WO2022115391A1 - Procédé d'acquisition de csi dl assisté par srs pour architecture d'émetteur-récepteur 4t6r - Google Patents

Procédé d'acquisition de csi dl assisté par srs pour architecture d'émetteur-récepteur 4t6r Download PDF

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Publication number
WO2022115391A1
WO2022115391A1 PCT/US2021/060384 US2021060384W WO2022115391A1 WO 2022115391 A1 WO2022115391 A1 WO 2022115391A1 US 2021060384 W US2021060384 W US 2021060384W WO 2022115391 A1 WO2022115391 A1 WO 2022115391A1
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WO
WIPO (PCT)
Prior art keywords
aps
srs
terminal
configuration information
configuration
Prior art date
Application number
PCT/US2021/060384
Other languages
English (en)
Inventor
Nadisanka Rupasinghe
Yuki Matsumura
Original Assignee
Ntt Docomo, Inc.
Docomo Innovations, Inc.
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 Ntt Docomo, Inc., Docomo Innovations, Inc. filed Critical Ntt Docomo, Inc.
Publication of WO2022115391A1 publication Critical patent/WO2022115391A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/44—Transmit/receive switching
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated

Definitions

  • One or more embodiments disclosed herein relate to a method of sounding reference signal (SRS)-assisted downlink (DL) channel state information (CSI) acquisition for up to 8 antenna ports.
  • SRS sounding reference signal
  • DL downlink
  • CSI channel state information
  • NR new radio
  • the current new radio (NR) standard supports SRS switching for only up to 4 antennas.
  • the NR standard begins to contemplate how to identify the requirement of supporting SRS switching for up to 8 antennas in NR multiple-input and multiple-output (MIMO) technologies for Rel. 17.
  • one or more embodiments disclosed herein relate to terminal in communication with a base station (BS) that includes a plurality of antenna ports (APs) coupled to a transmitter that transmits one or more sounding reference signals (SRSs) to the BS and a processor that controls switching of the plurality of APs for the one or more SRS transmissions.
  • the plurality of APs comprises at least 8 APs.
  • the plurality of APs have a 4T6R configuration.
  • the processor further controls the switching based on a configuration information.
  • the configuration information is predetermined.
  • the configuration information is signaled by Downlink Control Information (DCI) or higher-layer signaling.
  • DCI Downlink Control Information
  • an allocated power differs for the plurality of APs based on an SRS configuration information.
  • one or more embodiments disclosed herein relate to a method for a terminal in communication with a base station (BS) that includes transmitting, using a plurality of antenna ports (APs), one or more sounding reference signals (SRSs) to the BS; and [0019] controlling switching of the plurality of APs for the one or more SRS transmissions.
  • BS base station
  • APs antenna ports
  • SRSs sounding reference signals
  • FIG. 1 shows an example of a UE transceiver architecture 2T4R.
  • FIG. 2 shows an example antenna structure.
  • FIG. 3 shows an example of a SRS resource configuration.
  • FIG. 4 shows an example of SRS transmissions.
  • FIG. 5 shows an example of AP combinations for transmitting SRS.
  • FIG.6 shows an example transceiver architecture and an example SRS resource configuration.
  • FIG. 7 shows an example antenna structure.
  • FIG. 8 shows an example SRS resource configuration.
  • FIG.9 shows an example of a wireless communication system according to one or more embodiments.
  • FIG. 10 shows an example of a configuration of a BS according to one or more embodiments.
  • FIG.11 shows an example of a configuration of a UE according to one or more embodiments.
  • DETAILED DESCRIPTION [0034] Embodiments of the present invention will be described in detail below with reference to the drawings. Like elements in the various figures are denoted by like reference numerals for consistency. [0035] In the following description of embodiments of the invention, numerous specific details are set forth in order to provide a more thorough understanding of the invention. However, it will be apparent to one of ordinary skill in the art that the invention may be practiced without these specific details. In other instances, well-known features have not been described in detail to avoid obscuring the invention. In the below discussion, although alternative embodiments are discussed one skilled in the art will appreciate that various embodiments or alternatives may be combined.
  • FIG. 1 shows an example of UE transceiver architecture for 2T4R (i.e., 2 Tx ports, 4 Rx ports).
  • the UE is configured with 2 SRS resources each with 2-ports (equal to the number of Tx ports).
  • up to two SRS resource sets may be configured with a different value for the higher layer parameter resourceType in SRS- ResourceSet set, where each SRS resource set has two SRS resources transmitted in different symbols. Additionally, each SRS resource in a given set consisting of two SRS ports and the SRS port pair of the second resource are associated with a different UE antenna port pair than the SRS port pair of the first resource.
  • an example antenna structure has 4 transceivers and 6 Rx antenna ports (APs).
  • AP 2 , AP 3 , AP 4 , and AP 5 are connected to two of the transceiver (Tx) chains via an RF switching network.
  • Fig. 3 describes an example SRS resource configuration.
  • Fig. 3 shows an SRS resource set having two SRS resources each with 4-ports. Each port in a given SRS resource may be uniquely associated with an antenna port (AP).
  • APs for multiple SRS transmissions are pre-configured in the specification(s), e.g., APs with the x largest (smallest) port indices are associated with SRS resource 1 whereas the x smallest (largest) port indices are associated with SRS resource 2.
  • x can be pre-determined in the specification(s) or higher-layer configured.
  • Second Embodiment Alternative 1 examples are described of a NW configuration of antenna ports for multiple SRS transmission. Using higher-layer signaling or x-bits in DCI, the NW explicitly configures APs for multiple SRS transmission, e.g., using bits in DCI where N AP and P are the number of available APs and the number of ports for multiple SRS transmissions, respectively. In this example, the NW explicitly configures which APs should transmit SRS multiple times.
  • Second Embodiment Alternative 3 In an alternative implementation of the Second Embodiment, with periodic/semi-persistent SRS resources, the NW can assign different APs for multiple SRS transmissions at different time occasions. An example is shown in Fig. 5.
  • AP combinations for transmitting SRS two times at different time occasions are in the following order: ⁇ AP 2 , AP 3 ⁇ , ⁇ AP 0 , AP 1 ⁇ , ⁇ AP 4 , AP 5 ⁇ .
  • the alternative implementations of the Second Embodiment also may implement one or more of the following options.
  • the NW configures which APs transmit SRS two times within the initial slot. Afterwards, based on some pre-defined rule, a UE can switch to other AP combinations in subsequent slots in a cycle.
  • the NW configures the order of AP combinations for multiple SRS transmissions at different time slots within a cycle.
  • the NW configures the order of AP combinations for multiple SRS transmissions at different time slots within a cycle.
  • Third Embodiment Alternative 1 In an alternative implementation of the Third Embodiment, using x-bits within its capability reporting, the UE explicitly reports which APs can achieve multiple SRS transmission, e.g., using bits where N AP and P are the number of available APs and number of ports for multiple SRS transmission, respectively, and the UE explicitly reports to the NW which APs can perform multiple SRS transmissions.
  • each AP gets only one opportunity to transmits SRS (i.e., unlike the previous case where 2 APs transmit SRS two times.)
  • AP " , AP # , AP and AP ! are associated with a 4-port SRS resource while AP 4 and AP 5 are associated with a 2-port SRS resource.
  • the association of APs with SRS resources are pre-configured in the specification(s), e.g., the two APs with the x largest (smallest) port indices out of 4 APs connected via RF switching network are associated with the 2-port SRS resource.
  • x can be pre-determined in the specification(s) or higher-layer configured.
  • the NW explicitly configures APs for 2-port or 4-port SRS transmission, e.g., using bits in DCI, the NW explicitly configures two out of four APs connected via an RF switching network, with a 2-port SRS resource.
  • the NW explicitly configures APs for 2-port or 4-port SRS transmission, e.g., the NW explicitly configures ⁇ AP 2 , AP 3 ⁇ out of AP 2 , AP 3 , AP 4 , AP 5 with a 2-port SRS resource using the bitmap: 1100.
  • the NW explicitly configures ⁇ AP 2 , AP 3 ⁇ out of AP 2 , AP 3 , AP 4 , AP 5 with a 2-port SRS resource using the bitmap: 1100.
  • Fifth Embodiment Alternative 3 In an alternative implementation of the Fifth Embodiment, during its capability reporting, a UE explicitly or implicitly reports which APs can be associated with a 2-port SRS resource.
  • Sixth Embodiment examples are described of Power Allocation for 4-port and 2-port SRS Transmissions.
  • a same power allocation may be provided for all APs irrespective of the number of ports in each SRS resource, e.g., assuming total available power is P, each AP can be assigned P/4 power. This means, for 4-port SRS resource transmission, the total available power P is used whereas for 2-port SRS resource transmission, only P/2 power is used.
  • Sixth Embodiment Alternative 1 In an alternative implementation of the Sixth Embodiment, it is possible to allocate different power for different APs based on the number of ports in each SRS resource, e.g., assuming total power available is P, each AP associated with a 4-port SRS resource is allocated with P/4 power, while each AP associated with 2-port SRS resource is allocated with P/2 power. This means, for both 4-port and 2-port SRS resource transmissions that the total available power can be used.
  • Seventh Embodiment [0091] According to a Seventh Embodiment, an example antenna structure has 4 transceivers and 6 APs. In embodiments in accordance with Fig.
  • Fig. 8 describes an example SRS resource configuration.
  • Fig. 8 shows an SRS resource set having two SRS resources each with 4-ports. Each port in a given SRS resource is uniquely associated with an AP. Note here that, with this SRS resource configuration, two APs (out of 6 available APs) have to transmit a SRS two times.
  • FIG. 9 is a wireless communications system 1 according to one or more embodiments of the present invention.
  • the wireless communication system 1 includes a UE 10, a BS 20, and a core network 30.
  • the wireless communication system 1 may be a NR system.
  • the wireless communication system 1 is not limited to the specific configurations described herein and may be any type of wireless communication system such as an LTE/LTE-Advanced (LTE-A) system.
  • LTE-A LTE/LTE-Advanced
  • the BS 20 may communicate uplink (UL) and downlink (DL) signals with the UE 10 in a cell of the BS 20.
  • the DL and UL signals may include control information and user data.
  • the BS 20 may communicate DL and UL signals with the core network 30 through backhaul links 31.
  • the BS 20 may be gNodeB (gNB).
  • the BS 20 may be referred to as a network (NW) 20.
  • the BS 20 may transmit DL signals such as a CSI-RS and DCI.
  • the BS 20 includes antennas, a communication interface to communicate with an adjacent BS 20 (for example, X2 interface), a communication interface to communicate with the core network 30 (for example, S1 interface), and a CPU (Central Processing Unit) such as a processor or a circuit to process transmitted and received signals with the UE 10.
  • Operations of the BS 20 may be implemented by the processor processing or executing data and programs stored in a memory.
  • the BS 20 is not limited to the hardware configuration set forth above and may be realized by other appropriate hardware configurations as understood by those of ordinary skill in the art. Numerous BSs 20 may be disposed so as to cover a broader service area of the wireless communication system 1.
  • the UE 10 may communicate DL and UL signals that include control information and user data with the BS 20 using Multi Input Multi Output (MIMO) technology.
  • the UE 10 may be a mobile station, terminal, mobile terminal, user terminal, a smartphone, a cellular phone, a tablet, a mobile router, or information processing apparatus having a radio communication function such as a wearable device.
  • the wireless communication system 1 may include one or more UEs 10.
  • the UE 10 may transmit UL signals such as an SRS and CSI report.
  • the UE 10 includes a CPU such as a processor, a RAM (Random Access Memory), a flash memory, and a radio communication device to transmit/receive radio signals to/from the BS 20 and the UE 10.
  • FIG. 10 is a diagram illustrating a schematic configuration of the BS 20 according to embodiments of the present invention.
  • the BS 20 may include a plurality of antennas (antenna element group) 201, amplifier 202, transceiver (transmitter/receiver) 203, a baseband signal processor 204, a call processor 205 and a transmission path interface 206.
  • antennas antennas (antenna element group) 201
  • amplifier 202 transceiver (transmitter/receiver) 203
  • baseband signal processor 204 baseband signal processor
  • call processor 205 a transmission path interface 206.
  • signals are subjected to Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer transmission processing such as division and coupling of user data and RLC retransmission control transmission processing, Medium Access Control (MAC) retransmission control, including, for example, HARQ transmission processing, scheduling, transport format selection, channel coding, inverse fast Fourier transform (IFFT) processing, and precoding processing.
  • PDCP Packet Data Convergence Protocol
  • RLC Radio Link Control
  • MAC Medium Access Control
  • HARQ transmission processing scheduling, transport format selection, channel coding, inverse fast Fourier transform (IFFT) processing, and precoding processing.
  • the baseband signal processor 204 notifies each UE 10 of control information (system information) for communication in the cell by higher layer signaling (e.g., Radio Resource Control (RRC) signaling and broadcast channel).
  • Information for communication in the cell includes, for example, UL or DL system bandwidth.
  • RRC Radio Resource Control
  • Each transceiver 203 baseband signals that are precoded per antenna and output from the baseband signal processor 204 are subjected to frequency conversion processing into a radio frequency band.
  • the amplifier 202 amplifies the radio frequency signals having been subjected to frequency conversion, and the resultant signals are transmitted from the antennas 201.
  • radio frequency signals are received in each antennas 201, amplified in the amplifier 202, subjected to frequency conversion and converted into baseband signals in the transceiver 203, and are input to the baseband signal processor 204.
  • the baseband signal processor 204 performs FFT processing, IDFT processing, error correction decoding, MAC retransmission control reception processing, and RLC layer and PDCP layer reception processing on the user data included in the received baseband signals. Then, the resultant signals are transferred to the core network through the transmission path interface 206.
  • the call processor 205 performs call processing such as setting up and releasing a communication channel, manages the state of the BS 20, and manages the radio resources.
  • Call processing such as setting up and releasing a communication channel
  • FIG. 11 is a schematic configuration of the UE 10 according to embodiments of the present invention.
  • the UE 10 has a plurality of UE antenna S101, amplifiers 102, the circuit 103 comprising transceiver (transmitter/receiver) 1031, the controller 104, and an application 105.
  • radio frequency signals received in the UE antenna S101 are amplified in the respective amplifiers 102, and subjected to frequency conversion into baseband signals in the transceiver 1031. These baseband signals are subjected to reception processing such as FFT processing, error correction decoding and retransmission control and so on, in the controller 104.
  • the DL user data is transferred to the application 105.
  • the application 105 performs processing related to higher layers above the physical layer and the MAC layer.
  • broadcast information is also transferred to the application 105.
  • UL user data is input from the application 105 to the controller 104.
  • retransmission control (Hybrid ARQ) transmission processing, channel coding, precoding, DFT processing, IFFT processing and so on are performed, and the resultant signals are transferred to each transceiver 1031.
  • the transceiver 1031 the baseband signals output from the controller 104 are converted into a radio frequency band. After that, the frequency-converted radio frequency signals are amplified in the amplifier 102, and then, transmitted from the antenna 101.
  • Hybrid ARQ Hybrid ARQ

Abstract

Un terminal qui est en communication avec une station de base (BS) est également divulgué. Le terminal comprend une pluralité de ports d'antenne (AP) couplés à un émetteur-récepteur qui émet un ou plusieurs signaux de référence de sondage (SRS) à la BS et un processeur qui commande la commutation de la pluralité d'AP pour la ou les émissions de SRS. Selon d'autres aspects, un procédé destiné à un terminal et un système sont également divulgués.
PCT/US2021/060384 2020-11-24 2021-11-22 Procédé d'acquisition de csi dl assisté par srs pour architecture d'émetteur-récepteur 4t6r WO2022115391A1 (fr)

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US202063117707P 2020-11-24 2020-11-24
US63/117,707 2020-11-24

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019160775A1 (fr) * 2018-02-14 2019-08-22 Qualcomm Incorporated Commutation d'antenne de signal de référence de sondage dans des entités programmées possédant au moins quatre antennes
CN111262679A (zh) * 2020-01-17 2020-06-09 展讯通信（上海）有限公司 Srs资源的配置方法、系统、设备、介质及基站

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019160775A1 (fr) * 2018-02-14 2019-08-22 Qualcomm Incorporated Commutation d'antenne de signal de référence de sondage dans des entités programmées possédant au moins quatre antennes
CN111262679A (zh) * 2020-01-17 2020-06-09 展讯通信（上海）有限公司 Srs资源的配置方法、系统、设备、介质及基站

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