CN101026546A

CN101026546A - Method for realizing packet data session

Info

Publication number: CN101026546A
Application number: CNA2006100083813A
Authority: CN
Inventors: 王洁
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2006-02-21
Filing date: 2006-02-21
Publication date: 2007-08-29

Abstract

The method includes following steps: when mobile terminal initiates packet data session, the method establishes traffic channel between mobile terminal and traffic RAN, and R-P connection between RAN and traffic PDSN; building PPP session between PDSN and mobile terminal, and determining HoA and CoA of mobile terminal by PDSN; PDSN initiates binding HoA and CoA of mobile terminal to HA, and keeping HoA unchanged in procedure of packet data session; after ending packet data session, releasing binding of HoA and CoA of mobile terminal, and releasing R-P connection between RAN and traffic PDSN and traffic channel between mobile terminal and traffic RAN. Under condition that mobile terminal does not support mobile IP, the invention can keep traffic continuity when carrying switching across PDSN. When network supports quick switching, using quick switching reduces time delay of traffic data transmission further.

Description

A kind of method that realizes grouping data conversation

Technical field

The present invention relates to a kind of method that in such as the mobile communication system of CDMA2000 system, realizes grouping data conversation.

Background technology

In existing C DMA2000 system, data packet services node (PDSN, Packet DataServing Node) by point-to-point protocol (PPP, Point-to-Point Protocol) will insert IP network such as the portable terminal of travelling carriage (MS), its effect is similar to access server, the route of next jumping is provided for packet data package simultaneously, and by IP control protocol (IPCP, IP Control Protocol) be portable terminal distributing IP address.

Existing C DMA2000 system, comprise 3G1x and HRPD (high rate packet data) (HRPD, High RatePacket Data) system, data rate up to 153.6kbps can be provided, can carry out grouping data services such as video request program (VOD), network gaming, high-speed data download, it is very important how carrying out the service mobility management effectively, and one of purpose of professional mobile management is to guarantee professional continuity when portable terminal moves.In Wireless IP network, professional mobility realizes by switching, when occurring between the wireless access network (RAN, Radio AccessNetwork) that connects identical PDSN when switching, service PDSN before and after switching is same PDSN, and therefore this switching is called as switching in the PDSN; When switching occurred between the RAN that connects different PDSN, the service PDSN before and after switching was not same PDSN, and therefore this switching is called as and strides PDSN and switch.For switching in the PDSN, owing to do not change access point, do not relate to the change of IP address, can keep professional continuity so only need to carry out link switchover.Switch for striding PDSN, access point changes, and can't keep professional continuity this moment by simple link switchover, and need keep professional continuity in more complicated mode.

In the prior art, stride PDSN when moving at portable terminal, can keep business continuance by mobile IP technology, the mobile IP technology cardinal principle is: when mobile terminal roaming arrives field network, obtain a Care-of Address (CoA by configuration or by Foreign Agent, Care-of Address), home network IP address dynamic or static allocation is home address (HoA, Home Address), by to home agent (HA, Home Agent) registration is with CoA and HoA binding, so that the data of communication counterpart can accurately route to the portable terminal that is in roaming position.

Fig. 1 adopts mobile IP technology to realize the basic procedure schematic diagram of grouping data conversation.Flow process shown in Figure 1 is to be example with the mobile IPv 4, and because the present invention does not relate to identifying procedure, so in Fig. 1, ignored identifying procedure, and this call flow does not relate to the situation that PDSN switches of striding.Suppose that RAN shown in Figure 1 is not the RAN of MS home network, but current service RAN, PDSN is current service PDSN.As can be seen from Figure 1, adopt mobile IP technology but do not have to stride and realize when PDSN switches that the basic procedure of grouping data conversation roughly comprises following steps:

Step 101:MS initiation packet data session is set up the Traffic Channel between MS and the RAN, and RAN is connected with R-P (RAN-PDSN) between the PDSN.

Step 102: set up the PPP session between PDSN and the MS, PDSN is that MS distributes the CoA of an IP address as MS, or with the IP address of the PDSN CoA as MS itself, the HoA address of MS is the home network IP address allocated.

Step 103:MS carries out the address registration process of mobile IP, promptly increases to comprise the CoA of MS and the binding record of HoA on HA.

Step 104: grouping data conversation carries out, and the communication data between MS and the opposite end is transmitted by HA, particularly, sends to the data of opposite end for MS, is default router with PDSN, utilizes reverse tunnel to mail to HA, and HA gives the opposite end with data forwarding; Mail to the data of MS for the opposite end, at first be routed to HA, HA utilizes forward tunnel that data are mail to PDSN according to the CoA in the address binding record, and PDSN mails to MS with data.

Step 105: after grouping data conversation finishes, discharge PDSN and be connected with R-P between the RAN, and the Traffic Channel between RAN and the MS.

Then, carry out the address cancel of mobile IP when MS returns home network, promptly deletion comprises the CoA of this MS and the binding record of HoA on HA.

In step 104, if MS strides RAN and moves, be that MS roams in the zone of target RAN from source RAN, and the PDSN difference that source RAN is connected with target RAN, then need the PDSN that strides that carries out grouping data conversation to switch, be that current service PDSN switches to target P DSN from source PDSN, concrete switching flow comprises following steps as shown in Figure 2:

Step 1041: grouping data conversation is undertaken by source PDSN, and this moment, the CoA of MS was that source PDSN is the address of MS IP address allocated or source PDSN self, and the HoA of MS is its home network IP address allocated.

Step 1042: when needs are striden the PDSN switching, set up target RAN to R-P connection between the target P DSN and the Traffic Channel between MS and the target RAN.

Step 1043: set up PPP session new between MS and the target P DSN, this moment, the CoA of MS was updated to the address that target P DSN is MS IP address allocated or target P DSN self, and the HoA of MS remains unchanged.

Step 1044:MS carries out the address registration process of mobile IP, is default router with target P DSN, increases to comprise the CoA of MS and the binding record of HoA on HA.

Step 1045: grouping data conversation continues, because the HoA of MS does not change, therefore the opposite end of communicating by letter with MS can utilize the HoA of MS to continue to communicate by letter with MS, has kept professional continuity.

Step 1046: source of release RAN is connected with R-P between the PDSN of source.

So far, finished the switching of this grouping data conversation from source PDSN to target P DSN, target P DSN is current service PDSN.

From above flow process as can be seen, in the existing mobile IPv 4, carry out the address registration of mobile IP by MS, i.e. address binding is carried out the address cancel of mobile IP when MS returns home network, promptly remove address binding.Therefore as seen, stride PDSN when switching at grouping data conversation, utilizing mobile IP technology to keep professional successional prerequisite is that portable terminal must be supported mobile IP, but present most of portable terminal is not supported mobile IP, for the portable terminal of not supporting mobile IP, can only pass through simple IP mode access network.The simple IP mode is similar to the mode that landline telephone dials up on the telephone by modulator-demodulator (Modem).Under the simple IP mode, it is dynamically changeable that PDSN gives the portable terminal IP address allocated at every turn, therefore the simple IP mode can realize the packet data call of portable terminal as caller, agreement is simple, realize easily, but need interrupt ongoing grouping data conversation when striding the PDSN switching, professional continuity can not get guaranteeing.

Under the simple IP mode, if system's support is switched fast, can keep professional continuity by quick switching, promptly when striding the PDSN switching, carry out forwarding of data by layer two tunnel between two PDSN, make the PPP end points maintain former service PDSN and do not change access point, thereby keep professional continuity.But, if system does not support quick switching, when striding the PDSN switching, its ongoing grouping data conversation just can't continue, this will use Packet data service to cause certain inconvenience to mobile terminal user, and reduce the satisfaction of user for Packet data service.

Summary of the invention

Main purpose of the present invention is to provide a kind of method that realizes grouping data conversation, make no matter whether MS support mobile IP technology, can guarantee when striding the PDSN switching, to keep the continuity of Packet data service, grouping data conversation is proceeded.

The objective of the invention is to be achieved through the following technical solutions:

A kind of method that realizes grouping data conversation may further comprise the steps:

A, when portable terminal initiation packet data session, set up the Traffic Channel between portable terminal and the service wireless access network RAN, and serving RAN is connected with R-P between the service packet data serving node PDSN;

Point-to-point protocol PPP session between B, foundation service PDSN and the portable terminal, service PDSN determines the home address and the Care-of Address of portable terminal, and, in the grouping data conversation process, keep the home address of portable terminal constant by serving PDSN to the binding of home agent initiation to the home address and the Care-of Address of determined portable terminal;

After C, grouping data conversation finish, remove binding to the home address and the Care-of Address of determined portable terminal, discharge serving RAN with serve that R-P between the PDSN is connected and portable terminal and serving RAN between Traffic Channel.

According to an aspect of the present invention, the home address and the Care-of Address of the described definite portable terminal of step B comprise: service PDSN keeps the home address of the original IP of portable terminal address as portable terminal, and will serve the Care-of Address of PDSN its own IP address as portable terminal.

According to a further aspect in the invention, this method further comprises: the address realm of home agent place network is divided into an above address subclass, is acted on behalf of the address assignment of an address subclass by an above PDSN of network respectively;

The home address and the Care-of Address of the described definite portable terminal of step B comprise: service PDSN selects the home address of an IP address as portable terminal from its agency's address subclass, lock this address then and no longer distribute to other portable terminals, and will serve the Care-of Address of PDSN its own IP address as portable terminal;

After grouping data conversation finishes, further comprise: service PDSN discharges the locking to this locked address.

Wherein, described service PDSN release comprises the locking of this locked address: home agent indication service PDSN discharges the locking to this locked address.

Wherein, after the described service of the step B PDSN lock address, further comprise: on service PDSN, start the locking timer;

The locking that described service PDSN discharges this locked address comprises: service PDSN discharges the locking to this locked address automatically behind described locking timer expiry.

Wherein, the described service of step B PDSN initiates the home address of determined portable terminal and the binding of Care-of Address are comprised to the township agency:

Service PDSN binds the home address and the Care-of Address of determined portable terminal to the home agent request; Home agent is searched its binding record of preserving, the binding record that judges whether to exist the home address of asking to bind to be complementary with service PDSN, if exist, the binding record that then will find replaces with the home address that comprises service PDSN request binding and the binding record of Care-of Address; Otherwise increase comprises the home address of service PDSN request binding and the binding record of Care-of Address.

Wherein, in step C, service PDSN request home agent is removed the binding to the home address and the Care-of Address of portable terminal.

Wherein, the described service of step B PDSN further comprises: start the binding timer on home agent after home agent is initiated binding to the home address of portable terminal and Care-of Address;

In step C, home agent automatically terminates the binding to the home address and the Care-of Address of portable terminal behind described binding timer expiry.

Wherein, the described releasing of step C comprises the home address of determined portable terminal and the binding of Care-of Address: home agent is searched its binding record of preserving, the binding record that judges whether to exist home address and Care-of Address with portable terminal to be complementary, if exist, then delete the binding record that finds; Otherwise do not delete any binding record.

Described home agent is the overall home agent of network, or the subregional local home agent of Network Dept..

First embodiment according to the invention, between step B and step C, in the process of grouping data conversation, if portable terminal moves to target RAN institute compass of competency from serving RAN institute compass of competency, and when serving RAN is connected different PDSN with target RAN, further comprise:

Set up that target RAN is connected with R-P between the target P DSN and target RAN and portable terminal between Traffic Channel;

Set up the PPP session between target P DSN and the portable terminal, target P DSN and target RAN replace former service PDSN respectively and former serving RAN becomes current service PDSN and serving RAN, current service PDSN determines the home address and the Care-of Address of portable terminal, and initiates binding to the home address and the Care-of Address of determined portable terminal by current service PDSN to home agent;

Discharging former service PDSN is connected with R-P between the former serving RAN.

According to a second embodiment of the present invention, between step B and step C, in the grouping data conversation process, if portable terminal moves to target RAN institute compass of competency from serving RAN institute compass of competency, and when serving RAN is connected different PDSN with target RAN, further comprise:

Set up target P DSN and be connected with the P-P that serves between the PDSN, service PDSN sends grouped data by target P DSN to portable terminal;

Discharging service PDSN is connected with R-P between the serving RAN;

Discharging current service PDSN is connected with P-P between the former service PDSN.

A third embodiment in accordance with the invention, between step B and step C, in the grouping data conversation process, if portable terminal moves to target RAN institute compass of competency from serving RAN institute compass of competency, and when serving RAN is connected different PDSN with target RAN, further comprise:

Set up target P DSN and be connected with the P-P that serves between the PDSN, service PDSN transmits the PPP session context to target P DSN, and sends grouped data by target P DSN to portable terminal;

Discharging service PDSN is connected with R-P between the serving RAN.

Target P DSN activates the PPP context that receives, target P DSN and target RAN replace former service PDSN respectively and former serving RAN becomes current service PDSN and serving RAN, current service PDSN determines the home address and the Care-of Address of portable terminal, and initiates binding to the home address and the Care-of Address of determined portable terminal by current service PDSN to home agent;

In above three embodiment, further comprise: the address realm of home agent place network is divided into an above address subclass, acts on behalf of the address assignment of an address subclass by an above PDSN of home agent place network respectively;

Wherein, at described portable terminal after serving RAN institute compass of competency moves to target RAN institute compass of competency, described current service PDSN determines that the home address of portable terminal and Care-of Address comprise: current service PDSN keeps the home address of portable terminal constant, with the Care-of Address of current service PDSN its own IP address as portable terminal.

Wherein, at described portable terminal after serving RAN institute compass of competency moves to target RAN institute compass of competency, constant the comprising of home address that described current service PDSN keeps portable terminal: current service PDSN obtains the home address of the determined portable terminal of former service PDSN, then with the home address of this address as portable terminal.

Wherein, the described current service PDSN home address that obtains the determined portable terminal of former service PDSN comprises: the negotiation phase that current service PDSN sets up in the PPP session obtains the home address of the determined portable terminal of former service PDSN from portable terminal.

Wherein, the home address that described current service PDSN obtains the determined portable terminal of former service PDSN comprises: former serving RAN is with the current service PDSN of IP address notification of former service PDSN, and current service PDSN is to the home address of the determined portable terminal of former service PDSN request former service PDSN.

Wherein, between current service PDSN and former service PDSN, set up under the situation that P-P is connected, the home address that described current service PDSN obtains the determined portable terminal of former service PDSN comprises: current service PDSN connects the home address that obtains the determined portable terminal of former service PDSN from former service PDSN by P-P, and the home address of described portable terminal can transmit or be included in former service PDSN separately and pass in the PPP session context of current service PDSN.

Wherein,, after initiating binding to the home address of portable terminal and current service PDSN its own IP address, home agent further comprises at current service PDSN: removes the home address of the portable terminal that the former PDSN of service binds and the IP address of former service PDSN on home agent.

Wherein, the home address of the portable terminal that the former service of described releasing PDSN binds on home agent and the IP address of former service PDSN comprise: home agent is searched its binding record of preserving, the binding record that judges whether to exist the IP address with the home address of portable terminal and former service PDSN to be complementary, if exist, then delete the binding record that finds; Otherwise do not delete any binding record.

After the step C, further comprise:

Portable terminal returns after its home network, initiates to remove binding to the home address and the Care-of Address of portable terminal by the PDSN of home network to home agent.

From technique scheme as can be seen, in the method for realization grouping data conversation of the present invention, initiate address registration to the HoA and the CoA of portable terminal by the PDSN of current service; In the mobile IP scenario of prior art, by the address registration of portable terminal initiation to its HoA and CoA.Therefore, method of the present invention can avoid because the problem that the grouping data conversation that portable terminal is not supported mobile IP and caused interrupts when portable terminal is mobile in network, guarantees that its ongoing business is unlikely to interrupt.

And, in a preferred embodiment of the present invention, when striding the PDSN switching, setting up interim P-P between former service PDSN and current service PDSN is connected, before rebuilding the PPP session, former service PDSN mails to the data of portable terminal by current service PDSN, reduce since reconstruction PPP session to time-delay that business data transmission caused.

And, in another preferred embodiment of the present invention, after setting up interim P-P between former service PDSN and the current service PDSN and being connected, former service PDSN gives current service PDSN with the PPP context transfer, current service PDSN activates the PPP session according to the contextual state of the PPP that obtains, and need not to rebuild new PPP session, thereby further reduced the time-delay of business data transmission

Because in above-mentioned two preferred embodiments, it is interim that former service PDSN is connected with P-P between the current service PDSN, exists in handoff procedure, and this P-P interface just is released after switching, so has not only saved resource, has also alleviated the burden of PDSN.

Description of drawings

Fig. 1 does not have when adopting mobile IP technology to realize grouping data conversation to stride the flow chart that PDSN switches.

Fig. 2 strides the flow chart that PDSN switches when adopting mobile IP technology to realize grouping data conversation.

Fig. 3 is the basic flow sheet of realization grouping data conversation of the present invention.

Fig. 4 is the schematic diagram of address structure between HA of the present invention and PDSN.

Fig. 5 is the flow chart of the realization grouping data conversation of PDSN agent address distribution of the present invention.

Fig. 6 be the embodiment of the invention one when realizing grouping data conversation, stride PDSN switching flow figure.

Fig. 7 be the embodiment of the invention two when realizing grouping data conversation, stride PDSN switching flow figure.

Fig. 8 be the embodiment of the invention three when realizing grouping data conversation, stride PDSN switching flow figure.

Embodiment

In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.

Method of the present invention has been utilized the thought of existing mobile IP technology, different is, in the scheme of existing mobile IP technology, initiate address registration by portable terminal to HA, and in the solution of the present invention, act on behalf of portable terminal by PDSN and initiate address registration to HA, therefore, even portable terminal is not supported mobile IP, adopt method of the present invention also can keep the continuity of Packet data service.

Fig. 3 is the basic flow sheet of realization grouping data conversation of the present invention.In basic procedure shown in Figure 3, do not comprise and stride the situation that PDSN switches, PDSN shown in Figure 3 is current service PDSN.As can be seen from Figure 3, this basic procedure comprises following steps:

Step 301:MS initiation packet data session is set up the Traffic Channel between MS and the RAN, and RAN is connected with R-P between the PDSN.

Step 302: set up the PPP session between PDSN and the MS, PDSN is HoA with the original address of MS, and with the address of PDSN self CoA as MS.

Step 303:PDSN registers at HA by mobile IP login request message (RRQ), HoA and the CoA of binding MS, detailed process is: HA checks the binding record earlier, if there is no with the binding record of MS matching addresses, then increases the binding record that comprises MS address and PDSN address; If the binding record of existence and MS matching addresses then is updated to former record the binding record that comprises MS address and PDSN address.

Step 304: grouping data conversation carries out, and MS communicates by letter with the opposite end.Detailed process is: the data that mail to MS at first are routed to HA, HA checks the binding record, if there is the binding record, then according to pairing PDSN address, MS address in the binding record, by forward tunnel data are sent to PDSN, PDSN sends the data to corresponding M S after removing outer layer address; The data that MS sends at first arrive PDSN, directly send to the opposite end according to the address, opposite end by route then, and PDSN also can be sent to HA with data by reverse tunnel according to local policy, is transmitted to the opposite end by HA.

Step 305: when grouping data conversation finishes, PDSN carries out address cancel by RRQ request HA, detailed process is: HA checks the binding record, if there is the binding record that all mates with MS address and PDSN address, then delete this binding record, if there is no any binding record then do not deleted in the binding record that all mates with MS address and PDSN address.

Undertaken also having another kind of mode of carrying out address cancel, promptly overtime cancellation mode the mode of address cancel except above by PDSN request HA, its detailed process is: after address registration, HA starts one and nullifies timer, after nullifying timer expiry, automatically performs address cancel by HA.

Need explanation, when grouping data conversation finishes, also can not carry out address cancel immediately, after MS initiates another grouping data conversation, if MS still is in the accesses network, substitute original binding record with producing new binding record, after MS returns its home network, by the PDSN initiation address cancel of home network.

Step 306: discharge RAN and be connected with R-P between the PDSN, and the Traffic Channel between RAN and the MS.

HA described in the method for the present invention can be overall HA, also can be local HA.If described HA is overall HA, the HoA of MS distributes (above-mentioned flow process is not shown) unitedly in the network range of overall HA place; If described HA is local HA, the HoA of MS can distribute unitedly, is distributed by service PDSN in the time of also can be by the initiation packet data session, the grouping data conversation that this HoA is corresponding specific, and only exist in conversation procedure, in case conversation end, this HoA promptly is released.

Carry out in the mode of address assignment at PDSN, the address realm of HA place network comprises the address realm of each PDSN agency in the network.For example, each PDSN agency's address realm is a subclass of HA place network address range.HA knows each PDSN agency's address realm and the corresponding relation between each PDSN, that is to say, HA can navigate to the PDSN that distributes this address by specific address.The address of PDSN self can be within its agency's address realm, and the PDSN number in the set network address range can be determined according to actual conditions.Fig. 4 is the schematic diagram of address structure between HA of the present invention and PDSN, has schematically shown the relation between the address realm of place network of HA and each PDSN agency's the address realm.As shown in Figure 4, the address realm of HA place network is divided into subclass 1 to subclass n, PDSN1 to PDSNn acts on behalf of the address assignment of subclass 1 to the address realm of subclass n respectively.PDSN agency's address realm can distribute by static configuration, also can pass through DHCP (DHCP, Dynamic Host Configuration Protocol) and distribute.

By the address assignment in the PDSN agency network address realm, not only can make portable terminal in conversation procedure, in network range, keep its home address constant when mobile, thereby keep the continuous of business, and under the situation that has overall HA and local HA, do not need frequently to overall HA register update binding information.The network range of supposing overall HA place covers the whole nation, the network range at one local HA place covers Beijing, portable terminal is when Beijing scope interior span PDSN moves so, need not when each the switching to overall HA registration binding information, but only get final product to local HA registration binding information, can simplify Signalling exchange like this.

Fig. 5 is the basic flow sheet of the realization grouping data conversation of PDSN agent address distribution of the present invention.In basic procedure shown in Figure 5, do not comprise and stride the situation that PDSN switches, shown PDSN is current service PDSN.HA shown in Figure 5 is local HA.As can be seen from Figure 5, the basic procedure of the realization grouping data conversation of PDSN agent address distribution comprises following steps:

Step 501 is identical with step 301.

Step 502: set up the PPP session between PDSN and the MS, PDSN is that MS distributes HoA, for example select the HoA of an address as MS from the address realm of its agency's subnet, lock this address then to avoid distributing to other MS, the address of PDSN self is as the CoA of MS.

Step 503 to 505 with step 303 to 305 identical.

Step 506: after the address cancel success, HA distributes the PDSN of this address to discharge the address that locks when the PPP session is set up according to the MS address notification, so far removes the locking to this address, can redistribute this address and give other MS.For example, HA sends address to this PDSN then and discharges request (Address_Release_Req) message according to the definite PDSN that distributes this address in MS address, and its major parameter is the MS address; After this PDSN has discharged the address of this MS, discharge response (Address_Release_Res) message to the HA return address.

Undertaken also having the another kind of mode that the address discharges, the promptly overtime delivery mode of carrying out the mode that the address discharges except above by HA indication PDSN, its detailed process is: after the locking of address, PDSN starts a release timer, after release timer is overtime, automatically performs the address by PDSN and discharges.

Step 507 is identical with step 306.

Above Fig. 3 and flow process shown in Figure 5 are the basic procedures that the present invention realizes grouping data conversation, the difference of two flow processs is that the HoA of MS in the flow process shown in Figure 3 distributes unitedly in the scope of overall HA place network, and in flow process shown in Figure 5, distribute when the MS initiation packet data session and lock the HoA of an address by PDSN, discharge this address behind the conversation end as MS.

Though more than two flow processs do not relate to and stride PDSN and switch, but because the mode that adopts PDSN to carry out address registration and cancellation, and the HoA of portable terminal is no change in the grouping data conversation process, so no matter whether portable terminal supports mobile IP, when striding the PDSN switching, all can guarantee the continuity of Packet data service.The process of striding the PDSN switching in the time of will realizing grouping data conversation to the present invention by three specific embodiments below is described in detail.Need to prove, below in three specific embodiments, all be that to carry out address assignment with PDSN be example.Should be appreciated that the present invention is not limited to and adopts PDSN to carry out address assignment.

Embodiment one:

Fig. 6 strides the flow chart that PDSN switches when being the realization grouping data conversation of the embodiment of the invention one.In the present embodiment, current service PDSN switches to target P DSN from source PDSN.As can be seen from Figure 6, the flow process of present embodiment roughly comprises following steps:

Step 601: grouping data conversation is undertaken by source PDSN, and this moment, source PDSN distributed the address to MS as described in step 502.

Step 602: stride PDSN when switching at needs, set up target RAN and be connected with R-P between the target P DSN, and the Traffic Channel between target P DSN and the MS.

Step 603: set up the PPP session between MS and the target P DSN, target P DSN obtains the HoA of MS, if determine that this address is within the address realm of HA place network, then accept this address, with the HoA of this address continuation, rather than from its agency's subnet, select the address to redistribute to MS as MS.This moment, current service PDSN switched to target P DSN from source PDSN.

Target P DSN can obtain the HoA of MS in several ways, and for example: MS uses HoA to hold consultation at ipcp phase and target P DSN; By expansion R-P interface, by the address of Packet Control Function (PCF, Packet Control Function) the entity notification target PDSN source PDSN of source RAN, target P DSN is to the HoA of source PDSN request MS then.

Step 604: target P DSN carries out address registration to HA request, and HA checks the binding record, if there is no with the binding record of MS matching addresses, then increases the binding record that comprises MS address and target P DSN address; If the binding record of existence and MS matching addresses then is updated to former record the binding record that comprises MS address and target P DSN address.

Step 605: grouping data conversation carries out, and MS communicates by target P DSN and opposite end.Detailed process is: the data that mail to MS at first are routed to HA, HA checks the binding record, if there is the binding record, then according to pairing target P DSN address, MS address in the binding record, by forward tunnel data are sent to target P DSN, target P DSN sends the data to corresponding M S after removing outer layer address; The data that MS sends at first arrive target P DSN, directly send to the opposite end by route then according to the address, opposite end, target P DSN also can be sent to HA with data by reverse tunnel according to local policy, be transmitted to the opposite end by HA, if the address, opposite end is just in the address realm of HA place network, target P DSN need be dealt into HA earlier with data, is mail to the physical location of opposite end again according to the address binding record by HA.

Step 606: source PDSN discharges it and is connected with R-P between the RAN of source, and nullifies to the HA request address, and HA checks the binding record, if there is the binding record that all mates with MS address and PDSN address, source, then deletes this binding record; If there is no any binding record then do not deleted in the binding record that all mates with MS address and PDSN address, source.

Execute above-mentioned flow process, the whole process of striding the PDSN switching finishes.

Embodiment two:

In the present embodiment, network support is switched fast, in striding the PDSN handoff procedure, connects the transmission data by interim P-P so, reduces the PPP session and rebuilds the time-delay that causes.

Fig. 7 is that the grouping data conversation when supporting to switch fast of embodiment two is striden the flow chart that PDSN switches.In the present embodiment, current service PDSN switches to target P DSN from source PDSN.From Fig. 7 as seen, present embodiment roughly comprises following steps:

Step 701: grouping data conversation is undertaken by source PDSN, and this moment, source PDSN distributed the address to MS as described in step 502.

Step 702: stride PDSN when switching at needs, set up target RAN and be connected with R-P between the target P DSN, and the Traffic Channel between target RAN and the MS.

Step 703: set up target P DSN and connect to the P-P between the PDSN of source.

Step 704: grouping data conversation is proceeded, and source PDSN is connecting when source RAN sends data by original R-P, also connects to target P DSN by P-P to send data, and target P DSN transmits data to target RAN, and DSN is sent to MS with data by target P.

Step 705: source of release PDSN is connected with R-P between the RAN of source, and source PDSN can only connect by P-P and forward the data to target P DSN this moment, by target P DSN data was sent to MS then.

Step 706: when MS was idle, new PPP session was set up in for example MS dormancy or need consult PPP again the time between MS and the target P DSN, and target P DSN obtains the HoA of MS, and with the HoA of this address continuation as MS.This moment, current service PDSN switched to target P DSN from source PDSN.

Step 707: target P DSN initiates address registration to HA, the address of binding MS address and target P DSN on HA.Detailed process is identical with step 604, and after this HA can not be transmitted to the grouped data that mails to MS source PDSN, but directly by target P DSN data is mail to MS.

Step 708: discharge target P DSN and be connected, also can nullify to the address binding of source PDSN on HA with P-P between the PDSN of source.

From the above mentioned, when network support is switched fast, can between source PDSN and target P DSN, set up interim P-P and be connected, switch in the process carry out striding PDSN, connect the transmission data by this interim P-P, stride PDSN switch finish after, this interim P-P connects and is released.Like this, both can reduce the PPP session and rebuild influence, and can save resource again and alleviate the burden of PDSN transfer of data.

Embodiment three:

Present embodiment and embodiment two are basic identical, difference only is: embodiment two has rebuild the PPP session, and in the present embodiment, the roughly the same characteristics of PPP session parameter of carrying same Packet data service have been utilized, by between source PDSN and target P DSN, shifting the PPP context, to avoid rebuilding the PPP session.

Fig. 8 is the flow chart of striding the PDSN switching when supporting to switch fast in the conversation procedure of embodiment three.In the present embodiment, current service PDSN switches to target P DSN by source PDSN.From Fig. 8 as seen, present embodiment roughly comprises following steps:

Step 801 to 802 respectively with step 701 to 702 identical.

Step 803: set up target P DSN and be connected with P-P between the PDSN of source, source PDSN will comprise such as the PPP context transfer of qos parameter, MS address etc. and give target P DSN.When shifting the PPP context, can use the message format of the P-P interface of standard, also can use the form of the context transfer message of RFC4067 definition.

Step 804 to 805 respectively with step 704 to 705 identical.

Step 806: target P DSN activates the PPP context, and according to qos parameter data is handled.In the process that activates the PPP session, target P DSN temporary cache MS data that send and that mail to MS.This moment, current service PDSN switched to target P DSN from source PDSN.

Step 807: identical with step 707.

Step 808 is identical with step 708.

Need to prove, in the process of PPP context transfer, the HoA of MS can be included in the PPP contextual information, pass to target P DSN from source PDSN; Also the HoA of MS can be connected separately by P-P and transmit.

From the above mentioned, in the present embodiment,, promptly need not from the beginning to carry out ppp negotiation, therefore can further accelerate handoff procedure, reduce time delay of data transmission owing to avoid rebuliding the PPP session.

Need to prove that if HA of the present invention is local HA, so, the PDSN switching of striding of above-described several embodiment refers to that all the PDSN that strides in the network range of local HA place switches.Surmounted the network range at local HA place if stride the PDSN switching, be that target P DSN is not within the network range at local HA place, the HoA that distributes in the network range of local HA place further can be bound as the HoA that CoA and overall HA distribute so, to realize further dividing layer-two mobility.

The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.

Claims

1, a kind of method that realizes grouping data conversation is characterized in that, comprising:

2, method according to claim 1, it is characterized in that, the home address and the Care-of Address of the described definite portable terminal of step B comprise: service PDSN keeps the home address of the original IP of portable terminal address as portable terminal, and will serve the Care-of Address of PDSN its own IP address as portable terminal.

3, method according to claim 1 is characterized in that, further comprises: the address realm of home agent place network is divided into an above address subclass, is acted on behalf of the address assignment of an address subclass by an above PDSN of network respectively;

4, method according to claim 3 is characterized in that, the locking that described service PDSN discharges this locked address comprises: home agent indication service PDSN discharges the locking to this locked address.

5, method according to claim 3 is characterized in that, after the described service of the step B PDSN lock address, further comprises: start the locking timer on service PDSN;

6, method according to claim 1 is characterized in that, the described service of step B PDSN initiates the home address of determined portable terminal and the binding of Care-of Address are comprised to the township agency:

7, method according to claim 1 is characterized in that, in step C, service PDSN request home agent is removed the binding to the home address and the Care-of Address of portable terminal.

8, method according to claim 1 is characterized in that, the described service of step B PDSN further comprises: start the binding timer on home agent after home agent is initiated binding to the home address of portable terminal and Care-of Address;

9, method according to claim 1, it is characterized in that, the described releasing of step C comprises the home address of determined portable terminal and the binding of Care-of Address: home agent is searched its binding record of preserving, the binding record that judges whether to exist home address and Care-of Address with portable terminal to be complementary, if exist, then delete the binding record that finds; Otherwise do not delete any binding record.

10, method according to claim 1 is characterized in that, home agent is the overall home agent of network, or the subregional local home agent of Network Dept..

11, method according to claim 1 is characterized in that, between step B and step C, in the process of grouping data conversation, if portable terminal moves to target RAN institute compass of competency from serving RAN institute compass of competency, and serving RAN further comprises when being connected different PDSN with target RAN:

12, method according to claim 1 is characterized in that, between step B and step C, in the grouping data conversation process, if portable terminal moves to target RAN institute compass of competency from serving RAN institute compass of competency, and serving RAN further comprises when being connected different PDSN with target RAN:

Discharging service PDSN is connected with R-P between the serving RAN;

13, method according to claim 1 is characterized in that, between step B and step C, in the grouping data conversation process, if portable terminal moves to target RAN institute compass of competency from serving RAN institute compass of competency, and serving RAN further comprises when being connected different PDSN with target RAN:

Discharging service PDSN is connected with R-P between the serving RAN.

14, according to claim 11,12 or 13 described methods, it is characterized in that, further comprise: the address realm of home agent place network is divided into an above address subclass, acts on behalf of the address assignment of an address subclass by an above PDSN of home agent place network respectively;

15, method according to claim 14, it is characterized in that, at described portable terminal after serving RAN institute compass of competency moves to target RAN institute compass of competency, described current service PDSN determines that the home address of portable terminal and Care-of Address comprise: current service PDSN keeps the home address of portable terminal constant, with the Care-of Address of current service PDSN its own IP address as portable terminal.

16, method according to claim 15, it is characterized in that, at described portable terminal after serving RAN institute compass of competency moves to target RAN institute compass of competency, constant the comprising of home address that described current service PDSN keeps portable terminal: current service PDSN obtains the home address of the determined portable terminal of former service PDSN, then with the home address of this address as portable terminal.

17, method according to claim 16, it is characterized in that the home address that described current service PDSN obtains the determined portable terminal of former service PDSN comprises: the negotiation phase that current service PDSN sets up in the PPP session obtains the home address of the determined portable terminal of former service PDSN from portable terminal.

18, method according to claim 16, it is characterized in that, the home address that described current service PDSN obtains the determined portable terminal of former service PDSN comprises: former serving RAN is with the current service PDSN of IP address notification of former service PDSN, and current service PDSN is to the home address of the determined portable terminal of former service PDSN request former service PDSN.

19, method according to claim 16, it is characterized in that, between current service PDSN and former service PDSN, set up under the situation that P-P is connected, the home address that described current service PDSN obtains the determined portable terminal of former service PDSN comprises: current service PDSN connects the home address that obtains the determined portable terminal of former service PDSN from former service PDSN by P-P, and the home address of described portable terminal can transmit or be included in former service PDSN separately and pass in the PPP session context of current service PDSN.

20, method according to claim 15, it is characterized in that,, after initiating binding to the home address of portable terminal and current service PDSN its own IP address, home agent further comprises at current service PDSN: removes the home address of the portable terminal that the former PDSN of service binds and the IP address of former service PDSN on home agent.

21, method according to claim 20, it is characterized in that, the home address of the portable terminal that the former service of described releasing PDSN binds on home agent and the IP address of former service PDSN comprise: home agent is searched its binding record of preserving, the binding record that judges whether to exist the IP address with the home address of portable terminal and former service PDSN to be complementary, if exist, then delete the binding record that finds; Otherwise do not delete any binding record.

22, method according to claim 1 is characterized in that, after the step C, further comprises: