CN111726181B

CN111726181B - Method and device for acquiring channel state information

Info

Publication number: CN111726181B
Application number: CN201910204302.3A
Authority: CN
Inventors: 蒲磊
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2019-03-18
Filing date: 2019-03-18
Publication date: 2022-10-21
Anticipated expiration: 2039-03-18
Also published as: CN111726181A; WO2020186916A1

Abstract

The embodiment of the invention discloses a method and a device for acquiring channel state information, which comprises the following steps: when the transmitting power of a reference signal needs to be adjusted is determined according to the proportion of the number of users with excellent channel quality in a cell to the total number of users in the cell and the proportion of the number of users with extremely bad channel quality in the cell to the total number of users in the cell, the transmitting power of the reference signal is adjusted, and the reference signal is transmitted by the adjusted transmitting power; receiving a Channel Quality Indicator (CQI) measured by a reference signal after adjusting the transmitting power, and determining the signal-to-noise ratio (SINR) of a downlink channel according to the CQI and the transmitting power adjustment amount of the reference signal. The embodiment of the invention reduces the error caused by the limitation of the measuring capability or the limitation of the feedback information of the user equipment when the user is in the excellent or extremely bad channel quality, and improves the accuracy of the SINR.

Description

Method and device for acquiring channel state information

Technical Field

Embodiments of the present invention relate to, but not limited to, the field of communications, and in particular, to a method and an apparatus for acquiring channel state information.

Background

In a wireless communication system, before a base station transmits data to User Equipment (UE), downlink Channel Quality Information (MCS) needs to be acquired, and a Modulation and Coding Scheme (MCS) suitable for a current Channel state is selected according to the Downlink Channel Quality Information. The Channel State Information-Reference Signal (CSI-RS) is a Signal transmitted by a base station using a sequence agreed with the UE, and the UE estimates the quality State of a downlink Channel by demodulating, measuring, and calculating the reception strength of the CSI-RS after receiving the CSI-RS. After the UE completes the calculation, the measured Channel state is fed back to the base station in an uplink Channel in the form of a Channel Quality Indicator (CQI). The accurate downlink channel quality state is of great importance, and the following purposes can be achieved through the method: 1) Selecting a reasonable downlink scheduling strategy according to the channel state of the UE; 2) The downlink throughput rate of the user is improved; 3) Effectively control Block Error rate (BLER), and so on.

In a related communication system, when a UE measures a CSI-RS, the UE measures the received power, interference power, and Noise of the received CSI-RS, calculates a Signal to Interference plus Noise Ratio (SINR) of the received CSI-RS according to the received power, interference power, and Noise, estimates the quality of a Downlink Channel according to the SINR, and further calculates a reasonable Modulation and Coding Scheme (MCS) used by a Physical Downlink Shared Channel (PDSCH) for transmitting Downlink traffic data.

Under such a premise, there are the following problems:

1. in some cases, limited by the measurement performance bottleneck of the UE, when the UE is under excellent or bad channel quality (for example, when the UE is very close or very far from the base station), the reception power of the CSI-RS will be respectively too high and too low, limited by the dynamic range of its power measurement, and the UE will not be able to measure the true reception power of the CSI-RS, or the limitation of feedback information in the communication system (for example, the limitation of the range of the CQI reporting field), and the CQI reported by the UE to the base station will be far from the true downlink channel quality status.

2. When the UE needs to perform feedback of a Precoding Matrix (PMI), feeding back a PMI with the highest CQI, and if there are multiple PMIs with the highest CQI, randomly selecting one PMI to perform feedback; when the UE is very close to the base station, all PMIs have the highest CQI value, and then the UE will randomly feed back one PMI among all PMIs, that is, the PMIs reported by the UE multiple times at a close point will exhibit irregular random hopping, which may cause a problem of scrambling in the forming direction during the space division multiplexing among multiple close point UEs.

Disclosure of Invention

The embodiment of the invention provides a method and a device for acquiring channel state information, which can improve the accuracy of the channel state information when a user is in excellent or extremely bad channel quality.

The embodiment of the invention provides a method for acquiring channel state information, which comprises the following steps:

when determining that the transmission power of a reference signal needs to be adjusted according to the proportion of the number of users with excellent channel quality in a cell to the total number of users in the cell and the proportion of the number of users with extremely bad channel quality in the cell to the total number of users in the cell, adjusting the transmission power of the reference signal, and sending the reference signal with the adjusted transmission power;

receiving a Channel Quality Indicator (CQI) measured by a reference signal after adjusting the transmitting power, and determining the signal-to-noise ratio (SINR) of a downlink channel according to the CQI and the transmitting power adjustment amount of the reference signal.

The embodiment of the invention provides a device for acquiring channel state information, which comprises:

the adjusting module is used for adjusting the transmitting power of the reference signal when the transmitting power of the reference signal is determined to be adjusted according to the proportion of the number of users with excellent channel quality in a cell to the total number of users in the cell and the proportion of the number of users with extremely bad channel quality in the cell to the total number of users in the cell, and the reference signal is sent at the adjusted transmitting power;

and the acquisition module is used for receiving the channel quality indicator CQI measured by the reference signal after the transmission power is adjusted and determining the signal-to-noise ratio SINR of the downlink channel according to the CQI and the transmission power adjustment quantity of the reference signal.

The embodiment of the present invention provides an apparatus for acquiring channel state information, which includes a processor and a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, and when the instructions are executed by the processor, any one of the above methods for acquiring channel state information is implemented.

An embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement the steps of any one of the above methods for acquiring channel state information.

The embodiment of the invention comprises the following steps: when determining that the transmission power of a reference signal needs to be adjusted according to the proportion of the number of users with excellent channel quality in a cell to the total number of users in the cell and the proportion of the number of users with extremely bad channel quality in the cell to the total number of users in the cell, adjusting the transmission power of the reference signal, and sending the reference signal with the adjusted transmission power; and receiving the CQI measured by the reference signal after the transmission power is adjusted, and determining the SINR of the downlink channel according to the CQI and the transmission power adjustment quantity of the reference signal. The embodiment of the invention adjusts the transmitting power of the reference signal when determining that the transmitting power of the reference signal needs to be adjusted based on the proportion of the number of users with excellent channel quality in a cell to the total number of users in the cell and the proportion of the number of users with extremely bad channel quality in the cell to the total number of users in the cell, and determines the signal-to-noise ratio (SINR) of a downlink channel based on the CQI measured by the reference signal after adjusting the transmitting power and the transmitting power adjustment quantity of the reference signal, thereby reducing the error caused by the limitation of the measuring capability of user equipment or the limitation of feedback information when the users are in excellent or extremely bad channel quality and improving the accuracy of the SINR.

In an optional embodiment, the determining, according to the ratio of the number of users with excellent channel quality in the cell to the total number of users in the cell, and the ratio of the number of users with extremely bad channel quality in the cell to the total number of users in the cell, that the transmission power of the reference signal needs to be adjusted includes at least one of: when the proportion of the number of the users with excellent channel quality in the cell to the total number of the users in the cell is greater than or equal to a first preset proportion, determining that the transmission power of the reference signal needs to be reduced; and when the proportion of the number of the users with excellent channel quality in the cell to the total number of the users in the cell is smaller than a first preset proportion, and the proportion of the number of the users with extremely bad channel quality in the cell to the total number of the users in the cell is larger than or equal to a second preset proportion, determining that the transmitting power of the reference signal needs to be increased. The embodiment of the invention reduces the transmitting power of the reference signal when the number of users with excellent channel quality in a cell is large; and when the number of users with excellent channel quality in a cell is small and the number of users with extremely bad channel quality is large, the transmitting power of the reference signal is increased, so that the dynamic range of the receiving power of the reference signal is reduced, the condition that the receiving power of the reference signal is out of the dynamic range of power measurement of the users and the condition that the reported CQI is out of the limit of the reporting field range of the CQI are reduced, the accuracy of the fed-back CQI is improved, namely the accuracy of the SINR is improved, and the condition that the PMI reported for many times at an extremely close point presents irregular random hopping is further reduced.

Additional features and advantages of embodiments of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of embodiments of the invention. The objectives and other advantages of the embodiments of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

The accompanying drawings are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the examples of the invention serve to explain the principles of the embodiments of the invention and not to limit the embodiments of the invention.

Fig. 1 is a flowchart of a method for acquiring channel state information according to an embodiment of the present invention;

FIG. 2 is a schematic view of a sliding window according to an embodiment of the present invention;

fig. 3 is a flowchart illustrating a method for acquiring channel state information according to an embodiment of the present invention;

fig. 4 is a flowchart of a method for acquiring channel state information according to a second embodiment of the present invention;

fig. 5 is a flowchart illustrating a method for acquiring channel state information according to a third embodiment of the present invention;

fig. 6 is a flowchart illustrating a method for acquiring channel state information according to a fourth embodiment of the present invention;

fig. 7 is a schematic structural diagram of an apparatus for acquiring channel state information according to another embodiment of the present invention.

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments of the present invention may be arbitrarily combined with each other without conflict.

The steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.

Referring to fig. 1, an embodiment of the present invention provides a method for acquiring channel state information, including:

step 100, when determining that the transmission power of the reference signal needs to be adjusted according to the proportion of the number of users with excellent channel quality in a cell to the total number of users in the cell and the proportion of the number of users with extremely bad channel quality in the cell to the total number of users in the cell, adjusting the transmission power of the reference signal, and sending the reference signal with the adjusted transmission power.

In the embodiment of the present invention, the reference signal may be any reference signal, for example, the reference signal includes: and (3) CSI-RS.

In the embodiment of the present invention, being in excellent channel quality means that the received power of the reference signal is too high, for example, being in excellent signal means that the received power of the reference signal is greater than or equal to a first preset power; being in a bad channel quality means that the received power of the reference signal is too low, for example, being in a bad signal means that the received power of the reference signal is less than or equal to a second predetermined power.

In the embodiment of the present invention, determining the transmission power of the reference signal to be adjusted according to the ratio of the number of users with excellent channel quality in the cell to the total number of users in the cell and the ratio of the number of users with extremely bad channel quality in the cell to the total number of users in the cell includes at least one of:

when the proportion of the number of the users with excellent channel quality in the cell to the total number of the users in the cell is greater than or equal to a first preset proportion, determining that the transmission power of the reference signal needs to be reduced;

and when the proportion of the number of the users with excellent channel quality in the cell to the total number of the users in the cell is smaller than a first preset proportion, and the proportion of the number of the users with extremely bad channel quality in the cell to the total number of the users in the cell is larger than or equal to a second preset proportion, determining that the transmitting power of the reference signal needs to be increased (namely improved).

Wherein, the condition that the ratio of the number of the users with excellent channel quality in the cell to the total number of users in the cell is greater than or equal to a first preset ratio includes at least one of the following situations:

the proportion of the number of the users with excellent channel quality in the cell to the total number of the users in the cell is greater than or equal to a first preset proportion, and the proportion of the number of the users with extremely bad channel quality in the cell to the total number of the users in the cell is greater than or equal to a second preset proportion;

the proportion of the number of the users with excellent channel quality in the cell to the total number of the users in the cell is larger than or equal to a first preset proportion, and the proportion of the number of the users with extremely bad channel quality in the cell to the total number of the users in the cell is smaller than a second preset proportion.

The embodiment of the invention reduces the transmitting power of the reference signal when the number of users with excellent channel quality in a cell is large; and when the number of users with excellent channel quality in a cell is small, and the number of users with extremely bad channel quality is large, the transmitting power of the reference signal is raised, so that the dynamic range of the receiving power of the reference signal is reduced, the condition that the receiving power of the reference signal is out of the dynamic range of the power measurement of the users and the condition that the reported CQI is out of the limit of the range of a CQI reporting field are reduced, the accuracy of the fed-back CQI is improved, namely the accuracy of the SINR is improved, and the condition that the PMI reported for many times at an extremely close point presents irregular random hopping is further reduced.

In this embodiment of the present invention, adjusting the transmission power of the reference signal, and sending the reference signal with the adjusted transmission power includes at least one of:

when the transmission power of the reference signal is determined to need to be reduced, reducing the transmission power of the reference signal, and sending the reference signal with the reduced transmission power; specifically, when the default value of the transmission power of the reference signal is P ₀ The power down offset is α (α)<0) Then, the reduced transmission power is P ₀ +α。

When the transmission power of the reference signal is determined to need to be increased, increasing the transmission power of the reference signal, and sending the reference signal with the increased transmission power; specifically, when the default value of the transmission power of the reference signal is P ₀ Offset of power ramp-up is beta (beta)>0) At the raised transmitting power of P ₀ +β。

Step 101, receiving a CQI measured by a reference signal after adjusting transmission power, and determining an SINR of a downlink channel according to the CQI and a transmission power adjustment amount of the reference signal.

In the embodiment of the invention, according to the formula

And determining the SINR of the downlink channel. Wherein, the SINR _real As the SINR of the downlink channel,

is CQI _adjust The corresponding SINR; CQI _adjust The CQI measured by the reference signal after the transmission power is adjusted;

in another embodiment of the present invention, before determining that the transmission power of the reference signal needs to be adjusted according to the ratio of the number of users with excellent channel quality in the cell to the total number of users in the cell and the ratio of the number of users with extremely bad channel quality in the cell to the total number of users in the cell, the method further includes:

determining the channel state of the user according to the information of the user characterizing the wireless channel quality; wherein the channel state comprises at least one of: whether the channel quality of the user is excellent or not and whether the channel quality of the user is extremely bad or not;

and calculating the proportion of the number of users with excellent channel quality in the cell to the total number of users in the cell and the proportion of the number of users with extremely bad channel quality in the cell to the total number of users in the cell according to the channel state of the users in the cell.

In embodiments of the present invention, the information characterizing the quality of the wireless channel may be various. For example, the information characterizing the quality of the wireless channel includes at least one of:

CQI, reference Signal Received Power (RSRP), SINR of Sounding Reference Signal (SRS), SINR of DeModulation Reference Signal (DMRS) in uplink, and the like.

The information characterizing the quality of the wireless channel is not limited in the embodiments of the present invention, and may be from a terminal device or a network device.

In the embodiment of the present invention, determining the channel state of the user according to the information characterizing the quality of the wireless channel of the user includes at least one of the following:

when all the information characterizing the wireless channel quality in the sliding window of the user is greater than or equal to a first preset threshold, determining that the user is in excellent channel quality;

and when all the information representing the wireless channel quality in the sliding window of the user is less than or equal to a second preset threshold, determining that the user is in extremely bad channel quality.

In an embodiment of the invention, a sliding window is used to maintain information characterizing the quality of a wireless channel for a user. An example of an implementation of the sliding window can be found in fig. 2. It should be noted that a sliding window may be maintained for each user.

For example, when the information characterizing the quality of the wireless channel is CQI, a sliding window may be exemplarily used to maintain the acquired CQI for several times;

for another example, when the information characterizing the quality of the wireless channel is RSRP, a sliding window may be used to maintain the RSRP acquired several times;

for another example, when the information characterizing the quality of the wireless channel is the SINR of the SRS, a sliding window may be exemplarily used to maintain the SINR of the SRS acquired several times.

In another embodiment of the present invention, considering that for those user equipments which do not need to use power-adjusted CSI-RS to measure CQI, the CSI-RS power variation may introduce errors into the CQI measurement and feedback, so as to ensure system performance, the frequency of transmitting power-adjusted CSI-RS should be maintained within a reasonable range, and before determining the channel state of the user according to the information characterizing the wireless channel quality of the user, the method further comprises at least one of the following:

when the length of the sliding window needs to be adjusted according to all the information representing the quality of the wireless channel in the sliding window, adjusting the length of the sliding window;

and when determining that the length of the sliding window does not need to be adjusted according to all the information representing the wireless channel quality in the sliding window, maintaining the length of the sliding window unchanged.

In the embodiment of the invention, whether the length of the sliding window needs to be adjusted or not can be judged when new information for representing the quality of the wireless channel is stored in the sliding window; or periodically judging whether the length of the sliding window needs to be adjusted; or other trigger conditions may be adopted, which is not limited in the embodiments of the present invention.

Wherein, the determining that the length of the sliding window needs to be adjusted according to all the information characterizing the quality of the wireless channel in the sliding window includes at least one of:

determining that the sliding window needs to be increased when all of the information characterizing the radio channel quality in the sliding window indicates that the user is at an excellent channel quality, or all of the information characterizing the radio channel quality in the sliding window indicates that the user is at an excellent channel qualityThe length of (d); specifically, the length of the sliding window is expanded according to the following formula:

wherein, winLen ₁ To increase the length of the sliding window before, winLen ₂ For the increased length of the sliding window, p is the window length growth factor;

when the ratio of the number of the information representing the wireless channel quality indicating that the user is in the extremely good channel quality to the length of the sliding window is smaller than a third preset threshold, or the ratio of the number of the information representing the wireless channel quality indicating that the user is in the extremely bad channel quality to the length of the sliding window is smaller than a fourth preset threshold, determining that the length of the sliding window needs to be shortened; specifically, the length of the sliding window is shortened according to the following formula:

wherein, winLen ₃ To shorten the length of the sliding window before, winLen ₄ For the shortened length of the sliding window, q is the window length shortening factor, and winLen _ init is the initial length of the sliding window.

As described above, for a single UE, the method of determining whether it is in extreme channel conditions is: and judging whether all the information representing the wireless channel quality in the sliding window of the UE is extreme values. Since the elements in the sliding window are periodically updated, the shorter the window length is, the easier it is to determine that the UE is in the extreme channel condition (assuming that the window length is 1, the UE is determined to be in the extreme channel condition as long as there is an extreme information value representing the radio channel quality in the window), otherwise, the longer the window length is, the harder it is to determine that the UE is in the extreme channel condition (assuming that the window length is 100, it is required that 100 pieces of information representing the radio channel quality in the window are all extreme values, and the UE is determined to be in the extreme channel condition).

For the user whose information characterizing the quality of the wireless channel in the sliding window is extreme, the sliding window of the UE is increased, and then new extreme values are needed in the window to make the UE decide "under extreme conditions" next time. As a result, the frequency of triggering a decision that the UE is in extreme channel conditions is reduced. In such a case, the number of UEs determined to be "in an extreme channel condition" per unit time becomes relatively small as viewed from the entire cell, and the frequency triggering "adjustment of CSI-RS power" is reduced.

Conversely, shortening the window length may make it easier for the UE to be determined as "in extreme channel conditions," and ultimately, may increase the frequency that triggers "adjusting CSI-RS power.

The sliding window length adaptive adjustment algorithm can reasonably adjust the window length of each UE, and finally the frequency for triggering the adjustment of the CSI-RS power is not too high or too low.

Wherein determining that the length of the sliding window does not need to be adjusted according to all the information characterizing the quality of the wireless channel in the sliding window comprises:

and when the ratio of the number of the information representing the wireless channel quality indicating that the user is in the extremely good channel quality to the length of the sliding window is greater than or equal to a third preset threshold, or the ratio of the number of the information representing the wireless channel quality indicating that the user is in the extremely bad channel quality to the length of the sliding window is greater than or equal to a fourth preset threshold, determining that the length of the sliding window does not need to be adjusted.

In another embodiment of the present invention, determining whether the user is in front of having an excellent channel quality or whether the user is in front of having an excellent channel quality according to the information characterizing the quality of the wireless channel of the user, the method further comprises: initial parameters are set.

Wherein the initial parameters include: the method comprises the steps of determining the length of a sliding window, determining that the channel quality is excellent, determining that the channel quality represents the threshold of the information of the wireless channel quality (namely a first preset threshold), determining that the channel quality is extremely bad, determining that the threshold of the information of the wireless channel quality represents the threshold of the information of the wireless channel quality (namely a second preset threshold), determining that the number of users under the excellent channel quality in a cell accounts for the total number of users in the cell (namely a first preset proportion), determining that the number of users under the extremely bad channel quality in the cell accounts for the total number of users in the cell (namely a second preset proportion), determining the transmission power default value of a reference signal, reducing the power offset and increasing the power offset.

The embodiment of the invention adjusts the transmitting power of the reference signal when determining that the transmitting power of the reference signal needs to be adjusted based on the proportion of the number of users with excellent channel quality in a cell to the total number of users in the cell and the proportion of the number of users with extremely bad channel quality in the cell to the total number of users in the cell, and determines the signal-to-noise ratio (SINR) of a downlink channel based on the CQI measured by the reference signal after adjusting the transmitting power and the transmitting power adjustment quantity of the reference signal, thereby reducing the error caused by the limitation of the measuring capability of user equipment or the limitation of feedback information when the users are in excellent or extremely bad channel quality and improving the accuracy of the SINR.

Example 1

The present example is an embodiment of the method for acquiring channel state information according to the present invention, and exemplarily illustrates how to use CQI as information for characterizing wireless channel quality, and determine the channel state where a user is located by using the CQI as a criterion, so as to dynamically adjust the transmission power of CSI-RS, and continuously obtain true and reliable downlink channel quality SINR. As shown in fig. 3, the present example comprises the following steps:

step 301, setting initial parameters.

In this example, the initial parameters set include: the length winLen of the sliding window is used for judging that the CQI threshold cqiThr1 with excellent channel quality is obtained, the CQI threshold cqiThr2 with extremely bad channel quality is obtained, the ratio threshold ueNumThr1 of the number of users with extremely good channel quality in a cell to the total number of users in the cell is obtained, the ratio threshold ueNumThr2 of the number of users with extremely bad channel quality in the cell to the total number of users in the cell is obtained, and the transmitting power default value P of the CSI-RS is obtained ₀ A power down offset α and a power up offset β.

In this example, the length winLen =8 of the sliding window is set, and the CQI gate which determines that the channel quality is excellent is determinedThe limit cqiThr1=15, the CQI threshold cqiThr2=1 is judged to be extremely bad, the ratio threshold ueNumThr1=0.4 of the number of users under extremely bad channel quality in the cell to the total number of users in the cell is given, the ratio threshold ueNumThr2=0.4 of the number of users under extremely bad channel quality in the cell to the total number of users in the cell is given, the default value P of the transmission power of the CSI-RS is given, and the channel quality is judged to be extremely bad ₀ =17.8dBm, power down offset α = -12dB, power up offset β =5dB.

The specific values of the parameters are selected through tests and belong to empirical values.

Step 302, obtaining the current CQI of each user, storing the CQI newly fed back by the user into a sliding window, and using winLen to represent the length of the sliding window (i.e. the number of CQIs that can be accommodated by the sliding window), where winLen =8 in this example, and fig. 2 is referred to as an implementation example of the sliding window. Note that, in this example, one sliding window is maintained for each user.

Step 303, sequentially judging the channel state of the user according to the CQI stored in the sliding window of each user; wherein the channel state includes: whether it is under excellent channel quality (i.e., whether it is excellent), and whether it is under very bad channel quality (i.e., whether it is very bad).

For a user, when all CQI's are greater than or equal to cqithre 1 in the user's sliding window, the user is considered to be under excellent channel quality;

for a user, when all CQIs are less than or equal to cqitro 2 in the sliding window of the user, the user is considered to be under extremely bad channel quality.

Step 304, respectively determining whether the ratio of the number of users with excellent channel quality in the cell to the total number of users in the cell is greater than or equal to a threshold ueNumThr1, and whether the ratio of the number of users with extremely bad channel quality in the cell to the total number of users in the cell is greater than or equal to a threshold ueNumThr2.

When the ratio of the number of users with excellent channel quality in the cell to the total number of users in the cell is greater than or equal to ueNumThr1, and the ratio of the number of users with extremely bad channel quality in the cell to the total number of users in the cell is less than ueNumThr2, the process goes to step 305;

when the ratio of the number of users with excellent channel quality in the cell to the total number of users in the cell is less than ueNumThr1, and the ratio of the number of users with extremely bad channel quality in the cell to the total number of users in the cell is greater than or equal to ueNumThr2, go to step 306;

when the ratio of the number of users with excellent channel quality in the cell to the total number of users in the cell is greater than or equal to ueNumThr1, and the ratio of the number of users with extremely bad channel quality in the cell to the total number of users in the cell is greater than or equal to ueNumThr2, go to step 305;

when the ratio of the number of users in the cell with excellent channel quality to the total number of users in the cell is less than ueNumThr1, and the ratio of the number of users in the cell with extremely bad channel quality to the total number of users in the cell is less than ueNumThr2, the process goes to step 302.

Step 305, reducing the transmission power of the CSI-RS: when CSI-RS is transmitted next time, its transmission power is reduced, i.e. P is used ₀ Transmitting with + alpha power; turning to step 307.

Step 306, raising the transmission power of the CSI-RS: when CSI-RS is transmitted next time, the transmitting power is raised, namely P is used ₀ Transmitting with + beta power; turning to step 307.

307, according to the CQI fed back by the CSI-RS after the user measures and adjusts the transmitting power _adjust Compensating to obtain a real downlink channel SINR in combination with the power adjustment amount α in step 305 or the power adjustment amount β in step 306;

in this example, the true downlink channel

Wherein,

is CQI _adjust The corresponding SINR;

step 308, repeating steps 302-307 to continuously obtain the true and reliable downlink channel SINR, i.e. turning to step 302.

Example two

The present example is an embodiment of the method for acquiring channel state information according to the present embodiment, and exemplarily illustrates how to use RSRP as information representing wireless channel quality, and determine a channel state where a user is located by using the RSRP as a criterion, so as to dynamically adjust transmission power of CSI-RS, and continuously obtain true and reliable downlink channel quality SINR. As shown in fig. 4, the present example comprises the following steps:

step 401, setting initial parameters.

In this example, the initial parameters set include: the length winLen of the sliding window is used for judging that the RSRP threshold rsrpThr1 of excellent channel quality is good, judging that the RSRP threshold rsrpThr2 of extremely bad channel quality is bad, the ratio threshold ueNumThr1 of the number of users under the excellent channel quality in a cell to the total number of users in the cell, the ratio threshold ueNumThr2 of the number of users under the extremely bad channel quality in the cell to the total number of users in the cell, and the transmitting power default value P of CSI-RS ₀ A power down offset α and a power up offset β.

In this example, setting the length winLen =8 of the sliding window, determining that the RSRP threshold rsrpThr1 of the channel quality is excellent-70 dBm, determining that the RSRP threshold rsrpThr2 of the channel quality is extremely bad-125 dBm, calculating the ratio threshold ueNumThr1 of the number of users under excellent channel quality in the cell to the total number of users in the cell as 0.4, calculating the ratio threshold ueNumThr2 of the number of users under extremely bad channel quality in the cell to the total number of users in the cell as 0.4, and calculating the default value P of the transmitting power of the csi-RS as a value ₀ =17.8dBm, power down offset α = -12dB, power up offset β =5dB.

Step 402, obtaining the current RSRP of each user, storing the RSRP newly fed back by the user into the sliding window, and representing the length of the sliding window by winLen (i.e. the number of RSRPs that can be accommodated by the sliding window), where winLen =8 in this example, and fig. 2 is referred to as an implementation example of the sliding window. Note that, in this example, one sliding window is maintained for each user.

Step 403, sequentially judging the channel state of the user according to the RSRP stored in each user sliding window; wherein the channel state includes: whether it is under an excellent channel quality (i.e., whether it is an excellent channel quality), and whether it is under an extremely bad channel quality (i.e., whether it is an extremely bad channel quality).

For a user, when all RSRPs are greater than or equal to rsrpThr1 in the user's sliding window, the user is considered to be under excellent channel quality;

for a user, the user is considered to be under extremely bad channel quality when all RSRPs are less than or equal to rsrpThr2 in the user's sliding window.

Step 404, respectively determining whether the ratio of the number of users with excellent channel quality in the cell to the total number of users in the cell is greater than or equal to a threshold ueNumThr1, and whether the ratio of the number of users with extremely bad channel quality in the cell to the total number of users in the cell is greater than or equal to a threshold ueNumThr2.

When the ratio of the number of users with excellent channel quality in the cell to the total number of users in the cell is greater than or equal to ueNumThr1, and the ratio of the number of users with extremely bad channel quality in the cell to the total number of users in the cell is less than ueNumThr2, go to step 405;

when the ratio of the number of users with excellent channel quality in the cell to the total number of users in the cell is less than ueNumThr1 and the ratio of the number of users with extremely bad channel quality in the cell to the total number of users in the cell is greater than or equal to ueNumThr2, go to step 406;

when the ratio of the number of users with excellent channel quality in the cell to the total number of users in the cell is greater than or equal to ueNumThr1, and the ratio of the number of users with extremely bad channel quality in the cell to the total number of users in the cell is greater than or equal to ueNumThr2, go to step 405;

when the ratio of the number of users in the cell with excellent channel quality to the total number of users in the cell is less than ueNumThr1, and the ratio of the number of users in the cell with extremely bad channel quality to the total number of users in the cell is less than ueNumThr2, the process goes to step 402.

Step 405, reducing the transmission power of the CSI-RS: when CSI-RS is transmitted next time, its transmission power is reduced, i.e. P is used ₀ Transmitting with + alpha power; proceed to step 407.

Step 406, raising the transmission power of the CSI-RS: when CSI-RS is transmitted next time, the transmitting power is raised, namely P is used ₀ Transmitting with + beta power; go to step 407.

Step 407, according to the CQI fed back by the CSI-RS after the user measures and adjusts the transmitting power _adjust And compensating to obtain the true downlink channel SINR in combination with the power adjustment amount α in step 405 or the power adjustment amount β in step 406 (the specific compensation manner is the same as that in the first example, and is not described here again).

Step 408, repeating steps 402-407 to continuously obtain the true and reliable downlink channel SINR, i.e. turning to step 402.

Example three

The present example is an embodiment of the method for acquiring channel state information according to the present invention, and exemplarily illustrates how to use SINR of SRS as information representing wireless channel quality, and determine the channel state where a user is located by using the SINR as a criterion, so as to dynamically adjust the transmission power of CSI-RS, thereby continuously obtaining a true and reliable downlink channel quality SINR. As shown in fig. 5, the present example comprises the following steps:

step 501, setting initial parameters.

In this example, the initial parameters set include: the length winLen of the sliding window, a threshold srsSINRThr1 of the SINR of the SRS judged to have excellent channel quality, a threshold srsSINRThr2 of the SINR of the SRS judged to have extremely bad channel quality, a threshold ueNumThr1 of the ratio of the number of users in the cell under the excellent channel quality to the total number of users in the cell, a threshold uemthr 2 of the ratio of the number of users in the cell under the extremely bad channel quality to the total number of users in the cell,default value P of transmission power of CSI-RS ₀ A power down offset α and a power up offset β.

In this example, the length winLen =8 of the sliding window is set, the threshold srssnrthr 1= -12dB of the SINR of the SRS determined to have excellent channel quality, the threshold srssnrthr 2=28dB of the SINR of the SRS determined to have extremely bad channel quality, the ratio threshold ueNumThr1=0.4 of the number of users having excellent channel quality in the cell to the total number of users in the cell, the ratio threshold ueNumThr2=0.4 of the number of users having extremely bad channel quality in the cell to the total number of users in the cell, the default value P of the transmission power of the csi-RS is set to be equal to or less than 0.4 of the number of users having extremely bad channel quality in the cell, and the default value P of the transmission power of the csi-RS is set to be equal to or less than 0.4 of the number of users in the cell ₀ =17.8dBm, power down offset α = -12dB, power up offset β =5dB.

Step 502, obtaining the SINR of the current SRS of each user, storing the SINR of the newly measured SRS of each user into a sliding window, and using winLen to indicate the length of the sliding window (i.e. the number of SINRs that can be accommodated by the sliding window), where winLen =8 in this embodiment, and fig. 2 is referred to as an implementation example of the sliding window. Note that, in this example, one sliding window is maintained for each user.

Step 503, sequentially judging the channel state of the user according to the SINR of the SRS stored in the sliding window of each user; wherein the channel state includes: whether under excellent channel quality (i.e., whether under excellent channel quality), whether under extremely bad channel quality (i.e., whether under extremely bad channel quality)

For a user, when the SINR of all SRS is greater than or equal to srsSINRThr1 in the sliding window of the user, the user is considered to be under excellent channel quality;

for a user, the user is considered to be under extremely bad channel quality when the SINR of all SRS is less than or equal to srssnrthr 2 in the user's sliding window.

Step 504, respectively determining whether the ratio of the number of users with excellent channel quality in the cell to the total number of users in the cell is greater than or equal to a threshold ueNumThr1, and whether the ratio of the number of users with extremely bad channel quality in the cell to the total number of users in the cell is greater than or equal to a threshold ueNumThr2.

When the ratio of the number of users with excellent channel quality in the cell to the total number of users in the cell is greater than or equal to ueNumThr1, and the ratio of the number of users with extremely bad channel quality in the cell to the total number of users in the cell is less than ueNumThr2, go to step 505;

when the ratio of the number of users with excellent channel quality in the cell to the total number of users in the cell is less than ueNumThr1 and the ratio of the number of users with extremely bad channel quality in the cell to the total number of users in the cell is greater than or equal to ueNumThr2, go to step 506;

when the ratio of the number of users with excellent channel quality in the cell to the total number of users in the cell is greater than or equal to ueNumThr1, and the ratio of the number of users with extremely bad channel quality in the cell to the total number of users in the cell is greater than or equal to ueNumThr2, go to step 505;

when the ratio of the number of users in the cell with excellent channel quality to the total number of users in the cell is less than ueNumThr1, and the ratio of the number of users in the cell with extremely bad channel quality to the total number of users in the cell is less than ueNumThr2, the process goes to step 502.

Step 505, reducing the transmission power of the CSI-RS: when CSI-RS is transmitted next time, its transmission power is reduced, i.e. P is used ₀ Transmitting with + alpha power; go to step 507.

Step 506, raising the transmission power of the CSI-RS: when CSI-RS is transmitted next time, the transmitting power is raised, namely P is used ₀ Transmitting with + beta power; proceed to step 507.

Step 507, according to the CQI fed back by the CSI-RS after the user measurement and adjustment of the transmitting power _adjust And compensating to obtain the true downlink channel SINR in combination with the power adjustment amount α in step 505 or the power adjustment amount β in step 106 (the specific compensation manner is the same as that in the first example, and is not described here again).

Step 508, repeat steps 502-507 to continuously obtain the true and reliable downlink channel SINR, i.e., turn to step 502.

Example four

The present example is an embodiment of a sliding window length adaptive adjustment algorithm, and an exemplary sliding window length adaptive adjustment algorithm is provided, according to which the length of a sliding window that maintains information characterizing the quality of a wireless channel is dynamically adjusted. As shown in fig. 6, the present example includes the following steps:

step 601, setting initial parameters.

In this embodiment, the set initial parameters include: the initial length winLen _ init of the sliding window is used for judging that the CQI threshold cqiThr1 with excellent channel quality is judged, the CQI threshold cqiThr2 with extremely bad channel quality is judged, the window length shortening threshold ratio Thr1, the window length shortening threshold ratio Thr2, the window length increasing factor p and the window length shortening factor q.

In this embodiment, an initial length winLen _ init =8 of the sliding window is set, a CQI threshold cqitthr 1=15 that is determined to have excellent channel quality, a CQI threshold cqitthr 2=1 that is determined to have extremely bad channel quality, a window length shortening threshold ratio thr1 (i.e., a third preset threshold) =0.6, a window length shortening threshold ratio thr2 (i.e., a fourth preset threshold) =0.6, a window length increase factor p =1.5, and a window length shortening factor q =1.5.

Step 602, determining whether the length of the sliding window needs to be changed according to the status of the information characterizing the quality of the wireless channel maintained in the sliding window.

In this example, the information characterizing the wireless channel quality maintained in the sliding window is taken as an example for description, and other information characterizing the wireless channel quality is analogized, and is not described herein again.

When all the CQIs in the sliding window are greater than or equal to cqitro 1, or all the CQIs are less than or equal to cqitro 2, go to step 603.

When the ratio of the number of CQIs greater than or equal to cqitro 1 in the sliding window to the length winLen of the current sliding window is less than the window length shortening threshold ratioth 1, or the ratio of the number of CQIs less than or equal to cqitro 2 in the sliding window to the length winLen of the current sliding window is less than the window length shortening threshold ratioth 2, go to step 604.

When the ratio of the number of CQIs greater than or equal to cqitro 1 in the sliding window to the length winLen of the current sliding window is greater than or equal to the window length shortening threshold ratioth 1, or the ratio of the number of CQIs less than or equal to cqitro 2 in the sliding window to the length winLen of the current sliding window is greater than or equal to the window length shortening threshold ratioth 2, go to step 605.

Step 603, increasing the window length, and expanding the length of the sliding window according to the following formula:

wherein, winLen ₁ To increase the length of the sliding window before, winLen ₂ To the increased length of the sliding window; turning to step 606.

Step 604, shortening the window length, wherein the length of the sliding window is shortened according to the following formula:

wherein, winLen ₃ To shorten the length of the sliding window before, winLen ₄ To shorten the length of the sliding window;

in the shortened sliding window, only the latest winLen is reserved ₄ Secondary CQI data; turning to step 606.

Step 605, maintaining the window length: keeping the current window length unchanged; turning to step 606.

Step 606, after storing new CQI in the next sliding window, repeating steps 601-605, and dynamically adjusting the length of the sliding window.

The embodiment of the invention firstly judges the channel state of the user according to the information representing the wireless channel quality as a criterion, adjusts the transmitting power of the CSI-RS according to the judging result, and then compensates and obtains the real downlink channel SINR according to the CQI reported by the CSI-RS after the user measuring power is adjusted and the power adjustment quantity, thereby improving various problems caused by the distortion of the downlink channel feedback information due to the limited measuring capability of user equipment or the limitation of the communication system feedback information and the like under the condition of excellent or extremely bad channel quality. In addition, in the embodiment of the invention, in a maintenance mode of a memory space for storing information representing the quality of a wireless channel, a sliding window length self-adaptive adjustment algorithm is adopted, so that the time for adjusting the CSI-RS power is optimized, and the practicability of the algorithm is improved.

It should be noted that, as the information for characterizing the quality of the wireless channel, the SINR of the CQI, RSRP and SRS is used in the embodiment of the present invention, which are only some preferred ways; in an actual embodiment, the channel state in which the user is located may be variously changed, and for example, the SINR of the uplink DMRS may be used.

Referring to fig. 7, another embodiment of the present invention provides an apparatus for acquiring channel state information, including:

an adjusting module 701, configured to adjust the transmission power of the reference signal when determining that the transmission power of the reference signal needs to be adjusted according to a ratio of the number of users with excellent channel quality in a cell to the total number of users in the cell and a ratio of the number of users with extremely bad channel quality in the cell to the total number of users in the cell, so as to send the reference signal with the adjusted transmission power;

an obtaining module 702, configured to receive a channel quality indicator CQI measured by a reference signal after adjusting transmission power, and determine a signal-to-noise ratio SINR of a downlink channel according to the CQI and a transmission power adjustment amount of the reference signal.

In the embodiment of the present invention, being in excellent channel quality means that the received power of the reference signal is too high, for example, being in excellent signal means that the received power of the reference signal is greater than or equal to a first preset power; the condition of being in the bad channel quality means that the received power of the reference signal is too low, for example, the condition of being in the bad signal means that the received power of the reference signal is less than or equal to a second preset power.

In this embodiment of the present invention, the adjusting module 701 is specifically configured to determine, according to a ratio of the number of users with excellent channel quality in a cell to the total number of users in the cell, and a ratio of the number of users with extremely bad channel quality in the cell to the total number of users in the cell, the transmission power of the reference signal that needs to be adjusted by using at least one of the following manners:

In this embodiment of the present invention, the adjusting module 701 is specifically configured to adjust the transmission power of the reference signal by using at least one of the following modes, and send the reference signal with the adjusted transmission power:

when the transmission power of the reference signal is determined to need to be reduced, reducing the transmission power of the reference signal, and sending the reference signal with the reduced transmission power; specifically, when the default value of the transmission power of the reference signal is P ₀ The power down offset is α (α)<0) When the reduced transmission power is P ₀ +α。

When the transmission power of the reference signal is determined to need to be increased, increasing the transmission power of the reference signal, and sending the reference signal with the increased transmission power; specifically, when the default value of the transmission power of the reference signal is P ₀ Offset of power ramp-up is beta (beta)>0) Then the transmission power after lifting is P ₀ +β。

In the embodiment of the present invention, the obtaining module 702 follows a formula

And determining the SINR of the downlink channel. Wherein, the SINR _real As the SINR of the downlink channel, the channel quality of the downlink channel,

in another embodiment of the present invention, the adjusting module 701 is further configured to:

determining the channel state of the user according to the information of the user characterizing the wireless channel quality; wherein the channel state comprises at least one of: whether the channel quality of the user is excellent or not and whether the channel quality of the user is excellent or not are judged;

CQI, reference Signal Received Power (RSRP), SINR of Sounding Reference Signal (SRS), SINR of DeModulation Reference Signal (DeModulation Reference Signal) in uplink, and the like.

In this embodiment of the present invention, the adjusting module 701 is specifically configured to determine the channel state of the user according to the information characterizing the quality of the wireless channel of the user by using at least one of the following manners:

when all the information representing the wireless channel quality in the sliding window of the user is greater than or equal to a first preset threshold, determining that the channel quality of the user is excellent;

For example, when the information characterizing the quality of the wireless channel is the CQI, a sliding window may be exemplarily used to maintain the obtained CQI for several times;

In another embodiment of the present invention, considering that for those user equipments that do not need to use the power-adjusted CSI-RS to measure the CQI, the variation of the CSI-RS power may introduce errors into the measurement and feedback of the CQI, so as to ensure the system performance, the frequency of transmitting the power-adjusted CSI-RS is maintained within a reasonable range, and then the adjusting module 701 is further configured to perform at least one of the following:

when determining that the length of the sliding window needs to be adjusted according to all the information characterizing the quality of the wireless channel in the sliding window, adjusting the length of the sliding window;

In the embodiment of the invention, whether the length of the sliding window needs to be adjusted or not can be judged when new information for representing the quality of the wireless channel is stored in the sliding window; or periodically judging whether the length of the sliding window needs to be adjusted or not; or other trigger conditions may be adopted, which is not limited in the embodiments of the present invention.

The adjusting module 701 is specifically configured to determine, according to all information characterizing the quality of the wireless channel in the sliding window, a length of the sliding window that needs to be adjusted by using at least one of the following manners:

determining that the length of the sliding window needs to be increased when all the information characterizing the radio channel quality in the sliding window indicates that the channel quality of the user is excellent, or all the information characterizing the radio channel quality in the sliding window indicates that the channel quality of the user is excellent; specifically, the length of the sliding window is expanded according to the following formula:

when the ratio of the number of the information representing the wireless channel quality indicating that the user is in the state of excellent channel quality to the length of the sliding window in the sliding window is smaller than a third preset threshold, or the ratio of the number of the information representing the wireless channel quality indicating that the user is in the state of extremely bad channel quality to the length of the sliding window in the sliding window is smaller than a fourth preset threshold, determining that the length of the sliding window needs to be shortened; specifically, the length of the sliding window is shortened according to the following formula:

Conversely, shortening the window length may make the UE easier to decide "in extreme channel conditions" and eventually cause the frequency triggering "adjusting CSI-RS power" to increase.

The adjusting module 701 is specifically configured to determine, according to all the information characterizing the quality of the wireless channel in the sliding window, that the length of the sliding window does not need to be adjusted by using the following method:

In another embodiment of the present invention, the adjusting module 701 is further configured to: initial parameters are set.

The embodiment of the invention adjusts the transmitting power of the reference signal when determining that the transmitting power of the reference signal needs to be adjusted based on the proportion of the number of users with excellent channel quality in a cell to the total number of users in the cell and the proportion of the number of users with extremely bad channel quality in the cell to the total number of users in the cell, determines the signal to noise ratio (SINR) of a downlink channel based on the CQI measured by the reference signal after the transmitting power is adjusted and the transmitting power adjustment quantity of the reference signal, reduces the error caused by the limitation of the measuring capability of user equipment or the limitation of feedback information when the users have excellent or extremely bad channel quality, and improves the accuracy of the SINR.

Another embodiment of the present invention provides an apparatus for acquiring channel state information, which includes a processor and a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, and when the instructions are executed by the processor, the apparatus implements any one of the above methods for acquiring channel state information.

Another embodiment of the present invention proposes a computer-readable storage medium, on which a computer program is stored, which when executed by a processor, implements the steps of any one of the above methods for acquiring channel state information.

Those skilled in the art should understand that the functions of each processing module in the algorithm of this patent can be realized by a program running on a processor, and can also be realized by a specific logic circuit, such as: may be implemented by a Central Processing Unit (CPU), microprocessor (MPU), digital Signal Processor (DSP), or Field Programmable Gate Array (FPGA).

In the embodiments provided in the present invention, it should be understood that the disclosed method and apparatus can be implemented in other ways. The above-described device embodiments are merely illustrative, for example, the division of the modules is only one logical functional division, and other division manners may be implemented in practice, for example: multiple modules or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the communication connections between the components shown or discussed may be through interfaces, indirect couplings or communication connections of devices or modules, and may be electrical, mechanical or other.

The modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical modules, may be located in one place, or may be distributed on a plurality of network modules; some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, all functional modules in the embodiments of the present invention may be integrated into one processing module, or each module may be separately used as one module, or two or more modules may be integrated into one module; the integrated module can be realized in a hardware mode, and can also be realized in a mode of hardware and a software functional module.

All or part of the steps for realizing the method embodiments can be completed by hardware related to program instructions, the program can be stored in a computer readable storage medium, and the program executes the steps comprising the method embodiments when executed; and the aforementioned storage medium includes: various media that can store program codes, such as a removable Memory device, a Read-Only Memory (ROM), a magnetic disk, or an optical disk.

It will be understood by those of ordinary skill in the art that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, or suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.

Although the embodiments of the present invention have been described above, the descriptions are only used for understanding the embodiments of the present invention, and are not intended to limit the embodiments of the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the embodiments of the invention as defined by the appended claims.

Claims

1. A method of obtaining channel state information, comprising:

2. The method of claim 1, wherein before determining that the transmit power of the reference signal needs to be adjusted based on the ratio of the number of users in the cell with excellent channel quality to the total number of users in the cell, and the ratio of the number of users in the cell with bad channel quality to the total number of users in the cell, the method further comprises:

3. The method of claim 2, wherein the determining the channel state of the user according to the information characterizing the quality of the wireless channel comprises at least one of:

4. The method of claim 3, wherein prior to determining the channel state of the user based on the information characterizing the quality of the wireless channel, the method further comprises at least one of:

5. The method of claim 4, wherein the determining that the length of the sliding window needs to be adjusted according to all the information characterizing the quality of the wireless channel in the sliding window comprises at least one of:

determining that the length of the sliding window needs to be increased when all the information characterizing the radio channel quality in the sliding window indicates that the channel quality of the user is excellent, or all the information characterizing the radio channel quality in the sliding window indicates that the channel quality of the user is excellent;

and when the ratio of the number of the information representing the wireless channel quality indicating that the user is in the extremely good channel quality to the length of the sliding window in the sliding window is smaller than a third preset threshold, or the ratio of the number of the information representing the wireless channel quality indicating that the user is in the extremely bad channel quality to the length of the sliding window in the sliding window is smaller than a fourth preset threshold, determining that the length of the sliding window needs to be shortened.

6. The method of claim 1, wherein the determining that the transmission power of the reference signal needs to be adjusted according to the ratio of the number of users with excellent channel quality in the cell to the total number of users in the cell, and the ratio of the number of users with extremely bad channel quality in the cell to the total number of users in the cell comprises at least one of:

and when the proportion of the number of the users with excellent channel quality in the cell to the total number of the users in the cell is smaller than a first preset proportion, and the proportion of the number of the users with extremely bad channel quality in the cell to the total number of the users in the cell is larger than or equal to a second preset proportion, determining that the transmitting power of the reference signal needs to be increased.

7. The method of claim 6, wherein the adjusting the transmission power of the reference signal, and the transmitting the reference signal at the adjusted transmission power comprises at least one of:

when the transmission power of the reference signal is determined to need to be reduced, reducing the transmission power of the reference signal, and sending the reference signal with the reduced transmission power;

and when the transmission power of the reference signal is determined to be required to be increased, increasing the transmission power of the reference signal, and sending the reference signal with the increased transmission power.

8. The method of claim 1, wherein the determining the SINR of the downlink channel according to the CQI and the adjustment amount of the transmission power of the reference signal comprises:

according to the formula

Determining the SINR of a downlink channel;

wherein, the SINR _real As the SINR of the downlink channel,

is CQI _adjust The corresponding SINR; CQI _adjust A CQI measured for a reference signal after adjusting a transmission power;

α is a power down offset and β is a power up offset。

9. An apparatus for acquiring channel state information, comprising:

10. An apparatus for acquiring channel state information, comprising a processor and a computer-readable storage medium having instructions stored therein, wherein the instructions, when executed by the processor, implement the method for acquiring channel state information according to any one of claims 1 to 8.

11. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of acquiring channel state information according to any one of claims 1 to 8.