KR102083582B1 - Method for automatic neighbor relation using mobile terminal in inactive state, and base station for mobile communication applying same - Google Patents

Abstract

According to an embodiment of the present invention, in order to obtain information of a cell adjacent to a cell of a base station, an automatic neighbor relation (ANR) method performed by the base station includes a user plane with the base station. Identifying a terminal in an inactive state in which a connection through the control plane with the base station is maintained, but the connection through the control plane is maintained, the at least one target terminal selected from the identified terminals; Transitioning the connection through the user plane with the base station to an active wireless connection state and based on state information received from at least one of the adjacent cells through the target terminal in the wireless connection state, The method may include updating previously stored neighbor cell status information about the state.

Description

ANR method using an inactive terminal, and a mobile communication base station to which the method is applied {METHOD FOR AUTOMATIC NEIGHBOR RELATION USING MOBILE TERMINAL IN INACTIVE STATE, AND BASE STATION FOR MOBILE COMMUNICATION APPLYING SAME}

The present invention provides a mobile communication environment capable of transitioning a state of a terminal to an inactive state, comprising: a method for acquiring information of a neighbor cell by using the terminal transitioned to an inactive state; A communication base station.

With the improvement of living standards and the development of information and communication technology, the vast majority of people are receiving mobile communication service through personal mobile communication terminals such as smartphones. In addition, contents that can be used through such a mobile communication terminal are also getting higher day by day. Accordingly, there is an increasing demand for high quality mobile communication services having higher speed and reliability. In order to meet such demands, research on more advanced mobile communication technologies such as 5G (5-generation) new radio (NR) system has been actively conducted.

During the mobile communication service, a reason why the terminal is difficult to receive the service from the current serving base station may occur. For example, the terminal may move from the service space of the current serving base station to the service space of another adjacent base station. In this case, a handover (HO) procedure needs to be performed so that the terminal can receive the service currently received from the serving base station as it is and then receive it from the other base station.

However, for this purpose, it is necessary for a serving base station that provides a wireless connection to a current terminal to accurately grasp the information of a neighboring cell at all times. For example, if the base station has not obtained information on the expansion or reduction of the neighbor cell, the handover success rate for connecting the terminal to another base station is inevitably lowered due to incorrect information.

Korean Laid-Open Patent Publication No. 10-2012-0049807 (published May 17, 2012)

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for quickly and accurately obtaining updated neighbor cell information and a mobile communication base station to which the method is applied in order to provide a high quality mobile communication service to a terminal at any time. will be.

However, the problem to be solved by the present invention is not limited to those mentioned above, another problem to be solved is not mentioned can be clearly understood by those skilled in the art from the following description. will be.

According to an embodiment of the present invention, in order to obtain information of a cell adjacent to a cell of a base station, an automatic neighbor relation (ANR) method performed by the base station includes a user plane with the base station. Identifying a terminal in an inactive state in which a connection through the control plane with the base station is maintained, but the connection through the control plane is maintained, the at least one target terminal selected from the identified terminals; Transitioning the connection through the user plane with the base station to an active wireless connection state and based on state information received from at least one of the adjacent cells through the target terminal in the wireless connection state, The method may include updating previously stored neighbor cell status information about the state.

According to an embodiment of the present invention, a base station performing information acquisition of an adjacent cell is inactive while the connection through the user plane with the base station is released, but the connection through the control plane with the base station is maintained. A terminal identification unit for identifying a terminal in a state, a connection setting unit for transitioning at least one target terminal selected from the identified terminals to a wireless connection state in which connection through the user plane with the base station is activated, and the wireless connection The controller may be configured to update previously stored neighbor cell state information on the state of the neighbor cell based on the state information received from at least one of the neighbor cells through the target terminal in the state.

According to an embodiment of the present invention, an inactive state having an intermediate characteristic between a wireless connection state and an idle state is introduced, and neighbor cell information is automatically reported to a base station by using such an inactive terminal. can do. As a result, information of neighbor cells can be always kept up to date, and ultimately, an optimal mobile communication service can be always provided to a user.

1 is a view for explaining a mobile communication system according to an embodiment of the present invention.
2 is a diagram illustrating a state that a terminal may have and a transition between the states according to an embodiment of the present invention.
3 is a diagram illustrating a configuration of a mobile communication base station to which an ANR method using an inactive terminal according to an embodiment of the present invention is applied.
4 is a diagram illustrating each step of an ANR method using an inactive terminal according to an embodiment of the present invention.

Advantages and features of the present invention, and methods for achieving them will be apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be embodied in various different forms, and the present embodiments merely make the disclosure of the present invention complete, and those of ordinary skill in the art to which the present invention belongs. It is provided to fully inform the person having the scope of the invention, which is defined only by the scope of the claims.

In describing the embodiments of the present invention, if it is determined that a detailed description of a known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, terms to be described below are terms defined in consideration of functions in the embodiments of the present invention, which may vary according to intentions or customs of users and operators. Therefore, the definition should be made based on the contents throughout the specification.

1 is a view for explaining a mobile communication system according to an embodiment of the present invention. The mobile communication system 10 of FIG. 1 is a system for providing a mobile communication service to a subscriber through a mobile communication terminal, and may be a system based on a mobile communication protocol such as 5G NR introduced in the introduction, but is not limited thereto. Do not.

The mobile communication system 10 may include a plurality of base stations (eNodeBs). Each base station may provide a wireless communication connection for a mobile communication service to a terminal in a cell corresponding to a service range. Hereinafter, the present invention will be described with reference to a specific base station 100 to which the technology according to an embodiment of the present invention is applied among the plurality of base stations.

As shown in FIG. 1, a plurality of neighboring base stations adjacent to each other may exist in the vicinity of the base station 100. For example, the cell 101 of the base station 100 and the cell 301 of the adjacent base station 300 may exist adjacent to each other spatially. Hereinafter, the cell 301 of the neighbor base station 300 may be collectively referred to as the "adjacent cell".

As described at the outset, the base station 100 needs to keep the information on the establishment, change, and demolition of such adjacent base stations always up to date. In order to maintain such information up-to-date, the base station 100 may use the terminal 200 existing in the cell managed by the base station 100. That is, the terminal 200 has the base station 100 as a serving base station, and is a terminal that receives a mobile communication service through a wireless connection with the base station 100.

Recently, the concept of self-organization networks (SON) has been introduced to reduce costs incurred during the construction and operation of the initial network of network operators. In this regard, a function called an automatic neighbor relation (ANR) is performed, which automatically configures and updates a neighboring relation table (NRT), which is neighbor cell state information held by the base station 100, using the terminal 200. Function. Through this ANR function, the burden of manually updating the NRT whenever there is a change in an adjacent cell can be alleviated.

ANR operation according to an embodiment of the present invention may include an ANR for an adjacent cell of the same intra-frequency, an ANR for an adjacent cell of different inter-frequency, and a different radio communication protocol. The ANR of the neighbor cell of the RAT may be possible, and the type of ANR operation to be performed by each terminal 200 in a wireless connection state may include operation preference setting information set by the base station 100 and the terminal 200. ) May be determined using context information.

The base station 100 using the ANR function relates to a neighbor cell to be performed by the terminal 200 through an RRC reconfiguration procedure during a call connection process for the terminal 200 by initial call connection or handover. Measurement conditions can be set for measurement and measurement report (MR) transmission. When the predetermined neighbor cell measurement condition is satisfied (eg, when the RSRP of the base station 100 is lower than a predetermined threshold value), the terminal 200 performs the neighbor cell measurement operation, and measures the measured neighbor cell signal information and the base station ( If the signal information of 100) satisfies the A3 event condition, the PCI (Physical Cell ID), RSRP / RSRQ information, etc. of the neighbor cell may be transmitted to the base station 100 through the measurement report message.

When the base station 100 detects an adjacent cell that does not exist in its NRT among the received PCI information, an E-UTRAN cell global identifier (ECGI) and a tracking area of the corresponding cell required to register the neighbor cell to the NRT. code) and RRC reconfiguration procedure for acquiring public land mobile network (PLMN) ID information. In this procedure, the base station 100 enters the UE into a discontinuous reception (DRX) section in order for the terminal 200 to temporarily suspend uplink / downlink packet communication with the base station 100. You can. The terminal 200 acquires ECGI, TAC, and PLMN information included in a message (MIB / SIB1 / SIB2) broadcasted by a neighbor cell during the DRX period, and measures the corresponding information by the base station 100 in a measurement report message. You can send it in

The base station 100 uses the information received from the terminal 200 and the information obtained through a transport network layer (TLN) look-up procedure, newly registers a corresponding neighbor cell to an NRT, and X2 with the neighbor cell. If I / F (Interface) setting is necessary, X2 I / F may be established between the base station 100 and the base station of the neighboring cell by using the obtained TNL address information.

On the other hand, in order to achieve the above object, according to the mobile communication system 10 according to an embodiment of the present invention, in addition to the radio connection state and the idle state described above, radio resource control (RRC) inactive state having its intermediate characteristics (RRC inactive state, hereinafter abbreviated as "inactive state") can be introduced.

In the inactive state, data communication (more specifically, data transmission through a user plane) is not performed between the base station 100 and the terminal 200 through a wireless channel. However, the mobile communication system 10, more specifically, the core network (not shown) and the base station 100 of the mobile communication system 10 retain and manage connection information related to the control plane and the user plane for the corresponding terminal 200. can do. That is, in the inactive state, the mobile communication system 10 may maintain and manage an access stratum (AS) context for the corresponding terminal 200.

In short, the inactive state is similar to the idle state in that the connection through the user plane is released, but similar to the wireless connection state in that the connection through the control plane is maintained. Such an inactive state can achieve the original purpose of the idle state as described above, and still maintain the connection with the terminal 200 on the mobile communication system 10 side. According to this, the existence and the current state of the terminal 200 can be easily grasped, and if the terminal 200 can be quickly shifted to a wireless connection state if necessary, ultimately, a faster mobile communication service is provided to the terminal 200 user. It can be provided.

In particular, in order to perform the ANR method according to an embodiment of the present invention, that is, the method of automatically acquiring the state information of the neighboring base station and updating the existing information, information exchange between the terminal 200 and the base station 100 is required. As a result, the ANR method is difficult to be performed by the terminal in the idle state. For this reason, in an embodiment of the present invention, the state information of the neighbor base station may be obtained using the terminal 200 in an inactive state.

Meanwhile, in relation to retaining connection information of the terminal 200 in an inactive state, similar to a conventional paging area, a radio access network (RAN) -based notification area to which one or more base stations may belong. The concept of) can be defined. Thus, an RNA may be one base station, but may be a group of two or more base stations. The terminal 200 may obtain information of an RNA to which it belongs through an RRC reconfiguration procedure during a call connection process.

In addition, the terminal 200 in an inactive state can camp to a cell of a better wireless environment during a paging discontinuous reception (DRX) operation. After performing the camping operation, the terminal 200 compares the RNA information of the corresponding cell 301 included in the SI information broadcasted by each cell with its current RNA information, and whether the two have changed. In this case, the terminal 200 may perform an RNA update operation informing the currently camped cell 101 that its RNA information has been changed. By this operation, the AS context of the terminal 200 may be fetched to the currently camped cell.

2 is a diagram illustrating a state that a terminal may have and a transition between the states according to an embodiment of the present invention. 2, in the state of the terminal 50, the total of the transition (①) between the wireless connection state and the inactive state, the transition between the wireless connection state and the idle state (②) and the transition between the inactive state and the idle state (③) It can be seen that three types of transitions are possible. Note that the transition between the inactive state and the idle state is asymmetrical, so that the transition from the inactive state to the idle state is possible but not immediately in the opposite direction. Accordingly, if the terminal 50 wants to transition from the idle state to the inactive state, it is necessary to transition through the wireless connection state in the middle.

3 is a diagram illustrating a configuration of a mobile communication base station to which an ANR method using an inactive terminal according to an embodiment of the present invention is applied. The base station 100 of FIG. 3 may include a communication unit 110, a terminal identification unit 120, a connection setting unit 130, and a control unit 140. Among the above components, the terminal identification unit 120, the connection setting unit 130, and the control unit 140 may include a computing device such as a microprocessor, and the communication unit 110 may be configured to transmit and receive data. / Wireless communication devices, and the like. Hereinafter, an operation of each component of the mobile communication device 100 will be briefly described with reference to FIG. 3, and a detailed description thereof will be made with reference to FIG. 4 below.

The communication unit 110 may transmit and receive data with a terminal or another configuration of the mobile communication system 10 (eg, a core network (not shown) of the mobile communication system 10). For example, the communication unit 110 may receive the information from the terminal 200 that has received information broadcast by another adjacent base station. If other components of the base station 100 to be described below to exchange information with the outside of the base station 100, the corresponding information may be exchanged via the communication unit 110.

The terminal identification unit 120 may identify the terminal in the inactive state as described above among the terminals existing in the cell of the base station 100.

The connection setting unit 130 may select at least one of the terminals as a target terminal. Such a target terminal indicates a terminal to be used by the base station 100 to obtain state information of a neighbor cell, and a detailed method of selecting the target terminal will be presented below. After selecting the target terminal, the connection setting unit 130 may restore the connection through the user plane between the base station and the target terminal, and transition the inactive target terminal to the wireless connection state.

The control unit 140 may receive state information broadcast by at least one base station of the adjacent cells through the target terminal transitioned to the wireless connection state by the connection setting unit 130. In addition, the controller 140 may update the pre-stored neighbor cell state information of the states of each cell adjacent to the cell of the base station 100 using the received state information.

4 is a diagram illustrating each step of an ANR method using an inactive terminal according to an embodiment of the present invention. The method of FIG. 4 may be performed by the base station 100 described with reference to FIG. 3. However, since the method shown in FIG. 4 is only an embodiment of the present invention, the spirit of the present invention is not limitedly interpreted by FIG. 4, and each step of the method shown in FIG. Of course, it can be performed in a different order. In addition, detailed descriptions of what is overlapped with FIGS. 1 to 3 may be omitted.

First, the terminal identification unit 120 may identify a terminal in an inactive state among the terminals within the service range of the base station 100 (S110). Then, the connection setting unit 130 may select a target terminal from the identified terminals (S120). That is, not all of the identified inactive terminals are used to obtain status information of neighboring base stations, but only target terminals selected by the connection setting unit 130 according to a predetermined criterion.

The connection setting unit 130 may transition the target terminal to a radio connection (RRC connected) state (S130). The target terminal may receive state information received from at least one of the cells adjacent to the cell of the base station 100, and the controller 140 may receive the state information from the target terminal (S140). The state information may be broadcast from the base station of each adjacent cell, and the detailed process of transmitting and receiving such state information has been described above. The controller 140 may update neighboring cell status information (eg, the NRT described above) stored for the state of each cell adjacent to the cell of the base station 100 (S150).

Such an ANR method according to an embodiment of the present invention may be operated at all times, but may be operated only within a preset operating time in units of years / months / days / hours. For example, operating from 2:30:45 am to 4:50:25 am daily, and operating from December 6, 2017, 00:00:00 to January 5, 2018, 23:59:59 Can be selected.

Hereinafter, the details of the ANR method according to an embodiment of the present invention will be described in more detail. According to an embodiment of the present invention, the ANR method can be operated in three ways.

1. Periodic ANR  Operation technique

According to the present technique, the connection setting unit 130 of the base station 100 periodically selects a target terminal, transmits a paging message to the target terminal, transitions to a wireless connection state, and receives state information. The target terminal may be returned to the inactive state.

According to this, the controller 140 may start a count of a periodic timer of a predetermined length after the update ends, and may resume the steps S110 to S150 when the count of the periodic timer expires (S160). That is, according to this, the ANR method is performed in a period equal to the length of the periodic timer, and the count expiration of the periodic timer has a meaning as a kind of restart condition. The length of the periodic timer may be appropriately set such that conditions such as performance optimization of the ANR method and minimization of burden on the base station 100 may be achieved.

Separately, of course, the control unit 140 may deactivate the performance of the ANR method based on the operation of the operator of the mobile communication system 10, in which case the execution of the periodic ANR method is stopped (S170).

Meanwhile, the connection setting unit 130 may select a predetermined ratio or a predetermined number of terminals among the identified terminals as the target terminals. Such a ratio or number may be determined based on the terminal capacity of the base station 100 (for example, the total number of terminals that can be accommodated by the base station 100 or the number of inactive terminals).

In addition, the controller 140 may set a restartable time for each terminal in the cell. Accordingly, the terminal selected as the target terminal is not selected as the target terminal again before the restartable time elapses. To this end, the controller 140 may drive a restart timer having the same length as the restartable time. If the length of the restart timer is 0, the terminal can be selected as the target terminal at all times. If the terminal is infinite, the terminal is not selected as the target terminal again after being selected as the target terminal.

In some cases, however, the ANR method should be started again due to the expiration of the periodic timer, and the restart timer of all terminals (or most terminals) in the cell of the base station 100 may not be expired and thus may be selected as a target terminal. There may be no terminal (or lack thereof). In this case, it is also possible to arrange the terminals in a shorter order until the expiration of the restart timer, and then select as many target terminals as necessary in the sorted order.

The length of the restart timer may be set differently according to the type of the terminal. This is because the characteristics of the terminal such as power consumption may be different for each type of terminal, in order to more efficiently operate the ANR method in consideration of the characteristics of the individual terminal.

An exemplary criterion for selecting a target terminal of the connection setting unit 130 will now be described. The connection setting unit 130 may select, as the target terminal, a predetermined number or a predetermined ratio of terminals in a long order from the time point that was previously selected as the target terminal among the terminals identified in the cell of the base station 100. have. Alternatively, the connection setting unit 130 may select a predetermined ratio or a predetermined number of terminals among the identified terminals by using a random variable for each time point of selecting a target terminal. The random variable may be due to a uniform distribution or may be due to a normal distribution.

The connection setting unit 130 may select all of the identified terminals as the target terminals, if the number of identified terminals M is less than or equal to the number N of target terminals to be selected. However, if the value of M exceeds the value of N, 1) First, M terminals among the identified terminals are placed in intervals having a size of 1 / M between 0 and 1, respectively, and are generated using a uniform distribution probability variable. The terminal of the section including any number between 0 and 1 is selected as the first target terminal, and 2) the next M-1 terminals have a size of 1 / (M-1) between 0 and 1 The terminals of the sections including random numbers between 0 and 1 generated by using the uniform distribution probability variables may be selected as the second target terminals. In addition, by repeating the same process for the remaining terminals, finally, M-N + 1 terminals are finally arranged in intervals having a size of 1 / (M-N + 1) between 0 and 1, and are uniformly distributed. The terminal of the section including any number between 0 and 1 generated using the random variable may be selected as the N-th target terminal.

The controller 140 may determine the type of ANR operation to be performed by the corresponding target terminal for each of the selected target terminals. This type of operation is, as described above, ANRs for neighboring cells of the same frequency (intra-frequency), ANRs for neighboring cells of different inter-frequency, and neighboring of different inter-RATs. ANR for a cell, etc. can be mentioned. The type of operation may be determined according to the information on the ANR operation supported by the corresponding target terminal included in the context information of each target terminal and the operation preference setting information set by the base station 100.

The controller 140 determines a type of ANR operation supported by the corresponding target terminal for each target terminal, sets a section for each supported ANR operation, and corresponds to a section including an arbitrary number generated by a random variable. It can be specified to perform the ANR operation. For example, if the terminal supports all three ANR operations and the operation priority parameters for each ANR operation are A, B, and C, respectively, the three ANR operations are divided into a numbered range of 0 to 1, respectively. Occupy, but each of 0 to A / (A + B + C), A / (A + B + C) to (A + B) / (A + B + C), and (A + B ) / (A + B + C) to 1 can be divided and occupied. If the value of the number produced by the uniformly distributed random variable is A / (2 (A + B + C)), the first type of ANR operation occupies the interval from 0 to A / (A + B + C). Will be chosen.

2. According to the RNA change of the terminal ANR  Operation technique

When the UE of the inactive state is recognized that the change of the RNA to which it belongs, it can request a state transition for the serving base station so that the current new serving base station can hold its own terminal context. It is assumed here that the base station 100 is a new serving base station. Then, the connection setting unit 130 of the base station 100 transitions the terminal entering the cell of the base station 100 to a wireless connection state and then performs the state information reporting operation of the neighboring cell, and returns to the inactive state again. You can.

This technique utilizes the fact that a terminal performing RNA modification needs to be transitioned to a wireless connection state. That is, the terminal performing the RNA change is to use the opportunity to transition to the wireless connection state to the terminal to obtain and report the state information of the adjacent cell, and selecting the terminal performing the RNA change as the target terminal and In fact the same.

On the other hand, the base station 100 for the terminal newly entered into the cell, the setting regarding the selection to the target terminal as described above (for example, if you do not want to select the target terminal, the length of the restart timer is set to infinity Can be set), ANR operation type setting, etc. (it is a redundant description and thus will not be described in detail here).

3. During the RNA reporting procedure of the terminal ANR  Operation technique

The inactive terminal may operate its own timer to notify its current serving base station when the timer expires. It is assumed here that the base station 100 is a serving base station. Then, the connection setting unit 130 of the base station 100 may perform the state information reporting operation of the neighbor cell after transitioning the terminal to the wireless connection state, and may return to the inactive state again.

On the other hand, the base station 100 when the new terminal receives a message for notifying its existence by the timer (that is, when there is a change or update of the RNA from the terminal point of view), to the target terminal as described above Settings regarding selection, setting of the ANR operation type, etc. can be performed (it is redundant description and thus will not be described in detail here).

According to one embodiment of the present invention described above, the terminal state transition control to the inactive state and the automatic acquisition of neighbor cell information using the terminal in the inactive state, the information of the neighboring cell can always be kept up to date Ultimately, it is possible to always provide an optimal mobile communication service to the user.

Combinations of each block of the block diagram and each step of the flowchart attached to the present invention may be performed by computer program instructions. These computer program instructions may be embedded in an encoding processor of a general purpose computer, special purpose computer, or other programmable data processing equipment such that the instructions executed by the encoding processor of the computer or other programmable data processing equipment may be executed in each block or block diagram. It will create means for performing the functions described in each step of the flowchart. These computer program instructions may also be stored in a computer usable or computer readable memory that can be directed to a computer or other programmable data processing equipment to implement functionality in a particular manner, and thus the computer usable or computer readable memory. The instructions stored therein may also produce an article of manufacture containing instruction means for performing the functions described in each block or flowchart of each step of the block diagram. Computer program instructions may also be mounted on a computer or other programmable data processing equipment, such that a series of operating steps may be performed on the computer or other programmable data processing equipment to create a computer-implemented process to create a computer or other programmable data. Instructions that perform processing equipment may also provide steps for performing the functions described in each block of the block diagram and in each step of the flowchart.

In addition, each block or step may represent a portion of a module, segment, or code that includes one or more executable instructions for executing a specified logical function (s). It should also be noted that in some alternative embodiments, the functions noted in the blocks or steps may occur out of order. For example, the two blocks or steps shown in succession may in fact be executed substantially concurrently, or the blocks or steps may sometimes be performed in the reverse order, depending on the functionality involved.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential quality of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas falling within the equivalent scope of the present invention should be construed as being included in the scope of the present invention.

According to an embodiment of the present invention, as the terminal state transition control to the inactive state and automatic acquisition of neighbor cell information using the terminal in the inactive state can be performed, the information of the neighbor cell can always be kept up to date, and ultimately As a result, an optimal mobile communication service can be always provided to the user.

10: mobile communication system
100: base station
110: communication unit
120: terminal identification unit
130: connection setting unit
140: control unit
200: terminal
300: adjacent base station

Claims (10)

delete delete An automatic neighbor relation (ANR) method performed by the base station for obtaining information of a cell adjacent to a cell of a base station,
Identifying a terminal in an inactive state in which a connection through a user plane with the base station is released but a connection through a control plane with the base station is maintained;
Transitioning at least one target terminal selected from the identified terminals to a wireless connection state in which connection through the user plane with the base station is activated;
Updating previously stored neighbor cell state information on a state of the neighbor cell based on state information received from at least one of the neighbor cells through the target terminal in the radio connection state; And
Starting a count of a timer of a predetermined length after completion of the updating step,
The identifying step is performed when the count of the timer expires.
ANR method using an inactive terminal. An automatic neighbor relation (ANR) method performed by the base station for obtaining information of a cell adjacent to a cell of a base station,
Identifying a terminal in an inactive state in which a connection through a user plane with the base station is released but a connection through a control plane with the base station is maintained;
Transitioning at least one target terminal selected from the identified terminals to a wireless connection state in which connection through the user plane with the base station is activated; And
Updating, based on state information received from at least one of the adjacent cells, the previously stored neighbor cell state information on the state of the adjacent cell through the target terminal in the wireless connection state;
Each of the identified terminals has a corresponding predetermined restartable time, and is not selected again as the target terminal until the restartable time elapses from when it is selected as the target terminal.
ANR method using an inactive terminal. The method of claim 4, wherein
The restartable time is set based on the type of each terminal.
ANR method using an inactive terminal. An automatic neighbor relation (ANR) method performed by the base station for obtaining information of a cell adjacent to a cell of a base station,
Identifying a terminal in an inactive state in which a connection through a user plane with the base station is released but a connection through a control plane with the base station is maintained;
Transitioning at least one target terminal selected from the identified terminals to a wireless connection state in which connection through the user plane with the base station is activated; And
Updating, based on state information received from at least one of the adjacent cells, the previously stored neighbor cell state information on the state of the adjacent cell through the target terminal in the wireless connection state;
The transitioning includes selecting a predetermined ratio or a predetermined number of terminals as the target terminal from the identified terminals.
The predetermined ratio and the predetermined number are determined based on the terminal capacity of the base station.
ANR method using an inactive terminal. An automatic neighbor relation (ANR) method performed by the base station for obtaining information of a cell adjacent to a cell of a base station,
Identifying a terminal in an inactive state in which a connection through a user plane with the base station is released but a connection through a control plane with the base station is maintained;
Transitioning at least one target terminal selected from the identified terminals to a wireless connection state in which connection through the user plane with the base station is activated; And
Updating, based on state information received from at least one of the adjacent cells, the previously stored neighbor cell state information on the state of the adjacent cell through the target terminal in the wireless connection state;
The transitioning step includes selecting, as the target terminal, a predetermined number or a predetermined ratio of terminals in a long order of elapsed time from the time point of selecting the target terminal among the identified terminals.
ANR method using an inactive terminal. An automatic neighbor relation (ANR) method performed by the base station for obtaining information of a cell adjacent to a cell of a base station,
Identifying a terminal in an inactive state in which a connection through a user plane with the base station is released but a connection through a control plane with the base station is maintained;
Transitioning at least one target terminal selected from the identified terminals to a wireless connection state in which connection through the user plane with the base station is activated; And
Updating, based on state information received from at least one of the adjacent cells, the previously stored neighbor cell state information on the state of the adjacent cell through the target terminal in the wireless connection state;
The transitioning includes selecting a predetermined ratio or a predetermined number of terminals among the identified terminals by using a random variable each time the transitioning step is performed.
ANR method using an inactive terminal. delete delete

Images