Techniques for using predicted beams in wireless communications

Abstract

Aspects described herein relate to receiving, from a network node, a configuration indicating spatial relationship information associated with a virtual downlink beam resource or at least one of an angle of arrival (AoA) or an angle of departure (AoD) associated with a channel between a UE and the network node. A sounding reference signal (SRS) based on the virtual downlink beam resource or at least one of the AoA or AoD associated with the channel and according to the spatial relationship information may be transmitted to the network node. Other aspects relate to transmitting the configuration and receiving the SRS.

Description

Technical Field

[0001] Aspects of the present disclosure relate generally to wireless communication systems, and more particularly to techniques for using beams based on beam prediction.

[0002] Related technologies

[0003] Wireless communication systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, etc. These systems may be multiple-access systems capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power). Examples of such multiple-access systems 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, and single-carrier frequency division multiple access (SC-FDMA) systems.

[0004] These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate at a city, country, region, and even global level. For example, the fifth generation (5G) wireless communication technology, which may be referred to as 5G New Radio (5G NR), is designed to expand and support diverse usage scenarios and applications for current mobile network generations. On the one hand, 5G communication technology may include: enhanced mobile broadband addressing people-centric use cases for accessing multimedia content, services, and data; ultra-reliable low-latency communications (URLLC) with certain specifications for latency and reliability; and massive machine-type communications that may allow very large numbers of connected devices and the transmission of relatively small amounts of non-delay-sensitive information. Summary of the invention

[0005] The following presents the summary of one or more aspects in order to provide a basic understanding of these aspects. This summary is not an extensive overview of all contemplated aspects, and is neither intended to identify the key or important elements of all aspects, nor to describe the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to a more detailed description presented later.

[0006] According to one aspect, a device for wireless communication is provided, the device comprising: a processor; a memory coupled to the processor; and instructions stored in the memory. The instructions, when executed by the processor, are operable to cause the device to receive a configuration indicating spatial relationship information associated with at least one of the following: a virtual downlink beam resource; or an AoA or AoD associated with a channel between the device and the network node from a network node, and to send a sounding reference signal (SRS) based on the virtual downlink beam resource or at least one of the AoA or AoD associated with the channel and according to the spatial relationship information to the network node.

[0007] In another aspect, an apparatus for wireless communication is provided, the apparatus comprising: a processor; a memory coupled to the processor; and instructions stored in the memory. The instructions, when executed by the processor, are operable to cause the apparatus to send, for a user equipment (UE), a configuration indicating spatial relationship information associated with at least one of: a virtual downlink beam resource; or an AoA or AoD associated with a channel between the UE and the apparatus, and to receive, for the UE, an SRS based on at least one of the virtual downlink beam resource or the AoA or AoD associated with the channel and according to the spatial relationship information.

[0008] On the other hand, a method for wireless communication at a UE is provided, the method comprising: receiving a configuration indicating spatial relationship information associated with at least one of: a virtual downlink beam resource; or an AoA or AoD associated with a channel between the UE and the network node from a network node, and sending an SRS to the network node based on the virtual downlink beam resource or at least one of the AoA or AoD associated with the channel and in accordance with the spatial relationship information.

[0009] On the other hand, a method for wireless communication at a network node is provided, the method comprising: sending, for a UE, a configuration indicating spatial relationship information associated with at least one of: a virtual downlink beam resource; or an AoA or AoD associated with a channel between the UE and the network node, and receiving, for the UE, an SRS based on the virtual downlink beam resource or at least one of the AoA or AoD associated with the channel and in accordance with the spatial relationship information.

[0010] In a further aspect, an apparatus for wireless communication is provided, the apparatus comprising: a transceiver; a memory configured to store instructions; and one or more processors communicatively coupled to the transceiver and the memory. The one or more processors are configured to execute the instructions to perform the operations of the methods described herein. In another aspect, an apparatus for wireless communication is provided, the apparatus comprising means for performing the operations of the methods described herein. In yet another aspect, a computer-readable medium is provided, the computer-readable medium comprising code executable by one or more processors to perform the operations of the methods described herein.

[0011] To achieve the foregoing and related ends, one or more aspects include the features fully described below and particularly pointed out in the claims. The following description and the accompanying drawings set forth in detail some illustrative features of one or more aspects. However, these features are merely indicative of some of the various ways in which the principles of the various aspects may be employed, and this specification is intended to include all such aspects and their equivalents. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The disclosed aspects will be described below in conjunction with the accompanying drawings, which are provided to illustrate rather than limit the disclosed aspects, wherein like numerals represent like elements, and in which:

[0013] Figure 1 An example of a wireless communication system is illustrated according to various aspects of the present disclosure;

[0014] Figure 2 is a diagram illustrating an example of a decomposed base station architecture according to various aspects of the present disclosure;

[0015] Figure 3 is a block diagram illustrating an example of a user equipment (UE) according to various aspects of the present disclosure;

[0016] Figure 4 is a block diagram illustrating an example of a base station according to various aspects of the present disclosure;

[0017] Figure 5 is a flow chart illustrating an example of a method for receiving and using spatial relationship information for angle of arrival (AoA) / angle of departure (AoD) associated with a virtual downlink beam resource or a channel in accordance with various aspects described herein;

[0018] Figure 6 is a flow chart illustrating an example of a method for configuring spatial relationship information for a virtual downlink beam resource or AoA / AoD associated with a channel according to various aspects described herein;

[0019] Figure 7illustrating an example of a system for transmitting an uplink beam recommendation based on downlink beam prediction in accordance with various aspects described herein; and

[0020] Figure 8 is a block diagram illustrating an example of a multiple-input multiple-output (MIMO) communication system including a base station and UEs according to various aspects of the present disclosure. DETAILED DESCRIPTION

[0021] Various aspects are now described with reference to the accompanying drawings. In the following description, for the purpose of explanation, in order to provide a thorough understanding of one or more aspects, numerous specific details are described. However, it is apparent that such aspects can be practiced without these specific details.

[0022] The features described generally relate to using predicted beams in wireless communications. In some wireless communication technologies, such as fifth generation (5G) new radio (NR), nodes of a network, such as user equipment (UE), network nodes, etc., may perform wireless communications using beams by beamforming antenna elements to achieve beams that are communicated in spatial directions. These devices may use artificial intelligence (AI) / machine learning (ML) based techniques to derive the beams to be used. For example, the device may perform beam prediction in time and / or spatial directions to reduce the overhead and latency otherwise associated with performing signal measurements to select beams. In some examples, the UE and / or gNB may collaborate to derive the beams to be used, which may include deriving beams for use by the gNB and reciprocal beams for use by the UE. The AI / ML methods used for selected use cases may be diverse enough to support various requirements for the level of gNB / UE collaboration.

[0023] For example, without using AI / ML prediction, beam quality / failure is identified via measurement, where more power / overhead may be required to achieve good performance, beam accuracy may be limited due to constraints on power / overhead, latency / throughput may be affected by beam recovery efforts, etc. Predictive beam management (on spatial division (SD) / time division (TD) / frequency division (FD)) may result in reduced power / overhead or improved accuracy / latency / throughput. For example, predicting non-measured beam quality may result in lower power / overhead or better accuracy, and / or predicting future beam blockage / failure may result in better latency / throughput. Beam prediction can be a highly nonlinear problem. For example, predicting future transmit beam quality may depend on the UE's moving speed / trajectory, the receive beam used or to be used, interference, etc., which may be difficult to model via conventional statistical signaling processing methods.

[0024] Therefore, AI / ML can be used to predict beams, where the prediction can occur at the UE and / or the gNB. In the case where the beams are predicted, a trade-off between performance and UE power can be provided. For example, to predict future downlink transmit beam quality, the UE has more observations (via measurements) than the gNB (via UE feedback), so the prediction at the UE can outperform the prediction at the gNB by consuming more UE power for inference effort. Whether the training is performed at the gNB or the UE can balance the effort in data collection with the effort in UE computation. For training at the gNB, data can be collected via the (enhanced) air interface or via application layer methods. For training at the UE, additional UE computation / buffering effort can be used by the modeling training and the necessary data storage can be used.

[0025] AI / ML-based beam prediction may be based on one or more of SD+TD compressed beam measurements that may use fewer beam measurements and use codebook-based SD selection to provide UE power reduction, or raw channel extraction that may use non-codebook-based SD selection to provide better beam management accuracy without excessive beam scanning, or a combination thereof. In another example, AI / ML-based beam prediction may include TD prediction for predicting future physical uplink shared channel (PUSCH) transmit beams for the UE, which may use fewer frequency sounding reference signal (SRS) transmissions at the UE, resulting in UE power reduction and reduced SRS overhead. In another example, AI / ML-based beam prediction may include SD+TD prediction for predicting future PUSCH transmit beams for the UE in non-sounding directions, which may use spatially sparse SRS transmissions at the UE, resulting in UE power reduction and reduced SRS overhead, as well as more accurate uplink transmit beams. In another example, AI / ML-based beam prediction may include FD prediction for predicting higher frequency uplink transmit beams for a UE via a lower frequency SRS, which may provide better coverage or less radio frequency (RF) phase shift at lower frequencies, resulting in reduced UE power and requiring a smaller number of beams at lower frequencies, resulting in reduced SRS overhead.

[0026] In various aspects described herein, when the UE has beam correspondence, the UE may perform uplink beam prediction based on the predicted downlink beam (e.g., so that the UE may use a beam that is reciprocal to the downlink beam). For example, when predicting a DL beam, the associated receive beam may also be predicted by the UE. In general, if the UE has beam correspondence, the UE may use a receive (Rx) spatial filter that receives a downlink reference signal (DL-RS) to derive a transmit (Tx) spatial filter for sending an associated SRS. However, for a predicted downlink beam, the beam may be in a virtual resource and / or may be associated with an angle of arrival (AoA) / angle of departure (AoD) channel characteristic of a channel between the network and the UE, such that the network may not send a downlink beam and the UE may not receive a downlink beam. In this example, the UE may not have a signal from which to derive an Rx spatial filter for receiving a downlink beam. According to various aspects described herein, the UE may use a predicted Rx spatial filter to receive such a predicted downlink beam and / or may derive a Tx spatial filter for sending an associated SRS.

[0027] In one example, the network may configure SRS spatial relationship information for the UE, wherein the SRS spatial relationship information may be associated with a virtual resource or AoA / AoD, which may be predicted or reported by the UE or indicated by the network as a beam prediction result. Therefore, when predicting a downlink beam (e.g., by the UE, or predicted by the network and provided to the UE), the UE may derive the SRS spatial relationship information for the predicted downlink beam, and accordingly use the Tx spatial filter to send an associated SRS based on the SRS spatial relationship information for the predicted downlink beam. This may result in less overhead required for the UE to send the SRS, which may save radio resources and UE processing requirements. This may accordingly improve the user experience of using the network and / or UE, etc.

[0028] The following will refer to Figures 1 to 8 The described features are presented in more detail.

[0029] As used in this application, the terms "component", "module", "system", etc. are intended to include computer-related entities such as, but not limited to, hardware, firmware, a combination of hardware and software, software, or software in execution. For example, a component can be, but is not limited to: a process running on a processor, a processor, an object, an executable file, a thread of execution, a program, and / or a computer. By way of example, both an application running on a computing device and a computing device can be a component. One or more components may exist in a process and / or a thread of execution, and a component may be located in a computer and / or distributed between two or more computers. In addition, these components can be executed from various computer-readable media having various data structures stored thereon. Components can communicate by means of local and / or remote processes, such as according to signals having one or more data packets (such as data from a component that interacts with another component in a local system, a distributed system, and / or interacts with other systems across a network such as the Internet).

[0030] The technology described herein can be used for various wireless communication systems, such as CDMA, TDMA, FDMA, OFDMA, single carrier FDMA and other systems. The terms "system" and "network" can often be used interchangeably. A CDMA system can implement radio technologies such as CDMA2000, Universal Terrestrial Radio Access (UTRA), etc. CDMA2000 covers IS-2000, IS-95 and IS-856 standards. IS-2000 versions 0 and A are commonly referred to as CDMA2000 1X, 1X, etc. IS-856 (TIA-856) is commonly referred to as CDMA2000 1xEV-DO, High Speed ​​Packet Data (HRPD), etc. UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA. A TDMA system can implement radio technologies such as Global System for Mobile Communications (GSM). An OFDMA system may implement radio technologies such as Ultra Mobile Broadband (UMB), Evolved UTRA (E-UTRA), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM TMEtc. UTRA and E-UTRA are part of the Universal Mobile Telecommunications System (UMTS). 3GPP Long Term Evolution (LTE) and Advanced LTE (LTE-A) are new versions of UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, and GSM are described in documents of an organization named "3rd Generation Partnership Project" (3GPP). CDMA2000 and UMB are described in documents of an organization named "3rd Generation Partnership Project 2" (3GPP2). The techniques described herein can be used for the above-mentioned systems and radio technologies as well as other systems and radio technologies, including cellular (e.g., LTE) communications on shared radio frequency spectrum bands. However, the following description describes an LTE / LTE-A system for example purposes, and LTE terminology is used in most of the following description, but these techniques can also be applied beyond LTE / LTE-A applications (e.g., to fifth generation (5G) new radio (NR) networks or other next generation communication systems).

[0031] The following description provides examples, but does not limit the scope, applicability or examples set forth in the claims. The functions and arrangements of the elements discussed may be changed without departing from the scope of the present disclosure. Various procedures or components may be omitted, replaced or added to each example as appropriate. For example, the described method may be performed in a different order than described, and various steps may be added, omitted or combined. In addition, the features described with respect to some examples may be combined in other examples.

[0032] Various aspects or features will be presented with respect to systems that may include multiple devices, components, modules, etc. It should be understood and appreciated that the various systems may include additional devices, components, modules, etc. and / or may not include all of the devices, components, modules, etc. discussed in conjunction with the figures. Combinations of these methods may also be used.

[0033] Figure 11 is a diagram illustrating an example of a wireless communication system and an access network 100. The wireless communication system (also referred to as a wireless wide area network (WWAN)) may include a base station 102, a UE 104, an evolved packet core (EPC) 160, and / or a 5G core (5GC) 190. The base station 102 may include a macro cell (a high power cellular base station) and / or a small cell (a low power cellular base station). The macro cell may include a base station. The small cell may include a femto cell, a pico cell, and a micro cell. In one example, the base station 102 may also include a gNB 180, as further described herein. In one example, in accordance with various aspects described herein, some nodes of the wireless communication system may have a modem 340 and a UE communication component 342 for receiving spatial relationship information for a virtual downlink beam resource or an AoA / AoD associated with a channel. In addition, in accordance with various aspects described herein, some nodes may have a modem 440 and a BS communication component 442 for configuring spatial relationship information for a virtual downlink beam resource or an AoA / AoD associated with a channel. Although UE 104 is shown as having a modem 340 and a UE communication component 342, and base station 102 / gNB180 is shown as having a modem 440 and a BS communication component 442, this is an illustrative example, and substantially any node or type of node may include a modem 340 and a UE communication component 342 and / or a modem 440 and a BS communication component 442 to provide the corresponding functionality described herein.

[0034] The base station 102 configured for 4G LTE (which may be collectively referred to as the Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN)) may interface with the EPC 160 via a backhaul link 132 (e.g., using an S1 interface). The base station 102 configured for 5G NR (which may be collectively referred to as the Next Generation RAN (NG-RAN)) may interface with the 5GC 190 via a backhaul link 184. The base station 102 may perform one or more of the following functions, among other functions: transmission of user data, radio channel encryption and decryption, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity), inter-cell interference coordination, connection establishment and release, load balancing, distribution of non-access stratum (NAS) messages, NAS node selection, synchronization, radio access network (RAN) sharing, multimedia broadcast multicast service (MBMS), subscriber and equipment tracking, RAN information management (RIM), paging, positioning, and delivery of warning messages. Base stations 102 may communicate with each other directly or indirectly (e.g., through EPC 160 or 5GC 190) over backhaul link 134 (e.g., using an X2 interface). Backhaul link 134 may be wired or wireless.

[0035] The base station 102 may communicate wirelessly with one or more UEs 104. Each of the base stations 102 may provide communication coverage for a corresponding geographic coverage area 110. There may be overlapping geographic coverage areas 110. For example, a small cell 102' may have a coverage area 110' that overlaps with the coverage area 110 of one or more macro base stations 102. A network including both small cells and macro cells may be referred to as a heterogeneous network. A heterogeneous network may also include a home evolved Node B (eNB) (HeNB), which may provide services to a restricted group (which may be referred to as a closed subscriber group (CSG)). The communication link 120 between the base station 102 and the UE 104 may include an uplink (UL) (also referred to as a reverse link) transmission from the UE 104 to the base station 102 and / or a downlink (DL) (also referred to as a forward link) transmission from the base station 102 to the UE 104. The communication link 120 may use multiple-input multiple-output (MIMO) antenna technology, including spatial multiplexing, beamforming and / or transmit diversity. The communication link may be through one or more carriers. The base station 102 / UE 104 may use a spectrum of up to Y MHz (e.g., 5 MHz, 10 MHz, 15 MHz, 20 MHz, 100 MHz, 400 MHz, etc.) bandwidth per carrier allocated in a carrier aggregation of up to Yx MHz (e.g., corresponding to x component carriers) for transmission in the DL and / or UL directions. These carriers may or may not be adjacent to each other. The allocation of carriers may be asymmetric for DL ​​and UL (e.g., more or fewer carriers may be allocated for DL ​​than for UL). The component carrier may include a primary component carrier and one or more secondary component carriers. The primary component carrier may be referred to as a primary cell (PCell) and the secondary component carrier may be referred to as a secondary cell (SCell).

[0036] In another example, some UEs 104 may communicate with each other using a device-to-device (D2D) communication link 158. The D2D communication link 158 may use DL / UL WWAN spectrum. The D2D communication link 158 may use one or more sidelink channels, such as a physical sidelink broadcast channel (PSBCH), a physical sidelink discovery channel (PSDCH), a physical sidelink shared channel (PSSCH), and a physical sidelink control channel (PSCCH). The D2D communication may be through a variety of wireless D2D communication systems, such as, for example, FlashLinQ, WiMedia, Bluetooth, ZigBee, Wi-Fi based on IEEE 802.11 standards, LTE, or NR.

[0037] The wireless communication system may also include a Wi-Fi access point (AP) 150 that communicates with a Wi-Fi station (STA) 152 via a communication link 154 in the 5 GHz unlicensed spectrum. When communicating in the unlicensed spectrum, the STA 152 / AP 150 may perform a clear channel assessment (CCA) to determine whether the channel is available prior to communication.

[0038] The small cell 102' may operate in licensed and / or unlicensed spectrum. When operating in the unlicensed spectrum, the small cell 102' may employ NR and use the same 5 GHz unlicensed spectrum as the 5 GHz unlicensed spectrum used by the Wi-Fi AP 150. The small cell 102' employing NR in the unlicensed spectrum may improve the coverage of the access network and / or increase the capacity of the access network.

[0039] The base station 102 (whether a small cell 102' or a large cell (e.g., a macro base station)) may include an eNB, a gNodeB (gNB), or other types of base stations. Some base stations, such as gNB 180, may operate in traditional sub-6 GHz spectrum, millimeter wave (mmW) frequencies, and / or near mmW frequencies to communicate with UE 104. When the gNB 180 operates at mmW or near mmW frequencies, the gNB 180 may be referred to as a mmW base station. Extremely high frequency (EHF) is part of the RF in the electromagnetic spectrum. EHF has a range of 30 GHz to 300 GHz and a wavelength between 1 mm and 10 mm. The radio waves in this band may be referred to as millimeter waves. Near mmW can extend down to a frequency of 3 GHz with a wavelength of 100 mm. The super high frequency (SHF) band extends between 3 GHz and 30 GHz, which is also referred to as centimeter waves. Communications using the mmW / near mmW radio bands have extremely high path loss and short distances. The mmW base station 180 can use beamforming 182 with the UE 104 to compensate for the extremely high path loss and short distance. The base station 102 mentioned in this article can include a gNB 180.

[0040] The EPC 160 may include a mobility management entity (MME) 162, other MMEs 164, a serving gateway 166, a multimedia broadcast multicast service (MBMS) gateway 168, a broadcast multicast service center (BM-SC) 170, and a packet data network (PDN) gateway 172. The MME 162 may communicate with a home subscriber server (HSS) 174. The MME 162 is a control node that handles signaling between the UE 104 and the EPC 160. In general, the MME 162 provides bearer and connection management. All user Internet Protocol (IP) packets are transmitted through the serving gateway 166, which itself is connected to the PDN gateway 172. The PDN gateway 172 provides UE IP address allocation and other functions. The PDN gateway 172 and the BM-SC 170 are connected to IP services 176. The IP services 176 may include the Internet, an intranet, an IP multimedia subsystem (IMS), PS streaming services, and / or other IP services. The BM-SC 170 may provide functionality for MBMS user service configuration and delivery. The BM-SC 170 may serve as an entry point for content provider MBMS delivery, may be used to authorize and initiate MBMS bearer services in a public land mobile network (PLMN), and may be used to schedule MBMS delivery. The MBMS gateway 168 may be used to distribute MBMS services to base stations 102 belonging to a multicast broadcast single frequency network (MBSFN) area that broadcasts a specific service, and may be responsible for session management (start / stop) and for collecting eMBMS-related billing information.

[0041] 5GC 190 may include an access and mobility management function (AMF) 192, other AMFs 193, a session management function (SMF) 194, and a user plane function (UPF) 195. AMF 192 may communicate with a unified data management (UDM) 196. AMF 192 may be a control node that handles signaling between UE 104 and 5GC 190. Generally speaking, AMF 192 may provide QoS flow and session management. User Internet Protocol (IP) packets (e.g., from one or more UEs 104) may be transmitted through UPF 195. UPF 195 may provide UE IP address allocation and other functions for one or more UEs. UPF 195 is connected to IP services 197. IP services 197 may include the Internet, an intranet, an IP multimedia subsystem (IMS), a PS streaming service, and / or other IP services.

[0042] Base stations may also be referred to as gNBs, Node Bs, evolved Node Bs (eNBs), access points, base transceivers, radio base stations, radio transceivers, transceiver functions, basic service sets (BSSs), extended service sets (ESSs), transmit receive points (TRPs), or some other suitable terminology. Base station 102 provides an access point to EPC 160 or 5GC 190 for UE 104. Examples of UE 104 include cellular phones, smart phones, Session Initiation Protocol (SIP) phones, laptops, personal digital assistants (PDAs), satellite radios, global positioning systems, multimedia devices, video devices, digital audio players (e.g., MP3 players), cameras, game consoles, tablets, smart devices, wearable devices, vehicles, electric meters, gas pumps, large or small kitchen appliances, healthcare devices, implants, sensors / actuators, displays, or any other similarly functional devices. Some of UE 104 may be referred to as IoT devices (e.g., parking meters, gas pumps, toasters, vehicles, heart monitors, etc.). IoT UEs may include machine type communication (MTC) / enhanced MTC (eMTC, also referred to as Category (CAT)-M or Cat M1) UEs, NB-IoT (also referred to as CAT NB1) UEs, and other types of UEs. In the present disclosure, eMTC and NB-IoT may refer to future technologies that may evolve from or be based on these technologies. For example, eMTC may include FeMTC (further eMTC), eFeMTC (enhanced further eMTC), mMTC (massive MTC), etc., and NB-IoT may include eNB-IoT (enhanced NB-IoT), FeNB-IoT (further enhanced NB-IoT), etc. UE 104 may also be referred to as a station, a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terminology.

[0043] The deployment of a communication system (such as a 5G New Radio (NR) system) can be arranged with various components or components in a variety of ways. In a 5G NR system or network, a network node, a network entity, a mobility element of a network, a radio access network (RAN) node, a core network node, a network element or a network equipment (such as a base station (BS, e.g., BS102), or one or more units (or one or more components) that perform base station functionality can be implemented in an aggregated architecture or a decomposed architecture. For example, a BS (such as a Node B (NB), an evolved NB (eNB), an NR BS, a 5G NB, an access point (AP), a transmit receive point (TRP) or a cell, etc.) can be implemented as an aggregated base station (also referred to as an independent BS or a monolithic BS) or a decomposed base station.

[0044] A converged base station may be configured to utilize a radio protocol stack physically or logically integrated within a single RAN node. A decomposed base station may be configured to utilize a protocol stack physically or logically distributed between two or more units, such as one or more central or centralized units (CUs), one or more distributed units (Ds), or one or more radio units (RUs). In some aspects, a CU may be implemented within a RAN node, and one or more DUs may be co-located with the CU, or alternatively, may be geographically or virtually distributed in one or more other RAN nodes. A DU may be implemented to communicate with one or more RUs. Each of the CU, DU, and RU may also be implemented as a virtual unit, i.e., a virtual central unit (VCU), a virtual distributed unit (VDU), or a virtual radio unit (VRU).

[0045] Base station type operations or network designs may take into account the aggregated nature of base station functionality. For example, a disaggregated base station may be used in an integrated access backhaul (IAB) network, an open radio access network (O-RAN (network configurations such as those initiated by the O-RAN Alliance)), or a virtualized radio access network (vRAN, also known as a cloud radio access network (C-RAN)). Decomposition may include distributing functionality across two or more units at various physical locations, as well as virtually distributing functionality of at least one unit, which may enable flexibility in network design. Individual units of a disaggregated base station or disaggregated RAN architecture may be configured for wired or wireless communication with at least one other unit.

[0046] In one example, the BS communication component 442 may transmit spatial relationship information for virtual downlink beam resources and / or AoA / AoD channel characteristics, and / or the UE communication component 342 may receive the spatial relationship information. In this example, the UE 104 and / or the base station 102 may predict a downlink beam for communication between the UE 104 and the base station 102, and the UE 104 may derive a Tx spatial filter for transmitting an SRS corresponding to the predicted downlink beam. For example, the predicted downlink beam may be indicated as a virtual downlink beam resource that is not actually transmitted by the base station, or as an AoA / AoD associated with the channel characteristics between the UE 104 and the base station 102. In this example, the UE communication component 342 may obtain spatial relationship information associated with the virtual downlink beam resource or AoA / AoD, and may use the Tx spatial filter accordingly to transmit an SRS based on the spatial relationship information.

[0047] Figure 2 A diagram illustrating an example of a disaggregated base station 200 architecture is shown. The disaggregated base station 200 architecture may include one or more central units (CUs) 210 that may communicate directly with a core network 220 via a backhaul link, or indirectly with the core network 220 through one or more disaggregated base station units, such as a near real-time (near-RT) RAN intelligent controller (RIC) 225 via an E2 link, or a non-real-time (non-RT) RIC 215 associated with a service management and orchestration (SMO) framework 205, or both. The CU 210 may communicate with one or more distributed units (DUs) 230 via respective midhaul links, such as an F1 interface. The DU 230 may communicate with one or more radio units (RUs) 240 via respective fronthaul links. The RU 240 may communicate with respective UEs 104 via one or more radio frequency (RF) access links. In some implementations, a UE 104 may be served simultaneously by multiple RUs 240.

[0048] Each of the units (e.g., CU 210, DU 230, RU 240, and near-RT RIC 225, non-RT RIC 215, and SMO framework 205) 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 the communication interface of these units may be configured to communicate with one or more of the other units via a transmission medium. For example, these units may include a wired interface configured to receive or send signals to one or more of the other units via a wired transmission medium. In addition, the unit may include a wireless interface, which may include a receiver, a transmitter, or a transceiver (such as a radio frequency (RF) transceiver) configured to receive or send signals, or both, to one or more of the other units via a wireless transmission medium.

[0049] In some aspects, CU 210 may host one or more higher layer control functions. Such control functions may include radio resource control (RRC), packet data convergence protocol (PDCP), or service data adaptation protocol (SDAP), etc. Each control function may be implemented using an interface configured to communicate signals with other control functions hosted by CU 210. CU210 may be configured to handle user plane functionality (i.e., central unit-user plane (CU-UP)), control plane functionality (i.e., central unit-control plane (CU-CP)), or a combination thereof. In some specific implementations, CU 210 may be logically split into one or more CU-UP units and one or more CU-CP units. When implemented in an O-RAN configuration, the CU-UP unit may communicate bidirectionally with the CU-CP unit via an interface (such as an E1 interface). As needed, CU 210 may be implemented to communicate with DU 230 for network control and signal transmission.

[0050] DU 230 may correspond to a logical unit that includes one or more base station functions for controlling the operation of one or more RUs 240. In some aspects, DU 230 may host one or more of a radio link control (RLC) layer, a medium access control (MAC) layer, and one or more high physical (PHY) layers (such as modules for forward error correction (FEC) encoding and decoding, scrambling, modulation and demodulation, etc.) depending at least in part on functional splits such as those defined by the Third Generation Partnership Project (3GPP). In some aspects, DU 230 may further host one or more low PHY layers. Each layer (or module) may be implemented using an interface that is configured to communicate signals with other layers (and modules) hosted by DU 230 or with control functions hosted by CU 210.

[0051] The lower layer functionality may be implemented by one or more RUs 240. In some deployments, the RU 240 controlled by the DU 230 may correspond to a logical node that hosts RF processing functions or low PHY layer functions (such as performing Fast Fourier Transform (FFT), Inverse FFT (iFFT), digital beamforming or physical random access channel (PRACH) extraction and filtering, etc.), or both, based at least in part on a functional split (such as a lower layer functional split). In such an architecture, the RU 240 may be implemented to handle over-the-air (OTA) communications with one or more UEs 104. In some implementations, real-time and non-real-time aspects of control plane and user plane communications with the RU 240 may be controlled by the corresponding DU 230. In some scenarios, this configuration may enable the implementation of the DU 230 and the CU 210 in a cloud-based RAN architecture (such as a vRAN architecture).

[0052] The SMO framework 205 may be configured to support RAN deployment and provisioning of non-virtualized network elements and virtualized network elements. For non-virtualized network elements, the SMO framework 205 may be configured to support the deployment of dedicated physical resources for RAN coverage requirements, which may be managed via an operation and maintenance interface (such as an O1 interface). For virtualized network elements, the SMO framework 205 may be configured to interact with a cloud computing platform (such as an open cloud (O-Cloud) 290) to perform network element lifecycle management (such as to instantiate virtualized network elements) via a cloud computing platform interface (such as an O2 interface). Such virtualized network elements may include, but are not limited to, CU 210, DU 230, RU 240, and near-RT RIC 225. In some specific implementations, the SMO framework 205 may communicate with hardware aspects of the 4G RAN (such as an open eNB (O-eNB) 211) via the O1 interface. Additionally, in some specific implementations, the SMO framework 205 may communicate directly with one or more RUs 240 via the O1 interface. The SMO framework 205 may also include a non-RT RIC 215 configured to support the functionality of the SMO framework 205 .

[0053] The non-RT RIC 215 may be configured to include logic functions that enable 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 225. The non-RT RIC 215 may be coupled to or in communication with the near-RT RIC 225 (such as via an A1 interface). The near-RT RIC 225 may be configured to include logic functions that enable near-real-time control and optimization of RAN elements and resources via data collection and actions through an interface (such as via an E2 interface) that connects one or more CUs 210, one or more DUs 230, or both, and the O-eNB with the near-RT RIC 225.

[0054] In some implementations, in order to generate an AI / ML model to be deployed in the near-RT RIC 225, the non-RT RIC 215 may receive parameters or external enrichment information from an external server. Such information may be utilized by the near-RT RIC 225 and may be received from a non-network data source or from a network function at the SMO framework 205 or the non-RT RIC 215. In some examples, the non-RT RIC 215 or the near-RT RIC 225 may be configured to tune RAN behavior or performance. For example, the non-RT RIC 215 may monitor long-term trends and patterns of performance and employ AI / ML models to perform corrective actions through the SMO framework 205 (such as via reconfiguration of O1) or via the creation of RAN management policies (such as A1 policies).

[0055] In one example, as described herein, the BS communication component 442 can be implemented at least partially within the CU 210, and can send spatial relationship information, beam predictions, etc. to the UE via one or more DUs 230 and / or similar units. In another example, as described herein, the BS communication component 442 can be implemented at least partially within the DU 230, and can send spatial relationship information, beam predictions, etc. to the UE via one or more RUs 240 and / or similar units.

[0056] Now turn to Figures 3 to 8 , various aspects are described with reference to one or more components and one or more methods that can perform the actions or operations described herein, where aspects in dashed lines may be optional. Figure 5 and Figure 6 The operations described in the description are presented in a particular order and / or as being performed by example components, but it should be understood that the order of these actions and the components performing the actions may vary depending on the specific implementation. In addition, it should be understood that the following actions, functions, and / or components described may be performed by a specially programmed processor, a processor executing specially programmed software or computer-readable media, or any other combination of hardware components and / or software components capable of performing the described actions or functions.

[0057] refer to Figure 3 According to various aspects described herein, an example of a specific implementation of the UE 104 may include various components, some of which have been described above and will be further described herein, including components such as one or more processors 312 and memory 316 and a transceiver 302 that communicate via one or more buses 344, which can operate in conjunction with a modem 340 and / or a UE communication component 342 to receive spatial relationship information for virtual downlink beam resources or AoA / AoD associated with a channel.

[0058] In one aspect, the one or more processors 312 may include the modem 340 and / or may be part of the modem 340 using one or more modem processors. Thus, various functions associated with the UE communication component 342 may be included in the modem 340 and / or the processor 312, and in one aspect, may be performed by a single processor, while in other aspects, different ones of these functions may be performed by a combination of two or more different processors. For example, in one aspect, the one or more processors 312 may include a modem processor, or a baseband processor, or a digital signal processor, or a transmit processor, or a receiver processor, or any one or any combination of transceiver processors associated with the transceiver 302. In other aspects, some of the features of the one or more processors 312 and / or the modem 340 associated with the UE communication component 342 may be performed by the transceiver 302.

[0059] In addition, the memory 316 may be configured to store local versions of the data and / or applications 375 used herein, or one or more of the UE communication components 342 and / or its subcomponents executed by the at least one processor 312. The memory 316 may include any type of computer-readable medium that can be used by a computer or at least one processor 312, such as random access memory (RAM), read-only memory (ROM), tape, disk, optical disk, volatile memory, non-volatile memory, and any combination thereof. In one aspect, for example, when the UE 104 is operating at least one processor 312 to execute one or more of the UE communication components 342 and / or its subcomponents, the memory 316 may be a non-transitory computer-readable storage medium that stores one or more computer-executable codes and / or data associated therewith that define the UE communication components 342 and / or its subcomponents.

[0060] The transceiver 302 may include at least one receiver 306 and at least one transmitter 308. The receiver 306 may include hardware, firmware, and / or software code executable by a processor for receiving data, the code including instructions and stored in a memory (e.g., a computer-readable medium). The receiver 306 may be, for example, a radio frequency (RF) receiver. In one aspect, the receiver 306 may receive signals transmitted by at least one base station 102. Additionally, the receiver 306 may process such received signals and may also obtain measurements of these signals, such as but not limited to Ec / Io, signal-to-noise ratio (SNR), reference signal received power (RSRP), received signal strength indicator (RSSI), etc. The transmitter 308 may include hardware, firmware, and / or software code executable by a processor for transmitting data, the code including instructions and stored in a memory (e.g., a computer-readable medium). Suitable examples of the transmitter 308 may include, but are not limited to, an RF transmitter.

[0061] In addition, in an aspect, the UE 104 may include an RF front end 388 that may operate in communication with the one or more antennas 365 and the transceiver 302 to receive and transmit radio transmissions, such as wireless communications transmitted by at least one base station 102 or wireless transmissions transmitted by the UE 104. The RF front end 388 may be connected to the one or more antennas 365 and may include one or more low noise amplifiers (LNAs) 390, one or more switches 392, one or more power amplifiers (PAs) 398, and one or more filters 396 for transmitting and receiving RF signals.

[0062] In one aspect, the LNA 390 can amplify the received signal at a desired output level. In one aspect, each LNA 390 can have a specified minimum gain value and a maximum gain value. In one aspect, the RF front end 388 can use one or more switches 392 to select a particular LNA 390 and its specified gain value based on the desired gain value for a particular application.

[0063] In addition, for example, the RF front end 388 can use one or more PAs 398 to amplify the signal for RF output at a desired output power level. In one aspect, each PA 398 can have a specified minimum gain value and a maximum gain value. In one aspect, the RF front end 388 can use one or more switches 392 to select a particular PA 398 and its specified gain value based on a desired gain value for a particular application.

[0064] In addition, for example, the RF front end 388 can use one or more filters 396 to filter the received signal to obtain an input RF signal. Similarly, in one aspect, for example, the output from the corresponding PA 398 can be filtered using a corresponding filter 396 to produce an output signal for transmission. In one aspect, each filter 396 can be connected to a specific LNA 390 and / or PA 398. In one aspect, the RF front end 388 can use one or more switches 392 to select a transmit path or a receive path using a specified filter 396, LNA 390, and / or PA 398 based on a configuration as specified by the transceiver 302 and / or the processor 312.

[0065] Thus, the transceiver 302 can be configured to transmit and receive wireless signals through one or more antennas 365 via the RF front end 388. In one aspect, the transceiver can be tuned to operate at a specified frequency so that the UE 104 can communicate with, for example, one or more base stations 102 or one or more cells associated with one or more base stations 102. In one aspect, for example, the modem 340 can configure the transceiver 302 to operate at a specified frequency and power level based on a UE configuration of the UE 104 and a communication protocol used by the modem 340.

[0066] In one aspect, the modem 340 may be a multi-band multi-mode modem that processes digital data and communicates with the transceiver 302 so that the digital data is transmitted and received using the transceiver 302. In one aspect, the modem 340 may be multi-band and configured to support multiple frequency bands for a specific communication protocol. In one aspect, the modem 340 may be multi-mode and configured to support multiple operating networks and communication protocols. In one aspect, the modem 340 may control one or more components (e.g., RF front end 388, transceiver 302) of the UE 104 to enable the sending and / or receiving of signals from the network based on a specified modem configuration. In one aspect, the modem configuration may be based on the mode of the modem and the frequency band used. In another aspect, the modem configuration may be based on UE configuration information associated with the UE 104 as provided by the network during cell selection and / or cell reselection.

[0067] In one aspect, according to the aspects described herein, the UE communication component 342 may optionally include: a configuration processing component 352 for receiving and / or processing configuration of spatial relationship information indicating AoA / AoD channel characteristics for a virtual downlink beam resource or a channel with a base station; an SRS component 354 for sending an SRS based on the spatial relationship information; and / or a beam prediction component 356 for predicting a downlink beam to be used when communicating with a network node.

[0068] In one aspect, processor 312 may correspond to combining Figure 8 Similarly, the memory 316 may correspond to one or more processors in conjunction with the UE described in the embodiment of the present invention. Figure 8 The memory described by the UE in.

[0069] refer to Figure 4 According to various aspects described herein, an example of a specific implementation of a base station 102 (e.g., base station 102 and / or gNB 180 as described above) may include various components, some of which have been described above, but include components such as one or more processors 412 and memory 416 and a transceiver 402 that communicate via one or more buses 444, which can operate in conjunction with a modem 440 and a BS communication component 442 to configure spatial relationship information for virtual downlink beam resources or AoA / AoD associated with a channel.

[0070] The transceiver 402, receiver 406, transmitter 408, one or more processors 412, memory 416, applications 475, bus 444, RF front end 488, LNA 490, switch 492, filter 496, PA 498 and one or more antennas 465 may be the same or similar to the corresponding components of UE 104 described above, but are configured or otherwise programmed for base station operation rather than UE operation.

[0071] In one aspect, in accordance with the aspects described herein, the BS communication component 442 may optionally include: a configuration component 452 for generating and / or sending a configuration indicating spatial relationship information for a virtual downlink beam resource or an AoA / AoD channel characteristic of a channel with the UE 104; and / or a beam prediction component 454 for predicting a downlink beam to be used when communicating with the UE 104.

[0072] In one aspect, processor 412 may correspond to combining Figure 8 Similarly, the memory 416 may correspond to one or more processors in conjunction with the base station described in the embodiment of the present invention. Figure 8The memory described in the base station.

[0073] Figure 5 A flow chart illustrating an example of a method 500 for receiving and using spatial relationship information for a virtual downlink beam resource or AoA / AoD associated with a channel in accordance with various aspects described herein. Figure 6 A flowchart illustrating a method 600 for configuring spatial relationship information for a virtual downlink beam resource or AoA / AoD associated with a channel in accordance with various aspects described herein. In one example, a UE 104 may use Figure 1 and Figure 3 One or more of the components described in the method 500 may be used to perform the functions described in the method 500. In an example, a base station 102 (e.g., a gNB, a single-chip base station, or a portion of a decomposed base station, etc.) may use Figure 1 and Figure 4 One or more of the components described in the method 600 may be used to perform the functions described in the method 600. For ease of explanation, the methods 500 and 600 are described in conjunction with each other; however, the methods 500 and 600 need not be performed together and may in fact be performed independently using separate devices.

[0074] In the method 600, at block 602, a configuration indicating spatial relationship information associated with a virtual downlink beam resource or an AoA / AoD associated with a channel between the UE and a network node may be sent for a UE. In one aspect, a configuration component 452 (e.g., in conjunction with the processor 412, the memory 416, the transceiver 402, the BS communication component 442, etc.) may send a configuration indicating spatial relationship information associated with a virtual downlink beam resource or an AoA / AoD associated with a channel between the UE and a network node for a UE (e.g., the UE 104). For example, the configuration component 452 may send the configuration in a radio resource control (RRC) signaling, a medium access control-control element (MAC-CE), a downlink control information (DCI), etc.

[0075] In the method 500, at block 502, a configuration indicating spatial relationship information associated with a virtual downlink beam resource or an AoA / AoD associated with a channel between a UE and the network node may be received from a network node. In one aspect, the configuration processing component 352 (e.g., in conjunction with the processor 312, the memory 316, the transceiver 302, the UE signaling component 342, etc.) may receive a configuration indicating spatial relationship information associated with a virtual downlink beam resource or an AoA / AoD associated with a channel between a UE and the network node from a network node (e.g., a base station 102).

[0076] As described, in one example, the configuration component 452 may send the spatial relationship information in RRC signaling, and / or the configuration processing component 352 may receive the spatial relationship information in RRC signaling. In one example, in the RRC signaling, an information element (IE) for indicating the spatial relationship information, such as the SRS-SpatialRelationInfo IE defined in 5G NR, may be used to convey the spatial relationship information. In this example, the SRS-SpatialRelationInfo IE may be extended to allow for the specification of spatial relationship information for downlink reference signals, which may include virtual downlink beam resources, AoA / AoD of channels, etc., wherein the virtual downlink beam resources, AoA / AoD of channels, etc. may be predicted and / or reported by the UE 104, indicated by the network node as a downlink beam prediction result, indicated by the UE 104 as a recommendation for a new uplink beam (which may be based on recommending a predicted downlink beam by indicating the virtual downlink beam resources, AoA / AoD of channels, etc.), etc.

[0077] In one example, the configuration may assign a virtual resource or AoA / AoD-based spatial relationship for the SRS resource, which may be configured at the SRS resource level (e.g., each SRS resource). For example, the UE 104 may also be configured by the network node with an SRS resource for sending the SRS to the network node. The SRS-SpatialRelationInfo may be associated with the SRS resource and may be indicated as at least one of: 1) a virtual resource that is not actually sent by the network node, but may be predicted and reported by the UE 104 (e.g., via a channel state information (CSI) report), or indicated by the network node as a beam prediction result; or 2) AoA / AoD associated with the channel characteristics between the UE 104 and the network node, where the AoA / AoD may be reported by the UE 104 or indicated by the network node as a spatial beam prediction result. In one example, the configuration may include an identifier associated with a virtual resource or with an AoA / AoD characteristic, such that given an identifier of a virtual resource or AoA / AoD received in beam prediction (e.g., at UE 104 or from a network node), the configuration processing component 352 may derive spatial relationship information from the configuration. In another example, the configuration may assign a spatial relationship based on a virtual resource or AoA / AoD for a set of multiple SRS resources (e.g., each SRS resource set). In one example, this may be conditional on a usage parameter for a configuration of an SRS resource set being non-codebook or a new usage type for an SRS resource set.

[0078] In the method 500, at block 504, an SRS based on at least one of a virtual downlink beam resource or an AoA / AoD associated with a channel and according to the spatial relationship information may be sent to a network node. In one aspect, the SRS component 354 (e.g., in conjunction with the processor 312, the memory 316, the transceiver 302, the UE communication component 342, etc.) may send an SRS based on at least one of a virtual downlink beam resource or an AoA / AoD associated with a channel and according to the spatial relationship information to the network node. For example, the SRS component 354 may derive a spatial domain Tx filter for sending an SRS resource based on a (predicted) Rx spatial filter for receiving a quantity configured in an associated configuration (e.g., in an SRS-SpatialRelationInfo IE).

[0079] In the method 600, at block 604, an SRS based on at least one of the virtual downlink beam resources or the AoA / AoD associated with the channel and according to the spatial relationship information may be received for the UE. In an aspect, the BS communication component 442 (e.g., in conjunction with the processor 412, the memory 416, the transceiver 402, etc.) may receive, for the UE (e.g., the UE 104), an SRS based on at least one of the virtual downlink beam resources or the AoA / AoD associated with the channel and according to the spatial relationship information.

[0080] As described, in one example, the UE may perform beam prediction to predict a downlink beam or a corresponding uplink beam. For example, as described above, the UE communication component 342 may use AI / ML-based beam prediction to predict the beam. For example, using SD prediction, the UE communication component 342 may predict one or more beams having a second narrower width based on measurements of one or more beams having a first width. In another example, using TD prediction (and / or SD prediction), the UE communication component 342 may predict the next beam of the UE based on the location or change in location of the UE, the speed or direction of movement of the UE, etc. and based on the current beam of the UE. In yet another example, the UE communication component 342 may predict a beam for the UE based on the original channel extraction. In one example, the network node may perform beam prediction to predict a downlink beam for the UE based on similar considerations or measurements of the UE, and / or may indicate the predicted beam to the UE by indicating a virtual downlink beam resource identifier, an AoA / AoD channel characteristic (or an associated identifier), etc.

[0081] In one example, in the method 500, optionally at block 506, a beam prediction result regarding a virtual downlink beam resource or regarding an AoA / AoD associated with a channel may be reported to a network node. In one aspect, the beam prediction component 356 (e.g., in conjunction with the processor 312, the memory 316, the transceiver 302, the UE communication component 342, etc.) may report a beam prediction result regarding a virtual downlink beam resource or regarding an AoA / AoD associated with a channel to a network node (e.g., the base station 102). For example, the beam prediction component 356 may predict a downlink beam from a first set of narrower beams using SD prediction based on measurements of a second set of a smaller number of wide beams. In another example, the beam prediction component 356 may predict a downlink beam based on a current beam and a mobile parameter of the UE 104 (such as speed, direction, etc.), a current location of the UE 104, etc. In such an example, the beam prediction component 356 may obtain a virtual downlink beam resource or an associated identifier for the predicted downlink beam. In this example, the SRS component 354 can obtain spatial relationship information from the configuration based on the virtual downlink beam resource or the associated identifier, as indicated in the configuration. In addition, for example, the beam prediction component 356 can report the beam prediction result to the network node, which can include reporting the virtual downlink beam resource or the associated identifier to the network node (e.g., together with the SRS, in uplink control signaling, etc.).

[0082] In another example, the beam prediction component 356 can discern the AoA / AoD characteristics of the channel with the network node, and the SRS component 354 can obtain spatial relationship information from the configuration based on the AoA / AoD characteristics of the channel, as indicated in the configuration. Additionally, for example, the beam prediction component 356 can report the AoA / AoD characteristics to the network node (e.g., with the SRS, in uplink control signaling, etc.). The SRS component 354 can configure a beam for sending SRS, for receiving downlink communications from the network node, for sending uplink communications to the network node, etc.

[0083] In an example, in the method 600, optionally at block 606, a beam prediction result regarding a virtual downlink beam resource or regarding an AoA / AoD associated with a channel may be received for the UE. In one aspect, the beam prediction component 454 (e.g., in conjunction with the processor 412, the memory 416, the transceiver 402, the BS communication component 442, etc.) may receive a beam prediction result regarding a virtual downlink beam resource or regarding an AoA / AoD associated with a channel for the UE. For example, the beam prediction component 454 may receive the beam prediction result along with an SRS, in uplink control signaling, etc. The beam prediction component 454 may use the beam prediction result to configure a beam for communicating with the UE 104, such as to receive an SRS from the UE 104, to send downlink communications to the UE 104, to receive uplink communications from the UE 104, etc.

[0084] In another example, in the method 600, optionally at block 608, beam prediction results regarding virtual downlink beam resources or regarding AoA / AoD associated with a channel may be reported for the UE. In one aspect, the beam prediction component 454 (e.g., in conjunction with the processor 412, the memory 416, the transceiver 402, the BS communication component 442, etc.) may report beam prediction results regarding virtual downlink beam resources or regarding AoA / AoD associated with a channel for the UE. For example, the beam prediction component 454 may predict a downlink beam from a first set of narrower beams using SD prediction based on received measurements of a second set of a smaller number of wide beams. In another example, the beam prediction component 454 may predict a downlink beam based on a current beam and a mobile parameter of the UE 104 (such as speed, direction, etc.), a current location of the UE 104, etc. In such examples, beam prediction component 454 can obtain a virtual downlink beam resource or an associated identifier for the predicted downlink beam, which BS communication component 442 can use when communicating with UE 104. Additionally, for example, beam prediction component 454 can report the beam prediction result to UE 104, which can include reporting the virtual downlink beam resource or the associated identifier to UE 104 (e.g., in a MAC-CE, DCI, etc.).

[0085] In another example, beam prediction component 454 can discern AoA / AoD characteristics of a channel with UE 104, and BS communication component 442 can use beams associated with the AoA / AoD characteristics of the channel to communicate with UE 104. Additionally, for example, beam prediction component 454 can report the AoA / AoD characteristics to the UE (e.g., in a MAC-CE, DCI, etc.).

[0086] In one example, in method 500, optionally at block 508, a beam prediction result regarding a virtual downlink beam resource or regarding an AoA / AoD associated with a channel may be received from a network node. In one aspect, the beam prediction component 356 (e.g., in conjunction with the processor 312, the memory 316, the transceiver 302, the UE communication component 342, etc.) may receive a beam prediction result regarding a virtual downlink beam resource or regarding an AoA / AoD associated with a channel from a network node. The SRS component 354 may obtain spatial relationship information for the beam prediction result (e.g., based on the virtual downlink beam resource or an associated identifier, AoA / AoD characteristics, etc.), and may use a spatial Tx filter to send an SRS based on the spatial relationship information, as described.

[0087] In one example, in method 500, optionally at block 510, an uplink beam recommendation based on the downlink beam prediction may be sent. In one aspect, beam prediction component 356 (e.g., in conjunction with processor 312, memory 316, transceiver 302, UE communication component 342, etc.) may send an uplink beam recommendation based on the downlink beam prediction. For example, beam prediction component 356 may receive downlink beam predictions for multiple downlink beams from a network node (e.g., at block 508). In one example, beam prediction component 356 may transmit an uplink beam recommendation to the network node, which may be one of the downlink beam predictions that beam prediction component 356 may select. In one example, SRS component 354 may send an SRS based on the uplink beam recommendation.

[0088] In one specific example, in the method 500, optionally at block 512, a maximum permissible exposure (MPE) can be detected. In one aspect, the UE communication component 342 (e.g., in conjunction with the processor 312, the memory 316, the transceiver 302, etc.) can detect the MPE at the UE 104, which can include detecting a power or radiation above a threshold. For example, based on detecting the MPE (e.g., an MPE event), the beam prediction component 356 can provide an uplink beam recommendation to the network node, wherein the uplink beam can mitigate the MPE at the UE 104.

[0089] In one example, in method 600, optionally at box 610, an uplink beam recommendation based on the downlink beam prediction may be received. In one aspect, beam prediction component 454 (e.g., in conjunction with processor 412, memory 416, transceiver 402, BS communication component 442, etc.) may receive an uplink beam recommendation based on the downlink beam prediction. For example, beam prediction component 454 may send downlink beam predictions for multiple downlink beams to the UE (e.g., at box 608). In one example, beam prediction component 454 may receive an uplink beam recommendation from UE 104, which may be one of the downlink beam predictions. In one example, BS communication component 442 may receive an SRS based on the uplink beam recommendation. In Figure 7 An example is shown in .

[0090] Figure 7 An example of a system 700 for transmitting uplink beam recommendations based on downlink beam prediction according to various aspects described herein is illustrated. The system 700 includes a UE 104 that can communicate with a gNB 704. In an example, at 706, the gNB 704 can send a set B beam for downlink beam prediction to the UE 104, and at 708, the UE 104 can send a preferred set A beam as a beam prediction result to the gNB 704, which beam prediction results can include a virtual resource identifier or an AoA / AoD characteristic. In an example, the set A of preferred beams can be a subset of the set B of beams. For example, the UE 104 can measure the set B beams, or can determine or otherwise predict the set A beam as a next beam for the UE 104 based on the set B beams. In one example, at 710, the gNB 704 may send downlink beam prediction results to the UE 104, and the downlink beam prediction results may include a virtual resource identifier or an AoA / AoD characteristic. For example, the gNB 704 may provide prediction result information for the set A of preferred beams, such as a virtual resource identifier or an AoA / AoD characteristic, or may select or indicate a subset of downlink beam prediction results, etc.

[0091] In an example, UE 104 may send an uplink beam recommendation report (e.g., at 714 or 716) to gNB 704. For example, UE 104 may recommend a new UL beam to gNB 704, where the recommendation may be based on indicating at least one of: 1) a virtual resource that is not actually sent by gNB 704 but may be predicted and reported by UE 104 (e.g., via CSI report) or indicated by gNB 704 as a beam prediction result; or 2) AoA / AoD associated with a channel characteristic between UE 104 and gNB 704, where AoA / AoD may be reported by UE 104 or indicated by gNB 704 as a spatial beam prediction result.

[0092] In one example, providing an uplink beam recommendation may be conditional on an MPE. For example, UE 104 may send an uplink beam recommendation report (e.g., at 714 or 716) conditioned on the UE having recently reported a power headroom (PHR) MAC-CE carrying a power management-maximum power reduction (P-MPR) item. In one example, UE 104 may send an uplink beam recommendation report at 714 after sending a PHR carrying an M-MPR item at 712 (e.g., and / or after a predefined timer). The reported uplink beam recommendation may be carried by a MAC-CE, a DCI, or the like. In another example, at 716, UE 104 may send a PHR MAC-CE carrying a P-MPR item and also carrying an uplink beam recommendation report.

[0093] Figure 8 1 is a block diagram of a MIMO communication system 800 including a base station 102 and a UE 104. The MIMO communication system 800 may be exemplified with reference to Figure 1 The wireless communication access network 100 described herein may include various aspects of the wireless communication access network 100. The base station 102 may be a reference Figure 1 Examples of various aspects of base station 102 are described. Base station 102 can be equipped with antenna 834 and antenna 835, and UE 104 can be equipped with antenna 852 and antenna 853. In MIMO communication system 800, base station 102 can be able to transmit data over multiple communication links simultaneously. Each communication link can be referred to as a "layer", and the "rank" of a communication link can indicate the number of layers used for communication. For example, in a 2x2 MIMO communication system in which base station 102 sends two "layers", the rank of the communication link between base station 102 and UE 104 is two.

[0094] At the base station 102, a transmit (Tx) processor 820 may receive data from a data source. The transmit processor 820 may process data. The transmit processor 820 may also generate control symbols or reference symbols. The transmit MIMO processor 830 may perform spatial processing (e.g., pre-decoding) on ​​data symbols, control symbols, or reference symbols (if applicable), and may provide an output symbol stream to a transmit modulator / demodulator 832 and a modulator / demodulator 833. Each modulator / demodulator 832 to a modulator / demodulator 833 may process a corresponding output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator / demodulator 832 to a modulator / demodulator 833 may further process the output sample stream (e.g., convert the output sample stream into analog, amplify, filter, and up-convert) to obtain a DL signal. In an example, the DL signals from the modulator / demodulator 832 and the modulator / demodulator 833 may be transmitted via antenna 834 and antenna 835, respectively.

[0095] UE 104 may be a reference Figure 1 and Figure 3 Examples of various aspects of the UE 104 described herein. At the UE 104, the UE antenna 852 and the antenna 853 can receive DL signals from the base station 102 and can provide received signals to the modulator / demodulator 854 and the modulator / demodulator 855, respectively. Each modulator / demodulator 854 to the modulator / demodulator 855 can condition the corresponding received signal (e.g., filter, amplify, downconvert, and digitize the corresponding received signal) to obtain input samples. Each modulator / demodulator 854 to the modulator / demodulator 855 can further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. The MIMO detector 856 can obtain received symbols from the modulator / demodulator 854 and the modulator / demodulator 855, perform MIMO detection on the received symbols (if applicable), and provide detected symbols. The receive (Rx) processor 858 may process (eg, demodulate, deinterleave, and decode) the detected symbols to provide decoded data for the UE 104 to a data output and to provide decoded control information to a processor 880 or memory 882 .

[0096] In some cases, processor 880 may execute stored instructions to cause UE communication component 342 (see, e.g., Figure 1 and Figure 3 ) instantiated.

[0097] On the uplink (UL), at the UE 104, a transmit processor 864 may receive and process data from a data source. The transmit processor 864 may also generate reference symbols for reference signals. The symbols from the transmit processor 864 may be pre-decoded by a transmit MIMO processor 866 (if applicable), further processed by the modulator / demodulator 854 and the modulator / demodulator 855 (e.g., for single carrier FDMA, etc.), and transmitted to the base station 102 according to the communication parameters received from the base station 102. At the base station 102, the UL signal from the UE 104 may be received by the antennas 834 and 835, processed by the modulator / demodulator 832 and the modulator / demodulator 833, detected by the MIMO detector 836 (if applicable), and further processed by the receive processor 838. The receive processor 838 may provide decoded data to a data output and the processor 840 or the memory 842.

[0098] In some cases, processor 840 may execute stored instructions to cause BS communication component 442 (see, e.g., Figure 1 and Figure 4 ) instantiated.

[0099] The components of the UE 104 may be implemented individually or collectively using one or more ASICs, wherein the one or more ASICs are adapted to perform some or all of the applicable functions in hardware. Each of the modules indicated may be a component for performing one or more functions related to the operation of the MIMO communication system 800. Similarly, the components of the base station 102 may be implemented individually or collectively using one or more application specific integrated circuits (ASICs), which are adapted to perform some or all of the applicable functions in hardware. Each of the components indicated may be a component for performing one or more functions related to the operation of the MIMO communication system 800.

[0100] The following aspects are merely illustrative, and aspects thereof may be combined with aspects of other embodiments or teachings described herein without limitation.

[0101] Aspect 1 is a method for wireless communication at a UE, comprising: receiving a configuration indicating spatial relationship information associated with at least one of: a virtual downlink beam resource; or an AoA or AoD associated with a channel between the UE and the network node from a network node, and sending an SRS to the network node, the SRS being based on the virtual downlink beam resource or at least one of the AoA or AoD associated with the channel and in accordance with the spatial relationship information.

[0102] In aspect 2, the method according to aspect 1 includes: wherein the configuration indicates the spatial relationship information of each SRS resource.

[0103] In aspect 3, the method according to aspect 2 includes: reporting a beam prediction result about the virtual downlink beam resource to the network node, wherein sending the SRS includes: sending the SRS based on the virtual downlink beam resource and according to the spatial relationship information specified in the configuration for the virtual downlink beam resource.

[0104] In aspect 4, the method according to any one of aspects 2 or 3 includes: receiving a beam prediction result about the virtual downlink beam resource from the network node, wherein sending the SRS includes: sending the SRS based on the virtual downlink beam resource and according to the spatial relationship information specified in the configuration for the virtual downlink beam resource.

[0105] In aspect 5, the method according to any one of aspects 2 to 4 includes: reporting to the network node a beam prediction result about the AoA or AoD associated with the channel, wherein sending the SRS includes: sending the SRS based on the virtual downlink beam resources and according to the spatial relationship information specified in the configuration for the AoA or AoD associated with the channel.

[0106] In aspect 6, the method according to any one of aspects 2 to 5 includes: receiving a beam prediction result about the AoA or AoD associated with the channel from the network node, wherein sending the SRS includes: sending the SRS based on the virtual downlink beam resources and according to the spatial relationship information specified in the configuration for the AoA or AoD associated with the channel.

[0107] In aspect 7, the method according to any one of aspects 1 to 6 includes: wherein the configuring indicates the spatial relationship information of each SRS resource set of a plurality of SRS resources.

[0108] In aspect 8, the method according to aspect 7 includes: wherein sending the SRS based on the virtual downlink beam resource or at least one of the AoA or AoD associated with the channel is based on a usage indication non-codebook configured for the SRS resource set.

[0109] In aspect 9, the method according to any one of aspects 7 or 8 includes: wherein sending the SRS based on at least one of the AoA or AoD associated with the virtual downlink beam resource or the channel indicates the type of use of the virtual downlink beam resource or the AoA or AoD associated with the channel based on a usage indication configured for the SRS resource set.

[0110] In aspect 10, the method according to any one of aspects 1 to 9 includes: sending an uplink beam recommendation based on downlink beam prediction to the network node, wherein the uplink beam recommendation includes the virtual downlink beam resource or one of the AoA or AoD associated with the channel.

[0111] In aspect 11, the method according to aspect 10 includes: wherein sending the uplink beam recommendation is based on detecting an MPE event at the UE.

[0112] In aspect 12, the method according to aspect 11 includes: wherein detecting the MPE event is based on detecting the transmission of a PHR MAC-CE with a P-MPR item at the UE and within a time period before the transmission of the uplink beam recommendation.

[0113] In aspect 13, the method according to any one of aspects 11 or 12 includes: wherein sending the uplink beam recommendation is in a MAC-CE or a DCI.

[0114] Aspect 14 is a method for wireless communication at a network node, comprising: sending a configuration indicating spatial relationship information associated with at least one of the following to a UE: a virtual downlink beam resource; or an AoA or AoD associated with a channel between the UE and the network node, and receiving an SRS to the UE, the SRS being based on the virtual downlink beam resource or at least one of the AoA or AoD associated with the channel and according to the spatial relationship information.

[0115] In aspect 15, the method according to aspect 14 includes: wherein the configuration indicates the spatial relationship information of each SRS resource.

[0116] In aspect 16, the method according to aspect 15 includes: receiving a beam prediction result about the virtual downlink beam resource for the UE, wherein receiving the SRS includes: receiving the SRS based on the virtual downlink beam resource and according to the spatial relationship information specified in the configuration for the virtual downlink beam resource.

[0117] In aspect 17, the method according to any one of aspects 15 or 16 includes: sending a beam prediction result about the virtual downlink beam resource to the UE, wherein receiving the SRS includes: receiving the SRS based on the virtual downlink beam resource and according to the spatial relationship information specified in the configuration for the virtual downlink beam resource.

[0118] In aspect 18, the method according to any one of aspects 15 to 17 includes: receiving, for the UE, a beam prediction result regarding the AoA or AoD associated with the channel, wherein receiving the SRS includes: receiving the SRS based on the virtual downlink beam resources and according to the spatial relationship information specified in the configuration for the AoA or AoD associated with the channel.

[0119] In aspect 19, the method according to any one of aspects 15 to 18 includes: sending a beam prediction result about the AoA or AoD associated with the channel to the UE, wherein receiving the SRS includes: receiving the SRS based on the virtual downlink beam resources and according to the spatial relationship information specified in the configuration for the AoA or AoD associated with the channel.

[0120] In aspect 20, the method according to any one of aspects 14 to 19 comprises: wherein the configuring indicates the spatial relationship information of each SRS resource set of a plurality of SRS resources.

[0121] In aspect 21, the method according to aspect 20 includes: wherein receiving the SRS based on the virtual downlink beam resource or at least one of the AoA or AoD associated with the channel is based on a usage indication non-codebook for the configuration of the SRS resource set.

[0122] In aspect 22, the method according to any one of aspects 20 or 21 includes: wherein receiving the SRS based on at least one of the virtual downlink beam resources or the AoA or AoD associated with the channel indicates a usage type for the virtual downlink beam resources or the AoA or AoD associated with the channel based on a usage indication configured for the SRS resource set.

[0123] In aspect 23, the method according to any one of aspects 14 to 22 includes: receiving an uplink beam recommendation based on downlink beam prediction for the UE, wherein the uplink beam recommendation includes the virtual downlink beam resource or one of the AoA or AoD associated with the channel.

[0124] In aspect 24, the method according to aspect 23 includes: wherein receiving the uplink beam recommendation is based on an MPE event at the UE.

[0125] In aspect 25, the method according to any one of aspects 23 or 24 includes: wherein receiving the uplink beam recommendation is in a MAC-CE or a DCI.

[0126] Aspect 26 is an apparatus for wireless communication, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to perform any of the methods described in aspects 1 to 25.

[0127] Aspect 27 is an apparatus for wireless communication, comprising: means for performing any of the methods according to aspects 1 to 25.

[0128] Aspect 28 is a computer readable medium comprising code executable by one or more processors for wireless communication, the code comprising code for performing any of the methods according to aspects 1 to 25.

[0129] The above specific embodiments described above in conjunction with the accompanying drawings describe examples and do not represent the only examples that can be implemented or fall within the scope of the claims. The term "example" used in this specification means "used as an example, instance, or illustration", rather than "preferred" or "advantageous over other examples". The specific embodiments include specific details for providing an understanding of the described techniques. However, these techniques can be practiced without these specific details. In some instances, well-known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described examples.

[0130] Information and signals may be represented using any of a variety of different technologies and techniques. For example, the data, instructions, commands, information, signals, bits, symbols, and chips mentioned in the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or particles, optical fields or particles, computer executable codes or instructions stored on a computer-readable medium, or any combination thereof.

[0131] The various illustrative blocks and components described in conjunction with the disclosure herein may be implemented or executed using a specially programmed device, such as, but not limited to, a processor for performing the functions described herein, a digital signal processor (DSP), an ASIC, a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic components, discrete hardware components, or any combination thereof. Although the specially programmed processor may be a microprocessor, in an alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. The specially programmed processor may also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

[0132] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented with software executed by a processor, the functions may be stored as one or more instructions or codes on a non-transient computer-readable medium or sent through it. Other examples and specific implementations fall within the scope and essence of the present disclosure and the appended claims. For example, due to the nature of software, the functions described above may be implemented using hardware, firmware, hard wiring, software executed by a specially programmed processor, or a combination of any of these items. The features that implement the functions may also be physically located at different locations, including being distributed so that the various parts of the functions are implemented at different physical locations. In addition, as used herein, included in the claims, as used in the list of entries started by "at least one of" "or" indicates a dispersed list, so that, for example, a list of "at least one of A, B, or C" means A or B or C or AB or AC or BC or ABC (i.e., A and B and C).

[0133] Computer readable medium includes both computer storage medium and communication medium, and this communication medium includes any medium that promotes computer program to be transferred from one place to another place.Storage medium can be any available medium that can be accessed by general or special-purpose computer.By way of example and not limitation, computer readable medium can include RAM, ROM, EEPROM, CD-ROM or other optical disk storage device, magnetic disk storage device or other magnetic storage device, or can be used for carrying or storing desired program code parts and any other medium that can be accessed by general or special-purpose computer or general or special-purpose processor in the form of instruction or data structure.In addition, any connection is appropriately referred to as computer readable medium.For example, if software is to send from website, server or other remote source using coaxial cable, optical fiber cable, twisted pair, digital subscriber line (DSL) or wireless technology such as infrared, radio and microwave, then coaxial cable, optical fiber cable, twisted pair, DSL or wireless technology such as infrared, radio and microwave are included in the definition of medium. As used herein, disk and disc include compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc, wherein disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer readable media.

[0134] The previous description of the present disclosure is provided to enable those skilled in the art to implement or use the present disclosure. It will be apparent to those of ordinary skill in the art that various modifications to the present disclosure will be apparent, and the general principles defined herein may be applied to other variations without departing from the essence or scope of the present disclosure. In addition, although the elements of the described aspects and / or embodiments are described or claimed in the singular, the plural form may also be envisioned unless explicitly stated to be limited to the singular. Additionally, unless otherwise stated, all or part of any aspect and / or embodiment may be used together with all or part of any other aspect and / or embodiment. Therefore, the present disclosure is not limited to the examples and designs described herein, but should be granted the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for wireless communication, comprising: processor; a memory coupled to the processor; and instructions stored in the memory and operable when executed by the processor to cause the apparatus to: Receiving, from a network node, a configuration indicating spatial relationship information associated with at least one of: Virtual downlink beam resources; or an angle of arrival (AoA) or angle of departure (AoD) associated with a channel between the device and the network node; and A sounding reference signal (SRS) is sent to the network node, the sounding reference signal (SRS) being based on the virtual downlink beam resource or at least one of the AoA or AoD associated with the channel and in accordance with the spatial relationship information. The apparatus according to claim 1 , wherein the configuration indicates the spatial relationship information of each SRS resource.

3. An apparatus according to claim 2, wherein the instructions, when executed by the processor, are capable of operating so that the apparatus reports beam prediction results about the virtual downlink beam resource to the network node, wherein the instructions, when executed by the processor, are capable of operating so that the apparatus sends the SRS, the SRS being based on the virtual downlink beam resource and according to the spatial relationship information specified in the configuration for the virtual downlink beam resource.

4. An apparatus according to claim 2, wherein the instructions, when executed by the processor, are capable of operating so that the apparatus receives a beam prediction result regarding the virtual downlink beam resource from the network node, wherein the instructions, when executed by the processor, are capable of operating so that the apparatus sends the SRS, the SRS being based on the virtual downlink beam resource and according to the spatial relationship information specified in the configuration for the virtual downlink beam resource.

5. The apparatus of claim 2, wherein the instructions, when executed by the processor, are operable to cause the apparatus to report to the network node a beam prediction result regarding the AoA or AoD associated with the channel, wherein the instructions, when executed by the processor, are operable to cause the apparatus to send the SRS, the SRS being based on the virtual downlink beam resources and in accordance with the spatial relationship information specified in the configuration for the AoA or AoD associated with the channel.

6. An apparatus according to claim 2, wherein the instructions, when executed by the processor, are capable of causing the apparatus to receive a beam prediction result regarding the AoA or AoD associated with the channel from the network node, wherein the instructions, when executed by the processor, are capable of causing the apparatus to send the SRS, the SRS being based on the virtual downlink beam resources and according to the spatial relationship information specified in the configuration for the AoA or AoD associated with the channel. 7 . The apparatus according to claim 1 , wherein the configuration indicates the spatial relationship information of each SRS resource set of a plurality of SRS resources.

8. A device according to claim 7, wherein the instructions are capable of operating when executed by the processor to cause the device to send the SRS based on a usage indication non-codebook configured for the SRS resource set, and the SRS is based on the virtual downlink beam resource or at least one of the AoA or AoD associated with the channel.

9. An apparatus according to claim 7, wherein the instructions are operable when executed by the processor to cause the apparatus to send the SRS based on a usage indication for the configuration of the SRS resource set indicating a usage type for the virtual downlink beam resource or the AoA or AoD associated with the channel, the SRS being based on at least one of the virtual downlink beam resource or the AoA or AoD associated with the channel.

10. An apparatus according to claim 1, wherein the instructions, when executed by the processor, are operable to cause the apparatus to send an uplink beam recommendation based on a downlink beam prediction to the network node, wherein the uplink beam recommendation includes the virtual downlink beam resource or one of the AoA or AoD associated with the channel.

11. The apparatus of claim 10, wherein the instructions, when executed by the processor, are operable to cause the apparatus to send the uplink beam recommendation based on detecting a maximum permitted exposure (MPE) event at the apparatus.

12. An apparatus according to claim 11, wherein the instructions are operable when executed by the processor to cause the apparatus to detect the MPE event based on detecting the transmission of a power headroom report (PHR) medium access control-control element (MAC-CE) with a power management maximum power reduction (P-MPR) item at the apparatus and within a time period before the uplink beam recommendation is sent.

13. The apparatus of claim 11, wherein the instructions, when executed by the processor, are operable to cause the apparatus to send the uplink beam recommendation in a medium access control-control element (MAC-CE) or downlink control information (DCI).

14. An apparatus for wireless communication, comprising: processor; a memory coupled to the processor; and instructions stored in the memory and operable when executed by the processor to cause the apparatus to: A configuration is sent for a user equipment (UE) indicating spatial relationship information associated with at least one of: Virtual downlink beam resources; or an angle of arrival (AoA) or an angle of departure (AoD) associated with a channel between the UE and the device; as well as A sounding reference signal (SRS) is received for the UE, the sounding reference signal (SRS) being based on the virtual downlink beam resource or at least one of the AoA or AoD associated with the channel and in accordance with the spatial relationship information. The apparatus of claim 14 , wherein the configuration indicates the spatial relationship information of each SRS resource.

16. An apparatus according to claim 15, wherein the instructions, when executed by the processor, are capable of operating so that the apparatus receives a beam prediction result regarding the virtual downlink beam resource for the UE, wherein the instructions, when executed by the processor, are capable of operating so that the apparatus receives the SRS, the SRS being based on the virtual downlink beam resource and according to the spatial relationship information specified in the configuration for the virtual downlink beam resource.

17. An apparatus according to claim 15, wherein the instructions, when executed by the processor, are capable of operating so that the apparatus sends a beam prediction result regarding the virtual downlink beam resource to the UE, wherein the instructions, when executed by the processor, are capable of operating so that the apparatus receives the SRS, the SRS being based on the virtual downlink beam resource and according to the spatial relationship information specified in the configuration for the virtual downlink beam resource.

18. An apparatus according to claim 15, wherein the instructions, when executed by the processor, are capable of causing the apparatus to receive, for the UE, a beam prediction result regarding the AoA or AoD associated with the channel, wherein the instructions, when executed by the processor, are capable of causing the apparatus to receive the SRS, the SRS being based on the virtual downlink beam resources and according to the spatial relationship information specified in the configuration for the AoA or AoD associated with the channel.

19. An apparatus according to claim 15, wherein the instructions, when executed by the processor, are capable of causing the apparatus to send a beam prediction result regarding the AoA or AoD associated with the channel to the UE, wherein the instructions, when executed by the processor, are capable of causing the apparatus to receive the SRS, the SRS being based on the virtual downlink beam resources and according to the spatial relationship information specified in the configuration for the AoA or AoD associated with the channel.

20. The apparatus of claim 14, wherein the configuration indicates the spatial relationship information of each SRS resource set of a plurality of SRS resources.

21. A device according to claim 20, wherein the instructions are capable of operating when executed by the processor to cause the device to receive the SRS based on a usage indication non-codebook configured for the SRS resource set, and the SRS is based on the virtual downlink beam resource or at least one of the AoA or AoD associated with the channel.

22. A device according to claim 20, wherein the instructions are capable of operating when executed by the processor to cause the device to receive the SRS based on a usage indication of the configuration for the SRS resource set for the virtual downlink beam resource or the type of use of the AoA or AoD associated with the channel, and the SRS is based on at least one of the virtual downlink beam resource or the AoA or AoD associated with the channel.

23. A device according to claim 14, wherein the instructions are capable of operating when executed by the processor to cause the device to receive an uplink beam recommendation based on downlink beam prediction for the UE, wherein the uplink beam recommendation includes the virtual downlink beam resource or one of the AoA or AoD associated with the channel.

24. The apparatus of claim 23, wherein the instructions, when executed by the processor, are operable to cause the apparatus to receive the uplink beam recommendation based on a maximum permitted exposure (MPE) event at the UE.

25. The apparatus of claim 23, wherein the instructions, when executed by the processor, are operable to cause the apparatus to receive the uplink beam recommendation in a medium access control-control element (MAC-CE) or downlink control information (DCI).

26. A method for wireless communication at a user equipment (UE), comprising: Receiving, from a network node, a configuration indicating spatial relationship information associated with at least one of: Virtual downlink beam resources; or an angle of arrival (AoA) or an angle of departure (AoD) associated with a channel between the UE and the network node; and A sounding reference signal (SRS) is sent to the network node, the sounding reference signal (SRS) being based on the virtual downlink beam resource or at least one of the AoA or AoD associated with the channel and in accordance with the spatial relationship information. The method of claim 26 , wherein the configuration indicates the spatial relationship information of each SRS resource.

28. The method according to claim 27, further comprising: and reporting a beam prediction result about the virtual downlink beam resource to the network node, wherein sending the SRS comprises sending the SRS based on the virtual downlink beam resource and according to the spatial relationship information specified in the configuration for the virtual downlink beam resource.

29. A method for wireless communication at a network node, comprising: A configuration is sent for a user equipment (UE) indicating spatial relationship information associated with at least one of: Virtual downlink beam resources; or an angle of arrival (AoA) or an angle of departure (AoD) associated with a channel between the UE and the network node; as well as A sounding reference signal (SRS) is received for the UE, the sounding reference signal (SRS) being based on the virtual downlink beam resource or at least one of the AoA or AoD associated with the channel and in accordance with the spatial relationship information.

30. The method of claim 29, wherein the configuration indicates the spatial relationship information of each SRS resource.

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