KR20150009082A - Data processing apparatus and time delay compensation method for base station - Google Patents

Abstract

The present invention relates to a base station data processing apparatus and a delay compensating method. The disclosed base station data processing apparatus comprises: a delayed information reception unit which receives delayed time information of a communication path between a first transmission device and a second transmission device; a digital signal processing unit which generates data transmitted to a remote wireless signal processing device through the first transmission device and the second transmission device; and a delay compensation unit which adjusts delayed information of the data transmitted to the remote wireless signal processing device according to the delayed time information received by the delayed information reception unit. Therefore, even when a path switching, which is switched from one communication path to the other communication path due to a factor such as the break of an optical line between the base station data processing apparatus and the remote wireless signal processing device is generated, a compensation is performed according to a variation of delayed time. Accordingly, it is possible to minimize service interruption time according to the communication path switching between the base station data processing apparatus and the remote wireless signal processing device.

Description

Technical Field [0001] The present invention relates to a base station data processing apparatus and a base station delay compensation method,

The present invention relates to a base station data processing apparatus and a base station delay compensation method, and more particularly, to a base station data processing apparatus for compensating a delay of a communication path for data transmission between a base station data processing apparatus constituting a base station and a remote radio signal processing apparatus, Delay compensation method.

A 3rd Generation Partnership Project (3GPP) mobile communication system based on WCDMA (Wideband Code Division Multiple Access) radio access technology has been widely deployed all over the world.

However, as the requirements and expectations of users and operators continue to increase and the competing wireless access technologies continue to be developed, new technologies in 3GPP mobile communication systems are required to evolve. The requirements include reduced cost per bit, increased service availability, the use of flexible frequency bands, simple structure and open interfaces, and the appropriate power consumption of user elements (UEs). In addition, prevention of unnecessary latency at a network node and efficient use of network resources are also requirements according to the evolution of 3GPP technology.

3GPP Release 8 describes an Evolved Packet Core (EPC) as a network architecture as one of mobile communication systems for meeting the above-mentioned requirements. EPC is a set of network nodes for 3GPP LTE (Long Term Evolution) system. The EPC evolves the core network of the existing 3GPP system architecture to support Evolved-UMTS Terrestrial Radio Access Network (E-UTRAN), which is an evolved RAN, And has an efficient network structure that simplifies the network node. A wireless communication system including an EPC and an E-UTRAN may be referred to as an EPS (Evolved Packet System), and the LTE mobile communication system currently being implemented and serviced in Korea corresponds to this.

In this LTE mobile communication system, a base station that guarantees mobility of a terminal device is called an eNodeB, and an eNodeB is configured by connecting a base station data processing device and a remote wireless signal processing device to a communication line such as an optical line.

Here, the base station data processing device processes the baseband signal and generates and transmits control data for controlling the remote wireless signal processing device. Such a base station data processing apparatus is also called a digital unit (DU).

The remote radio signal processing device performs functions such as analog / digital signal conversion, analog signal processing, and power amplification. Such a remote radio signal processing apparatus is also called a radio unit (RU).

Between the base station data processing device and the remote radio signal processing device, transmission devices are installed on the side of the base station data processing device and the side of the remote radio signal processing device for the purpose of reduction of the optical path and long distance transmission.

These transmission devices are operated by adopting a ring structure for protection operation by cutting the light beam, and the optical path from the base station data processing device to the remote radio signal processing device for the proper protection operation in the ring structure is provided with a plurality of Path. Due to such a structure, a plurality of paths from the base station data processing apparatus to the remote radio signal processing apparatus have different delays.

Therefore, when a path switching is performed from one communication path to another communication path due to a cause such as light beam cutting, the delay from the base station data processing device to the remote wireless signal processing device is also changed.

This path delay is a value that needs to be precisely adjusted for the frame timing information. In recent trends where the distance between the base station data processing device and the remote radio signal processing device is considered to be several tens of km or more, Do.

Korean Patent Publication No. 10-2013-0017025, publication date February 19, 2013.

According to the embodiment of the present invention, the delay of the communication path for data transmission between the base station data processing apparatus constituting the base station and the remote wireless signal processing apparatus is compensated, so that it is possible to cope with the variation of the delay time .

The problems to be solved by the present invention are not limited to those mentioned above, and another problem to be solved can be clearly understood by those skilled in the art from the following description.

A base station data processing apparatus according to an embodiment of the present invention includes a delay information receiving unit that receives delay time information of a communication path between a first transmitting apparatus and a second transmitting apparatus, A delay compensator for adjusting delay information of data to be transmitted to the remote radio signal processor according to the delay time information received by the delay information receiver, .

According to another aspect of the present invention, there is provided a base station delay compensation method comprising: receiving delay time information of a communication path between a first transmission apparatus and a second transmission apparatus; Determining whether the delay time is changed by comparing the delay time information with a delay time of the data to be transmitted to the remote wireless signal processing device through the first transmission device and the second transmission device And adjusting the delay time according to the newly received delay time information.

According to an embodiment of the present invention, there is provided an apparatus for receiving delay information of a communication path for data transmission between a base station data processing apparatus and a remote radio signal processing apparatus constituting a base station, Thereby compensating for the delay to the processing apparatus.

Therefore, even if a path switching is changed from one communication path to another communication path due to factors such as light beam cutoff between the base station data processing device and the remote wireless signal processing device, compensation is performed according to the variation of the delay time.

Therefore, there is an effect that the service interruption time due to communication path switching between the base station data processing device and the remote radio signal processing device can be minimized.

1 is a network configuration diagram of an LTE mobile communication system employing a base station data processing apparatus according to an embodiment of the present invention.
2 is a configuration diagram illustrating a communication path for data transmission between a base station data processing apparatus and a remote radio signal processing apparatus according to an embodiment of the present invention.
3 is a detailed configuration diagram of a base station data processing apparatus according to an embodiment of the present invention.
4 is a structure diagram of data according to a communication protocol between a base station data storage device and a remote wireless signal processing device according to an embodiment of the present invention.
5 is a flowchart illustrating a base station delay compensation method by a base station data processing apparatus according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions in the embodiments of the present invention, which may vary depending on the intention of the user, the intention or the custom of the operator. Therefore, the definition should be based on the contents throughout this specification.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a network configuration diagram of an LTE mobile communication system employing a base station data processing apparatus according to an embodiment of the present invention. The base station data processing apparatus according to an embodiment of the present invention can be employed in various mobile communication service systems employing a distributed base station for separating and operating a base station into a base station data processing apparatus and a remote radio signal processing apparatus. For example, in an LTE (Long Term Evolution) mobile communication system. Of course, the mobile communication system capable of employing the base station data processing apparatus according to the embodiment of the present invention is not limited to the LTE mobile communication system. For example, it can be applied to other asynchronous mobile communication systems such as a WCDMA mobile communication system, a Global System for Mobile (GSM), and other synchronous mobile communication systems such as CDMA2000.

An LTE mobile communication service system including an eNodeB, which is a base station capable of employing a base station data processing apparatus according to an embodiment of the present invention, will be described with reference to FIG.

1, the LTE mobile communication system includes an eNodeB 200, an MME (Mobility Management Entity) 140, a SGW (Serving Gateway) 150, a PGW (Packet Data Network Gateway) 160, Charging Rule Function 170, Home Subscriber Server (HSS) 180, and the like. Reference numeral 120 in FIG. 1 denotes a service area of the eNodeB 200, and reference numerals 131 to 134 denote a plurality of cells existing in the service area 120. A plurality of terminals 111 to 116 are located in the plurality of cells 131 to 134, and voice communication service and data communication service can be provided. Of course, the number of cells 131 to 134 and terminal devices 111 to 116 in the service area 120 shown in FIG. 1 is only an example.

The terminal devices 111 to 116 are located in any one of a plurality of cells 131 to 134 existing in the service area 130 of the eNodeB 120 and are provided with data communication services. For example, the terminal devices 111 to 116 may be implemented in various forms such as a smart phone, a notepad, and a tablet computer.

The eNodeB 200 is a base station that assures mobility of the terminal devices 111 to 116 as devices supporting next generation technologies and services such as LTE. The eNodeB 200 performs functions such as radio frequency (RF) transmission of a transmission signal, transmission signal strength and quality measurement, baseband signal processing, and channel card resource management. The eNodeB 200 includes a base station data processor and a remote radio signal processor connected to a communication line such as an optical line. The detailed components of the eNodeB 200 according to the embodiment of the present invention will be described below with reference to FIG.

The MME 140 is a node for managing the mobility of the terminal devices 111 to 116 and is responsible for session management, idle subscriber management, paging, and subscriber authentication functions. That is, the MME 140 processes a control signal when there is a binding request from the terminal devices 111 to 116 or another network node such as the PGW 160 or the SGW 150, a request for setting a radio bearer, and the like And performs various functions of the same control plane and receives subscriber profile information, authentication and location related data from the HSS 180 to configure an EPS bearer or an IP tunnel and manage mobility, And the like.

The SGW 150 is a user plane node that performs session control for processing payload traffic according to a set session and is interworked with the eNodeB 200 through an S1-U interface, Handoff, sets up PGW 160 and an EPS bearer (Evolved Packet System bearer), and delivers PDU (Packet Data Unit) using tunneling. The SGW 150 selects the PGW 160 based on the subscriber profile, and generates billing data for mutual settlement with the PGW of the home network when the call is an inbound roaming call.

The PGW 160 is a user plane node that assigns IP addresses of the terminal devices 111 to 116 and performs session control in cooperation with an external Internet network and a non-3GPP network. The PGW 160 is a user plane node, Maintains information, and has tunneling and IP routing functions. In addition, the PDU is delivered to the SGW 150 and the external network. When the PGW 160 is a local call, the PGW 160 performs a charging process.

The PCRF 170 provides dynamic QoS and billing rules according to the service data flow to perform communication policies and billing processing in the communication network.

The HSS 180 is a network node including a data base including subscriber information for the LTE mobile communication system and stores subscriber profile information, authentication and location related data.

2 is a configuration diagram illustrating a communication path for data transmission between a base station data processing apparatus and a remote wireless signal processing apparatus constituting an eNodeB according to an embodiment of the present invention.

2, the eNodeB 200 serving as a base station is divided into a base station data processing unit 210 and a remote radio signal processing unit 220, The processing device 220 is connected by the first transmission device 230 and the second transmission device 240.

The base station data processing unit 210 processes baseband signals and generates and transmits control data for controlling the remote wireless signal processing unit 220.

The remote wireless signal processing device 220 performs functions such as analog / digital signal conversion, analog signal processing, and power amplification.

The first transmission device 230 and the second transmission device 240 installed between the base station data processing device 210 and the remote radio signal processing device 220 are connected to the base station data processing device 220 for the purpose of saving the optical path, Side and the remote radio signal processing apparatus side.

The first transmission device 230 and the second transmission device 240 are operated by adopting a ring structure for protection operation by light ray cutting and are connected to the base station data processing device 210 for proper protection operation in the ring structure, The optical path 250 from the remote radio signal processing device 220 to the remote radio signal processing device 220 is composed of a plurality of communication paths 251 and 253 having different delays.

The first transmission apparatus 230 on the base station data processing apparatus 210 side includes a delay information transmission unit 231. The delay information transmitter 231 precisely measures the delay value of the optical path 250 having a plurality of communication paths 251 and 253 in near real time to store the delay information, The delay value of the optical line 250 is remeasured in near real time when the path switching is changed from the communication path to another communication path, and the changed delay information is stored. The delay information transmitting unit 231 transmits the delay information including the delay value of the optical path 250 to the base station data processor 210 and the remote radio signal processor 220 through a very short period To the base station data processing device 210 every time. For example, the transmission period of the delay information is set to be less than 1 second so that measurement of the delay value and transmission of the delay information are performed substantially in real time.

Although not shown in FIG. 2, the second transmission device 240 on the side of the remote radio signal processing device 220 may also include delay value measurement and delay information transmission means performing a similar function to the delay information transmission unit 231, And may transmit the delay information including the measured delay value to the base station data processing device 210.

3 is a detailed configuration diagram of a base station data processing apparatus according to an embodiment of the present invention.

The base station data processing apparatus 210 according to the embodiment of the present invention includes a digital signal processing unit 211, a delay information receiving unit 213 and a delay compensating unit 215 and a delay information storing unit 217 The digital signal processing unit 211 includes a clock unit 211a, a processor unit 211b, a modem unit 211c, and a protocol processing unit 211d.

2 and 3, the digital signal processing unit 211 controls and manages the remote wireless signal processing apparatus 220 according to a communication protocol between the base station data processing apparatus 210 and the remote wireless signal processing apparatus 220 Lt; / RTI > For example, a communication protocol between the base station data processing device 210 and the remote radio signal processing device 220 may be CPRI (Common Public Radio Interface), OBSAI (Open Base Station Architecture Initiative), or the like.

The clock unit 211a generates a system clock and inputs it to the modem unit 211c and the protocol processing unit 211d.

The modem unit 211c performs modulation and demodulation of a transmission signal for performing wireless communication and receives a transmission signal of a baseband and outputs a digital transmission signal, for example, a digital in-phase quadrature-phase (IQ) signal .

The processor unit 211b transmits control data for controlling and managing the remote wireless signal processing device 220 to the protocol processing unit 211d.

The protocol processing unit 211d synchronizes with the system clock input from the clock unit 211a, receives the digital IQ signal modulated from the modem unit 211c, converts the digital IQ signal into a format suitable for transmission according to the communication protocol, IQ signal. In addition, the protocol processing unit 211d converts the control data of the processor unit 211b into a format in accordance with the communication protocol, and transmits the converted control data.

The delay information receiver 213 receives delay time information of a communication path for data transmission between the base station data processor 210 and the remote radio signal processor 220 constituting the base station from the base station data processor 210 and the remote radio signal processor 220. [ From the delay information transmission unit 231 of the first transmission apparatus 230 through the data according to the communication protocol between the processing apparatuses 220.

The delay compensating unit 215 compensates the delay according to the delay time information received by the delay information receiving unit 213 and transmits the digital IQ data and the control data by the protocol processing unit 211d to the remote radio signal processing device 220 do. For example, the delay compensating unit 215 adjusts the delay information of the digital IQ data and control data output from the protocol processing unit 211d based on the delay information received by the delay information receiving unit 213, ). The delay compensation unit 215 compares the delay time information received by the delay information receiver 213 with the previously stored delay time information to determine whether the delay time has changed. When the delay time variation is determined, 211d to the remote radio signal processing device 220 through the first transmission device 230 after adjusting the delay information of the digital IQ data and the control data output from the first transmission device 230 .

The delay information storing unit 217 stores delay time information received by the delay information receiving unit 213. The delay time information previously stored in the delay information storage unit 217 is updated to newly received delay time information if it differs from the newly received delay time information. The updating and storing of the delay time information can be performed by the delay information receiving unit 213 or the delay compensating unit 215.

4 is a structure diagram of data according to a communication protocol between a base station data storage device and a remote wireless signal processing device according to an embodiment of the present invention. FIG. 4 shows an outline of the CPRI protocol.

4, the data according to the CPRI protocol includes a user area 311, a control and management (C & M) area 312, a synchronization area 313, an IQ data area 314, a layer 2 composed of a vendor specific area 315, an Ethernet area 316, a high-level data link control (HDLC) area 317 and an L1 inband protocol area 318. It also includes a layer 1 comprised of a TDM (Time Division Multiplexing) region 321, an electrical transmission region 322, and an optical transmission region 323.

The C & M area 312 is a field for exchanging control information between the base station data processing unit 210 and the remote radio signal processing unit 220. The C & And the synchronization area 313 is a field for time synchronization of a frame. The L1 inband protocol area 318 is a field for packet data used by an actual user and includes the layer 1 link setting and the main information of the Ethernet area 316 and the HDLC area 317 in the IQ data area 314 Field for transmission. Since this is known from the CPRI Specification V4.2 (2010-09-29), the description of other fields will be omitted.

The delay information transmitter 231 using the CPRI protocol shown in FIG. 4 may transmit and transmit delay information including the delay value of the optical path 250 to the vendor specific area 315, The delay information including the delay value of the optical path 250 can be extracted from the inherent region 315 and obtained.

5 is a flowchart illustrating a base station delay compensation method by a base station data processing apparatus according to an embodiment of the present invention.

5, a base station delay compensation method using a base station data processing apparatus includes a step (S401) of receiving delay time information of a communication path for data transmission between a base station data processing apparatus constituting a base station and a remote radio signal processing apparatus, And storing the received delay time information in an internal buffer or a separate storage unit (S403).

And comparing the received delay time information with previously stored delay time information to determine whether the delay time has changed (S405).

If it is determined that the variation of the delay time is determined, compensation for adjusting the delay information of the data to be transmitted to the remote radio signal processor according to the received delay time information is performed and then transmitted to the remote radio signal processor (S407) .

2, 3 and 5, the delay information transmitter 231 accurately measures the delay value of the optical path 250 having a plurality of communication paths 251 and 253 in near real time, And stores the changed delay information by re-measuring the delay value of the optical line 250 in near real time when a path change from one communication path to another communication path occurs due to factors such as cutting of the optical line. The delay information transmitter 231 transmits the delay information including the delay value of the optical path 250 to the base station data processing device 210 every very short period.

The delay information receiving unit 213 of the base station data processing device 210 receives the delay information of the optical path 250 having the communication paths 251 and 253 from the delay information transmitting unit 231, The delay compensating unit 215 of the base station data processing apparatus 210 supplies the delay time information received by the delay information receiving unit 213 to the internal buffer or delay information storage unit 217 (S403). ≪ / RTI >

The delay compensation unit 215 of the base station data processing device 210 compares the delay time information received in step S401 with the delay time information stored before step S401 to determine whether the delay time has changed. For example, the delay compensating unit 215 compares the delay time information used in the process of determining whether the delay time has already been performed in the preceding control cycle with the currently received delay time information, and determines whether the delay value has changed (S405 ).

If it is determined that the delay time has changed, the delay compensating unit 215 of the base station data processing device 210 transmits delay information of the digital IQ data or control data generated by the digital signal processing unit 211 to the delay received in step S401 Digital IQ data or control data whose delay is compensated by the delay compensating unit 215 is supplied to the first transmission device 230, the optical path 250 and the second transmission device 240 To the remote wireless signal processing device 220 (S407).

Each block of the block diagrams attached hereto and combinations of steps of the flowchart diagrams may be performed by computer program instructions. These computer program instructions may be loaded into a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus so that the instructions, which may be executed by a processor of a computer or other programmable data processing apparatus, And means for performing the functions described in each step are created. These computer program instructions may also be stored in a computer usable or computer readable memory capable of directing a computer or other programmable data processing apparatus to implement the functionality in a particular manner so that the computer usable or computer readable memory It is also possible for the instructions stored in the block diagram to produce a manufacturing item containing instruction means for performing the functions described in each block or flowchart of the block diagram. Computer program instructions may also be stored on a computer or other programmable data processing equipment so that a series of operating steps may be performed on a computer or other programmable data processing equipment to create a computer- It is also possible that the instructions that perform the processing equipment provide the steps for executing the functions described in each block of the block diagram and at each step of the flowchart.

Also, each block or each step may represent a module, segment, or portion of code that includes one or more executable instructions for executing the specified logical function (s). It should also be noted that in some alternative embodiments, the functions mentioned in the blocks or steps may occur out of order. For example, two blocks or steps shown in succession may in fact be performed substantially concurrently, or the blocks or steps may sometimes be performed in reverse order according to the corresponding function.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

According to an embodiment of the present invention, there is provided an apparatus for receiving a delay information of a communication path for data transmission between a base station data processing apparatus and a remote radio signal processing apparatus constituting a base station, Thereby compensating for the delay to the processing apparatus.

Therefore, even if a path switching is changed from one communication path to another communication path due to factors such as light beam cutoff between the base station data processing device and the remote wireless signal processing device, compensation is performed according to the variation of the delay time.

Therefore, it is possible to minimize the service interruption time due to communication path switching between the base station data processing device and the remote radio signal processing device.

The base station data processing apparatus and the base station delay compensation method according to embodiments of the present invention can be applied to an asynchronous mobile communication system such as an LTE mobile communication system, a WCDMA mobile communication system, a GSM (Global System for Mobile), or a synchronous mobile communication system such as CDMA2000 Can be used.

200: eNodeB 210: base station data processing device
211: digital signal processor 213: delay information receiver
215: delay compensation unit 217: delay information storage unit
220: remote radio signal processing device 230: first transmission device
240: second transmission device

Claims (5)

A delay information receiver for receiving delay time information of a communication path between the first transmission device and the second transmission device;
A digital signal processor for generating data to be transmitted to the remote wireless signal processor through the first transmission device and the second transmission device,
And a delay compensation unit for adjusting delay information of data to be transmitted to the remote radio signal processor according to the delay time information received by the delay information receiver,
And a base station.
The method according to claim 1,
Wherein the delay information receiving unit receives the delay time information from the first transmitting apparatus or the second transmitting apparatus
Base station data processing unit.
The method according to claim 1,
And a delay information storage unit for storing the delay time information,
And the delay time information previously stored in the delay information storage unit is updated if it is different from the delay time information newly received
Base station data processing unit.
Receiving delay time information of a communication path between the first transmission device and the second transmission device;
Comparing the newly received delay time information with previously received delay time information to determine whether the delay time has changed;
Adjusting delay information of data to be transmitted to the remote radio signal processor through the first transmission device and the second transmission device according to the newly received delay time information when the variation of the delay time is determined
/ RTI >
5. The method of claim 4,
Wherein the step of receiving the delay time information comprises receiving the delay time information from the first transmission device or the second transmission device
Base station delay compensation method.

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