KR20210078106A - Method and user device for executing handover between base stations included in disaster communication network - Google Patents

Abstract

A method for performing a handover between base stations included in a disaster communication network comprises the steps of: receiving an access request for a first base station included in the disaster communication network from a user terminal; setting a blacklist cell and a handover condition based on the received access request; transmitting a message including the set blacklist cell information and the at least one handover condition to the user terminal; receiving, from the user terminal, event occurrence information detected based on the handover condition and the signal strength of the first base station; and releasing the designated blacklist cell when the received event occurrence information corresponds to the handover condition. The handover is performed between the user terminal and a second base station included in the disaster communication network.

Description

Method and user terminal for performing handover between base stations included in disaster communication network {METHOD AND USER DEVICE FOR EXECUTING HANDOVER BETWEEN BASE STATIONS INCLUDED IN DISASTER COMMUNICATION NETWORK}

The present invention relates to a method and a user terminal for performing handover between base stations included in a disaster communication network.

Disaster safety communication network (public safety-LTE) integrates the wireless communication networks of disaster response organizations such as the police, firefighting, national defense, and local governments into one to protect the health and safety of the people and minimize national damage in the event of a disaster. It means an integrated network that is being promoted.

In the past, there was a problem that disaster response agencies had difficulties in communicating with each other because they had different frequency bands and communication methods such as VHF, UHF, and TRS, which made it difficult to respond quickly and systematically. could be

In relation to such a disaster safety communication network, Korean Patent Registration No. 10-1809042, which is a prior art, discloses an integrated system for simultaneous service of ps-lte and tetra, a broadband public safety communication network for disaster safety.

However, in the case of PS-LTE, LTE-M, and LTE-R, which are disaster safety communication networks, since the same frequency is shared and used, interference occurs between the corresponding frequencies. Therefore, there is a need for a method for effectively providing a communication service even when signals between disaster safety communication networks overlap.

Upon receiving a request for access to the first base station included in the disaster communication network from the user terminal, a blacklist cell and handover condition are set based on the received access request, and the set blacklist cell information and at least one handover condition are obtained. An object of the present invention is to provide a method and a user terminal for performing handover between base stations included in a disaster network for transmitting a message including a message to a user terminal.

Upon reception of the event occurrence information detected based on the handover condition and the signal strength of the first base station from the user terminal, when the received event occurrence information corresponds to the handover condition, the specified blacklist cell is released, thereby communicating with the user terminal An object of the present invention is to provide a method for performing handover between base stations included in a disaster communication network so that handover between second base stations included in the disaster network is performed.

However, the technical problems to be achieved by the present embodiment are not limited to the technical problems described above, and other technical problems may exist.

As a means for achieving the above-described technical problem, an embodiment of the present invention includes the steps of receiving an access request for a first base station included in a disaster communication network from a user terminal, and a blacklist cell based on the received access request. Setting a (Blacklist Cell) and handover condition, transmitting a message including the set blacklist cell information and the at least one handover condition to the user terminal, the handover condition and the first base station Receiving event occurrence information detected based on signal strength from the user terminal, and releasing the designated blacklist cell when the received event occurrence information corresponds to the handover condition, wherein the user It is possible to provide a method for performing handover in which handover is performed between a terminal and a second base station included in the disaster communication network.

Another embodiment of the present invention is a message including a connection unit connecting to a first base station included in a disaster communication network, blacklist cell information set by the first base station from the connected first base station, and at least one handover condition a receiving unit for receiving the at least one handover condition and a detection unit for detecting the occurrence of at least one event based on the signal strength of the first base station; A user terminal comprising: a transmitter for transmitting to a base station; and a handover performer for performing handover to a second base station included in the disaster communication network when the at least one detected event corresponds to the at least one handover condition can provide

Another embodiment of the present invention provides the steps of transmitting an access request to the first base station included in the disaster communication network to the first base station, accessing the first base station, handover conditions, and a signal of the first base station Determining whether an event has occurred based on the intensity, when the event occurs, transmitting event occurrence information for the event to the first base station, and requesting access to a second base station included in the disaster communication network. It is possible to provide a method for performing a handover comprising transmitting to a first base station and accessing the second base station.

The above-described problem solving means are merely exemplary, and should not be construed as limiting the present invention. In addition to the exemplary embodiments described above, there may be additional embodiments described in the drawings and detailed description.

According to any one of the above-described problem solving means of the present invention, in the case of a disaster safety communication network, interference between frequencies occurs as the same frequency is used in the disaster safety communication network. A method and a user terminal for performing a handover to be avoided can be provided.

When the signal strength of the first base station included in the disaster safety communication network corresponds to the weak pharmacopeia section, the user terminal performs handover to the second base station through RAN (Radio Access Network) sharing between the first base station and the second base station. A method and a user terminal may be provided.

1A and 1B are block diagrams of a system for performing handover according to an embodiment of the present invention.
2 is a block diagram of a first base station according to an embodiment of the present invention.
3 is a flowchart of a method for performing handover between base stations included in a disaster communication network according to an embodiment of the present invention.
4 is a block diagram of a user terminal according to an embodiment of the present invention.
5 is a flowchart of a method of performing handover for a base station included in a disaster communication network in a user terminal according to an embodiment of the present invention.
6 is a flowchart of a method of performing handover for a base station included in a disaster communication network in a user terminal according to another embodiment of the present invention.
7 is an exemplary diagram for explaining a process of performing handover between base stations included in a disaster communication network based on a first path of a user terminal in a handover performing system according to an embodiment of the present invention.
8 is an exemplary diagram for explaining a process of performing a handover between base stations included in a disaster communication network based on a second path of a user terminal in a handover performing system according to an embodiment of the present invention.
9 is an exemplary diagram for explaining a process of performing handover between base stations included in a disaster communication network based on a third path of a user terminal in a handover performing system according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement them. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

Throughout the specification, when a part is "connected" with another part, this includes not only the case of being "directly connected" but also the case of being "electrically connected" with another element interposed therebetween. . Also, when a part "includes" a component, it means that other components may be further included, rather than excluding other components, unless otherwise stated, and one or more other features However, it is to be understood that the existence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded in advance.

In this specification, a "part" includes a unit realized by hardware, a unit realized by software, and a unit realized using both. In addition, one unit may be implemented using two or more hardware, and two or more units may be implemented by one hardware.

Some of the operations or functions described as being performed by the terminal or device in the present specification may be instead performed by a server connected to the terminal or device. Similarly, some of the operations or functions described as being performed by the server may also be performed in a terminal or device connected to the server.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1A and 1B are block diagrams of a system for performing handover according to an embodiment of the present invention. Referring to FIG. 1A , a handover performing system 1 may include a first base station 110 , a second base station 120 , and a user terminal 130 . The first base station 110 , the second base station 120 , and the user terminal 130 exemplarily illustrate components that can be controlled by the handover performing system 1 .

Each component of the handover performing system 1 of FIG. 1 is generally connected through a network. For example, as shown in FIG. 1 , the user terminal 130 may be connected to the first base station 110 or the second base station 120 at the same time or at a time interval.

A network refers to a connection structure that enables information exchange between each node, such as terminals and servers, and includes a local area network (LAN), a wide area network (WAN), and the Internet (WWW: World). Wide Web), wired and wireless data communication networks, telephone networks, wired and wireless television networks, and the like. Examples of wireless data communication networks include 3G, 4G, 5G, World Interoperability for Microwave Access (WIMAX), Wi-Fi, Bluetooth communication, infrared communication, ultrasonic communication, Visible Light Communication (VLC), and LiFi (LiFi). ), etc., but are not limited thereto.

The first base station 110 may receive an access request for the first base station 110 included in the disaster communication network from the user terminal 130 . For example, the first base station 110 may receive an initial call connection request to the first base station 110 included in the disaster communication network from the user terminal 130 . Here, the disaster communication network may include PS-LTE, which is a disaster safety communication network, LTE-R, which is an integrated railway wireless network, LTE-M, which is a high-speed maritime wireless communication network, and the like, and the first base station 110 and the second base station 120 are It falls under any one of these, and all of these disaster networks jointly use a frequency band of 700 MHz.

The first base station 110 may set a blacklist cell and handover condition based on the received access request. For example, the first base station 110 sets the blacklist cell in relation to the Physical Cell Identity (PCI) set in the disaster network based on the received initial call connection request, and sets the first event including the occurrence condition of the first event. 1 Handover conditions can be set.

The first base station 110 may transmit a message including the configured blacklist cell information and at least one handover condition to the user terminal 130 .

The first base station 110 receives the event occurrence information detected based on the handover condition and the signal strength of the first base station 110 from the user terminal 130, and the received event occurrence information corresponds to the handover condition. In this case, the designated blacklist cell may be released.

According to an embodiment, the first base station 110 may receive event generation information for the first event detected based on the first handover condition and the signal strength of the first base station 110 from the user terminal 130 . can

The first base station 110 releases the blacklist cell set based on the received event occurrence information for the first event, and the second hand including the occurrence condition of the second event and the RAN (Radio Access Network) sharing operation parameter Over condition can be set. Here, RAN sharing refers to a technology for sharing radio access equipment.

The first base station 110 may transmit a message including the released blacklist cell information and the set second handover condition to the user terminal 130 .

Thereafter, the first base station 110 may receive a handover request from the user terminal 130 to the second base station 120 .

The first base station 110 may perform communication for sharing a radio access network (RAN) with the second base station 120 based on the received handover request.

The first base station 110 may transmit a message including information on the target cell of the second base station 120 to the user terminal 130 based on communication for RAN sharing. In this case, a handover between the second base station 120 and the user terminal 130 may be performed based on the information on the target cell of the second base station 120 .

According to another embodiment, the first base station 110 may receive event generation information for the second event detected based on the second handover condition and the signal strength of the first base station 110 from the user terminal 130 . can

The first base station 110 sets a blacklist cell in relation to the PCI set in the disaster communication network based on the received event occurrence information for the second event, and releases the first event occurrence condition and RAN (Radio Access Network) sharing A third handover condition including parameters may be set.

The first base station 110 may transmit a message including the configured blacklist cell and the third handover condition to the user terminal 130 .

The user terminal 130 may access the first base station 110 included in the disaster communication network. For example, the user terminal 130 may access the first base station 110 by requesting an initial call connection to the first base station 110 .

The user terminal 130 may receive a message including blacklist cell information set by the first base station 110 and at least one handover condition from the connected first base station 110 . For example, the user terminal 130 includes the blacklist cell information set by the first base station 110 based on the initial call connection request from the first base station 110 and the first hand including the occurrence condition of the first event. A message including an over condition may be received.

The user terminal 130 may detect the occurrence of at least one event based on at least one handover condition and the signal strength of the first base station 110 .

The user terminal 130 transmits event generation information on at least one detected event to the first base station 110, and when the at least one detected event corresponds to at least one handover condition, the user terminal 130 ) may perform handover to the second base station 120 included in the disaster communication network.

According to an embodiment, the user terminal 130 detects the occurrence of the first event based on the first handover condition and the signal strength of the first base station 110, and the transmitter 440 detects the first event transmits the event occurrence information for the first base station 110 to the first base station 110, and the receiving unit 420 generates the second event condition along with the blacklist cell information released by the first base station 110 from the first base station 110 and a second handover condition including a radio access network (RAN) shared operation parameter may be received.

The user terminal 130 may transmit a handover request to the second base station 120 to the first base station 110 . In this case, communication for RAN sharing between the first base station 110 and the second base station 120 may be performed based on the handover request.

The user terminal 130 receives a message including information on a target cell of the second base station 120 from the first base station 110 based on communication for RAN sharing, and the handover performing unit 450 performs the RAN Handover to the second base station 120 may be performed based on the shared operation parameter and information on the target cell of the second base station 120 .

According to another embodiment, after the handover to the second base station 120 is performed, the user terminal 130 detects a second event based on the second handover condition and the signal strength of the first base station 110 and , the transmitter 440 may transmit event generation information for the detected second event to the first base station 110 .

The user terminal 130 is a message including a third handover condition including the occurrence condition of the first event and the RAN sharing release parameter together with the blacklist cell set by the first base station 110 from the first base station 110 can receive

Referring to FIG. 1B , when the user terminal 130 located at a first location 131 accesses the first base station 110 , the RSRP (Reference Signal Received Power) of the first base station 110 may be the highest. .

At this time, when the user terminal 130 moves to the second location 132 through the moving means 140 , and becomes close to the second base station 120 , the RSRP of the first base station 110 is lowered. can be checked

As such, when the RSRP of the first base station 110 is lowered, the user terminal 130 performs handover to the second base station 120 through RAN sharing between the first base station 110 and the second base station 120 . can make it work.

2 is a block diagram of a first base station according to an embodiment of the present invention. 1A to 2 , it may include a receiving unit 210 , a setting unit 220 , a transmitting unit 230 , a receiving unit 240 , and a RAN shared communication performing unit 250 .

The receiver 210 may receive a request for access to the first base station 110 included in the disaster communication network from the user terminal 130 . For example, the receiver 210 may receive an initial call connection request for the first base station 110 included in the disaster communication network from the user terminal 130 . Here, the disaster communication network may include a disaster safety communication network PS-LTE, an integrated railway wireless network LTE-R, and a high-speed maritime wireless communication network LTE-M, etc. All of these disaster communication networks use a 700 MHz frequency band in common. .

The setting unit 220 may set the blacklist cell and handover condition based on the received access request. Here, when the user terminal 130 and the first base station 110 are connected, the blacklist cell means a cell in which the user terminal 130 is set not to be connected to a cell of another base station. For example, the setting unit 220 sets a blacklist cell in relation to the PCI set in the disaster communication network based on the received initial call connection request, and sets a first handover condition including a first event occurrence condition. can Here, the PCI is a number assigned to each cell (a total of 504 numbers are assigned from 0 to 503), and the PCI allows the user terminal 130 to communicate with the corresponding cell through the PCI number. The process of setting the blacklist cell will be described with reference to Table 1 below.

division PCI band Number (504 in total) PS-LTE 0 to 350 351 pieces LTE-M 421 to 490 70 pieces LTE-R 351 ~ 420 70 pieces Reserved 491 to 503 13 pieces

Referring to Table 1, when the first base station 110 corresponds to PS-LTE, the setting unit 220 may set all cells except for the cells having PCI of 0 to 350 as blacklist cells. This is to prevent the signals of the first base station 110 from interfering with other base stations by using the same frequency band in all disaster networks.

The transmitter 230 may transmit a message including the configured blacklist cell information and at least one handover condition to the user terminal 130 . For example, the transmitter may transmit the blacklist cell information and the handover condition to the user terminal 130 through the RRC_Reconfig message.

The receiver 210 may receive event occurrence information detected based on the handover condition and the signal strength of the first base station 110 from the user terminal 130 .

When the received event occurrence information corresponds to the handover condition, the setting unit 220 may release the designated blacklist cell. In this case, when the signal of the first base station 110 corresponds to the weak electric field, the user terminal 130 may release the blacklist cell to handover to another base station having a stronger signal strength.

According to an embodiment, the receiving unit 210 may receive event generation information on the first event detected based on the first handover condition and the signal strength of the first base station 110 from the user terminal 130 . . Here, the first event may mean that the signal strength of the first base station 110 corresponds to a weak electric field.

The setting unit 220 releases the set blacklist cell based on the received event occurrence information for the first event, and the second handover including the occurrence condition of the second event and the RAN (Radio Access Network) sharing operation parameter You can set conditions.

The transmitter 230 may transmit a message including the released blacklist cell information and the set second handover condition to the user terminal 130 .

The receiver 210 may receive a handover request from the user terminal 130 to the second base station 120 .

The RAN sharing communication performing unit 250 may perform RAN sharing communication with the second base station 120 based on the received handover request. For example, the RAN sharing communication performing unit 250 may request the second base station 120 to share the RAN, and receive a response to the RAN sharing request from the second base station 120 .

The transmitter 230 may transmit a message including information on the target cell of the second base station 120 to the user terminal 130 based on communication for RAN sharing. In this case, a handover between the second base station 120 and the user terminal 130 may be performed based on the information on the target cell of the second base station 120 .

According to another embodiment, the receiver 210 may receive event generation information on the second event detected based on the second handover condition and the signal strength of the first base station 110 from the user terminal 130 . . Here, the second event means that the signal strength of the first base station 110 corresponds to a medium strong field in a state in which the blacklist cell is released or the user terminal 130 is not handed over to the second base station 110 . can

The setting unit 220 sets the blacklist cell in relation to the PCI set in the disaster communication network based on the received event occurrence information for the second event, the occurrence condition of the first event and the RAN (Radio Access Network) sharing release parameter A third handover condition including

The transmitter 230 may transmit a message including the configured blacklist cell and the third handover condition to the user terminal 130 .

3 is a flowchart of a method for performing handover between base stations included in a disaster communication network according to an embodiment of the present invention. The method of performing handover between base stations included in the disaster communication network, performed by the first base station 110 shown in FIG. 3 is clocked by the handover performing system 1 according to the embodiment shown in FIGS. 1A to 2 . thermally treated steps. Therefore, even if omitted below, it is also applied to the method of performing handover between the base stations included in the disaster communication network in the first base station 110 according to the embodiment shown in FIGS. 1A to 2 .

In step S310 , the first base station 110 may receive an access request for the first base station 110 included in the disaster communication network from the user terminal 130 .

In step S320, the first base station 110 may set a blacklist cell and handover condition based on the received access request.

In step S330 , the first base station 110 may transmit a message including the configured blacklist cell information and at least one handover condition to the user terminal 130 .

In step S340 , the first base station 110 may receive event occurrence information detected based on the handover condition and the signal strength of the first base station 110 from the user terminal 130 .

In step S350, when the received event occurrence information corresponds to the handover condition, the first base station 110 may release the designated blacklist cell.

In the above description, steps S310 to S350 may be further divided into additional steps or combined into fewer steps, according to an embodiment of the present invention. In addition, some steps may be omitted if necessary, and the order between the steps may be switched.

4 is a block diagram of a user terminal according to an embodiment of the present invention. Referring to FIG. 4 , the user terminal 130 may include a connection unit 410 , a reception unit 420 , a detection unit 430 , a transmission unit 440 , and a handover performing unit 450 .

The connection unit 410 may connect to the first base station 110 included in the disaster communication network. For example, the access unit 410 may connect to the first base station 110 by requesting an initial call connection to the first base station 110 .

The receiving unit 420 may receive a message including blacklist cell information set by the first base station 110 and at least one handover condition from the connected first base station 110 .

The receiving unit 420 includes a first handover condition including blacklist cell information set by the first base station 110 based on the initial call connection request from the first base station 110 and a first event occurrence condition. message can be received.

The detector 430 may detect the occurrence of at least one event based on at least one handover condition and the signal strength of the first base station 110 . For example, the detection unit 430 may detect the occurrence of at least one event by using Reference Signal Received Power (RSRP) for the signal of the first base station 110 . Here, RSRP means the strength of the serving cell signal received by the user terminal.

The transmitter 440 may transmit event generation information on at least one detected event to the first base station 110 . When the at least one detected event corresponds to at least one handover condition, the handover performing unit 450 may perform a handover to the second base station 120 included in the disaster communication network.

According to an embodiment, the detection unit 430 may detect the occurrence of the first event based on the first handover condition and the signal strength of the first base station 110 . Here, the first event may mean that the signal strength of the first base station 110 corresponds to a weak electric field.

The transmitter 440 transmits event generation information for the detected first event to the first base station 110 , and the receiver 420 transmits the black released by the first base station 110 from the first base station 110 . A message including a second handover condition including an occurrence condition of the second event and a RAN shared operation parameter along with the list cell information may be received.

The transmitter 440 may transmit a handover request to the second base station 120 to the first base station 110 . In this case, communication for RAN sharing between the first base station 110 and the second base station 120 may be performed based on the handover request.

The receiving unit 420 receives a message including information on the target cell of the second base station 120 from the first base station 110 based on the communication for sharing the RAN, and the handover performing unit 450 is the RAN sharing The handover to the second base station 120 may be performed based on the operation parameter and information on the target cell of the second base station 120 .

According to another embodiment, after the handover to the second base station 120 is performed, the detector 430 may detect the second event based on the second handover condition and the signal strength of the first base station 110 . have. Here, the second event means that the signal strength of the first base station 110 corresponds to a medium strong field in a state in which the blacklist cell is released or the user terminal 130 is not handed over to the second base station 110 . can

The transmitter 440 may transmit event generation information on the detected second event to the first base station 110 .

The receiving unit 420 receives a message including a third handover condition including the occurrence condition of the first event and the RAN sharing release parameter together with the blacklist cell set by the first base station 110 from the first base station 110 can receive

5 is a flowchart of a method of performing handover for a base station included in a disaster communication network in a user terminal according to an embodiment of the present invention. The method of performing handover for the base station included in the disaster communication network in the user terminal 130 shown in FIG. 5 is time-series by the handover performing system 1 according to the embodiment shown in FIGS. 1A to 4 . processing steps. Therefore, even if omitted below, it is also applied to the method of performing handover between base stations included in the disaster communication network in the user terminal 130 according to the embodiment shown in FIGS. 1A to 4 .

In step S510, the user terminal 130 may access the first base station 110 included in the disaster communication network.

In step S520 , the user terminal 130 may receive a message including blacklist cell information and at least one handover condition set by the first base station 110 from the connected first base station 110 . have.

In step S530, the user terminal 130 may detect the occurrence of at least one event based on at least one handover condition and the signal strength of the first base station.

In step S540 , the user terminal 130 may transmit event generation information for at least one detected event to the first base station 110 .

In step S550 , when at least one detected event corresponds to at least one handover condition, the user terminal 130 may perform handover to the second base station 120 included in the disaster communication network.

In the above description, steps S510 to S550 may be further divided into additional steps or combined into fewer steps, according to an embodiment of the present invention. In addition, some steps may be omitted if necessary, and the order between the steps may be switched.

6 is a flowchart of a method of performing handover for a base station included in a disaster communication network in a user terminal according to another embodiment of the present invention. The method of performing handover from the user terminal 130 shown in FIG. 6 to the base station included in the disaster communication network is time-series by the handover performing system 1 according to the embodiment shown in FIGS. 1A to 5 . steps to be processed. Therefore, even if omitted below, it is also applied to the method of performing handover between base stations included in the disaster communication network in the user terminal 130 according to the embodiment shown in FIGS. 1A to 5 .

In step S610 , the user terminal 130 may transmit a request for access to the first base station 110 included in the disaster communication network to the first base station 110 .

In step S620 , the user terminal 130 may access the first base station 110 .

In step S630 , the user terminal 130 may determine whether an event has occurred based on the handover condition and the signal strength of the first base station 110 .

In step S640 , when an event occurs, the user terminal 130 may transmit event occurrence information for the event to the first base station 110 .

In step S650 , the user terminal 130 may transmit an access request to the second base station 120 included in the disaster communication network to the first base station 110 .

In step S660 , the user terminal 130 may access the second base station 120 .

In the above description, steps S610 to S660 may be further divided into additional steps or combined into fewer steps according to an embodiment of the present invention. In addition, some steps may be omitted if necessary, and the order between the steps may be switched.

7 is an exemplary diagram for explaining a process of performing handover between base stations included in a disaster communication network based on a first path of a user terminal in a handover performing system according to an embodiment of the present invention. Referring to FIG. 7 , the handover performing system 1 may include a first base station 110 , a second base station 120 , and a user terminal 130 . In this case, the user terminal 130 is mounted on the moving means 140 , and the location of the user terminal 130 may be moved through the moving means 140 .

For example, it is assumed that the mobile means 140 starts from the first base station 110 , approaches the second base station 120 , and then travels along a first path to return to the first base station 110 again. . At this time, the user terminal 130 is provided with a communication service through the first disaster communication network 700 of the first base station 110, and when approaching the second base station 120, the second of the second base station 120 After receiving the communication service through the disaster communication network 701 , when returning to the first base station 110 again, the communication service can be provided through the first disaster communication network 700 of the first base station 110 .

The user terminal 130 located close to the first base station 110 may request an initial call connection to the first base station 110 (S710).

After being connected to the user terminal 130 based on the initial call connection request, the first base station 110 may transmit a message including the configured blacklist cell information and the first handover condition (S711).

Thereafter, when the user terminal 130 moves from the first base station 110 to the second base station 120 through the moving means 140 , the signal strength of the first base station 110 may gradually change to a weak electric field. (S712).

The user terminal 130 may transmit event generation information on the first event to the first base station 110 when a weak weakness of the signal strength of the first base station 110 is detected (S713).

The first base station 110 may transmit a message including the released blacklist cell information and the set second handover condition to the user terminal 130 (S714).

The user terminal 130 may request a handover to the first base station 110 (S715).

The first base station 110 may request RAN sharing to the second base station 120 based on the handover request (S716), and the second base station 110 may transmit a response to the RAN sharing request (S717).

When the first base station 110 transmits a message including information on the target cell of the second base station 120 to the user terminal 130 (S718), the user terminal 130 transmits the handover completion to the second base station (S718). 120) (S719).

The second base station 120 may transmit a handover condition including a transition condition for handover to the first base station 110 again to the user terminal 130 (S720). Here, the transition condition means that the user terminal 130 is temporarily connected to the second base station 120 through the handover, and thus may include a condition for switching the handover to the first base station 110 again.

Thereafter, when the user terminal 130 returns to the first base station 110 from the second base station 120 through the mobile means 140 , the signal strength of the first base station 110 may be gradually changed to a medium-strength electric field. There is (S721).

The user terminal 130 may request a handover to the first base station 110 from the second base station 120 (S722).

The second base station 120 may request a handover to the first base station 110 (S723), and the first base station 110 may transmit a response to the handover request (S724).

When the second base station 120 transmits a message including information on the target cell of the first base station 110 to the user terminal 130 (S725), the user terminal 130 sends a handover report to the first base station ( 110) can be reported (S726).

The first base station 110 may transmit a message including the configured blacklist cell information and the first handover condition to the user terminal 130 (S727).

In the above description, steps S710 to S727 may be further divided into additional steps or combined into fewer steps, according to an embodiment of the present invention. In addition, some steps may be omitted if necessary, and the order between the steps may be switched.

8 is an exemplary diagram for explaining a process of performing handover between base stations included in a disaster communication network based on a second path of a user terminal in a handover performing system according to an embodiment of the present invention. Referring to FIG. 8 , the handover performing system 1 may include a first base station 110 , a second base station 120 , and a user terminal 130 . At this time, the location of the user terminal 130 may be moved through the moving means 140 .

For example, the mobile means 140 starts from the first base station 110 and returns to the first base station 110 again at an intermediate point 802 between the first base station 110 and the second base station 120 . Assume we are traveling along a second route. At this time, the user terminal 130 receives a communication service through the first disaster communication network 800 of the first base station 110 , and an intermediate point 802 between the first base station 110 and the second base station 120 . , the RAN sharing condition for accessing the emergency communication network 801 of the second base station 120 is not satisfied, and as it returns to the first base station 110 again, the first disaster network of the first base station 110 ( 800) to provide a communication service.

The user terminal 130 located close to the first base station 110 may request an initial call connection to the first base station 110 (S810).

After being connected to the user terminal 130 based on the initial call connection request, the first base station 110 may transmit a message including the configured blacklist cell information and the first handover condition (S811).

Thereafter, when the user terminal 130 moves from the first base station 110 to the second base station 120 through the moving means 140 , the signal strength of the first base station 110 may gradually change to a weak electric field. (S812).

The user terminal 130 may transmit event generation information for the first event to the first base station 110 when a weak weakness of the signal strength of the first base station 110 is detected (S813).

The first base station 110 may transmit a message including the released blacklist cell information and the set second handover condition to the user terminal 130 (S814).

At this time, even though the blacklist cell is released, the user terminal 130 no longer approaches the second base station 120 and returns from the midpoint between the first base station 110 and the second base station 1200, The signal strength of the first base station 110 may be gradually changed to a medium-strength electric field (S815), and in this case, the condition for sharing the RAN may not be satisfied.

The user terminal 130 may transmit event generation information for the second event to the first base station 110 (S816).

The first base station 110 may reconfigure the released blacklist cell and transmit a message including the configured blacklist cell information and the third handover condition to the user terminal 130 (S817).

In the above description, steps S810 to S817 may be further divided into additional steps or combined into fewer steps, according to an embodiment of the present invention. In addition, some steps may be omitted if necessary, and the order between the steps may be switched.

9 is an exemplary diagram for explaining a process of performing handover between base stations included in a disaster communication network based on a third path of a user terminal in a handover performing system according to an embodiment of the present invention. Referring to FIG. 9 , the handover performing system 1 may include a first base station 110 , a second base station 120 , and a user terminal 130 . At this time, the location of the user terminal 130 may be moved through the moving means 140 .

For example, the moving means 140 starts from the first base station 110 and passes a midpoint 902 between the first base station 110 and the second base station 120 to move a part of the area of the second base station 120 . After approaching, it is assumed that the vehicle travels along a third route to return to the first base station 110 again. At this time, the user terminal 130 receives a communication service through the first disaster communication network 900 of the first base station 110 , and an intermediate point 902 between the first base station 110 and the second base station 120 . After entering a part of the area of the second disaster communication network 901 of the second base station 120 after passing through, the RAN sharing fails as it returns to the first base station 110, and when returning to the first base station 110 again , it is possible to receive a communication service through the first disaster communication network 900 of the first base station 110 .

The user terminal 130 located close to the first base station 110 may request an initial call connection to the first base station 110 (S910).

After being connected to the user terminal 130 based on the initial call connection request, the first base station 110 may transmit a message including the configured blacklist cell information and the first handover condition (S911).

Thereafter, when the user terminal 130 moves from the first base station 110 to the second base station 120 through the moving means 140 , the signal strength of the first base station 110 may gradually change to a weak electric field. (S912).

The user terminal 130 may transmit event generation information for the first event to the first base station 110 when a weak weakness of the signal strength of the first base station 110 is detected (S913).

The first base station 110 may transmit a message including the released blacklist cell information and the set second handover condition to the user terminal 130 (S914).

When the user terminal 130 is partially moved from the intermediate point 902 to the second base station 120, the weakness of the signal strength of the first base station 110 may continue (S912), and the user terminal 130 is the second base station (S912). Due to the weak signal strength of the first base station 110 , the handover request was transmitted to the first base station 110 ( S916 ), but the first base station 110 sends a handover failure message to the user terminal 130 . It can be transmitted (S917).

The user terminal 130 transmits the handover re-request to the first base station 110 (S918), but the first base station 110 may transmit a handover failure message to the user terminal 130 (S919). .

The user terminal 130 transmits the handover re-request to the first base station 110 (S920), but the first base station 110 may transmit a handover failure message to the user terminal 130 (S921). .

Thereafter, when the user terminal 130 returns toward the first base station 110 , the signal strength of the first base station 110 may gradually change to a medium strong electric field ( S922 ), and the user terminal 130 returns to the first base station 110 . Event generation information for the event may be transmitted to the first base station 110 (S923).

The first base station 110 may transmit a message including the configured blacklist cell information and the third handover condition to the user terminal 130 (S924).

In the above description, steps S910 to S924 may be further divided into additional steps or combined into fewer steps, according to an embodiment of the present invention. In addition, some steps may be omitted if necessary, and the order between the steps may be switched.

The method for performing handover between base stations included in the disaster communication network described with reference to FIGS. 1 to 9 is also implemented in the form of a computer program stored in a medium executed by a computer or a recording medium including instructions executable by the computer. can be Also, the method for performing handover between base stations included in the disaster communication network described with reference to FIGS. 1 to 9 may be implemented in the form of a computer program stored in a medium executed by a computer.

Computer-readable media can be any available media that can be accessed by a computer and includes both volatile and nonvolatile media, removable and non-removable media. Also, computer-readable media may include computer storage media. Computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data.

The above description of the present invention is for illustration, and those of ordinary skill in the art to which the present invention pertains can understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented in a dispersed form, and likewise components described as distributed may be implemented in a combined form.

The scope of the present invention is indicated by the following claims rather than the above detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention. do.

110: first base station
120: second base station
130: user terminal
140: means of transportation
210: receiver
220: setting unit
230: transmission unit
240: receiver
250: communication execution unit
410: connection
420: receiver
430: detection unit
440: transmission unit
450: handover execution unit

Claims (19)

A method for performing handover between base stations included in a disaster communication network, the method comprising:
receiving a request for access to a first base station included in the disaster communication network from a user terminal;
setting a blacklist cell and a handover condition based on the received access request;
transmitting a message including the configured blacklist cell information and the at least one handover condition to the user terminal;
receiving event occurrence information detected based on the handover condition and the signal strength of the first base station from the user terminal; and
When the received event occurrence information corresponds to the handover condition, releasing the set blacklist cell;
Handover is performed between the user terminal and a second base station included in the disaster communication network.
The method of claim 1,
Receiving the access request comprises:
Receiving an initial call connection request from the user terminal,
Setting the blacklist cell and the handover condition comprises:
setting the blacklist cell in relation to the PCI configured in the disaster communication network based on the received access request; and
Setting a first handover condition including a first event occurrence condition
That comprising a, handover performing method.
3. The method of claim 2,
receiving event occurrence information on the first event detected based on the first handover condition and the signal strength of the first base station from the user terminal;
releasing the set blacklist cell based on the received event occurrence information for the first event;
setting a second handover condition including a second event occurrence condition and a RAN (Radio Access Network) shared operation parameter; and
Transmitting a message including the released blacklist cell information and the set second handover condition to the user terminal
Which will further include, a handover performing method.
4. The method of claim 3,
receiving a handover request from the user terminal to the second base station;
performing communication for RAN sharing with the second base station based on the received handover request; and
Transmitting a message including information on the target cell of the second base station to the user terminal based on the communication for sharing the RAN
further comprising,
Handover between the second base station and the user terminal is performed based on the information on the target cell of the second base station.
4. The method of claim 3,
Receiving event generation information for a second event detected based on the second handover condition and the signal strength of the first base station from the user terminal
Which will further include, a handover performing method.
6. The method of claim 5,
setting the blacklist cell in relation to the PCI set in the disaster communication network based on the received event occurrence information for the second event;
setting a third handover condition including an occurrence condition of the first event and a RAN sharing release parameter; and
Transmitting a message including the configured blacklist cell and the third handover condition to the user terminal
Which will further include, a handover performing method.
In a user terminal performing handover between base stations included in a disaster communication network,
a connection unit for connecting to a first base station included in the disaster communication network;
a receiving unit for receiving a message including blacklist cell information set by the first base station and at least one handover condition from the connected first base station;
a detection unit configured to detect occurrence of at least one event based on the at least one handover condition and the signal strength of the first base station;
a transmitter configured to transmit event generation information on the detected at least one event to the first base station; and
When the at least one detected event corresponds to the at least one handover condition, the handover performing unit performs handover to a second base station included in the disaster communication network.
Containing, the user terminal.
8. The method of claim 7,
The access unit requests an initial call connection to the first base station and connects to the first base station,
The receiving unit receives, from the first base station, a message including a first handover condition including blacklist cell information set by the first base station based on the request for the initial call connection and a first event occurrence condition. That is, the user terminal.
9. The method of claim 8,
The detection unit detects the occurrence of the first event based on the first handover condition and the signal strength of the first base station,
The transmitter transmits event generation information for the detected first event to the first base station,
The receiving unit includes a second handover condition including the occurrence condition of the second event and the RAN (Radio Access Network) sharing operation parameter together with the blacklist cell information released by the first base station from the first base station To receive, the user terminal.
10. The method of claim 9,
The transmitter transmits a handover request to the second base station to the first base station,
Based on the handover request, communication for RAN sharing between the first base station and the second base station is performed, the user terminal.
11. The method of claim 10,
The receiving unit receives a message including information on a target cell of the second base station from the first base station based on the communication,
The handover performing unit performs handover to the second base station based on the RAN shared operation parameter and information on the target cell of the second base station.
12. The method of claim 11,
After the handover to the second base station is performed, the detector detects the second event based on the second handover condition and the signal strength of the first base station,
The transmitting unit will transmit event generation information for the detected second event to the first base station, the user terminal.
13. The method of claim 12,
The receiving unit receives, from the first base station, a message including a third handover condition including an occurrence condition of the first event and a RAN sharing release parameter together with a blacklist cell set by the first base station, user terminal.
A method for performing handover from a user terminal to a base station included in a disaster communication network, the method comprising:
transmitting an access request for a first base station included in the disaster communication network to the first base station;
accessing the first base station;
determining whether an event has occurred based on a handover condition and a signal strength of the first base station;
when the event occurs, transmitting event occurrence information for the event to the first base station;
transmitting an access request for a second base station included in the disaster communication network to the first base station; and
accessing the second base station
That comprising a, handover performing method.
15. The method of claim 14,
determining whether a first event has occurred based on the handover condition and the signal strength of the first base station;
transmitting event occurrence information for the determined first event to the first base station; and
Receiving a message including a handover condition including a radio access network (RAN) shared operation parameter from the first base station, the user terminal.
16. The method of claim 15,
Further comprising the step of transmitting a handover request to the second base station to the first base station,
Based on the handover request, communication for RAN sharing between the first base station and the second base station is performed, the user terminal.
17. The method of claim 16,
Further comprising the step of receiving a message including information on the target cell of the second base station from the first base station based on the communication,
The step of accessing the second base station,
The user terminal comprising the step of accessing the second base station based on the RAN shared operation parameter and information on the target cell of the second base station.
18. The method of claim 17,
after being connected to the second base station, determining whether a second event has occurred based on the handover condition and the signal strength of the first base station; and
The user terminal further comprising the step of transmitting event occurrence information for the determined second event to the first base station.
19. The method of claim 18,
The user terminal further comprising the step of receiving a message including a RAN sharing release parameter from the first base station.

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