a conflict (e.g., the relative probability that the LBT process will resolve the potential conflict before it conflicts).

[0115] For example, the first UE 115-a may determine whether there is a conflict based on COT parameters associated with the second UE 115-b, the third UE 115-c, or both. In this example, if the first resource 215 reserved by the second UE 115-b is in the COT associated with the second UE 115-b (or shared to / with the second UE 115-b), and if the second resource 215 reserved by the third UE 115-c is in the COT associated with the third UE 115-c (or shared to / with the third UE 115-c), the first UE 115-a may determine that there is a conflict. In other words, if at least one of the first resource 215 or the second resource 215 is not within the COT of the corresponding corresponding UE 115-b, 115-c, the first UE 115-a may be configured to determine that there is no conflict (or that the LBT process performed at the corresponding UE 115-b, 115-c is likely to resolve the potential conflict before the conflict).

[0116] Reference Figure 3 Conflict determination based on COT parameters is further shown and described.

[0117] As another example, in some cases, the first UE 115-a may determine whether there is a conflict based on a channel access type parameter associated with the second UE 115-b, the third UE 115-c, or both. In this example, if the first resource 215 reserved by the second UE 115-b and the second resource 215 reserved by the third UE 115-c are associated with the same channel access type (e.g., both are CAT 2 16ms, both are CAT 2 25ms, both are CAT 4, etc.), the first UE 115-a may determine that there is a conflict. In other words, if the first channel access type associated with the first resource 215 reserved by the second UE 115-b and the second channel access type associated with the second resource 215 reserved by the third UE 115-c are different, the first UE 115-a may be configured to determine that there is no conflict (or that the LBT process performed at the respective UEs 115-b, 115-c is likely to resolve the potential conflict before it conflicts).

[0118] Reference Figure 4 Conflict determination based on a channel access type parameter is further shown and described.

[0119] As another example, in some cases, the first UE 115-a may determine whether a conflict exists based on CPE parameters associated with transmissions to be performed by the second UE 115-b, the third UE 115-c, or both. In this example, if the first resource 215 reserved by the second UE 115-b and the second resource 215 reserved by the third UE 115-c are associated with the same CPE, the first UE 115-a may determine that a conflict exists. In other words, if the first CPE associated with the first resource and the second CPE associated with the second resource are different (e.g., transmissions within the resources are scheduled to start at different times), the first UE 115-a may be configured to determine that there is no conflict (or that the LBT process performed at the respective UEs 115-b, 115-c is likely to resolve the potential conflict before it conflicts).

[0120] Reference Figure 5 Conflict determination based on CPE parameters is further shown and described.

[0121] Additionally, in some cases, the first UE 115-a may be configured to evaluate whether a conflict exists based on one or more channel access parameters. Figure 6 Conflict determination based on multiple channel access parameters is further shown and described.

[0122] Additionally, in some cases, the first UE 115-a may be configured to evaluate whether a conflict exists based on how many overlapping resources exist (e.g., how many UEs 115 have reserved overlapping resources). Figure 7 Conflict determination based on the number of overlapping resources is further shown and described.

[0123] In the event that the first UE 115-a determines that there is no conflict (or that the overlapping resources 215 are unlikely to cause a conflict), the first UE 115-a may refrain from sending the conflict indication 235. Conversely, in the event that the first UE 115-a determines that there is a conflict (e.g., the overlapping resources 215 are likely to cause a conflict), the first UE 115-a may send a conflict indication to one (or both) of the UEs 115-b, 115-c associated with the conflict.

[0124] For example, in a case where a first resource 215 / transmission reserved or scheduled by a second UE 115-b is associated with a lower priority (e.g., p2>p1) than a second resource 215 / transmission reserved or scheduled by a third UE 115-c, the first UE 115-a may send a conflict indication 235 to the second UE 115-b based on the second UE 115-b being associated with the lower priority. The conflict indication 235 may be sent via an SCI message 210, a PSFCH message, etc.

[0125] Subsequently, the second UE 115-b may select new resources (e.g., third resources) for performing sidelink communications. In particular, the second UE 115-b may select new resources based on receiving the conflict indication 235 from the first UE 115-a. In this regard, the conflict indication 235 may help the wireless devices avoid conflicts within the shared radio frequency spectrum 220.

[0126] The techniques described herein may enable UE 115 to identify and resolve potential conflicts within a shared radio frequency spectrum 220, such as an unlicensed side link band. In particular, the techniques described herein may utilize channel access parameters associated with side link communications between devices in order to determine the relative likelihood that an LBT process will resolve a potential conflict. In this regard, the techniques described herein may enable UE 115 to determine whether a conflict exists and whether it is desired that UE 115 send a conflict indication 235 to help avoid the conflict. Thus, aspects of the present disclosure may reduce interference and noise within a shared radio frequency spectrum 220, and may result in more efficient resource utilization within the shared radio frequency spectrum 220.

[0127] Figure 3 Examples of resource configurations 300-a, 300-b that support techniques for channel access awareness conflict determination for an unlicensed sidelink band in accordance with one or more aspects of the present disclosure are illustrated. In some examples, aspects of resource configuration 300 may implement or be implemented by aspects of wireless communication system 100, wireless communication system 200, or both.

[0128] In particular, resource configuration 300 illustrates a conflict determination that may be performed at a first UE 115 (UE1) based on a COT parameter (eg, based on whether the reserved resources are positioned within the COT of the reserved UE 115).

[0129] For example, in some cases, the first UE 115 (UE1) may determine whether a resource conflict exists / occurs when the following conditions are met: (1) the first resources (r1) reserved by the second UE 115 (UE2) overlap with the second resources (r2) reserved by the third UE 115 (UE3), (2) condition A and / or condition B related to the above-mentioned received transmitted RSRP measurement are met, and (3) the first reserved resources r1 are within the COT associated with (or shared to / with) the second UE 115, and the second reserved resources r2 are within the COT associated with (or shared to / with) the third UE 115.

[0130] In such a case, if the first UE 115 determines that there is a conflict based on the COT parameters (e.g., whether the reserved resources are within the COT associated with the corresponding UE 115), the first UE 115 may send a conflict indication to the UE 115 with a lower priority (e.g., UE2, UE3).

[0131] In other words, if at least one of the first reserved resources r1 and the second reserved resources r2 is not within the COT of the corresponding UE 115 (or is not within the shared COT of the corresponding UE 115), the first UE 115 may be configured to determine that there is no conflict even if the remaining conditions (e.g., condition 1, condition 2 (conditions A, B)) are met.

[0132] For example, referring to the first resource configuration 300-a, the first UE 115 (UE1) may receive a first SCI message 310-a from the second UE 115 (UE2), wherein the first SCI message 310-a indicates a first reserved resource 315-a to be used by the second UE 115 for sidelink communications within a shared radio frequency spectrum 320-a (e.g., an unlicensed band). In some cases, the first SCI message 310-a may indicate a first priority (p1) associated with the first reserved resource 315-a, the sidelink communications scheduled to be performed within the first resource 315-a, the second UE 115, or any combination thereof.

[0133] Similarly, the first UE 115 may receive a second SCI message 310-b from a third UE 115 (UE3), wherein the second SCI message 310-b indicates second reserved resources 315-a to be used by the third UE 115 for sidelink communications within the shared radio frequency spectrum 320-a. Figure 3 As shown, the second resource 315-a may be the same as the first resource 315-a reserved by the second UE 115, or may at least partially overlap in time and frequency with the first reserved resource 315-a reserved by the second UE 115. In some cases, the second SCI message 310-b may indicate a second priority (p2) associated with the second resource 315-b, the sidelink communication scheduled to be performed within the second resource 315-b, the third UE 115, or any combination thereof.

[0134] In this example, the second UE 115 and the third UE 115 may be configured to perform the same LBT procedure 325-a before reserving the resource 315-a. Additionally, the reserved resource 315-a may be within the COT 330 associated with each of the corresponding UEs 115. In particular, the first resource 315-a reserved by the first SCI message 310-a is within the COT 330-a associated with (or shared with / to) the second UE 115 (UE2), and the second resource 315-a reserved by the second SCI message 310-b is within the COT 330-b associated with (or shared with / to) the third UE 115 (UE3). Thus, since the resource 315-a reserved by the corresponding UE 115 is located within the COT 330 associated with the corresponding UE 115, the first UE 115 (UE1) may be configured to identify the conflict and send a conflict indication to the UE 115 with a lower priority (e.g., send a conflict indication to UE2 in the case of p1 < p2).

[0135] Comparatively, now refer to the second resource configuration 300-b. As previously described herein, the first UE 115 (UE1) may receive a first SCI message 310-c from the second UE 115 (UE2), where the first SCI message 310-c indicates a first reserved resource 315-b to be used by the second UE 115 for sidelink communication within the shared radio frequency spectrum 320-b (e.g., unlicensed band). In some cases, the first SCI message 310-c may indicate a first priority (p1) associated with the first reserved resource 315-b, the sidelink communication scheduled to be performed within the first resource 315-b, the second UE 115, or any combination thereof.

[0136] Similarly, the first UE 115 may receive a second SCI message 310-d from the third UE 115 (UE3), where the second SCI message 310-d indicates a second reserved resource 315-b to be used by the third UE 115 for sidelink communication within the shared radio frequency spectrum 320-b. As Figure 3 shown, the second resource 315-b may be the same as the first resource 315-b reserved by the second UE 115, or may at least partially overlap in time and frequency with the first reserved resource 315-b reserved by the second UE 115. In some cases, the second SCI message 310-d may indicate a second priority (p2) associated with the second resource 315-b, the sidelink communication scheduled to be performed within the second resource 315-b, the third UE 115, or any combination thereof.

[0137] In this example, the second UE 115 and the third UE 115 may be configured to perform different LBT processes 325-b, 325-c before reserving the resource 315-b. In addition, the first resource 315-b reserved by the second UE 115 (UE2) via the first SCI message 310-c may be within the COT 330-c associated with the second UE 115 (UE2). However, the second resource 315-b reserved by the third UE 115 (UE3) via the second SCI message 310-d may not be located within the COT 330-d associated with the third UE 115 (UE3). Thus, because one of the overlapping resources 315-b is outside the COT, the first UE 115 (UE1) may be configured to identify that there is no conflict, or the LBT process 325 performed by the corresponding UE 115 is likely to resolve the overlapping resource 315-b before any conflict. Thus, the first UE 115 (UE1) may avoid sending a conflict indication based on determining that no conflict exists.

[0138] Figure 4 Examples of resource configurations 400-a, 400-b that support techniques for channel access aware conflict determination for an unlicensed sidelink band in accordance with one or more aspects of the present disclosure are illustrated. In some examples, aspects of resource configuration 400 may implement or be implemented by aspects of wireless communication system 100, wireless communication system 200, resource configuration 300, or any combination thereof.

[0139] In particular, resource configuration 400 illustrates a contention determination that may be performed at a first UE 115 (UE1) based on a channel access type parameter (eg, based on what type of channel access procedure / LBT procedure is to be performed to access reserved resources).

[0140] For example, in some cases, the first UE 115 (UE1) may determine whether a resource conflict exists / occurs when the following conditions are met: (1) the first resources (r1) reserved by the second UE 115 (UE2) overlap with the second resources (r2) reserved by the third UE 115 (UE3), (2) condition A and / or condition B related to the above-mentioned received transmitted RSRP measurement are met, and (3) the first reserved resources r1 and the second reserved resources r2 are associated with the same channel access type.

[0141] In such a case, if the first UE 115 determines that there is a conflict based on a channel access type parameter (e.g., whether the reserved resources are associated with the same channel access type / LBT type), the first UE 115 may send a conflict indication to a UE 115 having a lower priority (e.g., UE2, UE3).

[0142] In other words, if the first channel access type associated with the first reserved resource r1 and the second channel access type associated with the second reserved resource r2 are different, the first UE 115-a can be configured to determine that there is no conflict even if the remaining conditions (e.g., condition 1, condition 2 (conditions A, B)) are met.

[0143] For example, referring to the first resource configuration 400-a, the first UE 115 (UE1) may receive a first SCI message 410-a from the second UE 115 (UE2), wherein the first SCI message 410-a indicates first reserved resources 415-a to be used by the second UE 115 for sidelink communications within a shared radio frequency spectrum 420-a (e.g., an unlicensed band). In some cases, the first SCI message 410-a may indicate a first priority (p1) associated with the first reserved resources 415-a, the sidelink communications scheduled to be performed within the first resources 415-a, the second UE 115, or any combination thereof.

[0144] Similarly, the first UE 115 may receive a second SCI message 410-b from a third UE 115 (UE3), wherein the second SCI message 410-b indicates second reserved resources 415-a to be used by the third UE 115 for sidelink communications within the shared radio frequency spectrum 420-a. Figure 4 As shown, the second resource 415-a may be the same as the first resource 415-a reserved by the second UE 115, or may at least partially overlap in time and frequency with the first reserved resource 415-a reserved by the second UE 115. In some cases, the second SCI message 410-b may indicate a second priority (p2) associated with the second resource 415-b, the sidelink communication scheduled to be performed within the second resource 415-b, the third UE 115, or any combination thereof.

[0145] In this example, the second UE 115 and the third UE 115 (and / or the first / second reserved resources 415-a) may be configured to perform the same type of LBT process 425. For example, Figure 4As shown, the second UE 115 (UE2) may be configured to perform an LBT procedure 425-a that includes a CAT 2–16 ms LBT procedure, and the third UE 115 (UE3) may be configured to perform an LBT procedure 425-b that includes a CAT 2–16 ms LBT procedure. Thus, since the resources 415-a reserved by the respective UE 115 are associated with the same type of channel access type (e.g., both are CAT 2–16 ms), the first UE 115 (UE1) may be configured to identify a conflict and send a conflict indication to the UE 115 with a lower priority (e.g., send a conflict indication to UE2 in the case where p1 < p2).

[0146] Comparatively, now refer to the second resource configuration 400-b. As previously described herein, the first UE 115 (UE1) may receive a first SCI message 410-c from the second UE 115 (UE2), where the first SCI message 410-c indicates a first reserved resource 415-b to be used by the second UE 115 for sidelink communication within a shared radio frequency spectrum 420-b (e.g., an unlicensed band). In some cases, the first SCI message 410-c may indicate a first priority (p1) associated with the first reserved resource 415-b, the sidelink communication scheduled to be performed within the first resource 415-b, the second UE 115, or any combination thereof.

[0147] Similarly, the first UE 115 may receive a second SCI message 410-d from the third UE 115 (UE3), where the second SCI message 410-d indicates a second reserved resource 415-b to be used by the third UE 115 for sidelink communication within the shared radio frequency spectrum 420-b. As Figure 3 shown, the second resource 415-b may be the same as the first resource 415-b reserved by the second UE 115, or may at least partially overlap with the first reserved resource 415-b reserved by the second UE 115 in time and frequency. In some cases, the second SCI message 410-d may indicate a second priority (p2) associated with the second resource 415-b, the sidelink communication scheduled to be performed within the second resource 415-b, the third UE 115, or any combination thereof.

[0148] In this example, the second UE 115 and the third UE 115 (and / or the first / second reserved resources 415-a) may be configured to perform different types of LBT procedures 425. For example, as Figure 4As shown, the second UE 115 (UE2) may be configured to perform an LBT process 425-c including a CAT 2 LBT process, and the third UE 115 (UE3) may be configured to perform an LBT process 425-d including a CAT 4 LBT process. In this way, because the resources 415-a reserved by the respective UEs 115 are associated with different channel access types (e.g., CAT 2 and CAT 4), the first UE 115 (UE1) may be configured to identify that there is no conflict, or that the LBT process 425 performed by the respective UEs 115 is likely to resolve the overlapping resources 415-b before any conflict. Thus, the first UE 115 (UE1) may avoid sending a conflict indication based on determining that there is no conflict.

[0149] As shown in resource configuration 400-b, CAT 2 LBT process and CAT 4 LBT process can be considered as different channel access types. Additionally, CAT 2 LBT processes with different sensing durations can also be considered as different channel access types. For example, for the purpose of determining conflicts between resources corresponding to the corresponding LBT processes, a CAT 2 LBT process with a sensing duration of 16 ms and a CAT 2 LBT process with a sensing duration of 25 ms can be considered as different channel access types.

[0150] Figure 5 An example of a resource configuration 500 that supports techniques for channel access aware conflict determination for an unlicensed sidelink band in accordance with one or more aspects of the present disclosure is illustrated. In some examples, aspects of the resource configuration 500 may implement or be implemented by aspects of the wireless communication system 100, the wireless communication system 200, the resource configurations 300, 400, or any combination thereof.

[0151] In particular, resource configuration 500 illustrates a conflict determination that may be performed at a first UE 115 (UE1) based on CPE parameters (eg, based on a CPE associated with the reserved resources).

[0152] For example, in some cases, the first UE 115 (UE1) may determine whether a resource conflict exists / occurs when the following conditions are met: (1) the first resource (r1) reserved by the second UE 115 (UE2) overlaps with the second resource (r2) reserved by the third UE 115 (UE3), (2) condition A and / or condition B related to the above-mentioned received transmitted RSRP measurement are met, and (3) the first reserved resource r1 and the second reserved resource r2 are associated with the same CPE.

[0153] In such a case, if the first UE 115 determines that there is a conflict based on the channel access type parameter (e.g., whether the reserved resources are associated with the same CPE), the first UE 115 may send a conflict indication to the UE 115 with a lower priority (e.g., UE2, UE3).

[0154] In other words, if the first CPE associated with the first reserved resource r1 and the second CPE associated with the second reserved resource r2 are different, the first UE 115-a can be configured to determine that there is no conflict even if the remaining conditions (e.g., condition 1, condition 2 (condition A, B)) are met.

[0155] For example, generally referring to the first resource configuration 500, the first UE 115 (UE1) may receive a first SCI message 510-a from the second UE 115 (UE2), wherein the first SCI message 510-a indicates first reserved resources 515-a to be used by the second UE 115 for sidelink communications within a shared radio frequency spectrum 520 (e.g., an unlicensed band). In some cases, the first SCI message 510-a may indicate a first priority (p1) associated with the first reserved resources 515-a, the sidelink communications scheduled to be performed within the first resources 515-a, the second UE 115, or any combination thereof.

[0156] Similarly, the first UE 115 may receive a second SCI message 510-b from a third UE 115 (UE3), wherein the second SCI message 510-b indicates second reserved resources 515-a to be used by the third UE 115 for sidelink communications within the shared radio frequency spectrum 520-a. Figure 3 As shown, the second resource 515-a may be the same as the first resource 515-a reserved by the second UE 115, or may at least partially overlap in time and frequency with the first reserved resource 515-a reserved by the second UE 115. In some cases, the second SCI message 510-b may indicate a second priority (p2) associated with the second resource 515-b, the sidelink communication scheduled to be performed within the second resource 515-b, the third UE 115, or any combination thereof.

[0157] like Figure 5 As shown, the resources 515 reserved by the respective UEs 115 (UE2, UE3) may be associated with a symbol set 530, wherein the CPE 540 is used to indicate / determine the starting point of the respective reserved resources 515.

[0158] Now, reference will be made to the first example 535-a. As shown in the first example 535-a, the first resource 515-a reserved by the second UE 115 (UE2) via the first SCI message 510-a and the second resource 515-b reserved by the third UE 115 (UE3) via the second SCI message 510-b can be associated with the same CPE 540-a. Thus, since the resources 515-a, 515-b reserved by the respective UE 115 are associated with the same CPE 540-a, the first UE 115 (UE1) can be configured to identify a conflict and send a conflict indication to the UE 115 with a lower priority (e.g., send a conflict indication to UE2 when p1 < p2).

[0159] In comparison, now reference will be made to the second example 535-b. As shown in the second example 535-b, the first resource 515-c reserved by the second UE 115 (UE2) via the first SCI message 510-a and the second resource 515-d reserved by the third UE 115 (UE3) via the second SCI message 510-b can be associated with different CPEs 540-b, 540-c. Thus, since the resources 515-c, 515-d reserved by the respective UE 115 are associated with different CPEs 540, the first UE 115 (UE1) can be configured to identify that there is no conflict, or the LBT process 525 performed by the respective UE 115 is likely to resolve the overlapping resources 515 before any contention. Thus, the first UE 115 (UE1) can avoid sending a conflict indication based on determining that there is no conflict.

[0160] Figure 6 An example of a resource configuration 600 is illustrated that supports techniques for channel access awareness conflict determination for unlicensed sidelink bands in accordance with one or more aspects of the present disclosure. In some examples, aspects of the resource configuration 600 may implement or be implemented by aspects of the wireless communication system 100, wireless communication system 200, resource configurations 300, 400, 500, or any combination thereof.

[0161] In particular, the resource configuration 600 illustrates conflict determination that can be performed at the first UE 115 (UE1) based on multiple channel access parameters (e.g., based on the COT parameter + CPE parameter, based on the channel access type parameter + CPE parameter, etc.).

[0162] For example, in some cases, the first UE 115 (UE1) may determine whether a resource conflict exists / occurs when the following conditions are met: (1) the first resource (r1) reserved by the second UE 115 (UE2) overlaps with the second resource (r2) reserved by the third UE 115 (UE3), (2) condition A and / or condition B related to the above-mentioned received transmitted RSRP measurement are met, (3) the first reserved resource r1 is within the COT associated with (or shared to / with) the second UE 115 and the second reserved resource r2 is within the COT associated with (or shared to / with the third UE 115), and (4) the first reserved resource r1 and the second reserved resource r2 are associated with the same CPE.

[0163] In such a case, if the first UE 115 determines that there is a conflict based on the channel access type parameter, the first UE 115 may send a conflict indication to the UEs 115 (eg, UE2, UE3) having a lower priority transmission.

[0164] For example, referring to the first resource configuration 600-a, the first UE 115 (UE1) may receive a first SCI message 610-a from the second UE 115 (UE2), wherein the first SCI message 610-a indicates first reserved resources 615 to be used by the second UE 115 for sidelink communications within a shared radio frequency spectrum 620-a (e.g., an unlicensed band). In some cases, the first SCI message 610-a may indicate a first priority (p1) associated with the first reserved resources 615, the sidelink communications scheduled to be performed within the first resources 615, the second UE 115, or any combination thereof.

[0165] Similarly, the first UE 115 may receive a second SCI message 610-b from a third UE 115 (UE3), wherein the second SCI message 610-b indicates second reserved resources 615 to be used by the third UE 115 for sidelink communications within the shared radio frequency spectrum 620-a. Figure 6 As shown, the second resource 615 may be the same as the first resource 615 reserved by the second UE 115, or may at least partially overlap in time and frequency with the first reserved resource 615-a reserved by the second UE 115. In some cases, the second SCI message 610-b may indicate a second priority (p2) associated with the second resource 615, the sidelink communication scheduled to be performed within the second resource 615, the third UE 115, or any combination thereof.

[0166] like Figure 6As shown, the resources 615 reserved by the corresponding UE 115 (UE2, UE3) can be associated with the symbol set 640, where the CPE 635 is used to indicate / determine the starting point of the corresponding reserved resources 615. In addition, as Figure 6 shown, the first resource 615-a reserved by the second UE 115 (UE2) via the first SCI message 610-a and the second resource 615-b reserved by the third UE 115 (UE3) via the second SCI message 610-b can be associated with the same CPE 635-a.

[0167] In this example illustrated by the first resource configuration 600-a, the second UE 115 and the third UE 115 can be configured to perform the same LBT process 625-a before the reserved resources 615. In addition, the reserved resources 615 can be within the COT 630 associated with each of the corresponding UEs 115. In particular, the first resource 615-a reserved by the first SCI message 610-a is within the COT 630-a associated with (or shared with) the second UE 115 (UE2), and the second resource 615-b reserved by the second SCI message 610-b is within the COT 630-b associated with (or shared with) the third UE 115 (UE3). In addition, the reserved resources 615-a, 615-b are associated with the same CPE 635-a. Thus, because the resources 615 reserved by the corresponding UEs 115 are located within the COT 630 associated with the corresponding UEs 115, and because the resources 615 are associated with the same CPE 635-a, the first UE 115 (UE1) can be configured to identify the conflict and send a conflict indication to the UE 115 with a lower priority (e.g., send a conflict indication to UE2 when p1 < p2).

[0168] In an additional or alternative case, the first UE 115 (UE1) can determine whether a resource conflict exists / occurs when the following conditions are met: (1) the first resource (r1) reserved by the second UE 115 (UE2) overlaps with the second resource (r2) reserved by the third UE 115 (UE3), (2) condition A and / or condition B related to the received / sent RSRP measurement as described above are satisfied, (3) the first reserved resource r1 and the second reserved resource r2 are associated with the same channel access type, and (4) the first reserved resource r1 and the second reserved resource r2 are associated with the same CPE.

[0169] In such a case, if the first UE 115 determines that there is a conflict based on the channel access type parameter, the first UE 115 can send a conflict indication to the UE 115 that sent with a lower priority (e.g., UE2, UE3).

[0170] For example, referring to the second resource configuration 600-b, the first UE 115 (UE1) may receive a first SCI message 610-c from the second UE 115 (UE2), wherein the first SCI message 610-c indicates first reserved resources 615 to be used by the second UE 115 for sidelink communications within a shared radio frequency spectrum 620-b (e.g., an unlicensed band). In some cases, the first SCI message 610-c may indicate a first priority (p1) associated with the first reserved resources 615, the sidelink communications scheduled to be performed within the first resources 615, the second UE 115, or any combination thereof.

[0171] Similarly, the first UE 115 may receive a second SCI message 610-d from a third UE 115 (UE3), wherein the second SCI message 610-d indicates second reserved resources 615 to be used by the third UE 115 for sidelink communications within the shared radio frequency spectrum 620-b. Figure 6 As shown, the second resources 615 may be the same as the first resources 615 reserved by the second UE 115, or may at least partially overlap in time and frequency with the first reserved resources 615 reserved by the second UE 115. In some cases, the second SCI message 610-d may indicate a second priority (p2) associated with the second resources 615, the sidelink communication scheduled to be performed within the second resources 615, the third UE 115, or any combination thereof.

[0172] like Figure 6 As shown, the resources 615 reserved by the corresponding UE 115 (UE2, UE3) can be associated with a symbol set 640, wherein the CPE 635 is used to indicate / determine the starting point of the corresponding reserved resources 615. Figure 6 As shown, a first resource 615-a reserved by a second UE 115 (UE2) via a first SCI message 610-a and a second resource 615-b reserved by a third UE 115 (UE3) via a second SCI message 610-b may be associated with the same CPE 635-a.

[0173] In this example illustrated by the second resource configuration 600-b, the first resource reserved by the second UE 115 may be associated with a first LBT process 625-b of a first type (e.g., CAT 2), and the second resource reserved by the third UE 115 may be associated with a second LBT process 625-c of a second type (e.g., CAT 4). In other words, the resources may be associated with different channel access types (e.g., channel access type parameters). Therefore, because the resources 615 reserved by the corresponding UE 635 are associated with different channel access types (e.g., CAT 2 and CAT 3), the first UE 115 (UE1) may be configured to determine that there is no conflict between the resources 615 even if the resources 615 are associated with the same CPE 115-a. As a result, the first UE 115 (UE1) may avoid sending a conflict indication based on determining that there is no conflict.

[0174] Figure 7 An example of a resource configuration 700 that supports techniques for channel access aware conflict determination for an unlicensed sidelink band in accordance with one or more aspects of the present disclosure is illustrated. In some examples, aspects of the resource configuration 700 may implement or be implemented by aspects of the wireless communication system 100, the wireless communication system 200, the resource configurations 300, 400, 500, 600, or any combination thereof.

[0175] In particular, resource configuration 700 illustrates a contention determination that may be performed at a first UE 115 (UE1) based on a COT parameter and a number of conflicting resources.

[0176] As described previously herein, in the context of two overlapping resources (e.g. Figures 3 to 6 As shown in FIG. 1 ), if at least one of the first reserved resource r1 and the second reserved resource r2 is not within the COT of the corresponding UE 115 or is not within the shared COT of the corresponding UE 115, the first UE 115 may determine that there is no conflict. In addition, in the context of two overlapping resources, if the first reserved resource r1 and the second reserved resource r2 have different channel access types and / or different CPEs, the first UE 115 may determine that there is no conflict.

[0177] However, in some cases, such as Figure 7As shown, there may be more than two overlapping resources reserved by more than two UEs 115 (e.g., UE2, UE3, and UE4). As the number / quantity of overlapping resources increases, the probability that the overlapping resources will cause a conflict / interference increases (e.g., the LBT process will be less likely to resolve the overlapping resources). Thus, in the case of more than two overlapping resources, the first UE 115 (UE1) can be configured to indicate resource conflicts based on the number of overlapping resources regardless of whether the potentially conflicting resources are within or outside the COT, whether the overlapping resources have the same channel access type and / or CPE, etc.

[0178] For example, referring to the first resource configuration 700, the first UE 115 (UE1) may receive a first SCI message 710-a from the second UE 115 (UE2), wherein the first SCI message 710-a indicates first reserved resources 715 to be used by the second UE 115 for sidelink communications within a shared radio frequency spectrum 720 (e.g., an unlicensed band). In some cases, the first SCI message 710-a may indicate a first priority (p1) associated with the first reserved resources 715, the sidelink communications scheduled to be performed within the first resources 715, the second UE 115, or any combination thereof.

[0179] Similarly, the first UE 115 may receive a second SCI message 710-b and a third SCI message 710-c from the third UE 115 (UE3) and the fourth UE 115 (UE4), respectively. The SCI messages 710-b, 710-c may indicate second reserved resources 715 and third reserved resources 715 to be used by the third UE 115 (UE3) and the fourth UE 115 (UE4), respectively, for sidelink communications within the shared radio frequency spectrum 720. Figure 4 As shown, the second resource 715, the third resource 715, or both may be the same as the first resource 715 reserved by the second UE 115, or may overlap at least partially in time and frequency with the first reserved resource 715 reserved by the second UE 115. In some cases, the second SCI message 710-b may indicate a second priority (p2) associated with the second resource 715, the sidelink communication scheduled to be performed within the second resource 715, the third UE 115 (UE3), or any combination thereof. Similarly, the third SCI message 710-c may indicate a third priority (p3) associated with the third resource 715, the sidelink communication scheduled to be performed within the third resource 715, the fourth UE 115 (UE4), or any combination thereof.

[0180] In this example, the second UE 115 (UE2), the third UE 115 (UE3), and the fourth UE 115 (UE4) may be configured to perform LBT processes 725-a, 725-b, and 725-c, respectively. In addition, the resources reserved by the second UE 115 (UE2), the third UE 115 (UE3), and the fourth UE 115 (UE4) may be associated with COTs 730-a, 730-b, and 730-c, respectively.

[0181] In this example, the first resource r1 reserved by the first SCI message 710-a is within the COT 730-a, while the second resource r2 reserved by the second SCI message 710-b is outside the COT 730-b. Thus, according to the above rules / conditions, the first UE 115 may not determine the conflict between overlapping resources (due to the second resource being outside the COT). Similarly, the first resource r1 reserved by the first SCI message 710-a is within the COT 730-a, while the third resource r3 reserved by the third SCI message 710-c is outside the COT 730-c. Therefore, according to the above rules / conditions, the first UE 115 may not determine the conflict between the first overlapping resource and the third overlapping resource (due to the third resource r3 being outside the COT). In addition, the second resource r2 and the third resource r2) reserved by the second SCI message 710-b and the third SCI message 710-c, respectively, are both outside the corresponding COTs 730-b and 730-c. Thus, the first UE 115 may determine that there is no conflict between the second resource and the third resource.

[0182] In this example, the first UE 115 may determine that there is no conflict between any two pairs of overlapping resources (e.g., no conflict between r1 and r2, no conflict between r1 and r3, no conflict between r2 and r3). ​​However, due to the fact that there are three overlapping resources (r1, r2, r3), the first UE 115 may still determine that there is a conflict because the number of overlapping resources exceeds a certain threshold (because the probability that overlapping resources will cause a conflict increases as the number of overlapping resources increases).

[0183] In this regard, in some implementations, the first UE 115 (UE1) may determine whether a resource conflict exists / occurs when the following conditions are met: (1) a first resource (r1) reserved by the second UE 115 (UE2) and more than one additional reserved resources (r2, r3, ..., r4) reserved by additional UEs 115 (e.g., UE3, UE4, ..., UEn) are / are not necessarily associated with the first resource (r1) reserved by the second UE 115 (UE2). n ) overlap, (2) at least one of the following conditions C or D is met, and (3) the number of overlapping resources that meet the above conditions is greater than a certain threshold, where the threshold can be fixed or configured.

[0184] In some aspects, if the RSRP measurement of the transmission received by the first UE 115 (UE1) is above a threshold, then the above-mentioned condition C may be satisfied. For example, if the first UE 115 (UE1) is the intended recipient of the PSSCH message of the reserved resources of the second UE 115 (UE2), then the RSRP of the signal received from each of the additional UEs 115 (UE3, UE4) is above a threshold (Th(p j ,p i )) condition C can be satisfied, where p j is the priority of the second UE 115, and p i is the priority of the i-th UE 115 among the plurality of UEs 115 that have reserved overlapping resources. As another example, if the first UE 115 (UE1) is the intended recipient of the PSSCH message in the reserved resources of the third UE 115 (UE3) among the plurality of UEs 115 that have reserved overlapping resources, then when the RSRP of the signal received from each of the plurality of UEs 115 (e.g., UE2, UE4) excluding the third UE 115 (UE3) is higher than the threshold value Th (p j ,p i ) condition C can be satisfied, where p j is the priority of the third UE 115 (UE3), p i is the priority of the i-th UE 115 among the second UE 115 and the plurality of UEs 115 (excluding the third UE 115) that have reserved overlapping resources. In this example, the threshold (Th(p j ,p i )) can be configured through RRC.

[0185] In some aspects, the above-mentioned condition D may be satisfied when the difference in RSRP measurements between the conflicting transmissions is above a threshold. For example, if a first UE 115 (UE1) is the intended recipient of a PSSCH message in resources reserved by a second UE 115 (UE2), then the RSRP for each of the multiple UEs 115 that have reserved overlapping resources may be greater than the threshold. j >RSRP i +Delta_Th i Condition D can be satisfied when RSRP i and RSRP jis the RSRP measurement performed by the first UE 115 (UE1) on signals received from the second UE 115 (UE2) and the j-th UE 115 among multiple UEs 115 that have reserved overlapping resources. As another example, if the first UE 115 (UE1) is the intended receiver of the PSSCH message in the reserved resources of the third UE 115 (UE3) among multiple UEs 115 that have reserved overlapping resources, the first UE 115 (UE1) may determine a resource conflict (e.g., condition D is satisfied) when j >RSRP i +Delta_Th i where RSRP i and RSRP j are the RSRP measurements performed by the first UE 115 on signals received from the second UE 115 (UE2) and the j-th UE 115 among multiple UEs 115 (excluding the third UE 115) that have reserved overlapping resources. In this example, Delta_Th i can be configured via RRC, which can be the same for different priorities or can be priority-specific.

[0186] In this example, it is assumed that the threshold for overlapping resources is 2. When receiving the second SCI message 710-b, the first UE 115 can determine that there are only two overlapping resources 715 (e.g., the first and second resources 715 reserved by the first SCI message 710-a and the second SCI message 710-b, respectively). Thus, the first UE 115 can determine that the number of overlapping resources does not exceed the threshold 2 and can therefore determine that there is no conflict. However, after receiving the third SCI message 710-c that reserves the third resource 715, the first UE 115 can determine that there are three overlapping resources 715 (e.g., the first and second resources 715 reserved by the first SCI message 710-a, the second SCI message 710-b, and the third SCI message 710-c, respectively). Thus, the first UE 115 can determine that the number of overlapping resources 715 is greater than the threshold and can therefore determine that there is a conflict, and can send a conflict indication to the UE 115 with the lowest priority (e.g., send a conflict indication to UE2 and UE3 when p1 < p2 < p3).

[0187] Figure 8An example of a process flow 800 for supporting techniques for channel access awareness conflict determination for an unlicensed sidelink band in accordance with one or more aspects of the present disclosure is illustrated. In some examples, aspects of the process flow 800 may implement or be implemented by aspects of the wireless communication system 100, the wireless communication system 200, the resource configuration 300, 400, 500, 600, 700, or any combination thereof. For example, the process flow 800 illustrates enabling the first UE 115-d to perform a channel access awareness conflict determination as described in reference to FIG. Figures 1 to 8 Signaling and configuration to identify resource conflicts between resources reserved by other UEs 115 based on one or more channel access parameters as described.

[0188] Process flow 800 includes a first UE 115-a, a second UE 115-b, and a third UE 115-c, which may be examples of wireless devices as described herein. Figure 8 The first UE 115-d, the second UE 115-e and the third UE 115-f illustrated in FIG. 1 may be respectively Figure 2 An example of a first UE 115-a, a second UE 115-b and a third UE 115-c is illustrated in FIG.

[0189] In some examples, the operations illustrated in process flow 800 may be performed by hardware (e.g., including circuits, processing blocks, logic components, and other components), code executed by a processor (e.g., software or firmware), or any combination thereof. The following alternative examples may be implemented in which some of the steps are performed in an order different from that described or not performed at all. In some cases, the steps may include additional features not mentioned below, or additional steps may be added.

[0190] At 805, the first UE 115-d may receive capability information / signaling from the second UE 115-e, the third UE 115-f, or both indicating whether the second UE 115-e and / or the third UE 115-f is capable of receiving a conflict indication. In some cases, the capability information may be communicated via an SCI message. In other words, the UE 115-e, 115-f may broadcast or otherwise indicate whether the UE 115-e, 115-f is capable of receiving an inter-UE coordination message (e.g., a PSFCH message, an SCI message) indicating a source conflict.

[0191] At 810, the first UE 115-d may receive a first SCI message (and / or another sidelink control message) from the second UE 115-e, wherein the first SCI message indicates a first reserved resource to be used by the second UE 115-e for sidelink communications within a shared radio frequency band (e.g., an unlicensed frequency band). In some cases, the first SCI message may indicate a first priority (p1) associated with the reserved first resource, the sidelink communications scheduled to be performed within the first resource, the second UE 115-e, or any combination thereof.

[0192] At 815, the first UE 115-d may receive a second SCI message (and / or another side link control message) from the third UE 115-f, wherein the second SCI message indicates a second reserved resource to be used by the third UE 115-f for side link communications within the shared radio frequency band. In this example, the second resources reserved by the third UE 115-f may overlap at least partially in time and frequency with the first resources reserved by the second UE 115-e. In some cases, the second SCI message may indicate a second priority (p2) associated with the reserved second resources, the side link communications scheduled to be performed within the second resources, the third UE 115-f, or any combination thereof.

[0193] At 815, the first UE 115-d may determine whether there is a conflict between the first resource reserved by the second UE 115-e and the second resource reserved by the third UE 115-f. In particular, the first UE 115-d may determine whether there is a conflict based on whether the overlapping resources are likely to cause a conflict or whether it is resolved via an LBT process at the respective UEs 115-e, 115-f. In this regard, the first UE 115-d may determine whether there is a conflict based on receiving the first SCI message at 810, receiving the second SCI message at 815, or both.

[0194] In some aspects, the first UE 115-d determines whether a conflict exists based on the first resource and the second resource at least partially overlapping each other in time and frequency. Additionally, the first UE 115-d determines whether a conflict exists based on a signal strength associated with a signal (e.g., an SCI message) received from the second UE 115-e, the third UE 115-f, or both.

[0195] In addition, the first UE 115-d determines whether a conflict exists based on one or more additional channel access parameters associated with communications at / with the second UE 115-e, the third UE 115-f, or both. The channel access parameters used to perform conflict determination may include, but are not limited to, COT parameters (e.g., whether the reserved resources fall within the COT of the corresponding UE 115-e, 115-f), channel access type parameters (e.g., what type of LBT process will be performed by UE 115-e, 115-f), CPE parameters (e.g., when transmission within the conflicting reserved resources is scheduled to start), etc. As previously described herein, the channel access parameters may be used by the first UE 115-d to determine the relative likelihood or probability that overlapping resources are likely to cause a conflict (e.g., the relative probability that the LBT process will resolve the potential conflict before it conflicts).

[0196] For example, in some cases, such as Figure 3 As shown, the first UE 115-d may determine whether there is a conflict based on COT parameters associated with the second UE 115-e, the third UE 115-f, or both. In this example, if the first resource reserved by the second UE 115-e is in the COT associated with the second UE 115-e (or shared to / with the second UE 115-e), and if the second resource reserved by the third UE 115-f is in the COT associated with the third UE 115-f (or shared to / with the third UE 110-f), the first UE 110-d may determine that there is a conflict. In other words, if at least one of the first resource or the second resource is not within the COT of the corresponding corresponding UE 115-e, 115-f, the first UE 115-d may be configured to determine that there is no conflict (or that the LBT process performed at the corresponding UE 115-e, 115-f is likely to resolve the potential conflict before it conflicts).

[0197] As another example, in some cases, such as Figure 4As shown, the first UE 115-d determines whether there is a conflict based on a channel access type parameter associated with the second UE 115-e, the third UE 115-f, or both. In this example, if the first resource reserved by the second UE 115-e and the second resource reserved by the third UE 115-f are associated with the same channel access type (e.g., both are CAT 2 16ms, both are CAT 2 25ms, both are CAT 4, etc.), the first UE 115-d may determine that there is a conflict. In other words, if the first channel access type associated with the first resource reserved by the second UE 115-e and the second channel access type associated with the second resource reserved by the third UE 115-f are different, the first UE 115-d may be configured to determine that there is no conflict (or that the LBT process performed at the respective UEs 115-e, 115-f is likely to resolve the potential conflict before it conflicts).

[0198] As another example, in some cases, such as Figure 5 As shown, the first UE 115-d determines whether a conflict exists based on CPE parameters associated with a transmission to be performed by the second UE 115-e, the third UE 115-f, or both. In this example, if the first resource reserved by the second UE 115-e and the second resource reserved by the third UE 115-f are associated with the same CPE, the first UE 115-d determines that a conflict exists. In other words, if the first CPE associated with the first resource and the second CPE associated with the second resource are different (for example, the transmission within the resource is scheduled to start at different times), the first UE 115-d can be configured to determine that there is no conflict (or that the LBT process performed by the corresponding UE 115-e, 115-f is likely to resolve the potential conflict before it conflicts).

[0199] As previously noted herein, in some cases, the first UE 115-d may be configured to evaluate whether a conflict exists based on one or more channel access parameters (e.g., Figure 6 In addition, in some cases, the first UE 115-d may be configured to evaluate whether there is a conflict (e.g., how many UEs 115 have reserved overlapping resources) based on how many overlapping resources there are (e.g., how many UEs 115 have reserved overlapping resources). Figure 7 shown).

[0200] In the event that the first UE 115-d determines that there is no conflict (or that overlapping resources are unlikely to cause a conflict), the first UE 115-d may avoid sending a conflict indication. Conversely, in the event that the first UE 115-d determines that there is a conflict (e.g., overlapping resources are likely to cause a conflict), the process flow 800 may proceed to step 825.

[0201] At 825, the first UE 115-e may send an indication of the identified conflict to the second UE 115-e, the third UE 115-f, or both. The indication of the conflict may be sent via an SCI message, a PSFCH message, or the like.

[0202] For example, in a situation where a first resource / transmission reserved or scheduled by a second UE 115-e is associated with a lower priority (e.g., p2>p1) than a second resource / transmission reserved or scheduled by a third UE 115-f, the first UE 115-d may send an indication of a conflict to the second UE 115-e based on the second UE 115-e being associated with the lower priority.

[0203] The first UE 115-d may send an indication of a conflict based on receiving capability information at 805, receiving a first SCI message at 810, receiving a second SCI message at 815, determining the presence of a conflict at 820, or any combination thereof. For example, the first UE 115-d may send an indication of a conflict based on the first reserved resources overlapping with the second reserved resources in time and frequency, signal strength of signals received from the second UE 115-e, the third UE 115-f, or both, and at least one channel access parameter used to communicate with the second UE 115-e, the third UE 115-f, or both.

[0204] At 830, the second UE 115-e may select new resources (e.g., third resources) for performing sidelink communications. In particular, the second UE 115-e may select the new resources based on receiving the indication of the conflict from the first UE 115-d at 825. In some cases, the second UE 115-e may send another SCI message reserving the newly selected resources to enable other UEs 115 to perform conflict determination for the new resources as described herein.

[0205] At 835, the third UE 115-f may perform channel sensing as part of the LBT process. In other words, the third UE 115-f may perform channel sensing during the time interval before reserving the second resources via the second SCI message at 815 in order to gain access to the shared radio frequency spectrum and perform sidelink communication within the second reserved resources.

[0206] At 840, the third UE 115-f may perform sidelink communications within the second resources reserved via the second SCI message at 815. Figure 8As shown, in the case where the first UE 115-d is the intended recipient of the side link message within the second reserved resources, the third UE 115-f may send the side link message to the first UE 115-d within the second reserved resources. In addition, the third UE 115-f may perform (e.g., send) the side link message at 840 based on performing (e.g., clearing) the LBT process at 835.

[0207] At 845, the second UE 115-e may perform sidelink communications within the third resource selected at 830. For example, Figure 8 As shown, in the case where the first UE 115-d is the intended recipient of the side link message within the third reserved resource, the second UE 115-e may send the side link message to the first UE 115-d within the third reserved resource. In addition, the second UE 115-e may perform (e.g., send) the side link message based on performing (e.g., clearing) the LBT process before the third reserved resource at 845. In this regard, the second UE 115-e may perform side link communication based on receiving a conflict indication at 825, reselecting the third resource at 830, performing the LBT process, or any combination thereof.

[0208] The techniques described herein may enable UE 115 to identify and resolve potential conflicts within a shared radio frequency band, such as an unlicensed side link frequency band. In particular, the techniques described herein may utilize channel access parameters associated with side link communications between devices in order to determine the relative likelihood that an LBT process will resolve a potential conflict. In this regard, the techniques described herein may enable UE 115 to determine whether a conflict exists and whether it is desired that UE 115 send a conflict indication to help avoid the conflict. Thus, aspects of the present disclosure may reduce interference and noise within a shared radio frequency band, and may result in more efficient resource utilization within the shared radio frequency band.

[0209] Fig. 9 A block diagram 900 of a device 905 supporting techniques for channel access awareness conflict determination for an unlicensed sidelink band according to one or more aspects of the present disclosure is shown. The device 905 may be an example of aspects of a UE 115 as described herein. The device 905 may include a receiver 910, a transmitter 915, and a communication manager 920. The device 905 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0210] The receiver 910 may provide a means for receiving information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information related to techniques for channel access awareness conflict determination for unlicensed sidelink bands). The information may be communicated to other components of the device 905. The receiver 910 may utilize a single antenna or a set of multiple antennas.

[0211] The transmitter 915 may provide means for transmitting signals generated by other components of the device 905. For example, the transmitter 915 may transmit information such as packets associated with various information channels (e.g., control channels, data channels, information channels related to techniques for channel access awareness conflict determination for unlicensed sidelink bands), user data, control information, or any combination thereof. In some examples, the transmitter 915 may be co-located with the receiver 910 in a transceiver module. The transmitter 915 may utilize a single antenna or a set of multiple antennas.

[0212] The communication manager 920, the receiver 910, the transmitter 915, or various combinations thereof or various components thereof may be examples of means for performing various aspects of the techniques for channel access awareness conflict determination for an unlicensed sidelink band as described herein. For example, the communication manager 920, the receiver 910, the transmitter 915, or various combinations thereof or components thereof may support methods for performing one or more of the functions described herein.

[0213] In some examples, the communication manager 920, the receiver 910, the transmitter 915, 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).

[0214] Additionally or alternatively, in some examples, the communication manager 920, the receiver 910, the transmitter 915, 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 920, the receiver 910, the transmitter 915, 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.

[0215] In some examples, the communication manager 920 may be configured to perform various operations (e.g., receive, obtain, monitor, output, transmit) using or otherwise cooperating with the receiver 910, the transmitter 915, or both. For example, the communication manager 920 may receive information from the receiver 910, transmit information to the transmitter 915, or be integrated in conjunction with the receiver 910, the transmitter 915, or both to obtain information, output information, or perform various other operations as described herein.

[0216] The communication manager 920 may support wireless communication at a first UE according to an example as disclosed herein. For example, the communication manager 920 may be configured to or otherwise support a component for receiving a first side link control message indicating a first reserved resource to be used by the second UE for side link communication in a shared radio frequency spectrum band from a second UE. The communication manager 920 may be configured to or otherwise support a component for receiving a second side link control message indicating a second reserved resource to be used by the third UE for side link communication in a shared radio frequency spectrum band from a third UE. The communication manager 920 may be configured to or otherwise support a component for sending an indication of a conflict between a first reserved resource indicated by a first side link control message and a second reserved resource indicated by a second side link control message based on the first reserved resource overlapping with the second reserved resource in time and frequency, the signal strength of a signal received from the second UE, the third UE, or both, and at least one channel access parameter for communicating with the second UE, the third UE, or both.

[0217] By including or configuring a communication manager 920 according to the examples described herein, the device 905 (e.g., a processor that controls or otherwise couples with a receiver 910, a transmitter 915, a communication manager 920, or a combination thereof) may support techniques that enable a UE 115 to identify and resolve potential conflicts within a shared radio band such as an unlicensed sidelink band. In particular, the techniques described herein may utilize channel access parameters associated with sidelink communications between devices in order to determine the relative likelihood that an LBT process will resolve a potential conflict. In this regard, the techniques described herein may enable a UE 115 to determine whether a conflict exists and whether it is desired that the UE 115 send a conflict indication to help avoid the conflict. Thus, aspects of the present disclosure may reduce interference and noise within a shared radio band and may result in more efficient resource utilization within the shared radio band.

[0218] Fig.10 A block diagram 1000 of a device 1005 supporting techniques for channel access awareness conflict determination for an unlicensed sidelink band according to one or more aspects of the present disclosure is shown. The device 1005 may be an example of aspects of the device 905 or UE 115 as described herein. The device 1005 may include a receiver 1010, a transmitter 1015, and a communication manager 1020. The device 1005 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0219] The receiver 1010 may provide a means for receiving information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information related to techniques for channel access awareness conflict determination for unlicensed sidelink bands). The information may be communicated to other components of the device 1005. The receiver 1010 may utilize a single antenna or a set of multiple antennas.

[0220] The transmitter 1015 may provide means for transmitting signals generated by other components of the device 1005. For example, the transmitter 1015 may transmit information such as packets associated with various information channels (e.g., control channels, data channels, information channels related to techniques for channel access awareness conflict determination for unlicensed sidelink bands), user data, control information, or any combination thereof. In some examples, the transmitter 1015 may be co-located with the receiver 1010 in a transceiver module. The transmitter 1015 may utilize a single antenna or a set of multiple antennas.

[0221] The device 1005 or its various components may be examples of components for performing various aspects of the technology for channel access awareness conflict determination for unlicensed side link bands as described herein. For example, the communication manager 1020 may include a side link message reception manager 1025, a conflict indication transmission manager 1030, or any combination thereof. The communication manager 1020 may be an example of various aspects of the communication manager 920 as described herein. In some examples, the communication manager 1020 or its various components may be configured to use or otherwise cooperate with the receiver 1010, the transmitter 1015, or both to perform various operations (e.g., receive, obtain, monitor, output, send). For example, the communication manager 1020 may receive information from the receiver 1010, transmit information to the transmitter 1015, or be integrated with the receiver 1010, the transmitter 1015, or both to obtain information, output information, or perform various other operations as described herein.

[0222] The communication manager 1020 may support wireless communication at a first UE according to an example as disclosed herein. The sidelink message reception manager 1025 may be configured to or otherwise support a component for receiving a first sidelink control message indicating a first reserved resource to be used by the second UE for sidelink communication in a shared radio frequency spectrum band from a second UE. The sidelink message reception manager 1025 may be configured to or otherwise support a component for receiving a second sidelink control message indicating a second reserved resource to be used by the third UE for sidelink communication in a shared radio frequency spectrum band from a third UE. The conflict indication transmission manager 1030 may be configured to or otherwise support a component for transmitting an indication of a conflict between a first reserved resource indicated by a first sidelink control message and a second reserved resource indicated by a second sidelink control message based on the overlap of the first reserved resource with the second reserved resource in time and frequency, the signal strength of a signal received from the second UE, the third UE, or both, and at least one channel access parameter for communicating with the second UE, the third UE, or both.

[0223] Fig.11A block diagram 1100 of a communication manager 1120 supporting techniques for channel access aware conflict determination for an unlicensed side link band according to one or more aspects of the present disclosure is shown. The communication manager 1120 may be an example of aspects of the communication manager 920, the communication manager 1020, or both as described herein. The communication manager 1120 or its various components may be examples of components for performing various aspects of the techniques for channel access aware conflict determination for an unlicensed side link band as described herein. For example, the communication manager 1120 may include a side link message reception manager 1125, a conflict indication transmission manager 1130, a COT manager 1135, a channel access type manager 1140, a CPE manager 1145, a conflict determination manager 1150, a capability signaling reception manager 1155, or any combination thereof. Each of these components may communicate with each other directly or indirectly (e.g., via one or more buses).

[0224] The communication manager 1120 may support wireless communication at a first UE according to an example as disclosed herein. The sidelink message reception manager 1125 may be configured to or otherwise support a component for receiving a first sidelink control message from a second UE indicating a first reserved resource to be used by the second UE for sidelink communication in a shared radio frequency spectrum band. In some examples, the sidelink message reception manager 1125 may be configured to or otherwise support a component for receiving a second sidelink control message from a third UE indicating a second reserved resource to be used by the third UE for sidelink communication in a shared radio frequency spectrum band. The conflict indication transmission manager 1130 may be configured to or otherwise support a component for transmitting an indication of a conflict between a first reserved resource indicated by a first sidelink control message and a second reserved resource indicated by a second sidelink control message based on the overlap of the first reserved resource with the second reserved resource in time and frequency, the signal strength of a signal received from the second UE, the third UE, or both, and at least one channel access parameter for communicating with the second UE, the third UE, or both.

[0225] In some examples, the COT manager 1135 may be configured to or otherwise support components for determining that a conflict exists based on first reserved resources being within a first COT associated with a second UE, shared with a second UE, or both, and based on second reserved resources being within a second COT associated with a third UE, shared with a third UE, or both, wherein at least one channel access parameter includes a COT parameter.

[0226] In some examples, the channel access type manager 1140 may be configured to or otherwise support components for determining that a conflict exists based on a first channel access type associated with a first reserved resource being the same channel access type as a second channel access type associated with a second reserved resource, wherein at least one channel access parameter includes a channel access type parameter.

[0227] In some examples, the CPE manager 1145 may be configured or otherwise support components for determining that a conflict exists based on a first CPE associated with a first reserved resource being the same CPE as a second CPE associated with a second reserved resource, wherein at least one channel access parameter includes a CPE parameter.

[0228] In some examples, the COT manager 1135 may be configured to or otherwise support components for determining that a conflict exists based on the first reserved resources being within a first COT associated with, shared with, or both a second UE and based on the second reserved resources being within a second COT associated with, shared with, or both a third UE and based on the first CPE associated with the first reserved resources being the same CPE as the second CPE associated with the second reserved resources, wherein at least one channel access parameter includes a COT parameter and a CPE parameter.

[0229] In some examples, the channel access type manager 1140 may be configured to or otherwise support components for determining that a conflict exists based on a first channel access type associated with a first reserved resource being the same channel access type as a second channel access type associated with a second reserved resource and based on a first CPE associated with the first reserved resource being the same CPE as a second CPE associated with the second reserved resource, wherein at least one channel access parameter includes a channel access type parameter and a CPE parameter.

[0230] In some examples, the conflict determination manager 1150 may be configured to or otherwise support components for determining that a conflict exists based on a number of conflicting resources satisfying a number threshold, wherein the number of conflicting resources is identified based on whether a signal strength of a signal received on each corresponding resource in a set of multiple resources for a set of multiple UEs coordinated by the first UE satisfies a signal strength threshold.

[0231] In some examples, conflict determination manager 1150 may be configured or otherwise support components for determining that a conflict exists between the first reserved resources and the second reserved resources based on a first signal strength associated with a first signal received from the second UE satisfying a signal strength threshold.

[0232] In some examples, conflict determination manager 1150 may be configured to or otherwise support components for determining that a conflict exists between first reserved resources and second reserved resources based on a difference between a first signal strength associated with a first signal received from a second UE and a second signal strength associated with a second signal received from a third UE satisfying a signal strength difference threshold.

[0233] In some examples, the conflict indication sending manager 1130 may be configured to or otherwise support components for sending an indication of a conflict to a second UE based on a first transmission indicated by a first side link control message by the second UE having a lower priority than a second transmission indicated by a second side link control message by a third UE.

[0234] In some examples, the sidelink message reception manager 1125 may be configured to or otherwise support components for receiving a third sidelink control message from the second UE in response to an indication of a conflict, the third sidelink control message identifying a third reserved resource different from the first reserved resource to be used by the second UE for sidelink communications.

[0235] In some examples, the capability signaling reception manager 1155 may be configured to or otherwise support components for receiving capability signaling from the second UE via an SCI message indicating that the second UE is capable of receiving an indication of a conflict. In some examples, the conflict indication transmission manager 1130 may be configured to or otherwise support components for transmitting an indication of a conflict to the second UE via a physical sidelink feedback channel based on receiving the capability signaling.

[0236] Fig.12 A diagram of a system 1200 including a device 1205 that supports techniques for channel access awareness conflict determination for an unlicensed sidelink band according to one or more aspects of the present disclosure is shown. The device 1205 may be an example of a device 905, a device 1005, or a UE 115 as described herein, or include components of these devices. The device 1205 may communicate (e.g., wirelessly) with one or more network entities 105, one or more UEs 115, or any combination thereof. The device 1205 may include components for two-way voice and data communications, including components for sending and receiving communications, such as a communication manager 1220, an input / output (I / O) controller 1210, a transceiver 1215, an antenna 1225, a memory 1230, a code 1235, and a processor 1240. These components may be electronically communicated or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more buses (e.g., bus 1245).

[0237] I / O controller 1210 can manage input and output signals for device 1205. I / O controller 1210 can also manage peripheral devices that are not integrated into device 1205. In some cases, I / O controller 1210 can represent a physical connection or port to an external peripheral device. In some cases, I / O controller 1210 can utilize an operating system such as or another known operating system. Additionally or alternatively, I / O controller 1210 may represent or interact with a modem, keyboard, mouse, touch screen, or similar device. In some cases, I / O controller 1210 may be implemented as part of a processor such as processor 1240. In some cases, a user may interact with device 1205 via I / O controller 1210 or via hardware components controlled by I / O controller 1210.

[0238] In some cases, the device 1205 may include a single antenna 1225. However, in some other cases, the device 1205 may have more than one antenna 1225, which may be capable of concurrently transmitting or receiving multiple wireless transmissions. The transceiver 1215 may communicate bidirectionally via one or more antennas 1225, a wired link, or a wireless link as described herein. For example, the transceiver 1215 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 1215 may also include a modem for modulating packets, providing the modulated packets to one or more antennas 1225 for transmission, and demodulating packets received from one or more antennas 1225. The transceiver 1215, or the transceiver 1215 and one or more antennas 1225 may be examples of transmitters 915, transmitters 1015, receivers 910, receivers 1010, or any combination thereof or any components thereof as described herein.

[0239] Memory 1230 may include random access memory (RAM) and read-only memory (ROM). Memory 1230 may store computer-readable, computer-executable code 1235 including instructions that, when executed by processor 1240, cause device 1205 to perform various functions described herein. Code 1235 may be stored in a non-transitory computer-readable medium, such as system memory or another type of memory. In some cases, code 1235 may not be directly executable by processor 1240, but may (e.g., when compiled and executed) cause a computer to perform the functions described herein. In some cases, memory 1230 may 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.

[0240] Processor 1240 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, processor 1240 may be configured to operate a memory array using a memory controller. In some other cases, the memory controller may be integrated into processor 1240. Processor 1240 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1230) so that device 1205 performs various functions (e.g., functions or tasks supporting techniques for channel access awareness conflict determination for unlicensed side link bands). For example, device 1205 or a component of device 1205 may include processor 1240 and memory 1230 coupled to or coupled to processor 1240, and processor 1240 and memory 1230 are configured to perform various functions described herein.

[0241] The communication manager 1220 may support wireless communication at a first UE according to an example as disclosed herein. For example, the communication manager 1220 may be configured to or otherwise support a component for receiving a first side link control message from a second UE indicating a first reserved resource to be used by the second UE for side link communication in a shared radio frequency spectrum band. The communication manager 1220 may be configured to or otherwise support a component for receiving a second side link control message from a third UE indicating a second reserved resource to be used by the third UE for side link communication in a shared radio frequency spectrum band. The communication manager 1220 may be configured to or otherwise support a component for sending an indication of a conflict between a first reserved resource indicated by the first side link control message and a second reserved resource indicated by the second side link control message based on the first reserved resource overlapping with the second reserved resource in time and frequency, the signal strength of the signal received from the second UE, the third UE, or both, and at least one channel access parameter for communicating with the second UE, the third UE, or both.

[0242] By including or configuring a communication manager 1220 according to an example as described herein, the device 1205 may support techniques that enable UE 115 to identify and resolve potential conflicts within a shared radio band such as an unlicensed sidelink band. In particular, the techniques described herein may utilize channel access parameters associated with sidelink communications between devices in order to determine the relative likelihood that an LBT process will resolve a potential conflict. In this regard, the techniques described herein may enable UE 115 to determine whether a conflict exists and whether it is desired that UE 115 send a conflict indication to help avoid the conflict. Thus, aspects of the present disclosure may reduce interference and noise within a shared radio band, and may result in more efficient resource utilization within the shared radio band.

[0243] In some examples, the communication manager 1220 may be configured to perform various operations (e.g., receive, monitor, transmit) using or otherwise cooperating with the transceiver 1215, one or more antennas 1225, or any combination thereof. Although the communication manager 1220 is illustrated as a separate component, in some examples, one or more functions described with reference to the communication manager 1220 may be supported or performed by the processor 1240, the memory 1230, the code 1235, or any combination thereof. For example, the code 1235 may include instructions that can be executed by the processor 1240 to cause the device 1205 to perform various aspects of the techniques for channel access awareness conflict determination for an unlicensed sidelink band as described herein, or the processor 1240 and the memory 1230 may be otherwise configured to perform or support such operations.

[0244] Fig.13 A flow chart illustrating a method 1300 for supporting techniques for channel access awareness conflict determination for an unlicensed sidelink frequency band according to one or more aspects of the present disclosure is shown. The operations of the method 1300 may be implemented by a UE or a component thereof as described herein. For example, the operations of the method 1300 may be implemented by a UE or a component thereof as described in reference to Figures 1 to 12 The described UE 115 may be performed. 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.

[0245] At 1305, the method may include receiving a first sidelink control message from a second UE indicating a first reserved resource to be used by the second UE for sidelink communication in a shared radio frequency spectrum band. The operations of 1305 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1305 may be performed as described in reference to Fig.11 The side link message receiving manager 1125 is executed.

[0246] At 1310, the method may include receiving a second sidelink control message from a third UE indicating second reserved resources to be used by the third UE for sidelink communications in the shared radio frequency spectrum band. The operations of 1310 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1310 may be performed as described in reference to Fig.11 The side link message receiving manager 1125 is executed.

[0247] At 1315, the method may include sending an indication of a conflict between the first reserved resource indicated by the first sidelink control message and the second reserved resource indicated by the second sidelink control message based on the first reserved resource overlapping the second reserved resource in time and frequency, the signal strength of the signal received from the second UE, the third UE, or both, and at least one channel access parameter for communicating with the second UE, the third UE, or both. The operations of 1315 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1315 may be performed as described in reference to Fig.11 The described conflict indication is sent to the manager 1130 for execution.

[0248] Fig.14 A flow chart illustrating a method 1400 for supporting techniques for channel access awareness conflict determination for an unlicensed sidelink band according to one or more aspects of the present disclosure is shown. The operations of the method 1400 may be implemented by a UE or components thereof as described herein. For example, the operations of the method 1400 may be implemented by a UE or components thereof as described in reference to Figures 1 to 12 The described UE 115 may be performed. 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.

[0249] At 1405, the method may include receiving a first sidelink control message from a second UE indicating a first reserved resource to be used by the second UE for sidelink communication in a shared radio frequency spectrum band. The operations of 1405 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1405 may be performed as described in reference to Fig.11 The side link message receiving manager 1125 is executed.

[0250] At 1410, the method may include receiving a second sidelink control message from a third UE indicating second reserved resources to be used by the third UE for sidelink communications in the shared radio frequency spectrum band. The operations of 1410 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1410 may be performed as described in reference to Fig.11 The side link message receiving manager 1125 is executed.

[0251] At 1415, the method may include determining that there is a conflict based on the first reserved resource being within a first COT associated with the second UE, shared with the second UE, or both and based on the second reserved resource being within a second COT associated with the third UE, shared with the third UE, or both. The operations of 1415 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1415 may be performed as described in reference to Fig.11 The COT manager 1135 is used to execute.

[0252] At 1420, the method may include sending an indication of a conflict between a first reserved resource indicated by the first sidelink control message and a second reserved resource indicated by the second sidelink control message based on the first reserved resource overlapping in time and frequency with the second reserved resource, a signal strength of a signal received from the second UE, the third UE, or both, and at least one channel access parameter for communicating with the second UE, the third UE, or both, wherein the at least one channel access parameter includes a COT parameter. The operations of 1420 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1420 may be performed as described in reference to Fig.11 The described conflict indication is sent to the manager 1130 for execution.

[0253] Fig.15 A flow chart illustrating a method 1500 for supporting techniques for channel access awareness conflict determination for an unlicensed sidelink band according to one or more aspects of the present disclosure is shown. The operations of the method 1500 may be implemented by a UE or components thereof as described herein. For example, the operations of the method 1500 may be implemented by a UE or components thereof as described in reference to Figures 1 to 12 The described UE 115 may be performed. 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.

[0254] At 1505, the method may include receiving a first sidelink control message from a second UE indicating a first reserved resource to be used by the second UE for sidelink communication in a shared radio frequency spectrum band. The operations of 1505 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1505 may be performed as described in reference to Fig.11 The side link message receiving manager 1125 is executed.

[0255] At 1510, the method may include receiving a second sidelink control message from a third UE indicating second reserved resources to be used by the third UE for sidelink communications in the shared radio frequency spectrum band. The operations of 1510 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1510 may be performed as described in reference to Fig.11 The side link message receiving manager 1125 is executed.

[0256] At 1515, the method may include determining that a conflict exists based on that a first channel access type associated with the first reserved resource is the same channel access type as a second channel access type associated with the second reserved resource. The operations of 1515 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1515 may be performed as described in reference to Fig.11The described channel access type manager 1140 is performed.

[0257] At 1520, the method may include sending an indication of a conflict between a first reserved resource indicated by the first sidelink control message and a second reserved resource indicated by the second sidelink control message based on the first reserved resource overlapping in time and frequency with the second reserved resource, a signal strength of a signal received from the second UE, the third UE, or both, and at least one channel access parameter for communicating with the second UE, the third UE, or both, wherein the at least one channel access parameter includes a channel access type parameter. The operations of 1520 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1520 may be performed as described in reference to Fig.11 The described conflict indication is sent to the manager 1130 for execution.

[0258] Fig.16 A flow chart illustrating a method 1600 for supporting techniques for channel access awareness conflict determination for an unlicensed sidelink band according to one or more aspects of the present disclosure is shown. The operations of the method 1600 may be implemented by a UE or components thereof as described herein. For example, the operations of the method 1600 may be implemented by a UE or components thereof as described in reference to Figures 1 to 12 The described UE 115 may be performed. 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.

[0259] At 1605, the method may include receiving a first sidelink control message from a second UE indicating a first reserved resource to be used by the second UE for sidelink communication in a shared radio frequency spectrum band. The operations of 1605 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1605 may be performed as described in reference to Fig.11 The side link message receiving manager 1125 is executed.

[0260] At 1610, the method may include receiving a second sidelink control message from a third UE indicating second reserved resources to be used by the third UE for sidelink communications in the shared radio frequency spectrum band. The operations of 1610 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1610 may be performed as described in reference to Fig.11 The side link message receiving manager 1125 is executed.

[0261] At 1615, the method may include determining that a conflict exists based on the first CPE associated with the first reserved resource being the same CPE as the second CPE associated with the second reserved resource. The operations of 1615 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1615 may be performed as described in reference to Fig.11 The CPE manager 1145 is used to execute.

[0262] At 1620, the method may include sending an indication of a conflict between the first reserved resources indicated by the first sidelink control message and the second reserved resources indicated by the second sidelink control message based on the first reserved resources overlapping in time and frequency with the second reserved resources, the signal strength of the signal received from the second UE, the third UE, or both, and at least one channel access parameter for communicating with the second UE, the third UE, or both, wherein the at least one channel access parameter includes a CPE parameter. The operations of 1620 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1620 may be performed as described in reference to Fig.11 The described conflict indication is sent to the manager 1130 for execution.

[0263] The following provides an overview of various aspects of the disclosure:

[0264] Aspect 1: A method for wireless communication at a first UE, the method comprising: receiving a first side link control message from a second UE indicating first reserved resources to be used by the second UE for side link communication in a shared radio frequency spectrum band; receiving a second side link control message from a third UE indicating second reserved resources to be used by the third UE for side link communication in the shared radio frequency spectrum band; and sending an indication of a conflict between the first reserved resources indicated by the first side link control message and the second reserved resources indicated by the second side link control message based at least in part on the overlap of the first reserved resources with the second reserved resources in time and frequency, the signal strength of signals received from the second UE, the third UE, or both, and at least one channel access parameter for communicating with the second UE, the third UE, or both.

[0265] Aspect 2: According to the method described in Aspect 1, the method also includes: determining the existence of the conflict at least in part based on the first reserved resources being within a first COT associated with the second UE, shared with the second UE, or both, and at least in part based on the second reserved resources being within a second COT associated with the third UE, shared with the third UE, or both, wherein the at least one channel access parameter includes a COT parameter.

[0266] Aspect 3: According to the method described in any one of Aspects 1 to 2, the method further includes: determining the existence of the conflict at least in part based on the fact that a first channel access type associated with the first reserved resource is the same channel access type as a second channel access type associated with the second reserved resource, wherein the at least one channel access parameter includes a channel access type parameter.

[0267] Aspect 4: According to the method described in any one of Aspects 1 to 3, the method further includes: determining the existence of the conflict based at least in part on the fact that the first CPE associated with the first reserved resources is the same CPE as the second CPE associated with the second reserved resources, wherein the at least one channel access parameter includes a CPE parameter.

[0268] Aspect 5: According to the method described in any one of Aspects 1 to 4, the method further includes: determining the existence of the conflict based at least in part on that the first reserved resources are within a first COT associated with the second UE, shared with the second UE, or both, and at least in part on that the second reserved resources are within a second COT associated with the third UE, shared with the third UE, or both, and at least in part on that the first CPE associated with the first reserved resources is the same CPE as the second CPE associated with the second reserved resources, wherein the at least one channel access parameter includes a COT parameter and a CPE parameter.

[0269] Aspect 6: According to the method described in any one of Aspects 1 to 5, the method further includes: determining the existence of the conflict at least in part based on the fact that the first channel access type associated with the first reserved resource is the same channel access type as the second channel access type associated with the second reserved resource and at least in part based on the fact that the first CPE associated with the first reserved resource is the same CPE as the second CPE associated with the second reserved resource, wherein the at least one channel access parameter includes a channel access type parameter and a CPE parameter.

[0270] Aspect 7: According to the method described in any one of Aspects 1 to 6, the method further includes: determining the existence of the conflict at least in part based on the number of conflicting resources satisfying a quantity threshold, wherein the number of conflicting resources is identified at least in part based on whether the signal strength of a signal received on each corresponding resource of a plurality of resources coordinated by the first UE for a plurality of UEs satisfies a signal strength threshold.

[0271] Aspect 8: According to any one of Aspects 1 to 7, the method also includes: determining that the conflict between the first reserved resources and the second reserved resources exists based at least in part on a first signal strength associated with a first signal received from the second UE satisfying a signal strength threshold.

[0272] Aspect 9: According to the method of Aspect 8, the method also includes: determining the existence of the conflict between the first reserved resources and the second reserved resources at least in part based on the difference between the first signal strength associated with the first signal received from the second UE and the second signal strength associated with the second signal received from the third UE satisfying a signal strength difference threshold.

[0273] Aspect 10: According to the method described in any one of Aspects 1 to 9, the method also includes: sending the indication of the conflict to the second UE at least in part based on the fact that the first transmission indicated by the first side link control message of the second UE has a lower priority than the second transmission indicated by the second side link control message of the third UE.

[0274] Aspect 11: According to the method according to Aspect 10, the method also includes: receiving a third side link control message from the second UE in response to the indication of the conflict, identifying a third reserved resource different from the first reserved resource to be used by the second UE for side link communication.

[0275] Aspect 12: According to the method described in any one of Aspects 1 to 11, the method further includes: receiving capability signaling from the second UE via an SCI message indicating that the second UE is capable of receiving the indication of the conflict; and sending the indication of the conflict to the second UE via a physical side link feedback channel based at least in part on receiving the capability signaling.

[0276] Aspect 13: An apparatus for performing wireless communications at a first UE, the apparatus comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method according to any one of Aspects 1 to 12.

[0277] Aspect 14: 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 12.

[0278] Aspect 15: A non-transitory computer-readable medium storing a code for wireless communication at a first UE, the code comprising instructions executable by a processor to perform the method according to any one of aspects 1 to 12.

[0279] It should be noted that the methods described herein describe possible implementations, and that the operations and steps may be rearranged or otherwise modified and that other implementations are possible. Furthermore, aspects from two or more methods may be combined.

[0280] Although aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for example purposes, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used 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.

[0281] 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.

[0282] The various illustrative blocks and components described in conjunction with the disclosure herein may be implemented or performed using a general purpose processor, DSP, ASIC, CPU, FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in an alternative, the processor may be any processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors combined with a DSP core, or any other such configuration).

[0283] The functions described herein may be implemented using hardware, software executed by a processor, firmware, or any combination thereof. If implemented using software executed by a processor, the functions may be stored as one or more instructions or codes of a computer-readable medium, or sent using the one or more instructions or codes. 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 any combination 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.

[0284] Computer-readable medium includes both non-transient computer storage medium and communication medium, including any medium that facilitates computer program to be transmitted from one position to another position.Non-transient storage medium can be any available medium that can be accessed by general or special-purpose computer.By way of example and not limitation, non-transient computer-readable medium can include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, compact disc (CD) ROM or other optical disc storage, disk storage or other magnetic storage device, or can be used for carrying or storing desired program code parts and can be accessed by general or special-purpose computer or general or special-purpose processor in the form of instruction or data structure Any other non-transient medium.Moreover, any connection is appropriately referred to as computer-readable medium.For example, if software is sent from website, server or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) or wireless technology such as infrared, radio and microwave, then coaxial cable, fiber optic cable, twisted pair, DSL or wireless technology such as infrared, radio and microwave are included in the definition of computer-readable medium. Disks and optical disks as used herein include CDs, laser optical disks, optical optical disks, digital versatile disks (DVDs), floppy disks, and Blu-ray disks. 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.

[0285] As used herein (including in the claims), "or" used in a list of items (e.g., a list of items with a phrase such as "at least one of" or "one or more of") indicates an inclusive list, so that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). In addition, as used herein, the phrase "based on" should not be interpreted as a reference to a closed set of conditions. For example, an example step described as "based on condition A" can be based on 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."

[0286] 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, etc. Additionally, "determining" may include receiving (e.g., receiving information), accessing (e.g., accessing data stored in a memory), etc. Additionally, "determining" may include parsing, retrieving, selecting, choosing, establishing, and other such similar actions.

[0287] 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 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.

[0288] 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 "having advantages over other examples." The specific embodiments include specific details to provide an understanding of the described technology. However, these technologies may be practiced without these specific details. In some instances, known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described examples.

[0289] 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. An apparatus for wireless communication at a first user equipment (UE), the apparatus comprising: processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to: receiving, from a second UE, a first sidelink control message indicating first reserved resources to be used by the second UE for sidelink communications in a shared radio frequency spectrum band; receiving, from a third UE, a second sidelink control message indicating second reserved resources to be used by the third UE for sidelink communications in the shared radio frequency spectrum band; as well as sending an indication of a conflict between the first reserved resources indicated by the first side link control message and the second reserved resources indicated by the second side link control message based at least in part on overlap of the first reserved resources in time and frequency with the second reserved resources, signal strength of signals received from the second UE, the third UE, or both, and at least one channel access parameter for communicating with the second UE, the third UE, or both.

2. The apparatus of claim 1 , wherein the instructions are further executable by the processor to cause the apparatus to: The existence of the conflict is determined at least in part based on the first reserved resources being within a first channel occupancy time associated with, shared with, or both the second UE and at least in part based on the second reserved resources being within a second channel occupancy time associated with, shared with, or both the third UE, wherein the at least one channel access parameter includes a channel occupancy time parameter.

3. The apparatus of claim 1 , wherein the instructions are further executable by the processor to cause the apparatus to: The presence of the conflict is determined based at least in part on a first channel access type associated with the first reserved resources being the same channel access type as a second channel access type associated with the second reserved resources, wherein the at least one channel access parameter includes a channel access type parameter.

4. The apparatus of claim 1, wherein the instructions are further executable by the processor to cause the apparatus to: The conflict is determined to exist based at least in part on a first cyclic prefix extension associated with the first reserved resources being the same cyclic prefix extension as a second cyclic prefix extension associated with the second reserved resources, wherein the at least one channel access parameter includes a cyclic prefix extension parameter.

5. The apparatus of claim 1, wherein the instructions are further executable by the processor to cause the apparatus to: The conflict is determined to exist based at least in part on the first reserved resource being within a first channel occupancy time associated with, shared with, or both the second UE and at least in part on the second reserved resource being within a second channel occupancy time associated with, shared with, or both the third UE and at least in part on the first cyclic prefix extension associated with the first reserved resource being the same cyclic prefix extension as the second cyclic prefix extension associated with the second reserved resource, wherein the at least one channel access parameter includes a channel occupancy time parameter and a cyclic prefix extension parameter.

6. The apparatus of claim 1, wherein the instructions are further executable by the processor to cause the apparatus to: The presence of the conflict is determined at least in part based on a first channel access type associated with the first reserved resources being the same channel access type as a second channel access type associated with the second reserved resources and at least in part based on a first cyclic prefix extension associated with the first reserved resources being the same cyclic prefix extension as a second cyclic prefix extension associated with the second reserved resources, wherein the at least one channel access parameter includes a channel access type parameter and a cyclic prefix extension parameter.

7. The apparatus of claim 1, wherein the instructions are further executable by the processor to cause the apparatus to: The presence of the conflict is determined based at least in part on a number of conflicting resources satisfying a number threshold, wherein the number of conflicting resources is identified based at least in part on whether a signal strength of a signal received on each corresponding resource of a plurality of resources coordinated by the first UE for a plurality of UEs satisfies a signal strength threshold.

8. The apparatus of claim 1, wherein the instructions are further executable by the processor to cause the apparatus to: The conflict between the first reserved resources and the second reserved resources is determined to exist based at least in part on a first signal strength associated with a first signal received from the second UE satisfying a signal strength threshold.

9. The apparatus of claim 8, wherein the instructions are further executable by the processor to cause the apparatus to: Determining that the conflict between the first reserved resources and the second reserved resources exists based at least in part on a difference between the first signal strength associated with the first signal received from the second UE and a second signal strength associated with a second signal received from the third UE satisfying a signal strength difference threshold.

10. The apparatus of claim 1, wherein the instructions are further executable by the processor to cause the apparatus to: The indication of the conflict is sent to the second UE based at least in part on a first transmission by the second UE indicated by the first sidelink control message having a lower priority than a second transmission by the third UE indicated by the second sidelink control message.

11. The apparatus of claim 10, wherein the instructions are further executable by the processor to cause the apparatus to: Responsive to the indication of the conflict, a third sidelink control message is received from the second UE identifying third reserved resources different from the first reserved resources to be used by the second UE for sidelink communications.

12. The apparatus of claim 1, wherein the instructions are further executable by the processor to cause the apparatus to: receiving capability signaling from the second UE via a sidelink control information message indicating that the second UE is capable of receiving the indication of the conflict; and The indication of the conflict is sent to the second UE via a physical sidelink feedback channel based at least in part on receiving the capability signaling.

13. A method for wireless communication at a first user equipment (UE), the method comprising: receiving, from a second UE, a first sidelink control message indicating first reserved resources to be used by the second UE for sidelink communications in a shared radio frequency spectrum band; receiving, from a third UE, a second sidelink control message indicating second reserved resources to be used by the third UE for sidelink communications in the shared radio frequency spectrum band; as well as sending an indication of a conflict between the first reserved resources indicated by the first side link control message and the second reserved resources indicated by the second side link control message based at least in part on overlap of the first reserved resources in time and frequency with the second reserved resources, signal strength of signals received from the second UE, the third UE, or both, and at least one channel access parameter for communicating with the second UE, the third UE, or both.

14. The method according to claim 13, further comprising: The existence of the conflict is determined at least in part based on the first reserved resources being within a first channel occupancy time associated with, shared with, or both the second UE and at least in part based on the second reserved resources being within a second channel occupancy time associated with, shared with, or both the third UE, wherein the at least one channel access parameter includes a channel occupancy time parameter.

15. The method according to claim 13, further comprising: The presence of the conflict is determined based at least in part on a first channel access type associated with the first reserved resources being the same channel access type as a second channel access type associated with the second reserved resources, wherein the at least one channel access parameter includes a channel access type parameter.

16. The method according to claim 13, further comprising: The conflict is determined to exist based at least in part on a first cyclic prefix extension associated with the first reserved resources being the same cyclic prefix extension as a second cyclic prefix extension associated with the second reserved resources, wherein the at least one channel access parameter includes a cyclic prefix extension parameter.

17. The method according to claim 13, further comprising: The conflict is determined to exist based at least in part on the first reserved resource being within a first channel occupancy time associated with, shared with, or both the second UE and at least in part on the second reserved resource being within a second channel occupancy time associated with, shared with, or both the third UE and at least in part on the first cyclic prefix extension associated with the first reserved resource being the same cyclic prefix extension as the second cyclic prefix extension associated with the second reserved resource, wherein the at least one channel access parameter includes a channel occupancy time parameter and a cyclic prefix extension parameter.

18. The method according to claim 13, further comprising: The presence of the conflict is determined at least in part based on a first channel access type associated with the first reserved resources being the same channel access type as a second channel access type associated with the second reserved resources and at least in part based on a first cyclic prefix extension associated with the first reserved resources being the same cyclic prefix extension as a second cyclic prefix extension associated with the second reserved resources, wherein the at least one channel access parameter includes a channel access type parameter and a cyclic prefix extension parameter.

19. The method according to claim 13, further comprising: The presence of the conflict is determined based at least in part on a number of conflicting resources satisfying a number threshold, wherein the number of conflicting resources is identified based at least in part on whether a signal strength of a signal received on each corresponding resource of a plurality of resources coordinated by the first UE for a plurality of UEs satisfies a signal strength threshold.

20. The method according to claim 13, further comprising: The conflict between the first reserved resources and the second reserved resources is determined to exist based at least in part on a first signal strength associated with a first signal received from the second UE satisfying a signal strength threshold.

21. The method according to claim 20, further comprising: Determining that the conflict between the first reserved resources and the second reserved resources exists based at least in part on a difference between the first signal strength associated with the first signal received from the second UE and a second signal strength associated with a second signal received from the third UE satisfying a signal strength difference threshold.

22. The method according to claim 13, further comprising: The indication of the conflict is sent to the second UE based at least in part on a first transmission by the second UE indicated by the first sidelink control message having a lower priority than a second transmission by the third UE indicated by the second sidelink control message.

23. The method according to claim 22, further comprising: Responsive to the indication of the conflict, a third sidelink control message is received from the second UE identifying third reserved resources different from the first reserved resources to be used by the second UE for sidelink communications.

24. The method according to claim 13, further comprising: receiving capability signaling from the second UE via a sidelink control information message indicating that the second UE is capable of receiving the indication of the conflict; as well as The indication of the conflict is sent to the second UE via a physical sidelink feedback channel based at least in part on receiving the capability signaling.

25. A non-transitory computer-readable medium storing code for wireless communication at a first user equipment (UE), the code comprising instructions executable by a processor to: receiving, from a second UE, a first sidelink control message indicating first reserved resources to be used by the second UE for sidelink communications in a shared radio frequency spectrum band; receiving, from a third UE, a second sidelink control message indicating second reserved resources to be used by the third UE for sidelink communications in the shared radio frequency spectrum band; as well as sending an indication of a conflict between the first reserved resources indicated by the first side link control message and the second reserved resources indicated by the second side link control message based at least in part on overlap of the first reserved resources in time and frequency with the second reserved resources, signal strength of signals received from the second UE, the third UE, or both, and at least one channel access parameter for communicating with the second UE, the third UE, or both.

26. The non-transitory computer readable medium of claim 25, wherein the instructions are further executable by the processor to: The existence of the conflict is determined at least in part based on the first reserved resources being within a first channel occupancy time associated with, shared with, or both the second UE and at least in part based on the second reserved resources being within a second channel occupancy time associated with, shared with, or both the third UE, wherein the at least one channel access parameter includes a channel occupancy time parameter.

27. The non-transitory computer readable medium of claim 25, wherein the instructions are further executable by the processor to: The presence of the conflict is determined based at least in part on a first channel access type associated with the first reserved resources being the same channel access type as a second channel access type associated with the second reserved resources, wherein the at least one channel access parameter includes a channel access type parameter.

28. The non-transitory computer readable medium of claim 25, wherein the instructions are further executable by the processor to: The conflict is determined to exist based at least in part on a first cyclic prefix extension associated with the first reserved resources being the same cyclic prefix extension as a second cyclic prefix extension associated with the second reserved resources, wherein the at least one channel access parameter includes a cyclic prefix extension parameter.

29. An apparatus for wireless communication at a first user equipment (UE), the apparatus comprising: means for receiving, from a second UE, a first sidelink control message indicating first reserved resources to be used by the second UE for sidelink communications in a shared radio frequency spectrum band; means for receiving, from a third UE, a second sidelink control message indicating second reserved resources to be used by the third UE for sidelink communications in the shared radio frequency spectrum band; and A component for sending an indication of a conflict between the first reserved resources indicated by the first sidelink control message and the second reserved resources indicated by the second sidelink control message based at least in part on overlap of the first reserved resources in time and frequency with the second reserved resources, signal strength of signals received from the second UE, the third UE, or both, and at least one channel access parameter for communicating with the second UE, the third UE, or both.

30. The apparatus according to claim 29, further comprising: A means for determining that the conflict exists based at least in part on the first reserved resources being within a first channel occupancy time associated with, shared with, or both the second UE and at least in part on the second reserved resources being within a second channel occupancy time associated with, shared with, or both the third UE, wherein the at least one channel access parameter comprises a channel occupancy time parameter.

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