CN104936245B - Implementation method, system and the terminal of SRVCC - Google Patents

Abstract

The invention discloses the implementation methods of single wireless mode continuous voice call SRVCC a kind of, include: terminal LTE module SRVCC order is received by the first radio-frequency channel after, by in the SRVCC order 2G/3G target frequency point and target cell information be sent to the 2G/3G module of terminal, and carrying relevant treatment is carried out to other Deta bearers in addition to voice bearer according to the coverage condition of LTE network；The 2G/3G module carries out random access by the second radio-frequency channel on corresponding Target cell, and sends SRVCC switching and complete order.The present invention discloses a kind of terminal and the realization systems of SRVCC.

Description

Method, system and terminal for realizing SRVCC

Technical Field

The present invention relates to wireless communication technologies, and in particular, to a method, a system, and a terminal for implementing Single Radio Voice Call Continuity (SRVCC).

Background

The third Generation Partnership Project (3 GPP) standard specifies: a Voice over LTE (VoLTE) terminal should support a Circuit Switched Fallback (CSFB) mode and a second generation/third generation (2G/3G) mode.

When the terminal is under the coverage of the VoLTE network, the VoLTE terminal works in a VoLTE mode; when the terminal is under the coverage of a CSFB network which does not support the VoLTE function, the VoLTE terminal works in a CSFB mode; when under the coverage of a 2G/3G network, the VoLTE terminal works in a 2G/3G mode. According to the 3GPP standard: when a VoLTE terminal moves from a VoLTE network coverage area to a 2G/3G network coverage area while a VoLTE call is in progress, the call should be Switched from VoLTE voice to a Circuit Switched Domain (CS) call of the 2G/3G network by SRVCC technology to maintain voice continuity.

Meanwhile, the 3GPP standards also specify: when the VoLTE terminal is at the VoLTE network coverage area edge or the CSFB network coverage area edge, the SRVCC procedure also needs to be initiated to maintain voice continuity. For example, when a VoLTE terminal is in a VoLTE call and moves from a VoLTE network coverage area to a CSFB network coverage area, that is: when the VoLTE terminal is at the edge of the VoLTE network coverage area, since the CSFB network coverage area does not support the VoLTE function, the evolved Node B (eNB) needs to initiate an SRVCC procedure to switch the VoLTE call to a 2G/3G CS call, thereby maintaining voice continuity. However, at this time, since the VoLTE terminal is still in the coverage area of the LTE network, after the technical scheme of the existing SRVCC is adopted, the VoLTE terminal cannot perform a data voice concurrent service.

Disclosure of Invention

In order to solve the existing technical problem, embodiments of the present invention provide a method, a system, and a terminal for implementing SRVCC.

The embodiment of the invention provides a method for realizing SRVCC, which comprises the following steps:

after receiving an SRVCC command through a first radio frequency channel, an LTE module of a terminal sends a 2G/3G target frequency point and target cell information in the SRVCC command to the 2G/3G module of the terminal, and carries out bearing related processing on other data bearers except voice bearers according to the coverage condition of an LTE network;

and the 2G/3G module performs random access on the corresponding target cell through a second radio frequency channel and sends an SRVCC switching completion command.

In the above solution, before the sending the 2G/3G target frequency point and the target cell information in the SRVCC command to the 2G/3G module of the terminal, the method further includes:

the LTE module analyzes the SRVCC command;

correspondingly, the LTE module sends the analyzed 2G/3G target frequency point and the target cell information to the 2G/3G module.

In the above scheme, the method further comprises:

when the terminal is in power-on attachment or tracking area update TAU, the LTE module reports 2G, 3G and 4G measurement capability and dual radio frequency channel capability of the terminal to a first network side on the first radio frequency channel, and the 2G/3G module reports 2G/3G single-mode measurement capability to a second network side on the second radio frequency channel.

In the foregoing solution, before the LTE module of the terminal receives the SRVCC command through the first radio frequency channel, the method further includes:

the LTE module sends a measurement result meeting a switching threshold and a corresponding frequency point to the first network side; wherein,

the measurement result meeting the switching threshold and the corresponding frequency points are as follows: and obtaining a measurement result meeting a switching threshold and a corresponding frequency point according to a 2G/3G adjacent cell frequency point list configured for the terminal by the first network side and the switching threshold.

In the above scheme, the method further comprises:

when the terminal is in a coverage area of a VoLTE network, the LTE module is attached to the LTE network and occupies the first radio frequency channel; the 2G/3G module is attached to the 2G/3G network and occupies a second channel.

In the foregoing solution, the performing bearer-related processing on other data bearers except for the voice bearer according to the coverage of the LTE network includes:

and the LTE module suspends the other data bearers, judges whether an LTE frequency point meeting the residence condition exists or not, and recovers the other data bearers or works in an off-line state according to the judgment result.

In the foregoing solution, the determining whether there is an LTE frequency point meeting the LTE retention condition, and recovering the other data bearers or working in the offline state according to the determination result includes:

and measuring the Reference Signal Received Power (RSRP) of the self-attached service frequency point, and when the service frequency point meets the LTE resident condition according to the measurement result, recovering the other suspended data bearers by the LTE module.

In the foregoing solution, the determining whether there is an LTE frequency point meeting the LTE retention condition, and recovering the other data bearers or working in the offline state according to the determination result includes:

the method comprises the steps of measuring RSRP of service frequency points attached to the LTE module, searching the LTE frequency points attached to the LTE module within preset time when the service frequency points do not meet LTE residence conditions according to measurement results, and recovering other hung data bearers after the LTE module completes a random access process on the LTE frequency points meeting the LTE residence conditions when the LTE frequency points meeting the LTE residence conditions are determined to exist in the attached LTE frequency points.

In the foregoing solution, the determining whether there is an LTE frequency point meeting the LTE retention condition, and recovering the other data bearers or working in the offline state according to the determination result includes:

the method comprises the steps of measuring RSRP of service frequency points attached to the LTE module, searching the LTE frequency points attached to the LTE module within preset time when the service frequency points do not meet LTE residence conditions according to measurement results, and working the LTE module in an off-line state when the LTE frequency points which do not meet the LTE residence conditions are determined in the attached LTE frequency points.

In the above scheme, the LTE module resumes the suspended other data bearers through a tracking area update TAU procedure.

In the foregoing solution, the performing, by the 2G/3G module, random access on the corresponding target cell through the second radio frequency channel includes:

the 2G/3G module modulates the frequency of the second radio frequency channel to the target frequency point;

and the 2G/3G module performs a random access process on the second radio frequency channel and the target cell.

The embodiment of the invention also provides a method for realizing the SRVCC, which comprises the following steps:

after receiving an SRVCC command from a first network side through a first radio frequency channel, an LTE module of the terminal sends a 2G/3G target frequency point and target cell information in the SRVCC command to the 2G/3G module of the terminal, and carries out bearing related processing on other data bearings except voice bearings according to the coverage condition of the LTE network;

and the 2G/3G module performs random access on the corresponding target cell through a second radio frequency channel and sends an SRVCC switching completion command.

In the above solution, before the sending the 2G/3G target frequency point and the target cell information in the SRVCC command to the 2G/3G module of the terminal, the method further includes:

the LTE module analyzes the SRVCC command;

correspondingly, the LTE module sends the analyzed 2G/3G target frequency point and the target cell information to the 2G/3G module.

In the above scheme, the method further comprises:

when the terminal is in a startup attachment state or a Tracking Area Update (TAU) state, the LTE module reports 2G, 3G, and 4G measurement capabilities and dual radio frequency channel capabilities of the terminal to the first network side on the first radio frequency channel, and the 2G/3G module reports 2G/3G single mode measurement capabilities to the second network side on the second radio frequency channel.

In the above scheme, the method further comprises:

the first network side configures a 2G/3G adjacent cell frequency point list and a switching threshold for the terminal;

the LTE module sends a measurement result meeting a switching threshold and a corresponding frequency point to the first network side; wherein,

the measurement result meeting the switching threshold and the corresponding frequency points are as follows: and obtaining a measurement result meeting a switching threshold and a corresponding frequency point according to a 2G/3G adjacent cell frequency point list configured for the terminal by the first network side and the switching threshold.

In the above scheme, the method further comprises:

when the terminal is in a coverage area of a VoLTE network, the LTE module is attached to the LTE network and occupies the first radio frequency channel; the 2G/3G module is attached to the 2G/3G network and occupies a second channel.

In the foregoing solution, the performing bearer-related processing on other data bearers except for the voice bearer according to the coverage of the LTE network includes:

and the LTE module suspends the other data bearers, judges whether an LTE frequency point meeting the residence condition exists or not, and recovers the other data bearers or works in an off-line state according to the judgment result.

In the foregoing solution, the determining whether there is an LTE frequency point meeting the LTE retention condition, and recovering the other data bearers or working in the offline state according to the determination result includes:

and measuring the RSRP of the self-attached service frequency point, and when the service frequency point is determined to meet the LTE resident condition according to the measurement result, the LTE module recovers the other suspended data bearers.

In the foregoing solution, the determining whether there is an LTE frequency point meeting the LTE retention condition, and recovering the other data bearers or working in the offline state according to the determination result includes:

the method comprises the steps of measuring RSRP of service frequency points attached to the LTE module, searching the LTE frequency points attached to the LTE module within preset time when the service frequency points do not meet LTE residence conditions according to measurement results, and recovering other hung data bearers after the LTE module completes a random access process on the LTE frequency points meeting the LTE residence conditions when the LTE frequency points meeting the LTE residence conditions are determined to exist in the attached LTE frequency points.

In the foregoing solution, the determining whether there is an LTE frequency point meeting the LTE retention condition, and recovering the other data bearers or working in the offline state according to the determination result includes:

the method comprises the steps of measuring RSRP of service frequency points attached to the LTE module, searching the LTE frequency points attached to the LTE module within preset time when the service frequency points do not meet LTE residence conditions according to measurement results, and working the LTE module in an off-line state when the LTE frequency points which do not meet the LTE residence conditions are determined in the attached LTE frequency points.

In the above scheme, the LTE module resumes the suspended other data bearers through a TAU procedure.

In the foregoing solution, the performing, by the 2G/3G module, random access on the corresponding target cell through the second radio frequency channel includes:

the 2G/3G module modulates the frequency of the second radio frequency channel to the target frequency point;

and the 2G/3G module performs a random access process on the second radio frequency channel and the target cell.

An embodiment of the present invention further provides a terminal, including: a first LTE module and a first 2G/3G module; wherein,

the first LTE module is used for sending the 2G/3G target frequency point and the target cell information in the SRVCC command to the first 2G/3G module after receiving the SRVCC command through a first radio frequency channel, and carrying out carrying related processing on other data bearers except voice bearer according to the coverage condition of the LTE network;

and the first 2G/3G module is used for receiving the 2G/3G target frequency point and the target cell information sent by the first LTE module, performing random access on the corresponding target cell through a second radio frequency channel, and sending an SRVCC switching completion command.

In the above scheme, the first LTE module is further configured to analyze the SRVCC command, and correspondingly, send the analyzed 2G/3G target frequency point and target cell information to the first 2G/3G module.

In the above scheme, the first LTE module is further configured to report, when the terminal is powered on for attachment or performs TAU, the 2G, 3G, and 4G measurement capabilities and the dual radio frequency channel capability of the terminal to a first network side on the first radio frequency channel;

correspondingly, the 2G/3G module is further configured to report the 2G/3G single-mode measurement capability to a second network side on the second radio frequency channel when the terminal performs power-on attachment or performs TAU.

In the above scheme, the first LTE module is further configured to send a measurement result meeting a handover threshold and a corresponding frequency point to the first network side before receiving the SRVCC command through the first radio frequency channel; wherein,

the measurement result meeting the switching threshold and the corresponding frequency points are as follows: and obtaining a measurement result meeting a switching threshold and a corresponding frequency point according to a 2G/3G adjacent cell frequency point list configured for the terminal by the first network side and the switching threshold.

In the above scheme, the first LTE module is further configured to attach to an LTE network and occupy the first radio frequency channel when the terminal is in a coverage area of a VoLTE network;

correspondingly, the first 2G/3G module is also used for attaching to the 2G/3G network and occupying a second channel when the terminal is in the coverage area of the VoLTE network.

An embodiment of the present invention further provides a system for implementing SRVCC, including: a first network side and a terminal; the terminal includes: a second LTE module and a second 2G/3G module; wherein,

the first network side is used for sending an SRVCC command to the terminal;

the second LTE module is used for sending the 2G/3G target frequency point and the target cell information in the SRVCC command to the second 2G/3G module after receiving the SRVCC command from the first network side through the first radio frequency channel, and carrying out bearing related processing on other data bearings except voice bearing according to the coverage condition of the LTE network;

and the second 2G/3G module is used for receiving the 2G/3G target frequency point and the target cell information sent by the second LTE module, performing random access on the corresponding target cell through a second radio frequency channel, and sending an SRVCC switching completion command.

In the above scheme, the second LTE module is further configured to analyze the SRVCC command, and correspondingly, send the analyzed 2G/3G target frequency point and target cell information to the second 2G/3G module.

In the above solution, the system further includes: a second network side; wherein,

the second LTE module is further configured to report, to the first network side, 2G, 3G, and 4G measurement capabilities and dual radio frequency channel capabilities of the terminal on the first radio frequency channel when the terminal is powered on for attachment or performs TAU;

correspondingly, the second 2G/3G module is further configured to report the 2G/3G single-mode measurement capability to the second network side on the second radio frequency channel when the terminal performs the power-on attachment or the TAU and when the terminal performs the power-on attachment or the TAU.

In the above scheme, the first network side is further configured to configure a 2G/3G neighbor frequency point list and a switching threshold for the terminal; receiving the measurement result and the corresponding frequency point sent by the second LTE module;

the second LTE module is further configured to send a measurement result meeting a handover threshold and a corresponding frequency point to the first network side; wherein,

the measurement result meeting the switching threshold and the corresponding frequency points are as follows: and obtaining a measurement result meeting a switching threshold and a corresponding frequency point according to a 2G/3G adjacent cell frequency point list configured for the terminal by the first network side and the switching threshold.

In the above scheme, the second LTE module is further configured to attach to an LTE network and occupy the first radio frequency channel when the terminal is in a coverage area of a VoLTE network;

correspondingly, the second 2G/3G module is also used for attaching to the 2G/3G network and occupying a second channel when the terminal is in the coverage area of the VoLTE network.

According to the SRVCC realization method, the SRVCC realization system and the SRVCC realization terminal provided by the embodiment of the invention, after an LTE module of the terminal receives an SRVCC command through a first radio frequency channel, a 2G/3G target frequency point and target cell information in the SRVCC command are sent to the 2G/3G module of the terminal, and other data bearers except voice bearers are carried out with relevant processing according to the coverage condition of an LTE network; the terminal of the embodiment of the invention is a VoLTE dual standby terminal, so that when the terminal is positioned at the edge of a VoLTE network coverage area or the edge of a CSFB network coverage area, a data service can be quickly returned in the SRVCC process, a data and voice concurrent service is realized, a user can enjoy a high-speed data service brought by an LTE network, and the user experience is further improved.

Drawings

In the drawings, which are not necessarily drawn to scale, like reference numerals may describe similar components in different views. Like reference numerals having different letter suffixes may represent different examples of similar components. The drawings illustrate generally, by way of example, but not by way of limitation, various embodiments discussed herein.

Fig. 1 is a schematic flow chart of an implementation method of SRVCC in an embodiment of the present invention;

fig. 2 is a schematic flow chart of another SRVCC implementing method according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a terminal structure according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of an implementation system of SRVCC in the embodiment of the present invention.

Detailed Description

The method for realizing SRVCC in the existing VoLTE scene mainly comprises the following steps:

step 1: the LTE network side configures a 2G/3G adjacent cell frequency point list and a switching threshold for the terminal;

step 2: after receiving the configured 2G/3G adjacent cell frequency point list and the switching threshold, an LTE module of the terminal reports a measurement result and a frequency point meeting the measurement threshold to an LTE network side;

and step 3: the LTE network side sends an SRVCC switching command to the terminal according to the measurement result and the frequency point reported by the terminal, wherein the SRVCC switching command carries a switched 2G/3G target frequency point;

and 4, step 4: after receiving the SRVCC switching command, an LTE module of the terminal transmits a target frequency point contained in the SRVCC switching command and information of a corresponding target cell to a 2G/3G module of the terminal;

and 5: after receiving the information of the target frequency point and the corresponding target cell, a 2G/3G module of the terminal occupies a radio frequency channel and tunes the channel of the radio frequency channel to the target frequency point;

step 6: after the random access is successfully carried out on the 2G/3G target frequency point, the 2G/3G module of the terminal sends an SRVCC switching completion message to the 2G/3G network side.

As can be seen from the above description, the conventional VoLTE terminal is a single standby terminal and has only one set of radio frequency system, so that when the VoLTE terminal is located at the edge of the coverage area of the VoLTE network or at the edge of the coverage area of the CSFB network, because the VoLTE terminal is still located in the coverage area of the LTE network at this time, the VoLTE terminal cannot perform concurrent data and voice services, and thus cannot enjoy high-speed data services brought by the LTE network.

Based on this, in various embodiments of the invention: after receiving an SRVCC command through a first radio frequency channel, an LTE module of a terminal sends a 2G/3G target frequency point and target cell information in the SRVCC command to the 2G/3G module of the terminal, and carries out bearing related processing on other data bearings except voice bearings according to the coverage condition of an LTE network; and the 2G/3G module performs random access through a second radio frequency channel and sends an SRVCC switching completion command.

The invention is described in further detail below with reference to the figures and the embodiments.

An implementation method of SRVCC in an embodiment of the present invention is applied to a VoLTE scenario, and as shown in fig. 1, the method includes the following steps:

step 101: after receiving an SRVCC command through a first radio frequency channel, an LTE module of a terminal sends a 2G/3G target frequency point and target cell information in the SRVCC command to the 2G/3G module of the terminal, and carries out bearing related processing on other data bearers except voice bearers according to the coverage condition of an LTE network;

here, the LTE module refers to: a module required for enabling the terminal to work under an LTE network;

accordingly, the 2G/3G module refers to: and the module is required for enabling the terminal to work under the 2G/3G network.

The terminal provided by the embodiment of the invention is a VoLTE dual standby terminal, namely, the terminal supports a CSFB mode and a 2G/3G mode, and the terminal is provided with an LTE module and a 2G module, or the terminal is provided with an LTE module and a 3G module. When the 2G/3G module is a 2G module, after the LTE module receives an SRVCC command through a first radio frequency channel, the 2G target frequency point and target cell information in the SRVCC command are sent to the 2G module of the terminal; and when the 2G/3G module is a 3G module, after the LTE module receives the SRVCC command through the first radio frequency channel, the 3G target frequency point and the target cell information in the SRVCC command are sent to the 3G module of the terminal.

Before sending the 2G/3G target frequency point and the target cell information in the SRVCC command to the 2G/3G module of the terminal, the method may further include:

the LTE module analyzes the SRVCC command, and correspondingly, the LTE module sends the analyzed 2G/3G target frequency point and target cell information to the 2G/3G module so that the 2G/3G module can identify the 2G/3G target frequency point and the target cell information in the SRVCC command.

Before performing step 101, the method may further comprise:

when the terminal is in a coverage area of a VoLTE network, the LTE module is attached to the LTE network and occupies the first radio frequency channel; the 2G/3G module is attached to the 2G/3G network and occupies a second channel.

Before performing step 101, the method may further comprise:

when the terminal is started to attach or performs TAU, the LTE module reports 2G, 3G and 4G measurement capabilities and the dual radio frequency channel capability of the terminal to a first network side on the first radio frequency channel, and the 2G/3G module reports 2G/3G single-mode measurement capabilities to a second network side on the second radio frequency channel, so that the terminal can smoothly complete SRVCC.

The first network side is a network side corresponding to the LTE module, namely an LTE network side; the second network side is a network side corresponding to the 2G/3G module, namely a 2G/3G network side. Here, the network side refers to a network side device, such as a base station.

Before performing step 101, the method may further comprise:

the LTE module sends a measurement result meeting a switching threshold and a corresponding frequency point to the first network side so that the first network side can send an SRVCC command carrying a 2G/3G target frequency point and target cell information to the terminal; the measurement result meeting the switching threshold and the corresponding frequency point are obtained according to a 2G/3G adjacent cell frequency point list configured for the terminal by the first network side and the switching threshold; here, the time for the first network side to configure the 2G/3G neighbor frequency point list and the switching threshold for the terminal may be determined as needed, that is, the time for triggering the first network side to configure the 2G/3G neighbor frequency point list and the switching threshold for the terminal may be determined as needed.

The carrying related processing of other data bearers besides the voice bearer according to the coverage condition of the LTE network specifically includes:

the LTE module suspends the other data bearers, judges whether an LTE frequency point meeting a residence condition exists or not, and recovers the other data bearers or works in an off-line state according to a judgment result;

wherein the suspending the other data bearers means: no further data processing is performed.

Judging whether an LTE frequency point meeting the LTE residence condition exists, and recovering the other data bearing or working in the off-line state according to the judgment result, wherein the judging specifically comprises the following steps:

measuring the RSRP of the self-attached service frequency point, and when the service frequency point is determined to meet the LTE resident condition according to the measurement result, the LTE module recovers the other suspended data bearers; or,

measuring RSRP of service frequency points attached to the LTE module, searching the LTE frequency points attached to the LTE module within preset time when the service frequency points are determined not to meet LTE residence conditions according to measurement results, and recovering the other suspended data bearers after the LTE module completes a random access process on the LTE frequency points meeting the LTE residence conditions when the LTE frequency points meeting the LTE residence conditions are determined to exist in the attached LTE frequency points; or,

the method comprises the steps of measuring RSRP of service frequency points attached to the LTE module, searching the LTE frequency points attached to the LTE module within preset time when the service frequency points do not meet LTE residence conditions according to measurement results, and working the LTE module in an off-line state when the LTE frequency points which do not meet the LTE residence conditions are determined in the attached LTE frequency points.

The specific implementation of determining whether the serving frequency point meets the LTE camping condition according to the measurement result is a technical means commonly used by those skilled in the art, and details are not described here.

The specific implementation of determining whether there is an LTE frequency point satisfying the LTE camping condition in the attached LTE frequency points is a technical means commonly used by those skilled in the art, and is not described herein again.

The preset time can be set according to needs, such as: 2 hours, etc.

In actual application, the LTE module may resume the other data bearers suspended through TAU procedures.

Step 102: and the 2G/3G module performs random access on the corresponding target cell through a second radio frequency channel and sends an SRVCC switching completion command.

Here, the random access of the 2G/3G module on the corresponding target cell through the second radio frequency channel specifically includes:

the 2G/3G module modulates the frequency of the second radio frequency channel to the target frequency point;

and the 2G/3G module performs a random access process on the second radio frequency channel and the target cell.

The sending of the SRVCC handover complete command means: and the 2G/3G module sends an SRVCC switching completion command to the second network side.

As can be seen from the above description, the terminal according to the embodiment of the present invention is a VoLTE dual standby terminal, and the method according to the embodiment of the present invention can quickly recover a data service when the terminal is located at the edge of a VoLTE network coverage area or at the edge of a CSFB network coverage area, so as to implement a data and voice concurrent service, so that a user can enjoy a high-speed data service provided by an LTE network, thereby improving user experience.

Another SRVCC implementation method in the embodiment of the present invention is applied to a VoLTE scenario, and as shown in fig. 2, the method includes the following steps:

step 201: after receiving an SRVCC command from a first network side through a first radio frequency channel, an LTE module of the terminal sends a 2G/3G target frequency point and target cell information in the SRVCC command to the 2G/3G module of the terminal, and carries out bearing related processing on other data bearings except voice bearings according to the coverage condition of the LTE network;

here, the LTE module refers to: a module required for enabling the terminal to work under an LTE network;

accordingly, the 2G/3G module refers to: and the module is required for enabling the terminal to work under the 2G/3G network.

The terminal provided by the embodiment of the invention is a VoLTE dual standby terminal, namely, the terminal supports a CSFB mode and a 2G/3G mode, and the terminal is provided with an LTE module and a 2G module, or the terminal is provided with an LTE module and a 3G module. When the 2G/3G module is a 2G module, after receiving an SRVCC command from a first network side through a first radio frequency channel, the LTE module sends a 2G target frequency point and target cell information in the SRVCC command to the 2G module of the terminal; when the 2G/3G module is a 3G module, after the LTE module receives an SRVCC command from a first network side through a first radio frequency channel, the 3G target frequency point and the target cell information in the SRVCC command are sent to the 3G module of the terminal.

Before sending the 2G/3G target frequency point and the target cell information in the SRVCC command to the 2G/3G module of the terminal, the method may further include:

the LTE module analyzes the SRVCC command, and correspondingly, the LTE module sends the analyzed 2G/3G target frequency point and target cell information to the 2G/3G module so that the 2G/3G module can identify the 2G/3G target frequency point and the target cell information in the SRVCC command.

Before performing step 201, the method may further include:

when the terminal is in a coverage area of a VoLTE network, the LTE module is attached to the LTE network and occupies the first radio frequency channel; the 2G/3G module is attached to the 2G/3G network and occupies a second channel.

Before performing step 201, the method may further include:

when the terminal is started to attach or performs TAU, the LTE module reports 2G, 3G and 4G measurement capabilities and the dual radio frequency channel capability of the terminal to a first network side on the first radio frequency channel, and the 2G/3G module reports 2G/3G single-mode measurement capabilities to a second network side on the second radio frequency channel, so that the terminal can smoothly complete SRVCC.

The first network side is a network side corresponding to the LTE module, namely an LTE network side; the second network side is a network side corresponding to the 2G/3G module, namely a 2G/3G network side. Here, the network side refers to a network side device, such as a base station.

The method may further comprise:

the first network side configures a 2G/3G adjacent cell frequency point list and a switching threshold for the terminal;

the LTE module sends a measurement result meeting a switching threshold and a corresponding frequency point to the first network side so that the first network side can send an SRVCC command carrying a 2G/3G target frequency point and target cell information to the terminal; the time for the first network side to configure the 2G/3G neighbor frequency point list and the switching threshold for the terminal may be determined as needed, that is, the time for triggering the first network side to configure the 2G/3G neighbor frequency point list and the switching threshold for the terminal may be determined as needed.

The measurement result meeting the switching threshold and the corresponding frequency point are obtained according to a 2G/3G adjacent region frequency point list configured for the terminal by the first network side and the switching threshold.

The carrying related processing of other data bearers besides the voice bearer according to the coverage condition of the LTE network specifically includes:

the LTE module suspends the other data bearers, judges whether an LTE frequency point meeting a residence condition exists or not, and recovers the other data bearers or works in an off-line state according to a judgment result;

wherein the suspending the other data bearers means: no further data processing is performed.

Judging whether an LTE frequency point meeting the LTE residence condition exists, and recovering the other data bearing or working in the off-line state according to the judgment result, wherein the judging specifically comprises the following steps:

measuring the RSRP of the self-attached service frequency point, and when the service frequency point is determined to meet the LTE resident condition according to the measurement result, the LTE module recovers the other suspended data bearers; or,

measuring RSRP of service frequency points attached to the LTE module, searching the LTE frequency points attached to the LTE module within preset time when the service frequency points are determined not to meet LTE residence conditions according to measurement results, and recovering the other suspended data bearers after the LTE module completes a random access process on the LTE frequency points meeting the LTE residence conditions when the LTE frequency points meeting the LTE residence conditions are determined to exist in the attached LTE frequency points; or,

the method comprises the steps of measuring RSRP of service frequency points attached to the LTE module, searching the LTE frequency points attached to the LTE module within preset time when the service frequency points do not meet LTE residence conditions according to measurement results, and working the LTE module in an off-line state when the LTE frequency points which do not meet the LTE residence conditions are determined in the attached LTE frequency points.

The specific implementation of determining whether the serving frequency point meets the LTE camping condition according to the measurement result is a technical means commonly used by those skilled in the art, and details are not described here.

The specific implementation of determining whether there is an LTE frequency point satisfying the LTE camping condition in the attached LTE frequency points is a technical means commonly used by those skilled in the art, and is not described herein again.

The preset time can be set according to needs, such as: 2 hours, etc.

In actual application, the LTE module may resume the other data bearers suspended through TAU procedures.

Step 202: and the 2G/3G module performs random access on the corresponding target cell through a second radio frequency channel and sends an SRVCC switching completion command.

Here, the random access of the 2G/3G module on the corresponding target cell through the second radio frequency channel specifically includes:

the 2G/3G module modulates the frequency of the second radio frequency channel to the target frequency point;

and the 2G/3G module performs a random access process with the target cell on the second radio frequency channel.

The sending of the SRVCC handover complete command means: and the 2G/3G module sends an SRVCC switching completion command to the second network side.

As can be seen from the above description, the terminal according to the embodiment of the present invention is a VoLTE dual standby terminal, and the method according to the embodiment of the present invention can quickly recover a data service when the terminal is located at the edge of a VoLTE network coverage area or at the edge of a CSFB network coverage area, so as to implement a data and voice concurrent service, so that a user can enjoy a high-speed data service provided by an LTE network, thereby improving user experience.

In order to implement the method shown in fig. 1, an embodiment of the present invention further provides a terminal, as shown in fig. 3, where the terminal includes: a first LTE module 31 and a first 2G/3G module 32; wherein,

the first LTE module 31 is configured to send a 2G/3G target frequency point and target cell information in an SRVCC command to the first 2G/3G module 32 after receiving the SRVCC command through a first radio frequency channel, and perform bearer-related processing on other data bearers except for a voice bearer according to a coverage condition of an LTE network;

and the first 2G/3G module 32 is configured to perform random access on the corresponding target cell through the second radio frequency channel after receiving the 2G/3G target frequency point and the target cell information sent by the first LTE module 31, and send an SRVCC handover complete command.

Wherein, the first LTE module 31 refers to: a module required for enabling the terminal to work under an LTE network;

accordingly, the first 2G/3G module 32 refers to: and the module is required for enabling the terminal to work under the 2G/3G network.

The terminal provided by the embodiment of the invention is a VoLTE dual standby terminal, namely, the terminal supports a CSFB mode and a 2G/3G mode, and the terminal is provided with an LTE module and a 2G module, or the terminal is provided with an LTE module and a 3G module. When the first 2G/3G module 32 is a 2G module, after receiving the SRVCC command through the first radio frequency channel, the first LTE module 31 sends the 2G target frequency point and the target cell information in the SRVCC command to the 2G module of the terminal; when the first 2G/3G module 32 is a 3G module, after receiving the SRVCC command through the first radio frequency channel, the first LTE module 31 sends the 3G target frequency point and the target cell information in the SRVCC command to the 3G module of the terminal.

The first LTE module 31 is further configured to analyze the SRVCC command, and correspondingly, send the analyzed 2G/3G target frequency point and target cell information to the first 2G/3G module 32, so that the first 2G/3G module 32 can identify the 2G/3G target frequency point and target cell information in the SRVCC command.

The first LTE module 31 is further configured to attach to an LTE network and occupy the first radio frequency channel when the terminal is in a coverage area of a VoLTE network;

correspondingly, the first 2G/3G module 32 is further configured to attach to a 2G/3G network and occupy a second channel when the terminal is in the coverage area of the VoLTE network.

The first LTE module 31 is further configured to report, when the terminal is powered on for attachment or performs TAU, the 2G, 3G, and 4G measurement capabilities and the dual radio frequency channel capability of the terminal to the first network side on the first radio frequency channel; correspondingly, the 2G/3G module 32 is further configured to report the 2G/3G single-mode measurement capability to the second network side on the second radio frequency channel when the terminal performs the power-on attachment or performs the TAU, so that the terminal can successfully complete the SRVCC.

The first network side is a network side corresponding to the LTE module, namely an LTE network side; the second network side is a network side corresponding to the 2G/3G module, namely a 2G/3G network side. Here, the network side refers to a network side device, such as a base station.

The first LTE module 31 is further configured to send a measurement result and a corresponding frequency point that satisfy a handover threshold to the first network side before receiving the SRVCC command through the first radio frequency channel, so that the first network side can send the SRVCC command carrying the 2G/3G target frequency point and the target cell information to the terminal; the measurement result meeting the switching threshold and the corresponding frequency point are obtained according to a 2G/3G adjacent cell frequency point list configured for the terminal by the first network side and the switching threshold; here, the time for the first network side to configure the 2G/3G neighbor frequency point list and the switching threshold for the terminal may be determined as needed, that is, the time for triggering the first network side to configure the 2G/3G neighbor frequency point list and the switching threshold for the terminal may be determined as needed.

The carrying related processing of other data bearers besides the voice bearer according to the coverage condition of the LTE network specifically includes:

the first LTE module 31 suspends the other data bearers, determines whether there is an LTE frequency point satisfying a residence condition, and recovers the other data bearers or works in an off-line state according to a determination result;

wherein the suspending the other data bearers means: no further data processing is performed.

Judging whether an LTE frequency point meeting the LTE residence condition exists, and recovering the other data bearing or working in the off-line state according to the judgment result, wherein the judging specifically comprises the following steps:

measuring the RSRP of the service frequency point attached to the first LTE module 31, and when it is determined that the service frequency point meets the LTE camping condition according to the measurement result, resuming the other data bearers that are suspended by the first LTE module 31; or,

measuring RSRP of self-attached service frequency points, searching the LTE frequency points attached to the first LTE module 31 within preset time when the service frequency points are determined not to meet the LTE residence condition according to the measurement result, and recovering the other hung data bearers after the random access process of the first LTE module 31 on the LTE frequency points meeting the LTE residence condition is completed when the LTE frequency points meeting the LTE residence condition are determined to exist in the attached LTE frequency points; or,

the method comprises the steps of measuring RSRP of self-attached service frequency points, searching the LTE frequency points attached to the first LTE module 31 within preset time when the service frequency points are determined not to meet LTE residence conditions according to measurement results, and working the first LTE module 31 in an off-line state when the LTE frequency points not meeting the LTE residence conditions are determined in the attached LTE frequency points.

The specific implementation of determining whether the serving frequency point meets the LTE camping condition according to the measurement result is a technical means commonly used by those skilled in the art, and details are not described here.

The specific implementation of determining whether there is an LTE frequency point satisfying the LTE camping condition in the attached LTE frequency points is a technical means commonly used by those skilled in the art, and is not described herein again.

The preset time can be set according to needs, such as: 2 hours, etc.

In actual application, the first LTE module 31 may resume the suspended other data bearers through a TAU procedure.

The performing random access on the corresponding target cell through the second radio frequency channel specifically includes:

the first 2G/3G module 32 frequency-modulates the second radio frequency channel to the target frequency point;

the first 2G/3G module 32 performs a random access procedure on the second radio frequency channel and the target cell.

The sending of the SRVCC handover complete command means: the first 2G/3G module 32 sends an SRVCC handover complete command to the second network side.

As can be seen from the above description, the terminal according to the embodiment of the present invention is a VoLTE dual standby terminal, and when the terminal is located at the edge of the coverage area of the VoLTE network or the edge of the coverage area of the CSFB network, the terminal can quickly recover a data service during SRVCC, so as to implement a concurrent service of data and voice, so that a user can enjoy a high-speed data service provided by the LTE network, thereby improving user experience.

In order to implement the method shown in fig. 2, an embodiment of the present invention further provides an implementation system of SRVCC, and as shown in fig. 4, the system includes: a first network side 41 and a terminal 42; the terminal 42 includes: a second LTE module 421 and a second 2G/3G module 422; wherein,

a first network side 41, configured to send an SRVCC command to a terminal 41;

the second LTE module 421 is configured to send the 2G/3G target frequency point and the target cell information in the SRVCC command to the second 2G/3G module 422 after receiving the SRVCC command from the first network side 41 through the first radio frequency channel, and perform bearer-related processing on other data bearers except for the voice bearer according to a coverage condition of the LTE network;

and the second 2G/3G module 422 is configured to perform random access on the corresponding target cell through the second radio frequency channel after receiving the 2G/3G target frequency point and the target cell information sent by the second LTE module 421, and send an SRVCC handover complete command.

Wherein the second LTE module 421 refers to: a module required for enabling the terminal to work under an LTE network;

accordingly, the second 2G/3G module 422 refers to: and the module is required for enabling the terminal to work under the 2G/3G network.

The terminal provided by the embodiment of the invention is a VoLTE dual standby terminal, namely, the terminal supports a CSFB mode and a 2G/3G mode, and the terminal is provided with an LTE module and a 2G module, or the terminal is provided with an LTE module and a 3G module. When the second 2G/3G module 422 is a 2G module, after receiving an SRVCC command from a first network side through a first radio frequency channel, the second LTE module 421 sends a 2G target frequency point and target cell information in the SRVCC command to the 2G module of the terminal; when the second 2G/3G module 422 is a 3G module, the second LTE module 421 receives an SRVCC command from a first network side through a first radio frequency channel, and then sends a 3G target frequency point and target cell information in the SRVCC command to the 3G module of the terminal.

The second LTE module 421 is further configured to parse the SRVCC command, and correspondingly, send the parsed 2G/3G target frequency point and target cell information to the second 2G/3G module 422, so that the second 2G/3G module 422 can identify the 2G/3G target frequency point and target cell information in the SRVCC command.

The second LTE module 421 is further configured to attach to an LTE network and occupy the first radio frequency channel when the terminal is in a coverage area of a VoLTE network; correspondingly, the second 2G/3G module 422 is further configured to attach to the 2G/3G network and occupy a second channel when the terminal is in the coverage area of the VoLTE network.

The system may further comprise: a second network side; wherein,

the second LTE module 421 is further configured to report, when the terminal 42 performs a power-on attachment or a TAU, the 2G, 3G, and 4G measurement capabilities and the dual radio frequency channel capability of the terminal to the first network side 41 on the first radio frequency channel; correspondingly, the second 2G/3G module 422 is further configured to report the 2G/3G single-mode measurement capability to the second network side on the second radio frequency channel when the terminal 42 performs the power-on attachment or the TAU, and when the terminal 42 performs the power-on attachment or the TAU, so that the terminal can successfully complete the SRVCC.

The first network side 41 is a network side corresponding to the second LTE module 421, that is, an LTE network side; the second network side is a network side corresponding to the second 2G/3G module 422, that is, a 2G/3G network side. Here, the network side refers to a network side device, such as a base station.

The first network side 41 is further configured to configure a 2G/3G neighbor frequency point list and a switching threshold for the terminal; receiving the measurement result and the corresponding frequency point sent by the second LTE module 421;

the second LTE module 421 is further configured to send a measurement result and a corresponding frequency point that satisfy a handover threshold to the first network side 41, so that the first network side 41 can send an SRVCC command carrying a 2G/3G target frequency point and target cell information to the terminal 42; the time for configuring the 2G/3G neighboring frequency point list and the switching threshold for the terminal by the first network side 41 may be determined as needed, that is, the time for triggering the first network side 41 to configure the 2G/3G neighboring frequency point list and the switching threshold for the terminal 42 may be determined as needed.

The measurement result and the corresponding frequency point that satisfy the switching threshold are obtained according to the 2G/3G neighboring frequency point list configured by the first network side 41 for the terminal 42 and the switching threshold.

The carrying related processing of other data bearers besides the voice bearer according to the coverage condition of the LTE network specifically includes:

the second LTE module 421 suspends the other data bearers, determines whether there is an LTE frequency point that meets the residence condition, and recovers the other data bearers or works in an off-line state according to the determination result;

wherein the suspending the other data bearers means: no further data processing is performed.

Judging whether an LTE frequency point meeting the LTE residence condition exists, and recovering the other data bearing or working in the off-line state according to the judgment result, wherein the judging specifically comprises the following steps:

measuring the RSRP of the service frequency point attached to the second LTE module 421, and when it is determined that the service frequency point meets the LTE camping condition according to the measurement result, resuming the other data bearers that are suspended; or,

measuring RSRP of the service frequency points attached to the second LTE module 421, searching the LTE frequency points attached to the second LTE module 421 within a preset time when the service frequency points are determined not to satisfy the LTE residence condition according to the measurement result, and recovering the other data bearers which are hung after the random access process is completed on the LTE frequency points satisfying the LTE residence condition by the second LTE module 421 when the LTE frequency points satisfying the LTE residence condition are determined to exist in the attached LTE frequency points; or,

the RSRP of the service frequency points attached to the second LTE module 421 is measured, and when it is determined according to the measurement result that the service frequency points do not satisfy the LTE retention condition, the LTE frequency points attached to the second LTE module 421 are searched within a preset time, and when it is determined that no LTE frequency point satisfying the LTE retention condition is included in the attached LTE frequency points, the second LTE module 421 operates in an off-line state.

The specific implementation of determining whether the serving frequency point meets the LTE camping condition according to the measurement result is a technical means commonly used by those skilled in the art, and details are not described here.

The specific implementation of determining whether there is an LTE frequency point satisfying the LTE camping condition in the attached LTE frequency points is a technical means commonly used by those skilled in the art, and is not described herein again.

The preset time can be set according to needs, such as: 2 hours, etc.

In practice, the second LTE module 421 may resume the suspended other data bearers through TAU procedures.

The performing random access on the corresponding target cell through the second radio frequency channel specifically includes:

the second 2G/3G module 422 modulates the frequency of the second radio frequency channel to the target frequency point;

the second 2G/3G module 422 performs a random access procedure with the target cell on the second radio frequency channel.

The sending of the SRVCC handover complete command means: the second 2G/3G module 422 sends an SRVCC handover complete command to the second network side.

As can be seen from the above description, the terminal according to the embodiment of the present invention is a VoLTE dual standby terminal, and when the terminal is located at the edge of the coverage area of the VoLTE network or the edge of the coverage area of the CSFB network, the terminal can quickly recover a data service during SRVCC, so as to implement a concurrent service of data and voice, so that a user can enjoy a high-speed data service provided by the LTE network, thereby improving user experience.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.

Claims (30)

1. A method for implementing single radio mode voice call continuity (SRVCC), the method comprising:

after receiving an SRVCC command through a first radio frequency channel, an LTE module of a terminal sends a 2G/3G target frequency point and target cell information in the SRVCC command to the 2G/3G module of the terminal, and carries out bearing related processing on other data bearers except voice bearers according to the coverage condition of an LTE network;

the 2G/3G module performs random access on a corresponding target cell through a second radio frequency channel and sends an SRVCC switching completion command;

wherein, the carrying related processing of other data carrying except the voice carrying according to the coverage condition of the LTE network comprises:

and the LTE module suspends the other data bearers, judges whether an LTE frequency point meeting the residence condition exists or not, and recovers the other data bearers or works in an off-line state according to the judgment result.

2. The method of claim 1, wherein before the sending the 2G/3G target frequency point and the target cell information in the SRVCC command to a 2G/3G module of a terminal, the method further comprises:

the LTE module analyzes the SRVCC command;

correspondingly, the LTE module sends the analyzed 2G/3G target frequency point and the target cell information to the 2G/3G module.

3. The method of claim 1, further comprising:

when the terminal is in power-on attachment or tracking area update TAU, the LTE module reports 2G, 3G and 4G measurement capability and dual radio frequency channel capability of the terminal to a first network side on the first radio frequency channel, and the 2G/3G module reports 2G/3G single-mode measurement capability to a second network side on the second radio frequency channel.

4. The method of claim 3, wherein before the terminal's LTE module receives the SRVCC command over the first radio frequency channel, the method further comprises:

the LTE module sends a measurement result meeting a switching threshold and a corresponding frequency point to the first network side; wherein,

the measurement result meeting the switching threshold and the corresponding frequency points are as follows: and obtaining a measurement result meeting a switching threshold and a corresponding frequency point according to a 2G/3G adjacent cell frequency point list configured for the terminal by the first network side and the switching threshold.

5. The method of claim 3, further comprising:

when the terminal is in a coverage area of a VoLTE network, the LTE module is attached to the LTE network and occupies the first radio frequency channel; the 2G/3G module is attached to the 2G/3G network and occupies a second channel.

6. The method of claim 1, wherein the determining whether there is an LTE frequency point satisfying an LTE camping condition, and recovering the other data bearers or operating in an off-line state according to a determination result comprises:

and measuring Reference Signal Received Power (RSRP) of the self-attached service frequency point, and when the service frequency point is determined to meet the LTE resident condition according to the measurement result, the LTE module recovers the other suspended data bearers.

7. The method of claim 1, wherein the determining whether there is an LTE frequency point satisfying an LTE camping condition, and recovering the other data bearers or operating in an off-line state according to a determination result comprises:

the method comprises the steps of measuring RSRP of service frequency points attached to the LTE module, searching the LTE frequency points attached to the LTE module within preset time when the service frequency points do not meet LTE residence conditions according to measurement results, and recovering other hung data bearers after the LTE module completes a random access process on the LTE frequency points meeting the LTE residence conditions when the LTE frequency points meeting the LTE residence conditions are determined to exist in the attached LTE frequency points.

8. The method of claim 1, wherein the determining whether there is an LTE frequency point satisfying an LTE camping condition, and recovering the other data bearers or operating in an off-line state according to a determination result comprises:

the method comprises the steps of measuring RSRP of service frequency points attached to the LTE module, searching the LTE frequency points attached to the LTE module within preset time when the service frequency points do not meet LTE residence conditions according to measurement results, and working the LTE module in an off-line state when the LTE frequency points which do not meet the LTE residence conditions are determined in the attached LTE frequency points.

9. The method according to any of claims 6 to 8, wherein the LTE module resumes the other data bearers that are suspended by a tracking area update TAU procedure.

10. The method according to any one of claims 1 to 8, wherein the 2G/3G module performs random access on the corresponding target cell through a second radio frequency channel, and comprises:

the 2G/3G module modulates the frequency of the second radio frequency channel to the target frequency point;

and the 2G/3G module performs a random access process on the second radio frequency channel and the target cell.

11. A method for implementing SRVCC, the method comprises:

after receiving an SRVCC command from a first network side through a first radio frequency channel, an LTE module of the terminal sends a 2G/3G target frequency point and target cell information in the SRVCC command to the 2G/3G module of the terminal, and carries out bearing related processing on other data bearings except voice bearings according to the coverage condition of the LTE network;

the 2G/3G module performs random access on a corresponding target cell through a second radio frequency channel and sends an SRVCC switching completion command;

wherein, the carrying related processing of other data carrying except the voice carrying according to the coverage condition of the LTE network comprises:

and suspending the other data bearers, judging whether the LTE frequency points meeting the residence conditions exist, and recovering the other data bearers or working in an off-line state according to the judgment result.

12. The method of claim 11, wherein before the sending the 2G/3G target frequency point and the target cell information in the SRVCC command to the 2G/3G module of the terminal, the method further comprises:

the LTE module analyzes the SRVCC command;

correspondingly, the LTE module sends the analyzed 2G/3G target frequency point and the target cell information to the 2G/3G module.

13. The method of claim 11, further comprising:

when the terminal is in power-on attachment or tracking area update TAU, the LTE module reports 2G, 3G and 4G measurement capability and dual radio frequency channel capability of the terminal to the first network side on the first radio frequency channel, and the 2G/3G module reports 2G/3G single-mode measurement capability to the second network side on the second radio frequency channel.

14. The method of claim 11, further comprising:

the first network side configures a 2G/3G adjacent cell frequency point list and a switching threshold for the terminal;

the LTE module sends a measurement result meeting a switching threshold and a corresponding frequency point to the first network side; wherein,

the measurement result meeting the switching threshold and the corresponding frequency points are as follows: and obtaining a measurement result meeting a switching threshold and a corresponding frequency point according to a 2G/3G adjacent cell frequency point list configured for the terminal by the first network side and the switching threshold.

15. The method of claim 13, further comprising:

when the terminal is in a coverage area of a VoLTE network, the LTE module is attached to the LTE network and occupies the first radio frequency channel; the 2G/3G module is attached to the 2G/3G network and occupies a second channel.

16. The method of claim 11, wherein the determining whether there is an LTE frequency point satisfying an LTE camping condition, and recovering the other data bearers or operating in an off-line state according to a determination result includes:

and measuring the RSRP of the self-attached service frequency point, and when the service frequency point is determined to meet the LTE resident condition according to the measurement result, the LTE module recovers the other suspended data bearers.

17. The method of claim 11, wherein the determining whether there is an LTE frequency point satisfying an LTE camping condition, and recovering the other data bearers or operating in an off-line state according to a determination result includes:

the method comprises the steps of measuring RSRP of service frequency points attached to the LTE module, searching the LTE frequency points attached to the LTE module within preset time when the service frequency points do not meet LTE residence conditions according to measurement results, and recovering other hung data bearers after the LTE module completes a random access process on the LTE frequency points meeting the LTE residence conditions when the LTE frequency points meeting the LTE residence conditions are determined to exist in the attached LTE frequency points.

18. The method of claim 11, wherein the determining whether there is an LTE frequency point satisfying an LTE camping condition, and recovering the other data bearers or operating in an off-line state according to a determination result includes:

the method comprises the steps of measuring RSRP of service frequency points attached to the LTE module, searching the LTE frequency points attached to the LTE module within preset time when the service frequency points do not meet LTE residence conditions according to measurement results, and working the LTE module in an off-line state when the LTE frequency points which do not meet the LTE residence conditions are determined in the attached LTE frequency points.

19. The method according to any of claims 16 to 18, wherein the LTE module resumes the other data bearers that are suspended by a TAU procedure.

20. The method according to any of claims 11 to 18, wherein the 2G/3G module performs random access on the corresponding target cell through a second radio frequency channel, and comprises:

the 2G/3G module modulates the frequency of the second radio frequency channel to the target frequency point;

and the 2G/3G module performs a random access process on the second radio frequency channel and the target cell.

21. A terminal, characterized in that the terminal comprises: a first LTE module and a first 2G/3G module; wherein,

the first LTE module is used for sending the 2G/3G target frequency point and the target cell information in the SRVCC command to the first 2G/3G module after receiving the SRVCC command through a first radio frequency channel, and carrying out carrying related processing on other data bearers except voice bearer according to the coverage condition of the LTE network;

the first 2G/3G module is used for receiving the 2G/3G target frequency point and the target cell information sent by the first LTE module, performing random access on the corresponding target cell through a second radio frequency channel, and sending an SRVCC switching completion command;

the first LTE module performs bearer-related processing on other data bearers except for the voice bearer according to a coverage condition of the LTE network, including:

and the first LTE module suspends the other data bearers, judges whether an LTE frequency point meeting a residence condition exists or not, and recovers the other data bearers or works in an off-line state according to a judgment result.

22. The terminal of claim 21,

the first LTE module is further configured to analyze the SRVCC command, and correspondingly, send the analyzed 2G/3G target frequency point and target cell information to the first 2G/3G module.

23. The terminal of claim 22, wherein the first LTE module is further configured to report, when the terminal performs power on attachment or performs TAU, 2G, 3G, and 4G measurement capabilities and dual radio channel capabilities of the terminal to a first network side on the first radio channel;

correspondingly, the 2G/3G module is further configured to report the 2G/3G single-mode measurement capability to a second network side on the second radio frequency channel when the terminal performs power-on attachment or performs TAU.

24. The terminal of claim 23, wherein the first LTE module is further configured to send a measurement result meeting a handover threshold and a corresponding frequency point to the first network side before receiving an SRVCC command through a first radio frequency channel; wherein,

the measurement result meeting the switching threshold and the corresponding frequency points are as follows: and obtaining a measurement result meeting a switching threshold and a corresponding frequency point according to a 2G/3G adjacent cell frequency point list configured for the terminal by the first network side and the switching threshold.

25. The terminal according to any of the claims 21 to 24,

the first LTE module is further used for attaching to an LTE network and occupying the first radio frequency channel when the terminal is in a coverage area of the VoLTE network;

correspondingly, the first 2G/3G module is also used for attaching to the 2G/3G network and occupying a second channel when the terminal is in the coverage area of the VoLTE network.

26. An implementation system of SRVCC, the system comprising: a first network side and a terminal; the terminal includes: a second LTE module and a second 2G/3G module; wherein,

the first network side is used for sending an SRVCC command to the terminal;

the second LTE module is used for sending the 2G/3G target frequency point and the target cell information in the SRVCC command to the second 2G/3G module after receiving the SRVCC command from the first network side through the first radio frequency channel, and carrying out bearing related processing on other data bearings except voice bearing according to the coverage condition of the LTE network;

the second 2G/3G module is configured to perform random access on a corresponding target cell through a second radio frequency channel after receiving the 2G/3G target frequency point and the target cell information sent by the second LTE module, and send an SRVCC handover completion command;

the second LTE module performs bearer-related processing on other data bearers except for the voice bearer according to the coverage of the LTE network, including:

and the second LTE module suspends the other data bearers, judges whether an LTE frequency point meeting the residence condition exists or not, and recovers the other data bearers or works in an off-line state according to the judgment result.

27. The system of claim 26, wherein the second LTE module is further configured to parse the SRVCC command, and accordingly send the parsed 2G/3G target frequency point and target cell information to the second 2G/3G module.

28. The system of claim 26, further comprising: a second network side; wherein,

the second LTE module is further configured to report, to the first network side, 2G, 3G, and 4G measurement capabilities and dual radio frequency channel capabilities of the terminal on the first radio frequency channel when the terminal is powered on for attachment or performs TAU;

correspondingly, the second 2G/3G module is further configured to report the 2G/3G single-mode measurement capability to the second network side on the second radio frequency channel when the terminal performs the power-on attachment or the TAU and when the terminal performs the power-on attachment or the TAU.

29. The system of claim 28,

the first network side is further configured to configure a 2G/3G neighbor frequency point list and a switching threshold for the terminal; receiving the measurement result and the corresponding frequency point sent by the second LTE module;

the second LTE module is further configured to send a measurement result meeting a handover threshold and a corresponding frequency point to the first network side; wherein,

the measurement result meeting the switching threshold and the corresponding frequency points are as follows: and obtaining a measurement result meeting a switching threshold and a corresponding frequency point according to a 2G/3G adjacent cell frequency point list configured for the terminal by the first network side and the switching threshold.

30. The system of any one of claims 26 to 29,

the second LTE module is further used for attaching to an LTE network and occupying the first radio frequency channel when the terminal is in a coverage area of the VoLTE network;

correspondingly, the second 2G/3G module is also used for attaching to the 2G/3G network and occupying a second channel when the terminal is in the coverage area of the VoLTE network.