KR101530375B1 - System and method for interference mitigation - Google Patents
System and method for interference mitigation Download PDFInfo
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- KR101530375B1 KR101530375B1 KR1020130115190A KR20130115190A KR101530375B1 KR 101530375 B1 KR101530375 B1 KR 101530375B1 KR 1020130115190 A KR1020130115190 A KR 1020130115190A KR 20130115190 A KR20130115190 A KR 20130115190A KR 101530375 B1 KR101530375 B1 KR 101530375B1
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Abstract
The present invention relates to an interference mitigation system and an interference mitigation method. According to a first aspect of the present invention, there is provided an interference mitigation system for mitigating interference of a first base station, comprising: a status confirmation unit configured to observe a neighbor wireless network around the first base station to obtain wireless network observation result information; A mode determination unit configured to determine a cluster mode of the cluster based on the number of base stations in the cluster, and a mode determination unit configured to determine whether the cluster mode is the interference mitigation mode And a subband allocation unit configured to allocate a subband to the first base station.
Description
The present invention relates to an interference mitigation system and an interference mitigation method, and more particularly, to a system and method for mitigating interference to a base station by forming a cluster of base stations where interference is detected.
2. Description of the Related Art In recent years, as the usage amount of wireless mobile communication has increased, a large number of base stations have been installed to increase wireless mobile communication capacity and coverage.
With respect to supplementing the shaded areas of macro base stations and distributing traffic, a compact base station is cost effective. However, as the number of small base stations increases, network optimization becomes difficult and interference problems occur.
In order to reduce the interference problem between the base stations, frequency segmentation (FS) technology can be applied. The FS technique is to divide the entire frequency band into a plurality of subbands and allocate the plurality of subbands to the base station so that the interference can be minimized, and a fractional frequency reuse (FFR) Frequency use efficiency is increased than that of FS technique because base stations are reused by dividing a part of the band.
Therefore, the FFR technology can be applied together with the FS technique. Since the FFR technique uses only a part of the entire frequency resources for the cell, there is a problem that the frequency resource can not be utilized sufficiently.
Such FFR technology can be largely divided into a Hard-FFR scheme and a Soft-FFR scheme.
The Hard-FFR scheme allocates a cell reserved band composed of a common band and a plurality of subbands. That is, the Hard-FFR scheme divides two frequency bands, allocates frequency resources of a common band to cells in the center of the cell, and allocates subbands allocated to cells around the cells.
However, in the Hard-FFR scheme, the frequency resources of the cell center and the cells are separated from each other, so that frequency resources that can be allocated when the UE moves to a specific area may become insufficient. In addition, since the Hard-FFR scheme can not use subbands not allocated in a cell, it has a problem that frequency resources can not be efficiently used.
On the other hand, the Soft-FFR scheme has a power-boosted subband for allocation of UEs around the cell, and all remaining frequency resources except for the subband are allocated to UEs in the cell center. Since the base station can use the entire frequency band, frequency resources that can be allocated to the cell-center terminals are larger than Hard-FFR. However, compared with Hard-FFR, the Soft-FFR has a problem that the improvement of SINR (Signal to Interference Noise Ratio) of a peripheral terminal is somewhat limited.
That is, when the coverage is made with many base stations, a portion of the cell where the interference signal is relatively large increases, which leads to a decrease in capacity of the entire network. In order to solve this problem, the FS and FFR interference mitigation methods can be used. However, since there is a problem of resource waste that can not freely use all the frequency bands, the FS scheme and the FFR scheme It is not appropriate to apply the interference mitigation method of the present invention collectively. Therefore, a technique for solving the above-described problems is required.
On the other hand, the background art described above is technical information acquired by the inventor for the derivation of the present invention or obtained in the derivation process of the present invention, and can not necessarily be a known technology disclosed to the general public before the application of the present invention .
An embodiment of the present invention is directed to providing an interference mitigation system and a method of mitigating interference.
It is also an object of the present invention to minimize the network optimization cost of small base stations.
According to a first aspect of the present invention, there is provided an interference mitigation system for mitigating interference of a first base station, comprising: a base station for observing a neighboring wireless network around the first base station, A cluster unit configured to form a cluster of the first base station based on the observation result information, a mode unit configured to determine a cluster mode of the cluster based on the number of base stations in the cluster, And a subband allocation unit configured to allocate subbands to the first base station if the cluster mode is the interference mitigation mode.
According to a second aspect of the present invention, there is provided an interference mitigation method performed in an interference mitigation system, comprising the steps of: observing a neighboring wireless network around a first base station to obtain wireless network observation result information; The method comprising the steps of: forming a cluster of the first base station based on information of the first base station, determining a cluster mode of the cluster based on the number of base stations in the cluster, And assigning subbands to the subbands.
According to a third aspect of the present invention, there is provided a computer readable medium having recorded thereon a program for performing an interference mitigation method, the interference mitigation method comprising: Wherein the cluster part forms the cluster of the first base station based on the observation result information, the mode determination part determines the cluster mode of the cluster based on the number of base stations in the cluster, And allocating subbands to the first base station if the cluster mode is an interference mitigation mode.
According to any one of the above-mentioned objects of the present invention, an embodiment of the present invention can provide an interference mitigation system and an interference mitigation method.
Further, an embodiment of the present invention can minimize network optimization costs of small base stations.
According to any one of the tasks of the present invention, an embodiment of the present invention automatically classifies an area having high interference and an area not having high interference, and uses an interference mitigation scheme suitable for each area and optimizes subband allocation The capacity of the base station can be increased.
In addition, according to any one of the tasks of the present invention, an embodiment of the present invention can be combined with a SON (Self Organizing Network) function to reduce the interference when the number of small base stations increases, FFR technology can be provided.
According to any one of the tasks of the present invention, an embodiment of the present invention can improve the frequency resource use efficiency and the capacity of a wireless network, and at the same time mitigate inter-cell interference, thereby ensuring service quality of a terminal around a cell.
The effects obtained by the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those skilled in the art from the following description will be.
1 is a configuration diagram of an interference mitigation system according to an embodiment of the present invention.
2 is a block diagram illustrating a base station apparatus according to an embodiment of the present invention.
3 is a block diagram illustrating a SON server according to an embodiment of the present invention.
4 to 7 are flowcharts for explaining an interference mitigation method according to an embodiment of the present invention.
8 to 12 are diagrams for explaining an interference mitigation method according to an embodiment of the present invention.
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.
Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between . Also, when an element is referred to as "comprising ", it means that it can include other elements as well, without departing from the other elements unless specifically stated otherwise.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
1 is a block diagram of an interference mitigation system 100 according to an embodiment of the present invention.
The interference mitigation system 100 includes one or more
Each of the components constituting the interference mitigation system 100 can communicate via the network N. [
The network N may be a local area network (LAN), a wide area network (WAN), a value added network (VAN), a personal area network (PAN) , A mobile radio communication network, a satellite communication network, or an EPC (Evolved Packet Core).
Meanwhile, the
The SON
2 is a block diagram illustrating a
The
The
The base
On the other hand, the
The
On the other hand, the state transmitting
On the other hand, the
Each of the above-described components is preferably implemented in the
3 is a block diagram illustrating a
The
The
Meanwhile, the base
In addition, the base
That is, the base
On the other hand, the
The
In addition, the
In addition, the
On the other hand, the
That is, the
On the other hand, the
For this, the
Based on such interference link information, the
The
That is, when the sub-band allocation for the base station having the (i-1) th allocation order is completed, the
At this time, the
At this time, when there are a plurality of searched subbands, the subbands randomly selected from among the searched subbands are allocated to the base station, or the subbands selected according to a predetermined method by the
The number and size of subbands assignable to the cluster at this time can be determined based on the number of base stations included in the cluster. For example, the entire band can be divided according to the number of base stations. Also, for example, the entire band can be divided into subbands according to the size of the subbands. However, the manner of determining the number and size of subbands is not limited to the above-described example.
The
On the other hand, if the cluster mode is in the normal mode, the
Each of the above-described components is preferably implemented in the
4 to 7 are flowcharts for explaining an interference mitigation method according to an embodiment of the present invention performed by the interference mitigation system.
The interference mitigation method according to the embodiment shown in Figs. 4 to 7 is performed in a time-wise manner in the interference mitigation system 100, the
As shown in FIG. 4, the status checker may observe the surrounding wireless network to obtain the wireless network observation result information (S410).
Then, the state transmitting unit can transmit the observation result information acquired by the state checking unit to the base station managing unit.
The cluster unit may form base stations having interference with each other as one cluster based on observation result information received from all base stations (S420).
5 is a flowchart for explaining a method of forming a cluster by adding a base station to a cluster by the cluster unit.
First, based on the observation result information transmitted by the state checking unit of the base station, the cluster unit may determine whether there is an interference base station interfering with the base station around the base station (S421). If there are a plurality of interference base stations (S424), the clusters of the respective interference base stations are merged (S423), and the base station can be added to the merged cluster (S424). On the other hand, if there is an interfering base station but one interfering base station exists, the base station can be added to the cluster in which the interfering base station exists (S425).
Meanwhile, an interference base station may not exist around the base station. That is, if there is no interference base station, the cluster unit creates a cluster (S426), and adds the base station to the generated cluster (S427).
When the cluster of the base station is formed as described above, the mode determination unit may determine the cluster mode of the cluster (S430).
6 is a flowchart for explaining an embodiment for determining a cluster mode of a cluster by the mode determination unit.
That is, as shown in FIG. 6, it may be determined whether the number of base stations included in the cluster exceeds a predetermined threshold (S431).
If the total number of base stations included in the cluster exceeds the threshold, the cluster mode of the cluster can be set to the interference mitigation mode (S432). If the total number of base stations included in the cluster is less than the threshold value, (S433).
Meanwhile, if the cluster mode is determined according to the above-described method, the interference mitigation system can perform network optimization on a cluster-by-cluster basis.
That is, if the cluster mode is in the normal mode (S440), the base station apparatus can be operated using the entire band (S450).
On the other hand, if the cluster mode is the interference mitigation mode, subbands can be allocated to the base station apparatus according to the optimized subband allocation scheme (S460).
FIG. 7 is a flowchart for explaining an embodiment for optimizing subband allocation if the cluster mode is an interference mitigation mode, and will be described with reference to FIG. 7 with reference to FIGS. 8 to 12. FIG. 8 to 12 are diagrams for explaining an interference mitigation method according to an embodiment of the present invention.
As shown in FIG. 7, if the cluster mode is the interference mitigation mode, the subband assignment unit may generate interference link information between the BSs included in the cluster (S461).
8, assuming that the
Then, based on the interference link information, the priority among the base stations included in the cluster can be determined (S462). For example, a base station with the highest number of interfering links may be the highest priority and a priority may be set by the number of interfering links. Thus, for example, as shown in FIG. 11, the
Then, the subband assignment unit can determine the number and size of subbands (S463). At this time, the subsequent relationship of step S462 and step S463 may be changed.
On the other hand, the subband assignment unit includes at least one of a base station (hereinafter referred to as a first base station for convenience of description) and a base station linked to the first base station (hereinafter referred to as a second base station for convenience of description) A subband not used by one base station can be searched (S464).
In a case where a subband not used by at least one of the first base station and the second base station is searched, the searched subband may be allocated to the first base station (S465).
Of course, a plurality of subbands not used in at least one of the first base station and the second base station may be searched for, and a randomly selected subband may be selected from among the searched subbands, May assign the selected sub-band to the first base station.
On the other hand, in both the first base station and the second base station, if all subbands are used, the subband assignment unit can select a subband having a minimum signal strength for the first base station, (S466).
As described above, the subbands are allocated to the first base station, so that the interference link information can be updated (S467).
Referring to FIG. 11, the first to third bands may exist as subbands. For each of the
After the sub-band is allocated to the base station, if the base station is not the lowest-order base station, steps S464 through S467 described above may be repeated (S468). That is, when the first base station has the allocation order i, the first base station can allocate a subband when the subband allocation for the (i-1) th base station is completed.
If subbands are allocated to each base station according to the above-described method, each base station can perform communication in which interference is mitigated by applying the allocated subbands (S470).
12, which is an exemplary diagram for explaining an interference mitigation method according to an embodiment of the present invention, a plurality of base station apparatuses are added to each of the clusters K, L, and M, and subband optimization is performed in each cluster Can be performed. According to the interference mitigation method according to an embodiment of the present invention, even if the number of base stations in a network increases rapidly, frequency can be efficiently allocated, frequency waste can be minimized, and interference can be mitigated.
As the cluster size increases, the capacity of the SON server must be increased to optimize the frequency allocation. If the capacity of the SON server is insufficient, the interference mitigation system can limit the size of each cluster.
The interference mitigation method according to the embodiment described with reference to Figs. 4 to 7 may also be implemented in the form of a recording medium including instructions executable by a computer, such as a program module, which is executed by a computer. Computer readable media can be any available media that can be accessed by a computer and includes both volatile and nonvolatile media, removable and non-removable media. In addition, the computer-readable medium may include both computer storage media and communication media. Computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Communication media typically includes any information delivery media, including computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave, or other transport mechanism.
It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.
The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.
100: interference mitigation system
20: Base station
30: SON server
Claims (21)
A status checker configured to monitor a neighboring wireless network around the first base station to obtain wireless network observation result information;
A cluster unit configured to form a cluster of the first base station based on the observation result information;
A mode determination unit configured to determine a cluster mode of the cluster based on the number of base stations in the cluster; And
And a subband allocation unit configured to allocate a subband to the first base station if the cluster mode is an interference mitigation mode,
The mode determination unit may further include:
And to set the cluster to an interference mitigation mode if the number of base stations included in the cluster is greater than a predetermined threshold.
Wherein the observation result information includes at least one of broadcast information detected in a peripheral wireless network and received signal strength of the broadcast information.
In addition,
And configured to form a cluster of the first base station by adding the first base station to a cluster of the interfering base station if it is determined based on the observation result information that there is an interfering base station interfering with the first base station Mitigation system.
And to combine clusters of each of the plurality of interfering base stations and to form a cluster of the first base station by adding the first base station to the merged cluster if the plurality of interfering base stations is a plurality.
In addition,
And based on the observation result information, if it is determined that there is no interfering base station interfering with the first base station, a cluster is created and a cluster of the first base station is formed by adding the first base station to the generated cluster Wherein the interference mitigation system comprises:
The subband allocation unit may further include:
The method comprising the steps of: dividing an entire band into subbands based on the number of base stations included in the cluster and using at least one of the divided subbands in at least one of the first base station and the second base station interfering with the first base station And to assign the searched subband to the first base station.
The subband allocation unit may further include:
And generates interference link information of the first base station and determines an allocation order i of the first base station based on the interference link information. When a subband for the (i-1) Band to the base station.
The subband allocation unit may further include:
And allocate to the first base station a subband in which the signal strength is measured to be lowest if the searched subband is absent.
Further comprising a frequency applicator configured to apply interference to the first base station and to apply the allocated sub-band to the first base station to mitigate interference.
The status confirmation unit observing a neighboring wireless network around the first base station to obtain wireless network observation result information;
Forming a cluster of the first base station based on the observation result information;
Determining a cluster mode of the cluster based on the number of base stations in the cluster; And
And allocating subbands to the first base station if the cluster mode is an interference mitigation mode,
Wherein determining the cluster mode comprises:
And setting the cluster to an interference mitigation mode if the number of base stations included in the cluster exceeds a predetermined threshold.
Wherein the observation result information includes at least one of broadcast information detected in a peripheral wireless network and received signal strength of the broadcast information.
Wherein forming the cluster comprises:
Determining, based on the observation result information, that there is an interfering base station interfering with the first base station; And
And adding the first base station to a cluster of the interfering base station if it is determined that the interfering base station is present.
Wherein the step of adding the first base station comprises:
Merging clusters of each of the plurality of interfering base stations and adding the first base station to the merged cluster if the plurality of interfering base stations is a plurality of interfering base stations.
Wherein forming the cluster comprises:
Determining, based on the observation result information, that there is an interfering base station interfering with the first base station; And
Generating a cluster and adding the first base station to the generated cluster if it is determined that the interfering base station does not exist.
The step of allocating the sub-
Dividing an entire band into subbands based on the number of base stations included in the cluster;
Searching for subbands not used by at least one of the first base station and the second base station interfering with the first base station among the divided subbands; And
And allocating the searched subband to the first base station.
The step of allocating the sub-
Generating interference link information of the first base station;
Determining an allocation rank i of the first base station based on the interference link information; And
allocating a subband for the first base station if a subband for the (i-1) th base station is assigned.
And allocating to the first base station a subband in which the signal strength is measured to be lowest if the searched subband is not present.
Further comprising: applying an assigned subband to the first base station to mitigate interference.
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| KR1020130115190A KR101530375B1 (en) | 2013-09-27 | 2013-09-27 | System and method for interference mitigation |
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| KR1020130115190A KR101530375B1 (en) | 2013-09-27 | 2013-09-27 | System and method for interference mitigation |
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| KR102073812B1 (en) * | 2019-08-19 | 2020-02-05 | 한화시스템(주) | Shared resource allocation method for avoiding a cluster interference in ad-hoc network |
| KR102291808B1 (en) * | 2019-12-18 | 2021-08-19 | 주식회사 엘지유플러스 | Method and apparatus for improving call quality of internet telephones |
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| JP5083232B2 (en) * | 2008-01-28 | 2012-11-28 | 富士通株式会社 | Interference mitigation method, radio communication system, and network manager |
| US20130005376A1 (en) * | 2011-06-30 | 2013-01-03 | Intel Corporation | Method and apparatus for interference mitigation in wireless systems |
| EP2568638A1 (en) * | 2011-09-09 | 2013-03-13 | Telefonaktiebolaget L M Ericsson (publ) | Device and method for handling interference at a receiver by activating interference cancellation according to the amount of most interfering neighbouring cells |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5083232B2 (en) * | 2008-01-28 | 2012-11-28 | 富士通株式会社 | Interference mitigation method, radio communication system, and network manager |
| KR20100062368A (en) * | 2008-12-02 | 2010-06-10 | 삼성전자주식회사 | A communication method of cooperation with base stations using clustering cooperation in a wireless communication network and a system thereof |
| US20130005376A1 (en) * | 2011-06-30 | 2013-01-03 | Intel Corporation | Method and apparatus for interference mitigation in wireless systems |
| EP2568638A1 (en) * | 2011-09-09 | 2013-03-13 | Telefonaktiebolaget L M Ericsson (publ) | Device and method for handling interference at a receiver by activating interference cancellation according to the amount of most interfering neighbouring cells |
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