WO2019153224A1 - Commutation dynamique entre des transmissions de liaison montante non basées sur un livre de codes et basées sur un livre de codes - Google Patents

Commutation dynamique entre des transmissions de liaison montante non basées sur un livre de codes et basées sur un livre de codes Download PDF

Info

Publication number
WO2019153224A1
WO2019153224A1 PCT/CN2018/075933 CN2018075933W WO2019153224A1 WO 2019153224 A1 WO2019153224 A1 WO 2019153224A1 CN 2018075933 W CN2018075933 W CN 2018075933W WO 2019153224 A1 WO2019153224 A1 WO 2019153224A1
Authority
WO
WIPO (PCT)
Prior art keywords
transmission configuration
transmission
configuration
switch
indication
Prior art date
Application number
PCT/CN2018/075933
Other languages
English (en)
Inventor
Chenxi HAO
Yu Zhang
Wanshi Chen
Peter Gaal
Alexandros MANOLAKOS
Joseph Binamira Soriaga
Chao Wei
Original Assignee
Qualcomm Incorporated
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Qualcomm Incorporated filed Critical Qualcomm Incorporated
Priority to PCT/CN2018/075933 priority Critical patent/WO2019153224A1/fr
Publication of WO2019153224A1 publication Critical patent/WO2019153224A1/fr

Links

Images

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0091Signaling for the administration of the divided path
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413MIMO systems
    • H04B7/0456Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0689Hybrid systems, i.e. switching and simultaneous transmission using different transmission schemes, at least one of them being a diversity transmission scheme
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0001Arrangements for dividing the transmission path
    • H04L5/0014Three-dimensional division
    • H04L5/0023Time-frequency-space
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal

Definitions

  • aspects of the present disclosure relate generally to wireless communications systems, and more particularly, to techniques for dynamically switching between non-codebook based uplink transmission resources and codebook based uplink transmission resources.
  • Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts.
  • Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power) .
  • multiple-access technologies include Long Term Evolution (LTE) systems, code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems.
  • LTE Long Term Evolution
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single-carrier frequency division multiple access
  • TD-SCDMA time division synchronous code division multiple access
  • a wireless multiple-access communication system may include a number of base stations, each simultaneously supporting communication for multiple communication devices, otherwise known as user equipment (UEs) .
  • UEs user equipment
  • a set of one or more base stations may define an e NodeB (eNB) .
  • eNB e NodeB
  • a wireless multiple access communication system may include a number of distributed units (DUs) (e.g., edge units (EUs) , edge nodes (ENs) , radio heads (RHs) , smart radio heads (SRHs) , transmission reception points (TRPs) , etc.
  • DUs distributed units
  • EUs edge units
  • ENs edge nodes
  • RHs radio heads
  • SSRHs smart radio heads
  • TRPs transmission reception points
  • CUs central units
  • CUs central units
  • CNs central nodes
  • ANCs access node controllers
  • a set of one or more distributed units, in communication with a central unit may define an access node (e.g., a new radio base station (NR BS) , a new radio node-B (NR NB) , a network node, 5G NB, gNB, etc. ) .
  • NR BS new radio base station
  • NR NB new radio node-B
  • 5G NB 5G NB
  • gNB network node
  • a base station or DU may communicate with a set of UEs on downlink channels (e.g., for transmissions from a base station or to a UE) and uplink channels (e.g., for transmissions from a UE to a base station or distributed unit) .
  • downlink channels e.g., for transmissions from a base station or to a UE
  • uplink channels e.g., for transmissions from a UE to a base station or distributed unit
  • NR new radio
  • 3GPP Third Generation Partnership Project
  • Certain aspects of the present disclosure provide a method for wireless communication that may be performed, for example, by a base station (BS) .
  • the method generally includes transmitting a signal to a user equipment (UE) indicating to the UE to transmit uplink (UL) signals using a first UL transmission configuration and receiving an UL signal from the UE according to the first UL transmission configuration.
  • the method also includes determining whether to switch from the first UL transmission configuration to a second UL transmission configuration based on the received UL signal and transmitting an indication of whether to switch from the first UL transmission configuration to the second UL transmission configuration to the UE.
  • Certain aspects of the present disclosure provide a method for wireless communication that may be performed, for example, by a user equipment (UE) .
  • the method generally includes receiving a signal, from a base station (BS) , indicating an UL transmission is to be based on a first uplink (UL) transmission configuration and transmitting an UL signal to the BS using the first UL transmission configuration.
  • the method also includes receiving, from the BS, an UL transmission configuration switching indication, determining whether to switch from the first UL transmission configuration to a second UL transmission configuration based on the received indication, and transmitting UL signals to the BS based on the determination.
  • the apparatus generally includes an interface configured to output a signal to a user equipment (UE) indicating to the UE to transmit uplink (UL) signals using a first UL transmission configuration and output an indication of whether to switch from the first UL transmission configuration to the second UL transmission configuration to the UE.
  • the apparatus also includes a processing system configured to determine whether to switch from the first UL transmission configuration to a second UL transmission configuration based on the received UL signal.
  • the apparatus generally includes an interface configured to receive a signal, from a base station (BS) , indicating the UL transmission is to be based on a first uplink (UL) transmission configuration, receive an UL transmission configuration switching indication, from the BS, and output UL signals to the BS based on a determination of whether to switch from the first UL transmission configuration to a second UL transmission configuration based on the received indication.
  • the apparatus also includes a processing system configured to determine whether to switch from the first UL transmission configuration to a second UL transmission configuration based on the received indication.
  • the apparatus generally includes means for transmitting a signal to a user equipment (UE) indicating to the UE to transmit uplink (UL) signals using a first UL transmission configuration, means for receiving an UL signal from the UE according to the first UL transmission configuration, means for determining whether to switch from the first UL transmission configuration to a second UL transmission configuration based on the received UL signal, and means for transmitting an indication of whether to switch from the first UL transmission configuration to the second UL transmission configuration to the UE.
  • UE user equipment
  • UL uplink
  • the apparatus generally includes means for receiving a signal, from a base station (BS) , indicating an UL transmission is to be based on a first uplink (UL) transmission configuration, means for transmitting an UL signal to the BS using the first UL transmission configuration, means for receiving, from the BS, an UL transmission configuration switching indication, means for determining whether to switch from the first UL transmission configuration to a second UL transmission configuration based on the received indication, and means for transmitting UL signals to the BS based on the determination.
  • BS base station
  • UL uplink
  • the computer readable medium generally includes code that, when executed by at least one processor, causes the at least one processor to transmit a signal to a user equipment (UE) indicating to the UE to transmit uplink (UL) signals using a first UL transmission configuration, receive an UL signal from the UE according to the first UL transmission configuration, determine whether to switch from the first UL transmission configuration to a second UL transmission configuration based on the received UL signal, and transmit an indication of whether to switch from the first UL transmission configuration to the second UL transmission configuration to the UE.
  • UE user equipment
  • UL uplink
  • the computer readable medium generally includes code that, when executed by at least one processor, causes the at least one processor to receive a signal, from a base station (BS) , indicating an UL transmission is to be based on a first uplink (UL) transmission configuration, transmit an UL signal to the BS using the first UL transmission configuration, receive, from the BS, an UL transmission configuration switching indication, determine whether to switch from the first UL transmission configuration to a second UL transmission configuration based on the received indication, and transmit UL signals to the BS based on the determination.
  • BS base station
  • UL uplink
  • the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims.
  • the following description and the annexed drawings set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed, and this description is intended to include all such aspects and their equivalents.
  • FIG. 1 is a block diagram conceptually illustrating an example telecommunications system, in accordance with certain aspects of the present disclosure.
  • FIG. 2 is a block diagram illustrating an example logical architecture of a distributed RAN, in accordance with certain aspects of the present disclosure.
  • FIG. 3 is a diagram illustrating an example physical architecture of a distributed RAN, in accordance with certain aspects of the present disclosure.
  • FIG. 4 is a block diagram conceptually illustrating a design of an example BS and user equipment (UE) , in accordance with certain aspects of the present disclosure.
  • FIG. 5 is a diagram showing examples for implementing a communication protocol stack, in accordance with certain aspects of the present disclosure.
  • FIG. 6 illustrates an example of a DL-centric subframe, in accordance with certain aspects of the present disclosure.
  • FIG. 7 illustrates an example of an UL-centric subframe, in accordance with certain aspects of the present disclosure.
  • FIG. 8 is a flow diagram illustrating example operations that may be performed by a BS, in accordance with certain aspects of the present disclosure.
  • FIG. 9 is a flow diagram illustrating example operations that may be performed by a UE, in accordance with certain aspects of the present disclosure.
  • FIG. 10 illustrates a block diagram of an example wireless communications device, in accordance with certain aspects of the present disclosure.
  • NR new radio access technology or 5G technology
  • NR may support various wireless communication services, such as Enhanced mobile broadband (eMBB) targeting wide bandwidth (e.g. 80 MHz beyond) , millimeter wave (mmW) targeting high carrier frequency (e.g. 60 GHz) , massive MTC (mMTC) targeting non-backward compatible MTC techniques, and/or mission critical targeting ultra-reliable low latency communications (URLLC) .
  • eMBB Enhanced mobile broadband
  • mmW millimeter wave
  • mMTC massive MTC
  • URLLC ultra-reliable low latency communications
  • These services may include latency and reliability requirements.
  • TTI transmission time intervals
  • QoS quality of service
  • these services may co-exist in the same subframe.
  • aspects of the present disclosure provide techniques and apparatus for dynamic switching between non-codebook and codebook based uplink transmission schemes.
  • a CDMA network may implement a radio technology such as Universal Terrestrial Radio Access (UTRA) , cdma2000, etc.
  • UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA.
  • cdma2000 covers IS-2000, IS-95 and IS-856 standards.
  • a TDMA network may implement a radio technology such as Global System for Mobile Communications (GSM) .
  • An OFDMA network may implement a radio technology such as NR (e.g.
  • E-UTRA Evolved UTRA
  • UMB Ultra Mobile Broadband
  • IEEE 802.11 Wi-Fi
  • IEEE 802.16 WiMAX
  • IEEE 802.20 Flash-OFDMA
  • UMTS Universal Mobile Telecommunication System
  • NR is an emerging wireless communications technology under development in conjunction with the 5G Technology Forum (5GTF) .
  • 3GPP Long Term Evolution (LTE) and LTE-Advanced (LTE-A) are releases of UMTS that use E-UTRA.
  • UTRA, E-UTRA, UMTS, LTE, LTE-A and GSM are described in documents from an organization named “3rd Generation Partnership Project” (3GPP) .
  • cdma2000 and UMB are described in documents from an organization named “3rd Generation Partnership Project 2” (3GPP2) .
  • the techniques described herein may be used for the wireless networks and radio technologies mentioned above as well as other wireless networks and radio technologies. For clarity, while aspects may be described herein using terminology commonly associated with 3G and/or 4G wireless technologies, aspects of the present disclosure can be applied in other generation-based communication systems, such as 5G and later, including NR technologies.
  • FIG. 1 illustrates an example wireless network 100 in which aspects of the present disclosure may be performed.
  • the wireless network may be a new radio (NR) or 5G network.
  • BS 110 may receive an uplink (UL) signal from UE 120 according to a first UL transmission configuration and determine whether to switch from the first UL transmission configuration to a second UL transmission configuration based on the received UL signal.
  • BS 110 may transmit an indication of whether to switch from the first UL transmission configuration to the second UL transmission configuration to UE 120 to facilitate dynamic switching between non-codebook and codebook based UL transmissions as further described herein with respect to FIGs. 8 and 9.
  • the wireless network 100 may include a number of BSs 110 and other network entities.
  • a BS may be a station that communicates with UEs.
  • Each BS 110 may provide communication coverage for a particular geographic area.
  • the term “cell” can refer to a coverage area of a Node B and/or a Node B subsystem serving this coverage area, depending on the context in which the term is used.
  • the term “cell” and gNB, Node B, 5G NB, AP, NR BS, NR BS, or TRP may be interchangeable.
  • a cell may not necessarily be stationary, and the geographic area of the cell may move according to the location of a mobile base station.
  • the base stations may be interconnected to one another and/or to one or more other base stations or network nodes (not shown) in the wireless network 100 through various types of backhaul interfaces such as a direct physical connection, a virtual network, or the like using any suitable transport network.
  • any number of wireless networks may be deployed in a given geographic area.
  • Each wireless network may support a particular radio access technology (RAT) and may operate on one or more frequencies.
  • a RAT may also be referred to as a radio technology, an air interface, etc.
  • a frequency may also be referred to as a carrier, a frequency channel, etc.
  • Each frequency may support a single RAT in a given geographic area in order to avoid interference between wireless networks of different RATs.
  • NR or 5G RAT networks may be deployed.
  • a BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and/or other types of cell.
  • a macro cell may cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscription.
  • a pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscription.
  • a femto cell may cover a relatively small geographic area (e.g., a home) and may allow restricted access by UEs having association with the femto cell (e.g., UEs in a Closed Subscriber Group (CSG) , UEs for users in the home, etc. ) .
  • CSG Closed Subscriber Group
  • a BS for a macro cell may be referred to as a macro BS.
  • a BS for a pico cell may be referred to as a pico BS.
  • a BS for a femto cell may be referred to as a femto BS or a home BS.
  • the BSs 110a, 110b and 110c may be macro BSs for the macro cells 102a, 102b and 102c, respectively.
  • the BS 110x may be a pico BS for a pico cell 102x.
  • the BSs 110y and 110z may be femto BS for the femto cells 102y and 102z, respectively.
  • a BS may support one or multiple (e.g., three) cells.
  • the wireless network 100 may also include relay stations.
  • a relay station is a station that receives a transmission of data and/or other information from an upstream station (e.g., a BS or a UE) and sends a transmission of the data and/or other information to a downstream station (e.g., a UE or a BS) .
  • a relay station may also be a UE that relays transmissions for other UEs.
  • a relay station 110r may communicate with the BS 110a and a UE 120r in order to facilitate communication between the BS 110a and the UE 120r.
  • a relay station may also be referred to as a relay BS, a relay, etc.
  • the wireless network 100 may be a heterogeneous network that includes BSs of different types, e.g., macro BS, pico BS, femto BS, relays, etc. These different types of BSs may have different transmit power levels, different coverage areas, and different impact on interference in the wireless network 100.
  • BSs of different types
  • a macro BS may have a high transmit power level (e.g., 20 Watts)
  • pico BS, femto BS, and relays may have a lower transmit power level (e.g., 1 Watt) .
  • the wireless 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 techniques described herein may be used for both synchronous and asynchronous operation.
  • a network controller 130 may couple to a set of BSs and provide coordination and control for these BSs.
  • the network controller 130 may communicate with the BSs 110 via a backhaul.
  • the BSs 110 may also communicate with one another, e.g., directly or indirectly via wireless or wireline backhaul.
  • the UEs 120 may be dispersed throughout the wireless network 100, and each UE may be stationary or mobile.
  • a UE may also be referred to as a mobile station, a terminal, an access terminal, a subscriber unit, a station, a Customer Premises Equipment (CPE) , a cellular phone, a smart phone, a personal digital assistant (PDA) , a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or medical equipment, a biometric sensor/device, a wearable device such as a smart watch, smart clothing, smart glasses, a smart wrist band, smart jewelry (e.g., a smart ring, a smart bracelet, etc.
  • MTC machine-type communication
  • eMTC evolved MTC
  • MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc., that may communicate with a BS, another device (e.g., remote device) , or some other entity.
  • a wireless node may provide, for example, connectivity for or to a network (e.g., a wide area network such as Internet or a cellular network) via a wired or wireless communication link.
  • a network e.g., a wide area network such as Internet or a cellular network
  • Some UEs may be considered Internet-of-Things (IoT) devices.
  • IoT Internet-of-Things
  • a solid line with double arrows indicates desired transmissions between a UE and a serving BS, which is a BS designated to serve the UE on the downlink and/or uplink.
  • a finely dashed line with double arrows indicates interfering transmissions between a UE and a BS.
  • Certain wireless networks utilize orthogonal frequency division multiplexing (OFDM) on the downlink and single-carrier frequency division multiplexing (SC-FDM) on the uplink.
  • OFDM and SC-FDM partition the system bandwidth into multiple (K) orthogonal subcarriers, which are also commonly referred to as tones, bins, etc.
  • K orthogonal subcarriers
  • Each subcarrier may be modulated with data.
  • modulation symbols are sent in the frequency domain with OFDM and in the time domain with SC-FDM.
  • the spacing between adjacent subcarriers may be fixed, and the total number of subcarriers (K) may be dependent on the system bandwidth.
  • the spacing of the subcarriers may be 15 kHz and the minimum resource allocation (called a ‘resource block’ ) may be 12 subcarriers (or 180 kHz) . Consequently, the nominal FFT size may be equal to 128, 256, 512, 1024 or 2048 for system bandwidth of 1.25, 2.5, 5, 10 or 20 megahertz (MHz) , respectively.
  • the system bandwidth may also be partitioned into subbands. For example, a subband may cover 1.08 MHz (i.e., 6 resource blocks) , and there may be 1, 2, 4, 8 or 16 subbands for system bandwidth of 1.25, 2.5, 5, 10 or 20 MHz, respectively.
  • aspects of the examples described herein may be associated with LTE technologies, aspects of the present disclosure may be applicable with other wireless communications systems, such as NR.
  • NR may utilize OFDM with a CP on the uplink and downlink and include support for half-duplex operation using TDD.
  • a single component carrier bandwidth of 100 MHz may be supported.
  • NR resource blocks may span 12 sub-carriers with a sub-carrier bandwidth of 75 kHz over a 0.1 ms duration.
  • Each radio frame may consist of 50 subframes with a length of 10 ms. Consequently, each subframe may have a length of 0.2 ms.
  • Each subframe may indicate a link direction (i.e., DL or UL) for data transmission and the link direction for each subframe may be dynamically switched.
  • Each subframe may include DL/UL data as well as DL/UL control data.
  • UL and DL subframes for NR may be as described in more detail below with respect to FIGs. 6 and 7.
  • Beamforming may be supported and beam direction may be dynamically configured.
  • MIMO transmissions with precoding may also be supported.
  • MIMO configurations in the DL may support up to 8 transmit antennas with multi-layer DL transmissions up to 8 streams and up to 2 streams per UE.
  • Multi-layer transmissions with up to 2 streams per UE may be supported.
  • Aggregation of multiple cells may be supported with up to 8 serving cells.
  • NR may support a different air interface, other than an OFDM-based.
  • NR networks may include entities such CUs and/or DUs.
  • a scheduling entity e.g., a base station
  • the scheduling entity may be responsible for scheduling, assigning, reconfiguring, and releasing resources for one or more subordinate entities. That is, for scheduled communication, subordinate entities utilize resources allocated by the scheduling entity.
  • Base stations are not the only entities that may function as a scheduling entity. That is, in some examples, a UE may function as a scheduling entity, scheduling resources for one or more subordinate entities (e.g., one or more other UEs) .
  • the UE is functioning as a scheduling entity, and other UEs utilize resources scheduled by the UE for wireless communication.
  • a UE may function as a scheduling entity in a peer-to-peer (P2P) network, and/or in a mesh network.
  • P2P peer-to-peer
  • UEs may optionally communicate directly with one another in addition to communicating with the scheduling entity.
  • a scheduling entity and one or more subordinate entities may communicate utilizing the scheduled resources.
  • a RAN may include a CU and DUs.
  • a NR BS e.g., gNB, 5G NB, NB, TRP, AP
  • NR cells can be configured as access cells (ACells) or data only cells (DCells) .
  • the RAN e.g., a central unit or distributed unit
  • DCells may be cells used for carrier aggregation or dual connectivity, but not used for initial access, cell selection/reselection, or handover. In some cases DCells may not transmit synchronization signals-in some case cases DCells may transmit SS.
  • NR BSs may transmit downlink signals to UEs indicating the cell type. Based on the cell type indication, the UE may communicate with the NR BS. For example, the UE may determine NR BSs to consider for cell selection, access, handover, and/or measurement based on the indicated cell type.
  • FIG. 2 illustrates an example logical architecture of a distributed radio access network (RAN) 200, which may be implemented in the wireless communication system illustrated in FIG. 1.
  • a 5G access node 206 may include an access node controller (ANC) 202.
  • the ANC may be a central unit (CU) of the distributed RAN 200.
  • the backhaul interface to the next generation core network (NG-CN) 204 may terminate at the ANC.
  • the backhaul interface to neighboring next generation access nodes (NG-ANs) may terminate at the ANC.
  • the ANC may include one or more TRPs 208 (which may also be referred to as BSs, NR BSs, Node Bs, 5G NBs, APs, or some other term) .
  • TRPs 208 which may also be referred to as BSs, NR BSs, Node Bs, 5G NBs, APs, or some other term.
  • TRP may be used interchangeably with “cell. ”
  • the TRPs 208 may be a DU.
  • the TRPs may be connected to one ANC (ANC 202) or more than one ANC (not illustrated) .
  • ANC ANC
  • RaaS radio as a service
  • a TRP may include one or more antenna ports.
  • the TRPs may be configured to individually (e.g., dynamic selection) or jointly (e.g., joint transmission) serve traffic to a UE.
  • the local architecture 200 may be used to illustrate fronthaul definition.
  • the architecture may be defined that support fronthauling solutions across different deployment types.
  • the architecture may be based on transmit network capabilities (e.g., bandwidth, latency, and/or jitter) .
  • the architecture may share features and/or components with LTE.
  • the next generation AN (NG-AN) 210 may support dual connectivity with NR.
  • the NG-AN may share a common fronthaul for LTE and NR.
  • the architecture may enable cooperation between and among TRPs 208. For example, cooperation may be preset within a TRP and/or across TRPs via the ANC 202. According to aspects, no inter-TRP interface may be needed/present.
  • a dynamic configuration of split logical functions may be present within the architecture 200.
  • the Radio Resource Control (RRC) layer, Packet Data Convergence Protocol (PDCP) layer, Radio Link Control (RLC) layer, Medium Access Control (MAC) layer, and a Physical (PHY) layers may be adaptably placed at the DU or CU (e.g., TRP or ANC, respectively) .
  • a BS may include a central unit (CU) (e.g., ANC 202) and/or one or more distributed units (e.g., one or more TRPs 208) .
  • CU central unit
  • distributed units e.g., one or more TRPs 208 .
  • FIG. 3 illustrates an example physical architecture of a distributed RAN 300, according to aspects of the present disclosure.
  • a centralized core network unit (C-CU) 302 may host core network functions.
  • the C-CU may be centrally deployed.
  • C-CU functionality may be offloaded (e.g., to advanced wireless services (AWS) ) , in an effort to handle peak capacity.
  • AWS advanced wireless services
  • a centralized RAN unit (C-RU) 304 may host one or more ANC functions.
  • the C-RU may host core network functions locally.
  • the C-RU may have distributed deployment.
  • the C-RU may be closer to the network edge.
  • a DU 306 may host one or more TRPs (edge node (EN) , an edge unit (EU) , a radio head (RH) , a smart radio head (SRH) , or the like) .
  • the DU may be located at edges of the network with radio frequency (RF) functionality.
  • RF radio frequency
  • FIG. 4 illustrates example components of the BS 110 and UE 120 illustrated in FIG. 1, which may be used to implement aspects of the present disclosure.
  • One or more components of the BS 110 and UE 120 may be used to practice aspects of the present disclosure.
  • antennas 452, Tx/Rx 222, processors 466, 458, 464, and/or controller/processor 480 of the UE 120 and/or antennas 434, processors 460, 420, 438, and/or controller/processor 440 of the BS 110 may be used to perform the operations described herein and illustrated with reference to FIGs. 8 and 9.
  • FIG. 4 shows a block diagram of a design of a BS 110 and a UE 120, which may be one of the BSs and one of the UEs in FIG. 1.
  • the base station 110 may be the macro BS 110c in FIG. 1, and the UE 120 may be the UE 120y.
  • the base station 110 may also be a base station of some other type.
  • the base station 110 may be equipped with antennas 434a through 434t, and the UE 120 may be equipped with antennas 452a through 452r.
  • a transmit processor 420 may receive data from a data source 412 and control information from a controller/processor 440.
  • the control information may be for the Physical Broadcast Channel (PBCH) , Physical Control Format Indicator Channel (PCFICH) , Physical Hybrid ARQ Indicator Channel (PHICH) , Physical Downlink Control Channel (PDCCH) , etc.
  • the data may be for the Physical Downlink Shared Channel (PDSCH) , etc.
  • the processor 420 may process (e.g., encode and symbol map) the data and control information to obtain data symbols and control symbols, respectively.
  • the processor 420 may also generate reference symbols, e.g., for the PSS, SSS, and cell-specific reference signal.
  • a transmit (TX) multiple-input multiple-output (MIMO) processor 430 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 the modulators (MODs) 432a through 432t.
  • Each modulator 432 may process a respective output symbol stream (e.g., for OFDM, etc. ) to obtain an output sample stream.
  • Each modulator 432 may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal.
  • Downlink signals from modulators 432a through 432t may be transmitted via the antennas 434a through 434t, respectively.
  • the antennas 452a through 452r may receive the downlink signals from the base station 110 and may provide received signals to the demodulators (DEMODs) 454a through 454r, respectively.
  • Each demodulator 454 may condition (e.g., filter, amplify, downconvert, and digitize) a respective received signal to obtain input samples.
  • Each demodulator 454 may further process the input samples (e.g., for OFDM, etc. ) to obtain received symbols.
  • a MIMO detector 456 may obtain received symbols from all the demodulators 454a through 454r, perform MIMO detection on the received symbols if applicable, and provide detected symbols.
  • a receive processor 458 may process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for the UE 120 to a data sink 460, and provide decoded control information to a controller/processor 480.
  • a transmit processor 464 may receive and process data (e.g., for the Physical Uplink Shared Channel (PUSCH) ) from a data source 462 and control information (e.g., for the Physical Uplink Control Channel (PUCCH) from the controller/processor 480.
  • the transmit processor 464 may also generate reference symbols for a reference signal.
  • the symbols from the transmit processor 464 may be precoded by a TX MIMO processor 466 if applicable, further processed by the demodulators 454a through 454r (e.g., for SC-FDM, etc. ) , and transmitted to the base station 110.
  • the uplink signals from the UE 120 may be received by the antennas 434, processed by the modulators 432, detected by a MIMO detector 436 if applicable, and further processed by a receive processor 438 to obtain decoded data and control information sent by the UE 120.
  • the receive processor 438 may provide the decoded data to a data sink 439 and the decoded control information to the controller/processor 440.
  • the controllers/processors 440 and 480 may direct the operation at the base station 110 and the UE 120, respectively.
  • the processor 440 and/or other processors and modules at the BS 110 may perform or direct, e.g., the execution of the functional blocks illustrated in FIG. 8 and/or other processes for the techniques described herein.
  • the processor 480 and/or other processors and modules at the UE 120 may also perform or direct, e.g., the execution of the functional blocks illustrated in FIG. 9 and/or other processes for the techniques described herein.
  • the memories 442 and 482 may store data and program codes for the BS 110 and the UE 120, respectively.
  • a scheduler 444 may schedule UEs for data transmission on the downlink and/or uplink.
  • FIG. 5 illustrates a diagram 500 showing examples for implementing a communications protocol stack, according to aspects of the present disclosure.
  • the illustrated communications protocol stacks may be implemented by devices operating in a in a 5G system (e.g., a system that supports uplink-based mobility) .
  • Diagram 500 illustrates a communications protocol stack including a Radio Resource Control (RRC) layer 510, a Packet Data Convergence Protocol (PDCP) layer 515, a Radio Link Control (RLC) layer 520, a Medium Access Control (MAC) layer 525, and a Physical (PHY) layer 530.
  • RRC Radio Resource Control
  • PDCP Packet Data Convergence Protocol
  • RLC Radio Link Control
  • MAC Medium Access Control
  • PHY Physical
  • the layers of a protocol stack may be implemented as separate modules of software, portions of a processor or ASIC, portions of non-collocated devices connected by a communications link, or various combinations thereof. Collocated and non-collocated implementations may be used, for example, in a protocol stack for a network access device (e.g., ANs, CUs, and/or DUs) or a UE.
  • a network access device e.g., ANs, CUs, and/or DUs
  • a first option 505-a shows a split implementation of a protocol stack, in which implementation of the protocol stack is split between a centralized network access device (e.g., an ANC 202 in FIG. 2) and distributed network access device (e.g., DU 208 in FIG. 2) .
  • a centralized network access device e.g., an ANC 202 in FIG. 2
  • distributed network access device e.g., DU 208 in FIG. 2
  • an RRC layer 510 and a PDCP layer 515 may be implemented by the central unit
  • an RLC layer 520, a MAC layer 525, and a PHY layer 530 may be implemented by the DU.
  • the CU and the DU may be collocated or non-collocated.
  • the first option 505-a may be useful in a macro cell, micro cell, or pico cell deployment.
  • a second option 505-b shows a unified implementation of a protocol stack, in which the protocol stack is implemented in a single network access device (e.g., access node (AN) , new radio base station (NR BS) , a new radio Node-B (NR NB) , a network node (NN) , or the like. ) .
  • the RRC layer 510, the PDCP layer 515, the RLC layer 520, the MAC layer 525, and the PHY layer 530 may each be implemented by the AN.
  • the second option 505-b may be useful in a femto cell deployment.
  • a UE may implement an entire protocol stack (e.g., the RRC layer 510, the PDCP layer 515, the RLC layer 520, the MAC layer 525, and the PHY layer 530) .
  • an entire protocol stack e.g., the RRC layer 510, the PDCP layer 515, the RLC layer 520, the MAC layer 525, and the PHY layer 530.
  • FIG. 6 is a diagram 600 showing an example of a DL-centric subframe.
  • the DL-centric subframe may include a control portion 602.
  • the control portion 602 may exist in the initial or beginning portion of the DL-centric subframe.
  • the control portion 602 may include various scheduling information and/or control information corresponding to various portions of the DL-centric subframe.
  • the control portion 602 may be a physical DL control channel (PDCCH) , as indicated in FIG. 6.
  • the DL-centric subframe may also include a DL data portion 604.
  • the DL data portion 604 may sometimes be referred to as the payload of the DL-centric subframe.
  • the DL data portion 604 may include the communication resources utilized to communicate DL data from the scheduling entity (e.g., UE or BS) to the subordinate entity (e.g., UE) .
  • the DL data portion 604 may be a physical DL shared channel (PDSCH) .
  • PDSCH physical DL shared channel
  • the DL-centric subframe may also include a common UL portion 606.
  • the common UL portion 606 may sometimes be referred to as an UL burst, a common UL burst, and/or various other suitable terms.
  • the common UL portion 606 may include feedback information corresponding to various other portions of the DL-centric subframe.
  • the common UL portion 606 may include feedback information corresponding to the control portion 602.
  • Non-limiting examples of feedback information may include an ACK signal, a NACK signal, a HARQ indicator, and/or various other suitable types of information.
  • the common UL portion 606 may include additional or alternative information, such as information pertaining to random access channel (RACH) procedures, scheduling requests (SRs) , and various other suitable types of information.
  • RACH random access channel
  • SRs scheduling requests
  • the end of the DL data portion 604 may be separated in time from the beginning of the common UL portion 606.
  • This time separation may sometimes be referred to as a gap, a guard period, a guard interval, and/or various other suitable terms.
  • This separation provides time for the switch-over from DL communication (e.g., reception operation by the subordinate entity (e.g., UE) ) to UL communication (e.g., transmission by the subordinate entity (e.g., UE) ) .
  • DL communication e.g., reception operation by the subordinate entity (e.g., UE)
  • UL communication e.g., transmission by the subordinate entity (e.g., UE)
  • FIG. 7 is a diagram 700 showing an example of an UL-centric subframe.
  • the UL -centric subframe may include a control portion 702.
  • the control portion 702 may exist in the initial or beginning portion of the UL-centric subframe.
  • the control portion 702 in FIG. 7 may be similar to the control portion 602 described above with reference to FIG. 6.
  • the UL-centric subframe may also include an UL data portion 704.
  • the UL data portion 704 may sometimes be referred to as the payload of the UL-centric subframe.
  • the UL portion may refer to the communication resources utilized to communicate UL data from the subordinate entity (e.g., UE) to the scheduling entity (e.g., UE or BS) .
  • the control portion 702 may be a physical DL control channel (PDCCH) .
  • PDCCH physical DL control channel
  • the end of the control portion 702 may be separated in time from the beginning of the UL data portion 704. This time separation may sometimes be referred to as a gap, guard period, guard interval, and/or various other suitable terms. This separation provides time for the switch-over from DL communication (e.g., reception operation by the scheduling entity) to UL communication (e.g., transmission by the scheduling entity) .
  • the UL-centric subframe may also include a common UL portion 706.
  • the common UL portion 706 in FIG. 7 may be similar to the common UL portion 606 described above with reference to FIG. 6.
  • the common UL portion 706 may additional or alternative include information pertaining to channel quality indicator (CQI) , sounding reference signals (SRSs) , and various other suitable types of information.
  • CQI channel quality indicator
  • SRSs sounding reference signals
  • a frame may include both UL centric subframes and DL centric subframes.
  • the ratio of UL centric subframes to DL subframes in a frame may be dynamically adjusted based on the amount of UL data and the amount of DL data that are transmitted.
  • the ratio of UL centric subframes to DL subframes may be increased. Conversely, if there is more DL data, then the ratio of UL centric subframes to DL subframes may be decreased.
  • two or more subordinate entities may communicate with each other using sidelink signals.
  • Real-world applications of such sidelink communications may include public safety, proximity services, UE-to-network relaying, vehicle-to-vehicle (V2V) communications, Internet-of-Everything (IoE) communications, IoT communications, mission-critical mesh, and/or various other suitable applications.
  • a sidelink signal may refer to a signal communicated from one subordinate entity (e.g., UE1) to another subordinate entity (e.g., UE2) without relaying that communication through the scheduling entity (e.g., UE or BS) , even though the scheduling entity may be utilized for scheduling and/or control purposes.
  • the sidelink signals may be communicated using a licensed spectrum (unlike wireless local area networks, which typically use an unlicensed spectrum) .
  • a UE may operate in various radio resource configurations, including a configuration associated with transmitting pilots using a dedicated set of resources (e.g., a radio resource control (RRC) dedicated state, etc. ) or a configuration associated with transmitting pilots using a common set of resources (e.g., an RRC common state, etc. ) .
  • RRC radio resource control
  • the UE may select a dedicated set of resources for transmitting a pilot signal to a network.
  • the UE may select a common set of resources for transmitting a pilot signal to the network.
  • a pilot signal transmitted by the UE may be received by one or more network access devices, such as an AN, or a DU, or portions thereof.
  • Each receiving network access device may be configured to receive and measure pilot signals transmitted on the common set of resources, and also receive and measure pilot signals transmitted on dedicated sets of resources allocated to the UEs for which the network access device is a member of a monitoring set of network access devices for the UE.
  • One or more of the receiving network access devices, or a CU to which receiving network access device (s) transmit the measurements of the pilot signals may use the measurements to identify serving cells for the UEs, or to initiate a change of serving cell for one or more of the UEs.
  • channel state information may refers to known channel properties of a communication link.
  • the CSI may represent the combined effects of, for example, scattering, fading, and power decay with distance between a transmitter and receiver.
  • Channel estimation may be performed to determine these effects on the channel.
  • CSI may be used to adapt transmissions based on the current channel conditions, which is useful for achieving reliable communication, in particular, with high data rates in multi-antenna systems.
  • CSI is typically estimated at the receiver, quantized, and fed back to the transmitter.
  • CSI feedback is based on a pre-defined codebook. This may be referred to as implicit CSI feedback.
  • Precoding may be used for beamforming in multi-antenna systems.
  • Codebook based precoding uses a common codebook at the transmitter and receiver.
  • the codebook includes a set of vectors and matrices.
  • the UE calculates a precoder targeting maximum single-user (SU) multiple input multiple output (MIMO) spectrum efficiency.
  • the implicit CSI feedback include a rank indicator (RI) , a transmitted precoding matrix indicator (TPMI) , and associated channel quality indicator (CQI) based on the TPMI.
  • the PMI includes a WI precoding matrix and a W2 precoding matrix.
  • UL MIMO is generally achieved with precoder feedback, and thus is based on an uplink (UL) codebook based design.
  • certain systems e.g., NR-MIMO
  • Supporting a non-codebook based UL transmission scheme may refer to supporting an uplink transmission (e.g., from the UE) without including precoding information, such as a transmitted precoding matrix indicator (TPMI) , in the UL grant.
  • TPMI transmitted precoding matrix indicator
  • the UE may be configured with multiple SRS resources (e.g., for sending SRS) , and each SRS resource may include one or more SRS ports.
  • the UE may determine a candidate set of uplink transmit beams (e.g., precoders) based on measurement of downlink reference signals from the BS and channel reciprocity.
  • the UE may use the determined uplink precoder to precode the SRS ports in each SRS resource and transmit the SRS resources to the BS.
  • the BS can measure the multiple precoded SRS ports, and choose a precoder for the UE to use for PUSCH.
  • the BS can then feedback indicators along with downlink control information (DCI) (e.g., without TPMI) to indicate the rank and selected precoder for PUSCH.
  • DCI downlink control information
  • Non-codebook based UL transmission may provide more accurate UL beamforming, but this transmission mode also relies on DL-UL reciprocity.
  • Non-codebook based UL transmission is also sensitive to UE mobility. When UL channel quality degrades and varies frequently, a UE under a non-codebook based UL transmission scheme may produce transmission failures. Dynamically switching between non-codebook and codebook based UL transmission may enable the RAN to detect a degraded UL channel and instruct the UE to switch its UL transmission configuration, e.g., from non-codebook based UL transmission to codebook based UL transmission, to improve the signal to noise ratio observed at the RAN.
  • Dynamic switching between UL transmission configurations may support various types of signaling in order to indicate to the UE whether to switch UL transmission modes.
  • the indication of whether to switch UL transmission configurations may be signaled via one or more downlink control signals, such as downlink control information (DCI) signals.
  • DCI downlink control information
  • the indication of whether to switch may be transmitted via a single DCI message or multiple DCI messages.
  • the indication of whether to switch may be done via single stage, for example, a dedicated DCI format without an UL grant.
  • the DCI format may also include a dedicated field indicating whether to switch transmission modes.
  • the DCI field indicating whether to switch may be a single bit flag, e.g., a value of “1” may indicate to the UE to switch from one UL transmission mode to the other.
  • the indication of whether to switch may be transmitted in two stages.
  • the first stage may be a DCI message without UL grant, for example, including the dedicated field indicating whether to switch transmission modes.
  • the second stage may be a DCI message with UL grant, for example, the DCI message may contain the preferred sounding resource indicator (SRI) and/or precoding information.
  • SRI sounding resource indicator
  • the signaling options that are supported may be based in part on the UE’s capability as exchanged between the UE and RAN via radio resource control signaling.
  • aspects presented herein provide techniques for performing dynamic switching between non-codebook and codebook based UL transmission schemes.
  • FIG. 8 is a flow diagram illustrating example operations 800 that may be performed, for example, by a base station and/or radio access network (e.g., BS 110 of FIG. 1) , for implementing dynamic switching between non-codebook and codebook based UL transmissions, in accordance with certain aspects of the present disclosure.
  • Operations 800 may be implemented as software components that are executed and run on one or more processors (e.g., processor 440 of FIG. 4) .
  • the transmission and reception of signals by the BS in operations 800 may be enabled, for example, by one or more antennas (e.g., antennas 434 of FIG. 4) .
  • Operations 800 may begin, at 802, by the BS transmitting a signal to a user equipment (e.g., UE 120 of FIG. 1) indicating to the UE to transmit uplink (UL) signals using a first UL transmission configuration.
  • the BS may transmit a control signal configuring the UE with at least two SRS resource configurations, where one resource configuration is used for non-codebook based UL transmissions and the other resource configuration is used for codebook based UL transmissions.
  • the codebook based resource configuration may have a codebook subset configured as fully coherent, partially coherent, and/or non-coherent depending on the UE’s capabilities.
  • the non-codebook based resource configuration may have information about the DL reference signal (e.g., a CSI-RS) used to derive the UL precoder.
  • a CSI-RS CSI-RS
  • These non-codebook based and codebook based resource configurations enable the BS to dynamically switch the UL transmission configuration employed by the UE as further described herein.
  • the first UL transmission configuration may be either a codebook based or non-codebook based UL transmission configuration.
  • the BS may configure the UE with a single SRS resource configuration.
  • the SRS resource configuration may also include a codebook subset to be used when codebook based UL transmission is configured, and an indication of an associated downlink reference signal to be used for precoder derivation when non-codebook based UL transmission is configured. That is, the BS may dynamically configure the UE to transmit UL signal using codebook based transmission or non-codebook based transmission. When codebook based transmission is used, the BS may select precoder from the codebook subset configured in the SRS resource configuration and indicate the selected precoder to the UE.
  • the UE may derive precoders using the associated DL reference signal and use the derived precoder to transmit SRS signals.
  • the codebook subset may be fully coherent, partially coherent, non-coherent depending on the UE’s capabilities, and/or a dedicated codebook subset used for switching from non-codebook based transmission to the codebook based transmission.
  • the BS receives an UL signal from the UE according to the first UL transmission configuration. For example, as the UE transmits UL data to the BS, the UE may also transmit an SRS according to the first UL transmission configuration. The BS receives the data/SRS which enables the BS to estimate the quality of uplink channels assigned to the UE.
  • the BS determines whether to switch from the first UL transmission configuration to a second UL transmission configuration based on the received UL signal.
  • the BS may determine that the channel quality of the UE’s UL transmissions is degrading and determine to switch to a different UL transmission configuration.
  • the BS may determine that the channel quality of the UL transmissions is acceptable, and that the UE may continue to transmit using the first UL transmission configuration.
  • the BS may determine based on the received SRS to switch to a codebook based UL transmission configuration by determining that the channel conditions for non-codebook based UL transmissions is degrading.
  • the channel conditions observed by the BS based on the SRS may be below a channel quality threshold.
  • the BS may determine to switch to transmission modes based on a threshold for UE transmission failures observed by the BS, such as a block error ratio (BLER) or bit error rate (BER) .
  • BLER block error ratio
  • BER bit error rate
  • the BS transmits an indication of whether to switch from the first UL transmission configuration to the second UL transmission configuration to the UE.
  • the indication may be transmitted to the UE via one or more downlink control signaling messages, such as downlink control information (DCI) .
  • DCI downlink control information
  • the BS may transmit to the UE an indication not to switch the UL transmission configuration.
  • the switching transmission configurations may apply to the most recent data transmission. That is, from the indication of the switching to the end of the most recent data transmission, the UE may use the second UL configuration and switch back to the first UL configuration afterwards.
  • the indication of whether to switch transmission modes may also include a duration of time for the UE to employ the second UL transmission configuration.
  • the duration may indicate to the UE a timing to switch from the second UL transmission configuration back to the first UL transmission configuration. That is, the UE may be programmed in advance to switch to the first UL transmission configuration at the end of the duration. In certain aspects, the duration may indicate to the UE that the duration of the second UL transmission configuration is indefinite (i.e., the UE is to use the second UL transmission configuration until the BS transmits an indication to switch the UL transmission scheme or reconfigure the UL transmission for the UE) .
  • FIG. 9 is a flow diagram illustrating example operations 900 that may be performed, for example, by a UE (e.g., UE 120) , for implementing dynamic switching between non-codebook and codebook based UL transmissions, in accordance with certain aspects of the present disclosure.
  • Operations 900 may be implemented as software components that are executed and run on one or more processors (e.g., processor 480 of FIG. 4) .
  • the transmission and reception of signals by the UE in operations 900 may be enabled, for example, by one or more antennas (e.g., antennas 452 of FIG. 4) .
  • Operations 900 may begin, at 902, by the UE receiving a signal, from a base station (BS) , indicating an UL transmission is to be based on a first UL transmission configuration. For instance, the UE may receive a control signal to utilize a specific UL transmission configuration, such as a non-codebook based UL transmission configuration. As described previously with respect to operations 800 of FIG. 8, the UE may receive a configuration for at least two SRS resources configurations, where one SRS resource configuration is used for non-codebook UL transmissions and the other SRS resource configuration is used for codebook based UL transmissions. In certain aspects, as previously discussed with respect to operations 800, the UE may receive a configuration of a single SRS resource configuration. The SRS resource configuration may also include a codebook subset to be used when codebook based UL transmission is configured, and an indication of an associated downlink reference signal to be used for precoder derivation when non-codebook based UL transmission is configured.
  • BS base station
  • the UE transmits an UL signal to the BS using the first UL transmission configuration. For instance, the UE may transmit the SRS according to a non-codebook based UL transmission configuration as indicated by the first UL transmission configuration.
  • the UE receives, from the BS, an UL transmission configuration switching indication.
  • the indication of whether to switch UL transmission configuration may be received in a single stage via a DCI message or over two stages via two DCI messages as further described herein.
  • the UE determines whether to switch from the first UL transmission configuration to a second UL transmission configuration based on the received indication.
  • the indication may instruct the UE to switch its UL transmission configuration.
  • the indication may instruct the UE to continue transmitting according to its UL transmission configuration as set at 902.
  • the UE transmits UL signals to the BS based on the determination. For instance, the UE may switch from the first UL transmission configuration to a second UL transmission configuration. The UE may perform this switch by disabling the precoder used in the previous UL transmission and transmitting data via the granted PUSCH according to the second UL transmission configuration. The UE may also transmit the SRS according to the second UL transmission configuration. Alternatively, the UE may not switch to a different UL transmission mode and continue to transmit according to the first UL transmission configuration. The UE may receive preferred SRS resources in one or more SRI (s) via the BS.
  • SRI SRI
  • the UE may transmit its capabilities, to the RAN, indicating that the UE can switch between non-codebook based and codebook based UL transmission configurations.
  • the capabilities of the UE to support dynamic switching between non-codebook and codebook may be included in a single bit Boolean flag and transmitted via radio resource control signaling.
  • the RAN may receive the capabilities of the UE and perform dynamic switching between non-codebook based and codebook-based UL transmission configurations based on the received capabilities of the UE.
  • the BS may configure the UE to switch between non-codebook and codebook based UL transmission configurations. That is, the BS may dynamically switch the UE either from non-codebook based to codebook based or from codebook based to non-codebook based UL transmission modes. This enables the BS to indefinitely switch between the non-codebook/codebook transmission schemes.
  • the BS may configure the UE with two SRS resource configurations, where one SRS resource configuration is used for non-codebook based UL transmissions and the other SRS resource configuration is used for codebook based UL transmissions.
  • the BS may signal the indication of whether to switch the UL transmission configuration by transmitting a specific DCI format without an uplink grant.
  • the DCI format may include a field dedicated to indicating whether to switch UL transmission modes.
  • the dedicated field may be a single bit flag, where, for example, the value “1” of the dedicated field indicates to the UE to switch from one mode to the other mode, and the value “0” indicates to the UE not to switch to the other UL transmission mode.
  • the switching transmission configurations may apply to the most recent data transmission. That is, from the indication of the switching to the end of the most recent data transmission, the UE may use the second UL configuration and switch back to the first UL configuration afterwards.
  • the DCI message may also include a duration of time for the UE to employ the other UL transmission configuration. The duration may indicate to the UE a timing to switch from the second UL transmission configuration to the first UL transmission configuration. In certain aspects, the duration may indicate an indefinite amount of time for the UE to use the second UL transmission configuration.
  • the BS may configure the UE, via downlink control signaling (e.g., DCI) , to switch from a non-codebook based UL transmission configuration to a codebook based UL transmission configuration.
  • DCI downlink control signaling
  • the BS may configure the UE at least two SRS resource configurations, where one resource configuration is used for non-codebook based UL transmissions and the other resource configuration is used for codebook based UL transmissions.
  • the BS may configure the UE to use a single SRS resource configuration.
  • the SRS resource may also include a codebook subset to be used when codebook based UL transmission is configured, and an indication of an associated downlink reference signal to be used for precoder derivation when non-codebook based UL transmission is configured.
  • the BS may determine based on the received data and/or SRS not to switch to a codebook based UL transmission configuration. In this case, the BS may select a preferred SRS resources (or SRS ports if each resource has only one port when non-codebook based UL transmission is used) and transmit this set of resources to the UE via one or more sounding resource indicator (s) (SRI (s) ) , which indicate (s) to the UE which SRS resources to use for non-codebook UL transmissions.
  • SRI sounding resource indicator
  • the BS may indicate whether to switch UL transmission schemes with either single stage or two-stage downlink control signaling. That is, the BS may use one or more downlink control signals to perform the transmission mode switch. For single stage signaling, the BS may transmit a single downlink control signal (e.g., a DCI message) to indicate whether to switch UL transmission modes.
  • a single downlink control signal e.g., a DCI message
  • the indication of whether to switch transmission modes may be provided, for example, by a specific value of SRI, a specific value of transmission precoder and rank indicator, or a combination thereof.
  • the BS may transmit an additional entry of the SRI apart from all possible SRS resource selections to indicate to switch from the non-codebook based UL transmission configuration to a codebook based UL transmission configuration. That is, the BS may include an additional entry to the SRI candidate set to indicate whether to switch transmission modes.
  • the total number of possible SRS resource selections is given by this expression:
  • N is the total number of resources/ports
  • L is the maximum number of layers (e.g., the maximum number of SRS resources that can be selected) .
  • a single entry e.g., a single bit
  • SRI the total possible cases for SRI by the following expression:
  • the number of bits used for the SRI to indicate the selected resources and/or whether to switch UL transmission modes may be given by the following expression:
  • the control signaling indicates to the UE not to switch UL transmission modes. If the UL grant includes the SRI associated with the specific entry, the control signaling indicates to the UE to switch UL transmission modes and the control signaling may also include the transmission precoder and rank information.
  • the transmission precoder and rank information are calculated by aggregating all the ports in all the SRS resources, and are selected from the configured codebook subset.
  • the BS may transmit an UL grant to the UE, where the UL grant includes at least one of an SRI and precoding information including a transmission precoder and a transmission rank indicator. If the UL grant includes the SRI without precoding information, that control signaling indicates to the UE not to switch UL transmission modes (i.e., the UE continues to transmit data using a non-codebook based UL transmission scheme) . Whereas, if the UL grant includes the SRI with precoding information, that control signaling indicates to the UE to switch to a codebook based UL transmission configuration.
  • the transmission precoder and rank information are calculated by aggregating all the ports in all the SRS resources, and are selected from the configured codebook subset.
  • single-stage signaling may be implemented by transmitting a specific entry of the transmission precoder and rank indicator apart from all the possible selections and transmitting an SRI to the UE.
  • the payload for precoding information may be based on a table of bit sequences (e.g., a transmitted precoding matrix indicator (TPMI) ) corresponding to the transmission precoder and rank indicator.
  • TPMI transmitted precoding matrix indicator
  • a reserved field i.e., a reserved bit sequence of the TPMI
  • an additional entry added to the TPMI table, along with an SRI in the downlink control signaling, to indicate not to switch to a codebook based UL transmission configuration.
  • the control signaling indicates UE not switch to the codebook based UL transmission.
  • the control signaling indicates UE to switch to the codebook based UL transmission, and the precoder and rank are calculated by aggregating all the ports in all the SRS resources.
  • the switching can apply to the most recent UL data transmission.
  • the duration for the switching is also included by adding more entries to the SRI, TPMI, or combination thereof.
  • the BS may first transmit a DCI message for transmission mode switching without an UL grant.
  • the first DCI message may include a dedicated field to indicate whether to switch to a second UL transmission configuration.
  • the first DCI message may also include an indication of whether to switch as previously discussed with respect to single-stage switching.
  • the DCI message may include a duration for the UE to employ the codebook based UL transmission configuration. At the end of the duration, the UE may switch back to the non-codebook based UL transmission configuration.
  • the BS may transmit a DCI message with an UL grant based on whether to switch the transmission mode indicated in the first stage DCI.
  • the UL grant may include at least one of an SRI and precoding information including a transmission precoder and rank indicator. For example, if the BS determines not to switch to a codebook based UL transmission, the DCI message includes the preferred SRI for non-codebook based UL transmissions without precoding information. Whereas, if the BS determines to switch to a codebook based UL transmission, the DCI message includes precoding information, including a specific SRI, and a transmission precoder and rank indicator (e.g., TPMI) , to the UE.
  • TPMI transmission precoder and rank indicator
  • the BS may calculate the transmission precoder and rank indicator by aggregating the antenna ports transmitted in the one or more SRS resources.
  • the BS may transmit the calculated transmission precoder and rank indicator to the UE to indicate to switch from the non-codebook based UL transmission configuration to a codebook based UL transmission configuration.
  • the RAN may also reserve switching transmission modes until data transmissions are completed by the UE. For instance, after switching transmission modes, the BS may receive UL signals according to the second UL transmission configuration. The BS may wait until the UE ceases to transmit data and then transmit an indication to switch back to the first UL transmission configuration after the UL data transmission has finished.
  • the RAN may also indicate falling back to transmission mode based on a duration included in downlink control signaling as described herein with respect to operations 800. This enables the RAN to reduce the amount of control signaling used to perform a transmission mode switch or test whether a switch provides any signal quality improvements. For instance, the BS may transmit a DCI message indicating to the UE to switch transmission modes with a duration for the UE to use the new transmission mode. The UE may then fall back to its original transmission mode at the end of the specified duration.
  • the RAN may also provide semi-persistent switching between UL transmission modes. For instance, after switching transmission modes, the BS may receive UL signals from the UE according to the second UL transmission configuration. The BS may determine whether to change the second UL transmission configuration or switch back to the first UL transmission configuration based on the received UL signals. The BS may transmit an indication to change the second UL transmission configuration to the UE.
  • the indication to change the second UL transmission configuration may include at least one of a radio resource control (RRC) signal, a medium access control layer control element (MACCE) , a specific DCI, a specific SRI, or a specific TPMI.
  • RRC radio resource control
  • MACCE medium access control layer control element
  • FIG. 10 illustrates a wireless communications device 1000 that may include various components (e.g., corresponding to means-plus-function components) configured to perform operations for the techniques disclosed herein, such as the operations illustrated in one or more of FIGs. 8 and 9.
  • the communications device 1000 includes a processing system 1000 coupled to a transceiver 1010.
  • the transceiver 1010 is configured to transmit and receive signals for the communications device 1000 via an antenna 1012, such as the various signals described herein.
  • the processing system 1002 may be configured to perform processing functions for the communications device 1000, including processing signals received and/or to be transmitted by the communications device 1000.
  • the processing system 1002 includes one or more processors 1004 coupled to a computer-readable medium/memory 1006 via a bus 1008.
  • the computer-readable medium/memory 1006 is configured to store computer-executable instructions that when executed by processor 1004, cause the processor 0204 to perform the operations illustrated in one or more of FIGs. 8 and 9, or other operations for performing the various techniques discussed herein.
  • the processing system 1002 further includes a receive component 1014 for performing the receiving operations illustrated in one or more of FIGs. 8 and 9. Additionally, the processing system 1002 includes a transmit component 1016 for performing the transmitting operations illustrated in one or more of FIGs. 8 and 9. Further, the processing system 1002 includes a performing component 1018 for performing the performing operations illustrated in one or more of FIGs. 8 and 9. Also, the processing system 1002 includes a determining component 1020 for performing the determining operations illustrated in one or more of FIGs. 8 and 9. The receive component 1014, transmit component 1016, performing component 1018, and determining component 1020 may be coupled to the processor 1004 via bus 1008.
  • the receive component 1014, transmit component 1016, performing component 1018, and determining component 1020 may be hardware circuits. In certain aspects, the receive component 1014, transmit component 1016, performing component 1018, and determining component 1020 may be software components that are executed and run on processor 1204.
  • Dynamically switching between non-codebook and codebook based UL transmission configurations enables the RAN to respond to degrading UL channel conditions for a particular transmission scheme.
  • the UE may be configured for non-codebook based UL transmissions under channel conditions that are not suited for this transmission scheme.
  • the RAN may detect the degraded UL channel conditions for the non-codebook based and instruct the UE to switch to a codebook based UL transmission configuration.
  • Dynamic switching may also enable the RAN to test UL transmission modes and determine the transmission UL mode that provides the highest signal to noise ratio, thereby reducing transmission failures.
  • a phrase referring to “at least one of” a list of items refers to any combination of those items, including single members.
  • “at least one of: a, b, or c” is intended to cover a, b, c, a-b, a-c, b-c, and a-b-c, as well as any combination with multiples of the same element (e.g., a-a, a-a-a, a-a-b, a-a-c, a-b-b, a-c-c, b-b, b-b-b, b-b-c, c-c, and c-c-c or any other ordering of a, b, and c) .
  • determining encompasses a wide variety of actions. For example, “determining” may include calculating, computing, processing, deriving, investigating, looking up (e.g., looking up in a table, a database or another data structure) , ascertaining and the like. Also, “determining” may include receiving (e.g., receiving information) , accessing (e.g., accessing data in a memory) and the like. Also, “determining” may include resolving, selecting, choosing, establishing and the like.
  • the various operations of methods described above may be performed by any suitable means capable of performing the corresponding functions.
  • the means may include various hardware and/or software component (s) and/or module (s) , including, but not limited to a circuit, an application specific integrated circuit (ASIC) , or processor.
  • ASIC application specific integrated circuit
  • means for transmitting, means for outputting, means for receiving, means for selecting, means for identifying, means for determining, means for performing, means for obtaining, and/or means for generating may comprise one or more processors or antennas at the BS 110 or UE 120, such as the transmit processor 420, controller/processor 440, receive processor 438, or antennas 434 at the BS 110 and/or the transmit processor 464, controller/processor 480, receive processor 458, or antennas 452 at the UE 120 of FIG. 4.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • PLD programmable logic device
  • a general-purpose processor may be a microprocessor, but in the alternative, the processor may be any commercially available 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, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
  • an example hardware configuration may comprise a processing system in a wireless node.
  • the processing system may be implemented with a bus architecture.
  • the bus may include any number of interconnecting buses and bridges depending on the specific application of the processing system and the overall design constraints.
  • the bus may link together various circuits including a processor, machine-readable media, and a bus interface.
  • the bus interface may be used to connect a network adapter, among other things, to the processing system via the bus.
  • the network adapter may be used to implement the signal processing functions of the PHY layer.
  • a user interface e.g., keypad, display, mouse, joystick, etc.
  • a user interface e.g., keypad, display, mouse, joystick, etc.
  • the bus may also link various other circuits such as timing sources, peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further.
  • the processor may be implemented with one or more general-purpose and/or special-purpose processors. Examples include microprocessors, microcontrollers, DSP processors, and other circuitry that can execute software. Those skilled in the art will recognize how best to implement the described functionality for the processing system depending on the particular application and the overall design constraints imposed on the overall system.
  • the functions may be stored or transmitted over as one or more instructions or code on a computer-readable medium.
  • Software shall be construed broadly to mean instructions, data, or any combination thereof, whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
  • Computer-readable media include both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another.
  • the processor may be responsible for managing the bus and general processing, including the execution of software modules stored on the machine-readable storage media.
  • a computer-readable storage medium may be coupled to a processor such that the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor.
  • the machine-readable media may include a transmission line, a carrier wave modulated by data, and/or a computer readable storage medium with instructions stored thereon separate from the wireless node, all of which may be accessed by the processor through the bus interface.
  • the machine-readable media, or any portion thereof may be integrated into the processor, such as the case may be with cache and/or general register files.
  • machine-readable storage media may include, by way of example, RAM (Random Access Memory) , flash memory, ROM (Read Only Memory) , PROM (Programmable Read-Only Memory) , EPROM (Erasable Programmable Read-Only Memory) , EEPROM (Electrically Erasable Programmable Read-Only Memory) , registers, magnetic disks, optical disks, hard drives, or any other suitable storage medium, or any combination thereof.
  • RAM Random Access Memory
  • ROM Read Only Memory
  • PROM Programmable Read-Only Memory
  • EPROM Erasable Programmable Read-Only Memory
  • EEPROM Electrical Erasable Programmable Read-Only Memory
  • registers magnetic disks, optical disks, hard drives, or any other suitable storage medium, or any combination thereof.
  • the machine-readable media may be embodied in a computer-program product.
  • a software module may comprise a single instruction, or many instructions, and may be distributed over several different code segments, among different programs, and across multiple storage media.
  • the computer-readable media may comprise a number of software modules.
  • the software modules include instructions that, when executed by an apparatus such as a processor, cause the processing system to perform various functions.
  • the software modules may include a transmission module and a receiving module. Each software module may reside in a single storage device or be distributed across multiple storage devices.
  • a software module may be loaded into RAM from a hard drive when a triggering event occurs.
  • the processor may load some of the instructions into cache to increase access speed.
  • One or more cache lines may then be loaded into a general register file for execution by the processor.
  • any connection is 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, digital subscriber line (DSL) , or wireless technologies such as infrared (IR) , radio, and microwave
  • the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium.
  • Disk and disc include compact disc (CD) , laser disc, optical disc, digital versatile disc (DVD) , floppy disk, and disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers.
  • computer-readable media may comprise non-transitory computer-readable media (e.g., tangible media) .
  • computer-readable media may comprise transitory computer-readable media (e.g., a signal) . Combinations of the above should also be included within the scope of computer-readable media.
  • certain aspects may comprise a computer program product for performing the operations presented herein.
  • a computer program product may comprise a computer-readable medium having instructions stored (and/or encoded) thereon, the instructions being executable by one or more processors to perform the operations described herein.
  • modules and/or other appropriate means for performing the methods and techniques described herein can be downloaded and/or otherwise obtained by a user terminal and/or base station as applicable.
  • a user terminal and/or base station can be coupled to a server to facilitate the transfer of means for performing the methods described herein.
  • various methods described herein can be provided via storage means (e.g., RAM, ROM, a physical storage medium such as a compact disc (CD) or floppy disk, etc. ) , such that a user terminal and/or base station can obtain the various methods upon coupling or providing the storage means to the device.
  • storage means e.g., RAM, ROM, a physical storage medium such as a compact disc (CD) or floppy disk, etc.
  • CD compact disc
  • floppy disk etc.
  • any other suitable technique for providing the methods and techniques described herein to a device can be utilized.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Certains aspects de la présente invention concernent des techniques et un appareil de commutation dynamique entre des systèmes de transmission de liaison montante non basées sur un livre de codes et basées sur un livre de codes. Un procédé consiste globalement à transmettre un signal à un équipement utilisateur (UE) indiquant à L'UE de transmettre des signaux de liaison montante (UL) à l'aide d'une première configuration de transmission d'UL et à recevoir un signal d'UL de l'UE conformément à la première configuration de transmission d'UL. Le procédé consiste également à déterminer s'il convient, ou non, de commuter de la première configuration de transmission d'UL à une seconde configuration de transmission d'UL sur la base du signal d'UL reçu et à transmettre une indication de commutation éventuelle de la première configuration de transmission d'UL à la seconde configuration de transmission d'UL à l'UE.
PCT/CN2018/075933 2018-02-09 2018-02-09 Commutation dynamique entre des transmissions de liaison montante non basées sur un livre de codes et basées sur un livre de codes WO2019153224A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2018/075933 WO2019153224A1 (fr) 2018-02-09 2018-02-09 Commutation dynamique entre des transmissions de liaison montante non basées sur un livre de codes et basées sur un livre de codes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2018/075933 WO2019153224A1 (fr) 2018-02-09 2018-02-09 Commutation dynamique entre des transmissions de liaison montante non basées sur un livre de codes et basées sur un livre de codes

Publications (1)

Publication Number Publication Date
WO2019153224A1 true WO2019153224A1 (fr) 2019-08-15

Family

ID=67548069

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2018/075933 WO2019153224A1 (fr) 2018-02-09 2018-02-09 Commutation dynamique entre des transmissions de liaison montante non basées sur un livre de codes et basées sur un livre de codes

Country Status (1)

Country Link
WO (1) WO2019153224A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113115466A (zh) * 2021-03-26 2021-07-13 联想(北京)有限公司 下行传输方式的控制方法及装置
WO2022028501A1 (fr) * 2020-08-07 2022-02-10 大唐移动通信设备有限公司 Procédé et appareil de transmission de signal, et support de stockage
US11251842B2 (en) * 2017-09-11 2022-02-15 Qualcomm Incorporated Method for configuring non-codebook based UL MIMO transmission
WO2022052025A1 (fr) * 2020-09-11 2022-03-17 Lenovo (Beijing) Limited Transmission pusch dans des trp multiples basés sur des dci multiples
WO2022154832A1 (fr) * 2021-01-15 2022-07-21 Qualcomm Incorporated Entrée multiple sortie multiple (mimo) de liaison montante cohérente (ul)
WO2024030774A1 (fr) * 2022-08-03 2024-02-08 Qualcomm Incorporated Commutation vers une procédure de formation de faisceaux hybride basée sur un poids de faisceau adaptatif
WO2024094048A1 (fr) * 2022-11-03 2024-05-10 中国移动通信有限公司研究院 Procédé et appareil de communication, et dispositif et support de stockage

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101291163A (zh) * 2007-04-17 2008-10-22 大唐移动通信设备有限公司 时分双工系统中进行预编码的方法、系统及装置

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101291163A (zh) * 2007-04-17 2008-10-22 大唐移动通信设备有限公司 时分双工系统中进行预编码的方法、系统及装置

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
NOKIA ET AL.: "Summary of issues on UL non-codebook based transmission", 3GPP TSG RAN WGI #90BIS MEETING R1-1718871, 13 October 2017 (2017-10-13), XP051353334 *
SPREADTRUM COMMUNICATIONS: "Consideration on UL diversity transmission", 3GPP TSG RAN WGI MEETING NR#3 R1-1715516, 21 September 2017 (2017-09-21), XP051329059 *
VIVO: "Discussion on Non-codebook Based UL Transmission", 3GPP TSG RAN WGI MEETING #90BIS R1-1717468, 13 October 2017 (2017-10-13), XP051340656 *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11251842B2 (en) * 2017-09-11 2022-02-15 Qualcomm Incorporated Method for configuring non-codebook based UL MIMO transmission
WO2022028501A1 (fr) * 2020-08-07 2022-02-10 大唐移动通信设备有限公司 Procédé et appareil de transmission de signal, et support de stockage
CN114070528A (zh) * 2020-08-07 2022-02-18 大唐移动通信设备有限公司 一种信号传输方法、装置及存储介质
WO2022052025A1 (fr) * 2020-09-11 2022-03-17 Lenovo (Beijing) Limited Transmission pusch dans des trp multiples basés sur des dci multiples
WO2022154832A1 (fr) * 2021-01-15 2022-07-21 Qualcomm Incorporated Entrée multiple sortie multiple (mimo) de liaison montante cohérente (ul)
CN113115466A (zh) * 2021-03-26 2021-07-13 联想(北京)有限公司 下行传输方式的控制方法及装置
WO2024030774A1 (fr) * 2022-08-03 2024-02-08 Qualcomm Incorporated Commutation vers une procédure de formation de faisceaux hybride basée sur un poids de faisceau adaptatif
WO2024094048A1 (fr) * 2022-11-03 2024-05-10 中国移动通信有限公司研究院 Procédé et appareil de communication, et dispositif et support de stockage

Similar Documents

Publication Publication Date Title
EP3666010B1 (fr) Signalisation de rang de transmission et de précodeur dans une transmission basée sur un livre de codes de liaison montante
EP3593478B1 (fr) Sélection d'un faisceau de transmission de liaison montante nr sur la base de faisceaux de réception pdcch/pdsch
AU2019220741B2 (en) Modulation and coding scheme and channel quality indicator for high reliability
WO2018201447A1 (fr) Procédures de compte rendu de csi différentiel
WO2018082682A1 (fr) Procédés et appareil de réglage de paramètres relatifs à des csi de sous-bande
WO2020063729A1 (fr) Analyse de signal de référence d'informations d'état de canal (csi-rs) de liaison descendante guidée par un signal de référence de sondage (srs)
WO2019100257A1 (fr) Configuration d'une notification d'informations d'état de canal (csi) basée sur des ressources de gestion d'interférence à puissance non nulle (nzp-imr)
WO2019153224A1 (fr) Commutation dynamique entre des transmissions de liaison montante non basées sur un livre de codes et basées sur un livre de codes
WO2018170821A1 (fr) Compte rendu de csi différentiel pour csi à résolution plus élevée
WO2020030078A1 (fr) Retour d'informations d'état de canal pour transmissions conjointes non cohérentes
WO2018058600A1 (fr) Conception de rétroaction d'informations d'état de canal avancée
WO2018148895A1 (fr) Détermination de retard moyen de dmrs et d'étalement de retard durant un précodage régulier
EP3665784B1 (fr) Précodage de signaux de référence pour transmission de liaison montante avec des informations d'interférence de liaison descendante
US11381289B2 (en) Codebook subset restriction design for MIMO
WO2019051634A1 (fr) Procédés et appareil utilisés pour indiquer un sous-ensemble de ports de csi-rs
WO2018082640A1 (fr) Configuration et signalisation de groupe de blocs de ressources physiques assisté par un équipement utilisateur (prg)
WO2018126473A1 (fr) Étalonnage par radio pour transmission mimo en liaison montante basée sur la réciprocité
WO2018058559A1 (fr) Acquisition d'informations d'état de canal (csi) pour transmission mimo dynamique
EP3685533B1 (fr) Signaler la conception pour le retour d'informations csi non basé sur le pmi
WO2019173970A1 (fr) Indication de filtre de réception pour émissions en liaison descendante
WO2019051825A1 (fr) Conception de signalisation destinée à un retour d'informations de csi non basé sur pmi
WO2019051633A1 (fr) Conception de signalisation destinée à un retour d'informations de csi non basé sur pmi

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 18905114

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 18905114

Country of ref document: EP

Kind code of ref document: A1