KR20090092425A - Apparatus and method for verifying neighbor list in wireless communication system - Google Patents

Abstract

The present invention relates to a neighbor list verification apparatus and method in a wireless communication system. According to an embodiment of the present invention, when a signal strength of a serving base station satisfies a predetermined condition, a process of allocating a scan section for full search and a process of performing a full search during the allocated scan section are performed. And comparing the full search result with a neighbor list currently owned, and transmitting a report message including a missing base station list to the serving base station when there is a neighboring base station missing from the neighbor list. .

Description

Apparatus and method for verifying NAVER list in wireless communication system {APPARATUS AND METHOD FOR VERIFYING NEIGHBOR LIST IN WIRELESS COMMUNICATION SYSTEM}

The present invention relates to an apparatus and method for constructing a neighbor base station list in a wireless communication system, and more particularly, to an apparatus and method for verifying and reconstructing a neighbor base station list.

Today, many wireless communication technologies have been proposed as candidates for high speed mobile communication. Among them, orthogonal frequency division multiplexing (OFDM) is recognized as the most powerful next generation wireless communication technology. The OFDM technology is expected to be used in most wireless communication technologies in the future, and the OFDM technology is also adopted as a standard in the IEEE 802.16 series Wireless Metropolitan Area Network (WMAN).

On the other hand, the cellular based mobile communication system supports handover (handover) to provide a seamless service to the terminal. The handover is a technology for transferring a connection established between a previous base station and a terminal to a new base station when a mobile terminal moves from one base station area (cell area) to an adjacent base station area. The handover is also supported in an OFDM-based broadband wireless communication system.

In the broadband wireless communication system, an active mode terminal receives a Mobile Neighbor Advertisement (MOB_NBR_ADV) message broadcast from a base station, and obtains neighbor base station information (neighbor list) from the neighbor advertisement message. Here, the neighbor advertisement message, the number of neighboring base stations, for each neighboring base station, physical layer profile information, FA (Frequency Allocation) index, transmit power value (EIRP: fficient Isotropic Radiation Power), base station identifier (BSID: Base Station) IDentification, preamble index / subchannel index, handover procedure optimization (HO process optimization) information, supported scheduling service, DCD CCD (Downlink Channel Descriptor Configuration Change Count), UCD (Uplink Channel Descriptor) CCC, etc. may be included. .

Meanwhile, the terminal scans neighbor base stations using the obtained neighbor base station information and performs a handover procedure by exchanging handover related signaling with a serving base station when the handover condition is satisfied as a result of the scanning.

That is, the terminal should always be able to measure the signal strength of neighboring base stations in the vicinity of the serving cell (serving base station), and the information of the neighbor base stations (preamble index, etc.) from the neighbor advertisement message periodically broadcasted from the serving base station. Obtained. That is, neighboring base stations not included in the NAVER advertisement message cannot be scanned (or monitored) themselves.

If the most appropriate handover target cell at the current position of the terminal is not included in the neighbor advertisement message, the terminal cannot monitor (receive strength measurement) itself on the target cell, and thus the terminal needs handover. Nevertheless, it leaves the serving cell without a handover procedure. In this case, the call of the terminal (100%) (call drop) problem occurs.

In a real commercial network, call drop occurs frequently due to missing neighbor list for a target cell. When the call is dropped, the terminal acquires the base station (target base station) having the largest reception strength through full search and attempts initial entry to the base station. In general, when a call drop occurs, it is difficult to find that the neighbor list is missing because the base station determines that the call is a simple call drop and the terminal determines that the radio environment is bad. In other words, the Naver list omission causes 100% call drop, so it is necessary to find a problem section early.

Accordingly, an object of the present invention is to provide an apparatus and method for verifying a neighbor list in a wireless communication system.

Another object of the present invention is to provide an apparatus and method for verifying a neighbor list using a scanning result of a terminal in a wireless communication system.

Still another object of the present invention is to provide an apparatus and method for reconfiguring a neighbor list by using a scanning result of a terminal in a wireless communication system.

Another object of the present invention is to provide an apparatus and a method for a terminal to report neighbor base station information missing from a neighbor list to a serving base station in a wireless communication system.

Another object of the present invention is to provide an apparatus and method for reconfiguring a neighbor list by using missing neighbor base station information reported from a terminal in a wireless communication system.

According to an aspect of the present invention for achieving the above object, in a method of operating a terminal in a wireless communication system, if the signal strength of the serving base station satisfies a predetermined condition, a scan interval for full search is allocated. A process of performing a full search during the allocated scan interval, comparing the full search result with a neighboring neighbor list, and if there is a neighboring base station missing from the neighbor list, And transmitting a report message including the report message to the serving base station.

According to another aspect of the present invention, a method of operating a base station in a wireless communication system, the method comprising: periodically transmitting a neighbor advertisement message including a neighbor list, allocating a scan interval to the terminal requesting a full search, And receiving a report message including the missing base station list from the terminal, and transmitting an alarm message including the missing base station list to a system manager.

According to still another aspect of the present invention, in a method for verifying a neighbor list in a wireless communication system, when a specific event occurs, a process of performing a full search by allocating a scan section for a full search, and the terminal; Comparing the full search result with a neighbor list received from a serving base station, determining a missing base station in a neighbor list, transmitting, by the terminal, the determined missing base station list to the serving base station; The serving base station includes the step of transmitting the missing base station list to a system manager.

According to still another aspect of the present invention, in a terminal device in a wireless communication system, when a signal strength of a serving base station satisfies a predetermined condition, a scan section for full search is allocated, and during the allocated scan section, Comparing a search unit performing a full search with a search result from the search unit and a neighbor list currently held, and generating a report message including a missing base station list when a neighbor base station is missing from the neighbor list. And a control unit and a transmission unit for physically processing the report message from the control unit and transmitting the same to the serving base station.

As described above, the present invention proposes a method for automatically verifying a neighbor list, and thus, there is an advantage in that a call drop due to a missing neighbor list can be eliminated.

1 is a diagram illustrating a network configuration according to an embodiment of the present invention.

2 is a diagram illustrating an operation procedure of a terminal in a wireless communication system according to an embodiment of the present invention.

3 is a diagram illustrating an operation procedure of a base station in a wireless communication system according to an embodiment of the present invention.

4 is a diagram illustrating an operation procedure of a system manager in a wireless communication system according to an embodiment of the present invention.

5 is a diagram illustrating a signal exchange procedure according to neighbor list verification and update in a wireless communication system according to an embodiment of the present invention.

6 is a diagram illustrating a configuration of a terminal in a wireless communication system according to an embodiment of the present invention.

Hereinafter, the operating principle of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, detailed descriptions of well-known functions or configurations will be omitted if it is determined that the detailed description of the present invention may unnecessarily obscure the subject matter of the present invention. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification.

Hereinafter, the present invention looks at a method for verifying a neighbor list in a wireless communication system.

Hereinafter, the present invention will be described using an orthogonal frequency division multiplexing (OFDM) / orthogonal frequency division multiple access (OFDMA) based wireless communication system as an example, and the present invention can be easily applied to other wireless communication systems using other access methods. .

In addition, in the following description, the name of a network entity (NE: Network entity) is defined according to a corresponding function, and may vary according to the intention of the standardization group and the operator. For example, the base station may be called an access point (AP), a radio access station (RAS), a node-B, or a base station (BS). In addition, the base station controller may be referred to as a radio network controller (RNC), a base station controller (BSC), an access control router (ACR), or an access service network gateway (ASN-GW).

1 illustrates a network configuration according to an embodiment of the present invention.

As shown, a mobile station (MS) 110, a radio access station (RAS) 120, an access control router (ACR) 130, and a policy server 140 , AAA (Authentication, Authorization, Accounting) server 150 and system manager 160 is configured to include. Here, the network composed of the base station 120 and the control station 130 may be defined as an access service network (ASN). In addition, the system manager 160 is a WiBro System Manager (WSM), Element Management System (EMS). It may be called OMC (Operating and Maintenance Center). The policy server 140 may be configured as a separate server as shown, or may be mounted as a function in another network entity as another example.

Referring to FIG. 1, first, the AAA server 150 performs authentication and charging for a terminal in cooperation with the control station 130. The policy server 140 provides policy information (eg, QoS policy information) determined by an operator (or an operator) to a corresponding network entity.

The system manager 160 transmits information related to a network configuration to the ASN, and manages the control station 130 and the base station 120 configuring the ASN. Here, the system manager 160 transmits the neighbor list input by the operator to the corresponding ASN to the operator station (or terminal). Between the system manager 160 and the ASN, a common open policy service (COPS) or a radius or diameter interface may be used.

The control station 130 transmits the traffic from the core network to the base station 120, and transmits the traffic from the base station 120 to the core network. In this case, the control station 130 manages a service flow (SF), a connection, and mobility for each terminal. Here, a unique service flow (SF) is generated for each uplink and downlink connection.

The base station 120 transmits the traffic from the control station 130 to the terminal 110, and transmits the traffic from the terminal 110 to the control station 130. Here, the base station 120 is connected to the control station 130 by wire and wirelessly connected to the terminal 110. The base station 120 allocates resources to the terminal 110 by performing scheduling based on a media access control (MAC) layer quality of service (QoS). The network between the control station 130 and the base station 120 may be configured as L2 (layer 2: ethernet) network or L3 (layer 3: IP) network as shown.

Although not shown in FIG. 1, network entities for allocating an IP address to a terminal (DH for simple IP, HA and FA for mobile IP), and a network entity name (NAI: Network Access Identifier) and an IP address It is obvious that a DNS (Domain Name Server) server, etc., which manages the mapping relationship of the server is configured.

Looking at the operation of the present invention based on the configuration of Figure 1 as follows.

The base station 120 receives a neighbor list from the system manager 160. In general, the neighbor list may be delivered to the base station 120 when the base station 120 is initially set up or when a specific event (a neighbor list update) occurs. The neighbor list includes information (physical layer profile information, FA index, EIRP value, BSID, preamble index / subchannel index, handover procedure optimization information, support scheduling) for each of the neighbor base stations neighboring the base station 120. Service, DCD CCC, UCD CCC, etc.).

The base station 120 generates a broadcast message (eg, NBR-ADV message) including a neighbor list from the system manager 160 and broadcasts it at a set period. Meanwhile, the terminal 110 scans an adjacent base station by using the NBR-ADV message from the base station 120 and determines a base station to be handed over using the scanning result. In addition, according to the present invention, the terminal 110 searches (or scans) all base stations (all preamble indexes) according to a specific event, and compares the scanning result with a neighbor list received from the base station 120. In this case, when there is a neighboring base station missing in the neighbor list, the terminal 110 reports the missing neighbor base station to the base station 120.

When the neighbor base station missing from the terminal 110 is reported, the base station 102 may update the neighbor list using the reported information, or report the missing neighbor base station to the system manager 160. . Then, the system manager 160 verifies a preset neighbor list by using the missing neighbor base station information, and reconfigures the neighbor list and transfers the neighbor list to the corresponding base station when it is necessary to reconfigure the neighbor list.

2 illustrates an operation procedure of a terminal in a wireless communication system according to an embodiment of the present invention.

Referring to FIG. 2, first, a UE measures signal strength of a serving base station (serving cell) in step 201. In this case, the terminal may measure, for example, a carrier ti interference and noise ratio (CINR) or a received signal strength indication (RSSI) of a signal received from a serving base station.

In step 203, the terminal determines whether the measured signal strength of the serving base station is smaller than a set value. If the signal strength of the serving base station is greater than the set value, the terminal returns to step 201 for the next measurement. The signal strength of the serving base station may be performed continuously or periodically or by an event trigger. If the signal strength of the serving base station is less than or equal to the set value, the terminal proceeds to step 205.

If the signal strength of the serving base station is smaller than the set value, it means that the terminal is moving to the cell edge (cell edge) area. The present invention finds a neighboring base station that is missing in the neighbor list through a full search for the neighboring base station. The setting value is preferably set in consideration of the full search. That is, the set value may be set to an appropriate value through experiment.

In step 205, the terminal transmits a search request message for a full search to the serving base station. In this case, the search request message may include a message type indicating a full search request, a san duration, and an interval between scanning iteration and an interleaving interval when the scanning operation is repeatedly repeated. And the like.

After transmitting the search request message, the terminal receives a search response message from the serving base station in step 207. In this case, the search response message may include a message type indicating a response to the search request, a report mode (no report / periodic report / event triggered report, etc.), a scan report period, a report metric (CINR / RSSI / Relative delay / RTD, etc.). In the case of periodic scanning, the interval may include a scanning count and an interval between scanning operations.

When the search response message is received, the terminal scans according to the information of the scan response message in step 209. In this case, according to the present invention, the terminal measures signal strengths (eg, CINR, RSSI) of all base stations except for the serving base station (all preamble index numbers (PNs)). As another example, the terminal may measure a relative delay or a round trip delay (RTD) of the base station according to a command specified in the search response message.

In step 211, the terminal determines the base stations whose measured signal strength is greater than or equal to a set value. That is, base stations adjacent to the serving base station are determined. In step 213, the terminal compares the determined list of base stations with a neighbor list received from the serving base station. In step 215, the terminal determines whether there is a neighbor base station missing from the neighbor list.

If there is no missing neighbor base station, the terminal terminates the algorithm according to the present invention. If the missing neighbor base station exists, the terminal proceeds to step 217 and reports the missing base station list to the serving base station. In this case, the report message may include a message type, a report mode (event-triggered report / periodic report, etc.), a report metric, a missing base station list (BS_ID (or preamble index) + measurement value), and the like.

3 is a flowchart illustrating an operation procedure of a base station in a wireless communication system according to an exemplary embodiment of the present invention.

Referring to FIG. 3, the base station first checks whether a neighbor list is received from a system manager (WSM, EMC, OMC, etc.) in step 301. When the neighbor list is received, the base station stores the received neighbor list in a database. Here, the neighbor list may be delivered to the base station when the base station is initially set up or when a specific event (a neighbor list update) occurs. The neighbor list includes information on each of neighboring base stations neighboring the base station (physical layer profile information, FA index, EIRP value, BSID, preamble index / subchannel index, handover procedure optimization information, supported scheduling service, DCD). CCC, UCD CCC, etc.).

In step 305, the base station determines whether a transmission time of a neighbor advertisement (NBR-ADV) message has been reached. In general, the neighbor advertisement message may be transmitted at a set cycle. When the transmission time is reached, the base station proceeds to step 307 to broadcast a neighbor advertisement message including the neighbor list.

In step 309, the base station checks whether a report message for reporting the missing base station list is received. The report message may include a message type, a report mode (event-triggered report / periodic report, etc.), a report metric (CINR / RSSI / Relative delay / RTD, etc.), a missing base station list (BS_ID (or preamble index) + measurement). Value) and the like.

When the report message is received, the base station compares the neighbor list with the missing base station list extracted from the report message in step 311. In step 313, the base station determines whether there is a neighboring base station missing from the neighbor list. If it is determined that the reported missing base station information is not justified, the base station terminates the algorithm according to the present invention. If the reported missing base station information is determined to be legitimate, the base station stores the reported missing base station list in an alarm database in step 315.

In step 317, the base station determines whether the alarm transmission time has been reached. Here, the alarm may be delivered to the system manager at a set cycle or by an event trigger. When the alarm transmission time is reached, the base station proceeds to step 319 and delivers an alarm message including a list of missing base stations to the system manager.

Although not described in detail in the above-described embodiment of FIG. 3, the base station may update the neighbor list by using the missing base station list and notify the system manager of the result. In this case, when updating the neighbor list, the base station may update the neighbor list only when the corresponding missing base station is reported from several terminals.

4 is a flowchart illustrating an operation procedure of a system manager in a wireless communication system according to an exemplary embodiment of the present invention.

Referring to FIG. 4, the system manager first checks whether an alarm message is received from the base station in step 401. When the alarm message is received, the system manager analyzes the alarm message in step 403. In operation 405, the system manager checks whether the alarm message includes the missing base station list. Here, the missing base station list indicates a list of base stations missing from the neighbor list of the base station.

If the missing base station list is included, the system manager proceeds to step 407 to verify the missing base station list. If there is an automatic verification algorithm, the system manager may automatically verify the missing base station list according to the algorithm. If there is no automatic verification algorithm, the system manager may output a corresponding alarm to a monitor and wait for an operator input.

As a result of the verification, when the neighbor list needs to be updated, the system manager proceeds to step 411 to update the neighbor list. At this time, the system manager updates the neighbor list by an automatic verification algorithm, or updates the neighbor list according to an operation input. In addition, when a neighbor list update is required for other base stations in addition to the base station that reported the missing base station list, the corresponding neighbor list is also updated. In step 413, the system manager transmits the updated neighbor list to the base station.

5 illustrates a signal exchange procedure according to verification and update of a neighbor list in a wireless communication system according to an embodiment of the present invention.

Referring to FIG. 5, in step 501, a UE receives a neighbor message including a neighbor list from a serving base station and stores the neighbor list. The stored neighbor list may be used to scan neighboring base stations. That is, the terminal measures the signal strength of neighboring base stations included in the neighbor list, and attempts a handover if the measurement result satisfies a predetermined condition.

In step 503, the terminal measures the signal strength of the serving base station and checks whether the measured value satisfies a condition for full search. If the condition is satisfied, the terminal transmits a search request message to the serving base station requesting a full search in step 505.

In step 507, the serving base station transmits a search response message for the search request message to the terminal. In step 509, the terminal scans according to the information of the search response message. In this case, the terminal measures the signal strength of all base stations (all preamble index) except for the serving base station, and determines the base station whose measured signal strength is greater than or equal to a set value. The terminal compares the determined list of base stations with the neighbor list and checks whether there is a missing neighbor base station.

If there is a missing neighbor base station, the terminal transmits a report message including the missing base station list to the serving base station in step 511. In step 513, the serving base station extracts the missing base station list from the report message, and determines whether the missing base station list is valid. If determined to be legitimate, the serving base station transmits an alarm message including the missing base station list to a system manager in step 515.

In operation 517, the system manager extracts the missing base station list from the alarm message and verifies the missing base station list. At this time, if it is determined that the neighbor list update is necessary, the system manager updates the neighbor list. In operation 519, the system manager transmits the updated neighbor list to the corresponding base station.

In operation 521, the serving base station stores the updated neighbor list from the system manager. Thereafter, the broadcasted NAVER advertisement message includes the updated neighbor list.

6 illustrates a configuration of a terminal in a wireless communication system according to an embodiment of the present invention.

As illustrated, the terminal includes a neighbor list storage unit 600, a controller 602, an encoder 604, a resource mapper 606, an OFDM modulator 608, an RF transmitter 610, a duplexer 612, and an RF. A receiver 614, an OFDM demodulator 9616, a resource demapper 618, a decoder 620, and a reception strength measurement unit 622 are configured.

Referring to FIG. 6, first, the neighbor list storage unit 600 stores a neighbor list extracted from a neighbor advertisement message received from a serving base station. The controller 602 controls the overall operation of the terminal, and performs the neighbor list verification according to the present invention. In addition, the controller 602 generates and transmits a transmission signaling message (eg, a MAC management message) to the encoder 604 and performs a function of interpreting the reception signaling message from the decoder 620.

The encoder 604 codes and modulates the message from the controller 602 according to a predetermined modulation level (Modulation and Coding Scheme (MCS) level). The resource mapper 606 maps burst data from the encoder 604 to a corresponding resource (or subcarrier). The OFDM modulator 606 generates sample data by inverse fast fourier transform (IFFT) of the data from the resource mapper 606, and generates an OFDM symbol by inserting a guard interval (CP: Cyclic Prefix) into the sample data. do. The RF transmitter 610 converts the sample data from the OFDM modulator 608 into an analog signal, and converts the analog signal into a radio frequency (RF) signal.

The duplexer 612 transmits the received signal from the antenna to the RF receiver 614 by the duplexing method, and transmits the transmitted signal from the RF transmitter 610 through the antenna. In this case, the duplexing scheme may include time division duplexing (TDD), frequency division duplexing (FDD), half duplex-frequency division duplexing (H-FDD), and the like.

The RF receiver 614 converts a radio frequency (RF) signal from the duplexer 612 into a baseband analog signal, converts the analog signal into sample data, and outputs the converted analog signal. The OFDM demodulator 616 removes the guard interval from the sample data from the RF receiver 614 and generates data in the frequency domain by fast Fourier transform (FFT). The resource demapper 618 extracts burst data to be actually received from the data of the frequency domain and provides the decoded burst data to the decoder 620. In addition, the resource demapper 618 extracts a signal (eg, a preamble signal, a pilot signal, etc.) used for the reception strength measurement and provides the signal to the reception strength measurement unit 622.

The decoder 620 demodulates and decodes the data from the resource demapper 618 according to a predetermined modulation level (MCS level). On the other hand, the reception strength measurement unit 622 measures the signal strength of the base station using the signal from the resource demapper 618, and provides the measured result to the control unit 602. Here, the signal strength may be CINR, RSSI, etc., and according to a report metric specified in a search response message, the reception strength measurement unit 622 may measure a relative delay, RTD, etc. of a base station. It may be.

Looking at the operation of the terminal according to the configuration of FIG. 6 described above are as follows.

First, the reception strength measurement unit 622 measures the signal strength of the serving base station under the control of the control unit 602 and reports it to the control unit 602. Then, the controller 602 checks whether the measured value satisfies a condition for full search. If the condition is satisfied, the controller 602 generates a search request message for requesting a full search and transmits it to the encoder 604 of the physical layer. The search request message transmitted to the physical layer is processed in the physical layer and transmitted to the serving base station. Thereafter, the controller 602 checks whether a search response message is received from the serving base station, and controls the scanning operation according to the information of the search response message when the search response message is received. That is, the reception strength measurement unit 622 measures the signal strength of all base stations (all preamble indexes) except the serving base station under the control of the control unit 602 and provides the signal strength to the control unit 602.

Then, the controller 602 determines a base station whose measured signal strength is greater than or equal to a set value, and compares the determined list of base stations with a neighbor list stored in the storage unit 600 to check whether there are any missing base stations. If there is a missing neighbor base station, the controller 602 generates a report message including the missing base station list and delivers the report message to the physical layer. The report message is then physical layered and transmitted to the serving base station.

The missing base station list transmitted to the serving base station is verified in the serving base station or system management, and the neighbor list may be reconstructed if necessary.

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

Claims (20)

In the method of operation of a terminal in a wireless communication system, If the signal strength of the serving base station satisfies a predetermined condition, a process of allocating a scan interval for full search; Performing a full search during the allocated scan period; Comparing the full search result with a current list of neighbors; And transmitting a report message including the missing base station list to the serving base station when the neighboring base station is missing from the neighbor list. The method of claim 1, wherein the comparing process, Determining a base station having a signal strength greater than or equal to a set value using the full search result; And comparing the determined list of base stations with a neighbor list received from the serving base station. The method of claim 1, wherein the step of assigning the scan interval comprises: Transmitting a search request message requesting a full search to the serving base station; And receiving a search response message in response to the search request message. The method of claim 3, The search request message may include at least one of a message type indicating a full search request, a scan interval, a scanning frequency, and an interval between scanning operations. The method of claim 3, The search response message may include at least one of a message type indicating a response to a full search request, a report mode, a scan report period, a report metric, a scanning frequency, and an interval between scanning operations. How to. The method of claim 1, wherein the full search is performed. And measuring at least one of a carrier to interference and noise ratio (CINR), a received signal strength indiantor (RSSI), a relative delay, and a round trip delay (RTD) for each base station. The method of claim 1, And receiving a neighbor advertisement message including a neighbor list periodically from the serving base station. The method of claim 1, The report message, characterized in that it comprises at least one of a message type indicating a missing base station list report, a reporting mode, a report metric, a missing base station list. In the method of operation of a base station in a wireless communication system, Periodically transmitting a NAVER advertisement message including a NAVER list; Allocating a scan interval to a terminal requesting a full search; Receiving a report message including a list of missing base stations from the terminal; And sending an alarm message including the missing base station list to a system manager. The method of claim 9, Receiving the updated neighbor list from the system manager; And updating the currently held neighbor list with the received neighbor list. The method of claim 9, wherein the transmitting to the system manager comprises: Updating a neighbor list currently held by the missing base station list; Transmitting the updated neighbor list to the system manager. The method of claim 9, wherein the transmitting to the system manager comprises: Verifying validity of the missing base station list received from the terminal; If it is determined that the missing base station list is valid, storing the missing base station list in an alarm database; Transmitting an alarm message including the missing base station list to the system manager when an alarm transmission time is reached. In the method for verifying the neighbor list in a wireless communication system, When the specific event occurs, the terminal is allocated a scan interval for full search and performs a full search; Comparing, by the terminal, the neighbor search list received from the serving base station with the full search result, and determining a base station missing from the neighbor list; Transmitting, by the terminal, the determined missing base station list to the serving base station; Transmitting, by the serving base station, the missing base station list to a system manager. The method of claim 13, Verifying, by the system manager, the missing base station list and reconfiguring the neighbor list; Transmitting, by the system manager, the reconfigured neighbor list to the serving base station; The serving base station further comprises the step of updating the neighbor list currently held to the received neighbor list. The method of claim 14, And the serving base station periodically broadcasting a neighbor advertisement message including the neighbor list. The method of claim 13, wherein the full search is performed. For each base station, measuring at least one of CINR, RSSI, relative delay, and Round Trip Delay (RTD). A terminal device in a wireless communication system, If the signal strength of the serving base station satisfies a predetermined condition, the search section for the full search (research), the search unit for performing a full search during the assigned scan period, and A control unit for comparing a search result from the search unit with a neighbor list currently held, and generating a report message including a missing base station list when there is a neighboring base station missing from the neighbor list; And a transmitter for physically processing the report message from the controller and transmitting the report message to the serving base station. The method of claim 17, The search unit, for each base station, characterized in that for measuring at least one of the CINR, RSSI, relative delay (Round Trip Delay), RTD (Round Trip Delay). The method of claim 17, A receiving unit for receiving a neighbor advertisement message including a neighbor list periodically from the serving base station; And a storage unit which stores a neighbor list extracted from the neighbor advertisement message. The method of claim 17, And the report message includes at least one of a message type indicating a missed base station list report, a report mode, a report metric, and a missed base station list.