CN101208930A

CN101208930A - Mobility support for multihome nodes

Info

Publication number: CN101208930A
Application number: CNA2006800228401A
Authority: CN
Inventors: W·哈达德
Original assignee: Telefonaktiebolaget LM Ericsson AB
Current assignee: Telefonaktiebolaget LM Ericsson AB
Priority date: 2005-04-22
Filing date: 2006-04-20
Publication date: 2008-06-25
Also published as: CN101208931B; CN101208931A

Abstract

A method, a correspondent node and a mobile node are provided for allowing setup of a session between the mobile node and the correspondent node using a new unique indicator in lieu of the home address to enable the correspondent node to uniquely identify the mobile node. The correspondent node uses the new unique indicator to identify the session within its Binding Cache Entry table.The mobile node may change its selection of a home address without impacting its ongoing session. Change of a home address may occur when the mobile node selects a new home agent to serve an ongoing session, or when the mobile node selects a new access interface during an ongoing session.

Description

The mobility support of multihome nodes

Technical field

The present invention relates to be used to support method, mobile node and the communication node of many hosts (multihoming).

Background technology

The mobile IP v 6 (MIPv6) of these 4 (mobile IPv 4, mobile IP, MIPv4, or MIP) of hierarchical mobile IP and current version is fabricated and is used to main frame or mobile node (MN) that mobility is provided.Other node that is commonly referred to communication node (CN) 120 is considered as fixed host computer usually.With reference now to accompanying drawing,, wherein Fig. 1 shows the MIPv6 network architecture that the current MIPv6 standard that occurs is advised in the request note (RFC) of the Internet engineering duty group (IETF) numbers 3775.As can be seen from Figure 1, IP network 100 comprises MN110, and MN110 communicates by letter with CN120 by the link that direct path 122 is provided.Direct path 122 may not only be connected to form by a direct physical, but is illustrated in a series of links between the routing device, and this link obviously can be implemented in the communication between them.As long as IP between them communication can be set up, the mode that is used for communicating the series of links of transmission between MN110 and CN120 is inessential.

MN110 has the local address of effectively permanent appointment in its local network (home network) 127, and this local address is assigned with when MN110 is initialized in this local network 127.Distribution mechanism is well known in the prior art.MN110 also communicates by letter with the local agent that is arranged in local network 127 (HA) 130.Except other function, HA130 preserve MN110 outside local network 127 effectively outside the record of way address.Way address is called as Care-of Address (CoA) in the environment China and foreign countries of MIPv6.When MN110 when a network moves to another network, the CoA that is assigned to MN110 is along with variation.Be called binding in the environment that is recorded in MIPv6 that HA130 preserves, it is tied to local address with CoA.In order to arrive MN110, comprise that the local address of mobile node and the banding cache list item (BCE) of CoA also preserve in CN120.HA130 also is responsible for and will gives MN110 in traffic carrying capacity (traffic) route that local address receives.HA120 gives MN110 by link 125 with the traffic forwarding that receives.According to MIPv6, all traffic carrying capacitys that send on link 125 are encrypted, with the confidentiality of the certificate (credential) that especially guarantees periodical exchange between MN110 and HA130.

Summarized below in MIPv6 notion in typical case and how to have used.For example, MN110 carries out two-way IP with CN120 and communicates by letter on direct path 122.When MN110 moves to another network from first network, shown in arrow among Fig. 1 135, MN110 receives new CoA.This change of the addressed state of MN110 must be notified to CN120 and HA130.In order to notify the change of its CoA, MN110 sends first Binding Updates (BU) by link 125 and gives HA130, and this Binding Update is encrypted, comprise the CoA that newly obtains with the relevant out of Memory of the binding that is used for MN110 in HA130.HA130 upgrades binding subsequently, and binds first binding acknowledgement (BA) that successfully upgrades with indication and reply MN110.MN110 creates the 2nd BU that is similar to a BU after sending a BU, and by direct path 122 the 2nd BU is sent to CN120.CN120 creates BCE when receiving the 2nd BU, and creates the 2nd BA subsequently and send to MN110.Receive the notice that the 2nd BA represents to complete successfully described change at MN110.

" Cryptographically Based Identifiers (CBID): Concepts andApplications ", ACM Transaction on Information and System Security (TISSEC), in February, 2004, described how to be mobile node calculating unforeseen identifier (CBID) based on password.CBID is unique on statistics and is can verify on the password.As be known in the art, can use public keys (K+) and other parameter of MN110 to produce CBID.Therefore, because CN120 knows the K+ of MN110, it can verify or authenticate this CBID.

Many hosts allow mobile node to dispose simultaneously and use a plurality of IP address.Move and to have a plurality of interfaces that are associated with different link-locals with many hosts' node (MMN).In fact, this means a plurality of prefixes of announcement on link-local.For instance, MMN can provide its HA service by a plurality of Internet service provider (ISP) access the Internet and each ISP.Such feature request MN110 can manage its pool of static/dynamic addresses.When MN110 have by with MN110 the identical HA definition of attached HA or by different HA definition, in the time of perhaps with a plurality of prefix that identical HA or different HA are associated, many hosts sight takes place, perhaps have a plurality ofly when itself can be attached to the interface of one or more HA again as MN110, many hosts sight takes place.With the actual common sight of many hosts and mobility characteristics combination is to be attached to a MN110 with a plurality of interfaces that different HA are associated.Under such sight, MN110 may be in certain session redirection of just carrying out of naming a person for a particular job to another interface, perhaps uses interface exchange data packets as backup and on another interface.An example is to have two distinct interfaces that two kinds of different access technologies are provided that are attached to mobile device.Interface can be that CDMA2000 interface and another interface of being connected to operator are the wireless lan (wlan) interfaces, and it can provide connective in public WLAN hot-zone (hotspot).In such sight, when MN110 under the hot-zone covers, it can set up real-time session by the WLAN interface that is attached to field network, for example sets up the IP phone session.In this case, if MN110 passes the border, hot-zone, this session re-routes data packets to the CDMA2000 interface ideally.

Another sight is to have two different HA, and each HA is attached to an interface.In such sight, to require MN110 to utilize two addresses and the HoA that disposes on second interface upgrades CN120 carrying out the transfer just carrying out session between two HA, described two addresses are CoA, as shift it may change or also may not change as a result.

The MIPv6 agreement is not described in detail in how MN110 benefits in the mobile environment from many hosts feature.According to MIPv6, MN110 must use static HoA to set up session.The sole mode of CN120 location BCE in its BCE table is the entrained HoA of search BU.If HoA is received the BU that carries new CoA, then CN120 can find relevant BCE and upgrade the CoA value.But if mobile node changes to new HoA, then CN120 can not locate relevant BCE and will be this HoA and the corresponding new BCE of CoA establishment.As a result, if mobile node switches to new HoA, then ongoing session all can not continue.In addition, because the architectural principles of MIPv6, the session between MN and the CN identifies with the IP address (being HoA here) of MN, the IP address of CN, the port numbers of MN, the port numbers of CN and the host-host protocol between them.Any variation that is used for the parameter of session identification will be abolished this session.

It obviously is favourable that the method, mobile node and the communication node that are used for providing the HoA that is independent of mobile node to create the ability of BCE to communication node are provided.This continues ongoing session when making mobile node to change between local ip address.

Summary of the invention

Therefore, main purpose of the present invention provides allow to use new, unique designator to set up method, mobile node and the communication node of session between mobile node and communication node, and wherein said new, unique designator makes that communication node can this mobile node of unique identification.The variation of the selection of local address does not influence any ongoing session.

A first aspect of the present invention is the method that is used for setting up session at a kind of between mobile node of being served by service local agent (servinghome agent) and communication node.Local agent is the node in the local network, and wherein mobile node has reservation (subscription).Local address by the definition of the service local agent of local network is at first selected by mobile node.If mobile node is currently located in the local network, then the local address of this selection is preferably communicated by letter with communication node.Yet if mobile node is roamed in accessed network, the Care-of Address of visited network is preferably as routing address.Calculate privately owned identifier at mobile node.Mobile node sends to communication node and sets up message (establishment message).This is set up message and comprises privately owned identifier and preferred address.In response to setting up message, communication node is created the list item that comprises privately owned identifier and preferred address.

A second aspect of the present invention is to select one method at a kind of being used at a plurality of local addresss that are assigned to mobile node.Mobile node with a plurality of local addresss is mobile multihome nodes.These a plurality of local addresss can define in single local agent, perhaps define in different local agents.Selected local address is by the local agent definition of the current sessions of also serving mobile node.If by the local agent definition that is currently serviced in this session, then in these addresses that define by the current service local agent, select the local address of the preferred access interface of support mobile node more than one local address.

A third aspect of the present invention is at a kind of more method of the address of the list item of new communications nodes that is used for.Mobile node is provided with new address, and this new address is used as the backup of preferred address or is used to replace preferred address.If mobile node plans to use new address under the situation that does not successfully arrive preferred address, then mobile node adds backup mark (indication).If mobile node goes round and obtained new Care-of Address, if perhaps it turns back to the territory of local network from field network, then mobile node adds mobile mark.New address and (if setting) backup mark or mobile mark send to communication node in renewal.Communication node is replaced preferred address if perhaps sent mobile mark then passed through with new address by adding new address as backup address, upgrades list item.

A fourth aspect of the present invention is in order to receive the communication node of one or more message with the session of mobile node at a kind of.This communication node is stored the privately owned identifier and the preferred address of this session in list item when receiving first message.When receiving the message subsequently of carrying alternative address, communication node perhaps adds substituting the address as backup address according to the sign that comprises in upgrading subsequently in list item, perhaps rewrite preferred address in list item.

A fifth aspect of the present invention is the mobile node that comprises the mobility unit that is used to select preferred address at a kind of, and this preferred address is one of Care-of Address that is assigned to mobile node (if mobile node is connected to field network) or the local address selected.This mobile node also comprises the computing unit that is used to calculate privately owned identifier, be used to set up with the session of communication node with to communication node and send the session management unit of address information, and is used for the interface of communicating by letter with communication node.Described address information comprises privately owned identifier and preferred home address.

A sixth aspect of the present invention is the mobile multihome nodes that comprises a plurality of local addresss at a kind of.The local address of selecting is based on that current service local agent selects, and, if current service local agent definition mobile node more than one local address, then the selection of local address is based on the preferred access interface of this mobile node.

Description of drawings

In order to understand the present invention and its further purpose and advantage in more detail, the following explanation of reference in conjunction with the accompanying drawings now, wherein:

Fig. 1 is the prior art diagram of the architecture of mobile internet protocol edition 6;

Fig. 2 shows and utilizes the authentication secret key to set up the diagram of the method for session between mobile node and communication node;

Fig. 3 shows and is used to mobile node to specify the preferred routing address and the precedence diagram of the method for new communications nodes more;

Fig. 4 shows and use the precedence diagram of local address as the method for backup address under the situation of link failure;

Fig. 5 shows the precedence diagram of the method that changes preferred routing address;

Fig. 6 shows the flow chart of selecting the method for local address on mobile node;

Fig. 7 shows the precedence diagram that upgrades the method for the local address of selecting on communication node;

Fig. 8 shows the exemplary mobile node that makes up according to the present invention;

Fig. 9 illustrates the exemplary communication node that makes up according to the present invention.

Embodiment

To innovative teachings of the present invention be described with particular reference to the different exemplary use and the aspect of preferred embodiment below.However, it should be understood that this embodiment only provides some examples of many favourable purposes of innovative teachings of the present invention.In general, the statement of in the application's specification, being done needn't limit of the present invention any require patent protection aspect.In addition, some statements may be applicable to some novel features and not be suitable for other novel features.In the description of accompanying drawing, similarly Reference numeral is represented like of the present invention.

The invention provides the local address (HoA) that on CN, is independent of MN and create method, mobile node (MN) and the communication node (CN) of list item for this MN.

Described MN sends to CN with its HoA, but sends new unique identifier to CN, substitutes HoA in the list item so that be stored in.Be used for also being sent to CN, and be stored in the list item from MN to the preferred address of MN route messages.HoA still can send to CN alternatively, as the interpolation field in the message of also carrying described new unique identifier.

MN can support different access technologies, and for example the honeycomb connection is connected with wireless lan (wlan).MN comprises the access interface that is used for every kind of access technology, and each access interface comprises and is used for the HoA that communicates by letter with the local agent (HA) of local network.In addition, MN can preengage more than a local network and thereby be associated more than a HA.This means that a MN can have more than a HoA, thereby become mobile multihome nodes (MMN).Therefore this MN uses a HoA corresponding to selected access interface to set up session with CN, and this HoA defines in a HA, and this HA itself is the part corresponding to the local network of the reservation of the current use of MN.

Under this situation of 6 (MIPv6) of hierarchical mobile IP, if there is not the present invention, when transfer means that will change HoA in the middle of session the time, this agreement is not supported the transfer from a kind of access technology to another kind of access technology.When MN session is ongoing select new HA simultaneously in, MIPv6 does not handle the change of HoA yet.By providing new, unique identifier to identify MN on CN, MN can freely change its HoA.

In environment of the present invention, MN can comprise mobile cellular telephone, personal assistant, kneetop computer etc., and wherein MN comprises at least one access interface and preferably supports MIPv6.

CN can be a server, for example web server or conversation initialized protocol (SIP) server or any computer.CN also can be another MN, and alternatively, it oneself can be another MMN.CN preferably supports MIPv6.

HA can be the database in the part of IP network, and this part is called " local network ", because it provides reservation for MN.HA is by specifying HoA to come to provide reservation for MN to MN.

For the description of giving the preferred embodiments of the present invention provides a basis,, the figure shows and between MN and CN, utilize the authentication secret key to set up the diagram of the method for session with reference now to Fig. 2.MN110 is associated with local network, and local network is the local part (being also referred to as local network 127) of IPv6 network 100.MN110 has at an effective IPv6 address or the HoA of the local part of IPv6 network 100.This HoA also is used for MN110 is associated with the local agent that is positioned at this local network (HA) 130.HA is a node in this local network, and wherein MN110 has reservation in this local network.When in local network, setting up reservation for MN110, HA130 definition HoA and it is distributed to MN110.All traffic carrying capacitys that are addressed to this HoA at first are routed to HA130, and HA130 is transmitted to MN110 with it.

MN110 also has a pair of asymmetric key, comprises private cipher key (K-) and public keys (K+).The concrete function that dual key is encrypted is known in the prior art.Think that naturally all are verifiable to K+ by MN110.Proprietorial confirmation is passable, for example, finishes by using certificate authority, and certificate authority is the proprietorial credible third party that guarantees K+.Do not require and use third-party another kind of solution to be to use the K+ that is used for other encryption mechanism.An example of this mechanism is address (CGA) mechanism that encrypt to produce, and it makes it possible to confirm the ownership with the IPv6 address of its generation equally.

When MN110 moves in the accessed part of IPv6 network 100 (step 200), by the service node of this accessed part will be in this accessed part effective the 2nd IPv6 address or Care-of Address (CoA) offer MN110 (step 222).Except HoA, CoA is set also.This CoA is used for directly arriving MN110.The mode of CoA is known in the art for MN110 is provided with.

The CoA that MN110 need newly obtain it is notified to CN120.This realizes (promptly giving CN120 from the HA130 route) by sending the message 224 of setting up that is addressed to CN120 via HA130 from MN110.This sets up message 224 also can be called pre-Binding Update or PBU.This sets up message 224 these CoA of announcement.Set up HoA and CoA that message comprises MN, and can comprise the K+ of MN.

Receiving when setting up message 224 CoA of CN120 test MN110 and the getatability of HoA.This is to realize by sending first address test 228 that is addressed to HoA from CN120 to MN110.Send second address test 230 that is addressed to CoA from CN120.

Tested 230 o'clock receiving first address test, 228 and second address, MN110 sends single confirmation form (confirmation) 232.Confirmation form 232 uses the K-signature by MN110.Confirmation form 232 also can be called as Binding Update (BU).

Receive the confirmation book 232 at CN120 and just finished test CoA and HoA.

CN120 also sends the affirmation 234 that is addressed to CoA to MN110.Confirm that 234 comprise that the K+ that uses MN110 is at the authentication secret key of confirming to encrypt in 234 (SKbm).SKbm is produced by CN120 probably.Confirm that 234 can also be called as binding acknowledgement (BA).Receiving the confirmation at 234 o'clock, MN110 uses K-deciphering SKbm.After this, in step 236, MN110 and CN120 have identical SKbm and authenticate communication between them.

Can be by in acknowledge message 234, in confirmation form 232 or in any combination of message 224 and 232, sending the K+ that K+ announces MN110.

More than described the conventional method of setting up session between MN and CN, described the demonstration aspect of the preferred embodiments of the present invention referring now to Fig. 3, Fig. 3 shows the precedence diagram that is used to MN110 to specify preferred routing address and upgrades the method for CN120.In step 310, in MN110, specify HoA to be used to set up session with CN120.Following Fig. 6 has described the process as the local address of selecting (SHoA) of specifying among a plurality of HoA.For description of step 310, can suppose that MN110 comprises single HoA, it is interpreted as SHoA automatically.This exemplary case and not meaning that with MN110 of single HoA limits the scope of the invention, but for cheer and bright purpose.

In step 315, determine the current local network 127 that whether is positioned at of MN110.If it in local network, then in step 320, is appointed as preferred address with SHoA, be used for route traffic to MN110.If but MN110 is not positioned at local network 127, then MN110 inserts other places or visited network.This visited network distributes CoA to MN110.Branch pairing those skilled in the art of CoA is known and does not belong to scope of the present invention.The personnel that are familiar with the IP communication technology know the clear CoA that distributes to MN110 of HA of service MN110.Under the situation of MN110 visit field network, CoA is appointed as preferred address in step 325.

Step 330 for MN specifies privately owned identifier.This privately owned identifier is as making CN120 be independent of the mode of described SHoA identification mobile radio station.Privately owned identifier is not the IP address and can not be used for route.Ideally, privately owned identifier is encrypted in the mode that allows authentication MN.This privately owned identifier is preferably based on the identifier (CBID) of password, this identifier is according to the calculating of describing in " CryptographicallyBased Identifiers (CBID): Concepts and Applications " (ACMTransaction on Information and System Security (TISSEC), in February, 2004).In step 335, MN110 is provided for indicating this privately owned identifier can not be used as the private ownership sign of routing address.In step 340, with the privately owned identifier of MN, preferred address with optionally private ownership sign, SHoA, public keys (K+) send to CN120 in setting up message.In the realization environment of MIPv6, set up the form that message adopts PBU.

In step 340, CN120 receives and sets up message.If privately owned identifier is the CBID type, in step 345, CN120 can recomputate CBID to be complementary with the value that receives by utilizing K+ in setting up message, authenticate this and set up message.CN120 is not routable address from the private ownership Mark Detection to this privately owned identifier, thereby the route that can not attempt to test this privately owned identifier.Be not included in the alternate embodiment of setting up in the message at the private ownership sign, CN120 can analyze the form or the value of privately owned identifier, and determines that this is not a routable address.Be not included among another embodiment that sets up in the message at the private ownership sign, CN120 can attempt to use privately owned identifier to send message as routing address, the for example test of the address shown in the step 230 of Fig. 2, detect and do not receive response or receive error message, thereby and determine that this privately owned identifier is not a routable address.

In step 355, CN120 alternatively can be by sending the route that preferred address is tested in the address to MN110 on direct path 122.In the realization environment of MIPv6, the address test is pre-binding test (PBT).Subsequently, in step 360, MN110 responds the address test by send confirmation form to CN120.The content class of confirmation form is similar to the content of setting up message.In the realization environment of MIPv6, confirmation form adopts the form of BU.CN120 can with the described same way as demonstration validation of step 345 book in the CBID (not shown) that comprises.When receiving the confirmation book, if perhaps do not support

step

355 and 360 then receiving when setting up message, in step 370, CN120 is the conversation establishing list item, preferably banding cache list item (BCE).This BCE is comprised in the table among the CN120 for example.According to religious doctrine of the present invention, privately owned identifier is as the pointer of concrete of location in this table.Be usually included in the information that receives in message or the confirmation form of setting up in step 370 for item with the MN110 conversation establishing, promptly privately owned identifier and preferred address, and alternatively, private ownership sign, SHoA and K+.In step 380, CN120 calculates SKbm and in affirmation it is returned to MN110, preferably in BA SKbm is returned to MN110 under the situation of MIPv6.

Used the exemplary method of Fig. 3 to set up session, during session, variety of event may take place.Describe another aspect of the preferred embodiments of the present invention referring now to Fig. 4, Fig. 4 shows and use the precedence diagram of HoA as the method for backup address under the situation of link failure.Step as described herein takes place after the session of having set up as previously mentioned between MN110 and the CN120 usually.In the environment of Fig. 4, MN110 is positioned among visited network or the field network, and preferred address is CoA.In step 410, MN110 determines that its SHoA should be as substituting the address, in order to be used for backup purpose under the situation by 122 communication failures of the direct path between CN120 and the MN110.Replacedly, MN110 can select another address as backup address.In step 420, MN110 is provided with backup mark.In step 430, send to upgrade to CN120 from MN110, this is updated in the form that adopts new BU under the situation of MIPv6, and this renewal comprises privately owned identifier, private ownership sign, backup mark and alternative address.Alternatively, CN120 is to authenticate the privately owned identifier of this renewal with identical mode noted earlier.In step 435, use the privately owned identifier that in renewal, receives to be session location list item at CN120, if CN120 is set to support MIPv6, then this list item is BCE.In step 440, in response to as the backup mark that update content received, CN120 adds in described list item and substitutes the address as backup address.In step 450, the direct path 122 between MN110 and the CN120 breaks down.Thereby this incident is not must be detected immediately by any node in these two nodes or by its control.In step 460, CN120 attempts to use preferred address to send to MN110 about the message of any characteristic of current sessions.In step 470, CN120 receives Reflector.As previously explained, direct path 122 may not only be connected to form by a direct physical, but is illustrated in a series of links between the routing device, and this link obviously can be implemented in the communication between them.Therefore, any one in the described routing device can produce Reflector.Be used to produce that the mode of Reflector is known in the art and outside scope of the present invention.In response to this Reflector, in step 480, CN120 resends the identical message that it sends in step 460 intention, but this time uses backup address.In this exemplary use, described backup address is actually the SHoA of MN110.Thereby in step 480, the HA130 of MN110 receives described message.In step 490, because HA130 has the knowledge of the CoA of MN110, it is transmitted to MN110 by using this CoA with described message and content thereof.

Used the exemplary method of Fig. 3 to set up session, MN110 can change the position during this session.Describe another aspect of the preferred embodiments of the present invention referring now to Fig. 5, Fig. 5 shows the precedence diagram of the method for the described preferred address that upgrades MN110 in the list item of CN120 or BCE.When MN110 changes the position, may need to change preferred address in step 510.MN110 can move among the new field network and obtain new CoA.In this case, in step 520, this CoA becomes alternative address.MN110 can also move away field network, returns its local network.Return under the local situation at MN110, become alternative address at step 520 SHoA.In either case, MN110 is provided with mobile mark in step 530, and this sign shows the result of selected this alternative address as the MN110 change in location.In step 540, MN110 sends renewal, for example new BU, and it comprises privately owned identifier, private ownership sign, mobile mark and alternative address.CN120 receives this renewal, and authenticates this privately owned identifier alternatively.In step 550, CN120 discerns described list item by finding the particular item that comprises the privately owned identifier that receives.In step 560, in response to mobile mark, CN120 utilizes the alternative address that receives to rewrite the preferred address of MN110 in described list item.After this, CN120 uses the new preferred address of storing in this list item to communicate by letter with MN110.

In another aspect of the present invention, mobile can have a plurality of interfaces that are associated with different link-locals with many hosts' node (MMN).The MN110 that uses in the described demonstration methods of Fig. 3 can expand to and become MMN.Fig. 6 shows the flow chart of selecting the method for HoA at MN.The MN110 of Fig. 6 is MMN.This MMN comprises the table that comprises a plurality of HoA.These a plurality of HoA can be defined by an independent HA, or are associated with it.Replacedly, different HoA can perhaps be associated with a plurality of HA by a plurality of HA definition.This table has defined related with an independent HA for each HoA.Described SHoA must be by the HA service that also is the current sessions service of MN.In addition, by selecting the SHoA of a HoA as session, MN selects to define the service HA of this SHoA automatically.

If more than a HoA with current for the HA of conversational services is associated, perhaps by current be the HA definition of conversational services, then need in those HoA, select to support the HoA of the preferred access interface of MN by the HA definition of current service.In order to be that session specifies SHoA, MN110 must consider all HoA of being associated with the service HA of this session in its table.In Fig. 6, this process is described.In step 610, MN110 chooses the HoA in its table.In step 620, MN110 verifies whether a HoA is associated with described service HA.If be associated, then add a HoA to a tabulation as candidate HoA in step 630.No matter whether added a HoA to tabulation, whether step 640 detects this HoA is last HoA in this table.If not, then choose next HoA, and be this next one HoA repeating step 620 in step 650.At last, in step 640, last HoA in this table that found empirical tests.In step 660, verify the quantity of candidate HoA in the described tabulation.Because MN110 can be only by at least one the HA service among its HoA of definition, the quantity of the candidate HoA in the described tabulation of step 660 can not be less than one.If in step 660 is found described tabulation, single candidate HoA is arranged, then this candidate HoA is appointed as the HoA of selection or SHoA in step 670.May find to exist more than a candidate HoA in the described tabulation in step 660.For example, such situation: MN110 can occur and comprise WLAN access interface and CDMA2000 access interface, these interfaces are all served by different HoA by identical HA.In this case, in step 680, MN110 chooses preferred access interface.The selection of this preferred access interface can be based on user's preference, and perhaps the signal strength signal intensity of the signal that receives on two access interfaces is perhaps considered based on other, for example the different usage charges of each access interface.In step 690, MN110 specifies from described tabulation and is used for the SHoA of the candidate HoA of preferred access interface as session.

The described demonstration methods of Fig. 3 can expand to the MMN that supports Fig. 7.Describe a kind of modification of the demonstration methods of Fig. 3 referring now to Fig. 7, wherein MMN is in the session with CN, and Fig. 7 shows the precedence diagram that upgrades the method for SHoA at CN.Step described here takes place after the session of setting up as previously mentioned between MN110 and the CN120 usually, and wherein in fact SHoA sends to CN120 by MN110 and be stored in the list item of session.In step 710, MN110 changes its access interface.This overlay area and the intention that may walk out WLAN the user of for example MN110 continues to take place in the ongoing session.MN110 need use new preferred access interface, for example CDMA2000 interface.In step 720, MN110 is that this new access interface is selected new SHoA.Replacedly, in step 730, MN110 can select new HA.This may take place for example user moves to by second local network of the 2nd HA service from first local network when.The problem that depends on charge may more economical way be by the 2nd HA service for MN, rather than receive the SHoA that CoA still uses first local network simultaneously in second local network.In step 740, the new SHoA that the MN110 selection is associated with the 2nd HA.If MN110 has only a HoA who is associated with the 2nd HA, then select this HoA.If but MN110 has the HoA that is associated with the 2nd HA more than, then can in MN110, the process of application drawing 6 select SHoA.

No matter new SHoA selects in step 720 or step 740, new SHoA is different from any SHoA that had before informed to CN120 in than confirmation form early or renewal early.In step 750, MN110 sends new renewal to CN120.This new renewal comprises privately owned identifier, private ownership sign and new SHoA.In step 760, CN120 is by finding the particular item that comprises this privately owned identifier that newly receives to discern to be used for the list item of this session.In step 770, CN120 comes to upgrade list item for MN110 by utilizing the SHoA that newly receives to rewrite the SHoA value.

Be described in the demonstrative structure of the MN110 that uses among the figure of front referring now to Fig. 8, Fig. 8 shows the exemplary MN110 that makes up according to the present invention.MN110 can realize with the combination in any of hardware, software or hardware and software.MN110 comprises at least one access interface A, and the connection that this interface is used to pass through to local network is communicated by letter with CN and passed through to when leaving local network and communicates by letter being connected with CN of field network.MN110 can also comprise the second access interface B.In exemplary MN110, access interface A can be the CDMA2000 interface, and access interface B can be the WLAN interface.It will be apparent to one skilled in the art that MN110 of the present invention also can support other access interface, comprise, for example, wideband code division multichannel access interface, general pack data service interface, WiMAX interface, EV-D0 interface etc.

MN110 comprises table 810, and table 810 comprises at least one HoA.If MN110 is MMN, then it comprises a plurality of HoA.

Table 810 forms the related mapping of MN110 and one or more HA.Table 810 comprises the identity of one or more HA, and comprises one or more HoA and at least one HA, and for example HA-1 and HA-2's is related.Have at least one HoA for each HA in the table 810, for example HoA1-1 and HoA1-2 that is defined or be associated with HA-1 by HA-1, and HoA2-1 and HoA2-2 are associated by the HA-2 definition or with HA-2.In the exemplary MN110 of Fig. 8, provide two access interfaces, and MN110 comprises a HoA who is used for by two each each access interfaces of being supported of HA.For example, HoA1-1 is by HA-1 definition and use access interface A.Other configuration also is feasible.In simple example more, MN can have single access interface and by the single HoA of a HA definition; Exemplary hereto MN, table 810 can comprise single HA identity and the single HoA related with it.This MN is not a multihome nodes, but still benefits from numerous advantages of the present invention.Another MN can have single access interface, and inserts two HA.The 3rd MN can have two access interfaces and only insert a HA.The 4th MN can have two access interfaces, and each access interface provides one among two HA or another access.

MN110 also comprises session management unit 820, mobility unit 830 and computing unit 850.The session of session management unit control and CN is set up message, renewal and confirmation form and receiver address test and affirmation by the access interface transmission of using in this session.The address is handled for MN110 in mobility unit 830.It comprises the SHoA memory 832 that is used to store selected HoA, the preferred address memory 836 that is used to store the CoA memory 834 of Care-of Address and is used to store the address that is preferred for route.Mobility unit 830 is by determining whether MN110 is connected to the position that local network detects MN110.If visiting field network, then mobility unit 830 obtains CoA in known manner.SHoA is also specified in mobility unit 830.In order to specify SHoA, the element of table 810 is considered in mobility unit 830.If only there is an independent HoA in the table 810, then this HoA is SHoA.If exist in the table 810 more than a HoA, then mobility unit 830 needs identification service HA.One or more HA whether have been defined in the mobility unit 830 consideration tables 810.If table 810 comprises single HA identity, then MN110 is current by this HA service.Otherwise mobility unit 830 is discerned service HA by finding which HA corresponding to ongoing session.In case discerned service HA, if table 810 comprises a HoA by this service HA service, then this HoA is SHoA.If exist more than a HoA by this service HA service, then one of them HoA that is assigned to the preferred access interface of MN110 at this session becomes SHoA.Preferred address is also further selected in mobility unit 830 between this SHoA and CoA, and backup mark and mobile mark are set.Computing unit 850 calculates privately owned identifier 852 and private ownership designator 854 is set.Preferably, computing unit 850 uses the K+ (not shown) of MN110 to calculate the privately owned identifier 852 of CBID form.Exchange is in order to the message of the information of transmission such as SHoA, preferred address, privately owned identifier and various sign between MN110 and CN120, by a transmission among access interface A or the access interface B, in the access interface one according to user interface, the availability of signal and other are considered to select on those access interfaces.

Each of table 810, session management unit 820, mobility management unit 830 and computing unit 850 can realize in many ways, includes, but are not limited to hardware, software, firmware or their combination.

When the session management unit 820 of MN110 is initial when setting up new session with communication node, session management unit 820 is selected an access interface A or access interface B.The selection of access interface is known in the prior art, and outside scope of the present invention.Session management unit 820 can also determine which HA (if MN110 has the reservation more than) is currently serviced in MN110.The selection of service HA, HA-1 or HA-2 are based on the consideration of for example bill or the current location of MN110.Selecting which HA is that the MN service also is known in the prior art.The local address corresponding to the selected HA in selected access interface and the SHoA memory 832 is selected in mobility unit 830.If MN110 comprising outside the local network of serving HA, then mobility unit 830 obtains CoA from field network.This CoA is stored in mobility unit 830 in CoA memory 834.If specified a CoA, mobility unit 830 is selected this CoA subsequently, if perhaps do not specify CoA, then SHoA is selected in mobility unit 830, and it is stored in the preferred address memory 836.Computing unit 850 calculates privately owned identifier and it is stored in the privately owned identifier memory 852.It is storage private ownership designator in private ownership indicator memory 854 also.Session management unit 820 reads the preferred address memory 836 and the SHoA memory 832 of mobility unit 830, and the private ownership indicator memory 854 of computing unit 850 and privately owned identifier memory 852.Session management unit 820 is used the value of preferred address memory 836, privately owned identifier 852 and optional SHoA memory 832 and private ownership indicator memory 854 to make up and is set up message and renewal.Session management unit 820 sends described renewal and sets up message by using the current access interface that is used for session.Session management unit is via the test of access interface receiver address and the affirmation of current use.

During session, if specified new CoA, if perhaps MN110 enters local network from field network, then mobility unit 830 upgrades its preferred address memory 836.If session management unit 820 is selected new service HA or new access interface, then mobility unit 830 upgrades its SHoA memory 832.In either case, as being suitable for, session management unit 820 reads the preferred address memory 836 of renewal of mobility unit 830 or the SHoA memory 832 that upgrades, and starts to send and upgrades to CN.Session management unit 820 can also independently start the renewal of giving CN, and this renewal comprises the value and the backup mark of the SHoA memory 832 that reads from mobility unit 830.

Be described in the demonstrative structure of the CN130 that uses among the figure of front referring now to Fig. 9, Fig. 9 shows the exemplary CN120 that makes up according to the present invention.As known in the art, CN120 can realize with hardware, software or their combination.CN120 comprises input port 910 and output port 920, and input port 910 is used to receive the message such as setting up message, confirmation form, renewal, PBU or BU, and output port 920 is used to send the message such as address test, affirmation, PBT or BA.Depend on the access technology that CN120 uses, input port 910 and output port 920 can form an independent entity.CN120 also comprises and comprises 940 the table 930 and the logical block 960 of (for example can be BCE), and this logical block is used to analyze the content of the message that receives and is used for sending message and managing conversation according to the preferred address of session.For with one of them list item 940 of each conversation establishing that carries out of MN110, minimum privately owned identifier 942 and the preferred address 944 of comprising of each list item.So that handle the data receive in message, logical block 960 whole tables 930 of scanning and search comprise a list item 940 of the privately owned identifier 942 of the privately owned identifier match that receives with a part as message in order to locate one of them list item 940.When not finding coupling, this is first message at new session, and logical block 960 starts the new list item 940 of establishment.

Set up message, confirmation form or renewal and can comprise added field, such as SHoA field, private ownership field and K+ field.If receive those fields, logical block 960 order list items 940 are SHoA948, private ownership sign 946 and public keys 954 with these field store.If receive the K+ field, then logical block 960 can also be calculated SKbm952.

From another message that MN120 receives, for example upgrade, can comprise designator and alternative address such as backup mark or mobile mark.Logical block 960 detects and analyzes such sign.If receive mobile mark as a part of upgrading, then the alternative address rewrite preferred address 944 that provides in this renewal is provided logical block 960 order list items 940.If logical block 960 detects backup mark in renewal, then logical block 960 order list items 940 will substitute the address and be stored as backup address 950.

CN120 also comprises authentication engine 970, and this authentication engine can authenticate the privately owned identifier that receives by using public keys 954 in message.Those skilled in the art will recognize that to separate with HoA to make to be used under the situation of Identification Lists item 940 that the variation of SHoA can not cause CN120 to create new list item 940 at privately owned identifier.On the contrary, the message that comprises known privately owned identifier of CN120 and new SHoA is correctly used by CN120, so that utilize the SHoA value that newly receives to rewrite the value of the SHoA 984 in the list item 940.

Although have been illustrated in the accompanying drawings and detailed description in front in several aspects of the preferred embodiment of method of the present invention, mobile node and communication node have been described, should be appreciated that and the invention is not restricted to the disclosed embodiments, but under the prerequisite that does not depart from the spirit of the present invention that the claim of enclosing states and limit, can carry out manyly rearranging, revising and substitute.

Claims

1. method of setting up session between by the mobile node of the service local agent service of local network and communication node, this method may further comprise the steps:

On described mobile node, specify local address by the selection of described service local agent definition;

On described mobile node, specify preferred address, wherein

If described mobile node is positioned among the described local network, then described preferred address is the local address of described selection, and

If described mobile node is arranged in accessed network, then described preferred address is a Care-of Address;

On described mobile node, specify privately owned identifier;

Set up message from described mobile node to described communication node transmission, the wherein said message of setting up comprises described privately owned identifier and described preferred address; And

Be described conversation establishing list item on described communication node, described list item comprises described privately owned identifier and described preferred address, and wherein said privately owned identifier is used to discern described session at described communication node.

2. the method for claim 1, wherein:

Described mobile node comprises a plurality of local addresss.

3. method as claimed in claim 2, wherein:

All described a plurality of local addresss all are by described service local agent definition; And

Described mobile node comprises the related of described a plurality of local address and described service local agent.

4. method as claimed in claim 2, wherein:

In described a plurality of local address at least one defined by described service local agent, and described mobile node comprises described at least one related with described service local agent in described a plurality of local address; And in described a plurality of local address another is defined by second local agent at least, described mobile node comprises described another related with described second local agent at least in described a plurality of local address.

5. method as claimed in claim 2 also comprises the steps:

Produce the tabulation of the one or more candidate's local addresss in described a plurality of local addresss on described mobile node, all the candidate's local addresss in the wherein said tabulation are associated with described service local agent; And

If described tabulation only comprises candidate's local address, then described candidate's local address is appointed as the local address of described selection, and

If described tabulation comprises the candidate's local address more than, then specify a local address of described one or more candidate's local address tabulations as described selection according to the preferred mobile node access interface that is used for described session.

6. method as claimed in claim 2, wherein:

The described message of setting up comprises that also the local address of described selection and indication are unallowed private ownership signs towards the route of described privately owned identifier; And

Described list item also comprises the local address and the described private ownership sign of described selection.

7. method as claimed in claim 6 also comprises step:

According to the variation of the preferred access interface that is used for described session, specify a local address in described a plurality of local address as second selection.

8. method as claimed in claim 7 also comprises step:

Send renewal from described mobile node, described renewal comprises described privately owned identifier, described private ownership designator and described second local address of selecting;

On described communication node by using described privately owned identifier to discern described list item; And

On described communication node,, upgrade described list item by replace the local address of described selection with described second local address of selecting.

9. the described method of claim 1 also comprises step:

Before creating described list item, use described preferred address to send the address test to described mobile node from described communication node; And in response to the test of described address, send confirmation form from described mobile node to described communication node, described confirmation form comprises described privately owned identifier and described preferred address.

10. method as claimed in claim 9, wherein:

Described privately owned identifier is based on the identifier of password; And

Described communication node is according to the described message and the described confirmation form set up of value authentication of described identifier based on password.

11. method as claimed in claim 10 also comprises step:

In response to described confirmation form, send affirmation to described mobile node from described communication node.

12. method as claimed in claim 11, wherein:

Described affirmation comprises the authentication secret key.

13. the method for claim 1 also comprises step:

Send renewal from described mobile node, described renewal comprises described privately owned identifier, backup address and backup mark;

Wherein:

Described preferred address is a Care-of Address,

Described backup address is the local address of described selection, and

If described preferred address can not arrive, then described communication node uses described backup address to send message to described mobile node.

14. the method for claim 1 also comprises step:

Send renewal from described mobile node, described renewal comprises described privately owned identifier, substitutes address and mobile mark;

Wherein:

Described renewal is in response to the change in location of described mobile node,

Described alternative address is the local address of described selection or new Care-of Address,

Described preferred address in the described list item of described alternative address rewrite and

Described communication node uses described alternative address to send any further message to described mobile node.

15. a communication node comprises:

Be used to receive the input port of message, described message comprises the privately owned identifier of session and the preferred address of mobile node; With the table that is used to store the item that is used for described session, wherein

Described item in the described table comprises described privately owned identifier and described preferred address, and

Described privately owned identifier is used to discern described session.

16. communication node as claimed in claim 15, wherein

Described message also comprises the local address of selection.

17. communication node as claimed in claim 16, wherein

Described input port is used for further receiving upgrading, and described renewal comprises extra address; And

Described table is used for described the described extra address of storage.

18. communication node as claimed in claim 17, wherein:

When described extra address was the local address of new selection, described table was used for utilizing described described extra address to rewrite the local address of described selection.

19. communication node as claimed in claim 17, wherein:

Described renewal also comprises mobile mark; And

In response to described mobile mark, described table utilizes the described extra address in described to rewrite described preferred address.

20. communication node as claimed in claim 17, wherein:

Described extra address is a backup address;

Described renewal also comprises backup mark; And

In response to described backup mark, described table is used for described the described backup address of storage.

21. communication node as claimed in claim 15, wherein:

The described message of setting up comprises also that to be used to indicate the route towards described privately owned identifier be unallowed private ownership sign.

22. a mobile node that is used to set up with the session of communication node, described mobile node comprises:

Be used for the access interface of communicating by letter with described communication node;

The mobility unit is used to specify local address as the local address of selecting, and does not obtain Care-of Address if described mobile node is connected to local network, and is used to select preferred address, and described preferred address is set to equal:

If described mobile node is not connected to described local network, then equal described Care-of Address, and

If described mobile node is connected to described local network, then equal the local address of described selection;

Be used to calculate the computing unit of privately owned identifier; With

Session management unit, be used to control described session, receive described preferred address from described mobility unit, receive described privately owned identifier and send described privately owned identifier and described preferred address to described communication node by described access interface from described computing unit.

23. mobile node as claimed in claim 22 also comprises:

Be used to the table storing the identity of one or more local agents and be used to store first local address and second local address, described first local address is associated with first local agent, and in described second local address and described first local agent and second local agent one is associated;

The local address of described selection is specified in wherein said mobility unit among described first local address and described second local address.

24. mobile node as claimed in claim 23, wherein:

If described first local address and described second local address are associated with different local agent:

If described mobility configuration of cells for described mobile node by the described first local agent service then choose the local address of described first local address as described selection,

If described mobility configuration of cells for described mobile node by the described second local agent service then choose the local address of described second local address as described selection; With

If described first local address and described second local address all are associated with first local agent:

Described mobility configuration of cells is for choosing a local address as described selection in described first local address and described second local address according to described access interface, wherein said access interface is preferably used for described session.

25. mobile node as claimed in claim 24, wherein:

Described mobility configuration of cells is for choosing a local address as second selection in described first local address or described second local address on described mobile node, wherein said second local address of selecting is different with the previous local address of selecting.

26. mobile node as claimed in claim 25, wherein:

Described mobility configuration of cells is to choose described second local address of selecting according to the change of the service local agent of described session.

27. mobile node as claimed in claim 25, wherein:

Described mobility configuration of cells is to choose described second local address of selecting according to the variation of the preferred access interface of described session.

28. mobile node as claimed in claim 25, wherein:

Described session management unit is used to receive from described second local address of selecting of described mobility unit and is used for sending described second local address and the described privately owned identifier of selecting by described access interface to described communication node.