WO2018072202A1 - 一种终端的呼叫业务切换方法及装置 - Google Patents

一种终端的呼叫业务切换方法及装置 Download PDF

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Publication number
WO2018072202A1
WO2018072202A1 PCT/CN2016/102893 CN2016102893W WO2018072202A1 WO 2018072202 A1 WO2018072202 A1 WO 2018072202A1 CN 2016102893 W CN2016102893 W CN 2016102893W WO 2018072202 A1 WO2018072202 A1 WO 2018072202A1
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WIPO (PCT)
Prior art keywords
terminal
call
communication link
call service
service communication
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PCT/CN2016/102893
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English (en)
French (fr)
Inventor
关洪军
陈钢
尧俊峰
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海能达通信股份有限公司
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Application filed by 海能达通信股份有限公司 filed Critical 海能达通信股份有限公司
Priority to PCT/CN2016/102893 priority Critical patent/WO2018072202A1/zh
Publication of WO2018072202A1 publication Critical patent/WO2018072202A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H04W36/144—Reselecting a network or an air interface over a different radio air interface technology
    • H04W36/1446—Reselecting a network or an air interface over a different radio air interface technology wherein at least one of the networks is unlicensed

Definitions

  • the present application relates to the field of communications, and in particular, to a call service switching method and apparatus for a terminal.
  • the converged core network supports dual-mode terminals access through LTE networks and access via Wi-Fi (Wireless-Fidelity).
  • the existing converged core network considers that LTE access and Wi-Fi access are two different network connections, when the terminal switches from the LTE network to the Wi-Fi network to access the converged core network or switch from the Wi-Fi network
  • the old network that is, the network connected before the handover
  • the new network the network to be switched to
  • the call service will be interrupted, and the interrupted call service will be restored after establishing a connection with the new network. It can be seen that the terminal cannot maintain the continuity of the call service when performing network handover, resulting in poor user experience.
  • the embodiment of the present application provides a call service switching method and device for a terminal, so as to achieve the purpose of maintaining the continuity of the call service, thereby improving user experience.
  • the technical solution is as follows:
  • a method for switching a call service of a terminal comprising:
  • the first call service communication link is released.
  • the process of communicating with the terminal by using the first call service communication link and the second call service communication link includes:
  • the process of communicating with the terminal by using the first call service communication link and the second call service communication link includes:
  • the process of communicating with the terminal by using the first call service communication link and the second call service communication link includes:
  • the terminal is connected to the group call on the target access network
  • the process of communicating with the terminal by using the first call service communication link and the second call service communication link includes:
  • the terminal is connected to the group call on the target access network
  • the method further includes:
  • the first registration information is cancelled.
  • a call service switching device for a terminal comprising:
  • a receiving unit configured to receive, by the terminal, second registration information that carries a handover indication
  • a establishing unit configured to parse the switching indication from the second registration information, and simultaneously hold the first registration information and the second registration information according to the interception instruction obtained by the parsing, and according to the second registration information, Establishing a second call service communication link on the network, where the first registration information is registration information that the terminal communicates through the source access network;
  • a communication unit configured to communicate with the terminal by using a first call service communication link and the second call service communication link, where the first call service communication link is established on a source access network Link
  • a release unit configured to release the first call service communication link.
  • the communication unit comprises:
  • a first sending sub-unit configured to send single-call user data to the terminal by using the first call service communication link
  • a second sending sub-unit configured to send, by using the second call service communication link, single-call user data to the terminal, so that the terminal pair communicates with the first call service communication link and the second call service
  • the single-call user data received by the link performs deduplication and merging operations.
  • the communication unit comprises:
  • a first reclaiming subunit configured to recover a first call right of the terminal, where the first call right is a single call right granted to the terminal when the terminal uses the source access network;
  • a first granting subunit configured to grant the second right to the terminal, so that the terminal uses the leaflet call user data on the second call service communication link.
  • the communication unit comprises:
  • a first access subunit configured to access the terminal to the group call on the target access network
  • a third sending sub-unit configured to send the group calling user data to the terminal by using the first call service communication link
  • a fourth sending sub-unit configured to send, by the second call service communication link, group call user data to the terminal, so that the terminal pair communicates with the second call service communication link through the first call service communication link
  • the group call user data received by the link performs deduplication and merge operations.
  • the communication unit comprises:
  • a second access subunit configured to access the terminal to the group call on the target access network
  • a second reclaiming unit configured to recover a third call right of the terminal, where the third call right is a group call right granted to the terminal when the terminal uses the source access network;
  • a second granting subunit configured to grant the fourth call right to the terminal, so that the terminal uploads the group call user data by using the second call service communication link.
  • the method further includes:
  • a logout unit configured to cancel the first registration information.
  • a terminal is configured to send second registration information carrying a handover indication to one end of a converged core network.
  • a fused core network server configured to receive second registration information that is sent by the terminal and that carries the handover indication, and parse the handover indication from the second registration information, and obtain the second registration information and the analysis according to the second registration information
  • the switching indication establishing a second call service communication link on the target access network, and communicating with the terminal by using the first call service communication link and the second call service communication link, where A call service communication link is a link established by the fused core network on the source access network, and releases the first call service communication link.
  • the fused core network when the terminal requests to switch from the source access network to the target access network, the fused core network receives the second registration information carrying the handover indication on the premise of maintaining the connection of the first call service communication link. Parsing the handover indication in the second registration information, maintaining the first registration information and the second registration information according to the interception indication obtained by the parsing, and establishing a second on the target access network according to the second registration information Calling a service communication link, and communicating with the terminal through the second call service communication link and the first call service communication link, releasing the first call service communication after communicating with the terminal through the second call service communication link link.
  • the call service Since the terminal has established a connection with the target access network when the first call service communication link is disconnected, the call service is not interrupted during the process of the terminal switching from the source access network to the target access network, and the call service is maintained. Continuity, which improves user experience.
  • FIG. 1 is a flowchart of a call service switching method of a terminal provided by the present application
  • FIG. 2 is a sub-flow diagram of a call service switching method of a terminal provided by the present application
  • FIG. 3 is another seed flowchart of a call service switching method of a terminal provided by the present application.
  • FIG. 5 is another flowchart of a call service switching method of a terminal provided by the present application.
  • FIG. 6 is still another flowchart of a call service switching method of a terminal provided by the present application.
  • FIG. 7 is still another flowchart of a call service switching method of a terminal provided by the present application.
  • FIG. 9 is another flowchart of a method for switching a call service of a terminal provided by the present application.
  • FIG. 10 is a schematic diagram of a logical structure of a call service switching apparatus of a terminal provided by the present application.
  • a call service switching method for a terminal is provided, which is applied to one end of a converged core network.
  • FIG. 1 it is a flowchart of a call service switching method of a terminal provided by the present application, which may include the following steps:
  • Step S11 Receive second registration information that is sent by the terminal and that carries the handover indication.
  • the terminal When the terminal requests to switch from the source access network to the target access network, the terminal sends the second registration information carrying the handover indication to one end of the fused core network.
  • the source access network may be an LTE network, and the corresponding target access network is Wi-Fi; or the source access network is specifically Wi-Fi, and the corresponding target access network is an LTE network.
  • the registration message in the existing standard is extended to add a handover indication to inform the fusion core network terminal that network switching is required. Because the registration message carries the handover indication, the terminal does not need to separately send the handover request message. Compared with the prior art, the handover process needs to send the registration message and the handover request message when performing network handover, thereby reducing the handover process. , improve switching efficiency.
  • Step S12 parsing the handover indication from the second registration information, maintaining the first registration information and the second registration information according to the handover indication obtained by the parsing, and in the target access network according to the second registration information. Establishing a second call service communication link.
  • the first registration information is registration information that the terminal communicates through the source access network.
  • the first registration information is not covered, while the first registration information and the second registration information are maintained, to maintain the first call service communication link and the second The connection of the call service communication link provides the basis.
  • the first registration information is registration information that the terminal communicates through the source access network.
  • the first call service communication link is a link established by the converged core network on the source access network.
  • the process of establishing a second call service communication link on the target access network according to the second registration information is the same as the process of establishing a communication link according to the registration information in the prior art. Let me repeat.
  • Step S13 Communicate with the terminal through the first call service communication link and the second call service communication link.
  • step S14 is performed.
  • Step S14 Release the first call service communication link.
  • the first call service communication link is released to ensure smooth handover from the source access network to the target access network.
  • the converged core network receives and carries the handover indication while maintaining the connection of the first call service communication link.
  • the second registration information parsing the switching instruction from the second registration information, maintaining the first registration information and the second registration information according to the interception instruction obtained by the parsing, and in the target according to the second registration information Establishing a second call service communication link on the access network, and communicating with the terminal through the second call service communication link and the first call service communication link, after communicating with the terminal through the second call service communication link, The first call service communication link is released.
  • the call service Since the terminal has established a connection with the target access network when the first call service communication link is disconnected, the call service is not interrupted during the process of the terminal switching from the source access network to the target access network, and the call service is maintained. Continuity, which improves user experience.
  • two call service communication links ie, the first call service communication link and the second call service communication link
  • the communication link can improve the success rate of voice data reception, thereby improving the call quality.
  • the process of communicating with the terminal by using the first call service communication link and the second call service communication link is specifically:
  • the purpose of deduplication and merging operations is to improve the quality of the call.
  • the single call service data is sent to the terminal through the second call service communication link, and the single call is sent to the terminal through the first call service communication link.
  • User data so the terminal receives two single-call user data, and correspondingly, the terminal needs to perform de-duplication and merge operations.
  • the terminal when the terminal receives the same single-call user data on the first call service communication link and the second call service communication link, the terminal performs a de-duplication operation (ie, removes the repeated single-call user data).
  • a de-duplication operation ie, removes the repeated single-call user data.
  • the terminal may perform a merge operation (ie, two links Single call user data is merged).
  • Figure 2 when the call service of the terminal is a single caller, the process of communicating with the terminal through the first call service communication link and the second call service communication link is shown.
  • Figure 2 can include the following steps:
  • Step S21 Reclaiming the first right of the terminal.
  • the first call right is a single call right granted to the terminal when the terminal uses the source access network.
  • Step S22 Granting a second right to the terminal, so that the terminal uses the leaflet call user data on the second call service communication link.
  • the terminal uses the leaflet to call the user data on the second call service communication link.
  • the process of communicating with the terminal by using the second call service communication link and the first call service communication link is shown in FIG. 3. , can include the following steps:
  • Step S31 The terminal is connected to the group call on the target access network.
  • the terminal has accessed the group call on the source access network before switching to the target access network.
  • Step S32 The group call user data is sent to the terminal by using the first call service communication link.
  • Step S33 The group call user data is sent to the terminal through the second call service communication link, so that the terminal receives the group received through the first call service communication link and the second call service communication link. Call user data for deduplication and merge operations.
  • the first call service communication link is sent through the second call service communication link to the terminal to send the group call user data.
  • the user data is sent to the terminal, so the terminal receives two groups of user data, and correspondingly, the terminal needs to perform deduplication and merge operations.
  • the terminal when the terminal receives the same group call user data on the first call service communication link and the second call service communication link, the terminal performs a deduplication operation (ie, removes duplicate group call user data).
  • a deduplication operation ie, removes duplicate group call user data.
  • the terminal may perform a merge operation (ie, two links The group calls the user data for merging).
  • the process of communicating with the terminal through the first call service communication link and the second call service communication link is shown in FIG. 4 .
  • Step S41 The terminal is connected to the group call on the target access network.
  • the terminal has accessed the group call on the source access network before switching to the target access network.
  • Step S42 Reclaiming the third right of the terminal.
  • the third call right is a group call right granted to the terminal when the terminal uses the source access network.
  • Step S43 Granting a fourth call right to the terminal, so that the terminal uploads the group call user data by using the second call service communication link.
  • the call service at the terminal is called a group call.
  • the method for switching the call service of the terminal when the call service of the terminal is the call of the group call is described as follows:
  • Example 1 In this example, the call service switching method of the terminal is described when the call service of the terminal is a single call, as shown in FIG. 5.
  • the terminal needs to switch from the LTE network to the WiFi network.
  • the UE in FIG. 5 represents the terminal, and the eMME, TCF, and TMF are network elements in the fused core network, and the TCF is responsible for signaling interaction with the terminal, and the TMF is responsible for user data interaction with the terminal.
  • Messages 1 to 4 in FIG. 5 indicate that the terminal needs to switch between networks by carrying the handover indication in the registration information; messages 5 to 8 indicate that the fusion core network establishes a new link on the new network (ie, the WiFi network); User data can be sent and received on the new link.
  • the terminal side receives user data on both links (the original link on the LET network and the newly established link on the WiFi network), and maintains the data through deduplication and merge operations.
  • the service is continuous; messages 9 to 12 release the old network connection (ie, release the LET network connection), and steps 13 to 16 cancel the old user registration information (ie, log out of the LET network registration information) to complete the handover process.
  • Steps 1-4 1.
  • the UE sends a SIP (REGISTER) HO indication to the TCF, and the SIP (REGISTER) HO indication indicates that the REGISTER carries the handover indication (ie, HO indication) through the SIP protocol; 2.
  • the TCF returns the SIP (401 Unauthorized) to the UE.
  • the UE sends a SIP (REGISTER) HO indication to the TCF, the TCF registers the terminal carrying the HO indication, does not overwrite the existing LTE registration information; 4, the TCF returns SIP (200 OK) to the UE, and performs a FORK call (ie, Make another call to the UE).
  • a FORK call ie, Make another call to the UE.
  • step 2 Where 401 Unauthorized in step 2 indicates that the authentication failed, so the UE receives the TCF. After the returned SIP (401 Unauthorized), the SIP (REGISTER) HO indication is resent to TCF, and step 3 is performed.
  • Step 5-8 the TCF sends a SIP (INVITE) to the UE, invites the UE to join the WiFi network; 6.
  • the terminal returns SIP (100 Trying) to the TCF; 7.
  • the terminal returns SIP (200 OK) to the TCF; 8.
  • the TCF returns SIP (ACK), indicating that the call session is established, and notifying the TMF to establish a UDP media channel (ie, establishing a second call service communication link).
  • the TMF sends the media (that is, the user data) to the UE. Since the UE receives the user data sent by the first call service communication link and the second call service communication link, the UE performs deduplication. And merge operations.
  • Step 9-12:9 the TCF sends a SIP (BYE) message to the eMME; 10, the eMME converts the SIP (BYE) message into a CALL RELEASE REQUEST message that the UE can recognize, and sends the message to the UE; 11.
  • the UE returns CALL RELEASE RESPONSE The message to the eMME; 12, the eMME converts the CALL RELEASE RESPONSE message into a SIP (200 OK) message and sends it to the TCF.
  • the TCF notifies the TMF to release the LTE side bearer (ie, notifies the TMF to release the first call service communication link).
  • Step 13-16 After the TCF releases the first call service communication link, the TCF cancels the LTE registration information. 13.
  • the TCF sends a SIP (Options) to the eMME. 14.
  • the eMME converts the SIP (Options) into a TRUNKING DEREGISTER REQUEST that the UE can recognize and sends to the UE.
  • the UE returns TRUNKING DEREGISTER ACCEPT to eMME; 16.
  • the eMME converts the TRUNKING DEREGISTER ACCEPT to SIP (200 OK) and sends it to the TCF to complete the handover process.
  • Example 2 In this example, the call service switching method of the terminal is described when the call service of the terminal is a single call, as shown in FIG. 6.
  • the terminal needs to switch from the LTE network to the WiFi network.
  • the UE in FIG. 6 represents the terminal, and the eMME, TCF, and TMF are network elements in the fused core network, and the TCF is responsible for signaling interaction with the terminal, and the TMF is responsible for user data interaction with the terminal.
  • Messages 1 to 4 in FIG. 6 indicate that the terminal needs to switch between networks by carrying a handover indication in the registration information; messages 5 to 8 indicate that the fusion core network establishes a new link on the new network (ie, the WiFi network);
  • the work order calls, the integrated core network reclaims the old network call right (ie, the LTE network call right), grants the new network call right (ie, the WiFi network call right), and then the terminal uses the new link to upload the user data; the message 9-12 releases the old one.
  • Network connection ie release LET network connection
  • steps 13 to 16 log out the old user registration information (ie, log out LET network registration information), complete the handover process.
  • Step 1-4 1.
  • the UE sends a SIP (REGISTER) HO indication to the TCF.
  • SIP (REGISTER) HO indication indicates that the REGISTER carries the handover indication (ie, HO indication) through the SIP protocol; 2.
  • the TCF returns SIP (401 Unauthorized) to the UE; 3.
  • the UE sends the SIP (REGISTER) HO indication to the TCF, and the TCF pair carries the HO.
  • the indicated terminal performs registration, does not overwrite the existing LTE registration information; 4.
  • the TCF returns SIP (200 OK) to the UE, and performs a FORK call (ie, makes another call to the UE).
  • Step 5-8 the TCF sends a SIP (INVITE) to the UE, invites the UE to join the WiFi network; 6.
  • the terminal returns SIP (100 Trying) to the TCF; 7.
  • the terminal returns SIP (200 OK) to the TCF; 8.
  • the TCF returns to the SIP. (ACK), indicating that the call session is established, and notifying the TMF to establish a UDP media channel (ie, establishing a second call service communication link).
  • the TMF grants the new network voice to the UE and reclaims the old network voice.
  • the UE After the UE is granted the new network call right, the UE buffers part of the voice data from the old network call right to the new network call right to upload the buffered partial voice data on the second call service communication link.
  • the UE sends a Media (including the buffered partial voice data) to the TMF.
  • Step 9-12:9 the TCF sends a SIP (BYE) message to the eMME; 10, the eMME converts the SIP (BYE) message into a CALL RELEASE REQUEST message that the UE can recognize, and sends the message to the UE; 11.
  • the UE returns CALL RELEASE RESPONSE The message to the eMME; 12, the eMME converts the CALL RELEASE RESPONSE message into a SIP (200 OK) message and sends it to the TCF.
  • the TCF notifies the TMF to release the LTE side bearer (ie, notifies the TMF to release the first call service communication link).
  • Step 13-16 After the TCF releases the first call service communication link, the TCF cancels the LTE registration information. 13.
  • the TCF sends a SIP (Options) to the eMME. 14.
  • the eMME converts the SIP (Options) into a TRUNKING DEREGISTER REQUEST that the UE can recognize and sends to the UE.
  • the UE returns TRUNKING DEREGISTER ACCEPT to eMME; 16.
  • the eMME converts the TRUNKING DEREGISTER ACCEPT to SIP (200 OK) and sends it to the TCF to complete the handover process.
  • Example 3 In this example, the call service switching method of the terminal is described when the call service of the terminal is a group call, and FIG. 7 is shown.
  • the terminal needs to switch from the LTE network to the WiFi network.
  • the UE in FIG. 7 represents a terminal, and the eMME, the TCF, and the TMF are network elements in the fused core network, and the TCF is responsible for signaling interaction with the terminal, and the TMF is responsible for performing user data interaction with the terminal.
  • Messages 1 to 4 in FIG. 7 indicate that the terminal needs to switch between networks by carrying a handover indication in the registration information; messages 5 to 8 indicate that the fusion core network establishes a new link on the new network (ie, the WiFi network) and The terminal is connected to the group call on the WiFi network; afterwards, the fused core network can send and receive user data on the new link, and the terminal side is on two links (the original link on the LET network and the newly established link on the WiFi network). ) Receive user data, maintain business continuity through deduplication and merge operations; messages 9 to 12 release old network connections (ie release LET network connection), steps 13 to 16 log out old user registration information (ie, log off LET network) Registration information), complete the switching process.
  • messages 9 to 12 release old network connections (ie release LET network connection), steps 13 to 16 log out old user registration information (ie, log off LET network) Registration information), complete the switching process.
  • Steps 1-4 1.
  • the UE sends a SIP (REGISTER) HO indication to the TCF, and the SIP (REGISTER) HO indication indicates that the REGISTER carries the handover indication (ie, HO indication) through the SIP protocol; 2.
  • the TCF returns the SIP (401 Unauthorized) to the UE.
  • the UE sends a SIP (REGISTER) HO indication to the TCF, the TCF registers the terminal carrying the HO indication, does not overwrite the existing LTE registration information; 4, the TCF returns SIP (200 OK) to the UE, and will be on the WiFi network
  • the terminal accesses the group call.
  • Step 5-8 the TCF sends a SIP (INVITE) to the UE, invites the UE to join the WiFi network; 6.
  • the terminal returns SIP (100 Trying) to the TCF; 7.
  • the terminal returns SIP (200 OK) to the TCF; 8.
  • the TCF returns SIP (ACK), indicating that the call session is established, and notifying the TMF to establish a UDP media channel (ie, establishing a second call service communication link).
  • the TMF sends the media (that is, the user data) to the UE. Since the UE receives the user data sent by the first call service communication link and the second call service communication link, the UE performs deduplication. And merge operations.
  • Step 9-12:9 the TCF sends a SIP (BYE) message to the eMME; 10, the eMME converts the SIP (BYE) message into a CALL RELEASE REQUEST message that the UE can recognize, and sends the message to the UE; 11.
  • the UE returns CALL RELEASE RESPONSE The message to the eMME; 12, the eMME converts the CALL RELEASE RESPONSE message into a SIP (200 OK) message and sends it to the TCF.
  • the TCF notifies the TMF to release the LTE side bearer (ie, notifies the TMF to release the first call service communication link).
  • Step 13-16 After the TCF releases the first call service communication link, the TCF cancels the LTE registration information. 13.
  • the TCF sends a SIP (Options) to the eMME. 14.
  • the eMME converts the SIP (Options) into a TRUNKING DEREGISTER REQUEST that the UE can recognize and sends to the UE.
  • the UE returns TRUNKING DEREGISTER ACCEPT to eMME; 16.
  • the eMME converts the TRUNKING DEREGISTER ACCEPT to SIP (200 OK) and sends it to the TCF to complete the handover process.
  • Example 4 In this example, the call service switching method of the terminal is described when the call service of the terminal is a group call, as shown in FIG. 8. In this example, the terminal needs to switch from LET network to WiFi.
  • the internet The UE in FIG. 8 represents the terminal, and the eMME, TCF, and TMF are network elements in the fused core network, and the TCF is responsible for signaling interaction with the terminal, and the TMF is responsible for performing user data interaction with the terminal.
  • Messages 1 to 4 in FIG. 8 indicate that the terminal needs to switch between networks by carrying the handover indication in the registration information; messages 5 to 8 indicate that the fusion core network will newly establish a link on the new network (ie, the WiFi network) on the WiFi network.
  • the terminal accesses the group call; after that, the converged core network reclaims the old network call right (ie, the LTE network call right), grants the new network call right (ie, the WiFi network call right), and then the terminal uploads the user data by using the new link; message 9-12 Release the old network connection (ie release the LET network connection), and steps 13 to 16 to log out the old user registration information (ie, log out of the LET network registration information) to complete the handover process.
  • Steps 1-4 1.
  • the UE sends a SIP (REGISTER) HO indication to the TCF, and the SIP (REGISTER) HO indication indicates that the REGISTER carries the handover indication (ie, HO indication) through the SIP protocol; 2.
  • the TCF returns the SIP (401 Unauthorized) to the UE.
  • the UE sends a SIP (REGISTER) HO indication to the TCF, the TCF registers the terminal carrying the HO indication, does not overwrite the existing LTE registration information; 4, the TCF returns SIP (200 OK) to the UE, and will be on the WiFi network
  • the terminal accesses the group call.
  • Step 5-8 the TCF sends a SIP (INVITE) to the UE, invites the UE to join the WiFi network; 6.
  • the terminal returns SIP (100 Trying) to the TCF; 7.
  • the terminal returns SIP (200 OK) to the TCF; 8.
  • the TCF returns SIP (ACK), indicating that the call session is established, and notifying the TMF to establish a UDP media channel (ie, establishing a second call service communication link).
  • the TMF grants the new network voice to the UE and reclaims the old network voice.
  • the UE After the UE is granted the new network call right, the UE buffers part of the voice data from the old network call right to the new network call right to upload the buffered partial voice data on the second call service communication link.
  • the UE sends a Media (including the buffered partial voice data) to the TMF.
  • Step 9-12:9 the TCF sends a SIP (BYE) message to the eMME; 10, the eMME converts the SIP (BYE) message into a CALL RELEASE REQUEST message that the UE can recognize, and sends the message to the UE; 11.
  • the UE returns CALL RELEASE RESPONSE The message to the eMME; 12, the eMME converts the CALL RELEASE RESPONSE message into a SIP (200 OK) message and sends it to the TCF.
  • the TCF notifies the TMF to release the LTE side bearer (ie, notifies the TMF to release the first call service communication link).
  • Step 13-16 After the TCF releases the first call service communication link, the TCF cancels the LTE registration information. 13.
  • the TCF sends a SIP (Options) to the eMME. 14.
  • the eMME converts the SIP (Options) into a TRUNKING DEREGISTER REQUEST that the UE can recognize and sends to the UE.
  • the UE returns TRUNKING DEREGISTER ACCEPT to eMME; 16, eMME Convert TRUNKING DEREGISTER ACCEPT to SIP (200OK) and send it to TCF to complete the switching process.
  • the principle of the specific example of the call service switching method of the terminal is the same as that of the first example, and details are not described herein.
  • the call service of the terminal is a single-call caller.
  • the principle of the specific example of the call service switching method of the terminal is the same as that of the second embodiment.
  • the principle of the specific example of the call service switching method of the terminal is the same as that of the third embodiment, and is not described here again; the call service at the terminal is a group call, When the WiFi network is switched to the LTE network, the principle of the specific example of the call service switching method of the terminal is the same as that of the fourth embodiment, and details are not described herein again.
  • the method further includes the following steps:
  • Step S15 Deregister the first registration information.
  • the first registration information is deregistered to reduce memory usage.
  • this embodiment provides a call service switching apparatus for a terminal.
  • the call service switching apparatus of the terminal includes: a receiving unit 101, an establishing unit 102, a communication unit 103, and a releasing unit 104. .
  • the receiving unit 101 is configured to receive second registration information that is sent by the terminal when the request is switched from the source access network to the target access network and carries the handover indication.
  • the establishing unit 102 is configured to parse the handover indication from the second registration information, and maintain the first registration information and the second registration information according to the handover indication obtained by the parsing, and according to the second registration information, the target Establishing a second call service communication link on the access network, where the first registration information is registration information that the terminal communicates through the source access network.
  • the communication unit 103 is configured to communicate with the terminal by using a first call service communication link and the second call service communication link, where the first call service communication link is a converged core network on a source access network. Established link.
  • the release unit 104 is configured to release the first call service communication link.
  • the communication unit 103 may specifically include: a first sending subunit and a second lower Hair unit.
  • a first sending subunit configured to send a single call user data to the terminal by using the first call service communication link
  • a second sending sub-unit configured to send, by using the second call service communication link, single-call user data to the terminal, so that the terminal pair communicates with the first call service communication link and the second call service
  • the single-call user data received by the link performs deduplication and merging operations.
  • the first sending subunit and the second sending subunit are executed.
  • the communication unit 103 may specifically include: a first recycling subunit and a first granting subunit.
  • a first callback unit configured to recover a first call right of the terminal, where the first call right is a single call right granted to the terminal when the terminal uses the source access network.
  • a first granting subunit configured to grant the second right to the terminal, so that the terminal uses the leaflet call user data on the second call service communication link.
  • the first recycling subunit and the first granting subunit are executed.
  • the communication unit 103 may specifically include: a first access subunit, a third delivery subunit, and a fourth delivery subunit.
  • the first access subunit is configured to access the terminal to the group call on the target access network.
  • a third sending sub-unit configured to send the group calling user data to the terminal by using the first call service communication link.
  • a fourth sending sub-unit configured to send, by the second call service communication link, group call user data to the terminal, so that the terminal pair communicates with the second call service communication link through the first call service communication link
  • the group call user data received by the link performs deduplication and merge operations.
  • the first access subunit and the second delivery subunit are executed.
  • the communication unit 103 may specifically include: a second access subunit, a second reclaiming subunit, and a second granting subunit.
  • a second access subunit configured to access the terminal to the group call on the target access network.
  • a second recycling subunit configured to recover a third right of the terminal, where the third right is the end The group call right granted to the terminal when the source accesses the network.
  • a second granting subunit configured to grant the fourth call right to the terminal, so that the terminal uploads the group call user data by using the second call service communication link.
  • the second access subunit, the second reclaiming subunit, and the second granting subunit are executed.
  • the call service switching apparatus of the terminal shown in FIG. 10 may further include: a logout unit, configured to cancel the first registration information.
  • a terminal is provided for transmitting the second registration information carrying the handover indication to one end of the fused core network.
  • a converged core network server for receiving the second registration information that is sent by the terminal and carrying the handover indication, and parsing the handover indication from the second registration information, and according to The second registration information and the parsing result of the handover, establishing a second call service communication link on the target access network, and the first call service communication link and the second call service communication link
  • the terminal performs communication, and the first call service communication link is a link established by the fused core network on the source access network, and releases the first call service communication link.

Abstract

本申请提供了一种终端的呼叫业务切换方法及装置，终端的呼叫业务切换方法包括：接收终端发送的携带有切换指示的第二注册信息；从第二注册信息中解析出切换指示，根据解析得到的切换指示同时保持第一注册信息和第二注册信息，并根据第二注册信息，在目标接入网络上建立第二呼叫业务通信链路；通过第一呼叫业务通信链路和第二呼叫业务通信链路与终端进行通信；释放第一呼叫业务通信链路。在本申请中，通过以上方式可以保持呼叫业务的连续性，从而改善用户体验性。

Description

一种终端的呼叫业务切换方法及装置 技术领域
本申请涉及通信领域，特别涉及一种终端的呼叫业务切换方法及装置。
背景技术
在LTE(长期演进，Long Term Evolution)集群系统中，融合核心网支持双模终端通过LTE网络接入和通过Wi-Fi(Wireless-Fidelity，无线网)接入。
其中，由于现有融合核心网认为LTE接入和Wi-Fi接入是两个不同的网络连接，因此当终端从LTE网络切换到Wi-Fi网络接入融合核心网或从Wi-Fi网络切换到LTE网络接入融合核心网时，会断开旧网络(即切换前连接的网络)连接，并重新与新网络(即将要切换至的网络)建立连接，在旧网络连接断开时正在进行的呼叫业务将会中断，在与新网络建立连接后，中断的呼叫业务才会恢复。可见，终端在进行网络切换时不能保持呼叫业务的连续性，导致用户体验性差。
发明内容
为解决上述技术问题，本申请实施例提供一种终端的呼叫业务切换方法及装置，以达到保持呼叫业务的连续性，从而改善用户体验性的目的，技术方案如下：
一种终端的呼叫业务切换方法，包括：
接收终端发送的携带有切换指示的第二注册信息；
从所述第二注册信息中解析出所述切换指示，根据解析得到的切换指示同时保持第一注册信息和第二注册信息，并根据所述第二注册信息，在目标接入网络上建立第二呼叫业务通信链路，所述第一注册信息为所述终端通过所述源接入网络通信的注册信息；
通过第一呼叫业务通信链路和所述第二呼叫业务通信链路与所述终端进行通信，所述第一呼叫业务通信链路为融合核心网在源接入网络上建立的链 路；
释放第一呼叫业务通信链路。
优选的，在所述终端的呼叫业务为单呼被叫时，通过第一呼叫业务通信链路和所述第二呼叫业务通信链路与所述终端进行通信的过程，包括：
通过所述第一呼叫业务通信链路向所述终端下发单呼用户数据；
通过所述第二呼叫业务通信链路向所述终端下发单呼用户数据，以使所述终端对通过第一呼叫业务通信链路和第二呼叫业务通信链路接收到的单呼用户数据进行去重及合并操作。
优选的，在所述终端的呼叫业务为单呼主叫时，通过第一呼叫业务通信链路和所述第二呼叫业务通信链路与所述终端进行通信的过程，包括：
回收所述终端的第一话权，所述第一话权为所述终端使用所述源接入网络时，向所述终端授予的单呼话权；
向所述终端授予第二话权，以使所述终端使用所述第二呼叫业务通信链路上传单呼用户数据。
优选的，在所述终端的呼叫业务为组呼被叫时，通过第一呼叫业务通信链路和所述第二呼叫业务通信链路与所述终端进行通信的过程，包括：
在目标接入网络上将所述终端接入组呼；
通过所述第一呼叫业务通信链路向所述终端下发组呼用户数据；
通过所述第二呼叫业务通信链路向所述终端下发组呼用户数据，以使所述终端对通过第一呼叫业务通信链路和第二呼叫业务通信链路接收到的组呼用户数据进行去重及合并操作。
优选的，在所述终端的呼叫业务为组呼主叫时，通过第一呼叫业务通信链路和所述第二呼叫业务通信链路与所述终端进行通信的过程，包括：
在目标接入网络上将所述终端接入组呼；
回收所述终端的第三话权，所述第三话权为所述终端使用所述源接入网络时，向所述终端授予的组呼话权；
向所述终端授予第四话权，以使所述终端使用所述第二呼叫业务通信链路上传组呼用户数据。
优选的，所述释放第一呼叫业务通信链路之后，还包括：
注销所述第一注册信息。
一种终端的呼叫业务切换装置，包括：
接收单元，用于接收终端发送的携带有切换指示的第二注册信息；
建立单元，用于从所述第二注册信息中解析出所述切换指示，根据解析得到的切换指示同时保持第一注册信息和第二注册信息，并根据所述第二注册信息，在目标接入网络上建立第二呼叫业务通信链路，所述第一注册信息为所述终端通过所述源接入网络通信的注册信息；
通信单元，用于通过第一呼叫业务通信链路和所述第二呼叫业务通信链路与所述终端进行通信，所述第一呼叫业务通信链路为融合核心网在源接入网络上建立的链路；
释放单元，用于释放第一呼叫业务通信链路。
优选的，所述通信单元包括：
第一下发子单元，用于通过所述第一呼叫业务通信链路向所述终端下发单呼用户数据；
第二下发子单元，用于通过所述第二呼叫业务通信链路向所述终端下发单呼用户数据，以使所述终端对通过第一呼叫业务通信链路和第二呼叫业务通信链路接收到的单呼用户数据进行去重及合并操作。
优选的，所述通信单元包括：
第一回收子单元，用于回收所述终端的第一话权，所述第一话权为所述终端使用所述源接入网络时，向所述终端授予的单呼话权；
第一授予子单元，用于向所述终端授予第二话权，以使所述终端使用所述第二呼叫业务通信链路上传单呼用户数据。
优选的，所述通信单元包括：
第一接入子单元，用于在目标接入网络上将所述终端接入组呼；
第三下发子单元，用于通过所述第一呼叫业务通信链路向所述终端下发组呼用户数据；
第四下发子单元，用于通过所述第二呼叫业务通信链路向所述终端下发组呼用户数据，以使所述终端对通过第一呼叫业务通信链路和第二呼叫业务通信链路接收到的组呼用户数据进行去重及合并操作。
优选的，所述通信单元包括：
第二接入子单元，用于在目标接入网络上将所述终端接入组呼；
第二回收子单元，用于回收所述终端的第三话权，所述第三话权为所述终端使用所述源接入网络时，向所述终端授予的组呼话权；
第二授予子单元，用于向所述终端授予第四话权，以使所述终端使用所述第二呼叫业务通信链路上传组呼用户数据。
优选的，还包括：
注销单元，用于注销所述第一注册信息。
一种终端，用于发送携带有切换指示的第二注册信息至融合核心网一端。
一种融合核心网服务器，用于接收终端发送的携带有切换指示的第二注册信息，及从所述第二注册信息中解析出所述切换指示，并根据所述第二注册信息和解析得到的所述切换指示，在目标接入网络上建立第二呼叫业务通信链路，及通过第一呼叫业务通信链路和所述第二呼叫业务通信链路与所述终端进行通信，所述第一呼叫业务通信链路为融合核心网在源接入网络上建立的链路，及释放第一呼叫业务通信链路。
与现有技术相比，本申请的有益效果为：
在本申请中，在终端请求从源接入网络切换至目标接入网络时，融合核心网在保持第一呼叫业务通信链路连接的前提下，接收携带有切换指示的第二注册信息，从所述第二注册信息中解析出所述切换指示，根据解析得到的切换指示同时保持第一注册信息和第二注册信息，并根据所述第二注册信息，在目标接入网络上建立第二呼叫业务通信链路，并通过第二呼叫业务通信链路和第一呼叫业务通信链路与终端进行通信，在通过第二呼叫业务通信链路与终端进行通信之后，才释放第一呼叫业务通信链路。由于在第一呼叫业务通信链路断开时，终端已经与目标接入网络建立连接，因此终端从源接入网络切换至目标接入网络的过程中呼叫业务没有被中断，保持了呼叫业务的连续性，从而改善了用户体验性。
附图说明
为了更清楚地说明本申请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单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，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是本申请提供的终端的呼叫业务切换方法的一种流程图；
图2是本申请提供的终端的呼叫业务切换方法的一种子流程图；
图3是本申请提供的终端的呼叫业务切换方法的另一种子流程图；
图4是本申请提供的终端的呼叫业务切换方法的再一种子流程图；
图5是本申请提供的终端的呼叫业务切换方法的另一种流程图；
图6是本申请提供的终端的呼叫业务切换方法的再一种流程图；
图7是本申请提供的终端的呼叫业务切换方法的再一种流程图；
图8是本申请提供的终端的呼叫业务切换方法的再一种流程图；
图9本申请提供的终端的呼叫业务切换方法的另一种流程图；
图10是本申请提供的终端的呼叫业务切换装置的一种逻辑结构示意图。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，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他实施例，都属于本申请保护的范围。
实施例一
在本实施例中，提供了一种终端的呼叫业务切换方法，应用于融合核心网一端。
请参见图1，其示出了本申请提供的终端的呼叫业务切换方法的一种流程图，可以包括以下步骤：
步骤S11：接收终端发送的携带有切换指示的第二注册信息。
终端在请求从源接入网络切换至目标接入网络时，会发送携带有切换指示的第二注册信息至融合核心网一端。
在本实施例中，源接入网络具体可以为LTE网络，相应的目标接入网络为Wi-Fi；或，源接入网络具体为Wi-Fi，相应的目标接入网络为LTE网络。
在本实施例中，对现有标准中注册消息进行扩展，使其新增切换指示，以告知融合核心网终端需要进行网络切换。由于注册消息中携带了切换指示，因此终端不再需要单独发送切换请求消息，相比于现有技术中在进行网络切换时既需要发送注册消息又发送切换请求消息的切换流程，减少了切换流程，提高了切换效率。
步骤S12：从所述第二注册信息中解析出所述切换指示，根据解析得到的切换指示同时保持第一注册信息和第二注册信息，并根据所述第二注册信息，在目标接入网络上建立第二呼叫业务通信链路。
所述第一注册信息为所述终端通过所述源接入网络通信的注册信息。
在本实施例中，在从第二注册信息中解析出切换指示后，不覆盖第一注册信息，同时保持第一注册信息和第二注册信息，为保持第一呼叫业务通信链路和第二呼叫业务通信链路的连接提供基础。
其中，第一注册信息为终端通过源接入网络通信的注册信息。第一呼叫业务通信链路为所述融合核心网在源接入网络上建立的链路。
在本实施例中，根据所述第二注册信息，在目标接入网络上建立第二呼叫业务通信链路的过程与现有技术中根据注册信息，建立通信链路的过程相同，在此不再赘述。
步骤S13：通过第一呼叫业务通信链路和所述第二呼叫业务通信链路与所述终端进行通信。
在本实施例中，通过所述第二呼叫业务通信链路与所述终端进行通信的同时，第一呼叫业务通信链路尚未被释放，融合核心网同时通过第一呼叫业务通信链路和第二呼叫业务通信链路与终端进行通信。在确认能够通过第二呼叫业务通信链路与终端进行通信，即确认终端切换至目标接入网络后，执行步骤S14。
步骤S14：释放第一呼叫业务通信链路。
在本实施例中，融合核心网在通过第二呼叫业务通信链路与所述终端进行通信后，释放第一呼叫业务通信链路，保证从源接入网络到目标接入网络的平滑切换。
在本申请中，在终端请求从源接入网络切换至目标接入网络时，融合核心网在保持第一呼叫业务通信链路连接的前提下，接收携带有切换指示 的第二注册信息，从所述第二注册信息中解析出所述切换指示，根据解析得到的切换指示同时保持第一注册信息和第二注册信息，并根据所述第二注册信息，在目标接入网络上建立第二呼叫业务通信链路，并通过第二呼叫业务通信链路和第一呼叫业务通信链路与终端进行通信，在通过第二呼叫业务通信链路与终端进行通信之后，才释放第一呼叫业务通信链路。由于在第一呼叫业务通信链路断开时，终端已经与目标接入网络建立连接，因此终端从源接入网络切换至目标接入网络的过程中呼叫业务没有被中断，保持了呼叫业务的连续性，从而改善了用户体验性。
进一步的，在释放第一呼叫业务通信链路之前，有两条呼叫业务通信链路(即第一呼叫业务通信链路和第二呼叫业务通信链路)与终端进行通信，相比于单条业务通信链路，可以提高语音数据接收的成功率，从而可以提高通话质量。
在本实施例中，在所述终端的呼叫业务为单呼被叫时，通过第一呼叫业务通信链路和所述第二呼叫业务通信链路与所述终端进行通信的过程具体为：
通过所述第一呼叫业务通信链路向所述终端下发单呼用户数据；
通过所述第二呼叫业务通信链路向所述终端下发单呼用户数据，以使所述终端对通过第一呼叫业务通信链路和第二呼叫业务通信链路接收到的单呼用户数据进行去重及合并操作。
其中，进行去重及合并操作的目的是提高通话质量。
由于终端尚未与源接入网络断开，因此在通过所述第二呼叫业务通信链路向所述终端下发单呼用户数据的同时，通过第一呼叫业务通信链路向终端下发单呼用户数据，因此终端接收到两份单呼用户数据，相应的，终端需要进行去重及合并操作。
其中，当终端在第一呼叫业务通信链路和第二呼叫业务通信链路上收到相同的单呼用户数据时，终端进行去重操作(即去掉重复的单呼用户数据)。当第一呼叫业务通信链路和第二呼叫业务通信链路中某一条链路上的单呼用户数据在另一条链路上不存在时，终端则可以进行合并操作(即将两条链路的单呼用户数据进行合并)。
在本实施例中，在所述终端的呼叫业务为单呼主叫时，通过第一呼叫业务通信链路和所述第二呼叫业务通信链路与所述终端进行通信的过程请参见 图2，可以包括以下步骤：
步骤S21：回收所述终端的第一话权。
在本实施例中，所述第一话权为所述终端使用所述源接入网络时，向所述终端授予的单呼话权。
步骤S22：向所述终端授予第二话权，以使所述终端使用所述第二呼叫业务通信链路上传单呼用户数据。
终端在被授予第二话权后，终端使用第二呼叫业务通信链路上传单呼用户数据。
在本实施例中，在所述终端的呼叫业务为组呼被叫时，通过所述第二呼叫业务通信链路和第一呼叫业务通信链路与所述终端进行通信的过程请参见图3，可以包括以下步骤：
步骤S31：在目标接入网络上将所述终端接入组呼。
在切换至目标接入网络之前，终端已在源接入网络上接入组呼。
步骤S32：通过所述第一呼叫业务通信链路向所述终端下发组呼用户数据。
步骤S33：通过所述第二呼叫业务通信链路向所述终端下发组呼用户数据，以使所述终端对通过第一呼叫业务通信链路和第二呼叫业务通信链路接收到的组呼用户数据进行去重及合并操作。
在本实施例中，由于终端尚未与源接入网络断开，因此在通过所述第二呼叫业务通信链路向所述终端下发组呼用户数据的同时，通过第一呼叫业务通信链路向终端下发组呼用户数据，因此终端接收到两份组呼用户数据，相应的，终端需要进行去重及合并操作。
其中，当终端在第一呼叫业务通信链路和第二呼叫业务通信链路上收到相同的组呼用户数据时，终端进行去重操作(即去掉重复的组呼用户数据)。当第一呼叫业务通信链路和第二呼叫业务通信链路中某一条链路上的组呼用户数据在另一条链路上不存在时，终端则可以进行合并操作(即将两条链路的组呼用户数据进行合并)。
在本实施例中，在所述终端的呼叫业务为组呼主叫时，通过第一呼叫业务通信链路和所述第二呼叫业务通信链路与所述终端进行通信的过程请参见图4，可以包括以下步骤：
步骤S41：在目标接入网络上将所述终端接入组呼。
在切换至目标接入网络之前，终端已在源接入网络上接入组呼。
步骤S42：回收所述终端的第三话权。
上述第三话权为所述终端使用所述源接入网络时，向所述终端授予的组呼话权。
步骤S43：向所述终端授予第四话权，以使所述终端使用所述第二呼叫业务通信链路上传组呼用户数据。
在本实施例中，现举例分别对在所述终端的呼叫业务为单呼被叫时、在所述终端的呼叫业务为单呼主叫时、在所述终端的呼叫业务为组呼被叫时和在所述终端的呼叫业务为组呼主叫时的终端的呼叫业务切换方法进行说明，具体如下：
例一：在本例中对在所述终端的呼叫业务为单呼被叫时，终端的呼叫业务切换方法进行说明，请参见图5。在本例中，终端需要从LET网络切换到WiFi网络。图5中的UE表示终端，eMME、TCF和TMF为融合核心网中的网元，TCF负责与终端进行信令交互，TMF负责与终端进行用户数据交互。
图5中消息1～4通过注册信息中携带切换指示来表示终端需要在网络间进行切换；消息5～8表示融合核心网在新的网络(即WiFi网络)上新建链路；之后融合核心网可以在新的链路上下发用户数据，终端侧在两条链路(LET网络上的原有链路和WiFi网络上新建的链路)均收到用户数据，通过去重及合并操作，保持业务连续；消息9～12释放旧的网络连接(即释放LET网络连接)，步骤13～16注销旧的用户注册信息(即注销LET网络注册信息)，完成切换过程。
步骤1-4：1、UE发送SIP(REGISTER)HO indication至TCF，SIP(REGISTER)HO indication表示通过SIP协议的REGISTER携带切换指示(即HO indication)；2、TCF返回SIP(401 Unauthorized)至UE；3、UE发送SIP(REGISTER)HO indication至TCF，TCF对携带HO指示的终端进行注册，不覆盖已有的LTE注册信息；4、TCF返回SIP(200OK)至UE，并进行FORK呼叫(即对UE再进行一次呼叫)。
其中，第2步中401 Unauthorized表示鉴权未通过，因此UE在接收到TCF 返回的SIP(401 Unauthorized)之后，重新发送SIP(REGISTER)HO indication至TCF，即执行第3步。
步骤5-8：5、TCF发送SIP(INVITE)至UE，邀请UE加入到WiFi网络；6、终端返回SIP(100 Trying)至TCF；7、终端返回SIP(200OK)至TCF；8、TCF返回SIP(ACK)，表示呼叫会话建立完成，并通知TMF建立UDP媒体通道(即建立第二呼叫业务通信链路)。TMF在建立UDP媒体通道后，向UE下发Media(即用户数据)，由于UE同时接收到第一呼叫业务通信链路和第二呼叫业务通信链路下发的用户数据，因此UE进行去重及合并操作。
步骤9-12：9、TCF发送SIP(BYE)消息至eMME；10、由eMME将SIP(BYE)消息转换为UE可以识别的CALL RELEASE REQUEST消息，并发送至UE；11、UE返回CALL RELEASE RESPONSE消息至eMME；12、eMME将CALL RELEASE RESPONSE消息转换为SIP(200OK)消息，并发送至TCF。TCF则通知TMF释放LET侧承载(即通知TMF释放第一呼叫业务通信链路)。
步骤13-16：TCF在TMF释放第一呼叫业务通信链路后，注销LTE注册信息。13、TCF发送SIP(Options)至eMME；14、eMME将SIP(Options)转换为UE可以识别的TRUNKING DEREGISTER REQUEST，并发送至UE；
15、UE返回TRUNKING DEREGISTER ACCEPT至eMME；16、eMME将TRUNKING DEREGISTER ACCEPT转换为SIP(200OK)，并发送至TCF，完成切换过程。
例二：在本例中对在所述终端的呼叫业务为单呼主叫时，终端的呼叫业务切换方法进行说明，请参见图6。在本例中，终端需要从LET网络切换到WiFi网络。图6中的UE表示终端，eMME、TCF和TMF为融合核心网中的网元，TCF负责与终端进行信令交互，TMF负责与终端进行用户数据交互。
图6中消息1～4通过注册信息中携带切换指示来表示终端需要在网络间进行切换；消息5～8表示融合核心网在新的网络(即WiFi网络)上新建链路；之后对于半双工单呼，融合核心网回收旧网络话权(即LTE网络话权)，授予新网络话权(即WiFi网络话权)，然后终端使用新链路上传用户数据；消息9～12释放旧的网络连接(即释放LET网络连接)，步骤13～16注销旧的用户注册信息(即注销LET网络注册信息)，完成切换过程。
步骤1-4：1、UE发送SIP(REGISTER)HO indication至TCF， SIP(REGISTER)HO indication表示通过SIP协议的REGISTER携带切换指示(即HO indication)；2、TCF返回SIP(401 Unauthorized)至UE；3、UE发送SIP(REGISTER)HO indication至TCF，TCF对携带HO指示的终端进行注册，不覆盖已有的LTE注册信息；4、TCF返回SIP(200OK)至UE，并进行FORK呼叫(即对UE再进行一次呼叫)。
步骤5-8：5、TCF发送SIP(INVITE)至UE，邀请UE加入到WiFi网络；6、终端返回SIP(100Trying)至TCF；7、终端返回SIP(200OK)至TCF；8、TCF返回SIP(ACK)，表示呼叫会话建立完成，并通知TMF建立UDP媒体通道(即建立第二呼叫业务通信链路)。TMF在建立UDP媒体通道后，向UE授予新网络话权，回收旧网络话权。UE在被授予新网络话权后，从旧网络话权切换至新网络话权过程中，缓存部分语音数据，以在第二呼叫业务通信链路上上传缓存的部分语音数据。UE向TMF发送Media(包含缓存的部分语音数据。
步骤9-12：9、TCF发送SIP(BYE)消息至eMME；10、由eMME将SIP(BYE)消息转换为UE可以识别的CALL RELEASE REQUEST消息，并发送至UE；11、UE返回CALL RELEASE RESPONSE消息至eMME；12、eMME将CALL RELEASE RESPONSE消息转换为SIP(200OK)消息，并发送至TCF。TCF则通知TMF释放LET侧承载(即通知TMF释放第一呼叫业务通信链路)。
步骤13-16：TCF在TMF释放第一呼叫业务通信链路后，注销LTE注册信息。13、TCF发送SIP(Options)至eMME；14、eMME将SIP(Options)转换为UE可以识别的TRUNKING DEREGISTER REQUEST，并发送至UE；
15、UE返回TRUNKING DEREGISTER ACCEPT至eMME；16、eMME将TRUNKING DEREGISTER ACCEPT转换为SIP(200OK)，并发送至TCF，完成切换过程。
例三：在本例中对在所述终端的呼叫业务为组呼被叫时，终端的呼叫业务切换方法进行说明，请参见图7。在本例中，终端需要从LET网络切换到WiFi网络。图7中的UE表示终端，eMME、TCF和TMF为融合核心网中的网元，TCF负责与终端进行信令交互，TMF负责与终端进行用户数据交互。
图7中消息1～4通过注册信息中携带切换指示来表示终端需要在网络间进行切换；消息5～8表示融合核心网在新的网络(即WiFi网络)上新建链路并 在WiFi网络上将终端接入组呼；之后融合核心网可以在新的链路上下发用户数据，终端侧在两条链路(LET网络上的原有链路和WiFi网络上新建的链路)均收到用户数据，通过去重及合并操作，保持业务连续；消息9～12释放旧的网络连接(即释放LET网络连接)，步骤13～16注销旧的用户注册信息(即注销LET网络注册信息)，完成切换过程。
步骤1-4：1、UE发送SIP(REGISTER)HO indication至TCF，SIP(REGISTER)HO indication表示通过SIP协议的REGISTER携带切换指示(即HO indication)；2、TCF返回SIP(401 Unauthorized)至UE；3、UE发送SIP(REGISTER)HO indication至TCF，TCF对携带HO指示的终端进行注册，不覆盖已有的LTE注册信息；4、TCF返回SIP(200OK)至UE，并在WiFi网络上将终端接入组呼。
步骤5-8：5、TCF发送SIP(INVITE)至UE，邀请UE加入到WiFi网络；6、终端返回SIP(100 Trying)至TCF；7、终端返回SIP(200OK)至TCF；8、TCF返回SIP(ACK)，表示呼叫会话建立完成，并通知TMF建立UDP媒体通道(即建立第二呼叫业务通信链路)。TMF在建立UDP媒体通道后，向UE下发Media(即用户数据)，由于UE同时接收到第一呼叫业务通信链路和第二呼叫业务通信链路下发的用户数据，因此UE进行去重及合并操作。
步骤9-12：9、TCF发送SIP(BYE)消息至eMME；10、由eMME将SIP(BYE)消息转换为UE可以识别的CALL RELEASE REQUEST消息，并发送至UE；11、UE返回CALL RELEASE RESPONSE消息至eMME；12、eMME将CALL RELEASE RESPONSE消息转换为SIP(200OK)消息，并发送至TCF。TCF则通知TMF释放LET侧承载(即通知TMF释放第一呼叫业务通信链路)。
步骤13-16：TCF在TMF释放第一呼叫业务通信链路后，注销LTE注册信息。13、TCF发送SIP(Options)至eMME；14、eMME将SIP(Options)转换为UE可以识别的TRUNKING DEREGISTER REQUEST，并发送至UE；
15、UE返回TRUNKING DEREGISTER ACCEPT至eMME；16、eMME将TRUNKING DEREGISTER ACCEPT转换为SIP(200OK)，并发送至TCF，完成切换过程。
例四：在本例中对在所述终端的呼叫业务为组呼主叫时，终端的呼叫业务切换方法进行说明，请参见图8。在本例中，终端需要从LET网络切换到WiFi 网络。图8中的UE表示终端，eMME、TCF和TMF为融合核心网中的网元，TCF负责与终端进行信令交互，TMF负责与终端进行用户数据交互。
图8中消息1～4通过注册信息中携带切换指示来表示终端需要在网络间进行切换；消息5～8表示融合核心网在新的网络(即WiFi网络)上新建链路在WiFi网络上将终端接入组呼；之后融合核心网回收旧网络话权(即LTE网络话权)，授予新网络话权(即WiFi网络话权)，然后终端使用新链路上传用户数据；消息9～12释放旧的网络连接(即释放LET网络连接)，步骤13～16注销旧的用户注册信息(即注销LET网络注册信息)，完成切换过程。
步骤1-4：1、UE发送SIP(REGISTER)HO indication至TCF，SIP(REGISTER)HO indication表示通过SIP协议的REGISTER携带切换指示(即HO indication)；2、TCF返回SIP(401 Unauthorized)至UE；3、UE发送SIP(REGISTER)HO indication至TCF，TCF对携带HO指示的终端进行注册，不覆盖已有的LTE注册信息；4、TCF返回SIP(200OK)至UE，并在WiFi网络上将终端接入组呼。
步骤5-8：5、TCF发送SIP(INVITE)至UE，邀请UE加入到WiFi网络；6、终端返回SIP(100 Trying)至TCF；7、终端返回SIP(200OK)至TCF；8、TCF返回SIP(ACK)，表示呼叫会话建立完成，并通知TMF建立UDP媒体通道(即建立第二呼叫业务通信链路)。TMF在建立UDP媒体通道后，向UE授予新网络话权，回收旧网络话权。UE在被授予新网络话权后，从旧网络话权切换至新网络话权过程中，缓存部分语音数据，以在第二呼叫业务通信链路上上传缓存的部分语音数据。UE向TMF发送Media(包含缓存的部分语音数据。
步骤9-12：9、TCF发送SIP(BYE)消息至eMME；10、由eMME将SIP(BYE)消息转换为UE可以识别的CALL RELEASE REQUEST消息，并发送至UE；11、UE返回CALL RELEASE RESPONSE消息至eMME；12、eMME将CALL RELEASE RESPONSE消息转换为SIP(200OK)消息，并发送至TCF。TCF则通知TMF释放LET侧承载(即通知TMF释放第一呼叫业务通信链路)。
步骤13-16：TCF在TMF释放第一呼叫业务通信链路后，注销LTE注册信息。13、TCF发送SIP(Options)至eMME；14、eMME将SIP(Options)转换为UE可以识别的TRUNKING DEREGISTER REQUEST，并发送至UE；
15、UE返回TRUNKING DEREGISTER ACCEPT至eMME；16、eMME 将TRUNKING DEREGISTER ACCEPT转换为SIP(200OK)，并发送至TCF，完成切换过程。
需要说明的是，在所述终端的呼叫业务为单呼被叫，由WiFi网络切换到LET网络时，终端的呼叫业务切换方法的具体实例的原理与例一相同，在此不再赘述；在所述终端的呼叫业务为单呼主叫，由WiFi网络切换到LET网络时，终端的呼叫业务切换方法的具体实例的原理与例二相同，在此不再赘述；在所述终端的呼叫业务为组呼被叫，由WiFi网络切换到LET网络时，终端的呼叫业务切换方法的具体实例的原理与例三相同，在此不再赘述；在所述终端的呼叫业务为组呼主叫，由WiFi网络切换到LET网络时，终端的呼叫业务切换方法的具体实例的原理与例四相同，在此不再赘述。
在本实施例中，在图1示出的终端的呼叫业务切换方法的基础上扩展出另外一种终端的呼叫业务切换方法，请参见图9，还包括以下步骤：
步骤S15：注销所述第一注册信息。
在本实施例中，注销所述第一注册信息，以减少内存占用。
实施例二
与上述方法实施例相对应，本实施例提供了一种终端的呼叫业务切换装置，请参见图10，终端的呼叫业务切换装置包括：接收单元101、建立单元102、通信单元103和释放单元104。
接收单元101，用于接收终端在请求从源接入网络切换至目标接入网络时发送的携带有切换指示的第二注册信息。
建立单元102，用于从所述第二注册信息中解析出所述切换指示，根据解析得到的切换指示同时保持第一注册信息和第二注册信息，并根据所述第二注册信息，在目标接入网络上建立第二呼叫业务通信链路，所述第一注册信息为所述终端通过所述源接入网络通信的注册信息。
通信单元103，用于通过第一呼叫业务通信链路和所述第二呼叫业务通信链路与所述终端进行通信，所述第一呼叫业务通信链路为融合核心网在源接入网络上建立的链路。
释放单元104，用于释放第一呼叫业务通信链路。
在本实施例中，通信单元103具体可以包括：第一下发子单元和第二下 发子单元。
第一下发子单元，用于通过所述第一呼叫业务通信链路向所述终端下发单呼用户数据
第二下发子单元，用于通过所述第二呼叫业务通信链路向所述终端下发单呼用户数据，以使所述终端对通过第一呼叫业务通信链路和第二呼叫业务通信链路接收到的单呼用户数据进行去重及合并操作。
在本实施例中，在终端的呼叫业务为单呼被叫时，执行第一下发子单元和第二下发子单元。
在本实施例中，通信单元103具体可以包括：第一回收子单元和第一授予子单元。
第一回收子单元，用于回收所述终端的第一话权，所述第一话权为所述终端使用所述源接入网络时，向所述终端授予的单呼话权。
第一授予子单元，用于向所述终端授予第二话权，以使所述终端使用所述第二呼叫业务通信链路上传单呼用户数据。
在本实施例中，在所述终端的呼叫业务为单呼主叫时，执行第一回收子单元和第一授予子单元。
在本实施例中，通信单元103具体可以包括：第一接入子单元、第三下发子单元和第四下发子单元。
第一接入子单元，用于在目标接入网络上将所述终端接入组呼。
第三下发子单元，用于通过所述第一呼叫业务通信链路向所述终端下发组呼用户数据。
第四下发子单元，用于通过所述第二呼叫业务通信链路向所述终端下发组呼用户数据，以使所述终端对通过第一呼叫业务通信链路和第二呼叫业务通信链路接收到的组呼用户数据进行去重及合并操作。
在本实施例中，在所述终端的呼叫业务为组呼被叫时，执行第一接入子单元和第二下发子单元。
在本实施例中，通信单元103具体可以包括：第二接入子单元、第二回收子单元和第二授予子单元。
第二接入子单元，用于在目标接入网络上将所述终端接入组呼。
第二回收子单元，用于回收所述终端的第三话权，所述第三话权为所述终 端使用所述源接入网络时，向所述终端授予的组呼话权。
第二授予子单元，用于向所述终端授予第四话权，以使所述终端使用所述第二呼叫业务通信链路上传组呼用户数据。
在本实施例中，在所述终端的呼叫业务为组呼主叫时，执行第二接入子单元、第二回收子单元和第二授予子单元。
在本实施例中，图10示出的终端的呼叫业务切换装置还可以包括：注销单元，用于注销所述第一注册信息。
在本实施例中，提供了一种终端，用于发送携带有切换指示的第二注册信息至融合核心网一端。
在本实施例中，同时提供了一种融合核心网服务器，用于接收终端发送的携带有切换指示的第二注册信息，及从所述第二注册信息中解析出所述切换指示，并根据所述第二注册信息和解析得到的所述切换指示，在目标接入网络上建立第二呼叫业务通信链路，及通过第一呼叫业务通信链路和所述第二呼叫业务通信链路与所述终端进行通信，所述第一呼叫业务通信链路为融合核心网在源接入网络上建立的链路，及释放第一呼叫业务通信链路。
需要说明的是，本说明书中的各个实施例均采用递进的方式描述，每个实施例重点说明的都是与其他实施例的不同之处，各个实施例之间相同相似的部分互相参见即可。对于装置类实施例而言，由于其与方法实施例基本相似，所以描述的比较简单，相关之处参见方法实施例的部分说明即可。
最后，还需要说明的是，在本文中，诸如第一和第二等之类的关系术语仅仅用来将一个实体或者操作与另一个实体或操作区分开来，而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。而且，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者设备不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者设备所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括所述要素的过程、方法、物品或者设备中还存在另外的相同要素。
以上对本申请所提供的一种终端的呼叫业务切换方法及装置进行了详 细介绍，本文中应用了具体个例对本申请的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本申请的方法及其核心思想；同时，对于本领域的一般技术人员，依据本申请的思想，在具体实施方式及应用范围上均会有改变之处，综上所述，本说明书内容不应理解为对本申请的限制。

Claims (14)

  1. 一种终端的呼叫业务切换方法，其特征在于，包括：
    接收终端发送的携带有切换指示的第二注册信息；
    从所述第二注册信息中解析出所述切换指示，根据解析得到的切换指示同时保持第一注册信息和第二注册信息，并根据所述第二注册信息，在目标接入网络上建立第二呼叫业务通信链路，所述第一注册信息为所述终端通过所述源接入网络通信的注册信息；
    通过第一呼叫业务通信链路和所述第二呼叫业务通信链路与所述终端进行通信，所述第一呼叫业务通信链路为融合核心网在源接入网络上建立的链路；
    释放第一呼叫业务通信链路。
  2. 根据权利要求1所述的方法，其特征在于，在所述终端的呼叫业务为单呼被叫时，通过第一呼叫业务通信链路和所述第二呼叫业务通信链路与所述终端进行通信的过程，包括：
    通过所述第一呼叫业务通信链路向所述终端下发单呼用户数据；
    通过所述第二呼叫业务通信链路向所述终端下发单呼用户数据，以使所述终端对通过第一呼叫业务通信链路和第二呼叫业务通信链路接收到的单呼用户数据进行去重及合并操作。
  3. 根据权利要求1所述的方法，其特征在于，在所述终端的呼叫业务为单呼主叫时，通过第一呼叫业务通信链路和所述第二呼叫业务通信链路与所述终端进行通信的过程，包括：
    回收所述终端的第一话权，所述第一话权为所述终端使用所述源接入网络时，向所述终端授予的单呼话权；
    向所述终端授予第二话权，以使所述终端使用所述第二呼叫业务通信链路上传单呼用户数据。
  4. 根据权利要求1所述的方法，其特征在于，在所述终端的呼叫业务为组呼被叫时，通过第一呼叫业务通信链路和所述第二呼叫业务通信链路与所述终端进行通信的过程，包括：
    在目标接入网络上将所述终端接入组呼；
    通过所述第一呼叫业务通信链路向所述终端下发组呼用户数据；
    通过所述第二呼叫业务通信链路向所述终端下发组呼用户数据，以使所述终端对通过第一呼叫业务通信链路和第二呼叫业务通信链路接收到的组呼用户数据进行去重及合并操作。
  5. 根据权利要求1所述的方法，其特征在于，在所述终端的呼叫业务为组呼主叫时，通过第一呼叫业务通信链路和所述第二呼叫业务通信链路与所述终端进行通信的过程，包括：
    在目标接入网络上将所述终端接入组呼；
    回收所述终端的第三话权，所述第三话权为所述终端使用所述源接入网络时，向所述终端授予的组呼话权；
    向所述终端授予第四话权，以使所述终端使用所述第二呼叫业务通信链路上传组呼用户数据。
  6. 根据权利要求1所述的方法，其特征在于，所述释放第一呼叫业务通信链路之后，还包括：
    注销所述第一注册信息。
  7. 一种终端的呼叫业务切换装置，其特征在于，包括：
    接收单元，用于接收终端发送的携带有切换指示的第二注册信息；
    建立单元，用于从所述第二注册信息中解析出所述切换指示，根据解析得到的切换指示同时保持第一注册信息和第二注册信息，并根据所述第二注册信息，在目标接入网络上建立第二呼叫业务通信链路，所述第一注册信息为所述终端通过所述源接入网络通信的注册信息；
    通信单元，用于通过第一呼叫业务通信链路和所述第二呼叫业务通信链路与所述终端进行通信，所述第一呼叫业务通信链路为融合核心网在源接入网络上建立的链路；
    释放单元，用于释放第一呼叫业务通信链路。
  8. 根据权利要求7所述的装置，其特征在于，所述通信单元包括：
    第一下发子单元，用于通过所述第一呼叫业务通信链路向所述终端下发单呼用户数据；
    第二下发子单元，用于通过所述第二呼叫业务通信链路向所述终端下发单呼用户数据，以使所述终端对通过第一呼叫业务通信链路和第二呼叫业务通信链路接收到的单呼用户数据进行去重及合并操作。
  9. 根据权利要求7所述的装置，其特征在于，所述通信单元包括：
    第一回收子单元，用于回收所述终端的第一话权，所述第一话权为所述终端使用所述源接入网络时，向所述终端授予的单呼话权；
    第一授予子单元，用于向所述终端授予第二话权，以使所述终端使用所述第二呼叫业务通信链路上传单呼用户数据。
  10. 根据权利要求7所述的装置，其特征在于，所述通信单元包括：
    第一接入子单元，用于在目标接入网络上将所述终端接入组呼；
    第三下发子单元，用于通过所述第一呼叫业务通信链路向所述终端下发组呼用户数据；
    第四下发子单元，用于通过所述第二呼叫业务通信链路向所述终端下发组呼用户数据，以使所述终端对通过第一呼叫业务通信链路和第二呼叫业务通信链路接收到的组呼用户数据进行去重及合并操作。
  11. 根据权利要求7所述的装置，其特征在于，所述通信单元包括：
    第二接入子单元，用于在目标接入网络上将所述终端接入组呼；
    第二回收子单元，用于回收所述终端的第三话权，所述第三话权为所述终端使用所述源接入网络时，向所述终端授予的组呼话权；
    第二授予子单元，用于向所述终端授予第四话权，以使所述终端使用所述第二呼叫业务通信链路上传组呼用户数据。
  12. 根据权利要求7所述的装置，其特征在于，还包括：
    注销单元，用于注销所述第一注册信息。
  13. 一种终端，其特征在于，用于发送携带有切换指示的第二注册信息至融合核心网一端。
  14. 一种融合核心网服务器，其特征在于，用于接收终端发送的携带有切换指示的第二注册信息，及从所述第二注册信息中解析出所述切换指示，并根据所述第二注册信息和解析得到的所述切换指示，在目标接入网络上建立第二呼叫业务通信链路，及通过第一呼叫业务通信链路和所述第二呼叫业务通信链路与所述终端进行通信，所述第一呼叫业务通信链路为融合核心网在源接入网络上建立的链路，及释放第一呼叫业务通信链路。
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