CN105207738A - Channel parameter reporting method and apparatus, communication terminal, and base station - Google Patents

Abstract

The present invention provides a channel parameter reporting method, device, communication terminal and base station. The channel parameter reporting method is used for a communication terminal in an LTE system, including: receiving a reporting mode configuration message sent by a base station, and indicating the reporting mode configuration message The communication terminal does not report the precoding matrix index PMI; the channel parameters are determined by precoding according to the reference signal sent by the base station, and the channel parameters include the optimal rank index RI, PMI and the channel quality indicator CQI corresponding to the RI and PMI ; Reporting the CQI to the base station, so that the base station determines the modulation and coding strategy MCS, precoding matrix and rank number used during data transmission according to the CQI. By adopting the technical solution provided by the present invention, the UE calculates the CQI according to the precoding method, and at the same time, the UE does not need to report the PMI, thus avoiding the impact on the system performance caused by the difference between the CQI calculation method at the UE end and the data transmission method of the eNB, and reducing the signaling overhead, thereby improving system throughput.

Description

A channel parameter reporting method, device, communication terminal and base station

technical field

The present invention relates to the communication field, in particular to a method and device for reporting channel parameters, a communication terminal and a base station.

Background technique

In the current LTE system, there are 10 multi-antenna transmission modes (transmission mode, TM) in the downlink. Among them, TM7, TM8, TM9, and TM10 can perform beamforming transmission based on the channel reciprocity of the TDD system. In addition, TM8, TM9, and TM10 Precoding-based data transmission is also possible. Figure 1 is a schematic flow chart of the reporting method of channel parameters in the beamforming transmission scheme based on the channel mutuality of the TDD system. As shown in the figure, the reporting method includes:

Step S100, the base station eNB configures that the UE does not need to report PMI and RI;

Step S102, the UE selects the optimal RI and PMI in a transmission diversity manner according to the downlink CRS or CSI-RS sent by the eNB, and calculates the corresponding CQI;

Step S104, the UE feeds back the CQI to the eNB, and the UE may feed back the CQI to the eNB periodically or aperiodically;

In step S106, the eNB determines the MCS used for data transmission according to the CQI reported by the UE, estimates the downlink channel according to the uplink SRS sent by the UE, and calculates the precoding matrix and rank number.

Figure 2 is a schematic flow chart of a method for reporting channel parameters in a precoding-based data transmission scheme. As shown in the figure, the reporting method includes:

Step S200, the base station eNB configures the UE to report PMI and RI;

Step S202, according to the downlink CRS or CSI-RS sent by the eNB, the UE selects the optimal RI and PMI by means of closed-loop spatial multiplexing, and calculates the corresponding CQI;

Step S204, the UE feeds back CQI, PMI and RI to the eNB, and the UE may feed back to the eNB periodically or aperiodically;

In step S206, the eNB determines the MCS, rank number and precoding matrix used in data transmission according to the CQI, PMI and RI reported by the UE.

In the existing beamforming transmission scheme based on channel heterogeneity of the TDD system, the communication terminal UE calculates CQI (ChannelQualityIndicator, channel quality indicator) according to transmitdiversity (transmission diversity), and the base station eNB will use precoding in actual transmission Technology, through the uplink SRS (Sounding Reference Signal, channel sounding reference signal) to estimate the downlink channel to calculate the precoding matrix to improve the receiving performance, which makes the UE's CQI calculation method different from the eNB's actual data transmission method. This difference usually leads to the eNB in the actual The MCS (Modulation and Coding Scheme, modulation and coding strategy) used when transmitting data is low, thereby reducing the system throughput, especially in the case of using large-scale antennas, it is necessary to virtualize multiple physical antenna ports to send CRS (Common Reference Signal, Common reference signal) or CSI-RS (ChannelStateIndicationReferenceSignal, channel state indication reference signal), virtualization will reduce the transmit power of the antenna port, which will further reduce the accuracy of CQI calculation.

However, in the precoding-based data transmission scheme, the UE needs to report PMI (PrecodingMatrix Indicator, the number of rows and columns of the precoding matrix) periodically or aperiodically, and there is a certain signaling overhead.

Contents of the invention

In order to solve the above technical problems, the present invention provides a channel parameter reporting method, device, communication terminal and base station. The UE calculates the CQI according to the precoding method, and at the same time, the UE does not need to report the PMI, thereby avoiding the CQI calculation method at the UE side and the eNB. The impact of different data transmission methods on system performance also reduces signaling overhead, thereby improving system throughput.

In order to achieve the above object, the present invention provides a method for reporting channel parameters, which is used for a communication terminal in an LTE system. The reporting method includes: a first receiving step: receiving a reporting mode configuration message sent by a base station, and the reporting mode The configuration message indicates that the communication terminal does not report the precoding matrix index PMI; the calculation step: according to the reference signal issued by the base station, the channel parameters are determined by precoding, and the channel parameters include the optimal rank index RI, PMI and the relationship between the RI and PMI Corresponding channel quality indicator CQI; reporting step: report the CQI to the base station, so that the base station determines the modulation and coding strategy MCS, precoding matrix and rank number used during data transmission according to the CQI.

The above method for reporting channel parameters, wherein the reporting mode configuration message further instructs the communication terminal to report RI to the base station; the reporting step further reports the CQI and the RI to the base station, so that the The base station determines the MCS, precoding matrix and rank number used in data transmission according to the CQI and the RI.

In the above method for reporting channel parameters, the precoding method is a closed-loop spatial multiplexing method.

The present invention also provides a method for reporting channel parameters, which is used for a base station in an LTE system. The reporting method includes: a sending step: sending a reporting mode configuration message to the communication terminal, and the reporting mode configuration message indicates that the communication terminal does not report The precoding matrix index PMI; the second receiving step: receiving the CQI sent by the communication terminal, the CQI is obtained by the communication terminal using precoding; the determining step: determining the CQI used when transmitting data to the communication terminal according to the CQI Modulation and coding strategy MCS, precoding matrix and rank number.

The above method for reporting channel parameters, wherein, the reporting mode configuration message also instructs the communication terminal to report RI to the base station; the second receiving step further receives RI; the determining step further determines according to the CQI and RI The MCS, precoding matrix and rank number used by the communication terminal when transmitting data.

The present invention also provides a channel parameter reporting device, which is used for a communication terminal in an LTE system. The reporting device includes: a first receiving module, used to receive a reporting mode configuration message sent by a base station, and the reporting mode configuration message Instruct the communication terminal not to report the precoding matrix index PMI; the calculation module is used to determine the channel parameters by using the precoding method according to the reference signal issued by the base station, and the channel parameters include the optimal rank index RI, PMI and the relationship between the RI and PMI Corresponding channel quality indicator CQI; a reporting module, configured to report the CQI to the base station, so that the base station determines the modulation and coding strategy MCS, precoding matrix and rank number used during data transmission according to the CQI.

The above channel parameter reporting device, wherein the reporting mode configuration message further instructs the communication terminal to report RI to the base station; the reporting module is further configured to report the CQI and the RI to the base station, to making the base station determine the MCS, precoding matrix and rank number used during data transmission according to the CQI and the RI.

In the above device for reporting channel parameters, the precoding method is a closed-loop spatial multiplexing method.

The present invention also provides a communication terminal, including the above-mentioned device for reporting channel parameters.

The present invention also provides a channel parameter reporting device, which is used in a base station in an LTE system. The reporting device includes: a sending module, used to send a reporting mode configuration message to a communication terminal, and the reporting mode configuration message indicates the communication terminal The precoding matrix index PMI is not reported; the second receiving module is used to receive the CQI sent by the communication terminal, and the CQI is obtained by the communication terminal using precoding; Modulation and coding strategy MCS, precoding matrix and rank number adopted by the terminal when transmitting data.

The above channel parameter reporting device, wherein the reporting mode configuration message also instructs the communication terminal to report RI to the base station; the second receiving module further receives RI; the determining module is further configured to Determine the MCS, precoding matrix and rank number used when transmitting data to the communication terminal.

The present invention also provides a base station, including the above-mentioned device for reporting channel parameters.

The beneficial effects of above-mentioned technical scheme of the present invention are as follows:

The present invention provides a channel parameter reporting method, device, communication terminal and base station. The UE calculates the CQI according to the precoding method, and at the same time, the UE does not need to report the PMI, thereby avoiding the system due to the difference between the CQI calculation method at the UE end and the eNB data transmission method. The impact caused by the performance reduces the signaling overhead, thereby improving the system throughput.

Description of drawings

FIG. 1 is a schematic flowchart of a method for reporting channel parameters in a beamforming transmission scheme based on channel mutuality in a TDD system.

Fig. 2 is a schematic flowchart of a method for reporting channel parameters in a precoding-based data transmission scheme.

FIG. 3 is a schematic flowchart of a method for reporting channel parameters provided at the communication terminal side according to Embodiment 1 of the present invention.

FIG. 4 is a schematic flowchart of a method for reporting channel parameters provided at the base station side according to Embodiment 1 of the present invention.

FIG. 5 is a schematic flowchart of a channel parameter reporting method provided by Embodiment 2 of the present invention.

FIG. 6 is a schematic flowchart of a method for reporting channel parameters provided by Embodiment 3 of the present invention.

Detailed ways

In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will describe in detail with reference to the drawings and specific embodiments.

The embodiment of the present invention aims at the problem of the impact on the system performance due to the difference between the CQI calculation method of the UE end and the data transmission method of the eNB in the beamforming transmission scheme based on the channel heterogeneity of the TDD system in the prior art, and provides a The channel parameter reporting method, device, communication terminal and base station, the UE calculates the CQI according to the precoding method, and at the same time, the UE does not need to report the PMI, thereby avoiding the impact on system performance due to the difference between the CQI calculation method at the UE end and the data transmission method of the eNB, and Signaling overhead is reduced, thereby improving system throughput.

FIG. 3 is a schematic flow chart of a channel parameter reporting method provided in Embodiment 1 of the present invention. The reporting method is used for a communication terminal in an LTE system. As shown in the figure, the reporting method includes:

Step S300, receiving a reporting mode configuration message sent by the base station, the reporting mode configuration message instructing the communication terminal not to report the precoding matrix index PMI;

Step S302, using a precoding method to determine channel parameters according to the reference signal issued by the base station, the channel parameters including the optimal rank index RI, PMI and the channel quality indicator CQI corresponding to the RI and PMI;

Step S304, reporting the CQI to the base station, so that the base station determines the modulation and coding strategy MCS, precoding matrix and rank number used during data transmission according to the CQI.

On the base station side, as shown in FIG. 4, the above method for reporting channel parameters specifically includes:

Step S400, sending a reporting mode configuration message to the communication terminal, the reporting mode configuration message instructing the communication terminal not to report the precoding matrix index PMI;

Step S402, receiving the CQI sent by the communication terminal, where the CQI is obtained by the communication terminal using a precoding method;

Step S404, determining a modulation and coding strategy MCS, a precoding matrix, and a rank number used when transmitting data to the communication terminal according to the CQI.

In the method for reporting channel parameters provided by the present invention, the base station will send a report mode configuration message to the communication terminal to notify the communication terminal not to report the PMI, and the communication terminal will determine the channel parameters after receiving the report mode configuration message. The precoding method is determined, thereby avoiding the impact on system performance caused by the difference between the CQI calculation method at the UE end and the data transmission method of the eNB, wherein the channel parameters include: the optimal RI and PMI and the CQI corresponding to the RI and PMI , when reporting channel parameters to the base station, according to the reporting mode configuration message issued by the base station, the communication terminal reports the CQI to the base station instead of reporting the PMI to the base station, thereby reducing signaling overhead and improving system throughput.

Wherein, the communication terminal determines the channel parameters in a precoding manner according to the uplink common reference signal CRS or the channel state indication reference signal CSI-RS issued by the base station.

After receiving the CQI reported by the communication terminal, the base station determines the MCS used for data transmission according to the CQI, estimates the downlink channel according to the upper and lower SRS sent by the communication terminal, and uses the EBB (EigenvalueBasedBeamforming, eigenvector) algorithm or other methods according to the downlink channel. A low-complexity algorithm calculates the precoding matrix and the rank number. When the base station calculates the rank number according to the downlink channel, resources of the base station will be consumed, and since the communication terminal does not generate too much signaling overhead when transmitting RI, the above method for reporting channel parameters, wherein the reporting mode The configuration message also instructs the communication terminal to report RI to the base station; the reporting step further reports the CQI and the RI to the base station, so that the base station determines data transmission according to the CQI and the RI The MCS, precoding matrix, and rank number used at the time.

The purpose of the above operations is to report the RI to the base station together, and the base station can directly determine the rank number according to the RI without calculation by the base station.

In the above method for reporting channel parameters, the precoding method is a closed-loop spatial multiplexing method.

In the channel parameter reporting method provided by the present invention, the base station updates Table 7.2.1-1 in order to configure the reporting mode of the communication terminal, that is, to realize that the communication terminal does not report the PMI and reports the RI. For aperiodic reporting, The updated Table 7.2.1-1 is shown in Table 1 below. Compared with the existing table, the updated Table 7.2.1-1 adds a column "NoPMIButwithRI", which is used to configure the communication terminal to report the PMI instead of RI, and configure the appropriate transmission mode at the same time:

TM7: Modes2-0,3-0forR8～R11UE; Modes2-3,3-3forR12andlaterUE

TM8: Modes1-2,2-2,3-1iftheUEisconfiguredwithPMI/RIreporting; modes2-0,3-0iftheUEisconfiguredwithoutPMI/RIreportingforR8～R11UE; modes2-3,3-3iftheUEisconfiguredwithoutPMI/RIreportingforR12andlaterUE

TM9: Modes1-2,2-2,3-1iftheUEisconfiguredwithPMI/RIreportingornumberofCSI-RSports>1; modes2-0,3-0iftheUEisconfiguredwithoutPMI/RIreportingornumberofCSI-RSports＝1forR8～R11UE;

TM10: Modes1-2,2-2,3-1iftheUEisconfiguredwithPMI/RIreportingornumberofCSI-RSports>1; modes2-0,3-0iftheUEisconfiguredwithoutPMI/RIreportingornumberofCSI-RSports＝1forR8～R11UE; modes2-3,3-3iftheUEisconfiguredwithoutPMI/RIreportingornumberofCSI-RSports＝later1forCSI

Table 1

For periodic reporting, the updated Table 7.2.1-1 is shown in Table 2 below. Compared with the existing one, the updated Table 7.2.1-1 adds a column "NoPMIButwithRI" for configuring communication The terminal does not report PMI but reports RI, and at the same time configures the adaptive transmission mode:

TM7: Modes1-0,2-0forR8～R11UE; Modes1-2,2-2forR12andlaterUE

TM8: Modes1-1,2-1iftheUEisconfiguredwithPMI/RIreporting; modes1-0,2-0iftheUEisconfiguredwithoutPMI/RIreportingforR8～R11UE; modes1-2,2-2iftheUEisconfiguredwithoutPMI/RIreportingforR12andlaterUE

TM9: Modes1-1,2-1iftheUEisconfiguredwithPMI/RIreportingandnumberofCSI-RSports>1; modes1-0,2-0iftheUEisconfiguredwithoutPMI/RIreportingornumberofCSI-RSports＝1forR8～R11UE; modes1-0,2-0iftheUEisconfiguredwithoutPMI/RIreportingornumberof1forUE-RSports＝la

TM10: Modes1-1,2-1iftheUEisconfiguredwithPMI/RIreportingornumberofCSI-RSports>1; modes1-0,2-0iftheUEisconfiguredwithoutPMI/RIreportingornumberofCSI-RSports＝1forR8～R11UE; modes1-0,2-0iftheUEisconfiguredwithoutPMI/RIreportingornumberofCSI-RSports＝laUE

Table 2

Fig. 5 is a schematic flowchart of a channel parameter reporting method provided by Embodiment 2 of the present invention. As shown in the figure, the reporting method includes:

Step S500, the base station eNB configures that the UE does not need to report PMI and RI;

Step S502, according to the downlink CRS or CSI-RS sent by the eNB, the UE selects the optimal RI and PMI by means of closed-loop spatial multiplexing, and calculates the corresponding CQI;

Step S504, the UE feeds back the CQI to the eNB, and the UE may feed back the CQI to the eNB periodically or aperiodically;

In step S506, the eNB determines the MCS used for data transmission according to the CQI reported by the UE, estimates the downlink channel according to the uplink SRS sent by the UE, and calculates the precoding matrix and rank number through the EBB algorithm.

FIG. 6 is a schematic flowchart of a channel parameter reporting method provided in Embodiment 3 of the present invention. As shown in the figure, the reporting method includes:

Step S600, the base station eNB configures the UE not to report PMI and to report RI;

Step S602, according to the downlink CRS or CSI-RS sent by the eNB, the UE selects the optimal RI and PMI by means of closed-loop spatial multiplexing, and calculates the corresponding CQI;

Step S604, the UE feeds back the CQI and RI to the eNB, and the UE may feed back to the eNB periodically or aperiodically;

Step S606, the eNB determines the MCS used for data transmission according to the CQI reported by the UE, determines the rank number according to the RI, estimates the downlink channel according to the uplink SRS sent by the UE, and calculates the precoding matrix through the EBB algorithm.

The present invention also provides a channel parameter reporting device, which is used for a communication terminal in an LTE system. The reporting device includes: a first receiving module, used to receive a reporting mode configuration message sent by a base station, and the reporting mode configuration message Instruct the communication terminal not to report the precoding matrix index PMI; the calculation module is used to determine the channel parameters by using the precoding method according to the reference signal issued by the base station, and the channel parameters include the optimal rank index RI, PMI and the relationship between the RI and PMI Corresponding channel quality indicator CQI; a reporting module, configured to report the CQI to the base station, so that the base station determines the modulation and coding strategy MCS, precoding matrix and rank number used during data transmission according to the CQI.

The above channel parameter reporting device, wherein the reporting mode configuration message further instructs the communication terminal to report RI to the base station; the reporting module is further configured to report the CQI and the RI to the base station, to making the base station determine the MCS, precoding matrix and rank number used during data transmission according to the CQI and the RI.

In the above device for reporting channel parameters, the precoding method is a closed-loop spatial multiplexing method.

The present invention also provides a communication terminal, including the above-mentioned device for reporting channel parameters.

The present invention also provides a channel parameter reporting device, which is used in a base station in an LTE system. The reporting device includes: a sending module, used to send a reporting mode configuration message to a communication terminal, and the reporting mode configuration message indicates the communication terminal The precoding matrix index PMI is not reported; the second receiving module is used to receive the CQI sent by the communication terminal, and the CQI is obtained by the communication terminal using precoding; Modulation and coding strategy MCS, precoding matrix and rank number adopted by the terminal when transmitting data.

The above channel parameter reporting device, wherein the reporting mode configuration message also instructs the communication terminal to report RI to the base station; the second receiving module further receives RI; the determining module is further configured to Determine the MCS, precoding matrix and rank number used when transmitting data to the communication terminal.

The present invention also provides a base station, including the above-mentioned device for reporting channel parameters.

The above description is a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications can also be made. It should be regarded as the protection scope of the present invention.

Claims (12)

1. a channel parameter report method, is characterized in that, for the communication terminal in LTE system, described report method comprises:

First receiving step: receive base station send report mode configuration message, described in report mode configuration message indicate communication terminal do not report pre-coding matrix index PMI;

Calculation procedure: adopt precoding mode determination channel parameter according to the reference signal that base station issues, described channel parameter comprises optimal rank index RI, PMI and the channel quality indicator (CQI) corresponding with described RI and PMI;

Report step: described CQI is reported described base station, the modulation adopted when determining transfer of data to make described base station according to described CQI and coding strategy MCS, pre-coding matrix and rank number.

2. report method as claimed in claim 1, is characterized in that, described in report mode configuration message also to indicate described communication terminal to report RI to described base station;

Described CQI and described RI is reported described base station by the described step that reports further, the MCS, pre-coding matrix and the rank number that adopt when determining transfer of data to make described base station according to described CQI and described RI.

3. report method as claimed in claim 1, it is characterized in that, described precoding mode is Closed-Loop Spatial Multiplexing mode.

4. a channel parameter report method, is characterized in that, for the base station in LTE system, described report method comprises:

Forwarding step: to communication terminal send report mode configuration message, described in report mode configuration message indicate communication terminal do not report pre-coding matrix index PMI;

Second receiving step: receive the CQI that described communication terminal sends, described CQI is that communication terminal adopts precoding mode to obtain;

Determining step: determine modulation to adopting during described communication terminal transmission data and coding strategy MCS, pre-coding matrix and rank number according to described CQI.

5. report method as claimed in claim 4, is characterized in that, described in report mode configuration message also to indicate described communication terminal to report RI to described base station;

Described second receiving step receives RI further;

Described determining step determines MCS, pre-coding matrix and the rank number to adopting during described communication terminal transmission data according to described CQI and RI further.

6. a channel parameter reporting device, is characterized in that, for the communication terminal in LTE system, described reporting device comprises:

First receiver module, for receive base station send report mode configuration message, described in report mode configuration message indicate communication terminal do not report pre-coding matrix index PMI;

Computing module, the reference signal for issuing according to base station adopts precoding mode determination channel parameter, and described channel parameter comprises optimal rank index RI, PMI and the channel quality indicator (CQI) corresponding with described RI and PMI;

Reporting module, for described CQI is reported described base station, the modulation adopted when determining transfer of data to make described base station according to described CQI and coding strategy MCS, pre-coding matrix and rank number.

7. reporting device as claimed in claim 6, is characterized in that, described in report mode configuration message also to indicate described communication terminal to report RI to described base station;

Described reporting module, is further used for described CQI and described RI to report described base station, the MCS, pre-coding matrix and the rank number that adopt when determining transfer of data to make described base station according to described CQI and described RI.

8. reporting device as claimed in claim 6, it is characterized in that, described precoding mode is Closed-Loop Spatial Multiplexing mode.

9. a communication terminal, is characterized in that, comprises any one channel parameter reporting device as described in claim 6-8.

10. a channel parameter reporting device, is characterized in that, for the base station in LTE system, described reporting device comprises:

Sending module, for communication terminal send report mode configuration message, described in report mode configuration message indicate communication terminal do not report pre-coding matrix index PMI;

Second receiver module, for receiving the CQI that described communication terminal sends, described CQI is that communication terminal adopts precoding mode to obtain;

Determination module, for determining modulation to adopting during described communication terminal transmission data and coding strategy MCS, pre-coding matrix and rank number according to described CQI.

11. reporting devices as claimed in claim 10, is characterized in that, described in report mode configuration message also to indicate described communication terminal to report RI to described base station;

Described second receiver module receives RI further;

Described determination module is further used for MCS, pre-coding matrix and the rank number of determining to adopting during described communication terminal transmission data according to described CQI and RI.

12. 1 kinds of base stations, is characterized in that, comprise the channel parameter reporting device as described in any one of claim 10-11.