CN101478793B - Seamless switching method for wireless heterogeneous network - Google Patents
Seamless switching method for wireless heterogeneous network Download PDFInfo
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- CN101478793B CN101478793B CN2008100322902A CN200810032290A CN101478793B CN 101478793 B CN101478793 B CN 101478793B CN 2008100322902 A CN2008100322902 A CN 2008100322902A CN 200810032290 A CN200810032290 A CN 200810032290A CN 101478793 B CN101478793 B CN 101478793B
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Abstract
The invention discloses a seamless switching method of a wireless heterogeneous network. When a mobile terminal needs to switch network, the present net router sends the switching order to the net router to be accessed, then the net router to be accessed sends an authentication request to an authentication server, and after authenticating that the configuration request is sent to a DHCP server and distributing a new IP address to the DHCP server, the present net router of the mobile terminal is informed of the IP address, and the net router to be accessed sends a connection request to the communication equipment of the mobile terminal, then the communication equipment copies and sends the communication information of the mobile terminal to the net router to be accessed after receiving the connection request, the connection with the present network of the mobile network is stopped after connection confirmation, and at the same time the mobile terminal updates the information of the location for the location ownership server. By the method, seamless switching of the network can be finished and the large-delay high packet error rate is avoided.
Description
Technical field
The present invention relates to field of wireless, particularly a kind of seamless switching method for wireless heterogeneous network.
Background technology
ETSI has made specific definition to the service quality (QoS) of the voice and the Media Stream of IP based network, be respectively: the highest, high, medium and four grades of best effort (best effort), wherein the highest and high two grades 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.
In the wireless switching one important and stubborn problem is how to support seamless roam when the terminal cross heterogeneous network.The solution that proposes in present document includes mobile IP, SCTP (the Stream ControlTransmission Protocol of transport layer of layer Network Based, SCTP) and the conversation initialized protocol of application layer (Session Initiation Protocol, SIP).
Wherein, the scheme of existing mobile IP is: obtain the temporary address and notify home domain to act on behalf of this temporary address after mobile node enters accesses network, mail to the message of mobile node raw address (home domain address) by the access domain agency of home domain server forwards with the corresponding node in its conversation to the mobile node place, arrive the temporary address of mobile node, described scheme can't be avoided mobile node and accesses network connect required time delay and the packet loss phenomenon before attribution server obtains notifying, and can increase away from the home network time-delay with mobile node.
The mobile scheme of SCTP is the characteristic that has many Su Duoliu according to SCTP, in moving, accesses network obtains new address (being the access domain address) and the temporary transient raw address (being the home domain address) that keeps at mobile node, the corresponding node of notice conversation is set up new the connection under the situation that keeps old connection, machine cuts off old connection in due course then.All use SCTP as transport layer and support this expansion but the prerequisite of this scheme is the place network of home network, accesses network, the corresponding node of mobile node, be based upon under the situation that TCP/UDP is a transport layer in great majority service now and switch improper for heterogeneous network.
SIP is that (Next Generation Networks, important protocol NGN) is in application layer to next generation network in the internet multimedia protocol frame.Session Initiation Protocol be 3GPP selected, as the core signaling protocol of 3G, its exploitation purpose is to be used to provide the senior multimedia communication service of crossing over the Internet.It is transparent for network lower floor that SIP moves scheme, can realize real end-to-end mobile management under the situation of not revising existing network configuration or user terminal.SIP also has superior autgmentability and stability.In addition, SIP still is used for the signaling protocol of session control simultaneously in mobile network's IMS.Therefore, SIP is considered to support ambulant quite attractive candidate scheme in the next generation wireless network.
The general mechanism (based on rfc3261) that the SIP inter-network is switched is to resend INVITE (demand signalling) behind the address acquisition to set up new being connected with session side in new accesses network.The defective of this method is: this process need is abandoned raw address (home address), so the packet loss that brings original connection to interrupt; And rebulid connection and need exchange sip message, add the time that connects with accesses network, tangible handoff delay will be arranged with corresponding node.
In some solutions that newly propose at the general machine-processed defective of SIP based on SIP, the most representative is that the people such as Banerjee of the Univ Maryland-Coll Park USA method based on B2BUA (Back-To-Back User Agent) that proposes is (referring to N.Banerjee, A.Acharya, and S.K.Das, " Seamless SIP-based mobility for multimediaapplications; " IEEE Network, pp.6-13, March/Apr.2006), and the people such as Zhang of University of British Columbia propose based on the JOIN method in the Session Initiation Protocol (referring to J.Zhang, H.C.B.Chan, and V.C.M.Leung, " A SIP-based seamless-handoff (S-SIP) scheme for heterogeneous mobilenetworks; " Wireless Communications and Networking Conference (WCNC), pp.3946-3950,2007), below will make a brief description to the defective and the deficiency of these two kinds of exemplary process:
The method based on B2BUA that people such as Banerjee propose has the major defect of following three aspects:
(1) it has only solved the problem of re-INVITE, do not solve the delay problem of attaching process (attach), and the latter is more important than the former.For this problem is described, quote measure portion in the aforementioned article at this: " typical parameter value is: t_attach=23.95369231 second, t_join=3.618 millisecond, t_re-invite=359.84 millisecond.The time of noticing attaching process is quite long, and this is because in handoff procedure, and when portable terminal (MH) was only received the small-signal that transmits from new base station, network detection and layoutprocedure had just brought into operation.Because signal strength signal intensity is too faint in the handoff procedure, layoutprocedure is a large amount of dynamic host allocation protocols (Dynamic Host ConfigurationProtocol DHCP) has spent a large amount of time in the message transmission failure ... ".This shows that INVITE/JOIN order only just can be enabled after MH is attached to new access route, and this adheres to the time and needs 23.95 seconds!
(2) this method level that only is only applicable to is switched i.e. switching between the homogenous networks.This is because UA_II will converse with BS_I, so they must be in the homogeneous network.
(3) since in this structural requirement network all base stations all be equipped with a B2BUA, so operator differs surely and to accept.What people such as Zhang proposed has the major defect of following three aspects based on the JOIN method in the Session Initiation Protocol:
(1) even MH moves into a High Speed Network (such as WLAN (wireless local area network) WLAN), MH handles DHCP and the AAA relevant information still will spend the plenty of time, reason such as preceding.
(2) initiate the INVITE/JOIN process by MH and can spend the plenty of time, reason such as preceding.
(3) only considered the consequence that copy package causes at the MH end, and do not had the influence of consideration at corresponding node (CH), this can lead to grave consequences at the CH end.
In sum, how to solve that the seamless switching problem of wireless isomer network is real to have become the technical task that those skilled in the art need to be resolved hurrily.
Summary of the invention
The object of the present invention is to provide a kind of seamless switching method for wireless heterogeneous network,, realize the seamless switching of network with the generation of the situation of the high Packet Error Ratio of avoiding delaying time greatly.
In order to achieve the above object, seamless switching method for wireless heterogeneous network provided by the invention, comprise step: the portable terminal that 1) is in the first router overlay network is when entering the network of the second router covering, and described the second router sends the frame head information of the channel conditions that comprises its place network to described portable terminal by coupled base station; 2) described portable terminal determines whether to carry out the network insertion switching according to the channel conditions of frame head information that receives and described the first router overlay network, when determining to switch, described portable terminal sends the switching command that comprises handover information with user agent 1 identity to described the first router, and divide to described the second router with user agent 2 identity and to send the switching command that does not contain handover information, described the first router sends it to described the second router after receiving the described switching command that comprises handover information more simultaneously; 3) representative used the described portable terminal of user agent's 2 identity to send authentication request to the certificate server of its place network after described the second router was checked respectively the switching command that is sent to user agent 2 identity by described the first router and described portable terminal, and after passing through, authentication represent the described portable terminal that uses user agent's 2 identity to send configuring request again to the dynamic host allocation protocol server of place network, after described dynamic host allocation protocol server was according to the described mobile terminal configuration corresponding IP address of described configuring request for use user agent 2 identity, described the second router sent the IP address information that is disposed respectively to described portable terminal that uses user agent's 2 identity and described the first router; 4) the described IP address information of using the described portable terminal of user agent's 2 identity to receive is preserved, and described the first router also sends to described IP address information portable terminal and the preservation with user agent's 1 identity simultaneously; 5) described portable terminal is checked respectively by the IP address that is configured to user agent's 2 identity after the IP address information that receives with user agent's 1 identity with user agent's 2 identity, will switch to the state that communicates with described the second router with the pairing state of user agent's 2 identity simultaneously; 6) the described the second router representative described portable terminal that uses user agent's 2 identity is to just sending connection request with the equipment of described communication of mobile terminal, after described equipment feeds back to agreement information, begin to mail to with the information of same of described communication of mobile terminal the time described the second router; 7) after the described the second router agreement information that will receive is sent to the described portable terminal that uses user agent's 2 identity, use the described portable terminal of user agent's 2 identity after receiving described agreement information, to send corresponding confirmation to described equipment, mail to described the second router when beginning the information of same of communicating by letter by the first router by described the second router; 8) described equipment is connected to disconnect with the connection request of the described portable terminal that uses user agent's 1 identity to described the first router transmission disconnection after receiving described confirmation, uses the described portable terminal of user agent's 2 identity to upgrade its position information to finish the network switching to the position of described portable terminal attribution server simultaneously.
Wherein, described the second router can be the INVITE request of band JOIN header field to the connection request that just sends with the equipment of described communication of mobile terminal, comprises the session id of having set up with the portable terminal and the described equipment of user agent's 1 identity in the wherein said JOIN header field.
In sum, after seamless switching method for wireless heterogeneous network of the present invention has been made the decision of WLAN (wireless local area network) switching at portable terminal, the network router at its place is to network router forwarding contexts to be accessed, assist to finish aaa authentication and the new IP address assignment of DHCP by network router to be accessed, and for the INVITE/JOIN order of portable terminal in the corresponding node transmission SIP order that is just communicating with, so can solve the high speed seamless switching problem between IP-based wireless isomer network, the generation of the situation of the high Packet Error Ratio of avoiding delaying time greatly.
Description of drawings
Fig. 1 is the structural representation of a wireless isomer network of seamless switching method for wireless heterogeneous network of the present invention.
Fig. 2 is the operating process schematic diagram of seamless switching method for wireless heterogeneous network of the present invention.
Embodiment
See also Fig. 1, the structural representation of one wireless isomer network of seamless switching method for wireless heterogeneous network of the present invention, the portable terminal (being mobile node) that is in the first router (the being couple in router A) overlay network (being accesses network A) passes through first base station, couple in router A and Inernet and an equipment (being corresponding node) communicate, wherein, the position attribution server has write down the current location information of mobile node, simultaneously, mobile node moves to the network (being accesses network B) that the second router (being couple in router B) is covered, described accesses network B disposes the joining aaa authentication server with couple in router B, Dynamic Host Configuration Protocol server and corresponding a plurality of second base stations, see also Fig. 2, the seamless handover method of described mobile node in described wireless isomer network may further comprise the steps at least:
The first step: the mobile node that is in accesses network A is when entering accesses network B, and described couple in router B sends the frame head information of the channel conditions that comprises its place network to described portable terminal by the second coupled base station.
Second step: described mobile node determines whether to carry out network insertion switching (promptly carrying out handover decisions) according to the channel conditions of frame head information that receives and described accesses network A, when determining to switch, described portable terminal sends the switching command that comprises handover information with user agent 1 identity to couple in router A, and divide B to send the switching command that does not contain handover information to couple in router with user agent 2 identity, again it is sent to described couple in router B after described couple in router A receives described switching command simultaneously, particularly, send switching command and carry the switching information needed to couple in router A by the identity of mobile node earlier with user agent 1, then couple in router A transmits the switching command that carries information needed and gives couple in router B (promptly initiating to switch and carrying switching information needed), and mobile node sends switching command (promptly initiating to switch) with user agent 2 identity to couple in router B simultaneously.
The 3rd step: described couple in router B checks respectively by described couple in router A and described portable terminal and uses the described portable terminal of user agent's 2 identity to send authentication request to the aaa authentication server of its place network with switching command (promptly checking the switch flag of receiving from different interfaces) the back representative that user agent 2 identity is sent to, and after passing through, authentication represent the described portable terminal that uses user agent's 2 identity to send configuring request again to dynamic host allocation protocol (DHCP) server of place network, after described dynamic host allocation protocol server according to described configuring request is mobile terminal configuration corresponding IP address with user agent's 2 identity, described the second router sends the IP address information that is disposed respectively to described portable terminal that uses user agent's 2 identity and described the first router, particularly, ask to the aaa authentication server transmission AAA of couple in router B place network with the portable terminal of user agent's 2 identity by couple in router B representative earlier, the aaa authentication server is replied AAA to couple in router B, couple in router B representative is with the portable terminal broadcasting dhcp discover message of user agent's 2 identity then, then the Dynamic Host Configuration Protocol server of couple in router B place network gives information to couple in router B answer DHCP, wherein comprise the IP address of distributing to the portable terminal of user agent's 2 identity, then couple in router B is to inform its IP address in the acquisition of couple in router B place network with the mobile terminal to send message of user agent's 2 identity, simultaneously couple in router B also sends the message that comprises with the new IP address of the portable terminal of user agent's 2 identity to couple in router A, and then couple in router A is to transmit the message that comprises with the new IP address of the portable terminal of user agent's 2 identity with the portable terminal of user agent's 1 identity.
The 4th step: the described IP address information that the described portable terminal of use user agent 2 identity will receive is preserved, and described the first router also sends to described IP address information described portable terminal and the preservation of using user agent's 1 identity simultaneously.
The 5th step: described portable terminal is checked respectively by after the IP address information that receives with user agent's 1 identity with user agent's 2 identity oneself state being switched to the state that communicates with described the second router, be that mobile node is more respectively with user agent's 1 identity and the address information received with user agent's 2 identity, check the back configure user and act on behalf of the IP address of 2 identity, and switch the SIP state to early stage dialogue state, and obtained the DHCP service with the portable terminal broadcasting user agency 2 of user agent's 2 identity by couple in router B representative, and Dynamic Host Configuration Protocol server promptly stops to provide DHCP service after server B acknowledges receipt of broadcasting.
The 6th step: described couple in router B representative uses the described portable terminal of user agent's 2 identity to send connection request to the equipment of just communicating by letter with described mobile node (being corresponding node), after described corresponding node feeds back to agreement information, begin to mail to will be with information of same that described mobile node is communicated by letter the time described couple in router B, mail to described the second router during the information of same that begins to communicate by letter by the first router, particularly, it is couple in router B representative sends band JOIN header field to corresponding node (being destination node) with the portable terminal of user agent's 2 identity INVITE request, JOIN header field in the request comprises the session id of having set up with the portable terminal of user agent's 1 identity and corresponding node, then send 200OK to couple in router B behind the corresponding node checking session id, and begin to duplicate the Multimedia session bag and mail to couple in router B, couple in router B is forwarded to portable terminal with user agent's 2 identity with the session bag.
The 7th step: the agreement information that described couple in router B will receive (being 200OK) is sent to the described portable terminal that uses user agent's 2 identity, use the described portable terminal of user agent's 2 identity after receiving described agreement information, to send corresponding confirmation (being ACK) to described corresponding node by described couple in router B, particularly, at first transmit 200OK to portable terminal with user agent's 2 identity by couple in router B, receive that with the portable terminal of user agent's 2 identity session is set up behind the 200OK, after session is set up, portable terminal with user agent's 2 identity sends ACK (affirmation) solicited message to couple in router B, then couple in router B transmits described affirmation and asks corresponding node, and corresponding node and the described portable terminal that uses user agent's 2 identity are communicated.
The 8th step: described corresponding node sends disconnection to described couple in router A and is connected to disconnect with the connection request of the described portable terminal that uses user agent's 1 identity after receiving described confirmation, use the described portable terminal of user agent's 2 identity to upgrade its position information to finish the network switching simultaneously to the position of described mobile node attribution server, particularly, at first send the BYE request and stop to send session packet to couple in router A to portable terminal with user agent's 1 identity by corresponding node, then couple in router A forwarding BYE asks the portable terminal with user agent's 1 identity, send 200OK with the portable terminal of user agent's 1 identity to couple in router A then and represent to disconnect session with corresponding node, couple in router A transmits 200OK and makes corresponding node and session connection disconnection with the portable terminal of user agent's 1 identity to corresponding node then, portable terminal with user agent's 2 identity sends the REGISTER request that has the network address, couple in router B place to couple in router B simultaneously, transmit the position attribution server that REGISTER asks the mobile node home network by couple in router B again, described position attribution server upgrades the address binding of mobile node, and to couple in router B transmission 200OK, couple in router B transmits 200OK and finishes to the portable terminal Notify Address Binding Update with user agent's 2 identity.
In sum, seamless switching method for wireless heterogeneous network of the present invention after portable terminal has been made the decision that WLAN (wireless local area network) switches, the access network router at its place is to network router forwarding contexts to be accessed, assist to finish aaa authentication and the new IP address assignment of DHCP by network router to be accessed, can avoid attaching process (attach) the long time delay problem of such scheme like this.In addition, keeping the new SIP connection of setting up on original SIP connection basis via network to be accessed, to guarantee not packet loss, and the signaling exchange process of access network with set up the initial signaling (INVITE) that newly is connected and carry out by network insertion router to be accessed and can't help mobile node and finish, thereby the network burden that can reduce the mobile node end like this adapts to delay time the greatly down situation of high Packet Error Ratio of wireless mobile environment.
Claims (2)
1. seamless switching method for wireless heterogeneous network is characterized in that comprising step:
1) portable terminal that is in the first router overlay network is when entering the network of the second router covering, and described the second router sends the frame head information of the channel conditions that comprises its place network to described portable terminal by coupled base station;
2) described portable terminal determines whether to carry out the network insertion switching according to the channel conditions of frame head information that receives and described the first router overlay network, when determining to switch, described portable terminal sends the switching command that comprises handover information with user agent 1 identity to described the first router, and sending the switching command that does not contain handover information to described the second router with user agent 2 identity, described the first router sends it to described the second router after receiving the described switching command that comprises handover information more simultaneously;
3) representative used the described portable terminal of user agent's 2 identity to send authentication request to the certificate server of its place network after described the second router was checked respectively the switching command that is sent to user agent 2 identity by described the first router and described portable terminal, and after passing through, authentication represent the described portable terminal that uses user agent's 2 identity to send configuring request again to the dynamic host allocation protocol server of place network, after described dynamic host allocation protocol server was according to the described mobile terminal configuration corresponding IP address of described configuring request for use user agent 2 identity, described the second router sent the IP address information that is disposed respectively to described portable terminal that uses user agent's 2 identity and described the first router;
4) the described IP address information of using the described portable terminal of user agent's 2 identity to receive is preserved, and described the first router also sends to described IP address information described portable terminal and the preservation of using user agent's 1 identity simultaneously;
5) described portable terminal is checked respectively by the IP address that is configured to user agent 2 identity after the IP address information that receives with user agent's 1 identity with user agent's 2 identity, will switch to the state that communicates with described the second router with the pairing state of user agent's 2 identity simultaneously;
6) the described the second router representative described portable terminal that uses user agent's 2 identity is to just sending connection request with the equipment of described communication of mobile terminal, after described equipment feeds back to agreement information, begin to mail to with the information of same of described communication of mobile terminal the time described the second router;
7) after the described the second router agreement information that will receive is sent to the described portable terminal that uses user agent's 2 identity, use the described portable terminal of user agent's 2 identity after receiving described agreement information, to send corresponding confirmation to described equipment, mail to described the second router when beginning the information of same of communicating by letter by the first router by described the second router;
8) described equipment is connected to disconnect with the connection request of the described portable terminal that uses user agent's 1 identity to described the first router transmission disconnection after receiving described confirmation, uses the described portable terminal of user agent's 2 identity to upgrade its position information to finish the network switching to the position of described portable terminal attribution server simultaneously.
2. seamless switching method for wireless heterogeneous network as claimed in claim 1, it is characterized in that: described the second router is to the INVITE request of the connection request that is just sending with the equipment of described communication of mobile terminal for band JOIN header field, comprises the session id that the described portable terminal that uses user agent's 1 identity and described equipment have been set up in the wherein said JOIN header field.
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| CN103929364A (en) * | 2014-05-07 | 2014-07-16 | 北京邮电大学 | Method and device for controlling intelligently collaborative multi-path transmission of receiving end |
| CN106850360B (en) * | 2017-01-10 | 2019-09-24 | 中国人民解放军国防信息学院 | A kind of across a network service switching method based on Session Initiation Protocol |
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| CN1805445A (en) * | 2006-01-12 | 2006-07-19 | 北京邮电大学 | Method of seamless switching for transmission of mobile stream media |
| CN1996786A (en) * | 2006-11-29 | 2007-07-11 | 北京邮电大学 | Novel wireless communication networking method based on the relay technology |
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| CN1805445A (en) * | 2006-01-12 | 2006-07-19 | 北京邮电大学 | Method of seamless switching for transmission of mobile stream media |
| CN1996786A (en) * | 2006-11-29 | 2007-07-11 | 北京邮电大学 | Novel wireless communication networking method based on the relay technology |
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