Sidelink interference monitoring for full duplex and half duplex operation

Abstract

Methods, systems, and devices are described for wireless communication. Generally, techniques described at a user equipment (UE) provide efficient fallback from full duplex mode to half duplex mode when interference levels are high. In particular, a UE can measure an interference level at the UE (e.g., caused at least in part by self-interference between transmission and reception at the UE), and if the interference level is above a threshold, the UE can fallback to half duplex mode. In one example, the UE can transmit a channel state information (CSI) reference signal (CSI-RS) on resources allocated for interference measurement, and the UE can perform measurements on the CSI-RS to identify the interference level. In another example, the UE can transmit a data packet on resources allocated for interference measurement, and the UE can decode the data packet to identify the interference level.

Description

Technical Field

[0001] The following relates generally to wireless communications and, more particularly, to managing interference for sidelink communications. Background Art

[0002] Wireless communication systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, etc. These systems may be able to support communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multiple access systems include fourth generation (4G) systems (such as long term evolution (LTE) systems, 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 spread 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 for multiple communication devices (which may also be referred to as user equipment (UE)). Summary of the Invention

[0003] A method for wireless communication at a UE is described. The method may include transmitting on resources allocated for interference measurement at the UE, wherein the UE is operating in full-duplex mode for sidelink communication; determining, based on the transmitting, that an interference level between transmission and reception at the UE satisfies an interference threshold; and switching to half-duplex mode for sidelink communication based on the determining.

[0004] An apparatus for wireless communication at a UE is described. The apparatus may include a processor and a memory coupled to the processor. The processor and memory may be configured to: transmit on resources allocated for interference measurement at the UE, wherein the UE is operating in full-duplex mode for sidelink communication; determine, based on the transmission, that an interference level between transmission and reception at the UE satisfies an interference threshold; and switch to half-duplex mode for sidelink communication based on the determination.

[0005] Another apparatus for wireless communication at a UE is described. The apparatus may include means for transmitting on resources allocated for interference measurement at the UE, wherein the UE is operating in full-duplex mode for sidelink communication; determining, based on the transmitting, that an interference level between transmission and reception at the UE satisfies an interference threshold; and switching to half-duplex mode for sidelink communication based on the determining.

[0006] A non-transitory computer-readable medium storing code for wireless communication at a UE is described. The code may include instructions executable by a processor to: transmit on resources allocated for interference measurement at the UE, wherein the UE is operating in full-duplex mode for sidelink communication; determine, based on the transmission, that an interference level between transmission and reception at the UE satisfies an interference threshold; and switch to half-duplex mode for sidelink communication based on the determination.

[0007] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, transmitting on the resources allocated for interference measurement may include operations, features, means, or instructions for transmitting a channel state information reference signal on the resources allocated for interference measurement, wherein the interference measurement includes a channel state information interference measurement. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, means, or instructions for performing at least one measurement on the resources allocated for interference measurement, wherein determining that the interference level satisfies the interference threshold may be based on performing the at least one measurement.

[0008] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for comparing the at least one measurement to the interference threshold, wherein determining that the interference level satisfies the interference threshold comprises determining that the at least one measurement satisfies the interference threshold (e.g., or fails to satisfies the interference threshold). Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for mapping the at least one measurement to a block error rate and comparing the block error rate to the interference threshold, wherein determining that the interference level satisfies the interference threshold comprises determining that the block error rate satisfies the interference threshold.

[0009] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, transmitting on the resources allocated for interference measurement may include operations, features, means, or instructions for transmitting a data packet on the resources allocated for interference measurement. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may also include operations, features, means, or instructions for decoding the data packet, wherein determining that the interference level satisfies the interference threshold may be based on decoding the data packet.

[0010] 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 operations: whenever the UE determines that the interference level between transmission and reception at the UE satisfies the interference threshold, sending an out-of-sync indication from a lower layer at the UE to an upper layer at the UE. 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 operations: switching to the half-duplex mode for the sidelink communication may be based on the upper layer at the UE receiving a threshold number of consecutive out-of-sync indications.

[0011] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for: whenever the UE determines that the interference level between transmission and reception at the UE fails to meet the interference threshold, sending a synchronization indication from a lower layer at the UE to an upper layer at the UE. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for: based on the upper layer at the UE receiving a threshold number of consecutive synchronization indications, switching back to the full-duplex mode for the sidelink communication.

[0012] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the UE may include operations, features, units, or instructions for performing the following operations: after switching to the half-duplex mode, sending an indication to a second UE that the first UE may be operating in the half-duplex mode for sidelink communication. In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the UE may include operations, features, units, or instructions for performing the following operations: receiving an indication from a second UE whether the second UE may be operating in the full-duplex mode or the half-duplex mode for sidelink communication; and scheduling sidelink communication with the second UE based on whether the second UE may be operating in the full-duplex mode or the half-duplex mode.

[0013] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the UE may include operations, features, units, or instructions for: sending an indication of a time slot pattern used by the first UE for sidelink communication to a second UE. In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the UE may include operations, features, units, or instructions for: receiving an indication of a time slot pattern used by the second UE for sidelink communication from a second UE; and scheduling sidelink communication with the second UE based on the time slot pattern used by the second UE for sidelink communication.

[0014] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following operations: sending a request to a base station to operate in the half-duplex mode based on the interference level satisfying the interference threshold; and receiving a reconfiguration message from the base station to configure the UE to operate in the half-duplex mode, wherein falling back to the half-duplex mode for sidelink communication may be based on receiving the reconfiguration message. In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the UE may include operations, features, units, or instructions for performing the following operations: forwarding a channel state information report received from a second UE to a base station; and receiving an indication from the base station of whether to operate in the full-duplex mode or the half-duplex mode for sidelink communication based on forwarding the channel state information report.

[0015] Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, units, or instructions for: receiving a control message from a base station indicating the resources allocated for interference measurement. In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, the resources allocated for interference measurement may be periodic. Some examples of the methods, apparatuses, and non-transitory computer-readable media described herein may further include operations, features, units, or instructions for: operating in full-duplex mode includes transmitting and receiving simultaneously on the same set of time and frequency resources, and wherein operating in half-duplex mode includes transmitting or receiving on the set of time and frequency resources.

[0016] A method of wireless communication at a base station is described. The method may include sending a control message to a first UE indicating resources allocated for interference measurement; identifying whether the first UE is operating in a full-duplex mode or a half-duplex mode for sidelink communication based on sending the control message; and scheduling sidelink communication between the first UE and a second UE based on the identification.

[0017] An apparatus for wireless communication at a base station is described. The apparatus may include a processor and a memory coupled to the processor. The processor and the memory may be configured to: send a control message to a first UE indicating resources allocated for interference measurement; identify, based on sending the control message, whether the first UE is operating in a full-duplex mode or a half-duplex mode for sidelink communication; and schedule sidelink communication between the first UE and a second UE based on the identification.

[0018] Another apparatus for wireless communication at a base station is described. The apparatus may include means for sending a control message to a first UE indicating resources allocated for interference measurement; identifying whether the first UE is operating in a full-duplex mode or a half-duplex mode for sidelink communication based on sending the control message; and scheduling sidelink communication between the first UE and a second UE based on the identification.

[0019] A non-transitory computer-readable medium storing code for wireless communication at a base station is described. The code may include instructions executable by a processor to: send a control message to a first UE indicating resources allocated for interference measurement; identify, based on sending the control message, whether the first UE is operating in a full-duplex mode or a half-duplex mode for sidelink communication; and schedule sidelink communication between the first UE and a second UE based on the identification.

[0020] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following operations: receiving a request from the first UE to operate in full-duplex mode or half-duplex mode; and sending a reconfiguration message to the first UE to configure the UE to operate in the full-duplex mode or the half-duplex mode, wherein identifying that the first UE may be operating in the full-duplex mode or the half-duplex mode for sidelink communication may be based on sending the reconfiguration message. Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, units, or instructions for performing the following operations: receiving a channel state information report forwarded from the second UE from the first UE; and sending an indication to the first UE of operating in the full-duplex mode or the half-duplex mode for sidelink communication based on the channel state information report, wherein identifying that the first UE may be operating in the full-duplex mode or the half-duplex mode for sidelink communication may be based on sending the indication. In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the resources allocated for interference measurement may be periodic. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 An example of a wireless communication system supporting sidelink interference monitoring for full-duplex and half-duplex operations in accordance with aspects of the present disclosure is shown.

[0022] Figure 2 and 3 An example of a process flow illustrating scheduling of sidelink communications is shown in accordance with aspects of the present disclosure.

[0023] Figure 4 An example of a vehicle supporting sidelink communication according to aspects of the present disclosure is shown.

[0024] Figure 5 An example of a wireless communication system supporting sidelink interference monitoring for full-duplex and half-duplex operations in accordance with aspects of the present disclosure is shown.

[0025] Figure 6 An example of a process flow supporting sidelink interference monitoring for full-duplex and half-duplex operations in accordance with aspects of the present disclosure is shown.

[0026] Figure 7 and 8 A block diagram of a device supporting sidelink interference monitoring for full-duplex and half-duplex operations is shown in accordance with aspects of the present disclosure.

[0027] Figure 9A block diagram of a communications manager supporting sidelink interference monitoring for full-duplex and half-duplex operations is shown in accordance with aspects of the present disclosure.

[0028] Figure 10 A schematic diagram of a system including devices supporting sidelink interference monitoring for full-duplex and half-duplex operations is shown in accordance with aspects of the present disclosure.

[0029] Figure 11 and 12 A block diagram of a device supporting sidelink interference monitoring for full-duplex and half-duplex operations is shown in accordance with aspects of the present disclosure.

[0030] Figure 13 A block diagram of a communications manager supporting sidelink interference monitoring for full-duplex and half-duplex operations is shown in accordance with aspects of the present disclosure.

[0031] Figure 14 A schematic diagram of a system including devices supporting sidelink interference monitoring for full-duplex and half-duplex operations is shown in accordance with aspects of the present disclosure.

[0032] Figure 15 and 16 A flow chart illustrating a method of supporting sidelink interference monitoring for full-duplex and half-duplex operations in accordance with aspects of the present disclosure is shown. DETAILED DESCRIPTION

[0033] Some wireless communication systems may support sidelink communication between UEs. A UE that supports sidelink communication may be referred to as a sidelink UE. In such a system, a sidelink UE may have the ability to communicate in half-duplex mode and full-duplex mode. Half-duplex mode may support unidirectional communication via transmission or reception, but does not support simultaneous transmission and reception. Alternatively, full-duplex mode may support bidirectional communication via simultaneous transmission and reception on the same time-frequency resource. In some cases, when communicating in full-duplex mode, a sidelink UE may experience self-interference. Self-interference may refer to interference between a transmission from a UE and a reception at the UE (e.g., between a transmitted signal and a received signal). In such a case, if the self-interference is higher than a threshold, the UE may not be able to decode the sidelink data received from other UEs or the downlink data received from the base station, thereby resulting in reduced throughput in the wireless communication system.

[0034] As described herein, a UE may support efficient techniques for falling back from full-duplex mode to half-duplex mode when interference levels are high. In particular, the UE may measure an interference level at the UE (e.g., caused at least in part by self-interference between transmission and reception at the UE), and if the interference level is above a threshold, the UE may fall back to half-duplex mode. In one example, the UE may send a channel state information (CSI) reference signal (CSI-RS) on resources allocated for interference measurement, and the UE may perform measurements on the CSI-RS. The UE may then identify the interference level based on the measurements performed on the resources allocated for interference measurement. In another example, the UE may send a data packet on the resources allocated for interference measurement, and the UE may decode the data packet to identify the interference level.

[0035] The following describes various aspects of the present disclosure introduced above in the context of a wireless communication system. Examples of processes and signaling exchanges that support sidelink interference monitoring for full-duplex and half-duplex operation are then described. Aspects of the present disclosure are further illustrated by, and described with reference to, apparatus diagrams, system diagrams, and flow diagrams related to sidelink interference monitoring for full-duplex and half-duplex operation.

[0036] Figure 1 An example of a wireless communication system 100 that supports sidelink interference monitoring for full-duplex and half-duplex operations in accordance with aspects of the present disclosure is shown. The wireless communication system 100 may include one or more base stations 105, one or more UEs 115, and a core network 130. In some examples, the wireless communication system 100 may be an LTE network, an LTE-A network, an LTE-A Pro network, or a New Radio (NR) network. In some examples, the wireless communication system 100 may support enhanced broadband communications, ultra-reliable (e.g., mission-critical) communications, low-latency communications, or communications with low-cost and low-complexity devices, or any combination thereof.

[0037] Base stations 105 may be dispersed throughout a geographic area to form wireless communication system 100 and may be devices of varying forms or capabilities. Base stations 105 and UEs 115 may communicate wirelessly via one or more communication links 125. Each base station 105 may provide a coverage area 110 over which UEs 115 and base stations 105 may establish one or more communication links 125. Coverage areas 110 may be examples of geographic areas over which base stations 105 and UEs 115 may support transmission of signals according to one or more radio access technologies.

[0038] UEs 115 may be dispersed throughout the coverage area 110 of the wireless communication system 100, and each UE 115 may be stationary, mobile, or both at different times. UEs 115 may be devices of different forms or with different capabilities. Figure 1 1. Some example UEs 115 are shown in FIG. 1. The UEs 115 described herein may be capable of communicating with various types of devices, such as other UEs 115, base stations 105, or network devices (e.g., core network nodes, relays, integrated access and backhaul (IAB) nodes, or other network devices), such as Figure 1 As shown in .

[0039] The UE 115 may include a communication manager 102. The communication manager 102 may be operable to: transmit on resources allocated for interference measurement at the UE, wherein the UE is operating in a full-duplex mode for sidelink communication; determine, based at least in part on the transmission, that an interference level between transmission and reception at the UE satisfies an interference threshold; and switch to a half-duplex mode for sidelink communication based at least in part on the determination.

[0040] The base stations 105 can communicate with the core network 130, or communicate with each other, or perform both operations described above. For example, the base stations 105 can interface with the core network 130 via one or more backhaul links 120 (e.g., via S1, N2, N3, or other interfaces). The base stations 105 can communicate with each other directly (e.g., directly between the base stations 105) or indirectly (e.g., via the core network 130) on the backhaul links 120 (e.g., via X2, Xn, or other interfaces), or perform both operations described above. In some examples, the backhaul links 120 can be or include one or more wireless links.

[0041] One or more of the base stations 105 described herein may include or may be referred to by one of ordinary skill in the art as a base station transceiver, a radio base station, an access point, a radio transceiver, a Node B, an evolved Node B (eNB), a next generation Node B, or a Gigabit Node B (any of which may be referred to as a gNB), a Home Node B, a Home evolved Node B, or some other appropriate terminology.

[0042] The base station 105 may include a communication manager 101. The communication manager 101 at the base station 105 may perform the following operations: sending a control message to a first UE indicating resources allocated for interference measurement; identifying whether the first UE is operating in a full-duplex mode or a half-duplex mode for sidelink communication based at least in part on sending the control message; and scheduling sidelink communication between the first UE and a second UE based at least in part on the identification.

[0043] UE 115 may include or may be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other appropriate terminology, where a "device" may also be referred to as a unit, a station, a terminal, or a client, among other examples. UE 115 may also include or may be referred to as a personal electronic device, such as a cellular phone, a personal digital assistant (PDA), a tablet computer, a laptop computer, or a personal computer. In some examples, UE 115 may include or be referred to as a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or a machine type communication (MTC) device, among other examples, which may be implemented in various items such as appliances, or vehicles, meters, and among other examples.

[0044] The UE 115 described herein may be capable of communicating with various types of devices, such as other UEs 115, which may sometimes act as relays, as well as base stations 105 and network equipment, including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, among other examples. Figure 1 As shown in .

[0045] The UE 115 and the base station 105 can wirelessly communicate with each other via one or more communication links 125 on one or more carriers. The term "carrier" can refer to a collection of radio frequency spectrum resources with a defined physical layer structure for supporting the communication link 125. For example, a carrier used for the communication link 125 can include a portion of a radio frequency spectrum band (e.g., a bandwidth part (BWP)) that operates according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR). Each physical layer channel can carry acquisition signaling (e.g., synchronization signals, system information), control signaling to coordinate operation for the carrier, user data, or other signaling. The wireless communication system 100 can support communication with the UE 115 using carrier aggregation or multi-carrier operation. Depending on the carrier aggregation configuration, the UE 115 can be configured with multiple downlink component carriers and one or more uplink component carriers. Carrier aggregation can be used with both frequency division duplex (FDD) component carriers and time division duplex (TDD) component carriers.

[0046] The communication link 125 shown in the wireless communication system 100 may include an uplink transmission from the UE 115 to the base station 105 (e.g., in a physical uplink shared channel (PUSCH) or a physical uplink control channel (PUCCH)) or a downlink transmission from the base station 105 to the UE 115 (e.g., in a physical downlink shared channel (PDSCH) or a physical downlink control channel (PDCCH)). A carrier may carry downlink or uplink communications (e.g., in FDD mode) or may be configured to carry both downlink and uplink communications (e.g., in TDD mode).

[0047] The signal waveform transmitted on the carrier may be composed of multiple subcarriers (e.g., using a multicarrier modulation (MCM) technique such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM)). In a system employing MCM techniques, a resource element may be composed of one symbol period (e.g., the duration of one modulation symbol) and one subcarrier, where the symbol period and subcarrier spacing are inversely related. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both). Therefore, the more resource elements received by the UE 115 and the higher the order of the modulation scheme, the higher the data rate for the UE 115 can be. Wireless communication resources may refer to a combination of radio frequency spectrum resources, time resources, and spatial resources (e.g., spatial layers or beams), and the use of multiple spatial layers may further increase the data rate or data integrity for communications with the UE 115.

[0048] The basic time unit (which may be referred to as T s =1 / (Δf max ·N f ) seconds sampling period, where Δf max It can represent the maximum supported subcarrier spacing, and N f The time intervals for base station 105 or UE 115 may be expressed as multiples of a maximum supported discrete Fourier transform (DFT) size. The time intervals of communication resources may be organized according to radio frames, each having a specified duration (e.g., 10 milliseconds (ms)). Each radio frame may be identified by a system frame number (SFN) (e.g., ranging from 0 to 1023).

[0049] Each frame may include a plurality of consecutively numbered subframes or time slots, and each subframe or time slot may have the same duration. In some examples, the 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., depending on the length of a cyclic prefix added in front of each symbol period). In some wireless communication systems 100, the time slots may be further divided into a plurality of mini-slots containing one or more symbols. Excluding the cyclic prefix, each symbol period may contain one or more (e.g., N f The duration of a symbol period may depend on the subcarrier spacing or the operating frequency band.

[0050] A subframe, slot, mini-slot, or symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communication system 100 and may be referred to as a transmission time interval (TTI). In some examples, the TTI duration (e.g., the number of symbol periods in a TTI) may be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communication system 100 may be dynamically selected (e.g., in the form of bursts of shortened TTIs (sTTIs)).

[0051] Physical channels may be multiplexed on a carrier according to various techniques. For example, physical control channels and physical data channels may be multiplexed on a downlink carrier using one or more of time division multiplexing (TDM), frequency division multiplexing (FDM), or hybrid TDM-FDM techniques. A control region (e.g., a control resource set (CORESET)) for a physical control channel may be defined by a number of symbol periods and may extend across the system bandwidth of a carrier or a subset of the system bandwidth. One or more control regions (e.g., CORESETs) may be configured for a group of UEs 115. For example, one or more of UEs 115 may monitor or search a control region for control information according to one or more search space sets, and each search space set may include one or more control channel candidates at one or more aggregation levels arranged in a cascaded manner. The aggregation level for a control channel candidate may refer to the number of control channel resources (e.g., control channel elements (CCEs)) associated with the encoded information for a control information format having a given payload size. The search space sets may include a common search space set configured for transmitting control information to multiple UEs 115 and a UE-specific search space set for transmitting control information to a specific UE 115 .

[0052] In some examples, base station 105 can be mobile and, therefore, provide communication coverage for mobile geographic coverage areas 110. In some examples, different geographic coverage areas 110 associated with different technologies can overlap, but the different geographic coverage areas 110 can be supported by the same base station 105. In other examples, overlapping geographic coverage areas 110 associated with different technologies can be supported by different base stations 105. The wireless communication system 100 can include, for example, a heterogeneous network in which different types of base stations 105 use the same or different radio access technologies to provide coverage for various geographic coverage areas 110.

[0053] The wireless communication system 100 can be configured to support ultra-reliable communication or low-latency communication, or various combinations thereof. For example, the wireless communication system 100 can be configured to support ultra-reliable low-latency communication (URLLC) or mission-critical communication. UE 115 can be designed to support ultra-reliable, low-latency or critical functions (e.g., mission-critical functions). Ultra-reliable communication can include private communication or group communication and can be supported by one or more mission-critical services such as mission-critical push-to-talk (MCPTT), mission-critical video (MCVideo), or mission-critical data (MCData). Support for mission-critical functions can include prioritization of services, and mission-critical services can be used for public safety or general commercial applications. The terms ultra-reliable, low-latency, mission-critical, and ultra-reliable low-latency can be used interchangeably in this article.

[0054] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 may be an evolved packet core (EPC) or a 5G core (5GC), which may include at least one control plane entity (e.g., a mobility management entity (MME), an access and mobility management function (AMF)) that manages access and mobility, and at least one user plane entity (e.g., a serving gateway (S-GW), a packet data network (PDN) gateway (P-GW), or a user plane function (UPF)) that routes packets to or interconnects to an external network. The control plane entity may manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management for UEs 115 served by base stations 105 associated with the core network 130. User IP packets may be transmitted through the user plane entity, which may provide IP address allocation and other functions. The user plane entity may be connected to the network operator IP service 150. Operator IP services 150 may include access to the Internet, an intranet, an IP Multimedia Subsystem (IMS), or packet-switched streaming services.

[0055] Some of the network devices, such as base stations 105, may include subcomponents such as access network entities 140, which may be examples of access node controllers (ANCs). Each access network entity 140 may communicate with the UE 115 through one or more other access network transport entities 145, which may be referred to as radio heads, smart radio heads, or transmit / receive points (TRPs). Each access network transport entity 145 may include one or more antenna panels. In some configurations, the various functions of each access network entity 140 or base station 105 may be distributed across various network devices (e.g., radio heads and ANCs) or consolidated into a single network device (e.g., base station 105).

[0056] The wireless communication system 100 can operate using one or more frequency bands, typically in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). Typically, the region from 300 MHz to 3 GHz is referred to as the ultra-high frequency (UHF) region or decimeter band because the wavelengths range from approximately one decimeter to one meter in length. UHF waves can be blocked or redirected by buildings and environmental features, but the waves can penetrate structures sufficiently for macro cells to provide service to UEs 115 located indoors. Transmissions using UHF waves can be associated with smaller antennas and shorter distances (e.g., less than 100 kilometers) compared to transmissions using the lower frequencies and longer waves of the high frequency (HF) or very high frequency (VHF) portions of the spectrum below 300 MHz.

[0057] The wireless communication system 100 can utilize both licensed and unlicensed radio frequency spectrum bands. For example, the wireless communication system 100 can employ license assisted access (LAA), LTE unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed band, such as the 5 GHz industrial, scientific, and medical (ISM) band. When operating in an unlicensed radio frequency spectrum band, devices (such as base stations 105 and UEs 115) can employ carrier sensing for conflict detection and avoidance. In some examples, operations in the unlicensed band can be based on a carrier aggregation configuration (e.g., LAA) in combination with component carriers operating in the licensed band. Operations in the unlicensed spectrum can include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, among other examples.

[0058] The base station 105 or UE 115 may be equipped with multiple antennas that can be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming. The antennas of the base station 105 or UE 115 may be located within one or more antenna arrays or antenna panels (which may support MIMO operations or transmit or receive beamforming). For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly, such as an antenna tower. In some examples, the antennas or antenna arrays associated with the base station 105 may be located at different geographical locations. The base station 105 may have an antenna array having a number of rows and columns of antenna ports that the base station 105 may use to support beamforming for communications with the UE 115. Similarly, the UE 115 may have one or more antenna arrays that may support various MIMO or beamforming operations. Additionally or alternatively, the antenna panel may support radio frequency beamforming for signals transmitted via the antenna ports.

[0059] Beamforming (which may also be referred to as spatial filtering, directional transmission, or directional reception) is a signal processing technique that can be used at a transmitting device or a receiving device (e.g., a base station 105, a UE 115) to form or steer an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming can be achieved by combining signals transmitted via antenna elements of an antenna array so that some signals propagating at a particular orientation relative to the antenna array experience constructive interference, while other signals experience destructive interference. Adjustments to signals transmitted via antenna elements can include the transmitting device or the receiving device applying an amplitude offset, a phase offset, or both to the signals carried via the antenna elements associated with the device. Adjustments associated with each of the antenna elements can be defined by a set of beamforming weights associated with a particular orientation (e.g., relative to the antenna array of the transmitting device or the receiving device, or relative to some other orientation).

[0060] The wireless communication system 100 can be a packet-based network operating according to a layered protocol stack. In the user plane, communications at the bearer or packet data convergence protocol (PDCP) layer can be IP-based. The radio link control (RLC) layer can perform packet segmentation and reassembly for transmission on logical channels. The medium access control (MAC) layer can perform priority handling and multiplexing of logical channels to transport channels. The MAC layer can also use error detection technology, error correction technology, or both to support retransmission at the MAC layer to improve link efficiency. In the control plane, the radio resource control (RRC) protocol layer can provide the establishment, configuration, and maintenance of an RRC connection (which supports radio bearers for user plane data) between the UE 115 and the base station 105 or the core network 130. At the physical layer, transport channels can be mapped to physical channels.

[0061] Some UEs 115 in the wireless communication system 100 may be configured to employ an operating mode that reduces power consumption, such as a half-duplex mode. Half-duplex mode may refer to a mode that supports one-way communication via transmission or reception rather than simultaneous transmission and reception. In some examples, half-duplex communication may be performed at a reduced peak rate. Other power conservation techniques for the UE 115 include entering a power-saving deep sleep mode when not engaged in active communications, operating over a limited bandwidth (e.g., according to narrowband communications), or a combination of these techniques. For example, some UEs 115 may be configured to operate using a narrowband protocol type that is associated with a defined portion or range (e.g., a set of subcarriers or resource blocks (RBs)) within a carrier, within a guard band of a carrier, or outside a carrier.

[0062] In addition to half-duplex mode or as an alternative to half-duplex mode, some UEs 115 may support full-duplex mode. Full-duplex mode may refer to a mode that supports bidirectional communication via simultaneous transmission and reception. Full-duplex mode is an emerging technology that can theoretically double the link capacity by enabling radio network nodes to transmit and receive simultaneously on the same frequency and time radio resources. Full-duplex breaks the half-duplex operation constraint in which transmission and reception are different in time or frequency. A full-duplex network node (such as a base station 105 or UE 115 in a cellular network) can use the same radio resources to communicate with two half-duplex panels simultaneously in the uplink and downlink. Therefore, a UE 115 (e.g., a vehicle in V2X communication) equipped with multiple TRPs may be referred to as a UE with full-duplex capability, which has the ability to transmit and receive simultaneously using the same time-frequency radio resources. UE 115 may also be able to operate in full-duplex mode and fall back to half-duplex mode.

[0063] In some cases, a UE 115 in the wireless communication system 100 may be able to communicate directly with other UEs 115 via a sidelink connection (e.g., using a peer-to-peer (P2P) or device-to-device (D2D) protocol). Such communication may be referred to as D2D or sidelink communication. One or more UEs 115 in a group of UEs 115 utilizing sidelink communication may be within the geographic coverage area 110 of the base station 105. In some cases, other UEs 115 in such a group may be outside the geographic coverage area 110 of the base station 105 or may not be able to receive transmissions from the base station 105. In such cases, the UEs 115 within the geographic coverage 110 of the base station 105 may relay communications between the base station 105 and the UEs 115 outside the geographic coverage area 110 of the base station 105. The UEs 115 communicating via sidelink communication may utilize a one-to-many (1:M) system, in which each UE 115 transmits to each other UE 115 in the group.

[0064] Figure 2 An example of a process flow 200 illustrating scheduling of sidelink communications by a base station 105-a is shown in accordance with aspects of the present disclosure. Figure 2 In an example of , the base station 105-a may facilitate scheduling of resources for sidelink communications. The scheduling of sidelink communications by the base station 105-a may be referred to as resource allocation mode 1. That is, the base station 105-a may allocate resources for sidelink communications between the UEs 115. At 205, the first UE 115-a may send a sidelink buffer status report (BSR) to the base station 105-a. The sidelink BSR may indicate that the UE 115-a has sidelink data to send to the second UE 115-b. At 210, the base station 105-a may send a sidelink grant to the first UE 115-a to schedule resources for the first UE 115-a to use to send sidelink data to the second UE 115-b. Therefore, at 215, the first UE 115-a may send sidelink data to the second UE 115-b on the scheduled resources. Although the base station 105 may schedule sidelink resources for a UE 115 (e.g., a first UE 115-a) upon receiving a sidelink BSR from the UE 115, the base station 105 may be unaware of corresponding transmissions by one or more receiving UEs 115 (e.g., a second UE 115-a) on the scheduled resources.

[0065] Figure 3An example of a process flow 300 is shown illustrating sidelink communications performed between UEs 115 without involving the base station 105. Scheduling of sidelink communications by the UE 115 without involving the base station 105 may be referred to as resource allocation mode 2. That is, a first UE 115-c may identify resources for sidelink communications with a second UE 115-d without involving the base station 105. At 305, the first UE 115-c may autonomously select and reserve resources for sending sidelink data to the second UE 115-d. At 310, the first UE 115-c may then send sidelink data to the second UE 115-d on the reserved resources. Figure 2 and Figure 3 In both, the first UE 115 can send sidelink data on the physical sidelink shared channel (PSSCH). In addition, sidelink communications can include discovery expression transmissions on the physical sidelink discovery channel (PSDCH) (e.g., to allow nearby devices to discover each other's presence). Sidelink communications can also include control information transmissions on the physical sidelink control channel (PSCCH) and feedback transmissions on the physical sidelink feedback channel (PSFCH).

[0066] In some aspects, sidelink communications may include communications between vehicles (e.g., UE 115). In some examples, vehicles may communicate using vehicle-to-everything (V2X) communications, vehicle-to-vehicle (V2V) communications, or some combination thereof. Vehicles may signal information related to traffic conditions, signal scheduling, weather, safety, emergency situations, or any other information related to the V2X system. In some examples, vehicles in a V2X system may communicate with roadside infrastructure (such as roadside units), or communicate with a network via one or more network nodes (e.g., base station 105) using vehicle-to-network (V2N) communications, or both.

[0067] Figure 4An example of a vehicle 400 supporting sidelink communication according to various aspects of the present disclosure is shown. The vehicle 400 may be able to communicate in half-duplex mode and full-duplex mode (e.g., a vehicle with full-duplex capabilities). When communicating in full-duplex mode, the vehicle 400 may experience self-interference. Self-interference can refer to interference between transmission at the vehicle 400 and reception at the vehicle 400 (e.g., between a signal transmitted at the vehicle 400 and a signal received). Therefore, the vehicle 400 can be equipped with at least two TRPs (e.g., a transmitter 405 and a receiver 410) located in different parts of the vehicle 400 to reduce self-interference and achieve better coverage. However, in some cases, even though the TRPs may be located in different parts of the vehicle 400, the vehicle 400 may still experience high self-interference. In addition, the vehicle 400 may experience cluster interference from surrounding objects. Cluster interference can refer to interference from nearby objects or devices that form a cluster.

[0068] In some aspects, a vehicle 400 with full-duplex capability may not always operate efficiently in full-duplex mode due to high interference (e.g., caused by self-interference compounded with cluster interference). That is, high interference may result in a reduced signal-to-interference-plus-noise ratio (SINR) and may result in reduced throughput in the wireless communication system. Furthermore, although Figure 4 An example of a vehicle 400 is shown, but the vehicle 400 can be an example of a UE 115 and can represent any UE 115 that experiences self-interference and cluster interference resulting in reduced throughput. The UEs 115 in the wireless communication system 100 can support efficient techniques for falling back from full-duplex mode to half-duplex mode when self-interference at the UE 115 is high. Interference measurements can be critical for link quality monitoring. That is, in the presence of high interference levels, a full-duplex capable UE 115 may not always operate in full-duplex mode. Alternatively, the UE 115 can fall back to half-duplex mode when certain conditions on the interference level are met. Due to different product designs and hardware and software implementations, the ability to mitigate full-duplex interference for each full-duplex capable UE 115 may be different.

[0069] Figure 5 An example of a wireless communication system 500 that supports sidelink interference monitoring for full-duplex and half-duplex operations in accordance with aspects of the present disclosure is shown. The wireless communication system 500 includes a UE 115-e and a UE 115-f, which may be reference Figure 1-4 The wireless communication system 500 also includes a base station 105-b, which may be a reference to a sidelink UE 115. Figure 1-4An example of a base station 105 is described. Base station 105-b may provide communication coverage for a geographic coverage area 110-a, which may be a reference to a base station 105-b. Figure 1 An example of the geographic coverage area 110 is depicted. The wireless communication system 500 may implement aspects of the wireless communication system 100. For example, a UE 115-e in the wireless communication system 500 may support efficient techniques for falling back from full-duplex mode to half-duplex mode when interference levels at the UE 115-e are high.

[0070] exist Figure 5 In an example, a UE 115-e may monitor an interference level at the UE 115-e, which may be caused by self-interference between a transmitter 505 and a receiver 510 at the UE 115-e. The UE 115-e may identify resources allocated for interference measurement, and the UE 115-e may transmit on these resources. The UE 115-e may then perform measurements on the resources to determine the self-interference level. In some cases, the base station 105-b may allocate resources for interference measurement (e.g., in resource allocation mode 1). That is, the UE 115-e may receive a control message from the base station 105-b allocating resources for interference measurement. In other cases, the UE 115-e may autonomously identify resources for interference measurement (e.g., without the base station 105-b being involved).

[0071] The UE 115-e may then perform measurements on the resources allocated for interference measurement, and the UE 115-e may compare the measurements to one or more thresholds to determine whether the self-interference level is too high. If the self-interference level is too high, the UE 115-e may fall back to half-duplex mode for sidelink communications. That is, since interference mitigation performance may be affected by both the transmitting and receiving side communication entities at the UE 115-e, and link quality may be poor if self-interference or clutter interference due to full-duplex communication is high, it may be appropriate to enable a full-duplex capable UE 115-e to trigger a fallback to half-duplex mode if certain conditions are met.

[0072] In some aspects, the transmitter 505 at the UE 115-e may transmit the CSI-RS on resources allocated for interference measurement. In this example, the resources allocated for interference measurement may be referred to as CSI interference measurement (CSI-IM) resources. In resource allocation mode 1, in which the base station 105-b schedules resources for sidelink communications, the base station 105-b may reserve a periodic pool of time-frequency resources to allow full-duplex capable UEs 115 to perform full-duplex interference measurements. When the transmitter 505 at the UE 115-e transmits the CSI-RS, the receiver 510 at the UE 115-e may receive the CSI-RS from the UE 115-f. The UE 115-e may then perform one or more measurements on the CSI-IM resources to determine the interference level at the UE 115-e (e.g., caused at least in part by self-interference between the transmitter 505 and the receiver 510). For example, the UE 115 - e may measure the SINR, reference signal received power (RSRP), or reference signal received quality (RSRQ) of the CSI-RS received on the resources allocated for interference measurement.

[0073] The one or more measurements may correspond to a self-interference level. In one example, the UE 115-e may compare at least one measurement to a threshold to determine whether the self-interference is too high. For example, a decision as to whether to fall back to half-duplex mode may be based on comparing the interference measurement to one or more predefined thresholds. If the measurement indicates that the interference level meets the interference threshold (e.g., RSRP, RSRQ, or SINR is below the threshold), the UE 115-e may fall back to half-duplex mode for sidelink communication (e.g., because the UE 115-e may determine that the interference level is too high to support full-duplex communication). Alternatively, if the measurement indicates that the interference level is below the interference threshold, the UE 115-e may continue to operate in full-duplex mode. In another example, the UE 115-e may map the measurement (e.g., RSRP) to a block error rate (BLER), and the UE 115-e may compare the BLER to the threshold. If the BLER is equal to or greater than the threshold (e.g., the interference level meets the interference threshold), the UE 115-e may fall back to half-duplex mode for sidelink communications. Alternatively, if the BLER is below the threshold, the UE 115-e may continue to operate in full-duplex mode.

[0074] In other aspects, the transmitter 505 at the UE 115-e may send data packets on resources allocated for interference measurement. In some cases, the UE 115-e may periodically send data packets on resources allocated for interference measurement. For example, the periodic data packets may be triggered by a higher layer at the UE 115-e so that the full-duplex UE 115-e performs full-duplex measurements. The UE 115-e may simultaneously send and decode data packets so that the radio link conditions and self-interference caused by full-duplex communication can be periodically monitored. In other words, the UE 115-e may decode the data packets and determine the interference level caused by the transmission of the data packets at the UE 115-e. The data packets may be specifically designed for sidelink channel state monitoring by a UE 115-e with full-duplex capabilities. For example, the data packets may have a limited transport block size and a low coding rate so that the UE 115-e can successfully decode the data packets (e.g., even under relatively high interference levels). If the UE 115-e is unable to decode the data packet or if the quality of the decoded data packet is below a threshold, the UE 115-e may fall back to half-duplex mode for sidelink communication (e.g., because the UE 115-e may determine that the interference level is too high to support full-duplex communication). Alternatively, if the UE 115-e is able to decode the data packet or the quality of the decoded data packet is equal to or above the threshold, the UE 115-e may continue to operate in full-duplex mode.

[0075] In some cases (e.g., in resource allocation mode 2), to enable efficient scheduling of sidelink communications between UE 115-e and UE 115-f, UE 115-e may notify UE 115-f of the mode in which UE 115-e is operating, and UE 115-f may notify UE 115-e of the mode in which UE 115-f is operating. That is, sidelink UE 115 may notify one or more other sidelink UEs 115 of the mode in which sidelink UE 115 is operating. For example, after switching to half-duplex mode, UE 115-e may send an indication to UE 115-f that UE 115-e is operating in half-duplex mode for sidelink communications. In such a case, UE 115-f may schedule communications with UE 115-e based on the fact that UE 115-e is operating in half-duplex mode. Specifically, UE 115-f may avoid scheduling transmissions to UE 115-e on resources used by UE 115-e to transmit to UE 115-f (ie, avoid scheduling UE 115-e for full-duplex communications).

[0076] The sidelink UE 115 may also inform one or more other sidelink UEs 115 whether the sidelink UE 115 is capable of full-duplex communication (e.g., full-duplex capability) and whether the sidelink UE 115 is capable of falling back to half-duplex mode (e.g., half-duplex fallback capability). For example, full-duplex capability and half-duplex fallback capability may be capabilities of the UE 115 in sidelink communication, and the sidelink UE 115 may indicate full-duplex capability, half-duplex fallback capability, or both as UE capabilities. Thus, the full-duplex capability, half-duplex fallback capability, or duplex mode may be shared among the sidelink communication entities to achieve better resource allocation. In one case, the UE 115-e may unicast the full-duplex and half-duplex fallback capabilities to the UE 115-f (e.g., in a MAC control element (MAC-CE) or RRC signaling). In addition, UE 115-e may also indicate the time slot pattern to UE 115-f (e.g., in sidelink control information (SCI), MAC-CE, or RRC signaling) so that UE 115-f can appropriately schedule sidelink communications with UE 115-e. That is, the sidelink time slot pattern used by UE 115-e may also be shared with UE 115-f and updated in SCI, MAC-CE, or RRC signaling, and UE 115-f may schedule sidelink communications with UE 115-e based on the time slot pattern used by UE 115-e (e.g., as well as the time slot pattern used by UE 115-f).

[0077] In other cases (e.g., in resource allocation mode 1), to allow efficient scheduling of sidelink communications between UE 115-e and UE 115-f, UE 115-e may notify base station 105-b of the mode in which UE 115-e is operating. UE 115-e may also notify base station 105-b of whether UE 115 is capable of full-duplex communication and whether UE 115-e is capable of falling back to half-duplex mode. That is, sidelink UE 115 may notify serving base station 105 of the mode in which sidelink UE 115 is operating, whether UE 115 supports full-duplex communication, whether UE 115 is capable of falling back to half-duplex mode, or a combination thereof. Thus, base station 105-b may be able to identify the constraints of UE 115-e when scheduling sidelink communications between UE 115-e and UE 115-f. The base station 105-b may then schedule sidelink communications between the UE 115-e and the UE 115-f based on the duplex mode, full-duplex capability, or half-duplex fallback capability of the UE 115-e. The UE 115-f may also indicate the duplex mode, full-duplex capability, or half-duplex fallback capability of the UE 115-f to the base station 105-b, and the base station 105-b may schedule sidelink communications between the UE 115-e and the UE 115-f based on the duplex mode, full-duplex capability, or half-duplex fallback capability of the UE 115-f.

[0078] In some aspects, a UE 115-e may decide whether to operate in full-duplex mode or fall back to half-duplex mode based on CSI feedback from other UEs 115 (e.g., including UE 115-f). If the UE 115-e decides to change the duplex mode, the UE 115-e may request a mode switch and trigger a reconfiguration to the base station 105-b (e.g., the serving base station 105). As an example, if the UE 115-e determines that the interference level meets the interference threshold, the UE 115-e may send a request to the base station 105-b to operate in half-duplex mode. The UE 115-e may then receive a reconfiguration message from the base station 105-b that configures the UE 115-e to operate in half-duplex mode. In other aspects, UE 115-e may forward CSI reports received from other UEs 115 (e.g., including UE 115-f) to base station 105-b, and base station 105-b may decide whether to configure UE 115-e for full-duplex communication or half-duplex communication (e.g., reconfigure UE 115-e for half-duplex communication).

[0079] Figure 6An example of a process flow 600 for supporting sidelink interference monitoring for full-duplex and half-duplex operations in accordance with aspects of the present disclosure is shown. The process flow 600 illustrates a process flow for supporting sidelink interference monitoring for full-duplex and half-duplex operations in accordance with aspects of the present disclosure. Figure 1-5 Aspects of the techniques performed at low layers 605 and high layers 610 at an example of a UE 115 described herein.

[0080] Whenever the lower layer 605 at the UE 115 detects that the interference level meets the threshold, the lower layer 605 can send an out-of-sync indication to the upper layer 610. As an example, the lower layer 605 can detect that the interference level meets the threshold after a number of consecutive decoding failures. For example, within a duration (e.g., a predefined timer), the lower layer 605 can count the number of consecutive decoding failure opportunities. Once the number of consecutive decoding failure opportunities exceeds the threshold, the lower layer 605 can determine that the interference level meets the threshold and can send an out-of-sync indication to the upper layer 610. Similarly, whenever the lower layer 605 at the UE 115 detects that the self-interference level fails to meet the threshold, the lower layer 605 can send an in-sync indication to the upper layer 610. The lower layer 605 can detect that the self-interference level fails to meet the threshold after a number of consecutive decoding successes. For example, within a duration (e.g., a predefined timer), the lower layer 605 can count the number of consecutive decoding success opportunities. Once the number of consecutive decoding success opportunities exceeds a threshold, the lower layer 605 may determine that the interference level fails to meet the threshold and may send a synchronization indication to the upper layer 610 .

[0081] In one example, the lower layers 605 at the UE 115 may identify decoding failures and successes based on comparing at least one measurement performed on the CSI-RS received on the CSI-IM resource with a threshold. In this example, the lower layers 605 may determine that a decoding failure exists when the RSRP, RSRQ, or SINR of the CSI-RS is below the threshold or the corresponding BLER of the CSI-RS is equal to or higher than the threshold. Alternatively, the lower layers 605 may determine that a decoding success exists when the RSRP, RSRQ, or SINR of the CSI-RS is equal to or higher than the threshold or the corresponding BLER is lower than the threshold. In another example, the lower layers 605 at the UE 115 may identify decoding failures and successes based on whether the UE 115 is able to decode a data packet sent by the UE 115. In this example, the lower layers 605 may determine that a decoding failure exists when the UE 115 fails to decode the data packet or the quality of the decoded data packet is lower than the threshold. Alternatively, the lower layers 605 may determine that there is a decoding success when the UE 115 successfully decodes the data packet or the quality of the decoded data packet is above a threshold.

[0082] If the high layer 610 at the UE 115 receives a threshold number of consecutive out-of-sync indications, the high layer 610 can trigger a fallback from a full-duplex mode to a half-duplex mode at the UE 115 (e.g., if the UE 115 is not already operating in the half-duplex mode). Alternatively, if the high layer 610 at the UE 115 receives a threshold number of consecutive in-sync indications, the high layer 610 can trigger a switch from a half-duplex mode to a full-duplex mode at the UE 115 (e.g., if the UE 115 is not already operating in the full-duplex mode). In Figure 6 In an example of 615, 620, and 625, the high layer 610 at the UE 115 can receive a threshold number of out-of-sync indications (e.g., N1) from the low layer 605. Thus, at 630, the high layer 610 can trigger a fallback to a half-duplex mode. Then, at 635, 640, and 645, the high layer 610 at the UE 115 can receive a threshold number of in-sync indications (e.g., N2) from the low layer 605. Thus, the high layer 610 at the UE 115 can trigger a switch back to a full-duplex mode.

[0083] Figure 7 FIG. 7 shows a block diagram of a device 705 that supports sidelink interference monitoring for full-duplex and half-duplex operations in accordance with aspects of the present disclosure. The device 705 can be an example of aspects of a UE 115 as described herein. The device 705 can include a receiver 710, a communications manager 715, and a transmitter 720. The device 705 can also include a processor. Each of these components can be in communication with one another (e.g., via one or more buses).

[0084] The receiver 710 can receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to sidelink interference monitoring for full-duplex and half-duplex operations, etc.). Information can be passed on to other components of the device 705. The receiver 710 can be an example of aspects of the transceiver 1020 described with reference to FIG. 10. The receiver 710 can utilize a single antenna or a set of antennas. Figure 10 The communications manager 715 can transmit on resources allocated for interference measurements at a UE, where the UE is operating in a full-duplex mode for sidelink communications, determine, based on the transmitting, that an interference level between transmissions and receptions at the UE satisfies an interference threshold, and switch to a half-duplex mode for the sidelink communications based on the determining. The communications manager 715 can be an example of aspects of the communications manager 1010 described herein.

[0085] The communications manager 715 can transmit on resources allocated for interference measurements at a UE, where the UE is operating in a full-duplex mode for sidelink communications, determine, based on the transmitting, that an interference level between transmissions and receptions at the UE satisfies an interference threshold, and switch to a half-duplex mode for the sidelink communications based on the determining. The communications manager 715 can be an example of aspects of the communications manager 1010 described herein.

[0086] The communication manager 715 or its subcomponents may be implemented in hardware, in code executed by a processor (e.g., software or firmware), or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 715 or its subcomponents may be performed by a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof, designed to perform the functions described in this disclosure.

[0087] The communication manager 715 or its subcomponents can be physically located at various locations, including being distributed so that portions of the functionality are implemented by one or more physical components at different physical locations. In some examples, according to various aspects of the present disclosure, the communication manager 715 or its subcomponents can be separate and distinct components. In some examples, according to various aspects of the present disclosure, the communication manager 715 or its subcomponents can be combined with one or more other hardware components (including but not limited to input / output (I / O) components, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof).

[0088] The transmitter 720 may transmit signals generated by other components of the device 705. In some examples, the transmitter 720 may be co-located with the receiver 710 in a transceiver module. For example, the transmitter 720 may be a reference Figure 10 Examples of aspects of the transceiver 1020 are described. The transmitter 720 may utilize a single antenna or a group of antennas.

[0089] Figure 8 A block diagram 800 of a device 805 supporting sidelink interference monitoring for full-duplex and half-duplex operation according to aspects of the present disclosure is shown. The device 805 can be an example of aspects of the device 705 or UE 115 as described herein. The device 805 can include a receiver 810, a communication manager 815, and a transmitter 835. The device 805 can also include a processor. Each of these components can be in communication with each other (e.g., via one or more buses).

[0090] The receiver 810 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to sidelink interference monitoring for full-duplex and half-duplex operations). The information may be passed to other components of the device 805. The receiver 810 may be a reference to Figure 10 Examples of various aspects of the transceiver 1020 are described. The receiver 810 may utilize a single antenna or a group of antennas.

[0091] Communications manager 815 may be an example of aspects of communications manager 715 as described herein. Communications manager 815 may include interference resource manager 820, interference manager 825, and operating mode manager 830. Communications manager 815 may be an example of aspects of communications manager 1010 as described herein.

[0092] Interference resource manager 820 may transmit on resources allocated for interference measurement at a UE, wherein the UE is operating in full-duplex mode for sidelink communication. Interference manager 825 may determine, based on the transmission, that the interference level between transmission and reception at the UE meets an interference threshold. Operation mode manager 830 may switch to half-duplex mode for sidelink communication based on the determination.

[0093] The transmitter 835 can transmit signals generated by other components of the device 805. In some examples, the transmitter 835 can be co-located with the receiver 810 in a transceiver module. For example, the transmitter 835 can be a reference Figure 10 Examples of various aspects of the transceiver 1020 are described. The transmitter 835 may utilize a single antenna or a group of antennas.

[0094] Figure 9 A block diagram 900 is shown of a communication manager 905 that supports sidelink interference monitoring for full-duplex and half-duplex operation in accordance with aspects of the present disclosure. The communication manager 905 can be an example of aspects of the communication manager 715, the communication manager 815, or the communication manager 1010 described herein. The communication manager 905 can include an interference resource manager 910, an interference manager 915, an operating mode manager 920, a CSI manager 925, a data manager 930, a decoder 935, and a sidelink manager 940. Each of these modules can communicate with each other directly or indirectly (e.g., via one or more buses).

[0095] Interference resource manager 910 may transmit on resources allocated for interference measurement at a UE, wherein the UE is operating in full-duplex mode for sidelink communication. Interference manager 915 may determine, based on the transmission, that the interference level between transmission and reception at the UE meets an interference threshold. Operation mode manager 920 may switch to half-duplex mode for sidelink communication based on the determination.

[0096] The CSI manager 925 may send a channel state information reference signal on resources allocated for interference measurement, wherein the interference measurement includes a channel state information interference measurement. In some examples, the interference manager 915 may perform at least one measurement on resources allocated for interference measurement, wherein determining that the interference level meets the interference threshold is based on performing the at least one measurement. In some examples, the at least one measurement is compared with an interference threshold, wherein determining that the interference level meets the interference threshold includes determining that the at least one measurement meets the interference threshold. In some examples, the interference manager 915 may map the at least one measurement to a block error rate. In some examples, the interference manager 915 may compare the block error rate with the interference threshold, wherein determining that the interference level meets the interference threshold includes determining that the block error rate meets the interference threshold.

[0097] The data manager 930 may send a data packet on a resource allocated for interference measurement. The decoder 935 may decode the data packet, wherein determining that the interference level meets the interference threshold is based on decoding the data packet. In some examples, whenever the UE determines that the interference level between transmission and reception at the UE meets the interference threshold, the interference manager 915 may send an out-of-sync indication from the bottom layer at the UE to the upper layer at the UE. In some examples, the operating mode manager 920 may switch to half-duplex mode for sidelink communication based on the upper layer at the UE receiving a threshold number of consecutive out-of-sync indications. In some examples, whenever the UE determines that the interference level between transmission and reception at the UE fails to meet the interference threshold, the interference manager 915 may send a synchronization indication from the bottom layer at the UE to the upper layer at the UE. In some examples, the operating mode manager 920 may switch back to full-duplex mode for sidelink communication based on the upper layer at the UE receiving a threshold number of consecutive in-sync indications.

[0098] In some cases, the UE is a first UE, and the operating mode manager 920 may send an indication to the second UE that the first UE is operating in half-duplex mode for sidelink communication after switching to half-duplex mode. In some examples, the operating mode manager 920 may receive an indication from the second UE as to whether the second UE is operating in full-duplex mode or half-duplex mode for sidelink communication. The sidelink manager 940 may schedule sidelink communication with the second UE based on whether the second UE is operating in full-duplex mode or half-duplex mode. In some cases, the UE is a first UE, and the sidelink manager 940 may send an indication of a time slot pattern used by the first UE for sidelink communication to the second UE. In some cases, the UE is a first UE, and the sidelink manager 940 may receive an indication of a time slot pattern used by the second UE for sidelink communication from the second UE. In some examples, the sidelink manager 940 may schedule sidelink communication with the second UE based on the time slot pattern used by the second UE for sidelink communication.

[0099] In some examples, the operating mode manager 920 may send a request to the base station to operate in half-duplex mode based on the interference level satisfying the interference threshold. In some examples, the operating mode manager 920 may receive a reconfiguration message from the base station to configure the UE to operate in half-duplex mode, wherein the fallback to half-duplex mode for sidelink communication is based on receiving the reconfiguration message. In some cases, the UE is a first UE, and the CSI manager 925 may forward a channel state information report received from a second UE to the base station. In some examples, the operating mode manager 920 may receive an indication from the base station of whether to operate in full-duplex mode or half-duplex mode for sidelink communication based on forwarding the channel state information report. In some examples, the interference resource manager 910 may receive a control message from the base station indicating resources allocated for interference measurement. In some cases, the resources allocated for interference measurement are periodic. In some examples, operating in full-duplex mode includes simultaneously transmitting and receiving on the same set of time and frequency resources, and wherein operating in half-duplex mode includes transmitting or receiving on the set of time and frequency resources.

[0100] Figure 10A schematic diagram of a system 1000 including a device 1005 that supports sidelink interference monitoring for full-duplex and half-duplex operation according to various aspects of the present disclosure is shown. The device 1005 can be an example of, or include components of, the device 705, device 805, or UE 115 as described herein. The device 1005 can include components for two-way voice and data communications, including components for sending and receiving communications, including a communication manager 1010, an I / O controller 1015, a transceiver 1020, an antenna 1025, a memory 1030, and a processor 1040. These components can communicate electronically via one or more buses (e.g., bus 1045).

[0101] The communication manager 1010 may perform the following operations: transmitting on resources allocated for interference measurement at a UE, wherein the UE is operating in full-duplex mode for sidelink communication; determining based on the transmitting that an interference level between transmission and reception at the UE satisfies an interference threshold; and switching to half-duplex mode for sidelink communication based on the determination.

[0102] I / O controller 1015 can manage input and output signals for device 1005. I / O controller 1015 can also manage peripheral devices that are not integrated into device 1005. In some cases, I / O controller 1015 can represent a physical connection or port to an external peripheral device. In some cases, I / O controller 1015 can utilize a computer such as , or another known operating system. In other cases, I / O controller 1015 may represent or interact with a modem, keyboard, mouse, touch screen, or similar device. In some cases, I / O controller 1015 may be implemented as part of a processor. In some cases, a user may interact with device 1005 via I / O controller 1015 or via hardware components controlled by I / O controller 1015.

[0103] The transceiver 1020 can communicate bidirectionally via one or more antennas, wired or wireless links as described above. For example, the transceiver 1020 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. The transceiver 1020 can also include a modem for modulating packets and providing the modulated packets to the antenna for transmission, and demodulating packets received from the antenna.

[0104] In some cases, a wireless device may include a single antenna 1025. However, in some cases, the device may have more than one antenna 1025, which may be capable of sending or receiving multiple wireless transmissions simultaneously.

[0105] The memory 1030 may include random access memory (RAM) and read-only memory (ROM). The memory 1030 may store computer-readable, computer-executable code 1035, which includes instructions that, when executed, cause the processor to perform the various functions described herein. In some cases, the memory 1030 may also contain, among other things, a basic input / output system (BIOS), which may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0106] The processor 1040 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, the processor 1040 may be configured to operate a memory array using a memory controller. In other cases, the memory controller may be integrated into the processor 1040. The processor 1040 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1030) to cause the device 1005 to perform various functions (e.g., functions or tasks supporting sidelink interference monitoring for full-duplex and half-duplex operations).

[0107] The code 1035 may include instructions for implementing various aspects of the present disclosure, including instructions for supporting wireless communications. The code 1035 may be stored in a non-transitory computer-readable medium (such as system memory or other types of memory). In some cases, the code 1035 may not be directly executable by the processor 1040, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0108] Figure 11 A block diagram 1100 is shown of a device 1105 that supports sidelink interference monitoring for full-duplex and half-duplex operation in accordance with aspects of the present disclosure. The device 1105 can be an example of aspects of the base station 105 as described herein. The device 1105 can include a receiver 1110, a communication manager 1115, and a transmitter 1120. The device 1105 can also include a processor. Each of these components can be in communication with each other (e.g., via one or more buses).

[0109] The receiver 1110 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to sidelink interference monitoring for full-duplex and half-duplex operations). The information may be passed to other components of the device 1105. The receiver 1110 may be a reference Figure 14Examples of aspects of the described transceiver 1420. The receiver 1110 can utilize a single antenna or a set of antennas.

[0110] The communications manager 1115 can transmit, to a first UE, a control message indicating resources allocated for interference measurements, identify, based on transmitting the control message, whether the first UE is operating in a full-duplex mode or a half-duplex mode for sidelink communications, and schedule, based on the identifying, a sidelink communication between the first UE and a second UE. The communications manager 1115 can be an example of aspects of the communications manager 1410 described herein.

[0111] The communications manager 1115, or its sub-components, can be implemented in hardware, code (for example, software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the communications manager 1115, or its sub-components can be executed by a general-purpose processor, a DSP, an application-specific integrated circuit (ASIC), an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.

[0112] The communications manager 1115, or its sub-components, can be physically located at various positions, including being distributed so that portions of functions are implemented at different physical locations by one or more physical components. In some examples, the communications manager 1115, or its sub-components, can be a separate and distinct component in accordance with various aspects of the present disclosure. In some examples, the communications manager 1115, or its sub-components, can be combined with one or more other hardware components, including but not limited to an input / output (I / O) component, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof in accordance with various aspects of the present disclosure.

[0113] The transmitter 1120 can transmit signals generated by other components of the device 1105. In some examples, the transmitter 1120 can be collocated with a receiver 1110 in a transceiver module. For example, the transmitter 1120 can be a transmitter Figure 14 Examples of aspects of the described transceiver 1420. The receiver 1110 can utilize a single antenna or a set of antennas.

[0114] Figure 12A block diagram 1200 is shown of a device 1205 that supports sidelink interference monitoring for full-duplex and half-duplex operation in accordance with aspects of the present disclosure. The device 1205 can be an example of aspects of the device 1105 or base station 105 as described herein. The device 1205 can include a receiver 1210, a communication manager 1215, and a transmitter 1235. The device 1205 can also include a processor. Each of these components can be in communication with each other (e.g., via one or more buses).

[0115] The receiver 1210 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to sidelink interference monitoring for full-duplex and half-duplex operations). The information may be passed to other components of the device 1205. The receiver 1210 may be a reference to Figure 14 Examples of various aspects of the transceiver 1420 are described. The receiver 1210 may utilize a single antenna or a group of antennas.

[0116] Communications manager 1215 may be an example of aspects of communications manager 1115 as described herein. Communications manager 1215 may include interference resource manager 1220, operating mode manager 1225, and sidelink manager 1230. Communications manager 1215 may be an example of aspects of communications manager 1410 as described herein.

[0117] Interference resource manager 1220 may transmit a control message to the first UE indicating resources allocated for interference measurement. Operation mode manager 1225 may identify, based on the transmitted control message, whether the first UE is operating in full-duplex mode or half-duplex mode for sidelink communication. Sidelink manager 1230 may schedule sidelink communication between the first UE and the second UE based on the identification.

[0118] The transmitter 1235 can transmit signals generated by other components of the device 1205. In some examples, the transmitter 1235 can be co-located with the receiver 1210 in a transceiver module. For example, the transmitter 1235 can be a reference Figure 14 Examples of various aspects of the transceiver 1420 are described. The transmitter 1235 can utilize a single antenna or a group of antennas.

[0119] Figure 13A block diagram 1300 is shown of a communication manager 1305 that supports sidelink interference monitoring for full-duplex and half-duplex operation in accordance with aspects of the present disclosure. The communication manager 1305 can be an example of aspects of the communication manager 1115, the communication manager 1215, or the communication manager 1410 described herein. The communication manager 1305 can include an interference resource manager 1310, an operating mode manager 1315, a sidelink manager 1320, and a CSI manager 1325. Each of these modules can communicate with each other directly or indirectly (e.g., via one or more buses).

[0120] Interference resource manager 1310 may transmit a control message to the first UE indicating resources allocated for interference measurement. Operation mode manager 1315 may identify, based on the transmitted control message, whether the first UE is operating in full-duplex mode or half-duplex mode for sidelink communication. Sidelink manager 1320 may schedule sidelink communication between the first UE and the second UE based on the identification.

[0121] In some examples, the operating mode manager 1315 can receive a request from the first UE to operate in full-duplex mode or half-duplex mode. In some examples, the operating mode manager 1315 can send a reconfiguration message to the first UE to configure the UE to operate in full-duplex mode or half-duplex mode, wherein identifying whether the first UE is operating in full-duplex mode or half-duplex mode for sidelink communication is based on sending the reconfiguration message.

[0122] The CSI manager 1325 can receive a channel state information report forwarded from the second UE from the first UE. In some examples, the operating mode manager 1315 can send an indication to the first UE of whether to operate in full-duplex mode or half-duplex mode for sidelink communication based on the channel state information report, wherein identifying whether the first UE is operating in full-duplex mode or half-duplex mode for sidelink communication is based on sending the indication. In some cases, the resources allocated for interference measurement are periodic.

[0123] Figure 14A schematic diagram of a system 1400 including a device 1405 supporting sidelink interference monitoring for full-duplex and half-duplex operation according to aspects of the present disclosure is shown. Device 1405 can be an example of, or include components of, device 1105, device 1205, or base station 105 as described herein. Device 1405 can include components for two-way voice and data communications, including components for sending and receiving communications, including a communications manager 1410, a network communications manager 1415, a transceiver 1420, an antenna 1425, a memory 1430, a processor 1440, and an inter-station communications manager 1445. These components can communicate electronically via one or more buses (e.g., bus 1450).

[0124] The communication manager 1410 can perform the following operations: sending a control message to the first UE indicating the resources allocated for interference measurement; identifying whether the first UE is operating in full-duplex mode or half-duplex mode for sidelink communication based on the sending of the control message; and scheduling sidelink communication between the first UE and the second UE based on the identification.

[0125] The network communications manager 1415 may manage communications with the core network (eg, via one or more wired backhaul links). For example, the network communications manager 1415 may manage the transmission of data communications for client devices, such as one or more UEs 115.

[0126] The transceiver 1420 can communicate bidirectionally via one or more antennas, wired or wireless links as described above. For example, the transceiver 1420 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. The transceiver 1420 can also include a modem for modulating packets and providing the modulated packets to the antenna for transmission, and demodulating packets received from the antenna.

[0127] In some cases, a wireless device may include a single antenna 1425. However, in some cases, the device may have more than one antenna 1425, which may be capable of sending or receiving multiple wireless transmissions simultaneously.

[0128] Memory 1430 may include RAM, ROM, or a combination thereof. Memory 1430 may store computer-readable code 1435, which includes instructions that, when executed by a processor (e.g., processor 1440), cause the device to perform various functions described herein. In some cases, memory 1430 may also contain, among other things, a BIOS that controls basic hardware or software operations, such as interaction with peripheral components or devices.

[0129] The processor 1440 can include an intelligent hardware device, (e.g., a general- purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, the processor 1440 can be configured to operate a memory array using a memory controller. In some cases, a memory controller can be integrated into the processor 1440. The processor 1440 can be configured to execute computer-readable instructions stored in a memory (e.g., the memory 1430) to cause the device 1405 to perform various functions (e.g., functions or tasks for supporting sidelink interference monitoring for full-duplex and half-duplex operations).

[0130] The inter-station communications manager 1445 can manage communications with other base station 105, and can include a controller or scheduler for controlling

[0131] The code 1435 can include instructions for implementing aspects of the present disclosure, including instructions for supporting wireless communications. The code 1435 can be stored in a non-transitory computer-readable medium such as system memory or other type of memory. In some cases, the code 1435 can not be directly executable by the processor 1440 but can cause a computer (e.g., when compiled and executed) to perform functions described herein.

[0132] Figure 15 A flow diagram illustrating a method 1500 that supports sidelink interference monitoring for full-duplex and half-duplex operations in accordance with aspects of the present disclosure is shown. The operations of method 1500 can be implemented by a UE 115 or its components as described herein. For example, the operations of method 1500 can be performed by a communications manager as described with reference to Figures 7 to 10 In some examples, a UE can execute a set of instructions to control the functional units of the UE to perform the functions described below. Additionally or alternatively, the UE can perform aspects of the functions described below using special-purpose hardware. The instructions can be stored in the memory 1430 and implemented in software and / or firmware, such as instructions stored in the memory 1430 and implemented by the processor 1440.

[0133] At 1505, the UE can transmit on resources allocated for interference measurements at the UE, where the UE is operating in a full-duplex mode for sidelink communications. The operations of 1505 can be performed according to the methods described herein. In some examples, aspects of the operations of 1505 can be performed by a transmitter as described with reference to FIG. 7. Figures 7 to 10 Describes the interference resource manager to perform.

[0134] At 1510, the UE may determine, based on the transmission, that the interference level between the transmission and the reception at the UE satisfies the interference threshold. The operations of 1510 may be performed according to the methods described herein. In some examples, aspects of the operations of 1510 may be as described with reference to Figures 7 to 10 Described interference manager to perform.

[0135] At 1515, the UE may switch to half-duplex mode for sidelink communication based on the determination. The operations of 1515 may be performed according to the methods described herein. In some examples, aspects of the operations of 1515 may be as described with reference to Figures 7 to 10 Describes the operations the mode manager performs.

[0136] Figure 16 A flow chart illustrating a method 1600 for supporting sidelink interference monitoring for full-duplex and half-duplex operations in accordance with aspects of the present disclosure is shown. The operations of the method 1600 may be implemented by the base station 105 or components thereof as described herein. For example, the operations of the method 1600 may be implemented by the base station 105 or components thereof as described herein. Figures 11 to 14 In some examples, the base station may execute an instruction set to control the functional units of the base station to perform the functions described below. Additionally or alternatively, the base station may use dedicated hardware to perform various aspects of the functions described below.

[0137] At 1605, the base station may send a control message to the first UE indicating resources allocated for interference measurement. The operations of 1605 may be performed according to the methods described herein. In some examples, aspects of the operations of 1605 may be as described with reference to Figures 11 to 14 Describes the interference resource manager to perform.

[0138] At 1610, the base station may identify whether the first UE is operating in full-duplex mode or half-duplex mode for sidelink communication based on sending a control message. The operations of 1610 may be performed according to the methods described herein. In some examples, aspects of the operations of 1610 may be as described with reference to Figures 11 to 14 Describes the operations the mode manager performs.

[0139] At 1615, the base station may schedule sidelink communications between the first UE and the second UE based on the identification. The operations of 1615 may be performed according to the methods described herein. In some examples, aspects of the operations of 1615 may be as described with reference to Figures 11 to 14 The sidelink manager described is used to perform the above operations.

[0140] The following provides a summary of examples of the present disclosure:

[0141] Example 1: A method for wireless communication at a UE, comprising: transmitting on resources allocated for interference measurement at the UE, wherein the UE is operating in full-duplex mode for sidelink communication; determining, at least in part based on the transmitting, that an interference level between transmission and reception at the UE satisfies an interference threshold; and switching to half-duplex mode for sidelink communication based at least in part on the determination.

[0142] Example 2: A method according to Example 1, wherein sending on resources allocated for interference measurement includes: sending a channel state information reference signal on the resources allocated for interference measurement, wherein the interference measurement includes a channel state information interference measurement.

[0143] Example 3: The method according to any one of Examples 1 or 2 further includes: performing at least one measurement on the resources allocated for interference measurement, wherein determining whether the interference level meets the interference threshold is at least partially based on performing the at least one measurement.

[0144] Example 4: The method according to any one of Examples 1 to 3 further includes: comparing the at least one measurement with the interference threshold, wherein determining that the interference level meets the interference threshold includes: determining that the at least one measurement meets the interference threshold.

[0145] Example 5: The method according to any one of Examples 1 to 4 further includes: mapping the at least one measurement to a block error rate; and comparing the block error rate with the interference threshold, wherein determining that the interference level meets the interference threshold includes: determining that the block error rate meets the interference threshold.

[0146] Example 6: The method of any one of Examples 1 to 5, wherein transmitting on the resources allocated for interference measurement comprises transmitting a data packet on the resources allocated for interference measurement.

[0147] Example 7: The method of any one of Examples 1 to 6, further comprising decoding the data packet, wherein determining that the interference level satisfies the interference threshold is based at least in part on decoding the data packet.

[0148] Example 8: The method according to any one of Examples 1 to 7 further includes: whenever the UE determines that the interference level between transmission and reception at the UE meets the interference threshold, sending an out-of-sync indication from the bottom layer at the UE to the upper layer at the UE.

[0149] Example 9: A method according to any one of Examples 1 to 8, wherein switching to the half-duplex mode for the sidelink communication is at least partially based on the upper layer at the UE receiving a threshold number of consecutive out-of-sync indications.

[0150] Example 10: The method according to any one of Examples 1 to 9 further includes: whenever the UE determines that the interference level between transmission and reception at the UE fails to meet the interference threshold, sending a synchronization indication from the bottom layer at the UE to the upper layer at the UE.

[0151] Example 11: The method according to any one of Examples 1 to 10 also includes: switching back to the full-duplex mode used for the sidelink communication at least in part based on the upper layer at the UE receiving a threshold number of consecutive synchronization indications.

[0152] Example 12: A method according to any one of Examples 1 to 11, wherein the UE includes a first UE, and the method further includes: after switching to the half-duplex mode, sending an indication to a second UE that the first UE is operating in the half-duplex mode for sidelink communication.

[0153] Example 13: A method according to any one of Examples 1 to 12, wherein the UE includes a first UE, and the method further includes: receiving an indication from a second UE as to whether the second UE is operating in the full-duplex mode or the half-duplex mode for sidelink communication; and scheduling sidelink communication with the second UE based at least in part on whether the second UE is operating in the full-duplex mode or the half-duplex mode.

[0154] Example 14: A method according to any one of Examples 1 to 13, wherein the UE includes a first UE, and the method further includes: sending an indication of a time slot pattern used by the first UE for sidelink communication to a second UE.

[0155] Example 15: A method according to any one of Examples 1 to 14, wherein the UE includes a first UE, and the method further includes: receiving an indication of a time slot pattern used by a second UE for sidelink communication from a second UE; and scheduling sidelink communication with the second UE based at least in part on the time slot pattern used by the second UE for sidelink communication.

[0156] Example 16: The method according to any one of Examples 1 to 15 further includes: sending a request to a base station to operate in the half-duplex mode based at least in part on the interference level satisfying the interference threshold; and receiving a reconfiguration message from the base station to configure the UE to operate in the half-duplex mode, wherein falling back to the half-duplex mode for sidelink communication is based at least in part on receiving the reconfiguration message.

[0157] Example 17: The method according to any one of Examples 1 to 16 further includes: forwarding a channel state information report received from a second UE to a base station; and receiving an indication from the base station of operating in the full-duplex mode or the half-duplex mode for sidelink communication based at least in part on forwarding the channel state information report.

[0158] Example 18: The method according to any one of Examples 1 to 17 further includes: receiving a control message from a base station indicating the resources allocated for interference measurement.

[0159] Example 19: The method of any one of Examples 1 to 18, wherein the resources allocated for interference measurement are periodic.

[0160] Example 20: A method according to any one of Examples 1 to 19, wherein operating in full-duplex mode includes: sending and receiving simultaneously on the same set of time and frequency resources, and wherein operating in half-duplex mode includes: sending or receiving on the set of time and frequency resources.

[0161] Example 21: A method for wireless communication at a base station, comprising: sending a control message to a first UE indicating resources allocated for interference measurement; identifying whether the first UE is operating in a full-duplex mode or a half-duplex mode for sidelink communication based at least in part on sending the control message; and scheduling sidelink communication between the first UE and a second UE based at least in part on the identification.

[0162] Example 22: The method according to Example 21 further includes: receiving a request to operate in full-duplex mode or half-duplex mode from the first UE; and sending a reconfiguration message to the first UE to configure the UE to operate in the full-duplex mode or the half-duplex mode, wherein identifying whether the first UE is operating in the full-duplex mode or the half-duplex mode for sidelink communication is at least partially based on sending the reconfiguration message.

[0163] Example 23: The method of any one of Examples 21 or 22, further comprising: receiving, from the first UE, a channel state information report forwarded from the second UE; and transmitting, to the first UE, an indication of whether to operate in the full-duplex mode or the half-duplex mode for sidelink communications based at least in part on the channel state information report, wherein identifying whether the first UE is operating in the full-duplex mode or the half-duplex mode for sidelink communications is based at least in part on transmitting the indication.

[0164] Example 24: The method of any one of Examples 21 to 23, wherein the resources allocated for interference measurements are periodic.

[0165] Example 25: An apparatus for wireless communication, comprising at least one means for performing a method of any one of Examples 1 to 20.

[0166] Example 26: An apparatus for wireless communication, comprising a processor and a memory coupled to the processor. The processor and memory can be configured to cause the apparatus to perform a method of any one of Examples 1 to 20.

[0167] Example 27: A non-transitory computer-readable medium storing code for wireless communication, comprising a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method of any one of Examples 1 to 20.

[0168] Example 28: An apparatus for wireless communication, comprising at least one means for performing a method of any one of Examples 21 to 24.

[0169] Example 29: An apparatus for wireless communication, comprising a processor and a memory coupled to the processor. The processor and memory can be configured to cause the apparatus to perform a method of any one of Examples 21 to 24.

[0170] Example 30: A non-transitory computer-readable medium storing code for wireless communication, comprising a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method of any one of Examples 21 to 24.

[0171] It should be noted that the methods described herein describe possible implementations, and that the operations and the steps can be rearranged or otherwise modified and that other implementations are possible. Further, aspects from two or more of the methods can be combined.

[0172] Although aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for example purposes, and the terminology of LTE, LTE-A, LTE-A Pro, or NR may be used throughout much of the description, the techniques described herein are applicable beyond LTE, LTE-A, LTE-A Pro, or NR networks. For example, the techniques described may be applicable to various other wireless communication systems, such as Ultra Mobile Broadband (UMB), Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, and other systems and radio technologies not explicitly mentioned herein.

[0173] The information and signals described herein may be represented using any of a variety of different techniques and methods. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be mentioned throughout the description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0174] The various illustrative blocks and components described in conjunction with the disclosure herein may be implemented or executed using a general purpose processor, a DSP, an ASIC, a CPU, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, a combination of one or more microprocessors and a DSP core, or any other such configuration).

[0175] The functions described herein may be implemented using hardware, software executed by a processor, firmware, or any combination thereof. If implemented using software executed by a processor, the functions may be stored on or transmitted through a computer-readable medium as one or more instructions or codes. Other examples and implementations are within the scope of this disclosure and the appended claims. For example, due to the nature of software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or a combination of any of these. Features that implement the functions may also be physically located at various locations, including being distributed so that portions of the functions are implemented at different physical locations.

[0176] Computer readable medium includes non-transient computer storage medium and communication medium, and communication medium includes any medium that promotes the transmission of computer program from one place to another place.Non-transient storage medium can be any available medium that can be accessed by general-purpose computer or special-purpose computer.By way of example and not limitation, non-transient computer readable medium can include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, compact disc (CD) ROM or other optical disc storage, disk storage or other magnetic storage device or can be used for carrying or storing desired program code unit and any other non-transient medium that can be accessed by general-purpose or special-purpose computer or general or special-purpose processor in the form of instruction or data structure.In addition, any connection is suitably referred to as computer readable medium.For example, if software is to be sent from website, server or other remote source using coaxial cable, optical fiber cable, twisted pair, digital subscriber line (DSL) or wireless technology such as infrared, radio and microwave, then coaxial cable, optical fiber cable, twisted pair, DSL or wireless technology such as infrared, radio and microwave are included in the definition of computer readable medium. As used herein, disk and disc include CD, laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc, wherein disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

[0177] As used herein (including in the claims), "or" as used in a list of items (e.g., a list of items ending with a phrase such as "at least one of" or "one or more of") indicates an inclusive list, so that, for example, a list of at least one of A, B, or C means A, or B, or C, or AB, or AC, or BC, or ABC (i.e., A and B and C). Furthermore, as used herein, the phrase "based on" should not be interpreted as a reference to a closed set of conditions. For example, an example step described as "based on condition A" could be based on both condition A and condition B without departing from the scope of this disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "based at least in part on."

[0178] In the accompanying drawings, similar components or features may have the same reference number. In addition, various components of the same type may be distinguished by following the reference number with a dash and a second reference number to distinguish between similar components. If only the first reference number is used in the specification, the description applies to any one of the similar components having the same first reference number, regardless of the second reference number or other subsequent reference numbers.

[0179] The descriptions set forth herein in conjunction with the accompanying drawings describe example configurations and do not represent all examples that can be implemented or within the scope of the claims. The term "example" as used herein means "serving as an example, instance, or illustration," rather than "preferred" or "having advantages over other examples." For the purpose of providing an understanding of the described techniques, the detailed description includes specific details. 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.

[0180] The description herein is provided to enable one of ordinary skill in the art to implement or use the present disclosure. Various modifications to the present disclosure will be apparent to one of ordinary skill in the art, and the overall principles defined herein may be applied to other variations without departing from the scope of the present disclosure. Therefore, the present disclosure is not limited to the examples and designs described herein, but is intended to be used in the broadest sense consistent with the principles and novel features disclosed herein.

Claims

1. A method for wireless communication at a user equipment (UE), comprising: receiving, from a network entity, a control message indicating resources allocated for interference measurement at the UE in full-duplex mode for self-interference between transmission and reception at the UE; transmitting on the resources allocated for performing interference measurement at the UE in full-duplex mode for self-interference between transmission and reception at the UE, wherein the UE is operating in full-duplex mode for sidelink communication; determining, based at least in part on the transmitting, that an interference level between transmitting and receiving at the UE satisfies an interference threshold; and Switching to a half-duplex mode for sidelink communications is performed based at least in part on the determination.

2. The method according to claim 1, wherein Transmitting on resources allocated for interference measurement at the UE in full-duplex mode for self-interference between transmission and reception at the UE includes: A channel state information reference signal is sent on the resources allocated for interference measurement at the UE in full-duplex mode for self-interference between transmission and reception at the UE, wherein the interference measurement comprises a channel state information interference measurement.

3. The method according to claim 2, further comprising: performing at least one measurement on the resources allocated for interference measurement at the UE in full-duplex mode for self-interference between transmission and reception at the UE, wherein determining that the interference level satisfies the interference threshold is based at least in part on performing the at least one measurement.

4. The method according to claim 3, further comprising: The at least one measurement is compared to the interference threshold, wherein determining that the interference level satisfies the interference threshold comprises determining that the at least one measurement satisfies the interference threshold.

5. The method according to claim 3, further comprising: mapping the at least one measurement to a block error rate; as well as The block error rate is compared with the interference threshold, wherein determining that the interference level satisfies the interference threshold includes determining that the block error rate satisfies the interference threshold.

6. The method according to claim 1, wherein Transmitting on resources allocated for interference measurement at the UE in full-duplex mode for self-interference between transmission and reception at the UE includes: Data packets are sent on the resources allocated for interference measurement at the UE in full-duplex mode for self-interference between transmission and reception at the UE.

7. The method according to claim 6, further comprising: The data packet is decoded, wherein determining that the interference level satisfies the interference threshold is based at least in part on decoding the data packet.

8. The method according to claim 1, further comprising: Whenever the UE determines that the interference level between transmission and reception at the UE satisfies the interference threshold, an out-of-sync indication is sent from a lower layer at the UE to an upper layer at the UE.

9. The method according to claim 8, wherein: Switching to the half-duplex mode for sidelink communication is based at least in part on receiving a threshold number of consecutive out-of-sync indications by the upper layer at the UE.

10. The method according to claim 1, further comprising: Whenever the UE determines that the interference level between transmission and reception at the UE fails to meet the interference threshold, a synchronization indication is sent from a lower layer at the UE to an upper layer at the UE.

11. The method according to claim 10, further comprising: Switching back to the full-duplex mode for sidelink communication is performed based at least in part on receiving a threshold number of consecutive synchronization indications by the upper layer at the UE.

12. The method according to claim 1, wherein The UE includes a first UE, and the method further includes: After switching to the half-duplex mode, an indication is sent to a second UE that the first UE is operating in the half-duplex mode for sidelink communication.

13. The method according to claim 1, wherein The UE includes a first UE, and the method further includes: receiving an indication from a second UE of whether the second UE is operating in the full-duplex mode or the half-duplex mode for sidelink communication; and Sidelink communications with the second UE are scheduled based at least in part on whether the second UE is operating in the full-duplex mode or the half-duplex mode.

14. The method according to claim 1, wherein The UE includes a first UE, and the method further includes: An indication of a timeslot pattern used by the first UE for sidelink communication is sent to a second UE.

15. The method according to claim 1, wherein The UE includes a first UE, and the method further includes: receiving, from a second UE, an indication of a slot pattern to be used by the second UE for sidelink communications; and Sidelink communications with the second UE are scheduled based at least in part on the slot pattern used by the second UE for sidelink communications.

16. The method according to claim 1, further comprising: sending a request to the network entity to operate in the half-duplex mode based at least in part on the interference level satisfying the interference threshold; as well as A reconfiguration message is received from the network entity that configures the UE to operate in the half-duplex mode, wherein falling back to the half-duplex mode for sidelink communication is based at least in part on receiving the reconfiguration message.

17. The method according to claim 1, wherein The UE includes a first UE, and the method further includes: forwarding a channel state information report received from the second UE to the network entity; and An indication of operating in the full-duplex mode or the half-duplex mode for sidelink communications is received from the network entity based at least in part on forwarding the channel state information report.

18. The method according to claim 1, wherein the UE comprises a first UE, the method further comprising: Based on the channel state information feedback from the second UE, a decision is made to operate in full-duplex mode or switch to half-duplex mode.

19. The method according to claim 1, wherein The resources allocated for interference measurement are periodic.

20. The method of claim 1, wherein: Operating in full-duplex mode includes transmitting and receiving simultaneously on the same set of time and frequency resources, and wherein operating in half-duplex mode includes transmitting or receiving on the set of time and frequency resources.

21. A method for wireless communication at a network entity, comprising: sending a control message to a first UE indicating resources allocated for performing interference measurement for self-interference between transmission and reception at the first UE in full-duplex mode; identifying, based at least in part on sending the control message, whether the first UE is operating in a full-duplex mode or a half-duplex mode for sidelink communication; as well as Sidelink communications between the first UE and a second UE are scheduled based at least in part on the identification.

22. The method according to claim 21, further comprising: receiving a request from the first UE to operate in full-duplex mode or half-duplex mode; as well as and sending a reconfiguration message to the first UE to configure the first UE to operate in the full-duplex mode or the half-duplex mode, wherein identifying whether the first UE is operating in the full-duplex mode or the half-duplex mode for sidelink communication is based at least in part on sending the reconfiguration message.

23. The method of claim 21, further comprising: receiving, from the first UE, a channel state information report forwarded from the second UE; as well as and sending an indication to the first UE as to whether to operate in the full-duplex mode or the half-duplex mode for sidelink communication based at least in part on the channel state information report, wherein identifying whether the first UE is operating in the full-duplex mode or the half-duplex mode for sidelink communication is based at least in part on sending the indication.

24. The method according to claim 21, wherein The resources allocated for interference measurement for self-interference between transmission and reception at the first UE in full-duplex mode are periodic.

25. An apparatus for wireless communication at a user equipment (UE), comprising: one or more processors; as well as one or more memories coupled to the one or more processors, the one or more processors configured to: receiving, from a network entity, a control message indicating resources allocated for interference measurement at the UE in full-duplex mode for self-interference between transmission and reception at the UE; transmitting on the resources allocated for interference measurement by the UE in full-duplex mode for self-interference between transmission and reception at the UE, wherein the UE is operating in full-duplex mode for sidelink communication; determining, based at least in part on the transmitting, that an interference level between transmitting and receiving at the UE satisfies an interference threshold; and Switching to a half-duplex mode for sidelink communications is performed based at least in part on the determination.

26. The device according to claim 25, wherein To transmit on resources allocated for interference measurement at the UE in full-duplex mode for self-interference between transmission and reception at the UE, the one or more processors are further configured to: A channel state information reference signal is sent on the resources allocated for interference measurement at the UE in full-duplex mode for self-interference between transmission and reception at the UE, wherein the interference measurement comprises a channel state information interference measurement.

27. The device according to claim 26, wherein The one or more processors are further configured to: performing at least one measurement on the resources allocated for interference measurement at the UE in full-duplex mode for self-interference between transmission and reception at the UE, wherein determining that the interference level satisfies the interference threshold is based at least in part on performing the at least one measurement.

28. The apparatus according to claim 27, wherein The one or more processors are further configured to: The at least one measurement is compared to the interference threshold, wherein determining that the interference level satisfies the interference threshold comprises determining that the at least one measurement satisfies the interference threshold.

29. The apparatus according to claim 27, wherein The one or more processors are further configured to: mapping the at least one measurement to a block error rate; as well as The block error rate is compared with the interference threshold, wherein determining that the interference level satisfies the interference threshold includes determining that the block error rate satisfies the interference threshold.

30. The apparatus of claim 25, wherein: To transmit on resources allocated for interference measurement at the UE in full-duplex mode for self-interference between transmission and reception at the UE, the one or more processors are further configured to: Data packets are sent on the resources allocated for interference measurement at the UE in full-duplex mode for self-interference between transmission and reception at the UE.

31. The apparatus according to claim 30, wherein The one or more processors are further configured to: The data packet is decoded, wherein determining that the interference level satisfies the interference threshold is based at least in part on decoding the data packet.

32. The apparatus according to claim 25, wherein The one or more processors are further configured to: Whenever the UE determines that the interference level between transmission and reception at the UE satisfies the interference threshold, an out-of-sync indication is sent from a lower layer at the UE to an upper layer at the UE.

33. The apparatus of claim 32, wherein: Switching to the half-duplex mode for sidelink communication is based at least in part on receiving a threshold number of consecutive out-of-sync indications by the upper layer at the UE.

34. The apparatus of claim 25, wherein: The one or more processors are further configured to: Whenever the UE determines that the interference level between transmission and reception at the UE fails to meet the interference threshold, a synchronization indication is sent from a lower layer at the UE to an upper layer at the UE.

35. The apparatus of claim 34, wherein: The one or more processors are further configured to: Switching back to the full-duplex mode for sidelink communication is performed based at least in part on receiving a threshold number of consecutive synchronization indications by the upper layer at the UE.

36. The apparatus of claim 25, wherein: The UE includes a first UE, and the one or more processors are further configured to: After switching to the half-duplex mode, an indication is sent to a second UE that the first UE is operating in the half-duplex mode for sidelink communication.

37. The apparatus of claim 25, wherein: The UE includes a first UE, and the one or more processors are further configured to: receiving an indication from a second UE of whether the second UE is operating in the full-duplex mode or the half-duplex mode for sidelink communication; and Sidelink communications with the second UE are scheduled based at least in part on whether the second UE is operating in the full-duplex mode or the half-duplex mode.

38. The apparatus of claim 25, wherein: The UE includes a first UE, and the one or more processors are further configured to: An indication of a timeslot pattern used by the first UE for sidelink communication is sent to a second UE.

39. The apparatus of claim 25, wherein: The UE includes a first UE, and the one or more processors are further configured to: receiving, from a second UE, an indication of a slot pattern to be used by the second UE for sidelink communications; and Sidelink communications with the second UE are scheduled based at least in part on the slot pattern used by the second UE for sidelink communications.

40. The apparatus of claim 25, wherein The one or more processors are further configured to: sending a request to the network entity to operate in the half-duplex mode based at least in part on the interference level satisfying the interference threshold; and A reconfiguration message is received from the network entity that configures the UE to operate in the half-duplex mode, wherein falling back to the half-duplex mode for sidelink communication is based at least in part on receiving the reconfiguration message.

41. The apparatus of claim 25, wherein: The UE includes a first UE, and the one or more processors are further configured to: forwarding a channel state information report received from the second UE to the network entity; and An indication of operating in the full-duplex mode or the half-duplex mode for sidelink communications is received from the network entity based at least in part on forwarding the channel state information report.

42. The apparatus of claim 25, wherein the UE comprises a first UE, the one or more processors being further configured to: Based on the channel state information feedback from the second UE, a decision is made to operate in full-duplex mode or switch to half-duplex mode.

43. The apparatus of claim 25, wherein: The resources allocated for interference measurement at the UE in full-duplex mode for self-interference between transmission and reception at the UE are periodic.

44. The apparatus of claim 25, wherein: Operating in full-duplex mode includes transmitting and receiving simultaneously on the same set of time and frequency resources, and wherein operating in half-duplex mode includes transmitting or receiving on the set of time and frequency resources.

45. An apparatus for wireless communication at a network entity, comprising: one or more processors; as well as one or more memories coupled to the one or more processors, the one or more processors configured to: sending a control message to a first UE indicating resources allocated for performing interference measurement for self-interference between transmission and reception at the first UE in full-duplex mode; identifying, based at least in part on sending the control message, whether the first UE is operating in a full-duplex mode or a half-duplex mode for sidelink communication; as well as Sidelink communications between the first UE and a second UE are scheduled based at least in part on the identification.

46. ​​The apparatus of claim 45, wherein The one or more processors are further configured to: receiving a request from the first UE to operate in full-duplex mode or half-duplex mode; and and sending a reconfiguration message to the first UE to configure the first UE to operate in the full-duplex mode or the half-duplex mode, wherein identifying whether the first UE is operating in the full-duplex mode or the half-duplex mode for sidelink communication is based at least in part on sending the reconfiguration message.

47. The apparatus of claim 45, wherein: The one or more processors are further configured to: receiving, from the first UE, a channel state information report forwarded from the second UE; and and sending an indication to the first UE as to whether to operate in the full-duplex mode or the half-duplex mode for sidelink communication based at least in part on the channel state information report, wherein identifying whether the first UE is operating in the full-duplex mode or the half-duplex mode for sidelink communication is based at least in part on sending the indication.

48. The apparatus of claim 45, wherein The resources allocated for interference measurement for self-interference between transmission and reception at the first UE in full-duplex mode are periodic.

49. An apparatus for wireless communication at a user equipment (UE), comprising: means for receiving, from a network entity, a control message indicating resources allocated for interference measurement at the UE in full-duplex mode for self-interference between transmission and reception at the UE; means for transmitting on the resources allocated for interference measurement by the UE in full-duplex mode for self-interference between transmission and reception at the UE, wherein the UE is operating in full-duplex mode for sidelink communication; means for determining, based at least in part on the transmitting, that an interference level between transmitting and receiving at the UE satisfies an interference threshold; and Means for switching to a half-duplex mode for sidelink communications based at least in part on the determination.

50. The apparatus of claim 49, wherein The means for transmitting on resources allocated for performing interference measurement at the UE in full-duplex mode for self-interference between transmission and reception at the UE comprises: Means for sending a channel state information reference signal on the resources allocated for interference measurement at the UE in full duplex mode for self-interference between transmission and reception at the UE, wherein the interference measurement comprises a channel state information interference measurement.

51. The apparatus of claim 50, further comprising: and means for performing at least one measurement on the resources allocated for interference measurement at the UE in full-duplex mode for self-interference between transmission and reception at the UE, wherein determining that the interference level satisfies the interference threshold is based at least in part on performing the at least one measurement.

52. The apparatus of claim 51 , further comprising: means for comparing the at least one measurement to the interference threshold, wherein the means for determining that the interference level satisfies the interference threshold comprises means for determining that the at least one measurement satisfies the interference threshold.

53. The apparatus of claim 51 , further comprising: means for mapping the at least one measurement to a block error rate; as well as The method further comprises: providing a unit for comparing the block error rate with the interference threshold, wherein determining that the interference level satisfies the interference threshold comprises determining that the block error rate satisfies the interference threshold.

54. The apparatus of claim 49, wherein The means for transmitting on resources allocated for performing interference measurement at the UE in full-duplex mode for self-interference between transmission and reception at the UE comprises: Means for sending data packets on the resources allocated for interference measurement at the UE in full-duplex mode for self-interference between transmission and reception at the UE.

55. The apparatus of claim 54, further comprising: Means for decoding the data packet, wherein determining that the interference level satisfies the interference threshold is based at least in part on decoding the data packet.

56. The apparatus of claim 49, further comprising: means for sending an out-of-sync indication from a lower layer at the UE to an upper layer at the UE whenever the UE determines that the interference level between transmission and reception at the UE satisfies the interference threshold.

57. The apparatus of claim 56, wherein: Switching to the half-duplex mode for sidelink communication is based at least in part on receiving a threshold number of consecutive out-of-sync indications by the upper layer at the UE.

58. The apparatus of claim 49, further comprising: means for sending a synchronization indication from a lower layer at the UE to an upper layer at the UE whenever the UE determines that the interference level between transmission and reception at the UE fails to meet the interference threshold.

59. The apparatus of claim 58, further comprising: Means for switching back to the full-duplex mode for sidelink communication based at least in part on receipt by the upper layer at the UE of a threshold number of consecutive synchronization indications.

60. The apparatus of claim 49, wherein The UE includes a first UE, and the apparatus further includes: means for sending an indication to a second UE that the first UE is operating in the half-duplex mode for sidelink communication after switching to the half-duplex mode.

61. The apparatus of claim 49, wherein The UE includes a first UE, and the apparatus further includes: means for receiving, from a second UE, an indication of whether the second UE is operating in the full-duplex mode or the half-duplex mode for sidelink communication; and Means for scheduling sidelink communications with the second UE based at least in part on whether the second UE is operating in the full-duplex mode or the half-duplex mode.

62. The apparatus of claim 49, wherein: The UE includes a first UE, and the apparatus further includes: Means for sending, to a second UE, an indication of a slot pattern used by the first UE for sidelink communication.

63. The apparatus of claim 49, wherein The UE includes a first UE, and the apparatus further includes: means for receiving, from a second UE, an indication of a slot pattern to be used by the second UE for sidelink communications; and Means for scheduling sidelink communications with the second UE based at least in part on the slot pattern used by the second UE for sidelink communications.

64. The apparatus of claim 49, further comprising: means for sending a request to the network entity to operate in the half-duplex mode based at least in part on the interference level satisfying the interference threshold; as well as Means for receiving a reconfiguration message from the network entity configuring the UE to operate in the half-duplex mode, wherein falling back to the half-duplex mode for sidelink communication is based at least in part on receiving the reconfiguration message.

65. The apparatus of claim 49, wherein The UE includes a first UE, and the apparatus further includes: means for forwarding a channel state information report received from a second UE to the network entity; and Means for receiving, from the network entity, an indication of operating in the full-duplex mode or the half-duplex mode for sidelink communications based at least in part on forwarding the channel state information report.

66. The apparatus of claim 49, wherein the UE comprises a first UE, the apparatus further comprising: means for deciding to operate in full-duplex mode or switch to half-duplex mode based on channel state information feedback from the second UE.

67. The apparatus of claim 49, wherein The resources allocated for interference measurement are periodic.

68. The apparatus of claim 49, wherein: Operating in full-duplex mode includes transmitting and receiving simultaneously on the same set of time and frequency resources, and wherein operating in half-duplex mode includes transmitting or receiving on the set of time and frequency resources.

69. An apparatus for wireless communication at a network entity, comprising: means for sending a control message to a first UE indicating resources allocated for performing interference measurement at the first UE in full-duplex mode for self-interference between transmission and reception at the first UE; means for identifying whether the first UE is operating in a full-duplex mode or a half-duplex mode for sidelink communication based at least in part on sending the control message; as well as Means for scheduling sidelink communications between the first UE and a second UE based at least in part on the identifying.

70. The apparatus of claim 69, further comprising: means for receiving a request from the first UE to operate in full-duplex mode or half-duplex mode; as well as A unit for sending a reconfiguration message to the first UE to configure the first UE to operate in the full-duplex mode or the half-duplex mode, wherein identifying whether the first UE is operating in the full-duplex mode or the half-duplex mode for sidelink communication is based at least in part on sending the reconfiguration message.

71. The apparatus of claim 69, further comprising: means for receiving, from the first UE, a channel state information report forwarded from the second UE; as well as A unit for sending an indication to the first UE as to whether to operate in the full-duplex mode or the half-duplex mode for sidelink communication based at least in part on the channel state information report, wherein identifying whether the first UE is operating in the full-duplex mode or the half-duplex mode for sidelink communication is based at least in part on sending the indication.

72. The apparatus of claim 69, wherein The resources allocated for interference measurement for self-interference between transmission and reception at the first UE in full-duplex mode are periodic.

73. A non-transitory computer-readable medium storing code for wireless communication at a user equipment (UE), the code comprising instructions executable by a processor to: receiving, from a network entity, a control message indicating resources allocated for interference measurement at the UE in full-duplex mode for self-interference between transmission and reception at the UE; transmitting on the resources allocated for interference measurement by the UE in full-duplex mode for self-interference between transmission and reception at the UE, wherein the UE is operating in full-duplex mode for sidelink communication; determining, based at least in part on the transmitting, that an interference level between transmitting and receiving at the UE satisfies an interference threshold; and Switching to a half-duplex mode for sidelink communications is performed based at least in part on the determination.

74. The non-transitory computer readable medium of claim 73, wherein: To transmit on resources allocated for interference measurement at the UE in full-duplex mode for self-interference between transmission and reception at the UE, the code further includes instructions executable by the processor to: A channel state information reference signal is sent on the resources allocated for interference measurement at the UE in full-duplex mode for self-interference between transmission and reception at the UE, wherein the interference measurement comprises a channel state information interference measurement.

75. The non-transitory computer readable medium of claim 74, wherein: The code also includes instructions executable by the processor to: performing at least one measurement on the resources allocated for interference measurement at the UE in full-duplex mode for self-interference between transmission and reception at the UE, wherein determining that the interference level satisfies the interference threshold is based at least in part on performing the at least one measurement.

76. The non-transitory computer readable medium of claim 75, wherein: The code also includes instructions executable by the processor to: The at least one measurement is compared to the interference threshold, wherein determining that the interference level satisfies the interference threshold comprises determining that the at least one measurement satisfies the interference threshold.

77. The non-transitory computer readable medium of claim 75, wherein: The code also includes instructions executable by the processor to: mapping the at least one measurement to a block error rate; as well as The block error rate is compared with the interference threshold, wherein determining that the interference level satisfies the interference threshold includes determining that the block error rate satisfies the interference threshold.

78. The non-transitory computer readable medium of claim 73, wherein: To transmit on resources allocated for interference measurement at the UE in full-duplex mode for self-interference between transmission and reception at the UE, the code further includes instructions executable by the processor to: Data packets are sent on the resources allocated for interference measurement at the UE in full-duplex mode for self-interference between transmission and reception at the UE.

79. The non-transitory computer readable medium of claim 78, wherein: The code also includes instructions executable by the processor to: The data packet is decoded, wherein determining that the interference level satisfies the interference threshold is based at least in part on decoding the data packet.

80. The non-transitory computer readable medium of claim 73, wherein: The code also includes instructions executable by the processor to: Whenever the UE determines that the interference level between transmission and reception at the UE satisfies the interference threshold, an out-of-sync indication is sent from a lower layer at the UE to an upper layer at the UE.

81. The non-transitory computer-readable medium of claim 80, wherein: Switching to the half-duplex mode for sidelink communication is based at least in part on receiving a threshold number of consecutive out-of-sync indications by the upper layer at the UE.

82. The non-transitory computer readable medium of claim 73, wherein: The code also includes instructions executable by the processor to: Whenever the UE determines that the interference level between transmission and reception at the UE fails to meet the interference threshold, a synchronization indication is sent from a lower layer at the UE to an upper layer at the UE.

83. The non-transitory computer readable medium of claim 82, wherein: The code also includes instructions executable by the processor to: Switching back to the full-duplex mode for sidelink communication is performed based at least in part on receiving a threshold number of consecutive synchronization indications by the upper layer at the UE.

84. The non-transitory computer readable medium of claim 73, wherein: The UE includes a first UE, and the code further includes instructions executable by the processor to perform the following operations: After switching to the half-duplex mode, an indication is sent to a second UE that the first UE is operating in the half-duplex mode for sidelink communication.

85. The non-transitory computer readable medium of claim 73, wherein: The UE includes a first UE, and the code further includes instructions executable by the processor to perform the following operations: receiving an indication from a second UE of whether the second UE is operating in the full-duplex mode or the half-duplex mode for sidelink communication; and Sidelink communications with the second UE are scheduled based at least in part on whether the second UE is operating in the full-duplex mode or the half-duplex mode.

86. The non-transitory computer readable medium of claim 73, wherein: The UE includes a first UE, and the code further includes instructions executable by the processor to perform the following operations: An indication of a timeslot pattern used by the first UE for sidelink communication is sent to a second UE.

87. The non-transitory computer readable medium of claim 73, wherein: The UE includes a first UE, and the code further includes instructions executable by the processor to perform the following operations: receiving, from a second UE, an indication of a slot pattern to be used by the second UE for sidelink communications; and Sidelink communications with the second UE are scheduled based at least in part on the slot pattern used by the second UE for sidelink communications.

88. The non-transitory computer readable medium of claim 73, wherein: The code also includes instructions executable by the processor to: sending a request to the network entity to operate in the half-duplex mode based at least in part on the interference level satisfying the interference threshold; as well as A reconfiguration message is received from the network entity that configures the UE to operate in the half-duplex mode, wherein falling back to the half-duplex mode for sidelink communication is based at least in part on receiving the reconfiguration message.

89. The non-transitory computer readable medium of claim 73, wherein: The UE includes a first UE, and the code further includes instructions executable by the processor to perform the following operations: forwarding a channel state information report received from the second UE to the network entity; and An indication of operating in the full-duplex mode or the half-duplex mode for sidelink communications is received from the network entity based at least in part on forwarding the channel state information report.

90. The non-transitory computer-readable medium of claim 73, the UE comprising a first UE, the code further comprising instructions executable by the processor to: Based on the channel state information feedback from the second UE, a decision is made to operate in full-duplex mode or switch to half-duplex mode.

91. The non-transitory computer readable medium of claim 73, wherein: The resources allocated for interference measurement are periodic.

92. The non-transitory computer-readable medium of claim 73, wherein: Operating in full-duplex mode includes transmitting and receiving simultaneously on the same set of time and frequency resources, and wherein operating in half-duplex mode includes transmitting or receiving on the set of time and frequency resources.

93. A non-transitory computer-readable medium storing code for wireless communication at a network entity, the code comprising instructions executable by a processor to: sending a control message to a first UE indicating resources allocated for performing interference measurement for self-interference between transmission and reception at the first UE in full-duplex mode; identifying, based at least in part on sending the control message, whether the first UE is operating in a full-duplex mode or a half-duplex mode for sidelink communication; as well as Sidelink communications between the first UE and a second UE are scheduled based at least in part on the identification.

94. The non-transitory computer readable medium of claim 93, wherein: The code also includes instructions executable by the processor to: receiving a request from the first UE to operate in full-duplex mode or half-duplex mode; and and sending a reconfiguration message to the first UE to configure the first UE to operate in the full-duplex mode or the half-duplex mode, wherein identifying whether the first UE is operating in the full-duplex mode or the half-duplex mode for sidelink communication is based at least in part on sending the reconfiguration message.

95. The non-transitory computer readable medium of claim 93, wherein: The code also includes instructions executable by the processor to: receiving, from the first UE, a channel state information report forwarded from the second UE; and and sending an indication to the first UE as to whether to operate in the full-duplex mode or the half-duplex mode for sidelink communication based at least in part on the channel state information report, wherein identifying whether the first UE is operating in the full-duplex mode or the half-duplex mode for sidelink communication is based at least in part on sending the indication.

96. The non-transitory computer readable medium of claim 93, wherein: The resources allocated for interference measurement for self-interference between transmission and reception at the first UE in full-duplex mode are periodic.

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