CN113812176B

CN113812176B - Network selection system and terminal equipment

Info

Publication number: CN113812176B
Application number: CN201980096323.6A
Authority: CN
Inventors: 钟继磊; 段小嫣
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-05-17
Filing date: 2019-05-17
Publication date: 2023-03-31
Anticipated expiration: 2039-05-17
Also published as: CN113812176A; WO2020232584A1

Abstract

A network selection system and a terminal device are used for solving the problem that the network selection time of the terminal device is long in the prior art. The network selection system comprises: and the access network equipment is used for broadcasting a system message, wherein the system message carries first information, and the first information is used for indicating whether a core network corresponding to the access network equipment supports IMS voice. And the terminal equipment is used for receiving the system message and determining whether to select the cell covered by the access network equipment for registration or not according to the first information.

Description

Network selection system and terminal equipment

Technical Field

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

Background

At present, an Internet Protocol (IP) multimedia subsystem (IMS) is used as a 4G and 5G general voice solution, and therefore, an IMS terminal (such as a mobile phone) with a voice center (voice center) needs to select a cell supporting IMS voice bearer for registration to perform an audio call.

At present, when a terminal device selects a network, a network is first searched, a cell meeting conditions is selected to register after the network search is finished, that is, a registration request is sent to a core network device, and the core network device sends a registration receiving message to the terminal device after a registration process is finished, wherein the registration receiving message carries indication information for indicating whether the IMS is supported. Therefore, after receiving the registration receiving message, the terminal device can determine whether the network supports the IMS according to the indication information carried by the registration receiving message, and if so, the terminal device initiates an IMS registration process. If not, the terminal equipment cannot select the current cell to provide the service, and needs to search the network again until the terminal equipment registers to the network supporting the IMS. By the network selection method, the terminal equipment can determine whether the network supports the IMS or not after registering to the core network equipment, and the network selection time is longer, so that the voice call performance of the terminal equipment is influenced.

Disclosure of Invention

The application provides a network selection system and terminal equipment, which are used for solving the problem that the network selection time of the terminal equipment is long in the prior art.

In a first aspect, the present application provides a network selection system, including: and the access network equipment is used for broadcasting system information, the system information carries first information, and the first information is used for indicating whether a core network corresponding to the access network equipment supports IMS voice. And the terminal equipment is used for receiving the system message and determining whether to select the cell covered by the access network equipment for registration or not according to the first information.

In the embodiment of the application, the access network equipment broadcasts the IMS voice capability of the core network through the system message, so that the terminal equipment supporting the IMS voice can judge whether the current cell supports the IMS voice or not in the network searching stage and select registration without waiting for the registration to the cell. For example, in the network searching stage of the terminal device, it may be determined that the core network does not support IMS voice according to the system message broadcast by the access network device, so that network searching may be initiated again. Compared with the prior art, the terminal equipment can know that the core network does not support the IMS voice after registering to the core network, and the network selection time can be reduced according to the embodiment of the application, so that the voice call performance of the terminal equipment can be improved.

In a possible design, the first information is determined according to an IMS voice bearer capability of the access network device, where the IMS voice bearer capability of the access network device indicates whether the access network device supports establishment of an IMS voice bearer. In the design, the access network equipment determines the first information based on the IMS voice bearing capacity of the access network equipment, so that the terminal equipment can be instructed to restart the network searching when the access network equipment does not support the establishment of the IMS voice bearing, the situation that the terminal equipment knows that the network does not support the IMS voice after registering to a core network can be avoided, and the network selection time of the terminal equipment can be shortened.

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

In a possible design, the first information is determined according to an IMS voice bearer capability of the access network device and an IMS capability of the core network device, where the IMS voice bearer capability of the access network device indicates whether the access network device supports establishing an IMS voice bearer, and the IMS capability of the core network device indicates whether the core network device supports communicating with the IMS. In the above design, the access network device can accurately determine whether the network supports the IMS voice according to the IMS voice carrying capability of the access network device and the IMS capability of the core network device, so that the accuracy of network selection of the terminal device can be improved.

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

In one possible design, the access network device is further configured to: and acquiring IMS capability information of the core network equipment. Through the design, the access network equipment can accurately judge whether the network supports the IMS voice according to the IMS voice bearing capacity of the access network equipment and the IMS capacity of the core network equipment.

In one possible design, the network selection system further includes a core network device; the core network equipment is used for sending a first message to the access network equipment, wherein the first message carries the IMS capability information of the core network equipment; the access network device, when acquiring the IMS capability information of the core network device, is specifically configured to: a first message is received. In the above design, the core network device may actively inform the access network device of the IMS capability of the core network device, so that the access network device may 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. And the core network device actively informs the IMS capability of the core network device to the access network device, so that the access network device can determine the first information more accurately, and the accuracy of network selection of the terminal device is improved.

In one possible design, the network selection system further includes a core network device; the access network device, when acquiring the IMS capability information of the core network device, is specifically configured to: sending a second message to the core network equipment, wherein the second message is used for requesting to acquire IMS capability information of the core network equipment; the core network equipment is used for receiving the second message and sending a third message to the access network equipment, wherein the third message carries the IMS capability information of the core network equipment; and the access network equipment is also used for receiving a third message sent by the core network equipment. In the design, the access network device actively queries the IMS capability of the core network device, so that the IMS capability of a network formed by the core network device and the access network device can be determined according to the IMS capability of the core network device and the IMS voice carrying capability of the access network device. And the access network equipment actively queries the IMS capability of the core network equipment, so that the access network equipment can determine the first information more accurately, and the accuracy of network selection of the terminal equipment is improved.

In a possible design, when determining whether to select a cell covered by the access network device for registration according to the first information, the terminal device is specifically configured to: and if the terminal equipment is an IMS terminal taking voice as a center and the first information indicates that the core network corresponding to the access network equipment does not support IMS voice, not selecting a cell covered by the access network equipment for registration. Through the design, after the IMS terminal taking voice as the center finds that the network does not support IMS voice in the network searching stage, the IMS terminal does not select the cell covered by the access network equipment for registration, so that the terminal equipment can be prevented from knowing that the network does not support IMS voice after registering to the core network, and the network selection time of the terminal equipment can be further shortened.

In a possible design, when determining, according to the first information, whether to select a cell covered by the access network device for registration, the terminal device is specifically configured to: and if the terminal equipment is an IMS terminal taking voice as a center and the first information indicates that the core network corresponding to the access network equipment supports IMS voice, selecting a cell covered by the access network equipment for registration. Through the design, after the IMS terminal taking voice as the center discovers that the network supports IMS voice in the network searching stage, the IMS terminal can select the cell covered by the access network equipment to register.

In one possible design, the system message is a system information block 1 (SIB 1) message.

In one possible design, the system message includes a first field to carry the first information.

In a second aspect, the present application provides a terminal device, including: the system comprises a transceiver and a controller, wherein the transceiver is used for receiving a system message sent by access network equipment, the system message carries first information, and the first information is used for indicating whether a core network corresponding to the access network equipment supports the IMS or not; and the processor is used for determining whether to select a cell covered by the access network equipment for registration according to the first information.

In the embodiment of the application, the access network equipment broadcasts the IMS voice capability of the network through the system message, so that the terminal equipment supporting the IMS voice can judge whether the current cell supports the IMS voice or not in the network searching stage and select registration without waiting for the registration to the cell. For example, in the network searching stage of the terminal device, it may be determined that the core network does not support IMS voice according to the system message broadcast by the access network device, so that network searching may be initiated again. Compared with the prior art, the terminal equipment can know that the network does not support the IMS voice after registering to the core network, and the network selection time can be reduced according to the embodiment of the application, so that the voice call performance of the terminal equipment can be improved.

In one possible design, the processor is specifically configured to: and if the terminal equipment is an IMS terminal taking voice as a center and the first information indicates that the core network corresponding to the access network equipment does not support IMS, the cell covered by the access network equipment is not selected for registration. Through the design, after the IMS terminal taking voice as the center finds that the network does not support IMS voice in the network searching stage, the IMS terminal does not select the cell covered by the access network equipment for registration, so that the terminal equipment can be prevented from knowing that the network does not support IMS voice after registering to the core network, and the network selection time of the terminal equipment can be further shortened.

In one possible design, the processor is specifically configured to: if the terminal equipment is an IMS terminal taking voice as a center and the first information indicates that a core network corresponding to the access network equipment supports IMS, selecting a cell covered by the access network equipment for registration. Through the design, after the IMS terminal taking voice as the center discovers that the network supports IMS voice in the network searching stage, the IMS terminal can select the cell covered by the access network equipment to register.

In a possible design, the first information is determined by the access network device according to an IMS voice bearer capability of the access network device, where the IMS voice bearer capability of the access network device indicates whether the access network device supports establishment of an IMS voice bearer. In the design, the access network equipment determines the first information based on the IMS voice bearing capacity of the access network equipment, so that the terminal equipment can be instructed to restart the network searching when the access network equipment does not support the establishment of the IMS voice bearing, the situation that the terminal equipment knows that the network does not support the IMS voice after registering to a core network can be avoided, and the network selection time of the terminal equipment can be shortened.

In a possible design, the first information is determined by the access network device according to an IMS voice bearer capability of the access network device and an IMS capability of the core network device, where the IMS voice bearer capability of the access network device indicates whether the access network device supports establishment of an IMS voice bearer, and the IMS capability of the core network device indicates whether the core network device supports communication with the IMS. In the above design, the access network device can accurately determine whether the network supports the IMS voice according to the IMS voice carrying capability of the access network device and the IMS capability of the core network device, so as to improve the accuracy of network selection of the terminal device.

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

In a third aspect, the present application provides a network selection method, including: the access network equipment broadcasts a system message, the system message carries first information, and the first information is used for indicating whether a core network corresponding to the access network equipment supports IMS voice.

In the embodiment of the application, the access network equipment broadcasts the IMS voice capability of the network through the system message, so that the terminal equipment supporting the IMS voice can judge whether the current cell supports the IMS voice or not in the network searching stage and select registration without waiting for the registration to the cell. For example, in the network searching stage, the terminal device may determine that the network does not support IMS voice according to the system message broadcast by the access network device, so that network searching may be initiated again. Compared with the prior art, the terminal equipment can know that the network does not support the IMS voice after registering to the core network, and the network selection time can be reduced according to the embodiment of the application, so that the voice call performance of the terminal equipment can be improved.

In a possible design, the first information is determined according to an IMS voice bearer capability of the access network device, where the IMS voice bearer capability of the access network device indicates whether the access network device supports establishment of an IMS voice bearer. In the design, the access network device determines the first information based on the IMS voice bearing capacity of the access network device, so that the terminal device can be instructed to initiate network searching again when the access network device does not support the IMS voice bearing, the terminal device can be prevented from knowing that the network does not support IMS voice after being registered to a core network, and the network selection time of the terminal device can be shortened.

In a possible design, the access network device may further obtain IMS capability information of the core network device. Through the design, the access network equipment can accurately judge whether the network supports the IMS voice according to the IMS voice bearing capacity of the access network equipment and the IMS capacity of the core network equipment.

In a possible design, when acquiring the IMS capability information of the core network device, the access network device may receive a first message sent by the core network device, where the first message carries the IMS capability information of the core network device. In the above design, the core network device may actively inform the access network device of the IMS capability of the core network device, so that the access network device may 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. And the core network device actively informs the IMS capability of the core network device to the access network device, so that the access network device can determine the first information more accurately, and the accuracy of network selection of the terminal device is improved.

In a possible design, when acquiring the IMS capability information of the core network device, the access network device may send a second message to the core network device, where the second message is used to request to acquire the IMS capability information of the core network device, and receive a third message sent by the core network device, where the third message carries the IMS capability information of the core network device. In the design, the access network device actively queries the IMS capability of the core network device, so that the IMS capability of a network formed by the core network device and the access network device can be determined according to the IMS capability of the core network device and the IMS voice carrying capability of the access network device. And the access network equipment actively queries the IMS capability of the core network equipment, so that the access network equipment can determine the first information more accurately, and the accuracy of network selection of the terminal equipment is improved.

In a fourth aspect, the present application provides a network selection method, including: the terminal device receives a system message sent by the access network device, wherein the system message carries first information, and the first information is used for indicating whether a core network corresponding to the access network device supports the IMS. And the terminal equipment determines whether to select a cell covered by the access network equipment for registration or not according to the first information.

In the embodiment of the application, the access network equipment broadcasts the IMS voice capability of the network through the system message, so that the terminal equipment supporting the IMS voice can judge whether the current cell supports the IMS voice or not in the network searching stage and select registration without waiting for the registration to the cell. For example, in the network searching stage, the terminal device may determine that the network does not support IMS voice according to the system message broadcast by the access network device, so that network searching may be initiated again. Compared with the prior art, the terminal equipment can know that the network does not support the IMS voice after being registered in the core network, and the network selection time can be reduced according to the embodiment of the application, so that the voice call performance of the terminal equipment can be improved.

In a possible design, if the terminal device is an IMS terminal using voice as a center 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 a cell covered by the access network device for registration. Through the design, after the IMS terminal taking voice as the center discovers that the network does not support IMS voice in the network searching stage, the IMS terminal does not select the cell covered by the access network equipment for registration, so that the situation that the network does not support IMS voice after the terminal equipment is registered to a core network can be avoided, and the network selection time of the terminal equipment can be further shortened.

In a possible design, if the terminal device is an IMS terminal using voice as a center and the first information indicates that the core network corresponding to the access network device supports IMS, the terminal device selects a cell covered by the access network device to register. Through the design, after the IMS terminal taking voice as the center discovers that the network supports IMS voice in the network searching stage, the IMS terminal can select a cell covered by the access network equipment to register.

In a possible design, the first information is determined by the access network device according to an IMS voice bearer capability of the access network device and an IMS capability of the core network device, where the IMS voice bearer capability of the access network device indicates whether the access network device supports establishment of an IMS voice bearer, and the IMS capability of the core network device indicates whether the core network device supports communication with the IMS. In the above design, the access network device can accurately determine whether the network supports the IMS voice according to the IMS voice carrying capability of the access network device and the IMS capability of the core network device, so that the accuracy of network selection of the terminal device can be improved.

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

In a fifth aspect, the present application provides a network selection apparatus, which may be an apparatus for a communication system, and may also be a chip or a chip set in an apparatus for a communication system, where the apparatus for a communication system may be an access network device or a terminal device. The apparatus may include a processing unit and a transceiver unit. When the apparatus is an apparatus for a communication system, the processing unit may be a processor, and the transceiving unit may be a transceiver; the apparatus may further include a storage unit, which may be a memory; the storage unit is configured to store instructions, and the processing unit executes the instructions stored by the storage unit, so as to enable the access network device to perform the corresponding functions in the third aspect, or enable the terminal device to perform the corresponding functions in the fourth aspect. When the apparatus is a chip or a chip set in an access network device, the processing unit may be a processor, and the transceiving unit may be an input/output interface, a pin, a circuit, or the like; the processing unit executes the instructions stored by the storage unit to cause the access network device to perform the corresponding functions in the third aspect or cause the terminal device to perform the corresponding functions in the fourth aspect. The memory unit may be a memory unit (e.g., register, cache, etc.) within the chip or chipset, or a memory unit (e.g., read only memory, random access memory, etc.) external to the chip or chipset within a device for a communication system.

In a sixth aspect, the present application also provides a computer-readable storage medium having stored therein instructions that, when executed, cause the method of the above aspects to be performed.

In a seventh aspect, the present application also provides a computer program product comprising instructions which, when executed, cause the method of the above aspects to be performed.

In an eighth aspect, the present application provides a chip comprising a processor and a communication interface for receiving code instructions and transmitting them to the processor. The processor is used for calling the code instructions transmitted by the communication interface to execute the method of the aspects.

Drawings

Fig. 1 is a flow chart of an architecture of a communication system provided in the present application;

fig. 2 is a schematic flow chart of a network selection method provided in the present application;

fig. 3A is a schematic diagram of a network selection process provided in the present application;

fig. 3B is a schematic diagram of another network selection process provided herein;

fig. 3C is a schematic diagram of another network selection process provided in the present application;

fig. 4 is a schematic structural diagram of a communication device provided in the present application;

fig. 5 is a schematic structural diagram of an access network device provided in the present application;

fig. 6 is a schematic structural diagram of a terminal device provided in the present application.

Detailed Description

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

The network selection method provided by the present application may be applied to various communication systems, for example, long Term Evolution (LTE), fifth generation (5G) communication systems, a hybrid architecture of LTE and 5G, a New Radio (NR) system of 5G, a new communication system (for example, in 6G or other networks) appearing in future communication development, and the like. As long as IMS is adopted as a voice solution in the communication system, the network selection method provided by the embodiment of the present application may be adopted.

The terminal, which may also be referred to as a User Equipment (UE) in the embodiments of the present application, may be a device that provides voice and/or data connectivity to a user, for example, a handheld device, a vehicle-mounted device, or the like having a wireless connection function. The terminal may also be other processing devices connected to a wireless modem. A terminal may communicate with one or more core networks through a Radio Access Network (RAN). A terminal may also be referred to as a wireless terminal, a subscriber unit (subscriber unit), a subscriber station (subscriber station), a mobile station (mobile), a remote station (remote station), an access point (access point), a remote terminal (remote), an access terminal (access terminal), a user terminal (user terminal), a user agent (user agent), a user device (user device), or a user equipment (user equipment), among others. The terminal equipment may be mobile terminals such as mobile telephones (otherwise known as "cellular" telephones) and computers with mobile terminals, e.g. portable, pocket, hand-held, computer-included or car-mounted mobile devices, which exchange language and/or data with a radio access network. For example, the terminal device may 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 (PDA), or the like. Common terminal devices include, for example: the mobile terminal includes a mobile phone, a tablet computer, a notebook computer, a handheld computer, a Mobile Internet Device (MID), and a wearable device, such as a smart watch, a smart bracelet, a pedometer, and the like, but the embodiment of the present application is not limited thereto.

The access network device related in this embodiment may be an evolved Node B (eNB or e-NodeB) in LTE, or may also be a new radio controller (NR controller), or may be a enode B (gNB) in a 5G system, or may be a centralized network element (centralized unit), or may be a new radio base station, or may be a radio remote module, or may be a micro base station, or may be a relay (relay), or may be a distributed network element (distributed unit), or may be a reception point (TRP), a Transmission Point (TP), or any other wireless access device, but this embodiment is not limited thereto. The access network device may cover 1 or more cells.

Generally, a plurality of access network devices may exist near a terminal device, one access network device may be connected to one core network device, and may also be connected to a plurality of core network devices, for example, in a shared network scenario, one access network device may be connected to a plurality of core network devices, the access network device is shared by a plurality of operators, the core network device connected to the access network device independently provides services for the operators, for example, one access network device is connected to 2 core network devices, the 2 core network devices respectively and independently provide services for two operators, and the access network device is shared by the two operators. In the non-shared network scenario, an access network device may connect to a core network device, and the access network device independently provides services for an operator. The access network device may or may not support IMS, and the core network device may or may not support IMS. The terminal equipment can be connected to the access network equipment through an air interface message, and the access network equipment can be connected to the core network equipment through a wire.

For example, as shown in fig. 1, two access network devices, namely an access network device 1 and an access network device 2, exist near the terminal device, the access network device 1 covers a cell 1, the access network device 2 covers a cell 2, the access network device 1 is connected to a core network device 1, the access network device 2 is connected to a core network device 2 and a core network device 3, and the core network device 2 is connected to an IP Multimedia Subsystem (IMS). It should be understood that fig. 1 is only an exemplary illustration, and does not specifically limit the number of terminal devices, access network devices, core network devices, a connection relationship between a core network device and an IMS, and the like included in the communication system, and in addition, other devices may also be included in the communication system shown in fig. 1, and are not shown one by one here.

At present, when selecting a network with a voice centric IMS terminal device, a network search is performed first, and after the network search is completed, a cell meeting a condition is selected to register, that is, a registration request is sent to a core network device, and the core network device sends a registration receiving message to the terminal device after completing a registration process, where the registration receiving message carries indication information for indicating whether the network supports the IMS. The network may include an access network device and a core network device, and if both the access network device and the core network device support IMS, the network supports IMS, otherwise, the network does not support IMS. Therefore, after receiving the registration receiving message, the terminal device can determine whether the network supports the IMS according to the indication information carried by the registration receiving message, and if so, the terminal device initiates an IMS registration process. If not, the terminal equipment cannot select the current cell to provide the service, and needs to search the network again until the terminal equipment registers to the network supporting the IMS. By the network selection method, the terminal equipment can determine whether the network supports the IMS or not after registering to the core network equipment, and the network selection time is longer, so that the voice call performance of the terminal equipment is influenced.

Based on this, the embodiment of the application provides a network selection method, device and system. In the embodiment of the application, an access network device determines whether the access network device supports an IMS voice Data Radio Bearer (DRB) or whether a core network device supports IMS, and broadcasts the IMS capability of the network by carrying first information whether the IMS voice capability is supported in a system message (for example, by adding a capability field IMS-voice in a system information block 1 (SIB 1) message), so that a terminal device supporting IMS voice can determine whether a current cell supports IMS voice in a network searching phase and select registration, without waiting for registration in the cell. The method and the device in the embodiment of the application are based on the same conception, and because the principle of solving the problems of the method and the device is similar, the implementation of the device and the method can be mutually referred, and repeated parts are not repeated.

The plural in the present application means two or more. Reference to at least one in this application means one, or more than one, i.e. including one, two, three and more.

In addition, it is to be understood that the terms first, second, etc. in the description of the present application are used for distinguishing between the descriptions and not necessarily for describing a sequential or chronological order.

The first embodiment is as follows:

referring to fig. 2, a flowchart of a network selection method provided in the embodiment of the present application is shown. The method can be applied to the communication system shown in fig. 1, and comprises the following steps:

s201, the access network equipment broadcasts a system message, the system message carries first information, and the first information is used for indicating whether a core network corresponding to the access network equipment supports IMS voice. That is, the first information may be IMS voice capability information of a core network corresponding to the access network device, and is used to characterize IMS voice capability of the network.

In an exemplary illustration, the first information may be determined according to IMS voice bearer capability set by the access network. The IMS voice bearing capacity of the access network equipment indicates whether the access network equipment supports the establishment of IMS voice bearing.

In a specific implementation, the access network device may consider that the core network corresponding to the access network device supports IMS voice when the access network device supports establishing an IMS voice bearer (that is, the first information indicates that the core network corresponding to the access network device supports IMS voice), and consider that the core network corresponding to the access network device supports IMS voice when the access network device does not support establishing an IMS voice bearer (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 may default that the core network device 1 supports communication with the IMS, where the access network device 1 and the core network device 1 provide services for a first network. The access network device 1 considers that the first network supports IMS voice when the access network device itself supports establishing an IMS voice bearer, that is, the first information of the first network indicates that the first network supports IMS voice, or considers that the first network does not support IMS voice when the access network device itself does not support establishing an IMS voice bearer, 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 may consider that all core network devices connected to the access network device support communication with the IMS, and determine the first information according to the IMS voice bearer capability of the access network device, taking the access network device 2 shown in fig. 1 as an example, the access network device 2 may default that both the core network device 2 and the core network device 3 support communication with the IMS, where the core network device 2 provides service for the second network, the core network device 3 provides service for the third network, and the access network device 2 may provide service for the second network and the third network. When the access network device 2 itself supports establishing the IMS voice bearer, it considers that both the second network and the third network support the IMS voice, that is, both the first information of the second network and the first information of the third network indicate that the networks support the IMS voice. Or, when the second network and the third network do not support the establishment of the IMS voice bearer, the second network and the third network are considered not to support the IMS voice, that is, both the first information of the second network and the first information of the third network indicate that the networks do not support the IMS voice.

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

In a specific implementation, the access network device may consider that the network supports IMS voice (i.e., the first information indicates that the network supports IMS voice) when the access network device itself supports establishing an IMS voice bearer and the core network device supports communication with the IMS, and may consider that the network supports IMS voice (i.e., 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 fig. 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 provide services for a first network. The access network device 1 may regard that the first network supports IMS voice when the core network device 1 supports communication with the IMS and the access network device 1 supports establishment of an IMS voice bearer, that is, the first information indicates that the first network supports IMS voice. Otherwise, the first network is considered not to support the IMS voice, that is, the first information of the first network indicates that the first network does not support the IMS voice.

Or in a shared network scenario, taking the access network device 2 shown in fig. 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 a service for the second network, the core network device 3 provides a service for the third network, and the access network device 2 provides a service for the second network and the third network. The access network device 2 may regard the second network as supporting IMS voice when the core network device 2 supports communication with the IMS and the access network device 2 supports establishment of an IMS voice bearer, that is, the first information of the second network indicates that the second network supports IMS voice. Otherwise, the second network is considered not to support the IMS voice, that is, the first information of the second network indicates that the second network does not support the IMS voice.

Similarly, the access network device 2 may regard that the third network supports IMS voice when the core network device 3 supports communication with the IMS and the access network device 2 supports establishment of an IMS voice bearer, that is, the first information of the third network indicates that the third network supports IMS voice. Otherwise, the third network is considered not to support the IMS voice, that is, the first information of the third network indicates that the third network does not support the 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 further acquire 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 by: the core network device sends a first message to the access network device. The first message carries IMS capability information of the core network device. Therefore, the access network equipment acquires the IMS capability information of the core network equipment according to the first message after receiving the first message sent by the core network equipment.

Illustratively, the first message may be an NG application protocol (NG-AP) message for indicating IMS capabilities of the core network device.

In the method, the core network equipment can actively inform the access network equipment of the IMS capability of the core network equipment, so that the access network equipment can determine the IMS capability of the network according to the IMS capability of the core network equipment and the IMS voice bearing capability of the access network equipment. And the core network device actively informs the IMS capability of the core network device to the access network device, so that the access network device can determine the first information more accurately, and the accuracy of network selection of the terminal device is improved.

In other embodiments, the access network device may also obtain the IMS capability of the core network device by: and the access network equipment sends a second message to the core network equipment, wherein the second message is used for requesting to acquire the IMS capability information of the core network equipment. And the core network equipment sends a third message to the access network equipment after receiving the second message, wherein the third message carries the IMS capability information of the core network equipment. Correspondingly, the access network device receives the third message sent by the core network device.

In the method, the access network equipment actively queries the IMS capability of the core network equipment, so that the IMS capability of a network formed by the core network equipment and the access network equipment can be determined according to the IMS capability of the core network equipment and the IMS voice bearing capability of the access network equipment. In addition, the access network equipment actively queries the IMS capability of the core network equipment, so that the access network equipment can determine the first information more accurately, and the accuracy of network selection of the terminal equipment is improved.

In this embodiment, the system message may be, but is not limited to, an SIB message, a Master Information Block (MIB) message, and the like.

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

One possible representation of the structure of the SIB1 message may be as follows, wherein the first field may be an ims-VoiceSupport, and it should be understood that this is only an exemplary illustration and does not specifically limit the structure of the SIB1 message, the name of the first field:

in some embodiments, there may be multiple access network devices near the terminal device, and the multiple access network devices may broadcast their system messages respectively, for example, taking the communication system shown in fig. 1 as an example, there are two access network devices around the terminal device, that is, access network device 1 and access network device 2, where access network device 1 broadcasts the system message of cell 1, and access network device 2 broadcasts the system message of cell 2.

In addition, one access network device may be connected to multiple core network devices (i.e., in a sharing scenario), and the access network device may broadcast first information of different networks through multiple system messages, respectively. For example, taking the access network device 2 shown in fig. 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 a service for a public land mobile network1 (PLMN 1), and the core network device 3 provides a service for the PLMN2, and then the access network device 2 may respectively carry the first information of the PLMN1 and the first information of the PLMN2 in different system messages. Assuming that PLMN1 does not support IMS voice and PLMN2 supports IMS voice, the access network device may indicate that PLMN1 does not support IMS voice through the first field in one system message and indicate that PLMN2 supports IMS voice through the first field in another system message.

S202, the terminal equipment determines whether to select a cell covered by the access network equipment for registration according to the IMS voice bearing capacity information of the access network equipment.

In some embodiments, if the terminal device is a voice-centric (voice-centric) IMS terminal (e.g., a mobile phone), the terminal device may preferentially select a network supporting IMS voice (voice) for registration. Therefore, the terminal device may not select the 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 to register when the first information indicates that the network supports IMS voice.

For example, taking the communication system shown in fig. 1 as an example, assuming 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 the IMS and/or the access network device 1 does not support establishment of an IMS voice bearer, the IMS terminal device of the voice centric does not select a cell covered by the access network device 1 to register, but searches for a network again, 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 the IMS and the access network device 2 supports establishment of an IMS voice bearer, and after receiving the system message broadcast by the access network device 2, the IMS terminal device of the voice centric can select the cell 2 covered by the access network device 2 to register.

Compared with the prior art that the terminal device can acquire whether the network supports the IMS voice after registering in the core network device, for example, in the method shown in fig. 2, the terminal device knows that the network formed by the core network device 1 and the access network device 1 does not support the IMS voice after registering in the core network device 1, and in the embodiment of the present application, the terminal device can know that the network formed by the core network device 1 and the access network device 1 does not support the IMS voice after receiving the system message sent by the access network device 1, so that the network selection time of the terminal can be reduced.

In other embodiments, if the terminal device is not an IMS terminal with voice center, for example, the terminal device is an IMS terminal (such as a data card) with data center (data center), or the terminal device does not support IMS, the terminal device may not determine whether a network formed by the access network device and the core network device supports IMS voice, or may still select a cell covered by the access network device to register when it is determined that the network does not support IMS voice.

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. Wherein the core network can be different operators such as Verizon, AT & T, T-Mobile, sprint, etc.

The name of the registration Request is different under each access system, for example, in LTE, the name of the registration Request is Attach Request. In the NR, the registration Request is named registration Request. For convenience of description, in the embodiments of the present application, the message for requesting to register the terminal device to the core network is collectively referred to as a registration request, and in a specific implementation, the message for requesting to register the terminal device to the core network may be named as another name, such as XX. It should be understood that XX may also be understood as a registration request in this embodiment if XX may also implement a function implemented by the registration request in this embodiment.

After the registration process is completed, the core network can reply the registration receiving message to the terminal equipment. The registration receiving message may carry second information for characterizing an IMS voice capability of the network, where the second information is determined by the core network device. Therefore, the terminal equipment can determine whether to reinitiate network searching according to the second information.

In a specific implementation, if the second information indicates that the network supports the IMS voice, the terminal device initiates a registration procedure to the IMS. If the second information indicates that the network does not support the IMS voice, the terminal device may reinitiate network searching, that is, perform network selection again until the terminal device registers in the IMS.

The names of the registration received messages are different in each access standard, for example, in LTE, the registration received message is named Attach Accept. In the NR, the Registration accepted message is named Registration Accept. For convenience of description, in the embodiments of the present application, the message for notifying that the terminal device is successfully registered is collectively referred to as a registration received message, and in a specific implementation, the message for notifying that the terminal device is successfully registered may be named as another name, such as XX. It should be understood that, if the XX may also implement the function implemented by the registration received message in the embodiment of the present application, the XX may also be understood as the registration received message in the embodiment of the present application.

In order to better understand the embodiment of the present application, the following describes a network selection process of a terminal device in detail with reference to a specific application scenario. 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, the core network device 1 supports communication with the IMS, and the access network device 1 does not support 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 the IMS, and the access network device 2 supports establishment of an IMS voice bearer.

A network selection procedure of the IMS terminal device with voice center may be as follows, see fig. 3A:

s301, the terminal device initiates a network searching process and receives a system message broadcasted by the access network device 1, wherein the system message carries first information of a first PLMN, and the first information is used for indicating that the first PLMN does not support IMS voice.

S302, the terminal device re-initiates a network searching process, and receives a system message broadcast by the access network device 2, where the system message carries first information of a 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 registration Request) to the core network device 2.

S305, the core network device 2 replies a Registration received message (such as Attach Accept or Registration Accept) to the terminal device after completing the Registration procedure.

S306, the terminal device sends a registration request to the IMS, where the registration request is used to request that the terminal device be registered 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 of successful registration to the IMS.

Another network selection procedure of the IMS terminal device with voice center may be as follows, see fig. 3B:

s401a, the core network device 1 sends the 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 performed.

S401b, the core network device 2 sends the 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 performed.

It should be noted that, the step S401a and the step S401b are not in strict sequence, and the step S401a may be executed first and then the step S401b is executed, or the step S401b may be executed first and then the step S401a is executed, or the steps S401a and S401b may be executed simultaneously, which is not limited specifically herein.

In steps S402 to S408, reference may be specifically made to steps S301 to S307, and repeated descriptions are omitted.

Another network selection procedure of the IMS terminal device with voice center may be as follows, as shown in fig. 3C:

s501a, the access network device 1 sends an inquiry message to the core network device 1, where the inquiry message is used to inquire the IMS capability of the core network device 1. Step S502a is performed.

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. S503 is executed.

S501b, the access network device 2 sends an inquiry message to the core network device 2, where the inquiry message is used to inquire the IMS capability of the core network device 2. Step S502b is performed.

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. S503 is performed.

It should be noted that, the steps (S501 a-S502 a) and the steps (S501 b-S502 b) are not in strict sequence, and the steps (S501 a-S502 a) may be executed first and then the steps (S501 b-S502 b) are executed, or the steps (S501 b-S502 b) may be executed first and then the steps (S501 a-S502 a) are executed, or the steps (S501 a-S502 a) and (S501 b-S502 b) are executed at the same time, which is not limited herein.

Steps S503 to S509, refer to steps S301 to S307 specifically, and repeated details are not repeated.

In the embodiment of the application, the access network equipment broadcasts the IMS voice capability of the network in the system message, so that the terminal equipment supporting IMS voice can judge whether the current cell supports IMS voice or not in the network searching stage and select registration without waiting for registration to the cell. For example, in the network searching stage of the terminal device, it may be determined that the first PLMN does not support IMS voice according to the system message broadcast by the access network device 1, so that network searching may be initiated again. Compared with the prior art, the terminal equipment can know that the first PLMN does not support IMS voice after registering the terminal equipment to the first PLMN, and the network selection time can be reduced by the embodiment of the application, so that the voice call performance of the terminal equipment can be improved.

In addition, in the embodiment of the application, the registration receiving message sent by the core network carries the network IMS voice capability information determined by the core network equipment, so that the terminal equipment secondarily judges whether the network supports IMS voice after registering to the core network, thereby avoiding the terminal equipment from registering to the core network equipment which does not support IMS, and further improving the accuracy.

Based on the same inventive concept as the method embodiment, the embodiment of the present application provides a communication apparatus, which may have a structure as shown in fig. 4 and includes a transceiver unit 401 and a processing unit 402.

In a specific implementation manner, the communication device may be specifically configured to implement the method performed by the access network device in the embodiments shown in fig. 2 to fig. 3C, and the communication device may be the access network device itself, or may also be a chip or a chip set in the access network device, or a part of a chip in the chip for performing a function of the related method. The transceiver 401 is configured to transceive data. A processing unit, configured to broadcast a system message through the transceiving unit 401, where the system message carries first information, and the first information is used to indicate whether a core network corresponding to the access network device supports IMS voice.

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

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

For example, the first information may also be determined according to an IMS voice bearer capability of the access network device and an IMS capability of the core network device, where the IMS voice bearer capability of the access network device indicates whether the access network device supports establishing an IMS voice bearer, and the IMS capability of the core network device indicates whether the core network device supports communication with the IMS.

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

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

When acquiring the IMS capability information of the core network device, the processing unit 402 may specifically be configured to: a first message sent by a core network device is received through the transceiving unit 401, where the first message carries IMS capability information of the core network device.

When acquiring the IMS capability information of the core network device, the processing unit 402 may specifically be configured to: a second message is sent to the core network device through the transceiving unit 401, where the second message is used to request to acquire the IMS capability information of the core network device, and a third message sent by the core network device is received through the transceiving unit 401, where the third message carries the IMS capability information of the core network device.

Illustratively, the system message may be a SIB1 message.

For example, the system message may include a first field for carrying the first information.

In a specific implementation manner, the communication apparatus may be specifically used to implement the method performed by the terminal device in the embodiments shown in fig. 2 to fig. 3C, and the apparatus may be for the device itself, or may be for a chip or a chip set in the device or a part of the chip for performing the function of the related method. The receiving and sending unit 401 is configured to receive a system message sent by an access network device, where the system message carries first information, and the first information is used to indicate whether a core network corresponding to the access network device supports IMS. A processing unit 402, 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 specifically be configured to: and if the terminal equipment is an IMS terminal taking voice as a center and the first information indicates that the core network corresponding to the access network equipment does not support IMS, not selecting a cell covered by the access network equipment for registration.

The processing unit 402 may specifically be configured to: and if the terminal equipment is an IMS terminal taking voice as a center and the first information indicates that the core network corresponding to the access network equipment supports IMS, selecting a cell covered by the access network equipment for registration.

For example, the first information may be determined by the access network device according to an IMS voice bearer capability of the access network device, where the IMS voice bearer capability of the access network device refers to whether the access network device supports establishment of an IMS voice bearer. In the design, the access network device determines the first information based on the IMS voice bearing capacity of the access network device, so that the terminal device can be instructed to initiate network searching again when the access network device does not support the IMS voice bearing, the terminal device can be prevented from knowing that the network does not support IMS voice after being registered to a core network, and the network selection time of the terminal device can be shortened.

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

For example, the first information may also be determined by the access network device according to an IMS voice bearer capability of the access network device and an IMS capability of the core network device, where the IMS voice bearer capability of the access network device indicates whether the access network device supports establishment of an IMS voice bearer, and the IMS capability of the core network device indicates whether the core network device supports communication with the IMS. In the above design, the access network device can accurately determine whether the network supports the IMS voice according to the IMS voice carrying capability of the access network device and the IMS capability of the core network device, so as to improve the accuracy of network selection of the terminal device.

Illustratively, the system message is a SIB1 message.

Illustratively, the system message includes a first field for carrying the first information.

The division of the modules in the embodiments of the present application is schematic, and only one logical function division is provided, and in actual implementation, there may be another division manner, and in addition, each functional module in each embodiment of the present application may be integrated in one processor, may also exist alone physically, or may also be integrated in one module by two or more modules. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. It is understood that the functions or implementations of the respective modules in the embodiments of the present application may further refer to the related description of the method embodiments.

Fig. 5 is a schematic structural diagram of a terminal device according to an embodiment of the present application. The terminal device can be applied to the system shown in fig. 1, and performs the functions of the terminal device in the above method embodiment. For convenience of explanation, fig. 5 shows only 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-output means. The processor is mainly configured to process the communication protocol and the communication data, control the entire terminal device, execute a software program, and process data of the software program, for example, to support the terminal device to perform the actions described in the above method embodiments. The memory is primarily used for storing software programs and data. The control circuit is mainly used for converting baseband signals and radio frequency signals and processing the radio frequency signals. The control circuit and the antenna together, which may also be called a transceiver, are mainly used for transceiving radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, keyboards, etc., are mainly used for receiving data input by users and outputting data to the users.

When the terminal device is started, the processor can read the software program of the memory, interpret and execute the instruction of the software program, and process the data of the software program. When data needs to be sent wirelessly, the processor outputs a baseband signal to the radio frequency circuit after baseband processing is carried out on the data to be sent, and the radio frequency circuit sends the radio frequency signal to the outside in the form of electromagnetic waves through the antenna after radio frequency processing is carried out on the baseband signal. When data is sent to the terminal equipment, the radio frequency circuit receives radio frequency signals through the antenna, converts the radio frequency signals into baseband signals and outputs the baseband signals to the processor, and the processor converts the baseband signals into the data and processes the data.

Those skilled in the art will appreciate that fig. 5 shows only one memory and one processor for the sake of illustration. 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 a storage device, etc. The memory may be a memory element on the same chip as the processor, that is, an on-chip memory element, or a separate memory element, which is not limited in this embodiment.

As an optional implementation manner, the terminal device may include a baseband processor and a central processing unit, where the baseband processor is mainly used to process a communication protocol and communication data, and the central processing unit is mainly used to control the whole terminal device, execute a software program, and process data of the software program. The processor in fig. 5 may integrate the functions of the baseband processor and the central processing unit, and those skilled in the art will understand that the baseband processor and the central processing unit may also be independent processors, and are interconnected through a bus or the like. Those skilled in the art will appreciate that the terminal device may include a plurality of baseband processors to accommodate different network formats, the terminal device may include a plurality of central processors to enhance its processing capability, and various components of the terminal device may be connected by 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 the communication data may be built in the processor, or may 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 having the transceiving function may 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 functionality is considered to be a processing unit of the terminal device. As shown in fig. 5, the terminal device 50 includes a transceiver unit 501 and a processor 502. A transceiver unit may also be referred to as a transceiver, a transceiving device, etc. Alternatively, a device for implementing a receiving function in the transceiving unit 501 may be regarded as a receiving unit, and a device for implementing a sending function in the transceiving unit 501 may be regarded as a sending unit, that is, the transceiving unit 501 includes a receiving unit and a sending unit, the receiving unit may also be referred to as a receiver, an input port, a receiving circuit, and the like, and the sending unit may be referred to as a transmitter, or a sending circuit, and the like.

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

Fig. 6 is a schematic structural diagram of an access network device according to an embodiment of the present application, for example, a schematic structural diagram of a base station. As shown in fig. 6, the base station may be applied in the system shown in fig. 1, and performs the functions of the access network device in the above method embodiment. Base station 60 may include one or more DUs 601 and one or more CUs 602. The DU601 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 DU601 is mainly used for transceiving radio frequency signals, converting radio frequency signals and baseband signals, and partially processing baseband. CU602 may include at least one processor 6022 and at least one memory 6021. The CU602 and the DU601 can communicate with each other through an interface, wherein a Control plane (Control plane) interface can be Fs-C, such as F1-C, and a user plane (UserPlan) interface can be Fs-U, such as F1-U.

The CU602 section is mainly used to perform baseband processing, control a base station, and the like. The DU601 and the CU602 may be physically located together or physically located separately, i.e. distributed base stations. The CU602 is a control center of the base station, and may also be referred to as a processing unit, and is mainly used for performing a baseband processing function. For example, CU602 may be configured to control a base station to perform the operation procedure of the above method embodiment with respect to the access network device.

Specifically, the baseband processing on the CU and the DU may be divided according to protocol layers of the wireless network, for example, functions of a Packet Data Convergence Protocol (PDCP) layer and protocol layers above the PDCP layer are set in the CU, and functions of protocol layers below the PDCP layer, for example, functions of a Radio Link Control (RLC) layer and a Medium Access Control (MAC) layer, are set in the DU. For another example, a CU implements Radio Resource Control (RRC) and Packet Data Convergence Protocol (PDCP) functions, and a DU implements Radio Link Control (RLC), medium Access Control (MAC) and Physical (PHY) functions.

Further, optionally, base station 60 may include one or more radio frequency units (RUs), one or more DUs, and one or more CUs. Wherein the DU may comprise at least one processor 6013 and at least one memory 6014, the ru may comprise at least one antenna 6011 and at least one radio frequency unit 6012, and the cu may comprise at least one processor 6022 and at least one memory 6021.

In an example, the CU602 may be formed by one or multiple boards, and the multiple boards may jointly support a radio access network with a single access indication (e.g., a 5G network), or may separately support radio access networks with different access schemes (e.g., an LTE network, a 5G network, or other networks). The memory 6021 and processor 6022 may serve one or more single boards. That is, the memory and processor may be provided separately on each board. Multiple boards may share the same memory and processor. In addition, each single board can be provided with necessary circuits. The DU601 may be formed by one or more boards, where the boards may jointly support a wireless access network with a single access instruction (e.g., a 5G network), and may also respectively support wireless access networks with different access schemes (e.g., an LTE network, a 5G network, or other networks). The memory 6014 and the processor 6013 may serve one or more boards. That is, the memory and processor may be provided separately on each board. Multiple boards may share the same memory and processor. In addition, each single board can be provided with necessary circuits.

The embodiment of the present application further provides a computer-readable storage medium, which is used for storing computer software instructions required to be executed by the processor, and the computer software instructions include a program required to be executed by the processor.

In the above embodiments, all or part of the implementation may be realized by software, hardware, firmware, or any combination thereof. When implemented in software, may 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. The procedures or functions described in accordance with the embodiments of the application are all or partially generated when the computer program instructions are loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device including one or more available media integrated servers, data centers, and the like. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid State Disk (SSD)), among others.

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

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

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

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims

1. A network selection system, comprising:

the access network equipment is used for broadcasting a system message, wherein the system message carries first information, and the first information is used for indicating whether a core network corresponding to the access network equipment supports an IMS (IP multimedia subsystem) voice;

the terminal equipment is used for receiving the system message and determining whether to select a cell covered by the access network equipment for registration according to the first information;

the first information is determined by the access network equipment according to the IMS voice bearing capacity of the access network equipment, wherein the IMS voice bearing capacity of the access network equipment refers to whether the access network equipment supports the establishment of IMS voice bearing.

2. The system of claim 1, wherein if the access network device supports establishing an IMS voice bearer, the first information indicates that a core network corresponding to the access network device supports IMS voice;

if the access network equipment does not support the establishment of the IMS voice bearer, the first information indicates that the core network corresponding to the access network equipment does not support the IMS voice.

3. The system of claim 1, wherein the first information determined by the access network device according to the IMS voice bearer capability of the access network device comprises:

the first information is determined by the access network equipment according to the IMS voice bearing capacity of the access network equipment and the IMS capacity of core network equipment, wherein the IMS capacity of the core network equipment refers to whether the core network equipment supports communication with an IMS.

4. The system of claim 3, wherein if the access network device supports establishing an IMS voice bearer and the core network device supports communicating with an IMS, the first information indicates that a core network corresponding to the access network device supports IMS voice;

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

5. The system of claim 3, wherein the access network device is further configured to: and acquiring IMS capability information of the core network equipment.

6. The system of claim 5, 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, when acquiring the IMS capability information of the core network device, is specifically configured to:

receiving the first message.

7. The system of claim 5, wherein the network selection system further comprises a core network device;

when acquiring the IMS capability information of the core network device, the access network device is specifically configured to:

sending a second message to the core network device, where the second message is used to request to acquire 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, where the third message carries 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.

8. The system of claim 1, wherein the terminal device, when determining whether to select the cell covered by the access network device for registration according to the first information, is specifically configured to:

and if the terminal equipment is an IMS terminal taking voice as a center and the first information indicates that a core network corresponding to the access network equipment does not support IMS voice, not selecting a cell covered by the access network equipment for registration.

9. The system of claim 1, wherein the terminal device, when determining whether to select the cell covered by the access network device for registration according to the first information, is specifically configured to:

and if the terminal equipment is an IMS terminal taking voice as a center and the first information indicates that a core network corresponding to the access network equipment supports IMS voice, selecting a cell covered by the access network equipment for registration.

10. The system of claim 1, wherein the system message is a system information block 1SIB1 message.

11. The system of any one of claims 1 to 10, wherein the system message comprises a first field for carrying the first information.

12. A terminal device, comprising:

the system comprises a transceiver and a controller, wherein the transceiver is used for receiving a system message sent by access network equipment, the system message carries first information, and the first information is used for indicating whether a core network corresponding to the access network equipment supports a network protocol multimedia subsystem (IMS);

the processor is used for determining whether to select a cell covered by the access network equipment for registration according to the first information;

13. The terminal device of claim 12, wherein the processor is specifically configured to:

and if the terminal equipment is an IMS terminal taking voice as a center and the first information indicates that the core network corresponding to the access network equipment does not support IMS, not selecting the cell covered by the access network equipment for registration.

14. The terminal device of claim 12, wherein the processor is specifically configured to:

and if the terminal equipment is an IMS terminal taking voice as a center and the first information indicates that a core network corresponding to the access network equipment supports IMS, selecting a cell covered by the access network equipment for registration.

15. The terminal device of claim 12, wherein if the access network device supports establishing an IMS voice bearer, the first information indicates that a core network corresponding to the access network device supports IMS voice;

16. The terminal device of claim 12, wherein the first information is determined by the access network device according to IMS voice bearer capability of the access network device, and comprises:

the first information is determined by the access network equipment according to the IMS voice bearing capacity of the access network equipment and the IMS capacity of core network equipment, wherein the IMS capacity of the core network equipment refers to whether the core network equipment supports communication with IMS.

17. The terminal device of claim 16, wherein if the access network device supports establishing an IMS voice bearer and the core network device supports communicating with an IMS, the first information indicates that a core network corresponding to the access network device supports IMS voice;

18. The terminal device of claim 12, wherein the system message is a system information block 1, SIB1, message.

19. The terminal device according to any of claims 12 to 18, wherein the system message comprises a first field for carrying the first information.