Techniques for dynamically updating a search space of a sidelink control channel

Abstract

Methods, systems, and devices are described for wireless communication. In some systems, a first user equipment (UE) can monitor, on a configured search space, a sidelink transmission from a second UE, such as a first portion of sidelink control information (SCI) and perform a blind decoding on the sidelink transmission. The first UE can receive, via lower layer signaling (e.g., via a second portion of the SCI or a sidelink data channel), signaling indicating an update to the search space and can monitor, on the updated search space, the sidelink transmission. The update to the search space can indicate blocking one or more monitoring occasions from the configured search space, adding one or more monitoring occasions to the configured search space, reactivating one or more previously blocked monitoring occasions, or switching from a first search space to a second search space.

Description

[0001] Cross-referencing

[0002] This patent application claims the benefit of U.S. Patent Application No. 17 / 124,099, filed December 16, 2021, entitled “TECHNIQUESFOR DYNAMICALLY UPDATING A SEARCH SPACE OF ASIDELINK CONTROL CHANNEL”, which has been assigned to the assignee of this application and is expressly incorporated herein by reference. Technical Field

[0003] The following discussion relates to wireless communications, including techniques for dynamically updating the search space of the side link control channel. 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 may be able to support communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multiple access systems include fourth-generation (4G) systems (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 may employ technologies such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), or Discrete Fourier Transform 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, multiple UEs can communicate with each other via side links. Summary of the Invention

[0006] The described technology relates to improved methods, systems, apparatuses, and devices for supporting techniques for dynamically updating the search space of a sidelink control channel. For example, a first user equipment (UE) may receive (e.g., via Radio Resource Control (RRC) signaling) a configuration of the search space, which the first UE may monitor in response to sidelink transmissions (such as Sidelink Control Information (SCI)) from a second UE. The first UE may receive the search space configuration from a serving base station or from the second UE, and the configured search space may include a first time and frequency resource set (which may be referred to herein as a monitoring timing). In some implementations of this disclosure, the first UE may receive signaling from the second UE indicating an update to the configured search space. Such an update to the configured search space may include blocking some resources from the first time and frequency resource set, adding some resources to the first time or frequency resource set, reactivating some resources (e.g., previously blocked), or switching from the first time and frequency resource set to a second time and frequency resource set, and other examples.

[0007] The first UE may receive signaling indicating an update to the search space via an SCI (e.g., the second part of the SCI, which may be referred to herein as SCI-2) or on a sidelink data channel (such as the Physical Sidelink Shared Channel (PSSCH)). In some examples, in addition to indicating an update to the search space, the signaling may also (explicitly or implicitly) indicate a timer defining the duration of the update to the search space, or an offset for indicating the time at which the update to the search space should be applied, or both. Thus, the first UE may apply the update to the search space (e.g., for the duration of the timer or based on the offset, or both), and may monitor sidelink transmissions from the second UE on the updated search space. Similarly, when the update to the search space is active (or valid), the second UE may send sidelink transmissions to the first UE on the updated search space.

[0008] A method for wireless communication at a first user equipment (UE) is described. The method may include: receiving a configuration of a search space for the first UE, the search space including a first set of multiple monitoring opportunities of a sidelink control channel; receiving from a second UE signaling an indication of an update to the search space, the update being associated with one or more monitoring opportunities of the sidelink control channel; monitoring a second set of multiple monitoring opportunities of the sidelink control channel based on the configuration of the search space and the update to the search space; and receiving a first portion of a Sidelink Control Channel Interchange (SCI) based on the monitoring.

[0009] 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 are executable by the processor to cause the apparatus to: receive a configuration of a search space for the first UE, the search space including a first set of multiple monitoring opportunities of a sidelink control channel; receive signaling from a second UE indicating an update to the search space, the update being associated with one or more monitoring opportunities of the sidelink control channel; monitor a second set of multiple monitoring opportunities of the sidelink control channel based on the configuration of the search space and the update of the search space; and receive a first portion of a Sidelink Control Channel Interchange (SCI) based on the monitoring.

[0010] Another apparatus for wireless communication at a first UE is described. The apparatus may include: a unit for receiving a configuration of a search space for the first UE, the search space including a first set of multiple monitoring opportunities of a sidelink control channel; a unit for receiving signaling from a second UE indicating an update to the search space, the update being associated with one or more monitoring opportunities of the sidelink control channel; a unit for monitoring a second set of multiple monitoring opportunities of the sidelink control channel based on the configuration of the search space and the update of the search space; and a unit for receiving a first portion of the SCI based on the monitoring.

[0011] A non-transitory computer-readable medium is described, storing code for wireless communication at a first UE. The code may include processor-executable instructions to: receive a configuration of a search space for the first UE, the search space including a first set of multiple monitoring opportunities for a sidelink control channel; receive signaling from a second UE indicating an update to the search space, the update being associated with one or more monitoring opportunities of the sidelink control channel; monitor a second set of multiple monitoring opportunities of the sidelink control channel based on the configuration of the search space and the update of the search space; and receive a first portion of the SCI based on the monitoring.

[0012] In some examples of the methods, apparatuses and non-transitory computer-readable media described herein, receiving signaling indicating an update to the search space may include operations, features, units or instructions for receiving indications of one or more monitoring opportunities from the search space blocking side of the link control channel, wherein a second set of multiple monitoring opportunities includes the difference between the first set of multiple monitoring opportunities and one or more monitoring opportunities.

[0013] In some examples of the methods, apparatuses and non-transitory computer-readable media described herein, receiving signaling indicating an update to the search space may include operations, features, units or instructions for performing the following: receiving an indication of one or more monitoring opportunities to add a sidelink control channel to the search space, wherein the second set of multiple monitoring opportunities includes the sum of the first set of multiple monitoring opportunities and one or more monitoring opportunities.

[0014] In some examples of the methods, apparatuses and non-transitory computer-readable media described herein, receiving signaling indicating an update to the search space may include operations, features, units or instructions for receiving an indication to reactivate one or more monitoring opportunities for the side link control channel, wherein the second set of multiple monitoring opportunities includes at least one or more monitoring opportunities.

[0015] In some examples of the methods, apparatuses and non-transitory computer-readable media described herein, a first UE is configured with a set of search spaces including at least two search spaces, wherein receiving the configuration of the search spaces includes: receiving a first indication to a first search space in the set of search spaces, and receiving signaling indicating an update to the search space includes: receiving a second indication to switch from the first search space to a second search space in the set of search spaces.

[0016] In some examples of the methods, apparatuses and non-transitory computer-readable media described herein, a first search space may be associated with a first monitoring timing blocking mode, and a second search space may be associated with a second monitoring timing blocking mode.

[0017] In some examples of the methods, apparatuses and non-transitory computer-readable media described herein, receiving signaling indicating an update to the search space may include operations, features, units or instructions for receiving a timer indicating a pause in the update to the search space, wherein the update to the search space may be valid for the duration of the timer and invalid when the timer expires.

[0018] In some examples of the methods, apparatuses and non-transitory computer-readable media described herein, receiving signaling instructing an update to the search space may include operations, features, units or instructions for receiving a time offset instructing the application of an update to the search space.

[0019] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for sending an acknowledgment to a second UE of a signaling indicating an update to the search space.

[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: measuring the channel quality of the measuring-side crosslink control channel; and sending a measurement report to a second UE based on the channel quality of the measuring-side crosslink control channel, the measurement report including interference measurements associated with at least one of a first set of multiple monitoring times, wherein updates to the search space may be based on the interference measurements.

[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: receiving an indication of a threshold associated with the transmission of a measurement report, wherein transmitting a measurement report including an interference measurement associated with at least one of a first set of plurality of monitoring times may be based on the interference measurement exceeding a threshold.

[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 the following: receiving a periodic transmission schedule for a measurement report from a second UE, wherein sending the measurement report may be based on the periodic transmission schedule.

[0023] In some examples of the methods, apparatuses and non-transitory computer-readable media described herein, signaling indicating an update to the search space may be received via a second part of the SCI or a sidelink data channel.

[0024] In some examples of the methods, apparatuses and non-transitory computer-readable media described herein, updates to the search space are applied to one or both of the forward or reverse links.

[0025] A method for wireless communication at a second UE is described. The method may include: identifying a configuration of a search space for a first UE, the search space including a first set of multiple monitoring opportunities of a sidelink control channel; sending signaling to the first UE indicating an update to the search space, the update being associated with one or more monitoring opportunities of the sidelink control channel; and sending a first portion of a search space communication interface (SCI) to the first UE on a subset of a second set of multiple monitoring opportunities of the sidelink control channel based on the configuration of the search space and the update to the search space.

[0026] An apparatus for wireless communication at a second UE is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions are executable by the processor to cause the apparatus to: identify a configuration of a search space for a first UE, the search space including a first set of multiple monitoring times of a sidelink control channel; send signaling to the first UE indicating an update to the search space, the update being associated with one or more monitoring times of the sidelink control channel; and, based on the configuration of the search space and the update to the search space, send a first portion of a SCI to the first UE on a subset of a second set of multiple monitoring times of the sidelink control channel.

[0027] Another apparatus for wireless communication at a second UE is described. The apparatus may include: a unit for identifying a configuration of a search space for a first UE, the search space including a first set of multiple monitoring times of a sidelink control channel; a unit for sending signaling to the first UE indicating an update to the search space, the update being associated with one or more monitoring times of the sidelink control channel; and a unit for sending a first portion of a SCI to the first UE on a subset of a second set of multiple monitoring times of the sidelink control channel based on the configuration of the search space and the update to the search space.

[0028] A non-transitory computer-readable medium is described, storing code for wireless communication at a second UE. The code may include processor-executable instructions to: identify a configuration of a search space for a first UE, the search space including a first set of multiple monitoring times of a sidelink control channel; send signaling to the first UE indicating an update to the search space, the update being associated with one or more monitoring times of the sidelink control channel; and, based on the configuration of the search space and the update to the search space, send a first portion of a SCI to the first UE on a subset of a second set of multiple monitoring times of the sidelink control channel.

[0029] In some examples of the methods, apparatuses and non-transitory computer-readable media described herein, sending signaling indicating an update to the search space may include operations, features, units or instructions for performing the following: sending indications for one or more monitoring opportunities from the search space blocking side of the link control channel, wherein a second set of multiple monitoring opportunities includes the difference between the first set of multiple monitoring opportunities and one or more monitoring opportunities.

[0030] In some examples of the methods, apparatuses and non-transitory computer-readable media described herein, sending signaling indicating an update to the search space may include operations, features, units or instructions for performing the following: sending an indication for one or more monitoring opportunities to add a sidelink control channel to the search space, wherein the second set of multiple monitoring opportunities includes the sum of the first set of multiple monitoring opportunities and one or more monitoring opportunities.

[0031] In some examples of the methods, apparatuses and non-transitory computer-readable media described herein, sending signaling indicating an update to the search space may include operations, features, units or instructions for sending an indication to reactivate one or more monitoring opportunities for the side link control channel, wherein the second set of multiple monitoring opportunities includes at least one or more monitoring opportunities.

[0032] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the method further includes: sending a first indication to a first UE for a first search space in a set of search spaces, and sending signaling indicating an update to the search space includes: sending a second indication for a switch from the first search space to a second search space in the set of search spaces.

[0033] In some examples of the methods, apparatuses and non-transitory computer-readable media described herein, a first search space may be associated with a first monitoring timing blocking mode, and a second search space may be associated with a second monitoring timing blocking mode.

[0034] In some examples of the methods, apparatuses and non-transitory computer-readable media described herein, sending a signal indicating an update to the search space may include an operation, feature, unit or instruction for sending a timer indicating a pause in the update to the search space, wherein the update to the search space may be valid for the duration of the timer and invalid when the timer expires.

[0035] In some examples of the methods, apparatuses and non-transitory computer-readable media described herein, sending signaling indicating an update to the search space may include operations, features, units or instructions for sending an offset of time indicating that an update to the search space should be applied.

[0036] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for receiving, from a first UE, confirmation of a signaling indicating an update to the search space.

[0037] 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 a measurement report from a first UE, the measurement report including interference measurements associated with at least one of a first set of plurality of monitoring times, wherein an update to the search space may be based on the interference measurements.

[0038] 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: sending an indication of a threshold associated with the transmission of a measurement report, wherein receiving a measurement report including an interference measurement associated with at least one of a first set of plurality of monitoring times may be based on the interference measurement exceeding the threshold.

[0039] 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: sending a periodic transmission schedule for a measurement report to a first UE, wherein receiving the measurement report may be based on the periodic transmission schedule.

[0040] In some examples of the methods, apparatuses and non-transitory computer-readable media described herein, signaling indicating an update to the search space may be transmitted via a second part of the SCI or a sidelink data channel.

[0041] In some examples of the methods, apparatuses and non-transitory computer-readable media described herein, updates to the search space are applied to one or both of the forward or reverse links. Attached Figure Description

[0042] Figure 1 and Figure 2 An example of a wireless communication system is shown that supports techniques for dynamically updating the search space of a side link control channel, according to various aspects of this disclosure.

[0043] Figure 3 An example of a resource pool is shown that supports techniques for dynamically updating the search space of a side link control channel, according to various aspects of this disclosure.

[0044] Figure 4 An example of a reservation scheme is shown that supports various aspects of this disclosure for dynamically updating the search space of the side link control channel.

[0045] Figure 5 An example of a time slot configuration supporting techniques for dynamically updating the search space of a side link control channel, according to various aspects of this disclosure, is shown.

[0046] Figure 6 An example of a process flow supporting techniques for dynamically updating the search space of a side link control channel, based on various aspects of this disclosure, is shown.

[0047] Figure 7 and Figure 8 A block diagram of an apparatus supporting techniques for dynamically updating the search space of a side link control channel, according to various aspects of this disclosure, is shown.

[0048] Figure 9 A block diagram of a communication manager supporting techniques for dynamically updating the search space of a side link control channel, according to various aspects of this disclosure, is shown.

[0049] Figure 10 A diagram of a system including a device for dynamically updating the search space of a side link control channel, according to various aspects of this disclosure, is shown.

[0050] Figures 11 to 14 A flowchart illustrating a method for dynamically updating the search space of a side link control channel, supported by various aspects of this disclosure, is shown. Detailed Implementation

[0051] When two communication devices communicate with each other on a sidelink (e.g., in the example where the two devices are user equipment (UEs) capable of communicating via a peer-to-peer link), one of the devices can monitor a resource pool based on sidelink control information (SCI) from the other device, and in some deployments, this resource pool may be relatively large. For example, in some Industrial Internet of Things (IoT) scenarios, the size of the resource pool that the two devices can monitor may increase, making blind decoding across the entire search space no longer feasible (e.g., based on device capabilities). Therefore, the two devices can employ a search space that includes a subset of the resources in the resource pool. In the example where the two devices employ such a search space, the two devices can receive or otherwise identify the configuration of the search space and can transmit and receive within the configured search space. However, such a configured search space can be configured in a semi-static manner and therefore can be updated relatively infrequently. This infrequent updating may lead to the use of suboptimal resources (e.g., resources experiencing high levels of interference or congestion).

[0052] In some implementations of this disclosure, two sidelink devices may support signaling for dynamically updating a configured search space (e.g., without reconfiguring the search space). For example, a transmitting device (e.g., a device that transmits over the search space) may send an update to the search space to a receiving device, and accordingly, the transmitting device may transmit SCIs over the updated search space, and the receiving device may similarly monitor SCIs over the updated search space. In some examples, updating the search space may include: blocking one or more subchannels from a configured search space (causing the receiving device to avoid monitoring on such blocked subchannels), adding one or more subchannels to the search space (causing the UE to monitor on such added subchannels), reactivating previously blocked subchannels, or dynamically switching from one search space to a different search space (from a list of available or configured search spaces), and other examples.

[0053] In some examples, the transmitting device may send updates to the search space based on interference or congestion of some resources in the resource pool. For example, if one or more sub-channels of the resource pool are reserved or otherwise used by other devices (e.g., for a relatively long period of time), the transmitting UE may block one or more sub-channels from the search space. Alternatively, if one or both of the transmitting or receiving devices measure or otherwise determine that one or more sub-channels are experiencing a relatively high level of interference, the transmitting device may block one or more sub-channels from the search space. For example, the receiving device may measure the interference measurement or value of at least a subset of the sub-channels of the configured search space on a side link channel between two devices and send a measurement report indicating the measured interference. In such an example, the transmitting device may determine updates to the search space based on the measured interference.

[0054] Specific aspects of the subject matter described in this disclosure can be implemented to achieve one or more of the following potential advantages. The described techniques can be implemented to achieve more efficient power consumption or processing complexity, or both, at the receiving device via dynamic search space updates. For example, the described techniques can be implemented to reduce the power consumption and processing complexity of the receiving device based on blocking one or more sub-channels experiencing relatively high levels of interference or congestion, because the receiving device can avoid performing blind decoding on any sub-channels in the blocked sub-channels. Furthermore, by blocking sub-channels from a configured search space according to the level of interference or congestion, the receiving device can achieve this reduction in power consumption or processing complexity while experiencing increased reliability of SCI transmission, because the transmitting device will similarly avoid transmitting SCI on any sub-channels in the blocked sub-channels. Therefore, the increased likelihood of successful SCI communication (and any communication scheduled by the SCI) for both devices can improve spectral efficiency and lead to increased data rates and system capacity, among other benefits. Furthermore, the described techniques can be implemented to add sub-channels to the search space or reactivate previously blocked sub-channels, which avoids a complete reconfiguration of the search space, as the search space can be maintained over time via dynamic updates or modifications.

[0055] First, various aspects of this disclosure are described within the context of a wireless communication system. Additional aspects of this disclosure are illustrated and described with reference to resource pools, reservation schemes, time slot configurations, and process flows. Further aspects of this disclosure are illustrated and described with reference to apparatus diagrams, system diagrams, and flowcharts relating to techniques for dynamically updating the search space of the side link control channel.

[0056] Figure 1 Examples of a wireless communication system 100 supporting techniques for dynamically updating the search space of a sidelink control channel, 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-A Pro 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.

[0057] 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 geographical coverage area 110, and UE 115 and base station 105 can establish one or more communication links 125 on the geographical coverage area 110. The geographical 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.

[0058] UE 115 can be distributed throughout the entire geographical 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 may be able to communicate 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.

[0059] 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.

[0060] 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 other suitable terms.

[0061] 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, IoT device, Internet of Things (IoE) device, or machine-type communication (MTC) device, and other examples, which may be implemented in various items such as appliances, vehicles, meters, and other examples.

[0062] The UE 115 described in this document may be able to communicate with various types of devices, such as other UE 115s that may 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) Figure 1 As shown.

[0063] UE 115 and base station 105 can communicate wirelessly with each other via one or more communication links 125 on one or more carriers. The term "carrier" can refer to a 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.

[0064] In some examples (e.g., in a carrier aggregation configuration), the carrier may also have acquisition signaling or control signaling to coordinate operations against other carriers. The carrier may be associated with a frequency channel (e.g., an Evolved Universal Mobile Telecommunications System Terrestrial Radio Access (E-UTRA) Absolute Radio Frequency Channel Number (EARFCN)) and may be positioned according to a channel grid for discovery by UE 115. The carrier may operate in standalone mode, where UE 115 may initiate acquisition and connection via the carrier, or the carrier may operate in non-standalone mode, where different carriers (e.g., the same or different radio access technologies) are used to anchor the connection.

[0065] 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).

[0066] 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.

[0067] 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 through 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.

[0068] 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.

[0069] 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).

[0070] 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.

[0071] 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)).

[0072] 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 for 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.

[0073] 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 used to distinguish adjacent cells (e.g., Physical Cell Identifier (PCID), Virtual Cell Identifier (VCID), or other identifier). 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.

[0074] Macro cells typically cover a relatively large geographic 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 or 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.

[0075] 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)).

[0076] 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 the different geographic coverage areas 110 may be supported by the same base station 105. In other examples, overlapping geographic coverage areas 110 associated with different technologies may be supported by different base stations 105. 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.

[0077] 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.

[0078] Some UE 115s (e.g., MTC or IoT devices) can be low-cost or low-complexity devices and can provide automated communication between machines (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.

[0079] 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 the carrier.

[0080] 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 may include private or group communication and may 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 may include service prioritization, and mission-critical services may 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.

[0081] In some examples, UE 115 may also be able to communicate directly with other UE 115s on a device-to-device (D2D) communication link 135 (e.g., using peer-to-peer (P2P) or D2D protocols). One or more UEs 115s utilizing D2D communication may be within the geographic coverage area 110 of base station 105. Other UEs 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 UEs 115s communicating via D2D communication may utilize a one-to-many (1:M) system, wherein each UE 115 transmits to each 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 UEs 115 without involving base station 105.

[0082] 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, vehicles may communicate using vehicle-to-everything (V2X) communication, vehicle-to-vehicle (V2V) communication, or some combination of these. Vehicles may signal information relating to traffic conditions, signal control, weather, safety, emergencies, or any other information relating to the V2X system. In some examples, vehicles 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.

[0083] 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 (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 (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 IP service 150 for one or more network operators. IP services 150 may include access to the Internet, intranets, IP Multimedia Subsystem (IMS), or packet-switched streaming services.

[0084] 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).

[0085] Wireless communication system 100 can operate using one or more frequency bands (sometimes in the range of 300 MHz to 300 GHz). Typically, the region from 300 MHz to 3 GHz is referred to as the Ultra High Frequency (UHF) region or decimeter band because the wavelength range 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).

[0086] 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 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 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.

[0087] 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, peer-to-peer (P2P) transmissions, or digital-to-digital (D2D) transmissions, and other examples.

[0088] 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 (e.g., 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.

[0089] 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).

[0090] Beamforming (which may also be referred to as spatial filtering, directional transmission, or directional reception) is a signal processing technique that can be used at a transmitting 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 other signals 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).

[0091] 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.

[0092] 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.

[0093] 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).

[0094] 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).

[0095] 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 segmentation 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.

[0096] 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.

[0097] In some cases, two UEs 115 can communicate with each other via a communication link 135 (e.g., a sidelink). In such cases, for example, a first UE 115 can receive one or more sidelink transmissions from a second UE 115 on a sidelink channel, which may include one or both of a sidelink control channel or a sidelink data channel. For example, the first UE 115 can receive a first portion of the SCI (which may be referred to herein as SCI-1) on a sidelink control channel such as the Physical Sidelink Control Channel (PSCCH), and a second portion of the SCI (which may be referred to herein as SCI-2) and data on a sidelink data channel such as the Physical Sidelink Shared Channel (PSSCH).

[0098] In some deployment scenarios, such as cellular V2X (C-V2X) deployments or industrial IoT deployments, the first UE 115 and the second UE 115 can determine or otherwise identify the resource allocation (which can be carried on the PC5 link) for communication between the first UE 115 and the second UE 115, depending on various modes. For example, in a first mode, the serving base station 105 can assign transmission resources for sidelink communication between the first UE 115 and the second UE 115 via downlink control information (DCI) (such as DCI 3_0). For example, in a first mode, the base station 105 can send DCI 3_0 indicating the allocation of time and frequency resources and transmission timing to at least one of the first UE 115 or the second UE 115. Furthermore, in the first mode, the serving base station 105 can support dynamic or configured permission, including configured permission type 1 (which can be activated via RRC signaling from base station 105) and configured permission type 2 (which can be provided by the downlink control channel and activated via Layer 1 (L1) signaling). The second UE 115 can select the modulation and coding scheme (MCS) for sidelink transmission within the limitations set by base station 105 (e.g., a configured set or range from the MCS).

[0099] In the second mode, the second UE 115 (e.g., the transmitting UE 115) can autonomously (e.g., without signaling from base station 105) select resources for sidelink communication between the first UE 115 and the second UE 115. Furthermore, in the second mode, the second UE 115 can perform channel sensing based on blind decoding of the PSCCH channels (e.g., all PSCCH channels) to determine or otherwise identify which PSCCH resources are reserved by other sidelink transmissions. The second UE 115 can report to the upper layer which PSCCH resources are available (e.g., which sensed PSCCH resources are not reserved by other sidelink transmissions), and the upper layer can decide or otherwise determine resource usage for sidelink transmissions to the first UE 115.

[0100] The first UE 115 (e.g., receiving UE 115) can behave similarly or identically in both the first mode and the second mode. For example, in either the first or second mode, the first UE 115 can perform blind decoding in each (e.g., every) subchannel of the sidelink resource pool to find the SCI-1 carried on the PSCCH. Such a resource pool may include several subchannels over several time slots and can be shared among several UEs 115. Resource management of the resource pool can be performed at the base station 105 (in the example where the device communicates in the first mode), or the second UE 115 can autonomously select available resources from the resource pool (in the example where the device communicates in the second mode).

[0101] In some aspects, the resource pool may include between 1 and 27 sub-channels. Therefore, the first UE 115 may be able to perform blind decoding across the entire resource pool. For example, the first UE 115 may have blind decoding limits associated with its capabilities, such that blind decoding of any number of sub-channels between 1 and 27 is within the first UE 115's blind decoding limits. However, in some deployment scenarios, such as in industrial IoT deployments, the number of sub-channels within the resource pool may exceed the first UE 115's blind decoding limits. For example, the number of sub-channels in an industrial IoT resource pool may exceed 100, which may exceed the capabilities of the first UE 115 (e.g., as defined in the specification). Therefore, the first UE 115 and the second UE 115 may employ a search space that includes a subset of sub-channel locations to perform blind decoding of the PSCCH (allowing the first UE 115 to avoid blind decoding across the entire resource pool, which may exceed the UE 115's capabilities). Therefore, the second UE 115 can transmit SCI-1 on time and frequency resources included in the search space, and the first UE 115 can also perform blind decoding for SCI-1 on time and frequency resources included in the search space.

[0102] In some cases, the search space on which the first UE 115 and the second UE 115 can communicate can be configured in a semi-static manner, and can be reconfigured relatively infrequently via RRC signaling compared to changes in channel conditions or channel congestion rates. For example, some sub-channels of the configured search space can be reserved for use by other UEs 115, or may experience relatively high levels of interference, such that even if the second UE 115 transmits SCI-1 on these sub-channels, the first UE 115 will have a relatively low probability of successfully receiving and decoding SCI-1.

[0103] In some implementations of this disclosure, the second UE 115 may send physical layer or media access control (MAC) layer signaling to the first UE 115 indicating an update to the search space. The update to the search space may be associated with, or otherwise relate to, some time and frequency resources of a configured search space or a resource pool including a configured search space, and such time and frequency resources may be referred to herein as a monitoring opportunity. For example, a monitoring opportunity may refer to a subchannel and a timeslot or a PSCCH location within a timeslot (e.g., which may occupy 2 or 3 symbols). Therefore, the first UE 115 may apply the update to the search space and monitor SCI-1 from the second UE 115 on the updated search space. This dynamic configuration or modification of the search space on which the first UE 115 and the second UE 115 can communicate can avoid wasting resources used by other UE 115 on blind decoding processing tasks, provide techniques for congestion avoidance, and reduce signaling overhead, because the dynamic configuration or modification of the search can provide an alternative to a complete reconfiguration of the search space (e.g., a static configuration of the other half).

[0104] Figure 2 An example of a wireless communication system 200 supporting techniques for dynamically updating the search space of a sidelink control channel, according to various aspects of this disclosure, is shown. The wireless communication system 200 includes a base station 105-a, several programmable logic controllers (PLCs) 210, and several sensors / actuators (S / A) 215. Each of the PLCs 210 and S / A 215 can be as described in reference... Figure 1 An example of UE 115 as described (or may otherwise be referred to or understood as such) Figure 1 (Described UE 115). In some examples, PLC 210 (which can be used as the sending UE 115) can send signaling to S / A 215 (which can be used as the receiving UE 115) indicating an update to the configured search space, and S / A 215 can accordingly monitor control signaling from PLC 210 on the updated search space.

[0105] For example, wireless communication system 200 can illustrate an implementation of this disclosure in an industrial IoT deployment, where PLC 210 (e.g., a controller) and S / A 215 can communicate directly with each other on side link 225. In some aspects, each of the S / A 215s can be located at different locations on the industrial IoT device, such as a robotic arm or assembly line. In some cases, wireless communication system 200 can be deployed flexibly and simply using a wireless PLC 210. Furthermore, in some cases, PLC 210 can control several S / A 215s. For example, in some deployments, PLC 210 can control between 20 and 50 S / A 215s. Communication between PLC 210 and S / A 215s may experience tight latency (e.g., approximately 1 ms or 2 ms) and ultra-high reliability constraints (e.g., 10...). -6 (Error rate). Additionally, in some cases, communication via base station 105-a may employ multiple over-the-air (OTA) interfaces or communication links, which could affect the latency and reliability of communication between devices in the wireless communication system 200. Therefore, the PSCCH on which PLC 210 and S / A 215 can communicate can meet the stringent conditions or constraints associated with industrial IoT deployments.

[0106] In some aspects, industrial IoT operations may be deterministic and characterized by small packet sizes (e.g., sometimes between 32 and 256 bytes), which may be associated with low bandwidth usage. For example, a bandwidth allocation of 2 RBs for communication between devices in a wireless communication system 200 may be sufficient. In some cases, the S / A215 may have relatively low capabilities in terms of operating bandwidth and processing power (e.g., the S / A215 may be a low-capability or low-complexity device), but the overall bandwidth usage of industrial IoT applications may be large, and in some examples, may include dedicated or unlicensed frequency bands, or both. Therefore, the S / A215 may avoid detecting or monitoring some transmissions. Furthermore, and in part based on the number of PLCs 210 and S / A215 communicating with each other in an industrial IoT deployment, the deployment may experience challenging radio frequency environments, where congestion and interference may occur on some frequencies.

[0107] As shown in the wireless communication system 200, base station 105-a can communicate with PLC 210-b and PLC 210-c on access link 220-a and access link 220-b, respectively. In some examples, such as in an example where the wireless communication system 200 operates in a first resource allocation mode, base station 105-a can send one or more of dynamic permission, configured permission type 1, or configured permission type 2 to one or both of PLC 210-b or PLC 210-c. PLC 210-b and PLC 210-c can communicate with PLC 210-a on side link 225-a and side link 225-b respectively, and PLC 210-a (e.g., the central entity PLC) can communicate with S / A 215-a on side link 225-c, with S / A 215-b on side link 225-d, and with S / A 215-c on side link 225-e.

[0108] Furthermore, although PLC 210-a is shown outside the coverage of base station 105-a (e.g., there may be a lack of direct access link 220 between PLC 210-a and base station 105-a), PLC 210-a can be within the coverage of base station 105-a (e.g., enabling PLC 210-a to communicate directly with base station 105-a) without exceeding the scope of this disclosure. In some examples, such as in the example where PLC 210-a is outside the coverage of base station 105-a, PLC 210-a can operate according to a second sidelink resource management mode, wherein PLC 210-a autonomously selects resources for sidelink transmission based on a channel sensing process. In some other examples, such as in the example where PLC 210-a is within the coverage of base station 105-a, PLC 210-a operates according to a first sidelink resource management mode, wherein PLC 210-a requests or otherwise receives permission from base station 105-a for sidelink transmission.

[0109] PLC 210-a can send transmissions to S / A 215 to control and coordinate their actions. In some cases, for example, PLC 210-a can send transmissions to S / A 215 on a search space (e.g., the time and frequency resource set of PSCCH). For example, PLC 210-a can identify the configuration of the search space on which it can communicate with S / A 215. In some aspects, PLC 210-a can identify the configuration of the search space based on receiving a configuration from base station 105-a, from PLC 210-b, or PLC 210-c (which can be used as a relay node), or based on a default configuration. Similarly, S / A 215 can receive the configuration of the search space (to support mutual understanding of the search space). S / A 215 can receive configurations from base station 105-a or PLC 210-a. As described herein, the configured search space may include a subset of subchannels of the resource pool allocated to the wireless communication system 200 (e.g., allocated to PLC 210 and S / A 215).

[0110] PLC 210-a can select from the resources included in the search space which to transmit to S / A 215 based on which mode PLC 210-a is operating in. For example, in an example where PLC 210-a operates according to a first mode, PLC 210-a can receive resource assignments for transmission to S / A 215 from base station 105-a. Alternatively, in an example where PLC 210-a operates according to a second mode, PLC 210-a can select resources for transmission to S / A 215 based on sensing various sub-channels in the PSCCH (e.g., in the configured search space). In either mode, the resources on which PLC 210-a can transmit to S / A 215 can vary over time. For example, in an example where PLC 210-a operates according to the second mode, PLC 210-a can select resources based on which resources are available (e.g., not used by other devices such as other PLC 210s or S / A 215s), and the available resources can change over time as channel conditions or resource assignments change.

[0111] However, in some cases, the search space can be configured semi-statically, for example via RRC signaling, which can be correlated with a relatively long timeline compared to the frequency of changes in the resources that the PLC210-a transmits to the S / A 215. For example, the search space can be pre-configured with one or more monitoring opportunities, such as sub-channel indices for monitoring (e.g., sub-channel indices 1, 5, 7, etc.) and monitoring periods for these sub-channel indices. This mismatch and inability to modify the configured search space based on channel conditions or congestion can be inefficient, as the S / A 215 can periodically perform blind decoding on resources that are rarely used by the PLC 210-a.

[0112] In some implementations of this disclosure, the PLC 210-a can support dynamic configuration of the search space over which the PLC 210-a and S / A 215 communicate, based on the current channel conditions between the PLC 210-a and S / A 215. The PLC 210-a can transmit signaling indicating such an update to the search space via lower-layer signaling (such as physical layer signaling), which can be associated with lower latency compared to higher-layer signaling (such as RRC layer signaling). For example, the PLC 210-a can transmit signaling indicating an update to the search space via SCI (such as SCI-2) or data signaling carried by PSSCH. Furthermore, although this document describes the search space configured for forward link transmissions (e.g., transmissions from PLC 210-a to S / A 215) in the context of search space, signaling from PLC 210-a indicating an update to the search space may additionally or alternatively indicate an update to the search space configured for reverse link transmissions (e.g., transmissions from S / A 215 to PLC 210-a). PLC 210-a may update the search space based on various factors, including determining (or sensing) that some resources in the configured search space have been taken by other PLCs 210 (such as PLC 210-b or PLC 210-c), or determining that some resources are otherwise preferred by one or more other PLCs 210 (so that PLC 210-a may relinquish such resources to avoid congestion).

[0113] For example, if PLC 210-a (or any transmitting UE 115) determines or senses that one or more sub-channels in the configured search space are reserved periodically or for a relatively long period of time (e.g., a period of time greater than a threshold) by another UE 115 (such as another PLC 210 or S / A 215), PLC 210-a can block one or more sub-channels from the search space (making the search space the configured search space minus the one or more blocked sub-channels). For example, if PLC 210-a determines that sub-channel index 1 and sub-channel index 5 are reserved by another UE 115 (or other UE 115) for the next 100 time slots, PLC 210-a can block sub-channel indices 1 and 5 from the search space to avoid unnecessary blind decoding of sub-channel indices 1 and 5 at S / A 215 (because PLC 210-a may not transmit on the sub-channels at indices 1 and 5 for at least the next 100 time slots).

[0114] Alternatively, PLC 210-a can determine or sense that one or more subchannels are idle and available (e.g., available), and signaling indicating an update to the search space can instruct the addition of index entries associated with one or more subchannels to the search space. Therefore, S / A 215 can monitor one or more subchannels being added based on received instructions to add one or more subchannels and perform blind decoding on them (e.g., in the future). Similarly, PLC 210-a can determine or sense that one or more (previously) blocked subchannel entries become idle again (e.g., become available after being reserved by other UEs 115 for a period of time or otherwise blocked from the search space), and signaling indicating an update to the search space can instruct the reactivation of one or more subchannels. Therefore, S / A 215 can resume monitoring and blind decoding of one or more reactivated subchannels.

[0115] Alternatively, PLC 210-a and S / A 215 can be configured (e.g., via RRC signaling) to have one or more sets of search spaces, and PLC 210-a can instruct S / A 215 to switch from one search space monitoring group to a different search space monitoring group via signaling indicating an update to the search space. For example, PLC 210-a and S / A 215 can be configured (e.g., pre-configured) to have sets of search space types or groups, and each search space type or group can be associated with a different blocking mode (such that different search space types and groups have different characteristics of blocking sub-channel modes). For example, PLC 210-a and S / A 215 can support unrestricted search spaces (which can be associated with no or relatively few sub-channel blocking), type A search spaces (which can be associated with a first sub-channel blocking mode), and type B search spaces (which can be associated with a second sub-channel blocking mode different from the first sub-channel blocking mode).

[0116] Therefore, Type A and Type B search spaces can include blocked sub-channel entries, which can be pre-configured or pre-selected by PLC 210-a (e.g., transmitting UE 115) to avoid congestion or conflicts between devices such as S / A 215. In some aspects, Type A and Type B search spaces can be used when PLC 210-a or S / A 215 enters a low-power mode or power-saving mode. In such an example where PLC 210-a and S / A 215 can be configured with one or more sets of search spaces, signaling indicating an update to the search space can indicate a switch to the Type-X search space (instead of indicating one or more blocking or adding commands). Each search space in the search space set can be configured (e.g., updated or otherwise modified), and in some respects, a first search space (e.g., search space group 1) can be configured as the default search space, and the S / A 215 can switch from the default search space (e.g., search space group 2) based on a command from the PLC 210-a (e.g., via bits in SCI-2 or PSSCH). Therefore, if interference or congestion in one search space group is more severe than in another search space group, the PLC 210-a and S / A 215 can have a flexible adaptive characteristic for short periods of time.

[0117] In some implementations, PLC 210-a may also instruct a timer in the signaling indicating an update to the search space that suspends the update. For example, PLC 210-a may block, add, or reactivate sub-channel entries for a period defined by the timer, such that the update to the search space is valid for the duration of the timer and invalid when the timer expires. In some other implementations, the timer indicating a suspension of the search space update may be configured to a default value at S / A 215 (e.g., in the absence of explicit signaling from PLC 210-a). Alternatively or additionally, the signaling indicating an update to the search space may include an offset or timer parameter indicating the time for applying the update. For example, based on receiving signaling indicating an update to the search space and including an offset indicating the time for applying the update, S / A 215 may block, add, or reactivate sub-channel entries to or from the search space according to the update at the time indicated by the offset or timer. In some respects, offset can refer to the time delay until the application updates the search space (e.g., the number of time slots, such as 2 time slots). In addition to updating which sub-channels are included in the search space, or as an alternative to updating which sub-channels are included in the search space, the PLC210-a can also update the monitoring period associated with the search space or any other parameters associated with the search space.

[0118] The PLC 210-a can send signaling indicating updates to the search space via SCI-2 or data on the PSSCH. In an example where the PLC 210-a provides updates to the search space via SCI-2, the PLC 210-a can send the updates via a specific format of SCI-2 or via one or more fields of SCI-2. Such fields of SCI-2 may include: one or more command indication fields indicating blocking, adding, reactivating, switching, or any other update to the search space; a search space identifier field indicating the search space index in the forward or reverse link corresponding to the update; one or more search space entry fields indicating the subchannel entry of the search space to which the update command applies; a timer field indicating the time period (e.g., in time slots) on which the update to the search space is valid; an offset field indicating the time of execution of the update command; an indication field including requests for auxiliary information or update commands; or any combination thereof. In an example of sending signaling indicating an update to the search space via PSSCH, PSSCH can utilize a MAC channel or an upper-layer logical channel with a design that includes a Reference Signal Received Power (RSRP) measurement report to carry the update to the search space. For example, if PLC 210-a requests complete auxiliary information associated with the search space of S / A215, the complete RSRP measurement report can include a relatively large number of bits in the payload, which can be carried more efficiently via PSSCH compared to SCI-2.

[0119] Based on the received signaling indicating an update to the search space, S / A 215 can acknowledge the command (e.g., update) by sending an acknowledgment of the signaling indicating an update to the search space. For example, S / A 215 can send feedback to PLC 210-a in response to a search space update. In some aspects, S / A 215 can send feedback (e.g., acknowledgment) via a MAC control element (MAC-CE). Therefore, PLC 210-a and S / A 215 can ensure the reliability of commands from PLC 210-a for updating the search space. In some examples, S / A 215 or another UE 115 (a different S / A 215 or another PLC 210) can provide PLC 210-a with auxiliary information for updating the search space. In some cases, for example, PLC210-a (transmitting UE 115) may not be aware that a subchannel entry in the search space is occupied or is otherwise experiencing high levels of interference, but other UEs 115 may be aware of such occupancy or interference. Such occupancy or interference that PLC 210-a is unaware of can be referred to herein as a hidden node problem, and the difference in awareness of occupancy or interference may be a result of the different radio frequency environments experienced by various devices in the wireless communication system 200.

[0120] In some examples, S / A 215 or the other UE 115 may send auxiliary information to PLC 210-a to assist PLC 210-a in determining updates to the search space. Such auxiliary information may include one or more received signal strength measurements or interference measurements, such as RSRP measurements or Reference Signal Strength Indicator (RSSI) measurements. For example, S / A 215 or the other UE 115 may measure the quality of sub-channels in the search space and may send a measurement report to PLC 210-a indicating the measured channel quality of the sub-channels in the search space.

[0121] In some implementations, if S / A215 or the other UE 115 measures relatively large interference (e.g., relatively high energy level) in a subchannel entry in the search space, S / A215 or the other UE 115 can send a measurement report to PLC 210-a. In other words, the transmission of a measurement report can be triggered by a sufficiently large change in interference measurements in the search space. For example, in an example where S / A 215 or the other UE 115 senses a collision in a subchannel (a collision may occur if two UEs 115 (such as PLC 210 or S / A 215) reserve the same subchannel), S / A 215 or the other UE 115 can measure interference measurements (e.g., RSSI) above a threshold and can send a measurement report to PLC 210-a based on the interference measurement exceeding the threshold. In some aspects, PLC 210-a can send an indication of the threshold to S / A215. Alternatively, S / A 215 or the other UE 115 may periodically or in response to a request received from PLC 210-a to send measurement reports (e.g., auxiliary information).

[0122] PLC 210-a may receive measurement reports from S / A 215 or the other UE 115, and may determine or otherwise determine an update to the search space based on the provided measurement reports and on resource utilization in the search space (such as that measured from PLC 210-a). For example, PLC 210-a may send a search space update command to S / A 215 in response to receiving a measurement report from S / A 215 or the other UE 115, indicating an update to the search space (e.g., S / A 215 or the other UE 115 may request an update to the search space via the measurement report). In some other examples, PLC 210-a may give lower priority to resources indicated to have experienced interference or congestion by S / A 215 or the other UE 115 during resource selection. For example, in the example where PLC 210-a determines on which resource to send a message to S / A 215 (e.g., in operation according to the second mode), PLC 210-a may reduce the likelihood of selecting a resource experiencing interference or congestion relative to other resources in the search space. In some aspects, PLC 210-a may reduce this priority of the resource used in the resource selection process without notifying S / A 215.

[0123] Furthermore, PLCs 210 can communicate with each other and coordinate search space updates. For example, PLC 210-a can receive a measurement report from S / A 215-c indicating that S / A 215, controlled by PLC 210-b, is causing interference at S / A 215-c in the search space resources of S / A 215-c. In such an example, PLC 210-a can forward the measurement report to PLC 210-b or otherwise request PLC 210-b to update the search space of S / A 215, controlled by PLC 210-b, to reduce interference or congestion between S / A 215-c and S / A 215, controlled by PLC 210-b. Additionally, in some examples, updates to the search space can be requested by base station 105-a, other PLCs 210, or initiated at PLC 210-a.

[0124] Figure 3 An example of a resource pool 300 supporting techniques for dynamically updating the search space of a sidelink control channel, according to various aspects of this disclosure, is shown. The resource pool 300 may include several sub-channels 310 in the frequency domain and several time slots 305 in the time domain. In some examples, a first UE 115 (e.g., receiving UE 115, such as referenced...) Figure 2 The described S / A 215) and the second UE 115 (e.g., the sending UE 115, such as referenced) Figure 2 The described PLC 210 can be configured with a search space including a subset of resources of resource pool 300, and the second UE 115 can send a signaling instruction to the first UE 115 indicating an update to the search space.

[0125] In some respects, several UEs 115 can share resource pool 300, and in order to receive side-link packets, the first UE 115 can perform blind decoding on subchannel 310 and time slot 305 in the search space used by the first UE 115. The second UE 115 can transmit on PSCCH and PSSCH within the same time slot 305, such as via... Figure 5 Further illustrations and references Figure 5 Described. In some examples, PSSCH transmissions can occupy several consecutive subchannels 310. For example, a PSSCH transmission can occupy up to A continuous subchannel 310. In some aspects, the subchannel size in some deployments (such as V2X deployments) may include a lower limit of 10 RBs. PSCCH transmissions may occupy several subchannels 310 with the lowest subchannel index (e.g., up to one subchannel 310).

[0126] The second UE 115 can send SCI-1 on the PSCCH. SCI-1 can be equivalently referred to as the first-stage SCI, and SCI-1 can include information about the bandwidth of the corresponding PSCCH and resource reservations in future time slots. This document (including references) Figure 4 This describes additional information related to this reservation of resources in future time slots. The first UE 115 can locate and decode SCI-2 based on decoding the PSCCH carrying SCI-1; SCI-2 can be equivalently referred to as the second-stage SCI. SCI-2 may include a source identifier (ID) and a destination ID, which identify whether the packet was used by the first UE 115 and from which UE 115 (e.g., the second UE 115) the packet was sent.

[0127] Figure 4 An example of a reservation scheme 400 supporting techniques for dynamically updating the search space of the sidelink control channel, according to various aspects of this disclosure, is shown. Reservation scheme 400 illustrates how the SCI-1 carried in the PSCCH can indicate one or more resource reservations for an upcoming slot 405. In some implementations, if a second UE 115 (e.g., sending UE 115, such as referenced...) Figure 2 If the described PLC 210 determines that another UE 115 has periodically or for a relatively long duration (e.g., greater than the threshold number of timeslots 405), then the second UE 115 can send an update to the configured search space for blocking the sub-channel to avoid being blocked by the first UE 115 (e.g., the receiving UE 115, such as referenced). Figure 2 Unnecessary blind decoding is performed as described in S / A 215.

[0128] For example, SCI-1 can indicate resource reservations for several future time slots 405 via a number of bits. In some aspects, SCI-1 can indicate frequency domain resource allocations for two reservations using the number of bits defined by equation (1) shown below:

[0129]

[0130] As shown in Equation 1 This can refer to the number of sidelink subchannels. Furthermore, SCI-1 can indicate the allocation of frequency domain resources for the three reserved channels using the number of bits defined by equation (2) shown below:

[0131]

[0132] SCI-1 can also use 5 bits to indicate the reservation for 2 reserved time-domain resource allocations, and can use 9 bits to indicate the reservation for 3 reserved time-domain resource allocations. In some aspects, the reservation scheme 400 can show the reservation of resources for the SCI received at time slot i for time slots i+x and i+y, where 0 < x ≤ 31 and 0 < y ≤ 31. The reservation signaled by SCI-1 can be further described by Table 1, where each reservation can include the number of z subchannels.

[0133]

[0134] Table 1: Reservation Scheme 400

[0135] Figure 5 An example of a time slot configuration 500 is shown that supports techniques for dynamically updating the search space of a sidelink control channel in accordance with aspects of the present disclosure. The time slot configuration 500 shows a sidelink time slot that includes a reference symbol 505, PSCCH 510, PSSCH 515, gap 525-a, physical sidelink feedback channel (PSFCH) 520, and gap 525-b. In some examples, PSCCH 510 (and in some examples, PSSCH 515) can be included in the search space on which a first UE 115 can perform blind decoding for SCI-1 (and in some examples, SCI-2) from a second UE 115.

[0136] For example, PSCCH 510 can include SCI-1, and PSSCH 515 can include SCI-2, and the first UE 115 can perform blind decoding for SCI-1 or for both SCI-1 and SCI-2. In some aspects, PSCCH 510 can be configured (e.g., preconfigured) to occupy one of the {10, 12, 15, 20, 25} PRBs that can be restricted to a single subchannel, and the duration of PSCCH 510 can be configured (e.g., preconfigured) to be two or three symbols. In some aspects, a subchannel can occupy one of the {10, 15, 20, 25, 50, 75, 100} PRBs. For a resource pool, the size of PSCCH 510 can be fixed. For example, depending on the configuration, PSCCH 510 can be fixed at 10% to 100% of a single subchannel (e.g., in the first two or three symbols). In some aspects, PSSCH 515 can occupy at least one subchannel.

[0137] Figure 6An example of a process flow 600 supporting techniques for dynamically updating the search space of a sidelink control channel according to various aspects of this disclosure is shown. This process flow may include UE 115-a (e.g., a first UE 115) and UE 115-b (e.g., a second UE 115). In some aspects, UE 115-a may be a receiving UE 115 (such as referenced in...) Figure 2 The example described is S / A 215), and UE 115-b can be a sending UE 115 (such as also referred to). Figure 2 Example of PLC 210 described. In some implementations, UE 115-a can receive signaling indicating dynamic updates to a configured search space, and UE 115-a can monitor sidelink transmissions from UE 115-b on the dynamically updated search space.

[0138] At 605, UE 115-a may receive a configuration for its search space, which includes a first set of monitoring opportunities for the sidelink control channel. In some examples, UE 115-a may receive the search space configuration from UE 115-b. In other examples, UE 115-a may receive the search space configuration from serving base station 105. Monitoring opportunities may refer to resources in both the time and frequency domains, such as subchannels and time slots, or subchannels and several symbols. The first set of monitoring opportunities may include a subset of resources included in a resource pool shared among UE 115-a, UE 115-b, and potentially several other UEs 115. In some aspects, UE 115-a may receive the search space configuration in a semi-static manner (e.g., via RRC signaling).

[0139] At 610, in some implementations, UE 115-a can measure the channel quality of the sidelink control channel between UE 115-a and UE 115-b. In some examples, UE 115-a can measure each subchannel or monitoring opportunity in a first set of monitoring opportunities to identify whether any subchannel or monitoring opportunity in the first set of monitoring opportunities is experiencing a relatively high level of interference or congestion. For example, UE 115-a can measure the interference value or energy level associated with at least one monitoring opportunity in the first set of monitoring opportunities.

[0140] At 615, in some implementations, UE 115-a may send a measurement report to UE 115-b, the measurement report including interference measurements associated with at least one monitoring time in a first set of monitoring times. In some examples, UE 115-a may send the measurement report based on determining that a measured interference measurement exceeds a threshold. In some other examples, UE 115-a may send the measurement report based on a periodic transmission schedule received from UE 115-b. In some other examples, UE 115-a may send the measurement report based on a request from UE 115-b.

[0141] At 620, UE 115b can send signaling to UE 115-a indicating an update to the search space. An update to the search space can instruct the blocking of one or more sub-channels from a configured search space, the addition of one or more sub-channels to a configured search space, the reactivation of one or more (previously blocked) sub-channels, or any combination thereof. Alternatively, an update to the search space can instruct a switch from one search space in a set of configured search spaces to a different search space in a set of configured search spaces, each search space in the set being associated with a different monitoring timing blocking mode.

[0142] At 625, in some implementations, UE 115-a may send an acknowledgment of signaling indicating an update to the search space. In some examples, this transmission of acknowledgment of search space updates can support the reliability of the search space updates.

[0143] At 630, UE 115-a can monitor a second set of monitoring opportunities for the sidelink control channel based on the configuration and updates of the search space. For example, UE 115-a can monitor the configured search space minus one or more blocked monitoring opportunities, plus one or more added monitoring opportunities, plus (or otherwise include) one or more reactivated monitoring opportunities, or any combination thereof. Alternatively, UE 115-a can switch from monitoring the first search space associated with the first monitoring opportunity blocking mode based on the search space configuration to monitoring the second search space associated with the second monitoring opportunity based on updates to the search space.

[0144] At 635, UE 115-b can send the first part of the SCI (e.g., SCI-1) to UE 115-a on a subset of the second monitoring timing set of the sidelink control channel, based on the configuration of the search space and updates to the search space. Similarly, UE 115-a can receive SCI-1 based on monitoring and blind decoding on the second monitoring timing set.

[0145] Figure 7A block diagram 700 of a device 705 supporting techniques for dynamically updating the search space of a sidelink control channel, according to various aspects of this disclosure, is shown. Device 705 may be an example of various aspects of a UE 115 as described herein. Device 705 may include a receiver 710, a transmitter 715, and a communications manager 720. Device 705 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0146] Receiver 710 may provide a unit for receiving information (such as packets, user data, control information, or any combination thereof) associated with various information channels (e.g., control channels, data channels, information channels related to techniques for dynamically updating the search space of side link control channels). The information may be transmitted to other components of device 705. Receiver 710 may utilize a single antenna or a collection of multiple antennas.

[0147] Transmitter 715 may provide a unit for transmitting signals generated by other components of device 705. For example, transmitter 715 may transmit information (such as packets, user data, control information, or any combination thereof) associated with various information channels (e.g., control channels, data channels, information channels related to techniques for dynamically updating the search space of side link control channels). In some examples, transmitter 715 may be co-located with receiver 710 in a transceiver module. Transmitter 715 may utilize a single antenna or a collection of multiple antennas.

[0148] The communication manager 720, receiver 710, transmitter 715, or various combinations thereof, or various components thereof, may be examples of units for performing various aspects of the techniques described herein for dynamically updating the search space of the side link control channel. For example, the communication manager 720, receiver 710, transmitter 715, or various combinations thereof, or components thereof, may support methods for performing one or more of the functions described herein.

[0149] In some examples, the communication manager 720, receiver 710, transmitter 715, or various combinations or components thereof may be implemented in hardware (e.g., in communication management circuitry). The hardware may include a processor, digital signal 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 configured to or otherwise support units for performing the functions described herein. In some examples, the processor and memory coupled to the processor may be configured to perform one or more of the functions described herein (e.g., by executing instructions stored in memory by the processor).

[0150] Alternatively or concurrently, in some examples, the communication manager 720, receiver 710, transmitter 715, or various combinations or components thereof may be implemented using code executed by a processor (e.g., as communication management software or firmware). If implemented using processor-executed code, the functionality of the communication manager 720, receiver 710, transmitter 715, or various combinations or components thereof may be performed by any combination of a general-purpose processor, DSP, central processing unit (CPU), ASIC, FPGA, or these or other programmable logic devices (e.g., units configured or otherwise supported for performing the functions described in this disclosure).

[0151] In some examples, the communication manager 720 can be configured to use or otherwise cooperate with the receiver 710, transmitter 715, or both to perform various operations (e.g., receiving, monitoring, transmitting). For example, the communication manager 720 can receive information from the receiver 710, send information to the transmitter 715, or integrate with the receiver 710, transmitter 715, or both to receive information, send information, or perform various other operations as described herein.

[0152] According to the examples disclosed herein, the communication manager 720 can support wireless communication at a first UE. For example, the communication manager 720 can be configured or otherwise supported to support elements for receiving a configuration of a search space for the first UE, the search space including a first set of multiple monitoring opportunities for the sidelink control channel. The communication manager 720 can be configured or otherwise supported to support elements for receiving signaling from a second UE indicating an update to the search space, the update being associated with one or more monitoring opportunities for the sidelink control channel. The communication manager 720 can be configured or otherwise supported to support elements for monitoring a second set of multiple monitoring opportunities for the sidelink control channel based on the configuration of the search space and updates to the search space. The communication manager 720 can be configured or otherwise supported to support elements for receiving a first portion of the SCI based on monitoring.

[0153] Alternatively or additionally, according to the examples disclosed herein, the communication manager 720 may support wireless communication at the second UE. For example, the communication manager 720 may be configured or otherwise supported to support elements for identifying a configuration of a search space for the first UE, the search space including a first set of multiple monitoring opportunities of the sidelink control channel. The communication manager 720 may be configured or otherwise supported to support elements for sending signaling to the first UE indicating an update to the search space, the update being associated with one or more monitoring opportunities of the sidelink control channel. The communication manager 720 may be configured or otherwise supported to support elements for sending a first portion of the SCI to the first UE on a subset of a second set of multiple monitoring opportunities of the sidelink control channel based on the configuration of the search space and the update of the search space.

[0154] By including or configuring the communication manager 720 according to the examples described herein, device 705 (e.g., a processor that controls or is otherwise coupled to receiver 710, transmitter 715, communication manager 720, or a combination thereof) can support techniques for reducing processing, lowering power consumption, and utilizing communication resources more efficiently. For example, based on dynamically updating a configured search space according to current channel conditions (e.g., including channel interference or congestion), communication manager 720 can perform blind decoding with fewer monitoring opportunities, which can result in improved power savings and increased battery life at device 705.

[0155] Figure 8 A block diagram 800 of a device 805 supporting techniques for dynamically updating the search space of a sidelink control channel, according to various aspects of this disclosure, is shown. Device 805 may be an example of aspects of device 705 or UE 115 as described herein. Device 805 may include a receiver 810, a transmitter 815, and a communications manager 820. Device 805 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0156] Receiver 810 may provide a unit for receiving information (such as packets, user data, control information, or any combination thereof) associated with various information channels (e.g., control channels, data channels, information channels, and control channels related to techniques for dynamically updating the search space of side link control channels). The information may be transmitted to other components of device 805. Receiver 810 may utilize a single antenna or a collection of multiple antennas.

[0157] Transmitter 815 may provide a unit for transmitting signals generated by other components of device 805. For example, transmitter 815 may transmit information (such as packets, user data, control information, or any combination thereof) associated with various information channels (e.g., control channels, data channels, information channels related to techniques for dynamically updating the search space of side link control channels). In some examples, transmitter 815 may be co-located with receiver 810 in a transceiver module. Transmitter 815 may utilize a single antenna or a collection of multiple antennas.

[0158] Device 805 or its various components may be examples of units for performing various aspects of techniques described herein for dynamically updating the search space of a side-link control channel. For example, communication manager 820 may include search space configuration component 825, search space update component 830, monitoring component 835, SCI component 840, or any combination thereof. Communication manager 820 may be examples of various aspects of communication manager 720 as described herein. In some examples, communication manager 820 or its various components may be configured to use receiver 810, transmitter 815, or both, or otherwise cooperate with receiver 810, transmitter 815, or both to perform various operations (e.g., receiving, monitoring, transmitting). For example, communication manager 820 may receive information from receiver 810, transmit information to transmitter 815, or integrate with receiver 810, transmitter 815, or both to receive information, transmit information, or perform various other operations as described herein.

[0159] According to the examples disclosed herein, the communication manager 820 may support wireless communication at a first UE. The search space configuration component 825 may be configured or otherwise supported to support elements for receiving a configuration of a search space for the first UE, the search space including a first set of multiple monitoring opportunities for the sidelink control channel. The search space update component 830 may be configured or otherwise supported to support elements for receiving signaling from a second UE indicating an update to the search space, the update being associated with one or more monitoring opportunities for the sidelink control channel. The monitoring component 835 may be configured or otherwise supported to support elements for monitoring a second set of multiple monitoring opportunities for the sidelink control channel based on the search space configuration and updates to the search space. The SCI component 840 may be configured or otherwise supported to support elements for receiving a first portion of the SCI based on monitoring.

[0160] Alternatively or additionally, according to the examples disclosed herein, the communication manager 820 may support wireless communication at the second UE. The search space configuration component 825 may be configured or otherwise supported to include elements for identifying a configuration of a search space for the first UE, the search space including a first set of multiple monitoring moments of the sidelink control channel. The search space update component 830 may be configured or otherwise supported to include elements for sending signaling to the first UE indicating an update to the search space associated with one or more monitoring moments of the sidelink control channel. The SCI component 840 may be configured or otherwise supported to include elements for sending a first portion of an SCI to the first UE on a subset of a second set of multiple monitoring moments of the sidelink control channel based on the search space configuration and the update to the search space.

[0161] Figure 9 A block diagram 900 of a communication manager 920 supporting techniques for dynamically updating the search space of a side-link control channel, according to various aspects of this disclosure, is shown. The communication manager 920 may be an example of aspects of the communication manager 720, communication manager 820, or both, as described herein. The communication manager 920 or its various components may be examples of units for performing various aspects of the techniques described herein for dynamically updating the search space of a side-link control channel. For example, the communication manager 920 may include a search space configuration component 925, a search space update component 930, a monitoring component 935, an SCI component 940, a feedback component 945, a channel measurement component 950, a measurement reporting component 955, or any combination thereof. Each of these components may communicate directly or indirectly with each other (e.g., via one or more buses).

[0162] According to the examples disclosed herein, the communication manager 920 may support wireless communication at a first UE. The search space configuration component 925 may be configured or otherwise supported to support elements for receiving a configuration of a search space for the first UE, the search space including a first set of multiple monitoring opportunities for the sidelink control channel. The search space update component 930 may be configured or otherwise supported to support elements for receiving signaling from a second UE indicating an update to the search space, the update being associated with one or more monitoring opportunities for the sidelink control channel. The monitoring component 935 may be configured or otherwise supported to support elements for monitoring a second set of multiple monitoring opportunities for the sidelink control channel based on the search space configuration and updates to the search space. The SCI component 940 may be configured or otherwise supported to support elements for receiving a first portion of the SCI based on monitoring.

[0163] In some examples, to support receiving signaling indicating updates to the search space, the search space update component 930 may be configured or otherwise supported for receiving indications of one or more monitoring opportunities for blocking the cross-link control channel from the search space, wherein the second set of multiple monitoring opportunities includes the difference between the first set of multiple monitoring opportunities and one or more monitoring opportunities. In some examples, to support receiving signaling indicating updates to the search space, the search space update component 930 may be configured or otherwise supported for receiving indications of one or more monitoring opportunities for adding a cross-link control channel to the search space, wherein the second set of multiple monitoring opportunities includes the sum of the first set of multiple monitoring opportunities and one or more monitoring opportunities.

[0164] In some examples, to support receiving signaling indicating an update to the search space, the search space update component 930 may be configured, or otherwise supported, to support elements for receiving indications of one or more monitoring opportunities for reactivating the side link control channel, wherein the second set of multiple monitoring opportunities includes at least one or more monitoring opportunities. In some examples, the configuration for receiving the search space includes receiving a first indication of a first search space in the search space set. In some examples, receiving signaling indicating an update to the search space includes receiving a second indication of a switch from the first search space to a second search space in the search space set.

[0165] In some examples, a first search space is associated with a first monitoring timing blocking mode, and a second search space is associated with a second monitoring timing blocking mode. In some examples, to support receiving signaling indicating an update to the search space, the search space update component 930 may be configured or otherwise support elements for receiving a timer indicating a pause in the update to the search space, wherein the update to the search space is valid for the duration of the timer and invalid when the timer expires. In some examples, to support receiving signaling indicating an update to the search space, the search space update component 930 may be configured or otherwise support elements for receiving an offset indicating the time to apply the update to the search space.

[0166] In some examples, the feedback component 945 may be configured or otherwise supported as a unit for sending confirmation of signaling indicating an update to the search space to a second UE.

[0167] In some examples, the channel measurement component 950 may be configured or otherwise supported as a unit for measuring the channel quality of the cross-link control channel. In some examples, the measurement reporting component 955 may be configured or otherwise supported as a unit for sending a measurement report to a second UE based on the channel quality of the cross-link control channel, the measurement report including interference measurements associated with at least one of a first set of multiple monitoring times, wherein the update of the search space is based on the interference measurements.

[0168] In some examples, the measurement reporting component 955 may be configured or otherwise supported for receiving indications of thresholds associated with the transmission of measurement reports, wherein the transmission of a measurement report including interference measurements associated with at least one of a first set of plurality of monitoring times is based on the interference measurement values ​​exceeding a threshold. In some examples, the measurement reporting component 955 may be configured or otherwise supported for receiving periodic transmission scheduling for measurement reports from a second UE, wherein the transmission of measurement reports is based on periodic transmission scheduling. In some examples, signaling indicating updates to the search space is received via the second part of the SCI or a sidelink data channel. In some examples, updates to the search space are applied to one or both of the forward link or reverse link.

[0169] Alternatively or additionally, according to the examples disclosed herein, the communication manager 920 may support wireless communication at the second UE. In some examples, the search space configuration component 925 may be configured or otherwise supported to include elements for identifying a configuration of a search space for the first UE, the search space including a first set of multiple monitoring moments of the sidelink control channel. In some examples, the search space update component 930 may be configured or otherwise supported to include elements for sending signaling to the first UE indicating an update to the search space associated with one or more monitoring moments of the sidelink control channel. In some examples, the SCI component 940 may be configured or otherwise supported to include elements for sending a first portion of the SCI to the first UE on a subset of a second set of multiple monitoring moments of the sidelink control channel based on the search space configuration and the update to the search space.

[0170] In some examples, to support the transmission of signaling indicating updates to the search space, the search space update component 930 may be configured or otherwise supported to include elements for transmitting indications of one or more monitoring opportunities for blocking side-link control channels from the search space, wherein the second set of multiple monitoring opportunities includes the difference between the first set of multiple monitoring opportunities and one or more monitoring opportunities. In some examples, to support the transmission of signaling indicating updates to the search space, the search space update component 930 may be configured or otherwise supported to include elements for transmitting indications of one or more monitoring opportunities for adding side-link control channels to the search space, wherein the second set of multiple monitoring opportunities includes the sum of the first set of multiple monitoring opportunities and one or more monitoring opportunities.

[0171] In some examples, to support the transmission of signaling indicating an update to the search space, the search space update component 930 may be configured or otherwise supported to support elements for transmitting indications of one or more monitoring opportunities for reactivating the side-link control channel, wherein the second set of multiple monitoring opportunities includes at least one or more monitoring opportunities. In some examples, the method further includes: transmitting to the first UE a first indication of a first search space in the search space set. In some examples, transmitting the signaling indicating an update to the search space includes: transmitting a second indication of a handover from the first search space to a second search space in the search space set.

[0172] In some examples, the first search space is associated with a first monitoring timing blocking mode, and the second search space is associated with a second monitoring timing blocking mode. In some examples, to support the transmission of signaling indicating an update to the search space, the search space update component 930 may be configured or otherwise support elements for transmitting a timer indicating a pause in the update to the search space, wherein the update to the search space is valid for the duration of the timer and invalidates upon the timer's expiration. In some examples, to support the transmission of signaling indicating an update to the search space, the search space update component 930 may be configured or otherwise support elements for transmitting an offset indicating the time at which the update to the search space should be applied.

[0173] In some examples, the feedback component 945 may be configured or otherwise supported as a unit for receiving confirmation from the first UE of signaling indicating an update to the search space.

[0174] In some examples, the measurement reporting component 955 may be configured or otherwise supported for receiving a measurement report from a first UE, the measurement report including interference measurements associated with at least one monitoring time from a first set of multiple monitoring times, wherein updates to the search space are based on the interference measurements. In some examples, the measurement reporting component 955 may be configured or otherwise supported for sending an indication of a threshold associated with the transmission of the measurement report, wherein receiving the measurement report including interference measurements associated with at least one monitoring time from the first set of multiple monitoring times is based on the interference measurements exceeding the threshold.

[0175] In some examples, the measurement reporting component 955 may be configured or otherwise support a unit for transmitting periodic transmission scheduling for measurement reports to a first UE, wherein receiving measurement reports is based on periodic transmission scheduling. In some examples, signaling indicating updates to the search space is transmitted via the second part of the SCI or a sidelink data channel. In some examples, updates to the search space are applied to one or both of the forward or reverse links.

[0176] Figure 10 A diagram of a system 1000 including a device 1005 supporting techniques for dynamically updating the search space of a sidelink control channel, according to various aspects of this disclosure, is shown. Device 1005 may be an example of device 705, device 805, or UE 115 as described herein, or a component including device 705, device 805, or UE 115. Device 1005 may wirelessly communicate with one or more base stations 105, UE 115, or any combination thereof. Device 1005 may include components for bidirectional voice and data communication, including components for transmitting and receiving communications, such as a communication manager 1020, an input / output (I / O) controller 1010, a transceiver 1015, an antenna 1025, a memory 1030, a code 1035, and a processor 1040. These components may communicate electronically or be otherwise coupled (e.g., operational ground, communication ground, functional ground, electronic ground, electrical ground) via one or more buses (e.g., bus 1045).

[0177] I / O controller 1010 can manage input and output signals for device 1005. I / O controller 1010 can also manage peripheral devices not integrated into device 1005. In some cases, I / O controller 1010 can represent a physical connection or port to an external peripheral device. In some cases, I / O controller 1010 can utilize, for example... MS- The operating system may be a known operating system. Alternatively, the I / O controller 1010 may represent or interact with a modem, keyboard, mouse, touchscreen, or similar device. In some cases, the I / O controller 1010 may be implemented as part of a processor (such as processor 1040). In some cases, a user may interact with device 1005 via the I / O controller 1010 or via hardware components controlled by the I / O controller 1010.

[0178] In some cases, device 1005 may include a single antenna 1025. However, in other cases, device 1005 may have more than one antenna 1025, which may be capable of transmitting or receiving multiple wireless transmissions simultaneously. Transceiver 1015 may communicate bidirectionally via one or more antennas 1025, wired or wireless links as described herein. For example, transceiver 1015 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. Transceiver 1015 may also include a modem for modulating packets, providing modulated packets to one or more antennas 1025 for transmission, and demodulating packets received from one or more antennas 1025. Transceiver 1015, or transceiver 1015 and one or more antennas 1025, may be an example of transmitter 715, transmitter 815, receiver 710, receiver 810, or any combination thereof or components thereof as described herein.

[0179] Memory 1030 may include random access memory (RAM) and read-only memory (ROM). Memory 1030 may store computer-readable, computer-executable code 1035, which includes instructions that, when executed by processor 1040, cause device 1005 to perform the various functions described herein. Code 1035 may be stored in a non-transitory computer-readable medium, such as system memory or another type of memory. In some cases, code 1035 may not be directly executable by processor 1040, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein. In some cases, in addition, memory 1030 may also contain a basic I / O system (BIOS) that controls basic hardware or software operations, such as interaction with peripheral components or devices.

[0180] Processor 1040 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 1040 may be configured to use a memory controller to operate a memory array. In other cases, the memory controller may be integrated into processor 1040. Processor 1040 may be configured to execute computer-readable instructions stored in memory (e.g., memory 1030) to cause device 1005 to perform various functions (e.g., functions or tasks supporting techniques for dynamically updating the search space of the sidelink control channel). For example, device 1005 or components of device 1005 may include processor 1040 and memory 1030 coupled to processor 1040, processor 1040 and memory 1030 being configured to perform the various functions described herein.

[0181] According to the examples disclosed herein, the communication manager 1020 may support wireless communication at a first UE. For example, the communication manager 1020 may be configured or otherwise supported to support elements for receiving a configuration of a search space for the first UE, the search space including a first set of multiple monitoring opportunities for the sidelink control channel. The communication manager 1020 may be configured or otherwise supported to support elements for receiving signaling from a second UE indicating an update to the search space, the update being associated with one or more monitoring opportunities for the sidelink control channel. The communication manager 1020 may be configured or otherwise supported to support elements for monitoring a second set of multiple monitoring opportunities for the sidelink control channel based on the configuration of the search space and updates to the search space. The communication manager 1020 may be configured or otherwise supported to support elements for receiving a first portion of the SCI based on monitoring.

[0182] Alternatively or additionally, according to the examples disclosed herein, the communication manager 1020 may support wireless communication at the second UE. For example, the communication manager 1020 may be configured or otherwise supported to support elements for identifying a configuration of a search space for the first UE, the search space including a first set of multiple monitoring opportunities of the sidelink control channel. The communication manager 1020 may be configured or otherwise supported to support elements for sending signaling to the first UE indicating an update to the search space, the update being associated with one or more monitoring opportunities of the sidelink control channel. The communication manager 1020 may be configured or otherwise supported to support elements for sending a first portion of the SCI to the first UE on a subset of a second set of multiple monitoring opportunities of the sidelink control channel based on the configuration of the search space and the update of the search space.

[0183] By including or configuring the communication manager 1020 according to the examples described herein, the device 1005 can support technologies for improving communication reliability, reducing latency, improving and reducing user experience related to processing, reducing power consumption, utilizing communication resources more efficiently, improving coordination between devices, extending battery life, and improving the utilization of processing power.

[0184] In some examples, the communication manager 1020 may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or in cooperation with transceiver 1015, one or more antennas 1025, or any combination thereof. Although the communication manager 1020 is shown as a separate component, in some examples, one or more functions described with reference to the communication manager 1020 may be supported or executed by processor 1040, memory 1030, code 1035, or any combination thereof. For example, code 1035 may include instructions executable by processor 1040 to cause device 1005 to perform aspects of techniques described herein for dynamically updating the search space of the side link control channel, or processor 1040 and memory 1030 may be otherwise configured to perform or support such operations.

[0185] Figure 11 A flowchart illustrating a method 1100 for dynamically updating the search space of a sidelink control channel, according to various aspects of this disclosure, is shown. Operation of method 1100 can be implemented by a UE or its components as described herein. For example, operation of method 1100 can be implemented by, as described in reference... Figures 1 to 10 The UE 115 described is used to perform this function. In some examples, the UE can execute a set of instructions to control the functional elements of the UE to perform the described function. Alternatively, the UE can use dedicated hardware to perform aspects of the described function.

[0186] At 1105, the method may include: receiving a configuration for a search space for a first UE, the search space including a first set of multiple monitoring opportunities for the side link control channel. The operation at 1105 can be performed according to examples as disclosed herein. In some examples, aspects of the operation at 1105 may be provided by reference to... Figure 9 The search space configuration component 925 is described and executed.

[0187] At 1110, the method may include: receiving from a second UE signaling an update to the search space, the update being associated with one or more monitoring events of the side link control channel. The operation of 1110 can be performed according to examples as disclosed herein. In some examples, aspects of the operation of 1110 may be determined by reference to... Figure 9 The search space update component 930 is described and executed.

[0188] At 1115, the method may include: a second set of multiple monitoring opportunities for the side-link control channel based on the configuration of the search space and updates to the search space. The operation at 1115 can be performed according to examples disclosed herein. In some examples, aspects of the operation at 1115 may be determined by reference to... Figure 9 The monitoring component 935 described is used to perform this.

[0189] At 1120, the method may include: receiving a first portion of the SCI based on monitoring. The operation at 1120 can be performed according to examples as disclosed herein. In some examples, aspects of the operation at 1120 may be derived from, as referenced... Figure 9 The SCI component 940 is described for execution.

[0190] Figure 12 A flowchart illustrating a method 1200 for dynamically updating the search space of a sidelink control channel, according to various aspects of this disclosure, is shown. Operation of method 1200 can be implemented by a UE or its components as described herein. For example, operation of method 1200 can be implemented by, as described in reference... Figures 1 to 10 The UE 115 described is used to perform this function. In some examples, the UE can execute a set of instructions to control the functional elements of the UE to perform the described function. Alternatively, the UE can use dedicated hardware to perform aspects of the described function.

[0191] At 1205, the method may include: receiving a configuration for a search space for a first UE, the search space including a first set of multiple monitoring opportunities for the side link control channel. The operation at 1205 can be performed according to examples as disclosed herein. In some examples, aspects of the operation at 1205 may be provided by reference to... Figure 9 The search space configuration component 925 is described and executed.

[0192] At 1210, the method may include: measuring the channel quality of the side link control channel. The operation of 1210 can be performed according to examples as disclosed herein. In some examples, aspects of the operation of 1210 may be derived from, as referenced... Figure 9 The described channel measurement component 950 is used to perform this.

[0193] At 1215, the method may include: sending a measurement report to a second UE based on the channel quality of the measurement-side link control channel, the measurement report including interference measurements associated with at least one monitoring opportunity from a first set of multiple monitoring opportunities. The operation of 1215 can be performed according to examples as disclosed herein. In some examples, aspects of the operation of 1215 may be derived from references... Figure 9 The measurement report component 955 is described to perform this.

[0194] At 1220, the method may include: receiving from a second UE a signaling indication of an update to the search space, the update being associated with one or more monitoring events of the side link control channel. The operation at 1220 can be performed according to examples as disclosed herein. In some examples, aspects of the operation at 1220 may be determined by reference to... Figure 9 The search space update component 930 is described and executed.

[0195] At 1225, the method may include: a second set of multiple monitoring opportunities for the side-link control channel based on the configuration of the search space and updates to the search space. The operation at 1225 can be performed according to examples disclosed herein. In some examples, aspects of the operation at 1225 may be determined by reference to... Figure 9 The monitoring component 935 described is used to perform this.

[0196] At 1230, the method may include: receiving a first portion of the SCI based on monitoring. The operation at 1230 can be performed according to examples disclosed herein. In some examples, aspects of the operation at 1230 may be derived from, as referenced... Figure 9 The SCI component 940 is described for execution.

[0197] Figure 13 A flowchart illustrating a method 1300 for dynamically updating the search space of a sidelink control channel, according to various aspects of this disclosure, is shown. Operation of method 1300 can be implemented by a UE or its components as described herein. For example, operation of method 1300 can be implemented by, as described in reference... Figures 1 to 10 The UE 115 described is used to perform this function. In some examples, the UE can execute a set of instructions to control the functional elements of the UE to perform the described function. Alternatively, the UE can use dedicated hardware to perform aspects of the described function.

[0198] At 1305, the method may include: identifying a configuration of a search space for a first UE, the search space including a first set of multiple monitoring opportunities of the side link control channel. The operation at 1305 can be performed according to examples as disclosed herein. In some examples, aspects of the operation at 1305 may be derived from references... Figure 9 The search space configuration component 925 is described and executed.

[0199] At 1310, the method may include: sending a signaling to a first UE indicating an update to the search space, the update being associated with one or more monitoring events of the side link control channel. The operation of 1310 can be performed according to examples as disclosed herein. In some examples, aspects of the operation of 1310 may be derived from references... Figure 9The search space update component 930 is described and executed.

[0200] At 1315, the method may include: transmitting a first portion of the SCI to the first UE on a subset of a second set of multiple monitoring opportunities of the side link control channel based on the configuration of the search space and updates to the search space. The operation at 1315 can be performed according to examples as disclosed herein. In some examples, aspects of the operation at 1315 may be determined by reference to... Figure 9 The SCI component 940 is described for execution.

[0201] Figure 14 A flowchart illustrating a method 1400 for dynamically updating the search space of a sidelink control channel, according to various aspects of this disclosure, is shown. Operation of method 1400 can be implemented by a UE or its components as described herein. For example, operation of method 1400 can be implemented by, as referred to... Figures 1 to 10 The UE 115 described is used to perform this function. In some examples, the UE can execute a set of instructions to control the functional elements of the UE to perform the described function. Alternatively, the UE can use dedicated hardware to perform aspects of the described function.

[0202] At 1405, the method may include: identifying a configuration of a search space for a first UE, the search space including a first set of multiple monitoring opportunities of the side link control channel. The operation at 1405 can be performed according to examples as disclosed herein. In some examples, aspects of the operation at 1405 may be determined by reference to... Figure 9 The search space configuration component 925 is described and executed.

[0203] At 1410, the method may include: receiving a measurement report from a first UE, the measurement report including interference measurements associated with at least one monitoring time from a first set of multiple monitoring times. Operation 1410 may be performed according to examples as disclosed herein. In some examples, aspects of operation 1410 may be provided by reference to... Figure 9 The measurement report component 955 is described to perform this.

[0204] At 1415, the method may include: sending a signaling to a first UE indicating an update to the search space, the update being associated with one or more monitoring events of the side link control channel. The operation at 1415 can be performed according to examples as disclosed herein. In some examples, aspects of the operation at 1415 may be determined by reference to... Figure 9 The search space update component 930 is described and executed.

[0205] At 1420, the method may include: transmitting a first portion of the SCI to the first UE on a subset of a second set of multiple monitoring opportunities of the side link control channel based on the configuration of the search space and updates to the search space. The operation at 1420 can be performed according to examples as disclosed herein. In some examples, aspects of the operation at 1420 may be determined by reference to... Figure 9 The SCI component 940 is described for execution.

[0206] The following provides a summary of various aspects of this disclosure:

[0207] Aspect 1: A method for wireless communication at a first UE, comprising: receiving a configuration of a search space for the first UE, the search space including a first plurality of monitoring opportunities of a sidelink control channel; receiving from a second UE signaling indicating an update to the search space, the update being associated with one or more monitoring opportunities of the sidelink control channel; monitoring a second plurality of monitoring opportunities of the sidelink control channel at least in part based on the configuration of the search space and the update to the search space; and receiving a first portion of a SCI at least in part based on the monitoring.

[0208] Aspect 2: According to the method of aspect 1, wherein receiving the signaling indicating the update of the search space includes: receiving an indication of one or more monitoring opportunities that block the side link control channel from the search space, wherein the second plurality of monitoring opportunities includes the difference between the first plurality of monitoring opportunities and the one or more monitoring opportunities.

[0209] Aspect 3: The method according to any one of Aspects 1 to 2, wherein receiving the signaling indicating the update of the search space comprises: receiving an indication of one or more monitoring opportunities for adding the side link control channel to the search space, wherein the second plurality of monitoring opportunities comprises the sum of the first plurality of monitoring opportunities and the one or more monitoring opportunities.

[0210] Aspect 4: The method according to any one of Aspects 1 to 3, wherein receiving the signaling indicating the update of the search space comprises: receiving an indication of the one or more monitoring opportunities to reactivate the side link control channel, wherein the second plurality of monitoring opportunities includes at least the one or more monitoring opportunities.

[0211] Aspect 5: According to the method of aspect 1, wherein the first UE is configured with a search space set including at least two search spaces, and wherein receiving the configuration of the search spaces includes: receiving a first indication to a first search space in the search space set, and receiving the signaling indicating the update of the search space includes: receiving a second indication to switch from the first search space to a second search space in the search space set.

[0212] Aspect 6: According to the method of aspect 5, wherein the first search space is associated with a first monitoring timing blocking mode, and the second search space is associated with a second monitoring timing blocking mode.

[0213] Aspect 7: The method according to any one of Aspects 1 to 6, wherein receiving the signaling indicating the update of the search space comprises: receiving a timer indicating a pause of the update of the search space, wherein the update of the search space is valid for the duration of the timer and invalid when the timer expires.

[0214] Aspect 8: The method according to any one of Aspects 1 to 7, wherein receiving the signaling indicating the update of the search space comprises: receiving an offset of the time indicating the application of the update to the search space.

[0215] Aspect 9: The method according to any one of aspects 1 to 8 further includes: sending an acknowledgment to the second UE of the signaling indicating the update of the search space.

[0216] Aspect 10: The method according to any one of Aspects 1 to 9 further includes: measuring the channel quality of the side link control channel; and sending a measurement report to the second UE based at least in part on the measurement of the channel quality of the side link control channel, the measurement report including interference measurements associated with at least one of the first plurality of monitoring times, wherein the update of the search space is based at least in part on the interference measurements.

[0217] Aspect 11: The method according to aspect 10 further includes: receiving an indication of a threshold associated with the transmission of the measurement report, wherein transmitting the measurement report, which includes the interference measurement value associated with at least one of the first plurality of monitoring times, is based at least in part on the interference measurement value exceeding the threshold.

[0218] Aspect 12: The method according to any one of Aspects 10 to 11 further includes: receiving from the second UE a periodic transmission schedule for the measurement report, wherein sending the measurement report is at least partially based on the periodic transmission schedule.

[0219] Aspect 13: The method according to any one of Aspects 1 to 12, wherein the signaling indicating the update of the search space is received via the second part of the SCI or the side link data channel.

[0220] Aspect 14: The method according to any one of Aspects 1 to 13, wherein the update of the search space is applied to one or both of the forward link or the reverse link.

[0221] Aspect 15: A method for wireless communication at a second UE, comprising: identifying a configuration of a search space for a first UE, the search space including a first plurality of monitoring times of a sidelink control channel; sending to the first UE a signaling indicating an update to the search space, the update being associated with one or more monitoring times of the sidelink control channel; and sending a first portion of a SCI to the first UE on a subset of a second plurality of monitoring times of the sidelink control channel, based at least in part on the configuration of the search space and the update to the search space.

[0222] Aspect 16: According to the method of aspect 15, wherein sending the signaling indicating the update of the search space includes: sending an indication of one or more monitoring opportunities that block the side link control channel from the search space, wherein the second plurality of monitoring opportunities includes the difference between the first plurality of monitoring opportunities and the one or more monitoring opportunities.

[0223] Aspect 17: The method according to any one of Aspects 15 to 16, wherein sending the signaling indicating the update of the search space comprises: sending an indication of the one or more monitoring opportunities for adding the side link control channel to the search space, wherein the second plurality of monitoring opportunities comprises the sum of the first plurality of monitoring opportunities and the one or more monitoring opportunities.

[0224] Aspect 18: The method according to any one of Aspects 15 to 17, wherein sending the signaling indicating the update of the search space comprises: sending an indication of the one or more monitoring opportunities to reactivate the side link control channel, wherein the second plurality of monitoring opportunities includes at least the one or more monitoring opportunities.

[0225] Aspect 19: The method according to aspect 15, wherein the first UE is configured with a search space set including at least two search spaces, and wherein the method further includes: sending a first indication to the first UE for a first search space in the search space set, and sending the signaling indicating the update of the search space includes: sending a second indication for a switch from the first search space to a second search space in the search space set.

[0226] Aspect 20: The method according to aspect 19, wherein the first search space is associated with a first monitoring timing blocking mode, and the second search space is associated with a second monitoring timing blocking mode.

[0227] Aspect 21: The method according to any one of Aspects 15 to 20, wherein sending the signaling indicating the update of the search space comprises: sending a timer indicating a pause of the update of the search space, wherein the update of the search space is valid for the duration of the timer and invalid when the timer expires.

[0228] Aspect 22: The method according to any one of aspects 15 to 21, wherein sending the signaling indicating the update of the search space comprises: sending an offset of the time indicating that the update of the search space should be applied.

[0229] Aspect 23: The method according to any one of aspects 15 to 22 further includes: receiving from the first UE an acknowledgment of the signaling indicating the update of the search space.

[0230] Aspect 24: The method according to any one of Aspects 15 to 23 further includes: receiving a measurement report from the first UE, the measurement report including interference measurements associated with at least one of the first plurality of monitoring times, wherein the update of the search space is at least partially based on the interference measurements.

[0231] Aspect 25: The method according to aspect 24 further includes: sending an indication of a threshold associated with the transmission of the measurement report, wherein receiving the measurement report, which includes the interference measurement value associated with at least one of the first plurality of monitoring times, is based at least in part on the interference measurement value exceeding the threshold.

[0232] Aspect 26: The method according to any one of Aspects 24 to 25 further includes: sending a periodic transmission schedule for the measurement report to the first UE, wherein receiving the measurement report is at least partially based on the periodic transmission schedule.

[0233] Aspect 27: The method according to any one of Aspects 15 to 26, wherein the signaling indicating the update of the search space is transmitted via the second part of the SCI or the side link data channel.

[0234] Aspect 28: The method according to any one of Aspects 15 to 27, wherein the update of the search space is applied to one or both of the forward link or the reverse link.

[0235] Aspect 29: 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 of any one of Aspects 1 to 14.

[0236] Aspect 30: An apparatus for wireless communication at a first UE, comprising at least one unit for performing the method of any one of aspects 1 to 14.

[0237] Aspect 31: 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 methods of any one of Aspects 1 to 14.

[0238] Aspect 32: An apparatus for wireless communication at a second 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 of any one of Aspects 15 to 28.

[0239] Aspect 33: An apparatus for wireless communication at a second UE, comprising at least one unit for performing the method of any one of aspects 15 to 28.

[0240] Aspect 34: A non-transitory computer-readable medium storing code for wireless communication at a second UE, the code comprising instructions executable by a processor to perform the methods of any one of Aspects 15 to 28.

[0241] 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.

[0242] 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.

[0243] 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.

[0244] 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 DSP and a microprocessor, multiple microprocessors, one or more microprocessors combined with a DSP core, or any other such configuration).

[0245] 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 on or transmitted via a computer-readable medium as one or more instructions or code. 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.

[0246] Computer-readable media includes both non-transitory computer storage media and communication media, with communication media encompassing any medium that facilitates the transfer of a computer program 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 program code units 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 combination described above is also included within the scope of computer-readable media.

[0247] 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 manner as the phrase "at least partially based on".

[0248] 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.

[0249] 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.

[0250] 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 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 configuration of a search space for the first UE from a network device or a second UE, the search space including a first plurality of monitoring opportunities of the side link control channel; The second UE receives signaling from the sidelink data channel indicating an update to the search space, the update being associated with one or more monitoring events of the sidelink control channel; The second plurality of monitoring opportunities for the side link control channel are monitored at least in part based on the configuration of the search space and the updates to the search space; as well as The first part of the side link control information received from the second UE is based at least in part on the monitoring.

2. The method of claim 1, wherein, Receiving the signaling indicating the update to the search space includes: Receive indications for one or more monitoring opportunities that block the side link control channel from the search space, wherein the second plurality of monitoring opportunities includes the difference between the first plurality of monitoring opportunities and the one or more monitoring opportunities.

3. The method of claim 1, wherein, Receiving the signaling indicating the update to the search space includes: Receive an indication of one or more monitoring opportunities to add the sidelink control channel to the search space, wherein the second plurality of monitoring opportunities includes the sum of the first plurality of monitoring opportunities and the one or more monitoring opportunities.

4. The method of claim 1, wherein, Receiving the signaling indicating the update to the search space includes: Receive an indication for one or more monitoring opportunities to reactivate the side link control channel, wherein the second plurality of monitoring opportunities includes at least the one or more monitoring opportunities.

5. The method of claim 1, wherein, The first UE is configured with a search space set including at least two search spaces, wherein: The configuration for receiving the search space includes: receiving a first indication of a first search space in the set of search spaces; and Receiving the signaling indicating the update of the search space includes: receiving a second indication of switching from the first search space to a second search space in the set of search spaces.

6. The method of claim 5, wherein, The first search space is associated with the first monitoring timing blocking mode, and the second search space is associated with the second monitoring timing blocking mode.

7. The method of claim 1, wherein, Receiving the signaling indicating the update to the search space includes: Receive a timer indicating a pause for the update of the search space, wherein the update of the search space is valid for the duration of the timer and invalid when the timer expires.

8. The method according to claim 1, wherein, Receiving the signaling indicating the update to the search space includes: The system receives an instruction to apply the time offset of the update to the search space.

9. The method according to claim 1, further comprising: Send an acknowledgment to the second UE of the signaling indicating the update of the search space.

10. The method according to claim 1, further comprising: Measure the channel quality of the side link control channel; as well as A measurement report is sent to the second UE based at least in part on the channel quality of the sidelink control channel, the measurement report including interference measurements associated with at least one of the first plurality of monitoring times, wherein the update of the search space is based at least in part on the interference measurements.

11. The method of claim 10, further comprising: Receive an indication of a threshold associated with the transmission of the measurement report, wherein the transmission of the measurement report, which includes the interference measurement value associated with at least one of the first plurality of monitoring times, is based at least in part on the interference measurement value exceeding the threshold.

12. The method of claim 10, further comprising: The second UE receives a periodic transmission schedule for the measurement report, wherein sending the measurement report is at least partially based on the periodic transmission schedule.

13. The method according to claim 1, wherein, The signaling indicating the update of the search space is received via the second part of the side link control information.

14. The method according to claim 1, wherein, The update to the search space is applied to one or both of the forward or reverse links.

15. A method for wireless communication at a second user equipment (UE), comprising: Identify the configuration of the search space for the first UE, the search space including the first plurality of monitoring opportunities of the side link control channel; The signaling indicating an update to the search space is sent to the first UE via the sidelink data channel, the update being associated with one or more monitoring events of the sidelink control channel; as well as The first portion of the sidelink control information is sent to the first UE at least in part based on the configuration of the search space and the update of the search space on a subset of the second plurality of monitoring times of the sidelink control channel.

16. The method according to claim 15, wherein, Sending the signaling indicating the update to the search space includes: Sending indications for one or more monitoring opportunities that block the side link control channel from the search space, wherein the second plurality of monitoring opportunities includes the difference between the first plurality of monitoring opportunities and the one or more monitoring opportunities.

17. The method according to claim 15, wherein, Sending the signaling indicating the update to the search space includes: Sending an indication for one or more monitoring opportunities to add the side link control channel to the search space, wherein the second plurality of monitoring opportunities includes the sum of the first plurality of monitoring opportunities and the one or more monitoring opportunities.

18. The method according to claim 15, wherein, Sending the signaling indicating the update to the search space includes: Sending an indication for the one or more monitoring opportunities to reactivate the side link control channel, wherein the second plurality of monitoring opportunities includes at least the one or more monitoring opportunities.

19. The method according to claim 15, wherein, The first UE is configured with a search space set including at least two search spaces, wherein: The method further includes: sending a first indication to the first UE of a first search space in the search space set; and The signaling that indicates the update of the search space includes sending a second indication of switching from the first search space to a second search space in the set of search spaces.

20. The method according to claim 19, wherein, The first search space is associated with the first monitoring timing blocking mode, and the second search space is associated with the second monitoring timing blocking mode.

21. The method according to claim 15, wherein, Sending the signaling indicating the update to the search space includes: Send a timer indicating a pause for the updates to the search space, wherein the updates to the search space are valid for the duration of the timer and invalid when the timer expires.

22. The method according to claim 15, wherein, Sending the signaling indicating the update to the search space includes: Send an instruction to apply the time offset of the update to the search space.

23. The method of claim 15, further comprising: The first UE receives an acknowledgment of the signaling indicating the update of the search space.

24. The method of claim 15, further comprising: A measurement report is received from the first UE, the measurement report including interference measurements associated with at least one of the first plurality of monitoring times, wherein the update of the search space is at least partially based on the interference measurements.

25. The method of claim 24, further comprising: Sending an indication of a threshold associated with the transmission of the measurement report, wherein receiving the measurement report, which includes the interference measurement value associated with at least one of the first plurality of monitoring times, is at least in part based on the interference measurement value exceeding the threshold.

26. The method of claim 24, further comprising: A periodic transmission schedule for the measurement report is sent to the first UE, wherein receiving the measurement report is at least partially based on the periodic transmission schedule.

27. The method according to claim 15, wherein, The signaling indicating the update of the search space is sent via the second part of the side link control information.

28. The method according to claim 15, wherein, The update to the search space is applied to one or both of the forward or reverse links.

29. 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 executable by the processor, cause the device to perform the following operations: Receive configuration of a search space for the first UE from a network device or a second UE, the search space including a first plurality of monitoring opportunities of the side link control channel; The second UE receives signaling from the sidelink data channel indicating an update to the search space, the update being associated with one or more monitoring events of the sidelink control channel; The second plurality of monitoring opportunities for the side link control channel are monitored at least in part based on the configuration of the search space and the updates to the search space; as well as The first part of the side link control information received from the second UE is based at least in part on the monitoring.

30. The apparatus according to claim 29, wherein, The instructions are also executable by the processor to cause the device to perform the method according to any one of claims 2 to 14.

31. An apparatus for wireless communication at a second user equipment (UE), comprising: processor; Memory coupled to the processor; as well as Instructions, which are stored in the memory and executable by the processor, cause the device to perform the following operations: Identify the configuration of the search space for the first UE, the search space including the first plurality of monitoring opportunities of the side link control channel; The signaling indicating an update to the search space is sent to the first UE via the sidelink data channel, the update being associated with one or more monitoring events of the sidelink control channel; as well as The first portion of the sidelink control information is sent to the first UE at least in part based on the configuration of the search space and the update of the search space on a subset of the second plurality of monitoring times of the sidelink control channel.

32. The apparatus according to claim 31, wherein, The instructions are also executable by the processor to cause the device to perform the method according to any one of claims 16 to 28.

33. 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 following operations: Receive configuration of a search space for the first UE from a network device or a second UE, the search space including a first plurality of monitoring opportunities of the side link control channel; The second UE receives signaling from the sidelink data channel indicating an update to the search space, the update being associated with one or more monitoring events of the sidelink control channel; The second plurality of monitoring opportunities for the side link control channel are monitored at least in part based on the configuration of the search space and the updates to the search space; as well as The first part of the side link control information received from the second UE is based at least in part on the monitoring.

34. The non-transitory computer-readable medium according to claim 33, wherein, The code also includes instructions executable by the processor to perform the method according to any one of claims 2 to 14.

35. A non-transitory computer-readable medium storing code for wireless communication at a second UE, the code comprising instructions executable by a processor to perform the following operations: Identify the configuration of the search space for the first UE, the search space including the first plurality of monitoring opportunities of the side link control channel; Sending signaling indicating an update to the search space to the first UE via a sidelink data channel, the update being associated with one or more monitoring events of the sidelink control channel; and The first portion of the sidelink control information is sent to the first UE at least in part based on the configuration of the search space and the update of the search space on a subset of the second plurality of monitoring times of the sidelink control channel.

36. The non-transitory computer-readable medium according to claim 35, wherein, The code also includes instructions executable by the processor to perform the method according to any one of claims 16 to 28.

37. An apparatus for wireless communication at a first UE, comprising: A unit for receiving configuration of a search space for the first UE from a network device or a second UE, the search space including a first plurality of monitoring opportunities of the side link control channel; A unit for receiving signaling from the second UE via a sidelink data channel indicating an update to the search space, the update being associated with one or more monitoring events of the sidelink control channel; A unit for monitoring a second plurality of monitoring opportunities of the side link control channel based at least in part on the configuration of the search space and the updates to the search space; as well as A unit for receiving a first portion of side link control information from the second UE based at least in part on the monitoring.

38. The apparatus of claim 37, further comprising a unit for performing the method according to any one of claims 2 to 14.

39. An apparatus for wireless communication at a second UE, comprising: A unit for identifying the configuration of a search space for a first UE, the search space including a first plurality of monitoring opportunities of the side link control channel; A unit for sending signaling indicating an update to the search space to the first UE via a sidelink data channel, the update being associated with one or more monitoring events of the sidelink control channel; as well as A unit for transmitting a first portion of the sidelink control information to the first UE on a second subset of multiple monitoring times of the sidelink control channel, based at least in part on the configuration of the search space and the updates to the search space.

40. The apparatus of claim 39, further comprising a unit for performing the method of any one of claims 16 to 28.

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