KR102018252B1 - Base station management device and performance method thereof - Google Patents

Base station management device and performance method thereof Download PDF

Info

Publication number
KR102018252B1
KR102018252B1 KR1020120090964A KR20120090964A KR102018252B1 KR 102018252 B1 KR102018252 B1 KR 102018252B1 KR 1020120090964 A KR1020120090964 A KR 1020120090964A KR 20120090964 A KR20120090964 A KR 20120090964A KR 102018252 B1 KR102018252 B1 KR 102018252B1
Authority
KR
South Korea
Prior art keywords
base station
terminal
allocation
base stations
base
Prior art date
Application number
KR1020120090964A
Other languages
Korean (ko)
Other versions
KR20140024682A (en
Inventor
이상민
Original Assignee
에스케이텔레콤 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 에스케이텔레콤 주식회사 filed Critical 에스케이텔레콤 주식회사
Priority to KR1020120090964A priority Critical patent/KR102018252B1/en
Publication of KR20140024682A publication Critical patent/KR20140024682A/en
Application granted granted Critical
Publication of KR102018252B1 publication Critical patent/KR102018252B1/en

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
    • H04W16/06—Hybrid resource partitioning, e.g. channel borrowing
    • H04W16/08—Load shedding arrangements
    • 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
    • H04W28/0231—Traffic management, e.g. flow control or congestion control based on communication conditions
    • H04W28/0236—Traffic management, e.g. flow control or congestion control based on communication conditions radio quality, e.g. interference, losses or delay
    • 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

According to the present invention, in a situation where the base stations are densely packed, an allocation target terminal is first determined without consideration of signal interference for an overloaded base station, and an allocation is performed so that signal interference with other interfering base stations is minimized for a base station that is not overloaded. A base station control apparatus and a base station which can minimize cell interference between base stations by determining a target terminal and further assigning radio resources by using a modulation / demodulation scheme or code rate determined to minimize signal interference to a corresponding target target terminal. A method of operating a control device is disclosed.

Description

BASE STATION MANAGEMENT DEVICE AND PERFORMANCE METHOD THEREOF

The present invention relates to a base station control apparatus and a method for operating a base station control apparatus, and more particularly, a base station control apparatus and a base station control apparatus operating method and base station apparatus capable of minimizing cell interference between base stations where signal interference is generated. It is about.

Recently, a heterogeneous network technology has been introduced to increase the frequency utilization of base station devices having different cell sizes in the same area. Besides the general Macro base station, various kinds of small cells having smaller coverage are arranged. According to the coverage among the small cells, various types of base station devices such as femto, pico, micro, and metro cell form coverage in the overlapped area and provide wireless service to the user.

In such a heterogeneous network, cell interference occurs because there are many areas where service coverage overlaps.

As such, the cell interference generated between the base stations serves as the biggest factor in reducing the transmission speed and reducing the user experience quality from the viewpoint of the terminal accessing the base station and using the communication service.

Accordingly, the present invention is to propose an effective method for minimizing cell interference between base stations where signal interference occurs.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a base station controller and a method of operating the base station controller, which can minimize cell interference between base stations where signal interference occurs. .

Base station control apparatus according to a first aspect of the present invention for achieving the above object, the base station confirmation unit for identifying a plurality of base stations that cause mutual signal interference; A terminal identification unit for identifying a plurality of terminals located in cell areas of the plurality of base stations; A load state checking unit for checking a load state of each of the plurality of base stations; And classifying the plurality of base stations into a first base station having a load state equal to or greater than a specific load state and a second base station which is a base station other than the first base station, wherein the allocation target terminal of the first base station and the second terminal of the plurality of terminals are provided. And a terminal determining unit for determining an allocation target terminal of the base station using a different allocation method.

Preferably, the terminal determining unit may determine an allocation target terminal of the first base station by assigning the terminal located in the cell area of the first base station to the first base station with respect to the first base station.

Preferably, when the second base station is 2 or more, the terminal determining unit allocates the remaining terminals other than the terminal to which the first base station is allocated among the plurality of terminals to each of the two or more second base stations. An allocation target terminal of the second base station can be determined.

Preferably, the terminal determining unit determines, for each of the two or more second base stations, the interference degree for each allocation case for each of the plurality of allocation cases for allocating at least one terminal among the remaining terminals, and the interference degree being the most. According to a small allocation case, the allocation target terminal of the second base station can be determined.

A method of operating a base station control apparatus according to a second aspect of the present invention for achieving the above object includes a base station identification step of identifying a plurality of base stations causing mutual signal interference; A terminal identification step of identifying a plurality of terminals located in cell areas of the plurality of base stations; A load status checking step of checking a load status for each of the plurality of base stations; And classifying the plurality of base stations into a first base station having a load state equal to or greater than a specific load state and a second base station which is a base station other than the first base station, wherein the allocation target terminal of the first base station and the second terminal of the plurality of terminals are provided. And a terminal determination step of determining an allocation target terminal of the base station by a different allocation method.

Preferably, the step of determining the terminal, prior to determining the terminal to be assigned to the second base station, by assigning a terminal located in the cell area of the first base station to the first base station in the manner of the first base station; The terminal to be allocated can be determined first.

Preferably, in the terminal determining step, when the second base station is 2 or more, a method of allocating the remaining terminals other than the terminal to which the first base station is allocated among the plurality of terminals to each of the two or more second base stations. The terminal to which the allocation target terminal of the second base station can be determined.

Preferably, the terminal determining step, for each of the two or more second base station, determines the degree of interference for each allocation case for each of a plurality of allocation cases for allocating at least one of the remaining terminals, the degree of interference is According to the smallest allocation case, the allocation target terminal of the second base station can be determined.

Preferably, the interference degree for each allocation case is a predicted data rate in a terminal assigned to the two or more base stations according to the allocation case and a measured data rate measured in the terminal assigned to the two or more base stations before radio resource allocation. It can be determined by the assignment case result value calculated using at least one of.

Accordingly, according to the operation method of the base station control apparatus and the base station control apparatus of the present invention, in a situation where the base stations are densely packed, the base station cell is determined by determining an allocation target terminal for minimizing the occurrence of signal interference between the base stations for each base station. The interference can be minimized, and as a result, the effect of improving the transmission speed and quality from the terminal user's point of view can be derived.

1 is a block diagram showing a communication system including a base station control apparatus according to a preferred embodiment of the present invention.
2 is a block diagram showing the configuration of a base station control apparatus according to a preferred embodiment of the present invention.
3 is a flowchart illustrating an operation flow of a communication system including a base station control apparatus according to a preferred embodiment of the present invention.
4 is a control flowchart illustrating a method of operating a base station control apparatus according to a preferred embodiment of the present invention.
5 is an exemplary view showing an example of a cell configuration according to a preferred embodiment of the present invention.

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

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

As shown in FIG. 1, a communication system including a base station control apparatus according to the present invention includes a plurality of base stations 100 and a base station control apparatus 200.

Here, the plurality of base stations 100 may include a small base station apparatus and a macro base station apparatus for constructing a small cell such as a femtocell, a picocell, and the like. Reference will be made.

The base station 100 measures a base station identifier (Cell ID) and a reference signal received power (RSRP) based on a downlink signal from another adjacent base station periodically or when a predetermined measurement event occurs. The adjacent base station related information may be provided to the base station controller 200 or the base station information DB 300.

In addition, the plurality of base stations 100 may perform terminal information (eg, terminal identification information and neighbor base station information measured by the terminal) related to a terminal connected with the base station itself as a serving cell when periodically or a predetermined measurement event occurs. : A base station separator, a signal receiving power (RSRP), etc.) may be provided to the base station controller 200 or the base station information DB 300.

Here, the base station information DB 300 stores / manages the above terminal information, neighbor base station related information, and the like, for each of the plurality of base stations 100, and also uses radio resource allocation usage rates associated with each of the plurality of base stations 100. It is desirable to store / manage it.

The plurality of base stations 100 allocates radio resources to at least one terminal located in its cell area at each radio resource allocation cycle. For example, each of the plurality of base stations 100 may allocate its radio resource to a terminal located in its cell area every 1 ms.

The base station control apparatus 200 according to the present invention identifies a plurality of base stations that cause mutual signal interference among the plurality of base stations 100, and identifies a plurality of terminals 9 located in cell areas of the plurality of base stations. Check the load status for each of the plurality of base stations.

In addition, the base station control apparatus 200 determines the allocation target terminal for each base station for each of the plurality of base stations so that the signal interference between the plurality of base stations is minimized. Here, the base station control apparatus 200, in determining the allocation target terminal for each base station for each of the plurality of base stations, may determine the allocation target terminal for each base station in a different allocation method according to the load condition of each of the plurality of base stations.

That is, the base station control apparatus 200 classifies a plurality of base stations into a first base station having a load state of a specific load state or more and a second base station which is a base station other than the first base station, and assigns the first base station among the plurality of terminals. The target terminal and the target terminal to be allocated by the second base station may be determined by different assignment methods.

In more detail, the base station control apparatus 200 may directly communicate with a plurality of base stations 100 to receive / confirm information, or the base station information DB for managing various information about the plurality of base stations 100 ( The information from the plurality of base stations 100 may be confirmed through interworking with the control unit 300, and may be a central apparatus that determines allocation target terminals for each base station for each of the plurality of base stations 100 based on the identified information.

Hereinafter, for convenience of description, base stations 1, 2, and 3 are referred to as base stations that generate mutual signal interference among the plurality of base stations 100, that is, interfering base stations, and are located in the cell area of the base stations 1, 2 and 3, respectively. Terminal 1, 2, 3, 4, 5 will be described as a terminal.

The base station control apparatus 200 according to the present invention can identify interfering base stations, such as base station 1, base station 2, and base station 3, which generate mutual signal interference among the plurality of base stations 100.

Here, the base station control apparatus 200 according to the present invention, the signal receiving power in the adjacent base station related information of each of the plurality of base stations 100 received directly from the plurality of base stations 100 or obtained from the base station information DB 300. Based on (RSRP), it can be confirmed that the interference base station by grouping the base stations having a mutually greater signal receiving power size than a specific interference size.

The base station control apparatus 200 is a base station identified as an interfering base station based on the terminal information of each of the base stations 1, 2, and 3 directly received from the base stations 100 or obtained from the base station information DB 300. A plurality of terminals 1, 2, 3, 4, and 5 located in the cell regions of 1,2 and 3 can be identified.

For example, as illustrated in FIG. 5, the base station controller 200 may include the terminal 1 (1) and the terminal 2 (2) located in the cell regions of the base station 1 (10), the base station 2 (20), and the base station 3 (30). ), Terminal 3 (3), terminal 4 (4) and terminal 5 (5) can be confirmed.

And the base station control apparatus 200 can confirm the load state of base station 1, 2, 3 identified as an interference base station.

For example, the base station control apparatus 200 checks the radio resource allocation utilization rate of each of the base stations 1, 2, and 3 directly received from the plurality of base stations 100 or obtained from the base station information DB 300 to determine the load state accordingly. You can check it.

Then, the base station control apparatus 200, base station 1, so as to minimize the signal interference between the base station 1, 2, 3 for each radio resource allocation period (for example, 1 ms) of the base station 1, 2, 3 identified as the interference base station An allocation target terminal for each base station for each of 2 and 3 may be determined, and the result of such determination may be provided to each of base stations 1, 2 and 3.

More specifically, the base station control apparatus 200 includes a plurality of base stations each having a load state equal to or greater than a specific load state for each radio resource allocation period (for example, 1 ms) of the base stations 1, 2, and 3 identified as an interfering base station. One of the base station and the interfering base station may be classified as a second base station other than the first base station. Here, the specific load state means a load state set to distinguish whether the load of the base station is overloaded or not overloaded.

Accordingly, the first base station may mean a base station in an overloaded state, and the second base station may mean a base station not in an overloaded state.

In addition, the base station control apparatus 200 may determine the terminal to be allocated in a plurality of terminals by different allocation methods for the above-described first base station and second base station.

Hereinafter, for convenience of description, the base station 1 will be referred to as a first base station having an overload state, and the base station 2 and base station 3 will be described as a second base station having no overload state.

First, the base station controller 200 may determine the terminal to be allocated to the base station 1 by assigning the terminal located in the cell area of the base station 1 to the base station 1 with respect to the base station 1.

On the other hand, the base station control apparatus 200, the base station 2 and the base station 3 in a manner of allocating the remaining terminals except for the allocation target terminal of the base station 1 of the plurality of terminals to each of the base station 2 and base station 3 in a manner of allocating The allocation target terminal of 3 can be determined.

Accordingly, each of the base stations 1, 2, and 3 allocates radio resources that can be allocated for each radio resource allocation period (for example, 1 ms) to a terminal determined by the base station controller 200, that is, an allocation target terminal determined for itself.

Hereinafter, with reference to Figure 2 will be described in more detail the base station control apparatus of the present invention as described above.

The base station control apparatus 200 according to the present invention includes a base station identification unit 210 for identifying a plurality of base stations causing mutual signal interference, and a terminal identification for identifying a plurality of terminals located in a cell area of the plurality of base stations. A unit 220, a load state confirming unit 240 for checking a load state for each of the plurality of base stations, and the plurality of base stations other than the first base station and the first base station having a load state of a specific load state or more And a terminal determination unit 230 for classifying a base station as a second base station and determining an allocation target terminal of the first base station and an allocation target terminal of the second base station among different terminals.

The base station identification unit 210 identifies a plurality of base stations that generate mutual signal interference, that is, a plurality of interfering base stations.

For example, the base station identification unit 210 may receive the signal reception power (RSRP) in the adjacent base station related information of each of the plurality of base stations 100 directly received from the plurality of base stations 100 or obtained from the base station information DB 300. As a reference, it may be confirmed that the base station having a mutually greater signal receiving power magnitude is greater than a certain interference size to be an interfering base station.

Of course, the base station identification unit 210, in addition to the above-described method can be identified as the interference base station by grouping the base stations that generate mutual signal interference among the plurality of base stations 100 through various conventional methods.

The terminal identification unit 220 identifies a plurality of terminals located in the cell region of the plurality of interfering base stations.

For example, the terminal identification unit 220 is a base station confirmed as an interference base station based on the terminal information of each of the base stations 1, 2, and 3 directly received from the base stations 100 or obtained from the base station information DB 300. For example, a plurality of terminals (eg, terminals 1, 2, 3, 4, and 5) located in the cell area of the base stations 1, 2, and 3 may be identified.

The load state checking unit 240 checks the load state for each of the plurality of interfering base stations.

For example, the load status checker 240 checks the radio resource allocation usage rate of each of the base stations 1, 2, and 3 directly received from the plurality of base stations 100 or obtained from the base station information DB 300. You can check.

The terminal determination unit 230 determines the allocation target terminal for each base station for each of the plurality of interfering base stations in the plurality of terminals so that signal interference between the plurality of interfering base stations is minimized.

In this case, the terminal determining unit 230 classifies the plurality of base stations into a first base station having a load state of a specific load state or more and a second base station which is a base station other than the first base station, and among the plurality of terminals. The allocation target terminal and the allocation target terminal of the second base station can be determined by different allocation methods.

That is, the terminal determining unit 230 may determine the allocation target terminal of the first base station by assigning the terminal located in the cell area of the first base station to the first base station.

Meanwhile, when the second base station is 2 or more, the terminal determining unit 230 distributes and allocates the remaining terminals other than the terminal to which the first base station is allocated to each of the two or more second base stations. The terminal to which the base station is assigned may be determined.

In this case, the terminal determination unit 230 determines the interference degree for each allocation case for each of the plurality of allocation cases for allocating at least one terminal among the remaining terminals, for each of the two or more second base stations, and the interference degree is determined. According to the smallest allocation case, the allocation target terminal of the second base station can be determined.

On the other hand, when there is only one second base station, the terminal determining unit 230 may determine the allocation target terminal of the second base station by the same allocation method as the first base station described above.

Hereinafter, for convenience of description, base station 1 is referred to as a first base station having a load state equal to or greater than a specific load state among base stations 1, 2, and 3 identified as an interfering base station, and a second base station other than the first base station among interfering base stations Reference will be made to base stations 2 and 3 as base stations in detail.

Here, the specific load state may mean a load state set to distinguish whether the load of the base station is overloaded or not overloaded, and thus, base station 1 means an overloaded base station, and base station 2 and base station 3 are overloaded. It may mean a base station.

The terminal determining unit 230 determines the terminal to be allocated to the base station 1 by assigning the terminal located in the cell area of the base station 1 to the base station 1 with respect to the base station 1, and the base station 2 and the base station 3 as the second base station. By determining the allocation target terminals of the base station 2 and the base station 3 by distributing the remaining terminals except the allocation target terminal of the base station 1 to each of the base station 2 and base station 3 of the plurality of terminals, it is different for each of the first base station and the second base station The allocation target terminal can be determined by the assignment method.

In more detail, the terminal determining unit 230 determines the allocation target terminal of the base station 1 with respect to the base station 1 by assigning the terminal (for example, the terminal 1) located in the cell area of the base station 1 to the base station 1. do.

Since the base station 1 is determined to be overloaded, when determining the terminal to be allocated to the overloaded base station 1 when predicting which terminal is allocated to the base station 1 when the signal interference with other interfering base stations, i.e., base stations 2 and 3 are minimized / This means that the terminal located in the cell region of the base station 1 is determined as the allocation target terminal without checking.

As a result, the terminal determining unit 230 determines, as the terminal to be allocated, the terminal located in the cell region of the base station 1 with respect to the base station 1 serving as the first base station without considering signal interference.

On the other hand, the terminal determination unit 230, the base station 2 and the base station 3 as the second base station, in a manner of allocating the remaining terminals other than the allocation target terminal of the base station 1 of the plurality of terminals to each of the base station 2 and base station 3 in a manner The allocation target terminals of the base stations 2 and 3 are determined.

In more detail, the terminal determination unit 230 determines, for each of the base stations 2 and 3, the degree of interference for each allocation case for each of the plurality of allocation cases for allocating at least one of the remaining terminals. In addition, the allocation target terminal of the base station 2 and base station 3 can be determined according to the allocation case with the smallest interference degree.

In this case, the degree of interference for each allocation case is based on the estimated data rate at the terminals allocated to the base stations 2 and 3 according to the allocation case and the measured data rates measured at the terminals allocated to the base stations 2 and 3 before the radio resource allocation. It is preferably determined by the assignment case result calculated using at least one.

In other words, the terminal determination unit 230, for each of the base stations 2 and 3 as the second base station, the remaining terminals other than the terminal 1, 2, 3, 4, and 5 to be allocated to the base station 1 (eg, terminal 1). For example, a plurality of allocation cases for allocating at least one terminal among the terminals 2, 3, 4, and 5 may be configured, and the degree of interference for each allocation case for each of the configured plurality of allocation cases may be determined.

At this time, the terminal determination unit 230, in determining the interference degree for each allocation case for each of a plurality of allocation cases, the prediction data rate and radio resource allocation in the terminal assigned to each of the base stations 2, 3 according to the allocation case It may be determined by an assignment case result value calculated using at least one of the measured data rates measured at the terminals previously allocated to each of the base stations 2 and 3.

Here, the measured data rate is preferably an average data rate measured during a specific data rate measurement interval before the radio resource allocation.

When the terminal determining unit 230 determines the degree of interference for each allocation case based on the allocation case result values calculated for each of the plurality of allocation cases as described above, the base station 2 and the base station according to the allocation case having the smallest interference degree. The allocation target terminal of 3 can be determined.

At this time, the allocation case with the largest allocation case result value may correspond to the allocation case with the smallest degree of interference.

As described above, the degree of interference for each allocation case is determined by the allocation case result value calculated for each allocation case.

Figure 112012066735273-pat00001
Equation 1

Here, i denotes each terminal allocated to each of the base stations 2 and 3 according to the Kth allocation case among the terminals 2, 3, 4, and 5, and R (i, K) is the base station 2, 3 according to the Kth allocation case. When each terminal is allocated to each terminal, it means a predicted data rate predicted for each terminal, and T (i) is a specific data rate measurement interval in relation to each terminal allocated to each of the base stations 2 and 3 according to the Kth allocation case. Mean average data rate measured during

Here, when each terminal is allocated to each of the base stations 2 and 3, predicting the predicted data rate for each terminal includes the above-described neighboring base station related information terminal information (for example, confirmed from each base station 2 or 3 or the base station information DB 300). : Terminal identification information, adjacent base station information measured by the terminal (e.g., base station identifier, signal receiving power (RSRP), etc.), or further various information that can be obtained for the base station 2, 3 (e.g., path loss, location information) Etc.), it may be possible to predict according to various existing prediction methods.

Here, α and β may be set to 0 or any real number of 0 or more and the value may be set differently depending on the weights for R (i, K) and T (i). In the following description, it is assumed that α and β are 1 for convenience of description.

Thus, for example, when referring to the terminals 2, 3, 4, and 5 as the remaining terminals located in the cell areas of the base stations 2 and 3 and the base stations 2 and 3 as the second base station, as shown in Table 1 below, An allocation case of may be configured.

Interfering base station Allocation Case 1 Allocation Case 2 Allocation Case 3 Base station2 Terminal 2 Terminal 2, 3 Terminal 2, 3 Base station3 Terminal 4, 5 Terminal 5 Terminal 4

In this case, when the allocation case 1 is described, i means each terminal 2, 4, 5 assigned to each of the base stations 2, 3 according to the K = 1 th allocation case, and R (i, K) is the K = 1 th When the terminal 2 is assigned to the base station 2 in accordance with the allocation case means the predicted data rate predicted for the terminal 2, the terminal 4, 5 is assigned to the base station 3 means the predicted data rate for the terminal 4, terminal 5, T (i) is the average measured during a specific data rate measurement period before the current radio resource allocation time, that is, the time point for determining the allocation target terminal for each base station, for each of terminals 2, 4, and 5 according to the K = 1th allocation case. The data rate.

Accordingly, the allocation case result value according to the allocation case 1 is a value obtained by dividing the predicted data rate of the terminal 2 predicted when the terminal 2 is allocated to the base station 2 by the average data rate of the terminal 2 as described above, and the base station 3 to the terminal 4, When 5 is assigned, the predicted data rate of terminal 4 divided by the average data rate of terminal 4 and the estimated data rate of terminal 5 divided by the average data rate of terminal 5 are added together.

As such, the terminal determination unit 230 calculates the allocation case result value for each of the plurality of allocation cases and checks the allocation case (eg, allocation case 1) having the largest allocation case result value, thereby confirming the allocation case ( Example: It can be judged that the interference degree of allocation case 1) is the smallest.

Accordingly, the terminal determination unit 230 may determine the allocation target terminal of the base station 2, 3 according to the allocation case 1 having the smallest interference degree, for example, the allocation case 1 described above. In other words, the terminal determination unit 230 may determine the allocation target terminal of the base stations 2 and 3 to allocate the terminal 2 to the base station 2 and the terminals 4 and 5 to the base station 3 according to the allocation case 1.

Since it is determined that the base stations 2 and 3 are not overloaded, signal interference with other interfering base stations may occur when assigning a terminal to each of the base stations 2 and 3 when determining the terminal to be allocated to the base stations 2 and 3 that are not overloaded. This means that the terminal to be allocated is determined through a process of predicting / verifying through the plurality of allocation cases described above.

Accordingly, the base station control apparatus 200 according to the present invention transmits the result of such determination in relation to the base station assignment target terminal determined for the base station 1 as the first base station and the base stations 2 and 3 as the second base station as described above. , 2, 3 to each of the base station 1, 2, 3 so as to allocate the radio resources that can be allocated at the time of the current radio resource allocation to the terminal determined by the base station control apparatus 200, that is, the allocation target terminal determined for itself. can do.

For example, according to the allocation case 1 described above, as shown in FIG. 5, the base station 1 10 transmits a radio resource to the terminal 1 (1) having determined the radio resource at the time of allocating the radio resource at the base station controller 200, and the base station 2. 20, the base station control device to the terminal 2 (2) determined by the base station control apparatus 200 at the current radio resource allocation time, the base station 3 (30) is the base station control apparatus It may be assigned to the terminal 4 (4) and terminal 5 (5) determined in (200).

Accordingly, the base station control apparatus 200 according to the present invention repeatedly assigns the base station allocation target terminal to the interfering base station generating mutual signal interference among the plurality of base stations 100 for each radio resource allocation period of each interfering base station as described above. By providing the determination result to each interfering base station, the radio resources that can be allocated to each radio resource allocation period (for example, 1 ms) in each of the base station 1, 2, 3 to the terminal that is determined by the base station controller 200 The allocation target terminal can be assigned to the terminal to be determined.

Furthermore, the base station control apparatus 200 according to the present invention may further include a variable determination unit 250.

The variable determiner 250 is configured such that the signal interference by the remaining interfering base stations among the plurality of interfering base stations is minimized in relation to the specific interfering base stations among the plurality of interfering base stations confirmed by the base station confirming unit 210. The modulation / demodulation method or code rate associated with the radio resource allocated to the terminal to be allocated is variably determined.

Here, the specific interference base station may mean each of a plurality of interference base stations confirmed by the base station identification unit 210, for example, each of the base stations 1, 2, and 3 described above.

In other words, for example, the base station 1 as a specific interfering base station, the variable determination unit 250, in relation to the base station 1, the allocation target terminal of the base station 1 so that the signal interference by the remaining interfering base station, i. The modulation and demodulation scheme or code rate associated with the radio resource allocated to the mobile station can be variably determined.

For example, the variable determination unit 250 may be assigned to the base station 1 according to the base station assignment target terminal determined by the terminal determination unit 230 described above. You can check the amount of interference.

Accordingly, the variable determination unit 250 may variably determine a modulation / demodulation method or code rate related to a radio resource allocated from the base station 1 to the terminal 1 according to the identified interference amount.

For example, the variable determination unit 250 determines that the signal interference by the remaining interfering base stations, that is, the base stations 2 and 3, is greater as the amount of the interference identified as described above increases, and thus, the base station 1 is associated with the radio resource allocated to the terminal 1. The modulation and demodulation method can be determined as a low modulation and demodulation method.

For example, the variable determination unit 250 may define a first range, a second range, and a third range according to the interference amount, and if the interference amount identified as described above belongs to the first range, the base station 1 allocates the terminal 1 to the terminal 1. The modulation and demodulation method related to radio resources is determined as the lowest modulation and demodulation method (eg, QPSK), and if the amount of interference identified as described above falls within the second range, the modulation and demodulation method related to radio resources allocated from the base station 1 to the terminal 1 is second. If it is determined as a low modulation / demodulation method (eg 16QAM) and the amount of interference identified as described above falls within the third range, the modulation / demodulation method related to radio resources allocated from the base station 1 to the terminal 1 is the highest modulation / demodulation method (eg 64 QAM). You can decide.

Alternatively, the variable determiner 250 determines that signal interference by the remaining interfering base stations, i.e., base stations 2 and 3, is greater as the amount of interference confirmed as described above is greater, and thus, the code rate related to the radio resource allocated from the base station 1 to the terminal 1 Can be largely determined.

The code rate is a method of converting an original data size (e.g. 3 bits) into a large data size (e.g. 6 bits) and transmitting the original data size (e.g., 6 bits). .

Accordingly, the base station control apparatus according to the present invention first determines the allocation target terminal without considering signal interference among the interfering base stations that cause mutual signal interference, and signals with other interfering base stations for the base stations which are not overloaded. The terminal to be allocated to minimize the interference is determined, and further, the modulation / demodulation method or code rate according to the amount of interference in assigning radio resources to the terminal to be allocated by each interfering base station is determined, and the decision result is provided to each interfering base station. Thus, each of the interfering base stations can be assigned to the radio resources by using the modulation and demodulation method or code rate determined by the base station control device, that is, the terminal to be allocated by the base station control apparatus for each radio resource allocation period (for example, 1ms).

Therefore, according to the base station control apparatus according to the present invention, in a situation where the base stations are densely configured, by determining the allocation target terminal that can minimize the occurrence of signal interference between base stations for each base station to minimize the cell interference between base stations As a result, it is possible to derive the effect of improving the transmission speed and quality from the terminal user's point of view.

Hereinafter, an operation method of a base station control apparatus according to the present invention will be described with reference to FIGS. 3 to 4.

First, an operation flow of a communication system including a base station control apparatus according to the present invention will be described with reference to FIG. 3.

The base station control apparatus 200 identifies a plurality of interfering base stations generating mutual signal interference among the plurality of base stations 100 (S20).

For example, the plurality of base stations 100 may periodically perform a base station identifier (Cell ID) and a reference signal received power (RSRP) based on downlink signals from other adjacent base stations when a predetermined measurement event occurs. The base station controller 200 may provide the neighbor base station-related information measured by the base station controller 200 (S10), and the base station controller 200 uses the information to generate a plurality of signal interferences among the plurality of base stations 100. Interfering base stations can be identified.

For example, the base station control apparatus 200 according to the present invention may identify an interfering base station, that is, base station 1, base station 2, and base station 3, which generate mutual signal interference among the plurality of base stations 100.

The base station control apparatus 200 is a base station identified as an interfering base station based on the terminal information of each of the base stations 1, 2, and 3 directly received from the base stations 100 or obtained from the base station information DB 300. A plurality of terminals 1, 2, 3, 4, and 5 located in the cell regions of 1,2 and 3 can be identified (S30).

Then, the base station control apparatus 200 can check the load state of the base station 1, 2, 3 identified as the interfering base station (S35).

For example, the base station control apparatus 200 checks the radio resource allocation utilization rate of each of the base stations 1, 2, and 3 directly received from the plurality of base stations 100 or obtained from the base station information DB 300 to determine the load state accordingly. You can check it.

Then, the base station control apparatus 200, base station 1, so as to minimize the signal interference between the base station 1, 2, 3 for each radio resource allocation period (for example, 1 ms) of the base station 1, 2, 3 identified as the interference base station An allocation target terminal for each base station for each of 2 and 3 may be determined (S40), and the determination result may be provided to each of the base stations 1, 2 and 3 (S50).

More specifically, the base station control apparatus 200 includes a plurality of base stations each having a load state equal to or greater than a specific load state for each radio resource allocation period (for example, 1 ms) of the base stations 1, 2, and 3 identified as an interfering base station. It may be classified as a base station 2 and a base station 2 other than the base station.

In addition, the base station control apparatus 200 may determine the terminal to be allocated in a plurality of terminals by different allocation methods for the above-described first base station and second base station.

For example, referring to base station 1 as a first base station having an overload state, and referring to base station 2 and base station 3 as a second base station not having an overload state, the base station control apparatus 200, The allocation target terminal of the base station 1 can be determined by assigning the terminal located in the cell area of the base station 1 to the base station 1. On the other hand, the base station control apparatus 200, the base station 2 and the base station 3 in a manner of allocating the remaining terminals except for the allocation target terminal of the base station 1 of the plurality of terminals to each of the base station 2 and base station 3 in a manner of allocating The allocation target terminal of 3 can be determined.

Accordingly, each of the base stations 1, 2, and 3 allocates radio resources that can be allocated for each radio resource allocation period (for example, 1 ms) to a terminal determined by the base station controller 200, that is, an allocation target terminal determined for itself ( S60, S62, S64).

Hereinafter, an operation method of the base station control apparatus according to the present invention will be described in detail with reference to FIG. 4.

The operation method of the base station control apparatus according to the present invention identifies a plurality of interfering base stations that generate mutual signal interference (S100).

For example, the method of operating the base station control apparatus according to the present invention includes a signal reception power in the neighbor base station related information of each of the plurality of base stations 100 directly received from the plurality of base stations 100 or obtained from the base station information DB 300. Based on the (RSRP), it can be confirmed that the interference base station by grouping the base station (eg, base station 1, 2, 3) having a signal interference power of more than a certain interference size.

In addition, the operation method of the base station control apparatus according to the present invention confirms a plurality of terminals located in the cell area of the plurality of interfering base stations (S110).

For example, the operation method of the base station control apparatus according to the present invention, based on the terminal information of each of the base station 1, 2, 3 received directly from the plurality of base stations 100 or obtained from the base station information DB 300, the interference base station As described above, a plurality of terminals (eg, terminals 1, 2, 3, 4, 5) located in the cell region of the base stations 1, 2, 3 can be identified.

Hereinafter, for convenience of description, reference is made to base stations 1, 2, and 3 as interference base stations generating mutual signal interference among the plurality of base stations 100, and as a plurality of terminals located in the cell region of base stations 1, 2, 3 Terminal 1, 2, 3, 4, 5 will be described.

In addition, the operation method of the base station control apparatus according to the present invention, by checking the load state for each of the plurality of interfering base station, a plurality of base stations other than the first base station having a load state of a specific load state or more than the first base station Classified as a second base station that is a base station of (S120).

Accordingly, in the method of operating the base station control apparatus according to the present invention, the plurality of terminals can determine the terminal to be allocated in a different allocation scheme for each of the above-described first base station and second base station.

Here, the specific load state may mean a load state set to distinguish whether the load of the base station is overloaded or not overloaded. Accordingly, the first base station may mean a base station in an overloaded state, and the second base station may mean a base station not in an overloaded state.

Hereinafter, for convenience of description, base station 1 is referred to as a first base station having an overloaded state among base stations 1, 2, and 3 identified as an interfering base station, and base station 2 and base station 3 are referred to as a second base station having no overloaded state. This will be described in detail.

A method for operating a base station control apparatus according to the present invention is to assign a terminal (eg, terminal 1) located in a cell area of base station 1 to base station 1 with respect to base station 1 as a first base station. It may be determined (S130).

That is, when determining the terminal to be allocated to the base station 1 that is overloaded, the signal interference with other interference base stations, i.e., base stations 2 and 3, is minimized when assigning which terminal to the base station 1, that is, signal interference. This means that the terminal located in the cell region of the base station 1 is determined as the allocation target terminal without consideration for.

On the other hand, the operation method of the base station control apparatus according to the present invention, for the base station 2 and the base station 3 as the second base station, by distributing the remaining terminals other than the target terminal of the base station 1 among the plurality of terminals to each of the base station 2 and base station 3 by The allocation target terminals of the base station 2 and the base station 3 are determined by the allocation method (S140 to S150).

In more detail, in the method for operating a base station control apparatus according to the present invention, interference for each allocation case for each of a plurality of allocation cases for allocating at least one of the remaining terminals described above to each of the base stations 2 and 3 The degree of determination and the allocation target terminals of the base station 2 and the base station 3 can be determined according to the allocation case having the smallest interference degree.

In this case, the degree of interference for each allocation case is based on the estimated data rate at the terminals allocated to the base stations 2 and 3 according to the allocation case and the measured data rates measured at the terminals allocated to the base stations 2 and 3 before the radio resource allocation. It is determined by the allocation case result value calculated using at least one, and the measured data rate is preferably the average data rate measured during a specific data rate measurement interval prior to the radio resource allocation.

In other words, the operation method of the base station control apparatus according to the present invention, for each of the base station 2,3 as the second base station, of the terminal 1, 2, 3, 4, 5 of the target base station 1 of the base station 1 (for example, terminal 1) Compose a plurality of allocation cases for allocating at least one terminal out of the remaining terminals (eg, terminals 2, 3, 4, 5), and calculates an allocation case result value for each of the configured multiple allocation cases (S140). .

In the operation method of the base station control apparatus according to the present invention, if the interference degree for each allocation case is determined based on the allocation case result values calculated for each of the plurality of allocation cases as described above, according to the allocation case having the smallest interference degree, The allocation target terminal of the base station 2 and the base station 3 can be determined (S150).

The determination of the interference degree for each allocation case based on the allocation case result value calculated for each allocation case is omitted since it has been described in detail with reference to Equation 1 above.

Furthermore, in the method of operating the base station control apparatus according to the present invention, in relation to a specific interfering base station among a plurality of interfering base stations, the allocation of the specific interfering base station so that signal interference by the remaining interfering base stations among the plurality of interfering base stations is minimized. Variable modulation and demodulation method or code rate related to a radio resource allocated to the target terminal is variably determined (S160 to S170). Here, the specific interfering base station may mean each of a plurality of interfering base stations, for example, each of the base stations 1, 2, and 3 described above.

In other words, for example, the base station 1 as a specific interfering base station, the operation method of the base station control apparatus according to the present invention, in relation to the terminal, for example, terminal 1 to be assigned to the base station 1 according to the allocation target terminal for each base station determined as described above The amount of interference by the interfering base stations, that is, the base stations 2 and 3 may be confirmed (S160).

Accordingly, the method of operating the base station control apparatus according to the present invention may variably determine a modulation / demodulation method or a code rate related to a radio resource allocated from the base station 1 to the terminal 1 according to the identified interference amount (S170).

For example, in the method of operating the base station control apparatus according to the present invention, the greater the amount of interference identified as described above, the greater the signal interference caused by the remaining interfering base stations, i.e., base stations 2 and 3, and the base station 1 is allocated to the terminal 1. The modulation and demodulation method related to radio resources can be determined as a low modulation and demodulation method.

Or, the operation method of the base station control apparatus according to the present invention, the greater the amount of interference identified as described above, the greater the signal interference by the remaining interfering base station, that is, the base station 2, 3, the radio resources to be allocated from the base station 1 to the terminal 1 The code rate associated with this can be largely determined.

Accordingly, in the method of operating the base station controller according to the present invention, among the interfering base stations generating mutual signal interference, the base station under overload is first determined without considering signal interference, and the other interfering base stations for the base station not under overload are determined. The terminal to be allocated to minimize the signal interference with each other is determined, and further, the modulation / demodulation method or code rate is determined according to the amount of interference in the allocation of radio resources to the terminal to be allocated by each interfering base station. It may be provided to the base station (S180).

Therefore, according to the operation method of the base station control apparatus according to the present invention as described above, in a situation where the base stations are densely packed, the base station between the base stations by determining the allocation target terminal that can minimize the occurrence of signal interference between the base stations for each base station It is possible to minimize cell interference, and as a result, it is possible to derive an effect of improving transmission speed and quality from a terminal user's point of view.

The method for operating a base station control apparatus according to an embodiment of the present invention may be implemented in the form of program instructions that can be executed by various computer means and recorded in a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. Program instructions recorded on the media may be those specially designed and constructed for the purposes of the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks. Magneto-optical media, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like. The hardware device described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

Although the present invention has been described in detail with reference to preferred embodiments, the present invention is not limited to the above-described embodiments, and the technical field to which the present invention belongs without departing from the gist of the present invention as claimed in the following claims. Anyone skilled in the art will have the technical idea of the present invention to the extent that various modifications or changes are possible.

According to the operating method of the base station control apparatus and the base station control apparatus according to the present invention, in a situation where the base stations are densely packed, the terminal to be assigned to determine the signal interference between the base stations to minimize each base station and the minimum signal interference In order to minimize radio interference between base stations by allocating radio resources by using a modulation / demodulation method or code rate, the market or sales of the applied device is not limited to the use of related technology as it overcomes the limitations of the existing technology. Not only is the possibility of being sufficient but also practically evident to the extent that the invention has industrial applicability.

9: terminal 100: multiple base stations
200: base station controller 300: base station information DB

Claims (9)

A base station identification unit for identifying a plurality of base stations causing mutual signal interference;
A terminal identification unit for identifying a plurality of terminals located in cell areas of the plurality of base stations;
A load state checking unit for checking a load state of each of the plurality of base stations; And
The plurality of base stations are classified into a first base station having a load state equal to or greater than a specific load state and a second base station which is a base station other than the first base station, and is allocated to the first base station among the plurality of terminals and the first target station. A terminal determination unit for determining an allocation target terminal allocated to two base stations by a different allocation method,
The terminal determination unit,
Determining an allocation target terminal of the first base station by assigning the terminal located in the cell area of the first base station to the first base station without considering signal interference,
For the second base station, to determine the allocation target terminal of the second base station by assigning the remaining terminal except the allocation target terminal of the first base station of the plurality of terminals to the second base station to minimize signal interference Base station control apparatus, characterized in that. delete The method of claim 1,
The terminal determination unit,
When the second base station is 2 or more, the allocation target terminal of the second base station is allocated by distributing and assigning the remaining terminals other than the allocation target terminal of the first base station among the plurality of terminals to each of the two or more second base stations. Base station control apparatus, characterized in that for determining. The method of claim 3, wherein
The terminal determination unit,
For each of the two or more second base stations, the interference degree for each allocation case for each of the plurality of allocation cases for allocating at least one terminal among the remaining terminals is determined, and the second base station is determined according to the allocation case having the smallest interference degree. The base station control apparatus, characterized in that for determining the terminal to be assigned. A base station identification step of identifying a plurality of base stations causing mutual signal interference;
A terminal identification step of identifying a plurality of terminals located in cell areas of the plurality of base stations;
A load status checking step of checking a load status for each of the plurality of base stations; And
The plurality of base stations are classified into a first base station having a load state equal to or greater than a specific load state and a second base station which is a base station other than the first base station, and is allocated to the first base station among the plurality of terminals and the first target station. A terminal determination step of determining, by a different allocation method, an allocation target terminal allocated to two base stations,
The terminal determination step,
Determining an allocation target terminal of the first base station by assigning the terminal located in the cell area of the first base station to the first base station without considering signal interference,
For the second base station, to determine the allocation target terminal of the second base station by assigning the remaining terminal except the allocation target terminal of the first base station of the plurality of terminals to the second base station to minimize signal interference Method of operation of the base station controller, characterized in that. delete The method of claim 5,
The terminal determination step,
When the second base station is 2 or more, the allocation target terminal of the second base station is allocated by distributing and assigning the remaining terminals other than the allocation target terminal of the first base station among the plurality of terminals to each of the two or more second base stations. Method of operation of the base station controller, characterized in that for determining. The method of claim 7, wherein
The terminal determination step,
For each of the two or more second base stations, the interference degree for each allocation case for each of the plurality of allocation cases for allocating at least one terminal among the remaining terminals is determined, and the second base station is determined according to the allocation case having the smallest interference degree. A method for operating a base station control apparatus, characterized in that for determining the terminal to be assigned. The method of claim 8,
The degree of interference for each allocation case is
An allocation case result value calculated using at least one of a predicted data rate at a terminal assigned to the at least two base stations according to the allocation case and a measured data rate measured at a terminal assigned to the at least two base stations before radio resource allocation; Method of operation of the base station controller, characterized in that determined by.
KR1020120090964A 2012-08-20 2012-08-20 Base station management device and performance method thereof KR102018252B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020120090964A KR102018252B1 (en) 2012-08-20 2012-08-20 Base station management device and performance method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020120090964A KR102018252B1 (en) 2012-08-20 2012-08-20 Base station management device and performance method thereof

Publications (2)

Publication Number Publication Date
KR20140024682A KR20140024682A (en) 2014-03-03
KR102018252B1 true KR102018252B1 (en) 2019-09-04

Family

ID=50640208

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020120090964A KR102018252B1 (en) 2012-08-20 2012-08-20 Base station management device and performance method thereof

Country Status (1)

Country Link
KR (1) KR102018252B1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101632386B1 (en) * 2015-09-09 2016-07-01 주식회사 케이티 Method of controlling overload of base station for IoT, device for controlling overload of base station and device of managing base station
KR101953650B1 (en) * 2016-09-19 2019-03-04 에스케이텔레콤 주식회사 Networlk device and control method thereof
US11076322B2 (en) 2016-09-12 2021-07-27 Sk Telecom Co., Ltd. Internet of things network device and method for excluding a base station based on a received pushdata message
KR102143424B1 (en) * 2016-12-09 2020-10-15 한국전자통신연구원 Method for controlling access based on service level and apparatus for the same
KR102111130B1 (en) * 2019-02-13 2020-05-14 국방과학연구소 Apparatus and method for managing dual connectivity

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101003655B1 (en) * 2007-06-13 2010-12-23 주식회사 케이티 Power allocation method and mobile communication system using the same

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8228853B2 (en) * 2008-02-01 2012-07-24 Qualcomm Incorporated Serving base station selection in a wireless communication network
KR101641106B1 (en) * 2010-06-09 2016-07-20 삼성전자주식회사 Method of communication for mobile terminal, pico base station and macro base station in heterogeneous network

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101003655B1 (en) * 2007-06-13 2010-12-23 주식회사 케이티 Power allocation method and mobile communication system using the same

Also Published As

Publication number Publication date
KR20140024682A (en) 2014-03-03

Similar Documents

Publication Publication Date Title
JP4695135B2 (en) Dynamic allocation of radio resources
US8880089B2 (en) Mobile communication system and radio resource assignment method
RU2598530C1 (en) Device and method for managing wireless data transmission resources
JP5657765B2 (en) Method for controlling operation in a cell of a wireless cellular network, base station and wireless cellular network
US9571177B2 (en) Communication method of macro base station, macro terminal, micro base station, and micro terminal for interference control in hierarchical cellular network
KR20110065410A (en) Over-the-air intercell interference coordination methods in cellular systems
WO2012079757A1 (en) Technique for inter-cell interference coordination in a heterogeneous communication network
KR102018252B1 (en) Base station management device and performance method thereof
WO2012045584A1 (en) Interference mitigation on a physical downlink control channel
US20180343658A1 (en) Communication system and method
CN102598756A (en) Macrocell base station and communication control method
US10425823B2 (en) Cell management apparatus and method for operating cell management apparatus
JP5470505B2 (en) Base station and method for operating the base station
CN107787045B (en) Inter-cell interference coordination method and system
KR101244085B1 (en) Base station, relay station and method for allocating transmission power
KR101902755B1 (en) Base station management device and performance method thereof
KR101600955B1 (en) Base station and control method thereof
KR101939071B1 (en) Base station apparatus and control method thereof
KR20140075244A (en) Method and apparatus for resource allocation based on the buffer status information at neighbor cell
Mohamad Maharum et al. A demand‐based spectrum orthogonalisation scheme for interference avoidance in LTE‐Advanced heterogeneous networks
KR101952776B1 (en) Femto cell apparatus and method for assigning tracking area code thereby
KR101422578B1 (en) Method and apparatus for allocating resource by using inter-cell interference separation
KR102025914B1 (en) Base station apparatus and control method thereof
KR101500639B1 (en) Method for assigning downlink radio resource in femto access point and femto access point therefor
KR20140009857A (en) Base station resource management device and performance method thereof

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
AMND Amendment
E601 Decision to refuse application
AMND Amendment
X701 Decision to grant (after re-examination)
GRNT Written decision to grant