WO2020232584A1

WO2020232584A1 - Network selection system and terminal device

Info

Publication number: WO2020232584A1
Application number: PCT/CN2019/087473
Authority: WO
Inventors: 钟继磊; 段小嫣
Original assignee: 华为技术有限公司
Priority date: 2019-05-17
Filing date: 2019-05-17
Publication date: 2020-11-26
Also published as: CN113812176A; CN113812176B

Abstract

A network selection system and a terminal device for resolving the technical issue in the art in which a terminal device spends a long time selecting a network. The network selection system comprises: an access network device for broadcasting a system message carrying first information, wherein the first information is used to indicate whether or not a core network corresponding to the access network device supports internet protocol multimedia subsystem (IMS) voice; and a terminal device for receiving the system message, and determining, according to the first message, whether or not to select a cell covered by the access network device and to register therewith.

Description

Network selection system and terminal equipment

Technical field

This application relates to the field of communication technology, and in particular to a network selection system and terminal equipment.

Background technique

At present, the Internet protocol (IP) multimedia subsystem (IP multimedia subsystem, IMS) is used as a universal voice solution for 4G and 5G, so voice-centric IMS terminals (such as mobile phones) need to support IMS The voice-bearing cell registers for audio calls.

At present, when a terminal device selects a network, it first searches the network, and selects a cell that meets the conditions to register after the network search is completed, that is, sends a registration request to the core network device, and the core network device sends a registration reception to the terminal device after completing the registration process Message, where the registration reception message carries indication information for indicating whether to support IMS. Therefore, after receiving the registration reception message, the terminal device can determine whether the network supports IMS according to the indication information carried in the registration reception message, and if so, the terminal device initiates the IMS registration process. If it is not supported, the terminal device cannot select the current cell to provide services and needs to search the network again until the terminal device is registered to the network that supports IMS. Through the above-mentioned network selection method, the terminal device can determine whether the network supports IMS only after registering with the core network device. The network selection time is longer, which affects the voice call performance of the terminal device.

Summary of the invention

This application provides a network selection system and terminal equipment to solve the problem of long network selection time for terminal equipment in the prior art.

In the first aspect, this application provides a network selection system, including: an access network device for broadcasting system messages, the system message carries first information, and the first information is used to indicate whether the core network corresponding to the access network device is Support IMS voice. The terminal device is used to receive system messages and determine whether to select a cell covered by the access network device for registration according to the first information.

In the embodiment of this application, the access network device broadcasts the IMS voice capability of the core network through system messages, so that the terminal device supporting IMS voice can determine whether the current cell supports IMS voice during the network search stage, and select registration without the need It can be judged after registering to the cell. For example, in the network search phase of the terminal device, it can be determined that the core network does not support IMS voice based on the system message broadcast by the access network device, and the network search can be initiated again. Compared with the prior art, the terminal device can know that the core network does not support IMS voice until it is registered to the core network. The embodiment of the present application can reduce network selection time, thereby improving the voice call performance of the terminal device.

In a possible design, the first information is determined according to the IMS voice bearer capability of the access network device, and the IMS voice bearer capability of the access network device refers to whether the access network device supports the establishment of an IMS voice bearer. In the above design, the access network device determines the first information based on its own IMS voice bearer capability, so that the terminal device can be instructed to re-initiate network search when it does not support the establishment of the IMS voice bearer, thereby preventing the terminal device from registering to the core network. I know that the network does not support IMS voice, which can shorten the network selection time for terminal equipment.

In a possible design, if the access network device supports the establishment of IMS voice bearer, the first information indicates that the core network corresponding to the access network device supports IMS voice; if the access network device does not support the establishment of IMS voice bearer, then The first information indicates that the core network corresponding to the access network device does not support IMS voice.

In a possible design, the first information is determined according to the IMS voice bearing capability of the access network device and the IMS capability of the core network device. The IMS voice bearing capability of the access network device refers to whether the access network device supports the establishment of IMS For voice bearer, the IMS capability of the core network equipment refers to whether the core network equipment supports communication with IMS. In the above design, the access network device can accurately determine whether the network supports IMS voice based on the IMS voice bearing capacity of the access network device and the IMS capability of the core network device, thereby improving the accuracy of the terminal device network selection.

In a possible design, if the access network device supports the establishment of IMS voice bearer and the core network device supports communication with IMS, the first information indicates that the core network corresponding to the access network device supports IMS voice; The device does not support the establishment of an IMS voice bearer, and/or the core network device does not support communication with IMS, then the first information indicates that the core network corresponding to the access network device does not support IMS voice.

In a possible design, the access network device is also used to obtain the IMS capability information of the core network device. Through the above-mentioned design, the access network device can accurately determine whether the network supports IMS voice according to the IMS voice bearing capability of the access network device and the IMS capability of the core network device.

In a possible design, the network selection system further includes a core network device; the core network device is used to send a first message to the access network device, the first message carrying IMS capability information of the core network device; the access network device, When acquiring the IMS capability information of the core network device, it is specifically used to: receive the first message. In the above design, the core network device can actively inform the access network device of the IMS capability of the core network device, so that the access network device can determine the IMS capability of the network according to the IMS capability of the core network device and the IMS voice bearer capability of the access network device . In addition, the core network device actively informs the access network device of the IMS capability of the core network device, which can make the access network device more accurate when determining the first information, thereby improving the accuracy of the terminal device's network selection.

In a possible design, the network selection system also includes a core network device; the access network device is specifically used for: sending a second message to the core network device when acquiring the IMS capability information of the core network device. To request to obtain the IMS capability information of the core network device; the core network device is used to receive the second message and send a third message to the access network device, the third message carries the IMS capability information of the core network device; the access network device, It is also used to receive the third message sent by the core network device. In the above design, the access network equipment actively queries the IMS capabilities of the core network equipment, thereby determining the network composed of the core network equipment and the access network equipment according to the IMS capabilities of the core network equipment and the IMS voice bearing capacity of the access network equipment IMS capabilities. In addition, by actively querying the IMS capability of the core network device by the access network device, the access network device can be more accurate when determining the first information, thereby improving the accuracy of the terminal device's network selection.

In a possible design, the terminal device, when determining whether to select a cell covered by the access network device for registration according to the first information, is specifically used for: if the terminal device is a voice-centric IMS terminal, and the first information Indicate that the core network corresponding to the access network device does not support IMS voice, and the cell covered by the access network device is not selected for registration. Through the above design, after the voice-centric IMS terminal discovers that the network does not support IMS voice during the network search stage, it can not select the cell covered by the access network device for registration, thus avoiding the terminal device from knowing the network after registering to the core network Does not support IMS voice, which can shorten the network selection time for terminal equipment.

In a possible design, the terminal device, when determining whether to select a cell covered by the access network device for registration according to the first information, is specifically used for: if the terminal device is a voice-centric IMS terminal, and the first information Instruct the core network corresponding to the access network device to support IMS voice, then select the cell covered by the access network device for registration. Through the above design, after the voice-centric IMS terminal discovers that the network supports IMS voice in the network search stage, it can select the cell covered by the access network device for registration.

In a possible design, the system message is a system information block 1 (system information blocks 1, SIB1) message.

In a possible design, the system message includes a first field, and the first field is used to carry the first information.

In a second aspect, this application provides a terminal device, including: a transceiver, configured to receive a system message sent by an access network device, the system message carries first information, and the first information is used to indicate the corresponding Whether the core network supports IMS; the processor is configured to determine whether to select a cell covered by the access network device for registration according to the first information.

In the embodiment of this application, the access network equipment broadcasts the IMS voice capability of the network through system messages, so that the terminal equipment that supports IMS voice can determine whether the current cell supports IMS voice during the network search stage, and choose to register without waiting It can be judged after registering to the cell. For example, in the network search phase of the terminal device, it can be determined that the core network does not support IMS voice based on the system message broadcast by the access network device, so that the network search can be initiated again. Compared with the prior art, the terminal device can know that the network does not support IMS voice until it is registered to the core network. The embodiment of the present application can reduce the network selection time, thereby improving the voice call performance of the terminal device.

In a possible design, the processor is specifically configured to: if the terminal device is a voice-centric IMS terminal, and the first information indicates that the core network corresponding to the access network device does not support IMS, then it does not choose to access The cell covered by the network equipment is registered. Through the above design, after the voice-centric IMS terminal discovers that the network does not support IMS voice during the network search stage, it can not select the cell covered by the access network device for registration, thus avoiding the terminal device from knowing the network after registering to the core network Does not support IMS voice, which can shorten the network selection time for terminal equipment.

In a possible design, the processor is specifically configured to: if the terminal device is a voice-centric IMS terminal, and the first information indicates that the core network corresponding to the access network device supports IMS, select the access network device Register the covered cell. Through the above design, after the voice-centric IMS terminal discovers that the network supports IMS voice in the network search stage, it can select the cell covered by the access network device for registration.

In a possible design, the first information is determined by the access network device according to the IMS voice bearer capability of the access network device, and the IMS voice bearer capability of the access network device refers to whether the access network device supports the establishment of an IMS voice bearer. In the above design, the access network device determines the first information based on its own IMS voice bearer capability, so that the terminal device can be instructed to re-initiate network search when it does not support the establishment of the IMS voice bearer, thereby preventing the terminal device from registering to the core network. I know that the network does not support IMS voice, which can shorten the network selection time for terminal equipment.

In a possible design, the first information is determined by the access network device according to the IMS voice bearing capability of the access network device and the IMS capability of the core network device, and the IMS voice bearing capability of the access network device refers to the access network device Whether to support the establishment of IMS voice bearer, the IMS capability of the core network equipment refers to whether the core network equipment supports communication with IMS. In the above design, the access network device can accurately determine whether the network supports IMS voice based on the IMS voice bearing capacity of the access network device and the IMS capability of the core network device, thereby improving the accuracy of the terminal device network selection.

In one possible design, the system message is a SIB1 message.

In a third aspect, this application provides a network selection method. The method includes: an access network device broadcasts a system message, the system message carries first information, and the first information is used to indicate whether the core network corresponding to the access network device supports IMS voice.

In the embodiment of this application, the access network equipment broadcasts the IMS voice capability of the network through system messages, so that the terminal equipment that supports IMS voice can determine whether the current cell supports IMS voice during the network search stage, and choose to register without waiting It can be judged after registering to the cell. For example, in the network search phase of the terminal device, it can be determined that the network does not support IMS voice based on the system message broadcast by the access network device, so that the network search can be initiated again. Compared with the prior art, the terminal device can know that the network does not support IMS voice until it is registered to the core network. The embodiment of the present application can reduce the network selection time, thereby improving the voice call performance of the terminal device.

In a possible design, the access network equipment can also obtain the IMS capability information of the core network equipment. Through the above-mentioned design, the access network device can accurately determine whether the network supports IMS voice according to the IMS voice bearing capability of the access network device and the IMS capability of the core network device.

In a possible design, the access network device may receive the first message sent by the core network device when acquiring the IMS capability information of the core network device, and the first message carries the IMS capability information of the core network device. In the above design, the core network device can actively inform the access network device of the IMS capability of the core network device, so that the access network device can determine the IMS capability of the network according to the IMS capability of the core network device and the IMS voice bearer capability of the access network device . In addition, the core network device actively informs the access network device of the IMS capability of the core network device, which can make the access network device more accurate when determining the first information, thereby improving the accuracy of the terminal device's network selection.

In a possible design, the access network device may send a second message to the core network device when acquiring the IMS capability information of the core network device, and the second message is used to request to obtain the IMS capability information of the core network device, and A third message sent by the core network device is received, where the third message carries the IMS capability information of the core network device. In the above design, the access network equipment actively queries the IMS capabilities of the core network equipment, thereby determining the network composed of the core network equipment and the access network equipment according to the IMS capabilities of the core network equipment and the IMS voice bearing capacity of the access network equipment IMS capabilities. In addition, by actively querying the IMS capability of the core network device by the access network device, the access network device can be more accurate when determining the first information, thereby improving the accuracy of the terminal device's network selection.

In a fourth aspect, this application provides a network selection method. The method includes: a terminal device receives a system message sent by an access network device, the system message carries first information, and the first information is used to indicate the corresponding Whether the core network supports IMS. The terminal device determines whether to select a cell covered by the access network device for registration according to the first information.

In a possible design, if the terminal device is a voice-centric IMS terminal, and the first information indicates that the core network corresponding to the access network device does not support IMS, the terminal device does not select the cell covered by the access network device Sign up. Through the above design, after the voice-centric IMS terminal discovers that the network does not support IMS voice during the network search stage, it can not select the cell covered by the access network device for registration, thus avoiding the terminal device from knowing the network after registering to the core network Does not support IMS voice, which can shorten the network selection time for terminal equipment.

In a possible design, if the terminal device is a voice-centric IMS terminal, and the first information indicates that the core network corresponding to the access network device supports IMS, the terminal device selects the cell covered by the access network device for registration . Through the above design, after the voice-centric IMS terminal discovers that the network supports IMS voice in the network search stage, it can select the cell covered by the access network device for registration.

In one possible design, the system message is a SIB1 message.

In a fifth aspect, the present application provides a network selection device, which can be a device used in a communication system, or a chip or a chip set in a device used in a communication system, where the device used in a communication system can be It is an access network device or terminal device. The device may include a processing unit and a transceiving unit. When the device is a device used in a communication system, the processing unit may be a processor, and the transceiving unit may be a transceiver; the device may also include a storage unit, and the storage unit may be a memory; the storage unit is used to store instructions , The processing unit executes the instructions stored in the storage unit, so that the access network device executes the corresponding function in the third aspect, or the terminal device executes the corresponding function in the fourth aspect. When the device is a chip or chipset in an access network device, the processing unit may be a processor, and the transceiver unit may be an input/output interface, a pin or a circuit, etc.; the processing unit executes instructions stored in the storage unit , So that the access network device performs the corresponding function in the foregoing third aspect, or the terminal device performs the corresponding function in the foregoing fourth aspect. The storage unit may be a storage unit (for example, register, cache, etc.) in the chip or chipset, or a storage unit (for example, read-only memory) located outside the chip or chipset in a device used in a communication system. , Random access memory, etc.).

In a sixth aspect, the present application also provides a computer-readable storage medium having instructions stored in the computer-readable storage medium, which when executed, cause the methods described in the foregoing aspects to be executed.

In a seventh aspect, the present application also provides a computer program product including instructions, which, when run, causes the methods described in the foregoing aspects to be executed.

In an eighth aspect, the present application provides a chip including a processor and a communication interface, and the communication interface is used to receive code instructions and transmit them to the processor. The processor is configured to invoke the code instructions transmitted by the communication interface to execute the methods described in the foregoing aspects.

Description of the drawings

Figure 1 is a flow chart of the architecture of a communication system provided by this application;

Figure 2 is a schematic flow chart of a network selection method provided by this application;

Figure 3A is a schematic diagram of a network selection process provided by this application;

Figure 3B is a schematic diagram of another network selection process provided by this application;

Figure 3C is a schematic diagram of another network selection process provided by this application;

FIG. 4 is a schematic structural diagram of a communication device provided by this application;

Figure 5 is a schematic structural diagram of an access network device provided by this application;

FIG. 6 is a schematic structural diagram of a terminal device provided by this application.

Detailed ways

In order to make the objectives, technical solutions, and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings.

The network selection method provided in this application can be applied to various communication systems, for example, it can be a long term evolution (LTE), a fifth generation (5G) communication system, or a hybrid architecture of LTE and 5G. , It can also be a 5G new radio (NR) system, and a new communication system (for example, 6G or other networks) that will appear in the future communication development. As long as the IMS is adopted as the voice solution in the communication system, the network selection method provided in the embodiment of the present application can be adopted.

The terminal involved in the embodiments of the present application, also referred to as user equipment (UE), may be a device that provides voice and/or data connectivity to users, for example, a handheld device with a wireless connection function , Car equipment, etc. The terminal can also be other processing equipment connected to the wireless modem. The terminal can communicate with one or more core networks through a radio access network (RAN). The terminal may also be called a wireless terminal, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, an access point, Remote terminal (remote terminal), access terminal (access terminal), user terminal (user terminal), user agent (user agent), user equipment (user device), or user equipment (user equipment), etc. The terminal device can be a mobile terminal, such as a mobile phone (or called a "cellular" phone) and a computer with a mobile terminal. For example, it can be a portable, pocket-sized, handheld, built-in computer or vehicle-mounted mobile device, which is compatible with wireless The access network exchanges language and/or data. For example, the terminal device can also be a personal communication service (PCS) phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (personal digital assistant, PDA), and other equipment. Common terminal devices include, for example: mobile phones, tablet computers, laptops, handheld computers, mobile internet devices (MID), wearable devices, such as smart watches, smart bracelets, pedometers, etc., but this application is implemented Examples are not limited to this.

The access network equipment involved in the embodiments of this application may be an evolved Node B (e-NodeB, eNB or e-NodeB) in LTE, or a new radio controller (NR controller), which can be It is the gNode B (gNB) in the 5G system, it can be a centralized unit, it can be a new wireless base station, it can be a remote radio module, it can be a micro base station, it can be a relay, it can be A distributed unit (distributed unit) may be a reception point (transmission reception point, TRP) or transmission point (transmission point, TP) or any other wireless access device, but the embodiment of the application is not limited thereto. The access network equipment can cover one or more cells.

Generally, there may be multiple access network devices near the terminal equipment. One access network device can be connected to one core network device or multiple core network devices. For example, in a shared network scenario, one access network device can connect to multiple core network devices. The access network equipment is shared by multiple operators. The core network equipment connected to the access network equipment independently provides services for the operators. For example, one access network equipment connects to two core network equipment. Each core network device independently provides services for two operators, and the access network device is shared by the two operators. In a non-shared network scenario, an access network device can be connected to a core network device, and the access network device independently provides services for an operator. The access network equipment may or may not support IMS, and the core network equipment may or may not support IMS. The terminal device can be connected to the access network device through an air interface message, and the access network device can be connected to the core network device through a wire.

For example, as shown in Figure 1, there are two access network equipment near the terminal equipment, namely access network equipment 1 and access network equipment 2. Access network equipment 1 covers cell 1, and access network equipment 2 covers cell 2. And, the access network device 1 is connected to the core network device 1, the access network device 2 is connected to the core network device 2 and the core network device 3, and the core network device 2 is connected to the IP multimedia subsystem (IMS). It should be understood that Figure 1 is only an exemplary illustration, and does not specifically limit the number of terminal equipment, access network equipment, core network equipment, and the connection relationship between core network equipment and IMS included in the communication system. In addition, the figure The communication system shown in 1 may also include other devices, which are not shown here.

At present, when voice centric IMS terminal equipment is used for network selection, the network is first searched. After the network search is completed, the cell that meets the conditions is selected for registration, that is, a registration request is sent to the core network device. The terminal device sends a registration reception message, and the registration reception message carries indication information for indicating whether the network supports IMS. The network may include access network equipment and core network equipment. If both the access network equipment and the core network equipment support IMS, the network supports IMS; otherwise, the network does not support IMS. Therefore, after receiving the registration reception message, the terminal device can determine whether the network supports IMS according to the indication information carried in the registration reception message, and if so, the terminal device initiates the IMS registration process. If it is not supported, the terminal device cannot select the current cell to provide services and needs to search the network again until the terminal device is registered to the network that supports IMS. Through the above-mentioned network selection method, the terminal device can determine whether the network supports IMS only after registering with the core network device. The network selection time is longer, which affects the voice call performance of the terminal device.

Based on this, the embodiments of the present application provide a network selection method, device, and system. In the embodiment of this application, the access network device judges whether it supports IMS voice data radio bearer (DRB) or whether the core network device supports IMS, and broadcasts by carrying the first information of whether it supports IMS voice capability in the system message Network IMS capabilities (for example, a new capability field ims-VoiceSupport is added to the system information blocks1 (SIB1) message, so that terminal devices that support IMS voice can determine whether the current cell supports IMS voice during the network search stage, and Choose to register without waiting for the registration to the cell to judge. Among them, the method and device described in the embodiments of the present application are based on the same concept. Since the method and the device have similar principles for solving problems, the implementation of the device and the method can be referred to each other, and the repetition will not be repeated.

The multiple involved in this application refers to two or more. The at least one involved in this application refers to one or more than one, that is, one, two, three or more.

In addition, it should be understood that in the description of this application, words such as “first” and “second” are only used for the purpose of distinguishing description, and cannot be understood as indicating or implying relative importance, nor can it be understood as indicating Or imply the order.

Example one:

Refer to Fig. 2, which is a flowchart of a network selection method provided in an embodiment of this application. The method can be applied to the communication system shown in FIG. 1, and the method includes:

S201: The access network device broadcasts a system message, the system message carries first information, and the first information is used to indicate whether the core network corresponding to the access network device supports IMS voice. That is, the first information may be IMS voice capability information of the core network corresponding to the access network device, and is used to characterize the IMS voice capability of the network.

In an exemplary description, the first information may be determined according to the IMS voice bearer capability set by the access network. Among them, the IMS voice bearer capability of the access network device refers to whether the access network device supports the establishment of an IMS voice bearer.

In specific implementation, the access network device may consider that the core network corresponding to the access network device supports IMS voice when it supports the establishment of IMS voice bearer (that is, the first information indicates that the core network corresponding to the access network device supports IMS voice), When it does not support the establishment of IMS voice bearer, it is considered that the core network corresponding to the access network device supports IMS voice (that is, the first information indicates that the core network corresponding to the access network device supports IMS voice).

For example, in a non-shared network scenario, taking the access network device 1 shown in FIG. 1 as an example, the access network device 1 can default to the core network device 1 to support communication with IMS, where the access network device 1, the core network device 1 Provide services for the first network. The access network device 1 considers that the first network supports IMS voice when it supports the establishment of IMS voice bearer, that is, the first information of the first network indicates that the first network supports IMS voice, or when it does not support the establishment of IMS voice bearer. A network does not support IMS voice, that is, the first information of the first network indicates that the first network does not support IMS voice.

Or in a shared network scenario, the access network device can consider that all core network devices connected to the access network device support communication with IMS, and determine the first information according to its own IMS voice bearer capability, as shown in Figure 1 Take network access device 2 as an example, access network device 2 can default to core network device 2 and core network device 3 supporting communication with IMS. Among them, core network device 2 provides services for the second network, and core network device 3 is the third network. To provide services, the access network device 2 can provide services for the second network and the third network. When the access network device 2 supports the establishment of an IMS voice bearer, it considers that both the second network and the third network support IMS voice, that is, the first information of the second network and the first information of the third network both indicate that the network supports IMS voice. Or, when it does not support the establishment of IMS voice bearer, it is considered that the second network and the third network do not support IMS voice, that is, the first information of the second network and the first information of the third network both indicate that the network does not support IMS voice.

In another exemplary description, the first information may also be determined according to the IMS voice carrying capability of the access network device and the IMS capability of the core network device. The IMS capability of the core network device refers to whether the core network device supports communication with the IMS.

In specific implementation, the access network device can consider that the network supports IMS voice when it supports the establishment of IMS voice bearer and the core network device supports communication with IMS (that is, the first information indicates that the network supports IMS voice), and vice versa. (That is, the first information indicates that the network supports IMS voice).

For example, in a non-shared network scenario, taking the access network device 1 shown in Figure 1 as an example, the access network device 1 is connected to the core network device 1, where the access network device 1 and the core network device 1 are the first The network provides services. The access network device 1 may consider that the first network supports IMS voice when the core network device 1 supports communication with IMS and the access network device 1 supports the establishment of IMS voice bearer, that is, the first first information indicates that the first network supports IMS voice . Otherwise, it is considered that the first network does not support IMS voice, that is, the first information of the first network indicates that the first network does not support IMS voice.

Or in a shared network scenario, taking the access network device 2 shown in Figure 1 as an example, the access network device 2 is connected to the core network device 2 and the core network device 3, where the core network device 2 provides services for the second network , The core network device 3 provides services for the third network, and the access network device 2 provides services for the second network and the third network. The access network device 2 may consider that the second network supports IMS voice when the core network device 2 supports communication with IMS and the access network device 2 supports the establishment of IMS voice bearer, that is, the first information of the second network indicates that the second network supports IMS. voice. Otherwise, it is considered that the second network does not support IMS voice, that is, the first information of the second network indicates that the second network does not support IMS voice.

In the same way, the access network device 2 can consider that the third network supports IMS voice when the core network device 3 supports communication with IMS and the access network device 2 supports the establishment of IMS voice bearer, that is, the first information of the third network indicates the third network. The network supports IMS voice. Otherwise, it is considered that the third network does not support IMS voice, that is, the first information of the third network indicates that the third network does not support IMS voice.

If the first information is determined according to the IMS voice bearer capability of the access network device and the IMS capability of the core network device, the access network device may also obtain the IMS capability of the core network device before broadcasting the system message.

In some embodiments, the access network device may obtain the IMS capability of the core network device in the following manner: the core network device sends the first message to the access network device. The first message carries the IMS capability information of the core network device. Therefore, the access network device obtains the IMS capability information of the core network device according to the first message after receiving the first message sent by the core network device.

Exemplarily, the first message may be an NG application protocol (NG-AP) message, which is used to indicate the IMS capability of the core network device.

In this method, the core network device can actively inform the access network device of the IMS capability of the core network device, so that the access network device can determine the IMS capability of the network according to the IMS capability of the core network device and the IMS voice bearer capability of the access network device . In addition, the core network device actively informs the access network device of the IMS capability of the core network device, which can make the access network device more accurate when determining the first information, thereby improving the accuracy of the terminal device's network selection.

In other embodiments, the access network device may also obtain the IMS capability of the core network device in the following manner: the access network device sends a second message to the core network device, and the second message is used to request to obtain the IMS capability of the core network device information. After receiving the second message, the core network device sends a third message to the access network device, where the third message carries the IMS capability information of the core network device. Correspondingly, the access network device receives the third message sent by the core network device.

In this method, the access network device actively queries the IMS capability of the core network device, so that the core network device and the access network device can determine the network composed of the core network device and the access network device according to the IMS capability of the core network device and the IMS voice bearing capability of the access network device IMS capabilities. In addition, by actively querying the IMS capability of the core network device by the access network device, the access network device can be more accurate when determining the first information, thereby improving the accuracy of the terminal device's network selection.

In the embodiment of the present application, the system message may be, but is not limited to, an SIB message, a master information block (Master Information Block, MIB) message, and the like.

Further, the system message may be a SIB1 message. Exemplarily, a field can be added to the SIB1 message to carry the first information. For example, the first field is added to the SIB1. The first field is used to indicate whether the network formed by the access network device and the core network device supports IMS voice. .

A possible manifestation of the structure of the SIB1 message can be as follows, where the first field can be ims-VoiceSupport. It should be understood that this is only an exemplary description, and does not describe the structure of the SIB1 message. Naming is specifically limited:

In some embodiments, there may be multiple access network devices near the terminal device, and multiple access network devices may broadcast their own system messages. For example, taking the communication system shown in FIG. 1 as an example, there are two There are two access network devices, namely, access network device 1 and access network device 2. Access network device 1 broadcasts system messages of cell 1, and access network device 2 broadcasts system messages of cell 2.

In addition, one access network device may be connected to multiple core network devices (that is, in a shared scenario), and the access network device may broadcast the first information of different networks through multiple system messages. For example, taking the access network device 2 shown in Figure 1 as an example, the access network device 2 is connected to the core network device 2 and the core network device 3. Among them, the core network device 2 is a public land mobile network 1 (public land mobile network 1). , PLMN1) provides services, and the core network device 3 provides services for PLMN2, and the access network device 2 may carry the first information of PLMN1 and the first information of PLMN2 in different system messages, respectively. Assuming that PLMN1 does not support IMS voice and PLMN2 supports IMS voice, the access network device can indicate that PLMN1 does not support IMS voice through the first field in a system message, and indicate that PLMN2 supports PLMN2 through the first field in another system message IMS voice.

S202: The terminal device determines whether to select a cell covered by the access network device for registration according to the IMS voice bearer capability information of the access network device.

In some embodiments, if the terminal device is a voice-centric IMS terminal (such as a mobile phone, etc.), the terminal device may preferentially select a network supporting IMS voice (voice) for registration. Therefore, the terminal device may not select a cell covered by the access network device for registration when the first information indicates that the network does not support IMS voice. The terminal device may select a cell covered by the access network device for registration when the first information indicates that the network supports IMS voice.

For example, taking the communication system shown in FIG. 1 as an example, suppose that the first information in the system message broadcast by the access network device 1 indicates that the network does not support IMS voice, that is, the core network device 1 does not support communication with IMS and/or the access network If device 1 does not support the establishment of IMS voice bearer, the voice-centric IMS terminal device does not select the cell covered by the access network device 1 for registration, but re-searches the network and receives the system message broadcast by the access network device 2. , And the first information in the system message broadcast by the access network device 2 indicates that the first network supports IMS voice, that is, the core network device 2 supports communication with IMS and the access network device 2 supports the establishment of IMS voice bearers, with voicecentric IMS terminals After receiving the system message broadcast by the access network device 2, the device can select the cell 2 covered by the access network device 2 for registration.

Compared with the prior art, the terminal device can only obtain whether the network supports IMS voice after registering with the core network device. For example, in the method shown in FIG. 2, the terminal device only knows the core network device 1 and the core network device 1 after registering with the core network device 1. The network formed by the access network device 1 does not support IMS voice. In the embodiment of the application, the terminal device can know that the network formed by the core network device 1 and the access network device 1 is not supported after receiving the system message sent by the access network device 1. Support IMS voice, which can reduce the network selection time of the terminal.

In other embodiments, if the terminal device is not a voice-centric IMS terminal, for example, the terminal device is a data-centric IMS terminal (such as a data card), or the terminal device does not support IMS, etc., the terminal device It is not necessary to determine whether the network formed by the access network device and the core network device supports IMS voice, or when it is determined that the network does not support IMS voice, the cell covered by the access network device is still selected for registration.

Further, if the terminal device determines to select a cell covered by the access network device for registration, the terminal device may send a registration request to the core network. Thus, the core network registers the terminal device. Among them, the core network can be different operators, such as Verizon, AT&T, T-Mobile, Sprint, etc.

The registration request is named differently under each access standard. For example, in LTE, the registration request is named Attach Request. In NR, the registration request is named Registeration Request. For the convenience of description, in the embodiments of this application, the message used to request the registration of the terminal device to the core network is collectively referred to as a registration request. In specific implementations, the message used to request the registration of the terminal device to the core network may be named as other Name, such as XX. It should be understood that if the XX can also implement the functions implemented by the registration request in the embodiment of the application, XX can also be understood as the registration request in the embodiment of the application.

After completing the registration process, the core network may reply to the terminal device with a registration reception message. The registration reception message may carry second information used to characterize the IMS voice capability of the network, and the second information is determined by the core network device. Therefore, the terminal device can determine whether to re-initiate a network search based on the second information.

In specific implementation, if the second information indicates that the network supports IMS voice, the terminal device initiates a registration process to the IMS. If the second information indicates that the network does not support IMS voice, the terminal device can re-initiate network search, that is, perform network selection again, until the terminal device is registered with the IMS.

The naming of the registration reception message is different under each access standard. For example, in LTE, the registration reception message is named Attach Accept. In NR, the registration receiving message is named Registration Accept. For the convenience of description, in the embodiments of the present application, the message used to notify the terminal device of successful registration is collectively referred to as the registration received message. In specific implementation, the message used to notify the terminal device of successful registration may be named other names, such as XX. It should be understood that if the XX can also implement the functions implemented by the registration reception message in the embodiment of this application, XX can also be understood as the registration reception message in the embodiment of this application.

In order to better understand the embodiments of the present application, the following describes the network selection process of the terminal device in detail in combination with specific application scenarios. Taking the communication system shown in FIG. 1 as an example, it is assumed that the core network device 1 provides services for the first PLMN, and the core network device 1 supports communication with IMS, and the access network device 1 does not support the establishment of an IMS voice bearer. The core network device 2 provides services for the second PLMN, and the core network device 2 supports communication with IMS, and the access network device 2 supports the establishment of an IMS voice bearer.

A network selection process for voice-centric IMS terminal equipment can be as follows, as shown in Figure 3A:

S301: The terminal device initiates a network search process, and receives a system message broadcast by the access network device 1. The system message carries first information of the first PLMN, and the first information is used to indicate that the first PLMN does not support IMS voice.

S302: The terminal device re-initiates the network search process, and receives the system message broadcast by the access network device 2. The system message carries the first information of the second PLMN, and the first information is used to indicate that the second PLMN supports IMS voice.

S303: The terminal device accesses the access network device 2.

S304: The terminal device sends a registration request message (such as Attach Request or Registeration Request) to the core network device 2.

S305: After completing the registration process, the core network device 2 replies to the terminal device with a registration reception message (such as Attach Accept or Registration Accept).

S306: The terminal device sends a registration request to the IMS, where the registration request is used to request to register the terminal device to the IMS.

S307: The IMS sends a registration response to the terminal device, where the registration response is used to notify the terminal device that the terminal device has successfully registered with the IMS.

Another network selection process for voice-centric IMS terminal equipment can be as follows, as shown in Figure 3B:

S401a: The core network device 1 sends auxiliary information to the access network device 1, where the auxiliary information may carry the IMS capability information of the core network device 1. S402 is executed.

S401b: The core network device 2 sends auxiliary information to the access network device 2, where the auxiliary information may carry the IMS capability information of the core network device 2. S402 is executed.

It should be noted that there is no strict sequence between step S401a and step S401b. Step S401a can be executed first and then step S401b can be executed, or step S401b can be executed first and then step S401a can be executed, or steps S401a and S401b can be executed simultaneously. No specific restrictions.

For steps S402 to S408, please refer to steps S301 to S307 for details, and the repetition will not be repeated.

Another network selection process for voice-centric IMS terminal equipment can be as follows, as shown in Figure 3C:

S501a: The access network device 1 sends a query message to the core network device 1, where the query message is used to query the IMS capability of the core network device 1. Step S502a is executed.

S502a: The core network device 1 sends a response message to the access network device 1, where the response message may carry the IMS capability information of the core network device 1. Perform S503.

S501b: The access network device 2 sends a query message to the core network device 2, where the query message is used to query the IMS capability of the core network device 2. Step S502b is executed.

S502b: The core network device 2 sends a response message to the access network device 2, where the response message may carry the IMS capability information of the core network device 2. Perform S503.

It should be noted that there is no strict sequence between steps (S501a-S502a) and steps (S501b-S502b). You can perform steps (S501a-S502a) first and then steps (S501b-S502b), or you can perform steps (S501b) first. Steps (S501a-S502a) are executed after -S502b), or steps (S501a-S502a) and (S501b-S502b) can also be executed at the same time, which is not specifically limited here.

For details of steps S503 to S509, please refer to steps S301 to S307, and the repetition will not be repeated.

In the embodiment of this application, the access network device broadcasts the network IMS voice capability in the system message, so that the terminal device that supports IMS voice can determine whether the current cell supports IMS voice during the network search stage, and choose to register without waiting It can be judged after registering to the cell. For example, the terminal device may determine that the first PLMN does not support IMS voice according to the system message broadcast by the access network device 1 during the network search phase, so that the network search can be initiated again. Compared with the prior art, the terminal device can know that the first PLMN does not support IMS voice until it is registered to the first PLMN. The embodiment of the present application can reduce the network selection time, thereby improving the voice call performance of the terminal device.

In addition, in the embodiment of the present application, the network IMS voice capability information determined by the core network device is carried in the registration reception message sent by the core network, so that the terminal device twice determines whether the network supports IMS voice after registering to the core network, which can avoid The terminal device is registered to the core network device that does not support IMS, which can further improve accuracy.

Based on the same inventive concept as the method embodiment, the embodiment of the present application provides a communication device. The structure of the communication device may be as shown in FIG. 4, including a transceiver unit 401 and a processing unit 402.

In a specific implementation manner, the communication device may be specifically used to implement the method executed by the access network device in the embodiments shown in Figs. 2 to 3C. The device may be the access network device itself or the access network device. A chip or chipset or part of a chip used to perform related method functions in a device. Among them, the transceiver unit 401 is used to transmit and receive data. The processing unit is configured to broadcast a system message through the transceiver unit 401, the system message carries first information, and the first information is used to indicate whether the core network corresponding to the access network device supports IMS voice.

Exemplarily, the first information may be determined according to the IMS voice bearer capability of the access network device, and the IMS voice bearer capability of the access network device refers to whether the access network device supports the establishment of an IMS voice bearer.

Specifically, if the access network device supports the establishment of IMS voice bearer, the first information indicates that the core network corresponding to the access network device supports IMS voice; if the access network device does not support the establishment of IMS voice bearer, the first information indicates The core network corresponding to the access network device does not support IMS voice.

Exemplarily, the first information may also be determined according to the IMS voice bearer capability of the access network device and the IMS capability of the core network device. The IMS voice bearer capability of the access network device refers to whether the access network device supports the establishment of an IMS voice bearer , IMS capability of core network equipment refers to whether the core network equipment supports communication with IMS.

Specifically, if the access network device supports the establishment of IMS voice bearer, and the core network device supports communication with IMS, the first information indicates that the core network corresponding to the access network device supports IMS voice; if the access network device does not support establishment IMS voice bearer, and/or, the core network device does not support communication with IMS, then the first information indicates that the core network corresponding to the access network device does not support IMS voice.

The processing unit 402 may also be used to obtain IMS capability information of the core network device.

The processing unit 402, when acquiring the IMS capability information of the core network device, may be specifically configured to receive the first message sent by the core network device through the transceiver unit 401, where the first message carries the IMS capability information of the core network device.

The processing unit 402, when acquiring the IMS capability information of the core network device, may be specifically configured to: send a second message to the core network device through the transceiver unit 401, the second message is used to request the acquisition of the IMS capability information of the core network device, and pass The transceiver unit 401 receives a third message sent by the core network device, where the third message carries the IMS capability information of the core network device.

Exemplarily, the system message may be a SIB1 message.

Exemplarily, the system message may include a first field, and the first field is used to carry the first information.

In a specific implementation manner, the communication device can be specifically used to implement the method executed by the terminal device in the embodiments of Figs. 2 to 3C. The device can be for the device itself, or for the chip or chip in the device. A part of a group or chip used to perform related method functions. The transceiver unit 401 is configured to receive a system message sent by an access network device, the system message carries first information, and the first information is used to indicate whether the core network corresponding to the access network device supports IMS. The processing unit 402 is configured to determine whether to select a cell covered by the access network device for registration according to the first information.

The processing unit 402 may be specifically configured to: if the terminal device is a voice-centric IMS terminal, and the first information indicates that the core network corresponding to the access network device does not support IMS, then the cell covered by the access network device is not selected to perform registered.

The processing unit 402 may be specifically configured to: if the terminal device is a voice-centric IMS terminal, and the first information indicates that the core network corresponding to the access network device supports IMS, select a cell covered by the access network device for registration.

Exemplarily, the first information may be determined by the access network device according to the IMS voice bearer capability of the access network device, and the IMS voice bearer capability of the access network device refers to whether the access network device supports the establishment of an IMS voice bearer. In the above design, the access network device determines the first information based on its own IMS voice bearer capability, so that the terminal device can be instructed to re-initiate network search when it does not support the establishment of the IMS voice bearer, thereby preventing the terminal device from registering to the core network. I know that the network does not support IMS voice, which can shorten the network selection time for terminal equipment.

Specifically, if the access network device supports the establishment of an IMS voice bearer, the first information indicates that the core network corresponding to the access network device supports IMS voice; if the access network device does not support the establishment of an IMS voice bearer, the first information indicates that The core network corresponding to the access network device does not support IMS voice.

Exemplarily, the first information may also be determined by the access network device according to the IMS voice bearing capability of the access network device and the IMS capability of the core network device. The IMS voice bearing capability of the access network device refers to whether the access network device supports Establish IMS voice bearer, the IMS capability of the core network equipment refers to whether the core network equipment supports communication with IMS. In the above design, the access network device can accurately determine whether the network supports IMS voice based on the IMS voice bearing capacity of the access network device and the IMS capability of the core network device, thereby improving the accuracy of the terminal device network selection.

Specifically, if the access network device supports the establishment of IMS voice bearer and the core network device supports communication with IMS, the first information indicates that the core network corresponding to the access network device supports IMS voice; if the access network device does not support the establishment of IMS Voice bearer, and/or, the core network device does not support communication with IMS, then the first information indicates that the core network corresponding to the access network device does not support IMS voice.

Exemplarily, the system message is a SIB1 message.

Exemplarily, the system message includes a first field, and the first field is used to carry the first information.

The division of modules in the embodiments of the present application is illustrative, and is only a logical function division. In actual implementation, there may be other division methods. In addition, the functional modules in the various embodiments of the present application may be integrated into one process. In the device, it can also exist alone physically, or two or more modules can be integrated into one module. The above-mentioned integrated modules can be implemented in the form of hardware or software functional modules. It can be understood that the function or implementation of each module in the embodiment of the present application may further refer to the related description of the method embodiment.

Fig. 5 is a schematic structural diagram of a terminal device provided by an embodiment of the present application. The terminal device can be applied to the system shown in FIG. 1 to perform the functions of the terminal device in the foregoing method embodiment. For ease of description, FIG. 5 only shows the main components of the terminal device. As shown in FIG. 5, the terminal device 50 includes a processor, a memory, a control circuit, an antenna, and an input and output device. The processor is mainly used to process the communication protocol and communication data, and to control the entire terminal device, execute the software program, and process the data of the software program, for example, to support the terminal device to perform the actions described in the above method embodiment. The memory is mainly used to store software programs and data. The control circuit is mainly used for the conversion of baseband signals and radio frequency signals and the processing of radio frequency signals. The control circuit and the antenna together can also be called a transceiver, which is mainly used to send and receive radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, and keyboards, are mainly used to receive data input by users and output data to users.

When the terminal device is turned on, the processor can read the software program in the memory, interpret and execute the instructions of the software program, and process the data of the software program. When data needs to be sent wirelessly, the processor performs baseband processing on the data to be sent and outputs the baseband signal to the radio frequency circuit. The radio frequency circuit performs radio frequency processing on the baseband signal and then sends the radio frequency signal to the outside in the form of electromagnetic waves through the antenna. When data is sent to the terminal device, the radio frequency circuit receives the radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor, and the processor converts the baseband signal into data and processes the data.

Those skilled in the art can understand that, for ease of description, FIG. 5 only shows one memory and one processor. In an actual terminal device, there may be multiple processors and multiple memories. The memory may also be referred to as a storage medium or storage device. The memory may be a storage element on the same chip as the processor, that is, an on-chip storage element, or an independent storage element, which is not limited in the embodiment of the present application.

As an optional implementation, the terminal device may include a baseband processor and a central processing unit. The baseband processor is mainly used to process communication protocols and communication data, and the central processing unit is mainly used to control the entire terminal device. , Execute the software program, and process the data of the software program. The processor in FIG. 5 can integrate the functions of the baseband processor and the central processing unit. Those skilled in the art can understand that the baseband processor and the central processing unit can also be independent processors and are interconnected by technologies such as buses. Those skilled in the art can understand that the terminal device may include multiple baseband processors to adapt to different network standards, the terminal device may include multiple central processors to enhance its processing capabilities, and various components of the terminal device may be connected through various buses. The baseband processor can also be expressed as a baseband processing circuit or a baseband processing chip. The central processing unit can also be expressed as a central processing circuit or a central processing chip. The function of processing the communication protocol and communication data can be built in the processor, or can be stored in the memory in the form of a software program, and the processor executes the software program to realize the baseband processing function.

In the embodiment of the present application, the antenna and the control circuit with the transceiving function can be regarded as the transceiving unit 501 of the terminal device 50, for example, for supporting the terminal device to perform the receiving function and the transmitting function. The processor 502 with processing functions is regarded as the processing unit of the terminal device. As shown in FIG. 5, the terminal device 50 includes a transceiver unit 501 and a processor 502. The transceiver unit may also be referred to as a transceiver, a transceiver, a transceiver, and so on. Optionally, the device for implementing the receiving function in the transceiver unit 501 can be regarded as the receiving unit, and the device for implementing the sending function in the transceiver unit 501 can be regarded as the sending unit, that is, the transceiver unit 501 includes a receiving unit and a sending unit. The receiving unit may also be called a receiver, an input port, a receiving circuit, etc., and the sending unit may be called a transmitter, a transmitter, or a transmitting circuit, etc.

The processor 502 may be used to execute instructions stored in the memory to control the transceiver unit 501 to receive signals and/or send signals, so as to complete the functions of the terminal device in the foregoing method embodiment. The processor 502 also includes an interface for implementing signal input/output functions. As an implementation manner, the function of the transceiver unit 501 may be implemented by a transceiver circuit or a dedicated chip for transceiver.

Fig. 6 is a schematic structural diagram of an access network device provided by an embodiment of the present application, for example, it may be a schematic structural diagram of a base station. As shown in FIG. 6, the base station can be applied to the system shown in FIG. 1 to perform the functions of the access network device in the foregoing method embodiment. The base station 60 may include one or more DU 601 and one or more CU 602. The DU 601 may include at least one antenna 6011, at least one radio frequency unit 6012, at least one processor 6013, and at least one memory 6014. The DU 601 part is mainly used for the transmission and reception of radio frequency signals, the conversion of radio frequency signals and baseband signals, and part of baseband processing. The CU602 may include at least one processor 6022 and at least one memory 6021. CU602 and DU601 can communicate through interfaces, where the control plan interface can be Fs-C, such as F1-C, and the user plane (User Plan) interface can be Fs-U, such as F1-U.

The CU 602 part is mainly used for baseband processing, control of the base station, and so on. The DU 601 and the CU 602 may be physically set together or physically separated, that is, a distributed base station. The CU 602 is the control center of the base station, which may also be called a processing unit, and is mainly used to complete baseband processing functions. For example, the CU 602 may be used to control the base station to execute the operation procedure of the access network device in the foregoing method embodiment.

Specifically, the baseband processing on the CU and DU can be divided according to the protocol layer of the wireless network, for example, the packet data convergence protocol (PDCP) layer and the functions of the above protocol layers are set in the CU, the protocol layer below PDCP, For example, functions such as the radio link control (RLC) layer and the media access control (MAC) layer are set in the DU. For another example, CU implements radio resource control (radio resource control, RRC), packet data convergence protocol (packet data convergence protocol, PDCP) layer functions, DU implements radio link control (radio link control, RLC), media access Control (media access control, MAC) and physical (physical, PHY) layer functions.

In addition, optionally, the base station 60 may include one or more radio frequency units (RU), one or more DUs, and one or more CUs. The DU may include at least one processor 6013 and at least one memory 6014, the RU may include at least one antenna 6011 and at least one radio frequency unit 6012, and the CU may include at least one processor 6022 and at least one memory 6021.

In an example, the CU602 can be composed of one or more single boards, and multiple single boards can jointly support a wireless access network with a single access indication (such as a 5G network), or can support wireless access networks of different access standards. Access network (such as LTE network, 5G network or other networks). The memory 6021 and the processor 6022 may serve one or more single boards. In other words, the memory and the processor can be set separately on each board. It can also be that multiple boards share the same memory and processor. In addition, necessary circuits can be provided on each board. The DU601 can be composed of one or more single boards. Multiple single boards can jointly support a wireless access network with a single access indication (such as a 5G network), and can also support wireless access networks with different access standards (such as LTE network, 5G network or other network). The memory 6014 and the processor 6013 may serve one or more boards. In other words, the memory and the processor can be set separately on each board. It can also be that multiple boards share the same memory and processor. In addition, necessary circuits can be provided on each board.

The embodiment of the present application also provides a computer-readable storage medium for storing computer software instructions required to execute the above-mentioned processor, which contains a program required to execute the above-mentioned processor.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented by software, it can be implemented in the form of a computer program product in whole or in part. 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 described in the embodiments of the present application are generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions may 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 may be transmitted from a website, computer, server, or data center. Transmission to another website site, computer, server or data center via wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or a data center integrated with one or more available media. The usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk (SSD)), etc.

This application is described with reference to flowcharts and/or block diagrams of methods, equipment (systems), and computer program products according to this application. It should be understood that each process and/or block in the flowchart and/or block diagram, and the combination of processes and/or blocks in the flowchart and/or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing equipment to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing equipment are generated It is a device that realizes the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.

These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing equipment to work in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including the instruction device. The device implements the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.

These computer program instructions can also be loaded on a computer or other programmable data processing equipment, so that a series of operation steps are executed on the computer or other programmable equipment to produce computer-implemented processing, so as to execute on the computer or other programmable equipment. The instructions provide steps for implementing functions specified in a flow or multiple flows in the flowchart and/or a block or multiple blocks in the block diagram.

Obviously, those skilled in the art can make various changes and modifications to the application without departing from the spirit and scope of the application. In this way, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, this application also intends to include these modifications and variations.

Claims

A network selection system, characterized in that it comprises:

An access network device, configured to broadcast a system message, the system message carrying first information, and the first information is used to indicate whether the core network corresponding to the access network device supports the network protocol multimedia subsystem IMS voice;

The terminal device is configured to receive the system message and determine whether to select a cell covered by the access network device for registration according to the first information.
The system according to claim 1, wherein the first information is determined according to the IMS voice bearing capability of the access network device, and the IMS voice bearing capability of the access network device refers to the access Whether the network equipment supports the establishment of IMS voice bearer.
The system according to claim 2, wherein if the access network device supports the establishment of IMS voice bearer, the first information indicates that the core network corresponding to the access network device supports IMS voice;

If the access network device does not support the establishment of an IMS voice bearer, the first information indicates that the core network corresponding to the access network device does not support IMS voice.
The system according to claim 1, wherein the first information is determined according to the IMS voice bearing capability of the access network device and the IMS capability of the core network device, and the IMS voice of the access network device The bearer capability refers to whether the access network device supports the establishment of an IMS voice bearer, and the IMS capability of the core network device refers to whether the core network device supports communication with IMS.
The system according to claim 4, wherein if the access network device supports the establishment of an IMS voice bearer, and the core network device supports communication with IMS, the first information indicates that the access network device The corresponding core network supports IMS voice;

If the access network device does not support the establishment of an IMS voice bearer, and/or the core network device does not support communication with IMS, the first information indicates that the core network corresponding to the access network device does not support IMS voice .
The system according to claim 4 or 5, wherein the access network device is further used to obtain IMS capability information of the core network device.
7. The system of claim 6, wherein the network selection system further comprises a core network device;

The core network device is configured to send a first message to the access network device, where the first message carries IMS capability information of the core network device;

The access network device is specifically used to: when acquiring the IMS capability information of the core network device:

Receiving the first message.
7. The system of claim 6, wherein the network selection system further comprises a core network device;

The access network device is specifically used to: when acquiring the IMS capability information of the core network device:

Sending a second message to the core network device, where the second message is used to request to obtain the IMS capability information of the core network device;

The core network device is configured to receive the second message and send a third message to the access network device, the third message carrying IMS capability information of the core network device;

The access network device is further configured to receive the third message sent by the core network device.
The system according to any one of claims 1 to 8, wherein the terminal device, when determining whether to select a cell covered by the access network device for registration according to the first information, is specifically configured to:

If the terminal device is a voice-centric IMS terminal, and the first information indicates that the core network corresponding to the access network device does not support IMS voice, then the cell covered by the access network device is not selected for registration .
The system according to any one of claims 1 to 9, wherein the terminal device, when determining whether to select a cell covered by the access network device for registration according to the first information, is specifically configured to:

If the terminal device is a voice-centric IMS terminal, and the first information indicates that the core network corresponding to the access network device supports IMS voice, a cell covered by the access network device is selected for registration.
The system according to any one of claims 1 to 10, wherein the system message is a system information block 1SIB1 message.
The system according to any one of claims 1 to 11, wherein the system message includes a first field, and the first field is used to carry the first information.
A terminal device, characterized in that it comprises:

A transceiver, configured to receive a system message sent by an access network device, the system message carrying first information, and the first information is used to indicate whether the core network corresponding to the access network device supports the network protocol multimedia subsystem IMS;

The processor is configured to determine whether to select a cell covered by the access network device for registration according to the first information.
The terminal device according to claim 13, wherein the processor is specifically configured to:

If the terminal device is a voice-centric IMS terminal, and the first information indicates that the core network corresponding to the access network device does not support IMS, then the cell covered by the access network device is not selected for registration.
The terminal device according to claim 13, wherein the processor is specifically configured to:

If the terminal device is a voice-centric IMS terminal, and the first information indicates that the core network corresponding to the access network device supports IMS, a cell covered by the access network device is selected for registration.
The terminal device according to any one of claims 13 to 15, wherein the first information is determined by the access network device according to the IMS voice bearing capability of the access network device, and the access The IMS voice bearer capability of a network device refers to whether the access network device supports the establishment of an IMS voice bearer.
The terminal device according to claim 16, wherein if the access network device supports the establishment of IMS voice bearer, the first information indicates that the core network corresponding to the access network device supports IMS voice;

If the access network device does not support the establishment of an IMS voice bearer, the first information indicates that the core network corresponding to the access network device does not support IMS voice.
The terminal device according to any one of claims 13 to 15, wherein the first information is that the access network device is based on the IMS voice bearing capability of the access network device and the IMS capability of the core network device. It is determined that the IMS voice bearer capability of the access network device refers to whether the access network device supports the establishment of an IMS voice bearer, and the IMS capability of the core network device refers to whether the core network device supports communication with the IMS.
The terminal device according to claim 18, wherein if the access network device supports the establishment of an IMS voice bearer, and the core network device supports communication with IMS, the first information indicates that the access network The core network corresponding to the device supports IMS voice;

If the access network device does not support the establishment of an IMS voice bearer, and/or the core network device does not support communication with IMS, the first information indicates that the core network corresponding to the access network device does not support IMS voice .
The terminal device according to any one of claims 13 to 19, wherein the system message is a system information block 1SIB1 message.
The terminal device according to any one of claims 13 to 20, wherein the system message includes a first field, and the first field is used to carry the first information.