KR102052966B1 - Backhaul system and control method thereof - Google Patents

Abstract

The present invention, while implementing a backhaul between the base station and the core network in a wireless manner by using a base station device of the mobile communication, the control of the backhaul system and backhaul system that can prevent the problems expected by implementing the backhaul in a wireless manner A method, a method of operating a backhaul agent and a backhaul agent, and a method of operating a backhaul terminal device and a backhaul terminal device are proposed.

Description

BACKHAUL SYSTEM AND CONTROL METHOD THEREOF}

The present invention relates to a backhaul system, and more particularly, to a method for controlling a backhaul system and a backhaul system to wirelessly implement a backhaul between a base station and a core network, a method of operating a backhaul agent and a backhaul agent, and a backhaul terminal. It relates to a method of operation of the device and the backhaul terminal device.

Although backhaul, which is a connection between a base station and a terminal for a mobile communication service, is wirelessly connected in a standard, it is not necessarily required to use wired or wireless in a standard, and this is an implementation issue that can be selected by an operator implementing a mobile communication network. .

However, in most cases, the backhaul of the base station is implemented in a wired manner that enables stable communication packet transmission, and is implemented in a mmWave-based wireless system only in some regions.

Conventional mmWave-based wireless backhaul implemented in a wireless manner uses a relatively high frequency compared to a mobile communication network such as Long Term Evolution (LTE). The effective transmission distance is several hundred m ~ 2km due to the limitation that can be used only in the line of sight (LOS) environment where there is no obstacle between the base station and the receiver (e.g. core network equipment) and the attenuation of the radio wave according to the distance. There are disadvantages such as limit of accuracy and severe performance deterioration due to precipitation attenuation in rainy weather.

Therefore, at present, in some regions where it is difficult to implement a backhaul in a wired manner, for example, in remote areas or island regions, mmWave-based wireless backhaul is implemented (used) despite the aforementioned disadvantages.

Accordingly, the present invention is to propose a method for implementing a backhaul between the base station and the core network in a wireless manner while improving all the disadvantages of the aforementioned mmWave-based wireless backhaul.

The present invention has been made in view of the above circumstances, and an object of the present invention is to wirelessly implement a backhaul between a base station and a core network.

A backhaul system according to a first aspect of the present invention for achieving the above object, receiving the first communication packet from at least one device for inserting the first path information in the communication packet to generate the first communication packet, A backhaul terminal which inserts identification path information for identifying a device that has generated a first communication packet into the first communication packet and transmits it to the base station apparatus; And receiving the second communication packet from the base station apparatus for generating a second communication packet by inserting second path information into the first communication packet received from the backhaul terminal, and receiving the second path from the second communication packet. And a backhaul agent that deletes the information and the path information for identification and provides the first communication packet to the core network so that only the first path information is deleted from the first communication packet.

Preferably, the identification path information may include address information of the device or a unique identifier assigned to the device by the backhaul terminal.

Preferably, the backhaul agent may classify a communication packet transmission path of the device based on the device address information or the unique identifier in the identification path information.

A backhaul agent according to a second aspect of the present invention for achieving the above object is, the base station device receiving a first communication packet generated by inserting the first path information in the communication packet, the second communication packet to the first communication packet; A packet receiver configured to receive a second communication packet generated by inserting path information; And a core function unit for deleting the second path information from the second communication packet and providing the second path information to a core network so that only the first path information needs to be deleted from the core network.

Preferably, before the second path information is inserted into the first communication packet, identification path information for identifying the device that generated the first communication packet may be inserted into the second communication packet. Can be.

Preferably, the identification path information may include address information of the device or a unique identifier assigned to the device.

Preferably, when the second path information is deleted from the second communication packet by the core function unit, the gateway function unit further provides the first communication packet to the core network by deleting the identification path information. can do.

Preferably, the core function unit may classify a communication packet transmission path of the device based on address information of the device or the unique identifier in the identification path information.

A backhaul terminal device according to a third aspect of the present invention for achieving the above object is a packet for receiving the first communication packet from at least one device for generating a first communication packet by inserting the first path information in the communication packet; Receiving unit; A gateway function unit inserting identification path information for identifying a device that has generated the first communication packet into the first communication packet; And a modem unit transmitting the first communication packet into which the identification path information is inserted, to the base station apparatus.

Preferably, the identification path information may include address information of the device or a unique identifier assigned to the device in the backhaul terminal, which is used to distinguish the communication packet transmission path of the device.

In a method of controlling a backhaul system according to a fourth aspect of the present invention for achieving the above object, a backhaul terminal receives a first communication packet generated by inserting first path information into a communication packet from at least one device. ; The backhaul terminal inserting identification path information for identifying a device that has generated the first communication packet into the first communication packet and transmitting the same to the base station apparatus; Generating, by the base station apparatus, a second communication packet by inserting second path information into the first communication packet received from the backhaul terminal; When the backhaul agent receives the second communication packet from the base station apparatus, the backhaul agent deletes the second path information and the identification path information from the second communication packet and provides the first communication packet to the core network. The core network includes the step of deleting only the first path information from the first communication packet.

In accordance with a fifth aspect of the present invention, there is provided a method of operating a backhaul agent device, the method comprising: receiving a first communication packet generated by inserting first path information into a communication packet; A packet receiving step of receiving a second communication packet generated by inserting second path information into the second communication packet; And transmitting the packet to the core network after deleting the second path information from the second communication packet so that only the first path information is deleted from the core network.

Preferably, before the second path information is inserted into the first communication packet, identification path information for identifying the device that generated the first communication packet may be inserted into the second communication packet. Can be.

Preferably, the packet transmission step may provide the first communication packet to the core network by deleting the second path information and the identification path information from the second communication packet.

Preferably, the identification route information includes address information of the device or a unique identifier assigned to the device, and based on the address information of the device or the unique identifier in the identification route information, The method may further include identifying a communication packet transmission path.

According to a sixth aspect of the present invention, there is provided a method of operating a backhaul terminal device, the method comprising: inserting the first path information into a communication packet to generate the first communication packet from at least one device; Receiving packet receiving step; A path information insertion step of inserting identification path information for identifying a device that has generated the first communication packet into the first communication packet; And a packet transmission step of transmitting the first communication packet into which the identification path information is inserted, to the base station apparatus.

Preferably, the identification path information may include address information of the device or a unique identifier assigned to the device in the backhaul terminal, which is used to distinguish the communication packet transmission path of the device.

Therefore, according to the control method of the backhaul system and the backhaul system according to the present invention, while implementing the backhaul between the base station and the core network in a wireless manner by using the base station apparatus of the mobile communication, the problem expected by implementing the backhaul in a wireless manner Deduce effects that can be prevented beforehand.

1 is a block diagram showing a backhaul system according to a preferred embodiment of the present invention.
2 is a block diagram showing a specific configuration of a backhaul agent and a backhaul terminal according to a preferred embodiment of the present invention.
3 is an exemplary view showing a structure of a backhaul system implemented by a backhaul agent and a backhaul terminal according to a preferred embodiment of the present invention as an example.
4 and 5 are flowcharts illustrating a control method of a backhaul system according to an exemplary embodiment of the present invention on an uplink / downlink basis.
6 is a flowchart illustrating a method of operating a backhaul agent (device) according to a preferred embodiment of the present invention.
7 is a flowchart illustrating a method of operating a backhaul terminal (device) according to a preferred embodiment of the present invention.

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

1 is a diagram illustrating a backhaul system according to a preferred embodiment of the present invention.

As shown in FIG. 1, the backhaul system according to the present invention is a system for wirelessly implementing a backhaul between a base station and a core network.

That is, the backhaul system of the present invention intends to implement a backhaul between a base station and a core network in a wireless manner while all of the disadvantages of the existing mmWave-based wireless backhaul, and for this purpose, a base station apparatus based on a mobile communication using a relatively low frequency ( By using 400, we will implement a wireless backhaul between the base station and the core network, which can be free from line of sight (LOS) constraints, short effective transmission distance limits, and severe performance degradation in rainy weather.

However, if the backhaul between the base station and the core network is implemented in a wireless manner using the base station apparatus 40 of the general mobile communication rather than the mmWave-based wireless backhaul that uses an independent transmission method for transmitting and receiving periods, the communication between the terminal and the base station must correspond. Since the core network equipment must exist, the uplink is encapsulated several times (at least twice) before the backhaul signal of the base station goes up to the core network. encapsulation / De-encapsulation) must be repeated several times (at least twice), and in the case of downlink, the encapsulation is repeated several times in the core network before the backhaul signal of the base station descends from the core network. Should be.

As such, if the encapsulation / de-encapsulation is repeated several times in the core network stage, the equipment in the core network (eg, SGW (24) is repeated in the process of repeating the encapsulation / de-encapsulation several times. , PGW (26)) several round trips, resulting in additional latency of long-distance transmission, and increases the processing capacity of equipment (eg SGW (24), PGW (26)) in the core network This is expected.

Therefore, the backhaul system of the present invention, by adopting the backhaul agent 100, by utilizing the base station device 40, while implementing a backhaul between the base station and the core network in a wireless manner, encapsulation / de-in of the core network stage We want to prevent the encapsulation iteration problem.

Thus, the backhaul system according to the first embodiment of the present invention will be described.

First, at least one device 50 to transmit a backhaul signal, that is, a communication packet through the backhaul system of the present invention, may be an LTE base station (eg, an LTE macro base station, an LTE small base station), and a 3G base station (2). ), Or may be a general communication device other than a base station, such as a WiFi AP (3).

Here, since the present invention is to implement a backhaul between the base station and the core network in a wireless manner, it will be described with reference to the LTE base station 1 and the 3G base station 2 as a device connected to the backhaul terminal 200. .

In the following description, for convenience of description, the communication packet transmission path of the uplink / downlink will be described with reference to the communication packet transmission path of the uplink.

When the LTE base station 1 and the 3G base station 2 receive an uplink signal from a terminal wirelessly connected thereto, the LTE base station 1 and the 3G base station 2 perform tunneling on a communication packet according to the uplink signal.

Hereinafter, for the convenience of description, the LTE base station 1 will be described with reference to the LTE base station 1 and the 3G base station 2.

That is, the LTE base station 1 is a network packet in the LTE core network 20 connected to a communication packet according to an uplink signal of a terminal in order to provide a communication service related to the terminal, for example, an SGW 24. The first communication packet is generated through tunneling to insert (encapsulate) the first path information for sending the communication packet.

When the base station apparatus 40 receives the first communication packet generated by the LTE base station 1, that is, the backhaul signal (uplink) of the LTE base station 1, the base station apparatus 40 inserts the second path information into the first communication packet to insert the second path information. Create a communication packet.

The base station apparatus 40 may be an LTE macro base station or an LTE small base station as an LTE base station. Hereinafter, for convenience of description, the base station apparatus 40 will be referred to as an LTE macro base station, that is, an LTE eNB.

That is, when the LTE eNB 40 receives the first communication packet generated by the LTE base station 1, that is, the backhaul signal (uplink) of the LTE base station 1, the LTE eNB 40 receives the backhaul agent of the present invention in the received first communication packet. A second communication packet is generated through tunneling for inserting (encapsulating) second path information to be sent to 100.

The LTE eNB 40 provides the second communication packet generated as described above to the backhaul agent 100 of the present invention according to the second path information.

As shown in FIG. 1, the core network 10 includes an LTE core network 20, an RNC 32, an SGSN 34, and a GGSN including an MME 22, an SGW 24, a PGW 26, and the like. 3G core network 30 composed of 36 and the like.

Accordingly, the backhaul agent 100 of the present invention may be linked with the core network through a communication method (eg, IP communication, E1 line) supported by each of the LTE core network 20 and the 3G core network 30. It is desirable to have an interface conversion function.

The backhaul agent 100, as described above, the second communication packet generated by inserting (encapsulating) second path information into the backhaul signal of the LTE base station 1 from the LTE base station 1, that is, the first communication packet. Upon reception, the second path information is deleted from the second communication packet and then provided to the core network 10, that is, the LTE core network 20.

More specifically, the backhaul agent 100 deletes (de-encapsulates) the second path information from the second communication packet received from the LTE eNB 40, namely, the first communication packet obtained accordingly. After providing the backhaul signal of the LTE base station 1 to the LTE core network 20, the LTE core network 20 deletes only the first path information (de-encapsulation) and then a communication packet according to the uplink signal of the terminal. To be exported to the external network (5).

That is, the backhaul system according to the first embodiment of the present invention utilizes the LTE eNB 40 to transmit a backhaul signal (uplink) between the LTE base station 1 and the LTE core network 20, but also the LTE core network ( 20) Do not repeat the de-encapsulation several times in the stage.

Of course, according to the backhaul system according to the first embodiment of the present invention, the downlink communication packet transmission path which is processed inversely to the above-described communication packet transmission path of the uplink is also received at the LTE core network 20 stage. We will avoid repeated encapsulations several times.

As described above, the backhaul system according to the first embodiment of the present invention utilizes the base station apparatus 40 to wirelessly implement the backhaul between the base station and the core network, and in the case of the uplink at the backhaul agent 100 stage, the second path. Repeating the encapsulation / de-encapsulation of the core network stage by deleting information, ie, de-tunneling, and inserting second path information, that is, tunneling, to the base station apparatus 40, that is, the LTE eNB 40 in the case of the downlink. Problems can be prevented beforehand.

On the other hand, if the base station apparatus 40, i.e., to implement the backhaul between the base station and the core network in a wireless manner by using the LTE eNB 40, there is a problem that the transmission path of the communication packet for each device, that is, the base station is difficult to distinguish.

Accordingly, the backhaul system of the present invention further employs a backhaul terminal 200 as shown in FIG. 1 and distinguishes a transmission path of a communication packet for each base station from the backhaul agent 100 and the backhaul terminal 200. By mounting, the problem is prevented.

Hereinafter, a backhaul system according to a second preferred embodiment of the present invention configured by further adopting the backhaul terminal 200 will be described.

At this time, for convenience of description, the communication packet transmission path of the uplink / downlink, will be described with reference to the communication packet transmission path of the uplink.

The backhaul terminal 200 of the present invention transmits a backhaul signal (uplink) from at least one device 50 connected thereto to the base station apparatus 40, that is, the LTE eNB 40, through a wireless method, that is, an LTE radio method. Send.

In this case, as described above, the at least one device 50 may be an LTE base station 1 (eg, an LTE macro base station, an LTE small base station), a 3G base station 2, or a WiFi AP 3. It may be a general communication device other than the base station.

Therefore, the backhaul terminal 200 preferably has an interface conversion function so that the backhaul terminal 200 can be connected to the corresponding device through a communication scheme (eg, IP communication, E1 line) supported by each of the at least one device 50.

In the following, for convenience of description, the device will be described with reference to the LTE base station 1 and the 3G base station 2 as a device connected to the backhaul terminal 200, and will be described with reference to the LTE base station 1 in particular.

That is, the LTE base station 1 is a network packet in the LTE core network 20 connected to a communication packet according to an uplink signal of a terminal in order to provide a communication service related to the terminal, for example, an SGW 24. The first communication packet is generated through tunneling to insert (encapsulate) the first path information for sending the communication packet.

When the backhaul terminal 200 receives the first communication packet, that is, the backhaul signal of the LTE base station 1 from the LTE base station 1, the identification for identifying the device that generated the first communication packet, that is, the LTE base station 1 The route information is inserted into the first communication packet and transmitted to the LTE eNB 40 through the LTE radio system.

Hereinafter, for convenience of description, the first communication packet after the identification path information is inserted (encapsulated) by the backhaul terminal 200 will be referred to as a first communication packet.

In this case, the identification path information included in the backhaul terminal 200 includes the address information (IP) of the corresponding device, that is, the LTE base station 1, or the unique assignment of the backhaul terminal 200 to the corresponding device, that is, the LTE base station 1. Identifiers (eg Flags) are included.

When the LTE eNB 40 receives the uplink signal from the backhaul terminal 200, that is, the first communication packet of the LTE base station 1, the LTE eNB 40 sends the received first communication packet to the backhaul agent 100 of the present invention. The second communication packet is generated through tunneling for inserting (encapsulating) the second path information.

The LTE eNB 40 provides the second communication packet generated as described above to the backhaul agent 100 of the present invention according to the second path information.

When the backhaul agent 100 receives the second communication packet generated by inserting (encapsulating) the second path information from the LTE eNB 40 into the first communication packet 'as described above, the backhaul agent 100 receives the second communication packet from the second communication packet. 2 Delete (de-encapsulate) the route information.

The backhaul agent 100 may delete the second path information from the second communication packet and then delete (de-encapsulate) the identification path information, that is, the backhaul signal of the LTE base station 1. The first path information + communication packet) will be provided to the LTE core network 20.

At this time, if the embodiment includes the address information (IP) of the LTE base station 1 in the path information for identification that the backhaul terminal 200 is inserted (encapsulated) in the first communication packet, the backhaul agent 100 is In the identification path information of the first communication packet obtained by deleting the second path information from the second communication packet, the address information of the corresponding device, that is, the address information (IP) of the LTE base station 1, is determined and based on the LTE The communication packet transmission path of the base station 1 can be distinguished.

On the other hand, if the embodiment includes a unique identifier (eg, a flag) in the identification path information that the backhaul terminal 200 is inserted (encapsulated) in the first communication packet, the backhaul agent 100, the second communication From the route information for identification of the first communication packet obtained by deleting the second route information from the packet, the unique identifier (eg, a flag) of the corresponding device, that is, the LTE base station 1 is identified, and based on this, the LTE base station 1 It is possible to distinguish communication paths of communication packets.

That is, the backhaul system according to the second embodiment of the present invention utilizes the LTE eNB 40 to transmit a backhaul signal (uplink) between the LTE base station 1 and the LTE core network 20, but also the backhaul agent 100 ) And the communication packet transmission path of the LTE base station 1 through the function for distinguishing the communication packet transmission path for each device (base station) mounted on the backhaul terminal 200.

Of course, according to the backhaul system according to the second embodiment of the present invention, the backhaul agent 100 and the backhaul terminal may also be used for the downlink communication packet transmission paths that are processed inversely to the above-described uplink communication packet transmission paths. The downlink communication packet transmission path to the LTE base station 1 can be distinguished through a function for distinguishing a communication packet transmission path for each device (base station) mounted in the 200).

Here, in an embodiment of using a unique identifier (eg, a flag) to distinguish a communication packet transmission path, the backhaul terminal 200 creates a new system for managing and managing a unique unique identifier (eg, a flag) for each of at least one device. Since it is necessary to construct, it is determined that an embodiment using the address information (IP) of the device will be more efficient.

Therefore, hereinafter, the description will be made with reference to the embodiment using the address information (IP) of the device to distinguish the communication packet transmission path.

As described above, the backhaul system according to the second preferred embodiment of the present invention implements the backhaul wirelessly while using the base station apparatus 40, that is, the LTE eNB 40, by wirelessly implementing the backhaul between the base station and the core network. As a result, it is possible to prevent problems such as the encapsulation / de-encapsulation repetition problem of the core network and a problem in which a communication packet transmission path cannot be distinguished for each device (base station).

In this case, as shown in FIG. 1, a general LTE terminal 60 may be connected to the LTE eNB 40 instead of the backhaul terminal 200 to use a mobile communication service.

Therefore, in the backhaul system of the present invention, the backhaul agent 100 is separated from the backhaul terminal 200 and the LTE terminal 60 through the LTE eNB 40, thereby recognizing a general LTE terminal connected to the LTE eNB 40 ( 60, it is preferable to connect to the LTE core network 20 as in the past so as not to perform the tunneling release at the backhaul agent 100 stage.

 Here, the method of separating and recognizing the backhaul terminal 200 through the LTE eNB 40 and the LTE terminal 60 through the LTE eNB 40 from the backhaul agent 100 may be very diverse.

For example, the LTE eNB 40 provides all of its own traffic (backhaul terminal 200, LTE terminal 60) to the backhaul agent 100, and the backhaul agent 100 is unique to the backhaul terminal 200. By analyzing the traffic from the LTE eNB 40 with the value (e.g., IMSI value) already held, the traffic of the LTE terminal 60, not the traffic of the backhaul terminal 200, that is, the above-described process of the present invention. LTE core network 20 can be provided without.

Hereinafter, referring to FIG. 2, the functions and specific configurations of the backhaul agent 100 and the backhaul terminal 200 according to the second exemplary embodiment of the present invention will be described in more detail.

For convenience of description, it will be described with reference to the uplink communication packet transmission path (a) of the uplink communication packet transmission path (a) and the downlink communication packet transmission path (b).

In FIG. 2, the LTE base station 1 and the 3G base station 2 will be described as a device connected to the backhaul terminal 200 for convenience of description.

That is, the LTE base station 1 is a network packet in the LTE core network 20 connected to a communication packet according to an uplink signal of a terminal in order to provide a communication service related to the terminal, for example, an SGW 24. The first communication packet is generated through tunneling for inserting (encapsulating) the first path information to be sent to ().

In addition, the 3G base station 2 is connected to the communication packet according to the uplink signal of the terminal, the network equipment in the 3G core network 30 connected to the call (session) to provide a communication service with respect to the terminal, such as RNC 32 The first communication packet is generated through tunneling for inserting (encapsulating) the first path information to be sent to ().

Thereafter, the LTE base station 1 and the 3G base station 2 use the first communication packet generated through tunneling for inserting the first path information into the communication packet according to the uplink signal of the terminal as a backhaul terminal ( 200).

As shown in FIG. 2, the backhaul terminal 200 according to a preferred embodiment of the present invention includes a packet receiver 210 (hereinafter referred to as a packet transmitter / receiver), a gateway function unit 230 and a modem unit 240. .

The packet transmission / reception unit 210 may include a first communication packet into which first path information is inserted as described above from at least one device 50 connected to the backhaul terminal 200, that is, the LTE base station 1 or the 3G base station 2, In other words, it receives a backhaul signal.

In this case, the LTE base station 1 will provide the backhaul signal to the backhaul terminal 200 through IP communication, and the 3G base station 2 will provide the backhaul signal to the backhaul terminal 200 through the E1 line.

Accordingly, the backhaul terminal 200 of the present invention performs an interface conversion function so that the backhaul terminal 200 can be connected through a communication method (eg, IP communication, E1 line) supported by each of the LTE base station 1 and the 3G base station 2. It is preferable to further include an interface converter 220.

For example, the interface conversion unit 220, based on the virtual IP assigned to the 3G base station 2 connected to the backhaul terminal 200, 3G received by the packet transmission and reception unit 210 via the E1 line in the uplink. Converts the backhaul signal of the base station 20, that is, the first communication packet, to the IP-based first communication packet assigned to the 3G base station 2, and in the downlink, the backhaul signal of the 3G base station 20, that is, the IP-based first communication packet. This may be converted into a first communication packet based on the E1 line and transmitted to the packet transmitter / receiver 210.

The gateway function unit 230 is a function unit that performs a function for distinguishing a transmission path of a communication packet for each device (base station).

The gateway function unit 230 inserts identification path information for identifying the device that generated the first communication packet into the first communication packet.

That is, the gateway function unit 230, if the backhaul signal of the LTE base station 1, that is, the first communication packet is received through the packet transmission and reception unit 210, identification path information for identifying the LTE base station 1 Will be inserted into the first communication packet of the LTE base station 1.

Of course, the gateway function unit 230, if the backhaul signal of the 3G base station 2, that is, the first communication packet is received through the packet transmission and reception unit 210, identification path information for identifying the 3G base station (2). Will be inserted into the first communication packet of the 3G base station 2 converted on the basis of IP in the interface conversion unit 220.

Hereinafter, for convenience of description, it will be assumed that the backhaul signal of the LTE base station 1, that is, the first communication packet is received.

In this case, as shown in Fig. 2, the first communication packet received from the LTE base station 1, that is, the backhaul signal of the LTE base station 1, the communication packet from the terminal is carried in the payload, and the SGW 24 The first path information specifying the IP as the destination address (DIP) and the address information (IP) of the LTE base station 1 as the source address (SIP) may be inserted as a header.

More specifically, the gateway function unit 230 may identify the route information for identifying the LTE base station 1 in the backhaul signal, that is, the first communication packet, of the LTE base station 1 received in the form described above. Tunneling to insert (encapsulate) is performed.

Hereinafter, for convenience of description, the first communication packet after inserting (encapsulating) identification path information in the first communication packet by the gateway function unit 230 will be described as referring to the first communication packet. would.

At this time, the identification route information for identifying the LTE base station 1 includes the address information (IP) of the LTE base station (1).

For example, the identification path information for identifying the LTE base station 1 may correspond to the gateway function unit 230 in the backhaul terminal 200 of the gateway function unit 130 configured in the backhaul agent 100 to be described later. Specify the address information (IP) as the destination address (DIP), the address information (IP) of the backhaul terminal 200 as the source address (SIP), and the address information (IP) of the LTE base station (1) Tunneling ID It is preferably in the form of a header specified by (TEID).

The modem unit 240 transmits, to the base station apparatus 40, the first communication packet 'with the identification route information inserted in the gateway function unit 230 as described above.

In other words, the modem unit 240 processes the first communication packet 'of the LTE base station 1 as an LTE radio signal and transmits it to the base station apparatus 40, that is, the LTE eNB 40, via the LTE radio method.

As described above, the backhaul terminal 200 of the present invention inserts (encapsulates) identification path information into a backhaul signal of the device connected to the LTE base station 1, that is, the first communication packet (encapsulation), and then performs LTE through the LTE wireless scheme. transmit to the eNB 40.

When the base station apparatus 40, that is, the LTE eNB 40, receives an uplink signal from the backhaul terminal 200, that is, the first communication packet of the LTE base station 1, the base station apparatus 40, that is, the LTE eNB 40, transmits a second path to the received first communication packet. Insert to generate a second communication packet.

That is, when the LTE eNB 40 receives an uplink signal from the backhaul terminal 200, that is, the first communication packet 'of the LTE base station 1, the LTE eNB 40 corresponds to the first communication packet of the LTE base station 1. Tunneling for inserting (encapsulating) the second path information for sending to the SGW 124 in the core function 120 of the backhaul agent 100 to be described later, for example, a network device connected to a call (session) in relation to 200). Through the second communication packet is generated.

In this case, in the second communication packet, the first communication packet from the backhaul terminal 200 is carried in the payload, the IP of the SGW 124 is designated as the destination address (DIP), and the address information of the LTE eNB 40 ( Second path information that specifies IP as a source address (SIP) may be inserted as a header.

The LTE eNB 40 provides the second communication packet generated as described above to the backhaul agent 100 of the present invention according to the second path information.

As shown in FIG. 2, the backhaul agent 100 according to a preferred embodiment of the present invention includes a packet receiver 110 (hereinafter, referred to as a packet transmitter / receiver), a core function unit 130, and a gateway function unit 130. do.

In addition, according to the present invention, the backhaul agent 100 may be linked with a corresponding core network through a communication method (eg, IP communication, E1 line) supported by each of the LTE core network 20 and the 3G core network 30. In order to be able to do so, it is preferable to further include an interface conversion unit 140 for performing an interface conversion function.

For example, the interface converting unit 140 is based on the virtual IP assigned to the 3G base station 2 by the interface converting unit 220 which is a corresponding configuration in the backhaul terminal 200 described above. 20 converts the backhaul signal, that is, the IP-based first communication packet, into the E1 line-based first communication packet and transmits the same to the 3G core network 30, and in the downlink, the packet transmitter / receiver 140 through the E1 line. The first communication packet of the received 3G base station 20 may be converted into an IP-based first communication packet.

The packet transmission / reception unit 110 receives the second communication packet of the LTE base station 1 as described above from the base station apparatus 40, that is, the LTE eNB 40.

The core function unit 120 deletes the second path information from the second communication packet of the received LTE base station 1.

As shown in FIG. 2, the core function unit 120 is a device that performs encapsulation / de-encapsulation related functions of route information in the LTE core network 20, that is, an MME 22 or an SGW ( 24) and the devices corresponding to the PGW 26, that is, the MME 122, the SGW 124, and the PGW 126.

In more detail, the core function unit 120, in particular, the SGW 124 sends the received second communication packet of the LTE base station 1 to the core function unit 120, in particular the SGW 124, according to the two-path information. The PGW 126 deletes (de-encapsulates) the second path information from the second communication packet and provides the PGW 126 to the gateway function unit 130 according to the identification path information of the first communication packet.

The gateway function unit 130 is a function unit that performs a function for distinguishing a transmission path of a communication packet for each device (base station).

The gateway function unit 130, if the first communication packet 'is obtained after the second path information is deleted from the second communication packet of the LTE base station 1 by the core function unit 120, the first communication packet' Deletes (de-encapsulates) the path information for identification, and the first communication packet, i.e., the backhaul signal (first path information + communication packet) of the LTE base station 1, is obtained from the LTE core network 20, that is, the first communication packet. Provided to the SGW 24 according to the first path information of the communication packet.

At this time, the core function unit 120, in the tunneling ID (TEID), more specifically the route information (ID) of the first communication packet obtained by deleting the second path information from the second communication packet, the LTE base station ( Checking the address information (IP) of 1) and based on this it is possible to distinguish the communication packet transmission path of the LTE base station (1).

Accordingly, the LTE core network 20 deletes only the first path information from the first communication packet provided from the backhaul agent 100, that is, the backhaul signal (first path information + communication packet) of the LTE base station 1 (de-in). After encapsulation), the communication packet according to the uplink signal of the terminal can be exported to the external network 5.

Therefore, as can be seen in Figure 2, in the backhaul system according to the second embodiment of the present invention, in the uplink communication packet transmission path (a), a device (for example, LTE base station ( The same first communication packet as the backhaul signal (first communication packet) from 1)) may be transmitted from the backhaul agent 100 to the LTE core network 20.

Of course, according to the backhaul system according to the second embodiment of the present invention, it is apparent that the downlink communication packet transmission path (b) will be processed inversely to the aforementioned uplink communication packet transmission path (a). It will be described later in Figure 5.

In conclusion, in the backhaul system according to the second embodiment of the present invention, in the downlink communication packet transmission path (b), the same as the first communication packet received from the LTE core network 20 to the backhaul agent 100. The backhaul signal (first communication packet) may be transmitted to the corresponding device (eg, LTE base station 1) at the backhaul terminal 200.

Meanwhile, in FIG. 1 and FIG. 2, one backhaul agent 100 and a backhaul terminal 200 are adopted to implement the backhaul system of the present invention. However, this is only a simple implementation method for explanation.

In contrast, the backhaul system of the present invention may be implemented by cascading by adopting a plurality of backhaul agents # 1, # 2 ... # N and backhaul terminals # 1, # 2 ... # N. have. Figure 3 shows an example of the backhaul system of the present invention that can be implemented by adopting a plurality of backhaul agents # 1, # 2 ... #N and backhaul terminals # 1, # 2 ... #N .

As such, the backhaul terminals # 1, # 2 ... # N are overlapped and implemented by using a device connected to the backhaul terminal # 1, that is, an LTE base station as a communication packet transmission path for another backhaul terminal # 2. By correspondingly implementing the backhaul agents # 1, # 2 ... #N by the number of overlapping implementations of the backhaul terminals # 1, # 2 ... #N, the backhaul system of the present invention can be implemented.

As described above, the backhaul system according to the preferred embodiment of the present invention implements the backhaul wirelessly while using the base station apparatus 40, that is, the LTE eNB 40, while implementing the backhaul between the base station and the core network in a wireless manner. As a result, it is possible to prevent problems such as the encapsulation / de-encapsulation repetition problem of the core network and a problem in which a communication packet transmission path cannot be distinguished for each device (base station).

Hereinafter, a method of controlling a backhaul system and a method of operating a backhaul agent and a backhaul terminal according to a preferred embodiment (second embodiment of the above) will be described with reference to FIGS. 4 to 7.

Here, for the convenience of description, the configuration shown in FIGS. 1 to 3 described above will be described with reference to the corresponding reference numerals.

First, referring to FIG. 4, a control method of a backhaul system according to an exemplary embodiment of the present invention will be described with reference to a communication packet transmission path (a) of an uplink.

Referring to the LTE base station 1 as a device connected to the backhaul terminal 200, the LTE base station 1, in order to provide a communication service with respect to the terminal to the communication packet according to the uplink signal of the terminal A first communication packet is generated through tunneling for inserting (encapsulating) first path information for sending to a network device in the LTE core network 20 to which a call (session) is connected, for example, to the SGW 24 (S10). ).

Thereafter, the LTE base station 1 provides the generated first communication packet to the backhaul terminal 200 as a backhaul signal (S20).

When the backhaul terminal 200 receives the first communication packet, that is, the backhaul signal of the LTE base station 1 from the LTE base station 1, identification path information for identifying the LTE base station 1 that generated the first communication packet. Generates a first communication packet through tunneling to insert (encapsulate) the first communication packet (S30), and transmits the first communication packet to the LTE eNB 40 through the LTE radio scheme (S40). ).

When the LTE eNB 40 receives the uplink signal from the backhaul terminal 200, that is, the first communication packet of the LTE base station 1, the LTE eNB 40 sends the received first communication packet to the backhaul agent 100 of the present invention. The second communication packet is generated through tunneling for inserting (encapsulating) the second path information (S50).

The LTE eNB 40 provides the second communication packet generated as described above to the backhaul agent 100 of the present invention according to the second path information (S60).

When the backhaul agent 100 receives the second communication packet generated by inserting (encapsulating) the second path information from the LTE eNB 40 into the first communication packet 'as described above, the backhaul agent 100 receives the second communication packet from the second communication packet. 2, the route information is deleted (de-encapsulated) (S70).

In addition, the backhaul agent 100 may obtain the first communication packet by deleting (de-encapsulating) identification path information from the first communication packet obtained by deleting the second path information from the second communication packet. (S73).

At this time, the backhaul agent 100, the address information of the device identified in the identification path information of the first communication packet obtained by deleting the second path information from the second communication packet, that is, the address information of the LTE base station 1 ( Based on IP), it is possible to distinguish the communication packet transmission path of the device, that is, LTE base station 1 (S76).

In addition, the backhaul agent 100 is a core network for the backhaul signal of the first communication packet, that is, the LTE base station 1 obtained by deleting (de-encapsulating) the second path information and the identification path information from the second communication packet. (10) More specifically will be provided to the LTE core network 20 (S80).

Core network 10 More specifically, in the LTE core network 20, the first communication packet provided from the backhaul agent 100, that is, the first path in the backhaul signal (first path information + communication packet) of the LTE base station 1 After deleting only the information (de-encapsulation) (S90) it is possible to export the communication packet according to the uplink signal of the terminal to the external network (5) (S100).

Accordingly, in the uplink communication packet transmission path (a), the device received at the backhaul terminal 200 in step S20, that is, the backhaul signal (first communication packet) from the LTE base station 1, and the backhaul agent in step S80 ( In step 100, the first communication packet of the LTE base station 1 transmitted to the LTE core network 20 becomes identical to each other.

Hereinafter, referring to FIG. 5, the control method of the backhaul system according to an exemplary embodiment of the present invention will be described based on the communication packet transmission path b of the downlink.

In this case, the LTE base station 1 will be described as a device connected to the backhaul terminal 200 to correspond to the description with reference to FIG. 4.

When the communication packet is received from the external network 5 (S110), more specifically in the core network 10, the LTE core network 20 inserts first path information for sending to the LTE base station 1 in the communication packet (encapsulation Through tunneling to generate a first communication packet, a first communication packet is generated (S120).

Here, in more detail, each equipment and backhaul agent 100 of the LTE core network 20, the uplink communication packet transmission path (a) to the LTE base station 1 identified in FIG. Based on this, it is apparent that the backhaul agent 100 is recognized as the LTE base station 1.

Therefore, the LTE core network 20 provides the generated back communication signal, that is, the backhaul signal of the LTE base station 1 to the backhaul agent 100 (S130).

At this time, when the backhaul agent 100 receives the first communication packet, that is, the backhaul signal of the LTE base station 1 from the LTE core network 20, the address information of the corresponding device identified in the first communication packet, that is, the LTE base station 1 Based on the address information (IP) of the), it is possible to distinguish the communication packet transmission path of the device, that is, LTE base station 1 (S140).

Accordingly, the backhaul agent 100, the backhaul signal of the LTE base station 1, that is, the first communication packet, the identification path information for identifying the LTE base station 1, that is, the address information (IP) of the LTE base station 1 Insert (encapsulate) the included path information for identification (S143), and generate the second communication packet through tunneling for inserting (encapsulation) the second path information for sending to the LTE eNB 40. (S146).

The backhaul agent 100 then provides the second communication packet generated as described above to the LTE eNB 40 in accordance with the second path information (S150).

When the LTE eNB 40 receives the second communication packet from the backhaul agent 100 as described above, the LTE eNB 40 deletes (de-encapsulates) the second path information from the second communication packet (S160).

In addition, the LTE eNB 40 transmits the LTE wireless communication to the backhaul terminal 200 according to the identification path information, according to the identification path information, in the first communication packet obtained by deleting the second path information from the second communication packet (S170).

The backhaul terminal 200 obtains a backhaul signal of the first communication packet, that is, the LTE base station 1, by deleting (de-encapsulating) identification path information from the first communication packet received from the LTE eNB 40. It may be (S180).

Accordingly, the backhaul terminal 200 transmits a backhaul signal of the first communication packet, that is, the LTE base station 1, obtained by deleting (de-encapsulating) the identification path information, and a destination address (DIP: LTE) of the first communication packet. The base station 1 transmits to the corresponding LTE base station 1 according to the address information (IP) of the base station 1 (S190).

Accordingly, the LTE base station 1 deletes the first path information from the first communication packet received from the backhaul terminal 200, that is, the backhaul signal (first path information + communication packet) of the LTE base station 1 (de-in). After encapsulation (S200), the communication packet will be transmitted as a downlink signal to the corresponding terminal (S205).

Accordingly, in the downlink communication packet transmission path (b), the first communication packet of the LTE base station 1 received from the LTE core network 20 in step S130 to the backhaul agent 100 and the backhaul terminal in step S190. The backhaul signal (first communication packet) of the LTE base station 1 provided to the corresponding device, that is, the LTE base station 1 at 200, becomes the same.

Hereinafter, referring to FIG. 6, a method of operating a backhaul terminal (device) according to a preferred embodiment of the present invention will be described in more detail.

The method of operating the backhaul terminal 200 according to the present invention may include at least one device 50 connected to the backhaul terminal 200, for example, a backhaul signal (uplink) of the LTE base station 1 from the LTE base station 1. If the communication packet is received (S300 Yes), the identification path information for identifying the LTE base station 1 will be inserted into the first communication packet of the LTE base station 1 (S310).

In this case, as shown in Fig. 2, the first communication packet received from the LTE base station 1, that is, the backhaul signal of the LTE base station 1, the communication packet from the terminal is carried in the payload, and the SGW 24 The first path information specifying the IP as the destination address (DIP) and the address information (IP) of the LTE base station 1 as the source address (SIP) may be inserted as a header.

In more detail, the operation method of the backhaul terminal 200 according to the present invention identifies the LTE base station 1 in the backhaul signal, that is, the first communication packet, of the LTE base station 1 received in the form described above. Tunneling is performed to insert (encapsulate) identification path information for the purpose of encapsulation.

Hereinafter, for convenience of description, the first communication packet after inserting (encapsulating) the identification path information into the first communication packet in step S310 will be described as an 'first communication packet'.

In addition, in the method of operating the backhaul terminal 200 according to the present invention, the base station apparatus 40, that is, the LTE, is processed through the LTE radio method by processing the first communication packet 'inserted with the identification path information as described above as an LTE radio signal. Transmit to eNB 40 (S320).

On the other hand, the operation method of the backhaul terminal 200 according to the present invention, if the first communication packet 'LTE of the LTE base station 1 is received from the LTE eNB 40 (S330 Yes), it is identified in the first communication packet' By deleting (de-encapsulating) the route information, the first communication packet, that is, a backhaul signal (downlink) of the LTE base station 1 can be obtained (S340).

Accordingly, in the method of operating the backhaul terminal 200 according to the present invention, the first communication packet obtained by deleting (de-encapsulating) the identification path information, that is, the backhaul signal of the LTE base station 1, is transmitted to the first communication packet. The destination address (DIP: address information (IP) of the LTE base station 1) will be transmitted to the corresponding LTE base station 1 (S350).

As described above, in the method of operating the backhaul terminal 200 according to the present invention, as long as the operation is not terminated (S360 No), the path information for identifying the backhaul signal of the device connected to the device, for example, the LTE base station 1, that is, the first communication packet. Insert (encapsulate) and transmit the data to the LTE eNB 40 through the LTE radio system, and delete (de-encapsulate) the path information for identification from the first communication packet of the LTE base station 1 received. The device may be provided to the LTE eNB 40.

Hereinafter, referring to FIG. 7, a method of operating the backhaul agent (apparatus) according to the preferred embodiment of the present invention will be described in more detail.

In the method of operating the backhaul agent 100 according to the present invention, when the second communication packet of the LTE base station 1 is received from the base station apparatus 40, that is, the LTE eNB 40 (S400 Yes), the second communication packet In operation S410, the second path information is deleted (de-encapsulated).

In addition, in the method of operating the backhaul agent 100 according to the present invention, if the first communication packet is obtained after the second path information is deleted from the second communication packet in step S410, the identification path in the first communication packet ' The information is deleted (de-encapsulated) (S420).

At this time, the operation method of the backhaul agent 100 according to the present invention, the address information of the device identified in the path information for identification of the first communication packet 'identified in step S410, that is, the address information (IP) of the LTE base station 1 On the basis of this, it is possible to distinguish the communication packet transmission path of the device, that is, LTE base station 1 (S430).

In addition, the operation method of the backhaul agent 100 according to the present invention, the first communication packet, that is, the backhaul signal (uplink) of the LTE base station 1 obtained in step S420 of the LTE core network 20 of the first communication packet Provided to the SGW 24 according to the first path information (S440).

Accordingly, in the LTE core network 20, the first communication packet provided from the backhaul agent 100, that is, only the first path information is deleted from the backhaul signal of the LTE base station 1 (de-encapsulation) and then the uplink of the terminal. The communication packet according to the signal can be exported to the external network (5).

On the other hand, the operation method of the backhaul agent 100 according to the present invention, if the first communication packet of the LTE base station 1 is received from the core network 10, for example, LTE core network 20 (S450 Yes), Based on the address information of the corresponding device identified in the 1 communication packet, that is, the address information (IP) of the LTE base station 1, the communication packet transmission path of the device, that is, the LTE base station 1 may be distinguished (S460).

In addition, the operation method of the backhaul agent 100 according to the present invention, the path information for identification for identifying the LTE base station (1) to the backhaul signal of the LTE base station (1), the first communication packet, that is, LTE base station (1) Insert (encapsulate) identification path information including the address information (IP) of the device (S470), and insert through the tunneling to insert (encapsulate) the second path information for sending to the LTE eNB 40. 2 generates a communication packet (S480).

The method for operating the backhaul agent 100 according to the present invention provides the second communication packet generated as described above to the LTE eNB 40 according to the second path information (S490).

As such, the method of operating the backhaul agent 100 according to the present invention will perform the steps after entering the above-described S400 unless the operation is terminated (S500 No).

As described above, the method for controlling the backhaul system according to the preferred embodiment of the present invention utilizes the base station apparatus 40, that is, the LTE eNB 40, while wirelessly implementing the backhaul between the base station and the core network. The implementation of backhaul can prevent problems such as the encapsulation / de-encapsulation repetition process of the core network end and the problem of not being able to distinguish the communication packet transmission path by device (base station).

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

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

According to the control method of the backhaul system and the backhaul system according to the present invention, while implementing the backhaul between the base station and the core network in a wireless manner by using the base station apparatus of the mobile communication, the problem expected by implementing the backhaul in a wireless manner As it can be prevented, it is not only the use of related technology but the possibility of marketing or sales of the applied device as well as the use of the related technology is sufficient and practically obvious, so that the industrial availability is It is an invention.

100: backhaul agent
110: packet (transmission) receiver 120: core function
130: gateway function unit 140: interface conversion unit
200: backhaul terminal
210: packet (transmitter) receiving unit 220: interface conversion unit
230: gateway function unit 240: modem unit

Claims (16)

Claim 1 was abandoned upon payment of a set-up registration fee. Receiving the first communication packet from at least one device to insert the first path information in the communication packet to generate the first communication packet, and the identification path information for identifying the device that generated the first communication packet; A backhaul terminal inserted into the first communication packet and transmitted to the base station apparatus; And
When receiving the second communication packet from the base station apparatus for generating a second communication packet by inserting second path information into the first communication packet received from the backhaul terminal, the second path information in the second communication packet. And a backhaul agent that deletes the identification path information and provides the first communication packet to a core network so that only the first path information is deleted from the first communication packet. Backhaul system. Claim 2 has been abandoned upon payment of a set-up fee. The method of claim 1,
In the identification route information,
And a unique identifier assigned to the device by the address information of the device or the backhaul terminal. Claim 3 has been abandoned upon payment of a set-up fee. The method of claim 2,
The backhaul agent,
And a communication packet transmission path of the device based on the address information of the device or the unique identifier in the identification path information. A packet receiver configured to receive a second communication packet generated by inserting second path information into the first communication packet from the base station apparatus receiving the first communication packet generated by inserting the first path information into the communication packet; And
And a core function unit which deletes the second path information from the second communication packet and provides the core network to the core network so that only the first path information is deleted. The method of claim 4, wherein
In the second communication packet, before the second path information is inserted into the first communication packet, identification path information for identifying the device that generated the first communication packet is pre-inserted. Backhaul Agent Device. The method of claim 5,
In the identification route information,
And a unique identifier assigned to the device or address information of the device. The method of claim 5,
And deleting the second path information from the second communication packet by the core function unit, deleting the identification path information and providing the first communication packet to the core network. Backhaul agent. A packet receiver configured to receive the first communication packet from at least one device inserting first path information into the communication packet to generate the first communication packet;
A gateway function unit inserting identification path information for identifying a device that has generated the first communication packet into the first communication packet; And
And a modem unit for transmitting the first communication packet into which the identification path information is inserted, to the base station apparatus. The method of claim 8,
In the identification route information,
And a unique identifier assigned to the device by the address information of the device or the backhaul terminal, which is used to distinguish a communication packet transmission path of the device. Receiving, by the backhaul terminal, a first communication packet generated by inserting first path information into the communication packet from at least one device;
The backhaul terminal inserting identification path information for identifying a device that has generated the first communication packet into the first communication packet and transmitting the same to the base station apparatus;
Generating, by the base station apparatus, a second communication packet by inserting second path information into the first communication packet received from the backhaul terminal;
When the backhaul agent receives the second communication packet from the base station apparatus, the backhaul agent deletes the second path information and the identification path information from the second communication packet and provides the first communication packet to the core network. The core network control method of the backhaul system comprising the step of deleting only the first path information from the first communication packet. A packet receiving step of receiving a second communication packet generated by inserting second path information into the first communication packet from a base station apparatus receiving the first communication packet generated by inserting first path information into the communication packet; And
And transmitting the packet to the core network after deleting the second path information from the second communication packet so that only the first path information is deleted in the core network. Way. The method of claim 11,
In the second communication packet, before the second path information is inserted into the first communication packet, identification path information for identifying the device that generated the first communication packet is pre-inserted. Operation method of backhaul agent device. The method of claim 12,
The packet transmission step,
And deleting the second path information and the identification path information from the second communication packet to provide the first communication packet to the core network. The method of claim 12,
The identification path information includes address information of the device or a unique identifier assigned to the device.
And classifying a communication packet transmission path of the device based on the address information or the unique identifier of the device in the identification path information. A packet receiving step of receiving the first communication packet from at least one device inserting first path information into the communication packet to generate the first communication packet;
A path information insertion step of inserting identification path information for identifying a device that has generated the first communication packet into the first communication packet; And
And a packet transmission step of transmitting a first communication packet into which the identification path information is inserted, to a base station apparatus. The method of claim 15,
In the identification route information,
And a unique identifier assigned to the device by the address information of the device or the backhaul terminal, which is used to distinguish a communication packet transmission path of the device.

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