KR101632386B1 - Method of controlling overload of base station for IoT, device for controlling overload of base station and device of managing base station - Google Patents

Method of controlling overload of base station for IoT, device for controlling overload of base station and device of managing base station Download PDF

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Publication number
KR101632386B1
KR101632386B1 KR1020150127496A KR20150127496A KR101632386B1 KR 101632386 B1 KR101632386 B1 KR 101632386B1 KR 1020150127496 A KR1020150127496 A KR 1020150127496A KR 20150127496 A KR20150127496 A KR 20150127496A KR 101632386 B1 KR101632386 B1 KR 101632386B1
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South Korea
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base station
coverage
information
overload
load
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KR1020150127496A
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Korean (ko)
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윤병완
김현표
허시영
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주식회사 케이티
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/08—Load balancing or load distribution
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0284—Traffic management, e.g. flow control or congestion control detecting congestion or overload during communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/12—Access point controller devices

Abstract

The present invention relates to an overload control method of an IoT dedicated base station, a load control device of a base station, and a base station management device, which are capable of identifying terminals in an uplink coverage of IoT dedicated base stations providing a unidirectional service in an IoT network, A neighbor node list), and adjusts the reception gain of the base station based on the generated neighbor node list, thereby optimizing the uplink coverage for accommodating the base station.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an overload control method for an IOT dedicated base station, a load control apparatus for a base station, and a base station management apparatus,

The present invention relates to an overload control method for an IOT dedicated base station, a load control apparatus for a base station, and a base station management apparatus, and more particularly, to an apparatus for detecting an over- The present invention relates to a method of controlling an overload of a base station by generating a neighbor node list and optimizing uplink coverage for accommodating a base station by adjusting a reception gain of the base station based on the list.

With the development of information and communication technology (ICT), the majority of devices in the vicinity are changing into a structure in which they are interconnected and interconnected through a communication network. Through this, The Hyper Connected Society, in which objects and objects are connected by a network, is a new connection ecosystem that adds a connection dimension of anything to anytime and anyplace connected worlds. Internet of Things (IoT) is being built.

As IoT becomes a hot topic of ICT industry, investment and attempts to create IoT network are expanding and IoT network operators are emerging in developed countries. For example, IoT network operators such as Sigfox, LoRa Alliance and Weightless appeared in France, Spain, Netherlands, UK and USA. In particular, in the IoT network type shown in FIG. 1, , And ZigBee. However, in recent years, a small power using the UNB (Ultra Narrow Band) technology, a low power Wide Area Network (LPWAN) ), The construction of dedicated IoT communication network is becoming a hot topic.

The UNB communication technology uses a relatively narrow band as compared with other communication methods as seen in the frequency band of FIG. 2 as a communication technique using the narrow band as the name implies. This allows the noise floor to be very low, allowing a relatively small amount of data to be transmitted over a fairly long distance with very little power, and connecting a very large number of nodes to the MP2P (Multi Point to Point) scheme . Due to these characteristics, UNB communication technology is attracting attention as it meets the requirements of IoT application field.

However, UNB communication technology supports unidirectional communication because bandwidth is very narrow. In other words, it is possible to send data from a small node to a base station. However, it may be bidirectional depending on how the channel bandwidth is set, but considering the bandwidth for node reception, it is suitable for a unidirectional uplink Do.

In particular, since the UNB communication technology is a unidirectional service, there is a limitation in managing the terminals accommodated in the base station because there is no way to provide the terminal with the load status of the base station, which makes it difficult to control the overload of the base station. In addition, if the base station is overloaded due to such a problem, the service for the terminal is disconnected.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems of the prior art and it is an object of the present invention to provide a method for providing a load status of a base station to a terminal in an IoT network for providing a unidirectional service, .

In particular, in order to provide a unidirectional service, it is difficult to control the overload of the base station because it is difficult to appropriately adjust the receiving terminals in the base station, and the problem of disconnecting the service due to the overload of the base station is solved .

According to an aspect of the present invention, there is provided an overload control method for an IOT dedicated base station, the method comprising: detecting a terminal in an uplink coverage for a plurality of IoT dedicated base stations providing an uplink unidirectional service; A neighbor node list generation step of generating a neighbor node list including terminal list information of each base station and determining a redundancy of each terminal based on the neighbor list; The base station management apparatus comprising: a base station overload determination step of determining overload of the base station; And the base station management apparatus may include a base station coverage adjustment step of adjusting uplink coverage through adjustment of a reception gain for at least one base station based on the neighbor node list and the redundancy.

Preferably, the mobile terminal further includes a terminal information collecting step of receiving coverage information including terminal information on a terminal in uplink coverage from a load control device of each base station, wherein the neighboring node list generating step includes: The neighbor node list is generated based on the coverage information, and the redundancy for the terminal can be grasped.

Herein, the base station overload determination step determines the number of terminals existing within the uplink coverage of the base station based on the coverage information, and determines the number of terminals existing in the uplink coverage of the base station based on the first determination result, Overload can be judged.

In addition, the base station overload determination step may include a step of comparing a frequency utilization rate of the base station with a frequency utilization rate reference value or a CPU load applied to the base station from a load control apparatus installed in the base station, One or more of the third determination results may be received, and the overload of the base station may be determined based on the determination result.

In addition, the base station coverage adjustment step transmits gain control information for controlling the load control device of the overloaded base station to lower the reception gain based on the neighbor node list and the redundancy, You can adjust to reduce coverage.

Determining a free base station to determine a free base station associated with the overloaded base station based on the neighbor node list and the redundancy; And a control information transmitting step of transmitting gain control information for controlling the load control device of the overloaded base station so as to lower the receiving gain and transmitting gain control information for controlling the load control device of the spare base station to increase the receiving gain can do.

More preferably, the neighbor node list generation step generates a list of neighboring nodes including received signal strength indication (RSSI) information of each terminal for each base station, and the step of determining a spare base station comprises: The redundant base station can be selected based on the RSSI of the terminals included and the redundancy of the terminals.

Further, the base station coverage adjustment step may control the reception gain of the overloaded base station or the spare base station to be adjusted in units of a predetermined level by the load control device of the overloaded base station or the load control device of the spare base station.

Further comprising the step of the base station management apparatus receiving the base coverage adjustment information from the load control apparatus of the base station, and updating the neighbor node list by re-executing the neighbor node list generation step.

The overload control method for an IoT dedicated base station according to the present invention is characterized in that a load control device of an IoT dedicated base station for providing an uplink unidirectional service transmits coverage information including terminal information for a terminal in uplink coverage to a base station management device A coverage information transmission step; A base station overload determination step of the load control device determining an overload to the base station; A base station coverage adjustment step of adjusting the uplink coverage through adjustment of a reception gain for the base station; And a coverage information transmission step in which the load control apparatus transmits coverage adjustment information to the base station management apparatus, wherein the base station management apparatus transmits the coverage information to the base station management apparatus via the base station management apparatus based on the coverage information and the coverage adjustment information. An overload for the IoT dedicated base station can be managed.

Preferably, the base station overload determination step determines whether or not the load control device compares a frequency utilization rate of the base station with a frequency utilization rate reference value or a CPU load applied to the base station, And determine an overload for the base station based on at least one of the third determination result.

More preferably, the load control apparatus further includes an overload determination result transmission step of transmitting at least one of the second determination result and the third determination result to the base station management apparatus, wherein the base station coverage adjustment step comprises: A gain control information receiving step of receiving a gain control information for controlling the load control device to lower the reception gain from the base station management device; And the load control apparatus may include a coverage adjustment step of reducing the reception gain of the base station and reducing the uplink coverage.

Further, the base station coverage adjustment step may include: a gain control information reception step of receiving the gain control information for controlling the load control device to increase the reception gain from the base station management device; And the load control apparatus may include a coverage adjustment step of increasing the reception gain of the base station to widen the uplink coverage.

Here, the base station coverage adjustment step may adjust the uplink coverage by adjusting the reception gain for the base station by the load control unit on a predetermined level basis.

The load control apparatus of the base station dedicated to IoT according to the present invention includes a coverage determination unit installed in an IoT dedicated base station for providing an uplink unidirectional service and recognizing terminal information located within the uplink coverage of the base station and generating coverage information, ; An overload management unit for determining an overload for the base station; A gain controller for adjusting uplink coverage by adjusting a reception gain of the base station; And a base station management apparatus interworking unit for providing the coverage information to an external base station management apparatus and receiving gain control information for controlling the reception gain from the base station management apparatus.

Preferably, the overload management unit includes: a frequency utilization rate measurement unit that measures frequency utilization rate of the base station; A CPU load measuring unit for measuring a CPU load given to the CPU of the base station; And an overload determination unit for determining an overload of the base station based on at least one of the frequency utilization rate and the CPU load.

In addition, the base station management apparatus according to the present invention may be configured to operate in cooperation with a load control apparatus provided in each of a plurality of IoT dedicated base stations for providing uplink unidirectional services, Wherein the control unit determines the redundancy of each base station based on the neighboring node list and adjusts the uplink coverage through the control of the reception gain of the base station based on the neighboring node list and the redundancy, Can be managed.

A neighbor node list management unit for identifying a terminal in uplink coverage for each of a plurality of IOT dedicated base stations for providing uplink unidirectional services and generating a neighbor list including terminal list information for each base station; A base station load monitoring unit for determining whether the base station is overloaded based on the neighboring node list; A base station management unit for generating reception gain information for adjusting an uplink coverage of the base station through a load controller of the base station; And a load control unit interlocking unit for receiving the coverage information or the coverage adjustment information from the load control unit of the base station and transmitting the gain control information for controlling the uplink coverage to the load control unit of the base station.

Furthermore, the base station load monitoring unit may determine the number of terminals existing in the uplink coverage of the base station based on the neighboring node list, and determine an overload for the base station based on a first determination result, It can be judged.

The base station load monitoring unit may further include a second determination unit that compares the frequency utilization rate of the base station with the frequency utilization rate reference value or the CPU load applied to the base station from the load control unit of the base station, One or more of the third determination results may be received, and the overload of the base station may be determined based on the determination result.

According to the present invention, the overhead of the base station is managed by optimally adjusting the coverage of the base station in consideration of the redundancy between the neighbor base stations through the base station management apparatus managing the base stations dedicated to IoT for providing the unidirectional service, Can be prevented.

In particular, the base station management apparatus generates and manages a list of neighboring nodes for the terminals existing in the coverage of each base station, adjusts the coverage by adjusting the reception gain between the base stations according to the redundancy of the terminals through the neighboring node list, IoT network.

In addition, by applying the neighbor node list, it is possible to maintain proper redundancy while lowering the density of the base stations on the IoT network, thereby optimizing the operation of the IoT network and the battery consumption of the terminal.

1 shows various communication methods applied to an IO network,
2 shows frequency bands of various communication methods applied to the IoT network,
3 shows a configuration diagram of an embodiment of an IoT dedicated base station management system to which the present invention is applied,
4 shows a configuration diagram of an embodiment of a load control apparatus for a base station dedicated to IoT according to the present invention,
5 shows a configuration diagram of an embodiment of an overload management unit of a load control apparatus according to the present invention,
6 is a block diagram of an embodiment of a base station management apparatus for managing an overload of an IoT dedicated base station according to the present invention,
7 shows a flowchart of an embodiment of an overload control method for an IoT dedicated base station according to the present invention,
FIG. 8 shows an embodiment of coverage information for each base station in the overload control method of the base station dedicated to IoT according to the present invention,
9 shows an embodiment of a list of neighboring nodes used in an overload control method of an IoT dedicated base station according to the present invention,
FIG. 10 is a flowchart illustrating an operation of a base station management apparatus in an overload control method for an IoT dedicated base station according to the present invention,
11 is a flowchart of an embodiment of a load control apparatus in an overload control method for an IoT dedicated base station according to the present invention
FIG. 12 illustrates an embodiment of overload management of a base station by applying an overload control method for an IoT dedicated base station according to the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.

First, the terminology used in the present application is used only to describe a specific embodiment, and is not intended to limit the present invention, and the singular expressions may include plural expressions unless the context clearly indicates otherwise. Also, in this application, the terms "comprise", "having", and the like are intended to specify that there are stated features, integers, steps, operations, elements, parts or combinations thereof, But do not preclude the presence or addition of features, numbers, steps, operations, components, parts, or combinations thereof.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

The present invention relates to a method for managing overloads of base stations providing uni-directional services in an IoT network, comprising: generating a neighbor node list by identifying terminals in an uplink coverage of the base stations; And controls the overload of the base station by adjusting the reception gain of the base station to optimize the uplink coverage for accommodating the base station.

As a unidirectional service of the IoT network to which the present invention is applied, a scheme of providing an unidirectional service (Uplink Only) by applying an UNB (Ultra Narrow Band) technology to an IoT network has been proposed. There is a problem that can not be confirmed whether the signal transmission is successful because it is not supported.

Therefore, in case of unidirectional service, SigFox solution or the like provides base station redundancy because it can not confirm the signal transmission. Redundancy means that other base stations receive the same signal in addition to the base station providing the uplink transmission, and the transmission success rate is improved by using the same.

In the unidirectional service, there is a method of increasing the number of transmissions in order to increase the transmission success rate. However, since it is directly connected to the battery consumption of the IoT terminal, continuous retransmission is not appropriate and the transmission success rate is increased by increasing the redundancy of the base station. That is, increasing the redundancy increases the number of base stations with overlapping coverage by decreasing the interval between the base stations. By increasing the number of base stations, the number of base stations receiving the uplink signals of the terminals increases and the transmission success rate increases.

However, even though there are fewer terminals than the number of base stations, the number of base stations having overlapping coverage increases so that each base station quickly reaches the maximum terminal reception value, which causes an overload to be easily generated in the base station.

Therefore, the present invention proposes a method of solving the problem of shortening the service provision to the terminal by increasing the transmission success rate through the redundancy and simultaneously reaching the overload of the base station.

FIG. 3 shows a configuration diagram of an embodiment of an IoT dedicated base station management system to which the present invention is applied.

Each of the base stations 100a, 100b, and 100c included in the IoT network and providing a unidirectional service supports the IoT service by receiving the IoT terminal according to the uplink coverage. In the present invention, the base stations 100a, 100b, And a base station management apparatus 200 that manages the base stations 100a, 100b, and 100c in cooperation with the load control apparatus and manages the overload of the base stations, thereby providing a stable IoT network .

For example, when too many terminals are accommodated in the uplink coverage 101 of a certain base station 100a and the base station 100a is overloaded, the load control device of the base station 100a and the base station management device 200 interlock with each other, Thereby reducing the overhead of the base station 100a through the reduced uplink coverage 103 by reducing the uplink coverage of the base station 100a.

When the load on the other base stations 100b and 100c is overloaded and the uplink coverage of the corresponding base station is reduced, the load control device of the adjacent base station 100a and the base station management device 200 ) To widen the uplink coverage of the base station 100a to prevent service disconnection of the terminal through the widened uplink coverage 105. [

In order to provide a stable unidirectional service in which overload of the base station is controlled and service disconnection does not occur to the terminal,

And applies the neighbor node list as a list of terminals existing within the uplink coverage of the stations to adjust the uplink coverage of the base station based on the list.

The IoT dedicated base station management system according to the present invention includes a base station management apparatus for managing a load control apparatus provided in each base station and a base station constituting the IoT network as a whole. .

4 shows a configuration diagram of an embodiment of a load control apparatus for a base station dedicated to IoT according to the present invention.

Hereinafter, the base station and the load control device will be described with the same identification numbers for convenience of explanation.

The load control device 100 may be included in the devices of the base station as part of the base station device, or may be configured to operate in a position adjacent to the base station device.

The load control apparatus 100 may include a coverage determination unit 110, an overload management unit 130, a gain control unit 150, and a base station management apparatus interlocking unit 170.

The coverage determination unit 110 determines the terminal information existing in the uplink coverage of the base station through each configuration included in the base station and generates coverage information based on the information. For example, the base station can collect the identification information of the terminal to which the uplink signal is transmitted, the RSSI information, and the reception gain information of the base station itself to generate coverage information including terminal information and reception gain information.

The overload management unit 130 determines whether or not an overload of the base station occurs. The overload of the base station can be measured based on the frequency utilization rate, the CPU load, and the like. In addition, various over- .

The gain control unit 150 adjusts the reception gain of the base station to adjust the uplink coverage. The gain control unit 150 may adjust the reception gain according to whether the base station is overloaded or not, which is determined by the overload management unit 130, The receiving gain may be adjusted according to the control information.

The gain control unit 150 may simply reduce the reception gain to reduce the uplink coverage as well as increase the reception gain to increase the uplink coverage. For example, if the base station is an overloaded base station, the reception control unit 150 decreases the reception gain to reduce uplink coverage, In the case of a spare base station, the uplink coverage can be widened by increasing the reception gain. At this time, the adjustment of the reception gain can be adjusted in a predetermined level unit.

The base station management apparatus interworking unit 170 transmits the management information of the external base station management device and the base station, for example, provides the coverage information to the base station management device, receives the gain control information for controlling the reception gain from the base station management device . The base station management apparatus interworking unit 170 and the external base station management apparatus can be connected through various wired / wireless communication networks, and data transmission can be performed, for example, through a pre-established Internet network.

5 is a block diagram of an embodiment of an overload management unit of a load control apparatus for a base station dedicated to IoT according to the present invention, as an embodiment of the overload management unit 130 of the load control apparatus according to the present invention.

The overload management unit 130 may include a frequency utilization rate measurement unit 131, a CPU load measurement unit 133, an overload determination unit 135, and the like.

The frequency utilization measuring unit 131 measures the frequency spectrum utilization rate. Since the UE uses the frequency randomly due to the characteristics of the uplink service and transmits the uplink in a situation where the signal synchronization is incompatible, May overlap with or cause interference with signals from other terminals. Accordingly, in the present invention, the frequency utilization rate measuring unit 131 is provided to reduce the interference between the uplink signals by maintaining an appropriate level of spectrum utilization rate to increase the efficiency of the uplink service, thereby measuring the frequency utilization rate according to the same frequency usage during the same time period.

The CPU load measuring unit 133 measures the load given to the CPU provided in the base station. When the uplink signal is transmitted from a plurality of terminals to the base station, the CPU load measuring unit 133 measures the load In order to provide the link service, it is necessary to keep the CPU load constantly below a certain level. Therefore, in the present invention, the CPU load measurement unit 133 is provided to measure the load on the CPU of the base station.

The overload management unit 135 determines whether or not the base station is overloaded in consideration of the frequency usage rate and the CPU load. For example, the overload management unit 135 may compare the frequency usage rate measured by the frequency usage rate measurement unit 131 with the frequency usage rate A third determination result as to whether or not the base station is overloaded with respect to the CPU load with respect to the predetermined CPU load reference value as a result of the third determination .

The gain controller 150 of the load controller 100 adjusts the gain of the base station to adjust the uplink coverage based on the determination result of the overload management unit 130 of the load controller 100.

The determination result of the overload management unit 130 of the load control apparatus 100 may be transmitted to an external base station management apparatus and may be determined by the base station management apparatus in consideration of the relationship with other base stations .

FIG. 6 is a block diagram of an embodiment of an IOT-dedicated base station management apparatus according to the present invention. The base station management apparatus manages base stations included in the IoT network in cooperation with the load control apparatus 100 as described above.

The base station management apparatus 200 may include a neighbor node list management unit 210, a base station load monitoring unit 230, a base station management unit 250, a load control unit interface unit 270, and the like.

The neighbor node list management unit 210 receives a neighbor node list including UE list information included in the uplink coverage of each base station based on the coverage information transmitted from the load control apparatuses of the base stations included in the IoT network Create and manage. The coverage information may include identification information of a terminal existing within the coverage of the base station, RSSI information, reception gain information of the base station itself, and the like.

The coverage information transmitted from the load control device of each base station includes terminal information such as terminal identification information and RSSI information of terminals existing in the uplink coverage of each base station. And generates a neighbor list as a list of the terminals located within the coverage of the base stations located in a certain area or the entire IoT network.

The load control device of each base station transmits the coverage adjustment information after the coverage adjustment of the corresponding base station, and the neighboring node list management unit 210 updates the neighboring node list based on the coverage adjustment information.

The base station load monitoring unit 230 determines whether an overload has occurred in a specific base station based on the neighboring node list generated by the neighboring node list management unit 210. The base station load monitoring unit 230 may determine, And determines an overload for the base station based on the first determination result in comparison with the access terminal reference value of the base station.

In addition, the base station load monitoring unit 230 may determine the overload of the corresponding base station based on the frequency utilization rate of the base station or the determination result of the CPU load transmitted from the load control device of each base station.

The base station management unit 250 adjusts the coverage of each base station in cooperation with the load control device of each base station. Based on the determination result of the base station load monitoring unit 230, Gain control information for adjusting the gain control information to be decreased.

Also, the base station management unit 250 may generate and transmit gain control information for adjusting the coverage of the spare base station so that the coverage of the spare base station can be increased by grasping the spare base station among adjacent base stations based on the neighboring node residence when adjusting the coverage of the overloaded base station.

Further, the base station management unit 250 grasps the redundancy of the mobile stations based on the neighboring node list, and when there is a mobile station having a lower redundancy than the reference value, the base station management unit 250 grasps a spare base station capable of accommodating the mobile station, Gain control information for adjustment may be generated and transmitted.

The load controller interworking unit 270 receives the coverage information or the coverage adjustment information for the base stations in cooperation with the load controllers of the respective base stations included in the IoT network and controls the load controller of the corresponding base station to perform gain control And transmits information.

As described above, according to the present invention, a base station management apparatus that includes a load control apparatus for each base station and manages overload of the base stations included in the IoT network is installed, and the base station management apparatus interworks with the load control apparatus, The overhead of the base station can be managed by adjusting the coverage of the base station in consideration of the redundancy.

In the present invention, an overload control method of a base station dedicated to IoT is shown through the above-described base station load control device and base station management device. Hereinafter, an overload control method for a base station dedicated to IoT according to the present invention will be described with reference to FIG. do.

FIG. 7 shows a flowchart of an embodiment of an overload control method for an IoT dedicated base station according to the present invention.

The base station management apparatus 200 receives and collects coverage information of each base station from the load control apparatuses 100a and 100b of each base station. Here, the coverage information includes terminal information located in the coverage of the base station, reception gain information of the base station, .

The base station management apparatus 200 generates a neighboring node list based on various terminal information included in the collected coverage information (S120) and stores the neighboring node list. The neighboring node list includes a coverage list, Create a list. The redundancy of each terminal can be grasped based on the list of neighboring nodes, and the redundancy relation between the base stations can be determined.

In the overhead control method of the base station for IoT dedicated to the present invention shown in FIG. 8, the process of generating the list of neighboring nodes based on the collected terminal information for each base station and grasping the redundancy for each terminal based on the list is described. An embodiment of the present invention will be described with reference to an embodiment of a list of neighboring nodes used in the overload control method of the base station for IoT dedicated to the present invention shown in FIG.

The load control devices 100a, 100b, and 100c of the base stations illustrated in FIG. 8 generate coverage information by identifying the terminals that are present in the coverage of the base station. For example, in the case of one terminal 10a in FIG. 8, All the load control devices 100a, 100b, and 100c of the three base stations collectively collect the terminal information of one terminal 10a because they are all included in the coverage of the three base stations 100a, 100b, and 100c. The terminal information collected at this time may also collect RSSI information, which is the signal range 11a of the terminal 10a, in addition to the terminal identification information.

In the case of the other terminal 10b, only one base station 100a is included in the coverage, and only one base station load control apparatus 100a collects terminal information for the other terminal 10b.

Thus, the load control devices 100a, 100b, and 100c provided in each base station collect terminal information about terminals existing within the coverage of the corresponding base station, generate coverage information, and transmit the generated coverage information to the base station management device.

In this case, the coverage information transmitted to the base station management apparatus may include reception gain information of each base station.

The base station management apparatus 200 collects coverage information for base stations or all base stations in a certain area included in the IoT network and synthesizes the coverage information to generate a list of neighboring nodes, which is a terminal list of each base station. 310b, and 310c, the coverage information including the terminal identification information and the RSSI information, as shown in FIG.

As shown in FIG. 9B, the base station management apparatus 200 can generate a redundancy table 320 based on the generated neighboring node list 310 by detecting the redundancy for each terminal.

The redundancy table 320 includes each terminal list 321 and redundancy information 323 matched to each terminal. For example, the terminal with the identification number 001 may include the terminal list 310a of the base station # 1 on the neighbor node list 310 And the terminal list 310c of the base station # 3, there is one spare base station in addition to the base station that receives and processes the uplink signal of its own, so that the redundancy of the identification number 001 is 1. In the case of the terminal having the identification number 003, since it is included in the terminal lists 310a, 310b and 310c of the base station # 1, the base station # 2 and the base station # 3 on the neighbor node list 310, In addition to the base station, there are two spare base stations, and the redundancy of the identification number 003 terminal is 2.

In addition, the redundancy table 320 may include base station information 325 having a coverage including each terminal, in addition to the redundancy information for each terminal, for each terminal.

As described above, according to the present invention, the base station management apparatus 200 easily generates a list of neighboring nodes based on the coverage information of the base stations included in the IoT network, and thereby easily grasps the redundancy of each terminal.

7, the overload control method of the base station dedicated to IoT according to the present invention will be described.

The base station management apparatus 200 generates a list of neighboring nodes (S120) and stores the neighbor list. Each base station determines whether the load is overloaded. For example, the load control apparatus 100a of the base station A determines whether the base station A is overloaded (S130) If it is determined that the base station A is overloaded, the determination result is transmitted to the base station management apparatus 200 (S140). At this time, the load controller 100a of the base station A may reduce the coverage by adjusting the reception gain of the base station A and transmit the corresponding coverage adjustment information to the base station management apparatus 200. In the embodiment of FIG. 7, It is assumed that the load control apparatus 100a only transmits a determination result to the base station management apparatus 200 that the load control apparatus 100a determines that the base station A is overloaded.

The base station management apparatus 200 determines the overloaded base station among the base stations included in the IOT network by summing up the determination results transmitted from the load control apparatus 100a of the overloaded base station (S150) And transmits the gain control information for controlling the device 100a to lower the reception gain (S170a). At this time, the gain control information may be information for controlling the reception gain to be lowered in units of a predetermined level.

Then, the load control apparatus 100a of the base station A reduces the reception gain of the base station A based on the gain control information from the base station management apparatus 200, thereby reducing the coverage of the base station A.

Further, the base station management apparatus 200 determines the free base station associated with the overloaded base station A so that the unidirectional service for the terminals existing in the coverage of the base station A determined as the overloaded base station is not disconnected, .

7, the base station management apparatus 200 determines a base station associated with the base station A, which is determined to be an overloaded base station, based on the list of neighboring nodes, and determines an available base station (S160).

At this time, by reducing the coverage of the base station A based on the RSSI information of the mobile stations existing in the coverage of the base station A determined to be the overloaded base station, it is possible to identify the base station that can include the mobile station deviating from the coverage of the base station A, It is possible to select a base station having a small number of terminals as a spare base station.

The base station management apparatus 200 transmits gain control information to the spare base station so as to increase the coverage gain of the spare base station. In FIG. 7, if the base station B is identified as the spare base station associated with the base station A, The gain control information for controlling the load control device 100b to increase the reception gain of the base station B and widen the coverage is transmitted (S170b).

The load control apparatus 100a of the base station A determined as an overloaded base station according to the gain control information of the base station management apparatus 200 adjusts reception gain so as to reduce the coverage by lowering the reception gain (S180a) The load controller 100b of the base station B adjusts the reception gain so as to increase the reception gain and widen the coverage (S180b).

The operation of the base station management apparatus and the operation of the load control apparatus of the base station with respect to the overload control method of the base station dedicated to IoT according to the present invention will be described in more detail with reference to the respective embodiments.

FIG. 10 is a flowchart illustrating an operation of the base station management apparatus in an overload control method for an IoT dedicated base station according to the present invention.

The base station management apparatus 200 receives the coverage information from the load control apparatuses of the respective base stations (S210) and synthesizes the collected coverage information of the base stations to generate or update the neighboring node list (S220). At this time, if the BS management apparatus 200 has a list of neighbor nodes for the BSs included in the IoT network, it may update the neighbor node list by receiving the coverage information of the newly added BS, The neighboring node list may be updated by receiving the coverage adjustment information (S215).

The base station management apparatus 200 determines the redundancy of each terminal on the basis of the list of neighboring nodes. Referring to FIG. 9, a process of generating a list of neighboring nodes and determining the redundancy of the terminals based on the list is described. .

If there is a terminal that is less than the reference value in the identified redundancy for each terminal, the base station management apparatus 200 determines a spare base station capable of extending the coverage to include the corresponding terminal on the basis of the list of neighboring nodes to increase the redundancy of the corresponding terminal (S280) The coverage can be widened by adjusting the reception gain of the spare base station and the corresponding terminal can be included in the coverage of the spare base station, thereby increasing the redundancy of the corresponding terminal.

That is, as described above, in the case of the unidirectional service, the transmission success rate can be increased by increasing the redundancy. In the present invention, the redundancy of the terminal can be increased by adjusting the coverage of the base station based on the neighbor node list.

Then, the base station management apparatus 200 determines the number of terminals existing within the coverage of each base station based on the neighboring node list, and generates a first determination result as to whether or not the base station is overloaded in comparison with the access terminal reference value of the base station S260). Here, the access terminal reference value of the corresponding base station may be set considering the operating state of the corresponding base station, the installed position, etc., and may be selectively changed by the administrator.

In addition, the base station management apparatus 200 may receive the second determination result and the third determination result as to whether or not the base station's load controller has determined that the base station is overloaded (S265) And the third determination result may be an overload according to the CPU load of the base station determined by the load controller of the base station.

The base station management apparatus 200 determines whether the base station is overloaded (S270) based on the first determination result, the second determination result, the third determination result, and the like, and determines whether any one of the determination results is an overloaded base station The base station may be determined to be an overloaded base station, or the base station may be determined to be an overloaded base station if all the determination results are determined to be an overloaded base station.

When the overloaded base station occurs, the base station management device 200 transmits gain control information for reducing the coverage to the load control device of the base station determined to be the overloaded base station by reducing the reception gain (S290).

In addition, the base station management apparatus 200 determines a spare base station associated with the base station determined to be an overloaded base station (S280), and transmits the gain control information for increasing the coverage gain to the load control device of the base station determined to be the free base station, (S290).

11 is a flowchart of an embodiment of a load control apparatus in an overload control method for an IoT dedicated base station according to the present invention.

11, the load controller 100 of the base station collects identification information, RSSI information, reception gain information of the base station itself, and the like, to which the uplink signal is transmitted to the base station, And transmits the coverage information to the base station management apparatus. The transmission of the coverage information of the load control apparatus 100 may be performed first in the process of FIG. 11, The coverage information may be transmitted.

The load control apparatus 100 of the base station measures the frequency use rate according to the frequency use of the base station (S310), compares the frequency use rate of the base station with the frequency use rate reference value, and determines whether the base station is overloaded according to the frequency use rate (S320).

In addition, the load control device 100 of the base station measures the CPU load given to the base station (S330), and generates a third determination result of comparing the measured CPU load with the CPU load reference value to determine whether the base station is overloaded according to the CPU load (S340).

The process of generating the second determination result and the third determination result may be performed simultaneously or one of the processes may be performed as needed.

Then, the load controller 100 of the base station adjusts the reception gain of the base station by combining the second determination result and the third determination result (S360). At this time, even if any of the second determination result and the third determination result is overloaded It is possible to adjust the reception gain or to adjust the reception gain when it is determined that both the second determination result and the third determination result are overloaded.

If it is determined that the base station is overloaded, the load control apparatus 100 of the base station may reduce the coverage by lowering the reception gain of the base station itself, or may transmit the second determination result and the third determination result to the base station management apparatus, The gain control information from the device may be received (S350), and the reception gain may be lowered according to the gain control information to reduce the coverage. At this time, the reception gain can be adjusted by a predetermined level unit.

After adjusting the coverage of the base station, the load controller 100 of the base station generates coverage adjustment information for the adjusted coverage and transmits it to the base station management apparatus (S370). The coverage adjustment information may optionally include adjusted gain gain information or terminal information present in the adjusted coverage.

When the gain control information is received, the load control apparatus 100 of the base station receives the gain control information for increasing the coverage of the base station from the base station management apparatus, The coverage can be increased by increasing the gain, and the coverage adjustment information according to the adjusted coverage is transmitted to the base station management apparatus (S370).

An example of managing the overload of the base station according to the overload control method of the base station dedicated to IoT according to the present invention will be described with reference to FIG.

12A shows a case where the base station A 400a is determined to be an overloaded base station, and the load control device of the base station A receives the gain control information from the base station A 400a according to its own reception gain adjustment or gain control information from the base station management device, The coverage A of the base station A is reduced and the reduced coverage 430a of the base station A causes the terminal 20 to be out of coverage of the base station A and the number of terminals existing in the coverage of the base station A is reduced, A overload is solved.

12B shows a case where the base station A 400a is determined to be an overloaded base station as shown in FIG. 12A. The coverage 430a of the base station A 400a is reduced to reduce the coverage 430a Thereby overloading the base station A 400a. 12B, the receiving gain of the base station B 400b is increased as a spare base station capable of accommodating the terminal 20 out of the coverage of the base station A 400a, as shown in FIG. 12B. To extend coverage 410b. The terminal 20 is included in the extended coverage 430b of the base station B 400b so that the overhead of the base station can be managed while maintaining the redundancy of the terminal.

12C illustrates a case where the redundancy is adjusted in order to increase the transmission success rate of the terminal 20. The redundancy of the terminal 20 is included in the coverage of the base station A 400a, It is possible to increase the redundancy of the terminal by accommodating the terminal in the extended coverage 430b by expanding the coverage 410b of the base station B 400b as a spare base station accommodating the terminal 20 when the terminal is low.

According to the present invention, the overhead of the base station can be managed by optimally adjusting the coverage of the base station in consideration of the redundancy between the neighbor base stations through the base station management apparatus managing the base stations dedicated to IoT for providing the unidirectional service, It is possible to prevent disconnection.

In particular, the base station management apparatus generates and manages a list of neighboring nodes for the terminals existing in the coverage of each base station, adjusts the coverage by adjusting the reception gain between the base stations according to the redundancy of the terminals through the neighboring node list, IoT network.

In addition, by applying the neighbor node list, it is possible to maintain proper redundancy while lowering the density of the base stations on the IoT network, thereby optimizing the operation of the IoT network and the battery consumption of the terminal.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments of the present invention are not intended to limit the scope of the present invention but to limit the scope of the present invention. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents thereof should be construed as being included in the scope of the present invention.

10a, 10b, 20: terminal,
100, 100a, 100b, 100c: a load control device of a base station,
110: a coverage determination unit,
130: Overload management unit,
131: frequency utilization measuring part,
133: CPU load measuring part,
135: Overload judging unit,
150: gain control unit,
170: base station management apparatus interlocking section,
200: base station management device,
210: neighbor node list management unit,
230: base station load monitoring unit,
250: base station management unit,
270: Interlocking part of load control device.

Claims (20)

The base station management apparatus identifies the terminals in the uplink coverage for each of the plurality of IoT dedicated base stations providing the uplink unidirectional service and generates a neighbor node list including the terminal list information for each base station A neighbor node list generation step of determining a redundancy of each terminal based on the neighbor node list;
The base station management apparatus comprising: a base station overload determination step of determining overload of the base station; And
Wherein the base station management apparatus includes a base station coverage adjustment step of adjusting uplink coverage through adjustment of a reception gain for at least one base station based on the neighbor node list and the redundancy. A method for overload control of a base station. The method according to claim 1,
Further comprising: a terminal information collecting step of receiving, from a load control device of each base station, coverage information including terminal information for a terminal in uplink coverage,
Wherein the neighbor node list generation step comprises:
Generating a list of neighboring nodes based on coverage information collected for each base station, and detecting redundancy for the terminal. 3. The method of claim 2,
In the base station overload determination step,
The base station determines the overload for the base station based on the first determination result in comparison with the base station access terminal reference value of the base station, by determining the number of terminals existing in the uplink coverage of the base station based on the coverage information, IoT dedicated base station overload control method. 4. The method according to any one of claims 1 to 3,
In the base station overload determination step,
A second determination result in which a frequency utilization rate of the base station is compared with a frequency utilization rate reference value or a third determination result in which a CPU load assigned to the base station is compared with a CPU load reference value, And an overload for the base station is determined based on the determination result. The method according to claim 1,
The base station coverage adjustment step includes:
The gain control information for controlling the load control device of the overloaded base station to reduce the reception gain is transmitted based on the neighbor node list and the redundancy so as to reduce the uplink coverage through the load control device of the overloaded base station Of the IoT dedicated base station. 6. The method of claim 5,
The base station coverage adjustment step includes:
Determining a spare base station associated with the overloaded base station based on the neighbor node list and the redundancy; And
And a control information transmitting step of transmitting gain control information for controlling the load control device of the overloaded base station so as to lower the receiving gain and transmitting gain control information for controlling the load control device of the spare base station to increase the receiving gain And the overload control method of the base station dedicated to IoT. The method according to claim 6,
Wherein the neighbor node list generation step comprises:
Generates a list of neighboring nodes including received signal strength indication (RSSI) information of each terminal for each base station,
The redundant base station determination step may include:
Wherein the redundant base station is selected based on the RSSIs of the terminals included in the uplink coverage of the overloaded base station and the redundancy of the terminals. The method according to claim 6,
The base station coverage adjustment step includes:
Wherein the control unit controls the load control unit of the overloaded base station or the load control unit of the spare base station to adjust the reception gain of the overloaded base station or the spare base station in units of a predetermined level. The method according to claim 1,
The base station management apparatus further comprises receiving the base station coverage adjustment information from a load control apparatus of the base station,
And updating the neighboring node list by re-executing the neighboring node list generating step. A coverage information transmission step in which a load control apparatus of an IoT dedicated base station providing an uplink unidirectional service transmits coverage information including terminal information for a terminal in uplink coverage to a base station management apparatus;
A base station overload determination step of the load control device determining an overload to the base station;
A base station coverage adjustment step of adjusting the uplink coverage through adjustment of a reception gain for the base station; And
And the load control device transmits the coverage information to the base station management device,
Wherein the overload of the plurality of IoT dedicated base stations including the base station is managed through the base station management apparatus based on the coverage information and the coverage adjustment information. 11. The method of claim 10,
In the base station overload determination step,
The load control apparatus may further include a second determination result in which the frequency utilization rate of the base station is compared with a frequency utilization rate reference value or a third determination result in which a CPU load assigned to the base station is compared with a CPU load reference value And determining an overload for the base station. 12. The method of claim 11,
And the overload determination result transmission step in which the load control device transmits at least one of the second determination result and the third determination result to the base station management apparatus,
The base station coverage adjustment step includes:
A gain control information receiving step of receiving the gain control information for controlling the load control device to lower the reception gain from the base station management device; And
Wherein the load control device includes a coverage adjustment step of reducing a reception gain of the base station and reducing an uplink coverage. 11. The method of claim 10,
The base station coverage adjustment step includes:
A gain control information receiving step of receiving the gain control information for controlling the load control device to increase the reception gain from the base station management device; And
Wherein the load control device includes a coverage adjustment step of increasing a reception gain of the base station to widen an uplink coverage. 11. The method of claim 10,
The base station coverage adjustment step includes:
And the load control device adjusts the uplink coverage by adjusting the reception gain for the base station in units of a predetermined level. Is installed in an IoT dedicated base station that provides an uplink unidirectional service,
A coverage determination unit for determining the terminal information located within the uplink coverage of the base station and generating coverage information;
An overload management unit for determining an overload for the base station;
A gain controller for adjusting uplink coverage by adjusting a reception gain of the base station; And
And a base station management apparatus interworking unit for providing the coverage information to an external base station management apparatus and receiving gain control information for controlling the reception gain from the base station management apparatus. 16. The method of claim 15,
The overload management unit,
A frequency utilization rate measuring unit for measuring a frequency utilization rate of the base station;
A CPU load measuring unit for measuring a CPU load given to the CPU of the base station; And
And an overload determination unit for determining overload of the base station based on at least one of the frequency use rate and the CPU load. In cooperation with a load control device provided in each of a plurality of IoT dedicated base stations for providing an uplink unidirectional service,
Generating a list of neighboring nodes including terminal list information in uplink coverage for each of the base stations, determining a redundancy of each terminal based on the neighboring node list,
Wherein the overhead of the base station is managed by adjusting the uplink coverage through the reception gain control of the base station based on the neighbor node list and the redundancy. 18. The method of claim 17,
A neighbor node list management unit for identifying a terminal in uplink coverage for each of a plurality of IOT dedicated base stations providing uplink unidirectional services and generating a neighbor list including terminal list information for each base station;
A base station load monitoring unit for determining whether the base station is overloaded based on the neighboring node list;
A base station management unit for generating reception gain information for adjusting an uplink coverage of the base station through a load controller of the base station; And
And a load control device interlocking part for receiving the coverage information or the coverage adjustment information from the load control device of the base station and transmitting the gain control information for controlling the uplink coverage to the load control device of the base station Device. 19. The method of claim 18,
The base station load monitoring unit,
Wherein the base station determines the overload for the base station based on a first determination result in which the number of terminals existing in the uplink coverage of the base station is determined based on the neighboring node list, Management device. 20. The method of claim 19,
The base station load monitoring unit,
A second determination result in which the frequency utilization rate of the base station is compared with the frequency utilization rate reference value or a third determination result in which the CPU load applied to the base station is compared with the CPU load reference value, And determining an overload for the base station based on the determination result.
KR1020150127496A 2015-09-09 2015-09-09 Method of controlling overload of base station for IoT, device for controlling overload of base station and device of managing base station KR101632386B1 (en)

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US20090052350A1 (en) * 2007-08-09 2009-02-26 Nortel Networks Limited Auto-discovery and management of base station neighbors in wireless networks
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