CN1453965A

CN1453965A - Group Domain communication method

Info

Publication number: CN1453965A
Application number: CN02118487A
Authority: CN
Inventors: 陈诚
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2002-04-27
Filing date: 2002-04-27
Publication date: 2003-11-05
Anticipated expiration: 2022-04-27
Also published as: CN1214578C

Abstract

In the method, another user can be called by the user through packet domain of public land mobile network according to mobile station international ISDN number and access point name. The IP address of the other party can be obtained automatically and communication between two users can be carried on with communication link set up based on IP.

Description

A kind of by the packet domain method for communicating

Technical field

The present invention relates to moving communicating field, relate in particular in the WCDMA/GPRS field, provide a kind of two user terminal UE (User Equipment) by Public Land Mobile Nerwork PLMN (Public Land MobileNetwork) packet domain method for communicating.

Technical background

In present mobile communication, communication network gradually by traditional GSM excessively to general packet radio service gprs (General Packet Radio Service) or the Wideband Code Division Multiple Access (WCDMA) WCDMA (WideCode Division Multiple Access) of 2.5G, communication network around a new generation, the work of improving that the scientific research personnel is not stopping, wherein the communication issue between the terminal use is exactly a relatively more popular research field.

The WCDMA/GPRS grid is made of core net and wireless access network, core net is divided into circuit domain and two subsystems of packet domain, circuit domain comprises moving exchanging center MSC (Mobile Switching Center), attaching position register HLR equipment such as (Home Location Register), speech business and the bearer service that links based on circuit is provided for the user, as video telephone, short message etc., its feature is the reliability height, but speed is low, the expense height; Packet domain comprises Serving GPRS Support Node SGSN (Serving GPRS SupportNode), GGSN GGSN (Gateway GPRS Support Node), domain name system DNS equipment such as (Domain Name System), for the user provides IP-based packet bearer business, as web page browsing, game on line, screen program request etc., its feature is that reliability is not high, but the speed height, expense is low.Shown in network configuration Fig. 1:

Heavy black line represents that two UE connect the formed communication link in back by circuit domain call among the figure.When a UE calls out another one UE, the calling party passes to MSC to call information through wireless access network, MSC is according to the positional information of called UE registration, call out called UE, between two UE, set up communication link then, can carry out speech business end to end or other bearer service based on circuit.

The bearing link that uses when heavy black line is represented UE visit external packet data network among the figure.When UE initiatively initiates to visit the external packet data net, activate message and be delivered to SGSN equipment through wireless access network, SGSN is according to the external network sign APN APN (Aceess Point Name) of UE visit, the GGSN address that obtains inserting by dns resolution, SGSN passes to GGSN activating message again, the GGSN termination activates message, sets up a bearing link from UE to GGSN, and UE just can use this bearing link access external data network then.GGSN can directly visit external network as the gateway device that inserts extenal grouped network, does not need to set up the link between GGSN and external server.

In present WCDMA/GPRS network, mainly contain following problem and exist:

1, in the WCDMA/GPRS network of deferring to 3GPP R99 and R4 release protocol, UE mainly is a visit external packet data network by the PLMN packet domain, can not call out another one UE by packet domain, and the calling between two UE can only be undertaken by circuit domain.Along with the 3GPP agreement to the evolution of R5 version, the packet domain of core net and circuit domain will develop into the packet network of an all-IP, can realize mutual calling between two UE by the all-IP net, but need make big change to present equipment of the core network, and need increase miscellaneous equipment, full-fledged still needing the time.

2, at present in the WCDMA/GPRS network, two UE can adopt following method to visit mutually: the static ip address that belongs to same APN is all arranged, and communicating pair UE knows this static ip address of the other side, when their simultaneously (need initiatively to activate when same APN and same GGSN activate context, can not call out mutually), use the outer Special Equipment of GGSN equipment that their IP datagram is carried out routing forwarding, can realize the mutual visit between two UE.But this method is used inconvenient, and restriction is a lot, is difficult to carry out actual large-scale application, more is used for demonstration or test.

3, two UE by circuit domain call with communicate by letter, need monopolize the circuit resource of Radio Resource and core net; And packet domain adopts IP-based transmitted in packets mode, and corresponding Radio Access Network also is to adopt the multiplexing mode of sharing, so if can effectively utilize Internet resources and reduce cost by the packet domain communication between UE.

4, two bearing links that UE sets up by circuit domain are subjected to speed limit, and bearer service is limited; And UE that sets up by packet domain and UE communication link end to end, speed can reach 384kbps, can carry at present any applied business based on the IP grouping.

5, functional expenses such as the voice that undertaken by circuit domain, video telephone are very high, and use the transmission cost of packet domain cheaper.

Can clearer understanding technical background of the present invention for the ease of your auditor, existing the existing several key technologies of moving communicating field are done an explanation.

Attaching position register HLR (Home Location Register): attaching position register, be to be used for the database of travelling carriage is managed, major function has: all customer parameters of the travelling carriage of registering among the HLR are managed and the renewal of modification, accounting management, VLR etc.

Insert user's remote authentication service RADIUS (Remote Authentication Dial in UserService): insert the service of user's remote authentication, it is a kind of method of centralized management client on a switch or many switch VPN, RADIUS is used for discriminating and the authorization message between integration networks access server (VPN switch) and the central authorization services device (RADIUS Server, definition in RFC 2138).

AAA SERVER:AAA server is the identity that is used for identifying the visitor, and this server will be carried out " checking ", " mandate " and " record " three steps.The Radius function that general title comprises the Radius billing function is an aaa functionality.

Gateway support node GSN (GPRS Support Node): be most important network node in the GPRS network, also use in the WCDMA network.GSN has mobile routing management function, and it can connect various types of data networks, and can link attaching position register, and the data that can finish between travelling carriage and the various data network transmit and format conversion.GSN can be a kind of autonomous device that is similar to router, also can integrate with the MSC among the GSM.GSN has two types: a kind of is Serving GPRS Support Node SGSN (Serving GPRS Support Node), another kind is GGSN GGSN (GatewayGPRS Support Node), the main effect of SGSN is the current location information of record travelling carriage, and finishes the transmission and the reception of mobile packet data between travelling carriage and GGSN.GGSN mainly has been the gateway effect, and it can be connected with multiple different data network, as ISDN, PSPDN and LAN etc.In the document that has, GGSN is called the GPRS router.GGSN can carry out protocol conversion to the GPRS packet data package in the GSM net, thereby can be sent to the TCP/IP of far-end or network X.25 to these packet data package.

Summary of the invention:

Purpose of the present invention is exactly to provide between a kind of UE and the UE by PLMN to call out and set up the simple and practical method of safeguarding IP-based communication link mutually by packet domain, to enrich the function of WCDMA/GPRS system, effectively utilizes Internet resources, reduces user cost.

A kind of by the packet domain method for communicating, it is characterized in that the user calls out other user according to Mobile Subscriber International ISDN number MSISDN (Mobile Station International ISDN Number) and APN APN (AccessPoint Name) by the PLMN packet domain, sets up IP-based communication link and communicates between two user terminal UE (UserEquipment).The described communication link of setting up comprises the steps:

A, UE1 initiate request to GGSN, and this request message carries the APN that the user selects;

B, GGSN analyze the content of this request message, generate new APN according to carrying APN in the message, search the configuration information whether this new APN is arranged at GGSN, if having, enter step C, if do not have, then handle according to normal activation process;

C, the network side of searching GGSN according to called number MSISDN activate configuration information, obtain IMSI and the IP address of called subscriber UE2, enter step D; If search failure, then return the activation failed message to the SGSN of UE1, SGSN reselects GGSN again and activates;

D, GGSN create the user's context of UE1, UE2 is initiated network side activate, and the APN in the message regenerates and enters step e; If network side activates failure, then return failed message, process ends to U1;

E, GGSN receive the context activation request message of the response to network side activating of UE2, analyze message content, carry out condition query, as pass through, and continue step F, do not pass through then process ends;

F, GGSN are UE1 context Resources allocation, for UE2 creates user's context and Resources allocation, return to UE1, UE2 after finishing and activate successful respond message, and the context that UE1 and UE2 be set is interrelated context, to be used for the data forwarding between UE1 and UE2; If the activation of any one UE failure, then GGSN returns the response message of failure, deletes the context of another UE;

End-to-endly between G, UE1 and UE2 carry out ppp negotiation,, enter step H if consult to pass through; Do not pass through, then process ends;

H, according to the attribute of APN, user's remote authentication service Radius (Remote Authentication Dial in User Service) charging process initiated to insert in the context of two UE, if pass through, enter step I, if any one charges unsuccessful, then two contexts are all deleted, process ends;

I, link connect to be finished, and communicates between UE.

Describedly comprise also that by the packet domain method for communicating is provided with a GGSN step; It is provided with content and comprises:

A, the APN that supports UE to call out UE are provided with;

B, activate at network side and to increase the MSISDN data item in the configuration.

The APN form is in the described steps A: the specific APN title of called MS ISDN., this specific APN title can be sky.

Described step B analyzes this message content and comprises: if the context activation message of this message PPP type and meets APN form in the steps A, then first label of APN is designated as called UE 2 numbers, the aft section label as a new APN title.

The APN form that produces in the APN form that regenerates among the described step D and the steps A is identical, and first tag modification of the APN that UE1 is used becomes the number that activates the calling subscriber UE1 that extracts the message from UE1.

In the described step e, analyze message content and comprise:

A, whether be the context activation message of PPP type;

Carry APN in B, the message whether as the form described in the steps A and identical with APN among the step D;

Whether first label of C, APN is identical with calling UE 1 number MSISDN, should have the context that is activating to exist when GGSN searches according to this MSISDN;

D, APN aft section label search configuration information as new APN at GGSN, and GGSN should be configured to the special APN that UE calls out UE to this new APN, and identical with the suffix portion of the APN of UE1 use.

Ppp negotiation process among the described step G comprises:

A, LCP negotiations process;

B, authentication process;

C, NCP negotiations process.

Described LCP negotiations process comprises:

The Qos that GGSN obtains link-quality negotiation data bag and GTP agreement regulation shines upon, and after LCP consults to finish, initiates network side and upgrades the Qos process, makes two contextual Qos unanimities of UE;

GGSN and two UE consult authentication mode, determine whether authentication is carried out authentication with use PAP or CHAP; If LCP consults not by then deleting the context of two UE, otherwise carries out authentication process.

Described authentication process comprises:

GGSN analyzes the authentication request message of two UE in the ppp negotiation authorization phase, carries out the Raius authentication according to the APN attribute, if a UE failed authentication is arranged, then the context of two UE is all deleted; If all successes are carried out NCP and are consulted;

Described NCP negotiations process comprises: GGSN is that UE1 distributes dynamic IP addressing, and the ipcp negotiation behavior of GGSN simulation UE is carried out the IP address negotiation with two UE respectively then, makes two UE obtain the IP address of its own IP address and opposite end UE;

When UE2 used static address and opposite end to consult, GGSN need check the legitimacy of this IP address according to the network side active information of configuration;

In the process of communication, also comprise the process that Qos (Quality of Service) upgrades.In the WCDMA system, described Qos renewal process is:

(1) UE1 or SGSN initiate the Qos update inquiry information, and after GGSN received the Qos update request, the Qos that the user is asked held consultation, and according to the Qos after consulting UE2 are initiated the network side update inquiry information;

(2) after SGSN and UE2 hold consultation to the Qos of network side request and handle, return Qos to GGSN and upgrade and reply; If GGSN receives the renewal failure of UE2 and replys, then return Qos renewal failure and reply to UE1, context remains unchanged;

(3) if GGSN receives the Qos renewal successful respond that UE2 returns, then UE1 and UE2 are carried out more other processes of new technological process, the success back is returned Qos to UE1 and is upgraded successful respond; If more new technological process is unsuccessful normally, then delete two contexts; (4) if GGSN receives the renewal process that SGSN initiates because of other reason, only upgrade the context of current UE, another one UE is not initiated renewal process, identical with the normal process method.

Upgrade if GGSN initiatively initiates Qos, then need two contextual Qos of UE are upgraded simultaneously.

Described by the packet domain method for communicating, also comprise a flow process of removing communication link:

(1) when device trigger deleting communication links such as UE1 or SGSN, at first delete ppp link, GGSN monitoring link demolishing process reclaims the resources such as dynamic IP addressing of distributing, and UE1 initiates context deletion message to GGSN then;

When (2) GGSN received the deletion message of UE1, deletion GGSN context distributed resource was returned deletion successful respond message to this UE1 then, initiates Radius charging terminal procedure again;

(3) simultaneously GGSN initiates the contextual process of network side deletion UE2, and after this UE2 returned deletion and replys, the resources such as this UE2 context resource that deletion GGSN distributes were initiated Radius charging terminal procedure again, and link circuit deleting is finished.

If during UE context of deletion that GGSN initiates, need to trigger simultaneously the context of another UE of deletion, GGSN also needs to participate in the ppp link demolishing process, reclaims resources such as IP address.

The present invention provides between a kind of UE and the UE at PLMN and calls out and set up the simple and practical method of safeguarding IP-based communication link mutually by packet domain, has enriched the function of WCDMA/GPRS system, has effectively utilized Internet resources, reduces user cost.

Description of drawings

Fig. 1 is the schematic diagram of communicating by letter between the UE in the prior art;

Fig. 2 is the schematic diagram of communicating by letter between UE after the invention process;

Fig. 3 is that a communication link of the present invention connects schematic flow sheet;

Qos upgrades schematic flow sheet between the UE that Fig. 4 right and wrong GGSN initiatively initiates;

Fig. 5 is that Qos upgrades schematic flow sheet between the UE that initiatively initiates of GGSN;

The dismounting communication link schematic flow sheet that Fig. 6 right and wrong GGSN initiatively initiates;

Fig. 7 is the dismounting communication link schematic flow sheet that GGSN initiatively initiates.

Embodiment

Below in conjunction with Figure of description the specific embodiment of the present invention is described.

As shown in Figure 2, the present invention will make to set up between the UE as shown in the figure that the communication link shown in the black fine rule communicates.External hardware environment of the present invention comprises GGSN, SGSN, and HLR, DNS, UE etc. call out other user according to Subscriber Number MSISDN and APN by the PLMN packet domain, set up IP-based communication link and communicate between two users.GGSN to system carries out following setting:

1, the APN that supports UE to call out UE is provided with, as stipulate the specific for this reason APN of huawei.com, use during customer call " called MS ISDN.huawei.com ", then the attribute that need dispose this APN huawei.com at GGSN is: preference pattern=1, supporting business type=PPP type, other attribute is identical with generic configuration

2, configuration network side activating information: the network side in standard activates increase MSISDN data item in the configuration, and other configurations all are standards

As shown in Figure 3, method of the present invention specifically may further comprise the steps:

UE1 activates the PPP type context, the request message of initiating carries the APN that the user selects, the APN form is as follows: the specific APN title of called MS ISDN., as 13641091737.wcdma.com, first label 13641091737 number that is called subscribers wherein, the label wcdma.com of back is the APN title used when packet domain is called out another UE passed through of operator regulation, and this label can at will use one, as long as other label collision of discord; The form of this request message " the specific APN title of called MS ISDN. " is a new regulation of the present invention, and the APN title in existing standard is the same with the general network address format that uses, as www.sina.com.cn etc.Wherein " specific APN title " can be sky in the form, only need import the other side's phone number just when the user uses so, can make things convenient for client's use so greatly.

B, GGSN analyze the content of this request, produce new APN form, search the configuration information whether this new APN is arranged at GGSN, if having, enter step C, if do not have, then handle according to normal activation process;

After GGSN receives UE1 activation request message, content to this message is analyzed, if the PPP type context activates message, and carry APN in the message and be as the form described in the A step, then first label of APN is designated as called UE 2 numbers (MSISDN), the aft section label as a new APN title, is searched the configuration information whether this new APN is arranged at GGSN.If this kind configuration mode is arranged, and be configured to the special APN that UE calls out UE, think that then this activation is the activation request that UE1 calls out UE2; Otherwise handle according to normal activation process.

C, the network side of searching GGSN according to called number activate configuration information, obtain IMSI and the IP address of UE2, enter step D; If search failure, then return the activation failed message to the SGSN of UE1, SGSN reselects GGSN again and activates;

Look into the network side activation configuration information of GGSN according to the called number MSISDN of record, each user with network side mobilizing function has following deploy content: MSISDN, IMSI, IP address, the affiliated APN in IP address at least, APN in general regulation under a configuration parameter: IMSI, IP address and the IP address, the present invention just increase a MSISDN in configuration.

By this IMSI and the IP address that obtains called subscriber UE2 of searching; If search failure, illustrate that this GGSN does not support called subscriber's network side to activate, then return the activation failed message to the SGSN of UE1, can reselect the GGSN that supports called subscriber UE2 network side to activate according to the SGSN of agreement UE1 and activate;

D, GGS create the user's context of UE1, UE2 is initiated network side activate, and the APN in the message regenerates, and enters step e; If network side activates failure, then return failed message, process ends to U1;

GGSN creates the user's context of UE1, called subscriber UE2 is initiated network side activation, APN in the message regenerates, described in form such as the A, but first tag modification is become the number that activates the calling subscriber UE1 that extracts the message from UE1, the APN that uses when the aft section label substance activates with UE1 is the same, and as 13688856789.wcdma.com, wherein 13688856789 is rear subscriber numbers;

If network side activates failure, call failure, GGSN should be deleted and call out all relevant resources therewith, return to UE1 and activate the failure response message; Otherwise wait for that UE2 initiates the activation request message of response to network side activating;

E, GGSN analyze message content, carry out condition query, as pass through, and continue step F, do not pass through then process ends;

GGSN analyzes message content after receiving the response activation request message of UE2, checks whether meet the following conditions:

A, be that the PPP type context activates message;

Carrying APN in b, the message is as (1) described form and identical with the APN of UE1 use;

First label of c, APN is identical with calling UE 1 number MSISDN, should have the context that is activating to exist when GGSN searches according to this MSISDN;

D, APN aft section label search configuration information as new APN at GGSN, and GGSN should be configured to the special APN that UE calls out UE to this new APN, and identical with the suffix portion of the APN of UE1 use;

If the full up foot of above condition is then thought the activation message that UE2 response UE1 calls out; Do not satisfy if having ready conditions, then process ends.

F, GGSN are UE1 context Resources allocation, for UE2 creates user's context and Resources allocation, return to UE1, UE2 after finishing and activate successful respond message, and the context that UE1 and UE2 be set is interrelated context, to be used for the data forwarding between UE1 and UE2; If activate failure arbitrarily, then GGSN returns the response message of failure, and deletes the context of another UE;

GGSN is the context Resources allocation of UE1, returns activation successful respond message to UE1 after finishing; Be that UE2 creates user's context and Resources allocation, need special the processing when context Qos of called subscriber UE2 is consulted, the negotiation value that makes it as far as possible and the contextual Qos negotiation of UE1 value difference apart from minimum, return success the activation response message to UE2 after finishing;

If UE1 or UE2 activate failure, GGSN returns the failure response message, and initiatively triggers the context of deletion another one UE; If all successes, the context that two UE are set is interrelated context, to be used for two data forwarding between UE; If behind the context of another UE of deletion, the resource relevant therewith GGSN all discharges.

G, carry out ppp negotiation between UE1 and UE2,, enter step H if consult to pass through; Do not pass through, then process ends is initiated request again;

So far, the communication link (physical layer that is equivalent to ppp protocol) between two UE builds up, and next carries out ppp negotiation (deferring to 3GPP agreement and RFC agreement) between two UE, is divided into LCP negotiation, authentication, NCP and consults three phases.By GGSN monitoring ppp negotiation process,, need ppp negotiation packets such as the negotiation of analyzing and processing link-quality, authentication, IP address negotiation, but the behavior of GGSN should be transparent to two UE as the relaying that two UE carry out ppp negotiation.

To not needing the PPP information bag of GGSN analyzing and processing, GGSN only is responsible for transmitting between two UE: the upstream data newspaper to UE1 sends after GGSN finds context, according to UE1 and two contextual incidence relations of UE2, sends to UE2 as downlink data; To the upstream data newspaper that UE2 sends, GGSN sends to UE1 with same procedure;

At first be that LCP negotiations process: GGSN obtains link-quality negotiation data bag, shine upon with the Qos of GTP agreement regulation, after LCP consults to finish, initiate network side and upgrade the Qos process, make two contextual Qos unanimities of UE (this function is optional, and the Qos that initiates referring to GGSN is new technological process more); GGSN also needs to consult authentication mode with two UE, determines whether authentication is carried out authentication with use PAP or CHAP; If LCP consults not by then deleting the context of two UE, otherwise carries out authentication process;

Authentication process: GGSN analyzes the authentication request message of two UE in the ppp negotiation authorization phase, carries out the Radius authentication according to the APN attribute, if a UE failed authentication is arranged, then the context of two UE is all deleted; If all successes are carried out NCP and are consulted; Need related resource full scale clearance behind the deletion message, whether initiate again to determine by the user GGSN;

NCP negotiations process: NCP consults to comprise the negotiation of network layers such as IPCP, IPXCP, is that example describes here with IPCP.GGSN is that UE1 distributes dynamic IP addressing (if UE2 uses the dynamic address network side to activate, also need to be UE2 distributing IP address), the ipcp negotiation behavior of GGSN simulation UE then, carry out the IP address negotiation with two UE respectively, make two UE obtain GGSN and be the dynamic IP addressing of its distribution and the IP address of opposite end UE;

When UE2 used static address and opposite end to consult, GGSN need check the legitimacy of this IP address according to the network side active information of configuration.

H, according to the attribute of APN, the Radius charging process initiated in the context of two UE, if pass through, enter step I, unsuccessful if any one charges, then two contexts are all deleted, process ends;

After ppp negotiation between two UE is finished, according to the attribute of APN, the Radius charging process initiated in the context of two UE, if wherein any one charges unsuccessfully, then two contexts are all deleted; Need related resource full scale clearance behind the deletion message, whether initiate again to determine by the user GGSN.

I, link connect to be finished, and communicates between UE.

So far, access success and communication link are set up and are finished, and can move any IP-based application software; GGSN is responsible for transmitting two packets between UE: receive the upstream data bag of a UE, search context, conduct a survey, be transmitted to another UE as the downlink data newspaper.

Shown in Fig. 4,5, the present invention can also comprise the process that Qos upgrades in the communication process that is undertaken by PLAM between UE, and in the WCDMA system, described Qos renewal process is:

(1) UE or SGSN initiate the Qos update inquiry information, and after GGSN received the Qos update request, the Qos that the user is asked held consultation, and according to the Qos after consulting UE2 are initiated the network side update inquiry information;

(3) if GGSN receives the Qos renewal successful respond that UE2 returns, then UE1 and UE2 are carried out more other processes of new technological process, the success back is returned Qos to UE1 and is upgraded successful respond; If more new technological process is unsuccessful normally, then delete two contexts;

(4) if GGSN receives SGSN because other reason, the renewal process of initiation is only upgraded the context of current UE, another one UE is not initiated renewal process, and is identical with the normal process method.

If it is that GGSN initiatively initiates that above-mentioned Qos upgrades, then need as requested two contextual Qos of UE are upgraded simultaneously.

Shown in Fig. 6,7, in the present invention, also comprise a process of removing communication link:

(1) when device trigger deleting communication link such as certain UE1 or SGSN, at first according to 3GPP agreement and RFC agreement deletion ppp link, GGSN monitoring link demolishing process reclaims the resources such as dynamic IP addressing of distributing, and UE1 initiates context deletion message to GGSN then;

When (2) GGSN received the deletion message of UE1, deletion GGSN context distributed resource was returned deletion successful respond message to UE1 then, initiates Radius charging terminal procedure again;

(3) simultaneously GGSN initiates the contextual process of network side deletion UE2, and after UE2 returned deletion and replys, the resources such as UE2 context resource that deletion GGSN distributes were initiated Radius charging terminal procedure again, and link circuit deleting is finished.

During UE context of deletion that if this dismounting is GGSN to be initiated, need to trigger simultaneously the context of another UE of deletion, GGSN also needs to participate in the ppp link demolishing process, reclaims resources such as IP address.

The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with the people of this technology in the disclosed technical scope of the present invention; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claims.

Claims

1, a kind of by the packet domain method for communicating, it is characterized in that user terminal UE (User Equipment) is according to Mobile Subscriber International ISDN number MSISDN (Mobile Station International ISDN Number) and APN APN (Access Point Name), call out other user by Public Land Mobile Nerwork PLMN (PublicLand Mobile Network) packet domain, between two users, set up IP-based communication link and communicate.

2, as claimed in claim 1 by the packet domain method for communicating, it is characterized in that the described communication link of setting up comprises the steps:

A, UE1 initiate request to GGSN GGSN (Gateway GPRS Support Node), and this request message carries the APN that the user selects;

B, GGSN analyze the content of this request message, generate new APN according to the APN that carries in the message, search the configuration information whether this new APN is arranged at GGSN, if having, enter step C, if do not have, then handle according to normal activation process;

C, the network side of searching GGSN according to called number MSISDN activate configuration information, obtain IMSI International Mobile Subscriber Identity IMSI (International Mobile Subscriber Identity) and the IP address of called subscriber UE2, enter step D; If search failure, then return the activation failed message to the Serving GPRS Support Node SGSN of UE1 (Serving GPRS Support Node), SGSN reselects GGSN again and activates;

D, GGSN create the user's context of UE1, UE2 is initiated network side activate, and the APN in the message regenerates, and enters step e; If network side activates failure, then GGSN returns failed message, process ends;

I, link connect to be finished, and communicates between UE.

3, as claimed in claim 2 by the packet domain method for communicating, it is characterized in that also comprising one the GGSN step is set; It is provided with content and comprises:

A, the APN that supports UE to call out UE are provided with;

4, as claim 2 or the 3 described packet domain method for communicating of passing through, it is characterized in that the APN form is in the described steps A: the specific APN title of called MS ISDN., wherein this specific APN title can be sky.

5, as claimed in claim 4 by the packet domain method for communicating, it is characterized in that described step B analyzes this message content and comprises: if the context activation message of this message peer-peer protocol PPP (Point to Point Protocol) type, and meet the APN form in the steps A, then first label of APN is designated as called UE 2 numbers, the aft section label as a new APN title.

6, as claimed in claim 5 by the packet domain method for communicating, it is characterized in that the APN form that produces in the APN form that regenerates among the described step D and the steps A is identical, use UE1 first tag modification of APN to become the number that activates the calling subscriber UE1 that extracts the message from UE1.

7, as claimed in claim 4 by the packet domain method for communicating, it is characterized in that analyzing in the described step e message content and comprise:

A, whether be the context activation message of PPP type;

Carry APN in b, the message whether as the form described in the steps A and identical with the APN of step D;

8, as claim 2 or the 3 described packet domain method for communicating of passing through, it is characterized in that the ppp negotiation process among the described step G comprises:

A, LCP LCP (Link Control Protocol) negotiations process;

B, authentication process;

C, Network Control Protocol NCP (Network Control Protocol) negotiations process.

9, as claimed in claim 8 by the packet domain method for communicating, it is characterized in that described LCP negotiations process comprises:

The Qos (Quality ofService) that GGSN obtains link-quality negotiation data bag and GTP agreement regulation shines upon, and after LCP consults to finish, initiates network side and upgrades the Qos process, makes two contextual Qos unanimities of UE;

GGSN and two UE consult authentication mode, determine whether authentication is carried out authentication with use PAP or CHAP;

If LCP consults not by then deleting the context of two UE, otherwise carries out authentication process.

10, as claimed in claim 8 by the packet domain method for communicating, it is characterized in that described authentication process comprises:

GGSN analyzes the authentication request message of two UE in the ppp negotiation authorization phase, insert user's remote authentication service Radius (Remote Authentication Dial in UserService) authentication according to the APN attribute, if a UE failed authentication is arranged, then the context of two UE is all deleted; If all successes are carried out NCP and are consulted.

11, as claimed in claim 8 by the packet domain method for communicating, it is characterized in that described NCP negotiations process comprises:

GGSN is that UE1 distributes dynamic IP addressing, and the ipcp negotiation behavior of GGSN simulation UE is carried out the IP address negotiation with two UE respectively then, makes two UE obtain the IP address of its own IP address and opposite end UE;

12, as claim 1, the 2 or 3 described packet domain method for communicating of passing through, it is characterized in that in the process of communication, also comprising the process that Qos upgrades.

13, pass through the packet domain method for communicating between UE as claimed in claim 12, it is characterized in that in the WCDMA system described Qos renewal process is:

(4) if GGSN receives the renewal process that SGSN initiates because of other reason, only upgrade the context of current UE, another one UE is not initiated renewal process, identical with the normal process method.

14, as claimed in claim 13 by the packet domain method for communicating, it is characterized in that then needing two contextual Qos of UE are upgraded simultaneously if GGSN initiatively initiates Qos to be upgraded.

15, as claim 2 or the 3 described packet domain method for communicating of passing through, it is characterized in that also comprising a step of removing communication link:

16, as claimed in claim 15 by the packet domain method for communicating, it is characterized in that if during UE context of deletion that GGSN initiates, need to trigger simultaneously the context of another UE of deletion, GGSN also needs to participate in the ppp link demolishing process, reclaims resources such as IP address.