KR20170037492A - Methods for transmitting and receiving data using WLAN carriers and Apparatuses thereof - Google Patents

Abstract

One embodiment of the present invention relates to a method and an apparatus for transmitting and/or receiving predetermined user plain data between a base station and a terminal through a wireless local area network (WLAN) carrier when adding the WLAN carrier to an evolved UMTS terrestrial radio access network (E-UTRAN) carrier in a radio access network (RAN) level to transmit the user plain data. According to the present invention, the method comprises the following steps of: receiving configuration information for transmitting/receiving data to/from the base station with an Internet protocol security (IPsec) tunnel through the WLAN carrier; configuring the IPsec tunnel based on the configuration information and setting a data bearer using the IPsec tunnel; and allowing a tunnel entity in the terminal to transmit data received from an upper layer to the base station by using the IPsec tunnel.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for transmitting and receiving data using a WLAN carrier,

This embodiment adds a WLAN carrier to an E-UTRAN carrier at a Radio Access Network (RAN) level to transmit user plane data, and controls to transmit and / or receive specific user plane data via a WLAN carrier between a base station and a terminal And more particularly,

As communications systems evolved, consumers, such as businesses and individuals, used a wide variety of wireless terminals. In a mobile communication system such as LTE (Long Term Evolution) and LTE-Advanced of the current 3GPP series, a high-speed and large-capacity communication system capable of transmitting and receiving various data such as video and wireless data outside a voice- It is required to develop a technique capable of transmitting large-capacity data in accordance with the above-described method. It is possible to efficiently transmit data using a plurality of cells in a method for transmitting a large amount of data.

However, there is a limit to providing a base station to a plurality of terminals that transmit large amount of data using limited frequency resources. In other words, securing a frequency resource that can be used exclusively by a specific service provider is costly.

On the other hand, license-exempt frequency bands that can not be used exclusively by specific operators or specific communication systems can be shared by multiple operators or communication systems. For example, a wireless local area network (WLAN) technology represented by Wi-Fi provides data transmission and reception services using frequency resources of a license-exempt band.

Accordingly, there is a need for research on a technique for a mobile communication system to transmit and receive data to and from a terminal using a corresponding WLAN AP (Access Point). In particular, when a base station transmits and receives data to and from a terminal using a WLAN carrier and a base station carrier, a specific procedure and method are required to be studied. Further, there is a need for a technique for allowing a legacy terminal using only a conventional base station carrier to easily use a WLAN carrier.

The embodiments of the present invention are intended to provide a specific procedure and method for transmitting and receiving data between a terminal and a base station by aggregating or integrating a WLAN carrier and a base station carrier.

In addition, the present embodiments provide a tunnel-based LTE-WLAN integration method for reusing existing WLAN APs and provide a method and apparatus for distinguishing data on a tunnel from IP allocation and change procedures associated with WLAN tunnel configuration do.

In order to solve the above-described problems, one embodiment of the present invention provides a method for transmitting and receiving data between a base station and a base station using an Internet Protocol Security (IPsec) tunnel through a wireless local area network (WLAN) Configuring an IPsec tunnel based on the configuration information, setting up a data bearer using an IPsec tunnel, and transmitting data received from an upper layer in a tunnel entity to a base station using an IPsec tunnel The method comprising the steps of:

Another embodiment provides a method for transmitting and receiving data in a base station, the method comprising: transmitting configuration information for transmitting and receiving data with a terminal using an Internet Protocol Security (IPsec) tunnel through a WLAN (wireless local area network) carrier; And transmitting the received data to an upper layer using an IPsec tunnel in a tunnel entity in the base station.

According to yet another embodiment, there is provided a terminal for transmitting and receiving data,

A receiving unit for receiving configuration information for transmitting / receiving data to / from a base station using an IPsec (Internet Protocol Security) tunnel through a WLAN (wireless local area network) carrier, and an IPsec tunnel based on the configuration information, A controller for setting up a bearer, and a transmitter for transmitting data received from an upper layer in a tunnel entity in the terminal to a base station using an IPsec tunnel.

According to another embodiment of the present invention, there is provided a base station transmitting and receiving data, comprising: a transmitter for transmitting configuration information for transmitting and receiving data to and from a terminal using an IPsec (Internet Protocol Security) tunnel through a WLAN (wireless local area network) carrier; And a controller for transmitting the data received by the tunnel entity in the base station to the upper layer using the IPsec tunnel.

According to the above-described embodiments, the WLAN terminal and the base station carrier can be merged or integrated to transmit and receive data.

In addition, according to the present embodiments, in transmitting and receiving data between a terminal and a base station using a WLAN carrier on the basis of an IP tunnel, it is possible to provide classification processing for each radio bearer.

1 is a diagram for explaining a terminal operation according to an embodiment.
FIG. 2 is a diagram for explaining a conceptual hierarchical structure of a terminal and a base station according to an embodiment.
3 is a diagram for explaining a base station operation according to an embodiment.
4 is a diagram for explaining a tunneling-based WLAN carrier addition procedure according to an embodiment.
5 is a diagram for explaining a terminal configuration according to an embodiment.
6 is a view for explaining a base station configuration according to an embodiment.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

Herein, the MTC terminal may mean a terminal supporting low cost (or low complexity) or a terminal supporting coverage enhancement. In this specification, the MTC terminal may mean a terminal supporting low cost (or low complexity) and coverage enhancement. Alternatively, the MTC terminal may refer to a terminal defined in a specific category for supporting low cost (or low complexity) and / or coverage enhancement.

In other words, the MTC terminal in this specification may mean a newly defined 3GPP Release-13 low cost (or low complexity) UE category / type for performing LTE-based MTC-related operations. Alternatively, the MTC terminal may support enhanced coverage over the existing LTE coverage or a UE category / type defined in the existing 3GPP Release-12 or lower that supports low power consumption, or a newly defined Release-13 low cost low complexity UE category / type.

The wireless communication system in the present invention is widely deployed to provide various communication services such as voice, packet data and the like. A wireless communication system includes a user equipment (UE) and a base station (BS, or eNB). The user terminal in this specification is a comprehensive concept of a terminal in wireless communication. It is a comprehensive concept which means a mobile station (MS), a user terminal (UT), an SS (User Equipment) (Subscriber Station), a wireless device, and the like.

A base station or a cell generally refers to a station that communicates with a user terminal and includes a Node-B, an evolved Node-B (eNB), a sector, a Site, a BTS A base transceiver system, an access point, a relay node, a remote radio head (RRH), a radio unit (RU), and a small cell.

That is, in the present specification, a base station or a cell has a comprehensive meaning indicating a part or function covered by BSC (Base Station Controller) in CDMA, Node-B in WCDMA, eNB in LTE or sector (site) And covers various coverage areas such as megacell, macrocell, microcell, picocell, femtocell and relay node, RRH, RU, and small cell communication range.

Since the various cells listed above exist in the base station controlling each cell, the base station can be interpreted into two meanings. i) the device itself providing a megacell, macrocell, microcell, picocell, femtocell, small cell in relation to the wireless region, or ii) indicating the wireless region itself. i indicate to the base station all devices that are controlled by the same entity or that interact to configure the wireless region as a collaboration. An eNB, an RRH, an antenna, an RU, an LPN, a point, a transmission / reception point, a transmission point, a reception point, and the like are exemplary embodiments of a base station according to a configuration method of a radio area. ii) may indicate to the base station the wireless region itself that is to receive or transmit signals from the perspective of the user terminal or from a neighboring base station.

Therefore, a base station is collectively referred to as a base station, collectively referred to as a megacell, macrocell, microcell, picocell, femtocell, small cell, RRH, antenna, RU, low power node do.

Herein, the user terminal and the base station are used in a broad sense as the two transmitting and receiving subjects used to implement the technical or technical idea described in this specification, and are not limited by a specific term or word. The user terminal and the base station are used in a broad sense as two (uplink or downlink) transmitting and receiving subjects used to implement the technology or technical idea described in the present invention, and are not limited by a specific term or word. Here, an uplink (UL, or uplink) means a method of transmitting / receiving data to / from a base station by a user terminal, and a downlink (DL or downlink) .

There are no restrictions on multiple access schemes applied to wireless communication systems. Various multiple access schemes such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), OFDM-FDMA, OFDM- Can be used. An embodiment of the present invention can be applied to asynchronous wireless communication that evolves into LTE and LTE-Advanced via GSM, WCDMA, and HSPA, and synchronous wireless communication that evolves into CDMA, CDMA-2000, and UMB. The present invention should not be construed as limited to or limited to a specific wireless communication field and should be construed as including all technical fields to which the idea of the present invention can be applied.

A TDD (Time Division Duplex) scheme in which uplink and downlink transmissions are transmitted using different time periods, or an FDD (Frequency Division Duplex) scheme in which they are transmitted using different frequencies can be used.

In systems such as LTE and LTE-Advanced, the uplink and downlink are configured on the basis of one carrier or carrier pair to form a standard. The uplink and the downlink are divided into a Physical Downlink Control Channel (PDCCH), a Physical Control Format Indicator CHannel (PCFICH), a Physical Hybrid ARQ Indicator CHannel, a Physical Uplink Control CHannel (PUCCH), an Enhanced Physical Downlink Control Channel (EPDCCH) Transmits control information through the same control channel, and is configured with data channels such as PDSCH (Physical Downlink Shared CHannel) and PUSCH (Physical Uplink Shared CHannel), and transmits data.

On the other hand, control information can also be transmitted using EPDCCH (enhanced PDCCH or extended PDCCH).

In this specification, a cell refers to a component carrier having a coverage of a signal transmitted from a transmission point or a transmission point or transmission / reception point of a signal transmitted from a transmission / reception point, and a transmission / reception point itself .

The wireless communication system to which the embodiments are applied may be a coordinated multi-point transmission / reception system (CoMP system) or a coordinated multi-point transmission / reception system in which two or more transmission / reception points cooperatively transmit signals. antenna transmission system, or a cooperative multi-cell communication system. A CoMP system may include at least two multipoint transmit and receive points and terminals.

The multi-point transmission / reception point includes a base station or a macro cell (hereinafter referred to as 'eNB'), and at least one mobile station having a high transmission power or a low transmission power in a macro cell area, Lt; / RTI >

Hereinafter, a downlink refers to a communication or communication path from a multipoint transmission / reception point to a terminal, and an uplink refers to a communication or communication path from a terminal to a multiple transmission / reception point. In the downlink, a transmitter may be a part of a multipoint transmission / reception point, and a receiver may be a part of a terminal. In the uplink, the transmitter may be a part of the terminal, and the receiver may be a part of multiple transmission / reception points.

Hereinafter, a situation in which a signal is transmitted / received through a channel such as PUCCH, PUSCH, PDCCH, EPDCCH, and PDSCH is expressed as 'PUCCH, PUSCH, PDCCH, EPDCCH and PDSCH are transmitted and received'.

In the following description, an indication that a PDCCH is transmitted or received or a signal is transmitted or received via a PDCCH may be used to mean transmitting or receiving an EPDCCH or transmitting or receiving a signal through an EPDCCH.

That is, the physical downlink control channel described below may mean a PDCCH, an EPDCCH, or a PDCCH and an EPDCCH.

Also, for convenience of description, EPDCCH, which is an embodiment of the present invention, may be applied to the portion described with PDCCH, and EPDCCH may be applied to the portion described with EPDCCH according to an embodiment of the present invention.

Meanwhile, the High Layer Signaling described below includes RRC signaling for transmitting RRC information including RRC parameters.

The eNB performs downlink transmission to the UEs. The eNB includes a physical downlink shared channel (PDSCH) as a main physical channel for unicast transmission, downlink control information such as scheduling required for reception of a PDSCH, A physical downlink control channel (PDCCH) for transmitting scheduling grant information for transmission in a Physical Uplink Shared Channel (PUSCH). Hereinafter, the transmission / reception of a signal through each channel will be described in a form in which the corresponding channel is transmitted / received.

The WLAN carrier in this specification refers to a wireless resource of a WLAN and may be described in various terms according to needs, such as a WLAN radio link, a WLAN radio, a WLAN radio resource, or a WLAN radio network. Hereinafter, a WLAN radio link, a WLAN radio, a WLAN radio resource, or a WLAN radio network will be described as a WLAN carrier for ease of understanding.

In addition, the term WLAN in this specification refers to a logical WLAN network node. For example, a WLAN AP or a WLAN AC. The WLAN termination may be a WLAN network node such as an existing WLAN AP or an existing WLAN AC, or may be a WLAN network node including an additional function for WLAN merging transmission to an existing WLAN AP or an existing WLAN AC. The WLAN termination may be implemented as an independent entity or as a functional entity contained in another entity. Hereinafter, a WLAN network node will be described as a WLAN terminal or a WLAN AP as needed. In this specification, radio resources provided by the base station eNB are described as base station radio resources, a base station carrier, or an E-UTRAN carrier as needed.

Meanwhile, the tunnel entity in the present specification means an entity for processing data transmitted and received through the IPsec tunnel, and the term is not limited thereto. For example, the tunnel entity includes an IPsec tunnel entity, an entity for transmitting and receiving user data through IPsec, an entity for a radio bearer configured at IPsec, an EPS bearer entity, an adaptation entity, a tunnel upper adaptation entity, and a LWIPEP IPsec Tunnel Encapsulation Protocol) entity, an IPsec tunnel entity via WLAN, and the like. Hereinafter, tunnel entities are described for convenience of understanding, but they should be understood to include all entities having the same function, and may be understood from a functional viewpoint.

In this specification, the IPsec tunnel refers to a tunnel formed between a terminal and a base station for transmitting and receiving data through a WLAN carrier, and may include various terms. For example, IPsec tunnels can be named in various terms, such as GRE tunnels, GTP tunnels, or any tunnel based on encapsulation, and are not limited to the above terms.

WLAN interworking technology provides RAN assisted WLAN interworking. The E-UTRAN may support terminal-based bidirectional traffic steering between the E-UTRAN and the WLAN for terminals in the RRC_IDLE and RRC_CONNECTED states.

The E-UTRAN provides assistance parameters to the terminal via broadcast signaling or dedicated RRC signaling. The RAN helper parameters include at least one of an E-UTRAN signal strength threshold, a WLAN channel utilization threshold, a WLAN backhaul data rate threshold, a WLAN signal strength (or WLAN signal strength threshold, e.g., a BeaconRSSI threshold) and an Offload Preference Indicator One can be included. The E-UTRAN may also provide the terminal with a list of WLAN identifiers via broadcast signaling.

The terminal shall use the access network selection and traffic control rules defined in the TS 36.304 document for traffic steering decisions between the E-UTRAN and the WLAN standardized in the 3GPP TS 23.402 Architecture enhancements for non-3GPP accesses documents. traffic steering rules) or RAN helper parameters to evaluate the ANDSF policies defined in TS 24.312.

When the access network selection and traffic steering rules defined in the TS 36.304 document are satisfied, the terminal may indicate this to an access stratum (AS) upper layer.

When the UE applies the access network selection and traffic control rules, the UE performs traffic control in units of APN (granularity) between the E-UTRAN and the WLAN. In this way, the RAN assisted WLAN interworking function provides only a way of establishing and interworking E-UTRAN and WLAN in standalone manner.

Due to the limitations of the interworking technique using the independent E-UTRAN and WLAN described above, there is a growing need for an LTE-WLAN aggregation technology in which the base station uses E-UTRAN and WLAN radio resources at the PDCP level. However, in order to utilize the LTE-WLAN merging technology at the PDCP level, an upgrade of a legacy WLAN AP is required. For example, upgrading legacy APs is necessary to provide tunnel creation and flow control between base stations and WLAN nodes. To solve this problem, the present embodiment proposes an IPsec tunnel-based LTE-WLAN merging technique capable of reusing legacy APs. In particular, in order to merge the LTE-WLAN based on the IPsec tunnel, a concrete control procedure between the UE and the BS and a user plane data transmission method should be provided. Specifically, in order to establish a tunnel through a WLAN between a base station and a terminal, information necessary for tunnel establishment through a WLAN between the terminal and the base station must be shared. In this case, when a legacy WLAN node (for example, WLAN AP, WLAN AC, WLAN termination) is used, there may be a problem that stable data communication is difficult because the IP address of the terminal can be changed due to a WLAN node change or the like. Even if there is no such problem, IPsec tunnels established between two nodes may be difficult to distinguish and process data according to the characteristics of user data.

As described above, the conventional LTE-WLAN aggregation / integration method requires upgrading of legacy APs in order to provide a merging technique at the PDCP level. In order to solve such a problem, a specific control procedure between the UE and the BS and a user plane data transmission method are not presented in the LTE-WLAN merging / combining method based on the IPsec tunnel. Particularly, when a legacy WLAN node is used, stable data communication may be difficult if the IP address of the terminal is changed due to a change of a WLAN node or the like. In addition, the IPsec tunnel established between the two nodes has a problem that it is difficult to distinguish the bearers according to the data characteristics between the terminal and the base station and to process the data.

The present embodiment, which is devised to solve such a problem, aims to provide a control procedure and a data transmission method for providing a tunnel-based LTE-WLAN merging / integrating technology capable of reusing an existing AP. In particular, it is an object of the present invention to provide a terminal IP allocation and change procedure associated with a WLAN tunnel configuration, and a method of controlling data separately in a tunnel.

1 is a diagram for explaining a terminal operation according to an embodiment.

A method for transmitting and receiving data in a terminal according to an exemplary embodiment includes receiving configuration information for transmitting and receiving data with a base station using an Internet Protocol Security (IPsec) tunnel through a WLAN (wireless local area network) carrier, Configuring an IPsec tunnel based on the information, setting up a data bearer using an IPsec tunnel, and transmitting data received from an upper layer in a tunnel entity in the terminal to the base station using an IPsec tunnel .

Referring to FIG. 1, the UE includes a step of receiving configuration information for transmitting / receiving data to / from a base station using an IPsec tunnel through a WLAN carrier (S110). As described above, the WLAN carrier can be added without changing the existing WLAN node, and the IPsec tunnel can be configured to transmit and receive data between the terminal and the base station. The IPsec tunnel is configured between the terminal and the wireless network and can be configured through a WLAN carrier. As an example, an IPsec tunnel is configured between a terminal and a base station, and can be configured through a WLAN carrier. As another example, an IPsec tunnel is configured between a terminal and a gateway connected to a base station, and can be configured through a WLAN carrier. To this end, the terminal can receive configuration information for configuring the IPsec tunnel from the base station. For example, the configuration information may include at least one of WLAN identification information, Internet Protocol (IP) address information for the IPsec tunnel, Internet Key Exchange (IKE) configuration information, and data bearer identification information using an IPsec tunnel . Here, the IP (Internet Protocol) address information for the IPsec tunnel indicates the base station IP address information or the gateway IP address information connected to the base station. The IKE configuration information indicates parameters used in the IKE authentication procedure. As another example, the configuration information may include WLAN cell configuration information. The WLAN cell configuration information may include one or more of WLAN cell identifier information, WLAN mobility set identifier information and band / frequency information, and WLAN identification information (e.g., BSSID / HESSID / SSIDs). For a cell to perform WLAN access authentication among the WLAN cells, information for instructing WLAN connection authentication in the corresponding cell may be included. As another example, the configuration information may include information that instructs the terminal to perform WLAN connection authentication with configuration information for using the WLAN carrier. In addition, the configuration information may include information necessary for the terminal and the base station to construct the IPsec tunnel through the WLAN carrier.

The above-described configuration information can be received by the terminal through higher layer signaling. For example, the UE may receive the configuration information to be transmitted included in the RRC connection reconfiguration message.

In addition, the terminal includes a step of configuring an IPsec tunnel based on the configuration information and setting a data bearer using the IPsec tunnel (S120). For example, the terminal may establish / configure an IPsec tunnel over the WLAN carrier using the received configuration information. In addition, the terminal can set a data bearer for transmitting / receiving data to / from the base station through the configured IPsec tunnel. The data bearer can be set by the base station. The terminal receiving the above-described configuration information by the base station can set the data bearer using the received configuration information. The data of the corresponding data bearer can be transmitted / received to / from the base station through the above-described IPsec tunnel.

In addition, the terminal includes a step of configuring an IPsec tunnel based on the configuration information and setting a data bearer using the IPsec tunnel (S120). For example, the terminal may establish an IPsec tunnel over the WLAN carrier using the received configuration information. In addition, the terminal can set a data bearer for transmitting / receiving data to / from the base station through the configured IPsec tunnel. The data bearer can be set by the base station. Alternatively, the terminal may set the data bearer using the above-described configuration information. The data of the corresponding data bearer can be transmitted / received to / from the base station through the above-described IPsec tunnel.

In addition, the terminal includes a step of transmitting data received from an upper layer in a tunnel entity in the terminal to the base station using an IPsec tunnel (S130). The tunnel entity can perform data transmission / reception operations between the terminal and the base station through the IPsec tunnel. To this end, the tunnel entity may be configured to be peered to the terminal and the base station, respectively. For example, a tunnel entity of a terminal forwards an IP packet received from an upper layer (for example, an IP layer) to a lower layer. In addition, the tunnel entity of the UE transfers PDUs received from the lower layer to the upper layer. In this case, the tunnel entity distinguishes the SDU for each core network interface bearer (eps bearer) received from the upper layer, adds the bearer identification information to the SDU, and transmits the SDU to the lower layer. The bearer identification information may be one of data radio bearer identification information, eps bearer identification information, and logical channel identification information. Similarly, when a tunnel entity forwards a PDU received from a base station to an upper layer, it can remove and forward the bearer identification information.

Meanwhile, the tunnel entity may be configured to be terminal-specific and may encapsulate and decapsulate data transmitted or received through the IPsec tunnel.

Through the above-described terminal operation, the terminal can configure the IPsec tunnel through the WLAN carrier with the base station to perform data transmission / reception through the IPsec tunnel. To this end, the tunnel entity configured in the terminal and the base station may transmit / receive data through a specific bearer by adding / removing bearer identification information (e.g., DRB-Identity) capable of distinguishing bearers.

Hereinafter, the details of the data transmission / reception configuration between the terminal and the base station including the tunnel entity and the terminal operation will be described in more detail with reference to the drawings.

FIG. 2 is a diagram for explaining a conceptual hierarchical structure of a terminal and a base station according to an embodiment.

Referring to FIG. 2, a terminal and a base station can transmit and receive data through an IPsec tunnel. The IPsec tunnel is configured through a WLAN carrier. Specifically, when the UE transmits uplink data to the BS, the intra-UE tunnel entity 220 receives the SDU for each core network interface bearer from the IP layer. The tunnel entity 220 adds a tunnel header to the received SDU and transmits the tunnel header to a lower layer for transmission. The tunnel header may be the bearer identification information described above, and may be DRB-Identity, for example.

The data transmitted through the IPsec tunnel in the lower layer is received by the lower layer of the base station. The base station tunnel entity 210 configured to peer with the in-terminal tunnel entity 220 removes the tunnel header from the PDU received from the lower layer and delivers the same to an upper layer (for example, the IP layer). As described above, the tunnel header can be bearer identification information. Meanwhile, the IPsec tunnel is configured through the WLAN carrier.

3 is a diagram for explaining a base station operation according to an embodiment.

Referring to FIG. 3, the base station includes a step of transmitting configuration information for transmitting / receiving data to / from a terminal using an IPsec tunnel through a WLAN carrier (S310). For the above-described terminal operation, the base station generates configuration information for configuring the IPsec tunnel and transmits the configuration information to the terminal. The IPsec tunnel may be configured via a WLAN carrier as described above. As an example, an IPsec tunnel is configured between a terminal and a base station, and can be configured through a WLAN carrier. As another example, an IPsec tunnel is configured between a terminal and a gateway connected to a base station, and can be configured through a WLAN carrier. The configuration information for transmitting and receiving data with the terminal using the IPsec tunnel through the WLAN carrier includes WLAN identification information, IP (Internet Protocol) address information for the IPsec tunnel, IKE (Internet Key Exchange) setting information, and data using the IPsec tunnel And at least one of the bearer identification information. Alternatively, the configuration information may comprise WLAN cell configuration information. The WLAN cell configuration information may include one or more of WLAN cell identifier information, WLAN mobility set identifier information and band / frequency information, and WLAN identification information (e.g., BSSID / HESSID / SSIDs). For a cell to perform WLAN access authentication among the WLAN cells, information for instructing WLAN connection authentication in the corresponding cell may be included. Alternatively, the configuration information may include information indicating that the terminal instructs the WLAN connection authentication with the configuration information for using the WLAN carrier. In addition, the configuration information may include information necessary for the terminal and the base station to construct the IPsec tunnel through the WLAN carrier. Here, the IP (Internet Protocol) address information for the IPsec tunnel indicates the base station IP address information or the gateway IP address information connected to the base station. The IKE configuration information indicates parameters used in the IKE authentication procedure.

The above-described configuration information can be transmitted to the terminal through higher layer signaling. For example, the base station may include configuration information in an RRC connection reconfiguration message.

In addition, the base station includes receiving the data using the IPsec tunnel (S320). The base station can configure a tunnel entity for receiving data using an IPsec tunnel. The tunnel entity in the base station can be configured by peering with a tunnel entity configured in the terminal. The base station can receive the uplink data using the IPsec tunnel. Or the base station can transmit downlink data using the IPsec tunnel. The IPsec tunnel can be configured in association with a specific data bearer. That is, data of a specific bearer can be transmitted and received using an IPsec tunnel.

In addition, the base station includes transmitting the received data to the upper layer using the IPsec tunnel in the tunnel entity in the base station (S330). The uplink data received from the UE can be transmitted to an upper layer through a tunnel entity in the base station. In this case, the tunnel entity in the base station may remove the bearer identification information of the uplink data PDU and transmit it to an upper layer such as the IP layer. The bearer identification information may be DRB-Identity.

In this manner, the terminal and the base station can configure the IPsec tunnel through the WLAN carrier, and add / remove the bearer identification information from the tunnel entity, thereby transmitting / receiving data of the data bearer associated with the IPsec tunnel.

The operation of the terminal and the base station described with reference to Figs. 1 to 3 will be described in more detail below.

As described above, the RRC connected terminal can add a WLAN carrier by base station control. The base station can use the WLAN carrier to create a tunnel between the terminal and the base station over the WLAN for the RRC connected terminal in order to add the WLAN carrier without further upgrading of the existing WLAN AP. For example, an IPsec tunnel is configured between a terminal and a base station, and can be configured through a WLAN carrier. As another example, an IPsec tunnel is configured between a terminal and a gateway connected to a base station, and can be configured through a WLAN carrier. For this purpose, it is possible to transmit data based on the IPsec tunnel between the terminal and the base station over the PDCP protocol layer or the PDCP protocol layer through the WLAN. For example, data can be transmitted between the UE and the base station through the WLAN based on the IPsec tunnel under the PDCP protocol layer (i.e., the PDCP PDU). As another example, it is possible to transmit data based on the IPsec tunnel between the UE and the base station via the WLAN in a PDCP protocol layer upper layer (i.e., a PDCP SDU or an IP packet).

Hereinafter, an IPsec tunnel is constructed in the upper part of the PDCP protocol layer to transmit data between the base station and the terminal through the WLAN carrier. However, transmission of data based on the IPsec tunnel under the PDCP protocol layer is also included in the scope of the present invention. do.

In order to provide the above-described LTE-WALN merging / combining technique, the UE reports LTE WLAN Aggregation (LWA) capability including supported WLAN bands. The terminal may have a separate capability bit to indicate that it supports the interworking and merging functions. The UE has a separate capability bit to indicate that it supports a radio bearer (e.g., switched bearer) over a tunnel and a merge that supports a radio bearer (e.g., split bearer) over PDCP on an LTE WLAN merge . The terminal reports the capability to support the radio bearer over the tunnel.

One WLAN mobility set (hereinafter referred to as a mobility set for convenience of description) represents one or more WLAN APs included in one set identified by one or more BSSID / HESSID / SSIDs (A WLAN mobility set is a set of one or more WLAN APs identified by one or more BSSID / HESSID / SSIDs). While the terminal is configured with a bearer using a WLAN carrier, a WLAN mobility mechanism is applied within the WLAN mobility set. That is, the mobile station can perform the mobility operation between the WLAN APs belonging to the mobility set without informing the base station.

4 is a diagram for explaining a tunneling-based WLAN carrier addition procedure according to an embodiment.

Referring to FIG. 4, a base station 402 configures a WLAN measurement at a terminal 400. To this end, the base station 402 may transmit the measurement configuration information necessary for the terminal 400 to measure the WLAN carrier to the terminal 400 by including it in the RRC connection reconfiguration message (S400).

The UE 400 applies the measurement configuration information and transmits a RRC Connection Reconfiguration Completion message to the BS 402 (S410).

The terminal 400 may acquire the WLAN information (S420). For example, the UE can obtain one or more of the WLAN association status, the WLAN identifier (BSSID / HESSID / SSID), the MAC address, and the IP address by measuring the WLAN according to the measurement configuration information described above.

The terminal 400 may transmit the measurement result through the measurement report to the base station 402 through the measurement report (S430). The measurement report may include information such as the connection state of each WLAN and the connection quality state of the WLAN carrier measured by the terminal 400 according to the measurement configuration information.

The base station 402 decides to allocate a WLAN carrier to a specific E-RABs, and transmits an RRC connection reconfiguration message including the new radio resource configuration information to the terminal 400 (S440). The new radio resource configuration information may be determined using the measurement report information transmitted by the terminal 400 in step S430.

The terminal 400 configures / applies the configuration information for using the WLAN carrier to the terminal 400 based on the RRC connection reconfiguration message. That is, the terminal 400 can configure the IPsec tunnel through the WLAN carrier using the configuration information received from the base station 402, and set the data bearer using the IPsec tunnel.

For example, the configuration information for the WLAN carrier 400 to use the WLAN carrier includes WLAN cell / band / carrier / frequency / radio link configuration information (hereinafter referred to as WLAN cell configuration information for convenience of explanation) And a WLAN tunnel bearer / WLAN bearer / Switched bearer (denoted by a tunnel bearer for convenience of explanation) using the IPsec tunnel.

WLAN cell configuration information includes WLAN cell identifier information, WLAN mobility set identifier information, band / frequency information, WLAN identification information (BSSID / HESSID / SSIDs) And information for instructing a cell WLAN primary cell to perform data transmission via the WLAN among the WLAN cells. The UE can perform connection authentication through the corresponding cell through the information for indicating the WLAN connection authentication cell or the information indicating the cell in which the WLAN data transmission is to be performed.

The tunnel bearer configuration information is common information for tunnel bearers. The tunnel bearer configuration information includes an IP address for establishing an IPsec tunnel between the UE and the base station through the WLAN carrier, eps-bearer identification information (eps-bearer identification) Information, tunnel identification information (or DRB identification information) of the base station, and tunnel identification information of the terminal. Here, the IP (Internet Protocol) address information for the IPsec tunnel indicates the base station IP address information or the gateway IP address information connected to the base station.

The MS 400 applies a new radio resource configuration and transmits an RRC connection reconfiguration message to the BS 402 (S450).

In the following description, the term "user plane data" means "user plane data". As described with reference to FIGS. 1 to 3, the terminal 400 receives the configuration information in step S440, configures the IPsec tunnel, and sets the data bearer using the IPsec tunnel. Hereinafter, an operation of the terminal to configure the IPsec tunnel using the configuration information and to set up the data bearer will be described in more detail.

In accordance with the RRCConnectionReconfiguration message received in step S440, the terminal 400 applies a new radio resource configuration.

As an example of the terminal 400 configuring the radio resources, the terminal 400 may perform the WLAN access authentication until the data transmission is possible through the WLAN carrier (for example, by steps S460, S462, S470, The tunnel entity can be configured to be deactivated (deactivate or suspend or disable) until the steps S460, S462, and S470 are succeeded). Specifically, the terminal 400 generates / configures a tunnel entity according to a new radio resource configuration, and can configure the tunnel entity to be in an inactive state. When the tunnel entity is deactivated, downlink or uplink data transmission over the WLAN carrier is deactivated.

Base station 402 may be aware of the success or failure of WLAN access authentication and / or tunnel setup. The base station 402 knows the success or failure of the WLAN connection authentication and / or tunnel setup with the terminal 400, or receives the success or failure information of the WLAN connection authentication and / or tunnel setup from the terminal 400 You may know this.

The base station 402 may activate or resume or enable the deactivated bearer when the WLAN access authentication and / or tunnel setup is successful. The base station 402 may transmit indication information to the terminal 400 to activate the deactivated bearer. For example, until the tunnel bearer is deactivated, data is transmitted and received through the E-UTRAN bearer, and the base station 402 can then use the E-UTRAN bearer as a tunnel bearer through the RRCConnectionReconfiguration message.

In accordance with the RRCConnectionReconfiguration message received in S440, another example in which the UE applies a new radio configuration is as follows. The UE may include WLAN cell configuration information as configuration information for using WLAN radio resources. In addition, the terminal may include information for instructing the WLAN access authentication with the configuration information for using the WLAN radio resource. The WLAN cell configuration information may include one or more of WLAN cell identifier information, WLAN mobility set identifier information, band / frequency information, and WLAN identification information (BSSID / HESSID / SSIDs). For a cell to perform WLAN access authentication among the WLAN cells, information for instructing WLAN connection authentication in the corresponding cell may be included. (Or may include information for indicating which of the WLAN cells to perform data transmission over the WLAN (WLAN primary cell)).

When the UE receives the information for indicating the WLAN connection authentication cell or the cell indicating the cell to which the WLAN data is to be transmitted, the UE can perform connection authentication through the corresponding cell as in step 7. (Alternatively, the base station may transmit a MAC CE to allow the terminal to attempt access authentication to the WLAN access authentication cell, and may perform access authentication to the WLAN access authentication cell when the terminal receives this MAC CE.)

The base station can confirm the successful authentication of the WLAN connection in step 7 (or the base station can confirm the success of the WLAN connection authentication of the terminal by receiving the WLAN connection authentication success information from the terminal).

After confirming that the base station has successfully authenticated the WLAN connection, the base station sends an RRCConenceReconfiguration message including the tunnel bearer configuration to the UE. The terminal constructs a tunnel bearer according to step 8. The UE configures the tunnel bearer according to step 8, and then responds to the RRCConnectionReconfigurationComplete message.

In another example, after the base station confirms the success of the WLAN connection authentication, the base station sends an RRCConenceReconfiguration message including the tunnel bearer configuration to the terminal. The terminal applies the new configuration and responds to the RRCConnectionReconfigurationComplete message. The terminal sets up the tunnel according to step 8. If a problem occurs on the WLAN radio link in the tunnel setup process, the UE can inform the BS through the RRC message.

As another example in which the terminal 400 configures radio resources, the terminal 400 may include WLAN cell configuration information as configuration information for using the WLAN carrier. The WLAN cell configuration information may include one or more of WLAN cell identifier information, WLAN mobility set identifier information, band / frequency information, and WLAN identification information (BSSID / HESSID / SSIDs). For a cell to perform WLAN access authentication among the WLAN cells, information for instructing WLAN connection authentication in the corresponding cell may be included. Or information for indicating a cell (WLAN primary cell) to perform data transmission via the WLAN among the WLAN cells. Or configuration information (e.g., key value, security association / negotiation information, encryption / decryption information) for configuring a tunnel (IPsec tunnel) through the WLAN, information indicating that the terminal 400 instructs the WLAN connection authentication with the configuration information for using the WLAN carrier Algorithm, an authentication method (a parameter for an IKE authentication procedure), etc.).

When the terminal 400 receives the information for indicating the WLAN access authentication cell or the information for indicating the cell to which the WLAN data is to be transmitted, the terminal 400 can perform connection authentication through the corresponding cell as in steps S460 and S462. In addition, the base station 402 can transmit a MAC CE for allowing the terminal 400 to attempt connection authentication to the WLAN access authentication cell, and when the terminal 400 receives the MAC CE, Can be performed.

The terminal 400 sets up an IPsec tunnel through the WLAN carrier with the base station 402 (S470). The key value, the security association / negotiation information, the encryption algorithm, the authentication method (the parameter for the IKE authentication procedure), and the like are included in the RRC message through the Uu interface between the terminal 400 and the base station 402 during the IPsec tunnel setup through the WLAN carrier And can be transmitted and received. Or security association / negotiation information, an encryption algorithm, an authentication method (a parameter for the IKE authentication procedure), and the like may be transmitted and received through a path through the WLAN carrier during the setup process through the WLAN carrier.

If the IPsec tunnel setup is successful according to steps S460 and S462, the BS 402 can transmit an RRCConnectionReconfiguration message including the tunnel bearer configuration to the MS 400. [ The tunnel bearer configuration information includes at least one of eps-bearer identity, eps-bearer identity, IPSEC tunnel configuration information (e.g., IPsec header encapsulation / decapsulation, IPsec security association, Entity), security information, tunnel endpoint identification information of the base station (or DRB identification information), and tunnel endpoint identification information of the terminal. The UE 400 configures a tunnel bearer and then transmits an RRC connection reconfiguration completion message to the BS 402.

For example, the E-UTRAN bearer can transmit and receive data through the E-UTRAN bearer until the tunnel bearer is configured, and then the E-UTRAN bearer can be used as the tunnel bearer through the RRCConnectionReconfiguration message.

As another example of the terminal 400 configuring the radio resources, the terminal 400 configures the terminal 400 with configuration information for using the WLAN carrier. The configuration information for the terminal 400 to use the WLAN carrier may include a WLAN cell, a WLAN tunnel bearer using an IPsec tunnel through WLAN cells (hereinafter referred to as a tunnel bearer for convenience of explanation) configuration information. Or the configuration information may include E-UTRAN bearer configuration information associated with the tunnel bearer. WLAN has lower coverage than E-UTRAN and radio resource control is difficult. Therefore, when there is a problem on the WLAN radio link, the base station 402 includes E-UTRAN bearer configuration information (DRB-ToAddMod) using the E-UTRAN cell in connection with the tunnel bearer So that the terminal 400 can be configured. The UE 400 transmits the eNodeB message to the tunnel bearer using one of the eps Bearer Identification (eps-Bearer Identification), the DRB Identity (drb-Identity), or the instruction information indicating the bearer associated with the tunnel bearer It is possible to distinguish between bearers.

For example, the terminal 400 may continue to transmit data on the WLAN carrier until it is able to transmit data over the WLAN carrier (e.g., up to steps S460, S462, or S470, or after the timer expires, Until it succeeds in step S470), it may transmit or receive data via the E-UTRAN bearer associated with the tunnel bearer. The UE 400 may deactivate the E-UTRAN bearer when data transmission via the WLAN carrier is enabled after WLAN authentication. When deactivating the E-UTRAN bearer, the RLC entity and the PDCP entity can be reset.

As another example, the terminal 400 may send an E-UTRAN bearer (or bearer RLC / PDCP entity) associated with the tunnel bearer until it detects a failure on the WLAN radio link and / or until the terminal releases the tunnel bearer. It can be disabled. If the terminal 400 detects a failure on the WLAN radio link, the terminal 400 may activate the E-UTRAN bearer associated with the tunnel bearer.

The above-described failure on the WLAN radio link indicates that the WLAN radio link quality (e.g., beacon RSSI, channel utilization, backhaul rate, WLAN signal strength) is lower than a certain threshold, Or the feedback for the WLAN transmission is not received for a certain period of time, the loss of a certain number or more in the feedback for the WLAN transmission, the failure of the WLAN access authentication, the failure of the WLAN access authentication ≪ / RTI > and one or more of failing over time.

As described above, the terminal 400 can receive the configuration information from the base station, configure the IPsec tunnel, and set the data bearer. To this end, the terminal 400 performs a WLAN connection. For example, the terminal 400 performs a WLAN association. As another example, the terminal performs WLAN access authentication with the WLAN node 401 (WLAN AP / AC / Termination) (S460). The WLAN node 401 performs authentication and authorization with the AAA / HSS 403 (S462).

Meanwhile, an IKE (Internet Key Exchange) tunnel establishment procedure can be started by the terminal 400. The IP address of the base station 402 required for the terminal 400 to set up the IPsec tunnel may be included in the RRCConnationReconfiguration message in step S440.

For example, the IP address of the base station 402 may be resolved using a DNS (domain name server). This allows you to assign an IP address that allows only self-routing within the internal network. The base station 402 may configure the terminal 400 to resolve the IP address of the base station 402 through a RRC message.

Through the above-described series of processes, the terminal 400 and the base station 402 set up an IPsec tunnel through the WLAN carrier (S470).

Terminal IP allocation and change procedure

Hereinafter, various embodiments of the WLAN access authentication and the IP address allocation procedure for tunnel establishment performed in steps S460 and S462 will be described.

The terminal performs WLAN access authentication with the WLAN node (WLAN AP / AC / Termination).

This can be done through the access authentication procedure between the terminal defined in the 3GPP TS 33.402 document and the 3GPP core network entity (AAA / HSS or 3GPP AAA proxy)

The AAA / HSS and / or the 3GPP AAA Proxy may include an IP address (or an IPv6 Prefix, which is assigned by the WLAN node for successful authentication, hereinafter referred to as an IP address for convenience of description, It can be used to enforce the use of. After authentication, the terminal is configured with the (assigned) IP address from the WLAN node. This IP address is used as a source address when sending a message for establishing an IPsec tunnel with the terminal or on the outer header of the IPsec tunnel between the terminal and the base station.

In order to set up the IPsec tunnel through the WLAN, the terminal and the base station must make the base station know the IP address of the terminal.

For example, when a core network entity including a AAA / HSS or 3GPP AAA Proxy or a 3GPP core network entity (MME, PGW) or a DHCP server function allocates / updates / releases a terminal IP address, The IP address of the terminal to be updated / released can be transmitted to the base station. For example, core network control signaling can be used to deliver this through S1 signaling through the MME. For another example, signaling may be configured between a core network entity and a base station, including AAA / HSS or 3GPP AAA Proxy or 3GPP Core Network Entities (MME, PGW) or DHCP server functions, to deliver signaling.

As another example, when the terminal receives the IP address from the WLAN node according to the radio resource configuration information of the base station as in step S440, the terminal transmits the IP address of the terminal allocated from the WLAN node through the interface (Uu) RRC message (e.g., a WLAN status / information message) to the base station. In addition, when the terminal is unassociated from the WLAN node and the IP address is released, the terminal can be informed to the base station. Depending on one or more of the causes of, for example, the release of the WLAN cell of the base station, the release of the tunnel bearer associated with the WLAN cell, the release of the WLAN mobility set, the change of the WLAN mobility set, the change of the base station and the tunnel bearer associated with the WLAN cell, / WLAN association / Tunnel configuration is canceled / modified / changed, the IP address can be released / corrected / changed to the base station. Alternatively, the terminal may transmit the IP address of the terminal allocated from the WLAN node to the base station through the interface (Uu) between the terminal and the base station.

When the base station IP address  How to handle assignments

As another example, a WLAN access authentication procedure between the terminal and the base station can be performed. The base station may enforce the use of the IP address (or IPv6 Prefix) assigned at the WLAN node for successful authentication. For example, if the terminal requests an IP address (or an IPv6 prefix) through a DHCP protocol or the like, the WLAN node requests an IP address (or an IPv6 prefix) together with an authentication and authorization message to the base station. In order for the WLAN node to perform the IP address allocation through the base station of the terminal, the terminal may transmit information to the WLAN node including information (e.g., DHCP option information, option 82 or an additional field) for indicating this. For example, the information for instructing the WLAN node to perform the assignment of the IP address of the terminal through the base station may be included in the RRCConnationReconfiguration message in step S440 and may be provided to the terminal.

According to the information (for example, one or more of WLAN node identification information, candidate IP address (or IPv6 prefix), and version information) on the authentication and authorization message requested by the WLAN node to the base station, Address (or IPv6 Prefix) and provide it to the WLAN node. The WLAN node may then provide the corresponding IP address (or IPv6 Prefix) to the terminal. After authentication, the terminal is configured with the IP address assigned from the WLAN node. This IP address is used as a source address when sending a message for establishing an IPsec tunnel with the terminal or on the outer header of the IPsec tunnel between the terminal and the base station. Thus, the base station can identify the corresponding terminal.

IPsec  Data discrimination based on tunnel use

A tunnel (for example, an IPsec tunnel) is created in the terminal and the base station in order to transmit data between the terminal and the base station through the WLAN to the RRC-connected terminal without updating the existing WLAN AP. For example, an IPsec tunnel is configured between a terminal and a base station, and can be configured through a WLAN carrier. As another example, an IPsec tunnel is configured between a terminal and a gateway connected to a base station, and can be configured through a WLAN carrier.

Since the IPsec tunnel encapsulates and transmits IP packets between two nodes constituting the tunnel, it may be difficult to distinguish the bearers provided by the E-UTRAN and to perform the QoS processing accordingly. The following embodiment can be used as a method for solving this problem.

1st Example : wireless Bearer star Tunnel entity  Configuration

A tunnel entity configured for each bearer within the terminal and the base station can be configured. That is, the base station can make the bearer-specific tunnel entity be configured in the terminal.

For example, a tunnel entity configured by a bearer is divided into core network interface bearers (eps bearers) and submits data bearer discrimination information to IP packets received from the IPsec layer, The bearer classification information can be removed and transferred to the upper layer (for example, NAS, eps bearer). In another example, the tunnel entities configured by bearer include encapsulation / decapsulation of the IPsec header, data received via the WLAN carrier to an upper layer (e.g. NAS or eps bearer), data received from the upper layer To a lower layer (WLAN MAC) to transmit via a WLAN carrier.

Specifically, the tunnel entity may add information that can distinguish the bearer to the field on the IPsec header. For example, additional headers or information that can distinguish a bearer over an existing IPsec header can be included.

Alternatively, the tunnel entity may include information that can identify the bearer in the inner field of the IPsec header. For example, a new field may be added to the innermost part of the IPsec payload so as to include information that can distinguish the bearer. As another example, information that can distinguish a bearer from an IP packet is added and transmitted through the IPsec tunnel. Or subordinate (submitting to the WLAN MAC via IPsec instance or IPsec).

Alternatively, the tunnel entity may include information that can identify the bearer in the IPsec header outer field.

The information for distinguishing the bearer may be one of eps-BearerIdentity, DRB-identity, and logical channel identification information.

The UE transmits an eps-bearer identity (eps-bearer identity), DRB-identity (DRB-identity) or logical channel identification information for each tunnel bearer included in the tunnel bearer configuration information included in the RRC message received from the base station For example, NAS) can be submitted to the corresponding tunnel entity. Or the data received via the WLAN carrier and forwarded to the corresponding tunnel entity to the higher layer bearer. The tunnel bearer configuration information included in the RRC message includes eps bearer identification information, DRB identification information (drb-Identity), logical channel identification information, tunnel entity configuration information, security information, tunnel endpoint identification information of the base station And tunnel endpoint identification information of the terminal.

Second Example : IPsec  tunnel In the instance Radio bearer  Configure to distinguish

An IPsec tunnel (or an IPsec tunnel instance for this purpose) (hereinafter referred to as an IPsec tunnel instance) configured to be terminal specific within a terminal and a base station includes encapsulation / decapsulation of an IPsec header, data received through a WLAN carrier, (NAS or eps bearer) and submitting the data received from the upper layer to the lower layer (WLAN MAC) to transmit via the WLAN carrier.

For example, it is possible to add bearer identification information to IP packets received separately by IPsec tunnel instance core network interface bearer (eps bearer) and to submit them to a lower layer (WLAN MAC) (E. G., NAS, eps bearer). ≪ / RTI > The IPsec tunnel instance multiplexes the data (IP packet) received by the core network interface bearer in the upper layer and submits it to the lower layer (WLAN MAC). The IPsec tunnel instance may be configured to add bearer identification information to data (IP packet) received by the core network interface bearer in an upper layer. The IPsec tunnel instance can demultiplex the data transferred from the lower layer (WLAN MAC) and forward it to the upper layer. The IPsec tunnel instance can forward the data from the lower layer based on the bearer-specific information to the associated upper layer bearer in the IP packet to which the bearer-specific information is added.

Third Example : IPsec  tunnel Instance  On top By radio bearer  Entity configuration or IPsec tunnel Instance  In the upper part, Tunnel entity  Configuration

The IPsec tunnel instance configured to be terminal-specific within the terminal and the base station includes encapsulation / decapsulation of the IPsec header, transmission of data received through the WLAN to an upper layer (for example, upper tunnel entity) To the lower layer (WLAN MAC) so as to transmit the data received from the upper tunnel entity (e.g., upper tunnel entity) through the WLAN carrier.

For example, the upper tunnel entity may be configured for each radio bearer. The upper tunnel entity may add DRB-identity (DRB-identity).

In another example, the upper tunnel entity may be configured to be terminal specific. The upper tunnel entity may add DRB-identity (DRB-identity). The upper tunnel entity can perform multiplexing and demultiplexing for each radio bearer. That is, DRB-identity or eps-bearer identity or logical channel identifier is added to the user data of the upper layer (NAS, epsivar bearer) eps bearer to use the WLAN radio resource through the IPsec tunnel Data can be transmitted. Then, DRB-identity, eps-bearer identity, or logical channel identifier is removed from the data received using the WLAN radio resource and delivered by the IPsec tunnel, and the DRB-ID or eps-bearer identity is transferred to the corresponding upper layer eps bearer .

On the other hand, according to the movement of the terminal, a change in the WLAN mobility set or a WLAN cell release occurs. At this time, it is possible to configure the tunnel entity in the upper part of the IPsec tunnel instance as a method for reducing data interruption or loss of the tunnel bearer for transmitting and receiving data through the IPsec tunnel using the WLAN carrier. For example, it is possible to confirm the data successfully transmitted or the lost data information through the tunnel entity above the IPsec tunnel.

As described above, according to the present embodiment, it is possible to provide a tunnel-based LTE-WLAN aggregation / integration capable of reusing existing WLAN APs. In addition, it is possible to provide a data classification process for each radio bearer by providing a terminal IP allocation and changing procedure associated with the WLAN tunnel setting and a method of controlling data separately on the tunnel.

A configuration of a terminal and a base station capable of performing all the operations of the embodiments described with reference to Figs. 1 to 4 will be described with reference to the drawings.

5 is a diagram for explaining a terminal configuration according to an embodiment.

5, the terminal 500 includes a receiver 530 for receiving configuration information for transmitting / receiving data to / from a base station using an Internet Protocol Security (IPsec) tunnel through a WLAN (wireless local area network) carrier, A control unit 510 for configuring an IPsec tunnel based on an IPsec tunnel, and a transmitter 520 for transmitting data received from an upper layer in a tunnel entity in the terminal to a base station using an IPsec tunnel do.

The control unit 510 may configure the IPsec tunnel so that the terminal and the base station transmit and receive data by adding the WLAN carrier without changing the existing WLAN node. An IPsec tunnel is configured between a terminal and a base station, and can be configured through a WLAN carrier.

Also, the control unit 510 can set a data bearer for transmitting / receiving data to / from the base station through the configured IPsec tunnel. The control unit 510 may also configure a tunnel entity for distinguishing a radio bearer with respect to data transmitted and received through the IPsec tunnel. The tunnel entity may transmit the bearer identification information to the data received from the upper layer to the lower layer and remove the bearer identification information from the data received from the lower layer, and may transmit the bearer identification information to the upper layer.

The receiving unit 530 receives the configuration information from the base station to configure the IPsec tunnel. For example, the configuration information may include at least one of WLAN identification information, Internet Protocol (IP) address information for the IPsec tunnel, Internet Key Exchange (IKE) configuration information, and data bearer identification information. As another example, the configuration information may include WLAN cell configuration information. The WLAN cell configuration information may include one or more of WLAN cell identifier information, WLAN mobility set identifier information and band / frequency information, and WLAN identification information (e.g., BSSID / HESSID / SSIDs). For a cell to perform WLAN access authentication among the WLAN cells, information for instructing WLAN connection authentication in the corresponding cell may be included. As another example, the configuration information may include information that instructs the terminal to perform WLAN connection authentication with configuration information for using the WLAN carrier. In addition, the configuration information may include information necessary for the terminal and the base station to construct the IPsec tunnel through the WLAN carrier. The receiving unit 530 may receive the configuration information through the RRC connection reconfiguration message.

In addition, the receiver 530 receives downlink control information, data, and messages from the base station through the corresponding channel.

In addition, the controller 510 controls the entire terminal 500 to provide a terminal IP allocation and change procedure associated with the IPsec tunnel configuration necessary for performing the above-described embodiments, .

The transmitter 520 transmits uplink control information, data, and a message to the base station through the corresponding channel. In addition, data is transmitted through the IPsec tunnel.

6 is a view for explaining a base station configuration according to an embodiment.

6, the base station 600 includes a transmitter 620 that transmits configuration information for transmitting / receiving data to / from a terminal using an IPsec (Internet Protocol Security) tunnel through a WLAN (wireless local area network) carrier, And a controller 610 for transmitting the data received through the IPsec tunnel in the tunnel entity in the base station to the upper layer.

The transmitter 620 may transmit the configuration information to the terminal through higher layer signaling (e.g., an RRC connection reconfiguration message). For example, the configuration information may include at least one of WLAN identification information, Internet Protocol (IP) address information for the IPsec tunnel, Internet Key Exchange (IKE) configuration information, and data bearer identification information. As another example, the configuration information may include WLAN cell configuration information. The WLAN cell configuration information may include one or more of WLAN cell identifier information, WLAN mobility set identifier information and band / frequency information, and WLAN identification information (e.g., BSSID / HESSID / SSIDs). For a cell to perform WLAN access authentication among the WLAN cells, information for instructing WLAN connection authentication in the corresponding cell may be included. As another example, the configuration information may include information that instructs the terminal to perform WLAN connection authentication with configuration information for using the WLAN carrier. In addition, the configuration information may include information necessary for the terminal and the base station to construct the IPsec tunnel through the WLAN carrier.

The receiving unit 630 can receive data received through the IPsec tunnel.

The control unit 610 configures an IPsec tunnel and can set a data bearer using the IPsec tunnel. The controller 610 may configure a tunnel entity and control the tunnel entity to transmit the data received from the upper layer to the lower layer by adding bearer identification information. Alternatively, the control unit 610 may control the tunnel entity to remove the bearer identification information from the data received in the lower layer and to transmit the removed bearer identification information to the upper layer. In addition, the control unit 610 provides a terminal IP allocation and change procedure associated with the WLAN tunnel configuration necessary for performing the above-described embodiments, and a method of distinguishing and controlling data on the tunnel, And controls the operation.

The transmitting unit 620 and the receiving unit 630 are used to transmit and receive signals, messages, and data necessary for carrying out the present invention to and from the terminal.

The standard content or standard documents referred to in the above-mentioned embodiments constitute a part of this specification, for the sake of simplicity of description of the specification. Therefore, it is to be understood that the content of the above standard content and portions of the standard documents are added to or contained in the scope of the present invention.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (20)

A method for a terminal to transmit and receive data,
Receiving configuration information for transmitting and receiving data with a base station using an Internet Protocol Security (IPsec) tunnel through a WLAN (wireless local area network) carrier;
Configuring the IPsec tunnel based on the configuration information and setting a data bearer using the IPsec tunnel; And
And transmitting data received from an upper layer in a tunnel entity in the terminal to the base station using the IPsec tunnel. The method according to claim 1,
The configuration information includes:
(WLAN) identification information, Internet Protocol (IP) address information for the IPsec tunnel, Internet Key Exchange (IKE) configuration information, and data bearer identification information. The method according to claim 1,
The tunnel entity comprises:
(SDU) for each core network interface bearer received from the upper layer, and adds the bearer identification information to the lower layer. The method of claim 3,
The bearer identification information may include,
Data radio bearer identification information (DRB-Identity). The method according to claim 1,
The tunnel entity comprises:
Removing bearer identification information from a PDU (Protocol Data Unit) received through the IPsec tunnel from a peer tunnel entity configured in the base station, and forwarding the bearer identification information to the upper layer. The method according to claim 1,
The tunnel entity comprises:
Wherein the terminal is configured to be terminal specific. The method according to claim 1,
The tunnel entity comprises:
And encapsulating and decapsulating data transmitted and received through the IPsec tunnel. A method for a base station to transmit and receive data,
Transmitting configuration information for transmitting and receiving data with a terminal using an IPsec (Internet Protocol Security) tunnel through a WLAN (wireless local area network) carrier;
Receiving data using the IPsec tunnel; And
And forwarding the data received by the tunnel entity in the base station to the upper layer using the IPsec tunnel. 9. The method of claim 8,
The tunnel entity comprises:
And removing bearer identification information from a protocol data unit (PDU) received through the IPsec tunnel and forwarding the bearer identification information to the upper layer. 10. The method of claim 9,
The bearer identification information may include,
Data radio bearer identification information (DRB-Identity). A terminal for transmitting and receiving data,
A receiving unit for receiving configuration information for transmitting and receiving data to / from a base station using an IPsec (Internet Protocol Security) tunnel through a WLAN (wireless local area network) carrier;
A controller for configuring the IPsec tunnel based on the configuration information and setting a data bearer using the IPsec tunnel; And
And a transmitter for transmitting data received from a higher layer in a tunnel entity in the terminal to the base station using the IPsec tunnel. 12. The method of claim 11,
The configuration information includes:
A WLAN identification information, an IP (Internet Protocol) address information for the IPsec tunnel, an IKE (Internet Key Exchange) configuration information, and a data bearer identification information. 12. The method of claim 11,
The tunnel entity comprises:
A service data unit (SDU) for each core network interface bearer received from the upper layer, and adds the bearer identification information to the lower layer. 14. The method of claim 13,
The bearer identification information may include,
Data radio bearer identification information (DRB-Identity). 12. The method of claim 11,
The tunnel entity comprises:
Removes bearer identification information from a PDU (Protocol Data Unit) received through the IPsec tunnel from a peer tunnel entity configured in the base station, and delivers the removed bearer identification information to the upper layer. 12. The method of claim 11,
The tunnel entity comprises:
Wherein the terminal is configured to be terminal-specific. 12. The method of claim 11,
The tunnel entity comprises:
And encapsulates and decapsulates data transmitted and received through the IPsec tunnel. A base station for transmitting and receiving data,
A transmission unit configured to transmit configuration information for transmitting and receiving data to and from a terminal using an IPsec (Internet Protocol Security) tunnel through a WLAN (wireless local area network) carrier;
A receiver for receiving data using the IPsec tunnel; And
And a controller for transmitting data received by the tunnel entity in the base station to the upper layer using the IPsec tunnel. 19. The method of claim 18,
The tunnel entity comprises:
And removing the bearer identification information from a PDU (Protocol Data Unit) received through the IPsec tunnel and delivering the bearer identification information to the upper layer. 20. The method of claim 19,
The bearer identification information may include,
Data radio bearer identification information (DRB-Identity).

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