CN113923726A

CN113923726A - Method for implementing voice service, storage medium and terminal

Info

Publication number: CN113923726A
Application number: CN202111215673.5A
Authority: CN
Inventors: 许勇
Original assignee: Sichuan Innogence Technology Co Ltd
Current assignee: Sichuan Innogence Technology Co Ltd
Priority date: 2021-10-19
Filing date: 2021-10-19
Publication date: 2022-01-11

Abstract

The invention discloses a method for realizing voice service, a storage medium and a terminal, which relate to the technical field of communication, and the method comprises the following steps: judging whether the network supports VoNR or not and whether an N26 interface exists or not at a network element AMF; if the network does not support VoNR and does not have an N26 interface, the network element AMF directly triggers a redirected fallback mode to the LTE network; if the network supports VoNR, the network element AMF initiates a flow of realizing the voice service based on VoNR; if the network does not support the VoNR and the network has an N26 interface, the network element AMF directly triggers the fallback mode of the handover to the LTE network. The invention advances the decision point of the 5G voice service implementation mode from the base station of the access network to the core network element AMF, when the network is not provided with a VoNR system and is not provided with an N26 interface, the 5G and LTE networks can not operate mutually, the voice service implementation mode only adopts a redirection mode to fall back to the LTE network, the network element AMF can directly initiate a redirection request to the access network without transferring through the base station, and the voice fall-back time delay is reduced.

Description

Method for implementing voice service, storage medium and terminal

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method, a storage medium, and a terminal for implementing a voice service.

Background

The voice service is a basic function provided by a wireless communication network to a user, and the basic function is provided for the user from the earliest 2G/3G network, but as the network architecture continuously evolves, starting from a Long Term Evolution (LTE) mobile communication system, an IP Multimedia Subsystem (IMS) is newly introduced to implement a mode of carrying the voice service on an IP network, i.e., a mode of voice over LTE, and has a substantial difference from the voice service of a circuit switching domain provided by the 2G/3G network.

When the network is developed to a 5G NR (New Radio) network, the implementation scheme of the voice service is shown in fig. 1, and a mode that LTE carries the voice service through an IP network is adopted. Because of the difference of network architectures, two design schemes exist for implementing the 5G voice service. The first is that the user realizes voice service with the IMS system through the access network and core network of the 5G network, i.e. vonr (voice over nr). The second is that voice service falls back from the NR network to the LTE network through an eps (evolved Packet system) Fallback solution, and the existing VoLTE system of the LTE network is used to provide voice service to the user.

At the initial stage of 5G network construction, the coverage of the 5G base station and the permeability of the terminal are not high, and most of voice services are implemented in an EPS Fallback manner, specifically, as shown in fig. 2, the decision right of the 5G voice scheme is on the network side, and the voice service and the data service of the NR user fall back to the LTE network at the same time, so that although the controllability of the network can be ensured, the decision time of the network is late, before that, there are many interactions between the UE and the 5G network and the IMS, which may cause a long time delay for voice call setup, a long time delay for voice connection of 3 to 4 seconds, and delay the measurement and switching process mainly consumed when the LTE network falls back, and on the other hand, the data service rate based on the LTE network may be reduced relative to the NR network.

Disclosure of Invention

The present invention is directed to a method, a storage medium, and a terminal for implementing a voice service, which can alleviate the above problems.

In order to alleviate the above problems, the technical scheme adopted by the invention is as follows:

in a first aspect, the present invention provides a method for implementing a voice service in a communication network, including: judging whether the network supports VoNR or not and whether an N26 interface exists or not at a network element AMF; if the network does not support VoNR and does not have an N26 interface, the network element AMF directly triggers a redirected fallback mode to the LTE network; if the network supports VoNR, the network element AMF initiates a flow of realizing the voice service based on VoNR; if the network does not support the VoNR and the network has an N26 interface, the network element AMF directly triggers the fallback mode of the handover to the LTE network.

In a preferred embodiment of the present invention, if the network element AMF directly triggers the redirection fallback mode to the LTE network, it needs to directly send a message of the UE context release command to the NG-RAN to indicate that the voice falls back to the LTE network.

In a preferred embodiment of the present invention, the message of the UE context release command carries a reason value for redirection.

In a preferred embodiment of the present invention, before the network element AMF decision, the implementation method further includes:

the UE resides in an NG-RAN of the 5G network and establishes PDU session connection with an IMS domain;

the UE sends an Invite signaling request to the IMS;

the IMS domain and the core network interact AAR/AAA signaling to trigger the establishment of the voice service special QoS flow.

In a preferred embodiment of the present invention, if the network element AMF directly triggers the redirection fallback mode to the LTE network, the implementation method further includes:

after receiving the message of the UE context release command, the NG-RAN sends an RRC release request message to the UE, and carries an instruction to redirect to a frequency point of an adjacent LTE cell;

the NG-RAN returns a message of completing the UE context release to the network element AMF;

after receiving the RRC release request message, the UE selects an LTE cell, re-initiates a network access request to access the LTE network, and starts to establish a voice dedicated bearer.

In a second aspect, the present invention provides a computer readable storage medium having stored therein program instructions, which when executed by a processor, implement the method described above.

In a third aspect, the present invention provides a terminal, including a processor and a memory, where the processor is electrically connected to the memory, and the memory is used for storing instructions and data; the processor is configured to perform the above method.

Compared with the prior art, the invention has the beneficial effects that:

a decision point of a 5G voice service implementation mode is advanced from a base station of an access network to a core network element AMF, when a VoNR system is not deployed in the network and an N26 interface is not configured, the 5G and LTE networks cannot operate mutually, the voice service implementation mode is returned to the LTE network only by adopting a redirection mode, and the network element AMF can directly initiate a redirection request to the access network without transferring through the base station, so that the interaction of signaling between the network elements is reduced, and the voice return delay is reduced.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic diagram of a voice service implementation process in the prior art;

fig. 2 is a schematic flow chart of implementation of voice service redirection based on EPS fallback in the prior art;

fig. 3 is a schematic flow chart of implementing the voice service redirection based on EPS fallback in the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 3, the embodiment of the present invention optimizes the flow of the redirection mode of EPS Fallback voice, and advances the decision point to the AMF decision, compared with the flow shown in fig. 2, to reduce the signaling message interaction between the core network and the base station, thereby achieving the purpose of reducing the Fallback delay. The specific flow of implementing the voice service based on the EPS fallback redirection is as follows:

step 301: the UE resides on the NG-RAN of the 5G system and performs initialization of MO/MT IMS voice session establishment, namely PDU session connection establishment with an IMS domain.

Step 302: to initiate voice traffic, the UE sends an Invite signaling request to the IMS.

Step 303: the IMS domain and the core network interact AAR/AAA signaling to trigger the establishment of the voice service special QoS flow.

Step 304: and the core network element AMF judges that the voice can only be redirected to the LTE network according to whether the network supports VoNR and has no N26 interface.

Step 305: and the network element AMF directly sends a message of the UE context release command to the access network, carries the redirected cause value and indicates that the voice falls back to the LTE network.

Step 306: and after receiving the release message, the NG-RAN sends an RRC release request message to the UE, and carries the frequency point for indicating redirection to the adjacent LTE cell.

Step 307: the NG-RAN returns a message to the AMF that the UE context release is complete.

Step 308: after receiving the request of RRC redirection, the UE selects an LTE cell, re-initiates a network access request to access the LTE network, and starts to establish a voice dedicated bearer.

The embodiment of the invention removes the process that the network element AMF shown in figure 2 sends the PDU session modification request message to the access network NG-RAN and waits for the return message, and the decision point of the voice scheme is advanced to the network element AMF.

In the embodiment of the invention, the network judges whether the network supports VoNR at the AMF, and an N26 interface is not configured, the AMF can directly initiate the process of redirecting to the LTE, indicate voice to fall back to the LTE network, and send a message of a UE context release command to the access network, wherein the message carries the reason value of redirection. In this way, the interaction of signaling between network elements is reduced. Thereby achieving the purpose of optimizing the time delay of voice service initiation.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for implementing voice service of communication network is characterized by comprising the following steps: judging whether the network supports VoNR or not and whether an N26 interface exists or not at a network element AMF; if the network does not support VoNR and does not have an N26 interface, the network element AMF directly triggers a redirected fallback mode to the LTE network; if the network supports VoNR, the network element AMF initiates a flow of realizing the voice service based on VoNR; if the network does not support the VoNR and the network has an N26 interface, the network element AMF directly triggers the fallback mode of the handover to the LTE network.

2. The method of claim 1, wherein if the AMF directly triggers a redirection fallback mode to the LTE network, a message of a UE context release command needs to be directly sent to the NG-RAN to indicate that the voice falls back to the LTE network.

3. The method of claim 2, wherein the message of the UE context release command carries a cause value for redirection.

4. The method of claim 3, wherein before the network element AMF decision, the method further comprises:

the UE sends an Invite signaling request to the IMS;

5. The method for implementing voice service over a communication network according to claim 4, wherein if the network element AMF directly triggers a redirection fallback mode to the LTE network, the method further comprises:

6. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored therein program instructions, which when executed by a processor, implement the method of any one of claims 1-5.

7. A terminal is characterized by comprising a processor and a memory, wherein the processor is electrically connected with the memory, and the memory is used for storing instructions and data; the processor is configured to perform the method of any one of claims 1-5.