KR20190116802A - System and method for establishing and managing terminals for fast handover in mobile wireless backhaul system - Google Patents

Abstract

Disclosed is a method for setting and controlling a terminal for rapid handover in a mobile wireless backhaul system. The method for handover in a mobile wireless backhaul system comprises the steps of: allowing a source base station to transmit information on a mobile wireless backhaul device to a target base station disposed in a progress direction of a transfer means, wherein the source base station uses mobile wireless backhaul device installed on the transfer means to provide data communication service to a user disposed in the transfer means; allowing the target base station to set resources to be assigned to the mobile wireless backhaul device which is to move to the inside of coverage of the target base station as the transfer means progresses; allowing the source base station to transmit information of the target base station and parameters related to the resources set by the target base station to the mobile wireless backhaul device; allowing the source base station to transmit information for forwarding data to the mobile wireless backhaul device to the target base station when the mobile wireless backhaul device meets a condition for handover set by the source base station; allowing the target base station to perform synchronization with the mobile wireless backhaul device by the parameters related to setting of the resources to conduct procedures of handover; and allowing the target base station to transfer a data path for data communication service from the source base station to the target base station to provide the data communication service to the mobile wireless backhaul device.

Description

Terminal setup and management method for fast handover in mobile wireless backhaul system {SYSTEM AND METHOD FOR ESTABLISHING AND MANAGING TERMINALS FOR FAST HANDOVER IN MOBILE WIRELESS BACKHAUL SYSTEM}

The present invention relates to a mobile wireless backhaul system and method for setting and managing a terminal when a mobile base station is replaced in a mobile communication system.

5G mobile internet technology supports 1 Gbps data communication service per person anytime and anywhere, and its goal is to enable Gbps data communication service without interruption even at the speed of up to 600 Km / hr.

Conventional mobile communication systems up to the fourth generation use cellular frequencies below 6 GHz and are optimized for low-speed mobile environments (Nomadic). In other words, the requirements of 4G mobile communication are optimized for low speed (3km / h) environment, provide good quality up to medium speed (~ 120km / h), and communication connection is not broken at high speed (~ 350 km / h). Limited to service. These 4G mobile communication requirements were set forth by ITU-R and 3GPP before the 2007 Apple smartphone was released.

On the other hand, after the popularization of smartphones, the importance of mobile data communication services is increasing in group mobiles such as subway / high speed trains.

In a mobile vehicle, general users may directly receive a service through a mobile communication network outside the vehicle, and may receive a service in the form of a WLAN or an in-vehicle mobile small cell coupled to a mobile wireless backhaul. Various wireless access technologies are being considered for the Giga-class service required by 5G Internet technology, and the necessity of a mobile wireless backhaul device is increasing to provide a Giga-class service in a high-speed group mobile.

In a conventional LTE system, a handover procedure is performed from a source base station to a target base station using an A3 event in an area where handover is to be performed. In addition, the conventional LTE system performs a handover procedure using the X2 between the base stations, or a handover procedure using the S1 between the base station and the MME.

However, unlike LTE, the mobile backhaul system rapidly decreases the radio wave strength during handover. Therefore, when using the conventional LTE handover procedure, a handover failure may occur and the data communication service may be disconnected.

Accordingly, there is a demand for a method of providing a data communication service without disconnection of service due to handover in a mobile backhaul system.

The present invention can provide a system and method for providing a data communication service without disconnection of service due to handover between a mobile wireless backhaul device 100 and base stations that move at high speed.

In a handover method of a mobile wireless backhaul system according to an embodiment of the present invention, a source base station for providing a data communication service to a user located in the mobile means using a mobile wireless backhaul device installed in a mobile means is provided by the mobile wireless backhaul. Transmitting information associated with the device to a target base station located in the direction of travel of the means of movement; Setting, by the target base station, a resource to be allocated to a mobile wireless backhaul device to move into coverage of a target base station as the mobile means progresses; Transmitting, by the source base station, the target base station information and parameters related to resources set by the target base station to the mobile wireless backhaul device; When the mobile wireless backhaul device satisfies the handover condition set by the source base station, transmitting, by the source base station, information for forwarding data to the mobile wireless backhaul device to the target base station; Performing, by the target base station, a handover procedure by synchronizing with the mobile wireless backhaul device with a parameter related to setting of the resource; And moving, by the target base station, a data path for a data communication service from the source base station to the target base station to provide a data communication service to the mobile wireless backhaul device.

According to an embodiment of the present invention, the mobile wireless backhaul device transmits the information of the mobile wireless backhaul device 100 to the target base station to move in advance, and transmits the information of the target base station to the mobile wireless backhaul device 100 in advance, It is possible to provide a data communication service without disconnection of service due to handover between the mobile wireless backhaul device and the base stations moving to.

1 is a diagram illustrating a mobile wireless backhaul system according to an embodiment of the present invention.
2 is a diagram illustrating propagation characteristics of an LTE system and a mobile wireless backhaul system.
3 is a diagram illustrating a handover method of a mobile wireless backhaul system according to an embodiment of the present invention.
4 is a diagram illustrating a data forwarding related information transmission process of a handover method of a mobile wireless backhaul system according to an embodiment of the present invention.
5 is a diagram illustrating a handover process of a handover method of a mobile wireless backhaul system according to an embodiment of the present invention.

Hereinafter, exemplary embodiments will be described in detail with reference to the accompanying drawings. However, various changes may be made to the embodiments so that the scope of the patent application is not limited or limited by these embodiments. It is to be understood that all changes, equivalents, and substitutes for the embodiments are included in the scope of rights.

The terminology used herein is for the purpose of description and should not be construed as limiting. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described on the specification, one or more other features. It is to be understood that the present disclosure does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

In addition, in the description with reference to the accompanying drawings, the same components regardless of reference numerals will be given the same reference numerals and duplicate description thereof will be omitted. In the following description of the embodiment, when it is determined that the detailed description of the related known technology may unnecessarily obscure the gist of the embodiment, the detailed description thereof will be omitted.

The handover method according to an embodiment of the present invention may be performed by a mobile wireless backhaul system.

1 is a diagram illustrating a mobile wireless backhaul system according to an embodiment of the present invention.

The Mobile Hotspot Network (MHN) system includes a mobile wireless backhaul (MTE) terminal 100 (MTE), a source base station (MDU) 110, a target base station 120, and a gateway (mGW). MHN Gateway) 130 may be configured.

The source base station 110 may provide a data communication service to the mobile wireless backhaul device 100 that passes through the coverage that includes the location 102 using the wireless unit 111.

The target base station 120 may provide a data communication service to the mobile wireless backhaul device 100 that passes through the coverage including the location 103 using the wireless unit 121. In addition, the target base station 120 may use the wireless unit 122 to provide a data communication service to the mobile wireless backhaul device 100 passing through coverage including a location different from the location 103.

That is, one or more wireless units used by the base station included in the mobile wireless backhaul system to provide data communication service to the mobile wireless backhaul device 100 may be provided. Coverage that can provide data communication services may also increase.

In addition, the source base station 110 and the target base station 120 may perform the same operation and are included in the mobile wireless backhaul system, and the source base station connected to the mobile wireless backhaul device 100 before the handover is performed. A base station to which the mobile wireless backhaul device 100 is to be connected by handover may be defined as a target base station 120.

The gateway 130 may be connected to an external network of the mobile wireless backhaul system, and may interoperate with the external network a data communication service provided by the source base station 110 or the target base station 120 to the mobile wireless backhaul device 100. .

The mobile wireless backhaul device 100 is installed in a moving means 101 such as a train, as shown in FIG. 1, and transmits a signal received from the MHN radio units (mRUs) 111, 121, and 122 to the inside of the moving means 101. Can be sent to a user located at.

The mobile wireless backhaul device 100 communicates wirelessly to the location 103 at the source base station 110 providing wireless communication to the location 102 as the means of movement 101 moves from location 102 to location 103. It may be handed over to the target base station 120 providing a.

When the mobile wireless backhaul device 100 is initialized and installed in the mobile means 101, the management server (not shown) of the mobile wireless backhaul system may register the mobile wireless backhaul device 100 to the core network of the mobile wireless backhaul system. have. The management server may set resources for transmitting data to the mobile base station 110, the target base station 120, and the mobile base backhaul device 100 in the core network and the remaining base stations included in the mobile base station. In addition, the management server may perform a setting procedure for transmitting and receiving data, such as IP allocation, to the mobile wireless backhaul device 100.

In this case, the management server may set resources related to the mobile wireless backhaul device 100 in consideration of a data communication service and a quality of service (QoS).

Basically, the management server may set a default data transmission resource while registering the mobile wireless backhaul device 100 in the core network. When the newly registered radio access device transmits a 3GPP-based control message or the QoS is different from the default data transmission resource, the management server may set a dedicated resource optimized for the mobile radio backhaul device 100. In addition, if the QoS requirement is the same as the default data transmission resource, the management server may not set the channel.

After the setting by the management server is completed, the mobile wireless backhaul device 100 may be connected to the source base station 110 to perform a data communication service between the user and the source base station 110.

When the mobile wireless backhaul device 100 is connected to the source base station 110, the management server may perform a setup procedure for handover.

In this case, the management server may set a measurement parameter of the mobile wireless backhaul device 100. The management server may set basic information about the target base station 120 corresponding to the moving path of the moving means 101 in which the mobile wireless backhaul device 100 is installed among the base stations included in the mobile wireless backhaul system. For example, when the moving means 101 is a means in which the traveling direction is fixed, such as a railway, the target base station 120 may be a base station located in the traveling direction of the moving means 101.

In this case, the source base station 110 may transmit the information of the target base station 120, which is the base station to which the mobile wireless backhaul device 100 may be connected during the movement, to the mobile wireless backhaul device 100 through an RRC message. In addition, the source base station 110 may transmit information related to the mobile wireless backhaul device 100 to the target base station 120 located in the moving direction of the moving means 101.

At this time, the target base station 120 may set resources to be allocated to the mobile wireless backhaul device 100 to enter into the coverage of the target base station 120 as the mobile unit 101 proceeds. Next, the target base station 120 may transmit a parameter related to setting of resources to the mobile wireless backhaul device 100 through the source base station 110.

When the mobile wireless backhaul device 100 satisfies the handover condition set by the source base station 110, the target base station 120 receives information for forwarding data to the mobile wireless backhaul device 100 by the target base station 110. Can be sent. At this time, when the moving means 101 moves out of the coverage where the source base station 110 can perform the data communication service using the wireless unit 121, the handover condition set by the source base station 110 is Can be satisfied.

The target base station 120 receiving the information for forwarding the data may perform a handover procedure by synchronizing with the mobile wireless backhaul device as a parameter related to resource setting.

Next, the target base station 120 may move the data path for the data communication service from the source base station 110 to the target base station 120 to provide the data communication service to the mobile wireless backhaul device 100.

The mobile wireless backhaul system according to the present invention transmits the information of the terminal to the target base station 120 to which the mobile wireless backhaul device 100 will move in advance, and transmits the information of the target base station 120 to the mobile wireless backhaul device 100 in advance. As a result, it is possible to provide a data communication service without disconnection of service due to handover between the mobile wireless backhaul device 100 and the base stations that move at high speed.

2 is a diagram illustrating propagation characteristics of an LTE system and a mobile wireless backhaul system.

The LTE system has a coverage of each base station in a circle or polygon with a similar distance to the base station and the boundary. Therefore, when the terminal moves to the coverage of another adjacent base station, as shown in the graph 210 of FIG. 2, the link quality 211 of the cell coverage Cell1 of the source base station currently connected to the terminal is Sequentially decreases, the connection quality 212 of the cell coverage (Cell2) of the target base station located in the direction in which the terminal moves sequentially increases, and the connection quality 211 of the cell coverage (Cell1) and the cell coverage (Cell2) Handover may occur when the difference 213 between the connection quality 212 is a handover margin.

However, in a mobile backhaul system for a high speed moving body following a predetermined line, cell planning should be performed based on the cell coverage optimized for the line. Therefore, the radio wave output by the radio unit corresponding to the base station has a very narrow beam width of directivity and a relatively long and thin cell shape can be formed similarly to the shape of the line.

Therefore, when the fast mobile object in which the mobile wireless backhaul device 100 is located moves from the cell coverage Cell1 of the source base station to the cell coverage Cell2 of the target base station, as shown in the graph 220 of FIG. The propagation intensity 221 of the source base station can be drastically reduced when the cell passes through the cell coverage Cell1 of the source base station. In addition, the fast moving object passes through the cell coverage Cell2 of the target base station, and the radio wave strength 222 of the target base station may also decrease rapidly.

In other words, the LTE system has a gradual change in connection quality, so there is time for handover, whereas in the mobile backhaul system, when the handover is performed in the same manner as in the LTE system, when the handover is abruptly reduced in strength due to position movement, the handover is performed. May fail.

Specifically, according to the handover method of the LTE system, the receiving base station receiving the measurement report message to the mobile wireless backhaul device 100 determines that the handover is necessary, and changes the RRC connection structure to perform the handover (Connection At the time of transmitting the reconfiguration message to the mobile wireless backhaul device 100, the radio wave strength of the source base station is reduced to such an extent that the mobile wireless backhaul device 100 cannot receive it, so that the mobile wireless backhaul device 100 changes the RRC connection structure. The situation may not be received.

Therefore, the mobile wireless backhaul system according to the present invention transmits the information of the mobile wireless backhaul device 100 to the target base station 120 to which the mobile wireless backhaul device 100 will move in advance, and the target base station to the mobile wireless backhaul device 100. By transmitting the information of 120 in advance, even if the mobile wireless backhaul device 100 does not receive the RRC connection structure change message transmitted by the source base station 110, the mobile wireless backhaul device 100 and the base stations that move at high speed. It is possible to provide a data communication service without disconnection of service due to handover.

3 is a diagram illustrating a handover method of a mobile wireless backhaul system according to an embodiment of the present invention.

The handover method of the mobile wireless backhaul system illustrated in FIGS. 3 to 5 is described on the assumption that there are interfaces between base stations, but when there is no interface between base stations, the handover method of the mobile wireless backhaul system through a network is illustrated. This may be done.

In step 310, the source base station 110 delivers the information related to the mobile wireless backhaul device 100 to the target base station 120. In this case, the target base station 120 may be a base station on a mobile path of the mobile wireless backhaul device 100 or a base station configured to perform cell measurement on the mobile wireless backhaul device 100. For example, the information related to the mobile wireless backhaul device 100 may include at least one of a quality of service (QoS) bearer number allocated to the source base station 110 and information of a terminal belonging to the mobile wireless backhaul device 100. It can be a context. In addition, the information of the terminal may be information required for group handover when the terminal uses LTE.

In step 320, the target base station 120 prepares to set resources for the mobile wireless backhaul device 100 to be transferred to the handover, and requires parameters (C-RNTI, preamble) required for setting the mobile wireless backhaul device 100. Can be assigned. In this case, the target base station 120 may allocate a dedicated preamble, a terminal id, and the like for the mobile wireless backhaul device 100 to perform random access to the target base station 120. In addition, the target base station 120 may allocate resources so that the mobile wireless backhaul device 100 may receive the same service as the source base station 110. The target base station 120 may modify the bearer setting with the network to allocate resources so that the mobile wireless backhaul device 100 may receive the same service as the source base station 110.

In operation 330, the target base station 120 may transmit the parameters required for setting the mobile wireless backhaul device 100 to the source base station 110.

In step 335, the source base station 110 may include the parameters necessary for setting up the mobile wireless backhaul device 100 received in step 330 in the RRC connection structure change message and transmit them to the mobile wireless backhaul device 100.

In addition, the source base station 110 may transmit a parameter for measuring the surrounding cells and base station information to the mobile wireless backhaul device 100. At this time, the surrounding base station information is information of the base stations corresponding to the path of the moving means 101, and may include the target base station 120 information.

In addition, the source base station 110 may receive a list of base stations included in the mobile wireless backhaul system from a network or a management server to determine neighbor base station information. For example, when the moving means 10 is a high speed train, the source base station 110 may transmit the base station list of the track according to the train schedule to the mobile wireless backhaul device 100 as base station information of the surroundings.

In addition, the source base station 110 determines a parameter for cell measurement around the mobile wireless backhaul device 100 based on the base station list received from the network or the management server and the cell measurement parameter and transmits it to the mobile wireless backhaul device 100. Can be.

The source base station 110 may transmit the target base station information to the mobile wireless backhaul device 100 before step 310 is performed separately from step 335.

In operation 340, the source base station 110 may transmit / receive data with the gateway 130. In addition, the source base station 110 transmits and receives the data transmitted and received at step 340 with the mobile wireless backhaul device 100, thereby providing a data communication service to a terminal connected to the wireless backhaul device 100 and the wireless backhaul device 100. can do.

If the mobile wireless backhaul device 100 satisfies the handover condition set by the source base station 110, the source base station 110 may perform step 350.

In operation 350, the source base station 110 may transmit information for forwarding data to the mobile wireless backhaul device 100 to the target base station 120.

In operation 360, the target base station 120 may perform a handover procedure by synchronizing with the mobile wireless backhaul device 100 using a parameter related to resource setting.

In this case, the mobile wireless backhaul device 100 may synchronize with the target base station 120 and perform a handover procedure using parameters required for setting the mobile wireless backhaul device 100 received in step 335. In addition, the mobile wireless backhaul device 100 may complete a handover procedure by transmitting an RRC connection reconfiguration complete message to the target base station 120.

In operation 365, the target base station 120 may move the data path for the data communication service from the source base station 110 to the target base station 120.

In operation 370, the target base station 120 may transmit / receive data with the gateway 130. In addition, the target base station 120 transmits and receives data transmitted and received at step 370 with the mobile wireless backhaul device 100, thereby providing a data communication service to a terminal connected to the wireless backhaul device 100 and the wireless backhaul device 100. can do.

4 is a diagram illustrating a data forwarding related information transmission process of a handover method of a mobile wireless backhaul system according to an embodiment of the present invention. Steps 410 to 470 of FIG. 4 may be included in step 350 of FIG. 3.

In operation 410, the source base station 110 may allocate resources for uplink transmission to the mobile wireless backhaul device 100.

In step 420, the mobile wireless backhaul device 100 may determine whether the handover condition set by the source base station to the mobile wireless backhaul device 100 is satisfied. If the handover condition is not satisfied, the mobile wireless backhaul device 100 may repeat step 420 until the handover condition is satisfied. In addition, when the handover condition is satisfied, the mobile wireless backhaul device 100 may perform step 430.

In operation 430, the mobile wireless backhaul device 100 may transmit a measurement report message to the source base station 110 using the resources allocated in operation 410. In addition, the mobile wireless backhaul device 100 may prepare a handover by setting a parameter for setting the mobile wireless backhaul device 100 received in step 335 to a setting value of the target base station 120.

In operation 440, the source base station 110 may determine a local time point as a handover time point of the mobile wireless backhaul device 100. In addition, the source base station 110 may store a signal-to-noise ratio (SN) value of a Packet Data Convergence Protocol (PDCP) of the mobile wireless backhaul device 100 to be handed over. Next, the source base station 110 may transmit the stored SN value to the target base station 120 as an SN value for data forwarding of the mobile wireless backhaul device 100. In addition, when the mobile wireless backhaul system is a UDP service, the source base station 110 may not transmit the SN value to the target base station 120.

In operation 450, the source base station 110 may receive DL data to be transmitted from the gateway 130 to the mobile wireless backhaul device 100 through a data communication service.

In operation 460, the source base station 110 may forward the DL data received in operation 450 to the target base station 120.

In step 470, the target base station 120 may store the DL data received in step 460 until the mobile wireless backhaul device 100 is handed over.

5 is a diagram illustrating a handover process of a handover method of a mobile wireless backhaul system according to an embodiment of the present invention. Steps 510 to 560 of FIG. 5 may be included in step 365 of FIG. 3. In addition, step 510 may be performed after the handover is completed in step 360.

In operation 510, the target base station 120 may transmit the DL data stored in operation 470 to the mobile wireless backhaul device 100. In this case, the target base station 120 may sequentially transmit the DL data stored in step 470 to the mobile wireless backhaul device 100 until step 515.

In operation 520, the target BS 120 may transmit a PATH SWITCH REQUEST message to the gateway 130. In this case, the path change request message is a message for converting the data path between the gateway 130 and the source base station 110 into a data path between the gateway 130 and the target base station 120.

In operation 530, the gateway 130 may transmit a path change notification message indicating that the data path is completed to the source base station 110. For example, the route change notification message may be an end marker.

In step 535, the source base station 110 may transmit the path change notification message received in step 530 to the target base station 120.

In step 540, the gateway 130 sets the data path between the gateway 130 and the source base station 110 according to the path change request message received in step 520, between the gateway 130 and the target base station 120. Can be converted to

In operation 550, the target base station 120 may receive DL data to be transmitted from the gateway 130 to the mobile wireless backhaul device 100 through a data communication service. In operation 555, the target base station 120 may forward the DL data received in operation 550 to the mobile wireless backhaul device 100. In this case, steps 550 and 555 are the same as those of steps 370 and 375 of FIG. 3, which provide a data communication service to a terminal connected to the wireless backhaul device 100 and the wireless backhaul device 100. It may be a step.

In operation 560, the gateway 130 may transmit a PATH SWITCH REQUEST ACK message to the target base station 120.

In operation 570, the target base station 120 may request the source base station 110 to delete information related to the mobile wireless backhaul device 100. For example, when the information related to the mobile wireless backhaul device 100 set in the source base station 110 is a context, the target base station 120 may transmit a UE context release message to the source base station 110.

In operation 580, the source base station 110 may delete information related to the mobile wireless backhaul device 100 according to the request received in operation 570.

Since the target base station 120 has become a source base station to which the mobile wireless backhaul device 100 is connected, the target base station 120 sets itself as a source base station, and the mobile base station 120 to hand over to the next target base station 120. 3 to 5 may be performed by setting a base station as a target base station.

According to the present invention, the mobile wireless backhaul device 100 transmits information of the terminal to the target base station 120 to move in advance, and transmits the information of the target base station 120 to the mobile wireless backhaul device 100 in advance, thereby moving at high speed. A data communication service may be provided without service interruption due to handover between the mobile wireless backhaul device 100 and the base stations.

The method according to the embodiment may be embodied in the form of program instructions that can be executed by various computer means and recorded in a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. The program instructions recorded on the media may be those specially designed and constructed for the purposes of the embodiments, 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 not only machine code generated by a compiler, but also 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 embodiments, and vice versa.

The software may include a computer program, code, instructions, or a combination of one or more of the above, and configure the processing device to operate as desired, or process independently or collectively. You can command the device. Software and / or data may be any type of machine, component, physical device, virtual equipment, computer storage medium or device in order to be interpreted by or to provide instructions or data to the processing device. Or may be permanently or temporarily embodied in a signal wave to be transmitted. The software may be distributed over networked computer systems so that they may be stored or executed in a distributed manner. Software and data may be stored on one or more computer readable recording media.

Although the embodiments have been described with reference to the accompanying drawings, those skilled in the art may apply various technical modifications and variations based on the above. For example, the described techniques may be performed in a different order than the described method, and / or components of the described systems, structures, devices, circuits, etc. may be combined or combined in a different form than the described method, or other components. Or even if replaced or substituted by equivalents, an appropriate result can be achieved.

Therefore, other implementations, other embodiments, and equivalents to the claims are within the scope of the following claims.

100: mobile wireless backhaul device
110: source base station
120: target base station
130: gateway

Claims (1)

A source base station that provides a data communication service to a user located in the mobile means by using a mobile wireless backhaul device installed in the mobile means transmits information related to the mobile wireless backhaul device to a target base station located in the traveling direction of the mobile means. Doing;
Setting, by the target base station, a resource to be allocated to a mobile wireless backhaul device to move into coverage of a target base station as the mobile means progresses;
Transmitting, by the source base station, the target base station information and parameters related to resources set by the target base station to the mobile wireless backhaul device;
When the mobile wireless backhaul device satisfies the handover condition set by the source base station, transmitting, by the source base station, information for forwarding data to the mobile wireless backhaul device to the target base station;
Performing, by the target base station, a handover procedure by synchronizing with the mobile wireless backhaul device with a parameter related to setting of the resource; And
Providing, by the target base station, a data path for a data communication service from the source base station to the target base station to provide a data communication service to the mobile wireless backhaul device;
Handover method of a mobile wireless backhaul system comprising a.

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