Confliction handling based on SBFD configured symbol type

Abstract

Certain aspects of the present disclosure provide a method for wireless communications at a user equipment (UE) generally including obtaining first signaling indicating at least one symbol is configured as a subband full duplex (SBFD) symbol with at least one downlink component carrier (CC) and at least one uplink CC, obtaining second signaling indicating that directional collision handling is enabled for a set of one or more serving cells associated with the at least one downlink CC and the at least one uplink CC, and communicating with the one or more serving cells based on a symbol direction for the at least one SBFD symbol, wherein the symbol direction is based on one or more rules.

Description

CONFLICTION HANDLING BASED ON SBFD CONFIGURED SYMBOL TYPECross-Reference to Related Application(s)

[0001] This application claims priority to U.S. Patent Application No. 18 / 426,121, filed January 29, 2024, which is assigned to the assignee hereof and hereby expressly incorporated by reference in its entirety as if fully set forth below and for all applicable purposes.Field of the Disclosure

[0002] Aspects of the present disclosure relate to wireless communications, and more particularly, to techniques for subband full duplex (SBFD) wireless communications.Description of Related Art

[0003] Wireless communications systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, broadcasts, or other similar types of services. These wireless communications systems may employ multiple-access technologies capable of supporting communications with multiple users by sharing available wireless communications system resources with those users.

[0004] Although wireless communications systems have made great technological advancements over many years, challenges still exist. For example, complex and dynamic environments can still attenuate or block signals between wireless transmitters and wireless receivers. Accordingly, there is a continuous desire to improve the technical performance of wireless communications systems, including, for example: improving speed and data carrying capacity of communications, improving efficiency of the use of shared communications mediums, reducing power used by transmitters and receivers while performing communications, improving reliability of wireless communications, avoiding redundant transmissions and / or receptions and related processing, improving the coverage area of wireless communications, increasing the number and types of devices that can access wireless communications systems, increasing the ability for different types of devices to intercommunicate, increasing the number and type of wireless communications mediums available for use, and the like. Consequently, there exists a need for further improvements in wireless communications systems to overcome the aforementioned technical challenges and others.SUMMARY

[0005] One aspect provides a method for wireless communications at a user equipment (UE). The method includes obtaining first signaling indicating at least one symbol is configured as a subband full duplex (SBFD) symbol with at least one downlink component carrier (CC) and at least one uplink CC; obtaining second signaling indicating that directional collision handling is enabled for a set of one or more serving cells associated with the at least one downlink CC and the at least one uplink CC; and communicating with the one or more serving cells based on a symbol direction for the at least one SBFD symbol, wherein the symbol direction is based on one or more rules.

[0006] Another aspect provides a method for wireless communications at a user equipment (UE). The method includes outputting, to a network entity, first signaling indicating a capability of the UE to support subband full duplex (SBFD) operation in transmission time intervals (TTIs) with a transmission direction designated as downlink or flexible; obtaining second signaling, from the network entity, indicating a TTI for SBFD operation, wherein the TTI has a transmission direction designated as downlink or flexible; and communicating with the network entity in the TTI in accordance with the indicated capability.

[0007] Another aspect provides a method for wireless communications at a network entity. The method includes outputting first signaling indicating at least one symbol is configured as a subband full duplex (SBFD) symbol with at least one downlink component carrier (CC) and at least one uplink CC; outputting second signaling indicating that directional collision handling is enabled for a set of one or more serving cells associated with the at least one downlink CC and the at least one uplink CC; and communicating with at least one user equipment (UE) based on a symbol direction for the at least one SBFD symbol, wherein the symbol direction is based on one or more rules.

[0008] Another aspect provides a method for wireless communications at a network entity. The method includes obtaining first signaling indicating a capability of a user equipment (UE) to support subband full duplex (SBFD) operation in transmission time intervals (TTIs) with a transmission direction designated as downlink or flexible; outputting second signaling indicating a TTI for SBFD operation, wherein the TTI has atransmission direction designated as downlink or flexible; and communicating with the UE in the TTI in accordance with the indicated capability.

[0009] Other aspects provide: an apparatus operable, configured, or otherwise adapted to perform any one or more of the aforementioned methods and / or those described elsewhere herein; a non-transitory, computer-readable media comprising instructions that, when executed (e.g., directly, indirectly, after pre-processing, without pre-processing) by one or more processors of an apparatus, cause the apparatus to perform the aforementioned methods as well as those described elsewhere herein; a computer program product embodied on a computer-readable storage medium comprising code for performing the aforementioned methods as well as those described elsewhere herein; and / or an apparatus comprising means for performing the aforementioned methods as well as those described elsewhere herein. By way of example, an apparatus may comprise a processing system, a device with a processing system, or processing systems cooperating over one or more networks.

[0010] The following description and the appended figures set forth certain features for purposes of illustration.BRIEF DESCRIPTION OF DRAWINGS

[0011] The appended figures depict certain features of the various aspects described herein and are not to be considered limiting of the scope of this disclosure.

[0012] FIG. 1 depicts an example wireless communications network.

[0013] FIG. 2 depicts an example disaggregated base station architecture.

[0014] FIG. 3 depicts aspects of an example base station and an example user equipment.

[0015] FIGS. 4A, 4B, 4C, and 4D depict various example aspects of data structures for a wireless communications network.

[0016] FIGs. 5-8 depict different use cases for full-duplex (FD) communications.

[0017] FIGs. 9A, 9B, and 9C depict examples of FD operation at a gNodeB (gNB).

[0018] FIGs. 10A and 10B depict example sub-band full duplex (SBFD) slot configuration.

[0019] FIGs. 11A and 11B depict example SBFD slot configurations.

[0020] FIGs. 12 depicts an example SBFD slot configuration for carrier aggregation (CA).

[0021] FIG. 13 depicts a call flow diagram illustrating an intra-cell scenario, in accordance with certain aspects of the present disclosure.

[0022] FIG. 14 depicts a method for wireless communications.

[0023] FIG. 15 depicts a method for wireless communications.

[0024] FIG. 16 depicts a method for wireless communications.

[0025] FIG. 17 depicts a method for wireless communications.

[0026] FIG. 18 depicts aspects of an example communications device.DETAILED DESCRIPTION

[0027] Aspects of the present disclosure relate to wireless communications, and more particularly, to techniques for subband full duplex (SBFD) wireless communications.

[0028] Half duplex (HD) communication generally refers to a mode of communication where a device only transmits or receives over single communication channel, but does not simultaneously transmit and receive. In a system utilizing a time division duplex (TDD) carrier, different transmission time intervals (e.g., symbols or slots) may be configured as uplink, downlink, or flexible (which could be dynamically indicated as uplink or downlink via a slot format indicator-SFI).

[0029] Full duplex (FD) communication generally refers to a mode of communication where signals can be transmitted and received simultaneously over a single communication channel. In an FD mode, simultaneous transmission between wireless nodes, such as a user equipment (UE) and a base station (BS), may occur. Sub-band full duplex (SBFD) generally refers to a mode where a time division duplex (TDD) carrier is split into uplink and downlink sub-bands to enable simultaneous transmission and reception (on different subbands) in a same slot that consists of multiple symbols.

[0030] In systems utilizing time division duplexing (TDD), the possibility arises of a conflict, where a transmission time interval (TTI), such as a slot or symbol is configured for one direction, while a transmission is scheduled in the opposite direction. For example, a conflict may arise if a downlink transmission is scheduled on a symbolconfigured as an uplink symbol or if an uplink transmission is scheduled on a symbol configured as a downlink symbol.

[0031] Certain systems may utilize a configuration parameter (directi onalCollisionHandling-rl 6) to enable handling of such collisions. In such systems, however, this configuration parameter is typically a per-serving cell parameter that only applies within a same frequency range and cell group. In other words, only the cells configured with directi onalCollisionHandling-r 16 within the same cell group and frequency range are considered for determining the corresponding behavior for each such collision case.

[0032] Unfortunately, conflict handling behavior may not be adequately defined in systems that utilize carrier aggregation (CA) where different cells are configured on different component carriers (CCs). For example, conflict handling may not be adequately defined for SBFD operation where both time and frequency locations of subbands for SBFD operation are known to SBFD aware UEs.

[0033] Aspects of the present disclosure, however, may provide rules for collision handling in SBFD operation, such as Intra-CA based SBFD operation. The various rules provided herein may help define mechanisms for collision handling between downlink reception in a downlink subband CC and UL transmission in an UL subband CC, within an SBFD symbol. This behaviour may result in improved spectral efficiency and improved system performance.Introduction to Wireless Communications Networks

[0034] The techniques and methods described herein may be used for various wireless communications networks. While aspects may be described herein using terminology commonly associated with 3G, 4G, and / or 5G wireless technologies, aspects of the present disclosure may likewise be applicable to other communications systems and standards not explicitly mentioned herein.

[0035] FIG. 1 depicts an example of a wireless communications network 100, in which aspects described herein may be implemented.

[0036] Generally, wireless communications network 100 includes various network entities (alternatively, network elements or network nodes). A network entity is generally a communications device and / or a communications function performed by acommunications device (e.g., a user equipment (UE), a base station (BS), a component of a BS, a server, etc.). For example, various functions of a network as well as various devices associated with and interacting with a network may be considered network entities. Further, wireless communications network 100 includes terrestrial aspects, such as ground-based network entities (e.g., BSs 102), and non-terrestrial aspects, such as satellite 140 and aircraft 145, which may include network entities on-board (e.g., one or more BSs) capable of communicating with other network elements (e.g., terrestrial BSs) and user equipments.

[0037] In the depicted example, wireless communications network 100 includes BSs 102, UEs 104, and one or more core networks, such as an Evolved Packet Core (EPC) 160 and 5G Core (5GC) network 190, which interoperate to provide communications services over various communications links, including wired and wireless links.

[0038] FIG. 1 depicts various example UEs 104, which may more generally include: a cellular phone, smart phone, session initiation protocol (SIP) phone, laptop, personal digital assistant (PDA), satellite radio, global positioning system, multimedia device, video device, digital audio player, camera, game console, tablet, smart device, wearable device, vehicle, electric meter, gas pump, large or small kitchen appliance, healthcare device, implant, sensor / actuator, display, internet of things (loT) devices, always on (AON) devices, edge processing devices, or other similar devices. UEs 104 may also be referred to more generally as a mobile device, a wireless device, a wireless communications device, a station, a mobile station, a subscriber station, a mobile subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a remote device, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, and others.

[0039] BSs 102 wirelessly communicate with (e.g., transmit signals to or receive signals from) UEs 104 via communications links 120. The communications links 120 between BSs 102 and UEs 104 may include uplink (UL) (also referred to as reverse link) transmissions from a UE 104 to a BS 102 and / or downlink (DL) (also referred to as forward link) transmissions from a BS 102 to a UE 104. The communications links 120 may use multiple-input and multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming, and / or transmit diversity in various aspects.

[0040] BSs 102 may generally include: a NodeB, enhanced NodeB (eNB), next generation enhanced NodeB (ng-eNB), next generation NodeB (gNB or gNodeB), access point, base transceiver station, radio base station, radio transceiver, transceiver function, transmission reception point, and / or others. Each of BSs 102 may provide communications coverage for a respective geographic coverage area 110, which may sometimes be referred to as a cell, and which may overlap in some cases (e.g., small cell 102’ may have a coverage area 110’ that overlaps the coverage area 110 of a macro cell). A BS may, for example, provide communications coverage for a macro cell (covering relatively large geographic area), a pico cell (covering relatively smaller geographic area, such as a sports stadium), a femto cell (relatively smaller geographic area (e.g., a home)), and / or other types of cells.

[0041] While BSs 102 are depicted in various aspects as unitary communications devices, BSs 102 may be implemented in various configurations. For example, one or more components of a base station may be disaggregated, including a central unit (CU), one or more distributed units (DUs), one or more radio units (RUs), a Near-Real Time (Near-RT) RAN Intelligent Controller (RIC), or a Non-Real Time (Non-RT) RIC, to name a few examples. In another example, various aspects of a base station may be virtualized. More generally, a base station (e.g., BS 102) may include components that are located at a single physical location or components located at various physical locations. In examples in which a base station includes components that are located at various physical locations, the various components may each perform functions such that, collectively, the various components achieve functionality that is similar to a base station that is located at a single physical location. In some aspects, a base station including components that are located at various physical locations may be referred to as a disaggregated radio access network architecture, such as an Open RAN (O-RAN) or Virtualized RAN (VRAN) architecture. FIG. 2 depicts and describes an example disaggregated base station architecture.

[0042] Different BSs 102 within wireless communications network 100 may also be configured to support different radio access technologies, such as 3G, 4G, and / or 5G. For example, BSs 102 configured for 4G LTE (collectively referred to as Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E- UTRAN)) may interface with the EPC 160 through first backhaul links 132 (e.g., an SI interface). BSs 102 configured for 5G (e.g., 5G NR or Next Generation RAN (NG-RAN))may interface with 5GC 190 through second backhaul links 184. BSs 102 may communicate directly or indirectly (e.g., through the EPC 160 or 5GC 190) with each other over third backhaul links 134 (e.g., X2 interface), which may be wired or wireless.

[0043] Wireless communications network 100 may subdivide the electromagnetic spectrum into various classes, bands, channels, or other features. In some aspects, the subdivision is provided based on wavelength and frequency, where frequency may also be referred to as a carrier, a subcarrier, a frequency channel, a tone, or a subband. For example, 3GPP currently defines Frequency Range 1 (FR1) as including 410 MHz - 7125 MHz, which is often referred to (interchangeably) as “Sub-6 GHz”. Similarly, 3GPP currently defines Frequency Range 2 (FR2) as including 24,250 MHz - 71,000 MHz, which is sometimes referred to (interchangeably) as a “millimeter wave” (“mmW” or “mmWave”). In some cases, FR2 may be further defined in terms of sub-ranges, such as a first sub-range FR2-1 including 24,250 MHz - 52,600 MHz and a second sub-range FR2-2 including 52,600 MHz - 71,000 MHz. A base station configured to communicate using mmWave / near mmWave radio frequency bands (e.g., a mmWave base station such as BS 180) may utilize beamforming (e.g., 182) with a UE (e.g., 104) to improve path loss and range.

[0044] The communications links 120 between BSs 102 and, for example, UEs 104, may be through one or more carriers, which may have different bandwidths (e.g., 5, 10, 15, 20, 100, 400, and / or other MHz), and which may be aggregated in various aspects. Carriers may or may not be adjacent to each other. Allocation of carriers may be asymmetric with respect to DL and UL (e.g., more or fewer carriers may be allocated for DL than for UL).

[0045] Communications using higher frequency bands may have higher path loss and a shorter range compared to lower frequency communications. Accordingly, certain base stations (e.g., 180 in FIG. 1) may utilize beamforming 182 with a UE 104 to improve path loss and range. For example, BS 180 and the UE 104 may each include a plurality of antennas, such as antenna elements, antenna panels, and / or antenna arrays to facilitate the beamforming. In some cases, BS 180 may transmit a beamformed signal to UE 104 in one or more transmit directions 182’. UE 104 may receive the beamformed signal from the BS 180 in one or more receive directions 182”. UE 104 may also transmit a beamformed signal to the BS 180 in one or more transmit directions 182”. BS 180 may also receive the beamformed signal from UE 104 in one or more receive directions 182’.BS 180 and UE 104 may then perform beam training to determine the best receive and transmit directions for each of BS 180 and UE 104. Notably, the transmit and receive directions for BS 180 may or may not be the same. Similarly, the transmit and receive directions for UE 104 may or may not be the same.

[0046] Wireless communications network 100 further includes a Wi-Fi AP 150 in communication with Wi-Fi stations (STAs) 152 via communications links 154 in, for example, a 2.4 GHz and / or 5 GHz unlicensed frequency spectrum.

[0047] Certain UEs 104 may communicate with each other using device-to-device (D2D) communications link 158. D2D communications link 158 may use one or more sidelink channels, such as a physical sidelink broadcast channel (PSBCH), a physical sidelink discovery channel (PSDCH), a physical sidelink shared channel (PSSCH), a physical sidelink control channel (PSCCH), and / or a physical sidelink feedback channel (PSFCH).

[0048] EPC 160 may include various functional components, including: a Mobility Management Entity (MME) 162, other MMEs 164, a Serving Gateway 166, a Multimedia Broadcast Multicast Service (MBMS) Gateway 168, a Broadcast Multicast Service Center (BM-SC) 170, and / or a Packet Data Network (PDN) Gateway 172, such as in the depicted example. MME 162 may be in communication with a Home Subscriber Server (HSS) 174. MME 162 is the control node that processes the signaling between the UEs 104 and the EPC 160. Generally, MME 162 provides bearer and connection management.

[0049] Generally, user Internet protocol (IP) packets are transferred through Serving Gateway 166, which itself is connected to PDN Gateway 172. PDN Gateway 172 provides UE IP address allocation as well as other functions. PDN Gateway 172 and the BM-SC 170 are connected to IP Services 176, which may include, for example, the Internet, an intranet, an IP Multimedia Subsystem (IMS), a Packet Switched (PS) streaming service, and / or other IP services.

[0050] BM-SC 170 may provide functions for MBMS user service provisioning and delivery. BM-SC 170 may serve as an entry point for content provider MBMS transmission, may be used to authorize and initiate MBMS Bearer Services within a public land mobile network (PLMN), and / or may be used to schedule MBMS transmissions. MBMS Gateway 168 may be used to distribute MBMS traffic to the BSs 102 belonging to a Multicast Broadcast Single Frequency Network (MBSFN) areabroadcasting a particular service, and / or may be responsible for session management (start / stop) and for collecting eMBMS related charging information.

[0051] 5GC 190 may include various functional components, including: an Access and Mobility Management Function (AMF) 192, other AMFs 193, a Session Management Function (SMF) 194, and a User Plane Function (UPF) 195. AMF 192 may be in communication with Unified Data Management (UDM) 196.

[0052] AMF 192 is a control node that processes signaling between UEs 104 and 5GC190. AMF 192 provides, for example, quality of service (QoS) flow and session management.

[0053] Internet protocol (IP) packets are transferred through UPF 195, which is connected to the IP Services 197, and which provides UE IP address allocation as well as other functions for 5GC 190. IP Services 197 may include, for example, the Internet, an intranet, an IMS, a PS streaming service, and / or other IP services.

[0054] In various aspects, a network entity or network node can be implemented as an aggregated base station, as a disaggregated base station, a component of a base station, an integrated access and backhaul (IAB) node, a relay node, a sidelink node, to name a few examples.

[0055] FIG. 2 depicts an example disaggregated base station 200 architecture. The disaggregated base station 200 architecture may include one or more central units (CUs) 210 that can communicate directly with a core network 220 via a backhaul link, or indirectly with the core network 220 through one or more disaggregated base station units (such as a Near-Real Time (Near-RT) RAN Intelligent Controller (RIC) 225 via an E2 link, or a Non-Real Time (Non-RT) RIC 215 associated with a Service Management and Orchestration (SMO) Framework 205, or both). A CU 210 may communicate with one or more distributed units (DUs) 230 via respective midhaul links, such as an Fl interface. The DUs 230 may communicate with one or more radio units (RUs) 240 via respective fronthaul links. The RUs 240 may communicate with respective UEs 104 via one or more radio frequency (RF) access links. In some implementations, the UE 104 may be simultaneously served by multiple RUs 240.

[0056] Each of the units, e.g., the CUs 210, the DUs 230, the RUs 240, as well as the Near-RT RICs 225, the Non-RT RICs 215 and the SMO Framework 205, may include one or more interfaces or be coupled to one or more interfaces configured to receive ortransmit signals, data, or information (collectively, signals) via a wired or wireless transmission medium. Each of the units, or an associated processor or controller providing instructions to the communications interfaces of the units, can be configured to communicate with one or more of the other units via the transmission medium. For example, the units can include a wired interface configured to receive or transmit signals over a wired transmission medium to one or more of the other units. Additionally or alternatively, the units can include a wireless interface, which may include a receiver, a transmitter or transceiver (such as a radio frequency (RF) transceiver), configured to receive or transmit signals, or both, over a wireless transmission medium to one or more of the other units.

[0057] In some aspects, the CU 210 may host one or more higher layer control functions. Such control functions can include radio resource control (RRC), packet data convergence protocol (PDCP), service data adaptation protocol (SDAP), or the like. Each control function can be implemented with an interface configured to communicate signals with other control functions hosted by the CU 210. The CU 210 may be configured to handle user plane functionality (e.g., Central Unit - User Plane (CU-UP)), control plane functionality (e.g., Central Unit - Control Plane (CU-CP)), or a combination thereof. In some implementations, the CU 210 can be logically split into one or more CU-UP units and one or more CU-CP units. The CU-UP unit can communicate bidirectionally with the CU-CP unit via an interface, such as the El interface when implemented in an 0-RAN configuration. The CU 210 can be implemented to communicate with the DU 230, as necessary, for network control and signaling.

[0058] The DU 230 may correspond to a logical unit that includes one or more base station functions to control the operation of one or more RUs 240. In some aspects, the DU 230 may host one or more of a radio link control (RLC) layer, a medium access control (MAC) layer, and one or more high physical (PHY) layers (such as modules for forward error correction (FEC) encoding and decoding, scrambling, modulation and demodulation, or the like) depending, at least in part, on a functional split, such as those defined by the 3rdGeneration Partnership Project (3GPP). In some aspects, the DU 230 may further host one or more low PHY layers. Each layer (or module) can be implemented with an interface configured to communicate signals with other layers (and modules) hosted by the DU 230, or with the control functions hosted by the CU 210.

[0059] Lower-layer functionality can be implemented by one or more RUs 240. In some deployments, an RU 240, controlled by a DU 230, may correspond to a logical node that hosts RF processing functions, or low-PHY layer functions (such as performing fast Fourier transform (FFT), inverse FFT (iFFT), digital beamforming, physical random access channel (PRACH) extraction and filtering, or the like), or both, based at least in part on the functional split, such as a lower layer functional split. In such an architecture, the RU(s) 240 can be implemented to handle over the air (OTA) communications with one or more UEs 104. In some implementations, real-time and non-real-time aspects of control and user plane communications with the RU(s) 240 can be controlled by the corresponding DU 230. In some scenarios, this configuration can enable the DU(s) 230 and the CU 210 to be implemented in a cloud-based RAN architecture, such as a vRAN architecture.

[0060] The SMO Framework 205 may be configured to support RAN deployment and provisioning of non-virtualized and virtualized network elements. For non-virtualized network elements, the SMO Framework 205 may be configured to support the deployment of dedicated physical resources for RAN coverage requirements which may be managed via an operations and maintenance interface (such as an 01 interface). For virtualized network elements, the SMO Framework 205 may be configured to interact with a cloud computing platform (such as an open cloud (O-Cloud) 290) to perform network element life cycle management (such as to instantiate virtualized network elements) via a cloud computing platform interface (such as an 02 interface). Such virtualized network elements can include, but are not limited to, CUs 210, DUs 230, RUs 240 and Near-RT RICs 225. In some implementations, the SMO Framework 205 can communicate with a hardware aspect of a 4G RAN, such as an open eNB (O-eNB) 211, via an 01 interface. Additionally, in some implementations, the SMO Framework 205 can communicate directly with one or more RUs 240 via an 01 interface. The SMO Framework 205 also may include a Non-RT RIC 215 configured to support functionality of the SMO Framework 205.

[0061] The Non-RT RIC 215 may be configured to include a logical function that enables non-real-time control and optimization of RAN elements and resources, Artificial Intelligence / Machine Learning (AI / ML) workflows including model training and updates, or policy -based guidance of applications / features in the Near-RT RIC 225. The Non-RT RIC 215 may be coupled to or communicate with (such as via an Al interface)the Near-RT RIC 225. The Near-RT RIC 225 may be configured to include a logical function that enables near-real-time control and optimization of RAN elements and resources via data collection and actions over an interface (such as via an E2 interface) connecting one or more CUs 210, one or more DUs 230, or both, as well as an O-eNB, with the Near-RT RIC 225.

[0062] In some implementations, to generate AI / ML models to be deployed in the Near-RT RIC 225, the Non-RT RIC 215 may receive parameters or external enrichment information from external servers. Such information may be utilized by the Near-RT RIC 225 and may be received at the SMO Framework 205 or the Non-RT RIC 215 from nonnetwork data sources or from network functions. In some examples, the Non-RT RIC 215 or the Near-RT RIC 225 may be configured to tune RAN behavior or performance. For example, the Non-RT RIC 215 may monitor long-term trends and patterns for performance and employ AI / ML models to perform corrective actions through the SMO Framework 205 (such as reconfiguration via 01) or via creation of RAN management policies (such as Al policies).

[0063] FIG. 3 depicts aspects of an example BS 102 and a UE 104.

[0064] Generally, BS 102 includes various processors (e.g., 320, 330, 338, and 340), antennas 334a-t (collectively 334), transceivers 332a-t (collectively 332), which include modulators and demodulators, and other aspects, which enable wireless transmission of data (e.g., data source 312) and wireless reception of data (e.g., data sink 339). For example, BS 102 may send and receive data between BS 102 and UE 104. BS 102 includes controller / processor 340, which may be configured to implement various functions described herein related to wireless communications.

[0065] Generally, UE 104 includes various processors (e.g., 358, 364, 366, and 380), antennas 352a-r (collectively 352), transceivers 354a-r (collectively 354), which include modulators and demodulators, and other aspects, which enable wireless transmission of data (e.g., retrieved from data source 362) and wireless reception of data (e.g., provided to data sink 360). UE 104 includes controller / processor 380, which may be configured to implement various functions described herein related to wireless communications.

[0066] In regards to an example downlink transmission, BS 102 includes a transmit processor 320 that may receive data from a data source 312 and control information from a controller / processor 340. The control information may be for the physical broadcastchannel (PBCH), physical control format indicator channel (PCFICH), physical HARQ indicator channel (PHICH), physical downlink control channel (PDCCH), group common PDCCH (GC PDCCH), and / or others. The data may be for the physical downlink shared channel (PDSCH), in some examples.

[0067] Transmit processor 320 may process (e.g., encode and symbol map) the data and control information to obtain data symbols and control symbols, respectively. Transmit processor 320 may also generate reference symbols, such as for the primary synchronization signal (PSS), secondary synchronization signal (SSS), PBCH demodulation reference signal (DMRS), and channel state information reference signal (CSI-RS).

[0068] Transmit (TX) multiple-input multiple-output (MIMO) processor 330 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, and / or the reference symbols, if applicable, and may provide output symbol streams to the modulators (MODs) in transceivers 332a-332t. Each modulator in transceivers 332a- 332t may process a respective output symbol stream to obtain an output sample stream. Each modulator may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. Downlink signals from the modulators in transceivers 332a-332t may be transmitted via the antennas 334a-334t, respectively.

[0069] In order to receive the downlink transmission, UE 104 includes antennas 352a- 352r that may receive the downlink signals from the BS 102 and may provide received signals to the demodulators (DEMODs) in transceivers 354a-354r, respectively. Each demodulator in transceivers 354a-354r may condition (e.g., filter, amplify, downconvert, and digitize) a respective received signal to obtain input samples. Each demodulator may further process the input samples to obtain received symbols.

[0070] MIMO detector 356 may obtain received symbols from all the demodulators in transceivers 354a-354r, perform MIMO detection on the received symbols if applicable, and provide detected symbols. Receive processor 358 may process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for the UE 104 to a data sink 360, and provide decoded control information to a controller / processor 380.

[0071] In regards to an example uplink transmission, UE 104 further includes a transmit processor 364 that may receive and process data (e.g., for the PUSCH) from a data source 362 and control information (e.g., for the physical uplink control channel (PUCCH)) from the controller / processor 380. Transmit processor 364 may also generate reference symbols for a reference signal (e.g., for the sounding reference signal (SRS)). The symbols from the transmit processor 364 may be precoded by a TX MIMO processor 366 if applicable, further processed by the modulators in transceivers 354a-354r (e.g., for SC-FDM), and transmitted to BS 102.

[0072] At BS 102, the uplink signals from UE 104 may be received by antennas 334a- t, processed by the demodulators in transceivers 332a-332t, detected by a MIMO detector 336 if applicable, and further processed by a receive processor 338 to obtain decoded data and control information sent by UE 104. Receive processor 338 may provide the decoded data to a data sink 339 and the decoded control information to the controller / processor 340.

[0073] Memories 342 and 382 may store data and program codes for BS 102 and UE 104, respectively.

[0074] Scheduler 344 may schedule UEs for data transmission on the downlink and / or uplink.

[0075] In various aspects, BS 102 may be described as transmitting and receiving various types of data associated with the methods described herein. In these contexts, “transmitting” may refer to various mechanisms of outputting data, such as outputting data from data source 312, scheduler 344, memory 342, transmit processor 320, controller / processor 340, TX MIMO processor 330, transceivers 332a-t, antenna 334a-t, and / or other aspects described herein. Similarly, “receiving” may refer to various mechanisms of obtaining data, such as obtaining data from antennas 334a-t, transceivers 332a-t, RX MIMO detector 336, controller / processor 340, receive processor 338, scheduler 344, memory 342, and / or other aspects described herein.

[0076] In various aspects, UE 104 may likewise be described as transmitting and receiving various types of data associated with the methods described herein. In these contexts, “transmitting” may refer to various mechanisms of outputting data, such as outputting data from data source 362, memory 382, transmit processor 364, controller / processor 380, TX MIMO processor 366, transceivers 354a-t, antenna 352a-t,and / or other aspects described herein. Similarly, “receiving” may refer to various mechanisms of obtaining data, such as obtaining data from antennas 352a-t, transceivers 354a-t, RX MIMO detector 356, controller / processor 380, receive processor 358, memory 382, and / or other aspects described herein.

[0077] In some aspects, one or more processors may be configured to perform various operations, such as those associated with the methods described herein, and transmit (output) to or receive (obtain) data from another interface that is configured to transmit or receive, respectively, the data.

[0078] FIGS. 4A, 4B, 4C, and 4D depict aspects of data structures for a wireless communications network, such as wireless communications network 100 of FIG. 1.

[0079] In particular, FIG. 4A is a diagram 400 illustrating an example of a first subframe within a 5G (e.g., 5GNR) frame structure, FIG. 4B is a diagram 430 illustrating an example of DL channels within a 5G subframe, FIG. 4C is a diagram 450 illustrating an example of a second subframe within a 5G frame structure, and FIG. 4D is a diagram 480 illustrating an example of UL channels within a 5G subframe.

[0080] Wireless communications systems may utilize orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) on the uplink and downlink. Such systems may also support half-duplex operation using time division duplexing (TDD). OFDM and single-carrier frequency division multiplexing (SC-FDM) partition the system bandwidth (e.g., as depicted in FIGS. 4B and 4D) into multiple orthogonal subcarriers. Each subcarrier may be modulated with data. Modulation symbols may be sent in the frequency domain with OFDM and / or in the time domain with SC-FDM.

[0081] A wireless communications frame structure may be frequency division duplex (FDD), in which, for a particular set of subcarriers, subframes within the set of subcarriers are dedicated for either DL or UL. Wireless communications frame structures may also be time division duplex (TDD), in which, for a particular set of subcarriers, subframes within the set of subcarriers are dedicated for both DL and UL.

[0082] In FIG. 4A and 4C, the wireless communications frame structure is TDD where D is DL, U is UL, and X is flexible for use between DL / UL. UEs may be configured with a slot format through a received slot format indicator (SFI) (dynamically through DL control information (DCI), or semi-statically / statically through radio resource control (RRC) signaling). In the depicted examples, a 10 ms frame is divided into 10 equallysized 1 ms subframes. Each subframe may include one or more time slots. In some examples, each slot may include 7 or 14 symbols, depending on the slot format. Subframes may also include mini-slots, which generally have fewer symbols than an entire slot. Other wireless communications technologies may have a different frame structure and / or different channels.

[0083] In certain aspects, the number of slots within a subframe is based on a slot configuration and a numerology. For example, for slot configuration 0, different numerol ogies (p) 0 to 6 allow for 1, 2, 4, 8, 16, 32, and 64 slots, respectively, per subframe. For slot configuration 1, different numerol ogies 0 to 2 allow for 2, 4, and 8 slots, respectively, per subframe. Accordingly, for slot configuration 0 and numerology p, there are 14 symbols / slot and 2p slots / subframe. The subcarrier spacing and symbol length / duration are a function of the numerology. The subcarrier spacing may be equal to 2^ X 15 kHz, where p is the numerology 0 to 6. As such, the numerology p = 0 has a subcarrier spacing of 15 kHz and the numerology p = 6 has a subcarrier spacing of 960 kHz. The symbol length / duration is inversely related to the subcarrier spacing. FIGS. 4A, 4B, 4C, and 4D provide an example of slot configuration 0 with 14 symbols per slot and numerology p = 2 with 4 slots per subframe. The slot duration is 0.25 ms, the subcarrier spacing is 60 kHz, and the symbol duration is approximately 16.67 ps.

[0084] As depicted in FIGS. 4A, 4B, 4C, and 4D, a resource grid may be used to represent the frame structure. Each time slot includes a resource block (RB) (also referred to as physical RBs (PRBs)) that extends, for example, 12 consecutive subcarriers. The resource grid is divided into multiple resource elements (REs). The number of bits carried by each RE depends on the modulation scheme.

[0085] As illustrated in FIG. 4A, some of the REs carry reference (pilot) signals (RS) for a UE (e.g., UE 104 of FIGS. 1 and 3). The RS may include demodulation RS (DMRS) and / or channel state information reference signals (CSI-RS) for channel estimation at the UE. The RS may also include beam measurement RS (BRS), beam refinement RS (BRRS), and / or phase tracking RS (PT-RS).

[0086] FIG. 4B illustrates an example of various DL channels within a subframe of a frame. The physical downlink control channel (PDCCH) carries DCI within one or more control channel elements (CCEs), each CCE including, for example, nine RE groups (REGs), each REG including, for example, four consecutive REs in an OFDM symbol.

[0087] A primary synchronization signal (PSS) may be within symbol 2 of particular subframes of a frame. The PSS is used by a UE (e.g., 104 of FIGS. 1 and 3) to determine subframe / symbol timing and a physical layer identity.

[0088] A secondary synchronization signal (SSS) may be within symbol 4 of particular subframes of a frame. The SSS is used by a UE to determine a physical layer cell identity group number and radio frame timing.

[0089] Based on the physical layer identity and the physical layer cell identity group number, the UE can determine a physical cell identifier (PCI). Based on the PCI, the UE can determine the locations of the aforementioned DMRS. The physical broadcast channel (PBCH), which carries a master information block (MIB), may be logically grouped with the PSS and SSS to form a synchronization signal (SS) / PBCH block. The MIB provides a number of RBs in the system bandwidth and a system frame number (SFN). The physical downlink shared channel (PDSCH) carries user data, broadcast system information not transmitted through the PBCH such as system information blocks (SIBs), and / or paging messages.

[0090] As illustrated in FIG. 4C, some of the REs carry DMRS (indicated as R for one particular configuration, but other DMRS configurations are possible) for channel estimation at the base station. The UE may transmit DMRS for the PUCCH and DMRS for the PUSCH. The PUSCH DMRS may be transmitted, for example, in the first one or two symbols of the PUSCH. The PUCCH DMRS may be transmitted in different configurations depending on whether short or long PUCCHs are transmitted and depending on the particular PUCCH format used. UE 104 may transmit sounding reference signals (SRS). The SRS may be transmitted, for example, in the last symbol of a subframe. The SRS may have a comb structure, and a UE may transmit SRS on one of the combs. The SRS may be used by a base station for channel quality estimation to enable frequency-dependent scheduling on the UL.

[0091] FIG. 4D illustrates an example of various UL channels within a subframe of a frame. The PUCCH may be located as indicated in one configuration. The PUCCH carries uplink control information (UCI), such as scheduling requests, a channel quality indicator (CQI), a precoding matrix indicator (PMI), a rank indicator (RI), and HARQ ACK / NACK feedback. The PUSCH carries data, and may additionally be used to carry a buffer status report (BSR), a power headroom report (PHR), and / or UCI.Overview of Full-Duplex (FD) Systems

[0092] Full-duplex (FD) allows for simultaneous transmission between nodes (e.g., a user equipment (UE) and a base station (BS)). In a half-duplex (HD) system, communication flows in one direction at a time.

[0093] There are various motivations for utilizing FD communications, for example, for simultaneous uplink (UL) / downlink (DL) transmissions in Frequency Range 2 (FR2). In some cases, FD capability may enable flexible time division duplexing (TDD) capability, and may be present at either a base station (BS) or a UE or both. For example, at the UE, UL transmissions may be sent from one antenna panel (e.g., or multiple antenna panels) and DL receptions may be performed at another antenna panel. In another example, at a gNodeB (gNB), the UL transmissions may be from one panel and the DL receptions may be performed at another panel.

[0094] The FD capability may be conditional on a beam separation (e.g., selfinterference between DL and UL, clutter echo, etc.). The FD capability may mean that the UE or the gNB is able to use frequency division multiplexing (FDM) or spatial division multiplexing (SDM) on slots conventionally reserved for UL only or DL only slots (or flexible slots that may be dynamically indicated as either UL or DL).

[0095] The potential benefits of the FD communications include latency reduction (e.g., it may be possible to receive DL signals in what would be considered UL only slots, which can enable latency savings), coverage enhancement, spectrum efficiency enhancements (e.g., per cell and / or per UE), and / or overall more efficient resource utilization.

[0096] FIGs. 5-7 illustrate example use cases for FD communications. FIG. 8 summarizes certain possible features of these use cases.

[0097] Diagram 500 of FIG. 5 illustrates a first use case (e.g., Use Case 1) for FD communications. As illustrated, one UE 104 simultaneously communicates with a first transmitter receiver point (TRP 1) on DL, while transmitting to a second TRP on UL. For this use case, FD is disabled at a gNB (i.e., TRP 1, TRP 2) and enabled at the UE.

[0098] Diagram 600 of FIG. 6 illustrates a second use case (e.g., Use Case 2) for FD communications. As illustrated, one gNB 102 simultaneously communicates with a first UE (UE 1) on DL, while communicating with a second UE (UE 2) on UL. For this use case, FD is enabled at the gNB and disabled at the UEs. Use cases with the FD enabledat the gNB and disabled at the UEs may be suitable for integrated access and backhaul (IAB) applications as well (e.g., as illustrated in a table 800 of FIG. 8).

[0099] Diagram 700 of FIG. 7 illustrates a third use case (e.g., Use Case 3) for FD communications. As illustrated, a UE 104 simultaneously communicates with a gNB 102, transmitting on UL while receiving on DL. For this use case, FD is enabled at both the gNB and the UE.Overview of Sub-band Full Duplex (SBFD)

[0100] As compared to older communication standards, spectrum options for 5G new radio (NR) are considerably expanded. For example, a frequency range 2 (FR2) band extends from approximately 24 GHz to 60 GHz. Since the wavelength decreases as the frequency increases, the FR2 band is denoted as a millimeter wave band due to its relatively-small wavelengths. In light of this relatively short wavelength, the transmitted radio frequency (RF) signals in the FR2 band behave somewhat like visible light. Thus, just like light, millimeter-wave signals are readily shadowed by buildings and other obstacles. In addition, the received power per unit area of antenna element decreases as the frequency increases. For example, a patch antenna element is typically a fraction of the operating wavelength (e.g., one-half of the wavelength) in width and length. As the wavelength decreases (and thus the size of the antenna element decreases), it may thus be seen that the signal energy received at the corresponding antenna element decreases. Millimeter-wave cellular networks will generally require a relatively-large number of base stations (BSs) due to the issues of shadowing and decreased received signal strength. A cellular provider must typically rent the real estate for the BSs such that widespread coverage for a millimeter-wave cellular network may become very costly.

[0101] As compared to the challenges of FR2, the electromagnetic properties of radio wave propagation in the sub-6 GHz bands are more accommodating. For example, the 5G NR frequency range 1 (FR1) band extends from approximately 0.4 GHz to 7 GHz. At these lower frequencies, the transmitted RF signals tend to refract around obstacles such as buildings so that the issues of shadowing are reduced. In addition, the larger size for each antenna element means that a FR1 antenna element intercepts more signal energy as compared to an FR2 antenna element. Thus, just as was established for older networks, a 5GNR cellular network operating in the FR1 band will not require an inordinate amountof BSs. Given the favorable properties of the lower frequency bands, the sub-6 GHz bands are often denoted as “beachfront” bands due to their desirability.

[0102] One issue with operation in the sub-6 GHz bands is that there is only so much bandwidth available. For this reason, Federal Communications Commission regulates the airwaves and conducts auctions for the limited bandwidth in the FR1 band. Given this limited bandwidth, it is challenging for a cellular provider to enable the high data rates that would be more readily achieved in the FR2 band. To meet these challenges, a “subband full duplex” (SBFD) network architecture is implemented, which is quite advantageous as it offers users the high data rates that would otherwise require usage of the FR2 band. The SBFD network architecture described herein provides the high data rates in the FR1 band, and thus lowers costs due to the smaller number of BSs per given area of coverage that may be achieved in the FR1 band as compared to the FR2 band.

[0103] Typically, each one millisecond (ms) subframe may consist of one or multiple adjacent slots. For example, one subframe includes four slots. In a four-slot structure, first two slots may be downlink (DL) slots whereas a final one of the fours slots is an uplink (UL) slot. The third slot is a special slot in which some symbols may be used for UL transmissions and others for DL transmissions. The resulting UL and DL traffic is thus time division duplexed (TDD) as arranged by the dedicated slots and as arranged by the symbol assignment in the special slot. Since the UL has only a single dedicated slot, UL communication may suffer from excessive latency since a user equipment (UE) is restricted to transmitting in the single dedicated UL slot and in the resource allocations within the special slot. Since there is only one dedicated UL slot in the repeating four-slot structure, the resulting latency can be problematic, particularly for low-latency applications such as vehicle-to-vehicle communication. In addition, the energy for the UL communication is limited by its single dedicated slot.

[0104] To reduce uplink latency and increase the energy for the UL transmissions, SBFD mode may be implemented. The SBFD mode is a duplex mode with a TDD carrier split into sub-bands to enable simultaneous transmission and reception in same slots. For example, in the SBFD mode, some slots are modified as SBFD slots to support frequency duplexing for simultaneous UL and DL transmissions. Some slots may remain as legacy TDD slots where one slot is still dedicated to DL and another slot dedicated to UL. In one example four-slot structure, in the SBFD mode, the second and third slots may be SBFD slots modified to support frequency duplexing for simultaneous UL and DLtransmissions. The first slot and the fourth slot may remain as legacy TDD slots such that the first slot is still dedicated to DL and the fourth slot dedicated to UL. In other examples, any slot may be used in the SBFD mode.

[0105] In the sub-6 GHz spectrum, the relatively-limited separation between antennas on a device will lead to substantial self-interference should the device engage in a simultaneous UL and DL transmission. In some cases, the frequency duplexing in the SBFD slots may be practiced by a BS transceiver.

[0106] For example, diagram 900 of FIG. 9A depicts full-duplex (FD) operation at a gNodeB (gNB) 102. An antenna system for the gNB is subdivided into a first antenna array that is separated from a second antenna array by an insulating distance such as, for example, 10 to 30 cm. As illustrated in FIG. 9B, during the SBFD operation, one of the antenna arrays transmits (e.g., to a first UE (UE1)) while the other antenna array is receiving (e.g., from a second UE (UE2)). As illustrated in FIG. 9C, CLI may occur in DL MU-MIMO, where a DL transmission from UE1 potentially interferes with reception by UE2, as well as UL MU-MIMO, where an UL transmission from UE1 potentially interferes with an UL transmission from UE2. In a FD scenario, in addition to CLI, UEs may be subject to self-interference and / or clutter.

[0107] The self-interference problem is partially addressed by a physical separation between the antenna arrays of the gNB. To provide additional isolation, a conducting shield between the antenna arrays of the gNB may also be implemented. It will be appreciated, however, that frequency duplexing may also be practiced by the device (or more generally, a UE) should the device practice sufficient self-interference cancellation. In other cases, however, the UE may be limited to half-duplex (HD) transmission such that the UEs antenna array is entirely dedicated to just transmitting or to just receiving in respective slots.

[0108] Example SBFD slots are depicted in FIG. 10A and FIG. 10B. For example, FIG. 10A depicts SBFD slot 1000 and FIG. 10B depicts SBFD slot 1010. Note that neither the UL nor the DL in the SBFD slots 1000, 1010 may occupy an entire frequency resource range (e.g., a frequency band) for these SBFD slots.

[0109] As depicted in FIG. 10A, the UL occupies a central sub-band 1004 in the frequency band for the SBFD slot 1000, while the DL occupies upper and lower sub-bands as shown at 1002. In the example of FIG. 10B, SBFD slot 1010 includes only one DL subband 1002.

[0110] In some cases, the sub-bands may be separated by a guard band. The DL also occupies an upper sub-band in the frequency band and extends from a greatest frequency for the UL central sub-band to a greatest frequency for the frequency band. In one example, the UL central sub-band may be symmetric about a center frequency for the SBFD slot 1000. In such example, the bandwidth for the DL lower sub-band and the DL upper sub-band would be equal. However, in other examples, the DL lower sub-band bandwidth may be different from the bandwidth for the DL upper sub-band. In some examples, the DL upper and lower sub-bands may each have the bandwidth that may vary as 10 MHz, 20 MHz, 30 MHz or 40 MHz depending upon a DL data rate.[OHl] The use of the SBFD slot is advantageous with regard to minimizing or reducing UE-to-UE interference and transmi t-to-receive self-interference at a BS. In some cases, the use of the SBFD slot may also enhance system capacity, improve resource utilization and spectrum efficiency (e.g., by enabling flexible and dynamic UL / DL resource adaption according to UL / DL traffic in a robust manner).

[0112] In some cases, SBFD operation may be enabled in symbols configured as flexible in TDD-UL-DL-ConfigCommon. For example, for SBFD operation in a symbol configured as flexible in TDD-UL-DL-ConfigCommon, various options may be considered for SBFD aware UEs.

[0113] Referring to FIG. 11 A, according to a first option, UL transmissions may be allowed within an UL subband 1106 in the symbol, while UL transmissions outside UL subband 1106 may not be allowed (e.g., prohibited). Frequency locations of DL subband(s) 1104 may be known to an SBFD aware UE. Therefore, DL receptions within DL subband(s) 1104 may be allowed in the symbol. Whether or not DL receptions are allowed outside DL subband(s) may also be considered.

[0114] Referring to FIG. 11B, according to a second option, UL transmissions within UL subband 1106 may be allowed in the symbol. The RBs (in subbands 1110) outside the UL subband 1106 can be used as either as UL or DL excluding guardband(s) if used, in the symbol from gNB’s perspective, and the transmission direction for all those RBs is the same. Various types of SBFD aware UE behaviours may be considered, as well as whether or not there should be signalling of guardband(s) location(s), and whether or notthe symbol can be converted to a DL-only symbol. Frequency locations of DL subband(s) may be known to the SBFD aware UE, such that DL receptions within DL subband(s) may be allowed in the symbol.

[0115] UL transmissions may be within an active UL BWP and DL receptions may be within an active DL BWP in the symbol for both options described above. For all RBs outside the UL subband, UE cannot use separate RBs for DL and UL simultaneously

[0116] In some cases, SBFD operation at a gNB for UEs may be implemented under various assumptions. These assumptions may include, for example, that SBFD operation is within a TDD carrier, an SBFD scheme is within a single configured DL and UL BWP pair with aligned center frequencies, and up to one UL subband may be configured for SBFD operation in an SBFD symbol within a TDD carrier. In some cases, for UEs in an RRC CONNECTED state, both time and frequency locations of subbands for SBFD operation may be known to SBFD aware UEs.

[0117] Aspects of the present disclosure may define certain UE behaviours for SBFD aware UEs based on the time and frequency locations of subbands for SBFD operation. In such cases, non-SBFD aware UEs, including legacy UEs, and SBFD aware UEs may coexist in cells with SBFD operation at the gNB side. In addition to the indication of time and frequency domain locations of SBFD subbands to UEs, UE transmission, reception and measurement behaviours and procedures in SBFD symbols and / or non-SBFD symbols may be proposed.Aspects Related to Confliction Handling for SBFD

[0118] Aspects of the present disclosure relate to wireless communications, and more particularly, to techniques for handling directional conflicts in subband full duplex (SBFD) wireless communications.

[0119] As noted above, in systems utilizing time division duplexing (TDD), the possibility arises of a conflict, where a transmission time interval (TTI), such as a slot or symbol is configured for one direction, while a transmission is scheduled in the opposite direction. For example, a conflict may arise if a downlink transmission is scheduled on a symbol configured as an uplink symbol or if an uplink transmission is scheduled on a symbol configured as a downlink symbol.

[0120] Unfortunately, conflict handling behavior may not be adequately defined in systems that utilize carrier aggregation (CA) where different cells are configured on different component carriers (CCs). For example, conflict handling may not be adequately defined for SBFD operation where both time and frequency locations of subbands for SBFD operation are known to SBFD aware UEs.

[0121] Aspects of the present disclosure, however, may provide rules for collision handling in SBFD operation, such as Intra-CA based SBFD operation. The various rules provided herein may help define mechanisms for collision handling between downlink reception in a downlink subband CC and UL transmission in an UL subband CC, within an SBFD symbol. This behaviour may result in improved spectral efficiency and improved system performance.

[0122] The mechanisms proposed herein may be used in scenarios where intra-CA based SBFD operation is configured (e.g., for FR2 bands). The mechanisms propose rules for collision handling between DL reception in DL subband CC and UL transmission in UL subband CC in an SBFD symbol. The mechanisms may effectively enhance direction collision handling rules to support intra-CA based SBFD operation.

[0123] The techniques proposed herein may be understood with reference to the call flow diagram 1300 of FIG. 13. In some aspects, the UE shown in FIG. 13 may be examples of the UE 104 depicted and described with respect to FIG. 1 and 3. Similarly, the network entities shown in FIG. 13 may be example of the BS 102 (e.g., a gNB) depicted and described with respect to FIG. 1 and 3 or a disaggregated base station depicted and described with respect to FIG. 2.

[0124] As illustrated at 1302, a serving cell may transmit signaling indicating at least one symbol is configured as a subband full duplex (SBFD) symbol with at least one downlink component carrier (CC) and at least one uplink CC.

[0125] As illustrated at 1304, the serving cell may transmit second signaling indicating that directional collision handling is enabled for a set of one or more serving cells associated with the at least one downlink CC and the at least one uplink CC.

[0126] As indicated at 1306, the UE may then communicate with one or more serving cells based on a symbol direction for the at least one SBFD symbol, wherein the symbol direction is based on one or more rules.

[0127] Rules proposed herein may determine symbol direction definitions in a manner that accounts for semi-static configured SBFD symbols on what, in previous (legacy) systems were downlink (D) or flexible (F) symbols. Such rules may consider that, with intra-CA based SBFD operation, uplink transmissions may be performed in an uplink subband component carrier (UL SB CC), while downlink transmissions may be performed in one or more downlink subband component carriers (DL SB CCs).

[0128] The following rule may be used for symbol direction that accommodate these cases for gNB SBFD may be determined as follows, for a UE that is configured with multiple serving cells and has collision handling enabled (e.g., the UE is provided with directionalCollisionHandling-rl6 = 'enabled' for a set of serving cell(s) among the configured multiple serving cells). The UE may also indicate support of half-DuplexTDD- CA-SameSCS-rl6 capability, and may not be configured to monitor PDCCH for detection of DCI format 2 0 on any of the multiple serving cells. In such cases, the UE may determine a reference cell for a symbol (e.g., to use as a reference for direction determination purposes) as an active cell with the smallest cell index among the configured multiple serving cells (e.g., if the UE is not capable of simultaneous transmission and reception as indicated by simultaneousRxTxInterBandCA among the multiple serving cells) or the cells of each band respectively (if the UE is capable of simultaneous transmission and reception by simultaneousRxTxInterBandCA for the configured multiple serving cells),

[0129] The direction may be determined as 1) downlink, or uplink, as indicated by tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated 2) uplink, if the symbol is flexible and the UE is configured to transmit SRS, PUCCH, PUSCH, or PRACH on the symbol; or downlink, if the symbol is flexible and the UE is configured to receive PDCCH, PDSCH or CSI-RS on the symbol.

[0130] According to certain aspects of the present disclosure, the symbol may be configured as: 1) uplink if the symbol is indicated as an SBFD symbol and the UE is configured to transmit SRS, PUCCH, PUSCH, or PRACH on the symbol; or downlink, if the symbol is indicated as a SBFD symbol and the UE is configured to transmit a PDCCH, PDSCH, or CSI-RS reception on the symbol.

[0131] If another cell among the cells configured with directionalCollisionHandling- r!6 operates in the same frequency band as the reference cell, the UE may not expectcertain conditions (e.g., and may consider such configurations as valid). For example, the UE may not expect a symbol to be indicated as downlink or uplink on the reference cell and as uplink or downlink on another cell, respectively (e.g., by tdd-UL-DL- ConfigurationCommon or by tdd-UL-DL-ConfigurationDedicated) or for tdd-UL-DL- ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated to indicate a symbol as downlink on the reference cell, or to indicate a symbol as a SBFD symbol and the UE is configured to transmit a PDCCH, PDSCH, or CSI-RS reception on the reference cell or on the downlink subband cell(s) of SBFD operation and to detect a DCI format scheduling a transmission on the symbol on another cell. The UE may also not expect to be configured by higher layers to receive PDCCH, PDSCH, or CSI-RS on a flexible symbol on the reference cell or indicated to be a SBFD symbol but configured by higher layers to receive PDCCH, PDSCH, or CSI-RS on the reference cell or on the downlink subband cell(s) of SBFD operation and to detect a DCI format scheduling a transmission on the symbol on another cell.

[0132] According to certain aspects of the present disclosure, for semi-statically configured SBFD symbols (e.g., on legacy D or F symbols), the symbol direction definition may account for cases operating in different frequency bands (e.g., regardless of whether the reference cell and another cell operate in same or different frequency bands).

[0133] For example, if the reference cell and another cell among the cells configured with directionalCollisionHandling-rl6 operate in different frequency bands, the UE may assume that, for a symbol as flexible or that an SBFD symbol that the UE can transmit or receive on, the UE is not required to receive higher layer configured PDCCH, PDSCH, or CSI-RS and the UE may not be expected to transmit higher layer configured SRS, PUCCH, PUSCH, or PRACH, when tdd-UL-DL-ConfigurationCommon or tdd-UL-DL- ConfigurationDedicated indicates the symbol as downlink or uplink on another cell and as uplink or downlink for the reference cell, respectively.

[0134] The UE may also not expect to transmit a signal / channel scheduled by a DCI format on a symbol of another cell, when the symbol is indicated as downlink by tdd-UL- DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated for the reference cell or if a symbol is indicated as a SBFD symbol and the UE is configured to receive a PDCCH, PDSCH, or CSI-RS reception on the symbol.

[0135] The UE may also not be required to receive a higher layer configured PDCCH, PDSCH, or CSI-RS on flexible symbols on the reference cell in a set of symbols or if a symbol is indicated as a SBFD symbol and the UE is not required to receive a higher layer configured PDCCH, PDSCH, or CSI-RS reception on the symbol, if the UE detects a DCI format scheduling a transmission on one or more symbols in the set of symbols on another cell.

[0136] According to certain aspects, rules may be proposed that account for the possibility that, with intra-CA based SBFD operation, uplink can happen in UL SB CC, and downlink can happen in DL SB CC(s). Therefore, updates to certain UE behaviors (e.g., described below) may be beneficial to account for those cases when gNB SBFD operation is configured.

[0137] According to such rules, the UE may not expect tdd-UL-DL- ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated for the reference cell to indicate a symbol as uplink and to detect a DCI format scheduling a reception on the symbol on another cell. In this case, the Uplink direction may be defined by tdd-UL-DL- ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated for the reference cell or if a symbol indicated as a SBFD symbol but with a symbol corresponding to transmit SRS, PUCCH, PUSCH, or PRACH that is configured by higher layers on the reference cell or on the uplink (subband) cell(s) of SBFD operation.

[0138] The UE may not expect to be configured by higher layers to transmit SRS, PUCCH, PUSCH, or PRACH on a flexible symbol on the reference cell and to detect a DCI format scheduling a reception on the symbol on another cell.

[0139] The UE may not transmit a PUCCH, PUSCH or PRACH that is configured by higher layers on a set of symbols on another cell if at least one symbol from the set of symbols is indicated as downlink. In this case, downlink direction may be defined by tdd- UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated or may be a symbol corresponding to a PDCCH, PDSCH, or CSI-RS reception that is configured by higher layers on the reference cell or is a symbol indicated as a SBFD symbol but with a symbol corresponding to a PDCCH, PDSCH, or CSI-RS reception that is configured by higher layers on the reference cell or on the downlink (subband cell(s)) of SBFD operation.

[0140] The UE may not transmit an SRS that is configured by higher layers on a set of symbols on another cell if the set of symbols is indicated as downlink. In this case, downlink direction may defined by tdd-UL-DL-ConfigurationCommon or tdd-UL-DL- ConfigurationDedicated or is a symbol corresponding to a PDCCH, PDSCH, or CSI-RS reception that is configured by higher layers on the reference cell or is a symbol indicated as a SBFD symbol but with a symbol corresponding to a PDCCH, PDSCH, or CSI-RS reception that is configured by higher layers on the reference cell or on the downlink subband cell(s) of SBFD operation.

[0141] The UE may not receive a PDCCH, PDSCH or CSI-RS that is configured by higher layers on a set of symbols on another cell if at least one symbol from the set of symbols is indicated as uplink. Uplink direction is defined by tdd-UL-DL- ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated for the reference cell or is a symbol indicated as a SBFD symbol but with a symbol corresponding to transmit SRS, PUCCH, PUSCH, or PRACH that is configured by higher layers on the reference cell or on the uplink (subband) cell(s) of SBFD operation.

[0142] The UE may assume that a symbol is flexible for transmission or reception by tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated indicated to be an SBFD symbol and without being configured by higher layers to transmit SRS, PUCCH, PUSCH, or PRACH or to receive PDCCH, PDSCH, or CSI-RS on the reference cell or on the associated (subband) cell(s) of SBFD operation.

[0143] After the UE applies the procedures described above for directional collision handling within the set of cells that have been configured with directionalCollisionHandling-r 16. the UE may not expect any directional collision among the serving cells that the UE is not capable of simultaneous transmission and reception.

[0144] According to certain aspects, a UE may indicate (e.g., report) its UE capability regarding SBFD operations configured on D or F symbols. As described above with reference to FIGs. HA and 11B, there two alternatives to configure SBFD symbols or slots on legacy Flexible (F) symbols or slots. For a new SBFD aware UE, a new UE capability may be defined to indicate whether a UE supports for gNB to configure SBFD symbols or slots on legacy Flexible symbols or slots.

[0145] According to certain aspects, for the second option described above (with reference to FIG. 11B), a new UE capability may be defined for an SBFD aware UE to indicate it supports SBFD operation in symbols configured as flexible in TDD-UL-DL- ConfigCommon. In this case, the gNB may only provide the UE with an indication of the UL subband frequency location. The RBs outside the UL subband may be used as either UL, or DL excluding guardband(s), if guardbands are used. An SBFD aware UE may need an additional algorithm or processing to support such a UE feature. In addition, there could be signaling provided to further indicate the RBs outside the UL subband is actually used as either UL, or DL in the F symbol. Therefore, a new UE capability may be provided to indicate whether a UE supports the second option of SBFD operation in symbols configured as flexible in TDD-UL-DL-ConfigCommon.

[0146] In some cases, both options described above (with reference to FIGs. 11A and 11B) may be implemented. This case may be similar to the case described above. A new UE capability may be implemented to indicate whether a UE supports the second option described above for SBFD operation in symbols configured as flexible in TDD-UL-DL- ConfigCommon (as described with reference to FIG. 11B). In some cases, the first option (described with reference to FIG. 11 A) may be used as a default UE feature to be supported.

[0147] In some cases, if only the first option (described with reference to FIG. 11 A) is supported, then no new UE capability may be needed. In this case, all SBFD aware UEs may support this first option with SBFD operation in symbols configured as flexible in TDD-UL-DL-ConfigCommon with D / U / D or D / U configuration. Same UE behavior as SBFD operation in symbols configured as downlink in TDD-UL-DL-ConfigCommon. As an alternative, a new UE capability may be defined for SBFD aware UE to support the first option of SBFD operation in symbols configured as flexible in TDD-UL-DL- ConfigCommon.Example Operations

[0148] FIG. 14 shows an example of a method 1400 of wireless communications at a user equipment (UE), such as a UE 104 of FIGS. 1 and 3.

[0149] Method 1400 begins at step 1405 with obtaining first signaling indicating at least one symbol is configured as a subband full duplex (SBFD) symbol with at least one downlink component carrier (CC) and at least one uplink CC. In some cases, theoperations of this step refer to, or may be performed by, circuitry for obtaining and / or code for obtaining as described with reference to FIG. 18.

[0150] Method 1400 then proceeds to step 1410 with obtaining second signaling indicating that directional collision handling is enabled for a set of one or more serving cells associated with the at least one downlink CC and the at least one uplink CC. In some cases, the operations of this step refer to, or may be performed by, circuitry for obtaining and / or code for obtaining as described with reference to FIG. 18.

[0151] Method 1400 then proceeds to step 1415 with communicating with the one or more serving cells based on a symbol direction for the at least one SBFD symbol, wherein the symbol direction is based on one or more rules. In some cases, the operations of this step refer to, or may be performed by, circuitry for communicating and / or code for communicating as described with reference to FIG. 18.

[0152] In some aspects, at least one of the one or more rules indicate the symbol direction for the SBFD symbol as uplink if the UE is configured, via higher layer signaling, to transmit an uplink signal on the SBFD symbol.

[0153] In some aspects, the uplink signal comprises at least one of: a sounding reference signal (SRS), physical uplink control channel (PUCCH), physical uplink shared channel (PUSCH), or physical random access channel (PRACH).

[0154] In some aspects, at least one of the one or more rules determines the symbol direction for the at least one SBFD symbol as uplink if the UE is configured to transmit the uplink signal in the SBFD symbol via at least one of a reference cell or another cell configured for SBFD operation.

[0155] In some aspects, at least one of the one or more rules determines the symbol direction for the at least one SBFD symbol as downlink if the UE is configured, via higher layer signaling, to receive a downlink signal on the SBFD symbol.

[0156] In some aspects, the downlink signal comprises at least one of: a physical downlink control channel (PDCCH), physical downlink shared channel (PDSCH), or channel state information reference signal (CSI-RS).

[0157] In some aspects, at least one of the one or more rules determines the symbol direction for the at least one SBFD symbol as downlink if the UE is configured to receivethe downlink signal on the SBFD symbol via at least one of a reference cell or another cell configured for SBFD operation.

[0158] In some aspects, according to the one or more rules, the UE ignores a configuration if: the symbol direction for the at least one SBFD symbol is to be downlink for at least a reference cell; and the UE is configured, via higher layer signaling, to transmit an uplink signal on the SBFD symbol associated with the reference cell or another cell.

[0159] In some aspects, according to the one or more rules, the UE considers a configuration invalid if: the symbol direction for the at least one SBFD symbol is to be uplink for at least a reference cell; and the UE is configured, via higher layer signaling, to receive a downlink signal on the SBFD symbol associated with the reference cell or another cell.

[0160] In some aspects, according to the one or more rules, at least one of: the UE is not required to receive a scheduled downlink signal and not expected to transmit a scheduled uplink signal, if the symbol direction for the at least one SBFD symbol is to be uplink for a first cell and downlink for a second cell; the UE ignores a configuration if the at least one SBFD symbol is indicated as downlink for a reference cell, the configuration schedules the UE to transmit an uplink signal via downlink control information (DCI) via another cell, and the UE is scheduled to receive a downlink signal on the at least one SBFD symbol; or the UE is not required to receive a scheduled downlink signal via a reference cell, if the UE detects downlink control information (DCI) scheduling a transmission on the at least one SBFD symbol associated with another cell.

[0161] In some aspects, the reference cell and the other cell operate in same frequency bands.

[0162] In some aspects, the reference cell and the other cell operate in different frequency bands.

[0163] In some aspects, the symbol direction of the at least one SBFD symbol is considered as: uplink if the at least one SBFD symbol is configured as uplink for a reference cell or if the UE is scheduled to transmit an uplink signal on the at least one SBFD symbol via the reference cell or another cell; and downlink if the at least one SBFDsymbol is configured as uplink for a reference cell or if the UE is scheduled to receive a downlink signal on the at least one SBFD symbol via the reference cell or another cell.

[0164] In some aspects, according to the one or more rules, at least one of: the UE does not expect to be scheduled for reception on the at least one SBFD symbol via the other cell if the symbol direction of the at least one SBFD symbol is considered as uplink.

[0165] In some aspects, according to the one or more rules, at least one of: the UE refrains from transmitting an uplink signal scheduled for transmission on the at least one SBFD symbol via the other cell if the symbol direction of the at least one SBFD symbol is considered as uplink.

[0166] In some aspects, the symbol direction of the at least one SBFD symbol is considered as flexible for transmission or reception if the at least one SBFD symbol is configured as flexible via network signaling and the UE is not scheduled to transmit an uplink signal or receive a downlink signal on the at least one SBFD symbol via the reference cell or another cell.

[0167] In one aspect, method 1400, or any aspect related to it, may be performed by an apparatus, such as communications device 1800 of FIG. 18, which includes various components operable, configured, or adapted to perform the method 1400. Communications device 1800 is described below in further detail.

[0168] Note that FIG. 14 is just one example of a method, and other methods including fewer, additional, or alternative steps are possible consistent with this disclosure.

[0169] FIG. 15 shows an example of a method 1500 of wireless communications at a network entity, such as a BS 102 of FIGS. 1 and 3, or a disaggregated base station as discussed with respect to FIG. 2.

[0170] Method 1500 begins at step 1505 with outputting first signaling indicating at least one symbol is configured as a subband full duplex (SBFD) symbol with at least one downlink component carrier (CC) and at least one uplink CC. In some cases, the operations of this step refer to, or may be performed by, circuitry for outputting and / or code for outputting as described with reference to FIG. 18.

[0171] Method 1500 then proceeds to step 1510 with outputting second signaling indicating that directional collision handling is enabled for a set of one or more servingcells associated with the at least one downlink CC and the at least one uplink CC. In some cases, the operations of this step refer to, or may be performed by, circuitry for outputting and / or code for outputting as described with reference to FIG. 18.

[0172] Method 1500 then proceeds to step 1515 with communicating with at least one user equipment (UE) based on a symbol direction for the at least one SBFD symbol, wherein the symbol direction is based on one or more rules. In some cases, the operations of this step refer to, or may be performed by, circuitry for communicating and / or code for communicating as described with reference to FIG. 18.

[0173] In some aspects, at least one of the one or more rules indicate the symbol direction for the SBFD symbol as uplink if the UE is configured, via higher layer signaling, to transmit an uplink signal on the SBFD symbol.

[0174] In some aspects, the uplink signal comprises at least one of: a sounding reference signal (SRS), physical uplink control channel (PUCCH), physical uplink shared channel (PUSCH), or physical random access channel (PRACH).

[0175] In some aspects, at least one of the one or more rules determines the symbol direction for the at least one SBFD symbol as uplink if the UE is configured to transmit the uplink signal in the SBFD symbol via at least one of a reference cell or another cell configured for SBFD operation.

[0176] In some aspects, at least one of the one or more rules determines the symbol direction for the at least one SBFD symbol as downlink if the UE is configured, via higher layer signaling, to receive a downlink signal on the SBFD symbol.

[0177] In some aspects, the downlink signal comprises at least one of: a physical downlink control channel (PDCCH), physical downlink shared channel (PDSCH), or channel state information reference signal (CSI-RS).

[0178] In some aspects, at least one of the one or more rules determines the symbol direction for the at least one SBFD symbol as downlink if the UE is configured to receive the downlink signal on the SBFD symbol via at least one of a reference cell or another cell configured for SBFD operation.

[0179] In some aspects, the symbol direction of the at least one SBFD symbol is considered as: uplink if the at least one SBFD symbol is configured as uplink for a reference cell or if the UE is scheduled to transmit an uplink signal on the at least oneSBFD symbol via the reference cell or another cell; and downlink if the at least one SBFD symbol is configured as uplink for a reference cell or if the UE is scheduled to receive a downlink signal on the at least one SBFD symbol via the reference cell or another cell.

[0180] In some aspects, the symbol direction of the at least one SBFD symbol is considered as flexible for transmission or reception if the at least one SBFD symbol is configured as flexible via network signaling and the UE is not scheduled to transmit an uplink signal or receive a downlink signal on the at least one SBFD symbol via the reference cell or another cell.

[0181] In one aspect, method 1500, or any aspect related to it, may be performed by an apparatus, such as communications device 1800 of FIG. 18, which includes various components operable, configured, or adapted to perform the method 1500. Communications device 1800 is described below in further detail.

[0182] Note that FIG. 15 is just one example of a method, and other methods including fewer, additional, or alternative steps are possible consistent with this disclosure.

[0183] FIG. 16 shows an example of a method 1600 of wireless communications at a user equipment (UE), such as a UE 104 of FIGS. 1 and 3.

[0184] Method 1600 begins at step 1605 with outputting, for transmission to a network entity, first signaling indicating a capability of the UE to support subband full duplex (SBFD) operation in transmission time intervals (TTIs) with a transmission direction designated as downlink or flexible. In some cases, the operations of this step refer to, or may be performed by, circuitry for outputting and / or code for outputting as described with reference to FIG. 18.

[0185] Method 1600 then proceeds to step 1610 with obtaining second signaling, from the network entity, indicating a TTI for SBFD operation, wherein the TTI has a transmission direction designated as downlink or flexible. In some cases, the operations of this step refer to, or may be performed by, circuitry for obtaining and / or code for obtaining as described with reference to FIG. 18.

[0186] Method 1600 then proceeds to step 1615 with communicating with the network entity in the TTI in accordance with the indicated capability. In some cases, theoperations of this step refer to, or may be performed by, circuitry for communicating and / or code for communicating as described with reference to FIG. 18.

[0187] In some aspects, the TTI comprises a symbol or a slot.

[0188] In some aspects, the TTI is designated as a flexible symbol via a time division duplexed (TDD) uplink downlink configuration.

[0189] In some aspects, the second signaling indicates at least one of: a first frequency location of an uplink subband configured for SBFD operation in the flexible symbol; or one or more second frequency locations of a downlink subband configured for SBFD operation in the flexible symbol and at least a third frequency location of an uplink subband configured for SBFD operation in the flexible symbol.

[0190] In some aspects, communicating with the network entity in the flexible symbol in accordance with the indicated capability comprises at least one of: outputting signals in the uplink subband, outputting signals in frequency resources outside the uplink subband, or obtaining signals in frequency resources outside the uplink subband.

[0191] In some aspects, communicating with the network entity in the flexible symbol in accordance with the indicated capability comprises at least one of: outputting signals in frequency resources in the uplink subband and obtaining signals in the downlink subband; or outputting signals in frequency resources in the uplink subband, obtaining signals in the downlink subband, and at least one of outputting signals or obtaining signals in frequency resources outside the uplink subband.

[0192] In some aspects, the first signaling indicates a capability of the UE to output signals in frequency resources in the uplink subband and obtain signals in the downlink subbands.

[0193] In one aspect, method 1600, or any aspect related to it, may be performed by an apparatus, such as communications device 1800 of FIG. 18, which includes various components operable, configured, or adapted to perform the method 1600. Communications device 1800 is described below in further detail.

[0194] Note that FIG. 16 is just one example of a method, and other methods including fewer, additional, or alternative steps are possible consistent with this disclosure.

[0195] FIG. 17 shows an example of a method 1700 of wireless communications at a network entity, such as a BS 102 of FIGS. 1 and 3, or a disaggregated base station as discussed with respect to FIG. 2.

[0196] Method 1700 begins at step 1705 with obtaining first signaling indicating a capability of a user equipment (UE) to support subband full duplex (SBFD) operation in transmission time intervals (TTIs) with a transmission direction designated as downlink or flexible. In some cases, the operations of this step refer to, or may be performed by, circuitry for obtaining and / or code for obtaining as described with reference to FIG. 18.

[0197] Method 1700 then proceeds to step 1710 with outputting second signaling indicating a TTI for SBFD operation, wherein the TTI has a transmission direction designated as downlink or flexible. In some cases, the operations of this step refer to, or may be performed by, circuitry for outputting and / or code for outputting as described with reference to FIG. 18.

[0198] Method 1700 then proceeds to step 1715 with communicating with the UE in the TTI in accordance with the indicated capability. In some cases, the operations of this step refer to, or may be performed by, circuitry for communicating and / or code for communicating as described with reference to FIG. 18.

[0199] In some aspects, the TTI comprises a symbol or a slot.

[0200] In some aspects, the TTI is designated as a flexible symbol via a time division duplexed (TDD) uplink downlink configuration.

[0201] In some aspects, the second signaling indicates at least one of a first frequency location of an uplink subband configured for SBFD operation in the flexible symbol; or one or more second frequency locations of a downlink subband configured for SBFD operation in the flexible symbol and at least a third frequency location of an uplink subband configured for SBFD operation in the flexible symbol.

[0202] In some aspects, communicating with the UE in the flexible symbol in accordance with the indicated capability comprises at least one of obtaining signals in the uplink subband, obtaining signals in frequency resources outside the uplink subband, or outputting signals in frequency resources outside the uplink subband.

[0203] In some aspects, communicating with the UE in the flexible symbol in accordance with the indicated capability comprises at least one of obtaining signals infrequency resources in the uplink subband and outputting signals in the downlink subband; or obtaining signals in frequency resources in the uplink subband, outputting signals in the downlink subband, and at least one of obtaining signals or outputting signals in frequency resources outside the uplink subband.

[0204] In some aspects, the first signaling indicates a capability of the UE to output signals in frequency resources in the uplink subband and obtain signals in the downlink subbands.

[0205] In one aspect, method 1700, or any aspect related to it, may be performed by an apparatus, such as communications device 1800 of FIG. 18, which includes various components operable, configured, or adapted to perform the method 1700. Communications device 1800 is described below in further detail.

[0206] Note that FIG. 17 is just one example of a method, and other methods including fewer, additional, or alternative steps are possible consistent with this disclosure.Example Communications Device (s)

[0207] FIG. 18 depicts aspects of an example communications device 1800. In some aspects, communications device 1800 is a user equipment, such as UE 104 described above with respect to FIGS. 1 and 3. In some aspects, communications device 1800 is a network entity, such as BS 102 of FIGS. 1 and 3, or a disaggregated base station as discussed with respect to FIG. 2.

[0208] The communications device 1800 includes a processing system 1805 coupled to the transceiver 1855 (e.g., a transmitter and / or a receiver). In some aspects (e.g., when communications device 1800 is a network entity), processing system 1805 may be coupled to a network interface 1865 that is configured to obtain and send signals for the communications device 1800 via communication link(s), such as a backhaul link, midhaul link, and / or fronthaul link as described herein, such as with respect to FIG. 2. The transceiver 1855 is configured to transmit and receive signals for the communications device 1800 via the antenna 1860, such as the various signals as described herein. The processing system 1805 may be configured to perform processing functions for the communications device 1800, including processing signals received and / or to be transmitted by the communications device 1800.

[0209] The processing system 1805 includes one or more processors 1810. In various aspects, the one or more processors 1810 may be representative of one or more of receive processor 358, transmit processor 364, TX MIMO processor 366, and / or controller / processor 380, as described with respect to FIG. 3. In various aspects, one or more processors 1810 may be representative of one or more of receive processor 338, transmit processor 320, TX MIMO processor 330, and / or controller / processor 340, as described with respect to FIG. 3. The one or more processors 1810 are coupled to a computer-readable medium / memory 1830 via a bus 1850. In certain aspects, the computer-readable medium / memory 1830 is configured to store instructions (e.g., computer-executable code) that when executed by the one or more processors 1810, cause the one or more processors 1810 to perform the method 1400 described with respect to FIG. 14, or any aspect related to it; the method 1500 described with respect to FIG. 15, or any aspect related to it; the method 1600 described with respect to FIG. 16, or any aspect related to it; and the method 1700 described with respect to FIG. 17, or any aspect related to it. Note that reference to a processor performing a function of communications device 1800 may include one or more processors 1810 performing that function of communications device 1800.

[0210] In the depicted example, computer-readable medium / memory 1830 stores code (e.g., executable instructions), such as code for obtaining 1835, code for communicating 1840, and code for outputting 1845. Processing of the code for obtaining 1835, code for communicating 1840, and code for outputting 1845 may cause the communications device 1800 to perform the method 1400 described with respect to FIG. 14, or any aspect related to it; the method 1500 described with respect to FIG. 15, or any aspect related to it; the method 1600 described with respect to FIG. 16, or any aspect related to it; and the method 1700 described with respect to FIG. 17, or any aspect related to it.

[0211] The one or more processors 1810 include circuitry configured to implement (e.g., execute) the code stored in the computer-readable medium / memory 1830, including circuitry for obtaining 1815, circuitry for communicating 1820, and circuitry for outputting 1825. Processing with circuitry for obtaining 1815, circuitry for communicating 1820, and circuitry for outputting 1825 may cause the communications device 1800 to perform the method 1400 described with respect to FIG. 14, or any aspect related to it; the method 1500 described with respect to FIG. 15, or any aspect related toit; the method 1600 described with respect to FIG. 16, or any aspect related to it; and the method 1700 described with respect to FIG. 17, or any aspect related to it.

[0212] Various components of the communications device 1800 may provide means for performing the method 1400 described with respect to FIG. 14, or any aspect related to it; the method 1500 described with respect to FIG. 15, or any aspect related to it; the method 1600 described with respect to FIG. 16, or any aspect related to it; and the method 1700 described with respect to FIG. 17, or any aspect related to it. For example, means for transmitting, sending or outputting for transmission may include transceivers 354 and / or antenna(s) 352 of the UE 104 illustrated in FIG. 3, transceivers 332 and / or antenna(s) 334 of the BS 102 illustrated in FIG. 3, and / or the transceiver 1855 and the antenna 1860 of the communications device 1800 in FIG. 18. Means for receiving or obtaining may include transceivers 354 and / or antenna(s) 352 of the UE 104 illustrated in FIG. 3, transceivers 332 and / or antenna(s) 334 of the BS 102 illustrated in FIG. 3, and / or the transceiver 1855 and the antenna 1860 of the communications device 1800 inFIG. 18Example Clauses

[0213] Implementation examples are described in the following numbered clauses:

[0214] Clause 1 : A method for wireless communications at a network node (e.g., a UE), comprising: obtaining first signaling indicating at least one symbol is configured as a subband full duplex (SBFD) symbol with at least one downlink component carrier (CC) and at least one uplink CC; obtaining second signaling indicating that directional collision handling is enabled for a set of one or more serving cells associated with the at least one downlink CC and the at least one uplink CC; and communicating with the one or more serving cells based on a symbol direction for the at least one SBFD symbol, wherein the symbol direction is based on one or more rules.

[0215] Clause 2: The method of Clause 1, wherein at least one of the one or more rules indicate the symbol direction for the SBFD symbol as uplink if the network node is configured, via higher layer signaling, to transmit an uplink signal on the SBFD symbol.

[0216] Clause 3 : The method of Clause 2, wherein the uplink signal comprises at least one of: a sounding reference signal (SRS), physical uplink control channel (PUCCH), physical uplink shared channel (PUSCH), or physical random access channel (PRACH).

[0217] Clause 4: The method of Clause 2, wherein at least one of the one or more rules determines the symbol direction for the at least one SBFD symbol as uplink if the network node is configured to transmit the uplink signal in the SBFD symbol via at least one of a reference cell or another cell configured for SBFD operation.

[0218] Clause 5: The method of any one of Clauses 1-4, wherein at least one of the one or more rules determines the symbol direction for the at least one SBFD symbol as downlink if the network node is configured, via higher layer signaling, to receive a downlink signal on the SBFD symbol.

[0219] Clause 6: The method of Clause 5, wherein the downlink signal comprises at least one of: a physical downlink control channel (PDCCH), physical downlink shared channel (PDSCH), or channel state information reference signal (CSI-RS).

[0220] Clause 7: The method of Clause 5, wherein at least one of the one or more rules determines the symbol direction for the at least one SBFD symbol as downlink if the network node is configured to receive the downlink signal on the SBFD symbol via at least one of a reference cell or another cell configured for SBFD operation.

[0221] Clause 8: The method of any one of Clauses 1-7, wherein, according to the one or more rules, the network node ignores a configuration if: the symbol direction for the at least one SBFD symbol is to be downlink for at least a reference cell; and the network node is configured, via higher layer signaling, to transmit an uplink signal on the SBFD symbol associated with the reference cell or another cell.

[0222] Clause 9: The method of any one of Clauses 1-8, wherein, according to the one or more rules, the network node considers a configuration invalid if: the symbol direction for the at least one SBFD symbol is to be uplink for at least a reference cell; and the network node is configured, via higher layer signaling, to receive a downlink signal on the SBFD symbol associated with the reference cell or another cell.

[0223] Clause 10: The method of any one of Clauses 1-9, wherein, according to the one or more rules, at least one of: the network node is not required to receive a scheduled downlink signal and not expected to transmit a scheduled uplink signal, if the symbol direction for the at least one SBFD symbol is to be uplink for a first cell and downlink for a second cell; the network node ignores a configuration if the at least one SBFD symbol is indicated as downlink for a reference cell, the configuration schedules the network nodeto transmit an uplink signal via downlink control information (DCI) via another cell, and the network node is scheduled to receive a downlink signal on the at least one SBFD symbol; or the network node is not required to receive a scheduled downlink signal via a reference cell, if the network node detects downlink control information (DCI) scheduling a transmission on the at least one SBFD symbol associated with another cell.

[0224] Clause 11 : The method of Clause 10, wherein the reference cell and the other cell operate in same frequency bands.

[0225] Clause 12: The method of Clause 10, wherein the reference cell and the other cell operate in different frequency bands.

[0226] Clause 13: The method of any one of Clauses 1-12, wherein the symbol direction of the at least one SBFD symbol is considered as: uplink if the at least one SBFD symbol is configured as uplink for a reference cell or if the network node is scheduled to transmit an uplink signal on the at least one SBFD symbol via the reference cell or another cell; and downlink if the at least one SBFD symbol is configured as uplink for a reference cell or if the network node is scheduled to receive a downlink signal on the at least one SBFD symbol via the reference cell or another cell.

[0227] Clause 14: The method of Clause 13, wherein, according to the one or more rules, at least one of: the network node does not expect to be scheduled for reception on the at least one SBFD symbol via the other cell if the symbol direction of the at least one SBFD symbol is considered as uplink.

[0228] Clause 15: The method of Clause 13, wherein, according to the one or more rules, at least one of: the network node refrains from transmitting an uplink signal scheduled for transmission on the at least one SBFD symbol via the other cell if the symbol direction of the at least one SBFD symbol is considered as uplink.

[0229] Clause 16: The method of any one of Clauses 1-15, wherein the symbol direction of the at least one SBFD symbol is considered as flexible for transmission or reception if the at least one SBFD symbol is configured as flexible via network signaling and the network node is not scheduled to transmit an uplink signal or receive a downlink signal on the at least one SBFD symbol via the reference cell or another cell.

[0230] Clause 17: A method for wireless communications at a first network node (e.g., a UE), comprising: outputting, for transmission to a second network node, firstsignaling indicating a capability of the first network node to support subband full duplex (SBFD) operation in transmission time intervals (TTIs) with a transmission direction designated as downlink or flexible; obtaining second signaling, from the network node, indicating a TTI for SBFD operation, wherein the TTI has a transmission direction designated as downlink or flexible; and communicating with the network node in the TTI in accordance with the indicated capability.

[0231] Clause 18: The method of Clause 17, wherein the TTI comprises a symbol or a slot.

[0232] Clause 19: The method of any one of Clauses 17-18, wherein the TTI is designated as a flexible symbol via a time division duplexed (TDD) uplink downlink configuration.

[0233] Clause 20: The method of Clause 19, wherein the second signaling indicates at least one of: a first frequency location of an uplink subband configured for SBFD operation in the flexible symbol; or one or more second frequency locations of a downlink subband configured for SBFD operation in the flexible symbol and at least a third frequency location of an uplink subband configured for SBFD operation in the flexible symbol.

[0234] Clause 21 : The method of Clause 20, wherein communicating with the second network node in the flexible symbol in accordance with the indicated capability comprises at least one of: outputting signals in the uplink subband, outputting signals in frequency resources outside the uplink subband, or obtaining signals in frequency resources outside the uplink subband.

[0235] Clause 22: The method of Clause 20, wherein communicating with the second network node in the flexible symbol in accordance with the indicated capability comprises at least one of: outputting signals in frequency resources in the uplink subband and obtaining signals in the downlink subband; or outputting signals in frequency resources in the uplink subband, obtaining signals in the downlink subband, and at least one of outputting signals or obtaining signals in frequency resources outside the uplink subband.

[0236] Clause 23 : The method of Clause 20, wherein the first signaling indicates a capability of the first network node to output signals in frequency resources in the uplink subband and obtain signals in the downlink subbands.

[0237] Clause 24: A method for wireless communications at a network node, comprising: outputting first signaling indicating at least one symbol is configured as a subband full duplex (SBFD) symbol with at least one downlink component carrier (CC) and at least one uplink CC; outputting second signaling indicating that directional collision handling is enabled for a set of one or more serving cells associated with the at least one downlink CC and the at least one uplink CC; and communicating with at least one user equipment (UE) based on a symbol direction for the at least one SBFD symbol, wherein the symbol direction is based on one or more rules.

[0238] Clause 25: The method of Clause 24, wherein at least one of the one or more rules indicate the symbol direction for the SBFD symbol as uplink if the UE is configured, via higher layer signaling, to transmit an uplink signal on the SBFD symbol.

[0239] Clause 26: The method of Clause 25, wherein the uplink signal comprises at least one of: a sounding reference signal (SRS), physical uplink control channel (PUCCH), physical uplink shared channel (PUSCH), or physical random access channel (PRACH).

[0240] Clause 27: The method of Clause 25, wherein at least one of the one or more rules determines the symbol direction for the at least one SBFD symbol as uplink if the UE is configured to transmit the uplink signal in the SBFD symbol via at least one of a reference cell or another cell configured for SBFD operation.

[0241] Clause 28: The method of any one of Clauses 24-27, wherein at least one of the one or more rules determines the symbol direction for the at least one SBFD symbol as downlink if the UE is configured, via higher layer signaling, to receive a downlink signal on the SBFD symbol.

[0242] Clause 29: The method of Clause 28, wherein the downlink signal comprises at least one of: a physical downlink control channel (PDCCH), physical downlink shared channel (PDSCH), or channel state information reference signal (CSI-RS).

[0243] Clause 30: The method of Clause 28, wherein at least one of the one or more rules determines the symbol direction for the at least one SBFD symbol as downlink if the UE is configured to receive the downlink signal on the SBFD symbol via at least one of a reference cell or another cell configured for SBFD operation.

[0244] Clause 31 : The method of any one of Clauses 24-30, wherein the symbol direction of the at least one SBFD symbol is considered as: uplink if the at least one SBFD symbol is configured as uplink for a reference cell or if the UE is scheduled to transmit an uplink signal on the at least one SBFD symbol via the reference cell or another cell; and downlink if the at least one SBFD symbol is configured as uplink for a reference cell or if the UE is scheduled to receive a downlink signal on the at least one SBFD symbol via the reference cell or another cell.

[0245] Clause 32: The method of any one of Clauses 24-31, wherein the symbol direction of the at least one SBFD symbol is considered as flexible for transmission or reception if the at least one SBFD symbol is configured as flexible via network signaling and the UE is not scheduled to transmit an uplink signal or receive a downlink signal on the at least one SBFD symbol via the reference cell or another cell.

[0246] Clause 33: A method for wireless communications at a network node, comprising: obtaining first signaling indicating a capability of a user equipment (UE) to support subband full duplex (SBFD) operation in transmission time intervals (TTIs) with a transmission direction designated as downlink or flexible; outputting second signaling indicating a TTI for SBFD operation, wherein the TTI has a transmission direction designated as downlink or flexible; and communicating with the UE in the TTI in accordance with the indicated capability.

[0247] Clause 34: The method of Clause 33, wherein the TTI comprises a symbol or a slot.

[0248] Clause 35: The method of any one of Clauses 33-34, wherein the TTI is designated as a flexible symbol via a time division duplexed (TDD) uplink downlink configuration.

[0249] Clause 36: The method of Clause 35, wherein the second signaling indicates at least one of: a first frequency location of an uplink subband configured for SBFD operation in the flexible symbol; or one or more second frequency locations of a downlink subband configured for SBFD operation in the flexible symbol and at least a third frequency location of an uplink subband configured for SBFD operation in the flexible symbol.

[0250] Clause 37: The method of Clause 36, wherein communicating with the UE in the flexible symbol in accordance with the indicated capability comprises at least one of: obtaining signals in the uplink subband, obtaining signals in frequency resources outside the uplink subband, or outputting signals in frequency resources outside the uplink subband.

[0251] Clause 38: The method of Clause 36, wherein communicating with the UE in the flexible symbol in accordance with the indicated capability comprises at least one of: obtaining signals in frequency resources in the uplink subband and outputting signals in the downlink subband; or obtaining signals in frequency resources in the uplink subband, outputting signals in the downlink subband, and at least one of obtaining signals or outputting signals in frequency resources outside the uplink subband.

[0252] Clause 39: The method of Clause 36, wherein the first signaling indicates a capability of the UE to output signals in frequency resources in the uplink subband and obtain signals in the downlink subbands.

[0253] Clause 40: An apparatus, comprising: at least one memory comprising executable instructions; and at least one processor configured to execute the executable instructions and cause the apparatus to perform a method in accordance with any one of Clauses 1-39.

[0254] Clause 41 : An apparatus, comprising means for performing a method in accordance with any one of Clauses 1-39.

[0255] Clause 42: A non-transitory computer-readable medium comprising executable instructions that, when executed by at least one processor of an apparatus, cause the apparatus to perform a method in accordance with any one of Clauses 1-39.

[0256] Clause 43 : A computer program product embodied on a computer-readable storage medium comprising code for performing a method in accordance with any one of Clauses 1-39.

[0257] Clause 44: A wireless node, comprising: at least one transceiver; at least one memory comprising executable instructions; and at least one processor configured to execute the executable instructions and cause the wireless node to perform a method in accordance with any one of Clauses 1-16, wherein the at least one transceiver is configured to receive the first signaling and receive the second signaling.

[0258] Clause 45: A wireless node, comprising: at least one transceiver; at least one memory comprising executable instructions; and at least one processor configured to execute the executable instructions and cause the wireless node to perform a method in accordance with any one of Clauses 17-23, wherein the at least one transceiver is configured to transmit the first signaling and receive the second signaling.

[0259] Clause 46: A network node, comprising: at least one transceiver; at least one memory comprising executable instructions; and at least one processor configured to execute the executable instructions and cause the network node to perform a method in accordance with any one of Clauses 24-32 wherein the at least one transceiver is configured to transmit the first signaling and transmit the second signaling.

[0260] Clause 47: A network node, comprising: at least one transceiver; at least one memory comprising executable instructions; and at least one processor configured to execute the executable instructions and cause the network node to perform a method in accordance with any one of Clauses 33-39 wherein the at least one transceiver is configured to receive the first signaling and transmit the second signaling.Additional Considerations

[0261] The preceding description is provided to enable any person skilled in the art to practice the various aspects described herein. The examples discussed herein are not limiting of the scope, applicability, or aspects set forth in the claims. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects. For example, changes may be made in the function and arrangement of elements discussed without departing from the scope of the disclosure. Various examples may omit, substitute, or add various procedures or components as appropriate. For instance, the methods described may be performed in an order different from that described, and various actions may be added, omitted, or combined. Also, features described with respect to some examples may be combined in some other examples. For example, an apparatus may be implemented or a method may be practiced using any number of the aspects set forth herein. In addition, the scope of the disclosure is intended to cover such an apparatus or method that is practiced using other structure, functionality, or structure and functionality in addition to, or other than, the various aspects of the disclosure set forth herein. It should be understoodthat any aspect of the disclosure disclosed herein may be embodied by one or more elements of a claim.

[0262] The various illustrative logical blocks, modules and circuits described in connection with the present disclosure may be implemented or performed with a general purpose processor, a graphics processing unit (GPU), a neural processing unit (NPU), a digital signal processor (DSP), an ASIC, a field programmable gate array (FPGA) or other programmable logic device (PLD), 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 commercially available 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, one or more microprocessors in conjunction with a DSP core, a system on a chip (SoC), or any other such configuration.

[0263] As used herein, the term wireless node may refer to, for example, a network entity or a user equipment (UE). In this context, a network entity may be a base station (e.g., a gNB) or a module (e.g., a CU, DU, and / or RU) of a disaggregated base station.

[0264] While the present disclosure may describe certain operations as being performed by one type of wireless node, the same or similar operations may also be performed by another type of wireless node. For example, operations performed by a network entity may also (or instead) be performed by a UE. Similarly, operations performed by a UE may also (or instead) be performed by a network entity.

[0265] Further, while the present disclosure may describe certain types of communications between different types of wireless nodes (e.g., between a network entity and a UE), the same or similar types of communications may occur between same types of wireless nodes (e.g., between network entities or between UEs, in a peer-to-peer scenario). Further, communications may occur in reverse direction relative to what is described (e.g., a UE could transmit a request to a network entity and the network entity transmits a response; OR a network entity could transmit the request to a UE and the UE transmits the response).

[0266] As used herein, “a processor,” “at least one processor” or “one or more processors” generally refers to a single processor configured to perform one or multipleoperations or multiple processors configured to collectively perform one or more operations. In the case of multiple processors, performance of the one or more operations could be divided amongst different processors, though one processor may perform multiple operations, and multiple processors could collectively perform a single operation. Similarly, “a memory,” “at least one memory” or “one or more memories” generally refers to a single memory configured to store data and / or instructions, multiple memories configured to collectively store data and / or instructions.

[0267] Means for obtaining, means for communicating, and means for outputting may comprise one or more processors, such as one or more of the processors described above with reference to FIG. 18.

[0268] As used herein, a phrase referring to “at least one of’ a list of items refers to any combination of those items, including single members. As an example, “at least one of a, b, or c” is intended to cover a, b, c, a-b, a-c, b-c, and a-b-c, as well as any combination with multiples of the same element (e.g., a-a, a-a-a, a-a-b, a-a-c, a-b-b, a-c-c, b-b, b-b-b, b-b-c, c-c, and c-c-c or any other ordering of a, b, and c).

[0269] As used herein, the term “determining” encompasses a wide variety of actions. For example, “determining” may include calculating, computing, processing, deriving, investigating, looking up (e.g., looking up in a table, a database or another data structure), ascertaining and the like. Also, “determining” may include receiving (e.g., receiving information), accessing (e.g., accessing data in a memory) and the like. Also, “determining” may include resolving, selecting, choosing, establishing and the like.

[0270] The methods disclosed herein comprise one or more actions for achieving the methods. The method actions may be interchanged with one another without departing from the scope of the claims. In other words, unless a specific order of actions is specified, the order and / or use of specific actions may be modified without departing from the scope of the claims. Further, the various operations of methods described above may be performed by any suitable means capable of performing the corresponding functions. The means may include various hardware and / or software component(s) and / or module(s), including, but not limited to a circuit, an application specific integrated circuit (ASIC), or processor. Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects,executables, threads of execution, procedures, or functions, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0271] The following claims are not intended to be limited to the aspects shown herein, but are to be accorded the full scope consistent with the language of the claims. Within a claim, reference to an element in the singular is not intended to mean “one and only one” unless specifically so stated, but rather “one or more.” Unless specifically stated otherwise, the term “some” refers to one or more. No claim element is to be construed under the provisions of 35 U.S.C. §112(f) unless the element is expressly recited using the phrase “means for”. All structural and functional equivalents to the elements of the various aspects described throughout this disclosure that are known or later come to be known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be encompassed by the claims. Moreover, nothing disclosed herein is intended to be dedicated to the public regardless of whether such disclosure is explicitly recited in the claims.

Claims

WHAT IS CLAIMED IS:

1. An apparatus for wireless communication, comprising: at least one memory comprising computer-executable instructions; and one or more processors configured to execute the computer-executable instructions and cause the apparatus to: obtain first signaling indicating at least one symbol is configured as a subband full duplex (SBFD) symbol with at least one downlink component carrier (CC) and at least one uplink CC; obtain second signaling indicating that directional collision handling is enabled for a set of one or more serving cells associated with the at least one downlink CC and the at least one uplink CC; and communicate with the one or more serving cells based on a symbol direction for the at least one SBFD symbol, wherein the symbol direction is based on one or more rules.

2. The apparatus of claim 1, wherein at least one of the one or more rules indicate the symbol direction for the SBFD symbol as uplink if the apparatus is configured, via higher layer signaling, to transmit an uplink signal on the SBFD symbol.

3. The apparatus of claim 2, wherein the uplink signal comprises at least one of: a sounding reference signal (SRS), physical uplink control channel (PUCCH), physical uplink shared channel (PUSCH), or physical random access channel (PRACH).

4. The apparatus of claim 2, wherein at least one of the one or more rules determines the symbol direction for the at least one SBFD symbol as uplink if the apparatus is configured to transmit the uplink signal in the SBFD symbol via at least one of a reference cell or another cell configured for SBFD operation.

5. The apparatus of claim 1, wherein at least one of the one or more rules determines the symbol direction for the at least one SBFD symbol as downlink if the apparatus is configured, via higher layer signaling, to receive a downlink signal on the SBFD symbol.

6. The apparatus of claim 5, wherein the downlink signal comprises at least one of: a physical downlink control channel (PDCCH), physical downlink shared channel (PDSCH), or channel state information reference signal (CSI-RS).

7. The apparatus of claim 5, wherein at least one of the one or more rules determines the symbol direction for the at least one SBFD symbol as downlink if the apparatus is configured to receive the downlink signal on the SBFD symbol via at least one of a reference cell or another cell configured for SBFD operation.

8. The apparatus of claim 1, wherein, according to the one or more rules, the apparatus ignores a configuration if: the symbol direction for the at least one SBFD symbol is to be downlink for at least a reference cell; and the apparatus is configured, via higher layer signaling, to transmit an uplink signal on the SBFD symbol associated with the reference cell or another cell.

9. The apparatus of claim 1, wherein, according to the one or more rules, the apparatus considers a configuration invalid if: the symbol direction for the at least one SBFD symbol is to be uplink for at least a reference cell; and the apparatus is configured, via higher layer signaling, to receive a downlink signal on the SBFD symbol associated with the reference cell or another cell.

10. The apparatus of claim 1, wherein, according to the one or more rules, at least one of: the apparatus is not required to receive a scheduled downlink signal and not expected to transmit a scheduled uplink signal, if the symbol direction for the at least one SBFD symbol is to be uplink for a first cell and downlink for a second cell; the apparatus ignores a configuration if the at least one SBFD symbol is indicated as downlink for a reference cell, the configuration schedules the apparatus to transmit an uplink signal via downlink control information (DCI) via another cell, andthe apparatus is scheduled to receive a downlink signal on the at least one SBFD symbol; or the apparatus is not required to receive a scheduled downlink signal via a reference cell, if the apparatus detects downlink control information (DCI) scheduling a transmission on the at least one SBFD symbol associated with another cell.

11. The apparatus of claim 10, wherein the reference cell and the other cell operate in same frequency bands.

12. The apparatus of claim 10, wherein the reference cell and the other cell operate in different frequency bands.

13. The apparatus of claim 1, wherein the symbol direction of the at least one SBFD symbol is considered as: uplink if the at least one SBFD symbol is configured as uplink for a reference cell or if the apparatus is scheduled to transmit an uplink signal on the at least one SBFD symbol via the reference cell or another cell; and downlink if the at least one SBFD symbol is configured as uplink for a reference cell or if the apparatus is scheduled to receive a downlink signal on the at least one SBFD symbol via the reference cell or another cell.

14. The apparatus of claim 13, wherein, according to the one or more rules: the apparatus does not expect to be scheduled for reception on the at least one SBFD symbol via the other cell if the symbol direction of the at least one SBFD symbol is considered as uplink.

15. The apparatus of claim 13, wherein, according to the one or more rules: the apparatus refrains from transmitting an uplink signal scheduled for transmission on the at least one SBFD symbol via the other cell if the symbol direction of the at least one SBFD symbol is considered as uplink.

16. The apparatus of claim 1, wherein the symbol direction of the at least one SBFD symbol is considered as flexible for transmission or reception if the at least one SBFD symbol is configured as flexible via network signaling and the apparatus is not scheduled to transmit an uplink signal or receive a downlink signal on the at least one SBFD symbol via a reference cell or another cell.

17. The apparatus of claim 1, further comprising at least one transceiver configured to receive the first signaling, wherein the apparatus is configured as a user equipment (UE).

18. An apparatus for wireless communication, comprising: at least one memory comprising computer-executable instructions; and one or more processors configured to execute the computer-executable instructions and cause the apparatus to: output, for transmission to a network entity, first signaling indicating a capability of the apparatus to support subband full duplex (SBFD) operation in transmission time intervals (TTIs) with a transmission direction designated as downlink or flexible; obtain second signaling, from the network entity, indicating a TTI for SBFD operation, wherein the TTI has a transmission direction designated as downlink or flexible; and communicate with the network entity in the TTI in accordance with the indicated capability.

19. The apparatus of claim 18, wherein the TTI comprises a symbol or a slot.

20. The apparatus of claim 18, wherein the TTI is designated as a flexible symbol via a time division duplexed (TDD) uplink downlink configuration.

21. The apparatus of claim 20, wherein the second signaling indicates at least one of:a first frequency location of an uplink subband configured for SBFD operation in the flexible symbol; or one or more second frequency locations of a downlink subband configured for SBFD operation in the flexible symbol and at least a third frequency location of an uplink subband configured for SBFD operation in the flexible symbol.

22. The apparatus of claim 21, wherein communicating with the network entity in the flexible symbol in accordance with the indicated capability comprises at least one of outputting signals in the uplink subband, outputting signals in frequency resources outside the uplink subband, or obtaining signals in frequency resources outside the uplink subband.

23. The apparatus of claim 21, wherein communicating with the network entity in the flexible symbol in accordance with the indicated capability comprises at least one of outputting signals in frequency resources in the uplink subband and obtaining signals in the downlink subband; or outputting signals in frequency resources in the uplink subband, obtaining signals in the downlink subband, and at least one of outputting signals or obtaining signals in frequency resources outside the uplink subband.

24. The apparatus of claim 21, wherein the first signaling indicates a capability of the apparatus to output signals in frequency resources in the uplink subband and obtain signals in the downlink subbands.

25. The apparatus of claim 1, further comprising at least one transceiver configured to transmit the first signaling, wherein the apparatus is configured as a user equipment (UE).

26. An apparatus for wireless communication, comprising: at least one memory comprising computer-executable instructions; andone or more processors configured to execute the computer-executable instructions and cause the apparatus to: output first signaling indicating at least one symbol is configured as a subband full duplex (SBFD) symbol with at least one downlink component carrier (CC) and at least one uplink CC; output second signaling indicating that directional collision handling is enabled for a set of one or more serving cells associated with the at least one downlink CC and the at least one uplink CC; and communicate with at least one user equipment (UE) based on a symbol direction for the at least one SBFD symbol, wherein the symbol direction is based on one or more rules.

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