WO2012167442A1 - 修正信道质量指示值的方法和设备 - Google Patents
修正信道质量指示值的方法和设备 Download PDFInfo
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- WO2012167442A1 WO2012167442A1 PCT/CN2011/075583 CN2011075583W WO2012167442A1 WO 2012167442 A1 WO2012167442 A1 WO 2012167442A1 CN 2011075583 W CN2011075583 W CN 2011075583W WO 2012167442 A1 WO2012167442 A1 WO 2012167442A1
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- 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
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- 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
- H04L1/0028—Formatting
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
Definitions
- the present invention relates to the field of wireless communication technologies, and in particular, to a technique for correcting a channel quality indicator value.
- HSDPA High Speed Downlink Packet Access
- the user terminal measures the received radio channel quality, and each channel quality level corresponds to a channel quality indicator (CQI) value, and the CQI value is fed back to the base station.
- CQI channel quality indicator
- the base station After receiving the CQI, the base station combines the available power resources and code resources with the amount of data in the transmission buffer, and transmits the appropriate size data block with appropriate transmission power, number of code channels, and modulation. This is the adaptive modulation and coding technique in the HSDPA system.
- the inventors of the present invention have found that the accuracy of CQI feedback can have a serious impact on the data transmission rate of HSDPA.
- the accuracy of the CQI measurement is related to the implementation algorithm of the user terminal, and the network side cannot control it.
- Embodiments of the present invention provide a method and apparatus for correcting a CQI value so as to avoid the influence of an error of a CQI measurement value.
- a method for correcting a channel quality indicator value which mainly includes: Obtaining information characterizing the characteristics of the wireless channel;
- a CQI correction device which mainly includes:
- a wireless channel feature acquiring unit configured to acquire information that characterizes a wireless channel
- a target value determining unit configured to determine a BLER target value according to the information that characterizes the wireless channel feature acquired by the wireless channel feature acquiring unit
- a correction unit configured to correct the channel quality indicator CQI measurement value according to the BLER target value determined by the target value determining unit and the BLER measurement value.
- the CQI correction device may be a user terminal or a network side device.
- the method and device provided by the embodiments of the present invention determine a BLER target value according to information indicating characteristics of a wireless channel, and then perform CQI correction according to the BLER target value, and can accurately feed back CQI values according to different channel conditions, thereby It can avoid the influence of the error of CQI measurement value and increase the transmission rate and air interface capacity.
- FIG. 1 is a flowchart of a method for correcting a CQI value according to an embodiment of the present invention
- FIG. 2 is a flowchart of a method for modifying a CQI value according to another embodiment of the present invention.
- FIG. 3 is a flowchart of a method for correcting a CQI value according to another embodiment of the present invention.
- FIG. 4 is a schematic structural diagram of a CQI correction device according to an embodiment of the present invention.
- the base station is a NodeB, and the base station control device is a Radio Network Controller (RNC); in the LTE system, the base station is an evolved base station (eNodeB), and the base station control device is a serving gateway ( servicing Gateway (SGW) and Mobile Management Entity (MME).
- RNC Radio Network Controller
- the base station is an evolved base station (eNodeB)
- the base station control device is a serving gateway ( servicing Gateway (SGW) and Mobile Management Entity (MME).
- SGW Serving Gateway
- MME Mobile Management Entity
- An embodiment of the present invention provides a method for correcting a CQI value. As shown in FIG. 1, the method may include the following content.
- the characteristics of the wireless channel can be characterized by various information as long as the information can reflect the characteristics of the wireless channel.
- the characteristics of the wireless channel can be characterized by any one or more of the following information: CQI mean, CQI difference value, fluctuation value of CQI measurement value with respect to CQI mean value, Transmit Power Control (TPC) command statistics Multipath information, when it is a CQI mean value, a CQI difference value, a CQI measurement value with respect to a CQI mean value fluctuation value, a TPC command statistics information, and a plurality of multipath information to characterize a wireless channel feature, that is, through multiple A combination of information to reflect wireless channel characteristics.
- the above information indicating the characteristics of the wireless channel may be acquired by the terminal device or may be obtained by the network side device.
- the CQI differential value ACQI can be obtained as follows:
- ACQI abs ( CQI ( t ) -CQI ( tn ) ), where abs represents the absolute value, CQI ( t ) represents the CQI measurement at the current time, and CQI ( tn ) represents the n unit time before the current time (for example, The unit time may be a CQI value of the transmission time interval TTI, where n is a natural number; or, if there are multiple CQI measurement values in the first preset time period, multiple CQI difference values may be acquired, and the multiple The CQI difference value is smoothed or averaged, and the result is obtained. It is the CQI difference value in the first preset time period.
- the first preset time period is 6 ⁇
- ⁇ is 3
- each ⁇ corresponds to a CQI value
- the fluctuation value of the CQI measurement value relative to the mean value of the CQI can be obtained as follows:
- the fluctuation value of the CQI measurement value with respect to the mean value can be expressed in various ways, which can reflect the CQI measurement value and the CQI mean value actually obtained.
- the difference may be expressed, for example, by the standard deviation of the CQI value in the second preset time period, or may be represented by the CQI corpse abs (CQI ( t ) - CQI mean ) for the second preset time period.
- CQI f represents the fluctuation value of the CQI measurement value with respect to the mean value
- abs represents the absolute value
- CQI ( t ) represents the CQI measurement value at time t
- CQI mean represents the CQI mean value
- the CQI mean can be obtained as follows:
- the CQI mean value is an average value of the CQI value in a preset time period, and the preset time period is, for example, a third preset time period, and the CQI average value in the third preset time period may be obtained in multiple manners, for example, the third pre- Setting a plurality of CQI values in the time period to be averaged as the third preset time period
- CQI mean axCQI ( t ) + ( 1-a ) CQI ( tm ), a can be any value between 0 and 1, CQI mean for CQI mean, CQI ( t ) for CQI at current time, CQI ( tm ) for The CQI value of m unit time before the current time
- the TPC command statistics can be statistical information such as the mean, variance, or standard deviation obtained according to the TPC command. You can obtain the TPC command statistics in the following ways:
- the multipath information may include, but is not limited to, delay spread, Doppler spread, multipath number, etc., and the multipath information may be obtained by acquiring multipath number, multipath delay, multipath strength, and Doppler frequency extension. One or more, not here - for example.
- the multipath information of the uplink signal can be obtained from the received uplink signal, and the uplink multipath information and the downlink multipath information can be considered to be similar, so that the multipath of the downlink signal can also be obtained.
- Information For the user terminal device, multipath information can be obtained based on the multipath search result. It should be noted that the multipath information herein may also be information obtained by counting multipath information in a period of time.
- the network side device may perform statistics according to the CQI reported by the user terminal. get.
- the information characterizing the channel acquired in S100 can be directly or indirectly determined.
- the BLER target value may be determined in advance.
- the BLER target value may be determined by searching the correspondence, and the correspondence may be in the form of a table, for example, by matching the correspondence between the information indicating the characteristics of the wireless channel and the BLER target value. It can be understood that the correspondence may be determined according to empirical values or obtained by simulation.
- the method for determining the BLER target value in this step may be used to determine the initial BLER target value, and may also be used to determine the total BLER target value, that is, the method in this embodiment may be applied to different methods.
- the initial BLER may be the block error rate of the first transmission of the data block
- the total BLER may be the proportion of the number of negative acknowledgement information (Natively Acknowledgement) in the total time of the data transmission, for the initial BLER
- the meaning of the total BLER and the total BLER are determined by those skilled in the art and will not be described too much here.
- S104 Correct the CQI measurement value according to the BLER measurement value and the determined BLER target value.
- NACK Counting Negative Acknowledgement
- Acknowledgement, etc.) ACK Acknowledgement
- the specific values of the first preset time period, the second preset time period, the third preset time period, and the fourth preset time period in this embodiment may be set according to actual needs, and the embodiment does not limit this. .
- the method for correcting CQI in this embodiment may be implemented by a network side (for example, a base station device) or by a user terminal device. If the user terminal device implements CQI correction, the user terminal device will be corrected. The subsequent CQI is reported to the network side device.
- the CQI method in the embodiment may be implemented by the user terminal and the network side. For example, the S100 may be notified by the user terminal device after the user terminal device completes, and the network side device completes the S102-S104. It is understood that any one of the S100-S104 steps may be completed by the network side device or by the user terminal device.
- the method for correcting CQI determines a BLER target value according to information indicating characteristics of a wireless channel, and then performs CQI correction according to the BLER target value, and can accurately feed back CQI values according to different channel conditions, thereby It can avoid the influence of the error of CQI measurement value and increase the transmission rate and air interface capacity.
- the BLER target value may be determined indirectly using the acquired information characterizing the channel characteristics, for example, may be:
- a wireless channel type by mapping a correspondence between the information of the wireless channel feature and the wireless channel type according to the information characterizing the wireless channel; determining the BLER target value by the correspondence between the wireless channel type and the BLER target value according to the wireless channel type;
- the acquired information indicating the characteristics of the wireless channel includes first part information and second part information, and according to the first part information, determining a wireless channel type by a correspondence between the first part information and a wireless channel type; according to the second part information and the wireless channel type And determining a BLER target value by using the second partial information and the correspondence between the wireless channel type and the BLER target value.
- At least one type of wireless channel may be divided according to information that characterizes the characteristics of the wireless channel, and then between the information characterizing the wireless channel and the type of the wireless channel. There is a correspondence. Then, the obtained information representing the characteristics of the wireless channel is mapped to the wireless channel type, that is, according to the acquired information characterizing the characteristics of the wireless channel, and the wireless channel type can be obtained by looking up the correspondence.
- the type of the radio channel can be, for example, type A, type B, etc., and the specific type is not limited in this embodiment.
- the wireless channel type and the BLER target value may also have a certain correspondence. Then, by obtaining the wireless channel type, the BLER target value can be determined by looking up the correspondence. It can be understood that the wireless channel type and the BLER target value are The correspondence may be preset based on empirical values or simulation results. The correspondence between the wireless channel type and the BLER target value can be, for example, as shown in Table 1.
- each step of completing the CQI value correction is performed by the user terminal as an example, assuming that the first part information is a fluctuation value of the CQI difference value and the CQI measurement value with respect to the mean value, and the second part information is a CQI average value, and another implementation of the present invention
- the example also provides a method of correcting the CQI value. As shown in FIG. 2, the method may include the following.
- S200 The user terminal acquires a CQI average value.
- the user terminal acquires a fluctuation value of the CQI difference value and the CQI measurement value with respect to the mean value.
- the user terminal can obtain the actual value of the CQI by measurement, and can obtain the fluctuation value of the CQI difference value and the CQI measurement value with respect to the mean value according to the obtained CQI actual value.
- the acquired CQI difference value is represented by ACQI.
- the manner of obtaining the fluctuation value of the CQI measurement value with respect to the mean value can also refer to the description of the previous embodiment.
- abs (CQI (t) - CQI mean ) represents the fluctuation value of the CQI value with respect to the mean value, and is assumed to be in the second.
- the user terminal determines the wireless channel type according to the fluctuation value of the CQI difference value and the CQI measurement value with respect to the mean value.
- the wireless channel type herein may be at least one channel type corresponding to information characterizing the characteristics of the wireless channel (for example, a CQI difference value and a fluctuation value of the CQI measurement value with respect to the mean value) configured in advance according to an empirical value or other requirements, and H has no type.
- the channel type determined by the CQI difference value and the CQI measurement value with respect to the fluctuation value of the mean value is A.
- the user terminal determines the BLER target value according to the CQI mean value and the determined channel type.
- the correspondence between the CQI mean value, the wireless channel type, and the BLER target value may be pre-stored, and the correspondence may be, for example, a two-dimensional table, as shown in Table 2: Table 2
- the range of the CQI mean value and the wireless channel type can determine the corresponding block error rate target value.
- the block error rate target value 11 and the BLER target value 12 are expressed differently.
- the BLER target value is taken, and the number after the BLER target value is a label, not a specific value. It can be understood that, according to the CQI mean value obtained in S200, it can be determined which range the average value belongs to, so that the BLER target value can be determined by using Table 2.
- the user equipment corrects the CQI measurement value according to the determined BLER target value and the BLER measurement value.
- the process may continue to be performed.
- S210 The user terminal reports the corrected CQI value to the network side device.
- the corrected CQI value can be reported to the network side device, so that the network side device can obtain relatively accurate CQI information, which is used as the basis for subsequent data transmission control.
- the wireless channel feature is used to describe the wireless channel feature as an example, and there are other ways to characterize the wireless channel feature, for example, for example.
- the wireless channel characteristics are characterized by a combination of TPC command statistics and multipath information (eg, delay spread statistics). For details, see the related description in S100.
- the user terminal determines the BLER target value to perform the CQI value correction according to the CQI mean value and the information indicating the characteristics of the wireless channel, and then reports the corrected CQI value to the network side device, considering different channel conditions, Relatively accurate feedback of CQI values, In order to avoid the influence of the error of the CQI measurement value, the transmission rate and the air interface capacity are improved.
- the modification of the CQI value is performed by a network side device (for example, a base station).
- Another embodiment of the present invention further provides a method for correcting a CQI value.
- the first part information is assumed to be TPC command statistics.
- the second part of the information is the CQI mean value.
- the method may include the following content.
- S300 The network side obtains the CQI average value according to the CQI value reported by the user terminal.
- the network side device may further obtain the CQI average value.
- the CQI average value refers to the related description in S100.
- S302 The network side acquires a standard deviation of the TPC command in the time period T1.
- the TPC command is a command for transmitting power control to control whether the transmit power is increased or decreased by one step or the transmit power is kept unchanged. For example, when the TPC command is 1, the transmit power is increased by one step, and the TPC command is -1 indicates that the transmit power is reduced by one step. When the TPC command word is 0, the transmit power remains unchanged.
- the network side device can obtain the TPC command in T1 by counting the TPC commands for a preset period of time (for example, T1). The standard deviation, so that the standard deviation can be utilized for subsequent processing.
- S300 and S302 are not limited in this embodiment. In addition, S300 and S302 can also be executed simultaneously.
- the network side determines a BLER target value according to a standard deviation of the CQI mean value and the TPC command.
- the BLER target value may be determined by searching a pre-configured correspondence, which may be a CQI mean value and a correspondence between a standard deviation of the TPC command and the BLER, and then may be determined according to the CQI mean value and the standard deviation of the TPC command.
- the BLER target value may be determined by searching a pre-configured correspondence, which may be a CQI mean value and a correspondence between a standard deviation of the TPC command and the BLER.
- the network side corrects the CQI measurement value according to the determined BLER target value and the BLER measurement value.
- the network side determines the BLER target value according to the CQI mean value and the TPC command statistics information, and then performs CQI correction according to the BLER target value, and can relatively accurately feedback the CQI value according to different channel conditions, thereby It can avoid the influence of the error of CQI measurement value and increase the transmission rate and air interface capacity.
- An embodiment of the present invention further provides a CQI value correction device.
- the CQI value correction device may include:
- the wireless channel feature acquiring unit 401 is configured to acquire information that characterizes the wireless channel.
- the characteristics of the wireless channel may be characterized by various information.
- the characteristics of the wireless channel may be characterized by any one or more of the following information: CQI mean, CQI difference value, CQI measurement value relative to CQI Mean fluctuation value, TPC command statistics, multipath information, when the CQI difference value, the CQI measurement value relative to the CQI mean value fluctuation value, the TPC command statistics information, and the multipath information to characterize the wireless channel feature, That is to say, the wireless channel characteristics are reflected by a combination of a plurality of information.
- the related description in S100 For a specific manner of obtaining information characterizing the characteristics of the wireless channel, reference may be made to the related description in S100.
- the target value determining unit 402 is configured to determine a BLER target value according to the information characterizing the wireless channel acquired by the wireless channel feature acquiring unit 401.
- the correcting unit 403 is configured to correct the CQI measurement value according to the BLER target value determined by the target value determining unit 402 and the BLER measurement value.
- the correcting unit 403 may correct the CQI measurement value by: if the BLER measurement value is greater than the determined BLER target value, the downward adjustment may be performed on the basis of the CQI measurement value, and the reduced CQI value is used as the correction. After the CLER value is less than the determined BLER target value, it can be adjusted upward based on the CQI measurement value, and the increased CQI value is used as the corrected CQI value.
- the BLER measurement value herein may refer to the average value obtained from the measured actual BLER value. Then the correction unit 403 can include:
- Decreasing a subunit configured to: if the BLER measurement value is greater than the BLER target value, reduce the CQI measurement value, and use the reduced CQI measurement value as the corrected CQI value; or The subunit is increased for increasing the CQI measurement value if the BLER measurement value is smaller than the BLER target value, and using the increased CQI measurement value as the corrected CQI value.
- the CQI value correction device may be a user terminal, or may be a network side device, such as a base station or an evolved base station, etc., it may be understood that some modules of the CQI correction device may be included in the user terminal. The other part of the module is included in the network side device, and the correction of the CQI value is completed by the interaction between the user terminal and the network side device, which is not limited in this embodiment.
- the target value determining unit 402 may determine the BLER target value in a plurality of manners, where the target value determining unit may include: a first determining subunit, configured to represent the wireless channel feature by searching according to the acquired information characterizing the wireless channel characteristic The information corresponding to the BLER target value determines the BLER target value; or the target value determining unit 402 may include: a second determining subunit, configured to use the information characterizing the wireless channel feature according to the information characterizing the wireless channel feature Corresponding relationship between wireless channel types determines a wireless channel type, and determines a BLER target value by a correspondence between a wireless channel type and a BLER target value according to the wireless channel type; or the obtained information indicating the characteristics of the wireless channel includes the first part of information.
- the target value determining unit may include: a third determining subunit, configured to determine, according to the first partial information, a wireless channel type by using a correspondence between the first partial information and a wireless channel type; First The two-part information and the wireless channel type determine the BLER target value by the second partial information and the correspondence between the wireless channel type and the BLER target value.
- the device or system embodiment described above is merely illustrative, wherein the separate components may or may not be physical units, ie may be located in one place, or may be distributed over multiple network elements. Some or all of the units can be selected according to actual needs. The purpose of the solution of the embodiment is achieved. Those of ordinary skill in the art can understand and implement without any creative effort.
- the medium can be a read only memory, a magnetic disk or a compact disk or the like.
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Application Number | Priority Date | Filing Date | Title |
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PCT/CN2011/075583 WO2012167442A1 (zh) | 2011-06-10 | 2011-06-10 | 修正信道质量指示值的方法和设备 |
EP11867129.6A EP2712107B1 (en) | 2011-06-10 | 2011-06-10 | Method and device for modifying channel quality indicator value |
CN201180001355.7A CN102265543B (zh) | 2011-06-10 | 2011-06-10 | 修正信道质量指示值的方法和设备 |
KR1020137034142A KR101607179B1 (ko) | 2011-06-10 | 2011-06-10 | 채널 품질 표시를 정정하는 방법 및 장치 |
US14/102,001 US9240859B2 (en) | 2011-06-10 | 2013-12-10 | Method and device for correcting channel quality indicator value |
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US14/102,001 Continuation US9240859B2 (en) | 2011-06-10 | 2013-12-10 | Method and device for correcting channel quality indicator value |
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EP (1) | EP2712107B1 (zh) |
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EP2712107B1 (en) | 2018-11-28 |
KR101607179B1 (ko) | 2016-03-29 |
CN102265543A (zh) | 2011-11-30 |
EP2712107A4 (en) | 2014-04-09 |
CN102265543B (zh) | 2014-03-12 |
EP2712107A1 (en) | 2014-03-26 |
US9240859B2 (en) | 2016-01-19 |
US20140098697A1 (en) | 2014-04-10 |
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