CN111436052B - Coverage optimization method and base station in wireless communication system - Google Patents

Abstract

The embodiment of the invention provides a coverage optimization method and a base station in a wireless communication system. The method comprises the steps of periodically obtaining an MCS value of each terminal according to a preset period; if the MCS value of the terminal continuously meets the preset down-regulation condition and the cycle number reaches the preset first cycle threshold value, the number of sub-bands of the terminal is reduced; wherein, the down-regulating condition is specifically: the MCS value is smaller than or equal to the preset first MCS threshold value, and the embodiment of the invention monitors the periodicity of the MCS value of each terminal through the base station, and when the periodicity of the MCS value of the terminal continuously meets the preset down-regulation condition reaches the preset first periodicity threshold value, the number of the sub-bands of the terminal is adjusted down, so that the channel condition and the transmission efficiency of the terminal and the base station are improved, and the coverage area of the terminal is enlarged under the condition that the service transmission is not influenced.

Description

Coverage optimization method and base station in a wireless communication system

technical field

Embodiments of the present invention relate to the technical field of wireless communication, and in particular, to a coverage optimization method and a base station in a wireless communication system.

Background technique

At present, the 230MHz frequency band is mainly used in data transmission stations to undertake remote data collection work. Because the provided rate is very low, it can only be used for some simple communication applications, and cannot meet the growing business needs of smart grids and sensor networks. According to the future planning of the State Grid, it is required to find a new broadband communication technology to meet the business needs of its distribution network automation, load management, electricity consumption information collection, smart grid user services, emergency repairs, and video surveillance in special areas. The 230MHz frequency band private network wireless communication system based on TD-LTE (Time Division-Long Term Evolution) technology provides a better solution for the above needs, forming a new generation of low power consumption, high spectrum utilization, and high reliability. multi-service communication system. It can meet the business requirements of the power load monitoring system to the greatest extent, and at the same time provide a solid technical accumulation and application demonstration for the next-generation network planning of the State Grid. Optimize the network structure and improve terminal capacity and real-time performance of services.

In view of the above requirements, in the 230MHz frequency band broadband access system based on TD-LTE technology, the system bandwidth is divided into multiple continuous or discontinuous sub-bands. In order to reduce cost and implementation complexity, user equipment (User Equipment, UE) can work in single subband mode, that is, the receiver bandwidth of UE does not have to be the entire system bandwidth, and UE can choose to work on all or part of the subbands according to different hardware capabilities , the UE with the weakest capability only works on a single subband. In this way, the requirement on the bandwidth of the UE receiver is reduced, and the requirement on the hardware capability of the system is also reduced.

In a 230MHz private network wireless communication system, the total uplink transmission power of the UE is constant. If the total power remains unchanged, the smaller the power allocated to each subband is in the case of long distances, then the signal received by the base station side will be smaller. The smaller is, the worse the signal demodulation will be, resulting in degraded system performance. For mobility services such as mobile inspection services, mobile voice, and mobile video services, the efficiency of data transmission during the movement cannot be effectively guaranteed.

Contents of the invention

Embodiments of the present invention provide a coverage optimization method and a base station in a wireless communication system, which are used to solve the problem of insufficient data transmission efficiency in the prior art for mobile inspection services, mobile voice services, mobile video services, and other mobile services. The problem of getting effective guarantees.

In a first aspect, an embodiment of the present invention provides a coverage optimization method in a wireless communication system, including:

According to the preset cycle, regularly obtain the modulation and coding strategy value of each terminal;

If the number of cycles in which the MCS value of the terminal continuously meets the preset down-regulation condition reaches the preset first cycle threshold, then reduce the number of sub-bands of the terminal; wherein, the down-regulation condition is specifically: the MCS value is smaller than equal to the preset first MCS threshold.

In a second aspect, an embodiment of the present invention provides a base station for coverage optimization in a wireless communication system, including:

A monitoring module, configured to periodically obtain the MCS value of each terminal according to a preset period;

A scheduling module, configured to reduce the number of sub-bands of the terminal if the number of periods in which the MCS value of the terminal continuously meets the preset down-regulation condition reaches a preset first period threshold; wherein the down-regulation condition is specifically: The MCS value is less than or equal to the preset first MCS threshold.

In a third aspect, an embodiment of the present invention also provides an electronic device, including:

processor, memory, communication interface, and communication bus; wherein,

The processor, the memory, and the communication interface complete mutual communication through the communication bus;

The communication interface is used for information transmission between communication devices of the electronic device;

The memory stores computer program instructions executable by the processor, and the processor calls the program instructions to perform the following methods:

According to the preset cycle, regularly obtain the modulation and coding strategy value of each terminal;

If the number of cycles in which the MCS value of the terminal continuously meets the preset down-regulation condition reaches the preset first cycle threshold, then reduce the number of sub-bands of the terminal; wherein, the down-regulation condition is specifically: the MCS value is smaller than equal to the preset first MCS threshold.

In a fourth aspect, the embodiment of the present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the following method is implemented:

According to the preset cycle, regularly obtain the modulation and coding strategy value of each terminal;

If the number of cycles in which the MCS value of the terminal continuously meets the preset down-regulation condition reaches the preset first cycle threshold, then reduce the number of sub-bands of the terminal; wherein, the down-regulation condition is specifically: the MCS value is smaller than equal to the preset first MCS threshold.

The coverage optimization method and the base station in the wireless communication system provided by the embodiments of the present invention, through the periodic monitoring of the MCS value of each terminal by the base station, the number of cycles when the MCS value of the terminal continuously meets the preset downward adjustment condition reaches the preset When the first cycle threshold is set, the number of subbands of the terminal is lowered, thereby improving the channel condition and transmission efficiency between the terminal and the base station, and expanding the coverage of the terminal without affecting service transmission.

Description of drawings

FIG. 1 is a flowchart of a coverage optimization method in a wireless communication system according to an embodiment of the present invention;

FIG. 2 is a flowchart of a coverage optimization method in another wireless communication system according to an embodiment of the present invention;

FIG. 3 is a structural diagram of a base station used for coverage optimization in a wireless communication system according to an embodiment of the present invention;

Fig. 4 illustrates a schematic diagram of a physical structure of an electronic device.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

FIG. 1 is a flowchart of a coverage optimization method in a wireless communication system according to an embodiment of the present invention. As shown in FIG. 1, the method includes:

Step S01 , according to a preset period, periodically acquire a modulation and coding scheme (Modulation and Coding Scheme, MCS) value of each terminal.

The base station monitors each terminal within the coverage area in real time, and obtains the MCS value corresponding to each terminal according to the monitored monitoring data of each terminal according to the preset cycle, for example, the preset re-authorization cycle interval .

Step S02, if the number of cycles in which the MCS value of the terminal continuously meets the preset down-regulation condition reaches the preset first cycle threshold, then reduce the number of sub-bands of the terminal; wherein, the down-regulation condition is specifically: the MCS The value is less than or equal to the preset first MCS threshold.

For a mobile terminal, when the terminal is far away from the base station, since the signal received by the base station side will become smaller and smaller, the MCS value of the terminal monitored by the base station will also become smaller as the distance increases. If the MCS value of the terminal meets the downward adjustment condition, the downward adjustment condition is that the MCS value is less than or equal to the preset first MCS threshold, then the base station will count whether the MCS value obtained by the terminal in subsequent periods continues to meet the Downgrade conditions. If the cycle that continuously satisfies the down-regulation condition reaches the preset first cycle threshold, reduce the number of subbands of the terminal.

In the actual application process, a down-regulation counter can be set for each terminal, the first MCS threshold is set to 2, the first cycle threshold is 3, and the number of subbands of the terminal is divided into multiple levels, for example, It is divided into 5 levels, and the number of subbands corresponding to levels 1, 2, 3, 4, and 5 are 6, 8, 10, 12, and 14 respectively. When the MCS value of terminal A is less than or equal to 2 in a certain period, the Add 1 to the down-regulation counter of the terminal A, and if the MCS value of the terminal A is greater than 2 in the next cycle, set the down-regulation counter to zero until the down-regulation counter reaches 3, then down-regulate the subband of the terminal A For example, downgrading from level 3 to level 2 is equivalent to reducing the number of subbands of terminal A from 10 to 8, and at the same time resetting the down-regulation counter.

Since the total uplink transmission power of the terminal is constant, the fewer the number of sub-bands, the greater the transmission power and coverage of each sub-band, and the better the signal received by the base station , so that the MCS value obtained by the base station monitoring the terminal in the next period is very likely to be improved.

Further, the step S02 is specifically:

S021. If the number of cycles in which the MCS value of the terminal continuously satisfies the preset downward adjustment condition reaches the preset first cycle threshold and the number of subbands of the terminal is greater than the preset first threshold number of subbands, reduce the terminal the number of subbands.

The base station will preset the minimum number of subbands that can be allocated to each terminal, that is, the first threshold of the number of subbands corresponding to the lowest subband number level. When it is determined that the current number of subbands of the terminal reaches the first When the sub-band number threshold or the current sub-band number level is the lowest sub-band number level, even if the number of cycles whose MCS value continuously meets the down-regulation condition reaches the first cycle threshold, the sub-band number level of the terminal will not be lowered.

In the embodiment of the present invention, the base station periodically monitors the MCS value of each terminal, and when the number of cycles when the MCS value of the terminal continuously meets the preset down-regulation condition reaches the preset first cycle threshold, the terminal is down-regulated The number of sub-bands, thereby improving the channel condition and transmission efficiency between the terminal and the base station, and expanding the coverage of the terminal without affecting service transmission.

FIG. 2 is a flow chart of a coverage optimization method in another wireless communication system according to an embodiment of the present invention. As shown in FIG. 2, after step S02, the method further includes:

Step S03: If the number of periods in which the MCS value of the terminal continuously meets the preset upward adjustment condition reaches the preset second period threshold, increase the number of subbands of the terminal; wherein, the upward adjustment condition is specifically: the MCS The value is greater than or equal to a preset second MCS threshold, and the second MCS threshold is greater than the first MCS threshold.

Contrary to the zoom-out process, when the mobile terminal is getting closer to the base station, the terminal's MCS value becomes higher and higher because the signal of the terminal received by the base station side becomes clearer. Therefore, when the MCS value of the terminal is greater than or equal to the preset second MCS threshold, it is determined that the terminal meets the upward adjustment condition, and the second MCS threshold is greater than the first MCS threshold. At this time, the base station will count the Whether the MCS value of the terminal also satisfies the upward adjustment condition, and when the number of periods in which the terminal continuously meets the upward adjustment condition reaches a preset second period threshold, the number of subbands of the terminal is increased.

For example, an upward adjustment counter is set for each terminal, the second MCS threshold is set to 10, and the second cycle threshold is 3. When the MCS value of terminal A is greater than or equal to 10 in a certain cycle, the terminal A’s Add 1 to the up-regulation counter, and if the MCS value of terminal A is less than 10 in the next period, set the up-up counter to zero until the up-up counter reaches 3, then up-up the current sub-band level of terminal A, for example , level 3 is adjusted to level 4, which is equivalent to increasing the number of subbands of terminal A from 10 to 12, and at the same time resetting the up-regulation counter.

Although the number of sub-bands of the terminal is increased, since the MCS value of the terminal is in a good state, even if the transmit power of each sub-band is reduced, it will not cause excessive transmission performance between the terminal and the base station influence, and at the same time, the number of subbands reduced by the terminal due to the distance can also be restored to an ideal number again.

The steps S02 and S03 can be performed at the same time in no particular order. In the embodiment of the present invention, only step S02 comes first and step S03 comes later as an example for illustration.

Further, the step S03 is specifically:

Step S031, if the number of cycles in which the terminal's MCS value continuously meets the preset upward adjustment condition reaches the preset second cycle threshold and the number of sub-bands of the terminal is smaller than the preset second sub-band number threshold, increase the The number of subbands for the terminal.

The base station will set the maximum number of subbands that can be allocated to the terminal, that is, the second subband number threshold corresponding to the highest subband number level. When the current subband number of the terminal reaches the second subband number threshold or When the subband number level reaches the highest subband number level, even if the number of periods in which the terminal's MCS value continuously meets the increase condition reaches the second period threshold, the terminal's subband number level will not be raised again .

In the embodiment of the present invention, the base station periodically monitors the MCS value of each terminal, and when the number of cycles in which the MCS value of the terminal continuously satisfies the preset upward adjustment condition reaches the preset second cycle threshold, the base station of the terminal is raised. The number of subbands improves the transmission efficiency between the terminal and the base station without affecting service transmission.

In the above embodiment, further, the step S01 is specifically:

Monitor the signal to interference plus noise ratio (Signal to Interferenceplus Noise Ratio, SINR) of each terminal within a preset period;

According to the SINR, the MCS value of the terminal in the current period is obtained.

The base station obtains the MCS value of each terminal, specifically by monitoring the SINR value of each terminal within a period, and after obtaining the SINR value of each terminal, through the mapping relationship between the SINR value and the MCS value to get the MCS value of each terminal.

In the embodiment of the present invention, the base station monitors the SINR of each terminal, obtains the MCS value of the terminal according to the mapping relationship with the MCS, and then adjusts the number of subbands of the terminal according to the statistics of the MCS value, so that Without affecting service transmission, the transmission efficiency between the terminal and the base station is improved.

Based on the above embodiments, further, the method further includes:

If the terminal is offline, the MCS value of the terminal is defaulted to the first MCS threshold.

If the base station cannot monitor the terminal in a certain period, that is, the terminal is offline, the terminal is defaulted to exceed the coverage of the base station, and the MCS value of the terminal in this period is defaulted to the first MCS threshold , and add 1 to the down-regulation counter of the terminal, and then determine whether to down-regulate the number of subbands of the terminal according to the value of the down-regulation counter.

In the embodiment of the present invention, when the terminal is offline, the MCS value of the terminal is defaulted to the first MCS threshold value, the down-regulation counter is increased, and then it is judged whether to down-regulate the number of subbands of the terminal, thereby improving the service transmission without affecting the service transmission. The transmission efficiency between the terminal and the base station is improved.

FIG. 3 is a structural diagram of a base station for coverage optimization in a wireless communication system according to an embodiment of the present invention. As shown in FIG. 3 , the base station includes: a monitoring module 10 and a scheduling module 11, wherein,

The monitoring module 10 is used to periodically obtain the MCS value of each terminal according to a preset cycle; the scheduling module 11 is used to obtain the preset number of cycles if the MCS value of the terminal continuously meets the preset down-regulation condition. If a period threshold is reached, the number of subbands of the terminal is reduced; wherein, the down-regulation condition is specifically: the MCS value is less than or equal to a preset first MCS threshold. specifically:

The monitoring module 10 performs real-time monitoring on each terminal within the coverage area, and according to the preset period, according to the monitored monitoring data of each terminal, the monitoring module 10 obtains the MCS value corresponding to each terminal, And send to the scheduling module 11.

For a mobile terminal, when the terminal is far away from the monitoring module 10, since the signal received by the monitoring module 10 will become smaller and smaller, the MCS value of the terminal monitored by the monitoring module 10 will also increase with the distance and become smaller. If the scheduling module 11 determines that the MCS value of the terminal meets the preset downward adjustment condition, the downward adjustment condition is that the MCS value is less than or equal to the preset first MCS threshold, then the scheduling module 11 will count the terminal in Whether the MCS value obtained in the subsequent cycle continues to meet the down-regulation condition. If the cycle that continuously satisfies the down-regulation condition reaches the preset first cycle threshold, the scheduling module 11 reduces the number of subbands of the terminal.

In an actual application process, the scheduling module 11 may set a down-regulation counter for each terminal, set the first MCS threshold value to 2, and the first period threshold value to 3, and divide the number of subbands of the terminal into Multiple levels, for example, divided into 5 levels, where the number of subbands corresponding to levels 1, 2, 3, 4, and 5 are 6, 8, 10, 12, and 14, and the MCS value of terminal A is obtained in a certain period When it is less than or equal to 2, add 1 to the down-regulation counter of terminal A, and if the MCS value of terminal A in the next period is greater than 2, set the down-regulation counter to zero until the down-regulation counter reaches 3, then the The scheduling module 11 lowers the level of the number of subbands of the terminal A, for example, from level 3 to level 2, which is equivalent to reducing the number of subbands of the terminal A from 10 to 8, and at the same time resets the down-regulation counter.

Further, the scheduling module 11 is specifically used to:

If the number of cycles in which the MCS value of the terminal continuously meets the preset down-regulation condition reaches the preset first cycle threshold and the number of subbands of the terminal is greater than the preset first threshold number of subbands, then reduce the number of subbands of the terminal. belt number.

The scheduling module 11 will preset the minimum number of subbands that can be allocated to each terminal, that is, the first subband number threshold corresponding to the lowest subband number level, when it is determined that the current number of subbands of the terminal reaches the When the first sub-band number threshold or the current sub-band number level is the lowest sub-band number level, even if the number of cycles whose MCS value continuously meets the down-regulation condition reaches the first cycle threshold, the scheduling module 11 will not down-regulate the terminal's Subband number level.

The base station provided by the embodiment of the present invention is used to execute the above method, and its functions refer to the above method embodiment for details, and its specific method flow is not repeated here.

In the embodiment of the present invention, the monitoring module 10 periodically monitors the MCS value of each terminal. When the number of cycles when the MCS value of the terminal continuously meets the preset down-regulation condition reaches the preset first cycle threshold, the The scheduling module 11 lowers the number of subbands of the terminal, thereby improving the channel condition and transmission efficiency of the terminal, and expanding the coverage of the terminal without affecting service transmission.

Based on the above embodiment, further, the scheduling module is further configured to increase the number of subbands of the terminal if the number of periods in which the MCS value of the terminal continuously meets the preset upward adjustment condition reaches a preset second period threshold ; Wherein, the up-regulation condition is specifically: the MCS value is greater than or equal to a preset second MCS threshold, and the second MCS threshold is greater than the first MCS threshold.

Contrary to the zooming out process, when the mobile terminal is getting closer to the monitoring module, the signal of the terminal received by the monitoring module will become clearer and clearer, making the MCS value of the terminal higher and higher. Therefore, when the MCS value of the terminal is greater than or equal to the preset second MCS threshold, the scheduling module determines that the terminal meets the upward adjustment condition, and the second MCS threshold is greater than the first MCS threshold. At this time, the scheduling module It will count whether the MCS value of the terminal in the subsequent period also meets the upward adjustment condition, and when the number of periods in which the terminal continuously meets the upward adjustment condition reaches the preset second period threshold, the scheduling module will increase the terminal's MCS value. number of subbands.

For example, when the scheduling module sets an upward adjustment counter for each terminal, the second MCS threshold is set to 10, and the second period threshold is 3, when the MCS value of terminal A is greater than or equal to 10 in a certain period, the The upward adjustment counter of the terminal A is increased by 1, and if the MCS value of the terminal A is less than 10 in the next period, the upward adjustment counter is set to zero until the upward adjustment counter reaches 3, then the scheduling module increases the terminal A's current level of the number of subbands, for example, level 3 is increased to level 4, which is equivalent to increasing the number of subbands of terminal A from 10 to 12, and at the same time resetting the up counter.

Further, the scheduling module is specifically configured to, if the number of cycles in which the MCS value of the terminal continuously meets the preset upward adjustment condition reaches the preset second cycle threshold and the number of sub-bands of the terminal is smaller than the preset second sub-band band number threshold, increase the number of sub-bands of the terminal.

The scheduling module will set the maximum number of subbands that the terminal can allocate, that is, the second subband number threshold corresponding to the highest subband number level, when the current subband number of the terminal reaches the second subband number threshold or When the number of sub-bands reaches the highest level of sub-bands, even if the number of periods in which the terminal's MCS value continuously satisfies the upward adjustment condition reaches the second period threshold, the scheduling module will not increase the terminal's MCS value again. Subband number level.

The base station provided by the embodiment of the present invention is used to execute the above method, and its functions refer to the above method embodiment for details, and its specific method flow is not repeated here.

In the embodiment of the present invention, the monitoring module periodically monitors the MCS value of each terminal. When the number of periods in which the terminal's MCS value continuously meets the preset upward adjustment condition reaches the preset second cycle threshold, the scheduling module The number of subbands of the terminal is increased, thereby improving the transmission efficiency of the terminal without affecting service transmission.

FIG. 4 illustrates a schematic diagram of the physical structure of an electronic device. As shown in FIG. 4, the server may include: a processor (processor) 810, a communication interface (Communications Interface) 820, a memory (memory) 830, and a communication bus 840, wherein , the processor 810 , the communication interface 820 , and the memory 830 communicate with each other through the communication bus 840 . The processor 810 can call the logic instructions in the memory 830 to execute the following method: regularly acquire the MCS value of each terminal according to the preset cycle; If the first cycle threshold is set, the number of subbands of the terminal is reduced; wherein, the down-regulation condition is specifically: the MCS value is smaller than or equal to the preset first MCS threshold.

Furthermore, the embodiment of the present invention discloses a computer program product, the computer program product includes a computer program stored on a non-transitory computer-readable storage medium, the computer program includes program instructions, when the program instructions are executed by the computer When executing, the computer can execute the methods provided by the above method embodiments, for example, including: regularly acquiring the MCS value of each terminal according to the preset cycle; if the MCS value of the terminal continuously meets the preset down-regulation condition When the preset first cycle threshold is reached, the number of subbands of the terminal is reduced; wherein, the down-regulation condition is specifically: the MCS value is smaller than or equal to the preset first MCS threshold.

Furthermore, an embodiment of the present invention provides a non-transitory computer-readable storage medium, the non-transitory computer-readable storage medium stores computer instructions, and the computer instructions cause the computer to execute the methods provided by the above-mentioned method embodiments. The method, for example, includes: regularly acquiring the MCS value of each terminal according to a preset cycle; if the number of cycles in which the MCS value of the terminal continuously meets the preset down-regulation condition reaches the preset first cycle threshold, reduce the terminal The number of sub-bands; wherein, the down-regulation condition is specifically: the MCS value is smaller than or equal to a preset first MCS threshold.

Those skilled in the art can understand that: in addition, the above logic instructions in the memory 830 can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disk and other media that can store program codes.

The above-described embodiments such as electronic equipment are only illustrative, and the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, It can be located in one place, or it can be distributed to multiple network elements. Part or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. It can be understood and implemented by those skilled in the art without any creative effort.

Through the above description of the implementations, those skilled in the art can clearly understand that each implementation can be implemented by means of software plus a necessary general-purpose hardware platform, and of course also by hardware. Based on this understanding, the essence of the above technical solution or the part that contributes to the prior art can be embodied in the form of software products, and the computer software products can be stored in computer-readable storage media, such as ROM/RAM, magnetic discs, optical discs, etc., including several instructions to make a computer device (which may be a personal computer, server, or network device, etc.) execute the methods described in various embodiments or some parts of the embodiments.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims (10)

1. A method for coverage optimization in a wireless communication system, comprising:

according to a preset period, the modulation and coding strategy MCS value of each terminal is obtained periodically;

if the MCS value of the terminal continuously meets the preset down-regulation condition and the cycle number reaches the preset first cycle threshold value, the number of sub-bands of the terminal is reduced; wherein, the down-regulating condition is specifically: and the MCS value is smaller than or equal to a preset first MCS threshold value.

2. The method according to claim 1, wherein the method further comprises:

if the MCS value of the terminal continuously meets the preset up-regulation condition and the period number reaches a preset second period threshold value, increasing the number of sub-bands of the terminal; wherein, the up-regulation condition is specifically: the MCS value is greater than or equal to a preset second MCS threshold value, which is greater than the first MCS threshold value.

3. The method of claim 1, wherein the periodically acquiring the modulation and coding scheme MCS value of each terminal according to a preset period is specifically:

monitoring the signal-to-interference-plus-noise ratio SINR of each terminal in a preset period;

and obtaining the MCS value of the terminal in the current period according to the SINR.

4. The method according to claim 1, wherein the method further comprises:

if the terminal is disconnected, the MCS value of the terminal is defaulted to the first MCS threshold value.

5. The method of claim 1, wherein if the number of periods during which the MCS value of the terminal continuously meets the preset down-regulation condition reaches the preset first period threshold, the number of subbands of the terminal is reduced, specifically:

and if the MCS value of the terminal continuously meets the preset down-regulation condition and the number of the periods reaches a preset first period threshold value and the number of the sub-bands of the terminal is larger than the preset first sub-band number threshold value, reducing the number of the sub-bands of the terminal.

6. The method of claim 2, wherein if the number of periods during which the MCS value of the terminal continuously meets the preset up-regulation condition reaches the preset second period threshold, the number of subbands of the terminal is increased, specifically:

if the MCS value of the terminal continuously meets the preset up-regulation condition and the period number reaches the preset second period threshold and the number of the sub-bands of the terminal is smaller than the preset second sub-band number threshold, the number of the sub-bands of the terminal is increased.

7. A base station for coverage optimization in a wireless communication system, comprising:

the monitoring module is used for periodically acquiring the MCS value of each terminal according to a preset period;

the scheduling module is used for reducing the number of sub-bands of the terminal if the MCS value of the terminal continuously meets the preset down-regulation condition and the number of cycles reaches the preset first cycle threshold; wherein, the down-regulating condition is specifically: and the MCS value is smaller than or equal to a preset first MCS threshold value.

8. The base station of claim 7, wherein the scheduling module is further configured to increase the number of subbands of the terminal if the number of periods that the MCS value of the terminal continuously satisfies the preset up-regulation condition reaches a preset second period threshold; wherein, the up-regulation condition is specifically: the MCS value is greater than or equal to a preset second MCS threshold value, which is greater than the first MCS threshold value.

9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the coverage optimization method according to any one of claims 1 to 6 when the program is executed by the processor.

10. A non-transitory computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the coverage optimization method according to any one of claims 1 to 6.

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