WO2013064121A1

WO2013064121A1 - Method, device and system for establishing device-to-device connection

Info

Publication number: WO2013064121A1
Application number: PCT/CN2012/084088
Authority: WO
Inventors: 周卫华; 吴晓波; 梅里奥⋅劳伦斯
Original assignee: 华为技术有限公司
Priority date: 2011-11-03
Filing date: 2012-11-05
Publication date: 2013-05-10
Also published as: CN103096290B; CN103096290A

Abstract

Disclosed are a method, device and system for establishing a device-to-device connection, belonging to the technical field of communications. The method includes: a device-to-device (D2D) server acquiring register information about a first device which requires to perform D2D communication; performing pre-matching on the first device to find a second device according to the register information about the first device; respectively initiating a communication beginning request toward the first device and the second device, and triggering the first device and the second device to establish a D2D communication link between the first device and the second device through an MME and an evolved NodeB (eNB) to which they belong respectively. In the present invention, a D2D connection is established between two devices by triggering an eNB by an MME to which UE belongs, so that the establishment and use of a connection between two devices can be controlled by the network, thus realizing control, management, charging, etc. of D2D by the operators, and being able to control the interference to the ordinary UE by D2D.

Description

Method, device and system for establishing device-to-device connection The present application claims to be submitted to the Chinese Patent Office on November 3, 2011, the application number is 201110343964.2, and the invention is entitled "Methods, devices and systems for establishing device-to-device connection," The present application relates to the field of communications technologies, and in particular, to a method, apparatus and system for establishing a device-to-device connection.

Background technique

D2D (Device-to-Device) technology enables direct data transfer and exchange between two devices. Currently, there are a variety of technologies that can support D2D communication, such as Bluetooth, Ultra Wide Band Technology (UWB) and other technologies.

The method for communicating between the D2Ds through the wireless network mainly includes: One device in the D2D device broadcasts a character string to facilitate another device in the D2D device to understand its identity characteristics, application services, and broadcast content. After receiving the string, the user of another device in the D2D device sends "paging" signaling to a device in the D2D device if it matches the user's own interest and wants to obtain more detailed information. After receiving one device in the D2D device, it directly establishes a connection with another device in the D2D device. After the communication link between the two devices is successfully established, data transmission can be performed.

The D2D device has the function of cognitive communication wireless resources, that is, autonomously feels the external environment, and performs independent resource management and configuration according to the recognized result, and establishment and management of D2D links between devices, without network control. And allocation, however, when congestion occurs in the network, it affects the data transmission between D2D devices. SUMMARY OF THE INVENTION The present invention provides a method, apparatus, and system for establishing a device-to-device connection for enabling network control and resource management for D2D communication.

In one aspect, a method for establishing a device-to-device D2D connection is provided, the method comprising: a device-to-device D2D server acquiring registration information of a first device that needs to perform D2D communication;

The D2D server performs pre-matching on the first device to find a second device according to the registration information of the first device, where the first device and the second device are two devices for D2D communication; Initiating a D2D communication start request to the first device and the second device, triggering the first device and the second device to respectively pass their MME (Mobility Management Entity) and eNB (evolved Node Base) , an evolved base station), establishing a D2D communication link between the first device and the second device.

In one aspect, a method for establishing a device-to-device D2D connection is provided, the method comprising: the evolved base station eNB receiving a bearer setup or modification sent by a first device in the device to the device D2D through a mobility management entity MME to which it belongs a request message, the bearer setup or modify request message includes an identifier of the first device and the second device, where the bearer setup or bearer modification message indicates that the first device and the second device use the D2D communication The link carries a service flow that is communicated by the first device and the second device; the first device and the second device are two devices of D2D communication;

The eNB binds the first device and the second device according to the identifiers of the first device and the second device, and establishes a D2D communication chain between the first device and the second device. road.

In one aspect, a method for establishing a device-to-device D2D connection is also provided, the method comprising: The first device in the D2D communication sends the registration information to the D2D server, so that the D2D server performs pre-matching on the first device according to the registration information to find the second device in the D2D communication, to the first device. Said second device sends a communication start request;

Receiving a communication start request sent by the D2D server, and establishing, by the mobility management entity MME and the evolved base station eNB, a D2D communication link between the first device and the second device.

On the other hand, a device-to-device D2D server is provided, the server includes: an obtaining module, configured to acquire registration information of a first device that needs to perform D2D communication; and a pre-matching module, configured to acquire according to the acquiring module The registration information of the first device, performing pre-matching on the first device to find a second device; the first device and the second device are two devices in D2D communication;

a triggering module, configured to initiate a D2D communication start request to the first device and the second device, respectively, after the pre-matching module finds the second device, triggering the first device and the second device respectively A D2D communication link is established between the first device and the second device by the mobility management entity MME and the evolved base station eNB to which the UE belongs.

In another aspect, an evolved base station eNB is provided, where the base station includes:

a transmission module, configured to receive a bearer setup or modify request message sent by the first device in the device to the device D2D by the mobility management entity MME to which the device belongs, where the bearer setup or modify request message includes the first device and the second device An identifier of the device, where the bearer setup or bearer modification message indicates that the first device and the second device use the communication link of the D2D to carry a service flow that is communicated by the first device and the second device; The first device and the second device are two devices for D2D communication;

a processing module, configured to bind the first device and the second device according to the identifiers of the first device and the second device, and establish a D2D between the first device and the second device Communication link.

In another aspect, a first device in a D2D is provided, the device comprising: a transmission module, configured to send registration information to the D2D server, to enable the D2D server to perform pre-matching on the first device according to the registration information, to find a second device in the D2D communication, to the first device The second device sends a communication start request;

The learning module is configured to receive a communication start request sent by the D2D server, and establish a D2D communication link between the first device and the second device by the mobility management entity MME and the evolved base station eNB.

In another aspect, there is also provided a system for establishing a device-to-device D2D connection, the system comprising: a D2D server as described above, an eNB as described above, and a first device and a second device in the D2D as described above .

An embodiment of the present invention provides a method for establishing a device-to-device D2D connection, where the D2D server obtains registration information of a first device that needs to perform D2D communication, and the D2D server performs, according to the registration information of the first device, the The first device performs pre-matching to find a second device, where the first device and the second device are two devices in the D2D, and the D2D server initiates a D2D communication start request to the first device and the second device, respectively. The first device and the second device are triggered to establish a D2D communication link between the first device and the second device by using the mobility management entity MME and the evolved base station eNB. The D2D connection can be established between the two devices, so that the network can be controlled, and the operator can effectively control, manage, or charge the D2D communication, and at the same time, after establishing the D2D connection, compared with the prior art, Since the network can be effectively controlled, the interference caused by the D2D communication to the UE can be further eliminated.

BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. Obviously, the drawings in the following description are only some of the present invention. Embodiments, for those of ordinary skill in the art, without creativity Other drawings can also be obtained from these drawings on the premise of labor.

1 is a flowchart of a method for establishing a D2D connection according to an embodiment of the present invention; FIG. 2 is a flowchart of a method for establishing a D2D connection according to an embodiment of the present invention; A flowchart of a method for establishing a D2D connection is provided. FIG. 4 is a schematic diagram of a network architecture provided in an embodiment of the present invention;

FIG. 5 is a flowchart of a method for establishing a D2D connection according to an embodiment of the present invention; FIG. 6 is a flow chart of a message for establishing a D2D connection according to an embodiment of the present invention; FIG. a schematic diagram of a D2D server;

FIG. 8 is a schematic diagram of another D2D server provided in the embodiment of the present invention; FIG. 9 is a schematic diagram of an evolved base station according to an embodiment of the present invention;

FIG. 10 is a schematic diagram of a first device in a D2D according to an embodiment of the present invention; FIG. 11 is a schematic diagram of a first device in another D2D provided in an embodiment of the present invention; A schematic diagram of a system for establishing a D2D connection is provided.

The present invention will be further described in detail with reference to the accompanying drawings, in which FIG. An embodiment. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without departing from the inventive scope are the scope of the present invention.

The existing network includes a first device, a second device, a third device, and a base station, where the first device and the second device establish a connection autonomously, and perform autonomous management and configuration on the perceived wireless resource, so that the network does not need the wireless resource. Control and allocation, because there is no authentication and authentication of the operating network, no rational allocation of resources, and interference control mechanisms, so congestion in the network will affect the transmission of data. For example, when the first device and the second device transmit data, the base station is received. The communication with the first device, or the communication between the base station and the second device, or the communication between the base station and the third device, or the interference between the first device and the third device, affects the communication quality of the network.

In order to solve the above problems, the present invention provides the following technical solutions:

Referring to FIG. 2, this embodiment provides a method for establishing a device-to-device D2D connection, including:

101: device to device D2D server acquires registration information of the first device that needs to perform D2D communication;

102: The D2D server performs pre-matching on the first device to find a second device according to the registration information of the first device, where the first device and the second device are two devices for D2D communication;

103: The D2D server initiates a D2D communication start request to the first device and the second device, respectively, and triggers the first device and the second device to respectively pass the MME and the eNB to which the MME and the eNB belong. A D2D communication link is established between the device and the second device.

The method in this embodiment further includes:

The D2D server receives device registration information that requires D2D communication, and the device registration information includes: a D2D identifier of the device, an application identifier, and location information of the device.

In this embodiment, optionally, if the registration information of the first device further includes application related information of the first device, the first device according to the registration information of the first device Perform a pre-match to find the second device, including:

Obtaining registration information of the pre-storage device according to the location information in the first device registration information, where a distance between the pre-storage device and the first device is within a preset range;

If the information related to the application of one of the pre-storage devices is consistent with the information related to the application of the first device, it is confirmed that one of the pre-storage devices is a pre-matched second device.

Optionally, in this embodiment, if the registration information of the first device acquired by the device to the device D2D server further includes the identifier of the second device, according to the registration of the first device Information, performing pre-matching on the first device to find the second device includes:

Performing a pre-match on the first device to find the second device according to the identifier of the second device.

Optionally, in this embodiment, after performing the pre-matching on the first device to find the second device according to the registration information of the first device, the method further includes:

The D2D server sends the registration information of the second device to the first device, so that the first device performs pre-detection on the second device according to the registration information of the second device; As a result of the successful pre-detection of a device, it is confirmed according to the pre-detection result whether the second device can communicate with the first device.

Further, optionally, after the D2D server receives the result of the pre-detection success of the first device, and confirms that the second device can communicate with the first device, the method further includes:

The D2D server sends the registration information of the first device to the second device, so that the second device performs pre-detection on the first device according to the registration information of the first device; the D2D server Receiving a result of successful pre-detection of the second device, confirming whether the first device is capable of communicating with the second device.

In this embodiment, the D2D server sends a D2D communication start request to the first device and the second device respectively, including:

The D2D server initiates a D2D bearer setup or modify request message to the first device and the second device, where the bearer setup or modify request message includes the identifiers of the first device and the second device, and the service quality of the D2D bearer. Qos parameters.

In this embodiment, the D2D server initiates a D2D communication start request to the first device and the second device, respectively, and triggers the first device and the second device to respectively pass the mobility management entity MME and the eNB to which they belong. The type of base station eNB, establishing a D2D communication link between the first device and the second device, includes:

The D2D server initiates D2D bearer construction to the first device and the second device, respectively. Sending a request message, triggering the first device and the second device to send a bearer resource command message by using an MME, a SGW (Serving Gateway), and a PGW (Public Data Network Gateway) The bearer resource command message carries the identifiers of the first device and the second device, and the first device and the second device respectively send a bearer setup or modify request message to the evolved base station eNB by the PGW, the SGW, and the MME to which the first device and the second device belong. The bearer setup or modify request message carries the identifiers of the first device and the second device, so that the eNB performs the first device and the second device according to the identifiers of the first device and the second device. Binding, establishing a communication link of the D2D between the first device and the second device.

The method of the present invention provides the following steps: The D2D server obtains registration information of the first device that needs to perform D2D communication, and the D2D server performs pre-processing on the first device according to the registration information of the first device. Matching to find the second device, the first device and the second device are two devices in the D2D, and the D2D server respectively initiates a D2D communication start request to the first device and the second device, triggering the first A device and the second device respectively establish a D2D communication link between the first device and the second device by using the mobility management entity MME and the evolved base station eNB, so that two devices can be established. The D2D connection enables the network to be controlled, enabling the operator to effectively control, manage, or bill the D2D communication. At the same time, compared with the prior art, after the D2D connection is established, the network can be effectively controlled. Further, the interference caused by the D2D communication to the UE can be eliminated. Referring to FIG. 2, this embodiment provides a method for establishing a device-to-device D2D connection, including:

201: The evolved base station eNB receives a bearer setup or modify request message sent by the first device in the device to the device D2D through the MME to which the device belongs, where the bearer setup or modify request message includes the identifiers of the first device and the second device. The bearer setup or bearer modification message instructs the first device and the second device to use the D2D communication link to carry a service flow that is communicated by the first device and the second device; And the second device is two of D2D communication Equipment

202: The eNB binds the first device and the second device according to the identifiers of the first device and the second device, and establishes a D2D between the first device and the second device. Communication link.

In this embodiment, the eNB receiving the bearer setup or modification request message sent by the first device in the D2D through the MME to which the eNB belongs includes:

Receiving a bearer setup or modify request message sent by the first device in the D2D by the MME to which the MME is located, where the bearer setup or modify request message carries the identifiers of the first device and the second device, so as to be public data that belongs to the first device. The network gateway PGW, the serving gateway SGW, and the mobility management entity MME and the PGW, the SGW, and the MME to which the second device belongs, according to the identifiers of the first device and the second device, the first device and the The second device performs binding, and establishes a D2D communication link between the first device and the second device.

The D2D server initiates a D2D communication start request to the first device and the second device, respectively, and triggers the first device and the second device to respectively belong to the D2D server. The mobility management entity MME and the evolved base station eNB establish a D2D communication link between the first device and the second device, so that a D2D connection can be established between the two devices, thereby enabling the network to be controlled and operating. The quotient can effectively control, manage, or charge D2D communication. At the same time, compared with the prior art, after establishing a D2D connection, the network can be effectively controlled, and the interference caused by the D2D communication to the UE can be further eliminated. . Referring to FIG. 3, this embodiment provides a method for establishing a device-to-device D2D connection, including:

301: The first device in the D2D communication sends the registration information to the D2D server, so that the D2D server performs pre-matching on the first device according to the registration information to find the second device in the D2D communication;

302: Receive a communication start request sent by the D2D server, by using a mobile tube to which it belongs The physical entity MME and the evolved base station eNB establish a D2D communication link between the first device and the second device.

In this embodiment, the registration information includes: a D2D identifier of the device, an application identifier, and location information of the device.

Optionally, in this embodiment, after the first device sends the registration information to the D2D server, the method further includes:

Receiving, by the first device, registration information of the second device that is sent by the D2D server; the first device performing pre-detection on the second device according to the registration information of the second device, to confirm the second device Whether communication with the first device is possible.

In this embodiment, the receiving the communication start request sent by the D2D server includes: receiving a D2D bearer setup or modify request message initiated by the D2D server, where the bearer setup or modify request message includes a first device and a second device. The identity and quality of service Qos parameters carried by the D2D.

In this embodiment, the receiving the communication start request sent by the D2D server, and establishing a D2D communication link between the first device and the second device by using the MME and the eNB to which the MME and the eNB belong, include:

And receiving a communication start request sent by the D2D server, and sending, by the MME, the serving gateway SGW, and the public data network gateway PGW, the bearer resource command message, where the bearer resource command message carries the identifiers of the first device and the second device And the first device and the second device respectively send a bearer setup or modify request message to the eNB by the PGW, the SGW, and the MME to which the eNB belongs, where the bearer setup or modify request message carries the first device and the second device. And the eNB is configured to bind the first device and the second device according to the identifiers of the first device and the second device, and establish a D2D between the first device and the second device. Communication link.

The beneficial effects of the embodiment provided by the present invention are: acquiring, by the device to the device D2D server, registration information of the first device that needs to perform D2D communication, the D2D server according to the first The registration information of the device, performing pre-matching on the first device to find a second device, where the D2D server initiates a D2D communication start request to the first device and the second device, respectively, triggering the first device and the device The second device establishes a D2D communication link between the first device and the second device by using the MME and the eNB, so that a D2D connection can be established between the two devices, so that the network is controlled and implemented. The operator can effectively control, manage or charge the D2D communication. At the same time, compared with the prior art, after the D2D connection is established, the network can be effectively controlled, and the D2D communication can be eliminated to the UE. Interference. This embodiment provides a method for establishing a device-to-device connection. In this embodiment, an existing network specification is reused as much as possible. Based on the method, a complete D2D solution, including an application layer, a network layer, and an access network is constructed. The D2D solution can support D2D operation modes for operators, such as supporting operators' release, control, interference control, and billing for various D2D applications. Referring to the network architecture shown in FIG. 4, in the architecture, a D2D server is configured in the network for registration of D2D information by UEs wishing to communicate using D2D. The D2D server in this embodiment may be a newly added server in the network, or may be extended to implement the function of the existing server in the network to implement the function of the D2D server, which is not specifically limited in this embodiment. According to the D2D information registered by one UE, the D2D server performs pre-matching to find another UE that may perform D2D communication with the UE, and the two UEs that may communicate with each other sequentially trigger the SGW and the PGW through the MME to which the UE belongs, and finally establish a D2D bearer establishment. The modification request is sent to the eNB, and the eNB controls the related UE to perform measurement, discovery, and D2D link establishment according to the bearer setup/modification request for the D2D UE from the network.

Referring to FIG. 5, a method for establishing a device-to-device connection according to an embodiment of the present invention includes:

401: The first device that needs to perform D2D communication registers its information on the D2D server. In this embodiment, the device that needs to perform D2D communication registers its own information to the D2D server, so that the D2D server issues its D2D information on the network. In this embodiment, optionally, if the UE can monitor the presence of the surrounding D2D UE and some application related information, such as the D2D ID (D2D ID), the APP ID (Application IDentity, application identifier) of the UE, etc., the UE monitors. The surrounding D2D UE obtains information of the surrounding D2D UE, and the information of the surrounding D2D UE can be used for pre-matching of the D2D server. However, in actual applications, some UEs do not have a listening function, and the UE that does not have the monitoring function does not need to perform the step of acquiring related information of the surrounding D2D UE.

In this embodiment, the D2D server configured in the network is used for registration of D2D information by UEs that wish to communicate using D2D, and the D2D server maintains D2D information registered by all UEs. The registered information includes at least: the device's D2D ID, application ID, and device location information.

In this embodiment, the D2D ID of the UE may be: 1) a newly defined identifier, each UE supporting D2D communication is assigned a unique identifier; or 2) the IMSI may be used as the D2D ID; or 3) The SIP URI (IP Uniform Resource Identifier, SIP identifier) can be reused; or 4) the specific identifier that can be assigned to the UE by the network, such as S-TMSK S-TMSI S-Temporary Mobile Subscriber Identity, S Temporary Mobile User Identifier) , P-TMSI (Packet Temporary Mobile Subscriber Identity), GUTI (Globally Unique Temporary Identity), and so on. The location information of the UE includes the cell ID of the UE, or if the UE can obtain its own GPS (Global Positioning System) information, the location information of the UE also includes the GPS of the UE.

Further, optionally, the registration information may further include at least one of the following information, but is not limited thereto:

1) The identity of the target UE: If the UE has an explicit D2D communication target UE, the UE may also issue the identity of the target UE to the D2D server;

2) the IP address of the UE for D2D communication;

3) application-related information, such as the name or abstract of the advertisement that you wish to send/receive, the name of the game you wish to play, etc., and other information needed to establish a D2D link in the future, such as selected Media type, video encoding format, and QoS parameters;

4) Information for UE pre-detection, such information can assist the UE to perform pre-detection on the target UE for D2D communication, and determine whether the air link quality can support D2D communication, and reduce the possibility of D2D bearer establishment failure. Sex

5) Pre-monitored UE list, where the registration information of the surrounding D2D UE monitored by the UE is stored in the list. If the UE can use other mechanisms, such as listening to D2D broadcast information sent by other UEs, it is found that the surrounding is available. For the D2D UE, the UE can also publish these UEs to the D2D server.

402: Based on the information registered by the first UE, the D2D server performs pre-matching on the first UE, and discovers a second UE that may be in D2D communication with the D2D.

In this embodiment, based on the D2D information registered by the first UE, such as the application related information and the location information of the first UE, the D2D server performs pre-matching on the first UE, and discovers the second UE that may be in D2D communication with the D2D server. The eligible second UE should first be close in position, such as having the same cell ID; secondly, the eligible second UE should be interested in the same application, such as selecting the same game or the like. Therefore, performing the pre-matching of the first device to find the second device according to the registration information of the first device, the method includes: acquiring, according to the location information in the first device registration information, registration information of the pre-storage device, where The distance between the pre-storage device and the first device is within a preset range; if information related to an application of one of the pre-storage devices is consistent with information related to an application of the first device; One of the pre-storage devices is a pre-matched second device. In this embodiment, the pre-storage device may be one or more, which is not specifically limited in this embodiment.

Optionally, in this embodiment, if the first UE has an explicit D2D communication target device, the identifier of the target device is included in the registration information of the UE, and is registered together with the D2D server, where the UE needs to perform During D2D communication, the D2D server can directly select the UE according to the identity of the target terminal. If the UE provides a candidate D2D UE list, the D2D server only needs to perform pre-matching according to the UEs in the list. So optionally, according to the registration of the first device And performing the pre-matching to the first device to find the second device, including: performing pre-matching on the first device to find the second device according to the identifier of the second device. In this embodiment,

The D2D server pre-matches the first UE to the second UE.

403: Perform pre-detection between the first UE and the second UE.

In this embodiment, the D2D server performs pre-matching for a certain UE to obtain a UE that is likely to perform D2D communication. If the D2D server performs pre-matching for the first UE, it is found that the second UE can serve as a candidate D2D UE of the first UE. The D2D server initiates an acknowledgment process, and sends the pre-matched registration information of the second UE to the first UE. The first UE performs pre-detection on the second UE according to the registration information of the second UE, and confirms whether the second UE can perform D2D with the second UE. Communication. The registration information carries information for pre-detection, as well as D2D ID, location information, and so on.

In this embodiment, after the D2D server performs pre-matching for the second UE, it is possible to discover multiple candidate D2D UEs. At this time, the D2D server may select one or more of them, or sequentially or in parallel to perform the confirmation process, which is not specifically limited in this embodiment.

In this embodiment, after receiving the indication of the candidate D2D UE from the D2D server, if the message carries the pre-detection information of the UE, the first UE performs pre-detection using the information, and determines whether the UE can be associated with the UE according to the pre-detected information. Perform D2D communication. If the UE cannot be monitored at all, it indicates that D2D communication cannot be performed with the UE. If the message from the D2D server does not carry the pre-detection information of the UE, or the current UE does not support the pre-detection function, the UE skips the pre-detection step and directly judges according to other information from the D2D server, such as Location information or the like, to estimate whether the second UE can communicate with the first UE.

In this embodiment, after performing the pre-detection, the first UE feeds back the acknowledgment message for the candidate D2D UE to the D2D server, such as whether the UE recommended by the D2D server is optional. Further, the first UE may also update its D2D information, such as location, etc., to the D2D server.

In this embodiment, if the first UE confirms to the D2D server that the second UE can perform D2D communication, the D2D server may initiate the same UE acknowledgement procedure to the second UE to request the second UE to confirm whether the first UE is optional. The main purpose is to avoid the possibility of subsequent D2D bearer establishment failure. For example, for the interference-based reason, even if the first UE can detect the second UE, the second UE may not always be able to detect the first UE. The specific confirmation process is the same as the confirmation process of the first UE, and the details are not described in this embodiment.

It should be noted that step 403 is optional, and the D2D server may also initiate step 404 based only on its own pre-matched result.

404: After receiving the pre-detection success result fed back by the first UE and the second UE, the D2D server separately initiates a D2D communication start request to the first UE and the second UE.

In this embodiment, after the D2D server receives the acknowledgement message from the first UE and the second UE, it indicates that the first UE and the second UE can use the D2D communication. The D2D server initiates a D2D communication start request message to the first UE and the second UE, respectively, to instruct the first UE and the second UE to initiate a bearer setup/modification procedure to trigger establishment of a D2D link between the first UE and the second UE. The bearer setup/modification message includes an identifier of the first device and the second device and a quality of service Qos parameter of the D2D bearer.

405: The first UE and the second UE establish a direct D2D communication link between the first UE and the second UE by using the MM and the eNB to which the first UE and the second UE respectively belong.

In this embodiment, referring to FIG. 6, the first UE and the second UE respectively establish a direct D2D communication link between the first UE and the second UE by using the MME to which the MME belongs, including:

1) The first UE and the second UE send a bearer resource modification request message to their respective MMEs. In this embodiment, after receiving the D2D link setup indication message from the D2D server, the first UE and the second UE send a bearer resource setup or modify request message to their respective MMEs to trigger the eNB as the first UE and the second UE. The UE establishes a D2D link. This message requires enhancements to the following message content, but is not limited to these enhancements:

a) The D2D ID of the two UEs. In this embodiment, the MME obtains the IMSI corresponding to the D2D ID from the Home Subscriber Server (HSS), and uses the IMSI as a procedure and a message in the following. D2D ID.

b) D2D Indication, used to indicate that the MME is a D2D link between the starting UEs And trigger.

In this embodiment, the presence of the D2D ID of the two UEs indicates that the message is for the D2D bearer, so the D2D Indication information may not be included in the message.

2) Each MME to which the £1 belongs belongs to the bearer resource command message sent to the SGW to which the UE belongs. In this embodiment, the MME to which the first UE belongs sends a Bearer Resource Command message to the SGW to which the first UE belongs, and the message carries the D2D ID and the D2D Indication of the two UEs, and the MME to which the second UE belongs. A bearer resource command message is sent to the SGW to which the second UE belongs.

3) The SGW to which each UE belongs continues to forward the bearer resource command message to the PGW to which the UE belongs.

4) The PGW to which each UE belongs sends a Create Bearer Request or a Bearer Modify Request to the SGW to which each UE belongs, and carries the D2D Indication and the D2D IDs of the two UEs.

In this embodiment, the PGW to which the first UE and the second UE belong receives the bearer resource command message, and sends a bearer creation message or a bearer modification message to the SGW to which the UE belongs, and the create/modify bearer message indicates that the UE uses the D2D chain. The way to carry the traffic that matches the TFT in the message.

Optionally, in this embodiment, if the PCRF is configured in the network, before the PGW to which the UE belongs sends the bearer creation message or the bearer modification message to the SGW to which the UE belongs, the method further includes: the PCRF to which the UE belongs to the PCRF to which each UE belongs Interactive policy and charging control messages.

5) The SGW to which each UE belongs continues to forward the bearer creation message or the bearer modification message to the MME to which the UE belongs.

6) The MME to which each UE belongs sends a bearer creation message or a bearer modification message to the eNB. In this example, if the eNB receives the Bearer Setup for the first UE from the MME

The Request/Bearer Modify Request message carries the D2D Indication and the D2D ID of the two UEs, and the eNB knows that the message request is to establish a D2D bearing for the current first UE and another UE. Loaded. However, the eNB cannot find its context based on the D2D ID of another UE. The eNB then suspends the processing of the message, and waits for the Bearer Setup Request/Bearer Modify Request message of the D2D ID of the same UE to be sent to the other UE. In this embodiment, it is the second UE. When receiving the message for the second UE, the eNB binds two UEs related to two messages carrying the same D2D ID to initiate a subsequent D2D link establishment procedure.

It should be noted that, in this embodiment, if the eNB can identify the D2D ID of another UE, and the D2D ID finds its corresponding registration information. For example, when the C-RNTI (Cell Radio Network Temporary Identifier) is used for the D2D ID, the eNB can identify the C-RNTI and find the context corresponding to the UE according to the eNB, and the eNB does not need to wait for the second Bearer Setup. The arrival of the Request/Bearer Modify Request message may first bind the two D2D UEs.

In this embodiment, after the eNB completes the binding of the D2D UE, the two UEs may be controlled to perform mutual discovery, such as configuring one UE to send specific information on a certain physical resource, and configuring another UE to perform the same physical resource. Monitor this information. If the UE can successfully listen to information sent by another UE, it indicates that the two UEs can perform D2D communication. Then, the eNB configures D2D link related information, such as the ID of the D2D link, related physical resources, and the like, for the two UEs. After the D2D link is established, the two UEs will use the D2D link to send a specific handshake message to each other to confirm that the D2D link is working properly. After the D2D link setup process ends, the eNB feeds back the D2D bearer setup result to the MME. If the D2D bearer is successfully established or not, the MME, the SGW, the PGW, and the PCRF sequentially feed back the message to the D2D server. In this embodiment, if the UE transitions from the D2D mode to the normal mode, the eNB also informs the current mode of the EPC network UE.

It should be noted that, if the D2D link is not successfully established, the eNB may continue to establish a normal cell bearer for the two UEs to ensure that the communication between the UEs can be normally performed through the cell mode.

In addition, since the UE AS (Access Stratum) layer can perceive the establishment of the D2D service, the UE AS layer notifies the UE NAS layer, UE NAS (Non-Access-Stratum, non-access) The layer) layer can inform the EPC network that the UE is communicating using the D2D mode. Similarly, if the UE transitions from the D2D mode to the normal mode, the UE NAS layer also informs the EPC network UE of the current mode.

In this embodiment, after the D2D link is successfully established, the two UEs can communicate using D2D. If the D2D link is not successfully established, the cell mode can be used for communication.

In this embodiment, the D2D Indication, the D2D ID of the two D2D UEs may be enhanced support on the following interface, the bearer resource modification request message between the UE and the MME; the resource command message is carried on the S11 interface between the MME and the SGW, And a bearer setup/modification request message; a bearer resource command message on the S5/S8 interface between the PGW and the SGW, and a bearer setup/modification request message; a bearer setup/modification request message on the S1 interface between the MME and the eNB.

The method of the present invention provides the following steps: The D2D server obtains registration information of the first device that needs to perform D2D communication, and the D2D server performs pre-processing on the first device according to the registration information of the first device. Matching to find the second device, the first device and the second device are two devices in the D2D, and the D2D server respectively initiates a D2D communication start request to the first device and the second device, triggering the first A device and the second device respectively establish a D2D communication link between the first device and the second device by the mobility management entity MME and the evolved base station eNB. The D2D connection can be established between the two devices, so that the network can be controlled, and the operator can effectively control, manage, or charge the D2D communication, and at the same time, after establishing the D2D connection, compared with the prior art, Since the network can be effectively controlled, the interference caused by the D2D communication to the UE can be further eliminated. Moreover, after the D2D server finds two devices that can perform D2D connection, it first triggers pre-detection between the two devices to further determine whether communication between the two devices is possible, and if the communication can be triggered, the eNB is triggered again on the two devices. Direct device-to-device connection is established. Otherwise, the D2D server can select other devices for pre-detection to reduce the workload of the network and improve network efficiency. Referring to FIG. 7, the embodiment provides a device-to-device D2D server, including: an obtaining module 501, a pre-matching module 502, and a triggering module 503.

The obtaining module 501 is configured to obtain registration information of the first device that needs to perform D2D communication, and the pre-matching module 502 is configured to perform pre-matching on the first device to find the second device according to the registration information of the first device. The first device and the second device are two devices for D2D communication;

The triggering module 503 is configured to initiate a D2D communication start request to the first device and the second device, respectively, to trigger the first device and the second device to pass through the MME and the evolved base station eNB respectively. Establishing a D2D communication link between the first device and the second device.

Referring to FIG. 8, the server in this embodiment further includes:

The transmission module 504 is configured to receive device registration information that needs to perform D2D communication, where the device registration information includes: a D2D identifier of the device, an application identifier, and location information of the device.

Optionally, in this embodiment, the registration information of the first device acquired by the acquiring module further includes application related information of the first device;

The pre-matching module 502 is specifically configured to acquire registration information of the pre-storage device according to the location information of the first device, where a distance between the pre-storage device and the first device is within a preset range, if If the application-related information of one device in the pre-storage device is consistent with the information about the application of the first device, it is confirmed that one of the pre-storage devices is a pre-matched second device.

Optionally, the registration information of the first device acquired by the acquiring module further includes an identifier of the second device;

The pre-matching module is specifically configured to perform pre-matching on the first device to find the second device according to the identifier of the second device.

Optionally, in this embodiment, the transmitting module 504 is further configured to send the registration information of the second device to the first device, so that the first device is configured according to the registration information sent by the transmission module. The second device performs pre-detection; The transmission module 504 is further configured to receive a pre-detection result of the first device;

Referring to FIG. 8, the server further includes:

The confirmation module 505 is configured to confirm, according to the pre-detection result of the first device received by the transmission module 504, whether the second device can communicate with the first device.

Optionally, the transmitting module 504 is further configured to send the registration information of the first device to the second device, and enable the second device to use the first device according to the registration information of the first device. Perform pre-testing;

The transmission module 504 is further configured to receive a pre-detection result of the second device;

The confirmation module 505 further determines whether the first device can communicate with the second device according to the pre-detection result received by the transmission module.

The triggering module 503 is configured to initiate a D2D bearer setup or modify request message to the first device and the second device, where the bearer setup or modify request message includes an identifier of the first device and the second device, and a D2D bearer. Quality of service Qos parameters.

In this embodiment, the triggering module 503 is specifically configured to initiate a D2D bearer setup request message to the first device and the second device, respectively, to trigger the first device and the second device to pass the MME to which the first device and the second device belong. The serving gateway SGW and the public data network gateway PGW send a bearer resource command message, where the bearer resource command message carries the identifiers of the first device and the second device, and the first device and the second device pass the PGW to which the first device and the second device belong And the SGW and the MME respectively send a bearer setup or modify request message to the evolved base station eNB, where the bearer setup or modify request message carries the identifiers of the first device and the second device, so that the eNB is configured according to the first device and the first device The identifier of the second device binds the first device and the second device to establish a D2D communication link between the first device and the second device. Referring to FIG. 9, this embodiment provides an evolved base station eNB, including: a transmission module 601 and a processing module 602.

The transmission module 601 is configured to receive, by the device, the first device in the device D2D a bearer setup or modify request message sent by the mobility management entity MME, where the bearer setup or modify request message includes an identifier of the first device and the second device, where the bearer setup or bearer modification message indicates the first device and The second device uses the communication link of the D2D to carry a service flow that is communicated by the first device and the second device; the first device and the second device are two devices that communicate by D2D;

The processing module 602 is configured to bind the first device and the second device according to the identifiers of the first device and the second device, and establish a D2D between the first device and the second device. Communication link.

In this embodiment, the processing module 602 is specifically configured to:

Receiving a bearer setup or modify request message sent by the first device in the D2D by the MME to which the MME is located, where the bearer setup or modify request message carries the identifiers of the first device and the second device, so as to be public data that belongs to the first device. The network gateway PGW, the serving gateway SGW, and the mobility management entity MME and the PGW, the SGW, and the MME to which the second device belongs, according to the identifiers of the first device and the second device, the first device and the The second device performs binding, and establishes a D2D communication link between the first device and the second device. Referring to FIG. 10, the embodiment provides a first device in the D2D, including: a transmission module 701 and a learning module 702.

a transmission module 701, configured to send registration information to the D2D server, to enable the D2D server to perform pre-matching on the first device according to the registration information, to find a second device in the D2D communication, to the first device The second device sends a communication start request;

The learning module 702 is configured to receive a communication start request sent by the D2D server, and establish a D2D communication link between the first device and the second device by the mobility management entity MME and the evolved base station eNB.

In this embodiment, the registration information sent by the transmission module 701 includes: a D2D identifier of the device, an application identifier, and location information of the device. In this embodiment, the transmission module 701 is further configured to receive registration information of the second device that is sent by the D2D server.

Referring to FIG. 11, the confirmation module 703 is configured to perform, by the first device, pre-detecting the second device according to the registration information of the second device received by the transmission module, to confirm whether the second device is capable of The first device communicates.

In this embodiment, the learning module 702 is configured to receive a D2D bearer setup or modify request message initiated by the D2D server, where the bearer setup or modify request message includes an identifier of the first device and the second device, and a D2D bearer service. Quality Qos parameters.

In this embodiment, the learning module 702 is specifically configured to receive a communication start request sent by the D2D server, and send a bearer resource command message by using the MME, the serving gateway SGW, and the public data network gateway PGW, where the bearer resource command message is carried. And the identifiers of the first device and the second device, and the first device and the second device respectively send, by using the PGW, the SGW, and the MME to which the eNB belongs, a seven-layer establishment or tampering request message, where the The establishing or tampering request message carries the identifiers of the first device and the second device, so that the eNB binds the first device and the second device according to the identifiers of the first device and the second device, Establishing a D2D communication link between the first device and the second device. Referring to FIG. 12, this embodiment provides a system for establishing a device-to-device D2D connection, comprising: the D2D server 500 as described above, the evolved base station eNB600 as described above, and the first device 700 in the D2D as described above. And a second device 800.

In this embodiment, the system further includes: a public data network gateway PGW, a serving gateway SGW, and a mobility management entity MME to which the first device 700 belongs, and a PCRF, a PGW, an SGW, and an MME to which the second device 800 belongs;

The first device and the second device send a bearer resource command message by using the MME, the serving gateway SGW, and the public data network gateway PGW, where the bearer resource command message carries the identifiers of the first device and the second device, and The first device and the second device pass through The PGW, the SGW, and the MME of the eNB respectively send a bearer setup or modify request message to the eNB, where the bearer setup or modify request message carries the identifiers of the first device and the second device, so that the eNB is configured according to the first device and the first device. The identifier of the second device is bound to the first device and the second device, and a D2D communication link between the first device and the second device is established, where the bearer setup or bearer modification message indication is The first device and the second device use the D2D communication link to carry a service flow communicated by the first device and the second device.

The device provided by the present invention has the following advantages: the D2D server acquires registration information of the first device that needs to perform D2D communication, and the D2D server performs pre-processing on the first device according to the registration information of the first device. Matching to find the second device, the first device and the second device are two devices in the D2D, and the D2D server respectively initiates a D2D communication start request to the first device and the second device, triggering the first A device and the second device respectively establish a D2D communication link between the first device and the second device by the mobility management entity MME and the evolved base station eNB. The D2D connection can be established between the two devices, so that the network can be controlled, and the operator can effectively control, manage, or charge the D2D communication, and at the same time, after establishing the D2D connection, compared with the prior art, Since the network can be effectively controlled, the interference caused by the D2D communication to the UE can be further eliminated. The D2D server, the evolved base station, and the first device and the system in the D2D are provided in the same manner as the method embodiment. For details, refer to the method embodiment, and details are not described herein. It should be noted that, in the foregoing D2D server embodiment, each unit included is only divided according to functional logic, but is not limited to the above division, as long as the corresponding function can be implemented; The names are also for convenience of distinction from each other and are not intended to limit the scope of protection of the present invention. In addition, those skilled in the art may understand that all or part of the steps in implementing the above method embodiments may be performed by a program to instruct related hardware, and the corresponding program may be stored in a computer readable storage medium. The storage medium may be a read only memory, a magnetic disk or an optical disk or the like. The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of it within the technical scope disclosed by the embodiments of the present invention. Variations or substitutions are intended to be covered by the scope of the invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

Rights request

A method for establishing a device-to-device D2D connection, the method comprising:

Device to device D2D server obtains registration information of the first device that needs to perform D2D communication;

The D2D server performs pre-matching on the first device to find a second device according to the registration information of the first device, where the first device and the second device are two devices for D2D communication;

The D2D server initiates a D2D communication start request to the first device and the second device, respectively, and triggers the first device and the second device to respectively pass the mobility management entity MME and the evolved base station eNB to which they belong. A D2D communication link is established between the first device and the second device.

The method according to claim 1, wherein the method further comprises: the D2D server receiving device registration information that needs to perform D2D communication, where the device registration information comprises: a D2D identifier of the device, an application identifier, and Location information of the device.

The method according to claim 1 or 2, wherein, if the registration information of the first device further includes application-related information of the first device, the registration according to the first device Information, performing pre-matching on the first device to find the second device, including:

The method according to claim 1 or 2, wherein the registration information of the first device acquired by the device to the device D2D server further includes the label of the second device And determining, according to the registration information of the first device, performing pre-matching on the first device to find the second device includes:

The method according to any one of claims 1-4, wherein, after performing the pre-matching on the first device to find the second device according to the registration information of the first device, the method further includes:

The D2D server sends the registration information of the second device to the first device, so that the first device performs pre-detection on the second device according to the registration information of the second device; the D2D server Receiving a result of successful pre-detection of the first device, and confirming, according to the pre-detection result, whether the second device is capable of communicating with the first device.

The method according to claim 5, wherein, if the D2D server receives a result of successful pre-detection of the first device, and confirms that the second device is capable of communicating with the first device, Also includes:

The method according to claim 1, wherein the D2D server respectively initiates a D2D communication start request to the first device and the second device, including:

The method according to any one of claims 1 to 7, wherein the D2D server initiates a D2D communication start request to the first device and the second device, respectively, to trigger the The first device and the second device establish a D2D communication link between the first device and the second device by using the mobility management entity MME and the evolved base station eNB, respectively, including: the D2D server respectively Initiating a D2D bearer setup or modify request message to the first device and the second device, triggering the first device and the second device to send a bearer by using the MME, the serving gateway SGW, and the public data network gateway PGW to which the first device and the second device belong. a resource command message, where the bearer resource command message carries the identifiers of the first device and the second device, and the first device and the second device respectively send the bearer to the evolved base station eNB by the PGW, the SGW, and the MME to which the first device and the second device belong. Establishing or modifying a request message, where the bearer setup or modify request message carries an identifier of the first device and the second device, so that the eNB, according to the identifiers of the first device and the second device, the first device and the The second device performs binding, and establishes a D2D communication link between the first device and the second device.

9. A method of establishing a device-to-device D2D connection, the method comprising:

The evolved base station eNB receives a bearer setup or modify request message sent by the first device in the device to the device D2D through the mobility management entity MME to which the device belongs, and the bearer setup or modify request message includes the first device and the second device. And the bearer setup or bearer modification message instructing the first device and the second device to use the D2D communication link to carry a service flow that is communicated by the first device and the second device; A device and the second device are two devices for D2D communication;

The method according to claim 9, wherein the receiving, by the eNB, the bearer setup or modify request message sent by the first device in the D2D through the MME to which the eNB belongs includes: receiving, by the first device in the D2D a bearer setup or modify request message sent by the MME, where the bearer setup or modify request message carries the label of the first device and the second device And the MME, the SGW and the MME, and the MME, and Binding the first device and the second device to establish a D2D communication link between the first device and the second device.

11. A method of establishing a device-to-device D2D connection, the method comprising:

The first device in the D2D communication sends the registration information to the D2D server, so that the D2D server performs pre-matching on the first device according to the registration information to find the second device in the D2D communication, to the first device. Said second device sends a communication start request;

The method according to claim 11, wherein the registration information comprises: a D2D identifier of the device, an application identifier, and location information of the device.

The method according to claim 11 or 12, wherein, after the first device sends the registration information to the D2D server, the method further includes:

The method according to any one of claims 11 to 13, wherein the receiving a communication start request sent by the D2D server comprises:

And receiving, by the D2D server, a D2D bearer setup or modify request message, where the bearer setup or modify request message includes an identifier of the first device and the second device, and a service quality Qos parameter of the D2D bearer.

The method according to any one of claims 11 to 14, the receiving a communication start request sent by the D2D server, by the MME and the eNB to which the MME and the eNB belong, in the first device and the The communication link for establishing D2D between the second devices includes:

A device-to-device D2D server, the server includes: an obtaining module, configured to acquire registration information of a first device that needs to perform D2D communication; and a pre-matching module, configured to acquire according to the acquiring module The registration information of the first device, performing pre-matching on the first device to find a second device; the first device and the second device are two devices in D2D communication;

The server according to claim 16, wherein the server further comprises: a transmission module, configured to receive device registration information that needs to perform D2D communication, where the device registration information includes: a D2D identifier of the device, an application identifier And location information of the device.

The server according to claim 16 or 17, wherein the registration information of the first device acquired by the acquiring module further includes application-related information of the first device; Acquiring the registration information of the pre-storage device according to the location information of the first device, where the distance between the pre-storage device and the first device is within a preset range, if an application of one device in the pre-storage device Relevant information and the first device If the related information is consistent, it is confirmed that one of the pre-storage devices is a pre-matched second device.

The server according to claim 16 or 17, wherein

The registration information of the first device acquired by the acquiring module further includes an identifier of the second device;

The pre-matching module is specifically configured to perform pre-matching on the first device to find the second device according to the identifier of the second device acquired by the acquiring module.

The server according to any one of claims 16 to 19, wherein the transmission module is further configured to send registration information of the second device to the first device, so that the first The device performs pre-detection on the second device according to the registration information sent by the transmission module;

The transmission module is further configured to receive a pre-detection result of the first device;

The server further includes:

And a confirmation module, configured to confirm, according to the pre-detection result of the first device received by the transmission module, whether the second device is capable of communicating with the first device.

21. The server of claim 20, wherein:

The transmitting module is further configured to send the registration information of the first device to the second device, so that the second device performs pre-detection on the first device according to the registration information of the first device;

The transmission module is further configured to receive a pre-detection result of the second device;

The confirmation module further determines whether the first device can communicate with the second device according to a pre-detection result received by the transmission module.

The server according to any one of claims 16 to 21, wherein the triggering module is configured to initiate a D2D bearer setup or modification request message to the first device and the second device, respectively. The bearer setup or modify request message includes an identifier of the first device and the second device and a quality of service Qos parameter of the D2D bearer.

The server according to any one of claims 16 to 22, wherein the triggering module is specifically configured to initiate a D2D bearer setup or modification request message to the first device and the second device, respectively. The first device and the second device are triggered to send a bearer resource command message by using the MME, the serving gateway SGW, and the public data network gateway PGW, where the bearer resource command message carries the identifiers of the first device and the second device, And the first device and the second device respectively send a bearer setup or modify request message to the evolved base station eNB by the PGW, the SGW, and the MME to which the UE and the MME belong, where the bearer setup or modify request message carries the first device and the second device. An identifier of the device, so that the eNB binds the first device and the second device according to the identifiers of the first device and the second device, and establishes between the first device and the second device D2D communication link.

An evolved base station eNB, where the base station includes:

The base station according to claim 24, wherein the processing module is specifically configured to:

Receiving a bearer setup or modify request message sent by the first device in the D2D by the MME to which the MME is located, where the bearer setup or modify request message carries the identifiers of the first device and the second device, so as to be public data that belongs to the first device. a network gateway PGW, a serving gateway SGW, and a mobility management entity MME and a PGW, a SGW, and an MME to which the second device belongs, according to And identifying, by the first device and the second device, the first device and the second device, and establishing a D2D communication link between the first device and the second device.

A first device in the D2D, the device comprising:

a transmission module, configured to send registration information to the D2D server, to enable the D2D server to perform pre-matching on the first device according to the registration information, to find a second device in the D2D communication, to the first device The second device sends a communication start request;

The device according to claim 26, wherein the registration information sent by the transmission module comprises: a D2D identifier of the device, an application identifier, and location information of the device.

28. Apparatus according to claim 26 or 27, wherein

The transmission module is further configured to receive registration information of the second device sent by the D2D server;

a confirmation module, configured to pre-detect the second device according to the registration information of the second device received by the transmission module, to confirm whether the second device can communicate with the first device .

The device according to any one of claims 26 to 28, wherein the learning module is configured to receive a D2D bearer setup or modify request message initiated by the D2D server, where the bearer setup or modify request message includes The identity of the first device and the second device and the quality of service Qos parameter of the D2D bearer.

The device according to any one of claims 26 to 29, wherein the learning module is specifically configured to receive a communication start request sent by the D2D server, by using an MME, a service gateway SGW, and public data to which the D2D server belongs. The network gateway PGW sends a bearer resource command message, where the bearer resource command message carries the identifiers of the first device and the second device, and the first device and the second device respectively pass the PGW, the SGW, and the MME to which they belong. Send to the eNB And carrying the setup or modify request message, where the bearer setup or modify request message carries the identifiers of the first device and the second device, so that the eNB, according to the identifiers of the first device and the second device, the first device and The second device performs binding, and establishes a D2D communication link between the first device and the second device.

31. A system for establishing a device-to-device D2D connection, the system comprising: the D2D server according to any one of claims 15-22, the evolution according to any one of claims 23-24 A base station eNB and a first device and a second device in the D2D according to any one of claims 25-29.

The system according to claim 31, wherein the system further comprises: a public data network gateway PGW, a serving gateway SGW, and a mobility management entity MME to which the first device belongs, where the second device belongs PCRF, PGW, SGW and MME;

The first device and the second device send a bearer resource command message by using the MME, the serving gateway SGW, and the public data network gateway PGW, where the bearer resource command message carries the identifiers of the first device and the second device, and The first device and the second device respectively send a bearer setup or modify request message to the eNB by the PGW, the SGW, and the MME to which the eNB belongs, where the bearer setup or modify request message carries the identifiers of the first device and the second device. So that the eNB binds the first device and the second device according to the identifiers of the first device and the second device, and establishes D2D communication between the first device and the second device. a link, the bearer setup or bearer modification message instructing the first device and the second device to use the D2D communication link to carry a service flow communicated by the first device and the second device.