CN1984420A - Method for inspecting guide-frequency pollution - Google Patents

Abstract

The invention discloses a method for detecting pilot frequency pollution. The method includes: setting an absolute threshold and a relative threshold, and a radio network controller RNC receives a measurement report including parameters that can reflect whether pilot frequency pollution is reported by a user equipment UE; records Measure the cell ID and its corresponding RSCP in the report; judge whether the RSCPs of the cells in the record are all greater than the absolute threshold, and whether the difference between the maximum RSCP and the minimum RSCP is not greater than the relative threshold, if yes, output the Included cell ID; otherwise, end the current processing flow. The method provided by the invention can make full use of the UE's own mechanism for reporting measurement reports, and realize automatic detection of pilot pollution with low cost and high efficiency.

Description

A pilot pollution detection method

technical field

The invention relates to detection technology, in particular to a pilot pollution detection method.

Background technique

In the network, due to network planning problems such as site layout or topography and other reasons, there may be multiple cells with strong signals in some areas at the same time, and the areas covered by these cells are areas where pilot pollution may exist. It is generally believed that there are more than 3 cells with RSCP (Received Signal Code Power) greater than -95dB in the pilot pollution area, and the difference between the RSCP of the cell with the strongest signal and the cell with the weakest signal does not exceed 5dB. In addition, according to different understandings of pilot pollution, pilot pollution can be defined differently. For example, a cell with more than 3 RSCPs greater than -90dB can be considered as a pilot pollution area, or a cell with more than 4 RSCPs can be considered as a pilot pollution area. Cells greater than -90dB are considered pilot pollution areas, etc. In short, pilot pollution areas are areas covered by multiple cells with strong signals.

Pilot pollution will bring many problems to the network, such as poor coverage, easy call drop in the pilot pollution area, and difficult access, etc. These problems directly affect the performance of the network, so it is necessary to eliminate them as much as possible during the network optimization process. Areas of pilot contamination.

At present, the drive test method is usually used to detect pilot pollution in network optimization. The drive test method is to use the drive test instrument to enter the actual network to collect the RSCP of all the cells that can be received in certain areas on the drive test route, and then The collected data is calculated, analyzed and judged to find points where pilot pollution may exist.

Using the existing drive test method to detect pilot pollution, since it is necessary to drive or walk to the actual network site to collect data with the drive tester, the workload of the drive test is large, the cost is high, and the efficiency is low; in addition, due to The areas where drive tests can be performed are limited, and it is unrealistic to conduct drive tests in many areas, such as small roads or indoors. Therefore, the area that can be covered by the existing drive test methods to detect pilot pollution areas is relatively small.

Contents of the invention

In view of this, the present invention provides a pilot pollution detection method, which can realize the detection of pilot pollution at low cost and high efficiency, specifically including: setting an absolute threshold and a relative threshold, and the radio network controller RNC receives the user equipment After the UE reports the measurement report including parameters that can reflect whether pilot pollution occurs, the method includes:

A. Record the cell identification ID and its corresponding received signal code power RSCP in the measurement report;

B. Determine whether the RSCPs of the cells in the record are all greater than the absolute threshold, and whether the difference between the maximum RSCP and the minimum RSCP is not greater than the relative threshold, if yes, output the cell ID contained in the record; otherwise, end the current processing flow .

The measurement report is a 1C measurement report.

Said step B may comprise:

B1. Group the records with the same cell ID into one group, and set a counter for each group;

B2, judge whether the RSCP of the sub-district in the current record of current group is all greater than the absolute threshold, and whether the difference between the maximum RSCP and the minimum RSCP is not greater than the relative threshold, if yes, add 1 to the counter, and then perform step B3; otherwise , directly execute step B3;

B3. Determine whether all the records of the current group have been compared, if yes, execute step B4; otherwise, use the next record of the current group as the current record, and return to execute step B2;

B4. Determine whether all the groups have been compared, if yes, output the cell ID of each group and the value of the counter corresponding to the group; otherwise, use the next group as the current group, and return to step B2.

The UE periodically reports the 1C measurement report, and the step A may be: in the periodically reported 1C measurement report, select a record with the strongest RSCP of the cells in the monitoring set.

The recording in step A may further include: recording the 1C report identifier, the 1C report time and/or the interference intensity Ec/I ₀ corresponding to the cell.

The recording in step A may further include: recording the cell ID of the optimal cell. After the step B, the method may further include: judging whether the output multiple records including the same cell ID all include the optimal cell ID, and if so, excluding the possibility that the area is used as a pilot pollution area; Otherwise, end the current processing flow.

Before the step A, the method may further include: after receiving the 1C measurement report reported by the UE, the RNC starts positioning measurement for the UE, and records the positioning measurement result reported by the UE.

As can be seen from the above scheme, the pilot pollution detection method provided by the present invention has the following beneficial effects:

1. The method provided by the present invention does not require inspection personnel to drive or walk to the network site to collect data, but makes full use of the mechanism of user equipment reporting 1C events to automatically obtain the RSCP and other data required for detecting pilot pollution in the 1C measurement report, Therefore, the method provided by the present invention has high efficiency, saves the cost of detecting pilot pollution, thereby also saving the cost of network optimization;

2. Since the present invention uses the 1C measurement report reported by the user equipment, it is not limited by small roads or indoors, and has a large coverage;

3. The present invention utilizes user equipment to fully detect pilot pollution areas that may exist for users, which is simple, easy to implement, and relatively practical.

Description of drawings

Fig. 1 is a flowchart of a pilot pollution detection method according to an embodiment of the present invention.

Detailed ways

In order to make the features and advantages of the present invention clearer, the present invention will be further described below with reference to the accompanying drawings in conjunction with specific embodiments, and the present invention only takes the 1C measurement report reported by a user equipment (UE, User Equipment) in a WCDMA network as an example. illustrate.

Usually in a WCDMA network, when a user equipment establishes a call, the radio network controller (RNC, Radio Network Controller) will issue measurement control, and the measurement control issued by the RNC can require the UE to report various events, such as 1C events, 1C events are It means that the signal of the common pilot channel (CPICH) of an inactive set is better than that of the CPICH of an active set. According to the characteristics of 1C events, the 1C measurement report corresponding to the 1C event includes whether the corresponding area is a pilot Parameters of the polluted area, such as RSCP of cells in the active set, RSCP of cells in the monitoring set and/or detection set. While delivering the measurement control, the RNC configures the UE to report to the RNC the signal quality of the cell including the interference intensity (Ec/I ₀ ) and RSCP and the cell scrambling code number of the active set and the monitoring set. A collection of cells that support UE calls. The monitoring set is a collection of other candidate cells that can support UE calls. The cells in the monitoring set are adjacent cells to the cells in the active set. The active set and the monitoring set are notified to the UE by the RNC during configuration. And because the UE moves during the call, the monitoring set may be converted into the active set at any time, and the active set may also be converted into the monitoring set. Therefore, when UE discovers 1C event through measurement, it will report 1C measurement report to RNC. According to the configuration performed by RNC when delivering measurement control, the measurement report may include all cell identities (IDs) in the active set and the corresponding Ec/ I ₀ and RSCP and the cell ID of the monitoring set and detection set and the corresponding Ec/I ₀ and RSCP, wherein the detection set is a set of candidate cells detected by the UE itself that can support UE calls, and the detection set can be converted into A collection of cells in an active set or a monitoring set.

The main idea of this embodiment is to use the 1C measurement report reported by the UE to analyze the cell and its corresponding RSCP in the measurement report according to the conditions of pilot pollution, so as to realize the detection of pilot pollution.

Specifically, referring to Fig. 1, at first, set the threshold value used for judging that the pilot pollution condition is met: an absolute threshold and a relative threshold, here, the default value of the absolute threshold is -95dB, which is to judge whether the RSCP of a single cell satisfies Threshold of the pilot pollution condition, the cell whose RSCP is greater than the absolute threshold may have pilot pollution; the default value of the relative threshold is 5dB, which is the threshold for judging whether the difference between the RSCPs of two cells meets the pilot pollution condition, Pilot pollution may exist in the area where the difference between the maximum RSCP and the minimum RSCP is not greater than the relative threshold. According to the introduction of the background technology, it can be seen that there are more than 3 RSCPs greater than -95dB, and the area of the cell whose difference between the maximum RSCP and the minimum RSCP is not greater than 5dB can be considered as a pilot pollution area. In this embodiment, the absolute threshold is -95dB, and the relative threshold is 5dB as the condition for satisfying pilot pollution. In addition, these two thresholds can be modified according to different definitions of pilot pollution. The specific detection steps are as follows:

Step 101, recording the cell ID and its corresponding RSCP in the 1C measurement report reported by the UE;

After receiving the 1C reported by the UE, the RNC can input the event as a record into the log file, which includes: all cell IDs in the active set and their corresponding RSCPs in the 1C measurement report, and all cell IDs in the monitoring set and detection set The cell ID and its corresponding RSCP can further include the interference intensity Ec/I ₀ corresponding to all cells; in addition, many events and reports may be included in the log file. In order to distinguish the 1C measurement report from other event reports, you can also use The record input to the log file carries the 1C report identifier; preferably, it may also include the time when the 1C event was reported.

In addition, the records input into the log file may further include the cell ID of the optimal cell. The optimal cell is also called the dominant cell, which is maintained by the RNC and is the cell with the strongest signal in the active set, monitoring set, and detection set, that is to say , the RSCP of the optimal cell may exceed -95dB, and the difference with the RSCP of other cells does not exceed 5dB, so it is possible to meet the condition of pilot pollution. However, even if the condition of pilot pollution is met, but if If the optimal cell exists in multiple measurements of an area, then this area is not considered a pilot pollution area. The multiple measurements here can be set according to different understandings of the optimal cell and pilot pollution. For example, it is set to 5 times, so the optimal cell can be included in the log file, so as to provide a basis for the final judgment of the pilot pollution area. For example, when judging the pilot pollution area, if the area that meets the pilot pollution conditions includes There is an optimal cell, but the area that satisfies the pilot pollution condition in several times, for example, 5 detections includes the optimal cell, then it can be considered that this area is not a pilot pollution area, so that the cell can not be affected in network optimization. Optimized processing.

In addition, when the UE reports the 1C event, the RNC may not process or record the 1C event. Therefore, the UE may report the 1C event periodically. At this time, only the measurement report with the strongest RSCP in the monitoring set can be selected to be It is recorded in the log file, that is, the cell ID and its corresponding RSCP are only recorded once, instead of recording all the corresponding periodically reported contents one by one.

After step 101, multiple 1C events reported by multiple UEs will be respectively recorded in a log file, so multiple records are included in the log file.

Step 102, grouping records with the same cell ID into one group, and setting a pilot pollution counter for each group;

Take out all the records with 1C report logo from the log file, according to the cell ID in the record, whether it is the active set, monitoring set or detection set, they are all classified according to the cell ID, that is, the records with the same cell ID are grouped together For example, if the cell IDs in record 1 are A, B, C, and D, and the cell IDs in record 2 are B, D, C, and A, then these two records are regarded as a group, and each group may include Multiple records; set a pilot pollution counter for each group to count the times of pilot pollution, the initial value can be set to 0.

Here, a better implementation is to divide the records into several groups according to the cell ID, and then use the group as a unit to judge group by group according to the definition of pilot pollution. However, in actual implementation, it is also possible to directly Taking each record as a unit to judge one by one according to the definition of pilot pollution, the detection of pilot pollution can also be realized.

Step 103, judge whether the RSCPs of the sub-district in the current group current record are all greater than the absolute threshold, and whether the difference between the maximum RSCP and the minimum RSCP is not greater than the relative threshold, if yes, perform step 104; otherwise, perform step 105;

Here, the first record of the first group is used as the current record of the current group, and the first record of the last group can also be used as the current record of the current group, as long as all records of all groups can be judged in the end. .

Step 104, adding 1 to the pilot pollution counter;

Step 105, judge whether all records in the current group have been compared, if yes, execute step 106; otherwise, use the next record of the current group as the current record, and return to execute step 103;

Step 106, judge whether all groups have been compared, if yes, execute step 107; otherwise, use the next group as the current group, and return to execute step 103;

Step 107, outputting the cell ID of each group and the value of the counter corresponding to each group.

When all the groups are compared, the results can be output in a certain order, for example: output the results in the descending order of the pilot pollution counters, or in the ascending order of the pilot pollution counters, etc. The output results include the results of each group The cell ID may further include the value of the pilot pollution counter, and this result may be used as a basis for judging whether there is pilot pollution. For example, if there are 4 sub-districts in a certain group, there are 5 records about these 4 sub-districts, and the value of the pilot pollution counter is 5, then it can be explained that there may be pilot pollution in the areas covered by these 4 sub-districts. Provide basis for detection and network optimization.

When judging according to the definition of pilot pollution with each record as a unit, it is sufficient to output the cell ID and judgment result of each record.

In addition, in order to provide the specific location of the detection pilot pollution area, after the RNC receives the 1C measurement report, the RNC can further start the positioning measurement of the UE reporting the 1C event. After receiving the positioning measurement command, the UE will measure the specific location. The measured specific position is reported to the RNC, so the specific position reported by the UE can be recorded in the log file at the same time, and the specific position reported by the UE can be used as a basis for optimizing the pilot pollution point.

The above steps describe in detail the process of using the cell ID and its corresponding RSCP in the 1C measurement report reported by the UE to the RNC in the WCDMA network, and comparing and judging the RSCP in combination with the conditions of pilot pollution, so as to determine the pilot pollution area. It can be seen from the above steps that the method provided by the embodiment of the present invention makes full use of the UE's existing mechanism for reporting measurement reports to realize the collection of pilot pollution detection data, reduce the workload of road measurement, save costs, and can Including areas where pilot pollution may exist in the network, the coverage is wide.

The above has described the present invention in detail by taking the mechanism of using UE to report 1C events in the WCDMA network as an example. However, the methods and ideas provided by the present invention are also applicable to other networks, such as CDMA networks. Reports of measurements of frequently polluted parameters.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention.

Claims (8)

1, a kind of method for inspecting guide-frequency pollution is characterized in that, sets absolute thresholding and relative threshold, and after radio network controller (RNC) was received and can be reflected the measurement report of the parameter whether pilot pollution takes place comprising of reported by user equipment UE, this method comprised:

Cell ID ID in A, the measurement report records and corresponding received signal code power RSCP thereof;

B, whether judge sub-district RSCP in the record, and whether the difference between maximum RSCP and the minimum RSCP be not more than relative threshold, if export the sub-district ID that this record comprises all greater than absolute thresholding; Otherwise, finish current handling process.

2, method according to claim 1 is characterized in that, described measurement report is the 1C measurement report.

3, method according to claim 2 is characterized in that, described step B comprises:

B1, the record that sub-district ID is identical are classified as one group, and counter are set for each group;

B2, judge sub-district in current group the current record RSCP whether all greater than absolute thresholding, and whether the difference between maximum RSCP and the minimum RSCP be not more than relative threshold, if counter is added 1, again execution in step B3; Otherwise, direct execution in step B3;

B3, judge whether all records of relatively intact current group, if, execution in step B4; Otherwise, next bar record of current group as current record, is returned execution in step B2;

B4, judge whether relatively intact all groups, if export the value of the counter of the sub-district ID of each group and this group correspondence; Otherwise, next group as current group, is returned execution in step B2.

4, according to claim 2 or 3 described methods, it is characterized in that UE periodically reports the 1C measurement report, described steps A is:

In the 1C measurement report that periodically reports, select to monitor the strongest once record of collection sub-district RSCP.

According to claim 2 or 3 described methods, it is characterized in that 5, record further comprises described in the steps A:

Call time and/or the pairing interference strength Ec/I in sub-district on record 1C report sign, the 1C ₀

According to claim 2 or 3 described methods, it is characterized in that 6, record further comprises described in the steps A:

The sub-district ID of record optimum subdistrict.

7, method according to claim 6 is characterized in that, after described step B, this method further comprises:

Judge in many records of being exported that comprise same cells ID whether all comprise optimum subdistrict ID, if then get rid of the possibility of this zone as the pilot pollution zone; Otherwise, finish current handling process.

8, method according to claim 2 is characterized in that, before described steps A, this method further comprises:

After RNC receives the 1C measurement report that UE reports, start location survey, the positioning measurement result that record UE reports to UE.

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