KR20100117813A - Apparatus and method for transmitting/receiving common public radio interface in broadband wireless communication system - Google Patents

Apparatus and method for transmitting/receiving common public radio interface in broadband wireless communication system Download PDF

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Publication number
KR20100117813A
KR20100117813A KR1020090036465A KR20090036465A KR20100117813A KR 20100117813 A KR20100117813 A KR 20100117813A KR 1020090036465 A KR1020090036465 A KR 1020090036465A KR 20090036465 A KR20090036465 A KR 20090036465A KR 20100117813 A KR20100117813 A KR 20100117813A
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South Korea
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data
cpri
frame
module
remote
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KR1020090036465A
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Korean (ko)
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권혁인
정진태
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주식회사 포스코아이씨티
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Priority to KR1020090036465A priority Critical patent/KR20100117813A/en
Publication of KR20100117813A publication Critical patent/KR20100117813A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/155—Ground-based stations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/02—Inter-networking arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/04—Interfaces between hierarchically different network devices
    • H04W92/06—Interfaces between hierarchically different network devices between gateways and public network devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices

Abstract

The present invention relates to a CPRI transmission and reception apparatus and method applying a CPRI (Common Public Radio Interface) standard between a base station and a remote BS in a broadband wireless communication system, and includes 1PPS received from baseband data and a global positioning system (GPS). (pulse per second) converts the data rate of the signal to transmit the converted baseband data and the synchronization signal, and maps the converted baseband data to form a CPRI frame using a CPRI mapping method, and the mapped CPRI A frame is transmitted in synchronization with the synchronization signal, and the stuffing data area in at least one basic frame constituting the mapped CPRI frame includes information indicating the 1PPS signal.

Description

Apparatus and method for transmitting / receiving Common Public Radio Interface in broadband wireless communication system

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a broadband wireless communication system, and in particular, applies a Common Public Radio Interface (CPRI) standard between a base station (BS) and a remote BS in a broadband wireless communication system. It relates to a CPRI transmission and reception device and a method.

Broadband wireless communication systems have been developed to provide various services such as broadcasting, multimedia video, and multimedia messages. Particularly, in the broadband wireless communication system, active research is being conducted to stably provide users with services of high quality of service (QoS: Quality of Service, hereinafter referred to as 'QoS'). In addition, research is being actively conducted to ensure mobility and QoS and to provide high-speed services reliably in the broadband wireless communication system. The representative broadband wireless communication system is orthogonal frequency division multiplexing (OFDM). Institute of Electrical and Electronics Engineers (IEEE) 802.16d / with Multiplexing (hereinafter referred to as "OFDM") / Orthogonal Frequency Division Multiple Access (OFDMA) scheme e-based wireless portable Internet systems such as Wibro (Wireless Broadband Internet) or WiMAX (Wireless Interoperability for Microwave Access) systems.

The Common Public Radio Interface (CPRI) specification is a specification for the main internal interface of the wireless BS between the Radio Equipment Control (RE) and the Radio Equipment (RE). To provide differentiated, flexible and efficient products. Here, the CPRI standard has items necessary for transmission, connection, and control, and includes procedures for data on a user side, a transmission method in terms of control and management, and data for synchronization.

Therefore, in a broadband wireless communication system, for communication between a digital module processing a baseband signal of a BS corresponding to the RE and an RF module processing a radio frequency (RF) signal of a remote BS corresponding to the REC. CPRI specifications can be applied. Here, the digital module and the RF module may be implemented as one unit in the BS, or the RF module may be separated from the digital module by a predetermined distance and implemented in the remote BS. An RF module separated from the digital module by a predetermined distance is called a remote RF module, and a digital module in one BS may be implemented by being connected to each remote RF module in a plurality of remote BSs.

However, CPRI standards to date have been described to be easily applied to 3GPP (3rd Generation Partnership Project) standard system of Wideband Code Division Multiple Access (WCDMA). In addition, when applied to a wireless portable Internet system or WiMAX system may cause problems in the operation of the system. In particular, when the CPRI standard is applied in a wireless portable Internet system or a WiMAX system to perform communication between a digital module in a BS and a remote RF module in a remote BS, data transmission and reception between the BS and the remote BS are insufficient. The time required for synchronization with the system clock signal to receive may be increased. In addition, the reception of the data signal may be delayed due to the increase in the synchronization time required.

Accordingly, an object of the present invention is to provide an apparatus and method for CPRI transmission and reception in a broadband wireless communication system.

In addition, another object of the present invention is to provide an apparatus and method for CPRI transmission and reception for reducing the time required to detect a synchronization signal of a CPRI frame in a broadband wireless communication system.

The method of the present invention for achieving the above object, and transmits the baseband data and the synchronization signal by converting the data rate of the 1PPS (pulse per second) signal received from the baseband data and the global positioning system (GPS) Making; Mapping the converted baseband data to form a CPRI frame using a CPRI mapping scheme; And transmitting the mapped CPRI frame in synchronization with the synchronization signal, wherein a stuffing data area in at least one basic frame constituting the mapped CPRI frame includes information indicating the 1PPS signal. It is characterized by.

Another method of the present invention for achieving the above object comprises the steps of receiving a CPRI frame via a Common Public Radio Interface (CPRI) link; Detecting information corresponding to a 1 pulse per second (PPS) signal in a region of baseband data and stuffing data from the CPRI frame using a CPRI mapping scheme; And synchronizing the baseband data reception using the detected information, wherein the area of the stuffing data is present in at least one basic frame constituting the CPRI frame.

An apparatus of the present invention for achieving the above object, a matcher for converting the data rate of the baseband data and the pulse per second (PPS) signal received from the Global Positioning System (GPS); A mapper configured to map the converted baseband data by a CPRI mapping method to construct a CPRI frame; And an interface unit configured to transmit the configured CPRI frame in synchronization with the synchronization signal, wherein a stuffing data area in at least one basic frame constituting the CPRI frame includes information indicating the 1PPS signal. It is done.

Another apparatus of the present invention for achieving the above object, the interface device for receiving a CPRI frame via a CPRI (Common Public Radio Interface) link; A demapping machine for detecting information corresponding to a pulse per second (PPS) signal in a region of baseband data and stuffing data from the CPRI frame using a CPRI mapping scheme; And a synchronizer for synchronizing the baseband data reception using the detected information, wherein the area of the stuffing data is present in at least one basic frame constituting the CPRI frame.

The present invention provides an apparatus and method for CPRI transmission and reception according to the CPRI standard in a broadband wireless communication system. The present invention also provides an apparatus and method for CPRI transmission and reception applicable to a broadband wireless communication system based on IEEE 802.16d / e.

In addition, the present invention, by transmitting the control information and the synchronization information in the stuffing data (stuffing data) for matching the data rate of the transmission and reception data when transmitting data over the CPRI link, the reception side for receiving the CPRI frame The time required for detecting the synchronization signal and the complexity of the implementation apparatus can be reduced.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that in the following description, only parts necessary for understanding the operation according to the present invention will be described, and descriptions of other parts will be omitted so as not to distract from the gist of the present invention.

The present invention relates to a wireless portable Internet system based on the Institute of Electrical and Electronics Engineers (IEEE) 802.16d / e, which is a broadband wireless communication system, such as a Wibro (Wireless Broadband Internet) or WiMAX (Wireless Worldwide Interoperability for Microwave Access) system. We propose an apparatus and method for CPRI transmission / reception using the Common Public Radio Interface (CPRI) standard. Here, in the embodiment of the present invention, a digital module for processing a baseband signal in a base station (BS) (hereinafter referred to as "BS"), and a remote is separated from the BS by a predetermined distance. remote) We propose an apparatus and method for CPRI transmission / reception between RF modules that process a radio frequency (RF) signal in a BS. Then, the BS and the remote BS in the broadband wireless communication system according to the embodiment of the present invention will be described in more detail with reference to FIG. 1.

1 is a view schematically showing the structure of a BS and a remote BS in a broadband wireless communication system according to an embodiment of the present invention. Here, FIG. 1 is a diagram schematically illustrating a structure of a digital module in a BS to which a CPRI standard is applied to communication between a BS and a remote BS in a broadband wireless communication system and a remote RF module in a remote BS.

Referring to FIG. 1, the digital module 100 in the BS is remotely connected to the remote RF module 150 in the remote BS by an electric cable or an optical cable. The CPRI standard is applied to the communication between the digital module 100 in the BS and the remote RF module 150 in the remote BS. Accordingly, the downlink and uplink between the digital module 100 and the remote RF module 150 are CPRI. Implemented by link Here, the remote RF module 150 is separated from the digital module 100 by a predetermined distance and implemented in the remote BS. As described above, the remote RF module 150 is remotely connected to the digital module 100 by an electric cable or an optical cable. In this case, the digital module in one BS may be implemented to be remotely connected to each remote RF module in the plurality of remote BSs.

The digital module 100 in the BS includes a digital processor 1 (110) for merging / extracting 1 pulse per second (PPS) signal, baseband data such as IQ data, and Ethernet data, and a remote RF module in a remote BS. Interface unit 1 (120) for serial / parallel conversion processing of the digital data for performing communication with the 150. In addition, the remote RF module 150 in the remote BS is an interface unit 2 (160) for serial / parallel conversion processing digital data for performing communication with the digital module 100 in the BS through the CPRI link, And a digital processor 2 (170) for merging / extracting 1PPS signal, baseband data, and Ethernet data.

The digital processor 1 (110) is a matcher 112 for receiving a 1PPS signal and data and matching the data rate of the received data, and a mapper for mapping the 1PPS signal and data in accordance with the application of the CPRI standard. 114. The 1PPS signal is a timing signal received from a GPS (Global Positioning System), and the received data is baseband data and Ethernet data. The matcher 112 processes the received data using synchronization logic, and outputs a sync signal and data to the mapper 114. Here, the synchronization signal Sync is a signal for synchronizing the system when performing communication between the digital module 100 in the BS and the remote RF module 150 in the remote BS.

The matcher 112 generates stuffing data that matches a data rate of data transmitted and received between the digital module 100 and the remote RF module, and the stuffing data corresponds to the stuffing data. Information indicating a 1PPS signal or 1PPS signal is inserted, and data including the sync signal Sync and the stuffing data is output to the mapper 114. The mapper 114 maps data to a frame defined by the CPRI standard using a corresponding mapping scheme, and outputs the mapped data and the synchronization signal Sync to the interface device 1 120. Here, the mapper 114 merges OAM information, such as Ethernet, with the data corresponding to the CPRI standard, and outputs the data to the interface device 1 120.

The interface device 1 120 receives the data mapped to the synchronization signal Sync from the mapper 114 of the digital processor 1110. The interfacer 1 120 processes the received data for transmission to the remote RF module 150 and then transmits the processed data to the remote RF module 150 through a CPRI link. Here, the interface device 1 120 includes a serialization converter 122 for converting data input in parallel to serial data, and the serialization converter 122 is synchronized in synchronization with the synchronization signal Sync. Convert type data to serial data. That is, the serialization converter 122 converts the parallel data including the 1PPS signal and the data into serial data, and converts the serial data through a CPRI link to the interface device of the remote RF module 150. 2 (160).

The interface device 2 160 is included in the remote RF module 150 in correspondence with the interface device 1 120 of the digital module 100 to transmit and receive data through a CPRI link. Receive serial data from the interface unit 1 (120) of the digital module 100 via a CPRI link. Here, the interfacer 2 160 extracts a synchronization signal for synchronization between systems during communication between the digital module 100 and the remote RF module 150 from data received through the CPRI link. . That is, the interface device 2 160 extracts the synchronization signal Sync from the serial data received from the interface device 1 120 through a CPRI link, and extracts the synchronization signal Sync from the digital processor 2. Output to (170).

In addition, the interface unit 2 160 includes a parallel converter 162 for converting data input in a serial form into data in a parallel form, and the parallel converter 162 is serially synchronized with the synchronization signal Sync. Convert type data to parallel data. That is, the parallelization converter 162 converts serial data including a 1PPS signal and data into parallel data, and transmits the data to the digital processor 2 170 to demap the parallel data. .

The digital processor 2 (170) is a demapping machine (172) for demapping the parallel data received from the interface unit 2 (160) in accordance with the application of the CPRI standard, and the 1PPS signal from the de-mapped data. And a synchronizer 174 for outputting data. Here, the data is baseband data and Ethernet data. The demapper 172 demaps data mapped to the frame in a frame defined by a CPRI standard using a corresponding mapping scheme, and synchronizes the demapped data and the synchronization signal Sync. ) The synchronizer 174 detects a 1PPS signal included in stuffing data from the demapped data using synchronization logic, and outputs the 1PPS signal and data.

That is, the digital processor 2 170 detects baseband data and 1PPS signal (or information corresponding to 1PPS) in a frame transmitted from the digital module 100 in the BS by using a CPRI mapping method, and the 1PPS signal. Synchronize the reception of the baseband data by using. At this time, as the remote RF module 150 detects information indicating a 1PP signal in the stuffing data area, it is possible to quickly and easily detect information for receiving baseband data, and to detect delays occurring in the BS and the remote BS. Synchronization for baseband data reception can be performed quickly without consideration. Next, a hyper frame defined in the CPRI standard for data transmission and reception between the BS and the remote BS will be described with reference to FIG. 2.

2 is a diagram schematically illustrating a hyper frame structure defined in the CPRI standard for CPRI transmission and reception in a broadband wireless communication system according to an embodiment of the present invention. 2 is a diagram schematically illustrating a structure of one hyper frame defined in the CPRI standard.

Referring to FIG. 2, in the hyper frame, Ns denotes a subchannel index, Xs denotes an index of a control word in a subchannel, and the hyper frame includes 256 basic frames. Include. The basic frame is as shown in FIG. 3 is a diagram schematically illustrating the structure of a basic frame defined in the CPRI standard for CPRI transmission and reception in a broadband wireless communication system according to an embodiment of the present invention. In the basic frame, W denotes a word index, B denotes an address index of each bit in a word, and Y denotes an address index of each byte in a word. The basic frame includes 16 words, the start word of the basic frame becomes a control word, and the next word of the start word becomes a baseband data block.

Then, comma data is generated for frame synchronization when data is transmitted and received between the BS and the remote BS in the hyper frame, and the comma byte is transmitted as a comma byte through the start basic frame in the hyper frame. In addition, a synchronization and timing field including synchronization information or timing information in the hyper frame is transmitted through 64, 128, and 192 basic frames 200.

Here, the field including the synchronization or timing information is divided into a plurality of basic frames, and a comma byte is transmitted through the start basic frame of the hyper frame so that the synchronization or timing information is located in the middle of the hyper frame. ), The remote RF module 150 should consider the delay between the BS and the remote BS and the delay within the BS and the remote BS for synchronization with the digital module 100. However, in the present invention, the digital module 100 in the BS includes the information (or data) indicating the 1PPS signal in the stuffing data area of the basic frame and transmits the information to the remote RF module 150 in the remote BS. 150 detects baseband data in a basic frame transmitted from the digital module 100, and detects information representing a 1PP signal in the stuffing data area. Accordingly, the remote RF module 150 in the remote BS can quickly and easily detect a signal for synchronization in a frame, and reduce the synchronization time required for baseband data reception without considering delays as described above. Band data can be received at high speed. Next, a CPRI frame for data transmission and reception between the BS and the remote BS will be described in more detail with reference to FIG. 4.

4 is a view schematically showing a format of a CPRI frame for transmitting and receiving CPRI in a broadband wireless communication system according to an embodiment of the present invention.

Referring to FIG. 4, the CPRI frame includes 150 hyper frames, and the hyper frame includes 256 basic frames as described above. Here, as the synchronization and timing fields are transmitted by 64, 128, and 192 basic frames, respectively, in the 150 hyper frames, the BS and the remote BS use the synchronization and timing fields transmitted through the basic frames, respectively. It transmits and receives number (HFN: Hyper Frame Number, hereinafter referred to as "HFN") and basic frame number (BFN: Basic Frame Number, hereinafter referred to as "BFN") information.

The remote BS performs frame synchronization using comma bytes, that is, comma data transmitted through the start basic frame of the hyper frame, and after the frame synchronization is completed, HFN and BFN are performed using the synchronization and timing fields. Check it. In addition, the BS maps the data including the 1PPS signal by using a mapping method corresponding to the CPRI standard, and then transmits the data through the CPRI frame. In this case, the digital module 100 in the BS includes information indicating a 1PPS signal in the stuffing data area, and then maps the data in a mapping scheme corresponding to CPRI standard to map the CPRI frame to a remote RF module in the remote BS ( 150). The remote RF module 150 detects information indicating a 1PP signal in a baseband data and a stuffing data region in a transmitted CPRI frame, and in particular, the remote RF module 150 detects information indicating the 1PP signal. Thereby quickly and easily detecting information for synchronization of baseband data reception. Next, a data mapping method corresponding to the CPRI standard for data transmission and reception between the BS and the remote BS will be described in more detail with reference to FIG. 5.

FIG. 5 is a diagram schematically showing data mapping corresponding to CPRI standard for CPRI transmission and reception in a broadband wireless communication system according to an embodiment of the present invention.

Referring to FIG. 5, baseband data, that is, IQ samples (IQ samples) are mapped for each antenna carrier to be transmitted through an antenna-carrier (AxC) provided by one independent antenna, and the baseband data is mapped. Antenna carriers are included in an antenna carrier group. That is, the antenna carrier group includes baseband data AC0 and AC1 for the antenna carrier. The AxC Container Group includes baseband data AC0 and AC1 for the antenna carrier and matches data rates of the baseband data AC0 and AC1 according to the application of the CPRI standard. Stuffing data (510, 520, 530).

The stuffing data (510, 520, 530) means data for matching the data rate of the data transmitted and received between the BS and the remote BS. The stuffing data 510, 520, and 530 does not include specific information, and is waiting data for maintaining a reception waiting state when receiving data of a remote BS. In other words, when the remote RF module 150 in the remote BS receives baseband data from the digital module 100 in the BS, the data rate of the remote RF module 150 and the data of the digital module 100 are determined. Stuffing data (510, 520, 530) is inserted into every baseband data (AC0, AC1) transmitted by the digital module 100 to match the data rate. The remote RF module 150 maintains data reception for a predetermined time by stuffing data 510, 520, and 530. The data rate of the remote RF module 150 and the data rate of the digital module 100 are maintained. Matches.

At this time, in the broadband wireless communication system according to the embodiment of the present invention, the synchronization information is included in the stuffing data (510, 520, 530) for synchronization of data reception when receiving data of the remote BS. In other words, the digital module 100 includes data (information) indicating a 1PPS signal in the stuffing data (510, 520, 530) region, and includes the stuffing data (510, 520, 530) and baseband data (AC0, AC1). The group is mapped to a CPRI frame, and the AxC container group is transmitted to the remote RF module 150 through the CPRI frame.

Here, as the data representing the 1PPS signal is included in the stuffing data (510, 520, 530) area and transmitted, synchronization information for synchronizing data reception when receiving data of the remote BS is transmitted to the remote RF module 150 of the remote BS. Transmitted, and the 1PPS signal becomes synchronization information. Also, as described above, when the remote RF module 150 receives data of the remote RF module 150 by the stuffing data 510, 520, and 530 including data representing the 1PPS signal, the data rate of the digital module 100 is increased. Is matched with The remote RF module 150 synchronizes a CPRI frame by using a 1PPS signal represented by data included in the stuffing data 510, 520, and 530, and synchronizes data reception.

That is, the remote RF module 150 checks the 1PPS signal through the stuffing data (510, 520, 530) in the hyper frame of the CPRI frame, and synchronizes data reception using the 1PPS signal. Here, the stuffing data 510, 520, 530 may include not only 1PPS signal but also data (information) indicating an IP (Internet Protocol) address of a module that receives control information, for example, baseband data. Next, a data structure by a data mapping method corresponding to the CPRI standard will be described in detail with reference to FIG. 6.

FIG. 6 is a diagram schematically illustrating a structure of data mapped according to CPRI standards when CPRI transmission and reception in a broadband wireless communication system according to an embodiment of the present invention.

Referring to FIG. 6, in the data 600 mapped to the basic frame, one basic frame includes 16 time slots, and the first time slots 610 and 620 of each basic frame include a control word. Time slots 620 and 640 include stuffing data, and the remaining time slots include baseband data. Here, the time slots 620 and 640 corresponding to the stuffing data include data representing a 1PPS signal as described above.

When the digital module 100 receives the 1PPS signal from the data and the GPS, the digital module 100 generates stuffing data for data rate matching of data transmitted / received with the remote RF module 150 and synchronizes the CPRI frame with the 1PPS signal. The digital module 100 generates comma data according to CPRI frame synchronization, and maps the data to CPRI frames according to CPRI standards. In this case, the digital module 100 includes data representing a 1PPS signal in the stuffing data area of the CPRI frame. Here, the data indicating the IP address of the module receiving the baseband data may be included in the stuffing data area of the CPRI frame. In addition, the digital module 100 transmits a CPRI frame to the remote RF module 150, and stuffing data including data representing a 1PPS signal is transmitted for each basic frame constituting a hyper frame of the CPRI frame. The remote RF module 150 extracts a 1PPS signal included in the stuffing data, and synchronizes a CPRI frame, a hyper frame, and a basic frame between the digital module 100 and the remote RF module 150 by the 1PPS signal. do.

The remote RF module 150 checks the comma byte in the hyper frame of the CPRI frame received from the digital module 100 and performs frame synchronization using the comma byte. In addition, after completing the frame synchronization, the remote RF module 150 extracts HFN and BFN using the synchronization and timing fields of the hyper frame. In addition, the remote RF module 150 matches the data rate using the stuffing data in the hyper frame of the CPRI frame, checks the 1PPS signal included in the stuffing data area, and synchronizes data reception using the 1PPS signal. do.

Here, the remote RF module 150 synchronizes baseband data reception using comma data in the hyper frame, synchronization and timing fields, as well as 1PPS signals identified in the stuffing data area. In particular, when transmitting and receiving data between the digital module 100 in the BS and the remote RF module 150 in the remote BS, the remote RF module 150 receives the baseband data by transmitting and receiving a 1PPS signal through the stuffing data area. The 1PPS signal for synchronization can be detected quickly and easily, and data transmission / reception synchronization between the digital module 100 and the remote RF module 150 is performed more accurately and at higher speed, and as a result, data can be transmitted and received at high speed. have. Next, the operation of data transmission of the digital module in the broadband wireless communication system will be described in more detail with reference to FIG. 7.

7 is a diagram schematically illustrating a data transmission operation of a digital module in a BS in a broadband wireless communication system according to an embodiment of the present invention.

Referring to FIG. 7, in operation S710, the digital module 100 receives data and a 1PPS signal, generates stuffing data for data rate matching of data transmitted / received with the remote RF module 150, and applies the 1PPS signal to the 1PPS signal. Synchronize the CPRI frame. In operation S720, the digital module 100 generates comma data according to CPRI frame synchronization, and maps data to CPRI frames according to CPRI standards. The stuffing data area of the CPRI frame includes data representing a 1PPS signal or data representing an IP address of a module receiving baseband data. Here, since the data mapping has been described above in detail, a detailed description thereof will be omitted.

In operation S730, the digital module 100 converts the data mapped to the CPRI frame into serial data, and transmits the converted data to the remote RF module 150 through the CPRI link. As the data representing the 1PPS signal is included in the stuffing data area of the CPRI frame, the 1PPS signal is transmitted to the remote RF module 150 of the remote BS for each basic frame constituting the hyper frame of the CPRI frame. Next, the data reception of the remote RF module in the broadband wireless communication system will be described in more detail with reference to FIG. 8.

8 is a diagram schematically illustrating a data receiving operation of a remote RF module in a remote BS in a broadband wireless communication system according to an embodiment of the present invention.

Referring to FIG. 8, in step S810, the remote RF module 150 receives data through a CPRI link and converts the received data into parallel data. In operation S820, the remote RF module 150 demaps data using a CPRI standard mapping method in a hyper frame of a CPRI frame received from the digital module 100 according to data reception through a CPRI link.

In operation S830, the remote RF module 150 performs frame synchronization using a comma byte included in a hyper frame of a CPRI frame. After completing the frame synchronization, the remote RF module 150 uses an HFN and a synchronization field and a timing field. Extract the BFN. The remote RF module 150 matches a data rate through stuffing data in a hyper frame of a CPRI frame, checks a 1PPS signal included in the stuffing data area, and synchronizes data reception using the 1PPS signal.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.

1 is a view schematically showing the structure of a BS and a remote BS in a broadband wireless communication system according to an embodiment of the present invention.

FIG. 2 schematically illustrates a hyperframe structure defined in CPRI standard for CPRI transmission and reception in a broadband wireless communication system according to an embodiment of the present invention. FIG.

3 is a view schematically showing the structure of a basic frame defined in the CPRI standard for CPRI transmission and reception in a broadband wireless communication system according to an embodiment of the present invention.

4 is a diagram schematically illustrating a format of a CPRI frame for CPRI transmission and reception in a broadband wireless communication system according to an embodiment of the present invention.

FIG. 5 schematically illustrates data mapping corresponding to CPRI standards for CPRI transmission and reception in a broadband wireless communication system according to an embodiment of the present invention. FIG.

FIG. 6 is a diagram schematically showing a structure of data mapped according to CPRI standard when CPRI is transmitted and received in a broadband wireless communication system according to an embodiment of the present invention.

7 is a diagram schematically illustrating a data transmission operation of a digital module in a BS in a broadband wireless communication system according to an embodiment of the present invention.

8 is a diagram schematically illustrating a data receiving operation of a remote RF module in a remote BS in a broadband wireless communication system according to an embodiment of the present invention.

Claims (8)

In the Common Public Radio Interface (CPRI) transmission method in a broadband wireless communication system, Converting a data rate of baseband data and a pulse per second (PPS) signal received from a global positioning system (GPS) and transmitting the converted baseband data and a synchronization signal; Mapping the converted baseband data to form a CPRI frame using a CPRI mapping scheme; And Transmitting the mapped CPRI frame in synchronization with the synchronization signal, The stuffing data area of at least one basic frame constituting the mapped CPRI frame includes information indicating the 1PPS signal. The method of claim 1, The stuffing data further includes information indicating an Internet Protocol (IP) address of the module that receives the baseband data. In the method of receiving a common public radio interface (CPRI) in a broadband wireless communication system, Receiving a CPRI frame through a Common Public Radio Interface (CPRI) link; Detecting information corresponding to a 1 pulse per second (PPS) signal in a region of baseband data and stuffing data from the CPRI frame using a CPRI mapping scheme; And Synchronizing the baseband data reception using the detected information; And the area of the stuffing data is present in at least one basic frame constituting the CPRI frame. The method of claim 3, The detecting may further include detecting information indicating an Internet Protocol (IP) address of a module that receives the baseband data in the region of the stuffing data. A device for transmitting a common public radio interface (CPRI) of a base station in a broadband wireless communication system, A matcher for converting a data rate of baseband data and a pulse per second (PPS) signal received from a global positioning system (GPS); A mapper configured to map the converted baseband data by a CPRI mapping method to construct a CPRI frame; And An interface unit for transmitting the configured CPRI frame in synchronization with the synchronization signal, The stuffing data area in at least one basic frame constituting the CPRI frame, the information indicating the 1PPS signal is included. The method of claim 5, The stuffing data further includes information indicating an Internet Protocol (IP) address of the module for receiving the baseband data. In the CPRI (Common Public Radio Interface) receiving device in a broadband wireless communication system, An interface unit for receiving CPRI frames through a common public radio interface (CPRI) link; A demapping machine for detecting information corresponding to a 1 PPS signal in a region of baseband data and stuffing data from the CPRI frame using a CPRI mapping method; And A synchronizer for synchronizing the baseband data reception using the detected information; And the region of the stuffing data is present in at least one basic frame constituting the CPRI frame. The method of claim 7, wherein And the demapping unit further detects information indicating an Internet Protocol (IP) address of a module that receives the baseband data in the region of the stuffing data.
KR1020090036465A 2009-04-27 2009-04-27 Apparatus and method for transmitting/receiving common public radio interface in broadband wireless communication system KR20100117813A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140033176A (en) * 2011-06-09 2014-03-17 앤드류 엘엘씨 Distributed antenna system interface for processing digital signals in a standardized format
US9118418B2 (en) 2012-12-17 2015-08-25 Electronics And Telecommunications Research Institute High speed data serial connection interface apparatus, CPRI transmitting and receiving method
KR20170086583A (en) * 2014-11-20 2017-07-26 후아웨이 테크놀러지 컴퍼니 리미티드 Data transmission method, communication device, and communication system
EP3285414A4 (en) * 2015-06-16 2018-05-30 Huawei Technologies Co., Ltd. Signal conversion method, and signal conversion apparatus and system
KR20190035362A (en) * 2017-09-26 2019-04-03 에스케이텔레콤 주식회사 Method for converting signals

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140033176A (en) * 2011-06-09 2014-03-17 앤드류 엘엘씨 Distributed antenna system interface for processing digital signals in a standardized format
US11310092B2 (en) 2011-06-09 2022-04-19 Commscope Technologies Llc Distributed antenna system interface for processing digital signals in a standardized format
US9118418B2 (en) 2012-12-17 2015-08-25 Electronics And Telecommunications Research Institute High speed data serial connection interface apparatus, CPRI transmitting and receiving method
KR20170086583A (en) * 2014-11-20 2017-07-26 후아웨이 테크놀러지 컴퍼니 리미티드 Data transmission method, communication device, and communication system
EP3285414A4 (en) * 2015-06-16 2018-05-30 Huawei Technologies Co., Ltd. Signal conversion method, and signal conversion apparatus and system
KR20190035362A (en) * 2017-09-26 2019-04-03 에스케이텔레콤 주식회사 Method for converting signals

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