WO2016112551A1 - 一种呼叫建立方法、系统和用户设备 - Google Patents

一种呼叫建立方法、系统和用户设备 Download PDF

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Publication number
WO2016112551A1
WO2016112551A1 PCT/CN2015/070952 CN2015070952W WO2016112551A1 WO 2016112551 A1 WO2016112551 A1 WO 2016112551A1 CN 2015070952 W CN2015070952 W CN 2015070952W WO 2016112551 A1 WO2016112551 A1 WO 2016112551A1
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WIPO (PCT)
Prior art keywords
identifier
call
response message
message
called
Prior art date
Application number
PCT/CN2015/070952
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English (en)
French (fr)
Inventor
杨艳梅
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to KR1020177015040A priority Critical patent/KR20170081218A/ko
Priority to CN201580001910.4A priority patent/CN106105364A/zh
Priority to CA2967854A priority patent/CA2967854A1/en
Priority to PCT/CN2015/070952 priority patent/WO2016112551A1/zh
Priority to EP15877469.5A priority patent/EP3209085A4/en
Publication of WO2016112551A1 publication Critical patent/WO2016112551A1/zh
Priority to US15/612,652 priority patent/US20170273124A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/11—Allocation or use of connection identifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/16—Communication-related supplementary services, e.g. call-transfer or call-hold
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/42025—Calling or Called party identification service
    • H04M3/42034—Calling party identification service
    • H04M3/42059—Making use of the calling party identifier
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices

Definitions

  • the present invention relates to the field of wireless communications technologies, and in particular, to a call setup method, system, and user equipment.
  • Mobile communication is one of the fastest growing, most widely used, and cutting-edge communications areas.
  • the development of mobile communication technology has driven the development of mobile communication services.
  • the mobile communication systems that people usually refer to are mostly public cellular mobile communication systems.
  • a mobile communication system that is, a digital trunking mobile communication system, which is complementary to the public cellular mobile communication system, and the digital trunking mobile communication system is mainly used to perform special dedicated mobile communication services, for example: Traffic dispatching system, civil aviation dispatching system, etc.
  • DMO Direct Mode Operation
  • UE user equipment
  • MCPTT Mission Critical Push To Talk
  • LTE Long Term Evolution
  • DMO group English: group
  • the UE randomly sends a group message in a broadcast mode, and a session has not been established between different UEs (English: Session).
  • Session Each UE does not know which UEs may receive the group message before broadcasting the group message.
  • the broadcast group message is also unsure whether the UE receives the group message, and cannot guarantee to establish a group call between different UEs.
  • a direct mode operation (English: Direct Mode Operation-Relay; abbreviation: DMO-R) is proposed, and the first UE and the group in the group are disconnected by means of the relay UE.
  • a call is established between the second UEs.
  • the relaying UE does not guarantee that all UEs in the group can establish a call with the UE in the off-network situation. For example, a UE that is farther away from the relay UE may not be able to establish a call with the relay UE, resulting in a group. Loss of internal group call setup defeat.
  • the embodiment of the present invention provides a call setup method, a system, and a user equipment, which are used to solve the problem of how to establish a group call in multiple UEs in the case of off-network.
  • a call setup method including:
  • the first user equipment UE broadcasts a call setup message, where the call setup message includes an identifier of the first UE and a called identifier, where the called identifier is used to indicate a group or UE of the first UE call ;
  • the first UE establishes a call connection with the second UE corresponding to the identifier of the second UE according to the received first call response message.
  • the method further includes:
  • the first UE receives the second call response message sent by the second UE, where the second call response message includes an identifier of the third UE, and the second call response message is sent by the third UE to
  • the second call response message of the second UE is used to indicate that the third UE determines to establish a call connection with the first UE by using the second UE, where the third UE is the The UE indicated by the identifier or the UE included in the group indicated by the called identifier.
  • the first call response message further includes an identifier of the first UE
  • the second call response message is determined by the third UE, according to the identifier of the first UE included in the first call response message, when receiving the first call response message that is broadcast by the second UE. Establishing a call connection with the first UE corresponding to the identifier of the first UE, and sending the call connection to the second UE Relaying a connection connection request, establishing a Relay connection with the second UE, and transmitting the result to the second UE.
  • the first UE is broadcast Before the call setup message, the method further includes:
  • the first UE broadcasts a notification message, where the notification message includes the called identifier and a cause value, where the cause value is used to represent the UE indicated by the called identifier or the group indicated by the called identifier
  • the UE included in the group is a paging object of the first UE;
  • the call setup message further includes an identifier of the second UE that sends a notification response message.
  • the first UE receives the first call response message sent by the second UE, including:
  • the first UE receives the 200 ok message sent by the second UE, where the layer 2 Layer 2 target address of the 200 ok message is the Layer 2 address of the group.
  • a call setup method including:
  • the second user equipment UE receives the call setup message broadcast by the first UE, where the call setup message includes an identifier of the first UE and a called identifier, where the called identifier is used to indicate the first UE call Group or UE;
  • the second UE sends a first call response message to the first UE, where the first call response message includes an identifier of the second UE.
  • the second UE is receiving the first UE Before the broadcast call setup message, the method further includes:
  • the notification message that is sent by the first UE, where the notification message includes a called identifier and a cause value, where the cause value is used to represent the UE indicated by the called identifier or the
  • the UE included in the group indicated by the identifier is the paging object of the first UE;
  • the second UE sends a notification response message to the first UE, where the notification response message includes an identifier of the second UE.
  • a call setup method including:
  • the third user equipment UE receives the first call response message that is broadcast by the second UE, where the first call response message includes the identifier of the second UE and the identifier of the first UE, where the identifier of the first UE is Obtained by the second UE from receiving a call setup message broadcast by the first UE;
  • the method further includes:
  • the second UE sends a relay relay connection request, including:
  • the second UE corresponding to the identifier sends a relay Relay connection request.
  • a user equipment is provided, where the user equipment is a first user equipment, including:
  • a signal transmitter configured to broadcast a call setup message, where the call setup message includes an identifier of the first UE and a called identifier, where the called identifier is used to indicate a group of the first UE call or UE;
  • a signal receiver configured to receive a first call response message sent by the second UE, where the first call response message includes an identifier of the second UE, where the first call response message is the Sending, by the second UE, the called identifier to the first UE according to the received call setup message;
  • a processor configured to establish a call connection with the second UE corresponding to the identifier of the second UE according to the received first call response message.
  • the signal receiver is further configured to receive a second call response message sent by the second UE, where the second call response message includes An identifier of the third UE, where the second call response message is sent by the third UE to the second UE, where the second call response message is used to identify that the third UE determines the first UE
  • a call connection is established by the second UE, where the third UE is the UE indicated by the called identifier or the UE included in the group indicated by the called identifier.
  • the first call response message further includes an identifier of the first UE
  • the second call response message is determined by the third UE, according to the identifier of the first UE included in the first call response message, when receiving the first call response message that is broadcast by the second UE. Establishing a call connection by the first UE corresponding to the identifier of the first UE, sending a relay relay connection request to the second UE, establishing a relay connection with the second UE, and performing a second connection to the second UE The UE sent.
  • the signal transmitter is further For broadcasting a notification message before the broadcast call setup message, where the notification message includes the called identifier and a cause value, where the cause value is used to represent the UE indicated by the called identifier or the called
  • the UE included in the group indicated by the identifier is a paging object of the first UE;
  • the signal receiver is further configured to receive a notification response message sent by the second UE, where the notification response message includes an identifier of the second UE, where the notification response message is sent by the second UE And sending according to the reason value included in the notification message and the called identifier;
  • the call setup message further includes an identifier of the second UE that sends a notification response message.
  • the signal receiver is specifically configured to receive a 200 ok message sent by the second UE, where the layer 2 Layer 2 target address of the 200 ok message is a Layer 2 address of the group.
  • a fifth aspect provides a user equipment, where the user equipment is a second user equipment, including:
  • a signal receiver configured to receive a call setup message broadcast by the first UE, where the call setup message includes an identifier of the first UE and a called identifier, where the called identifier is used to indicate the first UE The group or UE of the call;
  • a processor configured to determine, according to the called identifier included in the call setup message, the second UE is a UE indicated by the called identifier or a UE included in a group indicated by the called identifier;
  • a signal transmitter configured to send a first call response message to the first UE, where the first call response message includes an identifier of the second UE.
  • the signal receiver is further configured to: before receiving a call setup message broadcast by the first UE, receive a notification message sent by the first UE, where The notification message includes a called identifier and a cause value, where the reason value is used to represent that the UE indicated by the called identifier or the UE included in the group indicated by the called identifier is a paging of the first UE.
  • the processor is further configured to determine, according to the received identifier that is included in the notification message, that the second UE is the UE indicated by the called identifier or the second UE is the called identifier. Determining the UE included in the indicated group, and determining, according to the received cause value included in the notification message, that the second UE is a paging object of the first UE;
  • the signal transmitter is further configured to send a notification response message to the first UE, where the notification response message includes an identifier of the second UE.
  • the sixth aspect provides a user equipment, where the user equipment is a third user equipment, including:
  • a signal receiver configured to receive a first call response message broadcast by the second UE, where the first call response message includes an identifier of the second UE and an identifier of the first UE, and an identifier of the first UE Obtained by the second UE from receiving a call setup message broadcast by the first UE;
  • a processor configured to determine, according to the received identifier of the first UE included in the first call response message, that the first UE establishes a call connection corresponding to the identifier of the first UE;
  • a signal transmitter configured to send a relay Relay connection request to the second UE
  • the processor is further configured to establish a Relay connection with the second UE;
  • the signal transmitter is further configured to send a second call response message to the second UE, where the second call response message includes an identifier of the third UE.
  • the processor is further configured to: if the signal receiver receives a first call response message that is broadcast by the second UE that is greater than or equal to two, Selecting one of the first call response messages from the received first call response message that is greater than or equal to two;
  • the second UE sends a relay relay connection request, including:
  • a call setup system includes a first user equipment UE and a second UE, where:
  • a first UE configured to broadcast a call setup message, where the call setup message includes an identifier of the first UE and a called identifier, where the called identifier is used to indicate a group or UE of the first UE call;
  • a second UE configured to receive a call setup message that is broadcast by the first UE, and determine, according to the identifier of the called party included in the call setup message, that the second UE is the UE indicated by the called identifier or the The UE included in the group indicated by the called identifier sends a first call response message to the first UE.
  • the call setup system further includes a third UE, where:
  • the second UE is specifically configured to: when determining that the second UE is the UE indicated by the called identifier or the UE included in the group corresponding to the called identifier, broadcast a first call response message;
  • the third UE is configured to receive a first call response message that is broadcast by the second UE, where the first call response message includes an identifier of the second UE and an identifier of the first UE, where the The identifier of the UE is obtained by the second UE from the call setup message that is received by the first UE; according to the identifier of the first UE included in the received first call response message, Determining that the first UE corresponding to the identifier of the first UE establishes a call connection, and sends a relay relay connection request to the second UE;
  • the second UE is further configured to receive a Relay connection request sent by the third UE, and send a connection response message to the third UE;
  • the third UE is further configured to establish a Relay connection with the second UE according to the received connection response message, and send a second call response message to the second UE, where the The identifier of the third UE is included in the second call response message.
  • the first UE is further configured to broadcast a notification before the broadcast call setup message is sent.
  • the notification message includes a called identifier and a cause value, where the cause value is used to represent the UE indicated by the called identifier or the UE included in the group indicated by the called identifier is the a paging object of a UE;
  • the second UE is further configured to receive a notification message that is broadcast by the first UE, and determine, according to the received identifier that is included in the received notification message, that the second UE is the UE indicated by the called identifier Or the second UE is a UE included in the group indicated by the called identifier, and determining, according to the received cause value included in the notification message, that the second UE is a paging of the first UE And sending, by the object, a notification response message to the first UE, where the notification response message includes an identifier of the second UE;
  • the first UE is further configured to receive a notification response message sent by the second UE.
  • the first UE broadcasts a call setup message, where the call setup message includes the identifier of the first UE and the called identifier, where the called identifier is used to indicate the group that the first UE calls or Receiving, by the UE, a first call response message sent by the second UE, where the first call response message includes an identifier of the second UE, where the first call response message is that the second UE is according to the received
  • the called identity that is included in the call setup message is sent to the first UE; according to the received first call response message, the second UE corresponding to the identifier of the second UE establishes a call connection, such that Any UE broadcasts a call setup message in the off-network state, establishes a call connection with other UEs that send a call response in a point-to-point manner, effectively improves the fixed call setup mode in the DMO scenario, and increases the group call setup in the case of off-network. flexibility.
  • FIG. 1 is a schematic flowchart of a call setup method provided by the present invention
  • FIG. 2 is a schematic flowchart of a call setup method provided by the present invention
  • FIG. 3 is a schematic flowchart diagram of a call setup method according to the present invention.
  • FIG. 4 is a schematic flowchart of a call setup method provided by the present invention.
  • FIG. 5 is a schematic structural diagram of a user equipment according to the present invention.
  • FIG. 6 is a schematic structural diagram of a user equipment according to the present invention.
  • FIG. 7 is a schematic structural diagram of a user equipment according to the present invention.
  • FIG. 8 is a schematic structural diagram of a user equipment according to the present invention.
  • FIG. 9 is a schematic structural diagram of a call setup system provided by the present invention.
  • an embodiment of the present invention provides a call setup method, a system, and a user equipment, by using a first UE to broadcast a call setup message, where the call setup message includes the identifier and called of the first UE.
  • An identifier is used to indicate a group or a UE that is called by the first UE, and receives a first call response message sent by the second UE, where the first call response message includes an identifier of the second UE
  • the first call response message is sent by the second UE to the first UE according to the received call identifier included in the received call setup message; according to the received first call response a message, the second UE corresponding to the identifier of the second UE establishes a call connection, so that any UE broadcasts a call setup message in an off-network state, and establishes a call connection with other UEs that send a call response in a point-to-point manner, thereby effectively improving Fixed call setup in DMO scenarios, increasing the flexibility of group call setup in off-network situations.
  • the called identifier in the embodiment of the present invention may refer to the identifier of the called UE, or may be the identifier of the group in which the called UE is located.
  • the identifier of the group may refer to the identity of the group (English: Identity), or the Internet Protocol (English: Internet Protocol; abbreviation: IP) address of the group, or other information that can identify the group. There is no limit here.
  • FIG. 1 is a schematic flowchart diagram of a call setup method according to an embodiment of the present invention. The method can be as follows.
  • Step 101 The first UE broadcasts a call setup message.
  • the call setup message includes an identifier of the first UE and a called identifier, where the called identifier is used to indicate a group or a UE that is called by the first UE.
  • the called identifier included in the call setup message is an identifier of the group; if the object of the first UE call is a UE, the call setup message includes The called identifier is the identifier of the UE.
  • the called identifier is the identifier of the UE, it may be an identifier of one UE, or may be an identifier of multiple UEs, where the number of identifiers of the UE is not limited.
  • the first UE may be any one of the groups, and has the function of actively initiating a group call.
  • the first UE determines the target group that initiates the group call, and then the group identifier of the determined target group is carried as a called identity in a call setup message and sent by broadcast.
  • the first UE determines to call at least one other UE in a group, and then the identifier of the other UE that determines the call is carried as a called identity in a call setup message and is sent by broadcast.
  • the first UE when determining to initiate the call, encapsulates the call request, the identifier of the first UE, the called identifier, and the protocol message header that carries the call request into an application layer call setup message, and sends the call setup by broadcast. Message.
  • the first UE when determining to initiate the call, broadcasts a Session Initiation Protocol (SIP) signaling, where the SIP signaling is used to indicate that the first UE initiates a call setup request.
  • SIP Session Initiation Protocol
  • the SIP signaling includes an identifier of the first UE and a called identifier.
  • call setup message can also be extended by means of 1:m group communication defined by the 3rd Generation Partnership Project (3GPP) rel12.
  • 3GPP 3rd Generation Partnership Project
  • the implementation is implemented by adopting 1:m communication mode to carry SIP signaling.
  • Step 102 The first UE receives a first call response message sent by the second UE.
  • the first call response message includes an identifier of the second UE, where the first call response message is sent by the second UE according to the received call identifier included in the received call setup message.
  • the first UE sends.
  • step 102 at least one second UE exists in the vicinity of the first UE, and when receiving the call setup message broadcast by the first UE, the second UE parses the call setup message to obtain call request signaling and called identity.
  • the first UE Determining, by the second UE, whether it is the call object of the first UE according to the obtained called identity, and if yes, determining whether to receive the call request according to the call request signaling, and when determining to accept the current call, to the The first UE sends a first call response message.
  • the first call response message may be in the form of a 200 ok message, where the target address of the Layer 2 is the layer 2 identifier of the group, or may be the layer 2 identifier of the first UE.
  • the first call response message may also be carried in a 1:m communication group broadcast message.
  • the Layer 2 target address of the 1:m communication group broadcast message is the layer 2 address of the group.
  • Step 103 The first UE establishes a call connection with the second UE corresponding to the identifier of the second UE according to the received first call response message.
  • step 103 when the first UE receives the first call response message sent by the multiple second UEs, the first UE determines to respond to the current call according to each received first call response message.
  • the plurality of second UEs establish a call connection with each of the second UEs when it is determined that the plurality of second UEs responding to the current call reach the set call setup condition.
  • the first UE determines, according to each received first call response message, the number of second UEs responding to the current call, A call connection with each of the second UEs is established when it is determined that the number of second UEs responding to the current call reaches the number of UEs of the set call setup requirements.
  • the first UE sends an acknowledgement message of the application layer to each second UE when determining to establish a call connection with each second UE.
  • the determining message may be an acknowledgement (English: Acknowledgement; abbreviation: ACK) message, or may be other messages.
  • the manner in which the first UE sends an acknowledgement message of the application layer to each second UE may adopt a point-to-point transmission manner.
  • a session state message may also be sent to each second UE during the group session.
  • the session status message includes an identifier of each second UE participating in the session, so that each second UE participating in the session can determine which UEs are ready to participate in the session and which UEs exit the session.
  • the session state message may be a SIP Information/Notify message.
  • the manner in which the first UE sends the session state message may be a broadcast mode, a point-to-point transmission mode, or a point-to-multipoint mode, which is not limited herein.
  • the first user equipment can perform voice control (English: Floor Control), that is, receive a session request of each second UE, determine the order of each second UE to perform the session, and The voice or media sent by the second UE that is speaking is sent to other second UEs in a point-to-point or point-to-multipoint manner.
  • voice control English: Floor Control
  • a group includes UE1, UE2, UE3, and UE4, and UE1, as a call initiator, receives voice or media data sent by UE2, and passes the received voice or media data sent by UE2 through point-to-point or point.
  • the multipoint mode is separately sent to UE3 and UE4.
  • the first UE broadcasts a call setup message, where the call setup message includes an identifier of the first UE and a called identifier, where the called identifier is used to indicate the first UE.
  • Receiving a group or UE of the call receiving a first call response message sent by the second UE, where the first call response message includes an identifier of the second UE, where the first call response message is Receiving, by the received call setup message, the called identifier sent to the first UE; according to the received first call response message, a second UE corresponding to the identifier of the second UE Establish a call connection, so that any UE broadcasts a call setup message in an off-network state, in a peer-to-peer manner
  • the call connection is established with other UEs that send call responses, which effectively improves the fixed call setup mode in the DMO scenario, and increases the flexibility of group call setup in the case of off-network.
  • FIG. 2 is a schematic structural diagram of a call setup method according to an embodiment of the present invention.
  • the solution described in the embodiment of the present invention is based on the embodiment described in FIG. 1.
  • the third UE can receive the first by freely selecting.
  • the second UE of the call setup message broadcasted by the UE acts as a relay, and implements a relay straight-through between the third UE and the first UE.
  • the method can be as follows.
  • Step 201 The first UE broadcasts a call setup message.
  • the call setup message includes an identifier of the first UE and a called identifier, where the called identifier is used to indicate a group or a UE that is called by the first UE.
  • Step 202 The second UE receives the call setup message broadcast by the first UE, and broadcasts the first call response message when it is determined to accept the current call.
  • the first call response message is carried in a group broadcast message of 1:m communication, and the Layer 2 target address of the 1:m communication group broadcast message is the Layer 2 address of the group.
  • the second UE determines, according to the called identifier included in the call setup message, that the second UE is included in the UE indicated by the called identifier or the group indicated by the called identifier. UE; and when it is determined to accept the call, broadcast the first call response message.
  • the identifier of the second UE and the identifier of the first UE in the first call response message are mapped to the first call response message.
  • the identifier of the first UE is obtained by the second UE from receiving a call setup message broadcast by the first UE.
  • Step 203 The first UE receives a first call response message broadcast by the second UE.
  • Step 204 The third UE receives the first call response message broadcast by the second UE.
  • the third UE is the UE indicated by the called identifier or the UE included in the group indicated by the called identifier, and cannot receive the call setup message broadcast by the first UE, but can The first call response message broadcast by the second UE is received.
  • the third UE parses the first call response message, obtains the identifier of the first UE, and determines the call originator.
  • the second UE receives the first call response message in a broadcast manner, and if the multiple second UEs send the first call response message in a broadcast manner, the third UE receives the first call response message greater than or equal to two.
  • the call response message at this time, the third UE selects one of the first call response messages from the received first call response message that is greater than or equal to two.
  • the manner in which the third UE selects the first call response message may be based on the received signal strength or signal quality of the first call response message, and the first call response message with the highest signal strength or the best signal quality is selected as the priority mode. No restrictions on how to choose.
  • the third UE determines, according to the identifier of the first UE that is included in the first call response message that is selected, whether to establish a call connection with the first UE corresponding to the identifier of the first UE.
  • the third UE described in the embodiment of the present invention is not limited to one UE, but is a type of UE, and the UE has the UE indicated by the called identifier included in the call setup message sent by the first UE. However, the call setup message sent by the first UE cannot be directly received.
  • Step 205 The third UE sends a Relay connection request to the second UE when determining that the first UE corresponding to the identifier of the first UE establishes a call connection.
  • the relay connection request includes an identifier of the third UE.
  • step 205 if the third UE performs an operation of selecting a first call response message in step 204, then in step 205, the third UE determines the first corresponding to the identifier of the first UE.
  • the relay connection request is sent to the second UE corresponding to the identifier of the second UE according to the identifier of the second UE that is included in the selected first call response message.
  • Step 206 Establish a Relay connection between the third UE and the second UE, and send a second call response message to the second UE.
  • the second call response message includes an identifier of the third UE.
  • the second UE forwards the received call setup message broadcast by the first UE to the third UE.
  • Step 207 The second UE receives the third UE to send a second call response message, and forwards the second call response message to the first UE.
  • Step 208 The first UE receives a second call response message sent by the second UE.
  • the second call response message includes an identifier of a third UE, where the second call response message is sent by the third UE to the second UE, where the second call response message is used to identify the
  • the third UE determines to establish a call connection with the first UE by using the second UE, where the third UE is the UE indicated by the called identifier or the UE included in the group indicated by the called identifier .
  • Step 209 The first UE establishes a call connection between the second UE and the third UE according to the received second call response message, and according to the received first call response message. Establishing a call connection with the second UE.
  • FIG. 3 is a schematic flowchart diagram of a call setup method according to an embodiment of the present invention.
  • the call setup method in the embodiment of the present invention is similar to the call setup method described in FIG. 2, but the execution flow is different.
  • the method can be as follows.
  • Step 301 The first UE broadcasts a call setup message.
  • the call setup message includes an identifier of the first UE and a called identifier, where the called identifier is used to indicate a group or a UE that is called by the first UE.
  • Step 302 The second UE receives a call setup message broadcast by the first UE, and sends a first call response message to the first UE when determining to accept the current call.
  • the second UE determines, according to the called identifier included in the call setup message, that the second UE is included in the UE indicated by the called identifier or the group indicated by the called identifier. And receiving a first call response message to the first UE when determining to accept the current call.
  • the identifier of the second UE in the first call response message is referred to.
  • Step 303 The first UE receives a first call response message sent by the second UE.
  • Step 304 The second UE determines, according to the received called identifier included in the call setup message, that the third UE is included in the UE indicated by the called identifier or the group indicated by the called identifier.
  • the UE forwards the call setup message broadcast by the first UE to the third UE.
  • the second UE determines, according to the received called identifier included in the call setup message, that the third UE is the UE indicated by the called identifier or the group indicated by the called identifier.
  • the manner of the included UE includes but is not limited to:
  • the second UE determines, by using a point-to-point manner, that the third UE has not received the call setup message broadcast by the first UE, and determines that the third UE is the UE indicated by the called identifier or the group indicated by the called identifier. UE included in.
  • Step 305 The third UE receives the call setup message forwarded by the second UE.
  • the third UE is the UE indicated by the called identifier or the UE included in the group indicated by the called identifier, and cannot receive the call setup message broadcast by the first UE, but may pass the The second UE receives the call setup message broadcast by the first UE.
  • the third UE determines whether to establish a call connection with the first UE corresponding to the identifier of the first UE, according to the identifier of the first UE that is included in the received call setup message.
  • the third UE described in the embodiment of the present invention is not limited to one UE, but is a type of UE, and the UE has the UE indicated by the called identifier included in the call setup message sent by the first UE. However, the call setup message sent by the first UE cannot be directly received.
  • Step 306 The third UE sends a Relay connection request to the second UE when determining that the first UE corresponding to the identifier of the first UE establishes a call connection.
  • the relay connection request includes an identifier of the third UE.
  • Step 307 A relay connection is established between the third UE and the second UE, and a second call response message is sent to the second UE.
  • the second call response message includes an identifier of the third UE.
  • Step 308 The second UE receives the third UE to send a second call response message, and The second call response message is forwarded to the first UE.
  • Step 309 The first UE receives a second call response message sent by the second UE.
  • the second call response message includes an identifier of a third UE, where the second call response message is sent by the third UE to the second UE, where the second call response message is used to identify the
  • the third UE determines to establish a call connection with the first UE by using the second UE, where the third UE is the UE indicated by the called identifier or the UE included in the group indicated by the called identifier .
  • Step 310 The first UE establishes a call connection between the second UE and the third UE according to the received second call response message, and according to the received first call response message. Establishing a call connection with the second UE.
  • the second UE is used as a relay for establishing a call between the first UE and the third UE, and the relay may be in the first level in the embodiment of the present invention. It can also be a multi-level relay, which is not limited here.
  • a call connection includes: UE1, UE2, and UE3, then UE2 acts as a relay for establishing a call between UE1 and UE3;
  • a call connection includes: UE1, UE2, UE3, and UE4, then UE2 is used as UE1 and UE3.
  • the call setup relay, UE3 acts as a relay for call setup between UE2 and UE4, and UE2 and UE3 act as relays for call setup between UE1 and UE4.
  • any UE broadcasts a call setup message in an off-network state, and establishes a call connection with other UEs that send a call response in a point-to-point manner; if there is a call setup message that the called object cannot receive the caller
  • the called object can select a called object that can receive the call setup message of the calling party from itself as a relay to establish a call connection with the calling party, and establish a call connection with the calling party, thereby effectively improving the DMO scenario.
  • the fixed call setup mode increases the flexibility of group call setup in the case of off-network.
  • FIG. 4 is a schematic flowchart diagram of a call setup method according to an embodiment of the present invention. The method can be as follows.
  • Step 401 The first UE broadcasts a notification message.
  • the notification message includes the called identifier and a cause value, where the cause value is used to represent that the UE indicated by the called identifier or the UE included in the group indicated by the called identifier is the One The paging object of the UE.
  • the notification message may be sent by using a group member discovery method or a paging (English: Paging) method, which is not limited herein.
  • step 401 the first UE looks for the called object by using a notification message before initiating the call setup.
  • the notification group ID (English: announcing group ID)
  • the group members who may respond to the call are determined.
  • the notification message may include a group identifier, and may also include an identifier of the called UE, which is not limited herein.
  • the notification information may further include an identifier of the first UE, for example, an ID of the first UE and address information of the first UE, for example, an IP address or the like.
  • the reason value included in the notification message is such that when the notification message broadcast by the first UE is received, the purpose of the first UE to send the notification message is determined, so that the response may be responded to according to the called identifier included in the received notification message.
  • Step 402 The second UE receives the notification message, and when determining to respond to the paging, sends a connection request to the first UE, and establishes a direct connection with the first UE (eg, device and device). To Device; abbreviation: D2D) connection).
  • D2D To Device; abbreviation: D2D
  • the second UE is not limited to one UE, but is a type of UE, that is, a UE capable of establishing a call connection directly with the first UE.
  • the manner in which the second UE determines to respond to the paging includes:
  • the notification response message includes an identifier of the second UE.
  • the first UE receives a notification response message sent by the second user equipment.
  • the second UE sends a first registration request to the first UE.
  • the first registration request includes an identifier of the second UE.
  • the manner in which the second UE sends the first registration request may be in a broadcast mode or a rel121:m group broadcast mode.
  • the first registration request includes an identifier of the first UE.
  • Step 404 The third UE receives the first registration request sent by the second UE, and determines, according to the identifier of the first UE included in the first registration request, a first corresponding to the identifier of the first UE.
  • the UE establishes a call connection and sends a Relay Connection Request to the second UE.
  • the relay connection request includes the third user equipment identifier.
  • Step 405 Establish a Relay connection between the third UE and the second UE, and send a second registration request to the second UE.
  • the second registration request includes an identifier of the third UE.
  • steps 404 to 405 in the embodiment of the present invention are not mandatory steps, but are preferred steps.
  • the purpose of step 404 and step 405 in the embodiment of the present invention is to determine that the second UE is a relay established by a call between the first UE and the third UE. To achieve this, in addition to using step 404 in the embodiment of the present invention.
  • the implementations described in steps 304 to 307 of FIG. 3 may also be employed, with the difference that the messages of the interaction are different.
  • Step 406 The first UE receives the first registration request and the second registration request sent by the second UE.
  • Step 407 The first UE broadcasts a call setup message to the registered second UE.
  • the call setup message includes an identifier of the first UE and a called identifier.
  • the manner in which the first UE sends the call setup message to the registered second UE may be a point-to-point manner or a broadcast mode, which is not limited herein.
  • the call setup message broadcasted by the first UE may be a session invite (English: SIP invite) message, where the SIP invite message may include an identifier of the called UE, for example, an identifier of the second UE, and an identifier of the third UE.
  • SIP invite International Mobile Subscriber
  • the second UE determines the session invitation when receiving the SIP invite message.
  • the UE is forwarded to the third UE at this time.
  • Step 408 The first UE receives the first call response message and the second call response message sent by the second UE, and establishes a call connection with the second UE and the third UE.
  • the second call response message is sent by the third UE to the second UE.
  • Step 409 The first UE sends an acknowledgement message to the second UE.
  • FIG. 5 is a schematic structural diagram of a user equipment according to an embodiment of the present invention.
  • the user equipment can be implemented using a general purpose computer architecture.
  • the user equipment includes a signal transmitter 51, a processor 52, and a signal receiver 53.
  • the signal transmitter 51, the processor 52, and the signal receiver 53 can be connected via a bus.
  • the functions of the user equipment in the embodiment of the present invention may be roughly classified into three types: a first type is a first UE that initiates a call actively; a second type is a second UE that can directly establish a call with the first UE; The call cannot be established directly with the first UE, but the second UE can be selected as a relay to establish a call with the first UE.
  • the user equipment includes:
  • the signal transmitter 51 is configured to broadcast a call setup message, where the call setup message includes an identifier of the first UE and a called identifier, where the called identifier is used to indicate a group of the first UE call Or UE;
  • a signal receiver 53 configured to receive a first call response message sent by the second UE, where the first call response message includes an identifier of the second UE, where the first call response message is Sending, by the second UE, the called identifier to the first UE according to the received call setup message;
  • the processor 52 is configured to establish a call connection with the second UE corresponding to the identifier of the second UE according to the received first call response message.
  • the signal receiver 53 is further configured to receive a second call response message sent by the second UE, where the second call response message includes an identifier of the third UE, where the second call The response message is sent by the third UE to the second UE, where the second call response message is used to indicate that the third UE determines to establish a call with the first UE by using the second UE. Connection, said The third UE is the UE indicated by the called identifier or the UE included in the group indicated by the called identifier.
  • the first call response message further includes an identifier of the first UE
  • the second call response message is determined by the third UE, according to the identifier of the first UE included in the first call response message, when receiving the first call response message that is broadcast by the second UE. Establishing a call connection by the first UE corresponding to the identifier of the first UE, sending a relay relay connection request to the second UE, establishing a relay connection with the second UE, and performing a second connection to the second UE The UE sent.
  • the signal transmitter 51 is further configured to: before the broadcast call setup message, broadcast a notification message, where the notification message includes the called identifier and a cause value, where the cause value is used to represent the location Decoding the UE indicated by the called identifier or the UE included in the group indicated by the called identifier as a paging object of the first UE;
  • the signal receiver 53 is further configured to receive a notification response message sent by the second UE, where the notification response message includes an identifier of the second UE, and the notification response message is by the second Transmitting, by the UE, according to the reason value included in the notification message and the called identifier;
  • the call setup message further includes an identifier of the second UE that sends a notification response message.
  • the signal receiver 53 is specifically configured to receive the 200 ok message sent by the second UE, where the layer 2 Layer 2 target address of the 200 ok message is the Layer 2 address of the group.
  • the user equipment includes:
  • the signal receiver 53 is configured to receive a call setup message that is broadcast by the first UE, where the call setup message includes an identifier of the first UE and a called identifier, where the called identifier is used to indicate the first a group or UE that the UE calls;
  • the processor 52 is configured to determine, according to the called identifier included in the call setup message, that the second UE is the UE indicated by the called identifier or the UE included in the group indicated by the called identifier;
  • the signal transmitter 51 is configured to send a first call response message to the first UE, where the first call response message includes an identifier of the second UE.
  • the signal receiver 53 is further configured to: before receiving the call setup message broadcast by the first UE, receive the notification message sent by the first UE, where the notification message includes the called identifier And a cause value, where the cause value is used to indicate that the UE indicated by the called identifier or the UE included in the group indicated by the called identifier is a paging object of the first UE;
  • the processor 52 is further configured to determine, according to the received identifier that is included in the notification message, that the second UE is the UE indicated by the called identifier or the second UE is the called Determining, by the UE included in the indicated group, determining, according to the received cause value included in the notification message, that the second UE is a paging object of the first UE;
  • the signal transmitter 51 is further configured to send a notification response message to the first UE, where the notification response message includes an identifier of the second UE.
  • the user equipment includes:
  • the signal receiver 53 is configured to receive a first call response message that is broadcast by the second UE, where the first call response message includes an identifier of the second UE and an identifier of the first UE, where the first UE is The identifier is obtained by the second UE from receiving a call setup message broadcast by the first UE;
  • the processor 52 is configured to determine, according to the identifier of the first UE that is included in the received first call response message, that the first UE that establishes a call connection corresponding to the identifier of the first UE is established;
  • a signal transmitter 51 configured to send a relay relay connection request to the second UE
  • the processor 52 is further configured to establish a Relay connection with the second UE.
  • the signal transmitter 51 is further configured to send a second call response message to the second UE, where the second call response message includes an identifier of the third UE.
  • the processor 52 is further configured to: if the signal receiver receives the first call response message broadcast by the second UE that is greater than or equal to two, from the received greater than or equal to two In the first call response message, selecting one of the first call response messages;
  • the processor 52 determines that the first UE corresponding to the identifier of the first UE establishes a call connection according to the identifier of the first UE that is included in the received first call response message, and sends a call connection to the first UE.
  • the second UE sends a relay relay connection request, including:
  • the processor 52 can be a general purpose central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the program of the present invention. .
  • CPU general purpose central processing unit
  • ASIC application-specific integrated circuit
  • the user equipment in the embodiment of the present invention may be implemented by using a hardware, or may be implemented by using a software, which is not limited herein.
  • the function of the user equipment described in the embodiment of the present invention selects the function of the corresponding role when the user equipment functions as a different role, and not all functions are used at the same time.
  • FIG. 6 is a schematic structural diagram of a user equipment according to an embodiment of the present invention.
  • the user equipment is the first UE described in the embodiment of the present invention, and includes: a broadcasting unit 61, a receiving unit 62, and a call establishing unit 63, where:
  • the broadcast unit 61 is configured to broadcast a call setup message, where the call setup message includes an identifier of the first UE and a called identifier, where the called identifier is used to indicate a group of the first UE call or UE;
  • the receiving unit 62 is configured to receive the first call response message sent by the second UE, where the first call response message includes an identifier of the second UE, where the first call response message is The second UE sends the called identity included in the call setup message broadcasted by the broadcast unit 61 to the first UE;
  • the call establishing unit 63 is configured to establish a call connection with the second UE corresponding to the identifier of the second UE according to the first call response message received by the receiving unit 62.
  • the receiving unit 62 is further configured to receive a second call response message sent by the second UE, where the second call response message includes an identifier of the third UE, where the second call response The message is sent by the third UE to the second UE, where the second call response message is used to indicate that the third UE determines to establish a call connection with the first UE by using the second UE.
  • the third UE is the UE indicated by the called identifier or the UE included in the group indicated by the called identifier.
  • the first call response message further includes an identifier of the first UE
  • the second call response message is that the third UE receives the first call broadcast by the second UE
  • the response message is sent, determining, according to the identifier of the first UE included in the first call response message, that the first UE corresponding to the identifier of the first UE establishes a call connection to the second UE. And sending a relay connection connection request, establishing a relay connection with the second UE, and sending the result to the second UE.
  • the broadcast unit 61 is further configured to: before the broadcast call setup message, broadcast a notification message, where the notification message includes the called identifier and a cause value, where the cause value is used to represent the The UE indicated by the called identifier or the UE included in the group indicated by the called identifier is a paging object of the first UE;
  • the receiving unit 62 is further configured to receive the notification response message sent by the second UE, where the notification response message includes an identifier of the second UE, where the notification response message is sent by the second UE And sending according to the reason value included in the notification message and the called identifier;
  • the call setup message further includes an identifier of the second UE that sends a notification response message.
  • the receiving unit 62 is specifically configured to receive a 200 ok message sent by the second UE, where the layer 2 Layer 2 target address of the 200 ok message is a Layer 2 address of the group.
  • FIG. 7 is a schematic structural diagram of a user equipment according to an embodiment of the present invention.
  • the user equipment is a second user equipment UE, and includes: a receiving unit 71, a determining unit 72, and a sending unit 73, where:
  • the receiving unit 71 is configured to receive a call setup message that is broadcast by the first UE, where the call setup message includes an identifier of the first UE and a called identifier, where the called identifier is used to indicate the first UE The group or UE of the call;
  • a determining unit 72 configured to determine, according to the called identifier included in the call setup message received by the receiving unit 71, that the second UE is indicated by the UE indicated by the called identifier or the called identifier UEs included in the group;
  • the sending unit 73 is configured to send a first call response message to the first UE, where the first call response message includes an identifier of the second UE.
  • the receiving unit 71 is further configured to: before receiving the call setup message broadcast by the first UE, receive the notification message sent by the first UE, where the notification message includes the called identifier and the cause value, where The reason value is used to represent the UE indicated by the called identifier or the group indicated by the called identifier
  • the UE included in the UE is a paging object of the first UE;
  • the determining unit 72 is further configured to determine, according to the received called identifier included in the notification message, that the second UE is the UE indicated by the called identifier or the second UE is the called Determining, by the UE included in the indicated group, determining, according to the received cause value included in the notification message, that the second UE is a paging object of the first UE;
  • the sending unit 73 is further configured to send a notification response message to the first UE, where the notification response message includes an identifier of the second UE.
  • FIG. 8 is a schematic structural diagram of a user equipment according to an embodiment of the present invention.
  • the user equipment is a third user equipment UE, and includes: a receiving unit 81, a determining unit 82, a sending unit 83, and a establishing connection unit 84, where:
  • the receiving unit 81 is configured to receive a first call response message that is broadcast by the second UE, where the first call response message includes an identifier of the second UE and an identifier of the first UE, and an identifier of the first UE Obtained by the second UE from receiving a call setup message broadcast by the first UE;
  • a determining unit 82 configured to determine, according to the received identifier of the first UE included in the first call response message, that the first UE that establishes a call connection corresponding to the identifier of the first UE establishes a call connection;
  • a sending unit 83 configured to send a relay relay connection request to the second UE
  • Establishing a connection unit 84 configured to establish a Relay connection with the second UE
  • the sending unit 83 is further configured to send a second call response message to the second UE, where the second call response message includes an identifier of the third UE.
  • the user equipment further includes: a selecting unit 85, where:
  • the selecting unit 85 is further configured to: if the signal receiver receives the first call response message broadcast by the second UE that is greater than or equal to two, the first one is greater than or equal to two received In the call response message, selecting one of the first call response messages;
  • the determining unit 82 is configured to determine, according to the identifier of the first UE that is included in the selected first call response message, that the first UE that establishes a call connection corresponding to the identifier of the first UE is established;
  • the sending unit 83 is specifically configured to: according to the selected one of the first call response messages And determining, by the identifier of the second UE, a relay relay connection request to the second UE corresponding to the identifier of the second UE.
  • FIG. 9 is a schematic structural diagram of a call setup system according to an embodiment of the present invention.
  • the call setup system includes a first user equipment UE91 and a second UE92, wherein:
  • a first UE 91 configured to broadcast a call setup message, where the call setup message includes an identifier of the first UE and a called identifier, where the called identifier is used to indicate a group or UE of the first UE call;
  • a second UE 92 configured to receive a call setup message broadcast by the first UE, and determine, according to the identifier of the called party included in the call setup message, that the second UE is the UE indicated by the called identifier or the The UE included in the group indicated by the called identifier sends a first call response message to the first UE.
  • the call setup system further includes a third UE 93, where:
  • the second UE 92 is configured to: when determining that the second UE is the UE indicated by the called identifier or the UE included in the group corresponding to the called identifier, broadcast a first call response message;
  • the third UE 93 is configured to receive a first call response message that is broadcast by the second UE, where the first call response message includes an identifier of the second UE and an identifier of the first UE, where the The identifier of the UE is obtained by the second UE from the call setup message that is received by the first UE; according to the identifier of the first UE included in the received first call response message, Determining that the first UE corresponding to the identifier of the first UE establishes a call connection, and sends a relay relay connection request to the second UE;
  • the second UE 92 is further configured to receive a Relay connection request sent by the third UE, and send a connection response message to the third UE;
  • the third UE 93 is further configured to establish a Relay connection with the second UE according to the received connection response message, and send a second call response message to the second UE, where the The identifier of the third UE is included in the second call response message.
  • the first UE 91 is further configured to broadcast a notification message before the broadcast call setup message is received.
  • the notification message includes a called identifier and a cause value, where the cause value is used to represent that the UE indicated by the called identifier or the UE included in the group indicated by the called identifier is the first UE.
  • Paging object
  • the second UE 92 is further configured to receive the notification message that is broadcast by the first UE, and determine, according to the received identifier that is included in the received notification message, that the second UE is the UE indicated by the called identifier. Or the second UE is a UE included in the group indicated by the called identifier, and determining, according to the received cause value included in the notification message, that the second UE is a paging of the first UE And sending, by the object, a notification response message to the first UE, where the notification response message includes an identifier of the second UE;
  • the first UE 91 is further configured to receive a notification response message sent by the second UE.
  • embodiments of the present invention can be provided as a method, apparatus (device), or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.
  • a computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that A series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing such that instructions executed on a computer or other programmable device are provided for implementing one or more processes and/or block diagrams in the flowchart The steps of a function specified in a box or multiple boxes.

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Abstract

本发明公开了一种呼叫建立方法、系统和用户设备，包括：第一UE广播呼叫建立消息，呼叫建立消息中包含第一UE的标识和被叫标识，被叫标识用于指示第一UE呼叫的群组或者UE；接收第二UE发送的第一呼叫响应消息，第一呼叫响应消息中包含所述第二UE的标识，第一呼叫响应消息是第二UE根据接收到的呼叫建立消息中包含的被叫标识向第一UE发送的；根据接收到的第一呼叫响应消息，与第二UE的标识对应的第二UE建立呼叫连接，这样任意的UE在脱网状态下广播呼叫建立消息，通过点对点方式与发送呼叫响应的其他UE建立呼叫连接，有效地改善DMO场景中固定的呼叫建立方式，增加在脱网情况下群组呼叫建立的灵活性。

Description

一种呼叫建立方法、系统和用户设备 技术领域
本发明涉及无线通信技术领域，尤其涉及一种呼叫建立方法、系统和用户设备。
背景技术
移动通信是当前发展最快、应用最广、技术最前沿的通信领域之一。移动通信技术的发展带动了移动通信业务的发展。然而，人们平时提到的移动通信系统大都是指公众蜂窝移动通信系统。在现有的移动通信系统中，还存在一种移动通信系统，即数字集群移动通信系统，作为公众蜂窝移动通信系统的补充，数字集群移动通信系统主要用于执行特殊专用移动通信业务，例如：交通调度系统、民航调度系统等。
在数字集成移动通信系统中存在一种业务，即直通呼叫(英文：Direct Mode Operation；缩写：DMO)业务。DMO业务是指在没有集群系统的参与，不同用户设备(英文：user equipment；缩写：UE)之间建立群组呼叫。例如：在长期演进(英文：Long Term Evolution；缩写：LTE)通信网络架构下提出的键通功能业务(英文：the Mission Critical Push To Talk；缩写：MCPTT)。
具体地，在MCPTT的应用中存在一种DMO的群组(英文：group)场景。在该group场景中，UE采用广播模式随机发送群组消息，不同UE之间尚未建立会话(英文：Session)，每一个UE在广播群组消息之前并不知道哪些UE可能接收到该群组消息，以及在广播群组消息之后也不确定有没有UE接收到该群组消息，不能保证建立不同UE之间的群组呼叫。
再者，在group场景的基础之上，又提出了中继直通(英文：Direct Mode Operation-Relay；缩写：DMO-R)，通过借助中继UE实现group内脱网的第一UE与group内的第二UE之间建立呼叫。但是在实际应用中，中继UE并不能保证在脱网情况下group内的所有UE都能与其建立呼叫，例如，距离中继UE比较远的UE可能无法与该中继UE建立呼叫，导致group内群组呼叫建立的失 败。
由此可见，亟需一种呼叫建立方法，用于解决多个UE在脱网情况下如何建立群组呼叫的问题。
发明内容
有鉴于此，本发明实施例提供了一种呼叫建立方法、系统和用户设备，用于解决多个UE在脱网情况下如何建立群组呼叫的问题。
第一方面，提供了一种呼叫建立方法，包括：
第一用户设备UE广播呼叫建立消息，其中，所述呼叫建立消息中包含所述第一UE的标识和被叫标识，所述被叫标识用于指示所述第一UE呼叫的群组或者UE；
所述第一UE接收第二UE发送的第一呼叫响应消息，其中，所述第一呼叫响应消息中包含所述第二UE的标识，所述第一呼叫响应消息是所述第二UE根据接收到的所述呼叫建立消息中包含的所述被叫标识向所述第一UE发送的；
所述第一UE根据接收到的所述第一呼叫响应消息，与所述第二UE的标识对应的第二UE建立呼叫连接。
结合第一方面，在第一种可能的实施方式中，所述方法还包括：
所述第一UE接收所述第二UE发送的第二呼叫响应消息，其中，所述第二呼叫响应消息中包含第三UE的标识，所述第二呼叫响应消息是由第三UE发送给所述第二UE的，所述第二呼叫响应消息用于表征所述第三UE确定与所述第一UE之间通过所述第二UE建立呼叫连接，所述第三UE为所述被叫标识指示的UE或者所述被叫标识指示的群组中包含的UE。
结合第一方面的第一种可能的实施方式，在第二种可能的实施方式中，所述第一呼叫响应消息中还包含所述第一UE的标识；
所述第二呼叫响应消息是所述第三UE在接收到所述第二UE广播的第一呼叫响应消息时，根据所述第一呼叫响应消息中包含的所述第一UE的标识，确定与所述第一UE的标识对应的所述第一UE建立呼叫连接，向所述第二UE发送 中继Relay连接请求，与所述第二UE之间建立Relay连接，并向所述第二UE发送的。
结合第一方面，或者结合第一方面的第一种可能的实施方式，或者结合第一方面的第二种可能的实施方式，在第三种可能的实施方式中，所述第一UE在广播呼叫建立消息之前，所述方法还包括：
所述第一UE广播通知消息，其中，所述通知消息中包含所述被叫标识和原因值，所述原因值用于表征所述被叫标识指示的UE或者所述被叫标识指示的群组中包含的UE为所述第一UE的寻呼对象；
所述第一UE接收所述第二UE发送的通知响应消息，其中，所述通知响应消息中包含所述第二UE的标识，所述通知响应消息是由所述第二UE根据所述通知消息中包含的所述原因值和所述被叫标识发送的；
所述呼叫建立消息中还包含发送通知响应消息的所述第二UE的标识。
结合第一方面，或者结合第一方面的第一种可能的实施方式，或者结合第一方面的第二种可能的实施方式，或者结合第一方面的第三种可能的实施方式，在第四种可能的实施方式中，所述第一UE接收第二UE发送的第一呼叫响应消息，包括：
所述第一UE接收所述第二UE发送的200 ok消息，其中，所述200 ok消息中层Layer 2目标地址为所述群组的Layer 2地址。
第二方面，提供了一种呼叫建立方法，包括：
第二用户设备UE接收第一UE广播的呼叫建立消息，其中，所述呼叫建立消息中包含所述第一UE的标识和被叫标识，所述被叫标识用于指示所述第一UE呼叫的群组或者UE；
所述第二UE根据所述呼叫建立消息中包含的被叫标识，确定所述第二UE为所述被叫标识指示的UE或者所述被叫标识指示的群组中包含的UE；
所述第二UE向所述第一UE发送第一呼叫响应消息，其中，所述第一呼叫响应消息中包含所述第二UE的标识。
结合第二方面，在第一种可能的实施方式中，所述第二UE在接收第一UE 广播的呼叫建立消息之前，所述方法还包括：
所述第二UE接收所述第一UE发送的通知消息，其中，所述通知消息中包含被叫标识和原因值，所述原因值用于表征所述被叫标识指示的UE或者所述被叫标识指示的群组中包含的UE为所述第一UE的寻呼对象；
所述第二UE根据接收到的所述通知消息中包含的被叫标识，确定所述第二UE为所述被叫标识指示的UE或者所述第二UE为所述被叫标识指示的群组中包含的UE，以及根据接收到的所述通知消息中包含的原因值确定所述第二UE为所述第一UE的寻呼对象；
所述第二UE向所述第一UE发送通知响应消息，其中，所述通知响应消息中包含所述第二UE的标识。
第三方面，提供了一种呼叫建立方法，包括：
第三用户设备UE接收第二UE广播的第一呼叫响应消息，其中，所述第一呼叫响应消息中包含所述第二UE的标识和第一UE的标识，所述第一UE的标识是由所述第二UE从接收到所述第一UE广播的呼叫建立消息中获得的；
所述第三UE根据接收到的所述第一呼叫响应消息中包含的所述第一UE的标识，确定与所述第一UE的标识对应的所述第一UE建立呼叫连接，并向所述第二UE发送中继Relay连接请求；
所述第三UE与所述第二UE之间建立Relay连接，向所述第二UE发送第二呼叫响应消息，其中，所述第二呼叫响应消息中包含所述第三UE的标识。
结合第三方面，在第一种可能的实施方式中，若所述第三UE接收到大于或者等于两个的所述第二UE广播的第一呼叫响应消息，所述方法还包括：
所述第三UE从接收到的大于或者等于两个的所述第一呼叫响应消息中，选择其中一个所述第一呼叫响应消息；
所述第三UE根据接收到的所述第一呼叫响应消息中包含的所述第一UE的标识，确定与所述第一UE的标识对应的所述第一UE建立呼叫连接，并向所述第二UE发送中继Relay连接请求，包括：
所述第三UE根据选择的所述第一呼叫响应消息中包含的所述第一UE的标 识，确定与所述第一UE的标识对应的所述第一UE建立呼叫连接；并根据选择的所述第一呼叫响应消息中包含的所述第二UE的标识，向所述第二UE的标识对应的所述第二UE发送中继Relay连接请求。
第四方面，提供了一种用户设备，其特征在于，所述用户设备为第一用户设备UE，包括：
信号发射器，用于广播呼叫建立消息，其中，所述呼叫建立消息中包含所述第一UE的标识和被叫标识，所述被叫标识用于指示所述第一UE呼叫的群组或者UE；
信号接收器，用于接收所述第二UE发送的第一呼叫响应消息，其中，所述第一呼叫响应消息中包含所述第二UE的标识，所述第一呼叫响应消息是所述第二UE根据接收到的所述呼叫建立消息中包含的所述被叫标识向所述第一UE发送的；
处理器，用于根据接收到的所述第一呼叫响应消息，与所述第二UE的标识对应的第二UE建立呼叫连接。
结合第四方面，在第一种可能的实施方式中，所述信号接收器，还用于接收所述第二UE发送的第二呼叫响应消息，其中，所述第二呼叫响应消息中包含第三UE的标识，所述第二呼叫响应消息是由所述第三UE发送给所述第二UE的，所述第二呼叫响应消息用于表征所述第三UE确定与所述第一UE之间通过所述第二UE建立呼叫连接，所述第三UE为所述被叫标识指示的UE或者所述被叫标识指示的群组中包含的UE。
结合第四方面的第一种可能的实施方式，在第二种可能的实施方式中，所述第一呼叫响应消息中还包含所述第一UE的标识；
所述第二呼叫响应消息是所述第三UE在接收到所述第二UE广播的第一呼叫响应消息时，根据所述第一呼叫响应消息中包含的所述第一UE的标识，确定与所述第一UE的标识对应的所述第一UE建立呼叫连接，向所述第二UE发送中继Relay连接请求，与所述第二UE之间建立Relay连接，并向所述第二UE发送的。
结合第四方面，或者结合第四方面的第一种可能的实施方式，或者结合第四方面的第二种可能的实施方式，在第三种可能的实施方式中，所述信号发射器，还用于在广播呼叫建立消息之前，广播通知消息，其中，所述通知消息中包含所述被叫标识和原因值，所述原因值用于表征所述被叫标识指示的UE或者所述被叫标识指示的群组中包含的UE为所述第一UE的寻呼对象；
所述信号接收器，还用于接收所述第二UE发送的通知响应消息，其中，所述通知响应消息中包含所述第二UE的标识，所述通知响应消息是由所述第二UE根据所述通知消息中包含的所述原因值和所述被叫标识发送的；
所述呼叫建立消息中还包含发送通知响应消息的所述第二UE的标识。
结合第四方面，或者结合第四方面的第一种可能的实施方式，或者结合第四方面的第二种可能的实施方式，或者结合第四方面的第三种可能的实施方式，在第四种可能的实施方式中，所述信号接收器，具体用于接收所述第二UE发送的200 ok消息，其中，所述200 ok消息中层Layer 2目标地址为所述群组的Layer2地址。
第五方面，提供了一种用户设备，所述用户设备为第二用户设备UE，包括：
信号接收器，用于接收第一UE广播的呼叫建立消息，其中，所述呼叫建立消息中包含所述第一UE的标识和被叫标识，所述被叫标识用于指示所述第一UE呼叫的群组或者UE；
处理器，用于根据所述呼叫建立消息中包含的被叫标识，确定所述第二UE为所述被叫标识指示的UE或者所述被叫标识指示的群组中包含的UE；
信号发射器，用于向所述第一UE发送第一呼叫响应消息，其中，所述第一呼叫响应消息中包含所述第二UE的标识。
结合第五方面，在第一种可能的实施方式中，所述信号接收器，还用于在接收第一UE广播的呼叫建立消息之前，接收所述第一UE发送的通知消息，其中，所述通知消息中包含被叫标识和原因值，所述原因值用于表征所述被叫标识指示的UE或者所述被叫标识指示的群组中包含的UE为所述第一UE的寻呼对象；
所述处理器，还用于根据接收到的所述通知消息中包含的被叫标识，确定所述第二UE为所述被叫标识指示的UE或者所述第二UE为所述被叫标识指示的群组中包含的UE，以及根据接收到的所述通知消息中包含的原因值确定所述第二UE为所述第一UE的寻呼对象；
所述信号发射器，还用于向所述第一UE发送通知响应消息，其中，所述通知响应消息中包含所述第二UE的标识。
第六方面，提供了一种用户设备，所述用户设备为第三用户设备UE，包括：
信号接收器，用于接收第二UE广播的第一呼叫响应消息，其中，所述第一呼叫响应消息中包含所述第二UE的标识和第一UE的标识，所述第一UE的标识是由所述第二UE从接收到所述第一UE广播的呼叫建立消息中获得的；
处理器，用于根据接收到的所述第一呼叫响应消息中包含的所述第一UE的标识，确定与所述第一UE的标识对应的所述第一UE建立呼叫连接；
信号发射器，用于向所述第二UE发送中继Relay连接请求；
所述处理器，还用于与所述第二UE之间建立Relay连接；
所述信号发射器，还用于向所述第二UE发送第二呼叫响应消息，其中，所述第二呼叫响应消息中包含所述第三UE的标识。
结合第六方面，在第一种可能的实施方式中，所述处理器，还用于若所述信号接收器接收到大于或者等于两个的所述第二UE广播的第一呼叫响应消息，从接收到的大于或者等于两个的所述第一呼叫响应消息中，选择其中一个所述第一呼叫响应消息；
所述处理器根据接收到的所述第一呼叫响应消息中包含的所述第一UE的标识，确定与所述第一UE的标识对应的所述第一UE建立呼叫连接，并向所述第二UE发送中继Relay连接请求，包括：
根据选择的所述第一呼叫响应消息中包含的所述第一UE的标识，确定与所述第一UE的标识对应的所述第一UE建立呼叫连接；并根据选择的所述第一呼叫响应消息中包含的所述第二UE的标识，向所述第二UE的标识对应的所述第二UE发送中继Relay连接请求。
第七方面，提供了一种呼叫建立系统，所述呼叫建立系统包含第一用户设备UE和第二UE，其中：
第一UE，用于广播呼叫建立消息，所述呼叫建立消息中包含所述第一UE的标识和被叫标识，所述被叫标识用于指示所述第一UE呼叫的群组或者UE；接收所述第二UE发送的第一呼叫响应消息，所述第一呼叫响应消息中包含所述第二UE的标识；根据接收到的所述第一呼叫响应消息，与所述第二UE的标识对应的第二UE建立呼叫连接；
第二UE，用于接收所述第一UE广播的呼叫建立消息，根据所述呼叫建立消息中包含的被叫的标识，确定所述第二UE为所述被叫标识指示的UE或者所述被叫标识指示的群组中包含的UE，向所述第一UE发送第一呼叫响应消息。
结合第七方面，在第一种可能的实施方式中，所述呼叫建立系统中还包括第三UE，其中：
所述第二UE，具体用于在确定所述第二UE为所述被叫标识指示的UE或者所述被叫标识对应的群组中包含的UE时，广播第一呼叫响应消息；
所述第三UE，用于接收所述第二UE广播的第一呼叫响应消息，所述第一呼叫响应消息中包含所述第二UE的标识和所述第一UE的标识，所述第一UE的标识是由所述第二UE从接收到所述第一UE广播的呼叫建立消息中获得的；根据接收到的所述第一呼叫响应消息中包含的所述第一UE的标识，确定与所述第一UE的标识对应的所述第一UE建立呼叫连接，并向所述第二UE发送中继Relay连接请求；
所述第二UE，还用于接收所述第三UE发送的Relay连接请求，并向所述第三UE发送连接响应消息；
所述第三UE，还用于根据接收到的所述连接响应消息，与所述第二UE之间建立Relay连接，并向所述第二UE发送第二呼叫响应消息，其中，所述第二呼叫响应消息中包含所述第三UE的标识。
结合第七方面，或者结合第七方面的第一种可能的实施方式，在第三种可能的实施方式中，所述第一UE，还用于在广播呼叫建立消息之前，广播通知消 息，其中，所述通知消息中包含被叫标识和原因值，所述原因值用于表征所述被叫标识指示的UE或者所述被叫标识指示的群组中包含的UE为所述第一UE的寻呼对象；
所述第二UE，还用于接收所述第一UE广播的通知消息，根据接收到的所述通知消息中包含的被叫标识，确定所述第二UE为所述被叫标识指示的UE或者所述第二UE为所述被叫标识指示的群组中包含的UE，以及根据接收到的所述通知消息中包含的原因值确定所述第二UE为所述第一UE的寻呼对象，向所述第一UE发送通知响应消息，其中，所述通知响应消息中包含所述第二UE的标识；
所述第一UE，还用于接收所述第二UE发送的通知响应消息。
有益效果：
本发明实施例通过第一UE广播呼叫建立消息，所述呼叫建立消息中包含所述第一UE的标识和被叫标识，所述被叫标识用于指示所述第一UE呼叫的群组或者UE；接收第二UE发送的第一呼叫响应消息，所述第一呼叫响应消息中包含所述第二UE的标识，所述第一呼叫响应消息是所述第二UE根据接收到的所述呼叫建立消息中包含的所述被叫标识向所述第一UE发送的；根据接收到的所述第一呼叫响应消息，与所述第二UE的标识对应的第二UE建立呼叫连接，这样任意的UE在脱网状态下广播呼叫建立消息，通过点对点方式与发送呼叫响应的其他UE建立呼叫连接，有效地改善DMO场景中固定的呼叫建立方式，增加在脱网情况下群组呼叫建立的灵活性。
附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简要介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域的普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1为本发明提供的一种呼叫建立方法的流程示意图；
图2为本发明提供的一种呼叫建立方法的流程示意图；
图3为本发明提供的一种呼叫建立方法的流程示意图；
图4为本发明提供的一种呼叫建立方法的流程示意图；
图5为本发明提供的一种用户设备的结构示意图；
图6为本发明提供的一种用户设备的结构示意图；
图7为本发明提供的一种用户设备的结构示意图；
图8为本发明提供的一种用户设备的结构示意图；
图9为本发明提供的一种呼叫建立系统的结构示意图。
具体实施方式
为了实现本发明的目的，本发明实施例提供了一种呼叫建立方法、系统和用户设备，通过第一UE广播呼叫建立消息，所述呼叫建立消息中包含所述第一UE的标识和被叫标识，所述被叫标识用于指示所述第一UE呼叫的群组或者UE；接收第二UE发送的第一呼叫响应消息，所述第一呼叫响应消息中包含所述第二UE的标识，所述第一呼叫响应消息是所述第二UE根据接收到的所述呼叫建立消息中包含的所述被叫标识向所述第一UE发送的；根据接收到的所述第一呼叫响应消息，与所述第二UE的标识对应的第二UE建立呼叫连接，这样任意的UE在脱网状态下广播呼叫建立消息，通过点对点方式与发送呼叫响应的其他UE建立呼叫连接，有效地改善DMO场景中固定的呼叫建立方式，增加在脱网情况下群组呼叫建立的灵活性。
需要说明的是，本发明实施例中所涉及到的被叫标识可以是指被叫UE的标识，也可以是指被叫UE所在群组的标识。对于群组的标识可以是指群组的身份标识(英文：Identity)，也可以是指群组的网际协议(英文：Internet Protocol；缩写：IP)地址，还可以是能够标识群组的其他信息，这里不做限定。
下面结合说明书附图对本发明各个实施例进行详细描述。显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其它实 施例，都属于本发明保护的范围。
图1为本发明实施例提供的一种呼叫建立方法的流程示意图。所述方法可以如下所述。
步骤101：第一UE广播呼叫建立消息。
其中，所述呼叫建立消息中包含所述第一UE的标识和被叫标识，所述被叫标识用于指示所述第一UE呼叫的群组或者UE。
可选地，若第一UE呼叫的对象是群组，那么该呼叫建立消息中包含的被叫标识为群组的标识；若第一UE呼叫的对象是UE，那么该呼叫建立消息中包含的被叫标识为UE的标识。
需要说明的是，若被叫标识为UE的标识，可以是一个UE的标识，也可以是多个UE的标识，这里对于UE的标识的个数不做限定。
在步骤101中，作为MCPTT的呼叫发起者，第一UE可以是一个群组中的任意一个UE，具备主动发起群组呼叫的功能。
首先，第一UE确定发起群组呼叫的目标群组，那么将确定的目标群组的群组标识作为被叫标识携带在呼叫建立消息中通过广播方式发送。
或者，第一UE确定呼叫一个群组中的至少一个其他UE，那么将确定呼叫的其他UE的标识作为被叫标识携带在呼叫建立消息中通过广播方式发送。
具体地，第一UE在确定发起呼叫时，将呼叫请求、第一UE的标识、被叫标识和承载该呼叫请求的协议消息头封装成应用层呼叫建立消息，并通过广播方式发送该呼叫建立消息。
可选地，第一UE在确定发起呼叫时，广播会话初始化协议(英文：Session Initiation Protocol；缩写：SIP)信令，其中，所述SIP信令用于指示所述第一UE发起呼叫建立请求，所述SIP信令中包含所述第一UE的标识和被叫标识。
需要说明的是，呼叫建立消息的具体实现方式还可以通过对第三代合作伙伴计划(英文：3rd Generation Partnership Project；缩写：3GPP)rel12定义的1：m group(群组)通信的方式加以扩展实现，即采用1：m通信方式携带SIP信令的方式实现。
步骤102：所述第一UE接收第二UE发送的第一呼叫响应消息。
其中，所述第一呼叫响应消息中包含所述第二UE的标识，所述第一呼叫响应消息是所述第二UE根据接收到的所述呼叫建立消息中包含的所述被叫标识向所述第一UE发送的。
在步骤102中，在第一UE附近存在至少一个第二UE，该第二UE在接收到第一UE广播的呼叫建立消息时，解析该呼叫建立消息，得到呼叫请求信令和被叫标识。
该第二UE根据得到的被叫标识，确定自己是否是第一UE的呼叫对象，若是，则根据该呼叫请求信令，确定是否接收该呼叫请求，在确定接受本次呼叫时，向所述第一UE发送第一呼叫响应消息。
其中，该第一呼叫响应消息的形式可以是200 ok消息，该200 ok消息中Layer 2目标地址为所述群组的layer2标识，也可以是第一UE的layer 2标识。
可选地，该第一呼叫响应消息还可以承载在1：m communication(通信)的群组广播消息中。其中，该1：m communication的群组广播消息的Layer 2目标地址为该群组的layer 2地址。这样可以使没有接收到第一UE广播的呼叫建立请求的其他UE，在获取该第一呼叫响应消息时，知道第一UE发起呼叫，并确定是否接受该呼叫。
步骤103：所述第一UE根据接收到的所述第一呼叫响应消息，与所述第二UE的标识对应的第二UE建立呼叫连接。
在步骤103中，当所述第一UE接收到多个第二UE发送的第一呼叫响应消息时，所述第一UE根据接收到的每一个第一呼叫响应消息，确定响应本次呼叫的多个第二UE，在确定响应本次呼叫的多个第二UE达到设定的呼叫建立条件时，建立与每一个第二UE之间的呼叫连接。
例如：设定的呼叫建立条件为响应本次呼叫的UE的数量值，那么所述第一UE根据接收到的每一个第一呼叫响应消息，确定响应本次呼叫的第二UE的数量，在确定响应本次呼叫的第二UE的数量达到设定的呼叫建立要求的UE的数量值时，建立与每一个第二UE之间的呼叫连接。
具体地，所述第一UE在确定建立与每一个第二UE之间的呼叫连接时，向每一个第二UE发送应用层的确认消息。
其中，所述确定消息可以是确认(英文：Acknowledgement；缩写：ACK)消息，也可以是其他消息。
所述第一UE向每一个第二UE发送应用层的确认消息的方式可以采用点到点的发送方式。
可选地，所述第一UE在建立与每一个第二UE之间的呼叫连接之后，在执行群组会话的过程中，还可以向每一个第二UE发送会话状态消息。其中，所述会话状态消息中包含参与会话的每一个第二UE的标识，这样使得参与会话的每一个第二UE能够确定由哪些UE备参与会话，哪些UE退出会话。
需要说明的是，该会话状态消息可以是SIP Information/Notify消息。
第一UE发送会话状态消息的方式可以是广播方式，也可以是点到点发送方式或点到多点方式，这里不做限定。
此时，第一用户设备作为MCPTT的控制角色，可以执行话权控制(英文：Floor Control)，即接收每一个第二UE的会话请求，确定每一个第二UE进行会话的顺序，并将当前发言的第二UE发出的语音或者媒体通过点对点或者点对多点的方式发送给其他第二UE。
例如：一个群组中包含UE1、UE2、UE3和UE4，UE1作为呼叫发起者，接收到UE2所发出的语音或者媒体数据，并将接收到的UE2所发出的语音或者媒体数据，通过点对点或者点对多点的方式分别发送给UE3和UE4。
通过本发明实施例所述的方案，第一UE广播呼叫建立消息，所述呼叫建立消息中包含所述第一UE的标识和被叫标识，所述被叫标识用于指示所述第一UE呼叫的群组或者UE；接收第二UE发送的第一呼叫响应消息，所述第一呼叫响应消息中包含所述第二UE的标识，所述第一呼叫响应消息是所述第二UE根据接收到的所述呼叫建立消息中包含的所述被叫标识向所述第一UE发送的；根据接收到的所述第一呼叫响应消息，与所述第二UE的标识对应的第二UE建立呼叫连接，这样任意的UE在脱网状态下广播呼叫建立消息，通过点对点方式 与发送呼叫响应的其他UE建立呼叫连接，有效地改善DMO场景中固定的呼叫建立方式，增加在脱网情况下群组呼叫建立的灵活性。
图2为本发明实施例提供的一种呼叫建立方法结构示意图。本发明实施例所述的方案在图1所述的实施例的基础之上，当第三UE接收不到第一UE广播的呼叫建立消息时，第三UE可以通过自由选择能够接收到第一UE广播的呼叫建立消息的第二UE作为中继，实现第三UE与第一UE之间的中继直通。所述方法可以如下所述。
步骤201：第一UE广播呼叫建立消息。
所述呼叫建立消息中包含所述第一UE的标识和被叫标识，所述被叫标识用于指示所述第一UE呼叫的群组或者UE。
本步骤的具体实现方式与上述步骤101的具体实现方式相同，这里不做具体描述。
步骤202：第二UE接收第一UE广播的呼叫建立消息，并在确定接受本次呼叫时，广播第一呼叫响应消息。
其中，所述第一呼叫响应消息承载在1：m communication(通信)的群组广播消息中，该1：m communication的群组广播消息的Layer 2目标地址为该群组的Layer 2地址。
在步骤202中，所述第二UE根据所述呼叫建立消息中包含的被叫标识，确定所述第二UE为所述被叫标识指示的UE或者所述被叫标识指示的群组中包含的UE；并在确定接受本次呼叫时，广播第一呼叫响应消息。
具体地，所述第一呼叫响应消息中所述第二UE的标识和第一UE的标识。
所述第一UE的标识是由所述第二UE从接收到所述第一UE广播的呼叫建立消息中获得的。
步骤203：所述第一UE接收所述第二UE广播的第一呼叫响应消息。
步骤204：第三UE接收所述第二UE广播的第一呼叫响应消息。
在步骤204中，由于第三UE为所述被叫标识指示的UE或者所述被叫标识指示的群组中包含的UE，且无法接收到第一UE广播的呼叫建立消息，但是能 够接收到第二UE广播的第一呼叫响应消息。
这样，第三UE在接收到第二UE广播的第一呼叫响应消息时，解析该第一呼叫响应消息，得到第一UE的标识，确定呼叫发起者。
第三UE根据接收到的所述第一呼叫响应消息中包含的所述第一UE的标识，确定是否与所述第一UE的标识对应的所述第一UE建立呼叫连接。
可选地，由于第二UE采用广播方式发送第一呼叫响应消息，若多个第二UE都采用广播方式发送第一呼叫响应消息，那么第三UE将接收到的大于或者等于两个第一呼叫响应消息，此时，第三UE从接收到的大于或者等于两个的所述第一呼叫响应消息中，选择其中一个所述第一呼叫响应消息。
这里第三UE选择第一呼叫响应消息的方式可以依据接收到的第一呼叫响应消息的信号强度或者信号质量，以选择信号强度最大或者信号质量最好的第一呼叫响应消息为优先方式，这里对于如何选择不做限定。
具体地，所述第三UE根据选择的所述第一呼叫响应消息中包含的所述第一UE的标识，确定是否与所述第一UE的标识对应的所述第一UE建立呼叫连接。
需要说明的是，本发明实施例中所描述的第三UE不限于一个UE，而是一类UE，该类UE具备为第一UE发送的呼叫建立消息中包含的被叫标识指示的UE，但是无法直接接收到第一UE发送的呼叫建立消息。
步骤205：所述第三UE在确定与所述第一UE的标识对应的所述第一UE建立呼叫连接时，向所述第二UE发送Relay连接请求。
其中，所述Relay连接请求中包含所述第三UE的标识。
在步骤205中，若第三UE在步骤204中执行选择一个第一呼叫响应消息的操作，那么在步骤205中，所述第三UE在确定与所述第一UE的标识对应的所述第一UE建立呼叫连接时，根据选择的所述第一呼叫响应消息中包含的所述第二UE的标识，向所述第二UE的标识对应的所述第二UE发送Relay连接请求。
步骤206：所述第三UE与所述第二UE之间建立Relay连接，向所述第二UE发送第二呼叫响应消息。
其中，所述第二呼叫响应消息中包含所述第三UE的标识。
可选的，在步骤206之前，所述第二UE将接收到的第一UE广播的呼叫建立消息转发给第三UE。
步骤207：所述第二UE接收所述第三UE发送第二呼叫响应消息，并将所述第二呼叫响应消息转发给所述第一UE。
步骤208：所述第一UE接收所述第二UE发送的第二呼叫响应消息。
其中，所述第二呼叫响应消息中包含第三UE的标识，所述第二呼叫响应消息是由第三UE发送给所述第二UE的，所述第二呼叫响应消息用于表征所述第三UE确定与所述第一UE之间通过所述第二UE建立呼叫连接，所述第三UE为所述被叫标识指示的UE或者所述被叫标识指示的群组中包含的UE。
步骤209：所述第一UE根据接收到的所述第二呼叫响应消息，通过所述第二UE与所述第三UE之间建立呼叫连接，以及根据接收到的所述第一呼叫响应消息，与所述第二UE之间建立呼叫连接。
图3为本发明实施例提供的一种呼叫建立方法的流程示意图。本发明实施例所述呼叫建立方法与图2中所述的呼叫建立方法相似，但是执行流程有所不同。所述方法可以如下所述。
步骤301：第一UE广播呼叫建立消息。
所述呼叫建立消息中包含所述第一UE的标识和被叫标识，所述被叫标识用于指示所述第一UE呼叫的群组或者UE。
本步骤的具体实现方式与上述步骤101的具体实现方式相同，这里不做具体描述。
步骤302：第二UE接收第一UE广播的呼叫建立消息，并在确定接受本次呼叫时，向所述第一UE发送第一呼叫响应消息。
在步骤302中，所述第二UE根据所述呼叫建立消息中包含的被叫标识，确定所述第二UE为所述被叫标识指示的UE或者所述被叫标识指示的群组中包含的UE；并在确定接受本次呼叫时，向所述第一UE发送第一呼叫响应消息。
具体地，所述第一呼叫响应消息中所述第二UE的标识。
步骤303：所述第一UE接收所述第二UE发送的第一呼叫响应消息。
步骤304：所述第二UE根据接收到的所述呼叫建立消息中包含的被叫标识，确定第三UE为所述被叫标识指示的UE或者所述被叫标识指示的群组中包含的UE，向所述第三UE转发所述第一UE广播的呼叫建立消息。
在步骤304中，所述第二UE根据接收到的所述呼叫建立消息中包含的被叫标识，确定第三UE为所述被叫标识指示的UE或者所述被叫标识指示的群组中包含的UE的方式包括但不限于：
所述第二UE通过发现方式发现第三UE，并确定发现的第三UE为所述被叫标识指示的UE或者所述被叫标识指示的群组中包含的UE；
或者，所述第二UE通过点对点方式确定第三UE尚未接收到第一UE广播的呼叫建立消息，且确定第三UE为所述被叫标识指示的UE或者所述被叫标识指示的群组中包含的UE。
步骤305：第三UE接收所述第二UE转发的呼叫建立消息。
在步骤305中，由于第三UE为所述被叫标识指示的UE或者所述被叫标识指示的群组中包含的UE，且无法接收到第一UE广播的呼叫建立消息，但是可以通过第二UE接收到第一UE广播的呼叫建立消息。
这样，第三UE根据接收到的所述呼叫建立消息中包含的所述第一UE的标识，确定是否与所述第一UE的标识对应的所述第一UE建立呼叫连接。
需要说明的是，本发明实施例中所描述的第三UE不限于一个UE，而是一类UE，该类UE具备为第一UE发送的呼叫建立消息中包含的被叫标识指示的UE，但是无法直接接收到第一UE发送的呼叫建立消息。
步骤306：所述第三UE在确定与所述第一UE的标识对应的所述第一UE建立呼叫连接时，向所述第二UE发送Relay连接请求。
其中，所述Relay连接请求中包含所述第三UE的标识。
步骤307：所述第三UE与所述第二UE之间建立Relay连接，向所述第二UE发送第二呼叫响应消息。
其中，所述第二呼叫响应消息中包含所述第三UE的标识。
步骤308：所述第二UE接收所述第三UE发送第二呼叫响应消息，并将所 述第二呼叫响应消息转发给所述第一UE。
步骤309：所述第一UE接收所述第二UE发送的第二呼叫响应消息。
其中，所述第二呼叫响应消息中包含第三UE的标识，所述第二呼叫响应消息是由第三UE发送给所述第二UE的，所述第二呼叫响应消息用于表征所述第三UE确定与所述第一UE之间通过所述第二UE建立呼叫连接，所述第三UE为所述被叫标识指示的UE或者所述被叫标识指示的群组中包含的UE。
步骤310：所述第一UE根据接收到的所述第二呼叫响应消息，通过所述第二UE与所述第三UE之间建立呼叫连接，以及根据接收到的所述第一呼叫响应消息，与所述第二UE之间建立呼叫连接。
需要说明的是，图2和图3中所示的呼叫建立方法，第二UE作为第一UE与第三UE之间呼叫建立的中继，本发明实施例中对于中继可以是一级中继，也可以是多级中继，这里不做限定。例如：一条呼叫连接中包括：UE1、UE2和UE3，那么UE2作为UE1与UE3之间呼叫建立的中继；一条呼叫连接中包含：UE1、UE2、UE3和UE4，那么UE2作为UE1与UE3之间呼叫建立的中继，UE3作为UE2与UE4之间呼叫建立的中继，UE2和UE3作为UE1与UE4之间呼叫建立的中继。
通过本发明实施例所述的方案，任意UE在脱网状态下广播呼叫建立消息，通过点对点方式与发送呼叫响应的其他UE建立呼叫连接；若存在被呼叫对象无法接收到主叫的呼叫建立消息时，该被叫对象可以从自身周围选择能够接收到主叫的呼叫建立消息的被叫对象作为与主叫建立呼叫连接的中继，实现与主叫之间建立呼叫连接，有效地改善DMO场景中固定的呼叫建立方式，增加在脱网情况下群组呼叫建立的灵活性。
图4为本发明实施例提供的一种呼叫建立方法的流程示意图。所述方法可以如下所述。
步骤401：第一UE广播通知消息。
其中，所述通知消息中包含所述被叫标识和原因值，所述原因值用于表征所述被叫标识指示的UE或者所述被叫标识指示的群组中包含的UE为所述第一 UE的寻呼对象。
需要说明的是，所述通知消息可以采用群组成员发现(英文：group member discovery)方式发送，也可以采用寻呼(英文：Paging)方式发送，这里不做限定。
在步骤401中，第一UE在发起呼叫建立之前，通过通知消息寻找被呼叫对象。
例如：通过通知群组标识(英文：announcing group ID)的方式，确定可能响应呼叫的群组成员。
需要说明的是，所述通知消息中可以包含群组标识，也可以包含被呼叫的UE的标识，这里不做限定。
该通知信息还可以包含第一UE的标识，例如，第一UE的ID和第一UE的地址信息，例如：IP地址等。
通知消息中包含的原因值，使得接收到第一UE广播的通知消息时，确定第一UE发送通知消息的目的，这样可以根据接收到的通知消息中包含的被叫标识作出响应。
步骤402：第二UE接收到所述通知消息，并在确定响应寻呼时，向所述第一UE发送连接请求，与所述第一UE建立直连接(例如：设备与设备(英文：Device to Device；缩写：D2D)连接)。
在步骤402中，第二UE不限于一个UE，而是一类UE，即能够直接与所述第一UE建立呼叫连接的UE。
可选地，第二UE确定响应寻呼的方式包括：
所述第二UE根据接收到的所述通知消息中包含的被叫标识，确定所述第二UE为所述被叫标识指示的UE或者所述第二UE为所述被叫标识指示的群组中包含的UE，以及根据接收到的所述通知消息中包含的原因值确定所述第二UE为所述第一UE的寻呼对象，向所述第一UE发送通知响应消息。
其中，所述通知响应消息中包含所述第二UE的标识。
所述第一UE接收所述第二用户设备发送的通知响应消息。
所述403：第二UE向所述第一UE发送第一注册请求。
其中，所述第一注册请求中包含所述第二UE的标识。
在步骤403中，所述第二UE发送第一注册请求的方式可以采用广播方式或者rel121：m群组广播模式。
可选地，所述第一注册请求中包含所述第一UE的标识。
步骤404：第三UE接收所述第二UE发送的第一注册请求，根据所述第一注册请求中包含的所述第一UE的标识，确定与所述第一UE的标识对应的第一UE建立呼叫连接，并向所述第二UE发送Relay连接请求。
其中，所述Relay连接请求中包含所述第三用户设备标识。
步骤405：所述第三UE与所述第二UE之间建立Relay连接，并向所述第二UE发送第二注册请求。
其中，所述第二注册请求中包含第三UE的标识。
需要说明的是，本发明实施例中的步骤404～步骤405不是必选步骤，而是优选步骤。本发明实施例中步骤404和步骤405的目的是确定所述第二UE为第一UE与第三UE之间呼叫建立的中继，为了达到这一目的，除了使用本发明实施例中步骤404和步骤405的方式之外，还可以采用图3中步骤304～步骤307中所述的实施方式，区别在于交互的消息不同。
步骤406：所述第一UE接收所述第二UE发送的所述第一注册请求和所述第二注册请求。
步骤407：第一UE向注册的第二UE广播呼叫建立消息。
其中，所述呼叫建立消息中包含所述第一UE的标识和被叫标识。
在步骤407中，第一UE向注册的第二UE发送呼叫建立消息的方式可以是通过点到点的方式，也可以是通过广播方式，这里不做限定。
第一UE广播的呼叫建立消息可以是会话邀请(英文：SIP invite)消息，其中，该SIP invite消息中可以包含被呼叫的UE的标识，例如：第二UE的标识、第三UE的标识。
这里需要说明的是，第二UE在接收到SIP invite消息时，确定会话邀请第 三UE，此时将该会话邀请转发给第三UE。
步骤408：第一UE接收第二UE发送的第一呼叫响应消息和第二呼叫响应消息，并建立与所述第二UE、所述第三UE之间的呼叫连接。
其中，所述第二呼叫响应消息是由第三UE发送给第二UE的。
步骤409：第一UE向所述第二UE发送确认消息。
图5所示，为本发明实施例提供的一种用户设备的结构示意图。所述用户设备可以采用通用计算机结构实现。所述用户设备包括：信号发射器51、处理器52和信号接收器53。信号发射器51、处理器52和信号接收器53可以通过总线进行连接。
由于本发明实施例的用户设备角色不同，所使用的功能不同。在本发明实施例中用户设备的功能可以大致分为三类：第一类是主动发起呼叫的第一UE；第二类是可以与第一UE直接建立呼叫的第二UE；第三类是无法直接与第一UE建立呼叫，但可以选择第二UE作为中继实现与第一UE之间建立呼叫。
具体地，若用户设备为第一UE，则所述用户设备包括：
信号发射器51，用于广播呼叫建立消息，其中，所述呼叫建立消息中包含所述第一UE的标识和被叫标识，所述被叫标识用于指示所述第一UE呼叫的群组或者UE；
信号接收器53，用于接收所述第二UE发送的第一呼叫响应消息，其中，所述第一呼叫响应消息中包含所述第二UE的标识，所述第一呼叫响应消息是所述第二UE根据接收到的所述呼叫建立消息中包含的所述被叫标识向所述第一UE发送的；
处理器52，用于根据接收到的所述第一呼叫响应消息，与所述第二UE的标识对应的第二UE建立呼叫连接。
可选地，所述信号接收器53，还用于接收所述第二UE发送的第二呼叫响应消息，其中，所述第二呼叫响应消息中包含第三UE的标识，所述第二呼叫响应消息是由所述第三UE发送给所述第二UE的，所述第二呼叫响应消息用于表征所述第三UE确定与所述第一UE之间通过所述第二UE建立呼叫连接，所述 第三UE为所述被叫标识指示的UE或者所述被叫标识指示的群组中包含的UE。
具体地，所述第一呼叫响应消息中还包含所述第一UE的标识；
所述第二呼叫响应消息是所述第三UE在接收到所述第二UE广播的第一呼叫响应消息时，根据所述第一呼叫响应消息中包含的所述第一UE的标识，确定与所述第一UE的标识对应的所述第一UE建立呼叫连接，向所述第二UE发送中继Relay连接请求，与所述第二UE之间建立Relay连接，并向所述第二UE发送的。
可选地，所述信号发射器51，还用于在广播呼叫建立消息之前，广播通知消息，其中，所述通知消息中包含所述被叫标识和原因值，所述原因值用于表征所述被叫标识指示的UE或者所述被叫标识指示的群组中包含的UE为所述第一UE的寻呼对象；
所述信号接收器53，还用于接收所述第二UE发送的通知响应消息，其中，所述通知响应消息中包含所述第二UE的标识，所述通知响应消息是由所述第二UE根据所述通知消息中包含的所述原因值和所述被叫标识发送的；
所述呼叫建立消息中还包含发送通知响应消息的所述第二UE的标识。
具体地，所述信号接收器53，具体用于接收所述第二UE发送的200 ok消息，其中，所述200 ok消息中层Layer 2目标地址为所述群组的Layer 2地址。
具体地，若用户设备为第二UE，则所述用户设备包括：
信号接收器53，用于接收第一UE广播的呼叫建立消息，其中，所述呼叫建立消息中包含所述第一UE的标识和被叫标识，所述被叫标识用于指示所述第一UE呼叫的群组或者UE；
处理器52，用于根据所述呼叫建立消息中包含的被叫标识，确定所述第二UE为所述被叫标识指示的UE或者所述被叫标识指示的群组中包含的UE；
信号发射器51，用于向所述第一UE发送第一呼叫响应消息，其中，所述第一呼叫响应消息中包含所述第二UE的标识。
可选地，所述信号接收器53，还用于在接收第一UE广播的呼叫建立消息之前，接收所述第一UE发送的通知消息，其中，所述通知消息中包含被叫标识 和原因值，所述原因值用于表征所述被叫标识指示的UE或者所述被叫标识指示的群组中包含的UE为所述第一UE的寻呼对象；
所述处理器52，还用于根据接收到的所述通知消息中包含的被叫标识，确定所述第二UE为所述被叫标识指示的UE或者所述第二UE为所述被叫标识指示的群组中包含的UE，以及根据接收到的所述通知消息中包含的原因值确定所述第二UE为所述第一UE的寻呼对象；
所述信号发射器51，还用于向所述第一UE发送通知响应消息，其中，所述通知响应消息中包含所述第二UE的标识。
具体地，若用户设备为第三UE，则所述用户设备包括：
信号接收器53，用于接收第二UE广播的第一呼叫响应消息，其中，所述第一呼叫响应消息中包含所述第二UE的标识和第一UE的标识，所述第一UE的标识是由所述第二UE从接收到所述第一UE广播的呼叫建立消息中获得的；
处理器52，用于根据接收到的所述第一呼叫响应消息中包含的所述第一UE的标识，确定与所述第一UE的标识对应的所述第一UE建立呼叫连接；
信号发射器51，用于向所述第二UE发送中继Relay连接请求；
所述处理器52，还用于与所述第二UE之间建立Relay连接；
所述信号发射器51，还用于向所述第二UE发送第二呼叫响应消息，其中，所述第二呼叫响应消息中包含所述第三UE的标识。
可选地，所述处理器52，还用于若所述信号接收器接收到大于或者等于两个的所述第二UE广播的第一呼叫响应消息，从接收到的大于或者等于两个的所述第一呼叫响应消息中，选择其中一个所述第一呼叫响应消息；
所述处理器52根据接收到的所述第一呼叫响应消息中包含的所述第一UE的标识，确定与所述第一UE的标识对应的所述第一UE建立呼叫连接，并向所述第二UE发送中继Relay连接请求，包括：
根据选择的所述第一呼叫响应消息中包含的所述第一UE的标识，确定与所述第一UE的标识对应的所述第一UE建立呼叫连接；并根据选择的所述第一呼叫响应消息中包含的所述第二UE的标识，向所述第二UE的标识对应的所述第 二UE发送中继Relay连接请求。
其中，处理器52可以是一个通用中央处理器(CPU)，微处理器，特定应用集成电路(application-specific integrated circuit，ASIC)，或一个或多个用于控制本发明方案程序执行的集成电路。
需要说明的是，本发明实施例中所述的用户设备可以通过硬件方式实现，也可以通过软件方式实现，这里不做限定。
本发明实施例所描述的用户设备的功能，在用户设备作为不同角色时选择对应角色的功能，并不是在同一时间所有的功能都使用。
图6为本发明实施例提供的一种用户设备的结构示意图。所述用户设备为本发明实施例中所描述的第一UE，包括：广播单元61、接收单元62和呼叫建立单元63，其中：
广播单元61，用于广播呼叫建立消息，其中，所述呼叫建立消息中包含所述第一UE的标识和被叫标识，所述被叫标识用于指示所述第一UE呼叫的群组或者UE；
接收单元62，用于接收所述第二UE发送的第一呼叫响应消息，其中，所述第一呼叫响应消息中包含所述第二UE的标识，所述第一呼叫响应消息是所述第二UE根据接收到所述广播单元61广播的所述呼叫建立消息中包含的所述被叫标识向所述第一UE发送的；
呼叫建立单元63，用于根据所述接收单元62接收到的所述第一呼叫响应消息，与所述第二UE的标识对应的第二UE建立呼叫连接。
可选地，所述接收单元62，还用于接收所述第二UE发送的第二呼叫响应消息，其中，所述第二呼叫响应消息中包含第三UE的标识，所述第二呼叫响应消息是由所述第三UE发送给所述第二UE的，所述第二呼叫响应消息用于表征所述第三UE确定与所述第一UE之间通过所述第二UE建立呼叫连接，所述第三UE为所述被叫标识指示的UE或者所述被叫标识指示的群组中包含的UE。
可选地，所述第一呼叫响应消息中还包含所述第一UE的标识；
所述第二呼叫响应消息是所述第三UE在接收到所述第二UE广播的第一呼 叫响应消息时，根据所述第一呼叫响应消息中包含的所述第一UE的标识，确定与所述第一UE的标识对应的所述第一UE建立呼叫连接，向所述第二UE发送中继Relay连接请求，与所述第二UE之间建立Relay连接，并向所述第二UE发送的。
可选地，所述广播单元61，还用于在广播呼叫建立消息之前，广播通知消息，其中，所述通知消息中包含所述被叫标识和原因值，所述原因值用于表征所述被叫标识指示的UE或者所述被叫标识指示的群组中包含的UE为所述第一UE的寻呼对象；
所述接收单元62，还用于接收所述第二UE发送的通知响应消息，其中，所述通知响应消息中包含所述第二UE的标识，所述通知响应消息是由所述第二UE根据所述通知消息中包含的所述原因值和所述被叫标识发送的；
所述呼叫建立消息中还包含发送通知响应消息的所述第二UE的标识。
具体地，所述接收单元62，具体用于接收所述第二UE发送的200 ok消息，其中，所述200 ok消息中层Layer 2目标地址为所述群组的Layer 2地址。
图7为本发明实施例提供的一种用户设备的结构示意图。所述用户设备为第二用户设备UE，包括：接收单元71、确定单元72和发送单元73，其中：
接收单元71，用于接收第一UE广播的呼叫建立消息，其中，所述呼叫建立消息中包含所述第一UE的标识和被叫标识，所述被叫标识用于指示所述第一UE呼叫的群组或者UE；
确定单元72，用于根据所述接收单元71接收到的所述呼叫建立消息中包含的被叫标识，确定所述第二UE为所述被叫标识指示的UE或者所述被叫标识指示的群组中包含的UE；
发送单元73，用于向所述第一UE发送第一呼叫响应消息，其中，所述第一呼叫响应消息中包含所述第二UE的标识。
可选地，接收单元71，还用于在接收第一UE广播的呼叫建立消息之前，接收所述第一UE发送的通知消息，其中，所述通知消息中包含被叫标识和原因值，所述原因值用于表征所述被叫标识指示的UE或者所述被叫标识指示的群组 中包含的UE为所述第一UE的寻呼对象；
所述确定单元72，还用于根据接收到的所述通知消息中包含的被叫标识，确定所述第二UE为所述被叫标识指示的UE或者所述第二UE为所述被叫标识指示的群组中包含的UE，以及根据接收到的所述通知消息中包含的原因值确定所述第二UE为所述第一UE的寻呼对象；
所述发送单元73，还用于向所述第一UE发送通知响应消息，其中，所述通知响应消息中包含所述第二UE的标识。
图8为本发明实施例提供的一种用户设备的结构示意图。所述用户设备为第三用户设备UE，包括：接收单元81、确定单元82、发送单元83和建立连接单元84，其中：
接收单元81，用于接收第二UE广播的第一呼叫响应消息，其中，所述第一呼叫响应消息中包含所述第二UE的标识和第一UE的标识，所述第一UE的标识是由所述第二UE从接收到所述第一UE广播的呼叫建立消息中获得的；
确定单元82，用于根据接收到的所述第一呼叫响应消息中包含的所述第一UE的标识，确定与所述第一UE的标识对应的所述第一UE建立呼叫连接；
发送单元83，用于向所述第二UE发送中继Relay连接请求；
建立连接单元84，用于与所述第二UE之间建立Relay连接；
所述发送单元83，还用于向所述第二UE发送第二呼叫响应消息，其中，所述第二呼叫响应消息中包含所述第三UE的标识。
可选地，所述用户设备还包括：选择单元85，其中：
所述选择单元85，还用于若所述信号接收器接收到大于或者等于两个的所述第二UE广播的第一呼叫响应消息，从接收到的大于或者等于两个的所述第一呼叫响应消息中，选择其中一个所述第一呼叫响应消息；
所述确定单元82，具体用于根据选择的所述第一呼叫响应消息中包含的所述第一UE的标识，确定与所述第一UE的标识对应的所述第一UE建立呼叫连接；
所述发送单元83，具体用于根据选择的所述第一呼叫响应消息中包含的所 述第二UE的标识，向所述第二UE的标识对应的所述第二UE发送中继Relay连接请求。
图9为本发明实施例提供的一种呼叫建立系统的结构示意图。所述呼叫建立系统包含第一用户设备UE91和第二UE92，其中：
第一UE91，用于广播呼叫建立消息，所述呼叫建立消息中包含所述第一UE的标识和被叫标识，所述被叫标识用于指示所述第一UE呼叫的群组或者UE；接收所述第二UE发送的第一呼叫响应消息，所述第一呼叫响应消息中包含所述第二UE的标识；根据接收到的所述第一呼叫响应消息，与所述第二UE的标识对应的第二UE建立呼叫连接；
第二UE92，用于接收所述第一UE广播的呼叫建立消息，根据所述呼叫建立消息中包含的被叫的标识，确定所述第二UE为所述被叫标识指示的UE或者所述被叫标识指示的群组中包含的UE，向所述第一UE发送第一呼叫响应消息。
可选的，所述呼叫建立系统中还包括第三UE93，其中：
所述第二UE92，具体用于在确定所述第二UE为所述被叫标识指示的UE或者所述被叫标识对应的群组中包含的UE时，广播第一呼叫响应消息；
所述第三UE93，用于接收所述第二UE广播的第一呼叫响应消息，所述第一呼叫响应消息中包含所述第二UE的标识和所述第一UE的标识，所述第一UE的标识是由所述第二UE从接收到所述第一UE广播的呼叫建立消息中获得的；根据接收到的所述第一呼叫响应消息中包含的所述第一UE的标识，确定与所述第一UE的标识对应的所述第一UE建立呼叫连接，并向所述第二UE发送中继Relay连接请求；
所述第二UE92，还用于接收所述第三UE发送的Relay连接请求，并向所述第三UE发送连接响应消息；
所述第三UE93，还用于根据接收到的所述连接响应消息，与所述第二UE之间建立Relay连接，并向所述第二UE发送第二呼叫响应消息，其中，所述第二呼叫响应消息中包含所述第三UE的标识。
可选地，所述第一UE91，还用于在广播呼叫建立消息之前，广播通知消息， 其中，所述通知消息中包含被叫标识和原因值，所述原因值用于表征所述被叫标识指示的UE或者所述被叫标识指示的群组中包含的UE为所述第一UE的寻呼对象；
所述第二UE92，还用于接收所述第一UE广播的通知消息，根据接收到的所述通知消息中包含的被叫标识，确定所述第二UE为所述被叫标识指示的UE或者所述第二UE为所述被叫标识指示的群组中包含的UE，以及根据接收到的所述通知消息中包含的原因值确定所述第二UE为所述第一UE的寻呼对象，向所述第一UE发送通知响应消息，其中，所述通知响应消息中包含所述第二UE的标识；
所述第一UE91，还用于接收所述第二UE发送的通知响应消息。
本领域的技术人员应明白，本发明的实施例可提供为方法、装置(设备)、或计算机程序产品。因此，本发明可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本发明可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。
本发明是参照根据本发明实施例的方法、装置(设备)和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使 得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
尽管已描述了本发明的优选实施例，但本领域内的技术人员一旦得知了基本创造性概念，则可对这些实施例作出另外的变更和修改。所以，所附权利要求意欲解释为包括优选实施例以及落入本发明范围的所有变更和修改。
显然，本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和范围。这样，倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内，则本发明也意图包含这些改动和变型在内。

Claims (21)

  1. 一种呼叫建立方法，其特征在于，包括：
    第一用户设备UE广播呼叫建立消息，其中，所述呼叫建立消息中包含所述第一UE的标识和被叫标识，所述被叫标识用于指示所述第一UE呼叫的群组或者UE；
    所述第一UE接收第二UE发送的第一呼叫响应消息，其中，所述第一呼叫响应消息中包含所述第二UE的标识，所述第一呼叫响应消息是所述第二UE根据接收到的所述呼叫建立消息中包含的所述被叫标识向所述第一UE发送的；
    所述第一UE根据接收到的所述第一呼叫响应消息，与所述第二UE的标识对应的第二UE建立呼叫连接。
  2. 如权利要求1所述的呼叫建立方法，其特征在于，所述方法还包括：
    所述第一UE接收所述第二UE发送的第二呼叫响应消息，其中，所述第二呼叫响应消息中包含第三UE的标识，所述第二呼叫响应消息是由第三UE发送给所述第二UE的，所述第二呼叫响应消息用于表征所述第三UE确定与所述第一UE之间通过所述第二UE建立呼叫连接，所述第三UE为所述被叫标识指示的UE或者所述被叫标识指示的群组中包含的UE。
  3. 如权利要求2所述的呼叫方法，其特征在于，所述第一呼叫响应消息中还包含所述第一UE的标识；
    所述第二呼叫响应消息是所述第三UE在接收到所述第二UE广播的第一呼叫响应消息时，根据所述第一呼叫响应消息中包含的所述第一UE的标识，确定与所述第一UE的标识对应的所述第一UE建立呼叫连接，向所述第二UE发送中继Relay连接请求，与所述第二UE之间建立Relay连接，并向所述第二UE发送的。
  4. 如权利要求1至3任一项所述的呼叫建立方法，其特征在于，所述第一UE在广播呼叫建立消息之前，所述方法还包括：
    所述第一UE广播通知消息，其中，所述通知消息中包含所述被叫标识和原因值，所述原因值用于表征所述被叫标识指示的UE或者所述被叫标识指示的群 组中包含的UE为所述第一UE的寻呼对象；
    所述第一UE接收所述第二UE发送的通知响应消息，其中，所述通知响应消息中包含所述第二UE的标识，所述通知响应消息是由所述第二UE根据所述通知消息中包含的所述原因值和所述被叫标识发送的；
    所述呼叫建立消息中还包含发送通知响应消息的所述第二UE的标识。
  5. 如权利要求1至4任一项所述的呼叫建立方法，其特征在于，所述第一UE接收第二UE发送的第一呼叫响应消息，包括：
    所述第一UE接收所述第二UE发送的200ok消息，其中，所述200ok消息中层Layer 2目标地址为所述群组的Layer 2地址。
  6. 一种呼叫建立方法，其特征在于，包括：
    第二用户设备UE接收第一UE广播的呼叫建立消息，其中，所述呼叫建立消息中包含所述第一UE的标识和被叫标识，所述被叫标识用于指示所述第一UE呼叫的群组或者UE；
    所述第二UE根据所述呼叫建立消息中包含的被叫标识，确定所述第二UE为所述被叫标识指示的UE或者所述被叫标识指示的群组中包含的UE；
    所述第二UE向所述第一UE发送第一呼叫响应消息，其中，所述第一呼叫响应消息中包含所述第二UE的标识。
  7. 如权利要求6所述的呼叫建立方法，其特征在于，所述第二UE在接收第一UE广播的呼叫建立消息之前，所述方法还包括：
    所述第二UE接收所述第一UE发送的通知消息，其中，所述通知消息中包含被叫标识和原因值，所述原因值用于表征所述被叫标识指示的UE或者所述被叫标识指示的群组中包含的UE为所述第一UE的寻呼对象；
    所述第二UE根据接收到的所述通知消息中包含的被叫标识，确定所述第二UE为所述被叫标识指示的UE或者所述第二UE为所述被叫标识指示的群组中包含的UE，以及根据接收到的所述通知消息中包含的原因值确定所述第二UE为所述第一UE的寻呼对象；
    所述第二UE向所述第一UE发送通知响应消息，其中，所述通知响应消息 中包含所述第二UE的标识。
  8. 一种呼叫建立方法，其特征在于，包括：
    第三用户设备UE接收第二UE广播的第一呼叫响应消息，其中，所述第一呼叫响应消息中包含所述第二UE的标识和第一UE的标识，所述第一UE的标识是由所述第二UE从接收到所述第一UE广播的呼叫建立消息中获得的；
    所述第三UE根据接收到的所述第一呼叫响应消息中包含的所述第一UE的标识，确定与所述第一UE的标识对应的所述第一UE建立呼叫连接，并向所述第二UE发送中继Relay连接请求；
    所述第三UE与所述第二UE之间建立Relay连接，向所述第二UE发送第二呼叫响应消息，其中，所述第二呼叫响应消息中包含所述第三UE的标识。
  9. 如权利要求8所述的呼叫建立方法，其特征在于，若所述第三UE接收到大于或者等于两个的所述第二UE广播的第一呼叫响应消息，所述方法还包括：
    所述第三UE从接收到的大于或者等于两个的所述第一呼叫响应消息中，选择其中一个所述第一呼叫响应消息；
    所述第三UE根据接收到的所述第一呼叫响应消息中包含的所述第一UE的标识，确定与所述第一UE的标识对应的所述第一UE建立呼叫连接，并向所述第二UE发送中继Relay连接请求，包括：
    所述第三UE根据选择的所述第一呼叫响应消息中包含的所述第一UE的标识，确定与所述第一UE的标识对应的所述第一UE建立呼叫连接；并根据选择的所述第一呼叫响应消息中包含的所述第二UE的标识，向所述第二UE的标识对应的所述第二UE发送中继Relay连接请求。
  10. 一种用户设备，其特征在于，所述用户设备为第一用户设备UE，包括：
    信号发射器，用于广播呼叫建立消息，其中，所述呼叫建立消息中包含所述第一UE的标识和被叫标识，所述被叫标识用于指示所述第一UE呼叫的群组或者UE；
    信号接收器，用于接收所述第二UE发送的第一呼叫响应消息，其中，所述 第一呼叫响应消息中包含所述第二UE的标识，所述第一呼叫响应消息是所述第二UE根据接收到的所述呼叫建立消息中包含的所述被叫标识向所述第一UE发送的；
    处理器，用于根据接收到的所述第一呼叫响应消息，与所述第二UE的标识对应的第二UE建立呼叫连接。
  11. 如权利要求10所述的用户设备，其特征在于，
    所述信号接收器，还用于接收所述第二UE发送的第二呼叫响应消息，其中，所述第二呼叫响应消息中包含第三UE的标识，所述第二呼叫响应消息是由所述第三UE发送给所述第二UE的，所述第二呼叫响应消息用于表征所述第三UE确定与所述第一UE之间通过所述第二UE建立呼叫连接，所述第三UE为所述被叫标识指示的UE或者所述被叫标识指示的群组中包含的UE。
  12. 如权利要求11所述的用户设备，其特征在于，所述第一呼叫响应消息中还包含所述第一UE的标识；
    所述第二呼叫响应消息是所述第三UE在接收到所述第二UE广播的第一呼叫响应消息时，根据所述第一呼叫响应消息中包含的所述第一UE的标识，确定与所述第一UE的标识对应的所述第一UE建立呼叫连接，向所述第二UE发送中继Relay连接请求，与所述第二UE之间建立Relay连接，并向所述第二UE发送的。
  13. 如权利要求10至12任一项所述的用户设备，其特征在于，
    所述信号发射器，还用于在广播呼叫建立消息之前，广播通知消息，其中，所述通知消息中包含所述被叫标识和原因值，所述原因值用于表征所述被叫标识指示的UE或者所述被叫标识指示的群组中包含的UE为所述第一UE的寻呼对象；
    所述信号接收器，还用于接收所述第二UE发送的通知响应消息，其中，所述通知响应消息中包含所述第二UE的标识，所述通知响应消息是由所述第二UE根据所述通知消息中包含的所述原因值和所述被叫标识发送的；
    所述呼叫建立消息中还包含发送通知响应消息的所述第二UE的标识。
  14. 如权利要求10至13任一项所述的用户设备，其特征在于，
    所述信号接收器，具体用于接收所述第二UE发送的200ok消息，其中，所述200ok消息中层Layer 2目标地址为所述群组的Layer 2地址。
  15. 一种用户设备，其特征在于，所述用户设备为第二用户设备UE，包括：
    信号接收器，用于接收第一UE广播的呼叫建立消息，其中，所述呼叫建立消息中包含所述第一UE的标识和被叫标识，所述被叫标识用于指示所述第一UE呼叫的群组或者UE；
    处理器，用于根据所述呼叫建立消息中包含的被叫标识，确定所述第二UE为所述被叫标识指示的UE或者所述被叫标识指示的群组中包含的UE；
    信号发射器，用于向所述第一UE发送第一呼叫响应消息，其中，所述第一呼叫响应消息中包含所述第二UE的标识。
  16. 如权利要求15所述的用户设备，其特征在于，
    所述信号接收器，还用于在接收第一UE广播的呼叫建立消息之前，接收所述第一UE发送的通知消息，其中，所述通知消息中包含被叫标识和原因值，所述原因值用于表征所述被叫标识指示的UE或者所述被叫标识指示的群组中包含的UE为所述第一UE的寻呼对象；
    所述处理器，还用于根据接收到的所述通知消息中包含的被叫标识，确定所述第二UE为所述被叫标识指示的UE或者所述第二UE为所述被叫标识指示的群组中包含的UE，以及根据接收到的所述通知消息中包含的原因值确定所述第二UE为所述第一UE的寻呼对象；
    所述信号发射器，还用于向所述第一UE发送通知响应消息，其中，所述通知响应消息中包含所述第二UE的标识。
  17. 一种用户设备，其特征在于，所述用户设备为第三用户设备UE，包括：
    信号接收器，用于接收第二UE广播的第一呼叫响应消息，其中，所述第一呼叫响应消息中包含所述第二UE的标识和第一UE的标识，所述第一UE的标识是由所述第二UE从接收到所述第一UE广播的呼叫建立消息中获得的；
    处理器，用于根据接收到的所述第一呼叫响应消息中包含的所述第一UE的 标识，确定与所述第一UE的标识对应的所述第一UE建立呼叫连接；
    信号发射器，用于向所述第二UE发送中继Relay连接请求；
    所述处理器，还用于与所述第二UE之间建立Relay连接；
    所述信号发射器，还用于向所述第二UE发送第二呼叫响应消息，其中，所述第二呼叫响应消息中包含所述第三UE的标识。
  18. 如权利要求17所述的用户设备，其特征在于，
    所述处理器，还用于若所述信号接收器接收到大于或者等于两个的所述第二UE广播的第一呼叫响应消息，从接收到的大于或者等于两个的所述第一呼叫响应消息中，选择其中一个所述第一呼叫响应消息；
    所述处理器根据接收到的所述第一呼叫响应消息中包含的所述第一UE的标识，确定与所述第一UE的标识对应的所述第一UE建立呼叫连接，并向所述第二UE发送中继Relay连接请求，包括：
    根据选择的所述第一呼叫响应消息中包含的所述第一UE的标识，确定与所述第一UE的标识对应的所述第一UE建立呼叫连接；并根据选择的所述第一呼叫响应消息中包含的所述第二UE的标识，向所述第二UE的标识对应的所述第二UE发送中继Relay连接请求。
  19. 一种呼叫建立系统，其特征在于，所述呼叫建立系统包含第一用户设备UE和第二UE，其中：
    第一UE，用于广播呼叫建立消息，所述呼叫建立消息中包含所述第一UE的标识和被叫标识，所述被叫标识用于指示所述第一UE呼叫的群组或者UE；接收所述第二UE发送的第一呼叫响应消息，所述第一呼叫响应消息中包含所述第二UE的标识；根据接收到的所述第一呼叫响应消息，与所述第二UE的标识对应的第二UE建立呼叫连接；
    第二UE，用于接收所述第一UE广播的呼叫建立消息，根据所述呼叫建立消息中包含的被叫的标识，确定所述第二UE为所述被叫标识指示的UE或者所述被叫标识指示的群组中包含的UE，向所述第一UE发送第一呼叫响应消息。
  20. 如权利要求19所述的呼叫建立系统，其特征在于，所述呼叫建立系统 中还包括第三UE，其中：
    所述第二UE，具体用于在确定所述第二UE为所述被叫标识指示的UE或者所述被叫标识对应的群组中包含的UE时，广播第一呼叫响应消息；
    所述第三UE，用于接收所述第二UE广播的第一呼叫响应消息，所述第一呼叫响应消息中包含所述第二UE的标识和所述第一UE的标识，所述第一UE的标识是由所述第二UE从接收到所述第一UE广播的呼叫建立消息中获得的；根据接收到的所述第一呼叫响应消息中包含的所述第一UE的标识，确定与所述第一UE的标识对应的所述第一UE建立呼叫连接，并向所述第二UE发送中继Relay连接请求；
    所述第二UE，还用于接收所述第三UE发送的Relay连接请求，并向所述第三UE发送连接响应消息；
    所述第三UE，还用于根据接收到的所述连接响应消息，与所述第二UE之间建立Relay连接，并向所述第二UE发送第二呼叫响应消息，其中，所述第二呼叫响应消息中包含所述第三UE的标识。
  21. 如权利要求19或20所述的呼叫建立系统，其特征在于，
    所述第一UE，还用于在广播呼叫建立消息之前，广播通知消息，其中，所述通知消息中包含被叫标识和原因值，所述原因值用于表征所述被叫标识指示的UE或者所述被叫标识指示的群组中包含的UE为所述第一UE的寻呼对象；
    所述第二UE，还用于接收所述第一UE广播的通知消息，根据接收到的所述通知消息中包含的被叫标识，确定所述第二UE为所述被叫标识指示的UE或者所述第二UE为所述被叫标识指示的群组中包含的UE，以及根据接收到的所述通知消息中包含的原因值确定所述第二UE为所述第一UE的寻呼对象，向所述第一UE发送通知响应消息，其中，所述通知响应消息中包含所述第二UE的标识；
    所述第一UE，还用于接收所述第二UE发送的通知响应消息。
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