WO2018171482A1

WO2018171482A1 - Method for acquiring channel state information, terminal and network-side device

Info

Publication number: WO2018171482A1
Application number: PCT/CN2018/078997
Authority: WO
Inventors: 塔玛拉卡拉盖施; 高秋彬
Original assignee: 电信科学技术研究院有限公司
Priority date: 2017-03-24
Filing date: 2018-03-14
Publication date: 2018-09-27
Also published as: CN108631844B; CN108631844A

Abstract

Provided are a method for acquiring channel state information, a terminal, and a network-side device. The method comprises: a terminal measures a downlink reference signal sent by a network-side device, and reports to the network-side device N channel ranks according to a measurement result; the terminal receives a target precoding matrix index (PMI) sent by the network-side device corresponding to M target channel ranks in the N channel ranks; and according to the M target channel ranks and a precoding matrix corresponding to the target PMI that corresponds to the M target channel ranks, the terminal computes M corresponding channel quality indicators (CQIs), respectively.

Description

Method, terminal and network side device for acquiring channel state information

Cross-reference to related applications

Priority is claimed on Japanese Patent Application No. 201710183576.X filed on Jan. 24,,,,,,,,,,

Technical field

The present disclosure relates to the field of communications technologies, and in particular, to a method, a terminal, and a network side device for acquiring channel state information.

Background technique

In a multiple-input multiple-output (MIMO) system, the terminal needs to feed back channel state information (CSI) to the base station, and the base station uses the channel state information reported by the terminal to perform precoding and adjustment of data. The coding rate is matched to the current channel environment of the terminal. In non-codebook MIMO, the terminal does not feed back a Precoding Matrix Indicator (PMI) to save uplink feedback overhead. In this way, the terminal cannot calculate the Channel Quality Indicator (CQI) according to the PMI. Currently, in a Long Term Evolution (LTE) system, a terminal calculates a CQI value on the assumption that downlink data is transmitted in a transmit diversity manner. However, the CQI obtained based on the above assumptions may not accurately represent the true channel quality. It can be seen that the method for obtaining channel state information in the existing non-codebook MIMO system has a problem that the CQI value calculated by the terminal is not accurate enough.

Summary of the invention

An object of the present disclosure is to provide a method, a terminal, and a network side device for acquiring channel state information to solve the problem that the CQI value calculated by the terminal in the non-codebook MIMO system is not accurate enough.

In order to achieve the above objective, an embodiment of the present disclosure provides a method for acquiring channel state information, including:

The terminal measures the downlink measurement pilots sent by the network side device, and reports N channel ranks to the network side device according to the measurement result, where the N is an integer greater than or equal to 1;

Receiving, by the network side device, a target precoding matrix index corresponding to M target channel ranks of the N channel ranks, where the M is an integer greater than or equal to 1, and the N is greater than or equal to M;

The terminal respectively calculates corresponding M channel quality indexes according to the M target channel ranks and the precoding matrix corresponding to the target precoding matrix index corresponding to the M target channel ranks.

Optionally, the method further includes:

The terminal sends an uplink sounding pilot to the network side device, where the uplink sounding pilot is used for measurement by the network side device, and determines a target precoding matrix index corresponding to the M target channel ranks according to the measurement result. .

Optionally, if the N is equal to 1, the M is equal to 1, the uplink sounding pilot is used for measurement by the network side device, and determining target precoding corresponding to the M target channel ranks according to the measurement result. Matrix index

If the N is greater than 1, the M is greater than or equal to 1, the uplink sounding pilot is used for measurement by the network side device, and the M target channel ranks of the N channel ranks are determined according to the measurement result, And a target precoding matrix index corresponding to the M target channel ranks.

Optionally, if the data transmission mode assumed by the network side device is the first transmission mode, the terminal according to the M target channel ranks and the target precoding matrix index corresponding to the M target channel ranks The coding matrix calculates the corresponding M channel quality indexes.

Optionally, if the assumed data transmission mode of the network side device is the second transmission mode, the number of target precoding matrix indexes corresponding to the M target channel ranks is Y, and the Y is equal to the positive of M. Integer multiple

The method further includes:

Obtaining, by the terminal, a precoding matrix cyclic manner corresponding to each target channel rank of the M target channel ranks;

The terminal calculates a corresponding M channel quality index according to the M target channel ranks and the precoding matrix of the target precoding matrix index corresponding to the M target channel ranks, including:

And the terminal calculates, according to the M target channel ranks, a precoding matrix of the target precoding matrix index corresponding to the M target channel ranks, and the precoding matrix cyclic manner corresponding to each target channel rank, respectively M channel quality indices.

Optionally, the method further includes:

The terminal reports the M channel quality indexes to the network side device, where the M channel quality indexes are used by the network side device according to the M target channel ranks and the M channel quality indexes. And a precoding matrix of the target precoding matrix index corresponding to the M target channel ranks, and transmitting downlink data to the terminal.

The embodiment of the present disclosure further provides a method for acquiring channel state information, including:

The network side device sends a downlink measurement pilot to the terminal, and accepts N channel ranks reported by the terminal, where the downlink measurement pilot is used for measurement by the terminal, and the N channel ranks are based on the terminal Determining a channel rank determined by measurement of a downlink measurement pilot, where N is an integer greater than or equal to 1;

Determining, by the network side device, a target precoding matrix index corresponding to M target channel ranks of the N channel ranks;

The network side device sends the target precoding matrix index corresponding to the M target channel ranks to the terminal, where the target precoding matrix index corresponding to the M target channel ranks is used for calculation by the terminal M channel quality indexes corresponding to the M target channel ranks; the M is an integer greater than or equal to 1, and the N is greater than or equal to M.

Optionally, the method further includes:

Receiving, by the network side device, an uplink sounding pilot sent by the terminal;

Determining, by the network side device, a target precoding matrix index corresponding to M target channel ranks of the N channel ranks, including:

The network side device measures the uplink sounding pilot, and determines a target precoding matrix index corresponding to the M target channel ranks according to the measurement result.

Optionally, if the N is equal to 1, the M is equal to 1, the network side device measures the uplink sounding pilot, and determines a target precoding matrix index corresponding to the M target channel ranks according to the measurement result. ;

If the N is greater than 1, and the M is greater than or equal to 1, the network side device determines a target precoding matrix index corresponding to the M target channel ranks of the N channel ranks, including:

The network side device measures the uplink sounding pilot, and determines M target channel ranks of the N channel ranks according to the measurement result, and a target precoding matrix index corresponding to the M target channel ranks.

Optionally, if the data transmission mode of the network side device is the first transmission mode, the network side device determines a target precoding matrix index corresponding to the M target channel ranks of the N channel ranks.

Optionally, if the data transmission mode of the network side device is the second transmission mode, the number of target precoding matrix indexes corresponding to the M target channel ranks is Y, and the Y is equal to a positive integer multiple of M. ;

Transmitting, by the network side device, a precoding matrix cyclic manner corresponding to a target precoding matrix index corresponding to each target channel rank of the M target channel ranks, and the preamble corresponding to each target channel rank The coding matrix cyclic mode is used for the terminal to calculate corresponding M channel quality indexes.

Optionally, the method further includes:

Receiving, by the network side device, the M channel quality indexes reported by the terminal;

The network side device transmits downlink data to the terminal according to the M target channel ranks and the M channel quality indexes, and a precoding matrix of a target precoding matrix index corresponding to the M target channel ranks.

The embodiment of the present disclosure further provides a terminal, including:

a sending module, configured to measure a downlink measurement pilot sent by the network side device, and report N channel ranks to the network side device according to the measurement result, where the N is an integer greater than or equal to 1;

a receiving module, configured to receive, by the network side device, a target precoding matrix index corresponding to M target channel ranks of the N channel ranks, where the M is an integer greater than or equal to 1, and the N is greater than Or equal to M;

The calculation module is configured to calculate corresponding M channel quality indexes according to the M target channel ranks and the precoding matrix corresponding to the target precoding matrix index corresponding to the M target channel ranks.

Optionally, the sending module is configured to send an uplink sounding pilot to the network side device, where the uplink sounding pilot is used for measurement by the network side device, and determine the M target channel ranks according to the measurement result. Corresponding target precoding matrix index.

Optionally, if the data transmission mode assumed by the network side device is the first transmission mode, the calculation module is configured to use, according to the M target channel ranks, a target precoding matrix corresponding to the M target channel ranks. The precoding matrix of the index calculates the corresponding M channel quality indexes.

The terminal further includes an obtaining module, configured to acquire a precoding matrix cyclic manner corresponding to each target channel rank of the M target channel ranks;

The calculation module is configured to: according to the M target channel ranks, a precoding matrix of a target precoding matrix index corresponding to the M target channel ranks, and a precoding matrix cyclic manner corresponding to each target channel rank, The corresponding M channel quality indexes are respectively calculated.

Optionally, the sending module is configured to report the M channel quality indexes to the network side device, where the M channel quality indexes are used by the network side device according to the M target channel rank sums Determining a matrix of M channel quality indices and a precoding matrix of a target precoding matrix index corresponding to the M target channel ranks, and transmitting downlink data to the terminal.

The embodiment further provides a network side device, including:

a receiving module, configured to send a downlink measurement pilot to the terminal, and accept N channel ranks reported by the terminal, where the downlink measurement pilot is used for measurement by the terminal, where the N channel ranks are based on the terminal a channel rank determined by the measurement of the downlink measurement pilot, where N is an integer greater than or equal to 1;

a determining module, configured to determine a target precoding matrix index corresponding to M target channel ranks of the N channel ranks;

a sending module, configured to send, to the terminal, the target precoding matrix index corresponding to the M target channel ranks, where a target precoding matrix index corresponding to the M target channel ranks is used for calculation by the terminal M channel quality indexes corresponding to the M target channel ranks; the M is an integer greater than or equal to 1, and the N is greater than or equal to M.

Optionally, the receiving module is configured to receive an uplink sounding pilot sent by the terminal;

The determining module is configured to measure the uplink sounding pilot, and determine a target precoding matrix index corresponding to the M target channel ranks according to the measurement result.

Optionally, if the N is equal to 1, the M is equal to 1, the determining module is configured to measure the uplink sounding pilot, and determine a target precoding matrix corresponding to the M target channel ranks according to the measurement result. index;

If the N is greater than 1, the M is greater than or equal to 1, the determining module is configured to measure the uplink sounding pilot, and determine, according to the measurement result, M target channel ranks of the N channel ranks, and a target precoding matrix index corresponding to the M target channel ranks.

Optionally, if the data transmission mode of the network side device is the first transmission mode, the determining module is configured to determine a target precoding matrix index corresponding to the M target channel ranks of the N channel ranks.

The sending module is configured to send, to the terminal, a precoding matrix cyclic manner corresponding to a target precoding matrix index corresponding to each target channel rank of the M target channel ranks, where each target channel rank corresponds to the The precoding matrix cyclic mode is used for the terminal to calculate corresponding M channel quality indexes.

Optionally, the receiving module is configured to receive the M channel quality indexes reported by the terminal;

The sending module is configured to transmit downlink data to the terminal according to the M target channel ranks and the M channel quality indexes, and a precoding matrix of a target precoding matrix index corresponding to the M target channel ranks. .

The embodiment of the present disclosure further provides a terminal, including: a processor, a transceiver, a memory, a user interface, and a bus interface, where:

The processor is configured to read a program in the memory, and perform the steps in the method for acquiring channel state information corresponding to the terminal side provided by the embodiment of the present disclosure.

The embodiment of the present disclosure further provides a network side device, including: a processor, a transceiver, a memory, a user interface, and a bus interface, where:

The processor is configured to read a program in the memory, and perform the steps in the method for acquiring channel state information corresponding to the network side device side provided by the embodiment of the present disclosure.

The embodiment of the present disclosure further provides a computer readable storage medium, where the computer program is stored, and when the computer program is executed by the processor, the steps in the method for acquiring channel state information corresponding to the terminal side provided by the embodiment of the present disclosure are implemented. .

The embodiment of the present disclosure further provides a computer readable storage medium, where the computer program is executed by the processor, and the method for acquiring channel state information corresponding to the network side device provided by the embodiment of the present disclosure is implemented. step.

The above technical solutions of the present disclosure have at least the following beneficial effects:

In the embodiment of the present disclosure, the terminal measures the downlink measurement pilots sent by the network side device, and reports N channel ranks to the network side device according to the measurement result; the terminal receives the N channels sent by the network side device a target precoding matrix index corresponding to the M target channel ranks in the rank; the terminal according to the M target channel ranks, and a precoding matrix corresponding to the target precoding matrix index corresponding to the M target channel ranks, respectively Calculate the corresponding M channel quality indexes. In this way, in the non-codebook MIMO system, the network side device sends the PMI corresponding to the RI according to the channel rank RI reported by the terminal, which can ensure that the CQI value calculated by the terminal is true and accurate. Moreover, the terminal calculates the CQI by using the PMI indicated by the network side device, and when the terminal feeds back the calculated CQI to the network side device, the network side device can achieve the beneficial effect of understanding the CQI fed back by the terminal.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments described in the present disclosure. Other drawings may also be obtained from those of ordinary skill in the art in light of the inventive work. The following figures are not intended to be scaled to scale in actual dimensions, with emphasis on the gist of the present disclosure.

FIG. 1 is a schematic structural diagram of a network applicable to an embodiment of the present disclosure;

2 is a schematic flowchart of a method for acquiring channel state information according to an embodiment of the present disclosure;

FIG. 3 is a schematic structural diagram of an antenna module of a terminal according to an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of a data transmission manner according to an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of another data transmission manner according to an embodiment of the present disclosure;

FIG. 6 is a schematic flowchart diagram of another method for acquiring channel state information according to an embodiment of the present disclosure;

FIG. 7 is a schematic structural diagram of a terminal according to an embodiment of the present disclosure;

FIG. 8 is a second schematic structural diagram of a terminal according to an embodiment of the present disclosure;

FIG. 9 is a schematic structural diagram of a network side device according to an embodiment of the present disclosure;

FIG. 10 is a schematic structural diagram of another terminal according to an embodiment of the present disclosure;

FIG. 11 is a schematic structural diagram of another network side device according to an embodiment of the present disclosure.

detailed description

The technical solutions in the embodiments of the present disclosure are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present disclosure. It is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present disclosure without departing from the inventive scope are the scope of the disclosure.

Referring to FIG. 1 , FIG. 1 is a schematic diagram of a network structure applicable to an embodiment of the present disclosure. As shown in FIG. 1 , the terminal 11 includes a terminal 11 and a network side device 12 . The terminal 11 may be a mobile phone, a tablet (Tablet Personal Computer), and a knee. Terminal-side devices such as laptop computers, personal digital assistants (PDAs), mobile Internet devices (MIDs), or wearable devices (Wearable Devices), etc. The specific type of terminal 11 is not limited in the disclosed embodiment. The terminal 11 can establish communication with the network side device 12, wherein the network in the figure can indicate that the terminal 11 wirelessly establishes communication with the network side device 12, and the network side device 12 can be an evolved base station (eNB) or other base station. It may be a network side device such as an access point device. It should be noted that the specific type of the network side device 12 is not limited in the embodiment of the present disclosure.

Referring to FIG. 2, an embodiment of the present disclosure provides a method for acquiring channel state information, as shown in FIG. 2, including the following steps:

202. The terminal receives, by the network side device, a target precoding matrix index corresponding to M target channel ranks of the N channel ranks, where the M is an integer greater than or equal to 1, and the N is greater than Or equal to M;

203. The terminal calculates, according to the M target channel ranks and the precoding matrix of the target precoding matrix index corresponding to the M target channel ranks, respectively, corresponding M channel quality indexes.

In the non-codebook MIMO mode, the terminal only feeds back the RI (Rank Indication) and CQI to the network side device, but the terminal does not feed back the PMI to the network side device. Since the terminal does not feed back the PMI, the CQI calculated by the terminal may not accurately represent the true channel quality, and the network side device may not be aware of the specific calculation process of the CQI fed back by the terminal. The above two aspects are urgently needed to solve the channel state information in the current non-codebook MIMO system.

In view of the above problems, embodiments of the present disclosure provide a method of acquiring channel state information adapted to a non-codebook MIMO system.

In the embodiment of the present disclosure, for the step 201, the network side device may send the downlink measurement pilot CSI-RS to the terminal, and after receiving the downlink measurement pilot sent by the network side device, the terminal may perform the downlink measurement pilot received. Measurement, and N RIs can be obtained based on the results of the measurements. After the terminal obtains N RIs, the terminal may report the N RIs to the network side device.

The downlink measurement pilot may be used for measurement of channel state information, where the channel state information includes, but is not limited to, at least one of information such as CQI, PMI, and RI.

The downlink measurement pilot sent by the network side device to the terminal may be one or multiple. If the network side device sends multiple downlink measurement pilots to the terminal, the terminal may measure any one or any of the multiple downlink measurement pilots. For example, the network side device sends four downlink measurement pilots to the terminal, and if each downlink measurement pilot has eight ports, the terminal can measure one 8-port downlink measurement pilot, and can also measure two 8-port downlink measurement. Pilot, and so on.

The RI can correspond to the number of data streams that can be simultaneously transmitted by the channel at the time. Because the channel is changed, the RI also changes, but the maximum RI does not exceed the number of ports of the downlink measurement pilot, and does not exceed the terminal receiving antenna. number. For example, if the downlink measurement pilot has 8 ports and the number of terminal reception antennas is 8, the RI may be 1, 2, 3, 4, 5, 6, 7, 8. If the downlink measurement pilot has 8 ports, but the number of terminal reception antennas is 4, the RI may be 1, 2, 3, 4.

In addition, a downlink measurement pilot can correspond to multiple RIs. If a plurality of RIs reported by the terminal to the network side device correspond to one measurement pilot, it can be understood that the RI can be used for the terminal under the channel condition at the time. use.

In the embodiment of the present disclosure, after receiving the N RIs reported by the terminal, the network side device may determine M target RIs among the N RIs according to the channel quality. After the target RI is determined, the network side device may acquire the target PMI corresponding to the M target channel ranks, and send the acquired target PMI to the terminal.

At this point, the network side device determines the target RI and the target PMI corresponding to the target RI, that is, the terminal can acquire the precoding matrix corresponding to the target RI, and calculate the corresponding CQI through the precoding matrix. For convenience of understanding, the following is an example of the 2-antenna codebook shown in Table 1, that is, the RI that the terminal can report is 1 or 2.

Table 1

For example, the terminal reports RI=2. After acquiring the channel information, the network side device can select a corresponding PMI from the codebook with RI=2 according to the acquired channel information (the corresponding PMI value can be 0 or 1 or 2) Assuming that the PMI value selected by the network side device is 0, the precoding matrix corresponding to PMI 0 and RI 2 is

That is, the terminal can acquire the precoding matrix corresponding to the target RI.

Thus, in the embodiment of the present disclosure, for the step 203, the terminal may, according to the target RI determined by the network side device in step 202, and the target precoding matrix index corresponding to the target RI sent by the network side device to the terminal in step 202. The coding matrix calculates the corresponding CQI.

Through the above steps, the authenticity and accuracy of the CQI value calculated by the terminal in the non-codebook MIMO system can be realized, and the CQI of the network side device can be understood to be consistent. This is because the network side device sends the PMI corresponding to the RI to the terminal according to the RI reported by the terminal, so as to ensure that the CQI value calculated by the terminal is true and accurate. In addition, the terminal calculates the CQI by using the PMI indicated by the network side device, and the terminal calculates When the CQI is fed back to the network side device, the network side device can achieve the same understanding of the CQI fed back by the terminal.

In addition, in the embodiment of the present disclosure, the terminal may be the terminal shown in FIG. 1 , and the terminal may include one or more antenna modules, for example, as shown in FIG. 3 , including multiple antenna modules.

Optionally, the method further includes: the terminal sending an uplink sounding pilot to the network side device, where the uplink sounding pilot is used for measurement by the network side device, and determining the N according to the measurement result. M target channel ranks in the channel rank, and target precoding matrix indices corresponding to the M target channel ranks.

The embodiment provides a specific method for the network side device to acquire the target RI and the target PMI corresponding to the target RI, that is, the network side device can determine the target RI and correspond to the target RI through the uplink probe pilot sent by the terminal. The target PMI. Specifically, the terminal may send an uplink sounding reference signal (SRS) to the network side device; the network side device may measure the uplink sounding pilot after receiving the uplink sounding pilot, where The measurement of the uplink sounding pilot may enable the network side device to acquire the channel quality, and further determine the target RI and the target PMI corresponding to the target RI according to the channel quality.

Based on the channel reciprocity feature, in the TDD (Time Division Duplex) system, the uplink and downlink work on the same frequency. Therefore, the network side device can obtain the downlink channel information by measuring the uplink sounding pilot, that is, The PMI obtained by the network side device through the measurement of the uplink sounding pilot can be used for downlink data precoding transmission.

In this embodiment, the target PMI is determined by the measurement of the uplink sounding pilot by the network side device, which embodies the channel reciprocity characteristic. The CQI calculated by the terminal more accurately represents the true channel quality.

As an optional implementation manner, if the N is equal to 1, the M is equal to 1, the uplink sounding pilot is used for measurement by the network side device, and the M target channel ranks are determined according to the measurement result. Corresponding target precoding matrix index.

The optional implementation may be adapted to the case where the terminal reports an RI to the network side device. Since the terminal reports only one RI to the network side device, the network side device can directly use the RI as the target RI, and determine the target PMI corresponding to the target RI according to the measurement result of the uplink sounding pilot.

As another optional implementation manner, if the N is greater than 1, the M is greater than or equal to 1, the uplink sounding pilot is used for measurement by the network side device, and the N devices are determined according to the measurement result. M target channel ranks in the channel rank, and target precoding matrix indices corresponding to the M target channel ranks.

The optional implementation may be adapted to the case where the terminal reports multiple RIs to the network side device. Since the terminal reports more than one RI to the network side device, the network side device may select an appropriate at least one RI as the target RI among the plurality of RIs. Specifically, the network side device may select the target RI according to the measurement of the uplink sounding pilot. For example, the network side device can obtain the channel quality by measuring the uplink sounding pilot. If the channel quality is high, the network side device can use the larger RI as the target RI; if the channel quality is low, the network side device can use the smaller RI. As the target RI. Certainly, the manner in which the network side device determines the target RI may be other feasible methods. For this, the embodiment is not limited.

It should be noted that the specific manner in which the network side device measures the uplink sounding pilot may be implemented based on any feasible algorithm or existing technology, and the target RI according to the measurement result and the target PMI corresponding to the target RI may also be based on any feasible. The algorithm or the prior art implementation, in order to avoid duplication, will not be described in detail.

In this embodiment, the terminal reports a plurality of RIs to the network side device, and the network side device determines the target RI according to the measurement of the uplink sounding pilot, which has the beneficial effect of improving the target RI selection flexibility.

The data transmission mode of the target RI may be different according to the data transmission mode assumed by the network side device. The data transmission mode assumed by the network side device may be the data transmission mode of the subcarrier. In order to better understand the present embodiment, the following description will be made by taking the four antenna RI as an example. The data transmission mode of the subcarriers assumed by the network side device may be that all subcarriers are precoded and transmitted by using a precoding matrix corresponding to one PMI, or precoding transmission may be performed by using a precoding matrix corresponding to multiple PMIs. The manner in which precoding transmission is performed by using one PMI corresponding precoding matrix for all subcarriers is easily understood, and no special description is made for this. For precoding transmission with precoding matrices corresponding to multiple PMIs, it can correspond to multiple hypothetical transmission modes. For example, the network side device may indicate that the RI of the four antenna codebook is 2 and perform data transmission under the assumption of two PMI cycles, and may be an odd subcarrier adopting PMI1 and an even subcarrier adopting PMI2 for PMI loop, as shown in FIG. Alternatively, the PMI cycle may be performed in units of consecutive N carriers, as shown in FIG.

In this embodiment, the first transmission mode assumed by the network side device may be a manner in which the entire subcarrier is transmitted under one PMI. In this mode, the target RI and the corresponding target PMI are in a one-to-one relationship.

The method further includes: acquiring, by the terminal, a precoding matrix cyclic manner corresponding to each target channel rank of the M target channel ranks;

In this embodiment, the second transmission mode assumed by the network side device may be a mode in which subcarriers are transmitted under multiple PMIs. In this mode, the target RI and the corresponding target PMI are one-to-many relationships.

In the above two embodiments, the method for acquiring channel state information of the embodiment of the present disclosure may be adapted to different data transmission by determining the target PMI corresponding to the target RI by considering the difference in the data transmission manner assumed by the network side device. In this way, the flexibility of the non-codebook MIMO system can be improved to suit the needs of different scenarios or services.

Optionally, the method further includes: the terminal reporting the M channel quality indexes to the network side device, where the M channel quality indexes are used by the network side device according to the M target channels The rank and the M channel quality indexes, and the precoding matrix of the target precoding matrix index corresponding to the M target channel ranks, transmit downlink data to the terminal.

In this embodiment, the terminal may also report the calculated M CQIs to the network side device. After receiving the CQI reported by the terminal, the network side device may use the RI reported by the terminal (or the target RI determined by the network side device) and the CQI. And the precoding matrix corresponding to the target PMI performs downlink data transmission.

So far, the network side device completes the entire workflow of acquiring channel state information and performing downlink data transmission.

Referring to FIG. 6, a method for acquiring channel state information is also provided in the embodiment of the present disclosure. As shown in FIG. 6, the method includes the following steps:

601. The network side device sends a downlink measurement pilot to the terminal, and accepts N channel ranks reported by the terminal, where the downlink measurement pilot is used for measurement by the terminal, where the N channel ranks are based on the terminal. a channel rank determined by the measurement of the downlink measurement pilot, where N is an integer greater than or equal to 1;

602. The network side device determines a target precoding matrix index corresponding to M target channel ranks of the N channel ranks.

603. The network side device sends, to the terminal, the target precoding matrix index corresponding to the M target channel ranks, where the target precoding matrix index corresponding to the M target channel ranks is used by the terminal. Calculating M channel quality indexes corresponding to the M target channel ranks; the M is an integer greater than or equal to 1, and the N is greater than or equal to M.

Optionally, the method further includes:

It should be noted that the present embodiment is an implementation manner of the network side device corresponding to the embodiment shown in FIG. 2, and a specific implementation manner of the embodiment may refer to the related description of the embodiment shown in FIG. This embodiment will not be described again, and the same advantageous effects can be achieved.

Referring to FIG. 7, an embodiment of the present disclosure provides a terminal. As shown in FIG. 7, the terminal 700 includes:

The sending module 701 is configured to measure a downlink measurement pilot sent by the network side device, and report N channel ranks to the network side device according to the measurement result, where the N is an integer greater than or equal to 1;

The receiving module 702 is configured to receive, by the network side device, a target precoding matrix index corresponding to M target channel ranks of the N channel ranks, where the M is an integer greater than or equal to 1, the N Greater than or equal to M;

The calculation module 703 is configured to calculate corresponding M channel quality indexes according to the M target channel ranks and the precoding matrix corresponding to the target precoding matrix index corresponding to the M target channel ranks.

Optionally, the sending module 701 is configured to send, to the network side device, an uplink sounding pilot, where the uplink sounding pilot is used for measurement by the network side device, and determine the M target channels according to the measurement result. The target precoding matrix index corresponding to the rank.

Optionally, if the data transmission mode assumed by the network side device is the first transmission mode, the calculating module 703 is configured to perform target precoding according to the M target channel ranks and the M target channel ranks. The precoding matrix of the matrix index calculates the corresponding M channel quality indexes.

Optionally, as shown in FIG. 8, if the assumed data transmission mode of the network side device is the second transmission mode, the number of target precoding matrix indexes corresponding to the M target channel ranks is Y, Said Y is equal to a positive integer multiple of M;

The terminal 700 further includes an obtaining module 704, configured to acquire a precoding matrix cyclic manner corresponding to each target channel rank of the M target channel ranks;

The calculation module 703 is configured to: according to the M target channel ranks, a precoding matrix of a target precoding matrix index corresponding to the M target channel ranks, and the precoding matrix cyclic manner corresponding to each target channel rank , respectively calculate corresponding M channel quality indexes.

Optionally, the sending module 701 is configured to report the M channel quality indexes to the network side device, where the M channel quality indexes are used by the network side device according to the M target channel rank sums. And the M channel quality indexes and the precoding matrix of the target precoding matrix index corresponding to the M target channel ranks, and transmitting downlink data to the terminal.

It should be noted that, in the embodiment, the foregoing terminal 700 may be a terminal in any embodiment of the method in the embodiment of the disclosure, and any implementation manner of the terminal in the method embodiment in the embodiment of the disclosure may be used in this embodiment. The foregoing terminal 700 is implemented, and achieves the same beneficial effects, and details are not described herein again.

Referring to FIG. 9 , an embodiment of the present disclosure provides a network side device. As shown in FIG. 9 , the network side device 900 includes:

The receiving module 901 is configured to send a downlink measurement pilot to the terminal, and accept N channel ranks reported by the terminal, where the downlink measurement pilot is used for measurement by the terminal, and the N channel ranks are the terminal The N is an integer greater than or equal to 1 based on a channel rank determined by measuring the downlink measurement pilot;

a determining module 902, configured to determine a target precoding matrix index corresponding to M target channel ranks of the N channel ranks;

a sending module 903, configured to send, to the terminal, the target precoding matrix index corresponding to the M target channel ranks, where the target precoding matrix index corresponding to the M target channel ranks is used by the terminal to calculate M channel quality indexes corresponding to the M target channel ranks; the M is an integer greater than or equal to 1, and the N is greater than or equal to M.

Optionally, the receiving module 901 is configured to receive an uplink sounding pilot sent by the terminal;

The determining module 902 is configured to measure the uplink sounding pilot, and determine a target precoding matrix index corresponding to the M target channel ranks according to the measurement result.

Optionally, if the N is equal to 1, and the M is equal to 1, the determining module 902 is configured to measure the uplink sounding pilot, and determine target precoding corresponding to the M target channel ranks according to the measurement result. Matrix index

If the N is greater than 1, the M is greater than or equal to 1, the determining module 902 is configured to measure the uplink sounding pilot, and determine M target channel ranks of the N channel ranks according to the measurement result, and a target precoding matrix index corresponding to the M target channel ranks.

Optionally, if the data transmission mode of the network side device is the first transmission mode, the determining module 902 is configured to determine a target precoding matrix index corresponding to the M target channel ranks of the N channel ranks.

The sending module 903 is configured to send, to the terminal, a precoding matrix cyclic manner corresponding to a target precoding matrix index corresponding to each target channel rank of the M target channel ranks, where each target channel rank corresponds to The precoding matrix cyclic mode is used for the terminal to calculate corresponding M channel quality indexes.

Optionally, the receiving module 901 is configured to receive the M channel quality indexes reported by the terminal;

The sending module 903 is configured to transmit downlink to the terminal according to the M target channel ranks and the M channel quality indexes, and a precoding matrix of a target precoding matrix index corresponding to the M target channel ranks. data.

It should be noted that, in the embodiment, the network side device 900 may be the network side device in any of the method embodiments in the embodiment of the disclosure, and any implementation manner of the network side device in the method embodiment in the embodiment of the disclosure It can be implemented by the network side device 900 in this embodiment, and achieve the same beneficial effects, and details are not described herein again.

Referring to FIG. 10, an embodiment of the present disclosure provides another terminal. As shown in FIG. 10, the terminal includes: a processor 1000, a transceiver 1010, a memory 1020, a user interface 1030, and a bus interface, where:

The processor 1000 is configured to read a program in the memory 1020 and perform the following process:

The downlink measurement pilots sent by the network side device are measured by the transceiver 1010, and N channel ranks are reported to the network side device according to the measurement result, where N is an integer greater than or equal to 1;

Receiving, by the transceiver 1010, a target precoding matrix index corresponding to M target channel ranks of the N channel ranks sent by the network side device, where the M is an integer greater than or equal to 1, and the N is greater than or Equal to M;

The corresponding M channel quality indexes are respectively calculated by the transceiver 1010 according to the M target channel ranks and the precoding matrix corresponding to the target precoding matrix index corresponding to the M target channel ranks.

The transceiver 1010 is configured to receive and transmit data under the control of the processor 1000.

In FIG. 10, the bus architecture can include any number of interconnected buses and bridges, specifically linked by one or more processors represented by processor 1000 and various circuits of memory represented by memory 1020. The bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits. The bus interface provides an interface. The transceiver 1010 can be a plurality of components, including a transmitter and a receiver, providing means for communicating with various other devices on a transmission medium. For different user equipments, the user interface 1030 may also be an interface capable of externally connecting the required devices, including but not limited to a keypad, a display, a speaker, a microphone, a joystick, and the like.

The processor 1000 is responsible for managing the bus architecture and general processing, and the memory 1020 can store data used by the processor 1000 in performing operations.

Optionally, the method further includes: sending an uplink sounding pilot to the network side device, where the uplink sounding pilot is used for measurement by the network side device, and determining the M target channel ranks according to the measurement result. Corresponding target precoding matrix index.

Optionally, if the data transmission mode assumed by the network side device is the first transmission mode, according to the M target channel ranks, and a precoding matrix of the target precoding matrix index corresponding to the M target channel ranks, Calculate the corresponding M channel quality indexes.

The method further includes: acquiring a precoding matrix cyclic manner corresponding to each of the M target channel ranks;

And calculating, according to the M target channel ranks, and the precoding matrix of the target precoding matrix index corresponding to the M target channel ranks, the corresponding M channel quality indexes, including:

Determining, according to the M target channel ranks, a precoding matrix of the target precoding matrix index corresponding to the M target channel ranks, and the precoding matrix cyclic manner corresponding to each target channel rank, respectively calculating corresponding M Channel quality index.

Optionally, the method further includes: reporting, by the network side device, the M channel quality indexes, where the M channel quality indexes are used by the network side device according to the M target channel rank sums Determining a matrix of M channel quality indices and a precoding matrix of a target precoding matrix index corresponding to the M target channel ranks, and transmitting downlink data to the terminal.

It should be noted that, in the embodiment, the foregoing terminal may be the terminal in the embodiment shown in FIG. 1 to FIG. 9 , and any implementation manner of the terminal in the embodiment shown in FIG. 1 to FIG. 9 may be used in the embodiment. The above terminals are implemented, and the same beneficial effects are achieved, and details are not described herein again.

Referring to FIG. 11, an embodiment of the present disclosure provides another network side device. As shown in FIG. 11, the network device includes: a processor 1100, a transceiver 1110, a memory 1120, a user interface 1130, and a bus interface, where:

The processor 1100 is configured to read a program in the memory 1120 and perform the following process:

Transmitting, by the transceiver 1110, a downlink measurement pilot to the terminal, and accepting N channel ranks reported by the terminal, where the downlink measurement pilot is used for measurement by the terminal, and the N channel ranks are a channel rank determined by the measurement of the downlink measurement pilot, where N is an integer greater than or equal to 1;

Determining, by the transceiver 1110, a target precoding matrix index corresponding to M target channel ranks of the N channel ranks;

Transmitting, by the transceiver 1110, the target precoding matrix index corresponding to the M target channel ranks to the terminal, where the target precoding matrix index corresponding to the M target channel ranks is used by the terminal to calculate and The M channel quality indexes corresponding to the M target channel ranks; the M is an integer greater than or equal to 1, and the N is greater than or equal to M.

The transceiver 1110 is configured to receive and transmit data under the control of the processor 1100.

In FIG. 11, the bus architecture may include any number of interconnected buses and bridges, specifically linked by one or more processors represented by processor 1100 and various circuits of memory represented by memory 1120. The bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits. The bus interface provides an interface. The transceiver 1110 can be a plurality of components, including a transmitter and a receiver, providing means for communicating with various other devices on a transmission medium. For different user equipments, the user interface 1130 may also be an interface capable of externally connecting the required devices, including but not limited to a keypad, a display, a speaker, a microphone, a joystick, and the like.

The processor 1100 is responsible for managing the bus architecture and general processing, and the memory 1120 can store data used by the processor 1100 in performing operations.

Optionally, the method further includes: receiving an uplink sounding pilot sent by the terminal;

Determining a target precoding matrix index corresponding to M target channel ranks of the N channel ranks, including:

The uplink sounding pilot is measured, and a target precoding matrix index corresponding to the M target channel ranks is determined according to the measurement result.

Optionally, if the N is equal to 1, the M is equal to 1, measuring the uplink sounding pilot, and determining a target precoding matrix index corresponding to the M target channel ranks according to the measurement result;

If the N is greater than 1, and the M is greater than or equal to 1, determining a target precoding matrix index corresponding to the M target channel ranks of the N channel ranks, including:

The uplink sounding pilot is measured, and M target channel ranks of the N channel ranks and a target precoding matrix index corresponding to the M target channel ranks are determined according to the measurement result.

Optionally, if the data transmission mode of the network side device is the first transmission mode, determining a target precoding matrix index corresponding to the M target channel ranks of the N channel ranks.

Transmitting, to the terminal, a precoding matrix cyclic manner corresponding to a target precoding matrix index corresponding to each target channel rank of the M target channel ranks, where the precoding matrix cyclic manner corresponding to each target channel rank is used And calculating, by the terminal, the corresponding M channel quality indexes.

Optionally, the method further includes:

Receiving, by the M channel quality indexes reported by the terminal;

And downlink data is transmitted to the terminal according to the M target channel ranks and the M channel quality indexes, and a precoding matrix of a target precoding matrix index corresponding to the M target channel ranks.

It should be noted that, in this embodiment, the network side device may be the network side device in the embodiment shown in FIG. 1 to FIG. 9 , and any implementation manner of the network side device in the embodiment shown in FIG. 1 to FIG. 9 may be used. It is implemented by the above network side device in this embodiment, and achieves the same beneficial effects, and details are not described herein again.

A person skilled in the art can understand that all or part of the steps of the method for obtaining the channel state information of the terminal side provided by the foregoing embodiment can be completed by using hardware related to the program instruction, and the program can be stored in a storage medium. When the program is executed, it includes the following steps:

Optionally, the method further includes:

The method further includes:

Optionally, the method further includes:

A person skilled in the art can understand that all or part of the steps of the method for acquiring channel state information of the network side device provided by the foregoing embodiment can be completed by using hardware related to the program instruction, and the program can be stored in a storage medium. When the program is executed, it includes the following steps:

Optionally, the method further includes:

In the several embodiments provided in the present application, it should be understood that the disclosed method and apparatus may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.

In addition, each functional unit in various embodiments of the present disclosure may be integrated into one processing unit, or each unit may be physically included separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of hardware plus software functional units.

The above-described integrated unit implemented in the form of a software functional unit can be stored in a computer readable storage medium. The above software functional unit is stored in a storage medium and includes a plurality of instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform part of the steps of the transceiving method of the various embodiments of the present disclosure. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program codes. .

The above is a preferred embodiment of the present disclosure, and it should be noted that those skilled in the art can also make several improvements and refinements without departing from the principles of the present disclosure. It should be considered as the scope of protection of this disclosure.

Claims

A method for obtaining channel state information includes:

The terminal measures the downlink measurement pilots sent by the network side device, and reports N channel ranks to the network side device according to the measurement result, where the N is an integer greater than or equal to 1;

Receiving, by the network side device, a target precoding matrix index corresponding to M target channel ranks of the N channel ranks, where the M is an integer greater than or equal to 1, and the N is greater than or equal to M;

The terminal respectively calculates corresponding M channel quality indexes according to the M target channel ranks and the precoding matrix corresponding to the target precoding matrix index corresponding to the M target channel ranks.
The method of claim 1 further comprising:

The terminal sends an uplink sounding pilot to the network side device, where the uplink sounding pilot is used for measurement by the network side device, and determines a target precoding matrix index corresponding to the M target channel ranks according to the measurement result. .
The method according to claim 2, wherein if the N is equal to 1, the M is equal to 1, the uplink sounding pilot is used for measurement by the network side device, and the M targets are determined according to the measurement result. a target precoding matrix index corresponding to the channel rank;

If the N is greater than 1, the M is greater than or equal to 1, the uplink sounding pilot is used for measurement by the network side device, and the M target channel ranks of the N channel ranks are determined according to the measurement result, And a target precoding matrix index corresponding to the M target channel ranks.
The method according to any one of claims 1 to 3, wherein if the data transmission mode assumed by the network side device is the first transmission mode, the terminal according to the M target channel ranks, and the M The precoding matrix of the target precoding matrix index corresponding to the target channel ranks, and the corresponding M channel quality indexes are calculated.
The method according to any one of claims 1 to 3, wherein if the data transmission mode assumed by the network side device is the second transmission mode, the target precoding matrix indexes corresponding to the M target channel ranks The number is Y, and the Y is equal to a positive integer multiple of M;

The method further includes:

Obtaining, by the terminal, a precoding matrix cycle manner corresponding to each target channel rank of the M target channel ranks;

The terminal calculates a corresponding M channel quality index according to the M target channel ranks and the precoding matrix of the target precoding matrix index corresponding to the M target channel ranks, including:

And the terminal calculates, according to the M target channel ranks, a precoding matrix of the target precoding matrix index corresponding to the M target channel ranks, and the precoding matrix cyclic manner corresponding to each target channel rank, respectively M channel quality indices.
The method according to any one of claims 1 to 3, wherein the method further comprises: the terminal reporting the M channel quality indexes to the network side device, the M channel quality indexes being used for And transmitting, by the network side device, downlink data to the terminal according to the M target channel ranks and the M channel quality indexes, and a precoding matrix of a target precoding matrix index corresponding to the M target channel ranks. .
A method for obtaining channel state information includes:

The network side device sends a downlink measurement pilot to the terminal, and accepts N channel ranks reported by the terminal, where the downlink measurement pilot is used for measurement by the terminal, and the N channel ranks are based on the terminal Determining a channel rank determined by measurement of a downlink measurement pilot, where N is an integer greater than or equal to 1;

Determining, by the network side device, a target precoding matrix index corresponding to M target channel ranks of the N channel ranks;

The network side device sends the target precoding matrix index corresponding to the M target channel ranks to the terminal, where the target precoding matrix index corresponding to the M target channel ranks is used for calculation by the terminal M channel quality indexes corresponding to the M target channel ranks; the M is an integer greater than or equal to 1, and the N is greater than or equal to M.
The method of claim 7 further comprising:

Receiving, by the network side device, an uplink sounding pilot sent by the terminal;

Determining, by the network side device, a target precoding matrix index corresponding to M target channel ranks of the N channel ranks, including:

The network side device measures the uplink sounding pilot, and determines a target precoding matrix index corresponding to the M target channel ranks according to the measurement result.
The method according to claim 8, wherein if the N is equal to 1, and the M is equal to 1, the network side device measures the uplink sounding pilot, and determines the rank of the M target channels according to the measurement result. Corresponding target precoding matrix index;

If the N is greater than 1, and the M is greater than or equal to 1, the network side device determines a target precoding matrix index corresponding to the M target channel ranks of the N channel ranks, including:

The network side device measures the uplink sounding pilot, and determines M target channel ranks of the N channel ranks according to the measurement result, and a target precoding matrix index corresponding to the M target channel ranks.
The method according to any one of claims 7 to 9, wherein if the data transmission mode of the network side device is the first transmission mode, the network side device determines M of the N channel ranks The target precoding matrix index corresponding to the target channel rank.
The method according to any one of claims 7 to 9, wherein if the data transmission mode of the network side device is the second transmission mode, the number of target precoding matrix indexes corresponding to the M target channel ranks Y, the Y is equal to a positive integer multiple of M;

Determining, by the network side device, a target precoding matrix index corresponding to M target channel ranks of the N channel ranks, including:

Transmitting, by the network side device, a precoding matrix cyclic manner corresponding to a target precoding matrix index corresponding to each target channel rank of the M target channel ranks, and the preamble corresponding to each target channel rank The coding matrix cyclic mode is used for the terminal to calculate corresponding M channel quality indexes.
A method according to any one of claims 7 to 9, further comprising:

Receiving, by the network side device, the M channel quality indexes reported by the terminal;

The network side device transmits downlink data to the terminal according to the M target channel ranks and the M channel quality indexes, and a precoding matrix of a target precoding matrix index corresponding to the M target channel ranks.
A terminal comprising:

a sending module, configured to measure a downlink measurement pilot sent by the network side device, and report N channel ranks to the network side device according to the measurement result, where the N is an integer greater than or equal to 1;

a receiving module, configured to receive, by the network side device, a target precoding matrix index corresponding to M target channel ranks of the N channel ranks, where the M is an integer greater than or equal to 1, and the N is greater than Or equal to M;

The calculation module is configured to calculate corresponding M channel quality indexes according to the M target channel ranks and the precoding matrix corresponding to the target precoding matrix index corresponding to the M target channel ranks.
The terminal according to claim 13, wherein the sending module is configured to send an uplink sounding pilot to the network side device, where the uplink sounding pilot is used for measurement by the network side device, and is determined according to the measurement result. a target precoding matrix index corresponding to the M target channel ranks.
The terminal according to claim 14, wherein if the N is equal to 1, the M is equal to 1, the uplink sounding pilot is used for measurement by the network side device, and the M targets are determined according to the measurement result. a target precoding matrix index corresponding to the channel rank;

If the N is greater than 1, the M is greater than or equal to 1, the uplink sounding pilot is used for measurement by the network side device, and the M target channel ranks of the N channel ranks are determined according to the measurement result, And a target precoding matrix index corresponding to the M target channel ranks.
The terminal according to any one of claims 13 to 15, wherein if the data transmission mode assumed by the network side device is the first transmission mode, the calculation module is configured to use the M target channel ranks, and And a precoding matrix of the target precoding matrix index corresponding to the M target channel ranks, and calculating corresponding M channel quality indexes.
The terminal according to any one of claims 13 to 15, wherein if the assumed data transmission mode of the network side device is the second transmission mode, the target precoding matrix index corresponding to the M target channel ranks The number is Y, and the Y is equal to a positive integer multiple of M;

The terminal further includes an obtaining module, configured to acquire a precoding matrix cyclic manner corresponding to each target channel rank of the M target channel ranks;

The calculation module is configured to: according to the M target channel ranks, a precoding matrix of a target precoding matrix index corresponding to the M target channel ranks, and a precoding matrix cyclic manner corresponding to each target channel rank, The corresponding M channel quality indexes are respectively calculated.
The terminal according to any one of claims 13 to 15, wherein the transmitting module is configured to report the M channel quality indexes to the network side device, where the M channel quality indexes are used for the The network side device transmits downlink data to the terminal according to the M target channel ranks and the M channel quality indexes, and a precoding matrix of a target precoding matrix index corresponding to the M target channel ranks.
A network side device, including:

a receiving module, configured to send a downlink measurement pilot to the terminal, and accept N channel ranks reported by the terminal, where the downlink measurement pilot is used for measurement by the terminal, where the N channel ranks are based on the terminal a channel rank determined by the measurement of the downlink measurement pilot, where N is an integer greater than or equal to 1;

a determining module, configured to determine a target precoding matrix index corresponding to M target channel ranks of the N channel ranks;

a sending module, configured to send, to the terminal, the target precoding matrix index corresponding to the M target channel ranks, where a target precoding matrix index corresponding to the M target channel ranks is used for calculation by the terminal M channel quality indexes corresponding to the M target channel ranks; the M is an integer greater than or equal to 1, and the N is greater than or equal to M.
The network side device according to claim 19, wherein the receiving module is configured to receive an uplink sounding pilot sent by the terminal;

The determining module is configured to measure the uplink sounding pilot, and determine a target precoding matrix index corresponding to the M target channel ranks according to the measurement result.
The network side device according to claim 20, wherein, if the N is equal to 1, and the M is equal to 1, the determining module is configured to measure the uplink sounding pilot, and determine and the M according to the measurement result. a target precoding matrix index corresponding to the target channel rank;

If the N is greater than 1, the M is greater than or equal to 1, the determining module is configured to measure the uplink sounding pilot, and determine, according to the measurement result, M target channel ranks of the N channel ranks, and a target precoding matrix index corresponding to the M target channel ranks.
The network side device according to any one of claims 19 to 21, wherein, if the data transmission mode of the network side device is the first transmission mode, the determining module is configured to determine the rank with the N channels The target precoding matrix index corresponding to the M target channel ranks.
The network side device according to any one of claims 19 to 21, wherein if the data transmission mode of the network side device is the second transmission mode, the target precoding matrix index corresponding to the M target channel ranks The number is Y, and the Y is equal to a positive integer multiple of M;

The sending module is configured to send, to the terminal, a precoding matrix cyclic manner corresponding to a target precoding matrix index corresponding to each target channel rank of the M target channel ranks, where each target channel rank corresponds to the The precoding matrix cyclic mode is used for the terminal to calculate corresponding M channel quality indexes.
The network side device according to claim 19 or 21, wherein the receiving module is configured to receive the M channel quality indexes reported by the terminal;

The sending module is configured to transmit downlink data to the terminal according to the M target channel ranks and the M channel quality indexes, and a precoding matrix of a target precoding matrix index corresponding to the M target channel ranks. .
A terminal includes: a processor, a transceiver, a memory, a user interface, and a bus interface, wherein:

The processor is configured to read a program in the memory, and perform the steps in the method for acquiring channel state information according to any one of claims 1 to 6.
A network side device includes: a processor, a transceiver, a memory, a user interface, and a bus interface, wherein:

The processor is configured to read a program in the memory, and perform the steps in the method for acquiring channel state information according to any one of claims 7 to 12.
A computer readable storage medium having stored thereon a computer program, wherein the computer program is executed by a processor to perform the steps of the method of acquiring channel state information according to any one of claims 1 to 6.
A computer readable storage medium having stored thereon a computer program, wherein the computer program is executed by a processor to perform the steps of the method of acquiring channel state information according to any one of claims 7 to 12.