KR100668528B1 - Method for managing Neighbor List and Recording Media Storing Program emboding the same - Google Patents

Abstract

The present invention relates to a method for managing a neighbor list (Neighbor List) and a recording medium storing a program including the same. PN offsets that reject the handoff due to the absence of neighboring base station list and the sum of the count data (Not Ngbr statistics) by the PN offset, and output the number of objective handoff attempts and ranks. And outputting the ratio of attempts to the output PNs against the average value of the handoff attempts of the top 5 and 10 PNs, and Calculate the rank difference with the neighboring base station list currently input into the system, and proceed to the step of determining the neighboring base station to be adjusted, deleted, or added by comparing the neighboring base station list of the current system with each step. By detecting the state of neighboring base station list and preparing the optimal neighboring station list to prepare for the changing wireless environment, it is possible to ultimately improve the call quality.

Neighbor List, Hand Off, PN Offset

Description

Method for managing neighboring base station list and recording medium storing program containing same {Method for managing Neighbor List and Recording Media Storing Program emboding the same}             

1 is a diagram showing an example of PNHO statistics of the present invention;

FIG. 2 is a diagram showing an example of Not Neighbor statistics of the present invention; FIG.

3 is a view showing the basic form of the tool of the present invention,

4 is a flowchart illustrating a method for managing a neighboring base station list according to an embodiment of the present invention;

5 is a view showing the execution result of the tool of the present invention;

6 is a diagram showing an example of neighbor base station list optimization for detecting an unnecessary neighbor base station as a first embodiment of the present invention;

7 is a view showing the results of attempting the opposite direction (Cheonan Sunghwan BETA) analysis in order to confirm whether the neighboring base station is unnecessary in the first embodiment of the present invention,

8 is a diagram illustrating an example of neighbor base station list optimization for detecting a missing neighboring station as a second embodiment of the present invention;

9 is a view showing the results of attempting the opposite direction (Cheonan Baekseok 1GAMMA) analysis to confirm the addition of the adjacent base station in the second embodiment of the present invention.

The present invention relates to a method for managing a neighboring base station list and a recording medium storing a program including the same. More specifically, the present invention compares statistical data reflecting the number of handoff attempts by PN and a current neighboring base station list. The present invention relates to a method for managing a neighboring base station list for determining a neighboring base station to perform deletion, priority adjustment, and the like, and a recording medium storing a program including the same.

In a CDMA system, a neighbor list is a system parameter input for each base station. Since it is inefficient for the terminal to handoff (move to the next base station) all hundreds of PN offsets (codes that distinguish the base stations) using only the PN Searcher (base station signal searcher) of the terminal, Each base station transmits a list of up to 20 PN offsets of neighboring stations in advance. The terminal searches the PN offset with reference to this list, allowing for fast and efficient handoff. As such, the neighbor base station list is important information including the neighbor base stations for handoff of the terminal.

However, if the neighboring base station list parameter is incorrectly input to the base station, the terminal may not be handed off and the call is disconnected or handoff is delayed when moving from any base station to the next base station. It will act as a factor to deteriorate the quality.

As such, the management of the neighboring base station list related to the call quality is one of the important factors, and various methods have been proposed to perform the optimization. For example, in the conventional neighbor base station list optimization method, a method of managing a neighboring base station list by referring to a service direction of a neighboring local area located within a local coverage or by a field drive test has been proposed.

However, these proposed methods are inefficient, such as time consuming, and have limitations in that they are not suitable in consideration of a wireless environment that changes frequently.

Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art, and includes PNHO statistics and Not Neighbor statistics and PNHO statistics reflecting the actual number of handoff attempts (PNHO) by PN. A neighboring base station that compares and determines a neighbor list, determines neighboring base stations to be added, neighboring base stations to be deleted, and neighboring base stations to be prioritized on the current neighboring base station list to perform more efficient neighbor base station list management and optimization. To provide a list management method.

Meanwhile, another object of the present invention is to provide a method of managing a neighboring base station list for comparing and determining PNHO statistics reflecting the actual handoff attempts by PN, Not Neighbor statistics, and the current neighboring base station list. It is to provide a recording medium containing the stored program.

One aspect for achieving the above object of the present invention,

a. Statistical data that adds together the counts of the neighboring PN offsets requesting handoff and its count (PNHO statistics), plus the counts of all the PN offsets that requested handoff but declined by the system due to the absence of a neighboring base station list. Summing and outputting statistical data (Not Ngbr statistics) and sorting the ranking data by the number of trials for each PN;

b. outputting a ratio of the number of attempts to the arranged PNs against the mean number of attempts of the top 5 or 10 attempts among the data generated from a;

c. outputting a rank difference between the data generated from b and the neighboring base station list of the current system;

d. If the PNs in the neighboring base station list exist simultaneously in the two statistical data (a PNHO statistics and the Not Ngbr statistics) of a, outputting the PNs of the neighboring base station list in priority order.

e. A. b. And comparing the step with the system neighbor base station list to determine the neighbor base station to be prioritized, deleted or added.

And a method for managing a list of neighboring base stations that includes.

On the other hand, another aspect for achieving the object of the present invention,

a. Statistical data that adds together the counts of the neighboring PN offsets requesting handoff and its count (PNHO statistics), plus the counts of all the PN offsets that requested handoff but declined by the system due to the absence of a neighboring base station list. Summing and outputting statistical data (Not Ngbr statistics) and sorting the ranking data by the number of attempts for each PN;

b. a function of outputting the ratio of the number of attempts to the PNs arranged against the average number of attempts of the top 5 or 10 PNs among the data generated from a;

c. A function that outputs a rank difference between the data generated from b and the neighbor base station list of the current system.

d. If two PNs (a PNHO statistics and Not Ngbr statistics) of a exist simultaneously in the PN in the neighboring base station list, the PN in the neighboring base station list is outputted with a higher priority.

e. A. b. And compares and compares the steps with the system neighbor base station list to determine the neighbor base station to be adjusted, deleted or added in order of priority.

It relates to a computer-readable recording medium that records a program that can be executed, including.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

According to the present invention, PNHO statistics reflecting actual Pseudo Noise Hand Off attempts (hereinafter referred to as “PNHO”), Not Neighbor statistics, and the current Neighbor List. It will be used to describe them sequentially.

1 is a diagram showing an example of PNHO statistics of the present invention. Referring to FIG. 1, neighboring base station PNs generating handoff attempts with the Cheonan Stability 3 base station may be identified for each attempt.

This is the number of times when the terminal raises the PN offsets in the neighbor base station list of the system in the PSMM (Pilot Strength Measurement Message) under the condition that all the terminals distributed in the corresponding base station sector request addition to the base station. Counted statistics. That is, it is statistical data that adds together the count and the peripheral PN offsets requesting handoff.

In this case, when the PSMM searches other base station PNs having a valid strength in addition to the base station signal currently being used for communication, the PSMM determines the handoff of the PN and the strength of the searched base station in order to determine whether the handoff is performed. Is a message for transmitting to a base station currently in a call.

FIG. 2 is a diagram illustrating an example of Not Neighbor statistics of the present invention. Referring to FIG. 2, base station PNs attempting a handoff with the Cheonan Stability 3 base station but not in the neighboring base station list can be checked by the number of attempts.

This is basically the same as the PNHO statistics collection method, but when the terminal raises PN offsets that are not in the neighbor base station list of the system among the PSMMs in which all terminals distributed in the sector of the base station request to add to the base station , The PN offsets and the count are the sum of the statistical data. In other words, it is statistical data that adds together the count and PN offsets that request a handoff but the system rejects the handoff due to the absence of an adjacent base station.

3 is a view showing the basic form of the tool of the present invention. As shown in FIG. 3, the PNHO statistics for each base station, the Not Ngbr statistics for each base station, and the current system neighbor for each base station can be input to input basic input data for using the neighbor base station list optimization tool. The base station list data entry sheet (Sheet) is classified.

Enter the data in the input sheet of each name under the tool, go to the result sheet, click “Load data” and select the base station and sector in the combo box, respectively. The result of determining the local neighbor base station list is summarized and output.

In the present embodiment, the programming using Excel Visual Basic is used to automatically compare and analyze these two data (PNHO statistics by base station, Not Ngbr statistics by base station) and the neighbor base station list of the current system. It is possible to analyze the list of neighboring base stations listed below more efficiently and quickly.

First, it is possible to automatically detect neighboring base stations that are missing by the above tools. That is, it finds the neighboring base station which may be disconnected due to the absence of the neighboring base station.

In addition, it is possible to automatically detect unnecessary base stations to be deleted. That is, it finds an unnecessary base station on the neighbor base station list, but does not actually contribute to handoff.

In addition, neighbor base station list priority adjustment automatic detection is possible. That is, the neighboring base station list is in the order of 1 to 20, and the lower the order, the greater the probability that the terminal cannot find the neighboring base station.

4 is a flowchart illustrating a method for managing a neighboring base station list according to an embodiment of the present invention. As shown in FIG. 4, the MSs transmit pilots in the dynamic neighbor base station list of the PSMM in the PSMM under the condition that all terminals distributed in the corresponding BS sector request addition to the BS. When it raises, the statistical data (PNHO statistics) which counted the number of times is calculated | required. In other words, the statistical data obtained by adding the counts together with the peripheral PN offsets requesting the handoff are obtained (S1).

In addition, when the terminal uploads a PN that is not in the neighboring base station list of the system among the PSMMs in which all the terminals distributed in the corresponding base station request to add to the base station, statistical data (Not counted) Ngbr) Get statistics_. That is, since the terminal has raised a peripheral PN offset not included in the dynamic neighbor base station list on the system, handoff is rejected (actual handoff is not possible) (S2).

The statistics of steps S1 and S2 are summed for each PN added by the UE to sort the data (meaning the number of objective handoff attempts) (S3).

On the other hand, a list of neighboring base stations currently input to the system is prepared (S4).

As described above, detection of the neighboring base station missing, the neighboring base station to be deleted, the priority of the neighboring base station list, etc., which are missing in the state where each data is provided as follows using the data provided in the steps S3 and S4 is performed.

First, it is determined whether the number of PNHO attempts and the number of Not Ngbr statistics attempts are present in the neighboring base station list locally (S5).

At this time, if the corresponding PN exists in both statistics (P1 & P2) within the result of the determination of step S5, PNHO statistics attempts by PN and Not Ngbr statistics attempts by PN, for the current system neighbor base station list PN Judging by the "upper priority" (S6)

For additional additions, it can be dangerous to make further decisions based on ranking alone, so when the sum of PNHO statistics attempts and Not Ngbr statistics attempts is sorted by number of attempts, the top five and ten average attempts Print the ratios together. That is, the ratio of the number of attempts to each of the sixth to the 20th PNs of the PNHO statistics attempts and the NNbr statistics for each PN of the PNHO statistics attempts is outputted (S7).

.

Subsequently, the difference between the PN rank, the PNHO statistical attempts, and the Not Ngbr statistical attempts for each PN of the current system neighbor base station list is calculated and output next to the neighbor base station list (S8). Then, it is determined whether or not the PN is present simultaneously in the PNHO statistics attempts per PN and the Not Ngbr statistics attempts per PN for one PN and in the system neighbor base station list (S9). As a result of the determination of step S9, when both PNHO statistics attempts by PN and Not Ngbr statistics attempts by PN and PNs exist in the system neighbor base station list, the PNs in the system neighbor base station list are PNHO statistics per PN + non-adjacent. Subsequently, it is determined whether the base station list (Not Ngbr) is within the 20th number of statistical attempts (S10). As a result of the determination in step S10, if the PN in the system neighboring base station list is within the 20th number of PNHO statistics per PN + Not Ngbr statistics attempts, the current state is maintained (S11), otherwise Outputs "deletion to consider" to the PN (S12).

On the other hand, if the determination result of step S9 is that the PN exists only in the system neighbor base station list (S13), it outputs a "delete review" for the PN in the neighbor base station list (S14), otherwise the PN is Since it exists only within the number of PNHO statistics attempts per PN + Not Ngbr statistics attempts (S15), it is then determined whether it is ranked within the 20th of the number of PNHO statistics attempts by PN (S16). As a result of the determination in step S16, if it is ranked within the 20th number of PNHO statistics attempts for each PN, "addition" is outputted (S17), otherwise, the flow advances to step S11 to maintain the current state.

5 is a view showing the results of the execution of the tool of the present invention. As shown in FIG. 5, when a base station name and a sector are selected in a box, only the corresponding local data is loaded from each of the input data sheets (PNHO, Not Ngbr, System Ngblist) and loaded into the input field. Output

In the additional judgment column, the number of attempts for PNHO statistics and the number of non-neighboring base station list (Not Ngbr) statistics attempts are summed by To PN and output again in descending order by number of attempts. Here, the sum of the PNHO statistics attempts and the Not Ngbr statistics attempts is the number of attempts counted when the PSMM occurs for handoff attempts, and the difference is simply the list of dynamic neighboring base stations the system has. Since the two statistics are divided according to whether they are included in the 30th rank, the number of Not Ngbr statistics attempts is also counted as handoff attempts.

In the ranking column of the ranking judgment, the ranking difference between the current neighboring base station list and the ranking sorted in descending order by the sum of the current neighboring base station list and the PNHO statistics + Not Ngbr statistics attempts is shown. Will output Here, the difference of the ㅁ order means that the current neighbor base station list should be adjusted up and down by the corresponding ㅁ number.

In the decision box of the ranking judgment, the “review review” decision occurs when the number of PNHO + Not Ngbr statistics attempts among the local stations included in the current neighboring base station list does not have 1 count. The neighboring base station local is switched to the second designated color. Here, the deletion review means to delete the corresponding PN.

In the decision column of the ranking decision, the "Consideration for deletion" decision has the number of attempts in the PNHO + Not Ngbr statistics among the localities included in the current neighbor base station list, but the PNHO + non-adjacent station list ( Not Ngbr) When sorted by the number of attempts, a decision is made to delete the PN pushed out of the 20th, and the neighboring base station is transferred to the second designated color. Herein, it means to delete the corresponding PN to be deleted.

The additional ruling is that if a PN is in the 20th place in the order of consensus descending order of PNHO statistics attempts and Not Ngbr statistics attempts, but the PN is not present in the list of current system neighbor base stations, the PN is removed. 3 Changes to the specified color. Here, it means that the corresponding PN should be added to the neighbor base station list.

The neighboring base station is changed to the first designated color for the PN in which both the PNHO statistical attempts and the Not Ngbr statistical attempts exist together in the neighboring base station list. This means that the PN is likely to be raised in priority.

On the other hand, if it is determined further by ranking alone, it may be dangerous. When the sum of PNHO statistical attempts and non-neighboring base station statistical attempts is sorted in descending order by attempts, the ratio of the number of attempts to the top 5 and 10 averages is output.

EXAMPLE

Fig. 6 is a diagram showing an example of neighbor base station list optimization for detecting unnecessary neighbor base stations as the first embodiment of the present invention. As shown in Figure 6, when analyzing the neighboring base station list of Cheonanseong BETA PN, the neighboring base station list is ranked third, but the neighboring base station that does not have any count in the number of PNHO + Not Ngbr statistics attempts Cheonan Sunghwan BETA (PN200) is determined to be the neighboring base station to be deleted.

FIG. 7 is a diagram illustrating a result of attempting an opposite direction (Cheonan Sunghwan BETA) analysis in order to confirm whether a neighboring base station is unnecessary in the first embodiment of the present invention. This is an attempt to analyze the opposite direction (Cheonan Hwan-hwan BETA) to determine whether it is more reliable.

As shown in Fig. 7, it can be seen that the Cheonan Sunghwan BETA, which is the opposite direction, is also unnecessary as the adjacent base station. Since the neighboring base stations, that is, Cheonan St. BETA ↔ Cheonan Seonghwan BETA, do not need to be neighboring base stations at all, it can be confirmed that the PNs should be deleted from each other in the neighboring base station list in both directions. In this way, unnecessary neighboring base stations can be easily and quickly identified.

8 is a diagram illustrating an example of neighbor base station list optimization for detecting a missing neighboring station as a second embodiment of the present invention. As shown in FIG. 8, when analyzing the neighboring base station list of Cheonan Province ALPHA (PN48), the ratio of the top five attempts to PNHO + Not Ngbr statistics and the ratio of attempts to 10 was high (40.1%, 64.9%). It is also recommended to add the highly ranked PN404 (Cheonan Baekseok 1GAMMA) to the list of neighboring base stations.

9 is a view showing the results of attempting the opposite direction (Cheonan Baekseok 1GAMMA) analysis to confirm the addition of the adjacent base station in the second embodiment of the present invention. This was a reverse analysis (Cheonan Baekseok 1GAMMA) analysis to confirm the addition of a more secure neighboring base station.

As in FIG. 9, it is also recommended to add Cheonan ALPHA (PN48) to the opposite direction, Cheonan Baek 1GAMMA (PN404). That is, it can be confirmed that Cheonan Province ALPHA ↔ Cheonan Baekseok 1GAMMA should be added to the neighboring base station list. In this way, the adjacent base station to be added can be easily and quickly determined.

The present invention is not limited to the above-described embodiments, and it will be apparent that many modifications are possible by those skilled in the art within the technical spirit of the present invention.

As described above, the method for managing a neighboring base station list according to the present invention and a recording medium storing a program including the same include statistical data reflecting the number of hand off attempts for each PN (PNHO statistics, ratio). The process of searching for neighboring base station to be added, neighboring base station to be deleted, and neighboring base station to adjust priority by comparing and determining Not Neighbor Statistics) and current Neighbor List. By automating with Tools, you can increase the speed and efficiency of handoff. As described above, the call quality can be ultimately improved by immediately detecting the statistical data and calculating an optimal list of neighboring base stations to prepare for a changing wireless environment.

Claims (6)

a. Statistical data that combines all the counts with the neighboring PN offsets requesting handoff and the counts, and statistical data that adds all the counts together with PN offsets that request the handoff but the system rejects the handoff due to the absence of a neighboring base station list. Outputting and sorting the ranks by the number of trials for each PN of the summed output data; b. Outputting the ratio of the number of attempts of the corresponding PNs against the top 5 or 10 average attempts of the neighboring PN offsets requesting the handoff and the counts plus the N5br ; c. A. Step and b. Comparing the step with the neighboring base station list to perform the enhancement of the neighboring base station priority, the deletion of the neighboring base station, and the addition of the neighboring base station, respectively. The adjacent base station list management method comprising a. The method of claim 1, wherein c. Advancement of adjacent base station priorities in phase In the presence of PN, if a PN exists simultaneously in the number of PN handoff statistics attempts and PN handoff statistics attempts per PN, the priority upgrade is performed for the current system neighbor base station list PN. Neighboring base station list management method characterized in that the step to proceed. The method of claim 1, wherein c. Deletion of neighboring base stations in phase Compute the sum of the rankings of the PN rank of the current neighboring base station list, the number of PN handoff statistics attempts per PN, and the number of Not Ngbr handoff statistics attempts per PN, and the PN for the calculation result. PN Handoff Statistics Attempts by PN and Not Ngbr by PN The PNs are present in the Handoff Statistics Attempts, and the PN of the neighboring base station list is the number of PN Handoff Statistics Attempts by PN and non-neighboring base stations. Not Ngbr A method of managing a neighboring base station list when the number of statistical attempts is not within 20th of the sum result, proceeding to the deletion of the PN of the current system neighboring base station list. The method of claim 1, wherein c. Deletion of neighboring base stations in phase If the PN of the current system neighbor base station list does not exist at all in the PN handoff statistics attempts by PN and the Not Ngbr handoff total attempts by PN, the PN in the current system neighbor base stations list PN by the corresponding PN is not included. And performing the deletion of the neighbor base station list. The method of claim 1, wherein c. Add neighboring base stations in phase If a PN whose result is the sum of the number of PN handoff statistics attempts by PN and the NNbr handoff statistics attempts by PN in the 20th position does not exist in the current ranking of the system neighbor base station list PN, And proceeding to the step of adding to the neighboring base station list management method. A computer-readable recording medium having recorded thereon a program for executing the method of managing a neighboring base station list according to any one of claims 1 to 5.

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