TWI806573B - Method for detecting and suppressing mobile network interference - Google Patents

Abstract

A method of detecting and suppressing mobile network interference, comprising: dynamically receiving a key performance indicator (KPI) associated with an area, the KPI being generated based on the detection of a plurality of base stations in the area; Identifying that the area is interfered based on the KPI being greater than a threshold; in response to identifying that the area is interfered, identifying one or more base stations that are interfered in the area based on a first condition or a second condition , wherein the first condition and the second condition are respectively defined by an interference value and a physical resource block (PRB, Physical Resource Block) percentage; and based on at least the interfered base station identified in the area, determine Modify the parameters of the base station.

Description

Method for detecting and suppressing mobile network interference

The present invention relates to a method of monitoring mobile network quality, in particular to a method for detecting mobile network interference and suppressing the interference.

There are many factors that interfere with LTE mobile networks of telecom operators, among which the interference caused by external signals with similar frequencies is one of the common factors. For example, the LTE mobile network of Taiwan Mobile includes 700 frequency band (L700), 1800 frequency band (L1800) and 2100 frequency band (L2100). Among them, the 700 frequency band (L700) mobile network has the longest transmission distance, but it is also the easiest Interference from external signals (not from Taiwan Mobile) caused a relatively high customer complaint rate in this frequency band. After investigation, the interference of the 700 frequency band (L700) mainly comes from the interference of military signals, which accounts for 90% of the overall customer complaints.

Figure 1 shows a schematic diagram of mobile network users being affected by interference in the mobile network frequency band. One or more base stations (1) of the telecommunication provider provide mobile networks with 700 frequency bands (L700), 1800 frequency bands (L1800) and 2100 frequency bands (L2100). In the absence of external signal interference, the Internet speed and network stability of mobile Internet users (2) covered by the 700-band (L700), 1800-band (L1800) and 2100-band (L2100) are in line with user expectations . Once interfered by external signals, such as the 700 frequency band, the network quality of the mobile network users (2) close to the base station center range (3) remains unaffected, and the mobile network users far away from the base station center range (3) The network quality of road user (2) is obviously degraded.

The second figure is an existing solution to the above problems, including steps S20 to S26. In step S20, the monitoring system dynamically collects all base station data, especially relevant data that can be used to judge or reflect whether the base station is interfered by signals. In step S21, the monitoring system determines whether a key performance indicator (KPI) associated with base stations in an area exceeds a predetermined threshold. For example, the estimated interference power or interference value associated with a certain administrative region (or township, town) is obtained, and it is judged whether the value of the estimated interference power is greater than an energy threshold, -105dBm. If the key performance indicator is less than the threshold value, then enter step S22, and after a period of time (for example, automatically every hour) execute the judgment of steps S20 to S21. If the key performance indicator is greater than the threshold, go to step S23. The monitoring system generates a report based on the regional data greater than the threshold value and sends it to the network maintenance unit for personnel to analyze the information described in the report. In step S24, the personnel identify base stations that may be interfered with in the area according to the report information, and determine the modification parameters of the interfered base stations based on their own technical knowledge. In step S25, relevant personnel then modify the parameters of the target base station based on the modified parameters determined in the preceding steps.

As a result of the modification, the affected mobile users are transferred from the affected frequency band to the undisturbed frequency band through a handover mechanism. Taking the first figure as an example, the edge users of the interfered 700 frequency band (L700) can be hand-handled to the 1800 frequency band (L1800) or 2100 frequency band (L2100), while the central users of the 700 frequency band (L700) remain in the original frequency band. This reduces the number of affected users in the 700 band (L700).

Such a solution has certain drawbacks. The aforementioned monitoring system only generates a list of base stations that may be interfered with based on a single interference index (that is, whether the estimated interference energy is greater than the threshold), and then personnel further identify the base stations that may be interfered with from the reports provided by the monitoring system based on empirical rules. As a result, users at the edge of the frequency band may not be hand-handled to other frequency bands, or users at the center of the base station may be misjudged as edge users and hand-handled to other frequency bands. Furthermore, since the identification of the interfering base station and the decision to modify the parameters of the base station are usually performed manually by the personnel of the maintenance and operation unit, Unable to cope with the tens of thousands of base stations in Taiwan, it is really impossible to identify all interference events in real time, let alone immediately correct the parameters of the interfered base stations.

Therefore, it is necessary to develop technical means for detecting and suppressing interference with more accurate judgment and better correction efficiency.

One of the objectives of the present invention is to adjust the parameters of the base station in response to interference events. Taking the first picture as an example, adjust the 700 frequency band (L700) so that users at the edge of the cell handover to the 1800 or 2100 frequency band (L1800/2100), while the users at the 700 frequency band (L700) cell center remain in the original frequency band, thereby reducing The number of users who interfere with the full frequency of the 700 frequency band (L700). The technical means of suppressing interference in the present invention is achieved by modifying the parameters of the base station, covering the severely interfered physical resource blocks in the frequency band, so as to prevent users from using the cell frequency band with poor quality.

The present invention provides a method of detecting and suppressing mobile network interference, comprising: dynamically receiving a key performance indicator (KPI) associated with an area, the KPI being based on the detection of a plurality of base stations in the area Generated; based on the key performance indicator being greater than a threshold value, identifying that the area is disturbed; in response to identifying that the area is disturbed, identifying one or more disturbed areas in the area based on a first condition or a second condition base stations, wherein the first condition and the second condition are respectively defined by an interference value and a physical resource block (PRB, Physical Resource Block) percentage; at least based on the identified interfered base stations in the area , to determine the parameter modification of the base station.

In a specific embodiment, the KPI indicates the interference value of the area, and the threshold value is -105dBm.

In a specific embodiment, the first condition indicates that the interference value of the base station is greater than -100dBm and the interfered physical resource block of the base station is less than 25%, the second condition indicates that the interference value of the base station is greater than -96dBm and the base station The disturbed physical resource blocks are greater than or equal to 25%.

In a specific embodiment, the parameter modification is used for masking a first frequency band of the mobile network, and in response to the masking, some users of the first frequency band are not masked in the first frequency band A handshake is performed with a second frequency band of the mobile network, so as to prevent the user from using the interfered frequency band.

In one embodiment, the method further includes: determining parameter modification of one or more base stations based on the interfered base station in the area and the category of the interfered base station. Wherein, the type of the base station is determined according to the load level of the base station, interfered frequency or geographical area.

In a specific embodiment, the method further includes: checking the parameters of the current base station at least based on the original parameters of the base stations in the area to determine whether the parameter modification of the base station is successful.

In an embodiment, the method further includes: returning the one or more base stations to an original state based on the original parameters in response to the disappearance of the interference of the one or more base stations in the area.

In a specific embodiment, the method further includes: based on identifying one or more interfered base stations in the area, generating a list, the list includes at least the identification time, one or more interfered base station codes, one or more The location of one interfered base station and the interference value of one or more interfered base stations.

In a specific embodiment, the method further includes: based on the base station codes in the list, obtaining the original parameters of one or more interfered base stations in the area, as a subsequent confirmation of whether the parameters are modified successfully and returning to the original state The basis of the state table.

In a specific embodiment, when the user is in the idle mode (idle), based on the interference value of the second frequency band being greater than -112dBm, the user handhands from the first frequency band to the second frequency band; or based on the interference value of the first frequency band If the interference value is greater than -102dBm, the user is handshaking from the second frequency band to the first frequency band.

In a specific embodiment, when the user is in the connection mode (connected), based on the interference value of the second frequency band being less than -116dBm, the user handovers from the second frequency band to the first frequency band; or based on the interference value of the first frequency band If the interference value is less than -105dBm, the user is handshaking from the first frequency band to the second frequency band.

Accordingly, compared with the prior art, the present invention not only solves the low efficiency of manual judgment, but also solves the problem of the accuracy of judging interference events by only a single index and rule of thumb in the prior art. The present invention proposes a comprehensive interference index to accurately determine base stations affected by interference.

The foregoing and other aspects of the invention will become more apparent from the following detailed description of non-limiting specific examples and with reference to the accompanying drawings.

1: base station

2: user

3: Center range of the base station

4: Monitoring system

5: Identification system

6: Execution system

L700, L1800, L2100: frequency band

S20-S26: Steps

S30-S38: Steps

Figure 1 shows a schematic diagram of mobile network users being affected by interference in the mobile network frequency band.

Figure 2 shows a conventional method for detecting and suppressing mobile network interference.

The third figure shows the method of detecting and suppressing mobile network interference of the present invention.

The third figure shows the method of detecting and suppressing mobile network interference of the present invention. The method is jointly executed by the monitoring system (4), the identification system (5) and the execution system (6), but the present invention is not limited thereto. It should be understood that the monitoring system ( 4 ), identification system ( 5 ) and execution system ( 6 ) can be individually distributed servers at different locations in the network, or individually constituted by multiple servers. The monitoring system (4) is mainly configured to receive relevant data of the base station and perform preliminary judgment. The identification system (5) receives the data provided by the monitoring system (4) for further judgment. The execution system (6) is mainly configured to integrate relevant data and issue instructions to the base station or a remote control system that controls the base station.

The method of the present invention starts at step S30, the monitoring system (4) dynamically receives data from the base station. The dynamic receiving refers to receiving at intervals, such as fifteen minutes. Specifically, the monitoring system (4) is configured to receive data from one or more base stations in units of regions, such as an administrative region, township or town. The monitoring system (4) obtains key performance indicators (KPIs) related to an area from the received data, such as estimated interference power (Estimated interference power), referred to as the interference value in this paper, which is used as an indicator of the interference degree of the overall mobile network in the area. refer to.

In step S31, the monitoring system (4) judges whether the current base station key performance index (ie KPI) exceeds a preset threshold, thereby determining whether an area is currently subject to large-scale interference. Specifically, the monitoring system (4) judges whether the interference value associated with an area is greater than -105dBm. The area interference value in the present invention is the interference value obtained by gathering the interference values of all base stations in the area. When the interference value of the area is greater than -105dBm, the area is considered to be subject to large-scale interference (like the edge interference of the frequency band 700 in the first figure), and step S32 is entered. When the interference value of the area is less than -105dBm, the area is regarded as not subject to large-scale interference, and step S33 is entered.

In step S32, the identification system (5) identifies the state of the base station as "normal" and "parameter to be modified" according to a first condition and a second condition. Once an area is judged as large-scale interference, such as the 700 frequency band (L700) in the first figure, the identification system (5) further judges the interference values of all base stations in the area one by one. The identification system (5) compares the interference value measured by each base station in the area with the first condition and the second condition. When the data detected by the base station satisfies the first condition or the second condition, it is determined that the base station is interfered, and the status of the base station is adjusted to "parameters to be modified", as shown in the first figure 700 frequency band (L700) base station. On the contrary, if the base station is not disturbed or the degree of interference is not enough to affect the mobile network quality, adjust the status of the base station to "normal".

The first condition or the second condition is defined by two factors, an interference value of a base station and a physical resource block (PRB). In this embodiment, the first condition is that the base station interference value is greater than -100dBm and the physical resource block is less than 25%, and the second condition is that the base station interference The interference value is greater than -96dBm and the physical resource block is greater than or equal to 25%. When the interference value of the base station is greater than -100dBm and the interfered physical resource block is less than 25% of the whole, or when the interference value of the base station is greater than -96dBm and the interfered physical resource block is greater than or equal to 25% of the whole , the base station is considered to be interfered, and the parameters need to be modified to reduce the number of affected users.

In step S34, the identification system (5) eliminates the base stations judged as "normal", and collects the base stations judged as "parameters to be modified" to generate a modification list. For example, the modification list may at least describe the interference start time of the base station, the name of the base station, the location of the base station, the area to which the base station belongs, and the interference value of the base station, etc., but the present invention is not limited thereto.

The identification system (5) can be configured to further exclude base stations with "parameters to be modified" based on other conditions, such as base station types. The type of the base station may be determined according to the load level of the base station, the interfered frequency or the geographical area, but the present invention is not limited thereto. In another embodiment, the identification system (5) can be further configured to take the "parameters to be modified" into The base station gives the interference level as a reference for modifying the parameters.

In step S35, the execution system (6) receives the modification list, and obtains the original parameters of these base stations from a remote management system according to the base stations described in the modification list. The remote management system stores the original parameters of all base stations, such as the original parameters of base stations in three frequency bands (L700, L1800, L2100) in the first figure. The original parameters are those of the normal operation of the undisturbed base station. The execution system (6) stores the original parameters of the base station in these frequency bands, which can be used to judge whether the parameter adjustment is successful. In one embodiment, if the modification list describes a base station in the 700 frequency band (L700), the execution system (6) obtains related objects of the L700 base station from the remote management system, including LNCEL, IRFIM, LNHOIF and/or LNCEL_FDD, and Some numerical values are obtained therefrom as original parameters, but the present invention is not limited thereto. In addition, although other frequency band base stations (such as L1800 and L2100) are not described in the modification list, the execution system (6) can still obtain other frequency band base stations from the remote system. The original parameters of the base station, such as including but not limited to LNCEL, SIB and/or IRFIM, etc., so that base stations in other frequency bands can be modified together in subsequent steps to support users in the interfered frequency band. As shown in the first figure, although the 1800 and 2100 frequency bands (L1800, L2100) are not subject to interference, they can still support marginal users of the 700 frequency band (L700) through the handshake mechanism, so the 1800 and 2100 frequency bands can be properly adjusted by parameters.

In step S36, the execution system (6) executes parameter modification of the relevant base stations according to the modification list. The parameter modification is mainly to shield the physical resource block of the interfered frequency band through a shielding means, so as to prevent the user from using the frequency band with poor quality. The execution system (6) generates a modification target according to the interference base station listed in the modification list and the corresponding interference value, and executes the parameter modification of the base station according to the modification target. The following table shows an example of the modification target, including base station management object classification (MOC, Managed Object Class) and its corresponding parameter name and target value.

In response to the parameter modification of the base station, some users can transfer between different frequency bands of the mobile network through the handshaking mechanism. Take the first figure as an example, for the interfered mobile network 700 frequency band (L700), according to the aforementioned interference identification steps and parameter modification steps, the interference in the 700 frequency band can be Some serious physical resource blocks are covered to prevent users from using poor-quality cell frequency bands. Also take the first picture as an example, after the L700 has been masked, when the user device (such as a mobile phone) operates in idle mode and wants to reselect a frequency band with better quality, if the cells of the L1800 or L2100 interfere If the value is greater than -112dBm, some L700 users can be handed over to L1800 or L2100 cells; if the L700 cell interference value is greater than -102dBm, some L1800 or L2100 users can be handed over to L700 cells. When the user device operates in the connected mode and wants to reselect a frequency band with better quality, if the cell interference value of the L700 is less than -105dBm, some users of the L700 can be handed over to the cells of the L1800 or L2100; If the cell interference value of L1800 or L2100 is less than -116dBm, some users of L1800 or L2100 can be handed over to the cell of L700.

In step S37, after modifying the parameters, the execution system (6) determines whether the parameter modification of the base station is successful according to the original parameters. Specifically, the execution system (6) obtains the modified parameters of the current base station from the remote management system, and compares them with known original parameters. If the parameters of the current base station after modification are indeed changed compared with the original parameters, it means that the modification is successful. On the contrary, it means that the modification failed. The execution system (6) can generate a failure list in response to the modification failure for relevant units to further find out whether the base station or the data transmission equipment is faulty.

In step S38, the execution system (6) restores the relevant base station to the original state according to the original parameters of the base station in response to the interference disappearing. In one embodiment, the monitoring system (4) continuously monitors the key performance indicators of an area, and when the interference value of an area fails to meet the condition of greater than -105dBm for two hours, the execution system (6) is instructed to start the recovery process. The execution system (6) generates a recovery target according to the original base station parameters retained during the parameter modification process, and the execution system (6) executes parameter recovery according to the recovery target. In addition, the execution system (6) can generate a modification history (record base station parameter history) according to the modification list and the modification target, for confirmation and reference of the modification result and reply result.

However, it should be understood that the various specific embodiments of the present invention are only used for illustration, and various changes can be made without departing from the scope and spirit of the patent application of the present invention, and all should be included in the patent scope of the present invention. Therefore, the specific embodiments described in this specification are not intended to limit the present invention, and the true scope and spirit of the present invention are disclosed in the following claims.

S30-S38: Steps

Claims (11)

A method of detecting and suppressing mobile network interference, comprising: dynamically receiving a key performance indicator (KPI) associated with an area, the KPI being generated based on the detection of a plurality of base stations in the area; Identifying that the area is interfered based on the KPI being greater than a threshold; in response to identifying that the area is interfered, identifying one or more base stations that are interfered in the area based on a first condition or a second condition , wherein the first condition and the second condition are respectively defined by an interference value and a physical resource block (PRB) percentage; and determining base station parameters based at least on the identified interfered base stations in the area Revise. The method as claimed in claim 1, wherein the KPI indicates the interference value of the area, and the threshold value is -105dBm. The method as described in claim 1, wherein the first condition indicates that the interference value of the base station is greater than -100dBm and the physical resource blocks interfered with by the base station are less than 25%, and the second condition indicates that the interference value of the base station is greater than -96dBm In addition, the interfered physical resource blocks of the base station are greater than or equal to 25%. The method as described in claim 1, wherein the parameter modification is used to mask a first frequency band of the mobile network, and cause the first frequency band to be masked in response to the masking Some users perform a handshake between the unshielded part of the first frequency band and a second frequency band of the mobile network, so as to prevent the users from using the interfered frequency band. The method as described in claim 1, further comprising: determining parameter modification of one or more base stations based on the interfered base station and the category of the interfered base station in the area, wherein the category of the base station is based on the base station Depending on the load level of the station, the frequency of interference or the geographical area. The method as described in claim 1 further includes: checking the parameters of the current base station at least based on the original parameters of the base station in the area, so as to determine whether the parameter modification of the base station is successful. The method as claimed in claim 6 further includes: returning the one or more base stations to an original state based on the original parameters in response to the disappearance of the interference of the one or more base stations in the area. The method as described in claim 1, further comprising: generating a list based on identifying one or more interfered base stations in the area, the list at least including identification time, one or more interfered base station codes, one or A plurality of interfered base station locations and one or more interfered base station interference values. The method as described in claim item 8 further includes: Based on the code of the base station in the list, the original parameters of one or more interfered base stations in the area are obtained, as a basis for subsequent confirmation of the success of modifying the parameters and restoring the base station to its original state. The method as described in claim item 4, wherein when the user is in idle mode (idle), based on the interference value of the second frequency band being greater than -112dBm, the user handovers from the first frequency band to the second frequency band; or based on the second frequency band The interference value of a frequency band is greater than -102dBm, and the user handovers from the second frequency band to the first frequency band. The method as described in claim 4, wherein when the user is connected, based on the interference value of the second frequency band being less than -116dBm, the user handovers from the second frequency band to the first frequency band; or based on the second frequency band The interference value of a frequency band is less than -105dBm, and the user handovers from the first frequency band to the second frequency band.

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