KR102403440B1 - Device, method and computer program for grouping copy cells to reduce interference of wireless communication system - Google Patents

Abstract

A copy cell grouping method for reducing interference in a wireless communication system is disclosed. A copycell grouping method for reducing interference in a wireless communication system according to the present invention includes: obtaining received signal strengths between a plurality of RUs in a copycell group derivation area and a plurality of reception areas; based on the received signal strengths, the Selecting an RU to be a communication target of each of the plurality of reception areas from among a plurality of RUs, obtaining a weighted amount of interference between the plurality of RUs by performing obtaining a weighted amount of interference for the plurality of RUs, and the plurality of grouping copycell groups based on a weighted amount of interference between a plurality of copycell groups composed of RUs of The obtaining includes: obtaining a weighted interference amount in which interference amounts and area weights by other RUs are reflected in reception areas having the same RU as communication targets.

Description

A copy cell grouping device for reducing interference in a wireless communication system, a copy cell grouping method, and a computer program stored in a medium to perform the copy cell grouping method {DEVICE, METHOD AND COMPUTER PROGRAM FOR GROUPING COPY CELLS TO REDUCE INTERFERENCE OF WIRELESS COMMUNICATION SYSTEM}

The present invention performs a copy cell grouping apparatus, a copy cell grouping method, and a copy cell grouping method for reducing interference in a wireless communication system, which derives an optimal copy cell group that minimizes interference between base stations by using a weighted interference amount between RUs It relates to a computer program stored in a medium for

In LTE or 5G, a base station consists of a data processing unit (DU) that processes baseband data and a radio transmission/reception unit (RU) in charge of transmitting and receiving radio waves.

Previously, it was common for DU and RU to be located in one base station equipment, but recently, DU and RU are separated, DU is placed in a centralized station such as a telephone office, RU is placed in a service area, and DU and RU are connected by optical cables. - RAN (Centralized / Cloud RAN) structure is widely used.

The RU may operate in a master mode that transmits an independent signal like a conventional base station according to a user's setting, or may operate in a copy cell mode that copies and transmits the same signal as the master cell like a repeater.

On the other hand, when the RU operates in the copy cell mode, there is a disadvantage in that the available capacity cannot be utilized when the RU operates as the master cell.

However, when the RU operates in the copy cell mode, since it transmits the same signal as the master cell, there is no signal interference with the master cell and no handover occurs between the master cell and the copy cell.

Because of these characteristics of copy cells, wireless carriers may operate some RUs as copy cells to mitigate interference in urban areas with severe interference, and in the case of LTE-R (Railway) systems, the hand of a train moving at high speed In order to reduce the number of overs, there are cases in which adjacent cells are grouped into the same copy cell and operated.

Meanwhile, since interference between base stations or usable capacity varies depending on the operation of the copy cell group, the copy cell group design should be designed in a scientific way in consideration of interference and capacity.

However, the copycell group is intuitively designed based on the experience of field engineers or the quality evaluation of customers, and an optimized design to minimize interference between base stations has not been made.

The present invention is to solve the above problems, and an object of the present invention is to derive an optimal copy cell group that minimizes interference between base stations using weighted interference between RUs, copy cell grouping for reducing interference in a wireless communication system This is to provide an apparatus, a copy cell grouping method, and a computer program stored in a medium for performing the copy cell grouping method.

A copycell grouping method for reducing interference in a wireless communication system according to the present invention includes: obtaining received signal strengths between a plurality of RUs in a copycell group derivation area and a plurality of reception areas; based on the received signal strengths, the Selecting an RU to be a communication target of each of the plurality of reception areas from among a plurality of RUs, obtaining a weighted amount of interference between the plurality of RUs by performing obtaining a weighted amount of interference for the plurality of RUs, and the plurality of grouping copycell groups based on a weighted amount of interference between a plurality of copycell groups composed of RUs of The acquiring includes acquiring a weighted interference amount in which interference amounts by other RUs and area weights are reflected in reception areas having the same RU as communication targets.

In this case, the area weight may be assigned a higher value to a reception area requiring high radio quality compared to a reception area requiring low radio quality.

In this case, the area weight may be assigned a higher value to the reception area located in the densely populated area than to the reception area located in the sparsely populated area.

On the other hand, the area weight is assigned a higher value to the receiving area located on the main road than the receiving area located on the back road, and compared to the receiving area located on the main road. A higher value may be assigned.

Meanwhile, the step of obtaining a weighted interference amount reflecting interference by other RUs and an area weight in reception areas having the same RU as a communication target includes multiplying the product of the signal strength of the first RU among the other RUs by the area weight. Acquiring a weighted interference amount by the first RU in the communication area of the same RU by performing and summing the reception areas having an RU as a communication target, and signal strength of a second RU among the other RUs and obtaining the weighted interference amount by the second RU in the communication area of the same RU by performing the product of the area weight with the same RU for the reception areas having the same RU as a communication target and adding them.

In this case, the step of performing the product of the signal strength of the first RU among the other RUs and the area weight for the reception areas having the same RU as the communication target includes: obtaining a product of a signal strength of the first RU received in a reception area and a weight assigned to the first reception area; and obtaining a product of the signal strength of the first RU and a weight assigned to the second reception area.

Meanwhile, the grouping of the copycell groups based on the weighted interference amount between the plurality of copycell groups including the plurality of RUs may include: based on the weighted interference amount between the plurality of copycell groups including the plurality of RUs The method may include grouping the copy cell groups having the largest amount of weighted interference into one copy cell group.

In this case, the grouping of the copycell groups having the largest amount of mutually weighted interference into one copycell group includes: grouping the plurality of RUs into a plurality of copycell groups each having one element; grouping the first copy cell group and the second copy cell group into one specific copy cell group when the weighted interference amount between the first copy cell group and the second copy cell group is the greatest among the copy cell groups of may include

In this case, the grouping of the copy cell groups having the largest amount of mutually weighted interference into one copy cell group includes 'A group other than the first copy cell group and the second copy cell group among the plurality of copy cell groups. The method may further include grouping copycell groups having the greatest amount of weighted interference into one copycell group based on the weighted interference amount between the groups with respect to ' and the specific copycell group.

In this case, the weighted interference amount between the specific copy cell group and the remaining copy cell groups is the 'weighted interference amount between the first copy cell group and the remaining copy cell groups' and 'the second copy cell group and the remaining copy cell groups. It may be the sum of 'weighted interference between groups.

In this case, the grouping of the copycell groups having the largest mutually weighted interference amount into one copycell group may include grouping the copycell groups having the largest mutually weighted interference amount when the maximum number of elements exceeds the maximum number of elements. The method may further include grouping the copy cell groups.

Meanwhile, in the grouping of the copycell groups having the greatest amount of mutually weighted interference into one copycell group, grouping of the copycell group having the maximum number of elements is stopped and grouping of the remaining copycell groups is performed. It may further include the step of

In this case, the step of stopping grouping on the copy cell group having the maximum number of elements and performing grouping on the remaining copy cell groups may include: The weighted interference amount may be set to 0, and grouping may be performed on the remaining copy cell groups.

On the other hand, when the grouping is completed by repeating the grouping of the copy cell groups having the largest amount of mutually weighted interference into one copy cell group, a specific RU in the copy cell group for which the grouping is completed operates as a master cell, and the grouping is completed. Another RU in the group may further include operating as a copy cell.

The copy cell grouping apparatus according to the present invention includes an input unit for obtaining received signal strengths between a plurality of RUs in a copy cell group derivation area and a plurality of reception areas, and the plurality of RUs among the plurality of RUs based on the received signal strengths. Selecting a communication target RU in each reception area, and obtaining a weighted interference amount between the plurality of RUs by performing acquisition of the weighted interference amount for the plurality of RUs, between a plurality of copy cell groups composed of the plurality of RUs and a control unit for grouping copy cell groups based on a weighted interference amount, wherein the control unit obtains a weighted interference amount reflecting the area weight and the interference amount by other RUs in reception areas having the same RU as a communication target.

In this case, the area weight may be assigned a higher value to a reception area requiring high radio quality compared to a reception area requiring low radio quality.

Meanwhile, the control unit performs the multiplication of the signal strength and the area weight of the first RU among the other RUs for the reception areas having the same RU as a communication target and then sums them, so that the first RU in the communication area of the same RU is summed. A communication area of the same RU by obtaining a weighted interference amount by an RU, performing the product of a signal strength of a second RU among the other RUs and an area weight on reception areas having the same RU as a communication target, and then summing them may obtain the weighted interference amount by the second RU in .

In this case, the step of performing, by the control unit, a product of a signal strength of a first RU among the other RUs and an area weight for reception areas having the same RU as a communication target, includes: a reception area using the same RU as a communication target Among them, the product of the signal strength of the first RU received in the first reception area and the weight assigned to the first reception area is obtained, and received in the second reception area among the reception areas with the same RU as a communication target. A product of the signal strength of the first RU and a weight assigned to the second reception area may be obtained.

Meanwhile, the control unit may group copy cell groups having the largest amount of weighted interference into one copy cell group based on the weighted interference amount between the plurality of copy cell groups including the plurality of RUs.

On the other hand, the computer program stored in the medium for performing the copy cell grouping method according to the present invention obtains received signal strengths between a plurality of RUs in a copy cell group derivation area and a plurality of reception areas, based on the received signal strengths. , selecting an RU to be a communication target of each of the plurality of reception areas from among the plurality of RUs, acquiring a weighted interference amount between the plurality of RUs by performing acquisition of a weighted interference amount for the plurality of RUs, and; grouping copycell groups based on a weighted amount of interference between the plurality of copycell groups configured with the plurality of RUs, and performing weighting between the plurality of RUs by obtaining the weighted amount of interference for the plurality of RUs; The step of obtaining the interference amount may include obtaining a weighted interference amount reflecting the area weight and the amount of interference by other RUs in reception areas having the same RU as a communication target.

According to the present invention, it is possible to improve the quality of a wireless network by deriving an optimal copy cell group that minimizes interference when operating an LTE/5G base station. Accordingly, the user may be provided with improved signal quality and throughput.

According to the present invention, interference mitigation is possible in an urban area with severe interference, and there is an advantage in that frequent handover can be prevented in a situation in which the terminal moves at high speed, such as in the LTE-R system.

In the present invention, by using a weighted interference amount, grouping is performed in consideration of not only interference between RUs but also characteristics of a reception area. Accordingly, there is an advantage in that an improved service can be preferentially provided to a reception area requiring higher radio quality.

1 is a view for explaining a copy cell grouping apparatus according to the present invention.
2 is a flowchart illustrating a copy cell grouping method for reducing interference in a wireless communication system according to the present invention.
3 is a result of predicting SS-RSRP, which is the received signal strength of a synchronization signal, which is a control signal of 5G, in a plurality of reception areas.
4 is a diagram illustrating a region weight assigned according to the characteristics of a reception region.
5 is an example in which the weighted interference calculated by the above method is configured in a matrix.
6 is a flowchart illustrating a method of grouping copy cell groups.
7 is a diagram illustrating a result of grouping a first copy cell group and a second copy cell group into one specific copy cell group.
8 is a diagram for explaining a wireless network design and optimization system according to the present invention.

Hereinafter, the embodiments disclosed in the present specification will be described in detail with reference to the accompanying drawings, but the same or similar components are assigned the same reference numbers regardless of reference numerals, and redundant description thereof will be omitted. The suffixes "module" and "part" for components used in the following description are given or mixed in consideration of only the ease of writing the specification, and do not have distinct meanings or roles by themselves. In addition, in describing the embodiments disclosed in the present specification, if it is determined that detailed descriptions of related known technologies may obscure the gist of the embodiments disclosed in this specification, the detailed description thereof will be omitted. In addition, the accompanying drawings are only for easy understanding of the embodiments disclosed in the present specification, and the technical idea disclosed herein is not limited by the accompanying drawings, and all changes included in the spirit and scope of the present invention , should be understood to include equivalents or substitutes.

Terms including an ordinal number such as 1st, 2nd, etc. may be used to describe various elements, but the elements are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

When an element is referred to as being “connected” or “connected” to another element, it is understood that it may be directly connected or connected to the other element, but other elements may exist in between. it should be On the other hand, when it is said that a certain element is "directly connected" or "directly connected" to another element, it should be understood that the other element does not exist in the middle.

The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as “comprises” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

In implementing the present invention, components may be subdivided for convenience of description, but these components may be implemented in one device or module, or one component may be divided into a plurality of devices or modules. It can also be implemented in

A mobile communication system in the present specification refers to a system for providing various communication services such as voice and data packets using radio resources, and may include a terminal, a base station, or a core network.

The present embodiments disclosed below may be applied to a mobile communication system using various radio access technologies. For example, the present embodiments are CDMA (code division multiple access), FDMA (frequency division multiple access), TDMA (time division multiple access), OFDMA (orthogonal frequency division multiple access), SC-FDMA (single carrier frequency division multiple access) Alternatively, it may be applied to various radio access technologies such as non-orthogonal multiple access (NOMA). In addition, the wireless access technology may mean not only a specific access technology, but also a communication technology for each generation established by various communication consultation organizations such as 3GPP, 3GPP2, WiFi, Bluetooth, IEEE, and ITU. For example, CDMA may be implemented with a radio technology such as universal terrestrial radio access (UTRA) or CDMA2000. TDMA may be implemented with a radio technology such as global system for mobile communications (GSM)/general packet radio service (GPRS)/enhanced datarates for GSM evolution (EDGE). OFDMA may be implemented with a radio technology such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and evolved UTRA (E-UTRA). IEEE 802.16m is an evolution of IEEE 802.16e, and provides backward compatibility with a system based on IEEE 802.16e. UTRA is part of the universal mobile telecommunications system (UMTS). 3rd generation partnership project (3GPP) long term evolution (LTE) is a part of evolved UMTS (E-UMTS) that uses evolved-UMTSterrestrial radio access (E-UTRA), and employs OFDMA in the downlink and SC- FDMA is employed. As such, the present embodiments may be applied to currently disclosed or commercialized radio access technologies, or may be applied to radio access technologies currently under development or to be developed in the future.

On the other hand, the terminal in the present specification is a comprehensive concept meaning a device including a wireless communication module that performs communication with a base station in a wireless communication system, WCDMA, LTE, NR, HSPA and IMT-2020 (5G or New Radio), etc. It should be interpreted as a concept including all of UE (User Equipment), MS (Mobile Station), UT (User Terminal), SS (Subscriber Station), wireless device, etc. in GSM. In addition, the terminal may be a user's portable device such as a smart phone depending on the type of use, and in a V2X communication system may mean a vehicle, a device including a wireless communication module in the vehicle, and the like. In addition, in the case of a machine type communication (Machine Type Communication) system, it may mean an MTC terminal, an M2M terminal, a URLLC terminal, etc. equipped with a communication module to perform machine type communication.

A base station or cell of the present specification refers to an end that communicates with a terminal in terms of a network, a Node-B (Node-B), an evolved Node-B (eNB), gNode-B (gNB), a Low Power Node (LPN), Sector, site, various types of antennas, base transceiver system (BTS), access point, point (eg, transmission point, reception point, transmission/reception point), relay node ), mega cell, macro cell, micro cell, pico cell, femto cell, RRH (Remote Radio Head), RU (Radio Unit), small cell (small cell), such as a variety of coverage areas. In addition, the cell may mean including a BWP (Bandwidth Part) in the frequency domain. For example, the serving cell may mean the Activation BWP of the UE.

In the various cells listed above, since there is a base station controlling one or more cells, the base station can be interpreted in two meanings. 1) in relation to the radio area, it may be the device itself providing a mega cell, a macro cell, a micro cell, a pico cell, a femto cell, or a small cell, or 2) may indicate the radio area itself. In 1), the devices providing a predetermined radio area are controlled by the same entity, or all devices interacting to form a radio area cooperatively are directed to the base station. A point, a transmission/reception point, a transmission point, a reception point, etc. become an embodiment of a base station according to a configuration method of a wireless area. In 2), the radio area itself in which signals are received or transmitted from the point of view of the user terminal or the neighboring base station may be indicated to the base station.

In the present specification, a cell is a component carrier having a coverage of a signal transmitted from a transmission/reception point or a coverage of a signal transmitted from a transmission/reception point (transmission point or transmission/reception point), and the transmission/reception point itself. can

Hereinafter, the present invention will be described with respect to a 5G wireless communication system. However, the scope of the present invention is not limited to the 5G wireless communication system, and may be applied to any wireless communication system capable of operating a copy cell, such as LTE.

1 is a view for explaining a copy cell grouping apparatus according to the present invention.

The copy cell grouping apparatus 100 may include an input unit 110 , a control unit 120 , an output unit 130 , and a memory 140 .

The input unit 110 may include a communication unit. In this case, the communication unit 110 may support wired or wireless communication between the copy cell grouping apparatus 100 and an external device.

Specifically, the communication unit may provide an interface for connecting the copy cell grouping apparatus 100 to a wired/wireless network including an Internet network. The copy cell grouping apparatus 100 may transmit or receive data with the photographing apparatus (not shown) and the broadcast output apparatus 200 through the connected network or another network linked to the connected network.

In addition, the communication unit may receive data necessary for the operation or operation of the present invention from an external device. For example, the communication unit may receive data on the received signal strength from a measuring device that has measured the received signal strength.

Also, the input unit 110 may include a data input unit. In this case, the data input unit may receive data necessary for the operation or operation of the present invention from the user.

Also, the input unit 110 may include a user input unit. In this case, the user input unit may receive an input necessary for the operation from the user.

The controller 120 may control the overall operation of the copy cell grouping apparatus 100 . Also, the controller 120 may perform an operation for performing the copy cell grouping method.

The output unit 130 is for providing a user interface, and may include a display unit or a speaker unit. In this case, the output unit 130 may display various GUIs, grouping results, or the like, or output the sound.

Also, the control unit 120 may transmit the grouping result to the DUs connected to the RUs in the copy cell group derivation area through the communication unit. In this case, the controller 120 may directly transmit the grouping result to the DU, or may transmit the grouping result through a separate operation server.

In this case, the DU may set one RU in one copy cell group as a master cell and one or more other RUs in the one copy cell group as a copy cell. In this case, one RU may operate as a master cell to transmit an independent signal, and one or more other RUs may operate as a copy cell to copy and transmit the same signal as the master cell in the same group.

The memory 140 may store programs, contents, signal-processed images, audio or data signals, etc. for each signal processing and control in the controller 120 .

In addition, the memory 140 may store an application program or data for an operation or operation of the copy cell grouping apparatus 100 .

2 is a flowchart illustrating a copy cell grouping method for reducing interference in a wireless communication system according to the present invention.

A copy cell grouping method for reducing interference in a wireless communication system according to the present invention includes: obtaining received signal strengths between a plurality of RUs in a copycell group derivation area and a plurality of reception areas (S210), based on the received signal strength Thus, selecting an RU to be a communication target of each of the plurality of reception areas from among the plurality of RUs (S230), obtaining a weighted interference amount between the plurality of RUs by performing acquisition of a weighted interference amount for the plurality of RUs The method may include step S250 and grouping the copy cell groups based on the weighted interference amount between the plurality of copy cell groups including the plurality of RUs ( S270 ).

First, a step ( S210 ) of obtaining received signal strengths between a plurality of RUs in a copy cell group derivation area and a plurality of reception areas will be described.

A copy cell grouping system (hereinafter referred to as a “copy cell grouping system”) for reducing interference in a wireless communication system may acquire received signal strengths between a plurality of RUs in a copy cell group derivation area and a plurality of reception areas.

Here, the copy cell group derivation area may be an area designated by a user. In this case, the copy cell group derivation area may be an area set by the user on the map or an administrative area set by the user. In this case, the control unit 120 may receive an input for setting the copy cell group derivation area through the input unit 110 .

Meanwhile, the copy cell group derivation area may include a plurality of RUs and a plurality of reception areas.

A plurality of RUs may be disposed to be spaced apart from each other in the copy cell group derivation area.

The reception area may mean a specific point (reception point) at which signal strength is measured, and may mean an area including a specific point at which signal strength is measured (eg, a specific point and an area surrounding the specific point). may be

The copy cell group derivation area may be divided by a virtual grid. In this case, the reception area may be an intersection within the grid, an area including the intersection within the grid, or an area divided by the grid.

Meanwhile, the controller 120 may acquire received signal strengths between the plurality of RUs in the copy cell group derivation area and the plurality of reception areas.

Here, acquiring the received signal strength between the plurality of RUs and the plurality of reception areas may mean acquiring the reception signal strength between each of the plurality of RUs and the plurality of reception areas.

For example, when a plurality of RUs are configured with a first RU and a second RU, and the plurality of reception areas are configured with a first reception area, a second reception area, and a third reception area, the control unit 120 is configured to receive the first reception area. Receiving signal strength between the area and the first RU, the reception signal strength between the first reception area and the second RU, the reception signal strength between the second reception area and the first RU, the reception signal strength between the second reception area and the second RU, the second The received signal strength between the 3 reception area and the first RU and the reception signal strength between the third reception area and the second RU may be obtained.

Meanwhile, the meaning of acquiring the received signal strength of the reception area may include acquiring the reception signal strength at a point (eg, the center of the reception area) within the reception area.

As a method of obtaining the received signal strength between the plurality of RUs and the plurality of reception areas, the controller 120 may estimate the strength of the reception signal for each of the plurality of reception areas by using a propagation model.

In this case, the controller 120 may estimate the strength of the received signal after setting the prediction radius and the prediction resolution.

The reason for setting the prediction radius is to shorten the calculation time. In detail, since a reception area far from the RU has a weak strength of a reception signal, such a reception area does not significantly affect the copy cell grouping calculation. Therefore, unnecessary calculations can be reduced by setting the prediction radius.

Meanwhile, the prediction radius may be determined according to the characteristics of the surrounding area in which the RU is disposed. For example, in the case of a base station installed in a city center, a predicted radius of 500 m is usually sufficient. However, in the case of an RU installed in a high position such as on the roof of an apartment building, a prediction radius of about 1000 m is sometimes required.

Meanwhile, the prediction resolution may vary depending on the accuracy of the propagation model or the allowable computation time. For example, when using an accurate propagation model such as a 3D ray tracing model, if the resolution is set to about 2m, the propagation of radio waves can be observed along a narrow gap between buildings or a back road.

As another method of obtaining the received signal strength between the plurality of RUs and the plurality of reception areas, the signal measuring apparatus may measure the strength of all signals received at the location of the reception area. Here, the signal measuring device may include a scanner or a terminal DM (Diagnostic Monitoring).

In this case, the control unit 120 may receive data measured by the signal measuring device through the input unit 110 .

Hereinafter, for convenience of explanation, the received signal strength will be described based on the prediction result using the propagation model, but the present invention is not limited thereto.

3 is a result of predicting a synchronization signal reference signal received power (SS-RSRP), which is a received signal strength of a synchronization signal, which is a control signal of 5G, in a plurality of reception areas.

Synchronization Signal Reference Signal Received Power (SS-RSRP) may be used as the received signal strength.

Specifically, the amount of interference between RUs varies depending on the control signal and the amount of user traffic. However, the amount of user traffic varies with time, and if it is assumed that the amount of user traffic is the same for each RU, when the amount of SS-RSRP interference increases, the interference by user traffic also increases in proportion to it.

Therefore, the copy cell grouping system may use SS-RSRP with time invariance as the received signal strength.

SS-RSRP is strong near the transmitting RU, but is attenuated and weakened as the distance from the RU increases.

Meanwhile, referring to FIG. 3A , it can be seen that the received signal strength (eg, SS-RSRP) is attenuated and weakened as the distance from the RU increases. In addition, the received signal strength (eg, SS-RSRP) as well as the distance may be attenuated due to scattering by terrain, diffraction by buildings, reflection, and scattering by street trees.

The controller 120 may select an RU to be a communication target of each of the plurality of reception areas from among the plurality of RUs based on the received signal strength (S230).

Here, the meaning of selecting an RU to be a communication target in the reception area may mean selecting an RU that has transmitted a signal of the greatest strength among signals received in the corresponding reception area.

For example, a first signal from a first RU, a second signal from a second RU, and a third signal from a third RU are received in the first reception area, and the strength of the signal measured in the first reception area is the first In the case of the largest signal, the first RU may be selected as a communication target RU of the first reception area. In this case, the first RU may be called a serving cell for the first reception area.

On the other hand, when a communication target RU of each of the plurality of reception areas is selected, the plurality of reception areas may be divided into reception areas having the same RU as a communication target.

For example, in FIG. 3A , it is assumed that two RUs exist for convenience of description. In this case, the reception areas on the left with respect to the line 310 may have the first RU (RU1) as a communication target (serving cell), and the reception areas on the right side with respect to the line 310 may have the second RU ( RU2) as a communication target (serving cell).

Here, a set of reception areas having the first RU(RU1) as a communication target (serving cell), that is, a set of areas communicating with the first RU(RU1) may be referred to as a communication area of the first RU(RU1).

In addition, a set of reception areas having the second RU (RU2) as a communication target (serving cell), that is, a set of areas communicating with the second RU (RU2) may be referred to as a communication area of the second RU (RU2).

Meanwhile, FIG. 3B is a schematic representation of the intensity of a signal transmitted from the first RU (RU1).

Referring to FIG. 3B , the reception areas on the left with respect to the line 310 may communicate with the first RU (RU1). Accordingly, the signal transmitted from the first RU (RU1) may act as a communication signal for the reception areas on the left with respect to the line 310 .

However, the reception areas on the right side with respect to the line 310 communicate with the second RU (RU2). Therefore, when the first RU (RU1) and the second RU (RU2) do not belong to the same copy cell group, or when both the first RU (RU1) and the second RU (RU2) operate as master cells, the first RU (RU1) ) may act as interference for the reception areas on the right with respect to the line 310 .

3c is a diagrammatic representation of the intensity of a signal transmitted from the second RU (RU2).

Referring to FIG. 3C , the reception areas on the right side with respect to the line 310 may communicate with the second RU (RU2). Accordingly, the signal transmitted from the second RU (RU2) may act as a communication signal for the reception areas on the right side with respect to the line 310 .

However, the reception areas on the left with respect to the line 310 communicate with the first RU (RU1). Therefore, when the first RU (RU1) and the second RU (RU2) do not belong to the same copy cell group, or when both the first RU (RU1) and the second RU (RU2) operate as master cells, the second RU (RU2) ) may act as interference for reception areas on the left with respect to the line 310 .

Meanwhile, when the first RU (RU1) and the second RU (RU2) belong to one copy cell group, and one RU operates as a master cell and the other RU operates as a copy cell, interference does not occur between the two RUs.

Accordingly, when RUs having large interference are grouped and operated as one copy cell group, interference between RUs can be reduced, and thus the quality of wireless communication can be improved.

Therefore, in the present invention, the amount of interference between RUs can be obtained and a plurality of RUs can be grouped based on the amount of interference between RUs.

In this case, the controller 120 may use the weighted interference amount as a criterion for grouping.

Specifically, the controller 120 may acquire the weighted interference amount between the plurality of RUs by performing the acquisition of the weighted interference amount for the plurality of RUs (S250).

The amount of interference indicates the degree of interference between a plurality of RUs. In addition, the weighted interference amount reflects the characteristic of the reception area as a weight to the degree of interference between a plurality of RUs.

Accordingly, the amount of interference by other RUs and a region weight indicating the characteristics of the reception region may be reflected in the weighted interference amount.

The reason for using the weighted interference amount is to preferentially secure high radio quality in a reception area requiring high radio quality compared to a reception area requiring low radio quality.

Accordingly, a higher value of the area weight may be assigned to a reception area requiring high radio quality compared to a reception area requiring low radio quality.

4 is a diagram illustrating a region weight assigned according to the characteristics of a reception region.

Referring to FIG. 4 , the intersections 410 and 420 or the roundabout 430 where main roads meet are places with a lot of vehicle traffic, and relatively high wireless quality is obtained from the main road 440 . is required

Also, in the same principle, a relatively higher radio quality is required on the main road 440 than on the back road 450 .

In addition, the back road 450 is a place used by many people, and a relatively high wireless quality is required compared to the non-road 460 .

Accordingly, as for the area weight, a higher value may be assigned to the reception area located on the back road 450 compared to the reception area located on the non-road 460 . Also, as for the area weight, a higher value may be assigned to the reception area located on the main road 440 compared to the reception area located on the back road 450 .

In addition, the area weight may be assigned a higher value to the reception area located at the 'intersections 410 and 420 or the roundabout 430 where the main roads meet' compared to the reception area located at the main road 440 .

For example, a weight of 10 may be assigned to the intersections 410 and 420 or the roundabout 430 where the main roads meet, a weight of 5 may be assigned to the main road 440, a weight of 3 may be assigned to the back road, and a weight of 0 may be assigned to a non-road.

Also, in densely populated areas, relatively high wireless quality is required compared to sparsely populated areas. Accordingly, a higher value of the area weight may be assigned to a reception area located in a densely populated area compared to a reception area located in a sparsely populated area.

Meanwhile, the controller 120 may calculate a weighted interference amount by reflecting the interference amount and the area weight by other RUs in reception areas having the same RU as a communication target (having the same serving cell).

Here, it is assumed that the same RU is the first RU. It is also assumed that the weighted interference amount by the second RU among other RUs is calculated.

In this case, the copy cell grouping system may calculate the weighted interference amount reflecting the interference amount and the area weight by the second RU in the reception areas having the first RU as the communication target (the first RU as the serving cell).

This can be expressed by the following formula.

Here, the communication area of the first RU may include an area having the first RU (RU1) as a communication target (serving cell). That is, the communication area of the first RU may include a plurality of reception areas having the first RU as a serving cell.

In this case, the controller 120 may acquire a weighted interference amount in which the interference by the second RU and the area weight are reflected in the reception areas having the first RU as a communication target (serving cell). The weighted interference amount obtained in this way may be referred to as a weighted interference amount by the second RU in the communication area of the first RU.

Specifically, the control unit 120 performs the product of the signal strength of the second RU and the area weight for the reception areas having the first RU as a communication target and then sums them up, thereby the weighted interference amount by the second RU in the communication area of the first RU. can be obtained.

More specifically, it is assumed that the first reception area and the second reception area exist in the reception areas having the first RU as a communication target. In this case, the copy cell grouping system may obtain a product (a first value) of a signal strength of the second RU received in the first reception area and a weight assigned to the first reception area. Also, the copycell grouping system may obtain a product (second value) of a signal strength of the second RU received in the second reception area and a weight assigned to the second reception area. Then, the copycell grouping system may acquire the weighted interference amount by the second RU in the communication area of the first RU by summing the first value and the second value.

In the following, it is assumed that the same RU is the first RU, and it is assumed that the weighted interference amount by the third RU among other RUs in the copycell group derivation area is calculated.

In this case, the copy cell grouping system may calculate the weighted interference amount reflecting the interference amount and the area weight by the third RU in the reception areas having the first RU as the communication target (the first RU as the serving cell).

In this case, the communication area of the first RU may include a plurality of reception areas having the first RU as a serving cell.

In addition, the copy cell grouping system may obtain a weighted interference amount in which the interference by the third RU and the area weight are reflected in the reception areas having the first RU as a communication target (serving cell). The weighted interference amount obtained in this way may be referred to as a weighted interference amount by the third RU in the communication area of the first RU.

Specifically, the control unit 120 performs the product of the signal strength of the third RU and the area weight for the reception areas having the first RU as a communication target, and then sums them up, thereby the weighted interference amount by the third RU in the communication area of the first RU. can be obtained.

More specifically, it is assumed that the first reception area and the second reception area exist in the reception areas having the first RU as a communication target. In this case, the controller 120 may obtain the product (third value) of the signal strength of the third RU received in the first reception area and the weight assigned to the first reception area. Also, the controller 120 may obtain a product (a fourth value) of a signal strength of the third RU received in the second reception area and a weight assigned to the second reception area. Then, the copycell grouping system may acquire the weighted interference amount by the third RU in the communication area of the first RU by summing the third value and the fourth value.

Meanwhile, the same RU is assumed as the first RU, and a weighted interference amount by other RUs in the communication area of the first RU is obtained. And this process may be performed for other RUs as well.

For example, if there are three RUs in the copycell group derivation area, the copycell grouping system calculates the weighted interference amount by the second RU in the communication area of the first RU and the weighted by the third RU in the communication area of the first RU. the amount of interference, the weighted amount of interference by the first RU in the communication area of the second RU, the weighted amount of interference by the third RU in the communication area of the second RU, the weighted amount of interference by the first RU in the communication area of the third RU, the third RU It is possible to calculate the amount of weighted interference by the second RU in the communication area of .

5 is an example in which the weighted interference calculated by the above method is configured in a matrix.

Referring to FIG. 5 , it can be seen that the weighted interference amount by the second RU (interfering cell) is 10 in the communication area of the first RU (a plurality of reception areas having the first RU as a serving cell).

Also, referring to FIG. 5 , it can be seen that the weighted interference amount by the first RU (interfering cell) is 15 in the communication area of the second RU (a plurality of reception areas having the second RU as a serving cell).

Also, referring to FIG. 5 , it can be seen that the weighted interference amount by the second RU (interfering cell) is 30 in the communication area of the N-th RU (a plurality of reception areas having the N-th RU as a serving cell).

Meanwhile, the control unit 120 may group the copy cell groups based on the weighted interference amount between the plurality of copy cell groups including the plurality of RUs ( S270 ).

In more detail, the controller 120 may group copy cell groups with the greatest amount of weighted interference into one copy cell group based on the weighted interference amount between the plurality of copy cell groups including the plurality of RUs.

This will be described in detail with reference to FIG. 6 .

6 is a flowchart illustrating a method of grouping copy cell groups.

A method of grouping copycell groups having the greatest mutually weighted interference into one copycell group includes: grouping a plurality of RUs into a plurality of copycell groups each having one element (S610), a plurality of copycell groups If the weighted interference amount between the first copy cell group and the second copy cell group is the greatest, grouping the first copy cell group and the second copy cell group into one specific copy cell group (S620), 'Multiple copies For groups other than the first copy cell group and the second copy cell group among the cell groups, and for a specific copy cell group, copy cell groups having the largest amount of weighted interference with each other are copied based on the weighted interference amount between the groups. Grouping into a cell group (S630), repeating the grouping (S640), stopping grouping on the copy cell group having the maximum number of elements and performing grouping on the remaining copy cell groups (S650), When additional grouping is impossible, the step of terminating grouping (S660) may be included.

The controller 120 may group the plurality of RUs into a plurality of copy cell groups each having one element. Therefore, in the initial step, the number of RUs in the copy cell group derivation area may be equal to the number of copy cell groups.

For example, a first copycell group may have a first RU as an element, a second copycell group may have a second RU as an element, and an Nth copycell group may have an Nth RU as an element.

In this case, the entire copy cell group is [{1}, {2}, … , {N-1}, {N}].

Hereinafter, the table of FIG. 5 will be described as the weighted interference amount between copy cell groups.

The following describes the initial grouping.

[First grouping]

When the amount of weighted interference between the first copy cell group and the second copy cell group is the greatest among the plurality of copy cell groups, the controller 120 sets the first copy cell group and the second copy cell group as one specific copy cell group. can be grouped by (S620).

In more detail, the controller 120 may obtain a weighted interference amount between two copy cell groups among a plurality of copy cell groups.

Here, the weighted interference amount between the two copy cell groups may be the sum of the weighted interference amounts by the other copy cell group in the communication area of one copy cell group among the two copy cell groups.

For example, when the control unit 120 selects the third copy cell group and the fourth copy cell group, the weighted interference amount between the third copy cell group and the fourth copy cell group is 'to the fourth copy cell group in the communication area of the third copy cell group. It may be the sum of the 'weighted interference amount by the third copy cell group' and the 'weighted interference amount by the third copy cell group in the communication area of the fourth copy cell group'.

Also, the communication area of the third copy cell group may mean a communication area of one or more RUs included in the third copy cell group. For example, when the third copy cell group has a fifth RU and an eighth RU as elements, the communication area of the third copy cell group may be a combined area of the communication area of the fifth RU and the communication area of the eighth RU.

Also, the weighted interference amount by the fourth copy cell group in the communication area of the third copy cell group may mean the weighted interference amount by one or more RUs included in the fourth copy cell group. For example, when the fourth copy cell group includes the second RU and the seventh RU as elements, interference by the fourth copy cell group may mean interference by the second RU and the seventh RU.

In addition, the controller 120 may select two copy cell groups to obtain mutually weighted interference with respect to all copy cell groups. In this case, mutually weighted interference may be obtained for all copy cell groups.

And, when the weighted interference amount between the first and second copy cell groups among the plurality of copy cell groups is the greatest, the controller 120 sets the first copy cell group and the second copy cell group as one specific copy cell group. can be grouped by

For example, referring to FIG. 5 , the interference of the N-th copy cell group with respect to the communication area of the second copy cell group is 15, and the interference of the second copy cell group with the communication area of the N-th copy cell group is 30. Accordingly, since the weighted interference 45 between the second copy cell group and the N-th copy cell group is the largest, the controller 120 may group the second copy cell group and the N-th copy cell group into a specific copy cell group.

For convenience of description, it will be described that the N-th copy cell group is merged with the second copy cell group. Accordingly, the specific copy cell group described above may be the second copy cell group.

And when the N-th copy cell group is merged into the second copy cell group, the second copy cell group may have the second RU and the N-th RU as elements.

In this case, the entire copy cell group is [{1}, {2, N}, {3}, ... , {N-1}].

7 is a diagram illustrating a result of grouping a first copy cell group and a second copy cell group into one specific copy cell group.

When the second RU and the N-th RU are merged into the second copy cell group, mutual interference between the second RU and the N-th RU may be zero. In FIG. 7 , mutual interference between the second RU and the Nth RU is indicated by ×.

Meanwhile, the copy cell grouping system may acquire a weighted interference amount between a specific copy cell group (the second copy cell group) and the remaining copy cell groups.

Here, the remaining copy cell groups include a first copy cell group (second copy cell group) and a second copy cell group (N-th copy cell group) among a plurality of copy cell groups (the first copy cell group to the N-th copy cell group). It may mean the remaining copy cell groups except for.

In this case, the controller 120 controls the 'weighted interference amount between the first copy cell group (the second copy cell group) and the remaining copy cell groups' and 'the second copy cell group (the Nth copy cell group) and the remaining copy cell groups. By summing the 'weighted interference amount between ', the weighted interference amount between a specific copy cell group (the second copy cell group) and the remaining copy cell groups may be obtained.

First, a process of calculating the amount of weighted interference between a specific copy cell group (the second copy cell group) and the first copy cell group among the remaining copy cell groups will be described.

For example, referring again to FIG. 5 , the interference of the first copycell group with respect to the second copycell group is 15, and the interference of the second copycell group with respect to the first copycell group is 10. FIG. Therefore, the interference between the first copy cell group and the second copy cell group before grouping was 25.

Referring back to FIG. 5 , the interference of the first copycell group with respect to the Nth copycell group is 15, and the interference of the first copycell group with respect to the Nth copycell group is 20. As shown in FIG. Therefore, the interference between the first copy cell group and the Nth copy cell group before grouping was 35.

Then, the control unit 120 adds the 'weighted amount of interference between the second copy cell group and the first copy cell group' and the 'weighted amount of interference between the Nth copy cell group and the first copy cell group' by summing the specific copy cell group (second copy cell). group) and the weighted interference amount between the first copy cell groups may be obtained.

For example, the weighted interference amount between a specific copy cell group (the second copy cell group) and the first copy cell group may be 60 (25+35).

To explain the above process in more detail, the weighted interference amount of the first copy cell group 30 (refer to FIG. 7 ) with respect to a specific copy cell group (a new second copy cell group having the second RU and the N-th RU as elements) is, The weighted interference amount of the first copycell group (15, see FIG. 5) with respect to the existing second copycell group (having the second RU as an element) and the existing Nth copycell group (having the Nth RU as an element) for It may be the sum of the weighted interference amounts (15, see FIG. 5 ) of the first copy cell group.

Also, the weighted interference amount 30 (refer to FIG. 7 ) of a specific copycell group (a new second copycell group having the second RU and the Nth RU as elements) with respect to the first copycell group, The weighted interference amount (10, see FIG. 5) of the copycell group (having the second RU as an element) and the weighted interference amount (20) of the existing Nth copycell group (having the Nth RU as an element) to the first copycell group , see FIG. 5).

Accordingly, the weighted interference amount between the specific copy cell group (the second copy cell group) and the first copy cell group may be 60 (30+30).

The following describes a process of calculating an amount of weighted interference between a specific copy cell group (a new second copy cell group) and an N-1 th copy cell group among the remaining copy cell groups.

Referring back to FIG. 5 , the interference of the N-1 th copy cell group with respect to the second copy cell group is 10, and the interference of the second copy cell group with respect to the N-1 th copy cell group is 15. Therefore, the interference between the N-1 th copy cell group and the second copy cell group before grouping was 25.

Referring back to FIG. 5 , the interference of the N-1 th copy cell group with respect to the N th copy cell group is 15, and the interference of the N th copy cell group with respect to the N-1 th copy cell group is 25 . Therefore, the interference between the N-1 th copy cell group and the N th copy cell group before grouping was 40.

In this case, the weighted interference amount between the specific copy cell group (new second copy cell group) and the N-1 th copy cell group may be 65 (25+40).

The above process will be described more specifically, the weighted interference amount of the N-1 th copy cell group with respect to a specific copy cell group (the second copy cell group having the 2 nd RU and the N th RU as elements) (refer to 25 and 7 6 ) ) is the weighted interference amount (10, see FIG. 5) of the N-1 th copy cell group with respect to the existing second copy cell group (having the second RU as an element) and the existing N th copy cell group (with the N RU as an element) It may be the sum of the weighted interference amount 15 (refer to FIG. 5 ) of the N-1 th copy cell group with respect to (as an element).

In addition, the weighted interference amount (40, see FIG. 7 ) of a specific copy cell group (a new second copy cell group having the second RU and the N RU as elements) with respect to the N-1 th copy cell group is the N-1 th copy cell The weighted interference amount (15, see FIG. 5) of the existing second copycell group (having the second RU as an element) for the group and the existing Nth copycell group (having the Nth RU as an element) for the N-1th copycell group It may be the sum of weighted interference amounts (25, see FIG. 5 ) of the elements).

Accordingly, the weighted interference amount between the specific copy cell group (the second copy cell group) and the N-1 th copy cell group may be 65 (25+40).

The initial grouping has been described above. Next, the second grouping will be described.

[Second grouping]

When the weighted interference amount between a specific copy cell group and other copy cell groups is obtained, the copy cell grouping system may further group the currently existing copy cell groups.

The currently existing copy cell group is a first copy cell group to an N-1 th copy cell group. In this case, the currently existing copy cell group is [{1}, {2, N}, {3}, ... , {N-1}].

In this case, the control unit 120 controls 'groups other than the first copy cell group and the second copy cell group among the plurality of copy cell groups' and the specific copy cell group, based on the weighted interference amount between the groups. Copy cell groups having the largest amount of weighted interference may be grouped into one copy cell group (S630).

That is, the copy cell grouping system currently selects the remaining copy cell groups [{1}, {2, N}, {3}, ... , {N-1}], the second grouping may be performed.

For example, the controller 120 may control 'groups other than the first copy cell group (the existing second copy cell group) and the second copy cell group (the N-th copy cell group) among the plurality of copy cell groups' and a specific copy cell group. For a cell group (a new second copy cell group), a second grouping may be performed.

The grouping method may be performed in the same manner as the first grouping method.

Meanwhile, the copy cell grouping system may repeatedly perform such grouping (S640). Accordingly, the process of grouping the two copy cell groups having the largest amount of mutually weighted interference into one copy cell group may be repeatedly performed.

In this case, the controller 120 may repeatedly perform grouping under a certain condition.

Here, the predetermined condition is that the maximum number of elements in the copy cell group is preset. And this maximum number may be determined according to the characteristics of the operating equipment or the operating policy of the operator.

Hereinafter, it is assumed that the operator's operation policy operates by grouping three RUs into one copy cell group. In this case, the maximum number of elements in the copy cell group may be three.

Therefore, grouping should not be performed so that the number of elements in the copy cell group exceeds the maximum number (3).

Therefore, if the maximum number of elements is exceeded when the copy cell groups having the greatest mutually weighted interference are grouped, the controller 120 may group the copy cell groups of different combinations.

For example, it is assumed that a first copycell group includes a first RU and a third RU, and a second copycell group includes a fifth RU and a seventh RU. In this case, even if the mutual interference between the first copy cell group and the second copy cell group is the greatest, when the first and second copy cell groups are grouped, the number of elements becomes 4, so the first copy cell group and the second copy cell group cannot be grouped.

In this case, the controller 120 may group copy cell groups of different combinations.

For example, the copy cell grouping system may group two copy cell groups having the second highest mutual interference between groups. In addition, if the number of elements exceeds the maximum number when two copy cell groups with the second highest mutual interference are grouped, the copy cell grouping system can group the two copy cell groups with the third highest mutual interference between groups. .

Meanwhile, the controller 120 may stop grouping on the copy cell group having the maximum number of elements and perform grouping on the remaining copy cell groups ( S650 ).

For example, if the second copy cell group has three elements (eg, 2 RU, 7 RU, N RU) as grouping is repeated, the second copy cell group should not be grouped any more.

Accordingly, the controller 120 may stop grouping for the second copy cell group. Here, the cessation of grouping for the second copy cell group may mean that the second copy cell group is no longer merged with another copy cell group.

To stop grouping of the second copy cell group, the controller 120 may set the weighted interference amount between the copy cell group having the maximum number of elements and other copy cell groups to zero.

For example, the controller 120 may set the weighted interference amount between the second copy cell group having the maximum number of elements and the first copy cell group to zero. Also, in the same way, the controller 120 may set the weighted interference amount between the second copy cell group having the maximum number of elements and another group to zero.

In this way, the controller 120 may stop grouping the copy cell groups having the maximum number of elements. For example, when the second copy cell group, the fourth copy cell group, and the seventh copy cell group have the maximum number of elements, the control unit 120 may perform grouping by using the remaining copy cell groups except for them.

After the grouping continues in this way, the controller 120 may end the grouping if there are no more copy cell groups to be merged (S670).

On the other hand, when the grouping is completed by repeating the step of grouping the copy cell groups with the largest amount of mutually weighted interference into one copy cell group, the grouped copy cell groups (copy cell groups having the maximum number of elements) exist. do.

In this case, one RU in the grouped copy cell group may operate as a master cell, and another RU in the grouped group may operate as a copy cell.

In this case, one RU in one copy cell group may operate as a master cell to transmit an independent signal, and another RU may operate as a copy cell to copy and transmit the same signal as the master cell in the same group.

8 is a diagram for explaining a wireless network design and optimization system according to the present invention.

The copy cell grouping method described above may be used in a wireless network design and optimization system.

In addition, the copy cell grouping method may be applied to a system for designing and optimizing a wireless network, and may be used when deriving an optimal copy cell operation plan for base stations within a user-specified area.

The wireless network design and optimization system obtains base station and antenna information, topographic elevation and building map, and radio quality measurement data, and obtains base station coverage and interference analysis, automatic optimization, coverage rate statistical analysis of the target area, and coverage map generation. , calculation of the optimal antenna position, direction, tilt, etc. may be performed. And the copy cell grouping method can be applied together to a wireless network design and optimization system that performs the above functions.

As such, the present invention can improve the quality of a wireless network by deriving an optimal copy cell group that minimizes interference when operating an LTE/5G base station. Accordingly, the user may be provided with improved signal quality and throughput.

In addition, according to the present invention, interference mitigation is possible in an urban area with severe interference, and there is an advantage in that frequent handovers can be prevented in a situation in which the terminal moves at high speed, such as in the LTE-R system.

In addition, in the present invention, grouping is performed in consideration of not only interference between RUs but also characteristics of a reception area by using a weighted interference amount. Accordingly, there is an advantage in that an improved service can be preferentially provided to a reception area requiring higher radio quality.

The present invention described above can be implemented as computer-readable codes on a medium in which a program is recorded. The computer-readable medium includes all types of recording devices in which data readable by a computer system is stored. Examples of computer-readable media include Hard Disk Drive (HDD), Solid State Disk (SSD), Silicon Disk Drive (SDD), ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage device, etc. There is this. In addition, the computer may include a control unit. Accordingly, the above detailed description should not be construed as restrictive in all respects but as exemplary. The scope of the present invention should be determined by a reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the present invention are included in the scope of the present invention.

110: input unit 120: control unit
130: output unit 140: memory

Claims (20)

obtaining received signal strengths between a plurality of RUs in a copycell group derivation area and a plurality of reception areas;
selecting an RU to be a communication target of each of the plurality of reception areas from among the plurality of RUs based on the received signal strength;
acquiring a weighted interference amount between the plurality of RUs by performing acquisition of a weighted interference amount for the plurality of RUs; and
grouping the copy cell groups based on the weighted interference amount between the plurality of copy cell groups composed of the plurality of RUs;
Acquiring the weighted interference amount between the plurality of RUs by performing the acquisition of the weighted interference amount for the plurality of RUs includes:
Obtaining a weighted interference amount reflecting the interference amount by other RUs and the area weight in the reception areas having the same RU as a communication target;
A copy cell grouping method for reducing interference in a wireless communication system. The method of claim 1,
The area weight is
A higher value is assigned to a reception area requiring high radio quality compared to a reception area requiring low radio quality.
A copy cell grouping method for reducing interference in a wireless communication system. 3. The method of claim 2,
The area weight is
Higher values are assigned to receive areas located in densely populated areas compared to those located in sparsely populated areas.
A copy cell grouping method for reducing interference in a wireless communication system. The method of claim 1,
The area weight is
A higher value is assigned to the receiving area located on the main road compared to the receiving area located on the back road,
Compared to the reception area located on the main road, a higher value is assigned to the reception area located at the intersection or roundabout where the main roads meet.
A copy cell grouping method for reducing interference in a wireless communication system. The method of claim 1,
The step of obtaining a weighted interference amount reflecting interference by other RUs and an area weight in reception areas having the same RU as a communication target includes:
The weighted interference amount by the first RU in the communication area of the same RU by performing the product of the signal strength and the area weight of the first RU among the other RUs for the reception areas having the same RU as a communication target and then summing them obtaining a; and
The weighted interference amount by the second RU in the communication area of the same RU by performing the product of the signal strength and the area weight of the second RU among the other RUs for the reception areas having the same RU as the communication target and then summing them obtaining; including
A copy cell grouping method for reducing interference in a wireless communication system. 6. The method of claim 5,
The step of performing the product of the signal strength of the first RU among the other RUs and the area weight for reception areas having the same RU as a communication target includes:
obtaining a product of a signal strength of the first RU received in a first reception area among reception areas targeting the same RU and a weight assigned to the first reception area; and
Obtaining the product of the signal strength of the first RU received in a second reception area among reception areas targeting the same RU as a communication target and a weight assigned to the second reception area;
A copy cell grouping method for reducing interference in a wireless communication system. The method of claim 1,
The grouping of the copy cell groups based on the weighted interference amount between the plurality of copy cell groups composed of the plurality of RUs includes:
grouping the copy cell groups having the greatest amount of weighted interference between the two copy cell groups into one copy cell group based on the weighted interference amount between the plurality of copy cell groups including the plurality of RUs;
A copy cell grouping method for reducing interference in a wireless communication system. 8. The method of claim 7,
The grouping of the copy cell groups having the greatest amount of weighted interference between the two copy cell groups into one copy cell group includes:
grouping the plurality of RUs into a plurality of copy cell groups each having one element; and
grouping the first copy cell group and the second copy cell group into one specific copy cell group when the weighted interference amount between the first copy cell group and the second copy cell group is greatest among the plurality of copy cell groups; step; including
A copy cell grouping method for reducing interference in a wireless communication system. 9. The method of claim 8,
The grouping of the copy cell groups having the greatest amount of weighted interference between the two copy cell groups into one copy cell group includes:
With respect to the 'remaining copy cell groups excluding the first copy cell group and the second copy cell group among the plurality of copy cell groups' and the specific copy cell group, based on the weighted interference amount between the two copy cell groups Grouping the copy cell groups having the greatest amount of weighted interference between the two copy cell groups into one copy cell group; further comprising
A copy cell grouping method for reducing interference in a wireless communication system. 10. The method of claim 9,
The weighted interference amount between the specific copy cell group and the remaining copy cell groups is,
is the sum of 'weighted interference amount between the first copy cell group and the remaining copy cell groups' and 'weighted interference amount between the second copy cell group and the remaining copy cell groups'
A copy cell grouping method for reducing interference in a wireless communication system. 11. The method of claim 10,
The grouping of the copy cell groups having the greatest amount of weighted interference between the two copy cell groups into one copy cell group includes:
The method further comprising: grouping the copycell groups of different combinations when the maximum number of elements is exceeded when grouping the copycell groups with the greatest amount of weighted interference between the two copycell groups
A copy cell grouping method for reducing interference in a wireless communication system. 11. The method of claim 10,
The grouping of the copy cell groups having the greatest amount of weighted interference between the two copy cell groups into one copy cell group includes:
Stopping grouping of the copycell group having the maximum number of elements, and performing grouping on the remaining copycell groups; further comprising
A copy cell grouping method for reducing interference in a wireless communication system. 13. The method of claim 12,
Stopping grouping on the copycell group having the maximum number of elements and performing grouping on the remaining copycell groups includes:
setting the weighted interference amount between the copy cell group having the maximum number of elements and other copy cell groups to 0, and performing grouping on the remaining copy cell groups;
A copy cell grouping method for reducing interference in a wireless communication system. 8. The method of claim 7,
When the grouping is completed by repeating the step of grouping the copy cell groups with the greatest amount of weighted interference between the two copy cell groups into one copy cell group, a specific RU in the copy cell group for which the grouping is completed operates as a master cell, Other RUs in the group in which the grouping is completed operating as a copy cell; further comprising
A copy cell grouping method for reducing interference in a wireless communication system. an input unit for obtaining received signal strengths between a plurality of RUs in a copy cell group derivation area and a plurality of reception areas; and
Selecting a communication target of each of the plurality of reception areas from among the plurality of RUs based on the received signal strength, and obtaining a weighted interference amount between the plurality of RUs by performing acquisition of a weighted interference amount for the plurality of RUs and a control unit grouping the copy cell groups based on the weighted interference amount between the plurality of copy cell groups including the plurality of RUs;
The control unit is
Obtaining a weighted interference amount reflecting the interference amount and area weight by other RUs in reception areas having the same RU as a communication target
Copy cell grouping device. 16. The method of claim 15,
The area weight is
A higher value is assigned to a reception area requiring high radio quality compared to a reception area requiring low radio quality.
Copy cell grouping device. 16. The method of claim 15,
The control unit is
The weighted interference amount by the first RU in the communication area of the same RU by performing the product of the signal strength and the area weight of the first RU among the other RUs for the reception areas having the same RU as a communication target and then summing them to obtain,
The weighted interference amount by the second RU in the communication area of the same RU by performing the product of the signal strength and the area weight of the second RU among the other RUs for the reception areas having the same RU as the communication target and then summing them to obtain
Copy cell grouping device. 18. The method of claim 17,
The control unit is
The step of performing the product of the signal strength of the first RU among the other RUs and the area weight for reception areas having the same RU as a communication target includes:
obtaining a product of a signal strength of the first RU received in a first reception area among reception areas targeting the same RU and a weight assigned to the first reception area;
obtaining a product of a signal strength of the first RU received in a second reception area among reception areas targeting the same RU and a weight assigned to the second reception area
Copy cell grouping device. 16. The method of claim 15,
The control unit is
grouping the copycell groups having the largest amount of weighted interference between the two copycell groups into one copycell group based on the weighted interference amount between the plurality of copycell groups including the plurality of RUs;
Copy cell grouping device. A computer program stored in a medium for performing a copy cell grouping method, comprising:
obtaining received signal strengths between a plurality of RUs in a copycell group derivation area and a plurality of reception areas;
selecting an RU to be a communication target of each of the plurality of reception areas from among the plurality of RUs based on the received signal strength;
acquiring a weighted interference amount between the plurality of RUs by performing acquisition of a weighted interference amount for the plurality of RUs; and
grouping the copy cell groups based on the weighted interference amount between the plurality of copy cell groups composed of the plurality of RUs;
Acquiring the weighted interference amount between the plurality of RUs by performing the acquisition of the weighted interference amount for the plurality of RUs includes:
A computer program stored in a medium to perform a copy cell grouping method comprising the steps of: obtaining a weighted interference amount reflecting the area weight and the amount of interference by other RUs in reception areas having the same RU as a communication target.

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