CN109995726A - Proxy Call Session Control Function disaster recovery method, device, equipment and medium - Google Patents

Abstract

The embodiment of the present invention discloses a method, device, device and medium for disaster recovery of a proxy call session control function. The method includes: in response to an IMS PDN connection request of a user terminal, determining a P-CSCF address request parameter and a user identity included in the PDN connection request; The user allocates the active P-CSCF and the standby P-CSCF corresponding to the P-CSCF address request parameter; and returns to the user terminal a list of IP addresses encapsulated with the active P-CSCF and the standby P-CSCF PDN connection response message. Therefore, the load balancing of the P-CSCF device is realized by using the user's identity, and the configuration is simple and does not require human intervention.

Description

Disaster recovery method, device, device and medium for proxy call session control function

technical field

The present invention relates to the technical field of P-CSCF disaster recovery, in particular to a P-CSCF disaster recovery method, apparatus, device and medium for a proxy call session control function entity.

Background technique

P-CSCF, the Proxy-Call Session Control Function, is the first entity that the user contacts in the IMS system. The P-CSCF is responsible for verifying the request, forwarding it to the specified target, and processing and Forward the response.

When the P-CSCF fails, the users who have already accessed will be affected, and the users who are in the VoLTE service will be directly interrupted. For the users who are not talking, both the calling and the called will be affected.

In the existing network technology, in the scenario of P-CSCF failure, the basis for implementing the disaster recovery solution for VoLTE voice services is: the P-GW learns the P-CSCF equipment attached to the user equipment (UE) when it registers with the IMS network, and when the When the detection mechanism finds that a certain P-CSCF is faulty, the VOLTE voice service is restored by triggering bearer update for all users registered in this P-CSCF.

The existing P-CSCF disaster recovery has the following problems: 1) In the process of allocating active and standby P-CSCFs to VOLTE users, the P-GW configuration is complex, and human intervention is required during disaster recovery, which cannot be implemented automatically; 2) VOLTE discovery In the process of the user registering with the P-CSCF, it needs to be obtained through the interaction of two pairs of diameter messages, the signaling load is relatively high, and the diameter signaling messages flow through multiple network elements, and the process is complicated.

To sum up, there is still a need for an efficient P-CSCF disaster recovery solution to solve at least one of the above problems.

SUMMARY OF THE INVENTION

The embodiments of the present invention provide a P-CSCF disaster recovery method, device, device and medium for a proxy call session control function entity, and realize the load balancing of the P-CSCF device based on the user identity through the P-GW device and the user registration P-CSCF device. The device information is saved, the configuration is simple, no manual intervention is required, the signaling load is reduced, and the registration process is simplified.

In a first aspect, an embodiment of the present invention provides a P-CSCF disaster recovery method for a proxy call session control function entity, including:

In response to the IMS PDN connection request of the user terminal, determine the P-CSCF address request parameter and the user identity included in the PDN connection request;

allocating a primary P-CSCF and a backup P-CSCF corresponding to the P-CSCF address request parameter to the user based on the user IMSI contained in the user identity; and

A PDN connection response message encapsulated with the address list of the active P-CSCF and the standby P-CSCF is returned to the user terminal.

In a second aspect, an embodiment of the present invention provides a P-CSCF disaster recovery device for a proxy call session control function entity. The device includes:

an identity determination unit, configured to determine the P-CSCF address request parameter and the user identity contained in the PDN connection request in response to the IMS PDN connection request of the user terminal;

A P-CSCF allocation unit, configured to allocate the active P-CSCF and the standby P-CSCF corresponding to the P-CSCF address request parameter to the user based on the user IMSI included in the user identity; and

The IP address issuing unit is configured to return to the user terminal a PDN connection response message encapsulated with the IP address lists of the active P-CSCF and the standby P-CSCF.

In a third aspect, an embodiment of the present invention provides a computing device, including: at least one processor, at least one memory, and computer program instructions stored in the memory. When the computer program instructions are executed by the processor, the implementation is implemented as described in the foregoing embodiments. method of the first aspect.

In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium on which computer program instructions are stored, and when the computer program instructions are executed by a processor, the method of the first aspect in the foregoing embodiments is implemented.

The P-CSCF disaster recovery method, device, device and medium of the proxy call session control function entity provided by the embodiment of the present invention realize the load balancing of the P-CSCF device by using the user's identity identifier, and the configuration is simple and does not require human intervention. Moreover, through the deep packet parsing function of the P-GW device itself, the user's registered IP address can be saved without the need for interaction of the diameter signaling, which solves the drawbacks of the original solution of high diameter signaling load and complex process. When a P-CSCF fault occurs, the automatic isolation of the faulty P-CSCF equipment is realized, and the bearer update of the users registered to the P-CSCF equipment is performed to realize the fast recovery function of the voice service of VOLTE users.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings required in the embodiments of the present invention will be briefly introduced below. For those of ordinary skill in the art, without creative work, the Additional drawings can be obtained from these drawings.

FIG. 1 shows an example of disaster recovery of the existing P-CSCF.

FIG. 2 shows a schematic diagram of a process in the prior art for a P-GW to acquire the P-CSCF device information registered by a UE.

FIG. 3 shows a schematic flowchart of a P-CSCF disaster recovery solution according to an embodiment of the present invention.

FIG. 4 shows a schematic diagram of a P-CSCF selection algorithm according to an embodiment of the present invention.

FIG. 5 shows a schematic flowchart of a method for disaster recovery of a proxy call session control functional entity P-CSCF according to an embodiment of the present invention.

FIG. 6 is a structural block diagram showing a P-CSCF disaster recovery apparatus of a proxy call session control function entity according to an embodiment of the present invention.

FIG. 7 shows a schematic diagram of a hardware structure of a computing device provided by an embodiment of the present invention.

Detailed ways

The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the objects, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present invention, and are not configured to limit the present invention. It will be apparent to those skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is only intended to provide a better understanding of the present invention by illustrating examples of the invention.

It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any relationship between these entities or operations. any such actual relationship or sequence exists. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device that includes a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus. Without further limitation, an element defined by the phrase "comprises" does not preclude the presence of additional identical elements in a process, method, article, or device that includes the element.

In the existing network technology, when the P-CSCF fails, the users who have already accessed the P-CSCF will be affected, and the users who are in the VoLTE service will be directly interrupted. Called are affected.

That is, the user will fail to make calls and need to rely on the terminal to achieve call recovery, while for the user to be called, until the user does not make a call and the IMS periodic registration timer expires, the user's called will always fail, and the user experience is poor. .

In view of the importance and sensitivity of voice services, it is necessary to deploy a disaster recovery solution for VoLTE voice services under P-CSCF failure scenarios in the network. When a P-CSCF device attached to the IMS network is registered, when a P-CSCF failure is found through the network detection mechanism, it then triggers bearer update for all users registered in the failed P-CSCF to restore the VOLTE voice service.

In order to communicate with the IMS network, the terminal must know the IP address of the P-CSCF, and this process is called P-CSCF address discovery (P-CSCF Discovery). Only after the MS/UE obtains the address of the P-CSCF, can the subsequent procedures such as IMS registration be performed. In order to realize the disaster recovery of the VOLTE voice service, the P-GW also needs to know the P-CSCF device attached to the UE.

FIG. 1 shows an example of disaster recovery of the existing P-CSCF. This example mainly includes a P-CSCF discovery process, an IMS registration process and a VOLTE voice service recovery process. details as follows.

As shown in Figure 1:

1. The MS/UE initiates a user activation request, the request message carries the PCO IE, and the PCO IE contains the 000CH (P-CSCF IPv4Address Request) and 0001H (P-CSCF IPv6Address Request) parameters, indicating that the MS/UE needs to access the IMS domain .

2. After receiving the request from the UE, the P-GW sends a CCR-I message to the PCRF to request the user policy.

3. The PCRF encapsulates the user's policy information in the CCA-I message, and sends the CCA-I message to the UGW9811.

4. The P-GW checks that the PCO cell in the request message contains 000CH (P-CSCF IPv4Address Request) and 0001H (P-CSCF IPv6Address Request) parameters, which will be selected from the active P-CSCF group and the standby P-CSCF group. One P-CSCF (for disaster recovery, the two selected P-CSCFs cannot be the same), and encapsulates its address list into an activation response message and replies to the UE. Thus, the terminal can know the IP address of the P-CSCF, and realize the discovery process of the P-CSCF.

5. After the MS/UE obtains the primary and secondary addresses of the P-CSCF through the P-CSCF Discovery process, it prefers the first P-CSCF address (that is, the primary P-CSCF) for IMS registration; if the registration fails, it tries to use the P-CSCF address. The second P-CSCF address (ie, the standby P-CSCF) obtained in the CSCF Discovery process is re-registered. As shown in Figure 1, the registration is implemented based on the SIP Rsgister signaling message.

6. After the P-CSCF accepts the registration of the UE, it notifies the PCRF of the IP information of the device through the AVP information element in the AAR message of the Rx interface (6-a as shown in Figure 1), and the PCRF returns the AAA confirmation to the P-CSCF. message (6-b shown in Figure 1).

7. After the PCRF receives the AAR message of the P-CSCF, it notifies the P-GW of the IP address of the P-CSCF through the AVP cell in the RAR message of the Gx interface (7-a as shown in Figure 1), and the P- After receiving the message, the GW saves the device information of the P-CSCF registered by the user, that is, the IP address, and then replies the RAA message to the PCRF (7-b shown in FIG. 1 ).

8. The P-CSCF replies 200 OK to the UE.

As shown in Figure 1 and the above-mentioned P-CSCF disaster recovery implementation process, in the traditional P-CSCF failure scenario, in order to realize the disaster recovery function of VOLTE voice, there are two methods for the P-GW to allocate and discover the P-CSCF equipment registered by the UE. question:

(1) The process of allocating active and standby P-CSCFs for VOLTE users: The P-GW configuration is complex, and human intervention is required during disaster recovery, which cannot be implemented automatically.

The process of allocating the active P-CSCF and the standby P-CSCF to the user is to configure the active/standby P-CSCF group in the P-GW respectively, and set the order of each P-CSCF in the active/standby P-CSCF group, Then, in the active/standby P-CSCF group, the P-CSCFs are allocated to users by polling respectively, and the device configuration is complicated. And when a P-CSCF fails, the faulty P-CSCF needs to be deleted from the active/standby P-CSCF group through human intervention to achieve the purpose of fault isolation. The operation is cumbersome and the automatic disaster recovery function cannot be realized.

(2) Discover the P-CSCF process of VOLTE user registration: obtained through the interaction of two pairs of diameter messages, which increases the signaling load, and the diameter signaling messages flow through multiple network elements, and the process is complicated.

The P-GW learns that the P-CSCF address registered by the user's IMS APN is obtained through the interaction of two pairs of diameter messages, AAR/AAA and RAR/RAA. With the gradual increase of VOLTE user groups, the signaling load of the diameter signaling network will increase. . Moreover, in the existing mobile network, the diameter signaling interaction between the P-CSCF and PCRF, PCRF and P-GW equipment is all transferred by the DRA, that is, all messages will be converged on the DRA equipment, and the paired The diameter message can only be processed by the same DRA device, which undoubtedly increases the processing load of the signaling message by the DRA device.

FIG. 2 shows a schematic diagram of a process in the prior art for a P-GW to acquire the P-CSCF device information registered by a UE.

As shown in Figure 2: The diameter message required by the P-GW to learn the P-CSCF address registered by the user's IMS APN needs to flow through multiple network elements, that is, the P-CSCF notifies the P-GW through the PCRF, and the P-GW then passes through the PCRF. The device sends the response message back to the P-CSCF device, and the request and response messages flow through 6 network elements.

Taking the existing mobile network as an example, if the PCRF and the P-CSCF, the P-GW and the PCRF are switched through the DRA, the request and response messages flow through as many as 10 network elements. The complexity increases significantly.

Based on the prior art, the P-GW allocates the active and standby P-CSCF equipment, and obtains the P-CSCF equipment used by the VOLTE user for registration through the diameter signaling message, so as to realize many disaster recovery solutions in the P-CSCF failure scenario. Problems and disadvantages.

The present invention provides a method and device for disaster recovery of a proxy call session control function entity P-CSCF. In the EPC network, a new P-GW allocates the active and standby P-CSCFs and learns the device information of the P-CSCFs registered by the IMS APN of the VOLTE user.

In the P-CSCF allocation process, the method mainly uses the VOLTE user's identity to realize the load balancing of each P-CSCF device in the P-CSCF group, the configuration is simple, and the faulty P-CSCF can be automatically isolated without human intervention. In the P-CSCF discovery process, the DPI function (deep packet analysis) of the P-GW device is mainly used. When the user's SIPregister message flows to the P-GW, the P-GW performs in-depth analysis of the data packet without the need for By interacting with the diameter signaling, the information of the P-CSCF device registered by the user can be obtained and stored, which solves the drawbacks of the high diameter signaling load and complex process of the original solution.

FIG. 3 shows a schematic flowchart of a P-CSCF disaster recovery solution according to an embodiment of the present invention.

Referring to FIG. 3 , the P-CSCF disaster recovery solution of the present invention is specifically as follows.

1. The MS/UE initiates a user activation request, the request message carries the PCO IE, and the PCO IE contains the 000CH (P-CSCF IPv4Address Request) and 0001H (P-CSCF IPv6Address Request) parameters, indicating that the MS/UE needs to access the IMS domain .

2. After receiving the request from the UE, the P-GW sends a CCR-I message to the PCRF to request the user policy.

3. The PCRF encapsulates the user's policy information in the CCA-I message, and sends the CCA-I message to the UGW9811.

4. The P-GW checks that the PCO information element in the request message contains 000CH (P-CSCF IPv4Address Request) and 0001H (P-CSCF IPv6Address Request) parameters, according to the number of locally configured P-CSCF devices and the IMPI or T of the VOLTE user. - IMPU identity, select the primary/standby serving P-CSCF for the user and encapsulate the address list into an activation response message and reply to the UE.

It is assumed that the number of P-CSCF devices configured by the P-GW is N (respectively P-CSCF ₁ , P-CSCF ₂ , . . . P-CSCF _N ).

The identity of a VOLTE user is IMPI or T-IMPU, which contains IMSI, and 1000 is used as the IMSI remainder parameter. For user IMSI, its IMSI% 1000 represents the user's IMSI remainder.

(Note: IMPI=IMSI@ims.mnc<MNC>.mcc<MCC>.3gppnetwork.org; T-IMPU=sip:IMSI@ims.mnc<MNC>.mcc<MCC>.3gppnetwork.org)

Then, the selection algorithm of the active and standby serving P-CSCFs is as follows:

For IMSI% 1000 at The VOLTE user, its active P-CSCF is P-CSCF ₁ , and the standby P-CSCF is P-CSCF ₂ ;

For IMSI% 1000 at The VOLTE user, its active P-CSCF is P-CSCF ₂ , and the standby P-CSCF is P-CSCF ₃ ;

For IMSI% 1000 at For VOLTE users, the active P-CSCF is P-CSCF ₂ , the standby P-CSCF is P-CSCF ₃ , and so on;

For IMSI% 1000 at For VOLTE users, the active P-CSCF is P-CSCF _n , and the standby P-CSCF is P-CSCF ₁ .

Example 1: If the number of P-CSCF devices is N=4, then for a VOLTE user whose IMSI% 1000 is in [0, 249], the active P-CSCF is P-CSCF ₁ , and the standby P-CSCF is P-CSCF ₂ ;

For VOLTE users whose IMSI% 1000 is in [250, 499], the active P-CSCF is P-CSCF ₂ , and the backup P-CSCF is P-CSCF ₃ ;

For VOLTE users whose IMSI% 1000 is in [500, 749], the active P-CSCF is P-CSCF3, and the standby P-CSCF is P-CSCF4;

For VOLTE users whose IMSI% 1000 is in [750, 999], the active P-CSCF is P-CSCF ₄ , and the backup P-CSCF is P-CSCF ₁ .

Therefore, the user IMSI is a VOLTE user of XXXXXXXXXXXX011, its main P-CSCF is P-CSCF ₁ , and its backup P-CSCF is P-CSCF ₂ ; IMSI is a VOLTE user of XXXXXXXXXXXX789, and its main P-CSCF is P-CSCF ₄ , and the standby P-CSCF is P-CSCF ₁ .

Example 2: If the number of P-CSCF devices is N=3, then for a VOLTE user whose IMSI% 1000 is in [0, 333], its active P-CSCF is P-CSCF ₁ , and its standby P-CSCF is P-CSCF ₂ ;

For VOLTE users whose IMSI% 1000 is in [334, 666], the active P-CSCF is P-CSCF ₂ , and the standby P-CSCF is P-CSCF ₃ ;

For a VOLTE user whose IMSI% 1000 is in [667, 999], the active P-CSCF is P-CSCF ₃ , and the standby P-CSCF is P-CSCF ₁ . FIG. 4 shows a schematic diagram of a P-CSCF selection algorithm according to an embodiment of the present invention.

5. After the MS/UE obtains the P-CSCF address through the P-CSCF Discovery process, it selects the first P-CSCF (that is, the main P-CSCF) for IMS registration. If the registration is successful, go to step 6; if the registration fails , the VOLTE registration is retried using the standby P-CSCF. When the registration message flows to the P-GW, the P-GW enables the DPI deep packet analysis function for the SIP message, obtains the P-CSCF address registered by the IMS user and saves it.

6. The P-CSCF replies 200 OK to the UE.

When a P-CSCF fault occurs, the P-GW will automatically delete the faulty P-CSCF from the P-CSCF group and register the The user who arrives at the P-CSCF device realizes the fast recovery function of the VOLTE user's voice service by means of bearer update.

Thus, the P-CSCF disaster recovery scheme of the proxy call session control function entity P-CSCF of the present invention is realized through the above method.

Compared with the prior art, the present invention has the following technical advantages:

(1) By realizing the function of automatically assigning the active and standby P-CSCFs, the existing P-GW configuration is complex, and human intervention is required during disaster recovery, and the operation is cumbersome and cannot be realized automatically;

(2) By using the DPI function (deep packet analysis) of the P-GW device itself, it can solve the high signaling load of the diameter network element and the large number of messages flowing through the network elements caused by the P-CSCF device information mutually registered through the diameter message. , the problem of complex process.

Through the above P-CSCF disaster recovery scheme, the present invention proposes a P-CSCF disaster recovery method for a proxy call session control function entity.

FIG. 5 shows a schematic flowchart of a method for disaster recovery of a proxy call session control functional entity P-CSCF according to an embodiment of the present invention.

Referring to FIG. 5, in step S510, in response to the IMS PDN connection request of the user terminal, determine the P-CSCF address request parameter and the user identity included in the PDN connection request.

The PDN connection request may include, for example, PCO cells, and the PCO cells may include, for example, 000CH (P-CSCF IPv4 Address Request) and 0001H (P-CSCF IPv6 Address Request) parameters, ie, P-CSCF address request parameters.

The PDN connection request may also include the user's identity identifier to identify the user's identity. The user identification may be, for example, the user's IMPI identification and/or T-IMPU identification.

In step S520, based on the user IMSI included in the user identity, the user is allocated an active P-CSCF and a standby P-CSCF corresponding to the P-CSCF address request parameter.

For example, the IMSI interval where the user IMS is located may be determined based on the user IMS of the user, and then the active P-CSCF and the standby P-CSCF corresponding to the IMSI interval are allocated to the user.

Specifically, one or more IMSI intervals may be determined based on the P-CSCF address request parameter and the number of P-CSCF devices configured by the P-GW gateway; the IMSI interval in which the user IMSI of the user is located may be determined; The IMSI interval where the user IMSI is located, and the active P-CSCF and the standby P-CSCF corresponding to the IMSI interval are allocated to the user.

Preferably, the number of the IMSI intervals is equal to the number of the P-CSCF devices.

For example, assuming that the number of configured P-CSCF devices is N, set the IMS remainder parameter M, perform a remainder operation on the user's IMSI based on the set IMS remainder parameter, and use IMSI%M to represent the remainder corresponding to the user's IMSI, Based on the IMSI%M, the IMSI interval in which the user's IMSI is located is determined, so as to allocate the corresponding active P-CSCF and standby P-CSCF to the user.

It should be understood that the IMS remainder parameter M of the present invention can be arbitrarily set, or set according to actual requirements, which is not limited in the present invention.

For example, when the IMSI interval where the user IMSI is located is And when 1≤n<N, the primary P-CSCF of the user is P- _CSCFn , and the standby P-CSCF is P-CSCFn ₊₁ ;

When the IMSI interval where the user IMSI is located is , the active P-CSCF of the user is P-CSCF _N , the standby P-CSCF is P-CSCF ₁ ,

Wherein, N is the number of the P-CSCF devices, M is the IMSI remainder parameter, P-CSCF _n is the nth P-CSCF device, P-CSCF _n+1 is the n+1th P-CSCF device, and P - CSCF _N is the Nth P-CSCF device, and P-CSCF ₁ is the first P-CSCF device.

In a preferred embodiment, according to the above algorithm, the active P-CSCF and the standby P-CSCF can be allocated to the user from the active/standby P-CSCF group, respectively.

Therefore, the present invention realizes the load balance of each P-CSCF device in the P-CSCF group by using the user identity.

In step S530, a PDN connection response message encapsulating the IP address lists of the active P-CSCF and the standby P-CSCF is returned to the user terminal.

Therefore, by realizing the function of automatically assigning the active/standby P-CSCF, the disadvantages of complex configuration of the existing PGW, human intervention required for disaster recovery, cumbersome operations, and inability to be automatically realized are solved.

Further, the P-CSCF disaster recovery method of the present invention may further include: in response to the user terminal's IMS registration request based on the active P-CSCF and/or the standby P-CSCF, acquiring the user's SIP registration message; The DPI deep packet analysis function of the P-GW gateway obtains the P-CSCF device information registered by the user contained in the SIP registration message; and stores the P-CSCF device information registered by the user.

Therefore, in the P-CSCF discovery process, the DPI function (deep packet analysis) of the PGW device is mainly used. When the user's SIP register message flows to the PGW, the PGW obtains the user's registration information by in-depth analysis of the data packet. The P-CSCF device information registered by the user can be stored and stored, and the P-CSCF device information registered by the user can be obtained and stored without the interaction of the diameter signaling, which solves the drawbacks of the high diameter signaling load and complex process of the original solution.

Further, in a scenario where a P-CSCF failure occurs, the P-CSCF disaster recovery method of the present invention may further include: in response to the occurrence of a P-CSCF failure, acquiring relevant information of the failed P-CSCF; deleting the P-CSCF group from the P-CSCF group. the faulty P-CSCF; and, based on the stored P-CSCF device information registered by the user, bearer update for the user registered to the faulty P-CSCF. The P-CSCF device information registered by the user is an IP address.

Therefore, when a P-CSCF fault occurs, the PGW learns that the interface is unreachable through the periodic P-CSCF connectivity detection mechanism (ICMP message), realizes automatic isolation of the faulty P-CSCF device, and registers the P-CSCF device to the P-CSCF. The user of the CSCF device performs bearer update to realize the fast recovery function of the voice service of the VOLTE user.

In addition, the proxy call session control function entity P-CSCF disaster recovery method of the present invention can also be implemented by a proxy call session control function entity P-CSCF disaster recovery device.

FIG. 6 is a structural block diagram showing a P-CSCF disaster recovery apparatus of a proxy call session control function entity according to an embodiment of the present invention. The functional modules of the proxy call session control functional entity P-CSCF disaster recovery device (hereinafter referred to as the P-CSCF disaster recovery device) 600 may be implemented by hardware, software or a combination of hardware and software implementing the principles of the present invention. Those skilled in the art can understand that the functional modules described in FIG. 6 can be combined or divided into sub-modules, so as to realize the principle of the above invention. Accordingly, the description herein may support any possible combination, or division, or further definition of the functional modules described herein.

The P-CSCF disaster recovery apparatus 600 shown in FIG. 6 can be used to implement the P-CSCF disaster recovery method shown in FIG. 5 , and the following only describes the P-CSCF disaster recovery apparatus 600 The functional modules that can be provided and the operations that can be performed by each functional module are briefly described. For the details involved, reference may be made to the description above in conjunction with FIG. 5 , which will not be repeated here.

Referring to FIG. 6 , the P-CSCF disaster recovery apparatus 600 of the proxy call session control function entity of the present invention may include an identity identification determining unit 610 , a P-CSCF assigning unit 620 and an IP address issuing unit 630 .

The identity identification determining unit 610 is configured to, in response to the PDN connection request of the user terminal, determine the P-CSCF address request parameter and the user identity contained in the PDN connection request.

The P-CSCF allocation unit 620 is configured to allocate an active P-CSCF and a standby P-CSCF corresponding to the P-CSCF address request parameter to the user based on the user IMSI included in the user identity.

The IP address issuing unit 630 is configured to return a PDN connection response message encapsulated with the address list of the active P-CSCF and the standby P-CSCF to the user terminal.

Preferably, the user identity identifier may be the user's IMPI identifier and/or the T-IMPU identifier.

Preferably, the P-CSCF allocation unit 620 may determine one or more IMSI intervals based on the P-CSCF address request parameter and the number of P-CSCF devices configured by the P-GW gateway; determine the location where the user IMSI of the user is located. IMSI interval; and based on the IMSI interval in which the user's IMSI is located, allocating an active P-CSCF and a backup P-CSCF corresponding to the IMSI interval for the user.

Preferably, the number of the IMSI intervals is equal to the number of the P-CSCF devices.

Preferably, when the IMSI interval where the user IMSI is located is And when 1≤n<N, the active P-CSCF allocated by the P-CSCF allocation unit 620 for the user is P- _CSCFn , and the standby P-CSCF is P-CSCFn ₊₁ ;

When the IMSI interval where the user IMSI is located is , the active P-CSCF allocated by the P-CSCF allocation unit 620 for the user is P-CSCF _N , and the standby P-CSCF is P-CSCF ₁ ;

Wherein, N is the number of the P-CSCF devices, M is the IMSI remainder parameter, P-CSCF _n is the nth P-CSCF device, P-CSCF _n+1 is the n+1th P-CSCF device, and P - CSCF _N is the Nth P-CSCF device, and P-CSCF ₁ is the first P-CSCF device.

Preferably, the P-CSCF disaster recovery apparatus 600 may further include an information acquisition unit, a parsing unit and a storage unit. The information acquisition unit may acquire the SIP registration message of the user in response to the IMS registration request of the user terminal based on the active P-CSCF and/or the standby P-CSCF; the parsing unit may be based on the DPI deep packet parsing of the P-GW gateway The function is to obtain the information of the P-CSCF device registered by the user contained in the SIP registration message. The storage unit may store the P-CSCF device information registered by the user.

Preferably, the P-CSCF disaster recovery apparatus 600 may further include a troubleshooting unit. The troubleshooting unit may, in response to the occurrence of a P-CSCF failure, obtain relevant information of the failed P-CSCF; delete the failed P-CSCF from the P-CSCF group; Carry out bearer update to the user of the faulty P-CSCF.

Preferably, the P-CSCF device information registered by the user is an IP address.

So far, the P-CSCF disaster recovery scheme of the proxy call session control functional entity of the present invention has been described in detail with reference to the method flow chart in FIG. 4 and the device schematic diagram in FIG. 5 .

To sum up, the P-CSCF disaster recovery scheme of the present invention mainly includes:

(1) In the P-CSCF allocation process, the VOLTE user's identity is mainly used to achieve load balancing of each P-CSCF device in the P-CSCF group, the configuration is simple, and the faulty P-CSCF can be automatically isolated without human intervention. .

In the P-CSCF discovery process, the DPI function (deep packet analysis) of the P-GW device is mainly used. When the user's SIP register message flows to the P-GW, the P-GW performs in-depth analysis on the The P-CSCF device information registered by the user is obtained and stored, and the information of the P-CSCF device registered by the user can be obtained and stored without the interaction of diameter signaling, which solves the drawbacks of high diameter signaling load and complicated process of the original solution.

(2) When a P-CSCF failure occurs, the P-GW learns that the interface is unreachable through the periodic P-CSCF connectivity detection mechanism (ICMP message), realizes automatic isolation of the faulty P-CSCF device, and registers the P-CSCF device at the same time. The user of the P-CSCF device performs bearer update to realize the fast recovery function of the voice service of the VOLTE user.

Compared with the prior art, the P-CSCF disaster recovery solution of the present invention has the following advantages:

(1) By realizing the function of automatically assigning the active and standby P-CSCFs, the existing PGW configuration is complicated, and human intervention is required during disaster recovery, the operation is cumbersome, and the drawbacks cannot be realized automatically;

(2) By using the DPI function (deep packet analysis) of the PGW device itself, it can solve the high signaling load of the diameter network element, the flow of messages through many network elements, and the process caused by the P-CSCF device information mutually registered through the diameter message. complicated question.

In addition, the P-CSCF disaster recovery method for the proxy call session control function entity P-CSCF in the embodiment of the present invention described in conjunction with FIG. 5 may be implemented by a computing device. FIG. 7 shows a schematic diagram of a hardware structure of a computing device provided by an embodiment of the present invention.

The computing device may include a processor 701 and a memory 702 storing computer program instructions.

Specifically, the above-mentioned processor 701 may include a central processing unit (CPU), or a specific integrated circuit (Application Specific Integrated Circuit, ASIC), or may be configured as one or more integrated circuits implementing the embodiments of the present invention.

Memory 702 may include mass storage for data or instructions. By way of example and not limitation, memory 702 may include a Hard Disk Drive (HDD), a floppy disk drive, flash memory, optical disk, magneto-optical disk, magnetic tape or Universal Serial Bus (USB) drive or two or more A combination of more than one of the above. Memory 702 may include removable or non-removable (or fixed) media, where appropriate. Memory 702 may be internal or external to the data processing device, where appropriate. In certain embodiments, memory 702 is non-volatile solid state memory. In certain embodiments, memory 702 includes read only memory (ROM). Where appropriate, the ROM may be a mask programmed ROM, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), electrically rewritable ROM (EAROM) or flash memory or A combination of two or more of the above.

The processor 701 reads and executes the computer program instructions stored in the memory 702 to implement any one of the P-CSCF disaster recovery methods in the foregoing embodiments.

In one example, the computing device may also include a communication interface 703 and a bus 710 . Among them, as shown in FIG. 7 , the processor 701 , the memory 702 , and the communication interface 703 are connected through the bus 710 and complete the mutual communication.

The communication interface 703 is mainly used to implement communication between modules, apparatuses, units and/or devices in the embodiments of the present invention.

Bus 710 includes hardware, software, or both, coupling components of the computing device to each other. By way of example and not limitation, the bus may include Accelerated Graphics Port (AGP) or other graphics bus, Enhanced Industry Standard Architecture (EISA) bus, Front Side Bus (FSB), HyperTransport (HT) Interconnect, Industry Standard Architecture (ISA) Bus, Infiniband Interconnect, Low Pin Count (LPC) Bus, Memory Bus, Microchannel Architecture (MCA) Bus, Peripheral Component Interconnect (PCI) Bus, PCI-Express (PCI-X) Bus, Serial Advanced Technology Attachment (SATA) bus, Video Electronics Standards Association Local (VLB) bus or other suitable bus or a combination of two or more of the above. Bus 710 may include one or more buses, where appropriate. Although embodiments of the present invention describe and illustrate a particular bus, the present invention contemplates any suitable bus or interconnect.

In addition, in combination with the P-CSCF disaster recovery method of the proxy call session control function entity in the above embodiment, the embodiment of the present invention may provide a computer-readable storage medium for implementation. Computer program instructions are stored on the computer-readable storage medium; when the computer program instructions are executed by the processor, any one of the P-CSCF disaster recovery methods in the foregoing embodiments is implemented.

It is to be understood that the present invention is not limited to the specific arrangements and processes described above and shown in the figures. For the sake of brevity, detailed descriptions of known methods are omitted here. In the above-described embodiments, several specific steps are described and shown as examples. However, the method process of the present invention is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the sequence of steps after comprehending the spirit of the present invention.

The functional blocks shown in the above-described structural block diagrams may be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it may be, for example, an electronic circuit, an application specific integrated circuit (ASIC), suitable firmware, a plug-in, a function card, or the like. When implemented in software, elements of the invention are programs or code segments used to perform the required tasks. The program or code segments may be stored in a machine-readable medium or transmitted over a transmission medium or communication link by a data signal carried in a carrier wave. A "machine-readable medium" may include any medium that can store or transmit information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio frequency (RF) links, and the like. The code segments may be downloaded via a computer network such as the Internet, an intranet, or the like.

It should also be noted that the exemplary embodiments mentioned in the present invention describe some methods or systems based on a series of steps or devices. However, the present invention is not limited to the order of the above steps, that is, the steps may be performed in the order mentioned in the embodiments, or may be different from the order in the embodiments, or several steps may be performed simultaneously.

The above are only specific implementations of the present invention. Those skilled in the art can clearly understand that, for the convenience and simplicity of the description, the specific working process of the above-described systems, modules and units may refer to the foregoing method embodiments. The corresponding process in , will not be repeated here. It should be understood that the protection scope of the present invention is not limited to this. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should all cover within the protection scope of the present invention.

Claims (11)

1. a kind of proxy call conversation control function entity P-CSCF disaster recovery method, which is characterized in that the described method includes:

In response to the IP multimedia subsystem IMS PDN connection request of user terminal, P- included in PDN connection request is determined CSCF Address requests parameter and User Identity；

Based on user IMSI included in the User Identity, correspond to the address P-CSCF for user distribution The primary P-CSCF and spare P-CSCF of required parameter；And

The primary P-CSCF, which is packaged with, to user terminal return connects sound with the PDN of the IP address list of spare P-CSCF Answer message.

2. the method according to claim 1, wherein the User Identity be user IMPI mark and/ Or T-IMPU mark.

3. the method according to claim 1, wherein described be based on using included in the User Identity Family IMSI corresponds to the primary P-CSCF and spare P-CSCF of the P-CSCF Address requests parameter, packet for user distribution It includes:

Based on the P-CSCF number of devices that the P-CSCF Address requests parameter and P-GW gateway configure, one or more is determined A section IMSI；

Determine the section IMSI where the user IMSI of the user；And

Based on the section IMSI where the user IMSI, for the user distribute primary P-CSCF corresponding with the section IMSI and Spare P-CSCF.

4. according to the method described in claim 3, it is characterized in that,

The quantity in the section IMSI is equal with the P-CSCF number of devices.

5. according to the method described in claim 4, it is characterized in that,

When the section IMSI where the user IMSI isAnd when 1≤n < N, the user Primary P-CSCF be P-CSCF_n, spare P-CSCF is P-CSCF_n+1；

When the section IMSI where the user IMSI isWhen, the primary P-CSCF of the user is P-CSCF_N, spare P-CSCF is P-CSCF₁,

Wherein, N is the P-CSCF number of devices, and M is IMSI remainder parameter, P-CSCF_nFor n-th of P-CSCF equipment, P- CSCF_n+1For (n+1)th P-CSCF equipment, P-CSCF_NFor n-th P-CSCF equipment, P-CSCF₁For the 1st P-CSCF equipment.

6. the method according to claim 1, wherein the method also includes:

It is requested in response to user terminal based on the IMS registration of the primary P-CSCF and/or the spare P-CSCF, obtains user SIP registration message；

DPI depth Packet analyzing function based on P-GW gateway, obtains the P- of user's registration included in the SIP registration message CSCF facility information；And

Store the P-CSCF facility information of the user's registration.

7. according to the method described in claim 6, it is characterized in that, the method also includes:

In response to P-CSCF failure occurs, the relevant information of failure P-CSCF is obtained；

The failure P-CSCF is deleted from P-CSCF group；And

The P-CSCF facility information of user's registration based on storage carries more the user for being registered to the failure P-CSCF Newly.

8. according to the method described in claim 6, it is characterized in that,

The P-CSCF facility information of the user's registration is IP address.

9. a kind of proxy call conversation control function entity P-CSCF disaster tolerance device, which is characterized in that described device includes:

Identity determination unit determines institute in PDN connection request for the IMS PDN connection request in response to user terminal The P-CSCF Address requests parameter and User Identity for including；

P-CSCF allocation unit, for being distributed for the user based on user IMSI included in the User Identity Primary P-CSCF and spare P-CSCF corresponding to the P-CSCF Address requests parameter；And

IP address issuance unit, for returning to the IP for being packaged with the primary P-CSCF and spare P-CSCF to the user terminal The PDN connection response message of address list.

10. a kind of calculating equipment characterized by comprising at least one processor, at least one processor and be stored in institute The computer program instructions in memory are stated, are realized when the computer program instructions are executed by the processor as right is wanted Seek method described in any one of 1-8.

11. a kind of computer readable storage medium, is stored thereon with computer program instructions, which is characterized in that when the calculating Such as method of any of claims 1-8 is realized when machine program instruction is executed by processor.