KR20170115804A - Apparatus and Method for Analyzing Interference between Heterogeneous Wireless System considering Geographical Features - Google Patents

Abstract

The present invention relates to an interference analyzing apparatus for heterogeneous wireless systems considering features, comprising: a data loading unit for loading terrain information data; an analysis position setting unit for setting positions of an interference receiver, a transmitter, and an interference transmitter necessary for interference influence evaluation; A prediction technique providing unit for providing a technique for predicting an intensity of a received signal received from a transmitter and an intensity of an interference signal received from an interference transmitter in the interfered receiver in consideration of the influence of the feature, A signal size estimator for calculating the strength of the received signal and the interference signal using the provided prediction technique, and an interference estimator for estimating an interference effect of the interference transmitter on the interference receiver using the strength of the received signal and the strength of the interference signal, And an influence evaluation unit.

Description

TECHNICAL FIELD The present invention relates to an apparatus and method for analyzing interference between heterogeneous wireless systems considering features,

The present invention relates to an interference analysis technique, and more particularly, to an apparatus and method for providing accurate interference analysis results between heterogeneous wireless systems in order to efficiently use a limited frequency.

Although the use of a specific frequency band having an excellent propagation characteristic is increasing, the use of a new radio service to use the frequency band due to preemption of a frequency by existing radio service systems is limited, and since a higher frequency band is used, In terms of coverage, the efficiency of wireless communication is expected to decline.

Therefore, a technical proposal for minimizing the guard band and minimizing interference between heterogeneous services in a frequency band having excellent propagation characteristics should be presented, and accurate interference analysis technology can be a representative technical alternative.

The most commonly used methods for analyzing interference between existing wireless communication systems are MCL (Minimum Coupling Loss) method and Monte-Carlo method.

First, the MCL method uses the system parameters and the propagation model to calculate the activity factor of the transceiver by calculating the minimum distance that a plurality of systems must operate in order to operate without interference, that is, the distance or the separation frequency. Since the worst case in which a signal of a certain size is continuously received is ignored, a large separation distance or a separation frequency (guard band) is calculated to be inadequate for practical application. In practice, systems are operating normally with much less minimum frequency spacing and separation than the results obtained using the MCL method, so the adequacy of the worst results obtained through the MCL approach has been discussed.

Next, the Monte Carlo method specifies all parameter values related to the interference environment and statistically calculates the interference probability. It is a simulation method that simulates all the interference environments, although the complexity is rather large and the interference probability varies according to the input parameter value. There is an advantage to be able to do. In addition, when assigning a frequency to a new radio service system, it is possible to determine a frequency sharing possibility through interference analysis with a conventional radio communication system using the same band or adjacent band of the corresponding frequency, In order to present the technical parameters, a Monte Carlo method of interference analysis has been suggested.

However, the MCL (Minimum Coupling Loss) method and the Monte-Carlo method, which are used in the analysis of interference between different types of wireless communication devices, have a limitation in that they can not accurately consider the influence of features in a specific area.

The present invention provides an apparatus and method for evaluating the influence of interference between heterogeneous wireless systems considering the influence of features.

The present invention relates to an interference analyzing apparatus for heterogeneous wireless systems considering features, comprising: a data loading unit for loading terrain information data; an analysis position setting unit for setting positions of an interference receiver, a transmitter, and an interference transmitter necessary for interference influence evaluation; A prediction technique providing unit for providing a technique for predicting an intensity of a received signal received from a transmitter and an intensity of an interference signal received from an interference transmitter in the interfered receiver in consideration of the influence of the feature, A signal size estimator for calculating the strength of the received signal and the interference signal using the provided prediction technique, and an interference estimator for estimating an interference effect of the interference transmitter on the interference receiver using the strength of the received signal and the strength of the interference signal, And an influence evaluation unit.

According to one embodiment, the data loading unit loads the geographical information system data including the newly updated feature map in a map form.

According to one embodiment, the analysis position setting unit sets the position of the subject receiver and the transmitter to be fixed according to the input parameter, and sets the positions of the interference transmitter and the subject receiver to be fixed.

According to another embodiment, the analysis position setting unit sets the position of the interference transmitter and the interference receiver to be fixed, and the interference receiver is randomly generated according to the distribution input within the cell radius around the transmitter.

According to another embodiment, the analysis position setting unit sets the position of the subject receiver and the transmitter to be fixed, and sets the position of the interference transmitter to be randomly generated in accordance with the distribution input within the cell radius around the subject receiver or transmitter do.

According to another embodiment, the analysis position setting unit may generate randomly according to the distribution received by the subject receiver in the cell radius centering on the transmitter, and determine the position of the interference transmitter within the cell radius around the subject receiver or transmitter It is set to generate randomly according to the input distribution.

According to an embodiment, when using multiple antennas, the signal size estimator may expand the number of multiple antennas to calculate the size of a received signal and an interference signal.

According to one embodiment, the interference influence evaluator evaluates at least one of interference influence factors including interference probability, average transmission decrease rate, and capacity based on the calculated received signal and the interference signal.

A method for analyzing interference between heterogeneous wireless systems, the method comprising: loading terrain information data; setting location of an interference receiver, a transmitter, and an interference transmitter necessary for interference impact assessment; The method comprising the steps of: providing a technique capable of predicting the strength of a received signal received from a transmitter and the strength of an interference signal received from an interfering transmitter in consideration of the influence of the feature, And estimating an interference effect of the interference transmitter on the interference receiver using the strength of the received signal and the strength of the interference signal.

The present invention evaluates the influence of interference between heterogeneous wireless services using the same or adjacent bands considering the influence of topographical objects, so that it is possible to perform accurate interference analysis in a specific region or branch, thereby maximizing spectral efficiency. And provides a method for providing wireless service.

1 is a conceptual diagram of a link for explaining an interference effect between heterogeneous wireless systems.
FIG. 2 is a block diagram of an apparatus for analyzing interference between heterogeneous wireless systems considering features according to an embodiment of the present invention. Referring to FIG.
3 is a diagram showing examples of analysis position setting according to the present invention.
4 is a diagram illustrating an example of providing a prediction technique according to the present invention.
FIG. 5 is a diagram for explaining the concept of the adjacent band interference ratio used in calculating the interfering signal strength (IRSS) according to the present invention.
6 is a flowchart illustrating a method of analyzing interference between heterogeneous wireless systems in consideration of features according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout.

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

The terms used throughout the specification are defined in consideration of the functions in the embodiments of the present invention and can be sufficiently modified according to the intentions and customs of the user or the operator. It should be based on the contents of.

1 is a conceptual diagram of a link for explaining an interference effect between heterogeneous wireless systems.

Referring to FIG. 1, it is shown that networks 10 and 20 of different wireless systems are located at adjacent locations. Here, the links necessary for the interference analysis are the interference receiver 11, the transmitter 12, the interference transmitter 21, and the receiver 22. The strength of the signal received from the interfering receiver 11 by the interfering receiver 11 is defined as DRSS (Desired Receiving Signal Strength), and the intensity of the signal received from the interfering transmitter 21 by the interfering receiver 11 is Interfering Receiving Signal Strength (IRSS). At this time, the signal received from the interfering transmitter 11 by the interfering receiver 11 acts as a cause of the interference to the interfering receiver 11. The link between the subject receiver 11 and the transmitter 12 is defined as a subject interference link 13 and the link between the subject receiver 11 and the interference transmitter 21 is defined as an interference link 23 do.

FIG. 2 is a block diagram of an apparatus for analyzing interference between heterogeneous wireless systems considering features according to an embodiment of the present invention. Referring to FIG.

Referring to FIG. 2, an apparatus for analyzing interference between heterogeneous wireless systems considering features includes a data loading unit 110, an analysis location setting unit 120, a prediction technology providing unit 130 A signal size predicting unit 140, and an interference influence evaluating unit 150.

The data loading unit 110 loads the geographic information system (GIS) data including the newly updated feature map in a map form.

The analysis position setting unit 120 sets the positions of the interference receiver, the transmitter, and the interference transmitter necessary for the interference influence evaluation. A detailed description thereof will be given later with reference to Fig.

The prediction technique providing unit 130 provides a technology for predicting the size DRSS of the signal received from the transmitter and the size of the IRSS of the signal received from the interference transmitter in consideration of the influence of the feature in the interfered receiver. For example, a ray tracing method can be used as a propagation characteristic prediction method that is a prediction technique. This is a method in which the input environmental data is searched and summed by computer calculation using straight-line, reflection, transmission, and diffraction paths using the law of geometric optics. In addition, various algorithms such as a method of dividing a space in a search for a propagation path, a method using a ray tube, and the like may be included in order to reduce calculation time with a prediction technique. A detailed description thereof will be given later with reference to Fig.

The signal size predicting unit 140 calculates the intensity (DRSS) of the received signal received from the transmitter 12 by the receiver 12 using the input parameters and the provided prediction technique. Thereafter, the intensity (IRSS) of the interference signal received by the interference receiver 11 of the interference transmitter 21 is calculated. In addition, when using multiple antennas, the signal size predicting unit 140 calculates a size of a received signal and an interference signal by expanding the number of multiple antennas. A detailed description thereof will be described later with reference to Equation (1) to Equation (7).

The interference evaluation unit 150 evaluates interference effects of the interference transmitter 21 on the interference receiver 11 using the strength of the received signal and the strength of the interference signal. That is, the interference evaluation unit 150 evaluates at least one of the interference influence factors including the interference probability, the average transmission reduction rate, and the capacity based on the calculated reception signal and the interference signal.

3 is a diagram showing examples of analysis position setting according to the present invention.

Referring to FIG. 3, the analysis position setting unit 120 shows examples of four cases of setting positions of an interference receiver, a transmitter, and an interference transmitter. Referring to FIG. 3A, the analysis position setting unit 120 may set the position of the subject receiver and the transmitter to be fixed and the positions of the interference transmitter and the subject receiver to be fixed according to the input parameters. Referring to FIG. 3 (b), the analysis position setting unit 120 randomly generates the position of the interference transmitter and the interference receiver according to the distribution of the interference signal received within the cell radius around the transmitter, Can be set. Referring to FIG. 3 (c), the analysis position setting unit 120 determines whether the position of the interference receiver and the transmitter is fixed, and the position of the interference transmitter changes according to the distribution input in the cell radius around the interference receiver or transmitter. It can be set to occur randomly. Referring to FIG. 3 (d), the analysis position setting unit 120 randomly generates an interference receiver according to the distribution inputted within a cell radius centering on the transmitter, and the position of the interference transmitter detects the position of the interference receiver or transmitter It can be set to be randomly generated according to the input distribution within the cell radius as the center.

4 is a diagram illustrating an example of providing a prediction technique according to the present invention.

Referring to FIG. 4, a signal transmitted from a transmitter at a location of the generated interference receiver, a transmitter, and an interference transmitter is received at the interference receiver by surrounding features, an interference signal is transmitted at an interference transmitter, . Although only the reflected wave is illustrated in the drawing, signals by diffraction or transmission are also included in the present invention.

FIG. 5 is a diagram for explaining the concept of the adjacent band interference ratio used in calculating the interfering signal strength (IRSS) according to the present invention.

Referring to FIG. 5, a size of a neighboring band interference signal is determined according to a frequency response characteristic of a transmission filter of the interference transmitter and a reception filter of the interference receiver.

When calculating the strength (DRSS) of the received signal received from the transmitter 12 to the interfered receiver 11 in the signal size predicting unit 140 using the input parameters and the provided prediction technique, Can be used.

는 송신기의 공중선 출력이며,

는 전파의 파장(wavelength)이고,

는 파수(wave number)이다. 전파 경로 번호인

이 0인 경우는 직접파를 의미하며, 그 외의 값들은 전부 반사파(Reflection wave) 또는 회절파를 나타낸다.

은

번째 전파경로 상에 놓인 송신기와 피간섭수신 안테나 이득곱(Gain Product)의 평방근이며, 안테나의 지향성이 고려될 때 이는 송수신 안테나간의 상대적인 위치에 따라서 달라진다.

은 각 송신 안테나 소자에 해당되는 전파경로 상에서, 건물 또는 지면에 의해 반사된 반사파와 모서리에 의해 회절 된 각각의 반사계수와 회절계수를 반사회수 또는 회절회수만큼 곱한 경로 감쇄 계수를 나타낸다. 마지막으로

은 각 송신 안테나소자와

번째 수신 안테나간의 전파 경로 거리이다. here,

Is the antenna output of the transmitter,

Is the wavelength of the radio wave,

Is the wave number. The propagation path number

Is 0, it means a direct wave, and the other values represent a total reflection wave or a diffraction wave.

silver

Th propagation path and the gain product of the interference receiving antenna, and when the directivity of the antenna is considered, it depends on the relative position between the transmitting and receiving antennas.

Represents a path attenuation coefficient obtained by multiplying the reflection coefficient and the diffraction coefficient diffracted by the reflection wave and the edge reflected by the building or the ground on the propagation path corresponding to each transmission antenna element by the number of reflections or diffractions. Finally

Lt; RTI ID = 0.0 >

Lt; th > receive antennas.

번째 전파경로 상에서 경로 감쇄계수

는 <수학식 2>와 같다.Of the transmitting antenna element

Path propagation path < RTI ID = 0.0 >

Is expressed by Equation (2).

는

번째 전파경로에 대한 건물벽

에 해당되는 반사계수이다.

는 지면에 의한 반사 계수이다.

은 건물에 대한 회절계수를 나타낸다.

번째 전파경로에 대한 건물벽에 해당되는 반사계수

는 <수학식 3>과 같이 구할 수 있다.here,

The

Building wall for the third propagation path

.

Is the reflection coefficient by the ground.

Represents the diffraction coefficient for the building.

Reflection coefficient corresponding to the building wall with respect to the propagation path

Can be obtained as shown in Equation (3).

는 건물

의 상대 유전율이며 입사각은 다음의 <수학식 4>와 같이 표현될 수 있다. here

Building

And the incident angle can be expressed by Equation (4) below.

는 다음의 <수학식 5>와 같이 구할 수 있다.Here, the ground reflection coefficient

Can be obtained by the following Equation (5).

는 지면의 상대 유전율이며, 지면에 대한 입사각은 다음의 <수학식 6>과 같이 표현될 수 있다. here,

Is the relative permittivity of the ground, and the incident angle with respect to the ground can be expressed as Equation (6).

(IRSS) of the interference signal received by the interference receiver 11 of the interference transmitter 21 can be calculated as Equation (7).

는 송신기의 공중선 출력이며,

간섭 송신기의 정규화된 송신 스펙트럼을 나타내고,

는 희생 수신기의 정규화된 수신 필터 특성을 나타낸다.

는 피간섭 수신기와 간섭 송신기간 주파수 이격을 나타낸다.here,

Is the antenna output of the transmitter,

Represents the normalized transmit spectrum of the interfering transmitter,

Represents the normalized receive filter characteristic of the victim receiver.

Represents the interfering transmission period frequency spacing with the interfering receiver.

6 is a flowchart illustrating a method of analyzing interference between heterogeneous wireless systems in consideration of features according to an embodiment of the present invention.

Referring to FIG. 6, the apparatus loads the geographic information system (GIS) data including the newly updated feature in map form (S610). The device then sets the location of the interfering receiver, transmitter, and interfering transmitter necessary for interference impact assessment (S620). The analysis position setting unit 120 shows examples of four cases in which the positions of the subject interference receiver, the transmitter, and the interference transmitter are set. In the above four cases, for example, the positions of the subject receiver and the transmitter may be fixed according to the input parameters, and the positions of the interference transmitter and the subject receiver may be fixed. As another example, the interfering receiver may be randomly generated according to the distribution input within the cell radius around the transmitter, and the interfering transmitter and the interfering receiver may be fixed in position. As another example, the location of the interfering receiver and the transmitter may be fixed, and the location of the interfering transmitter may be set to occur randomly according to the distribution input within the cell radius centered on the interfering receiver or transmitter. As another example, the analysis position setting unit 120 may be configured such that the interference receiver is randomly generated according to the distribution inputted within the cell radius around the transmitter, and the position of the interference transmitter is input within the cell radius around the interference receiver or transmitter It can be set to occur randomly according to the distribution received.

The apparatus provides a technique for predicting the size of a signal received from a transmitter in a subject interfering receiver and the size of an IRSS of a signal received from the interfering transmitter in consideration of the influence of the feature in operation S630.

The apparatus calculates the received signal strength (DRSS) from the transmitter 12 to the interfered receiver 11 using the input parameters and the provided prediction technique (S640). Thereafter, the intensity (IRSS) of the interference signal received by the interference receiver 11 of the interference transmitter 21 is calculated. In addition, when using multiple antennas, the signal size predicting unit 140 calculates a size of a received signal and an interference signal by expanding the number of multiple antennas. A detailed description thereof is given above with reference to Equation (1) to Equation (7).

The apparatus evaluates the interference effect of the interference transmitter 21 on the interference receiver 11 using the calculated strength of the received signal and the intensity of the interference signal (S650). That is, the interference evaluation unit 150 evaluates at least one of the interference influence factors including the interference probability, the average transmission reduction rate, and the capacity based on the calculated reception signal and the interference signal.

Claims (16)

A data loading unit for loading the terrain information data,
An analysis position setting unit for setting positions of an interference receiver, a transmitter, and an interference transmitter necessary for interference influence evaluation;
A predictive technology providing unit for providing a technique capable of predicting the intensity of a received signal received from a transmitter and the intensity of an interference signal received from an interference transmitter in the interfered receiver in consideration of the influence of the feature,
A signal size predicting unit for calculating an intensity of the received signal and an interference signal by using the input parameter and the provided prediction technique,
And an interference effect evaluation unit for evaluating an interference effect of the interference transmitter on the interference receiver using the strength of the received signal and the strength of the interference signal.
The apparatus of claim 1, wherein the data loading unit
And the geographical information system data including the newly updated geographical information is loaded in a map form.
The apparatus according to claim 1, wherein the analysis position setting unit
Wherein the position of the interfering receiver and the position of the transmitter are fixed and the positions of the interfering transmitter and the interfering receiver are fixed according to the input parameters.
The apparatus according to claim 1, wherein the analysis position setting unit
Wherein the interfering receiver is randomly generated according to a distribution received within a cell radius centering on a transmitter, and sets the positions of the interfering transmitter and the interfering receiver to be fixed.
The apparatus according to claim 1, wherein the analysis position setting unit
Wherein the positions of the subject receiver and the transmitter are fixed and are set so that the position of the interference transmitter is randomly generated according to the distribution input within the cell radius centering the subject receiver or transmitter. Interference analyzer.
The apparatus according to claim 1, wherein the analysis position setting unit
The interfering receiver is randomly generated according to the distribution input in the cell radius around the transmitter and is set such that the position of the interfering transmitter is generated randomly according to the distribution input within the cell radius centering the interfering receiver or transmitter An apparatus for analyzing interference between heterogeneous wireless systems, characterized by features.
The apparatus of claim 1, wherein the signal size estimator
Wherein when the multiple antennas are used, the size of the received signal and the interference signal is calculated by extending the number of multiple antennas.
The apparatus of claim 1, wherein the interference influence evaluator
And estimating at least one of interference influence factors including interference probability, average transmission reduction rate, and capacity based on the calculated reception signal and interference signal.
Loading the terrain information data,
Setting the positions of the interference receiver, the transmitter, and the interference transmitter necessary for interference influence evaluation;
Providing a technique for predicting an intensity of a received signal received from a transmitter and an intensity of an interference signal received from an interference transmitter in the interfered receiver in consideration of the influence of the feature,
Calculating an intensity of the received signal and an interference signal using the input parameter and the provided prediction technique,
And evaluating interference effects of the interference transmitter on the interference receiver using the strength of the received signal and the strength of the interference signal.
10. The method of claim 9, wherein the loading step
And loading the geographical information system data including the newly updated geographical information into a map form.
10. The method of claim 9, wherein the setting comprises:
Wherein the position of the interfering receiver and the position of the transmitter are fixed and the positions of the interfering transmitter and the interfering receiver are fixed according to the input parameters.
10. The method of claim 9, wherein the setting comprises:
Wherein the interfering receiver is randomly generated according to a distribution received within a cell radius centering on a transmitter and is set such that the positions of the interference transmitter and the interfering receiver are fixed.
10. The method of claim 9, wherein the setting comprises:
Wherein the positions of the subject receiver and the transmitter are fixed and are set so that the position of the interference transmitter is randomly generated according to the distribution input within the cell radius centering the subject receiver or transmitter. Interference analysis method.
10. The method of claim 9, wherein the setting comprises:
The interfering receiver is randomly generated according to the distribution input in the cell radius around the transmitter and is set such that the position of the interfering transmitter is generated randomly according to the distribution input within the cell radius centering the interfering receiver or transmitter A method for analyzing interference between heterogeneous wireless systems considering feature features.
10. The method of claim 9, wherein the calculating step
Wherein when the multiple antennas are used, the sizes of the received signals and the interference signals are calculated by expanding the number of multiple antennas.
10. The method of claim 9, wherein the evaluating step
And evaluating at least one of interference influence factors including an interference probability, an average transmission reduction rate, and a capacity based on the calculated reception signal and the interference signal.

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