CN106488521B - A kind of method, apparatus of call treatment, equipment and system - Google Patents
A kind of method, apparatus of call treatment, equipment and system Download PDFInfo
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- CN106488521B CN106488521B CN201610847336.0A CN201610847336A CN106488521B CN 106488521 B CN106488521 B CN 106488521B CN 201610847336 A CN201610847336 A CN 201610847336A CN 106488521 B CN106488521 B CN 106488521B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract
The invention discloses a kind of methods of call treatment, it include: when the call link of user equipment is switched to 2G or 3G network by LTE network and realizes SRVCC handoff functionality, the present call state of the present call state of user equipment inquiry 2G or 3G network, the 2G or 3G network corresponds to the call link；The present call state of the call link is moved to and simultaneous call state corresponding to the present call state of 2G or 3G network；According to simultaneous call state, call flows are executed in the call link.The method of call treatment provided in an embodiment of the present invention, user equipment can first inquire the present call state of 2G or 3G network, then state synchronized is carried out, to keep the call state of user equipment side call link consistent with the call state of 2G or 3G network, it realizes state synchronized, therefore substantially increases the call successful rate after SRVCC.
Description
Technical field
The present invention relates to the communications fields, and in particular to a kind of method, apparatus of call treatment, equipment and system.
Background technique
Due to many advantages such as spectral efficient, peak value efficiency, high mobility and network architecture flattenings, new one
Third-generation mobile communication technology long term evolution (Long Term Evolution, LTE) is rapidly developed, in LTE network overlay area
Interior, user equipment (User Equipment, UE) is based on LTE and IP multimedia subsystem (IP Multimedia
Subsystem, IMS) realize voice service, i.e., the voice service (Voice over LTE, VOLTE) based on LTE.Due to
The initial stage of LTE deployment, LTE network limited coverage area, therefore can network frequent occurrence switching, i.e., be switched to by LTE general
Mobile communication system (Universal Mobile Telecommunications System, UMTS) by LTE alternatively, be switched to
Global system for mobile communications (Global System for Mobile Communication, GSM).And it is in communication process
The continuity for guaranteeing call, introduces single wireless voice calling continuity (Single Radio Voice Call
Continuity, SRVCC) function.When user equipment is when removing LTE network coverage area, ongoing voice service
It will be switched to domain circuit switching (Circuit Switched, CS) of 2G/3G network, to guarantee the continuous of audio call
Property.
Current third generation partner program (3rd Generation Partnership Project, 3GPP) agreement rule
Fixed, when SRVCC switching initiation occurs, UE call state is synchronized to the circuit switching of GSM/UTMS (abbreviation GU) by IMS protocol stack
(Circuit Switched, CS) Call Control Block, and the call state of network be then by IMS core net and CS core net into
Row internal synchronization.After SRVCC is switched successfully, call state that the CS Call Control Block of UE synchronizes according to IMS protocol stack
Further call flow processing is done, such as: if synchronous call state is that have phone incoming call (INCOMING) state, to use
Family prompt incoming call, waits user's to answer operation.
However, the processing mode of above-mentioned UE is under the premise of the call state of the call state of default UE and network is consistent
It carries out, if the calling network state after UE and SRVCC is inconsistent, call treatment of the UE under the domain CS is all blind behaviour
A possibility that work, phone fails, is very big.
Summary of the invention
It is inconsistent in view of the calling network state after UE and SRVCC, a possibility that phone fails very big problem, the present invention
Embodiment provides a kind of method of call treatment, the call successful rate after being able to ascend SRVCC.The embodiment of the invention also provides
Corresponding device, equipment and system.
First aspect present invention provides a kind of method of call treatment, and the call link that this method is applied to user equipment exists
During long term evolution LTE network is switched to 2G or 3G network, this method comprises: when the call link of user equipment is by long-term
When evolution LTE network is switched to 2G or 3G network and realizes single wireless voice calling continuity SRVCC handoff functionality, Yong Hushe
The present call state of the present call state for future reference for asking 2G or 3G network, 2G or 3G network corresponds to the call link；The use
Family equipment moves to the present call state of the call link and the 2G or 3G according to 2G or the present call state of 3G network
Simultaneous call state corresponding to the present call state of network；The user equipment is exhaled according to the simultaneous call state, at this
Chain road is made to execute call flows.By first aspect as it can be seen that user equipment can first inquire 2G or the current of 3G network exhales
It is state, according to the call state of 2G or the present call state migrated users equipment of the 3G network call link, to use
The call state of the call link of family equipment is consistent with the call state of 2G or 3G network, realizes that call state is synchronous, therefore
Call successful rate after substantially increasing SRVCC.
With reference to first aspect, in the first possible implementation, the step in first aspect: user equipment inquires 2G
Or the present call state of 3G network, comprising: the network equipment of the user equipment into 2G or 3G network sends status request message,
The instruction TI value of the call link is carried in the status request message, to indicate that the user equipment needs to inquire to the network equipment
The present call state of 2G corresponding with the call link or 3G network；The user equipment receives the 2G or 3G that the network equipment is sent
The present call state of network.One user equipment might have several call links, each calling chain in a period of time
Road all uniquely corresponds to a TI value, the present call state of the 2G of call link or 3G network there is usually one.By
On the one hand the first possible implementation is as it can be seen that the network equipment of the user equipment into 2G or 3G network sends call link
TI value, so as to ensure that the network equipment can accurately search the current network state of call link corresponding to the TI value.
With reference to first aspect or first aspect the first possible implementation, in the second possible implementation,
It is answered when switching occurs to be clicked by user in user equipment in the incoming call of LTE network, and user equipment is to 2G or 3G network
In the network equipment send connection message and when not receiving the connection confirmation message of the network equipment；If 2G or the current of 3G network exhale
Being state is call received state, then the simultaneous call state is connection request state, and above-mentioned execution call flows
It include: to send connection message to the network equipment in the circuit-switched CS domain of 2G or 3G network；Or, if 2G or 3G network it is current
Call state is on-state, then the simultaneous call state is on-state, and above-mentioned execution call flows include: entrance
To talking state；Or, the simultaneous call state is described if the present call state of 2G or 3G network is connection request state
Connection request state, and above-mentioned execution call flows include: to wait the reply of the connection reply of the network equipment.By first
Second of aspect possible implementation is as it can be seen that when switching occurs to have been clicked by user in user equipment in the incoming call of LTE network
Answer, and user equipment the network equipment into 2G or 3G network send connection message and do not receive the network equipment connection it is true
When recognizing message, the present call state of call link can be moved to the present call state with 2G or 3G network by user equipment
Corresponding simultaneous call state, to improve the call successful rate under the scene after SRVCC.
With reference to first aspect or first aspect the first possible implementation, in the third possible implementation,
Occur to initiate to call in the LTE network in the user equipment when switching, and has sent and invited INVITE to the 2G or 3G
The network equipment in network, and do not receive the network equipment 180 reply when；If the present call state of 2G or 3G network is
Idle state, then the simultaneous call state is idle state, and above-mentioned execution call flows include: that prompt is hung up in execution；
Or, the simultaneous call state is mobile management (Mobile if the present call state of 2G or 3G network is idle state
Mangenment, MM) connection status, and above-mentioned execution call flows include: to send calling to the network equipment again
Request；Or, the simultaneous call state is that shape is initiated in calling if the present call state of 2G or 3G network is calling initiation state
State, and above-mentioned execution call flows include: to wait the call proceeding message of the network equipment；Or, if 2G or 3G network
Present call state be calling carry out state, then the simultaneous call state is calling carry out state, and at above-mentioned execution calling
Managing process includes: the ALERTING message for waiting the network equipment.The third possible implementation by first aspect is as it can be seen that when cutting
It changes life to initiate to call in the LTE network in the user equipment, and has sent and invited INVITE to the 2G or 3G network
In the network equipment, and do not receive the network equipment 180 reply when, user equipment can be by the active calls of call link
State transition to simultaneous call state corresponding to the present call state of 2G or 3G network, to improve under the scene
Call successful rate after SRVCC.
With reference to first aspect or first aspect the first possible implementation, in the fourth possible implementation,
When switching occur user equipment LTE network initiate call, and the user equipment be in ringing condition and do not receive by
When answering instruction or hanging up instruction of user equipment is cried, if the present call state of 2G or 3G network is that calling has issued state,
Then the simultaneous call state is that calling has issued state, and above-mentioned execution call flows include: to wait in 2G or 3G network
The network equipment issue and answer instruction；If the present call state of 2G or 3G network is on-state, the simultaneous call state
For the on-state, and above-mentioned execution call flows include: into talking state；If the 2G or the current of 3G network exhale
Being state is to hang up instruction state, then the simultaneous call state hangs up instruction state, and above-mentioned execution call treatment stream to be described
Journey includes: to carry out the operating process of end of calling.Wherein, end of calling is to hang up the telephone.It is possible by the 4th kind of first aspect
Implementation when switching as it can be seen that occur to initiate to call in LTE network in user equipment, and the user equipment has been in ring shape
State and do not receive called subscriber equipment answer instruction or when hanging up instruction, user equipment can currently exhaling call link
It is simultaneous call state corresponding to state transition to the present call state with network, to improve SRVCC under the scene
Call successful rate afterwards.
With reference to first aspect or first aspect the first possible implementation, in a fifth possible implementation,
Occur to show incoming call prompting in LTE network in user equipment when switching, and does not start to answer or do not receive calling subscriber equipment
When hanging up instruction, if the present call state of 2G or 3G network be call received state, the simultaneous call state be exhale
It is reception state, and above-mentioned execution call flows include: to wait user to issue to answer instruction；If 2G or 3G network are worked as
Preceding call state is to hang up instruction state, then the simultaneous call state hangs up instruction state to be described, and at above-mentioned execution calling
Reason process includes: to carry out the operating process of end of calling.By the 5th kind of possible implementation of first aspect as it can be seen that when switching hair
It is raw to show incoming call prompting in LTE network in user equipment, and do not start to answer or do not receive calling subscriber equipment hangs up finger
When showing, user equipment can move to the present call state of call link same corresponding to the present call state with network
Call state is walked, to improve the call successful rate under the scene after SRVCC.
With reference to first aspect or first aspect the first possible implementation, in a sixth possible implementation,
When switching occurs in communication process, or the correspondent user device in communication process occurs and has been hung up phone and this end subscriber
Equipment does not receive also when hanging up instruction；If the present call state of 2G or 3G network is on-state, the simultaneous call state
For the on-state, and above-mentioned execution call flows include: into talking state；If the active calls of 2G or 3G network
State is to hang up instruction state, then the simultaneous call state is to hang up instruction state, and the execution call flows include:
Carry out the operating process of end of calling.By the 6th kind of possible implementation of first aspect as it can be seen that when switching occurs conversing
Cheng Zhong, or occur correspondent user device has been hung up phone in communication process and this end user device does not receive also and hangs up finger
When showing, user equipment can move to the present call state of call link same corresponding to the present call state with network
Call state is walked, to improve the call successful rate under the scene after SRVCC.
Second aspect of the present invention provides a kind of method of call treatment, and the call link that this method is applied to user equipment exists
During long term evolution LTE network is switched to 2G or 3G network, this method comprises: when the call link of user equipment is by long-term
When evolution LTE network is switched to 2G or 3G network and realizes single wireless voice calling continuity SRVCC handoff functionality, 2G or 3G
The network equipment in network inquires the present call state of the call link；The network equipment is according to the active calls of call link
The present call state of the network equipment is moved to simultaneous call corresponding to the present call state with the call link by state
State；The network equipment executes call flows in the call link according to simultaneous call state.It can by second aspect
See, the network equipment can first inquire the present call state of the call link of user equipment, according to the active calls of call link
The call state of state transition 2G or 3G network, to make call state phase of the call state of 2G or 3G network with user equipment
Unanimously, it realizes that call state is synchronous, therefore substantially increases the call successful rate after SRVCC.
In conjunction with second aspect, in the first possible implementation, the step in second aspect: network equipment inquiry is exhaled
The present call state for being link may include: the network equipment to user equipment transmission status request message, which asks
The instruction TI value that the call link is carried in message is sought, to indicate that the network equipment needs to inquire the calling to the user equipment
The present call state of link；The network equipment receives the present call state for the call link that user equipment is sent.One user
Equipment might have several call links in a period of time, and each call link uniquely corresponds to a TI value, and one is exhaled
Cry the present call state of the network of link there is usually one.By second aspect, the first possible implementation is as it can be seen that net
Network equipment sends the TI value of call link to user equipment, so as to ensure that user equipment can accurately search the TI value institute
The current state of corresponding call link.
Third aspect present invention provides the device that call treatment is used in a kind of user equipment, which is configured reality
The function of method provided by existing above-mentioned first aspect or any optional implementation of first aspect, it is soft by software realization
Part includes unit corresponding with above-mentioned function, and unit corresponding with above-mentioned function may include receiving unit, processing unit and hair
Send unit, the receiving unit, processing unit and transmission unit communication connection, receiving unit for realizing correspondingly received function,
Transmission unit is for realizing the function of accordingly sending, and processing unit is for realizing respective treated function.
Fourth aspect present invention provides the device that call treatment is used in the network equipment in a kind of 2G or 3G network, at this
Reason device is configured to realize the function of method provided by above-mentioned second aspect or any optional implementation of second aspect, by
Software realization, software include unit corresponding with above-mentioned function, unit corresponding with above-mentioned function may include receiving unit,
Processing unit and transmission unit, the receiving unit, processing unit and transmission unit communication connection, receiving unit is for realizing corresponding
Received function, transmission unit is for realizing the function of accordingly sending, and processing unit is for realizing respective treated function.
Fifth aspect present invention provides a kind of user equipment, which is configured to realize above-mentioned first aspect or first
The function of method provided by any optional implementation of aspect, by hardware realization, hardware includes corresponding to above-mentioned function
Device, device corresponding with above-mentioned function may include transceiver, processor and memory, the transceiver, the processor
It is connected with the memory by bus, memory executes the program of call treatment for storage processor, and transceiver is for real
Now corresponding transmission-receiving function, processor is for realizing corresponding processing function.
Sixth aspect present invention provides the network equipment in a kind of 2G or 3G network, which is configured to realize above-mentioned
The function of method provided by second aspect or any optional implementation of second aspect, by hardware realization, hardware includes
Device corresponding with above-mentioned function, device corresponding with above-mentioned function may include transceiver, processor and memory, the transmitting-receiving
Device, the processor and the memory are connected by bus, and memory executes the program of call treatment for storage processor,
Transceiver is for realizing corresponding transmission-receiving function, and processor is for realizing corresponding processing function.
Seventh aspect present invention provides a kind of computer storage medium, which is stored with above-mentioned first party
The program of the call treatment of face or any optional implementation of first aspect.
Eighth aspect present invention provides a kind of computer storage medium, which is stored with above-mentioned second party
The program of the call treatment of face or any optional implementation of second aspect.
Ninth aspect present invention provides a kind of system of call treatment, the dress including call treatment described in the third aspect
Set or fourth aspect described in call treatment device.
Tenth aspect present invention provides a kind of system of call treatment, including user equipment described in the 5th aspect or
The network equipment described in 6th aspect.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those skilled in the art, without creative efforts, it can also be obtained according to these attached drawings other attached
Figure.
Fig. 1 is a structural schematic diagram of communication network；
Fig. 2 is an embodiment schematic diagram of the method for call treatment in the embodiment of the present invention；
Fig. 3 is another embodiment schematic diagram of the method for call treatment in the embodiment of the present invention；
Fig. 4 is another embodiment schematic diagram of the method for call treatment in the embodiment of the present invention；
Fig. 5 is another embodiment schematic diagram of the method for call treatment in the embodiment of the present invention；
Fig. 6 is another embodiment schematic diagram of the method for call treatment in the embodiment of the present invention；
Fig. 7 is another embodiment schematic diagram of the method for call treatment in the embodiment of the present invention；
Fig. 8 is another embodiment schematic diagram of the method for call treatment in the embodiment of the present invention；
Fig. 9 is an embodiment schematic diagram of the device of call treatment in the embodiment of the present invention；
Figure 10 is an embodiment schematic diagram of communication equipment in the embodiment of the present invention.
Specific embodiment
The embodiment of the present invention provides a kind of method of call treatment, the call successful rate after being able to ascend SRVCC.The present invention
Embodiment additionally provides corresponding device, equipment and system.It is described in detail separately below.
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those skilled in the art's every other implementation obtained without creative efforts
Example, shall fall within the protection scope of the present invention.
As shown in Figure 1, current communication network includes global system for mobile communications (the Global System of second generation 2G
For Mobile Communication, GSM) network, third generation 3G Universal Mobile Communication System (Universal Mobile
Telecommunications System, UMTS) network and long term evolution (Long Term Evolution, LTE) network
Deng.In LTE network overlay area, user equipment (User Equipment, UE) is based on LTE and IP multimedia subsystem (IP
Multimedia Subsystem, IMS) realize voice service, due to LTE network limited coverage area, when user equipment is moving
Out when LTE network coverage area, ongoing voice service will be switched to the circuit switching (Circuit of 2G/3G network
Switched, CS) domain, to guarantee the continuity of audio call, and guarantee the continuity of call in communication process, draws
The function of single wireless voice calling continuity (Single Radio Voice Call Continuity, SRVCC) is entered.
For a user equipment in LTE network, when in LTE network coverage area, UE is divided by evolution
Network registry is to IMS core net for group core net (Evolved Packet Core, EPC), and in calling procedure, signaling passes through EPC
Network is sent to the processing and network connection that IMS core net completes signaling.
When the mobile management entity (Mobility Management Entity, MME) in EPC network detects that LTE believes
Number weaken, in the case that user equipment needs to be switched to the domain CS in 2G or 3G network to guarantee Session continuity, set in user
Standby to be switched to after the domain CS, which carries out voice service as the normal domain CS user.
In the prior art after SRVCC switching occurs, and switches successfully, user equipment is to the processing mode of call flow
It is carried out under the premise of the call state of the call state of default UE and network is consistent, but the call state of actually network can
Can be inconsistent with the call state of user, the call successful rate after thus will affect SRVCC.Such as: the call state of UE is
(DIALING) state of SRVCC occurs just in calling procedure, but the call state of network has been ring (ALERTING)
State, then UE will wait the ALERTING message less than network under the domain CS and automatically hang up phone.Such as UE is exhaled again
Being state is (ACTIVING) state of the SRVCC just occurred in communication process, but the call state of network has arrived
(ACTIVE) state that phone has been turned on, then UE can retransmit connection (CONNECT) message, Ke Nengyou in the domain CS to network
A little networks are these CONNECT message that will not be handled, then caused result is exactly UE etc. less than connection reply
(CONNECT ACK) message and automatically hang up phone.
Therefore, in current network, since the call state of the call state and 2G or 3G network of UE is inconsistent, cause
Phone after SRVCC successful switch to the domain CS can not successfully continue, the call successful rate after affecting SRVCC.
Therefore, the embodiment of the present invention provides a kind of communication system, which includes user equipment and the network equipment, uses
Family equipment can be the mobile terminal that mobile phone and phone wrist-watch etc. can make a phone call.The network equipment may include joining in IMS network
The equipment of the domain CS service can be provided with the equipment and 2G or 3G network of SRVCC switching.The schematic diagram of the communication system can join
Fig. 1 is read to be understood.
Based on the communication system, referring to Fig.2, the embodiment of the present invention provides a kind of method of call treatment, the call treatment
Method may include:
101, when the call link of user equipment is switched to 2G or 3G network by long term evolution LTE network and realizes single nothing
When line continuous voice call SRVCC handoff functionality, which inquires the present call state of 2G or 3G network, 2G or 3G
The present call state of network corresponds to the call link.
102, the user equipment is according to the 2G or the present call state of 3G network, by the current of the call link
Call state moves to and simultaneous call state corresponding to the present call state of the 2G or 3G network.
103, the user equipment executes call treatment stream according to the simultaneous call state in the call link
Journey.
The method of call treatment provided in an embodiment of the present invention, user equipment can first inquire 2G or the current of 3G network exhales
It is state, according to the call state of the present call state migrated users equipment of 2G or 3G network, to make exhaling for user equipment
It makes state consistent with the call state of network, it is synchronous to realize call state, therefore substantially increase the access success after SRVCC
Rate.
Wherein, optionally, the user equipment inquires the present call state of 2G or 3G network, may include:
The network equipment of the user equipment into the 2G or 3G network sends status request message, the status request
The instruction TI value of the call link is carried in message, to indicate that the user equipment needs inquiry and institute to the network equipment
State the present call state of the corresponding 2G of call link or 3G network；
The user equipment receives the present call state of the 2G that the network equipment is sent or 3G network.
For ease of description, it in following multiple embodiments, is all carried out with the present call state of user equipment inquiry network
Then state synchronized is illustrated for execution call flows, set in fact, being also possible to network equipment inquiry user
Then standby present call state carries out the state synchronized of network side, execute call flows, SRVCC equally can be improved
Call successful rate afterwards.
Refering to Fig. 3, the method for call treatment provided in an embodiment of the present invention may include:
201, user equipment and the network equipment carry out the voice service based on LTE.
202, when the call link of user equipment needs to be switched to 2G or 3G network, the network equipment controls the call link
SRVCC switching is carried out, the domain CS of 2G or 3G network is switched to from LTE network.
203, user equipment successfully falls back to 2G or 3G.
204, user equipment sends status request message to the network equipment, carries call link in the status request message
Indicate TI value, with to the network equipment indicate the user equipment need to inquire the 2G corresponding with the call link or
The present call state of 3G network.
TI value is used to indicate current call link, and a user equipment can support a few road calls, every road simultaneously
Call can correspond to a TI value, such as: when mobile phone is being conversed, and there is other phone incoming call all the way, then conversing
The TI value of this call link can be 1, in addition the TI value of the call link of phone incoming call can be with for 2 all the way, such net
Network equipment is assured that user equipment will search the 2G of which call link or the present call state of 3G network using TI value.
Certainly, supported call link is not limited to the two simultaneously for user equipment, can have it is multiple, no matter have it is several, each
Call link can all have a unique corresponding TI value.
2G or 3G network equipment according to TI value determine the TI value corresponding to call link network present call state after,
The present call state by the 2G or 3G network is needed to be transferred to user equipment, the call state of usual each network can correspond to
Bit value, as long as transfer ratio paricular value during transmission.Therefore can establish network call state and bit value it
Between corresponding relationship, by way of table indicate for example: as shown in table 1.
Table 1: the corresponding relationship between the call state and bit value of network
Wherein, N indicates network, call control state (call control of the NO-null to N28 in 24008 agreements
State) chapters and sections are described later in detail, and can be managed refering to the description in the call control state chapters and sections in 24008 agreements
Solve each call state.Such as: NO-null indicates that idle state, MM indicate mobile management (mobile mangement), and CC is indicated
Call- Control1 (call control).
As shown in table 1, if the present call state of 2G or 3G network is N8-connection request connect request, that
2G or 3G network equipment only need to send 001000 to user equipment.User equipment side also can store shown in table 1
Corresponding relationship, therefore, after user equipment receives 001000, so that it may determine network present call state be N8-connection
Request connect request.
Above-mentioned table 1 is the mapping table for the present call state that the network equipment determines 2G or 3G network according to TI value, such as
Fruit is the TI value that user equipment receives network equipment transmission, and user equipment determines searched call link according to the TI value
Present call state can be understood refering to the corresponding relationship for example between the call state and bit value of 2 user equipment of table.
Table 2: the corresponding relationship between the call state and bit value of user equipment
U indicates user equipment, call control state (call control of the UO-null to U27 in 24008 agreements
State) chapters and sections are described later in detail, and can be managed refering to the description in the call control state chapters and sections in 24008 agreements
Solve each call state.Such as: UO-null indicates that idle state, MM indicate mobile management (mobile mangement), and CC is indicated
Call- Control1 (call control).
205, the network equipment in 2G or 3G network returns to the present call state of 2G or 3G network to user equipment.
206, user equipment is according to the 2G or the present call state of 3G network, by the active calls of the call link
State transition to simultaneous call state corresponding to the present call state of the 2G or 3G network.
Can store in user equipment under a series of different call communication scenes, the call state of 2G or 3G network with
The corresponding relationship of simultaneous call state, the present call state of user equipment indicate current call communication environment.The correspondence is closed
System can be indicated by way of table, such as: be that incoming call occurs in the ims network shown in table 3, user click connect
Listen, UE to network send connection CONNECT message, but do not receive also network connection confirmation CONNECT ACK message when
Scene, correspondence table under the scene can be with are as follows:
Table 3: the corresponding relationship of the simultaneous call state of the call state and UE of network
| The call state of network | The simultaneous call state of UE |
| N7-call received | U8-connect request |
| N10-active | U10-active |
| N8-connect request | U8-connect request |
And the call communication scene description of the corresponding relationship of the simultaneous call state of the call state and UE for network
It can be described with UE current call state.
The state synchronized of user equipment after receiving the present call state of network about user equipment can be refering to Fig. 4
Several embodiments to Fig. 8 are understood.
207, user equipment executes call flows in the call link according to simultaneous call state.
UE synchronize after simultaneous call state when being U8-connect request, then UE can be executed and U8-
The corresponding call flows of connect request.
The method of call treatment provided in an embodiment of the present invention, user equipment can first inquire 2G or the current of 3G network exhales
It is state, according to the call state of the synchronous UE of the present call state of 2G or 3G network, to make the call state and network of UE
Call state it is consistent, realize that call state is synchronous, therefore substantially increase the call successful rate after SRVCC.
Refering to Fig. 4, another embodiment of the method for call treatment provided in an embodiment of the present invention includes:
301, when incoming call occurs in the ims network, user clicks and answers, and UE sends connection CONNECT to network
Message, but SRVCC switching constantly occurs for the connection confirmation CONNECT ACK message for not receiving network also.
Step 302 to 307 with step 202 to 207 identical, it is no longer repeated herein.
When user answers IMS incoming call, UE sends CONNECT message to the network equipment, but does not receive network also
During CONNECT ACK message, after SRVCC is switched to 2G or 3G network, UE inquires working as 2G or 3G network according to TI value
Preceding call state.
If the present call state for inquiring 2G or 3G network is call received (N7) call received state, that
It can determine that simultaneous call state is connection request state, state transition to connection request connect request (U8) shape
State.And the execution call flows include: that so UE sends connect message to 2G or 3G network in the domain CS again.
If the present call state for inquiring 2G or 3G network is active (N10) on-state, then can determine same
Walking call state is on-state active (U10), state transition to active (U10), and the execution call flows
Include: no longer to send CONNECT message to network, enters talking state.
If the present call state for inquiring 2G or 3G network is in connect request (N8) connection request, then
It can determine that simultaneous call state is connect request (U8) state, state transition to connect request (U8) shape
State, and the call flows that execute include: to wait the reply of the connect ack of network, are no longer sent to network
Connect message.
Refering to Fig. 5, another embodiment of the method for call treatment provided in an embodiment of the present invention includes:
401, IMS is initiated in UE when switching generation to call, that is, initiate to call in LTE network, and sent invitation
INVITE is to the network equipment in the 2G or 3G network, and when not receiving the 180 of the network equipment and replying.
Step 402 to 407 with step 202 to 207 identical, it is no longer repeated herein.
After SRVCC is switched to 2G or 3G network, UE inquires the present call state of 2G or 3G network according to TI value.
If the present call state for inquiring 2G or 3G network is null (NO), the simultaneous call state is the sky
Not busy state, and the execution call flows include: that prompt is hung up in execution；If or the active calls shape of the 2G or 3G network
State is idle state, then the simultaneous call state is mobile management MM connection status, and the execution call flows packet
It includes: sending call request to the network equipment again；That is, if the present call state for inquiring 2G or 3G network is
Null (NO) notifies user's end of calling either to initiate call request to network, such as in the domain CS again then UE can choose
Fruit notifies user's end of calling, then state transition is to null (UO) state, if giving network to send out call request, shape again
State moves in MM connection pending (U0.1) MM connection procedure.
If the present call state for inquiring 2G or 3G network is that call initiated (N1) calls initiation state, institute
Stating simultaneous call state is the calling initiation state, then the state transition of UE is to callinitiated (U1) state, and institute
Stating and executing call flows includes: to wait the call proceeding message of network.
If the present call state for inquiring network is that call proceeding (N3) calls carry out state, described same
It walks call state and is that the calling carries out state, then the state transition of UE is to call proceeding (U3) state, and described
Executing call flows includes: the alerting ALERTING message for waiting network.
Refering to Fig. 6, another embodiment of the method for call treatment provided in an embodiment of the present invention includes:
501, it initiates to call when in UE initiation IMS calling, that is, in LTE network, the caller state of current IMS has been
ALERTING ringing condition, and generation SRVCC switching when answering instruction or hanging up instruction of called subscriber equipment is not received.
Step 502 to 507 with step 202 to 207 identical, it is no longer repeated herein.
The state of caller is alerting after called ring, and called subscriber does not answer also or called subscriber
It is answered still caller and does not receive the called instruction answered also, or called still caller of hanging up the telephone does not receive also and hangs up finger
Show, SRVCC occurs, after SRVCC is switched to 2G or 3G network, UE inquires the present call state of 2G or 3G network according to TI value.
If the present call state for inquiring 2G or 3G network is that call delivered (N4) calling has issued state,
The simultaneous call state is that the calling has issued state, then the state transition of UE is to call delivered (U4) shape
State, and the call flows that execute include: to wait the network equipment in the 2G or 3G network to issue to answer instruction.
If the present call state for inquiring 2G or 3G network is on-state active (N10), the simultaneous call
State is the on-state, then the state transition of UE is to active (U10) state, and the execution call flows packet
It includes: entering talking state.
If the present call state for inquiring 2G or 3G network is to hang up instruction state disconnect indication
(N12) instruction is hung up, then the simultaneous call state hangs up instruction state to be described, then the state transition of UE is arrived
Disconnect indication (U12) state, and the call flows that execute include: to carry out the operation of end of calling
Process.
Refering to Fig. 7, another embodiment of the method for call treatment provided in an embodiment of the present invention includes:
601, it when showing incoming call prompting in the LTE network in the user equipment, is called and also receives incoming call prompting, but
It is that called subscriber does not have started generation SRVCC switching when answering.
Step 602 to 607 with step 202 to 207 identical, it is no longer repeated herein.
After user receives the incoming call instruction of IMS, do not have started answer or calling subscriber has hung up the telephone but it is called
It does not receive also and hangs up instruction, SRVCC switching just occurs, after SRVCC is switched to 2G or 3G network, UE inquires network according to TI value
Present call state.
If the present call state for inquiring 2G or 3G network is call received (N7), the simultaneous call shape
State is the call received state, then the state transition of UE is to call received (U7) state, and described executes calling
Process flow includes: to wait user to issue to answer instruction.
If the present call state for inquiring 2G or 3G network is to hang up instruction state disconnect indication
(N12), then the simultaneous call state be it is described hang up instruction state, then the state transition of UE is to disconnect
Indication (U12) state, and the call flows that execute include: to carry out the operating process of end of calling.
Refering to Fig. 8, another embodiment of the method for call treatment provided in an embodiment of the present invention includes:
701, in communication process, or occur that correspondent user device has been hung up phone in communication process and local terminal is used
Family equipment, which does not receive also, occurs SRVCC switching when hanging up instruction.
702 to 707 with step 202 to 207 identical, it is no longer repeated herein.
During calling and called IMS telephone relation or a side hangs up the telephone in communication process and another party does not receive extension also
Severed finger shows, SRVCC switching just occurs, and after SRVCC is switched to 2G or 3G network, UE inquires the active calls shape of network according to TI value
State.
If the present call state for inquiring 2G or 3G network is on-state active (N10), the simultaneous call
State is the on-state, then the state transition of UE is to active (U10) state, and the execution call flows packet
It includes: entering talking state.
If the present call state for inquiring 2G or 3G network is to hang up instruction state disconnect indication
(N12), then the simultaneous call state be it is described hang up instruction state, then the state transition of UE is to disconnect
Indication (U12) state, and the call flows that execute include: to carry out the operating process of end of calling.
In various embodiments of the present invention, the SRVCC switching after the completion of, user equipment active inquiry 2G or 3G network are current
Call state, and subsynchronous a, use is done according to the call state of the call link of G or 3G network current call state and UE
More accurate call state controls the process in the subsequent domain CS, to improve the success rate of the calling after SRVCC.
It is all that the angle for executing call treatment from user equipment is described in above-described embodiment, in fact, can also be with
It is that the network equipment executes the call treatment synchronous with user equipment.The packet when executing the call treatment of the synchronization by the network equipment
It includes:
When the call link of user equipment is switched to 2G or 3G network by long term evolution LTE network and realizes single wireless language
When voice call continuity SRVCC handoff functionality, the network equipment in the 2G or 3G network inquires the current of the call link
Call state；
The network equipment is according to the present call state of the call link, by the active calls shape of the network equipment
State moves to and simultaneous call state corresponding to the present call state of the call link；
The network equipment executes call flows in the call link according to the simultaneous call state.
Wherein, the network equipment inquires the present call state for being link, may include:
The network equipment sends status request message to the user equipment, in the status request message described in carrying
The instruction TI value of call link, to indicate that the network equipment needs to inquire the current of the call link to the user equipment
Call state；
The network equipment receives the present call state for the call link that the user equipment is sent.
When executing the process of above-mentioned call treatment by the network equipment, the calling of network and user equipment equally may be implemented
State synchronized, the call successful rate after improving SRVCC.The synchronizing process of specific various call states and user equipment before
Performed method flow is similar, does not repeat herein.
In addition, the embodiment of the invention also provides the devices for the method for realizing above-mentioned call treatment.
An embodiment packet refering to Fig. 9, in user equipment provided in an embodiment of the present invention for the device 80 of call treatment
It includes:
Query unit 801 is switched to 2G or 3G by long term evolution LTE network for the call link when the user equipment
Network and when realizing single wireless voice calling continuity SRVCC handoff functionality, inquires the active calls of the 2G or 3G network
The present call state of state, the 2G or 3G network corresponds to the call link；
Migration units 802, the active calls shape of the 2G or 3G network for being inquired according to the query unit 801
State, by the present call state of the call link move to it is same corresponding to the present call state of the 2G or 3G network
Walk call state；
Call processing unit 803, for migrating obtained simultaneous call state according to the migration units 802, described
Call flows are executed in call link.
In user equipment provided in an embodiment of the present invention be used for call treatment device, user equipment can first inquire 2G or
The present call state of 3G network, according to the calling shape of synchronous the inquired call link of the present call state of 2G or 3G network
State realizes shape to make in the call link that the call state of user equipment is consistent with the call state of 2G or 3G network
State is synchronous, therefore substantially increases the call successful rate after SRVCC.
The query unit 801 further include:
Transmission unit 8011 sends status request message, the shape for the network equipment into the 2G or 3G network
The instruction TI value of the call link is carried in state request message, to indicate that the user equipment needs are looked into the network equipment
Ask the present call state of the 2G corresponding with the call link or 3G network；
Receiving unit 8012, for receiving the present call state of the 2G or 3G network that the network equipment is sent.
Furthermore it is also possible to refering to Fig. 9, for calling in the network equipment in 2G or 3G network provided in an embodiment of the present invention
In another embodiment of the device 80 of processing,
Query unit 801 is switched to the 2G or 3G by long term evolution LTE network for the call link when user equipment
Network and when realizing single wireless voice calling continuity SRVCC handoff functionality, inquires the active calls shape of the call link
State；
Migration units 802, the present call state of the call link for being inquired according to the query unit 802,
By the present call state of the network equipment move to corresponding to the present call state of the user equipment synchronize exhale
It is state；
Call processing unit 803, for migrating obtained simultaneous call state according to the migration units 802, described
Call flows are executed in call link.
The query unit 801 includes:
Transmission unit 8011 is taken in the status request message for sending status request message to the user equipment
Instruction TI value with the call link, to indicate that the network equipment needs to inquire the call link to the user equipment
Present call state；
Receiving unit 8012, for receiving the present call state for the call link that the user equipment is sent.
Further, the user equipment in above-described embodiment or the call treatment in the network equipment in 2G or 3G network
Device can be in the form of functional module and present.Here " module " can refer to application-specific integrated circuit
(application-specific integrated circuit, ASIC), circuit execute one or more softwares or firmware
The processor and memory of program, integrated logic circuit and/or other device of above-mentioned function can be provided.It is simple at one
Embodiment in, each module can also be realized by the communication equipment 800 in Figure 10.
The communication equipment 800 can be the network equipment in user equipment or 2G or 3G network.Figure 10 is of the invention real
A kind of communication apparatus construction schematic diagram of example offer is provided.The communication equipment 800 can generate bigger because of configuration or performance difference
Difference, may include one or more central processing unit (central processing units, CPU) 822 (examples
Such as, one or more processors), transceiver 860, memory 832, one or more storage application programs 842 or
The storage medium 830 (such as one or more mass memory units) of data.Wherein, memory 832 can be by volatibility
Storage medium is constituted, and storage medium 830 can be made of non-volatile memory medium.The program for being stored in storage medium 830 can
To include that one or more modules realize (diagram does not mark), each module may include to a series of in communication equipment
Instruction operation.Further, central processing unit 822 can be set to communicate with storage medium 830, on communication equipment 800
The series of instructions operation stored in storage medium 830 is executed, such as operating system 841 and the corresponding instruction of application program 842.
Communication equipment 800 can also include one or more power supplys 826, one or more wired or wireless nets
Network interface 850.Storage medium 830 may include one or more operating systems 841, such as Windows ServerTM, Mac
OS XTM, UnixTM, LinuxTM, FreeBSDTM etc., storage medium 830 can also include application program 842.Operating system
841 and application program 842 be run in memory 832.
Step performed by user equipment or the network equipment can be based on the communication shown in Fig. 10 in above-described embodiment
Device structure.
Processor 820 executes program instructions, for making communication equipment execute user in embodiment corresponding to Fig. 2 to Fig. 8
Method performed by equipment or the network equipment.
It is apparent to those skilled in the art that for convenience and simplicity of description, the storage of foregoing description
The specific work process of system, apparatus, and unit, can refer to corresponding processes in the foregoing method embodiment, no longer superfluous herein
It states.
In several embodiments provided herein, it should be understood that disclosed system, device and method can be with
It realizes by another way.For example, apparatus embodiments described above are merely indicative, for example, the unit
It divides, only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple units or components
It can be combined or can be integrated into another system, or some features can be ignored or not executed.Another point, it is shown or
The mutual coupling, direct-coupling or communication connection discussed can be through some interfaces, the indirect coupling of equipment or unit
It closes or communicates to connect, can be electrical property, mechanical or other forms.
It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.Above-mentioned integrated list
Member both can take the form of hardware realization, can also realize in the form of software functional units.
If the integrated unit is realized in the form of SFU software functional unit and sells or use as independent product
When, it can store in a computer readable storage medium.Based on this understanding, technical solution of the present invention is substantially
The all or part of the part that contributes to existing technology or the technical solution can be in the form of software products in other words
It embodies, which is stored in a storage medium, including some instructions are used so that a computer
Equipment (can be personal computer, server or the network equipment etc.) executes the complete of each embodiment the method for the present invention
Portion or part steps.And storage medium above-mentioned includes: USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only
Memory), random access memory (RAM, Random Access Memory), magnetic or disk etc. are various can store journey
The medium of sequence code.
The method, apparatus, equipment and system for being provided for the embodiments of the invention call treatment above have carried out in detail
It introduces, used herein a specific example illustrates the principle and implementation of the invention, the explanation of above embodiments
It is merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art, according to this
The thought of invention, there will be changes in the specific implementation manner and application range, in conclusion the content of the present specification is not answered
It is interpreted as limitation of the present invention.
Claims (17)
1. a kind of method of call treatment characterized by comprising
When the call link of user equipment is switched to 2G or 3G network by long term evolution LTE network and realizes that single wireless voice is exhaled
When being continuity SRVCC handoff functionality, the user equipment inquires the present call state of the 2G or 3G network, the 2G or
The present call state of 3G network corresponds to the call link；
The user equipment is according to the 2G or the present call state of 3G network, by the present call state of the call link
It moves to and simultaneous call state corresponding to the present call state of the 2G or 3G network；
The user equipment executes call flows in the call link according to the simultaneous call state.
2. the method according to claim 1, wherein the user equipment inquires the current of the 2G or 3G network
Call state, comprising:
The network equipment of the user equipment into the 2G or 3G network sends status request message, the status request message
The middle instruction TI value for carrying the call link is exhaled with indicating that the user equipment needs to inquire to the network equipment with described
It is the present call state of the corresponding 2G of link or 3G network；
The user equipment receives the present call state of the 2G that the network equipment is sent or 3G network.
3. method according to claim 1 or 2, which is characterized in that when switching occurs in the user equipment in the LTE
The incoming call of network is clicked by user and is answered, and the network equipment into the 2G or 3G network sends company to the user equipment
When connecing message and not receiving the connection confirmation message of the network equipment；
If the present call state of the 2G or 3G network is call received state, the simultaneous call state is that connection is asked
State is sought, and the execution call flows include: to set in the circuit-switched CS domain of the 2G or 3G network to the network
Preparation send connection message；Or
If the present call state of the 2G or 3G network is on-state, the simultaneous call state is on-state, and
The execution call flows include: to enter talking state；Or
If the present call state of the 2G or 3G network is connection request state, the simultaneous call state is the connection
Solicited status, and the execution call flows include: to wait the reply of the connection reply of the network equipment.
4. method according to claim 1 or claim 2, which is characterized in that when switching occurs in the user equipment in the LTE net
Network initiates calling, and has sent and invited INVITE to the network equipment in the 2G or 3G network, and do not received the network and set
When standby 180 are replied；
If the present call state of the 2G or 3G network is idle state, the simultaneous call state is the idle shape
State, and the execution call flows include: that prompt is hung up in execution；Or
If the present call state of the 2G or 3G network is idle state, the simultaneous call state is mobile management MM company
State is connect, and the execution call flows include: to send call request to the network equipment again；Or
If the present call state of the 2G or 3G network is calling initiation state, the simultaneous call state is the calling
Initiation state, and the execution call flows include: to wait the call proceeding message of the network equipment；Or
If the present call state of the 2G or 3G network is calling carry out state, the simultaneous call state is the calling
Carry out state, and the execution call flows include: the ALERTING message for waiting the network equipment.
5. method according to claim 1 or 2, which is characterized in that when switching occurs in the user equipment in the LTE
Network-originated call, and the user equipment be in ringing condition and do not receive called subscriber equipment answer instruction or
When hanging up instruction,
If the present call state of the 2G or 3G network is that calling has issued state, the simultaneous call state is described exhales
It is the state of sending, and the call flows that execute include: to wait the network equipment in the 2G or 3G network to issue to connect
Listen instruction；Or
If the present call state of the 2G or 3G network is on-state, the simultaneous call state is the connection shape
State, and the execution call flows include: into talking state；Or
If the present call state of the 2G or 3G network is to hang up instruction state, the simultaneous call state is described hangs up
Instruction state, and the call flows that execute include: to carry out the operating process of end of calling.
6. method according to claim 1 or 2, which is characterized in that when switching occurs in the user equipment in the LTE
Network shows incoming call prompting, and does not start to answer or do not receive when hanging up instruction of calling subscriber equipment,
If the present call state of the 2G or 3G network is call received state, the simultaneous call state is described exhales
It is reception state, and the execution call flows include: to wait user to issue to answer instruction；Or
If the present call state of the 2G or 3G network is to hang up instruction state, the simultaneous call state is described hangs up
Instruction state, and the call flows that execute include: to carry out the operating process of end of calling.
7. method according to claim 1 or 2, which is characterized in that occur in communication process when switching, or occur to exist
Correspondent user device has been hung up phone in communication process and this end user device does not receive also when hanging up instruction,
If the present call state of the 2G or 3G network is on-state, the simultaneous call state is the connection shape
State, and the execution call flows include: into talking state；Or
If the present call state of the 2G or 3G network is to hang up instruction state, the simultaneous call state is described hangs up
Instruction state, and the call flows that execute include: to carry out the operating process of end of calling.
8. a kind of method of call treatment characterized by comprising
When the call link of user equipment is switched to 2G or 3G network by long term evolution LTE network and realizes that single wireless voice is exhaled
When being continuity SRVCC handoff functionality, the network equipment in the 2G or 3G network inquires the active calls of the call link
State；
The network equipment moves the present call state of the network equipment according to the present call state of the call link
It moves on to and simultaneous call state corresponding to the present call state of the call link；
The network equipment executes call flows in the call link according to the simultaneous call state.
9. according to the method described in claim 8, it is characterized in that, the network equipment inquires currently exhaling for the call link
It is state, comprising:
The network equipment sends status request message to the user equipment, carries the calling in the status request message
The instruction TI value of link, to indicate that the network equipment needs to inquire the active calls of the call link to the user equipment
State；
The network equipment receives the present call state for the call link that the user equipment is sent.
10. being used for the device of call treatment in a kind of user equipment characterized by comprising
Query unit is switched to 2G or 3G network simultaneously by long term evolution LTE network for the call link when the user equipment
When realizing single wireless voice calling continuity SRVCC handoff functionality, the present call state of the 2G or 3G network, institute are inquired
The present call state for stating 2G or 3G network corresponds to the call link；
Migration units, the present call state of the 2G or 3G network for being inquired according to the query unit, are exhaled described
The present call state of link is made to move to and simultaneous call state corresponding to the present call state of the 2G or 3G network；
Call processing unit, the simultaneous call state for being migrated according to the migration units, in the call link
Execute call flows.
11. device according to claim 10, which is characterized in that the query unit includes:
Transmission unit sends status request message for the network equipment into the 2G or 3G network, and the status request disappears
The instruction TI value of the call link is carried in breath, with to the network equipment indicate the user equipment need to inquire with it is described
The present call state of the corresponding 2G of call link or 3G network；
Receiving unit, for receiving the present call state of the 2G or 3G network that the network equipment is sent.
12. being used for the device of call treatment in the network equipment in a kind of 2G or 3G network, which is characterized in that described device packet
It includes:
Query unit is switched to the 2G or 3G network simultaneously by long term evolution LTE network for the call link when user equipment
When realizing single wireless voice calling continuity SRVCC handoff functionality, the present call state of the call link is inquired；
Migration units, the present call state of the call link for being inquired according to the query unit, by the network
The present call state of equipment moves to and simultaneous call state corresponding to the present call state of the call link；
Call processing unit, the simultaneous call state for being migrated according to the migration units, in the call link
Execute call flows.
13. device according to claim 12, which is characterized in that the query unit includes:
Transmission unit is exhaled described in carrying in the status request message for sending status request message to the user equipment
It is the instruction TI value of link, to indicate that the network equipment needs to inquire currently exhaling for the call link to the user equipment
It is state；
Receiving unit, for receiving the present call state for the call link that the user equipment is sent.
14. a kind of user equipment characterized by comprising transceiver, processor and memory, the transceiver, the processing
Device is connected with the memory by bus；
Wherein, the memory is used to store the program that the processor executes call treatment；
The processor is for executing following steps under the driving of described program:
When the call link of user equipment is switched to 2G or 3G network by long term evolution LTE network and realizes that single wireless voice is exhaled
When being continuity SRVCC handoff functionality, inquire the present call state of the 2G or 3G network, the 2G or 3G network it is current
Call state corresponds to the call link；
According to the 2G or the present call state of 3G network, by the present call state of the call link move to it is described
Simultaneous call state corresponding to the present call state of 2G or 3G network；
According to the simultaneous call state, call flows are executed in the call link.
15. user equipment according to claim 14, which is characterized in that
The transceiver is used for: the network equipment in Xiang Suoshu 2G or 3G network sends status request message, the status request
The instruction TI value of the call link is carried in message, to indicate that the user equipment needs inquiry and institute to the network equipment
State the present call state of the corresponding 2G of call link or 3G network；And receive the 2G that the network equipment is sent
Or the present call state of 3G network.
16. the network equipment in a kind of 2G or 3G network characterized by comprising transceiver, processor and memory, it is described
Transceiver, the processor and the memory are connected by bus；
Wherein, the memory is used to store the program that the processor executes call treatment；
The processor is for executing following steps under the driving of described program:
When the call link of user equipment is switched to the 2G or 3G network by long term evolution LTE network and realizes single wireless language
When voice call continuity SRVCC handoff functionality, the present call state of the call link is inquired；
According to the present call state of the call link, the present call state of the network equipment is moved to and is exhaled with described
It is simultaneous call state corresponding to the present call state of link；
According to the simultaneous call state, call flows are executed in the call link.
17. the network equipment according to claim 16, which is characterized in that
The transceiver is used for: Xiang Suoshu user equipment sends status request message, in the status request message described in carrying
The instruction TI value of call link, to indicate that the network equipment needs to inquire the current of the call link to the user equipment
Call state；And receive the present call state for the call link that the user equipment is sent.
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| CN109246632B (en) * | 2017-06-02 | 2021-12-21 | 展讯通信（上海）有限公司 | Call method and device, computer readable storage medium, base station and terminal |
| CN109688610B (en) * | 2017-10-18 | 2021-06-08 | 中国移动通信集团重庆有限公司 | Method, device, equipment and storage medium for switching single-standby voice continuous service |
| US10932315B2 (en) * | 2018-11-06 | 2021-02-23 | Samsung Electronics Co., Ltd. | Methods and systems for handling call establishment by user equipment in wireless communication network |
| WO2020102954A1 (en) * | 2018-11-19 | 2020-05-28 | 华为技术有限公司 | Method, apparatus and system for single radio voice call continuity (srvcc) of terminal |
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