WO2021114215A1 - Regroupement de précodeur de liaison montante et rétroaction de tpmi pour précodage de sous-bande - Google Patents

Regroupement de précodeur de liaison montante et rétroaction de tpmi pour précodage de sous-bande Download PDF

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Publication number
WO2021114215A1
WO2021114215A1 PCT/CN2019/125089 CN2019125089W WO2021114215A1 WO 2021114215 A1 WO2021114215 A1 WO 2021114215A1 CN 2019125089 W CN2019125089 W CN 2019125089W WO 2021114215 A1 WO2021114215 A1 WO 2021114215A1
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WIPO (PCT)
Prior art keywords
dci transmission
tpmis
base station
dci
transmission
Prior art date
Application number
PCT/CN2019/125089
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English (en)
Inventor
Liangming WU
Qiaoyu Li
Yu Zhang
Chenxi HAO
Hao Xu
Wanshi Chen
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Qualcomm Incorporated
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Publication date
Application filed by Qualcomm Incorporated filed Critical Qualcomm Incorporated
Priority to PCT/CN2019/125089 priority Critical patent/WO2021114215A1/fr
Publication of WO2021114215A1 publication Critical patent/WO2021114215A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting

Definitions

  • Wireless communication networks are widely deployed to provide various communication services such as voice, video, packet data, messaging, broadcast, and the like. These wireless networks may be multiple-access networks capable of supporting multiple users by sharing the available network resources. Such networks, which are usually multiple access networks, support communications for multiple users by sharing the available network resources.
  • a wireless communication network may include a number of base stations or node Bs that can support communication for a number of user equipments (UEs) .
  • a UE may communicate with a base station via downlink and uplink.
  • the downlink (or forward link) refers to the communication link from the base station to the UE
  • the uplink (or reverse link) refers to the communication link from the UE to the base station.
  • a base station may transmit data and control information on the downlink to a UE and/or may receive data and control information on the uplink from the UE.
  • a transmission from the base station may encounter interference due to transmissions from neighbor base stations or from other wireless radio frequency (RF) transmitters.
  • RF radio frequency
  • a transmission from the UE may encounter interference from uplink transmissions of other UEs communicating with the neighbor base stations or from other wireless RF transmitters. This interference may degrade performance on both the downlink and uplink.
  • uplink precoding has been supported by wireless communication systems since the advent of long-term evolution (LTE) .
  • LTE long-term evolution
  • 5G-NR fifth generation new radio
  • codebook has been leveraged from LTE to 5G-NR, which supports rank less than or equal to four with wideband precoding.
  • wideband precoding is insufficient to meet requirements of uplink data transmission in 5G-NR.
  • a method of wireless communication includes receiving, at a user equipment (UE) from a base station, a first downlink control information (DCI) transmission indicating information corresponding to a wideband transmitted precoding matrix indicator (TPMI) .
  • the method also includes receiving, at the UE from the base station, a second DCI transmission indicating information corresponding to subband TPMIs.
  • the method further includes transmitting, from the UE to the base station, data in accordance with the subband TPMIs.
  • DCI downlink control information
  • TPMI wideband transmitted precoding matrix indicator
  • an apparatus configured for wireless communication.
  • the apparatus includes at least one processor, and a memory coupled to the at least one processor.
  • the at least one processor is configured to receive, at a user equipment (UE) from a base station, a first downlink control information (DCI) transmission indicating information corresponding to a wideband transmitted precoding matrix indicator (TPMI) .
  • the at least one processor is also configured to receive, at the UE from the base station, a second DCI transmission indicating information corresponding to subband TPMIs.
  • the at least one processor is further configured to initiate transmission, from the UE to the base station, of data in accordance with the subband TPMIs.
  • DCI downlink control information
  • TPMI wideband transmitted precoding matrix indicator
  • an apparatus configured for wireless communication.
  • the apparatus includes means for receiving, at a user equipment (UE) from a base station, a first downlink control information (DCI) transmission indicating information corresponding to a wideband transmitted precoding matrix indicator (TPMI) .
  • DCI downlink control information
  • TPMI wideband transmitted precoding matrix indicator
  • the apparatus also includes means for receiving, at the UE from the base station, a second DCI transmission indicating information corresponding to subband TPMIs.
  • the apparatus further includes means for transmitting, from the UE to the base station, data in accordance with the subband TPMIs.
  • a non-transitory computer-readable medium stores instructions that, when executed by a processor, cause the processor to perform operations including receiving, at a user equipment (UE) from a base station, a first downlink control information (DCI) transmission indicating information corresponding to a wideband transmitted precoding matrix indicator (TPMI) .
  • the operations also include receiving, at the UE from the base station, a second DCI transmission indicating information corresponding to subband TPMIs.
  • the operations further include initiating transmission, from the UE to the base station, of data in accordance with the subband TPMIs.
  • DCI downlink control information
  • TPMI wideband transmitted precoding matrix indicator
  • a method for wireless communication includes transmitting, from a base station to a user equipment (UE) , a first downlink control information (DCI) transmission indicating information corresponding to a wideband transmitted precoding matrix indicator (TPMI) .
  • the method further includes transmitting, from the base station to the UE, a second DCI transmission indicating information corresponding to subband TPMIs.
  • DCI downlink control information
  • TPMI wideband transmitted precoding matrix indicator
  • an apparatus configured for wireless communication.
  • the apparatus includes at least one processor, and a memory coupled to the at least one processor.
  • the at least one processor is configured to initiate transmission, from a base station to a user equipment (UE) , of a first downlink control information (DCI) transmission indicating information corresponding to a wideband transmitted precoding matrix indicator (TPMI) .
  • the at least one processor is further configured to initiate transmission, from the base station to the UE, of a second DCI transmission indicating information corresponding to subband TPMIs.
  • DCI downlink control information
  • TPMI wideband transmitted precoding matrix indicator
  • an apparatus configured for wireless communication.
  • the apparatus includes means for transmitting, from a base station to a user equipment (UE) , a first downlink control information (DCI) transmission indicating information corresponding to a wideband transmitted precoding matrix indicator (TPMI) .
  • DCI downlink control information
  • TPMI wideband transmitted precoding matrix indicator
  • the apparatus further includes means for transmitting, from the base station to the UE, a second DCI transmission indicating information corresponding to subband TPMIs.
  • a non-transitory computer-readable medium stores instructions that, when executed by a processor, cause the processor to perform operations including initiating transmission, from a base station to a user equipment (UE) , of a first downlink control information (DCI) transmission indicating information corresponding to a wideband transmitted precoding matrix indicator (TPMI) .
  • the operations further include initiating transmission, from the base station to the UE, of a second DCI transmission indicating information corresponding to subband TPMIs.
  • DCI downlink control information
  • TPMI wideband transmitted precoding matrix indicator
  • a method of wireless communication includes receiving, at a user equipment (UE) from a base station, a downlink control information (DCI) transmission indicating first information corresponding to a wideband transmitted precoding matrix indicator (TPMI) and second information corresponding to subband TPMIs.
  • DCI downlink control information
  • the method further includes transmitting, from the UE to the base station, data in accordance with the subband TPMIs.
  • FIG. 1 is a block diagram illustrating details of a wireless communication system according to some aspects.
  • FIG. 2 is a block diagram conceptually illustrating a design of a base station and a UE configured according to some aspects.
  • FIG. 3 is a block diagram illustrating details of a wireless communication system according to some aspects.
  • FIG. 4 is a diagram of communications, such as DCI and PUSCH transmissions, performed between a base station and a UE according to some aspects.
  • FIG. 5 is a diagram of communications, such as DCI and PUSCH transmissions, performed between a base station and a UE according to some aspects.
  • FIG. 6 is a flow diagram illustrating example blocks of a method executed by a UE according to some aspects.
  • FIG. 7 is a flow diagram illustrating example blocks of a method executed by a base station according to some aspects.
  • FIG. 8 is a block diagram conceptually illustrating an example design of a UE according to some aspects.
  • FIG. 9 is a block diagram conceptually illustrating an example design of a base station according to some aspects.
  • Subband precoding refers to precoding on the subband level, as compared to precoding on the wideband level.
  • the precoding matrix indicators (PMIs) of the fifth generation new radio (5G-NR) codebook are further grouped to support precoding of subbands.
  • Information related to the subband precoding may be shared with a user equipment (UE) via a two-stage downlink control information (DCI) transmission.
  • UE user equipment
  • DCI downlink control information
  • a base station may transmit, to the UE, a first DCI transmission that indicates information corresponding to a wideband transmitted PMI (TPMI) .
  • TPMI wideband transmitted PMI
  • the base station may also transmit, to the UE, a second DCI transmission that indicates information corresponding to subband TPMIs.
  • the information in the second DCI transmission may indicate groupings of TPMIs to various subbands, as compared to a TPMI for wideband.
  • the UE may transmit, to the base station, data in accordance with the subband TPMIs.
  • two DCI transmissions are described, in other implementations, an entirety of the information may be communicated within a single DCI transmission.
  • uplink subband precoding may be supported between the UE and the base station. Enabling precoding at the subband level (e.g., at a finer granularity) may improve the speed and reliability of uplink data transmissions, thereby improving throughput and reducing latency in the wireless communication system.
  • This disclosure relates generally to providing or participating in communication as between two or more wireless devices in one or more wireless communications systems, also referred to as wireless communications networks.
  • 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, GSM networks, 5 th Generation (5G) or new radio (NR) networks (sometimes referred to as “5G NR” networks/systems/devices) , 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
  • a CDMA network may implement a radio technology such as universal terrestrial radio access (UTRA) , cdma2000, and the like.
  • UTRA includes wideband-CDMA (W-CDMA) and low chip rate (LCR) .
  • CDMA2000 covers IS-2000, IS-95, and IS-856 standards.
  • a TDMA network may, for example implement a radio technology such as GSM.
  • 3GPP defines standards for the GSM EDGE (enhanced data rates for GSM evolution) radio access network (RAN) , also denoted as GERAN.
  • GERAN is the radio component of GSM/EDGE, together with the network that joins the base stations (for example, the Ater and Abis interfaces) and the base station controllers (Ainterfaces, etc. ) .
  • the radio access network represents a component of a GSM network, through which phone calls and packet data are routed from and to the public switched telephone network (PSTN) and Internet to and from subscriber handsets, also known as user terminals or user equipments (UEs) .
  • PSTN public switched telephone network
  • UEs subscriber handsets
  • a mobile phone operator's network may comprise one or more GERANs, which may be coupled with Universal Terrestrial Radio Access Networks (UTRANs) in the case of a UMTS/GSM network.
  • UTRANs Universal Terrestrial Radio Access Networks
  • An operator network may also include one or more LTE networks, and/or one or more other networks.
  • the various different network types may use different radio access technologies (RATs) and radio access networks (RANs) .
  • RATs radio access technologies
  • RANs radio access networks
  • An OFDMA network may implement a radio technology such as evolved UTRA (E-UTRA) , IEEE 802.11, IEEE 802.16, IEEE 802.20, flash-OFDM and the like.
  • E-UTRA evolved UTRA
  • 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)
  • 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
  • UMTS universal mobile telecommunications system
  • 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. To achieve these goals, 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 an 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
  • 5G NR devices, networks, and systems may be implemented to use optimized OFDM-based waveform features. These features may include scalable numerology and transmission time intervals (TTIs) ; 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 advanced wireless technologies, such as massive multiple input, multiple output (MIMO) , robust millimeter wave (mmWave) transmissions, advanced channel coding, and device-centric mobility.
  • TTIs transmission time intervals
  • TDD dynamic, low-latency time division duplex
  • FDD frequency division duplex
  • advanced wireless technologies such as massive multiple input, multiple output (MIMO) , 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.
  • subcarrier spacing may occur with 15 kHz, for example over 1, 5, 10, 20 MHz, and the like bandwidth.
  • subcarrier spacing may occur with 30 kHz over 80/100 MHz bandwidth.
  • the subcarrier spacing may occur with 60 kHz over a 160 MHz bandwidth.
  • subcarrier spacing may occur with 120 kHz over a 500MHz bandwidth.
  • the scalable numerology of 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 uplink/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 uplink/downlink that may be flexibly configured on a per-cell basis to dynamically switch between uplink and downlink to meet the current traffic needs.
  • LTE terminology may be used as illustrative examples in portions of the description below; however, the description is not intended to be limited to LTE applications.
  • the present disclosure is concerned with shared access to wireless spectrum between networks using different radio access technologies or radio air interfaces, such as those of 5G NR.
  • wireless communication networks adapted according to the concepts herein may operate with any combination of licensed or unlicensed spectrum depending on loading and availability. Accordingly, it will be apparent to one of skill in the art that the systems, apparatus and methods described herein may be applied to other communications systems and applications than the particular examples provided.
  • Implementations may range from chip-level or modular components to non-modular, non-chip-level implementations and further to aggregated, distributed, or OEM devices or systems incorporating one or more described aspects.
  • devices incorporating described aspects and features may also necessarily include additional components and features for implementation and practice of claimed and described embodiments. It is intended that innovations described herein may be practiced in a wide variety of implementations, including both large/small devices, chip-level components, multi-component systems (e.g. RF-chain, communication interface, processor) , distributed arrangements, end-user devices, etc. of varying sizes, shapes, and constitution.
  • FIG. 1 shows wireless network 100 for communication according to some embodiments.
  • Wireless network 100 may, for example, comprise a 5G wireless network.
  • components appearing in FIG. 1 are likely to have related counterparts in other network arrangements including, for example, cellular-style network arrangements and non-cellular-style-network arrangements (e.g., device to device or peer to peer or ad hoc network arrangements, etc. ) .
  • Wireless network 100 illustrated in FIG. 1 includes a number of base stations 105 and other network entities.
  • a base station may be a station that communicates with the UEs 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 base station 105 may provide communication coverage for a particular geographic area.
  • the term “cell” can refer to this particular geographic coverage area of a base station and/or a base station subsystem serving the coverage area, depending on the context in which the term is used.
  • base stations 105 may be associated with a same operator or different operators (e.g., wireless network 100 may comprise a plurality of operator wireless networks) , and may provide wireless communications using one or more of the same frequencies (e.g., one or more frequency bands in licensed spectrum, unlicensed spectrum, or a combination thereof) as a neighboring cell.
  • an individual base station 105 or UE 115 may be operated by more than one network operating entity.
  • each base station 105 and UE 115 may be operated by a single network operating entity.
  • 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 base station for a macro cell may be referred to as a macro base station.
  • a base station for a small cell may be referred to as a small cell base station, a pico base station, a femto base station or a home base station. In the example shown in FIG.
  • base stations 105d and 105e are regular macro base stations, while base stations 105a-105c are macro base stations enabled with one of 3 dimension (3D) , full dimension (FD) , or massive MIMO. Base stations 105a-105c take advantage of their higher dimension MIMO capabilities to exploit 3D beamforming in both elevation and azimuth beamforming to increase coverage and capacity.
  • Base station 105f is a small cell base station which may be a home node or portable access point.
  • a base station may support one or multiple (e.g., two, three, four, and the like) cells.
  • Wireless network 100 may support synchronous or asynchronous operation.
  • the base stations may have similar frame timing, and transmissions from different base stations may be approximately aligned in time.
  • the base stations may have different frame timing, and transmissions from different base stations may not be aligned in time.
  • networks may be enabled or configured to handle dynamic switching between synchronous or asynchronous operations.
  • UEs 115 are dispersed throughout the wireless network 100, and each UE may be stationary or mobile.
  • a mobile apparatus is commonly referred to as user equipment (UE) in standards and specifications promulgated by the 3rd Generation Partnership Project (3GPP)
  • UE user equipment
  • 3GPP 3rd Generation Partnership Project
  • a mobile station MS
  • subscriber station a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communications device, a remote device, a mobile subscriber station, an access terminal (AT) , a mobile terminal, a wireless terminal, a remote terminal, a handset, a terminal, a user agent, a mobile client, a client, or some other suitable terminology.
  • AT access terminal
  • a “mobile” apparatus or UE need not necessarily have a capability to move, and may be stationary.
  • Some non-limiting examples of a mobile apparatus include a mobile, a cellular (cell) phone, a smart phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a laptop, a personal computer (PC) , a notebook, a netbook, a smart book, a tablet, gaming devices, reality modification devices (e.g., extended reality (XR) , augmented reality (AR) , virtual reality (VR) ) , entertainment devices, and a personal digital assistant (PDA) .
  • XR extended reality
  • AR augmented reality
  • VR virtual reality
  • PDA personal digital assistant
  • a mobile apparatus may additionally be an “Internet of things” (IoT) or “Internet of everything” (IoE) device such as an automotive or other transportation vehicle, a satellite radio, a global positioning system (GPS) device, a logistics controller, a drone, a multi-copter, a quad-copter, a smart energy or security device, a solar panel or solar array, municipal lighting, water, or other infrastructure; industrial automation and enterprise devices; consumer and wearable devices, such as eyewear, a wearable camera, a smart watch, a health or fitness tracker, a mammal implantable device, gesture tracking device, medical device, a digital audio player (e.g., MP3 player) , a camera, a game console, etc.; and digital home or smart home devices such as a home audio, video, and multimedia device, an appliance, a sensor, a vending machine, intelligent lighting, a home security system, a smart meter, etc.
  • IoT Internet of things
  • IoE Internet of everything
  • a UE may be a device that includes a Universal Integrated Circuit Card (UICC) .
  • a UE may be a device that does not include a UICC.
  • UEs that do not include UICCs may also be referred to as IoE devices.
  • UEs 115a-115d of the embodiment illustrated in FIG. 1 are examples of mobile smart phone-type devices accessing wireless network 100
  • a UE 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
  • UEs 115e-115k illustrated in FIG. 1 are examples of various machines configured for communication that access wireless network 100.
  • a mobile apparatus such as UEs 115, may be able to communicate with any type of the base stations, whether macro base stations, pico base stations, femto base stations, relays, and the like.
  • a lightning bolt e.g., communication link
  • a serving base station which is a base station designated to serve the UE on the downlink and/or uplink, or desired transmission between base stations, and backhaul transmissions between base stations.
  • Backhaul communication between base stations of wireless network 100 may occur using wired and/or wireless communication links.
  • base stations 105a-105c serve UEs 115a and 115b using 3D beamforming and coordinated spatial techniques, such as coordinated multipoint (CoMP) or multi-connectivity.
  • Macro base station 105d performs backhaul communications with base stations 105a-105c, as well as small cell, base station 105f.
  • Macro base station 105d also transmits multicast services which are subscribed to and received by 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.
  • Wireless network 100 can support mission critical communications with ultra-reliable and redundant links for mission critical devices, such UE 115e, which is a drone. Redundant communication links with UE 115e include from macro base stations 105d and 105e, as well as small cell base station 105f.
  • UE 115f thermometer
  • UE 115g smart meter
  • UE 115h wearable device
  • Wireless network 100 may also provide additional network efficiency through dynamic, low-latency TDD/FDD communications, such as in a vehicle-to-vehicle (V2V) mesh network between UEs 115i-115k communicating with macro base station 105e.
  • V2V vehicle-to-vehicle
  • FIG. 2 shows a block diagram of a design of a base station 105 and a UE 115, which may be any of the base stations and one of the UEs in FIG. 1.
  • base station 105 may be small cell base station 105f in FIG. 1
  • UE 115 may be UE 115c or 115D operating in a service area of base station 105f, which in order to access small cell base station 105f, would be included in a list of accessible UEs for small cell base station 105f.
  • Base station 105 may also be a base station of some other type. As shown in FIG. 2, base station 105 may be equipped with antennas 234a through 234t, and UE 115 may be equipped with antennas 252a through 252r for facilitating wireless communications.
  • a transmit processor 220 may receive data from a data source 212 and control information from a controller/processor 240.
  • the control information may be for the physical broadcast channel (PBCH) , physical control format indicator channel (PCFICH) , physical hybrid-ARQ (automatic repeat request) indicator channel (PHICH) , physical downlink control channel (PDCCH) , enhanced physical downlink control channel (EPDCCH) , MTC physical downlink control channel (MPDCCH) , etc.
  • the data may be for the PDSCH, etc.
  • the transmit processor 220 may process (e.g., encode and symbol map) the data and control information to obtain data symbols and control symbols, respectively.
  • the transmit processor 220 may also generate reference symbols, e.g., for the primary synchronization signal (PSS) and secondary synchronization signal (SSS) , and cell-specific reference signal.
  • Transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, and/or the reference symbols, if applicable, and may provide output symbol streams to modulators (MODs) 232a through 232t. Each modulator 232 may process a respective output symbol stream (e.g., for OFDM, etc. ) to obtain an output sample stream.
  • TX multiple-input multiple-output
  • MIMO multiple-input multiple-output
  • Each modulator 232 may process a respective output symbol stream (e.g., for OFDM, etc. ) to obtain an output sample stream.
  • the antennas 252a through 252r may receive the downlink signals from the base station 105 and may provide received signals to the demodulators (DEMODs) 254a through 254r, respectively.
  • Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) a respective received signal to obtain input samples.
  • Each demodulator 254 may further process the input samples (e.g., for OFDM, etc. ) to obtain received symbols.
  • MIMO detector 256 may obtain received symbols from demodulators 254a through 254r, perform MIMO detection on the received symbols if applicable, and provide detected symbols.
  • a transmit processor 264 may receive and process data (e.g., for the physical uplink shared channel (PUSCH) ) from a data source 262 and control information (e.g., for the physical uplink control channel (PUCCH) ) from the controller/processor 280. Transmit processor 264 may also generate reference symbols for a reference signal. The symbols from the transmit processor 264 may be precoded by TX MIMO processor 266 if applicable, further processed by the modulators 254a through 254r (e.g., for SC-FDM, etc. ) , and transmitted to the base station 105.
  • data e.g., for the physical uplink shared channel (PUSCH)
  • control information e.g., for the physical uplink control channel (PUCCH)
  • PUCCH physical uplink control channel
  • the uplink signals from UE 115 may be received by antennas 234, processed by demodulators 232, detected by MIMO detector 236 if applicable, and further processed by receive processor 238 to obtain decoded data and control information sent by UE 115.
  • Receive processor 238 may provide the decoded data to data sink 239 and the decoded control information to controller/processor 240.
  • Controllers/processors 240 and 280 may direct the operation at base station 105 and UE 115, respectively. Controller/processor 240 and/or other processors and modules at base station 105 and/or controller/processor 280 and/or other processors and modules at UE 115 may perform or direct the execution of various processes for the techniques described herein, such as to perform or direct the execution illustrated in FIGS. 6 and 7, and/or other processes for the techniques described herein.
  • Memories 242 and 282 may store data and program codes for base station 105 and UE 115, respectively.
  • Scheduler 244 may schedule UEs for data transmission on the downlink and/or uplink.
  • a network operating entity may be allocated certain time resources reserved for exclusive communication by the network operating entity using the entirety of the shared spectrum.
  • the network operating entity may also be allocated other time resources where the entity is given priority over other network operating entities to communicate using the shared spectrum.
  • These time resources, prioritized for use by the network operating entity may be utilized by other network operating entities on an opportunistic basis if the prioritized network operating entity does not utilize the resources. Additional time resources may be allocated for any network operator to use on an opportunistic basis.
  • Access to the shared spectrum and the arbitration of time resources among different network operating entities may be centrally controlled by a separate entity, autonomously determined by a predefined arbitration scheme, or dynamically determined based on interactions between wireless nodes of the network operators.
  • a device may infer that a change in a received signal strength indicator (RSSI) of a power meter indicates that a channel is occupied.
  • RSSI received signal strength indicator
  • a CCA also may include detection of specific sequences that indicate use of the channel.
  • another device may transmit a specific preamble prior to transmitting a data sequence.
  • an LBT procedure may include a wireless node adjusting its own backoff window based on the amount of energy detected on a channel and/or the acknowledge/negative-acknowledge (ACK/NACK) feedback for its own transmitted packets as a proxy for collisions.
  • ACK/NACK acknowledge/negative-acknowledge
  • Precoding improves the reliability of messages on the downlink and the uplink.
  • One way to further improve the reliability of messages is to support subband precoding.
  • Subband precoding refers to precoding on the subband level, as compared to precoding on the wideband level.
  • the precoding matrix indicators (PMIs) of the fifth generation new radio (5G-NR) codebook are further grouped to support precoding of subbands.
  • Information related to the subband precoding may be shared with a user equipment (UE) via a two-stage downlink control information (DCI) transmission.
  • DCI downlink control information
  • a base station may transmit, to the UE, a first DCI transmission that indicates information corresponding to a wideband transmitted PMI (TPMI) .
  • TPMI wideband transmitted PMI
  • the base station may also transmit, to the UE, a second DCI transmission that indicates information corresponding to subband TPMIs.
  • the information in the second DCI transmission may indicate groupings of TPMIs to various subbands, as compared to a TPMI for wideband.
  • the UE may transmit, to the base station, data in accordance with the subband TPMIs.
  • uplink subband precoding may be supported between the UE and the base station. Enabling precoding at the subband level (e.g., at a finer granularity) may improve the speed and reliability of uplink data transmissions, thereby improving throughput and reducing latency in the wireless communication system.
  • FIG. 3 is a block diagram of an example wireless communications system 300 configured to support subband precoding.
  • wireless communications system 300 may implement aspects of wireless network 100.
  • wireless communications system 300 may include UE 115 and the base station 105. Although one UE and one base station are illustrated, in other implementations, wireless communications system 300 may include multiple UEs 115, multiple base stations 105, or both.
  • Transmitter 306 is configured to transmit data to one or more other devices
  • receiver 308 is configured to receive data from one or more other devices.
  • transmitter 306 may transmit data
  • receiver 318 may receive data, via a network, such as a wired network, a wireless network, or a combination thereof.
  • UE 115 may be configured to transmit or receive data via a direct device-to-device connection, a local area network (LAN) , a wide area network (WAN) , a modem-to-modem connection, the Internet, intranet, extranet, cable transmission system, cellular communication network, any combination of the above, or any other communications network now known or later developed within which permits two or more electronic devices to communicate.
  • transmitter 306 and receiver 308 may be replaced with a transceiver.
  • transmitter 306, receiver 308, or both may include or correspond to one or more components of UE 115 described with reference to FIG. 2.
  • Base station 105 can include a variety of components (e.g., structural, hardware components) used for carrying out one or more functions described herein.
  • these components can include processor 312, memory 314, transmitter 316, and receiver 318.
  • Processor 312 may be configured to execute instructions stored at memory 314 to perform the operations described herein.
  • processor 312 includes or corresponds to controller/processor 240, and memory 314 includes or corresponds to memory 242.
  • wireless communications system 300 includes a fifth generation (5G) network.
  • base station 105 may be a 5G base station (e.g., configured to operate in accordance with a 5G standard) .
  • UE 115 may include a 5G UE (e.g., a UE configured to operate in accordance with a 5G network) .
  • wideband TPMI information 322 may include or indicate the matrix values of one or more TPMIs.
  • First DCI transmission 320 also indicates a first modulation and coding scheme (MCS) 324.
  • MCS modulation and coding scheme
  • first DCI transmission 320 may include an indicator 325, as further described herein.
  • TPMI information are provided.
  • non-coherent TPMIs are given.
  • partial coherent TPMIs are given.
  • full coherent TPMIs are given.
  • the partial coherent TPMIs or the full coherent TPMIs are grouped. The groups can be divided based on the orthogonality between the TPMIs. For example, there may be four orthogonal groups with indices ⁇ 12, 14, 20, 22 ⁇ , ⁇ 13, 15, 21, 23 ⁇ , ⁇ 16, 18, 24, 26 ⁇ and ⁇ 17, 19, 25, 27 ⁇ .
  • a first option is to group non-orthogonal TPMIs in the same group.
  • a second option is to group orthogonal TPMIs in the same group.
  • a third option is to switch between the first option and the second option. For instance, some of the TPMIs can be orthogonal, and some of the TPMIs can be non-orthogonal.
  • a second DCI transmission may be used.
  • base station 105 transmits a second DCI transmission 326 to UE 115, and UE 115 receives second DCI transmission 326.
  • Second DCI transmission 326 indicates information, such as subband TPMI information 328, that corresponds to subband TPMIs.
  • Second DCI transmission 326 may also indicate second MCS 329, as further described herein.
  • Subband TPMI information 328 may indicate groupings of TPMIs, relations between TPMIs and subbands, and/or other information that enables subband precoding.
  • first DCI transmission 320 indicates the wideband TPMI in accordance with a wireless standard (e.g., the same as existing TPMI in the codebook) .
  • the wireless standard may be a 3GPP standard, as a non-limiting example.
  • second DCI transmission 326 may indicate a set of selected subband TPMIs from the wideband TPMI.
  • subband TPMI information 328 may indicate a group of TPMIs selected from the wideband TPMI. The group may be non-orthogonal TPMIs or orthogonal TPMIs, as non-limiting examples.
  • second DCI transmission 326 indicates a selected set of TPMIs from the group of TPMIs, or the set of TPMIs are selected based on pre-defined rules.
  • subband TPMI information 328 may indicate a correspondence between subbands and TPMIs of the group of TPMIs, such that a TPMI for a selected subband is indicated.
  • wideband index 12 may correspond to indices ⁇ 12, 13, 15, 16 ⁇
  • second DCI transmission 326 e.g., subband TPMI information 328
  • second DCI transmission 326 may be used to further select TPMIs within the group.
  • the subband TPMIs indicated by second DCI transmission 326 are subbands that overlap with resource allocation. For example, if an entire bandwidth (e.g., a wideband) includes four subbands subband 0, subband 1, subband 2, and subband 3, only the subbands which are allocated resources may be indicated by second DCI transmission 326. To illustrate, if resources are allocated to subband 0, subband 2, and subband 3, only those three subbands (and not subband 1) may have TPMIs indicated by second DCI transmission 326 (e.g., by subband TPMI information 328) . This example is provided for illustration only, and in other implementations, other numbers of subbands, and other subbands, may be allocated and indicated.
  • first DCI transmission 320 may indicate a first MCS and second DCI transmission 326 may indicate a second MCS.
  • first DCI transmission 320 may indicate first MCS 324
  • second DCI transmission 326 may indicate second MCS 329.
  • First MCS 324 may be different from second MCS 329.
  • second MCS 329 is a differential MCS.
  • second MCS 329 may only indicate an offset (e.g., a difference) between first MCS 324 and second MCS 329, when subband TPMI is enabled.
  • Transmitting a differential MCS may reduce the overall size of second DCI transmission 326 as compared to transmitting a full MCS indicator.
  • first DCI transmission 320 indicates the number of allocated resources, the number of subbands is derived accordingly, and the payload of second DCI transmission 326 (which is related to the number of subbands) is therefore derived, which can reduce blind decoding complexity at base station 105.
  • a subband size of the subbands corresponds to a resource allocation in first DCI transmission 320. Additionally, or alternatively, the subband size may correspond to a configured subband size from a radio resource control (RRC) message or higher layer signaling.
  • RRC radio resource control
  • a payload size of second DCI transmission 326 may also be based on the resource allocation, or other information within, first DCI transmission 320.
  • UE 115 may transmit data 330 to base station 105 in accordance with the subband TPMIs. For example, UE 115 may precode data 330 based on the subband (s) allocated to transmission of data 330. The precoding may be based on particular TPMIs indicated by second DCI transmission 326. Additionally, data 330 may be transmitted in accordance with second MCS 329.
  • Base station 105 may receive data 330 from UE 115 and perform blind decoding on data 330.
  • Blind decoding refers to attempting to decode data 330 based on multiple (e.g., different) MCSs because base station 105 does not have knowledge of which MCS was used by UE 115.
  • base station 105 may decode data 330 based on first MCS 324. If data 330 is decoded successfully based on first MCS 324, base station 105 determines that first MCS 324 was used by UE 115, and that second DCI transmission 326 may have failed decoding at UE 115.
  • base station 105 may decode data 330 based on second MCS 329. If data 330 is successfully decoded based on second MCS 329, base station 105 may determine that UE 115 successfully decoded second DCI transmission 326. Thus, if data 330 is successfully decoded using either first MCS 324 or second MCS 329, base station 105 identifies the MCS that was used by UE 115 (and potentially, whether or not one or more of first DCI transmission 320 and second DCI transmission 326 were successfully decoded at UE 115) .
  • base station 105 may configure different TPMIs for uplink precoding in the second two stage DCI transmission, but the same MCS from the first two stage DCI transmission (e.g., first DCI transmission 320 and second DCI transmission 326) may be used for retransmitting the data, even if one or both of the third and fourth DCI transmissions are decoded successfully.
  • first DCI transmission 320 and second DCI transmission 326 may be used for retransmitting the data, even if one or both of the third and fourth DCI transmissions are decoded successfully.
  • Base station 105 may receive, from UE 115, a retransmission of data 330 at a time indicated by the second scheduling information. Base station 105 may again perform blind decoding on the retransmission of data 330. For example, base station 105 may decode data 330 based on first MCS 324. If the decoding is successful, data 330 is processed, and base station 105 determines that second DCI transmission 326 was not decoded successfully at UE 115. If data 330 is not successfully decoded based on first MCS 324, base station 105 decodes data 330 based on second MCS 329. If the decoding is successful, data 330 is processed, and base station 105 determines that second DCI transmission 326 was decoded successfully at UE 115. If the decoding is unsuccessful, base station 105 schedules another transmission opportunity for UE 115.
  • UE 115 receives first DCI transmission 320 and second DCI transmission 326 and attempts to decode the respective DCI transmissions. As an example, UE 115 may successfully decode first DCI transmission 320 but unsuccessfully decode second DCI transmission 326. In this example, UE 115 transmits data 330 in accordance with wideband TPMI information 322 and first MCS 324. If base station 105 fails to decode data 330 using blind decoding, as described above, UE 115 receives, from base station 105, second scheduling information. The second scheduling information may be received as a second two-stage DCI transmission (e.g., a third DCI transmission and a fourth DCI transmission) .
  • the second scheduling information may be received as a second two-stage DCI transmission (e.g., a third DCI transmission and a fourth DCI transmission) .
  • UE 115 may retransmit data 330 to base station 105 during a time indicated by the second scheduling information.
  • Data 330 may be retransmitted in accordance with first MCS 324 in this example, because second DCI transmission 326 failed to decode, regardless of whether either the third or fourth DCI transmissions are successfully decoded.
  • UE 115 may successfully decode both first DCI transmission 320 and second DCI transmission 326. However, for other reasons, data 330 may not be successfully decoded at base station 105. Thus, UE 115 receives, from base station 105, second scheduling information. The second scheduling information may be received as a second two-stage DCI transmission (e.g., a third DCI transmission and a fourth DCI transmission) . UE 115 may retransmit data 330 to base station 105 during a time indicated by the second scheduling information. Data 330 may be retransmitted in accordance with second MCS 329 in this example, because second DCI transmission 326 was successfully decoded, regardless of whether either the third or fourth DCI transmissions are successfully decoded.
  • second MCS 329 in this example, because second DCI transmission 326 was successfully decoded, regardless of whether either the third or fourth DCI transmissions are successfully decoded.
  • first DCI transmission 320 includes indicator 325.
  • Indicator 325 corresponds to subband precoding and indicates that subband precoding is enabled.
  • Indicator 325 also indicates that there is a second DCI transmission (e.g., second DCI transmission 326) to be received at UE 115.
  • second DCI transmission e.g., second DCI transmission 326
  • UE 115 determines that an error has occurred. In such implementations, UE 115 will refrain from transmitting data 330 at the designated time. Refraining from transmitting data 330 will communicate to base station 105 that transmission of at least one of first DCI transmission 320 and second DCI transmission 326 has failed.
  • base station 105 monitors a wireless channel for data 330 from UE 115 at a time designated for data transmission. If base station 105 does not receive data 330 from UE 115 during the designated time, base station 105 determines that first DCI transmission 320 and/or second DCI transmission 326 has failed. In response to determining the failure, base station 105 may second a second two-stage DCI transmission (e.g., a third DCI transmission and a fourth DCI transmission) to UE 115 to trigger retransmission of data 330.
  • a second two-stage DCI transmission e.g., a third DCI transmission and a fourth DCI transmission
  • a single DCI transmission may include wideband TPMI information 322 and subband TPMI information 328.
  • the wideband TPMI e.g., wideband TPMI information 322
  • the payload size of the single DCI transmission may be dynamic.
  • the payload size may be based on a number of resources allocated in the DCI transmission.
  • the single DCI transmission may indicate a set of selected subband TPMIs from a group of TPMIs indicated by the single DCI transmission. Additionally, or alternatively, a number of subbands may correspond to a number of resources allocated in the DCI transmission.
  • FIG. 3 describes wireless communication system 300 that enables subband precoding.
  • base station 105 may transmit a two-stage DCI transmission including first DCI transmission 320 and second DCI transmission 326 to UE 115.
  • First DCI transmission 320 includes wideband TPMI information 322 that includes information about TPMIs for a wideband.
  • wideband TPMI information 322 may include information indicating groupings of TPMIs.
  • Second DCI transmission 326 includes subband TPMI information 328 that includes information about grouping TPMIs, and about specific TPMIs for subbands. Enabling UE 115 to use TPMIs for subbands that are allocated for data transmission improves the reliability and speed of the data transmissions, which increases throughput and decreases latency within wireless communication system 300.
  • Wireless communication system 400 includes base station 105 and UE 115.
  • FIG. 4 illustrates one example of communications between base station 105 and UE 115.
  • base station 105 transmits two DCI transmissions, a first DCI transmission ( “DCI-1” ) and a second DCI transmission ( “DCI-2” ) .
  • DCI-1 and DCI-2 may include or correspond to first DCI transmission 320 and second DCI transmission 326, respectively.
  • DCI-1 is successfully received and decoded at UE 115.
  • DCI-2 is unsuccessfully received and decoded at UE 115 (as indicated by the hatching lines of DCI-2) .
  • DCI-2 is not successfully decoded, information about a second MCS is not received by UE 115.
  • uplink data sent via the physical uplink shared channel (PUSCH) is sent in accordance with a first MCS indicated by DCI-1.
  • reception of the data fails at base station 105.
  • base station 105 schedules a second transmission time.
  • base station 105 transmits a second set of DCI transmissions to UE 115.
  • UE 115 successfully receives and decodes the second set of DCI transmissions.
  • UE 115 transmits the uplink data (via the PUSCH) in accordance with the MCS of the first DCI transmission in the first set of transmissions, regardless of the successful decoding of the second set of DCI transmissions.
  • the data may be transmit in accordance with the subband TPMIs indicated by the fourth DCI transmission. This enables base station 105 to successfully decode the received data.
  • Wireless communication system 500 includes base station 105 and UE 115.
  • FIG. 5 illustrates one example of communications between base station 105 and UE 115.
  • base station 105 transmits two DCI transmissions, a first DCI transmission ( “DCI-1” ) and a second DCI transmission ( “DCI-2” ) .
  • DCI-1 and DCI-2 may include or correspond to first DCI transmission 320 and second DCI transmission 326, respectively.
  • DCI-1 is successfully received and decoded at UE 115.
  • DCI-2 is also successfully received and decoded at UE 115. Because DCI-2 is successfully decoded, information about a second MCS is received by UE 115. Thus, uplink data sent via the PUSCH is sent in accordance with the second MCS indicated by DCI-2.
  • reception of the data fails at base station 105.
  • base station 105 schedules a second transmission time.
  • base station 105 transmits a second set of DCI transmissions to UE 115.
  • UE 115 successfully receives and decodes the first DCI transmission of the second set of DCI transmissions.
  • UE 115 does not successfully receive the second DCI transmission of the second set of DCI transmissions (as indicated by the hatch lines) .
  • UE 115 transmits the uplink data (via the PUSCH) in accordance with the second MCS of the second DCI transmission in the first set of transmissions, regardless of the successful decoding of one or more of the second set of DCI transmissions.
  • the data is transmitted in accordance with TPMIs indicated by the third DCI transmission. This enables base station 105 to successfully decode the received data.
  • FIG. 6 is a block diagram illustrating example blocks executed to implement one aspect of the present disclosure. The example blocks will also be described with respect to UE 115 as illustrated in FIG. 8.
  • FIG. 8 is a block diagram illustrating UE 115 configured according to one aspect of the present disclosure.
  • UE 115 includes the structure, hardware, and components as illustrated for UE 115 of FIG. 2.
  • controller/processor 280 which operates to execute logic or computer instructions stored in memory 282, as well as controlling the components of UE 115 that provide the features and functionality of UE 115.
  • UE 115 under control of controller/processor 280, transmits and receives signals via wireless radios 801a-r and antennas 252a-r.
  • Wireless radios 801a-r includes various components and hardware, as illustrated in FIG. 2 for UE 115, including modulator/demodulators 254a-r, MIMO detector 256, receive processor 258, transmit processor 264, and TX MIMO processor 266.
  • the UE receives, from a base station, a first downlink control information (DCI) transmission indicating information corresponding to a wideband transmitted precoding matrix indicator (TPMI) .
  • the UE 115 may execute, under control of controller/processor 280, DCI receiving logic 802 stored in memory 282.
  • the execution environment of DCI receiving logic 802 provides the functionality to receive a first DCI transmission from the base station.
  • the first DCI transmission includes wideband TPMI information 803, which in some implementations includes or corresponds to wideband TPMI information 322 of FIG. 3.
  • Wideband TPMI information 803 includes information corresponding to wideband TPMIs.
  • the UE receives, from the base station, a second DCI transmission indicating information corresponding to subband TPMIs.
  • the UE 115 may execute, under control of controller/processor 280, DCI receiving logic 802 stored in memory 282.
  • the execution environment of DCI receiving logic 802 provides the functionality to receive a second DCI transmission from the base station.
  • the second DCI transmission includes subband TPMI information 804, which in some implementations includes or corresponds to subband TPMI information 328 of FIG. 3.
  • Subband TPMI information 804 includes information that indicates groups of TPMIs and/or divides the groups of TPMIs into TPMIs allocated to various subbands.
  • the UE transmits, to the base station, data in accordance with the subband TPMIs.
  • the UE 115 may execute, under control of controller/processor 280, data transmission logic 805.
  • the execution environment of data transmission logic 805 provides the functionality to transmit data, to the base station, in accordance with the subband TPMIs.
  • the data may be transmit in accordance with subband TPMI information 804.
  • the first DCI transmission also includes first MCS 806, and the second DCI transmission also includes second MCS 807.
  • second MCS 807 is a differential MCS of first MCS 806. If only the first DCI transmission is successfully received and decoded, the data may be transmit to the base station in accordance with first MCS 806. If the second DCI transmission is successfully received and decoded, the data may be transmitted to the base station in accordance with second MCS 807.
  • FIG. 7 is a block diagram illustrating example blocks executed to implement one aspect of the present disclosure.
  • the example blocks will also be described with respect to base station 105 as illustrated in FIG. 9.
  • FIG. 9 is a block diagram illustrating base station 105 configured according to one aspect of the present disclosure.
  • Base station 105 includes the structure, hardware, and components as illustrated for base station 105 of FIG. 2.
  • base station 105 includes controller/processor 240, which operates to execute logic or computer instructions stored in memory 242, as well as controlling the components of base station 105 that provide the features and functionality of base station 105.
  • Base station 105 under control of controller/processor 240, transmits and receives signals via wireless radios 901a-t and antennas 234a-t.
  • Wireless radios 901a-t includes various components and hardware, as illustrated in FIG. 2 for base station 105, including modulator/demodulators 232a-t, MIMO detector 236, receive processor 238, transmit processor 220, and TX MIMO processor 230.
  • a base station transmits, to a UE, a first downlink control information (DCI) transmission indicating information corresponding to a wideband transmitted precoding matrix indicator (TPMI) .
  • Base station 105 may execute, under control of controller/processor 240, DCI transmission logic 902 stored in memory 242.
  • the execution environment of DCI transmission logic 902 provides the functionality to transmit a first DCI transmission to the UE.
  • the first DCI transmission includes wideband TPMI information 903, which in some implementations includes or corresponds to wideband TPMI information 322 of FIG. 3.
  • Wideband TPMI information 903 includes information corresponding to wideband TPMIs.
  • the base station transmits, to the UE, a second DCI transmission indicating information corresponding to subband TPMIs.
  • Base station 105 may execute, under control of controller/processor 240, DCI transmission logic 902 stored in memory 242.
  • the execution environment of DCI transmission logic 902 provides the functionality to transmit a second DCI transmission to the UE.
  • the second DCI transmission includes subband TPMI information 904, which in some implementations includes or corresponds to subband TPMI information 328 of FIG. 3.
  • Subband TPMI information 904 includes information that indicates groups of TPMIs and/or divides the groups of TPMIs into TPMIs allocated to various subbands.
  • a wireless communication system may support subband precoding.
  • a base station may transmit a two-stage DCI transmission.
  • a first DCI transmission includes or indicates information about TPMIs for a wideband.
  • the wideband TPMI information may include information indicating groupings of TPMIs.
  • a second DCI transmission includes or indicates information about grouping TPMIs, and about specific TPMIs for subbands. Enabling a UE to use TPMIs for subbands that are allocated for data transmission improves the reliability and speed of the data transmissions, which increases throughput and decreases latency within wireless communication system.
  • the first DCI transmission also includes first MCS 905, and the second DCI transmission also includes second MCS 906.
  • second MCS 906 is a differential MCS of first MCS 905.
  • Base station 105 may blindly decode data received from the UE based on first MCS 905 and/or second MCS 906. For example, base station 105 may first attempt to decode the data based on first MCS 905. If the decoding fails, base station 105 may attempt to decode the data based on second MCS 906. Thus, if at least one of the first DCI transmission and the second DCI transmission is successfully received and decoded at the UE, the data should be decodable at base station 105 through blind decoding.
  • a UE may receive, from a base station, a first downlink control information (DCI) transmission indicating information corresponding to a wideband transmitted precoding matrix indicator (TPMI) .
  • DCI downlink control information
  • TPMI wideband transmitted precoding matrix indicator
  • the UE may receive, from the base station, a second DCI transmission indicating information corresponding to subband TPMIs.
  • the UE may transmit, to the base station, data in accordance with the subband TPMIs.
  • the first DCI transmission indicates the wideband TPMI in accordance with a wireless standard.
  • a group of TPMIs is associated with the wideband TPMI.
  • the first DCI transmission includes group information of a group of TPMIs from the wideband TPMI.
  • the second DCI transmission indicates a set of selected subband TPMIs of the group of TPMIs.
  • the a subband size corresponds to a resource allocation in the first DCI transmission and a configured subband size from a radio resource control (RRC) message or higher layer signaling.
  • RRC radio resource control
  • the first DCI transmission indicates a first modulation and coding scheme (MCS)
  • MCS modulation and coding scheme
  • the UE successfully decodes the first DCI transmission, the UE unsuccessfully decodes the second DCI transmission, the UE receives, from the base station, second scheduling information, and the UE transmits, to the base station, the data during a time indicated by the second scheduling information in accordance with a modulation and coding scheme (MCS) indicated by the first DCI transmission.
  • MCS modulation and coding scheme
  • the UE successfully decodes the first DCI transmission, the UE successfully decodes the second DCI transmission, the UE receives, from the base station, second scheduling information, and the UE transmits, to the base station, the data during a time indicated by the second scheduling information in accordance with a modulation and coding scheme (MCS) indicated by the second DCI transmission.
  • MCS modulation and coding scheme
  • the first DCI transmission includes an indicator, the indicator corresponding to subband precoding.
  • configuration and/or use of subband TPMIs may include a base station transmitting, to a user equipment (UE) , a first downlink control information (DCI) transmission indicating information corresponding to a wideband transmitted precoding matrix indicator (TPMI) .
  • DCI downlink control information
  • TPMI wideband transmitted precoding matrix indicator
  • Configuration and/or use of subband TPMIs may also include the base station transmitting, to the UE, a second DCI transmission indicating information corresponding to subband TPMIs.
  • the first DCI transmission indicates the wideband TPMI in accordance with a wireless standard.
  • a group of TPMIs is associated with the wideband TPMI.
  • the second DCI transmission indicates a set of selected subband TPMIs from the group of TPMIs.
  • the first DCI transmission includes group information of a group of TPMIs from the wideband TPMI.
  • the first DCI transmission indicates a first modulation and coding scheme (MCS)
  • MCS modulation and coding scheme
  • the base station transmits, to the UE, second scheduling information to the base station based on unsuccessful decoding of the data based on the second MCS.
  • the base station receives, from the UE, the data during a time indicated by the second scheduling information and decodes the data based on the first MCS.
  • the base station based on failing to decode the data based on the first MCS, decodes the data based on the second MCS.
  • the first DCI transmission includes an indicator, the indicator corresponding to subband precoding.
  • the base station monitors a wireless channel for data from the UE at a time indicated by the first DCI transmission and determines that either the first DCI transmission or the second DCI transmission was unsuccessfully decoded at the UE based on failure to receive the data during the time.
  • configuration and/or use of subband TPMIs may include a user equipment (UE) receiving, from a base station, a downlink control information (DCI) transmission indicating first information corresponding to a wideband transmitted precoding matrix indicator (TPMI) and second information corresponding to subband TPMIs.
  • DCI downlink control information
  • the UE may transmit, to the base station, data in accordance with the subband TPMIs.
  • the DCI transmission indicates the wideband TPMI in accordance with a wireless standard.
  • a payload size of the DCI transmission is dynamic based on a number of resources allocated in the DCI transmission.
  • a number of subbands corresponds to a number of resources allocated in the DCI transmission.
  • the functional blocks and modules described herein may comprise processors, electronics devices, hardware devices, electronics components, logical circuits, memories, software codes, firmware codes, etc., or any combination thereof.
  • features discussed herein relating to FIGS. 1-9 may be implemented via specialized processor circuitry, via executable instructions, and/or combinations thereof.
  • a processor 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.
  • a software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
  • An exemplary storage medium is coupled to the processor such that the processor can read information from, and write information to, the storage medium.
  • the storage medium may be integral to the processor.
  • the processor and the storage medium may reside in an ASIC.
  • the ASIC may reside in a user terminal.
  • the processor and the storage medium may reside as discrete components in a user terminal.
  • the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium.
  • Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. Computer-readable storage media may be any available media that can be accessed by a general purpose or special purpose computer.
  • such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code means in the form of instructions or data structures and that can be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor.
  • a connection may be properly termed a computer-readable medium.
  • the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, or digital subscriber line (DSL) , then the coaxial cable, fiber optic cable, twisted pair, or DSL, are included in the definition of medium.
  • DSL digital subscriber line
  • Disk and disc includes compact disc (CD) , laser disc, optical disc, digital versatile disc (DVD) , hard disk, solid state disk, and blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.
  • the term “and/or, ” when used in a list of two or more items means that any one of the listed items can be employed by itself, or any combination of two or more of the listed items can be employed.
  • the composition can contain A alone; B alone; C alone; A and B in combination; A and C in combination; B and C in combination; or A, B, and C in combination.

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  • Mobile Radio Communication Systems (AREA)

Abstract

Dans un mode de réalisation particulier, un procédé de communication sans fil consiste à recevoir, au niveau d'un équipement utilisateur (UE) en provenance d'une station de base, une première transmission d'informations de commande de liaison descendante (DCI) indiquant des informations correspondant à un indicateur de matrice de précodage transmis (TPMI) à large bande. Le procédé consiste également à recevoir, au niveau de l'UE en provenance de la station de base, une seconde transmission de DCI indiquant des informations correspondant à des TPMI de sous-bande. Le procédé consiste en outre à transmettre, de l'UE à la station de base, des données en fonction des TPMI de sous-bande.
PCT/CN2019/125089 2019-12-13 2019-12-13 Regroupement de précodeur de liaison montante et rétroaction de tpmi pour précodage de sous-bande WO2021114215A1 (fr)

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CN110100394A (zh) * 2016-12-22 2019-08-06 三星电子株式会社 用于高级无线通信的上行链路多输入多输出码本
WO2019203619A1 (fr) * 2018-04-19 2019-10-24 Samsung Electronics Co., Ltd Contrôle de puissance de liaison montante pour systèmes de communications sans fil évolués

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CN110100394A (zh) * 2016-12-22 2019-08-06 三星电子株式会社 用于高级无线通信的上行链路多输入多输出码本
US20190097710A1 (en) * 2017-09-07 2019-03-28 Lg Electronics Inc. Method for transmitting a uplink signal based on a codebook in a wireless communication system and apparatus therefor
CN111052621A (zh) * 2017-09-07 2020-04-21 Lg电子株式会社 在无线通信系统中基于码本发送上行链路信号的方法及其装置
WO2019203619A1 (fr) * 2018-04-19 2019-10-24 Samsung Electronics Co., Ltd Contrôle de puissance de liaison montante pour systèmes de communications sans fil évolués

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