CN105207738A - Channel parameter reporting method and apparatus, communication terminal, and base station - Google Patents
Channel parameter reporting method and apparatus, communication terminal, and base station Download PDFInfo
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Abstract
The invention provides a channel parameter reporting method and an apparatus, a communication terminal, and a base station. The channel parameter reporting method is used for a communication terminal in an LTE system and includes: a reporting mode configuration message sent by the base station is received, and the reporting mode configuration message indicates that the communication terminal does not report a pre-coding matrix index PMI; channel parameters are determined by employing a pre-cording mode according to reference signals sent by the base station, and the channel parameters comprise the optimal rank index RI, the PMI, and a channel quality indicator CQI corresponding to the RI and the PMI; and the CQI is reported to the base station so that the base station determines the modulation and coding scheme MCS, the pre-cording matrix, and the rank number employed during data transmission according to the CQI. According to the technical scheme, UE calculates the CQI according to a pre-coding mode, and the UE does not need to report the PMI so that the influence on the system performance due to the difference of the calculating method of the CQI at the UE terminal and the data transmission method of eNB is avoided, the cost of signaling is reduced, and the system throughput is increased.
Description
Technical field
The present invention relates to the communications field, particularly relate to a kind of channel parameter report method, device, communication terminal and base station.
Background technology
In current LTE system, descendingly have 10 kinds of multi-antenna transmission pattern (transmissionmode, TM), wherein TM7, TM8, TM9, TM10 can carry out the beamforming transmission based on TDD system channel heterogeneite, in addition, and TM8, TM9, TM10 can also carry out the transfer of data based on precoding.Fig. 1 is the report method schematic flow sheet of channel parameter in the beamforming transmission scheme based on TDD system channel heterogeneite, and as shown in the figure, this report method comprises:
Step S100, base station eNB configuration UE is without the need to reporting PMI and RI;
Descending CRS or CSI-RS that step S102, UE send according to eNB, adopts RI and PMI of transmission diversity way selection optimum, and calculates corresponding CQI;
Step S104, UE feed back CQI to eNB, and UE can periodically or aperiodically feed back to eNB;
The MCS that step S106, eNB adopt when determining transfer of data according to the CQI that UE reports, estimates down channel according to the uplink SRS that UE sends, and calculates pre-coding matrix and rank number.
Fig. 2 is the report method schematic flow sheet of channel parameter in the data transmission scheme based on precoding, and as shown in the figure, this report method comprises:
Step S200, base station eNB configuration UE reports PMI and RI;
Descending CRS or CSI-RS that step S202, UE send according to eNB, adopts RI and PMI of the way selection optimum of Closed-Loop Spatial Multiplexing, and calculates corresponding CQI;
Step S204, UE feed back CQI, PMI and RI to eNB, and UE can periodically or aperiodically feed back to eNB;
MCS, rank number that step S206, eNB adopt when determining transfer of data according to CQI, PMI and RI that UE reports and pre-coding matrix.
In the existing beamforming transmission scheme based on TDD system channel heterogeneite, communication terminal UE calculates CQI (ChannelQualityIndicator according to transmitdiversity (transmission diversity) mode, CQI), and base station eNB can use precoding technique when actual transmissions, by uplink SRS (SoundingReferenceSignal, Sounding Reference Signal) estimate that down channel calculates pre-coding matrix to improve receptivity, this makes the CQI account form of UE different from the data transfer mode of eNB reality, MCS (the ModulationandCodingScheme that this difference can cause eNB to use when actual transmissions data usually, modulation and coding strategy) on the low side, thus reduction throughput of system, particularly when adopting extensive antenna, multiple physical antenna port is needed to carry out virtually sending CRS (CommonReferenceSignal, public reference signal) or CSI-RS (ChannelStateIndicationReferenceSignal, channel status instruction reference signal), virtual meeting makes the transmitting power of antenna port reduce, the accuracy that CQI calculates can be reduced further.
And based in the data transmission scheme of precoding, UE needs periodically or the acyclic PMI (PrecodingMatrixIndicator, the ranks number of pre-coding matrix) that reports, there is certain signaling consumption.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of channel parameter report method, device, communication terminal and base station, UE calculates CQI according to precoding mode, report PMI without the need to UE simultaneously, thus the CQI account form impact that systematic function caused different from the data transfer mode of eNB avoided due to UE end, additionally reduce the expense of signaling, thus improve throughput of system.
To achieve these goals, the invention provides a kind of channel parameter report method, for the communication terminal in LTE system, described report method comprises: the 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.
Above-mentioned channel parameter report method, wherein, 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.
Above-mentioned channel parameter report method, wherein, described precoding mode is Closed-Loop Spatial Multiplexing mode.
Present invention also offers a kind of channel parameter report method, 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.
Above-mentioned channel parameter report method, wherein, 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.
Present invention also offers a kind of channel parameter reporting device, for the communication terminal in LTE system, described reporting device comprises: the 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.
Above-mentioned channel parameter reporting device, wherein, 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.
Above-mentioned channel parameter reporting device, wherein, described precoding mode is Closed-Loop Spatial Multiplexing mode.
Present invention also offers a kind of communication terminal, comprise above-mentioned channel parameter reporting device.
Present invention also offers a kind of channel parameter reporting device, 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.
Above-mentioned channel parameter reporting device, wherein, 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.
Present invention also offers a kind of base station, comprise above-mentioned channel parameter reporting device.
The beneficial effect of technique scheme of the present invention is as follows:
The invention provides a kind of channel parameter report method, device, communication terminal and base station, UE calculates CQI according to precoding mode, report PMI without the need to UE simultaneously, thus the CQI account form impact that systematic function caused different from the data transfer mode of eNB avoided due to UE end, additionally reduce the expense of signaling, thus improve throughput of system.
Accompanying drawing explanation
Fig. 1 is the report method schematic flow sheet of channel parameter in the beamforming transmission scheme based on TDD system channel heterogeneite.
Fig. 2 is the report method schematic flow sheet of channel parameter in the data transmission scheme based on precoding.
Fig. 3 is for the embodiment of the present invention 1 is at the channel parameter report method schematic flow sheet provided of communication terminal side.
Fig. 4 is for the embodiment of the present invention 1 is at the schematic flow sheet of the channel parameter report method provided of base station side.
The schematic flow sheet of the channel parameter report method that Fig. 5 provides for the embodiment of the present invention 2.
The schematic flow sheet of the channel parameter report method that Fig. 6 provides for the embodiment of the present invention 3.
Embodiment
For making the technical problem to be solved in the present invention, technical scheme and advantage clearly, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.
The embodiment of the present invention is in prior art, in beamforming transmission scheme based on TDD system channel heterogeneite, due to the CQI account form problem on impact that systematic function cause different from the data transfer mode of eNB of UE end, provide a kind of channel parameter report method, device, communication terminal and base station, UE calculates CQI according to precoding mode, report PMI without the need to UE simultaneously, thus the CQI account form impact that systematic function caused different from the data transfer mode of eNB avoided due to UE end, additionally reduce the expense of signaling, thus improve throughput of system.
The schematic flow sheet of the channel parameter report method that Fig. 3 provides for the embodiment of the present invention 1, this report method is used for the communication terminal in LTE system, and as shown in the figure, described report method comprises:
Step S300, 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;
Step S302, 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;
Step S304, reports described base station by described CQI, 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.
And in base station side, as shown in Figure 4, above-mentioned channel parameter report method specifically comprises:
Step S400, 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;
Step S402, receives the CQI that described communication terminal sends, and described CQI is that communication terminal adopts precoding mode to obtain;
Step S404, determines modulation to adopting during described communication terminal transmission data and coding strategy MCS, pre-coding matrix and rank number according to described CQI.
Channel parameter report method provided by the invention, base station can send one to communication terminal and report mode configuration message, for notifying that communication terminal does not report PMI, and communication terminal is after receiving this report mode configuration message, when determining channel parameter, the mode of precoding is adopted to determine, thus the CQI account form impact that systematic function caused different from the data transfer mode of eNB avoided due to UE end, wherein, channel parameter comprises: optimum RI and PMI and the CQI corresponding with described RI and PMI, when to base station reporting channel parameter, what issue according to base station reports mode configuration message, CQI is reported base station by communication terminal, and PMI can not be reported base station, thus decrease the expense of signaling, improve throughput of system.
Wherein, the up public reference signal CRS that communication terminal issues according to base station or channel status instruction reference signal CSI-RS, adopts precoding mode determination channel parameter.
Base station is after receiving the CQI that communication terminal reports, the MCS adopted when determining transfer of data according to this CQI, down channel is estimated according to the SRS up and down that communication terminal sends, and according to this down channel, pre-coding matrix and rank number is calculated by the algorithm of EBB (EigenvalueBasedBeamforming, characteristic vector) algorithm or other low complex degrees.Base station is when calculating rank number according to this down channel, the resource of base station can be consumed, and because communication terminal is when transmitting RI, too many signaling consumption can not be produced, therefore, above-mentioned channel parameter report method, wherein, 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.
The object of aforesaid operations is that RI is together reported base station, and base station can directly be determined rank number according to RI and calculate without the need to base station.
Above-mentioned channel parameter report method, wherein, described precoding mode is Closed-Loop Spatial Multiplexing mode.
Channel parameter report method provided by the invention, base station is in order to be configured the pattern that reports of communication terminal, namely in order to realize communication terminal to not reporting PMI and reporting RI, to the renewal that Table7.2.1-1 carries out, report for acyclic, table Table7.2.1-1 after renewal is as shown in table 1 below, this table Table7.2.1-1 after renewal is relative to existing, add row " NoPMIButwithRI ", do not report PMI but to report RI for configuration communication terminal, and the transmission mode adapted to be configured simultaneously:
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/RIreportingandnumberofCSI-RSports>1；modes2-0,3-0iftheUEisconfiguredwithoutPMI/RIreportingornumberofCSI-RSports＝1forR8～R11UE；modes2-3,3-3iftheUEisconfiguredwithoutPMI/RIreportingornumberofCSI-RSports＝1forR12andlaterUE
TM10:Modes1-2,2-2,3-1iftheUEisconfiguredwithPMI/RIreportingandnumberofCSI-RSports>1；modes2-0,3-0iftheUEisconfiguredwithoutPMI/RIreportingornumberofCSI-RSports＝1forR8～R11UE；modes2-3,3-3iftheUEisconfiguredwithoutPMI/RIreportingornumberofCSI-RSports＝1forR12andlaterUE.
Table 1
For periodically reporting, table Table7.2.1-1 after renewal is as shown in table 2 below, this table Table7.2.1-1 after renewal is relative to existing, add row " NoPMIButwithRI ", do not report PMI but to report RI for configuration communication terminal, and the transmission mode adapted to be configured simultaneously:
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/RIreportingornumberofCSI-RSports＝1forR12andlaterUE
TM10:Modes1-1,2-1iftheUEisconfiguredwithPMI/RIreportingandnumberofCSI-RSports>1；modes1-0,2-0iftheUEisconfiguredwithoutPMI/RIreportingornumberofCSI-RSports＝1forR8～R11UE；modes1-0,2-0iftheUEisconfiguredwithoutPMI/RIreportingornumberofCSI-RSports＝1forR12andlaterUE.
Table 2
The schematic flow sheet of the channel parameter report method that Fig. 5 provides for the embodiment of the present invention 2, as shown in the figure, described report method comprises:
Step S500, base station eNB configuration UE is without the need to reporting PMI and RI;
Descending CRS or CSI-RS that step S502, UE send according to eNB, adopts RI and PMI of the way selection optimum of Closed-Loop Spatial Multiplexing, and calculates corresponding CQI;
Step S504, UE feed back CQI to eNB, and UE can periodically or aperiodically feed back to eNB;
The MCS that step S506, eNB adopt when determining transfer of data according to the CQI that UE reports, estimates down channel according to the uplink SRS that UE sends, and calculates pre-coding matrix and rank number by EBB algorithm.
The schematic flow sheet of the channel parameter report method that Fig. 6 provides for the embodiment of the present invention 3, as shown in the figure, described report method comprises:
Step S600, base station eNB configuration UE does not report PMI and reports RI;
Descending CRS or CSI-RS that step S602, UE send according to eNB, adopts RI and PMI of the way selection optimum of Closed-Loop Spatial Multiplexing, and calculates corresponding CQI;
Step S604, UE feed back CQI and RI, UE to eNB and can periodically or aperiodically feed back to eNB;
The MCS that step S606, eNB adopt when determining transfer of data according to the CQI that UE reports, determines rank number according to RI, estimates down channel, and calculate pre-coding matrix by EBB algorithm according to the uplink SRS that UE sends.
Present invention also offers a kind of channel parameter reporting device, for the communication terminal in LTE system, described reporting device comprises: the 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.
Above-mentioned channel parameter reporting device, wherein, 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.
Above-mentioned channel parameter reporting device, wherein, described precoding mode is Closed-Loop Spatial Multiplexing mode.
Present invention also offers a kind of communication terminal, comprise above-mentioned channel parameter reporting device.
Present invention also offers a kind of channel parameter reporting device, 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.
Above-mentioned channel parameter reporting device, wherein, 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.
Present invention also offers a kind of base station, comprise above-mentioned channel parameter reporting device.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from principle of the present invention; can also make some improvements and modifications, these improvements and modifications also should be considered as 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.
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| WO2018171482A1 (en) * | 2017-03-24 | 2018-09-27 | 电信科学技术研究院有限公司 | Method for acquiring channel state information, terminal and network-side device |
| CN108631844A (en) * | 2017-03-24 | 2018-10-09 | 电信科学技术研究院 | A kind of method, terminal and network side equipment obtaining channel state information |
| CN108631844B (en) * | 2017-03-24 | 2021-05-18 | 电信科学技术研究院 | Method, terminal and network side equipment for acquiring channel state information |
| WO2020154832A1 (en) * | 2019-01-28 | 2020-08-06 | Qualcomm Incorporated | Hybrid channel state feedback |
| US11546029B2 (en) | 2019-01-28 | 2023-01-03 | Qualcomm Incorporated | Hybrid channel state feedback |
| CN111935350A (en) * | 2019-05-13 | 2020-11-13 | Oppo广东移动通信有限公司 | Automatic bus stop reporting method and related products |
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| CN105207738B (en) | 2018-08-10 |
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