Spatial reuse for sidelink communications

Abstract

The described technology relates to improved methods, systems, devices, and apparatuses supporting spatial reuse for sidelink communications. In summary, the described technology provides a user equipment (UE) with the ability to reuse resources to receive sidelink transmissions. The UE may receive a first sidelink control channel that indicates a set of reserved resources for sidelink communications associated with a second UE. A first UE may decode a second sidelink control channel from the second UE based on the first sidelink control channel. The first UE may determine the available resource set based on the result of decoding the second sidelink control channel, the radius of the second sidelink control channel, and the distance between the first UE and the second UE.

Description

[0001] Cross-references

[0002] This patent application claims the benefits of the following applications: U.S. Provisional Patent Application No. 63 / 066,073, entitled “Spatial Reuse for Sidelink Communications,” filed August 14, 2020, by Wang et al.; and U.S. Patent Application No. 17 / 399,749, entitled “Spatial Reuse for Sidelink Communications,” filed August 11, 2021, by Wang et al.; each of the above applications is assigned to the assignee of this application. Technical Field

[0003] The following discussion relates to wireless communication, including spatial reuse for side link communication. Background Technology

[0004] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, and broadcasting. These systems can 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 (e.g., Long Term Evolution (LTE) systems, improved LTE (LTE-A) systems, or LTE-A Pro systems) and fifth-generation (5G) systems (which may be referred to as New Radio (NR) systems). These systems can employ technologies such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal FDMA (OFDMA), or Discrete Fourier Transform Extended Orthogonal Frequency Division Multiplexing (DFT-S-OFDM). A wireless multiple access communication system may include one or more base stations or one or more network access nodes, each base station or network access node simultaneously supporting communication with multiple communication devices (which may also be referred to as User Equipment (UE)).

[0005] In some wireless communication systems, a transmitting UE can send sidelink control information (SCI) to one or more neighboring UEs. The SCI may indicate resources reserved for retransmissions performed by the transmitting UE. In some wireless communication systems, the coverage area of ​​the SCI can be increased so that it can be decoded by multiple UEs in the network. In some cases, the reserved resources indicated by the SCI may not be used for retransmissions performed by the transmitting UE. Therefore, the reserved resources may not be used by every UE receiving the SCI, potentially leading to inefficient use of resources within the wireless communication system. Summary of the Invention

[0006] The described technology relates to improved methods, systems, devices, and apparatuses supporting spatial reuse for sidelink communications. In summary, the described technology provides a way for a user equipment (UE) to reuse resources to receive sidelink transmissions. For example, a first UE may receive a first sidelink control channel including first-level sidelink control information (SCI) from a transmitting UE. The first-level SCI may be sent to the first UE and one or more other sidelink UEs to indicate resources reserved for sidelink communications (such as retransmissions) associated with the transmitting UE. By broadcasting the indication of reserved resources to one or more UEs via the first-level SCI, the transmitting UE can reduce the probability of resource conflicts within the network and improve the reliability associated with sidelink communications. The first UE can then monitor and decode a second sidelink control channel from the transmitting UE. In some examples, the second sidelink control channel may include a second-level SCI. The second-level SCI may indicate which reserved resources the transmitting UE can use for sidelink transmissions. The first UE may determine the use of the reserved resources indicated by the first-level SCI based on decoding the second sidelink control channel or based on the radius of the second sidelink control channel and the distance between the first UE and the second UE. For example, the first UE can determine the difference between the distance between the first UE and the second UE and the radius associated with the second side crosslink control channel. This difference can be referred to as the interference-free distance, the reduced interference distance, etc., and can be used by the first UE to determine whether to reuse one or more reserved resources, such as reserved resources that the first UE can use in the case of reduced interference (e.g., interference below a threshold).

[0007] A method for wireless communication at a first UE is described. The method may include: receiving from a second UE a first sidelink control channel indicating a set of reserved resources for sidelink communication associated with the second UE; decoding a second sidelink control channel from the second UE based on the first sidelink control channel; and determining, based on the decoding of the second sidelink control channel, the radius of the second sidelink control channel, and the distance between the first UE and the second UE, that the set of reserved resources is available for use by the first UE.

[0008] 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 from a second UE a first sidelink control channel indicating a set of reserved resources for sidelink communication associated with the second UE; decode a second sidelink control channel from the second UE based on the first sidelink control channel; and determine, based on the decoding of the second sidelink control channel, the radius of the second sidelink control channel, and the distance between the first UE and the second UE, that the set of reserved resources is available for use by the first UE.

[0009] Another apparatus for wireless communication at a first UE is described. The apparatus may include units for performing the following operations: receiving from a second UE a first sidelink control channel indicating a set of reserved resources for sidelink communication associated with the second UE; decoding a second sidelink control channel from the second UE based on the first sidelink control channel; and determining, based on the decoding of the second sidelink control channel, the radius of the second sidelink control channel, and the distance between the first UE and the second UE, that the set of reserved resources is available for use by the first UE.

[0010] A non-transitory computer-readable medium is described, storing code for wireless communication at a first UE. The code may include instructions executable by a processor to: receive from a second UE a first sidelink control channel indicating a set of reserved resources for sidelink communication associated with the second UE; decode a second sidelink control channel from the second UE based on the first sidelink control channel; and determine, based on the decoding of the second sidelink control channel, the radius of the second sidelink control channel, and the distance between the first UE and the second UE, that the set of reserved resources is available for use by the first UE.

[0011] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing: determining that the decoding of the second-side crosslink control channel may be successful; and determining the radius of the second-side crosslink control channel based on the determination that the decoding of the second-side crosslink control channel may be successful, wherein the reserved resource set may be determined to be available based on a first distance corresponding to the difference between the distance between the first UE and the second UE and the radius of the second-side crosslink control channel exceeding a threshold distance.

[0012] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for determining the threshold distance based on a second distance between the second UE and a target UE associated with the first side link control channel and the path loss between the first UE and the second UE.

[0013] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing: identifying a modulation and coding scheme (MCS), beta offset, control format, or any combination thereof associated with the second side crosslink control channel based on the decoding of the first side crosslink control channel; and determining the second distance between the second UE and the target UE based on the MCS, the beta offset, the control format, or any combination thereof associated with the second side crosslink control channel.

[0014] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for receiving a reference signal using a first sidelink control channel, a second sidelink control channel, or a sidelink data channel, or any combination thereof, wherein the path loss between the first UE and the second UE may be determined based on power measurements associated with the reference signal.

[0015] In some examples of the methods, apparatuses and non-transitory computer-readable media described herein, the power measurement may be a reference signal received power (RSRP), a reference signal strength indicator (RSSI), or a combination thereof.

[0016] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for determining the threshold distance based on an alpha factor corresponding to a path loss exponent, a signal-to-interference-plus-noise ratio (SINR) target, a spatial transmission type, or any combination thereof.

[0017] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for determining a transmit power for communicating with a target UE using the reserved resource set, based on the radius of the second-side crosslink control channel and the distance between the first UE and the second UE.

[0018] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following: receiving one or more additional sidelink control channels, each additional sidelink control channel indicating a corresponding set of reserved resources for sidelink communication; determining a subset of reserved resources that can be used for the first UE, the subset of reserved resources being derived from the corresponding set of reserved resources and the set of reserved resources; and using the subset of reserved resources to communicate with the target UE.

[0019] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for determining the subset of reserved resources based on the corresponding transmit power for the one or more additional side link control channels.

[0020] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing: determining a corresponding distance for the one or more additional side link control channels based on a corresponding successful decoding process for the one or more additional side link control channels; and determining the reserved resource subset based on the corresponding distance associated with the one or more additional side link control channels.

[0021] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following: selecting from a set of subchannels a subchannel for sidelink communication with a target UE via the set of reserved resources, wherein the subchannel may be different from the subchannel used for the first sidelink control channel.

[0022] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing: receiving an indication of a sub-channel index for the first sidelink control channel within a field of the first sidelink control channel; and selecting from a set of sub-channels a sub-channel for sidelink communication with a target UE via the set of reserved resources, wherein the sub-channel may be associated with an index different from the sub-channel index.

[0023] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing: determining a subchannel associated with the first-side walkway control channel; and transmitting the third-side walkway control channel using the subchannel based on priority, demodulation reference signal (DMRS) mode, and subsequent control channel format being identical for the third-side walkway control channel and the subsequent control channel, the third-side walkway control channel indicating the set of reserved resources available for use by the first UE.

[0024] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following: based on determining that the reserved resource set is available for use by the first UE to communicate with the target UE via the reserved resource set.

[0025] A method for wireless communication at a first UE is described. The method may include: receiving from a second UE a first sidelink control channel indicating a set of reserved resources for sidelink communication associated with the second UE; monitoring a second sidelink control channel from the second UE based on the first sidelink control channel; and determining, based on the monitoring of the second sidelink control channel, that the set of reserved resources is available for use by the first UE, wherein the set of reserved resources is determined to be available based on unsuccessful decoding of the second sidelink control channel.

[0026] 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 from a second UE a first sidelink control channel indicating a set of reserved resources for sidelink communication associated with the second UE; monitor a second sidelink control channel from the second UE based on the first sidelink control channel; and determine, based on the monitoring of the second sidelink control channel, that the set of reserved resources is available for use by the first UE, wherein the set of reserved resources is determined to be available based on unsuccessful decoding of the second sidelink control channel.

[0027] Another apparatus for wireless communication at a first UE is described. The apparatus may include units for performing the following operations: receiving from a second UE a first sidelink control channel indicating a set of reserved resources for sidelink communication associated with the second UE; monitoring a second sidelink control channel from the second UE based on the first sidelink control channel; and determining, based on the monitoring of the second sidelink control channel, that the set of reserved resources is available for use by the first UE, wherein the set of reserved resources is determined to be available based on unsuccessful decoding of the second sidelink control channel.

[0028] A non-transitory computer-readable medium is described, storing code for wireless communication at a first UE. The code may include instructions executable by a processor to: receive from a second UE a first sidelink control channel indicating a set of reserved resources for sidelink communication associated with the second UE; monitor a second sidelink control channel from the second UE based on the first sidelink control channel; and determine, based on the monitoring of the second sidelink control channel, that the set of reserved resources is available for use by the first UE, wherein the set of reserved resources is determined to be available based on unsuccessful decoding of the second sidelink control channel.

[0029] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following: receiving one or more additional sidelink control channels, each additional sidelink control channel indicating a corresponding set of reserved resources for sidelink communication; determining a subset of reserved resources that can be used for the first UE, the subset of reserved resources being derived from the corresponding set of reserved resources and the set of reserved resources; and using the subset of reserved resources to communicate with the target UE.

[0030] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for determining the subset of reserved resources based on the corresponding transmit power for the one or more additional side link control channels.

[0031] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following: selecting from a set of subchannels a subchannel for sidelink communication with a target UE via the set of reserved resources, wherein the subchannel may be different from the subchannel used for the first sidelink control channel.

[0032] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing: receiving an indication of a sub-channel index for the first sidelink control channel within a field of the first sidelink control channel; and selecting from a set of sub-channels a sub-channel for sidelink communication with a target UE via the set of reserved resources, wherein the sub-channel may be associated with an index different from the sub-channel index.

[0033] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing: determining a subchannel associated with the first-side traversal control channel; and transmitting the third-side traversal control channel using the subchannel based on the fact that priority, DMRS mode, and subsequent control channel format are the same for the third-side traversal control channel and the subsequent control channel, the third-side traversal control channel indicating the set of reserved resources available for use by the first UE.

[0034] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following: based on determining that the reserved resource set is available for use by the first UE to communicate with the target UE via the reserved resource set.

[0035] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for determining the transmit power for communicating with the target UE via the reserved resource set based on the unsuccessful decoding of the second-side link control channel. Attached Figure Description

[0036] Figure 1 An example of a system for wireless communication that supports space reuse for side link communication is shown, according to various aspects of this disclosure.

[0037] Figure 2 An example of a system for wireless communication that supports spatial reuse for side link communication is shown, according to various aspects of this disclosure.

[0038] Figure 3 An example of a coverage area map supporting spatial reuse for side link communication is shown, according to various aspects of this disclosure.

[0039] Figure 4 An example of a coverage area map supporting spatial reuse for side link communication is shown, according to various aspects of this disclosure.

[0040] Figure 5 An example of a process flow supporting spatial reuse for sidelink communication is shown, based on various aspects of this disclosure.

[0041] Figure 6 and Figure 7 A block diagram of a device supporting spatial reuse for sidelink communication is shown, according to various aspects of this disclosure.

[0042] Figure 8 A block diagram of a communication manager supporting spatial reuse for side link communication is shown, according to various aspects of this disclosure.

[0043] Figure 9 A diagram of a system including a device supporting space reuse for side link communication is shown, according to various aspects of this disclosure.

[0044] Figures 10 to 16 A flowchart illustrating a method for space reuse in sidelink communication that supports various aspects of this disclosure is shown. Detailed Implementation

[0045] In some wireless communication systems, devices in the network (e.g., user equipment (UE), base station, or other node) can transmit sidelink channel information (SCI) to another device (e.g., another sidelink device). SCIs can be transmitted in one or more levels. For example, a first UE can send a first-level SCI (e.g., SCI1) to each adjacent sidelink UE in the network. The first-level SCI may indicate resources reserved for retransmission (e.g., physical sidelink shared channel (PSSCH) resources). To improve reliability, the coverage area of ​​the first-level SCI can be increased (e.g., the transmit power for SCI1 transmission can be increased), allowing adjacent UEs to decode the first-level SCI and identify the reserved resources with a higher probability to reduce interference (e.g., adjacent UEs can receive SCI1 and avoid using the reserved resources indicated by SCI1 when performing sidelink communication with other UEs). The first device can then transmit a second-level SCI (e.g., SCI2) via a second sidelink control channel. In some cases, a second sidelink control channel including a second-level SCI can be transmitted via PSSCH resources indicated by the first-level SCI (e.g., SCI2 can be transmitted in one or more time slots of a reserved PSSCH) to indicate which of the reserved resources the first device can use. To reduce interference during the transmission of the second-level SCI, the transmitting UE can transmit the second-level SCI via a smaller coverage area compared to the first-level SCI. Therefore, the area used for the throughput of sidelink transmissions may be limited by the radius of the first-level SCI coverage. In some cases, reserved resources may not be used for retransmissions by the first UE or other UEs (e.g., not reused by the first UE or other UEs).

[0046] As described herein, a sidelink UE receiving a Level 1 SCI can reuse reserved resources indicated by the Level 1 SCI to improve sidelink transmission throughput and reduce the amount of unused resources. For example, a transmitting UE can send (e.g., broadcast) a Level 1 SCI for sidelink communication to a first sidelink UE and one or more other sidelink UEs in the network via the Physical Sidelink Control Channel (PSCCH). The Level 1 SCI can indicate reserved resources, where one or more UEs intending to receive the corresponding sidelink transmission can decode a Level 2 SCI. However, in some cases, a UE may avoid decoding the Level 2 SCI (e.g., the UE may be outside the coverage area of ​​the Level 2 SCI, the UE may not be able to decode the resources indicated by the Level 1 SCI, the UE may not intend to receive the corresponding sidelink transmission, or a combination thereof), and the UE can alternatively determine to reuse the resources indicated as reserved by the Level 1 SCI. Additionally or alternatively, if the UE determines a safe distance (e.g., interference-free distance) from the transmitting UE, the UE can determine to use the reserved resources. The UE can determine the transmit power and transmit resources for reusing the indicated resources without interfering with the original SCI transmission by performing one or more distance measurements and one or more power measurements, thereby reusing resources with reduced interference.

[0047] In some examples, to determine an interference-free area for reusing indicated PSSCH resources, a sidelink UE can measure the radio frequency (RF) distance to the boundary of the PSSCH coverage area. For example, to obtain the RF distance, the UE can perform a power measurement to estimate the distance to the transmitting UE. In one example, the UE can use the demodulation reference signal (DMRS) in both the first and second level SCIs to perform the power measurement to estimate the path loss to the transmitter (e.g., the loss of reference signal received power (RSRP), such as PL). RSRP The UE can determine the distance to the transmitter, D, based on path loss estimation. The UE can determine the radius, R2, of the PSSCH coverage area based on information decoded in the first-level SCI (e.g., the UE can decode SCI1 and identify one or more of the modulation and coding scheme (MCS), beta offset, and PSSCH resource formats). Therefore, the UE can determine the interference-free RF distance by subtracting the radius of the PSSCH coverage area from the distance between the UE and the transmitting UE (e.g., the RF distance d2 can be determined by d2 = D - R2). Thus, the UE can reuse the resources indicated by the first-level SCI within the coverage area of ​​radius d2.

[0048] If a sidelink UE determines to reuse resources, it can broadcast a new Level 1 SCI transmission to other receiving sidelink UEs to indicate to each UE that the resource is occupied and where the receiving UEs can decode the sidelink transmission. The UE can use one or more methods to reduce interference with existing Level 1 SCI transmissions (e.g., ensuring that the coverage area of ​​the new Level 1 SCI transmission does not overlap with the coverage area of ​​existing Level 1 SCI transmissions). In one example, the UE can avoid transmitting the Level 1 SCI via a subchannel that contains the existing Level 1 SCI (e.g., it can avoid reusing the existing subchannel). In another example, the location of the Level 1 SCI can be relaxed so that the UE can transmit the new Level 1 SCI transmission in a separate subchannel (e.g., the UE can indicate the new subchannel to the receiving UE via a field in the SCI). In yet another example, the UE can determine the transmit power for transmitting the new Level 1 SCI based on the interference-free distance, the result of the decoding process for the existing SCI, or both. Alternatively or concurrently, the new Level 1 SCI can include the same information as the existing Level 1 SCI, and the UE can transmit the new Level 1 SCI via the same subchannel as the existing Level 1 SCI.

[0049] By recognizing and reusing reserved resources indicated by the Level 1 SCI, the receiving UE can increase the throughput available for sidelink transmissions and reduce the latency associated with sidelink communication.

[0050] The various aspects of this disclosure are first described in the context of a wireless communication system. Additional aspects are described with reference to coverage area diagrams and process flows. The various aspects of this disclosure are further illustrated by apparatus diagrams, system diagrams, and flowcharts relating to spatial reuse for side link communication, and are described with reference to these diagrams.

[0051] Figure 1 Examples of a wireless communication system 100 according to various aspects of this disclosure are shown. The wireless communication system 100 may include one or more base stations 105, one or more UEs 115, and a core network 130. In some examples, the wireless communication system 100 may be a Long Term Evolution (LTE) network, an improved LTE (LTE-A) network, an LTE-APro network, or a New Radio (NR) network. In some examples, the wireless communication system 100 may support enhanced broadband communication, ultra-reliable (e.g., mission-critical) communication, low-latency communication, or communication with low-cost and low-complexity devices, or any combination thereof.

[0052] Base stations 105 can be distributed throughout a geographical area to form a wireless communication system 100, and can be devices of different forms or with different capabilities. Base stations 105 and UE 115 can communicate wirelessly via one or more communication links 125. Each base station 105 can provide a coverage area 110, and UE 115 and base station 105 can establish one or more communication links 125 on the coverage area 110. Coverage area 110 can be an example of a geographical area where base station 105 and UE 115 can support signal transmission according to one or more radio access technologies.

[0053] UE 115 can be distributed throughout the entire coverage area 110 of the wireless communication system 100, and each UE 115 can be stationary, mobile, or both at different times. UE 115 can be devices of different forms or with different capabilities. Figure 1 Some example UE 115s are shown in the document. The UE 115 described herein is capable of communicating with various types of devices, such as other UE 115s, base station 105, or network devices (e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network devices), such as... Figure 1 As shown.

[0054] Base station 105 can communicate with core network 130, communicate with each other, or perform both of these operations. For example, base station 105 can interface with core network 130 via one or more backhaul links 120 (e.g., via S1, N2, N3, or other interfaces). Base station 105 can communicate with each other directly (e.g., directly between base stations 105) on backhaul links 120 (e.g., via X2, Xn, or other interfaces), or indirectly (e.g., via core network 130), or perform both of these operations. In some examples, backhaul link 120 can be or includes one or more radio links.

[0055] One or more of the base stations 105 described herein may include, or may be referred to by those skilled in the art as, base station transceiver, radio base station, access point, radio transceiver, node B, evolved node B (eNB), next-generation node B or gigabit node B (any of which may be referred to as gNB), home node B, home evolved node B, or some other suitable term.

[0056] UE 115 may include or be referred to as a mobile device, wireless device, remote device, handheld device, or subscriber device, or some other suitable term, wherein "device" may also be referred to as a unit, station, terminal, or client, and other examples. UE 115 may also include or be referred to as a personal electronic device, such as a cellular phone, personal digital assistant (PDA), tablet computer, laptop computer, or personal computer. In some examples, UE 115 may include or be referred to as a wireless local loop (WLL) station, Internet of Things (IoT) device, Internet of Everything (IoE) device, or machine-type communication (MTC) device, and other examples, which may be implemented in various articles such as electrical appliances, vehicles, meters, and other examples.

[0057] The UE 115 described in this document can communicate with various types of devices, such as other UE 115s that can sometimes act as repeaters, as well as base station 105 and network devices, including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, and other examples, such as... Figure 1 As shown.

[0058] UE 115 and base station 105 can wirelessly communicate with each other via one or more communication links 125 on one or more carriers. The term "carrier" can refer to a set of radio frequency spectrum resources having a defined physical layer structure for supporting communication link 125. For example, a carrier for communication link 125 may include a portion of a radio frequency spectrum band (e.g., a bandwidth portion (BWP)) that operates according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR). Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information), control signaling coordinating operation for the carrier, user data, or other signaling. Wireless communication system 100 can support communication with UE 115 using carrier aggregation or multi-carrier operation. Depending on the carrier aggregation configuration, UE 115 can be configured with multiple downlink component carriers and one or more uplink component carriers. Carrier aggregation can be used in conjunction with both frequency division duplex (FDD) component carriers and time division duplex (TDD) component carriers.

[0059] In some examples (e.g., in a carrier aggregation configuration), carriers may also have acquisition or control signaling that coordinates operation against other carriers. Carriers may be associated with frequency channels (e.g., Evolved Universal Mobile Telecommunications System Terrestrial Radio Access (E-UTRA) Absolute Radio Frequency Channel Number (EARFCN)) and may be positioned according to a channel grid for discovery by UE 115. Carriers may operate in standalone mode, where UE 115 performs initial acquisition and connection via a carrier, or in non-standalone mode, where different carriers (e.g., the same or different radio access technologies) are used to anchor the connection.

[0060] The communication link 125 shown in the wireless communication system 100 may include uplink transmission from UE 115 to base station 105, or downlink transmission from base station 105 to UE 115. The carrier may carry downlink or uplink communication (e.g., in FDD mode) or may be configured to carry both downlink and uplink communication (e.g., in TDD mode).

[0061] A carrier can be associated with a specific bandwidth of the radio frequency spectrum, and in some examples, the carrier bandwidth can be referred to as the carrier or the “system bandwidth” of the wireless communication system 100. For example, the carrier bandwidth can be one of a number of defined bandwidths for a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 MHz). Devices of the wireless communication system 100 (e.g., base station 105, UE 115, or both) can have a hardware configuration that supports communication on a specific carrier bandwidth, or can be configured to support communication on one carrier bandwidth in a set of carrier bandwidths. In some examples, the wireless communication system 100 may include a base station 105 or UE 115 that supports simultaneous communication via carriers associated with multiple carrier bandwidths. In some examples, each served UE 115 can be configured to operate on a portion (e.g., a subband, BWP) or all of the carrier bandwidth.

[0062] The signal waveform transmitted on a carrier can consist of multiple subcarriers (e.g., using multicarrier modulation (MCM) techniques such as Orthogonal Frequency Division Multiplexing (OFDM) or Discrete Fourier Transform Spread Spectrum OFDM (DFT-S-OFDM)). In a system employing MCM, a resource element can include a symbol period (e.g., the duration of a modulation symbol) and a subcarrier, where the symbol period and subcarrier spacing are inversely related. The number of bits carried by each resource element can depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both). Therefore, the more resource elements UE 115 receives and the higher the order of the modulation scheme, the higher the data rate can be for UE 115. Wireless communication resources can refer to a combination of radio frequency spectrum resources, temporal resources, and spatial resources (e.g., spatial layers or beams), and the use of multiple spatial layers can further increase the data rate or data integrity used for communication with UE 115.

[0063] One or more digital schemes (numerologies) can be supported for a carrier, where the digital scheme may include a subcarrier spacing (Δf) and a cyclic prefix. A carrier can be divided into one or more BWPs with the same or different digital schemes. In some examples, UE 115 can be configured with multiple BWPs. In some examples, a single BWP for a carrier can be active at a given time, and communication for UE 115 can be restricted to one or more active BWPs.

[0064] It can be expressed in a basic unit of time (which can be, for example, T). s =1 / (Δf) max ·N f The sampling period is ) seconds, where Δf max This can represent the maximum supported subcarrier spacing, and N f The time interval for base station 105 or UE 115 can be represented as a multiple of the maximum supported Discrete Fourier Transform (DFT) size. The time interval for communication resources can be organized based on radio frames, each having a specified duration (e.g., 10 milliseconds (ms)). Each radio frame can be identified by a System Frame Number (SFN) (e.g., ranging from 0 to 1023).

[0065] 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, a frame may be divided (e.g., in the time domain) into subframes, and each subframe may be further divided into a number of time slots. Alternatively, each frame may include a variable number of time slots, and the number of time slots may depend on the subcarrier spacing. Each time slot may include a number of symbol periods (e.g., this depends on the length of the cyclic prefix added before each symbol period). In some wireless communication systems 100, time slots may be further divided into multiple micro-time slots containing one or more symbols. Excluding the cyclic prefix, each symbol period may contain one or more (e.g., N) f (Number) sampling periods. The duration of a symbol period can depend on the subcarrier spacing or the operating frequency band.

[0066] A subframe, time slot, micro-time slot, or symbol can be the smallest scheduling unit of the wireless communication system 100 (e.g., in the time domain) and can be referred to as a transmission time interval (TTI). In some examples, the duration of the TTI (e.g., the number of symbol periods in the TTI) can be variable. Alternatively, the smallest scheduling unit of the wireless communication system 100 can be dynamically selected (e.g., in a burst form of a shortened TTI (sTTI)).

[0067] Physical channels can be multiplexed on a carrier using various techniques. For example, one or more of Time Division Multiplexing (TDM), Frequency Division Multiplexing (FDM), or hybrid TDM-FDM techniques can be used to multiplex physical control channels and physical data channels on a downlink carrier. A control region (e.g., a control resource set (CORESET)) for physical control channels can be defined by the number of symbol periods and can extend across the system bandwidth or a subset of the system bandwidth of the carrier. One or more control regions (e.g., CORESETs) can be configured for a group of UEs 115. For example, one or more of the UEs 115 can monitor or search for control regions against control information based on one or more search space sets, and each search space set can include one or more control channel candidates arranged in a cascaded manner at one or more aggregation levels. The aggregation level for control channel candidates can refer to the number 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 set may include a common search space set configured to send control information to multiple UEs 115 and a UE-specific search space set used to send control information to a specific UE 115.

[0068] Each base station 105 may provide communication coverage via one or more cells (e.g., macro cells, small cells, hotspots, or other types of cells, or any combination thereof). The term "cell" may refer to a logical communication entity used (e.g., on a carrier) to communicate with base station 105 and may be associated with an identifier (ID) used to distinguish neighboring cells (e.g., Physical Cell ID (PCID), Virtual Cell ID (VCID), or other identifiers). In some examples, a cell may also refer to a geographic coverage area 110 or a portion of geographic coverage area 110 (e.g., a sector) on which a logical communication entity operates. Depending on various factors (such as the capabilities of base station 105), the range of such cells can range from small areas (e.g., structures, subsets of structures) to large areas. For example, a cell may be or include buildings, subsets of buildings, or external space between or overlapping geographic coverage areas 110, and other examples.

[0069] Macro cells typically cover a relatively large geographical area (e.g., a radius of several kilometers) and can allow unrestricted access by UE 115 with a service subscription to a network provider supporting the macro cell. In contrast, small cells can be associated with a lower-power base station 105 and can operate in the same or different (e.g., licensed, unlicensed) frequency bands as macro cells. Small cells can provide unrestricted access to UE 115 with a service subscription to a network provider, or restricted access to UE 115 associated with the small cell (e.g., UE 115 in a Closed Subscriber Group (CSG), or UE 115 associated with a user in a residence or office). Base station 105 can support one or more cells and can also support communication on one or more cells using one or more component carriers.

[0070] In some examples, a carrier can support multiple cells and can be configured with different cells based on different protocol types that can provide access for different types of devices (e.g., MTC, Narrowband IoT (NB-IoT), Enhanced Mobile Broadband (eMBB)).

[0071] In some examples, base station 105 may be mobile, and therefore provide communication coverage for mobile geographic coverage areas 110. In some examples, different geographic coverage areas 110 associated with different technologies may overlap, but different geographic coverage areas 110 may be supported by the same base station 105. In other examples, overlapping geographic coverage areas 110 associated with different technologies may be supported by different base stations 105. Wireless communication system 100 may include, for example, a heterogeneous network, in which different types of base stations 105 use the same or different radio access technologies to provide coverage for various geographic coverage areas 110.

[0072] The wireless communication system 100 can support synchronous or asynchronous operation. For synchronous operation, base stations 105 can have similar frame timings, and transmissions from different base stations 105 can be approximately time-aligned. For asynchronous operation, base stations 105 can have different frame timings, and in some examples, transmissions from different base stations 105 may not be time-aligned. The techniques described herein can be used for both synchronous and asynchronous operation.

[0073] Some UE 115s (e.g., MTC or IoT devices) can be low-cost or low-complexity devices and can provide automated machine-to-machine communication (e.g., via machine-to-machine (M2M) communication). M2M communication or MTC can refer to data communication technologies that allow devices to communicate with each other or with base station 105 without human intervention. In some examples, M2M communication or MTC can include communication from devices that have integrated sensors or meters to measure or capture information and relay such information to a central server or application that uses the information or presents it to humans interacting with the application. Some UE 115s can be designed to collect information or automate the behavior of machines or other devices. Examples of applications for MTC devices include smart metering, inventory monitoring, water level monitoring, equipment monitoring, healthcare monitoring, wildlife monitoring, climate and geological event monitoring, fleet management and tracking, remote security sensing, physical access control, and transaction-based billing.

[0074] Some UE 115s can be configured to operate in a power-saving mode, such as half-duplex communication (e.g., a mode that supports unidirectional communication via either transmission or reception, rather than simultaneous transmission and reception). In some examples, half-duplex communication may be performed at a reduced peak rate. Other power-saving techniques for UE 115 include entering a power-saving deep sleep mode when not engaged in active communication, when operating on limited bandwidth (e.g., according to narrowband communication), or a combination of these techniques. For example, some UE 115s can be configured to operate using a narrowband protocol type associated with a defined portion or range (e.g., a set of subcarriers or resource blocks (RBs) within a carrier, within a carrier's guard band, or outside a carrier.

[0075] Wireless communication system 100 can be configured to support ultra-reliable communication or low-latency communication, or various combinations thereof. For example, wireless communication system 100 can be configured to support ultra-reliable low-latency communication (URLLC) or mission-critical communication. UE 115 can be designed to support ultra-reliable, low-latency, or mission-critical functions (e.g., mission-critical functions). Ultra-reliable communication can include private or group communication and can be supported by one or more mission-critical services (such as mission-critical push-to-talk (MCPTT), mission-critical video (MCVideo), or mission-critical data (MCData)). Support for mission-critical functions can include service prioritization, and mission-critical services can be used for public safety or general commercial applications. The terms ultra-reliable, low-latency, mission-critical, and ultra-reliable low-latency are used interchangeably herein.

[0076] In some examples, UE 115 is able to communicate directly with other UE 115 on a device-to-device (D2D) communication link 135 (e.g., using peer-to-peer (P2P) or D2D protocols). One or more UE 115s utilizing D2D communication can be within the geographic coverage area 110 of base station 105. Other UE 115s in such a group may be outside the geographic coverage area 110 of base station 105 or otherwise unable to receive transmissions from base station 105. In some examples, groups of UE 115s communicating via D2D communication can utilize a one-to-many (1:M) system, where each UE 115 transmits to every other UE 115 in the group. In some examples, base station 105 facilitates the scheduling of resources for D2D communication. In other cases, D2D communication is performed between UE 115s without involving base station 105.

[0077] In some systems, the D2D communication link 135 may be an example of a communication channel (such as a sidelink communication channel) between vehicles (e.g., UE 115). In some examples, the vehicle may communicate using vehicle-to-everything (V2X) communication, vehicle-to-vehicle (V2V) communication, or some combination of these. The vehicle may signal information relating to traffic conditions, signal control, weather, safety, emergencies, or any other information relating to the V2X system. In some examples, a vehicle in a V2X system may communicate with roadside infrastructure (such as roadside units), or communicate with the network via one or more network nodes (e.g., base station 105) using vehicle-to-network (V2N) communication, or both.

[0078] Core network 130 can provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. Core network 130 can be an evolved packet core (EPC) or a 5G core (5GC), and can include at least one control plane entity (e.g., a mobility management entity (MME), access and mobility management function unit (AMF)) managing access and mobility, and at least one user plane entity (e.g., a serving gateway (S-GW), packet data network (PDN) gateway (P-GW), or user plane function unit (UPF)) routing packets to or interconnecting with external networks. The control plane entity can manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management for UE 115 served by base station 105 associated with core network 130. User IP packets can be transmitted through the user plane entity, which can provide IP address allocation and other functions. The user plane entity can connect to network operator IP service 150. Network operator IP services 150 may include access to the Internet, intranets, IP Multimedia Subsystem (IMS), or packet-switched streaming services.

[0079] Some network devices (e.g., base station 105) may include sub-components such as access network entity 140, which may be an example of an access node controller (ANC). Each access network entity 140 may communicate with UE 115 through one or more other access network transport entities 145 (which may be referred to as a radio headend, smart radio headend, or transmit / receive point (TRP)). Each access network transport entity 145 may include one or more antenna panels. In some configurations, the various functions of each access network entity 140 or base station 105 may be distributed across individual network devices (e.g., radio headends and ANCs) or incorporated into a single network device (e.g., base station 105).

[0080] Wireless communication system 100 can operate using one or more frequency bands (typically in the range of 300 MHz to 300 GHz). The region from 300 MHz to 3 GHz is often referred to as the Ultra High Frequency (UHF) region or decimeter band because the wavelength range extends from approximately one decimeter to one meter in length. UHF waves may be blocked or redirected by buildings and environmental features, but the waves can be sufficiently permeable to penetrate structures for use in macrocells to provide service to UE 115 located indoors. Compared to the transmission of smaller frequencies and longer waves in the lower 300 MHz portion of the spectrum in the High Frequency (HF) or Very High Frequency (VHF) regions, UHF wave transmission can be associated with smaller antennas and shorter distances (e.g., less than 100 km).

[0081] The wireless communication system 100 can also operate in the ultra-high frequency (SHF) region using a frequency band from 3 GHz to 30 GHz (also referred to as the centimeter band) or in the extremely high frequency (EHF) region of the spectrum (e.g., from 30 GHz to 300 GHz) (also referred to as the millimeter band). In some examples, the wireless communication system 100 can support millimeter-wave (mmW) communication between the UE 115 and the base station 105, and the EHF antennas of the corresponding device can be even smaller and more closely spaced compared to UHF antennas. In some examples, this can facilitate the use of antenna arrays within the device. However, EHF transmissions may suffer from even greater atmospheric attenuation and shorter distances compared to SHF or UHF transmissions. The techniques disclosed herein can be employed across transmissions using one or more different frequency regions, and the designated use of frequency bands across these frequency regions may vary depending on the country or regulatory authority.

[0082] Wireless communication system 100 may utilize both licensed and unlicensed radio frequency spectrum bands. For example, wireless communication system 100 may employ Licensed Assisted Access (LAA), LTE Unlicensed (LTE-U) radio access technology, or NR technology in unlicensed frequency bands (such as the 5 GHz Industrial, Scientific, and Medical (ISM) band). When operating in unlicensed radio frequency spectrum bands, devices (such as base station 105 and UE 115) may employ carrier sensing for collision detection and avoidance. In some examples, operation in unlicensed frequency bands may be based on carrier aggregation configurations that combine component carriers operating in licensed frequency bands (e.g., LAA). Operation in unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, and other examples.

[0083] Base station 105 or UE 115 may be equipped with multiple antennas, which can be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communication, or beamforming. The antennas of base station 105 or UE 115 may be located within one or more antenna arrays or antenna panels (which may support MIMO operation or transmit or receive beamforming). For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly, such as an antenna tower. In some examples, the antennas or antenna arrays associated with base station 105 may be located in different geographical locations. Base station 105 may have an antenna array having a number of rows and columns of antenna ports that base station 105 can use to support beamforming for communication with UE 115. Similarly, UE 115 may have one or more antenna arrays that can support various MIMO or beamforming operations. Additionally or alternatively, antenna panels may support radio frequency beamforming for signals transmitted via antenna ports.

[0084] Base station 105 or UE 115 can use MIMO communication to utilize multipath signal propagation and improve spectral efficiency by transmitting or receiving multiple signals via different spatial layers. Such a technique can be called spatial multiplexing. For example, a transmitting device can transmit multiple signals via different antennas or different combinations of antennas. Similarly, a receiving device can receive multiple signals via different antennas or different combinations of antennas. Each of the multiple signals can be referred to as a separate spatial stream and can carry bits associated with the same data stream (e.g., the same codeword) or different data streams (e.g., different codewords). Different spatial layers can be associated with different antenna ports used for channel measurement and reporting. MIMO techniques include single-user MIMO (SU-MIMO) (where multiple spatial layers are transmitted to the same receiving device) and multi-user MIMO (MU-MIMO) (where multiple spatial layers are transmitted to multiple devices).

[0085] Beamforming (also known as spatial filtering, directional transmission, or directional reception) is a signal processing technique that can be used at a transmitting or receiving device (e.g., base station 105, UE 115) to form or guide an antenna beam (e.g., transmit beam, receive beam) along a spatial path between the transmitting and receiving devices. Beamforming can be achieved by combining signals transmitted via antenna elements of an antenna array such that some signals propagating relative to a specific orientation of the antenna array experience constructive interference, while others experience destructive interference. Adjustments to the signals transmitted via the antenna elements can include applying amplitude offset, phase offset, or both to the signals carried via the antenna elements associated with the transmitting or receiving device. The adjustments associated with each antenna element can be defined by a set of beamforming weights associated with a specific orientation (e.g., relative to the antenna array of the transmitting or receiving device, or relative to some other orientation).

[0086] As part of beamforming operations, base station 105 or UE 115 may use beam scanning techniques. For example, base station 105 may use multiple antennas or antenna arrays (e.g., antenna panels) to perform beamforming operations for directional communication with UE 115. Base station 105 may transmit some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) multiple times in different directions. For example, base station 105 may transmit signals according to different sets of beamforming weights associated with different transmission directions. Transmissions in different beam directions may be used (e.g., by a transmitting device (such as base station 105) or by a receiving device (such as UE 115)) to identify the beam direction for subsequent transmissions or receptions performed by base station 105.

[0087] Base station 105 may transmit signals (e.g., data signals associated with a specific receiving device, such as UE 115) in a single beam direction (e.g., a direction associated with a particular receiving device, such as UE 115). In some examples, the beam direction associated with transmission along a single beam direction may be determined based on signals transmitted in one or more beam directions. For example, UE 115 may receive one or more signals transmitted by base station 105 in different directions and may report to base station 105 an indication of the signal received by UE 115 that has the highest signal quality or otherwise acceptable signal quality.

[0088] In some examples, multiple beam directions can be used to perform transmissions by a device (e.g., base station 105 or UE 115), and the device can use a combination of digital precoding or radio frequency beamforming to generate combined beams for (e.g., from base station 105 to UE 115) transmissions. UE 115 can report feedback indicating precoding weights for one or more beam directions, and this feedback can correspond to a configured number of beams spanning the system bandwidth or one or more subbands. Base station 105 can transmit reference signals that can be precoded or unprecoded (e.g., cell-specific reference signals (CRS), channel state information reference signals (CSI-RS)). UE 115 can provide feedback on beam selection, which can be a precoding matrix indicator (PMI) or codebook-based feedback (e.g., multi-panel type codebook, linear combination type codebook, port selection type codebook). Although these techniques are described with reference to signals transmitted by base station 105 in one or more directions, UE 115 may employ similar techniques to transmit signals multiple times in different directions (e.g., to identify beam directions for subsequent transmissions or receptions by UE 115) or to transmit signals in a single direction (e.g., to transmit data to a receiving device).

[0089] When receiving various signals (such as synchronization signals, reference signals, beam selection signals, or other control signals) from base station 105, the receiving device (e.g., UE 115) can attempt multiple receiving configurations (e.g., directional listening). For example, the receiving device can attempt multiple receiving directions by receiving via different antenna subarrays, by processing the received signals according to different antenna subarrays, by receiving according to different sets of receiving beamforming weights applied to signals received at multiple antenna elements of the antenna array (e.g., different sets of directional listening weights), or by processing the received signals according to different sets of receiving beamforming weights applied to signals received at multiple antenna elements of the antenna array (any of these operations can be referred to as "listening" according to different receiving configurations or receiving directions). In some examples, the receiving device can use a single receiving configuration to receive along a single beam direction (e.g., when receiving data signals). A single receiver configuration can be aligned to a beam direction determined based on listening in different receiver configuration directions (e.g., a beam direction determined to have the highest signal strength, highest signal-to-noise ratio (SNR), or otherwise acceptable signal quality based on listening in multiple beam directions).

[0090] The wireless communication system 100 can be a packet-based network operating according to a layered protocol stack. In the user plane, communication at the bearer or Packet Data Convergence Protocol (PDCP) layer can be IP-based. The Radio Link Control (RLC) layer can perform packet fragmentation and reassembly for transmission over logical channels. The Media Access Control (MAC) layer can perform priority handling and multiplexing of logical channels to transport channels. The MAC layer can also use error detection techniques, error correction techniques, or both to support retransmissions at the MAC layer to improve link efficiency. In the control plane, the Radio Resource Control (RRC) protocol layer can provide the establishment, configuration, and maintenance of RRC connections (which support radio bearers for user plane data) between the UE 115 and the base station 105 or core network 130. At the physical layer, transport channels can be mapped to physical channels.

[0091] UE 115 and base station 105 can support data retransmission to increase the likelihood of successful data reception. Hybrid Automatic Repeat Request (HARQ) feedback is a technique used to increase the likelihood of correct data reception on communication link 125. HARQ can include a combination of error detection (e.g., using Cyclic Redundancy Check (CRC)), forward error correction (FEC), and retransmission (e.g., Automatic Repeat Request (ARQ)). HARQ can improve throughput at the MAC layer under poor radio conditions (e.g., low signal and noise conditions). In some examples, the device can support same-slot HARQ feedback, where the device can provide HARQ feedback for data received in a previous symbol within a specific time slot. In other cases, the device can provide HARQ feedback in subsequent time slots or according to some other time interval.

[0092] In some examples, UE 115 can reuse resources used for receiving sidelink transmissions. For example, first UE 115 can receive a first-level SCI from transmitting UE 115. The first-level SCI can be sent or broadcast to first UE 115 and one or more other sidelink UEs 115 to indicate resources reserved for retransmission and reduce interference. First UE 115 can then monitor a second-level SCI from transmitting UE 115. In some examples, the second-level SCI can be sent via reserved resources indicated by the first-level SCI, which can be resources of a sidelink data channel (such as PSSCH). The second-level SCI can indicate which reserved resources transmitting UE 115 can use for sidelink transmissions. If first UE 115 fails to decode the second-level SCI, or if first UE 115 determines that transmitting UE 115 is at a safe distance from first UE 115, then first UE 115 can determine to use the reserved resources indicated by the first-level SCI. For example, UE 115 can transmit the first-level SCI over a larger coverage area than the second-level SCI, and UE 115 can be located within the first-level SCI coverage area but not within the second-level SCI coverage area. UE 115 can determine where to reuse resources in an interference-free area. UE 115 can determine the available resource set based on monitoring the second control channel, unsuccessful decoding of the second side link control channel, or the interference-free distance of UE 115.

[0093] Figure 2 An example of a wireless communication system 200 according to various aspects of this disclosure is shown. The wireless communication system 200 may include a base station 105-a and UEs 115-a, 115-b, and 115-c, which may be as described in reference... Figure 1 Examples of base station 105 and UE 115 described. Base station 105-a and UEs 115-a and 115-c may communicate within geographic coverage area 110-a and via communication links 205-a and 205-b, respectively. UE 115-c may communicate with UEs 115-a and 115-b via sidelink communication links 210-a and 210-b, respectively. In some examples, UE 115-c may send an SCI to UEs 115-a and 115-b via sidelink control resource 220, and the SCI may include an indication of resources reserved for retransmissions performed by UE 115-c (e.g., reserved resource 225). In some examples, UEs 115-a and 115-b may determine to reuse one or more of the reserved resources 225.

[0094] In some wireless communication systems 200, devices in the network (e.g., UE 115, base station 105, or other nodes) can transmit SCIs to another device (e.g., another sidelink device or a vehicle-to-everything (V2X) device). SCIs can be transmitted in one or more levels. For example, a sidelink UE 115-c can send a first-level SCI (e.g., SCI1) via sidelink communication link 210 to each sidelink UE 115 in the network (e.g., UEs 115-a and 115-b). The first-level SCI can indicate resources reserved by UE 115-c for retransmission (e.g., SCI1 can indicate reserved resource 225), and each sidelink UE 115 can decode the first-level SCI to determine where the reserved resource 225 is located (e.g., avoiding the use of resources reserved for transmission on the other sidelink and reducing resource conflicts within the wireless communication system 200). In one example (e.g., during mode 2 sidelink operation), the sidelink UE 115 can perform channel sensing (e.g., blind decoding of each PSCCH 235) to locate resources reserved by other sidelink transmissions, and the first-level SCI can reduce the need to sense each channel (e.g., the first-level SCI can include explicit indications that allow UE 115 to avoid blind decoding of each channel). The first-level SCI can be transmitted via sidelink control resource 220, which can be a configuration resource (e.g., time or frequency resource) transmitted via PSCCH 235. In some examples, PSCCH 235 can be configured to occupy multiple physical resource blocks (PRBs) within a single subchannel 250 (e.g., 10, 12, 15, 20, 25, or some other number of PRBs within subchannel 250), and the duration of PSCCH 235 can be configured (e.g., PSCCH 235 can span two symbols, three symbols, or some other number of symbols 255).

[0095] The first-level SCI may include one or more fields to indicate the location of reserved resources 225. For example, the first-level SCI may include one or more fields to convey frequency domain resource allocation (FDRA), time domain resource allocation (TDRA), resource reservation period 245 (e.g., the period for repeated SCI transmissions and corresponding reserved resources 225), MCS for the second-level SCI 240, beta offset value for the second-level SCI 240, DMRS port (e.g., one bit indicating the number of data layers), physical side link feedback channel (PSFCH) overhead indicator, priority, one or more additional reservation bits, or a combination thereof. In some examples, the FDRA can be multiple bits in the first-level SCI that indicate the number of time slots and sub-channels 250 reserved for reserved resource 225 (e.g., receiving UE 115 can determine the location of reserved resource 225 based on the FDRA by using sub-channels 250, including PSCCH 235 and the first-level SCI, as a reference), and the TDRA can be multiple bits in the first-level SCI (e.g., five bits, nine bits, or some other number of bits) that indicate the amount of time resources allocated to reserved resource 225. Therefore, the first-level SCI can indicate reserved resource 225 to one or more sidelink UEs 115 in the network.

[0096] The sidelink UE 115 may attempt to decode the reserved resource 225 indicated by the Level 1 SCI. In one example, the reserved resource 225 may be used for retransmission of sidelink data or the Level 1 SCI. Alternatively, the reserved resource 225 may include resources for sidelink transmissions such as PSSCH 230. PSSCH 230 may be transmitted via one or more subchannels 250 and may include multiple symbols 255. In some examples, PSSCH 230 may include PSCCH 235 (e.g., PSCCH 235 may be transmitted via one or more full or partial symbols 255 of PSSCH 230 via one or more time or frequency resources). The Level 2 SCI 240 may be transmitted via one or more symbols 255 of PSSCH 230 (e.g., SCI2 may be preloaded and transmitted via one or more start symbols 255 of the start symbols 255 of PSSCH 230). The second-level SCI 240 may include indications of which reserved resources 225 can be used by the transmitting UE 115 for sidelink transmissions, and the second-level SCI 240 can thus be received and decoded by the sidelink UE 115 intending to receive and decode the corresponding sidelink communication. In some examples, the second-level SCI 240 may include one or more fields (e.g., bit fields) that may indicate one or more parameters for locating the resources to be used and decoding the PSSCH 230. For example, the second-level SCI 240 may include a HARQ ID, a HARQ enable or disable bit, a New Data Indicator (NDI), a Redundancy Version (RV) ID, a source ID, a destination ID, or some combination thereof.

[0097] To reduce interference during the transmission of the second-level SCI 240, the transmitting UE 115 can utilize a larger coverage area compared to PSSCH 230 (e.g., PSSCH 230 including the second-level SCI 240) to transmit the first-level SCI. For example, UE 115-c can transmit the first-level SCI to UEs 115-a, 115-b, and one or more other sidelink UEs 115 within the SCI coverage area, but UE 115-c can transmit PSSCH 230 and the corresponding second-level SCI 240 within a smaller coverage area (e.g., the second-level SCI 240 can be sent to the intended receiving UEs 115 (such as UEs 115-a and 115-b) instead of other UEs 115). Therefore, the area used for the throughput of sidelink transmissions may be limited by the radius of the first-level SCI coverage area.

[0098] To improve throughput for sidelink transmissions, sidelink UE 115 can decode first-level SCI transmissions from transmitting UE 115, and sidelink UE 115 can determine to reuse reserved resources 225 indicated by the first-level SCI. For example, transmitting UE 115-c can transmit the first-level SCI to UE 115-b and one or more other UEs 115 within the first-level SCI coverage area via sidelink control resource 220 (e.g., sidelink control resource 220 may be located within PSCCH 235). However, in some cases, UE 115-b may avoid decoding the second-level SCI 240 from UE 115-c (e.g., UE 115-a may be outside the coverage area of ​​the second-level SCI 240, UE 115-c may not intend for UE 115-b to receive the corresponding sidelink communication, UE 115-b may not be able to decode the resources indicated by the first-level SCI, or some combination thereof), and UE 115-b may alternatively determine to use the indicated resources. Additionally or alternatively, UE 115-b may determine a safe distance between the sending UE 115-c and UE 115-b, and UE 115-b may determine to use reserved resources 225. For example, UE 115-b may perform one or more distance measurements and path loss measurements to determine an interference-free coverage area for reusing the indicated reserved resources 225.

[0099] In some examples, to determine the interference-free distance (e.g., RF distance) to the boundary of the PSSCH coverage area for reuse of indicated resources, the sidelink UE 115 can determine the distance to the transmitting UE 115 (e.g., distance 215 such as between UE 115-b and transmitting UE 115-c) and the radius of the PSSCH coverage area. The sidelink UE 115 can calculate the interference-free RF distance by subtracting the radius of the PSSCH coverage area from the distance to the transmitting UE 115. For example, UE 115-b can receive a Level 1 SCI from UE 115-c, and UE 115-b can attempt to measure the interference-free RF distance to reuse reserved resources indicated by the Level 1 SCI. UE115-b can perform power measurements to estimate the distance 215 to UE115-c, and UE115-b can determine the radius of the PSSCH coverage area based on information in the first-level SCI decoded by UE115-b (e.g., UE115-b decodes the first-level SCI and identifies one or more of the formats of MCS, beta offset, and PSSCH resources). Therefore, UE115-b can determine the interference-free RF distance by subtracting the radius of the PSSCH coverage area from the distance 215 to UE115-c. Thus, UE115-b can reuse resources indicated by the first-level SCI within a coverage area with a radius not greater than the determined RF distance.

[0100] Therefore, the sidelink UE 115 can receive a first-level SCI identifying the reserved resource set from the sending UE 115, and the sidelink UE 115 can determine the reuse of resources to improve the throughput for sidelink communication. UE 115 can determine the coverage area for reusing resources without interfering with existing sidelink transmissions.

[0101] Figure 3 An example of a coverage area diagram 300 according to various aspects of this disclosure is shown. Coverage area diagram 300 may include UEs 115-d, 115-e, 115-f, and 115-g, which may be as shown in reference... Figure 1 and 2 An example of UE 115 is described. Coverage area diagram 300 may include SCI coverage area 325 and PSSCH coverage area 330 (e.g., PSSCH coverage areas 330-a, 330-b, and 330-c). SCI coverage area 325 may indicate the coverage area of ​​a first-level SCI transmission, and PSSCH coverage area 330 may indicate the coverage area of ​​a corresponding PSSCH transmission that may include a second-level SCI (e.g., the second-level SCI may be transmitted via a control channel within the PSSCH), as shown in reference. Figure 2Described. In some examples, UE 115 may determine to reuse one or more resources indicated by the first-level SCI. For example, UE 115 may determine RF distances 305 (e.g., RF distances 305-a, 305-b, and 305-c) for reusing the indicated resources with reduced interference.

[0102] In some examples, the coverage area of ​​the first-level SCI can be configured by the network. For example, the network can configure UE 115-e to transmit the first-level SCI within SCI coverage area 325 (e.g., UE 115-e can be configured to transmit the first-level SCI within SCI coverage area 325 using configured transmit power, via configured transmit resources, or both). Each UE 115 within SCI coverage area 325 can receive the first-level SCI, which includes an indication of reserved resources for sidelink communication associated with UE 115-e. Reserved resources (e.g., PSSCH resources) can include second-level SCIs, as referenced... Figure 2 As described. In some examples, SCI coverage area 325 may indicate resource reservations to each UE 115 in the network (e.g., SCI coverage area 325 may be large enough to reach every surrounding UE 115 and improve coverage and reliability within the network).

[0103] In some examples, the coverage of PSSCH and second-level SCI transmissions may be limited by the SCI radius 320 of the SCI coverage area 325. For example, sidelink data and second-level SCI transmitted via PSSCH coverage area 330-a may be intended for a group of receiving UEs 115 (e.g., a group of UEs 115 receiving sidelink data via resources indicated by the first-level SCI), rather than every UE 115 in the network, and therefore, PSSCH coverage area 330-a may be smaller than SCI coverage area 325. Alternatively, PSSCH coverage area 330-a may be smaller than SCI coverage area 325 to reduce interference during second-level SCI transmission. In some examples, coverage area parameters may be configured to determine the PSSCH radius 310 (e.g., coverage area parameters may be determined based on path loss exponent, signal-to-interference-plus-noise ratio (SINR) target, etc.). For example, the PSSCH radius 310 can be a multiple of the coverage area parameter smaller than the SCI radius 320 (e.g., the PSSCH radius 310 can be referred to as R2, the SCI radius 320 as R1, the coverage area parameter can be referred to as α, and α can be determined such that R1 ≥ αR2). In one example (e.g., during free-space omnidirectional transport), the coverage area parameter can be two, and the PSSCH radius can be twice the size of the SCI radius 320.

[0104] As described herein, spatial reuse of resources can be improved if UE 115 determines to reuse the resources indicated by the Level 1 SCI. For example, if UE 115-f receives and decodes the Level 1 and Level 2 SCIs from UE 115-e, UE 115-f can receive sidelink transmissions via the reserved resources indicated by the Level 1 and Level 2 SCIs. However, if UE 115-f is outside the PSSCH coverage area 330-a (e.g., UE 115-f cannot receive or decode the Level 2 SCI), UE 115-f can improve the throughput area for sidelink transmissions by determining an interference-free distance for reusing the resources indicated by the Level 1 SCI. If UE 115-f determines that the interference-free distance is greater than a threshold distance, UE 115-f can reuse the reserved resources. The threshold distance can be determined based on an alpha factor α, which can correspond to the path loss exponent, SINR target, spatial transmission type, or some combination thereof. The area used for lateral link transmission throughput can be inversely proportional to the SCI radius (e.g., AreaSE). V2X ~1 / π(R1) 2 Furthermore, if reserved resources indicated by the first-level SCI are reused, the throughput area can increase by an alpha factor squared (e.g., AreaSE). Proposal ≥α 2 AreaSE V2X In one example, if the alpha factor is two, the throughput area can increase by more than four times.

[0105] UE 115 can determine coverage areas for reusing resources to avoid interference with existing SCI coverage area 325 and PSSCH coverage area 330-a. For example, UEs 115-f and 115-g can be located within SCI coverage area 325 but outside the corresponding PSSCH coverage area 330-a. UEs 115-f and 115-g can thus determine to reuse reserved resources indicated by the first-level SCI within new PSSCH coverage areas 330-b and 330-c, respectively (e.g., PSSCH coverage areas 330-b and 330-c can be examples of the corresponding UE 115 determining new PSSCH transmission resources and new transmit power for resource reuse). The radius of PSSCH coverage area 330-b can be different from the PSSCH radius 310. Alternatively or concurrently, the radius of PSSCH coverage area 330-b can be the same as or different from the radius of PSSCH coverage area 330-c. For example, the radius of each new PSSCH coverage area 330 can be determined by the RF distance 305 (e.g., interference-free distance) to the boundary of the PSSCH coverage area 330-a, and each RF distance 305 can be determined by the corresponding UE 115 for reusing reserved resources with reduced interference.

[0106] In some examples, to determine RF distance 305, the sidelink UE 115 can determine the distance to the transmitting UE 115 (e.g., the UE 115 transmitting the first-level SCI, such as UE 115e) and the radius of the corresponding PSSCH coverage area 330. The interference-free RF distance 305 can be determined by subtracting the radius of the PSSCH coverage area 330 from the distance to the transmitting UE 115. For example, UE 115-d may be within the SCI coverage area 325 and outside the PSSCH coverage area 330-a, and UE 115-d can determine RF distance 305-a to reuse the resources indicated by the first-level SCI. In some examples, UE 115-d may perform a power measurement to estimate the distance 315 to the transmitting UE 115-e. For example, UE 115-d can use DMRS decoded from the first-level SCI (e.g., or in some examples, the second-level SCI) to estimate the path loss (e.g., RSRP loss, such as PL) for transmitting UE 115-e. RSRP(or Reference Signal Strength Indicator (RSSI) measurement). UE 115-d can determine the distance 315 to the transmitting UE 115-e based on path loss estimation. In some examples, the distance 315 to the transmitting UE 115-e may be referred to as D. UE 115-d can determine the PSSCH radius 310 based on information in the first-level SCI decoded by UE 115-d. For example, UE 115-d can decode the first level and identify one or more of the MCS, the beta offset for the second-level SCI, and the format of the PSSCH resource that can indicate the PSSCH radius 310. Each parameter in the corresponding parameters in the PSSCH radius 310 and the first-level SCI can be configured by the network (e.g., as an example, if the beta offset is one, the PSSCH radius 310 could be 10 meters, etc.). In some examples, the PSSCH radius 310 may be referred to as R2. UE 115-d can determine the RF distance 305-a by subtracting the PSSCH radius 310 from the distance 315 to UE 115-e (e.g., the RF distance 305-a can be determined by d2 = D - R2, which may be referred to as d2). UE 115-d can therefore reuse the resources indicated by the Level 1 SCI within a new PSSCH coverage area 330 with a radius not greater than the determined RF distance 305-a (e.g., a radius less than or equal to d2). In some examples, the RF distance 305 may be an interference-free distance or may be associated with interference below a threshold.

[0107] UE 115-d may determine the new PSSCH coverage area 330 based on RF distance, resources indicated by the first-level SCI, a new PSSCH coverage area 330 determined by another UE 115, or some combination thereof. For example, UE 115-d may receive one or more first-level SCI transmissions, and each first-level SCI may indicate a corresponding set of reserved resources for sidelink communication. UE 115-d may determine to reuse any combination of resources indicated by the first-level SCI transmissions (e.g., UE 115-d may receive 10 or some other number of first-level SCI transmissions, and UE 115-d may reuse combinations of subchannels indicated by each first-level SCI transmission). Alternatively or additionally, UE 115-d may determine to reuse one or more resources indicated by the first-level SCI and one or more unoccupied resources (e.g., unoccupied resources with similar permitted transmit power). In another example, if one or more UEs 115 reserve the same subchannel, then UE 115-d can receive first-level SCI transmissions from each UE 115, and UE 115-d can determine to reuse resources within a PSSCH coverage area 330 with a radius less than or equal to the minimum RF distance 305 indicated by the first-level SCI transmissions.

[0108] As described herein, the sidelink UE 115 can receive a Level 1 SCI and determine the area of ​​reserved sidelink resources indicated by the Level 1 SCI for reuse to improve throughput for receiving sidelink transmissions. The UE 115 can thus reduce latency associated with sidelink communication and use fewer resources to receive sidelink transmissions.

[0109] Figure 4 An example of a coverage area diagram 400 according to various aspects of this disclosure is shown. Coverage area diagram 400 may include UEs 115-h and 115-i, which may be as shown in reference... Figure 1-3 An example of UE 115 is described. Coverage area diagram 400 may include SCI coverage area 425 (e.g., SCI coverage areas 425-a and 425-b) and PSSCH coverage area 430 (e.g., PSSCH coverage areas 430-a and 430-b), which may be as shown in the reference. Figure 3Examples of SCI coverage area 325 and PSSCH coverage area 330 are described. In some examples, UE 115-i may determine to reuse one or more resources indicated by the first-level SCI sent by UE 115-h. UE 115-i may broadcast a new first-level SCI within SCI coverage area 425-b to notify other receiving UEs 115 of the location of the new PSSCH resource and that the resource is occupied. UE 115-i may utilize one or more methods to reduce interference between the original SCI coverage area 425-a and the new SCI coverage area 425-b.

[0110] exist Figure 4 In the example, UE 115-i can receive and decode the first-level SCI from UE 115-h within SCI coverage area 425-a, but UE 115-i may not be able to receive and decode the corresponding second-level SCI transmitted within PSSCH coverage area 430-a. UE 115-i can alternatively measure the RF distance 405 and determine how to reuse the resources indicated by the first-level SCI in a new PSSCH coverage area 430-b without interfering with PSSCH coverage area 430-a, as shown in the reference. Figure 2 and 3 Described. UE 115-i can send a new Level 1 SCI transmission to inform receiving UE 115 where it receives and decodes side-link transmissions, and to indicate to other UE 115s that resources are being reused within PSSCH coverage area 430-b (e.g., UE 115-i can broadcast the Level 1 SCI to each UE 115 in SCI coverage area 425-b). However, in some examples, the new SCI coverage area 425-b may interfere with the original SCI coverage area 425-a, the original PSSCH coverage area 430-a, or both (e.g., overlap, such as...). Figure 4 (As shown). For example, the new SCI coverage area 425-b may include an SCI radius 420 that can overlap with the original SCI coverage area 425-a.

[0111] UE 115-i can utilize one or more methods to reduce interference between new Level 1 SCI transmissions and existing Level 1 SCI transmissions. In some examples, the PSCCH including the Level 1 SCI can be transmitted via the subchannel with the lowest index within the data channel (e.g., in one example, if the data channel includes subchannel indices 0 to 5, the PSCCH can be transmitted via subchannel 0). In a first method for reducing interference between SCI transmissions, UE 115-i can receive the original Level 1 SCI transmission from UE 115-h via a first subchannel, and UE 115-i can avoid reusing the first subchannel (e.g., existing subchannels can be avoided). Alternatively or additionally, the location of the Level 1 SCI can be relaxed so that UE 115-i can transmit the new Level 1 SCI in a different subchannel than the original Level 1 SCI transmission. For example, if the Level 1 SCI transmitted by UE 115-h is transmitted via a first subchannel location within the data channel, UE 115-i can identify another subchannel location for transmitting the new SCI (e.g., via a subchannel with a subchannel index greater than 0). UE 115-i can send an indication of the location of the first-level SCI to the receiving UE 115 (e.g., via a field in the first-level SCI or the second-level SCI).

[0112] In some examples, the new Level 1 SCI transmission may include the same information as the original Level 1 SCI transmission (e.g., the same priority, DMRS mode, and SCI2 format). In such examples, UE 115-i may transmit the new Level 1 SCI via the same subchannel as the original Level 1 SCI. However, if the new Level 1 SCI is the same as the original Level 1 SCI, the format of the Level 2 SCI may be the same (e.g., the Level 1 SCI may indicate that the new PSSCH coverage area 430-b is the same as the existing PSSCH coverage area 430-a). In such cases, to avoid interfering with existing PSSCH and Level 2 SCI transmissions while reusing resources, UE 115-i may determine a separate transmit power for the new Level 2 SCI to reduce interference with existing Level 2 SCI transmissions (e.g., the transmit power for the Level 2 SCI may differ from the Level 2 SCI format indicated via the Level 1 SCI). UE 115-i may determine the transmit power based on RF distance 405, based on unsuccessful decoding of the Level 2 SCI, or both. In one example, UE 115-i can instruct the receiving UE 115 to control transmit power via a beta offset value.

[0113] By utilizing one of the described methods to reduce interference, UE 115-i can transmit (e.g., broadcast) new Level 1 SCI transmissions within a new SCI coverage area 425-b without interfering with existing Level 1 SCI transmissions via SCI coverage area 425-a or existing Level 2 SCI transmissions via PSSCH coverage area 430-a, using new transmit power, new transmit resources, new subchannels, or some combination thereof. Therefore, UE 115-i can improve spatial reuse of sidelink resources and increase the area available for throughput of sidelink data transmissions.

[0114] Figure 5 Examples of process flow 500 according to various aspects of this disclosure are shown. In some examples, process flow 500 may implement aspects of wireless communication system 100 or 200 or coverage area diagram 300 or 400. Process flow 500 shows UE 115-j and UE 115-k (which may be as referenced) Figure 1 Communication between UEs 115 (examples described). It should be understood that the devices and nodes described via process flow 500 can communicate or couple with other devices or nodes not shown. For example, UEs 115-j and 115-k can communicate with one or more other UEs 115. Alternative examples are possible, some of which may be performed in a different order than described or not at all. In some cases, steps may include additional features not mentioned below, or additional steps may be added.

[0115] At 505, UE 115-j can receive a first sidelink control channel from UE 115-k. The first sidelink control channel may include a first-level SCI and may indicate a set of reserved resources for sidelink communication associated with UE 115-k.

[0116] At 510, in some examples, UE 115-j can receive a second sidelink control channel from UE 115-k. The second sidelink control channel may include a second-level SCI. In some cases, the second-level SCI may indicate to UE 115-k which reserved resources from the reserved resources indicated by the first-level SCI can be used for sidelink communication.

[0117] At 515, UE 115-j can decode the second side crosslink control channel from UE 115-k based on the first side crosslink control channel received at 505. In one example, UE 115-j can attempt to decode the second side crosslink control channel to receive side crosslink transmissions from UE 115-k.

[0118] At 520, in some examples, UE 115-j can determine a first distance from UE 115-k. This first distance can correspond to the difference between the radius of the second-side cross-link control channel and the distance between UE 115-j and UE 115-k. In some examples, this first distance can be referred to as the interference-free distance. The interference-free distance can be determined based on the results of the decoding process of the second-side cross-link control channel.

[0119] At point 525, UE 115-j can determine that the set of reserved resources indicated by the first-side cross-link control channel is available. UE 115-j can determine the availability of the reserved resource set based on the decoding of the second-side cross-link control channel, the radius of the second-side cross-link control channel, and the distance between UE 115-j and UE 115-k. In some examples, UE 115-j can determine that UE 115-j can reuse the reserved resource set within a first distance corresponding to the difference between the distance between UE 115-j and UE 115-k and the radius of the second-side cross-link control channel.

[0120] At 530, in some examples, UE 115-j can communicate with UE 115-k via a reserved resource set. UE 115-j can communicate with UE 115-k via the reserved resource set based on a determination at 525 that the reserved resource set is available for use by UE 115-j.

[0121] Figure 6 A block diagram 600 of a device 605 supporting space reuse for lateral link communication according to various aspects of this disclosure is shown. Device 605 may be an example of various aspects of UE 115 as described herein. Device 605 may include a receiver 610, a communication manager 615, and a transmitter 620. Device 605 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0122] Receiver 610 can receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to space reuse for sidelink communication). It can pass this information to other components of device 605. Receiver 610 can be a reference... Figure 9 Examples of various aspects of the transceiver 920 are described. The receiver 610 can utilize a single antenna or a set of antennas.

[0123] The communication manager 615 can perform the following operations: receive from the second UE a first sidelink control channel indicating a set of reserved resources for sidelink communication associated with the second UE; decode a second sidelink control channel from the second UE based on the first sidelink control channel; and determine that the set of reserved resources is available for use by the first UE based on the decoding of the second sidelink control channel, the radius of the second sidelink control channel, and the distance between the first UE and the second UE. The communication manager 615 can also perform the following operations: receive from the second UE a first sidelink control channel indicating a set of reserved resources for sidelink communication associated with the second UE; monitor a second sidelink control channel from the second UE based on the first sidelink control channel; and determine that the set of reserved resources is available for use by the first UE based on the monitoring of the second sidelink control channel, wherein the set of reserved resources is determined to be available based on unsuccessful decoding of the second sidelink control channel. The communication manager 615 can be an example of various aspects of the communication manager 910 described herein.

[0124] The communication manager 615 or its sub-components may be implemented in hardware, processor-executable code (e.g., software or firmware), or any combination thereof. If implemented in processor-executable code, the functionality of the communication manager 615 or its sub-components may be performed by a general-purpose processor, DSP, application-specific integrated circuit (ASIC), field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof, designed to perform the functions described in this disclosure.

[0125] The communication manager 615 or its subcomponents may be physically located at various locations, including being distributed such that some functions are implemented by one or more physical components at different physical locations. In some examples, according to various aspects of this disclosure, the communication manager 615 or its subcomponents may be separate and distinct components. In some examples, according to various aspects of this disclosure, the communication manager 615 or its subcomponents may be combined with one or more other hardware components, including but not limited to input / output (I / O) components, transceivers, network servers, other computing devices, one or more other components described in this disclosure, or combinations thereof.

[0126] Transmitter 620 can transmit signals generated by other components of device 605. In some examples, transmitter 620 may be co-located with receiver 610 in a transceiver module. For example, transmitter 620 may be a reference... Figure 9 Examples of various aspects of the transceiver 920 are described. The transmitter 620 can utilize a single antenna or a set of antennas.

[0127] A communication manager 615 as described herein can be implemented to achieve one or more potential advantages. One implementation may allow device 605 to increase throughput for sidelink transmissions by reusing resources reserved for sidelink communication. For example, device 605 (e.g., sidelink UE 115) may receive first-level SCI transmissions, and device 605 may determine to reuse reserved resources indicated by the first-level SCI. In some examples, device 605 may determine the RF distance to the boundary of existing sidelink data and SCI transmissions, and device 605 may reuse resources within a coverage area with a radius less than or equal to the RF distance. Therefore, device 605 may reduce interference with existing sidelink transmissions, and device 605 may increase the area for receiving sidelink transmission throughput.

[0128] Alternatively, device 605 may utilize unused resources. For example, some resources indicated by the first-level SCI may be associated with a low utilization probability, and device 605 may determine to reuse these resources. One implementation may allow device 605 to reuse resources that might otherwise be wasted, and device 605 may use fewer resources to receive sidelink transmissions. Therefore, device 605 can reduce latency associated with communication and thereby improve the user experience.

[0129] Figure 7 A block diagram 700 of a device 705 supporting spatial reuse for lateral link communication according to various aspects of this disclosure is shown. Device 705 may be an example of aspects of device 605 or UE 115 as described herein. Device 705 may include a receiver 710, a communication manager 715, and a transmitter 740. Device 705 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0130] Receiver 710 can receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to space reuse for sidelink communication). It can pass this information to other components of device 705. Receiver 710 can be a reference... Figure 9 Examples of various aspects of the transceiver 920 are described. The receiver 710 can utilize a single antenna or a set of antennas.

[0131] Communication manager 715 may be an example of aspects of communication manager 615 as described herein. Communication manager 715 may include a side link control receiver 720, a side link control decoder 725, a reserved resource manager 730, and a side link control monitor 735. Communication manager 715 may be an example of aspects of communication manager 910 as described herein.

[0132] The sidelink control receiver 720 can receive a first sidelink control channel from the second UE, which indicates a set of reserved resources for sidelink communication associated with the second UE.

[0133] The sidelink control decoder 725 can decode the second sidelink control channel from the second UE based on the first sidelink control channel.

[0134] The reserved resource manager 730 can determine the set of reserved resources available for use by the first UE based on the decoding of the second-side cross-link control channel, the radius of the second-side cross-link control channel, and the distance between the first UE and the second UE.

[0135] The sidelink control receiver 720 can receive a first sidelink control channel from the second UE, which indicates a set of reserved resources for sidelink communication associated with the second UE.

[0136] The sidelink control monitor 735 can monitor the second sidelink control channel from the second UE based on the first sidelink control channel.

[0137] The reserved resource manager 730 can determine that a set of reserved resources is available for use by the first UE based on monitoring of the second-side cross-link control channel, wherein the set of reserved resources is determined to be available based on unsuccessful decoding of the second-side cross-link control channel.

[0138] Transmitter 740 can transmit signals generated by other components of device 705. In some examples, transmitter 740 can be co-located with receiver 710 in a transceiver module. For example, transmitter 740 can be a reference... Figure 9 Examples of various aspects of the transceiver 920 are described. The transmitter 740 can utilize a single antenna or a set of antennas.

[0139] Figure 8 A block diagram 800 of a communication manager 805 supporting spatial reuse for lateral link communication according to various aspects of this disclosure is shown. The communication manager 805 may be an example of aspects of the communication manager 615, communication manager 715, or communication manager 910 described herein. The communication manager 805 may include a lateral link control receiver 810, a lateral link control decoder 815, a reserved resource manager 820, a distance component 825, a reference signal receiver 830, a lateral link communication manager 835, a sub-channel component 840, a lateral link control transmitter 845, and a lateral link control monitor 850. Each of these modules may communicate directly or indirectly with each other (e.g., via one or more buses).

[0140] The sidelink control receiver 810 can receive a first sidelink control channel from the second UE, which indicates a set of reserved resources for sidelink communication associated with the second UE.

[0141] In some examples, the sidelink control receiver 810 may receive a first sidelink control channel from the second UE that indicates a set of reserved resources for sidelink communication associated with the second UE.

[0142] In some examples, the sidelink control receiver 810 may receive one or more additional sidelink control channels, each additional sidelink control channel indicating a corresponding set of reserved resources for sidelink communication.

[0143] In some examples, the side link control receiver 810 can receive an indication of the sub-channel index of the first side link control channel within a field of the first side link control channel.

[0144] In some examples, the sidelink control receiver 810 may receive one or more additional sidelink control channels, each additional sidelink control channel indicating a corresponding set of reserved resources for sidelink communication.

[0145] In some examples, the side link control receiver 810 can receive an indication of the sub-channel index of the first side link control channel within a field of the first side link control channel.

[0146] The sidelink control decoder 815 can decode the second sidelink control channel from the second UE based on the first sidelink control channel.

[0147] In some examples, the side link control decoder 815 can determine that the decoding of the second side link control channel was successful.

[0148] In some examples, the sidelink control decoder 815 can identify the MCS, beta offset, control format, or any combination thereof associated with the second sidelink control channel based on the decoding of the first sidelink control channel.

[0149] The reserved resource manager 820 can determine the set of reserved resources available for use by the first UE based on the decoding of the second-side cross-link control channel, the radius of the second-side cross-link control channel, and the distance between the first UE and the second UE.

[0150] In some examples, the reserved resource manager 820 may determine that a set of reserved resources is available for use by the first UE based on monitoring of the second-side cross-link control channel, wherein the set of reserved resources is determined to be available based on unsuccessful decoding of the second-side cross-link control channel.

[0151] In some examples, the reserved resource manager 820 can determine a subset of reserved resources available for use by the first UE, the subset of reserved resources being derived from the corresponding set of reserved resources and the set of reserved resources.

[0152] In some examples, the reservation resource manager 820 can determine a subset of reserved resources based on the corresponding transmit power used for one or more additional side link control channels.

[0153] In some examples, the reservation resource manager 820 can determine a subset of reserved resources based on the corresponding distance associated with one or more additional side link control channels.

[0154] In some examples, the reserved resource manager 820 can determine a subset of reserved resources available for use by the first UE, the subset of reserved resources being derived from the corresponding set of reserved resources and the set of reserved resources.

[0155] In some examples, the reservation resource manager 820 can determine a subset of reserved resources based on the corresponding transmit power used for one or more additional side link control channels.

[0156] The side link control monitor 850 can monitor the second side link control channel from the second UE based on the first side link control channel.

[0157] The distance component 825 can determine the radius of the second-side cross-link control channel based on the successful decoding of the second-side cross-link control channel, wherein the reserved resource set is determined to be available based on a first distance corresponding to the difference between the distance between the first UE and the second UE and the radius of the second-side cross-link control channel exceeding a threshold distance.

[0158] In some examples, the distance component 825 may determine the threshold distance based on a second distance between the second UE and the target UE associated with the first side link control channel, and the path loss between the first UE and the second UE.

[0159] In some examples, the distance component 825 may determine the second distance between the second UE and the target UE based on the MCS, beta offset, control format, or any combination thereof associated with the second side link control channel.

[0160] In some examples, the distance component 825 may determine the threshold distance based on an alpha factor corresponding to the path loss exponent, SINR target, spatial transmission type, or any combination thereof.

[0161] In some examples, the distance component 825 may determine the corresponding distance for one or more additional side link control channels based on the corresponding successful decoding process for one or more additional side link control channels.

[0162] The reference signal receiver 830 can receive a reference signal using a first side link control channel, a second side link control channel, or a side link data channel, or any combination thereof, wherein the path loss between the first UE and the second UE is determined based on power measurements associated with the reference signal.

[0163] In some cases, power measurement is RSRP, RSSI, or a combination thereof.

[0164] The sidelink communication manager 835 can use a subset of reserved resources to communicate with the target UE.

[0165] In some examples, the sidelink communication manager 835 can communicate with the target UE via a reserved resource set based on determining that a reserved resource set is available for use by the first UE.

[0166] In some examples, the sidelink communication manager 835 may determine the transmit power for communicating with the target UE using a reserved resource set based on the radius of the second sidelink control channel and the distance between the first UE and the second UE. In some examples, the sidelink communication manager 835 may determine the transmit power for communicating with the target UE using a subset of reserved resources based on unsuccessful decoding of the second sidelink control channel.

[0167] Subchannel component 840 can select from the set of subchannels a subchannel for sidelink communication with the target UE via a reserved resource set, wherein the subchannel is different from the subchannel used for the first sidelink control channel.

[0168] In some examples, the subchannel component 840 can select from the subchannel set a subchannel for sidelink communication with the target UE via a reserved resource set, wherein the subchannel is associated with an index different from the subchannel index.

[0169] In some examples, subchannel component 840 can identify subchannels associated with the first-side link control channel.

[0170] The side-link control transmitter 845 can use a sub-channel to transmit the third side-link control channel based on priority, DMRS mode, and subsequent control channel format, since the third side-link control channel and subsequent control channel are the same. The third side-link control channel indicates the set of reserved resources available for use by the first UE.

[0171] In some examples, the side link control transmitter 845 can use a sub-channel to transmit the third side link control channel based on the priority, DMRS mode, and subsequent control channel format being the same for the third side link control channel and the subsequent control channel. The third side link control channel indicates a set of reserved resources available for use by the first UE.

[0172] Figure 9 A diagram of a system 900 including device 905 supporting space reuse for lateral link communication is shown according to various aspects of this disclosure. Device 905 may be an example of device 605, device 705, or UE 115 as described herein, or a component including device 605, device 705, or UE 115. Device 905 may include components for bidirectional voice and data communication, including components for transmitting and receiving communications, including a communication manager 910, an I / O controller 915, a transceiver 920, an antenna 925, a memory 930, and a processor 940. These components may communicate electronically via one or more buses (e.g., bus 945).

[0173] The communication manager 910 can perform the following operations: receive from the second UE a first sidelink control channel indicating a set of reserved resources for sidelink communication associated with the second UE; decode a second sidelink control channel from the second UE based on the first sidelink control channel; and determine that the set of reserved resources is available for use by the first UE based on the decoding of the second sidelink control channel, the radius of the second sidelink control channel, and the distance between the first UE and the second UE. The communication manager 910 can also perform the following operations: receive from the second UE a first sidelink control channel indicating a set of reserved resources for sidelink communication associated with the second UE; monitor the second sidelink control channel from the second UE based on the first sidelink control channel; and determine that the set of reserved resources is available for use by the first UE based on the monitoring of the second sidelink control channel, wherein the set of reserved resources is determined to be available based on unsuccessful decoding of the second sidelink control channel.

[0174] The I / O controller 915 can manage input and output signals for device 905. The I / O controller 915 can also manage peripheral devices not integrated into device 905. In some cases, the I / O controller 915 can represent a physical connection or port to an external peripheral device. In some cases, the I / O controller 915 can utilize, for example... This can be an operating system such as a modem, keyboard, mouse, touchscreen, or similar device, or an interface with such devices. In some cases, the I / O controller 915 may be implemented as part of a processor. In some cases, a user may interact with the device 905 via the I / O controller 915 or via hardware components controlled by the I / O controller 915.

[0175] Transceiver 920 can communicate bidirectionally via one or more antennas, wired or wireless links as described above. For example, transceiver 920 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. Transceiver 920 may also include a modem for modulating packets and providing the modulated packets to the antenna for transmission, and for demodulating packets received from the antenna.

[0176] In some cases, a wireless device may include a single antenna 925. However, in other cases, the device may have more than one antenna 925, which are capable of transmitting or receiving multiple wireless transmissions simultaneously.

[0177] Memory 930 may include random access memory (RAM) and read-only memory (ROM). Memory 930 may store computer-readable, computer-executable code 935, which includes instructions that, when executed, cause the processor to perform the various functions described herein. In some cases, in addition to this, memory 930 may also contain a basic I / O system (BIOS) that controls basic hardware or software operations, such as interaction with peripheral components or devices.

[0178] Processor 940 may include intelligent hardware devices (e.g., general-purpose processors, DSPs, CPUs, microcontrollers, ASICs, FPGAs, programmable logic devices, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some cases, processor 940 may be configured to use a memory controller to operate a memory array. In other cases, the memory controller may be integrated into processor 940. Processor 940 may be configured to execute computer-readable instructions stored in memory (e.g., memory 930) to cause device 905 to perform various functions (e.g., functions or tasks supporting space reuse for sidelink communication).

[0179] Code 935 may include instructions for implementing various aspects of this disclosure, including instructions for supporting wireless communication. Code 935 may be stored in a non-transitory computer-readable medium (e.g., system memory or other types of memory). In some cases, code 935 may not be directly executable by processor 940, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0180] Figure 10 A flowchart illustrating a method 1000 for supporting spatial reuse for sidelink communication according to various aspects of this disclosure is shown. Operation of method 1000 can be implemented by a UE 115 or its components as described herein. For example, operation of method 1000 can be implemented by, as referred to... Figures 6 to 9 The communication manager described below is used for execution. In some examples, the UE can execute a set of instructions to control the UE's functional units to perform the functions described below. Alternatively, the UE can use dedicated hardware to perform aspects of the functions described below.

[0181] At point 1005, the UE can receive from the second UE a first sidelink control channel indicating a set of reserved resources for sidelink communication associated with the second UE. Operation at point 1005 can be performed according to the method described herein. In some examples, aspects of the operation at point 1005 can be determined by reference to... Figures 6 to 9 The described side link control receiver is used to perform this.

[0182] At point 1010, the UE can decode the second-side cross-link control channel from the second UE based on the first-side cross-link control channel. The operation at point 1010 can be performed according to the method described herein. In some examples, aspects of the operation at point 1010 can be derived as described in reference... Figures 6 to 9 The described side link control decoder is used to perform this.

[0183] At point 1015, the UE can determine the set of reserved resources available for use by the first UE based on the decoding of the second-side cross-link control channel, the radius of the second-side cross-link control channel, and the distance between the first UE and the second UE. The operation at point 1015 can be performed according to the method described herein. In some examples, aspects of the operation at point 1015 can be determined as described in reference... Figures 6 to 9 The described reserved resource manager is used for execution.

[0184] Figure 11 A flowchart illustrating a method 1100 for supporting spatial reuse for sidelink communication according to various aspects of this disclosure is shown. Operation of method 1100 can be implemented by a UE 115 or its components as described herein. For example, operation of method 1100 can be implemented by, as referred to... Figures 6 to 9The communication manager described below is used for execution. In some examples, the UE can execute a set of instructions to control the UE's functional units to perform the functions described below. Alternatively, the UE can use dedicated hardware to perform aspects of the functions described below.

[0185] At 1105, the UE can receive from the second UE a first sidelink control channel indicating a set of reserved resources for sidelink communication associated with the second UE. Operation at 1105 can be performed according to the method described herein. In some examples, aspects of the operation at 1105 can be determined by reference to... Figures 6 to 9 The described side link control receiver is used to perform this.

[0186] At 1110, the UE can decode the second-side cross-link control channel from the second UE based on the first-side cross-link control channel. The operation at 1110 can be performed according to the method described herein. In some examples, aspects of the operation at 1110 can be derived as described in reference... Figures 6 to 9 The described side link control decoder is used to perform this.

[0187] At step 1115, the UE can confirm successful decoding of the second-side link control channel. The operation at step 1115 can be performed according to the method described herein. In some examples, aspects of the operation at step 1115 can be determined by referring to... Figures 6 to 9 The described side link control decoder is used to perform this.

[0188] At 1120, the UE can determine the radius of the second-side cross-link control channel and the distance between the first UE and the second UE based on the successful decoding of the second-side cross-link control channel. The reserved resource set is determined to be available based on a first distance corresponding to the difference between the distance between the first UE and the second UE and the radius of the second-side cross-link control channel exceeding a threshold distance. Operation 1120 can be performed according to the method described herein. In some examples, aspects of the operation of 1120 can be determined as described in reference... Figures 6 to 9 The distance component is described and executed.

[0189] At point 1125, the UE can determine the set of reserved resources available for use by the first UE based on the decoding of the second-side walkway control channel and the first distance. The operation at point 1125 can be performed according to the method described herein. In some examples, aspects of the operation at point 1125 can be determined as described in reference... Figures 6 to 9 The described reserved resource manager is used for execution.

[0190] Figure 12A flowchart illustrating a method 1200 for supporting spatial reuse for sidelink communication according to various aspects of this disclosure is shown. Operation of method 1200 can be implemented by a UE 115 or its components as described herein. For example, operation of method 1200 can be implemented by, as referred to... Figures 6 to 9 The communication manager described below is used for execution. In some examples, the UE can execute a set of instructions to control the UE's functional units to perform the functions described below. Alternatively, the UE can use dedicated hardware to perform aspects of the functions described below.

[0191] At point 1205, the UE can receive from the second UE a first sidelink control channel indicating a set of reserved resources for sidelink communication associated with the second UE. Operation at point 1205 can be performed according to the method described herein. In some examples, aspects of operation at point 1205 can be determined by reference to... Figures 6 to 9 The described side link control receiver is used to perform this.

[0192] At point 1210, the UE can decode the second-side cross-link control channel from the second UE based on the first-side cross-link control channel. The operation at point 1210 can be performed according to the method described herein. In some examples, aspects of the operation at point 1210 can be derived as described in reference... Figures 6 to 9 The described side link control decoder is used to perform this.

[0193] At step 1215, the UE can confirm successful decoding of the second-side link control channel. The operation at step 1215 can be performed according to the method described herein. In some examples, aspects of the operation at step 1215 can be determined by referring to... Figures 6 to 9 The described side link control decoder is used to perform this.

[0194] At 1220, the UE can determine the radius of the second-side cross-link control channel based on the successful decoding of the second-side cross-link control channel, wherein the reserved resource set is determined to be available based on a first distance corresponding to the difference between the distance between the first UE and the second UE and the radius of the second-side cross-link control channel exceeding a threshold distance. The operation at 1220 can be performed according to the method described herein. In some examples, aspects of the operation at 1220 can be determined as described in reference... Figures 6 to 9 The distance component is described and executed.

[0195] At 1225, the UE can determine the threshold distance based on the second distance between the second UE and the target UE associated with the first side crosslink control channel, and the path loss between the first UE and the second UE. The operation at 1225 can be performed according to the method described herein. In some examples, aspects of the operation at 1225 can be determined as referenced... Figures 6 to 9The distance component is described and executed.

[0196] At point 1230, the UE can determine the set of reserved resources available for use by the first UE based on the decoding of the second-side link control channel and the first distance. The operation at point 1230 can be performed according to the method described herein. In some examples, aspects of the operation at point 1230 can be determined by referring to... Figures 6 to 9 The described reserved resource manager is used for execution.

[0197] Figure 13 A flowchart illustrating a method 1300 for supporting spatial reuse for sidelink communication according to various aspects of this disclosure is shown. Operation of method 1300 can be implemented by a UE 115 or its components as described herein. For example, operation of method 1300 can be implemented by, as referred to... Figures 6 to 9 The communication manager described below is used for execution. In some examples, the UE can execute a set of instructions to control the UE's functional units to perform the functions described below. Alternatively, the UE can use dedicated hardware to perform aspects of the functions described below.

[0198] At 1305, the UE can receive from the second UE a first sidelink control channel indicating a set of reserved resources for sidelink communication associated with the second UE. Operation at 1305 can be performed according to the method described herein. In some examples, aspects of the operation at 1305 can be determined by reference to... Figures 6 to 9 The described side link control receiver is used to perform this.

[0199] At 1310, the UE can decode the second-side cross-link control channel from the second UE based on the first-side cross-link control channel. The operation at 1310 can be performed according to the method described herein. In some examples, aspects of the operation at 1310 can be derived as described in reference... Figures 6 to 9 The described side link control decoder is used to perform this.

[0200] At point 1315, the UE can determine the set of reserved resources available for use by the first UE based on the decoding of the second-side cross-link control channel, the radius of the second-side cross-link control channel, and the distance between the first UE and the second UE. The operation at point 1315 can be performed according to the method described herein. In some examples, aspects of the operation at point 1315 can be determined by referring to... Figures 6 to 9 The described reserved resource manager is used for execution.

[0201] At 1320, the UE can select from the set of subchannels a subchannel for sidelink communication with the target UE via a reserved resource set, wherein the subchannel is different from the subchannel used for the first sidelink control channel. The operation at 1320 can be performed according to the method described herein. In some examples, aspects of the operation at 1320 can be derived from, as referenced... Figures 6 to 9 The described sub-channel components are used to execute this.

[0202] Figure 14 A flowchart illustrating a method 1400 for supporting spatial reuse for sidelink communication according to various aspects of this disclosure is shown. Operation of method 1400 can be implemented by a UE 115 or its components as described herein. For example, operation of method 1400 can be implemented by, as referred to... Figures 6 to 9 The communication manager described below is used for execution. In some examples, the UE can execute a set of instructions to control the UE's functional units to perform the functions described below. Alternatively, the UE can use dedicated hardware to perform aspects of the functions described below.

[0203] At 1405, the UE can receive from the second UE a first sidelink control channel indicating a set of reserved resources for sidelink communication associated with the second UE. Operation at 1405 can be performed according to the method described herein. In some examples, aspects of the operation at 1405 can be determined by reference to... Figures 6 to 9 The described side link control receiver is used to perform this.

[0204] At point 1410, the UE can monitor the second-side cross-link control channel from the second UE based on the first-side cross-link control channel. The operation at point 1410 can be performed according to the method described herein. In some examples, aspects of the operation at point 1410 can be determined by referring to... Figures 6 to 9 The described side link control monitor is used to perform this.

[0205] At point 1415, the UE can determine whether a set of reserved resources is available for use by the first UE based on monitoring of the second-side walkway control channel, wherein the set of reserved resources is determined to be available based on unsuccessful decoding of the second-side walkway control channel. The operation at point 1415 can be performed according to the method described herein. In some examples, aspects of the operation at point 1415 can be determined by referring to... Figures 6 to 9 The described reserved resource manager is used for execution.

[0206] Figure 15 A flowchart illustrating a method 1500 for supporting spatial reuse for sidelink communication according to various aspects of this disclosure is shown. Operation of method 1500 can be implemented by a UE 115 or its components as described herein. For example, operation of method 1500 can be implemented by, as referred to... Figures 6 to 9 The communication manager described below is used for execution. In some examples, the UE can execute a set of instructions to control the UE's functional units to perform the functions described below. Alternatively, the UE can use dedicated hardware to perform aspects of the functions described below.

[0207] At point 1505, the UE can receive from the second UE a first sidelink control channel indicating a set of reserved resources for sidelink communication associated with the second UE. Operation at point 1505 can be performed according to the method described herein. In some examples, aspects of operation at point 1505 can be determined by reference to... Figures 6 to 9 The described side link control receiver is used to perform this.

[0208] At point 1510, the UE can monitor the second-side cross-link control channel from the second UE based on the first-side cross-link control channel. The operation at point 1510 can be performed according to the method described herein. In some examples, aspects of the operation at point 1510 can be determined by referring to... Figures 6 to 9 The described side link control monitor is used to perform this.

[0209] At 1515, the UE may receive one or more additional sidelink control channels, each indicating a corresponding set of reserved resources for sidelink communication. Operation of 1515 can be performed according to the methods described herein. In some examples, aspects of the operation of 1515 may be determined by reference to... Figures 6 to 9 The described side link control receiver is used to perform this.

[0210] At point 1520, the UE can determine whether a set of reserved resources is available for use by the first UE based on monitoring of the second-side walkway control channel, wherein the set of reserved resources is determined to be available based on unsuccessful decoding of the second-side walkway control channel. The operation at point 1520 can be performed according to the method described herein. In some examples, aspects of the operation at point 1520 can be determined by referring to... Figures 6 to 9 The described reserved resource manager is used for execution.

[0211] At point 1525, the UE can determine a subset of reserved resources available for use by the first UE. This subset of reserved resources is derived from the corresponding set of reserved resources and the set of reserved resources. The operation at point 1525 can be performed according to the method described herein. In some examples, aspects of the operation at point 1525 can be derived from, as referenced... Figures 6 to 9 The described reserved resource manager is used for execution.

[0212] At point 1530, the UE can use a subset of reserved resources to communicate with the target UE. The operation at point 1530 can be performed according to the method described herein. In some examples, aspects of the operation at point 1530 can be derived from, as referenced... Figures 6 to 9 The described side link communication manager is used to perform this.

[0213] Figure 16 A flowchart illustrating a method 1600 for supporting spatial reuse for sidelink communication according to various aspects of this disclosure is shown. Operation of method 1600 can be implemented by a UE 115 or its components as described herein. For example, operation of method 1600 can be implemented by, as referred to... Figures 6 to 9 The communication manager described below is used for execution. In some examples, the UE can execute a set of instructions to control the UE's functional units to perform the functions described below. Alternatively, the UE can use dedicated hardware to perform aspects of the functions described below.

[0214] At 1605, the UE can receive from the second UE a first sidelink control channel indicating a set of reserved resources for sidelink communication associated with the second UE. Operation at 1605 can be performed according to the method described herein. In some examples, aspects of the operation at 1605 can be determined by reference to... Figures 6 to 9 The described side link control receiver is used to perform this.

[0215] At point 1610, the UE can monitor the second-side cross-link control channel from the second UE based on the first-side cross-link control channel. The operation at point 1610 can be performed according to the method described herein. In some examples, aspects of the operation at point 1610 can be derived as described in reference... Figures 6 to 9 The described side link control monitor is used to perform this.

[0216] At point 1615, the UE can determine whether a set of reserved resources is available for use by the first UE based on monitoring of the second-side walkway control channel, wherein the set of reserved resources is determined to be available based on unsuccessful decoding of the second-side walkway control channel. The operation at point 1615 can be performed according to the method described herein. In some examples, aspects of the operation at point 1615 can be determined by referring to... Figures 6 to 9 The described reserved resource manager is used for execution.

[0217] At 1620, the UE can determine the sub-channel associated with the first-side walkway control channel. The operation at 1620 can be performed according to the method described herein. In some examples, aspects of the operation at 1620 can be determined by referring to... Figures 6 to 9 The described sub-channel components are used to execute this.

[0218] At point 1625, the UE can use a sub-channel to transmit the third-side traversal control channel based on priority, demodulation reference signal mode, and subsequent control channel format, which are identical for both the third-side traversal control channel and subsequent control channels. The third-side traversal control channel indicates a set of reserved resources available for use by the first UE. Operation 1625 can be performed according to the method described herein. In some examples, aspects of operation 1625 can be determined by reference to... Figures 6 to 9 The described side link control transmitter is used to perform this.

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

[0220] The following provides a summary of various aspects of this disclosure:

[0221] Aspect 1: A method for wireless communication at a first UE, comprising: receiving from a second UE a first sidelink control channel indicating a set of reserved resources for sidelink communication associated with the second UE; decoding a second sidelink control channel from the second UE based at least in part on the first sidelink control channel; and determining, at least in part on the decoding of the second sidelink control channel, the radius of the second sidelink control channel, and the distance between the first UE and the second UE, that the set of reserved resources is available for use by the first UE.

[0222] Aspect 2: The method according to aspect 1 further includes: determining that the decoding of the second side link control channel is successful; and determining the radius of the second side link control channel based at least in part on the determination that the decoding of the second side link control channel is successful, wherein the reserved resource set is determined to be available based at least in part on a first distance corresponding to the difference between the distance between the first UE and the second UE and the radius of the second side link control channel exceeding a threshold distance.

[0223] Aspect 3: The method according to aspect 2 further includes: determining the threshold distance based at least in part on a second distance between the second UE and the target UE associated with the first side link control channel and the path loss between the first UE and the second UE.

[0224] Aspect 4: The method according to aspect 3 further includes: identifying, at least in part, an MCS, beta offset, control format, or any combination thereof associated with the second side crosslink control channel based on the decoding of the first side crosslink control channel; and determining, at least in part, the second distance between the second UE and the target UE based on the MCS, the beta offset, the control format, or any combination thereof associated with the second side crosslink control channel.

[0225] Aspect 5: The method according to any one of Aspects 3 to 4 further includes: receiving a reference signal using the first side link control channel, the second side link control channel, or the side link data channel, or any combination thereof, wherein the path loss between the first UE and the second UE is determined at least in part based on power measurements associated with the reference signal.

[0226] Aspect 6: The method according to aspect 5, wherein the power measurement is RSRP, RSSI, or a combination thereof.

[0227] Aspect 7: The method according to any one of Aspects 2 to 6 further includes: determining the threshold distance based at least in part on an alpha factor corresponding to the path loss exponent, the SINR target, the spatial transmission type, or any combination thereof.

[0228] Aspect 8: The method according to any one of Aspects 1 to 7 further includes: determining, at least in part, the transmit power for communicating with the target UE using the reserved resource set based on the radius of the second side link control channel and the distance between the first UE and the second UE.

[0229] Aspect 9: The method according to any one of Aspects 1 to 8 further includes: receiving one or more additional sidelink control channels, each additional sidelink control channel indicating a corresponding set of reserved resources for sidelink communication; determining a subset of reserved resources available for use by the first UE, the subset of reserved resources being derived from the corresponding set of reserved resources and the set of reserved resources; and using the subset of reserved resources to communicate with the target UE.

[0230] Aspect 10: The method according to aspect 9 further includes: determining the reserved resource subset based at least in part on the corresponding transmit power for the one or more additional side link control channels.

[0231] Aspect 11: The method according to aspect 9 further includes: determining a corresponding distance for the one or more additional side link control channels based at least in part on a corresponding successful decoding process for the one or more additional side link control channels; and determining the reserved resource subset based at least in part on the corresponding distance associated with the one or more additional side link control channels.

[0232] Aspect 12: The method according to any one of Aspects 1 to 11 further includes: selecting from the set of sub-channels a sub-channel for sidelink communication with the target UE via the set of reserved resources, wherein the sub-channel is different from the sub-channel used for the first sidelink control channel.

[0233] Aspect 13: The method according to any one of Aspects 1 to 11 further includes: receiving an indication of a sub-channel index of the first sidelink control channel within a field of the first sidelink control channel; and selecting from the set of sub-channels a sub-channel for sidelink communication with the target UE via the set of reserved resources, wherein the sub-channel is associated with an index different from the sub-channel index.

[0234] Aspect 14: The method according to any one of Aspects 1 to 11 further includes: determining a sub-channel associated with the first side link control channel; and transmitting the third side link control channel using the sub-channel based at least in part on the fact that priority, DMRS mode, and subsequent control channel format are the same for the third side link control channel and the subsequent control channel, the third side link control channel indicating the set of reserved resources available for use by the first UE.

[0235] Aspect 15: The method according to any one of Aspects 1 to 14 further includes: at least in part based on determining that the reserved resource set is available for use by the first UE to communicate with the target UE via the reserved resource set.

[0236] Aspect 16: A method for wireless communication at a first UE, comprising: receiving from a second UE a first sidelink control channel indicating a set of reserved resources for sidelink communication associated with the second UE; monitoring a second sidelink control channel from the second UE based at least in part on the first sidelink control channel; and determining, at least in part on the monitoring of the second sidelink control channel, that the set of reserved resources is available for use by the first UE, wherein the set of reserved resources is determined to be available based at least in part on unsuccessful decoding of the second sidelink control channel.

[0237] Aspect 17: The method according to aspect 16 further includes: receiving one or more additional sidelink control channels, each additional sidelink control channel indicating a corresponding set of reserved resources for sidelink communication; determining a subset of reserved resources available for use by the first UE, the subset of reserved resources being derived from the corresponding set of reserved resources and the set of reserved resources; and using the subset of reserved resources to communicate with the target UE.

[0238] Aspect 18: The method according to aspect 17 further includes: determining the reserved resource subset based at least in part on the corresponding transmit power for the one or more additional side link control channels.

[0239] Aspect 19: The method according to any one of Aspects 16 to 18 further includes: selecting from a set of sub-channels a sub-channel for sidelink communication with a target UE via the set of reserved resources, wherein the sub-channel is different from the sub-channel used for the first sidelink control channel.

[0240] Aspect 20: The method according to any one of Aspects 16 to 18 further includes: receiving an indication of a sub-channel index of the first sidelink control channel within a field of the first sidelink control channel; and selecting from a set of sub-channels a sub-channel for sidelink communication with the target UE via the set of reserved resources, wherein the sub-channel is associated with an index different from the sub-channel index.

[0241] Aspect 21: The method according to any one of Aspects 16 to 18 further includes: determining a sub-channel associated with the first side link control channel; and transmitting the third side link control channel using the sub-channel based at least in part on the fact that priority, DMRS mode, and subsequent control channel format are the same for the third side link control channel and the subsequent control channel, the third side link control channel indicating the set of reserved resources available for use by the first UE.

[0242] Aspect 22: The method according to any one of Aspects 16 to 21 further includes: at least in part based on determining that the reserved resource set is available for use by the first UE to communicate with the target UE via the reserved resource set.

[0243] Aspect 23: The method according to any one of aspects 16 to 22 further includes: determining, at least in part, the transmit power for communicating with the target UE via the reserved resource set based on the unsuccessful decoding of the second side link control channel.

[0244] Aspect 24: An apparatus for wireless communication at a first UE, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method according to any one of aspects 1 to 15.

[0245] Aspect 25: An apparatus for wireless communication at a first UE, comprising at least one unit for performing the method according to any one of aspects 1 to 15.

[0246] Aspect 26: A non-transitory computer-readable medium storing code for wireless communication at a first UE, the code comprising instructions executable by a processor to perform the method according to any one of aspects 1 to 15.

[0247] Aspect 27: An apparatus for wireless communication at a first UE, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method according to any one of aspects 16 to 23.

[0248] Aspect 28: An apparatus for wireless communication at a first UE, comprising at least one unit for performing the method according to any one of aspects 16 to 23.

[0249] Aspect 29: A non-transitory computer-readable medium storing code for wireless communication at a first UE, the code comprising instructions executable by a processor to perform the method according to any one of aspects 16 to 23.

[0250] While aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for illustrative purposes, and the terms LTE, LTE-A, LTE-A Pro, or NR may be used extensively in the description, the techniques described herein apply beyond LTE, LTE-A, LTE-A Pro, or NR networks. For example, the techniques described can be applied to a variety of other wireless communication systems, such as Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, and other systems and radio technologies not explicitly mentioned herein.

[0251] The information and signals described herein can be represented using any of a variety of different techniques and methods. For example, the data, instructions, commands, information, signals, bits, symbols, and chips mentioned throughout the description may be represented by voltage, current, electromagnetic waves, magnetic fields or particles, light fields or particles, or any combination thereof.

[0252] The various illustrative blocks and components described herein can 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 component, or any combination thereof designed to perform the functions described herein. The general-purpose processor may be a microprocessor, but alternatively, 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 digital signal processor (DSP) and a microprocessor, multiple microprocessors, one or more microprocessors combined with a DSP core, or any other such configuration).

[0253] The functions described herein can be implemented using hardware, software executed by a processor, firmware, or any combination thereof. If implemented using software executed by a processor, the functions can be stored as one or more instructions or code on or transmitted through a computer-readable medium. Other examples and implementations are within the scope of this disclosure and the appended claims. For example, due to the nature of software, the functions described herein can be implemented using software executed by a processor, hardware, firmware, hardwiring, or any combination of these. Features implementing the functions can also be physically located in various locations, including being distributed such that different parts of the functions are implemented in different physical locations.

[0254] Computer-readable media includes both non-transitory computer storage media and communication media, with communication media encompassing any medium that facilitates the transfer of computer programs from one place to another. Non-transitory storage media can be any available medium accessible by a general-purpose computer or a special-purpose computer. By way of example, and not limitation, non-transitory computer-readable media can include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, compressed optical disc (CD) ROM or other optical disc storage, disk storage or other magnetic storage devices, or any other non-transitory medium that can be used to carry or store desired units of program code in the form of instructions or data structures, and accessible by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Furthermore, any connection is appropriately referred to as computer-readable media. For example, if software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included within the definition of computer-readable media. As used herein, disks and optical discs include CDs, laser discs, optical discs, digital multifunction discs (DVDs), floppy disks, and Blu-ray discs, wherein disks typically copy data magnetically, while optical discs use lasers to copy data optically. The combinations described above are also included within the scope of computer-readable media.

[0255] As used herein (including in the claims), the word "or" in a list of items (e.g., a list of items ending with a phrase such as "at least one of" or "one or more of") indicates an inclusive list, such that 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). Furthermore, as used herein, the phrase "based on" should not be construed as a reference to a closed set of conditions. For example, an example step described as "based on condition A" could be based on both condition A and condition B without departing from the scope of this disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same way as the phrase "at least partially based on".

[0256] In the accompanying drawings, similar components or features may have the same reference numerals. Furthermore, various components of the same type can be distinguished by a dash and a second reference numeral following the reference numeral, used to differentiate between similar components. If only the first reference numeral is used in the specification, the description applies to any one of the similar components having the same first reference numeral, without regard to the second reference numeral or other subsequent reference numerals.

[0257] This document describes exemplary configurations in conjunction with the accompanying drawings, and does not represent all examples that can be implemented or that are within the scope of the claims. The term "example" as used herein means "serving as an example, instance, or illustration," and not "preferred" or "advantageous over other examples." The detailed description includes specific details for the purpose of providing an understanding of the described techniques. However, these techniques can be implemented without these specific details. In some cases, known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described examples.

[0258] The description herein is provided to enable those skilled in the art to implement or use the present disclosure. Various modifications to the present disclosure will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other variations without departing from the scope of the disclosure. Therefore, the present disclosure is not limited to the examples and designs described herein, but is to be given the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication at a first user equipment (UE), comprising: Receive a first sidelink control channel from the second UE indicating a set of reserved resources for sidelink communication associated with the second UE; The second side cross-link control channel from the second UE is decoded at least in part based on the first side cross-link control channel; as well as The reserved resource set is determined to be available for use by the first UE based at least in part on the decoding of the second side crosslink control channel, the radius of the second side crosslink control channel, and the distance between the first UE and the second UE.

2. The method according to claim 1, further comprising: The decoding of the second-side link control channel was confirmed to be successful; as well as The radius of the second-side cross-link control channel is determined at least in part based on the successful decoding of the second-side cross-link control channel, wherein the reserved resource set is determined to be available at least in part based on a first distance corresponding to the difference between the distance between the first UE and the second UE and the radius of the second-side cross-link control channel exceeding a threshold distance.

3. The method according to claim 2, further comprising: The threshold distance is determined at least in part based on a second distance between the second UE and the target UE associated with the first side link control channel, and the path loss between the first UE and the second UE.

4. The method according to claim 3, further comprising: The modulation and coding scheme (MCS), beta offset, control format, or any combination thereof associated with the second side cross-link control channel is identified, at least in part, based on the decoding of the first side cross-link control channel. as well as The second distance between the second UE and the target UE is determined at least in part based on the MCS associated with the second side link control channel, the beta offset, the control format, or any combination thereof.

5. The method according to claim 3, further comprising: A reference signal is received using the first side link control channel, the second side link control channel, or the side link data channel, or any combination thereof, wherein the path loss between the first UE and the second UE is determined at least in part based on power measurements associated with the reference signal.

6. The method according to claim 5, wherein, The power measurement is the Reference Signal Received Power (RSRP), the Reference Signal Strength Indicator (RSSI), or a combination thereof.

7. The method according to claim 2, further comprising: The threshold distance is determined at least in part based on an alpha factor corresponding to the path loss exponent, the signal-to-interference-plus-noise ratio (SINR) target, the spatial transmission type, or any combination thereof.

8. The method according to claim 1, further comprising: The transmit power for communicating with the target UE using the reserved resource set is determined at least in part based on the radius of the second side link control channel and the distance between the first UE and the second UE.

9. The method according to claim 1, further comprising: Receive one or more additional sidelink control channels, each additional sidelink control channel indicating a corresponding set of reserved resources for sidelink communication; A subset of reserved resources that can be used by the first UE is determined, the subset of reserved resources being derived from the corresponding set of reserved resources and the set of reserved resources; as well as Use the reserved resource subset to communicate with the target UE.

10. The method of claim 9, further comprising: The reserved resource subset is determined at least in part based on the corresponding transmit power for the one or more additional sidelink control channels.

11. The method of claim 9, further comprising: The corresponding distance for the one or more additional side link control channels is determined at least in part based on the corresponding successful decoding process for the one or more additional side link control channels; as well as The reserved resource subset is determined at least in part based on the corresponding distances associated with the one or more additional sidelink control channels.

12. The method according to claim 1, further comprising: Select a subchannel from the subchannel set for sidelink communication with the target UE via the reserved resource set, wherein the subchannel is different from the subchannel used for the first sidelink control channel.

13. The method according to claim 1, further comprising: Receive an indication of the sub-channel index of the first-side cross-link control channel within the field of the first-side cross-link control channel; as well as Select a subchannel from the subchannel set for sidelink communication with the target UE via the reserved resource set, wherein the subchannel is associated with an index different from the subchannel index.

14. The method according to claim 1, further comprising: Determine the sub-channel associated with the first-side crosslink control channel; as well as The third-side hop control channel is transmitted using the sub-channel based at least in part on the fact that the priority, demodulation reference signal mode, and subsequent control channel format are the same for the third-side hop control channel and the subsequent control channel. The third-side hop control channel indicates the set of reserved resources that can be used by the first UE.

15. The method according to claim 1, further comprising: At least in part, this is based on the determination that the reserved resource set is available for use by the first UE to communicate with the target UE via the reserved resource set.

16. A method for wireless communication at a first user equipment (UE), comprising: Receive a first sidelink control channel from the second UE indicating a set of reserved resources for sidelink communication associated with the second UE; The second side cross-link control channel from the second UE is monitored at least in part based on the first side cross-link control channel; as well as The reserved resource set is determined to be available for use by the first UE based at least in part on the monitoring of the second-side cross-link control channel, wherein the reserved resource set is determined to be available based at least in part on the unsuccessful decoding of the second-side cross-link control channel.

17. The method of claim 16, further comprising: Receive one or more additional sidelink control channels, each additional sidelink control channel indicating a corresponding set of reserved resources for sidelink communication; A subset of reserved resources that can be used by the first UE is determined, the subset of reserved resources being derived from the corresponding set of reserved resources and the set of reserved resources; as well as Use the reserved resource subset to communicate with the target UE.

18. The method of claim 17, further comprising: The reserved resource subset is determined at least in part based on the corresponding transmit power for the one or more additional sidelink control channels.

19. The method of claim 16, further comprising: Select a subchannel from the subchannel set for sidelink communication with the target UE via the reserved resource set, wherein the subchannel is different from the subchannel used for the first sidelink control channel.

20. The method of claim 16, further comprising: Receive an indication of the sub-channel index of the first-side cross-link control channel within the field of the first-side cross-link control channel; as well as Select a subchannel from the subchannel set for sidelink communication with the target UE via the reserved resource set, wherein the subchannel is associated with an index different from the subchannel index.

21. The method of claim 16, further comprising: Determine the sub-channel associated with the first-side crosslink control channel; as well as The third-side hop control channel is transmitted using the sub-channel based at least in part on the fact that the priority, demodulation reference signal mode, and subsequent control channel format are the same for the third-side hop control channel and the subsequent control channel. The third-side hop control channel indicates the set of reserved resources that can be used by the first UE.

22. The method of claim 16, further comprising: At least in part, this is based on the determination that the reserved resource set is available for use by the first UE to communicate with the target UE via the reserved resource set.

23. The method of claim 16, further comprising: The transmit power for communicating with the target UE via the reserved resource set is determined at least in part based on the unsuccessful decoding of the second side link control channel.

24. An apparatus for wireless communication at a first user equipment (UE), comprising: processor, Memory coupled to the processor; as well as Instructions, which are stored in the memory and can be executed by the processor, cause the device to perform the following operations: Receive a first sidelink control channel from the second UE indicating a set of reserved resources for sidelink communication associated with the second UE; The second side cross-link control channel from the second UE is decoded at least in part based on the first side cross-link control channel; as well as The reserved resource set is determined to be available for use by the first UE based at least in part on the decoding of the second side crosslink control channel, the radius of the second side crosslink control channel, and the distance between the first UE and the second UE.

25. The apparatus of claim 24, wherein the instructions may also be executed by the processor to cause the apparatus to perform the following operations: Confirm that the decoding of the second-side link control channel was successful; and The radius of the second-side cross-link control channel is determined at least in part based on the successful decoding of the second-side cross-link control channel, wherein, The reserved resource set is determined to be available based at least in part on a first distance exceeding a threshold distance, corresponding to the difference between the distance between the first UE and the second UE and the radius of the second side link control channel.

26. The apparatus of claim 25, wherein the instructions may also be executed by the processor to cause the apparatus to perform the following operations: The threshold distance is determined at least in part based on a second distance between the second UE and the target UE associated with the first side link control channel, and the path loss between the first UE and the second UE.

27. The apparatus of claim 26, wherein the instructions may also be executed by the processor to cause the apparatus to perform the following operations: The modulation and coding scheme (MCS), beta offset, control format, or any combination thereof associated with the second side cross-link control channel is identified, at least in part, based on the decoding of the first side cross-link control channel; and The second distance between the second UE and the target UE is determined at least in part based on the MCS associated with the second side link control channel, the beta offset, the control format, or any combination thereof.

28. The apparatus of claim 26, wherein the instructions may also be executed by the processor to cause the apparatus to perform the following operations: The reference signal is received using the first side crosslink control channel, the second side crosslink control channel, or the side crosslink data channel, or any combination thereof, wherein, The path loss between the first UE and the second UE is determined at least in part based on power measurements associated with the reference signal.

29. The apparatus according to claim 28, wherein, The power measurement is the Reference Signal Received Power (RSRP), the Reference Signal Strength Indicator (RSSI), or a combination thereof.

30. The apparatus of claim 25, wherein the instructions may also be executed by the processor to cause the apparatus to perform the following operations: The threshold distance is determined at least in part based on an alpha factor corresponding to the path loss exponent, the signal-to-interference-plus-noise ratio (SINR) target, the spatial transmission type, or any combination thereof.

31. The apparatus of claim 24, wherein the instructions may also be executed by the processor to cause the apparatus to perform the following operations: The transmit power for communicating with the target UE using the reserved resource set is determined at least in part based on the radius of the second side link control channel and the distance between the first UE and the second UE.

32. The apparatus of claim 24, wherein the instructions may also be executed by the processor to cause the apparatus to perform the following operations: Receive one or more additional sidelink control channels, each additional sidelink control channel indicating a corresponding set of reserved resources for sidelink communication; Determine a subset of reserved resources available for use by the first UE, the subset of reserved resources being derived from the corresponding set of reserved resources and the set of reserved resources; and Use the reserved resource subset to communicate with the target UE.

33. The apparatus of claim 32, wherein the instructions may also be executed by the processor to cause the apparatus to perform the following operations: The reserved resource subset is determined at least in part based on the corresponding transmit power for the one or more additional sidelink control channels.

34. The apparatus of claim 32, wherein the instructions may also be executed by the processor to cause the apparatus to perform the following operations: The corresponding distance for the one or more additional side link control channels is determined at least in part based on the corresponding successful decoding process for the one or more additional side link control channels; and The reserved resource subset is determined at least in part based on the corresponding distances associated with the one or more additional sidelink control channels.

35. The apparatus of claim 24, wherein the instructions may also be executed by the processor to cause the apparatus to perform the following operations: Select a sub-channel from the sub-channel set for sidelink communication with the target UE via the reserved resource set, wherein... The sub-channel is different from the sub-channel used for the first side link control channel.

36. The apparatus of claim 24, wherein the instructions may also be executed by the processor to cause the apparatus to perform the following operations: Receive an indication of the sub-channel index of the first-side cross-link control channel within the field of the first-side cross-link control channel; and Select a sub-channel from the sub-channel set for sidelink communication with the target UE via the reserved resource set, wherein... The subchannel is associated with an index that is different from the subchannel index.

37. The apparatus of claim 24, wherein the instructions may also be executed by the processor to cause the apparatus to perform the following operations: Determine the sub-channel associated with the first-side crosslink control channel; and The third-side hop control channel is transmitted using the sub-channel based at least in part on the fact that the priority, demodulation reference signal mode, and subsequent control channel format are the same for the third-side hop control channel and the subsequent control channel. The third-side hop control channel indicates the set of reserved resources that can be used by the first UE.

38. The apparatus of claim 24, wherein the instructions may also be executed by the processor to cause the apparatus to perform the following operations: At least in part, this is based on the determination that the reserved resource set is available for use by the first UE to communicate with the target UE via the reserved resource set.

39. An apparatus for wireless communication at a first user equipment (UE), comprising: processor, Memory coupled to the processor; as well as Instructions, which are stored in the memory and can be executed by the processor, cause the device to perform the following operations: Receive a first sidelink control channel from the second UE indicating a set of reserved resources for sidelink communication associated with the second UE; The second side cross-link control channel from the second UE is monitored at least in part based on the first side cross-link control channel; as well as The reserved resource set is determined to be available for use by the first UE based at least in part on the monitoring of the second-side cross-link control channel, wherein the reserved resource set is determined to be available based at least in part on the unsuccessful decoding of the second-side cross-link control channel.

40. The apparatus of claim 39, wherein the instructions may also be executed by the processor to cause the apparatus to perform the following operations: Receive one or more additional sidelink control channels, each additional sidelink control channel indicating a corresponding set of reserved resources for sidelink communication; Determine a subset of reserved resources available for use by the first UE, the subset of reserved resources being derived from the corresponding set of reserved resources and the set of reserved resources; and Use the reserved resource subset to communicate with the target UE.

41. The apparatus of claim 40, wherein the instructions may also be executed by the processor to cause the apparatus to perform the following operations: The reserved resource subset is determined at least in part based on the corresponding transmit power for the one or more additional sidelink control channels.

42. The apparatus of claim 39, wherein the instructions may also be executed by the processor to cause the apparatus to perform the following operations: Select a sub-channel from the sub-channel set for sidelink communication with the target UE via the reserved resource set, wherein... The sub-channel is different from the sub-channel used for the first side link control channel.

43. The apparatus of claim 39, wherein the instructions may also be executed by the processor to cause the apparatus to perform the following operations: Receive an indication of the sub-channel index of the first-side cross-link control channel within the field of the first-side cross-link control channel; and Select a sub-channel from the sub-channel set for sidelink communication with the target UE via the reserved resource set, wherein... The subchannel is associated with an index that is different from the subchannel index.

44. The apparatus of claim 39, wherein the instructions may also be executed by the processor to cause the apparatus to perform the following operations: Determine the sub-channel associated with the first-side crosslink control channel; and The third-side hop control channel is transmitted using the sub-channel based at least in part on the fact that the priority, demodulation reference signal mode, and subsequent control channel format are the same for the third-side hop control channel and the subsequent control channel. The third-side hop control channel indicates the set of reserved resources that can be used by the first UE.

45. The apparatus of claim 39, wherein the instructions may also be executed by the processor to cause the apparatus to perform the following operations: At least in part, this is based on the determination that the reserved resource set is available for use by the first UE to communicate with the target UE via the reserved resource set.

46. ​​The apparatus of claim 39, wherein the instructions may also be executed by the processor to cause the apparatus to perform the following operations: The transmit power for communicating with the target UE via the reserved resource set is determined at least in part based on the unsuccessful decoding of the second side link control channel.

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