KR20130065253A

KR20130065253A - Method and apparatus for starting the device to device communication, method and apparatus for stopping the device to device communication

Info

Publication number: KR20130065253A
Application number: KR1020110132025A
Authority: KR
Inventors: 신재승; 장문수; 임순용; 박애순; 강숙양; 양미정; 정광렬; 황유선
Original assignee: 한국전자통신연구원
Priority date: 2011-12-09
Filing date: 2011-12-09
Publication date: 2013-06-19

Abstract

PURPOSE: A D2D(Device to Device) communication starting and terminating method and a device thereof are provided to offer a detailed procedure between the devices by activating and setting a D2D bearer according to an RRC(Radio Resource Control) connection reconfiguration message of a base station. CONSTITUTION: When a D2D link is able to be set, a first and a second device(110,120) transmit a D2D connection inspection response message to a base station(210). The first and the second device sets a D2D bearer based on an RRC connection reconfiguration request message of the base station and transmits the RRC connection reconfiguration response message to the base station. The first and the second device activate a D2D bearer based on a D2D bearer activation request message of the base station and transmit the D2D bearer response message to the base station. [Reference numerals] (110) First device; (120) Second device; (210) First base station; (AA,S311) Response to D2D connection inspection; (BB) Send a message of D2D communication availability; (S301) Determine the availability of D2D communication; (S303) Request to check the availability of D2D communication; (S305) Request D2D connection inspection; (S307) Check the availability of D2D link setting and check the intention for D2D communication; (S315) Request generation of a D2D bearer; (S317) Request D2D bearer configuration and session management; (S319) Request RRC connection reconfiguration; (S321) Set a D2D bearer; (S323,S325) Response to RRC connection reconfiguration

Description

METHOD AND APPARATUS FOR STARTING THE DEVICE TO DEVICE COMMUNICATION, METHOD AND APPARATUS FOR STOPPING THE DEVICE TO DEVICE COMMUNICATION}

The present invention relates to direct wireless communication between devices (device-to-device communication, hereinafter referred to as 'D2D communication'), and more particularly, to a D2D communication start method and device, and a D2D communication end method and device.

Recently, as the use of applications for transmitting or receiving a large amount of data through radio is increased, a frequency of overloading of a mobile communication network is increasing rapidly while using a smart phone, and a network failure due to a surge of an overload frequency of a mobile communication network And degradation of service quality are becoming serious problems.

Accordingly, as one solution to solve the above-described problems, there is a solution to the problem of direct-wireless communication (hereinafter referred to as " D2D communication ") between adjacent devices within a radius of 1 to 2 Km located in the same or nearby cells in a mobile communication system ) Is being studied.

Herein, D2D communication is a technology for establishing a D2D radio link through a mobile communication air interface using a mobile communication frequency band between adjacent devices, and then performing direct data transmission / reception between devices via a D2D wireless link without passing through a base station.

The advantages of this D2D technology are various. Unlike existing WiFi-Direct, Bluetooth, Zigbee, etc. can only support communication between devices within hundreds of meters, D2D between devices located within a radius of 1 ~ 2 Km based on the medium / long distance transmission capability provided by the mobile communication interface Communication is possible.

In addition, since the D2D communication does not pass through the network, the load on the network can be reduced. When neighboring devices located in the cell boundary area communicate with each other via a base station, only low-speed data transmission is possible, but when they directly communicate with each other, high-speed data transmission is possible due to the improved signal environment between neighboring devices. As a result, it is possible to use a higher performance service among users.

In addition, when adjacent devices located in a cell boundary area communicate via a base station, they must maintain high transmit power to reach the base station, but if these devices communicate directly, the transmit power can be greatly reduced. It has the effect of extending battery life.

However, in recent years, D2D communication based on cellular is started to be discussed in 3GPP systems, and many problems with D2D communication have arisen. In particular, the problem is that the specific procedure for the start of the D2D communication and the end of the D2D communication is not presented.

An object of the present invention for solving the above problems is to provide a method and apparatus for starting a D2D communication to present a specific start procedure of the D2D communication.

Another object of the present invention is to provide a method and apparatus for terminating a D2D communication, which presents a specific termination procedure of the D2D communication.

According to the D2D communication start method according to an embodiment of the present invention for achieving the above object, in the method for the device to start the D2D communication, whether the D2D link can be established based on the D2D connection check request message received from the base station Confirming, if the D2D link is configured, transmitting a D2D connection check response message to the base station, establishing a D2D bearer based on the RRC connection reconfiguration request message received from the base station, and connecting the RRC to the base station. Transmitting a reconfiguration response message and activating a D2D bearer based on the D2D bearer activation request message received from the base station and transmitting a D2D bearer activation response message to the base station.

Here, the method of initiating D2D communication may further include transmitting a D2D service request message to a network before checking whether the D2D link can be established.

In addition, in the D2D communication start method according to an embodiment of the present invention for achieving another object of the present invention, a D2D connection check request message based on a D2D communication capable confirmation request message received from a gateway (GW) device Is transmitted to the first and second devices, and based on the D2D connection check response message received from the first and second devices, if it is determined that D2D communication of the first and second devices is possible, D2D communication Transmitting an RRC connection reconfiguration message to the gateway device based on a bearer establishment request and a session management request message received from a mobility management entity (MME); And transmitting to the second device, and receiving the RRC connection reconfiguration response received from the first and second devices. Transmitting a D2D bearer setup response message to the mobility management device based on the response message; transmitting a D2D bearer activation request message to the first and second devices; and a D2D received from the first and second devices. And sending a session management response message to the mobility management device based on a bearer activation response message.

In addition, in a method of starting a D2D communication by a gateway (GateWay) device according to an embodiment of the present invention for achieving another object of the present invention, the step of transmitting a D2D communication availability confirmation request message to the base station And when a D2D communication capable message is received from the base station, transmitting a D2D bearer generation request message to a mobility management entity (MME) and receiving a D2D bearer generation response message from the mobility management apparatus. do.

The transmitting of the D2D communication availability check request message to the base station may include analyzing a packet based on the address information of the IP packet, and analyzing the packet to determine a source and a destination, respectively. Determining whether the device corresponds to the device; and if the source is the first device and the destination is the second device, determining whether the base station of the first device and the base station of the second device are the same or adjacent to each other; and When the base station of the first device and the base station of the second device are the same or located in the vicinity, a message confirming whether the D2D communication of each of the first device and the second device can be sent to the base station of the first device and the second device The method may include transmitting to at least one base station.

Here, before the step of transmitting the D2D communication availability confirmation request message to the base station, the step of receiving an IP-CAN session change (Internet Protocol-Connectivity Access Network Session Modification) message from a Policy and Charging Rule Function It may further include.

In addition, in the method for terminating the D2D communication by the base station according to an embodiment of the present invention for achieving another object of the present invention, monitoring the data transmission of the first and second devices, and for a predetermined time If a direct data transmission between the first and second devices is not detected, transmitting an RRC connection reconfiguration message to the first device and an RRC connection reconfiguration response message corresponding to the RRC connection reconfiguration message from the first device. Receiving the.

In addition, in a method for terminating a D2D communication by a device according to an embodiment of the present invention for achieving another object of the present invention, determining whether or not to terminate the D2D communication, and as a result of the determination that the D2D communication is terminated If determined, transmitting the D2D communication termination request message to the base station, releasing the D2D link based on the RRC connection reconfiguration message received from the base station, and transmitting an RRC connection reconfiguration response message to the base station.

The determining of whether the D2D communication is terminated may include determining that the D2D communication is terminated when at least one event of data transmission completion, data transmission impossible, and data reception impossible occurs.

In addition, the device according to an embodiment of the present invention for achieving the another object of the present invention, based on the D2D connection check request message received from the base station to confirm whether the D2D link can be established and the D2D communication execution intention to confirm If it is determined that D2D link establishment is possible and the intention of D2D communication is performed, a D2D connection check response message is transmitted to the base station, and an RRC connection reconfiguration request message is received from the base station to establish a D2D bearer and reconfigure an RRC connection to the base station. After transmitting the response message, the D2D bearer activation request message is received from the base station to activate the D2D bearer and transmit the D2D bearer activation response message.

Here, the device may transmit the D2D service request message to the network before receiving the D2D connection test request message from the base station.

Here, the device determines that the D2D communication is terminated when at least one event of data transmission completion, data transmission failure, and data reception failure occurs while directly communicating with the counterpart device, and the D2D communication is performed to the base station. The terminal may transmit the termination request message, release the D2D link based on the RRC connection reconfiguration message received from the base station, and then transmit an RRC connection reconfiguration response message to the base station.

In addition, the base station according to an embodiment of the present invention for achieving another object of the present invention, based on the D2D communication check request message received from the gateway (GateWay (GW)) device to the first D2D connection check request message; And transmitting a D2D communication capable message to the second device and determining that the D2D communication between the first and second devices is possible based on the D2D connection check response message received from the first and second devices. And transmit an RRC connection reconfiguration message to the first and second devices based on a bearer establishment request and a session management request message received from a mobility management entity. D2D bearer setup response based on the RRC connection reconfiguration response messages received from the first and second devices After transmitting the message to the mobility management device, and transmits a D2D bearer activation request message to the first and second devices, the session management response message based on the D2D bearer activation response message received from the first and second devices Transmits to the mobility management device.

Here, the base station monitors the data transmission of the first and second devices, and if the direct data transmission between the first device and the second device is not detected for a preset time, the base station sends an RRC connection reconfiguration message to the first device. Send to a device, and receive an RRC connection reconfiguration response message corresponding to the RRC connection reconfiguration message from the first device.

In addition, the D2D connection control apparatus according to an embodiment of the present invention for achieving another object of the present invention after transmitting a request message confirming the availability of the D2D communication to the base station, when the D2D communication capable message is received from the base station, The D2D bearer creation request message is transmitted to a mobility management entity, and a D2D bearer creation response message is received from the mobility management apparatus.

In this case, the D2D connection control device analyzes the packet based on the address information of the IP packet, and the source and destination are devices, and when the base stations of the two devices are the same or located in the vicinity, D2D communication A availability message may be sent to the base station.

The transmitting of the D2D communication availability confirmation request message to the base station may be performed based on an IP-CAN session change message received from a policy and charging rule function. The D2D connection control device may transmit a request message confirming the availability of the D2D communication to the base station.

The D2D connection controller may be a packet data network gateway (P-GW).

According to the D2D communication start method according to an embodiment of the present invention as described above, when a D2D communication request message is transmitted to an application server (APP), and the D2D link setting is possible from the device and the D2D communication intention is confirmed, Receives an RRC connection reconfiguration message from the base station and performs D2D bearer setup and activation. Therefore, a detailed procedure for initiating direct two-way wireless communication between neighboring devices can be proposed.

In addition, according to the D2D communication termination method according to another embodiment of the present invention, by monitoring the data transmission of the first and second devices, if there is no resource allocation request from the first and second devices for a predetermined time, RRC D2D communication is terminated by transmitting a connection reconfiguration message and receiving an RRC connection reconfiguration response message. Therefore, a specific procedure of terminating the D2D communication while performing the D2D communication may be presented.

1 is a conceptual diagram illustrating a concept of an adjacent device.
2 is a flowchart illustrating a procedure for a device attaching to a base station to establish a session.
3 (FIG. 3A, FIG. 3B) is a flowchart illustrating a method of initiating D2D communication according to an embodiment of the present invention.
4 is a flowchart illustrating a D2D communication start method performed in a device according to an embodiment of the present invention.
5 is a flowchart illustrating a D2D communication start method performed in a base station according to an embodiment of the present invention.
6 is a flowchart illustrating a D2D communication start method performed in a packet data network gateway according to an embodiment of the present invention.
7 (7a and 7b) are flowcharts illustrating a method of starting D2D communication according to another embodiment of the present invention.
8 is a flowchart illustrating a temporary termination method of D2D communication according to another embodiment of the present invention.
9 is a flowchart illustrating a temporary termination method of D2D communication performed in a base station according to another embodiment of the present invention.
FIG. 10 is a flowchart illustrating a temporary termination method of D2D communication between devices existing in a neighbor cell according to another embodiment of the present invention.
FIG. 11 is a flowchart illustrating a method of temporarily terminating D2D communication between devices existing in a neighbor cell performed by a first base station according to another embodiment of the present invention.
12 is a flowchart illustrating a temporary termination method of device-to-device D2D communication existing in a neighbor cell performed by a second base station according to another embodiment of the present invention.
13 is a flowchart illustrating an explicit termination method of D2D communication according to another embodiment of the present invention.
14 is a flowchart illustrating an explicit termination method of D2D communication performed in a device according to another embodiment of the present invention.
15 is a flowchart illustrating a method for explicitly terminating D2D communication between devices existing in a neighbor cell according to another embodiment of the present invention.
16 is a flowchart illustrating a method for explicitly terminating a D2D communication between devices existing in a neighbor cell performed by a first base station according to another embodiment of the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail.

It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

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

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be interpreted in an ideal or overly formal sense unless explicitly defined in the present application Do not.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In order to facilitate the understanding of the present invention, the same reference numerals are used for the same constituent elements in the drawings and redundant explanations for the same constituent elements are omitted.

1 is a conceptual diagram illustrating a concept of an adjacent device.

Referring to FIG. 1, the first device 110 and the second device 120 are adjacent devices, belonging to the first base station 210 in the same cell, and are capable of communicating through an air interface.

In addition, the third device 130 and the fourth device 140 exist in the neighboring cell as the adjacent device, the third device 130 is in the first base station 210 and the fourth device 140 is in the second base station ( The third device 130 and the fourth device 140 may communicate with each other through a wireless interface.

Here, the adjacent device refers to a device within a radius of 1 ~ 2 Km each located in the same cell or a neighboring cell that can communicate through a wireless interface.

In addition, the first device 110, the second device 120, the third device 130, and the fourth device 140 may not only be a smart phone but also a notebook computer, a palmtop computer, an ultra mobile personal computer (UMPC). It may be a variety of devices having communication functions such as a tablet PC, a personal digital assistant (PDA), a web pad, and the like.

Also, in the present invention, a base station is an entity of a communication network, often referred to as a Node B or NB. In particular, in the Evolved-Universal Terrestrial Radio Access Network (E-UTRAN), the 'evolved' base station is referred to as an eNB.

2 is a flowchart illustrating a procedure for a device attaching to a base station to establish a session.

Referring to FIG. 2, the first device 110 attaches to the first base station 210 and establishes a session. Through the attach and session procedure, the first base station 210 detects that the first device 110 belongs to its own area, and the network devices, for example, the first base station 210 and the mobility management device. Management Entity (MME) 300, Serving Gateway (Serving GateWay: S-GW) 400, Packet Data Network GateWay (P-GW), Policy Management Device (Policy and Charging Rule Function: PCRF) (600), the application server (APP), etc. IP address and tunnel (tunnel) of the other network devices to deliver the ID (ID) information of the device and IP packets transmitted from or received from the device through the network devices ) Obtain information such as ID. In addition, the network devices allocate an IP address for the first device 110.

Hereinafter, in an embodiment of the present invention, the first, second, third, and fourth devices attach to a base station in each cell to which they belong, and establish a session required for communication, and the application server The initial condition is assumed to be connected to (Application Server: APP) or communicating through a network using an IP (Internet Protocol) address between devices.

3 (FIG. 3A and FIG. 3B) are flowcharts illustrating a method of starting device-to-device (D2D) communication according to an embodiment of the present invention.

D2D communication start method according to an embodiment of the present invention is the first device 110, the second device 120, the first base station 210, mobility management device 300, serving gateway 400, packet data network The message may be transmitted and received between the gateway 500, the policy management apparatus 600, and the application server 700.

In detail, the first device 110 checks whether the D2D link can be established and the D2D communication intention based on the D2D connection check request message received from the first base station 210, and thus the D2D link can be established and the D2D communication is executed. If the intention is confirmed, the D2D connection check response message is transmitted to the first base station 210, and the RRC connection reconfiguration request message is received from the first base station 210 to set up the D2D bearer. 1 After the RRC connection reconfiguration response message is transmitted to the base station 210, the D2D bearer activation request message is received from the first base station 210 to activate the D2D bearer, and the D2D bearer activation response message is transmitted.

In addition, the first device 110 may transmit the D2D service request message to the application server before receiving the D2D connection check request message from the first base station 210.

The first base station 210 transmits the D2D connection check request message to the first and second devices 110 and 120 based on the D2D communication enabled confirmation request message received from the packet data network gateway 500. If it is determined based on the D2D connection check response message received from the second device (110, 120), and it is determined that the D2D communication between the first and second devices (110, 120) is possible, the D2D communication capable message is sent to the packet data network gateway. Transmits an RRC connection reconfiguration request message to the first and second devices based on the bearer establishment request and session management request message received from the mobility management apparatus 300, and transmits the first and second devices. After transmitting the D2D bearer setup response message to the mobility management device 300 based on the RRC connection reconfiguration response message received from the device, the first and second devices Transmits a D2D bearer activation request message to the nodes 110 and 120, and transmits the session management response message to the mobility management device 300 based on the D2D bearer activation response messages received from the first and second devices 110 and 120. send.

The D2D connection controller (for example, the packet data network gateway 500 of FIG. 3) transmits a request message for confirming whether D2D communication is available to the first base station 210, and then enables D2D communication from the first base station 210. When the message is received, the D2D bearer creation request message is transmitted to the mobility management device 300, and the D2D bearer creation response message is received from the mobility management device 300.

Here, the D2D connection controller analyzes the packet based on the address information of the IP packet, and a source is a first device and a destination is a second device, and the base station and the second device of the first device. When the base stations of the same or in the vicinity, the first device and the second device can confirm whether the D2D communication availability message to at least one of the base station of the first device and the base station of the second device.

In addition, the D2D connection control device may receive an IP-CAN session change (Internet Protocol-Connectivity Access Network Session Modification) message from the policy management device (600).

Hereinafter, a method of starting D2D communication according to an embodiment of the present invention.

Referring to FIG. 3, the method of initiating D2D communication according to an embodiment of the present invention starts with a D2D service request (S301).

Here, the D2D service request of step 301 is largely divided into a request by a device and a detection by a network.

First, when the D2D service request (S301) by the request by the device transmits the D2D service request message with the second device 120 to the application server 700, the application server 700 1 transmits the session information of the device 110 to the policy management apparatus 600.

Subsequently, the D2D service request may be performed by the policy management apparatus 600 transmitting the IP-CAN session change (Internet Protocol-Connectivity Access Neteork Session Modification) message to the packet data network gateway 500.

Here, the first device 110 connected to the application server 700 may recognize a device located in its vicinity through an application that provides various location services and may attempt direct communication with the peripheral device.

Alternatively, the detection may be performed through a network. The D2D service request through the detection by the network (S301) will be described in detail with reference to FIG. 6.

The packet data network gateway 500 transmits a D2D communication availability confirmation request message to the first base station 210 through the serving gateway 400 and the mobility management device 300 based on the D2D service request through step 301 ( S303).

Thereafter, the first base station 210 transmits the D2D connection check request message to each of the first device 110 and the second device 120 based on the received D2D communication availability confirmation request message (S305).

When the first device 110 and the second device 120 receive the D2D connection check request message through step 305, the first device 110 and the second device 120 perform the D2D link establishment check and the D2D execution intention check based on the received D2D connection check request message. (S307).

Here, the D2D execution intention doctor may check whether the D2D execution intention is selected by the user, and may determine whether the D2D execution intention is in accordance with information preset in each of the first device 110 and the second device 120.

When the D2D link may be established through the step 307 and the intention of the D2D communication is confirmed by the user, the first device 110 and the second device 120 transmit the D2D connection test response message to the first base station 210. (S309, S311).

Subsequently, the first base station 210 determines whether the first device 110 and the second device 120 can perform D2D communication based on the received D2D connection check response message, and if the D2D communication is possible, the D2D communication available message. Is transmitted to the packet data network gateway 500 (S313).

The packet data network gateway 500 transmits a D2D bearer generation request message to the mobility management device 300 based on the D2D communication capable message received from the first base station 210 (S315).

Thereafter, the mobility management device 300 receives the D2D bearer creation request message from the packet data network gateway 500, and transmits a D2D bearer establishment request message and a session management request message to the first base station 210 (S317).

The first base station 210 transmits an RRC connection reconfiguration request message to the first device 110 and the second device based on the D2D bearer establishment request message and the session management request message received through step 317. 120) (S319).

Here, the RRC connection reconfiguration request message may include a content indicating the D2D radio link establishment through the D2D bearer.

The first device 110 and the second device 120 respectively allocate radio resources to establish a D2D radio link through the D2D bearer (S321).

When the first device 110 and the second device 120 establish a D2D bearer through step 321, the first device 110 and the second device 120 transmit an RRC connection reconfiguration response message to the first base station 210 (S323 and S325).

Thereafter, the first base station 210 transmits a D2D bearer establishment response message corresponding to the D2D bearer establishment request message to the mobility management device 300 based on the received RRC connection reconfiguration response message (S327).

When the RRC connection reconfiguration response message is received, the first base station 210 transmits a D2D bearer activation request message to the first device 110 and the second device 120 (S329).

The first device 110 and the second device 120 activate the D2D bearer based on the D2D bearer activation request message received through step 329, and transmit a D2D bearer activation response message to the first base station 210 ( S331, S333).

The first base station 210 receives the D2D bearer activation response from the first device 110 and the second device 120, and transmits a session management response message to the mobility management apparatus 300 (S235).

The mobility management device 300 transmits a D2D bearer generation response message to the packet data network gateway 500 based on the session management response message received in step 235 (S337).

4 is a flowchart illustrating a D2D communication start method performed in a device according to an embodiment of the present invention.

Hereinafter, it is assumed that the first device 110 and the second device 120 belong to the first base station 210 in the same cell.

Referring to FIG. 4, in the method of initiating D2D communication according to an embodiment of the present invention, the first device 110 requests a D2D service request message (S410), checks the D2D connection (S420), and then performs D2D communication. Prepare (S430).

In detail, the first device 110 transmits a service request message to the application server 700 (S410).

Thereafter, the first device 110 receives a D2D connection check request message from the first base station 210 (S421), and checks whether the D2D link can be established based on the received D2D connection check request message (S423).

If it is confirmed in step 423 that the D2D link setting is possible, the first device 110 confirms the intention to execute the D2D communication (S425).

Here, the D2D communication execution doctor may check whether the D2D execution intention is selected by the user, and may check whether the D2D execution intention is in accordance with information previously set in the first device 110.

If it is determined that the D2D communication intention is determined through the step 425, the first device 110 transmits a D2D connection test response message to the first base station 210 (S427).

Thereafter, when the RRC connection reconfiguration message is received from the first base station 210 (S431), the first device 110 sets up a D2D bearer based on the received RRC connection reconfiguration message (S433).

When the D2D bearer setup is completed through step 333, the first device 110 transmits an RRC connection reconfiguration response message to the first base station 210 (S435).

Subsequently, when the D2D bearer activation request message is received from the first base station 210 (S437), the first device 110 activates the D2D bearer based on the received bearer activation request message and sends a D2D bearer activation response message to the first device 110. It transmits to the base station 210 (S439).

5 is a flowchart illustrating a D2D communication start method performed in a base station according to an embodiment of the present invention.

Referring to FIG. 5, in the method of initiating D2D communication according to an embodiment of the present invention, the first base station 210 checks whether the first device 110 and the second device 120 are capable of D2D communication ( In step S510, the D2D communication between the first device 110 and the second device 120 is prepared (S520).

In detail, the first base station 210 receives a D2D communication enabled confirmation request message from the packet data network gateway 500 (S511), and transmits a D2D connection check request message based on the received D2D communication enabled confirmation request message to the first device. In operation S513, the processor 110 transmits the information to the second device 120 and the second device 120.

Thereafter, the first base station 210 receives the D2D connection test response message from the first device 110 and the second device 120 (S515), and then, based on the received D2D connection test response message, the first device 110 is provided. ) And whether the second device 120 is capable of D2D communication (S517).

Here, the determination of whether the first device 110 and the second device 120 are capable of D2D communication may include state information (eg, signal strength, pilot measurement value, and round trip delay) included in the D2D connection test response message. RTD), location information, etc.).

If it is determined that the D2D communication between the first device 110 and the second device 120 is possible through step 517, the first base station 210 transmits a D2D communication capable message to the packet data network gateway 500 (S519). ).

Thereafter, when the first base station 210 receives the D2D bearer establishment request message and the session management request message from the mobility management apparatus 300 (S521), the first base station 210 reconfigures the RRC connection to the first device 110 and the second device 120. The request message is transmitted (S522).

The first base station 210 receives the RRC connection reconfiguration response message from the first device 110 and the second device 120 (S523), and moves the D2D bearer setup response message based on the received RRC connection reconfiguration response message. The control apparatus 300 transmits to the management apparatus 300 (S524).

Thereafter, the first base station 210 transmits the D2D bearer activation request message to the first device 110 and the second device 120, respectively (S525).

When the first base station 210 receives the D2B bearer activation response message from the first device 110 and the second device 120 through step 525 (S526), the mobility management is performed based on the received D2D bearer activation response message. In operation S527, the device 300 transmits a session management response message.

6 is a flowchart illustrating a D2D communication start method performed in a packet data network gateway according to an embodiment of the present invention.

It is assumed that the first device 110 and the second device 120 belong to the first base station 210.

Referring to FIG. 6, the packet data network gateway 500 may configure the attach and session of the first device 110 and the second device 120 in the process of establishing the first device 110 and the second device. The device 120 receives and stores ID information of the first base station to which the device 120 belongs (S611).

Here, the packet data network gateway 500 may maintain neighbor base station information of each base station based on network deployment information in which each base station is installed.

Thereafter, the packet data network gateway 500 analyzes the transmitted or received packet based on the address information of the IP packet routed and forwarded by the packet data network gateway 500 (S613).

The packet data network gateway 500 analyzes the packet transmitted or received in step 613 so that the source (the first device 110) and the destination (the second device 120) are provided to the device, respectively. It is determined whether or not it corresponds (S615)

If it is determined in step 615 that the source and the destination correspond to the device, the packet data network gateway 500 determines whether the base station of the source and the base station of the destination are located at or near the same (S617). .

In step 617, if the base station of the source and the base station of the destination are the same as the first base station 210, the packet data network gateway 500 transmits a D2D communication availability confirmation message to the first base station 210 ( S619).

Subsequently, when the D2D communication capable message is received from the first base station 210 (S621), the packet data network gateway 500 sends a D2D bearer creation request message to the mobility management device 300 based on the received D2D communication capable message. It transmits (S623).

The packet data network gateway 500 receives a D2D bearer creation response message corresponding to the D2D bearer creation request message from the mobility management device 300 (S625).

According to an embodiment of the present invention, the packet data network gateway 500 analyzes a packet transmitted or received based on the address information of an IP packet to determine whether the source and destination correspond to the device and the source and destination are the same. After determining whether it belongs to a base station or a neighboring base station, it has been described that subsequent steps (S619 to S625) including the step of transmitting a D2D communication availability confirmation request message to the base station, but another embodiment of the present invention In the case where the packet data network gateway 500 receives an IP CAN session change (Internet Protocol-Connectivity Access Network Session Modification) message from the policy management apparatus 600, the packet data network gateway 500 transmits a D2D communication availability check request message to the base station. Subsequent steps S619 to S625 that include, may then proceed.

7 (FIG. 7A and FIG. 7B) are flowcharts illustrating a method of initiating D2D communication according to another embodiment of the present invention.

Hereinafter, the third device 130 belongs to the first base station 210, the fourth device 140 belongs to the second base station 220, and the third device 130 and the fourth device 140 are connected to the wireless network. It is assumed that this corresponds to a neighboring device capable of communicating via.

Referring to FIG. 7, the method of initiating D2D communication according to an embodiment of the present invention begins with a D2D service request (S701).

Here, the D2D service request of step 701 is largely divided into a request by a device and a detection by a network.

First, when the third device 130 transmits a D2D service request message with the fourth device 140 to the application server 700 by the request by the device, the application server 700 sends a D2D service request message to the application server 700. 3 transmits session information of the device 130 to the policy management apparatus 600.

Thereafter, the D2D service request may be performed by the policy management apparatus 600 transmitting the IP-CAN session change message to the packet data network gateway 500.

Here, the third device 130 connected to the application server 700 may recognize a device located in its vicinity through an application that provides various location services and may attempt direct communication with the peripheral device.

Alternatively, the detection may be performed through a network. The D2D service request S701 through sensing by the network may be made through sensing by the network. Since the D2D service request through the detection by the network (S701) has been described in detail with reference to FIG. 6, it will be omitted below.

The packet data network gateway 500 transmits a request message for confirming availability of D2D communication based on the D2D service request through step 701 through the serving gateway 400 and the mobility management device 300 to the first base station 210 and the second base station. Each transmits to 220 (S703).

Thereafter, the first base station 210 transmits a D2D connection check request message to the third device 130 based on the received D2D communication availability confirmation request message (S705). In addition, the second base station 220 transmits a D2D connection check request message to the fourth device 140 based on the received D2D communication availability confirmation request message (S707).

In operation S709, the third device 130 and the fourth device 140 may check whether the D2D link may be established and the D2D execution intention check.

In this case, the D2D execution intention confirmation may be performed by a user's selection, and the D2D execution intention confirmation may be performed according to information preset in each of the third device 130 and the fourth device 140. have.

When the D2D link can be established through step 709 and the user confirms the intention to perform D2D communication, the third device 130 sends a D2D connection check response message to the first base station 210, and the fourth device 120 sends the D2D. The connection check response message is transmitted to the second base station 220, respectively (S711 and S713).

Subsequently, the first base station 210 and the second base station 220 determine whether the third device 130 and the fourth device 140 are capable of D2D communication based on the received D2D connection check response message, and then perform D2D communication. If possible, the D2D communication capable message is transmitted to the packet data network gateway 500, respectively (S715 and S717).

The packet data network gateway 500 transmits a D2D bearer generation request message to the mobility management device 300 based on the D2D communication capable message received from the first base station 210 and the second base station 220 ( S719).

Thereafter, the mobility management apparatus 300 receives the D2D bearer creation request message from the packet data network gateway 500 and transmits the D2D bearer setup request message and the session management request message to the first base station 210 and the second base station 220. In step S721.

The first base station 210 and the second base station 220, based on the D2D bearer setup request message and the session management request message received in step 721, the first base station 210 sends an RRC connection reconfiguration request message to the third device In operation S723, the second base station 220 transmits an RRC connection reconfiguration request message to the fourth device 140 in operation S725.

The third device 130 and the fourth device 140 respectively allocate radio resources to set up a D2D bearer, and set up a D2D radio link through the configured D2D bearer (S727).

When the D2D bearer is configured through the third device 130 in step 727, the RRC connection reconfiguration response message is transmitted to the first base station 210 (S729), and the fourth device 140 transmits the D2D bearer in step 727. If set, the RRC connection reconfiguration response message is transmitted to the second base station (S731).

Thereafter, the first base station 210 and the second base station 220 respectively transmit the D2D bearer establishment response message corresponding to the D2D bearer establishment request message to the mobility management device 300 based on the received RRC connection reconfiguration response message. (S733, S735).

When the RRC connection reconfiguration response message is received (S729 and S731), the first base station 210 transmits a D2D bearer activation request message to the third device 130 (S737), and the second base station 220 requests the D2D bearer activation. The message is transmitted to the fourth device 140 (S739).

The third device 130 and the fourth device 140 activate the D2D bearer based on the D2D bearer activation request message received through the steps 737 and 739, and transmit the D2D bearer activation response message to the first base station 210 and the second device 140. The second base station 220 transmits the data to the second base station 220 (S741 and S743).

The first base station 210 receives the D2D bearer activation response from the third device 130 and transmits a session management response message to the mobility management apparatus 300 (S745). The second base station 220 transmits the fourth device ( In step S747, the D2D bearer activation response is received from the 140, and the session management response message is transmitted to the mobility management device 300.

The mobility management apparatus 300 transmits a D2D bearer generation response message to the packet data network gateway 500 based on the session management response messages received through steps 745 and 747 (S749).

8 is a flowchart illustrating a temporary termination method of D2D communication according to another embodiment of the present invention.

Hereinafter, it is assumed that the first device 110 and the second device 120 connect to the first base station 210 and receive all the control necessary for the D2D communication from the first base station 210.

D2D communication termination method according to an embodiment of the present invention may be made through the transmission and reception of a message between the first device 110, the second device 120 and the first base station 210.

Specifically, the first base station 210 monitors the data transmission of the first device 110 and the second device 120, so that the direct communication between the first device 110 and the second device 120 for a preset time. When the data transmission is not detected, the RRC connection reconfiguration message is transmitted to the first device 110, and an RRC connection reconfiguration response message corresponding to the RRC connection reconfiguration message is received from the first device 110.

Referring to FIG. 8, when it is determined that there is no data transmission between the first device 110 and the second device 120 (S801), the first device 110 and the second device ( 120) RRC connection reconfiguration request message is transmitted to each (S803).

Here, the tentative termination means that the D2D communication is terminated without an explicit request from the device. If the base station determines that there is no data transmission for a preset time, the D2D service may be temporarily terminated.

In addition, in order for the first device 110 and the second device 120 to start the D2D data transmission, the resource allocation request should be requested to the first base station 210 before the D2D data transmission starts. When there is no resource allocation request from the device 110 and the second device 120, the first base station 210 may determine that there is no data transmission.

The RRC connection reconfiguration request message may include contents such as a D2D service stop (D2D service stop), a D2D link release, etc. for terminating the D2D service.

The first device 110 and the second device 120 receive an RRC connection reconfiguration request message from the first base station 210 through step 803 to release the D2D link (S805 and S807).

Thereafter, the first device 110 transmits an RRC connection reconfiguration response message corresponding to the RRC connection reconfiguration request message to the first base station 210 (S809), and the second device 120 corresponds to the RRC connection reconfiguration request message. The RRC connection reconfiguration response message is transmitted to the first base station 210 (S811).

9 is a flowchart illustrating a temporary termination method of D2D communication performed in a base station according to another embodiment of the present invention.

Referring to FIG. 9, the first base station 210 monitors data transmission of the first device 110 and the second device 120 (S901).

The first base station 210 determines whether there is no resource allocation request for a predetermined time or more from the first device 110 and / or the second device 120 (S903). It is determined that there is no data transmission between the first device 110 and the second device 120, and transmits an RRC connection reconfiguration request message to each of the first device 110 and the second device 120 (S905).

In this case, the RRC connection reconfiguration request message may include contents such as a D2D service stop (D2D service stop), D2D link release for the D2D service termination.

Thereafter, the first base station 210 receives an RRC connection reconfiguration response message from the first device 110 and the second device 120, respectively (S907).

FIG. 10 is a flowchart illustrating a temporary termination method of D2D communication between devices existing in a neighbor cell according to another embodiment of the present invention.

Hereinafter, the third device 130 connects to the first base station 210 and receives all the controls necessary for the D2D communication from the first base station 210, and the fourth device 140 connects to the second base station 220. Assume that all control necessary for D2D communication is received from the second base station 220.

Here, the temporary termination means that the D2D communication is terminated without an explicit request from the device. When the base station determines that there is no data transmission for a preset time, the base station may temporarily terminate the D2D service.

D2D communication termination method according to an embodiment of the present invention may be made through the transmission and reception of a message between the third device 130, the fourth device 140, the first base station 210 and the second base station 220.

Specifically, the first base station 210 monitors the data transmission of the third device 130 and the fourth device 140, so that the direct communication between the third device 130 and the fourth device 140 for a preset time. If the data transmission is not detected, the fourth device 140 transmits a D2D communication termination request message to the attached second base station 220 and transmits an RRC connection reconfiguration message to the third device 130, and the third device. Receive an RRC connection reconfiguration response message corresponding to the RRC connection reconfiguration message from 130 and receives a D2D communication termination response message corresponding to the D2D communication termination request message from the second base station 220.

The second base station 220 transmits the RRC reconfiguration message to the fourth device 140 based on the D2D communication termination request message received from the first base station 210 attached by the third device 130, and the fourth device 140. After receiving the RRC reconfiguration response message corresponding to the RRC reconfiguration message from 140, and transmits a D2D communication termination response message corresponding to the D2D communication termination request message to the first base station 210.

Hereinafter, a method of ending D2D communication according to an embodiment of the present invention.

Referring to FIG. 10, when it is determined that there is no data transmission between the third device 130 and the fourth device 140 (S1001), the first base station 210 transmits a D2D service termination request message to the second base station 220. S) (S1003).

In addition, the first base station 210 transmits an RRC connection reconfiguration request message to the third device 130 (S1005).

When the second base station 220 receives the D2D communication termination request message from the first base station 210 through step 1003, the second base station 220 transmits an RRC connection reconfiguration request message to the fourth device 140 (S1007).

When the RRC connection reconfiguration request mesh is received from the first base station 210 through step 1005, the third device 130 releases the D2D link (S1009).

In addition, when the RRC connection reconfiguration request message is received from the second base station 220 through step 1007, the fourth device 140 releases the D2D link (S1011).

Thereafter, the third device 130 transmits an RRC connection reconfiguration response message corresponding to the RRC connection reconfiguration request message to the first base station 210 (S1013), and the fourth device 140 corresponds to the RRC connection reconfiguration request message. The RRC connection reconfiguration response message is transmitted to the second base station 220 (S1015).

The second base station 220 receives the RRC connection reconfiguration response message from the fourth device 140 and transmits a D2D service end response message to the first base station 210 based on the received RRC connection reconfiguration response message (S1017). ).

FIG. 11 is a flowchart illustrating a method of temporarily terminating D2D communication between devices existing in a neighbor cell performed by a first base station according to another embodiment of the present invention.

Hereinafter, the third device 130 connects to the first base station 210 and receives all the controls necessary for the D2D communication from the first base station 210, and the first base station 210 communicates with the second base station 220. Assume that transmission and reception are possible.

Referring to FIG. 11, the first base station 210 monitors data transmission of the third device 130 and the fourth device 140 (S1101).

The first base station 210 determines whether there is no resource allocation request from the third device 130 and the fourth device 140 for a preset time during the data transmission monitoring of the third device 130 and the fourth device 140. (S1103), if there is no resource allocation request for a preset time, the second base station 220 transmits a D2D service termination request message (S1105).

In addition, when there is no resource allocation request for a predetermined time from the third device 130 and the fourth device 140, the first base station 210 transmits an RRC connection reconfiguration request message to the third device 130 ( S1107).

Here, steps 1105 and 1107 preferentially transmit the D2D service termination request message to the second base station 220 for convenience of description, but steps 1105 and 1107 may be performed in the reverse order and at the same time.

In addition, the RRC connection reconfiguration request message may include a D2D link release request between the third device 130 and the fourth device 140.

Thereafter, the first base station 210 receives an RRC connection reconfiguration response message from the third device 130 (S1109). In addition, the first base station 210 receives a D2D service end response message from the second base station 220 (S1111).

Here, in steps 1109 and 1111, the step of receiving the RRC connection reconfiguration response message from the third device 130 is preferentially performed for convenience of description, but steps 1009 and 1011 may be performed in the reverse order and at the same time.

12 is a flowchart illustrating a temporary termination method of device-to-device D2D communication existing in a neighbor cell performed by a second base station according to another embodiment of the present invention.

Hereinafter, the fourth device 140 is connected to the second base station 220 and receives all control necessary for D2D communication from the second base station 210, and the second base station 220 transmits and receives a message with the first base station 210. Assume this is possible.

Referring to FIG. 12, when the D2D service termination request message is received from the first base station 210 (S1201), the second base station 220 sends an RRC to the fourth device 140 based on the received D2D service termination request message. The connection reconfiguration request message is transmitted (S1203).

Here, the RRC connection reconfiguration request message may include a D2D link release request.

Subsequently, when the RRC connection reconfiguration response message is received from the fourth device 140 (S1205), the second base station 220 sends a D2D service termination response message to the first base station 210 based on the received RRC connection reconfiguration response message. It transmits (S1207).

13 is a flowchart illustrating an explicit termination method of D2D communication according to another embodiment of the present invention.

Here, explicit termination means that the device requests termination of the D2D service from the base station.

Specifically, when the first device 110 corresponds to at least one of data transmission completion, data transmission impossible, and data reception failure, the first device 110 determines that the D2D communication is terminated, and then the D2D communication termination request message to the first base station 210. And release the D2D link based on the RRC connection reconfiguration message received from the first base station 210 and then transmit an RRC connection reconfiguration response message to the first base station 210.

Referring to FIG. 13, when detecting the end of the D2D communication (S1301), the first device 110 transmits a D2D service termination request message to the first base station 210 (S1303).

In this case, the D2D communication is terminated when data transmission between the first device 110 and the second device 120 is completed, or the first device 110 and / or the second device 120 moves to a shaded area or the like. Can be detected when D2D communication is disabled.

When the first base station 210 receives the D2D service termination request message from the first device 110, the first base station 210 sends an RRC connection reconfiguration request message based on the received D2D service termination request message to the first device 110 and the second device ( 120) (S1305).

In operation 1305, the first device 110 and the second device 120 receiving the RRC connection reconfiguration request message release the D2D links (S1307 and S1309).

The first device 110 and the second device 120 that have completed the D2D link release in steps 1307 and 1309 transmit an RRC connection reconfiguration response message to the first base station 210, respectively (S1311 and S1313).

14 is a flowchart illustrating an explicit termination method of D2D communication performed in a device according to another embodiment of the present invention.

Referring to FIG. 14, the first device 110 determines whether an end of D2D communication with the second device 120 is detected (S1401).

In this case, when the D2D communication ends, data transmission between the first device 110 and the second device 120 is completed, or the first device 110 and / or the second device 120 moves to a shadow area or the like, and thus the D2D communication is performed. It can be detected if communication is not possible.

When the D2D communication end is detected through step 1301, the first device 110 transmits a D2D service end request message to the first base station 210 (S1403).

Subsequently, when the RRC connection reconfiguration request message is received from the first base station 210 (S1405), the first device 110 releases the D2D link based on the received RRC connection reconfiguration request message (S1407).

When the D2D link release is completed through step 1407, the first device 110 transmits an RRC connection reconfiguration response message to the first base station 210 (S1409).

15 is a flowchart illustrating a method for explicitly terminating D2D communication between devices existing in a neighbor cell according to another embodiment of the present invention.

Hereinafter, the third device 130 connects to the first base station 210 and receives all the controls necessary for the D2D communication from the first base station 210, and the fourth device 140 connects to the second base station 220. Assume that all control necessary for D2D communication is received from the second base station 220. In addition, it is assumed that the message transmission and reception between the first base station 210 and the second base station 220 is possible.

Specifically, the first base station 210 transmits a D2D service termination request message to the second base station 220 to which the fourth device 140 is attached based on the D2D service removal request message received from the third device 130. And sends an RRC connection reconfiguration message to the third device 130, receives an RRC connection reconfiguration response message corresponding to the RRC connection reconfiguration message from the third device 130, and receives a D2D service termination request message from the second base station 220. Receive the corresponding D2D service termination response message.

Referring to FIG. 15, when the third device 130 detects the termination of the D2D communication (S1501), the third device 130 transmits a D2D service termination request message to the first base station 210 (S1503).

Here, the termination of the D2D communication may be detected when data transmission between the third device 130 and the fourth device 140 is completed or when the fourth device 140 moves to a shaded area or the like, and the D2D communication becomes impossible. Can be.

When the D2D service termination request message is received from the third device 130, the first base station 210 transmits a D2D service termination request message to the second base station 220 based on the received D2D service termination request message (S1505). ).

In addition, the first base station 210 transmits an RRC connection reconfiguration request message to the third device 130 based on the received D2D service termination request message (S1507).

When the second base station 220 receives the D2D service termination request message from the first base station 210, the second base station 220 transmits an RRC connection reconfiguration request message to the fourth device 140 based on the received D2D service termination request message (S1509). ).

The third device 130 receiving the RRC connection reconfiguration request message from the first base station 110 through step 1507 and the fourth device 140 receiving the RRC connection reconfiguration request message from the second base station 120 through step 1509. ) Releases the D2D link (S1511, S1513).

After completing the D2D link release in step 1511, the third device 130 transmits an RRC connection reconfiguration response message to the first base station 210 (S1515), and completes the D2D link release in step 1513. 140 transmits an RRC connection reconfiguration response message to the second base station 220 (S1517).

Thereafter, the second base station 220 receives the RRC connection reconfiguration response message from the fourth device 140 and transmits a D2D service termination response message to the first base station 210 based on the received RRC connection reconfiguration response message ( S1519).

16 is a flowchart illustrating a method for explicitly terminating a D2D communication between devices existing in a neighbor cell performed by a first base station according to another embodiment of the present invention.

Referring to FIG. 16, the first base station 210 receives a D2D service termination request message from the third device 130 (S1601), and transmits a D2D service termination request message based on the received D2D service termination request message to the second base station 210. It transmits to the base station 220 (S1603).

In addition, the first base station 210 transmits an RRC connection reconfiguration response message to the third device 130 based on the D2D service termination request message received from the third device 130 (S1605).

Here, steps 1603 and 1605 preferentially transmit the D2D service termination request message to the second base station 220 for convenience of description, but steps 1603 and 1605 may be performed in the reverse order and at the same time.

Thereafter, the first base station 210 receives an RRC connection reconfiguration response message from the third device 130 (S1607), and receives a D2D service termination response message from the second base station 220 (S1609).

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims. It will be possible.

110: first device 120: second device
130: third device 140: fourth device
210: first base station 220: second base station
300: MME 400: S-GW
500: P-GW 600: PCRF
700: APP

Claims

In the method in which the device initiates D2D communication,
Checking whether the D2D link can be established based on the D2D connection check request message received from the base station;
If the D2D link establishment is possible, transmitting a D2D connection check response message to the base station;
Setting up a D2D bearer based on an RRC connection reconfiguration request message received from the base station and transmitting an RRC connection reconfiguration response message to the base station; And
Activating a D2D bearer based on the D2D bearer activation request message received from the base station and transmitting a D2D bearer activation response message to the base station.

The method according to claim 1,
D2D communication start method, before the step of checking whether the D2D link can be set,
And transmitting the D2D service request message to the network.

In the method for the base station to start the D2D communication,
Transmitting a D2D connection check request message to the first and second devices based on the D2D communication availability confirmation request message received from the gateway (GateWay) device;
Transmitting a D2D communication capable message to the gateway device when it is determined that D2D communication between the first and second devices is possible based on the D2D connection test response message received from the first and second devices;
Transmitting an RRC connection reconfiguration message to the first and second devices based on a bearer establishment request and a session management request message received from a mobility management entity (MME);
Transmitting a D2D bearer setup response message to the mobility management apparatus based on the RRC connection reconfiguration response messages received from the first and second devices;
Transmitting a D2D bearer activation request message to the first and second devices; And
And transmitting a session management response message to the mobility management device based on the D2D bearer activation response messages received from the first and second devices.

In the method (GateWay: GW) device to start D2D communication,
Transmitting a request message for confirming availability of D2D communication to a base station;
If a D2D communication enabled message is received from the base station, transmitting a D2D bearer creation request message to a mobility management entity (MME); And
Receiving a D2D bearer creation response message from the mobility management device.

The method of claim 4,
The step of transmitting the D2D communication availability confirmation request message to the base station,
Analyzing the packet based on the address information of the IP packet;
Analyzing the packet to determine whether each of a source and a destination corresponds to a device;
Determining if the base station of the first device and the base station of the second device are the same or adjacent if the source is the first device and the destination is the second device; And
When the base station of the first device and the base station of the second device is the same or located in the vicinity, if the D2D communication availability confirmation message of each of the first device and the second device, the base station of the first device and the second device D2D communication start method comprising the step of transmitting to at least one base station of the base station.

The method of claim 4,
Before the step of transmitting the D2D communication availability confirmation request message to the base station,
And receiving an Internet Protocol-Connectivity Access Network Session Modification message from a Policy and Charging Rule Function.

In the method of the base station terminates the D2D communication,
Monitoring data transmissions of the first and second devices;
If a direct data transmission between the first and second devices is not detected for a preset time, sending an RRC connection reconfiguration message to the first device; And
Receiving an RRC connection reconfiguration response message corresponding to the RRC connection reconfiguration message from the first device.

In the method for the device to terminate the D2D communication,
Determining whether to terminate D2D communication;
If it is determined that the D2D communication is terminated, transmitting a D2D communication termination request message to the base station; And
Releasing a D2D link based on an RRC connection reconfiguration message received from the base station, and transmitting an RRC connection reconfiguration response message to the base station.

The method according to claim 8,
Determining whether or not the D2D communication is terminated,
And determining that the D2D communication is terminated when at least one event of data transmission completion, data transmission failure, or data reception failure occurs.

On the basis of the D2D connection check request message received from the base station, confirming whether the D2D link can be established and the D2D communication execution intention, and confirming that the D2D link setting is possible and the D2D communication intention is determined, the D2D connection test response message is read. After transmitting to the base station, receiving the RRC connection reconfiguration request message from the base station to set up the D2D bearer and transmitting the RRC connection reconfiguration response message to the base station, and receives the D2D bearer activation request message from the base station to activate the D2D bearer Device that sends a D2D bearer activation response message.

The method of claim 10,
And the device transmits a D2D service request message to a network before receiving a D2D connection check request message from the base station.

The method of claim 10, wherein the device,
When at least one event occurs among data transmission completion, data transmission failure, and data reception failure while performing direct communication with the counterpart device, it is determined that the D2D communication has been terminated, and a D2D communication termination request message is transmitted to the base station. And transmitting a RRC connection reconfiguration response message to the base station after releasing a D2D link based on the RRC connection reconfiguration message received from the base station.

A D2D connection check request message is transmitted to the first and second devices based on the D2D communication capable confirmation request message received from a gateway (GW) device, and the D2D connection check response message received from the first and second devices. Based on the determination result, if it is determined that D2D communication between the first and second devices is possible, a D2D communication capable message is transmitted to the gateway device, and a bearer establishment request and session management request received from a mobility management entity. Send an RRC connection reconfiguration message to the first and second devices based on the message, and generate a D2D bearer setup response message based on an RRC connection reconfiguration response message received from the first and second devices. After transmitting to the mobility management device, a D2D bearer to the first and second devices A base station for transmitting an activation request message and transmitting a session management response message to the mobility management device based on the D2D bearer activation response messages received from the first and second devices.

The method of claim 13, wherein the base station,
Monitoring the data transmission of the first and second devices, and if a direct data transmission between the first device and the second device is not detected for a preset time, sending an RRC connection reconfiguration message to the first device; A base station for receiving an RRC connection reconfiguration response message corresponding to the RRC connection reconfiguration message from a first device.

After the D2D communication availability confirmation request message is transmitted to the base station, when the D2D communication enabled message is received from the base station, the D2D bearer creation request message is transmitted to the mobility management entity, and the D2D bearer from the mobility management device. D2D connection controller that receives a generation response message.

The method according to claim 15,
The D2D connection controller analyzes the packet based on the address information of the IP packet, and if the source and destination are devices, and if the base stations of the two devices are the same or located in the vicinity, whether the D2D communication is possible. D2D connection control device for transmitting a message to the base station.

The method according to claim 15,
Sending the D2D communication availability confirmation request message to the base station,
D2D connection control device for transmitting the D2D communication availability check request message to the base station based on the IP-CAN session change (Internet Protocol-Connectivity Access Network Session Modification) message received from the policy and Charging Rule Function.

The method according to claim 15,
The D2D connection controller is a packet data network gateway (P-GW) D2D connection controller.