KR100288147B1 - Synchronization signal aquisition apparatus and its method in cdma base station - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to an apparatus and method for acquiring a synchronization signal of a base station using a code division multiple access scheme.

2. The problem to be solved by the invention

The present invention provides a synchronization signal through a transmission path operated by a CDMA base station and reproduces this synchronization information closely with an actual synchronization signal, thereby providing a synchronization signal and a current required for operation without installing a GPS antenna in the base station. An object of the present invention is to provide an apparatus and a method for obtaining a synchronization signal capable of acquiring time information.

3. Summary of Solution to Invention

The present invention receives a periodic electrical synchronization signal and current time information, inserts a bit into a synchronization frame of a transmission path, delay time information between the synchronization frame of the transmission path and the actual synchronization signal, and a round trip or one way transmission path. A first step of transmitting the transmission delay time information and the current time information through the transmission path; A second step of predicting and generating a current time and a synchronization pulse of a device requiring a synchronization signal based on the received synchronization information after receiving the transmitted synchronization information through a transmission path; And a third step of detecting an operation stop doctor or system failure by an operator and performing termination.

4. Important uses of the invention

The present invention is used for a base station of the CDMA method.

Description

Synchronization signal acquisition apparatus and method thereof of base station using code division multiple access method {SYNCHRONIZATION SIGNAL AQUISITION APPARATUS AND ITS METHOD IN CDMA BASE STATION}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for acquiring a synchronization signal of a base station using a code division multiple access (CDMA) scheme. In particular, the present invention relates to an apparatus for synchronizing information supplied through a transmission path operated by a base station of a CDMA scheme. The present invention relates to an apparatus for acquiring a synchronizing signal which can be reproduced close to the synchronizing signal, and a method thereof, and a computer-readable recording medium storing a program for realizing the same.

1A and 1B are exemplary views illustrating a configuration of a base station in a conventional CDMA scheme.

FIG. 1A is a configuration for explaining a call path and includes an exchange station 110, a base station 120, 121, a terminal 130, a GPS receiver 140, 141, and a GPS satellite 150.

FIG. 1B is a configuration for explaining synchronization signal acquisition, and is comprised of an exchange 111, a base station 122, and a GPS receiver 142.

Referring to FIGS. 1A and 1B, a synchronization acquisition process in operation of a conventional CDMA base station is as follows.

The GPS receivers 140 and 141, which receive time and position information from the GPS satellite 150, typically provide a standard clock and current time information (TOD) and even second pulse signals to the CDMA base station. By synchronizing the synchronization of the base station 120 and the base station 121, the terminal 130 is able to perform a smooth call between a plurality of base stations (120, 121).

That is, in the transmission process, when the base stations 120 and 121 receive predetermined transmission information from the switching center 110, the base stations transmit the terminal 130 to the simultaneous synchronization signal generated by the GPS receivers 140 and 141. The terminal 130 receives the two signals in consideration of the distance error between the base stations 120 and 121, and reproduces the above-mentioned predetermined information by considering the received information as the same information.

In the reception process, the base station 120, 121 demodulates predetermined information transmitted from the terminal according to a synchronization signal provided from the GPS receivers 140, 141, and transmits the received information to the switching center through a transmission path. The currency path is constructed.

Therefore, the same synchronization signal acquisition becomes a very important factor for the CDMA base station to operate normally.

However, among the base stations (120, 121) inevitably has a problem that is operating under difficult conditions to receive from the GPS satellite, for example, the base station installed inside the subway station, the GPS receiver is a feed line and the ground space to receive the GPS satellite signal Only when an antenna is provided, there is a cumbersome problem that a smooth handover can be achieved between a base station inside and outside a subway station.

Accordingly, the present invention has been made to solve the above problems, by supplying a synchronization signal through a transmission path operated by a CDMA base station, and reproduces this synchronization information approximate to the actual synchronization signal, GPS antenna To provide a synchronization signal acquisition device and method therefor, and a computer-readable recording medium recording a program for realizing the synchronization signal and the current time information required for operation without installing the system in the base station. There is this.

1A and 1B are diagrams illustrating a configuration of a base station operation of a conventional CDMA scheme.

2 is an exemplary configuration diagram of an operation of a base station using a CDMA method to which the present invention is applied.

3 is a block diagram of an embodiment of a synchronization signal acquisition apparatus of a base station using a CDMA scheme according to the present invention.

4 is a flowchart illustrating a method for obtaining a synchronization signal of a base station using a CDMA scheme according to the present invention.

5A is a flowchart illustrating an example of a signal processing procedure of the synchronization controller of FIG. 3.

FIG. 5B is an exemplary view illustrating a signal processing flow with time in FIG. 5A. FIG.

FIG. 6A is a flowchart illustrating an example of a signal processing process of a synchronous playback unit of FIG. 3; FIG.

FIG. 6B is an exemplary view illustrating a signal processing flow over time in FIG. 6A; FIG.

Explanation of symbols on the main parts of the drawings

210: switching center 220, 221: base station

230: terminal 240, 241: GPS receiver

250: GPS satellite 260: synchronization control unit

270: synchronous playback unit

In order to achieve the above object, the present invention provides a synchronization signal acquisition apparatus of a base station, and receives periodic and electrical synchronization signals and current time information from a GPS (Global Positioning System) receiving unit, and transmits a bit to a synchronization frame of a transmission path. A synchronization control means for transmitting the delay time information between the synchronization frame of the transmission path and the actual synchronization signal and the transmission delay time information of the transmission round trip or one way and the current time information through the transmission path; And synchronous reproducing means for receiving the synchronous information transmitted from the synchronous control means through a transmission path and predicting a current time and a synchronous pulse of a device requiring a synchronous signal based on the received synchronous information.

In the method for acquiring a synchronization signal of a base station, the present invention receives a periodic electrical synchronization signal and current time information, inserts a bit into a synchronization frame of a transmission path, and synchronizes the synchronization frame of the transmission path with the actual synchronization signal. A first step of transmitting the delay time information, the transmission delay time information of the round trip or one way, and the current time information through the transmission path; A second step of predicting and generating a current time and a synchronization pulse of a device requiring a synchronization signal based on the received synchronization information after receiving the transmitted synchronization information through a transmission path; And a third step of detecting an operation stop doctor or system failure by an operator and performing termination.

In addition, the present invention, in a communication system having a processor, receives a periodic electrical synchronization signal and current time information, inserts bits into a synchronization frame of a transmission path, and synchronizes the synchronization frame of the transmission path with the actual synchronization signal. Transmitting delay time information, transmission delay time information of a round trip or one way, and current time information of a transmission path through a transmission path; A function of predicting and generating a current time and a synchronization pulse of a device requiring a synchronization signal based on the received synchronization information after receiving the transmitted synchronization information through a transmission path; And a computer-readable recording medium having recorded thereon a program for realizing a function of performing shutdown by detecting an operation stop doctor or a system failure of an operator.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

2 is an exemplary configuration diagram of an operation of a base station using a CDMA method to which the present invention is applied, and includes an exchange station 210, a base station 220, 221, a terminal 230, a GPS receiver 240, 241, and a GPS satellite 250. Is done.

3 is a configuration diagram of an apparatus for acquiring a synchronization signal of a base station using a CDMA method according to the present invention, and includes a synchronization controller 260 and a synchronization reproducing unit 270.

The operation of the synchronization signal acquisition apparatus of the base station according to the present invention will be described in detail with reference to FIGS. 2 and 3 as follows.

The GPS receiver 241 located in the switching center 210 receives the same synchronization signal from the GPS receiver 240 located in the base station 221 and transmits the same synchronization signal from the GPS satellite 250 to the switching center 210.

Here, the switching center 210 is composed of a switch 211, a synchronization control unit 260 and a GPS receiver 242 as shown in FIG. 3 to synchronize base stations 220 and 222 without a GPS receiver through a transmission path. Supply the signal.

At this time, the synchronization controller 260 transmits the call information transmitted and received to and from the base station 222 to the switch 211, and synchronizes the synchronization signal specific to the transmission path, delay information necessary for reproducing it, and current time information with the counterpart synchronization playback unit. 270, which is transmitted through a method such as an algorithm to be described later with reference to FIG. 5A.

In addition, the synchronization reproducing unit 270 reproduces the synchronization information provided from the synchronization control unit 260 in the same manner as the algorithm of FIG. 6A, and supplies a synchronization signal to the base station 222 having no GPS receiver. The synchronization control unit 260 and the synchronization reproducing unit 270 perform a function of predicting actual synchronization by measuring a transmission delay time between transmission and reception of mutual synchronization signals in the same manner as feedback.

4 is a flowchart illustrating a method of obtaining a synchronization signal of a base station using a CDMA scheme according to the present invention.

Referring to FIG. 4, a periodic and electrical synchronization signal such as Even Second Pulse or 1PPS (Pulse Per Second) and current time information are received from a GPS receiver, and bits are transmitted to a synchronization frame of a transmission path. In operation 401, delay time information between the synchronization frame of the transmission path and the actual synchronization signal, transmission delay time information of the transmission path round-trip or one-way, and current time information are transmitted through the transmission path.

After receiving the transmitted synchronization information through the transmission path, the current time and the synchronization pulse of the apparatus requiring the synchronization signal are generated based on the received synchronization information (402).

Subsequently, an operation stop doctor or a system failure of the operator is detected through an interception operation (403), and when detected, a shutdown is performed. If the stop doctor or system failure is not detected, synchronization information acquisition and synchronization information transmission process (401) are performed. Go to)

FIG. 5A is a flowchart illustrating a signal processing procedure of the synchronization controller of FIG. 3, and illustrates the synchronization information acquisition and synchronization information transmission procedure of FIG. 4 in detail.

As shown in FIG. 5A, the synchronization controller 260 resets the memory device serving as an internal counting function and, from the GPS receivers 241 and 242 in the standby state, precise standard synchronization such as 1PPS (Pulse Per Second). When the signal is received (501), the transmission delay time until receiving the transmission path synchronization clock generated after receiving the standard synchronization signal is measured (502).

In this way, the reason for measuring the transmission delay time is that, in general, when the transmission is synchronized to the transmission path, the time interval at which transmission is possible is fixed. Therefore, in order to supply an arbitrary synchronization signal to the transmission path, the data input time of the transmission synchronization is determined. It is desirable to wait for the clock signal to inform.

At this time, the synchronization control unit 260 stores the measured transmission delay information in a separate designated memory device, and transmits a transmission path synchronization signal at the same time as a transmission path synchronization clock occurs (503).

On the other hand, since the synchronization reproducing unit 270 is ready to return the transmission synchronization signal received immediately after the transmission synchronization signal is received, the synchronization control unit 260 resets the memory device serving as a count. In operation 504, the transmission delay time until the reciprocating delay synchronizer signal is received is stored and stored in a separate designated memory device.

The synchronization controller 260 sequentially transfers the measured delay time information to the synchronization reproducing unit 270 through the transmission path (505). At this time, the delay information transmitted to the synchronous reproduction unit 270 is a digital signal.

In addition, the synchronization controller 260 transmits current time information (TOD) provided by the GPS receivers 241 and 242 to the synchronization reproducing unit 270 via the transmission path (506).

Subsequently, the synchronization control unit 260 detects the operation stop doctor or system failure occurrence of the operator through an intercept operation (507), and if detected, terminates, and if the operation stop doctor or system failure is not detected, the standard synchronization signal is received. Proceed to step 501.

FIG. 5B is an exemplary view illustrating a signal processing flow according to time described above with reference to FIG. 5A.

6A is a flowchart illustrating a signal processing process of the synchronous reproducing unit of FIG. 3, and illustrates the process of receiving synchronous information and generating predictive synchronous information of FIG. 4.

Referring to FIG. 6A, the synchronization reproducing unit 270 resets a memory device having a time measurement function, maintains a standby state, and electrically or physically recognizes a transmission line synchronization signal transmitted from the synchronization control unit 260 (601). In step 602, the time measurement function is activated and the feedback synchronization signal is retransmitted (602). In this way, the retransmitted feedback sync signal is used for obtaining delay time information required for transmission.

When the retransmission of the feedback synchronization signal is completed, the synchronization reproducing unit 270 receives delay time information including the synchronization delay and the round trip delay information transmitted from the synchronization control unit 260 (603). Here, the received delay time information is a digital value.

Subsequently, the current time information transmitted from the synchronization controller 260 is received (604). In this way, the received time information is transmitted through a transmission path provided separately at the time required by the base station 222 (605).

Then, the coefficient of the time obtained by subtracting the delay value of the transmission one-way of the normal transmission delay time and the transmission delay time from the period of the synchronization signal calculated from the precise reference clock generator provided in the base station 222 or the synchronization reproducing unit 270 is calculated. In operation 606, the synchronization signal is generated and provided to the base station 222, which is predicted at the same time as the activated time measurement value.

Here, the synchronous signal is generated periodically. When the received synchronous signal and delay information required for reception are calculated, the next synchronous signal can be predicted.

In addition, the synchronization reproducing unit 270 calculates a time corresponding to half of the feedback delay time information in the predicted precise synchronization signal, and transmits to the synchronization control unit 260 at each point in time. By calculating the delay time, more precise synchronization can be predicted.

Subsequently, the synchronization reproducing unit 270 detects an operation stop doctor or a system failure of the operator through an interception operation (607), and if it is detected, terminates, and recognizes the synchronization signal if the operation stop doctor or system failure is not detected. Proceed to step 601.

FIG. 6B is an exemplary view illustrating a signal processing flow according to the time described with reference to FIG. 6A.

Although the technical idea of the present invention has been described in detail according to the above preferred embodiment, it should be noted that the above-described embodiment is for the purpose of description and not of limitation. In addition, those skilled in the art will understand that various embodiments are possible within the scope of the technical idea of the present invention.

As described above, the present invention enables synchronization of a CDMA base station that is difficult to receive a GPS signal by allowing a CDMA base station to obtain a synchronization signal and current time information necessary for operation without installing a GPS antenna in the base station. It is possible to supply signals, making it easy to downsize base stations and installation in buildings, and to secure communication stability by supplying a unified synchronization signal from the common GPS of the switching center even when the radio network becomes unstable due to the surrounding environment. It works.

Claims (7)

In the synchronization signal acquisition apparatus of the base station, Receives periodic and electrical synchronization signals and current time information from the GPS (Global Positioning System) receiver, inserts bits into the synchronization frame of the transmission path, delay time information and transmission between the synchronization frame of the transmission path and the actual synchronization signal Synchronization control means for transmitting the transmission delay time information of the round trip or one way and the current time information through the transmission path; And Synchronization reproducing means generated by receiving the synchronization information transmitted from the synchronization control means through a transmission path and predicting the current time and the synchronization pulse of a device requiring the synchronization signal based on the received synchronization information. Apparatus for acquiring a synchronization signal of a base station using a code division multiple access scheme including a. The method of claim 1, Acquisition of the synchronization signal of the base station using the code division multiple access method, characterized in that the synchronization signal received from the GPS receiver is a periodic and electrical signal, such as Even Second Pulse or Pulse Per Second (PPS). Device. In the synchronization signal acquisition method of the base station, Receives periodic and electrical synchronization signals and current time information, inserts bits into the synchronization frame of the transmission path, delay time information between the synchronization frame of the transmission path and the actual synchronization signal, and transmission delay time of the round trip or one way transmission path. A first step of transmitting information and current time information through a transmission path; A second step of predicting and generating a current time and a synchronization pulse of a device requiring a synchronization signal based on the received synchronization information after receiving the transmitted synchronization information through a transmission path; And The third step of detecting shutdown of the operator or system failure and performing shutdown Method of obtaining a synchronization signal of a base station using a code division multiple access scheme made, including. The method of claim 3, wherein The first step is, A fourth step of resetting the memory device serving as an internal coefficient and receiving a precise standard synchronization signal such as 1PPS (Pulse Per Second); A fifth step of measuring a transmission delay time until receiving a transmission path synchronization clock generated after receiving the standard synchronization signal; A sixth step of storing the measured transmission delay information in a separate designated memory device and transmitting a transmission line synchronization signal at the same time as a transmission line synchronization clock is generated; After transmitting the transmission line synchronization signal, the memory device serving as the counting function is reset, the transmission delay time until the reciprocating delay synchronizer signal is received, and the measurement information is stored in a separate designated memory device. Seventh step; An eighth step of sequentially transmitting the measured delay time information through a transmission path; A ninth step of transmitting current time information provided from a global positioning system (GPS) receiver through a transmission path; A tenth step of detecting an operation stop doctor or a system failure of an operator; An eleventh step of performing termination when the operation intention doctor or a system failure is detected in the tenth step; And If the operation stop doctor or system failure is not detected in the tenth step, the twelfth step goes to the fourth step Method of obtaining a synchronization signal of a base station using a code division multiple access scheme made, including. The method of claim 3, wherein The second step, A fourth step of resetting a memory device having a time measurement function and electrically or physically recognizing a transmission path synchronization signal while maintaining a standby state; A fifth step of activating a time measurement function at the moment of recognizing the transmission line synchronization signal and retransmitting a feedback synchronization signal; A sixth step of receiving delay time information including the transmitted synchronization delay and round trip delay information when retransmission of the feedback synchronization signal is completed; A seventh step of receiving the transmitted current time information after receiving the delay time information; An eighth step of transmitting the received current time information through a transmission path separately provided at a time required by the base station; A coefficient of a time obtained by subtracting a delay value of a transmission one-way time from a transmission delay time and a transmission delay time from the period of the synchronization signal transmitted from the base station is calculated, and is estimated at the same time as the time measurement information activated in the fourth step. A ninth step of generating a synchronization signal and providing the synchronization signal to the base station; A tenth step of detecting an operation stop doctor or a system failure of an operator; An eleventh step of performing termination when the operation intention doctor or a system failure is detected in the tenth step; And If the operation stop doctor or system failure is not detected in the tenth step, the twelfth step goes to the fourth step Method of obtaining a synchronization signal of a base station using a code division multiple access scheme made, including. The method according to any one of claims 3 to 5, The third step, A thirteenth step of detecting an operation stop doctor or a system failure of an operator; A fourteenth step of performing termination when an operation stop doctor or a system failure of the operator is detected in the thirteenth step; And A fifteenth step, in which the operation stop doctor or a system failure of the operator is not detected in the thirteenth step, Method of obtaining a synchronization signal of a base station using a code division multiple access scheme made, including. In a communication system having a processor, Receives periodic and electrical synchronization signals and current time information, inserts bits into the synchronization frame of the transmission path, delay time information between the synchronization frame of the transmission path and the actual synchronization signal, and transmission delay time of the round trip or one way transmission path. Transmitting information and current time information through a transmission path; A function of predicting and generating a current time and a synchronization pulse of a device requiring a synchronization signal based on the received synchronization information after receiving the transmitted synchronization information through a transmission path; And Function to perform shutdown by detecting operation stop doctor or system failure A computer-readable recording medium having recorded thereon a program for realizing this.