CN115552971A

CN115552971A - Communication method, device and system

Info

Publication number: CN115552971A
Application number: CN202080100773.0A
Authority: CN
Inventors: 雷显调; 舒林; 潘晓刚; 李洪; 孙兵
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-09-30
Filing date: 2020-09-30
Publication date: 2022-12-30
Also published as: WO2022067734A1

Abstract

The application provides a communication method, a communication device and a communication system. The method comprises the following steps: the user equipment sends a first registration request message to first network equipment, wherein the first network equipment is positioned in a first 5G network; the user equipment receives a first registration response message from the first network equipment, wherein the first registration response message comprises first capability information; wherein the first capability information is used for indicating the support capability of the VoNR and/or the support capability of the VoEF-only. In the application, the network informs the UE of the VoNR supporting capability and/or the VoEF-only supporting capability of the network, so that the UE can perform a subsequent communication process in combination with its own capability to implement a voice service.

Description

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, apparatus, and system.

Background

In a 5G (fifth generation mobile communication technology) network, a new voice over new radio (VoNR) is used to implement a voice service of a User Equipment (UE). The VoNR scheme refers to a 5G access network and a core network providing voice services of an internet protocol IP Multimedia Subsystem (IMS).

At present, due to the problems of the capability of the base station, the deployment of the wireless network, and the like, the UE cannot perform the voice service in the VoNR manner on the 5G network, and at this time, how to implement the voice service of the UE becomes a problem to be solved urgently.

Disclosure of Invention

The application provides a communication method, a communication device and a communication system, which are used for realizing voice service of UE.

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

Here, the support capability of the NR refers to that the 5G network supports or does not support the VoNR, and the support capability of the VoEF-only refers to that the 5G network supports or does not support the VoEF-only, where the support capability of the VoEF-only may also be non-VoEF-only.

Optionally, voEF-only. VoEF-only may be understood as EPS fallback only carrying IMS voice (i.e. VoEF only), that is to say, voice traffic is implemented only by means of EPS fallback.

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

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

In other possible embodiments, the first capability information is located in the fourth bit and/or the fifth bit of the fifth octet of the 5G system network characteristics support information element.

In other possible embodiments, 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 the second value, the first capability information is used for indicating that VoNR is not supported.

In other possible embodiments, when the first capability information is the 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 the VoEF-only is not supported.

In other possible embodiments, the first capability information includes a first field and a second field, the first field is used for indicating the support capability of the VoNR of the current network, and the second field is used for indicating the support capability of the EPS fallback to carry the IMS voice VoEF.

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

In other possible embodiments, if 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 method further includes: the user equipment enables the first capability and sends a second registration request message to the first network equipment, wherein the second registration request message comprises first indication information, the first indication information is used for indicating that the first capability is enabled, and the first capability is S1 mode and/or E-UTRA capability.

In other possible embodiments, if 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 method further includes: the user equipment sends a third registration request message to the second network equipment; the user equipment receives a second registration response message from the second network equipment, where the second registration response message includes second capability information, the second capability information indicates that VoNR is supported or that VoEF-only is not supported, the second network equipment is located in the second 5G network, and the second network equipment may be an AMF in the second 5G network.

In other possible embodiments, if 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 method further includes: the user equipment sends the fourth registration request message to the second network equipment, where the second network equipment is located in the 2G or 3G network, and the second network equipment may be an MSC in the 2G or 3G network.

In other possible embodiments, the method further comprises: the user equipment disables the first capability; the user equipment disables the N1 mode.

Here, in some scenarios of the 4G network, the ue disables its first capability, and the ue may also disable the N1mode, so that the N1mode of the ue is also disabled during the period when the first capability of the ue is disabled, thereby avoiding the ping-pong handover.

In the application, the user equipment notifies the network that the first capability of the network is disabled in the registration process, the network carries the first capability information of the first 5G network in the registration response message sent to the user equipment, and the user equipment can execute the registration process and register to the first 5G network, the second 5G network, the 2G network or the 3G network under the scenario that the first capability information indicates that the first 5G network does not support VoNR or supports VoEF, thereby implementing the voice service of the user equipment.

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

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

In other possible embodiments, the first capability information includes a first field and a second field, the first field is used for indicating the support capability of the current network VoNR, and the second field is used for indicating the support capability of the EPS fallback carrying the IMS voice VoEF.

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

In some possible embodiments, the method further comprises: the user equipment enables the first capability and sends a second registration request message to the first network equipment, wherein the second registration request message comprises first indication information, and the first indication information is used for indicating that the first capability of the user equipment is enabled.

In other possible embodiments, the method further comprises: the user equipment sends third registration request information to second network equipment, and the second network equipment is positioned in a second 5G network; and the user equipment receives a second registration response message from the second network equipment, wherein the second registration response message comprises second capability information, and the second capability information indicates that VoNR is supported or VoEF-only is not supported.

In other possible embodiments, the method further comprises: the user equipment sends a fourth registration request message to a second network equipment, and the second network equipment is located in the 2G or 3G network.

In the application, the UE notifies the network that the first capability of the network is disabled in the registration process, and the network rejects the registration request of the UE in a scenario that the first capability of the UE is disabled and the first 5G network does not support VoNR or supports VoEF, and notifies 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 registration process and register to the first 5G network, the second 5G network, the 2G network, or the 3G network, thereby implementing the voice service.

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

In a fifth aspect, the present application provides a communication method, which may be applied in a first 5G network. The method can comprise the following steps: the user equipment receives a first cancellation message sent by third network equipment; the first cancellation message is used for indicating to cancel a first IMS voice service of the user equipment, the first cancellation message comprises service cancellation reason information, the service cancellation reason information is that a first capability of the user equipment is disabled, and the first capability is an S1 mode or an E-UTRA capability.

In some possible embodiments, the method further comprises: user equipment sends a first message to third network equipment, wherein the first message is used for triggering a first IMS voice service; alternatively, the user equipment receives a first message from a third network device.

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

In other possible embodiments, the method further comprises: when the user equipment successfully completes the IMS voice service, the user equipment enables the first capability.

In other possible embodiments, the method further comprises: user equipment initiates a registration process in a first cell, wherein the first cell is an NR cell supporting a new wireless NR to carry IMS voice VoNR or an NR cell not supporting an EPS fallback-only to carry IMS voice VoEF-only; or, the user equipment initiates a registration process in a second cell, where the second cell is a GSM cell or a UTRA cell.

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

In other possible embodiments, the method further comprises: when the user equipment enables the N1mode, the user equipment starts a timer; when the timer times out, the user equipment enables the N1 mode.

In the embodiment of the present application, the UE informs the network that the first capability of the network is disabled in the registration process, and then, in a 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 first cancellation message to the UE because the first capability of the UE is disabled, and informs the UE of a failure reason of the first IMS voice service, so that the UE can execute the registration process and register to the first 5G network, the second 5G network, the 2G network, or the 3G network, thereby implementing the voice service.

In a sixth aspect, the present application provides a communication method, which may be applied in a first 5G network. The method can comprise the following steps: the third network equipment sends a first cancellation message to the user equipment; the first cancellation message is used for indicating to cancel a first IMS voice service of the user equipment, the first cancellation message includes failure reason information of the first IMS voice service, the failure reason information is used for indicating that a first capability of the user equipment is disabled, and the first capability is an S1 mode or an E-UTRA capability.

In some possible embodiments, the method further comprises: the third network equipment receives a first message from the user equipment, wherein the first message is used for triggering the first IMS voice service; alternatively, the third network device sends the first message to the user equipment.

In other possible embodiments, the method further comprises: and the third network equipment sends a second message to the first network equipment, wherein the second message is used for triggering the establishment of QoS flow for the first IMS voice service.

In other possible embodiments, the method further comprises: and the third network equipment receives third information from the first network equipment, wherein the third information is used for triggering the sending of a first cancellation message to the user equipment, and the third message comprises failure reason information.

In a seventh aspect, the present application provides a communication method, which may be applied in a first 5G network. The method can comprise the following steps: the fourth network equipment receives a fourth message from the first network equipment, wherein the fourth message is used for requesting to establish QoS flow for the first IMS voice service of the user equipment; and the fourth network equipment sends a fifth message to the first network equipment, wherein the fifth message comprises failure reason information of the first IMS voice service, the failure reason information is used for indicating that the first capability of the user equipment is disabled, and the first capability is an S1 mode or an E-UTRA capability.

In an eighth aspect, the present application provides a communication method, which may be applied in a first 5G network. The method can comprise the following steps: the user equipment receives a sixth message from the fourth network equipment, wherein the sixth message comprises third capability information, the third capability information is used for indicating that a current cell of the user equipment does not support VoNR or supports VoEF-only, and the first capability of the user equipment is disabled, and is S1 mode or 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, wherein the second cell 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 other possible embodiments, the user equipment comprises an Access (AS) layer and a non-access (NAS) layer; the user equipment enables a first capability, comprising: the NAS layer enables the first capability; the above method may further comprise: the NAS layer instructs the AS layer to continue camping on the current cell.

In this embodiment, after the ue resides in the first 5G network, the fourth network device informs, through the system message, that the first 5G network does not support VoNR or supports VoEF, and the first capability of the ue is disabled, so that in such a scenario, the ue 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, thereby implementing the voice service.

In a ninth aspect, the present application provides a communication method, which can be applied to a first 5G network. The method can comprise the following steps: and the fourth network equipment sends a sixth message to the user equipment, wherein the sixth message comprises third capability information, the third capability information is used for indicating 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 S1 mode or E-UTRA capability.

In a tenth aspect, the present application provides a communication method, which may be applied in a first 5G network. The method can comprise the following steps: the user equipment receives a second cancellation message from third network equipment, wherein the second cancellation message is used for indicating that a first IMS voice service of the user equipment is cancelled, a first capability of the user equipment is disabled, and the first capability is an S1 mode or an E-UTRA capability; when the number of times that the user equipment receives the cancellation message is equal to or greater than a preset threshold value and the QoS flow of the first IMS voice service is not established, enabling the first capability by the user equipment, and sending a second registration request message to the first network equipment, wherein the second registration request message comprises first indication information, and the first indication information is used for indicating that the first capability is enabled; or, when the number of times that the user equipment receives the cancellation message 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 message to the second network equipment, where the second network equipment is located in a second 5G network, and the second 5G network supports VoNR or does not support VoEF-only; or, when the number of times that the user equipment receives the cancellation message 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 fourth registration request message to the second network equipment, and the second network equipment is located in the 2G network or the 3G network.

In this embodiment of the present application, a user equipment notifies, in a registration process, that a first capability of the network itself is disabled, then, in a scenario where a first 5G network does not support VoNR or supports VoEF, after the user equipment triggers a first IMS voice service, 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 times of receiving the cancellation message is equal to or greater than a preset threshold, and if the number of times of receiving the cancellation message is equal to or greater than the preset threshold, the user equipment regards a failure cause of the IMS voice service as that the first capability of the user equipment is disabled, and then, the user equipment may perform the above-mentioned registration process, and register to the first 5G network, the second 5G network, the 2G network, or the 3G network, thereby implementing the voice service.

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

In other possible embodiments, the method further comprises: the user equipment disables the first capability when the user equipment successfully completes the IMS voice service.

In the embodiment of the application, the user equipment does not need the network to inform that the first capability of the user equipment is disabled, but the first capability is enabled automatically when or before the IMS calling service is initiated, so that the user equipment can realize the voice service in a network which does not support VoNR or supports VoEF-only.

In a twelfth aspect, the present application provides a communication method, which may be applied in a first 5G network. The method can comprise the following steps: if the first capability of the user equipment is disabled and the user equipment is a voice center, enabling the first capability by the user equipment and sending a second registration request message to the first network equipment, wherein the second registration request message comprises first indication information, the first indication information is used for indicating that the first capability is enabled, the first network equipment is located in a first 5G network, and the first capability is S1 mode capability or E-UTRA capability; or, if the first capability of the ue is disabled and the ue is a voice center, the ue sends a third registration request message to the second network device, where the second network device is located in the second 5G network, and the second 5G network VoNR 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 equipment, and the second network equipment is located in the 2G network or the 3G network.

In some possible embodiments, the method further comprises: the user equipment disables the first capability; the user equipment disables the N1 mode.

In the embodiment of the application, in a scenario that the first capability of the user equipment is disabled and the user equipment is a voice center, the user equipment can enable the first capability of the user equipment after residing in the first 5G network, and then register the user equipment in the first 5G network, so that a voice service is realized; or the user equipment selects to fall back to the 2G network or the 3G network, and then voice service is realized.

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

In other possible embodiments, 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 the VoEF-only is not supported.

In other possible embodiments, if 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 apparatus further includes: a processing module to enable a first capability; the sending module is further 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 a first capability is enabled, where the first capability is an S1 mode and/or an E-UTRA capability.

In other possible embodiments, if 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 sending module is further configured to send a third registration request message to the second network device; the receiving module is further configured to receive a second registration response message from the second network device, where 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 the second 5G network, and the second network device may be an AMF in the second 5G network.

In other possible embodiments, if 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 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 a 2G or 3G network, and the second network device may be an MSC in the 2G or 3G network.

In other possible embodiments, the apparatus further comprises: a processing module to disable the first capability; the N1mode is disabled.

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

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

In a fifteenth aspect, the present application provides a communication apparatus, which may be a chip or a system on a chip in a user equipment, and may also be a functional module in the user equipment for implementing the method according to the third aspect or any possible implementation manner of the third aspect. For example, the communication device includes: a sending module, configured to send a first registration request message to a first network device, where the first registration request message includes second indication information, and the second indication information is used to indicate that a first capability of a user equipment is disabled, where the first capability is an S1 mode and/or an E-UTRA capability; a receiving module, configured to receive a first registration rejection message sent by a first network device, 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 VoNR or supports VoEF-only.

In some possible embodiments, the apparatus further comprises: a processing module to enable a first capability; the sending module is further 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 of the user equipment is enabled.

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

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

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

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

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

In other possible embodiments, the apparatus further comprises: and the processing module is used for enabling the first capability when the user equipment successfully completes the IMS voice service.

In other possible embodiments, the sending module is further configured to initiate a registration procedure in a first cell, where the first cell is an NR cell that supports NR cells or does not support VoEF-only; or, initiating a registration process in a second cell, where the second cell is a GSM cell or a UTRA cell.

In other possible embodiments, the processing module is further configured to start a timer when the user equipment disables the N1 mode; when the timer times out, the N1mode is enabled.

In an eighteenth aspect, the present application provides a communication apparatus, which may be a chip or a system on a chip in a third network device, and may also be a functional module in the third network device for implementing the method according to the sixth aspect or any possible implementation manner of the sixth aspect. For example, the communication device includes: a sending module, configured to send a first cancellation message to a user equipment; the first cancellation message is used for indicating to cancel a first IMS voice service of the user equipment, the first cancellation message includes failure reason information of the first IMS voice service, the failure reason information is used for indicating that a first capability of the user equipment is disabled, and the first capability is an S1 mode or an E-UTRA capability.

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

In other possible embodiments, 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 QoS flow establishment for the first IMS voice service.

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

In a nineteenth aspect, the present application provides a communication apparatus, which may be a chip or a system on a chip in a fourth network device, and may also be a functional module in the fourth network device, configured to implement the method according to any one of the seventh aspect or any possible implementation manner of the seventh aspect. For example, the communication device includes: a receiving module, configured to receive a fourth message from the first network device, where the fourth message is used to request to establish a QoS flow for a first IMS voice service of the user equipment; a sending module, 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 a first capability of the user equipment is disabled, where the first capability is an S1 mode or an E-UTRA capability.

In a twentieth aspect, the present application provides a communication apparatus, which may be a chip or a system on a chip in a user equipment, and may also be a functional module in the user equipment for implementing the method according to the eighth aspect or any possible implementation manner of the eighth aspect. For example, the communication device 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 a current cell of the ue does not support VoNR or supports VoEF-only, where a first capability of the ue is disabled, and the first capability is an S1 mode or an E-UTRA capability; a sending module, configured to execute one of the following steps according to the sixth message: enabling the first capability, and initiating a registration process in the current cell; initiating a registration process in a first cell, wherein the first cell supports VoNR or does not support VoEF-only; and initiating a registration process in a second cell, wherein 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 a chip in a user equipment, and may also be a functional module in the user equipment for implementing the method according to any possible implementation manner of the ninth aspect or the ninth aspect. For example, the communication device includes: a sending module, configured to send a sixth message to the ue, where the sixth message includes third capability information, where the third capability information is used to indicate that a current cell of the ue does not support VoNR or supports VoEF-only, and a first capability of the ue is disabled, where the first capability is an S1 mode or an E-UTRA capability.

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

In some possible embodiments, 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 the first message from the third network device.

In other possible embodiments, the processing module is further configured to disable the first capability; the N1mode is disabled.

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

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

In some possible embodiments, the processing module is further configured to disable the first capability; the N1mode is disabled.

In a twenty-fifth aspect, the present application provides a user equipment, comprising: a processor and a memory; a processor is coupled with the memory, the processor being configured to read and execute instructions in the memory to implement the communication method as in any one of the first, third, fifth, eighth and 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 with the memory, and the processor is configured to read and execute instructions in the memory to implement the communication method according to any one of the second aspect and the fourth aspect.

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

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

In a twenty-ninth aspect, the present application provides a communication system comprising: access network equipment, an AMF and an IMS; an AMF for performing the communication method according to any one of the second and fourth aspects; an access network apparatus configured to perform the communication method according to any one of the seventh aspect or the ninth aspect; IMS for performing the communication method according to any one of the sixth aspects.

A thirty-first aspect provides a computer-readable storage medium storing instructions for performing the communication method of any one of the first to twelfth aspects described above when the instructions are executed on a computer.

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

It should be understood that the thirteenth aspect to the thirty-first aspect of the present application are consistent with the technical solutions of the first aspect to the twelfth aspect of the present application, and similar beneficial effects are achieved in various aspects and corresponding possible implementations, and are not described again.

Drawings

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

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

fig. 2 is a first flowchart of a communication method in the embodiment of the present application;

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

fig. 3B is a schematic diagram of a second registration procedure of the UE in the embodiment of the present application;

fig. 3C is a schematic diagram of a third registration procedure of the UE in the embodiment of the present application;

fig. 4 is a second flowchart of a communication method in the embodiment of the present application;

fig. 5 is a third flowchart of a communication method in the embodiment of the present application;

fig. 6 is a fourth flowchart illustrating a communication method according to an embodiment of the present application;

fig. 7 is a fifth flowchart illustrating a communication method according to an embodiment of the present application;

fig. 8 is a sixth flowchart of a communication method in the embodiment of the present application;

fig. 9 is a seventh flowchart illustrating a communication method according to an 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 hardware diagram of a communication device in the embodiment of the present application.

Detailed Description

The embodiments of the present application are described below with reference to the drawings. In the following description, reference is made to the accompanying drawings which form a part hereof and which show by way of illustration specific aspects of embodiments of the application or which may be used in the practice of the embodiments of the application. It should be understood that embodiments of the present application may be used in other ways and may involve structural or logical changes not depicted in the drawings. The following detailed description is, therefore, not to be taken in a limiting sense. For example, it should be understood that the disclosure in connection with the described methods may equally apply to the corresponding apparatus or system for performing the described methods, and vice versa. For example, if one or more particular method steps are described, the corresponding apparatus may comprise one or more units, such as functional units, to perform the described one or more method steps (e.g., a unit performs one or more steps, or multiple units, each of which performs one or more of the multiple steps), even if such one or more units are not explicitly described or illustrated in the figures. On the other hand, for example, if a particular apparatus is described based on one or more units, such as functional units, the corresponding method may comprise one step to perform the functionality of the one or more units (e.g., one step performs the functionality of the one or more units, or multiple 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 features of the various exemplary embodiments and/or aspects described herein may be combined with each other, unless explicitly stated otherwise.

Two voice access methods are defined in a 5G (fifth generation mobile communication technology) network: new radio bearer internet protocol multimedia subsystem (IMS) voice (VoNR) and evolved packet system fallback (EPS fallback) bearer IMS voice (VoEF). The VoNR mode is that a 5G access network and a core network provide an IMS voice service, and the VoEF mode is that the UE falls back to an EPS (fourth generation mobile communication technology (4G)) when initiating an IMS voice service on the 5G network, and implements the voice service through the 4G network.

An embodiment of the present application provides a communication system, in which a 4G network and a 5G network may coexist, and a UE may perform interworking through the 4G communication network and the 5G communication network. Fig. 1 is a schematic structural diagram of a communication system in the embodiment of the present application, and referring to fig. 1, the 4G network may be a Long Term Evolution (LTE) network. The 4G communication network includes a 4G access network and a 4G Core Network (CN), the 4G core network may be an EPC network, and the 4G access network may include an evolved-universal terrestrial radio access network (E-UTRAN). In a 4G network, the UE, E-UTRAN, and EPC may constitute an Evolved Packet System (EPS). In the 4G core network, a Mobility Management Entity (MME), a Serving Gateway (SGW), a packet data network gateway (PGW), a Policy and Charging Rules Function (PCRF), and a Home Subscriber Server (HSS) may be included.

The 5G communication network may include a 5G Access Network (AN) and a 5G core network (5 GC). The 5G access network may include a 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), and the like.

Referring to fig. 1, the HSS and the UDM may be deployed in a unified manner, denoted by HSS + UDM. Specifically, a function of the UDM may be added in the HSS, or a function of the HSS may be added in 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 communicatively connected to each other, which is not limited in the embodiment of the present application.

The PCRF and the PCF can be deployed in a unified way and are represented by PCRF + PCF. Specifically, a PCF function may be added to the PCRF, or a PCRF function may be added to the PCF, or another device may implement the functions of the PCRF and the PCF at the same time. Certainly, the PCRF and the PCF may also be deployed separately, and the PCRF and the PCF are connected in communication, which is not limited in this embodiment of the present invention.

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

UPF and PGW-U (PGW user plane function) can be deployed in a unified way and are expressed by UPF + PGW-C. Specifically, the function of the PGW-U may be added to the UPF, or the UPF function may be added to the PGW-U, or the UPF and PGW-U functions may be simultaneously implemented in another device. Of course, the UPF and the PGW-U may also be separately deployed and communicatively connected, and the embodiment of the present application is not limited.

The 4G network and the 5G network may further include other devices, for example, the 5G network may further include: a network slice specific identity authentication and authorization function (NSSAAF), a Network Slice Selection Function (NSSF), an authentication server function (AUSF), an Application Function (AF), a Data Network (DN), and the like, which are not specifically limited in the embodiments of the present disclosure.

In the above communication system, the UE may access the 5G core network through a third generation partnership project (3 rd generation partnership project,3 GPP) technology and/or a non-3GPP technology. Specifically, the UE may access the 5G core network through the 3GPP access network device, or may access the 5G core network through the non-3GPP access network device and the gateway device. In this embodiment, the non-3GPP access network device may be a Wireless Access Point (WAP) in a Wireless Local Area Network (WLAN), an access device in Worldwide Interoperability for Microwave Access (WiMAX), a switch or a router of a Code Division Multiple Access (CDMA) network, and the like. The gateway device may be a non-3GPP interworking function (N3IWF), etc.

In the above communication system, the UDM has a function of unified data management. The system is mainly responsible for functions of managing subscription data, user access authorization and the like.

The PCF has a policy control function, and is mainly responsible for relevant policy decisions such as a charging policy, qoS bandwidth guarantee, and policy for sessions and service flows. In the framework, PCFs connected to the AMF and SMF correspond to an AM PCF (PCF for Access and Mobility Control) and an SM PCF (PCF for Session Management), respectively, and may not be the same PCF entity in an actual deployment scenario.

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

The AMF has access and mobility management functions, and mainly performs functions of mobility management, access authentication/authorization and the like. In addition, the method is also responsible for transferring the user policy between the UE and the PCF.

The UPF is a user plane functional entity and is used as an interface with a data network to complete functions of user plane data forwarding, session/stream level-based charging statistics, bandwidth limitation and the like.

The functions of each interface are described as follows:

n7: the interface between the PCF and the SMF is used to issue control policies for Packet Data Unit (PDU) session granularity and traffic data stream granularity.

N3: a communication interface between the UPF + PGW-U and the NG-RAN.

N15: and the interface between the PCF and the AMF is used for issuing the UE strategy and the access control related strategy.

N4: the interface between the SMF and the UPF is used for transmitting information between the control plane and the user plane, and comprises the control of issuing of forwarding rules, qoS control rules, flow statistic rules and the like facing the user plane and the information reporting of the user plane.

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

N2: and the interface between the AMF and the RAN is used for transmitting radio bearer control information from the core network side to the RAN and the like.

N1: the interface between the AMF and the UE, access independent, is used to deliver QoS control rules to the UE, etc.

N8: and the interface between the AMF and the UDM is used for acquiring the subscription data and the authentication data related to access and mobility management from the UDM by the AMF, registering the current mobility management related information of the UE from the UDM by the AMF and the like.

N10: and the interface between the SMF and the UDM is used for acquiring the subscription data related to the session management from the SMF to the UDM, registering the related information of the current session of the UE from the SMF to the UDM, and the like.

N26: and an interface between the MME and the AMF, which is used for transmitting the mobility management state and the session management state between the source network and the target network in the interoperation process of the 4G network and the 5G network.

S6a: communication interface between MME and HSS + UDM.

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

S1-MME: a communication interface between the MME and the E-UTRAN.

S1-U: a communication interface between the E-UTRAN and the SGW.

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

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

It should be noted that the UE in the embodiment of the present application is a terminal device with a wireless communication function, and may be deployed on land, including indoors or outdoors, handheld, wearable, or vehicle-mounted; can also be deployed on the water surface (such as a ship and the like); and may also be deployed in the air (e.g., airplanes, balloons, satellites, etc.). The terminal device may be a mobile phone (mobile phone), a tablet computer (Pad), a computer with a wireless transceiving function, a Virtual Reality (VR) terminal device, an Augmented Reality (AR) terminal device, a wireless terminal in industrial control (industrial control), a wireless terminal in self-driving (self-driving), a wireless terminal in remote medical (remote medical), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation safety (transportation safety), a wireless terminal in smart city (smart city), a wireless terminal in smart home (smart home), and the like. The terminal device may also be a handheld device having wireless communication capabilities, a vehicle mounted device, a wearable device, a computing device or other processing device connected to a wireless modem, or the like. The terminal devices may be called different names in different networks, for example: a terminal device, an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent or user device, a cellular telephone, a cordless telephone, a Session Initiation Protocol (SIP) telephone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a terminal device in a 5G network or a future evolution network, etc.

In the communication system shown in fig. 1, functions and interfaces of the respective devices are merely exemplary, and not all functions of the respective devices are necessary when applied to the embodiments of the present application. All or part of the devices of the core network may be physical devices, or may be virtualized devices, which is not limited herein. Of course, the communication system in the embodiment of the present application may further include other devices not shown in fig. 1, which is not limited herein.

It should be noted that, in the embodiment of the present application, "and/or" is only one kind of association relation describing an association object, and indicates that three kinds of relations may exist. For example, a and/or B, may represent: a exists alone, A and B exist simultaneously, 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 deployment is not as good as that of a 4G network, an operator generally supports VoEF at the initial network deployment, and supports VoNR after the coverage of the 5G network is improved (for example, some operators explicitly indicate that it is relatively difficult to implement full coverage of a 5G network for IMS voice service, and to avoid frequent handover, voice continuity is maintained by using a 5G fallback VoLTE scheme (i.e., voEF) under an independent networking (SA) at the initial stage, and when the coverage performance of the 5G network is completely improved, voNR is considered in due time). Whereas the premise of VoEF is: the capability reported by the UE to the network must support evolved universal terrestrial radio access (E-UTRA) capability.

However, in some scenarios of the 4G network (e.g. the number of attach (attach) attempts specified by the 3GPP protocol TS 24.301 reaches 5 times, etc.), the UE may disable (disable) its own E-UTRA capability, i.e. the UE does not support the E-UTRA capability, which is also referred to as S1 mode (S1 mode) or S1 mode capability (S1 mode capability). Then, after the UE disable its S1 mode or E-UTRA capability, if the UE selects a network to the 5G network and initiates a registration (registration) procedure in the 5G network, it will inform the network that its S1 mode or E-UTRA capability is disabled (disabled). Then, in a scenario that the S1 mode of the UE is disabled and the network does not support VoNR or supports VoEF-only, the UE cannot fall back to the 4G network, and the IMS voice service of the UE will inevitably fail, which affects user experience.

In order to solve the above problem, embodiments of the present application provide a communication method, which may be applied to a 5G network in the above communication system, where the 5G network and a 4G network may interoperate.

First, concepts related to the embodiments of the present application will be explained.

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

It is understood that whether a network supports VoNR may refer to whether an access network device and/or a core network device in the network supports VoNR; similarly, whether a network supports VoEF may refer to whether an access network device and/or a core network device in the network supports VoEF. In the communication system, the access network device may be a base station of a 5G network (e.g., a gNB) or a base station of a 4G network (e.g., an eNB); the core network device may be a core network device of a 5G network (e.g., AMF) or a core network device of a 4G network (e.g., MME).

Second, voEF-only. The VoEF-only may be understood as that only EPS fallback carries IMS voice (i.e. only VoEF), that is, voice traffic is implemented only by means of EPS fallback.

In some possible embodiments, a 5G network may have a scenario of default support of VoEF, in which case, the 5G network does not support VoNR may be understood as support of VoEF-only, and the 5G network supports VoNR may be understood as not support of VoEF-only; alternatively, the 5G network may have a configurable VoNR and/or VoEF support scenario, where a 5G network supporting VoEF-only may be understood as not supporting VoNR but supporting VoEF, and a 5G network not supporting VoEF-only may be understood as supporting VoNR and VoEF.

Of course, during the subsequent evolution of the wireless communication technology, if the network can also support other voice access manners besides VoNR and VoEF, the VoEF-only may be understood as that the network does not support other 5G voice access manners besides VoEF.

The following describes a communication method provided in an embodiment of the present application with reference to the above communication system. Hereinafter, if not specifically stated, the first network device takes an AMF (which may be denoted as AMF a) in the first 5G network as an example. The second network device is exemplified by an AMF (which may be denoted as AMF C) in the second 5G network or a Mobile Switching Center (MSC) in the 2G network or the 3G network. The third network device is exemplified by IMS, the fourth network device is exemplified by an access network device of the first 5G network, and the access network device of the first 5G network may be a base station (e.g., a gNB) of the 5G network.

Fig. 2 is a first flowchart of a communication method in an embodiment of the present application, and referring to fig. 2, the communication method may include: s201 to S203.

S201, the UE sends a first registration request message to the AMF a (i.e. the first network device).

Illustratively, after the UE selects the first 5G network, a registration procedure is to be initiated in the first 5G network, at this time, the UE performs S201 to send a first registration request message, such as a registration request a message, to the AMF a.

Optionally, the UE may carry an indication information in the registration request a message, and inform the network of the enabling condition of the first capability (i.e., the S1 mode or the E-UTRA capability) of the UE according to different assignments of the first indication information. Or, the UE may also carry an indication information in the registration request a in the scenario that the first capability is disabled, so as to inform the network that the first capability of the UE is disabled; in the scenario that the first capability is enabled (enabled), no information is carried in registration request a to inform the network that the first capability of UE is enabled. Furthermore, the UE may also not carry any information in registration request a in the scenario that the first capability is disabled, so as to inform the network that the first capability of the UE is disabled; in the scenario that the first capability is enabled, an indication information is carried in registration request A to inform the network UE that the first capability is enabled. Of course, the UE may also notify the network of the enabling condition of the first capability by other ways, and the embodiment of the present application is not limited in particular.

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

Exemplarily, the AMF a, after receiving the registration request a message sent by the UE, sends a first registration response message, such as a registration accept a message, to the UE, and carries first capability information in the registration accept a message, where the first capability information is used to indicate the supported capability of the VoNR and/or the supported capability of the VoEF-only. Then, the UE can know the network capability of the first 5G network after receiving the registration accept a message.

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

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

In some possible embodiments, the first capability information may be, but is not limited to, the following specific implementations:

first, the VoNR supporting capability is indicated by an indication field. When the first capability information is a first value, the first capability information is used for indicating that VoNR is supported; when the first capability information is a second value, the first capability information is used for indicating that VoNR is not supported; the first value and the second value are different. For example, the first value takes 1, the second value takes 0; alternatively, the first value may take 0 and the second value may take 1.

Second, the support capability of VoEF-only is indicated by an indication field. When the first capability information is a third value, the first capability information is used for indicating that VoEF-only is supported; when the first capability information is a fourth value, the first capability information indicates that the VoEF-only is not supported; the third value is different from the fourth value, e.g., the third value takes 1 and the fourth value takes 0; alternatively, the third value takes 0 and the fourth value takes 1.

Third, the support capability of the VoEF-only is indicated by two indication fields. The first capability information includes a first field for indicating a support capability of the VoNR and a second field for indicating a support capability of the 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 is supported (or that VoNR is not 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 VoEF-only is not supported (or that 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 for indicating a support capability of the VoNR and a second field for indicating a support capability of the 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 that VoEF-only is supported; when the first field indicates that the VoNR is supported and the second field indicates that the VoEF is supported, the first capability information indicates that the VoNR is supported and the VoEF-only is not supported.

Of course, other implementation manners may also exist in the first capability information, and the embodiment of the present application is not particularly limited.

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

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

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

TABLE 1

Similarly, assuming that the first capability information is used to indicate the support capability of the VoEF-only, the first capability information may include IMS-VoEF-only-3GPP (IMS voice over EPS fallback on 3GPP access indicator) for indicating the support capability of the VoEF-only accessed through the 3GPP (i.e., the support of the VoEF over EPS fallback on 3GPP access) and/or IMS-VoEF-only-N3GPP (IMS voice over EPS fallback on 3GPP access) for indicating the support capability of the VoEF-only accessed through the N3GPP (i.e., IMS-VoEF-only-N3GPP access).

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

From the above, regardless of whether the first capability of the UE is disabled, the AMF a may carry the first capability information in the registration accept a message to inform the UE of the support capability of the network, so that the UE may perform the subsequent communication process in combination with its own capability.

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 one of the following registration procedures:

first, fig. 3A is a schematic diagram of a first registration process of a UE in this embodiment, referring to fig. 3A, after S202, the method may further include S204 to S206.

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

Wherein the registration request B message may include first indication information indicating that the first capability is enabled.

In some possible embodiments, the UE may include a non-access stratum (NAS) and an Access Stratum (AS). Then, S204 may include: enabling the first capability by the NAS layer and indicating the AS layer to continuously reside in the current cell; and the AS layer sends a registration request B message to the AMF A in the current cell.

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

S206, the UE sends a third registration complete message (which may be denoted as registration complete B message) to AMF A.

Exemplarily, 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, then, in this scenario, if the UE initiates an IMS voice service, the IMS voice service will inevitably fail. Therefore, in order to implement voice service in this scenario, the UE may enable (enable) or re-enable (re-enable) its own first capability and inform the network through a registration request B message. Then, AMF A responds to the UE, sends registration accept B message to the UE, and carries the first capability information in the registration accept B, so that the UE determines that the first 5G network does not support VoNR or VoEF-only according to the first capability information and the enabling situation of the first capability of the UE, and sends registration complete B message to AMF A to register to the first 5G network when the first capability of the UE is enabled.

In some possible embodiments, after the UE successfully registers in the first 5G network through the registration procedure, the UE may perform an 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 4G network described above.

Secondly, fig. 3B is a schematic diagram of a second registration process of the UE in the embodiment of the present application, and referring to fig. 3B, after S202, the method may further include S207 to S209.

S207, the UE sends a third registration request message (which may be referred to as registration request C message) to the AMF C (i.e., the second network device).

In some possible embodiments, the registration request C message may include second indication information indicating that the first capability of the UE is disabled.

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

It is understood that the second 5G network and the first 5G network may belong to different Public Land Mobile Networks (PLMNs) or cells under a PLMN, or may belong to different cells under the same PLMN.

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

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

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

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

In some possible embodiments, 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 a 5G network that supports VoNR or does not support VoEF-only is found, and resides on the 5G network, and then registers to the 5G network.

In the embodiment of the present application, the UE knows, through S201 to S203, that the first 5G network does not support VoNR or supports VoEF-only, and that the UE knows that its first capability is disabled, and in this scenario, if the UE initiates an IMS voice service, the IMS voice service is inevitably failed, so, in order to implement the voice service in this scenario, the UE may select a new 5G network (i.e., a second 5G network), then the AMF C sends a registration accept C message to the UE, where the registration accept C message carries second capability information, and the UE determines, according to the second capability information and the enablement of its first capability, that the second 5G network supports VoNR or does not support VoEF-only, and the first capability of the UE itself is enabled, sends a registration complete C message to the AMF C to register to the second 5G network, so as to implement the voice service of the UE.

In some possible embodiments, during the process of performing S207 to S209, the UE may further maintain a PLMN list, where network identifiers of 5G networks that do not support VoNR or support VoEF-only are stored in the PLMN list. In this way, the UE may search only other 5G networks that are not in the PLMN list during network searching, and then initiate a registration procedure until the registration accept message sent by the network indicates that the current 5G network supports VoNR or does not support VoEF-only.

Thirdly, fig. 3C is a schematic diagram of a third registration process of the UE in the embodiment of the present application, referring to fig. 3C, after S202, the method may further include S210 to S212.

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

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

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

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

In some possible embodiments, in S204 to S212, the 5G network may be understood as a 5G PLMN, and may also be understood as an NR cell (5G cell) under the PLMN; a 2G network or a 3G network may be understood as a global system for mobile communications (GSM) PLMN or a Universal Terrestrial Radio Access (UTRA) PLMN, and may also be understood as a GSM cell or a UTRA cell below the PLMN.

In some possible embodiments, in some scenarios of the 4G network, the UE may disable the first capability of the UE itself, and the UE may also disable the N1mode (N1 mode) or the N1mode capability (N1 mode capability), so that the N1mode of the UE is also disabled during the period when the first capability of the UE is disabled, thereby avoiding the ping-pong handover.

Further, when the UE disables the N1mode or the N1mode capability, the UE starts a timer; when the timer times out, the UE enables or re-enables the N1mode or N1mode capabilities to restore the 5G capabilities of the UE.

In the embodiment of the application, the UE notifies the network that the first capability of the network is disabled in the registration process, the network carries the first capability information of the first 5G network in the registration response message sent to the UE, and the UE can execute the registration process to register to the first 5G network, the second 5G network, the 2G network, or the 3G network under the scenario that the first capability information indicates that the first 5G network does not support VoNR or supports VoEF, thereby implementing the voice service of the UE.

Fig. 4 is a second flowchart schematic diagram of the communication method in the embodiment of the present application, and referring to fig. 4, the communication method may include S401 to S403.

S401, UE sends registration request A message to AMF A.

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

S402, AMF a sends a first registration reject message (which may be referred to as registration reject message) to the UE.

Wherein the registration request message may include reject reason information indicating that the first 5G network does not support VoNR or supports VoEF-only.

Illustratively, the UE informs the network that its first capability is disabled through the registration request a message during the registration process, and the first 5G network does not support VoNR or supports VoEF-only at this time, then the AMF a rejects the registration request of the UE, sends the registration request message to the UE, and informs 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 by carrying rejection reason information. Thus, the UE can perform subsequent communication procedures after receiving the registration request.

Further, after receiving the registration request message through S402, the UE may perform any registration procedure from S204 to S212 according to the above embodiment, which is not described herein again.

In the embodiment of the application, the UE notifies the network that the first capability of the network is disabled in the registration process, and the network rejects the registration request of the UE in a scenario that the first capability of the UE is disabled and the first 5G network does not support VoNR or supports VoEF, and notifies 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 registration process and register to the first 5G network, the second 5G network, the 2G network, or the 3G network, thereby implementing the voice service.

An embodiment of the present application further provides a communication method, fig. 5 is a third flowchart illustration of the communication method in the embodiment of the present application, and as shown in fig. 5, the method may include S501:

s501, the UE receives a first cancellation message (which may be denoted as cancel a message) sent by the IMS (i.e., a third network device).

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

Illustratively, if the first capability of the UE is disabled, the UE may inform the network that the first capability of the UE is disabled during registration with the first 5G network. Then, when the UE needs to perform an IMS voice service, the UE triggers a first IMS voice service (which may be an IMS calling service or an IMS called service), and at this time, the UE is registered in the IMS. After the IMS knows that the UE triggers the first IMS voice service, the IMS may disable the cancellation of the present IMS voice service, i.e., the first IMS voice service, because of the first capability of the UE. At this time, the IMS sends cancel a (first cancel message) to the UE, where the cancel a includes the service cancellation reason information.

In some possible embodiments, taking the calling scenario as an example, as shown by a solid line in fig. 5, before S501, the method may further include S502a to S506a.

S502a, the UE sends a first message (e.g., invite message) to the IMS.

The first message is used for triggering a first IMS voice service of the UE. And when the UE needs to initiate the calling service, the UE sends an invite message to the AMF A.

It should be noted that the sending mentioned herein may refer to transparent transmission or forwarding by a plurality of network elements in the 5G core network, for example, sending through SMF, PCF, P-CSCF, etc., which is not limited in this respect.

S503a, IMS sends a second message (e.g., 200OK/ACK message) to AMF a.

S504a: the AMF a sends a fourth message (e.g., PDU session resource modification request message) to the gNB (i.e., fourth network device).

For example, AMF a may send a PDU session resource modification request message to the gNB to request the gNB to establish a quality of service flow (QoS flow) for the first IMS voice traffic.

S505a, the gNB sends a PDU fifth message (e.g. PDU session resource modification response/reject message) to the AMF a.

Wherein the PDU session resource model response/reject message includes failure cause information of the first IMS voice service, the failure cause information indicating that the first capability of the UE is disabled. That is, the QoS flow setup for the first IMS voice service fails due to the first capability of the UE being disabled.

Illustratively, the gNB knows that the first capability of the UE is disabled through the registration procedure, and the first 5G network does not support VoNR or supports VoEF-only, then the gNB may send a PDU session resource modification response/reject message to AMF a and inform the AMF a through the failure cause information that the QoS flow establishment fails because the first capability of the UE is disabled.

S506a, AMF a sends failure cause information to IMS.

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

In some possible embodiments, taking the called scenario as an example, as shown by a dashed line in fig. 5, before S501, the method may further include S502b to S507b.

S502b: the IMS sends an invite message to AMF a.

The sending here may refer to sending through a plurality of network elements in the 5G core network, for example, sending through an SMF, a PCF, a P-CSCF, and the like, which is not limited in detail.

Exemplarily, when a calling User Equipment (UE) needs to initiate a calling, the calling UE can initiate a call on a 5G network where the calling UE is located, and an IMS (IP multimedia subsystem) sends an invite to a 5GC of a called UE; if the UPF can not be connected to the UE, sending a Downlink Data Notification (DDN) message to the SMF; and the SMF informs the AMF of the downlink voice service of the called UE according to the DDN message.

S503b, AMF a sends a paging message to the UE.

Illustratively, AMF a 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 the AMF A.

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

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

S506b, the gNB sends a PDU session resource modification response/reject message to the AMF A.

Wherein the PDU session resource modification response/reject message may include failure cause information of the first IMS voice service, the failure cause information indicating that the first capability of the UE is disabled. That is, the QoS flow setup for the first IMS voice service fails due to the first capability of the UE being disabled.

Illustratively, the gNB knows that the first capability of the UE is disabled through the registration procedure, and the first 5G network does not support VoNR or supports VoEF-only, then the gNB may send a PDU session resource modification response/reject message to AMF a, and informs that the QoS flow establishment fails because the first capability of the UE is disabled.

S507b, the AMF a sends failure cause information to the IMS.

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

Further, after receiving the cancel a message through the S501, the UE may perform any registration procedure from S204 to S212 with reference to the above embodiment, which is not described herein again.

In the embodiment of the present application, the UE notifies the network that the first capability of the network is disabled in the registration process, and then, in a 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 notifies the UE of a failure reason of the first IMS voice service, so that the UE can perform the registration process and register to the first 5G network, the second 5G network, the 2G network, or the 3G network, thereby implementing the voice service.

Fig. 6 is a schematic diagram of a fourth flowchart of the communication method in the embodiment of the present application, and referring to fig. 6, the method may include S601 to S602c.

S601, the gNB sends a sixth message (e.g., a system message) to the UE.

Wherein, the system information (system information message) may include third capability information, the third capability information indicating that VoNR is not supported or VoEF-only is supported.

Illustratively, after the UE camps on one NR cell (i.e., the current NR cell), the gNB sends a system message, such as a Master Information Block (MIB), a System Information Block (SIB), etc., to the UE. When sending the system message, the gNB may carry capability information (i.e., third capability information) of the current NR cell in the system message.

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

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

The implementation process of S602a may refer to the descriptions of S204 to S206 in the foregoing embodiments, and is not described herein again.

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

The implementation process of S602b may refer to descriptions of S207 to S209 in the above embodiments, and is not described herein again.

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

The implementation process of S602c may refer to the descriptions of S210 to S212 in the foregoing embodiment, and is not described herein again.

It should be noted that 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 this embodiment of the present application, after the UE resides in the first 5G network, the gNB notifies, through the system message, that the first 5G network does not support VoNR or supports VoEF, and the first capability of the UE is disabled, so that in such a scenario, the UE can perform the above registration process, register to the first 5G network, the second 5G network, the 2G network, or the 3G network, and further implement the voice service.

Fig. 7 is a fifth flowchart schematic diagram of the communication method in the embodiment of the present application, and referring to fig. 7, the method may include S701 to S702c.

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

The cancel B message is used for indicating 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, the UE may inform the network that the first capability of the UE is disabled during registration with the first 5G network. Then, when the UE needs to perform an IMS voice service, the UE triggers the first IMS voice service, and at this time, the UE is registered in the IMS. After the IMS knows that the UE triggers the first IMS voice service, the IMS may disable to cancel the present IMS voice service, i.e., the first IMS voice service, because of the first capability of the UE. At this time, the IMS sends a cancel B message to the UE, where the cancel B message includes the service cancellation reason information.

Further, the UE may perform one of the following S702a, S702B, and S702c according to the cancel B message.

S702a, when the number of times that the UE receives cancel messages is equal to or larger than a preset threshold value and the QoS flow of the first IMS voice service is not established, the UE enables the first capability and sends a registration request B to the AMF A.

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

S702c, when the number of times that the UE receives the cancel message is equal to or greater than a 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 accumulatively receives the cancel message. 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 the count is increased by one each time the cancel message is received. The counter can not set the upper limit of the count, and the UE automatically judges whether the current count is equal to or greater than the preset threshold value after reading the count; or, the counter may set an upper count limit, and the counter is cleared whenever the count reaches a preset threshold, so that the UE can determine whether the number of times the UE receives the cancel message is equal to or greater than the preset threshold only by reading whether the current count is cleared. Of course, the counting may also be implemented in other forms, and the embodiment of the present application is not particularly limited.

In practical application, the preset threshold may be 5, 8, 10, or the like, and may also be configured according to practical application, and the embodiment of the present application is not specifically limited.

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

Further, when the UE disables the N1mode or the N1mode capability, the UE may start a timer; when the timer times out, the UE enables or re-enables the N1mode or N1mode capabilities to restore the 5G capabilities of the UE.

In the embodiment of the application, the UE informs the network that the first capability of the UE is disabled in the registration process, then, in a 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 first capability of the UE is disabled, after the UE receives cancel B, the UE determines whether the number of times of received cancel is equal to or greater than a preset threshold, and if the number of times of received cancel is equal to or greater than the preset threshold, the UE considers that the failure cause of the IMS voice service is disabled because the first capability of the UE is disabled, and then, the UE may perform the registration process to register to the first 5G network, the second 5G network, the 2G network, or the 3G network, thereby implementing the voice service.

Fig. 8 is a sixth flowchart illustration of the communication method in the embodiment of the present application, and referring to fig. 8, the method may include S801 to S802.

S801, the UE sends a first message (e.g., invite message) to the AMF a.

S802, enabling the first capability by the UE.

It should be noted that the method shown in fig. 8 may be applied to a scenario where the first capability of the UE is disabled, and when the UE wants to perform the IMS calling service after the UE successfully registers in the first 5G network, steps S801 to S802 may be performed, that is, the UE sends invite to the AMF a and enables the first capability of the UE.

In practical applications, the execution sequence of S801 and S802 is not particularly limited. For example, S801 and S802 may be performed simultaneously; or, the step S801 is executed first, and the step S802 is executed later; then, S802 is executed first, and S801 is executed later. The execution sequence of S801 and S802 is not specifically limited in this embodiment.

In some possible embodiments, 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 some scenarios of the 4G network.

In the embodiment of the application, the UE does not need the network to inform that the first capability of the UE is disabled, but performs the first capability automatically when or before the IMS calling service is initiated, so that the UE can implement the voice service in the network that does not support VoNR or supports VoEF-only.

Fig. 9 is a seventh flowchart schematic diagram of the communication method in the embodiment of the present application, and referring to fig. 9, the method may include S901a, S901b, and S901c.

In some possible embodiments, 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, UE enables the first capability and sends a registration request B message to AMF A.

The implementation process of S901a may refer to the descriptions of S204 to S206 in the above embodiments, and is not described herein again.

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

The implementation process of S901b may refer to the descriptions of S207 to S209 in the above embodiments, and is not described herein again

S901c, UE sends attach request message to MSC.

The implementation process of S901c may refer to the descriptions of S210 to S212 in the above embodiments, and is not described herein again.

In the embodiment of the application, in a scenario that the UE is disabled and the UE is a voice center, after residing in the first 5G network, the UE can enable the first capability of the UE and then register in the first 5G network, thereby implementing a voice service; or the UE selects to fall back to the 2G network or the 3G network, and then voice service is realized.

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

In other possible embodiments, 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 the second value, the first capability information is used for indicating that the VoNR is not supported.

In other possible embodiments, 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.

In other possible embodiments, if the first capability of the ue is disabled and the first capability information indicates that VoNR is not supported or VoEF-only is supported, as shown by the dashed line in fig. 10, the apparatus further includes: a processing module 13 for enabling a first capability; the sending module is further 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 a first capability is enabled, where the first capability is an S1 mode and/or an E-UTRA capability.

In other possible embodiments, if 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 sending module is further used for sending a third registration request message to the second network equipment; the receiving module is further configured to receive a second registration response message from the second network device, where the second registration response message includes second capability information, the second capability information indicates that VoNR is supported or that VoEF-only is not supported, the second 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 embodiments, a processing module to disable a first capability; the N1mode is disabled.

The embodiment of the present application provides a communication apparatus, which may be a chip or a system on a chip in a first network device, and may also be a functional module in the first network device, where the functional module is used to implement the method described in any possible implementation manner in the foregoing embodiments. For example, still referring to fig. 10, the communication device 100 includes: a receiving module 12, configured to receive a first registration request message from a user equipment; a sending module 13, configured to send 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 for indicating the support capability of the VoNR and/or the support capability of the VoEF-only.

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

In some possible embodiments, still referring to fig. 10, which is shown in dashed lines, the apparatus 100 further comprises: a processing module 13 for enabling a first capability; the sending module is further 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 of the user equipment is enabled.

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

The embodiment of the present application provides a communication apparatus, which may be a chip or a system on a chip in a user equipment, or may also be a functional module in the user equipment for implementing the method described in any possible implementation manner in the foregoing embodiment. For example, still referring to fig. 10, the communication device 100 includes: a receiving module 12, configured to receive a first cancellation message sent by a third network device; the first cancellation message is used for indicating to cancel the first IMS voice service of the user equipment, the first cancellation message comprises 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 an S1 mode or an E-UTRA capability.

In some possible embodiments, still referring to fig. 10, the apparatus 100 further comprises: a sending module 11, configured to send a first message to a third network device, where the first message is used to trigger a first IMS voice service; or, the receiving module is further configured to receive the first message from the third network device.

In still other possible embodiments, still referring to fig. 10, which is shown in phantom, the apparatus 100 further comprises: and the processing module 13 is 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, which may be a chip or a system on a chip in a third network device, and may also be a functional module in the third network device, where the functional module is used to implement the method described in any possible implementation manner in the foregoing embodiments. For example, still referring to fig. 10, the communication device 100 includes: a sending module 11, configured to send a first cancellation message to a user equipment; the first cancellation message is used for indicating to cancel a first IMS voice service of the user equipment, the first cancellation message includes failure reason information of the first IMS voice service, the failure reason information is used for indicating that a first capability of the user equipment is disabled, and the first capability is an S1 mode or an E-UTRA capability.

In some possible embodiments, still referring to fig. 10, which is shown in solid lines, the apparatus 100 further comprises: a receiving module 12, configured to receive a first message from a user equipment, where the first message is used to trigger a first IMS voice service; or, the sending module is further configured to send the first message to the user equipment.

An embodiment of the present application provides a communication apparatus, which may be a chip or a system on a chip in a fourth network device, and may also be a functional module in the fourth network device, where the functional module is used to implement the method described in any possible implementation manner in the foregoing embodiments. For example, referring to fig. 10, the communication device 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 to establish a QoS flow for the first IMS voice service of the user equipment; a sending module 11, 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, where the failure cause information is used to indicate that a first capability of the user equipment is disabled, and the first capability is an S1 mode or an E-UTRA capability.

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

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

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

The embodiment of the present application provides a communication apparatus, which may be a chip or a system on a chip in user equipment, and may also be a functional module in the user equipment, configured to implement the method described in any possible implementation manner in the foregoing embodiments. For example, referring to fig. 10, the communication device 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 an IMS voice service, a first capability of a user equipment is disabled, and the first capability is an S1 mode capability or an E-UTRA capability; a processing module 13 for enabling the first capability.

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

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

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

Alternatively, when the communication device is located in or is an AMF, the processor 1101 may be configured to execute codes or applications stored in the memory 1102 to implement the steps of the AMF in the above method embodiments. For a specific implementation process, reference is made to the above embodiments, which are not described herein again.

Optionally, when the communication apparatus is located in or is an access network device, the processor 1101 may be configured to execute codes or application programs stored in the memory 1102 to implement the steps of the access network device (e.g., the gNB) in the above method embodiment. For a specific implementation process, reference is made to the above embodiments, which are not described herein again.

Alternatively, when the communication device is located in 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 a specific implementation process, reference is made to the above embodiments, which are not described herein again.

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

Further, an input device 1104 may be used to receive commands and information. An input device 1104 may be connected to the processor 1101 by a bus 1103.

Further, output device 1105 may be used to output information, output device 1105 may be another peripheral output device than a monitor, and output device 1105 may also be connected to processor 1101 through bus 703.

Further, the memory 1102 stores therein computer-executable instructions for implementing the functions of the transmitting module 11, the receiving module 12 and/or the processing module 13 in fig. 10. The functions/implementation processes of the sending module 11, the receiving module 12 and/or the processing module 13 in fig. 10 may be implemented by the processor 1101 in fig. 11 calling the computer execution instructions stored in the memory 1102, and the specific implementation processes and functions are referred to the above related embodiments.

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

Embodiments of the present application provide a computer-readable storage medium, which stores instructions for executing the communication method according to the above embodiments and any possible implementation manner thereof when the instructions are executed on a computer.

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

Those of skill in the art will appreciate that the functions described in connection with the various illustrative logical blocks, modules, and algorithm steps described in the disclosure herein may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions described in 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 (e.g., 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. A data storage medium may be any available medium that can be accessed by one or more computers or one or more processors to retrieve instructions, code and/or data structures for implementation of the techniques described herein. The computer program product may include a computer-readable medium.

By way of example, and not limitation, such computer-readable storage media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, flash memory, or any other medium that can be used to store desired program code in the form of instructions or data structures and that can be accessed by a computer. Also, any connection is properly termed a computer-readable medium. For example, if the instructions are transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital Subscriber Line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. It should be understood, however, that the 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. Disk and disc, as used herein, includes Compact Disc (CD), laser disc, optical disc, digital Versatile Disc (DVD), and blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.

The instructions may be executed by one or more processors, such as 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 circuitry. 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 incorporated in a combined codec. Also, 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 (e.g., a chipset). Various components, modules, or units are described in this application 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 a codec hardware unit, in conjunction with suitable software and/or firmware, or provided by an interoperating hardware unit (including one or more processors as described above).

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

The above description is only an exemplary embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

A method of communication, comprising:

user equipment sends a first registration request message to first network equipment, wherein the first network equipment is positioned in a first 5G network;

the user equipment receives a first registration response message from the first network equipment, wherein the first registration response message comprises first capability information;

the first capability information is used for representing the support capability of the new wireless NR for carrying the Internet protocol multimedia subsystem IMS voice VoNR and/or the support capability of the evolved packet System fallback-only EPS fallback for carrying the IMS voice VoEF-only.
The method of claim 1, the first registration response message comprising a 5G system network characteristics support information element, the 5G system network characteristics support information element comprising the first capability information.
The method according to claim 1 or 2, the first capability information being located in the fourth and/or fifth bit of the fifth octet of the 5G system network characteristics support information element.
The method according to any of claims 1 to 3, wherein 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 for indicating that VoNR is not supported.
The method according to any one of claims 1 to 3, wherein 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 method according to any of claims 1 to 3, wherein the first capability information comprises a first field for indicating VoNR support capability of the current network and a second field for indicating VoEF support capability of EPS fallback carrying IMS voice.
The method of 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 represents that VoNR is not supported or 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 or VoEF-only is not supported.
The method according to any of claims 1 to 7, if 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 method further comprising:

the user equipment enables the first capability and sends a second registration request message to the first network equipment, wherein the second registration request message comprises first indication information, the first indication information is used for indicating that the first capability is enabled, and the first capability is S1 mode and/or evolved universal terrestrial radio access (E-UTRA) capability.
The method according to any of claims 1 to 7, if the first capability of the ue is disabled and the first capability information indicates that VoNR is not supported or VoEF-only is supported, wherein the first capability is S1 mode and/or E-UTRA capability;

the method further comprises the following steps:

the user equipment sends a third registration request message to second network equipment;

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

the method further comprises the following steps:

and the user equipment sends a fourth registration request message to second network equipment, wherein the second network equipment is positioned in a 2G or 3G network.
The method of any of claims 8 to 10, further comprising:

the user equipment disables the first capability;

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

a first network device receives a first registration request message from user equipment, wherein the first network device is positioned in a first 5G network;

the first network equipment sends a first registration response message to the user equipment, wherein the first registration response message comprises first capability information;

the first capability information is used for representing the support capability of the new wireless NR for carrying the Internet protocol multimedia subsystem IMS voice VoNR and/or the support capability of the evolved packet System fallback-only EPS fallback for carrying the IMS voice VoEF-only.
The method of claim 12, the first registration response message comprising a 5G system network characteristics support information element, the 5G system network characteristics support information element comprising the first capability information.
The method according to claim 12 or 13, the first capability information being located in the fourth and/or fifth bit of the fifth octet of the 5G system network characteristics support information element.
The method according to any of claims 12 to 14, wherein when the first capability information is a first value, the first capability information is used to indicate VoNR support; when the first capability information is a second value, the first capability information is used for indicating that VoNR is not supported.
The method according to any one of claims 12 to 14, wherein when the first capability information is a third value, the first capability information is used to indicate support of VoEF-only; when the first capability information is a fourth value, the first capability information indicates that VoEF-only is not supported.
The method according to any of claims 12 to 14, wherein the first capability information comprises a first field for indicating a support capability of the current network VoNR and a second field for indicating a support capability of EPS fallback carrying voice over IMS, voEF.
The method of claim 17, when the first field indicates no VoNR is supported and the second field indicates VoEF is supported, the first capability information indicates no VoNR is supported or 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 or VoEF-only is not supported.
A method of communication, comprising:

the method comprises the steps that user equipment sends a first registration request message to first network equipment, wherein the first registration request message comprises second indication information, the second indication information is used for indicating that first capability of the user equipment is disabled, the first capability is S1 mode and/or E-UTRA capability, and the first network equipment is located in a first 5G network;

the UE receives a first registration rejection message sent by the first network device, wherein the first registration rejection message comprises rejection reason information, and the rejection reason information is used for indicating that the first 5G network does not support a new radio NR bearer Internet protocol multimedia subsystem (IMS) voice VoNR or supports an evolved packet system fallback (EPS fallback) bearer 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 equipment, wherein the second registration request message comprises first indication information, and the first indication information is used for indicating that the first capability of the user equipment is enabled.
The method of claim 19, further comprising:

the user equipment sends third registration request information to second network equipment, and the second network equipment is positioned in a second 5G network;

and the user equipment receives a second registration response message from the second network equipment, wherein the second registration response message comprises second capability information, and the second capability information indicates that the new radio NR bearer Internet protocol multimedia subsystem IMS voice is supported or VoEF-only is not supported.
The method of claim 19, further comprising:

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

the user equipment disables the first capability;

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

a first network device receives a first registration request message from a user equipment, wherein the first registration request message comprises second indication information, the second indication information is used for indicating that a 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 a first 5G network;

the first network equipment sends a first registration rejection message to the user equipment, wherein the first registration rejection message comprises rejection reason information, and the rejection reason information is used for indicating that the first 5G network does not support a new wireless NR bearer Internet protocol multimedia subsystem (IMS) voice VoNR or supports an evolved packet system fallback (EPS) bearer IMS voice VoEF-only.
A method of communication, comprising:

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

wherein the first cancel message is used to indicate to cancel a first internet protocol multimedia subsystem, IMS, voice service of the ue, and the first cancel message includes a service cancel reason message, where the service cancel reason message is that a first capability of the ue is disabled, and the first capability is an S1 mode or an evolved universal terrestrial radio access, E-UTRA, capability.
The method of claim 25, further comprising:

the user equipment sends a first message to the third network equipment, wherein the first message is used for triggering the first IMS voice service; or,

the user equipment receives the first message from the third network equipment.
The method of claim 25 or 26, the user equipment comprising an access AS layer and a non-access NAS layer; the method further comprises the following steps:

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, wherein the first cell is an NR cell supporting a new wireless NR to carry IMS voice VoNR or an NR cell not supporting an EPS fallback-only to carry IMS voice VoEF-only; or the like, or a combination thereof,

the user equipment initiates a registration process in a second cell, wherein the second cell is a global system for mobile communication (GSM) cell or a global terrestrial radio access (UTRA) cell.
The method of any of claims 25 to 29, further comprising:

the user equipment disables the first capability;

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

when the user equipment disables the N1mode, the user equipment starts a timer;

when the timer is expired, the user equipment enables the N1 mode.
A communication device, comprising:

the third network equipment sends a first cancellation message to the user equipment;

wherein the first cancel message is used to indicate to cancel a first internet protocol multimedia subsystem, IMS, voice service of the user equipment, and the first cancel message includes failure cause information of the first IMS voice service, where the failure cause information is used to indicate that a first capability of the user equipment is disabled and a first capability of the user equipment is disabled, and the first capability is an S1 mode or evolved universal terrestrial radio access, E-UTRA, capability.
The method of claim 32, further comprising:

the third network equipment receives a first message from the user equipment, wherein the first message is used for triggering the first IMS voice service; or,

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

and the third network equipment sends a second message to the first network equipment, wherein the second message is used for triggering the establishment of the QoS flow for the first IMS voice service.
The method of claims 32 to 34, the method comprising:

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

the fourth network equipment receives a fourth message from the first network equipment, wherein the fourth message is used for requesting to establish a QoS flow for a 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, where the failure cause information is used to indicate that a first capability of the user equipment is disabled, and the first capability is an S1 mode or an evolved universal terrestrial radio access E-UTRA capability.
A method of communication, comprising:

receiving, by a user equipment, a sixth message from a fourth network device, where the sixth message includes third capability information, where the third capability information is used to indicate that a current cell of the user equipment does not support new wireless NR bearer internet protocol multimedia subsystem IMS voice VoNR or support evolved packet system fallback only EPS fallback bearer IMS voice VoEF-only, and a first capability of the user equipment is disabled, where the first capability is an 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, wherein the first cell supports VoNR or does not support VoEF-only;

the user equipment initiates a registration process in a second cell, wherein 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, the user equipment comprising an access AS layer and a non-access NAS layer;

the user equipment enabling the first capability, comprising: the NAS layer enables the first capability;

the method further comprises the following steps: the NAS layer instructs the AS layer to continue camping on the current cell.
A method of communication, comprising:

the fourth network equipment sends a sixth message to the user equipment, wherein the sixth message comprises third capability information, the third capability information is used for indicating that the current cell of the user equipment does not support new wireless NR to carry Internet protocol multimedia subsystem (IMS) voice VoNR or supports evolved packet system fallback-only (EPS fallback) to carry 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.
A method of communication, comprising:

receiving, by a user equipment, a second cancel message from a third network device, the second cancel message being used to indicate to cancel a first internet protocol multimedia subsystem, IMS, voice service of the user equipment, a first capability of the user equipment being disabled, the first capability being an S1 mode or evolved universal terrestrial radio access, E-UTRA, capability;

when the number of times that the user equipment receives a cancellation message is equal to or greater than a preset threshold value and a quality of service (QoS) flow of the first IMS voice service is not established, enabling the first capability by the user equipment, and sending a second registration request message to first network equipment, wherein the second registration request message comprises first indication information, the first indication information is used for indicating that the first capability is enabled, and the first network equipment is located in a first 5G network; or,

when the number of times that the user equipment receives a cancel message is equal to or greater than a preset threshold value and a quality of service (QoS) flow of the first IMS voice service is not established, the user equipment sends a third registration request message to second network equipment, the second network equipment is located in a second 5G network, and the second 5G network supports a new wireless NR to carry an Internet protocol multimedia subsystem (IMS) voice VoNR or does not support an evolved packet system fallback (EPS) to carry IMS voice VoEF-only; or,

and when the times of receiving the cancel message by the user equipment is equal to or greater than a preset threshold value and the QoS flow of the first IMS voice service is not established, the user equipment sends a fourth registration request message to second network equipment, wherein the second network equipment is positioned in a 2G network or a 3G network.
The method of claim 40, further comprising:

the user equipment sends a first message to the third network equipment, wherein the first message is used for triggering the first IMS voice service; or,

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

the user equipment disables the first capability;

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

a user equipment sends a first message to a first network equipment, wherein the first message is used for triggering an internet protocol multimedia subsystem (IMS) voice service, a first capability of the user equipment is disabled, and the first capability is an S1 mode capability or an 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 a first capability of a user equipment is disabled and the user equipment is a voice center, enabling the first capability by the user equipment, and sending a second registration request message to a first network equipment, wherein the second registration request message comprises first indication information, the first indication information is used for indicating that the first capability is enabled, the first network equipment is located in a first 5G network, and the first capability is an S1 mode capability or an evolved universal terrestrial radio access (E-UTRA) capability; or the like, or a combination thereof,

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 second network equipment, wherein the second network equipment is located in a second 5G network, and the second 5G network supports a new wireless NR to carry an Internet protocol multimedia subsystem (IMS) voice VoNR or does not support an evolved packet system fallback to carry an IMS voice VoEF-only; or,

and 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 second network equipment, and the second network equipment is located in a 2G network or a 3G network.
The method of claim 45, further comprising:

the user equipment disables the first capability;

the user equipment disables the N1 mode.
A communication device for performing the communication method of any one of claims 1 to 46.
A communication system, comprising: access network equipment, an access and mobility management function AMF and an internet protocol multimedia subsystem IMS;

the AMF for performing the communication method of any one of claims 12 to 18 and 24;

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

the IMS for performing the communication method of any of claims 32 to 35.