Amplitude modulated phase tracking reference signal for multi-layer communication links

Abstract

In general, aspects of the present disclosure relate to wireless communications. In some aspects, a user equipment may perform the following operations: sending an indication of the UE's ability to transmit one or more of an uplink transmission or a downlink transmission having an amplitude modulated phase tracking reference signal on at least a first layer of a multi-layer communication link including a first layer and a second layer; and transmitting an uplink transmission or a downlink transmission based at least in part on the indication. A number of other aspects are provided.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This patent application claims the benefit of priority of U.S. Provisional Patent Application No. 63 / 033,602, filed on June 2, 2020, and entitled “AMPLITUDE-MODULATED PHASE TRACKING REFERENCE SIGNALS FOR A MULTILAYERCOMMUNICATION LINK,” and U.S. Non-Provisional Patent Application No. 17 / 308,745, filed on May 5, 2021, and entitled “AMPLITUDE-MODULATED PHASE TRACKING REFERENCE SIGNALS FOR AMULTILAYERCOMMUNICATION LINK,” and the above applications are hereby expressly incorporated herein by reference. Technical Field

[0003]

[0006] Generally speaking, aspects of the present disclosure relate to wireless communications and to techniques and apparatus for amplitude modulated phase tracking reference signals for multi-layer communication links. Background Art

[0004] 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 released by the Third Generation Partnership Project (3GPP).

[0005] A wireless network may include multiple base stations (BSs) that can support communications for multiple user equipments (UEs). A UE may communicate with a BS via a downlink and an uplink. 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 receive point (TRP), new radio (NR) BS, 5G Node B, etc.

[0006] The above multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different user devices 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 released by 3GPP. NR is designed to better integrate with other open standards by improving spectrum efficiency, reducing costs, improving services, utilizing new spectrum, and 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, so as to better support mobile broadband Internet access. As the demand for mobile broadband access continues to grow, further improvements to LTE, NR and other wireless access technologies are still useful. Summary of the invention

[0007] In some aspects, a method of wireless communication performed by a user equipment (UE) may include: sending an indication of the UE's ability to transmit one or more of an uplink transmission or a downlink transmission having an amplitude modulated phase tracking reference signal (PT-RS) on at least the first layer of a multi-layer communication link including a first layer and a second layer; and transmitting the uplink transmission or the downlink transmission based at least in part on the indication.

[0008] In some aspects, a method of wireless communication performed by a base station may include: receiving an indication of a UE's ability to transmit one or more of an uplink transmission or a downlink transmission having an amplitude modulated PT-RS on at least the first layer of a multi-layer communication link including a first layer and a second layer; and transmitting an uplink transmission or a downlink transmission based at least in part on the indication.

[0009] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of a UE, may cause the one or more processors to perform the following operations: sending an indication of the UE's ability to transmit one or more of an uplink transmission or a downlink transmission with an amplitude modulated PT-RS on at least a first layer of a multi-layer communication link including a first layer and a second layer; and transmitting an uplink transmission or a downlink transmission based at least in part on the indication.

[0010] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of a base station, may cause the one or more processors to perform the following operations: receiving an indication of a UE's ability to transmit one or more of an uplink transmission or a downlink transmission having an amplitude modulated PT-RS on at least a first layer of a multi-layer communication link including a first layer and a second layer; and transmitting an uplink transmission or a downlink transmission based at least in part on the indication.

[0011] In some aspects, a user equipment for wireless communication may include a memory and one or more processors coupled to the memory. The memory and the one or more processors may be configured to: send an indication of the UE's ability to transmit one or more of an uplink transmission or a downlink transmission with an amplitude modulated PT-RS on at least a first layer of a multi-layer communication link including the first layer and the second layer; and transmit an uplink transmission or a downlink transmission based at least in part on the indication.

[0012] In some aspects, a base station for wireless communication may include a memory and one or more processors coupled to the memory. The memory and the one or more processors may be configured to: receive an indication of a UE's ability to transmit one or more of an uplink transmission or a downlink transmission having an amplitude modulated PT-RS on at least a first layer of a multi-layer communication link including the first layer and the second layer; and transmit an uplink transmission or a downlink transmission based at least in part on the indication.

[0013] In some aspects, an apparatus for wireless communication may include: a unit for sending an indication of the apparatus's ability to transmit one or more of an uplink transmission or a downlink transmission having an amplitude modulated PT-RS on at least a first layer of a multi-layer communication link including a first layer and a second layer; and a unit for transmitting the uplink transmission or the downlink transmission based at least in part on the indication.

[0014] In some aspects, an apparatus for wireless communication may include: a unit for receiving an indication of a UE's ability to transmit one or more of an uplink transmission or a downlink transmission having an amplitude modulated PT-RS on at least a first layer of a multi-layer communication link including a first layer and a second layer; and a unit for transmitting an uplink transmission or a downlink transmission based at least in part on the indication.

[0015] In summary, aspects include methods, apparatus, systems, computer program products, non-transitory computer-readable media, user equipment, base stations, wireless communication devices, and / or processing systems as fully described herein with reference to and as illustrated by the accompanying drawings and description.

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

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

[0018] In order to fully understand the above features of the present disclosure, a more specific description of the above brief summary can be obtained by referring to various aspects (some of which are shown in the accompanying drawings). However, it should be noted that the accompanying drawings only show some typical aspects of the present disclosure and are therefore not considered to limit the scope of the present disclosure, as the description may allow for other equally effective aspects. The same reference numerals in different drawings may identify the same or similar elements.

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

[0020] Figure 2 is a schematic diagram showing an example of communication between a base station and a UE in a wireless network according to the present disclosure.

[0021] Figure 3 is a schematic diagram illustrating an example phase tracking reference signal structure in a physical downlink shared channel according to the present disclosure.

[0022] Figure 4 is a schematic diagram illustrating an example of an amplitude modulated phase tracking reference signal for a multi-layer communication link according to the present disclosure.

[0023] Figure 5 is a schematic diagram illustrating an example of an amplitude modulated phase tracking reference signal according to the present disclosure.

[0024] Figure 6 is a schematic diagram illustrating an example of transmission of an amplitude modulated phase tracking reference signal according to a configuration of the present disclosure.

[0025] Figure 7 is a schematic diagram illustrating an example of receiving a transmission having an amplitude modulated phase tracking reference signal in accordance with the present disclosure.

[0026] Figure 8 is a schematic diagram illustrating an example of processing and performing amplitude demodulation for an amplitude modulated phase tracking reference signal according to the present disclosure.

[0027] Fig. 9 is a schematic diagram illustrating an example process performed, for example, by a user device according to the present disclosure.

[0028] Fig.10 is a schematic diagram illustrating an example process performed, for example, by a base station according to the present disclosure. DETAILED DESCRIPTION

[0029] The following is a more complete description of various aspects of the present disclosure with reference to the accompanying drawings. However, the present disclosure can be embodied in many different forms and should not be construed as being limited to any specific structure or function presented throughout the present disclosure. More specifically, these aspects are provided so that the present disclosure will be thorough and complete, and the scope of the present disclosure will be fully conveyed to those skilled in the art. Based on the teachings herein, it should be understood by those skilled in the art that the scope of the present disclosure is intended to cover any aspect of the present disclosure disclosed herein, whether the aspect is implemented independently of any other aspect of the present disclosure or implemented in combination with any other aspect. For example, using any number of aspects set forth herein, a device can be implemented or a method can be implemented. In addition, the scope of the present disclosure is intended to cover such a device or method implemented using other structures, functions, or structures and functions other than the various aspects of the present disclosure set forth herein or different from 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 embodied by one or more elements of the claims.

[0030] Several aspects of telecommunication systems will now be presented with reference to various devices and techniques. These devices and techniques will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as "elements"). These elements may be implemented using hardware, software, or a combination thereof. Whether such elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0031] It should be noted that although 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 beyond 5G (e.g., 6G).

[0032] Figure 11 is a schematic diagram showing an example of a wireless network 100 according to the present disclosure. The wireless network 100 may be or may include elements of a 5G (NR) network and / or an LTE network, as well as other examples. The wireless network 100 may include a plurality of base stations 110 (shown as BS 110a, 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, Node B, gNB, 5G Node B (NB), access point, 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.

[0033] 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 subscription. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscription. 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. A BS may support one or more (e.g., three) cells. The terms "eNB", "base station", "NR BS", "gNB", "TRP", "AP", "Node B", "5G NB", and "cell" may be used interchangeably herein.

[0034] In some aspects, the cells may not necessarily be stationary, and the geographic area of ​​the cells 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 through various types of backhaul interfaces (such as direct physical connections or virtual networks) using any suitable transport network.

[0035] The wireless network 100 may also include a relay station. A relay station is an entity that can receive data transmissions from an upstream station (e.g., a BS or a UE) and send data transmissions to a downstream station (e.g., a UE or a BS). A relay station may also be a UE that is capable of relaying transmissions for other UEs. Figure 1 In the example shown in , a relay BS 110d may communicate with a macro BS 110a and a UE 120d to facilitate communication between the BS 110a and the UE 120d. A relay BS may also be referred to as a relay station, a relay base station, a relay, or the like.

[0036] 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).

[0037] A network controller 130 may be coupled to a set of BSs and may provide coordination and control for these BSs. The network controller 130 may communicate with the BSs via a backhaul. The BSs may also communicate with each other directly or indirectly via a wireless or wired backhaul.

[0038] UE 120 (e.g., 120a, 120b, 120c) can be dispersed throughout the wireless network 100, and each UE can be stationary or mobile. UE can also be referred to as an access terminal, terminal, mobile station, subscriber unit, station, etc. UE can be a cellular phone (e.g., a smart phone), a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet device, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or apparatus, a biometric sensor / device, a wearable device (smart watch, smart clothing, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet, etc.)), an entertainment device (e.g., a music or video device, or a satellite radio unit), a vehicle component or sensor, a smart meter / sensor, an industrial manufacturing device, a global positioning system device, or any other suitable device configured to communicate via a wireless or wired medium.

[0039] Some UEs may be considered as machine type communication (MTC) 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 a connection to a network (e.g., a wide area network such as the Internet or a cellular network) or a connection to a network, for example, via 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 customer premises 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 operationally coupled, communicatively coupled, electronically coupled, and / or electrically coupled.

[0040] Generally, any number of wireless networks can be deployed in a given geographic area. Each wireless network can support a specific RAT and can operate on one or more frequencies. RAT can also be referred to as radio technology, air interface, etc. Frequency can also be referred to as carrier, channel, etc. Each frequency can 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 can be deployed.

[0041] In some aspects, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly using one or more sidelink channels (e.g., without using base station 110 as an intermediary to communicate with each other). For example, UE 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocol (e.g., which may include vehicle-to-vehicle (V2V) protocol, or vehicle-to-infrastructure (V2I) protocol) and / or mesh network. 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.

[0042] Devices of the wireless network 100 may communicate using an electromagnetic spectrum, which may be subdivided into various categories, bands, channels, etc. based on frequency or wavelength. For example, devices of the wireless network 100 may communicate using an operating band having a first frequency range (FR1) (which may span from 410 MHz to 7.125 GHz), and / or may communicate using an operating band having a second frequency range (FR2) (which may span from 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 expressly stated, it should be understood that the term "sub-6 GHz" and the like (if used herein) can 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 expressly stated, it should be understood that the term "millimeter wave" and the like (if used herein) can 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 can be modified, and the techniques described herein are applicable to those modified frequency ranges.

[0043] As noted above, Figure 1 is provided as an example. Other examples may differ from those described above. Figure 1 Examples described.

[0044] Figure 2 1 is a diagram showing an example of base station 110 communicating with UE 120 in wireless network 100 according to the present disclosure. Base station 110 may be equipped with T antennas 234a through 234t, and UE 120 may be equipped with R antennas 252a through 252r, where in general, T≥1 and R≥1.

[0045] 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, if applicable, and may provide T output symbol streams to T modulators (MOD) 232a to 232t. Each modulator 232 may process a corresponding 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 up-convert) the output sample stream to obtain a downlink signal. T downlink signals from modulators 232a to 232t may be transmitted via T antennas 234a to 234t, respectively.

[0046] 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 (DEMOD) 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 (if 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, among other examples. In some aspects, one or more components of UE 120 may be included in housing 284.

[0047] 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.

[0048] Antennas (e.g., antennas 234a to 234t and / or antennas 252a to 252r) may include or may be included in one or more antenna panels, antenna groups, antenna element sets, and / or antenna arrays, among other examples. 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 antennas coupled to one or more transmitting and / or receiving components (such as Figure 2 One or more antenna elements of one or more components).

[0049] On the uplink, at the UE 120, a transmit processor 264 may receive and process data from a data source 262 and control information from a controller / processor 280 (e.g., for reports including RSRP, RSSI, RSRQ, and / or CQI). 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 (if 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 antennas 252, modulators and / or demodulators 254, MIMO detectors 256, receive processors 258, transmit processors 264, and / or TX MIMO processors 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 4-10 described).

[0050] 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 (if applicable), and further processed by the receive processor 238 to obtain decoded data and control information sent by the UE 120. The receive processor 238 may provide the decoded data to the data sink 239 and provide 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 antennas 234, modulators and / or demodulators 232, MIMO detectors 236, receive processors 238, transmit processors 220, and / or TX MIMO processors 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 4-10 described).

[0051] The controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2 Any other component in the base station 110 may perform one or more techniques associated with an amplitude modulated phase tracking reference signal (PT-RS) for a multi-layer communication link, as described in more detail elsewhere herein. For example, the controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2 Any other component in may perform or direct e.g. Fig. 9 The process of 900 Fig.10 1000 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, when executed by one or more processors of base station 110 and / or UE 120 (e.g., directly, or after compilation, conversion, and / or interpretation), the one or more instructions may cause the one or more processors, UE 120, and / or base station 110 to perform or direct, for example, Fig. 9 The process of 900 Fig.10 The operations of process 1000 and / or other processes as described herein. In some aspects, executing instructions may include running instructions, converting instructions, compiling instructions, and / or interpreting instructions, among other examples.

[0052] In some aspects, UE 120 may include: means for sending an indication of the UE's ability to transmit one or more of an uplink transmission or a downlink transmission having an amplitude modulated PT-RS on at least a first layer of a multi-layer communication link including the first layer and the second layer; means for transmitting the uplink transmission or the downlink transmission based at least in part on the indication; and so on. In some aspects, such means may include combining 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, etc.

[0053] In some aspects, base station 110 may include: means for receiving an indication of the UE's ability to transmit one or more of an uplink transmission or a downlink transmission having an amplitude modulated PT-RS on at least a first layer of a multi-layer communication link including the first layer and the second layer; means for transmitting an uplink transmission or a downlink transmission based at least in part on the indication; and the like. In some aspects, such means may include combining Figure 2 One 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.

[0054] Although Figure 2 The blocks in the 200 and 210 are shown as distinct components, but the functionality described above with respect to these blocks may be implemented in a single hardware, software, or combined component or in various combinations of components. For example, the functionality described with respect to the transmit processor 264, the receive processor 258, and / or the TX MIMO processor 266 may be performed by or under the control of the controller / processor 280.

[0055] As noted above, Figure 2 is provided as an example. Other examples may differ from those described above. Figure 2 Examples described.

[0056] Figure 3 3 is a diagram illustrating an example 300 of a phase tracking reference signal (PT-RS) structure in a physical downlink shared channel (PDSCH) according to the present disclosure. As shown, the PDSCH may include a plurality of subchannels (e.g., 36 subchannels) and a plurality of symbols (e.g., 14 symbols).

[0057] The base station may use the PDSCH to transmit PT-RS, DMRS, data, etc., and the UE may use the PDSCH to receive (e.g., or attempt to receive) PT-RS, DMRS, data, etc. Although described with reference to the PDSCH, the structure may be similarly applied to a physical uplink shared channel (PUSCH).

[0058] The PT-RS may be a pilot for the PDSCH and may have density in the frequency domain (eg, relative to a subcarrier) and the time domain (eg, relative to a symbol allocated for data). Figure 3 As shown in , PT-RS may have a density of 1 / 2 in the time domain and a density of 1 / 24 (eg, 1 per resource block) in the frequency domain. The UE may receive the PT-RS via a single port (eg, port 1000) or multiple ports.

[0059] In some examples, the PT-RS may be allocated using 1 resource (e.g., resource element or subchannel) per 2 resource blocks, 1 resource per 4 resource blocks, etc. In some examples, the PT-RS may be allocated using 1 resource element per resource block of 1 symbol, 1 resource element per resource block of 2 symbols, 1 resource element per resource block of 4 symbols, etc. The configuration of the PT-RS may be configured (e.g., using radio resource control (RRC) signaling) and / or may be based at least in part on an associated MCS of the PDSCH. The PT-RS may be defined by a Gold sequence.

[0060] As shown, the PDSCH may have multiple (e.g., 2) single-symbol DMRSs of one DMRS type (e.g., DMRS type 2). For example, the PDSCH may have 1 DMRS symbol per resource block. The receiving device may use the DMRS to roughly estimate and / or correct the frequency error within the symbol including the DMRS.

[0061] The PDSCH or PUSCH may include a PT-RS for a receiving device (e.g., a UE, a base station, etc.) to take into account the following: residual frequency offset (e.g., a frequency offset formed within a resource block or a time slot), phase noise (e.g., introduced by an oscillator at a transmitting device, a receiving device, etc.), CPE (e.g., a common phase rotation of subcarriers of the PDSCH, PUSCH, etc.), etc. For example, the receiving device may use the PT-RS to estimate and / or correct phase noise (e.g., based at least in part on the detected residual frequency offset, common phase error (CPE), etc.).

[0062] However, using PT-RS in dedicated symbols and / or resources in the PDSCH that may otherwise be allocated to data (e.g., application data) may reduce the potential throughput of the PDSCH. In some examples, the dedicated symbols and / or resources allocated for PT-RS may include 1 / 24 (approximately 4.16%) of the symbols and / or resources of the PDSCH. By allocating resources for PT-RS, the UE and / or base station may consume computing, communication, and / or network resources to schedule additional resources to compensate for the reduction in throughput caused by consuming resources for PT-RS.

[0063] As noted above, Figure 3 is provided as an example. Other examples may differ from those described above. Figure 3 Examples described.

[0064] In some aspects described herein, a UE and a base station may transmit using an amplitude modulated PT-RS on at least a first layer of a multi-layer communication link. In other words, a PDSCH or PUSCH may be transmitted in a case where data is multiplexed with a PT-RS sequence via amplitude modulation in resources allocated for PT-RS on the first layer. In some aspects, a UE may send an indication of the ability to transmit using an amplitude modulated PT-RS on at least a first layer of a multi-layer communication link (e.g., using resources that would otherwise be dedicated to PT-RS without additional data). In some aspects, a base station may send an indication (e.g., in downlink control information (DCI), a configured grant, etc.) that one or more uplink transmissions or downlink transmissions will be transmitted (e.g., transmitted or received) using an amplitude modulated PT-RS on at least a first layer of a multi-layer communication link. In some aspects, a UE may send a request to transmit one or more uplink transmissions or downlink transmissions with an amplitude modulated PT-RS on at least a first layer of a multi-layer communication link. In some aspects, a base station may send a request to transmit one or more uplink transmissions or downlink transmissions having an amplitude modulated PT-RS on at least a first layer of a multi-layer communication link.

[0065] Based at least in part on the UE indicating the capability to transmit using an amplitude modulated PT-RS on at least the first layer of a multi-layer communication link and / or the UE requesting to transmit using an amplitude modulated PT-RS on at least the first layer of a multi-layer communication link, the base station and / or the UE can save computational, communication, and / or network resources that might otherwise have been used to schedule additional resources to compensate for the use of dedicated resources for the PT-RS. In some aspects, the throughput of the PDSCH or PUSCH can be improved by approximately 3%.

[0066] Figure 4 4 is a schematic diagram of an example 400 of an amplitude modulated PT-RS for a multi-layer communication link according to the present disclosure. Figure 4 As shown in FIG. 1 , a UE (eg, UE 120) may communicate with a base station (eg, base station 110) using multiple layers of communication links. The UE and the base station may be part of a wireless network (eg, wireless network 100).

[0067] As indicated by reference numeral 405, the base station may send and the UE may receive configuration information. In some aspects, the UE may receive the configuration information from another device (e.g., from another base station, another UE, etc.). In some aspects, the UE may receive the configuration information via one or more of RRC signaling, medium access control (MAC) signaling (e.g., MAC control element (MAC CE)), etc. In some aspects, the configuration information may include an indication of one or more configuration parameters for the UE to select (e.g., already known to the UE), explicit configuration information for the UE to use to configure the UE, etc.

[0068] In some aspects, the configuration information may indicate that the UE will provide an indication of the UE's ability to transmit using an amplitude modulated PT-RS (e.g., for PUSCH, PDSCH, etc.) on at least one layer of a multi-layer communication link. In some aspects, the configuration information may indicate that the base station can transmit using an amplitude modulated PT-RS on at least one layer of a multi-layer communication link. For example, the base station may be configured to transmit using an amplitude modulated PT-RS on at least one layer of a multi-layer communication link based at least in part on receiving a request from the UE; based at least in part on the base station determining that a dedicated PT-RS is unnecessary, the base station determining that data can be sent using resources carrying a PT-RS on a first layer on a second layer of the multi-layer communication link; and so on.

[0069] In some aspects, the configuration information may indicate that the base station will provide an indication of whether to enable amplitude modulated PT-RS on at least one layer of a multi-layer communication link. In some aspects, the configuration information may indicate that the UE will be configured to transmit using amplitude modulated PT-RS on at least one layer of a multi-layer communication link for: a single transmission (e.g., uplink or downlink), a specified number of transmissions, a set of transmissions scheduled by a configured grant, transmissions within a specified time period, and the like.

[0070] In some aspects, the configuration information may indicate an MCS for symbols and / or resources used for amplitude modulated PT-RS. In some aspects, the configuration information may indicate an MCS difference between symbols and / or resources used for amplitude modulated PT-RS on a layer and symbols and / or resources used to send other data on the layer (e.g., in resources not configured for pilot). In some aspects, the configuration information may indicate a maximum MCS for symbols and / or resources used for amplitude modulated PT-RS.

[0071] As indicated by reference numeral 410, the UE may configure the UE for communication with the base station. In some aspects, the UE may configure the UE based at least in part on the configuration information. In some aspects, the UE may be configured to perform one or more operations described herein.

[0072] As indicated by reference numeral 415, the UE may send, and the base station may receive, an indication of the UE's ability to transmit (e.g., one or more of an uplink transmission or a downlink transmission) using an amplitude modulated PT-RS on at least one layer of a multi-layer communication link. For example, the UE may indicate the UE's ability to transmit using an amplitude modulated PT-RS based at least in part on the UE being configured to use an amplitude modulated PT-RS on at least one layer of a multi-layer communication link to determine and correct at least a portion of the CPE. In some aspects, the UE may send the indication via RRC signaling, one or more MAC CEs, a physical uplink control channel (PUCCH) message, etc.

[0073] In some aspects, a UE may indicate one or more ways in which the UE may transmit using an amplitude modulated PT-RS on at least one layer of a multi-layer communication link. For example, the UE may indicate whether the UE is capable of transmitting using an amplitude modulated PT-RS (e.g., having a known phase associated with a PT-RS sequence and a modulated amplitude for carrying data) on a set of resources on a first layer of the multi-layer communication link and using data (e.g., modulated using in-phase and quadrature (IQ) modulation) on the same set of resources on a second layer of the multi-layer communication link. Additionally or alternatively, the UE may indicate whether the UE is capable of transmitting using an amplitude modulated PT-RS on the set of resources on both the first layer and the second layer.

[0074] In some aspects, a UE may indicate whether the UE is capable of transmitting using PT-RS (e.g., without amplitude modulation) on a set of resources at a first layer and data on the set of resources at a second layer. Although described in the context of transmitting using amplitude modulated PT-RS on at least one layer of a multi-layer communication link, the techniques and methods described herein may be applied to transmitting using PT-RS on a set of resources at a first layer of a multi-layer communication link and transmitting data on the same set of resources at a second layer.

[0075] As indicated by reference numeral 420, the UE may determine to transmit uplink transmissions and / or receive downlink transmissions using an amplitude modulated PT-RS on at least one layer of a multi-layer communication link. In some aspects, the UE may determine to transmit using an amplitude modulated PT-RS on at least one layer of a multi-layer communication link based at least in part on one or more metrics such as: an amount of data buffered for an uplink transmission or a downlink transmission that meets a threshold, a size of a resource grant associated with one or more uplink transmissions or downlink transmissions (e.g., compared to the amount of data buffered for transmission), an RSRP associated with the UE that meets a threshold, a signal to interference plus noise ratio (SINR) that meets a threshold, and the like. In some aspects, the UE may determine to transmit using an amplitude modulated PT-RS on at least one layer of a multi-layer communication link based at least in part on historical metrics, current metrics, predicted metrics, and the like.

[0076] As indicated by reference numeral 425, a UE may send and a base station may receive a request for transmitting using an amplitude modulated PT-RS on at least one layer of a multi-layer communication link. In some aspects, the UE may send the request via a PUSCH transmission. In some aspects, the request may include a single-bit indicator as to whether an amplitude modulated PT-RS is requested for a transmission (uplink or downlink), a transmission set, or the like. In some aspects, the request may explicitly or implicitly indicate the UE's ability to transmit using an amplitude modulated PT-RS on at least one layer of a multi-layer communication link. For example, by sending the request, the UE may implicitly indicate that the UE is capable of transmitting using an amplitude modulated PT-RS on at least one layer of a multi-layer communication link.

[0077] In some aspects, a UE may send a request for use of an amplitude modulated PT-RS on at least one layer of a multi-layer communication link for one or more uplink transmissions or one or more downlink transmissions. The request may indicate whether the UE requests an amplitude modulated PT-RS on a single layer or multiple layers (e.g., a first layer and a second layer) of the multi-layer communication link, may identify the requested single layer or multiple layers, etc.

[0078] In some aspects, the request may apply to a single subsequent downlink transmission or uplink transmission, a set of downlink transmissions or uplink transmissions scheduled by a configured grant, a specified number of downlink transmissions or uplink transmissions, downlink transmissions or uplink transmissions within a specified time period, etc.

[0079] As indicated by reference numeral 430, the UE may send, and the base station may receive, a requested MCS for symbols and / or resources associated with an amplitude modulated PT-RS. For example, the UE may send a request for an MCS for symbols and / or resources associated with an amplitude modulated PT-RS. In some aspects, the request may explicitly indicate the requested MCS, may indicate a difference between the requested MCS for symbols and / or resources associated with an amplitude modulated PT-RS and an MCS for symbols and / or data associated with other data, and the like.

[0080] In some aspects, the request may identify a first MCS for a first layer of symbols and / or resources associated with an amplitude modulated PT-RS, a second MCS for a second layer of symbols and / or resources associated with an amplitude modulated PT-RS (e.g., the symbols and / or resources may carry data, amplitude modulated PT-RS, etc. on the second layer). In some aspects, the UE may send a request for an MCS along with a request for an amplitude modulated PT-RS on at least one layer of a multi-layer communication link, an indication of the UE's ability to transmit with an amplitude modulated PT-RS on at least one layer of a multi-layer communication link, a request to transmit with an amplitude modulated PT-RS on at least one layer of a multi-layer communication link, and the like.

[0081] As indicated by reference numeral 435, the base station may determine whether to transmit using an amplitude modulated PT-RS on at least one layer of a multi-layer communication link. For example, the base station may determine whether to follow a request from the UE to transmit using an amplitude modulated PT-RS on at least one layer of the multi-layer communication link, the base station may determine to transmit using an amplitude modulated PT-RS on at least one layer of the multi-layer communication link independent of a request from the UE, and the like. Additionally or alternatively, the base station may determine which layer or layers will have an amplitude modulated PT-RS, whether data will be carried on resources for a layer that does not have an amplitude modulated PT-RS (which carries an amplitude modulated PT-RS on at least one layer of the multi-layer communication link), and the like.

[0082] In some aspects, a base station may determine whether to comply with or not comply with a request from a UE based at least in part on one or more metrics such as: an amount of data buffered for downlink transmissions, a size of a resource grant for an associated transmission (e.g., the transmission to which the request applies), RSRP associated with the UE, movement of the UE, MCS used for upcoming communications, predicted condition changes for SINR, and the like.

[0083] In some aspects, a base station may determine, independent of a request from a UE, to transmit (e.g., an uplink transmission or a downlink transmission) utilizing an amplitude modulated PT-RS on at least one layer of a multi-layer communication link based, at least in part, on one or more metrics such as: a network load associated with the base station, an amount of data buffered for uplink transmissions or downlink transmissions that meets a threshold, a size of a resource grant associated with one or more uplink transmissions or downlink transmissions (e.g., compared to the amount of data buffered for the transmission), an RSRP associated with the UE that meets a threshold, an SINR that meets a threshold, the UE's ability to transmit utilizing an amplitude modulated PT-RS on at least one layer of the multi-layer communication link, etc. In some aspects, a base station may determine whether to transmit using an amplitude modulated PT-RS on at least one layer of a multi-layer communication link based, at least in part, on a historical metric, a current metric, a predicted metric, etc.

[0084] As indicated by reference numeral 440, the base station may send, and the UE may receive, an indication of transmitting using an amplitude modulated PT-RS. For example, the indication may indicate that the base station has approved a request from the UE; that the base station has determined to transmit using an amplitude modulated PT-RS (e.g., independent of or without a request from the UE); and the like. In some aspects, the base station may send, based at least in part on receiving an indication of the UE's capabilities, an indication that resources that would otherwise have been allocated for a dedicated PT-RS will be allocated for an amplitude modulated PT-RS on at least one layer of a multi-layer communication link. In some aspects, the base station may provide the indication via a DCI message (e.g., using one or more bits), a MAC CE, RRC signaling, and the like.

[0085] The indication may include an indication of whether the amplitude modulated PT-RS is to be used on a single layer or multiple layers (eg, a first layer and a second layer) of the multi-layer communication link, and may identify the requested single layer or multiple layers.

[0086] In some aspects, the indication may apply to a single subsequent downlink transmission or uplink transmission, a set of downlink transmissions or uplink transmissions scheduled by a configured grant, a specified number of downlink transmissions or uplink transmissions, downlink transmissions or uplink transmissions within a specified time period, and the like.

[0087] The base station may send, and the UE may receive, an indication of an MCS for an amplitude modulated PT-RS, as indicated by reference numeral 445. In other words, the base station may send an indication of an MCS for symbols and / or resources associated with an amplitude modulated PT-RS.

[0088] In some aspects, the MCS may be based at least in part on feedback signaling associated with a previous communication (e.g., via an outer loop adaptive loop). For example, for a previous transmission with an amplitude modulated PT-RS on at least one layer of a multi-layer communication link, the UE may send an acknowledgment or negative acknowledgment (ACK / NACK) signaling for a downlink transmission from a base station. Based at least in part on receiving an ACK, the base station may indicate an increase in the MCS, no change to the MCS, no indication of the MCS (e.g., implying no change to the MCS), etc. Based at least in part on receiving a NACK, the base station may indicate a decrease in the MCS, no change to the MCS, etc. In some aspects, the base station may indicate a change to the MCS using an explicit indication, a relative indication (e.g., an MCS relative to the MCS of a previous transmission), etc.

[0089] Similarly, the base station may send ACK / NACK signaling for uplink transmissions from the UE for a previous transmission with an amplitude modulated PT-RS on at least one layer of the multi-layer communication link. Based at least in part on the base station sending an ACK, the UE may request or the base station may indicate an increase in the MCS, no change to the MCS, no indication of the MCS (e.g., implying no change to the MCS), etc. Based at least in part on the base station sending a NACK, the UE may request or the base station may indicate a decrease in the MCS, no change to the MCS, etc. In some aspects, the UE may request or the base station may indicate a change to the MCS using an explicit indication, a relative indication (e.g., an MCS relative to the MCS of a previous transmission), etc.

[0090] In some aspects, the base station may provide an indication of the MCS via a DCI message (e.g., using one or more bits), a MAC CE, etc. In some aspects, the base station may send an indication of the MCS in a single message (e.g., a DCI message, MAC layer signaling, etc.) together with an indication of using an amplitude modulated PT-RS for transmission on at least one layer of a multi-layer communication link. For example, the DCI message may include 2 or more bits to indicate that the amplitude modulated PT-RS is enabled and / or indicate the MCS. The indication of the MCS may explicitly indicate the MCS, may indicate the difference between the MCS used for symbols and / or resources associated with the amplitude modulated PT-RS on at least one layer of the multi-layer communication link and the MCS used for symbols and / or resources associated with other data, and so on.

[0091] As indicated by reference numeral 450, the UE and the base station may transmit using an amplitude modulated PT-RS on at least one layer of a multi-layer communication link. For example, the UE and the base station may transmit uplink transmissions and / or downlink transmissions using an amplitude modulated PT-RS on at least one layer of a multi-layer communication link. In some aspects, the amplitude modulated PT-RS may include a PT-RS sequence multiplexed with data via amplitude modulation. For example, the amplitude modulated PT-RS may include a PT-RS sequence indicated by a phase of the amplitude modulated PT-RS and data indicated by an amplitude of the amplitude modulated PT-RS.

[0092] In some aspects, a UE may transmit (e.g., send and / or receive) an uplink transmission or a downlink transmission based at least in part on the assumption that the uplink transmission or the downlink transmission will be transmitted with an amplitude modulated PT-RS on at least one layer of the multi-layer communication link based at least in part on sending a request for an amplitude modulated PT-RS on at least one layer of the multi-layer communication link. In other words, the UE may assume that the base station will comply with the request to transmit using an amplitude modulated PT-RS on at least one layer of the multi-layer communication link without receiving additional signaling to confirm.

[0093] In some aspects, the UE and the base station may communicate using a first codeword for data carried on a first layer via a set of resources allocated for amplitude modulated PT-RS and a second codeword (e.g., different from the first codeword) for data carried on a second layer via the set of resources. In some aspects, the second codeword may be the same codeword for data carried on the second layer via an additional set of resources allocated for data.

[0094] In some aspects, data sent on symbols and / or resources associated with an amplitude modulated PT-RS may have a cyclic redundancy check (CRC) that is different from one or more CRCs associated with other data (e.g., other data on the same layer and / or other data on different layers) of an uplink transmission or a downlink transmission. In some aspects, a receiving device (e.g., a UE for downlink transmissions or a base station for uplink transmissions) may decode the data associated with the amplitude modulated PT-RS using a convolutional code.

[0095] In some aspects, data sent on resources associated with an amplitude modulated PT-RS may be associated with a dedicated ACK / NACK bit that is different from one or more ACK / NACK bits associated with other data sent via an uplink transmission or a downlink transmission. In some aspects, based at least in part on reporting a NACK for the amplitude modulated PT-RS, the base station may send a repetition of the amplitude modulated PT-RS via a subsequent PT-RS resource, and the UE may receive (e.g., attempt to decode) the repetition of the amplitude modulated PT-RS via the subsequent PT-RS resource.

[0096] In some aspects, the UE and the base station may transmit using an amplitude modulated PT-RS on a set of resources on a first layer and using an amplitude modulated PT-RS on the set of resources on a second layer. In some aspects, the UE and the base station may transmit using an amplitude modulated PT-RS on a set of resources on a first layer and using data on the set of resources on a second layer. In some aspects, the UE and the base station may transmit using a PT-RS on a set of resources on a first layer (e.g., without amplitude modulation) and using data on the set of resources on a second layer.

[0097] The UE may decode (e.g., demodulate, decode, receive, etc.) a downlink transmission having an amplitude modulated PT-RS and / or encode (e.g., modulate, encode, etc.) an uplink transmission having an amplitude modulated PT-RS, as indicated by reference numeral 455. Although various aspects are described with reference to a UE, a base station may similarly decode an uplink transmission having an amplitude modulated PT-RS and / or encode a downlink transmission having an amplitude modulated PT-RS.

[0098] In some aspects, the UE may determine that the downlink transmission has an amplitude modulated PT-RS based at least in part on: an indication of transmitting with an amplitude modulated PT-RS; a request to transmit with an amplitude modulated PT-RS; an indication of an ability to transmit with an amplitude modulated PT-RS; a determination that the PT-RS is amplitude modulated based at least in part on a change in amplitude of a resource associated with the PT-RS of the downlink transmission; etc. In some aspects, the UE may estimate the CPE based at least in part on the amplitude modulated PT-RS. In some aspects, the UE may attempt to extract data from the amplitude modulated PT-RS (e.g., after estimating the CPE).

[0099] In some aspects, the UE may perform (e.g., on the downlink transmission) minimum mean square error (MMSE) equalization on the downlink transmission to produce a first stream associated with the first layer and a second stream associated with the second layer. For symbols having at least one resource allocated for an amplitude modulated PT-RS, the UE may aggregate signals received via resources allocated for the amplitude modulated PT-RS. The UE may generate complex coefficients for corresponding symbols having at least one resource allocated for the amplitude modulated PT-RS based at least in part on the aggregated signals received via resources allocated for the amplitude modulated PT-RS. The UE may determine a CPE for the corresponding symbol having at least one resource allocated for the amplitude modulated PT-RS based at least in part on the complex coefficients. In some aspects, the UE may determine a common channel phase estimate for the first stream and the second stream based at least in part on the CPE.

[0100] In some aspects, the UE may apply an amplitude to a signal to be sent via the first layer (e.g., on an uplink transmission) based at least in part on data to be sent on a set of resources allocated for amplitude-modulated PT-RS. The UE may also apply a phase to the signal to be sent based at least in part on a known PT-RS sequence to be sent on a set of resources allocated for amplitude-modulated PT-RS.

[0101] In some aspects, the UE may remove a known PT-RS sequence from a portion of a downlink transmission received on resources allocated to the amplitude modulated PT-RS based at least in part on the phase of the amplitude modulated PT-RS. The UE may correct for channel impacts for the portion of the downlink transmission based at least in part on, for example, the DMRS. The UE may perform antenna combining and signal equalization for the portion of the downlink transmission, and then perform soft metric extraction to extract data indicated by the amplitude of the amplitude modulated PT-RS.

[0102] In some aspects, the UE may remove the known PT-RS sequence from the portion of the downlink transmission based at least in part on the phase of the amplitude modulated PT-RS. The UE may correct for channel impacts for the portion of the downlink transmission based at least in part on, for example, the DMRS. The UE may aggregate the portion of the downlink transmission received on the resources allocated to the amplitude modulated PT-RS to represent an equivalent phasor, and use the equivalent phasor to estimate the CPE for the downlink transmission.

[0103] In some aspects, the UE may decode data sent on resources associated with an amplitude modulated PT-RS. For example, the UE may decode the data based at least in part on a configured MCS for the amplitude modulated PT-RS, based at least in part on a configured difference between the MCS for the amplitude modulated PT-RS and an MCS for other data for uplink transmission or downlink transmission, and the like.

[0104] Based at least in part on the UE indicating capability for transmitting using amplitude modulated PT-RS and / or the UE requesting to transmit using amplitude modulated PT-RS, the base station and / or UE can save computing, communication and / or network resources that might otherwise have been used to schedule additional resources to compensate for the use of dedicated resources for PT-RS.

[0105] As noted above, Figure 4 is provided as an example. Other examples may differ from those described above. Figure 4 Examples described.

[0106] Figure 5 is a schematic diagram of an example 500 of an amplitude modulated PT-RS according to the present disclosure.

[0107] As in Figure 5 In the figure and shown by reference numeral 505, the PT-RS can be sent with a constant amplitude using four phase options. The PT-RS with a constant amplitude can carry a Gold sequence based at least in part on the phase of the PT-RS (e.g., using a sequence of four phase options). However, the PT-RS with a constant amplitude may only carry a Gold sequence and may be a dedicated PT-RS that does not carry additional data.

[0108] The PT-RS may be transmitted with variable amplitude using four phase options as shown by reference numeral 510. In this manner, the PT-RS may carry a Gold sequence via the phase of the PT-RS and may carry additional data via the amplitude of the PT-RS.

[0109] In some aspects, the transmitting device (base station 110, UE 120, etc.) can modulate the amplitude of the PT-RS symbol to carry additional data. For example, the transmitting device can configure the PT-RS amplitude using an M-amplitude shift keying (M-ASK) constellation based at least in part on the incoming data bits to be transmitted. The transmitting device can configure the phase of the PT-RS based at least in part on a predefined, known quadrature phase shift keying (QPSK) symbol sequence defined for PT-RS in a communication standard (e.g., based at least in part on the configuration of the network). In some aspects, the PT-RS can be transmitted using an amplitude phase shift keying (APSK) constellation with multiple loops (e.g., representing amplitudes) and four QPSK phase options on each loop.

[0110] A receiving device (e.g., UE 120, base station 110, etc.) may receive and process a PT-RS (e.g., now an amplitude modulated PT-RS). The receiving device may remove a known PT-RS sequence (e.g., by isolating the phase of the PT-RS) and the DMRS may be used to estimate and / or correct the channel impact for each PT-RS symbol. The receiving device may aggregate the PT-RS for each symbol to determine an equivalent phasor. Each phasor may represent a CPE per symbol based at least in part on, for example, phase noise. The phasor may be used to refine the common channel phase estimate per symbol. The receiving device may use antenna combining and signal equalization to determine the combined and equalized signal amplitude. The receiving device may use the combined and equalized signal amplitude to perform soft metric extraction to extract the amplitude modulated on the amplitude of the PT-RS.

[0111] In this way, the determination of the equivalent phasor and / or CPE can be determined without or with an insignificant negative impact from the amplitude modulation applied to the PT-RS (e.g., based at least in part on the equivalent phasor on each symbol having an average amplitude defined by the average amplitude of the amplitude modulated PT-RS).

[0112] As noted above, Figure 5 is provided as an example. Other examples may differ from those described above. Figure 5 Examples described.

[0113] Figure 6 is a schematic diagram illustrating an example 600 of configuring transmission of an amplitude modulated PT-RS according to the present disclosure.

[0114] As in Figure 6In and as shown by reference numeral 605, a transmitting device (e.g., a base station 110, a UE 120, etc.) may receive a first data bit for transmission to a receiving device (e.g., a UE 120, a base station 110, etc.) using an amplitude modulated PT-RS on a first layer on a resource set. The transmitting device may encode and interleave the first data bit based at least in part on an MCS for the PT-RS for transmission via resources (time symbol l and frequency k) allocated to the PT-RS. The transmitting device may perform M-ASK mapping to map the data bit to the amplitude of the PT-RS (e.g., for transmission as a signal with a constant phase (e.g., a phase of zero)). The transmitting device may perform phase mapping to apply a known pilot phase defined by a PT-RS sequence (e.g., as indicated in a communication standard) to the signal.

[0115] As shown by reference numeral 610, the transmitting device may receive a second data bit for transmission to a receiving device (e.g., UE 120, base station 110, etc.) on a second layer using the resource set (e.g., the same resource set on which the amplitude modulated PT-RS is carried on the first layer). The transmitting device may encode and interleave the second data bit based at least in part on the MCS for the data resource for transmission via the resources (time symbol l and frequency k) allocated to the PT-RS. In some aspects (e.g., where the first and second layers use a single codeword), the transmitting device may encode the first bit and the second bit using a single and / or joint encoder. The transmitting device may perform quadrature amplitude modulation (QAM) modulation on the encoded and interleaved second data bits.

[0116] The transmitting device may precode the first data bit and the second data bit. For example, the UE may apply a precoding matrix (e.g., a 2 by 2 precoding matrix). The precoding matrix may be the same precoding matrix used to precode data (e.g., PDSCH data or PUSCH data) to be transmitted using the first bit and the second bit.

[0117] The transmitting device may perform OFDM mapping on the first data bit and data stream A (e.g., data to be sent on the additional resources of the first layer). The transmitting device may also perform OFDM modulation on the first data bit and data stream A after OFDM mapping. Similarly, the transmitting device may perform OFDM mapping on the second data bit and data stream B (e.g., data to be sent on the additional resources of the second layer). The transmitting device may also perform OFDM modulation on the second data bit and data stream B after OFDM mapping.

[0118] The transmitting device may transmit a first bit, data stream A, a second bit, and data stream B to be transmitted (eg, via an antenna, a transmit chain, etc.) to a receiving device.

[0119] As noted above, Figure 6 is provided as an example. Other examples may differ from those described above. Figure 6 Examples described.

[0120] Figure 7 is a diagram illustrating an example 700 of receiving a transmission having an amplitude modulated PT-RS in accordance with the present disclosure.

[0121] As in Figure 7 , and as shown by reference numeral 705, a receiving device may receive a single signal from a transmitting device. The receiving device may perform OFDM demodulation to demodulate the signal based at least in part on, for example, an MCS for a PT-RS and / or an MCS for additional data on a first layer and a second layer. The receiving device may perform OFDM demapping to demap the signal and separate the signal sent via the PT-RS symbol from the data sent via the symbol of the additional data on the first layer and / or the second layer. The additional data (data stream) may be used to determine a DMRS-based channel estimate. The receiving device may perform MMSE equalization using the DMRS-based channel estimate.

[0122] As shown by reference numeral 710, the receiving device may separate the PT-RS from additional data sent on the first layer and / or the second layer (e.g., on the same resource set). The receiving device may perform PT-RS processing and amplitude demodulation on the signal received via the PT-RS resource. The receiving device may perform demodulation on the signal received via the second stream using the same resource set as the PT-RS on the first stream. In some aspects, the receiving device may perform amplitude data processing and / or deinterleaving and decoding on the signal received on the first stream via the PT-RS resource, and may perform PT-RS-based CPE estimation (e.g., in parallel). This may not increase the latency of PDSCH processing. In some aspects, the receiving device may also process (e.g., demodulate, deinterleave and / or decode) the signal received via the second stream using the same resource set (e.g., in parallel).

[0123] The receiving device may determine a phasor for each time symbol (e.g., and for each antenna within a time symbol) based at least in part on the PT-RS processing. The phasor may be used to determine a channel phase error. The receiving device may use the phasor to determine the channel phase error to refine a channel estimate (e.g., a DMRS-based channel estimate) for decoding a signal received via a second stream using the same set of resources as the PT-RS on the first stream.

[0124] The receiving device may use the data bits (e.g., for an application of the receiver to generate another data packet for forwarding, etc.). The receiving device may perform a CRC check on the signal received via the first stream and the signal received via the second stream, and may also provide ACK / NACK signaling for the signal received via the first stream and for the signal received via the second stream.

[0125] As noted above, Figure 7 is provided as an example. Other examples may differ from those described above. Figure 7 Examples described.

[0126] Figure 8 is a diagram of an example 800 of processing and performing amplitude demodulation for an amplitude modulated PT-RS according to the present disclosure.

[0127] As in Figure 8 In and as shown by reference numeral 805, the receiving device may perform phase sequence removal on the estimated symbols and / or resources of the first layer (e.g., associated with the amplitude modulated PT-RS) after performing MMSE. The receiving device may perform channel removal (e.g., channel correction) on the PT-RS signal based at least in part on: channel estimation coefficients based on the DMRS. The receiving device may perform averaging of the PT-RS signals for one or more (e.g., all) PT-RS resources per symbol (e.g., after channel correction has been applied). The receiving device may average the aggregated PT-RS signals over multiple symbols to determine one or more equivalent phasors for the PT-RS symbols in the multiple symbols.

[0128] In this manner, the receiving device can estimate phase noise, residual frequency offset, etc. based at least in part on the amplitude modulated PT-RS. The receiving device can use the estimated phase difference to determine phase noise and / or resolve residual frequency offset (e.g., between symbols) before demodulating and / or decoding additional data sent with the amplitude modulated PT-RS.

[0129] As indicated by reference numeral 810, the receiving device may perform amplitude demodulation on the estimated symbols and / or resources of the first layer (e.g., associated with an amplitude modulated PT-RS) after performing MMSE. The receiving device may remove the known phase sequence from the amplitude modulated PT-RS signal. This may isolate the amplitude component of the PT-RS signal. The receiving device may perform equalization and maximum ratio combining (MRC) based at least in part on: channel estimation coefficients based on the DMRS. The receiving device may determine the amplitude of the PT-RS signal (e.g., based at least in part on the amplitude of the signal). The receiving device may perform a log-likelihood ratio (LLR) calculation to determine the value of the amplitude of the PT-RS signal to deinterleave and decode signals received via the estimated symbols and / or resources associated with the amplitude modulated PT-RS.

[0130] As noted above, Figure 8 is provided as an example. Other examples may differ from those described above. Figure 8 Examples described.

[0131] Fig. 9 9 is a diagram illustrating an example process 900 performed, for example, by a UE in accordance with the present disclosure. Example process 900 is an example of a UE (eg, UE 120, etc.) performing operations associated with amplitude modulated PT-RS for a multi-layer communication link.

[0132] like Fig. 9 As shown in , in some aspects, process 900 may include: sending an indication of the UE's ability to transmit one or more of an uplink transmission or a downlink transmission with an amplitude modulated PT-RS on at least a first layer of a multi-layer communication link including the first layer and the second layer (block 910). For example, the UE (e.g., using the transmit processor 264, the controller / processor 280, the memory 282, etc.) may send an indication of the UE's ability to transmit one or more of an uplink transmission or a downlink transmission with an amplitude modulated PT-RS on at least a first layer of a multi-layer communication link including the first layer and the second layer, as described above.

[0133] As in Fig. 9 As further shown in FIG. 9 , in some aspects, process 900 may include transmitting an uplink transmission or a downlink transmission based at least in part on the indication (block 920). For example, the UE (e.g., using receive processor 258, transmit processor 264, controller / processor 280, memory 282, etc.) may transmit an uplink transmission or a downlink transmission based at least in part on the indication, as described above.

[0134] Process 900 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.

[0135] In a first aspect, an amplitude-modulated PT-RS includes a PT-RS sequence indicated by a phase of the amplitude-modulated PT-RS and data indicated by an amplitude of the amplitude-modulated PT-RS.

[0136] In a second aspect, alone or in combination with the first aspect, transmitting an uplink transmission or a downlink transmission includes receiving a downlink transmission having an amplitude modulated PT-RS on a resource set on a first layer or sending an uplink transmission having an amplitude modulated PT-RS on a resource set on a first layer, and receiving a downlink transmission or sending an uplink transmission includes receiving a downlink transmission having an amplitude modulated PT-RS on the resource set on a second layer or sending an uplink transmission having an amplitude modulated PT-RS on the resource set on a second layer, or receiving a downlink transmission having data on the resource set on the second layer or sending an uplink transmission having data on the resource set on the second layer.

[0137] In a third aspect, alone or in combination with one or more of the first and second aspects, transmitting a downlink transmission includes receiving a downlink transmission, and receiving the downlink transmission includes: performing MMSE equalization on the downlink transmission to produce a first stream associated with a first layer and a second stream associated with a second layer; aggregating signals received via resources allocated for an amplitude-modulated PT-RS for symbols having at least one resource allocated for an amplitude-modulated PT-RS; generating complex coefficients for corresponding symbols having at least one resource allocated for an amplitude-modulated PT-RS based at least in part on the aggregated signals received via resources allocated for an amplitude-modulated PT-RS; and determining a common phase error for corresponding symbols having at least one resource allocated for an amplitude-modulated PT-RS based at least in part on the complex coefficients.

[0138] In a fourth aspect, alone or in combination with one or more of the first to third aspects, process 900 includes determining a common channel phase estimate for a first stream and a second stream based at least in part on a common phase error.

[0139] In a fifth aspect, either alone or in combination with one or more of the first to fourth aspects, transmitting an uplink transmission or a downlink transmission includes sending an uplink transmission, and sending the uplink transmission includes: applying an amplitude to a signal to be sent via a first layer based at least in part on data to be sent on a resource set allocated for an amplitude-modulated PT-RS; and applying a phase to a signal to be sent via the first layer based at least in part on a known PT-RS sequence to be sent on a resource set allocated for an amplitude-modulated PT-RS.

[0140] In a sixth aspect, alone or in combination with one or more of the first to fifth aspects, the first layer is associated with a first DMRS port having a signal strength higher than a signal strength of a DMRS port associated with the second layer.

[0141] In the seventh aspect, alone or in combination with one or more of the first to sixth aspects, transmitting an uplink transmission or a downlink transmission includes: sending an uplink transmission or receiving a downlink transmission based at least in part on a first codeword for data carried on a first layer via a resource set allocated for an amplitude-modulated PT-RS and a second codeword for data carried on a second layer via the resource set, the second codeword being different from the first codeword.

[0142] In an eighth aspect, alone or in combination with one or more of the first to seventh aspects, the second codeword is the same codeword used for data carried on the second layer via the additional set of resources allocated for data.

[0143] In a ninth aspect, either alone or in combination with one or more of the first to eighth aspects, data sent on resources associated with an amplitude modulated PT-RS has a CRC that is different from one or more CRCs associated with other data of an uplink transmission or a downlink transmission.

[0144] In the tenth aspect, alone or in combination with one or more of the first to ninth aspects, data sent on resources associated with an amplitude modulated PT-RS is associated with a dedicated acknowledgement / negative acknowledgement (ACK / NACK) bit that is different from one or more ACK / NACK bits associated with other data transmitted via an uplink transmission or a downlink transmission.

[0145] In an eleventh aspect, alone or in combination with one or more of the first to tenth aspects, process 900 includes: reporting a NACK for an amplitude modulated PT-RS; and receiving a repetition of the amplitude modulated PT-RS via a subsequent PT-RS resource.

[0146] In a twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, the process 900 includes sending a request for an MCS for symbols associated with an amplitude modulated PT-RS.

[0147] In a thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, sending a request for an MCS comprises sending the request for an MCS together with a request for an amplitude modulated PT-RS.

[0148] In a fourteenth aspect, alone or in combination with one or more of the first to thirteenth aspects, the process 900 includes receiving an indication of an MCS for symbols associated with an amplitude modulated PT-RS.

[0149] In a fifteenth aspect, alone or in combination with one or more of the first to fourteenth aspects, the indication of the MCS is based at least in part on feedback signaling associated with a previous downlink transmission with an amplitude modulated PT-RS.

[0150] In the sixteenth aspect, alone or in combination with one or more of the first to fifteenth aspects, receiving an indication of the MCS includes: receiving an indication of the MCS via DCI, RRC signaling, or one or more MAC CEs.

[0151] In the seventeenth aspect, alone or in combination with one or more of the first to sixteenth aspects, the indication of the MCS is used to indicate the difference between the MCS used for symbols associated with the amplitude modulated PT-RS and the MCS used for symbols associated with other data for uplink transmission or downlink transmission.

[0152] In the eighteenth aspect, alone or in combination with one or more of the first to seventeenth aspects, process 900 includes: decoding data multiplexed with a PT-RS sequence on resources associated with an amplitude modulated PT-RS based at least in part on the configured MCS of the amplitude modulated PT-RS for downlink transmission, or the configured difference between the MCS for the amplitude modulated PT-RS and the MCS of other data for downlink transmission.

[0153] In the nineteenth aspect, alone or in combination with one or more of the first to eighteenth aspects, sending an indication of the UE's capabilities includes performing one or more of the following operations: sending the indication via one or more of RRC signaling, MAC CE, or PUCCH messages; or sending a request for an amplitude modulated PT-RS for an uplink transmission or a downlink transmission.

[0154] In the twentieth aspect, either alone or in combination with one or more of aspects one to nineteen, process 900 includes transmitting an uplink transmission or a downlink transmission based at least in part on an assumption that the uplink transmission or the downlink transmission will be transmitted using an amplitude modulated PT-RS based at least in part on a transmission request.

[0155] In a twenty-first aspect, alone or in combination with one or more of the first to twentieth aspects, the process 900 includes receiving configuration information indicating that a base station will provide an indication of whether amplitude modulated PT-RS is enabled.

[0156] In a twenty-second aspect, alone or in combination with one or more of the first to twenty-first aspects, process 900 includes receiving an indication to transmit based at least in part on an amplitude modulated PT-RS.

[0157] In the twenty-third aspect, either alone or in combination with one or more of the first to twenty-second aspects, receiving the indication includes receiving the indication via one or more of a DCI message, a MAC CE, or an RRC signaling.

[0158] In aspect twenty-four, either alone or in combination with one or more of aspects one to twenty-third, process 900 includes receiving a downlink transmission; determining that the downlink transmission has an amplitude modulated PT-RS based at least in part on amplitude variations of resources associated with the PT-RS of the downlink transmission; estimating a common phase error for the downlink transmission based at least in part on the amplitude modulated PT-RS; and attempting to extract data from the amplitude modulated PT-RS.

[0159] Although Fig. 9 Example blocks of process 900 are shown, but in some aspects process 900 may include Fig. 9 The blocks depicted in the process 900 may include additional blocks, fewer blocks, different blocks, or blocks arranged in a different manner than those depicted in the process 900. Additionally or alternatively, two or more blocks in the blocks of process 900 may be executed in parallel.

[0160] Fig.10 1 is a diagram illustrating an example process 1000 performed, for example, by a base station in accordance with the present disclosure. Example process 1000 is an example of a base station (eg, base station 110, etc.) performing operations associated with amplitude modulated PT-RS for a multi-layer communication link.

[0161] like Fig.10As shown in , in some aspects, process 1000 may include: receiving an indication of the ability of the UE to transmit one or more of an uplink transmission or a downlink transmission with an amplitude modulated PT-RS on at least a first layer of a multi-layer communication link including the first layer and the second layer (block 1010). For example, a base station (e.g., using receive processor 238, controller / processor 240, memory 242, etc.) may receive an indication of the ability of the UE to transmit one or more of an uplink transmission or a downlink transmission with an amplitude modulated PT-RS on at least a first layer of a multi-layer communication link including the first layer and the second layer, as described above.

[0162] As in Fig.10 As further shown in FIG. 1 , in some aspects, process 1000 may include transmitting an uplink transmission or a downlink transmission based at least in part on the indication (block 1020). For example, as described above, the base station (e.g., using transmit processor 220, receive processor 238, controller / processor 240, memory 242, etc.) may transmit an uplink transmission or a downlink transmission based at least in part on the indication.

[0163] Process 1000 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.

[0164] In a first aspect, process 1000 includes determining whether to send a downlink transmission with an amplitude modulated PT-RS or whether to indicate to a UE to send an uplink transmission based at least in part on one or more of the following: an amount of data buffered for a downlink transmission or an uplink transmission, a size of a resource grant associated with the downlink transmission or the uplink transmission, a reference signal received power associated with the UE, or movement of the UE.

[0165] In a second aspect, alone or in combination with the first aspect, the amplitude modulated PT-RS includes a PT-RS sequence indicated by a phase of the amplitude modulated PT-RS and data indicated by an amplitude of the amplitude modulated PT-RS.

[0166] In a third aspect, alone or in combination with one or more of the first and second aspects, transmitting an uplink transmission or a downlink transmission includes sending a downlink transmission having an amplitude modulated PT-RS on a resource set on a first layer or receiving an uplink transmission having an amplitude modulated PT-RS on a resource set on a first layer, and sending a downlink transmission or receiving an uplink transmission includes sending a downlink transmission having an amplitude modulated PT-RS on the resource set on a second layer or receiving an uplink transmission having an amplitude modulated PT-RS on the resource set on a second layer, or sending a downlink transmission having data on the resource set on the second layer or receiving an uplink transmission having data on the resource set on the second layer.

[0167] In a fourth aspect, alone or in combination with one or more of the first to third aspects, transmitting a downlink transmission includes receiving an uplink transmission, and receiving the uplink transmission includes: performing MMSE equalization on the uplink transmission to generate a first stream associated with a first layer and a second stream associated with a second layer; aggregating signals received via resources allocated for an amplitude-modulated PT-RS for symbols having at least one resource allocated for an amplitude-modulated PT-RS; generating complex coefficients for corresponding symbols having at least one resource allocated for an amplitude-modulated PT-RS based at least in part on the aggregated signals received via resources allocated for an amplitude-modulated PT-RS; and determining a common phase error for corresponding symbols having at least one resource allocated for an amplitude-modulated PT-RS based at least in part on the complex coefficients.

[0168] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, process 1000 includes determining a common channel phase estimate for a first stream and a second stream based at least in part on a common phase error.

[0169] In the sixth aspect, alone or in combination with one or more of the first to fifth aspects, transmitting an uplink transmission or a downlink transmission includes sending a downlink transmission, and sending the downlink transmission includes: applying an amplitude to a signal to be sent via the first layer based at least in part on data to be sent on a resource set allocated for an amplitude-modulated PT-RS; and applying a phase to a signal to be sent via the first layer based at least in part on a known PT-RS sequence to be sent on a resource set allocated for an amplitude-modulated PT-RS.

[0170] In a seventh aspect, alone or in combination with one or more of the first to sixth aspects, the first layer is associated with a first DMRS port having a signal strength higher than a signal strength of a DMRS port associated with the second layer.

[0171] In the eighth aspect, alone or in combination with one or more of the first to seventh aspects, transmitting an uplink transmission or a downlink transmission includes: sending a downlink transmission or receiving an uplink transmission based at least in part on a first codeword for data carried on a first layer via a resource set allocated for an amplitude-modulated PT-RS and a second codeword for data carried on a second layer via the resource set, the second codeword being different from the first codeword.

[0172] In a ninth aspect, alone or in combination with one or more of the first to eighth aspects, the second codeword is the same codeword used for data carried on the second layer via the additional set of resources allocated for data.

[0173] In a tenth aspect, either alone or in combination with one or more of the first to ninth aspects, data sent on resources associated with an amplitude modulated PT-RS has a CRC that is different from one or more CRCs associated with other data of an uplink transmission or a downlink transmission.

[0174] In the eleventh aspect, alone or in combination with one or more of the first to tenth aspects, data sent on resources associated with an amplitude modulated PT-RS is associated with a dedicated ACK / NACK bit that is different from one or more ACK / NACK bits associated with other data transmitted via an uplink transmission or a downlink transmission.

[0175] In a twelfth aspect, alone or in combination with one or more of the first to eleventh aspects, the process 1000 includes: receiving a NACK for an amplitude modulated PT-RS; and sending a repetition of the amplitude modulated PT-RS via a subsequent PT-RS resource.

[0176] In a thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, the process 1000 includes receiving a request for an MCS for symbols associated with an amplitude modulated PT-RS.

[0177] In a fourteenth aspect, alone or in combination with one or more of the first to thirteenth aspects, receiving the request for the MCS includes receiving the request for the MCS together with a request for an amplitude modulated PT-RS.

[0178] In a fifteenth aspect, alone or in combination with one or more of the first to fourteenth aspects, the process 1000 includes sending an indication of an MCS for symbols associated with an amplitude modulated PT-RS.

[0179] In a sixteenth aspect, alone or in combination with one or more of the first to fifteenth aspects, the indication of the MCS is based at least in part on feedback signaling associated with a previous uplink transmission with an amplitude modulated PT-RS.

[0180] In the seventeenth aspect, alone or in combination with one or more of the first to sixteenth aspects, sending an indication of the MCS includes: receiving an indication of the MCS via DCI, RRC signaling, or one or more MAC CEs.

[0181] In the eighteenth aspect, alone or in combination with one or more of the first to seventeenth aspects, the indication of the MCS is used to indicate the difference between the MCS used for symbols associated with the amplitude modulated PT-RS and the MCS used for symbols associated with other data for uplink transmission or downlink transmission.

[0182] In the nineteenth aspect, alone or in combination with one or more of the first to eighteenth aspects, process 1000 includes: decoding data multiplexed with a PT-RS sequence on resources associated with an amplitude modulated PT-RS based at least in part on the configured MCS of the amplitude modulated PT-RS for uplink transmission, or the configured difference between the MCS for the amplitude modulated PT-RS and the MCS of other data for uplink transmission.

[0183] In the twentieth aspect, either alone or in combination with one or more of aspects one to nineteen, receiving an indication of the capabilities of the UE comprises performing one or more of: receiving the indication via one or more of RRC signaling, MAC CE, or PUCCH messages; or receiving a request for an amplitude modulated PT-RS for an uplink transmission or a downlink transmission.

[0184] In aspect twenty-one, either alone or in combination with one or more of aspects one to twentieth, process 1000 comprises transmitting an uplink transmission or a downlink transmission based at least in part on an assumption that the uplink transmission or the downlink transmission will be transmitted using an amplitude modulated PT-RS based at least in part on a received request.

[0185] In a twenty-second aspect, alone or in combination with one or more of the first to twenty-first aspects, the process 1000 includes sending configuration information indicating that the base station will provide an indication of whether to enable amplitude modulated PT-RS.

[0186] In a twenty-third aspect, alone or in combination with one or more of the first to twenty-second aspects, the process 1000 includes sending an indication for transmitting based at least in part on an amplitude modulated PT-RS.

[0187] In the twenty-fourth aspect, alone or in combination with one or more of the first to twenty-third aspects, sending the indication includes: sending the indication via one or more of a DCI message, a MAC CE or an RRC signaling.

[0188] In aspect twenty-fifth, alone or in combination with one or more of aspects one to twenty-fourth, process 1000 includes: receiving an uplink transmission; determining that the uplink transmission has an amplitude modulated PT-RS based at least in part on amplitude variations of resources associated with the PT-RS of the uplink transmission; estimating a common phase error for the uplink transmission based at least in part on the amplitude modulated PT-RS; and attempting to extract data from the amplitude modulated PT-RS.

[0189] Although Fig.10 Example blocks of process 1000 are shown, but in some aspects process 1000 may include Fig.10 The blocks in process 1000 may include additional blocks, fewer blocks, different blocks, or blocks arranged in a different manner than those depicted in process 1000. Additionally or alternatively, two or more blocks in the blocks of process 1000 may be executed in parallel.

[0190] The following provides an overview of some aspects of the disclosure:

[0191] Aspect 1: A method of wireless communication performed by a user equipment (UE), comprising: sending an indication of the UE's ability to transmit one or more of an uplink transmission or a downlink transmission having an amplitude modulated phase tracking reference signal (PT-RS) on at least a first layer of a multi-layer communication link having a first layer and a second layer; and transmitting an uplink transmission or a downlink transmission based at least in part on the indication.

[0192] Aspect 2: The method according to Aspect 1, wherein the amplitude-modulated PT-RS includes: a PT-RS sequence indicated by a phase of the amplitude-modulated PT-RS; and data indicated by an amplitude of the amplitude-modulated PT-RS.

[0193] Aspect 3: A method according to any one of Aspects 1-2, wherein transmitting the uplink transmission or the downlink transmission includes: receiving the downlink transmission having an amplitude-modulated PT-RS on a resource set on the first layer or sending an uplink transmission having an amplitude-modulated PT-RS on a resource set on the first layer, and wherein receiving the downlink transmission or sending the uplink transmission includes: receiving the downlink transmission having an amplitude-modulated PT-RS on the resource set on the second layer or sending the uplink transmission having an amplitude-modulated PT-RS on the resource set on the second layer, or receiving the downlink transmission having data on the resource set on the second layer or sending the uplink transmission having data on the resource set on the second layer.

[0194] Aspect 4: A method according to any one of Aspects 1-3, wherein transmitting the downlink transmission includes: receiving the downlink transmission, and wherein receiving the downlink transmission includes: performing minimum mean square error equalization on the downlink transmission to generate a first stream associated with the first layer and a second stream associated with the second layer; aggregating signals received via resources allocated for amplitude-modulated PT-RS for symbols having at least one resource allocated for amplitude-modulated PT-RS; generating complex coefficients for corresponding symbols having at least one resource allocated for amplitude-modulated PT-RS based at least in part on the aggregated signals received via the resources allocated for amplitude-modulated PT-RS; and determining a common phase error for corresponding symbols having at least one resource allocated for amplitude-modulated PT-RS based at least in part on the complex coefficients.

[0195] Aspect 5: The method according to aspect 4 further comprises: determining a common channel phase estimation correction coefficient for the first stream and the second stream based at least in part on the common phase error.

[0196] Aspect 6: A method according to any one of Aspects 1-5, wherein transmitting the uplink transmission or the downlink transmission includes sending the uplink transmission, and wherein sending the uplink transmission includes: applying an amplitude to a signal to be sent via the first layer based at least in part on data to be sent on a resource set allocated for the amplitude-modulated PT-RS; and applying a phase to the signal to be sent via the first layer based at least in part on a known PT-RS sequence to be sent on the resource set allocated for the amplitude-modulated PT-RS.

[0197] Aspect 7: A method according to any one of Aspects 1-6, wherein the first layer is associated with a first demodulation reference signal (DMRS) port, and the first DMRS port has a signal strength higher than a signal strength of a DMRS port associated with the second layer.

[0198] Aspect 8: A method according to any one of Aspects 1-7, wherein transmitting the uplink transmission or the downlink transmission includes: sending the uplink transmission or receiving the downlink transmission based at least in part on: a first codeword for data carried on the first layer via a resource set allocated for an amplitude-modulated PT-RS, and a second codeword for data carried on the second layer via the resource set, the second codeword being different from the first codeword.

[0199] Aspect 9: The method according to aspect 8, wherein the second codeword is the same codeword used for data carried on the second layer via the additional set of resources allocated for data.

[0200] Aspect 10: A method according to any one of Aspects 1-9, wherein the data sent on the resources associated with the amplitude modulated PT-RS has a CRC that is different from one or more cyclic redundancy checks (CRCs) associated with other data of the uplink transmission or the downlink transmission.

[0201] Aspect 11: A method according to any one of Aspects 1-10, wherein the data sent on the resources associated with the amplitude-modulated PT-RS is associated with a dedicated acknowledgment / negative acknowledgment (ACK / NACK) bit, and the dedicated ACK / NACK bit is different from one or more ACK / NACK bits associated with other data transmitted via the uplink transmission or the downlink transmission.

[0202] Aspect 12: The method according to aspect 11 further includes: reporting a NACK for the amplitude-modulated PT-RS; and receiving a repetition of the amplitude-modulated PT-RS via a subsequent PT-RS resource.

[0203] Aspect 13: The method according to any one of aspects 1-12, further comprising: sending a request for a modulation and coding scheme for symbols associated with the amplitude modulated PT-RS.

[0204] Aspect 14: The method according to aspect 13, wherein sending the request for the modulation and coding scheme includes: sending the request for the modulation and coding scheme together with a request for an amplitude modulated PT-RS.

[0205] Aspect 15: The method according to any one of aspects 1-14, further comprising: receiving an indication of a modulation and coding scheme for symbols associated with the amplitude modulated PT-RS.

[0206] Aspect 16: The method of aspect 15, wherein the indication of the modulation and coding scheme is based at least in part on feedback signaling associated with a previous downlink transmission with an amplitude modulated PT-RS.

[0207] Aspect 17: A method according to any one of Aspects 15-16, wherein receiving the indication of the modulation and coding scheme includes: receiving the indication of the modulation and coding scheme via downlink control information, radio resource control signaling, or one or more medium access control control elements.

[0208] Aspect 18: A method according to any one of Aspects 15-17, wherein the indication of the modulation and coding scheme is used to indicate the difference between the modulation and coding scheme used for symbols associated with the amplitude modulated PT-RS and the modulation and coding scheme used for symbols associated with other data of the uplink transmission or the downlink transmission.

[0209] Aspect 19: The method according to any one of Aspects 1-18 further includes: decoding data multiplexed with the PT-RS sequence on resources associated with the amplitude modulated PT-RS based at least in part on: a configured modulation and coding scheme for the amplitude modulated PT-RS for downlink transmission, or a configured difference between the modulation and coding scheme for the amplitude modulated PT-RS and the modulation and coding scheme for other data for downlink transmission.

[0210] Aspect 20: A method according to any one of Aspects 1-19, wherein sending the indication of the capability of the UE includes one or more of the following operations: sending the indication via one or more of radio resource control signaling, medium access control control elements, or physical uplink control channel messages, or sending a request for an amplitude modulated PT-RS for uplink transmission or downlink transmission.

[0211] Aspect 21: The method according to Aspect 20 also includes: transmitting the uplink transmission or the downlink transmission based at least in part on the following assumption: at least in part on sending the request to assume that the uplink transmission or the downlink transmission will be sent using an amplitude modulated PT-RS.

[0212] Aspect 22: The method according to any one of aspects 1-21 further includes: receiving configuration information indicating that the base station will provide an indication of whether to enable amplitude modulated PT-RS.

[0213] Aspect 23: The method according to any one of aspects 1-22, further comprising: receiving an indication to transmit based at least in part on the amplitude modulated PT-RS.

[0214] Aspect 24: The method according to aspect 23, wherein receiving the indication comprises: receiving the indication via one or more of the following: a downlink control information message, a medium access control control element, or a radio resource control signaling.

[0215] Aspect 25: The method according to any one of Aspects 1-24 also includes: receiving the downlink transmission; determining that the downlink transmission has an amplitude-modulated PT-RS based at least in part on an amplitude change of resources associated with the PT-RS of the downlink transmission; estimating a common phase error for the downlink transmission based at least in part on the amplitude-modulated PT-RS; and attempting to extract data from the amplitude-modulated PT-RS.

[0216] Aspect 26: A method of wireless communication performed by a base station, comprising: receiving an indication of a user equipment (UE)'s ability to transmit one or more of an uplink transmission or a downlink transmission having an amplitude modulated phase tracking reference signal (PT-RS) on at least a first layer of a multi-layer communication link including a first layer and a second layer; and transmitting an uplink transmission or a downlink transmission based at least in part on the indication.

[0217] Aspect 27: The method according to Aspect 26 also includes: determining whether to send the downlink transmission with the amplitude modulated PT-RS or whether to instruct the UE to send an uplink transmission based at least in part on one or more of the following items: the amount of data buffered for the downlink transmission or the uplink transmission, the size of the resource grant associated with the downlink transmission or the uplink transmission, the reference signal received power associated with the UE, or the movement of the UE.

[0218] Aspect 28: A method according to any one of Aspects 26-27, wherein the amplitude-modulated PT-RS comprises: a PT-RS sequence indicated by a phase of the amplitude-modulated PT-RS; and data indicated by an amplitude of the amplitude-modulated PT-RS.

[0219] Aspect 29: A method according to any one of Aspects 26-28, wherein transmitting the uplink transmission or the downlink transmission includes sending the downlink transmission having an amplitude-modulated PT-RS on a resource set on the first layer or receiving the uplink transmission having an amplitude-modulated PT-RS on a resource set on the first layer, and wherein sending the downlink transmission or receiving the uplink transmission includes: sending the downlink transmission having an amplitude-modulated PT-RS on the resource set on the second layer or receiving the uplink transmission having an amplitude-modulated PT-RS on the resource set on the second layer, or sending the downlink transmission having data on the resource set on the second layer or receiving the uplink transmission having data on the resource set on the second layer.

[0220] Aspect 30: A method according to any one of Aspects 26-29, wherein transmitting the downlink transmission includes receiving the uplink transmission, and wherein receiving the uplink transmission includes: performing minimum mean square error equalization on the uplink transmission to produce a first stream associated with the first layer and a second stream associated with the second layer; aggregating signals received via resources allocated for amplitude-modulated PT-RS for symbols having at least one resource allocated for amplitude-modulated PT-RS; generating complex coefficients for corresponding symbols having at least one resource allocated for amplitude-modulated PT-RS based at least in part on the aggregated signals received via the resources allocated for amplitude-modulated PT-RS; and determining a common phase error for corresponding symbols having at least one resource allocated for amplitude-modulated PT-RS based at least in part on the complex coefficients.

[0221] Aspect 31: The method according to aspect 30 further comprises: determining a common channel phase estimate for the first stream and the second stream based at least in part on the common phase error.

[0222] Aspect 32: A method according to any one of Aspects 26-31, wherein transmitting the uplink transmission or the downlink transmission includes sending the downlink transmission, and wherein sending the downlink transmission includes: applying an amplitude to a signal to be sent via the first layer based at least in part on data to be sent on a resource set allocated for the amplitude-modulated PT-RS; and applying a phase to the signal to be sent via the first layer based at least in part on a known PT-RS sequence to be sent on the resource set allocated for the amplitude-modulated PT-RS.

[0223] Aspect 33: A method according to any one of Aspects 26-32, wherein the first layer is associated with a first demodulation reference signal (DMRS) port, and the first DMRS port has a signal strength higher than a signal strength of a DMRS port associated with the second layer.

[0224] Aspect 34: A method according to any one of Aspects 26-33, wherein transmitting the uplink transmission or the downlink transmission includes: sending the downlink transmission or receiving the uplink transmission based at least in part on: a first codeword for data carried on the first layer via a resource set allocated for an amplitude-modulated PT-RS, and a second codeword for data carried on the second layer via the resource set, the second codeword being different from the first codeword.

[0225] Aspect 35: The method according to aspect 34, wherein the second codeword is the same codeword used for data carried on the second layer via the additional set of resources allocated for data.

[0226] Aspect 36: A method according to any one of Aspects 26-35, wherein the data sent on the resources associated with the amplitude modulated PT-RS has a CRC that is different from one or more cyclic redundancy checks (CRCs) associated with other data of the uplink transmission or the downlink transmission.

[0227] Aspect 37: A method according to any one of Aspects 26-36, wherein the data sent on the resources associated with the amplitude-modulated PT-RS is associated with a dedicated acknowledgment / negative acknowledgment (ACK / NACK) bit, and the dedicated ACK / NACK bit is different from one or more ACK / NACK bits associated with other data transmitted via the uplink transmission or the downlink transmission.

[0228] Aspect 38: The method according to aspect 37 further includes: receiving a NACK for the amplitude modulated PT-RS; and sending a repetition of the amplitude modulated PT-RS via a subsequent PT-RS resource.

[0229] Aspect 39: The method according to any one of aspects 26-38, further comprising: receiving a request for a modulation and coding scheme for symbols associated with the amplitude modulated PT-RS.

[0230] Aspect 40: The method according to aspect 39, wherein receiving the request for the modulation and coding scheme includes: receiving the request for the modulation and coding scheme together with a request for an amplitude modulated PT-RS.

[0231] Aspect 41: The method according to any one of aspects 26-40, further comprising: sending an indication of a modulation and coding scheme used for symbols associated with the amplitude modulated PT-RS.

[0232] Aspect 42: The method of aspect 41, wherein the indication of the modulation and coding scheme is based at least in part on feedback signaling associated with a previous uplink transmission with an amplitude modulated PT-RS.

[0233] Aspect 43: A method according to any one of Aspects 41-42, wherein sending the indication of the modulation and coding scheme includes: sending the indication of the modulation and coding scheme via downlink control information, radio resource control signaling, or one or more medium access control control elements.

[0234] Aspect 44: A method according to any one of Aspects 41-43, wherein the indication of the modulation and coding scheme is used to indicate the difference between the modulation and coding scheme used for symbols associated with the amplitude modulated PT-RS and the modulation and coding scheme used for symbols associated with other data of the uplink transmission or the downlink transmission.

[0235] Aspect 45: The method according to any one of Aspects 26-44 further includes: decoding data multiplexed with the PT-RS sequence on resources associated with the amplitude modulated PT-RS based at least in part on: a configured modulation and coding scheme for the amplitude modulated PT-RS for uplink transmission, or a configured difference between the modulation and coding scheme for the amplitude modulated PT-RS and the modulation and coding scheme for other data for uplink transmission.

[0236] Aspect 46: A method according to any one of Aspects 26-45, wherein receiving the indication of the capability of the UE includes performing one or more of the following operations: receiving the indication via one or more of radio resource control signaling, medium access control control elements, or physical uplink control channel messages; or receiving a request for an amplitude modulated PT-RS for an uplink transmission or a downlink transmission.

[0237] Aspect 47: The method according to Aspect 46 also includes: transmitting the uplink transmission or the downlink transmission based at least in part on the following assumption: assuming at least in part based on receiving the request that the uplink transmission or the downlink transmission will be sent using an amplitude modulated PT-RS.

[0238] Aspect 48: The method according to any one of aspects 26-47 further comprises: sending configuration information indicating that the base station will provide an indication of whether to enable amplitude modulated PT-RS.

[0239] Aspect 49: The method according to any one of aspects 26-48, further comprising: sending an indication for transmitting based at least in part on the amplitude modulated PT-RS.

[0240] Aspect 50: The method according to aspect 49, wherein sending the indication includes: sending the indication via one or more of a downlink control information message, a medium access control control element, or a radio resource control signaling.

[0241] Aspect 51: The method according to any one of Aspects 26-50 further includes: receiving the uplink transmission; determining that the uplink transmission has an amplitude-modulated PT-RS based at least in part on an amplitude change of resources associated with the PT-RS of the uplink transmission; estimating a common phase error for the uplink transmission based at least in part on the amplitude-modulated PT-RS; and attempting to extract data from the amplitude-modulated PT-RS.

[0242] Aspect 52: An apparatus for wireless communication at a device, comprising: a processor; a memory coupled to the processor; and instructions, the instructions being stored in the memory and executable by the processor to cause the apparatus to perform a method according to one or more of Aspects 1-51.

[0243] Aspect 53: An apparatus for wireless communication, comprising a memory and one or more processors coupled to the memory, the memory and the one or more processors being configured to perform the method according to one or more of aspects 1-51.

[0244] Aspect 54: An apparatus for wireless communication, comprising at least one unit for performing the method according to one or more of aspects 1-51.

[0245] Aspect 55: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform the method according to one or more of aspects 1-51.

[0246] Aspect 56: A non-transitory computer-readable medium storing an instruction set for wireless communication, the instruction set comprising one or more instructions, which when executed by one or more processors of a device causes the device to perform a method according to one or more of aspects 1-51.

[0247] 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 are possible in light of the above disclosure or may be acquired from practicing the various aspects.

[0248] As used herein, the term "component" is intended to be broadly interpreted as a combination of hardware and / or hardware and software. Whether referred to as software, firmware, middleware, microcode, hardware description language or other terms, "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, executable files, threads of execution, processes and / or functions and other examples. As used herein, a processor is implemented with a combination of hardware and / or hardware and software. It will be apparent that the system and / or method described herein can be implemented with a combination of hardware and / or hardware and software in different forms. The actual special control hardware or software code for implementing these systems and / or methods is not to limit various aspects. Therefore, the operation and behavior of the system and / or method are described herein without reference to a specific software code, and it is to be understood that software and hardware can be designed to implement the system and / or method based at least in part on the description herein.

[0249] 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.

[0250] Even if the specific combination of features is recorded in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of various aspects. In fact, many features in these features can be combined in a manner that is not specifically recorded in the claims and / or specifically disclosed in the specification. Although each dependent claim listed below can only be directly subordinate to a claim, the disclosure of various aspects includes the combination of each dependent claim and each other claim in the claim set. As used herein, the phrase of "at least one of" referring to the list of items refers to any combination of those items, including single members. For example, "at least one of a, b or c" is intended to cover a, b, c, ab, ac, bc and abc, and any combination of identical elements in multiples (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc and ccc or any other sorting of a, b and c).

[0251] Any element, action or instruction used herein should not be interpreted as critical or necessary, unless clearly described as such. In addition, as used herein, the article "a" and "an" are intended to include one or more projects, and can be used interchangeably with "one or more". In addition, as used herein, the article "the" is intended to include one or more projects quoted in conjunction with the article "the", and can be used interchangeably with "one or more". In addition, as used herein, the term "set" and "group" are intended to include one or more projects (for example, related projects, unrelated projects, or a combination of related projects and unrelated projects), and can be used interchangeably with "one or more". In the case of only expecting a project, the phrase "only one" or similar language is used. In addition, as used herein, the term "has", "have", "having" etc. are intended to be open terms. In addition, unless otherwise clearly stated, the phrase "based on" is intended to mean "at least partially based on". Furthermore, as used herein, the term "or" when used in a series is intended to be inclusive and can be used interchangeably with "and / or" unless expressly stated otherwise (eg, if used in conjunction with "either" or "only one of").

Claims

1. A user equipment (UE) for wireless communication, comprising: one or more memories; as well as One or more processors coupled to the one or more memories, configured to: sending an indication of the UE's ability to transmit an amplitude modulated phase tracking reference signal (PT-RS) on at least the first layer of a multi-layer communication link comprising a first layer and a second layer; as well as Based at least in part on the indication, transmitting an uplink transmission or a downlink transmission on at least the first layer of the multi-layer communication link using the amplitude modulated PT-RS, the amplitude modulated PT-RS comprising: a PT-RS sequence indicated by the phase of the amplitude modulated PT-RS, and At least downlink shared channel data or uplink shared channel data is indicated by the amplitude of the amplitude-modulated PT-RS.

2. The UE according to claim 1, wherein: To transmit the uplink transmission or the downlink transmission, the one or more processors are configured to: receive the downlink transmission having the amplitude modulated PT-RS on a resource set on the first layer or send the uplink transmission having the amplitude modulated PT-RS on a resource set on the first layer, and Wherein, in order to receive the downlink transmission or send the uplink transmission, the one or more processors are configured to: receiving the downlink transmission having an amplitude modulated PT-RS on the set of resources on the second layer or sending the uplink transmission having an amplitude modulated PT-RS on the set of resources on the second layer, or receiving the downlink transmission having at least the downlink shared channel data on the set of resources on the second layer or sending the uplink transmission having at least the uplink shared channel data on the set of resources on the second layer.

3. The UE according to claim 1, wherein: To transmit the downlink transmission, the one or more processors are configured to: receive the downlink transmission, and Wherein, in order to receive the downlink transmission, the one or more processors are configured to: performing minimum mean square error equalization on the downlink transmission to produce a first stream associated with the first layer and a second stream associated with the second layer; aggregating, for a symbol having at least one resource allocated for an amplitude-modulated PT-RS, a signal received via a resource allocated for an amplitude-modulated PT-RS; generating complex coefficients for corresponding symbols having at least one resource allocated for an amplitude modulated PT-RS based at least in part on aggregated signals received via the resources allocated for an amplitude modulated PT-RS; and A common phase error for respective symbols having at least one resource allocated for an amplitude modulated PT-RS is determined based at least in part on the complex coefficients.

4. The UE according to claim 3, wherein: The one or more processors are further configured to: A common channel phase correction coefficient for the first stream and the second stream is determined based at least in part on the common phase error.

5. The UE according to claim 1, wherein: The first layer is associated with a first demodulation reference signal (DMRS) port, the first DMRS port having a signal strength higher than a signal strength of a DMRS port associated with the second layer.

6. The UE according to claim 1, wherein: To transmit the uplink transmission or the downlink transmission, the one or more processors are configured to: The uplink transmission is sent or the downlink transmission is received based at least in part on: a first codeword for data carried on the first layer via a set of resources allocated for an amplitude modulated PT-RS, and A second codeword is used for data carried via the set of resources on the second layer, the second codeword being different from the first codeword.

7. The UE according to claim 1, wherein: Data sent on resources associated with the amplitude modulated PT-RS is associated with dedicated acknowledgement / negative acknowledgement (ACK / NACK) bits that are different from one or more ACK / NACK bits associated with other data transmitted via the uplink transmission or the downlink transmission.

8. The UE according to claim 1, wherein: The one or more processors are further configured to: A request is sent for a modulation and coding scheme for symbols associated with the amplitude modulated PT-RS.

9. The UE according to claim 1, wherein: The one or more processors are further configured to: An indication of a modulation and coding scheme for symbols associated with the amplitude modulated PT-RS is received.

10. The UE according to claim 1, wherein: To send the indication of the capability of the UE, the one or more processors are configured to: The indication is sent via one or more of radio resource control signaling, a medium access control control element, or a physical uplink control channel message, or The request for the amplitude modulated PT-RS is sent for either uplink transmission or downlink transmission.

11. The UE according to claim 1, wherein: The one or more processors are further configured to: Configuration information is received, the configuration information indicating that a base station will provide an indication of whether amplitude modulated PT-RS is enabled.

12. The UE according to claim 1, wherein: The one or more processors are further configured to: Receiving an indication to transmit based at least in part on the amplitude modulated PT-RS via one or more of: Downlink Control Information Message, a media access control element, or Radio Resource Control Signaling.

13. A method of wireless communication performed by a user equipment (UE), comprising: sending an indication of the UE's ability to transmit an amplitude modulated phase tracking reference signal (PT-RS) on at least the first layer of a multi-layer communication link comprising a first layer and a second layer; as well as Based at least in part on the indication, transmitting an uplink transmission or a downlink transmission on at least the first layer of the multi-layer communication link using the amplitude modulated PT-RS, the amplitude modulated PT-RS comprising: a PT-RS sequence indicated by the phase of the amplitude modulated PT-RS, and At least downlink shared channel data or uplink shared channel data is indicated by the amplitude of the amplitude-modulated PT-RS.

14. The method according to claim 13, wherein: Transmitting the uplink transmission or the downlink transmission comprises: receiving the downlink transmission with the amplitude modulated PT-RS on the first layer on a set of resources or sending the uplink transmission with the amplitude modulated PT-RS on the first layer on a set of resources, and The receiving the downlink transmission or sending the uplink transmission comprises: receiving the downlink transmission having an amplitude modulated PT-RS on the set of resources on the second layer or sending the uplink transmission having an amplitude modulated PT-RS on the set of resources on the second layer, or receiving the downlink transmission having at least the downlink shared channel data on the set of resources on the second layer or sending the uplink transmission having at least the uplink shared channel data on the set of resources on the second layer.

15. The method according to claim 13, wherein: Transmitting the downlink transmission comprises: receiving the downlink transmission, and Wherein, receiving the downlink transmission comprises: performing minimum mean square error equalization on the downlink transmission to produce a first stream associated with the first layer and a second stream associated with the second layer; aggregating, for a symbol having at least one resource allocated for an amplitude-modulated PT-RS, a signal received via a resource allocated for an amplitude-modulated PT-RS; generating complex coefficients for corresponding symbols having at least one resource allocated for an amplitude modulated PT-RS based at least in part on aggregated signals received via the resources allocated for an amplitude modulated PT-RS; and A common phase error for respective symbols having at least one resource allocated for an amplitude modulated PT-RS is determined based at least in part on the complex coefficients.

16. The method according to claim 15, further comprising: A common channel phase correction coefficient for the first stream and the second stream is determined based at least in part on the common phase error.

17. The method according to claim 13, wherein: The first layer is associated with a first demodulation reference signal (DMRS) port, the first DMRS port having a signal strength higher than a signal strength of a DMRS port associated with the second layer.

18. The method according to claim 13, wherein: Transmitting the uplink transmission or the downlink transmission comprises: The uplink transmission is sent or the downlink transmission is received based at least in part on: a first codeword for data carried on the first layer via a set of resources allocated for an amplitude modulated PT-RS, and A second codeword is used for data carried via the set of resources on the second layer, the second codeword being different from the first codeword.

19. The method according to claim 13, wherein: Data sent on resources associated with the amplitude modulated PT-RS is associated with dedicated acknowledgement / negative acknowledgement (ACK / NACK) bits that are different from one or more ACK / NACK bits associated with other data transmitted via the uplink transmission or the downlink transmission.

20. The method of claim 13, further comprising: A request is sent for a modulation and coding scheme for symbols associated with the amplitude modulated PT-RS.

21. The method of claim 13, further comprising: An indication of a modulation and coding scheme for symbols associated with the amplitude modulated PT-RS is received.

22. The method according to claim 13, wherein: Sending the indication of the capability of the UE comprises one or more of: The indication is sent via one or more of radio resource control signaling, a medium access control control element, or a physical uplink control channel message, or The request for the amplitude modulated PT-RS is sent for either uplink transmission or downlink transmission.

23. The method of claim 13, further comprising: Configuration information is received, the configuration information indicating that a base station will provide an indication of whether amplitude modulated PT-RS is enabled.

24. The method of claim 13, further comprising: Receiving an indication to transmit based at least in part on the amplitude modulated PT-RS via one or more of: Downlink Control Information Message, a media access control element, or Radio Resource Control Signaling.

25. A non-transitory computer readable medium storing a set of instructions for wireless communication, the set of instructions comprising: One or more instructions, which when executed by one or more processors of a user equipment (UE), cause the UE to perform the following operations: sending an indication of the UE's ability to transmit an amplitude modulated phase tracking reference signal (PT-RS) on at least the first layer of a multi-layer communication link comprising a first layer and a second layer; as well as Based at least in part on the indication, transmitting an uplink transmission or a downlink transmission on at least the first layer of the multi-layer communication link using the amplitude modulated PT-RS, the amplitude modulated PT-RS comprising: a PT-RS sequence indicated by the phase of the amplitude modulated PT-RS, and At least downlink shared channel data or uplink shared channel data is indicated by the amplitude of the amplitude-modulated PT-RS.

26. The non-transitory computer readable medium of claim 25, wherein: To transmit the uplink transmission or the downlink transmission, the one or more instructions, when executed by the one or more processors, cause the UE to receive the downlink transmission with the amplitude modulated PT-RS on a resource set on the first layer or to send the uplink transmission with the amplitude modulated PT-RS on a resource set on the first layer, and Wherein, in order to receive the downlink transmission or send the uplink transmission, the one or more instructions, when executed by the one or more processors, cause the UE to: receiving the downlink transmission having an amplitude modulated PT-RS on the set of resources on the second layer or sending the uplink transmission having an amplitude modulated PT-RS on the set of resources on the second layer, or receiving the downlink transmission having at least the downlink shared channel data on the set of resources on the second layer or sending the uplink transmission having at least the uplink shared channel data on the set of resources on the second layer.

27. The non-transitory computer readable medium of claim 25, wherein: To receive the downlink transmission, the one or more instructions, when executed by the one or more processors, cause the UE to: performing minimum mean square error equalization on the downlink transmission to produce a first stream associated with the first layer and a second stream associated with the second layer; aggregating, for a symbol having at least one resource allocated for an amplitude-modulated PT-RS, a signal received via a resource allocated for an amplitude-modulated PT-RS; generating complex coefficients for corresponding symbols of at least one resource allocated for an amplitude modulated PT-RS based at least in part on aggregated signals received via the resources allocated for an amplitude modulated PT-RS; as well as A common phase error for respective symbols having at least one resource allocated for an amplitude modulated PT-RS is determined based at least in part on the complex coefficients.

28. An apparatus for wireless communication, comprising: means for sending an indication of a capability of a user equipment (UE) to transmit an amplitude modulated phase tracking reference signal (PT-RS) on at least the first layer of a multi-layer communication link comprising a first layer and a second layer; as well as means for transmitting an uplink transmission or a downlink transmission using the amplitude modulated PT-RS on at least the first layer of the multi-layer communication link based at least in part on the indication, the amplitude modulated PT-RS comprising: a PT-RS sequence indicated by the phase of the amplitude modulated PT-RS, and At least downlink shared channel data or uplink shared channel data is indicated by the amplitude of the amplitude-modulated PT-RS.

29. The device according to claim 28, wherein To transmit the uplink transmission or the downlink transmission, the apparatus comprises means for receiving the downlink transmission having the amplitude modulated PT-RS on a resource set on the first layer or sending the uplink transmission having the amplitude modulated PT-RS on a resource set on the first layer, and In order to receive the downlink transmission or send the uplink transmission, the apparatus includes: means for receiving the downlink transmission having an amplitude modulated PT-RS on the set of resources on the second layer or sending the uplink transmission having an amplitude modulated PT-RS on the set of resources on the second layer, or Means for receiving the downlink transmission having at least the downlink shared channel data on the set of resources on the second layer or sending the uplink transmission having at least the uplink shared channel data on the set of resources on the second layer.

30. The device according to claim 28, wherein To receive the downlink transmission, the apparatus comprises: means for performing minimum mean square error equalization on the downlink transmission to produce a first stream associated with the first layer and a second stream associated with the second layer; means for aggregating signals received via resources allocated for an amplitude modulated PT-RS for symbols having at least one resource allocated for an amplitude modulated PT-RS; means for generating complex coefficients for corresponding symbols of at least one resource allocated for an amplitude modulated PT-RS based at least in part on aggregated signals received via the resources allocated for an amplitude modulated PT-RS; and Means for determining a common phase error for respective symbols having at least one resource allocated for an amplitude modulated PT-RS based at least in part on the complex coefficients.

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