CN101873604A

CN101873604A - Method, system and equipment for coverage self-optimization in long-term evolution system

Info

Publication number: CN101873604A
Application number: CN200910082817A
Authority: CN
Inventors: 刘美丽
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: China Academy of Telecommunications Technology CATT
Priority date: 2009-04-22
Filing date: 2009-04-22
Publication date: 2010-10-27

Abstract

The embodiment of the invention discloses a method for coverage self-optimization in a long-term evolution (LTE) system, which comprises the following steps of: detecting that a network coverage problem occurs in a district in the LTE system; determining a parameter adjustment strategy corresponding to the type of the detected network coverage problem according to the corresponding relation or the coverage self-optimization algorithm of the type of the pre-saved network coverage problem and the parameter adjustment strategy for solving the network coverage problem; and adjusting the related parameters of the district according to the determined parameter adjustment strategy. The embodiment of the invention discloses a system and equipment for the coverage self-optimization. By adopting the invention, the self-optimization of network coverage can be realized, thereby the network communication quality is effectively improved.

Description

Method, system and equipment for coverage self-optimization in long term evolution system

Technical Field

The present invention relates to the field of wireless communications, and in particular, to a method, system, and device for coverage self-optimization in a long term evolution system.

Background

Coverage planning and optimization have been an important work of great concern for operators since the birth of mobile communications. Especially, modern mobile communication has been stepped into the era of the third-generation multimedia mobile communication, and the wide application of the new mobile communication technology makes the mobile communication data transmission rate faster and faster, the functions more and more, and the services more rich and colorful. For the user terminal, the competitive strength can be improved only by improving the network quality and enhancing the user satisfaction. The network quality is a key and precondition factor for improving competitiveness, and technically, network optimization is implemented.

Network optimization is a long-term process that extends throughout the development of a network. The satisfaction of mobile users and the awareness of service brands can be increased only by continuously improving the quality of the network, so that more users are attracted and developed. The network optimization is used for carrying out parameter acquisition and data analysis on the network which is put into operation formally, finding out the reasons influencing the network operation quality reduction, enabling the network to reach the optimal operation state through parameter adjustment and adopting certain technical means, enabling the existing network resources to obtain the optimal benefits, and simultaneously providing reasonable suggestions for the future maintenance and planning construction of the network.

Coverage optimization is an important aspect in improving the overall quality, and once coverage of a certain area in a network is problematic, the service quality of a user is seriously affected in the area, and in many cases, a serious problem that the user has no signal, cannot stay in the network, drops calls and the like, which affect the use of the user and are greatly complained by the user occurs, so that the coverage optimization is a top-level task generally concerned by an operator in an initial network planning stage or an optimization stage after network operation. In conventional 2G or 3G systems. Coverage optimization is generally performed manually by a network planning optimization engineer and an operator according to a driving test result obtained by a large number of driving tests performed manually by means of offline network planning optimization software or simulation software and by means of engineering experience accumulated in a long period of time, which undoubtedly consumes a considerable amount of time and manpower and material resources.

In the Long Term Evolution (LTE) stage, starting from the Rel-8 network, a self-organizing network (SON) characteristic is introduced, which includes network self-configuration, self-optimization and self-healing, and it is hoped that through these functions, in the network planning and optimization process, the human participation is reduced, and the operation cost of the network is reduced. Based on this, 3GPP established 4 cases of SON for the collection of schemes and the establishment of standards at the beginning of the standard establishment of Rel-9, wherein coverage self-optimization is one of them. Coverage self-optimization refers to self-elimination of coverage problems that arise in a network.

However, at present, no specific implementation scheme exists in the prior art for how to implement coverage self-optimization.

Disclosure of Invention

The embodiment of the invention provides a method, a system and equipment for coverage self-optimization in a Long Term Evolution (LTE) system, which are used for solving the problem that the coverage self-optimization cannot be realized in the existing LTE system.

The embodiment of the invention provides a method for coverage self-optimization in a Long Term Evolution (LTE) system, which comprises the following steps:

detecting that a cell in the LTE system has a network coverage problem;

determining a parameter adjustment strategy corresponding to the type of the detected network coverage problem according to a corresponding relation or a coverage self-optimization algorithm of the type of the network coverage problem which is stored in advance and a parameter adjustment strategy for solving the network coverage problem;

and adjusting the relevant parameters of the cell according to the determined parameter adjustment strategy.

The embodiment of the invention provides a coverage self-optimization system, which comprises:

the coverage problem detection equipment is used for detecting the network coverage problem occurring in the cell in the long term evolution LTE system;

the coverage self-optimization equipment is used for determining a parameter adjustment strategy corresponding to the type of the network coverage problem detected by the coverage problem detection equipment according to the corresponding relation or the coverage self-optimization algorithm of the type of the network coverage problem which is stored in advance and the parameter adjustment strategy used for solving the network coverage problem;

and the parameter adjustment executing device is used for adjusting the relevant parameters of the cell according to the parameter adjustment strategy determined by the coverage self-optimization device.

An embodiment of the present invention provides a coverage self-optimization device, including:

the storage unit is used for storing the corresponding relation between the type of the network coverage problem and a parameter adjustment strategy for solving the network coverage problem or a coverage self-optimization algorithm;

and the adjustment strategy determining unit is used for determining a parameter adjustment strategy corresponding to the type of the network coverage problem detected by the coverage problem detecting unit according to the corresponding relation or the coverage self-optimization algorithm stored in the storage unit.

The embodiment of the invention provides a parameter adjustment executing device, which comprises:

the receiving unit is used for receiving the parameter adjustment strategy sent by the coverage self-optimization equipment;

and the parameter adjustment executing unit is used for adjusting the relevant parameters of the cell with the network coverage problem according to the parameter adjustment strategy received by the receiving unit.

In the invention, after the network coverage problem of the cell in the LTE system is detected, the parameter adjustment strategy corresponding to the type of the detected network coverage problem is determined according to the corresponding relation or the coverage self-optimization algorithm of the type of the network coverage problem and the parameter adjustment strategy for solving the network coverage problem, and the relevant parameters of the cell are adjusted according to the determined parameter adjustment strategy, so that the freedom of network coverage is realized, namely, the network coverage problem is automatically discovered, the network coverage problem is automatically solved, and the communication quality of the network can be effectively improved.

Drawings

FIG. 1 is a schematic flow chart of a method provided by an embodiment of the present invention;

FIG. 2A is a schematic diagram of coverage hole detection in an embodiment of the present invention;

FIG. 2B is a schematic diagram illustrating coverage hole detection in an embodiment of the present invention;

fig. 3 is a schematic diagram illustrating adjustment of a downtilt angle of an antenna according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a system according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of an apparatus according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of an apparatus according to an embodiment of the present invention.

Detailed Description

In order to implement coverage self-optimization in an LTE system and thereby improve network quality, embodiments of the present invention provide a method for coverage self-optimization in an LTE system.

Referring to fig. 1, the method for coverage self-optimization in an LTE access system provided by the embodiment of the present invention specifically includes the following steps:

step 10: detecting and discovering that a cell in an LTE system has a network coverage problem;

step 11: determining a parameter adjustment strategy corresponding to the type of the detected network coverage problem according to a corresponding relation between the type of the network coverage problem and a parameter adjustment strategy for solving the network coverage problem, or an intelligent optimization algorithm and the like which are stored in advance;

step 12: and adjusting the relevant parameters of the cell according to the determined parameter adjustment strategy.

In step 10, there may be a plurality of detected network coverage problems, and three of them are exemplified below:

first, holes are covered.

A coverage hole is a region in which a UE cannot make any connection to a network, and is referred to as a coverage hole. Coverage holes are a very common and serious problem, for example, if a new building, especially a tall building, is built, it is likely that a coverage hole will appear at the back of the building. After the UE enters the coverage hole, the UE cannot correctly demodulate a Reference Signal (RS), cannot reside in the network, cannot initiate a service, and in short, cannot have any connection with the network.

Second, weak coverage.

The weak coverage refers to a region in which the UE cannot demodulate a signal of one or more specific channels, and the region is referred to as a weak coverage region. The weak coverage is for a specific channel, and when the weak coverage occurs, the UE cannot demodulate the specific channel, and when the coverage hole occurs, the UE cannot demodulate all channels. Here, the specific channel is BCH or the like.

Third, strong coverage.

The strong coverage refers to that the strength of a signal transmitted by one or more specific channels received by the UE in a certain area is too high to cause signal interference to neighboring UEs, and the certain area is called a strong coverage area. The strong coverage is also for a specific channel, and a signal transmitted by the specific channel causes signal interference to neighboring UEs. Here, the specific channel is an RS channel or the like. Both pilot pollution in 2G/3G systems and reference symbol pollution in LTE systems are strong coverage of the RS channel.

The specific detection methods for the three coverage problems can be various, and the following examples are provided:

the detection method of the coverage hole comprises the following steps:

step S01: under the condition that the UE is in a continuous starting state, when the UE cannot contact with a mobile communication system due to the failure of a wireless link of an air interface, recording failure related information, wherein the failure related information comprises a failure type, failure time occurrence time, identification information of the UE and the like;

here, that the UE cannot contact the mobile communication system due to the radio link failure of the air interface means that the UE cannot contact the mobile communication system not due to the UE itself or due to a user operation (such as a mechanical failure of the UE device itself, a user power-off, a battery unplugging, etc.), but due to some form of failure of the radio link of the air interface. The specific situations of radio link failure of the air interface are as follows: the UE cannot correctly demodulate physical layer data, physical layer loss of synchronization, CRC check failure, etc. The types of radio link failure for the air interface recorded by the UE include, but are not limited to, the following three: radio Link Failure (RLF), cell selection failure, cell reselection failure. If the UE fails due to the UE itself or due to user operation, not the air interface, the UE does not have to record the failure related information.

Step S02: judging whether the UE supports the satellite positioning function, if so, going to step S03; otherwise, go to step S04;

step S03: when the radio link of the air interface fails, the UE immediately starts a satellite positioning function, acquires the geographical position information of the UE in which the radio link of the air interface fails through a satellite positioning system, and records the geographical position information;

here, when the UE cannot contact the mobile communication system due to air interface failure, the positioning method based on the mobile communication system is inoperable, but the UE can still contact the satellite positioning system because the satellite positioning system and the mobile communication system are two independently operated systems. The satellite positioning system comprises a GPS, a Beidou satellite and other satellite positioning systems.

Step S04: the UE waits for the wireless link of the air interface to fail and recover, records the information of recovering the normal connection with the network when the failure recovers, and acquires the geographical position information of the UE when the failure recovers through a positioning mode based on the mobile communication network supported by the UE; or, acquiring the geographical location information of the UE in failure recovery by a network side based on a positioning mode of the mobile communication network;

here, the positioning method based on the mobile communication network includes, but is not limited to: when determining which positioning method is used, a method with as high accuracy as possible is selected in principle by observing an Observed Time Difference Of Arrival (OTDOA) method, an Angle Of Arrival (AOA), and the like. Radio link failure recovery for the air interface may be determined when, but not limited to, two events occur:

first, the radio link recovery after RLF, for example, in WCDMA/TD-SCDMA/LTE systems, if N consecutive synchronization indications are received before the T310 timer is not timed out in a radio link control (RRC) layer, it is considered as the failure recovery of the radio link.

Second, cell selection or cell reselection is successful.

Step S05: after the radio link failure of the air interface is recovered, the UE reports the geographical position information of the UE acquired in the step S03 or the step S04 to the network side;

step S06: after receiving the geographical location information reported by the UE or acquiring the geographical location information of the UE during the failure recovery, the network side judges whether a coverage hole and the cell position of the coverage hole exist in a certain area according to a preset rule.

The specific rule adopted for judgment is a specific implementation problem inside the network device, and different network device manufacturers can select or set a reasonable rule by themselves when deploying the network device. This is illustrated here by way of example only:

in step S03, first, the location points corresponding to the received geographical location information are determined, the determined location points are used as failure points, and then the failure points are connected to form a closed region as a region where a coverage hole occurs, as shown in fig. 2A.

In step S04, first, the location points corresponding to the received or acquired geographical location information are determined, the determined location points are used as recovery points, and then the recovery points are connected to form a closed region as a region where a coverage hole occurs, as shown in fig. 2B.

In the coverage hole detection method in steps S01-S06, the UE reports the geographical location information of the UE when the UE fails, or reports the geographical location information when the UE fails to recover. In addition, when the UE supports the satellite positioning function, the UE may report the geographical location information when the failure occurs, and also report the geographical location information when the failure recovers. When the network side determines the cell position of the coverage hole according to the reported geographical position information when the failure occurs and the geographical position information when the failure recovers, the determined failure point and the determined recovery point can be connected, and the formed closed area is used as the area where the coverage hole occurs.

For the two network coverage problems of weak coverage and strong coverage, since the weak coverage and the strong coverage are both for specific channels, different detection methods for different channels, the weak coverage and the strong coverage can be implemented in the prior art, and are not described herein again.

In step 11, for different types of network coverage problems, the corresponding parameter adjustment policies may be different, and for the same type of network coverage problems, the corresponding parameter adjustment policies may also be different, what kind of parameter adjustment policy needs to be adopted is a specific implementation problem inside the network device, and different network device manufacturers may select and set different policies when deploying specific network devices, which is only exemplified below:

when the network coverage problem is a coverage hole, the corresponding parameter adjustment strategy may be one or any combination of adjustment of a base station antenna downtilt angle, adjustment of a base station antenna direction angle, and adjustment of channel power, and an adjustment mode of the base station antenna downtilt angle or direction angle may be preferentially selected.

When the adjustment mode of the base station antenna downward inclination angle is adopted, the downward inclination angle of the base station antenna covering the cell (the cell) with the coverage hole and/or the downward inclination angle of the base station antenna covering the adjacent cell of the cell are/is used as input parameters of the coverage self-optimization, the input parameters are adjusted to be small according to a preset first angle adjustment amplitude value, so that the base station antenna of the cell and/or the adjacent cell covers the coverage hole, and the adjusted parameters are used as output parameters of the coverage self-optimization. There may be one or more neighbor cells. The value range of the first angle adjustment amplitude value is 0 to 90 degrees, and the specific value can be set according to engineering experience or simulation results.

When the adjustment mode of the direction angle of the base station antenna is adopted, the direction angle of the base station antenna covering the cell and/or the direction angle of the base station antenna covering the adjacent cell of the cell are/is used as an input parameter for coverage self-optimization, the input parameter is adjusted according to a preset second angle adjustment amplitude value, so that the base station antenna of the cell and/or the adjacent cell covers a coverage hole, and the adjusted parameter is used as an output parameter for coverage self-optimization; there may be one or more neighbor cells. The value range of the second angle adjustment amplitude value is 0 to 90 degrees, and the specific value can be set according to engineering experience or simulation results.

For example, as shown in fig. 3, α 1 is a downward inclination angle of a base station antenna covering a local cell, that is, a cell in which a coverage hole appears, β 1 is a direction angle of the base station antenna covering the local cell, α 2 is a downward inclination angle of a base station antenna covering a neighboring cell of the local cell, and β 2 is a direction angle of the base station antenna covering the neighboring cell. The downward inclination angle of the base station antenna is the downward inclination angle of the directional panel antenna, and the direction angle of the base station antenna is the included angle between the axis of the antenna paraboloid and the true north pole. The coverage hole problem can be solved by one or any combination of the following ways:

firstly, turning down alpha 1 to make the base station antenna of the local cell cover the coverage hole;

secondly, reducing alpha 2 to enable a base station antenna of an adjacent cell to cover a coverage hole;

thirdly, adjusting beta 1 to enable the base station antenna of the cell to cover the coverage hole;

fourth, β 2 is adjusted so that the base station antennas of the neighboring cells cover the coverage hole.

Adjusting the downtilt or azimuth of the base station antenna can solve the problem of coverage holes for the following reasons:

as shown in fig. 3, α 1 is a down tilt angle of a base station antenna covering a local cell, that is, a cell in which a coverage hole appears, β 1 is a directive angle of a base station antenna covering the local cell, α 2 is a down tilt angle of a base station antenna covering a neighboring cell of the local cell, and β 2 is a directive angle of a base station antenna covering the neighboring cell. Using the principle of geometry, the coverage areas of the cell and the adjacent cells can be estimated according to alpha 1, beta 1, alpha 2 and beta 2, and then the overlapping area of the two cells is estimated, when the area of the overlapping area is smaller than the preset switching area, or the base station of one cell can not work normally, it can be judged that a coverage hole is likely to appear, in order to cover the coverage hole area as much as possible, the area of the overlapping area needs to be enlarged or the coverage area needs to be adjusted, according to the mathematical principle, the adjusted downward inclination angle or direction angle is calculated, and the downward inclination angle or direction angle is adjusted correspondingly according to the adjusted parameters. In fig. 3, the thin line arrow indicates the antenna before the downtilt adjustment, and the thick line arrow indicates the antenna after the downtilt adjustment.

When the power adjustment mode is adopted, one or any combination of an uplink traffic channel, a downlink common channel and a Reference Symbol (RS) channel can be adjusted. Specifically, the method comprises the following steps:

if the uplink service channel is adjusted, the power related parameters of the uplink service channel in the cell with the coverage hole are adjusted according to the preset first uplink power adjustment amplitude value, so that the transmitting power of the uplink service data of the UE is improved, and the UE in the adjacent cell is not seriously interfered. The power-related parameters include, but are not limited to: the UE power class, uplink power control parameters, and uplink IoT threshold are typically adjusted to increase the uplink traffic channel power. The first uplink power adjustment amplitude value may be set according to engineering experience or simulation results.

If the downlink traffic channel is adjusted, the power related parameters of the downlink traffic channel in the cell with the coverage hole are adjusted according to the preset first downlink power adjustment amplitude value, so that the transmitting power of the downlink traffic data of the base station is improved, and the UE in the adjacent cell is not seriously interfered. When the downlink traffic channel is BCH, the power related parameter includes BCH power, when the downlink channel is downlink RS, the power related parameter includes RS power, and when the downlink traffic channel is DSCH, the power related parameter includes DSCH downlink power control parameters (such as PA, PB, and the like). These parameter values are typically adjusted to cause the downlink traffic channel power to increase. The first downlink power adjustment amplitude value may be set according to engineering experience or simulation results.

If the downlink common channel is adjusted, adjusting the power related parameters of the downlink common channel in the cell with the coverage hole according to a preset second downlink power adjustment amplitude value, so that the transmitting power of the downlink common data of the base station is improved, and the UE in the adjacent cell is not seriously interfered. When the lower traffic channel is PCH, the power related parameter includes PCH power. These parameter values are typically adjusted to increase the downlink common channel power. The second downlink power adjustment amplitude value may be set according to engineering experience or simulation results. The second downlink power adjustment amplitude value may be equal to the first downlink power adjustment amplitude value.

If the RS channel is adjusted, adjusting the power related parameters of the reference symbol channel in the cell according to a preset first reference symbol power adjustment amplitude value, so that the transmitting power of the reference symbol in the cell is increased, and the UE in the adjacent cell is not seriously interfered; the first reference symbol power adjustment amplitude value may be set according to engineering experience or simulation results.

The power related parameters that can be adjusted when the channel power adjustment method is adopted are summarized in the following list manner:

TABLE 1

When the network coverage problem is weak coverage, the corresponding parameter adjustment strategy may also be one or a desired combination of adjustment of a base station antenna downtilt angle, adjustment of a base station antenna direction angle, and adjustment of channel power, and a channel power adjustment mode may be preferentially selected, because weak coverage is for a specific channel, when a certain channel has weak coverage, power adjustment may be performed only for the channel.

When the power adjustment mode is adopted, one or any combination of an uplink service channel, a downlink common channel and an RS channel can be adjusted. The adjustable power related parameters can be seen in table 1 above, specifically:

if the uplink service channel is adjusted, adjusting the power related parameters of the uplink service channel in the cell with weak coverage according to a preset second uplink power adjustment amplitude value, so that the transmitting power of the uplink service data of the UE is improved, and the UE in the adjacent cell is not seriously interfered. The power-related parameters include, but are not limited to: the UE power class, uplink power control parameters, and uplink IoT threshold are typically adjusted to increase the uplink traffic channel power. The second uplink power adjustment amplitude value may be set according to engineering experience or simulation results.

If the downlink traffic channel is adjusted, adjusting the power related parameters of the downlink traffic channel in the cell with weak coverage according to a preset third downlink power adjustment amplitude value, so that the transmitting power of the downlink traffic data of the base station is improved, and signal interference is not generated on the UE in the adjacent cell. When the downlink traffic channel is BCH, the power related parameter includes BCH power, when the downlink channel is downlink RS, the power related parameter includes RS power, and when the downlink traffic channel is DSCH, the power related parameter includes DSCH downlink power control parameters (such as PA, PB, and the like). These parameter values are typically adjusted to cause the downlink traffic channel power to increase. The third downlink power adjustment amplitude value may be set according to engineering experience or simulation results.

If the downlink common channel is adjusted, adjusting the power related parameters of the downlink common channel in the cell with weak coverage according to a preset fourth downlink power adjustment amplitude value, so that the transmitting power of the downlink common data of the base station is improved, and signal interference is not generated on the UE in the adjacent cell. When the lower traffic channel is PCH, the power related parameter includes PCH power. These parameter values are typically adjusted to increase the downlink common channel power. The fourth downlink power adjustment amplitude value may be set according to engineering experience or simulation results. The fourth downlink power adjustment amplitude value may be equal to the third downlink power adjustment amplitude value.

If the RS channel is adjusted, adjusting the power related parameters of the reference symbol channel in the cell according to a preset second reference symbol power adjustment amplitude value, so that the transmitting power of the reference symbol in the cell is increased, and the UE in the adjacent cell is not seriously interfered; the second reference symbol power adjustment amplitude value may be set according to engineering experience or simulation results.

When a base station antenna downward inclination angle adjusting mode is adopted, taking the downward inclination angle of a base station antenna covering a cell (a local cell) with weak coverage and/or the downward inclination angle of a base station antenna covering a cell adjacent to the local cell as an input parameter of coverage self-optimization, adjusting the input parameter to be small according to a preset third angle adjusting amplitude value, increasing the coverage area of the base station antenna of the local cell and/or the adjacent cell, and taking the adjusted parameter as an output parameter of the coverage self-optimization; there may be one or more neighbor cells. The value range of the third angle adjustment amplitude value is 0 to 90 degrees, and the specific value can be set according to engineering experience or simulation results.

When a base station antenna direction angle adjusting mode is adopted, the direction angle of the base station antenna covering the cell and/or the direction angle of the base station antenna covering the adjacent cell of the cell are/is used as an input parameter for coverage self-optimization, the input parameter is adjusted according to a preset fourth angle adjusting amplitude value, so that the coverage area of the base station antenna of the cell and/or the adjacent cell is increased, and the adjusted parameter is used as an output parameter for coverage self-optimization. There may be one or more neighbor cells. The value range of the fourth corner adjustment amplitude value is 0 to 90 degrees, and the specific value can be set according to engineering experience or simulation results.

For example, as shown in fig. 3, the weak coverage problem can be solved in one or any combination of the following ways:

firstly, reducing alpha 1 to increase the coverage area of the base station antenna of the cell;

secondly, reducing alpha 2 to increase the coverage area of the base station antenna of the adjacent cell;

thirdly, adjusting beta 1 to increase the coverage area of the base station antenna of the cell;

fourthly, β 2 is adjusted so that the coverage area of the base station antenna of the neighboring cell increases.

The reason why the problem of weak coverage can be solved by adjusting the down tilt angle or the direction angle of the base station antenna to be small can be seen from the analysis of the coverage hole, and the area of the coverage area of the base station antenna of the local cell or the neighboring cell is increased by adjusting the down tilt angle or the direction angle of the base station antenna to be small or properly adjusting the direction angle.

When the network coverage problem is strong coverage, the corresponding parameter adjustment strategy may also be one or any combination of adjustment of a base station antenna downtilt angle, a base station antenna direction angle, and channel power adjustment, and a channel power adjustment mode may be preferentially selected, because strong coverage is for a specific channel, when strong coverage occurs for a certain channel, power adjustment may be performed only for the channel.

if the uplink service channel is adjusted, adjusting the power related parameters of the uplink service channel in the cell with strong coverage according to a preset third uplink power adjustment amplitude value, so that the transmitting power of the uplink service data of the UE is reduced, and the signal interference to the UE in the adjacent cell is reduced. The power-related parameters include, but are not limited to: the UE power class, uplink power control parameters, and uplink IoT threshold are typically adjusted to reduce the uplink traffic channel power. The third uplink power adjustment amplitude value may be set according to engineering experience or simulation results.

If the downlink traffic channel is adjusted, adjusting the power related parameters of the downlink traffic channel in the cell with strong coverage according to a preset fifth downlink power adjustment amplitude value, so that the transmitting power of the downlink traffic data of the base station is reduced, and further, the signal interference to the neighboring cell UE is reduced. When the downlink traffic channel is BCH, the power related parameter includes BCH power, when the downlink traffic channel is downlink RS, the power related parameter includes RS power, and when the downlink traffic channel is DSCH, the power related parameter includes DSCH downlink power control parameters (such as PA, PB, and the like). These parameter values are typically adjusted to reduce the downlink traffic channel power. The fifth downlink power adjustment amplitude value may be set according to engineering experience or simulation results.

If the downlink common channel is adjusted, adjusting the power related parameters of the downlink common channel in the cell with strong coverage according to a preset sixth downlink power adjustment amplitude value, so that the transmitting power of the downlink common data of the base station is reduced, and the signal interference to the neighboring cell UE is reduced. When the lower traffic channel is PCH, the power related parameter includes PCH power. These parameter values are typically adjusted to reduce the downlink common channel power. The sixth downlink power adjustment amplitude value may be set according to engineering experience or simulation results. The sixth downlink power adjustment amplitude value may be equal to the fifth downlink power adjustment amplitude value.

If the RS channel is adjusted, adjusting the power related parameters of the reference symbol channel in the cell according to a preset third reference symbol power adjustment amplitude value, so that the transmitting power of the reference symbol in the cell is reduced; the third reference symbol power adjustment amplitude value may be set according to engineering experience or simulation results.

When a base station antenna downtilt angle adjusting mode is adopted, taking the downtilt angle of a base station antenna covering a cell (a local cell) with strong coverage and/or the downtilt angle of a base station antenna covering a cell adjacent to the local cell as an input parameter for self-optimization of coverage, adjusting the input parameter to be larger according to a preset fifth angle adjusting amplitude value, so that the overlapping coverage area of the base station antennas of the cell and the adjacent cell is reduced, and taking the adjusted parameter as an output parameter for self-optimization of coverage; there may be one or more neighbor cells. The value range of the fifth angle adjustment amplitude value is 0 to 90 degrees, and the specific value can be set according to engineering experience or simulation results.

When a base station antenna direction angle adjusting mode is adopted, taking the direction angle of a base station antenna covering the cell and/or the direction angle of a base station antenna covering a cell adjacent to the cell as a coverage self-optimization input parameter, adjusting the input parameter according to a preset sixth angle adjusting amplitude value to reduce the overlapping coverage area of the base station antennas of the cell and the adjacent cell, and taking the adjusted parameter as a coverage self-optimization output parameter; there may be one or more neighbor cells. The value range of the sixth adjustment amplitude value is 0 to 90 degrees, and the specific value can be set according to engineering experience or simulation results.

For example, as shown in fig. 3, the strong coverage problem can be solved in one or any combination of the following ways:

firstly, increasing alpha 1 to reduce the overlapping coverage area of the base station antennas of the cell and the adjacent cell;

secondly, increasing alpha 2 to reduce the overlapping coverage area of the base station antennas of the cell and the adjacent cell;

thirdly, adjusting beta 1 to reduce the overlapping coverage area of the base station antennas of the cell and the adjacent cell;

fourthly, adjusting beta 2 to reduce the overlapping coverage area of the base station antennas of the cell and the adjacent cell.

Adjusting the downtilt or azimuth of the base station antenna can solve the problem of weak coverage for the following reasons:

as shown in fig. 3, the area of the overlapping area between the coverage areas of the current cell and the neighboring cell is larger than the preset handover area, or when the area of the overlapping area is too large due to the addition of a new base station, it can be determined that strong coverage may occur, so that the area of the overlapping area needs to be reduced to reduce signal interference, the downward inclination angle is increased, or the adjusted direction angle is calculated according to the mathematical principle to properly stagger the overlapping areas of the two cells, and the area of the overlapping area will be reduced accordingly.

Referring to fig. 4, an embodiment of the present invention further provides a coverage self-optimization system, including:

coverage problem detection equipment 40, configured to detect a network coverage problem occurring in a cell in a long term evolution LTE system;

the coverage self-optimization device 41 is configured to determine, according to a correspondence relationship between a type of a network coverage problem stored in advance and a parameter adjustment policy for solving the network coverage problem or a coverage self-optimization algorithm, a parameter adjustment policy corresponding to the type of the network coverage problem detected by the coverage problem detection device;

and the parameter adjustment executing device 42 is configured to adjust the relevant parameters of the cell according to the parameter adjustment policy determined by the coverage self-optimization device.

The system further comprises:

a User Equipment (UE)43 for determining that a radio link of an air interface has failed; acquiring the geographical location information of the UE when the failure occurs and/or the geographical location information of the UE when the failure recovers; after the failure recovery, reporting the obtained geographical position information to the coverage problem detection equipment; the UE acquires the geographical position information of the UE when the failure occurs through a satellite positioning function supported by the UE; the UE acquires the geographical position information of the UE in the failure recovery through a positioning mode based on a mobile communication network supported by the UE;

the coverage problem detection apparatus 40 is configured to: and determining the position of the cell with the coverage hole according to the received geographical position information and/or the geographical position information acquired by the user equipment when the user equipment is in the failure recovery.

The parameter adjustment performing device 42 is configured to:

when the network coverage problem is a coverage hole, taking a downward inclination angle of a base station antenna covering the cell and/or a downward inclination angle of a base station antenna covering a neighboring cell of the cell as a coverage self-optimization input parameter, adjusting an amplitude value according to a preset first angle to reduce the input parameter, enabling the base station antenna of the cell and/or the neighboring cell to cover the coverage hole, and taking the adjusted parameter as a coverage self-optimization output parameter;

when the network coverage problem is a coverage hole, taking a direction angle of a base station antenna covering the cell and/or a direction angle of a base station antenna covering a cell adjacent to the cell as a coverage self-optimization input parameter, adjusting the input parameter according to a preset second angle adjustment amplitude value to enable the base station antenna of the cell and/or the cell adjacent to the cell to cover the coverage hole, and taking the adjusted parameter as a coverage self-optimization output parameter;

when the network coverage problem is a coverage hole, adjusting power related parameters of a reference symbol channel in the cell according to a preset first reference symbol power adjustment amplitude value to increase the transmission power of the reference symbol in the cell;

when the network coverage problem is a coverage hole, adjusting the power related parameters of the uplink service channel in the cell according to a preset first uplink power adjustment amplitude value, so that the transmission power of the uplink service signal of the UE in the cell is increased;

when the network coverage problem is a coverage hole, adjusting the power related parameters of the downlink traffic channel in the cell according to a preset first downlink power adjustment amplitude value, so that the transmission power of the downlink traffic signal of the base station in the cell is increased;

and when the network coverage problem is a coverage hole, adjusting the power related parameters of the downlink common channel in the cell according to a preset second downlink power adjustment amplitude value, so that the transmission power of the downlink common signal of the base station in the cell is increased.

The parameter adjustment performing device 42 is configured to:

when the network coverage problem is weak coverage, taking a downward inclination angle of a base station antenna covering the cell and/or a downward inclination angle of a base station antenna covering a cell adjacent to the cell as an input parameter of coverage self-optimization, adjusting an amplitude value according to a preset third angle to reduce the input parameter so as to increase the coverage area of the base station antenna of the cell and/or the cell adjacent to the cell, and taking the adjusted parameter as an output parameter of the coverage self-optimization;

when the network coverage problem is weak coverage, taking the direction angle of the base station antenna covering the cell and/or the direction angle of the base station antenna covering the adjacent cell of the cell as a coverage self-optimization input parameter, adjusting the input parameter according to a preset fourth angle adjustment amplitude value to increase the coverage area of the base station antenna of the cell and/or the adjacent cell, and taking the adjusted parameter as a coverage self-optimization output parameter;

when the network coverage problem is weak coverage, adjusting the power related parameters of the reference symbol channel in the cell according to a preset second reference symbol power adjustment amplitude value, so that the transmitting power of the reference symbol in the cell is increased;

when the network coverage problem is weak coverage, adjusting the power related parameters of the uplink service channel in the cell according to a preset second uplink power adjustment amplitude value, so that the transmission power of the uplink service signal of the UE in the cell is increased;

when the network coverage problem is weak coverage, adjusting the power related parameters of the downlink service channel in the cell according to a preset third downlink power adjustment amplitude value, so that the transmission power of the downlink service signal of the base station in the cell is increased;

and when the network coverage problem is weak coverage, adjusting the power related parameters of the downlink common channel in the cell according to a preset fourth downlink power adjustment amplitude value, so that the transmission power of the downlink common signal of the base station in the cell is increased.

The parameter adjustment performing device 42 is configured to:

when the network coverage problem is strong coverage, taking a downward inclination angle of a base station antenna covering the cell and/or a downward inclination angle of a base station antenna covering a cell adjacent to the cell as an input parameter for coverage self-optimization, adjusting an amplitude value according to a preset fifth angle to increase the input parameter so as to reduce the overlapping coverage area of the base station antennas of the cell and the cell adjacent to the cell, and taking the adjusted parameter as an output parameter for coverage self-optimization;

when the network coverage problem is strong coverage, taking the direction angle of the base station antenna covering the cell and/or the direction angle of the base station antenna covering the adjacent cell of the cell as a coverage self-optimization input parameter, adjusting the input parameter according to a preset sixth angle adjustment amplitude value to reduce the overlapping coverage area of the base station antennas of the cell and the adjacent cell, and taking the adjusted parameter as a coverage self-optimization output parameter;

when the network coverage problem is strong coverage, adjusting the power related parameters of the reference symbol channel in the cell according to a preset third reference symbol power adjustment amplitude value, so that the transmitting power of the reference symbol in the cell is reduced;

when the network coverage problem is strong coverage, adjusting the power related parameters of the uplink service channel in the cell according to a preset third uplink power adjustment amplitude value, so that the transmission power of the uplink service signal of the UE in the cell is reduced;

when the network coverage problem is strong coverage, adjusting the power related parameters of the downlink service channel in the cell according to a preset fifth downlink power adjustment amplitude value, so that the transmission power of the downlink service signal of the base station in the cell is reduced;

and when the network coverage problem is strong coverage, adjusting the power related parameters of the downlink common channel in the cell according to a preset sixth downlink power adjustment amplitude value, so that the transmission power of the downlink common signal of the base station in the cell is reduced.

The power related parameters of the uplink traffic channel include: the power class of the UE, the uplink power control parameter, and the uplink IoT threshold.

The power related parameters of the downlink traffic channel include: BCH power, DSCH downlink power control parameters; the power related parameters of the downlink common channel comprise: the PCH power.

In the system, the coverage self-optimization device and the parameter adjustment execution device may be located on the same physical entity, or may be located on different physical entities. When the overlay self-optimization device and the parameter adjustment execution device are located on different physical entities, the overlay self-optimization device needs to send the determined parameter adjustment policy to the parameter adjustment execution device through an interface. The coverage self-optimization device may specifically be a SON server, and the SON server may be a separate device, or may be located on a base station, a network management center, or other network devices. The parameter adjustment executing device may specifically be a base station, a terminal, and the like, for example, when a downward tilt angle/a direction angle of an antenna of the base station needs to be adjusted or power of a downlink channel needs to be adjusted, the parameter adjustment executing device is the base station, and when power of an uplink channel needs to be adjusted, the parameter adjustment executing device is the terminal.

Referring to fig. 5, an embodiment of the present invention further provides a coverage self-optimization device, where the coverage self-optimization device includes:

a storage unit 50, configured to store a correspondence between a type of a network coverage problem and a parameter adjustment policy for solving the network coverage problem or a coverage self-optimization algorithm;

and an adjustment policy determining unit 51, configured to determine, according to the correspondence or the coverage self-optimization algorithm stored in the storage unit, a parameter adjustment policy corresponding to the type of the network coverage problem detected by the coverage problem detecting unit.

The apparatus further comprises:

a sending unit 52, configured to send the parameter adjustment policy determined by the adjustment policy determining unit to an external parameter adjustment executing device. Or,

the apparatus further comprises:

a parameter adjustment executing unit 53, configured to adjust the relevant parameters of the cell according to the parameter adjustment policy determined by the adjustment policy determining unit. For a specific parameter adjustment strategy, reference may be made to the description of the method section, which is not described herein again.

The coverage self-optimization device may specifically be a SON server, and the SON server may be a separate device, or may be located on a base station, a network management center, or other network devices.

Referring to fig. 6, an embodiment of the present invention further provides a parameter adjustment executing apparatus, where the apparatus includes:

a receiving unit 60, configured to receive a parameter adjustment policy sent from the coverage self-optimization device;

and a parameter adjustment executing unit 61, configured to adjust a relevant parameter of the cell with the network coverage problem according to the parameter adjustment policy received by the receiving unit.

The parameter adjustment execution unit 61 includes one or any combination of the following six units:

a first coverage hole adjusting unit, configured to, when the network coverage problem is a coverage hole, use a downtilt angle of a base station antenna covering the cell and/or a downtilt angle of a base station antenna covering a neighboring cell of the cell as an input parameter for coverage self-optimization, adjust the input parameter to be small according to a preset first angle adjustment amplitude value, so that the base station antenna of the cell and/or the neighboring cell covers the coverage hole, and use the adjusted parameter as an output parameter for coverage self-optimization;

a second coverage hole adjusting unit, configured to, when the network coverage problem is a coverage hole, use a directional angle of a base station antenna covering the cell and/or a directional angle of a base station antenna covering a neighboring cell of the cell as an input parameter for coverage self-optimization, adjust the input parameter according to a preset second angle adjustment amplitude value, so that the base station antenna of the cell and/or the neighboring cell covers the coverage hole, and use the adjusted parameter as an output parameter for coverage self-optimization;

a third coverage hole adjusting unit, configured to adjust a power related parameter of a reference symbol channel in the cell according to a preset first reference symbol power adjustment amplitude value when the network coverage problem is a coverage hole, so that the transmission power of the reference symbol in the cell is increased;

a fourth coverage hole adjusting unit, configured to, when the network coverage problem is a coverage hole, adjust a power-related parameter of an uplink traffic channel in the cell according to a preset first uplink power adjustment amplitude value, so that a transmission power of an uplink traffic signal of the UE in the cell is increased;

a fifth coverage hole adjusting unit, configured to, when the network coverage problem is a coverage hole, adjust a power-related parameter of a downlink traffic channel in the cell according to a preset first downlink power adjustment amplitude value, so that a transmission power of a downlink traffic signal of a base station in the cell is increased;

and a sixth coverage hole adjusting unit, configured to, when the network coverage problem is a coverage hole, adjust a power related parameter of a downlink common channel in the cell according to a preset second downlink power adjustment amplitude value, so that the transmission power of a downlink common signal of a base station in the cell is increased.

a first weak coverage adjusting unit, configured to, when the network coverage problem is weak coverage, use a downtilt angle of a base station antenna covering the cell and/or a downtilt angle of a base station antenna covering a neighboring cell of the cell as an input parameter for coverage self-optimization, adjust an amplitude value according to a preset third angle to decrease the input parameter, so that a coverage area of the base station antenna of the cell and/or the neighboring cell is increased, and use the adjusted parameter as an output parameter for coverage self-optimization;

a second weak coverage adjusting unit, configured to, when the network coverage problem is weak coverage, use a directional angle of a base station antenna covering the cell and/or a directional angle of a base station antenna covering a neighboring cell of the cell as an input parameter for coverage self-optimization, adjust the input parameter according to a preset fourth angle adjustment amplitude value, so that a coverage area of the base station antenna of the cell and/or the neighboring cell is increased, and use the adjusted parameter as an output parameter for coverage self-optimization;

a third weak coverage adjusting unit, configured to adjust a power related parameter of a reference symbol channel in the cell according to a preset second reference symbol power adjustment amplitude value when the network coverage problem is weak coverage, so that the transmission power of the reference symbol in the cell is increased;

a fourth weak coverage adjusting unit, configured to adjust a power related parameter of an uplink traffic channel in the cell according to a preset second uplink power adjustment amplitude value when the network coverage problem is weak coverage, so that the transmission power of an uplink traffic signal of the UE in the cell is increased;

a fifth weak coverage adjusting unit, configured to adjust a power related parameter of a downlink traffic channel in the cell according to a preset third downlink power adjustment amplitude value when the network coverage problem is weak coverage, so that the transmission power of a downlink traffic signal of a base station in the cell is increased;

a sixth weak coverage adjusting unit, configured to adjust a power related parameter of the downlink common channel in the cell according to a preset fourth downlink power adjustment amplitude value when the network coverage problem is weak coverage, so that the transmission power of the downlink common signal of the base station in the cell is increased.

a first strong coverage adjusting unit, configured to, when the network coverage problem is strong coverage, use a downtilt angle of a base station antenna covering the cell and/or a downtilt angle of a base station antenna covering a neighboring cell of the cell as an input parameter for coverage self-optimization, adjust an amplitude value according to a preset fifth angle to increase the input parameter, so that an overlapping coverage area of the base station antennas of the cell and the neighboring cell is reduced, and use the adjusted parameter as an output parameter for coverage self-optimization;

a second strong coverage adjusting unit, configured to, when the network coverage problem is strong coverage, use the directional angle of the base station antenna covering the cell and/or the directional angle of the base station antenna covering the neighboring cell of the cell as an input parameter for coverage self-optimization, adjust the input parameter according to a preset sixth angle adjustment amplitude value, so that an overlapping coverage area of the base station antennas of the cell and the neighboring cell is reduced, and use the adjusted parameter as an output parameter for coverage self-optimization;

a third strong coverage adjusting unit, configured to adjust a power related parameter of a reference symbol channel in the cell according to a preset third reference symbol power adjustment amplitude value when the network coverage problem is strong coverage, so that the transmission power of the reference symbol in the cell is reduced;

a fourth strong coverage adjusting unit, configured to adjust a power related parameter of an uplink traffic channel in the cell according to a preset third uplink power adjustment amplitude value when the network coverage problem is strong coverage, so that the transmission power of an uplink traffic signal of the UE in the cell is reduced;

a fifth strong coverage adjusting unit, configured to adjust a power related parameter of a downlink traffic channel in the cell according to a preset fifth downlink power adjustment amplitude value when the network coverage problem is strong coverage, so that the transmission power of a downlink traffic signal of a base station in the cell is reduced;

and a sixth strong coverage adjusting unit, configured to adjust the power related parameter of the downlink common channel in the cell according to a preset sixth downlink power adjustment amplitude value when the network coverage problem is strong coverage, so that the transmission power of the downlink common signal of the base station in the cell is reduced.

The parameter adjustment executing device may specifically be a base station, a terminal, and the like, for example, when a downward tilt angle/a direction angle of an antenna of the base station needs to be adjusted or power of a downlink channel needs to be adjusted, the parameter adjustment executing unit is the base station, and when power of an uplink channel needs to be adjusted, the parameter adjustment executing unit is the terminal.

In conclusion, the beneficial effects of the invention include:

in the scheme provided by the embodiment of the invention, after the network coverage problem of the cell in the LTE system is detected, the parameter adjustment strategy corresponding to the type of the detected network coverage problem is determined according to the corresponding relation between the type of the network coverage problem and the parameter adjustment strategy for solving the network coverage problem, or other intelligent optimization algorithms, and the like, and the relevant parameters of the cell are adjusted according to the determined parameter adjustment strategy, so that the freedom of network coverage is realized, namely, the network coverage problem is automatically found, the network coverage problem is automatically solved, the communication quality of the network can be effectively improved, and the use experience of a user is enhanced.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A method for coverage self-optimization in a Long Term Evolution (LTE) system is characterized by comprising the following steps:

detecting that a cell in the LTE system has a network coverage problem;

2. The method of claim 1, wherein the network coverage problem is:

coverage holes, or weak coverage, or strong coverage.

3. The method of claim 2, wherein if the network coverage problem is a coverage hole, the detecting and finding that a coverage hole occurs in a cell in the LTE system comprises:

user Equipment (UE) determines that a radio link of an air interface fails;

the UE acquires the geographical position information of the UE when the failure occurs; and/or, the UE or the network side acquires the geographical location information of the UE during the failure recovery;

after the failure is recovered, the UE reports the acquired geographical position information to a network side;

and the network side determines the position of the cell with the coverage hole according to the geographical position information reported by the UE and/or the geographical position information acquired by the network side.

4. The method of claim 3, wherein the UE obtains the geographical location information of the UE at the time of the failure through a satellite positioning function supported by the UE.

5. The method of claim 3, wherein the UE or the network side obtains the geographical location information of the UE at the time of the failed recovery by a positioning method based on a mobile communication network.

6. The method of claim 2, wherein if the network coverage problem is a coverage hole, the parameter adjustment policy is one or any combination of the following six:

taking the downward inclination angle of the base station antenna covering the cell and/or the downward inclination angle of the base station antenna covering the adjacent cell of the cell as an input parameter for coverage self-optimization, adjusting the input parameter to be small according to a preset first angle adjustment amplitude value, enabling the base station antenna of the cell and/or the adjacent cell to cover a coverage hole, and taking the adjusted parameter as an output parameter for coverage self-optimization;

taking the direction angle of the base station antenna covering the cell and/or the direction angle of the base station antenna covering the adjacent cell of the cell as an input parameter for coverage self-optimization, adjusting the input parameter according to a preset second angle adjustment amplitude value to enable the base station antenna of the cell and/or the adjacent cell to cover a coverage hole, and taking the adjusted parameter as an output parameter for coverage self-optimization;

adjusting power related parameters of a reference symbol channel in the cell according to a preset first reference symbol power adjustment amplitude value, so that the transmitting power of the reference symbol in the cell is increased;

adjusting power related parameters of an uplink service channel in the cell according to a preset first uplink power adjustment amplitude value, so that the transmission power of an uplink service signal of UE in the cell is increased;

adjusting power related parameters of a downlink traffic channel in the cell according to a preset first downlink power adjustment amplitude value, so that the transmission power of a downlink traffic signal of a base station in the cell is increased;

and adjusting the power related parameters of the downlink common channel in the cell according to a preset second downlink power adjustment amplitude value, so that the transmission power of the downlink common signal of the base station in the cell is increased.

7. The method of claim 2, wherein if the network coverage problem is weak coverage, the parameter adjustment policy is one or any combination of the following six:

taking the downward inclination angle of the base station antenna covering the cell and/or the downward inclination angle of the base station antenna covering the adjacent cell of the cell as an input parameter for coverage self-optimization, adjusting the input parameter to be small according to a preset third angle adjustment amplitude value, so that the coverage area of the base station antenna of the cell and/or the adjacent cell is increased, and taking the adjusted parameter as an output parameter for coverage self-optimization;

taking the direction angle of the base station antenna covering the cell and/or the direction angle of the base station antenna covering the adjacent cell of the cell as an input parameter for coverage self-optimization, adjusting the input parameter according to a preset fourth angle adjustment amplitude value to increase the coverage area of the base station antenna of the cell and/or the adjacent cell, and taking the adjusted parameter as an output parameter for coverage self-optimization;

adjusting power related parameters of a reference symbol channel in the cell according to a preset second reference symbol power adjustment amplitude value, so that the transmitting power of the reference symbol in the cell is increased;

adjusting the power related parameters of the uplink service channel in the cell according to a preset second uplink power adjustment amplitude value, so that the transmission power of the uplink service signal of the UE in the cell is increased;

adjusting the power related parameters of the downlink traffic channel in the cell according to a preset third downlink power adjustment amplitude value, so that the transmission power of the downlink traffic signal of the base station in the cell is increased;

and adjusting the power related parameters of the downlink common channel in the cell according to a preset fourth downlink power adjustment amplitude value, so that the transmission power of the downlink common signal of the base station in the cell is increased.

8. The method of claim 2, wherein if the network coverage problem is strong coverage, the parameter adjustment policy is one or any combination of the following six:

taking the downward inclination angle of the base station antenna covering the cell and/or the downward inclination angle of the base station antenna covering the adjacent cell of the cell as an input parameter for coverage self-optimization, adjusting the input parameter to be larger according to a preset fifth angle adjustment amplitude value, so that the overlapping coverage area of the base station antennas of the cell and the adjacent cell is reduced, and taking the adjusted parameter as an output parameter for coverage self-optimization;

taking the direction angle of the base station antenna covering the cell and/or the direction angle of the base station antenna covering the adjacent cell of the cell as an input parameter for coverage self-optimization, adjusting the input parameter according to a preset sixth angle adjustment amplitude value to reduce the overlapping coverage area of the base station antennas of the cell and the adjacent cell, and taking the adjusted parameter as an output parameter for coverage self-optimization;

adjusting power related parameters of a reference symbol channel in the cell according to a preset third reference symbol power adjustment amplitude value, so that the transmitting power of the reference symbol in the cell is reduced;

adjusting power related parameters of an uplink service channel in the cell according to a preset third uplink power adjustment amplitude value, so that the transmission power of an uplink service signal of the UE in the cell is reduced;

adjusting the power related parameters of the downlink traffic channel in the cell according to a preset fifth downlink power adjustment amplitude value, so that the transmission power of the downlink traffic signal of the base station in the cell is reduced;

and adjusting the power related parameters of the downlink common channel in the cell according to a preset sixth downlink power adjustment amplitude value, so that the transmission power of the downlink common signal of the base station in the cell is reduced.

9. The method of claim 6 or 7 or 8, wherein the power related parameters of the uplink traffic channel comprise:

the power level of the UE, the uplink power control parameter, and the uplink interference tolerance IoT threshold value.

10. The method of claim 6, 7 or 8, wherein the power related parameters of the downlink traffic channel comprise: broadcasting control channel BCH power and downlink shared channel DSCH downlink power control parameters;

the power related parameters of the downlink common channel comprise: the paging channel PCH power.

11. A system for coverage self-optimization, the system comprising:

12. The system of claim 11, further comprising:

user equipment for determining that a radio link of an air interface has failed; acquiring the geographical location information of the UE when the failure occurs and/or the geographical location information of the UE when the failure recovers; after the failure recovery, reporting the obtained geographical position information to the coverage problem detection equipment;

the coverage problem detection device is configured to:

and determining the position of the cell with the coverage hole according to the received geographical position information and/or the geographical position information acquired by the user equipment when the user equipment is in the failure recovery.

13. The system of claim 11, wherein the coverage self-optimization device and the parameter adjustment performing device are disposed on a common physical entity or are located on different physical entities.

14. An overlay self-optimizing device, the device comprising:

15. The apparatus of claim 14, further comprising:

and the sending unit is used for sending the parameter adjusting strategy determined by the adjusting strategy determining unit to external parameter adjusting and executing equipment.

16. The apparatus of claim 14, further comprising:

and the parameter adjustment executing unit is used for adjusting the relevant parameters of the cell according to the parameter adjustment strategy determined by the adjustment strategy determining unit.

17. A parameter adjustment execution apparatus, characterized by comprising:

18. The apparatus of claim 17, wherein the parameter adjustment performing unit comprises one or any combination of the following six units:

19. The apparatus of claim 17, wherein the parameter adjustment performing unit comprises one or any combination of the following six units:

20. The apparatus of claim 17, wherein the parameter adjustment performing unit comprises one or any combination of the following six units: