Method, device and base station for channel state information reporting for multiple transmission reception point operation

Abstract

The present disclosure relates to techniques for performing channel state information reporting for multiple transmission reception points operating in a wireless communication system. Channel state information configuration information may be provided to a wireless device. The channel state information configuration information may indicate channel measurement resources associated with each of a plurality of transmission reception points. The wireless device may perform channel state information reporting based on the channel state information configuration information.

Description

Technical Field

[0001] The present application relates to wireless communications, and more particularly, to systems, apparatuses, and methods for performing channel state information reporting for multiple transmission reception point operations in a wireless communication system. Background Art

[0002] The use of wireless communication systems is growing rapidly. In recent years, wireless devices such as smartphones and tablets have become increasingly sophisticated. In addition to supporting phone calls, many mobile devices (i.e., user equipment devices or UEs) now also provide access to the Internet, email, text messaging and navigation using the Global Positioning System (GPS), and are capable of operating sophisticated applications that utilize these capabilities. In addition, there are many different wireless communication technologies and wireless communication standards. Some examples of wireless communication standards include GSM, UMTS (e.g., associated with WCDMA or TD-SCDMA air interfaces), LTE, Advanced LTE (LTE-A), NR, HSPA, 3GPP2 CDMA2000 (e.g., 1xRTT, 1xEV-DO, HRPD, eHRPD), IEEE 802.11 (WLAN or Wi-Fi), BLUETOOTH TM wait.

[0003] The introduction of an ever-increasing number of features and functions in wireless communication devices also requires continuous improvements in wireless communication and improvements in wireless communication devices. Of particular importance is ensuring the accuracy of signals transmitted and received by user equipment (UE) devices (e.g., by wireless devices such as cellular phones, base stations, and relay stations used in wireless cellular communications). Furthermore, increasing the functionality of UE devices can place a significant strain on the battery life of the UE devices. Therefore, it is also very important to reduce the power requirements in UE device designs while allowing the UE devices to maintain good transmit and receive capabilities to improve communications. Therefore, improvements are desired in this area. Summary of the Invention

[0004] Embodiments of an apparatus, system, and method for performing channel state information reporting for multiple transmission reception point operations in a wireless communication system are presented herein.

[0005] According to the techniques described herein, channel state information configuration information can be provided to a wireless device configured with channel measurement resources associated with different transmission reception points. The channel measurement resources can be indicated in a manner that enables the wireless device to determine that different channel measurement resources are associated with different transmission reception points; for example, different sets of channel measurement resources can be indicated, where each set of channel measurement resources is associated with a different transmission reception point.

[0006] The channel state information configuration information may also configure one or more pairs of channel measurement resources such that each channel measurement resource in such a pair is associated with a different transmission reception point. This may, at least in some cases, help support efficient multi-transmission reception point channel measurement and reporting for potential multi-transmission reception point operation of a wireless device.

[0007] Additionally, several possible techniques for configuring interference measurement resources and / or for mapping channel measurement resources to interference measurement resources are described herein, including for scenarios where one or more pairs of channel measurement resources are configured. Such techniques may, at least in some cases, help support the ability of a wireless device to perform multi-transmission reception point interference measurements and reporting for potential multi-transmission reception point operations of the wireless device.

[0008] Note that the techniques described herein may be implemented and / or used with a number of different types of devices, including but not limited to base stations, access points, mobile phones, portable media players, tablet computers, wearable devices, unmanned aerial vehicles, unmanned flight controllers, automobiles and / or motor vehicles, and various other computing devices.

[0009] This summary is intended to provide a brief overview of some of the subject matter described in this document. Therefore, it should be understood that the above-described features are merely examples and should not be construed as narrowing the scope or spirit of the subject matter described herein in any way. Other features, aspects, and advantages of the subject matter described herein will become apparent from the following detailed description, accompanying drawings, and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] A better understanding of the present subject matter may be obtained when the following detailed description of various embodiments is considered in conjunction with the following drawings, in which:

[0011] Figure 1 An exemplary (and simplified) wireless communication system according to some embodiments is shown;

[0012] Figure 2 illustrates an exemplary base station in communication with an exemplary wireless user equipment (UE) device in accordance with some embodiments;

[0013] Figure 3 is an exemplary block diagram of a UE according to some embodiments;

[0014] Figure 4 is an exemplary block diagram of a base station according to some embodiments;

[0015] Figure 5is a flow chart illustrating aspects of an exemplary possible method for performing channel state information reporting for multiple transmission reception point operation in a wireless communication system according to some embodiments;

[0016] Figure 6 illustrates exemplary possible aspects of channel measurement resource configuration according to some embodiments; and

[0017] Figures 7 to 9 Exemplary aspects of various possible methods for channel state information interference measurement resource configuration in a multiple transmission reception point wireless communication system according to some embodiments are shown.

[0018] While the features described herein are susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and are herein described in detail. It should be understood, however, that the drawings and detailed description thereof are not intended to limit this disclosure to the specific forms disclosed, but on the contrary, are intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the subject matter as defined by the appended claims. DETAILED DESCRIPTION

[0019] Acronyms

[0020] Various acronyms are used throughout this disclosure. The definitions of the most prominent acronyms used that may appear throughout this disclosure are as follows:

[0021] UE: User Equipment

[0022] RF: Radio Frequency

[0023] BS: Base Station

[0024] GSM: Global System for Mobile Communications

[0025] UMTS: Universal Mobile Telecommunications System

[0026] LTE: Long Term Evolution

[0027] NR: New Radio

[0028] TX: Transmit / Transmit

[0029] RX: Receive / Receive

[0030] RAT: Radio Access Technology

[0031] TRP: Transmission Reception Point

[0032] DCI: Downlink Control Information

[0033] CORESET: Control resource set

[0034] QCL: Quasi-co-location or quasi-co-location

[0035] CSI: Channel State Information

[0036] CSI-RS: Channel State Information Reference Signal

[0037] CSI-IM: Channel State Information Interference Measurement

[0038] CMR: Channel Measurement Resource

[0039] IMR: Interference Measurement Resource

[0040] ZP: Zero Power

[0041] NZP: Non-Zero Power

[0042] CQI: Channel Quality Indicator

[0043] PMI: Precoding Matrix Indicator

[0044] RI: Rank Indicator

[0045] the term

[0046] The following is a glossary of terms that will appear in this disclosure:

[0047] Memory medium - any of various types of non-transitory memory devices or storage devices. The term "memory medium" is intended to include installation media, such as CD-ROMs, floppy disks, or tape devices; computer system memory or random access memory such as DRAM, DDR RAM, SRAM, EDO RAM, Rambus RAM, etc.; non-volatile memory such as flash memory, magnetic media, for example, hard drives or optical storage devices; registers or other similar types of memory elements, etc. The memory medium may also include other types of non-transitory memory or a combination thereof. In addition, the memory medium may be located in the first computer system that executes the program, or may be located in a different second computer system that is connected to the first computer system via a network such as the Internet. In the latter example, the second computer system may provide program instructions to the first computer system for execution. The term "memory medium" may include two or more memory media that may reside in different locations in different computer systems connected, for example, via a network. The memory medium may store program instructions (e.g., expressed as a computer program) that may be executed by one or more processors.

[0048] Carrier Medium—storage media as described above, and physical transmission media such as a bus, network, and / or other physical transmission media that transport signals such as electrical, electromagnetic, or digital signals.

[0049] Computer system (or computer) - any of various types of computing or processing systems, including a personal computer system (PC), a mainframe computer system, a workstation, a network appliance, an Internet appliance, a personal digital assistant (PDA), a television system, a grid computing system, or other devices or combinations of devices. In general, the term "computer system" can be broadly defined as any device (or combination of devices) that includes at least one processor that executes instructions from a memory medium.

[0050] User Equipment (UE) (or "UE device") - any of various types of computer systems or devices that are mobile or portable and that perform wireless communication. Examples of UE devices include mobile phones or smartphones (e.g., iPhones, TN , based on Android TM phones), tablets (e.g., iPad TM 、Samsung Galaxy TM ), portable gaming devices (e.g., Nintendo DS TM PlayStation Portable TM 、Gameboy Advance TM , iPhone TM ), wearable devices (e.g., smart watches, smart glasses), laptops, PDAs, portable Internet devices, music players, data storage devices, other handheld devices, cars and / or motor vehicles, unmanned aerial vehicles (UAVs) (e.g., drones), UAV controllers (UACs), etc. In general, the term "UE" or "UE device" can be broadly defined to cover any electronic device, computing device, and / or telecommunication device (or combination of these devices) that is easily transportable by a user and capable of wireless communication.

[0051] Wireless Device—Any of various types of computer systems or devices that perform wireless communications. A wireless device may be portable (or mobile), or may be stationary or fixed in place. A UE is an example of a wireless device.

[0052] Communication Device—Any of various types of computer systems or devices that perform communication, either wired or wireless. A communication device may be portable (or mobile), or stationary or fixed in place. A wireless device is one example of a communication device. A UE is another example of a communication device.

[0053] Base Station (BS) - The term "base station" has the full breadth of its ordinary meaning and includes at least a wireless communication station installed at a fixed location and used to communicate as part of a wireless telephone system or radio system.

[0054] Processing element (or processor) – refers to any element or combination of elements capable of performing functions in a device, such as a user equipment device or a cellular network device. A processing element may include, for example, a processor and associated memory, portions or circuits of individual processor cores, entire processor cores, processor arrays, circuits such as ASICs (application-specific integrated circuits), programmable hardware elements such as field-programmable gate arrays (FPGAs), and any combination thereof.

[0055] Wi-Fi - The term "Wi-Fi" has the full scope of its ordinary meaning and includes at least wireless communication networks, or RATs, that are served by wireless LAN (WLAN) access points and provide connectivity to the Internet through these access points. Most modern Wi-Fi networks (or WLAN networks) are based on the IEEE 802.11 standard and are marketed under the name "Wi-Fi." Wi-Fi (WLAN) networks are distinct from cellular networks.

[0056] Automatic—refers to an action or operation performed by a computer system (e.g., software executed by the computer system) or a device (e.g., a circuit, a programmable hardware element, an ASIC, etc.) without requiring user input to directly specify or execute the action or operation. Thus, the term "automatic" is in contrast to manual execution or specification of an action by a user, where the user provides input to directly execute the action. An automatic process may be initiated by input provided by a user, but the subsequent actions performed "automatically" are not specified by the user, i.e., they are not performed "manually," where the user specifies each action to be performed. For example, a user filling out an electronic form by selecting each field and providing input specifying information (e.g., by typing information, selecting checkboxes, radio selections, etc.) is manually filling out the form, even though the computer system must update the form in response to the user's actions. The form may be automatically filled out by a computer system, where the computer system (e.g., software executed on the computer system) analyzes the fields of the form and fills it out without requiring any user input to specify the answers to the fields. As indicated above, a user may invoke automatic filling of a form without participating in the actual filling out of the form (e.g., the user does not manually specify the answers to the fields, but rather they are automatically completed). This specification provides various examples of operations that are automatically performed in response to actions that a user has taken.

[0057] Configured to—Various components may be described as being “configured to” perform one or more tasks. In such contexts, “configured to” is a broad statement that generally means “having the structure” to perform one or more tasks during operation. Thus, a component can be configured to perform a task even when the component is not currently performing the task (e.g., a set of electrical conductors can be configured to electrically connect a module to another module even when the two modules are not connected). In some contexts, “configured to” can be a broad statement that generally means “having the circuitry” to perform one or more tasks during operation. Thus, a component can be configured to perform a task even when the component is not currently turned on. Generally, the circuitry that forms the structure corresponding to “configured to” may include hardware circuitry.

[0058] For ease of description, various components may be described as performing one or more tasks. Such descriptions should be interpreted as including the phrase "configured to." Representing a component as being configured to perform one or more tasks expressly does not invoke the sixth paragraph of section 112 of title 35 of the United States Code for that component.

[0059] Figure 1 and Figure 2 -Exemplary Communication System

[0060] Figure 1 An exemplary (and simplified) wireless communication system is shown in which various aspects of the present disclosure may be implemented according to some embodiments. Figure 1 The system is only one example of a possible system, and the embodiment may be implemented in any of a variety of systems as desired.

[0061] As shown, the exemplary wireless communication system includes a base station 102 that communicates with one or more (e.g., any number) user devices 106A, 106B, and so on through 106N via a transmission medium. Each user device may be referred to herein as a "user equipment" (UE) or a UE device. Accordingly, user device 106 is referred to as a UE or a UE device.

[0062] Base station 102 may be a base transceiver station (BTS) or a cell site and may include hardware and / or software that enables wireless communications with UEs 106A to 106N. If base station 102 is implemented in the context of LTE, it may be referred to as an "eNodeB" or "eNB." If base station 102 is implemented in the context of 5G NR, it may alternatively be referred to as a "gNodeB" or "gNB." Base station 102 may also be equipped to communicate with network 100 (e.g., a core network of a cellular service provider, a telecommunications network such as the Public Switched Telephone Network (PSTN), and / or the Internet, among various other possible networks). Thus, base station 102 may facilitate communications between user devices and / or between user devices and network 100. The communication area (or coverage area) of a base station may be referred to as a "cell." Also as used herein, with respect to a UE, a base station may sometimes be considered to represent the network, taking into account the UE's uplink and downlink communications. Thus, a UE communicating with one or more base stations in a network may also be understood as a UE communicating with the network.

[0063] The base station 102 and the user equipment may be configured to communicate over a transmission medium using any of a variety of radio access technologies (RATs), also known as wireless communication technologies or telecommunication standards, such as GSM, UMTS (WCDMA), LTE, Advanced LTE (LTE-A), LAA / LTE-U, 5G NR, 3GPP2, CDMA2000 (e.g., 1xRTT, 1xEV-DO, HRPD, eHRPD), Wi-Fi, and the like.

[0064] Base station 102 and other similar base stations operating according to the same or different cellular communication standards may thus be provided as one or more cell networks that may provide continuous or nearly continuous overlapping service to UE 106 and similar devices over a geographic area via one or more cellular communication standards.

[0065] Note that the UE 106 is capable of communicating using multiple wireless communication standards. For example, the UE 106 may be configured to communicate using either or both of the 3GPP cellular communication standard or the 3GPP2 cellular communication standard. In some embodiments, the UE 106 may be configured to perform techniques for performing channel state information reporting for multiple transmission reception point operations in a wireless communication system, such as according to the various methods described herein. The UE 106 may also or alternatively be configured to use WLAN, BLUETOOTH, or other similar communication methods. TM, one or more global navigation satellite systems (GNSS, such as GPS or GLONASS), one and / or more mobile television broadcast standards (e.g., ATSC-M / H), etc. Other combinations of wireless communication standards (including more than two wireless communication standards) are also possible.

[0066] Figure 2 An exemplary user equipment 106 (e.g., one of devices 106A to 106N) in communication with a base station 102 according to some embodiments is shown. UE 106 can be a device with wireless network connectivity, such as a mobile phone, a handheld device, a wearable device, a computer or tablet, an unmanned aerial vehicle (UAV), an unmanned flight controller (UAC), a car, or virtually any type of wireless device. UE 106 may include a processor (processing element) configured to execute program instructions stored in a memory. UE 106 can execute any of the method embodiments described herein by executing such stored instructions. Alternatively or in addition, UE 106 may include a programmable hardware element, such as an FPGA (field programmable gate array), an integrated circuit, and / or any of various other possible hardware components configured to execute (e.g., individually or in combination) any one of the method embodiments described herein or any part of any one of the method embodiments described herein. UE 106 can be configured to communicate using any one of a plurality of wireless communication protocols. For example, UE 106 may be configured to communicate using two or more of CDMA2000, LTE, LTE-A, 5G NR, WLAN, or GNSS. Other combinations of wireless communication standards are also possible.

[0067] UE 106 may include one or more antennas for communicating using one or more wireless communication protocols according to one or more RAT standards. In some embodiments, UE 106 may share one or more portions of a receive chain and / or transmit chain between multiple wireless communication standards. The shared radio components may include a single antenna, or may include multiple antennas for performing wireless communication (e.g., for MIMO). Typically, the radio components may include any combination of a baseband processor, analog radio frequency (RF) signal processing circuits (e.g., including filters, mixers, oscillators, amplifiers, etc.), or digital processing circuits (e.g., for digital modulation and other digital processing). Similarly, the radio components may implement one or more receive chains and transmit chains using the aforementioned hardware.

[0068] In some embodiments, the UE 106 may include a separate transmit chain and / or receive chain (e.g., including separate antennas and other radio components) for each wireless communication protocol with which it is configured to communicate. As another possibility, the UE 106 may include one or more radio components shared between multiple wireless communication protocols, and one or more radio components used uniquely by a single wireless communication protocol. For example, the UE 106 may include shared radio components for communicating using either LTE or CDMA2000 1xRTT (or LTE or GSM), and shared radio components for communicating using Wi-Fi and BLUETOOTH. TM Each of the radio components communicates independently. Other configurations are also possible.

[0069] Figure 3 - Block diagram of an exemplary UE device

[0070] Figure 3 A block diagram of an exemplary UE 106 according to some embodiments is shown. As shown, the UE 106 may include a system on a chip (SOC) 300, which may include components for various purposes. For example, as shown, the SOC 300 may include a processor 302 that can execute program instructions for the UE 106, and a display circuit 304 that can perform graphics processing and provide display signals to a display 360. The SOC 300 may also include sensor circuitry 370, which may include components for sensing or measuring any of various possible characteristics or parameters of the UE 106. For example, the sensor circuitry 370 may include motion sensing circuitry configured to detect the motion of the UE 106, for example, using a gyroscope, an accelerometer, and / or any of various other motion sensing components. As another possibility, the sensor circuitry 370 may include one or more temperature sensing components, for example, for measuring the temperature of each of one or more antenna panels and / or other components of the UE 106. Any of various other possible types of sensor circuitry may also or alternatively be included in the UE 106, as desired. Processor 302 may also be coupled to a memory management unit (MMU) 340, which may be configured to receive addresses from processor 302 and translate those addresses into locations in memory (e.g., memory 306, read-only memory (ROM) 350, NAND flash memory 310) and / or other circuits or devices, such as display circuitry 304, radio 330, connector I / F 320, and / or display 360. MMU 340 may be configured to perform memory protection and page table translation or setup. In some embodiments, MMU 340 may be included as part of processor 302.

[0071] As shown, the SOC 300 may be coupled to various other circuits of the UE 106. For example, the UE 106 may include various types of memory (e.g., including NAND flash memory 310), a connector interface 320 (e.g., for coupling to a computer system, a docking station, a charging station, etc.), a display 360, and wireless communication circuitry 330 (e.g., for LTE, LTE-A, NR, CDMA2000, BLUETOOTH, etc.). TM , Wi-Fi, GPS, etc.). The UE device 106 may include at least one antenna (e.g., 335a), and may include multiple antennas (e.g., as shown by antennas 335a and 335b), for performing wireless communications with base stations and / or other devices. Antennas 335a and 335b are shown by way of example, and the UE device 106 may include fewer or more antennas. In general, the one or more antennas are collectively referred to as antennas 335. For example, the UE device 106 may use antennas 335 with the aid of radio circuitry 330 to perform wireless communications. As described above, in some embodiments, the UE may be configured to perform wireless communications using multiple wireless communication standards.

[0072] The UE 106 may include hardware and software components for implementing the methods of the UE 106 to perform techniques for performing channel state information reporting for multiple transmission reception point operations in a wireless communication system, such as those described further herein. The processor 302 of the UE device 106 may be configured to implement a portion or all of the methods described herein, for example, by executing program instructions stored on a memory medium (e.g., a non-transitory computer-readable memory medium). In other embodiments, the processor 302 may be configured as a programmable hardware element, such as an FPGA (field programmable gate array) or as an ASIC (application-specific integrated circuit). In addition, as Figure 3 As shown, processor 302 may be coupled to and / or interoperable with other components to perform techniques for performing channel state information reporting for multiple transmission reception point operations in a wireless communication system in accordance with various embodiments disclosed herein. Processor 302 may also implement various other applications and / or end-user applications running on UE 106.

[0073] In some embodiments, radio 330 may include separate controllers dedicated to controlling communications for various corresponding RAT standards. Figure 3 As shown, the radio component 330 may include a Wi-Fi controller 352, a cellular controller (eg, an LTE and / or LTE-A controller) 354, and a BLUETOOTH controller. TMController 356, and in at least some embodiments, one or more or all of these controllers may be implemented as respective integrated circuits (ICs or chips) that communicate with each other and with SOC 300 (more specifically, with processor 302). For example, Wi-Fi controller 352 may communicate with cellular controller 354 via a cell-ISM link or WCI interface, and / or BLUETOOTH controller 354 may communicate with the cellular controller 354 via a cell-ISM link or WCI interface. TM The controller 356 may communicate with the cellular controller 354 via a cell-ISM link, etc. Although three separate controllers are shown within the radio 330, other embodiments may be implemented in the UE device 106 having fewer or more similar controllers for various different RATs.

[0074] Additionally, embodiments are contemplated in which the controller can implement functionality associated with multiple radio access technologies. For example, according to some embodiments, in addition to hardware and / or software components for performing cellular communications, the cellular controller 354 can also include hardware and / or software components for performing one or more activities associated with Wi-Fi, such as Wi-Fi preamble detection, and / or generation and transmission of Wi-Fi physical layer preamble signals.

[0075] Figure 4 - Block diagram of an exemplary base station

[0076] Figure 4 1 shows a block diagram of an exemplary base station 102 according to some embodiments. Note that Figure 4 The base station 102 is only one example of a possible base station. As shown, the base station 102 may include a processor 404 that may execute program instructions for the base station 102. The processor 404 may also be coupled to a memory management unit (MMU) 440 or other circuit or device that may be configured to receive addresses from the processor 404 and translate those addresses into locations in memory (e.g., memory 460 and read-only memory (ROM) 450).

[0077] The base station 102 may include at least one network port 470. The network port 470 may be configured to couple to a telephone network and provide access to the telephone network as described above. Figure 1 and Figure 2The network port 470 may be configured to couple to a plurality of devices such as the UE device 106 to the telephone network described in the embodiment of the present invention. The network port 470 (or an additional network port) may also or alternatively be configured to couple to a cellular network, such as a core network of a cellular service provider. The core network may provide mobility-related services and / or other services to a plurality of devices such as the UE device 106. In some cases, the network port 470 may be coupled to the telephone network via the core network, and / or the core network may provide the telephone network (e.g., in other UE devices served by the cellular service provider).

[0078] The base station 102 may include at least one antenna 434 and possibly multiple antennas. One or more antennas 434 may be configured to operate as a wireless transceiver and may be further configured to communicate with the UE device 106 via the radio component 430. The antenna 434 communicates with the radio component 430 via a communication chain 432. The communication chain 432 may be a receive chain, a transmit chain, or both. The radio component 430 may be designed to communicate via various wireless telecommunication standards, including but not limited to NR, LTE, LTE-A WCDMA, CDMA2000, etc. The processor 404 of the base station 102 may be configured to implement and / or support implementation of part or all of the methods described herein, for example, by executing program instructions stored on a memory medium (e.g., a non-transitory computer-readable memory medium). Alternatively, the processor 404 may be configured as a programmable hardware element such as an FPGA (field programmable gate array), or as an ASIC (application-specific integrated circuit), or a combination thereof. In the case of certain RATs (e.g., Wi-Fi), the base station 102 may be designed as an access point (AP), in which case the network port 470 may be implemented to provide access to a wide area network and / or one or more local area networks, for example, it may include at least one Ethernet port, and the radio component 430 may be designed to communicate according to the Wi-Fi standard.

[0079] Channel State Information

[0080] Wireless devices, such as user equipment, can be configured to measure the quality of a downlink channel and report information related to the quality measurement to a base station. For example, a UE can periodically send channel state information (CSI) to a base station. The base station can then receive and use this channel state information to determine adjustments to various parameters during communications with the wireless device. Specifically, the base station can use the received channel state information to adjust the coding of its downlink transmissions to improve downlink channel quality.

[0081] In most cellular systems, a base station transmits a pilot signal (or reference signal), such as a channel state information reference signal (CSI-RS), which is used to estimate the channel (or portion of the channel) between the base station and the UE. The UE receives the reference signal and calculates channel state information (CSI) based on the reference signal. The UE then reports the channel state information back to the base station. The base station can then generate downlink data based on the received CSI and transmit the downlink data to the UE. In other words, the base station can adjust the way the downlink data is encoded and generated based on the channel state information received from the UE.

[0082] For example, at least according to some embodiments, in the 3GPP NR cellular communication standard, the channel state information fed back from the UE may include one or more of a channel quality indicator (CQI), a precoding matrix indicator (PMI), a rank indicator (RI), a CSI-RS resource indicator (CRI), a SSBRI (SS / PBCH resource block indicator), and a layer indicator (LI).

[0083] Channel quality information can be provided to the base station for link adaptation, for example, to provide guidance on which modulation and coding scheme (MCS) the base station should use when transmitting data. For example, when the downlink channel communication quality between the base station and the UE is determined to be high, the UE can feedback a high CQI value, which can cause the base station to use a relatively high modulation order and / or a low channel coding rate to transmit data. For another example, when the downlink channel communication quality between the base station and the UE is determined to be low, the UE can feedback a low CQI value, which can cause the base station to use a relatively low modulation order and / or a high channel coding rate to transmit data.

[0084] PMI feedback may include preferred precoding matrix information and may be provided to the base station to indicate which MIMO precoding scheme the base station should use. In other words, the UE may measure the quality of the downlink MIMO channel between the base station and the UE based on the pilot signal received on the channel, and may recommend which MIMO precoding the base station is expected to apply through PMI feedback. In some cellular systems, the PMI configuration is represented in matrix form, which provides linear MIMO precoding. The base station and the UE may share a codebook consisting of multiple precoding matrices, where each MIMO precoding matrix in the codebook may have a unique index. Therefore, as part of the channel state information fed back by the UE, the PMI may include an index (or possibly multiple indices) corresponding to the most preferred MIMO precoding matrix (or multiple matrices) in the codebook. This may enable the UE to minimize the amount of feedback information. Therefore, at least according to some embodiments, the PMI may indicate which precoding matrix from the codebook should be used for transmission to the UE.

[0085] For example, when the base station and UE have multiple antennas, rank indicator information (RI feedback) can indicate the number of transmission layers that the UE determines can be supported by the channel, which can enable multi-layer transmission through spatial multiplexing. RI and PMI together allow the base station to know which precoding needs to be applied to which layer, for example, depending on the number of transmission layers.

[0086] In some cellular systems, the PMI codebook is defined based on the number of transmission layers. In other words, for R layer transmission, N N codebooks can be defined. t ×R matrix (e.g., where R represents the number of layers, N t denotes the number of transmitter antenna ports, and N denotes the codebook size). In such a scenario, the number of transmission layers (R) may conform to the rank value of the precoding matrix (N t ×R matrix), and thus R may be referred to as a "rank indicator (RI)" in this context.

[0087] Thus, the channel state information may include an assigned rank (e.g., a rank indicator or RI). For example, a MIMO-capable UE communicating with a BS may include four receiver chains, e.g., four antennas. The BS may also include four or more antennas to implement MIMO communication (e.g., 4×4 MIMO). Thus, the UE may be able to simultaneously receive up to four (or more) signals (e.g., layers) from the BS. Layer-to-antenna mapping may be applied, e.g., each layer may be mapped to any number of antenna ports (e.g., antennas). Each antenna port may transmit and / or receive information associated with one or more layers. The rank may include multiple bits and may indicate the number of signals that the BS may transmit to the UE in an upcoming time period (e.g., during an upcoming transmission time interval or TTI). For example, an indication of rank 4 may indicate that the BS will transmit four signals to the UE. As one possibility, the RI may be two bits in length (e.g., because two bits are sufficient to distinguish four different rank values). Note that other numbers and / or configurations of antennas (e.g., at either or both the UE or the BS) and / or other numbers of data layers are also possible according to various embodiments.

[0088] Figure 5 - Channel state information reporting for multiple transmission reception point operations

[0089] In accordance with some cellular communication technologies, a wireless device may communicate with multiple transmission reception points (TRPs), including potentially simultaneously. Such communications may be scheduled using downlink control information (DCI), which may be provided using control signaling, such as on a physical downlink control channel (PDCCH), which may be transmitted in one or more control resource sets (CORESETs). DCI may be provided in a single DCI mode, in which a single DCI communication (e.g., from only one TRP) may be used to schedule communications between multiple TRPs and the wireless device, or in a multiple DCI mode, in which each of the multiple TRPs may provide its own DCI communication scheduling communications with the wireless device.

[0090] Communications scheduled in such a multi-TRP scenario may include data communications (e.g., which may be transmitted using a physical downlink shared channel (PDSCH)) and / or aperiodic channel state information reference signal (CSI-RS) transmissions, among other possibilities. In addition, aperiodic CSI-RS transmissions may include CSI-RS configured for multiple possible purposes, such as for beam management, tracking, or CSI acquisition.

[0091] Currently, support for CSI reporting for multi-TRP operation is limited. Improvements in CSI reporting configuration and performance can correspondingly improve network and wireless device efficiency, for example, by providing support for explicit interference hypothesis testing for each of the multiple TRPs to support efficient switching between single-TRP and multi-TRP operation, and / or in any of a variety of other ways.

[0092] Therefore, it may be advantageous to specify techniques for efficient channel state information reporting to support multiple TRP scenarios. To illustrate a set of such possible techniques, Figure 5 is a flowchart illustrating a method for performing channel state information reporting for multi-TRP operations in a wireless communication system according to at least some embodiments.

[0093] Figure 5 Aspects of the methods of the present invention may be implemented by a wireless device, for example, in conjunction with one or more cellular base stations (such as the UE 106 and BS 102 shown and described with respect to the various figures herein), or more generally, as appropriate, in conjunction with any of the computer circuits, systems, devices, elements, or components shown in the above figures. For example, a processor (and / or other hardware) of such a device may be configured to cause the device to perform any combination of the illustrated method elements and / or other method elements.

[0094] It is noted that although the present invention is described in terms of using communication techniques and / or features associated with 3GPP and / or NR specification documents, Figure 5However, this description is not intended to limit the present disclosure and may be used in any suitable wireless communication system as needed. Figure 5 In various embodiments, some of the method elements shown may be performed simultaneously in an order different from that shown, may be replaced by other method elements, or may be omitted. Additional method elements may also be performed as needed. As shown, Figure 5 The method can be operated as follows.

[0095] In 502, the wireless device may establish a wireless link with a cellular base station. According to some embodiments, the wireless link may include a cellular link according to 5G NR. For example, the wireless device may establish a session with an AMF entity of the cellular network via one or more gNBs that provide radio access to the cellular network. As another possibility, the wireless link may include a cellular link according to LTE. For example, the wireless device may establish a session with a mobility management entity of the cellular network via an eNB that provides radio access to the cellular network. According to various embodiments, other types of cellular links are also possible, and the cellular network may also or alternatively operate according to another cellular communication technology (e.g., UMTS, CDMA2000, GSM, etc.).

[0096] Establishing the wireless link may include, at least according to some embodiments, establishing an RRC connection with a serving cellular base station. Establishing the first RRC connection may include configuring various parameters for communication between the wireless device and the cellular base station, establishing environmental information for the wireless device, and / or any of a variety of other possible features, for example, involving establishing an air interface of the wireless device for cellular communication with a cellular network associated with the cellular base station. After establishing the RRC connection, the wireless device may operate in an RRC connected state. In some instances, the RRC connection may also be released (e.g., after a certain period of inactivity relative to data communication), in which case the wireless device may operate in an RRC idle state or an RRC inactive state. In some cases, such as due to wireless device mobility, changes in wireless medium conditions, and / or any other variety of possible reasons, the wireless device may perform a handover (e.g., while in RRC connected mode) or a cell reselection (e.g., when in RRC idle mode or RRC inactive mode) to a new serving cell.

[0097] According to at least some embodiments, a wireless device may establish multiple wireless links, for example, with multiple TRPs of a cellular network, according to a multi-TRP configuration. In such a scenario, the wireless device may be configured (e.g., via RRC signaling) with one or more transmission control indicators (TCIs), which may correspond to various beams that may be used to communicate with the TRPs. In addition, there may be situations where one or more configured TCI states may be activated at a particular time by a medium access control (MAC) control element (CE) of the wireless device.

[0098] At least in some cases, establishing the wireless link may include the wireless device providing capability information of the wireless device.Such capability information may include information related to any of a plurality of types of wireless device capabilities.

[0099] In 504, the wireless device may receive CSI configuration information indicating channel measurement resources associated with each of the plurality of TRPs. According to various implementations, the CSI configuration information may be received from one cellular base station, or may be received from multiple cellular base stations (e.g., different portions may be provided from each base station, or redundant provision of the CSI configuration information may be provided from multiple base stations to increase robustness, among other possibilities). The CSI configuration information may include any or all of a variety of configuration information types and may be provided using an RRC message, a MAC CE, or a DCI, among other possibilities.

[0100] In some cases, the CSI configuration information may include information configuring possible CSI measurement resource sets, where the indicated different possible CSI measurement resource sets are associated with different TRPs. For example, a CSI resource configuration RRC message (e.g., such as a "CSI-ResourceConfig" RRC message) may include multiple non-zero power CSI-RS resource sets associated with different TRPs in an NZP-CSI-RS resource set list information element, or may include multiple NZP-CSI-RS resource set list information elements, each including an NZP-CSI-RS resource set associated with a different TRP, as well as various possibilities.

[0101] In some cases, the CSI configuration information may include information configuring resources for performing channel measurements to perform (e.g., periodic, semi-persistent, or aperiodic) CSI reporting. In some cases, such information may refer to one or more possible CSI measurement resource sets configured in a CSI resource configuration RRC message. For example, a CSI report configuration RRC message (e.g., such as a "CSI-ReportConfig" RRC message or a "CSI-AssociatedReportConfigInfo" RRC message) may configure resources for channel measurement associated with each of a plurality of TRPs by indicating those resources for channel measurement associated with one ("first") TRP in one ("first") resource of a channel measurement information element for the CSI report configuration RRC message, and indicating those resources for channel measurement associated with another ("second") TRP in another ("second") resource of a channel measurement information element for the CSI report configuration RRC message.

[0102] In accordance with some embodiments, the CSI configuration information may include information configuring one or more pairs of CSI-RS resources, wherein the CSI-RS resources included in the pair are associated with different TRPs, for example, to support multi-TRP channel measurements performing non-coherent joint transmission (NCJT). Thus, at least as a possibility, if different resource sets for channel measurement associated with different TRPs are configured, each configured CSI-RS resource pair may include one CSI-RS resource from one channel measurement resource set and one CSI-RS resource from another channel measurement resource set. Configuring a limited set of CSI-RS resource pairs for a wireless device to potentially perform multi-TRP channel measurements in this manner may help reduce the potential hypothesis testing space for such multi-TRP channel measurements, which may, at least in some cases, enable simpler wireless devices and / or networks.

[0103] Note that such a pair can be indicated by providing information identifying each CSI-RS resource of the pair (e.g., using an index value associated with the CSI-RS resource of each resource of the pair), or providing information indicating one of the CSI-RS resources (e.g., using an index value associated with the indicated CSI-RS resource, where the other CSI-RS resources have the same index value and are implicitly indicated), among other possibilities. The latter approach can reduce the amount of signaling information required to indicate a CSI-RS pair, at least according to some embodiments, but may also reduce configuration flexibility.

[0104] In some cases, the CSI configuration information may include information that explicitly configures interference measurement resources for performing interference measurement to perform CSI reporting. Additionally or alternatively, in some cases, the interference measurement resources for performing interference measurement may be restricted and mapped to the configured channel measurement resources in a preconfigured (e.g., specified) manner, and thus may be implicitly configured.

[0105] For example, as one possibility, it may be possible to configure one CSI-IM resource when multiple CSI-RS resource sets are configured for a single CSI report. In other words, the wireless device may use a single CSI-interference measurement (IM) resource to perform interference measurement for the CSI report. It may be possible that the CSI-IM resource is quasi-co-located (QCL) with the corresponding CSI-RS resource used for channel measurement. At least in some cases, such an approach may exploit the possibility that, for a zero-power interference measurement resource, a majority of the interference present may be inter-cell interference, such that all CSI-IM resources may be (e.g., approximately) equally applicable.

[0106] As another possibility, the number of zero-power interference measurement resources (e.g., CSI-IM) can be configured to be equal to the number of configured channel measurement resources (e.g., CSI-RS), for example, such that the number of CSI-IM resources is equal to the total number of CSI-RS resources configured in the CSI-RS resource set. In such a scenario, it is possible that CSI-IM resources can be mapped one-to-one to CMRs for single-TRP interference measurement for CSI reporting, and / or multi-TRP interference measurement for CSI reporting (e.g., for NCJT) can be performed using CSI-IM resource pairs associated with corresponding CSI-RS resource pairs indicated in the CSI configuration information.

[0107] As another possibility, the number of zero-power interference measurement resources can be configured to be equal to the number of configured channel measurement resources plus the number of CSI-RS resource pairs indicated in the CSI configuration information. In such a scenario, it is possible that CSI-IM resources can be mapped one-to-one to CMRs for single-TRP interference measurement for CSI reporting, and / or multi-TRP interference measurement for CSI reporting can be performed using CSI-IM resources associated with corresponding CSI-RS resource pairs indicated in the CSI configuration information.

[0108] As yet another possibility, the number of zero-power interference measurement resources may be configured to be equal to the number of CMRs in the largest of the CMR sets configured in the CSI configuration information. If desired, the CMR sets configured in the CSI configuration information may be of equal size, for example, to avoid introducing additional complexity. CMRs with the same relative position in different CMR sets may share the same CSI-IM. Therefore, it is possible that single-TRP interference measurement for CSI reporting may be performed using CSI-IM resources mapped to CSI-RS resources associated with the corresponding TRP. At least as one possibility, for multi-TRP interference measurement for CSI reporting, it is possible that CSI-IM resources associated with CSI-RS resources in the larger of the first CSI-RS resource set or the second CSI-RS resource set are used for each pair of CSI-RS resources indicated in the CSI configuration information.

[0109] Note that, at least according to some embodiments, it may be the case that when multi-TRP CSI reporting is configured (e.g., when multiple CMR sets are configured in the same CSI reporting configuration RRC message), non-zero power (NZP) interference measurement resources (IMRs) are not configured. Such NZP-IMRs can typically be used to assess intra-cell interference, such as from multi-user multiple input multiple output (MU-MIMO) operations with other wireless devices in the same cell. Alternatively, it may be the case that one NZP-IMR set can be configured in such scenarios. It may be the case that interference measured on such configured NZP-IMR resources is considered to apply to all single-TRP and multi-TRP CMR measurements. For spatial filtering (e.g., quasi co-location (QCL) assumptions such as QCL-TypeD and other QCL properties for NZP-IMR measurements), NZP IMR may follow the QCL information provided for CMR (e.g., qcl-InfoPeriodicCSI-RS configured in the NZP-CSI-RS Resource IE as one possibility), or may be determined by the wireless device in any of a variety of other possible ways (e.g., where different beams may be used for CMR and IMR).

[0110] In 506, the wireless device may perform CSI reporting based at least in part on the CSI configuration information. This may include performing channel measurement using configured channel measurement resources (e.g., CSI-RS configured for channel measurement) by performing single-TRP or multi-TRP channel measurement, and / or performing interference measurement using configured interference measurement resources (e.g., one or more CSI-IMs and / or one or more configured NZP-IMRs mapped to the CSI-RS configured for channel measurement), and sending CSI reporting information to the network (e.g., to one or more serving cellular base stations) based at least in part on the performed measurements.

[0111] The CSI report information received by the network may be used to schedule and perform wireless communications with the wireless device, which may include determining whether to schedule multi-TRP operation or single TRP operation for the wireless device and / or determining which beam(s) to use to communicate with the wireless device, among other possibilities.

[0112] Thus, at least according to some embodiments, Figure 5 The method can be used to provide a framework according to which a wireless device can be configured to perform channel state information measurements and reporting for multiple TRPs, and thereby help a cellular network to effectively and efficiently schedule and perform wireless communications with the wireless device in at least some cases.

[0113] Figures 6 to 9 and additional information

[0114] Figures 6 to 9 Shown can be combined if necessary Figure 5 However, it should be noted that in Figures 6 to 9 The exemplary details shown in and described with respect to these figures are not intended to limit the disclosure as a whole: many variations and alternatives to the details provided below are possible and are to be considered within the scope of the disclosure.

[0115] In 3GPP Release 16, several different schemes are designed for multi-TRP operation, including schemes for multi-TRP operation based on multiple DCI and multi-TRP operation based on single DCI. According to various implementations, the multi-TRP operation scheme based on single DCI may also include a single transport block (TB) spatial division multiplexing (SDM) scheme, a single TB frequency division multiplexing (FDM) scheme, a dual TB FDM scheme, a time domain multiplexing (TDM) scheme with intra-slot repetition, and / or a TDM scheme with inter-slot repetition. However, 3GPP Release 16 does not include channel state information reference signal (CSI-RS) processing enhancements; for example, 3GPP Release 16 does not support explicit interference hypothesis testing for improved precoder selection for each TRP, and does not support efficient switching between single TRP operation and multi-TRP operation.

[0116] According to at least some embodiments, CSI reporting may involve reference signal configuration, channel interference measurement, and the configured number of reports (e.g., CQI, PMI, etc.). The reference signal configuration may include channel measurement resources (CMRs) and interference management resources (IMRs) for CSI reporting. IMRs may include non-zero power (NZP) IMRs (e.g., NZP-CSI-RS) and / or zero power (ZP) IMRs (e.g., CSI-IM).

[0117] Various aspects of CSI reporting for multi-TRP operation may be enhanced, potentially including aspects related to CMR configuration, CSI-IM configuration, and / or NZP-IMR configuration, for example, as will be further described herein.

[0118] Currently, a typical CSI measurement configuration in NR may include only one NZP-CSI-RS-ResourceSet for each channel measurement resource of the CSI-ReportConfig RRC message. Figure 6 As shown, the CSI-ReportConfig RRC message (602) may include a reference resource set (NZP-CSI-RS-ResourceSet) configuration (604), including resourcesForChannelMeasurement (CMR), csi-IM-ResourcesForInterference (ZP-IMR), and nzp-CSI-RS-ResourcesForInterference (NZP-IMR) IEs. Multiple NZP-CSI-RS-Resources (606) may be configured in each NZP-CSI-RS-ResourceSet.

[0119] To improve support for CSI reporting for multi-TRP operation, it may be advantageous to support the configuration of multiple CMR sets, for example, so that different channel measurement resource sets can be configured for different TRPs.

[0120] For example, as one possibility, an additional resourcesForChannelMeasurement IE may be included in the CSI-ReportConfig RRC message. Such a new IE may be referred to as "resourcesForChannelMeasurement2-r17," among various other possibilities. At least in some cases, the initial resourcesForChannelMeasurement IE in the CSI-ReportConfig RRC message may be defined as corresponding to one ("first") TRP, while the newly added resourcesForChannelMeasurement2-r17 IE in the same CSI-ReportConfig RRC message may be defined as corresponding to a different ("second") TRP.

[0121] As another possibility, in the aperiodic CSI reporting configuration, one or more additional resourcesForChannel IEs may be configured in the CSI-AssociatedReportConfigInfo RRC message. For example, a new "resourcesForChannel2-r17" (or otherwise named) IE may be added to the CSI-AssociatedReportConfigInfo in the following manner:

[0122]

[0123]

[0124] At least in some cases, the initial resourcesForChannel IE in the CSI-AssociatedReportConfigInfo RRC message may be defined to correspond to one ("first") TRP, while the newly added resourcesForChannel2-r17 IE in the same CSI-ReportConfigRRC message may be defined to correspond to a different ("second") TRP.

[0125] As yet another possibility, there may be multiple options in the CSI-ResourceConfig RRC message for configuring multiple channel measurement resources for multiple TRPs. As an option, up to two NZP-CSI-RS-ResourceSets may be configured in the nzp-CSI-RS-ResourceSetList IE. In such a scenario, it may be the case that the first NZP-CSI-RS-ResourceSet corresponds to one ("first") TRP, while the second NZP-CSI-RS-ResourceSet corresponds to a different ("second") TRP. As another option, it may be supported to add an additional csi_RS-ResourceSetList IE to the CSI-ResourceConfig RRC message, for example, in the following manner:

[0126]

[0127] In such a scenario, it may be the case that the initial csi-RS-ResourceSetList corresponds to one (“first”) TRP, while the new csi-RS-ResourceSetList2-r17 corresponds to a different (“second”) TRP.

[0128] In some cases, it may be that in the CSI-ReportConfig, two CSI-RS sets are configured, one for each TRP. The first set may be denoted as A and may include N1 CSI-RS resources. The second set may be denoted as B and may include N2 CSI-RS resources. It is possible that the network may configure multiple pairs of CSI-RS for the UE to measure nTRP non-coherent joint transmission (NCJT). For each pair, one CSI-RS may be selected from A and one CSI-RS may be selected from B. In order to indicate multiple such pairs, there may be several possible options. As one possibility, K1+K2 bits may be used for each pair. K1 bits may be used to indicate the CSI-RS in the first set (A), and K2 bits may be used to indicate the CSI-RS in the second set (B). As one possibility, by definition, K1 = K2 = the maximum size of the NZP-CSI-RS-ResourceSet can be specified, such that, for periodic or semi-persistent CSI reporting, K1 = K2 = 8 can be specified, and for aperiodic CSI reporting, K1 = K2 = 2 can be specified. Note that these example values are provided by way of example, and other values are possible. As another possibility, K1 and K2 can depend on the configured sizes of Set A and Set B, such that:

[0129]

[0130] As another possibility, a bitmap can be used, where the bitmap size is the same as the size of set A. In such scenarios, at least in some cases, it may be required that sets A and B have the same size (i.e., N1=N2). It is possible that in such scenarios, only CSI-RS with the same index in each set can be paired. Such an approach can reduce the number of bits required for signaling, but at least in some cases, it may also reduce resource scheduling flexibility.

[0131] In a scenario where two CSI-RS sets are configured for CMR, where set A includes N1 CSI-RS resources for a first TRP and set B includes N2 CSI-RS resources for a second TRP, and K pairs of CSI-RS resources are configured for NCJT measurement, where each pair includes one CSI-RS resource selected from set A and one CSI-RS resource selected from set B, there may be several options for configuring or specifying CSI-IM mapping and / or restrictions.

[0132] For example, as one possibility, when multiple CSI-RS resource sets are configured for a single CSI report, it may be possible to configure only a single CSI-IM. In such a scenario, channel interference can be determined based on the single CSI-IM resource, and the QCL of the CSI-IM resource can follow the corresponding CMR measurement.

[0133] As another possibility, the number of CSI-IM resources can be specified to be equal to the total number of CMRs in both Set A and Set B (i.e., N1+N2). Thus, each CSI-IM resource can be mapped to one CSI-RS resource; for example, Figure 7 As shown, the CSI-RS resources in set A 702 can be mapped to CSI-IM indices 0 to 3, while the CSI-RS resources in set B 704 can be mapped to CSI-IM indices 4 to 7. For single-TRP measurements, the used CSI-IM resources can be mapped one-to-one to CMRs, for example, based on QCL assumptions and interference measurements. For multi-TRP NCJT measurements, in each pair, both CSI-IM resources associated with the corresponding CSI-RS resources in the pair can be considered for interference measurement.

[0134] As yet another possibility, the number of CSI-IM resources may be specified to be equal to the total number of CMRs in both Set A and Set B plus the configured number of pairs (i.e., N1+N2+K). Thus, each CSI-RS resource may be mapped to one CSI-IM resource; for example, Figure 8 As shown, the CSI-RS resources in set A 802 can be mapped to CSI-IM indices 0 to 3, while the CSI-RS resources in set B 804 can be mapped to CSI-IM indices 4 to 7. In addition, each configured CMR pair in NCJT 806 can be mapped to a CSI-IM (e.g., CSI-IM indices 8 to 10). For single-TRP measurements, a one-to-one mapping (based on QCL assumptions and interference measurements) of CSI-IM resources corresponding to CMRs can be used. For multi-TRP NCJT measurements, a separate CSI-IM mapped to each CMR pair can be used.

[0135] As another possibility, the number of CSI-IM resources may be specified to be equal to the number of CMRs in the larger size set of CMR sets (i.e., max(N1, N2)). Figure 9As shown, in such a scenario, it is possible that each CSI-RS configured for CMR in set A 902 is mapped one-to-one to a CSI-IM, and each CSI-RS configured for CMR in set B 904 is also mapped to one of those same CSI-IMs. If necessary, the restriction of N1=N2 can be specified, for example, to reduce implementation complexity. Therefore, for single-TRP measurement, CSI-IM resources can be mapped one-to-one to CMRs following the set with the larger size. CSI-RS with the same relative index position in different CMR sets can share the same CSI-IM. For multi-TRPNCJT measurement, in each pair, the CSI-IM mapped to the CSI-RS in the set with the larger size can be used for QCL and interference measurement.

[0136] There may also be multiple configuration and / or specification options for NZP-IMR. As one possibility, for CSI reporting with multi-TRP operation, when two CMR sets are configured in the same CSI-ReportConfig indication, it may be specified that NZP-IMR cannot be configured.

[0137] As another possibility, for CSI reporting for multi-TRP operation, when two CMR sets are configured in the same CSI-ReportConfig indication, it can be specified that only one NZP-IMR resource set can be configured. The interference measured on the configured NZP-IMR resource can be applied to all single-TRP and multi-TRP CMR measurements. For spatial filtering (e.g., QCL-TypeD and other QCL properties for NZP-IMR measurements), it may be possible that it follows the qcl-InfoPeriodicCSI-RS configured in the NZP-CSI-RS-Resource IE, or it may be left to the UE implementation, as well as various possibilities.

[0138] In the following, additional exemplary embodiments are provided.

[0139] A set of embodiments may include an apparatus comprising: a processor configured to cause a wireless device to: receive channel state information (CSI) configuration information, wherein the CSI configuration information indicates channel measurement resources associated with each of a plurality of transmission reception points (TRPs); and perform CSI reporting based at least in part on the CSI configuration information.

[0140] According to some embodiments, the CSI configuration information includes information configuring possible CSI measurement resource sets, wherein at least a first possible CSI measurement resource set is associated with a first TRP, and wherein at least a second possible CSI measurement resource set is associated with a second TRP.

[0141] According to some embodiments, the first possible CSI measurement resource set includes a first non-zero power (NZP) CSI reference signal (RS) resource set indicated in an NZP-CSI-RS resource set list information element (IE) of a CSI resource configuration radio resource control (RRC) message, wherein the second possible CSI measurement resource set includes a second NZP CSI-RS resource set indicated in an NZP-CSI-RS resource set list IE of the CSI resource configuration RRC message.

[0142] According to some embodiments, a first possible CSI measurement resource set is indicated in a first non-zero power (NZP) CSI reference signal (RS) resource set list information element (IE) of a CSI resource configuration radio resource control (RRC) message, wherein a second possible CSI measurement resource set is indicated in a second NZP CSI-RS resource set list IE of the CSI resource configuration RRC message.

[0143] According to some embodiments, the CSI configuration information includes information configuring a first resource for channel measurement, the first resource being associated with a first TRP in a first resource of a channel measurement resource information element (IE) for a CSI report configuration radio resource control (RRC) message, wherein the CSI configuration information includes information configuring a second resource for channel measurement, the second resource being associated with a second TRP in a second resource of the channel measurement resource IE for the CSI report configuration RRC message.

[0144] According to some embodiments, the CSI configuration information indicates one or more pairs of CSI reference signal (RS) resources, where each pair of CSI-RS resources includes a CSI-RS resource associated with a first TRP and a CSI-RS resource associated with a second TRP.

[0145] According to some embodiments, the CSI configuration information configures a set of non-zero power (NZP) interference management resources (IMRs) for performing single TRP and multi-TRP channel interference measurements.

[0146] Another set of embodiments may include a method comprising: by a wireless device: receiving channel state information (CSI) configuration information, wherein the CSI configuration information indicates at least a first CSI reference signal (RS) resource set associated with a first transmission reception point (TRP) for channel measurement and a second CSI-RS resource set associated with a second TRP for channel measurement, wherein the CSI configuration information indicates CSI-RS resource pairs for channel measurement, wherein each pair of CSI-RS resources includes a CSI-RS resource associated with the first TRP and a CSI-RS resource associated with the second TRP; and performing CSI reporting based at least in part on the CSI configuration information.

[0147] According to some embodiments, the method further comprises performing interference measurement for CSI reporting using a single CSI-interference measurement (IM) resource, wherein the CSI-IM resource is quasi co-located (QCL) with a corresponding CSI-RS resource used for channel measurement.

[0148] According to some embodiments, the method further includes: determining that a plurality of CSI-interference measurement (IM) resources equal to the number of CSI-RS resources in the first CSI-RS resource set plus the number of CSI-RS resources in the second CSI-RS resource set have been mapped to the CSI-RS resources in the first CSI-RS resource set and the second CSI-RS resource set; and performing single TRP interference measurement for CSI reporting using the CSI-IM resources mapped one-to-one to the CSI-RS resources.

[0149] According to some embodiments, the method further includes: determining that a plurality of CSI-interference measurement (IM) resources equal to the number of CSI-RS resources in the first CSI-RS resource set plus the number of CSI-RS resources in the second CSI-RS resource set have been mapped to the CSI-RS resources in the first CSI-RS resource set and the second CSI-RS resource set; and performing multi-TRP interference measurements for CSI reporting using the CSI-IM resource pairs associated with the corresponding CSI-RS resource pairs indicated in the CSI configuration information.

[0150] According to some embodiments, the method further includes: determining that a plurality of CSI-interference measurement (IM) resources equal to the number of CSI-RS resources in the first CSI-RS resource set plus the number of CSI-RS resources in the second CSI-RS resource set plus the number of CSI-RS resource pairs indicated in the CSI configuration information have been mapped to the CSI-RS resources in the first CSI-RS resource set, the second CSI-RS resource set, and the CSI-RS resource pairs indicated in the CSI configuration information; and performing single TRP interference measurement for CSI reporting using the CSI-IM resources mapped one-to-one to the CSI-RS resources.

[0151] According to some embodiments, the method further includes: determining that a plurality of CSI-interference measurement (IM) resources equal to the number of CSI-RS resources in the first CSI-RS resource set plus the number of CSI-RS resources in the second CSI-RS resource set plus the number of CSI-RS resource pairs indicated in the CSI configuration information have been mapped to the CSI-RS resources in the first CSI-RS resource set, the second CSI-RS resource set, and the CSI-RS resource pairs indicated in the CSI configuration information; and performing multi-TRP interference measurements for CSI reporting using the CSI-IM resources associated with the corresponding CSI-RS resource pairs indicated in the CSI configuration information.

[0152] According to some embodiments, the method further includes: determining that a plurality of CSI-interference measurement (IM) resources equal to the larger of the number of CSI-RS resources in the first CSI-RS resource set or the number of CSI-RS resources in the second CSI-RS resource set have been mapped to the CSI-RS resources in the first CSI-RS resource set and the second CSI-RS resource set; and performing single TRP interference measurement for CSI reporting using the CSI-IM resources mapped to the CSI-RS resources associated with the corresponding TRP.

[0153] According to some embodiments, the method further includes: determining that a plurality of CSI-interference measurement (IM) resources equal to the larger of the number of CSI-RS resources in the first CSI-RS resource set or the number of CSI-RS resources in the second CSI-RS resource set have been mapped to the CSI-RS resources in the first CSI-RS resource set and the second CSI-RS resource set; and for each pair of CSI-RS resources indicated in the CSI configuration information, performing multi-TRP interference measurements for CSI reporting using the CSI-IM resources associated with the CSI-RS resources in the larger of the first CSI-RS resource set or the second CSI-RS resource set.

[0154] Yet another set of embodiments may include a cellular base station comprising: an antenna; a radio component operably coupled to the antenna; and a processor operably coupled to the radio component; wherein the cellular base station is configured to: provide channel state information (CSI) configuration information to a wireless device, wherein the CSI configuration information configures CSI reports for multiple transmission reception points (TRPs); and receive CSI reports for multiple TRPs from the wireless device based at least in part on the CSI configuration information.

[0155] According to some embodiments, the CSI configuration information includes information configuring possible CSI measurement resource sets, wherein at least a first possible CSI measurement resource set is associated with a first TRP, and wherein at least a second possible CSI measurement resource set is associated with a second TRP.

[0156] According to some embodiments, the CSI configuration information includes information configuring a first resource for channel measurement, the first resource being associated with a first TRP, wherein the CSI configuration information includes information configuring a second resource for channel measurement, the second resource being associated with a second TRP, wherein the CSI configuration information includes information configuring a resource pair for channel measurement, wherein each pair of resources for channel measurement includes a first resource for channel measurement associated with the first TRP and a second resource for channel measurement associated with the second TRP.

[0157] According to some embodiments, non-zero power (NZP) interference management resources (IMRs) are not configured for the wireless device based at least in part on CSI configuration information configuring CSI reporting for multiple TRPs.

[0158] In some embodiments, the CSI configuration information configures a set of non-zero power (NZP) interference management resources (IMRs) for performing single-TRP and multi-TRP channel interference measurements based at least in part on the CSI configuration information configuring CSI reports for multiple TRPs.

[0159] Yet another example embodiment may include a method comprising performing, by a device, any or all of the foregoing examples.

[0160] Another example embodiment may include a device comprising: an antenna; a radio coupled to the antenna; and a processing element operatively coupled to the radio, wherein the device is configured to implement any or all of the foregoing examples.

[0161] Another exemplary set of embodiments may include a non-transitory computer-accessible memory medium including program instructions that, when executed at a device, cause the device to implement any or all portions of any of the foregoing examples.

[0162] Another exemplary set of embodiments may include a computer program comprising instructions for performing any or all of any of the foregoing examples.

[0163] Another exemplary set of embodiments may include an apparatus comprising means for performing any or all of the elements of any of the preceding examples.

[0164] Another exemplary set of embodiments may include an apparatus comprising a processing element configured to cause a wireless device to perform any or all elements of any of the foregoing examples.

[0165] It is understood that the use of personally identifiable information should be subject to privacy policies and practices that are generally recognized to meet or exceed industry or government requirements for maintaining user privacy. Specifically, personally identifiable information data should be managed and processed to minimize the risk of unintentional or unauthorized access or use, and the nature of authorized use should be clearly stated to users.

[0166] By interpreting each message / signal X received by a user equipment (UE) in the downlink as a message / signal X transmitted by the base station, and interpreting each message / signal Y transmitted by the UE in the uplink as a message / signal Y received by the base station, any of the methods for operating a UE described herein may become the basis for the corresponding method for operating a base station.

[0167] The embodiments of the present disclosure may be implemented in any of a variety of forms. For example, in some embodiments, the subject matter may be implemented as a computer-implemented method, a computer-readable storage medium, or a computer system. In other embodiments, the subject matter may be implemented using one or more custom-designed hardware devices such as ASICs. In other embodiments, the subject matter may be implemented using one or more programmable hardware elements such as FPGAs.

[0168] In some embodiments, a non-transitory computer-readable storage medium (e.g., a non-transitory memory element) may be configured such that it stores program instructions and / or data, wherein the program instructions, if executed by a computer system, cause the computer system to perform a method, such as any of the method embodiments described herein, or any combination of the method embodiments described herein, or any subset of any method embodiments described herein, or any combination of such subsets.

[0169] In some embodiments, a device (e.g., a UE) may be configured to include a processor (or a group of processors) and a memory medium (or a memory element), wherein the memory medium stores program instructions, wherein the processor is configured to read and execute the program instructions from the memory medium, wherein the program instructions are executable to implement any of the various method implementations described herein (or any combination of the method implementations described herein, or any subset of any method implementations described herein, or any combination of such subsets). The device may be implemented in any of various forms.

[0170] Although the above embodiments have been described in considerable detail, numerous variations and modifications will become apparent to those skilled in the art once the above disclosure is fully appreciated. It is intended that the following claims be interpreted to encompass all such variations and modifications.

Claims

1. An apparatus for wireless communication, comprising: a processor configured to cause the wireless device to: receiving channel state information (CSI) report configuration information, wherein the CSI report configuration information has corresponding channel measurement resource (CMR) sets associated with a plurality of transmission reception points (TRPs), the channel measurement resource (CMR) sets including a first set of N1 channel state information reference signal (CSI-RS) resources, a second set of N2 CSI-RS resources, and K pairs of CSI-RS resources, wherein the CMRs include N1+N2+K resources; performing CSI interference measurement on N1+N2+K channel state information interference measurement CSI-IM resources, wherein each CMR is mapped one-to-one to a CSI-IM resource, wherein a first set of N1 CSI-RS resources is mapped to a first index of the CSI-IM in ascending order, a second set of N2 CSI-RS resources is mapped to a second index of the CSI-IM immediately following the first index of the CSI-IM in ascending order, and the K pairs of CSI-RS resources are mapped to a last index of the CSI-IM in ascending order; and CSI reporting is performed based at least in part on the CSI reporting configuration information and in association with the channel state information interference measurement (CSI-IM).

2. The device according to claim 1, The first set of N1 CSI-RS resources is associated with a first TRP, and the second set of N2 CSI-RS resources is associated with a second TRP.

3. The device according to claim 2, The first set of N1 CSI-RS resources includes the first NZP-CSI-RS resource set indicated in the non-zero power channel state information reference signal NZP-CSI-RS resource set list information element IE of the CSI resource configuration radio resource control RRC message, The second set of N2 CSI-RS resources includes the second NZP-CSI-RS resource set indicated in the NZP-CSI-RS resource set list IE of the CSI resource configuration RRC message.

4. The device according to claim 1, The CSI report configuration information includes information configuring a first resource for channel measurement associated with a first TRP in a first channel measurement resource information element IE of a CSI report configuration radio resource control RRC message, The CSI report configuration information includes information configuring a second resource for channel measurement associated with a second TRP in the second channel measurement resource IE of the CSI report configuration RRC message.

5. The device according to claim 1, The CSI report configuration information indicates one or more pairs of CSI-RS resources, wherein each pair of CSI-RS resources includes a CSI-RS resource associated with a first TRP and a CSI-RS resource associated with a second TRP.

6. The device according to claim 1, The CSI reporting configuration information configures a set of non-zero power (NZP) interference management resources (IMRs) for performing single TRP and multi-TRP channel interference measurements.

7. A method for wireless communication, comprising: receiving channel state information (CSI) report configuration information having corresponding channel measurement resources (CMRs) associated with a plurality of transmission reception points (TRPs), the CMRs including a first set of N1 channel state information reference signal (CSI-RS) resources, a second set of N2 CSI-RS resources, and K pairs of CSI-RS resources, wherein the CMRs include N1+N2+K resources; performing CSI interference measurement on N1+N2+K channel state information interference measurement CSI-IM resources, wherein each CMR is mapped one-to-one to a CSI-IM resource, wherein a first set of N1 CSI-RS resources is mapped to a first index of the CSI-IM in ascending order, a second set of N2 CSI-RS resources is mapped to a second index of the CSI-IM immediately following the first index of the CSI-IM in ascending order, and the K pairs of CSI-RS resources are mapped to a last index of the CSI-IM in ascending order; and CSI reporting is performed based at least in part on the CSI reporting configuration information and in association with the channel state information interference measurement (CSI-IM).

8. The method according to claim 7, The first set of N1 CSI-RS resources is associated with a first TRP, and the second set of N2 CSI-RS resources is associated with a second TRP.

9. The method according to claim 8, The first set of N1 CSI-RS resources includes the first NZP-CSI-RS resource set indicated in the non-zero power channel state information reference signal NZP-CSI-RS resource set list information element IE of the CSI resource configuration radio resource control RRC message, The second set of N2 CSI-RS resources includes the second NZP-CSI-RS resource set indicated in the NZP-CSI-RS resource set list IE of the CSI resource configuration RRC message.

10. The method according to claim 7, The CSI report configuration information includes information configuring a first resource for channel measurement associated with a first TRP in a first channel measurement resource information element IE of a CSI report configuration radio resource control RRC message, The CSI report configuration information includes information configuring a second resource for channel measurement associated with a second TRP in the second channel measurement resource IE of the CSI report configuration RRC message.

11. The method according to claim 7, The CSI report configuration information indicates one or more pairs of CSI-RS resources, wherein each pair of CSI-RS resources includes a CSI-RS resource associated with a first TRP and a CSI-RS resource associated with a second TRP.

12. The method according to claim 7, The CSI reporting configuration information configures a set of non-zero power (NZP) interference management resources (IMRs) for performing single TRP and multi-TRP channel interference measurements.

13. The method of claim 7, wherein the number of CSI-IM resources is equal to the total number of channel measurement resources (CMRs) in both the first set of N1 CSI-RS resources and the second set of N2 CSI-RS resources.

14. According to the method according to claim 7, the CSI report configuration information indicates one or more pairs of CSI-RS resources, wherein each pair of CSI-RS resources includes a CSI-RS resource associated with a first TRP and a CSI-RS resource associated with a second TRP, and wherein the number of CSI-IM resources is equal to the channel measurement resources CMR in both the first set of N1 CSI-RS resources and the second set of N2 CSI-RS resources plus the total number of the one or more pairs of CSI-RS resources. The method according to claim 7 , wherein the first CSI-RS resource and the second CSI-RS resource are indicated using a bitmap.

16. A cellular base station, comprising: antenna; a radio operatively coupled to the antenna; as well as a processor operatively coupled to the radio; The cellular base station is configured to: providing channel state information (CSI) reporting configuration information to a wireless device, wherein the CSI reporting configuration information has corresponding channel measurement resource (CMR) sets associated with a plurality of transmission reception points (TRPs), the channel measurement resource (CMR) sets comprising a first set of N1 channel state information reference signal (CSI-RS) resources, a second set of N2 CSI-RS resources, and K pairs of CSI-RS resources, wherein the CMRs comprise N1+N2+K resources, wherein to enable the wireless device to perform CSI interference measurement on the N1+N2+K channel state information interference measurement (CSI-IM) resources, each CMR is mapped one-to-one to a CSI-IM resource, wherein the first set of N1 CSI-RS resources is mapped to a first index of the CSI-IM in ascending order, the second set of N2 CSI-RS resources is mapped to a second index of the CSI-IM immediately following the first index of the CSI-IM in ascending order, and the K pairs of CSI-RS resources are mapped to a last index of the CSI-IM in ascending order; and CSI reports are received from a plurality of TRPs and from the wireless device based at least in part on the CSI reporting configuration information and in association with the channel state information interference measurement (CSI-IM).

17. The cellular base station according to claim 16, The first set of N1 CSI-RS resources is associated with a first TRP, and the second set of N2 CSI-RS resources is associated with a second TRP.

18. The cellular base station according to claim 16, The CSI report configuration information includes information configuring a first resource for channel measurement, where the first resource is associated with a first TRP. The CSI report configuration information includes information for configuring a second resource for channel measurement, where the second resource is associated with a second TRP. The CSI report configuration information includes information for configuring resource pairs for channel measurement, wherein each pair of resources for channel measurement includes a first resource for channel measurement associated with the first TRP and a second resource for channel measurement associated with the second TRP.

19. The cellular base station according to claim 16, Wherein non-zero power (NZP) interference management resources (IMRs) are not configured for the wireless device based at least in part on the CSI reporting configuration information that configures CSI reporting for multiple TRPs.

20. The cellular base station according to claim 16, The CSI reporting configuration information configures a set of non-zero power (NZP) interference management resources (IMRs) for performing single TRP and multi-TRP channel interference measurements based at least in part on the CSI reporting configuration information for configuring CSI reports for multiple TRPs.

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