KR20180105001A - Method and terminal unit for generating neighbor list - Google Patents

Abstract

A neighbor list generation method and terminal are provided. A first base station generates a neighbor list in a carrier aggregation-based wireless communications system including at least one primary cell using a first frequency and at least one secondary cell using a second frequency different from the first frequency. The present invention comprises the steps of: receiving a measurement report including a signal measurement result of each of a primary cell to which a terminal is connected, a serving secondary cell, and a target secondary cell from the terminal; receiving cell information by requesting the terminal to measure the cell information on a cell identifier of the target secondary cell included in the measurement report; and registering the cell information in an intra-frequency neighbor list and an inter-frequency neighbor list.

Description

METHOD AND TERMINAL UNIT FOR GENERATING NEIGHBOR LIST

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of generating a neighbor list and a terminal, and more particularly, to a technique of generating a neighbor list in a carrier aggregation (CA) based wireless communication system including a plurality of cells using different carrier frequencies.

In the current communication system, the Neighbor List generation function through Automatic Neighbor Relation (ANR) has a function of generating an intra-frequency Naver list and an inter-frequency Naver list generation function Are operating separately. In particular, when generating a Naver list between heterogeneous frequencies, a measurement gap may or may not be required depending on the capability of the terminal.

Generally, a UE supporting Carrier Aggregation (CA) does not need a measurement gap when generating a cross-frequency Naver list. However, a measurement gap is required for a terminal supporting only multi-carrier (MC) supporting multiple frequencies. However, when the measurement gap is used, deterioration of the downlink function necessarily occurs, and the terminal often generates an error due to frequent measurement. In order to solve such a problem, a separate function is required to operate the Naver list generating function only for terminals that do not need a measurement gap by referring to the capability of the terminal when generating a Naver list between different frequencies. In response to this demand, current communication systems are being operated using A3 measurement events or using measurement gaps depending on the capabilities of the terminal while using A5 measurement events.

When a signal intensity of a primary cell (Pcell) is measured below a predetermined threshold value, that is, when the signal intensity of a primary cell (Pcell) is A2 When the measurement event is satisfied, measurement of another predetermined frequency is performed. Next, the terminal determines whether the signal of the primary cell (Pcell) and the signal of the secondary cell (Scell) satisfy the predetermined offset using the A3 measurement event, and if the signal is satisfied, And transmits a Physical Cell Identifier (PCI) and signal strength to the base station. The base station sets measurement conditions to the UE so as to report the cell information on PCI of another frequency, for example, ECGI (E-UTAN Cell Global Identifier). Then, the UE acquires cell information such as ECGI, TAC (Tracking Area Cod), and PLMN ID (Public Land Mobile Network Identifier) from the system information (e.g., SIB # 1) . The base station transmits the cell identifier of another frequency to the Mobility Management Entity (MME), receives the IP of the base station, sets up the X2 interface, and registers the cell identifier of the other frequency in the inter-frequency neighbor list.

However, in the case of the A3 measurement event, the signal intensity of the primary cell (PCell) is implemented to measure another frequency below a predetermined value. This is because it is not necessary to move to another frequency when the own signal is good.

However, if the coverage of the primary cell (Pcell) and the secondary cell (Scell) do not match exactly or the coverage of the secondary cell (Scell) is small, the intra-frequency Naver list generation is not performed well, There is a case where the drawing (CA) function is not maximized. Also, if the signal is good, if the measurement is performed to generate the Naver list for the other frequency, the terminal may perform unnecessary measurement and cause abnormal operation.

In the A3 measurement event, the measurement ID is set differently when generating the inter-frequency Naver list and generating the intra-frequency Naver list. In generating an inter-frequency neighbor list, a Naiver list is generated if the threshold value is satisfied. Therefore, Naiver list generation is flexible according to the signal strength of the primary cell (Pcell). Since the primary cell (Pcell) and the target secondary cell (Target Scell) are compared, the coverage between the secondary cells (Scell) can not be known accurately.

On the other hand, when the A5 measurement event is used in the past, the intra-frequency Naver list generation is not used.

When an inter-frequency neighbor list is generated using the A5 measurement event, the base station transmits the A5 measurement event to the terminal when the initial call is set. The terminal immediately measures the other frequency to confirm that the A5 measurement event is satisfied. In this case, since the A5 measurement event is formed by combining the signal strength condition of the own cell and the signal strength condition of another frequency, the threshold value for the signal strength (absolute value) of another frequency is very important. The operation after measurement is the same as the above-described A3 measurement event.

However, in the case of this A5 measurement event, since it is triggered with a specific threshold value, it operates very sensitively to the threshold value. Therefore, it is difficult to obtain an optimal Naver list if it is shifted to the threshold value. In addition, since the absolute values (Threshold 1, Threshold 2) are used as the threshold values, the coverage between the secondary cells (Scell) can not be precisely known, and the generation of the inter-frequency Naiver list is flexible according to the threshold value.

It is very important that the secondary cell (Scell) is well defined in the primary cell (Pcell) to generate the Naver list since the inter-frequency frequency Naver list is directly related to the carrier aggregation (CA).

However, in the past, since the function of generating the Naver list between heterogeneous frequencies is not accurate, the operator individually inputs whether or not to use the carrier aggregation (CA) function for the generated Naver list. That is, after generating the Naver list using the A3 measurement event and the A5 measurement event, the operator turned on the carrier aggregation (CA) in consideration of the cell coverage.

An object of the present invention is to provide an apparatus and method for generating a Naver list and an Inter-frequency Naver list of an Intra-frequency using an A6 measurement event in an automatic neighbor relationship (ANR) SCell), and a base station that performs the carrier list aggregation (CA).

A method of generating a neighbor list according to an exemplary embodiment of the present invention includes generating at least one primary cell using a first frequency and at least one secondary cell using a second frequency different from the first frequency, A method of generating a neighbor list by a first base station in a carrier aggregation based wireless communication system including a primary cell and a secondary cell, the method comprising: receiving a primary cell and a serving secondary cell, Receiving a measurement report including a signal measurement result of the measurement secondary cell, requesting the terminal to measure cell information on a cell identifier of the target secondary cell included in the measurement report and receiving the cell information, Information to an inter-frequency Naver list and an inter-frequency Naver list And a step of each register.

Further comprising the step of setting a specific event to the terminal when the primary cell served by the first base station supports the carrier merging service before the step of receiving, When a particular event is triggered, it receives the measurement report, and the particular event may be triggered when the signal strength of the target cell is greater than the signal strength of the serving cell by a predefined offset.

Wherein the step of registering comprises the steps of: checking IP information of a second base station serving the target secondary cell using the cell information from the core network; comparing the IP information of the second base station with the second base station Setting an interface, and registering the cell information in an inter-frequency neighbor list.

The registering step may include registering the cell information in an intra-frequency neighbor list when it is confirmed that the first base station is serving the serving secondary cell after receiving the cell information .

Wherein the registering step includes registering the target secondary cell to the third base station servicing the serving secondary cell when it is determined that the first base station does not serve the serving secondary cell after receiving the cell information Wherein the third base station checks the IP information of the second base station serving the target secondary cell using the cell information from the core network and sets the base station interface with the second base station , And the cell information can be registered in the same frequency-frequency (Na) list.

According to another aspect of the present invention, there is provided a terminal including at least one primary cell using a first frequency, at least one secondary cell using a second frequency different from the first frequency, Wherein the primary cell and the secondary cell are connected to each other by at least one base station that serves the primary cell and the secondary cell, A communication device for transmitting and receiving a radio signal, a memory for storing a program for performing cell measurement for generating an inter-frequency Naver list and an inter-frequency Naver list, and a processor Wherein the program is triggered when a specific event set from the base station is triggered Measures a signal of each of the primary cell and the serving secondary cell and the target secondary cell to which the terminal is connected and transmits a measurement report including the signal measurement result and each cell identifier to the base station, Wherein the target secondary cell includes instructions for acquiring cell information through the system information of the target secondary cell and transmitting the cell information to the base station, wherein the target secondary cell includes an intra-frequency Naver list and an Inter- frequency) Naver list, respectively.

Wherein the measurement report includes a Physical Cell Identifier (PCI) of the target secondary cell, the program further comprising: requesting the base station to acquire cell information for a physical cell identifier (PCI) of the target secondary cell from the base station And the cell information may include at least one of an E-UTAN Cell Global Identifier (ECGI), a Tracking Area Code (TAC), and a Public Land Mobile Network Identifier (PLMN ID).

According to the embodiment of the present invention, carrier aggregation (CA) with cells in the base station and carrier aggregation between cells of other base stations are automatically set and operated through addition of an automatic neighbor relationship (ANR) function. Accordingly, it is possible not only to reduce the workload of the operator and the operation error of the operator, but also to cope with various radio environments optimally due to the change of the cell coverage.

In addition, by generating the intra-frequency Naver list and the Inter-frequency Naver list using the A6 measurement event, it is possible to generate the neighbors more efficiently than those in the conventional manner. In addition, the carrier aggregation (CA) is automatically set when the Naver list is generated. Thus, the Naver list can be created and deleted flexibly according to the change in the coverage of the secondary cell (Scell) The efficiency of the service can be maximized.

In addition, when the automatic neighbor relationship (ANR) operation is performed only with the A6 measurement event, since the measurement gap is not required, the load on the terminal can be minimized and the traffic loss can also be minimized.

In addition, since the signal strength difference between the secondary cells is used, the coverage between the secondary cells can be accurately known, the DB change of the operator can be minimized with a simple algorithm, .

1 is a configuration diagram of a communication system according to an embodiment of the present invention.
2 is a diagram for explaining generation of a Naver list according to an embodiment of the present invention.
3 is a flowchart illustrating a cell measurement method for generating a neighbor list according to an embodiment of the present invention.
4 is a flowchart illustrating a method of generating a neighbor list according to an embodiment of the present invention.
5 is a diagram for explaining a method of generating a neighbor list according to an embodiment of the present invention, in comparison with a conventional method.
6 is a block diagram illustrating a hardware configuration of a terminal and a base station according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise. Also, the terms " part, "" module," and " module ", etc. in the specification mean a unit for processing at least one function or operation and may be implemented by hardware or software or a combination of hardware and software have.

In this specification, a terminal is a user equipment, a device, a user equipment (UE), a mobile equipment (ME), a mobile station (MS), a mobile terminal (MT), a subscriber station SS, a portable subscriber station (PSS), a user equipment (UE), an access terminal (AT), or the like, and may be referred to as a mobile terminal, User devices, and the like.

A base station (BS) includes an access point (AP), a radio access station (RAS), a node B, a base transceiver station (BTS), a mobile multihop relay ) -BS, and may include all or some of the functions of the access point, the radio access station, the node B, the base transceiver station, and the MMR-BS.

1 is a configuration diagram of a communication system according to an embodiment of the present invention.

Referring to FIG. 1, a communication system includes a plurality of base stations 200 connected to a terminal 100, and a core network 300 for managing a plurality of base stations 200 and providing communication services. Here, the core network 300 may be an EPC (Evolved Packet Core) including an MME (Mobility Management Entity) The MME 301 has information on the connection information of the terminal 100 and the capability of the terminal 100 and this information is mainly used for managing the mobility of the terminal 100. [

The terminal 100 can simultaneously use a primary cell (Pcell) and a secondary cell (Scell) using different carrier frequencies. That is, Carrier Aggregation (CA) can be used. Carrier aggregation (CA) is a technology that binds and uses different frequency bands at the same time, and a wider frequency bandwidth can be used.

The carrier aggregation CA includes a primary cell Pcell for establishing an initial connection process and a reconnection process with the base station 200 and a secondary cell Scell added to the primary cell Pcell, .

In a communication system using carrier aggregation (CA), a terminal has multiple serving cells. In a number of serving cells, one of them is a primary cell (Pcell) and the other is a secondary cell (Scell). At this time, a primary cell (Pcell) is used to transport physical uplink control channels (PUCCHs).

Without reliable transmission of the physical layer control < RTI ID = 0.0 > control information, < / RTI > Therefore, the primary cell of the terminal (Pcell) should have a relatively good channel state. In order to ensure that the primary cell (Pcell) of the UE has a relatively good channel state, it is necessary to perform a measurement configuration for the UE.

The terminal 100 can acquire a cell identifier by receiving a signal transmitted from the base station 200, for example, a broadcast message. The terminal 100 delivers a measurement report including the acquired cell identifier to the serving base station currently serving the terminal 100. [

The UE 100 measures adjacent cells and adjacent frequencies in a manner triggered by a measurement event determined in a measurement configuration received from the base station 200 and transmits a measurement report including measurement results to the base station 200 (200). At this time, the terminal 100 transmits a measurement report message including information on a new neighbor cell to the base station 200.

Here, the primary cell (Pcell) and the secondary cell (Scell) are terms indicating the type of the serving cell to be set in the UE 100. [ At this time, the secondary cell (Scell) is basically handled as a serving cell, but it is also handled as a neighbor cell in a specific measurement event. The primary cell (Pcell) always remains active, but the secondary cell (Scell) can repeat the active state and the deactivated state according to an instruction from the base station 200, for example. The mobility of the UE 100 is controlled around a primary cell Pcell and the secondary cell Scell is an additional serving cell for data transmission and reception.

The measurement events associated with the primary cell Pcell may be events A1, A2, A3 and A5 defined in the communication system and the measurement events associated with the secondary cell Scell may be A1, A2 and A6. Here, each measurement event is defined as shown in Table 1 below.

Event type
(Event Type) Description Event A1 Serving becomes better than threshold Event A2 Serving becomes worse than threshold Event A3 Neighbor becomes offset better than serving Event A4 Neighbor becomes better than threshold Event A5 Serving becomes worse than threshold1 and neighbor becomes better than threshold2 Event A6 Neighbor becomes offset better than SCell (This event is introduced in Release 10 force)

According to Table 1, Event A1 is triggered when the signal of the serving cell is greater than a certain threshold. Event A2 is triggered when the signal of the serving cell is smaller than a certain threshold value. Event A3 is triggered when the signal of the neighbor cell is larger than the signal of the serving cell by the A3 offset. Event A4 is triggered when the signal of the neighbor cell is larger than a certain value. Event A5 is triggered when the signal of the serving cell is smaller than the specified value (threshold1) and the signal of the neighbor cell is larger than the specified value (threshold2). Event A6 is triggered when the signal of the neighbor cell is larger than the signal of the secondary cell by an offset of A6. Here, the A6 offset is set to a relative value. Event A6 differs from Event A3 in that Event A3 is a handover condition for a primary cell, and Event A6 is a condition for handover to a secondary cell.

When the terminal 100 satisfies the specific event set as shown in Table 1, the terminal 100 transmits a measurement report message to the base station 200. At this time, the terminal 100 supports the A6 measurement event.

The base station 200 is connected to the core network 300 and provides a communication service to the terminal 100 located in the cell coverage managed by the base station 200. The base station 200 provides a wireless interface to the terminal 100 and provides radio resource management functions such as radio bearer control, radio admission control, dynamic radio resource allocation, load balancing, and inter-cell interference control.

The base station 200 automatically generates and updates a neighbor list according to the support of the Self Organizing Network (SON), directly connects with other base stations, So that control signals between the base stations can be exchanged without passing through. This processing function is called automatic neighbor relation (ANR) configuration.

At this time, the base station 200 simultaneously generates an inter-frequency Naver list and an inter-frequency Naver list using the A6 measurement event.

2 is a diagram for explaining generation of a Naver list according to an embodiment of the present invention.

Referring to FIG. 2, Freq # 1 Cell A and Freq # 1 Cell B are primary cells (Pcell), Freq # 2 Cell 1, Freq # 2 Cell 2, Freq # 2 Cell 3 are secondary cells .

When the terminal 100 is in the coverage of the Freq # 1 Cell A coverage and the Freq # 2 Cell 1, the UE 100 performs a carrier merge service consisting of Freq # 1 Cell A (PCell) and Freq # 2 Cell 1 (Scell) . Thereafter, when the terminal 100 moves in the direction 1, an A6 measurement event occurs. A6 measurement event, the UE 100 transmits the measurement results of Freq # 1 Cell A and Freq # 2 Cell 1, which are currently connected primary cells (Pcell), and the measurement results of Freq # 2 Cell 2, And reports the measurement result to the base station 200. At this time, the measurement result includes the physical cell identifier (PCI) of each cell.

As described above, there are two secondary cells (Scell) in the coverage of the primary cell (Pcell). In this case, Freq # 1 Cell A can generate Freq # 2 Cell 2 as a Naver list. And Freq # 2 Cell 1 is right next to Freq # 2 Cell 2. As a result, when the A6 measurement event occurs, it is possible to generate a Naver list between Freq # 1 Cell A and Freq # 2 Cell 2, and generate a Naver list between Freq # 2 Cell 1 and Freq # 2 Cell 2 .

The call processing reads the E-CGI (Euthentic Cell Global ID) of the Freq # 2 Cell 2 by utilizing the automatic neighbor list generating function and automatically transmits the same same frequency list to the base station 200, Inter-frequency Naver list is generated.

Conventionally, the base station 200 is implemented to acquire a measurement result by giving an Intra-frequency measurement ID and an Inter-frequency measurement ID, respectively, and then generate a Naver list. That is, the base station 200 transmits the A3 measurement event or the A5 measurement event for each frequency to the terminal 100, and reads the E-CGI based on the measurement result to generate a Naver list. However, using the A6 measurement event as in the present invention, the base station 200 reads the E-CGI at a time through the AT 100 and generates an inter-frequency Naver list and an Inter-frequency Naver list You can create a list. And, if Carrier Aggregation (CA) is automatically set when creating an automatic Naver list using A6 measurement event, it can automatically cope with Coverage change of Freq # 2 Cell 2. In addition, the base station 200 can turn on the carrier aggregation (CA) function at the same time as generating the inter-frequency neighbor list.

Now, a process of generating the Naver list using the A6 measurement event by the base station 200 will be described as follows.

3 is a flowchart illustrating a cell measurement method for generating a neighbor list according to an embodiment of the present invention.

Referring to FIG. 3, the base station 200 serving the primary cell (Pcell) confirms whether the cell is a cell capable of carrier merging (S101), and if possible, transmits the A6 measurement event to the terminal 100 (S103).

The terminal 100 determines whether or not the A6 trigger condition is satisfied (S105), and if it is satisfied, the terminal 100 sets the primary cell (Pcell), the serving secondary cell (Serving Scell), the target secondary And measures the signal strength of the cell (Target Scell) (S107). The measurement report including the measured signal strength is transmitted to the base station 200 (S109). At this time, the offset may be set to a relative value rather than an absolute value.

Conventionally, when the A3 measurement event is used, since the signals of the primary cell (Pcell) and the target secondary cell (Target Scell) are used, there is no information on the coverage state between the secondary cells (Scell). That is, since the coverage comparison between the primary cell (Pcell) and the secondary cell (Scell) is comparable, the efficiency of carrier aggregation (CA) may be reduced. However, in the present invention, the primary cell (Pcell), the serving secondary cell Since the target secondary cell is used, the coverage between the secondary cells Scell can be compared and the efficiency of carrier aggregation (CA) is improved.

FIG. 4 is a flowchart illustrating a method of generating a neighbor list according to an exemplary embodiment of the present invention, illustrating operations added after step S109 of FIG.

Referring to FIG. 4, upon receiving a measurement report from the terminal 100, the base station 200 serving the primary cell (Pcell) transmits a target secondary cell measurement request to the terminal 100 (S201 ). Here, the target secondary cell measurement request includes a measurement condition for measuring cell information on the physical cell identifier (PCI) of the target secondary cell included in the measurement report. At this time, the cell information includes an ECGI (E-UTAN Cell Global Identifier), a TAC (Tracking Area Cod), a PLMN ID (Public Land Mobile Network Identifier)

The terminal 100 receives system information (e.g., SIB # 1) broadcasted on a target secondary cell frequency (S203), acquires cell information from the system information (S205), and transmits the cell information to the base station 200 (S207).

The base station 200 requests the base station IP of the target secondary cell to the MME 301 using the cell information received in step S207, for example, the cell ID (S209) (S211).

The base station 200 sets up the X2 interface with the base station 200 serving the target secondary cell using the base station IP of the target secondary cell in step S213 and receives the base station information in step S215 . Then, the target secondary cell (Target Scell) is added to the inter-frequency neighbor list (S217).

In addition, the base station 200 determines whether it is a base station servicing a serving secondary cell (S219). That is, when it is confirmed that the base station 200 serving the primary cell (Pcell) is serving the Serving Scell, the target secondary cell (Target Scell) is added to the intra-frequency neighbor list (S221).

On the other hand, if the base station 200 serving as the primary cell does not serve the Serving Scell, the target secondary cell is transmitted to the serving base station 200 serving the Serving Scell, And transmits an identifier to request Naver list registration (S223).

The base station 200 serving the Serving Scell requests the base station IP of the target secondary cell to the MME 301 in step S225 and receives the base station IP in step S227. Then, the X2 interface is set up with the base station 200 serving as the target secondary cell (S229), and the base station information is received (S231). Then, the target secondary cell (Target Scell) is added to the inter-frequency Naver list (S233).

Here, steps S209 to S217 and steps S219 to S233 may be performed simultaneously.

As described above, the efficiency of the carrier aggregation CA can be maximized by simultaneously generating the inter-frequency Naver list and the inter-frequency Naver list using the A6 measurement event .

5 is a diagram for explaining a method of generating a neighbor list according to an embodiment of the present invention, in comparison with a conventional method.

Referring to FIG. 5A, F2_acell and F2_cell are secondary cells and F1_Acell, F1_Bcell and F1_Ccell are primary cells. Referring to FIG. 5B, F2_acell, F2_bcell, F2_Ccell Is a secondary cell (Scell), and F1_Acell, F1_Bcell, and F1_Ccell are primary cells (Pcell).

That is, when the network environment change, that is, the change in the coverage of the secondary cell (Scell) occurs as shown in FIGS. 5A and 5B, using the A6 measurement event as shown in FIGS. 3 and 4 , The newly generated F2_Ccell may be added to the inter-frequency Naver list and the Intra-frequency Naver list.

In the network environment shown in FIG. 5 (b), when the UE moves into the coverage of F1_Ccell, the UE reports to the BS that the signal of F2_ccell is good due to the A6 measurement event. Then, the base station registers the reported F2_Ccell in the inter-frequency Naver list and the intra-frequency Naver list, and also carries a carrier aggregation (CA) combining the F1 frequency and the F2 frequency, Service can be provided. Then, the other terminal can use the already generated F2_Ccell in the carrier aggregation (CA) service.

Conventionally, since it is limited to driving the carrier aggregation (CA) service using the measurement events as shown in Table 1 based on the already generated Naver list, even if the terminal detects the signal of F2_ccell if it is not in the F2_ccell neighbor list, Can not be used for carrier aggregation (CA). However, according to the embodiment of the present invention, the Naver list can be updated quickly even if the Naver list is changed every day due to the change of coverage of the secondary cell (Scell) due to expansion or contraction of the equipment. In addition, since an inter-frequency Naver list and an ANR operation for generating an intra-frequency Naver list are performed only for the A6 measurement event, there is no need for a measurement gap Therefore, the load on the terminal can be minimized and the traffic loss can be minimized.

6 is a block diagram illustrating a hardware configuration of a terminal and a base station to which an embodiment of the present invention can be applied.

6, a terminal 100 includes a memory 101, a communication device 103, and a processor 105. [ The communication device 103 is connected to the processor 105 to transmit and / or receive a radio signal with the base station 200. The memory 101 is coupled to the processor 105 and stores a program that includes instructions that cause it to perform the configuration and / or methods in accordance with the embodiments described in Figs. 1-5. The processor 105 executes a program stored in the memory 101. [

The base station 200 includes a memory 201, a communication device 203, and a processor 205. The communication device 203 is connected to the processor 205 and transmits and / or receives a radio signal to / from the terminal 100. The memory 201 is coupled to the processor 205 and stores a program that includes instructions for causing the computer to perform the configuration and / or the method according to the embodiments described in Figs. 1-5. The processor 205 executes the program stored in the memory 201. [

The embodiments of the present invention described above are not implemented only by the apparatus and method, but may be implemented through a program for realizing the function corresponding to the configuration of the embodiment of the present invention or a recording medium on which the program is recorded.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

Claims (7)

A carrier aggregation based wireless communication system including at least one primary cell using a first frequency and at least one secondary cell using a second frequency different from the first frequency, A method for a first base station to generate a neighbor list in a communication system,
Receiving a measurement report including a signal measurement result of each of the primary cell and the serving secondary cell and the target secondary cell connected to the terminal from the terminal,
Requesting the terminal to measure cell information on a cell identifier of the target secondary cell included in the measurement report and receiving the cell information;
Registering the cell information in an inter-frequency Naver list and an inter-frequency Naver list, respectively
/ RTI > The method of claim 1,
Before the receiving step,
Further comprising setting a specific event to the terminal if the primary cell served by the first base station supports a carrier merging service,
Wherein the receiving comprises:
When the specific event is triggered at the terminal, receiving the measurement report,
The specific event may be,
Wherein the signal strength of the target cell is triggered when the signal strength of the target cell is greater than the signal strength of the serving cell by a predefined offset. The method of claim 1,
Wherein the registering step comprises:
Checking IP information of a second base station serving the target secondary cell using the cell information from the core network,
Establishing a base station interface with the second base station using the IP information of the second base station, and
Registering the cell information in an inter-frequency Naver list
/ RTI > 4. The method of claim 3,
Wherein the registering step comprises:
After receiving the cell information, if it is confirmed that the first base station is serving the serving secondary cell, registering the cell information in an intra-frequency neighbor list
≪ / RTI > 4. The method of claim 3,
Wherein the registering step comprises:
If the first BS is determined not to serve the serving secondary cell after receiving the cell information, requesting the third base station servicing the serving secondary cell to request registration of the target secondary cell and,
The third base station,
(BS) of a second base station serving the target secondary cell using the cell information from the core network, establishes a base station interface with the second base station, How to create a Naver list to subscribe to a Naver list. A carrier aggregation based wireless communication system including at least one primary cell using a first frequency and at least one secondary cell using a second frequency different from the first frequency, In a communication system, a terminal capable of using the primary cell and the secondary cell simultaneously,
A communication device for transmitting and receiving a radio signal to and from at least one base station that serves either or both of the primary cell and the secondary cell,
A memory for storing a program for performing cell measurement for generating an inter-frequency Naver list and an inter-frequency Naver list, and
And a processor for executing the program,
The program includes:
When a specific event set by the base station is triggered, measures a signal of each of the primary cell, the serving secondary cell, and the target secondary cell connected to the terminal, and transmits a measurement report including the signal measurement result and each cell identifier, Instructions for acquiring cell information through the system information of the target secondary cell requested from the base station and transmitting the acquired cell information to the base station,
Wherein the target secondary cell comprises:
And is registered in an intra-frequency neighbor list and an inter-frequency neighbor list, respectively. The method of claim 6,
The measurement report includes:
And a physical cell identifier (PCI) of the target secondary cell,
The program includes:
Wherein the mobile station is requested to obtain cell information for a physical cell identifier (PCI) of the target secondary cell from the base station,
The cell information includes:
An E-UTAN Cell Global Identifier (ECGI), a Tracking Area Cod (TAC), and a Public Land Mobile Network Identifier (PLMN ID).

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