CN110944406B

CN110944406B - Link establishment method of sidelink and terminal

Info

Publication number: CN110944406B
Application number: CN201811120130.3A
Authority: CN
Inventors: 郑倩; 纪子超
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2018-09-25
Filing date: 2018-09-25
Publication date: 2022-02-15
Anticipated expiration: 2038-09-25
Also published as: CN110944406A

Abstract

The invention discloses a link establishing method and a terminal of a side link, wherein the method comprises the following steps: sending a connection establishment request message of a side link unicast link to a second terminal; receiving a connection establishment response message corresponding to the connection establishment request message; and the connection establishment response message is sent by the second terminal when a first preset condition is met. The invention can support the side link to establish point-to-point connection on the physical layer, thereby ensuring the data receiving and transmitting performance of the terminal on the side link by a unicast mechanism.

Description

Link establishment method of sidelink and terminal

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a link establishment method for a sidelink and a terminal.

Background

In order to meet different application scenarios, the mobile communication system may support not only Uplink (Uplink) transmission and Downlink (Downlink) transmission, but also Sidelink (Sidelink), or called Sidelink, or Sidelink-based transmission, for performing direct transmission between terminals without passing through a network device.

The sidelink transmission may be used to support public safety services, such as emergency communication in fire or earthquake disaster, or basic safety communication in the internet of vehicles (V2X). However, in the prior art, data transmitted by the sidelink is communicated based on a broadcast mechanism, the sending end terminal cannot determine the receiving result of the receiving end terminal, and in order to improve the transmission reliability, the sending end terminal always sends data to the receiving end terminal according to the maximum retransmission times, which may result in a low utilization rate of wireless resources of the system. The quality requirements of the advanced V2X service, such as the advanced V2X service requiring low time delay, high reliability and large data volume, such as automatic driving and sensor extension, cannot be met.

Disclosure of Invention

The embodiment of the invention provides a link establishment method of a side link and a terminal, which establish point-to-point connection on a physical layer through the side link, thereby ensuring the data transceiving performance of a unicast mechanism on the side link by the terminal.

In a first aspect, an embodiment of the present invention provides a link establishment method for a sidelink, which is applied to a first terminal, and includes:

sending a connection establishment request message of a side link unicast link to a second terminal;

receiving a connection establishment response message corresponding to the connection establishment request message; and the connection establishment response message is sent by the second terminal when a first preset condition is met.

In a second aspect, an embodiment of the present invention further provides a link establishment method for a sidelink, which is applied to a second terminal, and includes:

receiving a connection establishment request message of a side link unicast link sent by a first terminal;

and sending a connection establishment response message corresponding to the connection establishment request message to the first terminal when a first preset condition is met.

In a third aspect, an embodiment of the present invention provides a terminal, including:

a first sending module, configured to send a connection establishment request message of a sidelink unicast link to a second terminal;

a first receiving module, configured to receive a connection establishment response message corresponding to the connection establishment request message; and the connection establishment response message is sent by the second terminal when a first preset condition is met.

In a fourth aspect, an embodiment of the present invention provides a terminal, including:

the second receiving module is used for receiving a connection establishment request message of the side link unicast link sent by the first terminal;

and the second sending module is used for sending a connection establishment response message corresponding to the connection establishment request message to the first terminal when a first preset condition is met.

In a fifth aspect, an embodiment of the present invention further provides a terminal, including a processor, a memory, and a computer program stored on the memory and executable on the processor, where the computer program, when executed by the processor, implements the steps of the link establishment method for a sidelink as described above.

In a sixth aspect, the embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when being executed by a processor, the computer program implements the steps of the link establishment method for a sidelink as described above.

In this way, in the embodiment of the present invention, a connection establishment request message of the sidelink unicast link is sent to the second terminal; receiving a connection establishment response message corresponding to the connection establishment request message; the connection establishment response message is sent by the second terminal when the second terminal meets a first preset condition, and therefore, the data receiving and sending performance of a unicast mechanism on a side link of the terminal is guaranteed by establishing point-to-point connection of a physical layer between the terminals.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 is a flowchart illustrating a link establishment method for a sidelink according to an embodiment of the present invention;

fig. 2 is a second flowchart of a link establishment method of a sidelink according to an embodiment of the present invention;

fig. 3 is a third schematic flow chart of a link establishment method of a sidelink according to an embodiment of the present invention;

fig. 4 is a fourth flowchart illustrating a link establishment method of a sidelink according to an embodiment of the present invention;

fig. 5 is a fifth flowchart illustrating a link establishment method for a sidelink according to an embodiment of the present invention;

fig. 6 is a sixth flowchart of a link establishment method of a sidelink according to an embodiment of the present invention;

fig. 7 is a seventh flowchart illustrating a link establishment method of a sidelink according to an embodiment of the present invention;

fig. 8 is an eighth flowchart illustrating a link establishment method for a sidelink according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of a terminal according to an embodiment of the present invention;

fig. 10 is a second schematic structural diagram of a terminal according to an embodiment of the present invention;

fig. 11 is a schematic diagram of a hardware structure of a terminal according to an embodiment of the present invention.

Detailed Description

Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. In the description and in the claims "and/or" means at least one of the connected objects.

As shown in fig. 1, a flowchart of a link establishment method for a sidelink according to an embodiment of the present invention is applied to a first terminal.

Step 101, sending a connection establishment request message of a side link unicast link to a second terminal;

in this step, the sidelink may include: new Radio Sidelink (NR Sidelink).

Step 102, receiving a connection establishment response message corresponding to the connection establishment request message; and the connection establishment response message is sent by the second terminal when a first preset condition is met.

In this step, the first preset condition includes at least one of the following:

the authentication is successful and the authentication is successful,

the second terminal supports at least part of the list of algorithm identifications of the first terminal,

the second terminal supports layer one capability information of at least part of the first terminal,

the second terminal supports at least part of the layer two capability information of the first terminal.

Here, the successful authentication specifically means that the second terminal successfully authenticates the first terminal.

The layer one capability information of the first terminal includes: a supported carrier frequency (carrier frequency), a Bandwidth Part (BWP), a resource pool (resource pool) list, a subcarrier spacing SCS list, and a modulation coding format list.

The second layer capability information of the first terminal includes at least one of a supported MAC (Medium Access Control) layer parameter list, a Radio Link Control (RLC) layer parameter list, a Packet Data Convergence Protocol (PDCP) layer parameter list, and a Service Data Adaptation Protocol (SDAP) layer parameter list.

The link establishment method of the side link in the embodiment of the invention sends a connection establishment request message of a side link unicast link to a second terminal; receiving a connection establishment response message corresponding to the connection establishment request message; the connection establishment response message is sent by the second terminal when the second terminal meets a first preset condition, and therefore, the data receiving and sending performance of a unicast mechanism on a side link of the terminal is guaranteed by establishing point-to-point connection of a physical layer between the terminals.

Preferably, the connection establishment request message includes at least one of the following information:

the identity of the source is identified,

the identification of the purpose is carried out,

the characteristic information to be used for the authentication,

a cause value indicating the cause of the connection establishment request,

security capability information of the first terminal,

layer one capability information of the first terminal,

layer two capability information of the first terminal.

Specifically, the source identifier is a source identifier (source ID) of the first terminal, and the destination identifier is a destination identifier (destination ID) of the second terminal.

The feature information used for authentication specifically refers to a security token (security token) or a security signature (security signature), and is used by the second terminal to authenticate feature information of a valid identity of the first terminal.

The security capability information of the first terminal comprises a list of supported Algorithm identifications (algorithmid).

The layer one capability information of the first terminal includes: at least one of a supported Carrier frequency (Carrier frequency), a Bandwidth Part (BWP), a resource pool (resource pool) list, a Sub-Carrier Spacing (SCS) list, and a modulation coding format list.

Here, layer one may be the physical layer.

The layer two capability information of the first terminal includes: at least one of a supported MAC layer parameter list, a RLC layer parameter list, a PDCP layer parameter list, and a SDAP layer parameter list.

Preferably, the connection establishment response message includes at least one of the following information:

the identity of the source is identified,

the identification of the purpose is carried out,

the characteristic information to be used for the authentication,

security capability information of at least part of the first terminal supported by the second terminal,

security capability information of the second terminal,

layer one capability information of at least part of the first terminal supported by the second terminal,

layer one capability information of the second terminal,

layer two capability information of at least part of the first terminal supported by the second terminal,

layer two capability information of the second terminal.

It should be noted that the connection establishment response message corresponds to the connection establishment request message.

In case the connection setup request message includes any combination between other information than the security capability information of the first terminal, then the connection setup response message includes at least one of information in the corresponding any combination and the security capability information of the second terminal.

For example, if the connection establishment request message includes the source identifier, the destination identifier and the feature information for authentication, the connection establishment response message includes: at least one of a source identifier, a destination identifier, feature information for authentication, and security capability information of the second terminal.

In case the connection setup request message comprises any combination between the security capability information of the first terminal and other information, then the connection setup response message comprises at least one of information in the corresponding any combination and at least part of the security capability information of the first terminal supported by the second terminal.

In case the connection setup request message only includes the security capability information of the first terminal, then the connection setup response message only includes the security capability information of at least part of the first terminal supported by the second terminal.

In a preferred embodiment of the present invention, as shown in fig. 2, after sending a connection establishment request message of the sidelink unicast link to the second terminal in step 201, the method may further include:

step 202, receiving a connection establishment rejection message corresponding to the connection establishment request message; wherein the connection establishment rejection message is sent by the second terminal when at least one of the first preset conditions is not met.

the authentication is successful and the authentication is successful,

The layer one capability information of the first terminal includes: at least one of a supported carrier frequency, a bandwidth part BWP, a resource pool list, a subcarrier spacing SCS list, and a modulation coding format list.

The layer two capability information of the first terminal includes at least one of a supported MAC layer parameter list, an RLC layer parameter list, a PDCP layer parameter list, and an SDAP layer parameter list.

Preferably, the connection establishment rejection message includes at least one of the following information:

the identity of the source is identified,

the identification of the purpose is carried out,

a cause value for indicating a reason for connection establishment rejection, an

The waiting time of the next connection establishment request message.

It should be noted that the waiting time of the next connection establishment request message is used to indicate that the first terminal starts a waiting timer and waits for a given time before initiating the connection establishment request of the unicast link again when receiving the connection establishment reject message.

Preferably, the connection establishment rejection reason includes at least one of:

the authentication is failed and the authentication is not successful,

the capabilities of the second terminal are not supported,

said source identification and/or said destination identification conflicting, an

The traffic associated with the source identity and/or the destination identity is not authorized.

Here, the connection setup request message and the connection setup rejection message are transmitted through a common control channel of the sidelink.

Based on the embodiment shown in fig. 1, as a preferred implementation manner, step 101 may specifically include the following steps:

and sending the connection establishment request message of the side link unicast link to the second terminal when a second preset condition is met.

In this step, preferably, the second preset condition includes at least one of the following:

determining a connection establishment request process for triggering a unicast link, wherein the connection establishment request process is determined by an upper layer of the first terminal and is notified to an access AS layer of the terminal for triggering, or the connection establishment request process is triggered by the AS layer of the first terminal;

the existence of available source identifiers indicates the first terminal; and

the presence of an available destination identity indicates the second terminal.

Here, the upper layer includes an Access Stratum (AS) or more. Namely the NAS layer and/or the application layer.

Based on the embodiment shown in fig. 1 and the preferred implementation manner corresponding to step 101, preferably, the connection establishment request message further carries connection establishment configuration information of a unicast link.

In a preferred embodiment, when the connection establishment request message further carries connection establishment configuration information of a unicast link, the connection establishment response message further carries connection establishment configuration completion information; and the connection establishment configuration completion information is fed back when the second terminal meets a third preset condition.

In another preferred embodiment, when the connection establishment request message further carries connection establishment configuration information of a unicast link, after step 101, the method further includes:

receiving a connection establishment rejection message corresponding to the connection establishment request message; wherein the connection establishment rejection message is sent when the second terminal does not satisfy at least one of third preset conditions.

Here, the connection setup rejection message includes: a cause value indicating a connection establishment rejection cause, the connection establishment rejection cause comprising: the second terminal does not support the connection setup configuration information of the first terminal.

Based on the embodiment shown in fig. 1, as another preferred implementation manner, as shown in fig. 3, after step 102, the method further includes:

step 103, sending a connection establishment configuration message to the second terminal, where the connection establishment configuration message carries the connection establishment configuration information of the unicast link.

Further, after step 103, the method further comprises:

step 104, receiving a connection establishment configuration completion message fed back by the second terminal, wherein the connection establishment configuration completion message carries connection establishment configuration completion information of the unicast link; and the connection establishment configuration completion information is fed back when the second terminal meets a third preset condition.

It should be noted that, in the two preferred implementation manners, preferably, the connection establishment configuration information includes information indicating at least one of the following:

configuration information of a signaling radio bearer of the sidelink by the first terminal,

configuration information of at least one of an associated service data adaptation protocol, SDAP, packet data convergence protocol, PDCP, radio link control, RLC, media access control, MAC, and physical layer of a signaling radio bearer of the sidelink by the first terminal,

configuration information of the first terminal to a data radio bearer of the sidelink, and

the first terminal configures configuration information of at least one of an associated SDAP layer, a PDCP layer, an RLC layer, an MAC layer and a physical layer of a data radio bearer of the sidelink.

In the two preferred implementation manners, preferably, the third preset condition includes at least one of the following:

the second terminal supports configuration information of at least part of signaling radio bearers of the first terminal to the sidelink,

the second terminal supporting configuration information for at least one of an SDAP layer, a PDCP layer, an RLC layer, a MAC layer, and a physical layer associated at least in part with a signaling radio bearer of the sidelink,

the second terminal supports configuration information of at least part of the data radio bearer of the first terminal to the sidelink, an

The second terminal supports configuration information for at least one of an SDAP layer, a PDCP layer, an RLC layer, a MAC layer, and a physical layer associated at least in part with a data radio bearer of the sidelink.

Preferably, at least one of the connection setup response message, the connection setup configuration message and the connection setup configuration complete message is transmitted through a dedicated control channel of the sidelink.

Preferably, the connection setup request message and the connection setup rejection message are transmitted through a common control channel of the sidelink.

As shown in fig. 4, a flowchart of a link establishment method for a sidelink according to an embodiment of the present invention is applied to a second terminal.

Step 401, receiving a connection establishment request message of a side link unicast link sent by a first terminal;

in this step, the sidelink may include: NR Sidelink.

Step 402, when a first preset condition is met, sending a connection establishment response message corresponding to the connection establishment request message to the first terminal.

the authentication is successful and the authentication is successful,

The layer two capability information of the first terminal comprises at least one of a supported Media Access Control (MAC) layer parameter list, a Radio Link Control (RLC) layer parameter list, a Packet Data Convergence Protocol (PDCP) layer parameter list and a Service Data Adaptation Protocol (SDAP) layer parameter list.

The link establishment method of the side link in the embodiment of the invention comprises the steps of receiving a connection establishment request message of a side link unicast link sent by a first terminal; and when a first preset condition is met, sending a connection establishment response message corresponding to the connection establishment request message to the first terminal, so that the data transceiving performance of a unicast mechanism on a side link of the terminal is ensured by establishing point-to-point connection of a physical layer between the terminals.

the identity of the source is identified,

the identification of the purpose is carried out,

the characteristic information to be used for the authentication,

a cause value indicating the cause of the connection establishment request,

security capability information of the first terminal,

layer one capability information of the first terminal,

layer two capability information of the first terminal.

Here, specifically, the source identifier is a source identifier source ID of the first terminal, and the destination identifier is a destination identifier destination ID of the second terminal.

The characteristic information used for authentication specifically refers to a security token or a security signature, and is characteristic information used by the second terminal to authenticate the valid identity of the first terminal.

The security capability information of the first terminal comprises a list of supported Algorithm identifications algorithmid.

The layer one capability information of the first terminal includes: carrier frequency, bandwidth part BWP, resource pool list, list of supported subcarrier spacings, SCS, and list of supported modulation and coding formats.

Here, layer one is the physical layer.

the identity of the source is identified,

the identification of the purpose is carried out,

the characteristic information to be used for the authentication,

security capability information of the second terminal,

layer one capability information of the second terminal,

layer two capability information of the second terminal.

In a preferred embodiment of the present invention, as shown in fig. 5, after receiving a connection establishment request message of a sidelink unicast link sent by a first terminal in step 501, the method may further include:

step 502, when at least one of the first preset conditions is not satisfied, sending a connection setup rejection message corresponding to the connection setup request message to the first terminal.

the authentication is successful and the authentication is successful,

the identity of the source is identified,

the identification of the purpose is carried out,

The waiting time of the next connection establishment request message.

the authentication is failed and the authentication is not successful,

the capabilities of the second terminal are not supported,

Based on the embodiment shown in fig. 4, as a preferred implementation manner, the connection establishment request message further carries connection establishment configuration information of a unicast link.

In a preferred embodiment, when the connection establishment request message further carries connection establishment configuration information of a unicast link, the connection establishment response message further carries connection establishment configuration completion information.

In another preferred embodiment, when the connection establishment request message further carries connection establishment configuration information of a unicast link, after step 401, the method further includes:

and when the second terminal does not meet at least one of third preset conditions, sending a connection establishment rejection message corresponding to the connection establishment request message to the first terminal.

The connection setup rejection message includes: a cause value indicating a connection establishment rejection cause, the connection establishment rejection cause comprising: the second terminal does not support the connection setup configuration information of the first terminal.

Here, preferably, the connection setup request message and the connection setup rejection message are transmitted through a common control channel of the sidelink.

Based on the embodiment shown in fig. 1, as another preferred implementation manner, as shown in fig. 6, after step 402, the method further includes:

step 403, receiving a connection establishment configuration message sent by the first terminal, where the connection establishment configuration message carries connection establishment configuration information of the unicast link.

Further, after step 103, the method further comprises:

step 404, feeding back a connection establishment configuration completion message to the first terminal, where the connection establishment configuration completion message carries connection establishment configuration completion information of the unicast link.

The step may specifically comprise the steps of:

and when a third preset condition is met, sending a connection establishment configuration completion message corresponding to the connection establishment request message to the first terminal.

Here, preferably, at least one of the connection setup response message, the connection setup configuration message, and the connection setup configuration complete message is transmitted through a dedicated control channel of the sidelink.

The following takes fig. 7 as an example to specifically describe a specific implementation process of the link establishment method for the sidelink.

It should be noted that, in fig. 7, UE _1 represents a first terminal, and UE _2 represents a second terminal.

S1: when UE _1 satisfies the second preset condition, UE _1 triggers a connection Setup Request (Unicast link Setup Request) message that initiates a Unicast link to UE _2, that is, shown in fig. 7.

Wherein the second preset condition comprises at least one of the following:

a. determining a connection establishment request process for triggering a unicast link, wherein the connection establishment request process is determined by an upper layer of the UE _1 and is notified to an access AS layer of the UE _1 for triggering, or the connection establishment request process is triggered by the AS layer of the UE _ 1;

here, the upper layer includes AS layer or more. Namely the NAS layer and/or the application layer.

b. The existence of an available source identity source ID indicates UE _ 1; and

c. the presence of an available destination identification ID indicates UE _ 2.

Wherein the connection establishment request message includes at least one of the following information:

the source identifies the source ID and the source ID,

the destination identification ID of the destination address,

the feature information for authentication, i.e., Token _1 information, is used for UE _2 to authenticate UE _ 1.

A Cause value indicating the Cause of the connection establishment request,

the security capability information of UE _1, including the list of supported Algorithm identities algorithmid.

Layer one capability information of UE _1, comprising: at least one of a supported carrier frequency, a bandwidth part BWP, a resource pool list, a subcarrier spacing SCS list, and a modulation coding format list.

Layer two capability information of UE _1, including at least one of a supported MAC layer parameter list, an RLC layer parameter list, a PDCP layer parameter list, and an SDAP layer parameter list.

The method comprises the steps that configuration information of a radio bearer of the Sidelink signaling also comprises configuration information of a first layer and a second layer which are associated with the radio bearer of the Sidelink signaling;

the configuration information of the Sidelink data radio bearer further comprises layer one and layer two configuration information associated with the Sidelink data radio bearer.

Here, the connection establishment request for the unicast link is sent on the Sidelink common control channel.

The Radio Resource of the Sidelink common Control channel is configured by at least one of pre-configuration, broadcast message and Radio Resource Control (RRC) dedicated signaling.

Here, UE _2 listens on the Sidelink common control channel and receives a unicast connection establishment request message from UE _ 1.

S2: when UE _2 satisfies the first preset condition, UE _2 replies a Unicast link setup Response (Unicast link setup Response) message to UE _1, that is, as shown in fig. 7.

Wherein the first preset condition comprises at least one of the following:

a. the authentication is successful, and the specific value indicates that the UE _2 successfully authenticates the UE _ 1;

UE 2 supports at least part of the algorithm identification list of UE1,

UE 2 supports layer one capability information of at least part of UE1,

UE 2 supports layer two capability information of at least part of UE1,

the Sidelink signaling radio bearer configuration information of part or all of UE _1 supported by UE _2 or the Sidelink signaling radio bearer configuration information supported by UE _2,

and f, Sidelink data radio bearer configuration information supported by UE _2 or Sidelink data radio bearer configuration information supported by UE _2 of part or all of UE _ 1.

Wherein the connection establishment response message includes at least one of the following information:

the source identifies the source ID and the source ID,

the destination identification ID of the destination address,

characteristic information for authentication, i.e., Token _2 information, for UE _2 to authenticate UE _1,

security capability information of at least a part of UE _1 supported by UE _2,

the security capability information of the UE _2,

layer one capability information of at least part of UE _1 supported by UE _2,

layer one capability information of the UE _2,

layer two capability information of at least part of UE _1 supported by UE _2,

layer two capability information of the UE _2,

at least part of the Sidelink signaling radio bearer configuration information of UE _1 supported by UE _2 or the Sidelink signaling radio bearer configuration information supported by UE _2,

configuration information of the Sidelink data radio bearer supported by UE _2 and at least partial UE _1 or UE _2

Here, the connection response request for the unicast link is sent on the Sidelink dedicated control channel. The radio resource of the Sidelink dedicated control channel is configured by a unicast connection establishment request message.

When UE _2 does not satisfy at least one of the first preset conditions, UE _2 replies a Unicast connection setup Reject (Unicast link setup Reject) message to UE _ 1. I.e. the Unicast link setup Reject message shown in FIG. 7

Wherein the connection establishment rejection message comprises at least one of the following information:

a source identification (source ID),

a destination identification (destination ID),

a Cause value (Cause value) for indicating a reason for connection establishment rejection, an

Wait time of next connection establishment request message (Wait time).

Here, the connection establishment rejection reason for the unicast link includes at least one of:

the authentication is failed and the authentication is not successful,

the capability of UE 2 is not supported,

detecting a source identification and/or destination identification conflict, an

The traffic associated with the source identification and/or the destination identification is not authorized.

Of course, in addition to the above-mentioned reasons, connection establishment rejection reasons for other unicast links may also be included.

It should be noted that, when UE _2 replies a Unicast link setup Reject (Unicast link setup Reject) message to UE _1, the connection setup procedure of the Unicast link is ended.

S3: UE _1 determines a connection setup Configuration (Unicast link setup Configuration) message for establishing a Unicast link with UE _2 according to the received Unicast connection setup response message, which is shown in ((c) of fig. 7).

Here, the connection setup configuration message carries connection setup configuration information of the unicast link.

Wherein the connection establishment configuration information comprises information indicating at least one of:

UE _1 signaling radio bearer configuration for sidelink,

UE _1 configures the data radio bearer of the sidelink,

UE _1 configures configuration of at least one of physical layer, MAC layer, RLC layer, PDCP layer, and DAP layer configurations associated with signaling radio bearer configuration of the sidelink,

UE _1 configures configuration of at least one of associated physical layer, MAC layer, RLC layer, PDCP layer, and DAP layer configurations for the data radio bearer of the sidelink.

Here, UE _1 transmits Configuration information for establishing a Unicast connection with UE _2 to UE _2 through a Unicast connection setup Configuration (Unicast link setup Configuration) message.

S4: UE _2 receives the Unicast link setup Configuration (Unicast link setup Configuration) message, applies the Configuration information for setting up the Unicast link to establish the Unicast link with UE1, and then sends a Unicast link setup Configuration Complete (Unicast link setup Configuration Complete) message to UE _1, which is shown in fig. 7 (a).

In addition, in the above link establishment method of the sidelink, the contents shown in (i) and (iii) in fig. 7 may be merged, that is, the connection establishment request message carries the connection establishment configuration information, as shown in (i) in fig. 8; the contents of the messages of (ii) and (iv) in fig. 7 are merged, that is, the connection establishment response message carries the connection establishment configuration completion information, as shown in (ii) in fig. 8. It should be noted that, when UE _2 does not satisfy at least one of the connection establishment request message or the connection establishment configuration information, a Unicast link setup Reject (Unicast link setup Reject) message is replied to UE _1, and the connection setup procedure of the Unicast link is ended.

Here, for the link establishing method of the sidelink shown in fig. 8, the step of information interaction in the link establishing process is omitted, and the implementation principle thereof may refer to the embodiment part shown in fig. 7, which is not described herein again.

The above embodiments respectively describe in detail the link establishment methods of the sidelink in different scenarios, and the following embodiments further describe the corresponding terminals with reference to the accompanying drawings.

As shown in fig. 9, a terminal 900 according to an embodiment of the present invention can implement details of a link establishment method of a sidelink in the foregoing embodiments, and achieve the same effect, where the terminal 900 specifically refers to a first terminal, and specifically includes the following functional modules:

a first sending module 901, configured to send a connection establishment request message of a sidelink unicast link to a second terminal;

a first receiving module 902, configured to receive a connection establishment response message corresponding to the connection establishment request message; and the connection establishment response message is sent by the second terminal when a first preset condition is met.

the identity of the source is identified,

the identification of the purpose is carried out,

the characteristic information to be used for the authentication,

a cause value indicating the cause of the connection establishment request,

security capability information of the first terminal,

layer one capability information of the first terminal,

layer two capability information of the first terminal.

the identity of the source is identified,

the identification of the purpose is carried out,

the characteristic information to be used for the authentication,

security capability information of the second terminal,

layer one capability information of the second terminal,

layer two capability information of the second terminal.

The terminal 900 according to the embodiment of the present invention further includes:

a third receiving module, configured to receive a connection establishment rejection message corresponding to the connection establishment request message; wherein the connection establishment rejection message is sent by the second terminal when at least one of the first preset conditions is not met.

the identity of the source is identified,

the identification of the purpose is carried out,

The waiting time of the next connection establishment request message.

the authentication is failed and the authentication is not successful,

the capabilities of the second terminal are not supported,

Preferably, the first preset condition includes at least one of:

the authentication is successful and the authentication is successful,

Preferably, the first sending module 901 includes:

and the first sending unit is used for sending the connection establishment request message of the side link unicast link to the second terminal when a second preset condition is met.

Preferably, the second preset condition includes at least one of:

the existence of available source identifiers indicates the first terminal; and

Preferably, the connection establishment request message also carries connection establishment configuration information of a unicast link;

alternatively, preferably, the terminal 900 further includes:

a third sending module, configured to send a connection establishment configuration message to the second terminal, where the connection establishment configuration message carries connection establishment configuration information of the unicast link.

Preferably, the connection establishment configuration information includes information indicating at least one of:

Preferably, when the connection establishment request message further carries connection establishment configuration information of a unicast link, the connection establishment response message further carries connection establishment configuration completion information;

alternatively, preferably, the terminal 900 further includes:

a fourth receiving module, configured to receive a connection establishment configuration completion message fed back by the second terminal, where the connection establishment configuration completion message carries connection establishment configuration completion information of the unicast link;

and the connection establishment configuration completion information is fed back when the second terminal meets a third preset condition.

The terminal 900 of the embodiment of the present invention may further include:

a fifth receiving module, configured to receive a connection establishment rejection message corresponding to the connection establishment request message; wherein the connection establishment rejection message is sent when the second terminal does not satisfy at least one of third preset conditions.

Preferably, the connection establishment rejection message includes: a cause value indicating a connection establishment rejection cause, the connection establishment rejection cause comprising: the second terminal does not support the connection setup configuration information of the first terminal.

Preferably, the third preset condition includes at least one of:

The first terminal supports configuration information for at least one of an SDAP layer, a PDCP layer, an RLC layer, a MAC layer, and a physical layer associated at least in part with a data radio bearer of the sidelink.

The terminal of the embodiment of the invention sends a connection establishment request message of a side link unicast link to a second terminal through a first sending module; the first receiving module receives a connection establishment response message corresponding to the connection establishment request message; the connection establishment response message is sent by the second terminal when the second terminal meets a first preset condition, and therefore, the data receiving and sending performance of a unicast mechanism on a side link of the terminal is guaranteed by establishing point-to-point connection of a physical layer between the terminals.

As shown in fig. 10, a terminal 1000 according to an embodiment of the present invention can implement details of a link establishment method of a sidelink in the foregoing embodiments, and achieve the same effect, where the terminal 1000 specifically refers to a second terminal, and specifically includes the following functional modules:

a second receiving module 1001, configured to receive a connection establishment request message of a sidelink unicast link sent by a first terminal;

a second sending module 1002, configured to send a connection establishment response message corresponding to the connection establishment request message to the first terminal when a first preset condition is met.

the identity of the source is identified,

the identification of the purpose is carried out,

the characteristic information to be used for the authentication,

a cause value indicating the cause of the connection establishment request,

security capability information of the first terminal,

layer one capability information of the first terminal,

layer two capability information of the first terminal.

the identity of the source is identified,

the identification of the purpose is carried out,

the characteristic information to be used for the authentication,

security capability information of the second terminal,

layer one capability information of the second terminal,

layer two capability information of the second terminal.

Terminal 1000 in accordance with embodiments of the present invention can further include:

a fourth sending module, configured to send, to the first terminal, a connection establishment rejection message corresponding to the connection establishment request message when at least one of the first preset conditions is not met.

Preferably, the connection setup rejection message includes at least one of the following information:

the identity of the source is identified,

the identification of the purpose is carried out,

The waiting time of the next connection establishment request message.

the authentication is failed and the authentication is not successful,

the capabilities of the second terminal are not supported,

the second terminal does not support the configuration of the first terminal,

Preferably, the first preset condition includes at least one of:

the authentication is successful and the authentication is successful,

alternatively, preferably, the terminal 1000 may further include:

a sixth receiving module, configured to receive a connection establishment configuration message sent by the first terminal, where the connection establishment configuration message carries connection establishment configuration information of the unicast link.

alternatively, preferably, the terminal 1000 may further include:

a feedback module, configured to feed back a connection establishment configuration completion message to the first terminal, where the connection establishment configuration completion message carries connection establishment configuration completion information of the unicast link.

Preferably, the feedback module may include:

and a second sending unit, configured to send a connection establishment configuration completion message corresponding to the connection establishment request message to the first terminal when a third preset condition is met.

a fifth sending module, configured to send a connection setup rejection message corresponding to the connection setup request message to the first terminal when the second terminal does not meet at least one of third preset conditions.

Preferably, the third preset condition includes at least one of:

The terminal of the embodiment of the invention receives a connection establishment request message of a side link unicast link sent by a first terminal through a second receiving module; and the second sending module sends a connection establishment response message corresponding to the connection establishment request message to the first terminal when the first preset condition is met, so that the data transceiving performance of a unicast mechanism on a side link of the terminal is ensured by establishing point-to-point connection of a physical layer between the terminals.

It should be noted that the division of the modules of the network device and the terminal is only a logical division, and the actual implementation may be wholly or partially integrated into one physical entity, or may be physically separated. And these modules can be realized in the form of software called by processing element; or may be implemented entirely in hardware; and part of the modules can be realized in the form of calling software by the processing element, and part of the modules can be realized in the form of hardware. For example, the determining module may be a processing element separately set up, or may be implemented by being integrated in a chip of the apparatus, or may be stored in a memory of the apparatus in the form of program code, and the function of the determining module is called and executed by a processing element of the apparatus. Other modules are implemented similarly. In addition, all or part of the modules can be integrated together or can be independently realized. The processing element described herein may be an integrated circuit having signal processing capabilities. In implementation, each step of the above method or each module above may be implemented by an integrated logic circuit of hardware in a processor element or an instruction in the form of software.

For example, the above modules may be one or more integrated circuits configured to implement the above methods, such as: one or more Application Specific Integrated Circuits (ASICs), or one or more microprocessors (DSPs), or one or more Field Programmable Gate Arrays (FPGAs), etc. For another example, when some of the above modules are implemented in the form of a Processing element scheduler code, the Processing element may be a general-purpose processor, such as a Central Processing Unit (CPU) or other processor that can invoke the program code. As another example, these modules may be integrated together, implemented in the form of a system-on-a-chip (SOC).

To better achieve the above object, further, fig. 11 is a schematic diagram of a hardware structure of a terminal for implementing various embodiments of the present invention, where the terminal 1100 includes, but is not limited to: radio frequency unit 1101, network module 1102, audio output unit 1103, input unit 1104, sensor 1105, display unit 1106, user input unit 1107, interface unit 1108, memory 1109, processor 1110, and power supply 1111. Those skilled in the art will appreciate that the terminal structure shown in fig. 11 does not constitute a limitation of the terminal, and that the terminal may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components. In the embodiment of the present invention, the terminal includes, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a palm computer, a vehicle-mounted terminal, a wearable device, a pedometer, and the like.

The radio frequency unit 1101 is configured to send a connection establishment request message of a sidelink unicast link to the second terminal; receiving a connection establishment response message corresponding to the connection establishment request message; and the connection establishment response message is sent by the second terminal when a first preset condition is met.

Or, the radio frequency unit 1101 is configured to receive a connection establishment request message of a sidelink unicast link sent by the first terminal; and sending a connection establishment response message corresponding to the connection establishment request message to the first terminal when a first preset condition is met.

The terminal of the embodiment of the invention establishes point-to-point connection of a physical layer between the terminals, thereby ensuring the data transceiving performance of a unicast mechanism on a side link of the terminal.

It should be understood that, in the embodiment of the present invention, the radio frequency unit 1101 may be configured to receive and transmit signals during a message transmission or a call, and specifically, receive downlink data from a base station and then process the received downlink data to the processor 1110; in addition, the uplink data is transmitted to the base station. In general, radio frequency unit 1101 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like. In addition, the radio frequency unit 1101 may also communicate with a network and other devices through a wireless communication system.

The terminal provides the user with wireless broadband internet access via the network module 1102, such as helping the user send and receive e-mails, browse web pages, and access streaming media.

The audio output unit 1103 may convert audio data received by the radio frequency unit 1101 or the network module 1102 or stored in the memory 1109 into an audio signal and output as sound. Also, the audio output unit 1103 may also provide audio output related to a specific function performed by the terminal 1100 (e.g., a call signal reception sound, a message reception sound, etc.). The audio output unit 1103 includes a speaker, a buzzer, a receiver, and the like.

The input unit 1104 is used to receive audio or video signals. The input Unit 1104 may include a Graphics Processing Unit (GPU) 11041 and a microphone 11042, and the Graphics processor 11041 processes image data of still pictures or video obtained by an image capturing device, such as a camera, in a video capturing mode or an image capturing mode. The processed image frames may be displayed on the display unit 116. The image frames processed by the graphic processor 11041 may be stored in the memory 1109 (or other storage medium) or transmitted via the radio frequency unit 1101 or the network module 1102. The microphone 11042 may receive sound and can process such sound into audio data. The processed audio data may be converted into a format output transmittable to a mobile communication base station via the radio frequency unit 1101 in case of the phone call mode.

Terminal 1100 can also include at least one sensor 1105, such as a light sensor, motion sensor, and other sensors. Specifically, the light sensor includes an ambient light sensor that adjusts the brightness of the display panel 11061 according to the brightness of ambient light, and a proximity sensor that turns off the display panel 11061 and/or a backlight when the terminal 1100 moves to the ear. As one of the motion sensors, the accelerometer sensor can detect the magnitude of acceleration in each direction (generally three axes), detect the magnitude and direction of gravity when stationary, and can be used to identify the terminal posture (such as horizontal and vertical screen switching, related games, magnetometer posture calibration), vibration identification related functions (such as pedometer, tapping), and the like; the sensors 1105 may also include fingerprint sensors, pressure sensors, iris sensors, molecular sensors, gyroscopes, barometers, hygrometers, thermometers, infrared sensors, etc., and will not be described in detail herein.

The display unit 1106 is used to display information input by a user or information provided to the user. The Display unit 1106 may include a Display panel 11061, and the Display panel 11061 may be configured in the form of a Liquid Crystal Display (LCD), an Organic Light-Emitting Diode (OLED), or the like.

The user input unit 1107 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the terminal. Specifically, the user input unit 1107 includes a touch panel 11071 and other input devices 11072. The touch panel 11071, also referred to as a touch screen, may collect touch operations by a user on or near the touch panel 11071 (e.g., operations by a user on or near the touch panel 11071 using a finger, a stylus, or any other suitable object or attachment). The touch panel 11071 may include two portions of a touch detection device and a touch controller. The touch detection device detects the touch direction of a user, detects a signal brought by touch operation and transmits the signal to the touch controller; the touch controller receives touch information from the touch sensing device, converts the touch information into touch point coordinates, and sends the touch point coordinates to the processor 1110, and receives and executes commands sent from the processor 1110. In addition, the touch panel 11071 may be implemented by various types, such as a resistive type, a capacitive type, an infrared ray, and a surface acoustic wave. The user input unit 1107 may include other input devices 11072 in addition to the touch panel 11071. In particular, the other input devices 11072 may include, but are not limited to, a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, and a joystick, which are not described in detail herein.

Further, the touch panel 11071 can be overlaid on the display panel 11061, and when the touch panel 11071 detects a touch operation thereon or nearby, the touch operation is transmitted to the processor 1110 to determine the type of the touch event, and then the processor 1110 provides a corresponding visual output on the display panel 11061 according to the type of the touch event. Although the touch panel 11071 and the display panel 11061 are shown in fig. 11 as two separate components to implement the input and output functions of the terminal, in some embodiments, the touch panel 11071 and the display panel 11061 may be integrated to implement the input and output functions of the terminal, and the implementation is not limited herein.

The interface unit 1108 is an interface for connecting an external device to the terminal 1100. For example, the external device may include a wired or wireless headset port, an external power supply (or battery charger) port, a wired or wireless data port, a memory card port, a port for connecting a device having an identification module, an audio input/output (I/O) port, a video I/O port, an earphone port, and the like. Interface unit 1108 may be used to receive input (e.g., data information, power, etc.) from external devices and transmit the received input to one or more elements within terminal 1100 or may be used to transmit data between terminal 1100 and external devices.

The memory 1109 may be used to store software programs as well as various data. The memory 1109 may mainly include a storage program area and a storage data area, where the storage program area may store an operating system, an application program (such as a sound playing function, an image playing function, etc.) required by at least one function, and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. In addition, the memory 1109 may include high speed random access memory and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.

The processor 1110 is a control center of the terminal, connects various parts of the entire terminal using various interfaces and lines, and performs various functions of the terminal and processes data by operating or executing software programs and/or modules stored in the memory 1109 and calling data stored in the memory 1109, thereby integrally monitoring the terminal. Processor 1110 may include one or more processing units; preferably, the processor 1110 may integrate an application processor, which mainly handles operating systems, user interfaces, application programs, etc., and a modem processor, which mainly handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into processor 1110.

The terminal 1100 can also include a power supply 1111 (e.g., a battery) for providing power to various components, and preferably, the power supply 1111 can be logically connected to the processor 1110 via a power management system, so as to manage charging, discharging, and power consumption management functions via the power management system.

In addition, the terminal 1100 includes some functional modules that are not shown, and thus, are not described in detail herein.

Preferably, an embodiment of the present invention further provides a terminal, including a processor 1110, a memory 1109, and a computer program stored in the memory 1109 and capable of running on the processor 1110, where the computer program, when executed by the processor 1110, implements each process of the above-mentioned link establishment method embodiment of the sidelink, and can achieve the same technical effect, and in order to avoid repetition, details are not described here again. A terminal may be a wireless terminal or a wired terminal, and a wireless terminal may be a device providing voice and/or other service data connectivity to a user, a handheld device having a wireless connection function, or other processing devices connected to a wireless modem. Wireless terminals, which may be mobile terminals such as mobile telephones (or "cellular" telephones) and computers having mobile terminals, such as portable, pocket, hand-held, computer-included, or vehicle-mounted mobile devices, may communicate with one or more core networks via a Radio Access Network (RAN), which may exchange language and/or data with the RAN. Examples of such devices include Personal Communication Service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, and Personal Digital Assistants (PDAs). A wireless Terminal may also be referred to as a system, a Subscriber Unit (Subscriber Unit), a Subscriber Station (Subscriber Station), a Mobile Station (Mobile), a Remote Station (Remote Station), a Remote Terminal (Remote Terminal), an Access Terminal (Access Terminal), a User Terminal (User Terminal), a User Agent (User Agent), and a User Device or User Equipment (User Equipment), which are not limited herein.

The embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements each process of the above-mentioned link establishment method for a sidelink, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.

Furthermore, it is to be noted that in the device and method of the invention, it is obvious that the individual components or steps can be decomposed and/or recombined. These decompositions and/or recombinations are to be regarded as equivalents of the present invention. Also, the steps of performing the series of processes described above may naturally be performed chronologically in the order described, but need not necessarily be performed chronologically, and some steps may be performed in parallel or independently of each other. It will be understood by those skilled in the art that all or any of the steps or elements of the method and apparatus of the present invention may be implemented in any computing device (including processors, storage media, etc.) or network of computing devices, in hardware, firmware, software, or any combination thereof, which can be implemented by those skilled in the art using their basic programming skills after reading the description of the present invention.

Thus, the objects of the invention may also be achieved by running a program or a set of programs on any computing device. The computing device may be a general purpose device as is well known. The object of the invention is thus also achieved solely by providing a program product comprising program code for implementing the method or the apparatus. That is, such a program product also constitutes the present invention, and a storage medium storing such a program product also constitutes the present invention. It is to be understood that the storage medium may be any known storage medium or any storage medium developed in the future. It is further noted that in the apparatus and method of the present invention, it is apparent that each component or step can be decomposed and/or recombined. These decompositions and/or recombinations are to be regarded as equivalents of the present invention. Also, the steps of executing the series of processes described above may naturally be executed chronologically in the order described, but need not necessarily be executed chronologically. Some steps may be performed in parallel or independently of each other.

While the preferred embodiments of the present invention have been described, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims.

Claims

1. A method for establishing a side link is applied to a first terminal, and is characterized by comprising the following steps:

receiving a connection establishment response message corresponding to the connection establishment request message; the connection establishment response message is sent by the second terminal when a first preset condition is met;

the connection establishment request message includes at least one of the following information:

layer one capability information of the first terminal,

layer two capability information of the first terminal;

the connection establishment response message includes at least one of the following information:

layer one capability information of the second terminal,

layer two capability information of the second terminal;

the first preset condition includes at least one of:

2. The link establishment method of the sidelink as claimed in claim 1, wherein the connection establishment request message further comprises at least one of the following information:

the identity of the source is identified,

the identification of the purpose is carried out,

the characteristic information to be used for the authentication,

a cause value indicating the cause of the connection establishment request,

security capability information of the first terminal.

3. The link establishment method of the sidelink as claimed in claim 1, wherein the connection establishment response message further comprises at least one of the following information:

the identity of the source is identified,

the identification of the purpose is carried out,

the characteristic information to be used for the authentication,

security capability information of the second terminal.

4. The link establishment method of the sidelink as claimed in claim 1, wherein after the step of sending the connection establishment request message of the sidelink unicast link to the second terminal, the method further comprises:

receiving a connection establishment rejection message corresponding to the connection establishment request message; wherein the connection establishment rejection message is sent by the second terminal when at least one of the first preset conditions is not met.

5. The link establishment method of the sidelink as claimed in claim 4, wherein said connection establishment rejection message comprises at least one of the following information:

the identity of the source is identified,

the identification of the purpose is carried out,

The waiting time of the next connection establishment request message.

6. The link establishment method of the sidelink as claimed in claim 5, wherein the connection establishment rejection reason comprises at least one of:

the authentication is failed and the authentication is not successful,

the capabilities of the second terminal are not supported,

7. The link establishment method of the sidelink as claimed in claim 1 or 4, wherein said first preset condition further comprises at least one of:

the authentication is successful and the authentication is successful,

the second terminal supports at least part of the list of algorithm identifications of the first terminal.

8. The link establishment method of the sidelink as claimed in claim 1, wherein the step of sending a connection establishment request message of the sidelink unicast link to the second terminal comprises:

9. The link establishment method of the sidelink as claimed in claim 8, wherein the second preset condition comprises at least one of:

the existence of available source identifiers indicates the first terminal; and

10. The link establishment method of the sidelink as claimed in claim 1 or 8, wherein the connection establishment request message further carries connection establishment configuration information of a unicast link;

alternatively, the first and second electrodes may be,

after the step of receiving the connection establishment response message sent by the second terminal, the method further includes:

and sending a connection establishment configuration message to the second terminal, wherein the connection establishment configuration message carries the connection establishment configuration information of the unicast link.

11. The link establishment method of the sidelink as claimed in claim 10, wherein the connection establishment configuration information comprises information indicating at least one of:

12. The link establishment method of the sidelink as claimed in claim 10, wherein, when the connection establishment request message further carries connection establishment configuration information of the unicast link, the connection establishment response message further carries connection establishment configuration completion information;

alternatively, the first and second electrodes may be,

after the step of sending the connection setup configuration message to the second terminal, the method further includes:

receiving a connection establishment configuration completion message fed back by the second terminal, wherein the connection establishment configuration completion message carries connection establishment configuration completion information of the unicast link;

13. The link setup method of the sidelink as recited in claim 12, wherein at least one of the connection setup response message, the connection setup configuration message, and the connection setup configuration complete message is transmitted through a dedicated control channel of the sidelink.

14. The method for establishing a link of a sidelink as claimed in claim 10, wherein when the connection establishment request message further carries connection establishment configuration information of a unicast link, after the step of sending the connection establishment request message to the second terminal, the method further comprises:

15. The link setup method of the sidelink as recited in claim 14, wherein the connection setup rejection message comprises: a cause value indicating a connection establishment rejection cause, the connection establishment rejection cause comprising: the second terminal does not support the connection setup configuration information of the first terminal.

16. The link establishment method of the sidelink as claimed in claim 12 or 14, wherein said third predetermined condition comprises at least one of:

17. The link setup method of the sidelink as claimed in claim 4 or 14, wherein said connection setup request message and said connection setup rejection message are transmitted through a common control channel of the sidelink.

18. A method for establishing a side link is applied to a second terminal, and is characterized by comprising the following steps:

when a first preset condition is met, sending a connection establishment response message corresponding to the connection establishment request message to the first terminal;

layer one capability information of the first terminal,

layer two capability information of the first terminal;

layer one capability information of the second terminal,

layer two capability information of the second terminal;

the first preset condition includes at least one of:

19. The link establishment method of the sidelink as claimed in claim 18, wherein the connection establishment request message further comprises at least one of the following information:

the identity of the source is identified,

the identification of the purpose is carried out,

the characteristic information to be used for the authentication,

a cause value indicating the cause of the connection establishment request,

security capability information of the first terminal.

20. The link establishment method of the sidelink as claimed in claim 18, wherein said connection establishment response message further comprises at least one of the following information:

the identity of the source is identified,

the identification of the purpose is carried out,

the characteristic information to be used for the authentication,

security capability information of the second terminal.

21. The method for establishing a sidelink as claimed in claim 18, wherein, after the step of receiving the connection establishment request message of the sidelink unicast link sent by the first terminal, the method further comprises:

and when at least one of the first preset conditions is not met, sending a connection establishment rejection message corresponding to the connection establishment request message to the first terminal.

22. The link establishment method of the sidelink as recited in claim 21, wherein the connection establishment rejection message comprises at least one of the following information:

the identity of the source is identified,

the identification of the purpose is carried out,

The waiting time of the next connection establishment request message.

23. The link establishment method of the sidelink as claimed in claim 22, wherein the connection establishment rejection cause comprises at least one of:

the authentication is failed and the authentication is not successful,

the capabilities of the second terminal are not supported,

the second terminal does not support the configuration of the first terminal,

24. The link establishment method of the sidelink as claimed in claim 18 or 21, wherein the first preset condition further comprises at least one of:

the authentication is successful and the authentication is successful,

25. The link establishment method of the sidelink as claimed in claim 18, wherein the connection establishment request message further carries connection establishment configuration information of a unicast link;

alternatively, the first and second electrodes may be,

after the step of sending the connection establishment response message corresponding to the connection establishment request message to the first terminal, the method further includes:

and receiving a connection establishment configuration message sent by the first terminal, wherein the connection establishment configuration message carries the connection establishment configuration information of the unicast link.

26. The link establishment method of the sidelink as claimed in claim 25, wherein the connection establishment configuration information comprises information indicating at least one of:

27. The method for establishing a link of a sidelink as claimed in claim 25, wherein, when the connection establishment request message further carries connection establishment configuration information of a unicast link, the connection establishment response message further carries connection establishment configuration completion information;

alternatively, the first and second electrodes may be,

after the step of receiving the connection setup configuration message sent by the first terminal, the method further includes:

and feeding back a connection establishment configuration completion message to the first terminal, wherein the connection establishment configuration completion message carries connection establishment configuration completion information of the unicast link.

28. The method for establishing a sidelink as claimed in claim 27, wherein the step of feeding back a connection setup configuration complete message to the first terminal comprises:

29. The link setup method of the sidelink as recited in claim 27, wherein at least one of the connection setup response message, the connection setup configuration message, and the connection setup configuration complete message is transmitted through a dedicated control channel of the sidelink.

30. The method for establishing a link of a side link according to claim 25, wherein when the connection establishment request message further carries the connection establishment configuration information of the unicast link, after the step of receiving the connection establishment request message of the side link unicast link sent by the first terminal, the method further comprises:

31. The link setup method of the sidelink as recited in claim 30, wherein said connection setup rejection message comprises: a cause value indicating a connection establishment rejection cause, the connection establishment rejection cause comprising: the second terminal does not support the connection setup configuration information of the first terminal.

32. The link establishment method of the sidelink as claimed in claim 28 or 30, wherein said third predetermined condition comprises at least one of:

33. The link setup method of the sidelink as claimed in claim 21 or 30, wherein said connection setup request message and said connection setup reject message are transmitted through a common control channel of the sidelink.

34. A terminal, comprising:

a first receiving module, configured to receive a connection establishment response message corresponding to the connection establishment request message; the connection establishment response message is sent by the second terminal when a first preset condition is met;

the layer one capability information of the first terminal,

layer two capability information of the first terminal;

layer one capability information of the second terminal,

layer two capability information of the second terminal;

the first preset condition includes at least one of:

35. The terminal of claim 34, wherein the connection establishment request message further comprises at least one of the following information:

the identity of the source is identified,

the identification of the purpose is carried out,

the characteristic information to be used for the authentication,

a cause value indicating the cause of the connection establishment request,

security capability information of the first terminal.

36. The terminal of claim 34, wherein the connection setup response message further comprises at least one of the following information:

the identity of the source is identified,

the identification of the purpose is carried out,

the characteristic information to be used for the authentication,

security capability information of at least a portion of the first terminal supported by the second terminal,

security capability information of the second terminal.

37. The terminal of claim 34, wherein the terminal further comprises:

38. The terminal according to claim 37, wherein the connection setup reject message comprises at least one of the following information:

the identity of the source is identified,

the identification of the purpose is carried out,

The waiting time of the next connection establishment request message.

39. The terminal of claim 38, wherein the connection establishment rejection reason comprises at least one of:

the authentication is failed and the authentication is not successful,

the capabilities of the second terminal are not supported,

40. The terminal of claim 34, wherein the first sending module comprises:

41. The terminal according to claim 34 or 40, wherein the connection establishment request message further carries connection establishment configuration information of a unicast link;

alternatively, the first and second electrodes may be,

the terminal further comprises:

42. The terminal according to claim 41, wherein the connection setup configuration information comprises information indicating at least one of:

43. The terminal according to claim 41, wherein when the connection establishment request message further carries connection establishment configuration information of a unicast link, the connection establishment response message further carries connection establishment configuration completion information;

alternatively, the first and second electrodes may be,

the terminal further comprises:

44. The terminal of claim 41, wherein the terminal further comprises:

45. The terminal according to claim 44, wherein the connection setup reject message comprises: a cause value indicating a connection establishment rejection cause, the connection establishment rejection cause comprising: the second terminal does not support the connection setup configuration information of the first terminal.

46. A terminal, comprising:

a second sending module, configured to send a connection establishment response message corresponding to the connection establishment request message to the first terminal when a first preset condition is met;

layer one capability information of the first terminal,

layer two capability information of the first terminal;

layer one capability information of the second terminal,

layer two capability information of the second terminal;

the first preset condition includes at least one of:

47. The terminal according to claim 46, wherein the connection establishment request message further comprises at least one of the following information:

the identity of the source is identified,

the identification of the purpose is carried out,

the characteristic information to be used for the authentication,

a cause value indicating the cause of the connection establishment request,

security capability information of the first terminal.

48. The terminal according to claim 46, wherein the connection establishment response message further comprises at least one of the following information:

the identity of the source is identified,

the identification of the purpose is carried out,

the characteristic information to be used for the authentication,

security capability information of at least part of said first terminal supported by the second terminal,

security capability information of the second terminal.

49. The terminal according to claim 46, characterized in that the terminal further comprises:

50. The terminal of claim 49, wherein the connection setup rejection message comprises at least one of the following information:

the identity of the source is identified,

the identification of the purpose is carried out,

The waiting time of the next connection establishment request message.

51. The terminal according to claim 50, wherein the connection establishment rejection reason comprises at least one of:

the authentication is failed and the authentication is not successful,

the capabilities of the second terminal are not supported,

the second terminal does not support the configuration of the first terminal,

52. The terminal according to claim 46, wherein the connection establishment request message further carries connection establishment configuration information of a unicast link;

alternatively, the first and second electrodes may be,

the terminal further comprises:

53. The terminal according to claim 52, wherein the connection setup configuration information comprises information indicating at least one of:

54. The terminal according to claim 52, wherein when the connection establishment request message further carries connection establishment configuration information of a unicast link, the connection establishment response message further carries connection establishment configuration completion information;

alternatively, the first and second electrodes may be,

55. The terminal of claim 54, wherein the feedback module comprises:

56. The terminal of claim 52, wherein the terminal further comprises:

and a fifth sending module, configured to send, to the first terminal, a connection setup rejection message corresponding to the connection setup request message when the second terminal does not satisfy at least one of third preset conditions.

57. The terminal according to claim 56, wherein the connection setup reject message comprises: a cause value indicating a connection establishment rejection cause, the connection establishment rejection cause comprising: the second terminal does not support the connection setup configuration information of the first terminal.

58. A terminal, characterized in that it comprises a processor, a memory and a computer program stored on the memory and running on the processor, which computer program, when executed by the processor, implements the steps of the link establishment method of a sidelink as claimed in any one of claims 1 to 17 or in any one of claims 18 to 33.

59. A computer-readable storage medium, characterized in that a computer program is stored on the computer-readable storage medium, which computer program, when being executed by a processor, carries out the steps of the link establishment method of a sidelink as claimed in any one of claims 1 to 17 or as claimed in any one of claims 18 to 33.