CN106162623B - CSFB terminal voice call encryption method, device and terminal - Google Patents
CSFB terminal voice call encryption method, device and terminal Download PDFInfo
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- CN106162623B CN106162623B CN201510172757.3A CN201510172757A CN106162623B CN 106162623 B CN106162623 B CN 106162623B CN 201510172757 A CN201510172757 A CN 201510172757A CN 106162623 B CN106162623 B CN 106162623B
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Abstract
The invention provides a CSFB terminal voice call encryption method, a CSFB terminal voice call encryption device and a CSFB terminal voice call encryption terminal, wherein the CSFB terminal voice call encryption method is applied to a calling terminal, the calling terminal is suitable for an LTE network with access to 2G and 3G wireless frequency points, and the method comprises the following steps: starting a flow of initiating a voice encryption call to a called terminal; receiving a redirection message issued by an LTE network, and setting the priority of a 3G frequency point to be higher than the priority of a 2G frequency point in the redirection message; and returning to the 3G cell according to the redirection message, and carrying out voice encryption communication. The invention solves the problems of long delay, low reliability and network reconstruction when the calling terminal and the called terminal carry out voice encryption communication.
Description
Technical Field
The invention relates to the field of mobile communication, in particular to a CSFB terminal voice call encryption method, a CSFB terminal voice call encryption device and a CSFB terminal voice call encryption terminal.
Background
At present, because of network transmission, a GSM network cannot directly carry encrypted voice and can only carry out encrypted voice transmission through a 3G network, so that for a 4G terminal, when the terminal carries out end-to-end encrypted voice communication, the terminal can automatically carry out end-to-end encrypted communication on the 3G network no matter how the network is configured. For the requirement, the prior art scheme is as follows:
the 3G mode conversion is performed by using OTT (Over The Top) Service, short message Service, or USSD (unstructured supplementary Service Data).
CSFB (Circuit Switched Fallback) is a mainstream 4G mobile phone solution at present, and due to the network policy of an operator, during a voice Fallback process, a terminal may load voice on a GSM network, and in this case, the terminal cannot load encrypted voice.
Fig. 1 is a schematic diagram illustrating state synchronization between a calling terminal and a called terminal when encrypted communication is performed.
Although the prior technical scheme solves the problem that a calling terminal and a called terminal can be in a 3G network when a 4G terminal carries out encrypted communication, the prior technical scheme has the following problems:
1. the network needs to be modified. By adopting the USSD or OTT scheme, a new USSD or OTT server needs to be added, or the existing USSD server or OTT server needs to be modified, and network modification is not needed through the short message scheme.
2. The encrypted call setup delay is large. Before the terminal carries out the encrypted call process, short message notification, short message confirmation and mode conversion are required to be carried out once. In this case, the delay time is 10 seconds or more longer than the normal CSFB call time.
3. The reliability is low. When the short message/USSD/OTT is transmitting, because the short message/USSD/OTT is transmitted through a common channel or forwarded through a common service platform, when the service is busy, the short message/USSD/OTT message may not be transmitted in time, thereby causing encrypted call failure.
Disclosure of Invention
The invention provides a CSFB terminal voice call encryption method, a CSFB terminal voice call encryption device and a CSFB terminal, and aims to solve the problems that a calling terminal and a called terminal are long in delay and low in reliability when voice encryption calls are carried out, and a network needs to be modified.
In order to solve the technical problem, the invention provides a method for encrypting a voice call of a CSFB (Circuit switched fallback) terminal, which is applied to a calling terminal, wherein the calling terminal is suitable for an LTE (Long term evolution) network with access to 2G and 3G wireless frequency points, and the method comprises the following steps:
starting a flow of initiating a voice encryption call to a called terminal;
receiving a redirection message issued by an LTE network, and setting the priority of a 3G frequency point to be higher than the priority of a 2G frequency point in the redirection message;
and returning to the 3G cell according to the redirection message, and carrying out voice encryption communication.
Optionally, in the step of setting the priority of the 3G frequency point to be higher than the priority of the 2G frequency point in the redirection message, the method further includes: and filling 3G frequency points which can fall back into the redirection message.
Optionally, the filling of the fallback 3G frequency points in the redirection message at the same time specifically includes: filling the 3G frequency points in the system message into 3G frequency points which can fall back; and/or presetting known 3G frequency points, and filling the known 3G frequency points into 3G frequency points which can fall back.
Optionally, the step of filling a fallback 3G frequency point in the redirection message at the same time specifically includes: and filling 3G frequency points which can be fallen back in an Freq Priority List UTRA-FDD field and an Freq Priority List UTRA-TDD field in the redirection message.
Optionally, the dropping to the 3G cell according to the redirection message performs voice encryption call, which specifically includes: searching a fallback cell according to the redirection message, if an effective 3G frequency point is searched, fallback to the searched 3G cell, and carrying out voice encryption conversation; and if the effective 3G frequency point cannot be searched, the voice encryption conversation fails.
According to another aspect of the present invention, there is also provided a method for encrypting a CSFB terminal voice call, which is applied to a called terminal, where the called terminal is adapted to access an LTE network with 2G and 3G wireless frequency points, and the method includes:
receiving a page of a calling terminal on the LTE network;
receiving a redirection message issued by an LTE network, and setting the priority of a 3G frequency point to be higher than the priority of a 2G frequency point in the redirection message;
and returning to the 3G cell according to the redirection message, and carrying out voice encryption communication.
Optionally, in the step of setting the priority of the 3G frequency point to be higher than the priority of the 2G frequency point in the redirection message, the method further includes: and filling 3G frequency points which can fall back into the redirection message.
Optionally, the filling of the fallback 3G frequency points in the redirection message at the same time specifically includes: filling the 3G frequency points in the system message into 3G frequency points which can fall back; and/or presetting known 3G frequency points, and filling the known 3G frequency points into 3G frequency points which can fall back.
Optionally, the step of filling a fallback 3G frequency point in the redirection message at the same time specifically includes: and filling 3G frequency points which can be fallen back in an Freq Priority List UTRA-FDD field and an Freq Priority List UTRA-TDD field in the redirection message.
Optionally, the dropping to the 3G cell according to the redirection message performs voice encryption call, which specifically includes: searching a fallback cell according to the redirection message, if an effective 3G frequency point is searched, fallback to the searched 3G cell, and carrying out voice encryption conversation; and if the effective 3G frequency point cannot be searched, searching the 2G frequency point and falling back to the searched 2G cell.
According to another aspect of the present invention, there is also provided a CSFB terminal voice call encryption apparatus, applied to a calling terminal of an LTE network accessing 2G and 3G wireless frequency points, the apparatus including: the starting module is used for starting a flow of initiating a voice encryption call to a called terminal; the first processing module is used for receiving a redirection message issued by an LTE network, and setting the priority of a 3G frequency point to be higher than the priority of a 2G frequency point in the redirection message; and the second processing module is used for falling back to the 3G cell according to the redirection message to carry out voice encryption communication.
Optionally, the first processing module is further configured to fill a fallback 3G frequency point in the redirection message.
Optionally, the first processing module is further configured to fill a 3G frequency point in a system message as a fallback-able 3G frequency point; and/or presetting known 3G frequency points, and filling the known 3G frequency points into 3G frequency points which can fall back.
Optionally, the first processing module is further configured to fill a 3G frequency point that can fall back in a Freq Priority List UTRA-FDD field and a Freq Priority List UTRA-TDD field in the redirection message.
Optionally, the second processing module is further configured to search a fallback cell according to the redirection message, and if a valid 3G frequency point is searched, fallback to the searched 3G cell to perform voice encrypted call; and if the effective 3G frequency point cannot be searched, the voice encryption conversation fails.
According to another aspect of the present invention, there is also provided a calling terminal, where the calling terminal includes the above-mentioned apparatus for voice call encryption of a CSFB terminal applied to the calling terminal.
According to another aspect of the present invention, there is also provided a CSFB terminal voice call encryption apparatus, applied to a called terminal of an LTE network accessing 2G and 3G wireless frequency points, the apparatus including: a receiving module, configured to receive a page of a calling terminal on the LTE network; the third processing module is used for receiving a redirection message issued by an LTE network, and setting the priority of the 3G frequency point to be higher than the priority of the 2G frequency point in the redirection message; and the fourth processing module is used for falling back to the 3G cell according to the redirection message to carry out voice encryption communication.
Optionally, the third processing module is further configured to fill a 3G frequency point that can fall back in the redirection message.
Optionally, the third processing module is further configured to fill the 3G frequency point in the system message as a fallback 3G frequency point; and/or presetting known 3G frequency points, and filling the known 3G frequency points into 3G frequency points which can fall back.
Optionally, the third processing module is further configured to fill a 3G frequency point that can fall back in a Freq Priority List UTRA-FDD field and a Freq Priority List UTRA-TDD field in the redirection message.
Optionally, the fourth processing module is further configured to search a fallback cell according to the redirection message, and if a valid 3G frequency point is searched, fallback to the searched 3G cell to perform voice encrypted call; and if the effective 3G frequency point cannot be searched, searching the 2G frequency point and falling back to the searched 2G cell.
According to another aspect of the present invention, there is also provided a called terminal including a CSFB terminal voice call encryption apparatus applied to the called terminal.
The invention has the beneficial effects that:
after the flow of initiating the voice encryption call to the called terminal is started, the invention receives the redirection message issued by the LTE network, and sets the priority of the 3G frequency point to be higher than the priority of the 2G frequency point in the redirection message, so that the calling terminal falls back to the 3G cell according to the redirection message to carry out the voice encryption call. In the invention, because the priority of the 3G frequency point is set to be higher than the priority of the 2G frequency point in the redirection message, when the calling terminal searches the fallen cell according to the redirection message, the calling terminal can preferentially and automatically search the 3G cell and fall back to the searched 3G cell to carry out voice encryption communication. The invention solves the problems of long delay and low reliability when the calling terminal and the called terminal carry out voice encryption communication without changing the network.
Drawings
Fig. 1 is a schematic diagram illustrating state synchronization of a calling terminal and a called terminal in encrypted communication;
fig. 2 is a flowchart illustrating the main steps of a method for encrypting a voice call of a CSFB terminal applied to a calling terminal according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating the detailed steps of the method for encrypting the voice call of the CSFB terminal applied to the calling terminal in the embodiment of the present invention;
fig. 4 is a flowchart illustrating the main steps of a method for voice call encryption of a CSFB terminal applied to a called terminal in an embodiment of the present invention;
fig. 5 is a flowchart illustrating the detailed steps of the method for voice call encryption of the CSFB terminal applied to the called terminal in the embodiment of the present invention;
fig. 6 is a block diagram illustrating an apparatus for voice call encryption of a CSFB terminal applied to a calling terminal in an embodiment of the present invention; and
fig. 7 is a block diagram illustrating an apparatus for voice call encryption of a CSFB terminal applied to a called terminal according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The invention can lead the calling terminal and the called terminal to independently search the 3G frequency point by preprocessing the reorientation message, thereby solving the problems of longer delay and lower reliability when the calling terminal initiates the voice encryption conversation. However, it should be noted that the present invention is applicable to the case where the CSFB network adopts the R8 scheme, and the network only specifies 2/3G radio access frequency points, and the 2/3G network shares the core network.
As shown in fig. 2, which is a flowchart of main steps of a method for encrypting a voice call of a CSFB terminal applied to a calling terminal in an embodiment of the present invention, the method mainly includes the following steps:
step S101, starting a process of initiating a voice encryption call to a called terminal.
In this step, the calling terminal confirms that the initiated voice call is a voice encryption call, and then starts a flow of initiating the voice encryption call to the called terminal.
Step S102, receiving a redirection message issued by the LTE network, and setting the priority of the 3G frequency point to be higher than the priority of the 2G frequency point in the redirection message.
In this step, the calling terminal receives a redirection message issued by the LTE network, and sets the priority of the 3G frequency point to be higher than the priority of the 2G frequency point in the redirection message. Specifically, before setting the priority order, the 3G frequency points that the calling terminal can fall back to may be filled in the redirection message.
And step S103, falling back to the 3G cell according to the redirection message, and carrying out voice encryption communication.
In this step, the calling terminal falls back to the 3G cell according to the redirection message, and carries out voice encryption communication. The calling terminal searches the fallback cell according to the redirection message, and because the priority of the 3G frequency point is set to be higher than the priority of the 2G frequency point in the redirection message, the calling terminal automatically searches an effective 3G frequency point at first, and when the calling terminal searches the effective 3G frequency point, the calling terminal falls back to the searched 3G cell to perform voice encryption conversation.
As shown in fig. 3, a detailed flowchart of the steps of the method for encrypting the voice call of the CSFB terminal applied to the calling terminal in the embodiment of the present invention includes the following steps:
step S101, starting a process of initiating a voice encryption call to a called terminal.
In this step, the calling terminal confirms that the initiated voice call is a voice encryption call, and then starts a flow of initiating the voice encryption call to the called terminal. Specifically, if the call is not a voice encrypted call initiated by the calling terminal, the calling terminal only needs to fall back according to the configuration of the existing LTE network.
Step S1021, receiving a redirection message issued by the LTE network.
Step S1022, the fallback 3G frequency point is filled in the redirection message.
In this step, the calling terminal may fill the 3G frequency point in the system message into the redirection message as a fallback 3G frequency point, specifically, the system message is a system message of an LTE network. In addition, the calling terminal may also preset a known 3G frequency point, for example, all the known 3G frequency points such as the china mobile TDS network distribution frequency point, and then fill the preset known 3G frequency point into the redirection message as a fallback-able 3G frequency point. In addition, the calling terminal can also jointly fill the 3G frequency point and the known 3G frequency point in the system message into the redirection message as the fallback-able 3G frequency point. Specifically, the calling terminal may fill a fallback 3G frequency point in the Freq Priority List UTRA-FDD field and the Freq Priority List UTRA-TDD field in the redirection message.
And step S1023, setting the priority of the 3G frequency point to be higher than that of the 2G frequency point.
In this step, in order to enable the calling terminal to independently search the 3G frequency point, the calling terminal sets the priority of the 3G frequency point to be higher than the priority of the 2G frequency point in the redirection message.
Step S1031, searching a fallback cell according to the redirection message, if an effective 3G frequency point is searched, fallback to the searched 3G cell, and performing voice encryption communication; and if the effective 3G frequency point cannot be searched, the voice encryption conversation fails.
In this step, the calling terminal searches the fallback cell according to the processed redirection message, that is, searches the fallback cell according to the redirection message which fills the 3G frequency point and sets the priority of the 3G frequency point to be higher than the priority of the 2G frequency point. If the calling terminal searches the effective 3G frequency point, the calling terminal falls back to the searched 3G cell to carry out voice encryption conversation; and if the calling terminal does not search the effective 3G frequency point, the voice encryption conversation fails.
The invention autonomously searches the 3G frequency point according to the redirection message which is filled with the 3G frequency point and is set with the priority, shortens the time of the calling terminal when the calling terminal initiates the voice encryption communication, and improves the reliability of the voice encryption communication.
As shown in fig. 4, which is a flowchart of main steps of a method for encrypting a voice call of a CSFB terminal applied to a called terminal in an embodiment of the present invention, the method includes the following steps:
step S201, receiving a page of the calling terminal on the LTE network.
In this step, the called terminal receives the page of the calling terminal on the LTE network.
Step S202, receiving a redirection message issued by the LTE network, and setting the priority of the 3G frequency point to be higher than the priority of the 2G frequency point in the redirection message.
In this step, specifically, the called terminal first initiates an extended-service-Request message to the LTE network, then receives a redirection message issued by the LTE network, and sets the priority of the 3G frequency point to be higher than the priority of the 2G frequency point in the redirection message. Specifically, before setting the order of priority, the 3G frequency points that the called terminal can fall back to may be filled in the redirection message.
And step S203, falling back to the 3G cell according to the redirection message, and carrying out voice encryption communication.
In this step, the called terminal falls back to the 3G cell according to the redirection message, and carries out voice encryption communication. The called terminal searches the fallback cell according to the redirection message, and because the priority of the 3G frequency point is set to be higher than the priority of the 2G frequency point in the redirection message, the called terminal automatically searches an effective 3G frequency point at first, and when the called terminal searches the effective 3G frequency point, the called terminal falls back to the searched 3G cell to perform voice encryption conversation.
As shown in fig. 5, which is a detailed step flowchart of the method for encrypting the voice call of the CSFB terminal applied to the called terminal in the embodiment of the present invention, the method mainly includes the following steps:
step S201, receiving a page of the calling terminal on the LTE network.
In this step, the called terminal receives the page of the calling terminal on the LTE network.
Step S2021, receives a redirection message sent by the LTE network.
In this step, specifically, the called terminal first initiates an extended-service-Request message to the LTE network, and then receives a redirection message issued by the LTE network.
Step S2022, filling the fallback 3G frequency point in the redirection message.
In this step, the called terminal may fill the 3G frequency point in the system message into the redirection message, as a fallback-able 3G frequency point, specifically, the system message is a system message of an LTE network. In addition, the called terminal may also preset a known 3G frequency point, for example, all the known 3G frequency points such as the china mobile TDS network distribution frequency point, and then fill the preset known 3G frequency point into the redirection message as a fallback 3G frequency point. In addition, the called terminal can also jointly fill the 3G frequency point and the known 3G frequency point in the system message into the redirection message as the fallback 3G frequency point. Specifically, the called terminal may fill the 3G frequency points in the Freq Priority List UTRA-FDD field and the Freq Priority List UTRA-TDD field in the redirection message.
Step S2023, the priority of the 3G frequency point is set to be higher than that of the 2G frequency point.
In this step, in order to enable the called terminal to independently search for the 3G frequency point, the called terminal sets the priority of the 3G frequency point to be higher than the priority of the 2G frequency point in the redirection message.
Step S2031, searching a fallback cell according to the redirection message, if an effective 3G frequency point is searched, fallback to the searched 3G cell, and performing voice encryption communication; and if the effective 3G frequency point cannot be searched, searching the 2G frequency point and falling back to the searched 2G cell.
In this step, the called terminal searches the fallback cell according to the processed redirection message, that is, searches the fallback cell according to the redirection message which fills the 3G frequency point and sets the priority of the 3G frequency point to be higher than the priority of the 2G frequency point. If the called terminal searches the effective 3G frequency point, the called terminal falls back to the searched 3G cell to carry out voice encryption communication; and if the called terminal does not search the effective 3G frequency point, the called terminal performs fallback according to the existing LTE network configuration, namely, searches the 2G frequency point and falls back to the searched 2G cell.
As shown in fig. 6, which is a block diagram of an apparatus for encrypting a CSFB terminal voice call applied to a calling terminal in an embodiment of the present invention, the apparatus includes:
a starting module 301, configured to start a procedure of initiating a voice encrypted call to a called terminal;
the first processing module 302 is configured to receive a redirection message sent by an LTE network, and set a priority of a 3G frequency point to be higher than a priority of a 2G frequency point in the redirection message;
and a second processing module 303, configured to drop back to the 3G cell according to the redirection message, and perform voice encryption call.
Optionally, the first processing module 302 is further configured to fill a fallback 3G frequency point in the redirection message.
Optionally, the first processing module 302 is further configured to fill the 3G frequency point in the system message as a fallback-able 3G frequency point; and/or presetting known 3G frequency points, and filling the known 3G frequency points into 3G frequency points which can fall back.
Optionally, the first processing module 302 is further configured to fill fallback 3G frequency points in a Freq Priority ListUTRA-FDD field and a Freq Priority ListUTRA-TDD field in the redirection message.
Optionally, the second processing module 303 is further configured to search for a fallback cell according to the redirection message, and if a valid 3G frequency point is searched, fallback to the searched 3G cell, and perform voice encrypted call; and if the effective 3G frequency point cannot be searched, the voice encryption conversation fails.
According to another aspect of the present invention, there is also provided a calling terminal, which includes a CSFB terminal voice call encryption apparatus applied to the calling terminal.
As shown in fig. 7, which is a block diagram illustrating a structure of an apparatus for encrypting a voice call of a CSFB terminal applied to a called terminal in an embodiment of the present invention, the apparatus includes:
a receiving module 401, configured to receive a page of a calling terminal on an LTE network;
a third processing module 402, configured to receive a redirection message sent by an LTE network, and set a priority of a 3G frequency point to be higher than a priority of a 2G frequency point in the redirection message;
and a fourth processing module 403, configured to drop back to the 3G cell according to the redirection message, and perform voice encrypted call.
Optionally, the third processing module 402 is further configured to fill a fallback 3G frequency point in the redirection message.
Optionally, the third processing module 402 is further configured to fill the 3G frequency point in the system message as a fallback-able 3G frequency point; and/or presetting known 3G frequency points, and filling the known 3G frequency points into 3G frequency points which can fall back.
Optionally, the third processing module 402 is further configured to fill fallback 3G frequency points in a Freq Priority ListUTRA-FDD field and a Freq Priority ListUTRA-TDD field in the redirection message.
Optionally, the fourth processing module 403 is further configured to search a fallback cell according to the redirection message, and if a valid 3G frequency point is searched, fallback to the searched 3G cell, and perform voice encrypted call; and if the effective 3G frequency point cannot be searched, searching the 2G frequency point and falling back to the searched 2G cell.
According to another aspect of the present invention, there is also provided a called terminal including means for applying to a CSFB terminal voice call encryption of the called terminal.
While the preferred embodiments of the present invention have been described, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims.
Claims (22)
1. A circuit switched fallback CSFB terminal voice call encryption method is applied to a calling terminal, and the calling terminal is suitable for being accessed to an LTE network with 2G and 3G wireless frequency points, and is characterized by comprising the following steps:
starting a flow of initiating a voice encryption call to a called terminal;
receiving a redirection message issued by an LTE network, and setting the priority of a 3G frequency point to be higher than the priority of a 2G frequency point in the redirection message by a calling terminal;
and returning to the 3G cell according to the redirection message, and carrying out voice encryption communication.
2. The method according to claim 1, wherein in the step of setting the priority of the 3G frequency point to be higher than the priority of the 2G frequency point in the redirection message, the method further comprises:
and filling 3G frequency points which can fall back into the redirection message.
3. The method according to claim 2, wherein the simultaneously filling the fallback 3G frequency points in the redirection message specifically includes:
filling the 3G frequency points in the system message into 3G frequency points which can fall back; and/or
Presetting a known 3G frequency point, and filling the known 3G frequency point into a 3G frequency point which can fall back.
4. The method according to claim 2, wherein the step of filling the fallback 3G frequency points in the redirection message at the same time specifically comprises:
and filling 3G frequency points which can be fallen back in an Freq Priority List UTRA-FDD field and an Freq Priority List UTRA-TDD field in the redirection message.
5. The method according to claim 1, wherein performing a voice encrypted call according to the redirection message falling back to the 3G cell specifically comprises:
searching a fallback cell according to the redirection message, if an effective 3G frequency point is searched, fallback to the searched 3G cell, and carrying out voice encryption conversation; and if the effective 3G frequency point cannot be searched, the voice encryption conversation fails.
6. A CSFB terminal voice call encryption method is applied to a called terminal, the called terminal is suitable for an LTE network accessing 2G and 3G wireless frequency points, and the method is characterized by comprising the following steps:
receiving a page of a calling terminal on the LTE network;
receiving a redirection message issued by an LTE network, and setting the priority of a 3G frequency point to be higher than the priority of a 2G frequency point in the redirection message by a called terminal;
and returning to the 3G cell according to the redirection message, and carrying out voice encryption communication.
7. The method according to claim 6, wherein in the step of setting the priority of the 3G frequency point to be higher than the priority of the 2G frequency point in the redirection message, the method further comprises:
and filling 3G frequency points which can fall back into the redirection message.
8. The method according to claim 7, wherein the simultaneously filling the fallback 3G frequency points in the redirection message specifically includes:
filling the 3G frequency points in the system message into 3G frequency points which can fall back; and/or
Presetting a known 3G frequency point, and filling the known 3G frequency point into a 3G frequency point which can fall back.
9. The method according to claim 7, wherein the filling of the fallback 3G frequency points in the redirection message at the same time specifically includes:
and filling 3G frequency points which can be fallen back in an Freq Priority List UTRA-FDD field and an Freq Priority List UTRA-TDD field in the redirection message.
10. The method according to claim 6, wherein performing a voice encrypted call according to the redirection message falling back to the 3G cell specifically comprises:
searching a fallback cell according to the redirection message, if an effective 3G frequency point is searched, fallback to the searched 3G cell, and carrying out voice encryption conversation; and if the effective 3G frequency point cannot be searched, searching the 2G frequency point and falling back to the searched 2G cell.
11. The utility model provides a CSFB terminal voice call encryption's device, is applied to the calling terminal who inserts the LTE network at 2G and 3G wireless frequency point, its characterized in that, the device includes:
the starting module is used for starting a flow of initiating a voice encryption call to a called terminal;
the first processing module is used for receiving a redirection message issued by an LTE network, and the first processing module sets the priority of a 3G frequency point to be higher than the priority of a 2G frequency point in the redirection message;
and the second processing module is used for falling back to the 3G cell according to the redirection message to carry out voice encryption communication.
12. The apparatus of claim 11, wherein the first processing module is further configured to fill fallback 3G frequency points in the redirection message.
13. The apparatus of claim 12, wherein the first processing module is further configured to fill a 3G frequency point in a system message as a fallback 3G frequency point; and/or presetting known 3G frequency points, and filling the known 3G frequency points into 3G frequency points which can fall back.
14. The apparatus of claim 12, wherein the first processing module is further configured to fill fallback 3G frequency bins in Freq Priority List UTRA-FDD and Freq Priority List UTRA-TDD fields in the redirection message.
15. The apparatus according to claim 11, wherein the second processing module is further configured to search for a fallback cell according to the redirection message, and if a valid 3G frequency point is searched, fallback to the searched 3G cell to perform a voice encrypted call; and if the effective 3G frequency point cannot be searched, the voice encryption conversation fails.
16. A calling terminal, characterized in that the calling terminal comprises a device for voice call encryption of a CSFB terminal according to any one of claims 11 to 15.
17. A CSFB terminal voice call encryption device is applied to a called terminal of an LTE network accessing 2G and 3G wireless frequency points, and is characterized in that the device comprises:
a receiving module, configured to receive a page of a calling terminal on the LTE network;
the third processing module is used for receiving a redirection message issued by an LTE network, and the third processing module sets the priority of a 3G frequency point to be higher than the priority of a 2G frequency point in the redirection message;
and the fourth processing module is used for falling back to the 3G cell according to the redirection message to carry out voice encryption communication.
18. The apparatus of claim 17, wherein the third processing module is further configured to fill fallback 3G frequency points in the redirection message.
19. The apparatus of claim 18, wherein the third processing module is further configured to fill a 3G frequency point in a system message as a fallback 3G frequency point; and/or presetting known 3G frequency points, and filling the known 3G frequency points into 3G frequency points which can fall back.
20. The apparatus of claim 18, wherein the third processing module is further configured to fill fallback 3G frequency bins in Freq Priority List UTRA-FDD and Freq Priority List UTRA-TDD fields in the redirection message.
21. The apparatus according to claim 17, wherein the fourth processing module is further configured to search for a fallback cell according to the redirection message, and if a valid 3G frequency point is searched, fallback to the searched 3G cell to perform a voice encrypted call; and if the effective 3G frequency point cannot be searched, searching the 2G frequency point and falling back to the searched 2G cell.
22. A called terminal, characterized in that the called terminal comprises a CSFB terminal voice call encryption device as claimed in any one of claims 17 to 21.
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| WO2019061431A1 (en) * | 2017-09-30 | 2019-04-04 | 深圳市云中飞网络科技有限公司 | Method and device for detecting fallback result of csfb, and computer storage medium |
| CN112333789A (en) * | 2020-11-16 | 2021-02-05 | 中国联合网络通信集团有限公司 | Calling method, calling device and terminal |
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| CN103108402A (en) * | 2011-11-11 | 2013-05-15 | 中兴通讯股份有限公司 | Voice service implementation method, voice fall back implementation terminal and system thereof |
| CN103229554A (en) * | 2012-12-27 | 2013-07-31 | 华为技术有限公司 | Communication method and communication device both based on redirected circuit switched fallback |
| CN103607783A (en) * | 2013-12-06 | 2014-02-26 | 中国联合网络通信集团有限公司 | CSFB (Circuit Switched Domain Fall Back) call establishment method and user equipment |
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| US9526038B2 (en) * | 2013-04-02 | 2016-12-20 | Apple Inc. | Circuit-switched fallback (CSFB) call setup utilizing multiple RF receive chains |
| CN104471979B (en) * | 2013-06-13 | 2019-05-10 | 华为技术有限公司 | A kind of method of network switching, equipment and system |
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| CN103108402A (en) * | 2011-11-11 | 2013-05-15 | 中兴通讯股份有限公司 | Voice service implementation method, voice fall back implementation terminal and system thereof |
| CN103229554A (en) * | 2012-12-27 | 2013-07-31 | 华为技术有限公司 | Communication method and communication device both based on redirected circuit switched fallback |
| CN103607783A (en) * | 2013-12-06 | 2014-02-26 | 中国联合网络通信集团有限公司 | CSFB (Circuit Switched Domain Fall Back) call establishment method and user equipment |
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