CSI resource and reporting configuration for full duplex channels

Abstract

A base station may configure a user equipment for reporting channel state information about a non-contiguous downlink channel, such as a sub-band full duplex downlink channel. A user equipment may report channel state information regarding a non-contiguous downlink channel using a single channel state information report.

Description

[0001] This application is a divisional application of Chinese invention patent application 202080101721.5 (PCT / CN2020 / 095058) with a filing date of June 9, 2020 and entitled “CSI resources and reporting configuration for full-duplex channels”. Technical Field

[0002] The present disclosure relates generally to communication systems, and more particularly to full-duplex wireless communication systems. Background Art

[0003] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcast. Typical wireless communication systems may employ multiple access technologies capable of supporting communication with multiple users by sharing available system resources. Examples of such multiple access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems.

[0004] These multiple access technologies have been adopted in various telecommunication standards to provide common protocols that enable different wireless devices to communicate at city, country, region, and even global levels. An example telecommunication standard is 5G New Radio (NR). 5G NR is a part of the continuous mobile broadband evolution promulgated by the Third Generation Partnership Project (3GPP) to meet new requirements associated with latency, reliability, security, scalability (e.g., with the Internet of Things (IoT)) and other requirements. 5GNR includes services associated with enhanced mobile broadband (eMBB), massive machine type communication (mMTC), and ultra-reliable low latency communication (URLLC). Some aspects of 5G NR can be based on 4G Long Term Evolution (LTE) standards. There is a need for further improvements to 5G NR technology. These improvements may also be applicable to other multiple access technologies and telecommunication standards that employ these technologies. Summary of the invention

[0005] A brief summary of one or more aspects is given below to provide a basic understanding of such aspects. This summary is not an exhaustive overview of all conceived aspects, and is neither intended to identify the key or critical elements of all aspects nor to define the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to a more detailed description that will be presented later.

[0006] In one aspect of the present disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a user equipment (UE). The UE may receive a full-duplex (FD) downlink channel from a base station, the FD downlink channel being duplexed with a second FD channel, wherein the second FD channel has a carrier frequency between a carrier frequency of a first portion of the FD downlink channel and a carrier frequency of a second portion of the FD downlink channel; receive a channel state information reference signal (CSI-RS) from the base station on a resource having a first codeword of the first portion of the FD downlink channel and a resource having a first codeword of the second portion of the FD downlink channel; and transmit a channel state information (CSI) report based on the CSI-RS received on the first portion and the second portion to the base station.

[0007] In some aspects, the CSI-RS may be received on a first CSI reference resource on a first portion, wherein the CSI-RS is received on a second CSI reference resource on a second portion, and wherein the CSI report is based on both the first CSI reference resource and the second CSI reference resource.

[0008] In some aspects, the CSI report may include a single channel estimate based on both the first CSI reference resource and the second CSI reference resource.

[0009] In some aspects, the UE may receive a reporting indication for a time slot from a base station, wherein the UE may determine based on the reporting indication to generate a CSI report based on both the first CSI reference resource and the second CSI reference resource for the time slot.

[0010] In some aspects, the UE may receive a duplex state indication for a time slot from a base station, wherein the UE may determine based on the duplex state indication to generate a CSI report based on both the first CSI reference resource and the second CSI reference resource for the time slot.

[0011] In some aspects, the UE may: determine to generate a CSI report based on both a first CSI reference resource and a second CSI reference resource for a time slot; and transmit a reporting indication to a base station indicating that the CSI report is based on both the first CSI reference resource and the second CSI reference resource for the time slot.

[0012] In some aspects, the CSI-RS may be received on a single CSI reference resource on both the first portion and the second portion, and wherein the CSI report may be based on the single CSI reference.

[0013] In some aspects, the CSI-RS may not be received on the resource having the symbol of the single CSI reference resource on the second FD channel.

[0014] In some aspects, the UE may: determine that the CSI-RS is a tracking reference signal; determine that the CSI-RS is not received on resources of the second FD channel; and silence the CSI-RS received on resources of the first portion of the FD downlink channel and resources of the second portion of the FD downlink channel.

[0015] In some aspects, a UE may receive a CSI resource configuration for a CSI reference resource that identifies a frequency domain configuration for a single CSI reference resource.

[0016] In some aspects, a CSI resource configuration may include a bitmap identifying resources associated with a single CSI reference resource.

[0017] In some aspects, each bit of the bitmap may correspond to a resource block group of a single CSI reference resource and may identify whether the CSI-RS is received on the corresponding resource block group.

[0018] In some aspects, the UE may be configured with multiple resource bandwidths, wherein each resource bandwidth in the multiple resource bandwidths is configured with a separate resource block group configuration, wherein the FD downlink channel is associated with an active resource bandwidth in the multiple resource bandwidths, and wherein the bitmap corresponds to the resource block group of the active resource bandwidth.

[0019] In some aspects, a UE may have a maximum number of disjoint allocations that may be associated with a single CSI reference resource.

[0020] In some aspects, a UE may have a minimum number of physical resource blocks that may be associated with each disjoint allocation of a single CSI reference resource.

[0021] In another aspect of the present disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a UE. The UE may receive a full-duplex (FD) downlink channel from a base station, the FD downlink channel being duplexed with a second FD channel, wherein the second FD channel has a carrier frequency between a carrier frequency of a first portion of the FD downlink channel and a carrier frequency of a second portion of the FD downlink channel; and receive a channel state information reference signal (CSI-RS) from the base station on resources having a first symbol in the first portion of the FD downlink channel and resources having a first symbol in the second portion of the FD downlink channel, wherein the UE is configured with a first CSI reference resource, the first CSI reference resource including resources of the first portion of the FD downlink channel and resources of the second portion of the FD downlink channel, the first CSI reference resource not including resources of the second FD channel, and the UE is configured with a second CSI reference resource, the second CSI reference resource including resources of the first portion of the FD downlink channel, resources of the second portion of the FD downlink channel, and resources of the second FD channel.

[0022] In some aspects, the UE may: determine whether the CSI-RS is received on a first CSI reference resource or a second CSI reference resource; when determining that the CSI-RS is received on the second CSI reference resource, discard the CSI-RS; and when determining that the CSI-RS is received on the first CSI reference resource, transmit a CSI-RS-based channel state information (CSI) report to a base station.

[0023] In some aspects, the UE may: determine whether the CSI-RS is received on a first CSI reference resource or a second CSI reference resource; upon determining that the CSI-RS is received on the second CSI reference resource, discard a portion of the CSI-RS received on the resources of a second FD channel, and transmit a channel state information (CSI) report based on the CSI-RS received on the first and second parts of the FD downlink channel to the base station; and upon determining that the CSI-RS is received on the first CSI reference resource, transmit a channel state information (CSI) report based on the CSI-RS to the base station.

[0024] In another aspect of the present disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a base station. The base station may: transmit a full-duplex (FD) downlink channel to a user equipment (UE), the FD downlink channel being full-duplexed with a second FD channel, wherein the second FD channel has a carrier frequency between a carrier frequency of a first portion of the FD downlink channel and a carrier frequency of a second portion of the FD downlink channel; transmit a channel state information reference signal (CSI-RS) to the UE on a resource having a first codeword of the first portion of the FD downlink channel and a resource having a first codeword of the second portion of the FD downlink channel; and receive a channel state information (CSI) report based on the CSI-RS transmitted on the first portion and the second portion from the UE.

[0025] In some aspects, the CSI-RS may be transmitted on a first CSI reference resource on a first portion, wherein the CSI-RS is transmitted on a second CSI reference resource on a second portion, and wherein the CSI report is based on both the first CSI reference resource and the second CSI reference resource.

[0026] In some aspects, the CSI report may include a single channel estimate based on both the first CSI reference resource and the second CSI reference resource.

[0027] In some aspects, the base station may transmit a reporting indication for a time slot to the UE, wherein the reporting indication indicates to the UE that a CSI report is to be generated based on both the first CSI reference resource and the second CSI reference resource for the time slot.

[0028] In some aspects, the base station may transmit a duplex state indication for a time slot to the UE, the duplex state indication indicating to the UE that the FD downlink channel is duplexed with the second FD channel, and the UE generates a CSI report based on both the first CSI reference resource and the second CSI reference resource for the time slot based on the duplex state indication.

[0029] In some aspects, the base station may receive a reporting indication from the UE indicating that the CSI report is based on both the first CSI reference resource and the second CSI reference resource for the time slot.

[0030] In some aspects, the CSI-RS may be transmitted on a single CSI reference resource on both the first portion and the second portion, and wherein the CSI report is based on the single CSI reference resource.

[0031] In some aspects, CSI-RS may not be transmitted on the resource having the symbol of the single CSI reference resource on the second FD channel.

[0032] In some aspects, a base station may transmit a CSI resource configuration for a CSI reference resource that identifies a frequency domain configuration for a single CSI reference resource.

[0033] In some aspects, a CSI resource configuration may include a bitmap identifying resources associated with a single CSI reference resource.

[0034] In some aspects, each bit of the bitmap may correspond to a resource block group of a single CSI reference resource and identify whether a CSI-RS is received on the corresponding resource block group.

[0035] In some aspects, the UE may be configured with multiple resource bandwidths, wherein each resource bandwidth in the multiple resource bandwidths is configured with a separate resource block group configuration, wherein the FD downlink channel is associated with an active resource bandwidth in the multiple resource bandwidths, and wherein the bitmap corresponds to the resource block group of the active resource bandwidth.

[0036] In some aspects, a UE may have a maximum number of disjoint allocations that may be associated with a single CSI reference resource.

[0037] In some aspects, a UE may have a minimum number of physical resource blocks that may be associated with each disjoint allocation of a single CSI reference resource.

[0038] In another aspect of the present disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a base station. The base station may: transmit a full-duplex (FD) downlink channel to a user equipment (UE), the FD downlink channel being full-duplexed with a second FD channel, wherein the second FD channel has a carrier frequency between a carrier frequency of a first portion of the FD downlink channel and a carrier frequency of a second portion of the FD downlink channel; and transmit a channel state information reference signal (CSI-RS) to the UE on resources having a first symbol in the first portion of the FD downlink channel and resources having a first symbol in the second portion of the FD downlink channel, wherein the UE is configured with a first CSI reference resource, the first CSI reference resource includes resources of the first portion of the FD downlink channel and resources of the second portion of the FD downlink channel, the first CSI reference resource does not include resources of the second FD channel, and the UE is configured with a second CSI reference resource, the second CSI reference resource includes resources of the first portion of the FD downlink channel, resources of the second portion of the FD downlink channel, and resources of the second FD channel.

[0039] In some aspects, if the CSI-RS is transmitted on the first CSI reference resource, the base station may receive a CSI-RS based channel state information (CSI) report from the UE.

[0040] In some aspects, if the CSI-RS is transmitted on the second CSI reference resource, the base station may receive a channel state information (CSI) report from the UE based on the CSI-RS transmitted on the first and second parts of the FD downlink channel, but not based on the portion of the CSI-RS transmitted on the resources of the second FD channel; and if the CSI-RS is transmitted on the first CSI reference resource, receive a CSI report based on the CSI-RS.

[0041] To achieve the foregoing and related ends, the one or more aspects include the features fully described below and particularly pointed out in the claims. The following description and drawings set forth in detail certain illustrative features of the one or more aspects. However, these features are merely indicative of several of the various ways in which the principles of the various aspects may be employed, and this description is intended to cover all such aspects and their equivalents. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 is a diagram illustrating an example of a wireless communication system and an access network.

[0043] Figure 2A , 2B, 2C, and 2D are diagrams illustrating examples of a first 5G / NR frame, a DL channel within a 5G / NR subframe, a second 5G / NR frame, and a UL channel within a 5G / NR subframe, respectively.

[0044] Figure 3 is a diagram illustrating an example of a base station and a user equipment (UE) in an access network.

[0045] Figure 4A is a diagram illustrating communication between a base station and a first UE and a second UE.

[0046] Figure 4B is a diagram illustrating that a UE utilizes full-duplex communication with a base station.

[0047] Figure 5 is a diagram illustrating various resource bandwidth time slot configurations.

[0048] Figure 6 is a diagram illustrating a time slot configuration with sub-band full-duplex downlink and uplink channels.

[0049] Figure 7 is a communication flow diagram illustrating channel state information (CSI) reporting for a sub-band full-duplex downlink channel.

[0050] Figure 8 is a diagram illustrating a channel state reference signal (CSI-RS) for a sub-band full-duplex downlink channel.

[0051] Fig. 9 is a communication flow diagram illustrating CSI reporting for a sub-band full-duplex downlink channel based on a CSI-RS with multiple CSI reference resources.

[0052] Fig.10 is a diagram illustrating a CSI-RS for a full-duplex downlink channel.

[0053] Fig.11 This is a diagram illustrating the CSI reference resource configuration bit mapping.

[0054] Fig.12 is a flow chart of a wireless communication method.

[0055] Fig.13 is a flow chart of a wireless communication method.

[0056] Fig.14 is a flow chart of a wireless communication method.

[0057] Fig.15 is a flow chart of a wireless communication method. DETAILED DESCRIPTION

[0058] The detailed description set forth below in conjunction with the accompanying drawings is intended as a description of various configurations and is not intended to represent the only configurations in which the concepts described herein may be practiced. This detailed description includes specific details to provide a thorough understanding of the various concepts. However, it will be apparent to those skilled in the art that these concepts may be practiced without these specific details. In some instances, well-known structures and components are shown in block diagram form in order to avoid diluting such concepts.

[0059] Several aspects of telecommunication systems will now be presented with reference to various apparatus and methods. These apparatus and methods will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, components, circuits, processes, algorithms, etc. (collectively referred to as "elements"). These elements may be implemented using electronic hardware, computer software, or any combination thereof. Whether such elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0060] As an example, an element, or any part of an element, or any combination of elements may be implemented as a "processing system" including one or more processors. Examples of processors include: microprocessors, microcontrollers, graphics processing units (GPUs), central processing units (CPUs), application processors, digital signal processors (DSPs), reduced instruction set computing (RISC) processors, systems on chip (SoCs), baseband processors, field programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gating logic, discrete hardware circuits, and other suitable hardware configured to perform various functionalities described throughout this disclosure. One or more processors in a processing system may execute software. Software should be broadly interpreted as meaning instructions, instruction sets, codes, code segments, program codes, programs, subroutines, software components, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether it is described in software, firmware, middleware, microcode, hardware description languages, or other terms.

[0061] Accordingly, in one or more example embodiments, the functions described may be implemented in hardware, software, or any combination thereof. If implemented in software, each function may be stored or encoded on a computer-readable medium as one or more instructions or codes. Computer-readable media include computer storage media. Storage media may be any available medium that can be accessed by a computer. As an example and not limitation, such computer-readable media may include random access memory (RAM), read-only memory (ROM), electrically erasable programmable ROM (EEPROM), optical disk storage, magnetic disk storage, other magnetic storage devices, a combination of computer-readable media of the above types, or any other medium that can be used to store computer-executable code in the form of instructions or data structures that can be accessed by a computer.

[0062] Figure 1 1 is a diagram illustrating an example of a wireless communication system and access network 100. The wireless communication system (also referred to as a wireless wide area network (WWAN)) includes a base station 102, a UE 104, an evolved packet core (EPC) 160, and another core network 190 (e.g., a 5G core (5GC)). The base station 102 may include a macro cell (a high-power cellular base station) and / or a small cell (a low-power cellular base station). A macro cell includes a base station. A small cell includes a femto cell, a pico cell, and a micro cell.

[0063] The base station 102 configured for 4G LTE (collectively referred to as the Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN)) can interface with the EPC 160 via a first backhaul link 132 (e.g., an S1 interface). The base station 102 configured for 5G NR (collectively referred to as the Next Generation RAN (NG-RAN)) can interface with the core network 190 via a second backhaul link 184. Among other functions, the base station 102 can also perform one or more of the following functions: delivery of user data, radio channel encryption and decryption, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity), inter-cell interference coordination, connection establishment and release, load balancing, distribution of non-access stratum (NAS) messages, NAS node selection, synchronization, radio access network (RAN) sharing, multimedia broadcast multicast service (MBMS), subscriber and equipment tracking, RAN information management (RIM), paging, positioning, and delivery of alert messages. The base stations 102 may communicate with each other directly or indirectly (eg, through the EPC 160 or the core network 190) over a third backhaul link 134 (eg, an X2 interface). The first backhaul link 132, the second backhaul link 184, and the third backhaul link 134 may be wired or wireless.

[0064] Base stations 102 may communicate wirelessly with UEs 104. Each base station 102 may provide communication coverage for a respective geographic coverage area 110. There may be overlapping geographic coverage areas 110. For example, a small cell 102' may have a coverage area 110' that overlaps with the coverage area 110 of one or more macro base stations 102. A network that includes both small cells and macro cells may be referred to as a heterogeneous network. A heterogeneous network may also include a home evolved Node B (eNB) (HeNB), which may provide services to a restricted group referred to as a closed subscriber group (CSG). A communication link 120 between a base station 102 and a UE 104 may include an uplink (UL) (also referred to as a reverse link) transmission from the UE 104 to the base station 102 and / or a downlink (DL) (also referred to as a forward link) transmission from the base station 102 to the UE 104. The communication link 120 may use multiple-input multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming, and / or transmit diversity. These communication links may be over one or more carriers. For each carrier allocated in a carrier aggregation of up to Yx MHz (x component carriers) for transmission in each direction, the base station 102 / UE 104 may use a spectrum of up to Y MHz (e.g., 5, 10, 15, 20, 100, 400 MHz, etc.) bandwidth. These carriers may or may not be adjacent to each other. The allocation of carriers may be asymmetric with respect to DL and UL (e.g., more or fewer carriers may be allocated to DL compared to UL). The component carrier may include a primary component carrier and one or more secondary component carriers. The primary component carrier may be referred to as a primary cell (PCell), and the secondary component carrier may be referred to as a secondary cell (SCell).

[0065] Some UEs 104 may communicate with each other using a device-to-device (D2D) communication link 158. The D2D communication link 158 may use DL / UL WWAN spectrum. The D2D communication 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), and a physical sidelink control channel (PSCCH). The D2D communication may be through a variety of wireless D2D communication systems, such as, for example, WiMedia, Bluetooth, ZigBee, Wi-Fi based on the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard, LTE, or NR.

[0066] The wireless communication system may further include a Wi-Fi access point (AP) 150 in communication with a Wi-Fi station (STA) 152 via a communication link 154 in the 5 GHz unlicensed spectrum. When communicating in the unlicensed spectrum, the STA 152 / AP 150 may perform a clear channel assessment (CCA) to determine whether the channel is available prior to communication.

[0067] The small cell 102' may operate in a licensed and / or unlicensed spectrum. When operating in an unlicensed spectrum, the small cell 102' may employ NR and use the same 5 GHz unlicensed spectrum as used by the Wi-Fi AP 150. The small cell 102' employing NR in the unlicensed spectrum may boost the coverage of the access network and / or increase the capacity of the access network.

[0068] Whether a small cell 102' or a large cell (e.g., a macro base station), the base station 102 may include and / or be referred to as an eNB, a gB node (gNB), or another type of base station. Some base stations (such as gNB 180) may operate in traditional sub-6 GHz spectrum, millimeter wave (mmW) frequencies, and / or near mmW frequencies to communicate with UE 104. When the gNB 180 operates in mmW or near mmW frequencies, the gNB 180 may be referred to as a mmW base station. Extremely high frequency (EHF) is part of the RF in the electromagnetic spectrum. EHF has a range of 30 GHz to 300 GHz and a wavelength between 1 mm and 10 mm. The radio waves in this band may be referred to as millimeter waves. Near mmW can extend down to 3 GHz frequencies with a wavelength of 100 mm. The super high frequency (SHF) band extends between 3 GHz and 30 GHz, which is also referred to as centimeter waves. Communications using mmW / near mmW radio frequency (RF) bands (e.g., 3 GHz–300 GHz) have extremely high path loss and short range. The mmW base station 180 may utilize beamforming 182 with the UE 104 to compensate for the extremely high path loss and short range. The base station 180 and the UE 104 may each include multiple antennas, such as antenna elements, antenna panels, and / or antenna arrays to facilitate beamforming.

[0069] Base station 180 may transmit beamformed signals to UE 104 in one or more transmit directions 182'. UE 104 may receive beamformed signals from base station 180 in one or more receive directions 182". UE 104 may also transmit beamformed signals to base station 180 in one or more transmit directions. Base station 180 may receive beamformed signals from UE 104 in one or more receive directions. Base station 180 / UE 104 may perform beam training to determine the best receive direction and transmit direction for each of base station 180 / UE 104. The transmit direction and receive direction of base station 180 may be the same or may be different. The transmit direction and receive direction of UE 104 may be the same or may be different.

[0070] The EPC 160 may include 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 a packet data network (PDN) gateway 172. The MME 162 may be in communication with a home subscriber server (HSS) 174. The MME 162 is a control node that handles signaling between the UE 104 and the EPC 160. In general, the MME 162 provides bearer and connection management. All user Internet Protocol (IP) packets are delivered through the serving gateway 166, which itself is connected to the PDN gateway 172. The PDN gateway 172 provides UE IP address allocation and other functions. The PDN gateway 172 and the BM-SC 170 are connected to IP services 176. The IP services 176 may include the Internet, an intranet, an IP multimedia subsystem (IMS), a PS streaming service, and / or other IP services. The BM-SC 170 may provide functionality for MBMS user service provisioning and delivery. The BM-SC 170 may serve as an entry point for content provider MBMS transmissions, may be used to authorize and initiate MBMS bearer services within a public land mobile network (PLMN), and may be used to schedule MBMS transmissions. The MBMS Gateway 168 may be used to distribute MBMS traffic to base stations 102 belonging to a multicast broadcast single frequency network (MBSFN) area broadcasting a specific service, and may be responsible for session management (start / stop) and for collecting eMBMS related charging information.

[0071] The core network 190 may include an access and mobility management function (AMF) 192, other AMFs 193, a session management function (SMF) 194, and a user plane function (UPF) 195. The AMF 192 may be in communication with a unified data management (UDM) 196. The AMF 192 is a control node that handles signaling between the UE 104 and the core network 190. In general, the AMF 192 provides QoS flow and session management. All user Internet Protocol (IP) packets are delivered through the UPF 195. The UPF 195 provides UE IP address allocation and other functions. The UPF 195 is connected to an IP service 197. The IP service 197 may include the Internet, an intranet, an IP multimedia subsystem (IMS), a packet switching (PS) streaming (PSS) service, and / or other IP services.

[0072] A base station may include and / or be referred to as a gNB, a Node B, an eNB, an access point, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS), an extended service set (ESS), a transmission reception point (TRP), or some other suitable term. The base station 102 provides an access point to the EPC 160 or the core network 190 for the UE 104. Examples of UE 104 include a cellular phone, a smart phone, a Session Initiation Protocol (SIP) phone, a laptop, a personal digital assistant (PDA), a satellite radio, a global positioning system, a multimedia device, a video device, a digital audio player (e.g., an MP3 player), a camera, a game console, a tablet device, a smart device, a wearable device, a vehicle, an electric meter, a gas pump, a large or small kitchen appliance, a health care device, an implant, a sensor / actuator, a display, or any other similar functional device. Some UEs 104 may be referred to as IoT devices (e.g., parking meters, gas pumps, ovens, vehicles, heart monitors, etc.). UE 104 may also be referred to as a station, a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terminology.

[0073] Refer again Figure 1In certain aspects, the base station 180 may include a CSI configuration component 199 configured to configure the UE 104 to report CSI for non-contiguous downlink channels (such as sub-band full-duplex downlink channels), and the UE 104 may include a CSI reporting component 198 configured to report CSI for non-contiguous downlink channels. Although the following description may focus on 5GNR, the concepts described herein may be applicable to other similar fields, such as LTE, LTE-A, CDMA, GSM, and other wireless technologies.

[0074] Figure 2A 200 is a diagram illustrating an example of a first subframe within a 5G / NR frame structure. Figure 2B FIG230 is a diagram illustrating an example of DL channels within a 5G / NR subframe. Figure 2C 250 is a diagram illustrating an example of a second subframe within a 5G / NR frame structure. Figure 2D 280 is a diagram illustrating an example of an UL channel within a 5G / NR subframe. The 5G / NR frame structure can be frequency division duplex (FDD), where for a particular set of subcarriers (carrier system bandwidth), subframes within that subcarrier set are dedicated to either DL or UL; or can be time division duplex (TDD), where for a particular set of subcarriers (carrier system bandwidth), subframes within that subcarrier set are dedicated to both DL and UL. Figure 2A , 2C In the example provided, the 5G / NR frame structure is assumed to be TDD, where subframe 4 is configured with slot format 28 (mostly DL) and subframe 3 is configured with slot format 34 (mostly UL), where D is DL, U is UL, and F is for flexible use between DL / UL. Although subframes 3 and 4 are shown as having slot formats 34 and 28, respectively, any particular subframe may be configured with any of the various available slot formats 0-61. Slot formats 0 and 1 are full DL and full UL, respectively. Other slot formats 2-61 include a mixture of DL, UL, and flexible symbols. The UE is configured with a slot format (dynamically configured by DL control information (DCI) or semi-statically / statically configured by radio resource control (RRC) signaling) through the received slot format indicator (SFI). Note that the following description also applies to the 5G / NR frame structure for TDD.

[0075] Other wireless communication technologies may have different frame structures and / or different channels. A frame (10ms) may be divided into 10 equally sized subframes (1ms). Each subframe may include one or more time slots. A subframe may also include mini-slots, which may include 7, 4, or 2 symbols. Each time slot may include 7 or 14 symbols, depending on the time slot configuration. For time slot configuration 0, each time slot may include 14 symbols, and for time slot configuration 1, each time slot may include 7 symbols. The symbols on the DL may be cyclic prefix (CP) OFDM (CP-OFDM) symbols. The symbols on the UL may be CP-OFDM symbols (for high throughput scenarios) or discrete Fourier transform (DFT) spread OFDM (DFT-s-OFDM) symbols (also known as single carrier frequency division multiple access (SC-FDMA) symbols) (for power-limited scenarios; limited to single stream transmission). The number of time slots within a subframe is based on the time slot configuration and parameter design. For slot configuration 0, different parameter designs μ of 0 to 4 allow 1, 2, 4, 8, and 16 slots per subframe, respectively. For slot configuration 1, different parameter designs 0 to 2 allow 2, 4, and 8 slots per subframe, respectively. Accordingly, for slot configuration 0 and parameter design μ, there are 14 symbols per slot and 2 per subframe. μ time slots. The subcarrier spacing and symbol length / duration vary depending on parameter design. The subcarrier spacing can be equal to 2 μ *15kHz, where μ is parameter design 0 to 4. Thus, parameter design μ=0 has a subcarrier spacing of 15kHz, while parameter design μ=4 has a subcarrier spacing of 240kHz. The symbol length / duration is inversely related to the subcarrier spacing. Figures 2A to 2D An example of a slot configuration 0 with 14 symbols per slot and a parameter design μ=2 of 4 slots per subframe is provided. The slot duration is 0.25 ms, the subcarrier spacing is 60 kHz, and the symbol duration is approximately 16.67 μs. Within a frame set, there may be one or more different bandwidth parts (BWPs) that are frequency division multiplexed (see Figure 2B ). Each BWP can be associated with a specific parameter design.

[0076] A resource grid may be used to represent the frame structure. Each slot includes a resource block (RB) (also called a physical RB (PRB)) extending over 12 consecutive subcarriers. The resource grid is divided into a number of resource elements (REs). The number of bits carried by each RE depends on the modulation scheme.

[0077] like Figure 2A As explained in the illustration, some REs carry reference (pilot) signals (RS) for UEs. RSs may include demodulation RSs (DM-RSs) for channel estimation at the UE (indicated as R for a particular configuration). x, where 100x is the port number, but other DM-RS configurations are possible) and a channel state information reference signal (CSI-RS). RS may also include a beam measurement RS (BRS), a beam refinement RS (BRRS), and a phase tracking RS (PT-RS).

[0078] Figure 2B An example of various DL channels within a subframe of a frame is illustrated. The physical downlink control channel (PDCCH) carries DCI within one or more control channel elements (CCEs), each CCE including 9 RE groups (REGs), each REG including 4 consecutive REs in an OFDM symbol. The PDCCH within one BWP may be referred to as a control resource set (CORESET). Additional BWPs may be located at higher and / or lower frequencies across the channel bandwidth. The primary synchronization signal (PSS) may be within symbol 2 of a particular subframe of a frame. The PSS is used by the UE 104 to determine subframe / symbol timing and physical layer identity. The secondary synchronization signal (SSS) may be within symbol 4 of a particular subframe of a frame. The SSS is used by the UE to determine the physical layer cell identity group number and radio frame timing. Based on the physical layer identity and the physical layer cell identity group number, the UE may determine the physical cell identifier (PCI). Based on the PCI, the UE may determine the location of the aforementioned DM-RS. The physical broadcast channel (PBCH) carrying the master information block (MIB) can be logically grouped with the PSS and SSS to form a synchronization signal (SS) / PBCH block (also referred to as an SS block (SSB)). The MIB provides the number of RBs in the system bandwidth, and the system frame number (SFN). The physical downlink shared channel (PDSCH) carries user data, broadcast system information not transmitted over the PBCH (such as the system information block (SIB)), and paging messages.

[0079] As in Figure 2C As explained in , some REs carry DM-RSs for channel estimation at the base station (indicated as R for one specific configuration, but other DM-RS configurations are possible). The UE may transmit DM-RSs for the physical uplink control channel (PUCCH) and DM-RSs for the physical uplink shared channel (PUSCH). The PUSCH DM-RS may be transmitted in the first or first two symbols of the PUSCH. The PUCCH DM-RS may be transmitted in different configurations depending on whether a short PUCCH or a long PUCCH is transmitted and depending on the specific PUCCH format used. The UE may transmit a sounding reference signal (SRS). The SRS may be transmitted in the last symbol of the subframe. The SRS may have a comb structure, and the UE may transmit the SRS on one of the comb teeth. The SRS may be used by the base station for channel quality estimation to enable frequency-dependent scheduling on the UL.

[0080] Figure 2DAn example of various UL channels within a subframe of an illustration frame. The PUCCH may be located at a position as indicated in one configuration. The PUCCH carries uplink control information (UCI), such as scheduling requests, channel quality indicator (CQI), precoding matrix indicator (PMI), rank indicator (RI), and hybrid automatic repeat request (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.

[0081] Figure 3 3 is a block diagram of a base station 310 in communication with a UE 350 in an access network. In the DL, IP packets from the EPC 160 may be provided to a controller / processor 375. The controller / processor 375 implements layer 3 and layer 2 functionality. Layer 3 includes a radio resource control (RRC) layer, and layer 2 includes a service data adaptation protocol (SDAP) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a media access control (MAC) layer. The controller / processor 375 provides RRC layer functionality associated with broadcasting of system information (e.g., MIB, SIB), RRC connection control (e.g., RRC connection paging, RRC connection establishment, RRC connection modification, and RRC connection release), inter-radio access technology (RAT) mobility, and measurement configuration of UE measurement reports; PDCP layer functionality associated with header compression / decompression, security (ciphering, cipher decryption, integrity protection, integrity verification), and handover support functions; RLC layer functionality associated with delivery of upper layer packet data units (PDUs), error correction through ARQ, concatenation, segmentation and reassembly of RLC service data units (SDUs), re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto transport blocks (TBs), demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization.

[0082] The transmit (TX) processor 316 and the receive (RX) processor 370 implement layer 1 functionality associated with various signal processing functions. Layer 1, including the physical (PHY) layer, may include error detection on the transport channel, forward error correction (FEC) coding / decoding of the transport channel, interleaving, rate matching, mapping to the physical channel, modulation / demodulation of the physical channel, and MIMO antenna processing. The TX processor 316 handles the mapping to the signal constellation based on various modulation schemes (e.g., binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), M-phase shift keying (M-PSK), M-quadrature amplitude modulation (M-QAM)). The coded and modulated symbols may then be split into parallel streams. Each stream may then be mapped to an OFDM subcarrier, multiplexed with a reference signal (e.g., pilot) in the time and / or frequency domain, and then combined together using an inverse fast Fourier transform (IFFT) to produce a physical channel carrying a time domain OFDM symbol stream. The OFDM stream is spatially precoded to generate multiple spatial streams. Channel estimates from a channel estimator 374 may be used to determine coding and modulation schemes and for spatial processing. The channel estimates may be derived from reference signals and / or channel condition feedback transmitted by the UE 350. Each spatial stream may then be provided to a different antenna 320 via a separate transmitter 318TX. Each transmitter 318TX may modulate an RF carrier with a corresponding spatial stream for transmission.

[0083] At the UE 350, each receiver 354RX receives a signal through its corresponding antenna 352. Each receiver 354RX recovers the information modulated onto the RF carrier and provides the information to a receive (RX) processor 356. The TX processor 368 and the RX processor 356 implement layer 1 functionality associated with various signal processing functions. The RX processor 356 can perform spatial processing on the information to recover any spatial stream destined for the UE 350. If there are multiple spatial streams destined for the UE 350, they can be combined into a single OFDM symbol stream by the RX processor 356. The RX processor 356 then transforms the OFDM symbol stream from the time domain to the frequency domain using a fast Fourier transform (FFT). The frequency domain signal includes a separate OFDM symbol stream for each subcarrier of the OFDM signal. The symbols on each subcarrier and the reference signal are recovered and demodulated by determining the signal constellation point most likely transmitted by the base station 310. These soft decisions can be based on the channel estimates calculated by the channel estimator 358. These soft decisions are then decoded and deinterleaved to recover the data and control signals originally transmitted on the physical channel by the base station 310. These data and control signals are then provided to the controller / processor 359 which implements layer 3 and layer 2 functionality.

[0084] The controller / processor 359 may be associated with a memory 360 that stores program codes and data. The memory 360 may be referred to as a computer readable medium. In the UL, the controller / processor 359 provides demultiplexing between transport channels and logical channels, packet reassembly, cipher interpretation, header decompression, and control signal processing to recover IP packets from the EPC 160. The controller / processor 359 is also responsible for error detection using ACK and / or NACK protocols to support HARQ operations.

[0085] Similar to the functionality described in conjunction with DL transmissions performed by the base station 310, the controller / processor 359 provides RRC layer functionality associated with system information (e.g., MIB, SIB) acquisition, RRC connection, and measurement reporting; PDCP layer functionality associated with header compression / decompression, and security (encryption, decryption, integrity protection, integrity verification); RLC layer functionality associated with delivery of upper layer PDUs, error correction through ARQ, concatenation, segmentation, and reassembly of RLC SDUs, resegmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing MAC SDUs onto TBs, demultiplexing MAC SDUs from TBs, scheduling information reporting, error correction through HARQ, priority handling, and logical channel prioritization.

[0086] Channel estimates derived by a channel estimator 358 from a reference signal or feedback transmitted by the base station 310 may be used by a TX processor 368 to select the appropriate coding and modulation schemes, and to facilitate spatial processing. The spatial streams generated by the TX processor 368 may be provided to different antennas 352 via separate transmitters 354TX. Each transmitter 354TX may modulate an RF carrier with a corresponding spatial stream for transmission.

[0087] UL transmissions are processed at the base station 310 in a manner similar to that described in conjunction with the receiver functionality at the UE 350. Each receiver 318RX receives a signal through its respective antenna 320. Each receiver 318RX recovers information modulated onto an RF carrier and provides the information to a RX processor 370.

[0088] The controller / processor 375 may be associated with a memory 376 that stores program codes and data. The memory 376 may be referred to as a computer readable medium. In the UL, the controller / processor 375 provides demultiplexing between transport channels and logical channels, packet reassembly, cipher decoding, header decompression, control signal processing to recover IP packets from the UE 350. The IP packets from the controller / processor 375 may be provided to the EPC 160. The controller / processor 375 is also responsible for error detection using ACK and / or NACK protocols to support HARQ operations.

[0089] At least one of the TX processor 368, the RX processor 356, and the controller / processor 359 may be configured to perform operations related to Figure 1 The 198 combined aspects.

[0090] At least one of the TX processor 316, the RX processor 370, and the controller / processor 375 may be configured to perform operations related to Figure 1 The 198 combined aspects.

[0091] Figure 4A 4 is a diagram 400 illustrating a base station 404 communicating with a first UE 412 and a second UE 422. The base station 404 may transmit a downlink signal 406 to the first UE 412 and may simultaneously receive an uplink signal 408 on other resources from the second UE 422. Since the first UE 412 and the second UE 422 transmit or receive only a single signal at a given time, they may be configured to operate in half-duplex mode (e.g., the uplink and downlink may be time division duplex).

[0092] Figure 4B 4 is a diagram 450 illustrating that a UE 442 utilizes full-duplex communication with a base station 434. The base station 434 may transmit a downlink signal 436 to the UE 442. The UE 442 may receive the downlink signal 436 from the base station 434 and may simultaneously transmit an uplink signal 438 to the base station 434. The downlink signal 436 and the uplink signal 438 may be frequency division duplexed (FDD) within a component carrier bandwidth (e.g., on resources having the same time but different carrier frequencies), and the UE 442 may be configured to operate in full-duplex mode (e.g., configured to be able to transmit and receive simultaneously).

[0093] In some aspects, the downlink signal 436 and the uplink signal 438 may be sub-band frequency division duplexed. A first set of frequency resources may be allocated to the downlink, and a second set of frequency resources may be allocated to the uplink. There may be a guard band between the frequency resources allocated to the downlink and the frequency resources allocated to the uplink to prevent or reduce interference.

[0094] Figure 5 5 is a diagram illustrating various resource bandwidth time slot configurations. A UE may be configured with various resource bandwidths. For example, a base station may configure a resource bandwidth for a UE via an RRC configuration message. An uplink channel and a downlink channel may have separate resource bandwidths. In each time slot, a single resource bandwidth may be active. A resource bandwidth may identify resources within an active bandwidth portion of a channel allocation. For example, a resource bandwidth may identify resources allocated for a PDSCH in a given time slot.

[0095] The base station may dynamically indicate to the UE which resource bandwidth to use for the channel in a given time slot. For example, the base station may include in the DCI an indication identifying the resource bandwidth to be used for the channel in the time slot. Since the UE is already configured with the resource bandwidth, and switching between resource bandwidths does not require the UE to change the active bandwidth portion, the UE may experience little delay associated with switching between resource bandwidths from the first time slot to the next time slot.

[0096] like Figure 5 , the UE may have an active bandwidth portion 510 and may be configured with a first resource bandwidth 532, a second resource bandwidth 534, a third resource bandwidth 536, and a fourth resource bandwidth 538 for the active bandwidth portion 510. The base station may allocate resources of the active bandwidth portion 510 to the channel by identifying the resource bandwidth for the channel in a given time slot. The base station may configure (e.g., dynamically configure) the UE to utilize the first resource bandwidth 532 in the first time slot 522, utilize the second resource bandwidth 534 in the second time slot 524, utilize the third resource bandwidth 536 in the third time slot 526, and utilize the fourth resource bandwidth 538 in the fourth time slot 528.

[0097] Some resource bandwidths may span the entire active bandwidth portion, indicating that the entire active bandwidth portion is allocated for the channel. For example, the first resource bandwidth 532 may indicate that the entire first time slot 522 of the active bandwidth portion 510 is allocated to the corresponding channel. Some resource bandwidths may span only a portion of the active bandwidth portion, indicating that the portion of the active bandwidth portion is allocated for the channel. For example, the second resource bandwidth 534 and the fourth resource bandwidth 538 may indicate that different portions of the second time slot 524 and the fourth time slot 528, respectively, are allocated to the channel. The remainder of the active bandwidth portion may be allocated to another channel.

[0098] The resource bandwidth may be non-contiguous. For example, the third resource bandwidth 536 identifies a first resource set 541 and a second resource set 542. The space 543 between the first resource set 541 and the second resource set 542 corresponds to the resources in the time slot that are not allocated to the channel. Accordingly, in the third time slot 526, the first resource set 541 and the second resource set 542 may be allocated to the channel, but the resources between the first resource set 541 and the second resource set 542 may not be allocated to the channel. The base station may allocate the resources between the first resource set 541 and the second resource set 542 to another channel, resulting in the insertion of a different channel between the first part of the channel and the second part of the channel in the frequency domain. For example, Figure 5 The resource bandwidth may identify resources allocated to the PDSCH, the first resource set 541 and the second resource set 542 may be allocated to the PDSCH in the third time slot 526, and the resources between the first resource set 541 and the second resource set 542 may be allocated to the PUSCH.

[0099] Figure 6 600 is a diagram illustrating a time slot configuration with sub-band full-duplex downlink and uplink channels. These downlink and uplink channels (including data channels and corresponding control channels) may be in an unpaired time division duplex spectrum. In some aspects, as described above, resource bandwidth may be allocated for downlink channels in a first time slot 622, a second time slot 624, a third time slot 626, and a fourth time slot 628. Separate resource bandwidth may be allocated for uplink channels in a second time slot 624, a third time slot 626, and a fourth time slot 628. A resource bandwidth identifying no resources may be configured for an uplink channel in a first time slot 622, or a resource bandwidth may not be configured for an uplink channel in a first time slot 622.

[0100] In some aspects, a UE may be configured to operate in full-duplex mode, and both downlink channels and uplink channels may be available to the UE (e.g., Figure 4B In some aspects, a UE may be configured to operate in half-duplex mode, and a downlink channel may be used for the UE and an uplink channel may be allocated to another UE, or an uplink channel may be used for the UE and a downlink channel may be allocated to another UE (e.g., as Figure 4A as depicted in ).

[0101] The downlink channel may include a downlink data channel and a downlink control channel. The uplink channel and the downlink channel may be frequency-division duplexed in the component carrier bandwidth of the UE. The entire component carrier bandwidth may be allocated to the downlink data channel 632 and the corresponding downlink control channel in the first time slot 622. In the second time slot 624, the third time slot 626, and the fourth time slot 628, the downlink channel may be frequency-division duplexed with the uplink channel, wherein the uplink channel is allocated resources inserted between the resources of the downlink channel. For example, in the second time slot 624, the resources allocated to the uplink data channel 635 may be inserted between the resources allocated to the downlink data channel 634. In the third time slot 626, the resources allocated to the uplink data channel 637 may be inserted between the resources allocated to the downlink data channel 636. In the fourth time slot 628, the resources allocated to the uplink data channel 639 may be inserted between the resources allocated to the downlink data channel 638. A guard band may be included between resources allocated to the uplink channel and resources allocated to the downlink channel in the second time slot 624, the third time slot 626, and the fourth time slot 628.

[0102] In a system without a sub-band full-duplex downlink, the downlink and uplink channels can be time-division duplexed by allocating the first, second, and third time slots to the downlink channel and the fourth time slot to the uplink channel. In such a system, the number of resources allocated to the uplink channel and the number of resources allocated to the downlink channel can be the same as Figure 6 In some aspects, the number of resources depicted in the uplink channel and the downlink channel may be the same or similar. In some aspects, by including the resources allocated to both the uplink channel and the downlink channel in the same time slot, latency may be improved. For example, uplink latency may be improved because the UE may not need to wait for the time slot allocated to the uplink channel to transmit uplink data. In some aspects, by including the resources allocated to both the uplink channel and the downlink channel in the same time slot, coverage may be improved. For example, in a given time slot where fewer resources are used to transmit uplink data, the UE may be able to dedicate more transmit power to transmit uplink data on those resources in the time slot.

[0103] Figure 7 is a communication flow diagram 700 illustrating channel state information (CSI) reporting for a sub-band full-duplex downlink channel.

[0104] The base station 704 may transmit a sub-band full-duplex downlink channel 712 to the UE 702. The downlink channel 712 may be non-contiguous (e.g., another channel such as an uplink channel may be inserted between two portions of the downlink channel 712). The downlink channel 712 may include a CSI-RS on one or more symbols. Since the downlink channel 712 may be non-contiguous, the CSI-RS may not be included on resources not allocated to the downlink channel 712 and may therefore also not be contiguous. The UE 702 may receive the downlink channel 712 and the CSI-RS.

[0105] As illustrated at 714, the UE 702 may generate a CSI report for the downlink channel 712. The CSI report may be based on the CSI-RS. The CSI report may include channel quality information (CQI), rank indicator (RI), and / or precoding matrix indicator (PMI) about the downlink channel 712. Although the downlink channel 712 may not be contiguous, the CSI report may include a wideband CQI, a single rank, and / or PMI about the downlink channel 712. The UE 702 may transmit a single CSI report 716 to the base station 704, reporting channel state information about the entire non-contiguous downlink channel 712.

[0106] Figure 8 8 is a diagram illustrating CSI-RS for a sub-band full-duplex downlink channel. The UE may have an active bandwidth portion 810. In a first time slot 824, the UE may have resources allocated for a non-contiguous downlink channel including a first portion 834 and a second portion 836 and for an uplink channel 835 between the first portion 834 and the second portion 836 of the downlink channel.

[0107] The base station may transmit the downlink channel to the UE and may include the CSI-RS on a symbol 825 of a first slot 824. The CSI-RS may be received on a first CSI reference resource (e.g., a CSI-RS resource or a CSI-IM resource) 842 and a second CSI reference resource 844. For a first portion 834 of a non-contiguous downlink channel, the first CSI reference resource 842 may be on symbol 825, and for a second portion 836 of a non-contiguous data channel 834, the second CSI reference resource 842 may be on symbol 825.

[0108] The UE may generate a single CSI report associated with both the first CSI reference resource 842 and the second CSI reference resource 844. The report may include a single CQI, RI, and / or PMI, thereby providing a single wideband channel estimate for the downlink channel even if the downlink channels are non-contiguous.

[0109] Fig. 9 is a communication flow diagram 900 illustrating CSI reporting for a sub-band full-duplex downlink channel based on a CSI-RS with multiple CSI reference resources.

[0110] The base station 904 can transmit a sub-band full-duplex downlink channel 912 to the UE 902. The downlink channel 912 can be non-contiguous (e.g., another channel (such as an uplink channel) and a guard band can be inserted between two portions of the downlink channel 912). The downlink channel 912 may include a CSI-RS (e.g., a CSI-RS or a CSI-IM) transmitted on multiple CSI reference resources, where there is one CSI reference resource on each non-contiguous portion of the downlink channel 912.

[0111] UE 902 may receive downlink channel 912 and CSI-RS on multiple CSI reference resources. As illustrated at 914, UE 902 may generate a single CSI report for downlink channel 912 based on multiple CSI reference resources. For example, UE 902 may generate a single CSI report for downlink channel 912 as described above with respect to Figure 8 The CSI report is generated as discussed. The UE 902 may then transmit the CSI report 916 to the base station 904.

[0112] In some aspects, different time slots may have different channel configurations. While the downlink channel 912 may be sub-band full-duplex in one time slot, the downlink may not be sub-band full-duplex or may only be half-duplex in another frequency band. For example, Figure 6 As shown in , the downlink channel 634 performs sub-band full-duplexing with the uplink channel 635 in the second time slot 624, but the downlink channel 632 is only half-duplexing in the first time slot 622. Referring again to Fig. 9 In some aspects, as illustrated at 926, the UE 902 may determine whether to generate a single CSI report based on multiple CSI reference resources (e.g., to report channel quality for sub-band full-duplex time slots) or to generate a CSI report based on a single CSI reference resource (e.g., to report channel quality for half-duplex time slots). The UE 902 may have two CSI time slot sets defined, one for sub-band full-duplex time slots and another for non-full-duplex time slots (e.g., half-duplex time slots). CSI reference resources may be defined for each CSI time slot set, and the CSI report 916 may include a field indicating which CSI reference resource is used for the CSI report 916.

[0113] In some aspects, at 926, the UE 902 may determine whether to generate a single CSI report based on multiple CSI reference resources based on the reporting indication 922. The base station 904 may transmit the reporting indication 922 to the UE 902. The reporting indication 922 may explicitly indicate to the UE 902 whether to utilize a CSI reporting format that reports channel quality based on a single CSI reference resource or to utilize a CSI reporting format that reports channel quality based on the multiple CSI reference resources that is associated with multiple CSI reference resources. For example, since the downlink channel 912 may be sub-band full-duplex, the reporting indication 922 may direct the UE 902 to utilize a CSI reporting format that is associated with multiple CSI reference resources. At 926, based on the reporting indication 922 directing the UE 902 to utilize a CSI reporting format that is associated with multiple CSI reference resources, the UE 902 may determine to generate a single CSI report based on multiple CSI reference resources in the downlink channel 912.

[0114] In some aspects, at 926, the UE 902 may determine whether to generate a single CSI report based on multiple CSI reference resources based on the full-duplex (FD) indication 924. The base station 904 may transmit the FD indication 924 to the UE 902. The FD indication 924 may indicate whether the downlink channel associated with the FD indication 924 is sub-band full-duplex or non-full-duplex (e.g., half-duplex) for the associated time slot. For example, the downlink channel 912 may be sub-band full-duplex, so the FD indication 924 may indicate to the UE 902 that the downlink channel 912 is sub-band full-duplex. At 926, based on the FD indication 924 indicating that the downlink channel 912 is sub-band full-duplex, the UE 902 may determine to generate a single CSI report based on multiple CSI reference resources in the downlink channel 912.

[0115] In some aspects, at 926, the UE 902 may determine whether to generate a single CSI report for the time slot based on the time slot format used for the time slot (e.g., based on a time slot format indication (SFI)). For example, the time slot may be configured for sub-band full-duplex, thereby including resources allocated to an uplink channel and resources allocated to a downlink channel. However, the base station 904 may determine not to schedule uplink data transmission in the uplink channel. The UE 902 may determine that the uplink channel is not used in the time slot and may fall back to half-duplex mode, thereby generating a CSI report for the entire sub-band full-duplex time slot based on a single CSI reference. The UE 902 may transmit a report indication 928 to the base station 904 along with the CSI report 916. The report indication 928 may be a CSI-RS resource indicator (CRI). The report indication 928 may indicate to the base station 904 whether the CSI report 916 is generated based on a single CSI reference resource or based on multiple CSI reference resources.

[0116] Fig.10 1000 is a diagram illustrating CSI-RS for a sub-band full-duplex downlink channel. A UE may have an active bandwidth portion 1010. In a first time slot 1024, the UE may have resources allocated for a non-contiguous downlink channel including a first portion 1034 and a second portion 1036 and for an uplink channel 1035 between the first portion 1034 and the second portion 1036 of the downlink channel.

[0117] The base station may transmit the downlink channel to the UE and may include the CSI-RS on the symbol 1025 of the first time slot 1024. The CSI-RS may be received on a single CSI reference resource 1042 for the downlink channel in the entire active bandwidth 1010 of the time slot 1024. However, the base station may not transmit the CSI-RS on resources of the CSI reference resource 1042 that are not included in the downlink channel (e.g., these resources may be punctured, or these resources may be muted). For example, the base station may transmit the CSI-RS on resources 1051 in the first portion 1034 of the downlink channel and resources 1053 in the second portion 1036 of the downlink channel of the CSI reference resource 1042, but may not transmit the CSI-RS on resources 1052 of the CSI reference resource 1042 that are allocated to the uplink data channel 1035 or a guard band that separates the uplink data channel 1035 from the first portion 1034 and the second portion 1036 of the downlink channel.

[0118] Fig.11 1100 is a diagram illustrating a CSI resource configuration bitmap. Fig.10 As discussed, the base station may transmit the CSI-RS on a single CSI reference resource 1142 of the UE for the active bandwidth portion 1110. The CSI reference resource 1142 may be used for a sub-band full-duplex time slot, and the base station may transmit the CSI-RS on a first resource set 1151 and a second resource set 1153 in a downlink channel, but may not transmit the CSI-RS in a third resource set 1152 allocated to an uplink data channel or allocated to a guard band separating the uplink data channel from the downlink channel.

[0119] The base station may transmit a CSI resource configuration associated with the CSI reference resource 1142 to the UE. In some aspects, the base station may transmit the CSI resource configuration in an RRC message. The CSI resource configuration may include a starting resource block (RB) index and a number of RBs associated with the CSI reference resource 1142, which may define the resources of the CSI reference resource 1142. The CSI resource configuration may include a CSI resource allocation bitmap 1160. Each bit in the bitmap may correspond to a group of resources of the CSI reference resource 1142. For example, each bit may correspond to a resource block (RB), or each bit may correspond to a resource block group (RBG). The bits corresponding to the resources that are in the downlink channel and will receive the CSI-RS may be set to "high" or "1". The bits corresponding to the resources that are not in the downlink channel and will not receive the CSI-RS may be set to "low" or "0". For example, with reference to Fig.11 , in the CSI resource configuration bitmap 1160, the first bit set 1161 may correspond to the first resource set 1151, the second bit set 1163 may correspond to the second resource set 1153, and the third bit set 1162 may correspond to the third resource set 1152. The first bit set 1161 and the second bit set 1163 may be set to "high" or "1" because the CSI-RS will be transmitted on the first resource set 1151 and the second resource set 1153. The third bit set 1162 may be set to "low" or "0" because the third resource set 1152 is allocated to the uplink channel or the guard band, and the CSI-RS will therefore not be transmitted on the third resource set 1152.

[0120] Based on the bitmap 1160 in the CSI resource configuration, the UE can determine which resources contain the CSI-RS for the downlink when receiving the CSI-RS on the CSI reference resources 1142. The UE can receive the CSI-RS for the two non-contiguous parts of the downlink without having two separately defined CSI reference resources (e.g., a single starting RB index and a single number of RBs define the CSI reference resource 1142).

[0121] In some aspects, as described above (e.g., regarding Figure 5 ), a UE may be configured with multiple resource bandwidths in the active bandwidth portion for the UE. In some aspects, each resource bandwidth may be configured with a CSI resource configuration bitmap, including a sub-band full-duplex resource bandwidth, an intra-band full-duplex resource bandwidth, and a non-full-duplex resource bandwidth (e.g., a half-duplex resource bandwidth). For example, referring to Figure 5, the first resource bandwidth 532 may be configured with a bitmap containing all "high" or all "1" bits, indicating that the entire active bandwidth 510 may be used for CSI reference resources received in a time slot having the first resource bandwidth 532. The second resource bandwidth 534 and the fourth resource bandwidth 538 may be configured with a bitmap having one "high" or "1" bit segment corresponding to downlink resources in those resource bandwidths and one "low" or "0" bit segment corresponding to other resources of the active bandwidth 510. The third resource bandwidth 536 may be configured with a bitmap having two "high" or "1" bit segments separated by a "low" or "0" bit segment. The UE may utilize the bitmap to obtain the resource bandwidth when monitoring the CSI reference resources received in a time slot having the resource bandwidth.

[0122] In some aspects, the CSI reference resource configuration bitmap may be applied to all CSI reference resources in a bandwidth part. Separate CSI resource configuration bitmaps may be configured for different bandwidth parts, and whenever a bandwidth part is an active bandwidth part, the CSI resource configuration bitmap for that bandwidth part may be applied to all CSI reference resources.

[0123] As discussed above, the bits of the CSI resource configuration bitmap may correspond to RBGs. An RBG may be a group of RBs. In some aspects, an RBG may be configured separately for each CSI reference resource. In some aspects, a first RBG configuration may be applied to a first set of CSI reference resources, and a second RBG configuration may be applied to a second set of CSI reference resources. In some aspects, the same RBG configuration may be applied to all CSI reference resources associated with a CSI report.

[0124] A segment may refer to a set of bits with the same value in a bitmap. Fig.11 , the CSI resource allocation bitmap 1160 may include three segments - a first segment corresponding to a first bit set 1161, a second segment corresponding to a second bit set 1163, and a third segment corresponding to a third bit set 1162. Each segment may correspond to a portion of a non-contiguous channel, or a space between portions of a non-contiguous channel. In some aspects, the CSI resource configuration bitmap may have a maximum number of segments. For example, the maximum number of segments may be three. The UE may not be able to provide accurate channel estimation based on a CSI-RS received on a CSI reference resource with too many segments. In some aspects, the CSI resource configuration bitmap may have a minimum number of bits per segment.

[0125] A tracking reference signal may be transmitted on CSI reference resources in multiple time slots, and one or more of these CSI reference resources may have a CSI resource configuration bit map for the time slot. However, in the case where the CSI resource configuration bit map mutes or punctures the bits of the tracking reference signal received in the time slot, the UE may not be able to accurately perform frequency or time tracking based on the tracking reference signal. In some aspects, in the case where the UE receives a tracking reference signal on a CSI reference resource and determines that one or more bits of the CSI resource configuration bit map for the CSI reference resource used for the time slot are muted or punctured, the UE may regard all RBGs of the CSI reference resource as being muted or punctured. In some aspects, the UE may compare the muted bits of the CSI reference resource with the bits of those CSI reference resources in other time slots that receive tracking reference signals. In the case where the CSI resource configuration bit map includes a muted bit that is not muted for a CSI reference resource that received a tracking reference signal in a previous time slot, the UE may regard the entire CSI reference resource for the time slot as being muted.

[0126] The UE may be configured with a parameter that determines whether the UE has a time constraint for channel measurement. Based on the parameter, the UE may delay transmitting a CSI report based on a received CSI reference signal until the CSI reference resource. In some aspects, a single CSI reference resource may be associated with both a sub-band full-duplex report and a non-full-duplex report. In the case where the UE transmits a CSI report in a later time slot, the later time slot may be a sub-band full-duplex time slot, or may be a non-full-duplex time slot. In some aspects, the UE may delay transmitting a CSI report based on a CSI reference resource in a sub-band full-duplex time slot until another sub-band full-duplex time slot, or may delay transmitting a CSI report based on a CSI reference resource in a non-full-duplex time slot until another non-full-duplex time slot.

[0127] In some aspects, the UE may receive CSI-RS on CSI reference resources configured for non-full-duplex time slots on time slots configured for sub-band full-duplex. In some aspects, the UE may completely discard the received CSI-RS. In some aspects, the UE may apply a CSI resource configuration bitmap for sub-band full-duplex time slots to the CSI-RS to ignore portions of the CSI-RS outside of the downlink channel for the time slot, and may utilize the remainder of the CSI-RS for channel estimation.

[0128] Fig.12 1200 is a flow chart of a wireless communication method. The method may be performed by a UE (eg, UE 104, 702, 902).

[0129] At 1202, the UE may receive a full-duplex (FD) downlink channel from a base station, the FD downlink channel being duplexed with a second FD channel having a carrier frequency between a carrier frequency of a first portion of the FD downlink channel and a carrier frequency of a second portion of the FD downlink channel.

[0130] At 1204, the UE may receive a channel state information reference signal (CSI-RS) from a base station on resources having a first symbol in a first portion of the FD downlink channel and resources having a first symbol in a second portion of the FD downlink channel.

[0131] At 1206, the UE may transmit a channel state information (CSI) report to the base station based on the CSI-RS received on the first portion and the second portion.

[0132] In some aspects, a first CSI reference resource may be received on a first portion of the FD downlink channel, a second CSI reference resource may be received on a second portion, and the CSI report may be based on both the first CSI reference resource and the second CSI reference resource. The CSI report may include a single channel estimate based on both the first CSI reference resource and the second CSI reference resource.

[0133] In some aspects, the UE may receive a report indication for a time slot from a base station, wherein the UE may determine based on the report indication that a CSI report is to be generated for the time slot based on both the first CSI reference resource and the second CSI reference resource. In some aspects, the UE may receive a duplex state indication for a time slot from a base station, wherein the UE may determine based on the duplex state indication that a CSI report is to be generated for the time slot based on both the first CSI reference resource and the second CSI reference resource. In some aspects, the UE may determine that a CSI report is to be generated for the time slot based on both the first CSI reference resource and the second CSI reference resource, and may transmit a report indication to the base station indicating that the CSI report is to be generated for the time slot based on both the first CSI reference resource and the second CSI reference resource.

[0134] The CSI-RS may be received on a single CSI reference resource on both the first part and the second part, and the CSI report is based on the single CSI reference resource. The CSI-RS may not be received on a resource having the codeword of the single CSI reference resource on the second FD channel. The UE may receive a CSI resource configuration for the CSI reference resource, which identifies the frequency domain configuration for the single CSI reference resource. The CSI resource configuration may include a bit map identifying resources associated with a single CSI reference resource. Each bit of the bit map may correspond to a resource block group for a single CSI reference resource, and may identify whether the CSI-RS is received on the corresponding resource block group. The UE may be configured with multiple resource bandwidths, wherein each resource bandwidth in the multiple resource bandwidths is configured with a separate resource block group configuration, wherein the FD downlink channel is associated with an active resource bandwidth in the multiple resource bandwidths, and wherein the bit map corresponds to the resource block group of the active resource bandwidth.

[0135] The UE may have a maximum number of disjoint allocations that may be associated with a single CSI reference resource. The UE may have a minimum number of physical resource blocks that may be associated with each disjoint allocation of a single CSI reference resource.

[0136] In some aspects, the UE may determine that the CSI-RS is a tracking reference signal, may determine that the CSI-RS is not received on the resources of the second FD channel, and may silence the CSI-RS received on the resources of the first portion of the FD downlink channel and the resources of the second portion of the FD downlink channel.

[0137] Fig.13 1300 is a flow chart of a wireless communication method. The method may be performed by a base station (eg, base station 102, 180, 704, 904).

[0138] At 1302, a base station may transmit to a user equipment (UE) a full-duplex (FD) downlink channel, the FD downlink channel being duplexed with a second FD channel, wherein the second FD channel has a carrier frequency between a carrier frequency of a first portion of the FD downlink channel and a carrier frequency of a second portion of the FD downlink channel;

[0139] At 1304, the base station may transmit a channel state information reference signal (CSI-RS) to the UE on resources having a first symbol in a first portion of the FD downlink channel and resources having a first symbol in a second portion of the FD downlink channel; and

[0140] At 1306, the base station may receive a channel state information (CSI) report from the UE based on the CSI-RS transmitted on the first portion and the second portion.

[0141] In some aspects, a first CSI reference resource may be transmitted on a first portion of the FD downlink channel, a second CSI reference resource may be transmitted on a second portion, and the CSI report may be based on both the first CSI reference resource and the second CSI reference resource. The CSI report may include a single channel estimate based on both the first CSI reference resource and the second CSI reference resource.

[0142] In some aspects, the base station may transmit a report indication for a time slot to the UE, wherein the report indication may indicate to the UE that a CSI report is to be generated for the time slot based on both the first CSI reference resource and the second CSI reference resource. In some aspects, the base station may transmit a duplex state indication for the time slot to the UE, wherein the duplex state indication may indicate to the UE that the FD downlink channel is duplexed with the second FD channel, and the UE may generate a CSI report for the time slot based on both the first CSI reference resource and the second CSI reference resource based on the duplex state indication. In some aspects, the base station may receive a report indication from the UE indicating that the CSI report is to be based on both the first CSI reference resource and the second CSI reference resource for the time slot.

[0143] The CSI-RS may be transmitted on a single CSI reference resource on both the first part and the second part, and the CSI report may be based on the single CSI reference. The CSI-RS may not be transmitted on the resource having the codeword of the single CSI reference resource on the second FD channel. The base station may transmit a CSI resource configuration for the CSI reference resource, which identifies the frequency domain configuration for the single CSI reference resource. The CSI resource configuration may include a bit map identifying resources associated with a single CSI reference resource. Each bit of the bit map may correspond to a resource block group for a single CSI reference resource, and may identify whether the CSI-RS is received on the corresponding resource block group. The UE may be configured with multiple resource bandwidths, wherein each resource bandwidth in the multiple resource bandwidths is configured with a separate resource block group configuration, wherein the FD downlink channel is associated with an active resource bandwidth in the multiple resource bandwidths, and wherein the bit map corresponds to the resource block group of the active resource bandwidth.

[0144] The UE may have a maximum number of disjoint allocations that may be associated with a single CSI reference resource. The UE may have a minimum number of physical resource blocks that may be associated with each disjoint allocation of a single CSI reference resource.

[0145] Fig.14 1400 is a flow chart of a wireless communication method. The method may be performed by a UE (eg, UE 104, 702, 902).

[0146] At 1402, the UE may receive a full-duplex (FD) downlink channel from a base station. The FD downlink channel may be duplexed with a second FD channel having a carrier frequency between a carrier frequency of a first portion of the FD downlink channel and a carrier frequency of a second portion of the FD downlink channel.

[0147] At 1404, the UE may receive a channel state information reference signal (CSI-RS) from a base station on resources having a first symbol for a first portion of the FD downlink channel and resources having a first symbol for a second portion of the FD downlink channel. The UE may be configured with a first CSI reference resource, the first CSI reference resource comprising resources for the first portion of the FD downlink channel and resources for the second portion of the FD downlink channel. The first CSI reference resource may not include resources for the second FD channel. The UE may be configured with a second CSI reference resource, the second CSI reference resource comprising resources for the first portion of the FD downlink channel, resources for the second portion of the FD downlink channel, and resources for the second FD channel.

[0148] At 1406, the UE may determine whether the CSI-RS is received on the first CSI reference resource or the second CSI reference resource.

[0149] At 1408, upon determining that the CSI-RS is received on the first CSI reference resource, the UE may transmit a channel state information (CSI) report to the base station based on the CSI-RS.

[0150] In some aspects, upon determining that the CSI-RS is received on the second CSI reference resource, the UE may drop the CSI-RS at 1410. The UE may not transmit a CSI report based on the CSI-RS.

[0151] In some aspects, upon determining that the CSI-RS is received on the second CSI reference resource, the UE may discard a portion of the CSI-RS received on the resources of the second FD channel at 1412. At 1414, the UE may transmit a channel state information (CSI) report to the base station based on the CSI-RS received on the first portion and the second portion of the FD downlink channel.

[0152] Fig.15 1500 is a flow chart of a wireless communication method. The method may be performed by a base station (eg, base station 102, 180, 704, 904).

[0153] At 1502, a base station may transmit a full-duplex (FD) downlink channel to a user equipment (UE). The FD downlink channel may be duplexed with a second FD channel having a carrier frequency between a carrier frequency of a first portion of the FD downlink channel and a carrier frequency of a second portion of the FD downlink channel.

[0154] At 1504, the base station may transmit a channel state information reference signal (CSI-RS) to the UE on resources having a first symbol for a first portion of the FD downlink channel and resources having a first symbol for a second portion of the FD downlink channel. The UE may be configured with a first CSI reference resource including resources for the first portion of the FD downlink channel and resources for the second portion of the FD downlink channel. The first CSI reference resource may not include resources for the second FD channel. The UE may be configured with a second CSI reference resource including resources for the first portion of the FD downlink channel, resources for the second portion of the FD downlink channel, and resources for the second FD channel.

[0155] At 1508, if the CSI-RS is transmitted on the first CSI reference resource, the base station may receive a CSI report from the UE based on the CSI-RS.

[0156] In some aspects, at 1510, the base station may not receive a CSI report based on the CSI-RS if the CSI-RS is transmitted on the second CSI reference resource.

[0157] In some aspects, at 1512, if the CSI-RS is transmitted on a second CSI reference resource, the base station may receive a CSI report from the UE based on the CSI-RS transmitted on the first and second portions of the FD downlink channel, but not based on the portion of the CSI-RS transmitted on the resources of the second FD channel.

[0158] It should be understood that the specific order or hierarchy of each box in the disclosed process / flowchart is an illustration of an example approach. It should be understood that the specific order or hierarchy of each box in these process / flowcharts can be rearranged based on design preferences. In addition, some boxes can be combined or omitted. The attached method claims present the elements of various boxes in an exemplary order and are not meant to be limited to the specific order or hierarchy presented.

[0159] The previous description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be easily understood by those skilled in the art, and the universal principles defined in this article can be applied to other aspects. Thus, the claims are not intended to be limited to the aspects shown in this article, but should be granted the full scope consistent with the claims in language, wherein the singular reference of the elements is not intended to represent "there is and only one", but "one or more", unless otherwise stated. Terms such as "if", "when ..." and "when ..." should be interpreted as meaning "under the condition", rather than implying a direct time relationship or reaction. That is, these phrases (for example, "when ...") do not imply an immediate action in response to the occurrence of an action or during the occurrence of an action, but only imply that an action will occur when the condition is met, and no specific or immediate time constraints are required for the action to occur. The wording "exemplary" is used herein to mean "used as an example, instance or explanation". Any aspect described as "exemplary" herein need not be interpreted as being superior to or superior to other aspects. Unless specifically stated otherwise, the term "some" refers to one or more. Combinations such as "at least one of A, B, or C", "one or more of A, B, or C", "at least one of A, B and C", "one or more of A, B, and C", and "A, B, C, or any combination thereof" include any combination of A, B, and / or C, and may include multiple A, multiple B, or multiple C. Specifically, combinations such as "at least one of A, B, or C", "one or more of A, B, or C", "at least one of A, B, and C", "one or more of A, B, and C", and "A, B, C, or any combination thereof" may be only A, only B, only C, A and B, A and C, B and C, or A and B and C, wherein any such combination may include one or more members of A, B or C. The elements of the various aspects described throughout this disclosure are all structurally and functionally equivalent schemes currently or hereafter known to those of ordinary skill in the art are expressly incorporated by reference and are intended to be covered by the claims. In addition, nothing disclosed herein is intended to be donated to the public, regardless of whether such disclosure is explicitly recorded in the claims. The terms "module", "mechanism", "element", "equipment", etc. may not be a replacement for the term "device". Thus, no claim element should be interpreted as a device plus function unless the element is explicitly stated using the phrase "device for..."

Claims

1. An apparatus for wireless communication at a user equipment (UE), comprising: means for receiving a full duplex (FD) downlink channel from a base station, the FD downlink channel being duplexed with a second FD channel, wherein the second FD channel has a carrier frequency between a carrier frequency of a first portion of the FD downlink channel and a carrier frequency of a second portion of the FD downlink channel; means for receiving a channel state information reference signal (CSI-RS) from the base station on resources having first symbols of the first portion of the FD downlink channel and resources having the first symbols of the second portion of the FD downlink channel; as well as means for transmitting, to the base station, a channel state information (CSI) report based on the CSI-RS received on the first portion and the second portion.

2. An apparatus for wireless communication at a user equipment (UE), comprising: means for receiving a full duplex (FD) downlink channel from a base station, the FD downlink channel being duplexed with a second FD channel, wherein the second FD channel has a carrier frequency between a carrier frequency of a first portion of the FD downlink channel and a carrier frequency of a second portion of the FD downlink channel; as well as means for receiving a channel state information reference signal (CSI-RS) from the base station on resources having first symbols of the first portion of the FD downlink channel and resources having the first symbols of the second portion of the FD downlink channel, wherein The UE is configured with a first CSI reference resource, the first CSI reference resource comprising resources of the first part of the FD downlink channel and resources of the second part of the FD downlink channel, The first CSI reference resource does not include resources of the second FD channel, and The UE is configured with second CSI reference resources, which include resources of the first part of the FD downlink channel, resources of the second part of the FD downlink channel, and resources of the second FD channel.

3. A device for wireless communication at a base station, comprising: means for transmitting a full duplex (FD) downlink channel to a user equipment (UE), the FD downlink channel being duplexed with a second FD channel, wherein the second FD channel has a carrier frequency between a carrier frequency of a first portion of the FD downlink channel and a carrier frequency of a second portion of the FD downlink channel; means for transmitting a channel state information reference signal (CSI-RS) to the UE on resources having first symbols of the first portion of the FD downlink channel and resources having the first symbols of the second portion of the FD downlink channel; as well as means for receiving, from the UE, a channel state information (CSI) report based on the CSI-RS transmitted on the first portion and the second portion.

4. A device for wireless communication at a base station, comprising: means for transmitting a full duplex (FD) downlink channel to a user equipment (UE), the FD downlink channel being duplexed with a second FD channel, wherein the second FD channel has a carrier frequency between a carrier frequency of a first portion of the FD downlink channel and a carrier frequency of a second portion of the FD downlink channel; as well as means for transmitting a channel state information reference signal (CSI-RS) to the UE on resources having first symbols of the first portion of the FD downlink channel and resources having the first symbols of the second portion of the FD downlink channel, wherein The UE is configured with a first CSI reference resource, the first CSI reference resource comprising resources of the first part of the FD downlink channel and resources of the second part of the FD downlink channel, The first CSI reference resource does not include resources of the second FD channel, and The UE is configured with second CSI reference resources, which include resources of the first part of the FD downlink channel, resources of the second part of the FD downlink channel, and resources of the second FD channel.

Images