CN101128013A - A switching method for access gateway in mobile communication system - Google Patents
A switching method for access gateway in mobile communication system Download PDFInfo
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- CN101128013A CN101128013A CNA2006100621040A CN200610062104A CN101128013A CN 101128013 A CN101128013 A CN 101128013A CN A2006100621040 A CNA2006100621040 A CN A2006100621040A CN 200610062104 A CN200610062104 A CN 200610062104A CN 101128013 A CN101128013 A CN 101128013A
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Abstract
The utility model discloses a switchover method for the access gateway of a mobile communication system. The core comprises that during the switchover of the access gateway, the ID of the IP flow belonging to the packet is added when the processed forward link packet of a mobile terminal is sent to a target access gateway by a source access gateway through a GRE tunnel; the packet corresponding to the IP stream is sent to a piece of equipment of the target access network in a correct A10 according to the stream mapping information instructed by the equipment of the target access network after the target access gateway receives the packet provided with the ID of the IP stream processed by the source access gateway. The utility model enables the target access gateway to identify the IP stream correctly; in addition, the GRE tunnel can be set up between the source access gateway and the target access gateway in order to save the energy when the context information still remaining in the source access gateway but not arrival at the target access gateway.
Description
Technical field
The present invention relates to the changing method in the mobile communication system, relate in particular to the method for switching access gateway in the mobile communication communication system.
Background technology
Existing C DMA2000 system, comprise CDMA 1x 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.
Existing C DMA2000 network packet domain structure is as shown in Figure 1:
In Wireless IP network, when occurring between the wireless access network (RAN, Radio Access Network) that connects identical PDSN when switching, the service PDSN before and after switching is same PDSN, so this switching is called as, and PDSN is interior to be switched; 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 between PDSN and switches.For switching in the PDSN,, can keep professional continuity so only need to carry out link switchover owing to do not change the IP access point.For switching between PDSN, access point changes, and can't keep professional continuity this moment by simple link switchover, and need otherwise keep professional continuity.
In CDMA 1x system, if system's support is switched fast, move to another PDSN scope when causing switching between PDSN in terminal, 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, the address that can keep terminal is constant, thereby keeps professional continuity.
But, if the PPP end points maintains source PDSN and does not change, can cause during the alive packet session, the A10 connection is connected with point-to-point (P-P) simultaneously and exists, thereby increased the burden of source PDSN, consumed the processing resource of source PDSN and the link circuit resource between PDSN.So between the PDSN of HRPD network in the handoff procedure, the session state transfer of the source PDSN target P DSN after switch can be gone up, make the Network Access Point of portable terminal become target P DSN.
HRPD switches frame of reference as shown in Figure 2 fast:
HA is the home agent among the mobile IP among the figure.S-PDSN is source PDSN, the service PDSN before promptly switching, and T-PDSN is target P DSN.S-AN is the source access network equipment, and T-AN is a target access network equipment.
HRPD switching fast is made of three parts: P-P tunnel, context transfer and proxy-mobile IP.Wherein P-P tunneling process and context transfer process can executed in parallel, and the proxy-mobile IP process is carried out after context transfer.After switching was finished fast, T-PDSN became service PDSN.
The P-P interface is used for will transmitting between PDSN after the user data tunnel encapsulation in fast handover procedures.Terminal will be transferred to target access network at the session status of source access gateway after carrying out the context transfer process, and target access gateway becomes the end points of data session, when using PPP as data link layer, and the end points of PPP just.After the transfer, the signaling between IAD and the terminal will be handled by the target access gateway after switching.The session status of MS comprises ppp state, mobility status, QoS and charging state etc.
Proxy-mobile IP is that IAD PDSN replaces terminal to register binding with mobile IP signaling to HA.Be used for upgrading the route of HA to IAD PDSN.
3GPP2 (Third Generation Partnership Project 2) normal structure is being carried out the research of network evolution items in order to guarantee the competitiveness of its system in future at present, and the main problem of paying close attention to is the Long Term Evolution problem of IP packet network.Its main purpose strengthens packet switched capabilities exactly, simplifies network configuration, improves QoS, reduces time delay, improves user data rate, improves power system capacity and coverage rate, minimizing operation cost etc., make packet network after the evolution that the carrying to real time business and non-real-time service can more effectively be provided, for the user provides abundant more business.
The demand of evolution Network Based, the basic evolvement network framework of proposition, as shown in Figure 3:
Wherein, CAP is Controlling Access Point (a control access point), has the function of IAD and RRM.The major function of IAD is first hop router as MS, and mobile management, QoS support, bear the function of the former PDSN of part.And RRM comprises public resource management, private resource management, wireless session management, the session status of safeguarding MS, Radio Link Management etc.NMA is Network mobility agent (network mobility agency), and L3 between the CAP (layer three) is provided mobility management mechanism, does not need the mobile IP signaling of eating dishes without rice or wine.
Terminal is when access network, and the address that obtains by CAP is effective in the scope of whole NMA, and CAP registers binding with the address of MS and the address of CAP itself at NMA, so that data can correct route.
So when carrying out switching between the CAP, do not need to change the address.
So when between evolvement network CAP, switching, need use tunnel between CAP, context transfer and proxy-mobile IP process equally.
Tunnel between IAD (PDSN of HRPD or the CAP of evolvement network are IADs) is GRE (Generic Routing Encapsulation generic route encapsulation) tunnel, and GRE is a kind of tunneling.The form of GRE wrapper is as shown in Figure 4:
Delivery Header is the packet header of host-host protocol, and Payload Packet is the data that need encapsulation, divides into groups as IP.GRE Header is the GRE head.
By the GRE encapsulation, a kind of data of agreement are transmitted at the network of another kind of agreement.
The form of the GRE head of use is as shown in Figure 5 in the 3GPP2 tissue:
GRE flag (mark) is positioned at two bytes, and wherein the 13rd to 15 is used for version, and the 4th to 12 reservation is necessary for 0.
The 0th C represents that whether the Checksum field exists, and is necessary for 0 in the mark.
The 1st R represents that whether routing field exists, and is necessary for 0.
The 2nd K represents that whether the Key field exists, and is necessary for 1.
The 3rd S represents whether Sequence Number field exists.
Protocol Type (protocol type) 2 bytes are represented the protocol type of packed load.8881H represents the non-structure byte stream, and 88D2H represents it is the 3GPP2 grouping.Only when comprising the Attribute field, protocol type just is made as 88D2H.
Sequence Number (sequence number) 4 bytes can be used for setting up order from wrapper to recipient's transmitted in packets by the recipient.
Attribute (attribute), when protocol type was 88D2H, expression was the 3GPP2 grouping, comprises one or more attribute field.
User Traffic (customer service), the data of expression encapsulation.
Wherein the form of attribute field is as shown in Figure 6:
E (stopping): this is made as 1 last attribute of representing in the attribute list at this moment.
Type (type): the type of representation attribute.
Length (length): the byte number of expression Value field.
Value (value): comprise the attribute information specific.
Be example with HRPD below, the switching flow of IAD in the prior art is described.HRPD can have two kinds of switch modes, and a kind of is context transfer pattern immediately, as shown in Figure 7:
A.MS is connected to network, authenticates and obtain the IP address.Source PDSN carries out the proxy-mobile IP process, and the address of MS address and source PDSN is bound.
B.MS initiates to use and be in active state.
C. source AN determines MS to be switched to target AN.Carry out the switching flow between AN, comprise that the HRPD session information of PDSN address, source is transferred to target AN.
D. target AN confirms that source PDSN is unreachable, selects a target P DSN and sends the pre-established A10 link of A11-reg-request.The address and the IP that comprise source PDSN in the information flow the map information of ID to A10.
E. target P DSN sends HO_Request message to source PDSN, and comprises the context ID of request transmission, connects at each A10 simultaneously and carries the GRE key (key) that is used for P-P tunnel between PDSN.In this message, also carry the map information that the IP that receives from target AN flows to A10.
F. source PDSN responds HO_Response message.The contextual information that comprises request in this message wherein comprises the more employed key informations of proxy-mobile IP.Source PDSN sends the GRE key that is used for tunnel between PDSN in this response message.After this step, the gre tunneling between PDSN is set up.Target P DSN rebuilds the session of MS according to the contextual information of receiving.
G. the PDSN grouping that will handle by gre tunneling in source is sent to target P DSN.After having transmitted, the grouping of handling begins to transmit the undressed IP grouping of receiving.Target P DSN handles untreated IP grouping according to the contextual information of receiving, forward packet is mapped to A10 sends to target AN.Target P DSN begins to carry out billing function.
H.MS switches to target AN, after target P DSN obtains the contextual information of source PDSN transmission and the MS of based on contextual information reconstruction session, target P DSN carries out the proxy-mobile IP process according to the mobility context of receiving, the address of MS and the address of oneself are bound.
I.HA switches to target P DSN with mobile IP tunnel from source PDSN after handling proxy-mobile IP message.The grouping of through source PDSN coming of tunnel a period of time that HA can continue to remain into source PDSN to receive that MS sends.
J. source AN sends A11-Registration-Request to service PDSN, and instruct MS has been left the area of coverage of source AN, and source of release AN connects to the A10 of source PDSN simultaneously.
K. because timer expiry or target P DSN initiate message release, the P-P tunnel is deleted.MS does not know the change of PDSN.Target P DSN becomes service PDSN to be handled grouping.
The switching flow of another IAD is source PDSN when receiving HO_Request message that target P DSN sends and request transmission context, and source PDSN can delay time contextual information is passed to target P DSN.Then fast switching flow is as shown in Figure 8:
A.MS is connected to network, authenticates and obtain the IP address.Source PDSN carries out the proxy-mobile IP process, and the address of MS address and source PDSN is bound.
B.MS initiates to use and be in active state.
C. source AN determines MS to be switched to target AN.Carry out the switching flow between AN, comprise that the HRPD session information of PDSN address, source is transferred to target AN.
D. target AN confirms that source PDSN is unreachable, selects a target P DSN and sends the pre-established A10 link of A11-reg-request.The address and the IP that comprise source PDSN in the information flow the map information of ID to A10.
E. target P DSN sends HO_Request message to source PDSN, and comprises the context ID of request transmission, connects at each A10 simultaneously and carries the GRE key (key) that is used for P-P tunnel between PDSN.In this message, also carry the map information that the IP that receives from target AN flows to A10.
F. source PDSN responds HO_Response message.This message does not comprise the contextual information of request, wherein comprises the more employed key informations of proxy-mobile IP.Source PDSN sends the GRE key of each A10 of correspondence that is used for tunnel between PDSN in this response message.
G. be connected for every A10 of target P DSN and target AN and all set up a gre tunneling.After target AN caught MS, at forward direction, source PDSN proceeded packet transaction, and sent to target P DSN according to the P-P gre tunneling of IP stream map information by correspondence.Target P DSN sends to source PDSN by the reverse packet that A10 sends at the P-P of correspondence gre tunneling with target AN.
H. at certain time point, after application finished in real time as certain, PDSN decision in source was transferred to target P DSN with contextual information.Source PDSN sends HO_Update message to target P DSN, comprises the contextual information of request.Target P DSN installs hereinafter.The P-P tunnel that is grouped in mapping that source PDSN will handle sends.Grouping and untreated grouping that target P DSN comes differentiating and processing to cross according to the GRE protocol type.At forward direction, target P DSN issues target AN with the A10 that is grouped in P-P tunnel correspondence that source PDSN handled.Oppositely, target P DSN is with buffered packet, up to the context installation.Source PDSN begins to send undressed grouping to target P DSN on main gre tunneling after sending all groupings of handling.Oppositely, target P DSN handles the back to grouping and sends to source PDSN by main gre tunneling.
I. target P DSN sends HO-Update Ack to source PDSN, acknowledges receipt of contextual information, and will carry out context and install.
J. target P DSN carries out the proxy-mobile IP process according to the mobility context of receiving, the address of MS and the address of oneself are bound.
K.HA switches to target P DSN with mobile IP tunnel from source PDSN after handling proxy-mobile IP message.The grouping of through source PDSN coming of tunnel a period of time that HA can continue to remain into source PDSN to receive that MS sends.
L. source AN sends A11-Registration-Request to service PDSN, and instruct MS has been left the area of coverage of source AN, and source of release AN connects to the A10 of source PDSN simultaneously.Discharge because timer expiry or target P DSN initiate message, the P-P tunnel is deleted.MS does not know the change of PDSN.Target P DSN becomes service PDSN to be handled grouping.
The context transfer process is to be used for the context state of terminal is moved to target access gateway from source access gateway.Can accelerate switching processing and optimize signaling by context transfer, rebuild necessary context state at target access gateway.Context transfer can be carried out in any moment after source access gateway is received HO_Request, in the time of can being deferred to the dormancy of target access gateway notification source IAD terminal at the latest till.Carrying out the context transfer process is decided by source access gateway.
Target access gateway can comprise the IP that receives from target AN and flow the map information of ID to A10 in message to source access gateway transmission handoff request the time, also promptly carry which IP stream on every A10.At every A10, can comprise a GRE key in the message, be used for distinguishing the data of different A10 connections and different terminals.When the source access gateway decision sends contextual information, if target access gateway given in source access gateway decision delayed delivery context, can create a gre tunneling to every A10.After source access gateway sends to target access gateway with contextual information, between source access gateway and target access gateway, will only safeguard a gre tunneling.If source access gateway sends contextual information immediately after receiving the handoff request of target access gateway, then only create a gre tunneling between source access gateway and target access gateway.
When many gre tunnelings, IP is grouped in source access gateway and handles, and source access gateway sends according to the gre tunneling of stream map information in correspondence, and target access gateway is dealt into target AN according to the corresponding A10 that is grouped in that GRE key will handle.And after target access gateway has been installed contextual information, source access gateway can send to target access gateway with untreated initial IP grouping, the flow filter information that the TFT (traffic flow template) of target access gateway in can based on contextual information comprises, which IP stream the identification grouping belongs to, and the stream map information according to target AN sends in corresponding A 10 then.
In the prior art, after contextual information sends to target access gateway from source access gateway, after can sending the forward packet of having handled, source access gateway begins to send undressed forward direction initial IP grouping at gre tunneling, when having only a gre tunneling between PDSN, handled be grouped in above when sending target access gateway to, because the IP grouping may be compressed and encrypt, target access gateway can't be discerned and belong to which IP stream, the A10 in correspondence that then can't be correct sends packets to target AN, correct IP stream can't be sent to the terminal use thereby influenced target AN.In addition in context message not when source access gateway sends to target access gateway, need to set up many gre tunnelings between source access gateway and the target access gateway, wasted resource.
Summary of the invention
The purpose of this invention is to provide the method for switching access gateway in a kind of mobile communication system,, not only can make target access gateway correctly discern IP stream, and can save resource by the present invention.
In order to achieve the above object, method for switching access gateway provided by the invention comprises:
A, target access gateway send handoff request to source access gateway;
B, described source access gateway response handoff request, by tunnel between IAD (can be gre tunneling or other tunnel, in the HRPD system is gre tunneling) send extremely described target access gateway of the grouped data handled, and in described grouped data, be with the IP traffic identifier;
C, described target access gateway receive the treated grouping of the subsidiary IP traffic identifier of described source access gateway transmission.
Wherein, in the described method for switching access gateway, steps A also comprises:
Comprise the indication of forward packet being used the IP traffic identifier in the described handoff request.
Wherein, in the described method for switching access gateway, step B also comprises:
Described source access gateway and target access gateway are set up gre tunneling, and described gre tunneling can be one or more of.
Wherein, in the described method for switching access gateway, step B also comprises:
Described source access gateway can send to described target access gateway with contextual information when the response handoff request, also can postpone by other signaling contextual information to be sent to described target access gateway again after a period of time.
Wherein, in the described method for switching access gateway, step B also comprises:
Before or after sending described contextual information, the subsidiary IP traffic identifier of going up of the forward packet that described source access gateway will have been handled sends to described target access gateway by gre tunneling.
Wherein, in the described method for switching access gateway, step B also comprises:
Described IP traffic identifier carries in the attribute field of GRE grouping.
Wherein, in the described method for switching access gateway, also comprise:
The attribute field form of described IP traffic identifier comprises: the type item is set to 3, and sign is an IP stream recognition property; The length item is set to 2 byte lengths; Stream ID item comprises IP stream ID; Keep item and put 0.
Wherein, in the described method for switching access gateway, step B also comprises:
Described source access gateway response handoff request sends undressed grouped data to described target access gateway by gre tunneling between IAD.
Wherein, in the described method for switching access gateway, step C also comprises:
Described target access gateway is according to the stream mapping message of IP traffic identifier and target AN indication, and the grouped data of the subsidiary IP traffic identifier that will receive from described source access gateway is dealt into target AN at correct A10.
As seen from the above technical solution provided by the invention, the subsidiary IP traffic identifier of going up of the grouping that source access gateway will have been handled among the present invention sends target access gateway to by a gre tunneling, target access gateway just can correctly be discerned grouping according to the IP traffic identifier and belong to which IP stream, send packet data to target AN by correct A10 then, send to terminal by target AN again, thus the IP stream recognition efficiency when improving IAD and switching.On the other hand,, can when not being sent to target access gateway, can only build a gre tunneling between source access gateway and target access gateway, thereby save resource at contextual information still at source access gateway by the present invention.
Description of drawings
Fig. 1 is existing CDMA2000 network packet domain structure figure;
Fig. 2 is the existing quick switching architecture schematic diagram of HRPD IAD;
Fig. 3 is existing evolvement network IAD switching architecture schematic diagram;
Fig. 4 is the schematic diagram of existing GRE tunneling form;
Fig. 5 is the form schematic diagram of GRE head among the existing 3GPP2;
Fig. 6 is the form schematic diagram of attribute field in the existing GRE head;
Fig. 7 is the flow chart of the existing quick switching type one of HRPD;
Fig. 8 is the flow chart of the existing quick switching type two of HRPD;
Fig. 9 is the form schematic diagram of IP traffic identifier attribute field among the present invention;
Figure 10 is the flow chart of first embodiment provided by the invention;
Figure 11 is the flow chart of second embodiment provided by the invention.
Embodiment
Basic thought of the present invention is as follows:
When carrying out switching between IAD, target access gateway can be indicated and also can be indicated source access gateway when sending the forward packet of MS by gre tunneling, with going up the affiliated IP traffic identifier of grouping.The packet filter information that TFT in the source access gateway based on contextual information (traffic flow template) comprises (ID that the stream correspondence of address and port-mark is arranged in the packet filter), IP stream under the identification grouping is as determining the IP traffic identifier by the information such as upper-layer protocol, address and port of IP grouping.When the forward packet that will handle by gre tunneling of source access gateway sends to target access gateway then, in GRE packet header, be with the IP traffic identifier.Target access gateway is according to after receiving the grouping that the source access gateway that has the IP traffic identifier was handled, and according to the stream map information that target AN indicates, the correct A10 that is grouped in that corresponding IP is flowed is dealt into target AN.
Even have only a gre tunneling like this between source access gateway and the target access gateway, target access gateway also can flow the correct A10 that is grouped in that ID handled source access gateway according to IP and send to target AN.
The inventive method comprises the steps:
(1) carry out switching between IAD, target access gateway sends handoff request to source access gateway, can indicate in the message forward packet is used the IP traffic identifier.
Source access gateway can be with the IP traffic identifier according to request in each GRE grouping when sending the grouping of handling by gre tunneling between IAD.
Can be not in the handoff request yet with the indication of using the IP traffic identifier, source access gateway always in each GRE grouping with under the IP traffic identifier.
(2) source access gateway response handoff request.Source access gateway and target access gateway are set up gre tunneling after this step, and gre tunneling can be one or more of.
Source access gateway can send to target access gateway with contextual information when the response handoff request, perhaps postponing by other signaling contextual information to be sent to target access gateway again after a period of time.No matter be to send context or delayed delivery context immediately, the gre tunneling between source access gateway and the target access gateway can only be built one.Also can corresponding target access gateway be connected and build many gre tunnelings with every A10 between target AN.
(3) source access gateway is with the IP traffic identifier in the GRE grouping when sending treated forward packet to target access gateway.
The IP traffic identifier carries in the attribute field of the GRE of 3GPP2 regulation grouping.The attribute field form of IP traffic identifier is as shown in Figure 9:
Type: be made as 3, sign is IP stream identification (IP Flow Discriminator) attribute.
Length: length is 2 bytes
Flow ID: comprise IP stream ID.
Reserved: keep, put 0.
In fast switching scene, no matter be before sending contextual information or after, the forward packet that corresponding source access gateway had been handled, source access gateway can be in the GRE grouping with on the IP traffic identifier send to target access gateway by the gre tunneling between IAD.
Target access gateway is installed hereinafter the undressed initial IP that the success back just can the process source IAD sends and has been divided into groups.
(3) target access gateway divides into groups to the treated GRE that source access gateway sends, and can correctly discern to belong to which IP stream.
Target access gateway according to the grouping in the IP traffic identifier just can carry out respective handling.Can be in switching fast according to the stream map information of IP traffic identifier and target AN indication, the correct A10 that is grouped in that corresponding IP is flowed is dealt into target AN.
IAD is PDSN in the HRPD network, and IAD is CAP in the evolvement network, and for the switching between the IAD in CDMA evolvement network or other mobile communication system, if relate to tunneling process between IAD, this invention is suitable for too.
Tunnel between corresponding IAD is not the GRE protocol encapsulation, and when being to use other agreements, also can be on the tunneling that uses subsidiary IP traffic identifier to reach purpose of the present invention.
Be example with the quick handoff technique of HRPD below, provide two embodiment of the present invention at two kinds of switching types, further method of the present invention is elaborated:
First embodiment is a context transfer pattern immediately when IAD switches fast among the HRPD, its flow process as shown in figure 10:
A, MS are connected to network, authenticate and obtain the IP address.Source PDSN carries out the proxy-mobile IP process, and the address of MS address and source PDSN is bound.
B, MS initiate to use and be in active state.
C, source AN determine MS to be switched to target AN.Carry out the switching flow between AN, comprise that the HRPD session information with PDSN address, source is transferred to target AN.
D, target AN confirm that source PDSN is unreachable, select a target P DSN and send the pre-established A10 link of A11-reg-request.The address and the IP that comprise source PDSN in the information flow the map information of ID to A10.
E, target P DSN send HO_Request message to source PDSN, and comprise context ID of asking transmission and the GRE key (key) that is used for P-P tunnel between PDSN.In this message, go back the indication of portability use IP traffic identifier.
F, source PDSN response HO_Response message.The contextual information that comprises request in this message wherein comprises the more employed key informations of proxy-mobile IP.Source PDSN sends the GRE key that is used for tunnel between PDSN in this response message.After this step, set up a gre tunneling between PDSN.Target P DSN can rebuild the session of MS according to the contextual information of receiving.
The grouping that g, source PDSN will handle by gre tunneling is sent to target P DSN, carries IP stream ID in the GRE packet attributes, and target P DSN will be grouped in corresponding A10 and issue according to the stream map information of IP stream ID that carries and target AN indication.Source PDSN begins to transmit the undressed IP grouping of receiving after the grouping of handling has transmitted, need not carry IP stream ID.Target P DSN handles untreated IP grouping according to the contextual information of receiving, forward packet is mapped to A10 sends to target AN.Target P DSN begins to carry out billing function.
After h, target P DSN obtained the contextual information of source PDSN transmission and the MS of based on contextual information reconstruction session, target P DSN carried out the proxy-mobile IP process according to the mobility context of receiving, the address of MS and the address of oneself are bound.
I, HA switch to target P DSN with mobile IP tunnel from source PDSN after handling proxy-mobile IP message.The grouping of through source PDSN coming of tunnel a period of time that HA can continue to remain into source PDSN to receive that MS sends.
J, source AN send A11-Registration-Request to service PDSN, and instruct MS has been left the area of coverage of source AN, and source of release AN connects to the A10 of source PDSN simultaneously.
K, because timer expiry or target P DSN initiate message discharges, the P-P tunnel is deleted.MS does not know the change of PDSN.Target P DSN becomes service PDSN to be handled grouping.
When second embodiment switches fast for IAD among the HRPD, the pattern of time-delay context transfer, its flow process as shown in figure 11:
A, MS are connected to network, authenticate and obtain the IP address.Source PDSN carries out the proxy-mobile IP process, and the address of MS address and source PDSN is bound.
B, MS initiate to use and be in active state.
C, source AN determine MS to be switched to target AN.Carry out the switching flow between AN, comprise that the HRPD session information of PDSN address, source is transferred to target AN.
D, target AN confirm that source PDSN is unreachable, select a target P DSN and send the pre-established A10 link of A11-reg-request.The address and the IP that comprise source PDSN in the information flow the map information of ID to A10.
E, target P DSN send HO_Request message to source PDSN, and comprise the context ID of request transmission, carry the GRE key (key) that is used for P-P tunnel between PDSN simultaneously.In this message, go back the indication of portability use IP traffic identifier.
F, source PDSN response HO_Response message.This message does not comprise the contextual information of request, wherein comprises the more employed key informations of proxy-mobile IP.Source PDSN sends the GRE key that is used for tunnel between PDSN in this response message.
Can only set up a gre tunneling between g, source PDSN and target P DSN.After target AN caught MS, at forward direction, source PDSN proceeded packet transaction, and carried IP stream ID send to target P DSN by gre tunneling in GRE grouping, and target P DSN can send in corresponding A 10 according to the stream map information of target AN indication.Target P DSN sends to source PDSN by the reverse packet that A10 sends at the gre tunneling of correspondence with target AN.
H, at certain time point, as certain use in real time finish after, PDSN decision in source is transferred to target P DSN with contextual information.Source PDSN sends HO_Update message to target P DSN, comprises the contextual information of request.Target P DSN installs hereinafter.The gre tunneling that is grouped in that source PDSN will handle sends, and carries IP stream ID.Grouping and untreated grouping that target P DSN comes differentiating and processing to cross according to the GRE protocol type.At forward direction, target P DSN issues target AN with the A10 of the correspondence that is grouped in target AN indication that source PDSN handled.Oppositely, target P DSN is with buffered packet, up to the context installation.Source PDSN begins to send undressed grouping to target P DSN on main gre tunneling after sending all groupings of handling.Oppositely, target P DSN handles the back to grouping and sends to source PDSN by gre tunneling.
Source PDSN just sends to target P DSN with contextual information after can postponing till terminal sleeping always, then only transmits contextual information among the step h, does not relate to the processing to grouping.
I, target P DSN send HO-Update Ack to source PDSN, acknowledge receipt of contextual information, and will carry out context and install.
J, target P DSN carry out the proxy-mobile IP process according to the mobility context of receiving, the address of MS and the address of oneself are bound.
K, HA switch to target P DSN with mobile IP tunnel from source PDSN after handling proxy-mobile IP message.The grouping of through source PDSN coming of tunnel a period of time that HA can continue to remain into source PDSN to receive that MS sends.
L, source AN send A11-Registration-Request to service PDSN, and instruct MS has been left the area of coverage of source AN, and source of release AN connects to the A10 of source PDSN simultaneously.Discharge because timer expiry or target P DSN initiate message, the P-P tunnel is deleted.MS does not know the change of PDSN.Target P DSN becomes service PDSN to be handled grouping.
The above; only be two kinds of better embodiment of the present invention, but protection scope of the present invention do not limit to therewith, anyly be familiar with those skilled in the art in technical scope disclosed by the 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 claim.
Claims (10)
1. the method for switching access gateway in the mobile communication system is characterized in that, comprising:
A, target access gateway send handoff request to source access gateway;
B, described source access gateway response handoff request sends extremely described target access gateway of the grouped data handled by tunnel between IAD, and be with the IP traffic identifier in described grouped data;
C, described target access gateway receive the treated grouping of the subsidiary IP traffic identifier of described source access gateway transmission.
2. method for switching access gateway as claimed in claim 1 is characterized in that: the tunnel between described IAD is a gre tunneling.
3. method for switching access gateway as claimed in claim 1 is characterized in that, described A step comprises:
Comprise the indication of forward packet being used the IP traffic identifier in the described handoff request.
4. as claim 2 or 3 described method for switching access gateway, it is characterized in that described B step comprises:
Described source access gateway and target access gateway are set up gre tunneling, and described gre tunneling can be one or more of.
5. method for switching access gateway as claimed in claim 4 is characterized in that, described step B also comprises:
Described source access gateway can send to described target access gateway with contextual information when the response handoff request, also can postpone by other signaling contextual information to be sent to described target access gateway again after a period of time.
6. method for switching access gateway as claimed in claim 5 is characterized in that, described step B also comprises:
Before or after sending described contextual information, the subsidiary IP traffic identifier of going up of the forward packet that described source access gateway will have been handled sends to described target access gateway by gre tunneling.
7. method for switching access gateway as claimed in claim 2 is characterized in that, the traffic identifier of IP described in the step B carries in the attribute field of GRE grouping.
8. the method for switching access gateway described in claim 7 is characterized in that, the attribute field form of described IP traffic identifier comprises:
The type item is set to 3, and sign is an IP stream recognition property; The length item is set to 2 byte lengths; Stream ID item comprises IP stream ID; Keep item and put 0.
9. the method for switching access gateway described in claim 8 is characterized in that, step B also comprises:
Described source access gateway response handoff request sends undressed grouped data to described target access gateway by tunnel between IAD.
10. method for switching access gateway as claimed in claim 1 is characterized in that step C also comprises:
Described target access gateway is according to the stream mapping message of IP traffic identifier and target AN indication, and the grouped data of the subsidiary IP traffic identifier that will receive from described source access gateway is dealt into target AN at correct A10.
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| CNA2006100621040A CN101128013A (en) | 2006-08-14 | 2006-08-14 | A switching method for access gateway in mobile communication system |
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| CNA2006100621040A CN101128013A (en) | 2006-08-14 | 2006-08-14 | A switching method for access gateway in mobile communication system |
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