KR101096110B1 - Cell searching apparatus and cell searching method for automatically managing neighbor lists - Google Patents

Abstract

PURPOSE: A device and a method for searching a call for automatically setting a never list are provided to supply an optimized never list to a communication terminal by automatically generating the never list of a neighboring cell in real time. CONSTITUTION: A system information decoding unit(190) extracts a system parameter by referring a broadcasting channel data extracted from a second receiver. A control unit(170) selectively operates a first cell search mode and a second cell searching mode. The control unit writes a never list based on a system parameter which is extracted from a system information decoding units and neighboring cell information extracted from a first receiver and a second receiver. The control unit transmits the written never list to the communication terminal of the first communication system.

Description

CELL SEARCHING APPARATUS AND CELL SEARCHING METHOD FOR AUTOMATICALLY MANAGING NEIGHBOR LISTS}

The present invention relates to a cell search apparatus and a cell search method for automatically setting a neighbor list, and more particularly, to a cell search apparatus and a cell search method for automatically setting a neighbor list by searching for neighboring cells using wireless search.

As a method for managing neighbor lists in a mobile communication system, a method in which an operator presets a neighbor list for a base station in a neighbor list management server is generally used. However, the above method has a disadvantage in that the management of an operator is required when the neighboring cell of the base station is changed or the base station is moved, and it is difficult to optimize the neighbor list when the output of the neighboring cell is changed.

Alternatively, a method of identifying neighbor cell information using a handover and other statistical information and managing a neighbor list using the handover and other statistical information is also used. However, this method has a disadvantage in that it is not possible to manage the neighbor list when there is no statistical information or when statistics are not collected.

On the other hand, the management method for the Inter-RAT neighbor list in the mobile communication system is commonly used by the operator to set in advance. However, this method has a disadvantage in that the mobile communication service provider cannot obtain an accurate neighbor list when they are different.

The present invention was devised to solve the above problems, and automatically searches for information on all the cells in the vicinity using the WCDMA / GSM mobile communication method through a wireless method, and automatically searches the neighbor list of neighboring cells in real time. It is an object of the present invention to provide a cell search apparatus and a cell search method for generating an optimized neighbor list to a communication terminal.

Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. Also, it will be readily appreciated that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

According to an aspect of the present invention for achieving the above object, a cell search apparatus mounted on a first communication system base station to generate a neighbor list using a wireless search, operating in a first cell search mode, A first receiver for extracting neighboring cell information by separating a specific frequency signal from a frequency band of the first communication system; First system parameter extracting means for operating in a first cell search mode and extracting system parameters with reference to neighboring cell information extracted by the first receiver; A second receiver operating in a second cell search mode and extracting neighboring cell information by separating a specific frequency signal from a frequency band of a second communication system of the surrounding radio signal; Second system parameter extracting means for operating in a second cell search mode and extracting system parameters with reference to neighboring cell information extracted from the second receiver; And selectively operating the first cell search mode and the second cell search mode, and based on neighbor cell information extracted from the first and second receivers and system parameters extracted from the first and second system parameter extracting means. Control means for creating a list and transmitting it to a communication terminal of the first communication system.

The cell search apparatus may further include switching means for branching a peripheral radio signal received at the first communication system base station to either the first receiver or the second receiver according to a cell search mode control of the control means. Can be.

In this case, the switching means may couple the signal between the system receiver and the duplexer of the first communication system base station and branch to either the first receiver or the second receiver, or the switching means is the first 1 is directly connected between the system receiver and the duplexer of the communication system base station can branch the signal transmitted from the duplexer to the system receiver to either the first receiver or the second receiver.

When the switching means is directly connected between the system receiver and the duplexer of the first communication system base station, the operating frequency of the system receiver of the first communication system base station and the operating frequencies of the first and second receivers are preferably synchronized.

Meanwhile, the control unit aligns neighbor cell information and system parameters based on received signal strength so that neighbor cell information and system parameters of the first communication system having the same frequency as the transmission frequency of the first communication system base station are Intra-Frequency. In addition to neighbor list, neighboring cell information and system parameters of a frequency different from the transmission frequency of the first communication system base station are added to the Inter-Frequency neighbor list, and neighboring cell information and system parameters of the second communication system are Inter-RAT. Add to NAVER list.

The control means may encode and insert the neighbor list into a cell info list of a system information block (SIB) 11 and transmit it to the communication terminal.

Further, the first and second receivers extract broadcast channel data from a specific frequency signal, and the first and second system parameter extracting means refer to the broadcast channel data extracted from the first and second receivers, respectively, and system parameters. Can be extracted.

According to another aspect of the present invention for achieving the above object, a cell search method for generating a neighbor list using a radio search in a cell search apparatus mounted in a base station of a first communication system includes: (a) setting a first cell search mode; Extracting neighboring cell information by separating a service frequency signal from a first communication system frequency band of the surrounding wireless signal; (b) extracting a system parameter by referring to the neighbor cell information extracted in step (a); (c) adding neighbor cell information and system parameters extracted in steps (a) and (b) to the neighbor list; (d) setting a second cell search mode and extracting neighboring cell information by separating a service frequency signal from a second communication system frequency band of the surrounding wireless signal; (e) extracting system parameters by referring to the neighboring cell information extracted in step (d); And (f) adding the neighboring cell information and the system parameters extracted in the steps (d) and (e) to the neighbor list.

In this case, the step (c) may include: aligning the extracted neighbor cell information and system parameters with respect to a received signal strength; Adding neighbor cell information and system parameters of a first communication system having a frequency equal to a transmission frequency of the first communication system base station to an intra-frequency neighbor list; And adding neighboring cell information and system parameters of a frequency different from the transmission frequency of the first communication system base station to the Inter-Frequency neighbor list.

Also, in the step (f), neighboring cell information and system parameters of the second communication system may be added to the Inter-RAT neighbor list by sorting the received signal strength.

The cell searching method may further include encoding and inserting a neighbor list into a cell info list of a system information block (SIB) 11 of a first communication system and transmitting the encoded list to a communication terminal. can do.

In addition, the steps (b) and (e) may detect and extract broadcast channel data using cell identification information included in neighboring cell information, and extract system parameters by referring to the extracted broadcast channel data. Can be.

The present invention as described above, by changing the neighbor list in real time in response to changes in the wireless environment of the neighboring cell to be applied to the communication terminal to respond to changes in the wireless environment in real time.

In addition, the present invention may optimize the neighbor list according to the wireless environment by managing the neighbor list based on signal strength and the like through searching for neighboring cell signals.

In addition, in the present invention, there is no separate server for managing the neighbor list, and the base station automatically manages the neighbor list of neighbor cells, thereby simplifying the system installation procedure and reducing the cost of server construction and maintenance management.

In addition, the present invention does not manage the setting of the Naver list by the operator, there is no operator's involvement in the setting of the Naver list, and when the Naver list of the service area is changed, it automatically detects this and automatically updates the Naver list to more precisely. Enable Naver List Management.

1 is a diagram illustrating a configuration of a cell search apparatus according to an embodiment of the present invention.
2 is a diagram illustrating a configuration of a cell search apparatus according to another embodiment of the present invention.
3 is a signal flow diagram illustrating a process of searching for a cell of a specific frequency signal of a WCDMA system in the cell search apparatus of FIG. 1.
4 is a signal flow diagram illustrating a cell search process for a specific frequency signal of a GSM system in the cell search apparatus of FIG. 1.
5 is a flowchart illustrating a method of optimizing a neighbor list according to an embodiment of the present invention.

The foregoing and other objects, features and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings, in which: There will be. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating a configuration of a cell search apparatus according to an embodiment of the present invention. The cell search apparatus according to the present invention is mounted in a base station and searches for neighboring cells of the base station. 1, reference numeral 100 denotes a configuration of a base station and includes an antenna, a duplexer, a base station system receiver, and a base station system transmitter.

As shown in FIG. 1, the cell search apparatus according to the present embodiment includes a switch 110, a WCDMA bandpass filter 120, a GSM bandpass filter 130, a WCDMA receiver 140, and a GSM receiver 150. , An oscillator 160, a controller 170, and a system information decoder 180, 190.

When the WCDMA / GSM radio signal received from the antenna is received through the duplexer, the switch 110 transmits the received radio signal under the control of the controller 170 to the WCDMA receiver 140 or the GSM receiver 150. To pass. The switch 110 couples and branches signals transmitted from the duplexer to the base station receiver without being directly connected to the duplexer.

The WCDMA bandpass filter 120 filters the WCDMA signal band from the signal transmitted from the switch 110 and outputs the WCDMA signal to the WCDMA receiver 140, and the GSM bandpass filter 130 transmits the switch from the switch 110. The GSM signal band is filtered from the signal to be output to the GSM receiver 150.

The WCDMA receiver 140 processes a signal output from the WCDMA bandpass filter 120, and is provided with a SAW filter for distinguishing each frequency signal band, and as illustrated in FIG. 1, a cell search unit ( 141 and a BCH decoding unit 143.

The cell search unit 141 performs a search for all cells using a specific frequency signal by using the signal output from the WCDMA bandpass filter 120 under the control of the controller 170 and retrieves the found cell information. Transfer to the controller 170. The cell search unit 141 is synchronized with the oscillator 160 to set an operating frequency in a specific frequency band. The cell information searched by the cell search unit 141 includes a UTRA Carrier Receive Signal Strength Indicator (RSSI), the number of searched cells, a system frame number (SFN), a primary scramble code index, and a CPICH RSCP ( Receive Signal Code Power). The cell search unit 141 may check the number of cells based on the primary scrambling code index.

The BCH (Broadcast CHannel) decoding unit 143 sets a synchronization with a radio signal based on the primary scrambling code of the cells searched by the cell search unit 141 under the control of the controller 170, The transport block of the broadcast channel (BCH) is extracted, decoded, and transmitted to the controller 170 along with a cyclic re-dunduncy check (CRC) value.

The system information decoding unit 180 extracts a system parameter from the BCH transport block by referring to the BCH transport block detected by the BCH decoding unit 143 under the control of the control unit 170, and then transfers the system parameter to the control unit 170. To pass. The system parameters analyzed by the system information decoding unit 180 may include a Master Information Block (MIB) including a Public Land Mobile Network (PLMN) Type & ID, a Mobile Country Code (MCC), a Mobile Network Code (MCC), and a LAC ( System Information Block (SIB1) including Local Area Code (SIB1), Routing Area Code (RAC), System Information Block (SIB5) including PICH Power Offset, and AICH Power Offset.

Meanwhile, the GSM receiver 150 processes the signal output from the GSM bandpass filter 130, and is similarly provided with a SAW filter for distinguishing each frequency signal band, as shown in FIG. 1. The search unit 151 and the BCCH decoding unit 153 are included.

The cell search unit 151 performs a search for all cells using a specific frequency signal by using the signal output from the GSM bandpass filter 120 under the control of the controller 170 and retrieves the found cell information. Transfer to the controller 170. The cell information searched by the cell search unit 151 includes Carrier Frequency RSSI, the number of searched cells, NCC (Network Color Code), BCC (BS Color Code), and RFN (Reduced TDMA Frame Number). The cell search unit 151 may check the number of cells based on the BCC.

The Broadcast Control CHannel (BCCH) decoding unit 153 sets a synchronization with a radio signal based on the BCC (BS Color Code) of the cells searched by the cell search unit 141 under the control of the controller 170. The BCCH data block is extracted from the radio signal, decoded, and transmitted to the controller 170 along with a cyclic re-dunduncy check (CRC) value.

The system information decoding unit 190 extracts a system parameter from the BCCH data block by referring to the BCCH data block detected by the BCCH decoding unit 153 and transmits the system parameter to the control unit 170 under the control of the control unit 170. . The system parameters analyzed by the system information decoding unit 190 include Public Land Mobile Network (PLMN) ID, Local Area Code (LAC), Base Station Identity Code (BSIC), Band Indicator, and Broadcast Control Channel Absolute Radio Frequency (BCCH ARFCN). Channel Number).

The controller 170 controls the overall operation of the cell search apparatus. Specifically, the controller 170 controls the switch 110 according to the cell search mode, and controls the search frequency of the cell search unit 141 of the WCDMA receiver 140 and the cell search unit 151 of the GSM receiver 150. The controller requests cell search to each cell search unit 141 or 151 and receives cell search information accordingly. In addition, the controller 170 requests the BCH decoding unit 143 and the BCCH decoding unit 153 to decode the data of the BCH / BCCH and receives the result thereof, and according to the received result, the system information decoding unit ( 180 and 190 are controlled to obtain system parameters of neighboring cells. In addition, the controller 170 processes the sorting algorithm of the neighbor list based on the signal strength of neighboring cells based on the cell search result. The alignment algorithm will be described later with reference to FIG. 5.

The controller 170 controls the switch 110 to the WCDMA receiver 140 side for the operation of the WCDMA cell search mode, and also controls the WCDMA receiver 140 and the system information decoding unit 180. In addition, the controller 170 controls the switch 110 to the GSM receiver 150 side for the operation of the GSM cell search mode, and also controls the GSM receiver 150 and the system information decoding unit 190.

FIG. 2 is a diagram illustrating a configuration of a cell search apparatus according to another embodiment of the present invention, in which the cell search apparatus and the components described with reference to FIG. 1 are the same. However, the switch 110 of the cell search apparatus described with reference to FIG. 1 is not directly connected to the duplexer of the base station, but is coupled to a signal path transmitted from the duplexer to the system receiver to branch the signal. The switch 110 of is directly connected between the duplexer of the base station and the system receiver to directly branch the signal received by the base station.

The cell search apparatus described with reference to FIG. 1 does not affect the service of the base station even if it is mounted in the base station. The cell search apparatus of FIG. 1 synchronizes the frequency to be searched by the oscillator 160 by itself, but the cell search apparatus of FIG. 2 operates at the same frequency as the base station. Accordingly, the base station equipped with the cell search apparatus of FIG. 2 cannot provide a cell search function and a communication service at the same time, and performs one of the cell search function and the communication service.

As shown in FIG. 2, the cell search units 141 and 151 of the cell search apparatus are frequency synchronized with the system receiver of the base station. When performing a cell search in a frequency band different from that of the base station, the base station does not provide a communication service, and the switch 110 does not branch the signal received from the duplexer to the base station system receiver under the control of the controller 170. Branch to the WCDMA bandpass filter 120 or the GSM bandpass filter 130. At this time, the cell search frequency is controlled by the controller 170.

3 is a signal flow diagram illustrating a process of searching for a cell of a specific frequency signal of a WCDMA system in the cell search apparatus of FIG. 1.

Referring to FIG. 3, the controller 170 sets the frequency signal information of the WCDMA receiver 140 to tune to the WCDMA frequency signal to be searched, and then controls the switch 110 to the WCDMA receiver 140 to control the cell search unit 141. In step S301, transmission signals of neighboring cells are received.

Next, the controller 170 transmits a cell searching request message to the cell search unit 141 to search for all primary scramble codes (S303).

The cell search unit 141 receiving the cell search request message sequentially searches from the primary scramble codes 0 to 511, searches for neighbor cells, and includes cell search response messages including information about the searched neighbor cells. Response) is transmitted to the controller 170 (S305). The cell search response message includes cell information including UTRA Carrier Receive Signal Strength Indicator (RSSI), number of cells searched, System Frame Number (SFN), Primary Scramble Code Index, and CPICH Receive Signal. Code Power).

The controller 170 receiving the cell discovery response message extracts a primary scramble code index from the cell discovery response message and sends a BCH decoding request message (BCH decoding request) including the primary scramble code index to the BCH decoding unit ( In step 307, the BCH transport block is requested to be decoded. When the cell search response message includes a plurality of primary scramble code indices, it means that there are a plurality of cells of a specific frequency, and the controller 170 selects any one of the primary scramble code indices to request BCH decoding. The message is transferred to the BCH decoding unit 143 in the message.

The BCH decoding unit 143 detects and decodes the BCH transport block based on the primary scramble code index included in the BCH decoding request message, and transfers the BCH decoding response message along with the CRC to the controller 170 (S309). ).

Upon receiving the BCH decoding response message, the controller 170 requests the system information decoding unit 180 to detect a system parameter by using the BCH transport block included in the BCH decoding response message. That is, the controller 170 transmits a system information decoding request message including the BCH transport block to the system information decoding unit 180 (S311).

The system information decoding unit 180 decodes the parameters of the master information block MIB and the system information block SIB based on the BCH transport block included in the system information decoding request message and transmits the decoded parameters to the controller 170. The system information decoding unit 180 loads the parameters of the master information block MIB and the system information block SIB in the system information decoding response message and transmits the parameters to the control unit 170 (S313).

As such, the controller 170 receiving the system parameter from the system information decoding unit 180 repeats the steps S307 to S313 for each cell when the number of cells searched in the step S305 is two or more. (S315).

4 is a signal flow diagram illustrating a cell search process for a specific frequency signal of a GSM system in the cell search apparatus of FIG. 1.

Referring to FIG. 4, the controller 170 sets the frequency signal information of the GSM receiver 150 to tune to the GSM frequency signal to be searched, and then sets the switch 110 to the GSM receiver 140 after setting the frequency signal information. In operation S401, the cell search unit 151 receives a transmission signal of a neighbor cell.

Next, the control unit 170 transmits a cell searching request message to the cell search unit 151 (S403).

Upon receiving the cell search request message, the cell search unit 151 searches for neighbor cells and transmits a cell search response message including information on the searched neighbor cells to the controller 170 (S405). ). The cell search response message includes Carrier Frequency RSSI, the number of cells searched, Network Color Code (NCC), BS Color Code (BCC), and Reduced TDMA Frame Number (RFN) as cell information.

Upon receiving the cell discovery response message, the controller 170 extracts the BCC included in the cell discovery response message and transfers the BCCH decoding request message including the extracted BCC to the BCCH decoding unit 153. Request decoding of the BCCH data block (S407).

The BCCH decoding unit 153 detects and decodes the BCCH data block based on the BCC included in the BCCH decoding request message and loads the BCCH decoding response message along with the CRC to the control unit 170 in operation S409.

Upon receiving the BCCH decoding response message, the controller 170 requests the system information decoding unit 190 to detect the system parameter using the BCCH data block included in the BCCH decoding response message. That is, the controller 170 transmits a system information decoding request message including the BCCH data block to the system information decoding unit 190 (S411).

The system information decoding unit 190 decodes the system parameter based on the BCCH data block included in the system information decoding request message and transmits the system parameter to the control unit 170. The system information decoding unit 190 loads the system parameter in the system information decoding response message and transmits the system parameter to the control unit 170 (S413). The system parameter may include a Public Land Mobile Network (PLMN) ID, a Local Area Code (LAC), a Base Station Identity Code (BSIC), a Band Indicator, and a Broadcast Control Channel Absolute Radio Frequency Channel Number (BCCH).

As such, the control unit 170 receiving the system parameter from the system information decoding unit 190 repeats the steps S407 to S413 for each cell when the number of cells searched in the step S405 is two or more. (S415).

5 is a flowchart illustrating a method of optimizing a neighbor list according to an embodiment of the present invention. The embodiment referring to FIG. 5 assumes that a base station equipped with a cell search apparatus provides a WCDMA communication service.

As shown in FIG. 5, first, the control unit 170 of the cell search apparatus performs cell search on all frequency bands or preset frequency bands that can be serviced in the WCDMA mobile communication system (S501). . The process of acquiring the cell search result is as described with reference to FIG. 3.

After cell searching for all serviceable frequency bands, the controller 170 checks whether each of the found cells is valid (S503). For example, a cell of another mobile carrier using the same frequency signal band (when the PLMN ID of the master information block (MIB) is not a predetermined value) or a cell of a predefined non-serviceable frequency band is invalid. To judge. The search result of the invalid cell is removed (S505).

In this way, after checking the validity of each cell searched for all frequency bands, the information of the valid cells is sorted according to the strength of the received signal (S507). The criterion of sorting according to the strength of the received signal is that the values of CPICH RSCP are sorted in ascending order, or that the values of CPICH Ec / No (= (CPICH RSCP) / (URTA RSSI)) are sorted in order of increasing magnitude.

After sorting the information of the cells according to the strength of the received signal as described above, the cell information is added to the WCDMA neighbor list. That is, the controller 170 checks the frequency information of each sorted cell (S509), so that the information of cells having the same frequency as the transmission frequency of the current WCDMA system base station is Intra-Frequency Neighbor Lists. (S511), cells having a frequency different from that of the WCDMA system base station are added to the Inter-Frequency Neighbor Lists (S513).

After searching for neighbor cells of the WCDMA system and adding them to the neighbor list, the control unit 170 of the cell search apparatus performs a cell search function of the frequency signal band of the GSM system to perform all frequency bands or services available in the GSM system. Cell search information is acquired for the set frequency band (S515). The process of acquiring the cell search result is as described with reference to FIG. 4.

After cell searching for all serviceable frequency bands, the controller 170 checks whether each of the found cells is valid (S517). For example, it is determined that a cell in which Inter-RAT handover is impossible (a cell that does not satisfy a predetermined PLMN ID) or a cell in a predefined non-serviceable frequency band is invalid. The search result of the invalid cell is removed (S519).

After checking the validity of each of the cells searched as described above, the controller 170 sorts the information of the valid cells according to the strength of the received signal (S521). At this time, the strength of the received signal is based on the Carrier Frequency RSSI. The controller 170 adds the sorted cells information to the Inter-RAT neighbor list (S523). Since the base station on which the cell search apparatus is currently mounted is a base station of the WCDMA system, the controller 170 adds information of cells of the GSM system to the Inter-RAT neighbor list.

After adding the neighbor cells of the WCDMA system and neighbor cells of the GSM system to the neighbor list as described above, the controller 170 transmits the system information including all neighbor lists to the communication terminal located in the corresponding WCDMA system base station ( S525). Preferably, the controller 170 encodes and inserts the Inter-Frequency neighbor list, the Intra-Frequency neighbor list, and the Inter-RAT neighbor list in the cell information list of the SIB 11.

The cell search apparatus periodically repeats the process described with reference to FIG. 5. Therefore, when the neighbor cells of the WCDMA system and the GSM system are changed or disappeared, and when the strength of the received signal is changed, the neighbor list is updated and transmitted to the communication terminal.

The process of storing the method according to the present invention on a recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.) can be easily carried out by those skilled in the art. Therefore, it will not be described in detail any more.

While the specification contains many features, such features should not be construed as limiting the scope of the invention or the scope of the claims. Also, the features described in the individual embodiments herein can be implemented in combination in a single embodiment. Conversely, various features described herein in a single embodiment may be implemented in various embodiments individually or in a suitable subcombination.

It is to be understood that, although the operations have been described in a particular order in the figures, it should be understood that such operations are performed in a particular order as shown, or that a series of sequential orders, or all described operations, . In some circumstances, multitasking and parallel processing may be advantageous. In addition, it should be understood that the division of various system components in the above-described embodiments does not require such division in all embodiments. The above-described program components and systems can generally be implemented as a single software product or as a package in multiple software products.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited by the drawings.

101: switch 120: WCDMA bandpass filter
130: GSM bandpass filter 140: WCDMA receiver
150: GSM receiver 170: control unit
180, 190: system information decoding unit

Claims (13)

A cell search apparatus mounted on a first communication system base station and generating a neighbor list using wireless search,
A first receiver operating in a first cell search mode, the first receiver separating a specific frequency signal in a first communication system frequency band of a surrounding radio signal and extracting neighboring cell information including broadcast channel data from the specific frequency signal;
First system parameter extracting means for operating in a first cell search mode and extracting system parameters by referring to broadcast channel data extracted by the first receiver;
A second receiver operating in a second cell search mode, the second receiver separating a specific frequency signal in a frequency band of a second communication system of the surrounding wireless signal and extracting neighboring cell information including broadcast channel data from the specific frequency signal;
Second system parameter extracting means for operating in a second cell search mode and extracting system parameters with reference to broadcast channel data extracted from the second receiver; And
Selectively operating the first cell search mode and the second cell search mode and based on neighbor cell information extracted from the first and second receivers and a system parameter extracted from the first and second system parameter extracting means; And control means for creating a transmission to a communication terminal of the first communication system. The method of claim 1,
And switching means for branching a peripheral radio signal received at the first communication system base station to either the first receiver or the second receiver according to a cell search mode control of the control means. The method of claim 2,
The switching means,
And branching to either the first receiver or the second receiver by coupling a signal between a system receiver and a duplexer of the first communication system base station. The method of claim 2,
The switching means,
And a signal connected directly between a system receiver and a duplexer of the first communication system base station to branch a signal transmitted from the duplexer to the system receiver to either the first receiver or the second receiver. The method of claim 4, wherein
And an operating frequency of a system receiver of the first communication system base station and an operating frequency of the first and second receivers. 6. The method according to any one of claims 1 to 5,
Wherein,
The neighbor cell information and system parameters are sorted based on the received signal strength so that the neighbor cell information and system parameters of the first communication system having the same frequency as the transmission frequency of the first communication system base station are added to the Intra-Frequency neighbor list. The neighboring cell information and system parameters of a frequency different from the transmission frequency of the first communication system base station are added to the Inter-Frequency neighbor list, and the neighboring cell information and system parameters of the second communication system are added to the Inter-RAT neighbor list. Cell navigation device. The method according to claim 6,
Wherein,
And a neighbor list is encoded and inserted into a cell info list of a system information block (SIB) 11 and transmitted to a communication terminal. delete A cell search method for generating a neighbor list using wireless search in a cell search apparatus mounted in a base station of a first communication system,
(a) setting a first cell search mode and extracting neighboring cell information including broadcast channel data by separating a service frequency signal from a first communication system frequency band of the surrounding wireless signal;
(b) extracting system parameters with reference to the broadcast channel data extracted in step (a);
(c) adding neighbor cell information and system parameters extracted in steps (a) and (b) to the neighbor list;
(d) setting a second cell search mode and extracting neighboring cell information including broadcast channel data by separating a service frequency signal from a second communication system frequency band of the surrounding wireless signal;
(e) extracting system parameters with reference to the broadcast channel data extracted in step (d); And
(f) adding neighbor cell information and system parameters extracted in the steps (d) and (e) to the neighbor list. The method of claim 9,
In step (c),
Arranging the extracted neighbor cell information and system parameters based on a received signal strength;
Adding neighbor cell information and system parameters of a first communication system having a frequency equal to a transmission frequency of the first communication system base station to an intra-frequency neighbor list; And
And adding neighboring cell information and system parameters of a frequency different from the transmission frequency of the first communication system base station to an Inter-Frequency neighbor list. The method according to claim 9 or 10,
The step (f)
The neighbor cell information and system parameters of the second communication system are added to the Inter-RAT neighbor list by sorting the received signal strength. The method of claim 11,
Encoding and inserting a neighbor list into a cell info list of a system information block (SIB) 11 of a first communication system and transmitting the encoded list to a communication terminal; Way. delete

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