Mode determination for orbital angular momentum communication systems

Abstract

Various aspects of the present disclosure generally relate to wireless communications. In some aspects, a transmitter may receive feedback from a receiver associated with a communication based on orbital angular momentum (OAM) multiplexing; determine a selected OAM mode for communicating with the receiver based at least in part on the feedback; and transmit the OAM multiplexing-based communication to the receiver based at least in part on the selected OAM mode. Numerous other aspects are provided.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This patent application claims priority to PCT Patent Application No. PCT / CN2020 / 099859, entitled “MODE DETERMINATION FOR ORBITALANGULAR MOMENTUM COMMUNICATION SYSTEM”, filed on July 2, 2020, and is assigned to the assignee of this application. The disclosure of the prior application is considered part of this patent application and is incorporated into this patent application by reference.

[0003] Public domain

[0004] Aspects of the present disclosure relate generally to wireless communications and, more particularly, to techniques and apparatus for mode determination for orbital angular momentum (OAM) communication systems.

[0005] background

[0006] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasting. Typical wireless communication systems may employ multiple access technologies that can support communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and long term evolution (LTE). LTE / LTE-Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3GPP).

[0007] A wireless network may include several base stations (BSs) capable of supporting communications for several user equipments (UEs). User equipments (UEs) may communicate with base stations (BSs) via downlinks and uplinks. A "downlink" (or "forward link") refers to a communication link from a BS to a UE, and an "uplink" (or "reverse link") refers to a communication link from a UE to a BS. As will be described in more detail herein, a BS may be referred to as a Node B, gNB, Access Point (AP), Radio Head, Transmit Receiving Point (TRP), New Radio (NR) BS, 5G Node B, and the like.

[0008] The above multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different user equipment to communicate at the city, country, region, and even global level. NR (which may also be referred to as 5G) is an enhancement set to the LTE mobile standard promulgated by 3GPP. NR is designed to better support mobile broadband Internet access by using orthogonal frequency division multiplexing (OFDM) (CP-OFDM) with cyclic prefix (CP) on the downlink (DL), using CP-OFDM and / or SC-FDM (e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink (UL), and supporting beamforming, multiple input multiple output (MIMO) antenna technology and carrier aggregation to improve spectrum efficiency, reduce costs, improve services, utilize new spectrum, and better integrate with other open standards. As the demand for mobile broadband access continues to grow, further improvements to LTE, NR and other radio access technologies are still useful.

[0009] Overview

[0010] In some aspects, a wireless communication method performed by a transmitter includes: receiving feedback from a receiver associated with orbital angular momentum (OAM) multiplexing-based communications; determining a selected OAM mode for communicating with the receiver based at least in part on the feedback; and transmitting the OAM multiplexing-based communications to the receiver based at least in part on the selected OAM mode.

[0011] In some aspects, a wireless communication method performed by a receiver includes determining feedback associated with an OAM multiplexing-based communication; and transmitting the feedback to a transmitter of the OAM multiplexing-based communication.

[0012] In some aspects, a transmitter for wireless communication includes: a memory; and one or more processors coupled to the memory, the memory and the one or more processors configured to: receive feedback from a receiver associated with an OAM multiplexing-based communication; determine a selected OAM mode for communicating with the receiver based at least in part on the feedback; and transmit the OAM multiplexing-based communication to the receiver based at least in part on the selected OAM mode.

[0013] In some aspects, a receiver for wireless communication includes: a memory; and one or more processors coupled to the memory, the memory and the one or more processors configured to: determine feedback associated with OAM multiplexing-based communication; and transmit the feedback to a transmitter of the OAM multiplexing-based communication.

[0014] In some aspects, a non-transitory computer-readable medium storing one or more instructions for wireless communication includes: one or more instructions that, when executed by one or more processors of a transmitter, cause the one or more processors to: receive feedback from a receiver associated with an OAM multiplexing-based communication; determine a selected OAM mode for communicating with the receiver based at least in part on the feedback; and transmit the OAM multiplexing-based communication to the receiver based at least in part on the selected OAM mode.

[0015] In some aspects, a non-transitory computer-readable medium storing one or more instructions for wireless communication includes: one or more instructions that, when executed by one or more processors of a recipient, cause the one or more processors to: determine feedback associated with an OAM multiplexing-based communication; and transmit the feedback to a transmitter of the OAM multiplexing-based communication.

[0016] In some aspects, an apparatus for wireless communications includes: means for receiving feedback from a receiver associated with an OAM multiplexing-based communication; means for determining a selected OAM mode for communicating with the receiver based at least in part on the feedback; and means for transmitting the OAM multiplexing-based communication to the receiver based at least in part on the selected OAM mode.

[0017]

[0011] In some aspects, an apparatus for wireless communications includes means for determining feedback associated with OAM multiplexing-based communications; and means for transmitting the feedback to a transmitter of the OAM multiplexing-based communications.

[0018] Aspects generally include methods, apparatus, systems, computer program products, non-transitory computer-readable media, user equipment, base stations, wireless communication devices, and / or processing systems as substantially described herein with reference to and as illustrated in the accompanying figures and specification.

[0019] The foregoing has broadly outlined the features and technical advantages of examples according to the present disclosure in an effort to make the following detailed description better understood. Additional features and advantages will be described hereinafter. The disclosed concepts and specific examples can be easily used as a basis for modifying or designing other structures for implementing the same purpose as the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The characteristics of the concepts disclosed herein, both in terms of their organization and method of operation, and the associated advantages will be better understood by considering the following description in conjunction with the accompanying drawings. Each of the accompanying drawings is provided for the purpose of illustration and description and is not intended to define limitations on the claims.

[0020] Although various aspects are described in the present disclosure by explaining some examples, it will be understood by those skilled in the art that such aspects can be implemented in many different arrangements and scenarios. The technology described herein can be implemented using different platform types, devices, systems, shapes, sizes and / or packaging arrangements. For example, some aspects can be implemented via integrated chip embodiments or other devices based on non-module components (e.g., end-user devices, vehicles, communication equipment, computing equipment, industrial equipment, retail / shopping equipment, medical equipment, or devices that enable artificial intelligence). Various aspects can be implemented in chip-level components, module components, non-module components, non-chip-level components, device-level components, or system-level components. The equipment incorporating the various aspects and features described may include additional components and features for implementing and practicing the various aspects claimed and described. For example, the transmission and reception of wireless signals may include several components (e.g., hardware components, including antennas, radio frequency (RF) chains, power amplifiers, modulators, buffers, processors, interleavers, adders, or summers) for analog and digital purposes. The various aspects described herein are intended to be practiced in various devices, components, systems, distributed arrangements, or end-user devices of various sizes, shapes, and configurations. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to understand the above-stated features of the present disclosure in detail, the above briefly summarized content may be described in more detail with reference to various aspects, some of which are illustrated in the accompanying drawings. However, it should be noted that the accompanying drawings only illustrate certain typical aspects of the present disclosure and should not be considered to limit its scope, as the description may allow for other equally effective aspects. The same reference numerals in different drawings may identify the same or similar elements.

[0023] Figure 1 is a diagram illustrating an example of a wireless network according to the present disclosure.

[0024] Figure 2 is a diagram illustrating an example in which a base station and a UE are in communication in a wireless network according to the present disclosure.

[0025] Figure 3 is a diagram illustrating an example of OAM communication components of a transmitter and a receiver according to the present disclosure.

[0026] Figure 4 is a diagram illustrating an example of a transmitter and a receiver having a uniform circular array (UCA) antenna according to the present disclosure.

[0027] Figure 5 is a diagram illustrating an example of signaling associated with OAM mode determination for OAM multiplexed communications according to the present disclosure.

[0028] Figure 6is a diagram illustrating an example of a Bessel function output that may be used in conjunction with a transmitter's selection of an OAM mode in accordance with the present disclosure.

[0029] Figure 7-Figure 8 is a diagram illustrating an example process associated with OAM mode determination for OAM multiplexed communications according to the present disclosure.

[0030] Detailed Description

[0031] The various aspects of the present disclosure are described more fully below with reference to the accompanying drawings. However, the present disclosure can be implemented in many different forms and should not be interpreted as being limited to any specific structure or function given throughout the present disclosure. On the contrary, these aspects are provided to make the present disclosure thorough and complete, and it will fully convey the scope of the present disclosure to those skilled in the art. Based on the teachings of this article, those skilled in the art will appreciate that the scope of the present disclosure is intended to cover any aspect of the present disclosure disclosed herein, whether it is independently implemented or implemented in combination with any other aspect of the present disclosure. For example, any number of aspects set forth herein can be used to implement a device or practice method. In addition, the scope of the present disclosure is intended to cover such devices or methods practiced using supplements or other other structures, functionality, or structures and functionality as the various aspects of the present disclosure set forth herein. It should be understood that any aspect of the present disclosure disclosed herein can be implemented by one or more elements of the claims.

[0032] Several aspects of telecommunication systems will now be presented with reference to various devices and techniques. These devices and techniques will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as "elements"). These elements can be implemented using hardware, software, or a combination thereof. Whether such elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0033] It should be noted that while various aspects may be described herein using terminology generally associated with 5G or NR radio access technologies (RATs), various aspects of the present disclosure may be applied to other RATs, such as 3G RATs, 4G RATs, and / or RATs after 5G (e.g., 6G).

[0034] Figure 11 is a diagram illustrating an example of a wireless network 100 according to the present disclosure. The wireless network 100 may be a 5G (NR) network and / or an LTE network, etc. or may include elements thereof. The wireless network 100 may include several base stations 110 (shown as BS110a, BS 110b, BS 110c, and BS 110d) and other network entities. A base station (BS) is an entity that communicates with a user equipment (UE) and may also be referred to as an NR BS, a B node, a gNB, a 5G B node (NB), an access point, a transmit receive point (TRP), etc. Each BS may provide communication coverage for a specific geographic area. In 3GPP, the term "cell" may refer to a coverage area of ​​a BS and / or a BS subsystem serving the coverage area, depending on the context in which the term is used.

[0035] A BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and / or another type of cell. A macro cell may cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscriptions. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscriptions. A femto cell may cover a relatively small geographic area (e.g., a residence) and may allow restricted access by UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG)). A BS for a macro cell may be referred to as a macro BS. A BS for a pico cell may be referred to as a pico BS. A BS for a femto cell may be referred to as a femto BS or a home BS. In Figure 1 In the example shown in , BS 110a may be a macro BS for macro cell 102a, BS 110b may be a pico BS for pico cell 102b, and BS 110c may be a femto BS for femto cell 102c. The BS may support one or more (e.g., three) cells. The terms "eNB", "base station", "NR BS", "gNB", "TRP", "AP", "B node", "5G NB", and "cell" may be used interchangeably herein.

[0036] In some aspects, the cell may not necessarily be stationary, and the geographic area of ​​the cell may move depending on the location of the mobile BS. In some aspects, the BSs may be interconnected to each other and / or to one or more other BSs or network nodes (not shown) in the wireless network 100 via various types of backhaul interfaces, such as direct physical connections or virtual networks, using any suitable transport network.

[0037] The wireless network 100 may also include a relay station. A relay station is an entity that can receive transmissions of data from an upstream station (e.g., a BS or a UE) and send transmissions of the data to a downstream station (e.g., a UE or a BS). A relay station may also be a UE that can relay transmissions for other UEs. Figure 1 In the example shown in , relay BS 110d may communicate with macro BS 110a and UE 120d to facilitate communication between BS 110a and UE 120d. A relay BS may also be referred to as a relay station, relay base station, relay, or the like.

[0038] The wireless network 100 may be a heterogeneous network including different types of BSs, such as a macro BS, a pico BS, a femto BS, a relay BS, etc. These different types of BSs may have different transmit power levels, different coverage areas, and different effects on interference in the wireless network 100. For example, a macro BS may have a high transmit power level (e.g., 5 to 40 watts), while a pico BS, a femto BS, and a relay BS may have a lower transmit power level (e.g., 0.1 to 2 watts).

[0039] A network controller 130 may be coupled to a set of BSs and may provide coordination and control of these BSs. The network controller 130 may communicate with each BS via a backhaul. The BSs may also communicate with each other directly or indirectly via a wireless or wired backhaul.

[0040] UEs 120 (e.g., 120a, 120b, 120c) may be dispersed throughout the wireless network 100, and each UE may be stationary or mobile. UEs may also be referred to as access terminals, terminals, mobile stations, subscriber units, stations, etc. A UE may be a cellular phone (e.g., a smart phone), a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or equipment, a biometric sensor / device, a wearable device (smart watch, smart clothing, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet)), an entertainment device (e.g., a music or video device, or a satellite radio), a vehicle component or sensor, a smart meter / sensor, an industrial manufacturing equipment, a global positioning system device, or any other suitable device configured to communicate via a wireless or wired medium.

[0041] Some UEs may be considered as machine type communication (MTC) UEs, or evolved or enhanced machine type communication (eMTC) UEs. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, and / or location tags, which may communicate with a base station, another device (e.g., a remote device), or some other entity. A wireless node may provide connectivity to or to a network (e.g., a wide area network (such as the Internet) or a cellular network) via, for example, a wired or wireless communication link. Some UEs may be considered as Internet of Things (IoT) devices, and / or may be implemented as NB-IoT (narrowband Internet of Things) devices. Some UEs may be considered as client equipment (CPE). UE 120 may be included inside a housing that houses components of UE 120, such as a processor component and / or a memory component. In some aspects, a processor component and a memory component may be coupled together. For example, a processor component (e.g., one or more processors) and a memory component (e.g., a memory) may be operatively coupled, communicatively coupled, electronically coupled, and / or electrically coupled.

[0042] In general, any number of wireless networks may be deployed in a given geographic area. Each wireless network may support a specific RAT and may operate on one or more frequencies. RAT may also be referred to as radio technology, air interface, etc. Frequency may also be referred to as carrier, frequency channel, etc. Each frequency may support a single RAT in a given geographic area to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks may be deployed.

[0043] In some aspects, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly (e.g., without using base station 110 as an intermediary to communicate with each other) using one or more sidelink channels. For example, UE 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocols (e.g., which may include vehicle-to-vehicle (V2V) protocols or vehicle-to-infrastructure (V2I) protocols), and / or mesh networks. In this case, UE 120 may perform scheduling operations, resource selection operations, and / or other operations described elsewhere herein as being performed by base station 110.

[0044] The devices of the wireless network 100 may communicate using an electromagnetic spectrum that may be subdivided into various categories, bands, channels, etc. based on frequency or wavelength. For example, the devices of the wireless network 100 may communicate using an operating band having a first frequency range (FR1) and / or may communicate using an operating band having a second frequency range (FR2), the first frequency range (FR1) may span 410 MHz to 7.125 GHz, and the second frequency range (FR2) may span 24.25 GHz to 52.6 GHz. Frequencies between FR1 and FR2 are sometimes referred to as mid-band frequencies. Although a portion of FR1 is greater than 6 GHz, FR1 is often referred to as a "sub-6 GHz" band. Similarly, FR2 is often referred to as a "millimeter wave" band, although it is different from the extremely high frequency (EHF) band (30 GHz–300 GHz) identified as a "millimeter wave" band by the International Telecommunication Union (ITU). Therefore, unless otherwise specifically stated, it should be understood that the terms "sub-6 GHz" and the like, if used herein, may broadly refer to frequencies less than 6 GHz, frequencies within FR1, and / or mid-band frequencies (e.g., greater than 7.125 GHz). Similarly, unless otherwise specifically stated, it should be understood that the terms "millimeter wave" and the like, if used herein, may broadly refer to frequencies within the EHF band, frequencies within FR2, and / or mid-band frequencies (e.g., less than 24.25 GHz). It is contemplated that the frequencies included in FR1 and FR2 may be modified, and the techniques described herein are applicable to those modified frequency ranges.

[0045] As indicated above, Figure 1 are provided as examples. Other examples may differ from those described herein. Figure 1 Examples described.

[0046] Figure 2 is a diagram illustrating an example 200 of a base station 110 and a UE 120 in communication in a wireless network 100 according to the present disclosure. The base station 110 may be equipped with T antennas 234a through 234t, and the UE 120 may be equipped with R antennas 252a through 252r, where in general T≥1 and R≥1.

[0047] At the base station 110, the transmit processor 220 may receive data for one or more UEs from the data source 212, select one or more modulation and coding schemes (MCS) for each UE based at least in part on a channel quality indicator (CQI) received from the UE, process (e.g., encode and modulate) the data for the UE based at least in part on the MCS selected for each UE, and provide data symbols for all UEs. The transmit processor 220 may also process system information (e.g., for semi-static resource partitioning information (SRPI)) and control information (e.g., CQI requests, grants, and / or upper layer signaling), and provide overhead symbols and control symbols. The transmit processor 220 may also generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS) or demodulation reference signals (DMRS)) and synchronization signals (e.g., primary synchronization signals (PSS) or secondary synchronization signals (SSS)). A transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on ​​data symbols, control symbols, overhead symbols, and / or reference symbols, where applicable, and may provide T output symbol streams to T modulators (MODs) 232a through 232t. Each modulator 232 may process a respective output symbol stream (e.g., for OFDM) to obtain an output sample stream. Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. The T downlink signals from modulators 232a through 232t may be transmitted via T antennas 234a through 234t, respectively.

[0048] At UE 120, antennas 252a to 252r may receive downlink signals from base station 110 and / or other base stations and may provide received signals to demodulators (DEMODs) 254a to 254r, respectively. Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) the received signal to obtain input samples. Each demodulator 254 may further process the input samples (e.g., for OFDM) to obtain received symbols. A MIMO detector 256 may obtain received symbols from all R demodulators 254a to 254r, perform MIMO detection on the received symbols where applicable, and provide detected symbols. A receive processor 258 may process (e.g., demodulate and decode) the detected symbols, provide decoded data for UE 120 to a data sink 260, and provide decoded control information and system information to a controller / processor 280. The term "controller / processor" may refer to one or more controllers, one or more processors, or a combination thereof. The channel processor may determine a reference signal received power (RSRP) parameter, a received signal strength indicator (RSSI) parameter, a reference signal received quality (RSRQ) parameter, and / or a channel quality indicator (CQI) parameter, etc. In some aspects, one or more components of the UE 120 may be included in the housing 284.

[0049] The network controller 130 may include a communication unit 294, a controller / processor 290, and a memory 292. The network controller 130 may include, for example, one or more devices in a core network. The network controller 130 may communicate with the base station 110 via the communication unit 294.

[0050] Antennas (e.g., antennas 234a to 234t and / or antennas 252a to 252r) may include, or may be included within, one or more antenna panels, antenna groups, antenna element sets, and / or antenna arrays, etc. Antenna panels, antenna groups, antenna element sets, and / or antenna arrays may include one or more antenna elements. Antenna panels, antenna groups, antenna element sets, and / or antenna arrays may include coplanar antenna element sets and / or non-coplanar antenna element sets. Antenna panels, antenna groups, antenna element sets, and / or antenna arrays may include antenna elements within a single housing and / or antenna elements within multiple housings. Antenna panels, antenna groups, antenna element sets, and / or antenna arrays may include antenna elements coupled to one or more transmission and / or reception components (such as Figure 2 One or more antenna elements of one or more components).

[0051] On the uplink, at the UE 120, a transmit processor 264 may receive and process data from a data source 262 and control information (e.g., for reports including RSRP, RSSI, RSRQ, and / or CQI) from a controller / processor 280. The transmit processor 264 may also generate reference symbols for one or more reference signals. The symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266, where applicable, further processed by modulators 254a through 254r (e.g., for DFT-s-OFDM or CP-OFDM), and transmitted to the base station 110. In some aspects, the modulator and demodulator (e.g., MOD / DEMOD 254) of the UE 120 may be included in a modem of the UE 120. In some aspects, the UE 120 includes a transceiver. The transceiver may include any combination of antenna(s) 252, modulator and / or demodulator 254, MIMO detector 256, receive processor 258, transmit processor 264, and / or TX MIMO processor 266. The transceiver may be used by a processor (e.g., controller / processor 280) and memory 282 to perform aspects of any of the methods described herein (e.g., as described with reference to Figure 3-Figure 8 described).

[0052] At the base station 110, uplink signals from the UE 120 and other UEs may be received by the antenna 234, processed by the demodulator 232, detected by the MIMO detector 236 where applicable, and further processed by the receive processor 238 to obtain decoded data and control information transmitted by the UE 120. The receive processor 238 may provide the decoded data to the data sink 239 and the decoded control information to the controller / processor 240. The base station 110 may include a communication unit 244 and communicate with the network controller 130 via the communication unit 244. The base station 110 may include a scheduler 246 to schedule the UE 120 for downlink and / or uplink communications. In some aspects, the modulator and demodulator (e.g., MOD / DEMOD 232) of the base station 110 may be included in a modem of the base station 110. In some aspects, the base station 110 includes a transceiver. The transceiver may include any combination of antenna(s) 234, modulator and / or demodulator 232, MIMO detector 236, receive processor 238, transmit processor 220, and / or TX MIMO processor 230. The transceiver may be used by a processor (e.g., controller / processor 240) and memory 242 to perform aspects of any of the methods described herein (e.g., as described with reference to Figure 3-Figure 8 described).

[0053] The controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2 Any other components of the controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2 Any other component of the Figure 7 The process 700 Figure 8 800, and / or operations of other processes as described herein. Memories 242 and 282 may store data and program codes for base station 110 and UE 120, respectively. In some aspects, memory 242 and / or memory 282 may include: a non-transitory computer-readable medium storing one or more instructions (e.g., code and / or program code) for wireless communication. For example, the one or more instructions, when executed (e.g., directly, or after compilation, conversion, and / or interpretation) by one or more processors of base station 110 and / or UE 120, may cause the one or more processors, UE 120, and / or base station 110 to perform or direct, for example Figure 7 The process 700 Figure 8 In some aspects, executing instructions may include running instructions, converting instructions, compiling instructions, and / or interpreting instructions, etc.

[0054] In some aspects, a transmitter (e.g., UE 120 or BS 110) may include means for receiving feedback from a receiver associated with an orbital angular momentum (OAM) multiplexing-based communication; means for determining, based at least in part on the feedback, a selected OAM mode for communicating with the receiver; means for transmitting the OAM multiplexing-based communication to the receiver based at least in part on the selected OAM mode; and the like. In some aspects, such means may include in conjunction with Figure 2 One or more components of UE 120 are depicted, such as controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, and the like.

[0055] In some aspects, a receiving party (e.g., UE 120 or BS 110) may include means for determining feedback associated with an OAM multiplexing-based communication; means for transmitting the feedback to a transmitting party of the OAM multiplexing-based communication; and the like. In some aspects, such means may include a method for combining Figure 2One or more components of base station 110 are depicted, such as antenna 234, DEMOD 232, MIMO detector 236, receive processor 238, controller / processor 240, transmit processor 220, TX MIMO processor 230, MOD 232, antenna 234, and the like.

[0056] although Figure 2 The blocks in the 200 and 210 are illustrated as distinct components, but the functions described above with respect to these blocks may be implemented using a single hardware, software, or combined component or a combination of various components. For example, the functions described with respect to the transmit processor 264, the receive processor 258, and / or the TX MIMO processor 266 may be performed by or under the control of the controller / processor 280.

[0057] As indicated above, Figure 2 are provided as examples. Other examples may differ from those described herein. Figure 2 Examples described.

[0058] Figure 3 3 is a diagram illustrating an example 300 of OAM communication components of a transmitter and a receiver according to aspects of the present disclosure. The transmitter may include a wireless communication device, such as a UE 120 or a BS 110. The receiver may include a wireless communication device, such as a UE 120 or a BS 110. The transmitter may transmit communications using OAM multiplexing, such as communications in which multiple layers are multiplexed using OAM multiplexing, with one or more layers per OAM mode.

[0059] The communication components of the transmitter are surrounded by box 305, and the components of the receiver are surrounded by box 310. As shown, the transmitter may include transmitter apertures 315-a and 315-2. OAM modes can be used to multiplex multiple layers of communication into a single transmission. For example, different layers of communication can be mapped to different OAM modes. The transmitter of the OAM multiplexed communication radiates multiple coaxially propagated, spatially overlapping waves (where OAM mode l = ..., -2, -1, 0, 1, 2, ...), each wave carrying a data stream through a set of transmitter apertures 315. Having The electromagnetic (EM) wave with a spiral transverse phase in the form of a wave carries the OAM mode waveform, where is the azimuth angle, and l is an unbounded integer (called the OAM order). A conventional EM beam, such as a Gaussian beam, is an OAM beam with l = 0. The EM wave may be an optical beam or another form of EM wave.

[0060] Here, the transmitter includes two transmitter apertures 315, and the receiver includes two receiver apertures 320. Therefore, the transmitter may be able to use two OAM modes to transmit OAM multiplexed communications, and the receiver may be able to use two OAM modes to receive OAM multiplexed communications. The transmitter aperture 315 and the receiver aperture 320 are combined Figure 4 Describe in more detail.

[0061] As shown, the transmitter includes a set of spiral phase plates (SPPs) 325, and the receiver includes a set of SPPs 330. The SPPs in the optical component include a spiral or spiral phase step. The SPPs can modify the angular momentum of the wave transmitted via the SPPs, which enables OAM multiplexing of multiple layers (transmitted by the corresponding transmitter aperture 315) and demultiplexing of the multiple layers before being received by the corresponding receiver aperture 320. For example, the SPP 325 can modulate the waveform for OAM multiplexing, and the SPP 330 can demodulate the waveform for OAM multiplexing. In some aspects, the transmit beam splitter 335 can combine the corresponding waves associated with the corresponding OAM modes from the transmitter aperture 315 into a combined beam 340 transmitted via the channel, and the receive beam splitter 345 can split the corresponding waves (to the extent possible at the receive beam splitter 345) for reception at the receiver aperture 320. In theory, the waves of each OAM mode can be orthogonally received under the same radio resources (e.g., the same time-frequency domain resources), and thus the use of OAM multiplexing can greatly improve the communication spectrum efficiency. In practice, due to non-ideal factors (such as transmitter / receiver axial or position placement errors), these waves will cause a certain degree of crosstalk between OAM modes at the receiver. Some of the techniques and devices described herein provide communication between a transmitter and a receiver so that an OAM mode can be selected to improve the performance of communication based on OAM multiplexing.

[0062] As indicated above, Figure 3 are provided as examples. Other examples may differ from those described herein. Figure 3 Examples described.

[0063] Figure 4is a diagram illustrating an example 400 of a transmitter 405 and a receiver 410 having a uniform circular array (UCA) antenna according to the present disclosure. The UCA antenna 415 of the transmitter 405 may include an aperture, such as one of the transmitter apertures 315. The UCA antenna 420 of the receiver 410 may include an aperture, such as one of the receiver apertures 320. The UCA antenna 415 may include a plurality of transmit antennas 425, where two transmit antennas are indicated by reference numeral 425. The UCA antenna 420 may include a plurality of receive (Rx) antennas 430, where two receive antennas are indicated by reference numeral 430. The transmit antennas 425 may be uniformly spaced apart (e.g., substantially equidistant from a center of the UCA antenna 415 and / or spaced apart at substantially equal radial intervals relative to each other). The angular displacement of the transmit antennas 425 relative to the axis is indicated by instruct.

[0064] The beamforming weights are generally indicated by reference numeral 435 and are given by w1=[w 1,1 ,w 1,2 ,…,w 1,8 ] T By multiplying the corresponding beamforming weight by the signal of each transmit antenna 425, signal ports 440 / 445 / 450 may be generated. Signal port 440 may be used for the first layer of communication, signal port 445 may be used for the second layer of communication, and so on, up to the Nth layer of communication. If the weight of each transmit antenna 425 is equal to in is the angle of the transmit antenna 425 in a circle and l is the OAM mode index, then the beamformed port is equivalent to OAM mode l. By using different beamforming weights Where l′≠l, multiple OAM modes are generated. For example, using N values ​​of l, N different OAM modes can be multiplexed.

[0065] UCA antenna 420 has a structure similar to that of UCA antenna 425. For example, receive antennas 430 may be evenly spaced (e.g., substantially equidistant from the center of UCA antenna 420 and / or at substantially equal radial spacing relative to each other). UCA antenna 420 may be based at least in part on a channel matrix. To receive OAM multiplexing-based communications from the UCA antenna 415. For example, the channel matrix from each transmit antenna 425 to each receive antenna 430 can be denoted as H. For the beamformed channel matrix Any two columns of are orthogonal. Thus, all beamformed ports are ideally free of crosstalk, thereby enabling OAM-based communications to efficiently achieve advanced spatial multiplexing.

[0066] Although received waveforms with different OAM modes are orthogonal, the waveforms may have different channel gains and / or signal-to-interference-plus-noise ratios (SINRs). For example, channel gains and / or SINRs that would otherwise be equal may fluctuate based at least in part on the OAM mode index l. In some aspects, higher frequencies (f ) may have higher frequencies (f ) than lower frequencies. c ) can maintain inter-mode orthogonal multiplexing across a longer distance (Z0). However, these channel gains are jointly determined by the transmitter parameters, the receiver parameters, and the channel parameters. Without access to the receiver parameters and the channel parameters, an OAM communication transmitter (such as the transmitter 405) may not be able to determine a suitable OAM mode associated with a high channel gain. As a result, the transmission performance of OAM multiplexing-based communications may be affected, thereby reducing throughput and using computing and communication resources.

[0067] Some techniques and devices described herein provide that an OAM communication receiver (such as receiver 410) provides feedback associated with OAM multiplexing-based communication to an OAM communication transmitter (such as transmitter 405). For example, the feedback may indicate a preferred OAM mode set of the receiver, a corresponding channel gain associated with the preferred OAM mode set, a channel parameter (e.g., path loss, etc.), a receiver parameter (e.g., an aperture radius of the UCA antenna 425), etc. The OAM communication transmitter may determine one or more selected OAM modes based at least in part on the feedback, and may use the one or more selected OAM modes to communicate with the OAM communication receiver. In some aspects, the OAM communication transmitter may transmit a reference signal such as on one or more OAM modes for determining feedback, or transmit a reference signal on one or more preferred OAM modes for selecting a selected OAM mode from the one or more preferred OAM modes. In this way, the OAM communication transmitter may determine one or more selected OAM modes for communicating with the OAM communication receiver based at least in part on feedback from the OAM communication receiver, which improves the channel gain of such communication and thereby improves throughput and reliability.

[0068] Although Figure 3 and 4 An OAM communication system utilizing UCA antennas is described, but some OAM communication systems utilize antennas in forms other than, such as in conjunction with, or in place of, UCA antennas. The techniques and apparatus described herein may be applied to OAM communication systems that do not use UCA antennas.

[0069] As indicated above, Figure 4 are provided as examples. Other examples may differ from those described herein. Figure 4 Examples described.

[0070] Figure 5 1 is a diagram illustrating an example 500 of signaling associated with OAM mode determination for OAM multiplexing communications according to the present disclosure. The operations described with respect to example 500 may be performed by a transmitting party (eg, UE 120, BS 220, Figure 3 The transmitter, Figure 4 405, etc.) and receiving parties (e.g., UE 120, BS 110, Figure 3 The recipient of Figure 4 's receiver 410, etc.) to execute.

[0071] like Figure 5 In some aspects, and as indicated by reference numeral 510, a transmitter may transmit one or more signals associated with a set of OAM modes to a receiver. In some aspects, the one or more signals may include a set of reference signals. For example, the transmitter may transmit the set of reference signals via corresponding waveforms of the set of OAM modes (e.g., one reference signal per OAM mode, multiple reference signals per OAM mode, etc.). In some aspects, the one or more signals may include signals other than reference signals, such as data communications or control communications.

[0072] In some aspects, the reference signal sets may be transmitted on the same radio resources (such as the same time-frequency resources). For example, because the reference signal sets are associated with different OAM modes, the reference signal sets may be transmitted on the same radio resources while retaining a certain degree of orthogonality with each other. Using the same time-frequency resources may reduce overhead and resource usage. In some aspects, the reference signal sets may be transmitted on different radio resources. If the transmitter and / or the receiver introduces some interference, for example due to imperfect calibration, transmitting the reference signal sets on different radio resources may reduce mutual interference of the reference signal sets.

[0073] In some aspects, the reference signal set may be based at least in part on an orthogonal cover code (OCC). For example, the transmitter may apply an OCC of [1 1, 1 -1] to a first pair of reference signals associated with a first OAM mode and a second pair of reference signals associated with a second OAM mode. For example, the OCC portion of [1 1] may be applied to the first and second reference signals in the first pair of reference signals, and the OCC portion of [1 -1] may be applied to the first and second reference signals in the second pair of reference signals. In this case, the first reference signal in the first pair and the first reference signal in the second pair may be summed and transmitted in the first radio resource with corresponding combined weights of 1 and 1, and the second reference signal in the first pair and the second reference signal in the second pair may be summed and transmitted in the second radio resource with corresponding combined weights of 1 and -1. As a result, the diversity of the reference signal set and the robustness against interference are improved.

[0074] As indicated by reference numeral 520, in some aspects, a receiver may determine feedback based at least in part on a signal received from a transmitter. For example, the receiver may perform a measurement on a signal (e.g., the reference signal set or another signal). The receiver may determine a set of channel gain and / or SINR values ​​corresponding to the OAM mode set. In some aspects, the receiver may determine a preferred OAM mode set, such as a set having one or more OAM modes associated with: the best channel gain and / or SINR value, a higher channel gain and / or SINR than other OAM modes, a channel gain and / or SINR that satisfies a threshold, and the like. If two OAM modes have equal channel gain and / or SINR, the receiver may, for example, select one of the two OAM modes based at least in part on which of the two OAM modes has a mode index with a lower absolute value. In some aspects, the receiver may determine an inter-mode interference matrix based at least in part on these signals. For example, the inter-mode interference matrix may indicate the mutual interference between groups of modes in the set of modes on which these signals are transmitted. In some aspects, the inter-mode interference matrix may be used in conjunction with Figure 3 and 4 The defined tags are represented as (For example, The Hermitian conjugate of ). If the receiver determines the inter-mode mutual interference matrix, the receiver may determine the one or more preferred OAM modes based at least in part on the inter-mode mutual interference matrix and the channel gain and / or SINR. For example, the receiver may calculate the SINR of each OAM mode based on the inter-mode mutual interference matrix, and then determine the one or more preferred OAM modes with the maximum SINR value.

[0075] In some aspects, the transmitter may transmit reference signals at different polarizations. For example, each OAM mode may have multiple (e.g., two) polarizations. Two data streams may be transmitted at each polarization. If the polarization direction is equal between the Tx aperture and the Rx aperture, there may be no mutual interference between the two data streams. Otherwise, the two data streams may suffer a certain amount of inter-polarization interference. The transmitter may transmit a reference signal at each polarization of each OAM mode. The receiver may select one or more OAM modes and may report the SINR or channel gain for each polarization of the selected one or more OAM modes.

[0076] In some aspects, the receiver may determine channel parameters based at least in part on these signals. Channel parameters refer to measurements or other information determined about the channel through which the signal 510 propagates. For example, the channel parameters may include path loss or another parameter. In some aspects, the receiver may determine the distance d from the transmitter based at least in part on the path loss. For example, the receiver may determine the distance based at least in part on the path loss, signal propagation delay, the expected received power of the reference signal, etc. The distance d can be considered as a channel parameter. The receiver may provide an indication of the channel parameters to the transmitter in feedback, as described in more detail below.

[0077] In some aspects, the receiver may determine receiver parameters. "Receiver parameters" refers to measurements or other information about the receiver. An example of a receiver parameter includes the aperture radius R of the receiver. rx (e.g., the distance from the midpoint of a UCA antenna or aperture to the receiver antenna of that UCA antenna or aperture). The receiver may provide an indication of the receiver parameters to the transmitter in feedback, as described in more detail below. In some aspects, the receiver may report the ability to support one polarization or both polarizations. In some cases, such as for complexity reduction, the capabilities may be different among different OAM modes. In this case, the reported capabilities may be per OAM mode.

[0078] As shown, the receiver may transmit feedback 530 to the transmitter. The feedback may include information indicating a preferred set of OAM modes, one or more channel parameters (e.g., distance d, path loss, one or more channel gains, one or more SINRs, etc.), one or more receiver parameters (e.g., aperture radius of the receiver, etc.), combinations thereof, etc. In some aspects, the receiver may transmit the feedback 530 based at least in part on receiving the signal 510. In some aspects, the receiver may transmit the feedback 530 based at least in part on a request from the transmitter. In some aspects, the receiver may transmit the feedback 530 periodically.

[0079] As indicated by reference numeral 540, in some aspects, the transmitter may determine the preferred OAM mode set based at least in part on the feedback 530. For example, the feedback 530 may indicate the preferred OAM mode set as selected by the receiver. As another example, the transmitter may determine the preferred OAM mode set based at least in part on one or more channel parameters and / or one or more receiver parameters indicated by the feedback 530. For a more detailed description of selecting the preferred OAM mode set, refer to Figure 6 Description.

[0080] As shown, in some aspects, a transmitter may transmit a set of reference signals 550 associated with a preferred OAM mode set, such as a preferred OAM mode set selected by a receiver and indicated in feedback 530, or a preferred OAM mode set determined by the transmitter based at least in part on the feedback. The reference signal set may include one or more reference signals as defined in conjunction with reference numeral 510. By transmitting the reference signal set over the preferred OAM mode set, the transmitter may save signaling and processing resources that may otherwise be used to arbitrarily and / or repeatedly transmit the reference signal set over all OAM modes.

[0081] In some aspects, a transmitter may transmit a first reference signal set 510 (e.g., on an OAM mode set) and a second reference signal set 550 (e.g., on a preferred OAM mode set selected from the OAM mode set). The second reference signal set may enable a receiver to improve channel gain determination and / or a receiver's inter-mode interference matrix (e.g., ) to determine the accuracy.

[0082] As shown, the receiver may provide feedback 560 (e.g., second feedback) based at least in part on the reference signal 550. The feedback 560 may include some or all of the information described with respect to the feedback 530. For example, the feedback 560 may indicate one or more preferred OAM modes selected from the one or more OAM modes over which the reference signal 550 is transmitted, channel parameters associated with the one or more OAM modes, receiver parameters associated with the one or more OAM modes, and the like.

[0083] As indicated by reference numeral 570, the transmitter may select one or more OAM modes based at least in part on feedback, such as feedback 530 and / or feedback 560. In some aspects, the transmitter may select the one or more OAM modes based at least in part on the one or more OAM modes being associated with one or more highest channel gain and / or SINR values, based at least in part on the one or more OAM modes being associated with channel gain and / or SINR values ​​that satisfy a threshold, based at least in part on the one or more OAM modes providing the highest expected channel gain and / or SINR, and / or based at least in part on one or more other criteria.

[0084] As shown by reference numeral 580, the transmitter may use the one or more selected OAM modes to transmit communications based on OAM multiplexing. For example, the transmitter may configure one or more transmitter apertures (e.g., transmitter aperture 315, etc.) based at least in part on the one or more selected OAM modes, and may transmit communications based on OAM multiplexing including one or more layers corresponding to the one or more selected OAM modes. In some aspects, the transmitter may transmit an indication of the one or more selected OAM modes to the receiver. In this case, the receiver may configure one or more receiver apertures (e.g., receiver aperture 320, etc.) based at least in part on the one or more selected OAM modes. Thus, the receiver informs the transmitter of channel parameters, receiver parameters, and / or preferred OAM modes for communications based on OAM multiplexing via feedback on one or more signals. The transmitter may select one or more selected OAM modes for communications based on OAM multiplexing based at least in part on feedback and / or one or more other factors. In this way, channel gain and / or SINR and thus throughput are improved in a communication system based on OAM multiplexing.

[0085] As indicated above, Figure 5 are provided as examples. Other examples may differ from those described herein. Figure 5 Examples described.

[0086] Figure 6 6 is a diagram illustrating an example 600 of a Bessel function output that may be used in conjunction with a selection of an OAM mode by a transmitter in accordance with the present disclosure. Figure 3 The sender, sender 405, Figure 5 The transmitting party, etc.) may be based at least in part on the receiving party (e.g., UE 120, BS 110, Figure 3 The receiver, receiver 410, Figure 5 The selection of the OAM mode may be performed based at least in part on feedback from a transmitter (e.g., a receiver, etc.) and / or based at least in part on one or more transmitter parameters. "Transmitter parameters" refers to measurements or other information about the transmitter. Examples of transmitter parameters include the aperture radius R of the transmitter. tx (e.g., the distance from the midpoint of a UCA antenna or aperture to the transmitting antenna of that UCA antenna or aperture) and the wavelength λ associated with the transmitting UCA antenna or aperture.

[0087] If the transmitter is using a uniform circular array (UCA) antenna (such as a Figure 3 and 4 The OAM mode l at the receiver can be calculated if the UCA antenna described above is implemented i The received signal is used to generate the factor factor Can be used with OAM mode i The channel gain is proportional to i (·) represents the first-order Bessel function of the first kind. Therefore, if the transmitter receives the receiver parameter R rx (e.g., the receiver aperture radius) and a channel parameter indicating the propagation path distance d, the transmitter can be based on the wavelength λ and the transmitter aperture radius R tx The sender parameters are determined Example Bessel function values ​​are shown in example 600. According to example 600, for a given value z (where z represents R rx , R tx , d, λ), the transmitter can determine the function value J for a specific parameter v (i.e., for a specific OAM mode) v (z). Finally, the sender chooses The OAM mode with the largest value is because given the receiver parameters, transmitter parameters and / or channel parameters (which include z) is proportional to the channel gain of the corresponding OAM mode. For example, at a value z=15, the transmitter may select an OAM mode corresponding to the Bessel function shown in reference numeral 610 because the selected OAM mode is expected to have the highest channel gain at the receiver based at least in part on the receiver parameters, channel parameters, and transmitter parameters used to determine z. It can be seen that if the propagation path distance d is much larger than the Rx aperture (i.e., d>>R rx ),but

[0088] The above-described techniques for selecting an OAM mode may be applied to selection of a preferred OAM mode for further reference signals, as described with reference numeral 540, and / or to selection of a selected OAM mode for OAM multiplexing-based communication, as described with reference numeral 570. In some aspects, the above-described techniques may be combined with other techniques for selecting an OAM mode, or another technique may be used in place of the above-described techniques for selecting an OAM mode.

[0089] As indicated above, Figure 6 is provided as one or more examples. Other examples are possible and may differ from the description of Figure 6 Examples described.

[0090] Figure 7 700 is a diagram illustrating an example process 700 performed, for example, by a transmitting party according to the present disclosure. The example process 700 is a diagram in which a transmitting party (eg, UE 120, BS 110, Figure 3 The transmitter, Figure 4The transmission side 405, Figure 5 An example of performing operations associated with mode determination for an OAM communication system.

[0091] like Figure 7 As shown in , in some aspects, process 700 may include: receiving feedback from a receiver associated with the OAM multiplexing-based communication (block 710). For example, the transmitter may receive feedback from the receiver associated with the OAM multiplexing-based communication (e.g., using antenna 234, DEMOD 232, MIMO detector 236, receive processor 238, controller / processor 240, receiver aperture 320, UCA antenna 415, UCA antenna 420, etc.).

[0092] like Figure 7 As further shown in FIG. 7 , in some aspects, process 700 may include determining a selected OAM mode for communicating with the receiver based at least in part on the feedback (block 720). For example, the transmitter (e.g., using antenna 234, DEMOD 232, MIMO detector 236, receive processor 238, controller / processor 240, receiver aperture 320, UCA antenna 415, UCA antenna 420, etc.) may determine a selected OAM mode for communicating with the receiver based at least in part on the feedback, as described above.

[0093] like Figure 7 As further shown in FIG. 7 , in some aspects, process 700 may include transmitting the OAM multiplexing-based communication to the receiver based at least in part on the selected OAM mode (block 730). For example, the transmitter (e.g., using antenna 234, DEMOD 232, MIMO detector 236, receive processor 238, controller / processor 240, transmitter aperture 315, UCA antenna 415, UCA antenna 420, etc.) may transmit the OAM multiplexing-based communication to the receiver based at least in part on the selected OAM mode, as described above.

[0094] Process 700 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0095] In a first aspect, process 700 includes transmitting a set of reference signals associated with a set of OAM modes including a selected OAM mode; and receiving feedback includes receiving feedback based at least in part on the set of reference signals from a recipient.

[0096] In a second aspect, alone or in combination with the first aspect, the set of reference signals is transmitted using the same radio resources.

[0097] In a third aspect, alone or in combination with one or more of the first and second aspects, the set of reference signals uses a preconfigured set of symbols.

[0098] In a fourth aspect, either alone or in combination with one or more of the first to third aspects, a first reference signal in the reference signal set is transmitted using a first radio resource, and a second reference signal in the reference signal set is transmitted using a second radio resource different from the first radio resource.

[0099] In a fifth aspect, either alone or in combination with one or more of the first to fourth aspects, the reference signal set comprises a first pair of reference signals associated with a first OAM mode in the OAM mode set and a second pair of reference signals associated with a second OAM mode in the OAM mode set, and the first pair of reference signals and the second pair of reference signals are transmitted using orthogonal cover codes.

[0100] In a sixth aspect, alone or in combination with one or more of the first to fifth aspects, each OAM mode in the set of OAM modes is associated with at least one reference signal in the set of reference signals.

[0101] In a seventh aspect, alone or in combination with one or more of the first to sixth aspects, the feedback indicates a set of channel gain values ​​corresponding to a set of OAM modes.

[0102] In an eighth aspect, either alone or in combination with one or more of the first to seventh aspects, the feedback indicates a preferred OAM mode set and a set of channel gain values ​​corresponding to the preferred OAM mode set, wherein the selected OAM mode is selected from the preferred OAM mode set.

[0103] In a ninth aspect, alone or in combination with one or more of the first to eighth aspects, the preferred OAM mode set is associated with a highest channel gain value of the OAM mode set.

[0104] In a tenth aspect, alone or in combination with one or more of the first to ninth aspects, the feedback indicates one or more receiver parameters associated with the receiver and one or more channel parameters associated with a set of OAM modes.

[0105] In the eleventh aspect, either alone or in combination with one or more of the first to tenth aspects, the one or more receiver parameters include an aperture radius of the receiver, and the one or more channel parameters include at least one of a propagation path distance associated with a reference signal set or a path loss associated with the reference signal set.

[0106] In a twelfth aspect, either alone or in combination with one or more of the first to eleventh aspects, process 700 includes: determining a channel gain set for a set of OAM modes based at least in part on the one or more receiver parameters and the one or more channel parameters; and selecting a selected OAM mode based at least in part on the channel gain set.

[0107] In the thirteenth aspect, either alone or in combination with one or more of the first to twelfth aspects, the channel gain set is determined at least in part based on a first-class Bessel function, wherein the first-class Bessel function receives as input the one or more receiver parameters, the one or more channel parameters, and one or more transmitter parameters associated with the transmitter, and wherein the first-class Bessel function outputs a factor for determining the channel gain set.

[0108] In a fourteenth aspect, alone or in combination with one or more of the first to thirteenth aspects, process 700 includes: transmitting one or more reference signals based on a preferred OAM mode set; receiving information from the receiving party indicating one or more preferred OAM modes in the preferred OAM mode set and one or more corresponding channel gains of the one or more preferred OAM modes; and selecting a selected OAM mode from the one or more preferred OAM modes based at least in part on the one or more corresponding channel gains.

[0109] In a fifteenth aspect, alone or in combination with one or more of the first to fourteenth aspects, the preferred OAM mode set is selected by the transmitter.

[0110] although Figure 7 An example block diagram of process 700 is shown, but in some aspects, process 700 may include Figure 7 Additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in the process 700. Additionally or alternatively, two or more blocks of the process 700 may be executed in parallel.

[0111] Figure 8 8 is a diagram illustrating an example process 800 performed, for example, by a receiver according to the present disclosure. The example process 800 is a diagram in which a receiver (eg, UE 120, BS 110, Figure 3 The recipient of Figure 4 The receiver 410, Figure 5 An example of performing operations associated with mode determination for an OAM communication system.

[0112] like Figure 8As shown in , in some aspects, process 800 may include: determining feedback associated with OAM multiplexing-based communication (block 810). For example, a receiver (e.g., using antenna 234, DEMOD 232, MIMO detector 236, receive processor 238, controller / processor 240, receiver aperture 320, UCA antenna 415, UCA antenna 420, etc.) may determine feedback associated with OAM multiplexing-based communication, as described above.

[0113] like Figure 8 As further shown in FIG. 8 , in some aspects, process 800 may include transmitting the feedback to a transmitter of the OAM multiplexing-based communication (block 820). For example, a receiver (e.g., using antenna 234, DEMOD 232, MIMO detector 236, receive processor 238, controller / processor 240, receiver aperture 315, receiver aperture 320, UCA antenna 415, UCA antenna 420, etc.) may transmit the feedback to a transmitter of the OAM multiplexing-based communication, as described above.

[0114] Process 800 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0115] In a first aspect, determining the feedback includes: receiving a set of reference signals associated with a set of OAM modes; and determining the feedback based at least in part on the set of reference signals.

[0116] In a second aspect, alone or in combination with the first aspect, the set of reference signals are received on the same radio resources.

[0117] In a third aspect, alone or in combination with one or more of the first and second aspects, the set of reference signals uses a preconfigured set of symbols.

[0118] In a fourth aspect, either alone or in combination with one or more of the first to third aspects, a first reference signal in the reference signal set is received on a first radio resource, and a second reference signal in the reference signal set is received on a second radio resource different from the first radio resource.

[0119] In a fifth aspect, either alone or in combination with one or more of the first to fourth aspects, the reference signal set comprises a first pair of reference signals associated with a first OAM mode in the OAM mode set and a second pair of reference signals associated with a second OAM mode in the OAM mode set, and the first pair of reference signals and the second pair of reference signals are received at least in part based on an orthogonal cover code.

[0120] In a sixth aspect, either alone or in combination with one or more of the first to fifth aspects, process 800 comprises: selecting a preferred OAM mode set based at least in part on the reference signal set, wherein the feedback indicates the preferred OAM mode set and a set of channel gain values ​​corresponding to the preferred OAM mode set.

[0121] In a seventh aspect, alone or in combination with one or more of the first to sixth aspects, the preferred OAM mode set is associated with a highest channel gain value of the OAM mode set.

[0122] In an eighth aspect, either alone or in combination with one or more of the first to seventh aspects, the selected OAM mode is selected from the two OAM modes based at least in part on the two OAM modes having equal channel gains, based at least in part on the selected OAM mode having a mode index with a smaller absolute value.

[0123] In a ninth aspect, alone or in combination with one or more of the first to eighth aspects, the set of preferred OAM modes is selected based at least in part on an inter-mode mutual interference matrix.

[0124] In a tenth aspect, alone or in combination with one or more of the first to ninth aspects, each OAM mode in the set of OAM modes is associated with at least one corresponding reference signal in the set of reference signals.

[0125] In an eleventh aspect, alone or in combination with one or more of the first to tenth aspects, process 800 includes receiving the OAM multiplexing-based communication based at least in part on the selected OAM mode determined at least in part based on the feedback.

[0126] In a twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, the feedback indicates a set of channel gain values ​​corresponding to a set of OAM modes.

[0127] In a thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, the feedback indicates one or more receiver parameters associated with the receiver and one or more channel parameters associated with a set of OAM modes.

[0128] In the fourteenth aspect, either alone or in combination with one or more of the first to thirteenth aspects, the one or more receiver parameters include an aperture radius of the receiver, and the one or more channel parameters include at least one of a propagation path distance associated with a reference signal set or a path loss associated with the reference signal set.

[0129] In a fifteenth aspect, either alone or in combination with one or more of the first to fourteenth aspects, process 800 comprises: receiving one or more reference signals on a selected OAM mode set selected based at least in part on the feedback; selecting one or more preferred OAM modes in the selected OAM mode set and one or more corresponding channel gains of the one or more preferred OAM modes; and transmitting information indicating the one or more preferred OAM modes.

[0130] although Figure 8 An example block diagram of process 800 is shown, but in some aspects, process 800 may include Figure 8 Additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in the process 800. Additionally or alternatively, two or more blocks of process 800 may be executed in parallel.

[0131] The following provides an overview of some aspects of the disclosure:

[0132] Aspect 1: A wireless communication method performed by a transmitter, comprising: receiving feedback from a receiver associated with a communication based on orbital angular momentum (OAM) multiplexing; determining a selected OAM mode for communicating with the receiver based at least in part on the feedback; and transmitting the OAM multiplexing-based communication to the receiver based at least in part on the selected OAM mode.

[0133] Aspect 2: The method of aspect 1 further comprises: transmitting a reference signal set associated with the OAM mode set including the selected OAM mode, wherein receiving the feedback comprises: receiving feedback based at least in part on the reference signal set from the recipient.

[0134] Aspect 3: The method of aspect 2, wherein the reference signal set is transmitted using the same radio resources.

[0135] Aspect 4: The method of Aspect 2, wherein the reference signal set uses a preconfigured codeword set.

[0136] Aspect 5: The method of Aspect 2, wherein a first reference signal in the reference signal set is transmitted using a first radio resource, and a second reference signal in the reference signal set is transmitted using a second radio resource different from the first radio resource.

[0137] Aspect 6: A method as in Aspect 2, wherein the reference signal set includes a first pair of reference signals associated with a first OAM mode in the OAM mode set and a second pair of reference signals associated with a second OAM mode in the OAM mode set, and wherein the first pair of reference signals and the second pair of reference signals are transmitted using orthogonal cover codes.

[0138] Aspect 7: The method of Aspect 2, wherein each OAM mode in the OAM mode set is associated with at least one reference signal in the reference signal set.

[0139] Aspect 8: The method of Aspect 1, wherein the feedback indicates a set of channel gain values ​​corresponding to a set of OAM modes.

[0140] Aspect 9: The method of aspect 1, wherein the feedback indicates a preferred OAM mode set and a set of channel gain values ​​corresponding to the preferred OAM mode set, wherein the selected OAM mode is selected from the preferred OAM mode set.

[0141] Aspect 10: The method of Aspect 9, wherein the preferred OAM mode set is associated with a highest channel gain value of the OAM mode set.

[0142] Aspect 11: The method of aspect 1, wherein the feedback indicates one or more receiver parameters associated with the receiver and one or more channel parameters associated with the OAM mode set.

[0143] Aspect 12: A method as in Aspect 11, wherein the one or more receiver parameters include an aperture radius of the receiver, and the one or more channel parameters include at least one of a propagation path distance associated with a reference signal set or a path loss associated with the reference signal set.

[0144] Aspect 13: The method of Aspect 11 further comprises: determining a channel gain set of the OAM mode set based at least in part on the one or more receiver parameters and the one or more channel parameters; and selecting the selected OAM mode based at least in part on the channel gain set.

[0145] Aspect 14: A method as in Aspect 13, wherein the channel gain set is determined at least in part based on a first-class Bessel function, wherein the first-class Bessel function receives as input the one or more receiver parameters, the one or more channel parameters, and one or more transmitter parameters associated with the transmitter, and wherein the first-class Bessel function outputs a factor for determining the channel gain set.

[0146] Aspect 15: The method of Aspect 13 further includes: transmitting one or more reference signals based on a preferred OAM mode set; receiving information indicating one or more preferred OAM modes in the preferred OAM mode set and one or more corresponding channel gains of the one or more preferred OAM modes from the receiving party; and selecting a selected OAM mode from the one or more preferred OAM modes based at least in part on the one or more corresponding channel gains.

[0147] Aspect 16: The method of Aspect 15, wherein the preferred OAM mode set is selected by the transmitter.

[0148] Aspect 17: A wireless communication method performed by a receiving party, comprising: determining feedback associated with communication based on orbital angular momentum (OAM) multiplexing; and transmitting the feedback to a transmitting party of the communication based on OAM multiplexing.

[0149] Aspect 18: The method of aspect 17, wherein determining the feedback comprises: receiving a reference signal set associated with an OAM mode set; and determining the feedback based at least in part on the reference signal set.

[0150] Aspect 19: The method of Aspect 18, wherein the reference signal set is received on the same radio resource.

[0151] Aspect 20: The method of aspect 18, wherein the reference signal set uses a preconfigured codeword set.

[0152] Aspect 21: The method of Aspect 18, wherein a first reference signal in the reference signal set is received on a first radio resource, and a second reference signal in the reference signal set is received on a second radio resource different from the first radio resource.

[0153] Aspect 22: A method as in Aspect 18, wherein the reference signal set includes a first pair of reference signals associated with a first OAM mode in the OAM mode set and a second pair of reference signals associated with a second OAM mode in the OAM mode set, and wherein the first pair of reference signals and the second pair of reference signals are received at least in part based on orthogonal cover codes.

[0154] Aspect 23: The method of aspect 18, further comprising: selecting a preferred OAM mode set based at least in part on the reference signal set, wherein the feedback indicates the preferred OAM mode set and a set of channel gain values ​​corresponding to the preferred OAM mode set.

[0155] Aspect 24: The method of Aspect 23, wherein the preferred OAM mode set is associated with a highest channel gain value of the OAM mode set.

[0156] Aspect 25: The method of aspect 24, wherein, based at least in part on the two OAM modes having equal channel gains, the selected OAM mode is selected from the two OAM modes based at least in part on the selected OAM mode having a mode index with a smaller absolute value.

[0157] Aspect 26: The method of Aspect 24, wherein the preferred OAM mode set is selected based at least in part on an inter-mode interference matrix.

[0158] Aspect 27: The method of aspect 18, wherein each OAM mode in the set of OAM modes is associated with at least one corresponding reference signal in the set of reference signals.

[0159] Aspect 28: The method of Aspect 18, further comprising: receiving the OAM multiplexing-based communication based at least in part on the selected OAM mode determined at least in part based on the feedback.

[0160] Aspect 29: The method of Aspect 17, wherein the feedback indicates a set of channel gain values ​​corresponding to a set of OAM modes.

[0161] Aspect 30: The method of Aspect 17, wherein the feedback indicates one or more receiver parameters associated with the receiver and one or more channel parameters associated with the OAM mode set.

[0162] Aspect 31: A method as in Aspect 30, wherein the one or more receiver parameters include an aperture radius of the receiver, and the one or more channel parameters include at least one of a propagation path distance associated with a reference signal set or a path loss associated with the reference signal set.

[0163] Aspect 32: The method of Aspect 30 further includes: receiving one or more reference signals on a selected OAM mode set selected at least in part based on the feedback; selecting one or more preferred OAM modes in the selected OAM mode set and one or more corresponding channel gains of the one or more preferred OAM modes; and transmitting information indicating the one or more preferred OAM modes.

[0164] Aspect 33: An apparatus for wireless communication at a device, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method as in one or more of Aspects 1-32.

[0165] Aspect 34: An apparatus for wireless communication, comprising a memory and one or more processors coupled to the memory, the one or more processors configured to perform the method of one or more aspects of aspects 1-32.

[0166] Aspect 35: An apparatus for wireless communication, comprising at least one means for performing the method of one or more aspects of aspects 1-32.

[0167] Aspect 36: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method of one or more aspects of aspects 1-32.

[0168] Aspect 37: A non-transitory computer-readable medium storing an instruction set for wireless communication, the instruction set comprising one or more instructions that, when executed by one or more processors of a device, cause the device to perform a method as in one or more aspects of aspects 1-32.

[0169] The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit the aspects to the precise forms disclosed. Modifications and variations may be made in light of the above disclosure or may be acquired by practice of the various aspects.

[0170] As used herein, the term "component" is intended to be broadly interpreted as a combination of hardware and / or hardware and software. "Software" should be broadly interpreted as meaning instructions, instruction sets, codes, code segments, program codes, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, and / or functions, etc., whether it is described in software, firmware, middleware, microcode, hardware description language or other terms. As used herein, processors are implemented with hardware, and / or a combination of hardware and software. It will be obvious that the systems and / or methods described herein can be implemented in different forms of hardware, and / or a combination of hardware and software. The actual dedicated control hardware or software code for implementing these systems and / or methods does not limit various aspects. Thus, the operation and behavior of these systems and / or methods are described herein without reference to specific software codes--it is understood that software and hardware can be designed to implement these systems and / or methods based at least in part on the description herein.

[0171] As used herein, satisfying a threshold may refer to a value being greater than a threshold, greater than or equal to a threshold, less than a threshold, less than or equal to a threshold, equal to a threshold, not equal to a threshold, etc., depending on the context.

[0172] Although specific feature combinations are described in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of various aspects. In fact, many of these features can be combined in a manner not specifically described in the claims and / or undisclosed in the specification. Although each dependent claim listed below can be directly subordinate to only one claim, the disclosure of various aspects includes that each dependent claim is combined with each other claim in this group of claims. As used herein, the phrase quoting "at least one of" a column of items refers to any combination of these items, including single members. As an example, "at least one of a, b or c" is intended to cover: a, b, c, ab, ac, bc and abc, and any combination with multiple identical elements (for example, aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc and ccc, or any other sorting of a, b and c).

[0173] Elements, actions or instructions used herein should not be interpreted as key or necessary unless explicitly described as such. Moreover, as used herein, the articles "one" and "a" are intended to include one or more projects, and can be used interchangeably with "one or more". In addition, as used herein, the article "the" is intended to include one or more projects quoted in conjunction with the article "the", and can be used interchangeably with "one or more". In addition, as used herein, the terms "set (set)" and "group" are intended to include one or more projects (for example, related items, non-related items, or a combination of related items and non-related items), and can be used interchangeably with "one or more". In the occasion of intending to have only one project, the phrase "only one" or similar language is used. Moreover, as used herein, the terms "having", "containing", "including" etc. are intended to be open terms. In addition, the phrase "based on" is intended to mean "based at least in part on", unless otherwise explicitly stated. Furthermore, as used herein, the term "or" when used in a sequence is intended to be inclusive and may be used interchangeably with "and / or" unless explicitly stated otherwise (e.g., when used in conjunction with "either of" or "only one of").

Claims

1. An apparatus for wireless communication at a transmitting party, comprising: Memory; as well as one or more processors coupled to the memory, the one or more processors configured to: receiving feedback from a receiving party associated with communications based on orbital angular momentum (OAM) multiplexing, wherein the feedback indicates a set of channel gain values ​​or signal-to-interference-plus-noise ratio values ​​for each polarization for a preferred OAM mode; determining a selected OAM mode for communicating with the recipient based at least in part on the feedback; as well as The OAM multiplexing-based communication is transmitted to the recipient based at least in part on the selected OAM mode.

2. The device according to claim 1, wherein: The one or more processors are further configured to transmit a set of reference signals associated with a set of OAM modes including the selected OAM mode, wherein receiving the feedback comprises: The feedback based at least in part on the set of reference signals is received from the recipient.

3. The device as claimed in claim 2, wherein: The reference signal sets are transmitted using the same radio resources.

4. The device according to claim 2, wherein: The reference signal set uses a preconfigured set of symbols.

5. The device according to claim 2, wherein: A first reference signal in the set of reference signals is transmitted using a first radio resource, and a second reference signal in the set of reference signals is transmitted using a second radio resource different from the first radio resource.

6. The device according to claim 2, wherein: The set of reference signals includes a first pair of reference signals associated with a first OAM mode in the set of OAM modes and a second pair of reference signals associated with a second OAM mode in the set of OAM modes, and wherein the first pair of reference signals and the second pair of reference signals are transmitted using orthogonal cover codes.

7. The device of claim 2, wherein: Each OAM mode in the set of OAM modes is associated with at least one reference signal in the set of reference signals.

8. The device of claim 2, wherein: The set of reference signals includes a first reference signal and a second reference signal associated with an OAM mode, wherein the first reference signal and the second reference signal are in different polarizations.

9. The device of claim 1, wherein: The feedback further indicates a set of channel gain values ​​corresponding to the set of OAM modes.

10. The device of claim 1, wherein: The feedback further indicates a set of preferred OAM modes and a set of channel gain values ​​corresponding to the set of preferred OAM modes, wherein the selected OAM mode is selected from the set of preferred OAM modes.

11. The device of claim 10, wherein: The preferred OAM mode set is associated with a highest channel gain or signal to interference plus noise ratio value of the OAM mode set.

12. The device of claim 1, wherein: The feedback further indicates one or more receiver parameters associated with the receiver and one or more channel parameters associated with a set of OAM modes.

13. The device of claim 12, wherein: The one or more receiver parameters include an aperture radius of the receiver, and the one or more channel parameters include at least one of a propagation path distance associated with a set of reference signals or a path loss associated with the set of reference signals.

14. The device of claim 12, wherein: The one or more processors are further configured to: determining a set of channel gains for the set of OAM modes based at least in part on the one or more receiver parameters and the one or more channel parameters; and The selected OAM mode is selected based at least in part on the set of channel gains.

15. The device of claim 14, wherein: The set of channel gains is determined at least in part based on a first-class Bessel function, wherein the first-class Bessel function receives as input the one or more receiver parameters, the one or more channel parameters, and one or more transmitter parameters associated with the transmitter, and wherein the first-class Bessel function outputs factors used to determine the set of channel gains.

16. The device of claim 14, wherein: The one or more processors are further configured to: transmitting one or more reference signals based on a preferred OAM mode set; receiving, from the receiving party, information indicating one or more preferred OAM modes in the preferred OAM mode set and one or more corresponding channel gains of the one or more preferred OAM modes; as well as The selected OAM mode is selected from the one or more preferred OAM modes based at least in part on the one or more corresponding channel gains.

17. The device of claim 16, wherein: The preferred OAM mode set is selected by the transmitter.

18. An apparatus for wireless communication at a receiving end, comprising: Memory; as well as one or more processors coupled to the memory, the one or more processors configured to: determining feedback associated with orbital angular momentum (OAM) multiplexing-based communications, wherein the feedback indicates a set of channel gain values ​​or signal-to-interference-plus-noise ratio values ​​for each polarization of a preferred OAM mode; as well as The feedback is transmitted to a transmitter of the OAM multiplexing-based communication.

19. The device of claim 18, wherein: The one or more processors are configured to: receiving a set of reference signals associated with a set of OAM patterns; and The feedback is determined based at least in part on the set of reference signals.

20. The device of claim 19, wherein: The set of reference signals are received on the same radio resources.

21. The apparatus of claim 19, wherein: The reference signal set uses a preconfigured set of symbols.

22. The apparatus of claim 19, wherein: A first reference signal in the set of reference signals is received on a first radio resource, and a second reference signal in the set of reference signals is received on a second radio resource different from the first radio resource.

23. The apparatus of claim 19, wherein: The set of reference signals includes a first pair of reference signals associated with a first OAM mode in the set of OAM modes and a second pair of reference signals associated with a second OAM mode in the set of OAM modes, and wherein the first pair of reference signals and the second pair of reference signals are received based at least in part on an orthogonal cover code.

24. The apparatus of claim 19, wherein: The set of reference signals includes a first reference signal and a second reference signal associated with an OAM mode, wherein the first reference signal and the second reference signal are in different polarizations.

25. The apparatus of claim 18, wherein: The one or more processors are further configured to: Information indicating a capability to support a number of polarizations is transmitted, wherein the capability is per OAM mode.

26. A wireless communication method performed by a transmitting party, comprising: receiving feedback from a receiving party associated with communications based on orbital angular momentum (OAM) multiplexing, wherein the feedback indicates a set of channel gain values ​​or signal-to-interference-plus-noise ratio values ​​for each polarization for a preferred OAM mode; determining a selected OAM mode for communicating with the recipient based at least in part on the feedback; as well as The OAM multiplexing-based communication is transmitted to the recipient based at least in part on the selected OAM mode.

27. The method of claim 26, further comprising: transmitting a set of reference signals associated with a set of OAM modes including the selected OAM mode, wherein receiving the feedback comprises: The feedback based at least in part on the set of reference signals is received from the recipient.

28. A wireless communication method performed by a receiving party, comprising: determining feedback associated with orbital angular momentum (OAM) multiplexing-based communications, wherein the feedback indicates a set of channel gain values ​​or signal-to-interference-plus-noise ratio values ​​for each polarization of a preferred OAM mode; as well as The feedback is transmitted to a transmitter of the OAM multiplexing-based communication.

29. The method of claim 28, wherein: Determining that the feedback includes: receiving a set of reference signals associated with a set of OAM patterns; and The feedback is determined based at least in part on the set of reference signals.

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