KR20190002274A - Base station apparatus for supporting transmission of multi-beam and signal transmission apparatus therof - Google Patents

Abstract

Disclosed are a base station apparatus for supporting multi-beam transmission and a signal transmitting apparatus which can save network construction costs and time. The base station apparatus comprises: a plurality of signal transmitting apparatuses for wirelessly transceiving a signal with a terminal connected through a wireless link; and a centralized apparatus physically separated from the plurality of signal transmitting apparatuses and processing a signal received from the terminal or a signal to be transmitted to the terminal through the signal transmitting apparatus. The plurality of signal transmitting apparatuses are interconnected in a cascade manner, and one of the plurality of signal transmitting apparatuses is physically connected to the centralized apparatus to perform multi-beam transmission for the terminal.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a base station apparatus and a signal transmission apparatus supporting multi-beam transmission,

The present invention relates to a base station apparatus and a signal transmission apparatus that support multi-beam transmission.

Recently, standardization of 5G (5G) mobile communication system is being promoted in order to effectively accommodate exponentially increasing traffic demands and various future mobile services.

In this fifth generation mobile communication system, the millimeter wave (mmWave, 10 GHz to 300 GHz) band is considered as the NR (New Radio) frequency in order to secure the ultra wide band. However, Beam forming technology with high directivity is essential to ensure coverage at the level of existing LTE, because large, atmospheric, water vapor, terrain, and attenuation due to earth are large.

Particularly, in the fifth generation mobile communication system, in order to solve the link blockage problem due to obstacles due to the characteristics of the millimeter wave channel and the problem of beam tracking failure for the terminal due to high-speed movement, it is possible to apply a multi-beam technique for multiplexing a wireless link by transmitting a beam from two or more transmission points 1 and 2 to the terminal 3, as shown in FIGS.

Meanwhile, 3GPP is also discussing a 5G network design method that adopts Cloud-RAN (Radio Access Network) technology to maximize network efficiency. Cloud-RAN is a technology that accepts data processing part among base station elements in a cloud server group composed of general-purpose hardware, and processes signals and traffic in the cloud. 2, a part of a baseband function of a base station may be centralized / virtualized in a central unit (CU) 4, and a common CU pool may be provided to allocate resources And the hardware cost can be reduced by constructing only the distributed unit (DU) 5 at the cell site.

In the 3GPP, performance analysis according to the functional separation between the CU 4 and the DU 5 is performed. As a result, the Packet Data Convergence Protocol (PDCP) layer and the RRC (Radio Resource Control) function are placed in the CU 4, (Radio Link Control) layer, a Medium Access Control (MAC) layer, a PHY (Physical) layer, an RF (Radio Frequency), and an antenna configuration and scheduling function. The CU 4 and the DU 5 are connected via an interface (CU-DU I / F (F1)) 6, and an optical cable or a high-speed wireless transmission device can be used as the interface.

Meanwhile, when the base station is composed of the CU 4 and the DU 5 as described above, a plurality of DUs are required to apply the multi-beam technique to the UE. 3, two DUs 7 and 8 are used to apply the multi-beam technique to the terminal 3, and the connection network of the CU 9 and the DUs 7 and 8 is a star, Can be constructed. In this star structure, the cost of establishing leased lines for connection between CU (9) and DU (7, 8) increases as the number of DUs increases.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a base station device and a signal transmission device supporting multi-beam transmission capable of reducing network construction cost and time.

According to an aspect of the present invention,

A base station apparatus supporting multi-beam transmission, comprising: a plurality of signal transmission apparatuses capable of transmitting and receiving wireless signals to and from a terminal connected via a wireless link; And a centralized device physically separated from the plurality of signal transmission devices and performing processing of a signal received from the terminal or a signal to be transmitted to the terminal through the signal transmission device, The apparatuses are connected to each other in a cascade manner, and one of the plurality of signal transmission apparatuses is physically connected to the centralized apparatus to perform multi-beam transmission to the terminal.

Here, in order for the plurality of signal transmission apparatuses to function as one logical signal transmission apparatus, the one signal transmission apparatus operates as a master signal transmission apparatus, and the one of the plurality of signal transmission apparatuses And the remaining signal transmission apparatus operates as a slave apparatus.

When the remaining signal transmission apparatuses are two or more, a signal transmission apparatus having a small number of connection hops from the remaining signal transmission apparatuses to the one signal transmission apparatus is physically connected to the one signal transmission apparatus.

Also, a signal transmission apparatus that is not physically connected to the one signal transmission apparatus among the remaining signal transmission apparatuses may support transparent backhaul routing of a signal transmission apparatus physically connected to the one signal transmission apparatus To the signal transmission device.

Also, in order for the plurality of signal transmission apparatuses to function as two or more logical signal transmission apparatuses, a plurality of signal transmission apparatuses corresponding to the two or more logical signal transmission apparatuses among the plurality of signal transmission apparatuses, More than one signal transmission device acts as a master device and is connected to the centralized device through the transmission backhaul routing support of the one signal transmission device.

According to another aspect of the present invention,

A signal transmission apparatus capable of transmitting and receiving radio signals with a terminal connected through a radio link in a base station apparatus supporting multi-beam transmission, comprising: a first interface supporting signal transmission with a centralized apparatus, Performing processing of a signal received from the terminal or a signal to be transmitted to the terminal through the signal transmission device; A second interface supporting a cascade connection with another signal transmission device; And a multi-beam transmission controller for performing multi-beam transmission to the terminal in cooperation with at least one other signal transmission apparatus connected in a cascade manner via the second interface.

Here, the channel state collecting unit may collect channel states of links of the multiple beams transmitted to the terminal. And a beam management unit for managing links of the multiple beams, wherein the multi-beam transmission control unit controls the multi-beam transmission unit based on the channel states of the links of the multiple beams collected by the channel status collecting unit, And controls multi-beam transmission to the terminal by controlling links of multiple beams.

The at least one other signal transmission device, which is cascade-connected via the second interface, is operatively connected to the signal transmission device via a second interface, the signal transmission device being physically connected to the centralized device through the first interface, When operating as a slave signal transmission device, the slave transmission device performs multi-beam transmission to the terminal together with the master signal transmission device under the control of the multi-beam transmission control part.

When at least one of the at least one other signal transmission apparatus is connected to the master signal transmission apparatus, the signal transmission apparatus having a small number of hops from the at least one other signal transmission apparatus to the master signal transmission apparatus is physically connected to the master signal transmission apparatus do.

The signal transmission apparatus physically connected to the master signal transmission apparatus may further include a signal transmission apparatus that is not physically connected to the master signal transmission apparatus among the at least one other signal transmission apparatus, And supports transparent backhaul routing to connect to the device.

In addition, the signal transmission device may be physically connected to the centralized device via the first interface to function as a master signal transmission device, and the at least one other signal transmission device connected in a cascade manner through the second interface When the at least one signal transmission device operates as another master device, the second interface supports transmission backhaul routing so that the at least one signal transmission device is connected to the centralized device via the first interface.

In addition, the multi-beam transmission control unit performs load adjustment for traffic transmitted through the multi-beam dynamically according to a channel state of a multi-beam link collected by the channel state collecting unit.

Further, the multi-beam transmission control unit may be configured as follows:

       BPS_CS_factor = Modulation order in BPL ㅧ Code rate ㅧ Rank (number of ranks)

      Here, BPL is a multi beam link (Beam Pair Link)

(BPS_CS_factor) calculated by the BPL channel state parameter (BPS_CS_factor).

According to another aspect of the present invention,

A signal transmission apparatus capable of transmitting and receiving radio signals with a terminal connected by a radio link in a base station apparatus supporting multi-beam transmission, the apparatus comprising: a first transmitter, a second transmitter, a communicator, a memory and a processor, Wherein the centralized device is physically separated from the signal transmission device and supports signal transmission between the signal transmission device and a signal received from the terminal or a signal to be transmitted to the terminal, 2 transmitter supports a cascaded connection with another signal transmission device, the communicator performing radio signal transmission and reception with the terminal, the memory being configured to store a set of codes, the code being transmitted via the first transmitter Performing signal transmission with the centralized device; Performing signal transmission with another signal transmission device cascaded through the second transmitter; Performing wireless signal transmission / reception with the terminal through the communicator; And controlling the processor to perform an operation of performing multi-beam transmission to the terminal in cooperation with the other signal transmission apparatus connected through the second transmitter.

Here, the processor may include: collecting channel states of the multiple beams; And performing load adjustment for traffic transmitted through the multiple beams dynamically according to the channel state of the multi-beam collected.

When the other signal transmission apparatus connected through the signal transmission apparatus and the second transmission apparatus operates as one logical signal transmission apparatus, the one logical signal transmission apparatus performs multi-beam transmission for one terminal And further executes the control operation.

In addition, the processor may be configured such that, when the other signal transmission device connected through the signal transmission device and the second transmission device operates as a plurality of logical signal transmission devices, the logical signal transmission device including the signal transmission device Controlling to perform multi-beam transmission for the multi-beam transmission; And supporting a transparent backhaul routing so that a logical signal transmission device not including the signal transmission device is connected to the centralized device.

According to the embodiment of the present invention, in a beamforming-based next generation mobile communication system, multi-beam based transmission can secure the trust of the link between the base station and the terminal and improve the capacity.

In addition, a plurality of DUs can be cascade-connected to easily extend the network coverage, thereby saving network construction cost and time.

1 is a diagram showing an example of a general multi-beam transmission.
2 is a diagram showing a configuration of an example of Cloud-Ran.
FIG. 3 is a diagram showing an example of Cloud-Ran constructed as a general star type.
4 is a diagram schematically illustrating an example of a configuration of a base station apparatus according to an embodiment of the present invention.
5 is a diagram illustrating another exemplary configuration of a base station apparatus according to an embodiment of the present invention.
6 is a detailed block diagram of a DU according to an embodiment of the present invention.
FIG. 7 is a flowchart illustrating a process of setting up multi-beam transmission for a terminal according to an embodiment of the present invention.
8 is a diagram illustrating an example of traffic load adjustment according to a channel condition of a multi-beam in a base station apparatus according to an embodiment of the present invention.
9 is a schematic block diagram of a DU of a base station apparatus according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly explain the present invention, parts not related to the description are omitted, and like parts are denoted by similar reference numerals throughout the specification

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

Also, the terms " part, "" module," and " module ", etc. in the specification mean a unit for processing at least one function or operation and may be implemented by hardware or software or a combination of hardware and software have.

Hereinafter, a base station apparatus for multi-beam transmission according to an embodiment of the present invention will be described with reference to the drawings.

4 is a diagram schematically illustrating an example of a configuration of a base station apparatus according to an embodiment of the present invention.

As shown in FIG. 4, the base station apparatus according to the embodiment of the present invention uses two DUs 20 and 30 for multi-beam transmission to the terminal 10, and the DUs 20 and 30 are cascade- and the DU 20 of one of the two DUs 20 and 30 is connected to the CU 40. [ At this time, the DU 20 connected to the CU 40 through a dedicated line becomes the master DU 20 operating in the master mode, and the remaining DU 30 operates in the slave mode, (30) controlled by the control unit (20). Here, the two DUs 20 and 30 operate as one logical DU 50. In order to perform multi-beam transmission to the terminal 10, two DUs 20 and 30 having a distance from each other are referred to as a Transmission Reception Point (TRP), and transmitters 20 and 30 and terminals 10 ) Is called a beam pair link (BPL) (BPL1, BPL2)).

As described above, according to the embodiment of the present invention, a plurality of DUs 20 and 30 for performing multi-beam transmission to a terminal are cascade-connected, thereby greatly reducing the cost of constructing a leased line.

4, since the configuration of the base station apparatus shown in FIG. 4 is merely an embodiment of the present invention, the present invention is not limited to FIG. 4, have. For example, referring to FIG. 5, a configuration example of another base station apparatus according to an embodiment of the present invention is shown. 5 (a), three DUs 21, 31 and 32 are used. Of these, only the master DU 21 is connected to the CU 11, and the remaining two slaves DU 31 and 32 are master (21) are cascaded together. At this time, the three DUs 21, 31, and 32 operate as one logical DU 51. Further, when two slaves DU 31 and 32 are connected to the master DU 21, a slave DU (in this case, the slave DU 31) with a small number of connected hops to the master DU 21 is the master DU 21 And the rest of the slave DUs 32 are cascaded to the master DU 21 and then sent back to the master DU 21 through the transparent backhaul routing support of the slave DU 21 Can be connected. That is, the slave DU 31 physically connected to the master DU 21 transmits messages or traffic between the master DU 21 and another slave DU 32 connected to the master slave cascade to each other without processing it, The effect that the slave DU 32 is connected to the master DU 21 can be provided. 5 (b), three DUs 22, 23 and 33 are used, but two master DUs 22 and 23 are used, the remaining one is used as a slave DU 33, and three DUs 22, 23, 33 are cascaded with each other. One master DU 22 of three DUs 22, 23 and 33 operates as one logical DU 52 and the remaining two DUs 23 and 33 operate as one logical DU 53 As a result, there are two logical DUs 52 and 53 in this structure. It should be noted here that not two master DUs 22 and 23 are connected to the CU 12 but only one master DU 22 out of the two master DUs 22 and 23 is connected to the CU 12, The remaining master DU 23 cascaded to the DU 22 can be connected to the CU 12 through the transparent backhaul routing support of the master DU 22. That is, the master DU 22 physically connected to the CU 12 transmits the message or traffic between the master DU 23 and the CU 12, which are cascade-connected to it, to each other without processing it, (23) is connected to the CU (12). In addition, a plurality of DUs may be included in the base station, and a structure of a plurality of logical DUs may be used through various types of cascade connection with reference to the example shown in FIG.

Hereinafter, a specific configuration of the DU according to the embodiment of the present invention will be described.

6 is a detailed block diagram of a DU according to an embodiment of the present invention.

6, the DU 100 includes a CU interface 110, a DU interface 120, a basic processing unit 130, a cell configuration unit 140, a multi-beam transmission control unit 150, a beam management unit 160 And a channel state collecting unit 170. Since the DU 100 shown in FIG. 6 is only one embodiment of the present invention, the present invention is not limited to FIG. 6, and the DU 100 may be configured differently from FIG. 6 according to various embodiments of the present invention. have.

The CU interface 110 performs an interface function for connection with the CU 200. This CU interface 110 is used only when the DU 100 is physically connected to the CU 200 while operating as a master DU.

The DU interface 120 performs an interface function for a cascade connection with another DU. The DU interface 120 may be connected to another slave DU or master DU when included in the master DU. When the DU interface 120 is connected to another slave DU, it receives the configuration information of the connected slaves DU, receives the collected BPL channel information from the terminal, and transmits a BPL add / release / change related message between the master DU and the slave And transmits up-down traffic between master DU and relay DU. When the DU interface 120 is connected to another master DU, only the transparent backhaul routing is performed for transmission of messages or traffic between the other master DU and the CU 200.

On the other hand, when the DU interface 120 is included in the slave DU, it can be connected to the master DU or another slave DU. When the DU interface 120 is connected to the master DU, it transmits configuration information of the slave DU to the master DU, transmits the collected BPL channel information from the terminal to the master DU, adds / removes the BPL between the master DU and the slave UDI, Receives the change related message, and also transmits the up-down traffic between the master DU and the relay device. When the DU interface 120 is connected to another slave DU, only the transparent backhaul routing is performed for the message or traffic transmission between the master DU and the other slave DU.

The basic processing unit 130 processes the basic functions of the DU 100 corresponding to the CU 200. Basic functions include RLC processing function, MAC processing function, PHY processing function, RF and antenna function. Since the basic processing functions are well known, a detailed description thereof will be omitted here.

The cell configuration unit 140 performs synchronization signal and common channel transmission / reception management according to the cell configuration information received from the CU 200.

When the DU 100 including the cell configuration unit 140 is the master DU, it controls and manages the configuration of the lower slave DU cascaded via the DU interface 120.

However, if the DU 100 including the cell configuration unit 140 is the slave UDI, the synchronization signal and common channel transmission / reception are set in accordance with the configuration information received from the upper master DU cascaded via the DU interface 120. [

The multi-beam transmission controller 150 controls the multi-beam transmission function for the terminal. That is, it controls the activation and deactivation of each BPL of a multi-beam transmission target terminal, determines a radio resource allocation policy for each BPL for the corresponding terminal, and also determines a BPL- Performs traffic load balancing.

The beam manager 160 manages the beam used for the terminal in the DU 100, specifically, the BPL. For example, the beam management unit 160 collects channel information per BPL periodically or as needed for beam tracking. Specifically, the beam management unit 160 instructs the terminal to report the beam-state channel state information, for example, CSI (Channel State Information), and collects the CSI for each BPL transmitted from the terminal. Also, the beam manager 160 performs activation and deactivation of each BPL.

The channel state collecting unit 170 collects channel information reported from the terminal according to the control of the beam manager 160. [ Specifically, the channel status collecting unit 170 collects channel measurement information and SRS measurement information reported from the UE through a Physical Uplink Control Channel (PUCCH) or a Physical Uplink Shared CHannel (PUSCH). The CSI-RS (Channel State Information-Reference Signal) or SRS (Sounding Reference Signal) is used as a reference signal for beam measurement. However, in the description of the embodiment of the present invention, But the present invention is not limited thereto.

Hereinafter, a process of setting up a multi-beam transmission for a terminal by a base station apparatus according to an embodiment of the present invention will be described. For convenience of description, as shown in FIG. 4, a base station apparatus including one CU and two DUs is used. However, it should be noted that the embodiment of the present invention is not limited to FIG. It will be readily understood by those skilled in the art. The DU will be described using the constituent elements shown in Fig. 6, and the constituent elements not used in the description of this embodiment will be omitted.

FIG. 7 is a flowchart illustrating a process of setting up multi-beam transmission for a terminal according to an embodiment of the present invention.

Referring to FIG. 7, a master DU 100 is physically connected to a CU 200, and a slave DU 300 is cascade-connected to a master DU 100.

First, before description, each TRP, namely, DU (100, 300) sweeps a plurality of beams and transmits different reference signals for each beam in order to determine whether to transmit multiple beams at the RRC layer located in the CU 200 RS 400 transmits the CSI-RS transmission command and the multi-beam setting command while transmitting the allocation information to the corresponding TRP, reports the beam measurement information for each CSI-RS group as an RRC message It is assumed that the CU 200 determines multi-beam transmission based on the measurement result.

Accordingly, the CU 200 instructs the master DU 100 to perform multi-beam transmission according to the multi-beam transmission decision (SlOO).

As described above, the multi-beam transmission control unit 150 of the master DU 100 receiving the multi-beam transmission command from the CU 200 to the terminal 400 receives the BPL (BPL1) between the master DU 100 and the terminal 400 And a BPL (BPL2) between the slave DU 300 and the terminal 400 (S110).

The multi-beam transmission controller 150 determines activation and deactivation of the two BPLs and beam modification in the TRP (S120). These determinations are transmitted to the beam managers 160 and 360, respectively.

The beam management units 160 and 260 of the master DU 100 and the slave DU 300 periodically or optionally transmit the corresponding BPL to the terminal 400 in accordance with the control of the multi beam transmission control unit 150 The channel information collection units 170 and 370 collect the channel information for each BPL from the terminal 400 in step S140. At this time, if the terminal 400 is in the multi-beam transmission mode, the channel information collectors 170 and 370 transmit the collected CSI for each BPL to the multi-beam transmission controller 150 (S150).

The multi-beam transmission control unit 150 collects the CSIs for each BPL and activates the BPL channel when the BPL channel condition is good, and commands the corresponding beam management units 160 and 360 to activate the BPL and start data transmission / reception service (S160).

If the channel condition of one BPL is not good, the multi-beam transmission control unit 150 can determine the inactivation of the corresponding BPL. Here, if the reference signal received power (RSRP) for a good beam in the TRP becomes equal to or greater than a predetermined threshold value, the corresponding BPL is activated, and if the RSRP of the currently serving BPL becomes less than a predetermined threshold value, the BPL is inactivated.

The multi beam transmission controller 150 can change the detailed beam when the terminal 400 moves within the same TRP transmission range and can determine the changed beam according to the good beam information reported from the terminal 400. [

As described above, the base station apparatus according to the present invention supports the multi-beam transmission to the terminal 400 using a plurality of DUs 100 and 300 cascaded to each other, thereby enabling the CU 200 and the DUs 100, 300) can be reduced, resulting in an easy extension of network coverage, and a reduction in network construction cost and time.

Also, by performing multi-beam transmission, the reliability of the link between the base station and the terminal can be ensured and the transmission capacity can be improved.

Meanwhile, in FIG. 7, the multi-beam transmission controller 150 can adjust the traffic load according to the channel conditions of activated BPLs. That is, the multi-beam transmission controller 150 can adjust the load of the traffic transmitted through the BPL1 and BPL2 according to the channel conditions for the BPL1 and BPL2, which are links with the terminal 400. [

Specifically, the multi-beam transmission controller 150 aggregates CSI, which is channel state information for each BPL, and dynamically adjusts the load on uplink and downlink traffic according to the BPL channel status. For example, the traffic distribution for the BPLs may be determined according to the ratio of the BPL channel context factor (BPL_CS_factor), such as Equation (1).

[Equation 1]

BPS_CS_factor = Modulation order in the BPL ㅧ Code rate ㅧ Rank (number of ranks)

An example in which the traffic is distributed by the load adjustment of the multi-beam transmission control unit 150 is shown in FIG.

8 is a diagram illustrating an example of traffic load adjustment for multiple beams according to channel conditions in a base station according to an embodiment of the present invention.

8, the link between the master DU 100 and the terminal 400 is BPL1, and the link between the slave DU 300 and the terminal 400 is BPL2.

In FIG. 8A, BPL1 and BPL2 have similar channel conditions, indicating that similar traffic is distributed to BPL1 and BPL2 according to traffic load adjustment by the multi-beam transmission controller 150. FIG.

In FIG. 8B, it is shown that the channel condition of BPL2 is better than that of BPL1, so that BPL2 has received more traffic than BPL1.

In the case of (c) in FIG. 8, the channel condition of BPL1 is in a bad state. That is, since the channel condition of BPL1 is less than a predetermined threshold value, the corresponding BPL1 is inactivated and thus all traffic is distributed only to BPL2. In this case, it can be seen that the multi-beam transmission function for the terminal 400 is not performed.

Generally, since the channel conditions of BPL1 and BPL2 are likely to be similar or slightly different, multi-beam transmission to the terminal 400 according to the case of FIG. 8 (a) or (b) will be applied.

(Modulation and Coding Scheme) of BPL1 is (modulation order: QPSK, coding rate: 1/2, rank number: 1), and the MCS of BPL2 is (modulation order : BPL1_CS_factor: BPL2_CS_factor = 1: 6 according to Equation (1) when the channel condition of BPL2 is better than the channel condition of BPL1 as the channel condition of the BPL2 is 64QAM, the coding rate is 1/2, If the channel condition of the BPL2 is good, the traffic transmission rate is also determined accordingly, and the downlink is set according to the determined ratio, so that the master DU 100 corresponding to BPL1: the slave DU 300 300 = 1: It is possible to distribute a lot of traffic, that is, an RLC PDU (Packet Data Unit).

Next, the DU of the base station apparatus according to another embodiment of the present invention will be described.

9 is a schematic block diagram of a DU of a base station apparatus according to another embodiment of the present invention.

Referring to FIG. 9, a DU 500 of a base station apparatus according to another embodiment of the present invention includes a first transmitter 510, a second transmitter 520, a communicator 530, a memory 540, a processor 550, And a bus 560.

The first transmitter 510 is physically connected to a CU (not shown) of the base station apparatus and performs signal transmission with the CU.

The second transmitter 520 is cascaded with another DU to perform signal transmission with another DU.

The communicator 530 performs mobile communication with a terminal (not shown) through a mobile communication network.

The memory 540 is configured to store a set of codes, which code is used to control the processor 550 to perform the following operations. This operation may be performed by performing operations to perform signal transmission with a CU (not shown) via the first transmitter 510, perform signal transmission with another DU cascaded through the second transmitter 520, (Not shown) via the second communicator, controlling cell configuration with another DU cascaded via the second communicator when operating as a master DU, controlling the cell configuration with another DU connected via the second communicator, And cooperating to perform multi-beam transmission to a terminal (not shown).

Optionally, the operation further comprises performing load balancing of traffic according to channel conditions for a link (BPL) connected to a terminal (not shown).

The memory 540 may include a read only memory (ROM), a random access memory (RAM), and a non-volatile random access memory (NVRAM). The processor 550 may also be referred to as a controller, a microcontroller, a microprocessor, a microcomputer, or the like. In addition, the processor 550 may be implemented by hardware or firmware, software, or a combination thereof.

The bus 560 is configured to combine all the components of the DU 500: the first transmitter 510, the second transmitter 520, the communicator 530, the memory 540, and the processor 550.

The embodiments of the present invention described above are not implemented only by the apparatus and method, but may be implemented through a program for realizing the function corresponding to the configuration of the embodiment of the present invention or a recording medium on which the program is recorded.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

Claims (17)

A base station apparatus supporting multi-beam transmission,
A plurality of signal transmission apparatuses capable of transmitting and receiving wireless signals with terminals connected through a wireless link; And
And a centralized unit physically separated from the plurality of signal transmission apparatuses and performing processing of a signal received from the terminal or a signal to be transmitted to the terminal through the signal transmission apparatus,
The plurality of signal transmission apparatuses are connected to each other in a cascade manner, and one signal transmission apparatus of the plurality of signal transmission apparatuses is physically connected to the centralized apparatus and performs multi-beam transmission to the terminal
Base station apparatus. The method according to claim 1,
Wherein the plurality of signal transmission apparatuses operate as one logical signal transmission apparatus, the one signal transmission apparatus operates as a master signal transmission apparatus, and the remaining signals excluding the one signal transmission apparatus among the plurality of signal transmission apparatuses A transmission device operates as a slave device,
Base station apparatus. 3. The method of claim 2,
Wherein a signal transmission device having a small number of connection hops from the remaining signal transmission devices to the one signal transmission device is physically connected to the one signal transmission device when the remaining signal transmission devices are two or more,
Base station apparatus. The method of claim 3,
A signal transmission apparatus that is not physically connected to the one signal transmission apparatus among the remaining signal transmission apparatuses supports transparent backhaul routing of a signal transmission apparatus physically connected to the one signal transmission apparatus, Connected to one signal transmission device,
Base station apparatus. The method according to claim 1,
Wherein the plurality of signal transmission apparatuses operate as two or more logical signal transmission apparatuses, wherein at least two signal transmission apparatuses other than the one signal transmission apparatus among the plurality of signal transmission apparatuses corresponding to the two or more logical signal transmission apparatuses And a signal transmission device, each of which operates as a master device, is connected to the centralized device through the transmission backhaul routing support of the one signal transmission device,
Base station apparatus. A signal transmission apparatus capable of transmitting and receiving a radio signal to and from a terminal connected through a radio link in a base station apparatus supporting multi-beam transmission,
A first interface for supporting signal transmission with a centralized device, the centralized device being physically separated from the signal transmission device, the signal being transmitted from the terminal through the signal transmission device or a signal to be transmitted to the terminal Processing is performed;
A second interface supporting a cascade connection with another signal transmission device; And
A multi-beam transmission control unit for performing multi-beam transmission to the terminal in cooperation with at least one other signal transmission apparatus connected in a cascade manner via the second interface,
And a signal transmission device. The method according to claim 6,
A channel state collecting unit for collecting a channel state of a link of multiple beams transmitted to the terminal; And
A beam managing unit for managing links of the multiple beams,
Further comprising:
Wherein the multi-beam transmission control unit comprises:
And controlling the multi-beam transmission to the terminal by controlling links of the multiple beams through the beam manager based on a channel state of a link of the multi-beam collected by the channel status collecting unit.
Signal transmission device. The method according to claim 6,
Wherein the signal transmission device is physically connected to the centralized device via the first interface and acts as a master signal transmission device, and the at least one other signal transmission device, which is cascaded via the second interface, The slave transmission apparatus performs multi-beam transmission to the terminal together with the master signal transmission apparatus under the control of the multi-beam transmission control unit,
Signal transmission device. 9. The method of claim 8,
Wherein a signal transmission device having a small number of hops from the at least one other signal transmission device to the master signal transmission device is physically connected to the master signal transmission device when the at least one other signal transmission device is two or more,
Signal transmission device. 10. The method of claim 9,
A signal transmission apparatus physically connected to the master signal transmission apparatus transmits a signal transmission apparatus that is not physically connected to the master signal transmission apparatus among the at least one other signal transmission apparatus to the master signal transmission apparatus through the second interface Supports transparent backhaul routing to connect,
Signal transmission device. The method according to claim 6,
Wherein the signal transmission device is physically connected to the centralized device via the first interface to act as a master signal transmission device and is operable to transmit at least one of the at least one other signal transmission device connected in a cascade manner via the second interface Wherein the second interface supports transmission backhaul routing so that the at least one signal transmission device is connected to the centralized device via the first interface when the signal transmission device of the second interface operates as a different master device.
Signal transmission device. 8. The method of claim 7,
Wherein the multi-beam transmission control unit performs load adjustment on traffic transmitted through the multi-beam dynamically according to a channel state of a link of a multi-beam collected by the channel state collecting unit,
Signal transmission device. 13. The method of claim 12,
The multi-beam transmission controller may calculate the multi-
BPS_CS_factor = Modulation order in BPL ㅧ Code rate ㅧ Rank (number of ranks)
Here, BPL is a multi beam link (Beam Pair Link)
(BPS_CS_factor) calculated by the BPL channel state factor (BPS_CS_factor)
Signal transmission device. A signal transmission apparatus capable of transmitting and receiving a radio signal to and from a terminal connected through a radio link in a base station apparatus supporting multi-beam transmission,
A first transmitter, a second transmitter, a communicator, a memory and a processor,
The first transmitter is a centralized device, wherein the centralized device is physically separated from the signal transmission device and performs processing of a signal received from the terminal or a signal to be transmitted to the terminal through the signal transmission device. Signal transmission,
The second transmitter supports a cascade connection with another signal transmission device,
The communicator performs wireless signal transmission / reception with the terminal,
The memory being configured to store a set of codes,
The code includes:
Performing signal transmission with the central concentrator through the first transmitter;
Performing signal transmission with another signal transmission device cascaded through the second transmitter;
Performing wireless signal transmission / reception with the terminal through the communicator; And
Performing multi-beam transmission to the terminal in cooperation with the other signal transmission apparatus connected through the second transmitter
Lt; RTI ID = 0.0 > a < / RTI > processor,
Signal transmission device. 15. The method of claim 14,
The processor comprising:
Collecting channel states of the multiple beams; And
And performing load adjustment for traffic transmitted through the multi-beam dynamically according to a channel state of the multi-beam to be collected,
Signal transmission device. 15. The method of claim 14,
When the other signal transmission apparatus connected through the signal transmission apparatus and the second transmission apparatus operates as one logical signal transmission apparatus, the one logical signal transmission apparatus controls to perform multi-beam transmission for one terminal To further perform the action,
Signal transmission device. 15. The method of claim 14,
The processor comprising:
When the other signal transmission apparatus connected through the signal transmission apparatus and the second transmission apparatus operates as a plurality of logical signal transmission apparatuses, the logical signal transmission apparatus including the signal transmission apparatus performs multi-beam transmission to the terminal ; And
An operation for supporting transmission backhaul routing so that a logical signal transmission device not including the signal transmission device is connected to the centralized device
Further comprising:

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