KR20190074614A - Traffic transmission system based on dynamic tunneling communication, and signaling method of the same - Google Patents

Abstract

The present invention relates to a traffic transmission system based on a dynamic tunneling communication and a signaling method of the same. The present invention relates to a terminal, which generates one or more transmission paths through multiple communication interfaces accessing a plurality of communication networks, and a method to allow a policy server to perform signaling with the terminal and a gateway for a traffic transmission of the gateway which transmits/receives session data through one or more transmission paths connected to the terminal. According to the present invention, the method comprises: a step of transmitting a service filtering setting request signal including a designated transmission path for a specific service/application of the terminal; a step of receiving a service filtering setting response signal including an approval for the service filtering setting request signal from the gateway; and a step of transmitting a negotiation completion signal generated based on the service filtering setting response signal to the terminal. The gateway, which has received the service filtering setting request signal, and the terminal, which has received the negotiation completion signal, transmit and receive traffic for the specific service/application by using a communication network coming under the designated transmission path from among the plurality of communication networks. The present invention aims to provide the traffic transmission system based on the dynamic tunneling communication and signaling method of the same, which are able to vary the number of tunnels generated in a transmission path dynamically.

Description

TECHNICAL FIELD [0001] The present invention relates to a dynamic tunneling-based traffic transmission system, and a signaling method thereof. [0002]

The present invention relates to a signaling method for dynamic tunneling-based traffic transmission.

In general, a mobile communication terminal is designed to use one access network at a certain point, and a special purpose transmission protocol such as Multi-Path Transmission Control Protocol (MPTCP) You can connect simultaneously.

The MPTCP-based multi-network transmission technology divides traffic generated by application programs and services operating in the foreground or background in a session unit and performs socket communication. Therefore, the MPTCP based multi-network transmission technology can not use the protocol other than TCP, such as UDP (User Datagram Protocol).

When a TCP session is created and socket communication is established, a routing policy creates a subflow through one or more access networks. However, according to the MPTCP based multi-network transmission technology, the mobile communication terminal unconditionally accesses a plurality of networks regardless of the size or type of data. Therefore, although the transmission conditions such as the rate plan and the energy efficiency according to the amount of data transmission vary depending on the access network, the prior art has a limitation in that it can not determine the transmission path only by using the multi-network unconditionally regardless of the service / application. In particular, data transmitted on a path with low security is likely to be sniffed, and even if the encryption / decryption logic is applied, efficiency may be reduced because it is applied to a plurality of transmission paths.

Tunneling communication is a technology used for VPN (Virtual Private Network). A VPN generally connects to one network to create a tunnel. However, a plurality of tunnels created in a plurality of networks may be grouped and processed in parallel. For example, if the communication line speed between corporate headquarters and branch office is low, the line speed can be improved by bundling several low-speed lines. However, there is an overhead that must occupy circuits for tunneling communication and always connect tunnels regardless of data transmission.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a method and apparatus for transmitting session data through one or more paths (transmission networks) The present invention provides a traffic transmission system that determines the above path and dynamically changes the number of tunnels generated in the transmission path, and a signaling method thereof.

According to one embodiment, traffic transmission between a terminal that generates at least one transmission path through a plurality of communication interfaces connecting to a plurality of communication networks, and a gateway that transmits and receives session data through at least one transmission path connected to the terminal, A method for signaling a policy server with a terminal and a gateway, the method comprising: transmitting a service filtering configuration request signal including a transmission path designated for a specific service / application of the terminal to the gateway; Receiving a service filtering setting response signal including an acceptance of the request signal, and transmitting a negotiation completion signal generated based on the service filtering setting response signal to the terminal. The gateway receiving the service filtering setting request signal and the terminal receiving the negotiation completion signal transmit and receive traffic for the specific service / application using the communication network corresponding to the designated transmission path among the plurality of communication networks.

The transmitting of the service filtering setting request signal includes receiving a service filtering request signal including a service-interface mapping list from the terminal, generating the service filtering setting request signal based on the service-interface mapping list, Lt; / RTI > The negotiation completion signal is a service filtering response signal that is a response to the service filtering request signal, and the service-interface mapping list may include information on which the specific service / application and the designated transmission path are mapped.

The step of transmitting the negotiation completion signal may transmit the service-interface mapping list in which the specific service / application and the designated transmission path are mapped to the terminal.

The signaling method further includes receiving a service filtering setting response signal including a rejection of the service filtering setting request signal from the gateway, and transmitting the modified service filtering setting request signal to the gateway to renegotiate .

According to another embodiment, there is provided a method of transmitting traffic between a terminal that generates at least one transmission path through a plurality of communication interfaces connecting to a plurality of communication networks, and a gateway that transmits and receives session data through at least one transmission path connected to the terminal A method of signaling a policy server with a terminal and a gateway, the method comprising: transmitting a control registration request signal including a transmission path dynamic control condition for the terminal to the gateway; receiving, from the gateway, And transmitting a negotiation completion signal generated based on the control registration response signal to the terminal. Wherein the transmission path control condition includes a service name of a control object, a transmission path or a session holding time required for adding a tunnel, and a communication interface in which an additional transmission path or an additional tunnel is generated, Upon receiving the negotiation completion signal from the gateway, the terminal generates the additional transmission path or the additional tunnel and merges and transmits the traffic of the session when the session corresponding to the service name continues for the session holding time.

According to another embodiment, there is provided a method of transmitting traffic between a terminal that generates at least one transmission path through a plurality of communication interfaces connecting to a plurality of communication networks, and a gateway that transmits and receives session data through at least one transmission path connected to the terminal A method for signaling a policy server with a terminal and a gateway, the method comprising: receiving a tunnel request signal including a tunnel control condition from the terminal; transmitting a tunnel generation request signal including the tunnel control condition to the gateway Receiving a tunnel generation response signal including an acceptance of the tunnel generation request signal from the gateway and transmitting a tunnel response signal generated based on the tunnel generation response signal to the terminal, . The tunnel control condition includes a number of generated tunnels for each transmission path, and the gateway receiving the tunnel request signal and the terminal receiving the tunnel response signal generate the number of tunnels per transmission path according to the tunnel control condition.

The tunnel control condition may further include whether or not the tunnel data is encrypted.

Wherein the signaling method further comprises receiving an authentication key for encryption and decryption from the terminal and transmitting a user registration request signal including the authentication key to the gateway, It can be used for data encryption and decryption.

The signaling method comprises the steps of: determining an increase or a decrease in the number of tunnels generated in a specific transmission path based on state information of the terminal and the gateway; and transmitting a tunnel request signal including an increase or decrease in the determined number of tunnels, To the mobile station. The terminal may add a tunnel connected to the gateway or remove a connected tunnel according to the tunnel request signal.

According to another embodiment, there is provided a method of transmitting traffic between a terminal that generates at least one transmission path through a plurality of communication interfaces connecting to a plurality of communication networks, and a gateway that transmits and receives session data through at least one transmission path connected to the terminal A method for signaling a policy server with a terminal and a gateway, the method comprising: receiving a health check request signal for a transmission path from the terminal; transmitting a health check notification signal requested by the terminal to the gateway; And transmitting a health check response signal for the health check request signal to the terminal. The terminal receiving the health check response signal and the gateway can exchange a hello message through the at least one transmission path.

The health check request signal may include a transmission path and a check interval as a health check target.

According to another embodiment of the present invention, there is provided an operation method of a terminal that performs traffic transmission / reception with a gateway through at least one of multiple communication interfaces connecting to a plurality of communication networks, the method comprising: Receiving a response from the policy server, the response including a service filtering acceptance of the gateway to the service-interface mapping list; and transmitting, by the policy server, And sending and receiving session data of the specific service / application to the gateway through a communication interface.

The method comprising the steps of: transmitting a tunnel control condition including a number of generated tunnels for each transmission path to the policy server; receiving a response including control acceptance of the gateway from the policy server to the tunnel control condition; The method comprising the steps of: The step of transmitting / receiving the session data to / from the gateway may generate at least one tunnel in the specific transmission path based on the number of generated tunnels for each transmission path included in the tunnel control condition, and transmit / receive the session data to / .

Wherein the step of transmitting / receiving the session data to / from the gateway includes transmitting the session data to a tunnel, which is a data encryption target, among the tunnels generated in the specific transmission path based on the tunnel control condition Data can be encrypted and transmitted to the gateway.

The method comprising: transmitting a health check request for the specific transmission path to the policy server; receiving a notification from the policy server to the gateway for the health check request; And transmitting a hello message to the gateway through a communication interface corresponding to the specific transmission path.

The method of operation of the terminal may include restricting data transmission to a communication interface corresponding to the specific transmission path when the hello message is missing or the response to the hello message is not received from the gateway, And notifying the health check failure.

According to the embodiment, session data can be transmitted by connecting to multiple networks through various transmission protocols without being limited to TCP for multi-network transmission. According to the embodiment, the session data may be transmitted through a plurality of paths regardless of a transmission protocol, or a specific one of the plurality of paths may be selectively used.

According to the embodiment, since traffic is always transmitted through at least one path among a plurality of paths according to the characteristics of a service / application without having to always transmit data through multiple paths regardless of characteristics of a service / application or a situation of the application, It is possible to prevent the session efficiency from being lowered due to simultaneous use of the network.

According to the embodiment, it is possible to increase the transmission rate performance by generating a plurality of tunnels in a transmission path even in a low performance terminal.

According to the embodiment, the data protection function can be selectively applied to each transmission path or tunnel to enhance security.

According to the embodiment, even if the traffic transmission through any access network is interrupted, the traffic can be transmitted through another available network, so that the session can be continuously maintained without interruption.

1 is a diagram illustrating a network configuration diagram according to an embodiment.
2 is a functional block diagram of a UE according to an embodiment of the present invention.
3 is a functional block diagram of a gateway according to an embodiment.
4 and 5 are flowcharts of a service filtering negotiation method for setting a transmission path for each service / application according to an exemplary embodiment.
6 is a flowchart of a service merge negotiation method for setting a dynamic transmission path for each service type according to an exemplary embodiment.
FIGS. 7 and 8 are flowcharts of a method for changing the number of tunnels per transmission path according to an embodiment.
9 is a flowchart of a transmission mode negotiation method according to an embodiment.
10 and 11 are flowcharts of a transmission path changing method for ensuring session continuity according to an embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise. Also, the terms " part, "" module," and " module ", etc. in the specification mean a unit for processing at least one function or operation and may be implemented by hardware or software or a combination of hardware and software have.

The apparatuses described in the present invention consist of hardware including at least one processor, a memory device, a communication device, and the like, and stores a program that is executed in combination with hardware at a specified location. The hardware has a configuration and performance capable of executing the method of the present invention. The program includes instructions implementing the method of operation of the invention described with reference to the drawings, and in combination with hardware such as a processor and a memory device to implement the invention.

A mobile station (MS), a mobile terminal (MT), a subscriber station (SS), a portable subscriber station (PSS), a user equipment (UE) , An access terminal (AT), and the like, and may include all or some of functions of a mobile station, a mobile terminal, a subscriber station, a mobile subscriber station, a user equipment, an access terminal, and the like.

A terminal includes a base station (BS), an access point (AP), a radio access station (RAS), a node B, an evolved NodeB (eNodeB) A Base Transceiver Station (BTS), a Mobile Multihop Relay (MMR) -BS, and the like.

The terminal may be a mobile terminal such as a smart phone, a tablet terminal such as a smart pad and a tablet PC, a communication terminal such as a computer and a television, and may have a plurality of communication interfaces. The communication interface may vary. For example, the communication interface may include a short-range wireless network interface such as WiFi / WLAN / Bluetooth and a mobile communication network interface such as 3G / Long Term Evolution (LTE) / Long Term Evolution-Advanced And the terminal manufacturer may add various communication interfaces. In this specification, the 3G / LTE interface and the WiFi interface are described as an example, but the communication interface is not limited thereto. A terminal can simultaneously access a plurality of networks at a time through a multiple communication interface.

Aggregation transmission is a technique for transmitting data using a plurality of communication networks at the same time. Through a merge transmission technique, a terminal can be connected to a plurality of communication networks at a time, and one service / application merges a plurality of networks as a single network, regardless of the number of networks or networks. Therefore, the merge transmission apparatus can quickly transmit and receive a large amount of data using a plurality of usable network resources. It can be called MultiNet Aggregation in the sense of merging a plurality of networks.

In the description, the transmission path means a path created in the network to which the terminal is connected and is described as being generated for each access network. Without being limited to this description, it is apparent that a plurality of transmission paths can be created in a single network according to the technique.

FIG. 1 is a diagram illustrating a network configuration diagram according to an embodiment, FIG. 2 is a functional block diagram of a terminal according to an embodiment, and FIG. 3 is a functional block diagram of a gateway according to an embodiment .

1, a network system 10 for providing a multi-network merging service includes a gateway 200 connected to the terminal 100 through a plurality of networks (for example, an LTE network and a WiFi network) And a policy engine (PE) 300.

The policy server 300 transmits / receives a signaling signal to / from the terminal 100 through a control channel outside the tunnel. The policy server 300 is logically linked to the gateway 200. The policy server 300 transmits and receives a signaling signal from the terminal 100 and the gateway 200 and controls dynamic tunneling-based traffic transmission between the terminal 100 and the gateway 200 based on the signaling signal.

The terminal 100 can simultaneously access a plurality of networks at one time via multiple interfaces (for example, a 3G / LTE interface and a WiFi interface).

The terminal 100 mounts an agent for tunnel communication through a plurality of paths, creates at least one tunnel in at least one access network, and transmits and receives session data through the tunnel.

Referring to FIG. 2, the AT 100 includes functional blocks of a kernel space and a user space. The kernel space includes a data link layer (Layer 2) 110, a network layer IP stack 112, and a transport layer TCP / UDP functional block 114. The user space includes an agent for tunnel communication through a plurality of paths. The agent includes an application manager 120, an interface manager 122, a session manager 124, (Path Manager) 126. The agent may also include a packet encryption and decryption functional block 128, a packet authentication functional block 130, a service flow filtering function block 132 and a tunnel manager 134 have. For example, LTE Tunnel 1 through LTE network, LTE Tunnel 2, and WiFi Tunnel 1 through WiFi network are created in at least one access network.

Each of the application manager 120, the interface manager 122, the session manager 124, the path manager 126 and the tunnel manager 134 can perform a multi-network connection management through multiple interfaces, And management of the generated tunnel in the transmission path.

The service flow filtering function block 132 filters traffic to be transmitted only to the transmission path of the service / application according to the designated service / application traffic transmission path. Accordingly, transmission paths may be different for each service / application among a plurality of transmission paths. To this end, the terminal 100, the policy server 300, and the gateway 200 may transmit an identifier (for example, a package name, an IP destination address / port, etc.) Applications and transmission paths to be subjected to service filtering can be selectively filtered through negotiation of a "service-interface mapping list" in which, for example, WiFi and LTE are mapped. I will explain in detail.

The gateway 200 transmits and receives session data through multiple networks connected to the terminal 100 to enable the terminal 100 to communicate with the content servers 400, 410, and 430 via the Internet. The gateway 200 may be called a MultiNet Aggregation-Gateway (MA-GW), but the name of the gateway may be variously assigned. The gateway 200 is located at a contact point of a plurality of communication networks, and may be located at a contact point between an LTE network and a WiFi network, for example. The gateway 200 may merge session data transmitted through a plurality of transmission paths into a plurality of transmission paths, or may divide session data transmitted over a single transmission path into a plurality of transmission paths or a plurality of tunnels. The gateway 200 generates at least one tunnel (at least one LTE tunnel through an LTE network, at least one WiFi tunnel through a WiFi network) in at least one transmission path connected to the AT 100, and performs tunnel communication.

Referring to FIG. 3, the gateway 200 includes functional blocks of a kernel space and a user space. The kernel space includes a data link layer (Layer 2) 210, a network layer IP stack 212, and a transport layer TCP / UDP functional block 214. The user space includes a user manager for managing a plurality of terminals. Each user manager may include a session manager 220, a path manager 222, a tunnel manager 224, and a packet encryption and decryption functional block 226. Each user manager creates at least one tunnel with the terminal.

In this way, the terminal 100 and the gateway 200 generate at least one tunnel in the transmission path created in at least one network. And transmits the session data generated in the application layer of the terminal 100 to the gateway 200 through the tunnel through tunneling for UDP / IP encapsulation regardless of the type of the transmission protocol. The gateway 200 transfers the data received through the tunnel to the final destination content servers 400, 410, and 430. Conversely, the gateway 200 transmits the traffic transmitted from the content servers 400, 410, and 430 to the terminal 100 through the tunnel to the application layer of the terminal.

In the following, a signaling method for dynamic tunneling-based traffic transmission is described in detail.

4 and 5 are flowcharts of a service filtering negotiation method for setting a transmission path for each service / application according to an exemplary embodiment.

Referring to FIG. 4, the terminal 100 designates a traffic transmission path for each service / application and transmits a service filtering request signal (Service Filtering Request) to the policy server 300 (S110). The service filtering request signal includes a service-interface (e.g., a service name) mapping an identifier (e.g., package name, IP destination address / port, etc.) identifying a service / application and a transmission path (e.g., WiFi, LTE) Mapping list. &Quot; The service filtering request signal may also include directional information of the transmission path.

The policy server 300 transmits a service filtering setting request signal to the gateway 200 based on the received service filtering request signal (S120).

The gateway 200 determines whether service filtering is provided to the traffic transmission path for each service / application included in the service filtering setting request signal (S130). The gateway 200 may accept (success) or reject (fail) the service filtering setting request based on the load.

The gateway 200 transmits a service filtering setting response signal including whether the service filtering is provided (acceptance or rejection) to the policy server 300 (S140).

The policy server 300 transmits a service filtering response signal (Service Filtering Response) to the terminal 100 based on the received service filtering setting response signal (S150). The service filtering response signal may be a negotiated completion signal.

When the gateway 200 accepts the service filtering for the service / application traffic transmission path requested by the terminal 100, the service / application included in the service filtering request signal transmits / receives the traffic through the transmission path requested by the terminal do. For example, even when the terminal 100 can access both the LTE network and the WiFi network and transmit / receive traffic through two transmission paths, the video service / application can perform service filtering such that traffic is transmitted only through the transmission path through the WiFi network If negotiated, the communication interface can be selected so that a transmission path is generated only in the WiFi network.

In the case where the gateway 200 refuses, the policy server 300 may transmit a modified service filtering setting request signal to the gateway 200 to renegotiate the service.

According to another embodiment, the traffic transmission path for each service / application may be negotiated with the terminal 100 after the gateway 200 or the policy server 300 designates the traffic transmission path for each service / application.

5, when the service filtering information is changed for a specific user or a specific service / application, the policy server 300 transmits a service filtering setting request signal including a service filtering policy to the gateway 200 (S210) . The service filtering policy includes an identifier for identifying a service / application and a transmission path / tunnel generation path (e.g., WiFi, LTE) mapped to the identifier. The filtering request signal may also include directional information of the transmission path. For example, the policy server 300 may designate a traffic transmission path for each user / service for each user considering a data usage amount of each user through the LTE network. Alternatively, the policy server 300 may designate a transmission path on a service / application basis and apply a service filtering policy to users using the transmission path.

The gateway 200 sets a traffic transmission path for each service / application according to the service filtering policy included in the service filtering setting request signal (S220). In this case, the gateway 200 can be set according to the service filtering policy received from the policy server 300, or can accept or reject the service filtering setting request based on the load.

The gateway 200 transmits a service filtering setting response signal to the policy server 300 (S230). The service filtering setting response signal may include setting completion information. When the service 200 includes the failure information in the service filtering setting response signal, the gateway 200 can renegotiate the policy service with the policy server 300.

The policy server 300 transmits a service filtering request signal indicating a service / application-specific traffic transmission path to the terminal 100 based on the service filtering policy established by the gateway 200 (S240). The service filtering request signal includes a " service-interface mapping list "mapping an identifier for identifying a service / application and a transmission path / tunnel generation path (e.g., WiFi, LTE). The service filtering request signal may be a negotiated completion signal.

The terminal 100 sets a traffic transmission path for each service / application according to the received service filtering request signal, and transmits a service filtering response signal to the gateway 200 (S250). The service filtering response signal includes the setup completion information, and may include the setup failure information, and may re-negotiate with the policy server 300.

6 is a flowchart of a service merge negotiation method for setting a dynamic transmission path for each service type according to an exemplary embodiment.

6, the UE 100 designates a traffic transmission path for each type of session (TCP, UDP, etc.) and transmits a control request signal (Service Type Control Request) according to the service type to the policy server 300 (S310) . The service type may be classified according to the traffic characteristics, for example, according to the session maintenance period. That is, a service type can be classified into a web service having a characteristic of a short duration of a session and a streaming / file download service having a characteristic that a session duration is longer than a certain period of time. The control request signal according to the service type includes a path control condition for controlling the transmission path according to the characteristics of the session being used in the tunnel, and the path control condition can be defined variously according to the session characteristics. For example, the control request signal according to the service type may include a service name (identification information of a service / application driven in the terminal), a reference session holding time, and whether or not a merge transfer is performed. For example, after the session is created in the tunnel, the terminal 100 uses the first network (e.g., LTE network) until a specific time corresponding to the reference session holding time, If the transmission is maintained, a conditional merge transmission request can be made to further use the second network (e.g., WiFi network). Alternatively, if the terminal 100 uses a first network (e.g., an LTE network) until a specific time after a session is created in the tunnel, and the data transmission over the session is maintained until after a predetermined time, For example, a WiFi network may request a conditional transmission path change request to change the path.

The policy server 300 transmits a control type registration request signal according to the service type to the gateway 200 based on the control request signal according to the received service type (S320).

The gateway 200 determines whether the path control condition included in the control registration request signal according to the service type is registered (S330). The gateway 200 can accept or decline the control registration request based on the load.

The gateway 200 transmits a service type control register response to the policy server 300 according to the service type including the control registration (accept or reject) (S340).

The policy server 300 transmits a control response signal (Service Type Control Response) according to the service type to the terminal 100 based on the control registration response signal according to the received service type (S350). The control response signal according to the service type may be a negotiated completion signal.

In this way, when the gateway 200 accepts the control registration request according to the service type requested by the terminal 100, the transmission path can be added or the transmission path can be changed according to the registered control condition.

According to another embodiment, the gateway 200 or the policy server 300 may determine a path control condition (for example, a session holding time and a merging transmission) according to a service type and negotiate with the terminal 100 .

FIGS. 7 and 8 are flowcharts of a method for changing the number of tunnels per transmission path according to an embodiment.

Referring to FIG. 7, in tunnel communication, tunneling performance may be deteriorated irrespective of actual network performance, due to limitation of terminal resources and switching of operation with other applications. A terminal in the structure that is allocated an opportunity to process a limited resource from the operating system generates multiple tunnels based on the number of tunnels available as available resources and transmits data through multiple tunnels to a given tunnel It can increase the performance of resources (CPU, memory, I / O processing, etc.).

Next, a method of dynamically changing the number of tunnels generated between the terminal and the gateway to improve the performance of the terminal will be described. Since the number of tunnels implemented by software does not always need to be plural, it is possible to dynamically reduce the number of tunnels when the number of tunnels is unnecessary when dynamically reducing the number of tunnels according to circumstances (for example, when a high transmission rate bandwidth is desired to be allocated).

The terminal 100 and the policy server 300 exchange the authentication key for encryption / decryption and authenticate (S410). The authentication method may be various such as a subscriber identifier (IMSI), an ID / password, and the like.

The policy server 300 performs a user registration request including an authentication key to the gateway 200 (S420).

After the user registration is completed, the terminal 100 transmits a tunnel request signal to the policy server 300 (S430). The tunnel request signal includes tunnel control conditions such as the number of tunnels per communication interface / transmission path (for example, LTE path, WiFi path), quality of service (QoS) .

The policy server 300 transmits a tunnel generation request signal of the terminal 100 to the gateway 200 based on the received tunnel request signal in operation S440.

The gateway 200 determines whether the tunnel control condition included in the tunnel generation request signal is accepted (S450). The gateway 200 may fail the tunnel control condition requesting multiple tunnel generation based on the load.

The gateway 200 transmits a tunnel generation response signal including the acceptance of the tunnel control condition to the policy server 300 (S460).

The policy server 300 transmits a tunnel response signal (Tunnel Response) to the AT 100 based on the received tunnel generation response signal (S470).

In this way, the terminal 100 and the gateway 200 generate at least one tunnel for each communication interface / transmission path according to the negotiated tunnel control condition, and perform data encryption for each tunnel using the encryption algorithm specified in the specific tunnel . That is, the number of tunnels can be specified differently for each communication interface / transmission path.

Referring to FIG. 8, the terminal 100 and the gateway 200 dynamically change (increase or decrease) the number of tunnels per communication interface / transmission path generated according to the negotiated tunnel control condition according to the state. The terminal 100 can dynamically change the number of tunnels by sending a tunnel request signal to the policy server 300 based on the performance status information for each communication interface / transmission path, The number of tunnels can be dynamically varied by control.

The terminal 100 reports performance status information for each communication interface / transmission path to the policy server 300 (S510). The terminal 100 may periodically report the performance status information to the policy server 300. [

The policy server 300 receives the tunnel status information from the gateway 200 tuned to the terminal 100 (S520). The tunnel status information may include a load of the gateway 200, a data transmission amount through a tunnel, or the like, or may include the number of tunnels that can be added.

The policy server 300 determines tunnel addition or reduction in the number of generated tunnels based on the performance state information for each interface / transmission path of the terminal 100 and the tunnel state information of the gateway 200, A tunnel request is made (S530). The tunnel request may be transmitted to the terminal 100 and / or the gateway 200. The policy server 300 may request the terminal 100 to add a tunnel when it is determined that tunneling resource provision is possible.

The terminal 100 transmits a tunnel response to the tunnel request (S540). The tunnel response may include success / acceptance (Success). The terminal 100 may generate at least one tunnel through tunneling with the gateway 200 according to the tunnel control request, or may remove at least one generated tunnel.

9 is a flowchart of a transmission mode negotiation method according to an embodiment.

Referring to FIG. 9, the terminal 100 and the gateway 200 are connected to each other through a multiple communication interface / multiplex transmission path, and data is transmitted bidirectionally through at least one tunnel created in each communication interface / transmission path. At this time, the transmission mode can be selected.

The terminal 100 transmits a transport mode request signal to the policy server 300 (S610). The transmission mode may include an aggregation transmission mode for transmitting different data through multiple tunnels, a redundant mode for transmitting the same data through multiple tunnels, and a backup transmission mode. Of these, when changing to the backup transfer mode in the merge transfer mode or the redundant transfer mode, the communication interface to be used as a backup must be explicitly included.

The policy server 300 transmits a transmission mode notification signal (Transport Mode Notify) included in the transmission mode request signal to the gateway 200 (S620).

The gateway 200 changes the transmission mode according to the transmission mode notification signal and transmits a transmission mode change completion signal to the policy server 300 (S630). If the gateway 200 can not change the transmission mode, it can notify the policy server 300 of this.

The policy server 300 transmits a transmission mode response signal (Transport Mode Response) to the terminal 100 (S640). The transmission mode response may include success / acceptance (Success).

The terminal 100 and the gateway 200 transmit data through multiple tunnels according to the negotiated transmission mode.

10 and 11 are flowcharts of a transmission path changing method for ensuring session continuity according to an embodiment.

Referring to FIG. 10, in a state where the terminal 100 is connected to a plurality of networks, the connection state may be changed from time to time due to a deviation in coverage or a connection error depending on a situation such as a terminal movement. In this case, in order to guarantee session continuity, the terminal 100, the gateway 200, and the policy server 3300 monitor the status of the communication interface as follows.

The terminal 100 transmits a health check request signal to the policy server 300 (S710). The health check request signal includes a communication interface / transmission path, a check interval, a number of failures, and the like to be subjected to the health check. The check interval may be different for each communication interface / transmission path.

The policy server 300 transmits a health check notification signal to the gateway 200 (S720). The gateway 200 can know that the health check of the terminal 100 is proceeding.

The policy server 300 transmits a health check response signal to the terminal 100 (S730).

The terminal 100 transmits a hello message to the gateway 200 through the first communication interface (S740). The terminal 100 may transmit a hello message in a UDP packet.

The gateway 200 transmits the hello message to the first communication interface of the terminal 100 (S750).

The terminal 100 transmits a hello message to the gateway 200 through the second communication interface (S760).

The gateway 200 transmits a hello message to the second communication interface of the terminal 100 (S770).

The terminal 100 receiving the health check response signal transmits a hello message to the gateway 200 for each communication interface / transmission path to check the state of the access network.

Referring to FIG. 11, a hello message transmitted for health check may be omitted. In this case, each of the terminal 100 and the gateway 200 can recognize that there is a problem in the connection itself. When each of the terminal 100 and the gateway 200 determines that the transmission network is not in good condition, the terminal 100 and the gateway 200 remove the tunnel of the corresponding path and transmit the fault to the counterpart.

When the terminal 100 confirms that the hello message transmitted for the health check is missing or not transmitted, the terminal 100 removes the path through the communication interface or restricts the data transmission (S810).

The terminal 100 transmits a health check fail notification to the policy server 300 (S820). The health check failure notification signal includes information of the communication interface that has not received the hello message.

The policy server 300 transmits a health check failure notification signal to the gateway 200 (S830).

The gateway 200 removes the path through the communication interface included in the health check failure notification signal or restricts data transmission (S840). On the other hand, if the gateway 200 does not receive the hello message from the terminal for a predetermined period of time before receiving the health check failure notification signal, the gateway 200 may remove the path through the communication interface where the problem occurs, or restrict the data transmission.

As described above, the terminal 100 can restrict the upstream data transmission through the communication interface where the problem occurs, or can remove the transmission path through the communication interface. The gateway 200 may restrict downlink data transmission to the communication interface in which a problem occurs, or may remove a transmission path through the communication interface. The terminal 100 and the gateway 200 maintain the tunneling communication through the normal communication interface / transmission path. At this time, since the end-to-end session communication processed in the tunnel is continuously maintained, the service is not affected even if the data transmission through the specific communication interface is restricted.

In this manner, session data is transmitted through at least one tunnel created in at least one transmission path through signaling between the terminal 100, the policy server 300, and the gateway 200, and multi-network transmission or multi- All of the transmission over the selected network can be done. The transmission method can be selected by negotiating various transmission conditions by in-band signaling between the terminal 100, the policy server 300, and the gateway 200. It is possible to individually determine the single session traffic by the in-band signaling between the terminal 100, the policy server 300, and the gateway 200, and determine the traffic path on a session-by-session basis when a plurality of sessions are generated.

The embodiments of the present invention described above are not implemented only by the apparatus and method, but may be implemented through a program for realizing the function corresponding to the configuration of the embodiment of the present invention or a recording medium on which the program is recorded.

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, It belongs to the scope of right.

Claims (16)

In order to transmit traffic between a terminal that generates at least one transmission path through a plurality of communication interfaces connecting to a plurality of communication networks and a gateway that transmits and receives session data through at least one transmission path connected to the terminal, And a method of signaling with a gateway,
Transmitting, by the gateway, a service filtering setting request signal including a transmission path designated for a specific service / application of the terminal;
Receiving a service filtering setting response signal including an acceptance of the service filtering setting request signal from the gateway, and
And transmitting a negotiation completion signal generated based on the service filtering setting response signal to the terminal,
Wherein the gateway receiving the service filtering setting request signal and the terminal receiving the negotiation completion signal transmit and receive traffic for the specific service / application using the communication network corresponding to the designated transmission path among the plurality of communication networks, Signaling method. The method of claim 1,
The step of transmitting the service filtering setting request signal
Receiving a service filtering request signal including a service-interface mapping list from the terminal, generating the service filtering setting request signal based on the service-interface mapping list, and transmitting the service filtering setting request signal to the gateway,
The negotiation completion signal is a service filtering response signal which is a response to the service filtering request signal,
Wherein the service-interface mapping list includes information that the specific service / application and the specified transmission path are mapped. The method of claim 1,
The step of transmitting the negotiation completion signal
And transmits a service-interface mapping list in which the specific service / application and the designated transmission path are mapped to the terminal. The method of claim 1,
Receiving a service filtering setup response signal including a rejection of the service filtering setup request signal from the gateway, and
Transmitting a modified service filtering setting request signal to the gateway and renegotiating
≪ / RTI > In order to transmit traffic between a terminal that generates at least one transmission path through a plurality of communication interfaces connecting to a plurality of communication networks and a gateway that transmits and receives session data through at least one transmission path connected to the terminal, And a method of signaling with a gateway,
Transmitting to the gateway a control registration request signal including a transmission path dynamic control condition for the terminal,
Receiving a control registration response signal including an acceptance of the control registration request signal from the gateway, and
And transmitting a negotiation completion signal generated based on the control registration response signal to the terminal,
Wherein the transmission path control condition includes a service name of a control object, a transmission path or a session holding time required for adding a tunnel, and a communication interface in which an additional transmission path or an additional tunnel is generated,
The gateway receiving the control registration request signal and the terminal receiving the negotiation completion signal generate the additional transmission path or the additional tunnel when the session corresponding to the service name continues for the session holding time, The signaling method comprising: In order to transmit traffic between a terminal that generates at least one transmission path through a plurality of communication interfaces connecting to a plurality of communication networks and a gateway that transmits and receives session data through at least one transmission path connected to the terminal, And a method of signaling with a gateway,
Receiving a tunnel request signal including a tunnel control condition from the terminal,
Transmitting a tunnel generation request signal including the tunnel control condition to the gateway,
Receiving, from the gateway, a tunnel generation response signal including an acceptance of the tunnel generation request signal; and
And transmitting to the terminal a tunnel response signal generated based on the tunnel generation response signal,
Wherein the tunnel control condition includes a number of generated tunnels by a transmission path, and the gateway receiving the tunnel request signal and the terminal receiving the tunnel response signal generate tunnel numbers per transmission path according to the tunnel control condition, Signaling method. The method of claim 6,
The tunnel control condition is
The method of claim 1, further comprising: 8. The method of claim 7,
Receiving an authentication key for encryption / decryption from the terminal, and
Further comprising transmitting a user registration request signal including the authentication key to the gateway,
Wherein the authentication key is used for data encryption decrypted in a data encrypted tunnel. The method of claim 6,
Determining an increase or a decrease in the number of tunnels generated in the specific transmission path based on the state information of the terminal and the gateway, and
And transmitting to the terminal a tunnel request signal including an increase or a decrease in the determined number of tunnels,
Wherein the terminal adds a tunnel connected to the gateway or removes a connected tunnel according to the tunnel request signal. In order to transmit traffic between a terminal that generates at least one transmission path through a plurality of communication interfaces connecting to a plurality of communication networks and a gateway that transmits and receives session data through at least one transmission path connected to the terminal, And a method of signaling with a gateway,
Receiving a health check request signal for a transmission path from the terminal,
Transmitting a health check notification signal requested by the terminal to the gateway, and
Transmitting a health check response signal for the health check request signal to the terminal,
Wherein the terminal and the gateway that have received the health check response signal exchange a hello message over the at least one transmission path. 11. The method of claim 10,
The health check request signal
A signaling method comprising a transmission path and a check interval to be health checked. A method of operating a terminal for traffic transmission / reception with a gateway through at least one of multiple communication interfaces connecting to a plurality of communication networks,
Transmitting a service-interface mapping list in which a specific service / application and a specific transmission path are mapped to a policy server to request service filtering;
Receiving, from the policy server, a response including a service filtering acceptance of the gateway for the service-interface mapping list; and
Sending and receiving session data of the specific service / application to the gateway through a communication interface corresponding to the specific transmission path among the multiple communication interfaces
The method comprising the steps of: The method of claim 12,
Transmitting a tunnel control condition including the number of generated tunnels for each transmission path to the policy server; and
Further comprising receiving from the policy server a response including a control acceptance of the gateway to the tunnel control condition,
The step of transmitting / receiving the session data to /
Generating at least one tunnel in the specific transmission path based on the number of generated tunnels for each transmission path included in the tunnel control condition, and transmitting / receiving the session data to / from the gateway. The method of claim 13,
Wherein the tunnel control condition further includes whether or not to encrypt each tunnel,
The step of transmitting / receiving the session data to /
And encrypting data transmitted to a tunnel that is a data encryption target among the tunnels generated in the specific transmission path based on the tunnel control condition, and transmitting the encrypted data to the gateway. The method of claim 12,
Transmitting a health check request for the specific transmission path to the policy server,
Receiving a notification from the policy server to the gateway for the health check request; and
Transmitting a hello message to the gateway through a communication interface corresponding to the specific transmission path among the multiple communication interfaces
Further comprising the steps of: 16. The method of claim 15,
Restricting data transmission to the communication interface corresponding to the specific transmission path when the hello message is missing or does not receive a response to the hello message from the gateway, and
Notifying the policy server of a health check failure
Further comprising the steps of:

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