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WO2021226144A1 - Commutation dynamique entre une modulation cohérente et non cohérente pour une communication à faible latence ultra-fiable (urllc) - Google Patents

Commutation dynamique entre une modulation cohérente et non cohérente pour une communication à faible latence ultra-fiable (urllc) Download PDF

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Publication number
WO2021226144A1
WO2021226144A1 PCT/US2021/030733 US2021030733W WO2021226144A1 WO 2021226144 A1 WO2021226144 A1 WO 2021226144A1 US 2021030733 W US2021030733 W US 2021030733W WO 2021226144 A1 WO2021226144 A1 WO 2021226144A1
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WIPO (PCT)
Prior art keywords
wireless communication
communication device
modulation mode
coherent modulation
urllc
Prior art date
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PCT/US2021/030733
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English (en)
Inventor
Amit BAR-OR TILLINGER
Assaf Touboul
Shay Landis
Jacob Pick
Idan Michael Horn
Ran Berliner
Michael Levitsky
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Qualcomm Inc
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Qualcomm Inc
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0008—Modulated-carrier systems arrangements for allowing a transmitter or receiver to use more than one type of modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/20—Modulator circuits; Transmitter circuits

Definitions

  • the technology described below relates generally to wireless communication systems, and more particularly to dynamically switching between coherent modulation/demodulation and non coherent modulation/demodulation for ultra-reliable low-latency communication (URLLC) in wireless communication systems.
  • URLLC ultra-reliable low-latency communication
  • Certain embodiments can enable and provide techniques for improving URLLC performance, increasing robustness against channel conditions, and/or reducing receiver complexity, processing latency, and/or memory usage.
  • a wireless multiple-access communications system may include a number of base stations (BSs), each simultaneously supporting communications for multiple communication devices (e.g., user equipment (UE)).
  • BSs base stations
  • UE user equipment
  • NR next generation new radio
  • LTE long term evolution
  • NR next generation new radio
  • 5G 5 th Generation
  • LTE long term evolution
  • NR next generation new radio
  • NR is designed to provide a lower latency, a higher bandwidth or a higher throughput, and a higher reliability than LTE.
  • NR is designed to operate over a wide array of spectrum bands, for example, from low-frequency bands below about 1 gigahertz (GHz) and mid-frequency bands from about 1 GHz to about 6 GHz, to high-frequency bands such as millimeter wave (mmWave) bands.
  • mmWave millimeter wave
  • NR is also designed to operate across different spectrum types, from licensed spectrum to unlicensed and shared spectrum.
  • Some aspects of the present disclosure enable and provide mechanisms and techniques enabling improved ultra-reliable low-latency communication (URLLC) performance, increased robustness against channel condition, and/or reduced receiver processing latency, complexity, and/or memory utilization. Such improvements may be brought about via disclosed aspects, embodiments, and techniques providing dynamic switching between coherent modulation/demodulation and non-coherent modulation/demodulation for URLLC.
  • a transmitter may transmit a first URLLC signal during a time period by coherently modulating first URLLC data based on a coherent modulation mode.
  • the transmitter may transmit a second URLLC signal during another time period by non-coherently modulating second URLLC information data based on a non-coherent modulation mode.
  • the transmitter may switch between the coherent modulation mode and the non-coherent modulation mode based on various factors, such as a transmission signal waveform (e.g., an orthogonal frequency-division multiplexing (OFDM) waveform or a single carrier waveform), a channel condition, a channel measurement, a signal-to-noise-ratio (SNR), a modulation coding scheme (MCS), an allocation size, and/or spectral efficiency associated with the first URLLC signal or the second URLLC signal.
  • a transmission signal waveform e.g., an orthogonal frequency-division multiplexing (OFDM) waveform or a single carrier waveform
  • OFDM orthogonal frequency-division multiplexing
  • SNR signal-to-noise-ratio
  • MCS modulation coding scheme
  • a method of wireless communication includes transmitting, by a first wireless communication device to a second wireless communication device based on a coherent modulation mode, a first communication signal including coherently modulated first information data. The method also includes transmitting, by the first wireless communication device to the second wireless communication device based on a non-coherent modulation mode, a second communication signal including non-coherently modulated second URLLC information data.
  • a method of wireless communication includes receiving, by a first wireless communication device from a second wireless communication device based on a coherent modulation mode, a first communication signal including coherently modulated first information data. The method also includes receiving, by the first wireless communication device from the second wireless communication device based on a non-coherent modulation mode, a second communication signal including non-coherently modulated second information data.
  • a first wireless communication device includes a memory, a transceiver, and at least one processor coupled to the memory and the transceiver, wherein the first wireless communication device is configured to transmit, to a second wireless communication device based on a coherent modulation mode, a first communication signal including coherently modulated first information data.
  • the first wireless communication device is also configured to transmit, to the second wireless communication device based on a non-coherent modulation mode, a second communication signal including non-coherently modulated second information data.
  • a first wireless communication device includes a memory, a transceiver, and at least one processor coupled to the memory and the transceiver, wherein the first wireless communication device is configured to receive, from a second wireless communication device based on a coherent modulation mode, a first communication signal including coherently modulated first information data.
  • the first wireless communication device is also configured to receive, from the second wireless communication device based on a non-coherent modulation mode, a second communication signal including non-coherently modulated second information data.
  • a non-transitory computer-readable medium having program code recorded thereon includes code for causing a first wireless communication device to transmit, to a second wireless communication device based on a coherent modulation mode, a first communication signal including coherently modulated first information data.
  • the program code also includes code for causing the first wireless communication device to transmit, to the second wireless communication device based on a non-coherent modulation mode, a second communication signal including non-coherently modulated second information data.
  • a non-transitory computer-readable medium having program code recorded thereon the program code includes code for causing a first wireless communication device to receive, from a second wireless communication device based on a coherent modulation mode, a first signal including coherently modulated first information data.
  • the program code also includes code for causing the first wireless communication device to receive, from the second wireless communication device based on a non-coherent modulation mode, a second communication signal including non-coherently modulated second information data.
  • a first wireless communication device includes means for transmitting, to a second wireless communication device based on a coherent modulation mode, a first signal including coherently modulated first information data.
  • the first wireless communication device also includes means for transmitting, to the second wireless communication device based on a non-coherent modulation mode, a second communication signal including non- coherently modulated second information data.
  • a first wireless communication device includes means for receiving, from a second wireless communication device based on a coherent modulation mode, a first communication signal including coherently modulated first information data.
  • the first wireless communication device also includes means for receiving, from the second wireless communication device based on a non-coherent modulation mode, a second communication signal including non-coherently modulated second information data.
  • FIG. 1 illustrates a wireless communication network according to some aspects of the present disclosure.
  • FIG. 2 illustrates a radio frame structure according to some aspects of the present disclosure.
  • FIG. 3 illustrates various mini-slot configurations according to some aspects of the present disclosure.
  • FIG. 4A illustrates a downlink (DL) ultra-reliable low-latency communication (URLLC) according to some aspects of the present disclosure.
  • FIG. 4B illustrates an uplink (UL) URLLC according to some aspects of the present disclosure.
  • DL downlink
  • UL uplink
  • FIG. 5 is a block diagram of an exemplary base station (BS) according to some aspects of the present disclosure.
  • FIG. 6 is a block diagram of an exemplary user equipment (UE) according to some aspects of the present disclosure.
  • FIG. 7A illustrates a URLLC communication method with dynamic switching between coherent modulation and non-coherent modulation according to some aspects of the present disclosure.
  • FIG. 7B illustrates a wireless communication network including a non-coherent URLLC transmitter and a non-coherent URLLC receiver according to some aspects of the present disclosure.
  • FIG. 7C illustrates a wireless communication network including a coherent URLLC transmitter and a coherent URLLC receiver according to some aspects of the present disclosure.
  • FIG. 8A illustrates a non-coherent DL URLLC according to some aspects of the present disclosure.
  • FIG. 8B illustrates a non-coherent UL URLLC according to some aspects of the present disclosure.
  • FIG. 9 illustrates a wireless communication network including a non-coherent URLLC transmitter and a non-coherent URLLC receiver according to some aspects of the present disclosure.
  • FIG. 10 is a flow diagram of a wireless communication method according to some aspects of the present disclosure.
  • FIG. 11 is a flow diagram of a wireless communication method according to some aspects of the present disclosure.
  • the techniques and apparatus may be used for wireless communication networks such as code division multiple access (CDMA) networks, time division multiple access (TDMA) networks, frequency division multiple access (FDMA) networks, orthogonal FDMA (OFDMA) networks, single-carrier FDMA (SC-FDMA) networks, LTE networks, Global System for Mobile Communications (GSM) networks, 5 th Generation (5G) or new radio (NR) networks, as well as other communications networks.
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal FDMA
  • SC-FDMA single-carrier FDMA
  • LTE Long Term Evolution
  • GSM Global System for Mobile Communications
  • 5G 5 th Generation
  • NR new radio
  • An OFDMA network may implement a radio technology such as evolved UTRA (E- UTRA), Institute of Electrical and Electronics Engineers (IEEE) 802.11, IEEE 802.16, IEEE 802.20, flash-OFDM and the like.
  • E- UTRA evolved UTRA
  • IEEE Institute of Electrical and Electronics Engineers
  • GSM Global System for Mobile communications
  • LTE long term evolution
  • UTRA, E-UTRA, GSM, UMTS and LTE are described in documents provided from an organization named “3rd Generation Partnership Project” (3GPP), and cdma2000 is described in documents from an organization named “3rd Generation Partnership Project 2” (3GPP2).
  • 3GPP 3rd Generation Partnership Project
  • 3GPP long term evolution LTE
  • LTE long term evolution
  • the 3GPP may define specifications for the next generation of mobile networks, mobile systems, and mobile devices.
  • the present disclosure is concerned with the evolution of wireless technologies from LTE, 4G, 5G, NR, and beyond with shared access to wireless spectrum between networks using a collection of new and different radio access technologies or radio air interfaces.
  • 5G networks contemplate diverse deployments, diverse spectrum, and diverse services and devices that may be implemented using an OFDM-based unified, air interface.
  • further enhancements to LTE and LTE-A are considered in addition to development of the new radio technology for 5G NR networks.
  • the 5G NR will be capable of scaling to provide coverage (1) to a massive Internet of things (IoTs) with a ULtra-high density (e.g., ⁇ 1M nodes/km 2 ), ultra-low complexity (e.g., ⁇ 10s of bits/sec), ultra-low energy (e.g., -10+ years of battery life), and deep coverage with the capability to reach challenging locations; (2) including mission-critical control with strong security to safeguard sensitive personal, financial, or classified information, ultra-high reliability (e.g., -99.9999% reliability), ultra-low latency (e.g., - 1 ms), and users with wide ranges of mobility or lack thereof; and (3) with enhanced mobile broadband including extreme high capacity (e.g., ⁇ 10 Tbps/km 2 ), extreme data rates (e.g., multi- Gbps rate, 100+ Mbps user experienced rates), and deep awareness with advanced discovery and optimizations.
  • IoTs Internet of things
  • ultra-low complexity e.g., ⁇ 10s of bits/
  • a 5G NR communication system may be implemented to use optimized OFDM-based waveforms with scalable numerology and transmission time interval (TTI). Additional features may also include having a common, flexible framework to efficiently multiplex services and features with a dynamic, low-latency time division duplex (TDD)/frequency division duplex (FDD) design; and with advanced wireless technologies, such as massive multiple input, multiple output (MEMO), robust millimeter wave (mmWave) transmissions, advanced channel coding, and device-centric mobility. Scalability of the numerology in 5G NR, with scaling of subcarrier spacing, may efficiently address operating diverse services across diverse spectrum and diverse deployments.
  • TTI transmission time interval
  • Additional features may also include having a common, flexible framework to efficiently multiplex services and features with a dynamic, low-latency time division duplex (TDD)/frequency division duplex (FDD) design; and with advanced wireless technologies, such as massive multiple input, multiple output (MEMO), robust millimeter wave (mmWave) transmissions, advanced channel coding, and device-centric
  • subcarrier spacing may occur with 15 kHz, for example over 5, 10, 20 MHz, and the like bandwidth (BW).
  • BW bandwidth
  • subcarrier spacing may occur with 30 kHz over 80/100 MHz BW.
  • the subcarrier spacing may occur with 60 kHz over a 160 MHz BW.
  • subcarrier spacing may occur with 120 kHz over a 500 MHz BW.
  • the scalable numerology of the 5G NR facilitates scalable TTI for diverse latency and quality of service (QoS) requirements. For example, shorter TTI may be used for low latency and high reliability, while longer TTI may be used for higher spectral efficiency.
  • QoS quality of service
  • 5G NR also contemplates a self-contained integrated subframe design with UL/downlink scheduling information, data, and acknowledgement in the same subframe.
  • the self-contained integrated subframe supports communications in unlicensed or contention-based shared spectrum, adaptive UL/downlink that may be flexibly configured on a per-cell basis to dynamically switch between UL and downlink to meet the current traffic needs.
  • a wireless communication network may support ultra-reliable and low-latency communication (URLLC) to accommodate emerging services and applications having stringent latency and reliability requirements.
  • URLLC refers to scenarios where signaling is conditioned or configured for high data integrity and/or low latency operations.
  • URLLC may have a target latency between about 1 ms to about 10 ms and a packet transmission reliability between about 10e-3 about 10e-5, for example, as specified in 3GPP document TS 22.261 Release 18, titled “3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; Service requirements for the 5G system Stage 1” March, 2021 and TS 22.104 Release 18, titled “3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; Service requirements for the cyber-physical control applications in vertical domain Stage 1” March, 2021 which are incorporated herein by reference.
  • URLLC communication can be in a downlink (DL) direction from a base station (BS) to a use equipment (UE) or in an uplink (UL) direction from a UE to a BS.
  • OFDM and single carrier-OFDM (SC- OFDM) waveforms are commonly used for wireless communications.
  • DL transmissions are commonly based on OFDM waveforms
  • UL transmissions may be based on OFDM waveforms or SC-OFDM waveforms.
  • SC-OFDM waveforms may provide several benefits. For example, SC-OFDM waveform signals may have a lower peak-to-average power ratio (PAPR) compared to OFDM waveform signals, and thus may allow for a more power efficient transmitter. Additionally, SC-OFDM waveform transmissions can provide better frequency diversity than un-coded OFDM waveform transmissions.
  • PAPR peak-to-average power ratio
  • a transmitter may transmit one or more demodulation reference signals (DMRSs) along with data and/or control.
  • the data may be URLLC data.
  • URLLC communication generally refers to communicating happening based on desired reliability and latency parameters.
  • URLLC communication can include both control and/or data transmissions.
  • a DMRS may include pilots symbols, which are predetermined values or predetermined modulation symbols, known to both the transmitter and the receiver. The pilot symbols or DMRS can be distributed in time and/or frequency.
  • the transmitter may transmit a DMRS at the beginning time period of a URLLC transmission, followed by URLLC data.
  • the receiver may determine a channel estimate (e.g., a channel amplitude/phase response) from the predetermined DMRS, for example, by comparing the values received in the signal to the pilots it expected. The receiver may then apply the channel estimate to demodulate the received signal and decode the URLLC data from the URLLC transmission.
  • a channel estimate e.g., a channel amplitude/phase response
  • DMRS(s) While including DMRS(s) in a URLLC transmission can facilitate channel estimation at a receiver, the transmission of the DMRS(s) utilizes resources that may otherwise be used (e.g., for transmitting URLLC information or user data).
  • DMRS overhead is generally higher for single carrier waveform transmission (e.g., SC-OFDM) than for OFDM waveform transmission.
  • SC-OFDM single carrier waveform transmission
  • the higher DMRS overhead associated with SC-OFDM waveform transmission is due to OFDM waveform transmission allows for multiplexing of data and pilot symbols in frequency, whereas SC-OFDM waveform transmission may not allow for such multiplexing.
  • channel estimation from the DMRSs can introduce latency since the URLLC data cannot be decoded until channel estimation is completed, leaving less time for URLLC data decoding.
  • the receiver may also have to buffer or store incoming signals in memory while channel estimation is being performed.
  • the processing, logic and/or gates for implementing channel estimation can also be complex.
  • channel estimation can lead to a high processing complexity or demand (e.g., faster than real time) and/or a higher memory usage at the receiver.
  • channel estimation quality can be limited by channel delay spread and/or channel Doppler spread, and thus URLLC performance can be limited by the channel estimation performance.
  • URLLC information data can be differentially encoded onto phase differences; amplitude differences across frequency (e.g., consecutive subcarriers within an OFDM symbol for OFDM waveform); and/or time (e.g., consecutive time samples within an OFDM symbol for SC-OFDM waveform) within each OFDM symbol.
  • coherent modulation where one or more DMRSs are transmitted along with URLLC data in a URLLC transmission may provide different benefits compared to non-coherent modulation. In some scenarios, for example, a channel with a low signal-to-noise-ratio (SNR), the coherent modulation can provide a better performance than the non-coherent modulation.
  • SNR signal-to-noise-ratio
  • a wireless communication device e.g., a BS or a UE
  • the wireless communication device may transmit a second URLLC signal by non-coherently modulating second URLLC information data based on a non-coherent modulation mode.
  • the wireless communication device may dynamically switch between the coherent modulation mode and the non-coherent modulation mode for the URLLC transmission based on various factors.
  • the wireless communication device may switch between the coherent modulation mode and the non-coherent modulation mode based on a transmission waveform associated with the first URLLC signal or the second URLLC signal.
  • DMRS overhead may be higher for an SC-OLDM waveform transmission than an OLDM waveform transmission.
  • the wireless communication device may switch to the coherent modulation mode from the non-coherent modulation mode based on an OLDM waveform associated with the first URLLC signal.
  • the wireless communication device may switch to the non coherent modulation mode from the coherent modulation mode based on an SC-OLDM waveform associated with the second URLLC signal.
  • the wireless communication device may switch between the non-coherent modulation mode and the coherent modulation mode based on a channel measurement. In some aspects, the wireless communication device may switch between the non-coherent modulation mode and the coherent modulation mode based on at least one of a MCS, a SNR, an allocation size or a spectral efficiency associated with the first URLLC signal or the second URLLC signal.
  • a wireless communication device may receive a first URLLC signal including coherently modulated first URLLC data based on a coherent modulation mode.
  • the wireless communication device may receive a second URLLC signal including non-coherently modulated second URLLC information data based on a non-coherent modulation mode. Similar to the URLLC transmission, the wireless communication device may switch between the coherent modulation mode and the non-coherent modulation mode for the URLLC reception based on various factors, such as a transmission waveform a channel measurement, a MCS, a SNR, an allocation size, and/or a spectral efficiency associated with the first URLLC signal or the second URLLC signal.
  • aspects of the present disclosure can provide several benefits for device performance and quality communications.
  • dynamically switching between a coherent modulation mode and a non-coherent modulation mode for URLLC allows a transmitter to provide an optimal URLLC performance based on channel conditions, SNRs, MCS selection, transmission signal waveforms, resource utilization target, and/or spectral efficiency.
  • the transmitter may select a most suitable or optimal combination of operating parameters to meet a certain URLLC performance target, spectral efficiency target, and/or a respective receiver processing latency and/or complexity target.
  • the transmitter may switch to utilize non-coherent modulation.
  • the transmitter may switch to utilize coherent modulation to provide a better performance.
  • the transmitter may switch to the non coherent modulation to benefit from the lower resource utilization or utilize resources that would have been allocated for DMRS transmission for URLLC data transmission.
  • the transmitter may utilize a better or more reliable coding rate with the additional available resources to increase communication reliability, coverage, and/or robustness against channel conditions (e.g., high Doppler and/or large channel delay spread). Additionally or alternatively, the transmitter may utilize the additional resources to increase throughput.
  • a respective receiver may perform data decoding without channel estimation. Eliminating channel estimation at the receiver can enable the receiver to process an incoming signal and perform data decoding as the incoming signal is received instead of postponing the processing and data decoding until channel estimation is completed. Accordingly, receiver processing latency, computation complexity, and/or memory utilization can be reduced and the receiver architecture can be simplified (e.g., without de mapper or channel estimation hardware and/or software). The reduction in complexity, memory, and/or processing components can lead to a lower power consumption and/or a lower cost. Additionally, eliminating channel estimation can remove channel estimation performance limitations from receiver decoding performance. In other words, the receiver decoding performance can be insensitive to channel conditions.
  • the receiver decoding performance may not be impacted by a large channel delay spread or a high Doppler that would otherwise be relying on the accuracy of channel delay and/or Doppler estimations.
  • the non-coherent modulation can allow a transmitter to eliminate the need for transmitting any type of reference signals (e.g., DMRSs and tracking reference signals (TRSs)) that are related to channel estimation and/or time-frequency tracking.
  • DMRSs and tracking reference signals (TRSs) that are related to channel estimation and/or time-frequency tracking.
  • the disclosed aspects and embodiments are descried in the context of switching and/or selecting between coherent modulation/demodulation and non-coherent modulation/demodulation for URLLC in NR, the disclosed aspects and embodiments for switching and/or selecting between coherent modulation/demodulation and non-coherent modulation/demodulation for can be applied to any suitable type of data (e.g., with any suitable latency and/or reliability constraints), any suitable type of waveform signals, and/or any suitable type of wireless access technologies.
  • any suitable type of data e.g., with any suitable latency and/or reliability constraints
  • any suitable type of waveform signals e.g., with any suitable latency and/or reliability constraints
  • any suitable type of wireless access technologies e.g., with any suitable latency and/or reliability constraints
  • the present disclosure may use the term “coherent modulation mode” to refer to coherent modulation at a transmitter and coherent demodulation at a respective receiver and may use the term “non-coherent modulation mode” to refer to non-coherent modulation at a transmitter and non-coherent demodulation or detection at a respective receiver.
  • coherent modulation mode to refer to coherent modulation at a transmitter and coherent demodulation at a respective receiver
  • non-coherent modulation mode to refer to non-coherent modulation at a transmitter and non-coherent demodulation or detection at a respective receiver.
  • embodiments and/or uses may come about via integrated chip embodiments and other non-module-component based devices (e.g., end-user devices, vehicles, communication devices, computing devices, industrial equipment, retail/purchasing devices, medical devices, AI-enabled devices, etc.). While some examples may or may not be specifically directed to use cases or applications, a wide assortment of applicability of described innovations may occur. Implementations may range a spectrum from chip-level or modular components to non- modular, non-chip-level implementations and further to aggregate, distributed, or OEM devices or systems incorporating one or more aspects of the described innovations. In some practical settings, devices incorporating described aspects and features may also necessarily include additional components and features for implementation and practice of claimed and described embodiments.
  • non-module-component based devices e.g., end-user devices, vehicles, communication devices, computing devices, industrial equipment, retail/purchasing devices, medical devices, AI-enabled devices, etc.
  • implementations may range a spectrum from chip-level or modular components to non- modular, non-chip-
  • transmission and reception of wireless signals necessarily includes a number of components for analog and digital purposes (e.g., hardware components including antenna, RF- chains, power amplifiers, modulators, buffer, processor(s), interleaver, adders/summers, etc.). It is intended that innovations described herein may be practiced in a wide variety of devices, chip-level components, systems, distributed arrangements, end-user devices, etc. of varying sizes, shapes, and constitution.
  • FIG. 1 illustrates a wireless communication network 100 according to some aspects of the present disclosure.
  • the network 100 may be a 5G network.
  • the network 100 includes a number of base stations (BSs) 105 (individually labeled as 105a, 105b, 105c, 105d, 105e, and 105f) and other network entities.
  • a BS 105 may be a station that communicates with UEs 115 and may also be referred to as an evolved node B (eNB), a next generation eNB (gNB), an access point, and the like.
  • eNB evolved node B
  • gNB next generation eNB
  • Each BS 105 may provide communication coverage for a particular geographic area.
  • a BS 105 may provide communication coverage for a macro cell or a small cell, such as a pico cell or a femto cell, and/or other types of cell.
  • a macro cell generally covers a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscriptions with the network provider.
  • a small cell, such as a pico cell would generally cover a relatively smaller geographic area and may allow unrestricted access by UEs with service subscriptions with the network provider.
  • a small cell such as a femto cell, would also generally cover a relatively small geographic area (e.g., a home) and, in addition to unrestricted access, may also provide restricted access by UEs having an association with the femto cell (e.g., UEs in a closed subscriber group (CSG), UEs for users in the home, and the like).
  • a BS for a macro cell may be referred to as a macro BS.
  • a BS for a small cell may be referred to as a small cell BS, a pico BS, a femto BS or a home BS. In the example shown in FIG.
  • the BSs 105d and 105e may be regular macro BSs, while the BSs 105a-105c may be macro BSs enabled with one of three dimension (3D), full dimension (FD), or massive MIMO.
  • the BSs 105a- 105c may take advantage of their higher dimension MIMO capabilities to exploit 3D beamforming in both elevation and azimuth beamforming to increase coverage and capacity.
  • the BS 105f may be a small cell BS which may be a home node or portable access point.
  • a BS 105 may support one or multiple (e.g., two, three, four, and the like) cells.
  • the network 100 may support synchronous or asynchronous operation.
  • the BSs may have similar frame timing, and transmissions from different BSs may be approximately aligned in time.
  • the BSs may have different frame timing, and transmissions from different BSs may not be aligned in time.
  • the UEs 115 may be dispersed throughout the wireless network 100, and each UE 115 may be stationary or mobile. UEs can take in a variety of forms and a range of form factors.
  • a UE 115 may also be referred to as a terminal, a mobile station, a subscriber unit, a station, or the like.
  • a UE 115 may be a cellular phone, a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a tablet computer, a laptop computer, a cordless phone, a wireless local loop (WLL) station, or the like.
  • PDA personal digital assistant
  • WLL wireless local loop
  • a UE 115 may be a device that includes a Universal Integrated Circuit Card (UICC).
  • UICC Universal Integrated Circuit Card
  • a UE may be a device that does not include a UICC.
  • the UEs 115 that do not include UICCs may also be referred to as IoT devices or internet of everything (IoE) devices.
  • the UEs 115a-l 15d are examples of mobile smart phone-type devices accessing network 100.
  • a UE 115 may also be a machine specifically configured for connected communication, including machine type communication (MTC), enhanced MTC (eMTC), narrowband IoT (NB-IoT) and the like.
  • MTC machine type communication
  • eMTC enhanced MTC
  • NB-IoT narrowband IoT
  • the UEs 115e-115h are examples of various machines configured for communication that access the network 100.
  • the UEs 115i-l 15k are examples of vehicles equipped with wireless communication devices configured for communication that access the network 100.
  • a UE 115 may be able to communicate with any type of the BSs, whether macro BS, small cell, or the like.
  • a lightning bolt e.g., communication links indicates wireless transmissions between a UE 115 and a serving BS 105, which is a BS designated to serve the UE 115 on the downlink (DL) and/or uplink (UL), desired transmission between BSs 105, backhaul transmissions between BSs, or sidelink transmissions between UEs 115.
  • the BSs 105a- 105c may serve the UEs 115a and 115b using 3D beamforming and coordinated spatial techniques, such as coordinated multipoint (CoMP) or multi-connectivity.
  • the macro BS 105d may perform backhaul communications with the BSs 105a-105c, as well as small cell, the BS 105f.
  • the macro BS 105d may also transmits multicast services which are subscribed to and received by the UEs 115c and 115d.
  • Such multicast services may include mobile television or stream video, or may include other services for providing community information, such as weather emergencies or alerts, such as Amber alerts or gray alerts.
  • the BSs 105 may also communicate with a core network.
  • the core network may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions.
  • IP Internet Protocol
  • At least some of the BSs 105 (e.g., which may be an example of a gNB or an access node controller (ANC)) may interface with the core network through backhaul links (e.g., NG-C, NG-U, etc.) and may perform radio configuration and scheduling for communication with the UEs 115.
  • the BSs 105 may communicate, either directly or indirectly (e.g., through core network), with each other over backhaul links (e.g., XI, X2, etc.), which may be wired or wireless communication links.
  • backhaul links e.g., XI, X2, etc.
  • the network 100 may also support mission critical communications with ultra-reliable and redundant links for mission critical devices, such as the UE 115e, which may be a drone.
  • mission critical devices such as the UE 115e, which may be a drone.
  • Redundant communication links with the UE 115e may include links from the macro BSs 105d and 105e, as well as links from the small cell BS 105f.
  • Other machine type devices such as the UE 115f (e.g., a thermometer), the UE 115g (e.g., smart meter), and UE 115h (e.g., wearable device) may communicate through the network 100 either directly with BSs, such as the small cell BS 105f, and the macro BS 105e, or in multi-step-size configurations by communicating with another user device which relays its information to the network, such as the UE 115f communicating temperature measurement information to the smart meter, the UE 115g, which is then reported to the network through the small cell BS 105f.
  • the UE 115f e.g., a thermometer
  • the UE 115g e.g., smart meter
  • UE 115h e.g., wearable device
  • the network 100 may also provide additional network efficiency through dynamic, low-latency TDD/FDD communications, such asV2V, V2X, C-V2X communications between a UE 115i, 115j, or 115k and other UEs 115, and/or vehicle-to- infrastructure (V2I) communications between a UE 115i, 115j, or 115k and a BS 105.
  • V2V dynamic, low-latency
  • V2X V2X
  • C-V2X communications between a UE 115i, 115j, or 115k and other UEs 115
  • V2I vehicle-to- infrastructure
  • the network 100 utilizes OFDM-based waveforms for communications.
  • An OFDM-based system may partition the system BW into multiple (K) orthogonal subcarriers, which are also commonly referred to as subcarriers, tones, bins, or the like. Each subcarrier may be modulated with data.
  • the subcarrier spacing between adjacent subcarriers may be fixed, and the total number of subcarriers (K) may be dependent on the system BW.
  • the system BW may also be partitioned into subbands. In other instances, the subcarrier spacing and/or the duration of TTIs may be scalable.
  • the BSs 105 can assign or schedule transmission resources (e.g., in the form of time-frequency resource blocks (RB)) for downlink (DL) and uplink (UL) transmissions in the network 100.
  • DL refers to the transmission direction from a BS 105 to a UE 115
  • UL refers to the transmission direction from a UE 115 to a BS 105.
  • the communication can be in the form of radio frames.
  • a radio frame may be divided into a plurality of subframes or slots, for example, about 10. Each slot may be further divided into mini-slots. In a FDD mode, simultaneous UL and DL transmissions may occur in different frequency bands.
  • each subframe includes a UL subframe in a UL frequency band and a DL subframe in a DL frequency band.
  • UL and DL transmissions occur at different time periods using the same frequency band.
  • a subset of the subframes (e.g., DL subframes) in a radio frame may be used for DL transmissions and another subset of the subframes (e.g., UL subframes) in the radio frame may be used for UL transmissions.
  • each DL or UL subframe may have pre-defined regions for transmissions of reference signals, control information, and data.
  • Reference signals are predetermined signals that facilitate the communications between the BSs 105 and the UEs 115.
  • a reference signal can have a particular pilot pattern or structure, where pilot tones may span across an operational BW or frequency band, each positioned at a pre-defined time and a pre-defined frequency.
  • a BS 105 may transmit cell specific reference signals (CRSs) and/or channel state information - reference signals (CSI-RSs) to enable a UE 115 to estimate a DL channel.
  • CRSs cell specific reference signals
  • CSI-RSs channel state information - reference signals
  • a UE 115 may transmit sounding reference signals (SRSs) to enable a BS 105 to estimate a UL channel.
  • Control information may include resource assignments and protocol controls.
  • Data may include protocol data and/or operational data.
  • the BSs 105 and the UEs 115 may communicate using self-contained subframes.
  • a self-contained subframe may include a portion for DL communication and a portion for UL communication.
  • a self-contained subframe can be DL-centric or UL-centric.
  • a DL-centric subframe may include a longer duration for DL communication than for UL communication.
  • a UL-centric subframe may include a longer duration for UL communication than for UL communication.
  • the network 100 may be an NR network deployed over a licensed spectrum.
  • the BSs 105 can transmit synchronization signals (e.g., including a primary synchronization signal (PSS) and a secondary synchronization signal (SSS)) in the network 100 to facilitate synchronization.
  • the BSs 105 can broadcast system information associated with the network 100 (e.g., including a master information block (MIB), remaining system information (RMSI), and other system information (OSI)) to facilitate initial network access.
  • MIB master information block
  • RMSI remaining system information
  • OSI system information
  • the BSs 105 may broadcast the PSS, the SSS, and/or the MIB in the form of synchronization signal block (SSBs) over a physical broadcast channel (PBCH) and may broadcast the RMSI and/or the OSI over a physical downlink shared channel (PDSCH).
  • PBCH physical broadcast channel
  • PDSCH physical downlink shared channel
  • a UE 115 attempting to access the network 100 may perform an initial cell search by detecting a PSS from a BS 105.
  • the PSS may enable synchronization of period timing and may indicate a physical layer identity value.
  • the UE 115 may then receive a SSS.
  • the SSS may enable radio frame synchronization, and may provide a cell identity value, which may be combined with the physical layer identity value to identify the cell.
  • the PSS and the SSS may be located in a central portion of a carrier or any suitable frequencies within the carrier.
  • the UE 115 may receive a MIB.
  • the MIB may include system information for initial network access and scheduling information for RMSI and/or OSI.
  • the UE 115 may receive RMSI and/or OSI.
  • the RMSI and/or OSI may include radio resource control (RRC) information related to random access channel (RACH) procedures, paging, control resource set (CORESET) for physical downlink control channel (PDCCH) monitoring, physical UL control channel (PUCCH), physical UL shared channel (PUSCH), power control, and SRS.
  • RRC radio resource control
  • the UE 115 can perform a random access procedure to establish a connection with the BS 105.
  • the random access procedure (or RACH procedure) may be a single or multiple step process.
  • the random access procedure may be a four-step random access procedure.
  • the UE 115 may transmit a random access preamble and the BS 105 may respond with a random access response.
  • the random access response may include a detected random access preamble identifier (ID) corresponding to the random access preamble, timing advance (TA) information, a UL grant, a temporary cell-radio network temporary identifier (C-RNTI), and/or a backoff indicator.
  • ID detected random access preamble identifier
  • TA timing advance
  • C-RNTI temporary cell-radio network temporary identifier
  • the UE 115 may transmit a connection request to the BS 105 and the BS 105 may respond with a connection response.
  • the connection response may indicate a contention resolution.
  • the random access preamble, the RAR, the connection request, and the connection response can be referred to as message 1 (MSG1), message 2 (MSG2), message 3 (MSG3), and message 4 (MSG4), respectively.
  • the random access procedure may be a two-step random access procedure, where the UE 115 may transmit a random access preamble and a connection request in a single transmission and the BS 105 may respond by transmitting a random access response and a connection response in a single transmission.
  • the UE 115 and the BS 105 can enter a normal operation stage, where operational data may be exchanged.
  • the BS 105 may schedule the UE 115 for UL and/or DL communications.
  • the BS 105 may transmit UL and/or DL scheduling grants to the UE 115 via a PDCCH. Scheduling grants may be transmitted in the form of DL control information (DCI).
  • the BS 105 may transmit a DL communication signal (e.g., carrying data) to the UE 115 via a PDSCH according to a DL scheduling grant.
  • the UE 115 may transmit a UL communication signal to the BS 105 via a PUSCH and/or PUCCH according to a UL scheduling grant.
  • the network 100 may operate over a system BW or a component carrier (CC) BW.
  • the network 100 may partition the system BW into multiple BWPs (e.g., portions).
  • a BS 105 may dynamically assign a UE 115 to operate over a certain BWP (e.g., a certain portion of the system BW).
  • the assigned BWP may be referred to as the active BWP.
  • the UE 115 may monitor the active BWP for signaling information from the BS 105.
  • the BS 105 may schedule the UE 115 for UL or DL communications in the active BWP.
  • a BS 105 may assign a pair of BWPs within the CC to a UE 115 for UL and DL communications.
  • the BWP pair may include one BWP for UL communications and one BWP for DL communications.
  • the network 100 may support URLLC to accommodate emerging services and applications having stringent latency and reliability requirements.
  • URLLC may have a target latency of about 1 ms and a packet transmission reliability of about 10e-5.
  • Some example applications requiring URLLC services may include industrial automation, self-driving cars, drones, robots, power grid systems, sensors, smart meters, alarm systems, healthcare monitoring, and/or any applications requiring time-critical remote interactions.
  • URLLC can be in a DL direction from a BS 105 to a UE 115 or in a UL direction from a UE 115 to a BS 105.
  • the BS 105 and the UE 115 may dynamically switch between a non-coherent modulation mode and a coherent modulation mode for URLLC, for example, based on a URLLC transmission signal waveform, a channel condition, an SNR, a MCS, an allocation size, and/or a spectral efficiency.
  • a non-coherent modulation mode and a coherent modulation mode for URLLC for example, based on a URLLC transmission signal waveform, a channel condition, an SNR, a MCS, an allocation size, and/or a spectral efficiency.
  • FIG. 2 illustrates a radio frame structure 200 according to some aspects of the present disclosure.
  • the radio frame structure 200 may be employed by BSs such as the BSs 105 and UEs such as the UEs 115 in a network such as the network 100 for communications.
  • the BS may communicate with the UE using time-frequency resources configured as shown in the radio frame structure 200.
  • the x-axes represent time in some arbitrary units and the y-axes represent frequency in some arbitrary units.
  • the radio frame structure 200 includes a radio frame 201.
  • the duration of the radio frame 201 may vary depending on the aspects. In an example, the radio frame 201 may have a duration of about ten milliseconds.
  • the radio frame 201 includes M number of slots 202, where M may be any suitable positive integer. In an example, M may be about 10.
  • Each slot 202 includes a number of subcarriers 204 in frequency and a number of symbols 206 in time.
  • the number of subcarriers 204 and/or the number of symbols 206 in a slot 202 may vary depending on the aspects, for example, based on the channel bandwidth, the subcarrier spacing (SCS), and/or the CP mode.
  • One subcarrier 204 in frequency and one symbol 206 in time forms one resource element (RE) 212 for transmission.
  • a resource block (RB) 210 is formed from a number of consecutive subcarriers 204 in frequency and a number of consecutive symbols 206 in time.
  • a BS may schedule a UE (e.g., UE 115 in FIG. 1) for UL and/or DL communications at a time-granularity of slots 202 or mini- slots 208.
  • Each slot 202 may be time-partitioned into K number of mini-slots 208.
  • Each mini-slot 208 may include one or more symbols 206.
  • the mini-slots 208 in a slot 202 may have variable lengths. For example, when a slot 202 includes N number of symbols 206, a mini-slot 208 may have a length between one symbol 206 and (N-l) symbols 206.
  • a mini-slot 208 may have a length of about two symbols 206, about four symbols 206, or about seven symbols 206.
  • the BS may schedule UE at a frequency-granularity of a resource block (RB) 210 (e.g., including about 12 subcarriers 204).
  • RB resource block
  • FIG. 3 illustrates various mini-slot configurations according to some aspects of the present disclosure.
  • the mini-slot configurations include mini-slots 302, 304, 306, 308, 310, 312, 314, 316, and/or 318 may be employed by BSs such as the BSs 105 and UEs such as the UEs 115 in a network such as the network 100 for communications.
  • the BS may communicate with the UE using the mini-slots 302, 304, 306, 308, 310., 312, 314, 316, and/or 318.
  • the x- axis represents time in units of OFDM symbols
  • the y-axis represents frequency in some arbitrary units.
  • the mini-slots 302, 304, 306, 308, 310, 312, 314, 316, and 318 may correspond to the mini-slots 208 of FIG. 2.
  • the mini-slots 302, 304, 306, 308, 310., 312, 314, 316, and/or 318 may have a duration of two symbols 206 (indexed 0 to 1), 4 symbols (indexed 0 to 3), and/or 7 symbols (indexed from 0 to 6) as shown or any suitable durations.
  • Each of the mini-slots 302, 304, 306, 308, 310., 312, 314, 316, and 318 may include a DMRS portion 320, a CORESET portion 330, and/or a data portion 340.
  • Each CORESET portion 330 may carry a PDCCH signal (e.g., including UL scheduling grants and/or DL scheduling grant) transmitted by a BS (e.g., the BSs 105).
  • the PDCCH signal may schedule a UE for UL communication and/or DL communication.
  • Each data portion 340 may carry a PDSCH signal (e.g., including DL data) transmitted by a BS or a PUSCH signal (e.g., including UL data) transmitted by a UE (e.g., the UEs 115).
  • Each DMRS portion 320 in a mini-slot 302, 304, 306, 308, 310., 312, 314, 316, and/or 318 may carry one or more DMRSs.
  • Each DMRS may include one or more pilot symbols (e.g., predetermined values) distributed in frequency and/or time in any suitable manner.
  • the DMRS(s) may facilitate channel estimation and decoding of a corresponding data portion 340 in the mini-slot 302, 304, 306, 308, 310., 312, 314, 316, and/or 318.
  • the BS may schedule the UE for a DL communication in the mini-slot 302.
  • the BS may transmit a DMRS in a DMRS portion 320 of the mini-slot 302 and transmit a PDSCH signal (carrying DL data) in a data portion 340 of the mini-slot 302.
  • the DMRS can facilitate channel estimation and decoding of the PDSCH signal at the UE.
  • the BS may schedule the UE for a UL communication in the mini-slot 302.
  • the UE may transmit a DMRS in the DMRS portion 320 of the mini-slot 302 and transmit a PUSCH signal in the data portion 340 of the mini-slot 302.
  • the DMRS can facilitate channel estimation and decoding of the PUSCH signal (carrying UL data) at the BS.
  • a mini-slot (e.g., the mini-slots 304, 306, 310, 314, 316, 318) may include a CORESET portion 330 where a BS may transmit a PDCCH signal to schedule a UE for communication.
  • the PDCCH signal may include scheduling information for the respective mini-slot or another mini-slot (e.g., the mini-slots 302, 308, 312) within the same slot (e.g., the slots 202).
  • FIG. 4A illustrates a DL URLLC 400 according to some aspects of the present disclosure.
  • the DL URLLC 400 may correspond to a DL URLLC between a BS 105 and a UE 115 in the network 100.
  • the x-axis represents time in units of OFDM symbols
  • the y-axis represents frequency in some arbitrary units.
  • the DL URLLC 400 may utilize the radio frame structure and/or mini-slot structure discussed above with reference to FIGS. 2 and/or 3, respectively.
  • a BS may transmit a PDCCH signal 420 (at symbol 206 indexed 0) to schedule a UE (e.g., the UEs 115) for a DL URLLC.
  • the BS may transmit a DL URLLC signal to the UE according to the schedule (at symbols 206 indexed 1 to 5).
  • the DL URLLC signal may include one or more DMRSs 410 (at symbols 206 indexed 1 and 5) and a PDSCH signal 430 (at symbols 206 indexed 2 to 4).
  • the DMRSs 410 may carry predetermined pilots.
  • the DMRS 410 can facilitate channel estimation at the receiving UE.
  • the PDSCH signal 430 may carry DL URLLC data.
  • the BS may apply HARQ techniques to the DL URLLC.
  • the UE may decode the DL URLLC data from the PDSCH signal 430 based on the estimated channel and generate an ACK/NACK feedback for the decoding of the DL URLLC data.
  • the BS may indicate in the PDCCH signal 420 a resource within the same slot for the UE to transmit the ACK/NACK feedback.
  • the PDCCH signal 420 may indicate the symbol 206 indexed 10 spaced apart from the end of the PDSCH signal 430 by a gap 402.
  • the gap 402 provides time for the UE to decode the DL URLLC data from the PDSCH signal 430 and generate the ACK/NACK feedback.
  • the UE may transmit the ACK/NACK feedback to the BS in a PUCCH signal 440 (at symbol 206 indexed 10).
  • LIG. 4A illustrates that the PDCCH signal 420 occupies one symbol 206, the DMRS 410 occupies two symbols 206, and the PDSCH signal 430 occupies three symbols 206, the PDCCH signal 420, the DMRS 410, and/or the PDSCH signal 430 can be configured in any suitable arrangements, occupying a greater number of symbols 206 or a fewer number of symbols 206.
  • PIG. 4B illustrates a UL URLLC 460 according to some aspects of the present disclosure.
  • the UL URLLC 460 may correspond to a UL URLLC between a BS 105 and a UE 115 in the network 100.
  • the x-axis represents time in units of OPDM symbols
  • the y-axis represents frequency in some arbitrary units.
  • the UL URLLC 460 may utilize the radio frame structure and/or mini-slot structure discussed above with reference to PIGS. 2 and 3.
  • a BS may transmit a PDCCH signal 420 (at symbol 206 indexed 0) to schedule a UE (e.g., the UEs 115) for a UL URLLC.
  • the BS may schedule the UL URLLC after a gap 404, for example, at symbols 206 indexed 9 and 10.
  • the gap 404 provides time for the UE to decode the UL URLLC schedule from the PDCCH signal 420.
  • the UE may transmit a UL URLLC signal including a DMRS 410 and PUSCH signal 450 according to the UL URLLC schedule.
  • the DMRSs 410 may carry predetermined pilots.
  • the DMRS 410 can facilitate channel estimation at the receiving BS.
  • the PUSCH signal 450 may carry UL URLLC data.
  • the UE may apply HARQ techniques to the UL URLLC.
  • the BS may decode the UL URLLC data from the PUSCH signal 450 based on the estimated channel.
  • the BS may determine whether to schedule the UE for a retransmission or a new transmission based on the status of the PUSCH decoding.
  • FIG. 4B illustrates the PDCCH signal 420 occupying two symbols 206, the DMRS 410 occupying one symbol 206, and the PUSCH signal 450 occupying one symbol 206
  • the PDCCH signal 420, the DMRS 410, and/or the PUSCH signal 450 can be configured in any suitable arrangements, occupying a greater number of symbols 206 or a fewer number of symbols 206.
  • DMRS(s) 410 can facilitate channel estimation, the transmission of the DMRS(s) 410 utilizes resources that may otherwise be used for transmitting URLLC data. Since URLLC data may have a small data size (e.g., a few bytes to tens of bytes), the overhead of DMRS can be significant.
  • OFDM waveforms can be used for UF and/or DF URFFC communications. When utilizing OFDM waveforms, URFFC data and DMRS can be frequency-multiplexed to reduce the DMRS overhead.
  • some other network deployments may utilize single carrier waveforms, for example, an SC-OFDM waveform, which may also be referred to as a discrete Fourier transform- spread- OFDM (DFT-s-OFDM) waveform, for UF URFFC.
  • SC-OFDM waveform which may also be referred to as a discrete Fourier transform- spread- OFDM (DFT-s-OFDM) waveform
  • future network deployments in FR3 bands and/or FR4 bands may utilize single carrier or DFT-s-OFDM waveforms for UF URFFC and/or DF URFFC.
  • URFFC data and DMRSs may not be frequency- multiplexed, but are to be time-multiplexed. The time-multiplexing along with small URFFC data payloads can lead to a large DMRS penalty.
  • DMRS(s) can occupy up to about 50% of available resources.
  • DMRS -based channel estimation can introduce latency since URFFC data cannot be equalized or decoded until channel estimation is completed, leaving less time for URFFC data decoding.
  • the receiver may have to buffer incoming signals while channel estimation is being performed.
  • channel estimation can lead to a higher processing complexity or demand (e.g., faster than real time) and/or a higher memory usage at the receiver, for example, in order for a UE to provide an ACK/NACK feedback with a low-latency.
  • Channel estimation quality can be limited by a channel delay spread (e.g., coherence bandwidth) and/or a channel Doppler spread (e.g., velocity) in some scenarios. For instance, when the channel delay spread is large, the receiver may have a fewer number of DMRS subcarriers in frequency for averaging to estimate the effect of the channel delay spread. In another example, when the channel Doppler spread is large (e.g., at high velocity), the receiver may have a fewer number of DMRS symbols in time for averaging to estimate the effect of the channel Doppler spread. Inaccurate knowledge or estimation of a channel delay spread and/or a channel Doppler spread can degrade channel estimation performance. Additionally, channel estimation can be inaccurate for small-size allocations due to low-quality estimation at edges of the allocation. Low- quality channel estimation can result in poor URLLC performance.
  • a channel delay spread e.g., coherence bandwidth
  • a channel Doppler spread e.g., velocity
  • Non-coherent modulation techniques can reduce usage of DMRS during operations.
  • Non-coherent modulation where information data is differentially encoded onto phase differences and/or amplitude differences in frequency (e.g., across subcarriers 204 within an OFDM symbol 206 for OFDM) and/or time (e.g., across time sample within an OFDM symbol for SC- OFDM), can be used to eliminate DMRS from URLLC transmission.
  • coherent modulation where one or more DMRS are transmitted along with URLLC data in a URLLC transmission, may provide different benefits compared to non-coherent modulation.
  • the coherent modulation can provide a better performance than the non-coherent modulation. Examples coherent modulation/demodulation and non-coherent modulation/demodulation are discussed below with reference to FIGS. 7B and 7C.
  • FIG. 5 is a block diagram of an exemplary BS 500 according to some aspects of the present disclosure.
  • the BS 500 may be a BS 105 in the network 100 as discussed above in FIG. 1.
  • the BS 500 may include a processor 502, a memory 504, a URLLC module 508, a transceiver 510 including a modem subsystem 512 and a RF unit 514, and one or more antennas 516. These elements may be coupled with each other and in direct or indirect communication with each other, for example via one or more buses.
  • the processor 502 may have various features as a specific-type processor. For example, these may include a CPU, a DSP, an ASIC, a controller, a FPGA device, another hardware device, a firmware device, or any combination thereof configured to perform the operations described herein.
  • the processor 502 may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
  • the memory 504 may include a cache memory (e.g., a cache memory of the processor 502), RAM, MRAM, ROM, PROM, EPROM, EEPROM, flash memory, a solid state memory device, one or more hard disk drives, memristor-based arrays, other forms of volatile and non-volatile memory, or a combination of different types of memory.
  • the memory 504 may include a non-transitory computer-readable medium.
  • the memory 504 may store instructions 506.
  • the instructions 506 may include instructions that, when executed by the processor 502, cause the processor 502 to perform operations described herein, for example, aspects of FIGS. 1-3, 4A-4B, 7A-7C, 8A-B, and/or 9-11.
  • Instructions 506 may also be referred to as program code.
  • the program code may be for causing a wireless communication device to perform these operations, for example by causing one or more processors (such as processor 502) to control or command the wireless communication device to do so.
  • processors such as processor 502
  • the terms “instructions” and “code” should be interpreted broadly to include any type of computer-readable statement(s).
  • the terms “instructions” and “code” may refer to one or more programs, routines, sub-routines, functions, procedures, etc.
  • “Instructions” and “code” may include a single computer-readable statement or many computer- readable statements.
  • the URLLC module 508 may be implemented via hardware, software, or combinations thereof.
  • the URLLC module 508 may be implemented as a processor, circuit, and/or instructions 506 stored in the memory 504 and executed by the processor 502.
  • the URLLC module 508 can be integrated within the modem subsystem 512.
  • the URLLC module 508 can be implemented by a combination of software components (e.g., executed by a DSP or a general processor) and hardware components (e.g., logic gates and circuitry) within the modem subsystem 512.
  • the URLLC module 508 may be used for various aspects of the present disclosure, for example, aspects of FIGS. 1-3, 4A-4B, 7A-7C, 8A-B, and/or 9-11.
  • the URLLC module 508 is configured to perform URLLC transmission and/or URLLC reception with a UE (e.g., the UEs 115 of FIG. 1 and/or the UE 600 of FIG. 6). Additionally or alternatively, the URLLC module 508 can be configured to enable dynamic switching between a non-coherent modulation mode and a coherent modulation mode for URLLC transmission and/or reception. Switching between modes may include various triggering events and scenarios as discussed herein. Dynamic switching features can vary for transmission and reception operations.
  • the URLLC module 508 is configured to transmit a first URLLC signal including coherently modulated first URLLC information data to the UE based on a coherent modulation mode, switch between the coherent modulation mode and the non-coherent modulation mode, and transmit a second URLLC signal including non-coherently modulated second URLLC information data to the UE based on the non-coherent modulation mode.
  • the first URLLC signal may include one or more DMRSs (including pilot symbols distributed in time and/or frequency) based on the coherent modulation mode.
  • the second URLLC signal may not include any DMRS based on the non-coherent modulation mode.
  • the URLLC module 508 is configured to receive a third URLLC signal including coherently modulated third URLLC information data from the UE based on a coherent modulation mode, switch between the coherent modulation mode and the non-coherent modulation mode, and receive a fourth URLLC signal including non-coherently modulated fourth URLLC information data to the UE based on the non-coherent modulation mode.
  • the third URLLC signal may include one or more DMRSs (including pilot symbols distributed in time and/or frequency) based on the coherent modulation mode.
  • the fourth URLLC signal may not include any DMRS based on the non-coherent modulation mode.
  • the URLLC module 508 may be configured to switch between the coherent modulation mode and the non-coherent modulation mode based on various factors. In some aspects the URLLC module 508 may be configured to switch between the non-coherent modulation mode and the coherent modulation mode for the URLLC transmission and/or the URLLC reception based on a channel measurement, a MCS, a SNR, an allocation size, and/or a spectral efficiency. In some aspects, for the URLLC transmission, the URLLC module 508 may be configured to switch to the coherent modulation mode from the non-coherent modulation mode based on an OLDM waveform associated with the first URLLC signal.
  • the URLLC module 508 may be configured to switch to the non-coherent modulation mode from the coherent modulation mode based on an SC-OLDM waveform associated with the second URLLC signal.
  • the URLLC module 508 may be configured to switch to the coherent modulation mode from the non-coherent modulation mode based on an OLDM waveform associated with the third URLLC signal.
  • the URLLC module 508 may be configured to switch to the non coherent modulation mode from the coherent modulation mode based on an SC-OLDM waveform associated with the fourth URLLC signal.
  • the transceiver 510 may include the modem subsystem 512 and the RL unit 514.
  • the transceiver 510 can be configured to communicate bi-directionally with other devices, such as the UEs 115 and/or another core network element.
  • the modem subsystem 512 may be configured to modulate and/or encode data according to a MCS, e.g., a LDPC coding scheme, a turbo coding scheme, a convolutional coding scheme, a digital beamforming scheme, etc.
  • the RL unit 514 may be configured to process (e.g., perform analog to digital conversion or digital to analog conversion, etc.) modulated/encoded data (e.g., PDSCH signal, PDCCH signal, DL URLLC data) from the modem subsystem 512 (on outbound transmissions) or of transmissions originating from another source such as a UE 115.
  • the RF unit 514 may be further configured to perform analog beamforming in conjunction with the digital beamforming. Although shown as integrated together in transceiver 510, the modem subsystem 512 and/or the RF unit 514 may be separate devices that are coupled together at the BS 105 to enable the BS 105 to communicate with other devices.
  • the RF unit 514 may provide modulated and/or processed data, e.g. data packets (or, more generally, data messages that may contain one or more data packets and other information), to the antennas 516 for transmission to one or more other devices. This may include, for example, transmission of information to complete attachment to a network and communication with a camped UE 115 according to some aspects of the present disclosure.
  • the antennas 516 may further receive data messages transmitted from other devices and provide the received data messages for processing and/or demodulation at the transceiver 510.
  • the transceiver 510 may provide the demodulated and decoded data (e.g., PUSCH signal, PUCCH signal, UF URFFC data, HARQ ACK-NACKs) to the URFFC module 508 for processing.
  • the antennas 516 may include multiple antennas of similar or different designs to sustain multiple transmission links.
  • the BS 500 can include multiple transceivers 510 implementing different RATs (e.g., NR and FTE).
  • the BS 500 can include a single transceiver 510 implementing multiple RATs (e.g., NR and FTE).
  • the transceiver 510 can include various components, where different combinations of components can implement different RATs.
  • FIG. 6 is a block diagram of an exemplary UE 600 according to some aspects of the present disclosure.
  • the UE 600 may be a UE 115 discussed above in FIG. 1.
  • the UE 600 may include a processor 602, a memory 604, a URFFC module 608, a transceiver 610 including a modem subsystem 612 and a radio frequency (RF) unit 614, and one or more antennas 616.
  • RF radio frequency
  • the processor 602 may include a central processing unit (CPU), a digital signal processor (DSP), an application specific integrated circuit (ASIC), a controller, a field programmable gate array (FPGA) device, another hardware device, a firmware device, or any combination thereof configured to perform the operations described herein.
  • the processor 602 may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
  • the memory 604 may include a cache memory (e.g., a cache memory of the processor 602), random access memory (RAM), magnetoresistive RAM (MRAM), read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read only memory (EPROM), electrically erasable programmable read only memory (EEPROM), flash memory, solid state memory device, hard disk drives, other forms of volatile and non-volatile memory, or a combination of different types of memory.
  • the memory 604 includes a non-transitory computer-readable medium.
  • the memory 604 may store, or have recorded thereon, instructions 606.
  • the instructions 606 may include instructions that, when executed by the processor 602, cause the processor 602 to perform the operations described herein with reference to the UEs 115 in connection with aspects of the present disclosure, for example, aspects of FIGS. 1-3, 4A-4B, 7A- 7C, 8A-B, and/or 9-11. Instructions 606 may also be referred to as program code, which may be interpreted broadly to include any type of computer-readable statement(s) as discussed above with respect to FIG.5.
  • the URLLC module 608 may be implemented via hardware, software, or combinations thereof.
  • the URLLC module 608 may be implemented as a processor, circuit, and/or instructions 606 stored in the memory 604 and executed by the processor 602.
  • the URLLC module 608 can be integrated within the modem subsystem 612.
  • the URLLC module 608 can be implemented by a combination of software components (e.g., executed by a DSP or a general processor) and hardware components (e.g., logic gates and circuitry) within the modem subsystem 612.
  • the URLLC module 608 may be used for various aspects of the present disclosure, for example, aspects of FIGS. 1-3, 4A-4B, 7A-7C, 8A-B, and/or 9-11.
  • the URLLC module 608 is configured to perform URLLC transmission and/or URLLC reception with a BS (e.g., the BSs 105 of FIG. 1 and/or the BS 500 of FIG. 5) and dynamically switching between a non-coherent modulation mode and a coherent modulation mode for URLLC transmission and/or reception.
  • a BS e.g., the BSs 105 of FIG. 1 and/or the BS 500 of FIG. 5
  • the URLLC module 608 is configured to transmit a first URLLC signal including coherently modulated first URLLC information data to the UE based on a coherent modulation mode, switch between the coherent modulation mode and the non-coherent modulation mode, and transmit a second URLLC signal including non-coherently modulated second URLLC information data to the UE based on the non-coherent modulation mode.
  • the first URLLC signal may include one or more DMRSs (including pilot symbols distributed in time and/or frequency) based on the coherent modulation mode.
  • the second URLLC signal may not include any DMRS based on the non-coherent modulation mode.
  • the URLLC module 608 is configured to receive a third URLLC signal including coherently modulated third URLLC information data from the UE based on a coherent modulation mode, switch between the coherent modulation mode and the non-coherent modulation mode, and receive a fourth URLLC signal including non-coherently modulated fourth URLLC information data to the UE based on the non-coherent modulation mode.
  • the third URLLC signal may include one or more DMRSs (including pilot symbols distributed in time and/or frequency) based on the coherent modulation mode.
  • the fourth URLLC signal may not include any DMRS based on the non-coherent modulation mode.
  • the URLLC module 608 may be configured to switch between the coherent modulation mode and the non-coherent modulation mode based on various factors. In some aspects the URLLC module 608 may be configured to switch between the non-coherent modulation mode and the coherent modulation mode for the URLLC transmission and/or the URLLC reception based on a channel measurement, a MCS, a SNR, an allocation size, and/or a spectral efficiency. In some aspects, for the URLLC transmission, the URLLC module 608 may be configured to switch to the coherent modulation mode from the non-coherent modulation mode based on an OFDM waveform associated with the first URLLC signal.
  • the URLLC module 608 may be configured to switch to the non-coherent modulation mode from the coherent modulation mode based on an SC-OFDM waveform associated with the second URLLC signal.
  • the URLLC module 608 may be configured to switch to the coherent modulation mode from the non-coherent modulation mode based on an OFDM waveform associated with the third URLLC signal.
  • the URLLC module 608 may be configured to switch to the non coherent modulation mode from the coherent modulation mode based on an SC-OFDM waveform associated with the fourth URLLC signal.
  • the transceiver 610 may include a modem subsystem 612 and an RF unit 614.
  • the transceiver 610 can be configured to communicate bi-directionally with other devices, such as the BSs 105.
  • the modem subsystem 612 may be configured to modulate and/or encode the data from the memory 604 and/or the URLLC module 608 according to a modulation and coding scheme (MCS), e.g., a low-density parity check (LDPC) coding scheme, a turbo coding scheme, a convolutional coding scheme, a digital beamforming scheme, etc.
  • MCS modulation and coding scheme
  • LDPC low-density parity check
  • the RF unit 614 may be configured to process (e.g., perform analog to digital conversion or digital to analog conversion, etc.) modulated/encoded data (e.g., PUSCH signal, PUCCH signal, HARQ ACK-NACK, UL URLLC data) from the modem subsystem 612 (on outbound transmissions) or of transmissions originating from another source such as a UE 115 or a BS 105.
  • modulated/encoded data e.g., PUSCH signal, PUCCH signal, HARQ ACK-NACK, UL URLLC data
  • the RF unit 614 may be further configured to perform analog beamforming in conjunction with the digital beamforming.
  • the modem subsystem 612 and the RF unit 614 may be separate devices that are coupled together at the UE 115 to enable the UE 115 to communicate with other devices.
  • the RF unit 614 may provide modulated and/or processed data, e.g. data packets (or, more generally, data messages that may contain one or more data packets and other information), to the antennas 616 for transmission to one or more other devices.
  • the antennas 616 may further receive data messages transmitted from other devices.
  • the antennas 616 may provide the received data messages for processing and/or demodulation at the transceiver 610.
  • the transceiver 610 may provide the demodulated and decoded data (e.g., PDSCH signal, PDCCH, DL URLLC data, scheduling grants) to the URLLC module 608 for processing.
  • the antennas 616 may include multiple antennas of similar or different designs in order to sustain multiple transmission links.
  • the RF unit 614 may configure the antennas 616.
  • the UE 600 can include multiple transceivers 610 implementing different RATs (e.g., NR and LTE).
  • the UE 600 can include a single transceiver 610 implementing multiple RATs (e.g., NR and LTE).
  • the transceiver 610 can include various components, where different combinations of components can implement different RATs.
  • FIG. 7A is discussed in relation to FIGS. 7B and 7C to illustrate dynamic switching between coherent modulation and non-coherent modulation for URLLC.
  • FIG. 7A illustrates a URLLC communication method 700 with dynamic switching between coherent modulation and non-coherent modulation according to some aspects of the present disclosure.
  • the method 700 may be employed by a wireless communication device, such as the BSs 105 and UEs such as the UEs 115 in a network such as the network 100, for communications.
  • a wireless communication device such as the UEs 115 and/or 600 may utilize one or more components, such as the processor 602, the memory 604, the URLLC module 608, the transceiver 610, the modem 612, and the one or more antennas 616, to execute the steps of method 1000.
  • a wireless communication device such as the BSs 105 and/or 500 may utilize one or more components, such as the processor 502, the memory 504, the URLLC module 508, the transceiver 510, the modem 512, and the one or more antennas 516, to execute the steps of method 1000.
  • a transmitter such as the transmitters 706, 707, and/or 906 may implement the method 1000.
  • the wireless communication device performs switching between a coherent modulation mode and a non-coherent modulation mode for URLLC transmissions.
  • the wireless communication device may transmit one or more DMRSs along with URLLC information for a URLLC transmission.
  • the DMRSs enable a receiver to perform channel estimation and coherent demodulation for data decoding.
  • a coherent URLLC transmitter 707 and a coherent URLLC receiver 709 are shown in FIG. 7C.
  • the wireless communication device may transmit a URLLC transmission without any DMRSs, for example, by modulating URLLC information onto phase differences and/or amplitude differences across adjacent subcarriers within an OFDM symbol.
  • the transmission of the A non-coherent receiver may decode the URLLC data without performing any channel estimation as the URLLC information data is carried across phase differences and/or amplitude differences across adjacent subcarriers within an OFDM symbol and not in absolute phases and/or absolute amplitudes of the subcarriers.
  • the non-coherent modulation mode can exclude DMRSs from a URLLC transmission, allowing more resources for URLLC data transmission.
  • certain frequency subcarriers within certain symbols may be configured as pilot resources where pilot symbols or DMRS may be transmitted. Since there is no DMRS in URLLC transmission with non-coherent modulation, the pilot resource can be used for transmitting data.
  • non-coherent modulation can increase data throughput. Additionally, the exclusion of channel estimation at the non-coherent receiver can reduce processing complexity and memory utilization.
  • a non-coherent URLLC transmitter 706 and a non-coherent URLLC receiver 708 are shown in FIG. 7B.
  • the coherent modulation mode and the non-coherent modulation mode may each provide different or various benefits under different conditions.
  • the coherent modulation mode may have a higher resource overhead than the non-coherent modulation mode due to DMRSs being transmitted along with URLLC information data.
  • the DMRS overhead can be significant for SC-OFDM waveform (e.g., up to about 50%).
  • the wireless communication device may switch between the coherent modulation mode and the non-coherent modulation mode based on a URLLC transmission signal waveform.
  • the wireless communication device may switch from the coherent modulation mode to the non-coherent modulation mode for a URLLC transmission that utilizes an SC-OFDM waveform.
  • the wireless communication device may switch from the non-coherent modulation mode to the coherent modulation mode for a URLLC transmission that utilizes an OFDM waveform.
  • the DMRS overhead may be dependent on the allocation size. For example, the DMRS overhead may be higher for a smaller allocation size. Accordingly, the wireless communication device may switch between the coherent modulation mode and the non-coherent modulation mode based on an allocation size. Further, the wireless communication device may switch between the coherent modulation mode and the non-coherent modulation mode based on a spectral efficiency target.
  • the coherent modulation mode and the non-coherent modulation mode may have different performances under different channel conditions. For example, when the channel condition is good (e.g., high SNR), the non-coherent modulation mode may have a sufficiently good performance or similar performance as the coherent modulation node. However, when the channel condition is poor (e.g., low SNR), the coherent modulation mode may provide a better performance than the non-coherent modulation node. On the other hand, if the channel is experiencing a high mobility, the performance of the coherent modulation mode may be dependent on the DMRS density in time, whereas the performance of the non-coherent modulation mode does not have the same dependency.
  • the channel condition e.g., high SNR
  • the coherent modulation mode may provide a better performance than the non-coherent modulation node.
  • the performance of the coherent modulation mode may be dependent on the DMRS density in time, whereas the performance of the non-coherent modulation mode does not have the same dependency.
  • the wireless communication device can determine the channel conditions based on channel measurements.
  • the wireless communication device when the wireless communication device is a BS (e.g., the BSs 105 and/or 500), the BS can configure a UE (e.g., the UEs 115 and/or 600) to transmit a sounding reference signal (SRS) and determine a channel condition based on the SRS received from the UE.
  • the wireless communication device may switch between the coherent modulation mode and the non-coherent modulation mode based on a channel measurement, a channel condition, and/or an SNR.
  • SRS sounding reference signal
  • the wireless communication device may also switch between the coherent modulation mode and the non-coherent modulation mode based on a MCS. For instance, a higher MCS order is usually selected for a channel condition with a higher SNR. For different SNR conditions, different combinations for modulation mode (e.g., non-coherent modulation or coherent modulation mode) and a MCS may be selected. Thus, depending on the channel SNR and the selected MCS order, the wireless communication device may determine whether the coherent modulation mode or the non-coherent modulation mode may provide a better performance.
  • a MCS For instance, a higher MCS order is usually selected for a channel condition with a higher SNR. For different SNR conditions, different combinations for modulation mode (e.g., non-coherent modulation or coherent modulation mode) and a MCS may be selected. Thus, depending on the channel SNR and the selected MCS order, the wireless communication device may determine whether the coherent modulation mode or the non-coherent modulation mode may provide a better performance.
  • the wireless communication device may switch between the coherent modulation mode and the non-coherent modulation mode for URLLC based on any suitable combination of a transmission signal waveform, an allocation size, an allocation duration, a channel measurement, a channel condition, a mobility speed, a channel delay spread, an SNR, a MCS order, and/or a spectral efficiency target.
  • the wireless communication device performs coherent URLLC transmission based on the coherent modulation mode. For instance, the wireless communication device transmits a first URLLC signal including coherently modulated first URLLC information data, for example, using the coherent transmitter 707.
  • a corresponding receiver may decode the first URLLC information data based on channel estimation and coherent demodulation, for example, using the coherent receiver 709.
  • the wireless communication device performs non-coherent URLLC transmission based on the non-coherent modulation mode. For instance, the wireless communication device transmits a second URLLC signal including non-coherently modulated second URLLC information data using the non-coherent transmitter 706. A corresponding receiver may decode the second URLLC information data without performing channel estimation, for example, using the coherent receiver 708.
  • the wireless communication device may perform the switching between the coherent modulation mode and the non-coherent modulation mode based on receiving an modulation mode switch instruction.
  • the wireless communication device may be a UE (e.g., the UEs 115 and/or 600), and may receive the modulation mode switch instruction from a serving BS (e.g., the BSs 105 and/or 500).
  • the mode switch instruction can be applied to a URLLC transmission or a URLLC reception.
  • the BS may signal the mode switch instruction via any type of signaling, such as PDCCH signaling, MAC signaling, and/or RRC signaling,
  • FIG. 7B illustrates in a wireless communication network 714 including a non-coherent URLLC transmitter 706 and a non-coherent URLLC receiver 708 in to some aspects of the present disclosure.
  • the network 714 may correspond to a portion of the network 100.
  • the transmitter 706 may correspond to a transmitter at a BS (e.g., the BSs 105 and/or 600) and the receiver 708 may correspond to a receiver at a UE (e.g., the UEs 115 and/or 500).
  • the transmitter 706 may correspond to a transmitter at a UE and the receiver 708 may correspond to a receiver at a BS.
  • the transmitter 706 is configured to non- coherently modulate URLLC data for transmissions to eliminate the need for transmitting a DMRS along with URLLC data in a URLLC transmission.
  • URLLC data information can be carried in phased differences and/or amplitude differences across adjacent or consecutive frequency subcarriers (e.g., the frequency subcarriers 204) within an OFDM symbol (e.g., the OFDM symbol 206) or across adjacent or consecutive samples within an OFDM symbol.
  • the application of non- coherent modulation at the transmitter 706 allows the receiver 708 to recover URLLC data using non-coherent demodulation or detection instead of based on channel estimation.
  • the transmitter 706 can select between OFDM waveform transmission and SC-OFDM waveform transmission.
  • the receiver 708 can support data decoding from OFDM waveform signals and SC-OFDM waveform signals.
  • the transmitter 706 includes a channel encoding block 710, a bits-to-symbol mapping block 720, a differential encoding block 730, a discrete Fourier transform (DFT) block 734, and an inverse fast Fourier transform (IFFT) and cyclic-prefix (CP) addition block 740, which may be implemented via hardware, software, or combinations thereof.
  • DFT discrete Fourier transform
  • IFFT inverse fast Fourier transform
  • CP cyclic-prefix
  • the receiver 708 includes a CP removal and fast Fourier transform (FFT) block 750, a frequency domain-equalizer (FD-EQ) and inverse DFT (IDFT) block 754, an IDFT and time-domain equalizer (TD-EQ) block 756, a differential decoding block 760, and a channel decoding block 770, which may be implemented via hardware, software, or combinations thereof.
  • FFT CP removal and fast Fourier transform
  • FD-EQ frequency domain-equalizer
  • IDFT inverse DFT
  • TD-EQ time-domain equalizer
  • differential decoding block 760 includes a differential decoding block 760, and a channel decoding block 770, which may be implemented via hardware, software, or combinations thereof.
  • one or more of the blocks 710, 720, 730, 734, and 740 of the transmitter 706 can be implemented by the transceiver 510 and/or the URLLC module 508 of the BS 500 shown in FIG.
  • one or more of the blocks 750, 754, 756, 760, 770 of the receiver 708 can be implemented by the transceiver 610 and/or the URLLC module 608 of the UE 600 shown in FIG. 6.
  • one or more of the blocks 710, 720, 730, 734, and 740 of the transmitter 706 can be implemented by the transceiver 610 and/or the URLLC module 608 of the UE 600 shown in FIG. 6 and one or more of the blocks 750, 754, 756, 760, 770 of the receiver 708 can be implemented by the transceiver 510 and/or the URLLC module 508 of the BS 500 shown in FIG. 5.
  • the channel encoding block 710 is configured to receive a stream of URLLC information bits 702.
  • the URLLC information data bits 702 may be associated with a URLLC application or a URLLC service (e.g., industrial automation, self-driving cars, drones, robots, power grid systems, sensors, smart meters, alarm systems, healthcare monitoring, etc.).
  • the channel encoding block 710 is further configured to perform channel encoding on the stream of URLLC information bits 702 to output channel coded bits 712.
  • Some examples for channel coding may include a convolutional code, a turbo code, a low-density parity check (LDPC) code, and/or a polar code.
  • LDPC low-density parity check
  • the bits-to-symbol mapping block 720 is configured to perform bits-to-symbol mapping on the channel coded bits 712 to output a sequence of modulation symbols 722, denoted as S k .
  • Some examples of bits-to-symbol mapping schemes may include quadrature phase- shift-keying (QPSK),
  • the bits-to-symbol mapping block 720 may be configured to perform the bits-to-symbol mapping using an 8PSK modulation scheme as shown by the 8PSK constellation 724.
  • the 8PSK constellation 724 shows information is transmitted as one of 8 symbols or constellation points (shown by the solid circles), each representing 3 bits of data. Each symbol or constellation point is represented by a different phase shift.
  • the 8PSK constellation 724 may represent binary bits 111, 110, 010, Oil, 001, 000, 100, and 101 by a phase- shift of 0 degree (°), 45°, 90°, 135°, 180°, 225°, 270°, and 315°, respectively.
  • the bits-to-symbol mapping block 720 may output a sequence of modulation symbols 722, for example, each corresponding to one of the constellation points (e.g., a complex in-phase-quadrature-phase (I-Q) values) in the 8PSK constellation 724.
  • the bits-to-symbol mapping block 720 may be configured to perform the bits-to-symbol mapping using an 8APSK modulation scheme, where information is transmitted as one of 8 constellation points each represented by a different phase shift and a different amplitude.
  • the differential encoding block 730 is configured to perform differential encoding on the modulation symbols 722 to generate a differential encoded signal 732 in accordance with Equation (1):
  • K k n + 1 represents an output at a current frequency subcarrier index (k+1) in an OFDM symbol index n (for OFDM waveform transmission) or a current sample index (k+1) in the OFDM symbol index n (for SC-OFDM waveform transmission )
  • Y represents an output at a previous frequency subcarrier index k in the OFDM symbol index n (for OFDM waveform transmission) or a previous sample index k in the OFDM symbol index n (for SC-OFDM waveform transmission )
  • S k represents an information symbol or modulation symbol 722.
  • the index k may vary from 0 to N-l, where N may correspond to an FFT size or an OFDM symbol size.
  • the differential encoded signal 732 is a sequence of frequency values each corresponding to a frequency subcarrier in the OFDM symbol for OFDM waveform transmission or a sequence of time values each corresponding to a sample point in the OFDM symbol for SF-OFDM waveform transmission.
  • the differential encoding block 730 modulates the URFFC information bits onto at least one of phase differences or amplitude differences across adjacent frequency subcarriers within each OFDM symbol. For example, if the modulation scheme is 8PSK, the differential encoding block 730 modulates the URLLC information bits onto phase differences across adjacent frequency subcarriers (for OFDM waveform transmission) or time samples (for SC-OFDM waveform transmission) within an OFDM symbol.
  • the differential encoding block 730 modulates the URLLC information bits onto amplitude and phase differences across adjacent frequency subcarriers (for OFDM waveform transmission) or time samples (for SC- OFDM waveform transmission) within each OFDM symbol.
  • the differential encoding allows the receiver 708 to perform non-coherent detection/demodulation (e.g., different decoding) as will be discussed more fully below.
  • the transmitter 706 can select between an OFDM waveform transmission or an SC-OFDM waveform transmission. Depending on whether the transmission signal waveform to be used for transmitting the URLLC information bits 702, the transmitter 706 may determine whether to apply the DFT block 734.
  • the differential encoded signal 732 is a time domain signal and is processed by the DFT block 734 as shown by the circle symbol with the numeral 1.
  • the differential encoded signal 732 a frequency domain signal and is sent directly to the IFFT and CP addition block 740 as shown by the circle symbol with the numeral 2.
  • the DFT block 734 is configured to perform a DFT (e.g., an M-point DFT) on the differential encoded signal 732 to provide an SC-OFDM waveform for transmission.
  • the DFT block 734 produces a frequency domain signal 736.
  • the IFFT and CP addition block 740 is configured to perform an IFFT (e.g., an N-point IFFT) on the signal 732 (for OFDM waveform transmission) or the signal 736 (for SC-OFDM waveform transmission) to produce a time domain signal and prepend a copy of an end portion of the time domain signal to the beginning of the time domain signal to produce an output signal 742 for transmission to a channel.
  • an IFFT e.g., an N-point IFFT
  • the N-point IFFT may have a different size than the M-point DFT of the DFT block 734.
  • the output signal 742 may include one more OFDM symbols (e.g., the symbols 206).
  • the differential encoding block 730, the DFT block 734, and the IFFT and CP addition block 740 may process the modulation symbols 722 on a block-by-block basis to generate an OFDM symbol for each block.
  • the transmitter 706 may further include an RF frontend (e.g., the RF units 514 and/or 614) that converts the output signal 742 (e.g., a baseband signal) to an RF signal for transmission over a wireless communication channel or link.
  • the output signal 742 may an OFDM waveform or an SC-OFDM waveform depending on whether the transmitter 706 applies the DFT block 734 during the generation of the signal 742.
  • the receiver 708 may include an RF frontend (e.g., the RF units 514 and/or 614) that receives a signal (e.g., an RF signal) from the wireless communication channel and converts the RF signal to a baseband signal 704.
  • the CP removal and FFT block 750 is configured to remove a CP from the signal 704 and perform an FFT on the CP-removed signal to produce a frequency domain signal 752.
  • the frequency subcarrier index k may vary from 0 to N-l, where N may correspond to the IFFT size.
  • the receiver 708 may determine whether to send the frequency domain signal 752 to the FD-EQ and IDFT block 754, the IDFT and TD-EQ block 756, or directly to the different decoding block 760. If the received signal 704 has an SC-OFDM waveform, the receiver 708 may perform a coarse equalization, for example, based on a coarse channel estimation and noise estimation. In some aspects, the receiver 708 may perform the coarse equalization in a frequency domain. For instance, the receiver 708 may send the frequency domain signal 752 to the FD-EQ and IDFT block 754 as shown by the circle with the numeral 1.
  • the FD-EQ and IDFT block 754 is configured to perform a frequency domain equalization, followed by an IDFT.
  • the frequency domain equalization can be based on a channel estimate determined from reference signals. For instance, if the receiver 708 is at a BS (e.g., the BSs 105 and/or 500) and the transmitter 706 is at a UE (e.g., the UEs 115 and/or 600), the BS can configure the UE to transmit SRSs periodically and compute a channel estimate (e.g., channel response phase and/or amplitude) based on the received SRS.
  • a channel estimate e.g., channel response phase and/or amplitude
  • the receiver 708 may perform the coarse equalization in a time domain.
  • the receiver 708 may send the frequency domain signal 752 to the IDFT and TD-EQ block 756 as shown by the circle symbol with the numeral 2.
  • the IDFT and TD-EQ block 756 is configured to perform an IDFT, followed by a time domain equalization.
  • the time domain equalization can be based on various algorithms, such as a constant modulus algorithm (CMA).
  • the CMA can remove inter symbol interference, but may not provide channel phase information. Since the receiver 708 applies differential decoding, the unknown phase may not impact the performance. [0130] If the received signal 704 has an OFDM waveform, the receiver 708 may send the frequency domain signal 752 directly to the differential decoding block 760 as shown by the circle symbol with the numeral 3.
  • the differential decoding block 760 is configured to perform differential decoding on the frequency domain signal 752, the FD-EQ and IDFT -processed signal 755, or the IDFT and TD-EQ- processed signal 757 to recover the originally information symbol or modulation symbol 722.
  • the differential decoding block 760 may extract differential phase information and/or amplitude differential information from the frequency domain signal 752. For instance, if the transmitter 706 uses an 8PSK scheme, the differential decoding block 760 may extract differential phase information from the signal 752, 755, or 757. If the transmitter 706 uses an APSK scheme, the differential decoding block 760 may extract differential phase and amplitude information from the signal 752, 755, or 757.
  • the differential decoding block 760 may perform differential decoding or non-coherent detection to extract differential phase information in accordance with Equation (3): where r k+1 represents a received frequency value at a current frequency subcarrier index (k+1) in a current OFDM symbol (for OFDM waveform transmission) or a received time value at a current time index (k+1) in a current OFDM symbol (for SC-OFDM waveform transmission), r k represents a received frequency value at a previous or adjacent frequency subcarrier index k in a current OFDM symbol (for OFDM waveform transmission) or a received time value at a previous or adjacent time index k in a current OFDM symbol (for SC-OFDM waveform transmission), S k+1 ' represents a decoded information or modulation symbol, and * represents a conjugation.
  • Equation (3) where r k+1 represents a received frequency value at a current frequency subcarrier index (k+1) in a current OFDM symbol (for OFDM waveform transmission) or a received time
  • the differential decoding block 760 may perform the differential decoding or non-coherent detection to extract differential phase and amplitude information in accordance with Equation (4):
  • the differential decoding block 760 may output a sequence of decoded symbols 762 by multiplying a first value (e.g., r +1) of the signal 752 at a first frequency subcarrier (or a first time index) by a conjugation of a second value (e.g., r k ) of the signal 752 at a second frequency subcarrier (or a second time index) previous or neighboring to the first frequency subcarrier (or the first time index) when differential phase encoding (e.g., 8PSK) is used at the transmitter 706.
  • a first value e.g., r +1
  • a second value e.g., r k
  • the differential decoding block 760 may output a sequence of decoded symbols 762 by dividing a first value (e.g., r k+1 ) of the signal 752 at a first frequency subcarrier (or a first time index) by a second value (e.g., r k ) of the signal 752 at a second frequency subcarrier (or a second time index) previous or neighboring to the first frequency subcarrier (or the first time index) when differential amplitude and phase encoding (e.g., APSK) is used at the transmitter 706.
  • a first value e.g., r k+1
  • a second value e.g., r k
  • the receiver 708 may maintain a two- modulation symbol buffer for the operations of Equation (3) or (4) instead of a buffer of a few K bytes (to buffer multiple OFDM symbols of an incoming signal) as in a coherent receiver where channel estimation is performed.
  • the received signal 704 may include multiple OFDM symbols.
  • the CP removal and FFT block 750, the FD-EQ and ID FT block 754, the IDFT and TD- EQ block 756, and the differential decoding block 760 may process the received signal on a per OFDM symbol period basis and provide the decoded symbols 762 from each OFDM symbol period to the channel decoding block 770.
  • the channel decoding block 770 is configured to perform channel decoding on the decoded symbols 762 to extract URFFC data bits 772 carried by the received signal 704.
  • the channel decoding block 770 may perform the decoding based on the modulation coding scheme used at the transmitter 706. For instance, when the transmitter 706 utilizes an 8PSK modulation and a FDPC code, channel decoding block 770 may convert the decoded symbols 762 to bits and perform FDPC decoding to obtain the URFFC data bits 772.
  • the decoded URFFC data bits 772 may correspond to the URFFC data information bits 702 transmitted by the transmitter 706.
  • the decoding of the information symbols 762 is independent or insensitive to the absolute channel signal amplitudes and/or phases, each information symbol 762 is carried in the phase difference and/or amplitude differences across two consecutive subcarriers or two consecutive time points.
  • the use of non-coherent modulation for URFFC can provide highly robust performance against channel conditions.
  • the non-coherent URFFC can operate based on a coherency bandwidth of two subcarriers and may support high speeds as no coherency between OFDM symbols is required for channel estimation.
  • the transmitter 706 can utilize a lower code rate (e.g., up to about 100 %) by utilizing resources that are allocated for DMRS (when using DMRS) for URFFC data transmission, where the DMRS resources can be used to carry channel bits.
  • DMRS resources can be used to carry channel bits.
  • some networks may utilize SC-OFDM for UF URFFC, where PUSCH signal cannot be frequency multiplexed with DMRS(s), and therefore the entire DMRS symbol (e.g., the symbol 206) may be used for data transmission.
  • the use of coherent modulation for URLLC can enable receptions of low-SNR signals, allowing coverage extension.
  • the performance can be improved by up to about 4 decibels (dBs) in mid-SNR operations (e.g., between about 10 dB to about 14 dB).
  • eliminating channel estimation at the receiver 708 can allow the receiver 708 to process an incoming data signal (e.g., PDSCH signal or PUSCH signal) as soon as the receiver 708 receives the signal rather than waiting on channel estimation to be completed. In other words, there is no need to postpone the processing of the incoming data signal for channel estimation to perform averaging over time. Accordingly, the use of non-coherent URLLC detection can reduce implementation complexity and memory usage at the receiver 708 compared to the use of coherent demodulation.
  • an incoming data signal e.g., PDSCH signal or PUSCH signal
  • FIG. 7C illustrates in a wireless communication network 718 including a coherent URLLC transmitter 707 and a coherent URLLC receiver 709 in to some aspects of the present disclosure.
  • the network 718 may correspond to a portion of the network 100.
  • the transmitter 707 may correspond to a transmitter at a BS (e.g., the BSs 105 and/or 600) and the receiver 709 may correspond to a receiver at a UE (e.g., the UEs 115 and/or 500).
  • the transmitter 707 may correspond to a transmitter at a UE and the receiver 709 may correspond to a receiver at a BS.
  • the transmitter 707 is configured to coherently modulate URLLC data for transmissions and transmit one or more DMRSs (e.g., the DMRSs 410) along with the URLLC data.
  • the DMRSs can facilitate channel estimation at the receiver 709. Additionally, similar to the transmitter 706, the transmitter 707 can select between OFDM waveform transmission and SC-OFDM waveform transmission.
  • the receiver 709 can support channel estimation and data decoding from OFDM waveform signals and SC-OFDM waveform signals.
  • the transmitter 707 includes features similar to transmitter 706 in many respects.
  • the transmitter 707 includes the same channel encoding block 710, bits-to- symbol mapping block 720, DFT block 734, and IFFT and CP addition block 740 as the transmitter 706.
  • the receiver 709 includes features similar to receiver 708 in many respects.
  • the receiver 709 includes the same CP removal and FFT block 750 and the channel decoding block 770 as the receiver 708. Accordingly, for sake of brevity, details of those blocks will not be repeated here.
  • the transmitter 707 further includes a subcarrier mapper block 780, which may be implemented via hardware, software, or combinations thereof.
  • the receiver 709 further includes a subcarrier de-mapper and equalizer block 790, an IDFT block 793, and a symbol de-mapper block 796, which may be implemented via hardware, software, or combinations thereof.
  • one or more of the blocks 710, 720, 780, 734, and 740 of the transmitter 707 can be implemented by the transceiver 510 and/or the URLLC module 508 of the BS 500 shown in FIG.
  • one or more of the blocks 750, 790, 793, 796, 770 of the receiver can be implemented by the transceiver 610 and/or the URLLC module 608 of the UE 600 shown in FIG. 6.
  • one or more of the blocks 710, 720, 780, 734, and 740 of the transmitter 707 can be implemented by the transceiver 610 and/or the URLLC module 608 of the UE 600 shown in FIG. 6 and one or more of the blocks 750, 790, 793, 796, 770 of the receiver can be implemented by the transceiver 510 and/or the URLLC module 508 of the BS 500 shown in FIG. 5.
  • the subcarrier mapper block 780 is configured to map the sequence of modulation symbols 722 to OFDM subcarriers (e.g., the subcarriers 204) within an OFDM symbol for OFDM waveform transmission or to time sample points within an OFDM symbol for SC-OFDM waveform transmission.
  • the modulation symbols 722 may be 8PSK symbols, quadrature-amplitude-modulation (QAM) symbols, 16-QAM symbols, 64-QAM symbols, and/or the like.
  • the transmitter 707 may determine the MCS based on a channel condition as discussed above.
  • the subcarrier mapper block 780 is further configured to include pilot symbols (e.g., DMRSs) to predetermined subcarriers in predetermined OFDM symbols (e.g., as shown in FIG. 4A and 4B).
  • the subcarrier mapper block 780 outputs a signal 782 including the modulation symbols 722 and the DMRSs. Similar to the transmitter 706, if the transmitter 707 selects an SC-OFDM waveform for transmission, the transmitter 707 may send the signal 782 to the DFT block 734 as shown by the circle symbol with the numeral 1 and then to the IFFT and CP addition block 740.
  • the transmitter 707 may send the signal 782 directly to the IFFT and CP addition block 740.
  • the signal 786 output by the IFFT and CP addition block 740 may include an SC- OFDM waveform or an OFDM waveform depending on the transmitter 706’s selection.
  • the transmitter 707 may include an RF frontend (e.g., the RF units 514 and/or 614) that converts the output signal 786 (e.g., a baseband signal) to an RF signal for transmission over a wireless communication channel or link.
  • the receiver 709 may include an RF frontend (e.g., the RF units 514 and/or 614) that receives a signal (e.g., an RF signal) from the wireless communication channel and converts the RF signal to a baseband signal 705.
  • the CP removal and FFT block 750 is configured to remove a CP from the signal 704 and perform an FFT on the CP-removed signal to produce a frequency domain signal 753.
  • the subcarrier demapper and equalizer block 790 is configured to perform subcarrier demapping to obtain the pilot symbols (e.g., the DMRSs) in the frequency domain signal 753 and perform channel estimation and/or noise estimation based on the DMRSs.
  • the subcarrier demapper and equalizer block 790 is further configured to perform equalization/demodulation on the frequency domain signal 753 based on the channel and/or noise estimates. Similar to the receiver 708, if the received signal 705 has an SC-OFDM waveform, the receiver 709 may send the demodulated signal 792 to the IDFT block 793 as shown by the circle symbol with the numeral 1. Alternatively, if the received signal 705 has an OFDM waveform, the transmitter 707 may send the demodulated signal 792 directly to symbol demapper block 796.
  • the IDFT block 793 is configured to perform an IDFT on the equalized signal 792 to output a demodulated SC-OFDM signal 792.
  • the symbol demapper block 796 is configured to convert the demodulated symbols in the demodulated signal 792 or 794 to bits based on a modulation scheme (e.g., 8PSK, 16-QAM, 64-QAM) used in at the transmitter 707.
  • the channel decoding block 770 may perform channel decoding (e.g., LDPC, polar decoding) to recover the URLLC information bits 799 carried by the received signal 705.
  • a wireless communication device may include the non-coherent transmitter 706 and the coherent transmitter 707 and may switch between using the non-coherent transmitter 706 for non-coherent URLLC transmission and the coherent transmitter 707 for coherent URLLC transmission.
  • the wireless communication device may configure the non-coherent transmitter 706 and the coherent transmitter 707 as separate transmitter chains as shown or as a single transmitter chain with switching between coherent and non-coherent modulation.
  • the wireless communication device may include the non-coherent receiver 708 and the coherent receiver 709 and may switch between using the non-coherent receiver 708 and the coherent receiver 709 depending on whether a received signal was generated using coherent modulation or non-coherent modulation.
  • the wireless communication device may configure the non-coherent receiver 708 and the coherent receiver 709 as separate receiver chains as shown or as a single receiver chain with switching between coherent detection and non-coherent detection.
  • FIGS. 8A and 8B illustrates non-coherent URLLC transmissions.
  • FIG. 8A illustrates a non coherent DL URLLC 800 according to some aspects of the present disclosure.
  • the DL URLLC 800 may correspond to a DL URLLC between a BS 105 and a UE 115 in the network 100 when the BS 105 performs non-coherent modulation on DL URLLC data using a transmitter similar to the transmitter 706 discussed above with reference to FIG. 7B.
  • FIG. 8B illustrates a non-coherent UL URLLC 860 according to some aspects of the present disclosure.
  • the UL URLLC 860 may correspond to a UL URLLC between a BS 105 and a UE 115 in the network 100 when the UE 115 performs non-coherent modulation on UL URLLC data using a transmitter similar to the transmitter discussed above with reference to LIG. 7B.
  • the x-axes represent time in units of OLDM symbols
  • the y-axes represent frequency in some arbitrary units.
  • the DL URLLC 800 and the UL URLLC 860 may utilize the radio frame structure and/or mini-slot structure discussed above with reference to LIGS. 2 and 3.
  • a BS may transmit a PDCCH signal 420 to schedule a UE (e.g., the UEs 115) for a DL URLLC.
  • the schedule may include symbols 206 indexed 1 to 5.
  • the BS may apply non-coherent modulation to DL URLLC data (e.g., the URLLC data information bits 702) and eliminate the inclusion of a DMRS in a URLLC transmission.
  • the BS transmits a PDSCH signal 430 at the symbols 206 indexed 1-5.
  • the PDSCH signal 430 includes the non-coherently modulated DL URLLC data.
  • the BS eliminates the transmission of DMRSs at symbols 206 indexed 1 and 5 and utilizes the symbols 206 indexed 1 and 5 for PDSCH signal 430 transmission.
  • a BS may transmit a PDCCH signal 420 (at symbol 206 indexed 0) to schedule a UE (e.g., the UEs 115) for a UL URLLC.
  • the schedule may include symbols 206 indexed 9 and 10.
  • the UE may apply non-coherent modulation to UL URLLC data (e.g., the URLLC data information bits 702) and eliminate the inclusion of DMRS in a URLLC transmission.
  • the UE transmits a PUSCH signal 450 at the symbols 206 indexed 9 and 10.
  • the PUSCH signal 450 includes the non-coherently modulated UL URLLC data.
  • the UE eliminates the transmission of DMRS at symbol 206 indexed 9 and utilizes the symbol 206 indexed 9 for PUSCH signal 450 transmission.
  • LIG. 9 illustrates a wireless communication network 900 including a non-coherent URLLC transmitter 906 and a non-coherent URLLC receiver 908 according to some aspects of the present disclosure.
  • the network 900 may correspond to a portion of the network 100 and may be substantially similar to the network 714.
  • the network 900 includes a transmitter 906 and a receiver 908.
  • the transmitter 906 may correspond to a transmitter at a BS (e.g., the BSs 105 and/or 500) and the receiver 908 may correspond to a receiver at a UE (e.g., the UEs 115 and/or 600).
  • the transmitter 906 may correspond to a transmitter at a UE and the receiver 908 may correspond to a receiver at a BS.
  • the transmitter 906 and the receiver 908 may be substantially similar to the transmitter 706 and the receiver 708, respectively.
  • the transmitter 706 is configured to non-coherently modulate URLLC data for transmissions to eliminate the need for DMRS.
  • the receiver 908 is configured to perform non-coherent detection to recover URLLC data using non-coherent detection instead of based on channel estimation.
  • the transmitter 906 may be further configured to apply set partitioning techniques to encode URLLC information data.
  • Set partitioning may refer to successive partitioning of an MPSK signal or constellation set into subsets with increasing minimum Euclidean distances between constellation signal points of these subsets. Accordingly, the receiver 908 may further be configured to perform channel decoding according to the set partitioning.
  • the transmitter 906 includes a set partitioning block 905, a channel encoding block 910, a bits-to-symbol mapping block 920, a differential encoding block 930, and an IFFT and CP addition block 940.
  • the channel encoding block 910, the bits-to-symbol mapping block 920, the differential encoding block 930, and the IFFT and CP addition block 940 may be implemented via hardware, software, or combinations thereof.
  • the receiver 908 includes a CP removal and FFT block 950, a differential decoding block 960, a channel decoding block 970 for least significant bit (FSB), and a channel decoding block 980 for most significant bits (MSB).
  • the set partitioning block 905, CP removal and FFT block 950, the differential decoding block 960, and the channel decoding blocks 970 and 980 may be implemented via hardware, software, or combinations thereof.
  • one or more of the blocks 905, 910, 920, 930, 940, 950, 960, 970, and/or 980 can be implemented by the transceiver 510 and/or the URFFC module 508 of the BS 500 shown in FIG. 5.
  • one or more of the blocks 905, 910, 920, 930, 940, 950, 960, 970, and/or 980 can be implemented by the transceiver 610 and/or the URFFC module 608 of the UE 600 shown in FIG. 6.
  • the transmitter 906 and the receiver 908 include features similar to the transmitter 706 and the receiver 708 of FIG. 7B in many respects.
  • blocks 930, 940, 950, and 960 are similar to blocks 730, 740, 750, 760, respectively. Accordingly, for sake of brevity, details of those steps will not be repeated here.
  • the set partitioning block 905 is configured to receive a stream of URFFC information bits 902 similar to the URFFC information bits 702.
  • the set partitioning block 905 is configured to perform set partitioning on the URFFC information bits 902. For instance, set partitioning block 905 may partition the URFFC information bits 902 into two bit sequences, a bit sequence 906a, denoted as B k l , and a bit sequence 906b, denoted as B k 2 ,
  • the channel encoding block 910 is configured to separately perform channel encoding on the bit sequence 906a and the bit sequence 906b into a coded bit sequence 912a, denoted as C k l , and a coded bit sequence 912b, denoted as C k 2 , respectively.
  • the channel encoding block 910 is configured to apply different coding rate to the bit sequence 906a and the bit sequence 906b. For instance, the channel encoding block 910 can apply a stronger code or a more reliable coding rate to the bit sequence 906a.
  • a constellation set is partitioned into subsets.
  • set partitioning may partition an 8PSK constellation set as shown in the constellation 924.
  • the 8PSK constellation set is partitioned into two sets with alternating constellation points, a first subset of the constellation points is shown by the solid circles and a second subset of the constellation points is are shown by the empty-filled circles.
  • the first subset corresponds to constellation points with least significant bits (LBSs) of 1 and the second subset corresponds to constellation points with LSBs of 0.
  • LBSs least significant bits
  • each of the first subset and the second subset may be similar to a QPSK constellation set.
  • the bits-to-symbol mapping block 920 is configured to map the coded bit sequence 912a to the first subset of the 8PSK constellation points and the map the coded bit sequence 912b to the second subset of 8PSK constellation points.
  • the bits-to-symbol mapping block 920 may output a sequence of information symbols or modulation symbols 922.
  • the differential encoding block 930 and the IFFT and CP addition block 940 may operate on the modulation symbols 922 to produce a signal 942 for transmission over a wireless communication link or channel.
  • the CP removal and FFT block 950 and the differential decoding block 960 may operate on a signal 904 received from the channel to produce decoded symbols 962.
  • the channel decoding block 970 may perform channel decoding to recover the more reliable bit sequence 906a based on the first subset of 8PSK constellation points (e.g., the solid circles) first since the bit sequence 906b.
  • the channel decoding block 980 is configured to perform channel decoding to recover the other bit sequence 906b.
  • the recovered bit sequence 906a and 906b are shown as decoded URLLC information bits 982.
  • FIG. 9 illustrates set partitioning with 8PSK
  • the transmitter 906 and the receiver 908 may apply any suitable set partitioning phase modulation techniques with differential modulation or coherent modulation for URLLC.
  • FIG. 10 is a flow diagram of a wireless communication method 1000 according to some aspects of the present disclosure. Aspects of the method 1000 can be executed by a computing device (e.g., a processor, processing circuit, and/or other suitable component) of a wireless communication device or other suitable means for performing the steps.
  • a wireless communication device such as the UEs 115 and/or 600 may utilize one or more components, such as the processor 602, the memory 604, the URLLC module 608, the transceiver 610, the modem 612, and the one or more antennas 616, to execute the steps of method 1000.
  • a wireless communication device such as the BSs 105 and/or 500 may utilize one or more components, such as the processor 502, the memory 504, the URLLC module 508, the transceiver 510, the modem 512, and the one or more antennas 516, to execute the steps of method 1000.
  • a transmitter such as the transmitters 706, 707, and/or 906 may implement the method 1000.
  • the method 1000 may employ similar mechanisms as discussed above with reference to FIGS. 1-3, 4A-4B, 7A-7C, 8A-B, and/or 9.
  • the method 1000 includes a number of enumerated steps, but aspects of the method 1000 may include additional steps before, after, and in between the enumerated steps. In some aspects, one or more of the enumerated steps may be omitted or performed in a different order.
  • a first wireless communication device transmits, to a second wireless communication device based on a coherent modulation mode, a first URLLC signal including coherently modulated first URLLC information data.
  • the first wireless communication device may utilize one or more components, such as the processor 502 or 602, the memory 504 or 604, the URLLC module 508 or 608, the transceiver 510 or 610, the modem 512 or 612, and the transmitter 707 or 906, to perform aspects of the block 1010.
  • the first wireless communication device switches between the coherent modulation mode and a non-coherent modulation mode.
  • the first wireless communication device may utilize one or more components, such as the processor 502 or 602, the memory 504 or 604, the URLLC module 508 or 608, the transceiver 510 or 610, and/or the modem 512 or 612, to perform aspects of the block 1020.
  • the first wireless communication device transmits, to the second wireless communication device based on the non-coherent modulation mode, a second URLLC signal including non-coherently modulated second URLLC information data.
  • the first wireless communication device may utilize one or more components, such as the processor 502 or 602, the memory 504 or 604, the URLLC module 508 or 608, the transceiver 510 or 610, the modem 512 or 612, and the transmitter 706 or 906, to perform aspects of the block 1030.
  • the first wireless communication device may refrain from including a DMRS in the second URLLC signal.
  • the switching to the coherent modulation mode and the non-coherent modulation mode at block 1020 may be based on various factors.
  • the first wireless communication device may switch to the coherent modulation mode from the non-coherent modulation mode based on an OFDM waveform associated with the first URLLC signal.
  • the first wireless communication device may switch to the non-coherent modulation mode from the coherent modulation mode based on an SC-OFDM waveform associated with the second URLLC signal.
  • the first wireless communication device may switch between the non-coherent modulation mode and the coherent modulation mode based on a channel measurement.
  • the first wireless communication device may switch between the non-coherent modulation mode and the coherent modulation mode based on at least one of a MCS, a SNR, or a spectral efficiency.
  • the first wireless communication device may further communicate, with the second wireless communication device, a modulation mode switching indication.
  • the first wireless communication device may further generate the second URLLC signal by non-coherently modulating the second URLLC information data across at least one of phase differences or amplitude differences of adjacent subcarriers of a plurality of frequency subcarriers. In some aspects, the first wireless communication device may further generate the second URLLC signal by non-coherently modulating the second URLLC information data across at least one of phase differences or amplitude differences of adjacent values of a sequence of values in a time domain and performing a DFT on the sequence of values.
  • the first wireless communication device may further generate the second URLLC signal by generating a first modulation symbol from one or more first bits of the second URLLC information data.
  • the first wireless communication device may also generate a first value associated with a first subcarrier in an OFDM symbol based on the first modulation symbol.
  • the first wireless communication device may also generate a second modulation symbol from one or more second bits of the second URLLC information data, where the one or more first bits are different from the one or more second bits.
  • the first wireless communication device may also generate a second value (e.g., y +1 ) associated with a second subcarrier in the OFDM symbol based on the first value (e.g., y ) and the second modulation symbol (e.g., S ), the second subcarrier being adjacent to the first subcarrier, for example, as shown in Equation (1).
  • the first wireless communication device may generate the first modulation symbol from the one or more first bits of the second URLLC information data based on at least one of a MPSK or an APSK scheme. In some aspects, as part of generating the second URLLC signal, the first wireless communication device may generate the first modulation symbol from the one or more first bits of the second URLLC information data based on a selection of a first constellation subset from a plurality of constellation subsets within a constellation set.
  • the first wireless communication device includes a BS
  • the second wireless communication device includes a UE
  • the BS may transmit, to the UE, a PDSCH signal including the non-coherently modulated second URLLC information data.
  • the BS may further transmit, to the UE in a first time period, a PDCCH signal, and as part of transmitting the second URLLC signal, the BS may also transmit, to the UE in a second time period adjacent to the first time period.
  • the PDSCH signal includes the non-coherently modulated second URLLC information data.
  • the first wireless communication device includes a UE
  • the second wireless communication device includes a BS
  • the UE may transmit a PUSCH signal including the non-coherently modulated second URLLC information data.
  • the UE may further receive, from the BS, a PDCCH signal in a first time period, and as part of transmitting the second URLLC signal at block 1030, the UE may also transmit, to the BS in a second time period.
  • the PUSCH signal includes the non- coherently modulated second URLLC information data, and the first time period and the second time period are spaced apart by a transmission gap.
  • the block 1020 can be optional.
  • the method 1000 may be applied to modulate first data coherently (e.g., a first modulation mode) at one time and modulate second data non-coherently (e.g., a second modulation mode) at another time.
  • the first data and/or the second data may have a target latency between about 1 ms to about 10 ms and a packet transmission reliability between about 10e-3 about 10e-5.
  • LIG. 11 is a flow diagram of a wireless communication method 1100 according to some aspects of the present disclosure. Aspects of the method 1100 can be executed by a computing device (e.g., a processor, processing circuit, and/or other suitable component) of a wireless communication device or other suitable means for performing the steps.
  • a wireless communication device such as the UEs 115 and/or 600 may utilize one or more components, such as the processor 602, the memory 604, the URLLC module 608, the transceiver 610, the modem 612, and the one or more antennas 616, to execute the steps of method 1100.
  • a wireless communication device such as the BSs 105 and/or 500 may utilize one or more components, such as the processor 502, the memory 504, the URLLC module 508, the transceiver 510, the modem 512, and the one or more antennas 516, to execute the steps of method 1100.
  • a receiver such as the receiver 708, 709, and/or 908 may implement the method 1100.
  • the method 1100 may employ similar mechanisms as discussed above with reference to LIGS. 1-3, 4A-4B, 7A-7C, 8A-B, and/or 9. As illustrated, the method 1100 includes a number of enumerated steps, but aspects of the method 1100 may include additional steps before, after, and in between the enumerated steps.
  • a first wireless communication device receives, from a second wireless communication device based on a coherent modulation mode, a first URLLC signal including coherently modulated first URLLC information data.
  • the first wireless communication device may utilize one or more components, such as the processor 502 or 602, the memory 504 or 604, the URLLC module 508 or 608, the transceiver 510 or 610, the modem 512 or 612, and the receiver 709 or 908, to perform aspects of the block 1110.
  • the first wireless communication device switches between the coherent modulation mode and a non-coherent modulation mode.
  • the first wireless communication device may utilize one or more components, such as the processor 502 or 602, the memory 504 or 604, the URLLC module 508 or 608, the transceiver 510 or 610, and/or the modem 512 or 612, to perform aspects of the block 1120.
  • the first wireless communication device receives, from the second wireless communication device based on the non-coherent modulation mode, a second URLLC signal including non-coherently modulated second URLLC information data.
  • the first wireless communication device may utilize one or more components, such as the processor 502 or 602, the memory 504 or 604, the URLLC module 508 or 608, the transceiver 510 or 610, the modem 512 or 612, and the receiver 708 or 908, to perform aspects of the block 1130.
  • the switching to the coherent modulation mode and the non-coherent modulation mode at block 1020 may be based on various factors.
  • the first wireless communication device may switch to the coherent modulation mode from the non-coherent modulation mode based on an OFDM waveform associated with the first URLLC signal.
  • the first wireless communication device may switch to the non-coherent modulation mode from the coherent modulation mode based on an SC-OFDM waveform associated with the second URLLC signal.
  • the first wireless communication device may switch between the non-coherent modulation mode and the coherent modulation mode based on a channel measurement.
  • the first wireless communication device may switch between the non-coherent modulation mode and the coherent modulation mode based on at least one of a MCS, a SNR, or a spectral efficiency.
  • the first wireless communication device may further communicate, with the second wireless communication device, a modulation mode switching indication.
  • the second URLLC signal does not include a demodulation reference signal (DMRS), and the first wireless communication device may further refrain from performing a channel estimation from the second URLLC signal.
  • the first wireless communication device may further decode the second URLLC information data based on at least one of phase differences or amplitude differences of adjacent subcarriers of a plurality of frequency subcarriers in the second URLLC signal.
  • the first wireless communication device may further perform a frequency domain equalization on the second URLLC signal.
  • the first wireless communication device may also perform an IDFT on the second URLLC signal to produce a sequence of values in a time domain.
  • the first wireless communication device may also decode the second URLLC information data based on at least one of phase differences or amplitude differences of adjacent values of the sequence of values.
  • the first wireless communication device may further perform an IDFT on the second URLLC signal to produce a sequence of values in a time domain.
  • the first wireless communication device may also perform a time domain equalization on the second URLLC signal to produce a sequence of values.
  • the first wireless communication device may also decode the second URLLC information data based on at least one of phase differences or amplitude differences of adjacent values of the sequence of values, for example, using Equation (3) or Equation (4).
  • the first wireless communication device may further perform at least one of a FFT or an IDFT on the second URLLC signal to produce a sequence of values associated with an OFDM symbol.
  • the first wireless communication device may also decode the second URLLC information data based on a first value (e.g., r k ) and a second value (e.g., r k+1) of the sequence of values, the first value associated with a first subcarrier in the OFDM symbol, the second value associated with a second subcarrier in the OFDM symbol, and the second subcarrier being adjacent to the first subcarrier.
  • the first wireless communication device may further perform at least one of a FFT or an IDFT on the second URLLC signal to produce a sequence of values associated with an OFDM symbol.
  • the first wireless communication device may also decode the second URLLC information data based on a first value of the sequence of values and a reference value, the first value associated with a first subcarrier in the OFDM symbol, the reference value associated with a reference subcarrier in the OFDM symbol, and the reference subcarrier being adjacent to the first subcarrier.
  • the first wireless communication device may further decode the second URLLC information data from the second URLLC signal based on at least one of a MPSK or an APSK scheme.
  • the first wireless communication device may further decode a first portion of the second URLLC information data from the second URLLC signal based on a first constellation subset of a plurality of constellation subsets within a constellation set.
  • the first wireless communication device may also decode a second portion of the second URLLC information data from the second URLLC signal based on a second constellation subset of the plurality of constellation subsets.
  • the first wireless communication device includes a BS
  • the second wireless communication device includes a UE
  • the BS may receive, from the UE, a PUSCH signal including the non-coherently modulated second URLLC information data.
  • the BS may further transmit, to the UE in a first time period, a physical downlink control channel (PDCCH) signal, as part of receiving the second URLLC signal at block 1130, the BS may receive, from the UE in a second time period, the PUSCH signal, where the first time period and the second time period are spaced apart by a transmission gap.
  • PDCCH physical downlink control channel
  • the first wireless communication device includes a UE
  • the second wireless communication device includes a BS
  • the UE may receive, from the BS, a PDSCH signal including the non-coherently modulated second URLLC information data.
  • the UE may further receive, from the BS in a first time period, a PDCCH signal.
  • the UE may further receive, from the BS in a second time period adjacent to the first time period, the PDSCH signal including the non-coherently modulated second URLLC information data.
  • the block 1120 can be optional.
  • the method 1100 may be applied to receive a signal with coherently modulated data (e.g., based on a first modulation mode) first data at one time and receive a signal with non-coherently modulated data (e.g., based on a second modulation mode) at another time.
  • the coherently modulated data and/or the non-coherently modulated data may have a target latency between about 1 ms to about 10 ms and a packet transmission reliability between about 10e-3 about 10e-5.
  • Aspect 1 includes a method of wireless communication, comprising transmitting, by a first wireless communication device to a second wireless communication device based on a coherent modulation mode, a first ultra-reliable low-latency communication (URLLC) signal including coherently modulated first URLLC information data; switching, by the first wireless communication device, between the coherent modulation mode and a non-coherent modulation mode; and transmitting, by the first wireless communication device to the second wireless communication device based on the non-coherent modulation mode, a second URLLC signal including non-coherently modulated second URLLC information data.
  • URLLC ultra-reliable low-latency communication
  • Aspect 2 includes the method of aspect 1, wherein the switching between the coherent modulation mode and the non-coherent modulation mode includes at least one of switching, by the first wireless communication device, to the coherent modulation mode from the non-coherent modulation mode based on an orthogonal frequency-division multiplexing (OFDM) waveform associated with the first URLLC signal; or switching, by the first wireless communication device, to the non-coherent modulation mode from the coherent modulation mode based on a single carrier- orthogonal frequency-division multiplexing (SC-OFDM) waveform associated with the second URLLC signal.
  • OFDM orthogonal frequency-division multiplexing
  • Aspect 3 includes the method of any of aspects 1-2, wherein the switching between the coherent modulation mode and the non-coherent modulation mode includes switching, by the first wireless communication device, between the non-coherent modulation mode and the coherent modulation mode based on a channel measurement.
  • Aspect 4 includes the method of any of aspects 1-3, wherein the switching between the non coherent modulation mode and the coherent modulation mode includes switching, by the first wireless communication device, between the non-coherent modulation mode and the coherent modulation mode based on at least one of a modulation coding scheme (MCS), a signal-to-noise- ratio (SNR), or a spectral efficiency.
  • MCS modulation coding scheme
  • SNR signal-to-noise- ratio
  • Aspect 5 includes the method of any of aspects 1-4, further comprising communicating, by the first wireless communication device with the second wireless communication device, a modulation mode switching indication.
  • Aspect 6 includes the method of any of aspects 1-5, wherein the transmitting the second URLLC signal includes refraining, by the first wireless communication device, from including a demodulation reference signal (DMRS) in the second URLLC signal.
  • DMRS demodulation reference signal
  • Aspect 7 includes the method of any of aspects 1-6, further comprising generating, by the first wireless communication device, the second URLLC signal by non-coherently modulating the second URLLC information data across at least one of phase differences or amplitude differences of adjacent subcarriers of a plurality of frequency subcarriers.
  • Aspect 8 includes the method of any of aspects 1-6, further comprising generating, by the first wireless communication device, the second URLLC signal by non-coherently modulating the second URLLC information data across at least one of phase differences or amplitude differences of adjacent values of a sequence of values in a time domain; and performing, by the first wireless communication device, a discrete Fourier transform (DFT) on the sequence of values.
  • DFT discrete Fourier transform
  • Aspect 9 includes the method of any of aspects 1-8, further comprising generating, by the first wireless communication device, the second URLLC signal by generating, by the first wireless communication device, a first modulation symbol from one or more first bits of the second URLLC information data; generating, by the first wireless communication device, a first value associated with a first subcarrier in an orthogonal frequency-division multiplexing (OFDM) symbol based on the first modulation symbol; generating, by the first wireless communication device, a second modulation symbol from one or more second bits of the second URLLC information data, the one or more first bits being different from the one or more second bits; and generating, by the first wireless communication device, a second value associated with a second subcarrier in the OFDM symbol based on the first value and the second modulation symbol, the second subcarrier being adjacent to the first subcarrier.
  • OFDM orthogonal frequency-division multiplexing
  • Aspect 10 includes the method of any of aspects 1-9, wherein the generating the second URLLC signal further includes generating, by the first wireless communication device, the first value further based on a reference value associated with a reference subcarrier in the OFDM symbol, the reference subcarrier being adjacent to the first subcarrier.
  • Aspect 11 includes the method of any of aspects 1-10, wherein the generating the second URLLC signal further includes generating, by the first wireless communication device, the first modulation symbol from the one or more first bits of the second URLLC information data based on at least one of a M-ary phase-shift-keying (MPSK) scheme or an amplitude-phase-shift-keying (APSK) scheme.
  • MPSK M-ary phase-shift-keying
  • APSK amplitude-phase-shift-keying
  • Aspect 12 includes the method of any of aspects 1-11, wherein the generating the second URLLC signal further includes generating, by the first wireless communication device, the first modulation symbol from the one or more first bits of the second URLLC information data based on a selection of a first constellation subset from a plurality of constellation subsets within a constellation set.
  • Aspect 13 includes the method of any of aspects 1-12, wherein the first wireless communication device includes a base station (BS), wherein the second wireless communication device includes a user equipment (UE), and wherein the transmitting the second URLLC signal includes transmitting, by the BS to the UE, a physical downlink shared channel (PDSCH) signal including the non-coherently modulated second URLLC information data.
  • BS base station
  • UE user equipment
  • PDSCH physical downlink shared channel
  • Aspect 14 includes the method of any of aspects 1-13, further comprising transmitting, by the BS to the UE in a first time period, a physical downlink control channel (PDCCH) signal, wherein the transmitting the second URLLC signal further includes transmitting, by the BS to the UE in a second time period adjacent to the first time period, the PDSCH signal including the non- coherently modulated second URLLC information data.
  • a physical downlink control channel (PDCCH) signal
  • Aspect 15 includes the method of any of aspects 1-12, wherein the first wireless communication device includes a user equipment (UE), wherein the second wireless communication device includes a base station (BS), and wherein the transmitting the second URLLC signal includes transmitting, by the UE to the BS, a physical uplink shared channel (PUSCH) signal including the non-coherently modulated second URLLC information data.
  • the first wireless communication device includes a user equipment (UE)
  • the second wireless communication device includes a base station (BS)
  • the transmitting the second URLLC signal includes transmitting, by the UE to the BS, a physical uplink shared channel (PUSCH) signal including the non-coherently modulated second URLLC information data.
  • PUSCH physical uplink shared channel
  • Aspect 16 includes the method of any of aspects 1-12 or 15, further comprising receiving, by the UE from the BS, a physical downlink control channel (PDCCH) signal in a first time period, wherein the transmitting the second URLLC signal further includes transmitting, by the UE to the BS in a second time period, the PUSCH signal including the non-coherently modulated second URLLC information data, wherein the first time period and the second time period is spaced apart by a transmission gap.
  • PDCCH physical downlink control channel
  • Aspect 17 includes a method of wireless communication, comprising receiving, by a first wireless communication device from a second wireless communication device based on a coherent modulation mode, a first ultra-reliable low-latency communication (URLLC) signal including coherently modulated first URLLC information data; switching, by the first wireless communication device, between the coherent modulation mode and a non-coherent modulation mode; and receiving, by the first wireless communication device from the second wireless communication device based on the non-coherent modulation mode, a second URLLC signal including non-coherently modulated second URLLC information data.
  • URLLC ultra-reliable low-latency communication
  • Aspect 18 includes the method of aspect 17, wherein the switching between the coherent modulation mode and the non-coherent modulation mode includes at least one of switching, by the first wireless communication device, to the coherent modulation mode from the non-coherent modulation mode based on an orthogonal frequency-division multiplexing (OLDM) waveform associated with the first URLLC signal; or switching, by the first wireless communication device, to the non-coherent modulation mode from the coherent modulation mode based on a single carrier- orthogonal frequency-division multiplexing (SC-OLDM) waveform associated with the second URLLC signal.
  • the switching between the coherent modulation mode and the non-coherent modulation mode includes at least one of switching, by the first wireless communication device, to the coherent modulation mode from the non-coherent modulation mode based on an orthogonal frequency-division multiplexing (OLDM) waveform associated with the first URLLC signal; or switching, by the first wireless communication device, to the non-coherent modulation mode from the coherent modulation mode
  • Aspect 19 includes the method of any of aspects 17-18, wherein the switching between the coherent modulation mode and the non-coherent modulation mode includes switching, by the first wireless communication device, between the non-coherent modulation mode and the coherent modulation mode based on a channel measurement.
  • Aspect 20 includes the method of any of aspects 17-19, wherein the switching between the non-coherent modulation mode and the coherent modulation mode includes switching, by the first wireless communication device, between the non-coherent modulation mode and the coherent modulation mode based on at least one of a modulation coding scheme (MCS), a signal-to-noise- ratio (SNR), or a spectral efficiency.
  • MCS modulation coding scheme
  • SNR signal-to-noise- ratio
  • Aspect 21 includes the method of any of aspects 17-20, further comprising communicating, by the first wireless communication device with the second wireless communication device, a modulation mode switching indication.
  • Aspect 22 includes the method of any of aspects 17-21, wherein the second URLLC signal does not include a demodulation reference signal (DMRS), the method further comprising refraining, by the first wireless communication device, from performing a channel estimation from the second URLLC signal.
  • DMRS demodulation reference signal
  • Aspect 23 includes the method of any of aspects 17-22, further comprising decoding, by the first wireless communication device, the second URLLC information data based on at least one of phase differences or amplitude differences of adjacent subcarriers of a plurality of frequency subcarriers in the second URLLC signal.
  • Aspect 24 includes the method of any of aspects 17-22, further comprising performing, by the first wireless communication device, a frequency domain equalization on the second URLLC signal; performing, by the first wireless communication device, an inverse discrete Fourier transform (IDFT) on the second URLLC signal to produce a sequence of values in a time domain; and decoding, by the first wireless communication device, the second URLLC information data based on at least one of phase differences or amplitude differences of adjacent values of the sequence of values.
  • IDFT inverse discrete Fourier transform
  • Aspect 25 includes the method of any of aspects 17-22, further comprising performing, by the first wireless communication device, an inverse discrete Fourier transform (IDFT) on the second URLLC signal to produce a sequence of values in a time domain; performing, by the first wireless communication device, a time domain equalization on the second URLLC signal to produce a sequence of values; and decoding, by the first wireless communication device, the second URLLC information data based on at least one of phase differences or amplitude differences of adjacent values of the sequence of values.
  • IDFT inverse discrete Fourier transform
  • Aspect 26 includes the method of any of aspects 17-22, further comprising performing, by the first wireless communication device, at least one of a fast Fourier transform (FFT) or an inverse discrete Fourier transform (IDFT) on the second URLLC signal to produce a sequence of values associated with an orthogonal frequency-division multiplexing (OFDM) symbol; and decoding the second URLLC information data based on a first value and a second value of the sequence of values, the first value associated with a first subcarrier in the OFDM symbol, the second value associated with a second subcarrier in the OFDM symbol, and the second subcarrier being adjacent to the first subcarrier.
  • FFT fast Fourier transform
  • IDFT inverse discrete Fourier transform
  • Aspect 27 includes the method of any of aspects 17-22, further comprising performing, by the first wireless communication device, at least one of a fast Fourier transform (FFT) or an inverse discrete Fourier transform (IDFT) on the second URLLC signal to produce a sequence of values associated with an orthogonal frequency-division multiplexing (OFDM) symbol; and decoding the second URLLC information data based on a first value of the sequence of values and a reference value, the first value associated with a first subcarrier in the OFDM symbol, the reference value associated with a reference subcarrier in the OFDM symbol, and the reference subcarrier being adjacent to the first subcarrier.
  • FFT fast Fourier transform
  • IDFT inverse discrete Fourier transform
  • Aspect 28 includes the method of any of aspects 17-27, further comprising decoding, by the first wireless communication device, the second URLLC information data from the second URLLC signal based on at least one of a M-ary phase-shift-keying (MPSK) scheme or an amplitude-phase- shift-keying (APSK) scheme.
  • MPSK M-ary phase-shift-keying
  • APSK amplitude-phase- shift-keying
  • Aspect 29 includes the method of any of aspects 17-28, further comprising decoding, by the first wireless communication device, a first portion of the second URLLC information data from the second URLLC signal based on a first constellation subset of a plurality of constellation subsets within a constellation set; and decoding, by the first wireless communication device, a second portion of the second URLLC information data from the second URLLC signal based on a second constellation subset of the plurality of constellation subsets.
  • Aspect 30 includes the method of any of aspects 17-29, wherein the first wireless communication device includes a base station (BS), wherein the second wireless communication device includes a user equipment (UE), and wherein the receiving the second URLLC signal includes receiving, by the BS from the UE, a physical uplink shared channel (PUSCH) signal including the non-coherently modulated second URLLC information data.
  • BS base station
  • UE user equipment
  • PUSCH physical uplink shared channel
  • Aspect 31 includes the method of any of aspects 17-30, further comprising transmitting, by the BS to the UE in a first time period, a physical downlink control channel (PDCCH) signal, wherein the receiving the second URLLC signal further includes receiving, by the BS from the UE in a second time period, the PUSCH signal, wherein the first time period and the second time period is spaced apart by a transmission gap.
  • a physical downlink control channel PDCCH
  • Aspect 32 includes the method of any of aspects 17-29, wherein the first wireless communication device includes a user equipment (UE), wherein the second wireless communication device includes a base station (BS), and wherein the receiving the second URLLC signal includes receiving, by the UE from the BS, a physical downlink shared channel (PDSCH) signal including the non-coherently modulated second URLLC information data.
  • the first wireless communication device includes a user equipment (UE)
  • the second wireless communication device includes a base station (BS)
  • PDSCH physical downlink shared channel
  • Aspect 33 includes the method of any of aspects 17-29 or 32, further comprising receiving, by the UE from the BS in a first time period, a physical downlink control channel (PDCCH) signal, wherein the receiving the second URLLC signal further includes receiving, by the UE from the BS in a second time period adjacent to the first time period, the PDSCH signal including the non- coherently modulated second URLLC information data.
  • a physical downlink control channel PDCCH
  • a method can include transmitting or receiving by a first wireless communication device with a second wireless communication device based on a coherent modulation mode, a first ultra-reliable low-latency communication (URLLC) signal including coherently modulated first URLLC information data.
  • the method can also include transmitting or receiving, by the first wireless communication device to the second wireless communication device based on the non coherent modulation mode, a second URLLC signal including non-coherently modulated second URLLC information data.
  • a method can also include switching, by the first wireless communication device, between a coherent modulation mode and a non-coherent modulation mode.
  • URLLC ultra-reliable low-latency communication
  • Lurther one aspect includes an apparatus comprising a processor coupled to a transceiver, wherein the processor and transceiver are configured to perform the method of any one of aspects 1- 16.
  • Another aspect includes an apparatus comprising means for performing the method of any one of aspects 1-16.
  • Another aspect includes a non-transitory computer readable medium including program code, which when executed by one or more processors, causes a wireless communication device to perform the method of any one of aspects 1-16.
  • Another aspect includes an apparatus comprising a processor coupled to a transceiver, wherein the processor and transceiver are configured to perform the method of any one of aspects 17-33.
  • Another aspect includes an apparatus comprising means for performing the method of any one of aspects 17-33.
  • Another aspect includes a non-transitory computer readable medium including program code, which when executed by one or more processors, causes a wireless communication device to perform the method of any one of aspects 17-33.
  • Information and signals may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
  • a general-purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine.
  • a processor may also be implemented as a combination of computing devices (e.g ., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration).
  • the functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope of the disclosure and appended claims. For example, due to the nature of software, functions described above can be implemented using software executed by a processor, hardware, firmware, hardwiring, or combinations of any of these. Features implementing functions may also be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations.
  • “or” as used in a list of items indicates an inclusive list such that, for example, a list of [at least one of A, B, or C] means A or B or C or AB or AC or BC or ABC (i.e., A and B and C).

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Abstract

La présente invention concerne des procédés associés à des systèmes de communication sans fil et une communication avec commutation dynamique entre une modulation cohérente et non cohérente. Un premier dispositif de communication sans fil transmet à un second dispositif de communication sans fil, sur la base d'un mode de modulation cohérent, un premier signal de communication comprenant des premières données d'informations modulées de manière cohérente. Le premier dispositif de communication sans fil transmet au second dispositif de communication sans fil, sur la base d'un mode de modulation non cohérent, un second signal de communication comprenant des secondes données d'informations modulées de manière non cohérente. L'invention revendique et concerne également d'autres caractéristiques.
PCT/US2021/030733 2020-05-05 2021-05-04 Commutation dynamique entre une modulation cohérente et non cohérente pour une communication à faible latence ultra-fiable (urllc) Ceased WO2021226144A1 (fr)

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