CN106464693B

CN106464693B - A kind of P-CSCF load management method and PGW

Info

Publication number: CN106464693B
Application number: CN201580031159.2A
Authority: CN
Inventors: 陈霞云; 倪国瑜; 邓涛; 陈丽金
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2015-06-29
Filing date: 2015-06-29
Publication date: 2019-09-20
Anticipated expiration: 2035-06-29
Also published as: WO2017000142A1; CN106464693A

Abstract

The embodiment of the invention discloses a kind of P-CSCF load management method and PGW, are related to the communications field, realize existing automatic load balancing and the load migration lossless to VoLTE voice service.Scheme provided in an embodiment of the present invention includes: the status message sent by receiving each P-CSCF of PGW management；According to status message, the load on each P-CSCF of PGW management is managed.The present invention is used for P-CSCF load management.

Description

A kind of P-CSCF load management method and PGW

Technical field

The present invention relates to the communications field more particularly to a kind of P-CSCF load management method and packet data network gateways (Packet Data Network GateWay, abbreviation PGW).

Background technique

Network is disposed after voice Long Term Evolution (Voice Over LTE, abbreviation VoLTE), network protocol (Internet Protocol, abbreviation IP) IP multimedia subsystem, IMS (IP Multimedia Subsystem, abbreviation IMS) network by Proxy Call Session Control Function (Proxy-Call Session Control Funtion, abbreviation P-CSCF), query call Conversation control function (Interrogating-Call Session Control Funtion, abbreviation I-CSCF) and service call The equipment such as conversation control function (Serving-Call Session Control Funtion, abbreviation S-CSCF) are constituted.Wherein, The agent node that P-CSCF is accessed as IMS, all IMS business are required to be accessed by P-CSCF.

Under VoLTE deployment, the PGW in evolution block core (Evolved Packet Core, abbreviation EPC) network passes through SGi interface and the P-CSCF of IMS network connection, PGW is because capacity volume variance and P-CSCF opposite joining relation are many-one relationships.It connects Enter the user equipment (User Equipment, abbreviation UE) of P-CSCF, that is, the load of P-CSCF, selection P-CSCF is mainly It is allocated by PGW, UE needs first to establish before carrying out IMS registration the default bearer of transmitting SIP signaling, in IMS PDN It connects in establishment process and requests the address P-CSCF to PGW, PGW carries P-CSCF address list in the response message, and (PGW is according to certainly The weight ratio of the preconfigured each P-CSCF of body feeds back P-CSCF address list, and it is whole to carry out load balancing dispatch user End), UE preferentially selects first address P-CSCF in P-CSCF address list, and initiates session initiation protocol (Session Initiation Protocol, abbreviation SIP) registration, it just can be carried out normal voice calling and called service later.

Wherein, in currently practical deployment, generally according to the performance of each P-CSCF and network deployment planning, in PGW Preconfigured fixed P-CSCF weight carries out in load balancing dispatch user to the P-CSCF of docking, realizes user point with this The load balancing of hair.

But inevitably there are some abnormal scenes in VoLTE operation, need to adjust the negative of P-CSCF equipment room It carries, specifically includes:

On the one hand, it in the way of preconfigured fixed P-CSCF weight distribution load, is led under some abnormal scenes Cause the load between practical P-CSCF unbalanced, such as may no user access, new dilatation on the P-CSCF restored after failure P-CSCF access number of users is considerably less, although PGW can issue the address P-CSCF based on load sharing principle, due to terminal Compatibility, not all terminal all can preferentially select first address P-CSCF of address list etc..In the prior art not There is the method controlled for the load imbalance between P-CSCF, and long-term load imbalance will greatly increase P-CSCF and gather around The risk of plug, and carrier network is made not obtain optimal utilization.

On the other hand, there are needs and the user in P-CSCF equipment is moved to scene on other P-CSCF, such as P- The scenes such as CSCF upgrading, resettlement, congestion.When handling these scenes in the prior art, it will may directly need to upgrade or move P-CSCF it is offline or identification is less than congestion, it is impaired all to will lead to VoLTE voice service in equipment.

Summary of the invention

The present invention provides a kind of P-CSCF load management method and PGW, realizes automatic load balancing and to VoLTE voice The load migration of service nondestructive.

In order to achieve the above objectives, the embodiment of the present invention adopts the following technical scheme that

In a first aspect, providing a kind of P-CSCF load management method, it is applied to PGW, which comprises

Receive the status message that each P-CSCF of the PGW management is sent；

According to the status message, the load on each P-CSCF of PGW management is managed.

With reference to first aspect, in the first possible implementation of the first aspect,

The status message includes the load information for being used to indicate P-CSCF access capability；

The load on each P-CSCF according to the status message, managed the PGW is managed, comprising:

According to the load information, each P-CSCF of Xiang Suoshu PGW management distributes the load of subsequent new access.

With reference to first aspect, in the second possible implementation of the first aspect,

The status message includes the carrying information for being used to indicate P-CSCF and whether overloading；

If in the P-CSCF of the PGW management, there are the first P-CSCF, described according to the status message, to the PGW Load on each P-CSCF of management is managed, comprising:

Load migration is carried out to the first P-CSCF, until the first P-CSCF nonoverload；Wherein, the first P- CSCF is that the carrying information in the P-CSCF of PGW management in status message indicates the P-CSCF that P-CSCF overloads；

P-CSCF according to the status message, in the P-CSCF of Xiang Suoshu PGW management in addition to the first P-CSCF Distribute the load of subsequent new access.

The possible implementation of second with reference to first aspect, in the third possible implementation of first aspect In,

The status message further includes the load information for being used to indicate P-CSCF access capability；

P- in the P-CSCF managed according to the status message, Xiang Suoshu PGW in addition to the first P-CSCF CSCF distributes the load of subsequent new access, comprising:

P-CSCF according to the load information, in the P-CSCF of Xiang Suoshu PGW management in addition to the first P-CSCF Distribute the load of subsequent new access.

The possible implementation of second with reference to first aspect, in the 4th kind of possible implementation of first aspect In,

It is described according to the status message if the first P-CSCF is not present in the P-CSCF of the PGW management, to institute The load stated on each P-CSCF of PGW management is managed, comprising:

With reference to first aspect, in the fifth possible implementation of the first aspect,

The status message includes whether being used to indicate P-CSCF i.e. by the maintenance information of O&M；

If in the P-CSCF of the PGW management, there are the 2nd P-CSCF, described according to the status message, to the PGW Load on each P-CSCF of management is managed, comprising:

Load migration is carried out to the 2nd P-CSCF, until non-loaded access on the 2nd P-CSCF；Wherein, described 2nd P-CSCF is that the maintenance information in the P-CSCF of PGW management in status message indicates P-CSCF i.e. by the P- of O&M CSCF；

P-CSCF according to the status message, in the P-CSCF of Xiang Suoshu PGW management in addition to the 2nd P-CSCF Distribute the load of subsequent new access.

The 5th kind of possible implementation with reference to first aspect, in the 6th kind of possible implementation of first aspect In,

P- in the P-CSCF managed according to the status message, Xiang Suoshu PGW in addition to the 2nd P-CSCF CSCF distributes the load of subsequent new access, comprising:

P- according to the load information, in the P-CSCF of Xiang Suoshu PGW management in addition to the 2nd 1 P-CSCF CSCF distributes the load of subsequent new access.

The 5th kind of possible implementation with reference to first aspect, in the 7th kind of possible implementation of first aspect In,

It is described according to the status message if the 2nd P-CSCF is not present in the P-CSCF of the PGW management, to institute The load stated on each P-CSCF of PGW management is managed, comprising:

The 5th kind of possible implementation with reference to first aspect, in the 8th kind of possible implementation of first aspect In,

The status message further includes the carrying information for being used to indicate P-CSCF and whether overloading；

If in the P-CSCF of the PGW management, there are the 3rd P-CSCF, described according to the status message, to the PGW Load on each P-CSCF of management is managed, comprising:

Load migration is carried out to the 3rd P-CSCF, until the 3rd P-CSCF nonoverload；Wherein, the 3rd P- CSCF is the maintenance information instruction P-CSCF in status message in the P-CSCF of PGW management i.e. by O&M, and state disappears The P-CSCF of carrying information instruction P-CSCF overload in breath；Alternatively, the 3rd P-CSCF is the P-CSCF of PGW management Maintenance information instruction P-CSCF in middle status message is i.e. by O&M, and the carrying information instruction P-CSCF in status message is only The P-CSCF of load；

P-CSCF according to the status message, in the P-CSCF of Xiang Suoshu PGW management in addition to the 3rd P-CSCF Distribute the load of subsequent new access.

The 8th kind of possible implementation with reference to first aspect, in the 9th kind of possible implementation of first aspect In,

P- in the P-CSCF managed according to the status message, Xiang Suoshu PGW in addition to the 3rd P-CSCF CSCF distributes the load of subsequent new access, comprising:

P-CSCF according to the load information, in the P-CSCF of Xiang Suoshu PGW management in addition to the 3rd P-CSCF Distribute the load of subsequent new access.

The 8th kind of possible implementation with reference to first aspect, in the tenth kind of possible implementation of first aspect In,

It is described according to the status message if the 3rd P-CSCF is not present in the P-CSCF of the PGW management, to institute The load stated on each P-CSCF of PGW management is managed, comprising:

4th kind of possible implementation of the possible implementation of with reference to first aspect the first or first aspect or 7th kind of possible implementation of first aspect or the tenth kind of possible implementation of first aspect, the of first aspect In a kind of ten possible implementations,

The load information includes at least one in following information: the accessible load number of the P-CSCF residue is somebody's turn to do P-CSCF capacity occupies ratio；

The load on each P-CSCF according to the load information, managed the PGW is managed, comprising:

Receive the P-CSCF address request that the first load is sent；Wherein, first load is subsequent new access Any load in load；

To the first P-CSCF address list of the first load feedback；Wherein, it is wrapped in the first P-CSCF address list Include the address of the P-CSCF of at least one PGW management, the priority load number accessible according to the residue of each P-CSCF Amount is arranged successively from high to low, is arranged successively alternatively, priority is occupied according to each P-CSCF capacity than from low to high.

The possible implementation of second with reference to first aspect is into the tenth kind of possible implementation of first aspect Any one, in the 12nd kind of possible implementation of first aspect,

For the 4th P-CSCF, the load migration, comprising:

User's context is scanned, the load for accessing the 4th P-CSCF is obtained；Wherein, the user's context includes pipe The corresponding relationship of the load of each P-CSCF and access P-CSCF in linchpin；4th P-CSCF needs to carry out load migration Any one P-CSCF；

According to scheduled rate, the 2nd address P-CSCF is sent respectively to the load of access the 4th P-CSCF in batches List, to indicate that the load of access the 4th P-CSCF is migrated；Wherein, the 2nd P-CSCF address list is not Address comprising the 4th P-CSCF.

The 12nd kind of possible implementation with reference to first aspect, in the 13rd kind of possible realization side of first aspect In formula,

Described according to scheduled rate, the 2nd P- is sent respectively to the load of access the 4th P-CSCF in batches After CSCF address list, the method also includes:

It is if not receiving the message that the second load updates the address P-CSCF after preset duration, then negative to described second It carries and sends IMS PND connection release message, to indicate that second load disconnects current IMS PDN connection；Wherein, the IMS PDN connection release message includes instruction information, is used to indicate second load and re-initiates IMS PDN foundation request at once； Any load in load of second load to be sent the P-CSCF address list；

It receives the IMS PDN that second load is sent and establishes request；

To the 2nd P-CSCF address list described in second load feedback.

13rd kind of possible realization side of the 12nd kind of possible implementation or first aspect with reference to first aspect Formula, in the 14th kind of possible implementation of first aspect,

It is described according to scheduled rate, send the 2nd P-CSCF respectively to the load of the access the 4th P-CSCF in batches Address list, comprising:

According to the scheduled rate, do not converse into the load in access the 4th P-CSCF in batches negative Load sends the 2nd P-CSCF address list respectively.

13rd kind of possible realization side of the 12nd kind of possible implementation or first aspect with reference to first aspect 14th kind of possible implementation of formula or first aspect, in the 15th kind of possible implementation of first aspect,

The priority for the address P-CSCF for including in the 2nd P-CSCF address list, according to the residue of each P-CSCF Accessible load number is arranged successively from high to low, is successively arranged alternatively, occupying according to each P-CSCF capacity than from low to high Column.

The possible implementation of second with reference to first aspect to first aspect the tenth kind of possible implementation, 12nd kind of possible implementation of one side to first aspect any one of the 15th kind of possible implementation, In 16th kind of possible implementation of one side,

After the load migration, the method also includes:

No longer the load newly accessed is distributed to the P-CSCF for carrying out load migration.

With reference to first aspect or the first possible implementation of first aspect to first aspect the 16th kind of possibility Any one of implementation, in the 17th kind of possible implementation of first aspect,

Receive the status message that each Proxy Call Session Control Function P-CSCF of the PGW management is sent, comprising:

The state sent by each Proxy Call Session Control Function P-CSCF of the management of PGW described in SGi interface Message；

Alternatively,

Pass through Policy and Charging Rules Function (Policy and Charging Rules Function, abbreviation PCRF forwarding) receives the status message that each Proxy Call Session Control Function P-CSCF of the PGW management is sent.

Second aspect provides a kind of PGW, comprising:

Receiving unit, for receiving each Proxy Call Session Control Function P-CSCF transmission for receiving the PGW management Status message；

Administrative unit is used for according to the received status message of the receiving unit, to each P- of PGW management Load on CSCF is managed.

In conjunction with second aspect, in the first possible implementation of the second aspect,

The administrative unit is specifically used for:

In conjunction with second aspect, in a second possible implementation of the second aspect,

If the administrative unit is specifically used for there are the first P-CSCF in the P-CSCF of the PGW management:

In conjunction with second of possible implementation of second aspect, in the third possible implementation of second aspect In,

The administrative unit is specifically used for:

In conjunction with second of possible implementation of second aspect, in the 4th kind of possible implementation of second aspect In,

If the first P-CSCF is not present in the P-CSCF of the PGW management, the administrative unit is specifically used for:

In conjunction with second aspect, in a fifth possible implementation of the second aspect,

If the administrative unit is specifically used for there are the 2nd P-CSCF in the P-CSCF of the PGW management:

In conjunction with the 5th kind of possible implementation of second aspect, in the 6th kind of possible implementation of second aspect In,

The administrative unit is specifically used for:

In conjunction with the 5th kind of possible implementation of second aspect, in the 7th kind of possible implementation of second aspect In,

If the 2nd P-CSCF is not present in the P-CSCF of the PGW management, the administrative unit is specifically used for:

In conjunction with the 5th kind of possible implementation of second aspect, in the 8th kind of possible implementation of second aspect In,

If the administrative unit is specifically used for there are the 3rd P-CSCF in the P-CSCF of the PGW management:

In conjunction with the 8th kind of possible implementation of second aspect, in the 9th kind of possible implementation of second aspect In,

The administrative unit is specifically used for:

In conjunction with the 8th kind of possible implementation of second aspect, in the tenth kind of possible implementation of second aspect In,

If the 3rd P-CSCF is not present in the P-CSCF of the PGW management, the administrative unit is specifically used for:

In conjunction with the first possible implementation of second aspect or the 4th kind of possible implementation of second aspect or 7th kind of possible implementation of second aspect or the tenth kind of possible implementation of second aspect, the of second aspect In a kind of ten possible implementations,

The administrative unit carries out pipe according to the load information, to the load on each P-CSCF of PGW management Reason, comprising:

In conjunction with second aspect second of possible implementation into the tenth kind of possible implementation of second aspect Any one, in the 12nd kind of possible implementation of second aspect,

For the 4th P-CSCF, the administrative unit carries out load migration, comprising:

In conjunction with the 12nd kind of possible implementation of second aspect, in the 13rd kind of possible realization side of second aspect In formula,

The administrative unit is also used to:

Described according to scheduled rate, the 2nd P- is sent respectively to the load of access the 4th P-CSCF in batches After CSCF address list, if not receiving the message that the second load updates the address P-CSCF, then to institute after preset duration It states the second load and sends IMS PND connection release message, to indicate that second load disconnects current IMS PDN connection；Wherein, The IMS PDN connection release message includes instruction information, is used to indicate second load and re-initiates IMS PDN at once and build Vertical request；Any load in load of second load to be sent the P-CSCF address list；

It receives the IMS PDN that second load is sent and establishes request；

To the 2nd P-CSCF address list described in second load feedback.

In conjunction with the 12nd kind of possible implementation of second aspect or the 13rd kind of possible realization side of second aspect Formula, in the 14th kind of possible implementation of second aspect,

The administrative unit is specifically used for:

In conjunction with the 12nd kind of possible implementation of second aspect or the 13rd kind of possible realization side of second aspect 14th kind of possible implementation of formula or second aspect, in the 15th kind of possible implementation of second aspect,

In conjunction with second aspect second of possible implementation to second aspect the tenth kind of possible implementation, 12nd kind of possible implementation of two aspects to second aspect any one of the 15th kind of possible implementation, the In 16th kind of possible implementation of two aspects,

The administrative unit further include:

In conjunction with the 16th kind of possibility of the possible implementation of the first of second aspect or second aspect to second aspect Any one of implementation, in the 17th kind of possible implementation of second aspect,

The receiving unit is specifically used for:

Alternatively,

The shape sent by each Proxy Call Session Control Function P-CSCF that the forwarding of PCRF receives the PGW management State message.

The third aspect provides a kind of PGW, comprising:

Receiver receives what each Proxy Call Session Control Function P-CSCF that the PGW is managed was sent for receiving Status message；

Processor is used for according to the received status message of the receiver, to each P-CSCF of PGW management On load be managed.

In conjunction with the third aspect, in the first possible implementation of the third aspect,

The processor is specifically used for:

In conjunction with the third aspect, in the second possible implementation of the third aspect,

If the processor is specifically used for there are the first P-CSCF in the P-CSCF of the PGW management:

In conjunction with second of possible implementation of the third aspect, in the third possible implementation of the third aspect In,

The processor is specifically used for:

In conjunction with second of possible implementation of the third aspect, in the 4th kind of possible implementation of the third aspect In,

If the first P-CSCF is not present in the P-CSCF of the PGW management, the processor is specifically used for:

In conjunction with the third aspect, in the 5th kind of possible implementation of the third aspect,

If the processor is specifically used for there are the 2nd P-CSCF in the P-CSCF of the PGW management:

In conjunction with the 5th kind of possible implementation of the third aspect, in the 6th kind of possible implementation of the third aspect In,

The processor is specifically used for:

In conjunction with the 5th kind of possible implementation of the third aspect, in the 7th kind of possible implementation of the third aspect In,

If the 2nd P-CSCF is not present in the P-CSCF of the PGW management, the processor is specifically used for:

In conjunction with the 5th kind of possible implementation of the third aspect, in the 8th kind of possible implementation of the third aspect In,

If the processor is specifically used for there are the 3rd P-CSCF in the P-CSCF of the PGW management:

In conjunction with the 8th kind of possible implementation of the third aspect, in the 9th kind of possible implementation of the third aspect In,

The processor is specifically used for:

In conjunction with the 8th kind of possible implementation of the third aspect, in the tenth kind of possible implementation of the third aspect In,

If the 3rd P-CSCF is not present in the P-CSCF of the PGW management, the processor is specifically used for:

In conjunction with the first possible implementation of the third aspect or the 4th kind of possible implementation of the third aspect or 7th kind of possible implementation of the third aspect or the tenth kind of possible implementation of the third aspect, the of the third aspect In a kind of ten possible implementations,

The processor is managed the load on each P-CSCF of PGW management according to the load information, Include:

In conjunction with the third aspect second of possible implementation into the tenth kind of possible implementation of the third aspect Any one, in the 12nd kind of possible implementation of the third aspect,

For the 4th P-CSCF, the processor carries out load migration, comprising:

In conjunction with the 12nd kind of possible implementation of the third aspect, in the 13rd kind of possible realization side of the third aspect In formula,

The processor is also used to:

It receives the IMS PDN that second load is sent and establishes request；

To the 2nd P-CSCF address list described in second load feedback.

In conjunction with the 12nd kind of possible implementation of the third aspect or the 13rd kind of possible realization side of the third aspect Formula, in the 14th kind of possible implementation of the third aspect,

The processor is specifically used for:

In conjunction with the 12nd kind of possible implementation of the third aspect or the 13rd kind of possible realization side of the third aspect 14th kind of possible implementation of formula or the third aspect, in the 15th kind of possible implementation of the third aspect,

In conjunction with the third aspect second of possible implementation to the third aspect the tenth kind of possible implementation, 12nd kind of possible implementation of three aspects to the third aspect any one of the 15th kind of possible implementation, the In 16th kind of possible implementation of three aspects,

The processor further include:

In conjunction with the 16th kind of possibility of the possible implementation of the first of the third aspect or the third aspect to the third aspect Any one of implementation, in the 17th kind of possible implementation of the third aspect,

The receiver is specifically used for:

Alternatively,

P-CSCF load management method provided in an embodiment of the present invention and PGW, by each P-CSCF for receiving PGW management The status message of transmission；According to status message, the load on each P-CSCF of PGW management is managed.So, by It is fed back in status message by P-CSCF, the dynamic response current state of each P-CSCF, PGW is according to the status message to every Load on a P-CSCF is managed way to manages such as (including) distributing, migrate, so that the distribution of load preferably meets often One P-CSCF is currently accessed ability, improves the equilibrium degree of load distribution, will also correspondingly reduce each P-CSCF appearance The risk of overload；PGW can also be unloaded by the P-CSCF of overload or i.e. by the load on the P-CSCF of O&M, avoid P- Damage of the overload or O&M of CSCF to the call of the load accessed thereon, improves user experience well.

Detailed description of the invention

In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with It obtains other drawings based on these drawings.

Fig. 1 is a kind of IMS PDN Establishing process figure that the prior art provides；

Fig. 2 is a kind of fault recovery flow chart that the prior art provides；

Fig. 3 is a kind of P-CSCF load management method flow schematic diagram provided in an embodiment of the present invention；

Fig. 4 is another kind P-CSCF load management method flow schematic diagram provided in an embodiment of the present invention；

Fig. 4 A is a kind of method flow schematic diagram of load migration provided in an embodiment of the present invention；

Fig. 5 is another kind P-CSCF load management method flow schematic diagram provided in an embodiment of the present invention；

Fig. 6 is a kind of structure drawing of device of PGW provided in an embodiment of the present invention；

Fig. 7 is the structure drawing of device of another kind PGW provided in an embodiment of the present invention.

Specific embodiment

Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment shall fall within the protection scope of the present invention.

Specifically, before UE initiates IMS registration, can first establish IMS PDN connection under the deployment of VoLTE.UE establishes IMS The process of PDN connection can be as shown in Figure 1:

S101, UE send PDN connection to mobile management entity (Mobility Management Entity, abbreviation MME) (PDN connectivity request) message is requested, the instruction of the request address P-CSCF is carried in message.

S102, MME send creation session request (Create to gateway (Serving GateWay, abbreviation SGW) Session request) message, the instruction of the request address P-CSCF is carried in message.

S103, SGW send Create session request message to PGW, and the request address P-CSCF is carried in message Instruction.

S104, PGW select P-CSCF address list, and pass through creation conversational response according to the principle of load sharing Create session response message issues SGW.

Wherein, the P-CSCF address list of selection includes at least PGW according to preferentially distributing of selecting of load sharing principle The address of P-CSCF.

Specifically, in currently practical deployment, generally according to the performance of each P-CSCF and network deployment planning, in PGW In preconfigured fixed P-CSCF weight, carry out load balancing dispatch user to the P-CSCF of docking on, user is realized with this The load balancing of distribution.

Illustratively, it is assumed that PGW manage 4 P-CSCF (be recorded as respectively P-CSCF1, P-CSCF2, P-CSCF3, P-CSCF4), according to the performance of each P-CSCF and network deployment planning, the preconfigured fixed P-CSCF weight in PGW Are as follows: 25:25:10:40.So, PGW is according to the weighted value of configuration, when carrying out load balancing distribution to user, in sequence successively It proceeds as follows: first distributing 25 loads to P-CSCF1, then distribute 25 loads to P-CSCF2, then distribute to P-CSCF3 10 loads, then 40 loads are distributed to P-CSCF4, repeat later, to guarantee user's percentage on each P-CSCF Substantially close to respective weight ratio (25:25:10:40).

It should be noted that above-mentioned example is merely illustrative load distribution, it is not the specific side to load distribution The restriction of formula.

Optionally, the P-CSCF address list of selection can be the address P-CSCF, with being also possible to multiple P-CSCF Location.

Preferably, when the P-CSCF address list of selection is multiple addresses P-CSCF, the P-CSCF that makes number one Location is the address of high priority, so that UE is preferentially selected.

S105, SGW send Create session response message to MME, carry P-CSCF address column in message Table.

S106, MME send PDN connection to UE and receive connectivity accept message, carry P-CSCF in message Address list.

S107, UE select the address P-CSCF to initiate IMS registration from P-CSCF address list.

Preferably, UE selects the address P-CSCF of highest priority to initiate IMS registration from P-CSCF address list.

S108, UE are after IMS registration success, and the P-CSCF of UE access is to PCRF sending application certification request (Application-Auth-Request, abbreviation AAR) message.

Wherein, the address P-CSCF of UE registration is carried in AAR message.

S109, PCRF send authentication response to PGW and request (Re-Auth-Request, abbreviation RAR) message.

Wherein, the address P-CSCF of UE registration is carried in RAR message.

It follows that by two step of S108 and S109, PGW is known that the address P-CSCF of UE registration, and by UE and P- The corresponding relationship of CSCF is updated in the user's context in PGW.

Further, when UE is after IMS registration success, there is the risk to break down in P-CSCF, as some P-CSCF When failure, PGW also needs to carry out fault recovery to the UE for accessing the P-CSCF；Referring to fig. 2, P-CSCF1 is monitored with PGW For process, UE of the PGW to the access P-CSCF1 process for carrying out fault recovery is described, which may include:

Whether S201, PGW periodically detect P-CSCF1 reachable；

S202, when PGW discovery P-CSCF1 is unreachable, PGW, which is sent by SGW to the UE that is registered on P-CSCF1, to be updated Carrying request (Update bearer request) message；

Wherein, updated P-CSCF address list is carried in Update bearer request Messages Message；It updates P-CSCF address list does not include the P-CSCF1 of failure.

After S202, UE receive updated P-CSCF address list, one is selected from updated P-CSCF address list A address P-CSCF, re-initiates IMS registration.

It should be noted that due to UE compatibility issue, the fault recovery process that part terminal does not support PGW to initiate, i.e., In S202, UE receives updated P-CSCF address list and does not re-initiate IMS registration.

Process after S202 is identical as S108 and S109, is no longer repeated herein.

Embodiment one

The embodiment of the present invention one provides a kind of P-CSCF load management method, is applied to PGW, referring to Fig. 3, the method can To include:

The status message that S301, each P-CSCF for receiving PGW management are sent.

Optionally, the status message can be the conventional interaction message of PGW and P-CSCF, that is, pass through PGW and P-CSCF Conventional interaction message carry the content in the status message.

Certainly, the status message may be specific messages, be exclusively used in sending the content that the status message is included； The present invention for the status message form without specifically limiting.

No matter the receiving time of the status message all may be used it should be noted which kind of form the status message takes To determine according to actual needs, the present invention is to this without specifically limiting.

Illustratively, if status message is the conventional interaction message of PGW and P-CSCF, status message can be with conventional interaction Message is sent, every to send primary conventional interaction message, then the content of carrier state message.

Illustratively, if status message is specific messages, status message can periodically be sent, can also be when default Between put send, the present invention is to this without specifically limiting.

Optionally, for the mode of PGW reception state message, following two ways be can include but is not limited to:

First way:

The status message sent by each P-CSCF in the administration of SGi interface.

Wherein, SGi interface is the direct communication interface of PGW and P-CSCF.

Optionally, in above-mentioned first way, if status message is the conventional interaction message of PGW and P-CSCF, state Message can be probe message, such as Ping message.

It should be noted that if status message is the conventional interaction message of PGW and P-CSCF, the form of status message can be with It sets according to actual needs, the present invention is to this without specifically limiting.

The second way:

The status message that each P-CSCF is sent in administration is received by the forwarding of PCRF.

Wherein, when PGW receives the status message that each P-CSCF is sent in administration by the forwarding of PCRF, PGW is i.e. logical The interacting message for crossing Rx interface and Gx interface receives the status message.

Illustratively, in above-mentioned first way, if status message is the conventional interaction message of PGW and P-CSCF, institute Stating Rx interface message can be AAR message；Gx interface message can be RAR interface message.

For example, P-CSCF can send status message to PCRF by Rx interface message (such as AAR message), PCRF utilizes Gx The status message is forwarded to PGW by interface message (such as RAR).

S302, according to the status message, the load on each P-CSCF of PGW management is managed.

Wherein, being managed to the load on each P-CSCF of PGW management can include but is not limited to: load distribution, Load migration etc..

Specifically, can difference according to actual needs, include different contents in status message, to indicate PGW pairs Load on P-CSCF is managed.

It optionally, can be by including the information for reacting the access capability of P-CSCF in status message, so that PGW root According to the information, the distribution of the load newly accessed, improve load imbalance the phenomenon that.

It optionally, can be by including the information for reacting P-CSCF overload in status message, so that PGW is according to the letter Breath, unloads the load on the P-CSCF of overload, improves due to overloading the phenomenon for causing accessing user's business impaired.

It optionally, can be by including reacting P-CSCF to carry out the information of O&M in status message, so that PGW It according to the information, unloads, improves since P-CSCF i.e. can not by O&M to the load on the P-CSCF of O&M will be carried out The phenomenon that the service of offer causes accessing user's business impaired.

It should be noted that the content for including in status message can be set according to actual needs, the present invention to this not into Row is specific to be limited.The scheme that all PGW are managed the load on the P-CSCF managed according to status message belongs to this The protection scope of invention.

P-CSCF load management method provided in an embodiment of the present invention, each P-CSCF by receiving PGW management are sent Status message；According to status message, the load on each P-CSCF of PGW management is managed.So, due to shape State message is fed back by P-CSCF, and the dynamic response current state of each P-CSCF, PGW is according to the status message to each P- Load on CSCF is managed way to manages such as (including) distributing, migrate, so that the distribution of load preferably meets each P-CSCF is currently accessed ability, improves the equilibrium degree of load distribution, will also correspondingly reduce each P-CSCF and overload Risk；PGW can also be unloaded by the P-CSCF of overload or i.e. by the load on the P-CSCF of O&M, avoid P-CSCF The damage to the call of the load accessed thereon of overload or O&M, improve user experience well.

Embodiment two

Second embodiment of the present invention provides another P-CSCF load management methods, are applied to PGW, referring to fig. 4, the method May include:

The status message that S401, each P-CSCF for receiving PGW management are sent.

Wherein, for the mode of the PGW each P-CSCF for the receiving PGW management status message sent, in embodiment It is described in detail in one, is no longer repeated herein.

Optionally, the status message of a P-CSCF may include at least one in following information: be used to indicate the P- The load information of CSCF access capability is used to indicate carrying information that whether P-CSCF currently overload, is used to indicate the P- Whether CSCF will carry out the maintenance information of O&M.

Specifically, the load information may include at least one in following information: what the P-CSCF residue can access Load number, the P-CSCF capacity occupy ratio.Load information is sent after being obtained by P-CSCF statistics, and the present invention unites for P-CSCF Meter obtains the concrete scheme of load information without limiting.

Wherein, the P-CSCF capacity, which is occupied, can connect than the load number that can have been accessed for the P-CSCF with its maximum Enter the ratio of load number, or the load number and the P-CSCF maximum that the P-CSCF has been accessed can access load number Amount.The present invention occupies the specific representation of ratio without limiting for P-CSCF capacity.

Specifically, transmission when the carrying information judges that itself is overloaded according to the load information of itself by P-CSCF.

Wherein, the P-CSCF judges to be referred to as when the load number itself accessed is greater than or equal to the first predetermined threshold value Judge that itself is overloaded for P-CSCF；Alternatively, the P-CSCF judges central processing unit (the Central Processing of itself Unit, abbreviation CPU) occupancy be greater than or equal to the second predetermined threshold value when referred to as P-CSCF judge itself overload；Described One predetermined threshold value, which can be less than or equal to P-CSCF maximum, can access load number；Second predetermined threshold value can be less than Or it is equal to 100%.

Specifically, the maintenance information is instructed by P-CSCF according to the O&M that inside occurs, judge that itself will be transported It is sent when dimension.

Wherein, the O&M that carries out includes but is not limited to: upgrading, lower electricity etc. cannot continue the operation of service.

It should be noted that character style can be used for the presentation format for the information for including in status message, or Digital form, the present invention is to this without specifically limiting.All interactive both sides know altogether.

Preferably, if a P-CSCF judges itself overload or will carry out O&M, the status message of the P-CSCF In can not include load information.

Preferably, if a P-CSCF judges itself not overload or will not will carry out O&M, the shape of the P-CSCF In state message can only load information, without including carrying information or maintenance information.

It preferably, just include carrying information in status information when a P-CSCF judges itself overload.

It preferably, just include maintenance information in status information when a P-CSCF judges that itself will carry out O&M.

Further, after the status message that PGW each P-CSCF for receiving management is sent, PGW needs basis Status message is managed the load on each P-CSCF of PGW management.

Optionally, different according to the content for including in status message, PGW is according to status message, to the every of PGW management Load on a P-CSCF is managed, any one of execution S402, S403, S406, S409 of the property of can choose.

Specifically, executing S402 if only including load information in the status message that PGW is received.

If include carrying information in the status message that PGW is received, S403 is executed.

If include O&M information in the status message that PGW is received, S406 is executed.

If include O&M information and carrying information in the status message that PGW is received, S409 is executed.

S402, according to load information, each P-CSCF managed to PGW distributes the load of subsequent new access.

Specifically, described according to load information, each P-CSCF managed to PGW distributes the mistake of the load of subsequent new access Journey may include following step A and step B:

Step A, the P-CSCF address request that the first load is sent is received；Wherein, first load is subsequent new Any load in the load of access.

Step B, to the first P-CSCF address list of the first load feedback.

It wherein, include the address for the P-CSCF that at least one described PGW is managed in the first P-CSCF address list, it is excellent First grade is arranged successively from high to low according to the accessible load number of the residue of each P-CSCF, alternatively, priority is according to each P-CSCF capacity occupancy is arranged successively than from low to high.

It should be noted that if only including the address of the P-CSCF of PGW management in the first P-CSCF address list, then Without considering priority arrangement.

Optionally, if in the first P-CSCF address list only including the address of the P-CSCF of PGW management, the first P- The address for the P-CSCF for only including in CSCF address list is remaining accessible load number highest in the P-CSCF of PGW management 's.

Optionally, if in the first P-CSCF address list only including not overloading and not carrying out O&M in the administration P-CSCF address, the address for the P-CSCF for only including in the first P-CSCF address list be not overloading in administration and not into Capacity is occupied than minimum in the P-CSCF of row O&M.

Illustratively, it is assumed that PGW1 manages 5 P-CSCF, is recorded as agency 1, agency 2, agency 3, agency 4, agency respectively 5；

At a time, it (only includes load letter that PGW1, which receives the status message that 3 P-CSCF in administration are respectively sent, Breath) it is respectively as follows:

The status message of agency 1: the accessible load number 100 of residue has accessed load number 200；

The status message of agency 2: the accessible load number 150 of residue has accessed load number 100；

The status message of agency 3: the accessible load number 300 of residue has accessed load number 50；

Therefore, PGW1 can to 3 P-CSCF of management, (agency 1, be acted on behalf of agency 2 according to the load information in status message 3) load of subsequent new access is distributed.

Optionally, according to the load information in status message, to 3 P-CSCF of management, (agency 1, acts on behalf of agency 2 PGW1 3) scheme for distributing the load of subsequent new access can at least have following two scheme:

Scheme 1:

From the load information in above-mentioned status message it is found that acting on behalf of 1, agency 2, acting on behalf of the load number that 3 residue can access Amount is respectively as follows: 100,150,300；

When PGW1 receives the P-CSCF address request that the load newly accessed is sent, PGW1 can be according to load point The principle of load, according to the weight ratio of 100:150:300 (i.e. 2:3:6), successively to agency 1, agency 2, the new access of 3 distribution of agency Load.

Optionally, PGW1 first can distribute 2 loads to agency 1, then distribute 3 loads to agency 2, then divide to agency 3 It loads with 6, repeats later.

Certainly, PGW1 can also be distributed first to agency 2 and be loaded, and can also first be distributed and be loaded to agency 3, the present invention is for this The sequence of the load newly accessed in example to agency 1, agency 2,3 distribution of agency, only need to be according to the weight of 2:3:6 without limiting Ratio is sequentially allocated.

Scheme 2:

From the load information in above-mentioned status message it is found that acting on behalf of 1, agency 2, the capacity of agency 3 occupies ratio and is respectively as follows: 200/ (100+200), 100/ (150+100), 50/ (300+50), that is, be respectively as follows: 66.7%, 40%, 14.3%；

When PGW1 receives the P-CSCF address request that the load newly accessed is sent, PGW1 is according to three P-CSCF Capacity occupy and be sequentially allocated the load newly accessed than sequence from low to high so that the capacity of each P-CSCF is occupied than to the greatest extent It may be close to.

Illustratively, PGW1 preferentially can distribute the load newly accessed to agency 3.

Specifically, distributing and loading to agency 1 according to PGW1, specifically may be implemented in above-mentioned two scheme are as follows:

When PGW1 receives the P-CSCF address request that the load that one is newly accessed is sent, PGW1 then can be to this A load feedback P-CSCF address list newly accessed are as follows: act on behalf of 1 address；Alternatively, PGW1 then can be to this new access Load feedback P-CSCF address list are as follows: act on behalf of 1 address, the address of agency 2, the address for acting on behalf of 3.

S403, judge in the P-CSCF of PGW management with the presence or absence of the first P-CSCF.

Wherein, the first P-CSCF is that the carrying information in the P-CSCF of PGW management in status message indicates P-CSCF The P-CSCF of overload.

Specifically, if executing S404 and S405 there are the first P-CSCF in the P-CSCF of PGW management.

If the first P-CSCF is not present in the P-CSCF of PGW management, S402 is executed.

S404, load migration is carried out to the first P-CSCF, until the first P-CSCF nonoverload.

Specifically, referring to fig. 4 A, it is described to the first P-CSCF carry out load migration method, may include:

S4041, scanning user's context, obtain the load of the first P-CSCF of access.

Wherein, the user's context is to store in PGW, including each P-CSCF in administration and accesses P-CSCF's The corresponding relationship of load.

Illustratively, as shown in table 1, a kind of user's context is illustrated；

Table 1

The mark of P-CSCF in administration	Access the load mark of the P-CSCF
		1	UE1、UE3
2	UE2、UE4、UE8
		3	UE5、UE6
5	UE7
		……	……

It should be noted that table 1 is in exemplary fashion, to illustrate the content for including of user's context, not It is the specific restriction to the form and content of user's context.In practical applications, it can determine on user according to actual needs Form and content hereafter, the present invention is to this without specifically limiting.

Illustratively, it is assumed that it includes carrying information instruction P-CSCF3 mistake that PGW2, which is received in the status message of P-CSCF3, It carries, the user's context as shown in Table 1 inside PGW2 scanning, the load of available access P-CSCF3 is UE5, UE6.

S4042, according to scheduled rate, in batches to access the first P-CSCF load send the 2nd P-CSCF address column respectively Table, to indicate that the load of the first P-CSCF of access is migrated.

Wherein, the 2nd P-CSCF address list does not include the address of the first P-CSCF.

Optionally, the priority for the address P-CSCF for including in the 2nd P-CSCF address list, according to each P-CSCF's The accessible load number of residue is arranged successively from high to low, alternatively, according to each P-CSCF capacity occupy than from low to high according to Secondary arrangement.

Due to not including the first P- into the 2nd P-CSCF address list of the load transmission of the first P-CSCF of access The address of CSCF allows the load for receiving the 2nd P-CSCF address list to reregister with the 2nd P-CSCF address list In include other P-CSCF on, realize the migration of load.

Specifically, scheduled rate indicates the quantity that can send information simultaneously, therefore, according to scheduled rate, in batches to connecing The load for entering the first P-CSCF sends the 2nd P-CSCF address list respectively, refers to every time into the load of the first P-CSCF of access Scheduled rate instruction the 2nd P-CSCF address list of several loads transmission, it is wholesale under remaining to send.

Optionally, scheduled rate is less than or equal to the processing capacity of PGW.Scheduled rate can be set according to actual needs, The present invention is to this without specifically limiting.

Preferably, scheduled rate is equal to the processing capacity of PGW

Illustratively, it is assumed that the processing capacity of PGW is that can interact with 100 P-CSCF each second, then scheduled rate It can be then each second to less than or equal to 100/ second, it can clockwise per second accesses the load of the first P-CSCF less than 100 Send the 2nd P-CSCF address list.

Illustratively, based on the example in above-mentioned steps 1, if the processing capacity of PGW is that each second can be with 100 P-CSCF interaction, then PGW2 then can send the 2nd P-CSCF address list to UE5, UE6 simultaneously.

It should be noted that when sending the 2nd P-CSCF address list in batches according to scheduled rate, if detecting PGW's Expense is excessive, scheduled rate transmission can also be reduced, to improve PGW performance.

Further, for the load of PGW the first P-CSCF of access obtained, it is understood that there may be the load conversed, because This, it is described according to scheduled rate, the 2nd address P-CSCF is sent respectively to the load of access the first P-CSCF in batches List may include:

According to the scheduled rate, the load that do not converse into the load in the first P-CSCF of the access in batches divides The 2nd P-CSCF address list is not sent.

Further, the load conversed in the load of the first P-CSCF, after end of conversation, Xiang Qifa are accessed Send the 2nd P-CSCF address list.

It should be noted that sending P-CSCF address list to load for PGW, can be directly transmitted by SGi interface, It can also be sent by the forwarding of PCRF, the present invention is to this without specifically limiting.

It should also be noted that, P-CSCF address list is sent to load for PGW, it can be using current existing interaction Message carries the P-CSCF address list for needing to send and realizes, can also be realized in the form of proprietary message, the present invention is to this Also without specifically limiting.

Optionally, after above-mentioned S4042, under the method for carrying out load migration to the first P-CSCF can also include S4043 is stated to S4045:

If S4043, after preset duration, the message that the second load updates the address P-CSCF is not received, then to second Load sends IMS PND connection release message, disconnects current IMS PDN connection with the second load of instruction.

Wherein, the IMS PDN connection release message includes instruction information, is used to indicate the second load and re-initiates at once IMS PDN establishes request；Any load in load of second load to be sent the P-CSCF address list.

Optionally, the instruction information can reactivate (Reactivation requested) cause value for needs.

Specifically, the preset duration can be realized using timer, i.e., with sending the 2nd P-CSCF to the second load After the list of location, that is, start timer, when the timer times out, then preset duration terminates.

It should be noted that the specific value of preset duration, can set according to actual needs, the present invention to this without It is specific to limit.Wherein, preset duration setting is longer, and judgment accuracy is better, but system implementation requirements are higher；Preset duration is set Fixed is shorter, and judgment accuracy is slightly lower, and system cost of implementation is lower.

Preferably, preset duration is set as 10 seconds.

After preset duration, if not receiving the message that the second load updates the address P-CSCF, illustrate the second load It migrates unsuccessful, then needs to be implemented step 3 and to step 4 second load is re-registered, to achieve the purpose that migration；It avoided It carries and causes the call of the second load impaired.

Optionally, the message that the second load updates the address P-CSCF can be the AAR message in S109.

S4044, the IMS PDN foundation request that the second load is sent is received.

S4045, to the 2nd P-CSCF address list of the second load feedback.

It should be noted that S4044 and S4045 is identical as S103 and S104, no longer repeated herein.

Further, after carrying out load migration to the first P-CSCF, the load newly accessed will not be to the first P-CSCF points Match.

S405, according to status message, the P-CSCF distribution in the P-CSCF that manages to PGW in addition to the first P-CSCF is subsequent The load newly accessed.

Further, on the basis of the status message includes being used to indicate carrying information that whether P-CSCF overloads, The status message can also include the load information for being used to indicate P-CSCF access capability.

Specifically, the P- in S405, according to status message, into the P-CSCF of PGW management in addition to the first P-CSCF CSCF distributes the load of subsequent new access, comprising:

According to load information, P-CSCF distribution in the P-CSCF that manages to PGW in addition to the first P-CSCF is subsequent newly to be connect The load entered.

It should be noted that according to load information in S405, into the P-CSCF of PGW management in addition to the first P-CSCF P-CSCF distributes the load of subsequent new access, and with S402 according to load information, each P-CSCF distribution managed to PGW is subsequent new The process of the load of access is similar, and only PGW does not include first into the P-CSCF address list of the load feedback newly accessed P-CSCF。

Illustratively, it is assumed that PGW1 administers 5 P-CSCF, is recorded as agency 1, agency 2, agency 3, agency 4, agency respectively 5；

At a time, the status message that PGW1 receives that 5 P-CSCF in administration are respectively sent is respectively as follows:

The status message of agency 3: it has overloaded；

The status message of agency 4: the accessible load number 300 of residue has accessed load number 50；

Therefore, agency 3 has been overloaded, then executes S404 and carry out load migration to it.

PGW1 can be according to the load information in status message, to (agency 1, agency 2, agency 4) subsequent new access of distribution Load；It for the process specifically distributed, is described in detail in S402, is no longer repeated herein.

S406, judge in the P-CSCF of PGW management with the presence or absence of the 2nd P-CSCF.

Wherein, the 2nd P-CSCF is that the maintenance information in the P-CSCF of PGW management in status message refers to Show P-CSCF i.e. by the P-CSCF of O&M.

Specifically, if executing S407 and S408 there are the 2nd P-CSCF in the P-CSCF of PGW management.

If the 2nd P-CSCF is not present in the P-CSCF of PGW management, S402 is executed.

S407, load migration is carried out to the 2nd P-CSCF, until non-loaded access on the 2nd P-CSCF.

It should be noted that carrying out the detailed process of load migration to P-CSCF for PGW, carried out in S404 Detailed description, is no longer repeated herein.

Further, after carrying out load migration to the 2nd P-CSCF, the load newly accessed will not be to the 2nd P-CSCF points Match.

S408, according to status message, the P-CSCF distribution in the P-CSCF that manages to PGW in addition to the 2nd P-CSCF is subsequent The load newly accessed.

It further, include whether being used to indicate P-CSCF i.e. by the basis of the maintenance information of O&M in the status message On, the status message can also include the load information for being used to indicate P-CSCF access capability.

Specifically, the P- in S408, according to status message, into the P-CSCF of PGW management in addition to the 2nd P-CSCF CSCF distributes the load of subsequent new access, comprising:

According to load information, P-CSCF distribution in the P-CSCF that manages to PGW in addition to the 2nd P-CSCF is subsequent newly to be connect The load entered.

It should be noted that according to load information in S408, into the P-CSCF of PGW management in addition to the 2nd P-CSCF P-CSCF distributes the load of subsequent new access, and with S402 according to load information, each P-CSCF distribution managed to PGW is subsequent new The process of the load of access is similar, and only PGW does not include second into the P-CSCF address list of the load feedback newly accessed P-CSCF。

The status message of agency 3: O&M will be carried out；

Therefore, agency 3 will carry out O&M, then execute S407 and carry out load migration to it.

S409, judge in the P-CSCF of PGW management with the presence or absence of the 3rd P-CSCF.

Wherein, the 3rd P-CSCF is that the maintenance information in the P-CSCF of PGW management in status message indicates P- CSCF is not i.e. by O&M, and the P-CSCF of the carrying information instruction P-CSCF overload in status message；Alternatively, the 3rd P- CSCF is that the maintenance information in the P-CSCF of PGW management in status message indicates that P-CSCF is by O&M, and status message In carrying information instruction P-CSCF nonoverload P-CSCF.

Specifically, if executing S410 and S411 there are the 3rd P-CSCF in the P-CSCF of PGW management.

If the 3rd P-CSCF is not present in the P-CSCF of PGW management, S402 is executed.

S410, load migration is carried out to the 3rd P-CSCF.

Specifically, if the 3rd P-CSCF refers to for the maintenance information in status message in the P-CSCF of PGW management Show P-CSCF not i.e. by O&M, and in status message carrying information instruction P-CSCF overload P-CSCF, then to the 3rd P- CSCF carries out load migration until the 3rd P-CSCF nonoverload.

If the 3rd P-CSCF is that the maintenance information in the P-CSCF of PGW management in status message indicates P-CSCF The P-CSCF of carrying information instruction P-CSCF nonoverload i.e. by O&M, and in status message, then bear the 3rd P-CSCF Migration is carried until non-loaded access on the 3rd P-CSCF.

Further, after carrying out load migration to the 3rd P-CSCF, the load newly accessed will not be to the 3rd P-CSCF points Match.

S411, according to status message, the P-CSCF distribution in the P-CSCF that manages to PGW in addition to the 3rd P-CSCF is subsequent The load newly accessed.

It further, include being used to indicate whether P-CSCF by the maintenance information of O&M and is used in the status message On the basis of indicating the carrying information whether P-CSCF overloads, the status message can also include being used to indicate P-CSCF access The load information of ability.

Specifically, the P- in S411, according to status message, into the P-CSCF of PGW management in addition to the 3rd P-CSCF CSCF distributes the load of subsequent new access, comprising:

According to load information, P-CSCF distribution in the P-CSCF that manages to PGW in addition to the 3rd P-CSCF is subsequent newly to be connect The load entered.

It should be noted that according to load information in S411, into the P-CSCF of PGW management in addition to the 3rd P-CSCF P-CSCF distributes the load of subsequent new access, and with S402 according to load information, each P-CSCF distribution managed to PGW is subsequent new The process of the load of access is similar, and only PGW does not include third into the P-CSCF address list of the load feedback newly accessed P-CSCF。

S412, the load no longer newly accessed to the P-CSCF distribution for carrying out load migration.

Further, it due to being provided with preset duration in migration, avoids and is moved as caused by load compatibility issue Failure is moved, the phenomenon that will also avoid the call of load impaired.

Embodiment three

The embodiment of the present invention three provides another P-CSCF load management method, with each list in EPC network and IMS network For the interaction of member, Fig. 3 or method shown in Fig. 4 is described in detail.Wherein, PGW is directly interacted by SGi interface with P-CSCF For process.

Assuming that PGW manages 2 P-CSCF, it is recorded as P-CSCF A, P-CSCF B respectively.

Referring to Fig. 5, the method may include:

S501, PGW receive the state comprising load information of P-CSCF A and P-CSCF B transmission by SGi interface respectively Message.

Illustratively, the load information in status message that the P-CSCF A that PGW is received is sent are as follows: capacity occupies ratio 30%；The load information in status message that the P-CSCF B that PGW is received is sent are as follows: capacity occupies ratio 50%.

S502, PGW receive the P-CSCF address request that UE1 is sent.

Wherein, the UE1 is any one in the load of subsequent new access.

Specifically, the P-CSCF address request that the UE1 is sent, is to forward reception step by step by MME, HSS, SGW 's.

S503, PGW feed back P-CSCF address list to UE1.

Wherein, the address of the address in the P-CSCF address list including P-CSCF A and P-CSCF B, P-CSCF A Address priority be higher than P-CSCF B address.

Specifically, PGW feeds back P-CSCF address list to UE1, it is to forward transmission step by step by SGW, HSS, MME.

After S503, the process of UE1 registered ims is described in detail in example 1, herein no longer into Row repeats.

The status message including carrying information that S504, PGW are sent by SGi interface P-CSCF A.

Wherein, the carrying information instruction P-CSCF A overload in the status message.

S505, PGW scan user's context, obtain the load of access P-CSCF A.

Illustratively, it is assumed that PGW scans user's context, and the load for obtaining access P-CSCF A has 20, successively distinguishes It is recorded as UE2~UE21.

According to scheduled rate, 5 not conversed in the load into the load of access P-CSCF A are negative by S506, PGW It carries and sends updated P-CSCF address list, and timer is respectively started.

Specifically, 5 that PGW according to scheduled rate, does not converse in the load into the load of access P-CSCF A Load sends updated P-CSCF address list, is to forward transmission step by step by SGW, HSS, MME.

Wherein, scheduled rate is to handle 5 each second.

Assuming that UE3, UE6, UE8, UE10, UE12 that PGW does not converse into UE2~UE21 send updated P- CSCF address list.

The updated P-CSCF address list does not wrap the address of P-CSCF A, only includes the address of P-CSCF B.

Assuming that PGW receives UE3, UE6, UE8, UE10 that P-CSCF B is sent with updating P-CSCF before timer expiry The message of location, P-CSCF B send UE3, UE6, UE8, UE10 update the address P-CSCF message in include UE3, UE6, The mark of UE8, UE10 are used to indicate UE3, UE6, UE8, UE10 and have accessed P-CSCF B again, realizes from P-CSCF A is migrated to P-CSCF B.

It should be noted that the message that UE3, UE6, UE8, UE10 that P-CSCF B is sent update the address P-CSCF can be A piece of news, or multiple messages, the present invention is to this without specifically limiting.

Further, if after timer expiry, the UE12 that PGW does not receive P-CSCF B transmission updates the address P-CSCF Message then executes S507.

S507, PGW send IMS PND connection release message to UE12.

Wherein, the IMS PDN connection release message includes reactivation requested cause value.

Specifically, PGW PGW sends IMS PND connection release message to UE12, it is to be forwarded step by step by SGW, HSS, MME It sends.

S508, PGW receive the IMS PDN that UE12 is sent and establish request and feed back updated P-CSCF address column to U12 Table re-registers so that UE12 completes IMS.

S509, PGW receive the status information including load information of P-CSCF A transmission, terminate the load of P-CSCF A Migration.

S510, PGW receive the status message comprising maintenance information of P-CSCF B transmission, start to carry out P-CSCF B Load migration, until non-loaded access on the 2nd P-CSCF.

Specifically, to the P-CSCF B process for carrying out load migration and S505 to S508 to P-CSCF A progress in S510 The process of load migration is identical, is no longer repeated herein.

Further, due to being provided with timer in migration, the migration as caused by load compatibility issue is avoided Failure, the phenomenon that will also avoid the call of load impaired.

Example IV

The embodiment of the present invention four provides a kind of PGW 60, and referring to Fig. 6, the PGW 60 may include:

Receiving unit 601, the status message that each P-CSCF for receiving the management of PGW 60 is sent；

Administrative unit 602 is used for each P- according to the received status message of receiving unit 601, managed PGW 60 Load on CSCF is managed.

Optionally, the status message may include the load information for being used to indicate P-CSCF access capability；

Correspondingly, the administrative unit 602 specifically can be used for:

According to load information, each P-CSCF managed to PGW 60 distributes the load of subsequent new access.

Optionally, the status message may include the carrying information for being used to indicate P-CSCF and whether overloading；

Correspondingly, if the administrative unit 602 can specifically be used there are the first P-CSCF in the P-CSCF that PGW 60 is managed In:

Load migration is carried out to the first P-CSCF, until the first P-CSCF nonoverload；Wherein, the first P-CSCF is The P-CSCF of carrying information instruction P-CSCF overload in the P-CSCF that PGW 60 is managed in status message；

According to status message, after the P-CSCF distribution into the P-CSCF of the management of PGW 60 in addition to the first P-CSCF The continuous load newly accessed.

Further, on the basis of the status message includes being used to indicate carrying information that whether P-CSCF overloads, The status message can also include the load information for being used to indicate P-CSCF access capability；

Correspondingly, removing the first P-CSCF in the P-CSCF that the administrative unit 602 according to status message, is managed to PGW 60 Except P-CSCF distribute the load of subsequent new access, can specifically include:

According to load information, the P-CSCF distribution into the P-CSCF of the management of PGW 60 in addition to the first P-CSCF is subsequent new The load of access.

Correspondingly, the administrative unit 602 is specific if the first P-CSCF is not present in the P-CSCF that PGW 60 is managed It can be used for:

Optionally, the status message may include whether being used to indicate P-CSCF i.e. by the maintenance information of O&M；

Correspondingly, if there are the 2nd P-CSCF in the P-CSCF of PGW management, the administrative unit 602 specifically can be with For:

Load migration is carried out to the 2nd P-CSCF, until non-loaded access on the 2nd P-CSCF；Wherein, the 2nd P-CSCF is Maintenance information instruction P-CSCF in the P-CSCF that PGW 60 is managed in status message is i.e. by the P-CSCF of O&M；

According to the status message, after the P-CSCF distribution into the P-CSCF of the management of PGW 60 in addition to the 2nd P-CSCF The continuous load newly accessed.

It further, include whether being used to indicate P-CSCF i.e. by the basis of the maintenance information of O&M in the status message On, the status message can also include the load information for being used to indicate P-CSCF access capability；

Correspondingly, removing the 2nd P-CSCF in the P-CSCF that the administrative unit 602 according to status message, is managed to PGW 60 Except P-CSCF distribute the load of subsequent new access, can specifically include:

According to load information, the P-CSCF distribution into the P-CSCF of the management of PGW 60 in addition to the 2nd P-CSCF is subsequent new The load of access.

Correspondingly, the administrative unit 602 specifically can be with if the 2nd P-CSCF is not present in the P-CSCF that PGW 60 is managed For:

It further, include whether being used to indicate P-CSCF i.e. by the basis of the maintenance information of O&M in the status message On, the status message can also include being used to indicate the carrying information whether P-CSCF overloads；

Correspondingly, if there are the 3rd P-CSCF in the P-CSCF of PGW management, the administrative unit 602 specifically can be with For:

Load migration is carried out to the 3rd P-CSCF, until the 3rd P-CSCF nonoverload；Wherein, the 3rd P-CSCF is Maintenance information instruction P-CSCF in the P-CSCF that PGW 60 is managed in status message is not i.e. by O&M, and holding in status message The P-CSCF of information carrying breath instruction P-CSCF overload；Alternatively, the 3rd P-CSCF is that state disappears in the P-CSCF of the management of PGW 60 Maintenance information instruction P-CSCF in breath is i.e. by O&M, and the P- of the carrying information instruction P-CSCF nonoverload in status message CSCF；

According to status message, the P-CSCF distribution into the P-CSCF of the management of PGW 60 in addition to the 3rd P-CSCF is subsequent new The load of access.

It further, include being used to indicate whether P-CSCF by the maintenance information of O&M and is used to indicate in status message On the basis of the carrying information whether P-CSCF overloads, the status message can also include being used to indicate P-CSCF access capability Load information；

Correspondingly, the administrative unit 602 specifically can be used for:

According to load information, the P-CSCF distribution into the P-CSCF of the management of PGW 60 in addition to the 3rd P-CSCF is subsequent new The load of access.

Further, status message include be used to indicate P-CSCF whether i.e. by the maintenance information of O&M on the basis of, The status message can also include the load information for being used to indicate P-CSCF access capability；

Correspondingly, the administrative unit 602 specifically can be with if the 3rd P-CSCF is not present in the P-CSCF that PGW 60 is managed For:

According to load information, each P-CSCF managed to PGW distributes the load of subsequent new access.

Optionally, the load information may include at least one in following information: what the P-CSCF residue can access Load number, the P-CSCF capacity occupy ratio；

Correspondingly, the administrative unit 602 is according to the load information, on each P-CSCF of PGW management Load is managed, comprising:

To the first P-CSCF address list of the first load feedback；It wherein, include at least one in the first P-CSCF address list The address of the P-CSCF of a PGW management, priority according to the accessible load number of the residue of each P-CSCF from high to low according to Secondary arrangement is arranged successively alternatively, priority is occupied according to each P-CSCF capacity than from low to high.

Specifically, the administrative unit 602 carries out load migration for the 4th P-CSCF, may include:

Further, the administrative unit 602 can be also used for:

It receives the IMS PDN that second load is sent and establishes request；

To the 2nd P-CSCF address list described in second load feedback.

Preferably, the administrative unit 602 specifically can be used for:

Preferably, the priority for the address P-CSCF for including in the 2nd P-CSCF address list, according to each P- The accessible load number of the residue of CSCF is arranged successively from high to low, alternatively, occupying according to each P-CSCF capacity than from low It is arranged successively to height.

Further, the administrative unit 602 can be also used for:

Optionally, the receiving unit 601 specifically can be used for:

The state that each Proxy Call Session Control Function P-CSCF managed by SGi interface PGW 60 is sent disappears Breath；

Alternatively,

The status message that each P-CSCF that PGW 60 is managed is sent is received by the forwarding of PCRF.

PGW 60 provided in an embodiment of the present invention, the status message that each P-CSCF by receiving PGW management is sent；Root According to status message, the load on each P-CSCF of PGW management is managed.So, since status message is by P- CSCF feedback, the dynamic response current state of each P-CSCF, PGW is according to the status message to negative on each P-CSCF Load is managed way to manages such as (including) distributing, migrate, so that preferably to meet each P-CSCF current for the distribution of load Access capability improves the equilibrium degree of load distribution, will also correspondingly reduce each P-CSCF and the risk overloaded occur；PGW The P-CSCF of overload perhaps can also be unloaded the load on the P-CSCF of O&M the overload for avoiding P-CSCF or Damage of the O&M to the call of the load accessed thereon, improves user experience well.

Embodiment five

The embodiment of the present invention four provides another kind PGW 60, and referring to Fig. 7, the PGW 60 may include:

At least one processor 701；At least one communication bus 702, for realizing the connection and phase intercommunication between device Letter, receiver 703；

Wherein, communication bus 702 can be industry standard architecture (Industry Standard Architecture, referred to as ISA) bus, external equipment interconnection (Peripheral Component, referred to as PCI) bus Or extended industry-standard architecture (Extended Industry Standard Architecture, referred to as EISA) is total Line etc..The bus can be divided into address bus, data/address bus, control bus etc..For convenient for indicating, only with a thick line in Fig. 7 It indicates, it is not intended that an only bus or a type of bus.

Processor 701 may be a central processing unit (Central Processing Unit, referred to as CPU), or It is specific integrated circuit (Application Specific Integrated Circuit, referred to as ASIC), or is matched It is set to the one or more integrated circuits for implementing the embodiment of the present invention.

Wherein, receiver 703, the status message that each P-CSCF for receiving the management of PGW 60 is sent；

Processor 701 is used for according to the received status message of receiver 703, on each P-CSCF of the management of PGW 60 Load be managed.

Correspondingly, the processor 701 specifically can be used for:

Correspondingly, if the processor 701 can specifically be used there are the first P-CSCF in the P-CSCF that PGW 60 is managed In:

Correspondingly, in the P-CSCF that the processor 701 according to status message, is managed to PGW 60 except the first P-CSCF it Outer P-CSCF distributes the load of subsequent new access, can specifically include:

Correspondingly, the processor 701 specifically may be used if the first P-CSCF is not present in the P-CSCF that PGW 60 is managed To be used for:

Correspondingly, if the processor 701 can specifically be used there are the 2nd P-CSCF in the P-CSCF of PGW management In:

Correspondingly, in the P-CSCF that the processor 701 according to status message, is managed to PGW 60 except the 2nd P-CSCF it Outer P-CSCF distributes the load of subsequent new access, can specifically include:

Correspondingly, the processor 701 can specifically be used if the 2nd P-CSCF is not present in the P-CSCF that PGW 60 is managed In:

Correspondingly, if the processor 701 can specifically be used there are the 3rd P-CSCF in the P-CSCF of PGW management In:

Load migration is carried out to the 3rd P-CSCF, until the 3rd P-CSCF nonoverload；Wherein, the 3rd P-CSCF is institute The maintenance information instruction P-CSCF in the P-CSCF of the management of PGW 60 in status message is stated not i.e. by O&M, and in status message Carry the P-CSCF of information instruction P-CSCF overload；Alternatively, the 3rd P-CSCF is shape in the P-CSCF of PGW60 management Maintenance information instruction P-CSCF in state message is i.e. by O&M, and the carrying information in status message indicates P-CSCF nonoverload P-CSCF；

Correspondingly, the processor 701 specifically can be used for:

Correspondingly, the processor 701 can specifically be used if the 3rd P-CSCF is not present in the P-CSCF that PGW 60 is managed In:

Correspondingly, the processor 701 is according to the load information, it is negative on each P-CSCF managed the PGW Load is managed, comprising:

Specifically, the processor 701 carries out load migration for the 4th P-CSCF, may include:

Further, the processor 701 can be also used for:

It receives the IMS PDN that second load is sent and establishes request；

To the 2nd P-CSCF address list described in second load feedback.

Preferably, the processor 701 specifically can be used for:

Further, the processor 701 can be also used for:

Optionally, the receiver 703 specifically can be used for:

Alternatively,

It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description, The specific work process of device and unit, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.

In several embodiments provided herein, it should be understood that disclosed system, device and method can be with It realizes by another way.For example, the apparatus embodiments described above are merely exemplary, for example, the unit It divides, only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple units or components It can be combined or can be integrated into another system, or some features can be ignored or not executed.Another point, it is shown or The mutual coupling, direct-coupling or communication connection discussed can be through some interfaces, the indirect coupling of device or unit It closes or communicates to connect, can be electrical or other forms.

The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme 's.

It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit It is that the independent physics of each unit includes, can also be integrated in one unit with two or more units.Above-mentioned integrated list Member both can take the form of hardware realization, can also realize in the form of hardware adds SFU software functional unit.

The above-mentioned integrated unit being realized in the form of SFU software functional unit can store and computer-readable deposit at one In storage media.Above-mentioned SFU software functional unit is stored in a storage medium, including some instructions are used so that a computer Equipment (can be personal computer, server or the network equipment etc.) executes the portion of each embodiment the method for the present invention Step by step.And storage medium above-mentioned includes: USB flash disk, mobile hard disk, read-only memory (Read-Only Memory, abbreviation ROM), random access memory (Random Access Memory, abbreviation RAM), magnetic or disk etc. are various can store The medium of program code.

Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features； And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and Range.

Claims

1. a kind of P-CSCF load management method, which is characterized in that be applied to packet data network gateway PGW, which comprises

Receive the status message that each Proxy Call Session Control Function P-CSCF of the PGW management is sent；

According to the status message, the load on each P-CSCF of PGW management is managed, in which:

The status message includes when being used to indicate the load information of P-CSCF access capability, according to the status message, and root According to the load information, each P-CSCF of Xiang Suoshu PGW management distributes the load of subsequent new access；

The status message includes when being used to indicate the carrying information whether P-CSCF overloads, if the P-CSCF of PGW management Middle there are the first P-CSCF, according to the status message, load migration are carried out to the first P-CSCF, until the first P- CSCF nonoverload；Wherein, the first P-CSCF is the carrying information instruction in the P-CSCF of PGW management in status message The P-CSCF of P-CSCF overload；According to the status message, Xiang Suoshu PGW management P-CSCF in except the first P-CSCF it Outer P-CSCF distributes the load of subsequent new access；

The status message include be used to indicate P-CSCF whether i.e. by the maintenance information of O&M when, if the PGW management P- There are the 2nd P-CSCF in CSCF, according to the status message, load migration is carried out to the 2nd P-CSCF, until described the Non-loaded access on two P-CSCF；Wherein, the 2nd P-CSCF is the dimension in the P-CSCF of PGW management in status message Information instruction P-CSCF is protected i.e. by the P-CSCF of O&M；According to the status message, institute is removed in the P-CSCF of Xiang Suoshu PGW management State the load that the P-CSCF except the 2nd P-CSCF distributes subsequent new access.

2. the method according to claim 1, wherein the status message include be used to indicate P-CSCF whether mistake The carrying information of load further includes the load information for being used to indicate P-CSCF access capability；

P-CSCF in the P-CSCF managed according to the status message, Xiang Suoshu PGW in addition to the first P-CSCF Distribute the load of subsequent new access, comprising:

P-CSCF distribution according to the load information, in the P-CSCF of Xiang Suoshu PGW management in addition to the first P-CSCF The load of subsequent new access.

3. the method according to claim 1, wherein the status message include be used to indicate P-CSCF whether mistake The carrying information of load further includes the load information for being used to indicate P-CSCF access capability；

It is described according to the status message if the first P-CSCF is not present in the P-CSCF of the PGW management, to described Load on each P-CSCF of PGW management is managed, comprising:

4. the method according to claim 1, wherein the status message includes whether being i.e. used to indicate P-CSCF It further include the load information for being used to indicate P-CSCF access capability by the maintenance information of O&M；

P-CSCF in the P-CSCF managed according to the status message, Xiang Suoshu PGW in addition to the 2nd P-CSCF Distribute the load of subsequent new access, comprising:

P-CSCF distribution according to the load information, in the P-CSCF of Xiang Suoshu PGW management in addition to the 2nd P-CSCF The load of subsequent new access.

5. the method according to claim 1, wherein the status message includes whether being i.e. used to indicate P-CSCF It further include the load information for being used to indicate P-CSCF access capability by the maintenance information of O&M；

It is described according to the status message if the 2nd P-CSCF is not present in the P-CSCF of the PGW management, to described Load on each P-CSCF of PGW management is managed, comprising:

6. the method according to claim 1, wherein the status message includes whether being i.e. used to indicate P-CSCF It further include the carrying information for being used to indicate P-CSCF and whether overloading by the maintenance information of O&M；

If there are the 3rd P-CSCF in the P-CSCF of the PGW management, described according to the status message, the PGW is managed Each P-CSCF on load be managed, comprising:

Load migration is carried out to the 3rd P-CSCF；Wherein, the 3rd P-CSCF is shape in the P-CSCF of PGW management Maintenance information instruction P-CSCF in state message is not i.e. by O&M, and the carrying information in status message indicates P-CSCF overload P-CSCF；Alternatively, the 3rd P-CSCF is the maintenance information instruction P- in the P-CSCF of PGW management in status message CSCF is i.e. by O&M, and the P-CSCF of the carrying information instruction P-CSCF nonoverload in status message；

P-CSCF distribution according to the status message, in the P-CSCF of Xiang Suoshu PGW management in addition to the 3rd P-CSCF The load of subsequent new access.

7. according to the method described in claim 6, it is characterized in that, the status message further includes being used to indicate P-CSCF access The load information of ability；

P-CSCF in the P-CSCF managed according to the status message, Xiang Suoshu PGW in addition to the 3rd P-CSCF Distribute the load of subsequent new access, comprising:

P-CSCF distribution according to the load information, in the P-CSCF of Xiang Suoshu PGW management in addition to the 3rd P-CSCF The load of subsequent new access.

8. according to the method described in claim 6, it is characterized in that, the status message further includes being used to indicate P-CSCF access The load information of ability；

It is described according to the status message if the 3rd P-CSCF is not present in the P-CSCF of the PGW management, to described Load on each P-CSCF of PGW management is managed, comprising:

9. according to claim 1, method described in any one of 3,5,8, which is characterized in that the load information includes following letters At least one of in breath: the accessible load number of the P-CSCF residue, the P-CSCF capacity occupy ratio；

Receive the P-CSCF address request that the first load is sent；Wherein, first load is the load of subsequent new access In any load；

To the first P-CSCF address list of the first load feedback；It wherein, include extremely in the first P-CSCF address list The address of the P-CSCF of a few PGW management, priority according to the accessible load number of the residue of each P-CSCF from It is high to Low to be arranged successively, it is arranged successively alternatively, priority is occupied according to each P-CSCF capacity than from low to high.

10. method according to claim 1 to 8, which is characterized in that for the 4th P-CSCF, the load is moved It moves, comprising:

User's context is scanned, the load for accessing the 4th P-CSCF is obtained；Wherein, the user's context includes in administration Each P-CSCF and access P-CSCF load corresponding relationship；4th P-CSCF needs to carry out load migration Any one P-CSCF；

According to scheduled rate, the 2nd P-CSCF address column is sent respectively to the load of access the 4th P-CSCF in batches Table, to indicate that the load of access the 4th P-CSCF is migrated；Wherein, the 2nd P-CSCF address list does not wrap Address containing the 4th P-CSCF.

11. according to the method described in claim 10, it is characterized in that, described according to scheduled rate, in batches to the access After the load of 4th P-CSCF sends the 2nd P-CSCF address list respectively, the method also includes:

If not receiving the message that the second load updates the address P-CSCF after preset duration, then to the second load hair Multimedia subsystem, IMS Packet Data Network PND connection release message is sent, to indicate that second load disconnects current IMS PDN Connection；Wherein, the IMS PDN connection release message includes instruction information, is used to indicate second load and sends out again at once It plays IMS PDN and establishes request；Any load in load of second load to be sent the P-CSCF address list；

It receives the IMS PDN that second load is sent and establishes request；

To the 2nd P-CSCF address list described in second load feedback.

12. according to the method described in claim 10, it is characterized in that, described according to scheduled rate, in batches to the access institute The load for stating the 4th P-CSCF sends the 2nd P-CSCF address list respectively, comprising:

According to the scheduled rate, the load that do not converse into the load in access the 4th P-CSCF in batches divides The 2nd P-CSCF address list is not sent.

13. according to the method described in claim 10, it is characterized in that, load information includes at least one in following information: The accessible load number of the P-CSCF residue, the P-CSCF capacity occupy ratio；

The priority for the address P-CSCF for including in the 2nd P-CSCF address list can connect according to the residue of each P-CSCF The load number entered is arranged successively from high to low, is arranged successively alternatively, occupying according to each P-CSCF capacity than from low to high.

14. according to the method described in claim 10, it is characterized in that, after the load migration, the method also includes:

15. according to the method described in claim 10, it is characterized in that, receiving each agent call session of the PGW management The status message that control function P-CSCF is sent, comprising:

The status message sent by each Proxy Call Session Control Function P-CSCF of the management of PGW described in SGi interface；

Alternatively,

Each agent call session control of the PGW management is received by the forwarding of Policy and Charging Rules Function PCRF The status message that function P-CSCF is sent.

16. a kind of packet data network gateway PGW characterized by comprising

Receiving unit, for receiving the shape for receiving each Proxy Call Session Control Function P-CSCF of the PGW management and sending State message；

Administrative unit is used for according to the received status message of the receiving unit, to each P-CSCF of PGW management On load be managed, in which:

The status message includes when being used to indicate the load information of P-CSCF access capability, and the administrative unit is specifically used for root According to the load information, each P-CSCF of Xiang Suoshu PGW management distributes the load of subsequent new access；

The status message includes when being used to indicate the carrying information whether P-CSCF overloads, if the P-CSCF of PGW management Middle the administrative unit is specifically used for carrying out load migration to the first P-CSCF there are the first P-CSCF, until described the One P-CSCF nonoverload；Wherein, the first P-CSCF is the carrying information in the P-CSCF of PGW management in status message Indicate the P-CSCF of P-CSCF overload；According to the status message, the first P- is removed in the P-CSCF of Xiang Suoshu PGW management P-CSCF except CSCF distributes the load of subsequent new access；

The status message include be used to indicate P-CSCF whether i.e. by the maintenance information of O&M when, if the PGW management P- There are the 2nd P-CSCF in CSCF, the administrative unit is specifically used for carrying out load migration to the 2nd P-CSCF, until institute State non-loaded access on the 2nd P-CSCF；Wherein, the 2nd P-CSCF is in status message in the P-CSCF of PGW management Maintenance information instruction P-CSCF i.e. by the P-CSCF of O&M；In the P-CSCF managed according to the status message, Xiang Suoshu PGW P-CSCF in addition to the 2nd P-CSCF distributes the load of subsequent new access.

17. PGW according to claim 16, which is characterized in that the status message includes whether being used to indicate P-CSCF The carrying information of overload further includes the load information for being used to indicate P-CSCF access capability；

The administrative unit is specifically used for:

18. PGW according to claim 16, which is characterized in that the status message includes whether being used to indicate P-CSCF The carrying information of overload further includes the load information for being used to indicate P-CSCF access capability；

19. PGW according to claim 16, which is characterized in that the status message includes whether being used to indicate P-CSCF It further include the load information for being used to indicate P-CSCF access capability i.e. by the maintenance information of O&M；

The administrative unit is specifically used for:

20. PGW according to claim 16, which is characterized in that the status message includes whether being used to indicate P-CSCF It further include the load information for being used to indicate P-CSCF access capability i.e. by the maintenance information of O&M；

21. PGW according to claim 16, which is characterized in that the status message includes whether being used to indicate P-CSCF It further include the carrying information for being used to indicate P-CSCF and whether overloading i.e. by the maintenance information of O&M；

Load migration is carried out to the 3rd P-CSCF, until the 3rd P-CSCF nonoverload；Wherein, the 3rd P-CSCF It is the maintenance information instruction P-CSCF in status message in the P-CSCF of PGW management not i.e. by O&M, and in status message Carrying information instruction P-CSCF overload P-CSCF；Alternatively, the 3rd P-CSCF is shape in the P-CSCF of PGW management Maintenance information instruction P-CSCF in state message is i.e. by O&M, and the carrying information in status message indicates P-CSCF nonoverload P-CSCF；

22. PGW according to claim 21, which is characterized in that the status message further includes being used to indicate P-CSCF to connect Enter the load information of ability；

The administrative unit is specifically used for:

23. PGW according to claim 21, which is characterized in that the status message further includes being used to indicate P-CSCF to connect Enter the load information of ability；

24. PGW described in any one of 6,18,20,23 according to claim 1, which is characterized in that under the load information includes State at least one in information: the accessible load number of the P-CSCF residue, the P-CSCF capacity occupy ratio；

The administrative unit is managed the load on each P-CSCF of PGW management, wraps according to the load information It includes:

25. PGW described in any one of 6-23 according to claim 1, which is characterized in that for the 4th P-CSCF, the management Unit carries out load migration, comprising:

26. PGW according to claim 25, which is characterized in that the administrative unit is also used to:

Described according to scheduled rate, in batches with sending the 2nd P-CSCF respectively to the load of access the 4th P-CSCF After the list of location, if not receiving the message that the second load updates the address P-CSCF, then to described second after preset duration Load sends multimedia subsystem, IMS Packet Data Network PND connection release message, to indicate that it is current that second load disconnects IMS PDN connection；Wherein, the IMS PDN connection release message includes instruction information, is used to indicate second load at once It re-initiates IMS PDN and establishes request；Any in load of second load to be sent the P-CSCF address list Load；

It receives the IMS PDN that second load is sent and establishes request；

To the 2nd P-CSCF address list described in second load feedback.

27. PGW according to claim 25, which is characterized in that the administrative unit is specifically used for:

28. PGW according to claim 25, which is characterized in that load information includes at least one in following information: should The accessible load number of P-CSCF residue, the P-CSCF capacity occupy ratio；

29. PGW according to claim 25, which is characterized in that the administrative unit further include:

30. PGW according to claim 25, which is characterized in that the receiving unit is specifically used for:

Alternatively,