CN115996362A

CN115996362A - Voice service recovery method, device and system

Info

Publication number: CN115996362A
Application number: CN202111209105.4A
Authority: CN
Inventors: 李勇
Original assignee: China Mobile Communications Group Co Ltd; China Mobile Group Sichuan Co Ltd
Current assignee: China Mobile Communications Group Co Ltd; China Mobile Group Sichuan Co Ltd
Priority date: 2021-10-18
Filing date: 2021-10-18
Publication date: 2023-04-21

Abstract

The embodiment of the specification discloses a voice service recovery method, a device and a system, which can rapidly carry out disaster recovery processing under the scene of carrying out voice service in EPSFallback or VoNR modes and the like, realize rapid recovery of voice service and ensure continuity of voice service. The method comprises the following steps: receiving an AAR message sent by a P-CSCF node through an Rx interface, wherein the AAR message is sent when the P-CSCF node analyzes the newly added NR access information in a PANI header field of an INVITE request message initiated by UE; based on the AAR message, an AAA message is returned to the P-CSCF node, wherein the AAA message carries the access network type of the UE; based on the access network type of the UE, interacting with an SMF node through an N7 interface to trigger the establishment Flow of the voice special QoS Flow; and when detecting that the Rx interface fails, locking the N7 interface to trigger the SMF node to reselect other PCF nodes.

Description

Voice service recovery method, device and system

Technical Field

The present document relates to the field of communications technologies, and in particular, to a method, an apparatus, and a system for recovering a voice service.

Background

Disaster recovery is also called off-site disaster recovery or geographical disaster recovery, and refers to two sites located at different geographical locations, wherein when one site fails to provide service due to uncontrollable factors such as natural disasters, war, power failure, and the like, the other site can take over registration and session services. The disaster recovery scheme is beneficial to providing the reliability of the IP multimedia subsystem (IP Multimedia Subsystem, IMS) network, enhancing the capability of handling sudden natural disasters and the network self-recovery capability, and avoiding the occurrence of large-scale service interruption when serious disaster occurs.

In the current fifth generation of mobile communication technology (5 ^th Generation Mobile Communication Technology, 5G) in the scenario where the user performs voice traffic using EPSFallback (fallback from 5G to 4G) or VoNR (Voice over New Radio), the policy control function (Policy Control Function, PCF) node is responsible for receiving a request message triggered by a Proxy-call session control function (Proxy-Call Session Control Function, P-CSCF) node and informing the session management function (Session Management Function, SMF) node of creating a voice-specific quality of service Flow (Quality of Service Flow, qoS Flow). For disaster recovery processing of such voice service scenarios, a plurality of PCF nodes are generally adopted, and after an Rx session between one PCF node and a P-CSCF node is interrupted, the P-CSCF node actively switches to connect with other PCF nodes. However, since the SMF node is still connected to the original PCF node, this will cause the calling and called voice traffic to fail.

Therefore, there is a need for a better disaster recovery processing scheme for the above-mentioned voice service scenario to realize rapid recovery of the voice service and ensure continuity of the voice service.

Disclosure of Invention

An embodiment of the present disclosure is to provide a method, an apparatus, and a system for recovering a voice service, so as to quickly perform disaster recovery processing in a scenario of performing a voice service in an EPSFallback or VoNR manner, thereby implementing quick recovery of the voice service and ensuring continuity of the voice service.

In order to achieve the above object, the embodiment of the present specification adopts the following technical solutions:

in a first aspect, a method for recovering a voice service is provided, which is applied to a PCF node with a policy control function, and the method includes:

receiving an Answer Authentication Request (AAR) message sent by a proxy call session control function (P-CSCF) node through an Rx interface, wherein the AAR message is sent when the P-CSCF node analyzes new air interface NR access information in an access network information (PANI) header field of an INVITE request message initiated by User Equipment (UE);

based on the AAR message, returning a response authentication response (AAA) message to the P-CSCF node, wherein the AAA message carries the access network type of the UE;

based on the access network type of the UE, interacting with a session management function SMF node through an N7 interface to trigger the establishment Flow of a voice special quality of service (QoS) Flow;

and when detecting that the Rx interface fails, locking the N7 interface to trigger the SMF node to reselect other PCF nodes.

In a second aspect, a voice service recovery apparatus is provided, applied to a PCF node of a policy control function, where the apparatus includes:

a receiving unit, configured to receive, through an Rx interface, an answer authentication request AAR message sent by a proxy call session control function P-CSCF node, where the AAR message is sent when the P-CSCF node parses access network information PANI header field of an INVITE request message initiated by a user equipment UE to newly add new air interface NR access information;

A reply authentication response unit, configured to return a reply authentication response AAA message to the P-CSCF node based on the AAR message, where the AAA message carries an access network type of the UE;

the triggering unit is used for interacting with the session management function SMF node through an N7 interface based on the access network type of the UE so as to trigger the establishment flow of the voice special service quality stream QoSFlow;

and the interface locking unit is used for locking the N7 interface when detecting that the Rx interface fails so as to trigger the SMF node to reselect other PCF nodes.

In a third aspect, a voice service recovery system is provided, including: a P-CSCF node, an SMF node and a plurality of PCF nodes;

the P-CSCF node is used for receiving the INVITE request message initiated by the UE and analyzing the received INVITE request message to identify whether NR access information is newly added in the PANI header domain of the INVITE request message, if so, the PANI header domain sends an AAR message to a first PCF node in the PCF nodes through the DRA node;

the PCF is configured to receive, through an Rx interface, an AAR message sent by the P-CSCF node, return, based on the AAR message, a response authentication response AAA message carrying an access network type of the UE to the P-CSCF node, and interact, through an N7 interface and a session management function SMF node, with the access network type of the UE, to trigger an establishment procedure of a voice dedicated quality of service QoS Flow, and lock the N7 interface when detecting that the Rx interface fails;

The SMF node is configured to trigger an establishment procedure of a voice dedicated quality of service (QoS) Flow through interaction with the first PCF node, and reselect a second PCF node when an N7 interface of the first PCF node is in a locked state, where the first PCF node and the second PCF node are different PCF nodes in the plurality of PCF nodes.

In a fourth aspect, there is provided an electronic device comprising:

a processor;

a memory for storing the processor-executable instructions;

wherein the processor is configured to execute the instructions to implement the method according to the first aspect.

In a fifth aspect, there is provided a computer readable storage medium, which when executed by a processor of an electronic device, enables the electronic device to perform the method of the first aspect.

According to the scheme of the embodiment of the specification, the Rx interface of the PCF node is linked with the N7 interface, and when the Rx interface of the PCF node fails, the N7 interface of the PCF node is actively locked to trigger the SMF node to reselect other PCF nodes, so that the quick recovery of voice service is realized, and the continuity of the voice service is ensured.

Drawings

The accompanying drawings, which are included to provide a further understanding of the specification, illustrate and explain the exemplary embodiments of the present specification and their description, are not intended to limit the specification unduly. In the drawings:

Fig. 1 is a schematic diagram of a disaster recovery processing scheme for a 5G voice service in the related art;

FIG. 2 is a schematic diagram of an applicable implementation environment of a method for recovering voice services according to an embodiment of the present disclosure;

fig. 3 is a schematic flow chart of a voice service recovery method according to an embodiment of the present disclosure;

fig. 4 is a schematic flow chart of a voice service recovery method according to another embodiment of the present disclosure;

fig. 5 is a schematic interaction diagram of each node in a voice service recovery system according to an embodiment of the present disclosure;

fig. 6 is a schematic structural diagram of a voice service recovery device according to an embodiment of the present disclosure;

fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present disclosure.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the present specification more apparent, the technical solutions of the present specification will be clearly and completely described below with reference to specific embodiments of the present specification and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present specification. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are intended to be within the scope of the present disclosure.

As described above, in the scenario that the current 5G user performs voice service in an EPSFallback or VoNR manner, the PCF node is responsible for receiving a request message triggered by a P-CSCF node by a call and notifying the SMF node to create a voice-specific quality of service QoS Flow. For disaster recovery processing of such voice service scenarios, a plurality of PCF nodes are generally adopted, and after an Rx session between one PCF node and a P-CSCF node is interrupted, the P-CSCF node actively switches to connect with other PCF nodes. However, since the SMF node is still connected to the original PCF node, this will cause the calling and called voice traffic to fail.

Illustratively, as shown in fig. 1, PCF node 1 is connected to a routing agent (Diameter Routing Agent, DRA) node (including DRA node 1 and DRA node 2) through an Rx interface, and a request message triggered by a P-CSCF node is sent to PCF node 1 via the DRA node. When the connection between PCF node 1 and DRA is interrupted, the P-CSCF node may actively switch to connect with PCF node 2 via the DRA node, but the SMF node is still connected to the N7 interface of PCF node 1, which would result in failure of the calling and called voice traffic.

Therefore, the embodiment of the specification aims to provide a better disaster recovery processing scheme aiming at the voice service scene, by linking the Rx interface of the PCF node with the N7 interface, when the Rx interface of the PCF node fails, the N7 interface of the PCF node is actively locked to trigger the SMF node to reselect other PCF nodes, thereby realizing the quick recovery of the voice service and ensuring the continuity of the voice service.

The following describes in detail the technical solutions provided by the embodiments of the present specification with reference to the accompanying drawings.

First, an implementation environment to which a voice service restoration method according to an embodiment of the present disclosure is applicable will be described with reference to fig. 2. As shown in fig. 2, an implementation environment to which the voice service restoration method according to the embodiments of the present disclosure is applicable may include a User Equipment (UE), a P-CSCF node, a DRA node, a PCF node, and an SMF node, where the PCF node is connected to the DRA node through an Rx interface and is connected to the SMF node through an N7 interface.

Based on the implementation environment, the voice call procedure of the 5G voice EPS Fallback or VoNR is as follows: firstly, a UE initiates an initial INVITE request message, a P-CSCF node analyzes access network information PANI header fields of a calling user after receiving the INVITE request message and identifies whether the PANI header fields are newly added with New air interface (NR) access information, such as 3GPP-NR parameters, 3GPP-NR-FDD parameters or 3GPP-NR-TDD parameters, if the PANI header fields are identified to be newly added with NR access information, a response authentication request (Answer Auth Answer, AAR) message is sent to a PCF node, and the AAR message is sent to the PCF node through a DRA node; then, the PCF node returns a response authentication response (Answer Auth Answer, AAA) message to the P-CSCF node, the AAA message is sent to the P-CSCF node through the DRA node, and the AAA message carries information such as the access network type of the UE; then, the PCF node interacts with the SMF node through the N7 interface to trigger an establishment procedure of the voice-specific quality of service QoS Flow, and when the establishment procedure reaches the NGRAN (5G radio access network), the NGRAN determines whether to initiate EPS Fallback or VoNR based on the configuration.

Further, the implementation environment may further include a user plane function (User Plane Function, UPF) node, where the UPF node may receive user plane traffic flow data flow splitting from the SMF node and implement data flow splitting according to pre-established rules (rules), where the rules may include, but are not limited to, packet discovery rules (Packet Detection Rules, PDRs) for identifying packets, forwarding rules (Forwarding Action Rules, FARs) for forwarding packets, processing rules (Buffering Action Rules, BARs) for processing packets, marking rules (QoS Enforcement Rules, QERs) for marking packets, and reporting rules (Usage Reporting Rules, URRs) for reporting packets.

In the voice call process, if the Rx interface of the PCF node fails to cause the link between the PCF node and the DRA node to be interrupted, the PCF node cannot receive the AAR request message triggered by the P-CSCF node due to the UE call, and when a plurality of PCF nodes are deployed, the P-CSCF node can be actively switched to be connected with other PCF nodes. Therefore, through linking the Rx interface and the N7 interface of the PCF node, when the Rx interface of the PCF node fails, the N7 interface of the PCF node is actively locked to trigger the SMF node to reselect other PCF nodes, so that the SMF node and the P-CSCF node can be switched to be connected with other PCF nodes, thereby realizing the quick recovery of voice service and ensuring the continuity of the voice service. Based on the implementation environment shown in fig. 2, as shown in fig. 3, an embodiment of the present disclosure provides a voice service recovery method, which is applicable to the PCF node shown in fig. 2. Referring to fig. 3, a flowchart of a voice service recovery method according to an embodiment of the present disclosure is provided, where the method may include:

S302, the AAR message sent by the P-CSCF node is received through the Rx interface.

In the embodiment of the present disclosure, the AAR message is sent by the P-CSCF node when the P-CSCF node parses out the new NR access information in the PANI header field of the UE-initiated INVITE request message, where the AAR message is used to request to obtain the access network type of the UE from the PCF node. Wherein the newly added NR access information may include, for example, but not limited to, at least one of a 3GPP-NR parameter, a 3GPP-NR-FDD parameter, or a 3GPP-NR-TDD parameter, etc.

Specifically, as shown in fig. 2, the PCF node is connected to the DRA node through its Rx interface, and the AAR message sent by the P-CSCF node is sent to the link between the DRA node and the PCF node through the DRA node, so that the PCF node can obtain the AAR message sent by the P-CSCF node from the link through its Rx interface.

S304, based on the AAR message, the AAA message is returned to the P-CSCF node.

The AAA message carries the access network type of the UE. In the embodiment of the present disclosure, if the P-CSCF node configures an IMS signaling Rx interface subscription, an AAR/AAA procedure from the P-CSCF node to the PCF node is triggered, and in the AAA message, the PCF may carry information of the access network Type of the UE through IP-CAN-Type and RAT-TypeAVP.

Specifically, as shown in fig. 2, the AAA message returned by the PCF node is sent to the P-CSCF node via the DRA node.

S306, based on the access network type of the UE, the UE interacts with the SMF node through an N7 interface to trigger the establishment Flow of the voice special QoS Flow.

After the voice special QoS Flow flows to the NGRAN, the NGRAN can judge whether to initiate EPS Fall or VoNR Flow according to configuration so as to realize the voice call of the UE to the calling user. It should be noted that, the process of the PCF node interacting with the SMF node through the N7 interface to trigger the establishment of the voice-specific QoS Flow and the process of initiating the EPSFall or VoNR may be implemented by various technical means known to those skilled in the art, which will not be described herein.

And S308, when detecting that the Rx interface fails, locking the N7 interface to trigger the SMF node to reselect other PCF nodes.

After the Rx interface of the PCF node fails, the PCF node does not receive and process the message sent by the P-CSCF node any more, so that the P-CSCF node can be actively switched to be connected and communicated with other PCF nodes, and the access network type of the UE and the like can be acquired from the other PCF nodes. After the Rx interface of the PCF node is in a locking state, the PCF node does not receive and process the message sent by the SMF node any more, and further the SMF node can be triggered to reselect other PCF nodes, so that the establishment Flow of the voice special QoS Flow is triggered through interaction with the reselected PCF node, thereby avoiding the voice call service of the UE to the calling user from being interrupted, and ensuring the continuity of the voice service.

For example, as shown in fig. 4, when the Rx interface of the PCF node 1 is normal, after the P-CSCF node parses out the new NR access information of the access network information PANI header field of the calling user carried by the INVITE request message initiated by the UE, the AAR/AAA procedure from the DRA node to the PCF node 1 is triggered to obtain the information of the access network type of the UE. Then, PCF node 1 may interact with the SMF node through its own N7 interface to trigger the establishment procedure of the voice-specific QoS, and when the voice-specific QoS Flow flows to NGRAN, NGRAN may determine whether to initiate an EPS Fall or a VoNR procedure according to the configuration, so as to implement the voice call of the UE to the calling user. When the own Rx node fails, the PCF node 1 does not receive and process the message sent by the P-CSCF node any more, and then can trigger the P-CSCF node to be actively switched to be connected with the PCF node 2, and the DRA node requests to acquire the access network type of the UE from the PCF node 2 (as shown by the dotted arrows between the P-CSCF node and the DRA node 1 and between the DRA node 2 in fig. 4). In addition, PCF node 1 also latches its own N7 interface without receiving and processing the message sent by the SMF node, and further triggers the SMF node to reselect PCF node 2 to trigger the establishment Flow of the voice-specific QoS Flow through the interaction with PCF node 2 (as shown by the dashed arrow between the SMF node and PCF node 2 in fig. 4). It can be seen that, by linking the Rx interface and the N7 interface of the PCF node, when the Rx interface fails, the N7 interface is actively blocked, so that the Rx session and the N7 session can be synchronously switched to other PCF nodes, thereby avoiding the interruption of the voice call service of the UE to the calling user and ensuring the continuity of the voice service.

In the embodiment of the present disclosure, the PCF node may detect whether the Rx interface of itself fails in any suitable manner. In order to avoid connection flashover caused by Rx interface failure misjudgment, in an alternative embodiment, the PCF node may determine whether its own Rx interface fails by detecting whether links with all DRA nodes fail and the duration of the failure. Specifically, before S308 described above, the voice service restoration method provided in the embodiment of the present disclosure may further include: detecting whether a link between the P-CSCF node and the DRA node fails, wherein an AAR message sent by the P-CSCF node is sent to the link through the DRA node; when the link abnormality is detected, starting a preset timer to record the duration of the fault of the link; if the fault duration of the link exceeds the timing duration of the timer, determining that the Rx interface of the link is faulty. More specifically, if links between the PCF node and all DRA nodes fail and the duration of the failure exceeds the timing duration of the timer, it is determined that the Rx interface of the PCF node fails.

It should be noted that, the PCF node may detect whether the link between the PCF node and the DRA node is failed by various technical means known to those skilled in the art, which is not specifically limited in this embodiment of the present disclosure.

In another embodiment of the present disclosure, the method for recovering a voice service provided in the embodiment of the present disclosure may further include: if the link between the PCF node and the DRA node is detected to be normal before the timing duration of the timer is reached, the timer is controlled to stop. Therefore, the influence of the timing result of the timer on the Rx interface fault detection result of the PCF node can be avoided, and the accuracy of the Rx interface fault detection result is ensured.

According to the voice service recovery method provided by the embodiment of the specification, the Rx interface of the PCF node is linked with the N7 interface, and when the Rx interface of the PCF node fails, the N7 interface of the PCF node is actively locked to trigger the SMF node to reselect other PCF nodes, so that the quick recovery of voice service is realized, and the continuity of the voice service is ensured.

In order to ensure that the P-CSCF node can be switched to connect with other PCF nodes to further ensure continuity of the voice service and improve reliability of the voice service recovery process, in another embodiment of the present disclosure, after S308, the voice service recovery method provided in the embodiment of the present disclosure may further include: and controlling the N7 interface to be in a locking state, detecting whether the AAR message sent by the P-CSCF node is overtime or not by the Rx interface, and if so, returning an error response message containing a first error code to the P-CSCF node, wherein the first error code is used for indicating that the message sent by the P-CSCF node cannot be processed. The PCF node enables the P-CSCF node to actively reselect other PCF nodes by sending an error response message containing the first error code to the P-CSCF node.

Specifically, the P-CSCF node may notify a 5G core network (5 GC) to deactivate the UE and reselect the PCF based on the first error code. It should be noted that, the process of reselecting the PCF node by the P-CSCF node is a technology known to those skilled in the art, and will not be described herein.

To ensure that voice traffic can be switched back to the PCF node after its Rx interface is restored, the N7 interface of the PCF node can be manually restored. Specifically, in another embodiment of the present disclosure, after the step S308, the voice service recovery method provided in the embodiment of the present disclosure may further include: when the Rx interface is detected to be recovered to be normal, a recovery instruction for the N7 interface is received through a pre-set Man-Machine Language (MML) interface, and the N7 interface is recovered based on the received recovery instruction. The MML interface may be a preconfigured interface for a user to input instructions, configure parameters, and the like.

The embodiment of the specification also provides a voice service recovery system. In one embodiment of the present description, the system may include: a P-CSCF node, an SMF node, and a plurality of PCF nodes.

The P-CSCF node is configured to receive an INVITE request message initiated by a UE, and parse the received INVITE request message to identify whether NR access information is newly added in a PANI header field of the INVITE request message, and if so, send an AAR message to a first PCF node of the plurality of PCF nodes via a DRA node, as shown in fig. 5.

The PCF is configured to receive an AAR message sent by the P-CSCF node through an Rx interface, return a response authentication response (AAA) message carrying an access network type of the UE to the P-CSCF node based on the AAR message, interact with a Session Management Function (SMF) node through an N7 interface based on the access network type of the UE to trigger an establishment Flow of a voice special quality of service (QoS) Flow, and lock the N7 interface when detecting that the Rx interface fails.

According to the voice service recovery system provided by the embodiment of the specification, the Rx interface of the PCF node is linked with the N7 interface, and when the Rx interface of the PCF node fails, the N7 interface of the PCF node is actively locked to trigger the SMF node to reselect other PCF nodes, so that the quick recovery of voice service is realized, and the continuity of the voice service is ensured.

Optionally, the PCF node is further configured to control the N7 interface to be in a locked state, detect whether the Rx interface receives an AAR message sent by the P-CSCF node and times out, and if so, return an error response message including a first error code to the P-CSCF node, where the error response message is used to instruct the P-CSCF node to reselect other PCFs.

Optionally, the PCF node is further configured to receive a recovery instruction for the N7 interface through a preset man-machine language MML interface when detecting that the Rx interface is recovered to be normal after locking the N7 interface to trigger the SMF node to reselect the PCF node, and recover the N7 interface based on the received recovery instruction.

Optionally, the PCF node is further configured to detect, when the Rx interface is detected to fail, whether a link between the PCF node and a DRA node fails before locking the N7 interface, send the AAR message to the link via the DRA node, start a preset timer when the link is detected to be abnormal, record a duration of the failure of the link, and determine that the Rx interface fails if the duration of the failure exceeds a timing duration of the timer.

Optionally, the PCF node is further configured to, after starting a preset timer, control the timer to stop if the link is detected to be normal before the timing duration of the timer is reached.

Optionally, the PCF node is further configured to restore the N7 interface when the Rx interface is restored to normal;

the P-CSCF node is further configured to, after the N7 interface of the first PCF node returns to normal, send an AAR message to the first PCF node via the DRA node when it is identified that NR access information is newly added in a PANI header field of the INVITE request message if the INVITE request message sent by a newly-online UE is received;

the SMF node is further configured to interact with the N7 interface of the first PCF node based on the access network type of the newly-online UE after the N7 interface of the first PCF node is restored to be normal, so as to trigger an establishment Flow of a voice special quality of service (QoS) Flow for the newly-online UE.

It can be understood that, through the above scheme, after the PCF node resumes its Rx interface, it resumes its N7 interface, so that the PCF node can resume receiving and processing the message sent by the SMF node. Meanwhile, for the newly-online UE, the P-CSCF node and the SMF node can provide voice service for the newly-online UE by the first PCF node through interaction with the first PCF node.

Optionally, the P-CSCF node is further configured to, after the N7 interface of the first PCF node returns to normal, if an INVITE request message sent by an online UE is received, send an AAR message to the second PCF node via the DRA node when an NR access information is newly added in a PANI header field of the INVITE request message is identified;

the SMF node is further configured to interact with the N7 interface of the second PCF node based on the access network type of the newly-online UE after the N7 interface of the first PCF node is restored to be normal, so as to trigger an establishment Flow of a voice special quality of service (QoS) Flow for the online UE.

It can be understood that, through the above scheme, after the PCF node resumes its Rx interface, it resumes its N7 interface, so that the PCF node can resume receiving and processing the message sent by the SMF node. Meanwhile, for the online UE, the P-CSCF node and the SMF node can continuously provide voice service for the online UE by the second PCF node through interaction with the second PCF node.

It should be noted that, in other embodiments, for an online UE, the method may also switch back to the first PCF node to continue providing voice service. Specifically, if the first PCF node needs to switch back to continue providing the voice service, the first PCF node may provide the voice service for the newly-online UE by performing the offline processing on the online UE or waiting for the UE to be offline actively and then online, and then the P-CSCF node and the SMF node interact with the first PCF node.

In addition, corresponding to the above-mentioned voice service restoration method shown in fig. 3, the embodiment of the present disclosure further provides a voice service restoration apparatus, which is applicable to a PCF node (for example, the PCF node shown in fig. 2). Fig. 6 is a schematic structural diagram of a voice service recovery apparatus 600 according to an embodiment of the present disclosure, including:

a receiving unit 610, configured to receive, through an Rx interface, an answer authentication request AAR message sent by a proxy call session control function P-CSCF node, where the AAR message is sent when the P-CSCF node parses access network information PANI header field of an INVITE request message initiated by a user equipment UE to newly add new air interface NR access information;

a reply authentication response unit 620, configured to return a reply authentication response AAA message to the P-CSCF node based on the AAR message, where the AAA message carries an access network type of the UE;

a triggering unit 630, configured to interact with a session management function SMF node through an N7 interface based on the access network type of the UE, so as to trigger an establishment Flow of a voice dedicated quality of service QoS Flow;

and an interface locking unit 640, configured to lock the N7 interface when detecting that the Rx interface fails, so as to trigger the SMF node to reselect other PCF nodes.

According to the voice service recovery device provided by the embodiment of the specification, the Rx interface of the PCF node is linked with the N7 interface, and when the Rx interface of the PCF node fails, the N7 interface of the PCF node is actively locked to trigger the SMF node to reselect other PCF nodes, so that the quick recovery of voice service is realized, and the continuity of the voice service is ensured.

Optionally, the apparatus further comprises:

the first control unit is used for controlling the N7 interface to be in a locking state after the interface locking unit locks the N7 interface to trigger the SMF node to reselect the PCF node;

a timeout detection unit, configured to detect whether the Rx interface receives an AAR message sent by the P-CSCF node and is timeout;

and the error response unit is used for returning an error response message containing a first error code to the P-CSCF node if the AAR message sent by the P-CSCF node is received by the Rx interface and overtime, and the error response message is used for indicating the P-CSCF node to reselect other PCF nodes.

Optionally, the apparatus further comprises:

the recovery instruction receiving unit is used for receiving a recovery instruction aiming at the N7 interface through a preset man-machine language (MML) interface when detecting that the Rx interface is recovered to be normal after the interface locking unit locks the N7 interface to trigger the SMF node to reselect the PCF node;

And the interface recovery unit is used for recovering the N7 interface based on the received recovery instruction.

Optionally, the apparatus further comprises:

a link detection unit, configured to detect, when the interface locking unit detects that the Rx interface fails, whether a link between the interface locking unit and a DRA node fails, where the AAR message is sent to the link via the DRA node;

the timing unit is used for starting a preset timer when the link abnormality is detected so as to record the duration of the fault of the link;

and the fault detection unit is used for determining that the Rx interface is faulty if the fault duration exceeds the timing duration of the timer.

Optionally, the apparatus further comprises:

and the timing stopping unit is used for controlling the timer to stop if the link is detected to be recovered to be normal before the timing duration of the timer is reached after the timing unit starts the preset timer.

Obviously, the voice service restoration apparatus according to the embodiment of the present disclosure may be used as an execution subject of the voice service restoration method shown in fig. 3, so that the function of the voice service restoration method implemented in fig. 3 can be implemented. Since the principle is the same, the description is not repeated here.

Fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present specification. Referring to fig. 7, at the hardware level, the electronic device includes a processor, and optionally an internal bus, a network interface, and a memory. The Memory may include a Memory, such as a Random-Access Memory (RAM), and may further include a non-volatile Memory (non-volatile Memory), such as at least 1 disk Memory. Of course, the electronic device may also include hardware required for other services.

The processor, network interface, and memory may be interconnected by an internal bus, which may be an ISA (Industry Standard Architecture ) bus, a PCI (Peripheral Component Interconnect, peripheral component interconnect standard) bus, or EISA (Extended Industry Standard Architecture ) bus, among others. The buses may be classified as address buses, data buses, control buses, etc. For ease of illustration, only one bi-directional arrow is shown in FIG. 7, but not only one bus or type of bus.

And the memory is used for storing programs. In particular, the program may include program code including computer-operating instructions. The memory may include memory and non-volatile storage and provide instructions and data to the processor.

The processor reads the corresponding computer program from the nonvolatile memory to the memory and then runs the computer program to form the voice service recovery device on the logic level. The processor is used for executing the programs stored in the memory and is specifically used for executing the following operations:

The method executed by the voice service restoration apparatus disclosed in the embodiment shown in fig. 3 of the present specification may be applied to a processor or implemented by a processor. The processor may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in a processor or by instructions in the form of software. The processor may be a general-purpose processor, including a central processing unit (Central Processing Unit, CPU), a network processor (Network Processor, NP), etc.; but also digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. The various methods, steps and logic blocks disclosed in the embodiments of this specification may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present specification may be embodied directly in hardware, in a decoded processor, or in a combination of hardware and software modules in a decoded processor. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in a memory, and the processor reads the information in the memory and, in combination with its hardware, performs the steps of the above method.

It should be understood that the electronic device of the embodiment of the present disclosure may implement the functions of the voice service restoration apparatus in the embodiment shown in fig. 3. Since the principles are the same, the embodiments of the present disclosure are not repeated here.

Of course, in addition to the software implementation, the electronic device in this specification does not exclude other implementations, such as a logic device or a combination of software and hardware, that is, the execution subject of the following process is not limited to each logic unit, but may also be hardware or a logic device.

The present description also proposes a computer-readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by a portable electronic device comprising a plurality of application programs, enable the portable electronic device to perform the method of the embodiment shown in fig. 3, and in particular to perform the operations of:

The foregoing describes specific embodiments of the present disclosure. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims can be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

In summary, the foregoing description is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present specification should be included in the protection scope of the present specification.

The system, apparatus, module or unit set forth in the above embodiments may be implemented in particular by a computer chip or entity, or by a product having a certain function. One typical implementation is a computer.

Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.

In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for system embodiments, since they are substantially similar to method embodiments, the description is relatively simple, as relevant to see a section of the description of method embodiments.

Claims

1. A voice service restoration method, applied to a PCF node of a policy control function, the method comprising:

2. The method of claim 1, wherein after latching the N7 interface to trigger the SMF node to reselect to a PCF node, the method further comprises:

controlling the N7 interface to be in a locking state;

detecting whether the Rx interface receives an AAR message sent by the P-CSCF node and overtime;

and if so, returning an error response message containing the first error code to the P-CSCF node, wherein the error response message is used for indicating the P-CSCF node to reselect other PCF nodes.

3. The method of claim 1, wherein after latching the N7 interface to trigger the SMF node to reselect to a PCF node, the method further comprises:

when the Rx interface is detected to be recovered to be normal, receiving a recovery instruction aiming at the N7 interface through a preset man-machine language (MML) interface;

and restoring the N7 interface based on the received restoration instruction.

4. A method according to any one of claims 1 to 3, wherein upon detecting that the Rx interface is malfunctioning, the method further comprises, prior to blocking the N7 interface:

detecting whether a link between the AAR message and a DRA node fails, wherein the AAR message is sent to the link through the DRA node;

when the link abnormality is detected, starting a preset timer to record the duration of the fault of the link;

and if the fault duration exceeds the timing duration of the timer, determining that the Rx interface is faulty.

5. The method of claim 4, wherein after starting the preset timer, the method further comprises:

and if the link is detected to be normal before the timing duration of the timer is reached, controlling the timer to stop.

6. A voice service restoration apparatus, applied to a PCF node of a policy control function, comprising:

the triggering unit is used for interacting with the session management function SMF node through an N7 interface based on the access network type of the UE so as to trigger the establishment Flow of the voice special service quality Flow QoS Flow;

7. A voice service restoration system, comprising: a P-CSCF node, an SMF node and a plurality of PCF nodes;

8. The system of claim 7, wherein the system further comprises a controller configured to control the controller,

the PCF node is also used for recovering an N7 interface when the Rx interface is recovered to be normal;

9. The system of claim 8, wherein the system further comprises a controller configured to control the controller,

the P-CSCF node is further configured to, after the N7 interface of the first PCF node returns to normal, send an AAR message to the second PCF node via the DRA node when it is identified that NR access information is newly added in a PANI header field of the INVITE request message if the INVITE request message sent by the online UE is received;

10. An electronic device, comprising:

a processor;

a memory for storing the processor-executable instructions;

wherein the processor is configured to execute the instructions to implement the method of any one of claims 1 to 5.