WO2022067734A1

WO2022067734A1 - Communication method, apparatus and system

Info

Publication number: WO2022067734A1
Application number: PCT/CN2020/119588
Authority: WO
Inventors: 雷显调; 舒林; 潘晓刚; 李洪; 孙兵
Original assignee: 华为技术有限公司
Priority date: 2020-09-30
Filing date: 2020-09-30
Publication date: 2022-04-07
Also published as: CN115552971A

Abstract

Provided are a communication method, apparatus and system. The method comprises: a user equipment sending a first registration request message to a first network device, wherein the first network device is located in a first 5G network; and the user equipment receiving a first registration response message from the first network device, wherein the first registration response message comprises first capability information, and the first capability information is used for representing the support capability for VoNR and/or the support capability for VoEF-only. In the present application, a network informs a UE of the support capability for VoNR and/or the support capability for VoEF-only of the network, such that the UE can perform a subsequent communication process in combination with the capability of the UE itself, thereby implementing a voice service.

Description

A communication method, device and system

technical field

The present application relates to the field of wireless communication technologies, and in particular, to a communication method, device, and system.

Background technique

5G (fifth generation mobile communication technology) network adopts voice over new radio (VoNR,) to realize the voice service of user equipment (UE). Among them, the VoNR method refers to the voice service of the Internet Protocol IP Multimedia Subsystem (IP multiple subsystem, IMS) provided by the 5G access network and the core network.

At present, due to the capabilities of the base station, wireless network deployment and other issues, the UE cannot perform the voice service in the VoNR mode on the 5G network. At this time, how to realize the voice service of the UE has become an urgent problem to be solved.

SUMMARY OF THE INVENTION

The present application provides a communication method, device and system to realize the voice service of the UE.

In a first aspect, the present application provides a communication method, which can be applied to a first 5G network. Then, the method may include: the user equipment sends a first registration request message to the first network device; the user equipment receives a first registration response message from the first network device, where the first registration response message includes the first capability information; wherein, The first capability information is used to indicate the support capability of VoNR and/or the support capability of VoEF-only.

Here, the above-mentioned NR support capability means that the 5G network supports or does not support VoNR, and the VoEF-only support capability means supports VoEF-only or does not support VoEF-only. only.

Optional, VoEF-only. VoEF-only can be understood as only the EPS fallback carries IMS voice (ie, only VoEF), that is, the voice service is implemented only through the EPS fallback.

In this application, the first network device may carry the first capability information in the first registration response message, so as to notify the user equipment of the network support capabilities, so that the user equipment can perform subsequent communication processes in combination with its own capabilities.

In some possible implementations, the first registration request message includes a 5G system network characteristic support information element, and the 5G system network characteristic support information element includes the foregoing first capability information.

In some other possible implementations, the first capability information is located in the fourth and/or fifth bits of the fifth octet of the 5G system network characteristic support information element.

In some other possible implementation manners, when the first capability information is a first value, the first capability information is used to indicate that VoNR is supported; when the first capability information is a second value, the first capability information is used to indicate that VoNR is not supported VoNR.

In some other possible implementation manners, when the first capability information is a third value, the first capability information is used to indicate that VoEF-only is supported; when the first capability information is a fourth value, the first capability information indicates that VoEF-only is not supported VoEF-only.

In some other possible implementations, the first capability information includes a first field and a second field, the first field is used to indicate the current network VoNR support capability, and the second field is used to indicate the EPS fallback bearer IMS voice VoEF support capability .

In other possible implementations, when the first field indicates that VoNR is not supported and the second field indicates that VoEF is supported, the first capability information indicates that VoNR is not supported or VoEF-only is supported; when the first field indicates that VoNR is supported, the second When the field indicates that VoEF is supported, the first capability information indicates that VoNR is supported or VoEF-only is not supported.

In some other possible implementation manners, if the first capability of the user equipment is disabled and the first capability information indicates that VoNR is not supported or VoEF-only is supported, the above method further includes: enabling the first capability of the user equipment, and Send a second registration request message to the first network device, where the second registration request message includes first indication information, where the first indication information is used to indicate that the first capability is enabled, and the first capability is S1 mode and/or E- UTRA capability.

In some other possible implementation manners, if the first capability of the user equipment is disabled, and the first capability information indicates that VoNR is not supported or VoEF-only is supported, the above method further includes: the user equipment sends the first capability to the second network device. Three registration request messages; the user equipment receives a second registration response message from the second network device, the second registration response message includes second capability information, and the second capability information indicates that VoNR is supported or VoEF-only is not supported, and the second network device is located in In the second 5G network, the second network device may be the AMF in the second 5G network.

In some other possible implementation manners, if the first capability of the user equipment is disabled, and the first capability information indicates that VoNR is not supported or VoEF-only is supported, the above method further includes: the user equipment sends the first capability to the second network device. Four registration request messages, the second network device is located in the 2G or 3G network, and the second network device may be an MSC in the 2G or 3G network.

In some other possible implementation manners, the above method further includes: disabling the first capability by the user equipment; disabling the N1 mode by the user equipment.

Here, in some scenarios of the 4G network, the user equipment can disable its own first capability, and the user equipment can also disable the N1 mode. In this way, during the period when the first capability of the user equipment is disabled, the user The N1 mode of the device is also disabled, thereby avoiding ping-pong switching.

In this application, the user equipment notifies the network that the first capability of itself is disabled during the registration process, and the network carries the first capability information of the first 5G network in the registration response message sent to the user equipment. Indicates that in the scenario where the first 5G network does not support VoNR or supports VoEF, the user equipment can perform the above registration process to register with the first 5G network, the second 5G network, the 2G network or the 3G network, thereby realizing the voice service of the user equipment.

In a second aspect, the present application provides a communication method, which can be applied to the first 5G network. The method may include: the first network device receives a first registration request message from the user equipment; the first network device sends a first registration response message to the user equipment, where the first registration response message includes first capability information; wherein the first The capability information is used to indicate the support capability of VoNR and/or the support capability of VoEF-only.

In some possible implementations, the first registration response message includes a 5G system network characteristic support information element, and the 5G system network characteristic support information element includes the first capability information.

In a third aspect, the present application provides a communication method, which can be applied to the first 5G network. The method may include: the user equipment sends a first registration request message to the first network device, the first registration request message includes second indication information, the second indication information is used to indicate that the first capability of the user equipment is disabled, the first The capability is S1 mode and/or E-UTRA capability; the user equipment receives the first registration rejection message sent by the first network device, the first registration rejection message includes rejection reason information, and the rejection reason information is used to indicate that the first 5G network does not support VoNR Or support VoEF-only.

In some possible implementations, the above method further includes: the user equipment enables the first capability, and sends a second registration request message to the first network device, where the second registration request message includes first indication information, and the first indication information uses to indicate that the first capability of the user equipment is enabled.

In some other possible implementation manners, the above method further includes: the user equipment sends third registration request information to a second network device, and the second network device is located in the second 5G network; the user equipment receives the second registration request from the second network device. The registration response message, the second registration response message includes second capability information, and the second capability information indicates that VoNR is supported or VoEF-only is not supported.

In some other possible implementation manners, the above method further includes: the user equipment sends a fourth registration request message to a second network device, where the second network device is located in a 2G or 3G network.

In this application, the UE notifies the network that its first capability is disabled during the registration process, and the network rejects the UE when the first capability of the UE is disabled and the first 5G network does not support VoNR or supports VoEF. and inform the UE that the registration fails because the first 5G network does not support VoNR or supports VoEF-only, so that the UE can perform the above registration process and register to the first 5G network, the second 5G network, the 2G network or the 3G network, And then realize the voice business.

In a fourth aspect, the present application provides a communication method, which can be applied to the first 5G network. The method may include: the first network device receives a first registration request message from the user equipment, the first registration request message includes second indication information, the second indication information is used to indicate that the first capability of the user equipment is disabled, and the first registration request message includes second indication information. A capability is S1 mode and/or E-UTRA capability; the first network device sends a first registration rejection message to the user equipment, the first registration rejection message includes rejection reason information, and the rejection reason information is used to indicate that the first 5G network does not support VoNR Or support VoEF-only.

In a fifth aspect, the present application provides a communication method, which can be applied to the first 5G network. The method may include: the user equipment receives a first cancellation message sent by a third network device; wherein the first cancellation message is used to instruct cancellation of the first IMS voice service of the user equipment, the first cancellation message includes service cancellation reason information, and the service cancellation The reason information is that the first capability of the user equipment is disabled, and the first capability is the S1 mode or the E-UTRA capability.

In some possible implementation manners, the above method further includes: the user equipment sends a first message to the third network device, where the first message is used to trigger the first IMS voice service; or, the user equipment receives the first message from the third network device information.

In other possible embodiments, the user equipment includes an access (AS) layer and a non-access (NAS) layer; the above method further includes: the NAS layer enables the first capability and instructs the AS layer to continue camping in the current cell .

In some other possible implementation manners, the above method further includes: when the user equipment successfully completes the IMS voice service, the user equipment disables the first capability.

In some other possible implementation manners, the above-mentioned method further includes: the user equipment initiates a registration process in a first cell, and the first cell is an NR cell that supports the new wireless NR bearer of IMS voice VoNR or does not support the EPS fallback bearer of the evolved packet system only IMS voice VoEF-only NR cell; or, the user equipment initiates a registration process in a second cell, which is a GSM cell or a UTRA cell.

Here, the above-mentioned 5G network can be understood as a 5G PLMN, and can also be understood as an NR cell (5G cell) under PLMN; 2G network or 3G network can be understood as GSM PLMN or UTRA PLMN, and can also be understood as a GSM under PLMN cell or UTRA cell.

In some other possible implementation manners, the above method further includes: when the user equipment disables the N1 mode, the user equipment starts a timer; when the timer times out, the user equipment enables the N1 mode.

In this embodiment of the present application, the user equipment informs the network that its first capability is disabled during the registration process. Then, in a scenario where the first 5G network does not support VoNR or supports VoEF, the user equipment triggers the first IMS voice service After that, the IMS sends a first cancellation message to the UE because the first capability of the user equipment is disabled, and informs the user equipment of the reason for the failure of the first IMS voice service, so that the user equipment can perform the above registration process and register to the first 5G network. , the second 5G network, 2G network or 3G network, and then realize the voice service.

In a sixth aspect, the present application provides a communication method, which can be applied to the first 5G network. The method may include: the third network device sends a first cancellation message to the user equipment; wherein the first cancellation message is used to instruct the cancellation of the first IMS voice service of the user equipment, and the first cancellation message includes the failure reason of the first IMS voice service information, the failure cause information is used to indicate that the first capability of the user equipment is disabled, and the first capability is the S1 mode or the E-UTRA capability.

In some possible implementation manners, the above method further includes: the third network device receives a first message from the user equipment, where the first message is used to trigger the first IMS voice service; or, the third network device sends the first message to the user equipment information.

In some other possible implementation manners, the above method further includes: the third network device sends a second message to the first network device, where the second message is used to trigger the establishment of a QoS flow for the first IMS voice service.

In some other possible implementation manners, the above method further includes: the third network device receives third information from the first network device, the third message is used to trigger sending the first cancellation message to the user equipment, and the third message includes the failure reason information.

In a seventh aspect, the present application provides a communication method, which can be applied to the first 5G network. The method may include: the fourth network device receives a fourth message from the first network device, where the fourth message is used to request the establishment of a QoS flow for the first IMS voice service of the user equipment; the fourth network device sends a fourth message to the first network device Five messages, the fifth message includes failure cause information of the first IMS voice service, and the failure cause information is used to indicate that the first capability of the user equipment is disabled, and the first capability is the S1 mode or the E-UTRA capability.

In an eighth aspect, the present application provides a communication method, which can be applied to the first 5G network. The method may include: the user equipment receives a sixth message from the fourth network device, the sixth message includes third capability information, and the third capability information is used to indicate that the current cell of the user equipment does not support VoNR or supports VoEF-only, and the user equipment The first capability is disabled, and the first capability is the S1 mode or the E-UTRA capability; the user equipment performs one of the following steps according to the sixth message: the user equipment enables the first capability, and initiates a registration process in the current cell; The user equipment initiates the registration process in the first cell, which supports VoNR or does not support VoEF-only; the user equipment initiates the registration process in the second cell, which is a GSM cell or a UTRA cell.

Here, the current cell, the first cell, and the second cell may be different cells under the same PLMN, or may be cells under different PLMNs.

In some other possible implementation manners, the user equipment includes an access (AS) layer and a non-access (NAS) layer; enabling the first capability by the user equipment includes: enabling the first capability at the NAS layer; the above method may further include : The NAS layer instructs the AS layer to continue camping on the current cell.

In the embodiment of the present application, after the user equipment resides on the first 5G network, the fourth network device informs the first 5G network that it does not support VoNR or supports VoEF through a system message, and the first capability of the user equipment is disabled, then , in such a scenario, the user equipment can perform the above-mentioned registration process to register to the first 5G network, the second 5G network, the 2G network or the 3G network, and then implement the voice service.

In a ninth aspect, the present application provides a communication method, which can be applied to the first 5G network. The method may include: the fourth network device sends a sixth message to the user equipment, where the sixth message includes third capability information, where the third capability information is used to indicate that the current cell of the user equipment does not support VoNR or supports VoEF-only, and the user equipment's current cell does not support VoNR or supports VoEF-only. The first capability is disabled, and the first capability is the S1 mode or the E-UTRA capability.

In a tenth aspect, the present application provides a communication method, which can be applied to the first 5G network. The method may include: the user equipment receives a second cancellation message from the third network device, the second cancellation message is used to instruct the cancellation of the first IMS voice service of the user equipment, the first capability of the user equipment is disabled, the first capability It is the S1 mode or the E-UTRA capability; when the number of times the user equipment receives the cancellation message is equal to or greater than the preset threshold, and the QoS flow of the first IMS voice service is not established, the user equipment enables the first capability and sends the first The network device sends a second registration request message, where the second registration request message includes first indication information, and the first indication information is used to indicate that the first capability is enabled; or, when the number of times the user equipment receives the cancel message is equal to or greater than a preset number threshold, and when the QoS flow of the first IMS voice service is not established, the user equipment sends a third registration request message to the second network device, the second network device is located in the second 5G network, and the second 5G network supports VoNR or does not support VoEF -only; or, when the number of times the user equipment receives the cancellation message is equal to or greater than the preset threshold, and the QoS flow of the first IMS voice service is not established, the user equipment sends a fourth registration request message to the second network device, and the second The network equipment is located in a 2G network or a 3G network.

In this embodiment of the present application, the user equipment informs the network that its first capability is disabled during the registration process. Then, in a scenario where the first 5G network does not support VoNR or supports VoEF, the user equipment triggers the first IMS voice service After that, the IMS sends a second cancellation message to the user equipment because the first capability of the user equipment is disabled. After receiving the second cancellation message, the user equipment determines whether the number of received cancellation messages is equal to or greater than the preset threshold, and If it is equal to or greater than the preset threshold, the user equipment considers that the reason for the failure of its own IMS voice service is that the first capability of the user equipment is disabled. Two 5G network, 2G network or 3G network, and then realize the voice service.

In an eleventh aspect, the present application provides a communication method, which can be applied to a first 5G network. The method may include: the user equipment sends a first message to the first network device, the first message is used to trigger the IMS voice service, the first capability of the user equipment is disabled, and the first capability is the S1 mode capability or the E-UTRA capability ; The user equipment enables the first capability.

In this embodiment of the present application, the user equipment does not need the network to notify its own first capability to be disabled, but enables the first capability by itself when or before initiating the IMS calling service, so that the user equipment can not support VoNR Or implement voice services in networks that support VoEF-only.

In a twelfth aspect, the present application provides a communication method, which can be applied to a first 5G network. The method may include: if the first capability of the user equipment is disabled and the user equipment is a voice center, the user equipment enables the first capability, and sends a second registration request message to the first network device, the second registration request The message includes first indication information, where the first indication information is used to indicate that the first capability is enabled, the first network device is located in the first 5G network, and the first capability is the S1 mode capability or the E-UTRA capability; or, if the user equipment The first capability is disabled, and the user equipment is a voice center, the user equipment sends a third registration request message to the second network device, the second network device is located in the second 5G network, and the second 5G network VoNR or does not support VoEF-only; or, if the first capability of the user equipment is disabled and the user equipment is a voice center, the user equipment sends a fourth registration request message to the second network device, and the second network device is located on the 2G network or the 3G network middle.

In some possible implementations, the above method further includes: disabling the first capability by the user equipment; disabling the N1 mode by the user equipment.

In this embodiment of the present application, in a scenario where the user equipment's own first capability is disabled and the user equipment is voice-centric, after the user equipment resides on the first 5G network, the user equipment can enable its own first capability, and then Register to the first 5G network, and then realize the voice service; or, the user equipment chooses to fall back to the 2G network or 3G network, and then realize the voice service.

In a thirteenth aspect, the present application provides a communication apparatus, which may be a chip or a system-on-chip in a user equipment, or may be any possible implementation manner in the user equipment for implementing the first aspect or the first aspect functional modules of the method. For example, the communication apparatus includes: a sending module for sending a first registration request message; a receiving module for receiving a first registration response message from a first network device, where the first registration response message includes the first capability information; wherein, the first capability information is used to indicate the support capability of VoNR and/or the support capability of VoEF-only.

In some other possible implementation manners, if the first capability of the user equipment is disabled, and the first capability information indicates that VoNR is not supported or VoEF-only is supported, the above apparatus further includes: a processing module for enabling the first capability capability; the sending module is further configured to send a second registration request message to the first network device, wherein the second registration request message includes first indication information, and the first indication information is used to indicate that the first capability is enabled and the first capability for S1 mode and/or E-UTRA capability.

In some other possible implementation manners, if the first capability of the user equipment is disabled, and the first capability information indicates that VoNR is not supported or VoEF-only is supported, the sending module is further configured to send the third network device to the second network device. a registration request message; the receiving module is further configured to receive a second registration response message from the second network device, the second registration response message includes second capability information, the second capability information indicates that VoNR is supported or VoEF-only is not supported, and the second The network device is located in the second 5G network, and the second network device may be an AMF in the second 5G network.

In some other possible implementation manners, if the first capability of the user equipment is disabled, and the first capability information indicates that VoNR is not supported or VoEF-only is supported; the sending module is further configured to send the fourth network device to the second network device. In the registration request message, the second network device is located in the 2G or 3G network, and the second network device may be an MSC in the 2G or 3G network.

In some other possible implementation manners, the above-mentioned apparatus further includes: a processing module configured to disable the first capability; and disable the N1 mode.

In a fourteenth aspect, the present application provides a communication device. The communication device may be a chip or a system-on-a-chip in the first network device, and may also be any one of the first network device used to implement the second aspect or the second aspect. Functional modules of the methods described in possible implementations. For example, the communication apparatus includes: a receiving module for receiving a first registration request message from a user equipment; a sending module for sending a first registration response message to the user equipment, where the first registration response message includes a first registration response message. Capability information; wherein, the first capability information is used to indicate the support capability of VoNR and/or the support capability of VoEF-only.

In a fifteenth aspect, the present application provides a communication apparatus, which may be a chip or a system-on-chip in a user equipment, or may be any possible implementation manner in the user equipment for implementing the third aspect or the third aspect functional modules of the method. For example, the communication apparatus includes: a sending module configured to send a first registration request message to the first network device, where the first registration request message includes second indication information, and the second indication information is used to indicate the first registration request message of the user equipment. The capability is disabled, and the first capability is the S1 mode and/or the E-UTRA capability; the receiving module is configured to receive the first registration rejection message sent by the first network device, where the first registration rejection message includes rejection reason information, the rejection reason The information is used to indicate that the first 5G network does not support VoNR or supports VoEF-only.

In some possible implementation manners, the above apparatus further includes: a processing module configured to enable the first capability; a sending module further configured to send a second registration request message to the first network device, where the second registration request message includes the first Indication information, where the first indication information is used to indicate that the first capability of the user equipment is enabled.

In some other possible implementations, the sending module is further configured to send third registration request information to the second network device, and the second network device is located in the second 5G network; the receiving module is further configured to receive information from the second network device The second registration response message includes second capability information, and the second capability information indicates that VoNR is supported or VoEF-only is not supported.

In some other possible implementation manners, the sending module is further configured to send a fourth registration request message to the second network device, where the second network device is located in the 2G or 3G network.

In a sixteenth aspect, the present application provides a communication device. The communication device may be a chip or a system-on-a-chip in the first network device, and may also be any one of the first network device used to implement the fourth aspect or the fourth aspect. Functional modules of the methods described in possible implementations. For example, the communication apparatus includes: a receiving module configured to receive a first registration request message from the user equipment, where the first registration request message includes second indication information, and the second indication information is used to indicate the first capability of the user equipment is disabled, the first capability is the S1 mode and/or the E-UTRA capability; the sending module is used to send the first registration rejection message to the user equipment, the first registration rejection message includes rejection reason information, and the rejection reason information is used to indicate The first 5G network does not support VoNR or supports VoEF-only.

In a seventeenth aspect, the present application provides a communication device. The communication device may be a chip or a system-on-chip in a user equipment, or may be any possible implementation manner in the user equipment for implementing the fifth aspect or the fifth aspect. functional modules of the method. For example, the communication apparatus includes: a receiving module configured to receive a first cancellation message sent by a third network device; wherein the first cancellation message is used to instruct cancellation of the first IMS voice service of the user equipment, and the first cancellation message Including service cancellation reason information, the service cancellation reason information is that the first capability of the user equipment is disabled, and the first capability is the S1 mode or the E-UTRA capability.

In some possible implementation manners, the above apparatus further includes: a sending module, configured to send a first message to the third network device, where the first message is used to trigger the first IMS voice service; or, a receiving module, further configured to receive data from The first message of the third network device.

In some other possible implementation manners, the above apparatus further includes: a processing module configured to disable the first capability when the user equipment successfully completes the IMS voice service.

In some other possible implementation manners, the sending module is further configured to initiate a registration process in a first cell, where the first cell is an NR cell or an NR cell that does not support VoEF-only; or, initiate a registration process in a second cell, The second cell is a GSM cell or a UTRA cell.

In some other possible implementation manners, the processing module is further configured to start a timer when the user equipment disables the N1 mode; when the timer times out, enable the N1 mode.

In an eighteenth aspect, the present application provides a communication device. The communication device may be a chip or a system-on-chip in a third network device, or may be any one of the sixth aspect or the sixth aspect in the third network device. Functional modules of the methods described in possible implementations. For example, the communication apparatus includes: a sending module configured to send a first cancellation message to the user equipment; wherein the first cancellation message is used to instruct the cancellation of the first IMS voice service of the user equipment, and the first cancellation message includes the first cancellation message. Failure cause information of the IMS voice service, the failure cause information is used to indicate that the first capability of the user equipment is disabled, and the first capability is the S1 mode or the E-UTRA capability.

In some possible implementation manners, the above apparatus further includes: a receiving module, configured to receive a first message from the user equipment, where the first message is used to trigger the first IMS voice service; or, a sending module, further configured to send a message to the user equipment Send the first message.

In some other possible implementation manners, the sending module is further configured to send a second message to the first network device, where the second message is used to trigger the establishment of a QoS flow for the first IMS voice service.

In some other possible implementations, the receiving module is further configured to receive third information from the first network device, the third message is used to trigger sending the first cancellation message to the user equipment, and the third message includes failure reason information.

In a nineteenth aspect, the present application provides a communication device. The communication device may be a chip or a system-on-a-chip in a fourth network device, or may be any one of the seventh or seventh aspects in the fourth network device. Functional modules of the methods described in possible implementations. For example, the communication apparatus includes: a receiving module for receiving a fourth message from the first network device, where the fourth message is used to request to establish a QoS flow for the first IMS voice service of the user equipment; a sending module for Send a fifth message to the first network device, where the fifth message includes failure cause information of the first IMS voice service, where the failure cause information is used to indicate that the first capability of the user equipment is disabled, and the first capability is S1 mode or E- UTRA capability.

In a twentieth aspect, the present application provides a communication device. The communication device may be a chip or a system-on-chip in a user equipment, and may also be a user equipment for implementing the eighth aspect or any possible implementation manner of the eighth aspect. functional modules of the method. For example, the communication apparatus includes: a receiving module configured to receive a sixth message from a fourth network device, where the sixth message includes third capability information, and the third capability information is used to indicate that the current cell of the user equipment does not support VoNR Or support VoEF-only, the first capability of the user equipment is disabled, and the first capability is the S1 mode or the E-UTRA capability; the sending module is configured to perform one of the following steps according to the sixth message: enable the first capability Capability, initiate the registration process in the current cell; initiate the registration process in the first cell, the first cell supports VoNR or does not support VoEF-only; initiate the registration process in the second cell, the second cell is a GSM cell or a UTRA cell.

In a twenty-first aspect, the present application provides a communication apparatus, which may be a chip or a system-on-chip in a user equipment, or may be a user equipment for implementing the ninth aspect or any possible implementation of the ninth aspect The functional modules of the method described in the manner. For example, the communication apparatus includes: a sending module configured to send a sixth message to the user equipment, where the sixth message includes third capability information, and the third capability information is used to indicate that the current cell of the user equipment does not support VoNR or supports VoEF -only, the first capability of the user equipment is disabled, and the first capability is the S1 mode or the E-UTRA capability.

In a twenty-second aspect, the present application provides a communication apparatus, which may be a chip or a system-on-chip in a user equipment, or may be a user equipment for implementing the tenth aspect or any possible implementation of the tenth aspect The functional modules of the method described in the manner. For example, the communication apparatus includes: a receiving module configured to receive a second cancellation message from a third network device, where the second cancellation message is used to instruct the cancellation of the first IMS voice service of the user equipment, and the first capability of the user equipment is disabled, and the first capability is the S1 mode or the E-UTRA capability; the processing module is used when the number of times the user equipment receives the cancellation message is equal to or greater than the preset threshold, and the QoS flow of the first IMS voice service is not established , the user equipment enables the first capability; the sending module is configured to send a second registration request message to the first network device, where the second registration request message includes first indication information, and the first indication information is used to indicate that the first capability is enabled Or, the sending module is also used to send the third registration request message to the second network device when the number of times the user equipment receives the cancellation message is equal to or greater than the preset threshold, and the QoS flow of the first IMS voice service is not established, The second network device is located in the second 5G network, and the second 5G network supports VoNR or does not support VoEF-only; or, when the number of times the user equipment receives the cancellation message is equal to or greater than the preset threshold, and the QoS of the first IMS voice service When the flow is not established, a fourth registration request message is sent to the second network device, and the second network device is located in the 2G network or the 3G network.

In some possible implementations, the sending module is further configured to send a first message to the third network device, where the first message is used to trigger the first IMS voice service; or, the receiving module is further configured to receive data from the third network device first news.

In some other possible implementations, the processing module is further configured to disable the first capability; disable the N1 mode.

In a twenty-third aspect, the present application provides a communication device. The communication device may be a chip or a system-on-a-chip in a user equipment, and may also be any possibility for implementing the eleventh aspect or the eleventh aspect in the user equipment. The functional modules of the method described in the implementation manner. For example, the communication apparatus includes: a sending module configured to send a first message to the first network device, where the first message is used to trigger the IMS voice service, the first capability of the user equipment is disabled, and the first capability is S1 mode capability or E-UTRA capability; a processing module for enabling the first capability.

In some other possible implementation manners, the processing module is further configured to disable the first capability when the user equipment successfully completes the IMS voice service.

In a twenty-fourth aspect, the present application provides a communication device, which may be a chip or a system-on-a-chip in a user equipment, or may be any possibility in the user equipment for implementing the twelfth aspect or the twelfth aspect The functional modules of the method described in the implementation manner. For example, the communication apparatus includes: a processing module and a sending module; the processing module is configured to enable the first capability if the first capability of the user equipment is disabled and the user equipment is a voice center; the sending module, is used to send a second registration request message to the first network device, where the second registration request message includes first indication information, and the first indication information is used to indicate that the first capability is enabled, and the first network device is located in the first 5G network, The first capability is the S1 mode capability or the E-UTRA capability; or, the sending module is further configured to send the third registration to the second network device if the first capability of the user equipment is disabled and the user equipment is a voice center The request message, the second network device is located in the second 5G network, the second 5G network VoNR or does not support VoEF-only; or, the sending module is also used if the first capability of the user equipment is disabled, and the user equipment is The voice center sends a fourth registration request message to the second network device, where the second network device is located in the 2G network or the 3G network.

In some possible implementations, the processing module is further configured to disable the first capability; disable the N1 mode.

In a twenty-fifth aspect, the present application provides a user equipment, including: a processor and a memory; the processor is coupled to the memory, and the processor is configured to read and execute instructions in the memory, so as to implement the first aspect and the third The communication method of any one of the aspect, the fifth aspect, the eighth aspect, and the tenth to thirteenth aspects.

In a twenty-sixth aspect, the present application provides an AMF, comprising: a processor and a memory; the processor is coupled to the memory, and the processor is configured to read and execute instructions in the memory, so as to implement the second and fourth aspects Any of the communication methods.

In a twenty-seventh aspect, the present application provides an access network device, comprising: a processor and a memory; the processor is coupled to the memory, and the processor is configured to read and execute instructions in the memory, so as to implement the seventh aspect or The communication method of any one of the ninth aspects.

In a twenty-eighth aspect, the present application provides an IMS, comprising: a processor and a memory; the processor is coupled to the memory, and the processor is configured to read and execute instructions in the memory, so as to implement any one of the sixth aspects. communication method.

In a twenty-ninth aspect, the present application provides a communication system, including: an access network device, an AMF, and an IMS; the AMF is configured to execute the communication method according to any one of the second aspect and the fourth aspect; and the access network device, For executing the communication method according to any one of the seventh aspect or the ninth aspect; IMS, for executing the communication method according to any one of the sixth aspect.

In a thirtieth aspect, the present application provides a computer-readable storage medium, where the computer-readable storage medium stores instructions, when the instructions are executed on a computer, for executing any one of the above-mentioned first to twelfth aspects. communication method.

In a thirty-first aspect, the present application provides a computer program or computer program product, which, when the computer program or computer program product is executed on a computer, enables the computer to implement the communication of any one of the above-mentioned first to twelfth aspects method.

It should be understood that the thirteenth to thirty-first aspects of the present application are consistent with the technical solutions of the first to twelfth aspects of the present application, and the beneficial effects obtained by each aspect and the corresponding feasible embodiments are similar, No longer.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present application more clearly, the accompanying drawings required in the embodiments of the present application or the background technology will be described below.

FIG. 1 is a schematic structural diagram of a communication system in an embodiment of the application;

FIG. 2 is a first schematic flowchart of a communication method in an embodiment of the present application;

3A is a schematic diagram of a first registration process of a UE in an embodiment of the present application;

3B is a schematic diagram of a second registration process of a UE in an embodiment of the present application;

3C is a schematic diagram of a third registration process of a UE in an embodiment of the present application;

FIG. 4 is a second schematic flowchart of the communication method in the embodiment of the application;

FIG. 5 is a third schematic flowchart of the communication method in the embodiment of the application;

FIG. 6 is a fourth schematic flowchart of the communication method in the embodiment of the application;

FIG. 7 is a fifth schematic flowchart of the communication method in the embodiment of the application;

FIG. 8 is a sixth schematic flowchart of the communication method in the embodiment of the application;

FIG. 9 is a seventh schematic flowchart of the communication method in the embodiment of the present application;

FIG. 10 is a schematic structural diagram of a communication device in an embodiment of the present application;

FIG. 11 is a schematic diagram of hardware of a communication device in an embodiment of the present application.

Detailed ways

The embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application. In the following description, reference is made to the accompanying drawings which form a part of this application and which illustrate, by way of illustration, specific aspects of embodiments of the application or in which specific aspects of embodiments of the application may be used. It should be understood that the embodiments of the present application may be utilized in other aspects and may include structural or logical changes not depicted in the accompanying drawings. Therefore, the following detailed description should not be taken in a limiting sense. For example, it should be understood that disclosures in connection with a described method may equally apply to a corresponding apparatus or system for performing the described method, and vice versa. For example, if one or more specific method steps are described, the corresponding apparatus may include one or more units, such as functional units, to perform one or more of the described method steps (eg, one unit performs one or more steps) , or units, each of which performs one or more of the steps), even if such unit or units are not explicitly described or illustrated in the figures. On the other hand, if, for example, a specific apparatus is described based on one or more units, such as functional units, the corresponding method may contain a step to perform the functionality of the one or more units (eg, a step to perform the one or more units) functionality, or steps, each of which performs the functionality of one or more of the plurality of units), even if such one or more steps are not explicitly described or illustrated in the figures. Further, it is to be understood that the features of the various exemplary embodiments and/or aspects described herein may be combined with each other unless expressly stated otherwise.

Two voice access methods are defined in the 5G (fifth generation mobile communication technology) network: new radio bearer Internet Protocol Multimedia Subsystem (IP multiple subsystem, IMS) voice (voice over new radio, VoNR) and evolved packet system fallback ( The evolved packet system fallback, EPS fallback) carries IMS voice (voice over EPS fallback, VoEF). Among them, the VoNR mode refers to the IMS voice service provided by the 5G access network and the core network, and the VoEF mode refers to that the UE falls back to EPS (fourth generation mobile communication technology (4G)) when the UE initiates the IMS voice service on the 5G network. Voice service is realized through 4G network.

The embodiments of the present application provide a communication system, in which a 4G network and a 5G network can coexist, and a UE can perform interworking (interworking) through the 4G communication network and the 5G communication network. FIG. 1 is a schematic structural diagram of a communication system in an embodiment of the present application. Referring to FIG. 1 , the 4G network may be a long term evolution (long term evolution, LTE) network. Among them, the 4G communication network includes a 4G access network and a 4G core network (core network, CN), the 4G core network can be an EPC network, and the 4G access network can include an evolved-universal terrestrial radio access network (evolved-universal terrestrial radio access network). network, E-UTRAN). In a 4G network, UE, E-UTRAN and EPC can form an evolved packet system (EPS). In the above-mentioned 4G core network, it may include mobility management entity (mobility management entity, MME), serving gateway (serving gateway, SGW), packet data network gateway (packet data network gateway, PGW), policy and charging rule functions ( policy and charging rules function, PCRF) and home subscription server (home subscriber server, HSS).

The above-mentioned 5G communication network may include a 5G access network (AN) and a 5G core network (5GC). Among them, the 5G access network may include the next generation radio access network (NG RAN). The 5G core network may include: AMF, user plane function (UPF), session management function (SMF), policy control function (PCF), unified data management (UDM) )Wait.

Among them, as shown in FIG. 1 , HSS and UDM can be deployed in one, represented by HSS+UDM. Specifically, the UDM function may be added to the HSS, or the HSS function may be added to the UDM, or the functions of the HSS and the UDM may be simultaneously implemented in another device. Of course, the HSS and the UDM may also be deployed separately, and the two are connected in communication, which is not limited in this embodiment of the present application.

PCRF and PCF can be deployed in one, expressed as PCRF+PCF. Specifically, the PCF function can be added to the PCRF, or the PCRF function can be added to the PCF, or the functions of the PCRF and the PCF can be simultaneously implemented in another device. Of course, the PCRF and the PCF may also be deployed separately, and the two are connected in communication, which is not limited in this embodiment of the present application.

SMF and PGW-C (PGW control plane function) can be deployed in one, represented by SMF+PGW-C. Specifically, the PGW-C function may be added to the SMF, or the SMF function may be added to the PGW-C, or the functions of the SMF and the PGW-C may be simultaneously implemented in another device. Of course, the SMF and the PGW-C may also be deployed separately, and the two are connected in communication, which is not limited in this embodiment of the present application.

UPF and PGW-U (PGW user plane function) can be deployed in one, represented by UPF+PGW-C. Specifically, the PGW-U function may be added to the UPF, or the UPF function may be added to the PGW-U, or the functions of the UPF and the PGW-U may be simultaneously implemented in another device. Certainly, the UPF and the PGW-U may also be deployed separately, and the two are connected in communication, which is not limited in this embodiment of the present application.

The above-mentioned 4G network and 5G network may also include other devices. For example, the 5G network may also include: network slice specific authentication and authorization function (network slice specific authentication and authorization function, NSSAAF), network slice selection function (network slice selection function) function, NSSF), authentication server function (authentication server function, AUSF), application function (application function, AF), data network (Definition Networks, DN), etc., which are not specifically limited in the embodiments of the present application.

In the above communication system, the UE can access the 5G core network through a 3rd generation partnership project (3GPP) technology and/or a non-3GPP technology. Specifically, the UE can access the 5G core network through 3GPP access network equipment, or can access the 5G core network through non-3GPP access network equipment and gateway equipment. In this embodiment of the present application, the non-3GPP access network device may be a wireless access point (WAP) in a wireless local area network (wireless local area networks, WLAN), a world interoperability for microwave access (world interoperability) for microwave access, WiMAX) access equipment, code division multiple access (code division multiple access, CDMA) network switches or routers, etc. The gateway device may be a non-3GPP interworking function (non-3GPP interworking function, N3IWF) or the like.

In the above communication system, UDM has the function of unified data management. Mainly responsible for managing contract data, user access authorization and other functions.

PCF has a policy control function, and is mainly responsible for policy decisions related to session, service flow charging policy, QoS bandwidth guarantee and policy. In this architecture, the PCFs connected to AMF and SMF correspond to AM PCF (PCF for Access and Mobility Control) and SM PCF (PCF for Session Management) respectively, which may not be the same PCF entity in actual deployment scenarios.

The SMF has a session management function, and mainly performs functions such as session management, execution of a control policy issued by the PCF, selection of a UPF, and allocation of an Internet Protocol (IP) address of the UE.

AMF has access and mobility management functions, mainly for mobility management, access authentication/authorization and other functions. In addition, it is also responsible for transferring user policies between UE and PCF.

UPF is a user plane functional entity. As an interface with the data network, UPF completes functions such as user plane data forwarding, session/flow-based charging statistics, and bandwidth limitation.

The functions of each interface are described as follows:

N7: The interface between the PCF and the SMF, used to deliver the control strategy of the packet data unit (packet data unit, PDU) session granularity and the service data flow granularity.

N3: Communication interface between UPF+PGW-U and NG-RAN.

N15: The interface between the PCF and the AMF, used for delivering UE policies and access control related policies.

N4: The interface between the SMF and the UPF, used to transmit information between the control plane and the user plane, including controlling the distribution of forwarding rules for the user plane, QoS control rules, traffic statistics rules, etc., and reporting of information on the user plane.

N11: The interface between the SMF and the AMF, used to transfer the PDU session tunnel information between the RAN and the UPF, the control message sent to the UE, the radio resource control information sent to the RAN, and the like.

N2: The interface between the AMF and the RAN, used to transmit radio bearer control information from the core network side to the RAN, etc.

N1: The interface between the AMF and the UE, irrespective of access, used to deliver QoS control rules to the UE, etc.

N8: The interface between the AMF and the UDM, used by the AMF to obtain the subscription data and authentication data related to access and mobility management from the UDM, and to register the UE's current mobility management related information to the UDM.

N10: an interface between the SMF and the UDM, used for the SMF to obtain the session management-related subscription data from the UDM, and the SMF to register the UE's current session-related information to the UDM.

N26: The interface between the MME and the AMF, which is used to transfer the mobility management state and the session management state between the source network and the target network during the interoperation process of the 4G network and the 5G network.

S6a: Communication interface between MME and HSS+UDM.

S11: The communication interface between the MME and the SGW.

S1-MME: Communication interface between MME and E-UTRAN.

S1-U: Communication interface between E-UTRAN and SGW.

S5-C: Communication interface of the control plane between SGW and SMF+PGW-C.

S5-U: the communication interface of the user plane between the SGW and the UPF+PGW-U.

It should be noted that the UE in this embodiment of the present application is a terminal device with a wireless communication function, which can be deployed on land, including indoor or outdoor, handheld, wearable, or vehicle-mounted; it can also be deployed on water (such as a ship). etc.); can also be deployed in the air (eg on airplanes, balloons, satellites, etc.). The above-mentioned terminal equipment can be a mobile phone (mobile phone), a tablet computer (Pad), a computer with a wireless transceiver function, a virtual reality (virtual reality, VR) terminal device, an augmented reality (augmented reality, AR) terminal device, industrial control (industrial) wireless terminal in control), wireless terminal in self-driving, wireless terminal in remote medical, wireless terminal in smart grid, wireless terminal in transportation safety Wireless terminals, wireless terminals in smart cities, wireless terminals in smart homes, and so on. The terminal device may also be a handheld device, vehicle-mounted device, wearable device, computing device, or other processing device connected to a wireless modem with wireless communication capabilities. Terminal devices may be called by different names in different networks, for example: terminal device, access terminal, subscriber unit, subscriber station, mobile station, mobile station, remote station, remote terminal, mobile equipment, user terminal, terminal, wireless communication equipment, user agent or user device, cellular telephone, cordless telephone, session initiation protocol (SIP) telephone, wireless local loop (WLL) station, personal digital assistant (PDA), 5G network or terminal equipment in future evolution network, etc.

In the communication system shown in FIG. 1 , the functions and interfaces of each device are only exemplary, and not all functions of each device are required when applied to the embodiments of the present application. All or part of the devices of the core network may be physical physical devices or virtualized devices, which are not limited herein. Certainly, the communication system in this embodiment of the present application may also include other devices not shown in FIG. 1 , which is not limited herein.

It should be noted that, in this embodiment of the present application, "and/or" is only an association relationship that describes an associated object, indicating that there may be three kinds of relationships. For example, A and/or B can mean that A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the present application, "a plurality" means two or more than two.

At present, because the initial coverage of 5G network is not as good as that of 4G network, operators generally support VoEF at the initial stage of network deployment, and then support VoNR after the coverage of 5G network is improved (for example, some operators clearly point out: For IMS voice services, It is relatively difficult to achieve full coverage of 5G networks. In order to avoid frequent handovers and maintain voice continuity, the 5G fallback VoLTE solution (VoEF) under the independent networking (standalone, SA) is initially adopted. After the 5G network coverage performance is fully improved, the Consider VoNR in due time). The premise of VoEF is that the UE's reporting capability to the network must support the evolved universal terrestrial radio access (E-UTRA) capability.

However, in some scenarios of the 4G network (such as the number of attach attempts specified in 3GPP protocol TS 24.301 reaches 5, etc.), the UE will disable its own E-UTRA capability, that is, the UE does not support E-UTRA. -UTRA capability, E-UTRA capability is also called S1 mode (S1 mode) or S1 mode capability (S1 mode capability). Then, when the UE disables its own S1 mode or E-UTRA capability, if the UE selects the network to the 5G network and initiates the registration process on the 5G network, it will inform the network that its own S1 mode or E-UTRA capability is disabled. enabled (disabled). Then, when the UE's S1 mode is disabled and the network does not support VoNR or VoEF-only, the UE cannot fall back to the 4G network, and the UE's IMS voice service will inevitably fail, affecting the user experience.

In order to solve the above problem, an embodiment of the present application provides a communication method, and the communication method can be applied to the 5G network in the above communication system, and the 5G network and the 4G network can be interoperable.

First, the concepts involved in the embodiments of the present application are described.

First, ability information. The capability information is used to indicate the support capability of VoNR (the support/the support capacity of VoNR) and/or the support capability of VoEF-only (the support/the support capacity of VoEF-only). Specifically, the support capability of VoNR means that the 5G network supports or does not support VoNR, and the support capability of VoEF-only refers to supporting VoEF-only or not supporting VoEF-only. Among them, non-VoEF-only support can also become non-VoEF support. -only.

Understandably, whether a network supports VoNR may refer to whether the access network equipment and/or core network equipment in the network supports VoNR; similarly, whether a network supports VoEF may refer to the access network equipment and/or core network equipment in the network. / or whether the core network device supports VoEF. In the above communication system, the access network equipment may be the base station of the 5G network (such as gNB), or may be the base station of the 4G network (such as eNB); the core network equipment may be the core network equipment of the 5G network (such as AMF), or It can be the core network equipment (such as MME) of the 4G network.

Second, VoEF-only. VoEF-only can be understood as only the EPS fallback carries IMS voice (ie, only VoEF), that is, the voice service is implemented only through the EPS fallback.

In some possible implementations, a 5G network may support VoEF by default. In this case, if the 5G network does not support VoNR, it may be understood as supporting VoEF-only, and if the 5G network supports VoNR, it may be understood as not supporting VoEF-only; or, The 5G network can have configurable scenarios that support VoNR and/or VoEF. At this time, the 5G network supporting VoEF-only can be understood as not supporting VoNR but supporting VoEF, and the 5G network not supporting VoEF-only can be understood as supporting VoNR and VoEF.

Of course, in the subsequent evolution of wireless communication technology, if the network can also support other voice access methods other than VoNR and VoEF, VoEF-only can be understood as the network does not support other 5G voice access methods except VoEF. .

The communication method provided by the embodiment of the present application will be described below with reference to the above-mentioned communication system. In the following, unless otherwise specified, the first network device takes the AMF (which may be referred to as AMF A) in the first 5G network as an example. The second network device takes the AMF (may be referred to as AMF F) in the second 5G network or the mobile switching center (mobile switching center, MSC) in the 2G network or the 3G network as an example. The third network device takes the IMS as an example, and the fourth network device takes the access network device of the first 5G network as an example, and the access network device of the first 5G network may be a base station (eg, gNB) of the 5G network.

FIG. 2 is a first schematic flowchart of a communication method in an embodiment of the present application. Referring to FIG. 2 , the communication method may include: S201 to S203.

S201. The UE sends a first registration request message to AMFA (ie, the first network device).

Exemplarily, after the UE selects the network to the first 5G network, it needs to initiate a registration process in the first 5G network. At this time, the UE executes S201 and sends a first registration request message, such as a registration request A message, to AMFA.

Optionally, the UE may carry a piece of indication information in the registration request A message, according to different assignments of the first indication information, to inform the network of the enabling state of the UE's first capability (that is, the S1 mode or the E-UTRA capability). Alternatively, in the scenario where the first capability is disabled, the UE may also carry an indication message in the registration request A to inform the network that the first capability of the UE is disabled; when the first capability is enabled (enabled) In the scenario, the registration request A does not carry any information to inform the network that the first capability of the UE is enabled. Furthermore, the UE may also carry no information in the registration request A in the scenario where the first capability is disabled, to inform the network that the first capability of the UE is disabled; in the scenario where the first capability is enabled An indication information is carried in the registration request A to inform the network that the first capability of the UE is enabled. Of course, the UE may also notify the network of the enabling status of the first capability itself by other means, which is not specifically limited in this embodiment of the present application.

S202, AMFA sends a first registration response message (which may be recorded as registration request A) to the UE.

Exemplarily, after receiving the registration request A message sent by the UE, AMFA responds to it, sends a first registration response message to the UE, such as a registration accept A message, and carries the first capability information in the registration accept A message, Wherein, the first capability information is used to indicate the support capability of VoNR and/or the support capability of VoEF-only. Then, after receiving the registration accept A message, the UE can learn the network capabilities of the first 5G network.

S203, the UE sends a first registration complete message (which may be recorded as a registration complete A message) to AMFA.

In some possible implementations, the registration request A message may include a 5G system network feature support information element (5GS network feature support IEI), and the 5G system network feature support information element includes the above-mentioned first capability information.

In some possible implementation manners, the first capability information may be implemented in but not limited to the following specific implementation manners:

The first is to indicate the support capability of VoNR through an indication field. When the first capability information is a first value, the first capability information is used to indicate that VoNR is supported; when the first capability information is a second value, the first capability information is used to indicate that VoNR is not supported; the first value and the second value different. For example, the first value takes 1 and the second value takes 0; or, the first value takes 0 and the second value takes 1.

Second, the support capability of VoEF-only is indicated through an indication field. When the first capability information is a third value, the first capability information is used to indicate that VoEF-only is supported; when the first capability information is a fourth value, the first capability information indicates that VoEF-only is not supported; the third value and the third value are used to indicate that VoEF-only is not supported. The four values are different, for example, the third value is 1, and the fourth value is 0; or, the third value is 0, and the fourth value is 1.

The third is to indicate the support capability of VoEF-only through two indication fields. The first capability information includes a first field and a second field. The first field is used to indicate the support capability of VoNR, and the second field is used to indicate the support capability of VoEF. Specifically, when the first field indicates that VoNR is not supported, and the second field indicates that VoEF is supported, the first capability information indicates that VoEF-only (or VoNR is not supported); when the first field indicates that VoNR is supported, the second field indicates that In VoEF, the first capability information indicates that VoEF-only is not supported (or VoNR is supported).

Fourth, the support capability of VoNR and VoEF-only is indicated by two indication fields. The first capability information includes a first field and a second field. The first field is used to indicate the support capability of VoNR, and the second field is used to indicate the support capability of VoEF. Specifically, when the first field indicates that VoNR is not supported and the second field indicates that VoEF is supported, the first capability information indicates that VoNR is not supported and VoEF-only is supported; when the first field indicates that VoNR is supported, and the second field indicates that VoEF is supported , the first capability information indicates that VoNR is supported and VoEF-only is not supported.

Certainly, the first capability information may also have other implementation manners, which are not specifically limited in this embodiment of the present application.

For example, the above-mentioned 5G system network feature support information element can be as shown in Table 1 below, then, the first capability information can be located in the fourth bit of the fifth octet (octet 5) of the 5G system network feature support information element and/or fifth.

Assuming that the first capability information is used to indicate the support capability of VoNR, then the first capability information may include IMS-VoNR-3GPP (ie IMS voice over NR over 3GPP access indicator) and/or IMS-VoNR-N3GPP (ie IMS voice over 3GPP access indicator) over NR over non-3GPP access indicator), where IMS-VoNR-3GPP is used to indicate the support capability of VoNR accessed through 3GPP (ie the support of IMS voice over NR over 3GPP access), IMS-VoNR-N3GPP is used for Indicates the support capability of VoNR via N3GPP access (ie the support of IMS voice over NR over non-3GPP access).

Then, when the value of IMS-VoNR-3GPP is 1, IMS-VoNR-3GPP indicates that the network supports VoNR accessed through 3GPP; when the value of IMS-VoNR-3GPP is 0, then IMS-VoNR-3GPP indicates that the network does not support VoNR. VoNR via 3GPP access. When the value of IMS-VoNR-N3GPP is 1, IMS-VoNR-N3GPP indicates that the network supports VoNR accessed through non-3GPP; when the value of IMS-VoNR-N3GPP is 0, then IMS-VoNR-N3GPP indicates that the network does not support VoNR. VoNR over non-3GPP access.

Table 1

Similarly, assuming that the first capability information is used to indicate the support capability of VoEF-only, then the first capability information may include IMS-VoEF-only-3GPP (IMS voice over EPS fallback only over 3GPP access indicator) and/or IMS-VoEF-only-3GPP (IMS voice over EPS fallback only over 3GPP access indicator) VoEF-only-N3GPP (IMS voice over EPS fallback only over non-3GPP access indicator), where IMS-VoEF-only-3GPP is used to indicate the support capability of VoEF-only accessed through 3GPP (ie the support of IMS voice over EPS fallback only over 3GPP access), IMS-VoEF-only-N3GPP is used to indicate the support of VoEF-only access via N3GPP (ie the support of IMS voice over EPS fallback only over non-3GPP access).

Then, when the value of IMS-VoEF-only-3GPP is 1, the IMS-VoEF-only-3GPP indicates that the network supports VoEF-only accessed through 3GPP; when the value of IMS-VoEF-only-3GPP is 0, the IMS -VoEF-only-3GPP indicates that the network does not support VoEF-only through 3GPP access. When the value of IMS-VoEF-only-N3GPP is 1, the IMS-VoEF-only-N3GPP indicates that the network supports VoEF-only accessed through non-3GPP; when the value of IMS-VoEF-only-N3GPP is 0, the IMS -VoEF-only-N3GPP indicates that the network does not support VoEF-only accessed through non-3GPP.

It can be seen from the above that, regardless of whether the UE's first capability is disabled, AMFA can carry the first capability information in the registration accept A message to inform the UE of the network's support capability, so that the UE can perform subsequent communications based on its own capabilities. process.

In a scenario where the first capability of the UE is disabled and the first capability information indicates that VoNR is not supported or VoEF-only is supported, the UE may perform any of the following registration procedures:

The first type, FIG. 3A is a schematic diagram of the first registration process of the UE in the embodiment of the present application. Referring to FIG. 3A , after S202 , the above method may further include S204 to S206 .

S204, the UE enables the first capability, and sends a second registration request message (which may be recorded as a registration request B message) to AMFA A.

The registration request B message may include first indication information, where the first indication information is used to indicate that the first capability is enabled.

In some possible implementations, the UE may include a non-access stratum (NAS) and an access stratum (AS). Then, S204 may include: the NAS layer enables the first capability, and instructs the AS layer to continue camping in the current cell; the AS layer sends a registration request B message to AMFA A in the current cell.

S205, AMFA sends a third registration response message (which may be recorded as a registration accept B message) to the UE.

S206, the UE sends a third registration complete message (which may be recorded as a registration complete B message) to AMFA.

Exemplarily, the UE learns through S201 to S203 that the first 5G network does not support VoNR or supports VoEF-only, and the UE knows that its first capability is disabled, then, in this scenario, if the UE initiates the IMS voice service, then IMS voice services are bound to fail. Therefore, in order to implement the voice service in this scenario, the UE can enable or re-enable its own first capability, and notify the network through the registration request B message. Next, AMFA responds to the UE, sends a registration accept B message to the UE, and carries the above-mentioned first capability information in registration accept B. In this way, the UE determines the first capability information according to the first capability information and the enabling state of its own first capability. A 5G network does not support VoNR or supports VoEF-only, and the UE's own first capability is enabled, send a registration complete B message to AMFA A to register with the first 5G network.

In some possible implementations, after the UE successfully registers with the first 5G network through the above-mentioned registration process, the UE can perform the IMS voice service on the first 5G network. Then, when the UE successfully completes the IMS voice service, the UE disables the first capability to meet the requirements of some scenarios of the above-mentioned 4G network.

The second type, FIG. 3B is a schematic diagram of the second registration process of the UE in the embodiment of the present application. Referring to FIG. 3B , after S202 , the above method may further include S207 to S209 .

S207, the UE sends a third registration request message (which may be recorded as a registration request C message) to the AMFC (that is, the second network device).

In some possible implementations, the registration request C message may include second indication information, where the second indication information is used to indicate that the first capability of the UE is disabled.

In some other possible implementation manners, the registration request C message may also not carry the second indication information, so as to indicate that the first capability of the UE is disabled.

It can be understood that the second 5G network and the first 5G network may belong to different public land mobile networks (public land mobile networks, PLMN) or cells under the PLMN, or may belong to different cells under the same PLMN.

S208, the AMFC sends a second registration response message (which may be recorded as a registration accept C message) to the UE.

The registration accept C message carries the second capability information, and the second capability information is used to indicate the support capability of the second 5G network for VoNR and the support capability for VoEF-only.

S209, the UE sends a second registration complete message (which may be recorded as a registration complete C message) to the AMFC.

Here, the registration request C message is similar to the registration accept A message. After receiving the registration request C message sent by the UE, the AMFC responds to the message, sends the registration accept C message to the UE, and carries the second capability information in the registration accept C message. , where the second capability information is used to indicate that VoNR is supported or VoEF-only is not supported. After receiving the registration accept C message, the UE can learn the network capabilities of the second 5G network, and send a registration complete C message to the AMFC to register on the second 5G network.

In some possible implementations, if the capability information indicates that the second 5G network does not support VoNR or supports VoEF-only, the UE may repeat S204 to S206 or S207 to S209 until it finds a network that supports VoNR or does not support VoEF-only 5G network, reside on the 5G network, and then register to the 5G network.

In the embodiment of this application, the UE knows through S201 to S203 that the first 5G network does not support VoNR or supports VoEF-only, and the UE knows that its first capability is disabled. In this scenario, if the UE initiates the IMS voice service, Then the IMS voice service will inevitably fail. Therefore, in order to implement the voice service in this scenario, the UE can select a new 5G network (ie, the second 5G network). Next, the AMFC sends a registration accept C message to the UE, and the registration accept C message Carrying the second capability information, the UE determines that the second 5G network supports VoNR or does not support VoEF-only according to the second capability information and the enablement of its own first capability, and the first capability of the UE is enabled. AMFC sends a registration complete C message to register with the second 5G network, thereby implementing the UE's voice service.

In some possible implementations, the UE may also maintain a PLMN list in the process of executing S207 to S209, and the PLMN list stores the network identifier of the 5G network that does not support VoNR or supports VoEF-only. In this way, the UE can only search for other 5G networks that are not in the above PLMN list when searching the network, and then initiate the registration process until the registration accept message issued by the network indicates that the current 5G network supports VoNR or does not support VoEF-only.

The third type, FIG. 3C is a schematic diagram of the third registration process of the UE in the embodiment of the present application. Referring to FIG. 3C , after S202 , the above method may further include S210 to S212 .

S210, the UE sends a fourth registration request message (which may be recorded as an attach request message) to the MSC (that is, the second network device).

S211, the MSC sends a fourth registration response message (which may be recorded as an attach accept message) to the UE.

S212, the UE sends a fourth registration complete message (which may be recorded as an attach complete message) to the MSC.

Exemplarily, the UE learns through S201 to S203 that the first 5G network does not support VoNR or supports VoEF-only, and the UE knows that its first capability is disabled. In this scenario, if the UE initiates the IMS voice service, the IMS voice The service will inevitably fail. Therefore, in order to implement the voice service in this scenario, the UE can choose to fall back to the 2G network or the 3G network to implement the voice service.

In some possible implementations, in the above S204 to S212, the above 5G network can be understood as a 5G PLMN, and can also be understood as an NR cell (5G cell) under the PLMN; a 2G network or a 3G network can be understood as a global mobile network A communication system (global system for mobile communications, GSM) PLMN or universal terrestrial radio access (universal mobile telecommunication system, UTRA) PLMN can also be understood as a GSM cell or a UTRA cell under the PLMN.

In some possible implementations, in some scenarios of the 4G network, the UE disables its own first capability, and the UE can also disable the N1 mode (N1mode) or the N1 mode capability (N1mode capability). During the period when the first capability of the UE is disabled, the N1 mode of the UE is also disabled, thereby avoiding ping-pong handover.

Further, when the UE disables the N1 mode or the N1 mode capability, the UE starts a timer; when the timer expires, the UE enables or re-enables the N1 mode or the N1 mode capability to restore the 5G capability of the UE.

In the embodiment of this application, the UE notifies the network that the first capability of itself is disabled during the registration process, and the network carries the first capability information of the first 5G network in the registration response message sent to the UE. Indicates that in a scenario where the first 5G network does not support VoNR or supports VoEF, the UE can perform the above registration process to register with the first 5G network, the second 5G network, the 2G network or the 3G network, thereby implementing the UE's voice service.

An embodiment of the present application further provides a communication method. FIG. 4 is a schematic flowchart of a second communication method in an embodiment of the present application. Referring to FIG. 4 , the communication method may include S401 to S403.

S401. The UE sends a registration request A message to AMFA.

Wherein, the registration request A message may include second indication information to inform the network that the first capability of the UE is disabled.

S402, AMFA sends a first registration rejection message (which may be recorded as a registration reject message) to the UE.

The registration reject message may include rejection reason information, where the rejection reason information is used to indicate that the first 5G network does not support VoNR or supports VoEF-only.

Exemplarily, during the registration process, the UE informs the network that its first capability is disabled through the registration request A message, and the first 5G network does not support VoNR or supports VoEF-only at this time, then AMFA rejects the registration of the UE. request, send a registration reject message to the UE, and carry the rejection reason information to inform the UE that the reason for rejecting the registration this time is because the first 5G network does not support VoNR or supports VoEF-only. In this way, after receiving the registration reject, the UE can perform the subsequent communication process.

Further, after the UE receives the registration reject message through S402, it may refer to the above-mentioned embodiment to perform any one of the registration procedures in S204 to S212, which will not be repeated here.

In the embodiment of the present application, the UE notifies the network that the first capability of itself is disabled during the registration process, and the network in the scenario where the first capability of the UE is disabled and the first 5G network does not support VoNR or supports VoEF, Reject the UE's registration request, and inform the UE that the registration fails because the first 5G network does not support VoNR or supports VoEF-only, so that the UE can perform the above registration process and register to the first 5G network, the second 5G network, the 2G network or the 3G network network, and then realize the voice service.

An embodiment of the present application further provides a communication method. FIG. 5 is a third schematic flowchart of the communication method in the embodiment of the present application. Referring to FIG. 5 , the method may include S501:

S501. The UE receives a first cancellation message (which may be recorded as a cancel A message) sent by the IMS (that is, the third network device).

The cancel A message is used to indicate the cancellation of the first IMS voice service of the UE, and the cancel A message includes service cancellation reason information, and the service cancellation reason information is that the first capability of the UE is disabled.

Exemplarily, if the first capability of the UE is disabled, the UE may notify the network that the first capability of the UE is disabled during the process of registering with the first 5G network. Then, when the UE needs to perform the IMS voice service, the UE triggers the first IMS voice service (which may be the IMS calling service or the IMS called service). At this time, the UE has registered in the IMS. After the IMS knows that the UE triggers the first IMS voice service, the IMS may cancel the current IMS voice service, that is, the first IMS voice service, because the UE's first capability is disabled. At this time, the IMS sends cancel A (the first cancellation message) to the UE, and cancel A includes service cancellation reason information.

In some possible implementations, taking the calling scene as an example, as shown by the solid line in FIG. 5 , before S501 , the method may further include S502a to S506a.

S502a, the UE sends a first message (such as an invite message) to the IMS.

The first message is used to trigger the first IMS voice service of the UE. When the UE needs to initiate a calling service, it sends an invite message to AMFA.

It should be noted that the sending mentioned here may refer to transparent transmission or forwarding by multiple network elements in the 5G core network, such as sending through SMF, PCF, P-CSCF, etc., which is not specifically limited.

S503a, the IMS sends a second message (such as a 200 OK/ACK message) to AMFA.

S504a: AMFA sends a fourth message (such as a PDU session resource modify request message) to the gNB (that is, the fourth network device).

Exemplarily, the AMFA may send a PDU session resource modify request message to the gNB to request the gNB to establish a quality of service flow (QoS flow) for the first IMS voice service.

S505a, the gNB sends the PDU fifth message (such as a PDU session resource modify response/reject message) to the AMFA.

The PDU session resource modify response/reject message includes failure cause information of the first IMS voice service, and the failure cause information indicates that the first capability of the UE is disabled. That is to say, because the first capability of the UE is disabled, the establishment of the QoS flow of the first IMS voice service fails.

Exemplarily, the gNB learns through the registration process that the first capability of the UE is disabled, and the first 5G network does not support VoNR or supports VoEF-only, then the gNB can send a PDU session resource modify response/reject message to AMFA, And inform AMFA through the failure cause information that the QoS flow establishment failed because the first capability of the UE was disabled.

S506a, AMFA sends failure cause information to the IMS.

Exemplarily, after receiving the PDU session resource modify response/reject message, AMFA carries the failure cause information in the message sent to the SMF, and then forwards it to the IMS by the SMF, PCF, and P-CSCF layers or, The AMFA may also carry the failure cause information in the third message and send it to the IMS. Then, after receiving the failure cause information, the IMS may execute S501, and send a cancel A message to the UE to cancel the first IMS voice service.

In some possible implementations, taking the called scene as an example, as shown by the dotted line in FIG. 5 , before S501 , the method may further include S502b to S507b.

S502b: The IMS sends an invite message to AMFA.

The sending mentioned here may refer to sending through multiple network elements in the 5G core network, such as sending through SMF, PCF, P-CSCF, etc., which is not specifically limited.

Exemplarily, when the calling UE needs to initiate a call, it can initiate a call on its own 5G network, and the IMS sends the invite to the 5GC of the called UE; if the UPF cannot connect to the UE, it sends a downlink data notification to the SMF. (downlink data notification, DDN) message; the SMF notifies the AMF of the downlink voice service of the called UE according to the DDN message.

S503b, AMFA sends a paging (paging) message to the UE.

Exemplarily, AMFA pages the UE, sends a paging message to the gNB to page the UE, and the gNB sends the paging message to the UE.

S504b, the UE sends a response message to AMFA.

S505b, AMF A sends a PDU session resource modify request message to the gNB.

The AMFA sends a PDU session resource modify request to the gNB to request the gNB to establish a quality of service flow (QoS flow) for the first IMS voice service.

S506b, gNB sends a PDU session resource modify response/reject message to AMFA.

Wherein, the PDU session resource modify response/reject message may include failure cause information of the first IMS voice service, and the failure cause information indicates that the first capability of the UE is disabled. That is, because the first capability of the UE is disabled, the establishment of the QoS flow of the first IMS voice service fails.

Exemplarily, the gNB learns through the registration process that the first capability of the UE is disabled, and the first 5G network does not support VoNR or supports VoEF-only, then the gNB can send a PDU session resource modify response/reject message to AMFA, And inform that the QoS flow establishment failed because the first capability of the UE was disabled.

S507b, AMFA sends failure cause information to the IMS.

Exemplarily, after receiving the PDU session resource modify response/reject message, the AMF A carries the failure cause information in the message sent to the SMF, and then forwards it to the IMS by the SMF, PCF, and P-CSCF layers; or, the AMF A may also carry the failure cause information in the third message and send it to the IMS. Then, after receiving the failure cause information, the IMS may execute S501, and send a cancel A message to the UE to cancel the first IMS voice service.

Further, after receiving the cancel A message through S501, the UE may perform any one of the registration procedures in S204 to S212 with reference to the foregoing embodiment, which will not be repeated here.

In the embodiment of the present application, the UE informs the network that its first capability is disabled during the registration process. Then, in the scenario where the first 5G network does not support VoNR or supports VoEF, after the UE triggers the first IMS voice service, The IMS sends a cancel A message to the UE because the first capability of the UE is disabled, and informs the UE of the failure reason of the first IMS voice service, so that the UE can perform the above registration process and register to the first 5G network, the second 5G network, 2G network or 3G network, and then realize the voice service.

An embodiment of the present application further provides a communication method, and FIG. 6 is a fourth schematic flowchart of the communication method in the embodiment of the present application. Referring to FIG. 6 , the method may include S601 to S602c.

S601. The gNB sends a sixth message (eg, a system message) to the UE.

The system information (system information message) may include third capability information, where the third capability information is used to indicate that VoNR is not supported or VoEF-only is supported.

Exemplarily, after the UE camps on an NR cell (that is, the current NR cell), the gNB sends system messages to the UE, such as a master information block (MIB), a system information block (SIB), and the like. When the gNB sends the system message, the system message may carry the capability information (ie, the third capability information) of the current NR cell.

Further, the UE may perform one of the following S602a and S602b according to the above system message.

S602a, the UE enables the first capability, and initiates a registration process in the current cell.

For the implementation process of S602a, reference may be made to the descriptions of S204 to S206 in the foregoing embodiment, and details are not repeated here.

S602b, the UE initiates a registration process in the first cell, and the first cell supports VoNR or does not support VoEF-only.

For the implementation process of S602b, reference may be made to the descriptions of S207 to S209 in the foregoing embodiment, and details are not repeated here.

S602c, the UE initiates a registration process in a second cell, where the second cell is a GSM cell or a UTRA cell.

For the implementation process of S602c, reference may be made to the descriptions of S210 to S212 in the foregoing embodiment, which will not be repeated here.

It should be noted that the above-mentioned current cell, the first cell and the second cell may be different cells under the same PLMN, or may be cells under different PLMNs.

In the embodiment of the present application, after the UE resides on the first 5G network, the gNB informs the first 5G network that it does not support VoNR or supports VoEF through a system message, and the first capability of the UE is disabled. Then, in such a scenario In this case, the UE can perform the above-mentioned registration process to register with the first 5G network, the second 5G network, the 2G network or the 3G network, thereby realizing the voice service.

An embodiment of the present application further provides a communication method. FIG. 7 is a schematic flowchart of a fifth type of the communication method in the embodiment of the present application. Referring to FIG. 7 , the method may include S701 to S702c.

S701. The IMS sends a second cancellation message (which may be recorded as a cancel B message) to the UE.

Wherein, the cancel B message is used to instruct to cancel the first IMS voice service of the UE;

Illustratively, S701 is similar to S501. If the first capability of the UE is disabled, in the process of registering with the first 5G network, the UE may notify the network that the first capability of the UE is disabled. Then, when the UE needs to perform the IMS voice service, the UE triggers the first IMS voice service, and at this time, the UE has registered in the IMS. After the IMS knows that the UE triggers the first IMS voice service, the IMS may cancel the current IMS voice service, that is, the first IMS voice service, because the first capability of the UE is disabled. At this time, the IMS sends a cancel B message to the UE, and the cancel B message includes service cancellation reason information.

Further, the UE may execute one of the following S702a, S702b and S702c according to the cancel B message.

S702a, when the number of times the UE receives the cancel (cancellation) message is equal to or greater than the preset threshold, and the QoS flow of the first IMS voice service is not established, the UE enables the first capability and sends registration request B to AMF A.

S702b, when the number of times that the UE receives the cancel message is equal to or greater than the preset threshold, and the QoS flow of the first IMS voice service is not established, the UE sends a registration request C to the AMFC.

S702c, when the number of times the UE receives the cancel message is equal to or greater than the preset threshold, and the QoS flow of the first IMS voice service is not established, the UE sends an attach request to the MSC.

In the above S702a, S702b and S702c, the number of times the UE receives the cancel message refers to the number of times the UE has received the cancel message cumulatively. Here, the cancel message is a cancel message for any IMS voice service of the UE.

In practical applications, the UE may maintain a counter, and each time a cancel message is received, the counter is incremented by one. The counter may not be set with an upper limit of the count, and after reading the count, the UE determines whether the current count is equal to or greater than the preset threshold; It is necessary to read whether the current count is cleared to determine whether the number of times the UE receives the cancel message is equal to or greater than the preset threshold. Of course, counting can also be implemented in other forms, which are not specifically limited in this embodiment of the present application.

In practical applications, the above-mentioned preset thresholds may be 5, 8, 10, etc., and may also be configured according to practical applications, which are not specifically limited in the embodiments of the present application.

Similar to S501, before S701, the above method further includes: the UE sends an invite message to the IMS; or, the UE receives an invite message from the IMS. For the specific implementation process, refer to the descriptions of S502a to S506a or S502b to S507b.

In some possible implementations, in some scenarios of the 4G network, the UE disables its own first capability, and the UE can also disable the N1 mode (N1 mode) or the N1 mode capability (N1 mode capability), so that , during the period when the first capability of the UE is disabled, the N1 mode of the UE is also disabled, thereby avoiding ping-pong handover.

Further, when the UE disables the N1 mode or N1 mode capability, the UE may start a timer; when the timer expires, the UE enables or re-enables the N1 mode or N1 mode capability to restore the 5G capability of the UE .

In the embodiment of the present application, the UE informs the network that its first capability is disabled during the registration process. Then, in the scenario where the first 5G network does not support VoNR or supports VoEF, after the UE triggers the first IMS voice service, The IMS sends a cancel B message to the UE because the UE's first capability is disabled. After receiving the cancel B, the UE determines whether the number of received cancels is equal to or greater than the preset threshold. If it is equal to or greater than the preset threshold, then The UE considers that the reason for the failure of its own IMS voice service is that the first capability of the UE is disabled. Next, the UE can perform the above registration process to register with the first 5G network, the second 5G network, the 2G network or the 3G network, and then realize voice business.

An embodiment of the present application further provides a communication method. FIG. 8 is a schematic flowchart of the sixth type of the communication method in the embodiment of the present application. Referring to FIG. 8 , the method may include S801 to S802.

S801, the UE sends a first message (such as an invite message) to AMFA.

S802. The UE enables the first capability.

It should be noted that the method shown in FIG. 8 can be applied to the scenario where the first capability of the UE is disabled. After the UE successfully registers in the first 5G network, when the UE wants to perform the IMS calling service, the steps can be executed. S801-S802, that is, the UE sends an invite to the AMFA and enables its own first capability.

In practical applications, the execution order of the above S801 and S802 is not specifically limited. For example, S801 and S802 may be executed simultaneously; or, S801 is executed first, and then S802 is executed; further, S802 is executed first, and then S801 is executed. The execution sequence of S801 and S802 is not specifically limited in this embodiment of the present application.

In some possible implementations, when the UE successfully completes the IMS voice service corresponding to the invite message, the UE disables the first capability to meet the requirements of certain scenarios of the above-mentioned 4G network.

In this embodiment of the present application, the UE does not need the network to notify its own first capability to be disabled, but enables the first capability by itself when or before initiating the IMS calling service, so that the UE can support VoNR or support Voice services are implemented in VoEF-only networks.

An embodiment of the present application further provides a communication method. FIG. 9 is a seventh schematic flowchart of the communication method in the embodiment of the present application. Referring to FIG. 9 , the method may include S901a, S901b, and S901c.

In some possible implementations, if the first capability of the UE is disabled and the UE is a voice center, the UE may perform one of S901a, S901b and S901c.

S901a, the UE enables the first capability, and sends a registration request B message to AMFA.

For the implementation process of S901a, reference may be made to the descriptions of S204 to S206 in the foregoing embodiment, and details are not repeated here.

S901b, the UE sends a registration request C message to the AMFC.

For the implementation process of S901b, reference may be made to the descriptions of S207 to S209 in the foregoing embodiment, which will not be repeated here.

S901c, the UE sends an attach request message to the MSC.

For the implementation process of S901c, reference may be made to the descriptions of S210 to S212 in the foregoing embodiment, and details are not repeated here.

In the embodiment of the present application, in the scenario where the UE's own first capability is disabled and the UE is a voice center, after the UE resides on the first 5G network, the UE can enable its own first capability, and then register to the The first 5G network is used to implement the voice service; or, the UE chooses to fall back to the 2G network or the 3G network to implement the voice service.

An embodiment of the present application provides a communication apparatus, and the communication apparatus may be a chip or a system-on-chip in a user equipment, and may also be a functional module in the user equipment for implementing the method described in any possible implementation manner of the foregoing embodiments . For example, FIG. 10 is a schematic structural diagram of a communication device in an embodiment of the present application. Referring to the solid line shown in FIG. 10 , the communication device 100 includes: a sending module 11 for sending a first registration request message; a receiving module 12 , used to receive a first registration response message from the first network device, where the first registration response message includes first capability information; wherein, the first capability information is used to indicate VoNR support capability and/or VoEF-only support capability .

In some other possible implementation manners, if the first capability of the user equipment is disabled, and the first capability information indicates that VoNR is not supported or VoEF-only is supported, as shown by the dotted line in FIG. 10 , the above apparatus further includes: a processing module 13, used to enable the first capability; the sending module is further configured to send a second registration request message to the first network device, wherein the second registration request message includes first indication information, and the first indication information is used to indicate the first Capabilities are enabled, the first capability being S1 mode and/or E-UTRA capability.

In some other possible implementation manners, if the first capability of the user equipment is disabled, and the first capability information indicates that VoNR is not supported or VoEF-only is supported; the sending module is further configured to send the third network device to the second network device. a registration request message; the receiving module is further configured to receive a second registration response message from the second network device, the second registration response message includes second capability information, the second capability information indicates that VoNR is supported or VoEF-only is not supported, and the second The network device is located in the second 5G network, and the second network device may be an AMF in the second 5G network.

In other possible implementations, the processing module is configured to disable the first capability; disable the N1 mode.

An embodiment of the present application provides a communication apparatus, and the communication apparatus may be a chip or a system-on-chip in a first network device, and may also be the first network device for implementing any possible implementation manner in the foregoing embodiments. method of the function module. For example, still referring to the solid line shown in FIG. 10 , the communication apparatus 100 includes: a receiving module 12 for receiving a first registration request message from a user equipment; a sending module 13 for sending a first registration request message to the user equipment In the response message, the first registration response message includes first capability information; wherein, the first capability information is used to indicate the VoNR support capability and/or the VoEF-only support capability.

An embodiment of the present application provides a communication apparatus, and the communication apparatus may be a chip or a system-on-chip in a user equipment, and may also be a functional module in the user equipment for implementing the method described in any possible implementation manner of the foregoing embodiments . For example, still referring to the solid line shown in FIG. 10, the communication device 100 includes: a sending module 11, configured to send a first registration request message to the first network device, the first registration request message includes the second indication information, the first registration request message The second indication information is used to indicate that the first capability of the user equipment is disabled, and the first capability is the S1 mode and/or the E-UTRA capability; the receiving module 12 is configured to receive the first registration rejection message sent by the first network device, The first registration rejection message includes rejection reason information, where the rejection reason information is used to indicate that the first 5G network does not support VoNR or supports VoEF-only.

In some possible implementations, still referring to the dotted line in FIG. 10 , the above apparatus 100 further includes: a processing module 13, configured to enable the first capability; a sending module, further configured to send a second registration request to the first network device message, the second registration request message includes first indication information, where the first indication information is used to indicate that the first capability of the user equipment is enabled.

An embodiment of the present application provides a communication device, and the communication device may be a chip or a system-on-chip in a first network device, and may also be a device in the first network device for implementing any possible implementation manner in the foregoing embodiments. The function module of the method. For example, still referring to the solid line shown in FIG. 10 , the communication apparatus 100 includes: a receiving module 12, configured to receive a first registration request message from the user equipment, the first registration request message includes second indication information, and the second The indication information is used to indicate that the first capability of the user equipment is disabled, and the first capability is the S1 mode and/or the E-UTRA capability; the sending module 11 is used to send a first registration rejection message to the user equipment, the first registration rejection The message includes rejection reason information, which is used to indicate that the first 5G network does not support VoNR or supports VoEF-only.

An embodiment of the present application provides a communication apparatus, and the communication apparatus may be a chip or a system-on-chip in a user equipment, and may also be a functional module in the user equipment for implementing the method described in any possible implementation manner of the foregoing embodiments . For example, still referring to the solid line shown in FIG. 10 , the communication apparatus 100 includes: a receiving module 12, configured to receive a first cancellation message sent by a third network device; wherein the first cancellation message is used to instruct the cancellation of the user equipment The first IMS voice service of the user equipment, the first cancellation message includes service cancellation reason information, the service cancellation reason information is that the first capability of the user equipment is disabled, and the first capability is the S1 mode or the E-UTRA capability.

In some possible implementations, still referring to the solid line shown in FIG. 10 , the foregoing apparatus 100 further includes: a sending module 11, configured to send a first message to a third network device, where the first message is used to trigger the first IMS voice service or, the receiving module is further configured to receive the first message from the third network device.

In some other possible implementation manners, still referring to the dotted line shown in FIG. 10 , the foregoing apparatus 100 further includes: a processing module 13, configured to disable the first capability when the user equipment successfully completes the IMS voice service.

In some other possible implementation manners, the above apparatus further includes: a processing module configured to disable the first capability; and disable the N1 mode.

An embodiment of the present application provides a communication device, and the communication device may be a chip or a system-on-chip in a third network device, and may also be a third network device for implementing any possible implementation manner in the foregoing embodiments. The function module of the method. For example, still referring to the solid line shown in FIG. 10 , the communication apparatus 100 includes: a sending module 11, configured to send a first cancellation message to the user equipment; wherein, the first cancellation message is used to instruct to cancel the first cancellation of the user equipment For the IMS voice service, the first cancellation message includes failure cause information of the first IMS voice service, and the failure cause information is used to indicate that the first capability of the user equipment is disabled, and the first capability is the S1 mode or the E-UTRA capability.

In some possible implementations, still referring to the solid line shown in FIG. 10 , the above apparatus 100 further includes: a receiving module 12, configured to receive a first message from the user equipment, where the first message is used to trigger the first IMS voice service; Alternatively, the sending module is further configured to send the first message to the user equipment.

An embodiment of the present application provides a communication device, and the communication device may be a chip or a system-on-chip in a fourth network device, and may also be a fourth network device for implementing any possible implementation manner in the foregoing embodiments. The function module of the method. For example, referring to the solid line shown in FIG. 10 , the communication apparatus 100 includes: a receiving module 12, configured to receive a fourth message from the first network device, where the fourth message is used to request the first IMS voice of the user equipment The service establishes a QoS flow; the sending module 11 is configured to send a fifth message to the first network device, where the fifth message includes failure cause information of the first IMS voice service, and the failure cause information is used to indicate that the first capability of the user equipment is disabled Yes, the first capability is S1 mode or E-UTRA capability.

An embodiment of the present application provides a communication apparatus, and the communication apparatus may be a chip or a system-on-chip in a user equipment, and may also be a functional module in the user equipment for implementing the method described in any one of the foregoing embodiments. For example, as shown in FIG. 10, the communication apparatus 100 includes: a receiving module 12, configured to receive a sixth message from a fourth network device, the sixth message includes third capability information, and the third capability information is used to indicate The current cell of the user equipment does not support VoNR or supports VoEF-only, the first capability of the user equipment is disabled, and the first capability is the S1 mode or the E-UTRA capability; the processing module 13 is used to enable the first capability; send The module 11 is used for initiating the registration process in the current cell; initiating the registration process in the first cell, the first cell supports VoNR or does not support VoEF-only; the sending module 11 is further used for initiating the registration process in the second cell, the second cell It is a GSM cell or a UTRA cell.

An embodiment of the present application provides a communication apparatus, and the communication apparatus may be a chip or a system-on-chip in a user equipment, and may also be a functional module in the user equipment for implementing the method described in any possible implementation manner of the foregoing embodiments . For example, referring to the solid line shown in FIG. 10, the communication apparatus 100 includes: a sending module 11, configured to send a sixth message to the user equipment, where the sixth message includes third capability information, and the third capability information is used to represent the user The current cell of the device does not support VoNR or supports VoEF-only, the first capability of the user equipment is disabled, and the first capability is the S1 mode or the E-UTRA capability.

An embodiment of the present application provides a communication apparatus, and the communication apparatus may be a chip or a system-on-chip in a user equipment, and may also be a functional module in the user equipment for implementing the method described in any possible implementation manner of the foregoing embodiments . For example, as shown in FIG. 10 , the communication apparatus 100 includes: a receiving module 12, configured to receive a second cancellation message from a third network device, where the second cancellation message is used to instruct to cancel the first IMS voice of the user equipment service, the first capability of the user equipment is disabled, and the first capability is the S1 mode or the E-UTRA capability; the processing module 13 is used for when the number of times the user equipment receives the cancellation message is equal to or greater than the preset threshold, and the first capability is When the QoS flow of the IMS voice service is not established, the first capability is enabled; the sending module 11 is configured to send a second registration request message to the first network device, where the second registration request message includes the first indication information, and the first indication information is used for In order to indicate that the first capability is enabled; or, the sending module 11 is also used to send a message to the second when the number of times the user equipment receives the cancellation message is equal to or greater than the preset threshold, and the QoS flow of the first IMS voice service is not established. The network device sends a third registration request message, the second network device is located in the second 5G network, and the second 5G network supports VoNR or does not support VoEF-only; or, when the number of times the user equipment receives the cancellation message is equal to or greater than the preset threshold , and when the QoS flow of the first IMS voice service is not established, a fourth registration request message is sent to the second network device, and the second network device is located in the 2G network or the 3G network.

An embodiment of the present application provides a communication apparatus, and the communication apparatus may be a chip or a system-on-chip in a user equipment, and may also be a function in the user equipment for implementing the method described in any possible implementation manner of the foregoing embodiments module. For example, as shown in FIG. 10, the communication apparatus 100 includes: a sending module 11, configured to send a first message to a first network device, where the first message is used to trigger the IMS voice service, and the first capability of the user equipment is To enable, the first capability is the S1 mode capability or the E-UTRA capability; the processing module 13 is configured to enable the first capability.

In some other possible implementations, the processing module is further configured to disable the first capability when the user equipment successfully completes the IMS voice service.

An embodiment of the present application provides a communication apparatus, and the communication apparatus may be a chip or a system-on-chip in a user equipment, and may also be a function in the user equipment for implementing the method described in any possible implementation manner of the foregoing embodiments module. For example, as shown in FIG. 10, the communication apparatus 100 includes: a processing module 13 and a sending module 11; the processing module 13 is used for if the first capability of the user equipment is disabled, and the user equipment is a voice center, The first capability is enabled; the sending module 11 is configured to send a second registration request message to the first network device, where the second registration request message includes first indication information, and the first indication information is used to indicate that the first capability is enabled, The first network device is located in the first 5G network, and the first capability is the S1 mode capability or the E-UTRA capability; or, the sending module 11 is also used if the first capability of the user equipment is disabled, and the user equipment is a voice The center sends a third registration request message to the second network device, the second network device is located in the second 5G network, and the second 5G network VoNR or does not support VoEF-only; or, the sending module 11 is also used if the user equipment The first capability of the device is disabled, and the user equipment is a voice center, a fourth registration request message is sent to the second network device, and the second network device is located in the 2G network or the 3G network.

In one or more of the above embodiments, the sending module 11 may be a sending circuit, a sending interface or a transmitter; the receiving module 12 may be a receiving circuit, a receiving interface or a receiver; and the processing module 13 may be one or more processors.

The embodiments of the present application further provide a communication apparatus, which may be an AMF, an access network device, or an IMS, and is configured to perform the method steps of the AMFA, gNB, or IMS described in one or more of the foregoing embodiments, respectively. FIG. 11 is a schematic diagram of hardware of the AMF, access network equipment, and IMS in an embodiment of the present application. Referring to FIG. 11 , the communication apparatus provided by the embodiment of the present application may include: a processor 1101 and a memory 1102 ; and may also include a bus 1103 , an input device 1104 and an output device 1105 .

Optionally, when the communication device is located in the AMF or is an AMF, the processor 1101 may be configured to execute the code or application program stored in the memory 1102 to implement the steps of the AMF in the above method embodiments. For the specific execution process, refer to the foregoing embodiment, and details are not repeated here.

Optionally, when the communication apparatus is located in an access network device or is an access network device, the processor 1101 may be configured to execute the code or application program stored in the memory 1102 to implement the access network device in the above method embodiments. (eg, gNB). For the specific execution process, refer to the foregoing embodiment, and details are not repeated here.

Optionally, when the communication device is located in the IMS or is an IMS, the processor 1101 may be configured to execute codes or applications stored in the memory 1102 to implement the steps of the IMS in the above method embodiments. For the specific execution process, refer to the foregoing embodiment, and details are not repeated here.

In some possible implementations, memory 1102 may include computer storage media in the form of volatile and/or non-volatile memory, such as read-only memory and/or random access memory. The memory 1102 may store operating systems, application programs, other program modules, executable code, program data, user account opening data, user subscription data, and the like.

Further, input device 1104 may be used to receive commands and information. Input device 1104 may be connected to processor 1101 through bus 1103 .

Further, the output device 1105 can be used for outputting information. In addition to the monitor, the output device 1105 can also be other peripheral output devices, and the output device 1105 can also be connected to the processor 1101 through the bus 703 .

In addition, the above-mentioned memory 1102 stores computer-executed instructions for realizing the functions of the sending module 11, the receiving module 12 and/or the processing module 13 in FIG. 10 . The functions/implementation process of the sending module 11, the receiving module 12 and/or the processing module 13 in FIG. 10 can all be implemented by the processor 1101 in FIG. 11 calling the computer execution instructions stored in the memory 1102, and the specific implementation process and function refer to The above-mentioned related embodiments.

It will be appreciated that Figure 11 only shows a simplified design of the communication device. In practical applications, AMF, access network equipment, and IMS may include any number of transmitters, receivers, processors, controllers, memories, communication units, etc., all of which can implement the AMF, Both the network access device and the IMS are within the protection scope of the embodiments of the present application.

The embodiments of the present application provide a computer-readable storage medium, where the computer-readable storage medium stores instructions, which are used to execute the communication methods described in the foregoing embodiments and any possible implementation manners thereof when the instructions are executed on a computer.

The embodiments of the present application provide a computer program or computer program product, which, when executed on a computer, enables the computer to implement the communication method described in the foregoing embodiments and any possible implementation manners thereof.

Those skilled in the art will appreciate that the functions described in connection with the various illustrative logical blocks, modules, and algorithm steps described in this disclosure may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions described by the various illustrative logical blocks, modules, and steps may be stored on or transmitted over as one or more instructions or code on a computer-readable medium and executed by a hardware-based processing unit. Computer-readable media may include computer-readable storage media, which corresponds to tangible media, such as data storage media, or communication media including any medium that facilitates transfer of a computer program from one place to another (eg, according to a communication protocol) . In this manner, a computer-readable medium may generally correspond to (1) a non-transitory tangible computer-readable storage medium, or (2) a communication medium such as a signal or carrier wave. Data storage media can be any available media that can be accessed by one or more computers or one or more processors to retrieve instructions, code and/or data structures for implementing the techniques described in this application. The computer program product may comprise a computer-readable medium.

By way of example and not limitation, such computer-readable storage media may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage devices, magnetic disk storage devices or other magnetic storage devices, flash memory, or may be used to store instructions or data structures. desired program code in the form of any other medium that can be accessed by a computer. Also, any connection is properly termed a computer-readable medium. For example, if a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave are used to transmit instructions from a website, server, or other remote source, then the coaxial cable Wire, fiber optic cable, twisted pair, DSL or wireless technologies such as infrared, radio and microwave are included in the definition of media. It should be understood, however, that computer-readable storage media and data storage media do not include connections, carrier waves, signals, or other transitory media, but are instead directed to non-transitory, tangible storage media. As used herein, magnetic disks and optical disks include compact disks (CDs), laser disks, optical disks, digital versatile disks (DVDs), and Blu-ray disks, where disks typically reproduce data magnetically, while disks reproduce optically with lasers data. Combinations of the above should also be included within the scope of computer-readable media.

may be processed by one or more of, for example, one or more digital signal processors (DSPs), general purpose microprocessors, application specific integrated circuits (ASICs), field programmable logic arrays (FPGAs), or other equivalent integrated or discrete logic circuits to execute the instruction. Accordingly, the term "processor," as used herein may refer to any of the foregoing structure or any other structure suitable for implementation of the techniques described herein. Additionally, in some aspects, the functions described by the various illustrative logical blocks, modules, and steps described herein may be provided within dedicated hardware and/or software modules configured for encoding and decoding, or in combination with into the combined codec. Furthermore, the techniques may be fully implemented in one or more circuits or logic elements.

The techniques of this application may be implemented in a wide variety of devices or apparatuses, including a wireless handset, an integrated circuit (IC), or a set of ICs (eg, a chip set). Various components, modules, or units are described herein to emphasize functional aspects of means for performing the disclosed techniques, but do not necessarily require realization by different hardware units. Indeed, as described above, the various units may be combined in codec hardware units in conjunction with suitable software and/or firmware, or by interoperating hardware units (including one or more processors as described above) supply.

In the above-mentioned embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

The above is only an exemplary embodiment of the present application, but the protection scope of the present application is not limited to this. Substitutions should be covered within the protection scope of this application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

A method of communication comprising:

The user equipment sends a first registration request message to a first network device, where the first network device is located in the first 5G network;

receiving, by the user equipment, a first registration response message from the first network device, where the first registration response message includes first capability information;

Wherein, the first capability information is used to indicate the support capability of the new wireless NR bearer Internet Protocol Multimedia Subsystem IMS voice VoNR and/or the Evolved Packet System Fallback-only EPS fallback bearer IMS voice VoEF-only support capability.
The method according to claim 1, wherein the first registration response message includes a 5G system network characteristic support information element, and the 5G system network characteristic support information element includes the first capability information.
According to the method of claim 1 or 2, the first capability information is located in the fourth bit and/or the fifth bit of the fifth octet of the 5G system network characteristic support information element.
The method according to any one of claims 1 to 3, when the first capability information is a first value, the first capability information is used to indicate that VoNR is supported; when the first capability information is a second value , the first capability information is used to indicate that VoNR is not supported.
The method according to any one of claims 1 to 3, when the first capability information is a third value, the first capability information is used to indicate that VoEF-only is supported; when the first capability information is the third value When the value is four, the first capability information indicates that VoEF-only is not supported.
The method according to any one of claims 1 to 3, wherein the first capability information includes a first field and a second field, the first field is used to indicate the support capability of the current network VoNR, the second field The field is used to indicate the support capability of EPS fallback bearing IMS voice VoEF.
The method according to claim 6, when the first field indicates that VoNR is not supported and the second field indicates that VoEF is supported, the first capability information indicates that VoNR is not supported or VoEF-only is supported; A field indicates that VoNR is supported, and the second field indicates that when VoEF is supported, the first capability information indicates that VoNR is supported or VoEF-only is not supported.
The method according to any one of claims 1 to 7, if the first capability of the user equipment is disabled, and the first capability information indicates that VoNR is not supported or VoEF-only is supported, the method further includes :

The user equipment enables the first capability, and sends a second registration request message to the first network device, where the second registration request message includes first indication information, and the first indication information is used for Indicates that the first capability is enabled, the first capability being S1 mode and/or E-UTRA capability for Evolved Universal Terrestrial Radio Access.
The method according to any one of claims 1 to 7, if the first capability of the user equipment is disabled, and the first capability information indicates that VoNR is not supported or VoEF-only is supported, wherein the first capability is One capability is S1 mode and/or E-UTRA capability;

The method also includes:

sending, by the user equipment, a third registration request message to the second network device;

The user equipment receives a second registration response message from the second network device, the second registration response message includes second capability information, the second capability information indicates that VoNR is supported or VoEF-only is not supported, the The second network device is located in the second 5G network.
The method according to any one of claims 1 to 7, if the first capability of the user equipment is disabled, and the first capability information indicates that VoNR is not supported or VoEF-only is supported, wherein the first capability One capability is S1 mode and/or E-UTRA capability;

The method also includes:

The user equipment sends a fourth registration request message to a second network device, where the second network device is located in a 2G or 3G network.
The method according to any one of claims 8 to 10, further comprising:

disabling, by the user equipment, the first capability;

The user equipment disables the N1 mode.
A method of communication comprising:

The first network device receives the first registration request message from the user equipment, and the first network device is located in the first 5G network;

sending, by the first network device, a first registration response message to the user equipment, where the first registration response message includes first capability information;

Wherein, the first capability information is used to indicate the support capability of the new wireless NR bearer Internet Protocol Multimedia Subsystem IMS voice VoNR and/or the Evolved Packet System Fallback-only EPS fallback bearer IMS voice VoEF-only support capability.
The method according to claim 12, wherein the first registration response message includes a 5G system network characteristic support information element, and the 5G system network characteristic support information element includes the first capability information.
According to the method of claim 12 or 13, the first capability information is located in the fourth bit and/or the fifth bit of the fifth octet of the 5G system network characteristic support information element.
The method according to any one of claims 12 to 14, when the first capability information is a first value, the first capability information is used to indicate that VoNR is supported; when the first capability information is a second value , the first capability information is used to indicate that VoNR is not supported.
The method according to any one of claims 12 to 14, when the first capability information is a third value, the first capability information is used to indicate that VoEF-only is supported; when the first capability information is the third value When the value is four, the first capability information indicates that VoEF-only is not supported.
The method according to any one of claims 12 to 14, wherein the first capability information includes a first field and a second field, the first field is used to indicate the support capability of the current network VoNR, the second field The field is used to indicate the support capability of EPS fallback bearing IMS voice VoEF.
The method according to claim 17, when the first field indicates that VoNR is not supported and the second field indicates that VoEF is supported, the first capability information indicates that VoNR is not supported or VoEF-only is supported; A field indicates that VoNR is supported, and the second field indicates that when VoEF is supported, the first capability information indicates that VoNR is supported or VoEF-only is not supported.
A method of communication comprising:

The user equipment sends a first registration request message to the first network device, where the first registration request message includes second indication information, and the second indication information is used to indicate that the first capability of the user equipment is disabled, so The first capability is S1 mode and/or E-UTRA capability, and the first network device is located in the first 5G network;

The user equipment receives a first registration rejection message sent by the first network device, where the first registration rejection message includes rejection reason information, where the rejection reason information is used to indicate that the first 5G network does not support new wireless NR Bearing the Internet Protocol Multimedia Subsystem IMS voice VoNR or supporting only the evolved packet system fallback EPS fallback bears IMS voice VoEF-only.
The method of claim 19, further comprising:

The user equipment enables the first capability, and sends a second registration request message to the first network device, where the second registration request message includes first indication information, and the first indication information is used to indicate the The first capability of the user equipment is enabled.
The method of claim 19, further comprising:

sending, by the user equipment, third registration request information to a second network device, where the second network device is located in a second 5G network;

The user equipment receives a second registration response message from the second network device, the second registration response message includes second capability information, and the second capability information indicates that the new wireless NR bears the Internet Protocol Multimedia Subsystem IMS Voice VoNR or VoEF-only is not supported.
The method of claim 19, further comprising:

The user equipment sends a fourth registration request message to a second network device, where the second network device is located in a 2G or 3G network.
The method of any one of claims 19 to 22, further comprising:

disabling, by the user equipment, the first capability;

The user equipment disables the N1 mode.
A method of communication comprising:

The first network device receives a first registration request message from the user equipment, where the first registration request message includes second indication information, where the second indication information is used to indicate that the first capability of the user equipment is disabled, The first capability is S1 mode and/or E-UTRA capability, and the first network device is located in the first 5G network;

The first network device sends a first registration rejection message to the user equipment, where the first registration rejection message includes rejection reason information, and the rejection reason information is used to indicate that the first 5G network does not support a new wireless NR bearer Internet Protocol Multimedia Subsystem IMS Voice VoNR or support only Evolved Packet System Fallback EPS fallback to carry IMS Voice VoEF-only.
A method of communication comprising:

The user equipment receives the first cancellation message sent by the third network device;

The first cancellation message is used to instruct to cancel the first Internet Protocol Multimedia Subsystem IMS voice service of the user equipment, the first cancellation message includes service cancellation reason information, and the service cancellation reason information is the user The first capability of the device is disabled, the first capability of the user equipment is disabled, and the first capability is an S1 mode or an E-UTRA capability for Evolved Universal Terrestrial Radio Access.
The method of claim 25, further comprising:

sending, by the user equipment, a first message to the third network device, where the first message is used to trigger the first IMS voice service; or,

The user equipment receives the first message from the third network device.
The method according to claim 25 or 26, wherein the user equipment includes an access AS layer and a non-access NAS layer; the method further comprises:

The NAS layer enables the first capability and instructs the AS layer to continue camping on the current cell.
The method of claim 27, further comprising:

When the user equipment successfully completes the IMS voice service, the user equipment disables the first capability.
The method of claim 25 or 26, further comprising:

The user equipment initiates a registration process in a first cell, where the first cell is an NR cell that supports new wireless NR to carry IMS voice VoNR or an NR cell that does not support EPS fallback to carry IMS voice VoEF-only; or ,

The user equipment initiates a registration process in a second cell, where the second cell is a Global System for Mobile Communications GSM cell or a Global Terrestrial Radio Access UTRA cell.
The method of any one of claims 25 to 29, further comprising:

disabling, by the user equipment, the first capability;

The user equipment disables the N1 mode.
The method of claim 30, further comprising:

When the user equipment disables the N1 mode, the user equipment starts a timer;

When the timer expires, the user equipment enables the N1 mode.
A communication device comprising:

The third network device sends the first cancellation message to the user equipment;

The first cancellation message is used to instruct to cancel the first Internet Protocol Multimedia Subsystem IMS voice service of the user equipment, and the first cancellation message includes failure cause information of the first IMS voice service, and the failure The reason information is used to indicate that the first capability of the user equipment is disabled, the first capability of the user equipment is disabled, and the first capability is the S1 mode or E-UTRA capability. .
The method of claim 32, further comprising:

receiving, by the third network device, a first message from the user equipment, where the first message is used to trigger the first IMS voice service; or,

The third network device sends the first message to the user equipment.
A method according to claim 32 or 33, the method comprising:

The third network device sends a second message to the first network device, where the second message is used to trigger the establishment of a quality of service flow QoS flow for the first IMS voice service.
A method according to claims 32 to 34, comprising:

The third network device receives third information from the first network device, the third message is used to trigger sending the first cancellation message to the user equipment, and the third message includes the failure reason information.
A method of communication comprising:

The fourth network device receives a fourth message from the first network device, where the fourth message is used to request the establishment of a quality of service flow QoS flow for the first Internet Protocol Multimedia Subsystem IMS voice service of the user equipment;

The fourth network device sends a fifth message to the first network device, where the fifth message includes failure cause information of the first IMS voice service, and the failure cause information is used to indicate the first A capability is disabled, the first capability being an S1 mode or E-UTRA capability for Evolved Universal Terrestrial Radio Access.
A method of communication comprising:

The user equipment receives a sixth message from the fourth network device, where the sixth message includes third capability information, and the third capability information is used to indicate that the current cell of the user equipment does not support the new wireless NR to carry the Internet Protocol Multimedia Subsystem. System IMS voice VoNR or support only evolved packet system fallback EPS fallback bears IMS voice VoEF-only, the first capability of the user equipment is disabled, and the first capability is S1 mode or Evolved Universal Terrestrial Radio Access E- UTRA capability;

The user equipment performs one of the following steps according to the sixth message:

enabling the first capability by the user equipment, and initiating a registration process in the current cell;

The user equipment initiates a registration process in a first cell, and the first cell supports VoNR or does not support VoEF-only;

The user equipment initiates a registration process in a second cell, where the second cell is a Global System for Mobile Communications GSM cell or a Global Terrestrial Radio Access UTRA cell.
The method of claim 37, wherein the user equipment comprises an access AS layer and a non-access NAS layer;

Enabling, by the user equipment, the first capability includes: enabling, by the NAS layer, the first capability;

The method further includes: the NAS layer instructing the AS layer to continue camping on the current cell.
A method of communication comprising:

The fourth network device sends a sixth message to the user equipment, where the sixth message includes third capability information, where the third capability information is used to indicate that the current cell of the user equipment does not support the new wireless NR bearer Internet Protocol Multimedia Subsystem IMS voice VoNR or support only evolved packet system fallback EPS fallback bears IMS voice VoEF-only, the first capability of the user equipment is disabled, and the first capability is S1 mode or Evolved Universal Terrestrial Radio Access E-UTRA ability.
A method of communication comprising:

The user equipment receives a second cancellation message from the third network device, where the second cancellation message is used to instruct cancellation of the first Internet Protocol Multimedia Subsystem IMS voice service of the user equipment, and the first capability of the user equipment is removed. enabled, the first capability is the S1 mode or the E-UTRA capability of Evolved Universal Terrestrial Radio Access;

When the number of times the user equipment receives the cancellation message is equal to or greater than a preset threshold, and the quality of service flow QoS flow of the first IMS voice service is not established, the user equipment enables the first capability and sends a message to the user equipment. The first network device sends a second registration request message, where the second registration request message includes first indication information, where the first indication information is used to indicate that the first capability is enabled, and the first network device is located in the a 5G network; or,

When the number of times the user equipment receives cancellation messages is equal to or greater than a preset threshold, and the QoS flow of the first IMS voice service is not established, the user equipment sends a third registration request to the second network device message, the second network device is located in the second 5G network, and the second 5G network supports the new wireless NR bearer of the Internet Protocol Multimedia Subsystem IMS voice VoNR or does not support only the evolved packet system fallback EPS fallback bears IMS voice VoEF-only ;or,

When the number of times the user equipment receives the cancellation message is equal to or greater than the preset threshold, and the QoS flow of the first IMS voice service is not established, the user equipment sends a fourth registration request to the second network device message, the second network device is located in a 2G network or a 3G network.
The method of claim 40, further comprising:

sending, by the user equipment, a first message to the third network device, where the first message is used to trigger the first IMS voice service; or,

The user equipment receives the first message from the third network device.
The method of claim 40 or 41, further comprising:

disabling, by the user equipment, the first capability;

The user equipment disables the N1 mode.
A method of communication comprising:

The user equipment sends a first message to the first network device, where the first message is used to trigger the Internet Protocol Multimedia Subsystem IMS voice service, the first capability of the user equipment is disabled, and the first capability is in S1 mode Capability or Evolved Universal Terrestrial Radio Access E-UTRA capability;

The user equipment enables the first capability.
The method of claim 43, further comprising:

When the user equipment successfully completes the IMS voice service, the user equipment disables the first capability.
A method of communication comprising:

If the first capability of the user equipment is disabled and the user equipment is a voice center, the user equipment enables the first capability, and sends a second registration request message to the first network device, the first The second registration request message includes first indication information, where the first indication information is used to indicate that the first capability is enabled, the first network device is located in the first 5G network, and the first capability is an S1 mode capability or Evolved Universal Terrestrial Radio Access E-UTRA capability; or,

If the first capability of the user equipment is disabled and the user equipment is a voice center, the user equipment sends a third registration request message to the second network device, and the second network device is located in the second 5G network , the second 5G network supports the new wireless NR bearer Internet Protocol Multimedia Subsystem IMS voice VoNR or does not support only the evolved packet system fallback EPS fallback bears IMS voice VoEF-only; or,

If the first capability of the user equipment is disabled and the user equipment is a voice center, the user equipment sends a fourth registration request message to the second network device, and the second network device is located on the 2G network or the 3G network middle.
The method of claim 45, further comprising:

disabling, by the user equipment, the first capability;

The user equipment disables the N1 mode.
A communication apparatus for performing the communication method according to any one of claims 1 to 46.
A communication system, comprising: access network equipment, access and mobility management function AMF, and Internet Protocol Multimedia Subsystem IMS;

The AMF is used to execute the communication method according to any one of claims 12 to 18 and 24;

The access network device, configured to execute the communication method according to claim 36 or 39;

The IMS is used to execute the communication method according to any one of claims 32 to 35.