CN108064061B - Message sending method, device and system - Google Patents

Message sending method, device and system Download PDF

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CN108064061B
CN108064061B CN201610986512.9A CN201610986512A CN108064061B CN 108064061 B CN108064061 B CN 108064061B CN 201610986512 A CN201610986512 A CN 201610986512A CN 108064061 B CN108064061 B CN 108064061B
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message
msc
sent
scc
identification information
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CN108064061A (en
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高扬
穆凌江
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ZTE Corp
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ZTE Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/40—Network security protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
    • 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
    • H04L65/1083—In-session procedures
    • 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
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements

Abstract

The invention provides a message sending method, a device and a system; wherein the method comprises the following steps: determining that the called equipment is in a ringing call state after the calling equipment performs single radio frequency voice continuity (SRVCC) switching before ringing; and sending a confirmation message for confirming the SRVCC to an enhanced mobile switching center E-MSC, wherein the confirmation message carries first identification information for identifying the state of the calling equipment before ringing, and the first identification information is used for indicating the ring back tone playing to the calling equipment by the E-MSC. The invention solves the problem that the calling equipment can not play the ring back tone because the called equipment directly enters the ringing call state after the SRVCC switching of the calling equipment in the related technology, thereby achieving the effect of improving the user experience.

Description

Message sending method, device and system
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a message sending method, device, and system.
Background
Single Radio Voice Call Continuity (bSRVCC) before ringing is an enhanced technical solution proposed by 3GPP for SRVCC handover of a calling subscriber when the calling subscriber has initiated a Call but the called subscriber has no ringing phase. From the perspective of radio resource reservation, since the time consumption is of the order of seconds (normally, 3-5 seconds, the network state is not good, and the time consumption is longer), the probability of SRVCC handover of the calling subscriber is high at this stage. If the calling subscriber cannot hear the ring back tone in the process, the problem of poor user experience is brought.
The specific reason is that the bSRVCC procedure currently defined by 3GPP has problems in controlling the call state and processing the ring back tone, and specifically refer to the following analysis:
fig. 1 is a flow diagram of a typical bSRVCC that can hear a ringback tone, illustrating: UE-1 is the calling user, and UE-2 is the called user. UE-1 initiates a call and a bSRVCC handover occurs before ringing.
As shown in fig. 1, the process includes:
step 1, an access side triggers bSRVCC switching;
step 2, an Enhanced Mobile switching Center (Enhanced Mobile Switch Center, abbreviated AS E-MSC) sends a switched INVITE to a Service Continuity Application server (Service Center and Continuity Application server, abbreviated AS SCC _ AS);
step 3, SCC _ AS sends SDP in INVITE to remote UE through UPDATE;
step 4, the remote UE returns 200 OK;
step 5, SCC _ AS sends SDP in 200OK to E-MSC through 183;
step 6, E-MSC returns PRACK;
step 7, SCC _ AS returns 200 OK;
step 8, because the call state before ringing is the present, SCC _ AS sends INFO to E-MSC, carrying the state before ringing (pre-alerting); it should be noted that the INFO message belongs to a signaling message of the SIP protocol;
step 9, E-MSC returns 200 OK;
step 10, the remote UE enters a ringing state and sends 180 degrees of ringing;
step 11, SCC _ AS forwards 180 to E-MSC;
and step 12, the E-MSC judges that a ringing (Alert) indication needs to be sent to the UE-1 according to the fact that the previous state is pre-alerting and the received 180, and the UE-1 puts back a ring tone to the calling user according to the indication.
However, in the engineering, there are many situations in the actual bSRVCC process due to factors such as the user operation timing and the resource reservation timing. But in accordance with existing 3GPP standards. These flow combinations will not hear the ring back tone, and fig. 2 is a schematic flow diagram of the relevant art that bSRVCC cannot hear the ring back tone, which illustrates: UE-1 is the calling user, and UE-2 is the called user. UE-1 initiates a call and a bSRVCC handover occurs before ringing. As shown in fig. 2, the process includes:
step 1, an access side triggers bSRVCC switching;
step 2, the E-MSC sends the switched INVITE to the SCC _ AS;
step 3, SCC _ AS sends SDP in INVITE to remote UE through UPDATE;
step 4, the remote UE returns 200 OK;
step 5, SCC _ AS sends SDP in 200OK to E-MSC through 183;
step 6, because of reasons such as resource reservation, the far-end UE enters the ringing state directly, send 180;
step 7, SCC _ AS forwards 180 to E-MSC;
step 8, E-MSC returns PRACK;
step 9, SCC _ AS returns 200 OK;
step 10, because the SCC _ AS has already entered the ringing call state, the SCC _ AS sends INFO to the E-MSC, carrying the state of the ringing state (early);
step 11, E-MSC returns 200 OK;
according to the existing 3GPP specification, the E-MSC sends 180 to Alert indication to the UE only if it receives 180 after receiving INFO (pre-alerting) indication. The above procedure does not meet this requirement and thus the E-MSC cannot send Alert to UE-1 and the calling subscriber will not hear the ringback tone.
The calling subscriber can not hear the ring back tone, and firstly, the experience of the calling subscriber is not good, and the subscriber can think that the ring back tone can not be continued and hangs up in advance; in addition, in many engineering bureaus, in bSRVCC handover, the ring back tone is used as an important component of the call completing rate, and the above problem may greatly reduce statistics of the call completing rate of the bureau.
In view of the above technical problems, no effective solution has been proposed at present.
Disclosure of Invention
The embodiment of the invention provides a message sending method, a device and a system, which at least solve the problem that the calling equipment cannot play a ring back tone due to the fact that the called equipment directly enters a ringing call state after SRVCC switching occurs to the calling equipment in the related technology.
According to an embodiment of the present invention, there is provided a message sending method, including: determining that the called equipment is in a ringing call state after the calling equipment performs single radio frequency voice continuity (SRVCC) switching before ringing; and sending a confirmation message for confirming the SRVCC to an enhanced mobile switching center E-MSC, wherein the confirmation message carries first identification information for identifying the state of the calling equipment before ringing, and the first identification information is used for indicating the ring back tone playing to the calling equipment by the E-MSC.
Optionally, the acknowledgement message includes information of one of: 180 messages and INFO messages.
Optionally, in a case that the confirmation message is a 180 message, the method further includes: it is determined that the INFO message has not been sent to the E-MSC before sending the acknowledgement message to the E-MSC.
Optionally, in a case that the acknowledgment message is an INFO message, before sending an acknowledgment message for acknowledging the SRVCC to the E-MSC, the method further includes: judging whether 180 messages sent by called equipment are forwarded to the E-MSC; and sending a confirmation message to the E-MSC under the condition that the judgment result is negative.
Optionally, after sending the acknowledgement message to the E-MSC, the method further includes: receiving a response message which is sent by the E-MSC and corresponds to the confirmation message; determining whether second identification information indicating that a 180 message transmitted by the called device has been received exists; in case it is determined that the second identification information exists, constructing a 180 message and transmitting the constructed 180 message to the E-MSC.
Optionally, before determining whether to forward the 180 message sent by the called device to the E-MSC, the method further includes: receiving a 180 message sent by called equipment; judging whether response information corresponding to the INFO information sent by the E-MSC is received; and under the condition that the judgment result is negative, discarding the 180 messages sent by the called equipment, adopting the second identification information to mark that the 180 messages sent by the called equipment are received, and storing the second identification information.
Optionally, after sending the acknowledgement message to the E-MSC, the method further includes: receiving a response message which is sent by the E-MSC and corresponds to the confirmation message; forwarding the media update message to the called terminal; wherein, the media updating message carries the resource reservation state completed by the called terminal; after forwarding the response message corresponding to the media update message to the E-MSC, the 180 message is forwarded to the E-MSC.
Optionally, the first identification information is carried by an extensible markup language XML structure.
According to an embodiment of the present invention, there is provided a message sending method, including: receiving a confirmation message for confirming the SRVCC, which is sent by a service continuity application server SCC _ AS, under the condition that a called device is in a ringing call state after a calling device executes single radio frequency voice continuity (SRVCC) before ringing; the confirmation message carries first identification information for identifying that the calling equipment is in a pre-ringing state, and the first identification information is used for indicating the E-MSC to play the ring back tone to the calling equipment; and sending a ringing indication message for indicating the calling equipment to play the ring back tone to the calling equipment.
Optionally, the acknowledgement message includes information of one of: 180 messages and INFO messages.
Optionally, in a case that the confirmation message is a 180 message, the method further includes: determining that the INFO message sent by the SCC _ AS has not been received before the acknowledgement message sent by the SCC _ AS.
Optionally, in a case that the acknowledgment message is an INFO message, receiving an acknowledgment message sent by the service continuity application server SCC _ AS to acknowledge the SRVCC includes: and receiving an acknowledgement message sent by the SCC _ AS under the condition that the 180 message sent by the called equipment forwarded by the SCC _ AS is not received.
Optionally, after receiving an acknowledgement message for acknowledging the SRVCC sent by the service continuity application server SCC _ AS, the method further includes: and receiving a 180 message constructed by the SCC _ AS sent by the SCC _ AS.
Optionally, before receiving the 180 message constructed by the SCC _ AS sent by the SCC _ AS, the method further includes: sending a response message corresponding to the confirmation message to the SCC _ AS; sending a media updating message to a called terminal through SCC _ AS; wherein, the media updating message carries the resource reservation state completed by the called terminal; and receiving a response message corresponding to the media update message sent by the called terminal through the SCC _ AS.
Optionally, the first identification information is carried by an extensible markup language XML structure.
According to an embodiment of the present invention, there is provided a message transmission apparatus including: a determining module, configured to determine that a called device is in a ring call state after a calling device performs single radio frequency voice continuity (SRVCC) before ringing; a sending module, configured to send a confirmation message for confirming the SRVCC to an enhanced mobile switching center E-MSC, where the confirmation message carries first identification information for identifying that the calling device is in a pre-ringing state, and the first identification information is used for the E-MSC to indicate to the calling device to play a ring back tone.
Optionally, the acknowledgement message includes information of one of: 180 messages and INFO messages.
Optionally, the determining module is further configured to determine that the INFO message is not sent to the E-MSC before the acknowledgement message is sent to the E-MSC, in a case that the acknowledgement message is a 180 message.
Optionally, the apparatus further comprises: a first judging module, configured to, when the acknowledgment message is an INFO message, before sending an acknowledgment message for acknowledging the SRVCC to the E-MSC, judge whether to forward, to the E-MSC, a 180 message sent by the called device; and under the condition that the judgment result is negative, the sending module sends a confirmation message to the E-MSC.
Optionally, the apparatus further comprises: the receiving module is used for receiving a response message which is sent by the E-MSC and corresponds to the confirmation message after the confirmation message is sent to the E-MSC; the second judging module is used for determining whether second identification information used for indicating that 180 messages sent by the called equipment are received exists; a constructing module for constructing 180 the message in case it is determined that the second identification information exists; and the sending module is also used for sending the constructed 180 message to the E-MSC.
Optionally, the receiving module is further configured to receive the 180 message sent by the called device before determining whether the 180 message sent by the called device is forwarded to the E-MSC; the first judgment module is also used for judging whether response information which is sent by the E-MSC and corresponds to the INFO information is received; the device still includes: the discarding module is used for discarding the 180 messages sent by the called equipment under the condition that the judgment result is negative; the marking module is used for marking the received 180 messages sent by the called equipment by adopting the second identification information; and the storage module is used for storing the second identification information.
Optionally, the first identification information is carried by an extensible markup language XML structure.
According to an embodiment of the present invention, there is provided a message transmission apparatus including: a receiving module, configured to receive a confirmation message for confirming SRVCC sent by a service continuity application server SCC _ AS when a called device is in a ring call state after a calling device performs single radio frequency voice continuity SRVCC before ringing; the confirmation message carries first identification information for identifying that the calling equipment is in a pre-ringing state, and the first identification information is used for indicating the E-MSC to play the ring back tone to the calling equipment; and the sending module is used for sending a ringing indication message for indicating the calling equipment to play the ring back tone to the calling equipment.
Optionally, the acknowledgement message includes information of one of: 180 messages and INFO messages.
Optionally, the apparatus further comprises: and a determining module, configured to determine, when the acknowledgment message is the 180 message, that the INFO message sent by the SCC _ AS has not been received before the acknowledgment message sent by the SCC _ AS.
Optionally, the receiving module is further configured to receive, when the acknowledgment message is an INFO message and when the 180 message sent by the called device and forwarded by the SCC _ AS is not received, the acknowledgment message sent by the SCC _ AS.
Optionally, the receiving module is further configured to receive a 180 message constructed by the SCC _ AS sent by the SCC _ AS after receiving a confirmation message sent by the service continuity application server SCC _ AS and used for confirming the SRVCC.
Optionally, the first identification information is carried by an extensible markup language XML structure.
According to an embodiment of the present invention, there is provided a system including: calling equipment, called equipment, an enhanced mobile switching center E-MSC and a service continuity application server SCC _ AS; the SCC _ AS is used for determining that the called equipment is in a ringing call state after the calling equipment executes single radio frequency voice continuity (SRVCC) before ringing; sending a confirmation message for confirming the SRVCC to the E-MSC, wherein the confirmation message carries first identification information for identifying the state of the calling equipment before ringing; the E-MSC is configured to receive the confirmation information sent by the SCC _ AS, and send a ringing indication message to the calling terminal, where the ringing indication message is used to indicate the calling device to play a ring back tone.
Optionally, the acknowledgement message includes information of one of: 180 messages and INFO messages.
Optionally, the SCC _ AS is further configured to determine that the INFO message is not sent to the E-MSC before sending the acknowledgement message to the E-MSC, in case that the acknowledgement message is a 180 message.
Optionally, the SCC _ AS is further configured to, when the acknowledgment message is an INFO message, determine whether to forward, to the E-MSC, a 180 message sent by the called device before sending, to the E-MSC, the acknowledgment message for acknowledging the SRVCC; and sending a confirmation message to the E-MSC under the condition that the judgment result is negative.
Optionally, the SCC _ AS is further configured to receive, after sending the acknowledgement message to the E-MSC, a response message corresponding to the acknowledgement message sent by the E-MSC; determining whether second identification information indicating that a 180 message transmitted by the called device has been received exists; and constructing a 180 message and transmitting the constructed 180 message to the E-MSC in case it is determined that the second identification information exists.
Optionally, the SCC _ AS is further configured to receive the 180 message sent by the called device before determining whether the 180 message sent by the called device is forwarded to the E-MSC; judging whether response information corresponding to the INFO information sent by the E-MSC is received; and under the condition that the judgment result is negative, discarding the 180 messages sent by the called device, adopting the second identification information to mark the received 180 messages sent by the called device, and storing the second identification information.
According to still another embodiment of the present invention, there is also provided a storage medium. The storage medium is configured to store program code for performing the steps of: determining that the called equipment is in a ringing call state after the calling equipment performs single radio frequency voice continuity (SRVCC) switching before ringing; and sending a confirmation message for confirming the SRVCC to an enhanced mobile switching center E-MSC, wherein the confirmation message carries first identification information for identifying the state of the calling equipment before ringing, and the first identification information is used for indicating the ring back tone playing to the calling equipment by the E-MSC.
According to still another embodiment of the present invention, there is also provided a storage medium. The storage medium is configured to store program code for performing the steps of: receiving a confirmation message for confirming the SRVCC, which is sent by a service continuity application server SCC _ AS, under the condition that a called device is in a ringing call state after a calling device executes single radio frequency voice continuity (SRVCC) before ringing; the confirmation message carries first identification information for identifying that the calling equipment is in a pre-ringing state, and the first identification information is used for indicating the E-MSC to play the ring back tone to the calling equipment; and sending a ringing indication message for indicating the calling equipment to play the ring back tone to the calling equipment.
By the invention, after the SRVCC switching of the calling equipment occurs, the called equipment directly enters the ringing call state, and the confirmation message for confirming the SRVCC is sent to the E-MSC, wherein, the confirmation message carries first identification information for identifying the calling device in the state before ringing, the first identification information is used for the E-MSC to indicate the calling device to play the ring back tone, so that the calling device can also know that the calling device is in the pre-ringing state after the called device directly enters the ringing call state, and thus the ring back tone can be played, and thus the ring back tone can be played even after the called device directly enters a ringing call state, and therefore, the problem that the ring back tone playing of the calling equipment cannot be realized due to the fact that the called equipment directly enters a ringing calling state after SRVCC switching of the calling equipment in the related technology can be solved, and the experience degree of a user is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a flow diagram illustrating a typical bSRVCC process for hearing a ringback tone;
fig. 2 is a flowchart illustrating that the bSRVCC cannot hear the ringback tone in the related art;
fig. 3 is a first flowchart of a message sending method according to an embodiment of the present invention;
fig. 4 is a schematic flowchart of a second message sending method according to an embodiment of the present invention;
FIG. 5 is a process flow diagram of a first scenario proposed in accordance with a preferred embodiment of the present invention;
FIG. 6 is a first schematic flow chart of a second scenario proposed in accordance with a preferred embodiment of the present invention;
FIG. 7 is a second flowchart illustrating a second scenario proposed by the preferred embodiment of the present invention;
FIG. 8 is a third schematic flow chart diagram of a second scenario proposed in accordance with a preferred embodiment of the present invention;
FIG. 9 is a block diagram of a first embodiment of a message sending apparatus according to the present invention;
fig. 10 is a block diagram of a second configuration of a message transmitting apparatus according to an embodiment of the present invention;
fig. 11 is a block diagram of a system provided in accordance with an embodiment of the present invention.
Detailed Description
The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
Example 1
Fig. 3 is a first flowchart of a message sending method according to an embodiment of the present invention, and as shown in fig. 3, the method includes:
step S302, after the calling device executes the SRVCC switching before ringing, the called device is in the ringing calling state;
step S304, sending a confirmation message for confirming the SRVCC to the enhanced mobile switching center E-MSC, wherein the confirmation message carries first identification information for identifying the state of the calling equipment before ringing, and the first identification information is used for indicating the ring back tone playing to the calling equipment by the E-MSC.
Through the above steps, since the called device directly enters the ringing call state after the SRVCC handover occurs in the calling device, by sending the confirmation message for confirming the SRVCC to the E-MSC, wherein, the confirmation message carries first identification information for identifying the calling device in the state before ringing, the first identification information is used for the E-MSC to indicate the calling device to play the ring back tone, so that the calling device can also know that the calling device is in the pre-ringing state after the called device directly enters the ringing call state, and thus the ring back tone can be played, and thus the ring back tone can be played even after the called device directly enters a ringing call state, and therefore, the problem that the ring back tone playing of the calling equipment cannot be realized due to the fact that the called equipment directly enters a ringing calling state after SRVCC switching of the calling equipment in the related technology can be solved, and the experience degree of a user is improved.
It should be noted that, the acknowledgement message may include one of the following information: 180 messages and INFO messages.
In an embodiment of the present invention, in a case that the acknowledgment message is a 180 message, the method may further include: it is determined that the INFO message has not been sent to the E-MSC before sending the acknowledgement message to the E-MSC.
In an embodiment of the present invention, in a case that the acknowledgment message is an INFO message, before sending an acknowledgment message for acknowledging the SRVCC to the E-MSC, the method may further include: judging whether 180 messages sent by called equipment are forwarded to the E-MSC; and sending a confirmation message to the E-MSC under the condition that the judgment result is negative.
It should be noted that, in the case that the determination result is yes, that is, in the case that the 180 message sent by the called device is forwarded to the E-MSC before the acknowledgment message for acknowledging the SRVCC is sent to the E-MSC, the acknowledgment message sent to the E-MSC carries the identification information for identifying that the calling device is in the ringing state early.
After step S304, the method may further include: receiving a response message which is sent by the E-MSC and corresponds to the confirmation message; determining whether second identification information indicating that a 180 message transmitted by the called device has been received exists; in case it is determined that the second identification information exists, constructing a 180 message and transmitting the constructed 180 message to the E-MSC.
It should be noted that, before determining whether to forward the 180 message sent by the called device to the E-MSC, the method may further include: receiving a 180 message sent by called equipment; judging whether response information corresponding to the INFO information sent by the E-MSC is received; and under the condition that the judgment result is negative, discarding the 180 messages sent by the called equipment, adopting the second identification information to mark that the 180 messages sent by the called equipment are received, and storing the second identification information.
If the determination result is yes, that is, if the response information corresponding to the INFO information transmitted from the E-MSC has been received, the 180 message is directly transmitted to the E-MSC.
In an embodiment of the present invention, after the step S304, the method may further include: receiving a response message which is sent by the E-MSC and corresponds to the confirmation message; forwarding the media update message to the called terminal; wherein, the media updating message carries the resource reservation state completed by the called terminal; after forwarding the response message corresponding to the media update message to the E-MSC, the 180 message is forwarded to the E-MSC.
It should be noted that the first identification information is carried by an XML structure of the XML, but is not limited thereto. It should be noted that, the XML structure may be:
Figure BDA0001147269890000111
it should be noted that the execution subject of the above steps may be SCC _ AS, but is not limited thereto.
An embodiment of the present invention further provides a message sending method, fig. 4 is a second flowchart of the message sending method provided in the embodiment of the present invention, and as shown in fig. 4, the method includes:
step S402, after the calling device executes single radio frequency voice continuity (SRVCC) before ringing, the called device receives the confirmation message for confirming SRVCC sent by the service continuity application server SCC _ AS under the condition that the called device is in the ringing call state; the confirmation message carries first identification information for identifying that the calling equipment is in a pre-ringing state, and the first identification information is used for indicating the E-MSC to play the ring back tone to the calling equipment;
step S404, sending a ringing indication message to the calling device for indicating the calling device to play the ring back tone.
Through the steps, after the SRVCC handover occurs to the calling device, the called device directly enters the ring call state, and then receives the confirmation message for confirming the SRVCC, wherein the confirmation message carries the first identification information for identifying the state of the calling device before the ring, and sends the ring indication message for indicating the calling device to play the ring back tone to the calling device, so that the calling device can also play the ring back tone after the called device directly enters the ring call state.
It should be noted that, the acknowledgement message may include one of the following information: 180 messages and INFO messages.
In an embodiment of the present invention, in a case that the acknowledgment message is a 180 message, the method may further include: determining that the INFO message sent by the SCC _ AS has not been received before the acknowledgement message sent by the SCC _ AS.
In an embodiment of the present invention, in the case that the acknowledgment message is an INFO message, the step S402 may include: and receiving an acknowledgement message sent by the SCC _ AS under the condition that the 180 message sent by the called equipment forwarded by the SCC _ AS is not received.
After the step S402, the method may further include: and receiving a 180 message constructed by the SCC _ AS sent by the SCC _ AS.
In an embodiment of the present invention, before receiving the 180 message constructed by the SCC _ AS sent by the SCC _ AS, the method may further include: sending a response message corresponding to the confirmation message to the SCC _ AS; sending a media updating message to a called terminal through SCC _ AS; wherein, the media updating message carries the resource reservation state completed by the called terminal; and receiving a response message corresponding to the media update message sent by the called terminal through the SCC _ AS.
It should be noted that the first identification information may be carried by an XML structure of extensible markup language.
It should be noted that, the XML structure may be:
Figure BDA0001147269890000121
Figure BDA0001147269890000131
it should be noted that the execution subject of the steps of the method shown in fig. 4 may be an E-MSC, but is not limited thereto.
For a better understanding of the present invention, the present invention is further explained below with reference to preferred examples.
The embodiment of the invention provides two preferable schemes for switching bSRVCC to support ring back tone:
the first scheme is as follows: the problem is solved by matching SCC _ AS and E-MSC, specifically, after the SCC _ AS receives 180, the SCC _ AS forwards the 180 to the calling party when the following conditions are met, and needs to carry an XML structure of pre-alerting.
Structure of XML:
Figure BDA0001147269890000132
conditions are as follows: currently, a bSRVCC handover; and no INFO (pre-alerting) has been sent to the caller;
the E-MSC receives 180 of XML structure carrying pre-alerting, sends Alert indication to the calling UE, and the UE plays the sound to the calling user.
It should be noted that, the first scheme has the advantages of simple logic and convenient implementation.
Scheme II:
the method is separately solved by SCC _ AS, constructs messages by controlling time sequence, and normalizes the interaction part with E-MSC in all bSRVCC compatible flows into standard 3GPP flows. Logic of SCC _ AS processing:
1, judging whether the switching is bSRVCC switching
2, after receiving 180, judging whether 200OK corresponding to INFO is received, if 200OK is received, sending 180; if no 200OK has been received, the 180 is discarded and the mark is made to indicate that 180 has been received
3, when needing to send INFO, judging whether 180 sent forward, if not 180 sent, the INFO has XML structure of pre-alerting; if 180 has been sent, then the INFO with early XML structure
4, receive 200OK for INFO, if there is a flag that 180 has been received, construct 180 is sent to the forward direction.
For the second scheme, the method has the advantages that only the SCC _ AS network element is modified, the method can be in butt joint with E-MSCs of other manufacturers, and the problem is solved.
Through the scheme, the calling subscriber can normally hear the ring back tone in the switching process of the bSRVCC.
Fig. 5 is a schematic processing flow diagram of a first solution proposed in the preferred embodiment of the present invention, and as shown in fig. 5, the flow includes:
1, an access side triggers bSRVCC switching;
2, E-MSC sends the switched INVITE call request to SCC _ AS;
3, SCC _ AS sends SDP in INVITE to remote UE through UPDATE media UPDATE message;
4, the remote UE returns a 200OK response message;
5, SCC _ AS sends SDP in the 200OK response message to E-MSC through 183 message;
6, because of the reasons of resource reservation, the remote UE directly enters a ringing state and sends a 180 message;
7, SCC _ AS forwards 180 and sends the call state carrying pre-alerting to the E-MSC;
8, the E-MSC sends Alert to calling UE according to 180 and carrying pre-alerting calling state, and the calling user can hear the ring back tone;
9, E-MSC returns PRACK request message;
10, SCC _ AS returns 200OK response message;
11, because the SCC _ AS already enters the ringing call state, the SCC _ AS sends an INFO request message to the E-MSC, carrying early status;
12, the E-MSC returns a 200OK response message.
For scheme two, there is support for multiple bSRVCC compatible procedures:
fig. 6 is a first schematic flow chart of a second scheme proposed according to a preferred embodiment of the present invention, which includes:
1, an access side triggers bSRVCC switching;
2, E-MSC sends the switched INVITE call request to SCC _ AS;
3, SCC _ AS sends SDP in INVITE to remote UE through UPDATE media UPDATE message;
4, the remote UE returns a 200OK response message;
5, SCC _ AS sends SDP in the 200OK response message to E-MSC through 183 message;
6, because of the reasons of resource reservation, the remote UE directly enters a ringing state and sends a 180 message;
7, E-MSC returns PRACK request message;
8, SCC _ AS returns 200OK response message;
9, although the SCC _ AS has entered the ring call state at this time, sending INFO to the E-MSC, carrying pre-alerting;
10, E-MSC returns 200OK response message;
11, according to the previously recorded call state of the backward received 180 message, SCC _ AS sends 180 message to E-MSC;
12, the E-MSC sends an Alert message to the UE-1 and the calling subscriber can hear the ringback tone.
Fig. 7 is a second schematic flow chart of a second solution proposed according to the preferred embodiment of the present invention, and the second flow chart includes:
1, an access side triggers bSRVCC switching;
2, E-MSC sends the switched INVITE call request to SCC _ AS;
3, because the SDP of the INVITE is the same AS the original call and the like, SCC _ AS does not need to send an UPDATE media UPDATE message to UE-2; at this time, UE-2 does not need to accept UPDATE, and the backward 180 message is directly sent; SCC _ AS discards the 180, but records the state of receiving the backward 180 message;
4, SCC _ AS constructs SDP and sends the SDP to E-MSC through 183 message;
5, E-MSC returns PRACK request message;
6, SCC _ AS returns 200OK response message;
7, although the SCC _ AS enters the ringing call state at this time, the SCC _ AS sends INFO to the E-MSC, carrying the pre-alerting state;
8, E-MSC returns 200OK response message;
9, according to the previously recorded call state of the backward received 180 message, SCC _ AS sends the 180 message to E-MSC;
10, the E-MSC sends an Alert message to the UE-1 and the calling subscriber can hear the ringback tone.
Fig. 8 is a third schematic flow chart of a second scheme proposed according to a preferred embodiment of the present invention, which includes:
1, an access side triggers bSRVCC switching;
2, E-MSC sends the switched INVITE call request to SCC _ AS;
3, SCC _ AS sends SDP in INVITE to remote UE through UPDATE media UPDATE message;
4, the remote UE returns a 200OK response message;
5, SCC _ AS sends SDP in the 200OK response message to E-MSC through 183 message;
6, E-MSC returns PRACK request message;
7, SCC _ AS returns 200OK response message;
8, though the SCC _ AS enters the ringing call state at this time, the SCC _ AS sends an INFO request message to the E-MSC, carrying the pre-alerting state;
9, E-MSC returns 200OK response message;
10, for the reason of resource reservation, the called party needs to wait for the completion of the resource reservation state to ring; E-MSC sends UPDATE media UPDATE message to SCC _ AS; carrying the completed resource reservation state;
11, SCC _ AS forwards UPDATE media UPDATE message to UE-2;
12, UE-2 returns 200OK response message;
13, SCC _ AS sends 200OK response message to E-MSC;
14, UE-2 sends 180 message;
15, SCC _ AS forwards 180 messages to the E-MSC;
the E-MSC sends an Alert message to UE-1 and the calling subscriber can hear the ringback tone.
Through the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.
Example 2
In this embodiment, a message sending apparatus is further provided, and the apparatus is used to implement the foregoing embodiments and preferred embodiments, and details of which have been already described are omitted. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.
Fig. 9 is a block diagram of a first structure of a message sending apparatus according to an embodiment of the present invention, as shown in fig. 9, the apparatus includes:
a determining module 92, configured to determine that the called device is in a ring call state after the calling device performs SRVCC before ringing;
a sending module 94, connected to the determining module 92, configured to send a confirmation message for confirming the SRVCC to the enhanced mobile switching center E-MSC, where the confirmation message carries first identification information for identifying that the calling device is in a pre-ringing state, and the first identification information is used for indicating, by the E-MSC, that the ring back tone is played to the calling device.
By the above apparatus, after the SRVCC handover occurs to the calling device and the called device directly enters the ring call state, the sending module 94 sends a confirmation message for confirming the SRVCC to the E-MSC, where the confirmation message carries first identification information for identifying the state of the calling device before ringing, and the first identification information is used for the E-MSC to indicate the ring back tone to the calling device, so that the calling device can know that the calling device is in the state before ringing and can play the ring back tone after the called device directly enters the ring call state, and further the ring back tone can be played after the called device directly enters the ring call state, therefore, the problem that the ring back tone cannot be played by the calling device due to the fact that the called device directly enters the ring call state after the SRVCC handover occurs to the calling device in the related art can be solved, the experience degree of the user is improved.
It should be noted that, the acknowledgement message may include one of the following information: 180 messages and INFO messages.
In an embodiment of the present invention, the determining module 92 may be further configured to determine that the INFO message is not sent to the E-MSC before the acknowledgement message is sent to the E-MSC in the case that the acknowledgement message is a 180 message.
In an embodiment of the present invention, the apparatus may further include: a first judging module, configured to, when the acknowledgment message is an INFO message, before sending an acknowledgment message for acknowledging the SRVCC to the E-MSC, judge whether to forward, to the E-MSC, a 180 message sent by the called device; if the determination result is negative, the sending module 94 sends an acknowledgement message to the E-MSC.
In an embodiment of the present invention, the apparatus may further include: the receiving module is used for receiving a response message which is sent by the E-MSC and corresponds to the confirmation message after the confirmation message is sent to the E-MSC; the second judging module is used for determining whether second identification information used for indicating that 180 messages sent by the called equipment are received exists; a constructing module for constructing 180 the message in case it is determined that the second identification information exists; the sending module 94 may be further configured to send the constructed 180 message to the E-MSC.
It should be noted that, the receiving module may be further configured to receive the 180 message sent by the called device before determining whether the 180 message sent by the called device is forwarded to the E-MSC; the first judging module may be further configured to judge whether a response message corresponding to the INFO message sent by the E-MSC is received; the above apparatus may further include: the discarding module is used for discarding the 180 messages sent by the called equipment under the condition that the judgment result is negative; the marking module is connected with the discarding module and is used for marking the received 180 messages sent by the called equipment by adopting second identification information; and the storage module is connected with the marking module and is used for storing second identification information.
In an embodiment of the present invention, the receiving module is further configured to receive a response message corresponding to the acknowledgment message sent by the E-MSC after sending the acknowledgment message to the E-MSC; the sending module 94 is further configured to forward the media update message to the called terminal; wherein, the media updating message carries the resource reservation state completed by the called terminal; and after forwarding the response message corresponding to the media update message to the E-MSC, forwarding the 180 message to the E-MSC.
It should be noted that the first identification information may be carried by an XML structure of extensible markup language.
It should be noted that the above-mentioned apparatus may be located in the SCC _ AS, but is not limited thereto.
It should be noted that, the above modules may be implemented by software or hardware, and for the latter, the following may be implemented, but not limited to: the modules are all positioned in the same processor; alternatively, the modules are respectively located in different processors in any combination.
Example 3
In this embodiment, a message sending apparatus is further provided, and the apparatus is used to implement the foregoing embodiments and preferred embodiments, and details of which have been already described are omitted. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.
Fig. 10 is a block diagram of a second structure of a message sending apparatus according to an embodiment of the present invention, as shown in fig. 10, the apparatus includes:
a receiving module 1002, configured to receive a confirmation message sent by a service continuity application server SCC _ AS and used for confirming an SRVCC, when a called device is in a ring call state after a calling device performs a single radio frequency voice continuity SRVCC before ringing; the confirmation message carries first identification information for identifying that the calling equipment is in a pre-ringing state, and the first identification information is used for indicating the E-MSC to play the ring back tone to the calling equipment;
a sending module 1004, connected to the receiving module 1002, for sending a ringing indication message to the calling device, where the ringing indication message is used to indicate the calling device to play a ring back tone.
Through the device, after the SRVCC handover occurs to the calling device, the called device directly enters the ring-down calling state, the receiving module 1002 receives the confirmation message for confirming the SRVCC, wherein the confirmation message carries the first identification information for identifying the state of the calling device before the ring-down, so that the ring-down tone can be played after the called device directly enters the ring-down calling state.
It should be noted that, the acknowledgement message may include one of the following information: 180 messages and INFO messages.
In an embodiment of the present invention, the apparatus may further include: and a determining module, configured to determine, when the acknowledgment message is the 180 message, that the INFO message sent by the SCC _ AS has not been received before the acknowledgment message sent by the SCC _ AS.
It should be noted that the receiving module 1002 may be further configured to receive the confirmation message sent by the SCC _ AS when the confirmation message is an INFO message and when the 180 message sent by the called device and forwarded by the SCC _ AS is not received.
It should be noted that the receiving module 1002 may be further configured to receive a 180 message constructed by the SCC _ AS sent by the SCC _ AS after receiving a confirmation message sent by the service continuity application server SCC _ AS and used for confirming the SRVCC.
In an embodiment of the present invention, the apparatus may further include: a media update module, configured to send a response message corresponding to the confirmation message to the SCC _ AS; sending a media updating message to a called terminal through SCC _ AS; wherein, the media updating message carries the resource reservation state completed by the called terminal; and receiving a response message corresponding to the media update message, which is sent by the called terminal, through the SCC _ AS.
It should be noted that the first identification information may be carried by an XML structure of extensible markup language.
Example 4
An embodiment of the present invention provides a system, and fig. 11 is a block diagram of a structure of the system provided in the embodiment of the present invention, and as shown in fig. 11, the system includes: a calling device 1102, a called device 1104, an enhanced mobile switching center E-MSC1106 and a service continuity application server SCC _ AS 1108; wherein the content of the first and second substances,
SCC _ AS1108 is configured to determine that called device 1104 is in a ring call state after calling device 1102 performs SRVCC before ringing; sending a confirmation message for confirming the SRVCC to the E-MSC1106, wherein the confirmation message carries first identification information for identifying that the calling equipment is in a pre-ringing state;
E-MSC1106 is configured to receive the confirmation information sent by SCC _ AS1108, and send a ring indication message to calling device 1102 for instructing calling device 1102 to play a ring back tone.
Through the system, the calling device 1102 can know that the calling device 1102 is in the state before ringing after the called device 1104 directly enters the ringing call state, and then the ring back tone can be played, so that the ring back tone can be played after the called device 1104 directly enters the ringing call state, therefore, the problem that the calling device cannot play the ring back tone due to the fact that the called device directly enters the ringing call state after the calling device is switched by the SRVCC in the related art can be solved, and the experience degree of a user is improved.
It should be noted that, the acknowledgement message may include one of the following information: 180 messages and INFO messages.
In an embodiment of the present invention, the SCC _ AS1108 may be further configured to determine that an INFO message has not been sent to the E-MSC1106 before sending the acknowledgement message to the E-MSC1106, in case that the acknowledgement message is a 180 message.
It should be noted that the SCC _ AS1108 may be further configured to, when the acknowledgment message is an INFO message, before sending the acknowledgment message for acknowledging the SRVCC to the E-MSC1106, determine whether to forward the 180 message sent by the called device to the E-MSC 1106; and if the judgment result is negative, sending a confirmation message to the E-MSC 1106.
It should be noted that the SCC _ AS1108 may be further configured to receive a response message corresponding to the acknowledgement message sent by the E-MSC1106 after sending the acknowledgement message to the E-MSC 1106; determining whether second identification information indicating that a 180 message transmitted by the called device has been received exists; and constructing a 180 message and transmitting the constructed 180 message to the E-MSC1106 in case it is determined that the second identification information exists.
It should be noted that the SCC _ AS1108 may be further configured to receive the 180 message sent by the called device 1104 before determining whether to forward the 180 message sent by the called device 1104 to the E-MSC 1106; judging whether response information corresponding to the INFO information sent by the E-MSC1106 is received; and under the condition that the judgment result is negative, discarding the 180 messages sent by the called device 1104, marking the received 180 messages sent by the called device 1104 by adopting the second identification information, and storing the second identification information.
It should be noted that the first identification information is carried by an XML structure of the XML, but is not limited thereto. It should be noted that, the XML structure may be:
Figure BDA0001147269890000221
example 5
The embodiment of the invention also provides a storage medium. Alternatively, in the present embodiment, the above-mentioned storage medium may be configured to store program codes for executing the steps of the method in embodiment 1.
Optionally, in this embodiment, the storage medium may include, but is not limited to: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
Alternatively, in the present embodiment, the processor executes the steps of the method in embodiment 1 according to the program code stored in the storage medium.
Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments and optional implementation manners, and this embodiment is not described herein again.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (20)

1. A method for sending a message, comprising:
determining that the called equipment is in a ringing call state after the calling equipment performs single radio frequency voice continuity (SRVCC) switching before ringing;
sending a confirmation message for confirming the SRVCC to an enhanced mobile switching center (E-MSC), wherein the confirmation message carries first identification information for identifying that the calling equipment is in a pre-ringing state, and the first identification information is used for indicating the ring back tone playing to the calling equipment by the E-MSC;
the first identification information is carried by an extensible markup voice XML structure;
the acknowledgement message includes information of one of: 180 messages and INFO messages;
wherein, in case that the confirmation message is the 180 message, the method further comprises:
determining that the INFO message was not sent to the E-MSC before sending the acknowledgement message to the E-MSC.
2. The method of claim 1, wherein in case the acknowledgement message is the INFO message, before sending the acknowledgement message for acknowledging SRVCC to the E-MSC, the method further comprises:
judging whether 180 messages sent by the called equipment are forwarded to the E-MSC;
and sending the confirmation message to the E-MSC under the condition that the judgment result is negative.
3. The method of claim 2, wherein after sending the acknowledgement message to the E-MSC, the method further comprises:
receiving a response message which is sent by the E-MSC and corresponds to the confirmation message;
determining whether second identification information indicating that a 180 message transmitted by the called device has been received exists;
in case it is determined that the second identification information exists, constructing a 180 message and transmitting the constructed 180 message to the E-MSC.
4. The method of claim 3, wherein before determining whether to forward the 180 message sent by the called device to the E-MSC, the method further comprises:
receiving 180 messages sent by the called equipment;
judging whether response information corresponding to the INFO information sent by the E-MSC is received;
and under the condition that the judgment result is negative, discarding the 180 messages sent by the called equipment, adopting the second identification information to mark that the 180 messages sent by the called equipment are received, and storing the second identification information.
5. The method of claim 3, wherein after sending the acknowledgement message to the E-MSC, the method further comprises:
receiving a response message which is sent by the E-MSC and corresponds to the confirmation message;
forwarding a media update message to the called device; wherein, the media updating message carries the resource reservation state completed by the called device;
after forwarding a response message corresponding to the media update message to the E-MSC, forwarding a 180 message to the E-MSC.
6. A method for sending a message, comprising:
receiving a confirmation message for confirming the SRVCC, which is sent by a service continuity application server SCC _ AS, under the condition that a called device is in a ringing call state after a calling device executes single radio frequency voice continuity (SRVCC) before ringing; wherein, the confirmation message carries first identification information for identifying the state of the calling device before ringing, and the first identification information is used for an enhanced mobile switching center E-MSC to indicate the ring back tone to be played to the calling device;
sending a ringing indication message for indicating the calling equipment to play the ring back tone to the calling equipment;
the first identification information is carried by an extensible markup voice XML structure;
the acknowledgement message includes information of one of: 180 messages and INFO messages;
in the case that the confirmation message is the 180 message, the method further comprises:
determining that the INFO message sent by the SCC _ AS has not been received before the acknowledgement message sent by the SCC _ AS.
7. The method of claim 6, wherein receiving an acknowledgement message for acknowledging SRVCC sent by a service continuity application server SCC _ AS, in case that the acknowledgement message is the INFO message, comprises:
and receiving the confirmation message sent by the SCC _ AS under the condition that the 180 message sent by the called equipment forwarded by the SCC _ AS is not received.
8. The method of claim 7, wherein after receiving an acknowledgement message for acknowledging the SRVCC sent by a service continuity application server SCC _ AS, the method further comprises:
and receiving a 180 message constructed by the SCC _ AS sent by the SCC _ AS.
9. The method of claim 8, wherein prior to receiving the SCC _ AS constructed 180 message sent by the SCC _ AS, the method further comprises:
sending a response message corresponding to the confirmation message to the SCC _ AS;
sending a media update message to the called device through the SCC _ AS; wherein, the media updating message carries the resource reservation state completed by the called device;
and receiving a response message corresponding to the media update message, which is sent by the called device, through the SCC _ AS.
10. A message transmission apparatus, comprising:
a determining module, configured to determine that a called device is in a ring call state after a calling device performs single radio frequency voice continuity (SRVCC) before ringing;
a sending module, configured to send a confirmation message for confirming SRVCC to an enhanced mobile switching center E-MSC, where the confirmation message carries first identification information for identifying that the calling device is in a pre-ringing state, where the first identification information is used for the E-MSC to indicate to the calling device to play a ring back tone, and the first identification information is carried in an extensible markup voice XML structure, and the confirmation message includes one of the following information: 180 messages and INFO messages;
the determining module is further configured to determine that the INFO message has not been sent to the E-MSC before the confirmation message is sent to the E-MSC if the confirmation message is the 180 message.
11. The apparatus of claim 10, further comprising:
a first determining module, configured to determine, when the acknowledgment message is the INFO message, whether a 180 message sent by the called device is forwarded to the E-MSC before sending the acknowledgment message for acknowledging the SRVCC to the E-MSC; and under the condition that the judgment result is negative, the sending module sends the confirmation message to the E-MSC.
12. The apparatus of claim 11, further comprising: a receiving module, configured to receive a response message corresponding to the acknowledgement message sent by the E-MSC after sending the acknowledgement message to the E-MSC; a second judging module, configured to determine whether second identification information indicating that a 180 message sent by the called device has been received exists; a constructing module for constructing 180 a message in case it is determined that the second identification information exists;
the sending module is further configured to send the constructed 180 message to the E-MSC.
13. The apparatus of claim 12, wherein the receiving module is further configured to receive the 180 message sent by the called device before determining whether the 180 message sent by the called device is forwarded to the E-MSC; the first judging module is further configured to judge whether response information corresponding to the INFO information sent by the E-MSC is received;
the device further comprises: a discarding module, configured to discard 180 messages sent by the called device if the determination result is negative; the marking module is used for marking the received 180 messages sent by the called equipment by adopting the second identification information; and the storage module is used for storing the second identification information.
14. A message transmission apparatus, comprising:
a receiving module, configured to receive a confirmation message for confirming SRVCC sent by a service continuity application server SCC _ AS when a called device is in a ring call state after a calling device performs single radio frequency voice continuity SRVCC before ringing; wherein, the confirmation message carries first identification information for identifying that the calling device is in a pre-ringing state, the first identification information is used for an enhanced mobile switching center E-MSC to indicate to the calling device to play a ring back tone, the first identification information is carried by an extensible markup language XML structure, and the confirmation message includes one of the following information: 180 messages and INFO messages;
a sending module, configured to send a ringing indication message to the calling device, where the ringing indication message is used to indicate the calling device to play a ring back tone;
a determining module, configured to determine that the INFO message sent by the SCC _ AS has not been received before the acknowledgment message sent by the SCC _ AS if the acknowledgment message is the 180 message.
15. The apparatus of claim 14, wherein the receiving module is further configured to receive the acknowledgement message sent by the SCC _ AS if the acknowledgement message is the INFO message and if a 180 message sent by the called device and forwarded by the SCC _ AS is not received.
16. The apparatus of claim 15, wherein the receiving module is further configured to receive a 180 message constructed by a service continuity application server SCC _ AS sent by the SCC _ AS after receiving an acknowledgement message sent by the SCC _ AS to acknowledge SRVCC.
17. A messaging system, comprising: calling equipment, called equipment, an enhanced mobile switching center E-MSC and a service continuity application server SCC _ AS;
the SCC _ AS is configured to determine that the called device is in a ring call state after the calling device performs SRVCC before ringing; sending a confirmation message for confirming the SRVCC to the E-MSC, wherein the confirmation message carries first identification information for identifying that the calling equipment is in a pre-ringing state;
the E-MSC is configured to receive the confirmation information sent by the SCC _ AS, and send a ringing indication message used for indicating the calling device to play a ring back tone to the calling device;
the first identification information is carried by an extensible markup voice XML structure;
wherein the confirmation message includes information of one of: 180 messages and INFO messages;
the SCC _ AS is further configured to determine that the INFO message has not been sent to the E-MSC before sending the acknowledgement message to the E-MSC if the acknowledgement message is the 180 message.
18. The system of claim 17, wherein the SCC _ AS is further configured to determine whether a 180 message sent by the called device is forwarded to the E-MSC before sending the acknowledgment message for acknowledging SRVCC to the E-MSC if the acknowledgment message is the INFO message; and sending the confirmation message to the E-MSC under the condition that the judgment result is negative.
19. The system of claim 18, wherein the SCC _ AS is further configured to receive a response message corresponding to the acknowledgement message sent by the E-MSC after sending the acknowledgement message to the E-MSC; determining whether second identification information indicating that a 180 message transmitted by the called device has been received exists; and constructing a 180 message and transmitting the constructed 180 message to the E-MSC in case it is determined that the second identification information exists.
20. The system of claim 19, wherein the SCC _ AS is further configured to receive a 180 message sent by the called device before determining whether the 180 message sent by the called device is forwarded to the E-MSC; judging whether response information corresponding to the INFO information sent by the E-MSC is received; and under the condition that the judgment result is negative, discarding the 180 messages sent by the called device, adopting the second identification information to mark that the 180 messages sent by the called device are received, and storing the second identification information.
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