KR20150027548A - Root Sequence Index Collision Detecting System And Method Thereof - Google Patents

Abstract

The present invention relates to a system and a method for detecting a root sequence index collision, which allow a worker to rapidly check and handle the root sequence index collision by enabling efficient detection of the root sequence index collision, which has been carried out manually by the worker and consequently caused degradation of service quality due to tardy checking and handling of the collision, thereby minimizing the degradation of network quality and stable operation of a system. The method for detecting a root sequence index collision according to the present invention comprises the steps of: collecting neighbor relation information about multiple cells; checking whether there exist a cell using the same root sequence index as a reference cell among cells in neighbor relation with the reference cell that is one cell among the multiple cells recorded on the neighboring relation information; and extracting the cell detected in the step of checking whether there exist the cell and providing information on the extracted cell to a user.

Description

Root Sequence Index Collision Detection System and Method Thereof "

The present invention relates to a system and method for detecting a root sequence index collision, and more particularly, to a method and system for determining a collision of a root sequence index, which is manually performed by an operator, The present invention relates to a root sequence index collision detection system and method for minimizing degradation of a network quality and enabling stable operation of a system by allowing an operator to quickly identify and cope with it.

A mobile communication system such as LTE (Long Term Evolution) provides handoff (HO) to a user equipment (UE) located in a cell or a base station (eNB) ) To provide continuous service even during the movement.

This handoff HO is performed by complicated communication between the user terminal UE and the base station eNB. For handoff HO, a sequence for connection with a delimiter such as a base station ID, a cell ID, a physical cell ID, Indexes are required to define or define a sequence. Among these indexes, a root sequence index (RSI) is an indispensable index for handoff (HO).

If the serving cell (or the source base station) providing the current service to the user terminal UE in the handoff HO determines that the handoff HO is required according to the measurement report from the user terminal UE, The serving cell (or source base station) conveys a handoff request message with the context of the user terminal to the target cell (or target base station) to which the user terminal UE will move.

The target cell (or target base station) responds to such a request to include a user terminal (UE) dedicated connection signature for contention-free random access for the connection of the target cell (or target base station) To the serving cell (or the source base station), and this information is transmitted to the user terminal UE, and the signature is reserved.

Such a random access procedure is performed by the user terminal (UE) in the target cell (or the target base station) after the handoff (HO) command to obtain a timing advance (TA) value. In particular, the random access procedure is a non-contention scheme in which a signature is reserved to a user terminal (UE) to avoid collisions between user terminals (UEs) upon connection.

Through this, the user terminal UE performs a random access procedure in the target base station (or the target cell) by transmitting the random access preamble using the dedicated signature. The target base station (or target cell) transmits a random access response message to the user terminal UE and the random access response message includes a timing advance (TA) for the user terminal UE and an uplink resource allocation And the handoff (HO) is performed through this.

Here, the LTE random access procedure may be performed by a competitive scheme other than the non-competitive scheme described above. If the user terminal UE arbitrarily selects a preamble in the set of available signatures, the random access preamble is of a contention type and the signature to be used by the user terminal UE is allocated from the target base station (or target cell) through dedicated signaling On receiving, the random access preamble is a non-contention scheme.

Signatures in these handoffs are generated from the root sequence, in which the root sequence index (RSI) is essential in the handoff process, and the root sequence index is used to optimize this connection procedure.

In particular, in order to facilitate connection of each user terminal (UE), the root sequence index is assigned to have a unique value for each cell.

More specifically, the root sequence index (RSI) must be cullin-free, which must not use the same root sequence index (RSI) as the neighboring cell and the root sequence index (RSI) must be unique within the cell coverage.

However, such a root sequence index (RSI) is given so as not to be overlapped among cells in cell design and operation, but in fact, it causes a curl transition, which causes a degradation of the service quality of the communication network.

However, in the related art, when a collision of the root sequence index (RSI) occurs, it is confirmed whether the collision is caused by the root sequence index (RSI) or the allocation of another unique value is wrong, A process of replacing the existing root sequence index (RSI) and assigning a new value is required.

In particular, since the management and problem-solving processes depend on the manual operation of the operator, there is a high possibility that the root sequence index (RSI) assigned to another cell is duplicated and given to the cell in which the collision occurred, .

That is, conventionally, there is a problem that collision detection of the root sequence index (RSI) is difficult and it is difficult to actively cope with and maintain the network quality.

Korean Patent Publication No. 10-201-0003312 (published on January 07, 2010).

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a method and system for effectively detecting collisions of root sequence indexes, which are manually performed by an operator and cause degradation of service quality due to collision detection and response delay, The present invention provides a root sequence index collision detection system and method that minimizes network quality deterioration and enables stable operation of the system.

According to another aspect of the present invention, there is provided a method for detecting a root sequence index collision comprising: acquiring neighbor relationship information for a plurality of cells; Confirming presence or absence of a reference cell which is one of a plurality of cells recorded in the neighbor relation information and a cell using the same root sequence index among cells neighboring to the reference cell; And extracting the cells detected in the step of checking presence or absence of the cells and providing the extracted cell information to the user.

Collecting handoff information of the cell included in the extracted cell information; Extracting the cell having a handoff failure root sequence index as a main cell using the handoff information of the cell included in the extracted cell information; And providing the main cell to the user.

The extraction of the extraction cell or the extraction of the main cell may be performed on cells using the same frequency or the same frequency band.

And the handoff failure determination is performed by extracting the cell having the handoff success rate with the reference cell equal to or less than a first reference value as the main cell.

And the handoff failure determination is performed by extracting the cell having the handoff attempt number with the reference cell equal to or greater than a second reference value as the main cell.

In addition, the root sequence index collision detection system according to the present invention includes a collection processing unit in an EMS for collecting neighbor relationship information on the cell from an MS that manages information on a BS or a cell; The method comprising: detecting a reference cell which is one of a plurality of cells included in the neighbor relation information and the neighboring cell using the same root sequence index among a plurality of neighboring cells registered in the reference cell, And an algorithm processor for providing the extracted cell to the user.

And the MS acquisition processing unit collects handoff information of the neighboring cells included in the extracted cell and transmits the collected handoff information to the algorithm processing unit.

And a user input processor for receiving a reference value set by a user and transmitting the received reference value to the algorithm processor, wherein the algorithm processor compares the reference value with a handoff success rate or a handoff attempt number included in the handoff information, And extracting the main cell from the extraction cell.

Wherein the algorithm processing unit performs the root sequence index collision detection on the neighbor cell using the same frequency or the same frequency band.

And the algorithm processor extracts the neighboring cell having a handoff success rate with the reference cell equal to or less than a first reference value of the reference value as the main cell.

And the algorithm processing unit extracts the neighboring cell having the handoff attempt number with the reference cell equal to or greater than a second reference value of the reference value as the main cell.

The system and method for detecting a root sequence index collision according to the present invention can be efficiently performed by a method and system for determining collision of a root sequence index that is manually performed by an operator and causes degradation of service quality due to collision confirmation and response delay So that it is possible to quickly identify and cope with the work by the operator, thereby minimizing deterioration of the network quality and enabling stable operation of the system.

1 is a flowchart for explaining a root sequence index detection method according to the present invention;
2 is an exemplary diagram for explaining occurrence of a collision of a root sequence index;
3 is an exemplary diagram illustrating the configuration of a system for root sequence index collision detection according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. It should be noted that the drawings denoted by the same reference numerals in the drawings denote the same reference numerals whenever possible, in other drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. And certain features shown in the drawings are intended to be illustrative, not limiting, or reduced, or simplified, and the drawings and elements thereof are not necessarily drawn to scale. However, those skilled in the art will readily understand these details.

FIG. 1 is a flowchart for explaining a root sequence index detection method according to the present invention. 2 is an exemplary diagram for explaining the occurrence of a collision of a root sequence index.

Referring to FIGS. 1 and 2, a method for detecting a root sequence index according to the present invention includes a step (S10) of collecting neighbor relation information, a step S20 of using a root sequence index of a neighboring cell, (S30). The root sequence index sensing method according to the present invention includes a handoff information collection step S40, a handoff information application step S50, and a main cell information providing step S60.

The collecting of the neighbor relation information (S10) is a step of collecting Neighbor Relation Table (NRT) information of each cell to detect collision of the root sequence index (RSI). In step S10 of collecting the neighbor relationship information, the system collects neighbor relation tables of each cell to be operated. Here, the collection range may be limited to cells in an area designated by the user or controlled by the system, but the present invention is not limited thereto. Cells that are registered as neighbors or target cells in the neighbor relation information of a specific cell but not included in the collection area collect neighbor relationship information even if they are not included in the collection area.

The step S20 of detecting the use of the root sequence index of the neighboring cell is a step in which the system recognizes the RSI of the cell in which the neighbor relation information is collected and detects the redundant use of the root sequence index. Referring to FIG. 2, in the case of a root sequence index, when there is a reference cell which is a randomly selected cell, a collision occurs when a cell using the same root sequence index exists among a plurality of neighboring cells for a reference cell . Therefore, the system sequentially selects a plurality of cells in which neighbor relationship information is collected as reference cells, identifies the root sequence index (RSI) of neighboring cells of the selected reference cell, and identifies neighboring cells having the same reference cell as neighboring cells It is confirmed that the root sequence index (RSI) is used. Herein, the reference cell may select any cell among a plurality of cells in the system, but may be selected by the system, or may be selected by the system according to a condition or rule set by the user, But is not limited to. That is, when the reference cell is the cell B in FIG. 2, the cell A and the cell C become neighbor cells to the reference cell B. At this time, when the cell A and the cell C use the same root sequence index (RSI) as shown in FIG. 2, a collision occurs in the handoff process. Therefore, it is confirmed whether the neighboring cell uses the root sequence index (RSI) with respect to the random reference cell. If a cell using the same root sequence index (RSI) is detected, the cell is classified as the extracted cell.

In particular, in step S20 in which the use of the root sequence index of the neighboring cell is detected, a cell to be collision-detected may be limited to a cell using the same frequency or a cell using the same frequency band. 2. Description of the Related Art In a mobile communication system such as LTE, a frequency band of a plurality of frequencies or a constant bandwidth is often used for providing a service. In this case, if another frequency or frequency band is used, collision does not occur even if the root sequence index (RSI) is used in the same manner, and if a collision occurs, the communication between the target base station or the target cell and the user terminal The cell using the other frequency or frequency band is excluded from the detection target.

The extracted cell information providing step S30 is a step in which the system collects cell information that is detected to use the same root sequence index (RSI) in the root sequence index use sensing step S20 of the neighboring cell and provides the collected cell information to the user. In this step, the system provides the extracted cells through an output device or by means designated by the user so that the user can confirm and process the extracted cells. In the extracted cell information providing step S30, cells using the same root sequence index (RSI) are provided without prioritization. Cells having a high processing priority are selected through the following process, To the user.

The cells that are urgently required to be processed among the cells included in the extracted cell are classified through the following process and are provided to the user together with the extracted cell information or separately. To this end, the root sequence index collision detection method of the present invention includes a handoff information collection step (S40), a handoff information application step (S50), and a main cell information provision step (S60).

The handoff information collection step S40 is a step in which the system collects handoff-related information for an area or cells requiring collision detection of the root sequence index (RSI). More specifically, the information collected in the handoff information collection step (S40) may be a step of collecting handoff information on the cell extracted as the extracted cell in the above-described step. In other words, it is also possible to collect the handoff information for a wide range of cells and to extract and use only information about necessary cells from the collected information, and it is also possible to collect handoff information for the extracted cells and use them , It is not intended to limit the invention to the precise form disclosed. In addition, the handoff information collection step (S40) collects handoff-related information such as a cell pair in which a handoff occurs and a target cell, a number of handoff attempts, and a handoff success rate, by the system.

The handoff information application step S50 is a step of applying the collected handoff information to the extracted cells and selecting cells requiring quick action for collision due to use of the same root sequence index (RSI). More specifically, the handoff information application step S50 is a step of extracting cells that may be a major factor in network quality degradation when a collision occurs due to a frequent occurrence of handoff among extracted cells and a root sequence index (RSI) . For this, the handoff information application step (S50) selects the main cells among the extracted cells by using the degree of handoff occurrence and the success rate when performing the handoff. To this end, the handoff information application step (S50) selects the main cell by applying the reference value input from the user to the handoff information collected for the extracted cell. The reference value includes a first reference value for the success rate and a second reference value for the number of trials. That is, an extraction cell having a handoff success rate equal to or less than a first reference value, that is, a certain success rate, can be selected as a main cell. Since this handoff success rate is directly related to the network quality, it is possible to classify the cells that need urgent processing. Particularly, it is possible to further reduce the range by selecting a cell having a very large influence on network quality among the cells to which the first reference value is applied, that is, a cell in which handoff occurs frequently compared to other cells. For example, handoffs frequently occur in urban areas where there are more mobile populations than in cells in rural areas. Failure of handoffs in urban areas is an important reason for lowering network quality reliability by users. Therefore, if a cell having a high handoff success rate by the user terminal is selected as a cell having a high number of attempted handoff attempts, it is possible to extract cells with frequent handoff failures in a region where there are many subscribers, . The first and second reference values may be applied to only one extraction cell or may be applied together, and the present invention is not limited by the presented examples.

The main cell information providing step S60 is a step of providing the main cell selected in the handoff information applying step S50 to the user in a manner similar to the method of providing the extracted cell information. In the main cell information providing step S60, a cell classified as a main cell is provided to the user according to the frequency or success rate of the handoff among the extracted cells, so that the quick action of the user can be performed. The main cell information may be provided separately from the extraction cell information providing step (S30) or simultaneously with the extraction cell information providing step (S30). In particular, the present invention can be applied by providing a separate display method so that the user can easily distinguish the main cell when provided with the extracted cell information, but the present invention is not limited thereto.

3 is an exemplary diagram illustrating a configuration of a system for root sequence index collision detection according to the present invention.

Referring to FIG. 3, a system for detecting root sequence index collision according to the present invention includes an EMS collection processing unit 20, a user input processing unit 30, a database 40, and an algorithm processing unit 50. And an element management system 10 for providing the EMS and the cell information to the EMS collection processing unit 20 at the request of the EMS collection processing unit 20.

An element management system (hereinafter, referred to as 'EMS') 10 is configured to manage a mobile communication network, in particular, a base station (eNB) of an LTE network. The EMS 10 includes a server and collects failure alarms, statistics, and configuration information of the base station, and performs an inquiry and control of the status of the equipment by the operator. In particular, the EMS 10 collects and provides the information requested by the EMS collection processing unit 20, collects the neighbor relationship information and the handoff statistical information, and transmits the collected information to the EMS collection processing unit 20. In addition, the EMS 10 identifies the cell and the base station as well as the cell information, the cell ID, the physical cell ID, the location information, the root sequence index information, Information for collision confirmation of the sequence index is collected and transmitted to the EMS collection processing unit 20. [

The EMS collection processing unit 20 receives equipment information and neighbor relationship information, in particular, handoff statistical information and neighbor relationship information, from the EMS 10 via the EMS 10 and transmits the same to the algorithm processing unit 50 and the database 40 do. In addition, the neighbor relationship information received from the EMS 10 by the EMS collection processing unit 20 includes a neighbor relationship table (NRT).

The user input processing unit 30 receives the first and second reference values for cell extraction and the user command for selecting the extracted cell, and transmits the user command to the algorithm processing unit 50. That is, the user input processing unit 30 may receive a user input from the user, such as a start command and a range for progressing cell extraction, to the user input processing unit 30, but the present invention is not limited thereto. The user input processing unit 30 may be configured to include a browser interface 31 for easily inputting a user and effectively providing a processing result, but the present invention is not limited thereto.

The database 40 stores and manages the information transmitted by the EMS collection processing unit 20 and the user input processing unit 30 and the information processed by the algorithm processing unit 50 and includes an algorithm processing unit 50, 30 to provide the stored information.

The algorithm processing unit 50 performs a process for determining occurrence of a collision of the root sequence index using the neighbor relation information provided from the EMS collection processing unit 20, And provides the extracted cell information to the user. The algorithm processing unit 50 extracts the main cell by applying the handoff information provided from the EMS collection processing unit 20 to the extracted cell together with the reference value transmitted from the user input processing unit 30. [ Specifically, as described above, the handoff success rate is compared with a first reference value of the reference value, and the number of handoff attempts is compared with a second reference value of the reference value to determine whether a handoff occurs frequently or a cell or handoff A cell having a high failure rate due to collision is classified as a main cell and provided to a user. In particular, when extracting and classifying the extracted cell and the main cell, the algorithm processing unit 50 checks the collision of the cell using the same frequency or frequency band, so that the actual collision and the deteriorated network quality are expected And provide them. Accordingly, the algorithm processing unit 50 has a great importance in determining the quality of service among the cells in which the collision occurs, and distinguishes the cells to be urgently processed and the cells to be processed even after the collision. Accordingly, the user can preferentially process the urgent cell collision processing, and the problematic cell having a relatively low priority can be processed later to minimize the deterioration of the network quality, thereby minimizing the occurrence of problems and improving the quality.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, . ≪ / RTI > Accordingly, such modifications are deemed to be within the scope of the present invention, and the scope of the present invention should be determined by the following claims.

10: EMS
20: EMS collection processing unit
30: User input processor
40: DB
50:

Claims (11)

Collecting neighbor relationship information for a plurality of cells;
Confirming presence or absence of a reference cell which is one of a plurality of cells recorded in the neighbor relationship information and a cell using a same root sequence index among cells neighboring to the reference cell; And
And extracting the cell detected in the step of checking presence or absence of the cell and providing extracted cell information to a user. The method according to claim 1,
Collecting handoff information of the cell included in the extracted cell information;
Extracting the cell having a handoff failure root sequence index as a main cell using the handoff information of the cell included in the extracted cell information; And
And providing the primary cell to the user. ≪ Desc / Clms Page number 20 > 3. The method of claim 2,
The step of extracting the extracted cell or extracting the main cell
Is performed for cells using the same frequency or the same frequency band. 3. The method of claim 2,
The handoff failure judgment
And extracting the cell having the handoff success rate with the reference cell equal to or less than a first reference value as the main cell. 5. The method of claim 4,
The handoff failure judgment
And extracting the cell having the handoff attempt number with the reference cell equal to or greater than a second reference value to the primary cell. A collection processing unit for collecting neighbor relationship information on the cell from an MS that manages information on a base station or a cell;
The method comprising: detecting a reference cell which is one of a plurality of cells included in the neighbor relation information and the neighboring cell using the same root sequence index among a plurality of neighboring cells registered in the reference cell, And an algorithm processor for providing the extracted cells to the user. The method according to claim 6,
The MS acquisition processing unit
And collects handoff information of the neighboring cell included in the extracted cell and transmits the handoff information to the algorithm processing unit. 8. The method of claim 7,
And a user input processing unit for receiving a reference value set by the user and transmitting the received reference value to the algorithm processing unit,
The algorithm processing unit
And comparing the handoff success rate or the number of handoff attempts included in the handoff information with the reference value to extract a main cell from the extracted cell. The method according to claim 6,
The algorithm processing unit
And performs the root sequence index collision detection for the neighbor cell using the same frequency or the same frequency band. 9. The method of claim 8,
The algorithm processing unit
And extracts, as the main cell, the neighboring cell having a handoff success rate with the reference cell equal to or less than a first reference value of the reference value. 11. The method of claim 10,
The algorithm processing unit
And extracts, as the main cell, the neighboring cell whose handoff attempt number with the reference cell is equal to or greater than a second reference value of the reference value.

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