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WO2016119325A1 - Procédé et système de mesure et de rétroaction de csi ainsi que station de base - Google Patents

Procédé et système de mesure et de rétroaction de csi ainsi que station de base Download PDF

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Publication number
WO2016119325A1
WO2016119325A1 PCT/CN2015/077995 CN2015077995W WO2016119325A1 WO 2016119325 A1 WO2016119325 A1 WO 2016119325A1 CN 2015077995 W CN2015077995 W CN 2015077995W WO 2016119325 A1 WO2016119325 A1 WO 2016119325A1
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WIPO (PCT)
Prior art keywords
csi
period
csi measurement
feedback
downlink channel
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PCT/CN2015/077995
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English (en)
Chinese (zh)
Inventor
李明菊
朱亚军
张云飞
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Yulong Computer Telecommunication Scientific Shenzhen Co Ltd
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Yulong Computer Telecommunication Scientific Shenzhen Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a channel detection method when an LTE system operates in an unlicensed frequency band, a channel detection system when the LTE system operates in an unlicensed frequency band, and a base station.
  • 3GPP is discussing how to use unlicensed spectrum, such as the 2.4 GHz and 5 GHz bands, with the help of licensed spectrum.
  • unlicensed spectrum are currently mainly used in systems such as Wi-Fi, Bluetooth, radar, and medical.
  • LAA Licensed Assisted Access
  • the unlicensed spectrum can work in two modes. One is the downlink (SDL), that is, only the downlink transmission subframe, and the other is the TDD (Time Division duplex) mode, which includes the downlink transmission.
  • SDL downlink
  • TDD Time Division duplex
  • the subframe also includes an uplink transmission subframe. This situation can only be supplemented by the carrier aggregation technology (as shown in Figure 1).
  • the TDD mode can be used independently of DC (Dual Connectivity).
  • LTE systems operating in unlicensed bands have the ability to provide higher spectral efficiency and greater coverage, while allowing data traffic to be in licensed bands and unlicensed based on the same core network. Seamless switching between right bands. For the user, this means a better broadband experience, higher speed, better stability and mobility.
  • Wi-Fi Wireless Fidelity
  • CSMA/CD Carrier Sense Multiple Access/Collision Detection
  • the basic principle of this method is Wi-Fi. Before the AP (Access Point) or the terminal sends signaling or data, it must first monitor whether other APs or other terminals are transmitting/receiving signaling or data. If so, continue to listen until it is monitored. If not, a random number is generated as the backoff time. If no signaling or data transmission is detected during this backoff time, the AP or the terminal may start transmitting signaling or data after the end of the backoff time. The process is shown in Figure 2.
  • CSMA/CD Carrier Sense Multiple Access/Collision Detection
  • the LTE network has good orthogonality to ensure the interference level, the uplink and downlink transmissions between the base station and the user do not need to consider whether other base stations or other users are transmitting data. If LTE is used on an unlicensed band, it does not consider whether other devices are using unlicensed bands nearby, which will cause great interference to Wi-Fi devices. Because LTE transmits as long as there is traffic, there is no monitoring rule, then the Wi-Fi device cannot transmit when LTE has service transmission, and can only detect the channel idle state for data transmission after the LTE service transmission is completed.
  • LTE Long Before Talk
  • the LBT detection repetition period is 10 ms, and the LBT detection subframe is 1 ms.
  • the LBT detection channel is idle, indicating that the surrounding interference is small, and other subframes in this period can be occupied.
  • the LBT detection channel in the second cycle is busy, indicating that the surrounding interference is very large, and other subframes in this period cannot be occupied.
  • the CSI information includes a CQI (Channel Quality Indicator), an RI (Rank Indicator), and a PMI (Precoding Matrix Indicator).
  • CQI Channel Quality Indicator
  • RI Rank Indicator
  • PMI Precoding Matrix Indicator
  • the present invention is based on the above problems, and proposes a new technical solution, which can ensure the normal implementation of CSI measurement and CSI feedback after the introduction of the LBT mechanism in the unlicensed frequency band of the LTE system, and ensure that when the latest CSI information has not been obtained yet.
  • the CSI information can be obtained, so that the base station can select a more suitable modulation and coding mode, and further improve the spectrum efficiency and channel usage.
  • an aspect of the present invention provides a CSI measurement and feedback method for an LTE system when operating in an unlicensed frequency band, and is used by the base station side, including: when a downlink service arrives, detecting a current downlink channel state, and according to Transmitting, by the current downlink channel state, CSI measurement configuration signaling and CSI feedback configuration signaling corresponding to the current downlink channel state to the terminal; or transmitting CSI measurement corresponding to the specified downlink channel state to the terminal when a downlink service arrives
  • the signaling and the CSI feedback configuration signaling are configured to enable the terminal to perform CSI measurement and CSI feedback according to CSI measurement configuration signaling and CSI feedback configuration signaling corresponding to the downlink channel state after learning the downlink channel state.
  • the CSI measurement and the CSI feedback configuration signaling corresponding to the current downlink channel state are sent to the terminal, or when the downlink channel state is unknown, Transmitting CSI measurement and CSI feedback configuration signaling corresponding to the specified downlink channel state to the terminal, so that the terminal performs CSI measurement and CSI detection according to the corresponding CSI measurement and CSI feedback configuration signaling after learning the downlink channel state, so that The CSI measurement and the CSI feedback are normally performed after the LBT mechanism is introduced in the unlicensed frequency band to ensure the spectrum efficiency and the channel usage rate.
  • the specified downlink channel state includes the downlink channel busy state or the downlink channel idle state.
  • the sending corresponds to the current downlink channel state.
  • the method further includes: setting CSI corresponding to the downlink channel busy state and the downlink channel idle state, respectively. Measurement configuration signaling and CSI feedback configuration signaling.
  • the configuration content of the CSI measurement configuration signaling and the CSI feedback configuration signaling corresponding to the downlink channel busy state specifically includes: a first signal indicating that the terminal is used for CSI measurement, and the first CSI measurement time and frequency position, first CSI measurement period, first CSI feedback time, and first CSI feedback period; and configuration content of CSI measurement configuration signaling and CSI feedback configuration signaling corresponding to the downlink channel idle state
  • the method includes: a second signal indicating the CSI measurement by the terminal, a second CSI measurement time and frequency position, a second CSI measurement period, a second CSI feedback time, and a second CSI feedback period.
  • CSI measurement configuration signaling and CSI feedback configuration signaling corresponding to the downlink channel state (downlink channel busy and downlink channel idle), and CSI measurement configuration signaling and CSI corresponding to the downlink channel busy state are set.
  • the configuration content of the feedback configuration signaling includes, but is not limited to, a first signal indicating the CSI measurement by the terminal (a signal for CSI measurement), a first CSI measurement time and a frequency position, a first CSI measurement period, and a first
  • the CSI measurement configuration time and the first CSI feedback period, the configuration content of the CSI measurement configuration signaling and the CSI feedback configuration signaling corresponding to the downlink channel idle state includes, but is not limited to: a second signal indicating that the terminal is used for CSI measurement (using The CSI measured time and frequency position, the second CSI measurement period, the second CSI feedback time, and the second CSI feedback period are corresponding to the CSI measurement and feedback signaling by configuring the downlink channel state and configuring Corresponding main content, to clearly indicate whether the CSI
  • the first signal indicating that the terminal is used for CSI measurement comprises one or a combination of the following: a PSS/SSS signal transmitted in a first cycle, and a CRS signal transmitted in a second cycle. a CSI-RS signal transmitted in a third period and a DRS signal transmitted in a fourth period; the first CSI measurement time and frequency position being a first transmission time of the signal indicating that the terminal is used for CSI measurement a frequency position; the first CSI measurement period is greater than or equal to a maximum of the first period, the second period, the third period, and the fourth period One cycle of the first CSI feedback period is greater than or equal to the first CSI measurement period; and the second signal indicating that the terminal is used for CSI measurement includes one or a combination of the following: sending according to the fifth cycle PSS/SSS signal, CRS signal transmitted in the sixth cycle, CSI-RS signal transmitted in the seventh cycle, and DRS signal transmitted in the eighth cycle; the second CSI measurement time and frequency position is the second
  • the configuration content of the CSI measurement configuration signaling and the CSI feedback configuration signaling corresponding to the downlink channel busy state and the downlink channel idle state specifically includes: performing the CSI measurement aperiodically. And the CSI feedback.
  • the signal indicating the CSI measurement by the first indication terminal corresponding to the downlink channel busy state includes but is not limited to one or a combination of the following: PSS/SSS (Primary Synchronization) transmitted in the first cycle (large cycle) Signal, Secondary Synchronization Signal (Secondary Synchronization Signal) signal, CRS (Common Reference Signal) signal transmitted in the second period (large period), CSI transmitted in the third period (large period) An RS (Channel State Information-Reference Signal) signal and a DRS (Discovery Reference Signal) signal transmitted in a fourth period (large period), and a second indication corresponding to a downlink channel idle state
  • the signal used by the terminal for CSI measurement includes but is not limited to one or a combination of the following: a PSS/SSS signal transmitted in a fifth cycle (small cycle), a CRS signal transmitted in a sixth cycle (small cycle), and a seventh cycle.
  • the period, the third period, and the fourth period that is, the terminal can be notified to perform CSI measurement and CSI feedback in multiple manners; and the start time of the CSI measurement and feedback corresponding to the downlink channel busy state and the downlink channel idle state (first CSI measurement time) And the frequency position and the second CSI measurement time and frequency position) are respectively a transmission time indicating a signal used by the terminal for CSI measurement and a subframe number and a subcarrier position for CSI measurement given in the signaling; and the downlink channel is busy or
  • the CSI feedback period corresponding to the downlink idle state is greater than the CSI measurement period, and the CSI measurement period is greater than or equal to the largest one of the first period, the second period, the third period, and the fourth period, and the fifth period and the sixth period, respectively.
  • the largest one of the seventh and eighth periods; and CS can be detected when the uplink channel is idle or the channel status is uncertain.
  • I feedback that is, the CSI feedback time can be arbitrarily set; of course, CSI measurement and CSI feedback can also be performed non-periodically.
  • CSI measurement and feedback can be performed based on which signals are explicitly determined. And clarify the time and period of CSI measurement and feedback, thereby effectively ensuring the normal operation of CSI measurement and CSI feedback after the LTE system introduces the LBT mechanism in the unlicensed band.
  • CSI measurement configuration signaling, CSI feedback configuration signaling, and CSI feedback corresponding to the downlink channel busy state and the downlink channel idle state are sent on the unlicensed band or the licensed band. information.
  • CSI measurement configuration signaling and CSI feedback configuration signaling corresponding to different downlink channel states, and CSI information that needs feedback after the terminal performs CSI measurement may be sent on an unlicensed band or a licensed band, to Improve spectrum efficiency and channel utilization.
  • the downlink channel busy state or the CSI measurement configuration signaling and CSI feedback configuration signaling of a downlink channel idle state preferably, when the channel detection is repeatedly performed on the unlicensed frequency band in a fixed period, the downlink channel busy state or the CSI measurement configuration signaling and CSI feedback configuration signaling of a downlink channel idle state; or when receiving the downlink service, performing downlink channel detection on the unlicensed frequency band and detecting that the downlink channel is idle, according to Determining, by the RRC signaling, the MAC signaling, and/or the DCI signaling, the CSI measurement time and the frequency location are determined by the RRC signaling, the MAC signaling, and/or the DCI signaling manner, and the downlink channel is idle. State CSI measurement configuration signaling and CSI feedback configuration signaling.
  • downlink channel detection (based on FBE (Framed based equipment) LBT mechanism) is repeated in a fixed period on an unlicensed frequency band, that is, channel detection time is periodically repeated, and CSI measurement is performed at this time.
  • the time and frequency position such as the subframe number, are relatively easy to indicate to the terminal, that is, the direct RRC (Radio Resource Connection) signaling can be indicated once, and then the channel can be freely checked every time.
  • RRC Radio Resource Connection
  • the subframe number indicated by the RRC signaling is measured and fed back; or when downlink traffic arrives and downlink channel detection is performed on the unlicensed frequency band (LBT mechanism based on LBE (Load Based Equipment)), that is, channel detection time Non-periodic occurrence, and there is no channel busy time in this case, because if the channel is busy, channel detection is always performed, then only channel detection time and channel idle time, if the channel is detected to be idle, then the base station can only After each time the channel is detected to be idle, a CSI measurement is set according to the start time and the end time of the channel idle.
  • LBT mechanism based on LBE (Load Based Equipment)
  • the terminal CSI is informed of the time and frequency position; thus, it can be ensured How to inform the terminal of the CSI measurement time and frequency position under different LBT mechanisms and different channel states, so as to ensure the normal operation of CSI measurement and CSI feedback after the LTE system introduces the LBT mechanism in the unlicensed frequency band.
  • RRC Radio Resource Control
  • MAC Medium access control
  • DCI Downlink control indicator
  • the adjacent subframe after the channel detection time transmits CSI measurement configuration signaling and CSI feedback configuration signaling corresponding to the downlink channel busy state; or when the downlink channel is detected to be idle. Transmitting, by the terminal, a channel idle indication, so that after receiving the channel idle indication, the terminal performs, according to the received CSI measurement configuration signaling and CSI feedback configuration signaling corresponding to the downlink channel idle state. CSI measurements and the CSI feedback.
  • the base station may transmit a signal for measuring CSI in a neighboring subframe after the channel detection time, and the terminal may be adjacent to the subframe after the channel detection time.
  • the frame measures CSI and performs feedback (this method is applicable to the FBE-based LBT mechanism); or, when the base station performs downlink channel detection and detects that the downlink channel is idle, it immediately sends a channel idle indication to enable the terminal to receive the channel. After the idle indication, the CSI measurement is performed immediately. At this time, the base station can perform CSI after the terminal receives the channel idle indication.
  • the signal for the CSI measurement is transmitted, that is, after the terminal just receives the channel idle indication, the signal for performing the CSI measurement can also be transmitted (this method is applicable to the LBT mechanism based on FBE and LBE).
  • this method is applicable to the LBT mechanism based on FBE and LBE.
  • the CSI is measured and fed back to improve spectral efficiency and channel utilization.
  • the stored CSI information of the adjacent time fed back by the terminal is used as the current CSI information, or the lowest modulation coding mode is adopted, or RRM measurement result of the cell to which the base station belongs, RRM measurement result of other cells adjacent to the cell, and current CSI information determined by channel busy or switch state of the neighboring other cell; and the use of the stored
  • the CSI information of the adjacent time fed back by the terminal as the current CSI information specifically includes: when the CSI information of the adjacent time is the CSI information of the busy state of the channel, according to the CSI information of the adjacent time, and the adjacent time
  • the RSSI information at the time of channel detection corresponding to the CSI information and the RSSI information at the time of the current channel detection determine the current CSI information; or when the CSI information of the adjacent time is the CSI information of the downlink channel busy state, according to the The current CSI information is determined by the RSRP information of the cell to which the base station belongs and the RSSI information when the channel
  • the base station may obtain current CSI information (alternative CSI information) by using the following methods, including: using the neighboring time feedback of the terminal stored by the base station.
  • CSI information the most recent CSI information
  • RRM Radio Resource Management
  • a CSI measurement and feedback system for an LTE system operating in an unlicensed frequency band for a base station side, including: a control unit, configured to control and detect a current downlink channel when a downlink service arrives a state, and controlling to send CSI measurement configuration signaling and CSI feedback configuration signaling corresponding to the current downlink channel state to the terminal according to the current downlink channel state, or for transmitting, when a downlink service arrives, controlling to send to the terminal Determining the CSI measurement configuration signaling and the CSI feedback configuration signaling of the downlink channel state, so that the terminal performs CSI according to the CSI measurement configuration signaling and the CSI feedback configuration signaling corresponding to the downlink channel state after learning the downlink channel state. Measurement and CSI feedback.
  • the CSI measurement and the CSI feedback configuration signaling corresponding to the current downlink channel state are sent to the terminal, or when the downlink channel state is unknown, Transmitting CSI measurement and CSI feedback configuration signaling corresponding to the specified downlink channel state to the terminal, so that the terminal performs CSI measurement and CSI detection according to the corresponding CSI measurement and CSI feedback configuration signaling after learning the downlink channel state, so that The CSI measurement and the CSI feedback are normally performed after the LBT mechanism is introduced in the unlicensed frequency band to ensure the spectrum efficiency and the channel usage rate.
  • the specified downlink channel state includes the downlink channel busy state or the downlink channel idle state.
  • the method further includes: a setting unit, configured to send CSI measurement configuration signaling and CSI feedback configuration signaling corresponding to the current downlink channel state or a CSI measurement configuration corresponding to the specified downlink channel state.
  • a setting unit configured to send CSI measurement configuration signaling and CSI feedback configuration signaling corresponding to the current downlink channel state or a CSI measurement configuration corresponding to the specified downlink channel state.
  • the setting unit is specifically configured to: set corresponding to the The configuration content of the CSI measurement configuration signaling and the CSI feedback configuration signaling of the downlink channel busy state specifically includes: a first signal indicating the CSI measurement by the terminal, a first CSI measurement time and frequency position, and a first CSI measurement period.
  • the first CSI feedback time and the first CSI feedback period; and the configuration content of the CSI measurement configuration signaling and the CSI feedback configuration signaling corresponding to the downlink channel idle state specifically includes: the second indication that the terminal is used for CSI The measured signal, the second CSI measurement time and frequency position, the second CSI measurement period, the second CSI feedback time, and the second CSI feedback period.
  • CSI measurement configuration signaling and CSI feedback configuration signaling corresponding to the downlink channel state (downlink channel busy and downlink channel idle), and CSI measurement configuration signaling and CSI corresponding to the downlink channel busy state are set.
  • the configuration content of the feedback configuration signaling includes, but is not limited to, a first signal indicating the CSI measurement by the terminal (a signal for CSI measurement), a first CSI measurement time and a frequency position, a first CSI measurement period, and a first
  • the CSI measurement configuration time and the first CSI feedback period, the configuration content of the CSI measurement configuration signaling and the CSI feedback configuration signaling corresponding to the downlink channel idle state includes, but is not limited to: a second signal indicating that the terminal is used for CSI measurement (using The CSI measured time and frequency position, the second CSI measurement period, the second CSI feedback time, and the second CSI feedback period are corresponding to the CSI measurement and feedback signaling by configuring the downlink channel state and configuring Corresponding main content, to clearly indicate whether the CSI
  • the setting unit is further configured to: set the first signal indicating that the terminal is used for CSI measurement, including one or a combination of the following: PSS/SSS sent in a first cycle a signal, a CRS signal transmitted in a second period, a CSI-RS signal transmitted in a third period, and a DRS signal transmitted in a fourth period; setting the first CSI measurement time and frequency position as the first indication a transmission time and a frequency position of the signal used by the terminal for CSI measurement; setting the first CSI measurement period to be greater than or equal to a maximum of the first period, the second period, the third period, and the fourth period One cycle of setting the first CSI feedback period is greater than or equal to the first CSI measurement period; and setting the second signal indicating that the terminal is used for CSI measurement includes one or a combination of the following: Periodically sent a PSS/SSS signal, a CRS signal transmitted in a sixth cycle, a CSI-RS signal transmitted in a seventh cycle, and
  • the setting unit is further configured to: set configuration content of CSI measurement configuration signaling and CSI feedback configuration signaling corresponding to the downlink channel busy state and the downlink channel idle state.
  • the method includes: performing the CSI measurement and the CSI feedback aperiodically.
  • the signal indicating the CSI measurement by the first indication terminal corresponding to the busy state of the channel includes but is not limited to one or a combination of the following: the PSS transmitted in the first period (large period) is sent in the first period.
  • PSS/SSS Primary Synchronization Signal, Secondary Synchronization Signal
  • CRS Common Reference Signal
  • the second indication terminal corresponding to the state for the CSI measurement includes, but is not limited to, one of the following or a combination thereof: the PSS/SSS signal transmitted in the fifth period (small period), and the CRS transmitted in the sixth period (small period) a signal, a CSI-RS signal transmitted in a seventh cycle (small cycle), and a DRS signal transmitted in an eighth cycle (small cycle), wherein
  • the CSI feedback period corresponding to the downlink channel busy or downlink idle state is greater than the CSI measurement period, and the CSI measurement period is greater than or equal to the first period, a maximum one of the second period, the third period, and the fourth period and a maximum one of the fifth period, the sixth period, the seventh period, and the eighth period; and may detect an uplink channel idle or channel If the state is uncertain, CSI feedback is performed, that is, the CSI feedback time can be arbitrarily set; of course, the CSI measurement can also be performed non-periodically.
  • the CSI measurement and feedback can be performed based on which signals are explicitly determined, and the time and period of CSI measurement and feedback are clarified, thereby effectively ensuring that the LTE system is on the unlicensed band.
  • the CSI measurement and CSI feedback are performed normally after the introduction of the LBT mechanism.
  • control unit is specifically configured to: control, in the unlicensed frequency band or the licensed frequency band, to send CSI measurement configuration signaling corresponding to the downlink channel busy state and the downlink channel idle state. And CSI feedback configuration signaling and CSI feedback information.
  • CSI measurement configuration signaling and CSI feedback configuration signaling corresponding to different downlink channel states, and CSI information that needs feedback after the terminal performs CSI measurement may be sent on an unlicensed band or a licensed band, to Improve spectrum efficiency and channel utilization.
  • control unit is further configured to: when the channel detection is repeatedly performed in a fixed period on the unlicensed frequency band, control is directly sent to the terminal by means of RRC signaling. And performing CSI measurement configuration signaling and CSI feedback configuration signaling in the downlink channel busy state or the downlink channel idle state; or when receiving the downlink service, performing downlink channel detection on the unlicensed frequency band and
  • the control determines the CSI measurement time and the frequency position according to the start time and the end time of the downlink channel idle, and performs the manner by using RRC signaling, MAC signaling, or DCI signaling.
  • the terminal transmits CSI measurement configuration signaling and CSI feedback configuration signaling corresponding to the downlink channel idle state.
  • downlink channel detection (based on FBE (Framed based equipment) LBT mechanism) is repeated in a fixed period on an unlicensed frequency band, that is, channel detection time is periodically repeated, and CSI measurement is performed at this time.
  • the time and frequency position such as the subframe number, are relatively easy to indicate to the terminal, that is, the direct RRC (Radio Resource Connection) signaling can be indicated once, and then the channel can be freely checked every time.
  • RRC Radio Resource Connection
  • the subframe number indicated by the RRC signaling is measured and fed back; or when downlink traffic arrives and downlink channel detection is performed on the unlicensed frequency band (LBT mechanism based on LBE (Load Based Equipment)), that is, channel detection time Non-periodic occurrence, and there is no channel busy time in this case, because if the channel is busy, channel detection is always performed, then only channel detection time and channel idle time, if the channel is detected to be idle, then the base station can only After each time the channel is detected to be idle, a CSI measurement is set according to the start time and the end time of the channel idle.
  • LBT mechanism based on LBE (Load Based Equipment)
  • the time and frequency position are then used to inform the terminal CSI to measure the time and frequency position through RRC signaling, MAC (Medium access control) signaling or DCI (Downlink control indicator) signaling.
  • RRC Radio Resource Control
  • MAC Medium access control
  • DCI Downlink control indicator
  • control unit is further configured to: control, in a neighboring subframe after the channel detection time, to send CSI measurement configuration signaling and CSI feedback configuration signaling corresponding to the downlink channel busy state. Or when detecting that the downlink channel is idle, controlling to send a channel idle indication to the terminal, so that after receiving the channel idle indication, the terminal according to the received CSI measurement corresponding to the idle state of the downlink channel.
  • the configuration signaling and the CSI feedback configuration signaling perform the CSI measurement and the CSI feedback.
  • the base station may transmit a signal for measuring CSI in a neighboring subframe after the channel detection time, and the terminal may be adjacent to the subframe after the channel detection time.
  • the frame measures CSI and performs feedback (this method is applicable to the FBE-based LBT mechanism); or, when the base station performs downlink channel detection and detects that the downlink channel is idle, it immediately sends a channel idle indication to enable the terminal to receive the channel. After the idle indication, the CSI measurement is performed immediately. At this time, the base station can perform CSI after the terminal receives the channel idle indication.
  • the signal for the CSI measurement is transmitted, that is, after the terminal just receives the channel idle indication, the signal for performing the CSI measurement can also be transmitted (this method is applicable to the LBT mechanism based on FBE and LBE).
  • this method is applicable to the LBT mechanism based on FBE and LBE.
  • the CSI is measured and fed back to improve spectral efficiency and channel utilization.
  • control unit is further configured to: before receiving the CSI feedback, control CSI information of the adjacent time fed back by the stored terminal as the current CSI information, or control the lowest The modulation coding mode, or the control adopts the RRM measurement result according to the cell to which the base station belongs, the RRM measurement result of other cells adjacent to the cell, and the current state determined by the channel busy or switch state of the neighboring other cells.
  • the controlling, using the stored CSI information of the adjacent time fed back by the terminal as the current CSI information specifically includes: when the CSI information of the adjacent time is the CSI information of the busy state of the channel, the control is according to the The CSI information of the adjacent time, the RSSI information at the time of channel detection corresponding to the CSI information of the adjacent time, and the RSSI information at the time of the current channel detection determine the current CSI information; or when the CSI of the adjacent time
  • the information is the CSI information of the downlink channel busy state, according to the RSRP information of the cell to which the base station belongs and the RSSI when the channel is currently detected. The information determines the current CSI information.
  • the base station may obtain current CSI information (alternative CSI information) by using the following methods, including: using the neighboring time feedback of the terminal stored by the base station.
  • CSI information the most recent CSI information
  • RRM Radio Resource Management
  • the CSI information of the adjacent time fed back by the terminal stored by the base station is used as the current CSI.
  • a base station comprising a communication bus, an output device, a memory, and a processor, wherein:
  • the communication bus is configured to implement connection communication between the output device, the memory, and the processor
  • the output device is configured to send CSI measurement configuration signaling and CSI feedback configuration signaling corresponding to a current downlink channel state, and send CSI measurement configuration signaling and CSI feedback configuration signaling corresponding to a specified downlink channel state;
  • the memory stores a set of program codes, and the processor calls the program code stored in the memory to perform the following operations:
  • the CSI measurement configuration signaling and the CSI feedback configuration signaling corresponding to the specified downlink channel state are sent to the terminal by the output device, so that the terminal according to the downlink channel after learning the downlink channel state.
  • the CSI measurement configuration signaling and the CSI feedback configuration signaling corresponding to the state perform CSI measurement and CSI feedback.
  • the processor sends CSI measurement configuration signaling and CSI feedback configuration signaling corresponding to the current downlink channel state or CSI measurement configuration signaling and CSI corresponding to a specified downlink channel state.
  • feedback configuration signaling it is also used to perform the following operations:
  • CSI measurement configuration signaling and CSI feedback configuration signaling respectively corresponding to the downlink channel busy state and the downlink channel idle state are set.
  • the configuration content of the CSI measurement configuration signaling and the CSI feedback configuration signaling corresponding to the downlink channel busy state specifically includes: a first signal indicating that the terminal is used for CSI measurement, and the first CSI measurement time and frequency location, first CSI measurement period, first CSI feedback time, and first CSI feedback period;
  • the configuration content of the CSI measurement configuration signaling and the CSI feedback configuration signaling corresponding to the downlink channel idle state specifically includes: a second signal indicating the terminal for CSI measurement, a second CSI measurement time and frequency position, and a second CSI measurement period, second CSI feedback time, and second CSI feedback period.
  • the first signal indicating that the terminal is used for CSI measurement comprises one or a combination of the following: a PSS/SSS signal transmitted in a first cycle, and a CRS signal transmitted in a second cycle. a CSI-RS signal transmitted in a third cycle and a DRS signal transmitted in a fourth cycle;
  • the first CSI measurement time and frequency position is a transmission time and a frequency position of the first signal indicating that the terminal is used for CSI measurement;
  • the first CSI measurement period is greater than or equal to a maximum one of the first period, the second period, the third period, and the fourth period;
  • the first CSI feedback period is greater than or equal to the first CSI measurement period
  • the second signal indicating that the terminal is used for CSI measurement includes one or a combination of the following: a PSS/SSS signal transmitted in a fifth cycle, a CRS signal transmitted in a sixth cycle, and a CSI transmitted in a seventh cycle.
  • the second CSI measurement time and frequency location is provided by the second CSI measurement configuration signaling, indicating a subframe number and a subcarrier position used by the terminal for CSI measurement;
  • the second CSI measurement period is greater than or equal to a maximum one of the fifth period, the sixth period, the seventh period, and the eighth period;
  • the second CSI feedback period is greater than or equal to the second CSI measurement period, where the fifth period is less than or equal to the first period, the sixth period is less than or equal to the second period, The seventh period is less than or equal to the third period, the eighth period is less than or equal to the fourth period, and the second CSI measurement period is less than or equal to the first CSI measurement period, the second CSI feedback The period is less than or equal to the first CSI feedback period, and
  • the first CSI feedback time and the second CSI feedback time include: feedback when an uplink channel is detected to be idle, or direct feedback after the CSI measurement ends.
  • the configuration content of the CSI measurement configuration signaling and the CSI feedback configuration signaling corresponding to the downlink channel busy state and the downlink channel idle state specifically includes: performing the CSI measurement aperiodically. And the CSI feedback.
  • the processor is further configured to:
  • the processor is further configured to:
  • the CSI measurement configuration information corresponding to the downlink channel busy state or the downlink channel idle state is directly sent to the terminal by means of RRC signaling.
  • RRC signaling For CSI feedback configuration signaling; or
  • the processor is further configured to:
  • the processor is further configured to:
  • the stored CSI information of the adjacent time fed back by the terminal is used as the current CSI information, or the lowest modulation coding mode is adopted, or the RRM measurement result according to the cell to which the base station belongs is adopted, Other cells adjacent to the cell RRM measurement results and current CSI information determined by channel busy or switch state of the neighboring other cells;
  • the CSI information of the adjacent time fed back by the terminal as the current CSI information specifically includes:
  • the CSI information of the adjacent time is the CSI information of the busy state of the channel
  • the CSI information of the adjacent time the RSSI information of the channel detection corresponding to the CSI information of the adjacent time, and the current channel
  • the RSSI information at the time of detection determines the current CSI information
  • the current CSI information is determined according to the RSRP information of the cell to which the base station belongs and the RSSI information when the channel is currently detected.
  • the CSI measurement and feedback system when the base station works in the unlicensed frequency band by the LTE system, when there is downlink service arrival, and when the downlink channel state is known, the CSI measurement corresponding to the current downlink channel state is The CSI feedback configuration signaling is sent to the terminal, or, when the downlink channel state is unknown, the CSI measurement and the CSI feedback configuration signaling corresponding to the specified downlink channel state are sent to the terminal, so that the terminal obtains the downlink channel state according to the corresponding The CSI measurement and the CSI feedback configuration signaling perform CSI measurement and CSI detection.
  • the CSI measurement and the CSI feedback can be effectively performed after the LBT mechanism is introduced in the unlicensed band of the LTE system, and the latest CSI information is not yet ensured.
  • the CSI information can be obtained, so that the base station can select a more suitable modulation and coding mode, and further improve the spectrum efficiency and channel usage.
  • the technical solution of the present invention can ensure that the CSI measurement and the CSI feedback are performed normally after the LBT mechanism is introduced in the unlicensed frequency band of the LTE system, and that the CSI information can be obtained when the latest CSI information is not obtained, thereby enabling
  • the base station can select a more suitable modulation and coding scheme to further improve spectral efficiency and channel utilization.
  • Figure 1 shows a schematic diagram of two modes of operation of an unlicensed spectrum
  • FIG. 2 is a schematic diagram showing an interference avoidance rule of a Wi-Fi system
  • FIG. 3 is a schematic diagram showing an LBT frame structure in LTE
  • FIG. 4 is a flow chart showing a CSI measurement and feedback method when an LTE system operates in an unlicensed band according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of CSI measurement under a frame structure based LBT mechanism when an LTE system operates in an unlicensed frequency band according to an embodiment of the present invention
  • FIG. 6 is a schematic diagram of CSI measurement under a load (data service) based LBT mechanism when an LTE system operates in an unlicensed band according to an embodiment of the present invention
  • FIG. 7 is a schematic diagram showing a delay of measuring CSI by channel busy and idle according to an embodiment of the present invention.
  • FIG. 8 is a schematic diagram showing a time delay of measuring CSI when a channel is idle according to an embodiment of the present invention.
  • FIG. 9 is a block diagram showing the structure of a CSI measurement and feedback system when an LTE system operates in an unlicensed band according to an embodiment of the present invention.
  • FIG. 10 is a schematic structural diagram of a base station according to an embodiment of the present invention.
  • FIG. 11 shows a schematic structural diagram of another base station according to an embodiment of the present invention.
  • FIG. 4 is a flow chart showing a CSI measurement and feedback method when an LTE system operates in an unlicensed band according to an embodiment of the present invention.
  • a CSI measurement and feedback method for an LTE system operating in an unlicensed band is used by a base station side, and includes: Step 402: When a downlink service arrives, detecting a current downlink channel state. And transmitting CSI measurement configuration signaling and CSI feedback configuration signaling corresponding to the current downlink channel state to the terminal according to the current downlink channel state; or transmitting, when a downlink service arrives, corresponding to the specified downlink channel state to the terminal CSI measurement configuration signaling and CSI feedback configuration signaling, so that the terminal is informed of the downlink channel state according to the next
  • the CSI measurement configuration signaling and the CSI feedback configuration signaling corresponding to the channel channel state perform CSI measurement and CSI feedback.
  • the CSI measurement and the CSI feedback configuration signaling corresponding to the current downlink channel state are sent to the terminal, or when the downlink channel state is unknown, Transmitting CSI measurement and CSI feedback configuration signaling corresponding to the specified downlink channel state to the terminal, so that the terminal performs CSI measurement and CSI detection according to the corresponding CSI measurement and CSI feedback configuration signaling after learning the downlink channel state, so that The CSI measurement and the CSI feedback are normally performed after the LBT mechanism is introduced in the unlicensed frequency band to ensure the spectrum efficiency and the channel usage rate.
  • the specified downlink channel state includes the downlink channel busy state or the downlink channel idle state.
  • CSI measurement configuration signaling and CSI feedback configuration signaling corresponding to the current downlink channel state or CSI measurement configuration signaling and CSI feedback configuration signaling corresponding to a specified downlink channel state are transmitted.
  • the method further includes: setting CSI measurement configuration signaling and CSI feedback configuration signaling respectively corresponding to the downlink channel busy state and the downlink channel idle state.
  • the configuration content of the CSI measurement configuration signaling and the CSI feedback configuration signaling corresponding to the downlink channel busy state specifically includes: a first signal indicating that the terminal is used for CSI measurement, and the first CSI measurement time and frequency position, first CSI measurement period, first CSI feedback time, and first CSI feedback period; and configuration content of CSI measurement configuration signaling and CSI feedback configuration signaling corresponding to the downlink channel idle state
  • the method includes: a second signal indicating the CSI measurement by the terminal, a second CSI measurement time and frequency position, a second CSI measurement period, a second CSI feedback time, and a second CSI feedback period.
  • CSI measurement configuration signaling and CSI feedback configuration signaling corresponding to the downlink channel state (downlink channel busy and downlink channel idle), and CSI measurement configuration signaling and CSI feedback corresponding to the channel busy state are set.
  • the configuration content of the configuration signaling includes, but is not limited to, a first signal indicating the CSI measurement by the terminal (a signal for CSI measurement), a first CSI measurement time and a frequency position, a first CSI measurement period, and a first CSI.
  • the configuration of the CSI measurement configuration signaling and the CSI feedback configuration signaling corresponding to the downlink channel idle state includes, but is not limited to: a second signal indicating that the terminal is used for CSI measurement (for the feedback time and the first CSI feedback period) CSI measured signal), second CSI measurement time and frequency position, second CSI
  • the measurement period, the second CSI feedback time, and the second CSI feedback period are corresponding to the CSI measurement and the feedback signaling, and the corresponding main content is configured to explicitly indicate whether the measurement is needed when the downlink channel state is different.
  • feedback CSI and based on which information is used for CSI measurement and feedback, thereby effectively ensuring the normal operation of CSI measurement and CSI feedback after the LTE system introduces the LBT mechanism in the unlicensed frequency band.
  • the first signal indicating that the terminal is used for CSI measurement comprises one or a combination of the following: a PSS/SSS signal transmitted in a first cycle, and a CRS signal transmitted in a second cycle. a CSI-RS signal transmitted in a third period and a DRS signal transmitted in a fourth period; the first CSI measurement time and frequency position being a first transmission time of the signal indicating that the terminal is used for CSI measurement a frequency position; the first CSI measurement period is greater than or equal to a maximum one of the first period, the second period, the third period, and the fourth period; the first CSI feedback period is greater than Or equal to the first CSI measurement period; and the second signal indicating that the terminal is used for CSI measurement includes one or a combination of the following: a PSS/SSS signal sent in a fifth cycle, sent in a sixth cycle a CRS signal, a CSI-RS signal transmitted in a seventh period, and a DRS signal transmitted in an eighth period; the second signal indicating that the terminal is used for
  • the configuration content of the CSI measurement configuration signaling and the CSI feedback configuration signaling corresponding to the downlink channel busy state and the downlink channel idle state specifically includes: performing the CSI measurement aperiodically. And the CSI feedback.
  • the first indication terminal corresponding to the downlink channel busy state is used for CSI
  • the measured signal includes, but is not limited to, one or a combination of the following: a PSS/SSS (Primary Synchronization Signal, Primary Synchronization Signal, Secondary Synchronization Signal) transmitted by the PSS transmitted in the first period (large period) according to the first period.
  • PSS/SSS Primary Synchronization Signal, Primary Synchronization Signal, Secondary Synchronization Signal
  • the DRS (Discover Reference Signal) signal transmitted in the fourth period and the second indication terminal corresponding to the downlink channel idle state are used for CSI measurement, including but not limited to one or a combination of the following:
  • the terminal performs CSI measurement and CSI feedback; and the start time of the CSI measurement and feedback corresponding to the downlink channel busy state and the downlink channel idle state (the first CSI measurement time and frequency position and the second CSI measurement time and frequency position) are indicating terminals respectively
  • the transmission time of the signal used for CSI measurement and the subframe number and subcarrier position for CSI measurement given in the signaling; the CSI feedback period corresponding to the busy or idle state of the downlink channel is greater than the CSI measurement period, and the CSI measurement period is respectively And greater than or equal to a maximum one of the first period, the second period, the third period, and the fourth period, and a maximum one of the fifth period, the sixth period, the seventh period, and the eighth period; and CSI feedback can be performed when the uplink channel is idle or the channel state is uncertain.
  • the CSI feedback time can be set arbitrarily. CSI measurement and CSI feedback are performed aperiodically. When the downlink channel state is known or unknown, CSI measurement and feedback can be performed based on which signals are explicitly determined, and the time and period of CSI measurement and feedback are clarified, thereby effectively Ensure that the CSI measurement and CSI feedback are performed normally after the LTE system introduces the LBT mechanism on the unlicensed band.
  • CSI measurement configuration signaling, CSI feedback configuration signaling, and CSI feedback corresponding to the downlink channel busy state and the downlink channel idle state are sent on the unlicensed band or the licensed band. information.
  • CSI measurement configuration signaling and CSI feedback configuration signaling corresponding to different downlink channel states, and CSI information that needs feedback after the terminal performs CSI measurement may be sent on an unlicensed band or a licensed band, to Improve spectrum efficiency and channel utilization.
  • FIG. 5 is a schematic diagram of CSI measurement under a frame structure based LBT mechanism when an LTE system operates in an unlicensed band according to an embodiment of the present invention.
  • FIG. 6 is a diagram showing a frame structure in which channel detection time is repeatedly set in a fixed detection period according to an embodiment of the present invention.
  • CSI measurement configuration signaling and CSI feedback configuration signaling in idle state preferably, when the channel detection is repeatedly performed on the unlicensed frequency band in a fixed period, the downlink channel busy state or the The CSI measurement configuration signaling and the CSI feedback configuration signaling of the downlink channel idle state; or when the downlink service is received, and downlink channel detection is performed on the unlicensed frequency band, and when the downlink channel is idle, Determining, according to the start time and the end time of the downlink channel idle, the
  • the idle can be measured and fed back according to the subframe number indicated by the RRC signaling; or when downlink traffic arrives, and downlink channel detection is performed on the unlicensed frequency band (LBT mechanism based on LBE (Load based equipment) ), that is, the channel detection time occurs non-periodically, as shown in Figure 6, and there is no channel busy time in this case, because if the channel is busy, channel detection is always performed, then only channel detection time and channel idle time, if When the channel is detected to be idle, at this time, the base station can only follow the start time of the channel idle after each time the channel is detected to be idle.
  • LBT mechanism based on LBE Load based equipment
  • the end time is set to a CSI measurement time and frequency position, and then the terminal CSI measurement time and the terminal are notified by RRC signaling, MAC (Medium access control) signaling or DCI (Downlink control indicator) signaling.
  • RRC Radio Resource Control
  • MAC Medium access control
  • DCI Downlink control indicator
  • FIG. 7 is a timing diagram showing the measurement of CSI by channel busy and idle according to an embodiment of the present invention.
  • FIG. 8 is a diagram showing a delay of measuring CSI when a channel is idle according to an embodiment of the present invention.
  • the adjacent subframe after the channel detection time transmits CSI measurement configuration signaling and CSI feedback configuration signaling corresponding to the downlink channel busy state; or when the downlink channel is detected to be idle. Transmitting, by the terminal, a channel idle indication, so that after receiving the channel idle indication, the terminal performs, according to the received CSI measurement configuration signaling and CSI feedback configuration signaling corresponding to the downlink channel idle state. CSI measurements and the CSI feedback.
  • the base station may transmit a signal for measuring CSI in a neighboring subframe after the channel detection time, and the terminal may be adjacent to the subframe after the channel detection time.
  • the frame measures CSI and performs feedback (this method is applicable to the FBE-based LBT mechanism); or, when the base station performs downlink channel detection and detects that the downlink channel is idle, it immediately sends a channel idle indication to enable the terminal to receive the channel. After the idle indication, the CSI measurement is performed immediately. At this time, the base station sends a signal for CSI measurement after the terminal receives the channel idle indication and the time required for the CSI measurement, that is, after the terminal just receives the channel idle indication.
  • the signal when the CSI measurement is performed can also be transmitted (this method is applicable to the LBT mechanism based on FBE and LBE); thus, it is possible to transmit a signal indicating the terminal for CSI measurement in a suitable subframe to effectively reduce
  • the base station detects that the channel is idle and the terminal measures and reports the delay of the CSI, the terminal can measure and feed back the CSI as early as possible. Improve spectral efficiency and channel usage, as shown in Figures 7 and 8.
  • the stored CSI information of the adjacent time fed back by the terminal is used as the current CSI information, or the lowest modulation coding mode is adopted, or RRM measurement result of the cell to which the base station belongs, RRM measurement result of other cells adjacent to the cell, and current CSI information determined by channel busy or switch state of the neighboring other cell; and the use of the stored
  • the CSI information of the adjacent time fed back by the terminal as the current CSI information specifically includes: when the CSI information of the adjacent time is the CSI information of the busy state of the channel, according to the CSI information of the adjacent time, The RSSI information at the time of channel detection corresponding to the CSI information of the adjacent time and the RSSI information at the time of the current channel detection determine the current CSI information; or when the CSI information of the adjacent time is a busy state of the downlink channel
  • the current CSI information is determined according to the RSRP information of the cell to which the base station belongs and the RSSI information when the
  • the base station may obtain current CSI information (alternative CSI information) by using the following methods, including: using the neighboring time feedback of the terminal stored by the base station.
  • CSI information the most recent CSI information
  • RRM Radio Resource Management
  • the CSI information of the adjacent time fed back by the terminal stored by the base station as the current CSI information specifically includes: if the latest interval time is short, and is also the CSI information of the downlink channel idle state; if the latest interval time is short, Moreover, the CSI information of the downlink channel busy state is combined with the current channel according to the adjacent CSI information (old CSI information) and the RSSI (Received Signal Strength indication) information corresponding to the channel detection.
  • RSSI information at the time of detection new RSSI information
  • the RSSI information at the time of channel detection may be that the terminal quantizes the detected RSSI to a value when the channel is detected to be idle, and the value is notified to the base station terminal.
  • RSSI the current CSI information
  • FIG. 9 is a block diagram showing the structure of a CSI measurement and feedback system when an LTE system operates in an unlicensed band according to an embodiment of the present invention.
  • a CSI measurement and feedback system 900 for an LTE system operating in an unlicensed band is used for a base station side, and includes: a control unit 902, configured to control when a downlink service arrives Detecting a current downlink channel state, and controlling to send CSI measurement configuration signaling and CSI feedback configuration signaling corresponding to the current downlink channel state to the terminal according to the current downlink channel state, or for controlling when a downlink service arrives Transmitting CSI measurement configuration signaling and CSI feedback configuration signaling corresponding to the specified downlink channel state to the terminal, so that the terminal, after learning the downlink channel state, configures signaling and CSI feedback configuration according to the CSI measurement corresponding to the downlink channel state. Signaling performs CSI measurement and CSI feedback.
  • the CSI measurement and the CSI feedback configuration signaling corresponding to the current downlink channel state are sent to the terminal, or when the downlink channel state is unknown, Transmitting CSI measurement and CSI feedback configuration signaling corresponding to the specified downlink channel state to the terminal, so that the terminal performs CSI measurement and CSI detection according to the corresponding CSI measurement and CSI feedback configuration signaling after learning the downlink channel state, so that The CSI measurement and the CSI feedback are normally performed after the LBT mechanism is introduced in the unlicensed frequency band to ensure the spectrum efficiency and the channel usage rate.
  • the specified downlink channel state includes the downlink channel busy state or the downlink channel idle state.
  • the method further includes: a setting unit 904, configured to send CSI measurement configuration signaling and CSI feedback configuration signaling corresponding to the current downlink channel state or CSI measurement corresponding to a specified downlink channel state.
  • a setting unit 904 configured to send CSI measurement configuration signaling and CSI feedback configuration signaling corresponding to the current downlink channel state or CSI measurement corresponding to a specified downlink channel state.
  • the setting unit 904 is specifically configured to: set the configuration content of the CSI measurement configuration signaling and the CSI feedback configuration signaling corresponding to the downlink channel busy state, where the first indication includes: a signal used by the terminal for CSI measurement, a first CSI measurement time and frequency position, a first CSI measurement period, a first CSI feedback time, and a first CSI feedback period; and setting a CSI measurement configuration letter corresponding to the downlink channel idle state
  • the configuration content of the CSI feedback configuration signaling specifically includes: a second signal indicating the terminal for CSI measurement, a second CSI measurement time and frequency position, a second CSI measurement period, a second CSI feedback time, and a second CSI Feedback cycle.
  • CSI measurement configuration signaling and CSI feedback configuration signaling corresponding to the downlink channel state (downlink channel busy and downlink channel idle), and CSI measurement configuration signaling and CSI corresponding to the downlink channel busy state are set.
  • the configuration content of the feedback configuration signaling includes, but is not limited to, a first signal indicating the CSI measurement by the terminal (a signal for CSI measurement), a first CSI measurement time and a frequency position, a first CSI measurement period, and a first
  • the CSI measurement configuration time and the first CSI feedback period, the configuration content of the CSI measurement configuration signaling and the CSI feedback configuration signaling corresponding to the downlink channel idle state includes, but is not limited to: a second signal indicating that the terminal is used for CSI measurement (using The CSI measured time and frequency position, the second CSI measurement period, the second CSI feedback time, and the second CSI feedback period are corresponding to the CSI measurement and feedback signaling by configuring the downlink channel state and configuring Corresponding main content, to clearly indicate whether the CSI
  • the setting unit 904 is further configured to: set the first signal indicating that the terminal is used for CSI measurement, including one or a combination of the following: a PSS sent in a first cycle.
  • the signal measured at the CSI includes one or a combination of the following: a PSS/SSS signal transmitted in a fifth cycle, a CRS signal transmitted in a sixth cycle, a
  • the second CSI feedback time includes: feedback when an uplink channel is detected to be idle, or direct feedback after the CSI measurement ends.
  • the setting unit 904 is further configured to: set configuration content of CSI measurement configuration signaling and CSI feedback configuration signaling corresponding to the downlink channel busy state and the downlink channel idle state. Specifically, the CSI measurement and the CSI feedback are performed aperiodically.
  • the signal indicating the CSI measurement by the first indication terminal corresponding to the downlink channel busy state includes but is not limited to one or a combination of the following: the PSS transmitted in the first period (large period) is sent in the first cycle.
  • the signal indicating the CSI measurement by the second indication terminal corresponding to the idle state includes but is not limited to one or a combination of the following: the PSS/SSS signal transmitted in the fifth period (small period), according to the sixth period (small period)
  • the period value and the largest one of the fifth period, the sixth period, the seventh period, and the eighth period; and the CSI feedback can be performed when the uplink channel is idle or the channel state is uncertain, that is, the CSI can be arbitrarily set. Feedback time; of course, CSI measurement and CSI feedback can also be performed non-periodically. When the channel state is known or unknown, CSI measurement and feedback can be performed based on which signals are explicitly determined, and the time of CSI measurement and feedback is clarified. And the period, which effectively ensures the normal operation of CSI measurement and CSI feedback after the LTE system introduces the LBT mechanism in the unlicensed band.
  • control unit 902 is specifically configured to: control, in the unlicensed frequency band or the licensed frequency band, to send a CSI measurement configuration information corresponding to the downlink channel busy state and the downlink channel idle state.
  • the command and CSI feedback configuration signaling and CSI feedback information are specifically configured to: control, in the unlicensed frequency band or the licensed frequency band, to send a CSI measurement configuration information corresponding to the downlink channel busy state and the downlink channel idle state.
  • CSI measurement configuration signaling and CSI feedback configuration signaling corresponding to different downlink channel states, and CSI information that needs feedback after the terminal performs CSI measurement may be sent on an unlicensed band or a licensed band, to Improve spectrum efficiency and channel utilization.
  • control unit 902 is further configured to: when the channel detection is repeatedly performed in a fixed period on the unlicensed frequency band, control is directly sent to the terminal by means of RRC signaling.
  • control is directly sent to the terminal by means of RRC signaling.
  • the control determines the CSI measurement time and the frequency position according to the start time and the end time of the downlink channel idle, and sends the corresponding to the terminal by means of RRC signaling, MAC signaling, and/or DCI signaling.
  • downlink channel detection (based on FBE (Framed based equipment) LBT mechanism) is repeated in a fixed period on an unlicensed frequency band, that is, channel detection time is periodically repeated, and CSI measurement is performed at this time.
  • the time and frequency position such as the subframe number, are relatively easy to indicate to the terminal, that is, the direct RRC (Radio Resource Connection) signaling can be indicated once, and then the channel can be freely checked every time.
  • RRC Radio Resource Connection
  • the subframe number indicated by the RRC signaling is measured and fed back; or when downlink traffic arrives and downlink channel detection is performed on the unlicensed frequency band (LBT mechanism based on LBE (Load Based Equipment)), that is, channel detection time Non-periodic occurrence, and there is no channel busy time in this case, because if the channel is busy, channel detection is always performed, then only channel detection time and channel idle time, if the channel is detected to be idle, then the base station can only After each time the channel is detected to be idle, a CSI measurement is set according to the start time and the end time of the channel idle.
  • LBT mechanism based on LBE (Load Based Equipment)
  • the time and frequency position are then used to inform the terminal CSI to measure the time and frequency position through RRC signaling, MAC (Medium access control) signaling or DCI (Downlink control indicator) signaling.
  • RRC Radio Resource Control
  • MAC Medium access control
  • DCI Downlink control indicator
  • control unit 902 is further configured to: control, in a neighboring subframe after the channel detection time, to send CSI measurement configuration signaling and a CSI feedback configuration signal corresponding to the downlink channel busy state. Or when the downlink channel is idle, the control sends a channel idle indication to the terminal, so that the terminal receives the channel idle indication according to the received CSI corresponding to the downlink channel idle state.
  • the measurement configuration signaling, the CSI feedback configuration signaling, the CSI measurement, and the CSI feedback is further configured to: control, in a neighboring subframe after the channel detection time, to send CSI measurement configuration signaling and a CSI feedback configuration signal corresponding to the downlink channel busy state.
  • the base station may send a signal for measuring CSI in a neighboring subframe after the channel detection time, and the terminal may be in the letter.
  • the adjacent subframes measure CSI and perform feedback after the channel detection time (this method is applicable to the FBE-based LBT mechanism); or, when the base station performs downlink channel detection and detects that the downlink channel is idle, immediately transmits a channel idle indication. So that the terminal performs CSI measurement immediately after receiving the channel idle indication.
  • the base station sends a signal for CSI measurement after the terminal receives the channel idle indication and the time required for the CSI measurement, that is, After the terminal just receives the channel idle indication, the signal when the CSI measurement is performed can also be sent (this method is applicable to the LBT mechanism based on FBE and LBE); thus, it can be implemented to transmit the indication terminal for CSI in a suitable subframe.
  • the measured signal is used to effectively reduce the delay time after the base station detects the channel idle and the terminal measures and feeds back the CSI, so that the terminal can measure and feed back CSI as early as possible, thereby improving spectrum efficiency and channel utilization.
  • control unit 902 is further configured to: before receiving the CSI feedback, control, by using the stored CSI information of the adjacent time fed back by the terminal as current CSI information, or control adopting The lowest modulation coding mode, or the control is determined according to the RRM measurement result of the cell to which the base station belongs, the RRM measurement result of other cells adjacent to the cell, and the channel busy or switch state of the neighboring other cells.
  • the current CSI information; and the control uses the stored CSI information of the adjacent time fed back by the terminal as the current CSI information, specifically: when the CSI information of the adjacent time is the CSI information of the busy state of the channel, The CSI information of the adjacent time, the RSSI information at the time of channel detection corresponding to the CSI information of the adjacent time, and the RSSI information at the time of the current channel detection determine the current CSI information; or when the adjacent time
  • the CSI information is the CSI information of the downlink channel busy state, according to the RSRP information of the cell to which the base station belongs and the R when the current channel is detected.
  • the SSI information determines the current CSI information.
  • the base station may obtain current CSI information (alternative CSI information) by using the following methods, including: using the neighboring time feedback of the terminal stored by the base station.
  • CSI information the most recent CSI information
  • RRM Radio Resource Management
  • the CSI information of the adjacent time fed back by the terminal stored by the base station as the current CSI information specifically includes: if the latest interval time is short, and is also the CSI information of the downlink channel idle state; if the latest interval time is short, Moreover, the CSI information of the downlink channel busy state is combined with the current channel according to the adjacent CSI information (old CSI information) and the RSSI (Received Signal Strength indication) information corresponding to the channel detection.
  • RSSI information at the time of detection new RSSI information
  • the RSSI information at the time of channel detection may be that the terminal quantizes the detected RSSI to a value when the channel is detected to be idle, and the value is notified to the base station terminal.
  • RSSI the current CSI information
  • FIG. 10 shows a schematic structural diagram of a base station according to an embodiment of the present invention.
  • a base station 1000 includes: a CSI measurement and feedback system 900 when an LTE system according to any one of the above technical solutions operates in an unlicensed frequency band.
  • the CSI measurement and feedback system 900 when the base station 1000 operates in the unlicensed frequency band by the LTE system, when there is downlink service arrival, and when the downlink channel state is known, the CSI corresponding to the current downlink channel state is used.
  • the measurement and the CSI feedback configuration signaling are sent to the terminal, or, when the downlink channel state is unknown, the CSI measurement and the CSI feedback configuration signaling corresponding to the specified downlink channel state are sent to the terminal, so that the terminal obtains the downlink channel state according to the Corresponding CSI measurement and CSI feedback configuration signaling are used for CSI measurement and CSI detection.
  • the CSI measurement and CSI feedback can be effectively performed after the LTE system introduces the LBT mechanism in the unlicensed frequency band, and the latest CSI information is ensured.
  • Alternate CSI information can be obtained when not obtained, so that the base station can select a more suitable modulation and coding mode, further improving spectral efficiency and channel utilization.
  • FIG. 11 is a schematic structural diagram of another base station according to an embodiment of the present invention.
  • the base station may include: at least one output device 1103, at least one processor 1101, For example, the CPU, the memory 1104, and the at least one bus 1102, the processor 1101 can be combined with the CSI measurement and feedback system when the LTE system shown in FIG. 9 operates in an unlicensed band.
  • the bus 1102 is used to connect the output device 1103, the processor 1101, and the memory 1104.
  • the output device 1103 may specifically be a communication interface of the terminal, such as a network interface, and the network interface may include a standard wired interface or a wireless interface (such as a WI-FI interface), specifically for transmitting CSI measurement corresponding to the current downlink channel state.
  • the signaling and CSI feedback configuration signaling are configured to transmit CSI measurement configuration signaling and CSI feedback configuration signaling corresponding to the specified downlink channel state.
  • the above memory 1104 may be a high speed RAM memory or a non-volatile memory such as a disk memory.
  • the above memory 1104 is further configured to store a set of program codes, and the processor 1101 is configured to call the program code stored in the memory 1104 to perform the following operations:
  • the current downlink channel state is detected, and CSI measurement configuration signaling and CSI feedback configuration signaling corresponding to the current downlink channel state are sent to the terminal by using the output device according to the current downlink channel state.
  • the CSI measurement configuration signaling and the CSI feedback configuration signaling corresponding to the specified downlink channel state are sent to the terminal by the output device 1103, so that the terminal is in the After learning the downlink channel state, CSI measurement and CSI feedback are performed according to CSI measurement configuration signaling and CSI feedback configuration signaling corresponding to the downlink channel state.
  • the processor 1101 transmits CSI measurement configuration signaling and CSI feedback configuration signaling corresponding to the current downlink channel state or CSI measurement configuration signaling and CSI feedback corresponding to a specified downlink channel state. Before configuring signaling, it is also used to do the following:
  • CSI measurement configuration signaling and CSI feedback configuration signaling respectively corresponding to the downlink channel busy state and the downlink channel idle state are set.
  • the configuration content of the CSI measurement configuration signaling and the CSI feedback configuration signaling corresponding to the downlink channel busy state specifically includes: a first signal indicating that the terminal is used for CSI measurement, and a first CSI measurement. Time and frequency location, first CSI measurement period, first CSI feedback time, and first CSI feedback period. as well as
  • the configuration content of the CSI measurement configuration signaling and the CSI feedback configuration signaling corresponding to the downlink channel idle state specifically includes: a second signal indicating the terminal for CSI measurement, a second CSI measurement time and frequency position, and a second CSI measurement period, second CSI feedback time, and second CSI feedback period.
  • the first signal indicating that the terminal is used for CSI measurement includes one or a combination of the following: a PSS/SSS signal sent in a first cycle, a CRS signal sent in a second cycle, The CSI-RS signal transmitted in the third period and the DRS signal transmitted in the fourth period.
  • the first CSI measurement time and frequency position is a transmission time and a frequency position of the first signal indicating that the terminal is used for CSI measurement.
  • the first CSI measurement period is greater than or equal to a maximum one of the first period, the second period, the third period, and the fourth period.
  • the first CSI feedback period is greater than or equal to the first CSI measurement period.
  • the second signal indicating that the terminal is used for CSI measurement includes one or a combination of the following: a PSS/SSS signal transmitted in a fifth cycle, a CRS signal transmitted in a sixth cycle, and a CSI transmitted in a seventh cycle.
  • the RS signal and the DRS signal transmitted in the eighth cycle includes one or a combination of the following: a PSS/SSS signal transmitted in a fifth cycle, a CRS signal transmitted in a sixth cycle, and a CSI transmitted in a seventh cycle.
  • the RS signal and the DRS signal transmitted in the eighth cycle.
  • the second CSI measurement time and frequency location is provided by the second CSI measurement configuration signaling, indicating a subframe number and a subcarrier location used by the terminal for CSI measurement.
  • the second CSI measurement period is greater than or equal to the fifth period, the sixth period, and the The largest one of the seventh period and the eighth period.
  • the second CSI feedback period is greater than or equal to the second CSI measurement period, where the fifth period is less than or equal to the first period, the sixth period is less than or equal to the second period, The seventh period is less than or equal to the third period, the eighth period is less than or equal to the fourth period, and the second CSI measurement period is less than or equal to the first CSI measurement period, the second CSI feedback The period is less than or equal to the first CSI feedback period.
  • the first CSI feedback time and the second CSI feedback time include: feedback when an uplink channel is detected to be idle, or direct feedback after the CSI measurement ends.
  • the configuration content of the CSI measurement configuration signaling and the CSI feedback configuration signaling corresponding to the downlink channel busy state and the downlink channel idle state specifically includes: performing the CSI measurement and the aperiodically CSI feedback.
  • processor 1101 is further configured to perform the following operations:
  • processor 1101 is further configured to perform the following operations:
  • the CSI measurement configuration information corresponding to the downlink channel busy state or the downlink channel idle state is directly sent to the terminal by means of RRC signaling.
  • RRC signaling Let the CSI feedback configuration signaling. or
  • processor 1101 is further configured to perform the following operations:
  • the CSI measurement configuration signaling and the CSI feedback configuration signaling of the state perform the CSI measurement and the CSI feedback.
  • processor 1101 is further configured to perform the following operations:
  • the stored CSI information of the adjacent time fed back by the terminal is used as the current CSI information, or the lowest modulation coding mode is adopted, or the RRM measurement result according to the cell to which the base station belongs is adopted, RRM measurement results of other cells adjacent to the cell and current CSI information determined by channel busy or switch state of the neighboring other cells. as well as
  • the CSI information of the adjacent time fed back by the terminal as the current CSI information specifically includes:
  • the CSI information of the adjacent time is the CSI information of the busy state of the channel
  • the CSI information of the adjacent time the RSSI information of the channel detection corresponding to the CSI information of the adjacent time, and the current channel
  • the RSSI information at the time of detection determines the current CSI information.
  • the current CSI information is determined according to the RSRP information of the cell to which the base station belongs and the RSSI information when the channel is currently detected.
  • terminal introduced in the embodiment of the present invention may be used to implement some or all of the processes in the method embodiment introduced by the present invention in conjunction with FIG.
  • the technical solution of the present invention is described in detail with reference to the accompanying drawings, which can ensure the normal implementation of CSI measurement and CSI feedback after the introduction of the LBT mechanism in the unlicensed frequency band of the LTE system, and ensure that the replacement can be obtained when the latest CSI information is not obtained.
  • the CSI information enables the base station to select a more suitable modulation and coding scheme to further improve spectral efficiency and channel utilization.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé et un système de mesure et de rétroaction de CSI ainsi qu'une station de base lorsque un système LTE fonctionne dans un spectre non autorisé. Le procédé consiste à : lors de l'arrivée d'un service de liaison descendante, détecter un état de canal de liaison descendante courant, et envoyer une signalisation de configuration de mesure de CSI et une signalisation de configuration de rétroaction de CSI, qui correspondent à l'état de canal de liaison descendante courant, à un terminal conformément à l'état de canal de liaison descendante courant ; ou, lors de l'arrivée d'un service de liaison descendante, envoyer une signalisation de configuration de mesure de CSI et une signalisation de configuration de rétroaction de CSI, qui correspondent à un état de canal de liaison descendante spécifié, à un terminal, de sorte que, dès que le terminal connaît l'état de canal de liaison descendante, le terminal effectue une mesure de CSI et une rétroaction de CSI conformément à la signalisation de configuration de mesure de CSI et à la signalisation de configuration de rétroaction de CSI qui correspondent à l'état de canal de liaison descendante. Les solutions techniques de la présente invention permettent de garantir efficacement l'exécution normale d'une mesure de CSI et d'une rétroaction de CSI après l'introduction par un système LTE d'un mécanisme de LBT dans un spectre non autorisé.
PCT/CN2015/077995 2015-01-30 2015-04-30 Procédé et système de mesure et de rétroaction de csi ainsi que station de base Ceased WO2016119325A1 (fr)

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