WO2020102954A1

WO2020102954A1 - Method, apparatus and system for single radio voice call continuity (srvcc) of terminal

Info

Publication number: WO2020102954A1
Application number: PCT/CN2018/116278
Authority: WO
Inventors: 卢哲军; 刘珺
Original assignee: 华为技术有限公司
Priority date: 2018-11-19
Filing date: 2018-11-19
Publication date: 2020-05-28
Also published as: CN111713137A; CN111713137B

Abstract

Disclosed is a method for a mobile originated service of a terminal. The method comprises: setting a service identifier TI of a mobile originated service of a terminal, wherein the service identifier TI of the mobile originated service comprises a TI flag bit; receiving a downlink message of the mobile originated service, wherein the downlink message also comprises the TI flag bit of the mobile originated service; and when a value of the TI flag bit indicated by the downlink message is inconsistent with a value of the set TI flag bit of the terminal, enabling the terminal to perform the mobile originated service according to the value of the TI flag bit indicated by the downlink message. By using the technical solution, the continuity of the mobile originated service of the terminal can be guaranteed, and quality of service assurance can be provided for a user.

Description

Method, device and system for single wireless voice call continuity SRVCC for terminal

Technical field

The present application relates to the field of communications, and in particular to a method, device, and system for a single wireless voice call continuity SRVCC for a terminal.

Background technique

With the development of communication technology, the Long Term Evaluation (LTE) network in the 4th generation (4G) communication system introduces LTE voice over LTE (VoLTE), and uses packet switching (packet The switched (PS) domain carries call services, and provides service quality assurance through the Internet Protocol Multimedia Subsystem (IMS). Since VoLTE has not yet been fully deployed, when the terminal that is performing mobile calling service (mobile originating service) is gradually moved out of the network covered by the VoLTE hotspot and gradually enters the coverage of the 2G or 3G network, it crosses two different May be interrupted by the mobile calling service.

In order to solve the above problems and ensure the continuity of voice switching, a single wireless voice call continuity (SRVCC) solution is introduced to switch the voice service carried in the PS domain on the LTE side to the universal mobile communication system terrestrial wireless Access network (universal mobile telecommunications system terrestrial radio access network, UTRAN) or mobile communication global system / enhanced data rate GERAN) is carried in the circuit switched (CS) domain.

How to ensure the continuity of the mobile calling service of the terminal before the handover during the above handover process or after the handover is an important issue worth studying.

Summary of the invention

Embodiments of the present application provide a method, device, and system for a single wireless voice call continuity SRVCC of a terminal, which are used to ensure the voice service continuity of the mobile calling service of the terminal.

It should be understood that the method in the embodiments of the present application may be executed by a communication device, and the communication device may be a terminal or a chip that may be provided in the terminal. The chip may specifically be a baseband processor or a system on chip (SoC).

In a first aspect, a method for single wireless voice call continuity SRVCC for a terminal is provided. The method includes:

Set the service identifier TI of the mobile calling service of the terminal, and the service identifier TI of the mobile calling service includes the TI flag; receive the downlink message of the mobile calling service, and the downlink message also includes the TI of the mobile calling service Flag bit; when the value of the TI flag bit indicated by the downlink message is inconsistent with the value of the TI flag bit set by the terminal, the terminal is enabled to perform the mobile calling service according to the value of the TI flag bit indicated by the downlink message.

It should be understood that setting the service identifier TI of the mobile calling service of the terminal may include setting the value of the TI flag bit in the service flag TI, and the value of the set TI flag bit is used to represent the mobile calling service. Or, it may include setting the value of the TI flag bit in the service flag TI, where the value of the set TI flag bit is used to represent the mobile called service. Further, it may also include setting the value of the TI flag of the upstream message of the mobile calling service, and / or the value of the TI flag of the downstream message of the mobile calling service.

It should be understood that enabling the terminal to perform the mobile calling service according to the value of the TI flag indicated by the downlink message, optionally, includes the terminal receiving the mobile calling service according to the value of the TI flag indicated by the downlink message Downlink message; optional, including the terminal sending the uplink message of the mobile calling service according to the value of the TI flag bit indicated by the downlink message; optional, including the terminal flag according to the TI flag bit indicated by the downlink message Value to receive downlink messages for the mobile calling service and send uplink messages for the mobile calling service.

It should be understood that with this technical solution, it is determined whether the method for setting the service identifier TI of the mobile calling service on the terminal side and the network side is consistent by receiving a downlink message corresponding to the mobile calling service, and when the setting method is inconsistent, the The method of setting the mobile calling service corresponding to the TI on the terminal side adapts to the network side to ensure the continuity of the mobile calling service of the terminal.

With reference to the technical solution provided in the first aspect above, in an optional implementation manner, the service identifier TI of the mobile calling service further includes a TI value, the set TI value of the mobile calling service of the terminal and the The TI value of the mobile calling service in the downlink message is the same, and the TI value of the mobile calling service is "000".

It should be understood that setting the service identifier TI of the mobile calling service of the terminal may include setting the TI value in the service identifier TI, and the set TI value is "000". It should be understood that the TI value of the mobile calling service can also be expanded to other values, such as "0000000".

With reference to the technical solution provided in the first aspect or the optional embodiment described above, in an optional embodiment, an uplink message of the mobile calling service is sent, and the value of the TI flag bit of the uplink message is used to indicate that the mobile is Calling service; wherein, the value of the set TI flag of the mobile calling service of the terminal is used to indicate a mobile calling service, and the value of the TI flag of the downlink message is used to indicate a mobile called service.

On this basis, in an optional embodiment, the value of the TI flag of the upstream message is "1", the value of the TI flag of the downstream message is "0", the set The value of the TI flag of the upstream message of the mobile calling service is "0", and the value of the TI flag of the set downstream message of the mobile calling service of the terminal is "1".

It should be understood that receiving the downlink message of the mobile calling service according to the value of the TI flag bit indicated by the downlink message can be understood as receiving a downlink message with a TI flag bit of "0" and a TI value of "000". Sending the downlink message of the mobile calling service according to the value of the TI flag bit indicated by the downlink message can be understood as sending an uplink message with a TI flag bit of "1" and a TI value of "000".

With reference to the technical solution provided in the first aspect or the optional embodiment described above, in an optional embodiment, an uplink message of the mobile calling service is sent, and the value of the TI flag of the uplink message is used to indicate the mobile Calling service; wherein, the value of the set TI flag of the mobile calling service of the terminal is used to indicate a mobile called service, and the value of the TI flag of the downlink message is used to indicate a mobile calling service.

On this basis, in an optional embodiment, the value of the TI flag of the upstream message is "0", the value of the TI flag of the downstream message is "1", the setting of the terminal The value of the TI flag of the upstream message of the mobile calling service is "1", and the value of the TI flag of the set downstream message of the mobile calling service of the terminal is "0".

It should be understood that receiving the downlink message of the mobile calling service according to the value of the TI flag bit indicated by the downlink message can be understood as receiving a downlink message with a TI flag bit of "1" and a TI value of "000". Sending the downlink message of the mobile calling service according to the value of the TI flag bit indicated by the downlink message can be understood as sending an uplink message with a TI flag bit of "0" and a TI value of "000".

With reference to the technical solution provided in the first aspect or the optional implementation manner described above, in an optional implementation manner, other downlink messages of the mobile calling service are received according to the value of the TI flag bit indicated by the downlink message.

It should be understood that receiving other downlink messages of the mobile calling service according to the value of the TI flag bit indicated by the downlink message can be understood as indicating whether the value of the TI flag bit indicated by the downlink message is used to indicate whether the mobile calling service or the mobile Call service to receive other downlink messages for the mobile calling service. When the value of the TI flag bit indicated by the downlink message is used to indicate the mobile calling service, the value of the received TI flag bit is used to indicate other downlink messages of the mobile calling service. When the value of the TI flag bit indicated by the downlink message is used to indicate the mobile called service, the value of the received TI flag bit is used to indicate other downlink messages of the mobile called service.

Or, it can also be understood that other downlink messages of the mobile calling service are received according to the size of the TI flag bit indicated by the downlink message. For example, when the value of the TI flag bit indicated by the downlink message is "0", another downlink message with the value of the TI flag bit "0" is received. When the value of the TI flag bit indicated by the downlink message is "1", other downlink messages with the value of the TI flag bit "1" are received. The TI value of other downlink messages is the same as the TI value of the downlink message.

With reference to the technical solutions provided in the foregoing optional embodiments, in an optional embodiment, the uplink message of the mobile calling service is a connection response message.

With reference to the technical solution provided in the first aspect or any one of the optional implementation manners in the first aspect, in an optional implementation manner, the downlink message of the mobile calling service is a call proceeding message. In another optional embodiment, the downlink message of the mobile calling service is a ringing message. In yet another optional embodiment, the downlink message of the mobile calling service is a connection message. It should be understood that the downlink message of the mobile calling service may be a radio frequency signal of any one of the above messages, or a baseband signal of any one of the above messages, or a signal in software code.

In a second aspect, a method for a single wireless voice call continuity SRVCC for a terminal is provided. The method includes:

Sending the first uplink message of the mobile calling service of the terminal, the first uplink message including the service identification TI flag of the mobile calling service; receiving the first downlink message of the mobile calling service; under the first When the mobile terminal instructs the terminal to release resources, it sends a second uplink message for the mobile calling service of the terminal. The value of the service identifier TI flag in the first uplink message and the service identifier TI flag in the second uplink message Value is different.

It should be understood that the first uplink message and the second uplink message may be the same signaling or different signaling.

It should be understood that with this technical solution, by determining whether the method for setting the service identifier TI of the mobile calling service by the terminal side and the network side is consistent, and when the setting methods are inconsistent, the terminal side can adapt to the network side to set the mobile calling party The service corresponds to the TI method to ensure the continuity of the mobile calling service of the terminal.

With reference to the technical solution provided in the second aspect above, in an optional implementation manner, the second downlink message of the mobile calling service is received according to the value of the service identifier TI flag in the second uplink message.

It should be understood that receiving the second downlink message of the mobile calling service according to the value of the service identifier TI flag in the second uplink message can be understood as using the value of the service identifier TI flag in the second uplink message Yu indicates whether the mobile calling service or the mobile called service receives the second downlink message of the mobile calling service. When the value of the service identifier TI flag in the second uplink message is used to indicate the mobile calling service, the value of the received TI flag is used to indicate the second downlink message of the mobile calling service. When the value of the TI flag in the second uplink message is used to indicate the mobile called service, the value of the received TI flag is used to indicate the second downlink message of the mobile called service.

Alternatively, it can also be understood that the second downlink message of the mobile calling service is received according to the value of the service identifier TI flag in the second uplink message. For example, when the value of the TI flag of the service identifier in the second uplink message is "0", other downlink messages with the value of the TI flag of "1" are received. When the value of the TI flag of the service identifier in the second uplink message is "0", other downlink messages with the value of the TI flag of "1" are received. The TI value of other downlink messages is the same as the TI value of the downlink message.

With reference to the technical solution provided in the second aspect or any optional implementation manner in the second aspect, in an optional implementation manner, the value of the service identifier TI flag bit in the first uplink message is used to indicate mobility For the calling service, the value of the TI flag in the second uplink message is used to indicate the mobile called service.

On this basis, in an optional embodiment, the value of the TI flag of the service identifier in the first uplink message is "0", and the value of the TI flag of the service identifier in the second uplink message is " 1".

In another optional implementation manner, the value of the service identifier TI flag in the first uplink message is used to indicate a mobile called service, and the value of the service identifier TI flag in the second uplink message is used to indicate Mobile calling service.

On this basis, in an optional embodiment, the value of the service flag TI flag in the first uplink message is "1", and the value of the service flag TI flag in the second uplink message is " 0 ".

With reference to the technical solution provided in the second aspect or any optional implementation manner in the second aspect, in an optional implementation manner, the first uplink message includes a service identification TI value of the mobile calling service, the The second uplink message includes the service identifier TI value of the mobile calling service, and the service identifier TI value of the mobile calling service is "000".

With reference to the technical solutions provided in the second aspect or any optional implementation manner in the second aspect, in an optional implementation manner, the first uplink message and the second uplink message are status query messages. In another optional implementation manner, the first uplink message is a status query message, and the second uplink message is a connection response message.

With reference to the technical solution provided in the second aspect or any optional implementation manner in the second aspect, in an optional implementation manner, the first downlink message is a release message.

With reference to the technical solution provided in the second aspect or any optional implementation manner in the second aspect, in an optional implementation manner, the second downlink message is a session processing message. In another optional implementation manner, the second downlink message is a ringing message. In yet another optional embodiment, the second downlink message is a connection message.

In a third aspect, a single wireless voice call continuity SRVCC device for a terminal is provided. The device includes:

The setting unit is used to set the service identification TI of the mobile calling service of the terminal, and the service identification TI of the mobile calling service includes a TI flag; the receiving unit is used to receive a downlink message of the mobile calling service, the downlink message The TI flag of the mobile calling service is also included; the processing unit is configured to enable the terminal to respond to the downlink according to the downlink when the value of the TI flag indicated by the downlink message is inconsistent with the value of the TI flag set by the terminal The value of the TI flag bit indicated by the message carries out the mobile calling service.

It should be understood that the above setting unit, receiving unit and processing unit may be implemented by corresponding codes in a software algorithm, may also be implemented by hardware, or may be implemented by a combination of software algorithm and hardware.

It should be understood that with this technical solution, the downlink message corresponding to the mobile calling service can be received to determine whether the terminal side and the network side adopt the same setting method for the TI corresponding to the mobile calling service, and adapt to the terminal side The network side adopts a setting method corresponding to TI for the mobile calling service to enable the mobile calling service of the terminal to remain continuous.

With reference to the technical solution provided in the third aspect above, in an optional implementation manner, the service identifier TI of the mobile calling service further includes a TI value, the set TI value of the mobile calling service of the terminal and the The TI value of the mobile calling service included in the downlink message is the same, and the TI value of the mobile calling service is "000".

With reference to the technical solution provided in the third aspect or any optional implementation manner in the third aspect, in an optional implementation manner, the apparatus further includes: a sending unit, configured to send the uplink of the mobile calling service Message, the TI flag in the uplink message is "0"; where the TI flag of the mobile calling service of the terminal is set to "1", and the TI flag of the mobile calling service in the downlink message The bit is "0". In another optional embodiment, the apparatus further includes: a sending unit, configured to send an uplink message of the mobile calling service, the TI flag in the uplink message is "1"; wherein, the set The TI flag of the mobile calling service of the terminal is "0", and the TI flag of the mobile calling service in the downlink message is "1".

With reference to the technical solution provided in any of the optional embodiments in the third aspect above, in an optional embodiment, the uplink message of the mobile calling service is a connection response message.

With reference to the technical solution provided in any of the optional embodiments in the third aspect above, in an optional embodiment, the downlink message is a connection message. In another optional implementation manner, the downlink message is a call proceeding message. In yet another optional embodiment, the downlink message is a ringing message.

In a fourth aspect, there is provided a single wireless voice call continuity SRVCC device for a terminal. The device includes:

The sending unit is used to send the first uplink message of the mobile calling service of the terminal, the first uplink message includes the service identification TI flag of the mobile calling service; the receiving unit is used to receive the downlink of the mobile calling service Message; the sending unit is also used to send a second uplink message of the mobile calling service of the terminal when the first downlink message instructs the terminal to release resources, and the value of the TI flag of the service identifier of the first uplink message The value of the TI flag of the service identifier of the second uplink message is different.

With reference to the technical solution provided in the fourth aspect above, in an optional implementation manner, the receiving unit is further configured to receive the first mobile calling service according to the value of the service identifier TI flag of the second uplink message. Second downlink news.

With reference to the technical solution provided in the fourth aspect or any optional implementation manner in the fourth aspect, in an optional implementation manner, the value of the service identifier TI flag of the first uplink message is used to indicate the mobile master Is called a service, and the value of the TI flag of the service identifier of the second uplink message is used to indicate a mobile called service. On this basis, in an optional implementation manner, the value of the service flag TI flag of the first uplink message is "0", and the value of the service flag TI flag of the second uplink message is "1".

In another optional implementation manner, the value of the service identifier TI flag of the first uplink message is used to indicate mobile called services, and the value of the service identifier TI flag of the second uplink message is used to indicate the mobile master Called business. On this basis, in an optional implementation manner, the value of the service identifier TI flag of the first uplink message is "1", and the value of the service identifier TI flag of the second uplink message is "0".

With reference to the technical solution provided in the fourth aspect or any optional implementation manner in the fourth aspect, in an optional implementation manner, the first uplink message includes a service identification TI value of the mobile calling service, the The second uplink message includes the service identifier TI value of the mobile calling service, and the service identifier TI value of the mobile calling service is "000".

With reference to the technical solutions provided in the fourth aspect or any optional implementation manner in the fourth aspect, in an optional implementation manner, the first uplink message and the second uplink message are status query messages. In another optional implementation manner, the first uplink message is a status query message, and the second uplink message is a connection response message.

With reference to the technical solutions provided in the fourth aspect or any optional implementation manner in the fourth aspect, in an optional implementation manner, the first downlink message is a release message.

With reference to the technical solutions provided in the fourth aspect or any optional implementation manner in the fourth aspect, in an optional implementation manner, the second downlink message is a session processing message. In another optional implementation manner, the second downlink message is a ringing message. In yet another optional embodiment, the second downlink message is a connection message.

In a fifth aspect, a device for single terminal wireless voice call continuity SRVCC of a terminal is provided. The apparatus includes: a processor and a memory, wherein the processor is used to execute instructions in the memory, so that the terminal executes the instructions in the memory, to implement any one or any of the first to fourth aspects Technical solutions provided by an optional implementation.

In a sixth aspect, an apparatus for a mobile calling service of a terminal is provided. The device includes: a processor and an interface circuit, wherein the processor is coupled to the memory through the interface circuit, and the processor is used to execute the program code in the memory to implement any one of the first aspect to the fourth aspect or A technical solution provided by any optional implementation manner.

According to a seventh aspect, a computer-readable storage medium is provided, in which a program code is stored, and when the program code is executed by a processor in a terminal, any of the first to fourth aspects is realized. A technical solution provided by one aspect or any optional implementation manner.

According to an eighth aspect, a computer program product is provided. When the program code contained in the computer program product is executed by a processor in a terminal, any one of the first aspect to the fourth aspect or any optional The technical solution provided by the implementation method.

According to a ninth aspect, a terminal is provided, including: a baseband processor and a transceiver circuit, wherein the baseband processor is used to set a service identification TI of the mobile calling service of the terminal, and a service identification TI of the mobile calling service Including the TI flag; the transceiver circuit is used to receive the downlink message of the mobile calling service, and the downlink message also includes the TI flag of the mobile calling service; the baseband processor is also used to indicate in the downlink message When the value of the TI flag bit is inconsistent with the value of the TI flag bit set by the terminal, the terminal is enabled to perform the mobile calling service according to the value of the TI flag bit indicated by the downlink message.

It should be understood that the transceiver circuit may be an interface circuit of a baseband processor (such as a chip pin), or may be an antenna module of the terminal, and / or a radio frequency subsystem.

According to a tenth aspect, a terminal is provided, including: a baseband processor and a transceiver circuit, wherein the transceiver circuit is used to send a first uplink message of a mobile calling service of the terminal, and the first uplink message includes the mobile calling party The TI flag of the service identifier of the service; the transceiver circuit is also used to receive the downlink message of the mobile calling service; the baseband processor is used to determine whether the first downlink message instructs the terminal to release resources in the first downlink When the message indicates that the terminal releases resources, the transceiver circuit is configured to send a second uplink message of the mobile calling service of the terminal, the value of the service identifier TI flag of the first uplink message and the service identifier TI flag of the second uplink message The value of the bit is different.

In an eleventh aspect, a wireless communication system is provided, including a wireless network device, and a terminal provided in any one of the third aspect to the fourth aspect or any optional implementation manner, or, as in the ninth aspect to the tenth aspect A terminal provided in any aspect or any optional implementation manner.

According to a twelfth aspect, a method for single wireless voice call continuity SRVCC call activation is provided, characterized in that the terminal has a single voice media stream switched from the data exchange domain to the circuit switched domain through the SRVCC, the method includes : The single voice media stream is related to the mobile active session before the SRVCC; set the service identifier of the call to "000", the service identifier of the upstream message of the call is "1", and the service identifier of the downstream message of the call The flag is "0"; the downlink message with the service identifier value "000" is received, the service identifier flag of the downlink message is "1", the first uplink message of the call is sent, and the service identifier flag of the first uplink message is "0".

In a thirteenth aspect, a method for SRVCC call activation is provided, characterized in that the terminal has a single voice media stream switched from the data exchange domain to the circuit switched domain through the SRVCC. The method includes: the single voice media stream and The mobile active session before SRVCC is related; set the service identifier of the call to "000", the service identifier of the upstream message of the call is "0", and the service identifier of the downstream message of the call is "1"; receive The downlink message with the service identifier value being "000", the service identifier marker of the downlink message is "0", the first uplink message of the call is sent, and the service identifier marker of the first uplink message is "1".

It should be understood that with the above technical solution, the terminal side adapts to the network side's setting method for the mobile calling service corresponding to the TI, when the terminal switches from one voice bearer mechanism to another voice bearer mechanism (for example, by When the voice service carried in the PS domain is switched to the voice service carried in the CS domain), the continuity of the mobile calling service of the terminal can also be guaranteed, and the service quality guarantee of the user can be provided.

It should be understood that the connection response message, call progress message, session processing message, ringing message, connection message, release message, status query message, status message in this application can be understood as the Related signaling, or, can be understood as related signaling of circuit-switched call control services in the global system for mobile communications GSM, or can also refer to the third generation partnership project 3GPP TS24.008 V11.5.0 technical specifications Definition of relevant content in three sections.

BRIEF DESCRIPTION

1 is a schematic structural diagram of a communication system provided by an embodiment of this application;

2 is a schematic structural diagram of a service identifier according to an embodiment of the present application;

3 is a communication schematic diagram of a mobile calling service of a terminal provided by an embodiment of the present application;

4 is a schematic diagram of a single wireless voice call continuity SRVCC method for a terminal provided by an embodiment of the present application;

5 is a schematic diagram of a single wireless voice call continuity SRVCC method for a terminal provided by an embodiment of the present application;

6 is a schematic structural diagram of an apparatus provided by an embodiment of the present application;

7 is a schematic structural diagram of an apparatus provided by an embodiment of the present application;

8 is a schematic structural diagram of an apparatus provided by an embodiment of the present application;

9 is a schematic structural diagram of an apparatus provided by an embodiment of the present application;

10 is a schematic structural diagram of an apparatus provided by an embodiment of the present application.

It should be understood that in the foregoing structural schematic diagram, the size and shape of each block diagram are for reference only, and should not constitute an exclusive interpretation of the embodiments of the present application. The relative positions and inclusion relationships among the block diagrams presented in the structural schematic diagrams are only schematic representations of the structural associations among the block diagrams, and do not limit the physical connection manners of the embodiments of the present application.

detailed description

The technical solution provided by the present application will be further described below with reference to the drawings and embodiments. It should be understood that the system structure and business scenarios provided in the embodiments of the present application are mainly for illustrating possible implementations of the technical solution of the present application, and should not be interpreted as the only limitation to the technical solution of the present application. Those of ordinary skill in the art may know that with the evolution of the system structure and the emergence of new business scenarios, the technical solutions provided by the present application are also applicable to similar technical problems.

It should be understood that the solution for the mobile calling service of the terminal provided by the embodiments of the present application includes the method, device, and system for the mobile calling service of the terminal. Since the principles of these technical solutions to solve the problem are the same or similar, in the introduction of the following specific embodiments, some repetitions may not be repeated, but it should be considered that these specific embodiments have been mutually cited and can be combined with each other.

FIG. 1 is a schematic structural diagram of a wireless communication system according to an embodiment of the present invention. Figure 1 shows an uplink and downlink between a wireless network access device and a terminal, and between a base station and a terminal. It should be understood that although only two wireless network access devices and one terminal are shown in FIG. 1, the wireless communication system may also include other numbers of wireless network access devices and terminals. Optionally, the communication system may further include a core network that can communicate with the RAN. Further optionally, the communication system may further include one or more external networks interconnected with the core network. For example, the Internet, public switched telephone network (public switched telephone network), etc.

It should be understood that the communication system may be used as an example of a mobile communication system based on the 3rd Generation Partnership Project (3GPP) technical specifications, and may also cover wireless communication systems based on other wireless communication standards, such as electrical and electronic Institute of Engineers (Institute of Electrical and Electronic Engineers, IEEE) 802 series, such as 802.11, 802.15, 802.20 and other wireless communication standards, such as the Internet Engineering Task Force (IETF).

Among them, the wireless network access device is a computing device with wireless communication functions. Optionally, the network device 01 may be a wireless access network device such as a base station. Specifically, it may be a general node B (generation Node B, gNB) in a 5G mobile communication system, an evolutionary node B (eNB or eNodeB) in a 4G mobile communication system, and a base station in other possible wireless access technologies . The physical form and transmission power of the base station can also be various, such as a macro base station (macro base station) or a micro base station (micro base station). Optionally, the network device 02 may be a wireless access network device such as a base station, and may specifically be a node B (node B) of a 3G mobile communication system, a base station transceiver and a base station controller of a 2G mobile communication system.

The terminal may also be called a user equipment (UE), a mobile station or a subscriber unit. The terminal 02 may specifically be, but not limited to, a mobile phone, a tablet computer, a laptop computer, a wearable device (smart watch, smart bracelet, smart helmet, smart glasses, etc.), and other wireless devices Access-capable communication devices, such as various Internet of Things devices, including smart home devices (smart meters, smart home appliances, etc.), etc.

The communication system can work on multiple frequency bands, and is not limited to 5G systems, NR systems, M2M systems, etc., which are evolving in the future. It can be understood that the wireless communication system in FIG. 1 is only an exemplary implementation in the embodiments of the present application. The wireless communication systems in the embodiments of the present application include but are not limited to the above wireless communication systems.

FIG. 2 is a schematic structural diagram of a transaction identifier (TI) according to an embodiment of the present application. The terminal and the core network can exchange messages through a non-access stratum (NAS) service. Since multiple NAS services can be initiated at the same time, in order to distinguish which NAS service flow corresponds to each specific message, TI can be used in each NAS message to mark the service flow corresponding to the message. Referring to the TI structure shown in FIG. 2, when the technical specification does not specify the use of an extended structure, TI mainly includes two parts: TI flag (TI flag) and TI value (TI value). Among them, the TI flag occupies the 8th bit of the first octet (Octet) and is used to mark whether the current service is initiated by the message sender. When the TI flag is "0", it means that the message sender initiates the service. On the contrary, when the TI flag is "1", it means that the message receiver initiates the service. The TI value occupies the 5th to 7th bits of the first Octet and is used to mark different services. Specifically, when establishing a new NAS service, the sender who initiated the service will select a value from the unoccupied TI value to mark the service. In the subsequent communication process, both the sender and the receiver will use the TI value To mark messages that belong to the service.

Since the terminal side and the network side may initiate new NAS services at the same time, if the same TI value is selected on the terminal side and the network side, the TI flag is crucial for distinguishing specific services. For example, if the terminal initiates a mobile calling service (mobile originating service) and selects "100" as the TI value of the mobile calling service from the unoccupied TI value, the mobile calling service upstream message sent by the terminal at this time The middle TI flag should be "0" and the corresponding TI should be "0100". At the same time, the network side also initiated the short message service, and also selected "100" as the TI value of the short message service in the unoccupied TI value, then the TI flag bit in the short message service downlink message sent at this time should be "0", The corresponding TI is "0100". At this time, for the active call service, the TI of the corresponding upstream message is "0100", and the TI of the corresponding downstream message is "1000". For the short message service, the TI of the corresponding upstream message is "1000", and the TI of the corresponding downstream message is "0100". The terminal side can distinguish whether the NAS service is the mobile calling service or the short message service according to the TI flag of the downstream message. Similarly, the network side can distinguish whether the NAS service is the mobile calling service or the mobile calling service according to the TI flag of the upstream message. The SMS service.

For different network bearing mechanisms, voice calls for mobile communication can be divided into the following types:

The first type is the conversational service carried by the CS domain, such as voice telephony, etc .; the second type is the conversational service carried by the PS domain, also known as the network protocol bearer session (voice over internet protocol, VoIP) service, which provides services through IMS Quality assurance, such as VoLTE.

Therefore, for the above two different bearer mechanisms, during a user's voice call, when the terminal moves out of the network covered by the VoLTE hotspot and enters the coverage of the 2G or 3G network, it crosses the two A variety of different bearer mechanisms may interrupt voice calls. At this time, the continuity of the user's voice call will be affected. To this end, the SRVCC solution was introduced to ensure smooth switching between VoIP voice and CS domain voice. That is, the voice service carried in the PS domain on the LTE side is switched to the CS domain of UTRAN or GERAN.

According to the 3GPP technical specification TS 24.008 V11.4.0 and earlier versions, if the VoLTE service before SRVCC is initiated by the terminal side, after SRVCC, the message corresponding to the interaction between the terminal side and the network side corresponds to a TI value of "000", which corresponds to the TI The flag is set according to the way the call is initiated by the terminal side. That is, for the voice service, the TI flag in the upstream message is "0", the TI flag in the downstream message is "1", that is, the TI corresponding to the upstream message is "0000", and the TI corresponding to the downstream message is "1000". If the VoLTE service before SRVCC is initiated by the network side, after SRVCC, the corresponding TI value of the message exchanged between the terminal side and the network side is "000", and the corresponding TI flag is set according to the way the call is initiated by the network side. That is, for the voice service, the TI flag bit in the upstream message is "1", the TI flag in the downstream message is "0", the TI corresponding to the upstream message is "1000", and the TI corresponding to the downstream message is "0000".

According to the 3GPP technical specification TS 24.008 V11.5.0 and later, no matter whether the VoLTE service before SRVCC is initiated by the network side or by the terminal side, after SRVCC, the message corresponding to the interaction between the terminal side and the network side corresponds to a TI value of "000" , The corresponding TI flag is set according to the way the call is initiated by the network side. That is, for the voice service, the TI flag in the upstream message is "1", the TI flag in the downstream message is "0", that is, the TI corresponding to the upstream is "1000", and the TI corresponding to the downstream message is "0000".

In the actual communication process, the network side may adopt the 3GPP technical specification TS 24.008 V11.4.0 and earlier versions, or it may adopt the 3GPP technical specification TS 24.008 V11.5.0 and later versions. Similarly, the terminal side may adopt the 3GPP technical specification TS 24.008 V11.4.0 and earlier versions, or the 3GPP technical specification TS 24.008 V11.5.0 and later versions. In addition, the terminal side and the network side cannot know which version of the technical specifications the other party uses, which may cause the terminal and the network using different versions to be interrupted during the mobile calling service communication process.

FIG. 3 is a communication schematic diagram of a mobile calling service of a terminal provided by an embodiment of the present application. As shown in FIG. 3, the terminal initiates a mobile calling service in the network covered by the VoLTE hotspot, and gradually moves into the coverage of the 2G or 3G network. Among them, the terminal side adopts the 3GPP technical specification TS 24.008 V11.4.0 and earlier versions, and the network side adopts the 3GPP technical specification TS 24.008 V11.5.0 and later versions.

For the mobile calling service, switch to the coverage of the 3G network, the terminal will set the TI value in the upstream message to "000" and the TI flag to "0" according to the 3GPP technical specification TS 24.008 V11.4.0 and earlier versions , That is, the TI corresponding to the uplink message of the mobile calling service is "0000", and the TI value in the downlink message can also be set to "000", and the TI flag is "1", that is, the downlink message corresponding to the mobile calling service is expected The corresponding TI is "1000". However, because the network side will set the TI value in the downlink message to "000" and the TI flag to "0" according to the 3GPP technical specification TS 24.008 V11.5.0 and later versions, that is, the TI corresponding to the downlink message of the mobile calling service If it is "0000", the TI value in the upstream message can also be set to "000", and the TI flag is "1", that is, the TI corresponding to the upstream message corresponding to the mobile calling service is expected to be "1000".

In this case, the downlink message received by the UE is a connect message, where the TI value in the connect message is "000" and the TI flag is "0". The UE considers the downlink message to be illegal and cannot receive the expected connection message corresponding to the TI of "1000". The session cannot continue, which may result in voice interruption or dropped calls.

In order to solve the above problem, one method is that the terminal sets the TI in the service signaling after the SRVCC according to the location where the network is located and according to the technical specification version adopted by the location. For example, according to the region to be applied, the technical specification version adopted in the region is preset at the factory. For example, for a terminal to be applied in the A region, the technical specification version of the A region is 3GPP technical specification TS 24.008 V11.3.0, then the terminal is set to be set according to the 3GPP technical specification TS 24.008 V11.3.0.

However, when the terminal roams to the region B, and the network version of the region B is the 3GPP technical specification TS 24.008 V11.5.0 and later versions, it still cannot solve the above compatibility problem. Or, assuming that the network in area A has been upgraded with the network version and upgraded to the 3GPP technical specification TS 24.008 V11.5.0 and later, even if the terminal still initiates service communication in area A, the above-mentioned voice interruption problem may still occur.

In summary, UEs and networks that use different versions of the 3GPP technical specifications for communication may have compatibility issues during SRVCC in the mobile calling service, and call drops may occur. In order to solve the above problems, the embodiments of the present application provide a method, device and system for mobile calling service.

FIG. 4 is a schematic diagram of a single wireless voice call continuity SRVCC method for a terminal provided by an embodiment of the present application. The method may be performed by a communication device, which may be a terminal, or a chip that may be provided in the terminal. The chip may specifically be a baseband processor or a system chip (SoC). As shown in Figure 4, the method includes:

S401: Set a service identifier TI of the mobile calling service of the terminal. The service identifier TI of the mobile calling service includes a TI flag.

It should be understood that the service identification TI of the mobile calling service of the terminal may be set according to the technical specification version adopted by the terminal, and the service identification TI of the mobile calling service may include a TI flag. Wherein, the setting method may be a software module that sets related call functions of a software algorithm, or may also be a hardware circuit or device (such as a register) of a communication device that implements the method by setting.

Specifically, the service identifier TI of the mobile calling service of the terminal may be set according to the technical specifications adopted by the terminal. For example, the terminal adopts the technical specification version 3GPP technical specification TS 24.008 V11.4.0 and earlier versions, and can set the TI flag of the upstream message to "0" and the TI value to "000". Alternatively, the terminal adopts the technical specification version 3GPP technical specification TS 24.008 V11.5.0 and later versions, and can set the TI flag of the upstream message to "1" and the TI value to "000".

S402: Receive a downlink message of the mobile calling service, and the downlink message also includes the TI flag of the mobile calling service.

It should be understood that in order for the mobile calling service to remain continuous after the SRVCC, the downlink message corresponding to the mobile calling service should be received. Wherein, the downlink message should also include the TI flag of the mobile calling service. The TI flag of the mobile calling service can be the same as the TI flag set in the service identifier TI of the mobile calling service of the terminal. The values are the same or they may be different.

When the TI flag of the downlink message is "0", the terminal can be understood as the 3GPP technical specification TS 24.008 V11.5.0 and later adopted by the network, or the terminal can be understood as the network according to the mobile calling service Set the service identification TI of the mobile calling service; when the TI flag of the downlink message is "1", the terminal can confirm that the technical specification version adopted by the network is the 3GPP technical specification TS 24.008 V11.4.0 and earlier, Or, the terminal may be understood as that the network sets the service identification TI of the mobile calling service according to the mobile called service.

S403: When the value of the TI flag bit indicated by the downlink message does not match the value of the TI flag bit set by the terminal, enable the terminal to perform the mobile calling service according to the value of the TI flag bit indicated by the downlink message.

It should be understood that when the value of the TI flag bit indicated by the downlink message is inconsistent with the value of the TI flag bit set by the terminal, it can be understood that the setting method adopted by the terminal side for the TI corresponding to the mobile calling service and the network The setting method of the mobile calling service corresponding to the TI is different on the side, or it can be understood that the terminal side and the network side adopt different versions of the technical specifications. In order to ensure the continuity of the mobile calling service, the terminal The side adapts to the setting method or technical specification version adopted by the network side, enabling the terminal to perform the mobile calling service according to the value of the TI flag bit indicated by the downlink message.

With the above technical solution, it is possible to determine whether the terminal and the network side use the same setting method for the TI corresponding to the mobile calling service by receiving the downlink message corresponding to the mobile calling service, and adapt the network side to the terminal side. The mobile calling service corresponds to the setting method adopted by TI to enable the mobile calling service of the terminal to remain continuous.

In an optional embodiment, the service identifier TI of the mobile calling service further includes a TI value, the set TI value of the mobile calling service of the terminal and the TI of the mobile calling service in the downlink message The same value, the TI value of the mobile calling service is "000".

It should be understood that, in the received downlink message, it can be determined whether it is the downlink message of the mobile calling service based on the TI value of the mobile calling service. For example, in the received downlink message, there is a downlink message whose TI value is "000", then the downlink message is determined to be the downlink message of the mobile calling service. It can also receive the downlink message corresponding to the TI value and consider it as the downlink message of the mobile calling service. It should be understood that, in the subsequent communication process, before the mobile communication service is completed, the TI value may no longer be selected to initiate other services to prevent the service message corresponding to which service cannot be distinguished. It should be understood that the TI value of the mobile calling service may occupy 3 bits, or may occupy multiple other bits, and may also be expanded to other values. For example, the TI value of the mobile calling service can also be expanded to other values when the expansion bit is used, such as "0000000". This application does not limit the number of bits occupied by the TI value of the mobile calling service and the corresponding value.

Based on the above method or the optional embodiment, in an optional embodiment, the method further includes:

S404a: Send an uplink message of the mobile calling service, the TI flag in the uplink message is "0", wherein the TI flag of the mobile calling service of the terminal is set to "1", the downlink message The TI flag of the mobile calling service in is "0".

In another optional embodiment, the method further includes:

S404b: Send an uplink message of the mobile calling service, the TI flag in the uplink message is "1", wherein the TI flag of the mobile calling service of the terminal is set to "0", the downlink message The TI flag of the mobile calling service in is "1".

It should be understood that the TI flag of the mobile calling service of the terminal may occupy 1 bit, or may occupy more bits, which is not limited in this application.

Based on the above method or any one of the optional implementation manners, in an optional implementation manner, the uplink message of the mobile calling service is a connect response message.

Based on the above method or any one of the optional implementation manners, in an optional implementation manner, the downlink message is a call processing (call procedure) message. In another optional implementation manner, the downlink message is an alerting (alerting) message. In yet another optional embodiment, the downlink message is a connecting message.

FIG. 5 is a schematic diagram of a single wireless voice call continuity SRVCC method for a terminal provided by an embodiment of the present application. The method may be performed by a communication device, which may be a terminal, or a chip that may be provided in the terminal. The chip may specifically be a baseband processor or a system chip (SoC). As shown in Figure 5, the method includes:

S501: Send a first uplink message of the mobile calling service of the terminal, where the first uplink message includes a service identification TI flag of the mobile calling service.

It should be understood that the first uplink message including the service identification TI flag of the mobile calling service may be sent according to the technical specification version adopted by the terminal. The first uplink message here may be a status query message.

S502: Receive the first downlink message of the mobile calling service.

S503: When the first downlink message instructs the terminal to release resources, send a second uplink message for the mobile calling service of the terminal, the value of the service flag TI flag in the first uplink message and the second uplink message The value of the TI flag in the service identifier in is different.

Specifically, when the downlink message indicates the release of all mobility management connections, the terminal can understand that the technical specification version adopted by the network is the 3GPP technical specification TS 24.008 V11.5.0 and later versions, or, the terminal can understand this The network sets the service identification TI of the mobile calling service according to the mobile called service; otherwise, the terminal can confirm that the technical specification version adopted by the network is the 3GPP technical specification TS 24.008 V11.4.0 and earlier versions, or the terminal can It is understood that the network sets the service identification TI of the mobile calling service according to the mobile calling service.

It should be understood that when the downlink message does not instruct the terminal to release resources, it can be understood that the terminal side and the network side adopt the same setting method for the TI corresponding to the mobile calling service, and there is no compatibility problem. The terminal and the mobile calling service can be performed according to the set service identifier TI of the mobile calling service of the terminal.

In an optional implementation manner, the method further includes: receiving the second downlink message of the mobile calling service according to the value of the service identifier TI flag in the second uplink message.

Based on the above method or an optional implementation manner, in an optional implementation manner, the value of the service identifier TI flag in the first uplink message is used to indicate a mobile calling service, and the second uplink The value of the TI flag in the service identifier in the message is used to indicate the mobile called service. Further, optionally, the value of the service identifier TI flag in the first uplink message is "0", and the value of the service identifier TI flag in the second uplink message is "1".

In another optional embodiment, the value of the service identifier TI flag in the first uplink message is used to indicate a mobile calling service, and the value of the service identifier TI flag in the second uplink message is Yu means mobile called business. Further, optionally, the value of the service identifier TI flag in the first uplink message is "1", and the value of the service identifier TI flag in the second uplink message is "0".

Based on the above method or any optional implementation manner, in an optional implementation manner, the first uplink message includes a service identification TI value of the mobile calling service, and the second uplink message includes The service identifier TI value of the mobile calling service, and the service identifier TI value of the mobile calling service is "000".

Based on the above method or any optional embodiment, in an optional embodiment, the first uplink message and the second uplink message are for a circuit-switched call control service in a universal mobile communication system UMTS Status query message. In another optional implementation manner, the first uplink message is a status query message of a call control service of a circuit-switched domain in a universal mobile communication system UMTS, and the second uplink message is a circuit in a universal mobile communication system UMTS The connection response message of the call control service in the switching domain.

Based on the above method or any optional embodiment, in an optional embodiment, the first downlink message is a release message of a call control service in a circuit-switched domain in a universal mobile communication system UMTS.

Based on the above method or any optional embodiment, in an optional embodiment, the second downlink message is a connection message of a call control service in a circuit-switched domain in a universal mobile communication system UMTS.

Specifically, there are several possible processes of the method described in FIG. 4 and FIG. 5:

For the terminal that initiates the mobile calling service within the coverage of the VoLTE hotspot, it gradually moves out of the coverage of the VoLTE hotspot and gradually enters the coverage of the 2G or 3G network. When receiving the downlink message, which is a Mobility from E-UTRA COMMAND message, it is judged that the SRVCC has returned to the 2G or 3G network.

In order to ensure the continuity of the mobile calling service, the downlink message corresponding to the mobile calling service can be received. Specifically, it can be determined whether it is a downlink message of the mobile calling service based on the TI value of the mobile calling service in the received downlink message. For example, in the received downlink message, there is a downlink message whose TI value is "000", then the downlink message is determined to be the downlink message of the mobile calling service. It can also receive the downlink message corresponding to the TI value and consider it as the downlink message of the mobile calling service. For example, a downlink message corresponding to a TI value of "000" is received and considered to be a downlink message corresponding to a mobile calling service.

In the following, the terminal sets the TI value of the mobile calling service to "000", the TI flag of the upstream message is "0", and the TI flag of the downstream message is "1" as an example.

The downlink message may be a ringing message, and when the TI flag of the downlink message is "0", the terminal may be enabled to perform the mobile calling service according to the value of the TI flag indicated by the downlink message. Further, a connection message can also be received, and the TI flag of the connection message is also "0". Further, a connection response message can also be sent, and the TI flag of the connection response message is "1".

Alternatively, the downlink message may also be a connection message, and when the TI flag of the downlink message is "0", the terminal may be enabled to perform the mobile calling service according to the value of the TI flag indicated by the downlink message. Further, a connection response message may also be sent, and the TI flag of the connection response message is "1". The TI values of the above messages are all "000".

Or, the downlink message may be a ringing message, and when the TI flag of the downlink message is "1", the mobile calling service is performed according to the set TI flag of the mobile calling service of the terminal. Further, the connection message can also be received, and the TI flag bit of the connection message is also "1". Further, the connection response message can also be sent, and the TI flag bit of the connection response message is "0".

Or, the downlink message may also be a connection message, and when the TI flag of the downlink message is "0", the set TI flag of the mobile calling service of the terminal is used to perform the mobile calling service. Further, a connection response message may also be sent, and the TI flag of the connection response message is "1". The TI values of the above messages are all "000".

In the following, the terminal sets the TI value of the mobile calling service to "000", the TI flag of the upstream message is "1", and the TI flag of the downstream message is "0" as an example.

When the TI flag of the downlink message is "0", the terminal can understand that the technical specification version adopted by the network is the 3GPP technical specification TS 24.008 V11.5.0 or later, or the terminal can understand that the network is in accordance with The mobile calling service sets the service identification TI of the mobile calling service; when the TI flag of the downlink message is "1", the terminal can confirm that the technical specification version adopted by the network is the 3GPP technical specification TS 24.008 V11.4.0 and Earlier versions, or the terminal may understand that the network sets the service identification TI of the mobile calling service according to the mobile called service.

The downlink message may be a ringing message, and when the TI flag bit of the downlink message is "1", the terminal may be enabled to perform the mobile calling service according to the value of the TI flag bit indicated by the downlink message. Further, the connection message can also be received, and the TI flag bit of the connection message is also "1". Further, the connection response message can also be sent, and the TI flag bit of the connection response message is "0".

Or, the downlink message may also be a connection message, and when the TI flag of the downlink message is "1", the terminal may be enabled to perform the mobile calling service according to the value of the TI flag indicated by the downlink message. Further, a connection response message may also be sent, and the TI flag of the connection response message is "0". The TI values of the above messages are all "000".

Or, the downlink message may be a ringing message, and when the TI flag of the downlink message is "0", the mobile calling service is performed according to the set TI flag of the mobile calling service of the terminal. Further, a connection message can also be received, and the TI flag of the connection message is also "0". Further, a connection response message can also be sent, and the TI flag of the connection response message is "1".

To ensure the continuity of the mobile calling service, an uplink message corresponding to the mobile calling service can be sent. Specifically, whether it is a downlink message of the mobile calling service can be determined by whether the received downlink message indicates the release of all mobility management connections.

When the downlink message indicates the release of all mobility management connections, the terminal can understand that the technical specification version adopted by the network is the 3GPP technical specification TS 24.008 V11.5.0 and later versions, or the terminal can understand that the network follows the mobile The called service sets the service identification TI of the mobile calling service; otherwise, the terminal can confirm that the technical specification version adopted by the network is the 3GPP technical specification TS 24.008 V11.4.0 and earlier versions, or, the terminal can be understood as the The network sets the service identification TI of the mobile calling service according to the mobile calling service.

When the downlink message indicates that all mobility management connections are released, the TI flag of the mobile calling service of the terminal is updated to enable the terminal to perform the mobile calling service according to the updated TI flag of the mobile calling service . An uplink message is sent. The uplink message may be a connection response message, and the TI flag of the connection response message is "1".

Otherwise, an upstream message is sent, which may be a connection response message, and the TI flag of the connection response message is "0". The TI values of the above messages are all "000".

When the downlink message indicates the release of all mobility management connections, the terminal can confirm that the technical specification version adopted by the network is the 3GPP technical specification TS 24.008 V11.4.0 and earlier versions, or, the terminal can be understood that the network follows the mobile The calling service sets the service identification TI of the mobile calling service; otherwise, the terminal can be understood as the technical specification version adopted by the network is the 3GPP technical specification TS 24.008 V11.5.0 and later versions, or the terminal can be understood as the The network sets the service identification TI of the mobile calling service according to the mobile called service.

When the downlink message indicates that all mobility management connections are released, the TI flag of the mobile calling service of the terminal is updated to enable the terminal to perform the mobile calling service according to the updated TI flag of the mobile calling service . An uplink message is sent. The uplink message may be a connection response message, and the TI flag of the connection response message is "0".

Otherwise, an uplink message is sent, which may be a connection response message, and the TI flag of the connection response message is "1". The TI values of the above messages are all "000".

It should be understood that the above uplink message and downlink message may be NAS signaling, and may be carried by a signal radio bearer (signaling radio bearer, SRB).

6 is a schematic structural diagram of an apparatus provided by an embodiment of the present application. The device may be a terminal in the wireless communication system of the embodiment of the present application, or may be a chip or a circuit that can be provided in the terminal. The chip may specifically be a baseband processor or an SoC chip, and may implement the method for mobile calling service of a terminal as shown in FIG. 4 in the present application, and the above optional embodiments. In the exemplary design shown in FIG. 6, the device 10A includes: a setting unit 110, a receiving unit 120 and a processing unit 130.

The setting unit 110 is used to set the service identification TI of the mobile calling service of the terminal, and the service identification TI of the mobile calling service includes a TI flag; the receiving unit 120 is used to receive a downlink message of the mobile calling service. The downlink message also includes the TI flag of the mobile calling service; the processing unit 130 is configured to enable the terminal when the value of the TI flag indicated by the downlink message does not match the value of the TI flag set by the terminal Perform the mobile calling service according to the value of the TI flag bit indicated by the downlink message.

In an alternative embodiment, the setting unit 110 may be a processor, a sending circuit or a transceiver circuit, the receiving unit 120 may be a receiver, a receiving circuit, a transceiver or a transceiver circuit, and the processing unit 130 may be a processor. In an optional software implementation, the setting unit 110, the receiving unit 120, and the processing unit 130 may be software modules. In an optional combination of hardware and software, the setting unit 110 may be a processor, a sending circuit or a transceiver circuit combined with a software module, and the receiving unit 120 may be a receiver, a receiving circuit, a transceiver or One of the transceiver circuits is combined with the software module, and the processing unit 130 may be a combination of the processor and the software module. In another optional implementation manner, the above three optional implementation manners of the setting unit 110, the receiving unit 120, and the processing unit 130 may also be combined with each other to form a new implementation manner.

It should be understood that when the device 10A is a baseband processor, the receiving unit and the sending unit may be chip pins of the baseband processor, or may also be an interface connected to the bus. When the device 10A is an SoC chip, the receiving unit and the sending unit may be chip pins of the SoC chip, or may also be an interface connected to a bus, or may also be a transceiver circuit.

7 is a schematic structural diagram of an apparatus provided by an embodiment of the present application. The device may be a terminal in the wireless communication system of the embodiment of the present application, or may be a chip or a circuit that can be provided in the terminal. The chip may specifically be a baseband processor or an SoC chip, and may implement the method for mobile calling service of a terminal as shown in FIG. 5 in the present application, and the above optional embodiments. In the exemplary design shown in FIG. 7, the device 10B includes a receiving unit 140 and a sending unit 120.

The sending unit 140 is used to send a first uplink message of the mobile calling service of the terminal, the first uplink message includes a service identifier TI flag of the mobile calling service; the receiving unit 120 is used to receive the mobile calling service Downlink message; the sending unit 140 is also used to send a second uplink message of the mobile calling service of the terminal when the first downlink message instructs the terminal to release resources, and a service identifier TI flag of the first uplink message The value of the bit is different from the value of the service identification TI flag of the second uplink message.

It should be understood that the sending unit 140 and the receiving unit 120 herein may be chip pins of a baseband processor, or may be an antenna module and / or a radio frequency subsystem of the terminal, or various transceiver circuits. The sending unit 120 may also be a transmitter, a sending circuit, a transceiver, or a combination of a transceiver module and a software module.

It should be understood that when the device 10B is a baseband processor, the receiving unit and the sending unit may be chip pins of the baseband processor, or may also be an interface connected to the bus. When the device 10B is an SoC chip, the receiving unit and the sending unit may be chip pins of the SoC chip, or may also be an interface connected to a bus, or may also be a transceiver circuit.

8 is a schematic structural diagram of an apparatus provided by an embodiment of the present application. The device may be a terminal in the wireless communication system of the embodiment of the present application, or may be a chip or a circuit that can be provided in the terminal. The chip may specifically be a baseband processor or an SoC chip, and may implement the method for mobile calling service of a terminal shown in FIGS. 4 to 5 in this application, and the above optional embodiments. In the exemplary design shown in FIG. 8, the device 20 includes a receiving circuit 210, a processor 220 and a transmitting circuit 230. It should be understood that although only one receiving circuit and one processor are shown in FIG. 8, the device 20 may further include other numbers of receiving circuits or processors or transmitting circuits. Through the cooperation between the processor, the receiving circuit, and the transmitting circuit, the method in the embodiments of the present application can be implemented.

It should be understood that the receiving circuit 210 and the transmitting circuit 230 may be integrated in one physical entity, such as a transceiver (transceiver), or may be integrated in different physical entities, such as a receiver (receiver) and a transmitter (transmitter). Here, the receiving circuit 210 and the transmitting circuit 230 may also be coupled to an antenna to wirelessly connect with other communication devices.

In addition, the device 20 may further include a memory 240, a connecting line 250, and an I / O interface. The memory 240 is used to store computer programs or computer instructions. When the computer program or instruction is executed by the processor 220, the apparatus 20 is enabled to implement the steps of the communication apparatus in the wireless communication method of the embodiment of the present application. Such computer programs or instructions may be recorded as function programs of terminal-related communication devices. The I / O interface provides the possibility of interaction with other communication devices or users. For example, the I / O interface may be a screen, keyboard, microphone, speaker, USB interface, etc. Various components inside the device 20 can be coupled together through various connection lines (such as a bus system), where the bus system can include a power bus, a control bus, a status signal bus, and the like in addition to a data bus. However, for the sake of clarity, all buses are collectively referred to as a bus system in this article.

It should be understood that in the embodiment of the present invention, when the function program of the terminal-related communication device is stored in the memory 240, the wireless communication device 20 may be a terminal in the wireless communication system of the embodiment of the present invention, or may be set in The chip or circuit in the terminal.

9 is a schematic structural diagram of an apparatus provided by an embodiment of the present application. The device may be a terminal in the wireless communication system of the embodiment of the present application, or may be a chip or a circuit that can be provided in the terminal. The chip may specifically be a baseband processor or an SoC chip, and may implement the method for mobile calling service of a terminal as shown in FIGS. 4 to 5 in this application, and the foregoing optional embodiments. In the exemplary design shown in FIG. 10, the device 30 includes an antenna module 310, a radio frequency (RF) subsystem 320 coupled with the antenna module 310, and a baseband subsystem 330 coupled with the radio frequency subsystem 320.

In an optional implementation manner, the baseband subsystem 330 is used to set a service identifier TI of the mobile calling service of the terminal, and the service identifier TI of the mobile calling service includes a TI flag; an antenna module 310 and a radio frequency subsystem 320, Receive the downlink message of the mobile calling service, the downlink message also includes the TI flag of the mobile calling service; the baseband subsystem 330 is also used to indicate the value of the TI flag in the downlink message and the terminal ’s When the value of the set TI flag bit is inconsistent, the terminal is enabled to perform the mobile calling service according to the value of the TI flag bit indicated by the downlink message.

Specifically, the antenna module 310 may be used to receive a signal and input the radio frequency subsystem 320 in the form of a radio frequency signal corresponding to the signal. The radio frequency subsystem 320 may be used to process the received radio frequency signal (for example, filtering, noise reduction, amplification, etc.), and down-convert the radio frequency signal to a baseband signal for processing by the baseband subsystem 330, wherein the radio frequency subsystem 320 may include two modules of a radio frequency front-end module 321 and a radio frequency transceiver module 342. The baseband subsystem 330 may be used to implement the method for mobile calling service of the terminal shown in FIGS. 4 to 5 in the present application based on the received signal, and the above optional embodiments.

10 is a schematic structural diagram of an apparatus provided by an embodiment of the present application. This device is based on the device shown in FIG. 9, and further introduces some optional implementation manners of the embodiments of the present application. For details, reference may be made to the description of FIG. 9, and repeated contents are not described here. In the exemplary design shown in FIG. 9, the device 40 includes an antenna module 410, a radio frequency subsystem 420 coupled with the antenna module 410, and a baseband subsystem 430 coupled with the radio frequency subsystem 420.

In addition, the device 40 may further include: a first memory 460 coupled to the baseband subsystem 430. The baseband subsystem 430 includes a processor 431 and a second memory 432. The first memory 460 and the second memory 432 in the baseband subsystem 430 are coupled. The first memory 460 may be a non-volatile memory (non-volatile memory), and the second memory 432 may be a volatile memory (volatile memory) or a non-volatile memory. Specifically, volatile memory refers to memory that loses internally stored data when power supply is interrupted. At present, volatile memory is mainly random access memory (random access memory, RAM), including static random access memory (static RAM) and dynamic random access memory (dynamic RAM). Non-volatile memory refers to memory that does not lose data stored internally even if the power supply is interrupted. Common non-volatile memory includes read-only memory (read only memory), optical disks, magnetic disks, solid-state drives, and various memory cards based on flash memory technology. Specifically, the first memory 460 may be used to store one or more instructions corresponding to any method provided in the embodiments of the present application. After the device 40 is powered on, the code is loaded into the second memory 432 and executed by the processor 431 . Referring to FIG. 9, the code may be a method for implementing the mobile calling service of the terminal as shown in any one of FIGS. 4 to 5 in the present application, and the code corresponding to the foregoing optional embodiments. It should be understood that the processor 431 may further include a cache, which is connected to the second memory 432, and executes the method for the mobile calling service of the terminal in the embodiments of the present application and the above optional embodiments , Cache the code of the second memory 432 into the cache to be executed by the processor.

It should be understood that each part of the devices in the embodiments of the present application may be integrated into one chip or integrated circuit, or may be combined into different chips or circuits, or may constitute a complete machine (for example, terminal, base station, etc.), which belong to the embodiments of the present application Scope of protection. It should be understood that in the embodiment of the present application, the radio frequency transceiver module 342 may also be a radio frequency receiving module or a radio frequency receiving module, which may be integrated with the baseband subsystem 330 or / and the antenna module 310, or may be integrated with the baseband subsystem 330 Or / and the antenna module 310 are provided separately.

Specifically, several possible specific processes are as follows:

For the terminal that initiates the mobile calling service within the coverage of the VoLTE hotspot, it gradually moves out of the coverage of the VoLTE hotspot and gradually enters the coverage of the 2G or 3G network. The antenna module 310 receives the downlink message and enters the RF subsystem in the form of an RF signal corresponding to the signal; the RF subsystem 320 processes the received RF signal (eg, filtering, noise reduction, amplification, etc.) The frequency is down-converted to the baseband signal for processing by the baseband subsystem 330. The baseband subsystem can determine that the terminal has returned from the VoLTE network SRVCC to the 2G or 3G network according to the downlink message being the Mobility from E-UTRA COMMAND message.

The baseband subsystem sets the TI value of the mobile calling service to "000", the TI flag of the upstream message is "0", and the TI flag of the downstream message is "1". And configure the radio frequency transceiver circuit to receive the downlink message of the mobile calling service. The downlink message also includes the TI flag of the mobile calling service, but the TI flag of the mobile calling service in the downlink message can be the same as the TI flag of the mobile calling service set by the baseband subsystem, or Can be different.

The downlink message also includes the TI value of the mobile calling service, and the TI value is "000".

A specific implementation manner of the baseband subsystem receiving the downlink message of the mobile calling service may be to receive a downlink message, and select a downlink message having a TI value of "000" from the received downlink messages, and confirm that the mobile caller Downstream message called business. Alternatively, another implementation manner may be to configure a radio frequency receiving circuit to receive a downlink message, and select a downlink message having a TI value of "000" among the received downlink messages, and confirm the downlink message of the mobile calling service. Or, another embodiment may be to directly receive a downlink message with a TI value of “000”.

When the baseband subsystem determines that the TI flag of the downlink message is inconsistent with the TI flag of the downlink message of the mobile calling service set by the baseband subsystem (for example, the TI flag of the downlink message is "0"), enable The terminal performs the mobile calling service according to the TI flag of the downlink message. Here, the downlink message may be one or more of call progress message, ring message, and connection message.

An uplink message of the mobile calling service with a TI value of "000" and a TI flag of "1" may also be sent. The uplink message may be a connection response message.

Or, the baseband subsystem sets the TI value of the mobile calling service to "000", the TI flag of the upstream message is "0", and the TI flag of the downstream message is "1". And the radio frequency transceiver circuit can be configured to send the uplink message of the mobile calling service, wherein the TI flag of the uplink message is "0" and the TI value is "000", and the uplink message can be a connection response message.

When receiving the release message, the baseband subsystem updates the TI value of the mobile calling service of the terminal, and the updated TI value of the mobile calling service of the terminal is "0", enabling the terminal to update the The TI value of the mobile calling service of the terminal is used for communication of the mobile calling service.

The baseband subsystem may configure a radio frequency transceiver circuit to send the uplink message of the mobile calling service, where the TI flag of the uplink message is "1" and the TI value is "000", and the uplink message may be a connection response message.

In order to introduce the technical solutions of the embodiments of the present application in more detail, the present application also provides the following optional embodiments.

Example 1

The terminal adopts the 3GPP technical specification TS 24.008 V11.4.0 and earlier versions (such as the 3GPP technical specification TS 24.008 V11.0.0), and the network uses the 3GPP technical specification TS 24.008 V11.5.0 and later versions (such as 3GPP TS 24.008 V12.4.0) as example.

The terminal initiates a mobile calling service within the coverage of the VoLTE network, and gradually moves from the coverage of the VoLTE network to the coverage of the 2G or 3G network during the establishment of the mobile calling service. The mobile calling service of the terminal is switched from the PS domain to the CS domain through SRVCC.

(1) Set the service identifier TI of the mobile calling service of the terminal. For the uplink message of the mobile calling service, the value of the set TI flag is "0" and the TI value is "000". For the downlink message of the mobile called service, the value of the set TI flag is "1" and the TI value is "000".

Receiving the downlink message of the mobile calling service, the TI flag bit indicated in the downlink message of the mobile calling service is "0", enabling the terminal to perform the mobile calling service according to the value of the TI flag bit indicated by the downlink message . Specifically, a downlink message with a TI flag value of "0" and a TI value of "000" may be received, and / or an uplink message with a TI flag value of "1" and a TI value of "000" may be sent. The downlink message here may be a ringing message or a connection message, and the uplink message may be a connection response message.

or,

(2) Send an uplink message of the mobile calling service of the terminal, wherein the TI value of the uplink message is "000" and the value of the TI flag bit is "0". The uplink message may be a status query message.

Receive the downlink message of the mobile calling service, the downlink message indicates the release of resources, and resend the uplink message of the mobile calling service with a TI flag value of "1" and a TI value of "000". Alternatively, other upstream messages (for example, connection response messages) of the mobile calling service with a TI flag value of "1" and a TI value of "000" are sent. Alternatively, other downlink messages of the mobile calling service with a TI flag value of "0" and a TI value of "000" can also be received.

Here, the uplink message may be a status query message. The downlink message may be a release message, and the other downlink messages may be status messages, session processing messages, ringing messages, and connection messages.

Example 2

The terminal adopts the 3GPP technical specification TS 24.008 V11.5.0 and later versions (such as 3GPP TS 24.008 V12.4.0), and the network uses the 3GPP technical specification TS 24.008 V11.4.0 and earlier versions (such as the 3GPP technical specification TS 24.008 V11.0.0) as example.

(1) Set the service identifier TI of the mobile calling service of the terminal. For the upstream message of the mobile calling service, the value of the set TI flag is "1" and the TI value is "000". For the downlink message of the mobile called service, the value of the set TI flag is "0" and the TI value is "000".

Receiving the downlink message of the mobile calling service, the TI flag bit indicated in the downlink message of the mobile calling service is "1", enabling the terminal to perform the mobile calling service according to the value of the TI flag bit indicated by the downlink message . Specifically, a downlink message with a TI flag value of "1" and a TI value of "000" may be received, and / or an uplink message with a TI flag value of "0" and a TI value of "000" may be sent. The downlink message here may be a ringing message or a connection message, and the uplink message may be a connection response message.

or,

(2) Send an uplink message of the mobile calling service of the terminal, where the TI value of the uplink message is "000" and the value of the TI flag bit is "1". The uplink message may be a status query message.

Receive the downlink message of the mobile calling service, the downlink message indicates the release of resources, and resend the uplink message of the mobile calling service with a TI flag value of "0" and a TI value of "000". Alternatively, other upstream messages (for example, connection response messages) of the mobile calling service with a TI flag value of "0" and a TI value of "000" are sent. Alternatively, other downlink messages of the mobile calling service with a TI flag value of "1" and a TI value of "000" can also be received.

Here, the uplink message may be a status query message. The downlink message may be a release message, and the other downlink messages may be one or more of status messages, session processing messages, ringing messages, and connection messages.

Example 3

The terminal adopts the 3GPP technical specification TS 24.008 V11.4.0 and earlier versions (such as the 3GPP technical specification TS 24.008 V11.0.0), and the network uses the 3GPP technical specification TS 24.008 V11.4.0 and earlier versions (such as the 3GPP technical specification TS 24.008 V11. 0.0) as an example.

The downlink message of the mobile calling service is received, and the TI flag bit indicated in the downlink message of the mobile calling service is "1". The value of the TI flag of the upstream message and the downstream message adopted by the terminal and the network is consistent. A downlink message with a TI flag value of "1" and a TI value of "000" can be received, and / or an uplink message with a TI flag value of "0" and a TI value of "000" can be sent. The other downlink messages here may be one or more of session processing messages, ringing messages, and connection messages.

or,

Receive the downlink message of the mobile calling service. The TI value of the downlink message is "000" and the value of the TI flag is "1". The downlink message here may be one or more of status message session processing message, ringing message, and connection message.

A connection response message with a TI value of "000" and a TI flag value of "0" can also be sent.

Example 4

The terminal adopts the 3GPP technical specifications TS 24.008 V11.5.0 and later versions (such as 3GPP TS 24.008 V12.4.0), and the network adopts the 3GPP technical specifications TS 24.008 V11.5.0 and later versions (such as 3GPP TS 24.008 V12.4.0) The network uses the 3GPP technical specification TS 24.008 V11.4.0 and earlier versions (such as the 3GPP technical specification TS 24.008 V11.0.0) as an example.

Receive the downlink message of the mobile calling service, and the TI flag bit indicated in the downlink message of the mobile calling service is "0". The value of the TI flag of the upstream message and the downstream message adopted by the terminal and the network is consistent. A downlink message with a TI flag value of "0" and a TI value of "000" can be received, and / or an uplink message with a TI flag value of "1" and a TI value of "000" can be sent. The downlink message here may be a ringing message or a connection message, and the uplink message may be a connection response message.

or,

Receive the downlink message of the mobile calling service. The TI value of the downlink message is "000" and the value of the TI flag is "0".

The downlink message here may be one or more of status messages, session processing messages, ringing messages, and connection messages.

The terms "first", "second", "third", "fourth", etc. in the embodiments of the present application and the drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. In addition, the terms "including" and "having" and any variations thereof are intended to represent non-exclusive inclusion, for example, including a series of steps or units. A method, system, product, or device need not be limited to those steps or units that are listed literally, but may include other steps or units that are not listed literally or are inherent to these processes, methods, products, or equipment.

It should be understood that in this application, the size of the sequence numbers of the above processes does not mean that the execution order is sequential, and the execution order of each process should be determined by its function and inherent logic, and should not constitute any implementation process of the embodiments of this application. limited. The term "coupled" mentioned in this application is used to express the intercommunication or interaction between different components, and may include direct connection or indirect connection through other components.

In this application, a processor refers to a device or a circuit with computational processing capabilities, and may be called a chip or a central processing unit (English: central processing unit, CPU). The aforementioned processor may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic devices, or transistor logic devices, and discrete hardware components. , Microprocessor. The processor can be integrated in a system on chip (SOC). Among them, the baseband processor may also be called a modem (Modem).

Memory refers to devices or circuits that have data or information storage capabilities, and can provide instructions and data to the processor. Memory includes read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), non-volatile random access memory (NVRAM), programmable read-only memory or electrically erasable and programmable Memory, registers, etc.

In the above-mentioned embodiments of the present application, it can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the processes or functions according to the embodiments of the present application are generated in whole or in part. The computer may be a general-purpose computer, a dedicated computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions can be transmitted from a website site, computer, server or data center via wire (For example, coaxial cable, optical fiber, etc.) or wireless (for example, infrared, radio, microwave, etc.) to another website, computer, server, or data center. The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device that includes one or more available medium integrated servers, data centers, and the like. The available media may be magnetic media, such as floppy disks, hard disks, and magnetic tapes; optical media, such as DVDs; or semiconductor media, such as solid state disks (SSD).

The above is only the specific implementation of this application, but the scope of protection of this application is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in this application. Covered within the scope of protection of this application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

A single wireless voice call continuity SRVCC method for a terminal, which is characterized in that it includes:

Set a service identifier TI of the mobile calling service of the terminal, and the service identifier TI of the mobile calling service includes a TI flag;

Receiving the downlink message of the mobile calling service, the downlink message also includes the TI flag of the mobile calling service;

When the value of the TI flag bit indicated by the downlink message does not match the value of the TI flag bit set by the terminal, the terminal is enabled to perform the mobile calling according to the value of the TI flag bit indicated by the downlink message business.
The method of claim 1, wherein:

The service identifier TI of the mobile calling service further includes a TI value, and the set TI value of the mobile calling service of the terminal is the same as the TI value of the mobile calling service in the downlink message, The TI value of the mobile calling service is "000".
The method according to any one of claims 1 to 2, comprising:

Sending an uplink message of the mobile calling service, and the value of the TI flag in the uplink message is used to indicate the mobile called service;

Wherein, the value of the TI flag in the downlink message is used to indicate a mobile called service, and the value of the TI flag of the mobile calling service of the terminal is used to indicate a mobile calling service.
The method according to claim 3, characterized in that

The value of the TI flag bit in the uplink message is "1", the value of the TI flag bit in the downlink message is "0", the set TI in the uplink message of the mobile calling service of the terminal The value of the flag bit is "0", and the value of the TI flag bit in the downlink message of the mobile calling service of the terminal is "1".
The method according to any one of claims 1 to 2, comprising:

Sending an uplink message of the mobile calling service, and the value of the TI flag in the uplink message is used to indicate the mobile calling service;

Wherein, the value of the TI flag in the downlink message is used to indicate a mobile calling service, and the value of the set service identifier TI of the mobile calling service of the terminal is used to indicate a mobile called service.
The method of claim 5, comprising:

The value of the TI flag bit in the uplink message is "0", the value of the TI flag bit in the downlink message is "1", and the set TI in the uplink message of the mobile calling service of the terminal The value of the flag bit is "1", and the value of the TI flag bit in the downlink message of the mobile calling service of the terminal is "0".
The method according to any one of claims 3 to 6, characterized in that:

The uplink message of the mobile calling service is a connection response message of the call control service of the circuit-switched domain in the universal mobile communication system UMTS.
The method according to any one of claims 1 to 7, characterized in that:

The downlink message is a connection message of a call control service in the circuit switched domain in the universal mobile communication system UMTS.
A single wireless voice call continuity SRVCC method for a terminal, which is characterized in that it includes:

Sending a first uplink message of the mobile calling service of the terminal, where the first uplink message includes a service identification TI flag of the mobile calling service;

Receiving the first downlink message of the mobile calling service;

When the first downlink message instructs the terminal to release resources, a second uplink message of the mobile calling service of the terminal is sent, and the value of the service flag TI flag in the first uplink message and the first The value of the TI flag in the second uplink message is different.
The method of claim 9, further comprising:

Receiving the second downlink message of the mobile calling service according to the value of the service identifier TI flag in the second uplink message.
The method according to any one of claims 9 to 10, characterized in that:

The value of the service identifier TI flag in the first uplink message is used to indicate mobile calling services, and the value of the service identifier TI flag in the second uplink message is used to indicate mobile called services.
The method according to claim 11, characterized in that:

The value of the service identifier TI flag in the first uplink message is "0", and the value of the service identifier TI flag in the second uplink message is "1".
The method according to any one of claims 9 to 10, characterized in that:

The value of the service identifier TI flag in the first uplink message is used to indicate mobile called services, and the value of the service identifier TI flag in the second uplink message is used to indicate mobile calling services.
The method according to claim 13, characterized in that:

The value of the service identifier TI flag in the first uplink message is "1", and the value of the service identifier TI flag in the second uplink message is "0".
The method according to any one of claims 9 to 14, characterized in that:

The first uplink message includes a service identifier TI value of the mobile calling service, the second uplink message includes a service identifier TI value of the mobile calling service, and the service identifier TI value of the mobile calling service is "000".
The method according to any one of claims 9 to 15, characterized in that:

The first uplink message and the second uplink message are status query messages of a circuit-switched call control service in a universal mobile communication system UMTS.
The method according to any one of claims 9 to 15, characterized in that:

The first uplink message is a status query message of a call control service of a circuit-switched domain in the universal mobile communication system UMTS, and the second uplink message is a connection response message of a call control service of a circuit-switched domain in the universal mobile communication system UMTS.
The method according to any one of claims 9 to 17, characterized in that:

The first downlink message is a release message of the call control service of the circuit switched domain in the universal mobile communication system UMTS.
The method according to any one of claims 9 to 18, characterized in that:

The second downlink message is a connection message of a call control service in a circuit switched domain in a universal mobile communication system UMTS.
A single wireless voice call continuity SRVCC device for a terminal, characterized in that it includes:

A setting unit, configured to set a service identifier TI of the mobile calling service of the terminal, and the service identifier TI of the mobile calling service includes a TI flag;

A receiving unit, configured to receive a downlink message of the mobile calling service, and the downlink message also includes a TI flag of the mobile calling service;

The processing unit is configured to enable the terminal to perform according to the value of the TI flag bit indicated by the downlink message when the value of the TI flag bit indicated by the downlink message does not match the value of the TI flag bit set by the terminal The mobile calling service.
The device according to claim 20, characterized in that:

The service identifier TI of the mobile calling service further includes a TI value, and the set TI value of the mobile calling service of the terminal is the same as the TI value of the mobile calling service in the downlink message, The TI value of the mobile calling service is "000".
The device according to any one of claims 20 to 21, further comprising:

A sending unit, configured to send the uplink message of the mobile calling service, and the value of the TI flag in the uplink message is used to indicate the mobile called service;

Wherein, the value of the TI flag in the downlink message is used to indicate a mobile called service, and the value of the TI flag of the mobile calling service of the terminal is used to indicate a mobile calling service.
The device according to claim 22, characterized in that:

The value of the TI flag bit in the uplink message is "1", the value of the TI flag bit in the downlink message is "0", the TI in the set uplink message of the mobile calling service of the terminal The value of the flag bit is "0", and the value of the TI flag bit in the downlink message of the mobile calling service of the terminal is "1".
The device according to any one of claims 20 to 21, further comprising:

A sending unit, configured to send the uplink message of the mobile calling service, and the value of the TI flag in the uplink message is used to indicate the mobile calling service;

Wherein, the value of the TI flag in the downlink message is used to indicate a mobile calling service, and the value of the set service identifier TI of the mobile calling service of the terminal is used to indicate a mobile called service.
The device according to claim 24, characterized in that:

The value of the TI flag bit in the uplink message is "0", the value of the TI flag bit in the downlink message is "1", and the set TI in the uplink message of the mobile calling service of the terminal The value of the flag bit is "1", and the value of the TI flag bit in the downlink message of the mobile calling service of the terminal is "0".
The method according to any one of claims 22 to 25, characterized in that:

The uplink message of the mobile calling service is a connection response message of the call control service of the circuit-switched domain in the universal mobile communication system UMTS.
The method according to any one of claims 20 to 26, characterized in that:

The downlink message is a connection message of a circuit-switched call control service in a universal mobile communication system UMTS.
A single wireless voice call continuity SRVCC device for a terminal, characterized in that it includes:

A sending unit, configured to send a first uplink message of the mobile calling service of the terminal, where the first uplink message includes a service identification TI flag of the mobile calling service;

A receiving unit, configured to receive the downlink message of the mobile calling service;

The sending unit is further configured to send a second uplink message of the mobile calling service of the terminal when the first downlink message instructs the terminal to release resources, and a service identifier TI flag of the first uplink message The value of the bit is different from the value of the TI flag of the service identifier of the second uplink message.
The device according to claim 28, characterized in that:

The receiving unit is further configured to receive the second downlink message of the mobile calling service according to the value of the service identifier TI flag of the second uplink message.
The device according to any one of claims 28 to 29, characterized in that:

The value of the TI flag of the service identifier of the first uplink message is used to indicate a mobile calling service, and the value of the TI flag of the service identifier of the second uplink message is used to indicate a mobile called service.
The device according to claim 30, characterized in that:

The value of the service identifier TI flag of the first uplink message is "0", and the value of the service identifier TI flag of the second uplink message is "1".
The device according to any one of claims 28 to 29, characterized in that:

The value of the TI flag of the service identifier of the first uplink message is used to indicate mobile called services, and the value of the TI flag of the service identifier of the second uplink message is used to indicate mobile calling services.
The device according to claim 32, characterized in that:

The value of the service flag TI flag of the first uplink message is "1", and the value of the service flag TI flag of the second uplink message is "0".
The device according to any one of claims 28 to 33, characterized in that:

The first uplink message includes a service identifier TI value of the mobile calling service, the second uplink message includes a service identifier TI value of the mobile calling service, and the service identifier TI value of the mobile calling service is "000".
The device according to any one of claims 28 to 34, characterized in that:

The first uplink message and the second uplink message are status query messages of a call control service in a circuit-switched domain in a universal mobile communication system UMTS.
The device according to any one of claims 28 to 34, characterized in that:

The first uplink message is a status query message of a call control service of a circuit-switched domain in the universal mobile communication system UMTS, and the second uplink message is a connection response message of a call control service of a circuit-switched domain in the universal mobile communication system UMTS.
The device according to any one of claims 28 to 36, characterized in that:

The first downlink message is a release message of the call control service of the circuit switched domain in the universal mobile communication system UMTS.
The device according to any one of claims 28 to 37, characterized in that:

The second downlink message is a connection message of a call control service in a circuit switched domain in a universal mobile communication system UMTS.