WO2019200595A1 - Procédé de communication, et dispositif de communication - Google Patents

Procédé de communication, et dispositif de communication Download PDF

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Publication number
WO2019200595A1
WO2019200595A1 PCT/CN2018/083809 CN2018083809W WO2019200595A1 WO 2019200595 A1 WO2019200595 A1 WO 2019200595A1 CN 2018083809 W CN2018083809 W CN 2018083809W WO 2019200595 A1 WO2019200595 A1 WO 2019200595A1
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Prior art keywords
antennas
antenna
terminal device
network device
information
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PCT/CN2018/083809
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English (en)
Chinese (zh)
Inventor
宋暖
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上海诺基亚贝尔股份有限公司
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Priority to CN201880091445.1A priority Critical patent/CN111886913B/zh
Priority to PCT/CN2018/083809 priority patent/WO2019200595A1/fr
Publication of WO2019200595A1 publication Critical patent/WO2019200595A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation

Definitions

  • Embodiments of the present disclosure generally relate to communication technologies and, more particularly, to methods for performing non-linear precoding and corresponding communication devices.
  • Non-linear precoding techniques may include DPC based precoding techniques such as Tomlinson Harashima Precoding (THP), QL based DPC, Zero Forced THP (ZF-THP), vector perturbation, and the like.
  • THP Tomlinson Harashima Precoding
  • ZF-THP Zero Forced THP
  • Non-linear precoding techniques have been applied in wireless communication systems, especially in the next generation of new radio (NR) systems, and further research will be conducted.
  • Non-linear precoding eg, THP
  • THP can provide significantly enhanced system performance compared to linear precoding, especially for correlated channels where the subspace of the UE overlaps.
  • nonlinear precoding techniques also have some problems. For example, since a UE usually has multiple antennas installed, and high-precision full-downlink channel state information (CSI) is obtained in order to obtain better performance of nonlinear precoding, a large amount of CSI feedback causes a very large overhead. And CSI delay. Furthermore, nonlinear precoding is generally more sensitive to CSI errors than linear precoding based on signal subspace calculations, so nonlinear precoding requires more explicit and high resolution CSI, which disadvantageously increases CSI overhead and requires Improve CSI accuracy. These are all problems that need to be solved in the current technology.
  • CSI channel state information
  • embodiments of the present disclosure propose a communication method implemented at a communication device and a corresponding communication device to improve the implementation overhead and complexity of nonlinear precoding, thereby further improving the performance of the communication system.
  • an embodiment of the present disclosure provides a communication method implemented at a terminal device.
  • the method includes determining a set of candidate antennas from a plurality of antennas at a terminal device based on pre-measured channel quality, the set of candidate antennas comprising antennas usable for non-linear precoding by a network device; and using reference signal resource indicators
  • the network device transmits information about the set of candidate antennas such that the network device determines from the set of candidate antennas a set of target antennas for performing nonlinear precoding.
  • an embodiment of the present disclosure further provides a terminal device for performing communication, including: a control unit configured to determine a candidate antenna set from a plurality of antennas at the terminal device based on a pre-measured channel quality, The set of candidate antennas includes an antenna usable for network device for nonlinear precoding; and a transmitting unit configured to transmit information about the set of candidate antennas to the network device using the reference signal resource indicator to cause the network device to be from the set of candidate antennas A set of target antennas for performing nonlinear precoding is determined.
  • Embodiments of the present disclosure also include a terminal device for communication.
  • the terminal device includes a processor and a memory storing instructions that, when executed by the processor, cause the terminal device to perform the method according to the first aspect.
  • an embodiment of the present disclosure provides a communication method implemented at a network device.
  • the method includes: acquiring information about a set of candidate antennas from a reference signal resource indicator received from a terminal device, the candidate antenna set being selected by the terminal device from a plurality of antennas at the terminal device based on a pre-measured channel quality, the candidate
  • the set of antennas includes an antenna that can be used by the network device for nonlinear precoding; a set of target antennas for performing nonlinear precoding is determined from the set of candidate antennas; and information about the set of target antennas is transmitted to the terminal device.
  • inventions of the present disclosure also provide a network device for communication.
  • the apparatus includes a control unit configured to: acquire information about a set of candidate antennas from a reference signal resource indicator received from the terminal device, the set of candidate antennas being more from the terminal device based on the pre-measured channel quality of the terminal device Selected among the antennas, the candidate antenna set includes an antenna usable for network device for nonlinear precoding, and a target antenna set for determining nonlinear precoding from the set of candidate antennas; and a transmitting unit configured to be to the terminal The device sends information about the target antenna set.
  • Embodiments of the present disclosure also include a network device for communication.
  • the network device includes a processor and a memory storing instructions that, when executed by the processor, cause the network device to perform the method according to the second aspect.
  • FIG. 1 illustrates an example communication network in which embodiments of the present disclosure may be implemented
  • FIG. 2 illustrates a flow diagram of a method implemented on a terminal device side, in accordance with certain embodiments of the present disclosure
  • FIG. 3 illustrates a flow diagram of a method implemented on a network device side, in accordance with certain embodiments of the present disclosure
  • FIG. 4 illustrates an interaction diagram of a network device and a terminal device, in accordance with certain embodiments of the present disclosure
  • FIG. 5 illustrates an interaction diagram of a network device and a terminal device in accordance with some embodiments of the present disclosure
  • FIG. 6 shows a schematic diagram of frame structure and transmission, in accordance with certain embodiments of the present disclosure
  • FIG. 9 shows a block diagram of an apparatus at a terminal device in accordance with some embodiments of the present disclosure.
  • Figure 10 illustrates a block diagram of an apparatus at a network device, in accordance with certain embodiments of the present disclosure
  • Figure 11 shows a block diagram of a device in accordance with some embodiments of the present disclosure.
  • network device refers to other entities or nodes having specific functions in a base station or a communication network.
  • a “base station” may represent a Node B (NodeB or NB), an evolved Node B (eNodeB or eNB), a new radio base station gNB, a remote radio unit (RRU), a radio head (RH), a remote radio head (RRH). , a repeater, or a low power node such as a pico base station, a femto base station, or the like.
  • the terms “network device” and “base station” are used interchangeably for purposes of discussion convenience, and may be primarily gNB as an example of a network device.
  • terminal device refers to any terminal device capable of wireless communication with or between base stations.
  • the terminal device may include a User Equipment (UE), a Terminal Equipment (MT), a Subscriber Station (SS), a Portable Subscriber Station (PSS), a Mobile Station (MS), or an Access Terminal (AT), and the above-described equipment on the vehicle.
  • UE User Equipment
  • MT Terminal Equipment
  • PSS Portable Subscriber Station
  • MS Mobile Station
  • AT Access Terminal
  • the gNB antenna selection process requires the gNB to acquire all CSIs and determine the selected antennas and/or ports (for ease of discussion, the antennas and ports are collectively referred to as "antennas" below), which increases overhead and increases timing issues. difficult.
  • the current indication of the selected antenna is explicit, such as the antenna index. If the antenna selection situation requires the use of improved CSI, such as via aperiodic CSI reporting or aperiodic sounding reference signal (SRS) transmission to obtain such CSI, then these CSIs need to be combined with an indication of the selected antenna index, This greatly increases the occupancy of the control channel and is undesirable.
  • the terminal device determines a candidate antenna set from a plurality of antennas at the terminal device based on the pre-measured channel quality, and the candidate antenna set includes an antenna usable for the network device to perform nonlinear precoding.
  • the terminal device transmits information about the set of candidate antennas to the network device using the reference signal resource indicator in the uplink control information to cause the network device to determine a set of target antennas for performing nonlinear precoding from the set of candidate antennas.
  • nonlinear precoding is only designed for the CSI of the antenna from the target antenna set, thereby simplifying the CSI acquisition process and reducing the number of CSIs that need to be acquired.
  • the reference signal resource indicator is used to indicate the information of the candidate antenna set, there is no additional field or other control signaling of the control information, thereby reducing the occupation rate of the control channel and improving system performance.
  • FIG. 1 illustrates an example communication network 100 in which embodiments of the present disclosure may be implemented.
  • Communication network 100 includes network devices (e.g., gNBs) 110 and terminal devices (e.g., UEs) 120-1, ... 120-K (hereinafter collectively referred to as terminal devices 120 or UEs 120) in communication therewith.
  • network devices e.g., gNBs
  • terminal devices e.g., UEs
  • terminal devices 120-1, ... 120-K hereinafter collectively referred to as terminal devices 120 or UEs 120
  • the communication in the communication network 100 shown in Figure 1 can be implemented in accordance with any suitable communication protocol, including but not limited to, first generation (1G), second generation (2G), third generation (3G), fourth generation.
  • Cellular communication protocols such as (4G) and fifth generation (5G), wireless local area network communication protocols such as Institute of Electrical and Electronics Engineers (IEEE) 802.11, and/or any other protocols currently known or developed in the future.
  • the communication uses any suitable wireless communication technology including, but not limited to, Code Division Multiple Access (CDMA), Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Frequency Division Duplex (FDD), Time Division Duplex. (TDD), Multiple Input Multiple Output (MIMO), Orthogonal Frequency Division Multiple Access (OFDM), and/or any other technology currently known or developed in the future.
  • CDMA Code Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • TDMA Time Division Multiple Access
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • TDD Time Division Du
  • Communication network 100 may include any suitable type and number of network devices, each network device may provide an appropriate range and an appropriate number of coverages, and communication network 100 may also include any suitable type and number of terminal devices.
  • FIG. 1 illustrates a multi-user, such as a multiple input multiple output (MIMO) system
  • MIMO multiple input multiple output
  • embodiments of the present disclosure are not limited thereto, but may be applied to other suitable systems, such as a single-user multi-antenna system. .
  • THP-based nonlinear precoding is performed at the gNB 110, and each of the K UEs has Antennas.
  • the precoding on the gNB 110 side includes a linear precoder 112 and a non-linear THP precoder 111 to suppress inter-stream and inter-user interference.
  • the UE 120 is able to select an antenna for receiving.
  • the selected antenna can be represented as an antenna selection matrix Index vector The row of the unit matrix.
  • it includes a weighting process before demodulation and decoding.
  • modulo operation Mod ( ⁇ ) channel Is based on complete CSI, where Is the total number of receive antennas from all UEs.
  • Embodiments of the present disclosure propose another mode, UE-centric antenna selection, which effectively solves the problem when the required CSI cannot be obtained.
  • Embodiments of the present disclosure employ a non-linear precoding scheme selected by a terminal device-centric antenna in which an SRS resource indicator (SRI) in the uplink/downlink signaling format is utilized. Unlike using explicit indications regarding antenna selection (ie, antenna index), embodiments of the present disclosure utilize the SRI of a particular DCI format to effectively notify each other of selected or selected/further selected antennas.
  • SRI SRS resource indicator
  • UE 120 periodically reports to the gNB the N selected antennas it wishes to use using SRI, which in the context of the present disclosure is also referred to as a set of candidate antennas.
  • SRI also implicitly represents the rank (RI) of the transport channel and can be considered an integral part of the CSI report. In this case, the SRS-based antenna switching is always enabled.
  • an SRI reference indication format is formed in downlink control information (DCI) to inform the UE 120 to receive on r antennas (r ⁇ N) suitable for data transmission among the N antennas, thereby implementing Receive process based on antenna selection.
  • DCI downlink control information
  • the UE 120 receives the downlink data according to the antenna selection from the gNB's SRI implicit indication, in such a manner that the reception combining design on the UE 120 side can be bypassed.
  • SRI has been designed to assist in beam management in conventional schemes, for example SRI can be applied in the downlink from gNB to UE to indicate the corresponding beam on the UE side.
  • SRI capable of beam indication is utilized for antenna selection, thereby providing a simple and efficient nonlinear precoding solution.
  • Embodiments of the present disclosure simplify the CSI acquisition process as compared to conventional approaches, as only CSI from selected antennas/ports requires the design of nonlinear precoding. Furthermore, in embodiments of the present disclosure, the use of SRI implicit indication antenna selection and aperiodic SRS with antenna selection can simplify the procedure and save signaling. Usually the antenna selection is indicated by higher layer signaling. If it needs to be enabled and determined by the gNB, the gNB must know the antenna index reported by the UE through some signaling, and then request which UE or antennas to apply by indicating these indexes. If it is applied with aperiodic SRS transmission for CSI acquisition, the resources of the aperiodic SRS should also be notified to the UE.
  • the demodulation related indication and the aperiodic SRS related indication should be included in the DCI, for example, the antenna index and/or SRS resources of each selected antenna, which increases the DCI utilization. Since different antennas/groups are assigned different SRS resources during the antenna switching period, the gNB can simply use the SRI to implicitly indicate to the UE the selected antenna for demodulating the data stream. In the case of aperiodic SRS transmission, a specific DCI format including SRI and aperiodic SRS triggering is preferred because the SRI includes not only information of the selected antenna but also SRS resources.
  • the explicit index of the antenna and the indication of the aperiodic SRS resource in the DCI are replaced by the SRI, thereby effectively saving signaling overhead.
  • the effects of CSI errors can be effectively reduced, making the system more robust.
  • the complexity of the UE is effectively reduced.
  • aperiodic SRS transmission and antenna selection may also be jointly triggered by using SRI, in which case m antennas among N selected antennas may be used (hereinafter also referred to as "Update antenna set"), where m ⁇ N.
  • Update antenna set m antennas among N selected antennas
  • the UE only needs to transmit the aperiodic SRS on selected antennas, for example implicitly indicated by m SRIs.
  • joint triggering of aperiodic SRS and SRI can be performed in the DCI format, thereby effectively improving system performance.
  • FIG. 3 shows a flowchart of a method 200 implemented on a terminal device side, in accordance with certain embodiments of the present disclosure. It will be appreciated that the method 200 can be implemented, for example, at the terminal device 120 as shown in FIG.
  • the terminal device 120 determines a set of candidate antennas from a plurality of antennas at the terminal device 120 based on the pre-measured channel quality.
  • the set of candidate antennas includes antennas that can be used by network devices for nonlinear precoding.
  • the terminal device 120 may acquire a pre-measured channel quality of each of the plurality of antennas at the terminal device, and then select an antenna having a channel quality higher than a threshold quality from the plurality of antennas as a candidate antenna set. The antenna in the middle.
  • the terminal device 120 transmits information about the set of candidate antennas to the network device using the reference signal resource indicator to cause the network device 110 to determine a set of target antennas for performing nonlinear precoding from the set of candidate antennas.
  • information about the set of candidate antennas may be included in the reference signal resource indicator of the uplink control information and the uplink control information is transmitted to the network device 110.
  • terminal device 120 can receive information about the set of target antennas from network device 110.
  • DCI downlink control information
  • information about the target antenna set may be obtained from reference signal resource indicators included in the downlink control information.
  • the network device 110 can measure channel information corresponding to the target antenna set based on a periodic reference signal (e.g., SRS) received from the terminal device 120.
  • Network device 110 may then non-linearly precode the data based on the measured channel information and transmit the non-linearly precoded data to terminal device 120.
  • terminal device 120 may receive non-linearly precoded data from network device 110 using antennas in the set of target antennas. The terminal device 120 can then demodulate the received data based on the demodulation reference signal for nonlinear precoding.
  • CSI for nonlinear precoding may not be accurate enough, especially for cell edge UEs.
  • the precoder needs to be updated. Therefore, network device 110 may need to obtain updated CSI through aperiodic SRS to improve the performance of nonlinear precoding.
  • the terminal device 120 transmits a reference signal to the network device 110 by updating the antennas in the set of antennas in response to receiving information about the updated antenna set from the network device.
  • the reference signal transmitted by the terminal device 120 to the network device 110 is a reference signal transmitted due to the trigger, and thus is aperiodic.
  • the network device 110 may then measure channel information corresponding to the updated antenna set based on the received reference signal, and nonlinearly precode the data based on the measured channel information and transmit to the terminal device 120.
  • non-linearly precoded data may be received from network device 110.
  • Updating the set of antennas may be determined by network device 110 from a set of candidate antennas.
  • the terminal device 120 may acquire information of the updated antenna set from the reference signal resource indicator included in the downlink control information received by the network device.
  • the CSI acquisition process can be simplified in accordance with embodiments of the present disclosure because only CSI from the selected antenna/port is required to design nonlinear precoding.
  • the use of SRI implicit indication antenna selection and aperiodic SRS with antenna selection simplifies the nonlinear precoding process and saves signaling.
  • Antenna selection schemes according to embodiments of the present disclosure are also capable of mitigating the effects of CSI errors and are more robust.
  • the reception combining phase is replaced by antenna selection, the complexity of the UE is reduced.
  • method 300 implemented on a terminal device side, in accordance with certain embodiments of the present disclosure. It will be appreciated that method 300 can be implemented, for example, at network device 110 as shown in FIG.
  • network device 110 obtains information about the set of candidate antennas from reference signal resource indicators received from terminal device 120.
  • the set of candidate antennas may be selected by the terminal device from a plurality of antennas at the terminal device based on the pre-measured channel quality.
  • the set of candidate antennas includes antennas that can be used by network devices for nonlinear precoding.
  • network device 110 may receive uplink control information including a reference signal resource indicator from terminal device 120 and obtain information about the set of candidate antennas from the reference signal resource indicator.
  • network device 110 determines a set of target antennas for performing nonlinear precoding from a set of candidate antennas.
  • the network device 110 may select an antenna with better channel information from the set of candidate antennas according to the measured channel information, and use it as an antenna in the target antenna set.
  • the network device 110 may also determine the target antenna set from the set of candidate antennas according to a preset rule or system requirement or the like.
  • network device 110 transmits information about the set of target antennas to the terminal device.
  • network device 110 may include information regarding a target antenna set in a reference signal resource indicator of downlink control information and transmit downlink control information to terminal device 120.
  • terminal device 120 may periodically transmit a reference signal, such as an SRS, to network device 110.
  • the network device 110 may measure channel information corresponding to the target antenna set based on the periodic reference signal received from the terminal device, and may perform nonlinear precoding on the data based on the measured channel information. Network device 110 may then transmit the non-linearly precoded data to terminal device 120.
  • network device 110 may determine an updated antenna set from a set of candidate antennas in response to transmitting a non-periodic reference signal.
  • Network device 110 may also transmit information regarding the updated antenna set to terminal device 120 such that terminal device 120 transmits an aperiodic reference signal to network device 110 using the antennas in the updated antenna set.
  • Information about updating the antenna set can be sent in a variety of ways.
  • the network device 110 may include information about updating the antenna set in the reference signal resource indicator of the downlink control information and transmit the downlink control information to the terminal device 120.
  • network device 110 may receive a reference signal, such as an SRS, transmitted by terminal device 120 using an antenna in the updated antenna set. Since such a reference signal is transmitted by the terminal device 120 in response to a trigger from the network device 110, it is a non-periodic reference signal.
  • the network device 110 may measure channel information corresponding to the updated antenna set based on the aperiodic reference signal received from the terminal device, and may perform nonlinear precoding on the data based on the measured channel information. Network device 110 may then transmit the non-linearly precoded data to terminal device 120.
  • the network device 110 and the terminal device 120 are described by taking gNB and UE as an example. It should be understood that this is exemplary and is not intended to limit the embodiments of the present disclosure.
  • the UE determines a set of candidate antennas and transmits information about the set of candidate antennas to the gNB.
  • the gNB then performs antenna selection based on the set of candidate antennas to determine a set of target antennas for nonlinear precoding. For ease of discussion, this process is hereinafter referred to as the "Regular Phase".
  • UE 120 continuously transmits 411 reference signals (e.g., SRS) by antenna switching to obtain CSI for all antennas at the UE.
  • the UE selects 412N antennas from all antennas of the UE as a candidate antenna set based on the channel quality measured in advance on each antenna/port.
  • the gNB 110 does not have to use the full downlink CSI, thereby avoiding the delay problem existing between CSIs obtained on different antennas in different time slots.
  • UE 120 periodically reports 413 implicit CSI using the SRI in the uplink control information to indicate to gNB 110 the N antennas in the set of candidate antennas that it wishes to use. For example, the UE may periodically feed back N SRIs in the PUCCH to indicate the N antennas to the gNB 110.
  • the gNB 110 acquires the CSI, performs scheduling, designs a linear encoder, selects r of the N preferred antennas in the candidate antenna set as the target antenna set, and designs nonlinear precoding.
  • the gNB 110 calculates the linear precoder F and constructs an antenna selection matrix T.
  • the gNB 110 designs a nonlinear precoder based on the effective channel for the feedback filter B and the feedforward filter P, wherein the effective channel H eff can be calculated as follows:
  • T represents an antenna selection matrix
  • F represents a linear precoder
  • the gNB 110 forms an antenna selection mode in the DCI format by r SRIs, implicitly indicating that the UE 120 should determine which antenna or port to select based on the SRI. Such a format is represented by antenna selection and SRI.
  • the gNB 110 transmits such an SRI to the UE 120 at 415. In this manner, gNB 110 does not have to know the antenna index of UE 120 and avoids an explicit indication of the antenna index by additional signaling. Thereby, signaling overhead can be saved.
  • This approach also provides greater flexibility for the UE 120 to apply antenna selection, for example, the UE 120 can define its own antenna indexing rules for SRS transmissions.
  • the UE 120 determines 416 g r antennas selected by the NB 110 from the SRI transmitted on the PDCCH, that is, the target antenna set. Thus, when gNB 110 transmits 417 data to UE 120, at 418, UE 120 receives data using r antennas in the set of target antennas indicated by the SRI, and weights the data by nonlinear precoding DMRS to demodulate .
  • FIG. 5 illustrates an interaction diagram of a network device and a terminal device, in accordance with certain embodiments of the present disclosure.
  • the gNB initiates an aperiodic SRS trigger, which includes information of the updated antenna set selected by the gNB.
  • the UE transmits the aperiodic SRS by using the updated antenna set according to the trigger, so that the gNB updates the channel state information according to the aperiodic SRS.
  • this process is simply referred to as the "Updated Phase" below.
  • CSI for precoding design is obtained from conventional procedures, which may not be accurate enough for nonlinear precoding, especially for cell edge UEs.
  • the precoder needs to be updated. Therefore, gNB may need to obtain updated CSI through aperiodic SRS to improve the performance of nonlinear precoding.
  • the gNB 110 may perform aperiodic SRS transmission at the UE 120 with the selected m antennas (m ⁇ N) only through the SRI trigger 511, ie, the SRI field included in the DCI format is used for Aperiodic SRS triggering is indicated, and antenna selection is included (update antenna set, which includes the m antennas selected above).
  • SRI has the same mapping as an antenna index in the case of a conventional SRS, but the selected m antennas may be different, partially identical, or identical to the r antennas selected in the conventional phase.
  • the UE 120 determines 512 to update the antenna set from the SRI and sends 513 a corresponding aperiodic SRS to the gNB 110 for updating the CSI.
  • the gNB 110 updates 514 the non-linear precoder (if the SRI is different from the regular SRI, m ⁇ r, then the linear precoder may be additionally updated) and transmits 515 the data to the UE 120.
  • the UE 120 applies an updated antenna set (i.e., the above-described r antennas) for data reception 516, and calculates the weight of the data stream and demodulates the data by nonlinear precoding DMRS.
  • Table 1 DCI format supporting UE antenna selection process
  • Antenna selection (AS) reference 0 [] 1 SRI1 (for reception based on antenna selection)
  • Table 2 DCI formats supporting aperiodic SRS transmission and UE antenna selection procedures
  • Table 1 corresponds to the regular phase, where the DCI has an antenna selection (AS) of 1 "1" and the SRI is SRI1, indicating that the gNB is applied to trigger the UE on the antenna based on the selected reception.
  • Table 2 corresponds to an update phase in which the DCI has an SRS type of "A” and SRI1 or SRI2, which is used not only to trigger aperiodic SRS transmission with antenna selection, but also to indicate based on the corresponding UE-based reception procedure Antenna selection.
  • SRI of the DCI is "empty” (denoted as "NULL” or "[]"), no changes are made to the determined selected antenna. In this case, SRI1 is actually reused, as in the case of Table 1.
  • the SRI in the DCI is SRI2, the antennas for aperiodic SRS transmission and reception are changed, that is, the antennas in the updated antenna set are not exactly the same as the previously selected antennas.
  • FIG. 6 illustrates a frame structure and transmission diagram in accordance with some embodiments of the present disclosure.
  • the UE has four transmit (Tx)/receive (Rx) antennas supporting related functions, that is, Tx antennas 0 to 3 (abbreviated as "Tx0 to Tx3”) correspond to Rx antennas 0 to 3 (referred to as "Rx0 to Rx3"). And both are mapped to 0 to 3 SRIs.
  • the UE transmits the SRS using antenna switching (from Tx0 to Tx3) so that the gNB can acquire the CSI associated with each UE antenna.
  • the gNB does not use the full downlink CSI due to the delay problem of CSI obtained at different antennas in different time slots. Therefore, the UE periodically reports the CSI by using the SRI to indicate to the gNB the antenna that is preferred by the UE to obtain better CSI, that is, the set of candidate antennas.
  • the gNB performs scheduling, determines the antenna to be used for reception by the UE, ie, the target antenna set, and precodes the data by cascading linear and non-linear precoding.
  • the gNB informs the UE of the target antenna set using the SRI in the DCI, for example, using Table 1, to ensure that the UE performs correct reception.
  • the DCI is AS1 & SRI1, where SRI1 corresponds to the selected Rx0.
  • Aperiodic SRS is triggered along with antenna selection when performance needs to be improved. If the DCI format (see Table 2) is A-SRS and null ([]), the selected antenna does not change and the indicated SRI is still SRI1, ie it points to the SRI1 field, which is shared by the indications AS1 and SRI1. In this example, the aperiodic SRS is transmitted on Tx0, while the reception by the UE still uses Rx0.
  • the DCI format (see Table 2) is A-SRS & SRI2
  • Embodiments in accordance with the present disclosure are also applicable to NR systems that use hybrid antenna arrays.
  • the "antenna" selection is a "port” selection, where the port refers to the level at the radio frequency (RF) chain and is not directly linked to the antenna element. If it is all digital, the port corresponds to the antenna. If it is one of the other hybrid array configurations, the port corresponds to the RF chain connected to multiple antenna elements).
  • the data stream is transmitted to a desired "port” where several "ports"/antennas are available at the UE.
  • an "antenna" selection may also be referred to as a "port" selection.
  • THP w./antenna selection The scheme of the embodiment of the present disclosure is simply referred to as “THP w./antenna selection”, which is compared with two existing schemes.
  • One existing scheme is simply referred to as “THP w./receive combination”, and another existing scheme is referred to as “THP w./receive combination”.
  • THP full THP
  • the linear combination is designed with THP nonlinear precoding.
  • Figures 7 and 8 respectively show cumulative distribution functions (CDF) of cell throughput obtained by different schemes for different UE configurations.
  • the number of UEs is 8 in the example of Fig. 7, and in the example of Fig. 8, the number of UEs is 16.
  • the scheme according to an embodiment of the present disclosure is superior to the scheme with receiving combinations and is very close to the full THP case. Therefore, the scheme according to an embodiment of the present disclosure can obtain similar or even better performance than a scheme requiring all downlink CSI by simple antenna selection, which is very promising for NR MIMO.
  • FIG. 9 illustrates a block diagram of an apparatus 900 at a terminal device, in accordance with certain embodiments of the present disclosure. It will be appreciated that the apparatus 900 can be implemented in the terminal device 120 shown in FIG. As shown in FIG. 9, the apparatus 900 includes: a control unit 910 configured to determine a candidate antenna set from a plurality of antennas at the terminal device based on a pre-measured channel quality, the candidate antenna set including available for a network device An antenna that performs nonlinear precoding; and a transmitting unit 920 configured to transmit information about the set of candidate antennas to the network device using a reference signal resource indicator to cause the network device to gather from the candidate antenna A set of target antennas for performing nonlinear precoding is determined.
  • a control unit 910 configured to determine a candidate antenna set from a plurality of antennas at the terminal device based on a pre-measured channel quality, the candidate antenna set including available for a network device An antenna that performs nonlinear precoding
  • a transmitting unit 920 configured to
  • control unit 910 is further configured to: acquire a pre-measured channel quality of each of the plurality of antennas at the terminal device; and select a channel quality from the plurality of antennas An antenna of a threshold quality is used as an antenna in the set of candidate antennas.
  • the transmitting unit 920 is further configured to: include information about the set of candidate antennas in a reference signal resource indicator of uplink control information; and transmit the uplink to the network device Control information.
  • apparatus 900 further includes a receiving unit configured to receive information about the target antenna set from the network device.
  • the receiving unit is further configured to: receive downlink control information from the network device; and acquire, from the reference signal resource indicator included in the downlink control information, the target antenna Collection of information.
  • the receiving unit is further configured to: receive data nonlinearly precoded by the network device using an antenna in the set of target antennas; and based on a demodulation reference signal for nonlinear precoding, The received data is demodulated.
  • the transmitting unit 920 is further configured to: in response to receiving information about the updated antenna set from the network device, transmitting, by using the antenna in the updated antenna set, a reference signal to the network device to Having the network device measure channel information corresponding to the updated antenna set based on the received reference signal and nonlinearly precoding data based on the measured channel information, the updated antenna set being by the network device Determined from the set of candidate antennas.
  • the receiving unit is also configured to receive non-linearly precoded data from the network device.
  • the information of the updated antenna set is obtained from a reference signal resource indicator included in the downlink control information received by the network device.
  • FIG. 10 shows a block diagram of an apparatus 1000 at a network device, in accordance with certain embodiments of the present disclosure. It will be appreciated that it can be implemented in the network device 110 shown in FIG.
  • the apparatus 1000 includes: a control unit 1010 configured to: acquire information about a candidate antenna set from a reference signal resource indicator received from a terminal device, the candidate antenna set being based on the terminal device Measured channel quality selected from a plurality of antennas at the terminal device, the set of candidate antennas comprising antennas usable for non-linear precoding by a network device, and determining from the set of candidate antennas for performing non- a linearly precoded set of target antennas; and a transmitting unit 1020 configured to transmit information about the set of target antennas to the terminal device.
  • a control unit 1010 configured to: acquire information about a candidate antenna set from a reference signal resource indicator received from a terminal device, the candidate antenna set being based on the terminal device Measured channel quality selected from a plurality of antennas at the terminal device, the
  • apparatus 1000 further includes a receiving unit configured to receive uplink control information including the reference signal resource indicator from the terminal device; and obtain information about the reference signal resource indicator Information about the set of candidate antennas.
  • the transmitting unit 1020 is further configured to include information about the target antenna set in a reference signal resource indicator of downlink control information; and transmit the downlink control to the terminal device information.
  • control unit 1010 is further configured to: measure channel information corresponding to the target antenna set based on a periodic reference signal received from the terminal device; and compare data based on the measured channel information Perform nonlinear precoding.
  • the transmitting unit 1020 is further configured to transmit the non-linearly precoded data to the terminal device.
  • control unit 1010 is further configured to determine an updated antenna set from the set of candidate antennas in response to transmitting a non-periodic reference signal to be triggered.
  • the transmitting unit 1020 is further configured to send information about the updated antenna set to the terminal device, so that the terminal device sends the aperiodic reference signal to the network device by using an antenna in the updated antenna set. .
  • the transmitting unit 1020 is further configured to: include information about the updated antenna set in a reference signal resource indicator of downlink control information; and transmit the downlink to the terminal device Control information.
  • the receiving unit is further configured to receive a reference signal transmitted by the terminal device using an antenna in the updated antenna set.
  • the control unit 1010 is further configured to measure channel information corresponding to the updated antenna set based on the received reference signal; and perform nonlinear precoding on the data based on the measured channel information.
  • the transmitting unit 1020 is further configured to transmit the non-linearly precoded data to the terminal device.
  • each of the units described in apparatus 900 and apparatus 1000 correspond to the steps in methods 200 and 300 described with reference to FIGS. 2 and 3, respectively. Accordingly, the operations and features described above in connection with Figures 2 and 3 are equally applicable to device 900 and device 1000 and the units contained therein, and have the same effect, the details of which are not described again.
  • apparatus 900 and apparatus 1000 can be implemented in a variety of manners, including software, hardware, firmware, or any combination thereof.
  • one or more units may be implemented using software and/or firmware, such as machine executable instructions stored on a storage medium.
  • apparatus 900 and some or all of the units of apparatus 1000 may be implemented, at least in part, by one or more hardware logic components.
  • exemplary types of hardware logic components include Field Programmable Gate Array (FPGA), Application Specific Integrated Circuit (ASIC), Application Specific Standard (ASSP), System on Chip (SOC), Complex Programmable Logic Device (CPLD), and so on.
  • a base station or terminal device can implement methods 200 and 300 using its transmitter, receiver, transceiver, and/or processor or controller.
  • FIG. 11 shows a block diagram of an apparatus 1100 suitable for implementing embodiments of the present disclosure.
  • Device 1100 can be used to implement a network device or terminal device, such as network device 110 and terminal device 120 shown in FIG.
  • device 1100 includes a controller 1110.
  • Controller 1110 controls the operation and functionality of device 1100.
  • controller 1110 can perform various operations with the aid of instructions 1130 stored in memory 1120 coupled thereto.
  • Memory 1120 can be of any suitable type suitable for use in a local technology environment and can be implemented using any suitable data storage technology, including but not limited to semiconductor-based memory devices, magnetic memory devices and systems, optical memory devices, and systems. Although only one memory unit is shown in FIG. 11, there may be multiple physically different memory units in device 1100.
  • Controller 1110 may be of any suitable type suitable for use in a local technical environment and may include, but is not limited to, general purpose computers, special purpose computers, microcontrollers, digital signal controllers (DSPs), and controller-based multi-core controller architectures. One or more multiple. Device 1100 can also include multiple controllers 1110. Controller 1110 is coupled to transceiver 1140, which can receive and transmit information by means of one or more antennas 1150 and/or other components.
  • controller 1110 and transceiver 1140 can operate in conjunction to implement method 200 described above with respect to FIG.
  • the controller 1110 is configured to determine a candidate antenna set from a plurality of antennas at the terminal device based on pre-measured channel quality, the candidate antenna set including an antenna usable for network device for nonlinear precoding.
  • the transceiver 1140 is configured to transmit information about the set of candidate antennas to the network device with a reference signal resource indicator to cause the network device to determine from the set of candidate antennas for performing nonlinear precoding Target antenna collection.
  • the controller 1110 is further configured to: acquire a pre-measured channel quality of each of the plurality of antennas at the terminal device; and select a channel quality from the plurality of antennas An antenna of a threshold quality is used as an antenna in the set of candidate antennas.
  • the transceiver 1140 is further configured to include information about the set of candidate antennas in a reference signal resource indicator of uplink control information; and transmit the uplink to the network device Control information.
  • the transceiver 1140 is further configured to receive information about the set of target antennas from the network device.
  • the transceiver 1140 is further configured to: receive downlink control information from the network device; and obtain information about the target from a reference signal resource indicator included in the downlink control information Information about the antenna collection.
  • the transceiver 1140 is further configured to: receive data non-linearly precoded by the network device using an antenna in the set of target antennas; and based on a demodulation reference signal for nonlinear precoding Demodulating the received data.
  • the transceiver 1140 is further configured to: in response to receiving information from the network device regarding updating the set of antennas, transmitting an reference signal to the network device using the antenna in the updated antenna set to Having the network device measure channel information corresponding to the updated antenna set based on the received reference signal and nonlinearly precoding data based on the measured channel information, the updated antenna set being by the network device Determined from the set of candidate antennas.
  • the receiving unit is further configured to receive data that is nonlinearly precoded from the network device.
  • the information of the updated antenna set is obtained from a reference signal resource indicator included in the downlink control information received by the network device.
  • controller 1110 and transceiver 1140 can operate in conjunction to implement method 300 described above with respect to FIG.
  • the controller 1110 is configured to acquire information about a candidate antenna set from a reference signal resource indicator received from the terminal device, the candidate antenna set being the terminal device from the terminal device based on a pre-measured channel quality Selected at a plurality of antennas, the set of candidate antennas includes an antenna that is usable for network device for nonlinear precoding; and a set of target antennas for performing nonlinear precoding from the set of candidate antennas.
  • the transceiver 1140 is configured to transmit information about the target antenna set to the terminal device.
  • the transceiver 1140 is further configured to receive uplink control information including the reference signal resource indicator from the terminal device; and obtain information about the candidate antenna from the reference signal resource indicator Collection of information.
  • the transceiver 1140 is further configured to include information about the target antenna set in a reference signal resource indicator of downlink control information; and transmit the downlink control to the terminal device information.
  • the controller 1110 is further configured to: measure channel information corresponding to the target antenna set based on a periodic reference signal received from the terminal device; and compare data based on the measured channel information Perform nonlinear precoding.
  • the transceiver 1140 is also configured to transmit the non-linearly precoded data to the terminal device.
  • the controller 1110 is further configured to determine an updated antenna set from the set of candidate antennas in response to triggering transmission of the aperiodic reference signal.
  • the transceiver 1140 is further configured to transmit information about the updated antenna set to the terminal device, such that the terminal device transmits the aperiodic reference signal to the network device by using an antenna in the updated antenna set .
  • the transceiver 1140 is further configured to: include information regarding the updated antenna set in a reference signal resource indicator of downlink control information; and transmit the downlink to the terminal device Control information.
  • the transceiver 1140 is further configured to receive a reference signal transmitted by the terminal device using an antenna in the updated antenna set.
  • the controller 1110 is further configured to measure channel information corresponding to the updated antenna set based on the received reference signal; and perform nonlinear precoding on the data based on the measured channel information.
  • the transceiver 1140 is also configured to transmit the non-linearly precoded data to the terminal device.
  • the various example embodiments of the present disclosure can be implemented in hardware or special purpose circuits, software, logic, or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which can be executed by a controller, microprocessor or other computing device.
  • firmware or software which can be executed by a controller, microprocessor or other computing device.
  • embodiments of the present disclosure may be described in the context of machine-executable instructions, such as in a program module that is executed in a device on a real or virtual processor of a target.
  • program modules include routines, programs, libraries, objects, classes, components, data structures, and the like that perform particular tasks or implement particular abstract data structures.
  • the functionality of the program modules may be combined or divided between the described program modules.
  • Machine-executable instructions for program modules can be executed within a local or distributed device. In a distributed device, program modules can be located in both local and remote storage media.
  • Computer program code for implementing the methods of the present disclosure can be written in one or more programming languages.
  • the computer program code can be provided to a general purpose computer, a special purpose computer or a processor of other programmable data processing apparatus such that the program code, when executed by a computer or other programmable data processing apparatus, causes a flowchart and/or block diagram.
  • the functions/operations specified in are implemented.
  • the program code can execute entirely on the computer, partly on the computer, as a stand-alone software package, partly on the computer and partly on the remote computer or entirely on the remote computer or server.
  • a machine-readable medium can be any tangible medium that contains or stores a program for or relating to an instruction execution system, apparatus, or device.
  • the machine readable medium can be a machine readable signal medium or a machine readable storage medium.
  • a machine-readable medium can include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination thereof. More detailed examples of machine readable storage media include electrical connections with one or more wires, portable computer disks, hard disks, random access memory (RAM), read only memory (ROM), erasable programmable read only Memory (EPROM or flash memory), optical storage device, magnetic storage device, or any suitable combination thereof.

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

Abstract

Un mode de réalisation de la présente invention concerne un procédé de communication, et un dispositif de communication. Un procédé de communication implémenté sur un dispositif terminal consiste à : déterminer, sur la base d'une qualité de canal pré-mesurée, un ensemble d'antennes candidates parmi une pluralité d'antennes au niveau d'un dispositif terminal, l'ensemble d'antennes candidates comprenant des antennes qui peuvent être utilisées par un dispositif de réseau pour exécuter un précodage non linéaire ; et utiliser un indicateur de ressource de signal de référence et envoyer des informations relatives à l'ensemble d'antennes candidates au dispositif de réseau de sorte que le dispositif de réseau détermine, parmi l'ensemble d'antennes candidates, un ensemble d'antennes cible utilisé pour exécuter un précodage non linéaire.
PCT/CN2018/083809 2018-04-19 2018-04-19 Procédé de communication, et dispositif de communication WO2019200595A1 (fr)

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CN201880091445.1A CN111886913B (zh) 2018-04-19 2018-04-19 通信方法和通信设备
PCT/CN2018/083809 WO2019200595A1 (fr) 2018-04-19 2018-04-19 Procédé de communication, et dispositif de communication

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