CN101325799B

CN101325799B - Method for selecting server and equipment for supporting grouping exchange

Info

Publication number: CN101325799B
Application number: CN2007101189699A
Authority: CN
Inventors: 王利杰; 邱雪峰
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2007-06-15
Filing date: 2007-06-15
Publication date: 2012-07-04
Anticipated expiration: 2027-06-15
Also published as: CN101325799A

Abstract

Several embodiments of the invention provide a method for selecting servers and a device supporting grouping switches, the method comprises: obtaining an IP address of GGSN and an available state corresponding to it according to APN information corresponding to the request after receiving a request to activate PDP context by a mobile terminal; obtaining selective IP address of GGSN and parameters corresponding to it according to the IP address of GGSN and available state corresponding to it, and selecting GGSN for establishing a communication. The device comprises: a first component for receiving a request message to activate PDP context transmitted by the mobile terminal, and obtaining corresponding APN; a second component for obtaining the IP address of GGSN and an available state thereof according to APN; a third component for selecting available IP address of GGSN according to available state of the IP address of GGSN; and a fourth component for selecting GGSN to establish a communication according to parameters corresponding to the available IP address of GGSN.

Description

Select the method and the equipment of supporting packet switching of server

Technical field

The present invention relates to a kind of method of selecting server; Particularly a kind of at activation packet data protocol (Packet Data Protocol; Hereinafter to be referred as: PDP) in the context processing procedure; According to access points (Access Point Name, hereinafter to be referred as: APN) Information Selection can be set up the method for the server of bearer path; The invention still further relates to a kind of equipment of supporting packet switching, particularly a kind of being used in the PDP context activating processing procedure, can set up the equipment of bearer path server through the APN Information Selection, belong to communication technical field.

Background technology

GPRS (General Packet Radio Service, hereinafter to be referred as: GPRS) equipment mark, for example: portable terminal (in the 2G system, be called: Mobile Station, be called for short: MS; In the 3G system, be called: User Equipment; Hereinafter to be referred as: sign UE); Except at global system for mobile communications (Global System for Mobile communication; Hereinafter to be referred as: custom IC (the International Mobile SubscriberIdentification Number that uses GSM); Hereinafter to be referred as IMSI), outside the MSISDN numbers such as (discerning the about number of mirror of mobile phone in the public switched telephone network numbering plan uniquely), (Internet Protocol is hereinafter to be referred as IP) address to also have the Internet protocol that distributes.GPRS serving GPRS support node (ServingGPRS SupportNode; Hereinafter to be referred as: SGSN), GGSN (Gateway GPRSSupport Node; Hereinafter to be referred as: GGSN) wait the sign of network element device, existing signalling system No.7 address has the IP address of data GGSN again; The IP address is adopted in communication between SGSN and the GGSN; And SGSN, GGSN and mobile switching centre (Mobile Switching Center, hereinafter to be referred as: MSC), attaching position register (Home Location Register, hereinafter to be referred as: HLR) wait the communication of adopting the signalling system No.7 address between the entity.

In gprs system; Two important database record informations are arranged: the one, the user mobility managing context; Be used to manage mobile subscriber's positional information; Another is user's a PDP Context, and (Internet ServiceProvider is hereinafter to be referred as ISP) the data routing iinformation between the equipment from portable terminal to gateway GGSN and to ISP to be used for management.

Referring to Fig. 1, Fig. 2; In GSM; When the user will use Packet Service (PacketService; Hereinafter to be referred as: in the time of PS), at first want PDP context activating and set up a bearer path, can use PS professional then through network element such as wireless system, SGSN, GGSN and data network.Third generation partner program (3GPP) is numbered in the technical specification of TS-23.060, has carried out detailed description for the process of PDP context activating; Wherein, when PDP context activating, comprise following step at least:

Portable terminal logical (MS/UE) is crossed the request (Activate PDP Context Request) of wireless network 1 to SGSN transmission PDP context activating, and SGSN selects GGSN according to APN information, and obtains the IP address of GGSN; SGSN sends the request (Create PDP Context Request) of setting up PDP Context to the pairing GGSN in this IP address; After the pairing GGSN in this IP address receives this request of setting up PDP Context, return a response (Create PDPContext Response) of setting up PDP Context to SGSN; After SGSN receives this request of setting up PDP Context, send the message (Activate PDP Context Accept) of accepting PDP context activating to portable terminal; At this moment, the process of PDP context activating is accomplished, and aforementioned required bearer path is set up.

In above-mentioned PDP context activating process; APN can carry in the PDP context activating request that portable terminal sends; Also can in the APN of default configuration, select, wherein, so-called default configuration; Can, the user be pre-configured among HLR or the SGSN when signing relevant telecommunications service contract with corresponding operator by operator.Select the process of GGSN to accomplish at SGSN, therefore, in the PDP context activating process, SGSN will choose a GGSN, needs to accomplish following work: at first, parse the IP address of GGSN through APN; The second, parse at APN under the situation of a plurality of IP address, then to select an IP address according to certain rule.

In fact, APN possibly be or corresponding domain name, obtain the IP address of GGSN, need carry out domain name mapping; After having obtained the IP address, SGSN and GGSN just can communicate and accomplish the process that activates PDP.Existing domain name generally through name server (Domain Name Server, hereinafter to be referred as: DNS) resolve; Disposed an IP address list corresponding to APN in the dns server, this IP address list generally comprises an IP address, and SGSN can directly obtain the IP address of GGSN through dns server.Have under some situation, aforesaid this IP address list also includes a plurality of IP address, and in this case, SGSN can select IP address wherein in turn, also can preferentially use certain IP address wherein.

But; IP address list in the dns server has only comprised the IP address; Clearly do not put down in writing the attribute information of the corresponding GGSN equipment in this IP address; When IP address list comprised a plurality of IP address, these IP addresses possibly be a plurality of interface IP addresses of same GGSN equipment, also possibly be the interface IP addresses of different GGSN equipment.In this case, if GGSN equipment will carry out complicated networking configuration, just can't realize through this mode of inquiry dns server.For example: when comprising two IP addresses in the IP address list that dns server provides, the GGSN equipment that has two to be in main and backup status respectively possibly represented in these two IP addresses; Possibly represent that also a GGSN equipment has two interface IP addresses.If SGSN adopts the mode of polling to use the IP address, the situation of then aforementioned main and backup status GGSN equipment just can't adapt to; If SGSN adopts the preferential mode of selecting to use one of them IP address; The situation that a then aforementioned GGSN equipment has two interface IP addresses also can't adapt to; Because this can cause one of them interface IP address always to be in busy state, and another interface IP address always is in idle state.In a word, because the IP address list in the dns server can't embody the attribute of actual GGSN equipment, which type of selection rule SGSN uses to satisfy the demand of actual networking.

Summary of the invention

One aspect of the present invention provides a kind of method of selecting server; Separate out the IP address according to parametric solutions such as priority; Make SGSN to select the GGSN equipment that is used to communicate by letter neatly according to the attribute information of IP address; Satisfying in the practical application demand of a plurality of GGSN networkings of using different capabilities, and, preferentially select corresponding GGSN equipment to different APN.

Another aspect of the present invention provides the equipment of supporting packet switching; This equipment can be separated out the IP address according to parametric solutions such as priority; Make SGSN to select the GGSN equipment that is used to communicate by letter flexibly according to the attribute information of IP address; Satisfying in the practical application demand of a plurality of GGSN networkings of using different capabilities, and, preferentially select corresponding GGSN equipment to different APN.

In order to realize first aspect of the present invention, the technical scheme of some embodiments of the invention is following: after receiving the request of mobile terminal activating PDP Context, according to asking corresponding APN information with this, obtain one or more GGSN IP addresses; Obtain the upstate of the corresponding GGSN in GGSN IP address; Upstate according to the corresponding GGSN in GGSN IP address obtains optional GGSN IP address; According to optional GGSN IP address and corresponding parameters thereof, to select to be used to set up the GGSN of communication, described parameter comprises priority parameters and weight parameter.

The execution mode of first aspect of the present invention; When resolving the IP address of GGSN according to APN; In conjunction with the upstate of IP address, and can select GGSN equipment neatly, therefore satisfy the demand of using a plurality of GGSN networkings of different capabilities in the practical application according to the attribute information of IP address; And realized different APN is preferentially selected the purpose of corresponding GGSN equipment.

In order to realize second aspect of the present invention; The technical scheme of other embodiment of the present invention is following: a kind of equipment of supporting packet switching is provided; Be used for mobile management or session management; This equipment comprises: be used for the PDP context activating request message that mobile terminal receive sends, and obtain first parts of corresponding APN information; Be used for second parts according to APN information acquisition and one or more GGSN IP addresses and upstate thereof; Be used for selecting the 3rd parts of available GGSN IP address according to the upstate of GGSN IP address; And be used for according to the said available pairing parameter in GGSN IP address; Selection is used to set up GGSN the 4th parts of communication, and described parameter comprises priority parameters and weight parameter.

The execution mode of second aspect of the present invention; Make that this equipment can be when resolving the IP address of GGSN according to APN; In conjunction with the upstate of IP address, and select GGSN equipment neatly, therefore satisfied the demand of using a plurality of GGSN networkings of different capabilities in the practical application according to the attribute information of IP address; And realized different APN is preferentially selected the purpose of corresponding GGSN equipment.

Through concrete execution mode, content of the present invention is done further detailed description below.

Description of drawings

Fig. 1 sets up the sketch map of bearer path for the present invention;

Fig. 2 is the signaling process sketch map of prior art PDP context activating process;

Fig. 3 is the schematic flow sheet of first aspect present invention embodiment;

Fig. 4 is the structural representation of second aspect present invention embodiment;

Fig. 5 is the structure of another embodiment of second aspect present invention.

Embodiment

Referring to Fig. 1,2,3, wherein, Fig. 3 is the flow chart of a specific embodiment of first aspect of realization the present invention, and this embodiment has comprised following step at least:

After receiving the request of mobile terminal activating PDP Context, SGSN just can basis with this request in corresponding APN information, obtain one or more GGSN IP addresses; Generally speaking, an APN can be a real APN, also can be the domain name corresponding with this APN, or can be through a definite sign of APN.

Obtain the upstate of the corresponding GGSN in said GGSN IP address;

Upstate according to the corresponding GGSN in said GGSN IP address obtains optional GGSN IP address; Here need to prove: although can obtain GGSN IP address according to APN; But certain interface of corresponding that GGSN server that connects in this address or GGSN server is owing to a variety of causes, for example: fault etc.; And be in disabled state; Therefore, if the GGSN of GGSN IP address choice that obtains according to APN might choose a disabled GGSN.For this reason; A better scheme is: need and will judge according to the GGSN IP address state available with it; This GGSN IP address whether corresponding an available GGSN server, if can this GGSN IP address be handled as an optional address; Otherwise this GGSN IP address is exactly disabled.Therefore, through aforesaid step, can guarantee that GGSN IP address all is " available ".

Need to prove: to those skilled in the art, aforementioned resolve the step of GGSN IP address and obtain according to APN do not have strict sequencing between the step of the corresponding GGSN upstate in GGSN IP address; In other words: as long as can access the GGSNIP address that can be used for selecting being in the GGSN of upstate; Both can obtain GGSN IP address according to APN earlier; After obtaining the corresponding GGSN upstate in GGSN IP address, only incite somebody to action at last then corresponding to separating the GGSN IP address of upstate; Also can obtain the corresponding GGSN upstate in GGSN IP address earlier, when obtaining GGSN IP address, only will select then corresponding to the GGSN IP address of upstate; Step that obtains GGSN IP address and the step that obtains the corresponding GGSN upstate in GGSN IP address are carried out simultaneously.

After the above-mentioned processing of process, what obtain is the set of an optional GGSN IP address, on this basis, can select the GGSN that is used to set up communication according to these optional GGSN IP addresses and each optional GGSN IP address corresponding priorities parameter.

In addition, the operation of one or more GGSN IP addresses of aforementioned acquisition can have number of ways; For example: store the corresponding IP address table in an APN and GGSN IP address in advance, preserve and corresponding one or more GGSN IP address of APN in this allocation list.After obtaining APN,, obtain corresponding GGSN IP address according to this this IP address table of APN inquiry.Again for example: after obtaining APN, also can send a request of obtaining with the corresponding GGSN IP of this APN address to dns server, this dns server returns an IP address list according to this request, comprising one or more GGSN IP address.

For the technical staff, select the higher relatively pairing GGSN in GGSN IP address of priority parameters to realize easily for this example.What this need further specify be: as previously mentioned,, also can be the domain name corresponding with this APN because an APN can be a real APN, or can be through a definite sign of APN; So; Might parse some GGSN IP address according to the APN that receives; Even, might still can obtain a GGSN IP address set that constitutes by a plurality of GGSN IP address through foregoing according to the disabled GGSN IP of upstate filtering address.But for SGSN, its task is in this GGSN IP address set, to pick out a suitable GGSN, and therefore also should carry out following operation could select a suitable GGSN who can be used for communicating by letter veritably.That is: when having only a GGSN IP address in the optional GGSN IP address set, can only select the corresponding GGSN in this optional GGSN IP address as being used to set up the GGSN of communication; And when having an above GGSN IP address in the optional GGSN IP address set, just need further to select priority parameters to be expressed as the corresponding GGSN in the highest optional GGSN IP address as the aforementioned GGSN that is used to set up communication.

Below be an instance that utilizes technique scheme to select GGSN: suppose to have two GGSN, GGSN1 and GGSN2, wherein GGSN1 has an interface IP address GGSN IP1; GGSN2 also has an interface IP address GGSN IP2; Two APN, that is: AP1 and APN2.Referring to table 1; For APN1; After receiving the PDP Context request that contains APN1 at SGSN, SGSN can parse two IP addresses, that is: GGSN IP1 and GGSN IP2; Suppose that this GGSN1 this moment, GGSN2 are in available state, then SGSN need select one in two IP addresses.According to prior art, this selection is random, therefore can have aforesaid be not suitable for main and backup status GGSN equipment or two situation that the interface IP address load is uneven.The aforesaid embodiment of the present invention can further choose suitable IP address according to certain rule at this moment.That is, the aforesaid embodiment of the present invention can be according to being pre-configured in the pairing GGSN1 of GGSN IP1 that GGSN IP1 and GGSN IP2 are corresponding among the SGSN priority argument selects wherein that level of priority is set at " height ".

Equally referring to table 1, have only when the GGSN1 failover and when unavailable, SGSN just can select GGSN2; As far as APN2, SGSN preferentially selects GGSN2, under the situation of GGSN2 fault, selects GGSN1.In SGSN equipment, can be configured according to configuration parameter shown in the table 1 and corresponding relation thereof.

Table 1

In the foregoing embodiments; Only with regard to the configuration shown in the table 1, the situation that possibly occur except the front narrated, also have following situation: GGSN IP1 and GGSN IP2 are unavailable; At this moment; SGSN resolves the GGSN IP address set that obtains and is actually one " empty set ", and in this case, SGSN will return the information of one " not having corresponding IP address " to the portable terminal that sends PDP context activating request.

Other embodiment of the present invention also need handle following situation; Different with previous embodiment is: if there is situation as shown in table 2, that is: for APN1, receive the PDP Context request that contains APN1 at SGSN after; SGSN can parse two IP addresses; That is: GGSN IP1 and GGSN IP2 suppose that this GGSN1 this moment, GGSN2 are in available state, and then SGSN need select one in two IP addresses.According to aforesaid embodiment, can be according to being pre-configured in the pairing GGSN1 of GGSNIP1 that GGSN IP1 and the priority argument of GGSN IP2 correspondence among the SGSN select wherein that level of priority is set at " height ".But in the present embodiment, GGSN IP1 and GGSN IP2 corresponding priorities parameter all are expressed as " height ", then need that further GGSN IP1 selects corresponding GGSN with the IP address weight parameter of GGSN IP2 correspondence among the SGSN according to being pre-configured in this moment.Obviously, according to the configuration of table 2, the weight parameter that GGSN IP1 is corresponding is higher than the corresponding weight parameter of GGSN IP2, and therefore, SGSN communicates by letter for being used for setting up according to this selection of configuration GGSN1.

Table 2

Referring to table 3, hypothesis has two GGSN again, GGSN1 and GGSN2, they have an interface IP address separately, are respectively GGSN IP1 and GGSN IP2); An APN---APN1.If APN1 hereto, the probability of configuration requirement 70% is selected GGSN1 in SGSN, and 30% probability is selected GGSN2.Then in SGSN equipment, can realize through allocation list as shown in table 3:

Table 3

When carrying out the step of previous embodiment; If GGSN1, but GGSN2 time spent can obtain GGSN IP1 and two addresses of GGSN IP2 for the parsing of APN1; When selecting GGSN; SGSN resolves the GGSNIP address set that obtains and has comprised the probability of aforementioned two addresses difference corresponding 70% and 30% probability, therefore, can select the ratio of GGSN1 and GGSN2 according to this probability assignments.

Hypothesis has three GGSN again, and GGSN1, GGSN2 and GGSN3 correspond respectively to interface IP address GGSNIP1, GGSN IP2 and GGSN IP3; An APN---APN1.As far as this APN, preferentially select GGSN1, under the situation of GGSN1 fault, select GGSN2 and GGSN3 in turn.Configuration such as the table 4 in SGSN equipment then.

Table 4

When carrying out the step of previous embodiment; If GGSN1 is unavailable, but and GGSN2, GGSN3 time spent all can obtain GGSN IP2 and two addresses of GGSN IP3 for the parsing of APN1; When selecting GGSN; SGSN resolves the GGSN IP address set that obtains and has comprised aforementioned two addresses probability of all configuration correspondences 50% respectively, therefore, can select the ratio of GGSN2 and GGSN3 according to this 50% probability in turn.

Hypothesis has 4 GGSN again, GGSN1, GGSN2, GGSN3 and GGSN4, and they have interface IP address GGSN IP1, GGSN IP2, GGSN IP3 and GGSN IP4 respectively; An APN---APN1.Referring to the configuration of table 5, as far as this APN, when carrying out the step of previous embodiment, preferentially select GGSN1, under the situation of GGSN1 fault, select GGSN2, under the situation of GGSN2 also fault, select GGSN2 and GGSN3 in turn.

Table 5

Hypothesis has a GGSN again, and this GGSN has two interface IP address GGSN IP1 and GGSN IP2; An APN---APN1.Referring to the configuration of table 6, as far as this APN, when carrying out the step of previous embodiment, for this APN, according to the configuration of table 6, should polling this two interface IP address GGSN IP1 and GGSN IP2.

Table 6

For in practical application through corresponding each parameter of IP address of configuration of APN, for example: priority parameters and weight parameter, can accomplish the problem of choose reasonable GGSN interface IP address under the complicated networking scene.

Step on outside the parameter with the corresponding priority of GGSN IP, weight for configuration statically in SGSN equipment; In fact; For SGSN, can also receive the information of notifying its current capacity that GGSN initiatively sends, according to these information; SGSN also can revise aforesaid weight parameter at any time, gets to the purpose that dynamically arranges weight.

In fact, among aforesaid each embodiment, the operation of selecting GGSN both can use two parameters to select simultaneously according to priority argument or weight parameter; Also can be only select according in two parameters any one; Certainly, this need change configuring condition aforementioned as table 1-table 6, specifically how to change; Capital and interest and technical staff can accomplish based on aforesaid instruction and enlightenment, repeat no more at this.

In addition; Those skilled in the art are except can be according to aforementioned each embodiment configuration preference level parameter of the present invention and the weight parameter on SGSN equipment; Also can the technical scheme of previous embodiment of the present invention be expanded to DNS equipment, make to comprise simultaneously and corresponding priority parameters in IP address and weight parameter in the IP address list of DNS equipment, like this; These parameters also can be configured by the equipment beyond SGSN, for example directly configuration in DNS equipment.

Therefore; The operation of the GGSN IP address table of aforementioned arrangements specifically can be used for being used to set up according to this GGSN IP address choice the network element of the GGSN of communication; For example: IP address table of storage among SGSN, the DNS comprises in this IP address table: APN, the IP address corresponding with this APN, the priority parameters and the weight parameter of this IP address at least.To aforesaid IP address table, can safeguard through the above-mentioned section of setting, for example: upgrade the pairing weight parameter in selecteed GGSN IP address; And upgrade the pairing priority parameters in selecteed GGSN IP address.

Need to prove: those skilled in the art are understood that above-mentioned be provided with priority, the isoparametric operation of weight fully; And the operation of upgrading these parameters can be in office carries out after when, and the ordinal relation of selecting the operation of corresponding GGSN not confirm with these parameters of the aforementioned use of the present invention.Equally; Obtaining and being provided with for priority parameters and weight parameter; In each embodiment of the present invention, do not do any qualification yet; Those skilled in the art and can set fixing priority parameters and weight parameter in advance, also can through to GGSN equipment testing, statistics obtaining priority argument, weight parameter or to be used to calculate the information of obtaining priority argument, weight parameter, and respectively priority parameters and weight parameter are selected and dynamic modification, replacement according to concrete capacity of equipment and technical indicator; Certainly; Also can the network planning or the requirement of actual networking, according to main and backup status or the networking planning definition priority of GGSN, also can be according to the priority and the weight of information such as the capacity decision GGSN IP address of GGSN; How to be provided with and when to be provided with priority argument and weight parameter in a word, those skilled in the art can implement according to the needs of reality fully, repeat no more at this.

Based on each above-mentioned embodiment; One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be accomplished through the relevant hardware of program command; Aforesaid program can be stored in the computer read/write memory medium; This program the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as static memory (ROM), dynamic memory (RAM), magnetic disc or CD.

In addition, in order to realize another aspect of the present invention, the equipment of following support packet switching is provided in other embodiment of the present invention; Referring to Fig. 4; This equipment is used for portable terminal is carried out mobile management or session, and this equipment can be SGSN, comprises following parts at least:

The first parts S1 is used for the PDP context activating request message that mobile terminal receive sends, and obtains corresponding APN information;

The second parts S2 is used for according to APN information acquisition and one or more GGSN IP address and upstate thereof;

The 3rd parts S3 is used for selecting available GGSN IP address according to the upstate of GGSN IP address;

The 4th parts S4 is used for according to the available pairing parameter in GGSN IP address, selects to be used to set up the GGSN of communication.

Relevant the said equipment is used to set up the GGSN technical scheme of communication according to concrete selection of APN, and the embodiment referring to above-mentioned each method repeats no more at this.Yet; Referring to Fig. 5; This SGSN can be provided with a memory cell S5 who is used for the configuration of IP address table, comprises in the IP address table that disposes among this memory cell S5: with the GGSN IP address of aforementioned APN information matches and with corresponding priority parameters in GGSN IP address and/or weight parameter etc.

For the second parts S2; These second parts S2 can connect a dns server (not shown); When obtaining APN; The second parts S2 sends a request of inquiring about corresponding GGSN IP address to dns server, and this dns server is asked according to this, returns the one or more GGSN IP address of mating with this APN to the second parts S2.

In order can the IP address table of being preserved in the aforementioned memory cell to be configured, to upgrade, on the basis of above-mentioned each embodiment, can also further set up the cell S 6 that is used to upgrade the pairing weight parameter in selecteed GGSN IP address; To be used to upgrade the cell S 7 of the pairing priority parameters in selecteed GGSN IP address.These unit are connected with aforesaid memory cell, and can revise wherein each parameter.

Need to prove: each above embodiment, no matter method or equipment are not limited in gprs system, use.In fact; Demal multi-address inserts (Wideband Code-DivisionMultiple-Access in the broadband; Hereinafter to be referred as: WCDMA) system, TD SDMA insert that (TimeDivision-Synchronous Code Division Multiple Access is hereinafter to be referred as TD-SCDMA) the same operation that exists like Fig. 1, the network architecture shown in Figure 2 and identical PDP context activating in the system.Therefore, aforesaid each embodiment of the present invention is applicable to WCDMA too, among the system of TD-SCDMA.

What should explain at last is: above each embodiment is only in order to technical scheme of the present invention to be described but not limit the invention; Although with reference to above-mentioned each embodiment main technical schemes of the present invention is specified, those of ordinary skill in the art is to be understood that: it still can be made amendment on the technical scheme basis of aforementioned each embodiment of the present invention or be equal to replacement; And these are revised or be equal to spirit and the scope that replacement does not break away from the technical scheme that each embodiment of the present invention disclosed.

Claims

1. a method of selecting server is characterized in that, comprising:

After SGSN receives the request of mobile terminal activating PDP Context,, obtain one or more GGSN IP addresses according to asking corresponding APN information with this;

SGSN obtains the upstate of the corresponding GGSN in said GGSN IP address;

SGSN obtains optional GGSN IP address according to the upstate of the corresponding GGSN in said GGSN IP address;

SGSN selects to be used to set up the GGSN of communication according to optional GGSN IP address and corresponding parameters thereof, and described parameter comprises priority parameters and weight parameter; Said basis is asked corresponding APN information with this, obtains one or more GGSN IP addresses and is specially:

Read one or more the GGSN IP addresses corresponding of writing down in the stored IP address table in the SGSN equipment with said APN.

2. method according to claim 1 is characterized in that: said basis is asked corresponding APN information with this, obtains one or more GGSN IP addresses and further comprises:

Send the request of obtaining GGSN IP address to dns server;

Receive the GGSN IP address list corresponding that dns server returns, comprise one or more GGSN IP addresses in the said address list with said APN.

3. method according to claim 1 is characterized in that: said according to optional GGSN IP address and corresponding parameters thereof, select to be used to set up the GGSN of communication, and specifically comprise:

When said optional GGSN IP address was one, selecting the corresponding GGSN in this optional GGSN IP address was the said GGSN that is used to set up communication;

When said optional GGSN IP address is one when above, further selecting the corresponding GGSN in optional GGSN IP address according to said GGSN IP address corresponding priorities parameter and weight parameter is the said GGSN that communicates by letter that is used to set up.

4. method according to claim 3; It is characterized in that; Also comprise: representing maximum optional GGSN IP address when said weight parameter is one when above; According to the selecteed probability in said optional GGSN IP address, selection is corresponding with a said optional GGSN IP address in turn, and perhaps selecting with a said optional GGSN IP corresponding GGSN in address arbitrarily is the said GGSN that is used to set up communication.

5. according to the described arbitrary method of claim 1-2; It is characterized in that; Also comprise: the step of pre-configured IP address table; Specifically:, comprise at least in the said IP address table: the priority parameters and the weight parameter of access points, the IP address corresponding, said IP address with said access points being used for being used to set up the network element storing IP address table of the GGSN of communication according to said GGSN IP address choice.

6. method according to claim 5 is characterized in that: also comprise the step that said IP address table is safeguarded, specifically comprise:

Upgrade the pairing weight parameter in selecteed GGSN IP address; And/or

Upgrade the pairing priority parameters in selecteed GGSN IP address.

7. method according to claim 6 is characterized in that: the pairing weight parameter in the selecteed GGSN IP of said renewal address specifically comprises:

Obtain the information of the current capacity of GGSN, and dynamically arrange the pairing weight parameter in said GGSNIP address according to the information of the current capacity of said GGSN.

8. an equipment of supporting packet switching is used for mobile management or session management, and said equipment is SGSN, it is characterized in that, said equipment comprises:

First parts are used for the PDP context activating request message that mobile terminal receive sends, and obtain corresponding APN information;

Second parts are used for according to said APN information acquisition one or more GGSN IP address and upstates thereof;

The 3rd parts are used for selecting available GGSN IP address according to the upstate of said GGSN IP address;

The 4th parts are used for according to the said available pairing parameter in GGSN IP address, select to be used to set up the GGSN of communication, and described parameter comprises priority parameters and weight parameter;

Also comprise with said second parts and being connected; The memory cell that is used for the configuration of IP address table comprises in the IP address table that disposes in this memory cell: with the GGSN IP address of said APN information matches and with corresponding priority parameters in said GGSN IP address and/or weight parameter.

9. equipment according to claim 8 is characterized in that: said second parts also connect and are used for the request of sending according to said second parts, return the dns server with one or more GGSN IP addresses of said APN information matches.

10. arbitrary equipment according to claim 8 is characterized in that, also comprises:

Be used to upgrade the unit of the pairing weight parameter in selecteed GPRS serving GPRS support node interconnection protocol address; And/or

Be used to upgrade the unit of the pairing priority parameters in selecteed GPRS serving GPRS support node interconnection protocol address.

11. equipment according to claim 9 is characterized in that, also comprises: