KR101966911B1 - Base station management apparatus and control method thereof - Google Patents

Abstract

The present invention relates to a communication service quality and a base station radio resource capacity to be provided to a terminal by adaptively changing the frequency band used between adjacent base stations adaptively in the situation where base stations using different frequency bands coexist, A base station control apparatus and an operation method of a base station control apparatus capable of efficiently operating a base station.

Description

TECHNICAL FIELD [0001] The present invention relates to a base station control apparatus and a base station control apparatus,

The present invention relates to a base station control apparatus and a method of operating a base station control apparatus, and more particularly, to a base station control apparatus and a base station control apparatus in which, in a situation where base stations using different frequency bands coexist, And more particularly, to a base station control apparatus and a base station control apparatus capable of efficiently operating a base station considering both the quality of a communication service provided to the terminal and the radio resource capacity aspect of the base station.

Recently, base stations having different cell sizes are arranged in the same area, and a communication system is applied. In such a communication system environment, various types of small base stations having a smaller coverage other than a general macro base station are arranged, so that various types of base stations form coverage in an overlapped area and provide a wireless communication service to the terminal.

In recent years, a multi-carrier system that provides communication services using a plurality of different frequency bands has appeared.

According to such a multi-carrier system, a terminal can select one frequency band among a plurality of different frequency bands and receive a communication service through the same. In such a multicarrier system environment, the terminals are distributed in a plurality of different frequency bands and the communication service is used, thereby increasing the capacity of radio resources to be operated by the base station.

Currently, multi-carrier communication system environments in which base stations providing communication services using different frequency bands having different cell sizes are disposed in the same area are being applied.

However, in such a multi-carrier communication system environment, there is a case where cells of a plurality of small base stations are present in a cell of a macro base station. In this case, interference between cells of a macro base station and a small base station increases, The number of handover times to move between cells increases and the probability of a handover failure increases. As a result, the quality of the communication service provided to the terminal deteriorates.

Accordingly, various frequency resource allocation algorithms have been proposed to reduce inter-cell interference between macro base station cells and small base stations, and various handover algorithms have been proposed to reduce the probability of handover failure.

However, the proposed algorithms for solving such existing problems are complicated to apply to the actual communication system environment, and have limitations in adaptively coping with the number of users who vary with time, for example, user poverty phenomenon or user crowding phenomenon.

Therefore, in the present invention, it is easy to apply to a multicarrier communication system environment based on the environmental singularity of the multicarrier communication system and the load (for example, the number of users) of the base station varying occasionally, We propose a scheme that can operate the base station efficiently.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a mobile station in which, in a situation where base stations using different frequency bands coexist, A base station control apparatus and a base station control apparatus capable of efficiently operating a base station considering both the quality of a communication service provided to the terminal and the base station radio resource capacity.

According to a first aspect of the present invention, there is provided a base station control apparatus comprising: a base station grouping unit for grouping a plurality of adjacent base stations; A load information checking unit for checking load information on the plurality of grouped base stations; And operating the grouped plurality of base stations in a single frequency mode using the same single frequency band, or in accordance with the total load on the plurality of grouped base stations confirmed based on the load information, And a base station control unit for operating at least two base stations in a multi-frequency mode using different frequency bands.

Preferably, the base station control unit operates the grouped plurality of base stations in the single frequency mode if the total load on the plurality of grouped base stations is less than the pre-designated first threshold load, At least two of the plurality of grouped base stations can operate in the multi-frequency mode.

Advantageously, said at least two base stations may be base stations having overlapping cell coverage.

Preferably, the base station grouping unit groups the base stations based on the cell coverage of each of the plurality of base stations, and the cell coverage of each of the plurality of grouped base stations is determined based on a cell coverage of a specific base station Cell coverage, and may overlap with the cell coverage of at least one of the plurality of grouped base stations.

Preferably, the BS controller changes a grouping of the plurality of BSs to the single-frequency mode or the multi-frequency mode, after switching the UEs located in the cell coverage of the grouped BSs to the cell coverage of the particular BS. .

According to a second aspect of the present invention, there is provided a method of operating a base station control apparatus including: grouping a plurality of adjacent base stations; A load information checking step of checking load information on the plurality of grouped base stations; And operating the grouped plurality of base stations in a single frequency mode using the same single frequency band, or in accordance with the total load on the plurality of grouped base stations confirmed based on the load information, And a base station control step of operating at least two base stations in a multi-frequency mode using different frequency bands.

Preferably, the base station control step operates the grouped plurality of base stations in the single frequency mode if the overall load on the plurality of grouped base stations is less than the predetermined first threshold load, At least two of the plurality of grouped base stations can be operated in the multi-frequency mode if the total load on the grouped base stations is equal to or greater than the predetermined second critical load.

Advantageously, said at least two base stations may be base stations having overlapping cell coverage.

Preferably, the base station grouping step is performed based on cell coverage of each of the plurality of base stations, and the cell coverage of each of the plurality of grouped base stations is grouped into a specific base station And may overlap with the cell coverage of at least one other base station among the plurality of grouped base stations.

Preferably, the BS controller changes a grouping of the plurality of BSs to the single-frequency mode or the multi-frequency mode, after switching the UEs located in the cell coverage of the grouped BSs to the cell coverage of the particular BS. .

Preferably, the method further comprises the step of analyzing and statistically processing load information collected for a specific period with respect to the plurality of grouped base stations; Wherein the step of controlling the base station comprises the steps of operating the plurality of grouped base stations in the single frequency mode according to a total load on the plurality of grouped base stations and based on the statistical processed load information, .

According to the method of operating the base station control device and the base station control device according to the present invention, the frequency bands used between adjacent base stations are adaptively changed equally or differently in a situation where base stations using different frequency bands coexist, It is possible to efficiently operate the base station considering both the quality of the communication service and the capacity of the base station radio resource.

1 is a configuration diagram illustrating a communication system including a base station control apparatus according to a preferred embodiment of the present invention.
2 is a block diagram showing a configuration of a base station control apparatus according to a preferred embodiment of the present invention.
3 is a flowchart illustrating an operational flow of a communication system including a base station control apparatus according to a preferred embodiment of the present invention.
4 is a control flowchart illustrating an operation method of a base station control apparatus according to a preferred embodiment of the present invention.
5 is an exemplary diagram illustrating an example in which a plurality of base stations are grouped in the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a diagram illustrating a communication system including a base station control apparatus according to a preferred embodiment of the present invention.

As shown in FIG. 1, a communication system including a base station control apparatus according to the present invention includes a plurality of base stations 10 and a base station control apparatus 100 that provide a communication service to a terminal connected thereto.

The plurality of base stations 10 may include a small base station for building small cells such as femtocells and picocells, and a macro base station for building macro cells. Each base station included in the plurality of base stations 10 can provide a communication service to a terminal connected to the base station 10 by using one frequency band among a plurality of different frequency bands.

That is, the plurality of base stations 10 are preferably base stations of a multi-carrier system that provides communication services using a plurality of different frequency bands.

Hereinafter, for convenience of description, the base stations 1, 2, 3, 4, and 5 among the plurality of base stations 10 will be described with reference to FIG.

The plurality of base stations 10, that is, the base stations 1, 2, 3, 4, and 5, may be set as the fundamental frequency bands used by one of the plurality of different frequency bands.

For example, the base station 1 may have a first frequency band, the base station 2 may have a first frequency band, the base station 3 may have a second frequency band, the base station 4 may have a second frequency band, and the base station 5 may have a third frequency band Alternatively, the base stations 1, 2, 3 and 4 may have the same first frequency band as the basic frequency band, and the third frequency band may be set to the base station 5.

The base station control apparatus 100 according to the present invention groups a plurality of adjacent base stations.

That is, the base station control apparatus 100 can group a plurality of base stations adjacent to each other among the plurality of base stations 10 described above.

At this time, the base station control apparatus 100 can group a plurality of base stations based on the cell coverage of each base station.

The cell coverage of each of a plurality of base stations grouped into one group is included in a cell coverage of a specific base station that is not included in the grouped base stations and the cell coverage of at least one base station among the grouped base stations It is preferable to overlap with.

For example, referring to FIG. 5, the base station control apparatus 100 can group adjacent base stations 1, 2, and 4 into one group 1. 5, the base stations 1, 2, and 4 of the group 1 are included in the cell coverage (C5) of the specific base station that is not included in the group 1, that is, the base station 5, The cell coverage of the base station 2 is overlapped with the cell coverage of the base stations 1 and 4, and the cell coverage of the base station 4 is overlapped with the cell coverage of the base station 2.

Then, the base station control apparatus 100 confirms the load information for a plurality of grouped base stations for each group grouped as described above. Hereinafter, for convenience of explanation, the above-mentioned group 1 among the groups will be described.

That is, the base station control apparatus 100 confirms the load information on the plurality of grouped base stations, that is, the base stations 1, 2, and 4, with respect to the group 1 described above.

Accordingly, the base station control apparatus 100 determines, based on the load information of the base stations 1, 2, and 4 confirmed as described above, May operate in a single frequency mode using the same single frequency band, or at least two of the grouped base stations 1, 2 and 4 may operate in a multi-frequency mode using different frequency bands.

More specifically, when the overall load on the grouped base stations 1, 2, and 4 is less than the first predetermined threshold load, the base station control apparatus 100 transmits the grouped base stations 1, 2, and 4 to the same single frequency band (C1, C2, C4) of each of the base stations 1, 2, 4 has a single single frequency band (e.g., a first frequency band) Cell, thereby improving the quality of the communication service by deriving the effect of reducing interference and handover failure probability between the cells (C1, C2, C4) of the base stations 1, 2, and 4, respectively.

If the total load on the grouped base stations 1, 2, and 4 is equal to or greater than the second predetermined threshold load, the base station control apparatus 100 transmits at least two of the grouped base stations 1, 2, (A first frequency band and a second frequency band), and the cell coverage (C1, C2, C4) of each of the base stations 1, 2, and 4 is different from the cell coverage of other base stations Band, so that the effect of increasing the capacity of the radio resources to be operated by each of the base stations 1, 2, and 4 can be derived.

Here, it is preferable that the above-mentioned second critical load is equal to or greater than the above-mentioned first critical load.

If the second threshold load is larger than the first threshold load, then the base station controller 100 determines that the total load on the grouped base stations 1, 2, 4 is not less than the first threshold load and not more than the second threshold load , And the grouped base stations 1, 2, and 4 may be maintained in the basic operation mode using the predetermined base frequency band for the base stations 1, 2, and 4, respectively.

On the other hand, when the second threshold load is equal to the first threshold load, the base station controller 100 determines that the total load on the grouped base stations 1, 2, and 4 is less than or equal to the first threshold load (= , The grouped base stations 1, 2 and 4 are operated in the above-mentioned single frequency mode, and the total load on the grouped base stations 1, 2 and 4 exceeds the second threshold load (= first threshold load) The grouped base stations 1, 2, and 4 can operate in the multi-frequency mode described above.

Hereinafter, a configuration of a base station control apparatus according to a preferred embodiment of the present invention will be described in more detail with reference to FIG.

The base station control apparatus 100 according to the present invention includes a base station grouping unit 110 for grouping a plurality of adjacent base stations, a load information checking unit 120 for checking load information for the grouped plurality of base stations, Depending on the total load on the plurality of grouped base stations identified based on the load information, it is possible to operate the grouped plurality of base stations in a single frequency mode using the same single frequency band, or to operate at least two of the grouped base stations And a base station control unit 130 for operating the above-mentioned base stations in a multi-frequency mode using different frequency bands.

The base station grouping unit 110 groups a plurality of adjacent base stations.

That is, the base station grouping unit 110 can group a plurality of base stations adjacent to each other among the plurality of base stations 10 described above.

At this time, the base station grouping unit 110 may group a plurality of base stations based on the cell coverage of each base station.

The cell coverage of each of a plurality of base stations grouped into one group by the base station grouping unit 110 is included in a cell coverage of a specific base station not included in a plurality of grouped base stations, It is preferable to overlap with the cell coverage of at least one base station.

More specifically, the base station grouping unit 110 can identify the base stations included in the cell coverage of the same specific base station based on the cell coverage of each of the plurality of base stations 10.

For example, referring to FIG. 5, the base station grouping unit 110 can identify the base stations 1, 2, 3, and 4 included in the cell coverage C5 of one specific base station, that is, the base station 5.

The base station grouping unit 110 confirms the overlapping relationship between the cell coverage of the base stations included in the cell coverage of the specific base station and identifies the base station overlapped with the cell coverage of at least one base station.

For example, referring to FIG. 5, when the base station grouping unit 110 confirms the overlapping relationship between the cell coverage of the base stations 1, 2, 3, and 4 included in the cell coverage C5 of the base station 5, It can be seen that the cell coverage (C1, C2, C4) of 1, 2, and 4 overlap with at least one cell coverage.

Accordingly, the base station grouping unit 110 divides the base stations 1, 2, and 4 in which the cell coverage is overlapped among the base stations 1, 2, 3, and 4 included in the cell coverage C5 of one specific base station, Group 1 can be grouped into one group. 5, the base stations 1, 2, and 4 of the group 1 grouped by the base station grouping unit 110 are included in the cell coverage C5 of the specific base station that is not included in the group 1, that is, the base station 5 The cell coverage of the base station 1 is overlapped with the cell coverage of the base station 2, the cell coverage of the base station 2 is overlapped with the cell coverage of the base stations 1 and 4, and the cell coverage of the base station 4 is overlapped with the cell coverage of the base station 2.

The load information verifying unit 120 checks the load information of the plurality of grouped base stations for each group grouped by the base station grouping unit 110 as described above. Hereinafter, for convenience of explanation, the group 1 described above will be described.

That is, the load information verifying unit 120 confirms the load information for the plurality of grouped base stations, that is, the base stations 1, 2, and 4, with respect to the group 1 described above.

Here, the load information confirmed by the load information checking unit 120 may be load information obtained by analyzing the load information collected during a specific period to the base stations 1, 2, and 4 and statistically processed.

More specifically, according to the first embodiment, the load information confirmed by the load information checking unit 120 is a predetermined time unit (for example, 5 seconds) during a specific collection period (for example, 4 weeks to the present) The load information confirmed by the load information checking unit 120 according to the second embodiment may be, for example, a predetermined period of time (for example, For example: 10 minutes) Load information collected by analyzing the load information collected in the specified time unit (for example, 5 seconds) immediately before the previous time, and may be statistical processed load information, that is, load information immediately before.

At this time, the load of the base station may mean at least one of the number of terminals located in the cell coverage of the base station, the number of terminals using the communication service connected to the base station, the traffic volume processed by the base station, and the resource utilization rate (PRB) have. Therefore, the load information collected as described above may include information on the load described above.

Hereinafter, an embodiment will be described in which the load information on the grouped base stations 1, 2 and 4, in particular the load information obtained by statistical processing, is checked.

The load information checking unit 120 can collect load information from each of the plurality of base stations 10 at a predetermined time unit (e.g., 5 seconds).

Accordingly, in accordance with the first embodiment described above, the load information verifying unit 120 obtains the load information from each of the grouped base stations 1, 2 and 4 during a specific period, for example, a predetermined collection period (for example, (For example, 5 seconds), and the load information obtained by statistically processing the respective base stations 1, 2, and 4 for each time zone, for example, one day (24 hours) Load, maximum load, average load, etc.).

That is, the load information checking unit 120 checks the load pattern indicating how the load of each of the base stations 1, 2, and 4 varies according to the time zone.

Of course, as described above, the load information is continuously collected from each of the plurality of base stations 10 at a predetermined time unit (for example, 5 seconds), and based on this, (Not shown) for statistically processing information such as a minimum load, a maximum load, and an average load for each time slot, and the load information checking unit 120 of the base station control device 100 according to the present invention calculates a load It is also possible to check the load information statistically processed, that is, the load pattern information (e.g., minimum load, maximum load, average load, etc.) for each base station through interlocking with the device (not shown).

The load information verifying unit 120 compares the load information statistically processed with respect to the grouped base stations 1, 2, and 4, that is, the load pattern information (e.g., minimum load, maximum load, average load, (For example, 15 o'clock) from the load pattern information (for example, minimum load, maximum load, average load, etc.) statistically processed for each time zone for the grouped base stations 1, (For example, minimum load, maximum load, average load, and the like) corresponding to the load pattern information.

Accordingly, according to the first embodiment, the base station control unit 130 determines the load information confirmed for the base stations 1, 2 and 4 grouped by the load information checking unit 120, that is, the load corresponding to the current time zone It is desirable to identify the pattern information (e.g., minimum load, maximum load, average load, etc.) as the total load for the grouped base stations 1,

On the other hand, according to the above-described second embodiment, the load information confirmation unit 120 obtains the load information from each of the grouped base stations 1, 2 and 4 during a specific period, for example, a predetermined time unit (for example, (Eg, minimum load, maximum load, average load, etc.) by analyzing the load information collected by the base station (eg, 5 seconds) have.

That is, the load information verifying unit 120 confirms the load state immediately before the base stations 1, 2, and 4, for example, ten minutes before.

Therefore, the load information confirmation unit 120 can check the load information statistically processed for the grouped base stations 1, 2, and 4, that is, the previous load information (e.g., minimum load, maximum load, average load, and the like).

Accordingly, according to the second embodiment, the base station control unit 130 determines the load information confirmed for the base stations 1, 2 and 4 grouped by the load information checking unit 120, that is, the previous load information (e.g., , Average load, etc.) as the total load on the grouped base stations 1, 2, and 4.

The base station control unit 130 controls the grouped base stations 1, 2 and 4 to have the same single frequency (or frequency) based on the total load on the grouped base stations 1, 2, and 4 that are confirmed based on the load information confirmed by the load information checking unit 120 Band mode, or operates at least two of the grouped base stations 1, 2 and 4 in a multi-frequency mode using different frequency bands.

In other words, the base station control unit 130 stores the load information confirmed by the load information checking unit 120, that is, the load pattern information corresponding to the current time zone (e.g., 15 o'clock) according to the first embodiment Depending on the total load on the base stations 1, 2, and 4 that are confirmed on the basis of the load information (for example, the minimum load, the maximum load, the average load, etc.) , 2,4 in a single frequency mode or in a multiple frequency mode.

At this time, the base station control unit 130 calculates the total minimum load, the total maximum load by summing the maximum loads, the total maximum load by summing the minimum loads based on the respective load pattern information for the current time zone (e.g., 15 hours) The total average load of each of the base stations 1, 2 and 4 can be confirmed as the total load of the plurality of base stations 1, 2 and 4, that is, the total load of the group 1, It is possible to confirm the total load of the plurality of base stations 1, 2 and 4 as the total load of the group 1, that is, the total minimum load, the total maximum load combined with the minimum loads, and the total average load,

More specifically, when the total load on the grouped base stations 1, 2, and 4 is less than the first predetermined threshold load, the base station control unit 130 divides the grouped base stations 1, 2, and 4 into the same single frequency band And operates at least two of the grouped base stations 1, 2 and 4 in a multi-frequency mode using a different frequency band.

At this time, the first threshold load is a predetermined threshold value for determining whether it is desirable to improve the quality of the communication service provided to the terminal even if the radio resource capacity of the base station in the group becomes small, and the second threshold load Even if the quality of the communication service provided to the terminal decreases, it is a predetermined threshold value to determine whether it is desirable to improve the radio resource capacity of the base station.

This second critical load is preferably greater than or equal to the first critical load.

If the second threshold load is designated to be larger than the first threshold load, the base station control unit 130 determines that the total load on the grouped base stations 1, 2, and 4 is less than the first threshold load, , 4 are operated in a single frequency mode using the same single frequency band (e.g. the first frequency band) so that the cell coverage (C1, C2, C4) of each of the base stations 1, (C1, C2, C4) of each of the base stations 1, 2, and 4, thereby reducing the probability of interference and handover failures of the base stations 1, 2, Can be improved.

If the total load on the grouped base stations 1, 2 and 4 is equal to or greater than the second threshold load, the base station control unit 130 transmits at least two of the grouped base stations 1, 2 and 4 to different frequency bands (for example, Frequency band and the second frequency band), so that the cell coverage (C1, C2, C4) of each of the base stations 1, 2, and 4 has a frequency band different from that of other base stations The effect of increasing the capacity of the radio resources to be operated by each of the base stations 1, 2, and 4 can be derived.

At this time, at least two or more base stations that use the above-described different frequency bands among the grouped base stations 1, 2, and 4 will be base stations having overlapping cell coverage.

That is, if the total load on the grouped base stations 1, 2, and 4 is equal to or greater than the second threshold load, the base station control unit 130 may transmit at least two or more base stations to use different frequency bands of the grouped base stations 1, Can be confirmed.

At this time, the base station control unit 130 confirms the cell coverage overlapping among the grouped base stations 1, 2 and 4 to the base station to use a different frequency band.

For example, referring to FIG. 5, among the grouped base stations 1, 2 and 4, the cell coverage is overlapped with the base station 1 and the base station 2, and the cell coverage is overlapped with the base station 2 and the base station 4. However, Are not overlapped with each other.

Accordingly, the base station control unit 130 uses a different frequency band between at least two base stations, i.e., the base stations 1 and 2 overlapping among the grouped base stations 1, 2 and 4, The base station 1 and the base station 4 may use the first frequency band and the base station 2 may use the second frequency band to operate in the multiple frequency mode.

If the total load on the grouped base stations 1, 2, and 4 is not less than or equal to the first threshold load and not equal to or greater than the second threshold load, the base station control unit 130 transmits the grouped base stations 1, , 4 may be maintained in a basic operation mode using a predetermined basic frequency band

In a case where the second critical load is equal to the first critical load, the base station control unit 130 determines that the total load on the grouped base stations 1, 2, and 4 is equal to or less than the first critical load (Or less), operate the grouped base stations 1, 2 and 4 in the single frequency mode described above, and if the total load for the grouped base stations 1, 2, 4 exceeds the second critical load (= first threshold load) Or more), the grouped base stations 1, 2, and 4 can operate in the multi-frequency mode described above.

In addition, when the base stations 1, 2 and 4 grouped as described above are operated in the single frequency mode or the multi-frequency mode, the base station control apparatus 100 controls the base stations 1, 2, So that it is possible to provide seamless communication service.

The base station control unit 130 transmits the cell coverage C1, C2, C4 of the group 1, 2, 4 to the cell coverage C1, C2 of the group 1, 2, , C4 to the cell coverage C5 of the base station 5, and then operate the grouped base stations 1, 2 and 4 in the single frequency mode or the multiple frequency mode as described above.

That is, when it is determined that the total load on the grouped base stations 1, 2, and 4 is less than or equal to the first threshold load, the base station controller 130 determines the cell coverage of the group 1, C1, C2, and C4 are transited to the base station 5, and after the number of terminals of the grouped base stations 1, 2, and 4 is decreased to 0, the grouped base stations 1, 2, Frequency mode.

Therefore, the base station control apparatus 100 according to the present invention can prevent the communication service disconnection that occurs in the process of switching the operation modes of the grouped base stations 1, 2 and 4 to the terminal.

At this time, the UE transition process of transitioning the UEs located in the cell coverage (C1, C2, C4) of the grouped Node Bs 1, 2 and 4 to the Node B 5 is performed in the idle mode load balancing The transition between the base stations can be made according to the policy, and transitions can be made between the base stations according to the existing active mode load balancing policy for the terminals in the active state using the communication service. I will.

After switching the operation modes of the grouped base stations 1, 2, and 4 as described above, it is preferable to distribute the load (load) according to the existing load balancing policy for the plurality of base stations 10.

Each of the base stations 10 included in the plurality of base stations 10 may be a base station having a DU (Digital Unit) and a RU (Remote Unit) May be centrally configured in the central unit. In this case, the base station controller 100 of the present invention, that is, the base station controller 130 may operate at least one of DU and RU of each of the grouped base stations 1, 2 and 4 in a single frequency mode or a multiple frequency mode.

In the meantime, although two single frequency modes and multiple frequency modes have been described in the above description, this is an embodiment.

For example, between the first critical load and the second critical load described above, a more subdivided critical load A may be specified. Here, the smallest critical load in the order of size will be the first critical load, the critical load A, and the second critical load.

If the total load of the grouped base stations 1, 2, and 4 is larger than the first threshold load and smaller than the threshold load A, the base station control apparatus 100 controls the grouped base stations 1, 2, For example, if the total load of the grouped base stations 1, 2, and 4 is greater than the threshold load A and smaller than the second threshold load, the grouped base stations 1, , 4 can be operated in a designated operation mode (e.g., a super cell mode for transmitting a reference signal RS for each terminal).

As described above, in the base station control apparatus according to the present invention, in a situation where base stations using different frequency bands coexist, with respect to a group of adjacent base stations having an overlapping relationship between cell coverage, By changing the operation mode so that the base stations use the same frequency band or use different frequency bands, the quality of the communication service that is adaptively provided to the terminal according to the occasionally varying load, and the base station radio resource capacity, And the like.

Hereinafter, an operation method of the base station control apparatus according to the present invention will be described with reference to FIG. 3 and FIG.

First, the operation flow of the communication system including the base station control apparatus according to the present invention will be described with reference to FIG.

The base station control apparatus 100 can group a plurality of base stations adjacent to each other among the plurality of base stations 10 described above (S10).

At this time, the base station control apparatus 100 can group a plurality of base stations based on the cell coverage of each base station. Hereinafter, with reference to FIG. 5, the case where the base stations 1, 2 and 4 are grouped into the group 1 will be described for convenience of explanation.

The base station control apparatus 100 confirms the load information for a plurality of grouped base stations, that is, the base stations 1, 2, and 4, with respect to the group 1 (S20). Here, the load information confirmed in step S20 may be load information obtained by analyzing load information collected during a specific period to the base stations 1, 2, and 4 and statistically processed.

Accordingly, the base station control apparatus 100 determines, based on the load information of the base stations 1, 2, and 4 confirmed as described above, May operate in a single frequency mode using the same single frequency band, or at least two of the grouped base stations 1, 2 and 4 may operate in a multi-frequency mode using different frequency bands.

For example, when the total load on the grouped base stations 1, 2, and 4 is equal to or greater than the second threshold load, the base station control apparatus 100 determines that the total load on the grouped base stations 1, (S30 Yes), the UE located in the cell coverage (C1, C2, C4) of the grouped base stations 1, 2 and 4 is referred to as a cell coverage (C1, C2, C4 (S40, S42, and S44).

Accordingly, each of the base stations 1, 2, and 4 performs a terminal transition process with the base station 5 according to the transition control of the base station control apparatus 100, and transitions the terminal located in its cell coverage to the base station 5.

The base station control apparatus 100 transitions the terminal located in the cell coverage (C1, C2, C4) of the grouped base stations 1, 2, and 4 to the base station 5 so that the number of terminals of the base stations 1, (S50), the grouped base stations 1, 2, and 4 may be controlled to operate in the multi-frequency mode described above (S60, S62, S64).

For example, the base station control apparatus 100 uses different frequency bands among at least two base stations, i.e., the base stations 1 and 2 overlapping among the grouped base stations 1, 2 and 4, The base station 1 and the base station 4 may use the first frequency band and the base station 2 may use the second frequency band to operate in the multiple frequency mode.

Accordingly, the base station 1 and the base station 4 are switched to the operation mode using the first frequency band under the control of the base station control device 100 and can provide the communication service to the terminal through the first frequency band (S70, S74) , The base station 2 is switched to the operation mode using the second frequency band and can provide the communication service to the terminal through the second frequency band (S72)

If it is determined in step S30 that the overall load on the base stations 1, 2, and 4 is not less than or equal to the first threshold load and not greater than the second threshold load (No in step D30) 1, 2, and 4 to the base stations 1, 2, and 4 in a basic operation mode using a predetermined basic frequency band (S80).

Hereinafter, an operation method of the base station control apparatus according to the preferred embodiment of the present invention will be described in detail with reference to FIG.

In the method of operating the base station control apparatus according to the present invention, among a plurality of base stations 10 described above, a plurality of base stations adjacent to each other are grouped (S100).

At this time, the operation method of the base station control apparatus according to the present invention can group a plurality of base stations based on the cell coverage of each base station.

The cell coverage of each of the plurality of grouped base stations is included in the cell coverage of a specific base station that is not included in the grouped base stations and is overlapped with the cell coverage of at least one base station among the plurality of grouped base stations .

More specifically, the operation method of the base station control apparatus according to the present invention can identify the base stations included in the cell coverage of one same specific base station based on the cell coverage of each of the plurality of base stations 10.

For example, referring to FIG. 5, an operation method of a base station control apparatus according to the present invention includes a base station 1, 2, 3, 4 included in a cell coverage C5 of one specific base station, Can be confirmed.

Accordingly, the method of operating the base station controller according to the present invention confirms the overlapping relationship between the cell coverage of the base stations included in the cell coverage of the specific base station, and identifies the base station overlapped with the cell coverage of at least one base station.

For example, referring to FIG. 5, an operation method of a base station control apparatus according to the present invention is a method of operating a base station control apparatus according to an embodiment of the present invention, It can be seen that the cell coverage (C1, C2, C4) of the base stations 1, 2 and 4 overlaps at least one cell coverage with each other.

The method for operating the base station control apparatus according to the present invention includes a base station 1, a base station 2, a base station 1, a base station 2, a base station 3, and a base station 4, Groups 2 and 4 can be grouped into one group 1. 5, the base stations 1, 2, and 4 of the grouped group 1 are included in the cell coverage C5 of the specific base station that is not included in the group 1, that is, the base station 5, and the cell coverage of the base station 1 is The cell coverage of the BS 2 overlaps with the cell coverage of the BS 2, and the cell coverage of the BS 4 overlaps with the cell coverage of the BS 2.

In the operation method of the base station control apparatus according to the present invention, load information for a plurality of grouped base stations is checked for each group grouped as described above (S110). Hereinafter, for convenience of explanation, the group 1 described above will be described.

That is, the method of operating the base station control apparatus according to the present invention confirms the load information for the plurality of grouped base stations, that is, the base stations 1, 2, and 4, with respect to the group 1 described above.

Here, the load information confirmed in step S110 may be load information obtained by analyzing load information collected during a specific period to the base stations 1, 2, and 4 and statistically processed.

More specifically, according to the first embodiment, the load information confirmed in step S110 is the load information collected in a predetermined time unit (for example, 5 seconds) during a specific period, for example, during a specific collection period The load information determined in step S110 may be the load information that is statistically processed according to the time zone, that is, the load pattern information, and the load information confirmed in step S110 may be the load information immediately before the predetermined time (for example, 10 minutes) The load information collected by the predetermined time unit (for example, 5 seconds) during the period may be analyzed and the load information may be statistically processed.

More specifically, the method of operation of the base station control apparatus according to the present invention can collect load information from each of the above-described plurality of base stations 10 at a predetermined time unit (e.g., 5 seconds).

Thus, according to the first embodiment described above, the method of operating the base station control apparatus according to the present invention is characterized in that, during a specific period, for example, from a group of base stations 1, 2, The load information collected by the designated time unit (for example, 5 seconds) is analyzed, and load information obtained by statistically processing each time zone of 1, 24, For example, minimum load, maximum load, average load, etc.).

That is, the operation method of the base station control apparatus according to the present invention confirms a load pattern indicating how the load of each of the base stations 1, 2, and 4 varies according to the time zone.

Accordingly, the method of operating the base station control apparatus according to the present invention is a method of operating the base stations 1, 2, and 4, in which the load information statistically processed, i.e., the load pattern information statistically processed for each time zone (e.g., (For example, minimum load, maximum load, average load, and the like) statistically processed for each time zone with respect to the grouped base stations 1, 2, and 4, (For example, minimum load, maximum load, average load, and so on) corresponding to the number of times of operation

According to the first embodiment, the method of operating the base station control apparatus according to the present invention further comprises the steps of: comparing the load information confirmed with the base stations 1, 2, and 4 grouped in step S110, that is, It is desirable to identify the pattern information (e.g., minimum load, maximum load, average load, etc.) as the total load for the grouped base stations 1,

Meanwhile, according to the above-described second embodiment, an operation method of the base station control apparatus according to the present invention is a method of operating the base station control apparatus according to the present invention for a predetermined period, for example, (Eg, minimum load, maximum load, average load, etc.) for each base station 1, 2, and 4 by analyzing the load information collected at a specified time unit (eg, 5 seconds) .

That is, the operation method of the base station control apparatus according to the present invention checks whether the load state immediately before the base stations 1, 2, and 4, for example, 10 minutes before.

Therefore, the method of operating the base station control apparatus according to the present invention is a method for checking the load information statistically processed for the grouped base stations 1, 2 and 4, that is, the previous load information (e.g., minimum load, maximum load, .

According to the second embodiment, the method of operating the base station control apparatus according to the present invention further comprises the steps of: comparing the load information confirmed with respect to the base stations 1, 2 and 4 grouped in step S110, that is, , Average load, etc.) as the total load on the grouped base stations 1, 2, and 4.

The operation method of the base station control apparatus according to the present invention is characterized in that the total load on the grouped base stations 1, 2, and 4 is determined according to the total load on the grouped base stations 1, 2, (S120 Yes), at least two of the grouped base stations 1, 2 and 4 are operated in the multi-frequency mode using different frequency bands.

More specifically, if the total load on the grouped base stations 1, 2, and 4 is equal to or greater than the second threshold load (S120 Yes), the method of operation of the base station control apparatus according to the present invention determines that the grouped base stations 1, The UEs located within the cell coverage C1, C2 and C4 of the base station 4 are allocated to the cell coverage C5 of the base station 5 including the cell coverage C1, C2 and C4 of the specific base station, (S130).

A method of operating a base station control apparatus according to the present invention includes switching a terminal located in cell coverage (C1, C2, C4) of a grouped base station 1, 2, 4 to a base station 5, After the number reaches 0, at least two of the grouped base stations 1, 2, and 4 are controlled to operate in a multi-frequency mode using different frequency bands (S140).

At this time, at least two or more base stations that use the above-described different frequency bands among the grouped base stations 1, 2, and 4 will be base stations having overlapping cell coverage.

That is, when the total load on the grouped base stations 1, 2, and 4 is equal to or greater than the second threshold load, the method of operating the base station control apparatus according to the present invention may use different frequency bands among the grouped base stations 1, At least two base stations can be identified. At this time, an operation method of the base station control apparatus according to the present invention is to check the cell coverage overlapping among the grouped base stations 1, 2 and 4 to a base station to use a different frequency band.

For example, referring to FIG. 5, among the grouped base stations 1, 2 and 4, the cell coverage is overlapped with the base station 1 and the base station 2, and the cell coverage is overlapped with the base station 2 and the base station 4. However, Are not overlapped with each other.

The method for operating the base station control apparatus according to the present invention is characterized in that at least two or more base stations 1, 2 and 4, which are grouped in step S140, use different frequency bands and overlap each other The base station 1 and the base station 4 may use the first frequency band and the base station 2 may use the second frequency band so that the different frequency bands may be used between the base station 2 and the base station 4. [

The operation method of the base station control apparatus according to the present invention is such that after switching the operation modes of the base stations 1, 2 and 4 grouped as described above to the multi-frequency mode, the existing load balancing It is preferable to distribute the load (load) according to the policy.

If the total load on the base stations 1, 2, and 4 is not equal to or greater than the second threshold load in step S120 (No in step S120), the method of operating the base station controller according to the present invention includes: (S150). If the total load is less than the first threshold load (S150).

If the total load on the grouped base stations 1, 2, and 4 is equal to or less than the first threshold load (Yes in S150), the method of operating the base station control apparatus according to the present invention is such that the cell coverage C1 C2, and C4 to the cell coverage C5 of the base station 5 including the cell coverage (C1, C2, C4) of the specific base station, i.e., the grouped base stations 1, 2, and 4 S160).

A method of operating a base station control apparatus according to the present invention includes switching a terminal located in cell coverage (C1, C2, C4) of a grouped base station 1, 2, 4 to a base station 5, The number of base stations 1, 2, and 4 is controlled to operate in a single frequency mode using the same single frequency band (e.g., the first frequency band) (S170).

The operation method of the base station control apparatus according to the present invention is a method in which after switching the operation modes of the base stations 1, 2 and 4 grouped as described above to the single frequency mode, It is preferable to distribute the load (load) according to the policy.

If it is determined in step S150 that the total load on the base stations 1, 2, and 4 is not less than the first threshold load (No in step S150), the grouped base stations 1, The basic operation mode using the set fundamental frequency band may be maintained (S180).

As described above, according to the method of operating the base station control apparatus according to the present invention, in a situation where base stations using different frequency bands coexist, in relation to a group of adjacent base stations having an overlapping relationship between cell coverage, Therefore, by considering the quality of the communication service and the base station radio resource capacity which are adaptively provided to the terminal according to the occasionally changing load, by changing the operation mode so that the base stations in the group use the same frequency band or use different frequency bands It is possible to efficiently operate the base station.

The method of operating the base station controller according to an embodiment of the present invention may be implemented in the form of a program command that can be executed through various computer means and recorded in a computer readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions recorded on the medium may be those specially designed and constructed for the present invention or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Magneto-optical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

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, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

According to the base station control apparatus and the base station control apparatus according to the present invention, in a situation where base stations using different frequency bands coexist, the frequency bands used between adjacent base stations are adaptively changed equally or differently to the load, It is possible to efficiently operate the base station considering both the quality of the communication service and the capacity of the base station radio resource. Therefore, in order to overcome the limitations of the existing technology, It is an invention that is industrially applicable because it has enough possibilities of business and can be practically and practically carried out.

10: plurality of base stations 100: base station control device
110: base station grouping unit 120: load information checking unit
130:

Claims (11)

A base station grouping unit for grouping a plurality of adjacent base stations;
A load information checking unit for checking load information on the plurality of grouped base stations; And
The method comprising: operating the grouped plurality of base stations in a single frequency mode in which all of the plurality of base stations use the same single frequency band according to a total load on the plurality of grouped base stations, And a base station controller for operating at least two base stations of the plurality of base stations in a multi-frequency mode using different frequency bands. The method according to claim 1,
The base station control unit,
If the total load on the plurality of grouped base stations is less than a first predetermined threshold load, operating the plurality of grouped base stations in the single frequency mode, and if the total load on the plurality of grouped base stations is equal to or greater than the second predetermined threshold load, And operates at least two base stations in the multi-frequency mode. The method according to claim 1,
Wherein the at least two base stations comprise:
Wherein the base station is a base station having cell coverage overlapping with each other. The method according to claim 1,
The base station grouping unit groups the base stations based on cell coverage of each of the plurality of base stations,
The cell coverage of each of the plurality of grouped base stations includes:
And is included in the cell coverage of a specific base station not included in the plurality of grouped base stations,
And the cell coverage of at least one of the plurality of grouped base stations is overlapped. 5. The method of claim 4,
The base station control unit,
Wherein the grouped base stations are operated in the single frequency mode or the multiple frequency mode after the UEs located within the cell coverage of the grouped base stations are transited to the cell coverage of the particular base station. Device. A base station grouping step of grouping a plurality of adjacent base stations;
A load information checking step of checking load information on the plurality of grouped base stations; And
The method comprising: operating the grouped plurality of base stations in a single frequency mode in which all of the plurality of base stations use the same single frequency band according to a total load on the plurality of grouped base stations, And a base station control step of operating at least two base stations of the plurality of base stations in a multi-frequency mode using different frequency bands. The method according to claim 6,
The base station controlling step includes:
And operating the grouped plurality of base stations in the single frequency mode if the total load on the plurality of grouped base stations is less than the predetermined first threshold load,
Wherein at least two of the plurality of grouped base stations operate in the multi-frequency mode if the total load on the plurality of grouped base stations is equal to or greater than a second predetermined threshold load. The method according to claim 6,
Wherein the at least two base stations comprise:
Wherein the base station is a base station having cell coverage overlapping with each other. The method according to claim 6,
The base station grouping step includes grouping based on cell coverage of each of the plurality of base stations,
The cell coverage of each of the plurality of grouped base stations includes:
And is included in the cell coverage of a specific base station not included in the plurality of grouped base stations,
Wherein the cell coverage of at least one of the plurality of grouped base stations is overlapped with the cell coverage of at least one other base station among the plurality of grouped base stations. 10. The method of claim 9,
The base station controlling step includes:
Wherein the grouped base stations are operated in the single frequency mode or the multiple frequency mode after the UEs located in the cell coverage of the grouped base stations are transited to the cell coverage of the particular base station. Method of operation of the device. The method according to claim 6,
Further comprising the step of analyzing and statistically processing load information collected during a specific period with respect to the plurality of grouped base stations;
The base station controlling step includes:
Wherein the plurality of grouped base stations are operated in the single frequency mode or in the multi-frequency mode according to the total load on the plurality of grouped base stations, which is confirmed based on the statistically processed load information, The base station control apparatus comprising:

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