WO2020186916A1 - Procédé et appareil d'acquisition d'informations d'état de canal - Google Patents

Procédé et appareil d'acquisition d'informations d'état de canal Download PDF

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Publication number
WO2020186916A1
WO2020186916A1 PCT/CN2020/071773 CN2020071773W WO2020186916A1 WO 2020186916 A1 WO2020186916 A1 WO 2020186916A1 CN 2020071773 W CN2020071773 W CN 2020071773W WO 2020186916 A1 WO2020186916 A1 WO 2020186916A1
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Prior art keywords
users
cell
channel quality
reference signal
sliding window
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PCT/CN2020/071773
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English (en)
Chinese (zh)
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蒲磊
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中兴通讯股份有限公司
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/336—Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/32—TPC of broadcast or control channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/32—TPC of broadcast or control channels
    • H04W52/325—Power control of control or pilot channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices

Definitions

  • the embodiments of the present application relate to, but are not limited to, the field of communication technology, for example, to a method and device for acquiring channel state information.
  • the base station needs to obtain downlink channel quality information (Downlink Channel Quality Information) before transmitting data to user equipment (UE), and select the modulation and coding suitable for the current channel state according to the downlink channel quality information Scheme (Modulation and Coding Scheme, MCS).
  • Downlink Channel Quality Information Downlink Channel Quality Information
  • MCS Modulation and Coding Scheme
  • CSI-RS Channel State Information-Reference Signal
  • MCS Modulation and Coding Scheme
  • Knowing the accurate downlink channel quality status is of vital importance.
  • the following goals can be achieved through the downlink channel quality status: 1) Choose a reasonable downlink scheduling strategy according to the channel status of the UE; 2) Improve the user's downlink throughput; 3 ) Effectively control the Block Error Ratio (BLER) and so on.
  • BLER Block Error Ratio
  • the UE when the UE measures CSI-RS, it will measure the received power, interference power and noise of the received CSI-RS, and calculate the received CSI-RS based on the received power, interference power and noise Signal to Interference plus Noise Ratio (SINR), and use this to estimate the quality of the downlink channel, and then calculate the physical downlink shared channel (Physical Downlink Shared Channel, PDSCH) used to transmit downlink service data Use a reasonable modulation and coding strategy (Modulation and Coding Scheme, MCS).
  • SINR Signal to Interference plus Noise Ratio
  • CSI- The received power of the RS will be too high and too low. Due to the dynamic range of the UE's power measurement, the UE will not be able to measure the true CSI-RS received power, or the feedback information in the communication system is limited (such as CQI Report field limit), the CQI reported by the UE to the base station will be far from the real downlink channel quality. In this case, after the base station receives the distorted CQI fed back by the user, it calculates the CSI received by the UE based on this CQI. -When the SINR is at RS, an inaccurate result will be obtained.
  • PMI Precoding Matrix Indicator
  • the embodiments of the present application provide a method and device for acquiring channel state information, which can improve the accuracy of channel state information when a user is in extremely good or extremely bad channel quality.
  • the embodiment of the application provides a method for acquiring channel state information, including:
  • the embodiment of the present application provides an apparatus for acquiring channel state information, including:
  • the adjustment module is set to determine the need to adjust the reference signal 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 In the case of transmitting power of, adjusting the transmitting power of the reference signal, and transmitting the reference signal with the adjusted transmitting power;
  • the acquiring module is configured to receive the channel quality indicator CQI measured by the reference signal after adjusting the transmission power, and determine the signal-to-noise ratio SINR of the downlink channel according to the CQI and the transmission power adjustment amount of the reference signal.
  • the embodiment of the present application provides an apparatus for acquiring channel state information, including a processor and a computer-readable storage medium.
  • the computer-readable storage medium stores instructions. When the instructions are executed by the processor, Any of the above methods for acquiring channel state information.
  • the embodiment of the present application provides a computer-readable storage medium on which a computer program is stored.
  • the computer program is executed by a processor, the steps of any one of the foregoing methods for acquiring channel state information are implemented.
  • FIG. 1 is a flowchart of a method for acquiring channel state information proposed by an embodiment of this application
  • FIG. 2 is a schematic diagram of a sliding window according to an embodiment of the application.
  • FIG. 3 is a flowchart of a method for acquiring channel state information proposed in Example 1 of an embodiment of the application;
  • Example 4 is a flowchart of a method for acquiring channel state information proposed in Example 2 of an embodiment of the application;
  • Example 5 is a flowchart of a method for acquiring channel state information proposed in Example 3 of an embodiment of the application;
  • Example 6 is a flowchart of the method for acquiring channel state information proposed in Example 4 of the embodiment of the application;
  • FIG. 7 is a schematic structural composition diagram of an apparatus for acquiring channel state information proposed by another embodiment of the application.
  • an embodiment of the present application proposes a method for acquiring channel state information, including:
  • Step 1010 When the ratio of the number of users with extremely good 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 in determining the need to adjust the transmission of the reference signal is determined In the case of power, the transmission power of the reference signal is adjusted, and the reference signal is sent with the adjusted transmission power.
  • the reference signal may be any reference signal, for example, the reference signal includes: CSI-RS.
  • being at excellent channel quality means that the received power of the reference signal is too high, for example, being at excellent signal means that the received power of the reference signal is greater than or equal to the first preset power; being at extremely bad channel quality is It means that the received power of the reference signal is too low. For example, when the signal is extremely bad, it means that the received power of the reference signal is less than or equal to the second preset power.
  • the ratio of the number of users with extremely good channel quality 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 determines the need to adjust the reference
  • the transmission power of the signal includes at least one of the following: 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 the first preset ratio, it is determined that the transmission of the reference signal needs to be reduced Power; when the ratio of the number of users with extremely good channel quality to the total number of users in the cell is less than the first preset ratio, and the number of users with extremely bad channel quality in the cell accounts for the total number of users in the cell When the ratio is greater than or equal to the second preset ratio, it is determined that the transmission power of the reference signal needs to be raised (that is, increased).
  • 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 the first preset ratio includes at least one of the following situations: The ratio of the number of users to the total number of users in the cell is greater than or equal to the first preset ratio, and the ratio of the number of users with extremely poor channel quality in the cell to the total number of users in the cell is greater than or equal to the second preset ratio; The ratio of the number of users with extremely good channel quality to the total number of users in the cell is greater than or equal to the first preset ratio, 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 Less than the second preset ratio.
  • the transmission power of the reference signal is reduced; while in the cell, the number of users with excellent channel quality is small, and the number of users with extremely bad channel quality is large.
  • Increase the transmit power of the reference signal so that the dynamic range of the received power of the reference signal is reduced, which reduces the situation that the received power of the reference signal is outside the dynamic range of the user's power measurement and the limitation of the reported CQI in the CQI report field range
  • the accuracy of the feedback CQI is improved, that is, the accuracy of the SINR is improved, and the situation that the PMI reported multiple times at the very close point presents irregular and random jumps is further reduced.
  • adjusting the transmission power of the reference signal and sending the reference signal with the adjusted transmission power includes at least one of the following:
  • the transmission power of the reference signal When it is determined that the transmission power of the reference signal needs to be reduced, the transmission power of the reference signal is reduced, and the reference signal is transmitted with the reduced transmission power.
  • the default value of the transmission power of the reference signal is P0 and the power reduction offset is ⁇ ( ⁇ 0)
  • the reduced transmission power is P0+ ⁇ .
  • the transmission power of the reference signal is increased, and the reference signal is transmitted with the increased transmission power.
  • the default value of the transmission power of the reference signal is P0 and the power increase offset is ⁇ ( ⁇ >0)
  • the increased transmission power is P0+ ⁇ .
  • Step 1020 Receive the CQI measured by the reference signal after adjusting the transmission power, and determine the SINR of the downlink channel according to the CQI and the transmission power adjustment amount of the reference signal.
  • SINR real is the SINR of the downlink channel
  • CQI adjust (CQI adjust ) corresponding to the SINR
  • CQI adjust is the CQI measured by the reference signal after adjusting the transmit power
  • the need is determined 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 characterizing the wireless channel quality of the user; wherein the channel state includes at least one of the following: whether the user is The channel quality is extremely good, whether the user is in extremely bad channel quality; according to the channel state of the user in the cell, the ratio of the number of users with extremely good channel quality to the total number of users in the cell is calculated, and The ratio of the number of users with extremely bad channel quality to the total number of users in the cell.
  • the information that characterizes the quality of the wireless channel may be diverse.
  • the information that characterizes the wireless channel quality includes at least one of the following: CQI, Reference Signal Received Power (RSRP), SINR of Sounding Reference Signal (SRS), and Uplink Demodulation Reference Signal (DeModulation) Reference Signal, DMRS) SINR, etc.
  • the embodiment of the present application does not limit the foregoing information that characterizes the quality of the wireless channel, and may come from a terminal device or a network device.
  • determining the channel state of the user according to the information characterizing the wireless channel quality 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 When it is greater than or equal to the first preset threshold, it is determined that the user has excellent channel quality; when all the information characterizing the wireless channel quality in the sliding window of the user is less than or equal to the second preset threshold, it is determined The user is in extremely bad channel quality.
  • the sliding window is used to maintain user information that characterizes the quality of the wireless channel.
  • the sliding window Refer to Figure 2 for an implementation example of the sliding window.
  • one sliding window can be maintained for each user.
  • a sliding window may be used exemplarily to maintain the CQI acquired several times.
  • a sliding window can be used exemplarily to maintain the RSRP acquired several times.
  • a sliding window may be used exemplarily to maintain the SINR of the SRS acquired several times.
  • the The method further includes at least one of the following: when it is determined 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; when according to the sliding window When it is determined that the length of the sliding window does not need to be adjusted by all the information that characterizes the quality of the wireless channel in, the length of the sliding window is maintained unchanged.
  • 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 the following:
  • the length of the sliding window is expanded according to the following formula: Among them, winLen 1 is the length of the sliding window before the increase, winLen 2 is the length of the sliding window after the increase, and p is the window length growth factor.
  • the sliding window indicates that the user is at an excellent channel quality
  • the ratio of the number of information characterizing the wireless channel quality to the length of the sliding window is less than a third preset threshold, or the sliding window indicates that
  • the ratio of the number of information characterizing the quality of the wireless channel and the length of the sliding window where the user is in extremely bad channel quality is less than a fourth preset threshold
  • the method for judging whether it is under extreme channel conditions is to judge whether all the information that characterizes the quality of the wireless channel in the sliding window of the UE is an extreme value. Since the elements in the sliding window are periodically updated one by one, the shorter the window length, the easier it is to be judged as "UE is under extreme channel conditions" (assuming the window length is 1, then as long as there is an extreme characterization wireless The information value of the channel quality, the UE will be judged as "under extreme channel conditions"), on the contrary, the longer the window length, the more difficult it is to be judged as "the UE under extreme channel conditions" (assuming the window length is 100, Then the 100 pieces of information that characterize the quality of the wireless channel in the required window are all extreme values before the UE will be judged as "under extreme channel conditions”).
  • shortening the window length can make it easier for the UE to be judged as “under extreme channel conditions", and ultimately increase the frequency of triggering "adjusting CSI-RS power”.
  • the sliding window length adaptive adjustment algorithm can reasonably adjust the window length of each UE, and ultimately makes the frequency of triggering "adjusting CSI-RS power" not too high or too low.
  • 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 includes: when the sliding window indicates that the user is in an excellent channel quality The ratio of the number of information characterizing wireless channel quality to the length of the sliding window is greater than or equal to a third preset threshold, or the sliding window indicates that the user is in the characterizing wireless channel quality with extremely bad channel quality When the ratio of the number of information to the length of the sliding window is greater than or equal to the fourth preset threshold, it is determined that the length of the sliding window does not need to be adjusted.
  • the method further includes: setting initial parameters .
  • the initial parameters include: the length of the sliding window, the threshold (ie, the first preset threshold) that is determined to be the information indicating the quality of the wireless channel as having excellent channel quality, and the wireless channel quality that is determined as the extremely bad channel quality.
  • the threshold of the information i.e., the second preset threshold
  • the ratio of the number of users in the cell with excellent channel quality to the total number of users in the cell i.e. the first preset ratio
  • the threshold of the ratio of the number of users to the total number of users in the cell ie, the second preset ratio
  • the default value of the transmission power of the reference signal the power down offset, and the power up offset.
  • the embodiments of this application determine the need to adjust the transmission of the reference signal based on the ratio of the number of users with extremely good channel quality 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.
  • Power adjust the transmit power of the reference signal, and determine the signal-to-noise ratio SINR of the downlink channel based on the CQI measured by the reference signal after adjusting the transmit power and the transmit power adjustment amount of the reference signal.
  • the channel quality is extremely bad, the error caused by the limited measurement capability of the user equipment or the limited feedback information is reduced, and the accuracy of the SINR is improved.
  • This example is an embodiment of the method for acquiring channel state information according to the embodiments of the application. It exemplarily explains how to use CQI as information to characterize the quality of the wireless channel, and use it as a criterion to determine the channel state of the user, and then Dynamically adjust the transmission power of CSI-RS to continuously obtain true and reliable downlink channel quality SINR. As shown in Figure 3, this example includes the following steps:
  • Step 3010 Set initial parameters.
  • the initial parameters set include: the length of the sliding window winLen, the CQI threshold cqiThr1 that is judged to be extremely good channel quality, the CQI threshold cqiThr2 that is judged to be extremely bad channel quality, and the number of users in the cell under extremely good channel quality
  • the ratio threshold ueNumThr1 of the total number of users in the cell, 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, the default value of CSI-RS transmission power P0, the power drop offset ⁇ , The power lift offset ⁇ .
  • Step 3020 Obtain the current CQI of each user, and store the new CQI feedback from the user in the sliding window.
  • Step 3030 According to the CQIs stored in the sliding windows of multiple users, determine the channel status of the user in turn; wherein, the channel status includes: whether it is under excellent channel quality (that is, whether it is under excellent channel quality), Whether the channel quality is extremely bad (that is, whether the channel quality is extremely bad).
  • Step 3040 Determine whether the ratio of the number of users with extremely good channel quality to the total number of users in the cell is greater than or equal to the 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 determined respectively Greater than or equal to the threshold ueNumThr2.
  • Step 3050 reduce the transmission power of the CSI-RS: when the CSI-RS is transmitted next time, reduce the transmission power of the CSI-RS, that is, use P0+ ⁇ power for transmission; go to step 3070.
  • Step 3060 increase the transmission power of the CSI-RS: when the CSI-RS is transmitted next time, increase the transmission power of the CSI-RS, that is, use P0+ ⁇ power for transmission; go to step 3070.
  • Step 3070 According to the CQI adjust fed back by the CSI-RS after adjusting the transmission power measured by the user, combined with the power adjustment amount ⁇ in step 3050 or the power adjustment amount ⁇ in step 3060, the true downlink channel SINR is compensated by compensation.
  • the real downlink channel the real downlink channel
  • SINR corresponding to CQI adjust are SINR corresponding to CQI adjust ;
  • Step 3080 repeat steps 3020-3070 to continuously obtain the true and reliable downlink channel SINR, that is, go to step 3020.
  • This example is an embodiment of the method for obtaining channel state information according to the embodiments of the application. It exemplarily explains how to use RSRP as the information characterizing the quality of the wireless channel, and use it as a criterion to determine the channel state of the user, and then Dynamically adjust the transmission power of CSI-RS to continuously obtain true and reliable downlink channel quality SINR. As shown in Figure 4, this example includes the following steps:
  • Step 4010 Set initial parameters.
  • the initial parameters set include: the length of the sliding window winLen, the RSRP threshold rsrpThr1 judged as having excellent channel quality, the RSRP threshold rsrpThr2 judged as having extremely bad channel quality, and the number of users in the cell under excellent channel quality
  • the ratio threshold ueNumThr1 of the total number of users in the cell, 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, the default value of CSI-RS transmission power P0, the power drop offset ⁇ , The power lift offset ⁇ .
  • Step 4020 Obtain the current RSRP of each user, and store the new RSRP feedback from the user in the sliding window.
  • Step 4030 According to the RSRP stored in the sliding windows of multiple users, determine the channel status of the user in turn; wherein, the channel status includes: whether it is under excellent channel quality (that is, whether it is under excellent channel quality), Whether the channel quality is extremely bad (that is, whether the channel quality is extremely bad).
  • Step 4040 Determine whether the ratio of the number of users with extremely good channel quality to the total number of users in the cell is greater than or equal to the 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 determined respectively Greater than or equal to the threshold ueNumThr2.
  • Step 4050 reduce the transmission power of the CSI-RS: when the CSI-RS is transmitted next time, reduce the transmission power of the CSI-RS, that is, use the P0+ ⁇ power for transmission; go to step 4070.
  • Step 4060 increase the transmission power of the CSI-RS: when the CSI-RS is transmitted next time, increase the transmission power of the CSI-RS, that is, use P0+ ⁇ power for transmission; go to step 4070.
  • Step 4070 According to the CQI adjust fed back by the CSI-RS after adjusting the transmission power measured by the user, combined with the power adjustment amount ⁇ in step 4050 or the power adjustment amount ⁇ in step 4060, the real downlink channel SINR is compensated (specific compensation method) Same as example one, no more details here).
  • Step 4080 repeat steps 4020-4070 to continuously obtain the true and reliable downlink channel SINR, that is, go to step 4020.
  • This example is an embodiment of the method for obtaining channel state information according to the embodiments of the application. It exemplarily illustrates how to use the SINR of the SRS as the information to characterize the quality of the wireless channel, and use it as a criterion to determine the channel state of the user , And then dynamically adjust the CSI-RS transmit power to continuously obtain a true and reliable downlink channel quality SINR. As shown in Figure 5, this example includes the following steps:
  • Step 5010 Set initial parameters.
  • the initial parameters set include: the length of the sliding window winLen, the threshold srsSINRThr1 of the SINR judged as the SRS with extremely good channel quality, and the threshold srsSINRThr2 of the SINR judged as the SRS with extremely bad channel quality.
  • Threshold ueNumThr1 the ratio of the number of users under channel quality to the total number of users in the cell ueNumThr1
  • CSI-RS transmit power default value P0, power Decrease offset ⁇ , power increase offset ⁇ .
  • Step 5020 Obtain the SINR of each user's current SRS, and store the newly measured SINR of each user's SRS in the sliding window.
  • Step 5030 According to the SINR of the SRS stored in the sliding windows of the multiple users, determine the channel state of the user in turn; where the channel state includes: whether the channel quality is under excellent channel quality (that is, whether the channel quality is excellent ), whether it is under extremely bad channel quality (that is, whether it is under extremely bad channel quality)
  • the user when the SINR of all SRSs in the sliding window of the user is greater than or equal to srsSINRThr1, the user is considered to be under excellent channel quality.
  • the SINR of all SRSs in the sliding window of the user is less than or equal to srsSINRThr2, the user is considered to be under extremely bad channel quality.
  • Step 5040 Determine whether the ratio of the number of users with extremely good channel quality to the total number of users in the cell is greater than or equal to the 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 determined respectively Greater than or equal to the threshold ueNumThr2.
  • Step 5050 reduce the transmission power of the CSI-RS: when the CSI-RS is transmitted next time, reduce the transmission power of the CSI-RS, that is, use P0+ ⁇ power for transmission; go to step 5070.
  • Step 5060 increase the transmission power of the CSI-RS: when the CSI-RS is transmitted next time, increase the transmission power of the CSI-RS, that is, use the P0+ ⁇ power for transmission; go to step 5070.
  • Step 5070 According to the CQI adjust fed back by the CSI-RS after adjusting the transmit power measured by the user, combined with the power adjustment amount ⁇ in step 5050 or the power adjustment amount ⁇ in step 5060, the real downlink channel SINR is compensated for (specific compensation method Same as example one, no more details here).
  • Step 5080 repeat steps 5020-5070 to continuously obtain the true and reliable downlink channel SINR, that is, go to step 5020.
  • This example is an embodiment of a sliding window length adaptive adjustment algorithm, which exemplarily provides an adaptive sliding window length adjustment algorithm, according to which the length of the sliding window that maintains information characterizing the wireless channel quality is dynamically adjusted. As shown in Figure 6, this example includes the following steps:
  • Step 6010 Set initial parameters.
  • the initial parameters set include: the initial length of the sliding window winLen_init, the CQI threshold cqiThr1 judged as having excellent channel quality, the CQI threshold cqiThr2 judged as having extremely bad channel quality, the window length shortening threshold ratioThr1, and the window length shortening Threshold ratioThr2, window length growth factor p, window length shortening factor q.
  • Step 6020 Determine whether the length of the sliding window needs to be changed according to the status of the information representing the quality of the wireless channel maintained in the sliding window.
  • the information that is maintained in the sliding window that characterizes the quality of the wireless channel is CQI as an example for description, and other information that characterizes the quality of the wireless channel can be deduced by analogy, and will not be repeated here.
  • Step 6030 increase the window length, and expand the length of the sliding window according to the following formula: Among them, winLen 1 is the length of the sliding window before the increase, and winLen 2 is the length of the sliding window after the increase; go to step 6060.
  • Step 6040 shorten the length of the window, and shorten the length of the sliding window according to the following formula: Among them, winLen 3 is the length of the sliding window before shortening, and winLen 4 is the length of the sliding window after shortening;
  • Step 6050 maintain the window length: maintain the current window length unchanged; go to step 6060.
  • Step 6060 after the new CQI is stored in the next sliding window, repeat steps 6010-6050 to dynamically adjust the length of the sliding window.
  • the embodiment of this application first judges the channel state of the user according to the information characterizing the wireless channel quality as a criterion, and adjusts the transmission power of the CSI-RS accordingly, and then adjusts the CSI-RS reported according to the user's measured power CQI, combined with the amount of power adjustment, compensates to obtain the true downlink channel SINR, thereby improving the situation that exists in the case of extremely good or extremely bad channel quality due to limited user equipment measurement capabilities or limited feedback information of the communication system.
  • Various problems caused by distortion of the incoming downlink channel feedback information adopts a sliding window length adaptive adjustment algorithm in the maintenance method of the memory space storing the information characterizing the wireless channel quality, which optimizes the timing of CSI-RS power adjustment and improves the practicality of the algorithm.
  • the SINR of CQI, RSRP and SRS are used in the embodiments of this application. These are just a few optional methods; in actual implementation, it can be Various, for example, the SINR of the uplink DMRS can also be used to perceive the channel state of the user.
  • an apparatus for acquiring channel state information including: an adjustment module 701, configured to: according to the ratio of the number of users in a cell with excellent channel quality to the total number of users in the cell, And the ratio of the number of users with extremely poor channel quality in the cell to the total number of users in the cell.
  • the acquiring module 702 is configured to receive the channel quality indicator CQI measured by the reference signal after adjusting the transmission power, and determine the signal-to-noise ratio SINR of the downlink channel according to the CQI and the transmission power adjustment amount of the reference signal.
  • the reference signal may be any reference signal, for example, the reference signal includes: CSI-RS.
  • being at excellent channel quality means that the received power of the reference signal is too high, for example, being at excellent signal means that the received power of the reference signal is greater than or equal to the first preset power; being at extremely bad channel quality is It means that the received power of the reference signal is too low. For example, when the signal is extremely bad, it means that the received power of the reference signal is less than or equal to the second preset power.
  • the adjustment module 701 is configured to adopt at least one of the following methods to realize the ratio of the number of users with extremely good channel quality in the cell to the total number of users in the cell, and the users with extremely bad channel quality in the cell
  • the ratio of the number to the total number of users in the cell determines the need to adjust the transmission power of the reference signal: 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 the first preset ratio, determine The transmission power of the reference signal needs to be reduced; 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 the first preset ratio, and the users with extremely bad channel quality in the cell
  • the ratio of the number to the total number of users in the cell is greater than or equal to the second preset ratio, it is determined that the transmission power of the reference signal needs to be increased (that is, increased).
  • 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 the first preset ratio includes at least one of the following situations: The ratio of the number of users to the total number of users in the cell is greater than or equal to the first preset ratio, and the ratio of the number of users with extremely poor channel quality in the cell to the total number of users in the cell is greater than or equal to the second preset ratio; The ratio of the number of users with extremely good channel quality to the total number of users in the cell is greater than or equal to the first preset ratio, 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 Less than the second preset ratio.
  • the transmission power of the reference signal is reduced; while in the cell, the number of users with excellent channel quality is small, and the number of users with extremely bad channel quality is large.
  • Increase the transmit power of the reference signal so that the dynamic range of the received power of the reference signal is reduced, which reduces the situation that the received power of the reference signal is outside the dynamic range of the user's power measurement and the limitation of the reported CQI in the CQI report field range
  • the accuracy of the feedback CQI is improved, that is, the accuracy of the SINR is improved, and the situation that the PMI reported multiple times at the very close point presents irregular and random jumps is further reduced.
  • the adjustment module 701 is configured to adjust the transmission power of the reference signal in at least one of the following ways, and transmit the reference signal with the adjusted transmission power: when it is determined that the reference signal needs to be reduced When transmitting power, the transmission power of the reference signal is reduced, and the reference signal is transmitted with the reduced transmission power; specifically, when the default value of the transmission power of the reference signal is P0, the power reduction offset is ⁇ ( ⁇ 0 ), the reduced transmit power is P0+ ⁇ .
  • the transmission power of the reference signal is increased, and the reference signal is transmitted with the increased transmission power; specifically, when the default value of the transmission power of the reference signal is P0, the power is increased When the offset is ⁇ ( ⁇ >0), the raised transmit power is P0+ ⁇ .
  • the obtaining module 702 follows the formula Determine the SINR of the downlink channel.
  • SINR real is the SINR of the downlink channel, CQI adjust for the corresponding SINR; CQI adjust the reference signal that is measured by the adjusting transmit power of the CQI;
  • the adjustment module 701 is further configured to: determine the channel state of the user according to the information characterizing the wireless channel quality of the user; wherein the channel state includes at least one of the following: Whether the user is in extremely good channel quality and whether the user is in extremely bad channel quality; calculate the ratio of the number of users with extremely good channel quality in the cell to the total number of users in the cell according to the channel state of the user 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 information that characterizes the quality of the wireless channel may be diverse.
  • the information characterizing the quality of the wireless channel includes at least one of the following: CQI, RSRP, SINR of SRS, SINR of DMRS, and so on.
  • the embodiment of the present application does not limit the foregoing information that characterizes the quality of the wireless channel, and may come from a terminal device or a network device.
  • the adjustment module 701 is configured to use at least one of the following methods to determine the channel state of the user according to the information characterizing the wireless channel quality of the user: when all the channels in the sliding window of the user are When the information characterizing the quality of the wireless channel is greater than or equal to the first preset threshold, it is determined that the user has excellent channel quality; when all the information characterizing the quality of the wireless channel in the sliding window of the user is less than or equal to At the second preset threshold, it is determined that the user is in extremely bad channel quality.
  • the sliding window is used to maintain user information that characterizes the quality of the wireless channel.
  • FIG 2 for an implementation example of the sliding window. It should be noted that a sliding window can be maintained for each user.
  • a sliding window may be used exemplarily to maintain the CQI acquired several times.
  • a sliding window can be used exemplarily to maintain the RSRP acquired several times.
  • a sliding window may be used exemplarily to maintain the SINR of the SRS acquired several times.
  • the adjustment module 701 is also set to perform at least one of the following: When it is determined that the length of the sliding window needs to be adjusted by the information characterizing the quality of the wireless channel, the length of the sliding window is adjusted; when it is determined that 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 The length of the sliding window remains unchanged.
  • the adjustment module 701 is configured to use at least one of the following methods to realize the determination 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: when all the information in the sliding window is The information that characterizes the quality of the wireless channel indicates that the user is at extremely good channel quality, or all the information that indicates the quality of the wireless channel in the sliding window indicates that the user is at extremely bad channel quality.
  • winLen 1 is the length of the sliding window before the increase
  • winLen 2 is the length of the sliding window after the increase
  • p is the window length growth factor
  • winLen 3 is the length of the sliding window before shortening
  • winLen 4 is the length of the shortened sliding window
  • q is the window length shortening factor
  • winLen_init is the initial length of the sliding window.
  • the method for judging whether it is under extreme channel conditions is to judge whether all the information that characterizes the quality of the wireless channel in the sliding window of the UE is an extreme value. Since the elements in the sliding window are periodically updated one by one, the shorter the window length, the easier it is to be judged as "UE is under extreme channel conditions" (assuming the window length is 1, then as long as there is an extreme characterization wireless The information value of the channel quality, the UE will be judged as "under extreme channel conditions"), on the contrary, the longer the window length, the more difficult it is to be judged as "the UE under extreme channel conditions" (assuming the window length is 100, Then the 100 pieces of information that characterize the quality of the wireless channel in the required window are all extreme values before the UE will be judged as "under extreme channel conditions”).
  • shortening the window length can make it easier for the UE to be judged as “under extreme channel conditions", and ultimately increase the frequency of triggering "adjusting CSI-RS power”.
  • the sliding window length adaptive adjustment algorithm can reasonably adjust the window length of each UE, and ultimately makes the frequency of triggering "adjusting CSI-RS power" not too high or too low.
  • the adjustment module 701 is configured to use the following method to determine that the length of the sliding window does not need to be adjusted according to all the information characterizing the wireless channel quality in the sliding window: when the sliding window indicates The ratio of the number of information that characterizes the wireless channel quality to the length of the sliding window is greater than or equal to the third preset threshold, or the sliding window indicates that the user is at channel quality When the ratio of the number of extremely bad information characterizing the wireless channel quality to the length of the sliding window is greater than or equal to the fourth preset threshold, it is determined that the length of the sliding window does not need to be adjusted.
  • the adjustment module 701 is further configured to: set initial parameters.
  • the initial parameters include: the length of the sliding window, the threshold (ie, the first preset threshold) that is determined to be the information indicating the quality of the wireless channel as having excellent channel quality, and the wireless channel quality that is determined as the extremely bad channel quality.
  • the threshold of the information i.e., the second preset threshold
  • the ratio of the number of users in the cell with excellent channel quality to the total number of users in the cell i.e. the first preset ratio
  • the threshold of the ratio of the number of users to the total number of users in the cell ie, the second preset ratio
  • the default value of the transmission power of the reference signal the power down offset, and the power up offset.
  • the embodiments of this application determine the need to adjust the transmission of the reference signal based on the ratio of the number of users with extremely good channel quality 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.
  • Power adjust the transmit power of the reference signal, and determine the signal-to-noise ratio SINR of the downlink channel based on the CQI measured by the reference signal after adjusting the transmit power and the transmit power adjustment amount of the reference signal.
  • the channel quality is extremely bad, the error caused by the limited measurement capability of the user equipment or the limited feedback information is reduced, and the accuracy of the SINR is improved.
  • Another embodiment of the present application provides an apparatus for acquiring channel state information, including 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 , To implement any of the above methods for acquiring channel state information.
  • Another embodiment of the present application provides a computer-readable storage medium with a computer program stored on the computer-readable storage medium, and when the computer program is executed by a processor, any one of the aforementioned methods for acquiring channel state information is implemented.
  • the disclosed method and device can be implemented in other ways.
  • the device embodiments described above are merely illustrative.
  • the division of the modules is only a logical function division, and there may be other divisions in actual implementation, such as: multiple modules or components can be combined, or It can be integrated into another system, or some features can be ignored or not implemented.
  • the communication connection between the multiple components shown or discussed may be indirect coupling or communication connection through some interfaces, devices or modules, and may be electrical, mechanical, or other forms.
  • modules described above as separate components may or may not be physically separate, and the components displayed as modules may or may not be physical modules, that is, they may be located in one place or distributed on multiple network modules; Some or all of the modules may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.
  • the multiple functional modules in the embodiments of the present application may all be integrated into one processing module, or multiple modules may be individually used as one module, or two or more modules may be integrated into one module;
  • the integrated module can be implemented in the form of hardware, or in the form of hardware plus software functional modules.
  • All or part of the steps of the above method embodiments can be implemented by a program instructing relevant hardware, the aforementioned program can be stored in a computer readable storage medium, and when the program is executed, the steps including the above method embodiment are executed; and
  • the aforementioned storage medium includes: a mobile storage device, a read-only memory (Read-Only Memory, ROM), a magnetic disk or an optical disc, and other media that can store program codes.
  • Such software may be distributed on a computer-readable medium, and the computer-readable medium may include a computer storage medium (or non-transitory medium) and a communication medium (or transitory medium).
  • the term computer storage medium includes volatile and non-volatile memory implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Flexible, removable and non-removable media.
  • Computer storage media include, but are not limited to, Random Access Memory (RAM), ROM, Electrically Erasable Programmable Read-Only Memory (EEPROM), flash memory or other memory technologies, compact discs Read-only memory (Compact Disc Read-Only Memory, CD-ROM), digital versatile disk (Digital Video Disc, DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or can be used for Any other medium that stores desired information and can be accessed by a computer.
  • communication media usually contain computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as carrier waves or other transmission mechanisms, and may include any information delivery media .

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Les modes de réalisation de la présente invention concernent un procédé et un appareil d'acquisition d'informations d'état de canal. Le procédé consiste à : lorsqu'il est déterminé, en fonction de la proportion du nombre d'utilisateurs ayant une qualité de canal extrêmement bonne dans une cellule au nombre total d'utilisateurs dans la cellule, et de la proportion du nombre d'utilisateurs ayant une qualité de canal extrêmement mauvaise dans la cellule au nombre total d'utilisateurs dans la cellule, qu'une puissance de transmission pour un signal de référence doit être ajustée, ajuster la puissance de transmission pour le signal de référence et envoyer le signal de référence à la puissance de transmission ajustée ; recevoir un indicateur de qualité de canal radio (CQI) mesuré au moyen du signal de référence pour lequel la puissance de transmission a été ajustée, et déterminer un rapport signal sur brouillage plus bruit (SINR) d'un canal descendant en fonction du CQI et de la quantité d'ajustement de puissance de transmission du signal de référence.
PCT/CN2020/071773 2019-03-18 2020-01-13 Procédé et appareil d'acquisition d'informations d'état de canal WO2020186916A1 (fr)

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