CN112235871B - Scheduling method of multi-input multi-output system - Google Patents
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- CN112235871B CN112235871B CN202011019815.6A CN202011019815A CN112235871B CN 112235871 B CN112235871 B CN 112235871B CN 202011019815 A CN202011019815 A CN 202011019815A CN 112235871 B CN112235871 B CN 112235871B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
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- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
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- H04B7/0452—Multi-user MIMO systems
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Abstract
The invention provides a scheduling method of a multi-input multi-output system, which comprises the following steps: step 1, processing Rank and CQI information reported by UE, and updating inner loop values of different ranks; step 2, processing ACK/NACK information reported by the UE, and updating outer ring values of different ranks; step 3, respectively calculating final outer ring values according to Rank 1 and Rank 2; the method has the advantages that the scheduling state of rank switching points is closer to the actual channel state by lifting the outer ring frequency spectrum efficiency when the outer ring is invalid, the problem that the outer ring convergence is slow due to the fact that the difference between the default value and the actual channel state is large caused by the fact that the processing for resetting the outer ring frequency spectrum efficiency as the initial value when the outer ring is invalid in the prior art is solved, the outer ring deviation is about 1 Step when the rank outer ring is invalid in the method for scheduling rank switching, and therefore theoretically, the outer ring can be converged only by 1 ACK/NAK feedback information and is very close to the actual channel state.
Description
Technical Field
The invention relates to the field of mobile communication, in particular to a scheduling method of a multi-input multi-output system.
Background
An adaptive scheduling method of a Multiple-Input Multiple-Output (MIMO) system is a very important Radio resource management algorithm in LTE (Long Term Evolution) or NR (New Radio interface), one of the main functions of which is to obtain a downlink Channel condition according to rank and CQI (Channel Quality Indication) reported by a UE.
In the existing LTE or NR network, a downlink MIMO Rank adaptive scheduling method is shown in fig. 1; for the 2-sending and 2-receiving system, rank takes a value of 1 or 2; and for each Rank, maintaining respective inner ring and outer ring values, wherein the frequency spectrum efficiency is determined by the inner ring and the outer ring together, and the base station selects the Rank with higher frequency spectrum efficiency when scheduling each time.
The inner ring is determined according to the CQI reported by the UE, the CQI of different Rank can be converted with each other, and the inner rings of two ranks are effective as long as one Rank CQI is reported. The outer ring is obtained according to the statistical information of the ACK/NACK of different ranks and has timeliness. And if the certain time threshold is exceeded and no ACK/NACK feedback information under the corresponding Rank exists, the outer ring of the Rank is considered to be invalid.
The existing algorithm is designed on the premise that inner and outer rings of different ranks are effective, so that the problem of outer ring failure must be solved, and a typical solution is as follows: if the Rank outer loop fails, it is reset to a default value. The above prior art mainly has the following problems:
the outer ring is invalid and reset to a default value, the problem that the deviation between the default value and an actual value is overlarge exists, if Rank switching occurs at the moment, the target Rank frequency spectrum efficiency is not matched with an actual channel, the outer ring convergence needs a long time, and the service perception is influenced. For example, in the LTE uplink/downlink configuration 1, if the deviation is 10 steps (Step size), and NACK is adjusted to 1 Step each time, 10 NACKs are needed to be adjusted in place, and approximately 20 milliseconds are needed to be converged.
For example, in the prior art, chinese patent application No. 201610352743.4 discloses a MIMO mode switching control method and apparatus, wherein the method includes: determining inner ring frequency spectrum efficiency of at least two MIMO modes to be selected according to CQI reported by a terminal, updating outer ring frequency spectrum efficiency of the at least two MIMO modes to be selected at the scheduling ending moment of the terminal, and selecting the MIMO mode with the maximum sum of the inner ring frequency spectrum efficiency and the outer ring frequency spectrum efficiency of the at least two MIMO modes to be selected at the scheduling starting moment as the current scheduling MIMO mode. According to the MIMO mode switching control method and device, the MIMO mode with the largest sum of the inner ring frequency spectrum efficiency and the outer ring frequency spectrum efficiency in the at least two MIMO modes to be selected is selected at the starting time of scheduling and serves as the current scheduling MIMO mode, and the target Rank frequency spectrum efficiency is not matched with an actual channel.
As another example, chinese patent publication No. CN1708933B provides closed loop rate control for data transmission on multiple parallel channels, with an inner loop estimating the channel conditions of the communication link and selecting an appropriate data rate for each of the multiple parallel channels based on the channel estimates. For each parallel channel, the received SNR is calculated based on the channel estimate, the operating SNR is calculated based on the received SNR and an SNR offset for the parallel channel, and the data rate is selected based on the operating SNR for the parallel channel and a set of required SNRs for a set of data rates supported by the system. The outer loop estimates the quality of data transmissions received on multiple parallel channels and adjusts the operation of the inner loop. For example, the SNR offset for each parallel channel is adjusted based on the state of packets received on that parallel channel.
For another example, the chinese patent application No. 201210072234.8 discloses a method for receiving a channel transmitted by a user equipment UE, and determining a rank used by the UE according to rank indication information carried on at least one of the received channels; determining a rank used by the UE according to rank indication information carried by at least one of the received channels, including: detecting the channel type of a channel sent by UE, and acquiring first rank information according to the detection result; acquiring rank indication information borne on the at least one channel to obtain second rank information; and comparing the first rank information with the second rank information, and determining the rank used by the UE according to the comparison result.
The above patent application has a problem that the outer loop is failed to reset to a default value, and the deviation between the default value and an actual value is too large, and the problem that the outer loop convergence time is long in the MIMO adaptive scheme cannot be solved.
Disclosure of Invention
The invention provides a scheduling method of a multi-input multi-output system, which comprises the following steps:
step 1, processing Rank and CQI information reported by UE, and updating inner loop values of different ranks.
And step 2, processing the ACK/NACK information reported by the UE and updating outer loop values of different ranks.
And 3, respectively calculating final outer ring values according to the Rank of 1 and the Rank of 2.
And 4, respectively determining the final frequency spectrum efficiency according to the Rank 1 and the Rank 2, and selecting the Rank with high frequency spectrum efficiency for scheduling.
Further, the step 1 of processing Rank and CQI information reported by the UE and updating inner loop values of different ranks includes the following steps:
1.1, when reporting a Rank =1 CQI, converting the Rank =2 CQI according to the equal spectral efficiency;
step 1.2, when the reported CQI of Rank =2, converting the CQI of Rank =1 according to the equal spectral efficiency;
and step 1.3, converting the CQI into an inner loop value according to the CQI of Rank =1 and Rank =2 respectively.
Further, the step 2 of processing the ACK/NACK information reported by the UE and updating outer loop values of different ranks includes the following steps:
step 2.1, determining according to the initial packet error rate of data transmission as 10%: when the report is ACK, the outer ring value corresponding to the scheduled rank is raised by 1 step, and the outer ring value corresponding to the unscheduled rank is kept unchanged;
step 2.2, when the report is NACK, the outer ring value corresponding to the scheduling rank is reduced by 9 steps, and the outer ring value corresponding to the unscheduled rank is kept unchanged; determining a final outer loop value by combining the maximum value and the minimum value limit of the outer loop value;
further, in step 3, the calculating the final outer loop values according to Rank 1 and Rank 2 respectively includes the following steps:
step 3.1, for the outer ring of Rank =1, when the time of continuously having no ACK/NACK data exceeds a first threshold Th1 and the outer ring of Rank =2 does not exceed a second threshold Th2, increasing 1 Step to the outer ring; otherwise, the external environment is kept unchanged; determining a final outer ring by combining the maximum limit of the outer ring value;
step 3.2, for the Rank =2 outer loop, if the time of continuous no ACK/NACK data exceeds the first threshold Th1 and the Rank =1 outer loop does not exceed the second threshold Th2, then the outer loop is increased by 1 Step; otherwise, the external environment is kept unchanged; determining a final outer loop value by combining the maximum limit of the outer loop value;
further, in step 4, the final spectrum efficiency is respectively determined according to the Rank 1 and the Rank 2, and the Rank with the higher spectrum efficiency is selected for scheduling, which includes the following steps:
step 4.1, rank =1, spectral efficiency = Rank =1, inner ring + Rank =1 outer ring;
step 4.2, rank =2, spectral efficiency = Rank =2, inner ring + Rank =2 outer ring;
and 4.3, selecting the Rank with larger frequency spectrum effect.
The invention has the following advantages:
the scheduling method of the MIMO system provided by the invention has the advantages that the scheduling condition at rank switching points is closer to the actual channel condition by raising the outer ring frequency spectrum efficiency when the outer ring fails, and the problem that the outer ring convergence is slow due to larger difference between the default value and the actual channel state caused by the processing of resetting the outer ring frequency spectrum efficiency as the initial value when the outer ring fails in the prior art is solved. Leading to the problems of throughput degradation and large delay, and further affecting the user experience.
2, the scheduling method of the MIMO system of the invention switches and schedules rank when the rank outer loop is invalid, the introduced outer loop deviation is about 1 Step, thus theoretically, the outer loop can be converged only by 1 ACK/NAK feedback information, and the actual channel condition is very close.
Drawings
Fig. 1 illustrates a downlink MIMO Rank adaptive scheduling method in an existing LTE or NR network;
FIG. 2 is a flow chart illustrating a scheduling method of a MIMO system according to the present invention;
fig. 3 is a schematic diagram of two Rank outer ring lifting processing flows according to an embodiment of the scheduling method for a mimo system of the present invention.
Detailed Description
The following describes in detail a specific embodiment of the scheduling method of the mimo system according to the present invention with reference to fig. 1 to 3 of the specification.
The scheduling method of the multi-input multi-output system comprises the following steps:
step 1, as shown in fig. 2, processing Rank and CQI information reported by UE, and updating inner loop values of different ranks;
step 2, processing ACK/NACK information reported by the UE, and updating outer loop values of different ranks;
and 3, respectively calculating final outer ring values according to the Rank of 1 and the Rank of 2.
And 4, respectively determining the final frequency spectrum efficiency according to the Rank 1 and the Rank 2, and selecting the Rank with higher frequency spectrum efficiency for scheduling.
Further, as shown in fig. 2, the processing of Rank and CQI information reported by the UE in step 1, and updating the inner loop values of different ranks includes the following steps:
step 1.1, when the reported CQI with Rank =1, converting the CQI with Rank =2 according to the equal spectral efficiency;
step 1.2, when the reported CQI with Rank =2, converting the CQI with Rank =1 according to the equal spectrum efficiency;
and step 1.3, converting the CQI into an inner loop value according to the CQI of Rank =1 and Rank =2 respectively.
Further, the step 2 of processing the ACK/NACK information reported by the UE and updating outer loop values of different ranks includes the following steps:
step 2.1, determining according to the initial packet error rate of data transmission as 10%: when the report is ACK, the outer ring value corresponding to the scheduled rank is raised by 1 step, and the outer ring value corresponding to the unscheduled rank is kept unchanged;
step 2.2, when the report is NACK, the outer ring value corresponding to the scheduling rank is reduced by 9 steps, and the outer ring value corresponding to the unscheduled rank is kept unchanged; determining a final outer loop value by combining the maximum value and the minimum value limit of the outer loop value;
further, as shown in fig. 3, the step 3 of calculating the final outer loop value according to Rank 1 and Rank 2 respectively includes the following steps:
step 3.1, for the Rank =1 outer ring, when the time of continuously no ACK/NACK data exceeds a first threshold Th1 and the Rank =2 outer ring does not exceed a second threshold Th2, increasing 1 Step for the outer ring; otherwise, the external environment is kept unchanged; determining a final outer ring by combining the maximum limit of the outer ring value;
step 3.2, for the outer ring of Rank =2, if the time of continuously no ACK/NACK data exceeds a first threshold Th1 and the outer ring of Rank =1 does not exceed a second threshold Th2, then the outer ring is increased by 1 Step; otherwise, the external environment is kept unchanged; determining a final outer loop value by combining the maximum limit of the outer loop value;
further, in step 4, the final spectrum efficiency is respectively determined according to the Rank 1 and the Rank 2, and the Rank with the higher spectrum efficiency is selected for scheduling, which includes the following steps:
step 4.1, rank =1, spectral efficiency = Rank =1, inner ring + Rank =1 outer ring;
step 4.2, rank =2, spectral efficiency = Rank =2, inner ring + Rank =2 outer ring;
and 4.3, selecting the Rank with the maximum spectrum efficiency.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. A scheduling method of a multi-input multi-output system is characterized by comprising the following steps:
step 1, processing Rank and CQI information reported by UE, and updating inner loop values of different ranks, comprising:
1.1, when reporting a Rank =1 CQI, converting the Rank =2 CQI according to the equal spectral efficiency;
step 1.2, when the reported CQI of Rank =2, converting the CQI of Rank =1 according to the equal spectral efficiency;
step 1.3, converting the CQI into an inner loop value according to the respective CQI of Rank =1 and Rank = 2;
step 2, processing the ACK/NACK information reported by the UE, and updating outer-loop values of different ranks, including:
step 2.1, determining according to the initial packet error rate of data transmission as 10%: when the report is ACK, the outer ring value corresponding to the scheduled rank is raised by 1 step, and the outer ring value corresponding to the unscheduled rank is kept unchanged;
step 2.2, when the report is NACK, the outer ring value corresponding to the scheduling rank is reduced by 9 steps, and the outer ring value corresponding to the unscheduled rank is kept unchanged; determining a final outer loop value by combining the maximum value and the minimum value limit of the outer loop value;
and 3, respectively calculating final outer ring values according to the Rank of 1 and the Rank of 2:
step 3.1, for the outer ring of Rank =1, when the time of continuously having no ACK/NACK data exceeds a first threshold Th1 and the outer ring of Rank =2 does not exceed a second threshold Th2, increasing 1 Step to the outer ring; otherwise, the external environment is kept unchanged; determining a final outer ring by combining the maximum limit of the outer ring value;
step 3.2, for the Rank =2 outer loop, if the time of continuous no ACK/NACK data exceeds the first threshold Th1 and the Rank =1 outer loop does not exceed the second threshold Th2, then the outer loop is increased by 1 Step; otherwise, the external environment is kept unchanged; determining a final outer loop value by combining the maximum limit of the outer loop value;
and 4, respectively determining final frequency spectrum efficiency according to the Rank 1 and the Rank 2, and selecting the Rank with high frequency spectrum efficiency for scheduling:
step 4.1, rank =1, spectral efficiency = Rank =1, inner ring + Rank =1 outer ring;
step 4.2, rank =2, spectral efficiency = Rank =2, inner ring + Rank =2 outer ring;
and 4.3, selecting a Rank with larger frequency spectrum effect.
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| CN1369178A (en) * | 1999-06-14 | 2002-09-11 | 高通股份有限公司 | Method and apparatus for disabling communications of specified mode to device capable of multi-mode commnications |
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| CN102480343B (en) * | 2010-11-22 | 2016-01-13 | 中兴通讯股份有限公司 | The processing method of back haul link ACK/NACK information and system |
| CN102045144A (en) * | 2011-01-17 | 2011-05-04 | 电信科学技术研究院 | Method and device for feeding back ACK/NACK (Acknowledgement/Negative Acknowledgement) information |
| CN102075310B (en) * | 2011-02-25 | 2013-11-20 | 电信科学技术研究院 | Method and device for processing acknowledgement/negative acknowledgement (ACK/NACK) feedback in carrier reconfiguration |
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Inventor after: Jia Honghai Inventor after: Zhao Xianming Inventor before: Jia Honghai |
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