KR102058428B1 - Access apparatus, terminal apparatus, and cell list registering method thereof - Google Patents

Abstract

The present invention relates to an access device capable of automatically configuring a cell list for supporting dual connectivity from a 4G base station, which is a master node, to a 5G base station, which is a secondary node, and a cell list registration method of the access device, in relation to an operation of dual access (EN-DC, E-UTRAN new radio dual connectivity) in a 5G non-standalone (NSA) system.

Description

ACCESS APPARATUS, TERMINAL APPARATUS, AND CELL LIST REGISTERING METHOD THEREOF}

The present invention, in connection with the operation of E-UTRAN New Radio Dual Connectivity (EN-DC) in 5G Non-Standalone (NSA) system, supports dual connectivity from the 4G base station as the master node to the 5G base station as the secondary node. The present invention relates to a technique for automatically constructing a list of cells.

With the development of mobile communication network for large data / high-speed transmission, mobile communication environment aimed at ultra reliable & low latency communication (URLLC) service based on near real-time data transmission and reception, for example, fifth generation mobile communication network ( 5G) will develop into the environment.

As such, at the present time of 5G development, research is being started to evolve / develop into 5G while increasing cost efficiency by utilizing 4G systems that are already widely deployed and used.

One of the results of this research is Non-Standalone (NSA) technology that uses communication services based on interworking between different heterogeneous 4G and 5G networks.

NSA technology uses 4G (LTE) as the primary network to secure seamless coverage, while 5G is used as the secondary network to transmit and receive data with higher capacity / lower latency, based on interworking between 4G and 5G networks. This is a technology using a communication service.

Accordingly, when the network is initially connected, the terminal device connects to the primary 4G network and the secondary 5G network.

At this time, the 4G base station connected to connect the terminal to the primary 4G network is called the master node, and the 5G base station connected to connect the 5G network to the secondary terminal is called the secondary node.

Meanwhile, a technology in which a terminal device connects to two or more different base stations (Master / Secondary) and uses a communication service is called an E-UTRAN New Radio Dual Connectivity technology.

That is, the terminal apparatus utilizes a dual access technology that connects both the 4G base station as a master node and the 5G base station as a secondary node to use a communication service using 4G as a primary network and 5G as a secondary network.

In this dual access technology, a cell list for supporting dual access to a 5G base station should be set in the 4G base station. However, in the current standard (EN-DC 37.340), the system information except for the MIB (Master Information Block) is established. It does not require periodic broadcasting operation.

For this reason, the operator must manually set a cell list to support dual connectivity in the 4G base station, and this means that the cell list of all the 4G base stations related to the cell coverage changes, such as new expansion and relocation of the 5G base station, must be manually updated. This leads to an increase in operating costs.

Accordingly, the present invention proposes a method of automatically constructing a cell list for supporting dual access from a 4G base station, which is a master node, to a 5G base station, which is a secondary node.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an E-UTRAN New Radio Dual Connectivity (EN-DC) operation in a 5G Non-Standalone (NSA) system. The present invention relates to a scheme for automatically constructing a cell list for supporting dual connectivity from a 4G base station, which is a master node, to a 5G base station, which is a secondary node.

An access device according to an embodiment of the present invention for achieving the above object is an acquisition unit for obtaining measurement information measuring the signal quality of a second network different from the first network from a terminal device connected to the first network ; If the target cell identified from the measurement information does not exist in the cell list for supporting the dual access to the second network for the terminal device, the terminal device obtains cell information of the target cell from the second network. A control unit for acquiring; And a registration unit which receives the cell information obtained from the second network from the terminal device and registers the cell information in the cell list.

In detail, the controller may instruct the terminal apparatus to obtain cell information of the target cell from the second network through RRC connection reconfiguration with the terminal apparatus.

In detail, when the target cell identified from the measurement information does not exist in the cell list, the access device displays information on the target cell identified from the measurement information separately from the control unit. The mobile terminal may further include an interworking unit configured to receive cell information, which is identified based on at least one of the information of the target cell and the location information of the access device, from the network device and register the cell information in the cell list.

Specifically, the cell information checked by the network device may include information on at least one of the target cell and the adjacent cell located within a set distance from the location information of the access device.

Specifically, when two or more target cells exist in the cell list, the controller broadcasts cell information in each of at least some cells of the two or more target cells, and the terminal device broadcasts from the at least some cells. It may be instructed to receive the cell information.

In detail, each of the at least some cells may broadcast cell information through a System Information Block 1 (SIB1) message.

In detail, the at least some cells may include adjacent cells located within a set distance from the location information of the access device.

A terminal apparatus capable of dual access to a first network and a second network different from the first network according to an embodiment of the present invention for achieving the above object, the first network in accordance with the connection to the first network And transmitting the measurement information measuring the signal quality of the two networks to the access device, so that the target cell identified by the access device from the measurement information is added to a cell list for supporting dual access to the second network for the terminal device. A transmission unit for determining whether or not there is; And a preamble of a physical random access channel (PRACH) specified in a master information block (MIB) from the second network according to a request from the access device when the target cell does not exist in the cell list. Requesting the cell information of the target cell from the second network based on at least one resource of time and frequency, and a radio resource message (RRC) message from the second network according to the request It characterized in that it comprises an acquisition unit for receiving the cell information through the transfer to the access device.

An access device according to an embodiment of the present invention for achieving the above object, an acquisition unit for obtaining the measurement information measuring the signal quality of the network from the terminal device; When there are two or more target cells identified from the measurement information, at least some cells of the two or more target cells broadcast cell information, and the terminal apparatus receives the cell information broadcast from the at least some cells. Indicating control unit; And a connection unit for allowing the terminal device to access one of the at least some cells based on the cell information received by the terminal device.

In detail, the at least some cells may include adjacent cells located within a set distance from the location information of the access device.

A cell list registration method in an access device according to an embodiment of the present invention for achieving the above object is measured by measuring the signal quality of a second network different from the first network from a terminal device connected to the first network; An obtaining step of obtaining information; If the target cell identified from the measurement information does not exist in the cell list for supporting the dual access to the second network for the terminal device, the terminal device obtains cell information of the target cell from the second network. A control step of acquiring; And registering the cell information obtained from the second network from the terminal device and registering the cell information in the cell list.

Specifically, the terminal device can obtain cell information from the second network through a random access channel (RACH) procedure with the second network.

Specifically, in the method, when the target cell identified from the measurement information does not exist in the cell list, the network device of the first network receives the information of the target cell identified from the measurement information separately from the control step. The method may further include an interworking step of receiving, from the network apparatus, cell information identified based on at least one of the information of the target cell and the location information of the access device and registering the cell information with the cell list.

Specifically, the cell information checked by the network device may include information on at least one of the target cell and the adjacent cell located within a set distance from the location information of the access device.

Specifically, in the controlling step, when at least two target cells exist in the cell list, at least some of the two or more target cells broadcast cell information in each cell, and the terminal apparatus broadcasts the information from the at least some cells. May be instructed to receive the casted cell information.

In detail, each of the at least some cells may broadcast cell information through a System Information Block 1 (SIB1) message.

In detail, the at least some cells may include adjacent cells located within a set distance from the location information of the access device.

Accordingly, according to the access list of the present invention and the cell list registration method of the access device, in connection with the dual-connection (EN-DC, E-UTRAN New Radio Dual Connectivity) operation in the 5G Non-Standalone (NSA) system, the master node By suggesting a method of automatically constructing a cell list to support dual connectivity from a 4G base station to a 5G base station, which is a secondary node, it is possible to prevent an operation overhead and additional costs incurred when the cell list is manually set. have.

1 is an exemplary view showing a communication environment according to an embodiment of the present invention.
2 is an exemplary diagram for explaining a general procedure of a dual connectivity technique.
3 is a schematic diagram illustrating a 4G base station according to an embodiment of the present invention.
4 is an exemplary diagram for explaining a cell list registration procedure in a 4G base station according to an embodiment of the present invention.
5 is a schematic diagram illustrating a terminal device according to an embodiment of the present invention.
6 to 9 are exemplary diagrams for explaining a cell list registration procedure in a 4G base station according to an embodiment of the present invention.
10 is a schematic configuration diagram illustrating a 5G base station according to an embodiment of the present invention.
11 and 12 are exemplary diagrams for explaining a cell (change) access procedure in a 5G base station according to an embodiment of the present invention.
13 to 16 are flowcharts illustrating a cell list registration method in a 4G base station according to an embodiment of the present invention.
17 and 18 are flowcharts illustrating a cell (change) access method in a 5G base station according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention.

1 illustrates a communication environment according to an embodiment of the present invention.

In an embodiment of the present invention, based on mutual interworking between heterogeneous networks, a terminal device accesses both base stations (Master / Secondary) of each network and uses dual communication (EN-DC, E-UTRAN New Radio Dual Connectivity). It deals with technology.

Accordingly, as shown in FIG. 1, the communication environment to which the present invention is applied is limited to a communication environment in which radio access devices of different heterogeneous networks, for example, 4G and 5G, respectively coexist.

Hereinafter, the base station 10 shown in FIG. 1 is referred to as a 4G base station, which is an access device supporting radio section access of a 4G network, and the base station 20 is a 5G base station, which is an access device supporting radio section connection of a 5G network. I will explain with reference to.

5G aims at ultra reliable & low latency communication (URLLC) services based on near real-time data transmission and reception, allowing very short (eg 0.5 ms) data transmission (transmission and reception) delays. It is discussed in the direction of allowing a relatively long level (eg, 10 ms) of control information transmission (transmission and reception) when compared with data.

Meanwhile, at the present time of 5G development, research is being started to evolve / develop into 5G while increasing cost efficiency by utilizing 4G systems that are already widely deployed and used.

One of the results of this research is the Non-Standalone (NSA) technology that uses communication services based on interworking between 4G and 5G networks.

The NSA technology uses 4G (LTE) as the primary network to secure seamless coverage while using 5G as the secondary network to transmit and receive data with higher capacity / lower latency. It is a technology that uses a communication service based on it.

In this regard, the terminal device 30 according to an embodiment of the present invention also supports the NSA technology. Upon initial access to the network according to the NSA technology, the terminal device 30 is connected to the primary 4G network and additionally connected to the secondary 5G network. do.

At this time, the 4G base station 10 to which the terminal device 30 is connected to connect to the primary 4G network is referred to as a master node, and the 5G base station 20 to connect the terminal device to the secondary 5G network is referred to as a secondary node. .

The terminal device 30 is a 4G base station as a master node in order to use a communication service using 4G as a primary network and 5G as a secondary network according to the application of the dual access technology dealt with in an embodiment of the present invention. It is a matter of course that both the 10G and the secondary node can be connected to the 5G base station 20.

Meanwhile, FIG. 2 exemplarily illustrates a general procedure of the dual access technology defined in the current standard (EN-DC 37.340).

As shown in FIG. 2, the dual access technology includes a connection procedure (4G Attach) in which the terminal device 10 connects to a 4G network, a measurement procedure (NR Measurement) for measuring signal quality of a 5G network, and a cell of a 5G network. Can be divided into a recognition procedure (NR cell recognition), and a dual access setup procedure (EN-DC setup).

Specifically, the terminal equipment performs a procedure from the 4G base station, which is the master node, to the RB (Random Access Channel), to the establishment of a data radio bearer (DRB). Signal quality measurement for the mobile station, and the terminal equipment measures the signal quality, and when there exists a target cell that satisfies a specific condition (RSRP / RSRQ / SINR> Threshold), measurement information of the corresponding cell (eg PCI RSRP / RSRQ / SINR) to the 4G base station.

On the other hand, the 4G base station checks whether the PCI (Physical Cell ID) in the measurement information received from the terminal equipment is in the cell list owned by the user, and if present in the cell list, the X2 I / F with the 5G base station corresponding to the cell. Obtain cell (base station) information to be transmitted to the terminal device through.

Furthermore, the terminal equipment acquires cell information of the target cell through an RRC connection reconfiguration procedure with the 4G base station, and accesses the 5G base station of the target cell through an RACH procedure using the obtained cell (base station) information. Then, by performing the operation of changing the EPC (Evolved Packet Core) and UP (User Plane) path from the 4G base station to the 5G base station, it is possible to complete the data radio bearer (DRB) setting procedure for the dual access operation.

As described above, in the dual access technology according to the current standard, in order to support dual access to a terminal device, it is understood that a cell list for supporting dual access to a 5G base station must be set in the 4G base station.

However, the current standard does not require periodic broadcasting operation for the system information except for the MIB (Master Information Block), and therefore, the operator must manually set the cell list to support dual access in the 4G base station. .

In addition, the manual configuration environment according to such specification constraints causes an increase in the operational overhead and the resulting operating cost of manually updating the list of cells set in all 4G base stations associated with each cell coverage change such as new expansion and relocation of 5G base stations. Done.

Therefore, in an embodiment of the present invention, a new scheme for automatically configuring a cell list for supporting dual connectivity from a 4G base station 10, which is a master node, to a 5G base station 20, which is a secondary node, is newly proposed. The configuration of the 4G base station 10 for realization will be described in more detail.

3 shows a schematic configuration of a 4G base station 10 according to an embodiment of the present invention.

As shown in FIG. 3, the 4G base station 10 according to an embodiment of the present invention may have a configuration including an acquirer 11, a controller 12, and a register 13.

In addition, in addition to the above-described configuration, the 4G base station 10 according to an embodiment of the present invention may have a configuration further including a connection unit 14 and an interworking unit 15.

The entire configuration or at least a part of the 4G base station 10 may be implemented in the form of a hardware module or a software module, or may be implemented in the form of a combination of a hardware module and a software module.

Here, the software module may be understood as, for example, an instruction executed by a processor processing an operation in the 4G base station 10, and the instruction may have a form mounted in a separate memory in the 4G base station 10. have.

On the other hand, the 4G base station 10 according to an embodiment of the present invention, in addition to the above-described configuration, the communication unit is an RF module that is responsible for the actual communication function with the 5G base station 20, the terminal device 30, and the network device 40 It may have a configuration further comprising (16).

Here, the network device 40 refers to a higher element than the 4G base station 10 in the 4G network, and may include, for example, a 4G element management system (EMS) and an operations support system (OSS). 40 may recognize location information (latitude / longitude / altitude) of a cell (5G base station) of a 5G network according to an embodiment of the present invention.

The communication unit 16 also includes, but is not limited to, for example, an antenna system, an RF transceiver, one or more amplifiers, tuners, one or more oscillators, digital signal processors, codec chipsets, and memories, and the like. Any known circuit to be performed may be included.

The 4G base station 10 according to the embodiment of the present invention may automatically set a cell list for supporting dual access to the 5G network for the terminal device 30 based on the above-described configuration. Each configuration in the 4G base station 10 for realization will be described in more detail.

Prior to the detailed description, the detailed operation of the 4G base station 10 to be described later may be understood to newly define a recognition procedure (NR cell recognition) for recognizing a cell of the 5G network in FIG. The remainder of the procedure assumes compliance with the current standard.

The acquisition unit 11 performs a function of acquiring the measurement information measuring the signal quality.

More specifically, the acquisition unit 11 receives the measurement information (MR, Measurement Report) measuring the signal quality of the 5G network from the terminal device 30 connected to the 4G network.

To this end, the acquiring unit 11 instructs the terminal device 30 connected to the 4G network (LTE Attach) to measure the signal quality of the 5G base stations 20 which are secondary nodes. Accordingly, the terminal device 30 ) Measures the signal quality and when there exists a cell (hereinafter referred to as a 'target cell') that satisfies a specific condition (RSRP / RSRQ / SINR> Threshold), measurement information (eg PCI, Band information) about the cell ) Is transmitted to the 4G base station 10.

For reference, the operation up to delivering measurement information may be understood as the process 1) to 2) of FIG. 4 to be described below.

The controller 12 performs a control operation of obtaining cell information required for cell list registration.

More specifically, the control unit 12 registers the cell list when the target cell identified from the measurement information (for example, 20B of FIG. 1) does not exist in the cell list held for establishing the dual connection to the 5G network. A control operation for obtaining necessary cell information is performed.

In this case, the controller 12 may adopt a method of controlling the terminal device 30 to obtain cell information from the 5G network.

In this regard, FIG. 4 schematically illustrates a control operation for obtaining cell information from the terminal device 30.

That is, when it is determined that the target cell (for example, 20B) identified from the measurement information does not exist in the cell list, the controller 12 performs an RRC connection reconfiguration with the terminal device 30. Instructs (10) to obtain cell information necessary for cell list registration from the 5G network (3-1 to 3-2).

At this time, the control unit 12 transmits PCI and Band information, which is information on the target cell (eg, 20B) identified from the measurement information, so that the terminal device 30 can obtain the cell information.

In response, the terminal device 30 acquires cell information of the target cell (eg, 20B) through a random access channel (RACH) procedure with the 5G network (3-3 to 3-4).

That is, the terminal device 30 may provide the cell information necessary for cell list registration based on the PRACH (Physical Random Access Channel) resource specified in the MIB (Master Information Block) from the 5G network to target cell (eg, 20B) of the 5G network. In this case, the corresponding cell information may be received through a Radio Resource Message (RRC) message from a target cell (for example, 20B).

Here, the PRACH resources used for the cell information request include, for example, a dedicated PRACH preamble, a specific PRACH time resource (using a common PRACH preamble), a specific PRACH frequency resource (using a common PRACH preamble), and a specific PRACH time & frequency resource combination. All preamble / time / frequency resources for the PRACH operation may be used, but not limited thereto.

In addition, in the case of a Radio Resource Message (RRC) message from a 5G network, for example, a method such as using cellForWhichToReportCGI in Measurement Config IE used for existing Automatic Neighbor Relation (ANR) operation is possible.

Meanwhile, the configuration of the terminal device 30 related to the acquisition of cell information of the target cell (for example, 20B) will be described as follows.

5 shows a schematic configuration of a terminal device 30 according to an embodiment of the present invention.

As shown in FIG. 5, the terminal device 30 according to an embodiment of the present invention has a configuration including a transmission unit 31 for transmitting measurement information and an acquisition unit 32 for acquiring cell information. Can be.

The entire configuration or at least a part of the terminal device 20 may be implemented in the form of a hardware module or a software module, or may be implemented in the form of a combination of a hardware module and a software module.

Here, the software module may be understood as, for example, an instruction executed by a processor that processes an operation in the terminal device 30, and the command may have a form mounted in a separate memory in the terminal device 30. have.

On the other hand, the terminal device 30 according to an embodiment of the present invention, in addition to the above-described configuration, the communication unit 33 which is an RF module that is responsible for the actual communication function with the 4G base station 10 and the 5G base station 20 further. It may have a configuration to include.

The terminal device 30 according to an embodiment of the present invention can obtain the cell information of the target cell based on the above-described configuration. Hereinafter, each configuration in the terminal device 30 for realizing this is more specific. This will be described.

The transmission unit 31 performs a function of transmitting the measurement information.

More specifically, the transmitter 31 transmits the measurement information measuring the signal quality of the 5G network to the 4G base station 10 in accordance with the connection of the 4G network.

At this time, the transmission unit 31 transmits the measurement information measuring the signal quality of the 5G network to the 4G base station 10, the target cell confirmed by the 4G base station 10 from the measurement information for the terminal device 30 It is possible to determine whether it exists in the cell list to support dual connectivity to the 5G network.

The obtaining unit 32 performs a function of obtaining cell information.

More specifically, the acquirer 32 acquires cell information of the target cell according to a request from the 4G base station 10 that is received when the target cell does not exist in the cell list.

At this time, the acquisition unit 32 is a preamble (time), time (time), of the physical random access channel (PRACH) specified in the master information block (MIB) from the second network in response to a request from the 4G base station 10 And cell information required for cell list registration on the basis of at least one resource of frequency to the target cell of the 5G network.

Furthermore, the acquisition unit 32 receives the cell information of the target cell through a radio resource message (RRC) message according to the above request, and transmits the received cell information to the 4G base station 10 to register in the cell list. do.

The configuration of the terminal device 30 has been described above, and the description of the 4G base station 10 with reference to FIG. 3 will be continued.

The registration unit 13 performs a function of registering cell information in a cell list.

More specifically, when the cell information is received from the terminal device 30 that has obtained the cell information from the target cell (eg, 20B) in the 5G network, the registration unit 13 registers the received cell information in its own cell list. Done.

In this case, the cell information obtained by the terminal device 30 may be received from the terminal device 30 in the form of measurement information (MR), which is obtained by the UE through an SIB1 message in the existing LTE ANR operation. A Cell Global Identifier (NR-CGI), a Tracking Area Code (TAC), a Public Landmark Mobile Network-Identity (PLMN-ID), or the like may correspond.

For reference, the operation of registering the cell list with the cell information received from the terminal device 30 may be understood as the process 3-5) to 3-6) in FIG. 4 described above.

The connecting portion 14 performs a function of establishing a dual connection.

More specifically, when the registration of the cell list is completed, the access unit 14 accesses the 5G base station (eg, 20B) through the RACH procedure based on the cell information of the target cell (eg, 20B) registered in the cell list. After performing the operation of changing the EPC (Evolved Packet Core) and the UP (User Plane) path from the 4G base station 10 to the 5G base station (for example, 20B), a procedure for setting a data radio bearer (DRB) for dual access operation is performed. You can finish it.

For reference, this dual connection setting operation may be understood as the process 4) illustrated in FIG. 4.

The interlocking unit 15 performs a function of obtaining cell information from the network device 40.

More specifically, the interlocking unit 15, from the network device 40, if the target cell (eg, 20B) identified from the measurement information does not exist in the cell list held for establishing the dual connection to the 5G network. Cell information is obtained.

For reference, the operation of the linking unit 15 may be understood as another embodiment for obtaining cell information as an operation separate from the operation of the control unit 12 described above.

In this regard, FIG. 6 schematically illustrates an operation of acquiring cell information from the network device 40.

That is, when the target cell (eg, 20B) identified from the measurement information does not exist in the cell list held for establishing dual connectivity to the 5G network, the linkage unit 15 may determine the target cell (eg, 20B). Information (PCI, Band) is transmitted to the network device 40 to request cell information necessary for cell list registration (3-1 to 3-2).

On the other hand, the network apparatus 40 searches for the same cell that matches the information (PCI, Band) of the target cell (for example, 20B) received from the 4G base station 10 based on the location information of the 4G base station 10. The cell information is fed back to the 4G base station 10, that is, the interlocking unit 15 (3-3 to 3-4).

As such, the cell information obtained through the interlocking unit 15 is registered in the cell list through the registration unit 13 as in the above-described embodiment (3-5), and after the registration procedure of the cell list is completed, the connection unit is similarly The procedure for establishing a dual connection through 14 may be completed (4).

Meanwhile, in connection with the above operation of acquiring cell information from the network device 40, the companion unit 15 acquires not only information on a target cell (eg, 20B) but also information on an adjacent cell adjacent to the 4G base station 10. can do.

In this regard, FIG. 7 schematically illustrates an operation of acquiring information about an adjacent cell from the network device 40.

That is, when the target cell (eg, 20B) identified from the measurement information does not exist in the cell list held for establishing dual connectivity to the 5G network, the linkage unit 15 may determine the target cell (eg, 20B). Information (PCI, Band) is transmitted to the network device 40 to request cell information necessary for cell list registration (3-1 to 3-2).

At this time, the companion unit 15 transmits not only the information (PCI, Band) of the target cell (eg 20B), but also the number N of cells that can be currently registered in the 4G base station 10 to the network device 40. .

On the contrary, the network device 40 may determine not only the target cell but also the neighboring cell at a predetermined distance d from the 4G base station 10 based on the location information of the 4G base station 10. The number N of cells is searched and fed back to the 4G base station 10, that is, the interlocking unit 15, with all of the cell information of the searched neighbor cells (3-3 to 3-4).

For reference, in the above operation of acquiring information about the neighbor cell from the network device 40, another terminal device connected to the 4G base station 10 is adjacent to the 5G network other cell adjacent to the target cell (eg, 20B) in a different direction. It may be understood to reduce a cell list registration procedure that may be additionally generated in case of transmitting information about as a measurement information.

Meanwhile, in the above description, the case in which the target cell identified from the measurement information does not exist in the cell list has been described. On the contrary, it is assumed that two or more target cells identified in the measurement information exist in the cell list (PCI Confusion). Can be.

In this case, it is necessary to proceed with the dual access procedure by selecting one of the two or more target cells as a suitable cell, the operation of the control unit 12 for this will be described in detail.

The control unit 12 performs a function of acquiring cell information through a broadcasting control scheme.

More specifically, the control unit 12 performs broadcasting control for each of the two or more target cells when the target cell identified from the measurement information is present in the cell list held for establishing the dual connection to the 5G network. Cell information is obtained through the.

In this regard, FIG. 8 schematically illustrates a broadcasting control operation for each of two or more target cells.

That is, the controller 12, when two or more target cells identified from the measurement information exist in the cell list held for establishing dual connectivity to the 5G network (for example, 20A and 20B of FIG. 1), the two or more targets Instructs each cell (eg, 20A and 20B) to broadcast cell information (3-1 to 3-2).

Here, the message for instructing broadcasting to each target cell may use, for example, an ENB Configuration Update message, which is an X2 message, and each of the target cells (for example, 20A and 20B) receiving the message has a separate termination request message. Broadcast cell information until received.

In this case, the cell information broadcast from each of the target cells (for example, 20A and 20B) is the same as the information required for cell list registration. In an existing LTE system, a SIB1 (System Information Block 1) message corresponds to this, and according to an embodiment of the present invention In the embodiment as well, each of the target cells (eg, 20A and 20B) may broadcast cell information through an SIB1 message.

In addition, the control unit 12 instructs broadcasting for each of two or more target cells (eg, 20A and 20B), and is broadcasted from each of two or more target cells (eg, 20A and 20B) to the terminal device 30. Instruct to receive the cell information (3-3).

As such, the operation of instructing the terminal device 30 to receive the cell information may include, for example, a method of using cellForWhichToReportCGI of Measurement Config IE in the RRC Connection Reconfiguration message, which is a message instructing the UE to read the SIB1 message in the existing LTE ANR operation. In addition, it is also possible to operate the DRX (Discontinuous Reception) such that the UE disconnects the serving cell for a while and reads the SIB1 message from the NR cell.

In this case, the control unit 12 is for each of the two or more target cells (eg, 20A, 20B) so that the terminal device 30 can receive cell information broadcast from each of two or more target cells (eg, 20A, 20B). Of course, information (PCI, Band) is delivered together.

Meanwhile, the terminal device 30 acquires cell information by reading the SIB1 message broadcast from each of two or more target cells (eg, 20A and 20B) according to an instruction from the 4G base station 10 (3-4).

As such, the cell information obtained from the SIB1 message may correspond to information required for cell list registration, for example, a Cell Global Identifier (NR-CGI), a Tracking Area Code (TAC), a Public Landmark Mobile Network-Identity (PLMN-ID), or the like. The cell information acquisition operation may follow the ANR operation defined in the existing standard.

In addition, the terminal device 30 transmits the cell information obtained from the SIB1 message to the 4G base station 10 (3-5).

In this case, the terminal device 30 may transmit the cell information obtained from the SIB1 message in the form of measurement information (MR) to the 4G base station 10, and the message is a measurement report used for the existing ANR operation. The reportCGI IE in the message can be used.

Then, when the cell information of each of the two or more target cells (eg, 20A and 20B) is received from the terminal device 30, the controller 12 may use two or more target cells (eg, 20A and 20B) based on the corresponding cell information. Select (recognize) one of the cells as a suitable cell, so that a dual connection procedure can be performed with the corresponding cell, and after the completion of the cell selection (recognition), each of two or more target cells (for example, 20A and 20B) ends. Send a request message to stop the broadcasting operation (3-6 ~ 3-7).

On the other hand, when the number of target cells increases in relation to the broadcasting control operation for each of two or more target cells, the number of messages for indicating and stopping the broadcasting increases by that amount, which may lead to an increase in X2 overhead.

In this case, it is necessary to limit the number of messages, which will be described in detail below.

In this regard, FIG. 9 schematically illustrates a location based broadcasting control operation.

That is, the control unit 12, when the target cell identified from the measurement information is present in two or more (three or more) in the cell list held in order to establish a dual connection to the 5G network (for example, 20A, 20B of Figure 1 , 20C), to broadcast cell information only for some target cells (eg 20A, 20B) within 2 or more target cells (eg 20A, 20B, 20C) within a certain distance (d) from the 4G base station 10. Instruct (3-1 to 3-3).

In this case, the identification of some target cells within a certain distance (d), when the 4G base station 10 stores the cell list, the location information of the cell corresponding to each list is stored together and identified through the stored information, or It may be made in connection with the network device 40 described above.

Here, in the case of the scheme associated with the network device 40, information about each of two or more target cells (for example, 20A, 20B, and 20C) is transmitted to the network device 40, so that a predetermined distance from the 4G base station 10 ( The screening result for some target cells (eg, 20A and 20B) selected within d) can be obtained from the network device 40.

In addition, the control unit 12 instructs broadcasting for each of some target cells (eg, 20A and 20B), while the terminal device 30 broadcasts cell information broadcasted from each of some target cells (eg, 20A and 20B). Instruct to receive (3-4).

In this case, the controller 12 may transmit information about each of the target cells (eg, 20A and 20B) so that the terminal device 30 may receive cell information broadcast from each of the target cells (eg, 20A and 20B). Of course, PCI and Band) are transmitted together.

Meanwhile, the terminal device 30 acquires cell information by reading the SIB1 message broadcast from each of some target cells (eg, 20A and 20B) according to an instruction from the 4G base station 10, and acquires the cell information by 4G. Transfer to base station 10 (3-5 ~ 3-6).

Then, when the cell information of each of the target cells (eg, 20A and 20B) is received from the terminal device 30, the controller 12 may select one of some target cells (eg, 20A and 20B) based on the corresponding cell information. Select (recognize) a cell as a suitable cell so that a dual connection procedure can be performed with the cell. After completion of the cell selection (recognition), a termination request message is sent to each target cell (for example, 20A and 20B). Send to stop the broadcast operation (3-7 ~ 3-8).

As described above, when two or more target cells are present in the cell list, in the exemplary embodiment of the present invention, dual access configuration may be performed by selecting one of the two or more target cells as an appropriate cell through the above-described broadcasting control scheme. In addition, in this process, by controlling broadcasting only for some target cells within a predetermined distance (d) from the 4G base station 10 among the two or more target cells, unnecessary backhaul resource usage is limited, so that the broadcasting control message This can suppress the increase in X2 overhead.

10 shows a schematic configuration of a 5G base station 20 according to an embodiment of the present invention.

As shown in FIG. 10, the 5G base station 20 according to an embodiment of the present invention includes a base station module 20-1 (CU, Central Unit) and a lower layer (PDCP / RLC / MAC /) that perform an RRC layer function. The wireless module 20-2 (DU, Distributed Unit) in charge of the PHY) function is divided, and the base station module 20-1 and the wireless module 20-2 communicate using the F1 I / F defined in the 5G standard.

In addition, the base station module 20-1 may be virtualized using a commercial server of a commercial-of-the-shelf (COTS) type, and thus the wireless module 20-2 belonging to one base station module 20-1 ), That is, the number of cells may be in the tens to hundreds.

In this regard, as in 4G (LTE), the factor that distinguishes each cell based on the physical layer is a combination of PCI and carrier (NR-ARFCN) as in 5G standard, and 1 carrier of 100MHz BW at 3.5GHz at 5G frequency. Is considered, dozens to hundreds of cells in one base station module 20-1 should be distinguished using only PCI information.

Therefore, in one embodiment of the present invention, if two or more target cells exist from the measurement information transmitted from the terminal device 30 to the base station module 20-1 based on the SRB3 in such an environment, the most suitable one cell is selected. It is necessary to select (recognize) a suitable cell, and hereinafter, the configuration of the base station module 20-1 will be described.

As a configuration for this, the base station module 20-1 according to an embodiment of the present invention may have a configuration including an acquisition unit 21, a control unit 22, and a connection unit 23.

The whole configuration or at least a part of the base station module 20-1 may be implemented in the form of a hardware module or a software module, or may be implemented in the form of a combination of a hardware module and a software module.

When the base station module 20-1 according to the embodiment of the present invention has two or more target cells, the base station module 20-1 may select (recognize) the most suitable one cell as a suitable cell. Each component in (20-1) will be described in more detail.

The acquisition unit 21 performs a function of acquiring the measurement information measuring the signal quality.

More specifically, the acquisition unit 21 receives the measurement information (MR, Measurement Report) measuring the signal quality of the 5G network from the terminal device 30 connected to the 5G network.

In this regard, the terminal device 30 measures the signal quality of each of the plurality of wireless modules 20-2 constituting the 5G network, and measures specific conditions (RSRP / RSRQ / SINR> Threshold) while measuring the signal quality. If there is a target cell that satisfies, the measurement information (eg, PCI) for the cell is transmitted to the base station module 20-1 based on the SRB3.

For reference, the operation of transmitting the measurement information may be understood as the process 1) of FIG. 10 to be described below.

The controller 22 performs a broadcasting control operation on two or more target cells.

More specifically, the control unit 22 has two or more target cells from the measurement information received from the terminal device 30, and these two or more target cells (for example, 20-2A and 20-2B) are assigned to cells managed by the user. If it is determined to belong, the broadcasting control operation is performed.

In this regard, FIG. 11 schematically illustrates a broadcasting control operation for two or more target cells.

That is, when it is determined that the target cell identified from the measurement information has two or more target cells, and the two or more target cells belong to a cell managed by the controller 22, the controller 22 includes two or more target cells (eg, 20-2A, 20-2B) instruct to broadcast cell information in each (2-1, 2-2).

In this case, each of two or more target cells (eg, 20-2A and 20-2B) may broadcast cell information through an SIB1 message.

In addition, the control unit 22 instructs broadcasting for each of two or more target cells (eg, 20-2A and 20-2B), and the terminal device 30 provides two or more target cells (eg, 20-2A and 20). -2B) instruct to receive the broadcasted cell information from each (2-3).

In this case, the controller 22 may instruct reception of cell information through an RRC connection reconfiguration with the terminal device 30, and the terminal device 30 may have two or more target cells (eg, 20-2A). 20-2B) also transmits information (PCI) for each of two or more target cells (for example, 20-2A and 20-2B) together to receive cell information broadcasted from each other.

Meanwhile, the terminal device 30 acquires cell information by reading the SIB1 message broadcast from each of two or more target cells (eg, 20-2A and 20-2B) according to an instruction from the base station module 20-1. The cell information is transferred to the base station module 20-1 (2-4 to 2-5).

Furthermore, when the cell information of each of two or more target cells (eg, 20-2A and 20-2B) is received from the terminal device 30, the controller 22 may use two or more target cells (eg, 20) based on the corresponding cell information. By selecting (recognizing) one cell 20-2A of -2A and 20-2B as a suitable cell (2-6), the connection unit 23 is selected (recognized) into the selected cell for the terminal device 30. Allow change access (3).

For reference, an operation of the terminal device 30 changing access to the selected (recognized) cell may follow an operation defined in the 3GPP TS 37.340 standard.

On the other hand, when the number of target cells increases in relation to the broadcasting control operation for each of two or more target cells, the number of messages for indicating and stopping the broadcasting increases by that amount, which may lead to an increase in X1 overhead.

In this case, it is necessary to limit the number of messages, and the operation of the control unit 22 for this will be described in detail below.

In this regard, FIG. 12 schematically illustrates a location based broadcasting control operation.

That is, the control unit 22 has two or more target cells identified from the measurement information (three or more), and all of the two or more target cells (for example, 20-2A, 20-2B, and 20-C) have their own cells. If belonging to, only broadcasts to some target cells (eg 20-2A, 20-2B) within two or more target cells (eg 20A, 20B, 20C) within a certain distance (d) from the control module 20-1. Instruct them to cast (2-1 to 2-3).

In addition, the control unit 22 instructs broadcasting for each of some target cells (eg, 20-2A and 20-2B), and broadcasts from some target cells (eg, 20A and 20B) to the terminal device 30. Instruct to receive the cast cell information (2-4).

In this case, the controller 22 may allow the terminal device 30 to receive cell information broadcast from each of some target cells (eg, 20-2A and 20-2B), respectively. Of course, information about (PCI) is also transmitted.

Meanwhile, the terminal device 30 acquires cell information by reading the SIB1 message broadcast from each of two or more target cells (eg, 20-2A and 20-2B) according to an instruction from the base station module 20-1. The cell information is transferred to the base station module 20-1 (2-5 to 2-6).

Furthermore, when the cell information of each of two or more target cells (eg, 20-2A and 20-2B) is received from the terminal device 30, the controller 22 may use two or more target cells (eg, 20) based on the corresponding cell information. By selecting (recognizing) one cell 20-2A of -2A and 20-2B as a suitable cell (2-7), the connection unit 23 is selected (recognized) into the selected cell for the terminal device 30. Allow change access (3).

As such, in an embodiment of the present invention, when two or more target cells exist in a 5G network, the above-described broadcasting control scheme enables one to change and access the most suitable one cell among the two or more target cells to a suitable cell. In this process, by controlling broadcasting only for some target cells within a predetermined distance (d) of the base station module 20-1 among two or more target cells, unnecessary use of backhaul resources is restricted, thereby causing X1 due to a broadcasting control message. It is possible to suppress the increase in overhead.

Hereinafter, a cell list registration method in the 4G base station 10 according to an embodiment of the present invention will be described with reference to FIGS. 13 to 16.

First, an operation in which the 4G base station 10 registers cell information obtained through a random access channel (RACH) procedure in a cell list will be described with reference to FIG. 13.

First, the acquisition unit 11 receives measurement information (MR, Measurement Report) measuring the signal quality of the 5G network from the terminal device 30 connected to the 4G network (S11-S12).

To this end, the acquiring unit 11 instructs the terminal device 30 connected to the 4G network (LTE Attach) to measure the signal quality of the 5G base stations 20 which are secondary nodes. Accordingly, the terminal device 30 ) Transmits measurement information (eg, PCI, Band information) about the cell to the 4G base station 10 when there is a target cell that satisfies a specific condition (RSRP / RSRQ / SINR> Threshold) while measuring signal quality. do.

Then, the control unit 12, if the target cell (eg, 20B of FIG. 1) identified from the measurement information does not exist in the cell list held for establishing the dual connection to the 5G network, the terminal device 30 Instructs the terminal device 10 to acquire cell information necessary for cell list registration from the 5G network through RRC connection reconfiguration with the mobile station (S13-S14).

At this time, the control unit 12 transmits PCI and Band information, which is information on the target cell (eg, 20B) identified from the measurement information, so that the terminal device 30 can obtain the cell information.

In response, the terminal device 30 acquires cell information of the target cell (eg, 20B) through a random access channel (RACH) procedure with the 5G network.

That is, the terminal device 30 may provide the cell information necessary for cell list registration based on the PRACH (Physical Random Access Channel) resource specified in the MIB (Master Information Block) from the 5G network to target cell (eg, 20B) of the 5G network. In this case, the corresponding cell information may be received through a Radio Resource Message (RRC) message from a target cell (for example, 20B).

Here, the PRACH resources used for the cell information request include, for example, a dedicated PRACH preamble, a specific PRACH time resource (using a common PRACH preamble), a specific PRACH frequency resource (using a common PRACH preamble), and a specific PRACH time & frequency resource combination. All preamble / time / frequency resources for the PRACH operation may be used, but not limited thereto.

In addition, in the case of a Radio Resource Message (RRC) message from a 5G network, for example, a method such as using cellForWhichToReportCGI in Measurement Config IE used for existing Automatic Neighbor Relation (ANR) operation is possible.

Furthermore, when the cell information is received from the terminal device 30 that has obtained the cell information from the target cell (for example, 20B) in the 5G network, the registration unit 13 registers the received cell information in the cell list held by the user (see FIG. S15-S16).

In this case, the cell information obtained by the terminal device 30 may be received from the terminal device 30 in the form of measurement information (MR), which is obtained by the UE through an SIB1 message in the existing LTE ANR operation. A Cell Global Identifier (NR-CGI), a Tracking Area Code (TAC), a Public Landmark Mobile Network-Identity (PLMN-ID), or the like may correspond.

Subsequently, when registration of the cell list is completed, the access unit 14 accesses the 5G base station (eg 20B) through the RACH procedure based on the cell information of the target cell (eg 20B) registered in the cell list, and then 4G. The base station 10 performs an operation of changing an Evolved Packet Core (EPC) and a UP (User Plane) path from the base station 10 to the 5G base station (eg, 20B) to complete a data radio bearer (DRB) setup procedure for dual access operation. It may be (S17).

Next, the operation of registering the cell information obtained from the network device 40 into the cell list by the 4G base station 10 will be described with reference to FIG. 14.

First, the obtaining unit 11 receives measurement information (MR, Measurement Report) measuring the signal quality of the 5G network from the terminal device 30 connected to the 4G network (S21-S22).

To this end, the acquiring unit 11 instructs the terminal device 30 connected to the 4G network (LTE Attach) to measure the signal quality of the 5G base stations 20 which are secondary nodes. Accordingly, the terminal device 30 ) Transmits measurement information (eg, PCI, Band information) about the cell to the 4G base station 10 when there is a target cell that satisfies a specific condition (RSRP / RSRQ / SINR> Threshold) while measuring signal quality. do.

Then, the interlocking unit 15, if the target cell (e.g. 20B) identified from the measurement information does not exist in the list of cells held for establishing dual connectivity to the 5G network, the interlocking unit 15 (e.g. 20B) Information (PCI, Band) is transmitted to the network device 40 to request cell information necessary for cell list registration (S23-S24).

On the other hand, the network apparatus 40 searches for the same cell that matches the information (PCI, Band) of the target cell (for example, 20B) received from the 4G base station 10 based on the location information of the 4G base station 10. The cell information is fed back to the 4G base station 10, that is, the interlocking unit 15.

Meanwhile, in connection with the above operation of acquiring cell information from the network device 40, the companion unit 15 acquires not only information on a target cell (eg, 20B) but also information on an adjacent cell adjacent to the 4G base station 10. can do.

That is, when the target cell (eg, 20B) identified from the measurement information does not exist in the cell list held for establishing dual connectivity to the 5G network, the linkage unit 15 may determine the target cell (eg, 20B). In addition to the information (PCI, Band), the number (N) of cells that can be currently registered in the 4G base station 10 may be transmitted to the network device 40 together.

In this case, the network device 40 can register not only the target cell but also adjacent cells at a predetermined distance d from the 4G base station 10 based on the location information of the 4G base station 10. By searching as many as N, all the cell information of the searched neighbor cells may be fed back to the 4G base station 10, that is, the interlocking unit 15.

For reference, in the above operation of acquiring information about the neighbor cell from the network device 40, another terminal device connected to the 4G base station 10 is adjacent to the 5G network other cell adjacent to the target cell (eg, 20B) in a different direction. It may be understood to reduce a cell list registration procedure that may be additionally generated in case of transmitting information about as a measurement information.

Furthermore, when the cell information is received from the network device 40, the registration unit 13 registers the received cell information to the cell list held by the registration unit 13 (S25-S26).

Subsequently, when registration of the cell list is completed, the access unit 14 accesses the 5G base station (eg 20B) through the RACH procedure based on the cell information of the target cell (eg 20B) registered in the cell list, and then 4G. The base station 10 performs an operation of changing an Evolved Packet Core (EPC) and a UP (User Plane) path from the base station 10 to the 5G base station (eg, 20B) to complete a data radio bearer (DRB) setup procedure for dual access operation. It may be (S27).

Next, a broadcast control operation of the 4G base station 10 will be described with reference to FIG. 15.

First, the obtaining unit 11 receives measurement information (MR, Measurement Report) measuring the signal quality of the 5G network from the terminal device 30 connected to the 4G network (S31-S33).

To this end, the acquiring unit 11 instructs the terminal device 30 connected to the 4G network (LTE Attach) to measure the signal quality of the 5G base stations 20 which are secondary nodes. Accordingly, the terminal device 30 ) Transmits measurement information (eg, PCI, Band information) about the cell to the 4G base station 10 when there is a target cell that satisfies a specific condition (RSRP / RSRQ / SINR> Threshold) while measuring signal quality. do.

Then, the control unit 12, if the target cell identified from the measurement information is present in the cell list held in order to establish a dual connection to the 5G network (for example, 20A, 20B in Fig. 1), 2 or more Instructing to broadcast cell information in each of the target cells (eg, 20A and 20B) (S33-S34).

Here, the message for instructing broadcasting to each target cell may use, for example, an ENB Configuration Update message, which is an X2 message, and each of the target cells (for example, 20A and 20B) receiving the message has a separate termination request message. Broadcast cell information until received.

In this case, the cell information broadcast from each of the target cells (for example, 20A and 20B) is the same as the information required for cell list registration. In an existing LTE system, a SIB1 (System Information Block 1) message corresponds to this, and according to an embodiment of the present invention In the embodiment as well, each of the target cells (eg, 20A and 20B) may broadcast cell information through an SIB1 message.

In addition, the control unit 12 instructs broadcasting for each of two or more target cells (eg, 20A and 20B), and is broadcasted from each of two or more target cells (eg, 20A and 20B) to the terminal device 30. Instructing to receive the cell information (S35).

As such, the operation of instructing the terminal device 30 to receive the cell information may include, for example, a method of using cellForWhichToReportCGI of Measurement Config IE in the RRC Connection Reconfiguration message, which is a message instructing the UE to read the SIB1 message in the existing LTE ANR operation. In addition, it is also possible to operate the DRX (Discontinuous Reception) such that the UE disconnects the serving cell for a while and reads the SIB1 message from the NR cell.

In this case, the control unit 12 is for each of the two or more target cells (eg, 20A, 20B) so that the terminal device 30 can receive cell information broadcast from each of two or more target cells (eg, 20A, 20B). Of course, information (PCI, Band) is delivered together.

Meanwhile, the terminal device 30 acquires cell information by reading SIB1 messages broadcast from each of two or more target cells (eg, 20A and 20B) according to an instruction from the 4G base station 10, and obtains the obtained cell information. Transmit to 4G base station 10.

In this case, the terminal device 30 may transmit the cell information obtained from the SIB1 message in the form of measurement information (MR) to the 4G base station 10, and the message is a measurement report used for the existing ANR operation. The reportCGI IE in the message can be used.

Further, when the cell information of each of two or more target cells (eg, 20A and 20B) is received from the terminal device 30, the controller 12 may select one of two or more target cells (eg, 20A and 20B) based on the corresponding cell information. One cell (e.g., 20B) is selected (recognized) as the appropriate cell, so that a dual connection procedure can be performed with the cell. After completion of the cell selection (recognition), two or more target cells (e.g., 20A, 20B) Sending a termination request message for each stops the broadcasting operation (S36-S38).

Subsequently, when the target cell selection (recognition) is completed, the access unit 14 connects to the 5G base station (eg, 20B) through the RACH procedure based on the selected cell information, and then the 5G base station (eg, the 4G base station 10). By performing an operation of changing an Evolved Packet Core (EPC) and a UP (User Plane) path to 20B), a procedure for setting a data radio bearer (DRB) for dual access operation may be completed (S39).

Next, a location-based broadcasting control operation of the 4G base station 10 will be described with reference to FIG. 16.

First, the acquisition unit 11 receives measurement information (MR, Measurement Report) measuring the signal quality of the 5G network from the terminal device 30 connected to the 4G network (S41-S42).

To this end, the acquiring unit 11 instructs the terminal device 30 connected to the 4G network (LTE Attach) to measure the signal quality of the 5G base stations 20 which are secondary nodes. Accordingly, the terminal device 30 ) Transmits measurement information (eg, PCI, Band information) about the cell to the 4G base station 10 when there is a target cell that satisfies a specific condition (RSRP / RSRQ / SINR> Threshold) while measuring signal quality. do.

Then, the control unit 12, when the target cell identified from the measurement information is present in two or more (three or more) in the cell list held to establish a dual connection to the 5G network (for example, 20A, FIG. 1, Broadcasting cell information only for some target cells (eg 20A, 20B) within 20 B, 20C) and two or more target cells (eg 20A, 20B, 20C) within a certain distance (d) from the 4G base station 10 Instructing to do so (S43-S45).

In this case, the identification of some target cells within a certain distance (d), when the 4G base station 10 stores the cell list, the location information of the cell corresponding to each list is stored together and identified through the stored information, or It may be made in connection with the network device 40 described above.

Here, in the case of the scheme associated with the network device 40, information about each of two or more target cells (for example, 20A, 20B, and 20C) is transmitted to the network device 40, so that a predetermined distance from the 4G base station 10 ( The screening result for some target cells (eg, 20A and 20B) selected within d) can be obtained from the network device 40.

In addition, the control unit 12 instructs broadcasting for each of some target cells (eg, 20A and 20B), while the terminal device 30 broadcasts cell information broadcasted from each of some target cells (eg, 20A and 20B). Instructs to receive (S46).

In this case, the controller 12 may transmit information about each of the target cells (eg, 20A and 20B) so that the terminal device 30 may receive cell information broadcast from each of the target cells (eg, 20A and 20B). Of course, PCI and Band) are transmitted together.

Meanwhile, the terminal device 30 acquires cell information by reading the SIB1 message broadcast from each of some target cells (eg, 20A and 20B) according to an instruction from the 4G base station 10, and acquires the cell information by 4G. Transfer to base station 10.

Then, when the cell information of each of the target cells (eg, 20A and 20B) is received from the terminal device 30, the controller 12 may select one of some target cells (eg, 20A and 20B) based on the corresponding cell information. Selects (recognizes) a cell of (e.g., 20B) as a suitable cell to allow a dual connection procedure with the cell, and after completion of the selection (recognition) of each cell, some target cells (e.g., 20A, 20B) In response to the termination request message is sent to stop the broadcasting operation (S47-S49).

Subsequently, when the target cell selection (recognition) is completed, the access unit 14 connects to the 5G base station (eg, 20B) through the RACH procedure based on the selected cell information, and then the 5G base station (eg, the 4G base station 10). By performing an operation of changing an Evolved Packet Core (EPC) and a UP (User Plane) path to 20B, a procedure of setting a data radio bearer (DRB) for dual access operation may be completed (S50).

Hereinafter, a cell (modification) connection method in the 5G base station 20 according to an embodiment of the present invention will be described with reference to FIGS. 17 and 18.

First, the broadcasting control operation of the base station module 20-1 in the 5G base station 20 according to an embodiment of the present invention will be described with reference to FIG.

First, the acquisition unit 21 receives measurement information (MR, Measurement Report) measuring the signal quality of the 5G network from the terminal device 30 connected to the 5G network (S51).

In this regard, the terminal device 30 measures the signal quality of each of the plurality of wireless modules 20-2 constituting the 5G network, and measures specific conditions (RSRP / RSRQ / SINR> Threshold) while measuring the signal quality. If there is a target cell that satisfies, the measurement information (eg, PCI) for the cell is transmitted to the base station module 20-1 based on the SRB3.

Then, the control unit 22 has two or more target cells from the measurement information received from the terminal device 30, and these two or more target cells (for example, 20-2A and 20-2B) belong to a cell managed by it. If it is confirmed that, instructing to broadcast the cell information in each of two or more target cells (for example, 20-2A, 20-2B) (S52-S53).

In this case, each of two or more target cells (eg, 20-2A and 20-2B) may broadcast cell information through an SIB1 message.

In addition, the control unit 22 instructs broadcasting for each of two or more target cells (eg, 20-2A and 20-2B), and the terminal device 30 provides two or more target cells (eg, 20-2A and 20). -2B) instructs to receive the cell information broadcast from each (S54).

In this case, the controller 22 may instruct reception of cell information through an RRC connection reconfiguration with the terminal device 30, and the terminal device 30 may have two or more target cells (eg, 20-2A). 20-2B) also transmits information (PCI) for each of two or more target cells (for example, 20-2A and 20-2B) together to receive cell information broadcasted from each other.

Meanwhile, the terminal device 30 acquires cell information by reading the SIB1 message broadcast from each of two or more target cells (eg, 20-2A and 20-2B) according to an instruction from the base station module 20-1. The cell information is transmitted to the base station module 20-1.

Furthermore, when the cell information of each of two or more target cells (eg, 20-2A and 20-2B) is received from the terminal device 30, the controller 22 may use two or more target cells (eg, 20) based on the corresponding cell information. By selecting (recognizing) one cell 20-2A among -2A and 20-2B as a suitable cell, the connection unit 23 can perform a change connection to the selected (recognized) cell for the terminal device 30. (S55-S57).

Next, a location-based broadcasting control operation of the base station module 20-1 in the 5G base station 20 according to an embodiment of the present invention will be described with reference to FIG. 18.

First, the acquisition unit 21 receives measurement information (MR, Measurement Report) measuring the signal quality of the 5G network from the terminal device 30 connected to the 5G network.

In this regard, the terminal device 30 measures the signal quality of each of the plurality of wireless modules 20-2 constituting the 5G network, and measures specific conditions (RSRP / RSRQ / SINR> Threshold) while measuring the signal quality. If there is a target cell that satisfies, the measurement information (eg, PCI) for the cell is transmitted to the base station module 20-1 based on the SRB3.

Then, the controller 22 determines that two or more target cells (eg, three or more) are identified from the measurement information, and that two or more target cells (for example, 20-2A, 20-2B, and 20-C) all have their own. When belongs to, only for some target cells (eg 20-2A, 20-2B) within two or more target cells (eg 20A, 20B, 20C) within a certain distance (d) from the control module 20-1. Instructs to broadcast (S62-S64).

In addition, the control unit 22 instructs broadcasting for each of some target cells (eg, 20-2A and 20-2B), and broadcasts from some target cells (eg, 20A and 20B) to the terminal device 30. Instructs to receive the cast cell information (S65).

In this case, the controller 22 may allow the terminal device 30 to receive cell information broadcast from each of some target cells (eg, 20-2A and 20-2B), respectively. Of course, information about (PCI) is also transmitted.

Meanwhile, the terminal device 30 acquires cell information by reading the SIB1 message broadcast from each of two or more target cells (eg, 20-2A and 20-2B) according to an instruction from the base station module 20-1. The cell information is transmitted to the base station module 20-1.

In addition, when the cell information regarding each of the target cells (eg, 20-2A and 20-2B) is received from the terminal device 30, the controller 22 may use two or more target cells (eg, 20) based on the corresponding cell information. By selecting (recognizing) one cell 20-2A among -2A and 20-2B as a suitable cell, the connection unit 23 can perform a change connection to the selected (recognized) cell for the terminal device 30. (S66-S68).

As described above, according to the configuration and operation method of each configuration in the communication environment according to an embodiment of the present invention, dual connection (EN-DC, E-UTRAN New Radio) in 5G Non-Standalone (NSA) system Dual Connectivity) operation, the cell list is set manually by suggesting a method of automatically constructing a cell list to support dual connectivity from the master node 4G base station 10 to the secondary node 5G base station 20. In this case, it is possible to prevent the operation overhead incurred and additional costs. In addition, with respect to the beamforming operation performed in the 5G system, it is possible to minimize the beamforming-based broadcasting operation that increases the system complexity and decreases the resource utilization efficiency, which facilitates the operation / management of the NSA system, thereby allowing the operator to additionally Reduce investment / operation costs.

On the other hand, the operating method according to an embodiment of the present invention, may be implemented in the form of program instructions that can be executed by various computer means may be recorded on a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. Program instructions recorded on the media may be those specially designed and constructed for the purposes of the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts. Examples of computer readable recording media include magnetic media such as hard disks, floppy disks and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks such as floppy disks. Magneto-optical media, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine code, such as produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware device described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

Although the present invention has been described in detail with reference to preferred embodiments, the present invention is not limited to the above-described embodiments, and the technical field to which the present invention belongs without departing from the gist of the present invention as claimed in the following claims. Anyone skilled in the art will have the technical idea of the present invention to the extent that various modifications or changes are possible.

According to the access device and the cell list registration method of the access device according to the present invention, in connection with the operation of the dual-connection (EN-DC, E-UTRAN New Radio Dual Connectivity) in the 5G NSA (N-Standalone) system, As it can automatically configure a cell list to support dual connectivity from a 4G base station to a 5G base station, which is a secondary node, it is possible to overcome the limitations of the existing technology. It is an invention with industrial applicability because it is not only sufficient for business, but also practically evident.

10: 4G base station
11: acquisition unit 12: control unit
13: register 14: connection
15: linkage
20: 5G base station
20-1: base station module
21: acquisition unit 22: control unit
23: connection
20-2: wireless module
30: terminal device
31: transmission unit 32: acquisition unit
40: network device

Claims (17)

An acquisition unit for obtaining measurement information measuring signal quality of a second network different from the first network from a terminal device connected to the first network;
If the target cell identified from the measurement information does not exist in the cell list for supporting the dual access to the second network for the terminal device, the terminal device obtains cell information of the target cell from the second network. A control unit for acquiring; And
And a registration unit which receives the cell information obtained from the second network from the terminal device and registers the cell information in the cell list. The method of claim 1,
The control unit,
And instructing the terminal device to obtain cell information of the target cell from the second network through RRC connection reconfiguration with the terminal device. The method of claim 1,
The access device,
If the target cell identified from the measurement information does not exist in the cell list, the information of the target cell identified from the measurement information is transmitted to the network device of the first network separately from the control unit.
And an interlocking unit configured to receive cell information identified based on at least one of the information of the target cell and the location information of the access device from the network device and register the cell information in the cell list. The method of claim 3, wherein
Cell information confirmed by the network device,
And at least one of the target cell and an adjacent cell located within a set distance from the location information of the access device. The method of claim 1,
The control unit,
When two or more target cells exist in the cell list, at least some of the two or more target cells broadcast cell information in each cell, and the terminal apparatus is instructed to receive cell information broadcasted from the at least some cells. Access device, characterized in that. The method of claim 5,
Each of the at least some cells,
And accessing cell information through a System Information Block 1 (SIB1) message. The method of claim 5,
The at least some cells,
And an adjacent cell located within a set distance from the location information of the access device. A terminal apparatus capable of dual connection to a first network and a second network different from the first network,
In accordance with the connection to the first network, measurement information measuring the signal quality of the second network is transmitted to an access device, whereby a target cell for which the access device is identified from the measurement information is transmitted to the terminal device. A transmitter configured to determine whether the cell list exists for supporting dual access to a mobile station; And
Preamble, time of a Physical Random Access Channel (PRACH) specified in a MIB (Master Information Block) from the second network, in response to a request from the access device when the target cell does not exist in the cell list. requesting cell information of the target cell from the second network based on at least one resource of a time and a frequency, and requesting the cell information of the target cell through a radio resource message (RRC) message from the second network. And an acquiring unit configured to receive cell information and to transmit the received cell information of the target cell to the access device so that the access device registers the cell information of the target cell in the cell list. . An acquisition unit for obtaining measurement information for measuring signal quality of a second network different from the first network from a terminal device connected to the first network;
When there are two or more target cells identified from the measurement information, and the two or more target cells exist in the cell list for supporting the dual access to the second network for the terminal device, among the two or more target cells. A control unit that broadcasts cell information in at least some cells, the terminal apparatus instructing to receive cell information broadcasted from the at least some cells; And
And a connection unit for allowing the terminal device to connect to one of the at least some cells based on the cell information received by the terminal device. The method of claim 9,
The at least some cells,
And an adjacent cell located within a set distance from the location information of the access device. In the cell list registration method in the access device,
An acquiring step of acquiring measurement information of measuring signal quality of a second network different from the first network from a terminal device connected to the first network;
If the target cell identified from the measurement information does not exist in the cell list for supporting the dual access to the second network for the terminal device, the terminal device obtains cell information of the target cell from the second network. A control step of acquiring; And
And registering the cell information obtained from the second network from the terminal device in the cell list. The method of claim 11,
The terminal device,
And obtaining cell information from the second network through a random access channel (RACH) procedure with the second network. The method of claim 11,
The method,
If the target cell identified from the measurement information does not exist in the cell list, the information of the target cell identified from the measurement information is transmitted to the network device of the first network separately from the control step,
And a linkage step of receiving, from the network apparatus, cell information identified based on at least one of the information of the target cell and the location information of the access device and registering the cell information in the cell list. . The method of claim 13,
Cell information confirmed by the network device,
And at least one of the target cell and adjacent cells located within a set distance from the location information of the access device. The method of claim 11,
The control step,
When there are two or more target cells in the cell list, at least some of the two or more target cells broadcast cell information in each cell, and the terminal apparatus is instructed to receive cell information broadcasted from the at least some cells. A cell list registration method, characterized in that. The method of claim 15,
Each of the at least some cells,
A cell list registration method comprising broadcasting cell information through a System Information Block 1 (SIB1) message. The method of claim 15,
The at least some cells,
And a neighboring cell located within a set distance from the positional information of the access device.

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