KR20140009857A - Base station resource management device and performance method thereof - Google Patents

Abstract

Disclosed are a base station resource control device, an operating method thereof, and a base station device, capable of minimizing cell interference by selecting an interference base station which generates signal interference according to the existence of a terminal in a cell boundary region and/or a reception signal intensity among adjacent base stations which are checked by using adjacent base station information measured in the base station when base stations are densely located, determining a frequency resource about a cell central region and the cell boundary region of the base station to be adapted to the selected interference base station, and applying the determined result when the frequency resource is allocated to the terminal in the corresponding base station. [Reference numerals] (510) Adjacent base station information receiving unit; (520) Interference base station checking unit; (530) Control information determining unit; (540) Control information providing unit

Description

BASE STATION RESOURCE MANAGEMENT DEVICE AND PERFORMANCE METHOD THEREOF

The present invention relates to a base station resource control apparatus and a method for operating a base station resource control apparatus, and more particularly, by adjusting the frequency resources of the base station adaptively to the neighboring base station identified by using the neighbor base station information measured by the base station. The present invention relates to a base station resource control apparatus and a method for operating a base station resource control apparatus and a base station apparatus capable of minimizing interference.

A femto cell refers to an indoor base station for a very small, low power home or office, and is a small base station connected to a broadband router. The advantages of such femtocells can be reduced cell coverage in terms of eliminating shadow areas and cost in infrastructure construction.

Such small base stations are basically installed randomly at the request of the region or subscribers where data demand is expected to be high without any special installation plan by the operator. For this reason, the geographical location of the small base station However, it is difficult for an administrator to separately input neighboring base station information for interference control or fast handover. In order to solve this problem, a recent small base station measures a base station identifier (Cell ID) and a reference signal received power (RSRP) from a corresponding base station by receiving a downlink signal from a neighboring base station at system booting or periodically. It is equipped with the function to store in internal memory, and it is used for network performance improvement including handover performance improvement.

On the other hand, wireless networks operate with a frequency reuse coefficient of 1 because of the high scarcity of frequency resources. In this case, when the terminal is moved away from the parent base station to which the terminal is connected, the reception power of the desired signal is reduced due to the path loss of the signal radiated from the parent base station, while the reception power of the received interference signal is relatively close to the neighboring base station. Since it is increased, there is a problem in that reception performance is deteriorated due to an interference signal in a cell boundary region of a parent base station.

Accordingly, the present invention proposes a method of minimizing cell interference by adjusting frequency resources of a small base station adaptively to a neighboring base station identified by using neighboring base station information measured by the small base station.

The present invention has been made in view of the above circumstances, and an object of the present invention is to minimize cell interference by adjusting frequency resources of a base station adaptively to a neighboring base station identified by using neighboring base station information measured by the base station. The present invention provides a base station resource control apparatus, an operation method of the base station resource control apparatus, and a base station apparatus.

A base station resource control apparatus according to a first aspect of the present invention for achieving the above object comprises: a neighbor base station information receiver for receiving neighbor base station information associated with at least one neighbor base station adjacent to a specific base station; An interfering base station checking unit for identifying at least one interfering base station generating signal interference with respect to the specific base station among the at least one neighboring base station using the received neighbor base station information; And a control information determination unit for determining frequency resource control information of the specific base station so that signal interference between the specific base station and the at least one interfering base station is minimized.

Preferably, further comprising a control information providing unit for providing the frequency resource control information to the specific base station; The control information determiner may be configured such that the specific base station is located in a cell overlapping region where a cell region of the specific base station and a cell region of the at least one interfering base station overlap with each other based on the provided frequency resource control information. A different frequency band may be allocated to a terminal connected to the terminal and a terminal connected to the at least one interfering base station.

Preferably, the interfering base station checking unit, based on the received signal strength of the at least one neighboring base station identified in the neighboring base station information, a specific number of neighboring base stations having a small received signal strength sequentially from the largest received signal strength Can be identified as the interfering base station.

Preferably, the interfering base station checking unit, from the neighbor base station information to determine whether there is a terminal located in a cell boundary region of the cell area of each of the at least one neighboring base station, there is a terminal located in the cell boundary region The adjacent base station can be identified as the interfering base station.

Preferably, the frequency resource control information is allocated to a terminal connected in a cell boundary region within a first frequency band of all frequency bands, and the terminal connected in a cell central region assigns the first frequency band of the entire frequency band. The information may be allocated in the second frequency band, which is the remaining frequency band excluding.

Preferably, the frequency resource control information is assigned to a terminal connected to the cell boundary region of the specific base station, the specific frequency band of the first frequency band, the terminal connected to the cell boundary region of the at least one interfering base station May be information for allocating a frequency band different from the specific frequency band among the first frequency band.

Preferably, the first frequency band may be divided into one or more frequency bands based on the number of the at least one interference base station.

A base station apparatus according to a second aspect of the present invention for achieving the above object includes a neighboring base station information providing unit for providing neighboring base station information associated with at least one neighboring base station; And a resource control information receiver for receiving frequency resource control information determined to minimize signal interference with respect to at least one interfering base station which is determined to generate signal interference among the at least one neighboring base station using the neighboring base station information. do.

Preferably, on the basis of the frequency resource control information, the terminal connected in the cell boundary region is allocated a specific frequency band within the first frequency band of the entire frequency band, and the terminal connected in the cell central region is the one of the entire frequency band. It may include a resource allocation control unit for allocating in the second frequency band which is the remaining frequency band except the first frequency band.

Preferably, the specific frequency band may be different from a frequency band within the first frequency band allocated to a terminal connected in a cell boundary region of the at least one interfering base station.

A method of operating a base station resource control apparatus according to a third aspect of the present invention for achieving the above object comprises: receiving a neighbor base station information receiving neighbor base station information associated with at least one neighbor base station adjacent to a specific base station; An interference base station identification step of identifying at least one interference base station generating signal interference with respect to the specific base station among the at least one neighboring base station using the received neighbor base station information; And a control information determination step of determining frequency resource control information of the specific base station so that signal interference between the specific base station and the at least one interfering base station is minimized.

Preferably, the step of identifying the interference base station, based on the received signal strength of the at least one neighboring base station identified in the neighboring base station information, a predetermined number of neighbors having a small received signal strength sequentially from the largest received signal strength The base station can be identified as the interfering base station.

Preferably, the interfering base station confirmation step, from the neighbor base station information to determine whether the terminal located in the cell boundary region of the cell area of each of the at least one neighboring base station, there is a terminal located in the cell boundary region The adjacent base station can be identified as the interfering base station.

Preferably, the frequency resource control information is allocated to a terminal connected in a cell boundary region within a first frequency band of all frequency bands, and the terminal connected in a cell central region assigns the first frequency band of the entire frequency band. The information may be allocated in the second frequency band, which is the remaining frequency band excluding.

Preferably, the frequency resource control information is assigned to a terminal connected to the cell boundary region of the specific base station, the specific frequency band of the first frequency band, the terminal connected to the cell boundary region of the at least one interfering base station May be information for allocating a frequency band different from the specific frequency band among the first frequency band.

Preferably, the first frequency band may be divided into one or more frequency bands based on the number of the at least one interference base station.

Therefore, according to the operation method of the base station resource control apparatus and the base station resource control apparatus of the present invention, and the base station apparatus, in a situation where the base stations are densely packed, the received signal among the adjacent base stations confirmed by using the neighbor base station information measured by the base station Based on the strength and / or presence of the terminal in the cell boundary region, the interference base station generating signal interference is selected, and the frequency resources for the cell center region and the cell boundary region of the base station are determined by adaptively selecting the interference base station. By controlling the base station to apply when allocating frequency resources to the terminal, it is possible to minimize cell interference.

1 is a block diagram showing a communication system including a base station resource control apparatus and a base station apparatus according to a preferred embodiment of the present invention.
2 is a block diagram showing the configuration of a base station resource control apparatus according to a preferred embodiment of the present invention.
3 is a block diagram illustrating a configuration of a base station apparatus according to a preferred embodiment of the present invention.
4 is a flowchart illustrating an operation flow of a communication system including a base station resource control apparatus and a base station apparatus according to a preferred embodiment of the present invention.
5 is a control flowchart illustrating a method of operating a base station resource control apparatus according to a preferred embodiment of the present invention.
6 is a control flowchart illustrating a method of operating a base station apparatus according to a preferred embodiment of the present invention.
7 and 8 are exemplary diagrams showing a cell configuration and an example of allocation of frequency resources according to a preferred embodiment of 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 resource control apparatus and a base station apparatus according to a preferred embodiment of the present invention.

As shown in FIG. 1, a communication system including a base station resource control apparatus and a base station apparatus according to the present invention includes a plurality of base station apparatus 400 and a base station resource control apparatus 500.

Here, the plurality of base station apparatus 400 may include a small base station apparatus and a macro base station apparatus for constructing a small cell such as a femtocell, a picocell, and the like. Reference is made to this article.

In addition, the plurality of base station apparatus 400 may be based on operating its own frequency band allocation information with a frequency reuse factor of 1 because of the high rare value of the frequency resources.

The base station resource control apparatus 500 may directly communicate with a plurality of base station apparatus 400 to receive information, or interwork with a base station information DB 600 in which various information about the plurality of base station apparatus 400 is managed. Through the information from the plurality of base station apparatus 400 can be confirmed, and may be a central device for determining the frequency resource control information of the base station based on the identified information.

Here, the base station information DB 600, for each of a plurality of base station apparatus 400, adjacent base station information, information on the number of terminals connected in the cell boundary area among the connected terminals, frequency resource control information, etc. that have been previously determined and provided. It is desirable to store / manage it.

Hereinafter, for convenience of description, the base station 1 (100) of the plurality of base station apparatus 400 will be described with reference.

Base station 1 (100) receives a downlink signal from a neighboring base station periodically or when a predetermined measurement event occurs, the base station identifier (Cell ID), the signal reception power from the neighboring base station (RSRP: Reference Signal Received Power) Can be measured.

Accordingly, the base station 1 100 may provide the base station resource control apparatus 500 with neighbor base station information related to at least one neighbor base station measured as described above.

When the base station resource control apparatus 500 receives neighbor base station information related to a specific base station, that is, at least one neighbor base station adjacent to the base station 1 100, the base station 1 (100) of the at least one neighbor base station using the neighbor base station information. Identify at least one interfering base station causing signal interference.

In addition, the base station resource control apparatus 500 determines the frequency resource control information of the base station 1 (100) so that the signal interference between the base station 1 (100) and the at least one interfering base station identified is minimized, and the base station 1 (100) to provide.

Thus, the base station 1 100 may update its own frequency band allocation information based on the frequency resource control information provided from the base station resource control apparatus 500.

Therefore, when the base station 1 100 receives the channel quality information of the base station 1 100 from the connected terminal 10, the channel quality index (for example, CQI: channel quality indicator) or signal receiving power (CQI) checked therein Based on RSRP: Reference Signal Received Power, the position of the terminal 10 in the cell region of the base station 1 100 may be confirmed.

Accordingly, when it is determined that the terminal 10 is connected in the cell boundary region, the base station 1 100 may allocate the base station 1 100 according to its frequency band allocation information updated based on the frequency resource control information. A resource of a specific frequency band in the first frequency band among all frequency bands may be allocated to the terminal 10.

In this case, it is preferable that the specific frequency band is different from the frequency band in the first frequency band allocated to the terminal connected to the at least one interference base station identified in the cell boundary area.

On the other hand, when the base station 1 (100) is determined that the terminal 10 is connected in the cell center region, the base station 1 (100) can be allocated according to its frequency band allocation information updated based on the frequency resource control information. A resource of the second frequency band, which is the remaining frequency band except the first frequency band among all frequency bands, may be allocated to the terminal 10.

In the above description, the base station resource control apparatus 500 determines / provides the frequency resource control information for the base station 1 (100). However, this is an exemplary embodiment, and the base station resource control apparatus 500 manages each base station managed by the base station resource control apparatus 500. It is apparent that the frequency resource control information can be determined / provided for the 1,2 and 3 as described above.

Hereinafter, the configuration of the base station resource control apparatus of the present invention with reference to FIG. 2 in more detail.

The base station resource control apparatus 500 according to the present invention uses the neighbor base station information receiving unit 510 for receiving neighbor base station information associated with at least one neighboring base station adjacent to a specific base station, and the received neighbor base station information. Interference base station identification unit 520 for identifying at least one interfering base station that causes signal interference with respect to the specific base station of at least one neighboring base station, so that the signal interference between the specific base station and the at least one interfering base station is minimized And a control information determiner 530 for determining frequency resource control information of the specific base station.

The base station resource control apparatus 500 according to the present invention further includes a control information providing unit 540 for providing frequency resource control information to the specific base station.

The neighboring base station information receiving unit 510 receives neighboring base station information related to at least one neighboring base station adjacent to a specific base station, for example, base station 1 (100).

For example, the neighbor base station information may include a base station identifier (Cell ID) and a reference signal received power (RSRP) from the neighboring base station by receiving the downlink signal from at least one neighboring base station adjacent to the base station 1 (100). The measured information may be included, and may further include the information on the number of connected terminals located in the cell boundary region of the base station 1 (100).

The interfering base station confirming unit 520 identifies at least one interfering base station that causes signal interference with respect to a specific base station, that is, base station 1 (100) of the at least one neighboring base station by using the received neighbor base station information.

More specifically, according to an embodiment, the interfering base station confirming unit 520 may sequentially receive smallest signals from the largest received signal strength based on the received signal strengths of the at least one neighboring base station identified in the neighboring base station information. A specific number of neighboring base stations with signal strength can be identified as interfering base stations.

For example, the interfering base station checking unit 520 receives an increasingly smaller signal from the neighboring base station having the largest signal receiving power based on the received signal strength, that is, the signal receiving power (RSRP) of the neighboring base stations identified based on the neighboring base station information. A certain number of adjacent base stations (eg 2) can be identified as interfering base stations in order of adjacent base stations with power.

On the other hand, according to another embodiment, the interference base station identification unit 520, from the neighbor base station information to determine whether the terminal located in the cell boundary region of the cell area of each of the at least one neighboring base station, and located in the cell boundary region The neighboring base station in which the terminal exists can be identified as the interfering base station.

For example, the base station resource control apparatus 500 manages neighboring base station information for each base station 1, 2, and 3 managed by the base station resource control device 500 directly or through linkage with the base station information DB 600. ) Is located in the cell boundary area for each of the base stations 2, 3, and 4 based on the neighbor base station information of the base station (eg, base stations 2, 3, 4) identified as the neighbor base station in the neighbor base station information of the base station 1 (100). By checking the number information of the connected terminal it is possible to determine whether the terminal located in the cell boundary region.

The interference base station identification unit 520 can identify, as an interference base station, an adjacent base station in which at least one terminal located in the cell boundary area exists. For example, the number of terminals located in the cell boundary area of the base station 2 200 and connected to the base station 2 200 is 3, and the terminal located in the cell boundary area of the base station 3 300 and connected to the base station 3 300. If the number of times is 1 and the number of terminals located in the cell boundary area of the base station 4 and connected to the base station 4 is 0, the interfering base station confirming unit 520 will identify the base stations 2 and 3 as the interfering base station.

Prior to this, the interfering base station checking unit 520, based on the received signal strength, that is, the signal receiving power (RSRP) of the neighboring base stations confirmed based on the neighboring base station information, only for the neighboring base stations having a predetermined minimum signal strength or more. It is desirable to check whether or not.

The control information determining unit 530 is a signal between a specific base station, i.e., base station 1 (100) and at least one interfering base station, for example, base station 2 (200) and base station 3 (300) identified as the interfering base station by the interfering base station checking unit (520). The frequency resource control information of the base station 1 (100) is determined to minimize the interference.

Thus, the control information provider 540 will provide the determined frequency resource control information to the base station 1 (100).

Thus, the base station 1 (100), based on the frequency resource control information provided from the base station resource control device 500, the cell area of the base station 1 (100) and the cell of at least one interfering base station (for example, base station 2, 3) A different frequency band may be allocated to a terminal connected to base station 1 (100) and a terminal connected to at least one interfering base station (for example, base stations 2 and 3) among terminals located in a cell overlapping region where regions overlap.

In more detail below, the control information determining unit 530 will be described a specific embodiment of determining the frequency resource control information of the base station 1 (100).

Prior to this description, a cell center region and a cell boundary region of a base station will be described with reference to FIG. 7.

The cell area serviced by each base station (eg, base stations 1, 2, and 3) may include a cell center area and a cell boundary area.

The cell overlapping region described above overlaps the cell boundary region 1 of the base station 1 100 with the cell boundary region 2 of the interference base station, for example, the base station 2 200, and the cell boundary region 3 of the base station 3 300. It may mean an area that becomes.

Here, the cell area of each base station may be divided into a cell center area and a cell boundary area by a threshold value suggested by the base station resource control apparatus 500.

For example, in a specific function unit (not shown) of the base station resource control apparatus 500, an ECGI (E-UTRAN Cell Global Identifier) and PCI (Physical Cell ID) associated with each base station are identified. ), A virtual frequency resource map may be configured to collect Reference Signal Received Power (RSRP) to minimize collisions with interference signals transmitted from adjacent base stations. The frequency resource map may be configured in various ways according to a predefined interference control policy. For example, as illustrated in FIG. 7, the frequency resource map may have a cell coverage of a base station according to a degree of influence of an interference signal. It can be divided into three regions, that is, a cell center region and a cell boundary region.

Here, the threshold for distinguishing the cell center region and the cell boundary region is preferably presented by a specific function unit (not shown) of the base station resource control apparatus 500, and the threshold value presented from the base station resource control apparatus 500 is identified. The base station may determine whether the terminal connected in the cell area serviced by the base station itself is located in the cell center area or the cell boundary area according to the threshold.

Hereinafter, the control information determination unit 530 again describes a specific embodiment of determining the frequency resource control information of the base station 1 (100).

That is, the control information determining unit 530, if more than one interference base station exists as a result of the interference base station confirmation unit 520, base station 1 (100) and the interference base station, such as base station 2 (200), base station 3 The frequency resource control information of the base station 1 (100) is determined to minimize the signal interference between the 300.

The frequency resource control information determined at this time is allocated to a terminal connected to the cell boundary region 1 of the base station 1 100 within a first frequency band of all frequency bands, and to a terminal connected to the cell central region 1 of the entire frequency band. The information may be allocated in the second frequency band, which is the remaining frequency band except for the first frequency band.

In other words, the control information determining unit 530 is a frequency resource used in the cell center region 1 which is less affected by the interference signal from the interfering base station among the cell regions of the base station 1 100 and uses the second frequency band of the entire frequency bands. It is to determine the frequency resource control information to be allocated, and to be allocated within the first frequency band of all frequency bands as a frequency resource used in the cell boundary region 1 that is affected by the interference signal from the interference base station.

More specifically, the frequency resource control information determined by the control information determining unit 530 is configured to allocate a specific frequency band among the first frequency bands to a terminal connected in the cell boundary region 1 of the base station 1 100. It is preferable that the terminal connected to one of the interference base stations, for example, the cell boundary regions 2 and 3 of the base stations 2 and 3 is information for assigning a frequency band different from the specific frequency band among the first frequency bands.

In other words, the control information determination unit 530, if more than one interference base station exists as a result of the interference base station check unit 520, the cell center area 1 and cell boundary of the base station 1 (100) as follows: Determine frequency resource control information for region 2.

That is, the control information determining unit 530 affects the terminal connected to the cell center region 1 of the base station 1 100 in the second frequency band of all frequency bands, that is, the terminal connected to the cell center region 1 from signal interference. Since it is unlikely to receive a signal, it is possible to determine frequency resource control information for allocating a frequency resource of a fixed basic frequency band regardless of the interference base station.

Meanwhile, the control information determining unit 530 checks the first frequency band related to the cell boundary region 1 of the base station 1 100 among the entire frequency bands of the base station 1 100 by the interfering base station checking unit 520. Based on the number.

For example, the control information determining unit 530 determines a frequency reuse factor (eg 3), which is increased by 1 to the number of interference base stations (eg 2), and according to the determined frequency reuse factor (eg 3). The first frequency band can be divided into three.

Accordingly, the control information determining unit 530 divides the first frequency band into three of the frequency bands in the terminal connected in the cell boundary region 1 that is likely to be affected by signal interference in the cell region of the base station 1 100. Frequency resource control information for allocating frequency resources of a specific frequency band among one frequency band may be determined. The specific frequency band at this time will be different from the frequency band determined for the cell boundary regions 2 and 3 of the base stations 2 and 3, which are the interference base stations.

Meanwhile, in the above description, the base station 2, 3 is an interference base station based on the base station 1 (100). However, when the base station 2 (200) is referred to, the base station 1, 3 is an interference base station and the base station 3 (300) is referred to. Base stations 1 and 2 will be interfering base stations.

Accordingly, the control information determining unit 530 will also determine the frequency resource control information for each of the base stations 2 and 3, similarly to the frequency resource control information for the base station 1 described above, and with reference to FIG. An example of frequency resource allocation based on the frequency resource control information determined for each of 2, 3 will be described.

In other words, as described above, the control information determining unit 530 has no influence on the base station 1, regardless of the interfering base station in the entire frequency bands 0 to A, in relation to the cell center region which is less likely to be affected by signal interference. Allocating the frequency resources of the fixed basic frequency bands (B-A), that is, the second frequency band, and in relation to the cell boundary region, interfering base station with the first frequency band (0-B) of the entire frequency bands (0-A). Frequency resource control information for allocating frequency resources of a specific frequency band (for example, C to B) among frequency bands (0 to D, D to C, and C to B) classified based on the frequency reuse coefficient according to the number. You can decide.

In addition, the control information determining unit 530 is fixed to the base station 2 in a basic frequency band which is fixed regardless of the interfering base station among all the frequency bands 0 to A with respect to the cell center region which is less likely to be affected by signal interference. (B ~ A) That is, frequency resources of the second frequency band are allocated, and in relation to the cell boundary region, frequency reuse of the first frequency band (0 ~ B) of the total frequency bands (0 ~ A) according to the number of interfering base stations is performed. Frequency resource control information for allocating a frequency resource of a specific frequency band (eg, D-C) among the frequency bands 0 to D, D to C, and C to B classified based on a coefficient may be determined.

In addition, the control information determining unit 530 is fixed to the base station 3 in a basic frequency band fixed regardless of the interfering base station among the entire frequency bands 0 to A with respect to the cell center region which is less likely to be affected by signal interference. (B ~ A) That is, frequency resources of the second frequency band are allocated, and in relation to the cell boundary region, frequency reuse of the first frequency band (0 ~ B) of the total frequency bands (0 ~ A) according to the number of interfering base stations is performed. Frequency resource control information for allocating frequency resources of a specific frequency band (for example, 0-D) among the frequency bands 0 to D, D to C, and C to B classified based on coefficients may be determined.

In this way, the control information determination unit 530 assigns each of the base stations 1, 2, and 3 adjacent to each other to allocate the frequency resources of the common basic frequency bands B to A, that is, the second frequency band, to the cell center region. Frequency resource control information for allocating different frequency bands to the boundary region can be determined.

On the other hand, when the interference base station check result of the interference base station checking unit 520, the interference base station does not exist, that is, there is no adjacent base station having a reception signal strength greater than the minimum signal strength, or adjacent to one or more terminals connected to the cell boundary area If there is no base station, the control information determining unit 530 determines that there is no interfering base station that causes signal interference in the base station 1 (100), so that the base station 1 (100), the general frequency resource control information, for example, the base station 1 (100) In addition, the frequency resource control information for applying the frequency reuse factor of 1 to the entire cell area serviced by may be determined.

The control information providing unit 540 may provide the frequency resource control information determined by the control information determining unit 530 to the corresponding base station.

Hereinafter, the configuration of the base station apparatus according to the present invention will be described in detail with reference to FIG. 3. For convenience of description, reference will be made to the reference number of the base station 1 (100).

The base station apparatus 100 according to the present invention includes a neighbor base station information providing unit 110 for providing neighbor base station information related to at least one neighbor base station, and signal interference among the at least one neighbor base station using the neighbor base station information. And a resource control information receiver 120 for receiving the frequency resource control information determined to minimize signal interference with respect to the at least one interfering base station identified as generating the signal.

The neighboring base station information providing unit 110 provides neighboring base station information associated with at least one adjacent base station.

That is, the neighboring base station information providing unit 110 receives a downlink signal from a neighboring neighboring base station periodically or when a predetermined measurement event occurs, thereby receiving a base station identifier (Cell ID) and a signal receiving power (RSRP) from the neighboring base station. Reference Signal Received Power) may be measured, and adjacent base station information may be provided to the base station resource control apparatus 500.

In addition, the neighboring base station information providing unit 110, the base station resource control device 500 or the number information of the connected terminal located in the cell boundary region of its cell area, or further by using the base station information DB (600) Can provide.

The resource control information receiver 120 receives the frequency resource control information determined to minimize signal interference with respect to at least one interfering base station which is determined to generate signal interference among the at least one neighboring base station by using the neighboring base station information. do.

That is, the resource control information receiving unit 120 receives the frequency resource control information determined from the base station resource control apparatus 500 described above.

In addition, the base station apparatus 100 according to the present invention further includes a resource allocation control unit 130.

The resource allocation control unit 130 allocates a specific frequency band within the first frequency band among all frequency bands to a terminal connected in the cell boundary region based on the frequency resource control information determined by the base station resource control apparatus 500. Terminals connected in the region are allocated in the second frequency band which is the remaining frequency band except the first frequency band among the entire frequency bands.

In this case, the specific frequency band is different from the frequency band in the first frequency band allocated by the at least one interference base station to the terminal connected in the cell boundary region.

In more detail, the resource allocation control unit 130 may be based on operating its own frequency band allocation information with a frequency reuse factor of one.

The resource allocation control unit 130 may update its frequency band allocation information based on the frequency resource control information provided from the base station resource control apparatus 500.

Accordingly, the resource allocation control unit 130, when receiving the channel quality information about the base station apparatus 100 from the connected terminal 10, the channel quality index (for example, CQI: channel quality indicator) or signal reception power that is confirmed here A terminal in the cell region of the base station apparatus 100 based on a reference signal received power (RSRP) and a threshold value which is a criterion for distinguishing a cell central region and a cell boundary region in the cell region. The position of (10) can be confirmed.

When it is determined that the terminal 10 is connected in the cell center region, the resource allocation control unit 130 according to its frequency band allocation information updated based on the frequency resource control information, the entire frequency band that can be allocated ( A frequency resource of a basic frequency band (B-A), that is, a second frequency band, which is fixed regardless of the interfering base station among 0-A) may be allocated to the terminal 10.

On the other hand, when it is determined that the terminal 10 is connected in the cell boundary region, the resource allocation control unit 130 according to its frequency band allocation information updated based on the frequency resource control information, all the allocable frequencies of the resource allocation controller 130. Particular frequency bands among the frequency bands 0 to D, D to C, and C to B that divide the first frequency band 0 to B among the bands 0 to A based on the frequency reuse coefficient according to the number of interfering base stations. (Eg, C to B) resources may be allocated to the terminal 10.

At this time, the specific frequency band is a frequency band in the first frequency band (0 ~ D, D assigned by the at least one interference base station (for example, base stations 2, 3) identified above to the terminal connected in its cell boundary region) It is preferable that it is different from -C).

Meanwhile, general frequency resource control information according to the determination that there is no interference base station for the base station apparatus 100 from the base station resource control apparatus 500, for example, the frequency reuse coefficient for the entire cell area serviced by the base station apparatus 100. In the case of receiving the frequency resource control information for applying 1, the resource allocation control unit 130, the terminal 10 is located in the cell center region or the cell boundary region, regardless of whether the allocated all frequency bands Frequency resources can be allocated from 0 to A.

As described above, according to the base station resource control apparatus and the base station apparatus according to the present invention, in a situation where the base stations are densely packed, the received signal strength and / or among the adjacent base stations confirmed by using the neighbor base station information measured by the base station. Based on the existence of the terminal in the cell boundary region, the interference base station generating signal interference is selected, and the frequency resources for the cell center region and the cell boundary region of the base station are determined adaptively to the selected interfering base station, By controlling to apply when allocating frequency resources, cell interference can be minimized.

Therefore, according to the base station resource control apparatus according to the present invention, since cell interference can be minimized in a situation where the base stations are densely packed, it is possible to improve the transmission rate at the cell boundary and to improve the downlink transmission rate and the handover success rate. have.

Hereinafter, an operation method of a base station resource control apparatus and a base station apparatus according to the present invention will be described with reference to FIGS. 4 to 6.

First, an operation flow of a communication system including a base station resource control apparatus and a base station apparatus according to the present invention will be described with reference to FIG. 4.

Base station 1 (100) receives a downlink signal from a neighboring base station periodically or when a predetermined measurement event occurs, the base station identifier (Cell ID), the signal reception power from the neighboring base station (RSRP: Reference Signal Received Power) It can be measured (S10).

Base station 1 (100) may provide the neighbor base station information associated with at least one neighboring base station to the base station resource control apparatus 500 (S20).

When the base station resource control apparatus 500 receives neighbor base station information related to at least one neighboring base station adjacent to the base station 1 100, the base station resource control apparatus 500 uses the neighbor base station information to signal the base station 1 100 of the at least one neighboring base station. At least one interference base station causing interference is identified (S30).

Then, the base station resource control apparatus 500 determines the frequency resource control information of the base station 1 (100) so that the signal interference between the base station 1 (100) and the at least one interfering base station confirmed (S40), the base station 1 ( 100) (S50).

Thus, the base station 1 100 may update its own frequency band allocation information based on the frequency resource control information provided from the base station resource control apparatus 500.

Accordingly, when the base station 1 100 receives the channel quality information of the base station 1 100 from the connected terminal 10 (S60), the channel quality index (eg, CQI: channel quality indicator) or the like is checked here. Based on the reference signal received power (RSRP), the position of the terminal 10 in the cell region of the base station 1 100 may be checked (S70).

Accordingly, when it is determined that the terminal 10 is connected in the cell boundary region, the base station 1 100 may allocate the base station 1 100 according to its frequency band allocation information updated based on the frequency resource control information. A resource of a specific frequency band within the first frequency band among all frequency bands may be allocated to the terminal 10 (S80).

In this case, it is preferable that the specific frequency band is different from the frequency band in the first frequency band allocated to the terminal connected to the at least one interference base station identified in the cell boundary area.

Hereinafter, an operation method of the base station resource control apparatus according to the present invention will be described in more detail with reference to FIG. 5.

The method for operating a base station resource control apparatus according to the present invention receives neighbor base station information related to at least one neighbor base station adjacent to a specific base station, for example, base station 1 (100) (S100).

A method of operating a base station resource control apparatus according to the present invention, by using the received neighbor base station information, at least one interfering base station for generating signal interference to a specific base station, that is, base station 1 (100) of the at least one neighboring base station. Check (S110).

In more detail, according to one embodiment, the operation method of the base station resource control apparatus according to the present invention is based on the received signal strength, that is, the signal receiving power (RSRP) of the neighboring base stations identified based on the neighboring base station information. A specific number (eg 2) of neighboring base stations can be identified as an interfering base station in order from neighboring base stations with large signal receiving power to neighboring base stations with smaller signal receiving power.

On the other hand, according to another embodiment, the operation method of the base station resource control apparatus according to the present invention, from the neighbor base station information by checking the presence of the terminal located in the cell boundary region of the cell area of each of the at least one neighboring base station, the cell The neighboring base station in which the terminal located in the boundary area exists can be identified as the interfering base station.

For example, the base station resource control apparatus 500 manages neighboring base station information for each base station 1, 2, and 3 managed by the base station resource control device 500 directly or through linkage with the base station information DB 600. The operation method of the control device is a cell boundary for each of the base stations 2, 3, 4 based on the neighbor base station information of the base station (eg, base stations 2, 3, 4) identified as the neighbor base station in the neighbor base station information of the base station 1 (100). By checking the number information of the connected terminals located in the area, it is possible to confirm the existence of the terminal located in the cell boundary area.

Accordingly, in the method for operating a base station resource control apparatus according to the present invention, it is possible to identify an adjacent base station in which at least one terminal located in a cell boundary region exists as an interference base station.

Prior to this, the method for operating a base station resource control apparatus according to the present invention includes neighboring base stations having a predetermined minimum signal strength or more based on received signal strength, that is, signal reception power (RSRP) of neighboring base stations identified based on the neighboring base station information. It is advisable to check whether it is an interfering base station only.

Accordingly, in the method of operating the base station resource control apparatus according to the present invention, if the interference base station does not exist as a result of checking the interference base station as described above, that is, there is no neighboring base station having a reception signal strength greater than the minimum signal strength or the cell boundary region. If there is no adjacent base station to which at least one terminal is connected, the base station 1 100 determines that there is no interfering base station that generates signal interference. The frequency resource control information for applying the frequency reuse factor of 1 to the entire cell area serviced by S may be determined (S160).

On the other hand, the operation method of the base station resource control apparatus according to the present invention, if there is an interference base station, between the base station 1 (100) and at least one interfering base station identified as the interfering base station, such as base station 2 (200), base station 3 (300) Frequency resource control information of the base station 1 (100) is determined so that signal interference is minimized (S130 to S150).

More specifically, the operation method of the base station resource control apparatus according to the present invention, the base station of the base station 1 (100) of the interference base station that confirmed the first frequency band associated with the cell boundary region 1 of the base station 1 (100) Based on the number.

For example, in the method for operating a base station resource control apparatus according to the present invention, the frequency reuse factor (eg, 3) is increased by increasing 1 to the number of interference base stations (eg, 2) (S130), and the determined frequency reuse factor is determined. According to (Example 3), the first frequency band may be divided into three (S140).

Accordingly, in the method of operating the base station resource control apparatus according to the present invention, a terminal connected to a cell boundary region 1 that is likely to be affected by signal interference in the cell region of the base station 1 100 is a first frequency band of all frequency bands. Frequency resource control information for allocating frequency resources of a specific frequency band among the frequency bands divided into three can be determined (S150). The specific frequency band at this time will be different from the frequency band determined for the cell boundary regions 2 and 3 of the base stations 2 and 3, which are the interference base stations.

In addition, the operation method of the base station resource control apparatus according to the present invention, the terminal connected to the cell center region 1 of the base station 1 (100) in the second frequency band of the entire frequency band, that is, the terminal connected to the cell center region 1 Since it is less likely to be affected by signal interference, it is possible to determine frequency resource control information for allocating frequency resources of a fixed basic frequency band regardless of the interference base station among all frequency bands (S150).

In the method of operating the base station resource control apparatus according to the present invention, the determined frequency resource control information is provided to the base station 1 (100) (S170), the base station 1 (100) by reflecting its frequency band allocation information in the terminal to the frequency By controlling to apply when allocating resources, cell interference can be minimized.

Hereinafter, an operation method of a base station apparatus according to the present invention will be described in detail with reference to FIG. 6.

In the method of operating a base station apparatus according to the present invention, the base station identifier (Cell ID) and a signal reception power (RSRP) from a neighboring base station are received by receiving a downlink signal from a neighboring neighboring base station periodically or when a predetermined measurement event occurs. Reference Signal Received Power) may be measured, and the neighboring base station information may be provided to the base station resource control apparatus 500 according to the above (S200).

In an operation method of a base station apparatus according to the present invention, frequency resource control information determined to minimize signal interference with respect to at least one interfering base station which is determined to generate signal interference among the at least one neighboring base station using neighboring base station information. Receive (S210).

That is, the method of operating the base station apparatus according to the present invention receives the frequency resource control information determined from the base station resource control apparatus 500 described above.

In the operation method of the base station apparatus according to the present invention, based on the frequency resource control information determined from the base station resource control apparatus 500, the terminal connected in the cell boundary region is assigned a specific frequency band in the first frequency band of the entire frequency band The terminal connected in the cell center region is allocated in the second frequency band, which is the remaining frequency band except the first frequency band among the entire frequency bands.

In this case, the specific frequency band is different from the frequency band in the first frequency band allocated by the at least one interference base station to the terminal connected in the cell boundary region.

More specifically, the method of operating the base station apparatus according to the present invention may be based on operating its own frequency band allocation information with a frequency reuse factor of one.

The operation method of the base station apparatus according to the present invention may update its frequency band allocation information based on the frequency resource control information provided from the base station resource control apparatus 500.

Accordingly, in the method of operating the base station apparatus according to the present invention, when the channel quality information about the base station apparatus 100 is reported from the connected terminal 10, the channel quality index (eg, CQI: channel quality indicator) or the like is checked here. A cell of the base station apparatus 100 based on a reference signal received power (RSRP) and a threshold value presented from the base station resource control apparatus 500, that is, a threshold that is a criterion for distinguishing a cell center region and a cell boundary region in a cell region. The location of the terminal 10 in the area may be checked (S230).

In the operation method of the base station apparatus according to the present invention, when it is determined that the terminal 10 is connected in the cell center region, all of the base station apparatus according to the present invention can be allocated according to its frequency band allocation information updated based on the frequency resource control information. A frequency resource of a basic frequency band B-A, that is, a second frequency band, which is fixed regardless of the interference base station among the frequency bands 0 to A may be allocated to the terminal 10 (S250).

On the other hand, in the operation method of the base station apparatus according to the present invention, when it is determined that the terminal 10 is connected in the cell boundary region, according to its own frequency band allocation information updated based on the frequency resource control information, Of the possible frequency bands (0 ~ A), among the frequency bands (0 ~ D, D ~ C, C ~ B) that divide the first frequency band (0 ~ B) based on the frequency reuse coefficient according to the number of interfering base stations. A resource of a specific frequency band (for example, C to B) may be allocated to the terminal 10 (S240).

At this time, the specific frequency band is a frequency band in the first frequency band (0 ~ D, D assigned by the at least one interference base station (for example, base stations 2, 3) identified above to the terminal connected in its cell boundary region) It is preferable that it is different from -C).

Meanwhile, general frequency resource control information according to the determination that there is no interference base station for the base station apparatus 100 from the base station resource control apparatus 500, for example, the frequency reuse coefficient for the entire cell area serviced by the base station apparatus 100. In the case of receiving the frequency resource control information to apply the 1, the method of operation of the base station apparatus according to the present invention is capable of assigning itself regardless of whether the terminal 10 is located in the cell center region or the cell boundary region. Frequency resources may be allocated in all frequency bands 0 to A.

As described above, according to the operating method of the base station resource control apparatus according to the present invention, in a situation where the base stations are densely packed, the received signal strength and / or the received base station among the adjacent base stations confirmed by using the neighbor base station information measured by the base station. Based on the existence of the terminal in the cell boundary region, the interference base station generating signal interference is selected, and the frequency resources for the cell center region and the cell boundary region of the base station are determined adaptively to the selected interfering base station, By controlling to apply when allocating frequency resources, cell interference can be minimized.

Therefore, according to the operating method of the base station resource control apparatus according to the present invention, since cell interference can be minimized in a situation where the base stations are densely packed, the transmission rate at the cell boundary is improved, and the downlink transmission rate and handover success rate are improved. Can be induced.

The operation method of the base station resource control apparatus and the operation method of the base station apparatus according to an embodiment of the present invention can be implemented in the form of program instructions that can be executed by various computer means can be 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 an operation method of a base station resource control apparatus and a base station resource control apparatus according to the present invention, and a base station apparatus, in a situation where the base stations are densely packed, the received signal strength of the adjacent base station confirmed by using the neighbor base station information measured by the base station And / or selecting an interference base station generating signal interference according to the presence of a terminal in the cell boundary region, and adaptively determining the frequency resources for the cell center region and the cell boundary region of the base station according to the selected interference base station. In order to minimize the cell interference by controlling to apply when allocating the frequency resources to the terminal in the terminal, the possibility of the commercialization or sales of the applied device is not sufficient as the use of the related technology, as it overcomes the limitations of the existing technology. In addition, because it is practically evident, the industrial applicability It is an invention.

10: terminal 400: a plurality of base station apparatus
500: base station resource control device 600: base station information DB

Claims (15)

A neighbor base station information receiver for receiving neighbor base station information associated with at least one neighbor base station adjacent to a specific base station;
An interfering base station checking unit for identifying at least one interfering base station generating signal interference with respect to the specific base station among the at least one neighboring base station using the received neighbor base station information; And
And a control information determination unit for determining frequency resource control information of the specific base station so that signal interference between the specific base station and the at least one interfering base station is minimized. The method of claim 1,
A control information providing unit for providing the frequency resource control information to the specific base station;
The control information determining unit,
The terminal connected to the specific base station among the terminals located in a cell overlapping region where the cell region of the specific base station and the cell region of the at least one interfering base station overlap with each other based on the provided frequency resource control information; A base station resource control apparatus characterized by allowing different frequency bands to be allocated to a terminal connected to at least one interfering base station. The method of claim 1,
The interference base station confirmation unit,
On the basis of the received signal strength of the at least one neighboring base station identified in the neighboring base station information, identifying a specific number of neighboring base stations having the smallest received signal strength sequentially from the largest received signal strength as the interference base station; Base station resource control device. The method of claim 1,
The interference base station confirmation unit,
Confirming whether there is a terminal located in a cell boundary region among cell areas of each of the at least one neighboring base station from the neighbor base station information, and confirming the neighboring base station where the terminal located in a cell boundary region exists as the interference base station. Base station resource control device characterized in that. The method of claim 1,
The frequency resource control information,
The terminal connected in the cell boundary region is allocated within the first frequency band among all frequency bands, and the terminal connected in the cell center region is allocated in the second frequency band, which is the remaining frequency band except for the first frequency band among the all frequency bands. Base station resource control device, characterized in that the information to enable. The method of claim 5, wherein
The frequency resource control information,
A specific frequency band of the first frequency band is allocated to a terminal connected in a cell boundary region of the specific base station, and a specific frequency band of the first frequency band is assigned to a terminal connected in a cell boundary region of the at least one interfering base station. And the base station resource control apparatus, which is information for allocating a different frequency band. The method according to claim 5 or 6,
And the first frequency band is divided into one or more frequency bands based on the number of the at least one interference base station. A neighboring base station information providing unit for providing neighboring base station information related to at least one neighboring base station; And
A resource control information receiver configured to receive frequency resource control information determined to minimize signal interference with respect to at least one interfering base station determined to generate signal interference among the at least one neighboring base station using the neighboring base station information; Base station apparatus, characterized in that. The method of claim 8,
Based on the frequency resource control information, the terminal connected in the cell boundary region is allocated a specific frequency band within the first frequency band among all frequency bands, and the terminal connected in the cell central region is the first frequency band among the entire frequency bands. And a resource allocation control unit for allocating the second frequency band which is the remaining frequency band. The method of claim 9,
The specific frequency band,
And a frequency band different from a frequency band within the first frequency band allocated to a terminal connected in a cell boundary region of the at least one interfering base station. A neighbor base station information receiving step of receiving neighbor base station information related to at least one neighbor base station adjacent to a specific base station;
An interference base station identification step of identifying at least one interference base station generating signal interference with respect to the specific base station among the at least one neighboring base station using the received neighbor base station information; And
And a control information determining step of determining frequency resource control information of the specific base station so that signal interference between the specific base station and the at least one interfering base station is minimized. The method of claim 11,
The interference base station identification step,
On the basis of the received signal strength of the at least one neighboring base station identified in the neighboring base station information, identifying a specific number of neighboring base stations having the smallest received signal strength sequentially from the largest received signal strength as the interference base station; Operation method of the base station resource control device. The method of claim 11,
The interference base station identification step,
Confirming whether there is a terminal located in a cell boundary region among cell areas of each of the at least one neighboring base station from the neighbor base station information, and confirming the neighboring base station where the terminal located in a cell boundary region exists as the interference base station. A method of operating a base station resource control device characterized in that. The method of claim 11,
The frequency resource control information,
The terminal connected in the cell boundary region is allocated within the first frequency band among all frequency bands, and the terminal connected in the cell center region is allocated in the second frequency band, which is the remaining frequency band except for the first frequency band among the all frequency bands. Method of operation of the base station resource control device, characterized in that the information to enable. 15. The method of claim 14,
The frequency resource control information,
A specific frequency band of the first frequency band is allocated to a terminal connected in a cell boundary region of the specific base station, and a specific frequency band of the first frequency band is assigned to a terminal connected in a cell boundary region of the at least one interfering base station. And information for allocating a different frequency band from the base station resource control apparatus.

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