CN111885635B - Method for improving CQI detection performance - Google Patents
Method for improving CQI detection performance Download PDFInfo
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- CN111885635B CN111885635B CN202010657893.2A CN202010657893A CN111885635B CN 111885635 B CN111885635 B CN 111885635B CN 202010657893 A CN202010657893 A CN 202010657893A CN 111885635 B CN111885635 B CN 111885635B
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- 238000001514 detection method Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000005259 measurement Methods 0.000 claims abstract description 13
- 230000005540 biological transmission Effects 0.000 claims abstract description 9
- 125000004122 cyclic group Chemical group 0.000 claims description 4
- 238000013507 mapping Methods 0.000 claims description 4
- 230000006854 communication Effects 0.000 abstract description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000737 periodic effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013468 resource allocation Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
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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
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
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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
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
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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
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
- H04L5/0057—Physical resource allocation for CQI
Abstract
The application discloses a method for improving the detection performance of a Physical Uplink Control Channel (PUCCH) quality indicator (CQI), which comprises the following steps: step 1, UE receives downlink data sent by eNB to carry out channel quality measurement; step 2, the UE feeds back the measured result to the eNB on the PUCCH through a channel quality indication CQI value; step 3, detecting channel quality indication CQI in the PUCCH channel, carrying out discontinuous transmission DTX judgment on the channel quality indication CQI in the PUCCH channel, and if the channel quality indication CQI is not DTX, continuing to analyze to obtain a channel quality indication CQI value; step 4, the eNB adjusts the downlink modulation and coding strategy mcs according to the obtained CQI value, if the CQI value is DTX, the last CQI value is used; and 5, the eNB sends the data stream to the UE according to the modulation and coding strategy mcs. The method can solve the problem that the eNB side can not correctly detect the CQI value and can not correctly carry out downlink scheduling, and the average downlink flow is improved in the communication process of the eNB and the UE.
Description
Technical Field
The application relates to the technical field of CQI information detection, in particular to a method for improving the CQI detection performance of a PUCCH channel quality indicator.
Background
CQI-Channel Quality Indication, channel quality indication, is mainly measured by the UE, so CQI reflects the downlink channel quality. In the current communication process supporting LTE, UE performs channel estimation measurement through received downlink data, then selects a proper CQI value by combining a measurement result with a downlink PDSCH error rate, and feeds back to LTE eNB on a PUCCH/PUSCH channel. The eNB side acquires the quality condition of the downlink channel by detecting the periodic or aperiodic CQI value sent by the UE on the PUCCH/PUSCH, and then performs downlink mcs scheduling, namely, a proper modulation mode is used for sending TB (Transport Block) with a proper size, so that whether the CQI can be correctly detected can influence the downlink throughput. In the current LTE system, the CQI value is obtained by directly demodulating, descrambling and decoding after the ZC sequence is decoded, so that in the special cases that the CQI is not transmitted or the uplink channel quality is poor, the SINR is low, and at this time, the CQI value obtained by continuously demodulating, descrambling and decoding is an error value, and the true downlink channel quality cannot be fed back. The use of this erroneous CQI value to indicate downlink scheduling results in a significant impact on downlink throughput. A specific implementation flow is shown in fig. 1.
Based on the technical problems in the prior art, the application provides a method for improving the CQI detection performance of the PUCCH channel quality indication.
Disclosure of Invention
Aiming at the defects of the prior art, the application provides a method for improving the CQI detection performance of the PUCCH channel quality indication.
The application adopts the following technical scheme:
a method for improving the performance of PUCCH channel quality indication CQI detection, comprising the steps of:
step 1, user Equipment (UE) receives downlink data sent by a base station (eNB) to measure channel quality;
step 2, the UE feeds back the measured result to the eNB on the PUCCH through a channel quality indication CQI value;
step 3, detecting CQI in the PUCCH channel, carrying out discontinuous transmission DTX judgment on the CQI in the PUCCH channel, and if the CQI is not DTX, continuing to analyze to obtain a CQI value;
step 4, the eNB adjusts the downlink modulation and coding strategy mcs according to the obtained CQI value, if the CQI value is DTX, the last CQI value is used;
and 5, the eNB sends the data stream to the UE according to the mcs.
Further, in step 1, the method includes the following steps:
step 1.1, after receiving physical downlink shared channel PDSCH data, UE carries out channel estimation and downlink channel quality measurement and obtains downlink channel quality according to a channel measurement result;
and step 1.2, the UE selects a CQI value according to the channel measurement result and the PDSCH error rate, wherein the CQI value can enable the error rate of the PDSCH to be less than 10%.
Further, in step 2, the UE encodes, scrambles, modulates, multiplies the ZC sequence, physically maps to the PUCCH channel, and transmits the result to the eNB.
Further, in step 3, the method includes the following steps:
step 3.1, the eNB receives uplink data, carries out ZC decoding according to parameters of cyclic shift of an RB and a ZC sequence where CQI is sent by UE, obtains signal power of a channel where the CQI of the UE is located, and obtains signal-to-interference-plus-noise ratio SINR of the UE by calculating power of other non-user channels on the RB;
step 3.2, DTX judgment is carried out through the calculated SINR of the UE and the UE CQI detection threshold value, if the SINR is smaller than the threshold value, the signal power is low, the UE is considered to not successfully send CQI, and the CQI result is DTX; otherwise, the UE is considered to successfully send CQI;
and 3.3, if the CQI result is judged not to be DTX, performing CQI demodulation, descrambling and decoding to obtain a CQI value.
In step 3, the eNB performs CQI DTX detection according to the size of CQI SINR, if the SINR is not less than the set threshold value, the SINR is non-DTX, and the specific value of CQI is analyzed; if SINR < the threshold value, the CQI is DTX.
Further, in step 4, the eNB physical layer reports the CQI value obtained by parsing to the MAC layer.
Further, in step 5, the method includes the following steps:
step 5.1, the MAC layer generates a downlink scheduling message of a coding strategy mcs, TBSize and a modulation mode according to the obtained CQI value;
step 5.2, the MAC layer sends the downlink scheduling message to the eNB physical layer, and simultaneously informs the RLC layer of sending the TBSsize data block;
and 5.3, the eNB physical layer performs coding, scrambling, modulation and physical mapping of downlink data blocks to the PDSCH according to the received downlink scheduling message and the data stream issued by the RLC layer, and then transmits the downlink scheduling message and the data stream to the UE.
Compared with the prior art, the application has the beneficial effects that:
1. the method for improving the CQI detection performance of the PUCCH channel quality indication can solve the problem that the eNB side cannot accurately detect the CQI value and cannot accurately perform downlink scheduling, so that the downlink flow is affected;
2. according to the method for improving the CQI detection performance of the PUCCH channel quality indication, in the communication process of the eNB and the UE, the downlink average flow is improved.
Drawings
Fig. 1 is a schematic diagram of a flow of detecting CQI values in the prior art;
fig. 2 is a flowchart of a method for improving PUCCH channel quality indication CQI detection performance in an embodiment of the present application;
fig. 3 is a flowchart of an LTE eNB communication device PUCCH CQI detection procedure;
FIG. 4 is a schematic diagram of downstream traffic monitoring in the prior art;
fig. 5 is a schematic diagram of downstream traffic monitoring according to the method of the embodiment of the present application.
Detailed Description
In order that the above-recited objects, features and advantages of the present application can be more clearly understood, a more particular description of the application will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings, it being understood that embodiments of the application and features of the embodiments may be combined with each other without departing from the scope of the appended claims.
Examples
As shown in fig. 2, a method for improving the detection performance of the PUCCH channel quality indicator CQI includes the following steps:
step 1, user Equipment (UE) receives downlink data sent by a base station (eNB) to measure channel quality;
step 1.1, after receiving physical downlink shared channel PDSCH data, UE carries out channel estimation and downlink channel quality measurement and obtains downlink channel quality according to a channel measurement result;
step 1.2, the UE selects a CQI value according to a channel measurement result and the PDSCH error rate, wherein the CQI value can enable the error rate of the PDSCH to be less than 10%;
step 2, the UE feeds back the measured result to the eNB at the base station side on the PUCCH channel through the CQI value, wherein the UE carries out the processes of coding, scrambling, modulating, multiplying the ZC sequence and physically mapping to the PUCCH channel on the acquired CQI value;
step 3, detecting channel quality indication CQI in the PUCCH channel, carrying out discontinuous transmission DTX judgment on the CQI in the PUCCH channel, and if the CQI is not DTX, continuing to analyze to obtain a CQI value;
step 3.1, the eNB receives uplink data, carries out ZC decoding according to parameters of cyclic shift of an RB and a ZC sequence where the CQI is sent by the UE to obtain signal power of a channel where the CQI is located by the UE, and obtains the signal to interference plus noise ratio SINR of the UE by calculating power of other non-user channels on the RB (resource unit of service channel resource allocation, 12 subcarriers in frequency, one time slot in time domain, called 1 RB);
step 3.2, DTX judgment is carried out through the calculated SINR of the UE and the UE CQI detection threshold value, if the SINR is smaller than the threshold value, the signal power is low, the UE is considered to not successfully send CQI, and the CQI result is DTX; otherwise, the UE is considered to successfully send CQI;
step 3.3, if the CQI result is judged not to be DTX, then CQI demodulation, descrambling and decoding are carried out to obtain a CQI value;
step 4, the eNB adjusts the downlink modulation and coding strategy mcs according to the obtained CQI value, if the CQI value is DTX, the last CQI value is used, and the eNB physical layer reports the CQI value obtained by analysis to the MAC layer;
step 5, the eNB sends a data stream to the UE according to the modulation and coding strategy mcs;
step 5.1, the MAC layer generates a downlink scheduling message of a coding strategy mcs, TBSize and a modulation mode according to the obtained CQI value;
step 5.2, the MAC layer sends the downlink scheduling message to the eNB physical layer, and simultaneously informs the RLC layer of sending the TBSsize data block;
and 5.3, the eNB physical layer performs coding, scrambling, modulation and physical mapping of downlink data blocks to the PDSCH according to the received downlink scheduling message and the data stream issued by the RLC layer, and then transmits the downlink scheduling message and the data stream to the UE.
In step 1.2 of this embodiment, after obtaining the channel measurement result, the UE evaluates the downlink characteristic according to the SINR, determines the available downlink block error rate BLER under the SINR condition, and selects the CQI value according to the constraint that the BLER is less than 10%.
In step 2 of this embodiment, CQI is represented by a bit stream composed of a plurality of bits, and the bit stream needs to be encoded, scrambled, modulated into symbols, multiplied by ZC sequences, and finally mapped onto allocated time-frequency resources before transmission.
In step 3 of the present embodiment, the eNB performs CQI DTX detection according to the CQI signal and SINR, if the SINR is not less than or equal to the set threshold value, the eNB analyzes the specific value of the CQI; if SINR < the threshold value, the CQI is DTX.
The CQI DTX detection refers to detection in a discontinuous transmission state of CQI, that is, CQI cannot be detected on a time-frequency resource corresponding to CQI.
As shown in fig. 3, each UE accessing to the base station will configure a periodic CQI, and the eNB side periodically detects the CQI value fed back by each UE through the PUCCH channel without PUSCH transmission;
in this embodiment, by using the autocorrelation of ZC sequences (Zadoff-Chu sequences), each UE transmits on the RBs allocated by PUCCH through code division multiplexing by multiplying ZC sequences with different cyclic shifts, the eNB side obtains the SINR of the code channel where each UE is located by decoding the ZC sequences, compares the SINR with a threshold value, if the SINR is greater than or equal to the threshold value, it indicates that the code channel has obvious transmission power, and can detect the CQI, and further analyze the CQI value, if the SINR is less than the threshold value, it indicates that no valid transmission power is detected at this time, the UE does not transmit the CQI in the correct code channel, and the CQI is DTX, and does not need to further analyze the CQI value;
if the CQI is detected as DTX, directly reporting the previous CQI without analyzing the CQI; if the CQI is detected to be non-DTX, analyzing the CQI value;
reporting the analyzed CQI value;
and the MAC layer performs downlink scheduling according to the reported CQI value.
As shown in fig. 4-5, by monitoring the downlink flow rate by the detection method in this embodiment, the average flow rate is increased from 80.2M to 80.5M by 0.37% compared with the two flow rate monitoring results.
The present application is not limited to the above-described embodiments, and the above-described embodiments and descriptions are merely illustrative of the principles of the present application, and various changes and modifications may be made therein without departing from the spirit and scope of the application, which is defined in the appended claims. The scope of the application is defined by the appended claims.
Claims (6)
1. A method for improving the performance of PUCCH channel quality indicator CQI detection, comprising the steps of:
step 1, user Equipment (UE) receives downlink data sent by a base station (eNB) to measure channel quality;
step 2, the UE feeds back the measured result to the eNB on the PUCCH through a channel quality indication CQI value;
step 3, detecting CQI in the PUCCH channel, carrying out discontinuous transmission DTX judgment on the CQI in the PUCCH channel, and if the CQI is not DTX, continuing to analyze to obtain a CQI value;
step 3.1, the eNB receives uplink data, carries out ZC decoding according to parameters of cyclic shift of an RB and a ZC sequence where CQI is sent by UE, obtains signal power of a channel where the CQI of the UE is located, and obtains signal-to-interference-plus-noise ratio SINR of the UE by calculating power of other non-user channels on the RB;
step 3.2, DTX judgment is carried out through the calculated SINR of the UE and the UE CQI detection threshold value, if the SINR is smaller than the threshold value, the signal power is low, the UE is considered to not successfully send CQI, and the CQI result is DTX; otherwise, the UE is considered to successfully send CQI;
step 3.3, if the CQI result is judged not to be DTX, then CQI demodulation, descrambling and decoding are carried out to obtain a CQI value;
step 4, the eNB adjusts the downlink modulation and coding strategy mcs according to the obtained CQI value, if the CQI value is DTX, the last CQI value is used;
and 5, the eNB sends the data stream to the UE according to the mcs.
2. The method for improving the performance of PUCCH channel quality indication CQI detection according to claim 1, comprising the steps of:
step 1.1, after receiving physical downlink shared channel PDSCH data, UE carries out channel estimation and downlink channel quality measurement and obtains downlink channel quality according to a channel measurement result;
and step 1.2, the UE selects a CQI value according to the channel measurement result and the PDSCH error rate, wherein the CQI value can enable the error rate of the PDSCH to be less than 10%.
3. The method for improving the performance of PUCCH channel quality indicator CQI detection according to claim 1, wherein in step 2, the UE encodes, scrambles, modulates, multiplies ZC sequences, physically maps the obtained CQI value to a PUCCH channel, and then transmits the PUCCH channel to the eNB.
4. The method for improving the performance of detecting the CQI for the PUCCH channel quality indication according to claim 1, wherein in the step 3, the eNB performs CQIDTTX detection according to the size of the CQI SINR, if the SINR is not less than or equal to a set threshold value, the SINR is non-DTX, and a specific value of the CQI is analyzed; if SINR < the threshold value, the CQI is DTX.
5. The method for improving the CQI detection performance of PUCCH channel quality indication according to claim 1, wherein in step 4, the eNB physical layer reports the CQI value obtained by parsing to the MAC layer.
6. The method for improving the performance of PUCCH channel quality indicator CQI detection according to claim 5, comprising the steps of:
step 5.1, the MAC layer generates a downlink scheduling message of a coding strategy mcs, TBSize and a modulation mode according to the obtained CQI value;
step 5.2, the MAC layer sends the downlink scheduling message to the eNB physical layer, and simultaneously informs the RLC layer of sending the TBSsize data block;
and 5.3, the eNB physical layer performs coding, scrambling, modulation and physical mapping of downlink data blocks to the PDSCH according to the received downlink scheduling message and the data stream issued by the RLC layer, and then transmits the downlink scheduling message and the data stream to the UE.
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