CN108768589B - Method and device for adjusting initial MCS configuration - Google Patents

Method and device for adjusting initial MCS configuration Download PDF

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CN108768589B
CN108768589B CN201810496681.3A CN201810496681A CN108768589B CN 108768589 B CN108768589 B CN 108768589B CN 201810496681 A CN201810496681 A CN 201810496681A CN 108768589 B CN108768589 B CN 108768589B
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demodulation
initial mcs
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coverage
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CN108768589A (en
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申如意
廖礼宇
刘震
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Comba Network Systems Co Ltd
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Comba Telecom Systems China Ltd
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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
    • 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
    • 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
    • H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
    • 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
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • 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
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]

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Abstract

The invention discloses a method for adjusting initial MCS configuration, which comprises the following steps: in a preset period, respectively calculating the demodulation probability information of each coverage grade according to the HARQ information of the user equipment corresponding to each coverage grade; and adjusting the initial MCS value of the narrowband Internet of things system according to the comparison result of the demodulation probability information of each coverage level and a set probability threshold. An apparatus for adjusting an initial MCS configuration is also disclosed. The method has the advantages that the initial MCS value is adaptively adjusted according to the HARQ information of all user equipment under each coverage level of the cell covered by the narrowband Internet of things system in the preset period, so that the problems of more user equipment retransmission, low system resource utilization rate and poor overall performance of the system caused by unreasonable initial MCS configuration are effectively solved; the demodulation performance and the system resource utilization rate of the user equipment are greatly improved, the scene applicability and the accuracy of the initial MCS configuration are improved, and the overall performance of the system is greatly improved.

Description

Method and device for adjusting initial MCS configuration
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for adjusting initial MCS configuration.
Background
In the development of the Internet of Things, numerous wireless Internet of Things access technologies appear, such as Zigbee (low power consumption local area network protocol based on ieee802.15.4 standard), wifi (wireless local area network based on ieee802.11b standard) technology, bluetooth technology, long range (long range) technology, SigFox (ultra Narrow Band) technology, and NB-IOT (Narrow Band Internet of Things) technology, wherein NB-IOT technology is favored by the industry due to its low power consumption wide coverage.
With the commercial promotion of NB-IOT technology products, there are many technology points which need to be solved urgently, for example, the determination of adaptive Coding Modulation, i.e. the determination of Modulation and Coding Scheme (MCS), which is one of the key technology points, and the initial MCS configuration therein is important for NB-IOT systems (narrowband internet of things systems). For NB-IOT systems, data transmission is generally performed by a CP (control plane) scheme in the industry, and a fixed initial MCS configuration is usually adopted.
However, in the above conventional initial MCS configuration scheme, there is a problem that the overall performance of the NB-IOT system is poor.
Disclosure of Invention
Based on the above-mentioned problems of the conventional initial MCS configuration, the present invention provides a method for adjusting the initial MCS configuration, and an apparatus for adjusting the initial MCS configuration.
In order to achieve the above object, in one aspect, an embodiment of the present invention provides a method for adjusting an initial MCS configuration, including the following steps:
in a preset period, respectively calculating the demodulation probability information of each coverage grade according to the HARQ information of the user equipment corresponding to each coverage grade; wherein the demodulation probability information comprises a demodulation correct rate and a demodulation error rate;
and adjusting the initial MCS value of the narrowband Internet of things system according to the comparison result of the demodulation probability information of each coverage level and a set probability threshold.
In one embodiment, the set probability threshold includes a maximum demodulation correct rate threshold and a minimum demodulation error rate threshold;
the step of adjusting the initial MCS value of the narrowband Internet of things system according to the comparison result of the demodulation probability information of each coverage level and the set probability threshold comprises the following steps:
if the demodulation accuracy of any one of the coverage levels is continuously greater than the maximum demodulation accuracy threshold for a first set number of times, or if the demodulation error rate of any one of the coverage levels is continuously less than the minimum demodulation error rate threshold for a second set number of times, adding a set up step length to the initial MCS value of the coverage level.
In one embodiment, the set probability threshold includes a minimum demodulation correct rate threshold and a maximum demodulation error rate threshold;
the step of adjusting the initial MCS value of the narrowband Internet of things system according to the comparison result of the demodulation probability information of each coverage level and the set probability threshold comprises the following steps:
if the demodulation accuracy of any one of the coverage levels is continuously less than the minimum demodulation accuracy threshold for a third set number of times, or if the demodulation error rate of any one of the coverage levels is continuously greater than the maximum demodulation error rate threshold for a fourth set number of times, the initial MCS value of the coverage level is decreased by a set down step.
In one embodiment, the method further comprises:
and if the initial MCS value reaches a preset upper calling value threshold, maintaining the initial MCS value of the coverage level.
In one embodiment, the method further comprises:
and if the initial MCS value reaches a preset down-regulation value threshold, maintaining the initial MCS value of the coverage level.
In one embodiment, the step of adjusting an initial MCS value of the narrowband internet of things system according to the comparison result between the demodulation probability information of each coverage level and a set probability threshold further includes:
if the demodulation correct rate of any of the coverage levels is greater than the minimum demodulation correct rate threshold and less than the maximum demodulation correct rate threshold, or if the demodulation error rate of any of the coverage levels is less than the maximum demodulation error rate threshold and greater than the minimum demodulation error rate threshold, maintaining the initial MCS value of the coverage level.
In one embodiment, before the step of calculating the demodulation probability information of each coverage class according to the HARQ information of the ue corresponding to each coverage class in a preset period, the method further includes:
in the preset period, respectively acquiring the HARQ information of each user equipment corresponding to each coverage grade in a target area; the HARQ information includes ACK information, NACK information, and MISS information of newly transmitted data of each of the user equipments.
In one embodiment, the demodulation accuracy is a ratio of the number of times of ACK information fed back by each ue in the same coverage level to a sum of the number of times of ACK information, NACK information, and MISS information.
In one embodiment, the demodulation error rate is a ratio of the number of times of NACK information and MISS information fed back by each ue in the same coverage level to a sum of the number of times of ACK information, NACK information, and MISS information.
In another aspect, an embodiment of the present invention provides an apparatus for adjusting initial MCS configuration, including:
the probability calculation module is used for calculating the demodulation probability information of each coverage grade according to the HARQ information of the user equipment corresponding to each coverage grade in a preset period; wherein the demodulation probability information comprises a demodulation correct rate and a demodulation error rate;
and the statistic adjusting module is used for adjusting the initial MCS value of the narrowband Internet of things system according to the comparison result of the demodulation probability information of each coverage level and a set probability threshold.
In still another aspect, an embodiment of the present invention further provides a computer device, including a memory and a processor, where the memory stores a computer program executable on the processor, and the processor implements the steps of the adjusting method of the initial MCS configuration when executing the computer program.
In still another aspect, an embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the adjusting method for the initial MCS configuration.
One of the above technical solutions has the following advantages and beneficial effects:
calculating the demodulation probability information of all user equipment in each coverage level according to the HARQ information of all user equipment in each coverage level of a cell covered by the narrowband Internet of things system in a preset period, thereby adaptively adjusting the initial MCS value according to the comparison result of the calculated demodulation probability information and a set probability threshold; therefore, the problems of more user equipment retransmission, low system resource utilization rate and the like caused by unreasonable initial MCS configuration and poor overall performance of the system are effectively solved, the demodulation performance and the system resource utilization rate of the user equipment are improved, the scene applicability and the accuracy of the initial MCS configuration are greatly improved, and the overall performance of the system is greatly improved.
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FIG. 1 is a first flowchart illustrating a method for adjusting initial MCS configuration in one embodiment;
FIG. 2 is a second flowchart illustrating a method for adjusting initial MCS configuration in one embodiment;
FIG. 3 is a third flowchart illustrating a method for adjusting initial MCS configuration in one embodiment;
FIG. 4 is a fourth flowchart illustrating a method for adjusting initial MCS configuration in one embodiment;
fig. 5 is a block diagram of an adjusting apparatus for initial MCS configuration in one embodiment.
Detailed Description
The present invention will be described in further detail with reference to preferred embodiments and the accompanying drawings. It is to be understood that the following examples are illustrative only and are not intended to limit the present invention. 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.
With the explosive increase of mobile data traffic, massive equipment is connected into the network, and various new services and application scenes are continuously emerged, so that the rapid development of the internet of things technology is promoted. For the future, the fields of car networking, industrial control, smart home, mobile medical treatment, environmental monitoring and the like can promote explosive growth of the application scale of the internet of things technology, and hundreds of millions of devices are accessed into the network to realize 'everything interconnection', so that the mobile communication is realized indefinitely. The development of the internet of things technology corresponds to numerous application fields, technology is continuously updated, and the technical subdivision field is more diversified. In a conventional wireless internet of things access technology, the following technologies are mainly available: such as Zigbee technology, wifi technology, bluetooth technology, LoRa technology, SigFox technology, and NB-IOT technology; among them, NB-IOT systems (narrowband internet of things systems) corresponding to NB-IOT technologies are favored by the industry due to their low power consumption and wide coverage, and the pace of business applications is increasing. In the process of promoting commercial application of the NB-IOT system, there are many technical points which need to be solved urgently, for example, determination of an adaptive coding modulation strategy, that is, determination of an MCS; and the initial MCS configuration therein is important for the NB-IOT system.
In an NB-IOT system, the uplink and downlink bandwidths are 180kHz, frequency domain resources are less, and meanwhile, the coverage capability of the NB-IOT system needs to be improved through repeated transmission, so that the resource efficiency of the NB-IOT system is often lower. Considering the application scenario of the NB-IOT system, the data size of the user is small, so the conventional practice in the industry is to use the CP scheme for data transmission. In the process of implementing the technical scheme of the invention, the inventor finds that: in the CP scheme, data may be transmitted once and then the transmission is completed, and the initial MCS configuration used for data transmission will affect the performance of the NB-IOT system: in the conventional initial MCS configuration manner, if the initial MCS configuration is large, demodulation failure of the user equipment may be caused, and retransmission is large, which may seriously affect the performance of the NB-IOT system. If the initial MCS configuration is smaller, the coding efficiency is lower, and the resource utilization rate of the NB-IOT system is reduced. In addition, the initial MCS configuration should be considered to be adapted to different application scenarios. For the adverse effect caused by the initial MCS configuration, no effective solution exists in the conventional technology to solve the problem of poor overall performance of the NB-IOT system.
Referring to fig. 1, to solve the problems in the conventional technology, an embodiment of the present invention provides a method for adjusting initial MCS configuration, including the following steps:
s12, in a preset period, respectively calculating the demodulation probability information of each coverage grade according to the HARQ information of the user equipment corresponding to each coverage grade; wherein, the demodulation probability information comprises a demodulation correct rate and a demodulation error rate;
the preset period is a preset time period for collecting and processing data. The preset period may be determined according to the number of user equipments in the NB-IOT system (hereinafter, referred to as the system), a demodulation mechanism of the user equipment, experience of system operation and maintenance management, or a requirement of the system for processing data, and the like, and is, for example, 20 s. Each coverage level is a level of different Signal powers of the user equipment in the cell covered by the system, for example, a level determined by dividing the Signal Power received by the user equipment according to a Reference Signal Receiving Power (RSRP) threshold configured by the base station. HARQ (Hybrid Automatic Repeat Request) information is data information retransmitted by the ue, and may include information such as ACK, NACK, and MISS of newly transmitted data of each ue. The demodulation probability information is used to reflect the signal demodulation status of the ue at each coverage level, and may be information such as the demodulation accuracy or demodulation error rate of all ues at each coverage level.
Specifically, when the preset period is finished, the adjusting device for initial MCS configuration, such as a macro base station, a micro base station, a pico base station, or other system monitoring devices, may calculate the demodulation probability information of all the user equipments in each coverage level according to the HARQ information of all the user equipments in each coverage level in the preset period, that is, obtain the demodulation probability information of each coverage level. For example, there are 10 ues under coverage level 1, the adjusting device configured by the initial MCS may calculate a demodulation correct rate or a demodulation error rate according to the HARQ information of the 10 ues, to obtain a demodulation correct rate or a demodulation error rate corresponding to the 10 ues, that is, to obtain the demodulation probability information of coverage level 1.
And S14, adjusting the initial MCS value of the narrowband Internet of things system according to the comparison result of the demodulation probability information of each coverage level and the set probability threshold.
The set probability threshold is a preset probability threshold value, and the set probability threshold may be a demodulation correct rate threshold or a demodulation error rate threshold which is determined according to historical operation and maintenance data, debugging and testing experience and the like of the system and ensures data transmission effectiveness. The comparison result is the comparison and statistics result of the demodulation probability information and the set probability threshold, and may be, for example, statistics of the number of times that the demodulation accuracy is greater than or less than the set probability threshold. An initial MCS configuration of a system is configured as a base station or user equipment, and in a continuous data transmission process, an MCS value configured when newly transmitted data is transmitted for the first time, that is, the initial MCS configuration can be configured in advance by the base station; after that, at the end of each preset period, the adjusting device configured by the initial MCS may adjust the initial MCS value according to the HARQ information of all the ues at each coverage level.
Specifically, the adjusting device of the initial MCS configuration may perform adaptive adjustment processing on the initial MCS configuration in the system operation process. After the adjusting device configured by the initial MCS calculates the demodulation probability information at each coverage level, the adjusting device may adjust the initial MCS value of the system according to the comparison result between the demodulation probability information at each coverage level and the set probability threshold. The initial MCS value of the system is adjusted in a self-adaptive manner according to the HARQ information of each user equipment of each coverage level, so that the problems of more data retransmission of the user equipment and low utilization rate of system resources caused by unreasonable initial MCS of fixed configuration are effectively solved, the demodulation performance of the user equipment and the resource utilization rate of the system are improved, and the overall performance of the system is greatly improved.
Referring to fig. 2, in one embodiment, the set probability threshold comprises a maximum demodulation accuracy threshold. Specifically, step S14 can be implemented by step S142 as follows:
and S142, if the demodulation accuracy of any coverage level is continuously greater than the maximum demodulation accuracy threshold for a first set time, adding a set up step length to the initial MCS value of the coverage level.
The maximum demodulation accuracy threshold is a preset maximum demodulation accuracy, and may be set according to a performance index of a system or a demodulation efficiency index of user equipment, and the minimum demodulation accuracy threshold, the maximum demodulation error rate threshold, and the minimum demodulation error rate threshold in this specification are understood in the same way. The first set number of times is a positive integer, and may be 1 time, 2 times, or other times, and the specific value may be determined according to a specific application scenario, an application condition, and an uplink or downlink service type of the system. Setting an up step (AddMcsStep) as a positive integer, where the specific value may be 1, or 2, or other positive integer values, and the specific value may be selected according to a signal environment where the ue is located, channel quality, or MCS (MCS value of a channel, different from the initial MCS value) jitter condition, or the like; for example, when the MCS jitter is large, a larger value may be selected for the set up step size, and when the MCS jitter is small, a smaller value may be selected for the set up step size.
Specifically, when the demodulation accuracy of a certain coverage level is continuously greater than the maximum demodulation accuracy threshold for a first set number of times, the initial MCS value of the coverage level is automatically added with a set up step length. At the beginning of the next preset period, all the ues in the coverage level will use the adjusted initial MCS value for data transmission. For other coverage levels, it can be understood in the same manner that the initial MCS value is adjusted up when the above conditions are satisfied. Therefore, through the statistics and the self-adaptive adjustment of the initial MCS value, the problems of more data retransmission of the user equipment and low utilization rate of system resources caused by unreasonable initial MCS value of the fixed configuration are effectively solved, the demodulation performance of the user equipment and the resource utilization rate of the system are improved, and the scene applicability and the accuracy of the initial MCS configuration are effectively enhanced.
In one embodiment, the demodulation accuracy is a ratio of the number of times of ACK information fed back by each ue in the same coverage level to a sum of the number of times of ACK information, NACK information, and MISS information:
Figure BDA0001669367420000071
in the above equation, demvaliditiratio represents a demodulation accuracy. The ACK indicates the number of times each user equipment feeds back ACK information in the same coverage level. NACK indicates the number of times each user equipment feeds back NACK information at the same coverage level. The MISS indicates the number of times each user equipment feeds back the MISS at the same coverage level.
It can be understood that the demodulation accuracy is the probability that the user equipment under one coverage level is correct for the signal demodulation. That is, the demodulation accuracy may correspond to a coverage level, e.g., one coverage level corresponds to one demodulation accuracy. Specifically, the demodulation accuracy of a coverage level is a ratio of the number of times of ACK information fed back by each ue to the sum of the number of times of ACK information, NACK information, and MISS information in the coverage level. For example, when the number of times of ACK information fed back by each ue is 2900 times and the total number of times of ACK information, NACK information, and MISS information fed back is 3000 times, the demodulation accuracy of the coverage level is 96.7%. The demodulation performance condition of the user equipment under the coverage level can be effectively reflected through the demodulation accuracy, so that whether the initial MCS value configuration of the coverage level is reasonable or not is reflected.
In one embodiment, setting the probability threshold further comprises setting a minimum demodulation error rate threshold. Step S14 may be implemented by the following steps:
if the demodulation error rate of any coverage level is continuously less than the minimum demodulation error rate threshold for a second set time, the initial MCS value of the coverage level is added with a set up step length.
The second set number is a positive integer, and may be the same as or different from the first set number, for example, 1 time, 2 times, or other numbers, and the specific value may be determined according to a specific application scenario, an application condition, and an uplink or downlink traffic amount of the system.
Specifically, when the number of times that the demodulation error rate of a certain coverage level is continuously smaller than the minimum demodulation error rate threshold reaches a second set number of times, the initial MCS value of the coverage level is automatically added with a set up step length. At the beginning of the next preset period, all the ues in the coverage level will use the adjusted initial MCS value for data transmission. That is, the adaptive adjustment of the initial MCS value may be performed by calculating the demodulation error rate of each coverage level according to HARQ information of all user equipments under each coverage level, and adaptively adjusting the initial MCS value of each coverage level according to a comparison result between the demodulation error rate of each coverage level and the minimum demodulation error rate threshold.
Therefore, through the adaptive adjustment of the initial MCS value, the demodulation performance of the user equipment and the resource utilization rate of the system can be improved, and the scene applicability and accuracy of the initial MCS configuration can be effectively enhanced.
In one embodiment, the demodulation error rate is a ratio of the number of times of NACK information and MISS information fed back by each of the ue under the same coverage level to a sum of the number of times of ACK information, NACK information, and MISS information:
Figure BDA0001669367420000091
where DemErrorRatio in the above equation represents a demodulation error rate. The ACK indicates the number of times each user equipment feeds back ACK information in the same coverage level. NACK indicates the number of times each user equipment feeds back NACK information at the same coverage level. The MISS indicates the number of times each user equipment feeds back the MISS at the same coverage level.
It can be understood that the demodulation error rate is the probability of a signal demodulation error by a user equipment under one coverage level. That is, the demodulation error rate may also correspond to a coverage level, e.g., one coverage level corresponds to one demodulation error rate. The demodulation error rate of a coverage level is the ratio of the number of times of NACK information and MISS information fed back by each UE to the sum of the number of times of ACK information, NACK information and MISS information at the coverage level. For example, if the number of times of NACK information and MISS information fed back by each user equipment is 100 times and the total number of times of ACK information, NACK information, and MISS information fed back is 3000 times, the demodulation error rate of the coverage level is 3.3%. The demodulation error rate can also effectively reflect the demodulation performance condition of the user equipment under the coverage level, thereby reflecting whether the initial MCS value configuration of the coverage level is reasonable or not.
In one embodiment, for the above embodiment of adjusting the initial MCS value, the method for adjusting the initial MCS configuration may further include the following step S15:
s15, if the initial MCS value reaches the preset upper modulation threshold, the initial MCS value of the coverage level is maintained.
Wherein, presetUp-scaling threshold (i.e. InitCvMCS)max) The maximum allowable value of the adjustment in the direction of increasing the value is the preset initial MCS value, and the specific value can be set according to the actual application scene of the system and the adjustment and test experience of the system.
Specifically, in the process of implementing the adaptive adjustment of the initial MCS value, when the initial MCS value of the corresponding coverage level has reached the preset upper modulation value threshold, for example, the initial MCS value has reached the preset upper modulation value threshold of the coverage level, the initial MCS value of the preset period is maintained unchanged. That is, during the operation of the system, the initial MCS value in a certain preset period has reached the preset upper threshold, and at the beginning of the next preset period, the initial MCS value will continue to be maintained at the preset upper threshold. Therefore, the problem that the data transmission efficiency of user equipment or a system is seriously reduced due to the overshoot of the initial MCS value can be effectively avoided by setting the preset upper calling value threshold, and the initial MCS value is kept to be adapted to the current application scene to the maximum extent.
Referring to fig. 3, in one embodiment, the set probability threshold further includes a minimum demodulation accuracy threshold. Step S14 may be specifically realized by step S144 as follows:
and S144, if the demodulation accuracy of any one coverage level is continuously less than the minimum demodulation accuracy threshold for a third set time, subtracting a set down step size from the initial MCS value of the coverage level.
Wherein the third set number is a positive integer. The third set number may be the same value as the first set number and/or the second set number, or may be a different value; for example, the number of times may be 1, 2, or other times, and the specific value may also be determined according to the specific application scenario, application condition, and the number of uplink or downlink services of the system. The down step (DecMcsStep) is set as the adjustment step when the initial MCS value is adjusted to the direction of the small value, and the specific determination method can be understood in the same way as the setting of the up step.
Specifically, when the demodulation accuracy of a certain coverage level is continuously less than the minimum demodulation accuracy threshold for a third set number of times, the initial MCS value of the coverage level is automatically reduced by a set down step. At the beginning of the next preset period, all the ues in the coverage level will use the adjusted initial MCS value for data transmission. That is, the adaptive adjustment of the initial MCS value may be performed by calculating the demodulation accuracy of each coverage level according to HARQ information of all user equipments under each coverage level, and adaptively adjusting the initial MCS value of each coverage level according to a comparison result between the demodulation accuracy of each coverage level and the minimum demodulation error accuracy threshold.
Thus, when the demodulation accuracy of any coverage level meets the requirement that the number of times continuously smaller than the minimum demodulation accuracy threshold reaches the third set number of times, the initial MCS value can be automatically reduced by a set down step length to reduce the initial MCS value, so as to adapt to the environment where the user equipment of the coverage level is located. For other coverage levels, it can be understood in the same manner that the initial MCS value is adjusted downward when the above conditions are satisfied. Therefore, through the statistics and the adaptive adjustment of the initial MCS value, the problems of more data retransmission of the user equipment and low utilization rate of system resources caused by unreasonable initial MCS of the fixed configuration can be effectively solved, the demodulation performance of the user equipment and the resource utilization rate of the system are improved, and the scene applicability and the accuracy of the initial MCS configuration are effectively enhanced.
In one embodiment, the set probability threshold further includes a maximum demodulation error rate threshold. Step S14 may be specifically implemented by the following steps:
if the demodulation error rate of any coverage level is continuously greater than the maximum demodulation error rate threshold for a fourth set number of times, the initial MCS value of the coverage level is reduced by a set down step.
Wherein the fourth set number is a positive integer. The fourth set number of times may be the same value as any one of the first set number of times, the second set number of times, and the third set number of times, or two of them may be the same value, or three may be all the same values, or may be different values; for example, the number of times may be 1, 2, or other times, and the specific value may also be determined according to the specific application scenario, application condition, and the number of uplink or downlink services of the system.
Specifically, the adaptive adjustment of the initial MCS values of the coverage levels may also be implemented to adjust the initial MCS values downward according to a comparison result between the demodulation error rate and the maximum demodulation error rate threshold, so as to adapt to the environment where the user equipment of each coverage level is located, improve the demodulation performance of the user equipment and the resource utilization rate of the system, and enhance the scene applicability and accuracy of the initial MCS configuration.
In one embodiment, for the above embodiment of adjusting the initial MCS value, the method for adjusting the initial MCS configuration may further include the following step S17:
and S17, if the initial MCS value reaches the preset down-regulation threshold, maintaining the initial MCS value of the coverage level.
Wherein, a down-regulation threshold (i.e. InitCvMCS) is presetmin) The minimum allowable value of the adjustment in the direction of reducing the value is the preset initial MCS value, and the specific value can be set according to the actual application scene of the system and the adjustment and test experience of the system. It can be understood that the adjustment of the initial MCS value may be set with a preset value range [ InitCvMCS ] according to the design requirement of the systemmin，InitCvMCSmax]Therefore, the initial MCS value can be adjusted to adapt to the current application scenario to the maximum extent, and meanwhile, the comprehensive performance of the system is prevented from being reduced.
Specifically, in the process of implementing adaptive adjustment of the initial MCS value in each of the above embodiments, when the initial MCS value of the corresponding coverage level has reached the preset down-regulation threshold, for example, the initial MCS value has reached the preset down-regulation threshold of the coverage level, the initial MCS value of the preset period is maintained unchanged. That is, in the system operation process, the initial MCS value in a certain preset period has reached the preset down-regulation threshold, and at the beginning of the next preset period, the initial MCS value will continue to be maintained at the preset down-regulation threshold. Therefore, the problem that the data transmission efficiency of user equipment or a system is reduced due to the fact that the initial MCS value is adjusted excessively can be effectively solved by presetting the adjustment value threshold, and the initial MCS value is kept to be adapted to the current application scene to the maximum extent.
In one embodiment, the step S14 may specifically include the following steps:
and if the demodulation correct rate of any coverage level is greater than the minimum demodulation correct rate threshold and less than the maximum demodulation correct rate threshold, maintaining the initial MCS value of the coverage level.
Specifically, in the adaptive adjustment process of the initial MCS value in each of the above embodiments, if the demodulation accuracy of any coverage level satisfies the following condition: when the demodulation accuracy is greater than the minimum demodulation accuracy threshold and less than the maximum demodulation accuracy threshold, maintaining the initial MCS value of the coverage level unchanged when the current preset period is ended; i.e., at the beginning of the next preset period, the current initial MCS value (i.e., the initial MCS value of the previous preset period) will continue to be used at the coverage level. When the next preset period is over, the above processing steps are performed again, that is, the adjustment processing of a new preset period is started. Thus, through the above processing, when the demodulation accuracy is not continuously greater than the maximum demodulation accuracy threshold or not continuously less than the minimum demodulation accuracy threshold, the current initial MCS value of the coverage level is maintained unchanged, so that each ue in the coverage level in the next preset period can maintain higher demodulation efficiency, and ensure higher utilization rate of system resources.
In one embodiment, the step S14 may specifically include the following steps:
if the demodulation error rate of any coverage level is less than the maximum demodulation error rate threshold and greater than the minimum demodulation error rate threshold, the initial MCS value of the coverage level is maintained.
It can be understood that, in the process of implementing adaptive adjustment of the initial MCS value in each of the above embodiments, when the demodulation error rate is used for comparison and statistics, the initial MCS value of any coverage level may also be maintained when the demodulation error rate of the coverage level is smaller than the maximum demodulation error rate threshold and larger than the minimum demodulation error rate threshold, so that the current initial MCS value will still be continuously used at the coverage level at the beginning of the next preset period, so that each ue at the coverage level in the next preset period may maintain higher demodulation efficiency, and ensure higher utilization rate of system resources.
It can be understood that, at the end of each preset period, the adjusting device for initial MCS configuration will adjust the initial MCS value of each coverage level to increase, decrease or maintain unchanged according to the comparison result between the demodulation accuracy (or demodulation error rate) of each coverage level and the set probability threshold, and the comparison result between the demodulation accuracy and the set upper modulation threshold and the set lower modulation threshold. Therefore, the initial MCS value of each coverage level can be adaptively adjusted in each preset period, so that the initial MCS value of each coverage level can be adapted to the channel environment where the initial MCS value is located as much as possible, the problems that the fixed initial MCS value is unreasonable in configuration and has adverse effects on the demodulation efficiency of the user equipment and the resource utilization rate of the system are effectively solved, the demodulation performance of each user equipment and the resource utilization rate of the system are improved, the scene applicability and the accuracy of the initial MCS configuration are effectively enhanced, and the optimization difficulty of the system network is reduced.
Referring to fig. 4, in one embodiment, before the step S12, a step S11 may be further included:
s11, respectively collecting HARQ information of each user equipment corresponding to each coverage grade in the target area in a preset period; the HARQ information includes ACK information, NACK information, and MISS information of newly transmitted data of each ue.
It will be appreciated that the target area is the coverage area in which the system operates, for example individual residential cells. The HARQ information may include HARQ information of newly transmitted data with an initial MCS value configured for the first time when the user equipment starts to operate using the system. The newly transmitted data may refer to data that is transmitted for the first time by using the initial MCS value without receiving any HARQ information by the system, and does not contain retransmitted data; or, the HARQ information may also include HARQ information of newly transmitted data using the adjusted initial MCS value after the ue has undergone the preset period.
Specifically, in a preset period, the adjusting device configured by the initial MCS may collect, for all the user equipments in the target area, HARQ information fed back by the user equipment according to each coverage level. For example, coverage level 1 has 100 ues, and the adjusting device for initial MCS configuration may record HARQ information fed back by the 100 ues; coverage level 2 has 90 ues, and the adjusting device of the initial MCS configuration can record HARQ information fed back by the 90 ues. So that the HARQ information of each of the coverage level 1 and the coverage level 2 can be obtained at the end of the preset period, so as to facilitate the subsequent calculation, statistics and adjustment processes. Therefore, the long-term demodulation efficiency of each user equipment in the operation process of the system can be effectively reflected by adding the preset period, so that the self-adaptive adjustment accuracy of the initial MCS value is improved, and the applicability of the initial MCS value is enhanced.
By the method for adjusting the initial MCS value, the problems of more data retransmission of the user equipment and low utilization rate of system resources caused by unreasonable initial MCS of fixed configuration are effectively solved, the demodulation performance of the user equipment and the resource utilization rate of the system are improved, and the scene applicability and the accuracy of initial MCS configuration are effectively enhanced. In addition, the initial MCS value of each coverage level is self-adaptively adjusted according to the HARQ information of the user equipment of each coverage level in real time, the self-optimization capability of the system is enhanced, and the network optimization difficulty of the system is reduced.
In one embodiment, to make the above-mentioned adjustment method of the initial MCS value easier to understand, the following example one is provided: taking the base station as an example of the above adjusting device for initial MCS configuration, in a cell covered by the system, the RSRP (Reference Signal Receiving Power) threshold configured by the base station includes RSRP1 ═ 105dBm, RSRP2 ═ 115dBm, and then the coverage levels can be divided into three, where each coverage level is CV0(RSRP > -105dBm), CV1(RSRP > -115dBm and RSRP < - > 105dBm) and CV2(RSRP < = -115 dBm). The base station can record HARQ information fed back by all user equipments under coverage levels CV0, CV1 and CV2, and the HARQ information of all user equipments under the same coverage level is processed uniformly. For example:
number of ACK messages for CV 0: 2900. number of NACK information and MISS information: 100, total number of times of ACK information, NACK information, and MISS information: 3000.
number of ACK messages for CV 1: 1800. number of NACK information and MISS information: 200, total number of times of ACK information, NACK information, and MISS information: 2000.
number of ACK messages for CV 2: 500. number of NACK information and MISS information: 500, total number of times of ACK information, NACK information, and MISS information: 1000.
further, the base station may calculate demodulation probability information of each coverage class according to HARQ information of each coverage class CV0, CV1 and CV2, for example:
demodulation accuracy of CV 0: 96.7 percent; or demodulation error rate: 3.3 percent.
Demodulation accuracy of CV 1: 90 percent; or demodulation error rate: 10 percent.
Demodulation accuracy of CV 2: 50 percent; or demodulation error rate: 50 percent.
Furthermore, the base station may determine whether the demodulation accuracy of all the ues under a certain coverage level is continuously greater than a maximum demodulation accuracy threshold (demvaliditityratodmax) N1 times, or whether the demodulation error rate is continuously less than a minimum demodulation error rate threshold (demerrorrationthmin) N2 times.
If the demodulation accuracy under the coverage level is continuously greater than the maximum demodulation accuracy threshold for N1 times, or the demodulation error rate is continuously less than the minimum demodulation error threshold for N2 times, the initial MCS value of the coverage level is adjusted to be added with a set up step length and not to exceed the preset value range [ InitCvMCS ] of the initial MCS valuemin， InitCvMCSmax]. Other coverage level adjustments are understood by the same reason.
If the demodulation correct rate under the coverage level is continuously less than the minimum demodulation correct rate threshold (DemValidityRatiodMin) for N3 times or the demodulation error rate is continuously greater than the maximum demodulation error rate threshold (DemErrorRatiodMax) for N4 times, adjusting the initial MCS value of the coverage level to subtract a set down step (DecMCsStep) and not exceeding the preset value range [ InitCvMCS ] of the initial MCS valuemin， InitCvMCSmax]. Other coverage level adjustments are understood by the same reason.
If the demodulation correct rate under the coverage level is greater than the minimum demodulation correct rate threshold and less than the maximum demodulation correct rate threshold, or the demodulation error rate is less than the maximum demodulation error rate threshold and greater than the minimum demodulation error rate threshold, keeping the initial MCS value of the coverage level unchanged, and waiting for the adjustment of the next preset period.
Example two: taking the base station as the above-mentioned adjusting device for initial MCS configuration as an example, the demodulation correct rate or demodulation error rate of the above-mentioned example one is used. There are three coverage levels in the cell, and the initial MCS value of each coverage level is: CV 0-9, CV 1-7, CV 2-4; presetting up-regulation and down-regulation value thresholds for initial MCS values of each coverage level: CV0 ═ 7, 10], CV1 ═ 5, 9, and CV3 ═ 3, 7.
Maximum demodulation accuracy threshold: 95%, minimum demodulation accuracy threshold: 75 percent; maximum demodulation error rate threshold: 25%, minimum demodulation error rate threshold: 5 percent. The values of the set up step length and the set down step length are both 1. The values of the set times N1, N2, N3 and N4 are all 1.
Then, according to the demodulation correct rate or the demodulation error rate and the threshold, the base station may adjust the initial MCS value of each coverage level as follows:
the initial MCS value of CV0 is increased by 1, i.e., adjusted to 10; the initial MCS value of CV1 remains unchanged, i.e., remains 7; the initial MCS value of CV2 is reduced by 1, i.e., adjusted to 3.
If the HARQ information of three coverage levels recorded in the next preset period is still the value of the example one, the base station may adjust the initial MCS value of each coverage level according to the demodulation correct rate or the demodulation error rate and the threshold as follows:
the initial MCS value of CV0 has reached the preset upper tune value threshold and thus remains at 10; the initial MCS value of CV1 remains unchanged, remains 7; the initial MCS value of CV2 has reached the preset turndown threshold and thus remains at 3. Therefore, the initial MCS value of each coverage level is adaptively adjusted, so that the demodulation performance of the user equipment and the resource utilization rate of the system can be effectively improved, and the scene applicability and the accuracy of the initial MCS configuration are enhanced.
It should be understood that, although the steps in the flowcharts of fig. 1 to 4 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 1-4 may include multiple sub-steps or phases that are not necessarily performed at the same time, but may be performed at different times; the order of execution of the sub-steps or stages is not necessarily sequential, and may be performed in turn or alternatingly with other steps or at least a portion of sub-steps or stages of other steps.
Referring to fig. 5, there is also provided an apparatus 100 for adjusting initial MCS configuration, including: a probability calculation module 12 and a statistical adjustment module 14. The probability calculation module 12 is configured to calculate demodulation probability information of each coverage level according to HARQ information of each user equipment corresponding to each coverage level in a preset period. The statistic adjusting module 14 is configured to adjust an initial MCS value of the narrowband internet of things system according to a comparison result between the demodulation probability information of each coverage level and a set probability threshold.
By the adjusting device 100 for the initial MCS value, the problems of more data retransmission of the user equipment and low utilization rate of system resources caused by unreasonable initial MCS of fixed configuration are effectively solved, the demodulation performance of the user equipment and the resource utilization rate of the system are improved, the scene applicability and accuracy of initial MCS configuration are effectively enhanced, and the overall performance of the system is greatly improved. In addition, the initial MCS value of each coverage level is self-adaptively adjusted according to the HARQ information of the user equipment of each coverage level in real time, and the self-optimization capability of the system is enhanced, so that the network optimization difficulty of the system is reduced.
In one embodiment, the modules of the initial MCS value adjusting apparatus 100 may also be used to implement other steps of the initial MCS value adjusting method in the above embodiments.
In one embodiment, a computer device is also provided. The computer device may be, for example, a general computer or may be a server. The computer device includes a memory and a processor. The memory has stored thereon a computer program operable on the processor. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The computer device may comprise a network interface for communicating with an external interactive terminal via a network connection.
When the processor executes the computer program on the memory, the following steps may be performed: calculating demodulation probability information of each user equipment according to HARQ information of each user equipment corresponding to each coverage grade in a preset period; and adjusting the initial MCS value of the system according to the comparison result of the demodulation probability information of each coverage level and the set probability threshold.
In one embodiment, the processor of the aforementioned computer device, when executing the computer program on the memory, may further implement the sub-steps of the adjusting method of the initial MCS configuration in the above embodiments.
Embodiments of the present invention may be implemented by a program executed by a data processing apparatus such as a computer. Obviously, the programs constitute the present invention. Further, the program stored in one storage medium is generally executed by directly reading the program out of the storage medium or by installing or copying the program into a storage device (such as a hard disk and or a memory) of the data processing device. Such a storage medium therefore also constitutes the present invention. The storage medium may use any type of recording means, such as a paper storage medium (e.g., paper tape, etc.), a magnetic storage medium (e.g., a flexible disk, a hard disk, a flash memory, etc.), an optical storage medium (e.g., a CD-ROM, etc.), a magneto-optical storage medium (e.g., an MO, etc.), and the like.
Thus, in one of the embodiments, a computer-readable storage medium is also disclosed, in which a computer program is stored which, when executed by a processor, causes the process to perform the steps of: calculating demodulation probability information of each user equipment according to HARQ information of each user equipment corresponding to each coverage grade in a preset period; and adjusting the initial MCS value of the system according to the comparison result of the demodulation probability information of each coverage level and the set probability threshold.
In one embodiment, when being executed by a processor, the computer program may be further used to implement any embodiment of the adjusting method for initial MCS configuration in the above embodiments of the present invention.
It should be noted that, for the sake of simplicity, the foregoing method embodiments are described as a series of acts or combinations, but those skilled in the art should understand that the present invention is not limited by the described order of acts, as some steps may be performed in other orders or simultaneously according to the present invention. It should be further noted that, for the convenience of description, only some but not all of the relevant aspects of the present invention are shown in the drawings.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (12)

1. A method for adjusting initial MCS configuration, comprising the steps of:
in a preset period, respectively calculating the demodulation probability information of each coverage grade according to the HARQ information of the user equipment corresponding to each coverage grade; wherein the demodulation probability information comprises a demodulation correct rate and a demodulation error rate;
and adjusting the initial MCS value of each coverage grade in the narrowband Internet of things system according to the comparison result of the demodulation probability information of each coverage grade and a set probability threshold.
2. The method of claim 1, wherein the predetermined probability threshold comprises a maximum demodulation accuracy threshold and a minimum demodulation error rate threshold;
the step of adjusting the initial MCS value of the narrowband Internet of things system according to the comparison result of the demodulation probability information of each coverage level and the set probability threshold comprises the following steps:
if the demodulation accuracy of any one of the coverage levels is continuously greater than the maximum demodulation accuracy threshold for a first set number of times, or if the demodulation error rate of any one of the coverage levels is continuously less than the minimum demodulation error rate threshold for a second set number of times, adding a set up step length to the initial MCS value of the coverage level.
3. The method of claim 2, wherein the predetermined probability threshold comprises a minimum demodulation accuracy threshold and a maximum demodulation error rate threshold;
the step of adjusting the initial MCS value of the narrowband Internet of things system according to the comparison result of the demodulation probability information of each coverage level and the set probability threshold comprises the following steps:
if the demodulation accuracy of any one of the coverage levels is continuously less than the minimum demodulation accuracy threshold for a third set number of times, or if the demodulation error rate of any one of the coverage levels is continuously greater than the maximum demodulation error rate threshold for a fourth set number of times, the initial MCS value of the coverage level is decreased by a set down step.
4. The method of adjusting initial MCS configuration according to claim 2, further comprising:
and if the initial MCS value reaches a preset upper calling value threshold, maintaining the initial MCS value of the coverage level.
5. The method of adjusting an initial MCS configuration according to claim 3, wherein the method further comprises:
and if the initial MCS value reaches a preset down-regulation value threshold, maintaining the initial MCS value of the coverage level.
6. The method for adjusting initial MCS configuration according to claim 3 or 5, wherein the step of adjusting the initial MCS value of the narrowband internet of things system according to the comparison result between the demodulation probability information of each coverage level and the set probability threshold further includes:
if the demodulation correct rate of any of the coverage levels is greater than the minimum demodulation correct rate threshold and less than the maximum demodulation correct rate threshold, or if the demodulation error rate of any of the coverage levels is less than the maximum demodulation error rate threshold and greater than the minimum demodulation error rate threshold, maintaining the initial MCS value of the coverage level.
7. The method of claim 1, wherein before the step of calculating the demodulation probability information of each coverage level according to the HARQ information of the ue corresponding to each coverage level in a preset period, the method further comprises:
in the preset period, respectively acquiring the HARQ information of each user equipment corresponding to each coverage grade in a target area; the HARQ information includes ACK information, NACK information, and MISS information of newly transmitted data of each of the user equipments.
8. The method of claim 7, wherein the demodulation accuracy is a ratio of the number of ACK information feedbacks from each UE at the same coverage level to the sum of the number of ACK information, NACK information and MISS information.
9. The method of claim 7, wherein the demodulation error rate is a ratio of the number of times of NACK information and MISS information fed back by each UE at the same coverage level to the sum of the number of times of ACK information, NACK information and MISS information.
10. An apparatus for adjusting an initial MCS configuration, comprising:
the probability calculation module is used for calculating the demodulation probability information of each coverage grade according to the HARQ information of the user equipment corresponding to each coverage grade in a preset period; wherein the demodulation probability information comprises a demodulation correct rate and a demodulation error rate;
and the statistic adjusting module is used for adjusting the initial MCS value of each coverage grade in the narrowband Internet of things system according to the comparison result of the demodulation probability information of each coverage grade and a set probability threshold.
11. A computer device comprising a memory and a processor, the memory having stored thereon a computer program operable on the processor, the processor when executing the computer program implementing the steps of the method of adjusting an initial MCS configuration according to any one of claims 1 to 9.
12. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of adjusting an initial MCS configuration according to any one of claims 1 to 9.
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