KR102012246B1 - Radio base station and method for processing data thereof - Google Patents

Radio base station and method for processing data thereof Download PDF

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KR102012246B1
KR102012246B1 KR1020120085899A KR20120085899A KR102012246B1 KR 102012246 B1 KR102012246 B1 KR 102012246B1 KR 1020120085899 A KR1020120085899 A KR 1020120085899A KR 20120085899 A KR20120085899 A KR 20120085899A KR 102012246 B1 KR102012246 B1 KR 102012246B1
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South Korea
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data
rru
decision value
base station
decoding
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KR1020120085899A
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Korean (ko)
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KR20130051873A (en
Inventor
이훈
방승재
손경열
박윤옥
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한국전자통신연구원
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    • 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
    • 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
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/06—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection
    • H04L25/061—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection providing hard decisions only; arrangements for tracking or suppressing unwanted low frequency components, e.g. removal of dc offset
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/06—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection
    • H04L25/067—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection providing soft decisions, i.e. decisions together with an estimate of reliability

Abstract

The group wireless base station includes a group digital processing unit including a plurality of digital signal processing units (DUs), and a plurality of remote radio frequency units connected to the group digital processing unit through a transmission network and installed in each service area. Radio Frequency Unit (RRU). In this case, each DU includes a decoder for decoding uplink data received from each DU, and each RRU includes an encoder for encoding downlink data from each DU.

Figure R1020120085899

Description

Radio base station and its data processing method {RADIO BASE STATION AND METHOD FOR PROCESSING DATA THEREOF}

The present invention relates to a wireless base station and a data processing method thereof, and more particularly, to a wireless base station and a data processing method thereof in which a digital signal processing unit and a plurality of remote wireless signal processing units are connected to a transmission network.

Due to the popularization of smartphones, network speed has been added as an important competitive edge. To this end, Cloud Communication Center (CCC) was introduced.

The CCC separates the digital unit (DU) and the remote radio unit (RRU) from the existing radio base station together in one unit to centralize the DUs in separate DU centers, and the RRU It is a technology to install and connect with optical cable. Such a clustered wireless base station can reduce the lease cost and power cost by making maintenance and repair easy and minimizing the installation area of the wireless base station.

However, in the clustered radio base station, since the RRU and the DU are connected through a transport network, a lot of data transmission is required in the transport network. That is, since the modulation, demodulation, code, and decoding, which are physical layer functions of the baseband modem, are performed in the DU, the amount of data exchanged between the DU and the RRU is increased.

The technical problem to be solved by the present invention is to provide a wireless base station and its data processing method that can reduce the amount of data transmitted and received through the transmission network between the RRU and DU.

According to one embodiment of the present invention, a clustered wireless base station is provided. The wireless base station is a group digital processing unit including a plurality of digital signal processing units (DUs), and a plurality of remote radio frequency units connected to the group digital processing unit through a transmission network and installed in each service target area. Unit, an RRU), and each DU may include a MAC function for performing transmission and reception of a medium access control (MAC) function, and each RRU may include an encoder for encoding downlink data from each DU.

Each DU may further include a decoder for decoding uplink data received through the antenna.

Each RRU may further include a decoder for decoding uplink data received through the antenna.

The RRU calculates a soft decision value or a hard decision value of a modulator for modulating the encoded data, an RF unit for converting the modulated data and then transmitting the modulated data to an RF signal, and uplink data received through an antenna. The apparatus may further include a demodulator for transmitting to the group digital processor.

According to another embodiment of the present invention, a group digital processing unit including a digital unit (DU) of each base station, and a plurality of groups connected to the group digital processing unit through a transmission network and installed in each service target area A method of processing downlink data in a clustered radio base station including a remote radio frequency unit (RRU) is provided. The data processing method of the wireless base station transmits, by the group digital processing unit, downlink data received from an upper layer to at least one RRU of the plurality of RRUs through the transport network, wherein the at least one RRU encodes the downlink data. Modulating, and converting the data encoded and modulated by the at least one RRU into an RF signal and transmitting the RF signal through an antenna.

According to another embodiment of the present invention, a group digital processing unit including a digital unit (DU) of each base station, and a plurality of groups connected to the group digital processing unit through a transmission network and installed in each service target area Provided is a method of processing uplink data in a clustered wireless base station including a Remote Radio Frequency Unit (RRU). A data processing method of a wireless base station includes at least one RRU of the plurality of RRUs receiving uplink data through an antenna, the at least one RRU calculating a soft decision value or hard decision value of the uplink data, and Decoding the uplink data using the soft decision value or the hard decision value in the at least one RRU or the corresponding DU.

The decoding may include transmitting, by the at least one RRU, the soft decision value or the hard decision value to the corresponding DU through the transport network, and the DU using the soft decision value or the hard decision value. And decoding the uplink data.

The decoding may include decoding, by the at least one RRU, the uplink data using the soft decision value or the hard decision value, and transmitting the decoded data to the corresponding DU through the transport network. Can be.

According to another embodiment of the present invention, a clustered wireless base station is provided. The wireless base station is connected to a plurality of digital unit (DU) through a transmission network, an encoder for encoding downlink data from each DU, a modulator for modulating the encoded data, the modulated data an RF signal And a RF unit for converting and transmitting a soft decision value or hard decision value of uplink data received through the antenna, and a demodulation unit for calculating and transmitting the soft decision value or hard decision value to at least one of the plurality of DUs.

According to an embodiment of the present invention, in the implementation of a clustered wireless base station, by performing a physical layer function of a baseband modem in an RRU installed at a remote location, it is possible to reduce the amount of data transmitted and received through the transmission network between the RRU and the DU.

1 is a diagram illustrating a clustered wireless base station according to an embodiment of the present invention.
2 and 3 are diagrams showing the detailed configuration of the wireless base station shown in FIG.
4 is a diagram illustrating an example of a downlink data processing method of a wireless base station according to an embodiment of the present invention.
5 is a diagram illustrating an example of an uplink data processing method of a wireless base station according to an embodiment of the present invention.

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

Throughout the specification and claims, 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.

Now, a wireless base station and a data processing method thereof according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating a wireless base station according to an embodiment of the present invention.

Referring to FIG. 1, a wireless base station includes a group digital processing unit 100 and a plurality of remote radio frequency units (RRUs) 210 and 220 connected to a group digital processing unit 100 through a transmission network. .

The group digital processing unit 100 is installed in the digital center. The group digital processing unit 110 includes a plurality of digital signal processing units (DUs), for example, DUs 110 and 120 and a switching unit 130.

That is, by concentrating the DUs 110 and 120 of several base stations in one group digital processing unit 100, several base stations can be used as one wireless base station.

The DUs 110 and 120 perform digital signal processing and medium access control (MAC) functions.

The switching unit 130 switches up and down data transmitted and received between the group digital processing unit 100 and the RRUs 210 and 220.

The RRUs 210 and 220 are installed in respective service target areas and are connected to the group digital processing unit 100 through a transmission network such as coaxial cable, optical cable, and microwave.

In general, the RRUs 210 and 220 perform only an RF function of amplifying an RF signal and transmitting the amplified RF signal through an antenna.

In contrast, the RRUs 210 and 220 according to an embodiment of the present invention perform the physical layer functions of the baseband modem such as modulation, demodulation, code, and decoding as well as the RF function. In this case, the decoding function of the physical layer functions of the baseband modem may be performed by the DUs 110 and 120.

The wireless base station can be easily maintained and repaired, and the installation area of the wireless base station can be minimized to reduce the lease cost and the power cost, and the RRU 210, 220 performs the physical layer function of the baseband modem. The amount of data exchanged through the transport network between the 210 and 220 and the DUs 110 and 120 may be reduced.

2 and 3 are diagrams showing the detailed configuration of the wireless base station shown in FIG.

Referring to FIG. 2, the DUs 110 and 120 of the group digital processing unit 100 according to an embodiment of the present invention include the MAC function units 112 and 122 and the decoders 114 and 124, respectively. The MAC function units 112 and 122 perform the transmit / receive MAC function of the base station.

The decoders 114 and 124 decode the uplink data by using a soft decision or hard decision value of the uplink demodulation data received from the RRUs 210 and 220. To pass. At this time, a representative soft decision method is a method using a log likelihood ratio (LLR) value.

In particular, the decoders 114 and 124 may decode the soft decision value or hard decision value of upstream data received from different RRUs 210 and 220 according to a reception operation method, and transmit the decoded soft decision value or hard decision value to the MAC function 112 and 122, respectively. have. Alternatively, the decoders 114 and 124 may combine and decode soft decision values or hard decision values of upstream data received from different RRUs 210 and 220, and then pass them to the MAC function units 112 and 122.

The RRUs 210 and 220 include encoders 212 and 222, modulators 214 and 224, demodulators 216 and 226 and RF units 218 and 228, respectively. Although not shown in FIG. 1, the RRUs 210 and 220 may further include a module (not shown) that performs a function of encryption and restoration, which is a physical layer function of the baseband modem. Also, the RRUs 210 and 220 are digital-to-analog converters of baseband modems (shown between modulators 214 and 224 and RF units 218 and 228 and between RF units 218 and 228 and demodulators). Not shown) and an analog-digital converter (not shown).

The encoders 212 and 222 encode downlink data output from the MAC function units 112 and 122 of the group digital processing unit 100 and output the encoded downlink data to the modulators 214 and 224.

The modulators 214 and 224 modulate the encoded data according to a predetermined modulation scheme, and output the modulated data to the RF units 218 and 228. The RF units 218 and 228 convert and amplify the modulated data into RF signals to antennas. Send through.

In addition, the RF unit 218, 228 transmits the uplink data received through the antenna to the demodulator 216, 226, the demodulator 216, 226 demodulates the uplink data and then transmits to the group digital processing unit 100 do. In this case, the demodulators 216 and 226 calculate a soft decision or hard decision value of the upstream data, and transfer the calculated value to the group digital processing unit 100.

Meanwhile, referring to FIG. 3, unlike the FIG. 2, the DUs 110 ′ and 120 ′ of the wireless base station according to another embodiment of the present invention include only the MAC functional units 112 and 114 according to an operation method, and the RRU 210. ', 220' may further include decoders 219 and 229. In this case, the decoders 219 and 229 decode the upstream data by using the determination value of the upstream data received from the demodulators 218 and 228 and transmit the decoded upstream data to the MAC functions 112 and 122. As such, as the encoders 212 and 222 are located in the RRUs 210 and 220, the modulated data does not pass through the transmission network, and the decoders 114 and 124 are positioned in the DUs 110 and 120 according to the operating method. Decision values are input to the decoders 114 and 124 through the transport network, or the decoders 219 and 229 are located at the RRUs 210 'and 220' and the decoded values are transmitted to the MAC functions 112 and 114 through the transport network. By input, it is possible to significantly reduce the amount of data exchanged between the RRU (210, 220) and DU (110, 120) compared to the conventional clustered wireless base station.

For example, when the downlink data transmission is performed, the data input from the MAC function units 112 and 122 to the encoders 212 and 222 is doubled through the encoders 212 and 222 (when the coding rate is 0.5). 2 times), the data necessary for constructing the radio transmission frame is added (preamble, pilot signal, etc.), and the process of expressing one bit of data in detail to the precision of the digital-to-analog converter in the signal processing process (14-bit digital-to-analog converter If taken into account, 14 bits are used to transfer 1-bit data).

Therefore, when the physical layer function of the baseband modem is performed by the RRUs 210 and 220, the amount of data transmitted through the transport network may be reduced than the physical layer function of the baseband modem is performed by the DUs 1110 and 120. Of course, by using a modulation scheme such as 64-QAM in the modulation process, it is possible to reduce the total amount of transmitted data to some extent.

4G mobile communication technologies WiBro-Adv. And LTE-Adv. Table 1 shows the difference between the amount of data transmitted to the RRU of the existing base station and the amount of data transmitted to the RRU according to the embodiment of the present invention through the transmission network based on the specification.

Specification WiBro-Adv. LTE-Adv. Duplexing TDD FDD Bandwidth (DL / UL, MHz) 20 20/20 FFT Size 2048 2048 CP Size 256 144 Samples / OFDMA Symbol 2304 2192 ADC / DAC Resolution (bits) 14 14 MIMO (DL / UL) 4x4 4x4 / 1x4 Frame Duration (ms) 20 10 OFDMA symbols / Frame 188 140 Max. Data Rate (DL / UL, Mbps / Sector) 150/50 326/86 Sectors / Base Station 3 3 Transport network data volume Existing RRH Base Station 7.2 Gbps 13 Gbps Base station according to the present invention 0.6 Gbps 1.24 Gbps

Looking at Table 1, it can be seen that the amount of transmission network transmission data is significantly reduced compared to the conventional.

4 is a diagram illustrating an example of a downlink data processing method of a wireless base station according to an embodiment of the present invention.

Referring to FIG. 4, the MAC function units 112 and 122 of each base station transmit downlink data DL1 and DL2 received from an upper layer to the switching unit 130 (S402 and S404).

When the switching unit 130 receives the downlink data DL1 and DL2 from the MAC function units 112 and 122, the switching unit 130 switches the downlink data DL1 and DL2 to the corresponding RRUs 210 and 220, respectively (S406 and S408). ).

When the encoders 212 and 222 of the RRUs 210 and 220 receive the downlink data DL1 and DL2, respectively, the downlink data DL1 and DL2 are encoded and output to the modulators 214 and 224 (S410 and S412). ).

The modulators 214 and 224 modulate the encoded data in a predetermined modulation scheme (S414 and S416), and the RF units 218 and 228 convert and amplify the modulated data into an RF signal and transmit the modulated data through the antenna (S418). , S420).

Next, a data processing method of the wireless base station will be described based on the wireless base station of FIG. 2 with reference to FIGS. 4 and 5.

5 is a diagram illustrating an example of an uplink data processing method of a wireless base station according to an embodiment of the present invention.

Referring to FIG. 5, when the RF units 218 and 228 of the RRUs 210 and 220 respectively receive the uplink data UL1 and UL2 from the antenna (S502 and S504), the received uplink data UL1 and UL2 are received. The data is transmitted to the demodulators 216 and 226 (S506 and S508). At this time, of course, the uplink data received from the antenna is converted into a baseband signal, and then converted into a digital signal through analog-to-digital conversion and transmitted to the demodulators 216 and 226.

The demodulators 216 and 226 calculate hard decision values or soft decision values DV1 and DV2 of upstream data converted into digital signals, and switch the calculated decision values DV1 and DV2 through a transmission network. S510 and S512. The switching unit 130 transmits the determination values DV1 and DV2 of the received upstream data to the corresponding decoders 114 and 124 (S514 and S516).

The decoders 114 and 124 decode the upstream data using the determination values DV1 and DV2 of the upstream data, and transmit the decoded data UL1 and UL2 to the MAC functional units 112 and 122 (S518 and S520). ). In this case, the determination values DV1 and DV2 of the upstream data may be transferred to one decoder, for example, the decoder 114. In this case, when the determination values DV1 and DV2 are soft decision values, the decoders 114 may respectively transmit the determination values DV1 and DV2. Decoding may be performed after combining decision values DV1 and DV2 from other RRUs 210 and 220. That is, only when the soft decision value is used, the soft decision value transmitted from two or more RRUs 210 and 220 may be summed and decrypted.

Meanwhile, in the case of the wireless base station as shown in FIG. 3, the decoders 114 and 124 combine and decode soft decision values or hard decision values of upstream data received from different RRUs 210 and 220 and then perform MAC functions through a transmission network. It may be delivered to parts 112 and 122.

The MAC functions 112 and 122 respectively transfer the decoded data UL1 and UL2 to the upper layer after MAC processing.

Although the MAC functions 112 and 122 illustrate that one base station MAC is configured as one block, the MAC function 112 and 122 does not exclude a virtualization configuration in which one or more MAC functions are implemented in software on one hardware platform.

The switching unit 130 may be connected to the MAC functional units 112 and 122 physically configured with one or more hardware, and may also be connected with one or more virtual base station MAC functional units (not shown) physically configured with one hardware. . Since the switching unit 130 is connected to one or more RUs 210 and 220, the switching unit 130 and the RRUs 210 and 220 may each support 1: 1 physical connection. In addition, the switching unit 130 uses a transmission network transmission method such as time division transmission (TDM), frequency division transmission (FDM), frequency overlay, optical wave division transmission (WDM), etc. 130 and one or more RRUs 210 and 220 may be connected.

An embodiment of the present invention is not implemented only through the above-described apparatus and / or method, but may be implemented through a program for realizing a function corresponding to the configuration of the embodiment of the present invention or a recording medium on which the program is recorded. Such an implementation can be easily implemented by those skilled in the art to which the present invention pertains based on the description of the above-described embodiments.

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

Claims (15)

A clustered wireless base station,
A group digital processing unit including a plurality of digital unit processing units (DUs), and
A plurality of remote radio frequency units (RRUs) connected to the group digital processing unit and installed in each service target area;
Including,
Each DU includes a MAC function unit that performs transmission and reception of Medium Access Control (MAC) functions.
Each RRU includes an encoder for encoding downlink data from each DU. In claim 1,
Each DU further comprises a decoder for decoding uplink data received through an antenna. In claim 1,
Wherein each RRU further comprises a decoder for decoding uplink data received via an antenna. The method of claim 2 or 3,
Each RRU is
A modulator for modulating the encoded data;
An RF unit converting the modulated data into an RF signal and transmitting the RF signal;
And a demodulator for calculating a soft decision value or a hard decision value of uplink data received through an antenna and transmitting the calculated soft decision value or hard decision value to the group digital processing unit. In claim 4,
And the decoder combines soft decision values received from each RRU and then channel decodes. In claim 1,
Switching unit for switching the data between the plurality of DU and the plurality of RRU
Wireless base station further comprising. A group digital processing unit including a digital signal processing unit (DDU) of each base station, and a plurality of remote radio frequency units connected to the group digital processing unit through a transmission network and installed in respective service target areas; A method of processing data in a clustered wireless base station including an RRU,
Transmitting, by the group digital processing unit, downlink data received from an upper layer to at least one of the plurality of RRUs through the transport network;
The at least one RRU encoding and modulating the downlink data, and
Converting the data encoded and modulated by the at least one RRU into an RF signal and transmitting the same through an antenna;
Data processing method of a wireless base station comprising a. In claim 7,
The transmitting of the wireless base station data processing method comprising the step of processing the MAC (Medium Access Control). In claim 7,
Receiving, by at least one RRU of the plurality of RRUs, uplink data through an antenna;
The at least one RRU calculating a soft decision value or a hard decision value of the uplink data, and
Decoding the uplink data using the soft decision value or the hard decision value in the at least one RRU or corresponding DU
Data processing method of a wireless base station further comprising. In claim 9,
The decoding step
The at least one RRU transmitting the soft decision value or the hard decision value to the corresponding DU through the transport network; and
And decoding, by the corresponding DU, the uplink data using the soft decision value or the hard decision value. In claim 9,
The decoding step
The at least one RRU decoding the uplink data using the soft decision value or the hard decision value, and
And transmitting the decoded data to the corresponding DU through the transmission network. In claim 9,
The decoding may include performing the decoding after combining the determination values of the different upstream data when receiving the determination values of the different uplink data. delete delete delete
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KR101571057B1 (en) 2014-07-29 2015-11-23 (주)씨맥스와이어리스 Distributed radio base station
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US20110032910A1 (en) 2004-10-12 2011-02-10 Aarflot Torbjom Interface, apparatus, and method for communication between a radio eqipment control node one or more remote radio equipment nodes
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US20030018941A1 (en) 2000-05-01 2003-01-23 Yoshikuni Miyata Method and apparatus for demodulation
US20110032910A1 (en) 2004-10-12 2011-02-10 Aarflot Torbjom Interface, apparatus, and method for communication between a radio eqipment control node one or more remote radio equipment nodes
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