KR101295897B1 - Apparatus for processing digital signal and system for processing signal comprising the same - Google Patents

Apparatus for processing digital signal and system for processing signal comprising the same Download PDF

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Publication number
KR101295897B1
KR101295897B1 KR1020120048811A KR20120048811A KR101295897B1 KR 101295897 B1 KR101295897 B1 KR 101295897B1 KR 1020120048811 A KR1020120048811 A KR 1020120048811A KR 20120048811 A KR20120048811 A KR 20120048811A KR 101295897 B1 KR101295897 B1 KR 101295897B1
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KR
South Korea
Prior art keywords
signal processing
terminal
processing apparatuses
wireless
digital signal
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KR1020120048811A
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Korean (ko)
Inventor
이기호
이용규
지영하
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주식회사 케이티
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Priority to KR1020120048811A priority Critical patent/KR101295897B1/en
Priority to PCT/KR2012/009199 priority patent/WO2013168863A1/en
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Publication of KR101295897B1 publication Critical patent/KR101295897B1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0618—Space-time coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • H04W88/085—Access point devices with remote components

Abstract

Disclosed are a digital signal processing apparatus and a signal processing system including the apparatus.
The system includes a digital signal processing device coupled to the core system for processing wireless digital signals. In addition, it is physically separated from the digital signal processing device, converts and amplifies the digital signal received from the digital signal processing device and transmits it to the terminal, and receives the signal transmitted from the terminal and delivers it to the digital signal processing device. It includes a plurality of radio signal processing apparatus. In this case, the digital signal processing apparatus may perform simultaneous transmission by the terminal based on signal strength values transmitted from two wireless signal processing apparatuses among the plurality of wireless signal processing apparatuses and transmission power of each of the two wireless signal processing apparatuses. If it is determined to be located in the area to be performed, the two wireless signal processing apparatuses perform a simultaneous transmission function of transmitting a signal, which is coded in time and space, for the same signal or one data to the terminal.

Description

Digital signal processing device and signal processing system including the device {APPARATUS FOR PROCESSING DIGITAL SIGNAL AND SYSTEM FOR PROCESSING SIGNAL COMPRISING THE SAME}

The present invention relates to a digital signal processing apparatus and a signal processing method including the apparatus.

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, there is a need for a new structure and transmission method of a base station to maximize wireless capacity.

In particular, in the related art, in order to improve transmission efficiency to a terminal between cells, a joint processing function of transmitting a signal that is appropriately space-time coded for the same signal or one data is used by the base stations of both cells. There is a problem that the simultaneous transmission function is not optimized because this other case is not considered.

The technical problem to be achieved by the present invention is to provide a digital signal processing device and a signal processing method including the device that can maximize the diversity effect to maximize the performance in the boundary area, and provides the optimal simultaneous transmission function .

Signal processing system according to an aspect of the present invention,

A digital signal processing device connected to the core system for processing a wireless digital signal; And physically separated from the digital signal processing apparatus, converts and amplifies a digital signal received from the digital signal processing apparatus, and transmits the digital signal to the terminal, and receives and transmits the signal transmitted from the terminal to the digital signal processing apparatus. And a plurality of wireless signal processing apparatuses, wherein the digital signal processing apparatus is based on signal strength values transmitted from two wireless signal processing apparatuses of the plurality of wireless signal processing apparatuses and transmission power of each of the two wireless signal processing apparatuses. When it is determined that the terminal is located in an area performing the simultaneous transmission function, the two wireless signal processing apparatuses perform the simultaneous transmission function of transmitting the same signal or a time-coded signal with respect to the terminal to the terminal. Characterized in that.

Here, the two radio signal processing apparatuses transmit a signal to the terminal using the same channel.

In addition, the digital signal processing apparatus determines a region to perform the simultaneous transmission function according to the difference in the transmission power of each of the two wireless signal processing apparatuses, and performs the simultaneous transmission function toward the wireless signal processing apparatus having a small transmission power. It is characterized by determining that the area to be biased.

Further, the digital signal processing apparatus may be configured as follows: B- (X-Y) -A | ≤ T, where X and Y represent a case where X is larger as the transmission power of each of the two radio signal processing apparatuses, and A and B are signal strength values received from each of the two radio signal processing apparatuses. Is a signal strength value received by the wireless signal processing device having a transmission power of X, B is a signal strength value received by the wireless signal processing device having a transmission power of Y, and T is an integer of 0 or more. It is characterized in that it is determined to be located in the area performing the function.

Digital signal processing apparatus according to another aspect of the present invention,

A digital signal processing apparatus physically separated from a plurality of radio signal processing apparatuses installed in a service area for processing radio signals and processing radio signals from the plurality of radio signal processing apparatuses, A receiving unit for receiving the uplink signal strength value received from the two wireless signal processing apparatuses from the two of the two wireless signal processing apparatuses; A simultaneous transmission function between the two radio signal processing apparatuses by the terminal based on a signal strength value received through the receiver and transmission power of each of the two radio signal processing apparatuses, wherein the simultaneous transmission function is the two radio signals; A determination unit for determining whether the processing device is located in an area for performing the same signal or a signal coded in one space or time with respect to one terminal; And when the terminal determines that the terminal is located in a region performing the simultaneous transmission function between the two wireless signal processing apparatuses, the two wireless signal processing apparatuses simultaneously transmit the same to the terminal. It includes a processor for controlling the two wireless signal processing apparatus to perform a function.

The determination unit may determine whether the terminal is located in an area for performing the simultaneous transmission function according to a difference in transmission power of each of the two radio signal processing apparatuses.

The determination unit may compare the difference between the transmission powers of the two radio signal processing apparatuses with the difference between the signal intensity values received by the two radio signal processing apparatuses from the terminal, and if the difference is less than or equal to the threshold value. Characterized in that it is determined that the terminal is located in the area performing the simultaneous transmission function.

In addition, the region performing the simultaneous transmission function may be formed by shifting transmission power toward the smaller side of the two wireless signal processing apparatuses.

According to the present invention, a data transmission efficiency for a terminal can be increased through a simultaneous transmission function in a plurality of cells.

In addition, even when the transmission power transmitted by the plurality of cells is different, it is possible to efficiently transmit data by providing an optimized simultaneous transmission function, thereby improving network capacity.

1 is a schematic diagram of a network to which the present invention is applied.
2 is a schematic configuration diagram of a cell to which the present invention is applied.
FIG. 3 is a diagram illustrating an example of a signal transmitted by a plurality of wireless signal processing apparatuses included in a cell shown in FIG. 2.
4 is a diagram illustrating an example of a signal transmitted by a plurality of wireless signal processing apparatus according to an embodiment of the present invention.
FIG. 5 is a diagram illustrating an example of acquiring information for determining whether a location is located in an area in which a simultaneous transmission function of a terminal is performed according to an embodiment of the present invention.
6 is a block diagram of a digital signal processing apparatus according to an embodiment of 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. 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 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, without excluding other components 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, .

A signal processing system according to an embodiment of the present invention will now be described in detail with reference to the drawings.

1 is a schematic diagram of a network to which the present invention is applied.

Referring to FIG. 1, a network to which the present invention is applied includes a radio signal processing unit (RU) 100, a digital signal processing unit (DU) 200, and a core system 300. The wireless signal processing apparatus 100 and the digital signal processing apparatus 200 constitute a signal processing system of wireless communication.

The wireless signal processing apparatus 100 converts and amplifies a digital signal received from the digital signal processing apparatus 200 into a radio frequency (RF) signal according to a frequency band as a part of processing a wireless signal. A plurality of wireless signal processing apparatuses 100, 110, 120 and 130 are connected to the digital signal processing apparatus 200, and each wireless signal processing apparatus 100 is installed in a service area, that is, a cell. The wireless signal processing apparatus 100 and the digital signal processing apparatus 200 may be connected by an optical cable.

The digital signal processing apparatus 200 performs a process of encrypting and decrypting a wireless digital signal, and is connected to the core system 300. Unlike the wireless signal processing apparatus 100, the digital signal processing apparatus 200 is not installed in a service area but is mainly installed in a central office of a communication company, and is a virtualized base station. The digital signal processing apparatus 200 transmits and receives signals to and from a plurality of radio signal processing apparatuses 100.

The existing communication base station includes a processing unit corresponding to each of the wireless signal processing apparatus 100 and the digital signal processing apparatus 200 in one physical system, and one physical system is installed in the service target area. On the other hand, the system according to the present invention physically separates the wireless signal processing device 100 and the digital signal processing device 200, and only the wireless signal processing device 100 is installed in the service area.

The core system 300 processes connection between the digital signal processing apparatus 200 and the external network, and includes an exchange (not shown) and the like.

Referring now to Figure 2 will be described in detail with respect to the cell structure to which the present invention is applied.

2 is a schematic configuration diagram of a cell to which the present invention is applied.

Referring to FIG. 2, the cells 10, 20, and 30 to which the present invention is applied each include a plurality of wireless signal processing apparatuses 100. The radio signal processing apparatus 100 includes macro radio signal processing apparatuses (macro RUs) 111 and 121 (macro RUs) and a plurality of cooperative RUs 112, 113, 114, 115, 116, and 117. , 122, 123, 124, 125, 126, and 127.

The macro radio signal processing apparatuses 111 and 121 manage main communication processing of the cells 10 and 20, and transmit signals to all terminals in the cells 10 and 20 with high power. The cooperative radio signal processing apparatuses 112-117 and 122-127 transmit a signal to a terminal in the vicinity of the terminal with a smaller output power than that of the macro radio signal processing apparatuses 111 and 121.

One cell 10 includes at least one macro radio signal processing device 111 and a plurality of cooperative radio signal processing devices 112-117. All of the wireless signal processing apparatuses 100 included in the plurality of cells 10, 20, and 30 are controlled by the digital signal processing apparatus 200.

On the other hand, the wireless signal transmitted by the wireless signal processing device 100 to the terminal is a control signal (control signal) that informs the basic system information and data channel assignment information (data signal) for transmitting user data (data signal) and channel estimation, etc. It includes a reference signal for (reference signal).

The plurality of cooperative radio signal processing apparatuses 112-117 included in one cell 10 transmit the same control signal and reference signal as the macro radio signal processing apparatus 111 included in the same cell 10.

In addition, the wireless signal processing apparatus 100 included in different cells 10, 20, and 30 transmits different control signals and reference signals. For example, the reference signal transmitted by the radio signal processing apparatuses 111-117 included in the cell 10 and the reference signal transmitted by the radio signal processing apparatuses 121-127 included in the cell 20 are different from each other. .

In this way, by providing the plurality of cooperative radio signal processing apparatuses 112-117 as well as the macro radio signal processing apparatuses 111 and 121 in one cell, the terminal can efficiently control the control signals and the reference signals that are commonly transmitted in the cell. Can be received.

FIG. 3 is a diagram illustrating an example of a signal transmitted by a plurality of wireless signal processing apparatuses included in a cell shown in FIG. 2.

Referring to FIG. 3, the wireless signal processing apparatuses 111 and 112 included in the cell 1 11 and the cell 2 12, respectively, use a simultaneous processing function to the terminal 410 located in a cell boundary region. Therefore, the transmission efficiency is increased by transmitting a signal coded in space-time with respect to the same signal or one data.

In this case, signal quality can be doubled (3dB) or space-time channel coding gain can be obtained.

4 is a diagram illustrating an example of a signal transmitted by a plurality of wireless signal processing apparatus according to an embodiment of the present invention.

Referring to FIG. 4, the wireless signal processing apparatuses 121 and 122 included in the cell 3 21 and the cell 4 22 respectively transmit signals at different transmission powers. In particular, the radio signal processing apparatus 121 in the cell 3 21 transmits a signal with a transmission power much larger than that of the radio signal processing apparatus 122 in the cell 4 22. In this case, unlike in the case of FIG. 3, the area for performing the simultaneous transmission function is different.

That is, since the transmission power of the radio signal processing apparatuses 121 and 122 in the cell 3 (21) is greater, the coverage of the cell 3 (21) is greater than that of the cell 4 (22), so that the boundary between the cells is biased toward the cell 4 (22). do. Therefore, the area performing the simultaneous transmission function between the cell 3 (21) and the cell 4 (22) is also biased toward the cell 4 (22).

More specifically, in FIG. 4, the terminal 420 located in the region (a) is located in the middle region of the cell 3 (21) and the cell 4 (22), but is located inside the coverage of the cell 3 (21) and is located in the intercell boundary region. Do not perform simultaneous transmission functions. However, since the terminal 430 located in the region (b) is located in an area biased toward the cell 4 (22), the terminal 430 is located in the boundary area between the cell 3 (21) and the cell 4 (22). Perform the winter transcript function.

Now, a method for applying an embodiment of the present invention according to the position of the terminal will be described.

Referring to FIG. 5, first, it is assumed that the base station transmit power of the wireless signal processing device 131 is X, and that the base station transmit power of the wireless signal processing device 132 is Y, and the digital transmission power X and Y are digital. It is assumed that the signal processing apparatus 200 knows in advance.

Each of the two wireless signal processing apparatuses 131 and 132 measures the signal strength of the uplink received from the terminal 440 and transmits the signal strength to the digital signal processing apparatus 200. The digital signal processing apparatus 200 may then receive a signal strength value A received from the wireless signal processing device 131, a signal strength value B received from the wireless signal processing device 122, and two wireless signal processing devices ( On the basis of the transmission powers X and Y of the 131 and 132, it is determined whether or not the position in the area where the simultaneous transmission function of the terminal should be performed.

That is, when the absolute value of the value obtained by subtracting the difference between the transmission powers X and Y from the difference between the signal strength value B and the signal strength value A is equal to or less than the threshold value T as shown in Equation 1, the terminal simultaneously transmits a function. It is determined that it is located in the area to be executed.

[Equation 1]

| B- (X-Y) -A | ≤ T (in dB), where T is an integer greater than or equal to 0

As can be seen from Equation 1, if the transmission powers of the two wireless signal processing apparatuses 131 and 132 are the same or the difference is very small, the transmission power X of the two wireless signal processing apparatuses 131 and 132 is XY ≒ 0. For example, the difference between Y and T is less than or equal to T. Therefore, the boundary region is located in the center region between the two cells, and this region becomes a region for performing simultaneous transmission function. This corresponds to the case of FIG. 3 described above.

However, when the transmission powers of the two wireless signal processing apparatuses 131 and 132 are different and the difference is so large that XY or YX has a large value, the signal strength values A received from the two wireless signal processing apparatuses 131 and 132 are large. Since the difference between the difference of B and the difference between the transmission powers X and Y should be less than or equal to T, the boundary area is located in an area biased by either cell between the two cells, and the area is capable of simultaneous transmission. It becomes the area to perform. This corresponds to the case of FIG. 4 described above.

Referring now to Figure 6 will be described in detail with respect to the digital signal processing apparatus 200 according to an embodiment of the present invention.

6 is a block diagram of a digital signal processing apparatus 200 according to an embodiment of the present invention.

Referring to FIG. 6, the digital signal processing apparatus 200 includes a receiver 210, a determiner 220, and a processor 230.

The receiver 210 receives a radio signal from the radio signal processing apparatuses 131 and 132. The radio signal includes an uplink signal strength value received by the radio signal processing apparatuses 131 and 132 from the terminal.

The determination unit 220 performs an operation as shown in Equation 1 based on the signal strength value received by the receiving unit 210 and the transmission power of the wireless signal processing apparatuses 131 and 132 to perform a simultaneous transmission function. Determine if you are in an area.

The processor 230 performs a process for controlling data transmission of the wireless signal processing apparatuses 131 and 132 according to the determination of the determination unit 220. In particular, according to an embodiment of the present invention, when the terminal is located in an area that performs the simultaneous transmission function of the wireless signal processing device (131, 132), the wireless signal processing device (131, 132) with respect to the terminal 440 Control to perform simultaneous transmission function. 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 (8)

A digital signal processing device connected to the core system for processing a wireless digital signal; And
Physically separated from the digital signal processing apparatus, the digital signal received from the digital signal processing apparatus converts and amplifies and transmits the signal to the terminal, and receives the signal transmitted from the terminal and transmits the signal to the digital signal processing apparatus. A wireless signal processing device,
The digital signal processing apparatus may perform simultaneous transmission by the terminal based on signal strength values transmitted from two wireless signal processing apparatuses among the plurality of wireless signal processing apparatuses and transmission power of each of the two wireless signal processing apparatuses. If it is determined to be located in the area, the two wireless signal processing apparatus performs a simultaneous transmission function for transmitting the same signal or a time-code coded signal to the terminal to the terminal,
The digital signal processing apparatus determines an area for performing the simultaneous transmission function according to a difference in transmission power of each of the two wireless signal processing devices, and performs the simultaneous transmission function toward a wireless signal processing device having a small transmission power. To decide to bias
Signal processing system, characterized in that. The method of claim 1,
The two radio signal processing apparatuses transmit a signal to the terminal using the same channel. delete The method of claim 1,
The digital signal processing apparatus has the following relational expression
| B- (XY) -A | ≤ T
Here, X and Y represent a case where X is larger as the transmission power of each of the two radio signal processing apparatuses.
A and B are signal strength values received from each of the two wireless signal processing apparatuses.
A is a signal strength value received by the wireless signal processing device having a transmit power of X,
B is a signal strength value received from a wireless signal processing device having a transmit power of Y,
T is an integer greater than or equal to 0
And determining that the terminal is located in an area for performing the simultaneous transmission function. A digital signal processing device which is physically separated from a plurality of radio signal processing devices installed in a service area and processes radio signals, and which processes radio signals from the plurality of radio signal processing devices,
A receiver configured to receive an uplink signal strength value received by the two wireless signal processing apparatuses from a terminal from two wireless signal processing apparatuses among the plurality of wireless signal processing apparatuses;
A simultaneous transmission function between the two radio signal processing apparatuses by the terminal based on a signal strength value received through the receiver and transmission power of each of the two radio signal processing apparatuses, wherein the simultaneous transmission function is the two radio signals; A determination unit for determining whether the processing device is located in an area for performing the same signal or a signal coded in one space or time with respect to one terminal; And
If it is determined by the determination unit that the terminal is located in an area performing the simultaneous transmission function between the two radio signal processing apparatuses, the two radio signal processing apparatuses simultaneously transmit the function to the terminal. A processing unit for controlling the two wireless signal processing apparatuses to perform
The determination unit determines whether the terminal is located in the region performing the simultaneous transmission function according to the difference in the transmission power of each of the two wireless signal processing apparatus,
The region performing the simultaneous transmission function is formed by shifting the transmission power of the two radio signal processing apparatuses toward the smaller side.
Digital signal processing apparatus, characterized in that. delete The method of claim 5,
The determination unit compares the difference between the transmission powers of the two radio signal processing apparatuses with the difference between the signal strength values received by the two radio signal processing apparatuses from the terminal, and if the difference is less than or equal to a threshold value, And determining that it is located in an area that performs the simultaneous transmission function. delete
KR1020120048811A 2012-05-08 2012-05-08 Apparatus for processing digital signal and system for processing signal comprising the same KR101295897B1 (en)

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PCT/KR2012/009199 WO2013168863A1 (en) 2012-05-08 2012-11-02 Digital signal processing device and signal processing system including same

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100157901A1 (en) * 2007-06-18 2010-06-24 Sanderovitz Amichay Wireless network architecture and method for base station utilization

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KR101355501B1 (en) * 2009-01-27 2014-01-28 에이디씨 텔레커뮤니케이션스 인코포레이티드 Method and apparatus for digitally equalizing a signal in a distributed antenna system
RU2556081C1 (en) * 2011-05-17 2015-07-10 Хуавэй Текнолоджиз Ко., Лтд. Communication system and method of its control

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100157901A1 (en) * 2007-06-18 2010-06-24 Sanderovitz Amichay Wireless network architecture and method for base station utilization

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