KR20200012643A - Subarray configuration system and method in massive MIMO - Google Patents

Abstract

The present invention provides a subarray configuration system in massive multiple input multiple output (MIMO) and a method thereof which can secure coverage. The method, in which a subarray configuration system configures an uplink subarray consisting of a plurality of antenna elements in massive MIMO, maps a first and a second subarray consisting of a plurality of antenna elements and a first and a second transceiver installed in a base station to transceive signals with a plurality of terminals. If uplink reception signal strength received by the first and the second transceiver is higher than or equal to a threshold, merging of the first and the second subarray is determined to allow an uplink signal transferred to a first low-noise amplifier of the first transceiver to enter a second low-noise amplifier of the second transceiver. The second transceiver is mapped to the first and the second subarray to allow the second transceiver of the second subarray to receive an uplink signal received via the first subarray and an uplink signal received via the second subarray.

Description

Subarray configuration system and method in massive MIMO

The present invention relates to a system and method for subarray setting in large scale MIMO.

Massive Massive Multiple Input Multiple Output (MIMO) uses multiple antenna elements to generate beams. Depending on the beam generation method, a combination of the two methods, analog beamforming that generates a beam using a phase shifter and digital beamforming that obtains a weight vector from a digital stage, generates the beam Hybrid beamforming used in this way is largely divided into three.

Currently, digital beamforming is implemented in the form of a subarray (subarray) in which some antenna arrays are bundled after the transceiver due to cost and complexity constraints. The sub array is composed of two to four antenna elements, and the downlink / uplink paths are the same. In the case of configuring digital beamforming as described above, the downlink performs beamforming by giving a weight vector at the digital stage, but the uplink undergoes OFDM demodulation of the signal received by the transceiver through the antenna and then performs beamforming effect through the weight vector. You get

However, the signal of the far-end terminal at the coverage boundary is not secured to the signal-to-interface noise ratio (SINR) that enters the transceiver input, and thus does not give a beamforming effect even if a weight vector is given. Therefore, a beamforming gain may be obtained in proportion to the number of antenna elements for a strong electric field or a medium electric field terminal, but a beamforming gain may not be obtained in proportion to the number of antenna elements for a terminal located at a weak point or a coverage boundary. (coverage hole) will occur.

Accordingly, the present invention provides a system and method for subarray setting in large scale MIMO that can secure coverage through adaptive application of an asymmetric subarray arrangement in large scale MIMO.

As a method for setting a subarray composed of a plurality of antenna elements in a subarray setting system in a multiple input multiple output (MIMO), which is one feature of the present invention for achieving the technical problem of the present invention,

In order to transmit and receive signals with a plurality of terminals, mapping the first and second transceivers, each of which comprises a plurality of antenna elements, to a first transceiver and a second transceiver installed in a base station, the first transceiver And if the uplink received signal strength received by the second transceiver is greater than or equal to a threshold, the uplink signal transmitted to the first low noise amplifier of the first transceiver is introduced into the second low noise amplifier of the second transceiver. Determining a merge of a subarray and a second subarray; and an uplink signal received through the first subarray and an uplink signal received through the second subarray, the second transceiver of the second subarray. And mapping the second transceiver to the first subarray and the second subarray for reception.

The determining of the merging of the first subarray and the second subarray may include comparing the number of first antenna elements of a subarray receiving a downlink signal with the number of second antenna elements of a subarray transmitting an uplink signal. In an exemplary embodiment, if the number of first antenna elements and the number of second antenna elements are different and the uplink received signal strength is greater than a first threshold value among the thresholds, the first and second subarrays are determined to be merged. And switching the uplink signal flowing into the first low noise amplifier of the first transceiver to which the first subarray is connected is introduced into the second low noise amplifier of the second transceiver to which the second subarray is connected. have.

If the uplink received signal strength is less than the first threshold, checking whether the uplink received signal strength is greater than a second one of the thresholds; and the uplink received signal strength is greater than the second threshold. If so, determining that the first sub-array and the second sub-array are merged, and the uplink signal flowing into the first low noise amplifier of the first transceiver to which the first sub-array is connected is connected to the second sub-array. And switching to enter the second low noise amplifier of the second transceiver.

The determining of the merging of the first subarray and the second subarray may include: if the number of the first antenna elements and the number of the second antenna elements are the same and the uplink received signal strength is greater than the second threshold, the first subarray; And maintaining the subarray and the second subarray.

If the uplink received signal strength is less than the second threshold, checking whether the output of the terminal transmitting the signal to the base station is maximum; if the output of the terminal is maximum, the first subarray and the second subarray Determining to merge and switching the uplink signal flowing into the first low noise amplifier flows into the second low noise amplifier.

A system for setting a sub-array composed of a plurality of antenna elements in MIMO (Multiple Input Multiple Output) which is another feature of the present invention for achieving the technical problem of the present invention,

An information acquisition module for collecting the uplink received signal strength received by each of the plurality of transceivers installed in the base station, and a first transceiver and a second transceiver, each of which comprises a first subarray and a second subarray. When the uplink received signal strength is greater than or equal to a threshold, the uplink signals transmitted to the first subarray and the second subarray are introduced into the low noise amplifier of the second transceiver. And a subarray set determination module for merging the two subarrays.

The subarray set determination module compares the number of first antenna elements of a subarray receiving a downlink signal with the number of second antenna elements of a subarray transmitting an uplink signal, and the number of the first antenna elements and the second antenna element. When the number of antenna elements is different and the uplink received signal strength is larger than a first threshold value among the thresholds, it may be determined to merge the first subarray and the second subarray.

The subarray set determination module determines that the first subarray and the second subarray are merged when the uplink received signal strength is less than the first threshold but greater than the second threshold. The first threshold may be calculated by adding a gain obtained by merging the first subarray and the second subarray.

The subarray set determination module merges the first subarray and the second subarray when the number of the first antenna elements and the number of the second antenna elements are the same and the output of the terminal transmitting the uplink signal is maximum. You can decide.

Another aspect of the present invention for achieving the technical problem of the present invention is a base station,

An antenna including a plurality of antenna elements, a plurality of antenna elements mapped to each of a plurality of subarrays each configured of at least two antenna elements of the plurality of antenna elements to amplify an uplink reception signal and a downlink reception signal A transceiver, a subarray set determining module for determining merging of at least two or more subarrays of the subarrays if the uplink received signal strengths respectively received by the plurality of transceivers are greater than a threshold; and the plurality of subarrays If a merge of the first subarray and the second subarray is determined, a first low noise amplifier of the first transceiver to which the first subarray is mapped is mapped to the second subarray, so that a second of the second subarray is mapped. Receive uplink signals transmitted to the first and second subarrays through a low noise amplifier. And a switch for switching the lock.

It may include an information collection module for collecting at least one information of the uplink received signal strength, terminal power information, path loss information received by each of the plurality of transceivers.

The plurality of transceivers include a low noise amplifier amplifying the uplink received signal and a first power amplifier and a second power amplifier amplifying a downlink received signal, respectively, wherein the first power amplifier is mapped to a first subarray. And the second power amplifier is mapped to a second subarray, and the low noise amplifier is mapped to a first subarray and a second subarray.

According to the present invention, a large scale MIMO system using digital beamforming may have a beamforming gain in proportion to the number of antenna elements regardless of the position of the terminal.

1 is an exemplary diagram of an antenna system in a large scale MIMO using general digital beamforming.
2 is a structural diagram of a subarray setting system in a large scale MIMO according to an embodiment of the present invention.
3 is a flowchart illustrating a subarray setting method according to an embodiment of the present invention.
4A and 4B are exemplary views of an antenna system according to a first embodiment of the present invention.
5 is an exemplary view of an antenna system according to a second embodiment of the present invention.
FIG. 6 is an exemplary diagram comparing coverage by subarray structure and coverage by subarray structure according to an embodiment of the present invention in general digital beamforming according to the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, except to exclude other components unless specifically stated otherwise.

Hereinafter, a system and method for setting a subarray in large scale MIMO will be described with reference to the accompanying drawings. Before describing an embodiment of the present invention, an antenna system using general digital beamforming will be described with reference to FIG. 1.

1 is an exemplary diagram of an antenna system in a large scale MIMO using general digital beamforming.

As shown in FIG. 1, in general digital beamforming, the transceiver 20 is not included in a structure in which all the antenna elements 10 are interlocked with the transceiver 20. Is interlocked.

The signal transmitted by any terminal is received by a plurality of transceivers 20, and the gains are obtained by combining the signals received by the various transceivers 20, respectively. In this case, since the output of the terminal is large in the case of the terminal in the short distance from the base station, it is possible to secure the SINR, thereby obtaining a beamforming effect. However, in the case of a signal raised by the terminal at the coverage end of the base station, the SINR coming into the transceiver 20 is not secured, and thus the beam gain by the antenna element is not maximized.

Therefore, the embodiment of the present invention will be described with reference to FIG. 2 with reference to the sub-array setting system 100 to have a beamforming gain in proportion to the number of antenna elements regardless of the position of the terminal. In the embodiment of the present invention, when the subarray set is the same as the downlink, the description is divided into a case where the subarray sets are different from each other according to the size of the uplink SINR for each path.

2 is a structural diagram of a subarray setting system in a large scale MIMO according to an embodiment of the present invention.

As shown in FIG. 2, the subarray setting system 100 operating with at least one processor includes a terminal information receiving module 110 and a subarray set determination module 120.

The terminal information receiving module 110 collects all the terminal information in the coverage formed by the base station where the subarray setting system 100 is installed. In this case, the terminal information includes information such as reception SINR, uplink SINR, terminal power information, and path loss for each transceiver. Since the terminal information receiving module 110 collects terminal information in various ways, embodiments of the present invention are not limited to any one method.

The subarray set determination module 120 bundles any number of antenna elements when the first base station is driven to form a plurality of subarray sets. In this case, the number of antenna elements used to process the uplink signal and the number of antenna elements used to process the downlink signal among the subarrays may be the same or different.

The subarray set determination module 120 may use the plurality of subarrays as they are or change the number of antenna elements included in the plurality of subarrays based on the terminal information collected by the terminal information receiving module 110. That is, the UE information receiving module 110 compares the received SINR for each transceiver received with a preset threshold, and maintains the sub-arrays for processing the currently uplink signal and transmits the uplink signal. Alternatively, it is determined whether to merge at least two neighboring subarrays so as to operate as a subarray processing one uplink signal.

When the subarray set determination module 120 determines to bundle at least two neighboring subarrays to operate as one subarray, the subarray set determination module 120 transmits a control signal to the switch so that uplink subarrays having an increased number of antenna elements are mapped to the transceiver. Here, the subarray set determination module 120 determines whether the number of antenna elements currently used in the subarrays to process the uplink signal and the number of antenna elements used in the subarrays to process the downlink signal are the same. Can be. This will be described later in detail.

In the embodiment of the present invention, for convenience of description, only the terminal information receiving module 110 and the subarray set determination module 120 are included in the subarray setting system 100 of the base station. Other components may be included. In addition, in the embodiment of the present invention, both the terminal information receiving module 110 and the subarray set determination module 120 are located in a RU (Radio Unit), which will be described as an example. The terminal information receiving module 110 may be located in a digital unit (DU) and the subarray set determination module 120 may be located in an RU.

A method for setting a subarray using the subarray setting system 100 described above will be described with reference to FIG. 3.

3 is a flowchart illustrating a coverage setting method according to an embodiment of the present invention.

As shown in FIG. 3, the subarray setting system 100 bundles the antenna elements by a predetermined number to configure a plurality of subarray sets including a plurality of antenna elements (S100). Here, each of the plurality of subarrays includes a plurality of antenna elements, and all of the plurality of subarrays process an uplink signal and a downlink signal. In this case, the number of antenna elements included in each subarray, the number of antenna elements used to process an uplink signal, and the number of antenna elements used to process a downlink signal are not limited to any one number.

In this case, the base station is divided into a subunit set, a plurality of transceivers, switches, a radio unit (RU) including a plurality of band pass filters (BPFs), and a digital unit (DU) for beamforming. Here, the subarray setting system 100 may include all components in the RU, some may be included in the RU, some may be included in the DU.

The base station transmits an uplink signal to the terminal using a plurality of subarray sets, and starts receiving a downlink signal from the terminal using the subarray sets. Then, the subarray setting system 100 collects terminal information including received SINR, uplink SINR, terminal output information, path loss, etc. for the uplink signal received by each transceiver (S101).

When the subarray setting system 100 collects the terminal information, the number of antenna elements used to process the downlink signal among the subarray sets based on the information on the current subarray sets (hereinafter, 'the first subarray'). The number of antenna elements (hereinafter, also referred to as a 'second sub-array set') used for processing the uplink signal is set to be the same (S102).

If the first subarray set and the second subarray set identified in step S101 are set to be the same, the uplink signal reception strength (hereinafter, referred to as uplink SINR) for each of the plurality of transceivers received in step S101 is the first. Check whether it is larger than the threshold (S103). A response signal to an uplink signal transmitted from an arbitrary terminal is equally introduced into a plurality of transceivers, and a plurality of transceivers combine to receive a received signal, respectively, to gain.

Therefore, if the uplink SINR value received by each of the plurality of transceivers is smaller than the first threshold value, the subarray setting system 100 checks whether the terminal output is the maximum based on the terminal output information included in the terminal information. S104). Here, the method for confirming whether the subarray setting system 100 is the maximum terminal output can be executed in various ways, and therefore, the embodiment of the present invention is not limited to any one method.

If the terminal output is not maximum, the control signal is generated and transmitted to the terminal to increase the terminal output (S108), and then the procedure after step S101 is performed. However, if the terminal output is maximum, the optimal subarray set is calculated (S105). That is, the number of antenna elements to be included in the subarray set is calculated. In addition, by controlling the operation of the low-noise amplifier of the transceiver connected to each adjacent uplink subarray set by the number of antenna elements, the plurality of subarray sets are merged into one subarray set to process the uplink signal.

The subarray set for uplink signal processing is changed to the calculated optimal subarray set (S106). Here, since the subarray setting system 100 calculates the optimal subarray set in various ways, the embodiment of the present invention is not limited to any one method.

On the other hand, as a result of checking in step S103, if the received SINR for each of the plurality of transceivers is greater than the first threshold value, the subarray setting system 100 maintains the current uplink subarray set. That is, the number of antenna elements included in the uplink subarray sets is not changed.

As a result of checking in step S101, when the current first subarray set is different from the second subarray set, the subarray setting system 100 checks whether the received SINR value for each of the plurality of transceivers is greater than a second threshold value. (S109). Here, the second threshold value corresponds to a value obtained by adding a gain according to a change of a subarray set to the first threshold value in step S103.

If the received SINR value for each of the plurality of transceivers is greater than the second threshold value, the optimal subarray set is calculated and changed according to step S105. However, if the received SINR value of the uplink for each of the transceivers is less than the second threshold, it is checked whether the first SI is greater than the first threshold (S110). If it is larger than the first threshold value, the subarray set is maintained (S111). If it is smaller than the first threshold value, the optimal subarray set is calculated and changed according to step S105.

An example of an antenna system in which a subarray set is calculated through the above procedure will be described with reference to FIGS. 4A and 4E and 5.

4A and 4B are exemplary views of an antenna system according to a first embodiment of the present invention, and FIG. 5 is an exemplary view of an antenna system according to a second embodiment of the present invention.

First, as shown in FIGS. 4A and 4B illustrating a case in which the number of antenna elements included in the uplink subarray set can be varied. Before describing FIGS. 4A and 4B, only four transceivers 210 to 240 are illustrated in the embodiment of the present invention, but the present invention is not necessarily limited thereto. In addition, it is assumed that all of the transceivers 210 to 240 are mapped to the subarray sets 310 and 320 each of four antenna elements for transmitting an uplink signal.

As shown in FIG. 4A, a transceiver 210 to 240 including a power amplifier (PA) that amplifies the power of a downlink signal and a low noise amplifier (LNA) that amplifies an uplink received signal. These are mapped to the subarray sets 310 and 320 in which a plurality of antenna elements are grouped, respectively.

In this case, the low noise amplifier 210-2 of the first transceiver 210 and the low noise amplifier 220-2 of the second transceiver 220 are connected to the first switch 410. One side of the first switch 410 is connected to the subarray set determination module 120. Similarly, the low noise amplifier 240-3 of the third transceiver 230 and the low noise amplifier 240-2 of the fourth transceiver 240 are connected to the second switch 420, and the second switch 420. One side of is connected to the subarray set determination module 120.

In the first embodiment of the present invention, two transceivers are connected to one switch. In response to the switching of the switches 410 and 420 according to the subarray set determined by the subarray set determination module 120, the low noise amplifiers included in the respective transceivers operate, or low noise of one of the low noise amplifiers in the two transceivers. The amplifier does not work and allows only one low noise amplifier to operate. In the first embodiment of the present invention, the switches 410 and 420 are connected to two low noise amplifiers as an example, but the present invention is not necessarily limited thereto.

The power amplifiers 210-1 and 230-1 of the first transceiver 210 and the third transceiver 230 are respectively connected to a band pass filter (BPF) 510 and 530 to provide a plurality of antenna elements. It is connected to a set of subarrays. The low noise amplifiers 220-2 and 240-2 of the second transceiver 220 and the fourth transceiver 240 are connected to the band pass filters 520 and 540 through the switches 410 and 420, respectively. Is connected to the set.

Through such a configuration, each of the transceivers 210 to 240 is connected to a subarray set to provide a service to a terminal in a region where a gain can be obtained even with a conventional digital beamforming scheme.

However, for a terminal at the end of coverage where a coverage gap may occur in the conventional scheme, the switch is controlled to use two transceivers together with one transceiver. This will be described with reference to FIG. 4B.

As shown in FIG. 4B, and by the control of the switches 410 and 420, the low noise amplifier 210-2 of the first transceiver 210 is controlled to not operate. The low noise amplifier 220-2 of the second transceiver 220 is connected to the subarray set through the first switch 410, so that the first subarray set 310 and the second subarray set 320 are connected. Process all uplink signals.

That is, in FIG. 4A, the low noise amplifiers 210-2 and 220-2 of the first transceiver 210 and the second transceiver 220 are connected to the subarray sets 310 and 320, respectively. The low noise amplifier 220-2 of the 220 stops the operation of the low noise amplifier 210-2 of the first transceiver 210 so that both are connected to the subarray sets 310 and 320. Through this, the low noise amplifier 220-2 of the second transceiver 220 ensures network quality and coverage by using the increased subarray.

In FIGS. 4A and 4B, the first switch 410 and the second switch 420 may include the low noise amplifiers 220-2 and 240-of the second transceiver 220 and the fourth transceiver 240. 2) is shown as an example. However, the first switch 410 and the second switch 420 may be connected to all of the low noise amplifiers 210-2 to 240-2, or are connected to the front ends of the low noise amplifiers 210-2 to 240-2. There may be.

Meanwhile, as shown in FIG. 5 illustrating a case in which the number of antenna elements included in the uplink subarray set is fixed, the first transceiver 610 and the second transceiver 620 each have two power amplifiers 610. The configuration of -1, 610-3, 620-1, and 620-3 and one low noise amplifier 610-2 and 620-2 will be described as an example, but is not necessarily limited thereto. In the second embodiment of the present invention, a case in which the number of antenna elements included in the uplink subarray set is fixed to eight is not necessarily limited thereto.

The first power amplifier 610-1 and the second power amplifier 610-3 of the first transceiver 610 are implemented to be connected to a subarray set of four antenna elements, respectively. The first power amplifier 620-1 and the second power amplifier 620-3 of the second transceiver 620 are also implemented to be connected to a subarray set of four antenna elements, respectively.

On the other hand, the low noise amplifier 610-2 of the first transceiver 610 is connected to two BPFs 510 and 520 and is connected to eight antenna elements, respectively. The low noise amplifier 620-2 of the second transceiver 620 is also connected to two BPFs 530 and 540 and is connected to eight antenna elements, respectively.

Through such a configuration, the subarray processing the downlink signal is processed by four antenna elements, and the subarray processing the uplink signal is processed by eight antenna elements. Thus, it has a beam gain with all antenna elements, so that coverage can be generated normally.

 An example of applying the uplink subarray described above and an example of determining a subarray set will be described with reference to FIG. 6.

FIG. 6 is an exemplary diagram comparing coverage by subarray structure and coverage by subarray structure according to an embodiment of the present invention in general digital beamforming according to the present invention.

6 (a) is an exemplary diagram illustrating a received SINR when uplink and downlink have the same beamforming gain. FIG. 6 (b) shows the coverage according to the subarray structure in general digital beamforming, and FIG. 6 (c) shows the coverage according to the subarray structure according to the embodiment of the present invention.

Before comparing the coverage for each subarray structure, it is assumed that the uplink beamforming gain and the downlink beamforming gain are the same, and antenna gain can be obtained only by beamforming.

As shown in FIG. 6A, it is assumed that the terminal transmits a signal with an output of 23 dBm and has a path loss of 169 dB at the boundary of coverage formed by the base station. The signal transmitted from the terminal is introduced into the antenna array with an output of 146dBm. And this signal is introduced into the RU (Radio Unit) 121dBm through the antenna gain 25dBi, in this case it is assumed that the received SINR confirmed by the RU is -5dB.

Then, as shown in (b) of FIG. 6, in general digital beamforming, a beamforming weight vector calculation is obtained from a digital unit (DU), and the antenna array is configured only by a subarray for each transceiver, so that beamforming gain and combined gain It can be said that the sum has a beamforming gain.

In the embodiment of the present invention, it is assumed that the subarrays are 2 1 (C1), 4 1 (C2), and 8 1 (C3), and a SINR that can be demodulated through a combined gain for each transceiver is -18 dB. Here, C1 combines two antenna elements into one subarray, and C2 combines four antenna elements into one subarray. Likewise, C3 means that eight antenna elements are bundled into one subarray.

Then, taking the same path loss as the path loss mentioned in (a) of FIG. 6, C1 and C2 have SINRs of -23 dB and -20 dB, respectively, so that coverage is not secured. However, as shown in FIG. 6C, when the subarray is extended and used according to the embodiment of the present invention, it can be seen that the coverage is 5 dB smaller than that shown in FIG. 6A. And in the case of C2 it can be seen that the coverage is 2dB smaller than the case shown in (a) of FIG.

This can secure the same SINR as C3 when the path loss is less than 167 dB of C2 and 164 dB of C1. However, if the path loss is greater than 169dB, coverage cannot be secured. Therefore, the subarray is configured so that the maximum coverage is 169 dB, so that the beamforming gain can be obtained regardless of the position of the terminal. This is shown in Table 1 below.

Subarray
Condition Antenna gain First Receive SINR Coverage Combined gain Second Receive SINR 2 × 1 7 dBi -23 dB × 18 dB -5 dB 4 × 1 10 dBi -20 dB × 15 dB -5 dB 6 × 1 13 dBi -17 dB ○ 12 dB -5 dB

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

Claims (16)

A method for setting a subarray composed of a plurality of antenna elements in a subarray setting system in multiple input multiple output (MIMO)
Mapping a first transceiver and a second transceiver, each of which comprises a first subarray and a second subarray each configured with a plurality of antenna elements, to transmit and receive signals with a plurality of terminals;
If the uplink received signal strength received by the first transceiver and the second transceiver is greater than or equal to a threshold value, the uplink signal transmitted to the first low noise amplifier of the first transceiver is introduced into the second low noise amplifier of the second transceiver. Determining merging of the first subarray and the second subarray; and
The second transceiver receives the first transceiver and the second transceiver so that the second transceiver of the second subarray receives the uplink signal received through the first subarray and the uplink signal received through the second subarray. Step 2 Mapping to Subarrays
Uplink subarray setting method comprising a. The method of claim 1,
Determining merging of the first subarray and the second subarray may include:
Comparing the number of first antenna elements of the sub-array receiving the downlink signal with the number of the second antenna elements of the sub-array transmitting the uplink signal,
If the number of first antenna elements and the number of second antenna elements are different and the uplink received signal strength is greater than a first threshold value among the thresholds, determining that the first subarray and the second subarray are merged; And
Switching an uplink signal flowing into the first low noise amplifier of the first transceiver to which the first subarray is connected flows into a second low noise amplifier of the second transceiver to which the second subarray is connected;
Uplink subarray setting method comprising a. The method of claim 2,
If the uplink received signal strength is less than the first threshold, checking whether the uplink received signal strength is greater than a second one of the thresholds;
If the uplink received signal strength is greater than the second threshold, determining to merge the first subarray with a second subarray; and
Switching an uplink signal flowing into the first low noise amplifier of the first transceiver to which the first subarray is connected flows into a second low noise amplifier of the second transceiver to which the second subarray is connected;
Uplink subarray setting method comprising a. The method of claim 3,
And the second threshold value is calculated by adding a gain obtained by merging the first threshold value with the first subarray and the second subarray. The method of claim 3,
If the uplink received signal strength is greater than the second threshold, uplink subarray setting method for maintaining the first subarray and the second subarray. The method of claim 3,
Determining merging of the first subarray and the second subarray may include:
Maintaining the first subarray and the second subarray when the number of the first antenna elements and the number of the second antenna elements are equal and the uplink received signal strength is greater than the second threshold.
Uplink subarray setting method comprising a. The method of claim 6,
If the uplink received signal strength is less than the second threshold, checking whether the output of the terminal transmitting the signal to the base station is maximum;
Determining that the first subarray and the second subarray are merged when the output of the terminal is maximum; and
Switching an uplink signal flowing into the first low noise amplifier to flow into the second low noise amplifier
Uplink subarray setting method comprising a. The method of claim 7, wherein
Generating a control signal to maximize the output of the terminal if the output of the terminal is not maximum;
Uplink subarray setting method comprising a. A system for setting a subarray composed of a plurality of antenna elements in a multiple input multiple output (MIMO),
An information collection module for collecting uplink received signal strength received by each of a plurality of transceivers installed in a base station; and
A first subarray and a second subarray each configured of a plurality of antenna elements are mapped to a first transceiver and a second transceiver. When the uplink received signal strength is greater than or equal to a threshold, the first subarray and the second subarray are mapped. A subarray set determination module for merging the first subarray and the second subarray such that an uplink signal transmitted to an array is introduced into a low noise amplifier of the second transceiver;
Uplink subarray setting system comprising a. The method of claim 9,
The subarray set determination module,
Comparing the number of first antenna elements of the sub-array receiving the downlink signal with the number of the second antenna elements of the sub-array transmitting the uplink signal,
An uplink that determines that the first subarray and the second subarray are merged when the number of the first antenna elements and the second antenna elements are different and the uplink received signal strength is greater than a first threshold value among the thresholds Subarray setting system. The method of claim 10,
The subarray set determination module,
If the uplink received signal strength is less than the first threshold but greater than the second threshold, it is determined to merge the first subarray and the second subarray.
And the second threshold value is calculated by adding a gain obtained by merging the first threshold value with the first subarray and the second subarray. The method of claim 10,
The subarray set determination module,
If the number of the first antenna element and the number of the second antenna element is the same, and the output of the terminal transmitting the uplink signal is the maximum, the uplink subarray setting system to determine to merge the first subarray and the second subarray . An antenna comprising a plurality of antenna elements,
A plurality of transceivers mapped to each of a plurality of subarrays each configured of at least two antenna elements of the plurality of antenna elements to amplify an uplink reception signal and a downlink reception signal,
A subarray set determination module for determining merging of at least two or more subarrays of the subarrays when the uplink received signal strengths respectively received by the plurality of transceivers are greater than a threshold; and
When it is determined that a merge of a first subarray and a second subarray of the plurality of subarrays is performed, a first low noise amplifier of the first transceiver to which the first subarray is mapped is mapped to the second subarray, whereby the first subarray is mapped to the second subarray. A switch for switching an uplink signal transmitted to the first subarray and the second subarray through a second low noise amplifier of a second subarray;
Base station comprising a. The method of claim 13,
Information collection module for collecting at least one information of the uplink received signal strength, terminal power information, path loss information received by each of the plurality of transceivers
Base station comprising a. The method of claim 13,
The plurality of transceivers,
And a low noise amplifier for amplifying the uplink received signal and a power amplifier for amplifying a downlink received signal, each of which is mapped to a plurality of subarrays. The method of claim 13,
The plurality of transceivers,
A low noise amplifier amplifying the uplink received signal and a first power amplifier and a second power amplifier amplifying a downlink received signal, respectively,
The first power amplifier is mapped to a first subarray, the second power amplifier is mapped to a second subarray, and the low noise amplifier is mapped to a first subarray and a second subarray.

Images