CN109429280B - Circuit switching domain fallback method and device and user equipment - Google Patents
Circuit switching domain fallback method and device and user equipment Download PDFInfo
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- CN109429280B CN109429280B CN201710730787.0A CN201710730787A CN109429280B CN 109429280 B CN109429280 B CN 109429280B CN 201710730787 A CN201710730787 A CN 201710730787A CN 109429280 B CN109429280 B CN 109429280B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/0085—Hand-off measurements
- H04W36/0088—Scheduling hand-off measurements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0066—Transmission or use of information for re-establishing the radio link of control information between different types of networks in order to establish a new radio link in the target network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an 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
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
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Abstract
The invention provides a circuit switching domain fallback method, a circuit switching domain fallback device and user equipment. The method comprises the following steps: after executing the service carried by the first circuit switching domain, the UE receives a first signaling message, wherein the first signaling message comprises a message returned to a first preset network cell; judging whether to return to the first preset network cell or not; and if so, returning to the first preset network cell. The invention can judge whether the subsequent circuit switch domain carried service to be executed, namely the second circuit switch domain carried service, exists after the first circuit switch domain carried service is executed, and the cell appointed by LTE is returned only when the circuit switch domain carried service to be executed does not exist, thereby avoiding the abnormal communication state caused by the repeated CSFB process when the subsequent circuit switch domain carried service to be executed exists.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method, an apparatus, and a user equipment for circuit switched domain fallback.
Background
At present, LTE (Long Term Evolution ) is developed very rapidly, however, since LTE does not support services of Circuit domains such as voice call, etc., in a network where VOLTE is not deployed, a mobile terminal must perform corresponding CS (Circuit Switching) domain services through a CSFB (Circuit Switching Fall-back) manner. The basic steps of the CSFB implementation process under each large commercial network at present are as follows: a terminal initiates services of circuit domains such as voice communication and the like, and transmits a related signaling ESR (Extended Service Request, which is a special uplink air interface signaling in procedures such as CSFB (Circuit switched fallback) and the like under an LTE (Long term evolution) network to the LTE network; the LTE network issues signaling to require the terminal to fall back to a specified 2G/3G cell; the terminal determines whether to initiate a position updating process according to the position area condition of the target 2G/3G cell, if the concurrence is allowed, the terminal simultaneously initiates a routing area updating process; the terminal and the network start the CS domain service communication process; after the CS domain service is finished, the network issues signaling to require the terminal to return to the cell designated by the LTE.
In the process of implementing the invention, the inventor finds that at least the following technical problems exist in the prior art:
in the implementation process of the CSFB, if the terminal has a new CS domain service that needs to be initiated but cannot be concurrently performed with a CS domain service that is not yet completely completed (for example, a circuit domain additional service cannot be concurrently performed with another subsequent circuit domain additional service; for example, a protocol state of the network and the terminal at that time does not support concurrency, etc.), at the time when the communication process of the current CS domain service is completed, the network issues a signaling to request the terminal to return to a cell designated by LTE without knowing but with a normal communication state, so that the terminal is forced to return to LTE and cannot immediately initiate the subsequent new CS domain service, and the terminal can continue to perform the subsequent CS domain service only through the basic steps of the CSFB again until the terminal re-resides in the LTE network and completes registration; in some cases, due to the characteristics of the application program built in the terminal, there may be many continuous CS domain services that need to be performed in series, such as a circuit domain additional service, which may cause the CSFB step to be repeatedly executed many times, which may easily cause an abnormal communication state, greatly increase signaling overhead between the terminal and the network, and reduce communication efficiency.
Disclosure of Invention
The method, the device and the user equipment for circuit switching domain fallback can reduce signaling overhead between a terminal and a network and improve communication efficiency.
In a first aspect, the present invention provides a method for circuit switched domain fallback, including:
after executing a service carried by a first circuit switching domain, the UE receives a first signaling message, wherein the first signaling message comprises a message returned to a first preset network cell;
the UE judges whether to return to the first preset network cell or not; and if so, returning to the first preset network cell.
Optionally, the determining, by the UE, whether the UE may return to the first preset network cell includes:
the UE judges whether a service borne by a second circuit domain to be executed exists or not;
if yes, the mobile terminal cannot return to the first preset network cell to execute the service carried by the second circuit switching domain.
Optionally, before executing the service carried by the first circuit-switched domain, the method further includes:
sending a request for triggering a service carried by a circuit switched domain;
receiving a second signaling message, wherein the second signaling message comprises a message falling back to a second preset network cell;
correspondingly, the executing the service carried by the first circuit switching domain comprises:
and executing the service carried by the first circuit switching domain in the second preset network cell.
Optionally, after receiving the second signaling message, the method further includes:
judging whether the second preset network cell can execute the service loaded by the packet switching domain;
and if the second preset network cell can execute the service loaded by the packet switching domain, triggering a routing area updating process.
Optionally, after triggering the routing area update procedure, when receiving the first signaling message, the UE determines whether the first predetermined network cell can be returned, including:
judging whether the updating process of the routing area is finished or not;
if yes, returning to the first preset network cell; otherwise, determining that the first preset network cell cannot be returned, and continuing to wait for the completion of the route area updating process.
Optionally, after triggering the routing area update procedure and when receiving the first signaling message, the determining, by the UE, whether the UE may return to the first preset network cell includes:
judging whether the updating process of the routing area is finished and whether the UE has the service carried by the circuit switching domain which is not finished;
if the updating process of the routing area is finished and the service carried by the circuit switching domain which is not finished yet does not exist, returning to the first preset network cell; otherwise, determining that the first preset network cell cannot be returned, and continuing to wait for the completion of the updating process of the routing area, or continuing to wait for the completion of the service carried by the circuit switching domain.
Optionally, returning to the first preset network cell includes:
acquiring the time length from the receiving of the first signaling message to the current time;
judging whether the duration exceeds a preset duration or not;
and if the time length does not exceed the preset time length, determining to return to the first preset network cell.
In a second aspect, an embodiment of the present invention further provides an apparatus for circuit switched domain fallback, including:
a receiving module, configured to receive a first signaling message after executing a service carried in a first circuit switched domain, where the first signaling message includes a message returned to a first preset network cell;
the judging module is used for judging whether the first preset network cell can be returned or not;
and the returning module is used for returning to the first preset network cell when judging that the first preset network cell can be returned.
Optionally, the determining module is specifically configured to: judging whether the service carried by the second circuit domain to be executed exists or not; and when the service carried by the second circuit switched domain to be executed exists, the service cannot be returned to the first preset network cell to execute the service carried by the second circuit switched domain.
Optionally, the apparatus further comprises:
a sending module, which sends a request for triggering the service carried by the circuit switching domain;
the receiving module is further configured to receive a second signaling message, where the second signaling message includes a message that falls back to a second preset network cell;
correspondingly, the device further comprises:
and the execution module is used for executing the service carried by the first circuit switching domain in the second preset network cell.
Optionally, the determining module is further configured to determine whether the service carried in the packet switched domain can be executed in the second preset network cell;
the sending module is further configured to trigger a routing area update process when the second preset network cell is capable of executing a service carried by a packet switched domain.
Optionally, the determining module is further configured to determine whether the routing area update process is completed;
the returning module is further configured to return to the first preset network cell when the routing area update message is completed, otherwise, determine that the first preset network cell cannot be returned, and continue to wait for the completion of the routing area update process.
Optionally, the determining module is further configured to determine whether the routing area update process is completed and whether the UE has a service that is carried by a circuit switched domain and is not yet executed;
the return module is further configured to return to the first preset network cell after the routing area update message is completed and the execution of the services carried by all circuit switched domains is completed; otherwise, determining that the first preset network cell cannot be returned, and continuing to wait for the completion of the updating process of the routing area, or continuing to wait for the completion of the service carried by the circuit switching domain.
Optionally, the return module specifically includes:
the time length obtaining unit is used for obtaining the time length from the time when the first signaling message is received to the current time;
the time length judging unit is used for judging whether the time length exceeds a preset time length or not;
and the determining unit is used for determining to return to the first preset network cell when the time length does not exceed the preset time length.
In a third aspect, an embodiment of the present invention further provides a user equipment, where the user equipment includes the apparatus for circuit switched domain fallback.
The method, the device and the user equipment for circuit switching domain fallback provided by the embodiment of the invention judge whether the subsequent service carried by the circuit switching domain to be executed, namely the service carried by the second circuit domain, exists after the service carried by the first circuit switching domain is executed, and return to the cell designated by LTE, namely the first preset network cell, only when the service carried by the circuit switching domain to be executed does not exist, so that the problem that the communication state is abnormal due to a repeated CSFB process when the subsequent service carried by the circuit switching domain to be executed exists is avoided.
Drawings
Fig. 1 is a flowchart of a circuit switched domain fallback method according to an embodiment of the present invention;
fig. 2 is a flowchart of a circuit switched domain fallback method according to another embodiment of the present invention;
fig. 3 is a flowchart of a circuit switched domain fallback method according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of a circuit switched domain fallback apparatus according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a circuit switched domain fallback apparatus according to another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Before describing the embodiments of the present invention, a mobile communication service will be described first.
For different network bearer mechanisms, the services of mobile communication can be divided into: services carried by the circuit switched CS domain, such as voice telephony, short message and supplementary services, etc.; the services carried in a Packet Switching (PS) domain include data services and session services, and the session services may also be Voice over Internet Protocol (VoIP) services carried in the Internet Protocol. Voice traffic may be carried in the CS domain or in the PS domain.
For convenience of description, the service carried by the circuit switching domain in the following embodiments may be understood as the service carried by the CS domain; the service carried by the packet switching domain can be understood as the service carried by the PS domain; the first preset network cell can be understood as an LTE cell designated by the network; the second pre-set network cell may be understood as a 2G/3G cell, which is used for illustration only and does not limit the meaning of specific terms.
An embodiment of the present invention provides a method for circuit switched domain fallback, as shown in fig. 1, where the method includes:
s11, after executing the service carried by the first circuit-switched domain, the UE receives a first signaling message, where the first signaling message includes a message returned to the first predetermined network cell.
In this embodiment, the service carried by the first circuit switched domain may be understood as a service carried by the first CS domain, which is executed by a terminal, such as a mobile phone, a tablet computer capable of communicating, and the like.
The receiving of the first signaling message may be understood as receiving the first signaling message issued by the network side, and generally, the communication process of the service carried by the CS domain is started between the terminal and the network side, and after the service is finished, the network side may issue a signaling under a normal condition to request the terminal to return to the LTE cell specified by the network.
S12, the UE judges whether to return to the first preset network cell.
It can be understood that when the service carried by the circuit domain is the service carried by the last circuit domain, there is an end identifier. If the service carried by the first circuit switching domain has no ending mark, the service carried by the second circuit switching domain to be executed is described.
And S13, if yes, returning to the first preset network cell.
The embodiment of the invention provides a circuit switching domain fallback method, after a service carried by a first circuit switching domain is executed, whether a subsequent service carried by the circuit switching domain to be executed, namely a service carried by a second circuit domain, exists is judged according to the service carried by the first circuit domain, and a cell designated by LTE is returned only when no service carried by the circuit switching domain to be executed exists, so that the problem that a communication state is abnormal due to a repeated CSFB process when the subsequent service carried by the circuit switching domain to be executed exists is avoided.
Optionally, an embodiment of the present invention further provides a circuit switched domain fallback method, as shown in fig. 2, where the method includes the following steps:
s21, sending a request for triggering the service carried by the circuit switched domain.
Generally, when a mobile terminal is camped on an LTE network and initiates a request for a service carried by a CS domain of a calling or called party, a signaling is initiated to the LTE network to trigger CSFB, where the signaling may be ESR signaling.
S22, receiving a second signaling message, wherein the second signaling message comprises a message falling back to a second preset network cell.
When the network side receives the ESR signaling, the network side sends the signaling to require the terminal to fall back to the designated 2G/3G cell.
And S23, executing the service carried by the first circuit switching domain in the second preset network cell.
S24, after executing the service carried by the first circuit switched domain, receiving a first signaling message, where the first signaling message includes a message returning to the first predetermined network cell.
In the above steps S23-S24, when the terminal receives the signaling of falling back to the 2G/3G cell, it will start the communication process of the service carried by the CS domain with the network side; after the service is finished, the network side will send signaling to request the terminal to return to the designated LTE cell under normal condition.
S25, judging whether the UE can return to the first preset network cell, if yes, executing step S26, otherwise, executing step S27.
Optionally, the step S25 includes the following steps:
s251, the UE judges whether a service borne by the second circuit domain to be executed exists or not;
s252, if there is a service carried by the second circuit switched domain to be executed in the service carried by the first circuit switched domain, executing step S27.
And S26, returning to the first preset network cell.
S27, disregarding the signaling of the network side, but recording the LTE cell information specified by the network side, continuing to complete all subsequent CS services in the current 3G or 2G network until no new CS service needs to be initiated, and continuing to execute step S26.
Optionally, the step S26 includes the following steps:
s261, acquiring the time length from the time when the first signaling message is received to the current time.
It can be understood that, when the first signaling message is received in step S24, it is necessary to record the LTE cell specified by the network side and record the time of receiving the first signaling message at that time.
S262, judging whether the duration exceeds a preset duration or not;
the preset time duration in this embodiment may be understood as a one-time clock, for example, 20 seconds, 30 seconds, and the like, and the specific preset time duration is not limited in this embodiment.
And S263, if the time length does not exceed the preset time length, determining to return to the first preset network cell.
In the step S26, the problem that the cell returning to the first predetermined network cell is invalid due to the long time from the first signaling message to the current time is avoided through the steps S261 to S263.
In the CSFB process, after a terminal falls back to a specified 2G/3G cell and completes a CS service, if a subsequent CS service needs to be initiated to a network, the terminal is not required to send a command of the specified LTE cell back to the network, but information of the LTE cell is recorded for a judgment basis when the LTE cell is subsequently and autonomously returned, until the subsequent CS service is completely completed, the terminal determines whether to return to the LTE network according to the previously recorded information of the LTE cell specified by the network, and the whole CSFB process is finished. Compared with the prior art, the invention can effectively avoid the communication state abnormity easily caused by frequent and repeated CSFB process under the actual network condition, reduce the communication resource consumption caused by frequent signaling, and can improve the service experience of users.
In addition, when the terminal returns to the first preset network cell, the terminal returns to the first preset network cell by judging the time length from the time when the first signaling message is received to the current time and returning to the first preset network cell when the time length does not exceed the preset time length, so that the problem that the first preset network cell fails due to the fact that the time length from the time when the first signaling message is received to the current time is too long is solved, and the terminal can return autonomously by the method of the embodiment under the condition that the first preset network cell is enabled to be effective; and if the time length from the time when the first signaling message is received to the current time exceeds the preset time length, the first preset network cell is considered to be invalid, and the first preset network cell cannot be returned to for residing immediately.
When the terminal switches or resides in the 2G/3G cell in the process of the basic steps of the CSFB implementation process, the terminal determines whether to initiate the location updating process according to the location area condition of the designated 2G/3G cell, if the concurrence is allowed, the terminal simultaneously initiates the routing area updating process. When the updating process of the routing area is not completed, the network side of the CS domain issues signaling to require the terminal to return to the designated LTE cell under the condition that the PS domain condition is unknown but the communication state is normal, so that the terminal is forced to return to the LTE according to the protocol specification, and the updating process of the routing area is abnormally failed; in this case, communication abnormality is also easily caused in an actual network, for example, a terminal fails to respond to a subsequent LTE registration process.
Optionally, an embodiment of the present invention further provides a method for circuit-switched domain fallback, as shown in fig. 3, when a terminal cares about a condition of a PS domain, after the method receives a second signaling message in step S22 in fig. 2, the method further includes:
s28, judging whether the second preset network cell can execute the service carried by the packet switching domain; if the second predetermined network cell is capable of executing the service carried by the packet switched domain, performing step S29; if not, go to step S23;
s29, executing the service carried by the first circuit switching domain in the second preset network cell; meanwhile, executing a routing area updating process;
s30, after executing the service carried by the first circuit switching domain, receiving a first signaling message;
s31, judging whether the routing area updating message is finished or not, if so, executing a step S26 to return to the first preset network cell; otherwise, step S32 is executed.
S32, the terminal disregards the signaling sent by the network, but records the LTE cell information specified by the network, and continues to complete the routing area update procedure in the current 3G or 2G network, and continues to execute step S26.
In the above steps, a general signaling is issued on the network side to request the terminal to fall back to the designated 2G/3G cell; the terminal determines whether to initiate the location updating process according to the situation of the location area to which the designated 2G/3G cell belongs, if the concurrence is allowed, the terminal can simultaneously initiate the routing area updating process.
If there is a routing area update, before returning to the first default network cell in step S26, it is determined whether the routing area update is completed, and only after the routing area update is completed, step S26 is performed to return to the first default network cell.
In the CSFB process, after a terminal falls back to a specified 2G/3G cell and completes a CS service, if a routing area updating process in progress is judged, the command of the network side for requiring the terminal to return to the specified LTE cell is disregarded, and information of the LTE cell is recorded for a judgment basis when the LTE cell is subsequently and autonomously returned; and when the subsequent CS services are completely finished and the ongoing route area updating process does not exist, the terminal determines whether to return to the LTE network or not according to the recorded LTE cell information appointed by the network, and the whole CSFB process is finished. The problem that the terminal is forced to return to the LTE according to the protocol specification so that the updating process of the routing area is abnormally failed can be effectively avoided when the network side of the CS domain issues signaling to require the terminal to return to the appointed LTE cell under the condition that the PS domain condition is unknown but the communication state is normal, and the service experience of a user is improved.
Optionally, an embodiment of the present invention provides an apparatus for circuit-switched domain fallback, where as shown in fig. 4, the apparatus includes:
a receiving module 41, configured to receive a first signaling message after executing a service carried by a first circuit switched domain, where the first signaling message includes a message returned to a first preset network cell;
a determining module 42, configured to determine whether the first predetermined network cell can be returned;
the returning module 43 returns to the first predetermined network cell when it is determined that the first predetermined network cell can be returned.
The embodiment of the invention provides a circuit switching domain fallback device, after a service carried by a first circuit switching domain is executed, whether a subsequent service carried by the circuit switching domain to be executed, namely a service carried by a second circuit domain, exists is judged according to the service carried by the first circuit domain, and a cell designated by LTE is returned only when no service carried by the circuit switching domain to be executed exists, so that the problem that a communication state is abnormal due to a repeated CSFB process when the subsequent service carried by the circuit switching domain to be executed exists is avoided.
Optionally, an embodiment of the present invention provides an apparatus for circuit switched domain fallback, where as shown in fig. 5, the apparatus includes:
a sending module 51, configured to send a request for triggering a service carried by a circuit switched domain;
a receiving module 52, configured to receive a second signaling message, where the second signaling message includes a message that falls back to a second preset network cell;
an executing module 53, configured to execute, in the second preset network cell, the service carried in the first circuit-switched domain.
A receiving module 52, configured to receive a first signaling message after executing a service carried by a first circuit switched domain, where the first signaling message includes a message returned to a first preset network cell;
a judging module 54, configured to judge whether to return to a first preset network cell according to the service carried by the first circuit switched domain;
specifically, the determining module is specifically configured to: judging whether the service carried by the first circuit switching domain comprises an end identifier or not;
and when the service carried by the first circuit switching domain has no ending mark, determining the service carried by the second circuit switching domain to be executed.
A returning module 55, configured to return to the first predetermined network cell when there is no service carried by the second circuit-switched domain to be executed.
Further, the return module 55 also includes not shown in fig. 5:
the return module specifically includes:
a duration obtaining unit 551, configured to obtain a duration from receiving the first signaling message to the current time;
a duration judging unit 552, configured to judge whether the duration exceeds a preset duration;
a determining unit 553, configured to determine to return to the first preset network cell when the duration does not exceed a preset duration.
In the CSFB process, after the terminal falls back to the designated 2G/3G cell and completes the CS service, it is determined that if there is a subsequent CS service that needs to be initiated to the network, it is not necessary to accept a command that the terminal of the network requests the terminal to return to the designated LTE cell, but the information of the LTE cell is recorded as a basis for determination when the subsequent LTE cell is autonomously returned, until the subsequent CS service is completely completed, the terminal determines whether to return to the LTE network according to the previously recorded LTE cell information designated by the network, and the entire CSFB process is completed. Compared with the prior art, the invention can effectively avoid the communication state abnormity easily caused by frequent and repeated CSFB process under the actual network condition, reduce the communication resource consumption caused by frequent signaling, and can improve the service experience of users.
In addition, when the terminal returns to the first preset network cell, the terminal returns to the first preset network cell by judging the time length from the time when the first signaling message is received to the current time and returning to the first preset network cell when the time length does not exceed the preset time length, so that the problem that the first preset network cell fails due to the fact that the time length from the time when the first signaling message is received to the current time is too long is solved, and the terminal can return autonomously by the device of the embodiment under the condition that the first preset network cell is enabled to be effective; and if the time length from the time when the first signaling message is received to the current time exceeds the preset time length, the first preset network cell is considered to be invalid, and the first preset network cell cannot be returned to for residing immediately.
When the terminal switches or resides in the 2G/3G cell in the process of the basic steps of the CSFB implementation process, the terminal determines whether to initiate a location updating process according to the situation of the location area to which the specified 2G/3G cell belongs. When the updating process of the routing area is not completed, the network side of the CS domain issues signaling to require the terminal to return to the designated LTE cell under the condition that the PS domain condition is unknown but the communication state is normal, so that the terminal is forced to return to the LTE according to the protocol specification, and the updating process of the routing area is abnormally failed; in this case, communication abnormality is also easily caused in an actual network, for example, a terminal fails to respond to a subsequent LTE registration process.
Therefore, an embodiment of the present invention further provides a circuit switched domain fallback apparatus, where:
the judging module is further configured to judge whether the service carried in the packet switched domain can be executed in the second preset network cell;
the sending module is further configured to initiate a routing area update process when the second preset network cell is capable of executing a service carried by a packet switched domain.
The judging module is further configured to judge whether the routing area updating process is completed;
the returning module is further configured to return to the first preset network cell when the routing area updating process is completed.
In the CSFB process, after the terminal falls back to the designated 2G/3G cell and completes the CS service, it is determined that if there is still an ongoing routing area update process, the command requesting the terminal to return to the designated LTE cell on the network side is disregarded, but information of the LTE cell is recorded for a basis for determination when the LTE cell is subsequently autonomously returned; and when the subsequent CS services are completely finished and no ongoing routing area updating process exists, the terminal determines whether to return to the LTE network or not according to the recorded LTE cell information appointed by the network, and the whole CSFB process is finished. The problem that the terminal is forced to return to the LTE according to the protocol specification so that the updating process of the routing area is abnormally failed can be effectively avoided when the network side of the CS domain issues signaling to require the terminal to return to the appointed LTE cell under the condition that the PS domain condition is unknown but the communication state is normal, and the service experience of a user is improved.
It should be noted that the apparatus for circuit switched domain fallback and the method for circuit switched domain fallback are in a one-to-one correspondence relationship, details in the embodiment of the method are also applicable to the apparatus, and details of the specific implementation of the apparatus are not described in detail in this embodiment.
The embodiment of the invention also provides user equipment which comprises the circuit switching domain fallback device.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above may be implemented by a computer program, which may be stored in a computer readable storage medium and executed by a computer to implement the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (5)
1. A method of circuit switched domain fallback, comprising:
sending a request for triggering the service carried by the circuit switched domain before executing the service carried by the first circuit switched domain;
receiving a second signaling message, wherein the second signaling message comprises a message falling back to a second preset network cell;
judging whether the second preset network cell can execute the service loaded by the packet switching domain;
if the second preset network cell can execute the service loaded by the packet switching domain, triggering a routing area updating process;
executing the service carried by the first circuit switching domain in the second preset network cell;
after executing a service carried by a first circuit switching domain, the UE receives a first signaling message, wherein the first signaling message comprises a message returned to a first preset network cell;
judging whether the updating process of the routing area is finished and whether the UE has the service carried by the circuit switching domain which is not finished;
if the updating process of the routing area is finished and no service carried by the circuit switching domain which is not finished is available, returning to the first preset network cell; otherwise, determining that the first preset network cell cannot be returned, and continuing to wait for the completion of the updating process of the routing area, or continuing to wait for the completion of the service carried by the circuit switching domain.
2. The method of claim 1, wherein returning to the first pre-determined network cell comprises:
acquiring the time length from the time when the first signaling message is received to the current time;
judging whether the duration exceeds a preset duration or not;
and if the time length does not exceed the preset time length, determining to return to the first preset network cell.
3. An apparatus of circuit switched domain fallback, comprising:
a receiving module, configured to receive a first signaling message after executing a service carried in a first circuit switched domain, where the first signaling message includes a message returned to a first preset network cell; the first signaling message is also used for receiving a second signaling message, wherein the second signaling message comprises a message falling back to a second preset network cell;
the judging module is used for judging whether the updating process of the routing area is finished and whether the UE has the service carried by the circuit switching domain which is not finished; the first circuit switching domain is used for executing the service loaded in the first circuit switching domain, and the second circuit switching domain is used for executing the service loaded in the second circuit switching domain;
a sending module, configured to send a request for triggering a service carried by a circuit switched domain; the second preset network cell is also used for triggering a routing area updating process when the second preset network cell can execute the service loaded by the packet switching domain;
the execution module is used for executing the service loaded by the first circuit switching domain in the second preset network cell;
a returning module, configured to return to the first preset network cell after the routing area update message is completed and the execution of the services carried by all circuit switched domains is completed; otherwise, determining that the first preset network cell cannot be returned, and continuing to wait for the completion of the updating process of the routing area, or continuing to wait for the completion of the service carried by the circuit switching domain.
4. The apparatus according to claim 3, wherein the return module specifically includes:
the time length obtaining unit is used for obtaining the time length from the time when the first signaling message is received to the current time;
the time length judging unit is used for judging whether the time length exceeds a preset time length or not;
and the determining unit is used for determining to return to the first preset network cell when the time length does not exceed the preset time length.
5. A user equipment, characterized in that the user equipment comprises the circuit switched domain fallback apparatus according to any one of claims 3 to 4.
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