KR20210047174A - Beamforming controller and beamforming control method - Google Patents

Abstract

The present invention discloses a technology capable of optimizing a beam direction in each remote device even if the same beam ID is provided to each remote device when operating a distributed antenna termination (remote device) for an in-building solution. To this end, a beamforming control device comprises a beam identifier changing unit and a beam forming unit.

Description

Beamforming control device and beamforming control method {BEAMFORMING CONTROLLER AND BEAMFORMING CONTROL METHOD}

The present invention is a technology related to an in-building solution, and more particularly, a distributed solution for in-building solution. When operating the antenna terminal (Remote equipment), It relates to a technology capable of optimizing a channel with a remote device and a terminal.

In the 5G NR system that uses a higher center frequency than the conventional 4G LTE/LTE-Advanced System, it is expected that it will be difficult to provide good service quality in the in-building as attenuation due to path-loss and outdoor to indoor (O2I) attenuation increase. to be.

Accordingly, there is an urgent need to develop a solution to provide service coverage in the in-building, and various in-building solutions to solve the problem are being studied.

Among the in-building solutions, the method of using a repeater is the method of using a repeater. In the case of the in-building solution, in order to cover a large area or building with one equipment (repeater), DAS (Distributed Antenna System) or AAU (Active Antenna Unit) Remote equipment such as, etc. is operated as a terminal (antenna terminal) to amplify the mobile communication signal transmitted from the same base station and transmit it to multiple antennas and antenna units.

In the case of an in-building solution using a repeater, the downlink (DL) signal radiated from each antenna end is the same base station signal, and the uplink (UL) signal is sent back to the base station by adding all the signals received at each antenna end. do.

At this time, the method of radiating the same base station signal at the end of each antenna is a method called signal copy, and in the in-building solution, macro base station equipment is added by using a copy signal copied by this signal copy method. It is possible to implement wide coverage by simply distributing the same signal widely without installing it.

However, the coverage extension using such a copy signal has a disadvantage that it is difficult to apply to a signal in the mm Wave band using beamforming.

Specifically, in a repeater system using a copy signal, since each antenna end radiates the same base station signal copied, the Beam ID for beamforming also uses the same ID given by the base station. All beam directions at each end of the antenna become the same according to the same Beam ID.

In this way, if the antenna beams are formed in the same direction according to the same Beam ID regardless of the location of the terminal at each of the distributed antenna ends, the channel between the distributed antenna ends and the terminal cannot be optimized. The system performance of the system is bound to be limited.

Accordingly, in the present invention, when operating a distributed antenna terminal (remote equipment) for an in-building solution, it is intended to propose a method for optimizing a channel with a distributed remote device and a terminal.

The present invention was created in view of the above circumstances, and an object to be reached in the present invention is to optimize a channel with a distributed remote device and a terminal when operating a distributed antenna terminal (remote device) for an in-building solution. We want to realize a solution that can be done

The beamforming control apparatus according to the first aspect of the present invention for achieving the above object, in relation to two or more radio modules receiving the same beam identifier indicating a beam direction, the received beam identifier from each of the radio modules. A beam identifier changing unit for changing to be different from the beam identifiers of other radio modules in the at least two radio modules; And a beam forming unit configured to form an antenna beam beamformed in a beam direction according to a beam identifier changed in each of the wireless modules.

Specifically, the beam identifier changing unit may change the beam identifier provided to the radio module by using an offset value preset in the radio module.

Specifically, in relation to the two or more radio modules, each radio module checks the radio channel quality between the radio module and the terminal by interworking with a terminal within the coverage of the radio module, and based on the identified radio channel quality, the beam It may further include an offset value setting unit for setting an optimum offset value for use in the identifier change.

Specifically, the offset value setting unit repeats a process of setting an offset value in the wireless module and confirming the radio channel quality when forming an antenna beam according to the changed beam identifier using the set offset value, and the radio channel in the radio module A specific offset value whose quality is equal to or greater than a predefined threshold quality may be set as an optimal offset value.

Specifically, the offset value setting unit may adjust a setting period for setting the optimum offset value in the wireless module according to whether the terminal within the coverage of the wireless module moves or stays.

Specifically, the offset value setting unit may determine whether the terminal within the coverage of the wireless module moves or stays based on the amount of change between the optimal offset values previously set in the wireless module.

Specifically, the two or more wireless modules may be remote devices installed in an in-building and receiving a copy signal including a beam identifier from an upper end of the wireless module.

A beamforming control method operating in a wireless module according to a second aspect of the present invention for achieving the above object includes a beam identifier indicating a beam direction provided from an upper end, and two or more wireless modules receiving the same beam identifier. A beam identifier changing step of changing the beam identifier to be different from the beam identifier of the other radio module within; And a beam forming step of forming an antenna beam beamformed in a beam direction according to the changed beam identifier.

Specifically, in the step of changing the beam identifier, the beam identifier provided to the wireless module may be changed using a preset offset value.

Specifically, an offset that checks the quality of a radio channel between the radio module and the terminal by interworking with a terminal within the coverage of the radio module, and sets an optimal offset value for use in changing the beam identifier based on the identified radio channel quality. A value setting step may be further included.

Specifically, in the offset value setting step, the process of checking the radio channel quality when forming the antenna beam according to the beam identifier changed by using the offset value setting and the set offset value is repeated, so that the radio channel quality in the radio module is A specific offset value equal to or higher than a predefined threshold quality may be set as an optimal offset value.

Specifically, further comprising a determining step of determining whether the terminal within the coverage of the wireless module moves or resides; In the offset value setting step, a setting period for setting an optimum offset value in the wireless module may be adjusted according to a determination result of the determination step.

The computer program according to the third aspect of the present invention for achieving the above object is combined with hardware to provide a beam identifier indicating a beam direction provided from an upper end, and other two or more radio modules receiving the same beam identifier. Changing to be different from the beam identifier of the wireless module; And forming the beamformed antenna beam in the beam direction according to the changed beam identifier.

Accordingly, according to the beamforming control apparatus and beamforming control method of the present invention, when operating a distributed antenna termination (remote equipment) for an in-building solution, even if the same Beam ID is provided to each remote equipment, the beam direction is determined by each remote equipment. By optimizing, it is possible to realize a method for optimizing channels with distributed remote equipment and terminals.

For this reason, in the present invention, when operating a distributed antenna terminal (remote equipment) for an in-building solution, it is possible to derive an effect of improving the system performance of the in-building solution.

FIG. 1 shows an example of forming an antenna beam in the same beam direction according to the same Beam ID at each antenna terminal (Remote equipment).
2 is a block diagram showing the configuration of a beamforming control apparatus according to an embodiment of the present invention.
3 is an exemplary diagram showing a circuit configuration of a wireless module (Remote equipment) in which a beamforming control apparatus according to an embodiment of the present invention is implemented.
4 shows an example of forming antenna beams of different beam directions even if the same Beam ID is provided at each antenna terminal (Remote equipment).
5 is a flowchart illustrating an operation flow of a method for controlling beamforming according to an embodiment of the present invention.

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

The present invention relates to an in-building solution technology.

The method of using a repeater among in-building solutions is to terminate remote equipment such as DAS (Distributed Antenna System) or AAU (Active Antenna Unit) in order to cover a large area or building with one equipment (repeater). The mobile communication signal transmitted from the same base station is amplified and transmitted to a plurality of antennas and antenna units.

In the case of an in-building solution using a repeater, the downlink (DL) signal radiated from each antenna end (remote equipment) is the same base station signal, and the uplink (UL) signal is the sum of the signals received from each antenna end. It is passed back to the base station.

At this time, the method of radiating the same base station signal at the end of each antenna is a method called signal copy, and in the in-building solution, macro base station equipment is added by using a copy signal copied by this signal copy method. It is possible to implement wide coverage by simply distributing the same signal widely without installing it.

However, the coverage extension using such a copy signal has a disadvantage that it is difficult to apply to a signal in the mm Wave band using beamforming.

In FIG. 1, a base station module (CU: Central Unit) and a radio module (DU: Distributed Unit) are separated from each other. It shows an in-building solution that is divided into a wireless module (DU_H) and a lower wireless module (DU_L) and used as an end of each antenna in which remote equipment corresponding to the lower wireless module (DU_L) is distributed.

Referring to FIG. 1, in a repeater system using a copy signal, each antenna end, that is, each sub-radio module (DU-L #1 Beam-former,... DU-L #N Beam- former) is transmitted from the upper wireless module (DU_H), which is the same in each distributed lower wireless module (DU-L #1 Beam-former,... DU-L #N Beam-former). It emits a base station signal.

For this reason, in each of the distributed sub-radio modules (DU-L #1 Beam-former, ... DU-L #N Beam-former), the beam identifier for beamforming, that is, the Beam ID is also the base station end, that is, the base station module (CU ), the same ID (e.g. Beam ID 1) is used, so all of the distributed sub-radio modules (DU-L #1 Beam-former,... DU-L #N Beam-former) The beam direction is the same according to the same Beam ID (eg, Beam ID 1).

Thus, as shown in FIG. 1, in each distributed antenna termination, that is, each sub-radio module (DU-L #1 Beam-former, ... DU-L #N Beam-former), regardless of the location of the terminal When all antenna beams are formed in the same direction according to the same Beam ID (e.g., Beam ID 1), distributed antenna terminations ((DU-L #1 Beam-former,... DU-L #N Beam-former) And the channel between the terminals cannot be optimized, and eventually the system performance of the in-building solution is inevitably limited.

Accordingly, in the present invention, when operating a distributed antenna terminal (remote equipment) for an in-building solution, it is intended to propose a method for optimizing a channel with a distributed remote device and a terminal.

Specifically, in the present invention, when operating a distributed antenna termination (remote device) for an in-building solution, even if the same Beam ID is provided to each remote device, the beam direction is optimized in each remote device, and the distributed remote device and terminal We propose a technology that can optimize the channel of the network.

Hereinafter, a beamforming control apparatus according to an embodiment of the present invention will be described in detail with reference to FIG. 2.

As shown in FIG. 2, the beamforming control apparatus 100 according to an embodiment of the present invention includes a beam identifier changing unit 110 and a beam forming unit 130.

Furthermore, the beamforming control apparatus 100 of the present invention may further include an offset value setting unit 120.

All or at least a part of the configuration of the beamforming control apparatus 100 may be implemented in the form of a hardware module or a software module, or may be implemented in a form in which a hardware module and a software module are combined.

Here, the software module may be understood as, for example, an instruction executed by a processor that controls an operation in the beamforming control device 100, and such a command has a form mounted in a memory in the beamforming control device 100. I will be able to.

As a result, the beamforming control apparatus 100 according to an embodiment of the present invention determines the beam direction in each remote device even if the same Beam ID is provided to each remote device, that is, a new technology proposed by the present invention through the above-described configuration. A technique for optimizing is realized, and each configuration in the beamforming control apparatus 100 for realizing this will be described in more detail below.

Prior to a detailed description, the beamforming control apparatus 100 of the present invention may be implemented at each antenna end (eg, a remote device), or may be a separate device interlocking with each antenna end and its upper end tube.

However, in the following, for convenience of description, it is assumed that the beamforming control apparatus 100 of the present invention is implemented at each antenna terminal (eg, remote device).

In relation to two or more radio modules receiving the same beam identifier indicating a beam direction, the beam identifier changing unit 110 may convert the beam identifier provided from each of the radio modules to the beam of another radio module in the at least two radio modules. Responsible for changing the identifier to be different.

Here, two or more wireless modules that receive the same beam identifier indicating the beam direction, that is, the Beam ID, are installed in the in-building, and the remote device that receives the copy signal including the beam identifier, that is, the Beam ID from the top of the wireless module, Means the antenna termination.

Accordingly, assuming an in-building solution using the distributed lower wireless module (DU_L) as a terminal, that is, as a remote device, referring to FIG. 1, two or more wireless modules receive a copy signal copied from the upper part, that is, the upper wireless module (DU_H). Accordingly, it corresponds to the end of each antenna that receives the same Beam ID included in the copy signal, that is, each distributed sub-radio module (DU-L #1 Beam-former,... DU-L #N Beam-former). .

Hereinafter, for convenience of description, as two or more wireless modules, each distributed sub-radio module (DU-L #1 Beam-former,... DU-L #N Beam-former) will be described.

And, for convenience of explanation, it is assumed that the beamforming control apparatus 100 of the present invention is implemented in each antenna terminal (eg, remote device).

Representatively referring to the first sub-radio module (DU-L #1 Beam-former) among the distributed sub-radio modules (DU-L #1 Beam-former,... DU-L #N Beam-former), the first The description will be made on the assumption of the beamforming control apparatus 100 implemented in the lower wireless module (DU-L #1 Beam-former).

According to this assumption, the beam identifier changing unit 110, the beam ID provided from the upper, that is, the upper wireless module (DU_H) in the lower wireless module (DU-L #1 Beam-former), each distributed lower wireless module ( DU-L #1 Beam-former,... DU-L #N Beam-former, other sub-radio modules other than itself (DU-L #2 Beam-former,... DU-L #N Beam-former) ) Can be changed to be different from the Beam ID.

Hereinafter, an embodiment of changing the Beam ID provided from the upper end, that is, the upper wireless module DU_H will be described in detail.

According to a specific embodiment, the beam identifier changing unit 110 is preset in a wireless module, that is, a lower wireless module (DU-L #1 Beam-former) as an antenna termination in which the beamforming control apparatus 100 of the present invention is implemented. By using the offset value, the beam identifier provided to the lower wireless module (DU-L #1 Beam-former), that is, the Beam ID can be changed.

In general, when the beam ID covers +/- 120 deg, 16 to 64 beam IDs can be used, and the direction of the beam is indicated according to a value defined as binary for each beam ID.

As described above, in the present invention, each lower wireless module (DU-L #1 Beam-former, which receives a copy signal copied from the upper, that is, the upper wireless module DU_H), is provided through a method of using an offset value for changing the Beam ID. ... By changing the Beam ID using different offset values for each DU-L #N Beam-former), even if the same Beam ID based on the copy signal is provided, the beam direction can be changed at each antenna end (Remote equipment). To be there.

In particular, in the present invention, since the beam direction is different at each antenna end (remote device) by changing the Beam ID using an offset value for changing the Beam ID, the optimum offset value is determined at each antenna end (remote device). It will be important to use them differently.

To this end, the beamforming control apparatus 100 of the present invention includes an offset value setting unit 120.

In relation to the two or more wireless modules, the offset value setting unit 120 checks the quality of the wireless channel between the wireless module and the terminal by interworking with a terminal within the coverage of the wireless module in each of the wireless modules, and checks the checked wireless channel quality. Based on, it is responsible for setting an optimal offset value for use in changing the beam identifier.

In the following, as previously assumed, each sub-radio module (DU-L #1 Beam-former, ... DU-L #N Beam-former) distributed as two or more radio modules is referred to, and the first sub-radio module A description will be made on the assumption of the beamforming control apparatus 100 implemented in (DU-L #1 Beam-former).

According to this assumption, the offset value setting unit 120 interlocks with a terminal within the coverage of a lower wireless module (DU-L #1 Beam-former) in a lower wireless module (DU-L #1 Beam-former) to The radio channel quality between the module (DU-L #1 Beam-former) and the terminal can be checked, and an optimal offset value for use in changing the Beam ID may be set based on the checked radio channel quality.

Specifically, the offset value setting unit 120 sets an offset value in a lower wireless module (DU-L #1 Beam-former) and uses the set offset value to set the By repeating the process of checking the channel quality, a specific offset value at which the radio channel quality is equal to or greater than a predefined threshold quality may be set as the optimum offset value in the lower radio module (DU-L #1 Beam-former).

In remote equipment such as the antenna termination, that is, the sub-radio module (DU-L #1 Beam-former), the indicator (e.g. RSRP) indicating the quality (performance) of the radio channel with the terminal cannot be directly measured/confirmed. By estimating RSRP based on other indicators (eg RSSI) that can be checked directly from the remote device, the quality (performance) of the radio channel can be indirectly checked.

For example, the offset value setting unit 120 converts (estimates) the RSSI value to RSRP in the lower wireless module (DU-L #1 Beam-former) according to Equation 1 below, and thus the lower wireless module DU-L # 1 Beam-former) and radio channel quality between terminals can be checked.

In addition, the offset value setting unit 120 sets the offset value in the lower wireless module (DU-L #1 Beam-former) and the radio channel quality when forming the antenna beam according to the Beam ID changed by using the set offset value. By repeating the process of checking the RSRP value, a specific offset value in which the RSRP value is equal to or greater than a predefined threshold quality (RSRP_threshold) in the lower wireless module (DU-L #1 Beam-former) may be set as the optimal offset value.

According to a specific embodiment, the offset value setting unit 120 sets a default offset value in a lower wireless module (DU-L #1 Beam-former) and changes the Beam ID using the set offset value ( =Beam ID_Offset), check the radio channel quality during antenna beam formation, that is, the RSRP value, and if the checked RSRP value is not more than the threshold quality (RSRP_threshold), apply +1 to the previously set offset value to reset the offset value. .

In addition, the offset value setting unit 120 checks the radio channel quality at the time of forming the antenna beam according to the Beam ID (= Beam ID_Offset) changed using the reset offset value, that is, the RSRP value, and the checked RSRP value is the threshold quality. If it is not more than (RSRP_threshold), repeat the process of resetting the offset value by applying +1 to the previously set offset value.

Accordingly, the offset value setting unit 120 may set a specific offset value in which the RSRP value is equal to or greater than the threshold quality (RSRP_threshold) in the lower wireless module (DU-L #1 Beam-former) as the optimum offset value.

According to another embodiment, the offset value setting unit 120 sets a default offset value in a lower wireless module (DU-L #1 Beam-former), and a Beam ID (= Beam ID_Offset) of the radio channel quality during antenna beam formation, that is, the RSRP value, and if the checked RSRP value is not more than the threshold quality (RSRP_threshold), the offset value among the remaining offset values excluding the previously set offset value within the settable offset value range. The offset value is reset through a selection engine that selects (e.g., binary search, randomized serch, etc.).

In addition, the offset value setting unit 120 checks the radio channel quality at the time of forming the antenna beam according to the Beam ID (= Beam ID_Offset) changed using the reset offset value, that is, the RSRP value, and the checked RSRP value is the threshold quality. If it is not more than (RSRP_threshold), the process of resetting the offset value through the selection engine is repeated.

Accordingly, the offset value setting unit 120 may set a specific offset value in which the RSRP value is equal to or greater than the threshold quality (RSRP_threshold) in the lower wireless module (DU-L #1 Beam-former) as the optimum offset value.

According to another embodiment, the offset value setting unit 120 uses an offset value provided based on training through a Convolutional Neural Network (CNN) from a lower wireless module (DU-L #1 Beam-former). Check the radio channel quality at the time of forming the antenna beam according to the Beam ID (= Beam ID_Offset) changed using the set and set offset value, and if the checked RSRP value is not more than the threshold quality (RSRP_threshold), the weight in the CNN After the training is updated, it is reset to the offset value provided again from the CNN.

In addition, the offset value setting unit 120 checks the radio channel quality at the time of forming the antenna beam according to the Beam ID (= Beam ID_Offset) changed using the reset offset value, that is, the RSRP value, and the checked RSRP value is the threshold quality. If it is not more than (RSRP_threshold), the process of resetting to the offset value provided again from the CNN after weight training is updated in the CNN is repeated.

Accordingly, the offset value setting unit 120 may set a specific offset value in which the RSRP value is equal to or greater than the threshold quality (RSRP_threshold) in the lower wireless module (DU-L #1 Beam-former) as the optimum offset value.

Hereinafter, it is assumed that 60 is set as the optimal offset value in the lower wireless module (DU-L #1 Beam-former).

In this case, the beam identifier changing unit 110, in the Beam ID (for example, Beam ID 1) provided to the lower wireless module (DU-L #1 Beam-former), the lower wireless module (DU-L #1 Beam- Former), it is possible to change the Beam ID (= Beam ID_Offset: 61) by adding the optimally set offset value (Offset 60) as described above.

The beam forming unit 130 is responsible for forming an antenna beam beamformed in a beam direction according to a beam identifier changed in each of the radio modules, that is, a Beam ID.

In the following, as previously assumed, each sub-radio module (DU-L #1 Beam-former, ... DU-L #N Beam-former) distributed as two or more radio modules is referred to, and the first sub-radio module A description will be made on the assumption of the beamforming control apparatus 100 implemented in (DU-L #1 Beam-former).

According to this assumption, the beam forming unit 130 is not a Beam ID (eg, Beam ID 1) provided to a lower wireless module (DU-L #1 Beam-former) from the upper, that is, the upper wireless module (DU-H). , An antenna beam beamformed in the beam direction according to the changed Beam ID (= Beam ID_Offset: 61) in the lower wireless module (DU-L #1 Beam-former) may be formed.

In this way, the beamforming control device 100 implemented in each antenna termination (Remote equipment), that is, a distributed sub-radio module (DU-L #1 Beam-former, ... DU-L #N Beam-former). ) Is an offset value that is optimally set for the Beam ID (e.g., Beam ID 1) provided to each sub-radio module (DU-L #1 Beam-former,... DU-L #N Beam-former) By changing to different Beam IDs (= Beam ID_Offset) by using, the beam direction can be changed at each antenna end (remote device) even if the same Beam ID based on the copy signal is provided.

3 shows a circuit configuration of a wireless module in which a beamforming control apparatus according to an embodiment of the present invention is implemented, that is, a lower wireless module (DU-L) as an antenna termination (remote equipment).

In FIG. 3, an active antenna unit (AAU) is shown as an antenna terminal (remote equipment).

As shown in Fig. 3, in the AAU equipment as an antenna termination (remote equipment), when a copy signal (base station signal) copied from the upper, for example, the upper wireless module (DU-H) is received, a signal processing path (e.g., SFP Module) and I/F, CPRI Mapper, ADC, Transceiver IC, RF Beamformer) radiates the processed signal as a wireless type signal, and thus a copy signal (base station signal) copied from the upper wireless module (DU-H) Each antenna terminal (Remote equipment) that is received equally emits the same base station signal.

In FIG. 3, the beamforming control apparatus of the present invention implemented in the AAU equipment is shown as a Proposed BeamForming Controller.

That is, the beam identifier changing unit 110 described in the above-described beamforming control apparatus 100 corresponds to the Beam ID offset summation in the circuit configuration in the AAU equipment shown in FIG. 3, and the offset value setting unit 120 It corresponds to the ID offset, it will be said that the beam forming unit 130 corresponds to the BeamBook and the RF Beamformer.

Of course, the equipment implementing the lower wireless module (DU-L) as an antenna termination (remote equipment) may be various equipment such as DAS in addition to AAU, and accordingly, the beam identifier change unit 110 of the beamforming control device 100 of the present invention. ), the offset value setting unit 120, and the beam forming unit 130 may be implemented as circuit units of different positions and shapes.

Accordingly, with reference to FIG. 4, an example of forming antenna beams in different beam directions at each antenna terminal (remote device) according to the present invention, even if the same Beam ID is provided will be described as follows.

For convenience of explanation, similarly to FIG. 1, a description will be made on the basis of an in-building solution used as an end of each antenna in which remote equipment corresponding to the lower wireless module DU_L is distributed.

As with the description with reference to FIG. 1, in FIG. 4, the copy signal copied to each antenna end, that is, each sub-radio module (DU-L #1 Beam-former, ... DU-L #N Beam-former) is at the top. That is, it is transmitted from the upper wireless module (DU_H).

At this time, in the beamforming control apparatus 100 of the present invention implemented in each of the lower wireless modules (DU-L #1 Beam-former,... DU-L #N Beam-former), , Beam ID (e.g., Beam ID 1) provided to the lower wireless module (DU-L) implemented by itself, using the offset value set through the process of setting the optimal offset value based on the quality of the radio channel with the terminal Change (=Beam ID_Offset).

Accordingly, in each of the lower wireless modules (DU-L #1 Beam-former,... DU-L #N Beam-former), the same Beam ID (eg, Beam ID 1) was provided from the upper wireless module (DU_H). , By changing each different Beam ID (= Beam ID_Offset) using the optimally set offset value, the radio with the terminal according to the Beam ID (= Beam ID_Offset) changed differently based on the radio channel quality with the terminal. It is possible to form an antenna beam beamformed in different beam directions in which the channel quality is optimal.

In this way, in each distributed antenna termination, that is, each sub-radio module (DU-L #1 Beam-former,... DU-L #N Beam-former), the radio channel quality with the terminal is optimal in different directions. When the antenna beam direction is optimized, the channel between the distributed antenna termination ((DU-L #1 Beam-former,... DU-L #N Beam-former) and the terminal can be optimized, and eventually, an in-building solution. The system performance will be improved.

Meanwhile, in the present invention, the process of setting the optimal offset value based on the quality of the radio channel with the terminal may be periodically repeated, and in this case, the transmission performance of the terminal may be lowered during the process of setting the optimum offset value. It is necessary to optimize the transmission performance deterioration of the terminal.

To this end, in the beamforming control apparatus 100 of the present invention, a function of optimizing (adjusting) a period for setting an optimum offset value (hereinafter, an offset setting period) can be further realized.

Specifically, the offset value setting unit 120, depending on whether the terminal in the coverage of the wireless module, that is, the lower wireless module (DU-L #1 Beam-former) implemented with the beamforming control device 100 moves or stays. , In the lower wireless module (DU-L #1 Beam-former), a setting period for setting an optimal offset value, that is, an Offset setting period may be adjusted.

At this time, the offset value setting unit 120 is based on the amount of change between the optimal offset values previously set in the wireless module, that is, the lower wireless module (DU-L #1 Beam-former) in which the beamforming control device 100 is implemented. , It may be determined whether the UE in the coverage of the lower wireless module (DU-L #1 Beam-former) moves or resides.

For example, the offset value setting unit 120 calculates the amount of change between the optimal offset values set for each of the most recent two or more offset setting periods, and determines that the terminal moves if the amount of change between the calculated optimal offset values is greater than or equal to the threshold change amount. And, if the amount of change between the calculated optimal offset values is not more than the threshold change amount, it may be determined that the terminal is settled.

In addition, the offset value setting unit 120 may determine whether the terminal is moving or settled based on the identification of the location of the terminal for a certain period of time and the amount of change through interworking with an external location-based service.

Accordingly, the offset value setting unit 20 may shorten the offset setting period if the terminal moves, and may adjust the offset setting period long if the terminal resides.

In this way, the method of adjusting the offset setting period short or long can be realized by changing the previous offset setting period as short or long as the setting value, or by reflecting additional parameters such as the number of terminals and the amount of traffic. It can also be realized in a way that changes as short or long as the determined decision value.

In this case, in the present invention, in periodically repeating the process of setting the optimal offset value based on the quality of the radio channel with the terminal, the period for setting the optimum offset value, that is, the period for setting the offset value is optimized, and the terminal caused during the process of setting the optimum offset value. It is possible to minimize the degradation of transmission performance.

As described above, according to the beamforming control apparatus of the present invention, when operating a distributed antenna termination (remote device) for an in-building solution, even if the same Beam ID is provided to each remote device, the beam direction is optimized by each remote device, Channels with remote equipment and terminals can be optimized.

For this reason, in the present invention, when operating a distributed antenna terminal (remote equipment) for an in-building solution, it is possible to derive an effect of improving the system performance of the in-building solution.

Hereinafter, a beamforming control method according to an embodiment of the present invention will be described with reference to FIG. 5.

The beamforming control method of the present invention may be implemented at each antenna end (eg, a remote device), or may be a separate device interlocking with each antenna end and its upper end tube.

Hereinafter, for convenience of explanation, it is assumed that the beamforming control method of the present invention is implemented in each antenna terminal (eg, remote device), and each lower wireless module corresponding to the antenna terminal shown in FIG. 4 ( DU-L #1 Beam-former,... DU-L #N Beam-former) of the first sub-radio module (DU-L #1 Beam-former) implemented on the assumption that the beamforming control device 100 is described. would.

According to the beamforming control method of the present invention, when the beamforming control device 100, for example, the beamforming control device 100 implemented in the lower wireless module (DU-L #1 Beam-former), reaches the offset setting period. (S10 Yes), the sub-radio module (DU-L #1 Beam-former) in which it is implemented performs a process of setting an optimal offset value based on the radio channel quality with the terminal (S12 to S18).

Specifically, the beamforming control device 100 sets an offset value in a lower wireless module (DU-L #1 Beam-former) in which it is implemented (S12), and according to the changed Beam ID using the set offset value. By repeating the process of checking the radio channel quality during antenna beam formation (S14), a specific offset value in which the radio channel quality exceeds a predefined threshold quality in the lower radio module (DU-L #1 Beam-former) is optimized. It can be set as an offset value (S16 Yes, S18).

Hereinafter, it is assumed that 60 is set as the optimal offset value in the lower wireless module (DU-L #1 Beam-former).

According to the beamforming control method of the present invention, the beamforming control device 100, for example, the beamforming control device 100 implemented in a lower wireless module (DU-L #1 Beam-former), includes an upper wireless module (DU-H). ) From the lower wireless module (DU-L #1 Beam-former) to the copy signal-based Beam ID (e.g., Beam ID 1) (S20), in the lower wireless module (DU-L #1 Beam-former) Beam ID (= Beam ID_Offset: 61) may be changed by adding an optimally set offset value (Offset 60) as described above (S30).

Accordingly, according to the beamforming control method of the present invention, the beamforming control apparatus 100 includes a Beam ID provided from the upper, that is, the upper radio module DU-H, to the lower radio module DU-L #1 Beam-former. Example: It is possible to form an antenna beam beamformed in the beam direction according to the Beam ID (= Beam ID_Offset: 61) changed in the lower wireless module (DU-L #1 Beam-former) other than Beam ID 1) (S40 ).

In this way, the beamforming control device 100 implemented in each antenna termination (Remote equipment), that is, a distributed sub-radio module (DU-L #1 Beam-former, ... DU-L #N Beam-former). ) Is an offset value that is optimally set for the Beam ID (e.g., Beam ID 1) provided to each sub-radio module (DU-L #1 Beam-former,... DU-L #N Beam-former) By changing to different Beam IDs (= Beam ID_Offset) by using, the beam direction can be changed at each antenna end (remote device) even if the same Beam ID based on the copy signal is provided.

Meanwhile, according to the beamforming control method of the present invention, the beamforming control device 100, for example, the beamforming control device 100 implemented in a lower wireless module (DU-L #1 Beam-former), includes a lower wireless module (DU). -L #1 Beam-former), depending on whether the terminal moves or stays in the coverage, the lower wireless module (DU-L #1 Beam-former) can adjust the setting period for setting the optimal offset value, that is, the Offset setting period. Yes (S50).

For example, the beamforming control device 100 may determine the amount of change between the optimal offset values previously set in the wireless module, that is, the lower wireless module (DU-L #1 Beam-former) in which the beamforming control device 100 is implemented. Based on the basis, it may be determined whether the UE in the coverage of the lower wireless module (DU-L #1 Beam-former) moves or resides.

Accordingly, the beamforming control apparatus 100 may shorten the offset setting period when the terminal moves, and may adjust the offset setting period long when the terminal resides.

In the beamforming control method of the present invention as described above, unless the operation of the beamforming control apparatus 100 is turned off or the implemented sub-radio module (DU-L #1 Beam-former) is turned off (S60 No), We will perform the above operations repeatedly.

As described above, according to the present invention, when operating a distributed antenna termination (remote device) for an in-building solution, even if the same Beam ID is provided to each remote device, each remote device optimizes the beam direction, Channel can be optimized.

For this reason, in the present invention, when operating a distributed antenna terminal (remote equipment) for an in-building solution, it is possible to derive an effect of improving the system performance of the in-building solution.

The beamforming control method according to an embodiment of the present invention may be implemented in the form of a program command that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like alone or in combination. The program instructions recorded on the medium may be specially designed and configured for the present invention, or may be known and usable to those skilled in computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tapes, optical media such as CD-ROMs and DVDs, and magnetic media such as floptical disks. -A hardware device specially configured to store and execute program instructions such as magneto-optical media, and ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine language codes such as those produced by a compiler, but also high-level language codes that can be executed by a computer using an interpreter or the like. The hardware device described above may be configured to operate as one or more software modules to perform the operation of the present invention, and vice versa.

Until now, the present invention has been described in detail with reference to preferred embodiments, but the present invention is not limited to the above-described embodiments, and the technical field to which the present invention belongs without departing from the gist of the present invention claimed in the following claims. Anyone of ordinary skill in the art will say that the technical idea of the present invention extends to the range in which various modifications or modifications are possible.

According to the beamforming control apparatus and beamforming control method of the present invention, when operating a distributed antenna termination (remote equipment) for an in-building solution, even if the same Beam ID is provided to each remote equipment, each remote equipment can optimize the beam direction. From the point of view, as it goes beyond the limitations of the existing technology, the possibility of commercialization or sales of the applied device is sufficient as well as the degree to be practically obvious, so that the invention has industrial applicability. to be.

100: beam forming control device
110: beam identifier change unit 120: offset value setting unit
130: beam forming unit

Claims (13)

In relation to two or more radio modules receiving the same beam identifier indicating the beam direction, the beam identifier change to change the received beam identifier from each of the radio modules to be different from the beam identifiers of other radio modules in the two or more radio modules. part; And
And a beam forming unit configured to form an antenna beam beamformed in a beam direction according to a beam identifier changed in each of the radio modules. The method of claim 1,
The beam identifier changing unit,
The beamforming control apparatus, characterized in that for changing the beam identifier provided to the wireless module by using an offset value preset in the wireless module. The method of claim 1,
In relation to the two or more wireless modules, each of the wireless modules interlocks with a terminal within the coverage of the wireless module to check the quality of a wireless channel between the wireless module and the terminal,
And an offset value setting unit configured to set an optimum offset value for use in changing the beam identifier based on the checked radio channel quality. The method of claim 3,
The offset value setting unit,
By repeating the process of setting the offset value in the wireless module and checking the radio channel quality when forming the antenna beam according to the changed beam identifier using the set offset value,
And setting a specific offset value in which the radio channel quality is equal to or greater than a predetermined threshold quality in the radio module as an optimum offset value. The method of claim 3,
The offset value setting unit,
A beamforming control apparatus, characterized in that, according to whether a terminal within the coverage of the wireless module moves or resides, a setting period for setting an optimum offset value in the wireless module is adjusted. The method of claim 5,
The offset value setting unit,
A beamforming control apparatus, characterized in that it determines whether a terminal within the coverage of the wireless module moves or stays based on an amount of change between the optimal offset values previously set in the wireless module. The method of claim 1,
The two or more wireless modules,
A beamforming control device, characterized in that it is a remote device installed in an in-building and receiving a copy signal including a beam identifier from an upper end of the wireless module. In the beamforming control method operating in a wireless module,
A beam identifier changing step of changing a beam identifier indicating a beam direction provided from the top to be different from the beam identifiers of other radio modules in two or more radio modules receiving the same beam identifier; And
And a beam forming step of forming an antenna beam beamformed in a beam direction according to the changed beam identifier. The method of claim 8,
The step of changing the beam identifier,
The beamforming control method comprising changing the beam identifier provided to the wireless module by using a preset offset value. The method of claim 8,
Check the wireless channel quality between the wireless module and the terminal by interworking with the terminal within the coverage of the wireless module,
And an offset value setting step of setting an optimum offset value for use in changing the beam identifier based on the checked radio channel quality. The method of claim 10,
The offset value setting step,
By repeating the process of checking the radio channel quality when forming the antenna beam according to the beam identifier changed using the offset value setting and the set offset value,
And setting a specific offset value in which the radio channel quality is equal to or greater than a predetermined threshold quality as an optimum offset value in the radio module. The method of claim 10,
Further comprising a determining step of determining whether the terminal within the coverage of the wireless module moves or resides;
The offset value setting step,
The beamforming control method, characterized in that the setting period for setting the optimum offset value in the wireless module is adjusted according to a determination result of the determination step. A computer program stored on a medium for executing the method of claim 8.

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