CN107241129B - Method and device for calibrating narrow-band channel state information reference signal beam direction - Google Patents

Method and device for calibrating narrow-band channel state information reference signal beam direction Download PDF

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CN107241129B
CN107241129B CN201610185916.8A CN201610185916A CN107241129B CN 107241129 B CN107241129 B CN 107241129B CN 201610185916 A CN201610185916 A CN 201610185916A CN 107241129 B CN107241129 B CN 107241129B
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csi
aperiodic
narrowband
narrow
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CN107241129A (en
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孙鹏
周欢
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Beijing Xinwei Telecom Technology Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming

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Abstract

The invention discloses a method and a device for calibrating the beam direction of a narrowband channel state information reference signal, wherein the method comprises the following steps: receiving a narrowband channel state information reference signal CSI-RS and an aperiodic CSI-RS sent by a base station; respectively carrying out channel measurement according to the narrow-band CSI-RS and the aperiodic CSI-RS; determining Channel State Information (CSI) reported to the base station according to a channel measurement result and the type of the aperiodic CSI-RS; reporting the CSI to the base station so that the base station calibrates the beam direction of the narrow-band CSI-RS according to a preset rule when determining that the beam direction of the narrow-band CSI-RS needs to be calibrated according to the CSI, wherein the CSI comprises a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI) and a Rank Indicator (RI). The invention can improve the utilization rate of the reference signal resource of the narrow-band CSI-RS and flexibly adjust the wave beam direction of the narrow-band CSI-RS.

Description

Method and device for calibrating narrow-band channel state information reference signal beam direction
Technical Field
The invention relates to the technical field of communication, in particular to a method and a device for calibrating a narrow-band channel state information reference signal beam direction.
Background
A Long Term Evolution (LTE) system introduces two types of Channel State Information Reference signals (CSI-RS) in the R13 version, one is a non-precoded CSI-RS, realizes full cell coverage through a wide beam with the same width, and can be configured as Reference signals of a plurality of User Equipments (UEs) in a cell; and the other is beamforming CSI-RS, a plurality of antenna array elements are mapped into one CSI-RS port by using a beamforming mode to form narrow beams with a certain direction, and only the sub-area in a cell can be covered.
There are two implementation manners for beamforming CSI-RS, one is that one CSI process contains more than one CSI-RS resource, which is called Cell-specific Beamforming (BF) CSI-RS, and is an upgrade of a virtual sector. Each CSI-RS resource is a wide beam representing a virtual sector. And the UE measures a plurality of beam directions, selects an optimal beam from the beam directions, reports an optimal resource number, and reports CSI on the corresponding beam.
The other is that one CSI process includes one CSI-RS resource, called user-specific (UE-specific) BFCSI-RS (i.e. narrowband CSI-RS), for reducing the number of CSI-RS ports, improving coverage, and reducing complexity of measurement. Time Division Duplexing (TDD) may calculate and determine a CSI-RS beam direction using channel reciprocity; if the uplink and downlink statistical reciprocity exists in Frequency Division Duplex (FDD), the method can also be used, otherwise, the base station can send a low-speed non-Precoding CSI-RS or a Cell-specific BF CSI-RS, and then the UE reports a Precoding Matrix Indicator (PMI) for the base station to determine the CSI-RS beam direction. However, both the non-precoded CSI-RS and the Cell-specific BF CSI-RS are configured periodically, and the transmission period and the subframe offset are configured by the higher-layer parameter subframe configuration. More reference signal resources are allocated to the Cell-specific BF CSI-RS, and the utilization rate of the CSI-RS resources is reduced; resource Elements (REs) required by the non-precoded CSI-RS are more, and are limited to a shorter transmission period, and the maximum period is still much smaller than the change rate of the beam direction under normal conditions, thereby causing the waste of reference signal resources.
Disclosure of Invention
In view of this, the present invention provides a method and an apparatus for calibrating a narrowband CSI-RS beam direction, so as to improve a utilization rate of a reference signal resource of a narrowband CSI-RS and flexibly adjust the narrowband CSI-RS beam direction.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, an embodiment of the present invention provides a method for reporting channel state information, including:
receiving a narrowband channel state information reference signal CSI-RS and an aperiodic CSI-RS sent by a base station;
respectively carrying out channel measurement according to the narrow-band CSI-RS and the aperiodic CSI-RS;
determining Channel State Information (CSI) reported to the base station according to a channel measurement result and the type of the aperiodic CSI-RS;
reporting the CSI to the base station so that the base station calibrates the beam direction of the narrow-band CSI-RS according to a preset rule when determining that the beam direction of the narrow-band CSI-RS needs to be calibrated according to the CSI, wherein the CSI comprises a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI) and a Rank Indicator (RI).
In a second aspect, an embodiment of the present invention provides a method for calibrating a narrowband channel state information reference signal beam direction, including:
sending a narrow-band channel state information reference signal CSI-RS and an aperiodic CSI-RS to User Equipment (UE);
receiving channel measurement results reported by UE (user equipment) and based on the narrow-band CSI-RS and the aperiodic CSI-RS and Channel State Information (CSI) determined by the type of the aperiodic CSI-RS, wherein the CSI comprises a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI) and a Rank Indicator (RI);
and according to the CSI, when the beam direction of the narrow-band CSI-RS needs to be calibrated is determined, the beam direction of the narrow-band CSI-RS is calibrated according to a preset rule.
In a third aspect, an embodiment of the present invention provides an apparatus for reporting channel state information, configured in a user equipment UE, including:
the CSI-RS receiving module is used for receiving a narrow-band channel state information reference signal (CSI-RS) and an aperiodic CSI-RS which are sent by a base station;
the channel measurement module is used for carrying out channel measurement according to the narrow-band CSI-RS and the aperiodic CSI-RS respectively;
a CSI determining module, configured to determine, according to a channel measurement result and the type of the aperiodic CSI-RS, channel state information CSI reported to the base station;
and the CSI reporting module is used for reporting the CSI to the base station so that the base station calibrates the beam direction of the narrow-band CSI-RS according to a preset rule when determining that the beam direction of the narrow-band CSI-RS needs to be calibrated according to the CSI, wherein the CSI comprises a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI) and a Rank Indicator (RI).
In a fourth aspect, an embodiment of the present invention provides an apparatus for calibrating a beam direction of a narrowband csi-rs reference signal, where the apparatus is configured in a base station, and the apparatus includes:
the CSI-RS sending module is used for sending a narrow-band channel state information reference signal CSI-RS and an aperiodic CSI-RS to User Equipment (UE);
a CSI receiving module, configured to receive a channel measurement result, which is reported by a UE and is based on the narrowband CSI-RS and the aperiodic CSI-RS, and channel state information CSI determined according to the type of the aperiodic CSI-RS, where the CSI includes a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI), and a Rank Indicator (RI);
and the beam direction calibration module is used for calibrating the beam direction of the narrow-band CSI-RS according to a preset rule when the beam direction of the narrow-band CSI-RS is determined to be calibrated according to the CSI.
The invention has the beneficial effects that: according to the method and the device for calibrating the beam direction of the narrowband channel state information reference signal, the base station sends the configured aperiodic CSI-RS to the UE on the basis that the existing base station sends the narrowband CSI-RS to the UE, the UE respectively carries out channel measurement on the basis of the received narrowband CSI-RS and the aperiodic CSI-RS, the CSI reported to the base station is determined according to the channel measurement result and the type of the aperiodic CSI-RS, and the base station calibrates the beam direction of the narrowband CSI-RS according to the reported CSI. Therefore, the base station can send the aperiodic CSI-RS to the UE at any time according to the actual conditions such as the change rate of the wave beam direction and the like, the wave beam direction of the narrow-band CSI-RS can be selectively adjusted by the base station according to the CSI reported by the UE, the utilization rate of the reference signal resource of the narrow-band CSI-RS is improved, the wave beam direction of the narrow-band CSI-RS is more suitable for the channel state of the UE, the UE can conveniently select the optimal narrow-band wave beam from the wave beam direction, and the resource cost is reduced.
Drawings
The above and other features and advantages of the present invention will become more apparent to those of ordinary skill in the art by describing in detail exemplary embodiments thereof with reference to the attached drawings, in which:
fig. 1 is a schematic flowchart of a CSI reporting method according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an aperiodic CSI-RS reporting process according to a first embodiment of the present invention;
fig. 3 is a schematic flow chart of a CSI reporting method according to a second embodiment of the present invention;
fig. 4 is a schematic diagram of a CSI-RS reporting process according to a second embodiment of the present invention;
fig. 5 is a schematic flow chart of a CSI reporting method according to a third embodiment of the present invention;
fig. 6 is a schematic diagram of a CSI-RS reporting process provided by the third embodiment of the present invention;
fig. 7 is a schematic flowchart of a method for calibrating a narrowband CSI-RS beam direction according to a fourth embodiment of the present invention;
fig. 8 is a schematic flowchart of a method for calibrating a narrowband CSI-RS beam direction according to a fifth embodiment of the present invention;
fig. 9 is a schematic flowchart of a method for calibrating a narrowband CSI-RS beam direction according to a sixth embodiment of the present invention;
fig. 10 is a block diagram of a CSI reporting apparatus according to a seventh embodiment of the present invention;
fig. 11 is a block diagram of a calibration apparatus for a narrowband CSI-RS beam direction according to an eighth embodiment of the present invention.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a flowchart illustrating a CSI reporting method according to an embodiment of the present invention. The method is suitable for the condition of calibrating the narrow-band CSI-RS in an LTE system, and can be executed by a reporting device of channel state information or User Equipment (UE). The reporting apparatus of the csi may be implemented by software and/or hardware, and may be configured in the UE. As shown in fig. 1, the method includes:
and step 101, receiving the narrow-band CSI-RS and the aperiodic CSI-RS sent by the base station.
The base station may be an evolved Node B (eNB), the narrowband CSI-RS is configured periodically, a transmission period and subframe offset of the narrowband CSI-RS are configured by a higher layer parameter subframe, and configuration information of the aperiodic CSI-RS is configured semi-statically through Radio Resource Control (RRC) signaling. In addition, in this embodiment, the aperiodic CSI-RS may include at least one narrowband beamforming CSI-RS, or non-precoded CSI-RS, or wideband beamforming CSI-RS.
Specifically, as shown in fig. 2, the reporting process of the aperiodic CSI-RS is embodied as follows: when the UE receives the non-periodic CSI-RS trigger signaling sent by the base station in the subframe n, the UE transmits the non-periodic CSI-RS trigger signaling in the subframe n + k1Receiving an aperiodic CSI-RS, where k1Is a fixed value and k1E {0,1,2,3,4}, or k1Determined by the subframe configuration of the higher layer parameters. The base station triggers at least one aperiodic CSI-RS through Downlink Control Information (DCI) signaling, and the aperiodic CSI-RS triggering signaling is used for indicating UE to report CSI.
Exemplarily, at k1When the subframe configuration of the high-layer parameters is determined, the aperiodic CSI-RS still configures the high-layer parameters subframeconfig, and indicates the subframe period and the subframe offset of the aperiodic CSI-RS. And if the UE receives the aperiodic CSI-RS triggering signaling in the subframe n, the aperiodic CSI-RS is received by the UE in the first subframe which is larger than or equal to the subframe n and meets the subframe period and the subframe offset. For example, one subframe period is 10ms, the subframe offset is-1, and if the UE receives the aperiodic CSI-RS trigger signaling in subframe 8, the aperiodic CSI-RS is received by the UE in subframe 9.
And step 102, channel measurement is carried out according to the narrow-band CSI-RS and the aperiodic CSI-RS respectively.
Illustratively, the last received narrowband CSI-RS and aperiodic CSI-RS are respectively measured to obtain the narrowband CSI and aperiodic CSI, so as to obtain the latest narrowband CSI and aperiodic CSI, thereby improving the accuracy of CSI reporting. The CSI includes a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI) and a Rank Indicator (RI), the CQI is used to reflect the Channel Quality of a Physical Downlink Shared Channel (PDSCH), the PMI is used to indicate an index of a codebook set, and the RI is used to indicate an effective number of data layers of the PDSCH.
And 103, determining the CSI reported to the base station according to the channel measurement result and the type of the aperiodic CSI-RS.
In this embodiment, after the narrowband CSI and the aperiodic CSI are obtained according to the channel measurement result, it may be determined whether the CSI reported to the base station is the narrowband CSI or the aperiodic CSI or both the narrowband CSI and the aperiodic CSI are reported to the base station according to the type of the aperiodic CSI-RS sent by the base station.
Illustratively, when the aperiodic CSI-RS comprises at least one narrowband beamforming CSI-RS, the CSI-RS with a larger signal-to-noise ratio is calculated according to a preset criterion, and the UE reports the CSI corresponding to the CSI-RS with the larger signal-to-noise ratio; and when the aperiodic CSI-RS comprises the non-precoded CSI-RS or the wideband beamforming CSI-RS, reporting the narrowband CSI and the aperiodic CSI to the base station.
And step 104, reporting the CSI to the base station.
Illustratively, referring to fig. 2, in reporting aperiodic CSI, the UE is in subframe n + k1+k2And reporting the aperiodic CSI and carrying through a PUSCH. Wherein k is2Is carried out as specified in the existing protocol, e.g. for FDD systems, k2And reporting the aperiodic CSI carried by the PUSCH according to the format of the existing protocol as well as 4.
In the method for reporting channel state information provided in the embodiment of the present invention, on the basis that an existing base station sends a narrowband CSI-RS to a UE, the UE performs channel measurement based on the received narrowband CSI-RS and aperiodic CSI-RS, and determines CSI reported to the base station according to a channel measurement result and a type of the aperiodic CSI-RS, so that the base station calibrates a beam direction of the narrowband CSI-RS according to the reported CSI. Therefore, the base station can send the aperiodic CSI-RS to the UE at any time according to the actual conditions such as the change rate of the wave beam direction and the like, the wave beam direction of the narrow-band CSI-RS can be selectively adjusted by the base station according to the CSI reported by the UE, the utilization rate of the reference signal resource of the narrow-band CSI-RS is improved, the wave beam direction of the narrow-band CSI-RS is more suitable for the channel state of the UE, the UE can conveniently select the optimal narrow-band wave beam from the wave beam direction, and the resource cost is reduced.
Further, before reporting the CSI to the base station, the method further includes:
and configuring a reporting resource indication for the CSI so that the base station determines the CSI-RS corresponding to the CSI. For example, the reporting resource indicator may be represented by 0 and 1, where 0 represents an aperiodic CSI-RS and 1 represents a narrowband CSI-RS.
Example two
Fig. 3 is a flowchart illustrating a CSI reporting method according to a second embodiment of the present invention. In this embodiment, based on the first embodiment, the step of determining the CSI reported to the base station according to the channel measurement result and the type of the aperiodic CSI-RS is optimized as follows: when the aperiodic CSI-RS comprises at least one narrow-band beam forming CSI-RS, determining a narrow-band precoding matrix according to the narrow-band RI and the narrow-band PMI of the narrow-band CSI, and determining an aperiodic precoding matrix according to the aperiodic RI and the aperiodic PMI of the aperiodic CSI; determining a narrowband code word in the best beam direction in the narrowband CSI-RS according to a narrowband precoding matrix and a preset principle, and determining an aperiodic code word in the best beam direction in the aperiodic CSI-RS according to an aperiodic precoding matrix and the preset principle; calculating the signal-to-noise ratio of the narrow-band CSI-RS according to the narrow-band code words, and calculating the signal-to-noise ratio of the aperiodic CSI-RS according to the aperiodic code words; and comparing the signal-to-noise ratio of the narrow-band CSI-RS with the signal-to-noise ratio of the aperiodic CSI-RS, and determining the CSI corresponding to the CSI-RS with larger signal-to-noise ratio as the CSI reported to the base station.
Correspondingly, as shown in fig. 3, the method of the present embodiment includes:
step 201, receiving a narrowband CSI-RS and an aperiodic CSI-RS sent by a base station.
And step 202, performing channel measurement according to the narrow-band CSI-RS and the aperiodic CSI-RS respectively.
Illustratively, as shown in fig. 4, the last received narrowband CSI-RS and aperiodic CSI-RS are measured within a measurement window. The length of the measurement window may be a time interval between two adjacent narrowband CSI-RSs, or a time interval between two adjacent aperiodic CSI-RSs.
And 203, when the aperiodic CSI-RS comprises at least one narrow-band beamforming CSI-RS, determining a narrow-band precoding matrix according to the narrow-band RI and the narrow-band PMI of the narrow-band CSI, and determining an aperiodic precoding matrix according to the aperiodic RI and the aperiodic PMI of the aperiodic CSI.
The configuration information of the narrowband beamforming CSI-RS comprises resources of the narrowband beamforming CSI-RS and codebook information, and specifically comprises non-zero power CSI-RS resources, interference measurement reference signal resources, power and codebook subset selection limits, and on/off limits of codebook and channel measurement.
And 204, determining a narrowband code word in the best beam direction in the narrowband CSI-RS according to a narrowband precoding matrix and a preset principle, and determining an aperiodic code word in the best beam direction in the aperiodic CSI-RS according to an aperiodic precoding matrix and the preset principle.
Illustratively, the narrowband codeword in the best beam direction in the narrowband CSI-RS and the aperiodic codeword in the best beam direction in the aperiodic CSI-RS may be determined respectively according to a maximum mutual information amount principle or a maximum output signal-to-noise ratio principle.
And step 205, calculating the signal-to-noise ratio of the narrow-band CSI-RS according to the narrow-band code words, and calculating the signal-to-noise ratio of the aperiodic CSI-RS according to the aperiodic code words.
Specifically, the formula for calculating the signal-to-noise ratio of the CSI-RS is as follows:
Figure BDA0000952591840000071
wherein, P is the transmitting power, H is the channel fading factor, w is the code word corresponding to the wave beam in the CSI-RS, I is the channel interference, and N is the noise interference.
The narrow-band code words, the aperiodic code words and other related parameters are respectively substituted into the formula, so that the signal-to-noise ratio of the narrow-band CSI-RS and the signal-to-noise ratio of the aperiodic CSI-RS can be obtained.
And step 206, comparing the signal-to-noise ratio of the narrow-band CSI-RS with the signal-to-noise ratio of the aperiodic CSI-RS, and determining the CSI corresponding to the CSI-RS with larger signal-to-noise ratio as the CSI reported to the base station.
And step 207, reporting the CSI to the base station.
In the method for reporting channel state information provided in the second embodiment of the present invention, when the aperiodic CSI-RS includes at least one narrowband beamforming CSI-RS, by determining the narrowband codeword in the optimal beam direction in the narrowband CSI-RS and the aperiodic codeword in the optimal beam direction in the aperiodic CSI-RS, and further obtaining the signal-to-noise ratio of the narrowband CSI-RS and the signal-to-noise ratio of the aperiodic CSI-RS according to the determined codewords, the CSI corresponding to the CSI-RS with a larger signal-to-noise ratio is reported to the base station, so that the base station can selectively adjust the beam direction of the narrowband CSI-RS according to the CSI reported by the UE, improve the utilization rate of the narrowband CSI-RS reference signal resource, make the beam direction of the narrowband CSI-RS more suitable for the channel state of the UE, so that the UE can select the optimal narrowband beam from the beam, and reduce the resource overhead.
EXAMPLE III
Fig. 5 is a flowchart illustrating a CSI reporting method according to a third embodiment of the present invention. In this embodiment, based on the first embodiment, the step of determining the CSI reported to the base station according to the channel measurement result and the type of the aperiodic CSI-RS is optimized as follows: and when the aperiodic CSI-RS comprises the non-precoded CSI-RS or the wideband beamforming CSI-RS, determining the narrowband CSI and the aperiodic CSI as the CSI reported to the base station.
Correspondingly, as shown in fig. 5, the method of the present embodiment includes:
and step 301, receiving the narrow-band CSI-RS and the aperiodic CSI-RS sent by the base station.
And step 302, channel measurement is carried out according to the narrow-band CSI-RS and the aperiodic CSI-RS respectively.
And step 303, when the aperiodic CSI-RS comprises a non-precoded CSI-RS or a wideband beamforming CSI-RS, determining the narrowband CSI and the aperiodic CSI as CSI reported to the base station.
The configuration information of the non-precoded CSI-RS comprises the number of CSI-RS ports, resource indexes, subframe configurations and scrambling code IDs, quasi-synchronous configuration with cell-specific pilot CRSs, CSI reporting codebook information active control and codebook subset selection of the non-precoded CSI-RS, the number of first-dimension and second-dimension antennas, the first-dimension and second-dimension oversampling rates and interference measurement limiting configuration.
The configuration information of the wideband beamforming CSI-RS comprises resource information of the wideband beamforming CSI-RS. The resource information includes a non-zero power CSI-RS resource list, an interference measurement reference signal resource list, a power and codebook subset selection restriction list, and channel measurement restriction on/off.
And step 304, reporting the CSI to the base station.
Referring to fig. 6, when the aperiodic CSI-RS includes the non-precoded CSI-RS or the wideband beamforming CSI-RS, the UE respectively reports the narrowband CSI and the aperiodic CSI to the eNB after measuring the narrowband CSI-RS and the aperiodic CSI-RS transmitted by the eNB.
According to the method for reporting channel state information provided by the third embodiment of the invention, when the aperiodic CSI-RS comprises the non-precoded CSI-RS or the wideband beamforming CSI-RS, both the narrowband CSI and the aperiodic CSI are reported to the base station, so that the base station can selectively adjust the beam direction of the narrowband CSI-RS according to the CSI reported by the UE, the utilization rate of the narrowband CSI-RS reference signal resource is improved, the beam direction of the narrowband CSI-RS is more suitable for the channel state of the UE, the UE can conveniently select the optimal narrowband beam from the optimal narrowband beam, and the resource overhead is reduced.
Example four
Fig. 7 is a flowchart illustrating a calibration method for a narrowband CSI-RS beam direction according to a fourth embodiment of the present invention. The method is suitable for the case of calibrating the narrowband CSI-RS in the LTE system, and can be executed by a calibration device or a base station of the narrowband CSI-RS beam direction. The calibration device for the narrow-band CSI-RS beam direction can be implemented by software and/or hardware, and can be configured in a base station. As shown in fig. 7, the method includes:
step 401, sending the narrow-band CSI-RS and the aperiodic CSI-RS to the UE.
The base station may be an evolved Node B (eNB), the narrowband CSI-RS is configured periodically, a transmission period and subframe offset of the narrowband CSI-RS are configured by a higher layer parameter subframe, and configuration information of the aperiodic CSI-RS is configured semi-statically through Radio Resource Control (RRC) signaling. In addition, in this embodiment, the aperiodic CSI-RS may include at least one narrowband beamforming CSI-RS, or non-precoded CSI-RS, or wideband beamforming CSI-RS.
Referring to fig. 2, when a base station transmits aperiodic CSI-RS trigger signaling to the UE in subframe n, in subframe n + k1Sending out theAperiodic CSI-RS where k1Is a fixed value and k1E {0,1,2,3,4}, or k1Determined by the subframe configuration of the higher layer parameters. The base station triggers at least one aperiodic CSI-RS through Downlink Control Information (DCI) signaling, and the aperiodic CSI-RS triggering signaling is used for indicating UE to report CSI.
Exemplarily, at k1When the subframe configuration of the high-layer parameters is determined, the aperiodic CSI-RS still configures the high-layer parameters subframeconfig, and indicates the subframe period and the subframe offset of the aperiodic CSI-RS. And if the base station sends the aperiodic CSI-RS triggering signaling in the subframe n, the aperiodic CSI-RS is transmitted by the base station in the first subframe which is larger than or equal to the subframe n and meets the subframe period and the subframe offset. For example, one subframe period is 10ms, the subframe offset is-1, and if the base station sends the aperiodic CSI-RS trigger signaling in subframe 8, the aperiodic CSI-RS is transmitted by the base station in subframe 9.
Step 402, receiving a channel measurement result based on a narrow-band CSI-RS and an aperiodic CSI-RS reported by the UE, and CSI determined by the type of the aperiodic CSI-RS.
The CSI comprises CQI, PMI and RI, wherein the CQI is used for reflecting the channel quality of the PDSCH, the PMI is used for indicating the index of a codebook set, and the RI is used for indicating the effective number of data layers of the PDSCH.
Illustratively, when the aperiodic CSI-RS comprises at least one narrowband beamforming CSI-RS, the base station receives CSI corresponding to the CSI-RS with a larger signal-to-noise ratio calculated by the UE according to a preset criterion; when the aperiodic CSI-RS comprises a non-precoded CSI-RS or a wideband beamforming CSI-RS, the base station receives the narrowband CSI and the aperiodic CSI.
And step 403, calibrating the beam direction of the narrow-band CSI-RS according to a preset rule when the beam direction of the narrow-band CSI-RS is determined to be calibrated according to the CSI.
In this embodiment, the base station determines whether the beam direction of the narrowband CSI-RS needs to be calibrated according to the reported CSI, and calibrates the beam direction of the narrowband CSI-RS according to a preset rule when determining that the beam direction of the narrowband CSI-RS needs to be calibrated.
Wherein, the determining whether the beam direction of the narrowband CSI-RS needs to be calibrated may include: when the reported CSI is determined to be the narrowband CSI, the beam direction of the narrowband CSI-RS is not calibrated; or when the CQI of the reported narrow-band CSI is determined to be better than the CQI of the aperiodic CSI, the beam direction of the narrow-band CSI-RS is not calibrated.
In addition, calibrating the beam direction of the narrowband CSI-RS according to a preset rule may include: adding a preferred beam to the narrowband CSI-RS according to the determined CSI; or obtaining a precoding matrix according to the determined CSI, and adjusting the polarization angle of the wave beam which is not matched with the precoding matrix in the narrow-band CSI-RS.
According to the method for calibrating the beam direction of the narrowband channel state information reference signal provided by the fourth embodiment of the invention, on the basis that the existing base station sends the narrowband CSI-RS to the UE, the base station sends the configured aperiodic CSI-RS to the UE, the base station respectively carries out channel measurement according to the received narrowband CSI-RS and aperiodic CSI-RS, and determines the reported CSI and calibrates the beam direction of the narrowband CSI-RS according to the channel measurement result and the type of the aperiodic CSI-RS. Therefore, the base station can send the aperiodic CSI-RS to the UE at any time according to the actual conditions such as the change rate of the wave beam direction and the like, the wave beam direction of the narrow-band CSI-RS can be selectively adjusted by the base station according to the CSI reported by the UE, the utilization rate of the reference signal resource of the narrow-band CSI-RS is improved, the wave beam direction of the narrow-band CSI-RS is more suitable for the channel state of the UE, the UE can conveniently select the optimal narrow-band wave beam from the wave beam direction, and the resource cost is reduced.
EXAMPLE five
Fig. 8 is a flowchart illustrating a calibration method for a narrowband CSI-RS beam direction according to a fifth embodiment of the present invention. Based on the fourth embodiment, the embodiment optimizes the beam direction of the narrowband CSI-RS calibrated according to the preset rule when the beam direction of the narrowband CSI-RS needs to be calibrated in the step: when the aperiodic CSI-RS comprises at least one narrow-band beam forming CSI-RS, judging whether the CSI is aperiodic CSI corresponding to the aperiodic CSI-RS; if the CSI is determined to be the aperiodic CSI, determining a preset number of preferred beams selected by the UE according to a preset principle in the aperiodic CSI-RS according to the aperiodic CSI; and adding a preset number of preferable beams into the narrow-band CSI-RS, and simultaneously reducing the preset number of standby beams which are selected by the UE at least in the narrow-band CSI-RS.
Correspondingly, as shown in fig. 8, the method of the present embodiment includes:
and step 501, sending the narrow-band CSI-RS and the aperiodic CSI-RS to User Equipment (UE).
Step 502, receiving a channel measurement result based on a narrow-band CSI-RS and an aperiodic CSI-RS reported by the UE, and CSI determined by the type of the aperiodic CSI-RS.
Step 503, when the aperiodic CSI-RS includes at least one narrowband beamforming CSI-RS, determining whether the CSI is aperiodic CSI corresponding to the aperiodic CSI-RS.
Specifically, the determining whether the CSI is the aperiodic CSI corresponding to the aperiodic CSI-RS may include:
A. and determining the CSI-RS corresponding to the CSI according to the reporting resource indication configured in the CSI.
The reporting resource indication can be represented by 0 and 1, wherein 0 represents an aperiodic CSI-RS, and 1 represents a narrowband CSI-RS.
B. And judging whether the CSI is the aperiodic CSI corresponding to the aperiodic CSI-RS or not according to the determination result.
And step 504, if the CSI is determined to be the aperiodic CSI, determining a preset number of preferred beams selected by the UE according to a preset principle in the aperiodic CSI-RS according to the aperiodic CSI.
The preset number can be uniquely determined by the PMI and the RI, the UE can select the preset number of preferred beams from the aperiodic CSI-RS received by the UE according to a maximum mutual information amount principle or a maximum output signal-to-noise ratio principle and report the beams to the base station in an aperiodic CSI mode, and the base station can determine the preset number of preferred beams through the aperiodic CSI-RS. In addition, if the reported CSI is determined to be the narrowband CSI, the beam direction of the narrowband CSI-RS is not adjusted.
And step 505, adding a preset number of preferred beams to the narrow-band CSI-RS, and reducing the preset number of standby beams selected by the UE at least in the narrow-band CSI-RS.
The base station of this embodiment may perform statistics on CSI reported by the UE before, and perform statistics on the preset number of backup beams that are selected by the UE at least. Illustratively, the column vector corresponding to the spare beam in the narrowband CSI-RS precoding matrix is replaced with the column vector corresponding to the preferred beam.
According to the method for calibrating the beam direction of the narrowband channel state information reference signal provided by the fifth embodiment of the invention, when the aperiodic CSI-RS comprises at least one narrowband beam forming CSI-RS and the reported CSI is determined to be the aperiodic CSI, the preset number of preferable beams fed back by the UE are added into the narrowband CSI-RS, and meanwhile, the preset number of standby beams selected by the UE at least in the narrowband CSI-RS are reduced, so that the utilization rate of narrowband CSI-RS reference signal resources is improved, the beam direction of the narrowband CSI-RS is more suitable for the channel state of the UE, the UE can select the best narrowband beam from the candidate beams, and the resource cost is reduced.
EXAMPLE six
Fig. 9 is a flowchart illustrating a method for calibrating a narrowband CSI-RS beam direction according to a sixth embodiment of the present invention. Based on the fourth embodiment, the embodiment optimizes the beam direction of the narrowband CSI-RS calibrated according to the preset rule when the beam direction of the narrowband CSI-RS needs to be calibrated in the step: when the aperiodic CSI-RS comprises the non-precoding CSI-RS or the wideband beamforming CSI-RS, comparing a narrowband CQI in the narrowband CSI reported by the UE with an aperiodic CQI in the aperiodic CSI; if the aperiodic CQI is larger than the narrowband CQI, determining a preset number of preferred beams selected by the UE according to a preset principle in the aperiodic CSI-RS according to the aperiodic CSI; and adding a preset number of preferable beams into the narrow-band CSI-RS, and simultaneously reducing the preset number of standby beams which are selected by the UE at least in the narrow-band CSI-RS.
Correspondingly, as shown in fig. 9, the method of the present embodiment includes:
step 601, sending the narrow-band CSI-RS and the aperiodic CSI-RS to user equipment UE.
Step 602, receiving a channel measurement result based on the narrowband CSI-RS and the aperiodic CSI-RS reported by the UE, and CSI determined by the type of the aperiodic CSI-RS.
Step 603, when the aperiodic CSI-RS comprises a non-precoded CSI-RS or a wideband beamforming CSI-RS, comparing the narrowband CQI in the narrowband CSI reported by the UE with the aperiodic CQI in the aperiodic CSI.
And step 604, if the aperiodic CQI is larger than the narrowband CQI, determining a preset number of preferred beams selected by the UE according to a preset principle in the aperiodic CSI-RS according to the aperiodic CSI.
And if the aperiodic CQI is smaller than the narrowband CQI, not adjusting the beam direction of the narrowband CSI-RS.
Step 605, adding a preset number of preferred beams to the narrowband CSI-RS, and reducing the preset number of backup beams selected by the UE at least in the narrowband CSI-RS.
In addition, taking the non-precoded CSI-RS as an example, the beam direction of the narrowband CSI-RS may also be adjusted as follows according to the aperiodic CSI:
the base station can construct a precoding matrix, denoted as W, according to the PMI and RI in the CSI, and can obtain the channel state of each antenna array element; and judging whether each narrowband wave beam in the narrowband CSI-RS is matched with W, if not, the wave beam direction needs to be readjusted, and constructing a new narrowband wave beam by W again.
Illustratively, the rank of W is 1 and the phase angles of the two polarization directions are
Figure BDA0000952591840000121
Figure BDA0000952591840000122
Wherein Q is 2N1N2Is the total number of ports in the aperiodic CSI-RS, N1Indicates the number of first dimension antenna ports, N2The number of antenna ports in the first dimension is represented,
Figure BDA0000952591840000123
for a DFT vector with a first dimension sampling rate of N1x1,
Figure BDA0000952591840000131
for a DFT vector with a second dimension sampling rate of N2x1,
Figure BDA0000952591840000132
is a phase coefficient, m1∈{0,1，……，O1N1}，m2∈{0,1，……，O2N2}，O1Is the first dimension oversampling ratio, O2Is the second dimension oversampling ratio.
The current narrowband beam contains two beam directions, where the weight vector for one beam is represented as:
Figure BDA0000952591840000133
wherein M is the number of antenna elements corresponding to the horizontal TXRU; n is the number of antenna array elements corresponding to the vertical TXRU; dVThe vertical spacing of the antenna elements is represented; dHRepresenting the horizontal spacing of the antenna elements; λ is the wavelength; m is 1,2, … …, M; n is 1,2, … …, N; p' represents the number of polarized antennas, 1 and 2 can be selected, when the number is 1, the single-polarized antenna is represented, and when the number is 2, the dual-polarized antenna is represented; p is 1, 2; thetam'Is the electronic downtilt of the antenna array element;
Figure BDA0000952591840000134
the horizontal azimuth angle of the antenna array element is; psim',n′Is the polarization angle.
Adjusting the polarization angle psi of the beam with reference to the value of n of Wm',n′Making it more suitable for the channel conditions.
According to the method for calibrating the beam direction of the narrowband channel state information reference signal provided by the sixth embodiment of the invention, when the aperiodic CSI-RS comprises the non-precoded CSI-RS or the wideband beam forming CSI-RS and the aperiodic CQI is greater than the narrowband CQI, the preset number of preferable beams fed back by the UE are added into the narrowband CSI-RS, and meanwhile, the preset number of standby beams selected by the UE at least in the narrowband CSI-RS are reduced, so that the utilization rate of narrowband CSI-RS reference signal resources is improved, the beam direction of the narrowband CSI-RS is more suitable for the channel state of the UE, the UE can select the best narrowband beam from the standby beams, and the resource cost is reduced.
EXAMPLE seven
Fig. 10 is a block diagram of a CSI reporting apparatus according to a seventh embodiment of the present invention. As shown in fig. 10, the apparatus may be configured in a user equipment UE, and includes a CSI-RS receiving module 10, a channel measuring module 11, a CSI determining module 12, and a CSI reporting module 13.
The CSI-RS receiving module 10 is configured to receive a narrowband CSI-RS and an aperiodic CSI-RS sent by a base station;
the channel measurement module 11 is configured to perform channel measurement according to the narrowband CSI-RS and the aperiodic CSI-RS, respectively;
the CSI determining module 12 is configured to determine, according to the channel measurement result and the type of the aperiodic CSI-RS, channel state information CSI reported to the base station;
and the CSI reporting module 13 is configured to report the CSI to the base station, so that the base station calibrates the beam direction of the narrowband CSI-RS according to a preset rule when determining the beam direction of the narrowband CSI-RS that needs to be calibrated according to the CSI, where the CSI includes a channel quality indicator CQI, a precoding matrix indicator PMI, and a rank indicator RI.
Further, the channel measurement module 11 is specifically configured to:
and respectively measuring the narrow-band CSI-RS and the aperiodic CSI-RS which are received for the last time to obtain the narrow-band CSI and the aperiodic CSI.
Preferably, the CSI determining module 12 may include:
the precoding matrix determining unit is used for determining a narrowband precoding matrix according to the narrowband RI and the narrowband PMI of the narrowband CSI and determining an aperiodic precoding matrix according to the aperiodic RI and the aperiodic PMI of the aperiodic CSI when the aperiodic CSI-RS comprises at least one narrowband beamforming CSI-RS;
the code word determining unit is used for determining a narrowband code word in the best beam direction in the narrowband CSI-RS according to a narrowband precoding matrix and a preset principle, and determining an aperiodic code word in the best beam direction in the aperiodic CSI-RS according to an aperiodic precoding matrix and the preset principle;
the signal-to-noise ratio calculation unit is used for calculating the signal-to-noise ratio of the narrow-band CSI-RS according to the narrow-band code words and calculating the signal-to-noise ratio of the aperiodic CSI-RS according to the aperiodic code words;
and the first CSI determining unit is used for comparing the signal-to-noise ratio of the narrow-band CSI-RS with the signal-to-noise ratio of the aperiodic CSI-RS and determining the CSI corresponding to the CSI-RS with larger signal-to-noise ratio as the CSI reported to the base station.
Further, the CSI determining module 12 may also include:
and the second CSI determining unit is used for determining the narrow-band CSI and the aperiodic CSI as the CSI reported to the base station when the aperiodic CSI-RS comprises a non-precoded CSI-RS or a wideband beamforming CSI-RS.
Preferably, in the foregoing scheme, the CSI reporting apparatus further includes:
and the reporting resource indication configuration module is used for configuring reporting resource indication for the CSI before reporting the CSI to the base station so that the base station determines the CSI-RS corresponding to the CSI.
Further, the CSI-RS receiving module 10 is specifically configured to:
when subframe n receives an aperiodic CSI-RS trigger signaling sent by a base station, subframe n + k1Receiving an aperiodic CSI-RS, where k1Is a fixed value and k1E {0,1,2,3,4}, or k1Determined by the subframe configuration of the higher layer parameters.
The CSI reporting apparatus provided in this embodiment belongs to the same inventive concept as the CSI reporting method provided in the embodiment of the present invention, and may perform the CSI reporting method provided in the embodiment of the present invention, and has corresponding functions and beneficial effects. For details of the CSI reporting method provided in the embodiment of the present invention, reference may be made to the technical details not described in detail in this embodiment.
Example eight
Fig. 11 is a device for calibrating a narrowband CSI-RS beam direction according to an eighth embodiment of the present invention. As shown in fig. 11, the apparatus may be configured in a base station and includes a CSI-RS transmitting module 20, a CSI receiving module 21, and a beam direction calibration module 22.
The CSI-RS sending module 20 is configured to send a narrowband CSI-RS and an aperiodic CSI-RS to a user equipment UE;
the CSI receiving module 21 is configured to receive a channel measurement result based on a narrowband CSI-RS and an aperiodic CSI-RS reported by the UE and a channel state information CSI determined by a type of the aperiodic CSI-RS, where the CSI includes a channel quality indicator CQI, a precoding matrix indicator PMI, and a rank indicator RI;
and the beam direction calibration module 22 is configured to calibrate the beam direction of the narrowband CSI-RS according to a preset rule when the beam direction of the narrowband CSI-RS needs to be calibrated is determined according to the CSI.
Preferably, the beam direction calibration module 22 includes:
the CSI judging unit is used for judging whether the CSI is the aperiodic CSI corresponding to the aperiodic CSI-RS or not when the aperiodic CSI-RS comprises at least one narrowband beamforming CSI-RS;
a first preferred beam determining unit, configured to determine, according to the aperiodic CSI, a preset number of preferred beams selected by the UE according to a preset principle in the aperiodic CSI-RS if it is determined that the CSI is the aperiodic CSI;
the first beam adjusting unit is configured to add a preset number of preferred beams to the narrowband CSI-RS, and reduce a preset number of spare beams, which are selected by the UE at least, in the narrowband CSI-RS.
Further, the CSI determining unit is specifically configured to:
determining a CSI-RS corresponding to the CSI according to a reporting resource indication configured in the CSI;
and judging whether the CSI is the aperiodic CSI corresponding to the aperiodic CSI-RS or not according to the determination result.
Further, the beam direction calibration module 22 may include:
the CQI comparison unit is used for comparing the narrow-band CQI in the narrow-band CSI reported by the UE with the aperiodic CQI in the aperiodic CSI when the aperiodic CSI-RS comprises the non-precoded CSI-RS or the wideband beamforming CSI-RS;
a second preferred beam determining unit, configured to determine, according to the aperiodic CSI, a preset number of preferred beams selected by the UE according to a preset rule in the aperiodic CSI-RS if the aperiodic CQI is greater than the narrowband CQI;
and the second beam adjusting unit is used for adding a preset number of preferred beams into the narrow-band CSI-RS and reducing the preset number of standby beams selected by the UE at least in the narrow-band CSI-RS.
Preferably, the CSI-RS sending module 20 is specifically configured to:
when the subframe n sends the aperiodic CSI-RS trigger signaling to the UE, the subframe n + k1Transmitting aperiodic CSI-RSWherein k is1Is a fixed value and k1E {0,1,2,3,4}, or k1Determined by the subframe configuration of the higher layer parameters.
The calibration device for the narrow-band CSI-RS beam direction provided by the embodiment of the present invention is the same as the calibration method for the narrow-band CSI-RS beam direction provided by the embodiment of the present invention, and the calibration method for the narrow-band CSI-RS beam direction provided by the embodiment of the present invention can be performed, so that the calibration device has corresponding functions and beneficial effects. For details of the technique not described in detail in this embodiment, reference may be made to the calibration method for the narrowband CSI-RS beam direction provided by the embodiment of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (16)

1. A method for reporting channel state information is characterized by comprising the following steps:
receiving a narrowband channel state information reference signal CSI-RS and an aperiodic CSI-RS sent by a base station;
respectively carrying out channel measurement according to the narrow-band CSI-RS and the aperiodic CSI-RS;
determining the Channel State Information (CSI) reported to the base station according to the channel measurement result and the type of the aperiodic CSI-RS, comprising: when the aperiodic CSI-RS comprises at least one narrow-band beam forming CSI-RS, the CSI-RS with a larger signal-to-noise ratio is calculated according to a preset criterion, and the UE reports the CSI corresponding to the CSI-RS with the larger signal-to-noise ratio; when the aperiodic CSI-RS comprises a non-precoded CSI-RS or a wideband beamforming CSI-RS, reporting both the narrowband CSI and the aperiodic CSI to the base station;
reporting the CSI to the base station so that the base station calibrates the beam direction of the narrowband CSI-RS according to a preset rule when determining that the beam direction of the narrowband CSI-RS needs to be calibrated according to the CSI, comprising:
when the aperiodic CSI-RS comprises at least one narrow-band beamforming CSI-RS, judging whether the CSI is aperiodic CSI corresponding to the aperiodic CSI-RS; if the CSI is determined to be the aperiodic CSI, determining a preset number of preferred beams selected by the UE according to a preset principle in the aperiodic CSI-RS according to the aperiodic CSI; adding the preset number of preferred beams to the narrow-band CSI-RS, and simultaneously reducing the preset number of standby beams selected by the UE at least in the narrow-band CSI-RS; and
when the aperiodic CSI-RS comprises a non-precoded CSI-RS or a wideband beamforming CSI-RS, comparing a narrowband CQI in the narrowband CSI reported by the UE with an aperiodic CQI in the aperiodic CSI; if the aperiodic CQI is larger than the narrowband CQI, determining a preset number of preferred beams selected by the UE according to a preset principle in the aperiodic CSI-RS according to the aperiodic CSI; adding the preset number of preferred beams to the narrow-band CSI-RS, and simultaneously reducing the preset number of standby beams selected by the UE at least in the narrow-band CSI-RS;
the CSI comprises a channel quality indication CQI, a precoding matrix indication PMI and a rank indication RI.
2. The method of claim 1, wherein the performing channel measurements according to the narrowband CSI-RS and aperiodic CSI-RS, respectively, comprises:
and respectively measuring the narrow-band CSI-RS and the aperiodic CSI-RS which are received for the last time to obtain the narrow-band CSI and the aperiodic CSI.
3. The method of claim 1, wherein the determining the CSI reported to the base station according to the CSI measurement result and the type of the aperiodic CSI-RS comprises:
when the aperiodic CSI-RS comprises at least one narrow-band beamforming CSI-RS, determining a narrow-band precoding matrix according to the narrow-band RI and the narrow-band PMI of the narrow-band CSI, and determining an aperiodic precoding matrix according to the aperiodic RI and the aperiodic PMI of the aperiodic CSI;
determining a narrowband code word in the optimal beam direction in the narrowband CSI-RS according to the narrowband precoding matrix and a preset principle, and determining an aperiodic code word in the optimal beam direction in the aperiodic CSI-RS according to the aperiodic precoding matrix and the preset principle;
calculating the signal-to-noise ratio of the narrow-band CSI-RS according to the narrow-band code words, and calculating the signal-to-noise ratio of the aperiodic CSI-RS according to the aperiodic code words;
and comparing the signal-to-noise ratio of the narrow-band CSI-RS with the signal-to-noise ratio of the aperiodic CSI-RS, and determining the CSI corresponding to the CSI-RS with larger signal-to-noise ratio as the CSI reported to the base station.
4. The method of claim 1, wherein before reporting the CSI to the base station, further comprising:
and configuring a reporting resource indication for the CSI so that the base station determines a CSI-RS corresponding to the CSI.
5. The method according to any of claims 1-4, wherein receiving the aperiodic CSI-RS transmitted by the base station comprises:
when subframe n receives an aperiodic CSI-RS trigger signaling sent by the base station, subframe n + k1Receiving the aperiodic CSI-RS, where k1Is a fixed value and k1E {0,1,2,3,4}, or k1Determined by the subframe configuration of the higher layer parameters.
6. A method for calibrating a narrow-band channel state information reference signal beam direction is characterized by comprising the following steps:
sending a narrow-band channel state information reference signal CSI-RS and an aperiodic CSI-RS to User Equipment (UE);
receiving channel measurement results based on the narrowband CSI-RS and the aperiodic CSI-RS reported by the UE and Channel State Information (CSI) determined by the type of the aperiodic CSI-RS, including: when the aperiodic CSI-RS comprises at least one narrow-band beam forming CSI-RS, the CSI-RS with a larger signal-to-noise ratio is calculated according to a preset criterion, and the UE reports the CSI corresponding to the CSI-RS with the larger signal-to-noise ratio; when the aperiodic CSI-RS comprises a non-precoded CSI-RS or a wideband beamforming CSI-RS, reporting both the narrowband CSI and the aperiodic CSI; the CSI comprises a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI) and a Rank Indicator (RI);
according to the CSI, when the beam direction of the narrow-band CSI-RS needs to be calibrated is determined, the beam direction of the narrow-band CSI-RS is calibrated according to a preset rule, and the method comprises the following steps:
when the aperiodic CSI-RS comprises at least one narrow-band beamforming CSI-RS, judging whether the CSI is aperiodic CSI corresponding to the aperiodic CSI-RS; if the CSI is determined to be the aperiodic CSI, determining a preset number of preferred beams selected by the UE according to a preset principle in the aperiodic CSI-RS according to the aperiodic CSI; adding the preset number of preferred beams to the narrow-band CSI-RS, and simultaneously reducing the preset number of standby beams selected by the UE at least in the narrow-band CSI-RS; and
when the aperiodic CSI-RS comprises a non-precoded CSI-RS or a wideband beamforming CSI-RS, comparing a narrowband CQI in the narrowband CSI reported by the UE with an aperiodic CQI in the aperiodic CSI; if the aperiodic CQI is larger than the narrowband CQI, determining a preset number of preferred beams selected by the UE according to a preset principle in the aperiodic CSI-RS according to the aperiodic CSI; adding the preset number of the preferred beams into the narrow-band CSI-RS, and simultaneously reducing the preset number of the standby beams which are selected by the UE at least in the narrow-band CSI-RS.
7. The method of claim 6, wherein the determining whether the CSI is aperiodic CSI corresponding to the aperiodic CSI-RS comprises:
determining a CSI-RS corresponding to the CSI according to the reporting resource indication configured in the CSI;
and judging whether the CSI is the aperiodic CSI corresponding to the aperiodic CSI-RS or not according to the determination result.
8. The method of claim 6 or 7, wherein transmitting the aperiodic CSI-RS to the UE comprises:
when subframe n sends aperiodic CSI-RS trigger signaling to the UE, subframe n + k1Transmitting the aperiodic CSI-RS, where k1Is a fixed value and k1E {0,1,2,3,4}, or k1Determined by the subframe configuration of the higher layer parameters.
9. An apparatus for reporting channel state information, configured in a User Equipment (UE), includes:
the CSI-RS receiving module is used for receiving a narrow-band channel state information reference signal (CSI-RS) and an aperiodic CSI-RS which are sent by a base station;
the channel measurement module is used for carrying out channel measurement according to the narrow-band CSI-RS and the aperiodic CSI-RS respectively;
a CSI determining module, configured to determine, according to a channel measurement result and a type of the aperiodic CSI-RS, channel state information CSI reported to the base station, where the CSI determining module includes: the first CSI determining unit is used for calculating the CSI-RS with larger signal-to-noise ratio according to a preset criterion when the aperiodic CSI-RS comprises at least one narrow-band beam forming CSI-RS, and the UE reports the CSI corresponding to the CSI-RS with larger signal-to-noise ratio; a second CSI determining unit, configured to report both the narrowband CSI and the aperiodic CSI to the base station when the aperiodic CSI-RS includes a non-precoded CSI-RS or a wideband beamforming CSI-RS;
a CSI reporting module, configured to report the CSI to the base station, so that the base station calibrates, according to the CSI, a beam direction of the narrowband CSI-RS according to a preset rule when determining that the beam direction of the narrowband CSI-RS needs to be calibrated, where the CSI reporting module is configured to:
when the aperiodic CSI-RS comprises at least one narrow-band beamforming CSI-RS, judging whether the CSI is aperiodic CSI corresponding to the aperiodic CSI-RS; if the CSI is determined to be the aperiodic CSI, determining a preset number of preferred beams selected by the UE according to a preset principle in the aperiodic CSI-RS according to the aperiodic CSI; adding the preset number of preferred beams to the narrow-band CSI-RS, and simultaneously reducing the preset number of standby beams selected by the UE at least in the narrow-band CSI-RS; and
when the aperiodic CSI-RS comprises a non-precoded CSI-RS or a wideband beamforming CSI-RS, comparing a narrowband CQI in the narrowband CSI reported by the UE with an aperiodic CQI in the aperiodic CSI; if the aperiodic CQI is larger than the narrowband CQI, determining a preset number of preferred beams selected by the UE according to a preset principle in the aperiodic CSI-RS according to the aperiodic CSI; adding the preset number of preferred beams to the narrow-band CSI-RS, and simultaneously reducing the preset number of standby beams selected by the UE at least in the narrow-band CSI-RS;
the CSI comprises a channel quality indication CQI, a precoding matrix indication PMI and a rank indication RI.
10. The apparatus of claim 9, wherein the channel measurement module is specifically configured to:
and respectively measuring the narrow-band CSI-RS and the aperiodic CSI-RS which are received for the last time to obtain the narrow-band CSI and the aperiodic CSI.
11. The apparatus of claim 9, wherein the CSI determination module further comprises:
a precoding matrix determining unit, configured to determine, when the aperiodic CSI-RS includes at least one narrowband beamforming CSI-RS, a narrowband precoding matrix according to a narrowband RI and a narrowband PMI of the narrowband CSI, and determine an aperiodic precoding matrix according to an aperiodic RI and an aperiodic PMI of the aperiodic CSI;
a codeword determining unit, configured to determine, according to the narrowband precoding matrix and according to a preset principle, a narrowband codeword in an optimal beam direction in the narrowband CSI-RS, and determine, according to the aperiodic precoding matrix and according to the preset principle, an aperiodic codeword in the optimal beam direction in the aperiodic CSI-RS;
the signal-to-noise ratio calculation unit is used for calculating the signal-to-noise ratio of the narrow-band CSI-RS according to the narrow-band code words and calculating the signal-to-noise ratio of the aperiodic CSI-RS according to the aperiodic code words;
the first CSI determining unit is configured to compare a signal-to-noise ratio of the narrowband CSI-RS with a signal-to-noise ratio of the aperiodic CSI-RS, and determine a CSI corresponding to a CSI-RS with a larger signal-to-noise ratio as the CSI reported to the base station.
12. The apparatus of claim 9, further comprising:
and a reporting resource indication configuration module, configured to configure a reporting resource indication for the CSI before reporting the CSI to the base station, so that the base station determines a CSI-RS corresponding to the CSI.
13. The apparatus according to any of claims 9-12, wherein the CSI-RS receiving module is specifically configured to:
when subframe n receives an aperiodic CSI-RS trigger signaling sent by the base station, subframe n + k1Receiving the aperiodic CSI-RS, where k1Is a fixed value and k1E {0,1,2,3,4}, or k1Determined by the subframe configuration of the higher layer parameters.
14. A device for calibrating a beam direction of a reference signal of narrowband channel state information (CSI-RS), configured in a base station, comprising:
the CSI-RS sending module is used for sending a narrow-band channel state information reference signal CSI-RS and an aperiodic CSI-RS to User Equipment (UE);
a CSI receiving module, configured to receive a CSI reported by a UE and based on channel measurement results of the narrowband CSI-RS and the aperiodic CSI-RS and a CSI determined by a type of the aperiodic CSI-RS, where the CSI receiving module includes: when the aperiodic CSI-RS comprises at least one narrow-band beam forming CSI-RS, the CSI-RS with a larger signal-to-noise ratio is calculated according to a preset criterion, and the UE reports the CSI corresponding to the CSI-RS with the larger signal-to-noise ratio; when the aperiodic CSI-RS comprises a non-precoded CSI-RS or a wideband beamforming CSI-RS, reporting both the narrowband CSI and the aperiodic CSI to the base station; the CSI comprises a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI) and a Rank Indicator (RI);
a beam direction calibration module, configured to calibrate a beam direction of the narrowband CSI-RS according to a preset rule when determining that the beam direction of the narrowband CSI-RS needs to be calibrated according to the CSI, including:
a CSI determination unit, configured to determine whether the CSI is aperiodic CSI corresponding to the aperiodic CSI-RS when the aperiodic CSI-RS includes at least one narrowband beamforming CSI-RS; a first preferred beam determining unit, configured to determine, according to the aperiodic CSI, a preset number of preferred beams selected by the UE according to a preset principle in the aperiodic CSI-RS if it is determined that the CSI is the aperiodic CSI; a first beam adjusting unit, configured to add the preset number of preferred beams to the narrowband CSI-RS, and reduce a preset number of spare beams, which are selected by the UE at least, in the narrowband CSI-RS; and
a CQI comparison unit, configured to compare a narrowband CQI in the narrowband CSI reported by the UE with an aperiodic CQI in the aperiodic CSI when the aperiodic CSI-RS includes a non-precoded CSI-RS or a wideband beamforming CSI-RS; a second preferred beam determining unit, configured to determine, according to the aperiodic CSI, a preset number of preferred beams selected by the UE according to a preset rule in the aperiodic CSI-RS if the aperiodic CQI is greater than the narrowband CQI; a second beam adjusting unit, configured to add the preset number of preferred beams to the narrowband CSI-RS, and reduce the preset number of backup beams that are selected by the UE least in the narrowband CSI-RS.
15. The apparatus according to claim 14, wherein the CSI decision unit is specifically configured to:
determining a CSI-RS corresponding to the CSI according to the reporting resource indication configured in the CSI;
and judging whether the CSI is the aperiodic CSI corresponding to the aperiodic CSI-RS or not according to the determination result.
16. The apparatus according to claim 14 or 15, wherein the CSI-RS transmitting module is specifically configured to:
when subframe n sends aperiodic CSI-RS trigger signaling to the UE, subframe n + k1Transmitting the aperiodic CSI-RS, where k1Is a fixed value and k1E {0,1,2,3,4}, or k1Determined by the subframe configuration of the higher layer parameters.
CN201610185916.8A 2016-03-29 2016-03-29 Method and device for calibrating narrow-band channel state information reference signal beam direction Expired - Fee Related CN107241129B (en)

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