CN101594648A - The seamless handover method of individual territory net in IP Multimedia System - Google Patents
The seamless handover method of individual territory net in IP Multimedia System Download PDFInfo
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- CN101594648A CN101594648A CN 200810038253 CN200810038253A CN101594648A CN 101594648 A CN101594648 A CN 101594648A CN 200810038253 CN200810038253 CN 200810038253 CN 200810038253 A CN200810038253 A CN 200810038253A CN 101594648 A CN101594648 A CN 101594648A
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Abstract
The present invention proposes a kind of changing method of Wireless Personal Network, be used for solving Wireless Personal Network at the seamless safe switching problem of the high speed of IP Multimedia System.Have under the situation of ipsec tunnel in continuous Kaiyuan and to set up the second tunnel, and upgrade the node routing iinformation of each P-CSCF correspondence, individual territory net of setting up in moving is connected with the new of corresponding node in the session, keeps disconnecting the conversation continuity of original connection front and back.Simultaneously, the overhead of session packet is less in the inventive method.
Description
Technical field
The invention belongs to communication information technical field, relate to a kind of network seamless changing method, relate in particular to the seamless handover method of a kind of Wireless Personal Network in IP Multimedia System.
Background technology
ETSI has made specific definition to the voice of IP based network and the QoS of Media Stream, be respectively: the highest, high, medium and four grades of best effort (best effort), wherein the highest and high-gradely all require end-to-end delay less than 100 milliseconds, medium request is less than 150 milliseconds, and the data delay of best effort type is no more than 400 milliseconds.Hence one can see that when portable terminal experience network switches, and handover delay should be tried one's best little of to satisfy qos requirement.
The entrained electronic message unit of people gets more and more, and is the indispensable instrument of business people no longer as notebook computer, mobile phone, PDA etc., just progressively enters the common people's daily life.The function of these information equipments from strength to strength, simultaneously size is but more and more littler, works alone separately but people can not content just to them, but presses for the mutual of the information of carrying out easily between the various device.Therefore, can personal device is interconnected among a small circle and form network---PAN (Personal Area Network) (promptly individual territory net, english abbreviation PAN) is just arisen at the historic moment.
Wireless Personal Network (WPAN) is current computer network development one of field the most rapidly, but the switching of Wireless Personal Network research is confined to a mobile switching of net inside, territory more, lacks itself and the combining of core net.If lack the perception of core net, can't continue with a session of territory net exterior node in whole the moving of individual territory net individual territory net; And if lacked the management that net in a core Nets territory, individual territory net will be confined to the individual scope of application because of the network operation problem.
IMS (IP Multimedia System) is considered to the core technology of next generation network, also is to solve to move the important way that merges with fixed network.And the application of IMS still is experimental network at conceptual phase, existing IMS network, and extensibility is very strong.Is feasible with IMS as the backbone technology of realizing the Wireless Personal Network seamless switching.3 types CSCF (CSCF) is being born different functions in the IMS territory.P-CSCF is the acting server among the SIP (Session Initiation Protocol, Session initiation Protocol), and it is responsible for accepting request or responds and transmit.S-CSCF carries out the session control service, comprises the state of registering and keeping session, serves as the function of sip server.I-CSCF then is the interface that visiting from outside IMS carries out interactive communication with it, can realize hiding present network architecture in this way.
Switch at individual territory net, MAGNET project team of European Union moves the reconstruction that proposes ipsec tunnel to the integral body of in the individual net (PN) territory net and finishes switchings with node routing update mechanism, rebulids being connected of a territory net and interior other nodes of PN.But there are following two aspect defectives:
1, the MAGNET project at PN be not based on IMS, its net structure is independent of existing network technology, lacks the equipment support that operates under real network environment, and is not necessarily approved by Virtual network operator;
2, the individual territory net switching mode of PN remains the hard handover approach of the company of having no progeny earlier, can't avoid original ipsec tunnel be disconnected to new ipsec tunnel set up between the losing of session packet.
In the seamless switching scheme at SIP, the most representative is the method based on B2BUA (Back-To-Back User Agent) that the people such as Banerjee of Univ Maryland-Coll Park USA propose, and the people such as Zhang of University of British Columbia propose based on the JOIN method in the Session Initiation Protocol.Their defective is as follows:
1, the utilization of two kinds of methods all is that application layer is switched, and all similar switching flow must be arranged at each session, as is used for an integral body of territory net and switches and will bring a large amount of SIP signaling exchanges, increases load to network;
2, the switching of application layer is transparent to the gateway node of individual territory net, is unfavorable for a territory net management;
3, the method for Zhang is that the copy session bag mails to two user agents at the corresponding node place, and this makes, and the quantity of session packet almost doubles in the backbone network, has equally also increased load to network.
Summary of the invention
Technical problem to be solved by this invention is: the seamless handover method of a kind of Wireless Personal Network in IP Multimedia System is provided.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
The seamless handover method of a kind of territory net in IP Multimedia System, described territory net comprises some gateways, IP Multimedia System comprises some P-CSCF; First gateway is crossed by described territory Netcom, a P-CSCF, the 2nd P-CSCF are connected with corresponding node, and a described P-CSCF comprises a P-CSCF who connects corresponding node at least; Set up first ipsec tunnel between first gateway of individual territory net and a P-CSCF, set up second ipsec tunnel between a described P-CSCF and the 2nd P-CSCF, set up the 3rd ipsec tunnel between described the 2nd P-CSCF and corresponding node; This method comprises the steps:
Set up the 4th ipsec tunnel between second gateway of steps A, described territory net and the 3rd P-CSCF;
Step B, individual territory net are installed virtual route;
Set up the 5th ipsec tunnel between step C, described the 3rd P-CSCF and a P-CSCF;
Set up the 6th ipsec tunnel between step D, described the 3rd P-CSCF and the 2nd P-CSCF;
Step e, individual territory net upgrade virtual route;
Step F, disconnect described first ipsec tunnel, and when disconnecting, delete the node route of the first ipsec tunnel correspondence;
The node route of step G, deletion the 5th ipsec tunnel, the second ipsec tunnel correspondence;
The virtual route of step H, a deletion territory net;
Step I, described the 5th ipsec tunnel of disconnection, second ipsec tunnel.
As a preferred embodiment of the present invention, described IP Multimedia System also comprises S-CSCF, I-CSCF, HSS; Each P-CSCF is connected with S-CSCF, I-CSCF respectively; Described S-CSCF, I-CSCF are connected with HSS respectively.
As a preferred embodiment of the present invention, before described steps A, individual territory net enters the 3rd P-CSCF coverage, receives the frame head that the 3rd P-CSCF sends, thereby finds described the 3rd P-CSCF.
As a preferred embodiment of the present invention, comprise the steps: between described steps A and step B that second gateway passes through the 3rd P-CSCF and initiates register requirement to described IP Multimedia System, the registered address is a sip address of territory net; Thereby the 3rd P-CSCF binds at adding routing iinformation and described territory net after receiving the second gateway registration request, transmits register requirement again and gives I-CSCF; I-CSCF distributes to a S-CSCF of territory net to the HSS inquiry, obtains behind the result register requirement being transmitted to S-CSCF.
As a preferred embodiment of the present invention, also comprise the steps: the registration that second gateway is crossed by an IP Multimedia System acceptance territory Netcom between described steps A and step B, upgrade configuration member's information; Be specially: S-CSCF obtains authentication mode, algorithm and an authentication string of territory net from HSS, checks with the authentication header field in the register requirement; As verify that correctly then the login state of a territory net is " registered " among the S-CSCF renewal HSS; As verify incorrectly, then to upgrade the login state of a territory net among the HSS be " unsettled registration " to S-CSCF, and require to verify again to second gateway; After the good authentication, the sign among the S-CSCF definition HSS; S-CSCF obtains complete information about firms from HSS, promptly set up the information about firms of ipsec tunnel with individual territory net.
As a preferred embodiment of the present invention, comprise the steps: also between described steps A and step B that IP Multimedia System replys confirmation to second gateway of individual territory net and finish registration, and in the 3rd P-CSCF, virtual route is installed; Be specially: S-CSCF puts into confirmation with information about firms and replies to I-CSCF; I-CSCF transmits confirmation and gives the 3rd P-CSCF; The 3rd P-CSCF extracts the information about firms in the confirmation, and virtual route is installed; With the previous step while, the 3rd P-CSCF transmits confirmation and gives second gateway of territory net; Second gateway of individual territory net receives that confirmation finishes the gateway identity of other nodes in the registration back notice territory net.
As a preferred embodiment of the present invention, among the described step C, other just set up the 5th ipsec tunnel respectively with the P-CSCF of individual territory Netcom letter in the 3rd P-CSCF and the IP Multimedia System, and the process of setting up adopts dynamic approach, or adopts the static method that configuration file is installed in advance.
As a preferred embodiment of the present invention, comprise the steps: between described step C and step D that the 3rd P-CSCF sends subscribe request to second gateway, subscribes to a territory net node routing iinformation; Second gateway is received the subscribing relationship of replying confirmation foundation and the 3rd P-CSCF after the subscribe request; Second gateway is notified to the first time that the 3rd P-CSCF sends after setting up subscribing relationship at once, individual territory net node routing iinformation is put into the request inclusion issue the 3rd P-CSCF; The 3rd P-CSCF reply confirmation represent notified, and with individual territory net node routing iinformation and Notify (notice) via the 4th ipsec tunnel bind the virtual route of adding.
As a preferred embodiment of the present invention, comprise the steps: to share between each P-CSCF the routing iinformation of the node of having jurisdiction over separately between described step D and step e, if routing iinformation belongs to node or the node cluster that directly links to each other with this P-CSCF, then do not delete original routing iinformation and add in the virtual route; If routing iinformation does not belong to the node that directly links to each other with this P-CSCF, then cover the routing iinformation of same node point in the virtual route with the routing iinformation of newly receiving.Be specially: the 3rd P-CSCF send subscribe request to just with or need set up other P-CSCF of secured session with individual territory net, subscribe to the routing iinformation of node that other P-CSCF connect; Receive that the P-CSCF of subscribe request replys the subscribing relationship of confirmation foundation and the 3rd P-CSCF; P-CSCF1 notifies to the first time that the 3rd P-CSCF sends after setting up subscribing relationship at once, individual territory net node routing iinformation is put into Notify request inclusion issue the 3rd P-CSCF; The 3rd P-CSCF answer confirmation is represented notified, and individual territory net node routing iinformation and the binding of the 5th ipsec tunnel are added virtual route; P-CSCF2 notifies to the first time that the 3rd P-CSCF sends after setting up subscribing relationship at once, the corresponding node routing iinformation is put into Notify request inclusion issue the 3rd P-CSCF; The 3rd P-CSCF answer confirmation is represented notified, and corresponding node routing iinformation and the binding of the 6th ipsec tunnel are added virtual route; Other P-CSCF of IP Multimedia System also set up subscribing relationship to initiate the 3rd P-CSCF, obtain a notice of territory net node route from the 3rd P-CSCF, and with Notify via the ipsec tunnel binding add each self-virtualizing route.
As a preferred embodiment of the present invention, also comprise the steps: between described step D and step e bag that each P-CSCF will receive according to target node address mail to the ipsec tunnel of binding in the virtual route except that the ipsec tunnel of bag source.
As a preferred embodiment of the present invention, step G and step H also comprise the steps: describedly to lose when being connected with it when P-CSCF detects territory net first gateway, nullify a territory net to IP Multimedia System, disconnect the ipsec tunnel netted with a territory and and other P-CSCF between ipsec tunnel, and delete virtual route; Be specially a P-CSCF and disconnect and first ipsec tunnel of territory net, and delete item corresponding in the virtual route with it; The one P-CSCF replaces a territory net to send revocation information to S-CSCF; The login state that S-CSCF upgrades a territory net among the HSS is " unregistered ", and with corresponding information deletion among the HSS; S-CSCF replys confirmation and finishes cancellation for a P-CSCF; The one P-CSCF transmission Notify asks to notify a territory net to lose with it to other P-CSCF and is connected; Other P-CSCF receive Notify request back deletion institute via ipsec tunnel corresponding virtual route entry, and answer confirmation; After the one P-CSCF receives confirmation, delete whole virtual route; The one P-CSCF disconnects the ipsec tunnel with the 2nd P-CSCF and the 3rd P-CSCF.
As a preferred embodiment of the present invention, described IP Multimedia System comprises some the 2nd P-CSCF, and corresponding second ipsec tunnel, the 3rd ipsec tunnel, the 6th ipsec tunnel are respectively some.
Beneficial effect of the present invention is: the changing method of a kind of Wireless Personal Network that the present invention proposes is used for solving Wireless Personal Network at the seamless safe switching problem of the high speed of IP Multimedia System.Have under the situation of ipsec tunnel in continuous Kaiyuan and to set up the second tunnel, and upgrade the node routing iinformation of each P-CSCF correspondence, individual territory net of setting up in moving is connected with the new of corresponding node in the session, keeps disconnecting the conversation continuity of original connection front and back.Simultaneously, this method makes the overhead of session packet minimize as far as possible.
Description of drawings
Fig. 1 switches schematic diagram for Wireless Personal Network.
Fig. 2 is Wireless Personal Network seamless switching signaling process figure.
Fig. 3 to Fig. 6 is the virtual routing update and bag forwarding process figure in the Wireless Personal Network seamless switching.
Embodiment
Describe the preferred embodiments of the present invention in detail below in conjunction with accompanying drawing.
Embodiment one
See also Fig. 1, the present invention has disclosed the seamless handover method of a kind of territory net in IP Multimedia System, and described territory net comprises some gateways, and IP Multimedia System (being IMS) comprises some P-CSCF; First gateway is crossed by described territory Netcom, a P-CSCF, the 2nd P-CSCF are connected with corresponding node, and a described P-CSCF comprises a P-CSCF who connects corresponding node at least; Set up first ipsec tunnel between first gateway of individual territory net and a P-CSCF, set up second ipsec tunnel between a described P-CSCF and the 2nd P-CSCF, set up the 3rd ipsec tunnel between described the 2nd P-CSCF and corresponding node.Described IMS also comprises S-CSCF, I-CSCF, HSS; Each P-CSCF is connected with S-CSCF, I-CSCF respectively; Described S-CSCF, I-CSCF are connected with HSS respectively.Wherein, HSS is developed by the attaching position register (HLR) of 2G, is the network data base of supporting user's registration and depositing user identity, position data and filtering policy information.HSS also is responsible for the management that the user carries out the authentication and authorization control information of networking access.
Present embodiment is succinct in order to narrate, and comprises that with a described P-CSCF one the one P-CSCF (being P-CSCF 1 among the figure) is the example narration, and the first corresponding ipsec tunnel also is one first ipsec tunnel.
| VPON | Gateway@IP | | |
| VPON1 | Gateway | ||
| 1 of PAN | P-CSCF1 | ||
| VPON1 | CH | P-CSCF 2 | |
| | Gateway | 2 of PAN | P-CSCF 3 |
| ... | ... | ... |
The VPON membership table of S-CSCF among table 1 IMS
| VPON-ID | PN Prefix | (Gateway@IP，P-CSCF@IP) |
| |
PersonX-Prefix | ( |
The VPON membership table of HSS among table 2 IMS
See also Fig. 1 and Fig. 2, Wireless Personal Network proposed by the invention seamless handover method under IMS specifically comprises the steps:
S01, individual territory net (PAN) enter the overlay network of P-CSCF3, receive the frame head that P-CSCF3 sends.
S02, PAN make the switching decision according to channel conditions and other information of P-CSCF1 side and P-CSCF3 side network, activate second gateway, set up ipsec tunnel (the 4th IPSEC tunnel) between second gateway and P-CSCF3.Concrete steps are:
● second gateway of PAN and P-CSCF3 exchange of signaling, finish link layer and insert;
● second gateway foundation of PAN and the ipsec tunnel (the 4th IPSEC tunnel) (following the ISAKMP agreement) between P-CSCF3.
On behalf of PAN, second gateway of S03, PAN initiate registration by P-CSCF3 to IMS.Be specially:
● second gateway of PAN sends the Register request to P-CSCF3, and the registered address is the sip address (sip:PerxonX@IMS in this example) of PAN;
● P-CSCF3 receive Register request back add routing iinformation [Path:P-CSCF 3@IMS] thus with the PAN binding, transmit Register again and ask to I-CSCF;
● I-CSCF inquires about the S-CSCF that distributes to PAN to HSS, obtains behind the result Register being transmitted to S-CSCF.S04, IMS accept the registration of PAN by second gateway, upgrade configuration VPON information about firms.Be specially:
● S-CSCF checks with the authentication header field in the Register request from authentication mode, algorithm and authentication string that HSS obtains PAN;
● as verify that correctly then the login state of PAN is " registered " among the S-CSCF renewal HSS; As verify incorrectly, then to upgrade the login state of PAN among the HSS be " unsettled registration " and reply 401Unauthorized to second gateway of PAN and require to verify again to S-CSCF;
● after the good authentication, the VPON-ID among the S-CSCF definition HSS (then in this, add second gateway of PAN and the address of P-CSCF3 as the VPON item that contains PAN in this example, then set up VPON-ID) as the VPON item that does not contain PAN;
● S-CSCF obtains complete VPON information about firms from HSS, promptly set up the information about firms (first gateway of the PAN in the present embodiment, second gateway of PAN, corresponding node reach the information of the P-CSCF of binding separately) of ipsec tunnel with PAN.
S05, IMS reply 200OK to PAN gateway node 2 and finish registration, and in P-CSCF3 virtual route are installed.Concrete steps are:
● S-CSCF puts into 200OK with the VPON information about firms and replies to I-CSCF;
● I-CSCF transmits 200OK and gives P-CSCF3;
● P-CSCF 3 extracts VPON information about firms among the 200OK, and virtual route is installed;
● with the previous step while, P-CSCF3 transmits second gateway that 200OK gives PAN;
● second gateway of PAN receives that 200OK finishes its gateway identity of other nodes in the notice PAN of registration back.
| Node | Tunnel ID | |
| Gateway | ||
| 1 of |
4 | GW P- |
| Gateway | ||
| 2 of |
4 | GW P-CSCF |
| Laptop of |
4 | GW P-CSCF |
| Cellphone of |
4 | GW P-CSCF |
| CH | 1 | P-CSCF P-CSCF |
The virtual routing table of P-CSCF1 among table 3 Fig. 3
| Node | Tunnel ID | |
| Gateway | ||
| 1 of PAN | 1 | P-CSCF P- |
| Gateway | ||
| 2 of PAN | 1 | P-CSCF P-CSCF |
| Laptop of PAN | 1 | P-CSCF P-CSCF |
| Cellphone of PAN | 1 | P-CSCF P- |
| CH | ||
| 5 | GW P-CSCF |
The virtual routing table of P-CSCF2 among table 4 Fig. 3
S06, see also table 5 to table 7, other P-CSCF that just communicating by letter with PAN of P-CSCF3 and IMS set up ipsec tunnel, the process of foundation can adopt with step S02 in set up the same dynamic approach in tunnel between second gateway and P-CSCF3, also can adopt the static method of prior installation configuration file.Concrete steps are:
● P-CSCF3 set up with the P-CSCF1 that belongs to PAN access P-CSCF together between ipsec tunnel;
● the ipsec tunnel between the P-CSCF2 that P-CSCF3 sets up and corresponding node inserts.
| Node | Tunnel ID | |
| Gateway | ||
| 1 of |
4 | GW P- |
| Gateway | ||
| 2 of |
4 | GW P-CSCF |
| Laptop of |
4 | GW P-CSCF |
| Cellphone of |
4 | GW P-CSCF |
| CH | 1 | P-CSCF P-CSCF |
The virtual routing table of P-CSCF1 among table 5 Fig. 4
| Node | Tunnel ID | |
| Gateway | ||
| 1 of PAN | 1 | P-CSCF P- |
| Gateway | ||
| 2 of PAN | 1 | P-CSCF P-CSCF |
| Laptop of PAN | 1 | P-CSCF P-CSCF |
| Cellphone of PAN | 1 | P-CSCF P- |
| CH | ||
| 5 | GW P-CSCF |
The virtual routing table of P-CSCF 2 among table 6 Fig. 4
| Node | Tunnel ID | |
| Gateway | ||
| 1 of |
6 | GW P- |
| Gateway | ||
| 2 of |
6 | GW P-CSCF |
| Laptop of |
6 | GW P-CSCF |
| Cellphone of |
6 | GW P-CSCF |
The virtual routing table of P-CSCF3 among table 7 Fig. 4
S07, PAN gateway upgrade PAN node route to P-CSCF3, and concrete routing iinformation is seen Fig. 4.Concrete steps are:
● P-CSCF3 transmission Subscribe asks second gateway to PAN, subscribes to PAN node routing iinformation;
● second gateway of PAN is received the subscribing relationship that 200OK foundation and P-CSCF3 are replied in Subscribe request back;
● second gateway of PAN is notified to the first time that P-CSCF3 sends after setting up subscribing relationship at once, PAN node routing iinformation is put into Notify request inclusion issue P-CSCF3;
● P-CSCF3 reply 200OK represent notified, and with PAN node routing iinformation and Notify via the virtual route of ipsec tunnel (the 4th IPSEC tunnel) binding adding.
S08, see also table 8 to table 10, share the routing iinformation of the node of having jurisdiction over separately between each P-CSCF, the node (or node cluster) that if routing iinformation belongs to and this P-CSCF directly links to each other (type that is the existing corresponding ipsec tunnel of same node point in the virtual route is GW_P-CSCF), do not delete original routing iinformation and add in the virtual route; If routing iinformation does not belong to the node (type that is the existing corresponding ipsec tunnel of same node point in the virtual route is P-CSCF_P-CSCF) that directly links to each other with this P-CSCF, then cover the routing iinformation of same node point in the virtual route with the routing iinformation of newly receiving.Concrete routing iinformation is seen Fig. 5.Concrete steps are:
● P-CSCF3 send Subscribe ask to just with or need set up other P-CSCF (being P-CSCF1 and P-CSCF2 in this example) of secured session with PAN, subscribe to the routing iinformation of node that other P-CSCF connect;
● receive that the P-CSCF of Subscribe request replys the subscribing relationship of 200OK foundation and P-CSCF3;
● P-CSCF1 notifies to the first time that P-CSCF3 sends after setting up subscribing relationship at once, PAN node routing iinformation is put into Notify request inclusion issue P-CSCF3;
● P-CSCF3 answer 200OK represents notified, and PAN node routing iinformation and tunnel the 5th IPSEC tunnel binding are added virtual route;
● P-CSCF2 notifies to the first time that P-CSCF3 sends after setting up subscribing relationship at once, the corresponding node routing iinformation is put into Notify request inclusion issue P-CSCF3;
● P-CSCF3 answer 200OK represents notified, and corresponding node routing iinformation and tunnel ID3 binding are added virtual route;
● identical with the S07 above-mentioned steps, other P-CSCF of IMS also set up subscribing relationship to initiate P-CSCF3, obtain the notice of PAN node route from P-CSCF3, and with Notify via the ipsec tunnel binding add each self-virtualizing route (not marking among Fig. 2).
| Node | Tunnel ID | |
| Gateway | ||
| 1 of |
4 | GW P- |
| Gateway | ||
| 1 of PAN | 2 | P-CSCF P- |
| Gateway | ||
| 2 of |
4 | GW P- |
| Gateway | ||
| 2 of PAN | 2 | P-CSCF P-CSCF |
| Laptop of |
4 | GW P-CSCF |
| Laptop of PAN | 2 | P-CSCF P-CSCF |
| Cellphone of |
4 | GW P-CSCF |
| Cellphone of PAN | 2 | P-CSCF P-CSCF |
| CH | 1 | P-CSCF P-CSCF |
The virtual routing table of P-CSCF1 among table 8 Fig. 5
| Node | Tunnel ID | |
| Gateway | ||
| 1 of PAN | 3 | P-CSCF P- |
| Gateway | ||
| 2 of PAN | 3 | P-CSCF P-CSCF |
| Laptop of PAN | 3 | P-CSCF P-CSCF |
| Cellphone of PAN | 3 | P-CSCF P- |
| CH | ||
| 5 | GW P-CSCF |
The virtual routing table of P-CSCF2 among table 9 Fig. 5
| Node | Tunnel ID | |
| Gateway | ||
| 1 of |
6 | GW P- |
| Gateway | ||
| 1 of PAN | 2 | P-CSCF P- |
| Gateway | ||
| 2 of |
6 | GW P- |
| Gateway | ||
| 2 of PAN | 2 | P-CSCF P-CSCF |
| Laptop of |
6 | GW P-CSCF |
| Laptop of PAN | 2 | P-CSCF P-CSCF |
| Cellphone of |
6 | GW P-CSCF |
| Cellphone of PAN | 2 | P-CSCF P-CSCF |
| CH | 3 | P-CSCF P-CSCF |
The virtual routing table of P-CSCF3 among table 10 Fig. 5
The bag that S09, each P-CSCF will receive according to target node address mails to the ipsec tunnel of binding in the virtual route (in order to avoid cyclic transfer) except that the ipsec tunnel of bag source, and specifically forwarding figure sees Fig. 3 to Fig. 6.
S10, see also table 11, table 12, when losing and be connected (not replying) with it when P-CSCF detects PAN first gateway by Subscribe request next time, nullify PAN to IMS, disconnect and the ipsec tunnel of PAN and and other P-CSCF between ipsec tunnel, and delete virtual route, concrete routing iinformation is seen Fig. 6.Concrete steps are:
● P-CSCF1 disconnects the ipsec tunnel (an IPSEC tunnel) with PAN, and deletes item corresponding with it in the virtual route;
● P-CSCF1 replaces PAN to send Deregister to S-CSCF;
● the login state that S-CSCF upgrades PAN among the HSS is " unregistered ", and with corresponding (Gateway 2 of PAN@IP, P-CSCF1 @IP) deletion in the VPON information among the HSS;
● S-CSCF replys 200OK and finishes cancellation to P-CSCF1;
● P-CSCF1 transmission Notify asks to notify PAN to lose with it to other P-CSCF and is connected;
● other P-CSCF receive Notify request back deletion institute via ipsec tunnel (the 5th IPSEC tunnel among ID1 among the P-CSCF2 and the P-CSCF3) corresponding virtual route entry, and answer 200OK;
● after P-CSCF1 receives 200OK, delete whole virtual route (if do not have other PAN coupled);
● the ipsec tunnel of P-CSCF1 disconnection and P-CSCF2 and P-CSCF3 (the 5th IPSEC tunnel among ID1 among the P-CSCF2 and the P-CSCF3).
| Node | Tunnel ID | |
| Gateway | ||
| 1 of PAN | 3 | P-CSCF P- |
| Gateway | ||
| 2 of PAN | 3 | P-CSCF P-CSCF |
| Laptop of PAN | 3 | P-CSCF P-CSCF |
| Cellphone of PAN | 3 | P-CSCF P- |
| CH | ||
| 5 | GW P-CSCF |
The virtual routing table of P-CSCF2 among table 11 Fig. 6
| Node | Tunnel ID | |
| Gateway | ||
| 1 of |
6 | GW P- |
| Gateway | ||
| 2 of |
6 | GW P-CSCF |
| Laptop of |
6 | GW P-CSCF |
| Cellphone of |
6 | GW P-CSCF |
| CH | 3 | P-CSCF P-CSCF |
The virtual routing table of P-CSCF3 among table 12 Fig. 6
The changing method of a kind of Wireless Personal Network that the present invention proposes is used for solving Wireless Personal Network at the seamless safe switching problem of the high speed of IP Multimedia System.Have under the situation of ipsec tunnel in continuous Kaiyuan and to set up the second tunnel, and upgrade the node routing iinformation of each P-CSCF correspondence, individual territory net of setting up in moving is connected with the new of corresponding node in the session, keeps disconnecting the conversation continuity of original connection front and back.Simultaneously, this method makes the overhead of session packet minimize as far as possible.
Embodiment two
The difference of present embodiment and embodiment one is that in the present embodiment, described IP Multimedia System comprises some the 2nd P-CSCF, and each the 2nd P-CSCF sets up second ipsec tunnel with a P-CSCF respectively, constitutes the second ipsec tunnel group; In like manner, the 3rd ipsec tunnel, the 6th ipsec tunnel also are respectively some.Thereby, set up or delete some tunnels when setting up or deleting above-mentioned tunnel respectively.
Above embodiment is the unrestricted technical scheme of the present invention in order to explanation only.Any modification or partial replacement that does not break away from spirit and scope of the invention all should be encompassed in the middle of the claim scope of the present invention.
Claims (13)
1, the seamless handover method of a kind of territory net in IP Multimedia System, described territory net comprises some gateways, IP Multimedia System comprises some P-CSCF; First gateway is crossed by described territory Netcom, a P-CSCF, the 2nd P-CSCF are connected with corresponding node; Set up first ipsec tunnel between first gateway of individual territory net and a P-CSCF, set up second ipsec tunnel between a described P-CSCF and the 2nd P-CSCF, set up the 3rd ipsec tunnel between described the 2nd P-CSCF and corresponding node; It is characterized in that this method comprises the steps:
Set up the 4th ipsec tunnel between second gateway of steps A, described territory net and the 3rd P-CSCF;
Step B, individual territory net are installed virtual route;
Set up the 5th ipsec tunnel between step C, described the 3rd P-CSCF and a P-CSCF;
Set up the 6th ipsec tunnel between step D, described the 3rd P-CSCF and the 2nd P-CSCF;
Step e, individual territory net upgrade virtual route;
Step F, disconnect described first ipsec tunnel, and when disconnecting, delete the node route of the first ipsec tunnel correspondence;
The node route of step G, deletion the 5th ipsec tunnel, the second ipsec tunnel correspondence;
The virtual route of step H, a deletion territory net;
Step I, described the 5th ipsec tunnel of disconnection, second ipsec tunnel.
2, seamless handover method according to claim 1 is characterized in that: described IP Multimedia System also comprises S-CSCF, I-CSCF, HSS; Each P-CSCF is connected with S-CSCF, I-CSCF respectively; Described S-CSCF, I-CSCF are connected with HSS respectively.
3, seamless handover method according to claim 1 is characterized in that: before described steps A, individual territory net enters the 3rd P-CSCF coverage, receives the frame head that the 3rd P-CSCF sends, thereby finds described the 3rd P-CSCF.
4, seamless handover method according to claim 2, it is characterized in that: comprise the steps: between described steps A and step B that second gateway passes through the 3rd P-CSCF and initiates register requirement to described IP Multimedia System, the registered address is a sip address of territory net; Thereby the 3rd P-CSCF binds at adding routing iinformation and described territory net after receiving the second gateway registration request, transmits register requirement again and gives I-CSCF; I-CSCF distributes to a S-CSCF of territory net to the HSS inquiry, obtains behind the result register requirement being transmitted to S-CSCF.
5, seamless handover method according to claim 2 is characterized in that: also comprise the steps: the registration that second gateway is crossed by an IP Multimedia System acceptance territory Netcom between described steps A and step B, upgrade configuration member's information; Be specially: S-CSCF obtains authentication mode, algorithm and an authentication string of territory net from HSS, checks with the authentication header field in the register requirement; As verify that correctly then the login state of a territory net is " registered " among the S-CSCF renewal HSS; As verify incorrectly, then to upgrade the login state of a territory net among the HSS be " unsettled registration " to S-CSCF, and require to verify again to second gateway; After the good authentication, the sign among the S-CSCF definition HSS; S-CSCF obtains complete information about firms from HSS, promptly set up the information about firms of ipsec tunnel with individual territory net.
6, seamless handover method according to claim 2, it is characterized in that: comprise the steps: also between described steps A and step B that IP Multimedia System replys confirmation to second gateway of individual territory net and finish registration, and in the 3rd P-CSCF, virtual route is installed; Be specially: S-CSCF puts into confirmation with information about firms and replies to I-CSCF; I-CSCF transmits confirmation and gives the 3rd P-CSCF; The 3rd P-CSCF extracts the information about firms in the confirmation, and virtual route is installed; With the previous step while, the 3rd P-CSCF transmits confirmation and gives second gateway of territory net; Second gateway of individual territory net receives that confirmation finishes the gateway identity of other nodes in the registration back notice territory net.
7, seamless handover method according to claim 1, it is characterized in that: among the described step C, other just set up the 5th ipsec tunnel respectively with the P-CSCF of individual territory Netcom letter in the 3rd P-CSCF and the IP Multimedia System, the process of setting up adopts dynamic approach, or adopts the static method that configuration file is installed in advance.
8, seamless handover method according to claim 2 is characterized in that: comprise the steps: between described step C and step D that the 3rd P-CSCF sends subscribe request to second gateway, subscribes to a territory net node routing iinformation; Second gateway is received the subscribing relationship of replying confirmation foundation and the 3rd P-CSCF after the subscribe request; Second gateway is notified to the first time that the 3rd P-CSCF sends after setting up subscribing relationship at once, individual territory net node routing iinformation is put into the request inclusion issue the 3rd P-CSCF; The 3rd P-CSCF reply confirmation represent notified, and with individual territory net node routing iinformation and Notify via the virtual route of the 4th ipsec tunnel binding adding.
9, seamless handover method according to claim 1, it is characterized in that: comprise the steps: to share between each P-CSCF the routing iinformation of the node of having jurisdiction over separately between described step D and step e, if routing iinformation belongs to node or the node cluster that directly links to each other with this P-CSCF, then do not delete original routing iinformation and add in the virtual route; If routing iinformation does not belong to the node that directly links to each other with this P-CSCF, then cover the routing iinformation of same node point in the virtual route with the routing iinformation of newly receiving.
10, seamless handover method according to claim 9, it is characterized in that: the step between described step D and step e is specially: the 3rd P-CSCF send subscribe request to just with or need set up other P-CSCF of secured session with individual territory net, subscribe to the routing iinformation of node that other P-CSCF connect; Receive that the P-CSCF of subscribe request replys the subscribing relationship of confirmation foundation and the 3rd P-CSCF; P-CSCF 1 notifies to the first time that the 3rd P-CSCF sends after setting up subscribing relationship at once, individual territory net node routing iinformation is put into Notify request inclusion issue the 3rd P-CSCF; The 3rd P-CSCF answer confirmation is represented notified, and individual territory net node routing iinformation and the binding of the 5th ipsec tunnel are added virtual route; P-CSCF 2 notifies to the first time that the 3rd P-CSCF sends after setting up subscribing relationship at once, the corresponding node routing iinformation is put into Notify request inclusion issue the 3rd P-CSCF; The 3rd P-CSCF answer confirmation is represented notified, and corresponding node routing iinformation and the binding of the 6th ipsec tunnel are added virtual route; Other P-CSCF of IP Multimedia System also set up subscribing relationship to initiate the 3rd P-CSCF, obtain a notice of territory net node route from the 3rd P-CSCF, and with Notify via the ipsec tunnel binding add each self-virtualizing route.
11, seamless handover method according to claim 9 is characterized in that: also comprise the steps: between described step D and step e bag that each P-CSCF will receive according to target node address mail to the ipsec tunnel of binding in the virtual route except that the ipsec tunnel of bag source.
12, according to any described seamless handover method of claim 1 to 11, it is characterized in that: step G and step H also comprise the steps: describedly to lose when being connected with it when P-CSCF detects territory net first gateway, nullify a territory net to IP Multimedia System, disconnect the ipsec tunnel netted with a territory and and other P-CSCF between ipsec tunnel, and delete virtual route; Be specially a P-CSCF and disconnect and first ipsec tunnel of territory net, and delete item corresponding in the virtual route with it; The one P-CSCF replaces a territory net to send revocation information to S-CSCF; The login state that S-CSCF upgrades a territory net among the HSS is " unregistered ", and with corresponding information deletion among the HSS; S-CSCF replys confirmation and finishes cancellation for a P-CSCF; The one P-CSCF transmission Notify asks to notify a territory net to lose with it to other P-CSCF and is connected; Other P-CSCF receive Notify request back deletion institute via ipsec tunnel corresponding virtual route entry, and answer confirmation; After the one P-CSCF receives confirmation, delete whole virtual route; The one P-CSCF disconnects the ipsec tunnel with the 2nd P-CSCF and the 3rd P-CSCF.
13, according to any described seamless handover method of claim 1 to 11, it is characterized in that: described IP Multimedia System comprises some the 2nd P-CSCF, and corresponding second ipsec tunnel, the 3rd ipsec tunnel, the 6th ipsec tunnel are respectively some.
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| CN102111827A (en) * | 2011-02-28 | 2011-06-29 | 北京邮电大学 | Switching control system and method in terminal collaboration of PAN |
| CN102546321A (en) * | 2010-12-30 | 2012-07-04 | 中兴通讯股份有限公司 | Method and system for processing services of personal network, and personal network equipment |
| CN102594646A (en) * | 2011-12-31 | 2012-07-18 | 成都市华为赛门铁克科技有限公司 | Switching method, switching device and transmission system of Internet protocol security tunnels |
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| WO2013010485A1 (en) * | 2011-07-20 | 2013-01-24 | 中兴通讯股份有限公司 | Personal area network-based method and device for seamless handover |
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| EP1472850B1 (en) * | 2002-01-29 | 2017-05-03 | Koninklijke Philips N.V. | A method and system for connecting mobile client devices to the internet |
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| CN112291822A (en) * | 2020-10-14 | 2021-01-29 | 中国联合网络通信集团有限公司 | Method and equipment for migrating multimedia subsystem |
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