CN107529200A - The method and device of release resource after network switching occurs for terminal in a kind of VoLTE - Google Patents
The method and device of release resource after network switching occurs for terminal in a kind of VoLTE Download PDFInfo
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- CN107529200A CN107529200A CN201610450882.0A CN201610450882A CN107529200A CN 107529200 A CN107529200 A CN 107529200A CN 201610450882 A CN201610450882 A CN 201610450882A CN 107529200 A CN107529200 A CN 107529200A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/06—Reselecting a communication resource in the serving access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/14—Reselecting a network or an air interface
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/30—Connection release
- H04W76/32—Release of transport tunnels
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Telephonic Communication Services (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses the method and device that release resource after network switching occurs for terminal in a kind of VoLTE, it is related to VoLTE fields, methods described includes：User terminal VoLTE speech businesses after legacy network switches to current network, IMS network detects whether the user terminal has the ability for removing legacy network audio call；If IMS network, which detects the user terminal, has the ability for removing legacy network audio call, IMS network discharges the audio call resource of legacy network in a manner of sending SIP signalings；If IMS network detects the user terminal discharges the audio call resource of legacy network without the ability for removing legacy network audio call, IMS network in a manner of not sending or not retransmit SIP signalings.By detecting the ability for removing legacy network audio call of user terminal, resource occupation time of the audio call to IMS network network element of legacy network is reduced.
Description
Technical field
The present invention relates to (the Voice over of the speech business based on Long Term Evolution
Long Term Evolution, VoLTE) network field, in more particularly to a kind of VoLTE eventually
The method and device of release resource after network switching occurs for end.
Background technology
In VoLTE networks, as forth generation mechanics of communication (The 4th Generation Mobile
Communication Technology, 4G) terminal passes through packet-switched domain (Packet
Switching Domain, PS) network and IP multimedia subsystem (IP Multimedia
Subsystem, IMS) after network dials voice call, if network switching occurs for terminal, pass through
With IMS network voice occurs for circuit commutative field (Circuit Switched Domain, CS) network
Call, then the network element of IMS network will be according to session initiation protocol (Session Initiation
Protocol, SIP) original calling to PS networks removes, send call release request
The SIP signaling messages such as (i.e. BYE requests) or failure response, ensure related resource release.
But now how terminal handles what is received by former PS networks after network switching occurs
SIP signaling messages, have no standard at present.The respective implementation of existing manufacturer terminal simultaneously differs
Cause, that is, the terminal having can handle the SIP signaling messages from legacy network, and some terminals are not located
Manage the SIP signaling messages from legacy network.Believe for not handling the SIP from legacy network
The terminal of message is made, the network element of IMS network stills need please to BYE according to SIP standard agreement
Ask or failure response is retransmitted, until time-out release resource after 32 seconds.Fig. 1 is current
In VOLTE networks, the workflow diagram when network switching occurs for mobile phone terminal, such as Fig. 1
Shown, step includes：
Step S101 and step S102：Terminal (such as mobile phone) is by audio call SIP request
Transmission forwards this request to current registered network, i.e. PS networks, and via PS networks
IMS network.
Step S103 and step S104：Terminal switches because registered network occurs for signal reason,
I.e. from PS network switchings to CS networks, it is necessary to audio call is switched into CS networks, now
Terminal sends handover network audio call SIP request to CS networks, and via CS networks
Forward the request to IMS network.
Step S105 and step S106：After switching, IMS network needs to discharge PS nets
The related resource of network audio call, now send call release request or failure response.
Terminal is divided into the terminal of SIP signaling messages that can be in processing step S105 and step S106
With the terminal of SIP signaling messages being unable in processing step S105 and step S106.Wherein,
For the terminal for the SIP signaling messages being unable in processing step S105 and step S106, IMS
SIP signaling messages in network meeting retransmissions steps S105 and step S106, after 32 seconds,
Agreement time-out, now increase the network burden of IMS network and PS networks, furtherly,
The resource occupation time and PS networks, the message of IMS network for adding IMS network network element are born
Load.
The content of the invention
The technical problem that the technical scheme provided according to embodiments of the present invention solves is that solve
In VoLTE networks, when network switching occurs in audio call or voice call for terminal, due to
SIP signaling message of the terminal-pair from legacy network does not handle and increases the money of VoLTE network elements
The problem of source holding time, and IMS network network element retransmit SIP signalings according to Session Initiation Protocol,
The problem of increasing whole network burden.
Terminal is released after network switching occurs in a kind of VoLTE provided according to embodiments of the present invention
The method for putting resource, including：
Terminal VoLTE speech businesses after legacy network switches to current network, IMS
Whether terminal described in network detection has the ability for removing legacy network audio call；
If the IMS network, which detects the terminal, has dismounting legacy network audio call
Ability, then the IMS network discharge the language of legacy network in a manner of sending SIP signalings
Sound call resources；
If the IMS network detects the terminal without dismounting legacy network audio call
Ability, then the IMS network in a manner of not sending or not retransmit SIP signalings, release
The audio call resource of legacy network.
Preferably, the IMS network detects whether the terminal has dismounting legacy network language
The step of ability of sound calling, includes：
The IMS network sends probe message by the legacy network to the terminal；
If the IMS network receives detection described in the terminal replies by the legacy network
The response message of message, it is determined that the terminal has the energy for removing legacy network audio call
Power.
Preferably, the IMS network detects whether the terminal has dismounting legacy network language
The step of ability of sound calling, also includes：
If the IMS network does not receive spy described in the terminal replies by the legacy network
The response message of message is surveyed, then sending detection to the terminal again by the legacy network disappears
Breath；
When the number for sending probe message to the terminal by the legacy network reaches predetermined
Number, and when not receiving corresponding response message yet, the IMS determines that the terminal does not have
There is the ability for removing legacy network audio call.
Preferably, the ability of the terminal dismounting legacy network audio call refers to that terminal-pair comes from
The disposal ability of the SIP signalings of legacy network.
Preferably, the IMS network is released in a manner of not sending or not retransmitting SIP signalings
The step of audio call resource for putting legacy network, includes：
The IMS network directly discharges the audio call resource that it is legacy network distribution, or
After person sends a SIP signaling by legacy network, the voice that it is legacy network distribution is discharged
Call resources.
Preferably, the legacy network is PS networks, and the current network is CS networks.
The storage medium provided according to embodiments of the present invention, it is stored for realizing above-mentioned VoLTE
The program of the method for resource is discharged after middle terminal generation network switching.
Terminal is released after network switching occurs in a kind of VoLTE provided according to embodiments of the present invention
The device of resource is put, including：
Ability detecting module, switch for the VoLTE speech businesses in terminal from legacy network
To current network, detect whether the terminal has the energy for removing legacy network audio call
Power；
Resource release module, legacy network audio call is removed if detecting the terminal and having
Ability, then in a manner of sending SIP signalings, the audio call resource of legacy network is discharged, it is no
Then in a manner of not sending or not retransmit SIP signalings, the audio call money of legacy network is discharged
Source.
Preferably, the ability detecting module is sent to the terminal by the legacy network and visited
Message is surveyed, if receiving the response of probe message described in the terminal replies by the legacy network
Message, it is determined that the terminal has the ability for removing legacy network audio call.
Preferably, the ability detecting module does not receive the terminal by the legacy network and returned
The response message of the multiple probe message, then send out again by the legacy network to the terminal
Probe message is sent, when the number for sending probe message to the terminal by the legacy network reaches
To pre-determined number, and when not receiving corresponding response message yet, determine the terminal without tearing open
Except the ability of legacy network audio call.
Preferably, the ability of the terminal dismounting legacy network audio call refers to that terminal-pair comes from
The disposal ability of the SIP signalings of legacy network.
Preferably, the resource release module directly discharges it and exhaled for the voice of legacy network distribution
It is resource, or after sending a SIP signaling by legacy network, it is legacy network to discharge it
The audio call resource of distribution.
Preferably, the legacy network is PS networks, and the current network is CS networks.
Technical scheme provided in an embodiment of the present invention has the advantages that：
In VoLTE networks, when IMS network by detection, determine terminal without remove
During the ability of legacy network audio call, discharged in a manner of not sending or not retransmitting SIP signalings
The audio call resource of legacy network, the network retransmission of SIP signaling messages can be not only reduced,
The burden of whole network is reduced, the audio call of legacy network can also be reduced to IMS nets
The resource occupation time of network diagram member.
Brief description of the drawings
Fig. 1 is that terminal discharges resource after network switching occurs in the VoLTE that prior art provides
Workflow diagram；
Fig. 2 is that terminal discharges after network switching occurs in VoLTE provided in an embodiment of the present invention
The method block diagram of resource；
Fig. 3 is that terminal discharges after network switching occurs in VoLTE provided in an embodiment of the present invention
The device block diagram of resource；
Fig. 4 is that terminal discharges after network switching occurs in VoLTE provided in an embodiment of the present invention
The workflow diagram of resource.
Embodiment
Below in conjunction with accompanying drawing to a preferred embodiment of the present invention will be described in detail, it will be appreciated that
Preferred embodiment described below is merely to illustrate and explain the present invention, and is not used to limit this
Invention.
Fig. 2 is that terminal discharges after network switching occurs in VoLTE provided in an embodiment of the present invention
The method block diagram of resource, as shown in Fig. 2 step includes：
Step S201：In the VoLTE speech businesses of terminal current net is switched to from legacy network
After network, whether IMS network detecting terminal has the ability for removing legacy network audio call.
Specifically, IMS network sends probe message by legacy network to terminal, if IMS
Network receives the response message of terminal replies probe message by legacy network, it is determined that terminal has
There is the ability for removing legacy network audio call；If IMS network is not received by legacy network
The response message of terminal replies probe message, then send and detect to terminal again by legacy network
Message, when the number for sending probe message to terminal by legacy network reaches pre-determined number (example
Such as 2 or 3 times), and when not receiving corresponding response message yet, IMS network determines terminal not
With the ability for removing legacy network audio call.
Step S202：IMS network is original using different strategies, release according to result of detection
The audio call resource of network.
Specifically, IMS network is according to result of detection, it is determined that for removing legacy network voice
The strategy of calling, and according to identified strategy, legacy network audio call is removed, and discharge
The audio call resource of legacy network.
Furtherly, if IMS network detects terminal and has dismounting legacy network audio call
Ability, then IMS network discharge the voice of legacy network in a manner of sending SIP signalings
Call resources.That is, IMS network is one or many to terminal transmission by legacy network
(re-transmission) SIP signalings, until terminal processes SIP signalings or 32s time-out, call release please
Ask or failure response.
Furtherly, exhaled if IMS network detects terminal without legacy network voice is removed
The ability cried, then for IMS network in a manner of not sending or not retransmit SIP signalings, release is former
There is the audio call resource of network.That is, IMS network does not send SIP signalings to terminal,
And the audio call resource that it is legacy network distribution is directly discharged, or by legacy network only
After sending a SIP signaling, the audio call resource that it is legacy network distribution is discharged.
The ability that above-mentioned terminal removes legacy network audio call refers to that terminal-pair comes from original net
The disposal ability of the SIP signalings of network.
Above-mentioned terminal can be 4G terminals, and above-mentioned legacy network can be PS networks, above-mentioned
Current network can be CS networks.
Above-mentioned SIP signalings are call release request (i.e. BYE requests) or failure response.
Wherein, if switching occurs to ask for call release in voice call stage, the SIP signalings；If
Switching occurred in the audio call stage, and the SIP signalings are failure response.
It will appreciated by the skilled person that realize whole in above-described embodiment method or
Part steps are by program the hardware of correlation can be instructed to complete, and described program can be with
Be stored in computer read/write memory medium, the program upon execution, including step S201
To step S202.Wherein, described storage medium can be ROM/RAM, magnetic disc, light
Disk etc..
Fig. 3 is that terminal discharges after network switching occurs in VoLTE provided in an embodiment of the present invention
The device block diagram of resource, as shown in figure 3, including：Ability detecting module 10 and resource release
Module 20.
Ability detecting module 10, cut for the VoLTE speech businesses in terminal from legacy network
Shift to after current network, whether detecting terminal has the energy for removing legacy network audio call
Power.Specifically, ability detecting module 10 sends probe message by legacy network to terminal,
If the response message of terminal replies probe message is received by legacy network, it is determined that terminal has
Remove the ability of legacy network audio call；If terminal replies detection is not received by legacy network
The response message of message, then probe message is sent to terminal again by legacy network, when passing through
The number that legacy network sends probe message to terminal reaches pre-determined number (such as 3 or 4 times),
And when not receiving corresponding response message yet, determine that terminal is exhaled without legacy network voice is removed
The ability cried.
Resource release module 20, for there is dismounting when ability detecting module 10 detects terminal
During the ability of legacy network audio call, in a manner of sending SIP signalings, legacy network is discharged
Audio call resource, when ability detecting module 10 detects terminal without removing original net
During the ability of network audio call, in a manner of not sending or not retransmit SIP signalings, release is original
The audio call resource of network.Specifically, resource release module 20 does not send SIP to terminal
Signaling, and the audio call resource that it is legacy network distribution is directly discharged, or by original
Network only sends a SIP signaling, then discharges its audio call money for legacy network distribution
Source.
The ability that above-mentioned terminal removes legacy network audio call refers to that terminal-pair comes from original net
The disposal ability of the SIP signalings of network.
Above-mentioned legacy network can be PS networks, and above-mentioned current network can be CS networks.
Discharging the device of resource in above-mentioned VoLTE after terminal generation network switching can be arranged on
In IMS network.
Fig. 4 is that terminal discharges after network switching occurs in VoLTE provided in an embodiment of the present invention
The workflow diagram of resource, the present embodiment is by taking the VoLTE networks of field of telecommunications as an example, terminal
(such as 4G cell phone) is in PS networks (telecommunications 4G networks), CS networks (telecommunications 2G
Network) switch after, resource is protected with the IMS network of PS, CS network connection.
Specifically, when speech network switching occurs for terminal, IMS network network element is sent to legacy network
SIP signalings detect to terminal capability, to determine whether terminal can be handled from original net
The follow-up SIP signalings of network, determine whether IMS network network element sends to legacy network and remove original
Have the SIP signaling messages of calling, so as to ensure IMS network network element and Internet resources and
When discharge.As shown in figure 4, the workflow step of the present embodiment is described as follows：
Step S301 and step S302：Terminal sends audio call SIP request to current note
Volume network, i.e. PS networks, and IMS network is forwarded this request to via PS networks.
Step S303 and step S304：Terminal because signal reason is there occurs registered network switching,
CS networks are switched to, to being switched to CS networks in requisition for by audio call, and are forwarded to IMS
Network.That is, terminal registration network is from PS network switchings to CS networks, it is necessary to will
Audio call is switched to CS networks, and now terminal sends out handover network audio call SIP request
CS networks are delivered to, and IMS network is forwarded the request to via CS networks.
Step S305 and step S306：After switching, IMS network perceives terminal
Network switching, probe message OPTIONS is sent to terminal by original PS networks.Namely
Say, after switching, IMS network is that PS networks send detection to terminal by legacy network
Message OPTIONS.
Step S307 and step S308：If IMS network receives terminal and sent by PS networks
OPTIONS response message, illustrate that the terminal can handle subsequent SIP message, i.e., its have
There is the ability for removing the calling of PS voice-over-nets.
Step S309 and step S310：IMS network sends BYE to PS networks and (discharged
Call request) or failure response, so that terminal is according to the BYE or failure response received
Respective handling is carried out, IMS network discharges the audio call resource of PS networks, and flow terminates.
The response that IMS network does not receive step S307 and the OPTIONS in step S308 disappears
Breath, illustrates that the terminal can not handle subsequent SIP message, i.e., it, which does not possess, removes PS network languages
The ability of sound calling, now, IMS network does not send or only sent once (i.e. not to the terminal
Retransmit) BYE or failure response, and discharge the audio call resource of PS networks.
Exemplified by pre-determined number to send probe message is 3 times, IMS network passes through every 1s
PS networks send probe message OPTIONS to terminal, until sending third time probe message
OPTIONS.If IMS network receives the corresponding probe message OPTIONS of terminal replies phase
Answer message, it is determined that terminal has the ability for removing legacy network audio call；If pass through
PS networks send third time probe message OPTIONS to terminal, and do not receive corresponding sound yet
Answer message, it is determined that terminal is without the ability for removing legacy network audio call.That is,
If OPTIONS request (the i.e. probe messages in terminal-pair step S305 and step S306
OPTIONS) respond, then after IMS network receives the response, judge that the terminal can be located
Sip message is managed, by the request (i.e. BYE requests) of call release or is lost by PS networks
Lose response and be sent to the terminal, flow terminates；If terminal-pair step S305 and step S306
In OPTIONS requests do not respond, then IMS network interval after 1 second, again (second
It is secondary) pass through original PS networks to terminal and send probe message OPTIONS；If terminal-pair second
The OPTIONS requests of secondary transmission respond, then after IMS network receives the response, judge
Terminal can handle sip message, by PS networks by the request of call release or failure response
Terminal is sent to, flow terminates；If second of OPTIONS request sent of terminal-pair is not done
Go out response, then IMS network interval is after 1 second, and (third time) passes through original PS networks again
Probe message OPTIONS is sent to terminal, if the OPTIONS that terminal-pair third time is sent
Request responds, then after IMS network receives the response, judges that terminal can handle SIP and disappear
Breath, terminal, flow are sent to by PS networks by the request of call release or failure response
Terminate；If the OPTIONS requests that terminal-pair third time is sent do not respond, then it is assumed that
After terminal switching, the SIP signalings of former network can not be handled, IMS network is not sent out PS networks
Send any SIP signalings or still send BYE or failure response, but without retransmitting, and
The audio call resource of original PS networks is discharged, flow terminates.The present embodiment can shift to an earlier date
Judge within 29 seconds whether terminal supports the SIP signalings of legacy network to handle after handover, can be with
Greatly reduce the resource occupation time of IMS network network element, reduce the network retransmission of SIP signalings,
The occupancy to PS networks is reduced, so that resource discharges in time.
That is, when voice call handover network occurs for terminal, IMS network network element passes through
Sip request message (such as OPTIONS) is sent to legacy network to detect terminal,
If the response of corresponding SIP request can be received by legacy network, then it is assumed that terminal can ring
The BYE or failure response of calling should be torn open, now IMS network network element is according to Session Initiation Protocol
Normal process, carry out follow-up process；If corresponding SIP request can not be received by legacy network
Response, then it is assumed that terminal can not respond the BYE or failure response for tearing calling open, now IMS
Network element implement specially treated, i.e., do not retransmit the BYE for tearing calling open or failure response to
Legacy network sends BYE or failure response but without BYE or the weight of failure response
Pass, and own resource is discharged, ensure the release of own resource, reduce network useless signaling
Transmission.
Although the present invention is described in detail above, the invention is not restricted to this, this skill
Art art personnel can carry out various modifications according to the principle of the present invention.Therefore, it is all according to
The modification that the principle of the invention is made, it all should be understood to fall into protection scope of the present invention.
Claims (12)
1. the method for release resource after network switching occurs for terminal in a kind of VoLTE, including：
Switch to and work as from legacy network in the speech business VoLTE based on Long Term Evolution of terminal
After preceding network, IP multimedia subsystem IMS network detects whether the terminal has dismounting former
There is the ability that voice-over-net calls；
If the IMS network, which detects the terminal, has dismounting legacy network audio call
Ability, then for the IMS network in a manner of sending session initiation protocol SIP signalings, release is former
There is the audio call resource of network；
If the IMS network detects the terminal without dismounting legacy network audio call
Ability, then for the IMS network in a manner of not sending or not retransmit SIP signalings, release is former
There is the audio call resource of network.
2. according to the method for claim 1, the IMS network, which detects the terminal, is
It is no that there is the step of ability for removing legacy network audio call to include：
The IMS network sends probe message by the legacy network to the terminal；
If the IMS network receives detection described in the terminal replies by the legacy network
The response message of message, it is determined that the terminal has the energy for removing legacy network audio call
Power.
3. according to the method for claim 2, the IMS network, which detects the terminal, is
It is no that there is the step of ability for removing legacy network audio call also to include：
If the IMS network does not receive spy described in the terminal replies by the legacy network
The response message of message is surveyed, then sending detection to the terminal again by the legacy network disappears
Breath；
When the number for sending probe message to the terminal by the legacy network reaches predetermined
Number, and when not receiving corresponding response message yet, the IMS network determines the terminal not
With the ability for removing legacy network audio call.
4. according to the method described in claim 1-3 any one, the terminal is removed original
The ability of voice-over-net calling refers to the processing energy of SIP signaling of the terminal-pair from legacy network
Power.
5. according to the method for claim 1, the IMS network is not to send or not weigh
The mode of SIP signalings is passed, is included the step of the audio call resource for discharging legacy network：
The IMS network directly discharges the audio call resource that it is legacy network distribution, or
After sending a SIP signaling by legacy network, the voice for discharging it for legacy network distribution is exhaled
It is resource.
6. according to the method described in claim 1-3,5 any one, the legacy network is
Packet-switched domain PS networks, the current network are circuit commutative field CS networks.
7. the device of release resource after network switching occurs for terminal in a kind of VoLTE, including：
Ability detecting module, for terminal the speech business VoLTE based on Long Term Evolution from
Legacy network is switched to after current network, detects whether the terminal has dismounting legacy network
The ability of audio call；
Resource release module, legacy network audio call is removed if detecting the terminal and having
Ability, then in a manner of sending session initiation protocol SIP signalings, discharge the voice of legacy network
Call resources, otherwise in a manner of not sending or not retransmit SIP signalings, discharge legacy network
Audio call resource.
8. device according to claim 7, the ability detecting module passes through the original
There is network to send probe message to the terminal, if receiving the terminal by the legacy network
Reply the response message of the probe message, it is determined that the terminal, which has, removes legacy network language
The ability of sound calling.
9. device according to claim 8, the ability detecting module passes through the original
There is the response message that network does not receive probe message described in the terminal replies, then again by institute
State legacy network and send probe message to the terminal, when by the legacy network to the end
The number that end sends probe message reaches pre-determined number, and does not receive corresponding response message yet
When, determine the terminal without the ability for removing legacy network audio call.
10. according to the device described in claim 7-9 any one, the terminal is removed original
The ability of voice-over-net calling refers to the processing energy of SIP signaling of the terminal-pair from legacy network
Power.
11. device according to claim 7, the resource release module directly discharges it
The audio call resource distributed for legacy network, or pass through legacy network and send a SIP letter
After order, the audio call resource that it is legacy network distribution is discharged.
12. according to the device described in claim 7-9,11 any one, the legacy network
It is PS networks, the current network is CS networks.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610450882.0A CN107529200B (en) | 2016-06-21 | 2016-06-21 | Method and device for releasing resources after network switching of terminal in VoLTE (Voice over Long term evolution) |
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| CN201610450882.0A CN107529200B (en) | 2016-06-21 | 2016-06-21 | Method and device for releasing resources after network switching of terminal in VoLTE (Voice over Long term evolution) |
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| CN105228206A (en) * | 2014-05-27 | 2016-01-06 | 中国电信股份有限公司 | Changing method between packet-switched domain and circuit switched domain voice business and system |
| CN105049442A (en) * | 2015-08-11 | 2015-11-11 | 宇龙计算机通信科技(深圳)有限公司 | Network switching method and terminal |
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