CN111064696B - Information transmission method and device - Google Patents

Information transmission method and device Download PDF

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Publication number
CN111064696B
CN111064696B CN201811209590.3A CN201811209590A CN111064696B CN 111064696 B CN111064696 B CN 111064696B CN 201811209590 A CN201811209590 A CN 201811209590A CN 111064696 B CN111064696 B CN 111064696B
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terminal
network side
eps fallback
flow
side equipment
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CN111064696A (en
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孙冰洁
陈贤亮
何毅
徐富荣
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Spreadtrum Communications Shanghai Co Ltd
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Spreadtrum Communications Shanghai Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1101—Session protocols
    • H04L65/1104—Session initiation protocol [SIP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/1016—IP multimedia subsystem [IMS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/14—Session management
    • H04L67/141—Setup of application sessions

Abstract

The invention provides an information transmission method and device. The method comprises the following steps: when detecting that an IP Multimedia Subsystem (IMS) call is to be established, a network side device sends indication information to a terminal, wherein the indication information is used for indicating the network side device to execute an EPS fallback flow; and the network side equipment executes a Session Initiation Protocol (SIP) signaling interaction flow and an EPS fallback flow according to a preset sequence. By adopting the scheme, the network side equipment timely informs the terminal that the EPS fallback service is to be executed currently, executes the SIP signaling interaction flow and the EPS fallback flow according to the preset sequence, and the terminal is correspondingly matched to ensure that the execution time of the two flows is not conflicted, so that the problem of SIP signaling transmission failure caused by the initiation of the EPS fallback in the related technology is solved, the user time is saved, and the establishment efficiency of the IMS call is improved.

Description

Information transmission method and device
Technical Field
The present invention relates to the field of communications technologies, and in particular, to an information transmission method and apparatus.
Background
In the related art, if a Session Initiation Protocol (SIP) signaling fails to be sent, a terminal may perform retransmission according to a certain rule according to a transmission type used by the SIP signaling, so as to improve a sending success rate. For example, if the SIP signaling is sent using UDP, when the SIP signaling fails to be sent, the terminal will retransmit the SIP signaling according to the rule of 2s, 4s, 8s, and 16s until receiving the response from the opposite end to the SIP signaling.
In the 5G system in the related art, when an IMS voice call is to be initiated, if the network does not support the provision of the voice service on the 5G NR, but the terminal needs to be switched to the LTE through the EPS fallback procedure, and the voice service can be provided only through the LTE, then in the switching procedure, the SIP signaling may be failed to be sent, thereby affecting the successful establishment of the IMS voice call.
When the network initiates the EPS fallback, generally, the IMS voice call is in the stage of being established, if the SIP signaling is failed to be sent, the terminal retransmits the SIP signaling according to the rule of 2s, 4s, 8s, and 16s, which inevitably causes a long time for establishing the IMS voice call and also increases the probability of failure in establishing the IMS voice call.
For the problem of failure of SIP signaling transmission when initiating EPS fallback in the related art, no effective solution exists at present.
Disclosure of Invention
The information transmission method and the information transmission device provided by the invention can solve the problem of SIP signaling transmission failure caused by initiating EPS fallback in the related technology.
In a first aspect, the present invention provides an information transmission method, including: when detecting that an IP Multimedia Subsystem (IMS) call is to be established, a network side device sends indication information to a terminal, where the indication information is used to indicate that the network side device is to execute an EPS fallback procedure; and the network side equipment executes the SIP signaling interaction flow and the EPS fallback flow according to the preset sequence.
Optionally, the preset sequence includes one of: the first sequence comprises that the network side equipment executes EPS fallback firstly and then executes SIP signaling interaction flow; and the second sequence comprises that the network side equipment firstly executes the SIP signaling interaction flow and then executes the EPS fallback.
Optionally, the network side device executes an SIP signaling interaction flow and an EPS fallback flow according to a preset sequence, where the SIP signaling interaction flow and the EPS fallback flow include one of the following flows: when the preset sequence is the first sequence, after receiving a 183 response transmitted by a terminal MT, the network side sends a request for instructing to stop establishing the current IMS call to the terminal MT and a terminal MO, and the network side device executes the EPS fallback procedure; and when the preset sequence is the second sequence, after the network side receives 183 responses transmitted by the terminal MT, the information is forwarded between the terminal MT and the terminal MO, and the network side equipment executes an EPS fallback flow after forwarding a 200OK for PRACK response message to the terminal MO.
Optionally, sending, to the terminal MT and the terminal MO, an instruction to stop the establishment of the current IMS call includes: and sending an EPS fallback identifier and redialing timing to the terminal MO, wherein the redialing timing is used for redialing after timeout so as to establish an IMS (IP multimedia subsystem) conversation with the terminal MT.
Optionally, the scheme for sending redial timing to the terminal MO includes one of: informing the terminal MO of the time required for completing the EPS fallback flow, wherein the terminal determines the redialing time according to the required time; and carrying a Retry-After header field in the SIP message forwarded by the network side equipment, wherein the Retry-After header field carries the redialing timing.
Optionally, the method includes sending, to the terminal MT and the terminal MO, a request for instructing to stop establishing the current IMS call, and after the network side device executes the EPS fallback procedure, receiving a redial initiated by the terminal MO, where the terminal MO initiates the redial after a predetermined time after the terminal MO stops establishing the current IMS call, or initiates the redial when a change in an access network is detected.
Optionally, the forwarding information between the terminal MT and the terminal MO includes: and in the information forwarding process, sending an EPS fallback identifier to the terminal MT and the terminal MO, and indicating the network side equipment to wait for executing an EPS fallback flow.
Optionally, the sending the indication information to the terminal includes: and adding a header field in the SIP message, and carrying an EPS fallback identifier.
Optionally, when the network side device detects that an IMS call is to be established, before sending the indication information to the terminal, the network side device detects that the terminal MT and/or the terminal MO are/is in the 5G network.
In a second aspect, the present invention provides an information transmission method, including: the terminal MO sends request information to the terminal MT for establishing an IMS call; receiving indication information sent by a network side device, wherein the indication information is used for indicating the network side device to wait for executing an EPS fallback flow; and stopping establishing the IMS call, and initiating redialing for establishing the IMS call to the network side equipment when a preset condition is met.
Optionally, when a preset condition is met, initiating redialing to the network side device for establishing the IMS call, including: the terminal MO initiates the redialing after the preset time after the IMS call is stopped to be established; or, initiating the redial when a change in the access network is detected.
Optionally, the preset time is obtained by one of the following methods: receiving a notification message sent by the network side equipment, and notifying the completion of the time required by the network side equipment to complete an EPS fallback flow; and receiving the SIP message forwarded by the network side equipment, wherein the SIP message carries a Retry-After header domain, and the Retry-After header domain carries the preset time.
Optionally, receiving the indication information sent by the network side device includes: receiving EPS fallback identification carried in a header field added in the SIP message.
In a third aspect, the present invention provides an information transmission apparatus, comprising: the device comprises a first sending module and a second sending module, wherein the first sending module is used for sending indication information to a terminal when detecting that an IMS (IP multimedia subsystem) call is to be established, and the indication information is used for indicating the network side equipment to execute an EPS fallback flow; and the execution module is used for executing the SIP signaling interaction flow and the EPS fallback flow according to the preset sequence.
In a fourth aspect, the present invention provides an information transmission apparatus, comprising: a second sending module, configured to send request information to the terminal MT, where the request information is used to establish an IMS call; the device comprises a receiving module and a processing module, wherein the receiving module is used for receiving indication information sent by a network side device, and the indication information is used for indicating the network side device to wait for executing an EPS fallback flow; and the redialing module is used for stopping establishing the IMS call and initiating redialing for establishing the IMS call to the network side equipment when a preset condition is met.
According to the information transmission method and device provided by the embodiment of the invention, when detecting that an IP Multimedia Subsystem (IMS) call is to be established, network side equipment sends indication information to a terminal, wherein the indication information is used for indicating the network side equipment to execute an EPS fallback flow; and the network side equipment executes a Session Initiation Protocol (SIP) signaling interaction flow and an EPS fallback flow according to a preset sequence. By adopting the scheme, the network side equipment timely informs the terminal that the EPS fallback service is to be executed currently, executes the SIP signaling interaction flow and the EPS fallback flow according to the preset sequence, and the terminal is correspondingly matched to ensure that the execution time of the two flows is not conflicted, so that the problem of SIP signaling transmission failure caused by the initiation of the EPS fallback in the related technology is solved, the user time is saved, and the establishment efficiency of the IMS call is improved.
Drawings
Fig. 1 is a first flowchart illustrating an information transmission method according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of an information transmission method according to an embodiment of the present invention;
fig. 3 is a schematic signaling interaction flow diagram for establishing an IMS call according to the related art;
fig. 4 is a schematic flow chart of establishing an IMS call according to a first aspect of the present invention;
fig. 5 is a schematic flow chart of establishing an IMS call according to the first aspect of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
User Equipment, UE
MO: mobile Original, Mobile Caller
MT: mobile Terminated, Mobile called
IMS: IP multimedia subsystem, IP multimedia subsystem.
VoNR: voice over NR, 5G provides IMS Voice services.
EPS fallback: and instead of providing the voice service on the 5G NR, the network switches the terminal to the LTE (Long term evolution) network through a switching process, and provides the voice service through the LTE.
An embodiment of the present invention provides an information transmission method, and fig. 1 is a schematic flow chart of the information transmission method provided according to the embodiment of the present invention, as shown in fig. 1, the flow chart includes the following steps:
s11, when detecting that an IP multimedia subsystem call is to be established, the network side equipment sends indication information to the terminal, wherein the indication information is used for indicating the network side equipment to execute an EPS fallback flow;
and S12, the network side equipment executes the SIP signaling interaction flow and the EPS fallback flow according to the preset sequence.
By adopting the scheme, the network side equipment timely informs the terminal that the EPS fallback service is to be executed currently, executes the SIP signaling interaction flow and the EPS fallback flow according to the preset sequence, and the terminal is correspondingly matched to ensure that the execution time of the two flows is not conflicted, so that the problem of SIP signaling transmission failure caused by the initiation of the EPS fallback in the related technology is solved, the user time is saved, and the establishment efficiency of the IMS call is improved.
Optionally, the preset sequence includes one of: the first sequence comprises that the network side equipment executes EPS fallback firstly and then executes SIP signaling interaction flow; and the second sequence comprises that the network side equipment firstly executes the SIP signaling interaction flow and then executes the EPS fallback.
Optionally, the network side device executes an SIP signaling interaction flow and an EPS fallback flow according to a preset sequence, where the SIP signaling interaction flow and the EPS fallback flow include one of: when the preset sequence is the first sequence, after receiving a 183 response transmitted by a terminal MT, the network side sends a request for instructing to stop establishing the current IMS call to the terminal MT and a terminal MO, and the network side device executes the EPS fallback procedure; and when the preset sequence is the second sequence, after the network side receives 183 responses transmitted by the terminal MT, the information is forwarded between the terminal MT and the terminal MO, and the network side equipment executes an EPS fallback flow after forwarding a 200OK for PRACK response message to the terminal MO.
The 200OK for PRACK response message is SIP signaling.
Optionally, sending, to the terminal MT and the terminal MO, an instruction to stop establishing the current IMS call includes: and sending an EPS fallback identifier and a redialing timing to the terminal MO, wherein the redialing timing is used for redialing after the time is out, and establishing an IMS (IP multimedia subsystem) conversation with the terminal MT.
Optionally, the scheme for sending redial timing to the terminal MO includes one of: informing the terminal MO of the time required for completing the EPS fallback flow, wherein the terminal determines the redialing time according to the required time; and carrying a Retry-After header field in the SIP message forwarded by the network side equipment, wherein the Retry-After header field carries the redialing timing.
Optionally, the method includes sending, to the terminal MT and the terminal MO, a request for instructing to stop establishing the current IMS call, and after the network side device executes the EPS fallback procedure, receiving a redial initiated by the terminal MO, where the terminal MO initiates the redial after a predetermined time after the terminal MO stops establishing the current IMS call, or initiates the redial when a change in an access network is detected.
Optionally, the forwarding information between the terminal MT and the terminal MO includes: and in the information forwarding process, sending an EPS fallback identifier to the terminal MT and the terminal MO, and indicating the network side equipment to wait for executing an EPS fallback flow.
Optionally, the sending the indication information to the terminal includes: and adding a header field in the SIP message, and carrying an EPS fallback identifier.
Optionally, when the network side device detects that an IMS call is to be established, before sending the indication information to the terminal, the network side device detects that the terminal MT and/or the terminal MO are/is in the 5G network.
Fig. 2 is a schematic flow chart of an information transmission method according to an embodiment of the present invention, and as shown in fig. 2, the flow includes the following steps:
s21, the terminal MO sends request information to the terminal MT for establishing IMS conversation;
s22, receiving indication information sent by a network side device, wherein the indication information is used for indicating the network side device to wait for executing an EPS fallback flow;
and S23, stopping establishing the IMS call, and initiating redialing for establishing the IMS call to the network side equipment when a preset condition is met.
By adopting the scheme, in the process of establishing the IMS call, if the network side needs to execute the EPS fallback service, the terminal MO receives the indication information in time, correspondingly cooperates the network side, and re-initiates the IMS call when detecting that the preset conditions are met, so that the execution time of the SIP signaling interaction flow and the execution time of the EPS fallback flow are not conflicted, the problem of SIP signaling transmission failure caused by the initiation of the EPS fallback in the related technology is solved, the user time is saved, and the establishment efficiency of the IMS call is improved.
Optionally, when a preset condition is met, initiating redialing to the network side device for establishing the IMS call, including: the terminal MO initiates the redialing after the preset time after the IMS call is stopped to be established; or, initiating the redial when a change in the access network is detected.
Optionally, the preset time is obtained by one of the following methods: receiving a notification message sent by the network side equipment, and notifying the completion of the time required by the network side equipment to complete an EPS fallback flow; receiving the SIP message forwarded by the network side device, wherein the SIP message carries a Retry-After header field, and the Retry-After header field carries the preset time.
Optionally, receiving the indication information sent by the network side device includes: receiving EPS fallback identification carried in a header field added in the SIP message.
The following description is made in conjunction with specific embodiments of the present invention:
in the related art, it cannot be avoided that when the network executes EPS fallback, SIP signaling is lost due to SIP signaling interaction, and a call failure rate is increased due to a long SIP signaling retransmission interval time.
Fig. 3 is a schematic diagram of a signaling interaction flow for establishing an IMS call according to the related art, and as shown in fig. 3, SIP signaling is shown on an arrow, which is a complete signaling interaction flow for establishing an IMS call. The prior art has the problems that when the network makes an EPS fallback, the SIP signaling is also transmitted, and the EPS fallback involves the change of a network element, a transmission link is reestablished, so that the SIP signaling is lost (null lost), then the SIP signaling cannot complete interaction, and the call is also failed to be established.
In order to solve the problem that the network fails to send the SIP signaling when executing the EPS fallback, which causes the failure of establishing the IMS voice call, two schemes are provided in the specific embodiment of the present invention.
The first scheme is as follows:
in the IMS call establishment process, when the network detects that an EPS fallback flow needs to be executed, the network sends an error response, such as a 503 response, to the MO, wherein the error response carries an EPS fallback identifier and a Retry-After header field to indicate that the MO retries the call within a specified time; and simultaneously, the network sends a CANCEL request to the MT end, and the EPS fallback identifier is carried. And after the network respectively sends the two messages to the MO end and the MT end, executing an EPS fallback flow. And the MO terminal automatically redials After detecting that the current access network is changed from 5G-RAN to E-UTRAN or when the duration indicated by the Retry-After header domain is overtime, and establishes the IMS voice call in the LTE network.
Fig. 4 is a flowchart illustrating an IMS call setup procedure according to a first embodiment of the present invention, as shown in fig. 4, where F5-1 and F5-2 may occur simultaneously/F5-1 may occur before or after F5-2; f11 may occur at any step between F6 and F10; the F12 interval F7 duration is 3s (3s is not a fixed value, and depends on the specific duration returned by the network or the time when the UE detects that the current access network is the E-UTRAN), and specifically comprises the following steps:
f1, UE _ MO initiates IMS voice call, sends SIP signaling-INVITE request;
f2, the network forwards the INVITE request to the MT end;
f3, the UE _ MT replies to the SIP signaling-183 Session Progress response message;
f4, after the network receives the 183 response message, it detects that the IMS voice service can be provided only by executing the EPS fallback flow;
f5-1, the network replies 503Service Unavailable response message to the UE _ MO, the message carries EPS fallback identification, and the Retry-After head domain indicates the MO end to Retry the call again in the specified time;
f5-2, the network sends CANCEL request message to UE _ MT, the message carries EPS fallback identification;
f6, after receiving the 503 response from F5-1, the UE _ MO replies an acknowledgement, namely an ACK message, to the network;
f7, After receiving the 503 response from F5-1, the UE _ MO carries a Retry-After header field, for example: 3; then, UE _ MO may prompt the user to: redialing is automatically carried out after 3s, and the prompting method comprises but is not limited to voice prompting and text prompting;
F8-F10, after the UE _ MT receives the CANCEL message, the UE _ MT and the network carry out 200OK/487Request Terminated/ACK flow interaction according to the protocol;
f11, the network executes the EPS fallback flow;
f12, when the UE _ MO detects that the current access network is E-UTRAN or when the time length indicated by the Retry-After header field is overtime, the UE _ MO automatically redials, and establishes IMS voice communication with the UE _ MT under the LTE network.
After the scheme I is adopted, the network executes the EPS fallback, namely after CANCEL request/error response is respectively sent to the MO/MT, the MO/MT can terminate the current call, the EPS fallback is already finished when the IMS voice call is re-initiated, and at the moment, the terminals of the two parties are both under LTE, and the re-initiated call is a common VoLTE call flow.
Detailed description of the invention
When the network detects that the EPS fallback flow needs to be executed, the network executes the EPS fallback flow after ensuring that the PRACK/200OK for PRACK interaction is completed, and avoids the failure of IMS voice call establishment caused by the transmission failure of SIP signaling (namely PRACK/200OK for PRACK).
Fig. 5 is a flowchart illustrating an IMS call setup procedure according to a first embodiment of the present invention, as shown in fig. 5, including the following steps:
f1, UE _ MO initiates an IMS voice call to UE _ MT;
f2, the INVITE request message sent by the UE _ MO is forwarded to the UE _ MT through the network;
f3, the UE _ MT replies 183Session Progress;
f4, after receiving the response, the network detects that EPS fallback needs to be executed;
f5, but at this time, the network does not immediately execute the procedure, but first forwards the 183 response message to the UE _ MO, and carries an EPS fallback identity in the 183 response message;
f6, the UE _ MO receives the 183 response message carrying the EPS fallback ID, knows that the network is about to execute the EPS fallback flow, and immediately sends a PRACK request message;
f7, the network receives the PRACK request message of UE _ MO, adds EPS fallback ID before forwarding to UE _ MT;
f8, the UE _ MT receives the PRACK request message carrying the EPS fallback identification, knows that the network is about to execute the EPS fallback flow, and then sends a 200OK for PRACK response message;
f9, after the network forwards the 200OK for PRACK response message sent from the UE _ MT to the UE _ MO, the EPS fallback flow is executed;
f10, the EPS fallback flow is finished, the access type of the UE is changed from 5G-RAN to E-UTRAN, and then the interactive flow of the SIP signaling is consistent with the protocol, which is not described in detail.
After the second scheme is adopted, because the network executes the EPS fallback and the SIP signaling interaction exists at the same time, the SIP signaling is lost (mainly PRACK and 200OK for PRACK), and the second scheme is that when the network detects that the EPS fallback needs to be executed, the PRACK and 200OK for PRACK interaction are finished first, and then the EPS fallback is executed, so that the loss of the SIP signaling cannot be caused, and the call failure cannot be caused.
An embodiment of the present invention further provides an information transmission apparatus, which can be applied to a network device, and includes:
the device comprises a first sending module and a second sending module, wherein the first sending module is used for sending indication information to a terminal when detecting that an IMS (IP multimedia subsystem) call is to be established, and the indication information is used for indicating the network side equipment to execute an EPS fallback flow;
and the execution module is used for executing the SIP signaling interaction flow and the EPS fallback flow according to the preset sequence.
By adopting the scheme, the network side equipment timely informs the terminal that the EPS fallback service is to be executed currently, executes the SIP signaling interaction flow and the EPS fallback flow according to the preset sequence, and the terminal is correspondingly matched to ensure that the execution time of the two flows is not conflicted, so that the problem of SIP signaling transmission failure caused by the initiation of the EPS fallback in the related technology is solved, the user time is saved, and the establishment efficiency of the IMS call is improved.
An embodiment of the present invention further provides an information transmission apparatus, which can be applied to a terminal MO, and includes:
a second sending module, configured to send request information to the terminal MT, where the request information is used to establish an IMS call;
the device comprises a receiving module and a processing module, wherein the receiving module is used for receiving indication information sent by a network side device, and the indication information is used for indicating the network side device to wait for executing an EPS fallback flow;
and the redialing module is used for stopping establishing the IMS call and initiating redialing for establishing the IMS call to the network side equipment when a preset condition is met.
By adopting the scheme, in the process of establishing the IMS call, if the network side needs to execute the EPS fallback service, the terminal MO receives the indication information in time, performs corresponding coordination on the network side, and re-initiates the IMS call when detecting that the preset condition is met, so that the execution time of the SIP signaling interaction flow and the execution time of the EPS fallback flow are not conflicted, the problem of SIP signaling transmission failure caused by initiating the EPS fallback in the related technology is solved, the user time is saved, and the establishment efficiency of the IMS call is improved.
The apparatus of this embodiment may be configured to implement the technical solutions of the above method embodiments, and the implementation principles and technical effects are similar, which are not described herein again.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (15)

1. An information transmission method, comprising:
when detecting that an IP multimedia subsystem IMS call is to be established, network side equipment sends indication information to a terminal so that the terminal executes corresponding operations in a preset sequence; the indication information is used for indicating the network side equipment to execute an EPS fallback flow;
and the network side equipment executes a Session Initiation Protocol (SIP) signaling interaction flow and an EPS fallback flow according to a preset sequence.
2. The method of claim 1, wherein the predetermined order comprises one of:
the first sequence comprises that the network side equipment executes EPS fallback firstly and then executes SIP signaling interaction flow;
and the second sequence comprises that the network side equipment firstly executes the SIP signaling interaction flow and then executes the EPS fallback.
3. The method according to claim 2, wherein the network side device performs an SIP signaling interaction procedure and an EPS fallback procedure according to a preset sequence, and the method includes one of:
when the preset sequence is the first sequence, after receiving a 183 response transmitted by a terminal mobile called MT, the network side device sends a request for instructing stopping the establishment of the current IMS call to the terminal mobile called MT and a terminal mobile calling MO, and the network side device executes the EPS fallback flow;
and when the preset sequence is the second sequence, the network side equipment performs information forwarding between the terminal MT and the terminal MO after receiving 183 responses transmitted by the terminal mobile called MT, and executes an EPS fallback procedure after forwarding a 200OK for PRACK response message to the terminal MO.
4. The method of claim 3, wherein sending the indication to stop the establishment of the current IMS call to the terminal MT and the terminal MO comprises:
and sending an EPS fallback identifier and redialing timing to the terminal MO, wherein the redialing timing is used for redialing after timeout so as to establish an IMS (IP multimedia subsystem) conversation with the terminal MT.
5. The method of claim 4, wherein the scheme for sending the redial timing to the terminal MO comprises one of:
informing the terminal MO of the time required for completing the EPS fallback flow, wherein the terminal determines the redialing time according to the required time;
and carrying a Retry-After header field in the SIP message forwarded by the network side equipment, wherein the Retry-After header field carries the redialing timing.
6. The method according to claim 4, wherein after sending an instruction to stop establishing the current IMS call to the terminal MT and the terminal MO, and the network side device performs the EPS fallback procedure, the method further includes:
and receiving a redial initiated by the terminal MO, wherein the redial is initiated by the terminal MO after the preset time after the current IMS call is stopped to be established, or the redial is initiated when the change of an access network is detected.
7. The method according to claim 3, wherein the information forwarding between the terminal MT and the terminal MO comprises:
and in the information forwarding process, sending an EPS fallback identifier to the terminal MT and the terminal MO, and indicating the network side equipment to wait for executing an EPS fallback flow.
8. The method of claim 1, wherein sending the indication information to the terminal comprises:
and adding a header field in the SIP message, and carrying an EPS fallback identifier.
9. The method according to claim 1, wherein before the network-side device sends the indication information to the terminal when detecting that the IMS call is to be established, the method further comprises:
the network side device detects that the terminal MT and/or the terminal MO are/is under the 5G network.
10. An information transmission method, comprising:
the terminal mobile calling MO sends request information to the terminal mobile called MT for establishing IMS conversation;
receiving indication information sent by a network side device, wherein the indication information is used for indicating the network side device to wait for executing an EPS fallback flow;
and stopping establishing the IMS call, and initiating redialing for establishing the IMS call to the network side equipment when a preset condition is met so as to execute the operation of a Session Initiation Protocol (SIP) signaling interaction flow and an EPS fallback flow according to a preset sequence by matching with the network side equipment.
11. The method of claim 10, wherein initiating a redial to the network-side device for establishing the IMS call when a preset condition is met comprises:
the terminal MO initiates the redialing after the preset time after the IMS call is stopped to be established;
or, initiating the redial when a change in the access network is detected.
12. The method of claim 11, wherein the predetermined time is obtained by one of:
receiving a notification message sent by the network side equipment, and notifying the completion of the time required by the network side equipment to complete an EPS fallback procedure;
receiving a SIP message forwarded by the network side device, wherein the SIP message carries a Retry-After header field, and the Retry-After header field carries the predetermined time.
13. The method of claim 10, wherein receiving the indication information sent by the network-side device comprises:
receiving EPS fallback identification carried in a header field added in the SIP message.
14. An information transmission apparatus, comprising:
the first sending module is used for sending indication information to a terminal when detecting that an IMS call is to be established so that the terminal executes corresponding operations in a preset sequence; the indication information is used for indicating the network side equipment to execute an EPS fallback flow;
and the execution module is used for executing the SIP signaling interaction flow and the EPS fallback flow according to the preset sequence.
15. An information transmission apparatus, comprising:
a second sending module, configured to send request information to the terminal MT, where the request information is used to establish an IMS call;
the system comprises a receiving module and a processing module, wherein the receiving module is used for receiving indication information sent by a network side device, and the indication information is used for indicating the network side device to wait for executing an EPS fallback flow;
and the redialing module is used for stopping establishing the IMS call, and initiating redialing for establishing the IMS call to the network side equipment when a preset condition is met so as to cooperate with the network side equipment to execute the operation of a Session Initiation Protocol (SIP) signaling interaction flow and an EPS fallback flow according to a preset sequence.
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