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WO2017026863A1 - Procédé et appareil d'émission et de réception de signal de référence dans un système de communication - Google Patents

Procédé et appareil d'émission et de réception de signal de référence dans un système de communication Download PDF

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Publication number
WO2017026863A1
WO2017026863A1 PCT/KR2016/008940 KR2016008940W WO2017026863A1 WO 2017026863 A1 WO2017026863 A1 WO 2017026863A1 KR 2016008940 W KR2016008940 W KR 2016008940W WO 2017026863 A1 WO2017026863 A1 WO 2017026863A1
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WIPO (PCT)
Prior art keywords
csi
reference signal
configuration information
terminal
transmitting
Prior art date
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Ceased
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PCT/KR2016/008940
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English (en)
Korean (ko)
Inventor
노지환
김태영
유현일
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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Priority claimed from KR1020160102619A external-priority patent/KR102574954B1/ko
Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Priority to US15/751,388 priority Critical patent/US10651989B2/en
Publication of WO2017026863A1 publication Critical patent/WO2017026863A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation

Definitions

  • the present disclosure discloses an apparatus and method for transmitting or receiving a reference signal in a communication system.
  • a 5G communication system or a pre-5G communication system is called a system of a Beyond 4G network or a Long Term Evolution (LTE) system.
  • LTE Long Term Evolution
  • 5G communication systems are being considered for implementation in the ultra-high frequency (mmWave) band (e.g., 60 gigabyte (60 GHz) band).
  • mmWave ultra-high frequency
  • FD-MIMO massive array multiple input and output
  • FD-MIMO full dimensional MIMO
  • 5G communication systems have advanced small cells, advanced small cells, cloud radio access network (cloud RAN), ultra-dense network (ultra-dense network) Device to device communication (D2D), wireless backhaul, moving network, cooperative communication, coordinated multi-points, and interference cancellation
  • cloud RAN cloud radio access network
  • ultra-dense network ultra-dense network
  • D2D Device to device communication
  • wireless backhaul moving network
  • cooperative communication coordinated multi-points
  • interference cancellation interference cancellation
  • ACM advanced coding modulation
  • SWM hybrid FSK and QAM modulation
  • SWSC sliding window superposition coding
  • FBMC filter bank multi carrier
  • SAP NOMA Non-orthogonal multiple access
  • SCMA sparse code multiple access
  • a user equipment reports channel state information between the terminal and the base station to the base station in order to communicate with the base station (eNodeB or eNB).
  • the base station transmits a channel state information-reference signal (CSI-RS, hereinafter referred to as 'CSI-RS') to the terminal.
  • CSI-RS channel state information-reference signal
  • the present disclosure is to provide a BF-CSI-RS transmission scheme for the base station to support a plurality of terminals in the FD-MIMO system.
  • BF-CSI-RS beamformed CSI-RS
  • CSI-RS means a CSI-RS transmitted to a specific terminal.
  • a method of receiving a reference signal may include receiving configuration information about a reference signal, determining whether aperiodic transmission of the reference signal is indicated based on the configuration information, and requesting measurement of the reference signal. Receiving a signal, if the request for measuring the received reference signal is aperiodic, measuring a reference signal based on the configuration information, and generating channel state information based on the measurement result of the reference signal And transmitting the channel state information.
  • a method of transmitting a reference signal according to the present disclosure may include transmitting configuration information about the reference signal to be aperiodically transmitted, transmitting a signal for requesting the reference signal measurement, and a channel state for the reference signal. Receiving information.
  • An apparatus for receiving a reference signal includes a transceiver for receiving configuration information about a reference signal, receiving a signal for requesting the reference signal measurement, and transmitting channel state information, based on the configuration information. It is determined whether aperiodic transmission of the reference signal is instructed, and if the received request for measuring the reference signal is aperiodic, the reference signal is measured based on the configuration information, and based on the measurement result of the reference signal. And a controller for generating channel state information.
  • An apparatus for transmitting a reference signal transmits configuration information about the reference signal to be transmitted aperiodically, transmits a signal for requesting measurement of the reference signal, and receives channel state information about the reference signal. And a control unit for controlling the transmission and reception unit.
  • 1 is a diagram illustrating a resource pattern of CSI-RS according to the number of antenna ports
  • FIG. 2 is a diagram illustrating a CSI reporting by a terminal using a plurality of CSI-RSs received from a base station;
  • FIG. 3 illustrates an embodiment in which a base station allocates orthogonal CSI-RS resources to each terminal in a cell and transmits a BF-CSI-RS according to the present disclosure
  • FIG. 4 is a diagram illustrating an embodiment of transmitting a CSI-RS configuration additionally allocated by a base station for each terminal group in a cell according to the present disclosure
  • FIG. 5 is a diagram illustrating a radio resource control (RRC) message for transmitting UE group CSI-RS subframe configuration information to an MS as an example;
  • RRC radio resource control
  • FIG. 6 illustrates a method of allocating CSI-RS resources based on a shared CSI-RS candidate pool according to the present disclosure
  • FIG. 7 is a flowchart illustrating a terminal according to an embodiment of the present disclosure.
  • FIG. 8 is a flowchart illustrating a base station according to an embodiment of the present disclosure.
  • FIG. 9 illustrates a configuration of a terminal according to an embodiment of the present disclosure.
  • FIG. 10 is a diagram illustrating a configuration of a base station according to an embodiment of the present disclosure.
  • a base station is a subject for transmitting a reference signal to a terminal, and may be at least one of an eNode B, a Node B, a base station (BS), a wireless access unit, a base station controller, or a node on a network.
  • the terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smartphone, a computer, or a multimedia system capable of performing a communication function.
  • Embodiments of the present disclosure will be described based on the CSI-RS, but this description can be applied to other reference signals. For example, it may be applied to channel state information-interference measurement (CSI-IM).
  • CSI-IM channel state information-interference measurement
  • the base station may transmit CSI-RS to the terminal using one, two, four, or eight antenna ports.
  • 1 is a diagram illustrating a pattern of a CSI-RS according to the number of antenna ports on a resource.
  • a resource region corresponding to a CSI-RS port is mapped on a resource region including 14 orthogonal frequency division (OFDM) symbols on a horizontal axis and 12 subcarriers on a vertical axis.
  • OFDM orthogonal frequency division
  • the terminal When a CSI reference signal configuration (or CSI reference signal configuration) number of the CSI-RS configuration (or configuration) is transmitted to the terminal by a higher layer signal, the terminal identifies the resource location to which the CSI-RS is mapped through Table 1. The number of CSI-RS antenna ports can be determined. The resource location of the CSI-RS allocated to the UE by the CSI-RS configuration is the same for each resource block pair (RBP) and for each subframe.
  • RBP resource block pair
  • k 'and l' denote a subframe index and a subcarrier index, respectively, and n s denotes a subframe.
  • Table 2 is a table used to define the position of a subframe in which the CSI-RS exists.
  • Table 2 shows a period (T CSI - RS ) and an offset ( ⁇ CSI-RS ) in which CSI-RS is repeatedly transmitted on a subframe.
  • the terminals belonging to a cell use the same CSI-RS resources. That is, cell-specific CSI-RS is transmitted.
  • the terminal measures the CSI-RS transmitted by the base station even without a specific indication.
  • the terminal reports the channel state information (CSI) generated based on the measurement value of the CSI-RS to the base station. This is called CSI reporting, and the CSI reporting is divided into periodic reporting and aperiodic reporting.
  • the CSI may include at least one of a channel quality indicator (CQI), a precoding matrix indicator (PMI), and a rank indicator (RI).
  • CQI channel quality indicator
  • PMI precoding matrix indicator
  • RI rank indicator
  • the UE may configure the CSI using measurement values for several recently received CSI-RSs instead of one CSI-RS.
  • FIG. 2 is a diagram illustrating an operation of reporting CSI using a plurality of CSI-RSs received from a base station.
  • three CSI-RS measurement values used for one CSI 201 report are 211, 213, and 215, and a measurement window is used to measure CSI-RS measurement units for such CSI reporting. window) 221.
  • the measurement window of the terminal may be set differently according to implementation characteristics of each terminal or according to the environment of each terminal.
  • a base station i.e., a transmitting device transmits a UE-specific beamforming (UE) to transmit a CSI-RS to a specific terminal (i.e., a receiving device).
  • UE UE-specific beamforming
  • a CSI-RS transmission method is called a beamformed CSI-RS (hereinafter, referred to as a 'BF-CSI-RS') method
  • a CSI-RS transmitted by a base station to a specific user equipment is called a BF-CSI-RS.
  • the BF-CSI-RS has an advantage that the base station can improve the CSI-RS measurement performance by sending a beamforming (beamforming) suitable for a specific terminal.
  • the subframe in which the BF-CSI-RS is to be transmitted should be pre-configured, and the BF-CSI-RS may be periodically transmitted in units of subframes. Since the BF-CSI-RS has a characteristic unique to the terminal, the base station should assign resources for different BF-CSI-RS to each of the terminals in the cell. However, if the number of UEs to transmit the BF-CSI-RS in the cell increases, the overhead for the resource may increase. Accordingly, there is a need for a method for transmitting BF-CSI-RS for supporting a plurality of terminals.
  • the present disclosure is to provide a BF-CSI-RS transmission scheme for the base station to support a plurality of terminals in the FD-MIMO system. Since the BF-CSI-RS is not at all different from the CSI-RS, the BF-CSI-RS and the CSI-RS may be used interchangeably below.
  • the base station allocates CSI-RS resources, i.e., resources for transmitting BF-CSI-RS, to each UE for UE-specific BF-CSI-RS transmission.
  • the CSI-RS resource may include a CSI-RS configuration and a CSI-RS subframe configuration.
  • the terminal measures the CSI-RS to configure the CSI.
  • the terminal sets a measurement window to increase the accuracy of the CSI-RS measurement, and configures and reports the CSI using the CSI-RSs received within the set measurement window.
  • a base station allocates orthogonal CSI-RS resources to each user equipment for BF-CSI-RS transmission.
  • the orthogonal CSI-RS resource means different CSI-RS configurations or different CSI-RS subframes allocated to respective terminals. Orthogonal CSI-RS resources may be used even if the base station sets one of the CSI-RS configuration and the CSI-RS subframe configuration differently to each terminal. Therefore, at least one of the CSI-RS configuration and the CSI-RS subframe configuration of each UE allocated to the orthogonal CSI-RS resource may be different from each other.
  • the base station transmits information on the CSI-RS configuration and the CSI-RS subframe configuration allocated to each terminal through a higher layer signal.
  • Each terminal estimates and measures the CSI-RS allocated to the terminal using the received signal.
  • Each terminal configures and reports the CSI to the base station based on the measurement result of the CSI-RS.
  • the base station can easily transmit UE-specific BF-CSI-RS by allocating orthogonal CSI-RS resources to each terminal.
  • FIG. 3 is a diagram illustrating an operation of a base station allocating orthogonal CSI-RS resources to each terminal in a cell and transmitting a BF-CSI-RS according to an embodiment of the present disclosure.
  • the base station allocates a CSI-RS configuration or a CSI-RS subframe configuration to K terminals.
  • the CSI-RS subframe configuration indicating the CSI-RS subframes 311, 313, 315, and 317 allocated to the first terminal 301 by the base station and the CSI allocated to the second terminal 303.
  • the CSI-RS subframe configuration indicating the -RS subframes 321, 323, 325, and 327 is the same.
  • the CSI-RS configuration 341 allocated to the first terminal 301 by the base station is different from the CSI-RS configuration 343 assigned to the second terminal 303.
  • the CSI-RS configuration 343 allocated to the second terminal 303 by the base station and the CSI-RS configuration 345 allocated to the third terminal 305 are the same.
  • the CSI-RS subframe configuration indicating the CSI-RS subframes 321, 323, 325, and 327 allocated to the second terminal 303 by the base station and the third terminal 305 are allocated.
  • the CSI-RS subframe configuration indicating the CSI-RS subframes 331, 333, 335, and 337 is different.
  • a period (hereinafter, referred to as a 'CSI-RS period') 353 for transmitting the CSI-RS indicated by the CSI-RS subframe configuration of the third terminal 305 is the second terminal 303.
  • the offset 351 of the CSI-RS subframe configuration of the third terminal 305 is the CSI-RS subframe of the second terminal 303 even if the same as the CSI-RS period of the CSI-RS subframe configuration. If different from the offset of the configuration, the second terminal 303 and the third terminal 305 is considered to have different CSI-RS subframe configuration.
  • orthogonal CSI-RS resources are allocated to UEs in a cell as shown in FIG. 3, as the number of UEs in a cell increases, overhead for CSI-RS resources increases.
  • a method for mitigating the overhead problem a method of setting a long CSI-RS period of each UE may be considered.
  • the frequency at which each terminal reports CSI to the base station decreases. If the frequency of reporting the CSI is reduced, a problem may arise in that the channel state at the time of data transmission and reception and the channel state at the time of channel measurement are mismatched.
  • the embodiment is not excluded from the present invention.
  • another embodiment according to the present disclosure additionally or in parallel allocates CSI-RS resources for each group of terminals. It is assumed that terminals belonging to a specific terminal group use the same CSI-RS configuration. In addition, UEs belonging to the specific UE group share a CSI-RS subframe configuration, that is, a CSI-RS subframe configuration for each UE group. The base station may allocate CSI-RS subframes within the terminal group CSI-RS subframe configuration to each terminal.
  • FIG. 4 is a diagram illustrating an embodiment of transmitting a CSI-RS configuration additionally allocated by a base station for each terminal group in a cell according to the present disclosure.
  • the first terminal group in the cell includes the first terminal 401, the second terminal 403,. And a K-th terminal 405.
  • the base station may allocate the CSI-RS configuration and the CSI-RS subframe configuration differently to each of the first terminal 401, the second terminal 403, and the K-th terminal 405.
  • the CSI-RS period may be set long to solve the overhead problem.
  • the base station may further allocate a CSI-RS configuration for the first terminal group.
  • the CSI-RS configuration of the terminals 401, 403, and 405 belonging to the first terminal group and the CSI-RS configuration of the first terminal group may be identical or different.
  • the CSI-RS subframe configuration of all the UEs belonging to the first UE group is included in the CSI-RS subframe configuration of the first UE group, but is not necessarily included.
  • the base station transmits a CSI-RS to the terminal in which the problem occurs and receives a CSI report.
  • the CSI-RS transmitted by the base station when necessary is one of the CSI-RSs included in the CSI-RS subframe configuration of each UE group of the group to which the problem occurs.
  • the first terminal 401 periodically receives the CSI-RSs 411 and 413 according to the configured CSI-RS configuration and the CSI-RS subframe configuration.
  • the base station determines that the channel state according to the CSI reported by the first terminal 401 does not match the actual channel state, the base station determines that the CSI- is uniquely assigned to the first terminal 401 by the terminal.
  • unscheduled CSI-RSs 425 and 427 included in the CSI-RS subframe configuration of the first terminal group to which the first terminal 401 belongs may be additionally transmitted.
  • the base station transmits a signal to transmit the CSI-RS to the first terminal 401 to receive the CSI from the first terminal 401.
  • the signal may be an aperiodic CSI trigger (AP-CSI trigger) signal.
  • the first CSI-RS 425 additionally transmitted to the first terminal 401 together with the aperiodic CSI trigger signal is not transmitted to any of the terminals belonging to the first terminal group
  • the second CSI-RS 427 additionally transmitted to the first terminal 401 together with the aperiodic CSI trigger signal may be allocated to the K-th terminal 405 by the base station. In this case, a collision situation of the CSI-RS may occur.
  • the first terminal 401 recognizes that the CSI-RS 427 that is not intended for the user is newly allocated, and measures the newly allocated CSI-RS 427. can do.
  • the K-th terminal 405 will recognize the CSI-RS 427 newly allocated to the first terminal 401 as the CSI-RS 429 allocated to the first terminal 401. In this situation, if there is no additional indication to the K-th terminal 405, the K-th terminal 405 determines that the CSI-RS 427 transmitted to the first terminal 401 is its own. This can cause problems to include in the measurement window. Although there may be a problem, the above embodiment is not excluded from the present invention.
  • the shorter the UE group CSI-RS period the higher the degree of freedom for AP-CSI reporting of the base station. Since the CSI-RS is transmitted only when all CSI-RSs of the UE group CSI-RS subframe configuration are actually transmitted to the UEs belonging to the UE group, the UE group CSI-RS period is short. If you do, it will not actually increase the overhead. Therefore, the CSI-RS period of the CSI-RS subframe configuration for each UE group is preferably short. For example, referring to Table 2, the CSI-RS subframe configuration may be set to zero. In this case, the UE group CSI-RS subframe configuration may be set to transmit the CSI-RS in all subframes.
  • FIG. 5 illustrates an example of a radio resource control (RRC) message for transmitting UE group CSI-RS subframe configuration information to UE.
  • RRC radio resource control
  • the RRC message includes CSI-RS-ConfigNZP information including UE group CSI-RS subframe configuration information, and CSI-RS-ConfigNZP information includes a csi-RS-ConfigNZId indicating a CSI-RS configuration number. , An antennaPortsCount indicating the number of antenna ports, a resourceConfig indicating a CSI-RS resource configuration, a subframeConfig indicating a CSI-RS subframe configuration, and a scramblingIdentity indicating a scrambling identifier.
  • the base station operates one CSI process and two CSI-RS subframe configurations for each terminal.
  • the CSI process refers to a series of processes from the base station transmitting the CSI-RS to the terminal to receive the CSI from the base station until the CSI is reported from the terminal.
  • the base station operates one CSI-RS subframe configuration per one CSI process for one UE.
  • a new CSI process may be defined such that the base station can configure two CSI-RS subframe configurations in order to operate two CSI-RS subframe configurations in one CSI process for one UE. Or, it may be changed to use two CSI-RS subframe configurations in an existing CSI process. One of the two CSI-RS subframe configurations may be used for UE group CSI-RS subframe configuration.
  • the UE periodically reports the CSI for the UE-specific CSI-RS subframe configuration, and reports the CSI to the base station aperiodically for the CSI-RS subframe configuration for each UE group.
  • the UE basically performs CSI-RS measurement according to the UE-specific CSI-RS subframe configuration, but if the AP-CSI trigger signal is transmitted from the base station, the AP-CSI interval (from the time the AP-CSI trigger signal is transmitted) CSI-RS according to the UE group CSI-RS subframe configuration existing between CRS reporting time) is added to the measurement window. That is, the measurement of the UE group CSI-RS subframe configuration is not basically performed. As described above, only when the AP-CSI trigger signal is transmitted, the CSI-RS according to the CSI-RS subframe configuration in the corresponding section is performed. Reflect RS in the measurement.
  • the base station when the base station attempts to transmit an aperiodic CSI-RS that is not scheduled to the UE, the base station performs AP-CSI triggering timing so that the corresponding CSI-RS subframe is included in the AP-CSI report. Should be set. Since the AP-CSI trigger signal also includes the meaning of the measurement indication for the UE group CSI-RS subframe, the AP-CSI triggering timing should be equal to or higher than the unscheduled CSI-RS subframe.
  • the first method is to limit the measurement window in the UE by one subframe. Even if a CSI-RS collision occurs, if the measurement window is 1, the base station does not have to give an additional instruction to a terminal (eg, K-th terminal in FIG. 4) to which a UE-specific CSI-RS is allocated. Limiting the measurement window to one subframe may reduce CSI-RS measurement accuracy, but is the simplest method to solve the measurement window related problem that may occur when transmitting BF-CSI-RS.
  • the second is a method of informing the UE of a measurement reset point using a DCI format.
  • the base station may instruct the terminal assigned the UE-specific CSI-RS to reset the measurement in the next CSI-RS subframe of the CSI-RS collision. That is, a new measurement is started in the next CSI-RS subframe of the CSI-RS collision. Since the second method does not impose a constraint on the measurement window to the terminal except for the measurement reset, the second method has a higher degree of freedom than the first method in terms of implementation of the terminal.
  • Third is a method of not specifying a measurement limit to the terminal.
  • the third method is a method of giving the terminal the maximum degree of freedom for CSI-RS measurement.
  • the base station may ignore the CSI report of the UE for several subframes, that is, for a predetermined time, that is, do not reflect the scheduling.
  • the base station may operate two CSI processes for each terminal.
  • the first CSI process is a CSI process for UE specific CSI-RS configuration
  • the second CSI process is a CSI process for UE group CSI-RS configuration.
  • the first CSI process supports both periodic and aperiodic CSI reporting.
  • the UE measures and reports the CSI-RS according to the UE-specific CSI-RS subframe configuration.
  • the second process since the second process only needs aperiodic CSI reporting for unscheduled CSI-RS, it is not necessary to perform periodic CSI reporting. Therefore, there is a need for a scheme for the second process, that is, a scheme for reporting CSI aperiodically.
  • Table 3 shows the CSI reporting period that the terminal periodically reports to the base station according to the higher layer signal.
  • I CQI / PMI is an index for a CSI reporting period
  • N pd is a CSI reporting period
  • I CQI / PMI 317 or 542 ⁇ I CQI / PMI ⁇ 1023 the period is not defined the CSI reporting cycle (N pd).
  • a setting in which the period is infinite meaning not reporting CSI
  • the terminal may not perform periodic CSI reporting for the terminal group CSI process.
  • the second process assumes to perform CSI-RS measurement for AP-CSI reporting.
  • each UE may know the UE group CSI-RS subframe configuration using the UE group CSI process, but does not know whether a specific subframe included in the UE group CSI-RS subframe configuration is allocated to another UE.
  • the measurement window in the second process is set in units of one subframe.
  • the base station tries to transmit the unscheduled CSI-RS to the terminal, it instructs the AP-CSI trigger signal to the second process.
  • the second process since the second process is measuring the CSI-RS, it is also possible to indicate the AP-CSI trigger signal after an unscheduled CSI-RS subframe.
  • the unit of the second measurement window is one subframe.
  • CSI-RS measurement restriction methods in each terminal described above may be applied.
  • Another embodiment of the present disclosure is a method of distinguishing periodic CSI-RS resources from aperiodic CSI-RS resources.
  • the difference from the above-described embodiments is that UE-specific periodic CSI-RS resources and CSI-RS resources shared by a plurality of UEs use different CSI-RS configurations.
  • the CSI-RS resources shared by the plurality of terminals are referred to as “shared CSI-RS candidate pools” and are used as aperiodic CSI-RS resources.
  • CSI-RSs in the shared CSI-RS candidate pool may be regarded as aperiodic CSI-RSs because they are not periodically allocated to themselves from the viewpoint of a specific UE.
  • FIG. 6 is a diagram illustrating a method of allocating CSI-RS resources based on a shared CSI-RS candidate pool according to the present disclosure.
  • each terminal receives periodic CSI-RS configuration information and CSI-RS configuration information for a shared CSI-RS candidate pool from an eNB through an RRC message.
  • the base station may allocate a corresponding subframe in the shared CSI-RS candidate pool to the specific terminal by transmitting an AP-CSI trigger signal (or CSI request signal) to the specific terminal.
  • the CSI-RS configuration 621 of the UE and the CSI-RS configuration 623 in the shared CSI-RS candidate pool of another UE are different, the CSI-RS collision is allocated to the same subframe. This does not happen.
  • the base station may utilize a CSI request field of downlink control information (DCI) to allocate an aperiodic CSI-RS.
  • DCI downlink control information
  • the CSI request signal is for triggering CSI reporting, but further includes a function of allocating aperiodic CSI-RS, so that the base station can perform aperiodic CSI-RS allocation and request for CSI reporting at once with one DCI indication.
  • the base station is aperiodic CSI-RS configuration CSI- RS of the RRC message - can be added to the ConfigNZP.
  • CSI- RS of the RRC message - can be added to the ConfigNZP.
  • the first approach is to set both the CSI-RS configuration (ie, CSI-RS location in the subframe) and the CSI-RS subframe configuration (subframe period and offset) for the aperiodic CSI-RS resource.
  • periodic CSI-RS resources may or may not exist.
  • the first option is to allocate an aperiodic CSI-RS to a CSI-RS subframe candidate indicated by DCI or a first CSI-RS subframe candidate indicated by DCI among CSI-RS subframe candidates through the CSI-RS subframe configuration.
  • the second option is to allocate the aperiodic CSI-RS to the CSI-RS subframe candidate closest to the subframe indicated by the DCI among the CSI-RS subframe candidates through the CSI-RS subframe configuration.
  • the aperiodic CSI-RS is allocated to the same subframe as the subframe indicated by the DCI or subsequent subframes according to the first option, and also to a subframe before the DCI indicated by the second option.
  • Aperiodic CSI-RS may be allocated.
  • the second method is to set only CSI-RS configuration for aperiodic CSI-RS resources. Since the base station does not set up a CSI-RS subframe configuration, it is possible to assign an aperiodic CSI-RS to any subframe. An aperiodic CSI-RS is allocated to a subframe indicated by DCI.
  • the first scheme and the second scheme are methods for distinguishing periodic CSI-RS resources from aperiodic CSI-RS resources.
  • the third method is to configure one or more CSI-RS resources to the UE and to activate or deactivate each CSI-RS resource.
  • both CSI-RS configuration ie, CSI-RS location in a subframe
  • CSI-RS subframe configuration ie, CSI-RS location in a subframe
  • CSI-RS subframe configuration ie, CSI-RS location in a subframe
  • CSI-RS subframe configuration ie, CSI-RS location in a subframe
  • CSI-RS subframe configuration period and offset
  • the CSI-RS resource is activated or deactivated using the indication of the DCI, and this is referred to as a CSI-RS activation field ('CSI-RS activation field') for convenience.
  • 'CSI-RS activation field' There are two options for activating or deactivating CSI-RS resources using the CSI-RS activation field.
  • the base station allocates the CSI-RS according to the CSI-RS resource configuration after the first DCI activation for the CSI-RS activation ('CSI-RS activation'). In addition, the base station does not allocate the CSI-RS after deactivation of the second indication of the DCI.
  • the number of bits of the 'CSI-RS activation field' is determined according to the number of CSI-RS resources. For example, if the number of CSI-RS resources is N, the number of bits is becomes
  • '1' or '0' is indicated through the CSI-RS activation field to indicate activation or deactivation of the CSI-RS resource.
  • the UE determines that the CSI-RS resource is activated when the command is '1', and determines that the CSI-RS resource is inactivated when the command is '0'.
  • the number of bits of the 'CSI-RS activation field' in the second option is determined according to the number of CSI-RS resources. If the number of CSI-RS resources is N, the number of bits becomes N.
  • the fourth method is to inform the base station by setting whether the corresponding CSI-RS resources are periodic or aperiodic when the base station transmits CSI-RS resource configuration through the RRC message. If the set CSI-RS resources are periodic, the terminal operates in the same manner as the conventional scheme, and if the CSI-RS resources are aperiodic, the terminal may operate in any of the above-described embodiments. In addition, the number of CSI-RS resources configured by the base station in one CSI process may be one or more.
  • Parameters required for the CSI-RS resource configuration may be set semi-fixed. Such a method may be referred to as a semi-static parameter configuration method. This method sets the parameters via an RRC message.
  • the base station may set parameters such as the number of CSI-RS ports, the CSI-RS configuration, the CSI-RS subframe configuration, etc. to the UE through the RRC message.
  • Another method is a method of dynamically setting one or more of parameters required for CSI-RS resource configuration through DCI.
  • Parameters that can be set through the DCI may be the number of CSI-RS ports, the CSI-RS configuration, and the like.
  • the base station can change the number of CSI-RS ports using the DCI. If the base station supports 2, 4, 8, or 12 CSI-RS ports, the number of CSI-RS ports may be indicated using 2 bits of the DCI.
  • the base station may change the CSI-RS configuration. That is, N CSI-RS configurations may be set per CSI-RS resource using the RRC message, and one CSI-RS configuration among the N may be selected through DCI.
  • a method for solving the overhead and rate matching due to the introduction of aperiodic CSI-RS will be described. Since the aperiodic CSI-RS is not periodically allocated, a method for using a subframe to which the actual CSI-RS is not allocated as a physical downlink shared channel (PDSCH) is needed. In addition, when aperiodic CSI-RS is allocated to a specific UE, a method for preventing other UEs from interpreting the aperiodic CSI-RS resource as a PDSCH is needed.
  • PDSCH physical downlink shared channel
  • a terminal is a scheme for recognizing a set aperiodic CSI-RS resource as a PDSCH.
  • the first terminal When the first terminal is allocated an aperiodic CSI-RS in the kth subframe using the DCI, the first terminal assumes that the CSI-RS exists in the kth subframe. However, since other UEs do not know whether a CSI-RS exists in the kth subframe, the UE may recognize the CSI-RS transmitted in the kth subframe as a PDSCH signal. In order to prevent this, when aperiodic CSI-RS is allocated to a specific terminal, a new DCI field is required for informing the corresponding information to other terminals except the specific terminal.
  • the DCI field will be referred to as 'Dynamic ZP CSI-RS'.
  • the specific UE may interpret that the aperiodic CSI-RS is assigned to another UE.
  • a terminal is a scheme for recognizing a set aperiodic CSI-RS resource as a CSI-RS. If the aperiodic CSI-RS resource is not allocated to any one UE, the subframe reserved for the aperiodic CSI-RS resource may be allocated. In order to prevent this, when aperiodic CSI-RS is not allocated to any UE, a DCI field is required to allow UEs assigned a corresponding subframe to PDSCH to recognize aperiodic CSI-RS resources as data through DCI. . In the present disclosure, the DCI field will be referred to as 'data mapping'. When a specific UE is instructed to 'data mapping' through DCI, the UE may interpret the aperiodic CSI-RS resource as its own data.
  • FIG. 7 is a flowchart illustrating a terminal according to an embodiment of the present disclosure.
  • the terminal receives a CSI-RS resource configuration through an RRC message from the base station (701).
  • the terminal determines whether the received CSI-RS resource configuration indicates an aperiodic CSI-RS resource (703).
  • the terminal receives a DCI indication.
  • the terminal may determine that an aperiodic CSI-RS is allocated to a specific subframe based on the DCI indication (705).
  • the DCI indication may be CSI request bits included in the DCI.
  • the terminal receives and measures the CSI-RS in a subframe corresponding to the DCI based on the aperiodic CSI-RS resource (707).
  • the terminal generates a CSI and reports it to the base station based on the measurement result of the CSI-RS (709).
  • the UE receives a DCI indication (711).
  • the DCI indication may be CSI request bits included in DCI.
  • the terminal measures the CSI-RS in a subframe corresponding to the DCI based on the periodic CSI-RS resources (713).
  • the terminal performs step 709 described above.
  • FIG. 8 is a flowchart illustrating a base station according to an embodiment of the present disclosure.
  • the base station transmits configuration information on a reference signal to be transmitted aperiodically to the terminal (801).
  • the base station transmits a signal for requesting the reference signal measurement (803).
  • the base station receives 805 channel state information for the reference signal.
  • FIG. 9 illustrates a configuration of a terminal according to an embodiment of the present disclosure. For convenience of description, components that are not directly related to the present disclosure will not be shown and described.
  • the terminal 900 may include a controller 901 and a transceiver 903.
  • the control unit 901 and the transceiver unit 903 are described as being performed. However, if necessary, all operations may be performed in one configuration. It may also be divided into more components.
  • the transceiver 903 receives information related to CSI-RS from a base station, for example, CSI-RS configuration, CSI-RS subframe configuration, CSI-RS, etc., and reports CSI to the base station.
  • the controller 901 may perform not only the operation of the transceiver 903 but also all operations described in the present disclosure, such as generating a CSI.
  • FIG. 10 is a diagram illustrating a configuration of a base station according to an embodiment of the present disclosure. For convenience of description, components that are not directly related to the present disclosure will not be shown and described.
  • the base station 1000 may include a controller 1001 and a transceiver 1003.
  • the controller 1001 and the transmitter / receiver 1003 are described as being performed separately. However, if necessary, all operations may be performed in one configuration. It may also be divided into more components.
  • the transceiver 1003 transmits CSI-RS related information, for example, CSI-RS configuration, CSI-RS subframe configuration, CSI-RS, etc., to the terminal and receives CSI report from the terminal.
  • CSI-RS related information for example, CSI-RS configuration, CSI-RS subframe configuration, CSI-RS, etc.
  • the controller 1001 may not only control the operation of the transceiver 1003 but also perform all the operations described in the present disclosure.

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

Abstract

L'invention concerne un système de communication 5G ou pré-5G permettant de prendre en charge un débit de transmission de données supérieur à celui d'un système de communication 4G tel que LTE. Un procédé de réception d'un signal de référence, selon la présente invention, comprend les étapes consistant : à recevoir des informations de configuration sur un signal de référence ; à déterminer si la transmission apériodique du signal de référence est ordonnée sur la base des informations de configuration ; à recevoir un signal pour demander une mesure du signal de référence ; à mesurer le signal de référence sur la base des informations de configuration lorsque la demande de mesure de signal de référence reçue est apériodique ; à générer des informations d'état de canal sur la base du résultat mesuré du signal de référence ; et à transmettre les informations d'état de canal.
PCT/KR2016/008940 2015-08-13 2016-08-12 Procédé et appareil d'émission et de réception de signal de référence dans un système de communication Ceased WO2017026863A1 (fr)

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WO2021129556A1 (fr) * 2019-12-25 2021-07-01 维沃移动通信有限公司 Procédé et dispositif d'indication csi-rs

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