KR20160010354A

KR20160010354A - data routing method for wireless backhaul system

Info

Publication number: KR20160010354A
Application number: KR1020150101258A
Authority: KR
Inventors: 정진섭; 지승환; 박규태
Original assignee: 주식회사 이노와이어리스
Priority date: 2014-07-18
Filing date: 2015-07-16
Publication date: 2016-01-27
Also published as: KR101665934B1

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data routing method in a wireless backhaul system employing a multi-radio transmission technology that efficiently routes data in order to minimize delay when a multi-radio transmission technology is applied to a backhaul terminal in a wireless backhaul system.
According to the data routing method in the wireless backhaul system according to the first aspect of the present invention, a general terminal or a backhaul terminal is wirelessly connected to a backhaul base station, a backhaul terminal is connected to a WiFi AP, a 3G The base station or the LTE base station is connected to the backhaul base station by a backhaul agent provided in the LTE network or the backhaul base station, and when the terminal connected to the backhaul base station is a backhaul terminal, RAB), sets a gateway address for the activated resource to its own address, and primarily receives all data generated in the backhaul terminal through the set address.
In the first aspect, the backhaul agent removes the header added between the backhaul terminal and the backhaul base station with respect to the data transmitted from the backhaul terminal, and transmits the data to the 3G network or the LTE network. And adds a header for routing between the backhaul terminal and the backhaul base station with respect to data to be transmitted to the terminal via the backhaul.
The backhaul agent removes the header added between the backhaul terminal and the backhaul base station from the data transmitted from the backhaul base station received from the backhaul base station and transmits the data to the Internet network. And adds a header for routing between the backhaul terminal and the backhaul base station with respect to the data.
The amount and characteristics of resources reserved in the backhaul base station are determined using a QoS Class Identifier (QCI) or an Aggregated Maximum Bit Rate (AMBR).

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a data routing method for a wireless backhaul system,

The present invention relates to a wireless backhaul system, and more particularly, to a wireless backhaul system that efficiently routes data in order to minimize delay when a multi-wireless transmission technique is applied to a backhaul terminal in a wireless backhaul system. To a data routing method.

As is well known, a femto cell base station (hereinafter, simply referred to as a 'femto base station') is a very small mobile communication base station connected to a mobile communication core network through a broadband network installed in a house or an office. These femto base stations have various advantages such as expanding the indoor coverage, improving the communication quality, and providing various wired / wireless convergence services efficiently.

In 3GPP LTE (Long Term Evolution) or LTE Advanced (LTE), base stations such as evolved NodeB (eNB) and home evolved NodeB (HeNB) are defined. The eNB is a macro base station that manages a general macro cell, and the HeNB is a femto base station that controls a femtocell. That is, 3GPP considers an environment in which a femto base station that can be connected to only a specific user is installed separately from an existing macro base station. At this time, the femto base station may be installed by a user or a provider for the purpose of increasing coverage, increasing capacity, or providing other differentiated services. The service coverage of a femto base station can be considered from a minimum of several meters to a maximum macro service coverage degree.

Meanwhile, in a wireless communication system, a wired connection between a base station and a core network requires a large installation cost, and an additional cost increases each time the base stations are installed. To solve this problem, a backhaul terminal is introduced, and a WiFi access point (WiFi AP), a 3G or an LTE base station (for example, a femtocell base station) is connected to the backhaul terminal, The backhaul terminal is connected to the backhaul base station wirelessly, and the backhaul base station is wired to the Internet or 3G / LTE core network.

1 is a view for explaining a network configuration and an operation procedure of the conventional wireless backhaul system. 1, according to a network configuration of a conventional wireless backhaul system, a backhaul base station can be connected to a general terminal (concept corresponding to a backhaul terminal) or a backhaul terminal wirelessly, and a backhaul terminal can be connected to a WiFi AP ) Or a 3G / LTE base station. Hereinafter, a general terminal directly connected to a backhaul base station is referred to as a general terminal, and a general terminal connected to a backhaul base station through a backhaul terminal is referred to as a backhaul terminal.

In the above-described conventional wireless backhaul system, for example, a wireless backhaul system using LTE technology, LTE technology is applied to communication between a backhaul base station and a backhaul terminal. As described above, a backhaul terminal is interworked with a WiFi AP or a 3G / LTE base station do. In FIG. 1, the IP indicated in blue indicates the source IP (IP) and the IP indicated in yellow indicates the destination IP. The UE IP and the B-UE IP indicate the IP addresses assigned to the backhaul terminal and the backhaul terminal, respectively. The Server IP is an IP address to which the UE via the backhaul is connected. For example, .net, www.google.com, etc.). The UE TEID indicates a unique ID allocated to the backhaul terminal UE by GTP (GPRS Tunneling Protocol), and the B-UE TEID indicates a unique TEID assigned to the backhaul terminal B-UE . Femto IP indicates an IP address assigned to a femto base station, i.e., a 3G / LTE base station linked to a backhaul terminal, Macro IP indicates an IP address of a backhaul base station, S-GW IP and P-GW IP indicate a serving gateway and a PDN (Packet Data Network) Indicates the IP address assigned to the gateway.

In this state, when a terminal via a backhaul accesses a 3G / LTE base station connected to a backhaul terminal in a relay form, the backhaul terminal receives an IP address (UE IP) from the 3G / LTE network (step S1) And all data exchanged between the 3G / LTE network, the corresponding IP address is used. Next, the backhaul terminal receives an IP address (B-UE IP) from the 3G / LTE network (step S3) when accessing the backhaul base station. Subsequently, all data exchanged between the backhaul terminal and the 3G / (B-UE IP) is used.

As a result, all the data of the terminal via the backhaul receiving the service through the 3G / LTE base station connected to the backhaul terminal is encapsulated into the IP address (B-UE IP) of the backhaul terminal and the serving gateway (Serving GateWay; S-GW) (step S4).

Next, the serving gateway receiving the corresponding data primarily processes the IP header (macro IP and S-GW IP) added by the backhaul base station and delivers the IP header to the external Internet network, that is, the PDN gateway (step S5). Next, the IP address of the backhaul terminal is checked in the P-GW / DPI (Deep Packet Inspection) step. In this case, since the destination IP address is the serving gateway, the corresponding data is transmitted again to the serving gateway in the 3G / LTE network )do.

Next, the serving gateway receiving the corresponding data processes the IP header added by the backhaul terminal and delivers the processed IP header to the external Internet network, that is, the PDN gateway (step S7). Finally, after confirming the destination IP address of the corresponding data, the P-GW / DPI transmits the corresponding data to the destination IP address via the Internet (step S8).

According to the above-described conventional wireless backhaul system, it is possible to construct a backhaul network without modifying the backhaul base station and the backhaul terminal, and it is advantageous that the system development is easy because the techniques already developed are applied.

However, in order to route the data generated from the backhaul terminal to the Internet, it is necessary to repeatedly route the serving gateway and the PDN gateway. As a result, routing delay occurs, resulting in the throughput of the data application and the real- VoLTE) deteriorates.

In addition, the process of confirming the IP address of the terminal via the backhaul in the P-GW / DPI and transmitting the data to the serving gateway is generally a procedure that is not permitted by the network operator for security reasons. Therefore, in order to support this, it is necessary to assign a specific IP band to the backhaul terminal and allow the corresponding operation only for the corresponding band, which means that it is necessary to change the IP routing table in the P-GW / DPI.

Prior Art: 10-2014-0077327 Disclosure of the Invention Problems to be Solved by the Invention A method of allocating resources between a backhaul repeater and a base station in a wireless backhaul system

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a wireless backhaul system that efficiently routes data in order to minimize delay when a multi- And to provide a data routing method in a system.

Another object of the present invention is to provide a multi-radio transmission technology capable of minimizing a time delay based on a WiFi AP connected to a backhaul terminal and an IP address of data originating at a backhaul-via terminal in a 3G / LTE base station, And a method of routing data in a wireless backhaul system to which the present invention is applied.

Another object of the present invention is to provide a backhaul network capable of introducing backhaul network without changing the core network, that is, before data generated in a backhaul terminal is introduced into a 3G network or an LTE network, The present invention provides a data routing method in a wireless backhaul system to which a multi-radio transmission technology is applied, in which a base station and an LTE base station are recognized as being directly connected to the base station.

It is still another object of the present invention to provide a data routing method in a wireless backhaul system to which multiple wireless transmission technology is applied in order to efficiently perform data offloading on data generated in a backhaul terminal via a WiFi AP connected to a backhaul terminal .

According to a first aspect of the present invention, there is provided a data routing method in a wireless backhaul system including a multi-radio transmission technology, a general terminal or a backhaul terminal is wirelessly connected to a backhaul base station, The backhaul terminal is connected to the backhaul base station in the LTE network or the backhaul base station in the wireless backhaul system connected through the WiFi AP, the 3G base station or the LTE base station. If the terminal connected to the backhaul base station is a backhaul terminal, Allocates a reserved wireless link (E-RAB), sets a gateway address for the activated resource to its own address, and primarily receives all data generated in the backhaul terminal through the set address.

In the first aspect, the backhaul agent removes the header added between the backhaul terminal and the backhaul base station with respect to the data transmitted from the backhaul terminal, and transmits the data to the 3G network or the LTE network. And adds a header for routing between the backhaul terminal and the backhaul base station with respect to data to be transmitted to the terminal via the backhaul.

The backhaul agent removes the header added between the backhaul terminal and the backhaul base station from the data transmitted from the backhaul base station received from the backhaul base station and transmits the data to the Internet network. And adds a header for routing between the backhaul terminal and the backhaul base station with respect to the data.

The amount and characteristics of resources reserved in the backhaul base station are determined using a QoS Class Identifier (QCI) or an Aggregated Maximum Bit Rate (AMBR).

According to a second aspect of the present invention, a general terminal or a backhaul terminal is wirelessly connected to a backhaul base station, a backhaul terminal is connected to a backhaul terminal through a WiFi AP, a 3G base station or an LTE base station, When a backhaul terminal receives IP data generated from a terminal via a backhaul in a WiFi AP interworking with a backhaul terminal, a wireless link section header is added to the data to transmit to the backhaul base station a) a step; The backhaul base station removes the radio link section header from the data received in step (a), restores the data transmitted from the backhaul terminal, adds the GTP / IP header to the restored data, and transmits the restored data to the backhaul agent (b) And the backhaul agent checks whether the IP address of the serving gateway is an IP address assigned by itself and removes the GTP / IP header from the corresponding data if the IP address is an IP address assigned by itself, And (c) transmitting the data to the Internet when the data does not have another GTP / IP header. A method of routing data in a wireless backhaul system using multiple wireless transmission technology is provided.

In the second aspect, the GTP / IP header is a GTP TEID assigned to a backhaul terminal, an IP address of a backhaul base station, and an IP address of a serving gateway.

When the backhaul agent receives IP data from the Internet, it checks whether the destination IP address is an IP address assigned to the backhaul terminal. If the destination IP address is an IP address assigned by the backhaul agent, the GTP information allocated to the backhaul terminal is used (D) forwarding to the backhaul base station; (E) removing the GTP / IP header from the data received in the step (d) and adding the header of the GTP / IP to the backhaul base station and transmitting the header to the backhaul terminal, And (f) when the GTP / IP header does not exist in the data, transmitting the GTP / IP header to the WiFi AP.

According to a third aspect of the present invention, a general terminal or a backhaul terminal is wirelessly connected to a backhaul base station, a backhaul terminal is connected to a backhaul terminal through a WiFi AP, a 3G base station or an LTE base station, (H) performed in a wireless backhaul system equipped with an agent, in which a general terminal in a backhaul base station adds a radio link interval header to IP data generated in itself and transmits the IP link data to a backhaul base station; The backhaul base station removes the radio link section header from the data received in step (h), restores the data transmitted by the general terminal in the backhaul base station, adds the GTP / IP header to the restored data, and transmits the restored data to the backhaul agent (i), and if the backhaul agent determines that the IP address of the serving gateway is an IP address assigned by the backhaul agent, and if the backhaul agent is not the IP address assigned by the backhaul agent, transmits the received data to the core network without further operation A method for routing data in a wireless backhaul system to which multiple wireless transmission technology is applied is provided.

In the third aspect, the GTP / IP header added in step (h) is a GTP TEID allocated to a general terminal, a backhaul base station IP address, and a serving gateway IP address.

(K) if the backhaul agent receives IP data from the core network, determining that the destination IP address is an IP address assigned to the backhaul terminal; If it is determined in step (l) that the IP address is not the IP address assigned by the user, (l) transmitting the received data to the backhaul base station as it is without any additional operation; and removing the GTP / IP header from the data received by the backhaul base station And adding the radio link section header to the general terminal to transmit the radio link section header to the general terminal.

According to a fourth aspect of the present invention, a general terminal or a backhaul terminal is wirelessly connected to a backhaul base station, a backhaul terminal is connected to a backhaul terminal through a WiFi AP, a 3G base station or an LTE base station, (O) performing a step (o) in a wireless backhaul system equipped with an agent, wherein a terminal via a backhaul adds a radio link header to self-generated IP data and transmits the radio link header to a 3G base station or an LTE base station; The 3G base station or the LTE base station removes the radio link section header from the data received in the step (o), restores the data transmitted by the backhaul terminal, adds the GTP TEID, 3G, Adding an IP address and a serving gateway IP address of the LTE base station to the backhaul terminal; (Q) adding a radio link header to data received in the step (p) and transmitting the radio link header to the backhaul base station; The backhaul base station removes the radio link section header from the corresponding data received in step (q) to recover the data transmitted from the backhaul terminal, and adds the GTP TEID allocated to the backhaul terminal and the IP address of the backhaul base station (R) adding the IP address of the serving gateway to the backhaul agent, and checking whether the backhaul agent checks whether the serving gateway IP address added in the step (r) (S) to the core network after removing the GTP TEID, the backhaul base station IP address, and the serving gateway IP address allocated to the backhaul terminal from the data received in the step (r) in the case of the IP address, There is provided a data routing method in a wireless backhaul system to which the present invention is applied.

In the fourth feature, when the backhaul agent receives data from the core network, it checks whether the IP address of the called terminal is the IP address assigned by the backhaul agent. If the IP address is the IP address assigned by the backhaul agent, (T) adding the TEID, the IP address of the backhaul base station and the IP address of the serving gateway to the backhaul base station; (U) removing the GTP TEID allocated to the backhaul terminal, the IP address of the backhaul base station, and the IP address of the serving gateway from the data received in the step (t) and adding the radio link header to the backhaul terminal ; Removing the radio link section header from the data received in step (u) to restore the data transmitted from the backhaul base station, and transmitting the restored data to the 3G base station or the LTE base station; The 3G or LTE base station transmits the GTP TEID assigned to the backhaul terminal, the IP address of the 3G base station or the LTE base station and the serving base station, which are used for routing between the 3G base station or the LTE base station and the core network in the data received in the step (v) (W) adding a radio link header after removing an IP address of a gateway and transmitting the radio link header to a terminal via a backhaul, and a step (w) of removing the wireless link section header from the data received in the step (w) (X).

According to the data routing method in the wireless backhaul system to which the multi-radio transmission technology of the present invention is applied, it is possible to minimize the deterioration of the quality of service used in the backhaul-based terminal by minimizing the IP data routing delay of the terminal through the backhaul.

Further, according to the present invention, since the influence due to the introduction of the backhaul network is accommodated in the backhaul agent, it is not necessary to change the core network, for example, to change the routing table of the core network, and as a result, introduction of the backhaul network becomes easy.

Furthermore, it is possible to offload data generated at a terminal via a backhaul connected to a WiFi AP connected to a backhaul terminal, thereby reducing the load on the core network.

1 is a diagram illustrating a network configuration and an operational procedure of a conventional wireless backhaul system.
2 is a network configuration diagram of a wireless backhaul system to which the multiple wireless transmission technology of the present invention is applied.
3 is a sequence chart illustrating an operational procedure of the LTE wireless backhaul system of the present invention.
4 is a diagram for explaining a data routing procedure for a backhaul-connected terminal connected to a WiFi AP in a wireless backhaul system to which a multiple wireless transmission technology of the present invention is applied;
5 is a diagram illustrating a data routing procedure for a backhaul-based terminal connected to a 3G / LTE base station in a wireless backhaul system to which a multi-radio transmission technology of the present invention is applied;

Hereinafter, a preferred embodiment of a data routing method in a wireless backhaul system to which the multi-radio transmission technology of the present invention is applied will be described in detail with reference to the accompanying drawings.

2 is a network configuration diagram of a wireless backhaul system to which the multi-radio transmission technology of the present invention is applied. As shown in FIG. 2, according to the network configuration of the wireless backhaul system of the present invention, a general terminal or a backhaul terminal can be wirelessly connected to a backhaul base station, and a general terminal, that is, a terminal via a backhaul, / LTE base station (e. G., A femtocell base station).

In the wireless backhaul system of the present invention, the backhaul agent may be implemented as a software module in an LTE network or a backhaul base station, or may be implemented as a separate device. In this regard, in the existing LTE network, only the base link in which resources are not reserved at the time of terminal activation is activated. However, according to the present invention, in the case of a backhaul terminal, a backhaul agent transmits a radio link (E-RAB) Lt; / RTI > Here, the amount and characteristics of resources reserved in the backhaul base station can be determined using a QoS Class Identifier (QCI) or an Aggregated Maximum Bit Rate (AMBR).

The allocation of resources for which the resource is reserved, which is started from the backhaul agent, can occur a plurality of times in consideration of the service of the terminal via the backhaul linked to the backhaul terminal in order to satisfy different service quality according to the data type. The backhaul agent also sets the gateway address for the active resource to its own address. In this way, all data originating from the backhaul terminal is primarily received by the backhaul agent.

The backhaul agent also removes the header added between the backhaul terminal and the backhaul base station with respect to the downlink data received from the backhaul base station, that is, the data transmitted from the terminal via the backhaul, and then transmits the header to the 3G network and the LTE network. Will be described later.

The backhaul agent also adds a header for routing between the backhaul terminal and the backhaul base station for the uplink data (data to be delivered to the terminal via the backhaul) received from the 3G network and the LTE network, Will be described later.

The backhaul agent also removes the header added between the backhaul terminal and the backhaul base station for the uplink data (data transmitted from the backhaul terminal) received from the backhaul base station, and then transmits the header to the Internet network. Will be described later.

The backhaul agent also adds a header for routing between the backhaul terminal and the backhaul base station with respect to the downlink data (data to be transmitted to the terminal via the backhaul) received from the Internet network, and detailed operation and routing procedures will be described later.

3 is a sequence chart for explaining the operation of the LTE wireless backhaul system according to the present invention. As shown in FIG. 3, the LTE wireless backhaul system of the present invention includes a backhaul agent module and is configured to operate efficiently in a backhaul network environment.

That is, according to the LTE wireless backhaul system of the present invention, in order to solve the disadvantage that only the base link, which is not reserved in the past, is activated when the backhaul terminal is activated, the backhaul agent checks the mobile terminal is the backhaul terminal, (E-RAB) < / RTI >

Specifically, according to the LTE wireless backhaul system of the present invention, when the power of the backhaul terminal is turned on, an RRC connection establishment procedure is performed between the backhaul terminal and the backhaul base station. Thereafter, authentication and location registration procedures are performed between the backhaul agent and the backhaul terminal. In the location registration process, the backhaul terminal is recognized only in the backhaul agent, and the backhaul terminal is not recognized in the LTE core network.

Meanwhile, the backhaul agent according to the present invention transmits a unique ID to a backhaul base station through a downlink (DL) non-access stratum (NAS) transport procedure in association with a terminal performing a registration procedure request. In response to this, the backhaul base station performs a NAS transmission procedure with the backhaul terminal to acquire the unique ID of the backhaul terminal and then reports it to the backhaul agent through a UL (Uplink) NAS transmission procedure. The agent can check whether the terminal registered in the current LTE core network is a backhaul terminal based on the received ID.

Meanwhile, in addition to the above-described backhaul terminal checking process, the LTE core network allocates radio link resources to the backhaul terminals by transmitting an Initial Context Setup Request, which is an S1 control message, to the backhaul base station through the backhaul agent. In this process, And sets its own address to the gateway address for data processing of the terminal via the backhaul. When allocating the initial resource, the radio resource is not reserved or a fixed resource is allocated.

Meanwhile, the backhaul base station performs resource allocation so as to satisfy the required quality of service for both the user terminal connected to the backhaul terminal and the backhaul terminal. In the case of the backhaul terminal, since data of a plurality of backhaul terminals are exchanged, .

For this, the backhaul base station acquires the latest terminal capability from the backhaul terminal by performing the RRC Connection Reconfiguration procedure with the backhaul terminal. The backhaul base station then transmits an Initial Context Setup Response, which is an S1 control message including the terminal capability information, to the LTE core network via the backhaul agent.

Meanwhile, the backhaul agent further allocates resources to the backhaul base station when the currently registered terminal is a backhaul terminal. The amount and characteristics of resources reserved in the backhaul base station can be determined based on QCI or AMBR as described above . Here, QCI is a quality-of-service class identifier parameter used to indicate a service level in an LTE service, and can be used for priority-based traffic scheduling in a transit interval as well as a gateway. The AMBR is the maximum aggregate bit rate. In order to prevent multiple bearers from using excessive network resources in the LTE service, the sum of bandwidths of multiple EPS bearers can be prevented from exceeding a certain level through the AMBR.

Referring back to FIG. 3, the backhaul agent transmits an E-RAB Setup Request message to the backhaul base station in order to allocate resources to the backhaul base station. In response, the backhaul base station adds an additional resource reservation After the RRC connection configuration change procedure with the backhaul terminal is performed to establish the link, the E-RAB Setup Response message is transmitted to the backhaul agent as a result. In this process, the backhaul agent can set its own address as a gateway address for data processing of the terminal via the backhaul. The E-RAB setup request and response can be performed a plurality of times in consideration of the data service requirements of the terminal via the backhaul.

4 is a diagram illustrating a data routing process for a backhaul-connected terminal connected to a WiFi AP in a wireless backhaul system to which a multi-radio transmission technology of the present invention is applied. As shown in FIG. 4, according to the present embodiment, a backhaul terminal that receives IP data generated in a backhaul terminal via a WiFi AP in cooperation with a backhaul terminal (step S11) receives a wireless link section header (not shown) And further transmitted to the backhaul base station (step S12).

Next, the backhaul base station removes the radio link section header from the data received from the backhaul terminal and restores the data transmitted from the backhaul terminal. Then, the GTP / IP header, i.e., the GTP TEID (B -UE TEID, an IP address of a backhaul base station (Macro IP), and a serving gateway IP address (S-GW IP) to the backhaul agent (step S13).

Next, the backhaul agent receiving the data from the backhaul base station confirms whether the IP address of the serving gateway is the IP address assigned by itself. If the IP address is the IP address assigned by itself, the GTP / IP header is removed from the corresponding data If the GTP / IP header data has no other GTP / IP header, the GTP / IP header is transmitted to the Internet (step S14).

On the other hand, after receiving the IP data from the Internet, the backhaul agent checks whether the incoming IP address is the IP address assigned to the backhaul terminal. If the IP address is the IP address assigned to the backhaul agent, the GTP information allocated to the backhaul terminal To the backhaul base station.

Next, the backhaul base station removes the GTP / IP header from the received data, adds the header of the wireless link section (not shown) to the backhaul terminal, and transmits the GTP / IP header to the backhaul terminal. If the header does not exist, it is transmitted to the WiFi AP.

Next, in the wireless backhaul system of the present invention, A data routing method for a general terminal connected to a backhaul base station will be described.

First, since the general terminal connected to the backhaul base station operates through a general procedure according to the 3GPP standard, the backhaul agent performs only the function of transmitting the received data to the backhaul base station or the 3G or LTE network without any processing.

Accordingly, the IP data generated in the general terminal in the backhaul base station is transmitted to the backhaul base station by adding the radio link section header, and the backhaul base station removes the radio link section header and restores the data transmitted by the general terminal. Next, the GTP / IP header, that is, the GTP TEID allocated to the general terminal, the backhaul base station IP address, and the serving gateway IP address are added to the restored data and transmitted to the backhaul agent.

Next, the backhaul agent receiving the data checks whether the IP address of the serving gateway is the IP address assigned by itself. If the IP address is not the IP address assigned by the backhaul agent, the backhaul agent simply transfers the received data to the core network without further operation.

On the other hand, after receiving the IP data from the core network, the backhaul agent checks whether the incoming IP address is the IP address assigned to the backhaul terminal. If the IP address is not the IP address allocated to the backhaul agent, . Finally, the backhaul base station adds the GTP / IP header removal and the radio link section header to the general terminal.

5 is a diagram illustrating a data routing method for a backhaul-based terminal connected to a 3G / LTE base station in a wireless backhaul system to which a multi-radio transmission technology of the present invention is applied. As shown in FIG. 5, according to the present embodiment, the IP data generated in the backhaul via terminal is added to the radio link header (not shown) and transmitted to the 3G / LTE base station (step S21). Next, the 3G / LTE base station removes the radio link section header from the received data, restores the data transmitted by the backhaul terminal, and then transmits the GTP / IP header, i.e., the GTP TEID TEID), the IP address of the 3G / LTE base station (3G / LTE IP), and the serving gateway IP address (S-GW IP) to the backhaul terminal (step S22).

After receiving the data, the backhaul terminal adds a radio link header (not shown) to the data, and transmits the data to the backhaul base station. The backhaul base station removes the radio link section header from the data, GTP TEID (B-UE TEID) assigned to the backhaul terminal, IP address (Macro IP) of the backhaul base station and IP address (S-GW) of the serving gateway are added to the restored data. IP) to the backhaul agent (step S23).

Then, the backhaul agent receives the data and confirms whether the added IP address of the serving gateway IP address is the IP address assigned by the backhaul base station. If the IP address is the IP address assigned by the backhaul base station, (B-UE TEID) assigned to the backhaul terminal, the backhaul base station IP address (Macro IP), and the serving gateway IP address (S-GW IP) that have been added for routing between the base station (Step S24).

Next, the core network receiving the data processes the data through the same procedure as the general data processing procedure, and transmits the processed data to the Internet (steps S25 and S26). Accordingly, the data structure transmitted to the Internet is the same as the data structure generated in the general base station, and as a result, the routing delay as in the conventional technique does not occur.

On the other hand, the backhaul agent that receives the data from the core network checks whether the IP address of the called terminal is assigned by itself (step S24). In the case of the IP address assigned by the backhaul agent, the data received for routing between the backhaul base station and the backhaul agent The GTP / IP header assigned to the backhaul terminal, the GTP TEID assigned to the backhaul terminal (B-UE TEID), the backhaul base station's IP address (Macro IP), and the serving gateway's IP address (S-GW IP) (Step S23).

Next, the backhaul base station receiving the data removes the GTP / IP header used for routing between itself and the backhaul agent, adds a wireless link header (not shown) to the data, and transmits the header to the backhaul terminal (step S22) . Next, the backhaul terminal receiving the data reconstructs the data transmitted from the backhaul base station by removing the radio link section header, and transmits the reconstructed data to the 3G / LTE base station (step S22).

Next, the 3G / LTE base station receiving the data transmits the GTP / IP header used for routing between the 3G / LTE base station and the core network, i.e., the GTP TEID (UE TEID) allocated to the terminal via the backhaul, the 3G / LTE base station IP address (3G / LTE IP) and a serving gateway IP address (S-GW IP), adds a radio link header (not shown) to the restored IP data, and transmits the header to the backhaul terminal. Finally, the terminal via the backhaul receiving the data removes the wireless link section header and restores the user IP data (step S21).

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. Variations and changes will be possible. Accordingly, the scope of the present invention should be determined by the following claims.

Claims

A backhaul base station is connected to a general terminal or a backhaul terminal by radio, and a backhaul terminal is performed by a backhaul agent provided in an LTE network or a backhaul base station in a wireless backhaul system connected via a WiFi AP, a 3G base station or an LTE base station ,
When the terminal connected to the backhaul base station is a backhaul terminal, it starts to allocate a radio link (E-RAB) in which additional resources are reserved for the backhaul base station,
A method for routing data in a wireless backhaul system, the method comprising: setting a gateway address for an activated resource as its own address; and receiving all data generated from the backhaul terminal through the set address.

The method according to claim 1,
The backhaul agent removes the header added between the backhaul terminal and the backhaul base station to the data transmitted from the backhaul terminal, and then transmits the data to the 3G or LTE network.
And a header for routing between the backhaul terminal and the backhaul base station is added to the data to be transmitted to the backhaul terminal via the 3G network or the LTE network. Way.

The method according to claim 1,
The backhaul agent removes the header added between the backhaul terminal and the backhaul base station to the data transmitted from the backhaul terminal via the backhaul base station,
Wherein a header for routing between the backhaul terminal and the backhaul base station is added to the data to be transmitted to the terminal via the backhaul received from the Internet network.

4. The method according to any one of claims 1 to 3,
Wherein the amount and characteristics of resources reserved in the backhaul base station are determined using a QoS Class Identifier (QCI) or an Aggregated Maximum Bit Rate (AMBR).

A base station or a backhaul terminal is wirelessly connected to a backhaul base station, a backhaul terminal is connected to a WiFi AP, a 3G base station or an LTE base station, and an LTE network or a backhaul base station is connected to a wireless backhaul system However,
(A) receiving, when a backhaul terminal receives IP data generated in a backhaul terminal via a backhaul in a WiFi AP interworking with a backhaul terminal, adding a wireless link section header to the data and transmitting the data to the backhaul base station;
The backhaul base station removes the radio link section header from the data received in step (a), restores the data transmitted from the backhaul terminal, adds the GTP / IP header to the restored data, and transmits the restored data to the backhaul agent (b) Step and
If the backhaul agent determines that the IP address of the serving gateway is an IP address assigned by itself, the backhaul agent removes the GTP / IP header from the corresponding data if the IP address is the IP address assigned by the backhaul agent, And (c) transmitting the data to the Internet when the GTP / IP header does not have another GTP / IP header.

6. The method of claim 5,
Wherein the GTP / IP header is a GTP TEID assigned to a backhaul terminal, an IP address of a backhaul base station, and an IP address of a serving gateway.

The method according to claim 6,
When the backhaul agent receives IP data from the Internet, it checks whether the destination IP address is an IP address assigned to the backhaul terminal. If the destination IP address is an IP address assigned by the backhaul agent, the GTP information allocated to the backhaul terminal is used (D) forwarding to the backhaul base station;
(E) removing the GTP / IP header from the data received in the step (d) and adding the header of the GTP / IP to the backhaul base station and transmitting the header to the backhaul terminal; and
And (f) when the backhaul terminal does not have a GTP / IP header in the data received in the step (e), transmitting the GTP / IP header to the WiFi AP. / RTI >

A base station or a backhaul terminal is wirelessly connected to a backhaul base station, a backhaul terminal is connected to a WiFi AP, a 3G base station or an LTE base station, and an LTE network or a backhaul base station is connected to a wireless backhaul system However,
(H) transmitting, to a backhaul base station, a general terminal in a backhaul base station adding a radio link section header to IP data generated in itself;
The backhaul base station removes the radio link section header from the data received in step (h), restores the data transmitted by the general terminal in the backhaul base station, adds the GTP / IP header to the restored data, and transmits the restored data to the backhaul agent (i) and
(J) transmitting the received data to the core network without additional operation if the backhaul agent is not the IP address assigned by itself after confirming that the IP address of the serving gateway is the IP address assigned by itself, A method of routing data in a wireless backhaul system with wireless technology.

9. The method of claim 8,
Wherein the GTP / IP header added in step (h) is a GTP TEID assigned to a general terminal, a backhaul base station IP address, and a serving gateway IP address.

10. The method of claim 9,
(K) if the backhaul agent receives IP data from the core network, determining that the destination IP address is an IP address assigned to the backhaul terminal;
(L) transmitting the received data to the backhaul base station as it is without any additional operation if it is not the IP address assigned by itself in the step (l)
(M) removing the GTP / IP header from the data received by the backhaul base station, and adding the header of the GTP / IP to the general terminal after the removal of the GTP / IP header from the data received by the backhaul base station. Routing method.

A base station or a backhaul terminal is wirelessly connected to a backhaul base station, a backhaul terminal is connected to a WiFi AP, a 3G base station or an LTE base station, and an LTE network or a backhaul base station is connected to a wireless backhaul system However,
(O) adding a radio link header to the IP data generated by the backhaul terminal and transmitting the radio link header to the 3G base station or the LTE base station;
The 3G base station or the LTE base station removes the radio link section header from the data received in the step (o), restores the data transmitted by the backhaul terminal, adds the GTP TEID, 3G, Adding an IP address and a serving gateway IP address of the LTE base station to the backhaul terminal;
(Q) adding a radio link header to data received in the step (p) and transmitting the radio link header to the backhaul base station;
The backhaul base station removes the radio link section header from the corresponding data received in step (q) to recover the data transmitted from the backhaul terminal, and adds the GTP TEID allocated to the backhaul terminal and the IP address of the backhaul base station And (r) adding the IP address of the serving gateway to the backhaul agent, and
The backhaul agent checks whether the serving gateway IP address added in the step (r) is an IP address allocated by itself, and allocates the data to the backhaul terminal in the data received in the step (r) (S) of the GTP TEID, the backhaul base station IP address, and the serving gateway IP address to the core network.

12. The method of claim 11,
When the backhaul agent receives data from the core network, it checks whether the IP address of the called terminal is assigned by itself. If the backhaul agent is the IP address assigned by itself, the received data includes the GTP TEID assigned to the backhaul terminal and the IP address of the backhaul base station (T) after adding the IP address of the serving gateway to the backhaul base station;
(U) removing the GTP TEID allocated to the backhaul terminal, the IP address of the backhaul base station, and the IP address of the serving gateway from the data received in the step (t) and adding the radio link header to the backhaul terminal ;
Removing the radio link section header from the data received in step (u) to restore the data transmitted from the backhaul base station, and transmitting the restored data to the 3G base station or the LTE base station;
The 3G or LTE base station transmits the GTP TEID assigned to the backhaul terminal, the IP address of the 3G base station or the LTE base station and the serving base station, which are used for routing between the 3G base station or the LTE base station and the core network in the data received in the step (v) (W) adding the wireless link header after removing the IP address of the gateway and transmitting it to the terminal via the backhaul and
And a step (x) of recovering user data by removing a radio link section header from the data received in the step (w) by the terminal via the backhaul. Data routing method.