Multiple-input multiple-output layer adaptation

Abstract

Aspects of the present disclosure generally relate to wireless communications. In some aspects, a user equipment (UE) may identify a maximum number of most input multiple output (MIMO) layers for communication based at least in part on at least one of: a number of channel state information reference signal (CSI-RS) ports associated with a network node, or a transmission receive point (TRP) associated with the network node to or from a dormant state. The UE may perform communications according to the maximum number of MIMO layers. Numerous other aspects are described.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This patent application claims priority to U.S. Patent Application No. 17 / 931,144, filed on September 12, 2022, entitled “MULTIPLE-INPUTMULTIPLE-OUTPUT LAYER ADAPTATION,” which is assigned to the assignee of this application. The disclosure of the prior application is considered a part of this patent application and is incorporated by reference into this patent application. Technical Field

[0003] Aspects of the present disclosure generally relate to wireless communications and techniques and apparatus for multiple-input multiple-output (MIMO) layer adaptation. Background Art

[0004] Wireless communication systems are widely deployed to provide a variety of telecommunication services, such as telephony, video, data, messaging, and broadcasting. Typical wireless communication systems may employ multiple access technologies that can support communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). 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, time division synchronous code division multiple access (TD-SCDMA) systems, and long term evolution (LTE). LTE / LTE-Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3GPP).

[0005] A wireless network may include one or more network nodes that support communication of wireless communication devices such as a user equipment (UE) or multiple UEs. A UE may communicate with a network node via downlink communication and uplink communication. A "downlink" (or "DL") refers to a communication link from a network node to a UE, and an "uplink" (or "UL") refers to a communication link from a UE to a network node. Some wireless networks may support device-to-device communication, for example, via a local link (e.g., a sidelink (SL), a wireless local area network (WLAN) link, and / or a wireless personal area network (WPAN) link, among other examples).

[0006] The above-mentioned multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different UEs to communicate at a municipal, national, regional and / or global level. New Radio (NR), which may be referred to as 5G, is a set of enhancements to the LTE mobile standard promulgated by 3GPP. NR aims to better support mobile broadband Internet access by improving spectrum efficiency, reducing costs, improving services, utilizing new spectrum, and better integrating with other open standards using orthogonal frequency division multiplexing (OFDM) with cyclic prefix (CP) (CP-OFDM) on the downlink, using CP-OFDM and / or single carrier frequency division multiplexing (SC-FDM) (also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink, and supporting beamforming, multiple input multiple output (MIMO) antenna technology and carrier aggregation. As the demand for mobile broadband access continues to grow, further improvements in LTE, NR and other radio access technologies remain useful. Summary of the invention

[0007] Some aspects described herein relate to a method of wireless communication performed by a user equipment (UE). The method may include identifying a maximum number of multiple-input multiple-output (MIMO) layers for communication based at least in part on at least one of: a number of channel state information reference signal (CSI-RS) ports associated with a network node, or a transition of a transmission reception point (TRP) associated with the network node to a dormant state or from a dormant state. The method may include performing communication according to the maximum number of MIMO layers.

[0008] Some aspects described herein relate to a method of wireless communication performed by a network node. The method may include sending at least one of the following: information indicating a number of CSI-RS ports associated with the network node, or information indicating a transition of a TRP associated with the network node to a dormant state or from a dormant state. The method may include performing communication according to a maximum number of MIMO layers, wherein the maximum number of MIMO layers is based at least in part on at least one of the number of CSI-RS ports or the transition of the TRP to the dormant state.

[0009] Some aspects described herein relate to an apparatus for a UE for wireless communication. The apparatus may include a memory and one or more processors coupled to the memory. The one or more processors may be configured to identify a maximum number of MIMO layers for communication based at least in part on at least one of a number of CSI-RS ports associated with a network node or a transition of a TRP associated with the network node to a sleep state or from a sleep state. The one or more processors may be configured to perform communication according to the maximum number of MIMO layers.

[0010] Some aspects described herein relate to a network node for wireless communication. The network node may include a memory and one or more processors coupled to the memory. The one or more processors may be configured to send at least one of the following: information indicating the number of CSI-RS ports associated with the network node, or information indicating a transition of a TRP associated with the network node to a sleep state or from a sleep state. The one or more processors may be configured to perform communication according to a maximum number of MIMO layers, wherein the maximum number of MIMO layers is based at least in part on at least one of the number of CSI-RS ports or the transition of the TRP to the sleep state.

[0011] Some aspects described herein relate to a non-transitory computer-readable medium storing an instruction set for a UE to perform wireless communications. When executed by one or more processors of the UE, the instruction set may cause the UE to identify a maximum number of MIMO layers for communication based at least in part on at least one of the following: a number of CSI-RS ports associated with a network node, or a transition of a TRP associated with the network node to a sleep state or from a sleep state. When the instruction set is executed by one or more processors of the UE, the UE may be caused to perform communications according to the maximum number of MIMO layers.

[0012] Some aspects described herein relate to a non-transitory computer-readable medium storing an instruction set for a network node to perform wireless communications. When executed by one or more processors of the network node, the instruction set may cause the network node to send at least one of the following: information indicating a number of CSI-RS ports associated with the network node, or information indicating a transition of a TRP associated with the network node to a sleep state or from a sleep state. When executed by one or more processors of the network node, the instruction set may cause the network node to perform communications based on a maximum number of MIMO layers, wherein the maximum number of MIMO layers is based at least in part on at least one of the number of CSI-RS ports or the transition of the TRP to the sleep state.

[0013] Some aspects described herein relate to an apparatus for wireless communication. The apparatus may include means for identifying a maximum number of MIMO layers for communication based at least in part on at least one of a number of CSI-RS ports associated with a network node or a transition of a TRP associated with the network node to a dormant state or from a dormant state. The apparatus may include means for performing communication according to the maximum number of MIMO layers.

[0014] Some aspects described herein relate to an apparatus for wireless communication. The apparatus may include means for sending at least one of the following: information indicating a number of CSI-RS ports associated with a network node, or information indicating a transition of a TRP associated with the network node to a dormant state or from a dormant state. The apparatus may include means for performing communication according to a maximum number of MIMO layers, wherein the maximum number of MIMO layers is based at least in part on at least one of the number of CSI-RS ports or the transition of the TRP to the dormant state.

[0015] Aspects generally include methods, apparatus, systems, computer program products, non-transitory computer-readable media, user equipment, base stations, network entities, network nodes, wireless communication devices, and / or processing systems substantially as described herein with reference to and as illustrated in the accompanying drawings.

[0016] The foregoing has been a fairly extensive overview of the features and technical advantages of examples according to the present disclosure so that the following detailed description may be better understood. Additional features and advantages will be described below. The disclosed concepts and specific examples may be easily used as a basis for modifying or designing other structures for achieving the same purpose as the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The features of the concepts disclosed herein, their organization and methods of operation, and associated advantages will be better understood from the following description when considered in conjunction with the accompanying drawings. Each of the accompanying drawings is provided for the purpose of illustration and description, and not as a definition of the limitations of the claims.

[0017] Although various aspects are described in the present disclosure by illustrating some examples, it will be understood by those skilled in the art that these aspects can be implemented in many different arrangements and scenarios. The technology described herein can be implemented using different platform types, devices, systems, shapes, sizes and / or packaging arrangements. For example, some aspects can be implemented via integrated chip embodiments or other devices based on non-module components (e.g., end-user devices, vehicles, communication devices, computing devices, industrial equipment, retail / purchasing devices, medical devices and / or artificial intelligence devices). Various aspects can be implemented with chip-level components, modular components, non-modular components, non-chip-level components, device-level components and / or system-level components. The device incorporating the described aspects and features may include additional components and features for the implementation and practice of the claimed and described aspects. For example, the transmission and reception of wireless signals may include one or more components for analog and digital purposes (e.g., hardware components including antennas, radio frequency (RF) chains, power amplifiers, modulators, buffers, processors, interleavers, adders and / or summers). The various aspects described herein are intended to be practiced in devices, components, systems, distributed arrangements and / or end-user devices of various sizes, shapes and configurations. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to be able to understand the above-mentioned features of the present disclosure in detail, reference may be made to various aspects for a more specific description briefly summarized above, some of which are shown in the accompanying drawings. However, it should be noted that the accompanying drawings only illustrate certain typical aspects of the present disclosure and therefore should not be considered as limiting the scope thereof, as the description may allow for other equally effective aspects. The same reference numerals in different drawings may identify the same or similar elements.

[0019] Figure 1 is a diagram illustrating an example of a wireless network according to the present disclosure.

[0020] Figure 2 is a diagram illustrating an example of a network node communicating with a user equipment (UE) in a wireless network according to the present disclosure.

[0021] Figure 3 is a diagram illustrating an example decomposed base station architecture according to the present disclosure.

[0022] Figure 4 is a diagram illustrating an example of a channel state information reference signal (CSI-RS) beam management process according to the present disclosure.

[0023] Figure 5 is a diagram illustrating an example of dynamic network-side antenna adaptation according to the present disclosure.

[0024] Figure 6 An example logical architecture of a distributed radio access network (RAN) according to the present disclosure is shown.

[0025] Figure 7 is a diagram illustrating an example of multiple transmission reception point (TRP) communications according to the present disclosure.

[0026] Figure 8 is a diagram illustrating an example of multiple-input multiple-output (MIMO) communication according to the present disclosure.

[0027] Fig. 9 is a diagram illustrating an example of adapting a maximum number of MIMO layers based at least in part on a number of CSI-RS ports associated with a network node in accordance with the present disclosure.

[0028] Fig.10 is a diagram illustrating an example of adapting a maximum number of MIMO layers based at least in part on a transition of a TRP to a sleep state in accordance with the present disclosure.

[0029] Fig.11 is a diagram illustrating an example process performed, for example, by a UE according to the present disclosure.

[0030] Fig.12 is a diagram illustrating an example process, for example, performed by a network node, according to the present disclosure.

[0031] Fig.13 is a diagram of an example apparatus for wireless communications according to the present disclosure.

[0032] Fig.14 is a diagram of an example apparatus for wireless communications according to the present disclosure.

[0033] Specific implementation method

[0034] Various aspects of the present disclosure are described more fully below with reference to the accompanying drawings. However, the present disclosure can be embodied in many different forms and should not be construed as being limited to any specific structure or function presented throughout the present disclosure. On the contrary, these aspects are provided so that the present disclosure will be thorough and complete, and the scope of the present disclosure will be fully conveyed to those skilled in the art. It should be understood by those skilled in the art that the scope of the present disclosure is intended to cover any aspect of the present disclosure disclosed herein, whether implemented independently of any other aspect of the present disclosure or implemented in combination with any other aspect of the present disclosure. For example, any number of aspects set forth herein can be used to implement a device or a method can be practiced. In addition, the scope of the present disclosure is intended to cover devices or methods practiced using other structures, functions, or structures and functions other than the various aspects of the present disclosure set forth herein. It should be understood that any aspect of the disclosure disclosed herein can be embodied by one or more elements of the claims.

[0035] Several aspects of telecommunication systems will now be presented with reference to various devices and techniques. These devices and techniques will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as "elements"). These elements may be implemented using hardware, software, or a combination thereof. Whether these elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0036] Although various aspects may be described herein using terms generally associated with 5G or new radio (NR) radio access technology (RAT), various aspects of the present disclosure may be applied to other RATs, such as 3G RAT, 4G RAT, and / or RATs beyond 5G (e.g., 6G).

[0037] Figure 11 is a diagram showing an example of a wireless network 100 according to the present disclosure. The wireless network 100 may be or may include elements of a 5G (e.g., NR) network and / or a 4G (e.g., Long Term Evolution (LTE)) network, etc. The wireless network 100 may include one or more network nodes 110 (shown as network node 110a, network node 110b, network node 110c, and network node 110d), a user equipment (UE) 120 or multiple UEs 120 (shown as UE 120a, UE 120b, UE 120c, UE 120d, and UE 120e), and / or other entities. The network node 110 is a network node that communicates with the UE 120. As shown in the figure, the network node 110 may include one or more network nodes. For example, the network node 110 may be an aggregated network node, meaning that the aggregated network node is configured to utilize a radio protocol stack that is physically or logically integrated within a single radio access network (RAN) node (e.g., within a single device or unit). As another example, the network node 110 may be a disaggregated network node (sometimes referred to as a disaggregated base station), meaning that the network node 110 is configured to utilize a protocol stack that is physically or logically distributed between two or more nodes (e.g., one or more central units (CUs), one or more distributed units (DUs), or one or more radio units (RUs)).

[0038] In some examples, the network node 110 is or includes a network node that communicates with the UE 120 via a radio access link (e.g., RU). In some examples, the network node 110 is or includes a network node that communicates with other network nodes 110 via a fronthaul link or a midhaul link, for example, a DU. In some examples, the network node 110 is or includes a network node that communicates with other network nodes 110 via a midhaul link or communicates with a core network via a backhaul link, for example, a CU. In some examples, the network node 110 (such as an aggregated network node 110 or a decomposed network node 110) may include multiple network nodes, such as one or more RUs, one or more CUs, and / or one or more DUs. The network node 110 may include, for example, an NR base station, an LTE base station, a Node B, an eNB (e.g., in 4G), a gNB (e.g., in 5G), an access point, a transmission reception point (TRP), a DU, a RU, a CU, a mobile element of a network, a core network node, a network element, a network device, a RAN node, or a combination thereof. In some examples, network nodes 110 may be interconnected with each other or with one or more other network nodes 110 in wireless network 100 via various types of fronthaul, midhaul, and / or backhaul interfaces (e.g., direct physical connections, air interfaces, or virtual networks) using any suitable transport network.

[0039] In some examples, the network node 110 may provide communication coverage for a particular geographic area. In the Third Generation Partnership Project (3GPP), the term "cell" may refer to a coverage area of ​​the network node 110 and / or a network node subsystem serving the coverage area, depending on the context in which the term is used. The network node 110 may provide communication coverage for a macro cell, a pico cell, a femto cell, and / or other types of cells. A macro cell may cover a relatively large geographic area (e.g., a radius of several kilometers) and may allow unrestricted access to a UE 120 with a service subscription. A pico cell may cover a relatively small geographic area and may allow unrestricted access to a UE 120 with a service subscription. A femto cell may cover a relatively small geographic area (e.g., a home) and may allow restricted access to a UE 120 associated with the femto cell (e.g., a UE 120 in a closed subscriber group (CSG)). A network node 110 for a macro cell may be referred to as a macro network node. A network node 110 for a pico cell may be referred to as a pico network node. A network node 110 for a femto cell may be referred to as a femto network node or a home network node. In Figure 1 In the example shown, network node 110a may be a macro network node of macro cell 102a, network node 110b may be a micro network node of micro cell 102b, and network node 110c may be a micro network node of micro cell 102c. A network node may support one or more (e.g., three) cells. In some examples, a cell is not necessarily fixed, and the geographic area of ​​a cell may move according to the location of a mobile network node 110 (e.g., a mobile network node). In some examples, a "cell" may refer to a carrier, such as a component carrier of a carrier aggregation configuration (e.g., a primary cell, a secondary cell, etc.). In some examples, a "cell" may refer to a TRP.

[0040] In some aspects, the term "base station" or "network node" may refer to an aggregated base station, a decomposed base station, an integrated access and backhaul (IAB) node, a relay node, or one or more components thereof. For example, in some aspects, a "base station" or "network node" may refer to a CU, a DU, a RU, a near real-time (near RT) RAN intelligent controller (RIC) or a non-real-time (non-RT) RIC or a combination thereof. In some aspects, the term "base station" or "network node" may refer to a device configured to perform one or more functions, such as those described herein in conjunction with the network node 110. In some aspects, the term "base station" or "network node" may refer to multiple devices configured to perform one or more functions. For example, in some distributed systems, each of a plurality of different devices (which may be located in the same geographic location or in different geographic locations) may be configured to perform at least a portion of a function, or to replicate the execution of at least a portion of a function, and the term "base station" or "network node" may refer to any one or more of those different devices. In some aspects, the term "base station" or "network node" may refer to one or more virtual base stations or one or more virtual base station functions. For example, in some aspects, two or more base station functions may be instantiated on a single device. In some aspects, the term "base station" or "network node" may refer to one of the base station functions but not the other. In this way, a single device may include more than one base station.

[0041] The wireless network 100 may include one or more relay stations. A relay station is a network node that can receive data transmissions from an upstream node (e.g., a network node 110 or a UE 120) and send data transmissions to a downstream node (e.g., a UE 120 or a network node 110). A relay station may be a UE 120 that is capable of relaying transmissions for other UEs 120. Figure 1 In the example shown, a network node 110d (e.g., a relay network node) may communicate with a network node 110a (e.g., a macro network node) and a UE 120d to facilitate communication between the network node 110a and the UE 120d. A network node 110 that relays communications may be referred to as a relay station, a relay base station, a relay network node, a relay node, a relay station, etc.

[0042] The wireless network 100 may be a heterogeneous network including different types of network nodes 110, such as macro network nodes, pico network nodes, femto network nodes, relay network nodes, etc. These different types of network nodes 110 may have different transmit power levels, different coverage areas, and / or different impacts on interference in the wireless network 100. For example, a macro network node may have a high transmit power level (e.g., 5 to 40 Watts), while a pico network node, a femto network node, and a relay network node may have a lower transmit power level (e.g., 0.1 to 2 Watts).

[0043] The network controller 130 may be coupled to or communicate with a group of network nodes 110 and may provide coordination and control for these network nodes 110. The network controller 130 may communicate with the network nodes 110 via a backhaul communication link or a mid-range communication link. The network nodes 110 may communicate with each other directly or indirectly via a wireless or wired backhaul communication link. In some aspects, the network controller 130 may be a CU or a core network device, or may include a CU or a core network device.

[0044] UE 120 can be dispersed throughout the wireless network 100, and each UE 120 can be fixed or mobile. UE 120 can include, for example, access terminals, terminals, mobile stations, and / or subscriber units. UE 120 can be a cellular phone (e.g., a smart phone), a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet computer, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device, a biometric device, a wearable device (e.g., a smart watch, smart clothing, smart glasses, a smart wristband, smart jewelry (e.g., a smart ring or smart bracelet)), an entertainment device (e.g., a music device, a video device, and / or a satellite radio), a vehicle component or sensor, a smart meter / sensor, an industrial manufacturing device, a global positioning system device, a UE function of a network node, and / or any other suitable device configured to communicate via a wireless or wired medium.

[0045] Some UEs 120 may be considered as machine type communication (MTC) or evolved or enhanced machine type communication (eMTC) UEs. MTC UEs and / or eMTC UEs may include, for example, robots, drones, remote devices, sensors, meters, monitors and / or location tags that may communicate with a network node, another device (e.g., a remote device), or some other entity. Some UEs 120 may be considered as Internet of Things (IoT) devices, and / or may be implemented as NB-IoT (narrowband IoT) devices. Some UEs 120 may be considered as customer premises equipment. UE 120 may be included in a housing that houses components (e.g., processor components and / or memory components) of UE 120. In some examples, the processor component and the memory component may be coupled together. For example, a processor component (e.g., one or more processors) and a memory component (e.g., a memory) may be operably coupled, communicatively coupled, electronically coupled, and / or electrically coupled.

[0046] In general, any number of wireless networks 100 may be deployed in a given geographic area. Each wireless network 100 may support a specific RAT and may operate on one or more frequencies. RAT may be referred to as a radio technology, air interface, etc. Frequency may be referred to as a carrier, channel, etc. Each frequency may support a single RAT in a given geographic area to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks may be deployed.

[0047] In some examples, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) can communicate directly (e.g., without using network node 110 as an intermediary for communicating with each other) using one or more sidelink channels. For example, UE 120 can communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocol (e.g., which may include vehicle-to-vehicle (V2V) protocol, vehicle-to-infrastructure (V2I) protocol, or vehicle-to-pedestrian (V2P) protocol) and / or mesh network. In such examples, UE 120 can perform scheduling operations, resource selection operations, and / or other operations performed by network node 110 described elsewhere herein.

[0048] Devices of the wireless network 100 may communicate using an electromagnetic spectrum, which may be subdivided into various categories, bands, channels, etc., by frequency or wavelength. For example, devices of the wireless network 100 may communicate using one or more operating bands. In 5G NR, two initial operating bands are identified as frequency range names FR1 (410 MHz–7.125 GHz) and FR2 (24.25 GHz–52.6 GHz). It should be understood that although a portion of FR1 is greater than 6 GHz, FR1 is often referred to (interchangeably) as a “Sub-6 GHz” band in various documents and articles. Similar naming issues sometimes occur with FR2, which is often referred to (interchangeably) as a “millimeter wave” band in documents and articles, although it is different from the extremely high frequency (EHF) band (30 GHz–300 GHz), and EHF is recognized as a “millimeter wave” band by the International Telecommunication Union (ITU).

[0049] Frequencies between FR1 and FR2 are generally referred to as mid-band frequencies. Recent 5G NR research has identified the operating bands for these mid-band frequencies as the frequency range designation FR3 (7.125 GHz–24.25 GHz). Frequency bands that fall within FR3 may inherit FR1 characteristics and / or FR2 characteristics, and may therefore effectively extend the characteristics of FR1 and / or FR2 to mid-band frequencies. In addition, higher frequency bands are currently being explored to extend 5G NR operation above 52.6 GHz. For example, three higher operating bands have been identified as the frequency range designations FR4a or FR4-1 (52.6 GHz–71 GHz), FR4 (52.6 GHz–114.25 GHz), and FR5 (114.25 GHz–300 GHz). Each of these higher frequency bands belongs to the EHF band.

[0050] With the above examples in mind, unless otherwise specifically stated, it should be understood that the terms "sub-6 GHz," etc., if used herein, may broadly refer to frequencies that may be less than 6 GHz, may be within FR1, or may include mid-band frequencies. In addition, unless otherwise specifically stated, it should be understood that the terms "millimeter wave," etc., if used herein, may broadly refer to frequencies that may include mid-band frequencies, may be within FR2, FR4, FR4-a or FR4-1, and / or FR5, or may be within the EHF band. It is contemplated that the frequencies included in these operating bands (e.g., FR1, FR2, FR3, FR4, FR4-a, FR4-1, and / or FR5) may be modified, and the techniques described herein are applicable to those modified frequency ranges.

[0051] In some aspects, UE 120 may include a communication manager 140. As described in greater detail elsewhere herein, the communication manager 140 may identify a maximum number of multiple-input multiple-output (MIMO) layers for communication based at least in part on at least one of: a number of channel state information reference signal (CSI-RS) ports associated with a network node, or a transition of a transmission reception point (TRP) associated with the network node to or from a dormant state; and communicate in accordance with the maximum number of MIMO layers. Additionally or alternatively, the communication manager 140 may perform one or more other operations described herein.

[0052] In some aspects, the network node may include a communication manager 150. As described in more detail elsewhere herein, the communication manager 150 may send at least one of: information indicating a number of CSI-RS ports associated with the network node, or information indicating a transition of a TRP associated with the network node to a dormant state or from a dormant state; and perform communications according to a maximum number of MIMO layers, wherein the maximum number of MIMO layers is based at least in part on at least one of the number of CSI-RS ports or the transition of the TRP to the dormant state. Additionally or alternatively, the communication manager 150 may perform one or more other operations described herein.

[0053] As mentioned above, providing Figure 1 as an example. Other examples may be related to Figure 1 Different from what is described in .

[0054] Figure 2 2 is a diagram illustrating an example 200 of a network node 110 communicating with a user equipment (UE) 120 in a wireless network 100 according to the present disclosure. The network node 110 may be equipped with a set of antennas 234a to 234t, such as T antennas (T≥1). The UE 120 may be equipped with a set of antennas 252a to 252r, such as R antennas (R≥1). The network node 110 of example 200 includes one or more radio frequency components, such as an antenna 234 and a modem 232. In some examples, the network node 110 may include an interface, a communication component, or another component that facilitates communication with the UE 120 or another network node. Some network nodes 110 may not include radio frequency components that facilitate direct communication with the UE 120, such as one or more CUs, or one or more DUs.

[0055] At the network node 110, a transmit processor 220 may receive data intended for a UE 120 (or a group of UEs 120) from a data source 212. The transmit processor 220 may select one or more modulation and coding schemes (MCS) for the UE 120 based at least in part on one or more channel quality indicators (CQIs) received from the UE 120. The network node 110 may process (e.g., encode and modulate) data for the UE 120 based at least in part on the MCS selected for the UE 120, and may provide data symbols for the UE 120. The transmit processor 220 may process system information (e.g., for semi-static resource partitioning information (SRPI)) and control information (e.g., CQI requests, grants, and / or upper layer signaling) and provide overhead symbols and control symbols. The transmit processor 220 may generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS) or demodulation reference signals (DMRS)) and synchronization signals (e.g., primary synchronization signals (PSS) or secondary synchronization signals (SSS)). The transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on ​​data symbols, control symbols, overhead symbols, and / or reference symbols (if applicable), and may provide a set of output symbol streams (e.g., T output symbol streams) to a corresponding set of modems 232 (e.g., T modems), shown as modems 232a to 232t. For example, each output symbol stream may be provided to a modulator component (shown as MOD) of the modem 232. Each modem 232 may process a corresponding output symbol stream (e.g., for OFDM) using a corresponding modulator component to obtain an output sample stream. Each modem 232 may also process (e.g., convert to analog, amplify, filter, and / or upconvert) the output sample stream using a corresponding modulator component to obtain a downlink signal. The modems 232a to 232t may transmit a set of downlink signals (e.g., T downlink signals) via a corresponding set of antennas 234 (e.g., T antennas), shown as antennas 234a to 234t.

[0056] At the UE 120, a group of antennas 252 (shown as antennas 252a to 252r) can receive downlink signals from the network node 110 and / or other network nodes 110, and a group of received signals (e.g., R received signals) can be provided to a group of modems 254 (e.g., R modems), shown as modems 254a to 254r. For example, each received signal can be provided to a demodulator component (shown as DEMOD) of the modem 254. Each modem 254 can use a corresponding demodulator component to condition (e.g., filter, amplify, downconvert and / or digitize) the received signal to obtain input samples. Each modem 254 can use a demodulator component to further process the input samples (e.g., for OFDM) to obtain received symbols. A MIMO detector 256 can obtain received symbols from the modem 254, can perform MIMO detection on the received symbols where applicable, and can provide detected symbols. The receive processor 258 may process (e.g., demodulate and decode) detected symbols, may provide decoded data for the UE 120 to a data sink 260, and may provide decoded control information and system information to a controller / processor 280. The term "controller / processor" may refer to one or more controllers, one or more processors, or a combination thereof. The channel processor may determine a reference signal received power (RSRP) parameter, a received signal strength indicator (RSSI) parameter, a reference signal received quality (RSRQ) parameter, and / or a CQI parameter, among other examples. In some examples, one or more components of the UE 120 may be included in a housing 284.

[0057] The network controller 130 may include a communication unit 294, a controller / processor 290, and a memory 292. The network controller 130 may include, for example, one or more devices in a core network. The network controller 130 may communicate with the network node 110 via the communication unit 294.

[0058] One or more antennas (e.g., antennas 234a to 234t and / or antennas 252a to 252r) may include or may be included in one or more antenna panels, one or more antenna groups, one or more groups of antenna elements, and / or one or more antenna arrays, among other examples. An antenna panel, an antenna group, a group of antenna elements, and / or an antenna array may include one or more antenna elements (within a single housing or multiple housings), a group of coplanar antenna elements, a group of non-coplanar antenna elements, and / or a plurality of antenna elements coupled to one or more transmit and / or receive components (such as Figure 2 One or more antenna elements of one or more components).

[0059] On the uplink, at the UE 120, a transmit processor 264 may receive and process data from a data source 262 and control information from a controller / processor 280 (e.g., for reporting including RSRP, RSSI, RSRQ, and / or CQI). The transmit processor 264 may generate reference symbols for one or more reference signals. The symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266 (if applicable), further processed by a modem 254 (e.g., for DFT-s-OFDM or CP-OFDM), and transmitted to the network node 110. In some examples, the modem 254 of the UE 120 may include a modulator and a demodulator. In some examples, the UE 120 includes a transceiver. The transceiver may include any combination of an antenna 252, a modem 254, a MIMO detector 256, a receive processor 258, a transmit processor 264, and / or a TX MIMO processor 266. A processor (eg, controller / processor 280) and memory 282 may use a transceiver to perform aspects of any of the methods described herein (eg, reference Figure 3-Figure 14 ).

[0060] At the network node 110, uplink signals from the UE 120 and / or other UEs may be received by an antenna 234, processed by a modem 232 (e.g., a demodulator component of the modem 232, shown as DEMOD), detected by a MIMO detector 236 (if applicable), and further processed by a receive processor 238 to obtain decoded data and control information sent by the UE 120. The receive processor 238 may provide the decoded data to a data sink 239 and provide the decoded control information to a controller / processor 240. The network node 110 may include a communication unit 244 and may communicate with the network controller 130 via the communication unit 244. The network node 110 may include a scheduler 246 to schedule one or more UEs 120 for downlink and / or uplink communications. In some examples, the modem 232 of the network node 110 may include a modulator and a demodulator. In some examples, the network node 110 includes a transceiver. The transceiver may include any combination of an antenna 234, a modem 232, a MIMO detector 236, a receive processor 238, a transmit processor 220, and / or a TX MIMO processor 230. A processor (e.g., controller / processor 240) and memory 242 may use the transceiver to perform aspects of any of the methods described herein (e.g., reference numerals 244, 245, 246, 247, 248, 249, 250, 261, 262, 264, 265, 266, 267, 268, 269, 270, 271, 273, 274, 276, 277, 278, 279, 280, 291, 292, 293, 29 Figure 3-Figure 14 ).

[0061] The controller / processor 240 of the network node 110, the controller / processor 280 of the UE 120, and / or Figure 2Any other components of the UE 120 may perform one or more techniques associated with MIMO communication, as described in more detail elsewhere herein. For example, the controller / processor 240 of the network node 110, the controller / processor 280 of the UE 120, and / or Figure 2 Any other component of the can perform or direct e.g. Fig.11 Process 1100, Fig.12 1200 and / or other processes described herein. Memory 242 and memory 282 may store data and program codes for network node 110 and UE 120, respectively. In some examples, memory 242 and / or memory 282 may include a non-transitory computer-readable medium storing one or more instructions (e.g., code and / or program code) for wireless communication. For example, when executed by one or more processors of network node 110 and / or UE 120 (e.g., directly, or after compilation, conversion, and / or interpretation), the one or more instructions may cause one or more processors, UE 120, and / or network node 110 to perform or direct, for example, Fig.11 Process 1100, Fig.12 The process 1200 and / or operations of other processes as described herein. In some examples, executing instructions may include running instructions, converting instructions, compiling instructions, and / or interpreting instructions, among other examples.

[0062] In some aspects, a UE (e.g., UE 120) includes means for identifying a maximum number of multiple-input multiple-output (MIMO) layers for communication based at least in part on at least one of: a number of channel state information reference (CSI-RS) ports associated with a network node, or a transition of a transmission reception point (TRP) associated with the network node to or from a dormant state; and / or means for performing communication in accordance with the maximum number of MIMO layers. In some aspects, the means for the UE to perform operations described herein may include, for example, one or more of the communication manager 140, the antenna 252, the modem 254, the MIMO detector 256, the receive processor 258, the transmit processor 264, the TX MIMO processor 266, the controller / processor 280, or the memory 282.

[0063] In some aspects, a network node (e.g., network node 110) includes means for transmitting at least one of: information indicating a number of CSI-RS ports associated with the network node, or information indicating a transition of a TRP associated with the network node to a dormant state or from a dormant state; and / or means for performing communications according to a maximum number of MIMO layers, wherein the maximum number of MIMO layers is based at least in part on at least one of the number of CSI-RS ports or the transition of the TRP to a dormant state. In some aspects, the means for the network node to perform operations described herein may include, for example, one or more of the communication manager 150, the transmit processor 220, the TX MIMO processor 230, the modem 232, the antenna 234, the MIMO detector 236, the receive processor 238, the controller / processor 240, the memory 242, or the scheduler 246.

[0064] Although Figure 2 The blocks in the 200 are shown as distinct components, but the functionality described above with respect to the blocks may be implemented in a single hardware, software, or combined component or in various combinations of components. For example, the functionality described with respect to the transmit processor 264, the receive processor 258, and / or the TX MIMO processor 266 may be performed by or under the control of the controller / processor 280.

[0065] As mentioned above, providing Figure 2 As an example. Other examples may be related to Figure 2 Different than described.

[0066] The deployment of a communication system such as a 5G NR system can be arranged in a variety of ways through various components or constituent parts. In a 5GNR system or network, a network node, a network entity, a mobile element of a network, a RAN node, a core network node, a network element, a base station or a network device can be implemented in an aggregated or decomposed architecture. For example, a base station (such as a Node B (NB), an evolved NB (eNB), an NR BS, a 5G NB, an access point (AP), a TRP or a cell, and other examples), or one or more units (or one or more components) performing base station functions can be implemented as an aggregated base station (also called an independent base station or an entire base station) or a decomposed base station. A "network entity" or a "network node" may refer to a decomposed base station, or one or more units of a decomposed base station (e.g., one or more CUs, one or more DUs, one or more RUs, or a combination thereof).

[0067] An aggregated base station (e.g., an aggregated network node) can be configured to utilize a radio protocol stack that is physically or logically integrated within a single RAN node (e.g., within a single device or unit). A decomposed base station (e.g., a decomposed network node) can be configured to utilize a protocol stack that is physically or logically distributed between two or more units (e.g., one or more CUs, one or more DUs, or one or more RUs). In some examples, the CU can be implemented within a network node, and one or more DUs can be co-located with the CU, or alternatively, can be geographically or virtually distributed in one or more other network nodes. The DU can be implemented to communicate with one or more RUs. Each of the CU, DU, and RU can also be implemented as a virtual unit, such as a virtual central unit (VCU), a virtual distributed unit (VDU), or a virtual radio unit (VRU), as well as other examples.

[0068] Base station type operation or network design can take into account the aggregated nature of base station functions. For example, a decomposed base station can be used in an IAB network, an open radio access network (O-RAN (e.g., a network configuration sponsored by the O-RAN Alliance)), or a virtualized radio access network (vRAN, also known as a cloud radio access network (C-RAN)) to facilitate the expansion of the communication system by separating the base station functions into one or more separately deployable units. A decomposed base station may include functions implemented across two or more units at different physical locations, as well as functions implemented virtually for at least one unit, which can achieve flexibility in network design. Individual units of the decomposed base station can be configured for wired or wireless communication with at least one other unit of the decomposed base station.

[0069] Figure 3 3 is a diagram illustrating an example decomposed base station architecture 300 according to the present disclosure. The decomposed base station architecture 300 may include a CU 310, which may communicate directly with a core network 320 via a backhaul link, or indirectly with the core network 320 through one or more decomposed control units (e.g., a near-RT RIC 325 via an E2 link, or a non-RT RIC 315 associated with a service management and orchestration (SMO) framework 305, or both). The CU 310 may communicate with one or more DUs 330 via respective mid-haul links, such as via an F1 interface. Each of the DUs 330 may communicate with one or more RUs 340 via respective fronthaul links. Each of the RUs 340 may communicate with one or more UEs 120 via respective radio frequency (RF) access links. In some implementations, a UE 120 may be served by multiple RUs 340 simultaneously.

[0070] Each of the units including CU 310, DU 330, RU 340, near-RT RIC 325, non-RT RIC 315, and SMO framework 305 may include or be coupled to one or more interfaces configured to receive or send signals, data, or information (collectively referred to as signals) via a wired or wireless transmission medium. Each of the units or an associated processor or controller that provides instructions to one or more communication interfaces of the corresponding unit may be configured to communicate with one or more other units via a transmission medium. In some examples, each of the units may include a wired interface and a wireless interface, the wired interface being configured to receive or send signals to one or more other units via a wired transmission medium, and the wireless interface may include a receiver, a transmitter, or a transceiver (such as an RF transceiver) configured to receive or send signals to one or more other units via a wireless transmission medium, or both.

[0071] In some aspects, the CU 310 may host one or more high-level control functions. Such control functions may include radio resource control (RRC) functions, packet data convergence protocol (PDCP) functions, or service data adaptation protocol (SDAP) functions, as well as other examples. Each control function may be implemented using an interface configured to transmit signals to other control functions hosted by the CU 310. The CU 310 may be configured to process user plane functions (e.g., central unit-user plane (CU-UP) functions), control plane functions (e.g., central unit-control plane (CU-CP) functions), or a combination thereof. In some implementations, the CU 310 may be logically divided into one or more CU-UP units and one or more CU-CP units. The CU-UP unit may communicate bidirectionally with the CU-CP unit via an interface (e.g., an E1 interface when implemented in an O-RAN configuration). The CU 310 may be implemented to communicate with the DU 330 as needed for network control and signaling.

[0072] Each DU 330 may correspond to a logical unit including one or more base station functions to control the operation of one or more RUs 340. In some aspects, the DU 330 may host one or more of a radio link control (RLC) layer, a MAC layer, and one or more high physical (PHY) layers, at least in part according to a functional partition (e.g., a functional partition defined by 3GPP). In some aspects, one or more high PHY layers may be implemented by one or more modules for forward error correction (FEC) encoding and decoding, scrambling, modulation and demodulation, and other examples. In some aspects, the DU 330 may also host one or more low PHY layers, for example, by one or more modules for fast Fourier transform (FFT), inverse FFT (iFFT), digital beamforming, or physical random access channel (PRACH) extraction and filtering, and other examples. Each layer (which may also be referred to as a module) may be implemented using an interface configured to transmit signals with other layers (and modules) hosted by the DU 330 or with a control function hosted by the CU 310.

[0073] Each RU 340 may implement lower layer functions. In some deployments, based on a functional partition (e.g., a functional partition defined by 3GPP), such as a lower layer functional partition, a RU 340 controlled by a DU 330 may correspond to a logical node that hosts RF processing functions or low PHY layer functions (e.g., performing FFT, performing iFFT, digital beamforming, or PRACH extraction and filtering, among other examples). In such an architecture, each RU 340 may be operated to handle over-the-air (OTA) communications with one or more UEs 120. In some implementations, real-time and non-real-time aspects of control and user plane communications with the RU 340 may be controlled by the corresponding DU 330. In some scenarios, this configuration may enable each DU 330 and CU 310 to be implemented in a cloud-based RAN architecture (e.g., a vRAN architecture).

[0074] The SMO framework 305 may be configured to support RAN deployment and provisioning of non-virtualized and virtualized network elements. For non-virtualized network elements, the SMO framework 305 may be configured to support deployment of dedicated physical resources for RAN coverage requirements, which may be managed via an operation and maintenance interface (such as an O1 interface). For virtualized network elements, the SMO framework 305 may be configured to interact with a cloud computing platform (e.g., an open cloud (O-Cloud) platform 390) via a cloud computing platform interface (e.g., an O2 interface) to perform network element lifecycle management (e.g., instantiating virtualized network elements). Such virtualized network elements may include, but are not limited to, CU 310, DU 330, RU 340, non-RT RIC 315, and near-RT RIC 325. In some implementations, the SMO framework 305 may communicate with hardware aspects of the 4G RAN, such as an open eNB (O-eNB) 311, via an O1 interface. Additionally, in some implementations, the SMO framework 305 can communicate directly with each of the one or more RUs 340 via a corresponding O1 interface. The SMO framework 305 can also include a non-RT RIC 315 configured to support the functionality of the SMO framework 305.

[0075] The non-RT RIC 315 may be configured to include logic functions that implement non-real-time control and optimization of RAN elements and resources, artificial intelligence / machine learning (AI / ML) workflows including model training and updating, or policy-based guidance of applications / features in the near-RT RIC 325. The non-RT RIC 315 may be coupled to or in communication with the near-RT RIC 325 (e.g., via an A1 interface). The near-RT RIC 325 may be configured to include logic functions that enable near-real-time control and optimization of RAN elements and resources through data collection and actions via an interface that connects one or more CUs 310, one or more DUs 330, or both, and O-eNBs to the near-RT RIC 325 (e.g., via an E2 interface).

[0076] In some implementations, in order to generate an AI / ML model to be deployed in the near-RT RIC 325, the non-RT RIC 315 may receive parameters or external enrichment information from an external server. Such information may be used by the near-RT RIC 325 and may be received from a non-network data source or from a network function at the SMO framework 305 or the non-RT RIC 315. In some examples, the non-RT RIC 315 or the near-RT RIC 325 may be configured to adjust RAN behavior or performance. For example, the non-RT RIC 315 may monitor long-term trends and patterns of performance and employ AI / ML models to perform corrective actions through the SMO framework 305 (e.g., via reconfiguration of the O1 interface) or via the creation of RAN management policies (e.g., A1 interface policies).

[0077] As mentioned above, providing Figure 3 As an example. Other examples may be related to Figure 3 Different than described.

[0078] Figure 4 4 is a diagram illustrating examples 400, 410, and 420 of a CSI-RS beam management process according to the present disclosure. Figure 4 As shown, examples 400, 410, and 420 include UE 120 in a wireless network (e.g., wireless network 100) communicating with network node 110. However, Figure 4 The devices shown are provided as examples, and the wireless network may support communication and beam management between other devices (e.g., between UE 120 and network node 110 or transmission reception point (TRP), between mobile terminal nodes and control nodes, between integrated access and backhaul (IAB) child nodes and IAB parent nodes, and / or between scheduled nodes and scheduling nodes). In some aspects, UE 120 and network node 110 may be in a connected state (e.g., RRC connected state).

[0079] like Figure 4 As shown, example 400 may include a network node 110 (e.g., one or more network node devices such as RU, DU, and / or CU, among other examples) and a UE 120 communicating to perform beam management using CSI-RS. Example 400 depicts a first beam management process (e.g., P1 CSI-RS beam management). The first beam management process may be referred to as a beam selection process, an initial beam acquisition process, a beam scanning process, a cell search process, and / or a beam search process. Figure 4As shown in example 400, the CSI-RS may be configured to be sent from the network node 110 to the UE 120. The CSI-RS may be configured to be periodic (e.g., using RRC signaling), semi-persistent (e.g., using medium access control (MAC) control element (MAC-CE) signaling), and / or aperiodic (e.g., using downlink control information (DCI)).

[0080] The first beam management process may include the network node 110 performing beam scanning on multiple transmit (Tx) beams. The network node 110 may transmit a CSI-RS using each transmit beam used for beam management. In order to enable the UE 120 to perform receive (Rx) beam scanning, the network node may transmit (e.g., repeat) each CSI-RS multiple times within the same RS resource set using a transmit beam, so that the UE 120 may scan the receive beams through multiple transmission instances. For example, if the network node 110 has a set of N transmit beams and the UE 120 has a set of M receive beams, the CSI-RS may be transmitted M times on each of the N transmit beams, so that the UE 120 may receive M CSI-RS instances per transmit beam. In other words, for each transmit beam of the network node 110, the UE 120 may perform beam scanning through the receive beam of the UE 120. Thus, the first beam management process may enable UE 120 to measure CSI-RS on different transmit beams using different receive beams to support selection of a network node 110 transmit beam / UE 120 receive beam pair. UE 120 may report the measurements to network node 110 to enable network node 110 to select one or more beam pairs for communication between network node 110 and UE 120. Although example 400 has been described in conjunction with CSI-RS, the first beam management process may also use synchronization signal blocks (SSBs) for beam management in a manner similar to that described above.

[0081] like Figure 4 As shown, example 410 may include network node 110 and UE 120 communicating to perform beam management using CSI-RS. Example 410 depicts a second beam management procedure (e.g., P2 CSI-RS beam management). The second beam management procedure may be referred to as a beam refinement procedure, a network node beam refinement procedure, a TRP beam refinement procedure, and / or a transmit beam refinement procedure. Figure 4As shown in example 410, the CSI-RS may be configured to be transmitted from the network node 110 to the UE 120. The CSI-RS may be configured to be non-periodic (e.g., using DCI). The second beam management process may include the network node 110 performing beam scanning through one or more transmit beams. The one or more transmit beams may be a subset of all transmit beams associated with the network node 110 (e.g., determined at least in part based on measurements reported by the UE 120 in conjunction with the first beam management process). The network node 110 may transmit the CSI-RS using each of the one or more transmit beams for beam management. The UE 120 may measure each CSI-RS using a single (e.g., identical) receive beam (e.g., determined at least in part based on measurements performed in conjunction with the first beam management process). The second beam management process may enable the network node 110 to select the best transmit beam based at least in part on measurements of the CSI-RS reported by the UE 120 (e.g., measured by the UE 120 using a single receive beam).

[0082] like Figure 4 As shown, example 420 depicts a third beam management process (e.g., P3 CSI-RS beam management). The third beam management process may be referred to as a beam refinement process, a UE beam refinement process, and / or a receive beam refinement process. Figure 4 As shown in example 420, one or more CSI-RS may be configured to be sent from the network node 110 to the UE 120. The CSI-RS may be configured to be non-periodic (e.g., using DCI). The third beam management process may include the network node 110 sending the one or more CSI-RS using a single transmit beam (e.g., determined at least in part based on measurements reported by the UE 120 in conjunction with the first beam management process and / or the second beam management process). In order to enable the UE 120 to perform receive beam scanning, the network node may use the transmit beam to send (e.g., repeat) the CSI-RS multiple times within the same set of RS resources, so that the UE 120 can scan one or more receive beams in multiple transmission instances. The one or more receive beams may be a subset of all receive beams associated with the UE 120 (e.g., determined at least in part based on measurements performed in conjunction with the first beam management process and / or the second beam management process). The third beam management procedure may enable the network node 110 and / or the UE 120 to select the best receive beam based at least in part on reported measurements received from the UE 120 (eg, measurements of the CSI-RS of the transmit beam using one or more receive beams).

[0083] The above description of CSI-RS measurements relates to beam management procedures using CSI-RS. CSI-RS may also be used for other purposes such as CSI reporting (wherein the UE provides CSI reports to the network based at least in part on measurements of the CSI-RS), mobility (wherein the UE is triggered to report measurements that trigger UE handover), radio link failure detection, interference measurements, and synchronization.

[0084] CSI-RS can be sent using multiple antenna ports. For example, different physical antennas of a transmitter can send information via different channels (wherein, in this context, a channel represents a signal path and propagation characteristics encountered by a signal sent or received by a physical antenna). Such information can be transmitted via a logical antenna port, which can represent a certain combination of physical antennas and / or channels. In some cases, a transmitter or receiver may not know the channel associated with a physical antenna and can operate based only on the knowledge of the channel associated with the antenna port, as defined below. Antenna ports can be defined so that the channel for transmitting a symbol on one antenna port can be inferred from the channel for transmitting another symbol on the same antenna port. Weighting factors can be applied to channels associated with a group of antennas to improve signal power and / or signal quality at one or more receivers. Applying such weighting factors to channel transmission can be referred to as precoding, and "precoder" can refer to a specific set of weighting factors applied to a group of channels. CSI-RS is configured with multiple CSI-RS ports. As used herein, "CSI-RS port" refers to an antenna port for CSI-RS transmission or reception. For example, a higher layer (e.g., RRC) parameter may indicate the number of CSI-RS ports configured for CSI-RS, such as the nrofPorts parameter in the CSI-RS-ResourceMapping information element (IE). In some aspects described herein, a network node may increase or decrease the number of CSI-RS ports used for CSI-RS transmission, such as for energy conservation purposes. The techniques described herein provide adaptation to the maximum number of MIMO layers based at least in part on a change in the number of CSI-RS ports used for CSI-RS transmission (as well as other examples).

[0085] As mentioned above, Figure 4 is provided as an example of a beam management process. Other examples of beam management processes may be related to Figure 4 For example, UE 120 and network node 110 may perform the third beam management procedure before performing the second beam management procedure, and / or UE 120 and network node 110 may perform a similar beam management procedure to select a UE transmit beam.

[0086] Figure 5is a diagram illustrating an example 500 of dynamic network-side antenna adaptation according to the present disclosure.

[0087] Energy conservation and / or energy efficiency measures are expected to become increasingly important in wireless network operations for a variety of reasons, including mitigating climate change and reducing network costs. For example, while NR generally offers significant improvements in energy efficiency per gigabyte over previous generations (e.g., LTE), the adoption of new NR use cases and / or millimeter wave frequencies requires more network sites and more network antennas, which may result in more efficient cellular networks, but with higher energy requirements and / or produce more emissions than previous generations due to increased traffic. In addition, energy accounts for a significant portion of the cost of operating a cellular network. For example, according to some estimates, energy costs account for nearly 23% of the total cost of operating a cellular network, of which sales, general, and administrative (SG&A) expenses and other costs account for approximately 75%, while more than 90% of network operating costs are spent on energy (e.g., fuel and electricity consumption). Most of the energy consumption and / or energy costs are related to powering the radio access network (RAN), which accounts for approximately 50% of the energy consumed by wireless networks, with data centers and fiber optic transmission accounting for smaller shares. Therefore, measures to improve energy conservation and / or energy efficiency in wireless networks are important factors that can drive the adoption and / or expansion of cellular networks.

[0088] One approach to improving energy efficiency in the RAN may be to use dynamic antenna adaptation in base stations that communicate using massive MIMO technology, which tends to consume a lot of power. For example, in an LTE network, a base station that supports massive MIMO technology may communicate using a baseband unit (BBU) that processes baseband signals and communicates with the core network through a physical interface and a remote radio unit (RRU) that performs transmit and receive radio frequency (RF) functions. In an LTE network, the per-cell power consumption (e.g., in watts) of the RRU is slightly larger than that of the BBU, and the per-cell power consumption does not vary significantly with cell load. However, in an NR network, a base station that supports massive MIMO technology may communicate using a BBU and an active antenna unit (AAU), which consumes significantly more power than the BBU and RRU in an LTE base station (e.g., because NR operates at a higher data rate and / or a higher bandwidth than LTE). For example, the BBU and AAU in an NR base station consume 2.4 times the power of the BBU and RRU in an LTE base station when the cell load is low (e.g., 0%), 2.6 times the power of the BBU and RRU in an LTE base station when the cell load is medium (e.g., 50%), or 3 times the power of the BBU and RRU in an LTE base station when the cell load is high (e.g., 100%), where "cell load" generally refers to the proportion of frequency resources being used within a carrier at a given time. In addition, in an NR base station, the AAU generally consumes more power than the BBU, and the proportion of power consumption accounted for by the AAU increases as the cell load increases (e.g., because the BBU has a relatively static power consumption regardless of the cell load). Therefore, in an NR base station supporting massive MIMO technology, the AAU represents the most power-consuming component.

[0089] Therefore, if Figure 5 As shown, and indicated by reference numeral 510, a base station supporting massive MIMO communication may implement dynamic antenna adaptation based on current and / or predicted cell loads to improve energy efficiency. For example, to implement massive MIMO communication, a base station may typically need to have multiple co-located antenna panels, each antenna panel including multiple antenna ports. For example, in Figure 5 , reference numeral 520 depicts an example antenna panel including four (4) sub-panels, each sub-panel including a number of antenna ports (shown as gray and black intersecting lines), each antenna port mapping to one or more physical antennas, wherein, Figure 5Each diagonal line in corresponds to one (1) antenna port. Typically, each antenna panel is equipped with various power amplifiers and antenna subsystems that consume a large amount of power. Therefore, in order to save power or otherwise utilize energy more efficiently, the base station can dynamically adjust the antenna configuration based on the current and / or predicted cell load. For example, when the cell load is high, the base station can turn on all (or most) antenna panels, sub-panels and / or ports to increase capacity, and when the cell load is low, the base station can turn off some antenna panels, sub-panels and / or ports to reduce energy consumption. Dynamically adjusting the antenna configuration of the base station may affect the MIMO communication performance of the network node because the number of MIMO layers that a communication link can support is generally related to the number of antenna ports used to communicate on the communication link (e.g., a larger number of antenna ports can support a larger number of MIMO layers). The technology described herein provides adaptation of the maximum number of MIMO layers based at least in part on dynamic antenna adaptation, such as based at least in part on the number of CSI-RS ports active at the network node (and other examples).

[0090] As mentioned above, providing Figure 5 As an example. Other examples may be related to Figure 5 Described differently.

[0091] Figure 6 An example logical architecture of a distributed RAN 600 according to the present disclosure is shown.

[0092] The 5G access node 605 may include an access node controller 610. The access node controller 610 may be a central unit (CU) of the distributed RAN 600. In some aspects, a backhaul interface to a 5G core network 615 may terminate at the access node controller 610. The 5G core network 615 may include a 5G control plane component 620 and a 5G user plane component 625 (e.g., a 5G gateway), and a backhaul interface for one or both of the 5G control plane and the 5G user plane may terminate at the access node controller 610. Additionally or alternatively, a backhaul interface to one or more neighbor access nodes 630 (e.g., another 5G access node 605 and / or an LTE access node) may terminate at the access node controller 610.

[0093] The access node controller 610 may include one or more TRPs 635 and / or may communicate with one or more TRPs 635 (e.g., via an F1 control (F1-C) interface and / or an F1 user (F1-U) interface). The TRP 635 may be a distributed unit (DU) of the distributed RAN 600. In some aspects, the TRP 635 may correspond to the TRP 635 described above in conjunction with Figure 110. For example, different TRPs 635 may be included in different network nodes 110. Additionally or alternatively, multiple TRPs 635 may be included in a single network node 110. In some aspects, a network node 110 may include a CU (e.g., an access node controller 610) and / or one or more DUs (e.g., one or more TRPs 635). In some cases, a TRP 635 may be referred to as a unit, a panel, an antenna array, or an array.

[0094] The TRP 635 may be connected to a single access node controller 610 or to multiple access node controllers 610. In some aspects, dynamic configuration of split logic functions may exist within the architecture of the distributed RAN 600. For example, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and / or a medium access control (MAC) layer may be configured to terminate at an access node controller 610 or a TRP 635.

[0095] In some aspects, multiple TRPs 635 may transmit communications (e.g., the same communication or different communications) in the same transmission time interval (TTI) (e.g., time slot, mini-slot, subframe, or symbol) or in different TTIs using different quasi-co-location (QCL) relationships (e.g., different spatial parameters, different transmission configuration indicator (TCI) states, different precoding parameters, and / or different beamforming parameters). In some aspects, the TCI state may be used to indicate one or more QCL relationships. A TRP 635 may be configured to provide services to a UE 120 individually (e.g., using dynamic selection) or jointly (e.g., using joint transmission with one or more other TRPs 635).

[0096] As mentioned above, providing Figure 6 As an example. Other examples may be related to Figure 6 Different than described.

[0097] Figure 7 7 is a diagram illustrating an example 700 of multiple TRP (multi-TRP) communications (sometimes referred to as multi-panel communications) in accordance with the present disclosure. Figure 7 As shown, multiple TRPs 705 can communicate with the same UE 120. TRP 705 can correspond to the above combined Figure 6 Description of TRP 635.

[0098] Multiple TRPs 705 (shown as TRP A and TRP B) can communicate with the same UE 120 in a coordinated manner (e.g., using coordinated multi-point transmission) to improve reliability and / or increase throughput. The TRPs 705 can coordinate such communications via an interface between the TRPs 705 (e.g., a backhaul interface and / or an access node controller 610). When the TRPs 705 are co-located at the same network node 110 (e.g., when the TRPs 705 are different antenna arrays or panels of the same network node 110), the interface can have less latency and / or higher capacity, and when the TRPs 705 are located at different network nodes 110, the interface can have greater latency and / or lower capacity (compared to co-location). Different TRPs 705 can communicate with the UE 120 using different QCL relationships (e.g., different TCI states), different demodulation reference signal (DMRS) ports, and / or different layers (e.g., layers of multi-layer communications).

[0099] In a first multi-TRP transmission mode (e.g., Mode 1), a single physical downlink control channel (PDCCH) can be used to schedule downlink data communications for a single physical downlink shared channel (PDSCH). In this case, multiple TRPs 705 (e.g., TRP A and TRP B) can send communications to UE 120 on the same PDSCH. For example, communications can be sent using a single codeword with different spatial layers for different TRPs 705 (e.g., where one codeword is mapped to a first set of layers sent by a first TRP 705 and mapped to a second set of layers sent by a second TRP 705). As another example, communications can be sent using multiple codewords, where different codewords are sent by different TRPs 705 (e.g., using different sets of layers). In either case, different TRPs 705 can use different QCL relationships (e.g., different TCI states) for different DMRS ports corresponding to different layers. For example, the first TRP 705 may use a first QCL relationship or a first TCI state for a first set of DMRS ports corresponding to a first set of layers, and the second TRP 705 may use a second (different) QCL relationship or a second (different) TCI state for a second (different) set of DMRS ports corresponding to a second (different) set of layers. In some aspects, the TCI state in the downlink control information (DCI) (e.g., sent on the PDCCH, such as DCI format 1_0 or DCI format 1_1) may indicate a first QCL relationship (e.g., by indicating a first TCI state) and a second QCL relationship (e.g., by indicating a second TCI state). The first TCI state and the second TCI state may be indicated using a TCI field in the DCI. Typically, the TCI field may indicate a single TCI state (for single TRP transmission) or multiple TCI states (for multi-TRP transmission as discussed herein) in the multi-TRP transmission mode (e.g., mode 1).

[0100] In a second multi-TRP transmission mode (e.g., mode 2), multiple PDCCHs may be used to schedule downlink data communications for multiple corresponding PDSCHs (e.g., one PDCCH per PDSCH). In this case, the first PDCCH may schedule a first codeword to be sent by the first TRP 705, and the second PDCCH may schedule a second codeword to be sent by the second TRP 705. In addition, a first DCI (e.g., sent by the first TRP 705) may schedule a first PDSCH communication associated with a first group of DMRS ports having a first QCL relationship (e.g., indicated by a first TCI state) for the first TRP 705, and a second DCI (e.g., sent by the second TRP 705) may schedule a second PDSCH communication associated with a second group of DMRS ports having a second QCL relationship (e.g., indicated by a second TCI state) for the second TRP 705. In this case, the DCI (e.g., having DCI format 1_0 or DCI format 1_1) may indicate a corresponding TCI state of the TRP 705 corresponding to the DCI. The TCI field of the DCI indicates a corresponding TCI state (eg, the TCI field of the first DCI indicates a first TCI state, and the TCI field of the second DCI indicates a second TCI state).

[0101] The network node can dynamically convert one or more TRPs to a dormant state, such as to achieve network energy saving. For example, the network node can dynamically switch between a multi-TRP communication mode and a single TRP communication mode, such as using a multi-TRP dormant configuration or a secondary cell (SCell) dormant configuration. In some examples, TRP dormancy can be explicitly indicated. In some examples, TRP dormancy can be jointly indicated with an SCell dormancy indication. In some examples, SCell dormancy can be extended to one or more TRPs in the primary cell. For example, TRP dormancy can be indicated by an SCell dormancy indication of a TRP applied to the primary cell. TRP dormancy can provide network power savings with less signaling overhead and potential UE power usage reduction. Switching TRP to a dormant state may affect MIMO communication, because each TRP of a multi-TRP communication mode can support one or more MIMO layers of multi-layer communication. Therefore, when a TRP transitions to a dormant state, the number of MIMO layers that can be supported in a multi-TRP communication mode can be reduced. Some of the techniques described herein enable adaptation of the maximum number of MIMO layers based at least in part on the transition of a TRP to a dormant state.

[0102] As mentioned above, providing Figure 7 As an example. Other examples may be related to Figure 7 Described differently.

[0103] Figure 88 is a diagram illustrating an example 800 of MIMO communication according to the present disclosure. As shown, the example 800 includes a transmitter 810 (e.g., a network node 110, a UE 120, a TRP, etc.) and a receiver 820 (e.g., a network node 110, a UE 120, a TRP, etc.). A channel between the transmitter 810 and the receiver 820 is illustrated by reference numeral 830. In this context, the channel is a propagation channel between the transmitter 810 and the receiver 820.

[0104] The MIMO configuration benefits from multiple antenna elements at the transmitter 810 and multiple antenna elements at the receiver 820. The transmitter can transmit into the channel simultaneously from multiple antenna elements, and the receiver can receive simultaneously on multiple antenna elements. The number of antenna elements at the transmitter 810 and the number of antenna elements at the receiver 820 can be the same number, or can be different numbers. MIMO provides diversity gain, array gain, and spatial multiplexing gain.

[0105] MIMO communications can carry multiple parallel data streams. The data streams of MIMO communications are called MIMO layers (or simply "layers"). MIMO communications carrying 2 parallel data streams have 2 MIMO layers. Using information about the channel state (which can be derived from CSI-RS, demodulation reference signals, etc.), the receiver 820 can reconstruct the MIMO layers of the MIMO communication. The receiver 820 can be configured with a maximum number of MIMO layers, which indicates the maximum number of MIMO layers that the transmitter 810 can use.

[0106] In some deployments, the maximum number of MIMO layers is RRC-configured for each cell for downlink transmission (e.g., using the maxMIMO-Layers parameter in the PDSCH-ServingCellConfig IE). In some deployments, the maximum number of MIMO layers is RRC-configured for each downlink bandwidth part (BWP) (e.g., using the maxMIMO-Layers parameter in the PDSCH-Config IE, where a BWP is a configured set of frequency resources that can be activated or deactivated via dynamic or semi-static signaling). The per-BWP configuration of the maximum number of MIMO layers can allow the receiver 820 to operate with a reduced number of antennas and / or receive chains, which can save power in certain scenarios (e.g., low traffic). For example, the network can configure the receiver 820 with two BWPs for different scenarios. The first BWP (e.g., a wideband BWP) can have a larger maximum number of MIMO layers (e.g., 4) suitable for high data rates, and the second BWP (e.g., a narrowband BWP) can have a smaller maximum number of MIMO layers (e.g., 2) suitable for low traffic and energy saving. The receiver 820 may perform BWP switching between these BWPs in different scenarios.

[0107] The maximum number of MIMO layers can also be configured for uplink communication. In this example, the transmitter 810 can be a UE and the receiver 820 can be a network node. Uplink communication may include, for example, codebook-based physical uplink shared channel (PUSCH) communication or non-codebook-based (NCB) PUSCH transmission. Codebook-based PUSCH communication can use a precoder matrix specified by the codebook. NCB PUSCH communication can use a precoder matrix derived by the transmitter 810 at least in part based on a sounding reference signal (SRS) resource indicator. In some deployments, the maxRank field in the pusch-Configs IE can be used to support the configuration of the maximum number of MIMO layers for each BWP for codebook-based PUSCH transmission. However, for NCB PUSCH transmission, the maxMIMO-Layers field of the PUSCH-ServingCellConfig IE can be used to configure the maximum number of MIMO layers at the per-cell level.

[0108] For NCB PUSCH transmissions, per-BWP MIMO configuration may be implicitly implemented. For example, for NCB uplink transmissions, when multiple SRS resources are configured, the number of uplink ports from which to transmit is determined based at least in part on one or more indicated SRS resource indicators (SRIs). The SRI indication depends on the parameter L max (which is defined by maxMIMO-Layers in PUSCH-ServingCellConfig, or if not provided, by UE capabilities) and the number of SRS resources in the associated SRS resource set (N SRS Each BWP can be allowed to have a number of SRS resources using "nonCodeBook" (N SRS ), which implicitly limits the maximum scheduled uplink rank. “Rank” is a value indicating the number of MIMO layers. Therefore, for a configuration of N SRS For a BWP of =2, the maximum uplink rank that can be scheduled is limited to 2.

[0109] As described above, some deployments support a per-downlink BWP configuration of the maximum number of downlink MIMO layers for UE power saving. The per-BWP maxMIMO-layers configuration may allow the UE to operate with a reduced number of antennas and / or receive chains and save power in certain scenarios (e.g., low traffic). BWP switching facilitates dynamic switching between different configurations of the maximum number of downlink MIMO layers.

[0110] As described above, the network may support dynamic antenna adaptation, for example, to achieve network energy conservation. As used herein, "dynamic antenna adaptation" may refer to deactivating one or more antenna elements, ports, sub-panels, or panels (e.g., in conjunction with Figure 5 ), or refers to the transition of one or more TRPs to a dormant state (such as in combination with Figure 7 Dynamic antenna adaptation may allow the network to shut down some antenna ports or TRPs in an efficient and dynamic manner when there is no or low user traffic (which is itself dynamic).

[0111] As the number of transmit antenna ports or the number of TRPs decreases (e.g., due to dynamic antenna adaptation), the maximum number of MIMO layers that can be supported on the communication link between the network node and the UE may decrease. In some deployments, the network node may reduce the maximum number of MIMO layers via dynamic BWP switching (between BWPs with different configured maximum numbers of MIMO layers). However, if the network node and / or UE supports only one BWP, reducing the maximum number of MIMO layers via BWP switching may not work. In addition, frequent BWP switching at the UE may be undesirable at the UE, for example due to the overhead associated with BWP switching and increased scheduling complexity.

[0112] Some techniques described herein enable adaptation of the maximum number of MIMO layers, e.g., in association with dynamic antenna adaptation at a network node. In some examples, adaptation of the maximum number of MIMO layers can be independent of BWP switching. For example, adaptation of the maximum number of MIMO layers can be implemented without the UE performing a BWP switch (e.g., when the UE remains on the same BWP). In some aspects, adaptation of the maximum number of MIMO layers is based at least in part on the number of CSI-RS ports associated with the network node (e.g., in conjunction with a BWP switch). Fig. 9 In some aspects, the adaptation of the maximum number of MIMO layers is based at least in part on a transition of a TRP associated with a network node to or from a dormant state (e.g., in conjunction with Fig.10 In this way, adaptation of the maximum number of MIMO layers is enabled, for example in combination with dynamic antenna adaptation. In some aspects, adaptation of the maximum number of MIMO layers is enabled without BWP switching, which reduces the overhead associated with BWP switching and enables adaptation of the maximum number of MIMO layers for UEs and / or network nodes that only support a single BWP. In some aspects, adaptation of the maximum number of MIMO layers is enabled without RRC reconfiguration, which reduces the overhead and delay associated with adapting the maximum number of MIMO layers.

[0113] As mentioned above, providing Figure 8As an example. Other examples may be related to Figure 8 Described differently.

[0114] Fig. 9 8 is a diagram illustrating an example 900 of adapting a maximum number of MIMO layers based at least in part on a number of CSI-RS ports associated with a network node according to the present disclosure. As shown, example 900 includes a UE (e.g., UE 120, transmitter 810, receiver 820) and a network node (e.g., network node 110, CU 310, DU 330, RU 340, Figure 5 network node, 5G access node 605, access node controller (ANC) 610, one or more TRPs 635, one or more TRPs 705, transmitter 810, receiver 820, or a combination thereof).

[0115] As shown in reference numeral 910, in some aspects, the network node may send and the UE may receive configuration information (e.g., via RRC or medium access control (MAC) signaling). In some aspects, the configuration information may indicate a mapping between the number of CSI-RS ports and the maximum number of MIMO layers. For example, for a given number of CSI-RS ports associated with a network node, the mapping may indicate the maximum number of MIMO layers or a rule for determining the maximum number of MIMO layers. In some aspects, the mapping may be fixed. In some aspects, the mapping may be indicated by a table. Two examples of such tables are provided below. In the following examples, "M" indicates the UE capability of the maximum number of MIMO layers. For example, the UE may have the capability of the maximum number of MIMO layers, and the UE capability information indicating the maximum number of MIMO layers may be signaled. The maximum number of MIMO layers supported by the UE may be related to a variety of factors, such as the number of antennas of the UE, the number of transmit chains of the UE, the processing capability of the UE, etc. These tables are examples only, and different mappings between the number of CSI-RS ports and the maximum number of MIMO layers may be used without departing from the scope of the present disclosure.

[0116] Number of CSI-RS ports Maximum MIMO Layer 32 M (capability of each UE) 16 M-1 8 M-2 4 M-3 2 1

[0117] Example 1

[0118] Number of CSI-RS ports Maximum MIMO Layer 32 M (capability of each UE) 16 M / 2 8 M / 2 4 M / 4 2 1

[0119] Example 2

[0120] Thus, a first number of CSI-RS ports (e.g., 32 CSI-RS ports) is mapped to a first number of MIMO layers (e.g., M layers), and a second number of CSI-RS ports (e.g., 16 CSI-RS ports) is mapped to a second number of MIMO layers (e.g., M-1 layers or M / 2 layers), wherein the first number of MIMO layers is greater than the second number of MIMO layers and the first number of CSI-RS ports is greater than the second number of CSI-RS ports. The UE may receive information indicating (e.g., updating) the active number of CSI-RS ports from the first number of CSI-RS ports to the second number of CSI-RS ports (as described below), and may identify the maximum number of MIMO layers as the second number of MIMO layers based at least in part on the information. In some aspects, the mapping may be used to determine an adjustment to the maximum number of MIMO layers. For example, the UE may be configured with an initial maximum number of MIMO layers, or the initial maximum number of MIMO layers may be determined based on the configuration of the UE. When receiving an indication to update or indicate the active number of CSI-RS ports of a network node, the UE may use the mapping to identify the maximum number of MIMO layers.

[0121] As indicated by reference numeral 920, in some aspects, a network node may send, and a UE may receive, information indicating a number of CSI-RS ports associated with the network node (e.g., an RRC parameter, dynamic signaling, or another form of signaling). The number of CSI-RS ports may be associated with the network node based at least in part on the number of CSI-RS ports that are active on the network node (e.g., for CSI-RS transmission). For example, the network node may provide information indicating the number of CSI-RS ports, such as an explicit indication of the number of CSI-RS ports, an adjustment to the number of CSI-RS ports, etc. In some aspects, the network node may send information indicating the number of CSI-RS ports based at least in part on the modification to the number of CSI-RS ports. For example, the network node may perform dynamic antenna adaptation, thereby changing the number of CSI-RS ports associated with the network node (because the number of active antenna ports changes during the dynamic antenna adaptation, thereby changing the number of CSI-RS ports that the network node can support), and may send information indicating the number of CSI-RS ports based at least in part on the dynamic antenna adaptation. In some aspects, the UE may identify the maximum number of MIMO layers based at least in part on the number of CSI-RS ports and the transition of the TRP to or from the sleep state. For example, the UE may receive an indication of the transition and the number of CSI-RS ports active after the transition, and may identify the maximum number of MIMO layers based on the number of CSI-RS ports and the receipt of the indication of the transition (as described above).

[0122] As indicated by reference numeral 930, the UE (and optionally the network node) may identify a maximum number of MIMO layers for communication based at least in part on a number of CSI-RS ports associated with the network node. For example, the UE may identify the maximum number of MIMO layers using the mapping described in conjunction with reference numeral 910. For example, if the indication of the number of CSI-RS ports indicates 8 CSI-RS ports, the UE may identify the maximum number of MIMO layers as M-2 or M / 2.

[0123] In some aspects, the UE and / or network node may perform adaptation of the maximum number of MIMO layers (e.g., the maximum number of MIMO layers may be identified) at a per-BWP granularity or a per-cell granularity, where "cell" in this context refers to a TRP or a component carrier. For example, if a per-bandwidth portion configuration of the maximum number of MIMO layers is configured, the maximum number of MIMO layers per BWP may be identified based at least in part on the per-bandwidth portion configuration of the maximum number of MIMO layers. This may be referred to as per-BWP granularity adaptation of the maximum number of MIMO layers. If a per-BWP configuration of the maximum number of MIMO layers is configured, the maximum number of MIMO layers may be configured for the BWP, and different maximum numbers of MIMO layers may be configured for different BWPs (e.g., using an RRC parameter indicating the maximum number of MIMO layers for the BWP). As another example, if a per-bandwidth portion configuration of the maximum number of MIMO layers is not configured, the maximum number of MIMO layers per cell may be identified based at least in part on the per-bandwidth portion configuration of the maximum number of MIMO layers not being configured. This may be referred to as per-cell granularity adaptation of the maximum number of MIMO layers. If a per-cell configuration of the maximum number of MIMO layers is configured, the maximum number of MIMO layers can be configured for a cell (e.g., carrier, TRP), and different maximum numbers of MIMO layers can be configured for different cells (e.g., using an RRC parameter indicating the maximum number of MIMO layers for the cell). In some aspects, if a per-bandwidth portion configuration of the maximum number of MIMO layers is configured, the maximum number of MIMO layers is identified based at least in part on the maximum number of MIMO layers configured for the bandwidth portion, and if a per-bandwidth portion configuration of the maximum number of MIMO layers is not configured, the maximum number of MIMO layers is identified based at least in part on the maximum number of MIMO layers configured for the cell. Therefore, the adaptation of the maximum number of MIMO applies to the per-BWP configuration of maxMIMO-layers or the maxRank field of pusch-Configs (if configured), and otherwise applies to the per-cell maxMIMO-layers configuration (if the per-BWP configuration is not configured).

[0124] As indicated by reference numeral 940, the UE and the network node may perform communications based on the maximum number of MIMO layers. For example, the UE may send uplink communications (e.g., PUSCH communications) using up to the maximum number of MIMO layers, and the network node may receive uplink communications using up to the maximum number of MIMO layers. As another example, the network node may send or configure downlink communications (e.g., PDSCH communications) using up to the maximum number of MIMO layers, and the UE may receive downlink communications using up to the maximum number of MIMO layers. In this way, the maximum number of MIMO layers may be adapted based at least in part on the number of CSI-RS ports (e.g., the number of antenna ports) active at the network node, e.g., without switching the BWP or RRC to reconfigure the network node UE.

[0125] As mentioned above, providing Fig. 9 As an example. Other examples may be related to Fig. 9 Described differently.

[0126] Fig.10 1 is a diagram illustrating an example 1000 of adapting a maximum number of MIMO layers based at least in part on a transition to or from a sleep state based on a TRP in accordance with the present disclosure. As shown, example 1000 includes a UE (e.g., UE 120, transmitter 810, receiver 820) and a network node (e.g., network node 110, CU 310, DU 330, RU 340, Figure 5 605, ANC 610, one or more TRPs 635, one or more TRPs 705, transmitter 810, receiver 820, or a combination thereof). A network node may be associated with two or more TRPs. Dashed arrows indicate optional steps.

[0127] As indicated by reference numeral 1010, in some aspects, the network node may send and the UE may receive configuration information (such as via RRC or MAC signaling). In some aspects, the configuration information may include an indication of a scaling factor (e.g., scaling factor K) associated with identifying the maximum number of MIMO layers. The UE may continue to use the unscaled maximum number of MIMO layers until an indication is received that a TRP associated with the network node transitions to a dormant state. For example, the UE and / or the network node may identify the maximum number of MIMO layers based at least in part on a transition from a TRP associated with the network node to a dormant state or from a dormant state by applying the scaling factor to the previous maximum number of MIMO layers. In this example, if the previous maximum number of MIMO layers is 4 and the scaling factor is 2, the UE and / or the network node may identify the maximum number of MIMO layers based at least in part on a transition from a TRP associated with the network node to a dormant state or from a dormant state, which is 4 / 2=2. For another example, the UE and / or the network node may identify the maximum number of MIMO layers by applying the scaling factor to the previous maximum number of MIMO layers based at least in part on the transition of the TRP associated with the network node to the active (non-dormant) state. In this example, if the previous maximum number of MIMO layers is 2 and the scaling factor is 2, the UE and / or the network node may identify the maximum number of MIMO layers based at least in part on the transition of the TRP associated with the network node to the active state, which is 2*2=4.

[0128] As indicated by reference numeral 1020, in some aspects, a network node may send and a UE may receive information indicating a transition of a TRP to a sleep state or a non-sleep state. For example, the information may include or be associated with an SCell sleep or activation indication, or may not be associated with an SCell sleep or activation indication. In some aspects, the information may include a TRP sleep or activation indication, which may be UE-specific or group-specific (e.g., DCI, wake-up signal, etc.). "Group-specific" signaling is signaling for a group of recipients, such as a group of UEs associated with a group identifier, a group of UEs in a specific coverage area, etc. The UE and / or the network node may identify the maximum number of MIMO layers based at least in part on this information, as described below.

[0129] As shown in reference numeral 1030, the UE may identify the maximum number of MIMO layers for communication based at least in part on a transition of a TRP associated with a network node to a dormant state or an active state. In some aspects, the UE and / or the network node may apply the scaling factor described in conjunction with reference numeral 1010 in order to identify the maximum number of MIMO layers.

[0130] In some aspects, the UE and / or the network node may identify the maximum number of MIMO layers as the maximum number of MIMO layers of a non-dormant TRP associated with the network node. For example, a network node may be associated with two TRPs: a TRP associated with a dormant state and a non-dormant TRP. In this example, the TRP associated with the dormant state is associated with a first maximum number of MIMO layers, and the non-dormant TRP is associated with a second maximum number of MIMO layers. The UE and the network node may identify the maximum number of MIMO layers for communication as the second maximum number of MIMO layers (e.g., based at least in part on information indicating a transition of the TRP to the dormant state). Therefore, the UE and / or the network node may identify the maximum number of MIMO layers based at least in part on the maximum number of MIMO layers associated with an active (e.g., non-dormant) TRP. For example, for a spatial division multiplexing (SDM) mTRP scheme with rank 4 PDSCH transmission via rank 2 (TRP0) + rank 2 (TRP1) or rank 3 (TRP0) + rank 1 (TRP1), if TRP 1 is in a dormant state, the UE may receive PDSCH and / or transmit PUSCH using the rank associated with TRP0 (2 for the 2+2 case or 3 for the 3+1 case). If the network node is associated with more than two TRPs, the UE may identify the maximum number of MIMO layers for communication as the sum of the maximum number of MIMO layers of one or more non-dormant TRPs associated with the network node.

[0131] In some aspects, the UE and / or the network node may perform adaptation of the maximum number of MIMO layers (e.g., may identify the maximum number of MIMO layers) at a per-BWP granularity or a per-cell granularity. For example, if a per-bandwidth portion configuration of the maximum number of MIMO layers is configured, the maximum number of MIMO layers for each BWP may be identified based at least in part on the configuration of the per-bandwidth portion configuration of the maximum number of MIMO layers. As another example, if the per-bandwidth portion configuration of the maximum number of MIMO layers is not configured, the maximum number of MIMO layers for each cell may be identified based at least in part on the fact that the per-bandwidth portion configuration of the maximum number of MIMO layers is not configured. In some aspects, if a per-bandwidth portion configuration of the maximum number of MIMO layers is configured, the maximum number of MIMO layers is identified based at least in part on the maximum number of MIMO layers configured for the bandwidth portion, and if the per-bandwidth portion configuration of the maximum number of MIMO layers is not configured, the maximum number of MIMO layers is identified based at least in part on the maximum number of MIMO layers configured for the cell. Therefore, the maximum number of MIMO adaptations applies to the per-BWP configuration of maxMIMO-layers (if configured), and otherwise applies to the per-cell maxMIMO-layers configuration (if the per-BWP configuration is not configured).

[0132] As indicated by reference numeral 1040, the UE and the network node may perform communications based on the maximum number of MIMO layers. For example, the UE may send uplink communications (e.g., uplink PUSCH communications) using up to the maximum number of MIMO layers, and the network node may receive uplink communications using up to the maximum number of MIMO layers. As another example, the network node may send or configure downlink communications (e.g., downlink PDSCH communications) using up to the maximum number of MIMO layers, and the UE may receive downlink communications using up to the maximum number of MIMO layers. In this way, the maximum number of MIMO layers may be adapted based at least in part on the sleep state (or change in sleep state) of the TRP, e.g., without switching the BWP or RRC to reconfigure the UE.

[0133] As mentioned above, providing Fig.10 As an example. Other examples may be related to Fig.10 Described differently.

[0134] Fig.11 1 is a diagram illustrating an example process 1100, performed, for example, by a UE, according to the present disclosure. Example process 1100 is an example in which a UE (eg, UE 120, transmitter 810, receiver 820) performs operations associated with MIMO layer adaptation.

[0135] like Fig.11 As shown, in some aspects, process 1100 may include identifying a maximum number of MIMO layers for communication based at least in part on at least one of a number of CSI-RS ports associated with a network node or a transition of a TRP associated with the network node to a dormant state or from a dormant state (block 1110). For example, a UE (e.g., using Fig.13 The communication manager 140 and / or identification component 1308 depicted in the figure can identify the maximum number of MIMO layers for communication based at least in part on at least one of the number of CSI-RS ports associated with the network node or the transition of the TRP associated with the network node to a sleep state or from a sleep state, as described above.

[0136] like Fig.11 As further shown, in some aspects, process 1100 may include performing communications according to the maximum number of MIMO layers (block 1120). Fig.13 The communication manager 140 and / or the transmitting component 1304 or the receiving component 1302 depicted in FIG. 1 may perform communications according to the maximum number of MIMO layers, as described above.

[0137] Process 1100 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in connection with one or more other processes described elsewhere herein.

[0138] In a first aspect, process 1100 includes receiving information indicating a number of CSI-RS ports, wherein identifying a maximum number of MIMO layers is based at least in part on the information.

[0139] In a second aspect, alone or in combination with the first aspect, process 1100 includes receiving information indicating a transition of the TRP to a dormant state, wherein identifying a maximum number of MIMO layers is based at least in part on the information.

[0140] In a third aspect, alone or in combination with one or more of the first and second aspects, identifying the maximum number of MIMO layers further comprises identifying the maximum number of MIMO layers based on a mapping between the number of CSI-RS ports and the maximum number of MIMO layers.

[0141] In the fourth aspect, alone or in combination with one or more of the first to third aspects, the first number of CSI-RS ports is mapped to the first number of MIMO layers, and the second number of CSI-RS ports is mapped to the second number of MIMO layers, wherein the first number of MIMO layers is greater than the second number of MIMO layers, and the first number of CSI-RS ports is greater than the second number of CSI-RS ports.

[0142] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, the maximum number of MIMO layers is a second number of MIMO layers and the number of CSI-RS ports associated with the network node is a second number of CSI-RS ports, and process 1100 includes receiving information indicating the number of active CSI-RS ports to the second number of CSI-RS ports from the network node, wherein identifying the maximum number of MIMO layers is based at least in part on the information.

[0143] In a sixth aspect, alone or in combination with one or more of the first to fifth aspects, process 1100 includes receiving configuration information indicating a mapping.

[0144] In a seventh aspect, alone or in combination with one or more of the first to sixth aspects, identifying the maximum number of MIMO layers further comprises identifying the maximum number of MIMO layers as the maximum number of MIMO layers of a non-dormant TRP associated with the network node.

[0145] In the eighth aspect, alone or in combination with one or more of the first to seventh aspects, the TRP associated with the sleep state is associated with the first maximum number of MIMO layers, and the non-sleep TRP is associated with the second maximum number of MIMO layers, and the maximum number of MIMO layers used for communication is the second maximum number of MIMO layers.

[0146] In a ninth aspect, alone or in combination with one or more of the first to eighth aspects, identifying the maximum number of MIMO layers also includes: identifying the maximum number of MIMO layers by applying a scaling factor to a previous maximum number of MIMO layers based at least in part on a transition of a TRP associated with the network node to a sleep state.

[0147] In a tenth aspect, alone or in combination with one or more of the first to ninth aspects, process 1100 includes receiving an indication of a scaling factor.

[0148] In an eleventh aspect, alone or in combination with one or more of the first to tenth aspects, the maximum number of MIMO layers is configured to be identified per bandwidth part based at least in part on a per-bandwidth part configuration of the maximum number of MIMO layers.

[0149] In a twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, if the per-bandwidth portion configuration of the maximum number of MIMO layers is not configured, the maximum number of MIMO layers is identified for each cell at least in part based on the fact that the per-bandwidth portion configuration of the maximum number of MIMO layers is not configured.

[0150] In the thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, if the per-bandwidth part configuration of the maximum number of MIMO layers is configured, the maximum number of MIMO layers is identified at least in part based on the maximum number of MIMO layers configured for the bandwidth part, and if the per-bandwidth part configuration of the maximum number of MIMO layers is not configured, the maximum number of MIMO layers is identified at least in part based on the maximum number of MIMO layers configured for the cell.

[0151] although Fig.11 Example blocks of process 1100 are shown, but in some aspects process 1100 may include Fig.11 Additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in. Additionally or alternatively, two or more blocks of process 1100 may be executed in parallel.

[0152] Fig.121 is a diagram illustrating an example process 1200 performed, for example, by a network node according to the present disclosure. The example process 1200 is a diagram of an example process 1200 performed by a network node (e.g., network node 110, CU 310, DU 330, RU 340, Figure 5 An example of a network node, a 5G access node 605, an ANC 610, one or more TRPs 635, one or more TRPs 705, a transmitter 810, a receiver 820, or a combination thereof) performing operations associated with MIMO layer adaptation.

[0153] like Fig.12 As shown, in some aspects, process 1200 may include sending at least one of the following: information indicating a number of CSI-RS ports associated with a network node, or information indicating a transition of a TRP associated with the network node to or from a dormant state (block 1210). For example, a network node (e.g., using Fig.14 The communication manager 150 and / or sending component 1404 depicted in the figure may send at least one of the following: information indicating the number of CSI-RS ports associated with the network node, or information indicating a transition of a TRP associated with the network node to a sleep state or from a sleep state, as described above.

[0154] like Fig.12 As further shown, in some aspects, process 1200 may include performing communications based on a maximum number of MIMO layers, wherein the maximum number of MIMO layers is based at least in part on at least one of: a number of CSI-RS ports or a transition of a TRP to a dormant state (block 1220). Fig.14 The communication manager 150, the transmitting component 1404 and / or the receiving component 1402 depicted in the figure can perform communication based on the maximum number of MIMO layers, wherein the maximum number of MIMO layers is based at least in part on at least one of the number of CSI-RS ports or the transition of TRP to a sleep state, as described above.

[0155] Process 1200 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in connection with one or more other processes described elsewhere herein.

[0156] In a first aspect, the maximum number of MIMO layers is based at least in part on a mapping between the number of CSI-RS ports and the maximum number of MIMO layers.

[0157] In the second aspect, alone or in combination with the first aspect, the first number of CSI-RS ports is mapped to the first number of MIMO layers, and the second number of CSI-RS ports is mapped to the second number of MIMO layers, wherein the first number of MIMO layers is greater than the second number of MIMO layers, and the first number of CSI-RS ports is greater than the second number of CSI-RS ports.

[0158] In a third aspect, alone or in combination with one or more of the first and second aspects, process 1200 includes sending configuration information indicating a mapping.

[0159] In a fourth aspect, alone or in combination with one or more of the first to third aspects, the maximum number of MIMO layers is equal to the maximum number of MIMO layers of non-dormant TRPs associated with the network node.

[0160] In the fifth aspect, alone or in combination with one or more of the first to fourth aspects, the TRP associated with the sleep state is associated with the first maximum number of MIMO layers, and the non-sleep TRP is associated with the second maximum number of MIMO layers, and the maximum number of MIMO layers used for communication is the second maximum number of MIMO layers.

[0161] In a sixth aspect, alone or in combination with one or more of the first to fifth aspects, the maximum number of MIMO layers is determined by applying a scaling factor to a previous maximum number of MIMO layers based at least in part on a transition of a TRP associated with a network node to a sleep state.

[0162] In a seventh aspect, alone or in combination with one or more of the first to sixth aspects, process 1200 includes sending an indication of a scaling factor.

[0163] In an eighth aspect, alone or in combination with one or more of the first to seventh aspects, if a per-bandwidth part configuration of the maximum number of MIMO layers is configured, the maximum number of MIMO layers is identified for each bandwidth part based at least in part on the per-bandwidth part configuration of the maximum number of MIMO layers being configured.

[0164] In a ninth aspect, alone or in combination with one or more of the first to eighth aspects, if the per-bandwidth portion configuration of the maximum number of MIMO layers is not configured, the maximum number of MIMO layers is configured for each cell identification based at least in part on the per-bandwidth portion configuration of the maximum number of MIMO layers.

[0165] In the tenth aspect, alone or in combination with one or more of the first to ninth aspects, if the per-bandwidth part configuration of the maximum number of MIMO layers is configured, the maximum number of MIMO layers is identified at least in part based on the maximum number of MIMO layers configured for the bandwidth part, and if the per-bandwidth part configuration of the maximum number of MIMO layers is not configured, the maximum number of MIMO layers is identified at least in part based on the maximum number of MIMO layers configured for the cell.

[0166] although Fig.12 An example block diagram of process 1200 is shown, but in some aspects, process 1200 may include Fig.12 Additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in . Additionally or alternatively, two or more of the processes 1200 can be performed in parallel.

[0167] Fig.13 1 is a diagram of an example apparatus 1300 for wireless communication according to the present disclosure. Apparatus 1300 may be a UE, or a UE may include apparatus 1300. In some aspects, apparatus 1300 includes a receiving component 1302 and a transmitting component 1304, which may communicate with each other (e.g., via one or more buses and / or one or more other components). As shown, apparatus 1300 may communicate with another apparatus 1306 (such as a UE, a base station, or another wireless communication device) using receiving component 1302 and transmitting component 1304. As further shown, apparatus 1300 may include a communication manager 140. Communication manager 140 may include one or more of identification components 1308, among other examples.

[0168] In some aspects, the apparatus 1300 may be configured to perform Figure 3-Figure 10 Additionally or alternatively, the apparatus 1300 may be configured to perform one or more processes described herein, such as Fig.11 In some aspects, Fig.13 The apparatus 1300 and / or one or more components shown in FIG. 1 may include a combination of Figure 2 Additionally or alternatively, Fig.13 One or more of the components shown in the figure may be combined with Figure 2 In some embodiments, the present invention relates to a component that is implemented in one or more components described herein. Additionally or alternatively, one or more components in the set of components may be at least partially implemented as software stored in a memory. For example, a component (or a portion of a component) may be implemented as an instruction or code stored in a non-transitory computer-readable medium and executable by a controller or processor to perform the function or operation of the component.

[0169] Receiving component 1302 may receive communications from apparatus 1306, such as reference signals, control information, data communications, or a combination thereof. Receiving component 1302 may provide the received communications to one or more other components of apparatus 1300. In some aspects, receiving component 1302 may perform signal processing (e.g., filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, demapping, equalization, interference cancellation, or decoding, among other examples) on the received communications and may provide the processed signals to one or more other components of apparatus 1300. In some aspects, receiving component 1302 may include combining Figure 2 One or more antennas, modems, demodulators, MIMO detectors, receive processors, controllers / processors, memories, or combinations thereof of a UE are described.

[0170] Transmitting component 1304 may transmit communications such as reference signals, control information, data communications, or combinations thereof to device 1306. In some aspects, one or more other components of device 1300 may generate communications and may provide the generated communications to transmitting component 1304 for transmission to device 1306. In some aspects, transmitting component 1304 may perform signal processing (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, among other examples) on the generated communications and may transmit the processed signals to device 1306. In some aspects, transmitting component 1304 may include combining Figure 2 One or more antennas, modems, modulators, transmit MIMO processors, transmit processors, controllers / processors, memories, or combinations thereof of the described UE. In some aspects, the transmit component 1304 can be co-located with the receive component 1302 in a transceiver.

[0171] The identification component 1308 can identify the maximum number of MIMO layers for communication based at least in part on at least one of a number of CSI-RS ports associated with the network node or a transition of a TRP associated with the network node to a sleep state or from a sleep state. The receiving component 1302 or the sending component 1304 can perform communication according to the maximum number of MIMO layers.

[0172] Receiving component 1302 can receive information indicating a number of CSI-RS ports, wherein identifying a maximum number of MIMO layers is based at least in part on the information.

[0173] The receiving component 1302 can receive information indicating a transition of the TRP to a dormant state, wherein identifying the maximum number of MIMO layers is based at least in part on the information.

[0174] Receiving component 1302 can receive configuration information indicating a mapping.

[0175] Receiving component 1302 can receive an indication of a scaling factor.

[0176] Fig.13 The number and arrangement of components shown are provided as examples. Fig.13 There may be additional components, fewer components, different components, or differently arranged components than those shown in . Fig.13 Two or more components shown in may be implemented in a single component. Fig.13 The single component shown may be implemented as multiple distributed components. Additionally or alternatively, Fig.13 The illustrated set (one or more) of components may perform the operations described as being performed by Fig.13 Another group of components shown performs one or more functions.

[0177] Fig.14 1 is a diagram of an example apparatus 1400 for wireless communication according to the present disclosure. Apparatus 1400 may be a network node, or a network node may include apparatus 1400. In some aspects, apparatus 1400 includes a receiving component 1402 and a sending component 1404, which may communicate with each other (e.g., via one or more buses and / or one or more other components). As shown, apparatus 1400 may communicate with another apparatus 1406 (such as a UE, a base station, or another wireless communication device) using receiving component 1402 and sending component 1404. As further shown, apparatus 1400 may include a communication manager 150. Communication manager 150 may include one or more of configuration component 1408 or identification component 1410, among other examples.

[0178] In some aspects, the apparatus 1400 may be configured to perform the Figure 3-Figure 10 Additionally or alternatively, the apparatus 1400 may be configured to perform one or more processes described herein, such as Fig.12 In some aspects, Fig.14 The apparatus 1400 and / or one or more components shown in FIG. 1400 may include a combination of Figure 2 Additionally or alternatively, Fig.14 One or more of the components shown in the figure may be combined with Figure 2 In some embodiments, the present invention relates to a component that is implemented in one or more components described herein. Additionally or alternatively, one or more components in the set of components may be at least partially implemented as software stored in a memory. For example, a component (or a portion of a component) may be implemented as instructions or codes stored in a non-transitory computer-readable medium and executable by a controller or processor to perform the function or operation of the component.

[0179] Receiving component 1402 may receive communications from device 1406, such as reference signals, control information, data communications, or a combination thereof. Receiving component 1402 may provide the received communications to one or more other components of device 1400. In some aspects, receiving component 1402 may perform signal processing (e.g., filtering, amplification, demodulation, analog-to-digital conversion, demultiplexing, deinterleaving, demapping, equalization, interference cancellation, or decoding, among other examples) on the received communications and may provide the processed signals to one or more other components of device 1400. In some aspects, receiving component 1402 may include combining Figure 2 One or more antennas, modems, demodulators, MIMO detectors, receive processors, controllers / processors, memories, or combinations thereof, of the described network nodes.

[0180] The transmitting component 1404 may transmit communications such as reference signals, control information, data communications, or combinations thereof to the device 1406. In some aspects, one or more other components of the device 1400 may generate communications and may provide the generated communications to the transmitting component 1404 for transmission to the device 1406. In some aspects, the transmitting component 1404 may perform signal processing (such as filtering, amplification, modulation, digital-to-analog conversion, multiplexing, interleaving, mapping, or encoding, among other examples) on the generated communications and may transmit the processed signals to the device 1406. In some aspects, the transmitting component 1404 may include combining Figure 2 One or more antennas, modems, modulators, transmit MIMO processors, transmit processors, controllers / processors, memories, or combinations thereof of the described network nodes. In some aspects, the transmit component 1404 can be co-located with the receive component 1402 in a transceiver.

[0181] The transmitting component 1404 may transmit at least one of the following: information indicating the number of CSI-RS ports associated with the network node, or information indicating a transition of a TRP associated with the network node to a dormant state or from a dormant state. The transmitting component 1404 or the receiving component 1402 may perform communication according to the maximum number of MIMO layers, wherein the maximum number of MIMO layers is based at least in part on at least one of the number of CSI-RS ports or the transition of the TRP to the dormant state.

[0182] Configuration component 1408 can send configuration information indicating the mapping.

[0183] Configuration component 1408 can send an indication of the scaling factor.

[0184] Identification component 1410 can identify a maximum number of MIMO layers.

[0185] Fig.14 The number and arrangement of components shown are provided as examples. Fig.14 There may be additional components, fewer components, different components, or differently arranged components than those shown in . Fig.14 Two or more of the components shown in may be implemented in a single component, or Fig.14 The single component shown in can be implemented as multiple distributed components. Additionally or alternatively, Fig.14 The illustrated set (one or more) of components may perform the operations described as being performed by Fig.14 Another group of components shown performs one or more functions.

[0186] The following provides an overview of some aspects of the disclosure:

[0187] Aspect 1: A wireless communication method performed by a user equipment (UE), comprising: identifying a maximum number of multiple-input multiple-output (MIMO) layers for communication based at least in part on at least one of the following: a number of channel state information reference signal (CSI-RS) ports associated with a network node, or a transition of a transmission reception point (TRP) associated with the network node to a sleep state or from a sleep state; and performing communication according to the maximum number of MIMO layers.

[0188] Aspect 2: The method according to aspect 1 further includes: receiving information indicating the number of CSI-RS ports, wherein identifying the maximum number of MIMO layers is based at least in part on the information.

[0189] Aspect 3: The method according to Aspect 1 further includes: receiving information indicating a transition of the TRP to or from a sleep state, wherein identifying the maximum number of MIMO layers is at least partially based on the information.

[0190] Aspect 4: According to the method according to any one of aspects 1-2, identifying the maximum number of MIMO layers further comprises: identifying the maximum number of MIMO layers according to a mapping between the number of CSI-RS ports and the maximum number of MIMO layers.

[0191] Aspect 5: A method according to Aspect 4, wherein the first number of CSI-RS ports is mapped to the first number of MIMO layers, and the second number of CSI-RS ports is mapped to the second number of MIMO layers, wherein the first number of MIMO layers is greater than the second number of MIMO layers, and the first number of CSI-RS ports is greater than the second number of CSI-RS ports.

[0192] Aspect 6: A method according to Aspect 5, wherein the maximum number of MIMO layers is the second number of MIMO layers and the number of CSI-RS ports associated with the network node is the second number of CSI-RS ports, wherein the method further comprises: receiving information indicating the number of active CSI-RS ports to the second number of CSI-RS ports from the network node, wherein identifying the maximum number of MIMO layers is based at least in part on the information.

[0193] Aspect 7: The method according to any one of Aspects 4-7 further includes: receiving configuration information indicating mapping.

[0194] Aspect 8: A method according to any one of Aspects 1 or 3, wherein identifying the maximum number of MIMO layers further comprises: identifying the maximum number of MIMO layers as the sum of the maximum number of MIMO layers of one or more non-dormant TRPs associated with the network node.

[0195] Aspect 9: A method according to Aspect 1, wherein the network node is associated with two TRPs, wherein the TRP associated with the sleep state is associated with a first maximum number of MIMO layers, and the non-sleep TRP is associated with a second maximum number of MIMO layers, and wherein the maximum number of MIMO layers used for communication is the second maximum number of MIMO layers.

[0196] Aspect 10: A method according to any one of Aspects 1, 3, 8-9, wherein identifying the maximum number of MIMO layers also includes: identifying the maximum number of MIMO layers by applying a scaling factor to a previous maximum number of MIMO layers based at least in part on a transition of a TRP associated with the network node to a sleep state or from a sleep state.

[0197] Aspect 11: The method according to aspect 10 further comprises: receiving an indication of a scaling factor.

[0198] Aspect 12: The method according to any one of aspects 1-11, wherein the maximum number of MIMO layers is configured to be identified per bandwidth part based at least in part on a per-bandwidth part configuration of the maximum number of MIMO layers.

[0199] Aspect 13: The method according to any one of aspects 1-11, wherein the maximum number of MIMO layers is identified per cell based at least in part on a per-bandwidth partial configuration of the maximum number of MIMO layers not being configured.

[0200] Aspect 14: A method according to any one of Aspects 1-11, wherein: if the per-bandwidth part configuration of the maximum number of MIMO layers is configured, the maximum number of MIMO layers is identified at least in part based on the maximum number of MIMO layers configured for the bandwidth part, and if the per-bandwidth part configuration of the maximum number of MIMO layers is not configured, the maximum number of MIMO layers is identified at least in part based on the maximum number of MIMO layers configured for the cell.

[0201] Aspect 15: A wireless communication method performed by a network node, comprising: sending at least one of the following: information indicating the number of channel state information reference signal (CSI-RS) ports associated with the network node, or information indicating the transition of a transmission reception point (TRP) associated with the network node to a sleep state or from a sleep state; and performing communication based on a maximum number of multiple-input multiple-output (MIMO) layers, wherein the maximum number of MIMO layers is at least partially based on at least one of the number of CSI-RS ports or the transition of the TRP to the sleep state.

[0202] Aspect 16: The method of aspect 15, wherein the maximum number of MIMO layers is based at least in part on a mapping between the number of CSI-RS ports and the maximum number of MIMO layers.

[0203] Aspect 17: A method according to Aspect 16, wherein the first number of CSI-RS ports is mapped to the first number of MIMO layers, and the second number of CSI-RS ports is mapped to the second number of MIMO layers, wherein the first number of MIMO layers is greater than the second number of MIMO layers, and the first number of CSI-RS ports is greater than the second number of CSI-RS ports.

[0204] Aspect 18: The method according to Aspect 16 further includes: sending configuration information indicating the mapping.

[0205] Aspect 19: The method according to Aspect 15, wherein the maximum number of MIMO layers is equal to the sum of the maximum number of MIMO layers of one or more non-dormant TRPs associated with the network node.

[0206] Aspect 20: A method according to Aspect 19, wherein the network node is associated with two TRPs, wherein the TRP associated with the sleep state is associated with a first maximum number of MIMO layers, and the non-sleep TRP is associated with a second maximum number of MIMO layers, and wherein the maximum number of MIMO layers used for communication is the second maximum number of MIMO layers.

[0207] Aspect 21: A method according to Aspect 15, wherein the maximum number of MIMO layers is determined by applying a scaling factor to a previous maximum number of MIMO layers based at least in part on a transition of a TRP associated with the network node to a dormant state.

[0208] Aspect 22: The method according to Aspect 21 further comprises: sending an indication of the scaling factor.

[0209] Aspect 23: The method according to any one of aspects 15-22, wherein the maximum number of MIMO layers is configured to be identified per bandwidth part based at least in part on a per-bandwidth part configuration of the maximum number of MIMO layers.

[0210] Aspect 24: The method according to any one of aspects 15-22, wherein the maximum number of MIMO layers is configured to be identified per cell based at least in part on a per-bandwidth partial configuration of the maximum number of MIMO layers.

[0211] Aspect 25: A method according to any one of Aspects 15-22, wherein: if the per-bandwidth part configuration of the maximum number of MIMO layers is configured, the maximum number of MIMO layers is identified at least in part based on the maximum number of MIMO layers configured for the bandwidth part, and if the per-bandwidth part configuration of the maximum number of MIMO layers is not configured, the maximum number of MIMO layers is identified at least in part based on the maximum number of MIMO layers configured for the cell.

[0212] Aspect 26: An apparatus for wireless communication at a device, comprising a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform the method of one or more aspects of aspects 1-25.

[0213] Aspect 27: A device for wireless communication, comprising a memory and one or more processors coupled to the memory, the one or more processors configured to perform the method of one or more aspects of aspects 1-25.

[0214] Aspect 28: An apparatus for wireless communication, comprising at least one unit for performing the method of one or more aspects of aspects 1-25.

[0215] Aspect 29: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method of one or more aspects of aspects 1-25.

[0216] Aspect 30: A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising one or more instructions that, when executed by one or more processors of a device, cause the device to perform one or more methods of aspects 1-25.

[0217] The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit the aspects to the precise forms disclosed. Modifications and variations may be made in light of the above disclosure or may be acquired from practice of the aspects.

[0218] As used herein, the term "component" is intended to be broadly interpreted as hardware and / or a combination of hardware and software. "Software" should be broadly interpreted as instructions, instruction sets, codes, code segments, program codes, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, processes and / or functions and other examples, whether referred to as software, firmware, middleware, microcode, hardware description language or other. As used herein, a "processor" is implemented in hardware and / or a combination of hardware and software. Obviously, the systems and / or methods described herein can be implemented in different forms of hardware and / or a combination of hardware and software. The actual dedicated control hardware or software code used to implement these systems and / or methods does not limit these aspects. Therefore, the operation and behavior of the system and / or method are described herein without reference to specific software codes, because those skilled in the art will understand that software and hardware can be designed to implement the system and / or method based at least in part on the description herein.

[0219] As used herein, "satisfying a threshold" may refer to a value being greater than a threshold, greater than or equal to a threshold, less than a threshold, less than or equal to a threshold, equal to a threshold, not equal to a threshold, etc., depending on the context.

[0220] Although the specific combination of features is described in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of various aspects. Many of these features can be combined in a manner that is not specifically described in the claims and / or disclosed in the specification. The disclosure of various aspects includes the combination of each dependent claim with each other claim in the claim set. As used herein, the phrase "at least one" of the item list refers to any combination of those items, including a single member. As an example, "at least one of a, b or c" is intended to cover a, b, c, a+b, a+c, b+c and a+b+c, and any combination with multiple identical elements (e.g., a+a, a+a+a, a+a+b, a+a+c, a+b+b, a+c+c, b+b, b+b+b, b+b+c, c+c and c+c+c, or any other order of a, b and c).

[0221] Unless clearly described, any element, behavior or instruction used in this article should not be interpreted as key or necessary. In addition, as used herein, the article "one" and "an" are intended to include one or more projects and can be used interchangeably with "one or more". In addition, as used herein, the article "the" is intended to include one or more projects related to the article "the", and can be used interchangeably with "one or more". In addition, as used herein, the term "set" and "group" are intended to include one or more projects and can be used interchangeably with "one or more". If only one project is referred to, the phrase "only one" or similar language is used. In addition, as used herein, the term "has", "have", "having" etc. are intended to be open terms, which do not limit the elements they modify (for example, "having" A elements can also have B). In addition, unless otherwise clearly stated, the phrase "based on" is intended to represent "at least partially based on". In addition, as used herein, the term "or" is intended to be included when used in series, and can be used interchangeably with "and / or", unless otherwise clearly stated (for example, if used in combination with "any" or "or").

Claims

1. An apparatus for a user equipment (UE) for wireless communication, comprising: Memory; as well as one or more processors, the one or more processors coupled to the memory, the one or more processors configured to: identifying a maximum number of multiple-input multiple-output (MIMO) layers for communication based at least in part on at least one of: a number of channel state information reference signal (CSI-RS) ports associated with a network node, or a transition of a transmit reception point (TRP) associated with the network node to or from a dormant state; as well as The communicating is performed according to the maximum number of MIMO layers.

2. The device according to claim 1, wherein: The one or more processors are further configured to: Information indicative of the number of CSI-RS ports is received, wherein identifying the maximum number of MIMO layers is based at least in part on the information.

3. The device according to claim 1, wherein: The one or more processors are further configured to: Receiving information indicating the transition of the TRP to or from the sleep state, wherein identifying the maximum number of MIMO layers is based at least in part on the information.

4. The device according to claim 1, wherein: To identify the maximum number of MIMO layers, the one or more processors are configured to: The maximum number of MIMO layers is identified according to a mapping between the number of CSI-RS ports and the maximum number of MIMO layers.

5. The device according to claim 4, wherein: The first number of CSI-RS ports is mapped to the first number of MIMO layers, and the second number of CSI-RS ports is mapped to the second number of MIMO layers, wherein the first number of MIMO layers is greater than the second number of MIMO layers, and the first number of CSI-RS ports is greater than the second number of CSI-RS ports.

6. The device according to claim 5, wherein: The maximum number of MIMO layers is the second number of MIMO layers, and the number of CSI-RS ports associated with the network node is the second number of CSI-RS ports, wherein the one or more processors are configured to: Information indicating the number of active CSI-RS ports to the second number of CSI-RS ports is received from the network node, wherein identifying the maximum number of MIMO layers is based at least in part on the information.

7. The device according to claim 4, wherein: The one or more processors are further configured to: Configuration information indicative of the mapping is received.

8. The device according to claim 1, wherein: To identify the maximum number of MIMO layers, the one or more processors are configured to: The maximum number of MIMO layers is identified as the sum of the maximum number of MIMO layers of one or more non-dormant TRPs associated with the network node.

9. The device according to claim 1, wherein: The network node is associated with two TRPs, wherein the TRP associated with the sleep state is associated with a first maximum number of MIMO layers and the non-sleep TRP is associated with a second maximum number of MIMO layers, and wherein the maximum number of MIMO layers used for the communication is the second maximum number of MIMO layers.

10. The device according to claim 1, wherein: To identify the maximum number of MIMO layers, the one or more processors are configured to: Based at least in part on the transition of the TRP associated with the network node to or from the sleep state, the maximum number of MIMO layers is identified by applying a scaling factor to a previous maximum number of MIMO layers.

11. The device according to claim 10, wherein: The one or more processors are further configured to: An indication of the scaling factor is received.

12. The device according to claim 1, wherein: The maximum number of MIMO layers is configured to be identified per bandwidth part based at least in part on a per-bandwidth part configuration of the maximum number of MIMO layers.

13. The device according to claim 1, wherein: The maximum number of MIMO layers is identified per cell based at least in part on a per-bandwidth partial configuration of the maximum number of MIMO layers being not configured.

14. The device according to claim 1, wherein: If a per-bandwidth part configuration of a maximum number of MIMO layers is configured, the maximum number of MIMO layers is identified based at least in part on the maximum number of MIMO layers configured for the bandwidth part, and If a per-bandwidth partial configuration of a maximum number of MIMO layers is not configured, the maximum number of MIMO layers is identified based at least in part on a maximum number of MIMO layers configured for the cell.

15. A network node for wireless communication, comprising: Memory; as well as one or more processors, the one or more processors being coupled to the memory, the one or more processors being configured to: transmitting at least one of: information indicating a number of channel state information reference signal (CSI-RS) ports associated with the network node, or information indicating a transition of a transmission reception point (TRP) associated with the network node to or from a dormant state; as well as Communicating is performed based on a maximum number of multiple-input multiple-output (MIMO) layers, wherein the maximum number of MIMO layers is based at least in part on at least one of the number of CSI-RS ports or the transition of the TRP to the sleep state.

16. The network node according to claim 15, wherein: The maximum number of MIMO layers is based at least in part on a mapping between the number of CSI-RS ports and the maximum number of MIMO layers.

17. The network node according to claim 16, wherein: The first number of CSI-RS ports is mapped to the first number of MIMO layers, and the second number of CSI-RS ports is mapped to the second number of MIMO layers, wherein the first number of MIMO layers is greater than the second number of MIMO layers, and the first number of CSI-RS ports is greater than the second number of CSI-RS ports.

18. The network node according to claim 16, wherein: The one or more processors are further configured to: Configuration information indicating the mapping is sent.

19. The network node according to claim 15, wherein: The maximum number of MIMO layers is equal to the sum of the maximum number of MIMO layers of one or more non-dormant TRPs associated with the network node.

20. The network node according to claim 19, wherein: The network node is associated with two TRPs, wherein the TRP associated with the sleep state is associated with a first maximum number of MIMO layers and the non-sleep TRP is associated with a second maximum number of MIMO layers, and wherein the maximum number of MIMO layers used for the communication is the second maximum number of MIMO layers.

21. The network node according to claim 15, wherein: Based at least in part on the transition of the TRP associated with the network node to the dormant state, the maximum number of MIMO layers is based at least in part on a scaling factor applied to a previous maximum number of MIMO layers.

22. The network node according to claim 21, wherein: The one or more processors are further configured to: An indication of the scaling factor is sent.

23. The network node according to claim 15, wherein: The maximum number of MIMO layers is configured to be identified per bandwidth part based at least in part on a per-bandwidth part configuration of the maximum number of MIMO layers.

24. The network node according to claim 15, wherein: The maximum number of MIMO layers is configured to be identified per cell based at least in part on a per-bandwidth portion configuration of the maximum number of MIMO layers.

25. The network node of claim 15, wherein: If a per-bandwidth part configuration of a maximum number of MIMO layers is configured, the maximum number of MIMO layers is identified based at least in part on the maximum number of MIMO layers configured for the bandwidth part, and If the per-bandwidth partial configuration of the maximum number of MIMO layers is not configured, the maximum number of MIMO layers is identified based at least in part on the maximum number of MIMO layers configured for the cell.

26. A method of wireless communication performed by a user equipment (UE), comprising: identifying a maximum number of multiple-input multiple-output (MIMO) layers for communication based at least in part on at least one of: a number of channel state information reference signal (CSI-RS) ports associated with a network node, or a transition of a transmit reception point (TRP) associated with the network node to or from a dormant state; as well as The communicating is performed according to the maximum number of MIMO layers.

27. The method according to claim 26, further comprising: Information indicative of the number of CSI-RS ports is received, wherein identifying the maximum number of MIMO layers is based at least in part on the information.

28. The method of claim 26, further comprising: Receiving information indicating the transition of the TRP to or from the sleep state, wherein identifying the maximum number of MIMO layers is based at least in part on the information.

29. A method of wireless communication performed by a network node, comprising: transmitting at least one of: information indicating a number of channel state information reference signal (CSI-RS) ports associated with the network node, or information indicating a transition of a transmission reception point (TRP) associated with the network node to or from a dormant state; as well as Communicating is performed based on a maximum number of multiple-input multiple-output (MIMO) layers, wherein the maximum number of MIMO layers is based at least in part on at least one of the number of CSI-RS ports or the transition of the TRP to the sleep state.

30. The method of claim 29, wherein: The maximum number of MIMO layers is based at least in part on a mapping between the number of CSI-RS ports and the maximum number of MIMO layers.

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