KR101397663B1 - Mobile communication system for supporting multiple input and multiple output - Google Patents

Abstract

A mobile communication system supporting a multiple antenna scheme is disclosed.
The system comprises a digital signal processing device connected to the core system for processing a wireless digital signal and a digital signal processing device physically separated from the digital signal processing device and converting and amplifying the digital signal received from the digital signal processing device, The base station transmits the amplified signal to the terminal based on the multi-antenna technology using the antenna, receives a signal transmitted from the terminal based on the multi-antenna technology using the two antennas, Processing apparatus. Here, when two adjacent radio signal processing apparatuses transmit reference signals to terminals located in a mutual boundary area, two antennas transmit two reference signals of different patterns to each other, and all of the two radio signal processing apparatuses And transmits a handover reference signal R0 as a reference for determining whether or not to perform a handover.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a mobile communication system supporting multiple antennas,

The present invention relates to a mobile communication system supporting a multi-antenna scheme.

Generally, a communication base station is largely included in one physical system together with a digital signal processing unit and a radio signal processing unit. However, such a system has a limitation in the optimization of the cell design because the base station including all the processing units must be installed in the cell. To improve this, a plurality of antennas are connected to a single base station, and cells are formed in a required manner to reduce a coverage hole.

However, this approach allows efficient cell design, but it is difficult to maximize system capacity. Therefore, a new structure and transmission method of the base station is needed to maximize the radio capacity.

SUMMARY OF THE INVENTION The present invention provides a mobile communication system capable of supporting a 4x2 multi-antenna scheme regardless of a position of a terminal.

It is another object of the present invention to provide a mobile communication system in which the performance of data demodulation in a terminal is not problematic.

A mobile communication system according to an aspect of the present invention includes:

A digital signal processing device connected to the core system for processing a wireless digital signal; And converting the digital signal received from the digital signal processor into a digital signal and transmitting the amplified signal to the terminal based on a multi-antenna technique using two antennas, A plurality of wireless signal processing apparatuses for receiving signals transmitted from a terminal based on a multi-antenna technology using a plurality of antennas and transmitting the signals to the digital signal processing apparatus, wherein two adjacent wireless signal processing apparatuses are located in a mutual boundary area When transmitting a reference signal to a mobile station, two antennas transmit two reference signals of different patterns to the mobile station, and all of the two radio signal processing apparatuses transmit a handover reference signal R0 And transmits the data.

Here, the patterns of the reference signals transmitted by the respective antennas for the two radio signal processing apparatuses are different from each other.

A data signal is allocated so that a data signal is not transmitted from each antenna of one of the two radio signal processing apparatuses.

In addition, two types of data signals having phases of 180 degrees are allocated to the respective antennas of the one wireless signal processing apparatus.

In addition, the cells to which the two radio signal processing apparatuses belong are characterized in that the physical cell identifiers that determine the positions of reference signals used for each cell are the same.

In addition, the two radio signal processing devices transmit four different reference signals R0, R1, R2, and R3, respectively.

A mobile communication system according to another aspect of the present invention includes:

A first base station included in each of two adjacent cells, wherein the first base station includes a first antenna and a second antenna, and a second base station, wherein the second base station includes a third antenna and a fourth antenna, Wherein the first antenna, the second antenna, the third antenna, and the fourth antenna each transmit reference signals of two different patterns, and the first antenna, the second antenna, the third antenna, One of the reference signals allocated to the first antenna and the second antenna is a handover reference signal R0 that is a reference for determining whether to perform a handover, And one of the reference signals allocated to the third antenna and the fourth antenna is the handover reference signal R0.

Here, the reference signals allocated to the first antenna are R0 and R1, the reference signals allocated to the second antenna are R2 and R3, the reference signals allocated to the third antenna are R0 and R2, And the reference signals allocated to the antennas are R1 and R2.

A data signal is allocated such that a phase of data signals transmitted through the first antenna is 180 degrees and a phase of data signals transmitted through the second antenna is 180 degrees.

A data signal is allocated so that a phase of data signals transmitted through the third antenna is 180 degrees and a data signal is allocated such that a phase of data signals transmitted through the fourth antenna is 180 degrees.

A mobile communication system according to another aspect of the present invention includes:

A digital signal processing device connected to the core system for processing a wireless digital signal; And converting the digital signal received from the digital signal processor into a digital signal and transmitting the amplified signal to the terminal based on a multi-antenna technique using two antennas, And a plurality of radio signal processing apparatuses for receiving a signal transmitted from a terminal based on a multi-antenna technology using a plurality of antennas and transmitting the signals to the digital signal processing apparatus, wherein a plurality of cells each including the radio signal processing apparatus are arranged Wherein the radio signal processing apparatuses for transmitting the same reference signals are arranged far away from the radio signal processing apparatuses for transmitting different reference signals, and the two radio signal processing apparatuses adjacent to each other among the plurality of radio signal processing apparatuses Is located in the mutual boundary area When transmitting a reference signal to a mobile station, the two antennas included in each of the two radio signal processing apparatuses transmit two reference signals of different patterns to each other, And transmits a handover reference signal R0 serving as a criterion of judgment.

Here, the plurality of cells are arranged in a line.

In addition, two types of reference signal patterns are alternately assigned to the plurality of cells arranged in a row, and each of the plurality of cells includes a reference signal And the reference signal is transmitted according to the pattern.

In addition, the physical cell identifiers of the plurality of cells arranged in a row are the same.

A mobile communication system according to another aspect of the present invention includes:

A digital signal processing device connected to the core system for processing a wireless digital signal; And converting the digital signal received from the digital signal processor into a digital signal and transmitting the amplified signal to the terminal based on a multi-antenna technique using two antennas, And a plurality of radio signal processing apparatuses for receiving a signal transmitted from a terminal based on a multi-antenna technique using a plurality of antennas and transmitting the signal to the digital signal processing apparatus, Wherein the two radio signal processing apparatuses adjacent to each other in the radio signal processing apparatuses included in the cells arranged in the same row among the plurality of cells respectively transmit the reference signals And is included in each of the two radio signal processing apparatuses at the time of transmission Each of the two antennas transmits a reference signal of two patterns different from each other to the terminal, and all of the two radio signal processing apparatuses transmit a handover reference signal R0 as a reference for determining whether to perform a handover .

Here, two kinds of reference signal patterns are alternately assigned to a plurality of cells arranged in the same row, and each of the plurality of cells includes a reference signal pattern And transmits the reference signal according to the reference signal.

In addition, the plurality of cells arranged in the same row have the same physical cell identifiers, but have different physical cell identifiers for each row.

According to the present invention, it is possible to support the 4x2 multi-antenna scheme regardless of the position of the UE between two adjacent cells.

In addition, in a multi-cell environment of three or more cells, cells can be configured in a linear form or a two-dimensional form, so that there is no problem in data demodulation performance of the terminal.

1 is a schematic configuration diagram of a network according to an embodiment of the present invention.
2 is a diagram illustrating an example of providing a 4x2 multi-antenna scheme through a plurality of RUs.
3 is a diagram illustrating a case where terminals are adjacent to one RU among two adjacent RUs.
4 is a diagram illustrating an example of a method of transmitting a signal by a plurality of RUs according to the first embodiment of the present invention.
FIG. 5 is a diagram illustrating signal processing when a mobile station is located close to an RU in the mobile communication system according to the first embodiment of the present invention.
6 is a diagram illustrating an example in which the mobile communication system according to the first embodiment of the present invention does not transmit data signals from one RU among two RUs.
7 is a diagram illustrating another example in which the mobile communication system according to the first embodiment of the present invention does not transmit a data signal from one RU among two RUs.
8 is a diagram showing an example of signal processing in the case where three cells are adjacent to each other.
9 is a view schematically showing a method of constructing a cell according to a second embodiment of the present invention.
10 is a view schematically showing a cell configuration method according to a third 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 illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters 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.

In this specification, a terminal includes a mobile station (MS), a mobile terminal (MT), a subscriber station (SS), a portable subscriber station (PSS), a user equipment , An access terminal (UE), an access terminal (AT), and the like, and may include all or some functions of a terminal, a mobile terminal, a subscriber station, a mobile subscriber station, a user equipment,

In this specification, a base station (BS) includes an access point (AP), a radio access station (RAS), a node B, an evolved NodeB (eNodeB) A base station (BTS), a mobile multihop relay (MMR) -BS, or the like, and may perform all or a part of functions of an access point, a radio access station, a Node B, an eNodeB, a base transceiver station, .

First, a network structure to which an embodiment of the present invention is applied will be described with reference to FIG.

1 is a schematic configuration diagram of a network according to an embodiment of the present invention.

Referring to FIG. 1, a network according to an embodiment of the present invention includes a radio signal processing unit (RU) 100, a digital signal processing unit (hereinafter referred to as "DU " 200 and a core system 300. The RU 100 and the DU 200 constitute a signal processing system for wireless communication.

The RU 100 converts a digital signal received from the DU 200 as a radio signal processing unit into a radio frequency (RF) signal according to a frequency band and amplifies the digital signal. Then, the signal is transmitted to the terminal through the antenna, and the signal is received from the terminal through the antenna, processed and transmitted to the DU 100.

A plurality of RUs 100, 110, 120, and 130 are connected to the DU 200, and each RU 100 is installed in a service area, that is, a cell. The RU 100 and the DU 200 may be connected by an optical cable.

The DU 200 performs processing such as encryption and decryption of a wireless digital signal and is connected to the core system 300. Unlike the RU 100, the DU 200 is not installed in a service area, but is a server that is mainly installed in a central office of a communication company and is a virtualized base station. The DU 200 transmits and receives signals to and from a plurality of RUs 100.

The existing communication base station includes a processing unit corresponding to each of the RU 100 and the DU 200 in one physical system, and one physical system is installed in the service target area. On the contrary, the system according to the embodiment of the present invention physically separates the RU 100 and the DU 200, and only the RU 100 is installed in the service area.

The core system 300 handles the connection between the DU 200 and the external network, and includes an exchange (not shown) and the like.

2 is a diagram illustrating an example of providing a 4x2 multi-antenna scheme through a plurality of wireless signal processing apparatuses. Here, it is assumed that the wireless signal processing devices 111 and 112 each have two antennas to support the 4 × 2 multi-antenna technology.

Referring to FIG. 2, the radio signal processing devices 111 and 112 included in the cell 1 11 and the cell 2 12 respectively basically transmit a data signal to a terminal close to itself. However, when the terminal 410 is located in the boundary area 20 where both signals can be received from the two radio signal processing apparatuses 111 and 112, the two radio signal processing apparatuses 111 and 112 transmit their respective antennas 1111 and 112 , 1112, 1121, and 1122 to the terminal 410 to support the 4x2 multi-antenna scheme (MIMO). At this time, the antennas 1111, 1112, 1121, and 1122 can transmit RS0, RS1, RS2, and RS3 signals, which are different reference signals, respectively.

The technique of providing the 4x2 multi-antenna scheme through the two radio signal processing apparatuses 111 and 112 is well known to those skilled in the art, so a detailed description thereof will be omitted here.

On the other hand, the position of the reference signal used for each cell varies depending on the Physical Cell IDentification (PCI). That is, a subcarrier using a reference signal is allocated according to a physical cell identifier. Such PCI is well known, so a detailed description thereof will be omitted here.

In this case, the cells 11 and 12 must use the same PCI to support the 4x2 multi-antenna scheme. For example, in FIG. 2, the cells 11 and 12 are all set to use the PCI of 'A'.

3, when a terminal 410 is located close to one RU, for example, the RU 112, a handover is performed in the 4x2 multi-antenna scheme using the above- There is a problem that the terminal 410 can not receive the handover reference signal, i.e., RS0, which is a criterion of judgment. That is, the terminal 410 reports the signal strength of the RS0 to the RUs 111 and 112, and determines whether the handover is performed on the adjacent cell based on the signal. In the situation shown in FIG. 3, There is a problem in over determination.

Hereinafter, a first embodiment of the present invention for solving the above problems will be described.

4 is a diagram showing an example of a method of transmitting signals by a plurality of radio signal processing apparatuses according to the first embodiment of the present invention.

4, the RU 111 located in the cell 1 11 and the RU 112 located in the cell 2 12 have two physical antennas 1111, 1112, 1121 and 1122, respectively, Each antenna transmits two different reference signals (RS). For example, the antenna 1111 of the RU 111 transmits reference signals of RS0 and RS1, and the antenna 1112 transmits reference signals of RS2 and RS3. In FIG. 4, '0' and '1' are indicated on the antenna 1111, which means the port number of the antenna 1111. That is, '0' means port 0, '1' means port 1, means to transmit reference signal R0 at port 0, and transmit reference signal RS1 at port 1. Similarly, since the antenna 1112 transmits the reference signals RS2 and RS3, it has ports 2 and 3, and thus displays '2' and '3'.

On the other hand, the antenna 1121 of the RU 1121 transmits the reference signals of RS0 and RS2, and the antenna 1122 transmits the reference signals of RS1 and RS3.

The transmission principle of the reference signal is to allow each of the RUs 111 and 112 that support the 4x2 multi-antenna scheme to transmit one RS0, and the RUs 111 and 112 transmit the RSOs to the respective antennas 1111, 1112, 1121, and 1122 So that the reference signal of the same pattern is not transmitted.

5, the terminal 410 always receives the RS0 reference signal regardless of where the terminal 410 is, for example, even when the terminal 410 is close to the RU 112. In this case, RS0, RS1, RS2, and RS3 can be received at all times. Therefore, there is no problem that the terminal 410 operates in the 4x2 multi-antenna system.

In the above description, the RUs 111 and 112 each have two antennas. However, the configuration of the above scheme may be applied to three or more antennas.

The arrangement of the reference signals for each antenna as shown in FIGS. 4 and 5 is only one example. The principle of the reference signal, that is, the reference signal RS0 is transmitted in both RUs 111 and 112, Any arrangement can be applied as long as it satisfies the condition that all four reference signals RS0, RS1, RS2, and RS3 are transmitted.

Hereinafter, the arrangement of reference signals as shown in Figs. 4 and 5 will be described.

On the other hand, when two antennas 1111, 1112, and 1122 of one RU 111 or 112 transmit signals of two different reference signals, 1121, and 1122 may transmit data to the terminal 410 using a pattern (precoding, pre-coding) for transmitting the same data signal so that a 180-degree phase is generated. For example, you can use a transmission pattern so that data is 180 degrees out of phase at 0 and 1, and 180 degrees out of phase at 2 and 3.

When such a pattern is used, data signals are not generated in the antennas 1111 and 1112 of the RU 111. [ That is, the antenna 1111 of the RU 111 transmits data signals 0 and 1, and these data signals have a phase of 180 degrees. Further, the antenna 1112 transmits data signals 2 and 3, The data signal does not occur in each of the antennas 1111 and 1112 since the data signal has a phase of 180 degrees.

6, when the RU 111 transmits data to the terminal 430, the data signals are generated in the antennas 1111 and 1112 of the RU 111, And does not interfere with the terminal 420 adjacent to the RU 111.

In the above description, data signals of 0 and 1 data signals are generated 180 degrees, and data signals of 2 and 3 data signals are 180 degrees so as to prevent data signals from being generated from the RU 111. However, Alternatively, the RU 112 may not generate a data signal. That is, when data signals 0 and 2 are 180 degrees out of phase and data signals 1 and 3 are 180 degrees out of phase, a data signal is generated by the antennas 1121 and 1122 of the RU 112 .

7, when the RU 112 transmits data to the terminal 420, the data signals are not generated in the antennas 1121 and 1122 of the RU 112 and are transmitted to the RU 112 Interference with the neighboring terminal 430 is prevented.

As described above, according to the first embodiment of the present invention, data signals transmitted through four antenna ports are mapped by two pairs and data signals having a phase of 180 degrees are allocated to each other, Interference with the terminal can be avoided.

Meanwhile, as described above, the RUs 111 and 112 in the two cells 11 and 12 can implement the 4x2 multi-antenna scheme using two antennas, respectively. This configuration increases the number of cells having the same PCI, It is possible to expand the structure capable of transmitting the multi-antenna scheme. In this case, as shown in FIG. 8, adjacent cells 13 may have the same PCI and transmit the reference signal with the same structure. 8, the RUs 113 of the cells 13 adjacent to the existing cells 11 and 12 are also different from the RUs of the cells 11 and 12 by two antennas 1131 and 1132, To transmit a reference signal. 8, the RU 113 of the cell 13 has the same structure as the RU 111 of the cell 11. In the example of FIG. That is, the RU 113 of the cell 13 transmits the reference signals R0 and R1 while the antenna 1131 transmits the reference signals R2 and R3, as in the RU 111 of the cell 11, . Alternatively, the RU 113 of the cell 13 may transmit a different reference signal, such as the RU 112 of the cell 12.

However, when three or more multi-cell environments are configured as shown in FIG. 8, there is a problem in data demodulation performance of the UE.

For example, referring to FIG. 8, when the RU 111 transmits data to the UE 440, the RU 112 transmits a signal from the RU 112 through specific precoding as described with reference to FIG. You can do it. However, since the RU 113 has a structure for transmitting the same reference signal as the RU 111, when the RU 111 transmits the data signal, the RU 113 also transmits the data signal. That is, since the RUs 111 and 113 have the same structure, it is not possible for any one RU to transmit a signal through specific precoding.

In this case, if the RU 113 transmits a data signal for the terminal 450 without arbitrarily transmitting the data signal for the terminal 440, the reference signal that is a reference for signal demodulation is transmitted to the terminal 440 via the RU 111 and 113. Since the actual data signal is only received in the RU 111, there is a problem in data demodulation in the terminal 440, which lowers the reception performance of the terminal 440.

Hereinafter, a second embodiment of the present invention for solving the above problems will be described.

9 is a view schematically showing a method of constructing a cell according to a second embodiment of the present invention.

Referring to FIG. 9, in order to support 4x2 multi-antenna scheme in a multi-cell environment according to the second embodiment of the present invention, cells are arranged so that the physical antenna ports allocate RUs transmitting the same reference signals as far as possible. In this arrangement, as shown in FIG. 9, a plurality of cells 11, 12, 14, and 15 are arranged in a line in a one-dimensional form.

Of the cells 11, 12, 14 and 15 arranged in a row, the cells 11 and 13 are arranged such that two antenna ports are connected to the reference signal of '0' and '1' and the reference signal of '2' And the cells 12 and 14 are set to transmit the reference signals of '0' and '2' and the reference signals of '1' and '3', respectively. That is, in the first embodiment of the present invention, antenna patterns are alternately allocated to each cell at the time of constructing multiple cells arranged in a line in a one-dimensional form.

At this time, when the RU 111 supports the terminal 410, since there is almost no interference to the terminal 410 even if the RU 114 that transmits the same reference signal to the antenna port supports the other terminal 460, The problem of data demodulation as described above rarely occurs.

This is also the case between the RU 113 and the RU 115.

In addition, the plurality of cells 11, 12, 14, and 15 must have the same PCI.

In the above description, a plurality of cells are arranged in a line in a one-dimensional form, but two-dimensional configurations are possible.

10 is a view schematically showing a cell configuration method according to a third embodiment of the present invention.

Referring to FIG. 10, a plurality of cells 11, 12, 14, 15, 16, 17, 18, and 19 are arranged in a two-dimensional form.

Cells 11, 12, 14, and 15 are arranged in a row in a one-dimensional, transversal fashion, as described with reference to FIG. 9, so that cells are arranged such that the physical antenna ports place the RUs transmitting the same reference signals as far as possible Respectively.

Likewise, cells 16, 17, 18, 19 are also arranged so that physical antenna ports place the RUs that transmit the same reference signals as far as possible while being arranged in a row in a one-dimensional manner in a transverse direction.

By the way, the cells 11, 12, 14, 15 arranged horizontally one-dimensionally and the cells 11, 16 arranged vertically in the cells 16, 17. 18. 19, The cells 14 and 18 and the cells 15 and 19 are arranged so as to transmit the same reference signal to each other, thereby causing a problem of data demodulation. Therefore, in order to avoid this, the cells 11, 12, 14, 15 and the cells 16, 17, 18, 19 have different PCIs in order to use different reference signal patterns. Therefore, even if the reference signals having the same number are transmitted, since the PCIs are different from each other in the cells arranged in different rows, the patterns are different from each other and thus different reference signals are transmitted. Therefore, do.

For example, the RU 111 and the RU 116 have the same antenna configuration, but the RU 111 has a PCI of 'A' and the RU 116 has a PCI of 'B' There is substantially no interference between the data signal transmitted from the RU 111 to the terminal 410 and the data signal transmitted from the RU 116 to the terminal 470. Therefore, there is no data demodulation problem.

As described above, in the first embodiment of the present invention, two different reference signals are combined and applied to the antenna ports of the RUs using the same PCI, so that the 4x2 multi-antenna scheme can be supported regardless of whether the terminal is in a proper state .

Particularly, as in the second embodiment of the present invention, RUs having a structure for transmitting the same reference signal pattern to each other in the same PCI in a multi-cell environment of three or more cells are arranged as far as possible from each other, RUs having the same reference signal transmission pattern are separated from each other, so that there is no problem in data demodulation performance.

In addition, as in the third embodiment of the present invention, different PCIs are used between cells located in each column for two-dimensional cell placement, thereby eliminating the problem of data demodulation performance between cells.

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 digital signal processing device connected to the core system for processing a wireless digital signal; And
And converting the digital signal received from the digital signal processor into a digital signal and transmitting the amplified signal to the terminal based on a multi-antenna technique using two antennas, A plurality of wireless signal processing apparatuses for receiving signals transmitted from a terminal based on a multi-antenna technique using an antenna and transmitting the received signals to the digital signal processing apparatus,
Lt; / RTI >
When two adjacent radio signal processing apparatuses transmit reference signals to a terminal located in a mutual boundary area, two antennas transmit two reference signals of different patterns to each other, And transmits a handover reference signal R0 serving as a reference for determining whether or not
The mobile communication system comprising: The method according to claim 1,
Wherein a pattern of a reference signal transmitted by each antenna is different for each of the two wireless signal processing apparatuses. The method according to claim 1,
Wherein a data signal is allocated so that a data signal is not transmitted from each antenna of one of the two radio signal processing apparatuses. The method of claim 3,
Wherein two kinds of data signals having phases of 180 degrees are allocated to each antenna of the one wireless signal processing apparatus. 5. The method according to any one of claims 1 to 4,
Wherein a cell to which the two radio signal processing apparatuses belongs has the same physical cell identifier for determining a position of a reference signal used for each cell. 5. The method according to any one of claims 1 to 4,
Wherein each of the two radio signal processing apparatuses transmits four different reference signals (R0, R1, R2, R3). A first base station included in each of two adjacent cells, wherein the first base station includes a first antenna and a second antenna, and a second base station, wherein the second base station includes a third antenna and a fourth antenna, / RTI >
Wherein the first antenna, the second antenna, the third antenna, and the fourth antenna each transmit reference signals of two different patterns, and the first antenna, the second antenna, the third antenna, One of the reference signals allocated to the first antenna and the second antenna is a handover reference signal R0 as a reference for determining whether to perform a handover, One of the reference signals allocated to the third antenna and the fourth antenna is the handover reference signal R0
The mobile communication system comprising: 8. The method of claim 7,
The reference signals allocated to the first antenna are R0 and R1,
The reference signals assigned to the second antenna are R2 and R3,
The reference signals allocated to the third antenna are R0 and R2,
The reference signals allocated to the fourth antenna are R1 and R2
The mobile communication system comprising: 9. The method of claim 8,
Wherein a data signal is allocated such that a phase of data signals transmitted through the first antenna is 180 degrees and a phase of data signals transmitted through the second antenna is 180 degrees. . 9. The method of claim 8,
Wherein a data signal is allocated such that a phase of data signals transmitted through the third antenna is 180 degrees and a phase of data signals transmitted through the fourth antenna is 180 degrees. . A digital signal processing device connected to the core system for processing a wireless digital signal; And
And converting the digital signal received from the digital signal processor into a digital signal and transmitting the amplified signal to the terminal based on a multi-antenna technique using two antennas, And a plurality of radio signal processing apparatuses for receiving a signal transmitted from a terminal based on a multi-antenna technique using an antenna and transmitting the received signal to the digital signal processing apparatus,
Wherein a plurality of cells each including the wireless signal processing apparatus are arranged so that a wireless signal processing apparatus for transmitting the same reference signals is arranged far from the wireless signal processing apparatuses for transmitting different reference signals,
Wherein two radio signal processing apparatuses adjacent to each other among the plurality of radio signal processing apparatuses are located in a mutual boundary area and two antennas included in each of the two radio signal processing apparatuses are different from each other And transmits a handover reference signal (R0), which is a reference for determining whether the handover is to be performed, to all of the two radio signal processing apparatuses
The mobile communication system comprising: 12. The method of claim 11,
Wherein the plurality of cells are arranged in a line. 13. The method of claim 12,
Wherein two types of reference signal patterns are alternately assigned to each of a plurality of cells arranged in a line and each of the plurality of cells includes a reference signal pattern assigned to a cell to which the radio signal processing apparatus belongs And transmits a reference signal according to the received signal. 14. The method according to any one of claims 11 to 13,
Wherein the physical cell identifiers of the plurality of cells arranged in a row are the same. A digital signal processing device connected to the core system for processing a wireless digital signal; And
And converting the digital signal received from the digital signal processor into a digital signal and transmitting the amplified signal to the terminal based on a multi-antenna technique using two antennas, And a plurality of radio signal processing apparatuses for receiving a signal transmitted from a terminal based on a multi-antenna technique using an antenna and transmitting the received signal to the digital signal processing apparatus,
A plurality of cells each including the radio signal processing device are arranged in a two-dimensional form,
Wherein two radio signal processing apparatuses adjacent to each other for radio signal processing apparatuses included in cells arranged on the same row among the plurality of cells transmit radio signals to the terminals located in the mutual boundary region, The two antennas included in each of the signal processing apparatuses transmit the reference signals of two patterns different from each other to the terminal, and all of the two radio signal processing apparatuses transmit the handover reference signal R0 )
The mobile communication system comprising: 16. The method of claim 15,
Wherein two types of reference signal patterns are alternately allocated to a plurality of cells arranged in the same row on a cell-by-cell basis, and a radio signal processor included in each of the plurality of cells is allocated with a reference signal pattern And transmits the reference signal. 17. The method according to claim 15 or 16,
Wherein the physical cell identifiers of the plurality of cells arranged in the same row are the same but have physical cell identifiers different from one another in each row.

Images