CN102468947A - Feedback method and device of channel quality information - Google Patents
Feedback method and device of channel quality information Download PDFInfo
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Abstract
By applying the technical scheme of the embodiment of the invention, the terminal equipment calculates the CQI information under the condition of assuming closed-loop precoding, can more accurately reflect factors such as a receiving processing algorithm and the like at the side of the terminal equipment, and enables a base station to be combined with corresponding CQI information and channel reciprocity processing through the feedback of the CQI information to obtain more accurate channel information so as to carry out more accurate resource scheduling, thereby improving the performance of a system.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for feeding back channel quality information.
Background
Each cell in a wireless cellular network system typically has a base station for communicating with terminals. The types of the terminal include a mobile phone, a notebook, a PDA, and the like. Before the data transmission process starts, the base station transmits reference signals (pilot signals) to the terminal, and the terminal obtains channel estimation values according to the reference signals. A reference signal is a known signal sequence transmitted at a particular frequency at a particular time, as defined. Factors such as interference and noise can affect the quality of the channel estimate.
Terminals are typically located in different geographical locations and may have different received signal strengths and strengths of noise and interference. Thus, some terminals may communicate at a higher rate, such as terminals located at the center of the cell, while other terminals may only communicate at a lower rate, such as terminals at the edge of the cell. In order to fully utilize the transmission bandwidth of a terminal, the data format transmitted to the terminal is preferably matched to the channel condition of the terminal. A technique for matching the data format transmitted to the terminal to its channel condition is called link adaptation.
In an OFDM (Orthogonal Frequency Division Multiplexing) system, multiple symbols may be sent out simultaneously on different subcarriers. The frequency spacing of the subcarriers is just enough to guarantee orthogonality between them. The OFDM modulator converts an input data symbol stream into a plurality of parallel data symbol streams through serial-to-parallel conversion. The output of the serial-to-parallel conversion may be considered as frequency domain data symbols. The subcarriers on both sides of the bandwidth are not used for data transmission, referred to as guard bandwidth. The data symbols on some sub-carriers within the data bandwidth are set as symbols known by the receiving end, and the symbols on these sub-carriers are called pilot symbols. The receiving end can estimate the channel by using the pilot symbols to realize coherent demodulation. The transmitter converts the frequency domain data symbols into time domain signals using an IFFT (Inverse Fast Fourier Transform) Transform. The structure of the IFFT can ensure that the subcarriers are orthogonal. The cyclic prefix is obtained by copying a plurality of sample data at the tail of the time domain symbol to the front end of the time domain signal, and the function of the cyclic prefix is to overcome the interference between symbols. The time domain waveform signal including the cyclic prefix is referred to as an OFDM symbol, which is transmitted by the radio frequency circuit. The OFDM receiver firstly obtains time and frequency synchronization, and then obtains a frequency domain receiving signal through FFT transformation after removing a cyclic prefix from sampled data. The pilot symbols may be used for channel estimation to help recover the data on each subcarrier. The parallel-serial converted data is sent to a decoder for decoding.
The OFDMA technique is a multiple access transmission technique based on the OFDM technique. The frequency resources within the system bandwidth are divided into resource blocks of a certain size, each resource block being the smallest resource unit of the resource allocation in the frequency domain. The OFDMA system schedules different terminals to different resource blocks within the system bandwidth range to realize orthogonal transmission among users.
The 3GPP LTE downlink adopts OFDMA technology, the minimum granularity of the resource of each subframe (1ms) in the time domain is OFDM symbols, and there are 12 or 14 OFDM symbols in each subframe. The smallest granularity in the frequency domain is a subcarrier. The minimum time-frequency unit is defined as a basic resource unit, namely re (resource). The minimum resource allocation unit defined by the LTE system is a Physical Resource Block (PRB). One PRB includes REs corresponding to 12 consecutive subcarriers on all OFDM symbols in one subframe. A terminal may be scheduled on contiguous or non-contiguous physical resource blocks.
The LTE Rel-8 system introduces a closed-loop precoding technology to improve the spectrum efficiency. Closed-loop precoding first requires that a set of the same precoding matrix, called a codebook, be stored at both the base station and the terminal. After estimating the channel information according to the cell common pilot frequency, the terminal selects a pre-coding matrix from the codebook according to a certain criterion. The selected criteria may be maximizing mutual information amount, maximizing output signal-to-interference-and-noise ratio, etc. The terminal feeds back an index of the selected Precoding Matrix in the codebook to the base station through an uplink channel, and the index is recorded as a PMI (Precoding Matrix Indicator). The base station can determine the precoding matrix used by the terminal according to the received index value. The precoding matrix reported by the terminal can be regarded as a quantized value of the channel state information.
In order to help the base station to implement link adaptation, the terminal needs to report Channel Quality Indicator (CQI) according to its Channel condition. The CQI reported by the terminal corresponds to certain time-frequency resources, that is, the CQI reported by the terminal indicates transmission capabilities of the time-frequency resources. The calculation of the CQI requires the terminal to measure the interference I and the noise power N to which it is subjected0An example of a simple and straightforward CQI calculation is:
where P is the received signal power of the terminal. Actually measured by the terminalCan be I + N0And (4) integration.
For systems employing closed-loop precoding transmission, the CQI is calculated based on the selected precoding matrix. Assume that the base station to terminal channel state matrix is:
wherein h isijIs the channel transmission coefficient from the jth antenna of the base station to the ith antenna of the terminal. The terminal selects a precoding matrix from a predefined codebook according to a certain algorithm, and the selected precoding matrix is not recorded as V. Equivalent channels from base station to terminal are denoted as
The terminal may calculate the signal to interference plus noise ratio as follows:
and the terminal transmits the PMI and the CQI obtained by calculation to the base station through an uplink channel. The base station uses the PMI reported by the terminal to preprocess the transmitting terminal, and uses the CQI reported by the terminal to perform link adaptation (including selection of a modulation mode, a coding rate and the like). The terminal reports PMI and CQI, which occupy a large amount of uplink channel bandwidth, cause the resource utilization rate of the uplink channel to be reduced, and introduce quantization error and the like. In the TDD system, uplink and downlink signals are transmitted on the same carrier, and thus reciprocity between uplink and downlink channels is established. Reciprocity means that the uplink channel and the downlink channel are the same. Uplink channels can be estimated by uplink signals sent by the terminal by utilizing reciprocity of the uplink and downlink channels, so that downlink channel information is obtained, a precoding matrix required by downlink transmission is calculated, and a large amount of feedback overhead is saved. The 3GPP LTE R8/R9/R10 and later releases all support transmission schemes that exploit channel reciprocity. However, channel reciprocity does not hold true for interference and noise, i.e. the base station cannot accurately calculate CQI by only relying on channel reciprocity. Therefore, in 3GPP LTE, a terminal is required to report CQI information to assist a base station to implement downlink transmission based on channel reciprocity. Since the precoding matrix for the base station is unknown to the terminal, the CQI cannot be calculated according to (1). LTE specifies that the terminal calculates CQI assuming that the transmission scheme is single-port (single-port) transmission or transmit diversity (multi-port). The CQI calculated based on these two assumptions does not match the actual transmission situation, and the base station needs to make some compensation for the CQI reported by the terminal to apply. The compensation algorithm of the base station cannot be adjusted according to the change of conditions such as the detection algorithm of the terminal, and the performance is damaged. The present invention proposes a solution to this problem.
In implementing the embodiments of the present invention, the applicant finds that the prior art has at least the following problems:
the prior art CQI calculation feedback is based on single port transmission or transmit diversity transmission, and does not match with the actual transmission scheme. The base station also needs to make certain compensation for the CQI reported by the terminal to be applied. The compensation algorithm of the base station cannot be adjusted according to the change of conditions such as the detection algorithm of the terminal and the like, and the performance is limited.
Disclosure of Invention
The embodiment of the invention provides a method and equipment for feeding back channel quality information, which solve the problem of reporting the channel quality information in a transmission scheme based on channel reciprocity in the prior art.
In order to achieve the above object, an aspect of the embodiments of the present invention provides a method for feeding back channel quality information, including:
the terminal equipment determines a channel state matrix from the base station to the terminal equipment according to the received measurement pilot frequency sent by the base station;
the terminal equipment determines at least one precoding matrix according to the channel state matrix and a preset codebook set;
the terminal equipment determines CQI information according to the pre-coding matrix and the channel state matrix;
and the terminal equipment reports the CQI information to the base station.
On the other hand, an embodiment of the present invention further provides a terminal device, including:
the setting module is used for presetting a codebook set;
a receiving module, configured to receive a measurement pilot sent by a base station;
a first determining module, configured to determine, according to the measurement pilot sent by the base station and received by the receiving module, a channel state matrix from the base station to the terminal device;
a second determining module, configured to determine at least one precoding matrix according to the channel state matrix determined by the first determining module and a codebook set preset by the setting module;
a third determining module, configured to determine CQI information according to the precoding matrix determined by the second determining module and the channel state matrix determined by the first determining module;
and a sending module, configured to report the CQI information determined by the third determining module to the base station.
On the other hand, an embodiment of the present invention further provides a method for feeding back channel quality information, including:
a base station receives CQI information and an uplink pilot signal reported by terminal equipment;
the base station determines uplink channel state information through an uplink pilot signal sent by the terminal equipment, and determines downlink channel state information according to channel reciprocity;
the base station performs resource scheduling and transmission mode selection on the terminal equipment according to the CQI information reported by the terminal equipment;
and the base station transmits downlink data to the terminal equipment on the corresponding resources of the terminal equipment according to the transmission mode.
On the other hand, an embodiment of the present invention further provides a base station, including:
a receiving module, configured to receive CQI information and an uplink pilot signal reported by a terminal device;
a determining module, configured to determine uplink channel state information according to the uplink pilot signal sent by the terminal device and received by the receiving module, and determine downlink channel state information according to channel reciprocity;
the scheduling module is used for scheduling resources and selecting a transmission mode for the terminal equipment according to the CQI information reported by the terminal equipment and received by the receiving module;
and the sending module is used for transmitting downlink data to the terminal equipment on the corresponding resources of the terminal equipment scheduled by the scheduling module according to the transmission mode.
Compared with the prior art, the embodiment of the invention has the following advantages:
by applying the technical scheme of the embodiment of the invention, the terminal equipment calculates the CQI information under the condition of assuming closed-loop precoding, can more accurately reflect factors such as a receiving processing algorithm and the like at the side of the terminal equipment, and enables the base station to combine corresponding CQI information and channel reciprocity processing through the feedback of the CQI information to obtain more accurate channel information so as to carry out more accurate resource scheduling, thereby improving the performance of the system.
Drawings
Fig. 1 is a schematic flowchart of a channel quality information feedback method on a terminal device side according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a feedback method of channel quality information at a base station according to an embodiment of the present invention;
fig. 3 is a schematic flowchart of a method for feeding back channel quality information in a specific application scenario according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a terminal device according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a base station according to an embodiment of the present invention.
Detailed Description
As described in the background art, in the prior art, the CQI calculated by the terminal device and fed back to the base station is based on single-port transmission or transmit diversity transmission, so that the base station can only obtain CQI that is not matched with an actual transmission scheme, and thus new quality information cannot be accurately obtained.
In order to solve the problem, the embodiment of the present invention provides a method for feeding back channel quality information, in which a terminal device calculates CQI information under the assumption of closed loop and coding, so that more accurate CQI information can be fed back to a base station, and the base station can acquire more accurate channel state information.
As shown in fig. 1, a schematic flow chart of a feedback method of channel quality information according to an embodiment of the present invention specifically includes the following steps:
step S101, the terminal equipment determines a channel state matrix from the base station to the terminal equipment according to the received measurement pilot frequency sent by the base station.
In an actual application scenario, the specific processing procedure in this step is as follows:
the terminal device estimates a channel state matrix H from the base station to the terminal device according to the received measurement pilot frequency sent by the base station as follows:
step S102, the terminal equipment determines at least one precoding matrix according to the channel state matrix and a preset codebook set.
In an actual application scenario, the specific processing procedure in this step is as follows:
the terminal equipment sets C ═ V according to a preset codebook1，V2，...，VNAnd determining at least one precoding matrix V according to the following formula:
it should be noted that the above formula is only an example selected for convenience of description in the embodiment of the present invention, and in practical applications, the content of the above formula may be adjusted as needed, and all the formulas or algorithms for determining the precoding matrix according to the channel state matrix and the preset codebook set should belong to the protection scope of the present invention.
Step S103, the terminal equipment determines CQI information according to the pre-coding matrix and the channel state matrix, and the specific processing procedure of the step comprises the following steps:
the terminal equipment determines a signal-to-noise ratio according to the determined at least one pre-coding matrix;
and the terminal equipment maps the signal-to-noise ratio to determine a value of the CQI information.
In a specific application scenario, the terminal device determines, according to the determined at least one precoding matrix, a signal-to-noise ratio SINR according to the following formula:
wherein,
h is a channel state matrix from the base station to the terminal equipment determined by the terminal equipment, and V is a precoding matrix determined by the terminal equipment
I is the interference suffered by the terminal equipment;
N0the noise power experienced by the terminal device.
It should be noted that the above formula is only an example selected for convenience of description in the embodiment of the present invention, and in practical applications, the content of the above formula may be adjusted as needed, and all the formulas or algorithms for determining the signal-to-noise ratio and the CQI information according to the precoding matrix and the channel state matrix should belong to the protection scope of the present invention.
It should be further noted that, in this step, the terminal device actually assumes that the base station is currently performing downlink data transmission by applying the precoding matrix selected in step S102, and in this case, since the precoding matrix is obtained according to information such as measurement pilot frequency actually sent by the base station, the terminal device does not determine CQI information based on a scheme that is not matched with an actual transmission scheme, such as single-port transmission or transmit diversity transmission, and thus the defect in the prior art is avoided.
And step S104, the terminal equipment reports the CQI information to the base station.
After this step is completed, the technical solution proposed in this embodiment further includes:
and the terminal equipment receives downlink data transmitted by the base station on corresponding resources according to the transmission mode determined according to the CQI information.
In combination with a specific application scenario, the processing procedure is actually that the terminal device receives downlink data transmitted by the base station on the time domain resource allocated to the terminal device by using the MCS determined according to the CQI information.
It should be further noted that, after the channel state matrix is determined in step S101, in a specific application scenario, the terminal device may further determine RI information, and according to a value of the determined RI information, in step S103, the CQI information determined by the terminal device includes the following two cases:
if the value of the RI information is greater than 1, the terminal device determines a plurality of CQI information, and if the value of the RI information is equal to 1, the terminal device determines 1 CQI information.
Accordingly, in this case, the terminal device reports the RI information and the CQI information together to the base station in step S104.
Compared with the prior art, the CQI information fed back to the base station by the terminal equipment is more accurate, so the CQI information can be used for determining the channel state information through channel reciprocity at the base station side and realizing information reference in the corresponding resource scheduling process, so that the base station determines the final resource scheduling scheme according to the information closer to the actual transmission state and selects a more proper MCS scheme.
The above process is an implementation flow of the feedback method of channel quality information on the terminal device side according to the embodiment of the present invention, and accordingly, the embodiment of the present invention further provides an implementation flow of the technical solution on the base station side, a flow diagram of which is shown in fig. 2, and specifically includes the following steps:
step S201, the base station receives CQI information and uplink pilot signals reported by the terminal equipment.
Step S202, the base station determines the uplink channel state information through the uplink pilot signal sent by the terminal equipment, and determines the downlink channel state information according to the channel reciprocity.
After the step is completed, the technical scheme further comprises the following processing procedures:
specifically, in an actual application scenario, in such a processing procedure, the base station determines the precoding matrix by performing singular value decomposition on the channel state matrix corresponding to the downlink channel state information.
Step S203, the base station performs resource scheduling and transmission mode selection on the terminal equipment according to the CQI information reported by the terminal equipment.
The specific processing content is that the base station performs frequency domain selective resource scheduling and MCS selection on the terminal equipment according to the CQI information reported by the terminal equipment.
Step S204, the base station transmits downlink data to the terminal equipment on the corresponding resources of the terminal equipment according to the transmission mode.
Corresponding to the foregoing embodiment where the terminal device further determines the RI information, in step S201, the base station may also receive the RI information reported by the terminal device.
On one hand, if the value of the RI information is equal to 1, the number of the CQI information reported by the terminal device received by the base station should be 1, and if the value of the RI information is greater than 1, the number of the CQI information reported by the terminal device received by the base station should be multiple.
On the other hand, the base station may also determine the transmission condition of the parallel downlink data according to the value of the RI information, that is, the base station further determines the number of data streams for downlink parallel transmission according to the RI information and the determined downlink channel state information, and transmits the downlink data to the terminal device according to the determined number of data streams.
It should be noted that, if the base station does not receive the RI information reported by the terminal device, the base station may also determine the corresponding RI information through the uplink channel information and other related information sent by the terminal device, and such a change is also applicable to the protection scope of the present invention.
Compared with the prior art, the embodiment of the invention has the following advantages:
by applying the technical scheme of the embodiment of the invention, the terminal equipment calculates the CQI information under the condition of assuming closed-loop precoding, can more accurately reflect factors such as a receiving processing algorithm and the like at the side of the terminal equipment, and enables the base station to combine corresponding CQI information and channel reciprocity processing through the feedback of the CQI information to obtain more accurate channel information so as to carry out more accurate resource scheduling, thereby improving the performance of the system.
The technical solution proposed in the embodiment of the present invention is described below with reference to specific application scenarios.
As shown in fig. 3, a schematic flow chart of a feedback method of channel quality information according to an embodiment of the present invention specifically includes the following steps:
step S301, the terminal device estimates a channel state matrix H from the base station to the terminal device according to a measurement pilot frequency (CSI-RS) sent by the base station.
Wherein,
step S302, the terminal device selects from a predefined codebook set C ═ V1，V2，...，VNSelecting one or more precoding matrixes V:
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step S303, the terminal device assumes that the base station applies the selected precoding matrix to transmit downlink data, calculates the signal to interference plus noise ratio SINR, and maps the calculated SINR to a CQI value.
Wherein,
and step S304, the terminal equipment transmits the calculated CQI value to the base station through an uplink channel, and the base station receives the CQI information reported by the terminal equipment.
Step S305, the base station obtains uplink channel state information by using the uplink pilot signal sent by the terminal device, and obtains downlink channel state information by channel reciprocity.
The base station calculates a precoding matrix according to the downlink channel state information, the precoding matrix is not limited in a codebook, and the precoding matrix can be obtained by performing singular value decomposition on the channel state matrix (right singular vector of the channel).
Step S306, the base station utilizes the CQI information reported by the terminal equipment to carry out frequency domain selective scheduling and MCS selection.
And step S307, the base station transmits data to the terminal equipment by using the calculated MCS and the precoding matrix on the time-frequency resources allocated to the terminal equipment.
Compared with the prior art, the CQI information fed back to the base station by the terminal equipment is more accurate, so the CQI information can be used for determining the channel state information through channel reciprocity at the base station side and realizing information reference in the corresponding resource scheduling process, so that the base station determines the final resource scheduling scheme according to the information closer to the actual transmission state and selects a more proper MCS scheme.
Compared with the prior art, the embodiment of the invention has the following advantages:
by applying the technical scheme of the embodiment of the invention, the terminal equipment calculates the CQI information under the condition of assuming closed-loop precoding, can more accurately reflect factors such as a receiving processing algorithm and the like at the side of the terminal equipment, and enables the base station to combine corresponding CQI information and channel reciprocity processing through the feedback of the CQI information to obtain more accurate channel information so as to carry out more accurate resource scheduling, thereby improving the performance of the system.
In order to implement the technical solution of the embodiment of the present invention, an embodiment of the present invention further provides a terminal device, a schematic structural diagram of which is shown in fig. 4, and the terminal device specifically includes:
a setting module 41, configured to preset a codebook set;
a receiving module 42, configured to receive a measurement pilot sent by a base station;
a first determining module 43, configured to determine a channel state matrix from the base station to the terminal device according to the measurement pilot sent by the base station and received by the receiving module 42;
a second determining module 44, configured to determine at least one precoding matrix according to the channel state matrix determined by the first determining module 43 and the codebook set preset by the setting module 41;
a third determining module 45, configured to determine CQI information according to the precoding matrix determined by the second determining module 44;
a sending module 46, configured to report the CQI information determined by the third determining module 45 to the base station.
The second determining module 44 is specifically configured to:
according to codebook set C ═ { V ═ preset by setting module 411，V2，...，VNAnd the channel state matrix H estimated by the first determining module 43, determining at least one precoding matrix V according to the following formula:
on the other hand, the third determining module 45 is specifically configured to:
determining a signal-to-noise ratio based on the at least one pre-coding matrix determined by the second determining module 44;
and mapping the signal-to-noise ratio to determine a value of the CQI information.
It should be noted that, in this process, the third determining module 45 determines the signal-to-noise ratio SINR according to the following formula:
wherein,
h is the base station to terminal device channel state matrix determined by the terminal device,
v is a precoding matrix determined by the terminal equipment
I is the interference suffered by the terminal equipment;
N0the noise power experienced by the terminal device.
Further, the receiving module 42 is further configured to:
and receiving downlink data transmitted on the resource determined by the base station according to the CQI determined by the third determining module 45.
In a specific application scenario, the receiving module 42 is specifically configured to:
and receiving downlink data transmitted by the base station on the time domain resource allocated to the terminal equipment by using the MCS determined according to the CQI information determined by the third determining module 45.
In another specific application scenario, the second determining module 44 is further configured to determine the RI information according to the channel state matrix determined by the first determining module 43.
Correspondingly, the third determining module 45 is specifically configured to determine CQI information according to the channel state matrix determined by the first determining module 43, and the precoding matrix and RI information determined by the second determining module 44;
wherein the third determining module 45 determines a plurality of CQI information if the value of the RI information determined by the second determining module 44 is greater than 1, and the third determining module 45 determines 1 CQI information if the value of the RI information determined by the second determining module 44 is equal to 1.
Further, the sending module 46 is specifically configured to report the RI information determined by the second determining module 44 and the CQI information determined by the third determining module 45 to the base station.
On the other hand, an embodiment of the present invention further provides a base station, a schematic structural diagram of which is shown in fig. 5, and the base station includes:
a receiving module 51, configured to receive CQI information and an uplink pilot signal reported by a terminal device;
a determining module 52, configured to determine uplink channel state information according to the uplink pilot signal sent by the terminal device and received by the receiving module 51, and determine downlink channel state information according to channel reciprocity;
a scheduling module 53, configured to perform resource scheduling and selection of a transmission mode on the terminal device according to the CQI information reported by the terminal device and received by the receiving module 51;
a sending module 54, configured to transmit downlink data to the terminal device according to the transmission mode on the resource corresponding to the terminal device scheduled by the scheduling module 53.
Further, the determining module 52 is further configured to:
after determining the downlink channel state information, a precoding matrix is determined according to the downlink channel state information.
In an actual application scenario, the determining module 52 is specifically configured to:
and performing singular value decomposition on a channel state matrix corresponding to the downlink channel state information to determine a precoding matrix.
Further, the scheduling module 53 is specifically configured to:
according to the CQI information reported by the terminal device received by the receiving module 51, frequency domain selective resource scheduling and MCS selection are performed on the terminal device.
In a specific application scenario, the receiving module 51 is further configured to receive RI information reported by the terminal device.
When the receiving module 51 receives the RI information reported by the terminal device,
if the value of the RI information reported by the terminal device received by the receiving module 51 is greater than 1, the receiving module 51 receives a plurality of CQI information reported by the terminal device, and if the value of the RI information reported by the terminal device received by the receiving module 51 is equal to 1, the receiving module 51 receives 1 CQI information reported by the terminal device.
Further, the determining module 52 is further configured to determine the number of data streams for downlink parallel transmission according to the RI information and the downlink channel state information received by the receiving module 51;
the sending module 54 is further configured to transmit downlink data to the terminal device according to the number of data streams determined by the determining module 52.
It should be noted that, if the base station does not receive the RI information reported by the terminal device, the base station may also determine the corresponding RI information through the uplink channel information and other related information sent by the terminal device, and such a change is also applicable to the protection scope of the present invention.
Compared with the prior art, the embodiment of the invention has the following advantages:
by applying the technical scheme of the embodiment of the invention, the terminal equipment calculates the CQI information under the condition of assuming closed-loop precoding, can more accurately reflect factors such as a receiving processing algorithm and the like at the side of the terminal equipment, and enables the base station to combine corresponding CQI information and channel reciprocity processing through the feedback of the CQI information to obtain more accurate channel information so as to carry out more accurate resource scheduling, thereby improving the performance of the system.
Through the above description of the embodiments, it is clear to those skilled in the art that the embodiments of the present invention may be implemented by hardware, or by software plus a necessary general hardware platform. Based on such understanding, the technical solution of the embodiment of the present invention may be embodied in the form of a software product, which may be stored in a non-volatile storage medium (which may be a CD-ROM, a usb disk, a removable hard disk, etc.), and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the various implementation scenarios of the embodiment of the present invention.
Those skilled in the art will appreciate that the figures are merely schematic representations of one preferred implementation scenario and that the blocks or flow diagrams in the figures are not necessarily required to implement embodiments of the present invention.
Those skilled in the art will appreciate that the modules in the devices in the implementation scenario may be distributed in the devices in the implementation scenario according to the description of the implementation scenario, or may be located in one or more devices different from the present implementation scenario with corresponding changes. The modules of the implementation scenario may be combined into one module, or may be further split into a plurality of sub-modules.
The sequence numbers of the embodiments of the present invention are only for description, and do not represent the advantages and disadvantages of the implementation scenarios.
The above disclosure is only a few specific implementation scenarios of the embodiments of the present invention, but the embodiments of the present invention are not limited thereto, and any variations that can be considered by those skilled in the art should fall within the scope of the business limitations of the embodiments of the present invention.
Claims (32)
1. A method for feeding back channel quality information, comprising:
the terminal equipment determines a channel state matrix from the base station to the terminal equipment according to the received measurement pilot frequency sent by the base station;
the terminal equipment determines at least one precoding matrix according to the channel state matrix and a preset codebook set;
the terminal equipment determines CQI information according to the pre-coding matrix and the channel state matrix;
and the terminal equipment reports the CQI information to the base station.
2. The method of claim 1, wherein the determining, by the terminal device, at least one precoding matrix according to the channel state matrix and a preset codebook set specifically includes:
the terminal equipment sets C ═ V according to a preset codebook1，V2，...，VNAnd determining at least one precoding matrix V according to the following formula:
3. the method of claim 1, wherein the determining, by the terminal device, the CQI information according to the precoding matrix and the channel state matrix specifically comprises:
the terminal equipment determines a signal-to-noise ratio according to the determined at least one precoding matrix and the channel state matrix;
and the terminal equipment maps the signal-to-noise ratio to determine a value of CQI information.
4. The method of claim 3, wherein the terminal device determines the signal to noise ratio, SINR, according to the following formula based on the determined at least one precoding matrix and the channel state matrix:
wherein,
h is a channel state matrix from the base station to the terminal equipment determined by the terminal equipment, and V is a precoding matrix determined by the terminal equipment
I is the interference suffered by the terminal equipment;
N0the noise power received by the terminal equipment.
5. The method of claim 1, wherein after the terminal device reports the CQI information to the base station, the method further comprises:
and the terminal equipment receives downlink data transmitted by the base station on corresponding resources according to the transmission mode determined according to the CQI information.
6. The method of claim 5, wherein the receiving, by the terminal device, the downlink data transmitted by the base station on the corresponding resource according to the transmission mode determined according to the CQI information specifically includes:
and the terminal equipment receives downlink data transmitted by the base station on the time domain resource allocated to the terminal equipment by using the MCS determined according to the CQI information.
7. The method as claimed in claim 1, wherein after the terminal device determines the channel state matrix from the base station to the terminal device according to the received measurement pilot sent by the base station, further comprising:
and the terminal equipment determines RI information according to the channel state matrix.
8. The method of claim 7, wherein the determining, by the terminal device, the CQI information according to the precoding matrix and the channel state matrix specifically comprises:
the terminal equipment determines CQI information according to the precoding matrix, the channel state matrix and the RI information;
wherein if the value of the RI information is greater than 1, the terminal device determines a plurality of CQI information, and if the value of the RI information is equal to 1, the terminal device determines 1 CQI information.
9. The method of claim 8, wherein the reporting, by the terminal device, the CQI information to the base station specifically comprises:
and the terminal equipment reports the RI information and the CQI information to the base station.
10. A terminal device, comprising:
the setting module is used for presetting a codebook set;
a receiving module, configured to receive a measurement pilot sent by a base station;
a first determining module, configured to determine, according to the measurement pilot sent by the base station and received by the receiving module, a channel state matrix from the base station to the terminal device;
a second determining module, configured to determine at least one precoding matrix according to the channel state matrix determined by the first determining module and a codebook set preset by the setting module;
a third determining module, configured to determine CQI information according to the precoding matrix determined by the second determining module and the channel state matrix determined by the first determining module;
and a sending module, configured to report the CQI information determined by the third determining module to the base station.
11. The terminal device of claim 10, wherein the second determining module is specifically configured to:
according to codebook set C ═ { V preset by the setting module1，V2，...，VNAnd determining at least one precoding matrix V according to the following formula, wherein the channel state matrix H is estimated by the first determining module:
12. the terminal device of claim 10, wherein the third determining module is specifically configured to:
determining a signal-to-noise ratio according to the at least one precoding matrix determined by the second determining module and the channel state matrix determined by the first determining module;
and mapping the signal-to-noise ratio to determine a value of CQI information.
13. The terminal device of claim 12, wherein the third determining module determines the signal to noise ratio SINR according to the following formula:
wherein,
h is a channel state matrix from the base station to the terminal equipment determined by the terminal equipment, and V is a precoding matrix determined by the terminal equipment
I is the interference suffered by the terminal equipment;
N0the noise power received by the terminal equipment.
14. The terminal device of claim 10, wherein the receiving module is further configured to:
and receiving downlink data transmitted on the resource determined by the base station according to the CQI information determined by the third determining module.
15. The terminal device of claim 14, wherein the receiving module is specifically configured to:
and receiving downlink data transmitted by the base station on the time domain resource allocated to the terminal equipment by using the MCS determined according to the CQI information determined by the third determining module.
16. The terminal device of claim 10, wherein the second determining module is further configured to:
and determining RI information according to the channel state matrix determined by the first determining module.
17. The terminal device of claim 16, wherein the third determining module is specifically configured to:
determining CQI information according to the channel state matrix determined by the first determining module, and the precoding matrix and RI information determined by the second determining module;
wherein the third determining module determines a plurality of CQI information if the value of the RI information determined by the second determining module is greater than 1, and determines 1 CQI information if the value of the RI information determined by the second determining module is equal to 1.
18. The terminal device of claim 17, wherein the sending module is specifically configured to:
and reporting the RI information determined by the second determination module and the CQI information determined by the third determination module to the base station.
19. A method for feeding back channel quality information, comprising:
a base station receives CQI information and an uplink pilot signal reported by terminal equipment;
the base station determines uplink channel state information through an uplink pilot signal sent by the terminal equipment, and determines downlink channel state information according to channel reciprocity;
the base station performs resource scheduling and transmission mode selection on the terminal equipment according to the CQI information reported by the terminal equipment;
and the base station transmits downlink data to the terminal equipment on the corresponding resources of the terminal equipment according to the transmission mode.
20. The method of claim 19, wherein after the base station determines the uplink channel state information through the uplink pilot signal transmitted by the terminal device and determines the downlink channel state information according to channel reciprocity, the method further comprises:
and the base station determines a precoding matrix according to the downlink channel state information.
21. The method of claim 20, wherein the base station determines a precoding matrix according to the downlink channel state information, and specifically comprises:
and the base station carries out singular value decomposition on a channel state matrix corresponding to the downlink channel state information to determine a precoding matrix.
22. The method of claim 19, wherein the base station performs resource scheduling and transmission mode selection on the terminal device according to the CQI reported by the terminal device, specifically:
and the base station performs frequency domain selective resource scheduling and MCS selection on the terminal equipment according to the CQI information reported by the terminal equipment.
23. The method of claim 19, wherein in the process of the base station receiving the CQI information and the uplink pilot signal reported by the terminal device, the method further comprises:
and the base station receives the RI information reported by the terminal equipment.
24. The method of claim 23, wherein when the base station receives the RI information reported by the terminal device, the method further comprises:
if the value of the RI information reported by the terminal equipment received by the base station is greater than 1, the base station receives a plurality of CQI information reported by the terminal equipment, and if the value of the RI information reported by the terminal equipment received by the base station is equal to 1, the base station receives 1 CQI information reported by the terminal equipment.
25. The method of claim 24, wherein the base station transmits downlink data to the terminal device on a resource corresponding to the terminal device according to the transmission mode, specifically comprising:
and the base station determines the number of data streams transmitted in parallel in the downlink according to the RI information and the downlink channel state information, and transmits downlink data to the terminal equipment according to the determined number of the data streams.
26. A base station, comprising:
a receiving module, configured to receive CQI information and an uplink pilot signal reported by a terminal device;
a determining module, configured to determine uplink channel state information according to the uplink pilot signal sent by the terminal device and received by the receiving module, and determine downlink channel state information according to channel reciprocity;
the scheduling module is used for scheduling resources and selecting a transmission mode for the terminal equipment according to the CQI information reported by the terminal equipment and received by the receiving module;
and the sending module is used for transmitting downlink data to the terminal equipment on the corresponding resources of the terminal equipment scheduled by the scheduling module according to the transmission mode.
27. The base station of claim 26, wherein the determining module is further configured to:
after determining downlink channel state information, determining a precoding matrix according to the downlink channel state information.
28. The base station of claim 27, wherein the determining module is specifically configured to:
and performing singular value decomposition on a channel state matrix corresponding to the downlink channel state information to determine a precoding matrix.
29. The base station of claim 27, wherein the scheduling module is specifically configured to:
and performing frequency domain selective resource scheduling and MCS selection on the terminal equipment according to the CQI information reported by the terminal equipment and received by the receiving module.
30. The base station of claim 26, wherein the receiving module is further configured to:
and receiving the RI information reported by the terminal equipment.
31. The base station of claim 30, wherein when the receiving module receives the RI information reported by the terminal equipment,
if the value of the RI information reported by the terminal equipment received by the receiving module is greater than 1, the receiving module receives a plurality of CQI information reported by the terminal equipment, and if the value of the RI information reported by the terminal equipment received by the receiving module is equal to 1, the receiving module receives 1 CQI information reported by the terminal equipment.
32. The base station of claim 31,
the determining module is further configured to determine the number of data streams for downlink parallel transmission according to the RI information received by the receiving module and the downlink channel state information;
the sending module is further configured to transmit downlink data to the terminal device according to the number of data streams determined by the determining module.
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