KR101505086B1 - Apparatus and method for efficiently obtaining neighboring base station information in a mobile communication system - Google Patents

Abstract

A gap allocation method for a serving base station in a mobile communication system, in which a mobile station adjusts a gap for measuring neighboring base stations in order to efficiently acquire neighboring base station information, And a PCID (Physical Cell ID) transmitted from the MS to the serving BS is reused to acquire unique cell information such as a General Cell ID (GCID) through mapping information between the PCID and the GCID A step of allocating a gap to allow the MS to receive the GCID during a system information broadcasting time and a broadcasting period of the neighbor BS with respect to the PCID, receiving a message transmitted by the MS, And acquires the GCID by adjusting the gap interval for acquiring the GCID. There is an advantage that can reduce the liver, improve performance due to this.

CSG, GAP, PCID, GCID, 3GPP.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an apparatus and method for efficiently acquiring neighboring base station information in a mobile communication system,

The present invention relates to an apparatus and a method for efficiently allocating a gap in which a UE performs a measurement in order to acquire a unique cell ID of a neighboring cell in a mobile communication system.

In a mobile communication system using the 3rd Generation Partnership Project (3GPP) standard, a mobile station can know a PCID (Physical Cell ID) of a neighboring cell by receiving system information of a target base station during a normal gap pattern.

The UE informs the Serving Node B (SeNB) through a measurement report. The base station allocates a long gap to the mobile station when the serving base station is difficult to obtain the unique cell ID of the neighboring cell through the PCID.

The UE receives system information block 1 (SIB1) of a target eNode B (TENB) using the long gap and acquires a GCID (General Cell ID) which is a unique cell ID of the target BS .

Thereafter, the UE transmits a measurement report message to the serving BS to notify the serving BS of the GCID, and the serving BS determines whether to perform a handover to the UE based on the measurement report message do.

In the asynchronous mobile communication system using the 3GPP standard, it is impossible to know the broadcasting time of the system information (SIB1), which is the system information of the neighboring cell. Therefore, a long gap equal to or larger than the broadcasting period of the SIB1 is allocated to the terminal, Thereby acquiring the system information of the corresponding cell.

However, in order for the UE to acquire the GCID, the UE must be allocated a long gap even in the active state, and the data communication of the UE is interrupted during the long gap, thereby degrading system performance.

It is an object of the present invention to provide an apparatus and method for efficiently obtaining neighboring base station information in a mobile communication system.

It is another object of the present invention to provide a method for acquiring a GCID of a PCID detected by a mobile station in a mobile communication system by effectively adjusting a start point and an end point of a gap interval allocated for searching for a GCID of a neighbor cell, And to provide a device and a method capable of improving the performance due to the shortened gap section.

According to a first aspect of the present invention, there is provided a method of allocating a gap of a serving BS in a mobile communication system, the method comprising: acquiring a system information broadcasting cycle and a point of view of neighbor BSs; Cell ID) is reused and it is difficult to acquire unique cell information such as a general cell ID (GCID) through the mapping information between the PCID and the GCID, during the system information broadcasting time and the broadcasting period of the neighbor base station for the PCID, A step of allocating a gap to receive the GCID, a step of receiving a message transmitted by the terminal, and a step of acquiring a GCID in the message.

According to a second aspect of the present invention, there is provided a method of reporting a GCID of a mobile station in a mobile communication system, the method comprising: transmitting a PCID received from a target base station to a serving base station; Receiving a GCID from the target BS, receiving a system ID of the target BS during the gap, acquiring the GCID from the system information, and transmitting the GCID to the serving BS, To the base station.

According to a third aspect of the present invention, there is provided a serving base station apparatus allocating a gap in a mobile communication system, the communication system comprising: a communication module for communicating with another node; If it is difficult to acquire unique cell information such as a GCID through the mapping information between the PCID and the GCID, it is possible to obtain the broadcast period and the viewpoint of the neighbor base station with respect to the PCID, And a controller for allocating a gap to allow the terminal to receive the GCID during a system information broadcast time and a broadcast section, receiving a message transmitted by the terminal, and obtaining a GCID from the message.

According to a fourth aspect of the present invention, there is provided a device for allocating a gap in a mobile communication system, the communication device comprising: a communication module for communicating with another node; To the serving base station, allocates a gap to receive the GCID from the serving base station during a GCID transmission time and transmission interval for the PCID, receives system information of the target base station during the gap, And a controller for obtaining the GCID from the serving BS and transmitting the GCID to the serving BS.

The present invention has the advantage of reducing the time required for the UE to acquire the GCID by adjusting the gap interval for acquiring the GCID in the mobile communication system, thereby improving the performance.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. In the following description, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

Hereinafter, the present invention will be described in terms of an apparatus and method for efficiently acquiring neighboring base station information in a mobile communication system.

The method includes determining a starting point of a gap interval for the MS based on information received from a neighbor BS by the serving BS when the MS detects the PCID of the neighbor BS, And informing the base station of the SIB information when the SIB information is received from the adjacent cell.

1 is a diagram illustrating a process in which a base station of a femtocell acquires information of an adjacent base station through an Over The Air Receiver (OTAR) function according to the present invention.

Referring to FIG. 1, a procedure for acquiring information of neighboring base stations 100, 110, 115, 150, 155, and 160 is performed by a small base station 120 such as a femto cell base station through an OTAR function .

If the neighbor base stations 100, 110, 115, 150, 155, and 160 know the period of broadcasting the system information and the time of last broadcasting even if it is an asynchronous system, The starting point can be determined by reference.

When the OTAR function is used, the small base station 100 temporarily operates as a terminal and can periodically acquire information of other base stations.

2 is a diagram illustrating signaling and communication disconnection intervals between a Node B and a UE according to an embodiment of the present invention.

2, the serving base station SeNB transmits a message "SIB1 broadcast info. REQ" to a base station (TENB) of a neighboring cell and receives a response to acquire SIB1 period of the neighboring cell and the latest SIB1 sending time .

When receiving a signal of a base station of the neighboring cell, the terminal transmits a measurement report message including the fact and information included in a signal of a base station of the neighboring cell to the serving base station, and reports the measurement report message to the serving base station.

When the serving BS can not grasp the target BS in the signal received by the serving BS, the serving BS transmits the SIB1 broadcast info. REQ message to the target BS and receives the SIB1 broadcast info. RSP message in response. The serving BS acquires information on the target BS in the SIB1 broadcast info. RSP message, acquires the SIB1 period of the target BS and the latest SIB1 sending time point based on the information, allocates a gap to the MS do.

The serving base station may acquire information acquired in the "SIB1 broadcast info. RSP" message in advance through OTAR. Based on the information, the serving base station predicts at which time the target base station to perform the measurement will broadcast the system information and allocates the gap to the terminal.

Upon acquiring the system information of the target cell during the allocated gap, the UE informs the serving base station that the measurement is completed and notifies the measurement completion message to complete the gap interval, and proceeds to the next step. The serving BS can determine whether to perform a handover to the MS according to the received measurement result.

3 is a flowchart illustrating an operation procedure of a UE according to an embodiment of the present invention.

Referring to FIG. 3, the MS receives the system information transmitted by the target BS. Upon detecting the PCID in the system information, the MS transmits a "measurement report" message including the system ID to the serving BS in step 310.

Thereafter, the UE is allocated a gap from the serving BS (step 315), receives the system information SIB1 of the target BS during the gap, and obtains the GCID information.

The MS can continue the process until receiving the system information (steps 315 and 320).

Upon completion of reception of the system information for the target BS, the MS includes the measurement completion message (or signal) and transmits the measurement completion message (or signal) to the serving BS in step 325.

Thereafter, the algorithm according to the present invention terminates.

4 is a flowchart illustrating an operation of a base station according to an embodiment of the present invention.

4, the serving BS receives the measurement result from the MS in step 410, and if the PCID included in the measurement result is reused in step 415, that is, if the PCID is reused and the unique If it is difficult to acquire the cell information through the mapping information between the PCID and the GCID, the system information (SIB1) broadcasting cycle and the time point of the neighbor base station for the PCID are obtained (step 417). The serving base station may acquire such information in advance as described above.

In step 420, the serving BS allocates a gap to the MS so that the MS can acquire the GCID at a system information broadcasting period and a time point of the neighbor BS, that is, the neighbor BS with respect to the PCID. That is, a gap is allocated to acquire the GCID based on SIB1 information. At this time, the serving BS can determine a gap start point based on the system information broadcasting period and broadcasting time of the target base station that has already been acquired.

After completing the measurement of the target base station through the gap, the terminal transmits a measurement completion message (signal), and the serving base station receives the measurement completion message (step 430). In step 430, In step 435, it is determined whether the base station is a base station for the femtocell to which the terminal can access based on the GCID information. If a handover is required, the mobile station performs a handover process for the mobile station in step 440, and if no handover is required, the mobile station continues to communicate with the mobile station in step 445.

If the PCID included in the measurement result is not reused (step 415), the serving BS acquires the GCID of the PCID from the mapping table (information) of the PCID and GCID stored in the database of the serving base station (step 425 (Step 435). In step 435, it is determined whether the handover is necessary.

Thereafter, the algorithm according to the present invention terminates.

5 is a block diagram of a terminal according to an embodiment of the present invention.

5, the terminal includes a communication module 510, a control unit 520, a storage unit 530, and a system information management unit 540.

The communication module 510 is a module for communicating with other nodes, and includes a radio processing unit and a baseband processing unit. The radio processor converts the signal received through the antenna into a baseband signal and provides the baseband signal to the baseband processor. The baseband processor converts the baseband signal from the baseband processor into a radio signal for transmission over an actual radio path, Lt; / RTI >

The controller 520 controls the overall operation of the terminal. In particular, the system information management unit 540 is controlled according to the present invention.

The storage unit 530 stores a program for controlling the overall operation of the terminal and temporary data generated during program execution.

The system information management unit 540 receives the system information transmitted by the target BS, and when it detects the PCID in the system information, transmits the 'measurement report' message including the PCID to the serving BS. Thereafter, the system information management unit 540 receives the system information SIB1 of the target base station during the gap, and obtains the GCID information from the serving BS. The system information management unit 540 may continue the process until the system information reception is completed.

When the system information management unit 540 completes the reception of the system information for the target base station, the system information management unit 540 transmits the measurement result message (or signal) to the serving base station.

In the above-described block configuration, the control unit 520 may perform the functions of the system information management unit 540. In the present invention, these are separately constructed and described in order to describe each function separately.

Therefore, when the product is actually implemented, the control unit 520 may process all the functions of the system information management unit 540, or may be configured to process only a part of the functions in the control unit 520 .

6 is a block diagram of a base station according to an embodiment of the present invention.

6, the base station includes a communication module 610, a control unit 620, a storage unit 630, and a gap management unit 640.

The communication module 610 is a module for communicating with other nodes, and includes a wireless processing unit, a wireless baseband processing unit, a wire processing unit, and a wired baseband processing unit.

The radio processor converts the radio signal received through the antenna into a baseband signal and supplies the baseband signal to the radio baseband processor. The radio baseband processor converts the baseband signal into a radio signal for transmission over an actual radio path Through the antenna.

The wired processing unit converts the signal received through the wired path into a baseband signal and provides the baseband signal to the wired baseband processing unit. The wired processing unit changes the baseband signal from the wired baseband processing unit to a wired signal so that the baseband signal can be transmitted on the actual wired path And transmits through the wired path.

The controller 620 controls the overall operation of the terminal. In particular, the gap management unit 640 is controlled according to the present invention.

The storage unit 630 stores a program for controlling the overall operation of the terminal and temporary data generated during the execution of the program.

When the PCID included in the measurement result is reused, that is, when the PCID is reused, unique gap information such as GCID is transmitted to the gap management unit 640 through mapping information between the PCID and the GCID If it is difficult to obtain the system information (SIB1) of the neighbor base station with respect to the PCID, a broadcasting cycle and a time point are obtained. The gap management unit 640 may acquire such information in advance as described above.

The gap manager 640 allocates a gap to the MS so that the MS can acquire the GCID at a system information broadcasting period and a time point of the neighbor base station, i.e., a neighbor BS with respect to the PCID. That is, a gap is allocated to acquire the GCID based on SIB1 information. At this time, the gap manager 640 may determine a gap start point based on the system information broadcasting period and broadcasting time of the target base station that has already been acquired.

After the UE completes the measurement for the target base station through the gap, the UE transmits a measurement completion message (signal), and the gap management unit 640 receives the measurement completion message and outputs the GC ID Based on the information, whether or not the base station is a base station for the femtocell to which the terminal can access. If a handover is required, the mobile station performs a handover process for the mobile station, and continues communication with the mobile station when handover is not required.

If the PCID included in the measurement result is not reused, the gap management unit 640 obtains the GCID for the PCID from the mapping table (information) of the PCID and the GCID stored in the database of the storage unit 630, And performs a process from the step of checking whether the mobile station needs handover.

In the above-described block configuration, the controller 520 may perform the function of the gap manager 640. In the present invention, these are separately constructed and described in order to describe each function separately.

Accordingly, in actual implementation of the product, the controller 520 may be configured to process all of the functions of the gap manager 640, and the controller 520 may process only a part of the functions.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but is capable of various modifications within the scope of the invention. Therefore, the scope of the present invention should not be limited by the illustrated embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

FIG. 1 is a diagram illustrating a process in which a base station of a femto cell acquires information of an adjacent base station through an Over The Air Receiver (OTAR) function according to the present invention;

2 is a diagram illustrating signaling and communication disconnection intervals between a Node B and a UE according to an embodiment of the present invention;

3 is a flowchart illustrating an operation procedure of a terminal according to an embodiment of the present invention.

4 is a flowchart illustrating an operation of a base station according to an embodiment of the present invention.

5 is a block diagram of a terminal according to an embodiment of the present invention,

6 is a block diagram of a base station according to an embodiment of the present invention;

Claims (4)

A gap allocation method of a serving base station in a mobile communication system, The method comprising the steps of: the serving base station acquiring a system information broadcasting cycle and a time point of neighbor base stations; When the PCID detected by the MS and transmitted to the serving BS is reused and it is difficult to obtain unique cell information such as a general cell ID (GCID) through the mapping information between the PCID and the GCID, Allocating a gap to allow the terminal to receive the GCID during a system information broadcast time and a broadcast period of the base station; A process of receiving a message transmitted by the terminal; And obtaining a GCID from the message. A method for reporting a GCID of a terminal in a mobile communication system, Transmitting a PCID received from the target base station to the serving base station; Receiving a gap from the serving BS to receive the GCID during a GCID transmission time and a transmission interval for the PCID; Receiving system information of the target base station during the gap; Obtaining the GCID from the system information; And transmitting the GCID to the serving BS. An apparatus of a serving base station allocating a gap in a mobile communication system, A communication module for communicating with another node, Acquires the system information broadcasting period and time point of the neighbor BSs through the communication module and acquires the unique cell information such as the GCID through the mapping information between the PCID and the GCID because the PCID sensed by the MS and transmitted to the serving BS is reused In case of difficulty, a gap is allocated to allow the MS to receive the GCID during a system information broadcast time and a broadcast interval of the neighbor BS with respect to the PCID, a message transmitted from the MS is received, and a GCID is acquired from the message And a control unit. An apparatus of a terminal allocating a gap in a mobile communication system, A communication module for communicating with another node, Wherein a gap is allocated to receive the GCID from the serving base station during the GCID transmission time and transmission interval for the PCID from the serving base station through the communication module, And a controller for receiving the system information of the base station, obtaining the GCID from the system information, and transmitting the GCID to the serving base station.

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