CN108242974B - Method and device for dynamically adjusting CQI based on error rate and mobile terminal - Google Patents
Method and device for dynamically adjusting CQI based on error rate and mobile terminal Download PDFInfo
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- CN108242974B CN108242974B CN201611218525.8A CN201611218525A CN108242974B CN 108242974 B CN108242974 B CN 108242974B CN 201611218525 A CN201611218525 A CN 201611218525A CN 108242974 B CN108242974 B CN 108242974B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- 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
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- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
- H04L1/203—Details of error rate determination, e.g. BER, FER or WER
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Abstract
The invention provides a method and a device for dynamically adjusting CQI based on a bit error rate and a mobile terminal. The method comprises the following steps: calculating the error rate of a first number of subframes when the first number of subframes are received; determining a bit mutual information normalization adjustment step length corresponding to the bit error rate of the first number of subframes according to a mapping table of the bit error rate adjustment threshold and the bit mutual information normalization adjustment step length; if the bit mutual information normalization adjustment step length corresponding to the error rate of the subframes with the first number is smaller than zero, calculating CQI according to the bit mutual information after the first adjustment; and if the bit mutual information normalization adjustment step length corresponding to the error rate of the subframes with the first number is larger than or equal to zero, calculating the CQI according to second adjusted bit mutual information, wherein the second adjusted bit mutual information is determined based on the error rate of the subframes with the second number. The invention can effectively improve the accuracy of channel quality feedback, so that the resource scheduling obtained by the terminal is more reasonable and closer to the comprehensive level of the actual channel and the terminal decoding capability, thereby improving the frequency utilization rate.
Description
Technical Field
The present invention relates to the field of mobile communications technologies, and in particular, to a method and an apparatus for dynamically adjusting CQI based on bit error rate, and a mobile terminal.
Background
Adaptive Modulation Coding (AMC) refers to dynamically selecting an appropriate Modulation and Coding Scheme (MCS) according to the change of channel conditions, and applying the AMC to an LTE system can obtain a higher system throughput on the premise of ensuring the system error rate, thereby improving the spectrum utilization rate of the system. That is, with the change of the signal quality of the receiving end, the transmitter can adjust the modulation and coding modes to match the channel capacity to the maximum extent, and avoid unreasonable allocation and even waste of the spectrum resources.
In downlink transmission of a terminal, in order to assist a base station to select a suitable modulation and coding scheme, the terminal needs to report a Channel Quality Indicator (CQI). Firstly, the terminal calculates a Signal-to-Noise Ratio (SNR) according to the channel estimation of the downlink reference Signal; then, bit mutual Information (BitMI) is calculated according to the SNR; then, calculating the error rate under each modulation and coding mode MCS according to the bit mutual information; and finally, selecting the CQI corresponding to the highest available MCS with the error rate not more than 10% and reporting the CQI to the base station.
In the process of implementing the invention, the inventor finds that at least the following technical problems exist in the prior art:
in the prior art, the CQI reported by the terminal to the base station is calculated according to the channel estimation of the downlink reference signal, so the calculated CQI is only one estimation and simulation, and cannot completely reflect the demodulation capability of the terminal. The improper CQI may cause unreasonable resources allocated by the base station, for example, if the CQI reported by the terminal is lower than the actual demodulation capability of the terminal, the network may schedule the MCS of the terminal with the reported CQI as a reference, so that the terminal cannot realize the maximum resource scheduling according to the demodulation capability, thereby causing a reduction in transmission rate; if the CQI reported by the terminal is higher than the actual demodulation capability of the terminal, there will be a lot of packets and retransmissions in the physical layer, which also results in a reduction of the transmission rate.
Disclosure of Invention
The method, the device and the mobile terminal for dynamically adjusting the CQI based on the error rate can effectively improve the accuracy of channel quality feedback, so that the resource scheduling obtained by the terminal is more reasonable and closer to the comprehensive level of the actual channel and the terminal decoding capability, thereby improving the frequency utilization rate.
In a first aspect, the present invention provides a method for dynamically adjusting CQI based on bit error rate, including:
calculating the error rate of a first number of subframes when the first number of subframes are received;
determining the bit mutual information normalization adjustment step length corresponding to the bit error rate of the first number of subframes according to a mapping table of the bit error rate adjustment threshold and the bit mutual information normalization adjustment step length;
if the bit mutual information normalization adjustment step length corresponding to the bit error rate of the first number of subframes is smaller than zero, adjusting the current bit mutual information according to the bit mutual information normalization adjustment step length corresponding to the bit error rate of the first number of subframes to obtain first adjusted bit mutual information, and calculating a Channel Quality Indication (CQI) reported to a base station according to the first adjusted bit mutual information;
if the bit mutual information normalization adjustment step length corresponding to the bit error rate of the first number of subframes is larger than or equal to zero, continuing to receive the subframes until the bit error rate of the second number of subframes is calculated when the second number of subframes is received, determining the bit mutual information normalization adjustment step length corresponding to the bit error rate of the second number of subframes according to the mapping table of the bit error rate adjustment threshold and the bit mutual information normalization adjustment step length, adjusting the current bit mutual information according to the bit mutual information normalization adjustment step length corresponding to the bit error rate of the second number subframes to obtain second adjusted bit mutual information, and calculating the channel quality indication CQI reported to the base station according to the second adjusted bit mutual information.
Optionally, the calculating the bit error rate of the first number of subframes comprises:
and taking the ratio of the number of the error cyclic redundancy check codes in the first number of subframes to the first number as the error rate of the first number of subframes.
Optionally, the mapping table of the bit error rate adjustment threshold and the bit mutual information normalization adjustment step size is determined according to an actual network situation where the terminal is located.
Optionally, the second number is twice the first number.
In a second aspect, the present invention provides an apparatus for dynamically adjusting CQI based on bit error rate, including:
the calculating module is used for calculating the error rate of the first number of subframes when the first number of subframes are received;
a determining module, configured to determine, according to a mapping table of a bit error rate adjustment threshold and a bit mutual information normalization adjustment step size, a bit mutual information normalization adjustment step size corresponding to the bit error rate of the first number of subframes;
a first processing module, configured to, if the bit mutual information normalization adjustment step size corresponding to the bit error rate of the first number of subframes is smaller than zero, adjust the current bit mutual information according to the bit mutual information normalization adjustment step size corresponding to the bit error rate of the first number of subframes to obtain first adjusted bit mutual information, and calculate, according to the first adjusted bit mutual information, a channel quality indication CQI reported to the base station;
and the second processing module is used for continuously receiving the subframes until a second number of subframes are received if the bit mutual information normalization adjustment step length corresponding to the bit error rate of the first number of subframes is larger than or equal to zero, determining the bit mutual information normalization adjustment step length corresponding to the bit error rate of the second number of subframes according to the preset mapping table of the bit error rate adjustment threshold and the bit mutual information normalization adjustment step length, adjusting the current bit mutual information according to the bit mutual information normalization adjustment step length corresponding to the bit error rate of the second number of subframes to obtain second adjusted bit mutual information, and calculating the channel quality indication CQI reported to the base station according to the second adjusted bit mutual information.
Optionally, the calculating module is configured to use a ratio of the number of crc codes in the first number of subframes to the first number as the error rate of the first number of subframes.
Optionally, the mapping table of the bit error rate adjustment threshold and the bit mutual information normalization adjustment step size is determined according to an actual network situation where the terminal is located.
Optionally, the second number is twice the first number.
In a third aspect, the present invention provides a mobile terminal, where the mobile terminal includes any one of the above apparatus for dynamically adjusting CQI based on bit error rate.
The method, the device and the mobile terminal for dynamically adjusting the CQI based on the error rate dynamically adjust the channel quality indication CQI based on the statistics of the downlink receiving error rate, and particularly adaptively adjust the bit mutual information in the CQI calculation process according to the downlink decoding condition so as to achieve the reasonable level of dynamically controlling the downlink receiving error rate to the theory.
Drawings
FIG. 1 is a flow chart of a method for dynamically adjusting CQI based on bit error rate according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating the method for dynamically adjusting CQI based on the bit error rate according to the present invention in detail, taking the first number of subframes as 128 subframes as an example;
FIG. 3 is a detailed demonstration of the process of adjusting CQI according to the present invention;
fig. 4 is a schematic structural diagram of an apparatus for dynamically adjusting CQI based on bit error rate according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a method for dynamically adjusting CQI based on bit error rate, as shown in FIG. 1, the method comprises:
s11, calculating the error rate of the first number of subframes when the first number of subframes are received.
S12, determining the bit mutual information normalization adjustment step length corresponding to the error rate of the first number of subframes according to the mapping table of the error rate adjustment threshold and the bit mutual information normalization adjustment step length.
The mapping table of the error rate adjustment threshold and the bit mutual information normalization adjustment step length is determined according to the actual network condition of the terminal.
S13, if the bit mutual information normalization adjustment step length corresponding to the error rate of the first number of subframes is smaller than zero, adjusting the current bit mutual information according to the bit mutual information normalization adjustment step length corresponding to the error rate of the first number of subframes to obtain first adjusted bit mutual information, and calculating the channel quality indication CQI reported to the base station according to the first adjusted bit mutual information.
S14, if the bit mutual information normalization adjustment step length corresponding to the error rate of the first number of subframes is larger than or equal to zero, continuing to receive the subframes until the error rate of the second number of subframes is calculated when a second number of subframes is received, determining the bit mutual information normalization adjustment step length corresponding to the error rate of the second number of subframes according to the mapping table of the error rate adjustment threshold and the bit mutual information normalization adjustment step length, adjusting the current bit mutual information according to the bit mutual information normalization adjustment step length corresponding to the error rate of the second number of subframes to obtain second adjusted bit mutual information, and calculating and reporting the channel quality indication CQI to the base station according to the second adjusted bit mutual information.
Wherein the second number is twice the first number.
Compared with the prior art, the technical scheme of the invention can effectively improve the accuracy of channel quality feedback, so that the resource scheduling obtained by the terminal is more reasonable and closer to the comprehensive level of the actual channel and the terminal decoding capability, thereby improving the frequency utilization rate.
Optionally, the calculating the bit error rate of the first number of subframes comprises:
and taking the ratio of the number of the error cyclic redundancy check codes in the first number of subframes to the first number as the error rate of the first number of subframes.
In addition, the error rate of the second number of subframes is calculated by adopting a similar method.
To describe the method for dynamically adjusting CQI based on bit error rate in more detail, the first number of subframes is 128 subframes, as shown in fig. 2:
1) when 128 sub-frames are received, accumulating the number of error CRC in the 128 sub-frames, and calculating the receiving error rate Bler of the 128 sub-frames: error CRC number/128.
2) And determining a BitMI normalization adjustment step length corresponding to the receiving error rate of the 128 subframes according to a mapping table. Wherein the mapping table is shown in table 1 below.
TABLE 1
| Bler adjustment threshold | BitMI normalization adjustment step length |
| [0,5％) | 5 |
| [5％，12％) | 0 |
| [12％，30％) | -20 |
| [30％，50％) | -40 |
| [50％，100％] | -100 |
3) If the BitMI normalization adjustment step length corresponding to the receiving error rate of the 128 sub-frames is smaller than zero, the fact that the receiving error probability is high requires the reduction of CQI is shown, and a base station is informed to reduce MCS so as to reduce Bler to a reasonable level. At this time, the current bit mutual information is adjusted according to the bit mutual information normalization adjustment step length corresponding to the error rate of the 128 sub-frame to obtain the adjusted bit mutual information, and the CQI is calculated according to the adjusted bit mutual information.
4) If the BitMI normalization adjustment step length corresponding to the receiving error rate of the 128 sub-frames is larger than or equal to zero, it indicates that the receiving error probability is low and the CQI needs to be improved to obtain a higher MCS. At this time, continuing to receive the sub-frames until 256 sub-frames are received, accumulating the number of error CRCs in the 256 sub-frames, and calculating the reception error rate Bler of the 256 sub-frames: error CRC number/256; and determining a bit mutual information normalization adjustment step length corresponding to the error rate of 256 subframes according to a mapping table, adjusting the current bit mutual information according to the bit mutual information normalization adjustment step length corresponding to the error rate of 256 subframes to obtain adjusted bit mutual information, and calculating CQI according to the adjusted bit mutual information.
As shown in fig. 3, for a detailed demonstration of the CQI adjusting process, it can be known from the figure that:
the first stage is as follows: when 128 subframes are received, the error rate of the 128 subframes is 40%, the BitMI adjustment step length obtained by looking up a table 1 is-40, the CQI is reduced and fed back to the base station to reduce the MCS;
and a second stage: when 128 sub-frames are received again, the error rate of the 128 sub-frames received again is reduced to 15%, and the BitMI adjustment step length obtained by looking up a table 1 is-20;
and a third stage: due to the further adjustment of BitMI, CQI can be further reduced and fed back to the base station, the MCS provided by the base station is reduced, and the error rate is reduced to 0;
a fourth stage: when Bler is 0, continuously receiving the subframes till 256 subframes are accumulated, and looking up a table 1 to obtain a BitMI adjustment step length of 5;
finally, Bler stabilized at 8% and BitMI was not readjusted.
An embodiment of the present invention further provides a device for dynamically adjusting CQI based on bit error rate, as shown in fig. 4, the device includes:
a calculating module 31, configured to calculate a bit error rate of a first number of subframes when the first number of subframes are received;
a determining module 32, configured to determine, according to a mapping table of a bit error rate adjustment threshold and a bit mutual information normalization adjustment step size, a bit mutual information normalization adjustment step size corresponding to the bit error rate of the first number of subframes;
a first processing module 33, configured to, if the bit mutual information normalization adjustment step size corresponding to the bit error rate of the first number of subframes is smaller than zero, adjust the current bit mutual information according to the bit mutual information normalization adjustment step size corresponding to the bit error rate of the first number of subframes to obtain first adjusted bit mutual information, and calculate, according to the first adjusted bit mutual information, a channel quality indication CQI reported to the base station;
a second processing module 34, configured to, if the bit mutual information normalization adjustment step size corresponding to the bit error rate of the first number of subframes is greater than or equal to zero, continue to receive subframes until a second number of subframes are received, calculate the bit error rate of the second number of subframes, determine the bit mutual information normalization adjustment step size corresponding to the bit error rate of the second number of subframes according to the preset mapping table of the bit error rate adjustment threshold and the bit mutual information normalization adjustment step size, adjust the current bit mutual information according to the bit mutual information normalization adjustment step size corresponding to the bit error rate of the second number of subframes to obtain second adjusted bit mutual information, and report channel quality indication CQI to the base station according to second adjusted bit mutual calculation information.
The device for dynamically adjusting the CQI based on the error rate dynamically adjusts the channel quality indicator CQI based on the statistics of the downlink receiving error rate, and particularly adaptively adjusts the mutual bit information in the CQI calculation process according to the downlink decoding condition so as to achieve the reasonable level of dynamically controlling the downlink receiving error rate to the theory.
Optionally, the calculating module 31 is configured to use a ratio of the number of error cyclic redundancy check codes in the first number of subframes to the first number as the error rate of the first number of subframes.
Optionally, the mapping table of the bit error rate adjustment threshold and the bit mutual information normalization adjustment step size is determined according to an actual network situation where the terminal is located.
Optionally, the second number is twice the first number.
The embodiment of the invention also provides a mobile terminal which comprises the device for dynamically adjusting the CQI based on the error rate.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A method for dynamically adjusting CQI based on bit error rate is characterized by comprising the following steps:
calculating the error rate of a first number of subframes when the first number of subframes are received;
determining the bit mutual information normalization adjustment step length corresponding to the bit error rate of the first number of subframes according to a mapping table of the bit error rate adjustment threshold and the bit mutual information normalization adjustment step length;
if the bit mutual information normalization adjustment step length corresponding to the bit error rate of the first number of subframes is smaller than zero, adjusting the current bit mutual information according to the bit mutual information normalization adjustment step length corresponding to the bit error rate of the first number of subframes to obtain first adjusted bit mutual information, and calculating a Channel Quality Indication (CQI) reported to a base station according to the first adjusted bit mutual information;
if the bit mutual information normalization adjustment step length corresponding to the bit error rate of the first number of subframes is larger than or equal to zero, continuing to receive the subframes until the bit error rate of the second number of subframes is calculated when the second number of subframes is received, determining the bit mutual information normalization adjustment step length corresponding to the bit error rate of the second number of subframes according to the mapping table of the bit error rate adjustment threshold and the bit mutual information normalization adjustment step length, adjusting the current bit mutual information according to the bit mutual information normalization adjustment step length corresponding to the bit error rate of the second number subframes to obtain second adjusted bit mutual information, and calculating the channel quality indication CQI reported to the base station according to the second adjusted bit mutual information.
2. The method of claim 1, wherein calculating the bit error rate for the first number of subframes comprises:
and taking the ratio of the number of the error cyclic redundancy check codes in the first number of subframes to the first number as the error rate of the first number of subframes.
3. The method of claim 1, wherein the mapping table of the ber adjustment threshold and the mutual bit information normalization adjustment step size is determined according to an actual network situation where the terminal is located.
4. The method of claim 1, wherein the second number is twice the first number.
5. An apparatus for dynamically adjusting CQI based on bit error rate, comprising:
the calculating module is used for calculating the error rate of the first number of subframes when the first number of subframes are received;
a determining module, configured to determine, according to a mapping table of a bit error rate adjustment threshold and a bit mutual information normalization adjustment step size, a bit mutual information normalization adjustment step size corresponding to the bit error rate of the first number of subframes;
a first processing module, configured to, if the bit mutual information normalization adjustment step size corresponding to the bit error rate of the first number of subframes is smaller than zero, adjust the current bit mutual information according to the bit mutual information normalization adjustment step size corresponding to the bit error rate of the first number of subframes to obtain first adjusted bit mutual information, and calculate, according to the first adjusted bit mutual information, a channel quality indication CQI reported to the base station;
and the second processing module is used for continuously receiving the subframes until a second number of subframes are received if the bit mutual information normalization adjustment step length corresponding to the bit error rate of the first number of subframes is larger than or equal to zero, determining the bit mutual information normalization adjustment step length corresponding to the bit error rate of the second number of subframes according to the mapping table of the bit error rate adjustment threshold and the bit mutual information normalization adjustment step length, adjusting the current bit mutual information according to the bit mutual information normalization adjustment step length corresponding to the bit error rate of the second number of subframes to obtain second adjusted bit mutual information, and calculating the channel quality indication CQI reported to the base station according to the second adjusted bit mutual information.
6. The apparatus of claim 5, wherein the calculating module is configured to use a ratio of the number of CRC codes in the first number of subframes to the first number as the error rate of the first number of subframes.
7. The apparatus of claim 5, wherein the mapping table of the ber adjustment threshold and the mutual bit information normalization adjustment step size is determined according to an actual network situation where the terminal is located.
8. The apparatus of claim 5, wherein the second number is twice the first number.
9. A mobile terminal, characterized in that it comprises the apparatus for dynamically adjusting CQI based on bit error rate according to any of claims 5 to 8.
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| CN102098147A (en) * | 2011-02-01 | 2011-06-15 | 上海华为技术有限公司 | CQI adjustment method, user equipment, base station and system |
| CN102271026A (en) * | 2011-07-27 | 2011-12-07 | 东南大学 | Closed-loop self-adaptive transmission method used for uplink of advanced long-term evolution system |
| CN102761397A (en) * | 2011-04-25 | 2012-10-31 | 中国移动通信集团重庆有限公司 | CQI regulation method, device and system |
| CN104660365A (en) * | 2013-11-18 | 2015-05-27 | 展讯通信（上海）有限公司 | Channel state measuring method, device and user terminal |
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| US9107091B2 (en) * | 2011-05-23 | 2015-08-11 | Mediatek Inc. | Method and apparatus reporting channel quality indicator of communication system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102098147A (en) * | 2011-02-01 | 2011-06-15 | 上海华为技术有限公司 | CQI adjustment method, user equipment, base station and system |
| CN102761397A (en) * | 2011-04-25 | 2012-10-31 | 中国移动通信集团重庆有限公司 | CQI regulation method, device and system |
| CN102271026A (en) * | 2011-07-27 | 2011-12-07 | 东南大学 | Closed-loop self-adaptive transmission method used for uplink of advanced long-term evolution system |
| CN104660365A (en) * | 2013-11-18 | 2015-05-27 | 展讯通信（上海）有限公司 | Channel state measuring method, device and user terminal |
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