KR20210037270A - Communication apparatus for performing communication beam sweeping and control method thereof - Google Patents

Abstract

The present invention relates to a communication terminal performing communication beam sweeping and a control method thereof. The control method of a communication terminal according to the present invention includes the steps of determining a direction for each communication beam pattern formed by previously provided antennas at a current position and direction; Determining the strength of a signal received from a base station or a repeater for each communication beam pattern; Constructing a 3D map in which the received signal strength for each communication beam pattern determined in the step and the direction for each communication beam pattern determined in the step are mapped to 3D coordinates; When a direction change is detected by an already equipped sensor, a direction for each communication beam pattern is newly determined by referring to the changed direction, and the received signal strength corresponding to the newly determined direction for each communication beam pattern is determined by using the 3D map. After checking with reference, selecting a communication beam pattern corresponding to the largest received signal strength as a communication beam search target; And performing a communication beam search by preferentially using the communication beam search target selected in the above step.

Description

Communication terminal performing communication beam sweeping and its control method {COMMUNICATION APPARATUS FOR PERFORMING COMMUNICATION BEAM SWEEPING AND CONTROL METHOD THEREOF}

The present invention relates to a communication terminal performing communication beam sweeping and a control method thereof, and more particularly, to a communication terminal for quickly selecting an optimal communication beam for communication beam sweeping according to a change in direction, and a control method thereof.

In the 5G (Fifth Generation) communication field, communication is performed using a frequency band called mmWave (for example, 24GHz, 28GHz, etc.). At this time, the communication terminal is equipped with a plurality of antennas, and the phase difference is controlled by a plurality of antennas. Various radiation patterns are implemented.

Implementing such a radiation pattern is called beamforming.In order to increase the reception sensitivity of the antenna when performing beamforming, it is advantageous to increase the antenna array gain by reducing the beam width as much as possible. If made, the beam pattern is inevitably used to cover the entire direction that the antenna panel is responsible for.

However, in the case where one terminal can form various beam patterns, the key is to configure a communication channel using which beam pattern among them.

However, conventionally, a process of simply sequentially selecting a beam pattern or randomly selecting and comparing it is performed without efficient algorithm processing.

Specifically, it is as follows.

When a plurality of communication beam patterns can be formed by an antenna provided in the communication terminal, an index may be attached to each of them for convenience.

For example, if a communication beam pattern corresponding to a total of 10 indexes is possible, assuming that data communication is performed using a communication beam pattern corresponding to the current index 1, different indexes at each preset time (for example, 20 ms). It is checked whether the communication beam pattern of (for example, index 2) is suitable for data communication.This process can be referred to as a'communication beam search' process, and as a result of the determination, the communication beam pattern of another index is suitable for data communication. When it is determined, a corresponding communication beam pattern is set for data communication, and this process may be referred to as a'communication beam switching' process.

This communication beam search and communication beam switching are combined to be referred to as a'communication beam sweeping' process.

However, as described above, conventionally, when the communication beam pattern of index 1 is currently set for data communication, the communication beam pattern of index 2 is sequentially selected or a random communication beam pattern is selected at random and then the selected communication beam pattern is selected. When the strength of the received signal by the new communication beam pattern is greater by comparing the received signal strength by the communication beam pattern with the received signal strength by the communication beam pattern of the currently set index 1, communication beam switching is performed, and data communication in the future. In this, the new communication beam pattern was used.

However, if the strength of the received signal by the new communication beam pattern is smaller, the communication beam switching is not performed, and the strength of the received signal is used again after a preset time (for example, 20 ms) has elapsed. After determining, the process of comparing the intensity of the received signal according to the currently set communication beam pattern was repeated.

The following problems may occur in such a conventional processing method.

For example, a communication beam pattern corresponding to a total of 10 indices is possible, and in a state in which data communication is performed using the communication beam pattern of the current index 1, the location or direction of the communication terminal is changed. When the communication beam pattern is assumed to be suitable for data communication (i.e., when the intensity of the received signal by the communication beam pattern at index 10 is the largest), as described above, the communication beam patterns are sequentially advertised and compared. However, only after 200ms elapses, the optimal communication beam pattern is selected.

This time increases as the number of communication beam patterns increases, and accordingly, beam failure may occur.

Therefore, it is urgent to introduce a special algorithm that shortens the time for selecting an optimal communication beam pattern.

Publication Patent No. 10??2017??0096929

The present invention has been devised to meet the above-described conventional request, and an object thereof is to provide a communication terminal and a control method thereof for shortening time in performing communication beam sweeping.

In order to achieve the above object, a communication terminal for performing communication beam switching after repeatedly performing a communication beam search according to the present invention to select an optimal communication beam pattern, includes: a direction detection unit for determining a terminal direction; A beam pattern direction determining unit configured to determine a direction for each communication beam pattern formed by previously provided antennas with reference to the terminal direction; A signal strength determination unit for determining the strength of a signal received from a base station or a repeater for each communication beam pattern; A map construction unit configuring a 3D map in which the received signal strength for each communication beam pattern determined by the signal strength determination unit and a direction for each communication beam pattern determined by the beam pattern direction determination unit are mapped to 3D coordinates; When the direction detection unit detects a direction change and the beam pattern direction determination unit newly determines a direction for each communication beam pattern based on the changed direction, the received signal strength corresponding to the newly determined direction for each communication beam pattern A selection unit that checks with reference to the 3D map, and then selects a communication beam pattern corresponding to the largest received signal strength as a communication beam search target; And a communication beam sweeping processor that performs a communication beam search by preferentially using the communication beam search target selected by the selection unit.

In addition, in order to achieve the above object, the control method of a communication terminal performing communication beam switching after repeatedly performing a communication beam search according to the present invention to select an optimal communication beam pattern, is based on the current position and direction. Determining a direction for each communication beam pattern formed by the provided antennas; Determining the strength of a signal received from a base station or a repeater for each communication beam pattern; Constructing a 3D map in which the received signal strength for each communication beam pattern determined in the step and the direction for each communication beam pattern determined in the step are mapped to 3D coordinates; When a direction change is detected by an already equipped sensor, a direction for each communication beam pattern is newly determined by referring to the changed direction, and the received signal strength corresponding to the newly determined direction for each communication beam pattern is determined by using the 3D map. After checking with reference, selecting a communication beam pattern corresponding to the largest received signal strength as a communication beam search target; And performing a communication beam search by preferentially using the communication beam search target selected in the above step.

As described above, according to the present invention, after repeatedly performing a communication beam search to select an optimum communication beam pattern, a communication terminal performing communication beam switching can quickly select an optimum communication beam pattern.

That is, when a direction change occurs, each communication beam pattern is mapped to a pre-built 3D map to predict the received signal strength, and then the communication beam search is performed in the order of the communication beam pattern having the largest value. It is possible to significantly improve the probability of selecting a communication beam pattern having a good signal.

In particular, it is possible to minimize the frequency of occurrence of communication failure by allowing data communication to be performed quickly using a communication beam pattern having the best communication signal.

1 is a schematic configuration diagram of an entire system including a communication terminal according to an embodiment of the present invention,
2 is a functional block diagram of the communication terminal of FIG. 1,
3 is a diagram showing an example of a 3D map generated by the communication terminal of FIG. 2,
4 and 5 are a control flowchart of a communication terminal according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Hereinafter, each embodiment according to the present invention is merely an example for aiding understanding of the present invention, and the present invention is not limited to this embodiment. In particular, the present invention may be configured with a combination of at least one or more of individual configurations, individual functions, or individual steps included in each embodiment.

Particularly, for convenience, some claims in the claims include alphabets such as'(a)', but these alphabets do not prescribe the order of each step.

In addition, each signal referred to in each embodiment according to the present invention may mean one signal transmitted by one connection or the like, but may also mean a series of signal groups transmitted for the purpose of performing a specific function to be described later. . That is, in each embodiment, a plurality of signals transmitted at a predetermined time interval or transmitted after receiving a response signal from a counterpart device may be expressed as one signal name for convenience.

A schematic configuration of an entire communication system including the communication terminal 100 according to an embodiment of the present invention is as shown in FIG. 1.

As shown in the figure, the communication terminal 100 can communicate with a predetermined service providing server 200 via a base station or a repeater 200, and at this time, the communication terminal 100 forms a plurality of communication beam patterns. If this is possible, an optimal communication beam pattern may be selected from among them to communicate with the service providing server 200 via a base station or the like.

That is, when the communication terminal 100 communicates with the base station or the repeater 200, a communication beam pattern having the best reception sensitivity is selected and data communication is performed using the selected communication beam pattern.

At this time, switching the currently set communication beam pattern to another optimal communication beam pattern is referred to as communication beam sweeping.

Looking at the process of performing communication beam sweeping, a'communication beam search' process that determines the signal strength while receiving a communication signal received from the base station or the repeater 200 using a communication beam pattern different from the currently set communication beam pattern. And, when the signal strength determined by the corresponding communication beam search process is greater than the current received signal strength, the new communication beam pattern is set for data communication, and a'communication beam switching' process is performed.

In this way, when a plurality of antennas exist in the communication terminal 100, various communication beam patterns are formed through phase control of the plurality of antennas, data communication is performed using the formed communication beam patterns, and new Since switching to the communication beam pattern corresponds to a known technique, a more detailed description will be omitted.

As shown in FIG. 1, a plurality of antenna arrays may be built into the communication terminal 100, and various communication beam patterns may be formed by each of the antenna arrays.

In particular, the communication terminal 100 selects a communication beam pattern other than the communication beam pattern currently used for data communication at periodic time intervals (for example, 20 ms) to perform the above-described communication beam sweeping process (that is, the'communication beam search' process and , A'communication beam switching' process) is performed when a predetermined condition is satisfied, and it is important to quickly find an optimal communication beam pattern.

To this end, the communication terminal 100 collects data related to the received signal strength, and then performs communication beam sweeping by preferentially selecting a specific communication beam pattern using the previously collected data whenever the direction of the terminal changes.

A detailed functional block of the communication terminal 100 performing this function is as shown in FIG. 2.

As shown in the figure, the communication terminal 100 includes a beam pattern direction determination unit 110, a signal strength determination unit 120, a map construction unit 130, a direction detection unit 140, a selection unit 150, It may be configured to include a communication beam sweeping processing unit 160 and a storage unit 170.

First, the storage unit 170 may store applications and data necessary for the operation of the communication terminal 100, and further, data newly created or received from the outside during the operation of the communication terminal 100 may be stored.

In particular, the storage unit 170 may store a 3D map related to the received signal strength for each communication beam pattern generated by the map construction unit 130 as described later, and a more detailed description thereof will be provided later.

The direction detection unit 140 performs a function of determining the direction of the communication terminal 100, for example, using a geomagnetic sensor, an acceleration sensor, a tilt sensor, a gyro sensor, etc. to determine the horizontal and vertical directions, or The change in direction can be detected based on.

For example, the direction detection unit 140 may determine that the normal direction of the front surface of the communication terminal 100 is the direction of the corresponding communication terminal 100, and thus, when the communication terminal 100 is standing in a vertical direction, the communication terminal The direction of (100) may correspond to any one of the directions parallel to the horizontal plane, and when the communication terminal 100 is lying in a horizontal direction, the direction of the communication terminal 100 corresponds to any one of the directions parallel to the vertical plane. can do.

The direction of the communication terminal 100 in the three-dimensional space may be displayed as an angle based on the x-axis, y-axis, and z-axis that are orthogonal to each other.

The beam pattern direction determination unit 110 performs a function of determining a direction for each communication beam pattern formed by previously provided antennas with reference to the direction of the communication terminal 100, that is, a'terminal direction'.

For example, a direction for each communication beam pattern with respect to the front of the communication terminal 100 may be predefined, and the beam pattern direction determination unit 110 changes the direction of the communication terminal 100 whenever the direction of the communication terminal 100 changes. It is possible to determine the direction of each communication beam pattern corresponding to.

Here, the communication beam pattern is formed according to the phase difference control of the plurality of antennas, and the direction of the communication beam pattern refers to a main direction in which communication is best performed by the corresponding communication beam pattern.

The signal strength determination unit 120 performs a function of determining the strength of a signal received from the base station or the repeater 200 for each communication beam pattern. For example, the signal strength determination unit 120 may determine the signal strength for each SSB (Synchronization Signal Block) index transmitted by the base station, but determining the strength of a signal received from the base station or the repeater 200 itself is known. Since it corresponds to the technology, a more detailed description will be omitted.

The map construction unit 130 maps the received signal strength for each communication beam pattern determined by the signal strength determination unit 120 and the direction for each communication beam pattern determined by the beam pattern direction determination unit 110 to 3D coordinates. Performs the function of constructing the 3D map.

That is, the communication terminal 100 may perform a communication beam search at intervals of a periodic time (for example, 20 ms), and at this time, the signal strength determination unit 120 may perform a received signal for each communication beam pattern determined by performing a communication beam search. Is determined, and the map construction unit 130 matches the received signal strength for each communication beam pattern determined in this way with the direction for each communication beam pattern determined by the beam pattern direction determination unit 110 It is to construct the 3D map shown in.

An example of a 3D map constructed in this manner is shown in FIG. 3.

As shown in FIG. 3, the 3D map may have a shape of a sphere. The normal direction of each cell included in the sphere shape corresponds to the direction of each communication beam pattern, and the color or brightness of each cell corresponds to the received signal strength. It may correspond to.

Of course, FIG. 3 is only shown to aid understanding, and it goes without saying that the intensity of the received signal and the direction of the communication beam pattern may be mapped as numbers in the 3D table.

In particular, the map construction unit 130 performs a normalization process in which the received signal strength for each communication beam pattern determined by the signal strength determination unit 120 is divided by a gain value corresponding to the antennas forming the corresponding communication beam pattern. Thereafter, a 3D map in which the normalized value and the direction of each communication beam pattern determined by the beam pattern direction determination unit 110 are mapped to 3D coordinates may be configured.

For example, if the total gain of the first antenna array composed of dipole antennas in the communication terminal 100 is 8 dB and the total gain of the second antenna array composed of patch antennas is 11 dB, the map construction unit 130 The received signal strength received by the communication beam pattern formed by the array is normalized by dividing the total gain of the first antenna array by 8, and the received signal strength received by the communication beam pattern formed by the second antenna array is It can be normalized by dividing the total gain of the second antenna array by 11.

For a specific example, when a plurality of communication beam patterns can be formed by an antenna provided in the communication terminal 100, an index may be attached to each of them for convenience. In the case of formation, each of them can be referred to as a first communication beam pattern, a second communication beam pattern, a third communication beam pattern, a fourth communication beam pattern, and a fifth communication beam pattern. When the beam pattern is formed, each of them may be referred to as a sixth communication beam pattern, a seventh communication beam pattern, an eighth communication beam pattern, a ninth communication beam pattern, and a tenth communication beam pattern. If the strength of the received signal received by the received signal is '16', the map construction unit 130 divides it by 8, the total gain of the first antenna array, and a normalized value '2' (16dB / 8dB = 8dB in the case of dB) Can be calculated.

Similarly, if the strength of the received signal received by the second communication beam pattern is '24', the map construction unit 130 divides it by 8, the total gain of the first antenna array, and a normalized value of '3' (in dB units). If 24dB /8dB = 16dB) can be calculated.

As another example, if the strength of the received signal received by the sixth communication beam pattern is '22', the map construction unit 130 divides it by the total gain of the second antenna array of 11 and the normalized value '2' ( In the case of dB unit, 22dB /11dB = 11dB) can be calculated, and if the strength of the received signal received by the seventh communication beam pattern is '33', the map construction unit 130 determines the total gain of the second antenna array. The normalized value '3' (in the case of a dB unit, 33dB /11dB = 22dB) can be calculated by dividing it by 11.

Here, the total gain of each antenna array may be a sum of'individual gain' corresponding to each of the antennas included in the corresponding antenna array and'array gain' corresponding to the antenna array.

For example, when the above-described first antenna array is composed of 4 dipole antennas, the second antenna array is composed of 4 patch antennas, the gain of each dipole antenna is 2dB, and the gain of each patch antenna is 5dB, the first The antenna array gain and the second antenna array gain may be 6dB, in which case the total gain of the first antenna array is 8dB (=2+6), and the total gain of the third antenna array is 11dB (=5+6). It can be.

The 3D map configuration of the map construction unit 130 may be periodically updated (i.e., the value of each existing cell, that is, the received signal strength or the normalized value is updated, or a cell in a new direction is added). For example, as will be described later, the communication beam sweeping processor 160 may perform communication beam switching or update the map configuration whenever the direction of the communication terminal 100 changes.

That is, the map construction unit 130 normalizes the intensity of the received signal detected in each direction in the 3D space (i.e., corresponding to the direction of each communication beam pattern) and then normalizes the corresponding direction (i.e., the direction of each communication beam pattern). ), you can update it.

On the other hand, as the direction detection unit 140 detects the direction change of the communication terminal 100, the selection unit 150 determines the direction of the changed communication terminal 100 by the beam pattern direction determination unit 110 as described above. When the direction for each communication beam pattern is newly determined based on the direction, after checking the received signal strength corresponding to the newly determined direction for each communication beam pattern with reference to the 3D map, communication corresponding to the largest received signal strength It performs a function of selecting a beam pattern as a communication beam search target.

In particular, when the intensity of the received signal is normalized in the 3D map as described above, the selection unit 150 corresponds to the direction of each communication beam pattern newly determined by the beam pattern direction determination unit. After calculating the received signal strength by referring to the 3D map and the gain for each communication beam pattern, a communication beam pattern corresponding to the largest received signal strength may be selected as a communication beam search target.

For example, in FIG. 3, the normalized value mapped to cell a is 6, the normalized value mapped to cell b is 4, the total gain of the communication beam pattern corresponding to the direction of cell a is 2dB, and cell b When the total gain of the communication beam pattern corresponding to the direction of is 8dB, the selection unit 150 predicts that the received signal strength corresponding to cell a is 12 (=6*2), while the received signal strength corresponding to cell b Is expected to be 32 (=4*8), and out of the two, since cell b has a larger value, it can be determined that a communication beam pattern having a direction corresponding to cell b is a target to preferentially perform a communication beam search. There is.

This process may be performed for all cells, and in the end, after the selection unit 150 selects a cell with the largest reception signal expected value, the communication beam pattern corresponding to the cell may be selected as the highest priority communication beam search target. .

The communication beam sweeping processing unit 160 performs a function of performing a communication beam search by preferentially using the communication beam search target selected by the selection unit 150. Further, the communication beam sweeping processing unit 160 preferentially uses the communication beam search target selected by the selection unit 150 to perform a communication beam search, and as a result, is received from the base station or the repeater 200 by the corresponding communication beam search target. When the strength of the signal is greater than the strength of the signal received from the base station or the repeater 200 according to the current communication beam pattern, communication beam switching is performed, that is, the communication beam pattern corresponding to the communication beam search target is transmitted to the communication data. It is to perform the function to set for.

For example, if any one of the remaining communication beam patterns other than the communication beam pattern currently set for data communication among the communication beam patterns available at a preset time (for example, 20 ms) is selected as a communication beam search target, the communication beam switching processing unit The communication beam search processing using the selected communication beam pattern is performed, and communication beam switching processing is performed when the above-described predetermined condition is satisfied.

If a plurality of communication beam patterns are possible, selecting any one of them to perform the above-described communication beam sweeping process (communication beam search or/and communication beam switching) is itself a known technique, so a more detailed description is omitted. do.

Meanwhile, in the above-described embodiment, the communication beam sweeping processing unit 160 and the signal strength determining unit 120 are separated for better understanding, but the signal strength determining unit 120 may be included as a part of the communication beam sweeping processing unit 160. Of course there is.

Hereinafter, a control process of the communication terminal 100 according to an embodiment of the present invention will be described with reference to FIGS. 4 and 5.

First, a process of constructing a 3D map in which received signal strengths for each communication beam pattern are mapped will be described with reference to FIG. 4.

First, the communication terminal 100 determines its initial direction (step S1).

For example, the user's initial direction may be determined according to a user's request or at the time of booting after power-on.

Since the initial direction is a reference direction for determining the degree to which the direction of the communication terminal 100 changes in the future, it does not necessarily have to be an exact absolute direction, but may correspond to a virtual direction.

The communication terminal 100 determines a direction for each communication beam pattern based on the initial direction, and in this case, the direction for each communication beam pattern previously registered with respect to the front of the communication terminal 100 may be referred to (step S3).

Subsequently, the communication terminal 100 determines the signal strength for each communication beam pattern, that is, the received signal strength for the communication signal transmitted by the base station or the repeater 200 (step S5), and calculates the determined received signal strength for each communication beam. A normalized value is calculated by dividing it by the total gain for each pattern (step S7).

Thereafter, the communication terminal 100 constructs a three-dimensional map in which the directions for each communication beam pattern and the above-described normalized value are mapped (step S9). As described above, the normal direction of each cell of the 3D map may correspond to the direction of each communication beam pattern.

This process may be continuously performed at preset time intervals even when the communication terminal 100 does not change direction.

Meanwhile, FIG. 5 shows a process performed when the direction of the communication terminal 100 is changed while the 3D map is configured as shown in FIG. 4.

The communication terminal 100 may change its direction (for example, the direction in which the front of the communication terminal 100 faces), such as changing the direction in which the user carrying the communication terminal 100 moves or changing the direction he is holding. At this time, when such a direction change is detected (step S11), the communication terminal 100 determines a newly switched direction for each communication beam pattern (step S13), and then selects an optimal communication beam pattern using a three-dimensional map (step S11). S15).

For example, as described above, each cell corresponding to a specific direction may exist in the 3D map. In this case, a normalized value mapped to a cell having a direction coincident with or most similar to the direction of each communication beam pattern and the corresponding The received signal strength for each communication beam pattern is predicted by multiplying the total gain of the communication beam pattern, and the communication beam pattern having the largest value among the predicted received signal strengths is selected as the optimal communication beam pattern (i.e., communication beam search priority It can be selected as a target).

Subsequently, the communication terminal 100 performs a communication beam search using the selected communication beam pattern (step S17), which means a process of receiving a signal from an actual base station or repeater 200 using the corresponding communication beam pattern. .

As a result of performing a communication beam search, when the received signal strength received and measured by the new communication beam pattern is greater than the received signal strength received and measured by the existing communication beam pattern (step S19), the communication terminal 100 switches the communication beam. Is performed (step S21).

That is, in the future data communication, it is performed using a new communication beam pattern.

Of course, if the received signal strength received and measured by the new communication beam pattern as a result of performing the communication beam search is not greater than the received signal strength received and measured by the existing communication beam pattern, the communication terminal 100 is For example, after 20 ms), a communication beam pattern predicted to have a high received signal strength may be selected as a communication beam search priority target, and the above-described communication beam search/communication beam switching process may be performed.

Meanwhile, it goes without saying that the process of performing each of the above-described embodiments may be performed by a program or application stored in a predetermined recording medium (eg, computer-readable). Here, the recording medium includes all of an electronic recording medium such as a random access memory (RAM), a magnetic recording medium such as a hard disk, and an optical recording medium such as a compact disk (CD).

In this case, the program stored in the recording medium may be executed on hardware such as a computer or a smart phone to perform each of the above-described embodiments. In particular, at least one of the functional blocks of the communication terminal according to the present invention described above may be implemented by such a program or application.

In addition, the present invention is not limited to the specific embodiments described above, but can be implemented by various modifications and modifications without departing from the gist of the present invention. It will be apparent that such modifications and modifications are included in the present invention if they fall within the appended claims.

100: communication terminal 200: base station or repeater
300: service providing server 110: beam pattern direction determination unit
120: signal strength determination unit 130: map construction unit
140: direction detection unit 150: selection unit
160: communication beam sweeping processing unit 170: storage unit

Claims (10)

In the control method of a communication terminal performing communication beam switching after repeatedly performing a communication beam search to select an optimal communication beam pattern,
(a) determining a direction for each communication beam pattern formed by previously provided antennas at a current position and direction;
(b) determining the strength of a signal received from a base station or a repeater for each communication beam pattern;
(c) constructing a 3D map in which the received signal strength of each communication beam pattern determined in step (b) and the direction of each communication beam pattern determined in step (a) are mapped to 3D coordinates;
(d) When a direction change is detected by an already equipped sensor, the direction of each communication beam pattern is newly determined by referring to the changed direction, and the received signal strength corresponding to the newly determined direction of each communication beam pattern is determined by the 3 After checking with reference to the dimensional map, selecting a communication beam pattern corresponding to the largest received signal strength as a communication beam search target;
(e) performing a communication beam search by preferentially using the communication beam search target selected in step (d). The method of claim 1,
In step (e), as a result of performing a communication beam search using the communication beam search target selected in step (d), the strength of the signal received from the base station or the repeater by the communication beam search target is current. A control method of a communication terminal performing communication beam sweeping, comprising performing communication beam switching using a communication beam search target when the strength of a signal received from a base station or a repeater is greater according to a communication beam pattern. The method of claim 2,
In step (c), after performing a normalization process in which the received signal strength for each communication beam pattern determined in step (b) is divided by a gain value corresponding to the antennas forming the corresponding communication beam pattern, the corresponding normal A control method of a communication terminal performing communication beam sweeping, comprising configuring a 3D map in which the risen value and the direction of each communication beam pattern determined in step (a) are mapped to 3D coordinates. The method of claim 2,
After the step (e), the control method of the communication terminal performing communication beam sweeping, characterized in that repeatedly performing the step (c). A computer-readable recording medium on which a program for executing the method of any one of claims 1 to 4 is recorded. An application program stored in a computer-readable recording medium to execute the method of any one of claims 1 to 4 in combination with hardware. In a communication terminal that repeatedly performs a communication beam search to select an optimal communication beam pattern, and then performs communication beam switching,
A direction detection unit for determining a terminal direction;
A beam pattern direction determining unit configured to determine a direction for each communication beam pattern formed by previously provided antennas with reference to the terminal direction;
A signal strength determination unit for determining the strength of a signal received from a base station or a repeater for each communication beam pattern;
A map construction unit configuring a 3D map in which the received signal strength for each communication beam pattern determined by the signal strength determination unit and a direction for each communication beam pattern determined by the beam pattern direction determination unit are mapped to 3D coordinates;
When the direction detection unit detects a direction change and the beam pattern direction determination unit newly determines a direction for each communication beam pattern based on the changed direction, the received signal strength corresponding to the newly determined direction for each communication beam pattern A selection unit that checks with reference to the 3D map and selects a communication beam pattern corresponding to the largest received signal strength as a communication beam search target;
And a communication beam sweeping processor that performs a communication beam search by preferentially using the communication beam search target selected by the selection unit. The method of claim 7,
As a result of performing a communication beam search using the communication beam search target selected by the selection unit, the communication beam sweeping processing unit, the strength of the signal received from the base station or the repeater by the communication beam search target is the current communication beam. A communication terminal performing communication beam sweeping, comprising performing communication beam switching using a communication beam search target when the strength of a signal received from a base station or a repeater is greater according to a pattern. The method of claim 8,
The map construction unit performs a normalization process in which the received signal strength for each communication beam pattern determined by the signal strength determination unit is divided by a gain value corresponding to antennas forming a corresponding communication beam pattern, and then the normalized Construct a 3D map in which a value and a direction of each communication beam pattern determined by the beam pattern direction determination unit are mapped to 3D coordinates,
The selection unit calculates the received signal strength corresponding to the direction of each communication beam pattern newly determined by the beam pattern direction determination unit by referring to the 3D map and the gain for each communication beam pattern, and then the communication corresponding to the largest received signal strength. A communication terminal performing communication beam sweeping, characterized in that selecting a beam pattern as a communication beam search target. The method of claim 8,
After the communication beam switching is performed by the communication beam sweeping processing unit, the map construction unit includes a direction for each communication beam pattern newly determined by the beam pattern direction determination unit and a received signal for each communication beam pattern determined by the signal strength determination unit. A communication terminal performing communication beam sweeping, wherein the 3D map is updated using intensity.

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