KR102012264B1 - Method and apparatus for compensating outage cell in small cell network - Google Patents

Abstract

The network management apparatus determines whether the state of the first cell is an outage state in which a terminal belonging to the first cell cannot access the first cell. When the state of the first cell is an outage state, the network management device compensates for a cell that is in an energy saving state or that is different from the first cell among a plurality of neighboring cells existing around the first cell. Exclude the cell. The network management apparatus requests performance information of the plurality of base stations from a plurality of base stations serving remaining cells other than the excluded cell among the plurality of neighbor cells. The network management apparatus selects at least one compensation cell to participate in compensation of the first cell among the remaining cells based on the performance information of the plurality of base stations.

Description

METHOD AND APPARATUS FOR COMPENSATING OUTAGE CELL IN SMALL CELL NETWORK}

The present invention provides a method and apparatus for autonomous compensation (or service) of an area of an outage cell through cooperation of neighboring cells when an outage cell is recognized in a dense small cell network, and a control method therefor. And to an apparatus.

In the mobile communication network, a cell area means an area where a terminal can access a network through a base station. Mobile operators use cell planning tools to set the cell area of the mobile communication network based on user distribution and operate cell coverage to provide the best service to users. However, if the signal strength received by the terminal from the base station becomes weak due to a hardware (HW) error of the base station, a software (SW) error of the base station, a transmission path error, an electrical external error, or an excessive capacity of the cell, the error occurs. An outage cell occurs in a cell managed by a base station in which is generated. Most of the terminals located in the outage cell are unable to access the network. That is, a signal strength (eg, RSRP (reference signal received power) received from the base station by the terminal located in the area of the outage cell is weak, so that an attempt to connect to the base station (eg, RRC (radio resource control) connection) fails. In this case, a radio link failure (RLF) occurs in a terminal (eg, an RRC-connected terminal) connected to the corresponding base station, and thus the connection cannot be performed because the connection to the network is lost. Continues service, through handover to the neighboring cell.

When an outage cell occurs in the mobile communication network, the neighboring cell expands its service coverage and provides access service to a terminal located in the outage cell. In this case, the neighboring cell becomes a compensation cell (COC) of the outage cell. The compensation cell provides a service to the terminals located in the area of the outage cell. The terminal service performance connected to the neighbor cell may be degraded after the neighbor cell becomes the compensation cell, rather than before the neighbor cell becomes the compensation cell. That is, since a neighbor cell serving as a compensation cell provides a service to terminals located in an outage cell region, performance of providing the neighbor cell to terminals connected to the neighbor cell before the neighboring cell becomes a compensation cell may be degraded.

An object of the present invention is to provide a method and apparatus for minimizing performance degradation of terminals previously connected to a compensation cell that compensates for an area of an outage cell when generation of an outage cell is detected in a dense small cell network. will be.

According to an embodiment of the present invention, there is provided a method for a network management device to compensate a cell in an outage state. The outage cell compensation method of the network management apparatus may include determining whether a state of a first cell is an outage state in which a terminal belonging to the first cell cannot access the first cell; When the state of the first cell is an outage state, excluding a cell that is in an energy saving state or that compensates a cell different from the first cell among a plurality of neighboring cells existing around the first cell; Requesting performance information of the plurality of base stations from the plurality of base stations serving the remaining cells other than the excluded cells of the plurality of neighbor cells; And selecting at least one compensation cell to participate in compensation of the first cell among the remaining cells based on the performance information of the plurality of base stations.

The performance information of the plurality of base stations may include a central processing unit (CPU) occupancy rate of the plurality of base stations.

The selecting may include determining at least one first base station having a CPU occupancy lower than a first reference value among the plurality of base stations; And comparing the performance information and the performance reference information of the at least one first base station.

The comparing may include determining whether the at least one first base station satisfies a condition defined by (performance information of the at least one first base station / the performance reference information) <a second reference value. have.

The performance information of the at least one first base station may include traffic load of the at least one first base station, the number of access terminals of the at least one first base station, and the radio frequency (RF) transmission of the at least one first base station. It can include an output.

The performance reference information may include a maximum traffic load, a maximum number of access terminals, and a maximum RF transmission output.

The condition is the first condition defined as (traffic load / maximum traffic load) <second reference value, the second condition defined as (number of access terminals / maximum access terminal) <second reference value, and (RF transmission output / maximum). RF transmission power) may include a third condition defined as <second reference value.

The selecting may include selecting four cells serviced by the four or more first base stations as a compensation cell when the number of the base stations satisfying the condition is four or more among the at least one first base station. It may further include.

Two compensation cells of the four compensation cells may exist in symmetric positions with respect to the first cell, and the other two compensation cells may exist in symmetry positions with respect to the first cell.

The selecting may include selecting three cells serviced by the three first base stations as compensation cells when the number of the base stations satisfying the condition is three among the at least one first base station; And selecting two cells serviced by the two first base stations as compensation cells when the number of the base stations satisfying the condition is two among the at least one first base station.

The selecting may include activating a second cell in an energy saving state among the plurality of neighbor cells when the number of the base stations satisfying the condition among the at least one first base station is one or less; Requesting, by the base station serving the second cell, performance information of the base station serving the second cell; And determining whether the base station serving the second cell has a CPU occupancy less than or equal to the first reference value.

The selecting may include: when the number of the base stations satisfying the condition is one among the at least one first base station, the one first base station (performance information of the one first base station / the performance reference information). Determining whether the additional condition defined by the third reference value is satisfied; And when the one first base station satisfies the additional condition, selecting one cell serviced by the one first base station as a compensation cell.

The third reference value may be smaller than the second reference value.

According to another embodiment of the present invention, there is provided a method for a network management device to compensate a cell in an outage state. In the outage cell compensation method of the network management apparatus, when a state of a first cell is an outage state in which a terminal belonging to the first cell cannot access the first cell, the outage cell compensation method exists in the vicinity of the first cell. Selecting at least one compensation cell to compensate for the first cell among a plurality of neighboring cells; And when the number of the at least one compensation cell is four, two of the four compensation cells serve a part of the area of the first cell and the other two compensation cells of the four compensation cells Requesting base station reconfiguration from first base stations providing the four compensation cells to serve the remaining of the area of the first cell.

Two compensation cells of the four compensation cells may exist in symmetrical positions with respect to the first cell, and the other two compensation cells may exist in symmetrical positions with respect to the first cell.

The requesting of the base station reconfiguration from the first base station may include: changing antenna configuration information of the first base stations to expand an area of the four compensation cells; And requesting the first base stations for antenna reconfiguration based on the changed antenna configuration information.

The changed antenna configuration information includes a changed antenna radio frequency (RF) transmission output value of the first base stations, a changed antenna tilt value of the first base stations, and a changed antenna gain value of the first base stations. can do.

The requesting the base station reconfiguration from the first base stations may further include storing antenna configuration information set for the first base stations before antenna reconfiguration for the first base stations.

The requesting of the base station reconfiguration to the first base station may include: when the base station access success rate of the terminals existing in the region of the first cell is greater than or equal to a first reference value, the four compensation cells compensate for the first cell; And storing the antenna configuration information set to the first base stations for the compensation of the first cell.

The requesting of the base station reconfiguration to the first base station may include changing the antenna configuration information of the first base station when the base station connection success rate of the terminals existing in the region of the first cell is smaller than a first reference value. The method may further include requesting the first base stations to reconfigure the antenna based on the changed antenna configuration information.

In the outage cell compensation method of the network management apparatus, when the number of the at least one compensation cell is three, the three compensation cells serve the part or all of the area of the first cell. And requesting base station reconfiguration from second base stations controlling the compensation cell.

The requesting of the base station reconfiguration from the second base stations may include: antennas of the second base stations based on relative positions of the three compensation cells with respect to the first cell in order to expand the area of the three compensation cells. Changing configuration information; And requesting the second base stations for antenna reconfiguration based on the changed antenna configuration information.

In the outage cell compensation method of the network management apparatus, when the number of the at least one compensation cell is two, the antenna configuration information of the second base stations controlling the two compensation cells is determined by the area of the two compensation cells. The method may further include requesting the second base stations to reconfigure for extension and to perform antenna reconfiguration based on the changed antenna configuration information.

In the outage cell compensation method of the network management apparatus, when the number of the at least one compensation cell is one, the second base station controlling the one compensation cell (performance information / performance criteria of the second base station) Information) <determining whether the condition defined by the reference value is satisfied; And when the second base station satisfies the condition, the antenna configuration information of the second base station is changed to extend the area of the one compensation cell and the antenna reconfiguration based on the changed antenna configuration information is transmitted to the second base station. The request may further include a step.

In addition, according to another embodiment of the present invention, there is provided a method for a network management device to compensate a cell in an outage state. In the outage cell compensation method of the network management apparatus, when a state of a first cell is an outage state in which a terminal belonging to the first cell cannot access the first cell, the outage cell compensation method exists in the vicinity of the first cell. Selecting at least one compensation cell to compensate for the first cell among a plurality of neighboring cells; Storing antenna configuration information of at least one base station providing the at least one compensation cell as first antenna configuration information; Changing antenna configuration information of the at least one base station to expand the at least one compensation cell; And requesting the at least one base station for antenna reconfiguration based on the first antenna configuration information when the first cell is restored from an outage state to a normal state.

The changing may include storing the changed antenna configuration information as second antenna configuration information.

The second antenna configuration information includes a modified antenna radio frequency (RF) transmission output value of the at least one base station, a changed antenna tilt value of the at least one base station, and a changed antenna gain of the at least one base station. gain) value.

According to an embodiment of the present invention, when the outage cell is detected in the dense small cell network, the network management apparatus may select a compensation cell from neighbor cells of the outage cell.

Further, according to an embodiment of the present invention, a plurality of compensation cells (or a plurality of base stations providing the same) divides and compensates the area of the outage cell, so that the terminal located in the area of the outage cell provides a service in a short time. I can receive it.

In addition, according to an embodiment of the present invention, even if a failure occurs in a base station serving a specific cell area in a dense small cell network, by providing a seamless service, it is possible to improve the mobile communication service quality.

1 is a diagram illustrating a method of compensating an outage cell according to an embodiment of the present invention.
2 is a diagram illustrating a mobile communication network structure according to an embodiment of the present invention.
3 is a diagram illustrating a cell configuration, according to an embodiment of the invention.
4A, 4B, and 4C are diagrams illustrating a method of selecting a compensation cell among neighboring cells according to an embodiment of the present invention.
5A, 5B, and 5C are diagrams illustrating how selected compensation cells compensate an area of an outage cell according to an embodiment of the present invention.
6 is a diagram illustrating a case in which four neighboring cells compensate for an outage cell according to an embodiment of the present invention.
7 is a diagram illustrating a method in which one neighbor cell compensates for an outage cell according to an embodiment of the present invention.
8 illustrates a computing device, in accordance with an embodiment of the invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

In this specification, duplicate descriptions of the same components are omitted.

Also, in the present specification, when a component is referred to as being 'connected' or 'connected' to another component, the component may be directly connected to or connected to the other component, but in between It will be understood that may exist. On the other hand, in the present specification, when a component is referred to as 'directly connected' or 'directly connected' to another component, it should be understood that there is no other component in between.

Also, the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Also, in this specification, the singular forms may include the plural forms unless the context clearly indicates otherwise.

Also, as used herein, the term 'comprises' or 'having' is only intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more. It is to be understood that it does not exclude in advance the possibility of the presence or addition of other features, numbers, steps, actions, components, parts or combinations thereof.

Also in this specification, the term 'and / or' includes any combination of the plurality of listed items or any of the plurality of listed items. In the present specification, 'A or B' may include 'A', 'B', or 'both A and B'.

Further, in the present specification, a terminal includes a mobile terminal, a mobile station, an advanced mobile station, a high reliability mobile station, a subscriber station, It may also refer to a portable subscriber station, an access terminal, a user equipment (UE), or the like, and may include a terminal, a mobile terminal, a mobile station, an advanced mobile station, a high reliability mobile station, a subscriber station, a portable terminal. It may also include all or part of the functionality of a subscriber station, access terminal, user equipment and the like.

Also, in the present specification, a base station (BS) includes an advanced base station, a high reliability base station, a node B (node B, NB), an advanced node B (evolved node B, eNodeB (eNB), access point, access point, radio access station, base transceiver station, base station (mobile multihop relay) -BS, relay station serving as base station, base station It may also refer to a high reliability relay station (repeater), a repeater, a macro base station, a small base station, etc., which perform a role, a base station, an advanced base station, an HR-BS, a NodeB, an eNodeB, an access point, a wireless access station, It may include all or part of the functions of a transmission / reception base station, an MMR-BS, a repeater, a high reliability repeater, a repeater, a macro base station, a small base station, and the like.

1 is a diagram illustrating a method of compensating an outage cell according to an embodiment of the present invention. In detail, FIG. 1 illustrates a process of compensating an outage cell through base station antenna reconfiguration.

The UE connects to the external Internet through access of a base station in cell coverage and performs a service. The mobile network operator determines mobile communication network service coverage through careful cell planning in order to provide a constant level of service to users. However, due to a sudden physical failure (eg, a base station hardware error, a base station software error, a transmission error, an electrical external error, a switch-off for energy saving, etc.), the terminal may access the network. Uncountable outage cells occur.

When the network management device NM10 recognizes the occurrence of the outage cell in the dense small cell network, the current management information (eg, traffic) of neighbor cells (or base stations providing (or controlling)) located around the outage cell is detected. Load information, connected user information, antenna transmission power, and central processing unit (CPU) occupancy). For example, the network management device NM10 may include neighboring base stations (eg, eNB-B, eNB-C, eNB-D, etc.) located in the vicinity of an outage cell (or a base station (eg, eNB-A) providing the same). The eNB-E, eNB-F, and eNB-G may request to report the current performance status of each base station (eg, eNB-B to eNB-G). The network management device NM10 receives performance state information from neighbor base stations (eg, eNB-B to eNB-G).

The network management apparatus NM10 selects a compensation cell (or a base station providing the same) suitable for compensation of the outage cell based on the reported performance state information of each neighboring cell (or a base station providing the same). 1 illustrates an example in which four base stations (eg, eNB-C, eNB-D, eNB-F, and eNB-G) are selected as compensation base stations among neighboring base stations (eg, eNB-B to eNB-G). It is.

The network management device NM10 considers each compensation cell base station (eg, a base station) in consideration of the location of the outage cell and the location of the selected compensation cell (or a base station providing the same) in order for the selected compensation cell to compensate for the outage cell. The antenna radio frequency (RF) transmission output value, antenna tilt value, and antenna gain value of the eNB-C, eNB-D, eNB-F, and eNB-G are determined. The network management apparatus NM10 may determine a compensation cell (or a compensation base station (eg, eNB-C, eNB-D, eNB-F) based on the determined value (eg, antenna RF transmission output value, antenna tilt value, and antenna gain value). , eNB-G)) to request each compensation cell base station (eg, eNB-C, eNB-D, eNB-F, eNB-G). The network management device NM10 is informed of the reconfiguration result from the compensation cell base station (eg, eNB-C, eNB-D, eNB-F, eNB-G).

After the reconfiguration of the associated compensation cell base stations is completed, the network management device NM10 and the compensation base station (eg, eNB-C, eNB-D, eNB-F, eNB-G) have a terminal access success rate in the outage cell region. Check if it is above this threshold. After the base station reconfiguration, if the terminal access success rate in the area of the outage cell is higher than the reference value, the network management device NM10 completes the compensation process for the outage cell. Each base station (eg, eNB-C, eNB-D, eNB-F, eNB-G) is composed of a process in which outage cell compensation is completed.

When the network management apparatus NM10 recognizes that the base station controlling the outage cell is normally restored, the network management device NM10 compensates for the outage cell (or a compensation base station (eg, eNB-C, eNB-D, eNB-F). , eNB-G)), to reconfigure (eg, antenna reconfigure) to a state prior to compensation.

In a dense small cell network, a neighbor cell may be composed of many cells, and it is important to select a cell suitable for compensation among many cells.

Hereinafter, a method and apparatus for controlling an outage cell will be described. Specifically, when the occurrence of an outage cell is detected in a dense small cell network, a method for selecting at least one suitable compensation cell (or at least one base station providing the same) that can participate in compensating for the area of the outage cell among neighboring cells. It demonstrates. Here, the compensation cell may be a cell rich in spare resources. In addition, a method in which at least one selected compensation cell divides an area of an outage cell to compensate (or service) the method will be described. In addition, a method of minimizing the decrease in performance after the corresponding cell is changed to the compensation cell is provided to the terminal connected in the area of the serving cell. In addition, when the outage cell is normally restored, a method of quickly restoring the compensation cell to the previous cell state will be described.

1. Mobile communication network management structure

2 is a diagram illustrating a mobile communication network structure according to an embodiment of the present invention.

As illustrated in FIG. 2, the network management apparatus NM10 collects the information transmitted by the UE and the base station eNodeB in real time and always monitors the network state. When an error occurs in the base station, the network management device NM10 maintains network performance in an optimized state through analyzing related information and reconfiguring the network. The network management apparatus NM10 includes an integration reference point (IRP) manager function, and the base station eNodeB includes an IRP agent function. The network management apparatus NM10 and the base station eNodeB exchange information through an Itf-N interface (eg, a remote procedure call (RPC) method).

As illustrated in FIG. 2, the UE UE is connected to a base station eNodeB (eg, connected-state), and is measured by RSRP / RSRQ (reference signal received quality), RLF report, location information, Channel quality indication (CQI) information is transmitted to the base station. The terminal transmits the information of the serving cell and the neighboring cell information measured by the terminal in the idle state (idle-state) to the base station. The base station stores and manages the measurement information transmitted by the terminal. Such information is utilized as basic information for the network management device NM10 to determine the outage cell.

As illustrated in FIG. 2, the base station eNodeB stores and manages current performance state information of the base station (eg, traffic load state, number of connected users, antenna transmit power, and CPU occupancy rate) in real time. When the IRP manager of the network management device NM10 requests relevant information from the base station using an RPC method (eg, GetParameterValues Request), the IRP agent of the base station sends the information to the network management device through the RPC method (eg, GetParameterValues Response). Send to (NM10).

The eNodeB communicates with an evolver packet core (EPC) connected to the Internet via an S1 interface. The base station eNodeB communicates with another base station eNodeB via an X2 interface.

3 is a diagram illustrating a cell configuration, according to an embodiment of the invention.

Specifically, in the cell deployment environment illustrated in FIG. 3, the network operator constructs 14 cells (eg, Cell-A, Cell-B, Cell-C, ..., Cell-N) according to the cell plan, and each cell. (Eg, Cell-A to Cell-N) receives service from one base station (eg, eNB-A, eNB-B, ..., eNB-N).

The base station eNB-A serving the cell Cell-A provides an Internet service through a wireless connection with terminals located in the cell Cell-A.

As illustrated in FIG. 3, six peripheral cells (eg, Cell-B, Cell-C, Cell-D, Cell-E, Cell-F, and Cell-G) exist around the cell (Cell-A). do. In a position where the cell (Cell-A) and neighboring cells (eg, Cell-B to Cell-G) overlap, the terminal may access a base station (eNodeB) that provides better signal quality and perform a mobile communication service.

Hereinafter, an embodiment of the present invention will be described taking the cell building environment illustrated in FIG. 3 as an example.

As illustrated in Table 1 below (cell-base station performance reference value), the network management apparatus NM10 manages performance reference values (or performance threshold values) of all base stations and antenna configuration information of all base stations. As illustrated in Table 2 (peripheral cell information) below, the network management apparatus NM10 manages information about neighbor cells.

Cell Information Cell-a Cell-b Cell-c Cell-d Cell-e Cell-f Base station ID eNB-A eNB-B eNB-C eNB-D eNB-E eNB-F Max Traffic Performance (or Max Traffic Load) A1 B1 C1 D1 E1 F1 Maximum number of concurrent user (or endpoint) connections A2 B2 C2 D2 E2 F2 Antenna maximum RF transmit power value A3 B3 C3 D3 E3 F3 RF transmit power value before compensation A3-1 B3-1 C3-1 D3-1 E3-1 F3-1 RF transmit power value during compensation A3-2 B3-2 C3-2 D3-2 E3-2 F3-2 Antenna Tilt value before compensation A4 B4 C4 D4 E4 F4 Antenna Tilt Values During Compensation A4-2 B4-2 C4-2 D4-2 E4-2 F4-2 Antenna gain value before compensation A5 B5 C5 D5 E5 F5 Antenna gain value during compensation A5-2 B5-2 C5-2 D5-2 E5-2 F5-2

For example, in Table 1, the maximum traffic load provided by the base station eNB-A serving an area of the cell Cell-A is A1, and the maximum number of users is A2. The maximum RF transmission power value is A3, the RF transmission power value before compensation is A3-1, and the changed RF transmission power value (RF transmission power value during compensation) for compensation of the outage cell is A3-2, the antenna tilt value before compensation is A4, the changed antenna tilt value for compensation of the outage cell (antenna tilt value during compensation) is A4-2, the antenna gain value before compensation is A5, out The antenna gain value (antenna compensation value during compensation) changed for compensation of the voltage cell is A5-2.

Cell ID Peripheral cell and location information Cell-a Cell name Cell-b Cell-c Cell-d Cell-e Cell-f Cell-g location
(Based on Cell-A) N EN ES S WS WN Cell-b Cell name Cell-a Cell-g Cell-h Cell-i Cell-j Cell-c location
(Based on Cell-B) S E EN N WN WS Cell-c Cell name Cell-d Cell-a Cell-b Cell-j Cell-k Cell-l location
(Based on Cell-C) S E EN N W WS

In Table 2, information (eg, cell name, cell location) about a cell constructed through a cell operator's cell plan and neighboring cells is illustrated.

For example, in the periphery of the cell (Cell-A), the cell (Cell-B) in the north direction (N), the cell (Cell-C) in the northeast direction (EN) Cell-D in the direction ES, Cell-E in the south direction S, Cell-F in the southwest direction WS, and Cell-G in the northwest direction WN. ) Is built. The cell Cell-B and the cell-E are symmetrically positioned with respect to the cell Cell-A.

The information illustrated in Table 2 (eg, locations of neighboring cells (eg, Cell-B to Cell-G)) are areas of the cell (Cell-A) when the cell (Cell-A) is recognized as an outage cell. It is an important data for the selection of the compensation cell that services the.

Table 3 (cell-base station compensation status and energy saving status) below shows whether the network management device NM10 is currently in the compensation service status for all cells (eg, Cell-A to Cell-N) and whether the energy saving status is low. The case of management is illustrated.

Cell Information Cell-b Cell-c Cell-d Cell-e Cell-f Cell-g Base station ID eNB-B eNB-C eNB-D eNB-E eNB-F eNB-G Compensation cell no-exist Cell-a Cell-a no-exist Cell-a Cell-a In energy saving state
(Energy Saving State) yes no no no no no

In the initial state when the network is installed, all of the neighbor cells of the base station do not participate in the compensation service and energy saving. When a compensation cell that compensates (or services) an outage cell or an energy saving cell occurs according to an environment change, as illustrated in Table 3, the network management device NM10 is connected to the compensation cell or the energy saving cell. The state of the corresponding base station is changed (for example, eNB-C: 'no-exist'-> 'Cell-A', eNB-B: 'no'-> 'yes').

For example, in Table 3, a cell (Cell-C), a cell (Cell-D), a cell (Cell-F), and a cell (Cell-G) compensate (or service) an area of the cell (Cell-A). The case where the cell (Cell-B) is doing energy saving is illustrated. The information illustrated in Table 3 is used to select a compensation cell for compensating the area of the outage cell.

2. Outage  Compensate Cells compensate To select the surrounding cells

When the terminal access probability suddenly drops below the reference value for the base station serving a specific cell area and the rate at which the ongoing service is interrupted becomes higher than the reference value, the network management device NM10 indicates that an outage cell has occurred. Be aware.

In a state in which a specific cell is out ageed, all attempts by the terminal to connect to the cell (or a base station serving the cell) (eg, RRC connection) fail. In addition, the RLF is generated in the terminal connected to the base station, so that the network connection (connection) is released or a small number of terminals located in the border region access the neighboring cell through the handover process.

4A, 4B, and 4C are diagrams illustrating a method of selecting a compensation cell among neighbor cells of an outage cell according to an embodiment of the present invention.

When the network management device NM10 detects the outage cell, the neighbor cells of the outage cell and the base stations serving the neighboring cells are examined through the information of Tables 1 and 2 (S11).

The network management device NM10, based on the information in Table 3, may be a neighboring cell (or an energy saving state (ES) that does not compensate for another cell at the same time among the neighboring cells of the outage cell). The current state of the base station to be provided) is examined (S12). That is, the network management apparatus NM10 excludes a cell that is in an energy saving state or compensates for a cell different from the outage cell among neighbor cells of the outage cell. If the cell that satisfies the condition of step S12 does not exist, the network management device NM10 performs step S20 below.

The network management device NM10 transmits the current performance state information of the neighboring cell base station (for example, traffic load, number of connected users) to all base stations serving the neighboring cells surveyed through the S12 process (hereinafter, 'near cell base station'). RF transmission power, CPU occupancy, etc.) is requested (S13).

The network management apparatus NM10 checks the performance state information reported from the neighboring cell base stations and determines base stations having a CPU occupancy lower than a reference value (eg, 85%) among the neighboring cell base stations. The network management apparatus NM10 continues the compensation cell selection method for base stations having a CPU occupancy lower than a reference value (eg, 85%) among neighboring cell base stations (S14). If there is no base station having a CPU occupancy lower than a reference value (eg, 85%) among neighboring cell base stations, the network management apparatus NM10 performs the following S20 process.

The network management apparatus NM10 collects performance state information (eg, traffic load information, connected user information, antenna transmission power) collected from neighbor cell base stations of the outage cell (eg, neighbor cell base stations satisfying step S14). Or RF transmission power) and the like, and the base station performance reference values (eg, maximum traffic performance, maximum number of simultaneous user connections, maximum RF transmission power, etc.) stored in Table 1 (S15). In addition, based on the comparison result, the network management device NM10 may perform the following three conditions (i.e., (performance state information / base station of the neighboring cell base station) among the neighboring cell base stations (eg, neighboring cell base station satisfying step S14). The neighboring cell base stations satisfying the performance reference value) <condition defined by the threshold value) are examined (S15). The network management device NM10 may set thresholds for the following conditions. Under the following conditions, the threshold may initially be set to 0.6 and may change according to network operator policy.

Condition 1: (traffic load / maximum traffic load threshold) <threshold (e.g. 0.6)

Condition 2: (number of connected users / maximum number of connected users) <threshold (eg 0.6)

Condition 3: (antenna transmit power / antenna maximum RF transmit power) <threshold (eg 0.6)

If there is a neighbor cell base station satisfying all three conditions of the process S15, the network management apparatus NM10 may process the process S17, S18 according to the number of neighbor cell base stations that satisfy the selected neighbor cell base station (eg, the neighbor cell base station that satisfies the process S15). Process, and one of processes S19 (S16). Specifically, the network management apparatus NM10 performs process S17 when the number of neighbor cell base stations satisfying process S15 is four or more. The network management apparatus NM10 performs a process S18 when the number of neighboring cell base stations satisfying the process S15 is three. The network management device NM10 performs process S19 when the number of neighboring cell base stations satisfying process S15 is two. The network management device NM10 performs process S21 when the number of neighbor cell base stations satisfying process S15 is one. If the number of neighboring cell base stations satisfying step S15 is one or less, the network management device NM10 performs step S20.

When the number of neighbor cell base stations (eg, neighbor cell base stations satisfying S15 process) is 4 or more, the network management device NM10 may be serviced by the corresponding 4 or more neighbor cell base stations. 2 pairs of cells (eg, {Cell-D and Cell-G}, {Cell-C and Cell-F}) which are symmetrical with respect to an outage cell (eg, Cell-A) Or 4 neighboring cell base stations) are selected as compensation cells (or compensation base stations) that compensate the outage cell (S17). The network management apparatus NM10 starts a procedure of compensating outage cells through processes beginning with 'four peripheral compensation cells' S40 illustrated in FIG. 5A (S17). In a compact small cell environment, there may be more than 10 peripheral cells of a particular cell. In the method according to an embodiment of the present invention, four suitable cells are selected from the neighbor cells.

When the number of neighboring cell base stations (eg, neighbor cell base stations satisfying S15 process) is three, the network management device NM10 corresponds to three neighboring cell base stations (or corresponding 3). Three neighbor cells) serviced by the three neighbor cell base stations) are selected as a compensation base station (or a compensation cell) that compensates for the outage cell (S18). The network management apparatus NM10 starts a process of compensating outage cells through processes beginning with 'three peripheral compensation cells' S50 illustrated in FIG. 5B (S18).

When the number of neighboring cell base stations (eg, neighboring cell base stations satisfying S15 process) is two, the network management device NM10 corresponds to the two neighboring cell base stations (or corresponding 2). Two neighbor cells) serviced by the two neighbor cell base stations) are selected as a compensation base station (or a compensation cell) that compensates the outage cell (S19). The network management apparatus NM10 starts a procedure of compensating outage cells through processes beginning with 'two peripheral compensation cells' S60 illustrated in FIG. 5C (S19).

When there is no suitable neighbor cell in the above-described S12 process, S14 process, or S16 process (for example, when there is no neighbor cell base station satisfying the S12 process, S14 process, or S16 process), the network management apparatus ( NM10 activates (or switch-on, releases energy saving state) among neighbor cells in Table 3 (or neighbor cell base stations serving it) energy-serving neighbor cells (or neighbor cell base stations serving it), After a predetermined time (for example, about 15 minutes), request the current neighboring cell base station to transmit the current performance information (e.g., traffic load, number of connected users, RF transmission power, CPU occupancy, etc.) (S20). . Thereafter, the network management apparatus NM10 selects a suitable compensation cell by performing a process S14, a process S15, and a process S16 (S20). If one compensation base station (or compensation cell) is selected through this process, the network management apparatus NM10 performs the method illustrated in FIG. 7 (that is, one neighbor cell compensates for the outage cell). (S21). If one or more compensation base stations (or compensation cells) are not selected through this process, the network management device NM10 notifies the network operator of the failure of the compensation cell selection.

3. Outage  How to compensate an area of cells

The network management apparatus NM10 performs the compensation service for the area of the outage cell by the neighboring cell base stations selected for serving the area of the outage cell to increase the RF transmission power and adjust the antenna tilt information and the antenna gain information. Request cell reconfiguration from the selected neighbor cell base stations.

Hereinafter, a method in which the network management device NM10 serves the area of the outage cell will be described.

5A, 5B, and 5C are diagrams illustrating how selected compensation cells compensate an area of an outage cell according to an embodiment of the present invention. 6 is a diagram illustrating a case in which four neighboring cells compensate for an outage cell according to an embodiment of the present invention.

As illustrated in FIG. 5A, when four neighboring cell base stations (or four neighboring cells) are selected to compensate an outage cell, the network management device NM10 may have one pair of base stations among the four neighboring cell base stations. (Two base stations present in symmetrical locations) serve 80% of the area of the outage cell, and the remaining pair of base stations of the four neighboring cell base stations serve the remaining 20% of the area of the outage cell, Requests are made to four neighboring cell base stations (S41, S42, S43). That is, one pair of neighboring cells provided by (or controlled by) a pair of neighboring cell base stations (which are symmetrical with respect to the outage cell) serve 80% of the area of the outage cell and the other pair The network management device NM10 provides two pairs of neighbor cells such that a pair of neighbor cells provided by the neighbor cell base station (existing in symmetry with respect to the outage cell) serve 20% of the area of the outage cell. The base station may request base station reconfiguration. Specifically, the network management apparatus NM10 determines (or changes) antenna configuration information (eg, antenna RF transmission power value, antenna tilt value, and antenna gain value) of each of four neighboring cell base stations, and then selects a cell service area ( Alternatively, reconfiguration (eg, antenna reconfiguration based on the changed antenna configuration information) for extension of coverage may be requested to each of four neighboring cell base stations (S42, S43, and S44).

The network management apparatus NM10, according to Table 1, includes antenna configuration information (eg, antenna RF transmit power value before compensation, antenna tilt value before compensation), which is configured for four neighboring cell base stations before compensation (or before antenna reconfiguration). Antenna gain value before compensation).

After a specific time elapses, the network management apparatus NM10 calculates a base station access success probability (hereinafter, referred to as a terminal access success rate) of terminals located in an outage cell region (S45).

If the UE access success rate is greater than or equal to the reference value (eg, 95%), the network management device NM10 confirms that the cell compensation process is completed and ends the base station reconfiguration process (S46).

If the terminal access success rate is less than the reference value (eg, 95%), the NM10 may determine antenna configuration information (eg, antenna RF transmission power value, antenna tilt value, and antenna gain value of four neighboring cell base stations). After resetting or rechanging (e.g., increasing or decreasing), a base station reconfiguration (e.g., antenna reconfiguration based on the changed antenna configuration information) is requested to each of the four neighboring cell base stations. After completion of the reset process, the network management device NM10 receives the antenna configuration information of the base station (eg, antenna RF transmit power value, antenna tilt value, and antenna gain value) when the terminal access success rate is less than the reference value (eg, 95%). The reset process is performed up to two additional times. When the network management device NM10 performs the reset process up to four times, if the terminal access success rate by the four reset processes is less than the reference value (eg, 95%), the antenna configuration information reset four times Each of the four neighboring cell base stations is requested to perform base station reconfiguration with antenna configuration information (eg, antenna RF transmit power value, antenna tilt value, and antenna gain value) that support the highest terminal access success rate among them. At this time, the network management device NM10 notifies the network operator of the terminal access success rate. For this method, all antenna configuration information (eg, antenna RF transmit power value, antenna tilt value, and antenna gain value) determined in four resetting processes are temporarily stored.

When the reconfiguration process for the compensation of the outage cell (eg, Cell-A) is completed, the network management apparatus NM10 stores in Table 3 that neighbor cells of the outage cell compensate for the outage cell. In addition, the network management device NM10 may perform antenna configuration information of neighboring cell base stations performing compensation of the outage cell (eg, changed antenna RF transmission power value for compensation of the outage cell, changed antenna for compensation of the outage cell). The tilt value and the changed antenna gain value for compensation of the outage cell) are stored in Table 1.

For example, as illustrated in FIG. 6, when the network management apparatus NM10 recognizes that the cell Cell-A is in an outage state, four compensation base stations (or compensation cells) among neighbor cell base stations are selected. Determine the antenna configuration information (e.g., antenna RF transmit power value, antenna tilt value, antenna gain value) of the four compensation base stations, and reset the antenna with the determined antenna configuration information (e.g., increase or decrease) May be required for each compensation base station. In this manner, the four compensation base stations (or compensation cells) may extend their service areas to serve the divided areas of the area served by the outage cell (Cell-A). In the situation illustrated in FIG. 6, as illustrated in Table 3, the extended cells, that is, peripheral cells (Cell-C, Cell-D, Cell-F, and Cell-G) of the cell (Cell-A) are outaged. Compensating the in-cell (Cell-A) and the neighboring cell (Cell-B) is an energy saving state.

Meanwhile, as illustrated in FIG. 5B, when the network management apparatus NM10 selects three neighbor cell base stations to compensate for the outage cell, the three neighbor cell base stations cover 95% or more of the area of the outage cell. The three neighboring cell base stations are requested to serve (S51 and S52). That is, the network management device NM10 may request the base station reconfiguration from the three neighbor cell base stations so that three neighbor cells provided by the three neighbor cell base stations serve 95% or more of the area of the outage cell. In more detail, the network management apparatus NM10 may include antenna configuration information of three neighbor cell base stations based on relative position information of each of the three neighbor cell base stations (eg, relative positions of three neighbor cells around an outage cell). (E.g., set an antenna RF transmit power value, an antenna tilt value, and an antenna gain value) (S51), and reconfigure for expansion of a cell service area (or coverage) (e.g., based on the set antenna configuration information) Antenna reconfiguration) may be requested to three neighboring cell base stations (S52).

In Table 1, the NM10 displays antenna configuration information (eg, antenna RF transmission power value before compensation, antenna tilt value before compensation, and antenna gain value before compensation) for three selected neighbor cell base stations. Register (or save).

After a specific time has elapsed, the network management apparatus NM10 calculates a base station access success probability (terminal access success rate) of terminals located in an outage cell region (S53). At this time, if the terminal access success rate is greater than or equal to the reference value (eg, 95%), the network management apparatus NM10 confirms that the cell compensation function is completed and ends the base station reconfiguration (S54).

If the terminal access success rate is less than the reference value (eg, 95%), the NM10 may determine antenna configuration information (eg, antenna RF transmission power value, antenna tilt value, and antenna gain value of three selected neighboring cell base stations). After resetting (e.g., increasing or decreasing), the base station reconfiguration is requested from each of the three neighboring cell base stations. The network management device NM10 performs this resetting process, i.e., if the terminal access success rate is less than the reference value (eg, 95%), the antenna management information of the base station (eg, antenna RF transmission power value, antenna tilt value, and antenna gain value). The reset process is performed up to two additional times. When the network management device NM10 performs the reset process up to four times, if the terminal access success rate by the four reset processes is less than the reference value (eg, 95%), the antenna configuration information reset four times Each of the three neighboring cell base stations is requested to perform base station reconfiguration with antenna configuration information (eg, antenna RF transmit power value, antenna tilt value, and antenna gain value) that support the highest terminal access success rate among them. At this time, the network management device NM10 notifies the network operator of the terminal access success rate. For this method, all antenna configuration information (eg, antenna RF transmit power value, antenna tilt value, and antenna gain value) determined in four resetting processes are temporarily stored.

When the network management device NM10 completes the reconfiguration process for the compensation of the outage cell (eg, Cell-A), the neighbor cells (eg, three neighboring cells) of the outage cell compensate for the outage cell. Store in Table 3. In addition, the network management apparatus NM10 may perform antenna configuration information of the neighbor cell base station (eg, three neighboring base stations) performing the compensation of the outage cell (eg, an antenna RF transmit power value changed to compensate for the outage cell, and out). The antenna tilt value changed for the compensation of thetage cell and the antenna gain value changed for the compensation of the outage cell) are stored in Table 1.

Meanwhile, as illustrated in FIG. 5C, when the NM10 selects two neighbor cell base stations to compensate for the outage cell, the two neighbor cell base stations cover 90% or more of the area of the outage cell. The two neighboring cell base stations are requested to serve (S61 and S62). That is, the network management apparatus NM10 may request the base station reconfiguration from the two neighbor cell base stations so that two neighbor cells provided by the two neighbor cell base stations serve 90% or more of the area of the outage cell. Specifically, the network management apparatus NM10 sets (or changes) antenna configuration information (eg, antenna RF transmission output value, antenna tilt value, and antenna gain value) of each of two neighboring cell base stations (S61), and performs a cell service. A reconfiguration (eg, antenna reconfiguration based on the set antenna configuration information) for extending the area (or coverage) may be requested to two neighboring cell base stations (S62).

In Table 1, the network management apparatus NM10 displays antenna configuration information (eg, antenna RF transmission power value before compensation, antenna tilt value before compensation, and antenna gain value before compensation) for two selected neighbor cell base stations. Register (or save).

After a specific time elapses, the network management apparatus NM10 calculates a base station access success probability (terminal access success rate) of terminals located in an outage cell region (S63). At this time, if the terminal access success rate is more than the reference value (for example, 90%), the network management device NM10 confirms that the cell compensation function is completed and ends the base station reconfiguration (S64).

If the terminal access success rate is less than the reference value (eg, 90%), the NM10 may determine antenna configuration information (eg, antenna RF transmit power value, antenna tilt value, and antenna gain value of two selected neighboring cell base stations). After resetting (e.g., increasing or decreasing), the base station reconfiguration is requested from each of the two neighboring cell base stations. When the network management device NM10 performs this resetting process, that is, the terminal access success rate is lower than the reference value (eg, 90%), the network management device NM10 may determine the antenna configuration information of the base station (eg, antenna RF transmission power value, antenna tilt value, and antenna gain value). The reset process is performed up to two additional times. When the network management device NM10 performs the reset process up to four times, if the terminal access success rate by the four reset processes is less than the reference value (eg, 95%), the antenna configuration information reset four times Each of the two neighboring cell base stations is requested to perform base station reconfiguration with antenna configuration information (eg, antenna RF transmit power value, antenna tilt value, and antenna gain value) that support the highest terminal access success rate among them. At this time, the network management device NM10 notifies the network operator of the terminal access success rate. For this method, all antenna configuration information (eg, antenna RF transmit power value, antenna tilt value, and antenna gain value) determined in four resetting processes are temporarily stored.

When the network management device NM10 completes the reconfiguration process for the compensation of the outage cell (eg, Cell-A), the neighbor cells (eg, two neighboring cells) of the outage cell compensate for the outage cell. Store in Table 3. In addition, the network management apparatus NM10 may perform antenna configuration information of the neighbor cell base station (eg, two neighbor base stations) performing compensation of the outage cell (eg, an antenna RF transmit power value changed for compensation of the outage cell, outage). The antenna tilt value changed for the compensation of the cell and the antenna gain value changed for the compensation of the outage cell) are stored in Table 1.

7 is a diagram illustrating a method in which one neighbor cell compensates for an outage cell according to an embodiment of the present invention.

As illustrated in FIG. 7, when the NM10 selects one neighboring cell base station to compensate an outage cell, the network management device NM10 selects performance information reported from the selected base station and base station performance reference values stored in Table 1. Comparison is made (S71). Based on the comparison result, the network management apparatus NM10 determines that the selected one neighboring cell base station has the following three conditions (that is, (performance state information / base station performance reference value of one neighboring cell base station) <threshold x It is determined whether all of the conditions defined by (S71). The network management device NM10 may set a threshold x for the following conditions. The threshold x may be smaller than the threshold for the condition of the process S15. Under the conditions below, the threshold x may initially be set to 0.5 and may change according to network operator policy.

Condition 1: (traffic load / maximum traffic load threshold) <threshold x

Condition 2: (number of connected users / maximum number of connected users) <threshold x

Condition 3: (antenna transmit power / maximum RF transmit power) <threshold x

When the selected one neighbor cell base station does not satisfy the three conditions, the network management device NM10 stops selecting a compensation cell for the outage cell (S75).

The network management device NM10 is configured such that when one selected neighbor cell base station satisfies all three conditions, one neighbor cell base station compensates (or services) 80% or more of the area of the outage cell. Request to the cell base station (S72). That is, the network management apparatus NM10 may request the base station reconfiguration of the base station so that one neighbor cell provided by one neighbor cell base station serves 80% or more of the area of the outage cell. Specifically, the network management device NM10 sets (or changes) antenna configuration information (eg, antenna RF transmission power value, antenna tilt value, and antenna gain value) of one neighboring cell base station, and performs a cell service area (or coverage). ) May request a neighbor cell base station for reconfiguration (for example, antenna reconfiguration based on the set antenna configuration information).

In Table 1, the network management apparatus NM10 displays antenna configuration information (eg, antenna RF transmission power value before compensation, antenna tilt value before compensation, and antenna gain value before compensation) for one selected neighbor cell base station. Register (or save).

After a specific time elapses, the network management apparatus NM10 calculates a base station connection success probability (terminal access success rate) of terminals located in an outage cell region (S73). At this time, if the terminal access success rate is more than the reference value (eg, 80%), the network management device NM10 confirms that the cell compensation function is completed and ends the base station reconfiguration (S74).

If the terminal access success rate is less than the reference value (eg, 80%), the NM10 determines the antenna configuration information (eg, antenna RF transmission power value, antenna tilt value, and antenna gain value of the selected neighboring cell base station). After resetting (e.g., increasing or decreasing), the base station reconfiguration is requested from one neighboring cell base station. The network management device NM10 performs this resetting process, i.e., if the terminal access success rate is less than the reference value (e.g., 80%), the antenna management information of the base station (e.g., antenna RF transmit power value, antenna tilt value, and antenna gain value). The reset process is performed up to two additional times. When the network management device NM10 performs the reset process up to four times, if the terminal access success rate by the four reset processes is less than the reference value (eg, 95%), the antenna configuration information reset four times One neighboring cell base station is requested to perform base station reconfiguration with antenna configuration information (eg, antenna RF transmit power value, antenna tilt value, and antenna gain value) that support the highest terminal access success rate among them. At this time, the network management device NM10 notifies the network operator of the terminal access success rate. For this method, all antenna configuration information (eg, antenna RF transmit power value, antenna tilt value, and antenna gain value) determined in four resetting processes are temporarily stored.

When the network management device NM10 completes the reconfiguration process for compensation of the outage cell (eg, Cell-A), the neighboring cell (eg, one neighboring cell) of the outage cell compensates for the outage cell. Store in Table 3. In addition, the network management device NM10 may perform antenna configuration information of the neighbor cell base station (eg, one neighboring base station) performing the compensation of the outage cell (eg, an antenna RF transmit power value changed for compensation of the outage cell, outage). The antenna tilt value changed for the compensation of the cell and the antenna gain value changed for the compensation of the outage cell) are stored in Table 1.

4. Outage  How to recover neighboring cells that compensated for the area of the cell

When the outage cell is normally restored (ie, restored from the outage state to a normal state), the network management device NM10 returns the neighboring cell (s) that compensated for the outage cell to the state before the outage cell occurred. Restore

In detail, when the network management device NM10 recognizes that the outage cell is normally restored, the network management device NM10 may investigate the neighboring cell (s) (or the compensating base station (s) providing the same) for rewarding the outage cell through Table 3. have. The network management apparatus NM10 may request the base station reconfiguration (eg, antenna reconfiguration) based on Table 1 from the compensation base station (s). For example, the network management device NM10 may include antenna configuration information (eg, antenna RF transmit power value before compensation, antenna tilt value before compensation, and antenna gain before compensation) of the corresponding compensation base station (s) registered in Table 1. Value) can be applied to the corresponding compensation base station (s). That is, the network management device NM10 compensates for the antenna reconfiguration based on the antenna configuration information stored in Table 1 (eg, antenna RF transmission power value before compensation, antenna tilt value before compensation, and antenna gain value before compensation). May make a request to the base station (s). Through this, the peripheral compensation cell (s) can be quickly restored to the state before compensating the outage cell.

8 illustrates a computing device, in accordance with an embodiment of the invention.

The computing device TN100 of FIG. 8 may be a network management device NM10, a base station, a terminal, or the like described herein. Alternatively, the computing device TN100 of FIG. 8 may be a wireless device, a communication node, a transmitter, or a receiver.

In the embodiment of FIG. 8, the computing device TN100 may include at least one processor TN110, a transceiver TN120 connected to a network to perform communication, and a memory TN130. In addition, the computing device TN100 may further include a storage device TN140, an input interface device TN150, an output interface device TN160, and the like. Components included in the computing device TN100 may be connected by a bus TN170 to communicate with each other.

The processor TN110 may execute a program command stored in at least one of the memory TN130 and the storage device TN140. The processor TN110 may refer to a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor on which methods according to an embodiment of the present invention are performed. Processor TN110 may be configured to implement the procedures, functions, and methods described in connection with embodiments of the present invention. The processor TN110 may control each component of the computing device TN100.

Each of the memory TN130 and the storage device TN140 may store various information related to an operation of the processor TN110. Each of the memory TN130 and the storage device TN140 may be configured of at least one of a volatile storage medium and a nonvolatile storage medium. For example, the memory TN130 may be configured as at least one of a read only memory (ROM) and a random access memory (RAM).

The transceiver TN120 may transmit or receive a wired signal or a wireless signal. The computing device TN100 may have a single antenna or multiple antennas.

On the other hand, the embodiment of the present invention is not implemented only through the apparatus and / or method described so far, but may be implemented through a program that realizes a function corresponding to the configuration of the embodiment of the present invention or a recording medium on which the program is recorded. Such implementations can be readily implemented by those skilled in the art from the description of the above-described embodiments.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

Claims (20)

A network management device compensates for an outage cell, the method comprising:
Determining whether a state of a first cell is an outage state in which a terminal belonging to the first cell cannot access the first cell;
When the state of the first cell is an outage state, excluding a cell that is in an energy saving state or that compensates a cell different from the first cell among a plurality of neighboring cells existing around the first cell;
Requesting a plurality of base stations that service the remaining cells other than the excluded cells of the plurality of neighbor cells, the central processing unit (CPU) occupancy of the plurality of base stations;
Determining at least one first base station having a CPU occupancy lower than a first reference value among the plurality of base stations;
Comparing the performance information and the performance reference information of the at least one first base station; And
Selecting at least one compensation cell to participate in the compensation of the first cell among the remaining cells based on the comparison result
Outage cell compensation method of a network management device comprising a. delete The method of claim 1,
The comparing step,
And determining whether the at least one first base station satisfies a condition defined by (performance information of the at least one first base station / the performance reference information) <a second reference value.
Outage cell compensation method of network management device. The method of claim 3,
The performance information of the at least one first base station includes: traffic load of the at least one first base station, number of access terminals of the at least one first base station, and radio frequency (RF) transmission output of the at least one first base station. Including,
The performance reference information includes a maximum traffic load, a maximum number of access terminals, and a maximum RF transmission power,
The condition is the first condition defined as (traffic load / maximum traffic load) <second reference value, the second condition defined as (number of access terminals / maximum access terminal) <second reference value, and (RF transmission output / maximum). RF transmission power) < a second condition defined by the second reference value
Outage cell compensation method of network management device. The method of claim 3,
The step of selecting,
Selecting four cells serviced by the four or more first base stations as compensation cells when the number of the base stations satisfying the condition is four or more among the at least one first base station, and
Two compensation cells of the four compensation cells exist in symmetric positions with respect to the first cell and the other two compensation cells exist in symmetry positions with respect to the first cell.
Outage cell compensation method of network management device. The method of claim 3,
The step of selecting,
Selecting three cells serviced by the three first base stations as compensation cells when the number of the base stations satisfying the condition is three among the at least one first base station; And
Selecting two cells served by the two first base stations as compensation cells when the number of the base stations satisfying the condition is two among the at least one first base station;
Outage cell compensation method of network management device. The method of claim 3,
The step of selecting,
Activating a second cell in an energy saving state among the plurality of neighbor cells when the number of the base stations satisfying the condition among the at least one first base station is one or less;
Requesting, by the base station serving the second cell, performance information of the base station serving the second cell; And
Determining whether the base station serving the second cell has a CPU occupancy less than or equal to the first reference value.
Outage cell compensation method of network management device. The method of claim 3,
The step of selecting,
When the number of the base stations satisfying the condition among the at least one first base station is one, the one first base station is (performance information of the one first base station / the performance reference information) as a third reference value. Determining whether the additional condition defined is satisfied; And
If the one first base station satisfies the additional condition, selecting one cell serviced by the one first base station as a compensation cell,
The third reference value is smaller than the second reference value
Outage cell compensation method of network management device. A network management device compensates for an outage cell, the method comprising:
When the state of the first cell is an outage state in which a terminal belonging to the first cell cannot access the first cell, the first cell of the plurality of neighbor cells existing in the vicinity of the first cell is compensated for. Selecting at least one compensation cell; And
When the number of the at least one compensation cell is four, two of the four compensation cells serve a part of the area of the first cell and the other two compensation cells of the four compensation cells Requesting base station reconfiguration from first base stations providing the four compensation cells to serve the remainder of the area of the first cell;
Outage cell compensation method of a network management device comprising a. The method of claim 9,
Two compensation cells of the four compensation cells exist in symmetric positions with respect to the first cell and the other two compensation cells exist in symmetry positions with respect to the first cell.
Outage cell compensation method of network management device. The method of claim 9,
Requesting the base station reconfiguration from the first base station,
Changing antenna configuration information of the first base stations to expand the area of the four compensation cells; And
Requesting the first base stations for antenna reconfiguration based on the changed antenna configuration information;
The changed antenna configuration information includes a changed antenna radio frequency (RF) transmission output value of the first base stations, a changed antenna tilt value of the first base stations, and a changed antenna gain value of the first base stations. doing
Outage cell compensation method of network management device. The method of claim 11,
Requesting the base station reconfiguration from the first base station,
Storing antenna configuration information set for the first base stations prior to antenna reconfiguration for the first base stations.
Outage cell compensation method of network management device. The method of claim 11,
Requesting the base station reconfiguration from the first base station,
When the base station access success rate of the terminals existing in the region of the first cell is greater than or equal to a first reference value, the four compensation cells compensate for the first cell and store the first compensation for the compensation of the first cell. 1 further comprising storing antenna configuration information set to the base stations;
Outage cell compensation method of network management device. The method of claim 11,
Requesting the base station reconfiguration from the first base station,
When the base station access success rate of the terminals existing in the region of the first cell is smaller than the first reference value, the antenna configuration information of the first base station is changed again and the antenna reconfiguration based on the changed antenna configuration information is performed. Further comprising re-requesting them
Outage cell compensation method of network management device. The method of claim 9,
When the number of the at least one compensation cell is three, the base station reconfiguration to second base stations controlling the three compensation cells such that the three compensation cells serve part or all of the area of the first cell. Steps to request
Outage cell compensation method of the network management device further comprising. The method of claim 15,
Requesting the base station reconfiguration from the second base station,
Changing antenna configuration information of the second base stations based on a relative position of the three compensation cells with respect to the first cell to expand the area of the three compensation cells; And
Requesting the second base stations for antenna reconfiguration based on the changed antenna configuration information.
Outage cell compensation method of network management device. The method of claim 9,
When the number of the at least one compensation cell is two, the antenna configuration information of the second base stations controlling the two compensation cells is changed to extend the area of the two compensation cells and based on the changed antenna configuration information. Requesting the second base stations for antenna reconfiguration
Outage cell compensation method of the network management device further comprising. The method of claim 9,
When the number of the at least one compensation cell is one, whether the second base station controlling the one compensation cell satisfies a condition defined by (performance information / performance reference information of the second base station) <reference value Determining; And
When the second base station satisfies the condition, the antenna configuration information of the second base station is changed to extend the area of the one compensation cell, and the antenna is requested to the second base station based on the changed antenna configuration information. Steps to
Outage cell compensation method of the network management device further comprising. A network management device compensates for an outage cell, the method comprising:
CPUs of a plurality of base stations providing a plurality of neighboring cells in the periphery of the first cell when the state of the first cell is an outage state in which a terminal belonging to the first cell cannot access the first cell. (central processing unit) requesting occupancy;
Determining at least one first base station having a CPU occupancy lower than a first reference value among the plurality of base stations;
Comparing the performance information and the performance reference information of the at least one first base station;
Selecting at least one compensation cell to compensate for the first cell among a plurality of neighbor cells existing around the first cell based on the comparison result;
Storing antenna configuration information of at least one base station providing the at least one compensation cell as first antenna configuration information;
Changing antenna configuration information of the at least one base station to expand the at least one compensation cell; And
Requesting the at least one base station to antenna reconfiguration based on the first antenna configuration information when the first cell is restored from an outage state to a normal state
Outage cell compensation method of a network management device comprising a. The method of claim 19,
The changing step,
Storing the changed antenna configuration information as second antenna configuration information,
The second antenna configuration information includes a modified antenna radio frequency (RF) transmission output value of the at least one base station, a changed antenna tilt value of the at least one base station, and a changed antenna gain of the at least one base station. gain) value
Outage cell compensation method of network management device.

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