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WO2016119325A1 - Csi测量及反馈方法、csi测量及反馈系统和基站 - Google Patents

Csi测量及反馈方法、csi测量及反馈系统和基站 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)
French (fr)
Inventor
李明菊
朱亚军
张云飞
Original Assignee
宇龙计算机通信科技(深圳)有限公司
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Publication of WO2016119325A1 publication Critical patent/WO2016119325A1/zh

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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

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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Abstract

本发明提出了一种LTE系统在非授权频段工作时的CSI测量及反馈方法、系统和基站，方法包括：当有下行业务到达时，检测当前下行信道状态，并根据所述当前下行信道状态向终端发送对应于所述当前下行信道状态的CSI测量配置信令和CSI反馈配置信令；或当有下行业务到达时，向终端发送对应于指定下行信道状态的CSI测量配置信令和CSI反馈配置信令，以使所述终端在获知下行信道状态后根据所述下行信道状态对应的所述CSI测量配置信令和所述CSI反馈配置信令进行CSI测量及CSI反馈。通过本发明的技术方案，可以有效地确保LTE系统在非授权频段上引入LBT机制后CSI测量和CSI反馈的正常进行。

Description

CSI测量及反馈方法、CSI测量及反馈系统和基站
本申请要求于2015年1月30日提交中国专利局，申请号为CN 201510052163.9、发明名称为“CSI测量及反馈方法、CSI测量及反馈系统和基站”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及通信技术领域，具体而言，涉及一种LTE系统在非授权频段工作时的信道检测方法、LTE系统在非授权频段工作时的信道检测系统和一种基站。
背景技术
随着通信业务量的急剧增加，3GPP的授权频谱越来越不足以提供更高的网络容量。为了进一步提高频谱资源的利用率，3GPP正讨论如何在授权频谱的帮助下使用未授权频谱，如2.4GHz和5GHz频段。这些未授权频谱目前主要是Wi-Fi、蓝牙、雷达、医疗等系统在使用。
通常情况下，为已授权频段设计的接入技术，如LTE(Long Term Evolution，长期演进)不适合在未授权频段上使用，因为LTE这类接入技术对频谱效率和用户体验优化的要求非常高。然而，载波聚合(Carrier Aggregation，CA)功能让将LTE部署于非授权频段变为可能。3GPP提出了LAA(Licensed Assisted Access，LTE授权频谱辅助的接入)的概念，借助LTE授权频谱的帮助来使用未授权频谱。而未授权频谱可以有两种工作方式，一种是补充下行(SDL，Supplemental Downlink)，即只有下行传输子帧；另一种是TDD(Time division duplex，时分双工)模式，既包含下行传输子帧，也包含上行传输子帧。补充下行这种情况只能是借助载波聚合技术使用(如图1所示)。而TDD模式除了可以借助DC(Dual Connectivity，双连通)使用，也可以独立使用。
相比于Wi-Fi系统，工作在非授权频段的LTE系统有能力提供更高的频谱效率和更大的覆盖效果，同时基于同一个核心网让数据流量在授权频段和未授 权频段之间无缝切换。对用户来说，这意味着更好的宽带体验、更高的速率、更好的稳定性和移动便利。
现有的在非授权频谱上使用的接入技术，如Wi-Fi，具有较弱的抗干扰能力。为了避免干扰，Wi-Fi系统设计了很多干扰避免规则，如CSMA/CD(Carrier Sense Multiple Access/Collision Detection，载波监听多路访问/冲突检测方法)，这种方法的基本原理是Wi-Fi的AP(Access Point，接入点)或者终端在发送信令或者数据之前，要先监听检测周围是否有其他AP或者其他终端在发送/接收信令或数据，若有，则继续监听，直到监听到没有为止；若没有，则生成一个随机数作为退避时间，在这个退避时间内，如果没检测到有信令或数据传输，那么在退避时间结束之后，AP或终端可以开始发送信令或数据。该过程如图2所示。
但是，LTE网络中由于有很好的正交性保证了干扰水平，所以基站与用户的上下行传输不用考虑周围是否有其他基站或其他用户在传输数据。如果LTE在非授权频段上使用时也不考虑周围是否有其他设备在使用非授权频段，那么将对Wi-Fi设备带来极大的干扰。因为LTE只要有业务就进行传输，没有任何监听规则，那么Wi-Fi设备在LTE有业务传输时就不能传输，只能等到LTE业务传输完成，才能检测到信道空闲状态以进行数据传输。
所以，LTE网络在使用非授权频段时，最主要的关键点之一是确保LAA能够在公平友好的基础上和现有的接入技术(比如Wi-Fi)共存。而传统的LTE系统中没有LBT(Listen Before Talk，先听后说)的机制来避免碰撞。为了与Wi-Fi系统更好的共存，LTE引入了一种LBT机制。
如图3所示，LBT检测重复周期为10ms，LBT检测子帧1ms。图3中第一周期的LBT检测信道空闲，说明周围的干扰较小，那么这个周期内其他的子帧可以被占用。而第二个周期的LBT检测信道忙，说明周围干扰很大，那么这个周期内其他的子帧不能被占用。
这种情况下，用户用于下行调度的信道质量信息(CSI，Channel state information)如何测量并反馈，是需要考虑的问题。CSI信息包括CQI(Channel quality Indicator，信道质量指示)，RI(Rank indicator，秩指示)和PMI(Precoding matrix indicator，预编码矩阵指示)。主要问题包含以下几个：(1)何时开始测 量CSI？(2)信道状态检测为繁忙时，是否需要测量CSI，是否需要反馈，以及基于什么信号进行测量，测量周期和反馈周期是什么？(3)信道状态检测为空闲时，是否需要测量CSI，是否需要反馈，以及基于什么信号进行测量，测量周期和反馈周期是什么？(4)CSI信息在基站处是否需要更新？
因此，如何确保LTE系统在非授权频段上引入LBT机制后，CSI测量和CSI反馈的正常进行成为亟待解决的技术问题。
发明内容
本发明正是基于上述问题，提出了一种新的技术方案，可以确保LTE系统在非授权频段上引入LBT机制后CSI测量和CSI反馈的正常进行，同时确保在最新的CSI信息还未获得时能够获取可替代的CSI信息，从而使基站能够选择更合适的调制编码方式，进一步提高频谱效率和信道使用率。
有鉴于此，本发明的一方面提出了一种LTE系统在非授权频段工作时的CSI测量及反馈方法，用于基站侧，包括：当有下行业务到达时，检测当前下行信道状态，并根据所述当前下行信道状态向终端发送对应于所述当前下行信道状态的CSI测量配置信令和CSI反馈配置信令；或当有下行业务到达时，向终端发送对应于指定下行信道状态的CSI测量配置信令和CSI反馈配置信令，以使所述终端在获知下行信道状态后根据所述下行信道状态对应的CSI测量配置信令和CSI反馈配置信令进行CSI测量及CSI反馈。
在该技术方案中，当有下行业务到达，并在已知下行信道状态时，将与当前下行信道状态对应的CSI测量和CSI反馈配置信令发送至终端，或者，在未知下行信道状态时，将与指定下行信道状态对应的CSI测量和CSI反馈配置信令发送至终端，以使终端在获知下行信道状态后根据对应的CSI测量和CSI反馈配置信令进行CSI测量和CSI检测，如此，可以有效地确保LTE系统在非授权频段上引入LBT机制后CSI测量和CSI反馈的正常进行，进而保证频谱效率和信道使用率；其中，指定下行信道状态包括：下行信道繁忙状态或下行信道空闲状态。
在上述技术方案中，优选地，在发送对应于所述当前下行信道状态的 CSI测量配置信令和CSI反馈配置信令或对应于指定下行信道状态的CSI测量配置信令和CSI反馈配置信令之前，还包括：设置分别对应于下行信道繁忙状态和下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令。
在上述技术方案中，优选地，对应于所述下行信道繁忙状态的CSI测量配置信令和CSI反馈配置信令的配置内容具体包括：第一指示所述终端用于CSI测量的信号、第一CSI测量时间和频率位置、第一CSI测量周期、第一CSI反馈时间和第一CSI反馈周期；以及对应于所述下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令的配置内容具体包括：第二指示所述终端用于CSI测量的信号、第二CSI测量时间和频率位置、第二CSI测量周期、第二CSI反馈时间和第二CSI反馈周期。
在该技术方案中，通过设置与下行信道状态(下行信道繁忙和下行信道空闲)对应的CSI测量配置信令和CSI反馈配置信令，以及与下行信道繁忙状态对应的CSI测量配置信令和CSI反馈配置信令的配置内容包括但不限于：第一指示所述终端用于CSI测量的信号(用于CSI测量的信号)、第一CSI测量时间和频率位置、第一CSI测量周期、第一CSI反馈时间和第一CSI反馈周期，与下行信道空闲状态对应的CSI测量配置信令和CSI反馈配置信令的配置内容包括但不限于：第二指示所述终端用于CSI测量的信号(用于CSI测量的信号)、第二CSI测量时间和频率位置、第二CSI测量周期、第二CSI反馈时间和第二CSI反馈周期，通过将下行信道状态与CSI测量和反馈信令对应，并配置相应的主要内容，以明确地指示当下行信道状态不同时，是否需要测量及反馈CSI，以及具体基于哪些信息进行CSI测量和反馈，进而有效地确保LTE系统在非授权频段上引入LBT机制后CSI测量和CSI反馈的正常进行。
在上述技术方案中，优选地，所述第一指示所述终端用于CSI测量的信号包括以下之一或其组合：按第一周期发送的PSS/SSS信号、按第二周期发送的CRS信号、按第三周期发送的CSI-RS信号和按第四周期发送的DRS信号；所述第一CSI测量时间和频率位置为所述第一指示所述终端用于CSI测量的信号的发送时间和频率位置；所述第一CSI测量周期大于或等于所述第一周期、所述第二周期、所述第三周期和所述第四周期中最大 的一个周期；所述第一CSI反馈周期大于或等于所述第一CSI测量周期；以及所述第二指示所述终端用于CSI测量的信号包括以下之一或其组合：按第五周期发送的PSS/SSS信号、按第六周期发送的CRS信号、按第七周期发送的CSI-RS信号和按第八周期发送的DRS信号；所述第二CSI测量时间和频率位置为所述第二CSI测量配置信令提供的指示所述终端用于CSI测量的子帧号和子载波位置；所述第二CSI测量周期大于或等于所述第五周期、所述第六周期、所述第七周期和所述第八周期中最大的一个周期；所述第二CSI反馈周期大于或等于所述第二CSI测量周期，其中，所述第五周期小于或等于所述第一周期、所述第六周期小于或等于所述第二周期、所述第七周期小于或等于所述第三周期、所述第八周期小于或等于所述第四周期，所述第二CSI测量周期小于或等于所述第一CSI测量周期，所述第二CSI反馈周期小于或等于第一CSI反馈周期，以及所述第一CSI反馈时间和所述第二CSI反馈时间包括：在检测到上行信道空闲时反馈，或在所述CSI测量结束后直接反馈。
在上述技术方案中，优选地，对应于所述下行信道繁忙状态和所述下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令的配置内容具体包括：非周期性进行所述CSI测量和所述CSI反馈。
在该技术方案中，与下行信道繁忙状态对应的第一指示终端用于CSI测量的信号包括但不限于以下之一或其组合：按第一周期(大周期)发送的PSS/SSS(Primary Synchronization Signal，主同步信号/Secondary Synchronization Signal，辅同步信号)信号、按第二周期(大周期)发送的CRS(Common Reference Signal，公共参考信号)信号、按第三周期(大周期)发送的CSI-RS(Channel State Information-Reference Signal，信道状态信息参考信号)信号和按第四周期(大周期)发送的DRS(Discovery Reference Signal，发现参考信号)信号，以及与下行信道空闲状态对应的第二指示终端用于CSI测量的信号包括但不限于以下之一或其组合：按第五周期(小周期)发送的PSS/SSS信号、按第六周期(小周期)发送的CRS信号、按第七周期(小周期)发送的CSI-RS信号和按第八周期(小周期)发送的DRS信号，其中，第一周期、第二周期、第三周期和第四周期不完 全相同，第五周期、第六周期、第七周期和第八周期不完全相同，且第五周期、第六周期、第七周期和第八周期相应地分别小于或等于第一周期、第二周期、第三周期和第四周期，即可以通过多种方式告知终端进行CSI测量和CSI反馈；而下行信道繁忙状态和下行信道空闲状态对应的CSI测量和反馈的开始时间(第一CSI测量时间和频率位置及第二CSI测量时间和频率位置)分别为指示终端用于CSI测量的信号的发送时间以及信令中给出的用于CSI测量的子帧号和子载波位置；与下行信道繁忙或下行空闲状态对应的CSI反馈周期大于CSI测量周期，而CSI测量周期分别大于或等于第一周期、第二周期、第三周期和第四周期中最大的一个周期值以及第五周期、第六周期、第七周期和第八周期中最大的一个周期值；以及可以在检测到上行信道空闲或信道状态不确定的情况进行CSI反馈，即可以任意设置CSI反馈时间；当然，也可以非周期性地进行CSI测量和CSI反馈，当下行信道状态为已知或未知时，通过对应地明确基于哪些信号可以进行CSI测量及反馈，并明确CSI测量和反馈的时间和周期，进而有效地确保LTE系统在非授权频段上引入LBT机制后CSI测量和CSI反馈的正常进行。
在上述技术方案中，优选地，在所述非授权频段或授权频段上发送对应于所述下行信道繁忙状态和所述下行信道空闲状态的CSI测量配置信令、CSI反馈配置信令以及CSI反馈信息。
在该技术方案中，可以将与不同的下行信道状态对应的CSI测量配置信令和CSI反馈配置信令以及终端进行CSI测量后需要反馈的CSI信息在非授权频段或授权频段上进行发送，以提高频谱效率和信道使用率。
在上述技术方案中，优选地，当在所述非授权频段上以固定的周期重复进行信道检测时，通过RRC信令的方式直接向所述终端发送对应于所述下行信道繁忙状态或所述下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令；或当接收到所述下行业务，并在所述非授权频段上进行下行信道检测并在检测到所述下行信道空闲时，根据所述下行信道空闲的开始时间和终止时间确定所述CSI测量时间和频率位置，并通过RRC信令、MAC信令和/或DCI信令的方式向所述终端发送对应于所述下行信道空闲 状态的CSI测量配置信令和CSI反馈配置信令。
在该技术方案中，当在非授权频段上以固定的周期重复进行下行信道检测(基于FBE(Framed based equipment)的LBT机制)时，即信道检测时间是周期性重复出现的，此时CSI测量时间和频率位置，比如子帧号比较容易指示给终端，即通过直接RRC(Radio Resource Connection，无线资源连接)信令一次就能指示清楚，而后每次不管检测到信道忙闲都能依照此次的RRC信令指示的子帧号等进行测量并反馈；或者，当有下行业务到达，并在非授权频段上进行下行信道检测(基于LBE(Load based equipment)的LBT机制)，即信道检测时间非周期性出现，且在这种情况下没有信道繁忙时间，因为如果信道繁忙，就一直进行信道检测，那么只有信道检测时间和信道空闲时间，若检测到信道空闲时，此时，基站只能在每次检测到信道空闲之后，依照这次信道空闲的起始时间和终止时间设定一个CSI测量时间和频率位置，然后通过RRC信令，MAC(Medium access control，媒体接入控制)信令或者DCI(Downlink control indicator，下行控制指示)信令告知终端CSI测量时间和频率位置；如此，可以确保在不同的LBT机制下、不同信道状态时如何将CSI测量时间和频率位置告知给终端，进而确保LTE系统在非授权频段上引入LBT机制后CSI测量和CSI反馈的正常进行。
在上述技术方案中，优选地，在信道检测时间后的相邻子帧发送对应于所述下行信道繁忙状态的CSI测量配置信令和CSI反馈配置信令；或当检测到所述下行信道空闲时，向所述终端发送信道空闲指示，以使所述终端收到所述信道空闲指示后根据接收到的对应于所述下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令进行所述CSI测量及所述CSI反馈。
在该技术方案中，当不管下行信道忙闲都要测量CSI时，基站可以在信道检测时间之后相邻的子帧发送用于测量CSI的信号，而终端可以在信道检测时间之后相邻的子帧测量CSI并进行反馈(此种方法适用于基于FBE的LBT机制)；或者，当基站在做完下行信道检测并检测到下行信道空闲时，立马发送信道空闲指示，以使终端在收到信道空闲指示后，马上进行CSI测量，此时，基站在终端收到信道空闲指示后以及能够进行CSI 测量所需的时间之后发送用于CSI测量的信号，也就是使终端正好收到信道空闲指示后，可以使进行CSI测量时的信号也在发送(此种方法适用于基于FBE和LBE的LBT机制)；如此，可以实现在合适的子帧发送指示终端用于CSI测量的信号，以有效地减少当基站检测到信道空闲之后而终端测量并反馈CSI这段时间内的时延，使终端可以尽早地测量并反馈CSI，进而提高频谱效率和信道使用率。
在上述技术方案中，优选地，在接收到所述CSI反馈之前，采用存储的所述终端反馈的相邻时间的CSI信息作为当前CSI信息，或者采用最低的调制编码方式，或者采用根据所述基站所属的小区的RRM测量结果、与所述小区相邻的其他小区的RRM测量结果以及所述相邻的其他小区的信道繁忙或开关状态确定的当前CSI信息；以及所述采用存储的所述终端反馈的相邻时间的CSI信息作为当前CSI信息具体包括：当所述相邻时间的CSI信息为信道繁忙状态的CSI信息时，根据所述相邻时间的CSI信息、与所述相邻时间的CSI信息对应的信道检测时的RSSI信息以及当前所述信道检测时的RSSI信息确定所述当前CSI信息；或当所述相邻时间的CSI信息为下行信道繁忙状态的CSI信息时，根据所述基站所属的小区的RSRP信息与当前所述信道检测时的RSSI信息确定所述当前CSI信息。
在该技术方案中，在接收到终端最新测量并反馈的CSI之前，基站可以通过以下几种方法获得当前CSI信息(可替代的CSI信息)，包括：采用基站存储的终端反馈的相邻时间的CSI信息(最近一次的CSI信息)，或者采用基站所属的小区的RRM(Radio resource management，无线资源管理)测量结果、与该小区相邻的其他小区的RRM测量结果以及相邻的其他小区的信道繁忙或开关状态确定当前CSI信息，比如当前CSI信息＝当前小区(基站所属的小区)的RSRP(Reference signal receiving power，参考信号接收功率)/(当前小区的RSRP+周围较强的处于开状态的小区的RSRP)；如此，可以使基站能偶选择更合适的调制编码方式，或者采用最低的调制编码方式。
其中，采用基站存储的终端反馈的相邻时间的CSI信息作为当前CSI信息具体包括：若最近的一次相隔时间较短，而且也是下行信道空闲状态 的CSI信息；若最近的一次相隔时间较短，而且是下行信道繁忙状态的CSI信息，则根据相邻的CSI信息(旧的CSI信息)以及与之对应的信道检测时的RSSI(Received signal strength indication，接收的信号强度指示)信息，结合当前信道检测时的RSSI信息(新的RSSI信息)确定当前CSI信息，比如，当前CSI信息＝(新的RSSI/旧的RSSI)*旧的CSI，或者采用基站所属的小区的RSRP信息和当前信道检测时的RSSI信息确定当前CSI信息，比如当前CSI信息＝基站所属的小区的RSRP/新的RSSI。
根据本发明的另一方面提出了一种LTE系统在非授权频段工作时的CSI测量及反馈系统，用于基站侧，包括：控制单元，用于当有下行业务到达时，控制检测当前下行信道状态，并控制根据所述当前下行信道状态向终端发送对应于所述当前下行信道状态的CSI测量配置信令和CSI反馈配置信令，或用于当有下行业务到达时，控制向终端发送对应于指定下行信道状态的CSI测量配置信令和CSI反馈配置信令，以使所述终端在获知下行信道状态后根据所述下行信道状态对应的CSI测量配置信令和CSI反馈配置信令进行CSI测量及CSI反馈。
在该技术方案中，当有下行业务到达，并在已知下行信道状态时，将与当前下行信道状态对应的CSI测量和CSI反馈配置信令发送至终端，或者，在未知下行信道状态时，将与指定下行信道状态对应的CSI测量和CSI反馈配置信令发送至终端，以使终端在获知下行信道状态后根据对应的CSI测量和CSI反馈配置信令进行CSI测量和CSI检测，如此，可以有效地确保LTE系统在非授权频段上引入LBT机制后CSI测量和CSI反馈的正常进行，进而保证频谱效率和信道使用率；其中，指定下行信道状态包括：下行信道繁忙状态或下行信道空闲状态。
在上述技术方案中，优选地，还包括：设置单元，用于在发送对应于所述当前下行信道状态的CSI测量配置信令和CSI反馈配置信令或对应于指定下行信道状态的CSI测量配置信令和CSI反馈配置信令之前，设置分别对应于下行信道繁忙状态和下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令。
在上述技术方案中，优选地，所述设置单元具体用于：设置对应于所 述下行信道繁忙状态的CSI测量配置信令和CSI反馈配置信令的配置内容具体包括：第一指示所述终端用于CSI测量的信号、第一CSI测量时间和频率位置、第一CSI测量周期、第一CSI反馈时间和第一CSI反馈周期；以及设置对应于所述下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令的配置内容具体包括：第二指示所述终端用于CSI测量的信号、第二CSI测量时间和频率位置、第二CSI测量周期、第二CSI反馈时间和第二CSI反馈周期。
在该技术方案中，通过设置与下行信道状态(下行信道繁忙和下行信道空闲)对应的CSI测量配置信令和CSI反馈配置信令，以及与下行信道繁忙状态对应的CSI测量配置信令和CSI反馈配置信令的配置内容包括但不限于：第一指示所述终端用于CSI测量的信号(用于CSI测量的信号)、第一CSI测量时间和频率位置、第一CSI测量周期、第一CSI反馈时间和第一CSI反馈周期，与下行信道空闲状态对应的CSI测量配置信令和CSI反馈配置信令的配置内容包括但不限于：第二指示所述终端用于CSI测量的信号(用于CSI测量的信号)、第二CSI测量时间和频率位置、第二CSI测量周期、第二CSI反馈时间和第二CSI反馈周期，通过将下行信道状态与CSI测量和反馈信令对应，并配置相应的主要内容，以明确地指示当下行信道状态不同时，是否需要测量及反馈CSI，以及具体基于哪些信息进行CSI测量和反馈，进而有效地确保LTE系统在非授权频段上引入LBT机制后CSI测量和CSI反馈的正常进行。
在上述技术方案中，优选地，所述设置单元具体还用于：设置所述第一指示所述终端用于CSI测量的信号包括以下之一或其组合：按第一周期发送的PSS/SSS信号、按第二周期发送的CRS信号、按第三周期发送的CSI-RS信号和按第四周期发送的DRS信号；设置所述第一CSI测量时间和频率位置为所述第一指示所述终端用于CSI测量的信号的发送时间和频率位置；设置所述第一CSI测量周期大于或等于所述第一周期、所述第二周期、所述第三周期和所述第四周期中最大的一个周期；设置所述第一CSI反馈周期大于或等于所述第一CSI测量周期；以及设置所述第二指示所述终端用于CSI测量的信号包括以下之一或其组合：按第五周期发送的 PSS/SSS信号、按第六周期发送的CRS信号、按第七周期发送的CSI-RS信号和按第八周期发送的DRS信号；设置所述第二CSI测量时间和频率位置为所述第二CSI测量配置信令提供的指示所述终端用于CSI测量的子帧号和子载波位置；设置所述第二CSI测量周期大于或等于所述第五周期、所述第六周期、所述第七周期和所述第八周期中最大的一个周期；设置所述第二CSI反馈周期大于或等于所述第二CSI测量周期，其中，所述第五周期小于或等于所述第一周期、所述第六周期小于或等于所述第二周期、所述第七周期小于或等于所述第三周期、所述第八周期小于或等于所述第四周期，所述第二CSI测量周期小于或等于所述第一CSI测量周期，所述第二CSI反馈周期小于或等于第一CSI反馈周期，以及设置所述第一CSI反馈时间和所述第二CSI反馈时间包括：在检测到上行信道空闲时反馈，或在所述CSI测量结束后直接反馈。
在上述技术方案中，优选地，所述设置单元具体还用于：设置对应于所述下行信道繁忙状态和所述下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令的配置内容具体包括：非周期性进行所述CSI测量和所述CSI反馈。
在该技术方案中，与信道繁忙状态对应的第一指示终端用于CSI测量的信号包括但不限于以下之一或其组合：按第一周期(大周期)发送的PSS按第一周期发送的PSS/SSS(Primary Synchronization Signal，主同步信号/Secondary Synchronization Signal，辅同步信号)信号、按第二周期(大周期)发送的CRS(Common Reference Signal，公共参考信号)信号、按第三周期(大周期)发送的CSI-RS(Channel State Information-Reference Signal，信道状态信息参考信号)信号和按第四周期(大周期)发送的DRS(Discovery Reference Signal，发现参考信号)信号，以及与下行信道空闲状态对应的第二指示终端用于CSI测量的信号包括但不限于以下之一或其组合：按第五周期(小周期)发送的PSS/SSS信号、按第六周期(小周期)发送的CRS信号、按第七周期(小周期)发送的CSI-RS信号和按第八周期(小周期)发送的DRS信号，其中，第一周期、第二周期、第三周期和第四周期不完全相同，第五周期、第六周期、第七周期和第八周期不完全相同，且第五 周期、第六周期、第七周期和第八周期相应地分别小于或等于第一周期、第二周期、第三周期和第四周期，即可以通过多种方式告知终端进行CSI测量和CSI反馈；而下行信道繁忙状态和下行信道空闲状态对应的CSI测量和反馈的开始时间(第一CSI测量时间和频率位置及第二CSI测量时间和频率位置)分别为指示终端用于CSI测量的信号的发送时间以及信令中给出的用于CSI测量的子帧号和子载波位置；与下行信道繁忙或下行空闲状态对应的CSI反馈周期大于CSI测量周期，而CSI测量周期分别大于或等于第一周期、第二周期、第三周期和第四周期中最大的一个周期值以及第五周期、第六周期、第七周期和第八周期中最大的一个周期值；以及可以在检测到上行信道空闲或信道状态不确定的情况进行CSI反馈，即可以任意设置CSI反馈时间；当然，也可以非周期性地进行CSI测量和CSI反馈，当信道状态为已知或未知时，通过对应地明确基于哪些信号可以进行CSI测量及反馈，并明确CSI测量和反馈的时间和周期，进而有效地确保LTE系统在非授权频段上引入LBT机制后CSI测量和CSI反馈的正常进行。
在上述技术方案中，优选地，所述控制单元具体用于：控制在所述非授权频段或授权频段上发送对应于所述下行信道繁忙状态和所述下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令以及CSI反馈信息。
在该技术方案中，可以将与不同的下行信道状态对应的CSI测量配置信令和CSI反馈配置信令以及终端进行CSI测量后需要反馈的CSI信息在非授权频段或授权频段上进行发送，以提高频谱效率和信道使用率。
在上述技术方案中，优选地，所述控制单元具体还用于：当在所述非授权频段上以固定的周期重复进行信道检测时，控制通过RRC信令的方式直接向所述终端发送对应于所述下行信道繁忙状态或所述下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令；或当接收到所述下行业务，并在所述非授权频段上进行下行信道检测并在检测到所述下行信道空闲时，控制根据所述下行信道空闲的开始时间和终止时间确定所述CSI测量时间和频率位置，并通过RRC信令、MAC信令或DCI信令的方式向所述终端发送对应于所述下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令。
在该技术方案中，当在非授权频段上以固定的周期重复进行下行信道检测(基于FBE(Framed based equipment)的LBT机制)时，即信道检测时间是周期性重复出现的，此时CSI测量时间和频率位置，比如子帧号比较容易指示给终端，即通过直接RRC(Radio Resource Connection，无线资源连接)信令一次就能指示清楚，而后每次不管检测到信道忙闲都能依照此次的RRC信令指示的子帧号等进行测量并反馈；或者，当有下行业务到达，并在非授权频段上进行下行信道检测(基于LBE(Load based equipment)的LBT机制)，即信道检测时间非周期性出现，且在这种情况下没有信道繁忙时间，因为如果信道繁忙，就一直进行信道检测，那么只有信道检测时间和信道空闲时间，若检测到信道空闲时，此时，基站只能在每次检测到信道空闲之后，依照这次信道空闲的起始时间和终止时间设定一个CSI测量时间和频率位置，然后通过RRC信令，MAC(Medium access control，媒体接入控制)信令或者DCI(Downlink control indicator，下行控制指示)信令告知终端CSI测量时间和频率位置，如此，可以确保在不同的LBT机制下、不同信道状态时如何将CSI测量时间和频率位置告知给终端，进而确保LTE系统在非授权频段上引入LBT机制后CSI测量和CSI反馈的正常进行。
在上述技术方案中，优选地，所述控制单元具体还用于：控制在信道检测时间后的相邻子帧发送对应于所述下行信道繁忙状态的CSI测量配置信令和CSI反馈配置信令；或当检测到所述下行信道空闲时，控制向所述终端发送信道空闲指示，以使所述终端收到所述信道空闲指示后根据接收到的对应于所述下行信道空闲状态的CSI测量配置信令、CSI反馈配置信令进行所述CSI测量及所述CSI反馈。
在该技术方案中，当不管下行信道忙闲都要测量CSI时，基站可以在信道检测时间之后相邻的子帧发送用于测量CSI的信号，而终端可以在信道检测时间之后相邻的子帧测量CSI并进行反馈(此种方法适用于基于FBE的LBT机制)；或者，当基站在做完下行信道检测并检测到下行信道空闲时，立马发送信道空闲指示，以使终端在收到信道空闲指示后，马上进行CSI测量，此时，基站在终端收到信道空闲指示后以及能够进行CSI 测量所需的时间之后发送用于CSI测量的信号，也就是使终端正好收到信道空闲指示后，可以使进行CSI测量时的信号也在发送(此种方法适用于基于FBE和LBE的LBT机制)；如此，可以实现在合适的子帧发送指示终端用于CSI测量的信号，以有效地减少当基站检测到信道空闲之后而终端测量并反馈CSI这段时间内的时延，使终端可以尽早地测量并反馈CSI，进而提高频谱效率和信道使用率。
在上述技术方案中，优选地，所述控制单元还用于：在接收到所述CSI反馈之前，控制采用存储的所述终端反馈的相邻时间的CSI信息作为当前CSI信息，或者控制采用最低的调制编码方式，或者控制采用根据所述基站所属的小区的RRM测量结果、与所述小区相邻的其他小区的RRM测量结果以及所述相邻的其他小区的信道繁忙或开关状态确定的当前CSI信息；以及所述控制采用存储的所述终端反馈的相邻时间的CSI信息作为当前CSI信息具体包括：当所述相邻时间的CSI信息为信道繁忙状态的CSI信息时，控制根据所述相邻时间的CSI信息、与所述相邻时间的CSI信息对应的信道检测时的RSSI信息以及当前所述信道检测时的RSSI信息确定所述当前CSI信息；或当所述相邻时间的CSI信息为下行信道繁忙状态的CSI信息时，根据所述基站所属的小区的RSRP信息与当前所述信道检测时的RSSI信息确定所述当前CSI信息。
在该技术方案中，在接收到终端最新测量并反馈的CSI之前，基站可以通过以下几种方法获得当前CSI信息(可替代的CSI信息)，包括：采用基站存储的终端反馈的相邻时间的CSI信息(最近一次的CSI信息)，或者采用基站所属的小区的RRM(Radio resource management，无线资源管理)测量结果、与该小区相邻的其他小区的RRM测量结果以及相邻的其他小区的信道繁忙或开关状态确定当前CSI信息，比如当前CSI信息＝当前小区(基站所属的小区)的RSRP(Reference signal receiving power，参考信号接收功率)/(当前小区的RSRP+周围较强的处于开状态的小区的RSRP)；如此，可以使基站能偶选择更合适的调制编码方式，或者采用最低的调制编码方式。
其中，采用基站存储的终端反馈的相邻时间的CSI信息作为当前CSI 信息具体包括：若最近的一次相隔时间较短，而且也是下行信道空闲状态的CSI信息；若最近的一次相隔时间较短，而且是下行信道繁忙状态的CSI信息，则根据相邻的CSI信息(旧的CSI信息)以及与之对应的信道检测时的RSSI(Received signal strength indication，接收的信号强度指示)信息，结合当前信道检测时的RSSI信息(新的RSSI信息)确定当前CSI信息，比如，当前CSI信息＝(新的RSSI/旧的RSSI)*旧的CSI，或者采用基站所属的小区的RSRP信息和当前信道检测时的RSSI信息确定当前CSI信息，比如当前CSI信息＝基站所属的小区的RSRP/新的RSSI。
根据本发明的又一方面，提出了一种基站，所述基站包括通信总线、输出装置、存储器以及处理器，其中：
所述通信总线，用于实现所述输出装置、存储器以及处理器之间的连接通信；
所述输出装置，用于发送对应于当前下行信道状态的CSI测量配置信令和CSI反馈配置信令，发送对应于指定下行信道状态的CSI测量配置信令和CSI反馈配置信令；
所述存储器中存储一组程序代码，且处理器调用存储器中存储的程序代码，用于执行以下操作：
当有下行业务到达时，检测当前下行信道状态，并根据所述当前下行信道状态通过所述输出装置向终端发送对应于所述当前下行信道状态的CSI测量配置信令和CSI反馈配置信令；或
当有下行业务到达时，通过所述输出装置向终端发送对应于指定下行信道状态的CSI测量配置信令和CSI反馈配置信令，以使所述终端在获知下行信道状态后根据所述下行信道状态对应的CSI测量配置信令和CSI反馈配置信令进行CSI测量及CSI反馈。
在上述技术方案中，优选地，在所述处理器发送对应于所述当前下行信道状态的CSI测量配置信令和CSI反馈配置信令或对应于指定下行信道状态的CSI测量配置信令和CSI反馈配置信令之前，还用于执行以下操作：
设置分别对应于下行信道繁忙状态和下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令。
在上述技术方案中，优选地，对应于所述下行信道繁忙状态的CSI测量配置信令和CSI反馈配置信令的配置内容具体包括：第一指示所述终端用于CSI测量的信号、第一CSI测量时间和频率位置、第一CSI测量周期、第一CSI反馈时间和第一CSI反馈周期；以及
对应于所述下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令的配置内容具体包括：第二指示所述终端用于CSI测量的信号、第二CSI测量时间和频率位置、第二CSI测量周期、第二CSI反馈时间和第二CSI反馈周期。
在上述技术方案中，优选地，所述第一指示所述终端用于CSI测量的信号包括以下之一或其组合：按第一周期发送的PSS/SSS信号、按第二周期发送的CRS信号、按第三周期发送的CSI-RS信号和按第四周期发送的DRS信号；
所述第一CSI测量时间和频率位置为所述第一指示所述终端用于CSI测量的信号的发送时间和频率位置；
所述第一CSI测量周期大于或等于所述第一周期、所述第二周期、所述第三周期和所述第四周期中最大的一个周期；
所述第一CSI反馈周期大于或等于所述第一CSI测量周期；以及
所述第二指示所述终端用于CSI测量的信号包括以下之一或其组合：按第五周期发送的PSS/SSS信号、按第六周期发送的CRS信号、按第七周期发送的CSI-RS信号和按第八周期发送的DRS信号；
所述第二CSI测量时间和频率位置为所述第二CSI测量配置信令提供的指示所述终端用于CSI测量的子帧号和子载波位置；
所述第二CSI测量周期大于或等于所述第五周期、所述第六周期、所述第七周期和所述第八周期中最大的一个周期；
所述第二CSI反馈周期大于或等于所述第二CSI测量周期，其中，所述第五周期小于或等于所述第一周期、所述第六周期小于或等于所述第二周期、所述第七周期小于或等于所述第三周期、所述第八周期小于或等于所述第四周期，所述第二CSI测量周期小于或等于所述第一CSI测量周期，所述第二CSI反馈周期小于或等于第一CSI反馈周期，以及
所述第一CSI反馈时间和所述第二CSI反馈时间包括：在检测到上行信道空闲时反馈，或在所述CSI测量结束后直接反馈。
在上述技术方案中，优选地，对应于所述下行信道繁忙状态和所述下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令的配置内容具体包括：非周期性进行所述CSI测量和所述CSI反馈。
在上述技术方案中，优选地，所述处理器还用于执行以下操作：
在所述非授权频段或授权频段上发送对应于所述下行信道繁忙状态、所述下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令以及CSI反馈信息。
在上述技术方案中，优选地，所述处理器还用于执行以下操作：
当在所述非授权频段上以固定的周期重复进行信道检测时，通过RRC信令的方式直接向所述终端发送对应于所述下行信道繁忙状态或所述下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令；或
当接收到所述下行业务，并在所述非授权频段上进行下行信道检测并在检测到所述下行信道空闲时，根据所述下行信道空闲的开始时间和终止时间确定所述CSI测量时间和频率位置，并通过RRC信令、MAC信令和/或DCI信令的方式向所述终端发送对应于所述下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令。
在上述技术方案中，优选地，所述处理器还用于执行以下操作：
在信道检测时间后的相邻子帧发送对应于所述下行信道繁忙状态的CSI测量配置信令和CSI反馈配置信令；或
当检测到所述下行信道空闲时，向所述终端发送信道空闲指示，以使所述终端收到所述信道空闲指示后根据接收到的对应于所述下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令进行所述CSI测量及所述CSI反馈。
在上述技术方案中，优选地，所述处理器还用于执行以下操作：
在接收到所述CSI反馈之前，采用存储的所述终端反馈的相邻时间的CSI信息作为当前CSI信息，或者采用最低的调制编码方式，或者采用根据所述基站所属的小区的RRM测量结果、与所述小区相邻的其他小区的 RRM测量结果以及所述相邻的其他小区的信道繁忙或开关状态确定的当前CSI信息；以及
所述采用存储的所述终端反馈的相邻时间的CSI信息作为当前CSI信息具体包括：
当所述相邻时间的CSI信息为信道繁忙状态的CSI信息时，根据所述相邻时间的CSI信息、与所述相邻时间的CSI信息对应的信道检测时的RSSI信息以及当前所述信道检测时的RSSI信息确定所述当前CSI信息；或
当所述相邻时间的CSI信息为信道繁忙状态的CSI信息时，根据所述基站所属的小区的RSRP信息与当前所述信道检测时的RSSI信息确定所述当前CSI信息。
在该技术方案中，基站通过该LTE系统在非授权频段工作时的CSI测量及反馈系统，当有下行业务到达，并在已知下行信道状态时，将与当前下行信道状态对应的CSI测量和CSI反馈配置信令发送至终端，或者，在未知下行信道状态时，将与指定下行信道状态对应的CSI测量和CSI反馈配置信令发送至终端，以使终端在获知下行信道状态后根据对应的CSI测量和CSI反馈配置信令进行CSI测量和CSI检测，如此，可以有效地确保LTE系统在非授权频段上引入LBT机制后CSI测量和CSI反馈的正常进行，同时确保在最新的CSI信息还未获得时能够获取可替代的CSI信息，从而使基站能够选择更合适的调制编码方式，进一步提高频谱效率和信道使用率。
通过本发明的技术方案，可以确保LTE系统在非授权频段上引入LBT机制后CSI测量和CSI反馈的正常进行，同时确保在最新的CSI信息还未获得时能够获取可替代的CSI信息，从而使基站能够选择更合适的调制编码方式，进一步提高频谱效率和信道使用率。
附图说明
图1示出了非授权频谱的两种工作方式的示意图；
图2示出了Wi-Fi系统的干扰避免规则的示意图；
图3示出了LTE中的LBT帧结构的示意图；
图4示出了根据本发明的实施例的LTE系统在非授权频段工作时的CSI测量及反馈方法的流程示意图；
图5示出了根据本发明的实施例的LTE系统在非授权频段工作时的基于帧结构的LBT机制下的CSI测量示意图；
图6示出了根据本发明的实施例的LTE系统在非授权频段工作时的基于负载(数据业务)的LBT机制下的CSI测量示意图；
图7示出了根据本发明的实施例的信道忙闲都测量CSI的时延示意图；
图8示出了根据本发明的实施例的信道空闲时测量CSI的时延示意图；
图9示出了根据本发明的实施例的LTE系统在非授权频段工作时的CSI测量及反馈系统的结构示意图；
图10示出了根据本发明的实施例的基站的结构示意图；
图11示出了根据本发明的实施例的另一种基站的结构示意图。
具体实施方式
为了可以更清楚地理解本发明的上述目的、特征和优点，下面结合附图和具体实施方式对本发明进行进一步的详细描述。需要说明的是，在不冲突的情况下，本申请的实施例及实施例中的特征可以相互组合。
在下面的描述中阐述了很多具体细节以便于充分理解本发明，但是，本发明还可以采用其他不同于在此描述的其他方式来实施，因此，本发明的保护范围并不受下面公开的具体实施例的限制。
图4示出了根据本发明的实施例的LTE系统在非授权频段工作时的CSI测量及反馈方法的流程示意图。
如图4所示，根据本发明的实施例的LTE系统在非授权频段工作时的CSI测量及反馈方法，用于基站侧，包括：步骤402，当有下行业务到达时，检测当前下行信道状态，并根据所述当前下行信道状态向终端发送对应于所述当前下行信道状态的CSI测量配置信令和CSI反馈配置信令；或当有下行业务到达时，向终端发送对应于指定下行信道状态的CSI测量配置信令和CSI反馈配置信令，以使所述终端在获知下行信道状态后根据所述下 行信道状态对应的CSI测量配置信令和CSI反馈配置信令进行CSI测量及CSI反馈。
在该技术方案中，当有下行业务到达，并在已知下行信道状态时，将与当前下行信道状态对应的CSI测量和CSI反馈配置信令发送至终端，或者，在未知下行信道状态时，将与指定下行信道状态对应的CSI测量和CSI反馈配置信令发送至终端，以使终端在获知下行信道状态后根据对应的CSI测量和CSI反馈配置信令进行CSI测量和CSI检测，如此，可以有效地确保LTE系统在非授权频段上引入LBT机制后CSI测量和CSI反馈的正常进行，进而保证频谱效率和信道使用率；其中，指定下行信道状态包括：下行信道繁忙状态或下行信道空闲状态。
在上述技术方案中，优选地，在发送对应于所述当前下行信道状态的CSI测量配置信令和CSI反馈配置信令或对应于指定下行信道状态的CSI测量配置信令和CSI反馈配置信令之前，还包括：设置分别对应于下行信道繁忙状态和下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令。
在上述技术方案中，优选地，对应于所述下行信道繁忙状态的CSI测量配置信令和CSI反馈配置信令的配置内容具体包括：第一指示所述终端用于CSI测量的信号、第一CSI测量时间和频率位置、第一CSI测量周期、第一CSI反馈时间和第一CSI反馈周期；以及对应于所述下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令的配置内容具体包括：第二指示所述终端用于CSI测量的信号、第二CSI测量时间和频率位置、第二CSI测量周期、第二CSI反馈时间和第二CSI反馈周期。
在该技术方案中，通过设置与下行信道状态(下行信道繁忙和下行信道空闲)对应的CSI测量配置信令和CSI反馈配置信令，以及与信道繁忙状态对应的CSI测量配置信令和CSI反馈配置信令的配置内容包括但不限于：第一指示所述终端用于CSI测量的信号(用于CSI测量的信号)、第一CSI测量时间和频率位置、第一CSI测量周期、第一CSI反馈时间和第一CSI反馈周期，与下行信道空闲状态对应的CSI测量配置信令和CSI反馈配置信令的配置内容包括但不限于：第二指示所述终端用于CSI测量的信号(用于CSI测量的信号)、第二CSI测量时间和频率位置、第二CSI 测量周期、第二CSI反馈时间和第二CSI反馈周期，通过将下行信道状态与CSI测量和反馈信令对应，并配置相应的主要内容，以明确地指示当下行信道状态不同时，是否需要测量及反馈CSI，以及具体基于哪些信息进行CSI测量和反馈，进而有效地确保LTE系统在非授权频段上引入LBT机制后CSI测量和CSI反馈的正常进行。
在上述技术方案中，优选地，所述第一指示所述终端用于CSI测量的信号包括以下之一或其组合：按第一周期发送的PSS/SSS信号、按第二周期发送的CRS信号、按第三周期发送的CSI-RS信号和按第四周期发送的DRS信号；所述第一CSI测量时间和频率位置为所述第一指示所述终端用于CSI测量的信号的发送时间和频率位置；所述第一CSI测量周期大于或等于所述第一周期、所述第二周期、所述第三周期和所述第四周期中最大的一个周期；所述第一CSI反馈周期大于或等于所述第一CSI测量周期；以及所述第二指示所述终端用于CSI测量的信号包括以下之一或其组合：按第五周期发送的PSS/SSS信号、按第六周期发送的CRS信号、按第七周期发送的CSI-RS信号和按第八周期发送的DRS信号；所述第二CSI测量时间和频率位置为所述第二CSI测量配置信令提供的指示所述终端用于CSI测量的子帧号和子载波位置；所述第二CSI测量周期大于或等于所述第五周期、所述第六周期、所述第七周期和所述第八周期中最大的一个周期；所述第二CSI反馈周期大于或等于所述第二CSI测量周期，其中，所述第五周期小于或等于所述第一周期、所述第六周期小于或等于所述第二周期、所述第七周期小于或等于所述第三周期、所述第八周期小于或等于所述第四周期，所述第二CSI测量周期小于或等于所述第一CSI测量周期，所述第二CSI反馈周期小于或等于第一CSI反馈周期，以及所述第一CSI反馈时间和所述第二CSI反馈时间包括：在检测到上行信道空闲时反馈，或在所述CSI测量结束后直接反馈。
在上述技术方案中，优选地，对应于所述下行信道繁忙状态和所述下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令的配置内容具体包括：非周期性进行所述CSI测量和所述CSI反馈。
在该技术方案中，与下行信道繁忙状态对应的第一指示终端用于CSI 测量的信号包括但不限于以下之一或其组合：按第一周期(大周期)发送的PSS按第一周期发送的PSS/SSS(Primary Synchronization Signal，主同步信号/Secondary Synchronization Signal，辅同步信号)信号、按第二周期(大周期)发送的CRS(Common Reference Signal，公共参考信号)信号、按第三周期发送的CSI-RS(Channel State Information-Reference Signal，信道状态信息参考信号)信号和按第四周期发送的DRS(Discover Reference Signal，发现参考信号)信号，以及与下行信道空闲状态对应的第二指示终端用于CSI测量的信号包括但不限于以下之一或其组合：按第五周期(小周期)发送的PSS/SSS信号、按第六周期(小周期)发送的CRS信号、按第七周期(小周期)发送的CSI-RS信号和按第八周期(小周期)发送的DRS信号，其中，第一周期、第二周期、第三周期和第四周期不完全相同，第五周期、第六周期、第七周期和第八周期不完全相同，且第五周期、第六周期、第七周期和第八周期相应地分别小于或等于第一周期、第二周期、第三周期和第四周期，即可以通过多种方式告知终端进行CSI测量和CSI反馈；而下行信道繁忙状态和下行信道空闲状态对应的CSI测量和反馈的开始时间(第一CSI测量时间和频率位置及第二CSI测量时间和频率位置)分别为指示终端用于CSI测量的信号的发送时间以及信令中给出的用于CSI测量的子帧号和子载波位置；与下行信道繁忙或空闲状态对应的CSI反馈周期大于CSI测量周期，而CSI测量周期分别大于或等于第一周期、第二周期、第三周期和第四周期中最大的一个周期值以及第五周期、第六周期、第七周期和第八周期中最大的一个周期值；以及可以在检测到上行信道空闲或信道状态不确定的情况进行CSI反馈，即可以任意设置CSI反馈时间；当然，也可以非周期性地进行CSI测量和CSI反馈，当下行信道状态为已知或未知时，通过对应地明确基于哪些信号可以进行CSI测量及反馈，并明确CSI测量和反馈的时间和周期，进而有效地确保LTE系统在非授权频段上引入LBT机制后CSI测量和CSI反馈的正常进行。
在上述技术方案中，优选地，在所述非授权频段或授权频段上发送对应于所述下行信道繁忙状态和所述下行信道空闲状态的CSI测量配置信令、CSI反馈配置信令以及CSI反馈信息。
在该技术方案中，可以将与不同的下行信道状态对应的CSI测量配置信令和CSI反馈配置信令以及终端进行CSI测量后需要反馈的CSI信息在非授权频段或授权频段上进行发送，以提高频谱效率和信道使用率。
图5示出了根据本发明的实施例的LTE系统在非授权频段工作时的基于帧结构的LBT机制下的CSI测量示意图。
图6示出了根据本发明的实施例的按固定检测周期重复设置信道检测时间的帧结构的示意图。
在上述技术方案中，优选地，当在所述非授权频段上以固定的周期重复进行信道检测时，通过RRC信令的方式直接向所述终端发送对应于所述下行信道繁忙状态或所述下行信道空闲状态的述CSI测量配置信令和CSI反馈配置信令；或当接收到所述下行业务，并在所述非授权频段上进行下行信道检测并在检测到所述下行信道空闲时，根据所述下行信道空闲的开始时间和终止时间确定所述CSI测量时间和频率位置，并通过RRC信令、MAC信令和/或DCI信令的方式向所述终端发送对应于所述下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令。
在该技术方案中，当在非授权频段上以固定的周期重复进行下行信道检测(基于FBE(Framed based equipment)的LBT机制)时，如图5所示，即信道检测时间是周期性重复出现的，此时CSI测量时间和频率位置，比如子帧号比较容易指示给终端，即通过直接RRC(Radio Resource Connection，无线资源连接)信令一次就能指示清楚，而后每次不管检测到信道忙闲都能依照此次的RRC信令指示的子帧号等进行测量并反馈；或者，当有下行业务到达，并在非授权频段上进行下行信道检测(基于LBE(Load based equipment)的LBT机制)，即信道检测时间非周期性出现，如图6所示，且在这种情况下没有信道繁忙时间，因为如果信道繁忙，就一直进行信道检测，那么只有信道检测时间和信道空闲时间，若检测到信道空闲时，此时，基站只能在每次检测到信道空闲之后，依照这次信道空闲的起始时间和终止时间设定一个CSI测量时间和频率位置，然后通过RRC信令，MAC(Medium access control，媒体接入控制)信令或者DCI(Downlink control indicator，下行控制指示)信令告知终端CSI测量时间和频率位置； 如此，可以确保在不同的LBT机制下、不同信道状态时如何将CSI测量时间和频率位置告知给终端，进而确保LTE系统在非授权频段上引入LBT机制后CSI测量和CSI反馈的正常进行。
图7示出了根据本发明的实施例的信道忙闲都测量CSI的时延示意图。
图8示出了根据本发明的实施例的信道空闲时测量CSI的时延示意图。
在上述技术方案中，优选地，在信道检测时间后的相邻子帧发送对应于所述下行信道繁忙状态的CSI测量配置信令和CSI反馈配置信令；或当检测到所述下行信道空闲时，向所述终端发送信道空闲指示，以使所述终端收到所述信道空闲指示后根据接收到的对应于所述下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令进行所述CSI测量及所述CSI反馈。
在该技术方案中，当不管下行信道忙闲都要测量CSI时，基站可以在信道检测时间之后相邻的子帧发送用于测量CSI的信号，而终端可以在信道检测时间之后相邻的子帧测量CSI并进行反馈(此种方法适用于基于FBE的LBT机制)；或者，当基站在做完下行信道检测并检测到下行信道空闲时，立马发送信道空闲指示，以使终端在收到信道空闲指示后，马上进行CSI测量，此时，基站在终端收到信道空闲指示后以及能够进行CSI测量所需的时间之后发送用于CSI测量的信号，也就是使终端正好收到信道空闲指示后，可以使进行CSI测量时的信号也在发送(此种方法适用于基于FBE和LBE的LBT机制)；如此，可以实现在合适的子帧发送指示终端用于CSI测量的信号，以有效地减少当基站检测到信道空闲之后而终端测量并反馈CSI这段时间内的时延，使终端可以尽早地测量并反馈CSI，进而提高频谱效率和信道使用率，如图7和图8所示。
在上述技术方案中，优选地，在接收到所述CSI反馈之前，采用存储的所述终端反馈的相邻时间的CSI信息作为当前CSI信息，或者采用最低的调制编码方式，或者采用根据所述基站所属的小区的RRM测量结果、与所述小区相邻的其他小区的RRM测量结果以及所述相邻的其他小区的信道繁忙或开关状态确定的当前CSI信息；以及所述采用存储的所述终端反馈的相邻时间的CSI信息作为当前CSI信息具体包括：当所述相邻时间的CSI信息为信道繁忙状态的CSI信息时，根据所述相邻时间的CSI信息、 与所述相邻时间的CSI信息对应的信道检测时的RSSI信息以及当前所述信道检测时的RSSI信息确定所述当前CSI信息；或当所述相邻时间的CSI信息为下行信道繁忙状态的CSI信息时，根据所述基站所属的小区的RSRP信息与当前所述信道检测时的RSSI信息确定所述当前CSI信息。
在该技术方案中，在接收到终端最新测量并反馈的CSI之前，基站可以通过以下几种方法获得当前CSI信息(可替代的CSI信息)，包括：采用基站存储的终端反馈的相邻时间的CSI信息(最近一次的CSI信息)，或者采用基站所属的小区的RRM(Radio resource management，无线资源管理)测量结果、与该小区相邻的其他小区的RRM测量结果以及相邻的其他小区的信道繁忙或开关状态确定当前CSI信息，比如当前CSI信息＝当前小区(基站所属的小区)的RSRP(Reference signal receiving power，参考信号接收功率)/(当前小区的RSRP+周围较强的处于开状态的小区的RSRP)；如此，可以使基站能偶选择更合适的调制编码方式，或者采用最低的调制编码方式。
其中，采用基站存储的终端反馈的相邻时间的CSI信息作为当前CSI信息具体包括：若最近的一次相隔时间较短，而且也是下行信道空闲状态的CSI信息；若最近的一次相隔时间较短，而且是下行信道繁忙状态的CSI信息，则根据相邻的CSI信息(旧的CSI信息)以及与之对应的信道检测时的RSSI(Received signal strength indication，接收的信号强度指示)信息，结合当前信道检测时的RSSI信息(新的RSSI信息)(当前信道检测时的RSSI信息可以是终端在检测到信道空闲时，将检测到的RSSI量化为一个值，并将此值在告知基站终端的检测结果为空闲时，同时告知给基站，此时，需要将不同的RSSI量化为不同的值的对应表格定义出来，如下表所示，表中threshold1即为信道忙闲的参数，如果大于该参数，则表示信道空闲，且threshold 1<threshold 2<threshold 3)确定当前CSI信息，比如，当前CSI信息＝(新的RSSI/旧的RSSI)*旧的CSI，或者采用基站所属的小区的RSRP信息和当前信道检测时的RSSI信息确定当前CSI信息，比如当前CSI信息＝基站所属的小区的RSRP/新的RSSI。
Figure PCTCN2015077995-appb-000001
Figure PCTCN2015077995-appb-000002
图9示出了根据本发明的实施例的LTE系统在非授权频段工作时的CSI测量及反馈系统的结构示意图。
如图9所示，根据本发明的实施例的LTE系统在非授权频段工作时的CSI测量及反馈系统900，用于基站侧，包括：控制单元902，用于当有下行业务到达时，控制检测当前下行信道状态，并控制根据所述当前下行信道状态向终端发送对应于所述当前下行信道状态的CSI测量配置信令和CSI反馈配置信令，或用于当有下行业务到达时，控制向终端发送对应于指定下行信道状态的CSI测量配置信令和CSI反馈配置信令，以使所述终端在获知下行信道状态后根据所述下行信道状态对应的CSI测量配置信令和CSI反馈配置信令进行CSI测量及CSI反馈。
在该技术方案中，当有下行业务到达，并在已知下行信道状态时，将与当前下行信道状态对应的CSI测量和CSI反馈配置信令发送至终端，或者，在未知下行信道状态时，将与指定下行信道状态对应的CSI测量和CSI反馈配置信令发送至终端，以使终端在获知下行信道状态后根据对应的CSI测量和CSI反馈配置信令进行CSI测量和CSI检测，如此，可以有效地确保LTE系统在非授权频段上引入LBT机制后CSI测量和CSI反馈的正常进行，进而保证频谱效率和信道使用率；其中，指定下行信道状态包括：下行信道繁忙状态或下行信道空闲状态。
在上述技术方案中，优选地，还包括：设置单元904，用于在发送对应于所述当前下行信道状态的CSI测量配置信令和CSI反馈配置信令或对应于指定下行信道状态的CSI测量配置信令和CSI反馈配置信令之前，设 置分别对应于下行信道繁忙状态和下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令。
在上述技术方案中，优选地，所述设置单元904具体用于：设置对应于所述下行信道繁忙状态的CSI测量配置信令和CSI反馈配置信令的配置内容具体包括：第一指示所述终端用于CSI测量的信号、第一CSI测量时间和频率位置、第一CSI测量周期、第一CSI反馈时间和第一CSI反馈周期；以及设置对应于所述下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令的配置内容具体包括：第二指示所述终端用于CSI测量的信号、第二CSI测量时间和频率位置、第二CSI测量周期、第二CSI反馈时间和第二CSI反馈周期。
在该技术方案中，通过设置与下行信道状态(下行信道繁忙和下行信道空闲)对应的CSI测量配置信令和CSI反馈配置信令，以及与下行信道繁忙状态对应的CSI测量配置信令和CSI反馈配置信令的配置内容包括但不限于：第一指示所述终端用于CSI测量的信号(用于CSI测量的信号)、第一CSI测量时间和频率位置、第一CSI测量周期、第一CSI反馈时间和第一CSI反馈周期，与下行信道空闲状态对应的CSI测量配置信令和CSI反馈配置信令的配置内容包括但不限于：第二指示所述终端用于CSI测量的信号(用于CSI测量的信号)、第二CSI测量时间和频率位置、第二CSI测量周期、第二CSI反馈时间和第二CSI反馈周期，通过将下行信道状态与CSI测量和反馈信令对应，并配置相应的主要内容，以明确地指示当下行信道状态不同时，是否需要测量及反馈CSI，以及具体基于哪些信息进行CSI测量和反馈，进而有效地确保LTE系统在非授权频段上引入LBT机制后CSI测量和CSI反馈的正常进行。
在上述技术方案中，优选地，所述设置单元904具体还用于：设置所述第一指示所述终端用于CSI测量的信号包括以下之一或其组合：按第一周期发送的PSS/SSS信号、按第二周期发送的CRS信号、按第三周期发送的CSI-RS信号和按第四周期发送的DRS信号；设置所述第一CSI测量时间和频率位置为所述第一指示所述终端用于CSI测量的信号的发送时间和频率位置；设置所述第一CSI测量周期大于或等于所述第一周期、所述第 二周期、所述第三周期和所述第四周期中最大的一个周期；设置所述第一CSI反馈周期大于或等于所述第一CSI测量周期；以及设置所述第二指示所述终端用于CSI测量的信号包括以下之一或其组合：按第五周期发送的PSS/SSS信号、按第六周期发送的CRS信号、按第七周期发送的CSI-RS信号和按第八周期发送的DRS信号；设置所述第二CSI测量时间和频率位置为所述第二CSI测量配置信令提供的指示所述终端用于CSI测量的子帧号和子载波位置；设置所述第二CSI测量周期大于或等于所述第五周期、所述第六周期、所述第七周期和所述第八周期中最大的一个周期；设置所述第二CSI反馈周期大于或等于所述第二CSI测量周期，其中，所述第五周期小于或等于所述第一周期、所述第六周期小于或等于所述第二周期、所述第七周期小于或等于所述第三周期、所述第八周期小于或等于所述第四周期，所述第二CSI测量周期小于所述第一CSI测量周期，所述第二CSI反馈周期小于或等于第一CSI反馈周期，以及设置所述第一CSI反馈时间和所述第二CSI反馈时间包括：在检测到上行信道空闲时反馈，或在所述CSI测量结束后直接反馈。
在上述技术方案中，优选地，所述设置单元904具体还用于：设置对应于所述下行信道繁忙状态和所述下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令的配置内容具体包括：非周期性进行所述CSI测量和所述CSI反馈。
在该技术方案中，与下行信道繁忙状态对应的第一指示终端用于CSI测量的信号包括但不限于以下之一或其组合：按第一周期(大周期)发送的PSS按第一周期发送的PSS/SSS(Primary Synchronization Signal，主同步信号/Secondary Synchronization Signal，辅同步信号)信号、按第二周期(大周期)发送的CRS(Common Reference Signal，公共参考信号)信号、按第三周期(大周期)发送的CSI-RS(Channel State Information-Reference Signal，信道状态信息参考信号)信号和按第四周期(大周期)发送的DRS(Discovery Reference Signal，发现参考信号)信号，以及与下行信道空闲状态对应的第二指示终端用于CSI测量的信号包括但不限于以下之一或其组合：按第五周期(小周期)发送的PSS/SSS信号、按第六周期(小周期) 发送的CRS信号、按第七周期(小周期)发送的CSI-RS信号和按第八周期(小周期)发送的DRS信号，其中，第一周期、第二周期、第三周期和第四周期不完全相同，第五周期、第六周期、第七周期和第八周期不完全相同，且第五周期、第六周期、第七周期和第八周期相应地分别小于或等于第一周期、第二周期、第三周期和第四周期，即可以通过多种方式告知终端进行CSI测量和CSI反馈；而下行信道繁忙状态和下行信道空闲状态对应的CSI测量和反馈的开始时间(第一CSI测量时间和频率位置及第二CSI测量时间和频率位置)分别为指示终端用于CSI测量的信号的发送时间以及信令中给出的用于CSI测量的子帧号和子载波位置；与下行信道繁忙或下行空闲状态对应的CSI反馈周期大于CSI测量周期，而CSI测量周期分别大于或等于第一周期、第二周期、第三周期和第四周期中最大的一个周期值以及第五周期、第六周期、第七周期和第八周期中最大的一个周期值；以及可以在检测到上行信道空闲或信道状态不确定的情况进行CSI反馈，即可以任意设置CSI反馈时间；当然，也可以非周期性地进行CSI测量和CSI反馈，当信道状态为已知或未知时，通过对应地明确基于哪些信号可以进行CSI测量及反馈，并明确CSI测量和反馈的时间和周期，进而有效地确保LTE系统在非授权频段上引入LBT机制后CSI测量和CSI反馈的正常进行。
在上述技术方案中，优选地，所述控制单元902具体用于：控制在所述非授权频段或授权频段上发送对应于所述下行信道繁忙状态和所述下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令以及CSI反馈信息。
在该技术方案中，可以将与不同的下行信道状态对应的CSI测量配置信令和CSI反馈配置信令以及终端进行CSI测量后需要反馈的CSI信息在非授权频段或授权频段上进行发送，以提高频谱效率和信道使用率。
在上述技术方案中，优选地，所述控制单元902具体还用于：当在所述非授权频段上以固定的周期重复进行信道检测时，控制通过RRC信令的方式直接向所述终端发送对应于所述下行信道繁忙状态或所述下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令；或当接收到所述下行业务，并在所述非授权频段上进行下行信道检测并在检测到所述下行信道空 闲时，控制根据所述下行信道空闲的开始时间和终止时间确定所述CSI测量时间和频率位置，并通过RRC信令、MAC信令和/或DCI信令的方式向所述终端发送对应于所述下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令。
在该技术方案中，当在非授权频段上以固定的周期重复进行下行信道检测(基于FBE(Framed based equipment)的LBT机制)时，即信道检测时间是周期性重复出现的，此时CSI测量时间和频率位置，比如子帧号比较容易指示给终端，即通过直接RRC(Radio Resource Connection，无线资源连接)信令一次就能指示清楚，而后每次不管检测到信道忙闲都能依照此次的RRC信令指示的子帧号等进行测量并反馈；或者，当有下行业务到达，并在非授权频段上进行下行信道检测(基于LBE(Load based equipment)的LBT机制)，即信道检测时间非周期性出现，且在这种情况下没有信道繁忙时间，因为如果信道繁忙，就一直进行信道检测，那么只有信道检测时间和信道空闲时间，若检测到信道空闲时，此时，基站只能在每次检测到信道空闲之后，依照这次信道空闲的起始时间和终止时间设定一个CSI测量时间和频率位置，然后通过RRC信令，MAC(Medium access control，媒体接入控制)信令或者DCI(Downlink control indicator，下行控制指示)信令告知终端CSI测量时间和频率位置，如此，可以确保在不同的LBT机制下、不同信道状态时如何将CSI测量时间和频率位置告知给终端，进而确保LTE系统在非授权频段上引入LBT机制后CSI测量和CSI反馈的正常进行。
在上述技术方案中，优选地，所述控制单元902具体还用于：控制在信道检测时间后的相邻子帧发送对应于所述下行信道繁忙状态的CSI测量配置信令和CSI反馈配置信令；或当检测到所述下行信道空闲时，控制向所述终端发送信道空闲指示，以使所述终端收到所述信道空闲指示后根据接收到的对应于所述下行信道空闲状态的CSI测量配置信令、CSI反馈配置信令进行所述CSI测量及所述CSI反馈。
在该技术方案中，当不管下行信道忙闲都要测量CSI时，基站可以在信道检测时间之后相邻的子帧发送用于测量CSI的信号，而终端可以在信 道检测时间之后相邻的子帧测量CSI并进行反馈(此种方法适用于基于FBE的LBT机制)；或者，当基站在做完下行信道检测并检测到下行信道空闲时，立马发送信道空闲指示，以使终端在收到信道空闲指示后，马上进行CSI测量，此时，基站在终端收到信道空闲指示后以及能够进行CSI测量所需的时间之后发送用于CSI测量的信号，也就是使终端正好收到信道空闲指示后，可以使进行CSI测量时的信号也在发送(此种方法适用于基于FBE和LBE的LBT机制)；如此，可以实现在合适的子帧发送指示终端用于CSI测量的信号，以有效地减少当基站检测到信道空闲之后而终端测量并反馈CSI这段时间内的时延，使终端可以尽早地测量并反馈CSI，进而提高频谱效率和信道使用率。
在上述技术方案中，优选地，所述控制单元902还用于：在接收到所述CSI反馈之前，控制采用存储的所述终端反馈的相邻时间的CSI信息作为当前CSI信息，或者控制采用最低的调制编码方式，或者控制采用根据所述基站所属的小区的RRM测量结果、与所述小区相邻的其他小区的RRM测量结果以及所述相邻的其他小区的信道繁忙或开关状态确定的当前CSI信息；以及所述控制采用存储的所述终端反馈的相邻时间的CSI信息作为当前CSI信息具体包括：当所述相邻时间的CSI信息为信道繁忙状态的CSI信息时，控制根据所述相邻时间的CSI信息、与所述相邻时间的CSI信息对应的信道检测时的RSSI信息以及当前所述信道检测时的RSSI信息确定所述当前CSI信息；或当所述相邻时间的CSI信息为下行信道繁忙状态的CSI信息时，根据所述基站所属的小区的RSRP信息与当前所述信道检测时的RSSI信息确定所述当前CSI信息。
在该技术方案中，在接收到终端最新测量并反馈的CSI之前，基站可以通过以下几种方法获得当前CSI信息(可替代的CSI信息)，包括：采用基站存储的终端反馈的相邻时间的CSI信息(最近一次的CSI信息)，或者采用基站所属的小区的RRM(Radio resource management，无线资源管理)测量结果、与该小区相邻的其他小区的RRM测量结果以及相邻的其他小区的信道繁忙或开关状态确定当前CSI信息，比如当前CSI信息＝当前小区(基站所属的小区)的RSRP(Reference signal receiving power，参考 信号接收功率)/(当前小区的RSRP+周围较强的处于开状态的小区的RSRP)；如此，可以使基站能偶选择更合适的调制编码方式，或者采用最低的调制编码方式。
其中，采用基站存储的终端反馈的相邻时间的CSI信息作为当前CSI信息具体包括：若最近的一次相隔时间较短，而且也是下行信道空闲状态的CSI信息；若最近的一次相隔时间较短，而且是下行信道繁忙状态的CSI信息，则根据相邻的CSI信息(旧的CSI信息)以及与之对应的信道检测时的RSSI(Received signal strength indication，接收的信号强度指示)信息，结合当前信道检测时的RSSI信息(新的RSSI信息)(当前信道检测时的RSSI信息可以是终端在检测到信道空闲时，将检测到的RSSI量化为一个值，并将此值在告知基站终端的检测结果为空闲时，同时告知给基站，此时，需要将不同的RSSI量化为不同的值的对应表格定义出来，如下表所示，表中threshold1即为信道忙闲的参数，如果大于该参数，则表示信道空闲，且threshold 1<threshold 2<threshold 3)确定当前CSI信息，比如，当前CSI信息＝(新的RSSI/旧的RSSI)*旧的CSI，或者采用基站所属的小区的RSRP信息和当前信道检测时的RSSI信息确定当前CSI信息，比如当前CSI信息＝基站所属的小区的RSRP/新的RSSI。
Figure PCTCN2015077995-appb-000003
图10示出了根据本发明的实施例的基站的结构示意图。
如图10所示，根据本发明的实施例的基站1000，包括：如上任一项技术方案所述的LTE系统在非授权频段工作时的CSI测量及反馈系统900。
在该技术方案中，基站1000通过该LTE系统在非授权频段工作时的CSI测量及反馈系统900，当有下行业务到达，并在已知下行信道状态时，将与当前下行信道状态对应的CSI测量和CSI反馈配置信令发送至终端，或者，在未知下行信道状态时，将与指定下行信道状态对应的CSI测量和CSI反馈配置信令发送至终端，以使终端在获知下行信道状态后根据对应的CSI测量和CSI反馈配置信令进行CSI测量和CSI检测，如此，可以有效地确保LTE系统在非授权频段上引入LBT机制后CSI测量和CSI反馈的正常进行，同时确保在最新的CSI信息还未获得时能够获取可替代的CSI信息，从而使基站能够选择更合适的调制编码方式，进一步提高频谱效率和信道使用率。
本发明实施例还提供了一种基站，图11为本发明实施例中另一种基站的结构示意图，如图所示，所述基站可以包括：至少一个输出装置1103，至少一个处理器1101，例如CPU，存储器1104和至少一个总线1102，处理器1101可以结合图9所示的LTE系统在非授权频段工作时的CSI测量及反馈系统。
其中，上述总线1102用于连接上述输出装置1103、处理器1101和存储器1104。
其中，上述输出装置1103具体可为终端的通信接口，例如网络接口，网络接口可以包括标准的有线接口或者无线接口(如WI-FI接口)，具体用于发送对应于当前下行信道状态的CSI测量配置信令和CSI反馈配置信令，发送对应于指定下行信道状态的CSI测量配置信令和CSI反馈配置信令。
上述存储器1104可以是高速RAM存储器，也可为非不稳定的存储器(non-volatile memory)，例如磁盘存储器。上述存储器1104还用于存储一组程序代码，上述处理器1101用于调用存储器1104中存储的程序代码，执行如下操作：
当有下行业务到达时，检测当前下行信道状态，并根据所述当前下行信道状态通过所述输出装置向终端发送对应于所述当前下行信道状态的CSI测量配置信令和CSI反馈配置信令。或
当有下行业务到达时，通过所述输出装置1103向终端发送对应于指定下行信道状态的CSI测量配置信令和CSI反馈配置信令，以使所述终端在 获知下行信道状态后根据所述下行信道状态对应的CSI测量配置信令和CSI反馈配置信令进行CSI测量及CSI反馈。
在可选实施例中，在所述处理器1101发送对应于所述当前下行信道状态的CSI测量配置信令和CSI反馈配置信令或对应于指定下行信道状态的CSI测量配置信令和CSI反馈配置信令之前，还用于执行以下操作：
设置分别对应于下行信道繁忙状态和下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令。
在可选实施例中，对应于所述下行信道繁忙状态的CSI测量配置信令和CSI反馈配置信令的配置内容具体包括：第一指示所述终端用于CSI测量的信号、第一CSI测量时间和频率位置、第一CSI测量周期、第一CSI反馈时间和第一CSI反馈周期。以及
对应于所述下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令的配置内容具体包括：第二指示所述终端用于CSI测量的信号、第二CSI测量时间和频率位置、第二CSI测量周期、第二CSI反馈时间和第二CSI反馈周期。
在可选实施例中，所述第一指示所述终端用于CSI测量的信号包括以下之一或其组合：按第一周期发送的PSS/SSS信号、按第二周期发送的CRS信号、按第三周期发送的CSI-RS信号和按第四周期发送的DRS信号。
所述第一CSI测量时间和频率位置为所述第一指示所述终端用于CSI测量的信号的发送时间和频率位置。
所述第一CSI测量周期大于或等于所述第一周期、所述第二周期、所述第三周期和所述第四周期中最大的一个周期。
所述第一CSI反馈周期大于或等于所述第一CSI测量周期。以及
所述第二指示所述终端用于CSI测量的信号包括以下之一或其组合：按第五周期发送的PSS/SSS信号、按第六周期发送的CRS信号、按第七周期发送的CSI-RS信号和按第八周期发送的DRS信号。
所述第二CSI测量时间和频率位置为所述第二CSI测量配置信令提供的指示所述终端用于CSI测量的子帧号和子载波位置。
所述第二CSI测量周期大于或等于所述第五周期、所述第六周期、所 述第七周期和所述第八周期中最大的一个周期。
所述第二CSI反馈周期大于或等于所述第二CSI测量周期，其中，所述第五周期小于或等于所述第一周期、所述第六周期小于或等于所述第二周期、所述第七周期小于或等于所述第三周期、所述第八周期小于或等于所述第四周期，所述第二CSI测量周期小于或等于所述第一CSI测量周期，所述第二CSI反馈周期小于或等于第一CSI反馈周期。以及
所述第一CSI反馈时间和所述第二CSI反馈时间包括：在检测到上行信道空闲时反馈，或在所述CSI测量结束后直接反馈。
在可选实施例中，对应于所述下行信道繁忙状态和所述下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令的配置内容具体包括：非周期性进行所述CSI测量和所述CSI反馈。
在可选实施例中，所述处理器1101还用于执行以下操作：
在所述非授权频段或授权频段上发送对应于所述下行信道繁忙状态、所述下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令以及CSI反馈信息。
在可选实施例中，所述处理器1101还用于执行以下操作：
当在所述非授权频段上以固定的周期重复进行信道检测时，通过RRC信令的方式直接向所述终端发送对应于所述下行信道繁忙状态或所述下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令。或
当接收到所述下行业务，并在所述非授权频段上进行下行信道检测并在检测到所述下行信道空闲时，根据所述下行信道空闲的开始时间和终止时间确定所述CSI测量时间和频率位置，并通过RRC信令、MAC信令和/或DCI信令的方式向所述终端发送对应于所述下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令。
在可选实施例中，所述处理器1101还用于执行以下操作：
在信道检测时间后的相邻子帧发送对应于所述下行信道繁忙状态的CSI测量配置信令和CSI反馈配置信令；或
当检测到所述下行信道空闲时，向所述终端发送信道空闲指示，以使所述终端收到所述信道空闲指示后根据接收到的对应于所述下行信道空闲 状态的CSI测量配置信令和CSI反馈配置信令进行所述CSI测量及所述CSI反馈。
在可选实施例中，所述处理器1101还用于执行以下操作：
在接收到所述CSI反馈之前，采用存储的所述终端反馈的相邻时间的CSI信息作为当前CSI信息，或者采用最低的调制编码方式，或者采用根据所述基站所属的小区的RRM测量结果、与所述小区相邻的其他小区的RRM测量结果以及所述相邻的其他小区的信道繁忙或开关状态确定的当前CSI信息。以及
所述采用存储的所述终端反馈的相邻时间的CSI信息作为当前CSI信息具体包括：
当所述相邻时间的CSI信息为信道繁忙状态的CSI信息时，根据所述相邻时间的CSI信息、与所述相邻时间的CSI信息对应的信道检测时的RSSI信息以及当前所述信道检测时的RSSI信息确定所述当前CSI信息。或
当所述相邻时间的CSI信息为信道繁忙状态的CSI信息时，根据所述基站所属的小区的RSRP信息与当前所述信道检测时的RSSI信息确定所述当前CSI信息。
具体的，本发明实施例中介绍的终端可以用以实施本发明结合图4介绍的方法实施例中的部分或全部流程。
以上结合附图详细说明了本发明的技术方案，可以确保LTE系统在非授权频段上引入LBT机制后CSI测量和CSI反馈的正常进行，同时确保在最新的CSI信息还未获得时能够获取可替代的CSI信息，从而使基站能够选择更合适的调制编码方式，进一步提高频谱效率和信道使用率。
以上所述仅为本发明的优选实施例而已，并不用于限制本发明，对于本领域的技术人员来说，本发明可以有各种更改和变化。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (27)

  1. 一种LTE系统在非授权频段工作时的CSI测量及反馈方法，用于基站侧，其特征在于，包括：
    当有下行业务到达时，检测当前下行信道状态，并根据所述当前下行信道状态向终端发送对应于所述当前下行信道状态的CSI测量配置信令和CSI反馈配置信令；或
    当有下行业务到达时，向终端发送对应于指定下行信道状态的CSI测量配置信令和CSI反馈配置信令，以使所述终端在获知下行信道状态后根据所述下行信道状态对应的CSI测量配置信令和CSI反馈配置信令进行CSI测量及CSI反馈。
  2. 根据权利要求1所述的LTE系统在非授权频段工作时的CSI测量及反馈方法，其特征在于，在发送对应于所述当前下行信道状态的CSI测量配置信令和CSI反馈配置信令或对应于指定下行信道状态的CSI测量配置信令和CSI反馈配置信令之前，还包括：
    设置分别对应于下行信道繁忙状态和下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令。
  3. 根据权利要求2所述的LTE系统在非授权频段工作时的CSI测量及反馈方法，其特征在于，对应于所述下行信道繁忙状态的CSI测量配置信令和CSI反馈配置信令的配置内容具体包括：第一指示所述终端用于CSI测量的信号、第一CSI测量时间和频率位置、第一CSI测量周期、第一CSI反馈时间和第一CSI反馈周期；以及
    对应于所述下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令的配置内容具体包括：第二指示所述终端用于CSI测量的信号、第二CSI测量时间和频率位置、第二CSI测量周期、第二CSI反馈时间和第二CSI反馈周期。
  4. 根据权利要求3所述的LTE系统在非授权频段工作时的CSI测量及反馈方法，其特征在于，
    所述第一指示所述终端用于CSI测量的信号包括以下之一或其组合： 按第一周期发送的PSS/SSS信号、按第二周期发送的CRS信号、按第三周期发送的CSI-RS信号和按第四周期发送的DRS信号；
    所述第一CSI测量时间和频率位置为所述第一指示所述终端用于CSI测量的信号的发送时间和频率位置；
    所述第一CSI测量周期大于或等于所述第一周期、所述第二周期、所述第三周期和所述第四周期中最大的一个周期；
    所述第一CSI反馈周期大于或等于所述第一CSI测量周期；以及
    所述第二指示所述终端用于CSI测量的信号包括以下之一或其组合：按第五周期发送的PSS/SSS信号、按第六周期发送的CRS信号、按第七周期发送的CSI-RS信号和按第八周期发送的DRS信号；
    所述第二CSI测量时间和频率位置为所述第二CSI测量配置信令提供的指示所述终端用于CSI测量的子帧号和子载波位置；
    所述第二CSI测量周期大于或等于所述第五周期、所述第六周期、所述第七周期和所述第八周期中最大的一个周期；
    所述第二CSI反馈周期大于或等于所述第二CSI测量周期，其中，所述第五周期小于或等于所述第一周期、所述第六周期小于或等于所述第二周期、所述第七周期小于或等于所述第三周期、所述第八周期小于或等于所述第四周期，所述第二CSI测量周期小于或等于所述第一CSI测量周期，所述第二CSI反馈周期小于或等于第一CSI反馈周期，以及
    所述第一CSI反馈时间和所述第二CSI反馈时间包括：在检测到上行信道空闲时反馈，或在所述CSI测量结束后直接反馈。
  5. 根据权利要求2所述的LTE系统在非授权频段工作时的CSI测量及反馈方法，其特征在于，对应于所述下行信道繁忙状态和所述下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令的配置内容具体包括：非周期性进行所述CSI测量和所述CSI反馈。
  6. 根据权利要求2至5中任一项所述的LTE系统在非授权频段工作时的CSI测量及反馈方法，其特征在于，在所述非授权频段或授权频段上发送对应于所述下行信道繁忙状态、所述下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令以及CSI反馈信息。
  7. 根据权利要求2至5中任一项所述的LTE系统在非授权频段工作时的CSI测量及反馈方法，其特征在于，当在所述非授权频段上以固定的周期重复进行信道检测时，通过RRC信令的方式直接向所述终端发送对应于所述下行信道繁忙状态或所述下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令；或
    当接收到所述下行业务，并在所述非授权频段上进行下行信道检测并在检测到所述下行信道空闲时，根据所述下行信道空闲的开始时间和终止时间确定所述CSI测量时间和频率位置，并通过RRC信令、MAC信令和/或DCI信令的方式向所述终端发送对应于所述下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令。
  8. 根据权利要求7所述的LTE系统在非授权频段工作时的CSI测量及反馈方法，其特征在于，在信道检测时间后的相邻子帧发送对应于所述下行信道繁忙状态的CSI测量配置信令和CSI反馈配置信令；或
    当检测到所述下行信道空闲时，向所述终端发送信道空闲指示，以使所述终端收到所述信道空闲指示后根据接收到的对应于所述下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令进行所述CSI测量及所述CSI反馈。
  9. 根据权利要求8所述的LTE系统在非授权频段工作时的CSI测量及反馈方法，其特征在于，在接收到所述CSI反馈之前，采用存储的所述终端反馈的相邻时间的CSI信息作为当前CSI信息，或者采用最低的调制编码方式，或者采用根据所述基站所属的小区的RRM测量结果、与所述小区相邻的其他小区的RRM测量结果以及所述相邻的其他小区的信道繁忙或开关状态确定的当前CSI信息；以及
    所述采用存储的所述终端反馈的相邻时间的CSI信息作为当前CSI信息具体包括：
    当所述相邻时间的CSI信息为信道繁忙状态的CSI信息时，根据所述相邻时间的CSI信息、与所述相邻时间的CSI信息对应的信道检测时的RSSI信息以及当前所述信道检测时的RSSI信息确定所述当前CSI信息；或
    当所述相邻时间的CSI信息为信道繁忙状态的CSI信息时，根据所述基站所属的小区的RSRP信息与当前所述信道检测时的RSSI信息确定所述当前CSI信息。
  10. 一种LTE系统在非授权频段工作时的CSI测量及反馈系统，用于基站侧，其特征在于，包括：
    控制单元，用于当有下行业务到达时，控制检测当前下行信道状态，并控制根据所述当前下行信道状态向终端发送对应于所述当前下行信道状态的CSI测量配置信令和CSI反馈配置信令；或
    用于当有下行业务到达时，控制向终端发送对应于指定下行信道状态的CSI测量配置信令和CSI反馈配置信令，以使所述终端在获知下行信道状态后根据所述下行信道状态对应的CSI测量配置信令和CSI反馈配置信令进行CSI测量及CSI反馈。
  11. 根据权利要求10所述的LTE系统在非授权频段工作时的CSI测量及反馈系统，其特征在于，还包括：
    设置单元，用于在发送对应于所述当前下行信道状态的CSI测量配置信令和CSI反馈配置信令或对应于指定下行信道状态的CSI测量配置信令和CSI反馈配置信令之前，设置分别对应于下行信道繁忙状态和下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令。
  12. 根据权利要求11所述的LTE系统在非授权频段工作时的CSI测量及反馈系统，其特征在于，所述设置单元具体用于：
    设置对应于所述下行信道繁忙状态的CSI测量配置信令和CSI反馈配置信令的配置内容具体包括：第一指示所述终端用于CSI测量的信号、第一CSI测量时间和频率位置、第一CSI测量周期、第一CSI反馈时间和第一CSI反馈周期；以及
    设置对应于所述下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令的配置内容具体包括：第二指示所述终端用于CSI测量的信号、第二CSI测量时间和频率位置、第二CSI测量周期、第二CSI反馈时间和第二CSI反馈周期。
  13. 根据权利要求12所述的LTE系统在非授权频段工作时的CSI测 量及反馈系统，其特征在于，所述设置单元具体还用于：
    设置所述第一指示所述终端用于CSI测量的信号包括以下之一或其组合：按第一周期发送的PSS/SSS信号、按第二周期发送的CRS信号、按第三周期发送的CSI-RS信号和按第四周期发送的DRS信号；
    设置所述第一CSI测量时间和频率位置为所述第一指示所述终端用于CSI测量的信号的发送时间和频率位置；
    设置所述第一CSI测量周期大于或等于所述第一周期、所述第二周期、所述第三周期和所述第四周期中最大的一个周期；
    设置所述第一CSI反馈周期大于或等于所述第一CSI测量周期；以及
    设置所述第二指示所述终端用于CSI测量的信号包括以下之一或其组合：按第五周期发送的PSS/SSS信号、按第六周期发送的CRS信号、按第七周期发送的CSI-RS信号和按第八周期发送的DRS信号；
    设置所述第二CSI测量时间和频率位置为所述第二CSI测量配置信令提供的指示所述终端用于CSI测量的子帧号和子载波位置；
    设置所述第二CSI测量周期大于或等于所述第五周期、所述第六周期、所述第七周期和所述第八周期中最大的一个周期；
    设置所述第二CSI反馈周期大于或等于所述第二CSI测量周期，其中，所述第五周期小于或等于所述第一周期、所述第六周期小于或等于所述第二周期、所述第七周期小于或等于所述第三周期、所述第八周期小于或等于所述第四周期，所述第二CSI测量周期小于或等于所述第一CSI测量周期，所述第二CSI反馈周期小于或等于第一CSI反馈周期，以及
    设置所述第一CSI反馈时间和所述第二CSI反馈时间包括：在检测到上行信道空闲时反馈，或在所述CSI测量结束后直接反馈。
  14. 根据权利要求11所述的LTE系统在非授权频段工作时的CSI测量及反馈系统，其特征在于，所述设置单元具体还用于：
    设置对应于所述下行信道繁忙状态和所述下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令的配置内容具体包括：非周期性进行所述CSI测量和所述CSI反馈。
  15. 根据权利要求11至14中任一项所述的LTE系统在非授权频段工 作时的CSI测量及反馈系统，其特征在于，所述控制单元具体用于：
    控制在所述非授权频段或授权频段上发送对应于所述下行信道繁忙状态和所述下行信道空闲状态的CSI测量配置信令、CSI反馈配置信令以及CSI反馈信息。
  16. 根据权利要求11至14中任一项所述的LTE系统在非授权频段工作时的CSI测量及反馈系统，其特征在于，所述控制单元具体还用于：
    当在所述非授权频段上以固定的周期重复进行信道检测时，控制通过RRC信令的方式直接向所述终端发送对应于所述下行信道繁忙状态或所述下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令；或
    当接收到所述下行业务，并在所述非授权频段上进行下行信道检测并在检测到所述下行信道空闲时，控制根据所述下行信道空闲的开始时间和终止时间确定所述CSI测量时间和频率位置，并通过RRC信令、MAC信令和/或DCI信令的方式向所述终端发送对应于所述下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令。
  17. 根据权利要求16所述的LTE系统在非授权频段工作时的CSI测量及反馈系统，其特征在于，所述控制单元具体还用于：
    控制在信道检测时间后的相邻子帧发送对应于所述下行信道繁忙状态的CSI测量配置信令和CSI反馈配置信令；或
    当检测到所述下行信道空闲时，控制向所述终端发送信道空闲指示，以使所述终端收到所述信道空闲指示后根据接收到的对应于所述下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令进行所述CSI测量及所述CSI反馈。
  18. 根据权利要求17所述的LTE系统在非授权频段工作时的CSI测量及反馈系统，其特征在于，所述控制单元还用于：
    在接收到所述CSI反馈之前，控制采用存储的所述终端反馈的相邻时间的CSI信息作为当前CSI信息，或者控制采用最低的调制编码方式，或者控制采用根据所述基站所属的小区的RRM测量结果、与所述小区相邻的其他小区的RRM测量结果以及所述相邻的其他小区的信道繁忙或开关状态确定的当前CSI信息；以及
    所述控制采用存储的所述终端反馈的相邻时间的CSI信息作为当前CSI信息具体包括：
    当所述相邻时间的CSI信息为信道繁忙状态的CSI信息时，控制根据所述相邻时间的CSI信息、与所述相邻时间的CSI信息对应的信道检测时的RSSI信息以及当前所述信道检测时的RSSI信息确定所述当前CSI信息；或
    当所述相邻时间的CSI信息为信道繁忙状态的CSI信息时，根据所述基站所属的小区的RSRP信息与当前所述信道检测时的RSSI信息确定所述当前CSI信息。
  19. 一种基站，其特征在于，所述基站包括通信总线、输出装置、存储器以及处理器，其中：
    所述通信总线，用于实现所述输出装置、存储器以及处理器之间的连接通信；
    所述输出装置，用于发送对应于当前下行信道状态的CSI测量配置信令和CSI反馈配置信令，发送对应于指定下行信道状态的CSI测量配置信令和CSI反馈配置信令；
    所述存储器中存储一组程序代码，且处理器调用存储器中存储的程序代码，用于执行以下操作：
    当有下行业务到达时，检测当前下行信道状态，并根据所述当前下行信道状态通过所述输出装置向终端发送对应于所述当前下行信道状态的CSI测量配置信令和CSI反馈配置信令；或
    当有下行业务到达时，通过所述输出装置向终端发送对应于指定下行信道状态的CSI测量配置信令和CSI反馈配置信令，以使所述终端在获知下行信道状态后根据所述下行信道状态对应的CSI测量配置信令和CSI反馈配置信令进行CSI测量及CSI反馈。
  20. 根据权利要求19所述的基站，其特征在于，在所述处理器发送对应于所述当前下行信道状态的CSI测量配置信令和CSI反馈配置信令或对应于指定下行信道状态的CSI测量配置信令和CSI反馈配置信令之前，还用于执行以下操作：
    设置分别对应于下行信道繁忙状态和下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令。
  21. 根据权利要求20所述的基站，其特征在于，对应于所述下行信道繁忙状态的CSI测量配置信令和CSI反馈配置信令的配置内容具体包括：第一指示所述终端用于CSI测量的信号、第一CSI测量时间和频率位置、第一CSI测量周期、第一CSI反馈时间和第一CSI反馈周期；以及
    对应于所述下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令的配置内容具体包括：第二指示所述终端用于CSI测量的信号、第二CSI测量时间和频率位置、第二CSI测量周期、第二CSI反馈时间和第二CSI反馈周期。
  22. 根据权利要求21所述的基站，其特征在于，
    所述第一指示所述终端用于CSI测量的信号包括以下之一或其组合：按第一周期发送的PSS/SSS信号、按第二周期发送的CRS信号、按第三周期发送的CSI-RS信号和按第四周期发送的DRS信号；
    所述第一CSI测量时间和频率位置为所述第一指示所述终端用于CSI测量的信号的发送时间和频率位置；
    所述第一CSI测量周期大于或等于所述第一周期、所述第二周期、所述第三周期和所述第四周期中最大的一个周期；
    所述第一CSI反馈周期大于或等于所述第一CSI测量周期；以及
    所述第二指示所述终端用于CSI测量的信号包括以下之一或其组合：按第五周期发送的PSS/SSS信号、按第六周期发送的CRS信号、按第七周期发送的CSI-RS信号和按第八周期发送的DRS信号；
    所述第二CSI测量时间和频率位置为所述第二CSI测量配置信令提供的指示所述终端用于CSI测量的子帧号和子载波位置；
    所述第二CSI测量周期大于或等于所述第五周期、所述第六周期、所述第七周期和所述第八周期中最大的一个周期；
    所述第二CSI反馈周期大于或等于所述第二CSI测量周期，其中，所述第五周期小于或等于所述第一周期、所述第六周期小于或等于所述第二周期、所述第七周期小于或等于所述第三周期、所述第八周期小于或等于 所述第四周期，所述第二CSI测量周期小于或等于所述第一CSI测量周期，所述第二CSI反馈周期小于或等于第一CSI反馈周期，以及
    所述第一CSI反馈时间和所述第二CSI反馈时间包括：在检测到上行信道空闲时反馈，或在所述CSI测量结束后直接反馈。
  23. 根据权利要求20所述的基站，其特征在于，对应于所述下行信道繁忙状态和所述下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令的配置内容具体包括：非周期性进行所述CSI测量和所述CSI反馈。
  24. 根据权利要求20至23中任一项所述的基站，其特征在于，所述处理器还用于执行以下操作：
    在所述非授权频段或授权频段上发送对应于所述下行信道繁忙状态、所述下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令以及CSI反馈信息。
  25. 根据权利要求20至23中任一项所述的基站，其特征在于，所述处理器还用于执行以下操作：
    当在所述非授权频段上以固定的周期重复进行信道检测时，通过RRC信令的方式直接向所述终端发送对应于所述下行信道繁忙状态或所述下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令；或
    当接收到所述下行业务，并在所述非授权频段上进行下行信道检测并在检测到所述下行信道空闲时，根据所述下行信道空闲的开始时间和终止时间确定所述CSI测量时间和频率位置，并通过RRC信令、MAC信令和/或DCI信令的方式向所述终端发送对应于所述下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令。
  26. 根据权利要求25所述的基站，其特征在于，所述处理器还用于执行以下操作：
    在信道检测时间后的相邻子帧发送对应于所述下行信道繁忙状态的CSI测量配置信令和CSI反馈配置信令；或
    当检测到所述下行信道空闲时，向所述终端发送信道空闲指示，以使所述终端收到所述信道空闲指示后根据接收到的对应于所述下行信道空闲状态的CSI测量配置信令和CSI反馈配置信令进行所述CSI测量及所述CSI 反馈。
  27. 根据权利要求26所述的基站，其特征在于，所述处理器还用于执行以下操作：
    在接收到所述CSI反馈之前，采用存储的所述终端反馈的相邻时间的CSI信息作为当前CSI信息，或者采用最低的调制编码方式，或者采用根据所述基站所属的小区的RRM测量结果、与所述小区相邻的其他小区的RRM测量结果以及所述相邻的其他小区的信道繁忙或开关状态确定的当前CSI信息；以及
    所述采用存储的所述终端反馈的相邻时间的CSI信息作为当前CSI信息具体包括：
    当所述相邻时间的CSI信息为信道繁忙状态的CSI信息时，根据所述相邻时间的CSI信息、与所述相邻时间的CSI信息对应的信道检测时的RSSI信息以及当前所述信道检测时的RSSI信息确定所述当前CSI信息；或
    当所述相邻时间的CSI信息为信道繁忙状态的CSI信息时，根据所述基站所属的小区的RSRP信息与当前所述信道检测时的RSSI信息确定所述当前CSI信息。
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