CN101835226A - Rapid and vertical switching system and method between mobile communication network and wireless local area network - Google Patents
Rapid and vertical switching system and method between mobile communication network and wireless local area network Download PDFInfo
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Abstract
The invention provides rapid and vertical switching system and method between a mobile communication network and a wireless local area network. The method is based on an open IP multimedia subsystem and internet, and takes a wireless gateway as a vertical switching control center. The method has additional dual SIP (Session Initiation Protocol) and UA (User Agent) for a dual-mode mobile terminal and functional support for a packet filter, and has additional SIP B2B UA modules for a wireless gateway (RGW) and gate GPRS nodes and functional support for a packet filter. The method realizes rapid and vertical switching between the mobile communication network and the wireless local area network. The RGW (Residential Gateway) detects a switching accident in the process of switching, establishes a dialogue between the RGW and a GGSN (Gateway), and reduces the number of signal switching during the transmission on a wireless link. Media streams are copied to the switched target network by utilizing the dialogue, the performance of vertical switching is improved, and the service quality of real-time stream media and the transmission efficiency of file downloading in the process of switching are ensured.
Description
Technical field
The invention belongs to network communications technology field, particularly related to quick vertical switching system and method between a kind of mobile communications network and the WLAN (wireless local area network).
Technical background
Mobile communications network of overlapping covering (as UMTS/3G) and WLAN (wireless local area network) (as wifi etc.) in the future main network access mode will be provided, mobile communications network provides on a large scale, the network coverage of middle low rate, and WLAN (wireless local area network) provides among a small circle, the network coverage of two-forty.Both are combined, provide immanent network insertion to become a kind of trend.Wherein mobility is one of important research content wherein.
From the mobile management aspect, mobility can be divided into four types:
Vertical grand moving: the user uses different wireless access technologys, moves between different management domains;
Level is grand to be moved: the user uses identical unlimited access technology, moves between different management domains;
Vertical little moving: the user uses different wireless access technologys, moves between identical management domain;
Level is little to be moved: the user uses identical unlimited access technology, moves between identical management domain.
On related network layer, move moving property and mainly concentrate on three aspects such as network layer, transport layer, session layer.
In recent years, the network layer Research of Mobility has formed MIPv4 and MIPv6 version.For the greatest problem of real time flow medium is that the triangle route of mobile IP can cause great damage to service quality, is difficult to solve problems such as quick switching, low delay and minimal packet loss.Mobility route optimization can address this problem, but routing optimality also can produce new problem---need to revise IP stack and realize routing optimality, home agent can only be initiated routing optimality, so just cause the time-delay that adds, in addition, mobile IP need be in each packet the expense of additional encapsulation 8-20 byte.However, MIPv4 and MIPv6 can't solve the called problem of mobile host, are difficult to support the mobility of real meaning, have therefore carried out the auxiliary Research of Mobility of session layer.
The session layer Research of Mobility is mainly carried out around Session Initiation Protocol.SIP has the transparent characteristic of relative bottom, does not need IP layer, transport layer are made amendment, and becomes one of ambulant solution of complete IP network at present just gradually.Therefore, the ability of SIP is confined to the session control aspect remarkablely, itself has ambulant tenability, and terminal mobility, personal mobility, session mobility service mobility are provided.Directly the using SIP agreement is difficult to guarantee the real time flow medium application.
Research of Mobility example between heterogeneous network is many at present is research object with GPRS/UMTS, WLAN.People's such as Wei-Ming Chen article " Performance analysis of a mobility gateway forGPRS-WLAN integration; IEEE 60th Vehicular Technology Conference; 2004.Vol.6:4476-4480 " has been realized GPRS-WLAN mobile gateway (GWMG:GPRS-WLAN Mobility Gateway) in GPRS network and wlan network edge, the handover delay that main MIP of discussion and PDP Context switch, demonstration is not switched the influence to using." people Modeling the Push Mechanism for WGSN such as Wu L Y; FirstInternational Workshop on Broadband Wireless Services and Applications; San Jos é; CA; USA.2004:405-417. " realized above-mentioned propelling movement center by WGSN (Wlan-based GPRS Support Node), and it has been carried out Modeling Research, " people Performance evaluation of a push mechanism fbr WLANand mobile network integration such as Chang M F; IEEE Transactions on Vehicular Technology, 2006, Vol.55 (1): 380-383 " assessed solution based on WGSN, proved the seamless link that should mechanism realizes calling procedure, can not guarantee seamless switching to ongoing session." people SIP-based vertical handoff between WWANs andWLANs.IEEE Wireless Communications such as Wu W; 2005; Vol.12 (3): 66-72 " assessed the vertical performance of handoffs analysis based on SIP mechanism UMTS/WLAN, the result shows: because the Session Initiation Protocol bag is by the Radio Link transmission of error rate height and limited bandwidth, so WLAN needs unacceptable time-delay to the switching of UMTS, need to implement soft hand-off, measure such as high-speed servers and more effective host configuration guarantees, on the contrary, UMTS switches the less time-delay of experience to WLAN, comes the treatment S IP signaling mainly due to WLAN gateway and server.
At present, the problem of research existence is as follows:
(1) in vertical handover procedure, is difficult to guarantee not interrupt the session of current active;
(2) in vertical handover procedure, real time flow medium QoS meeting variation;
(3) in vertical handover procedure, switch dual can appear to the unequal problem of time-delay;
(4) in vertical handover procedure, can there be losing of data, reduce the file download efficiency.
Summary of the invention
The object of the present invention is to provide quick vertical switching system and method between a kind of mobile communications network and the WLAN (wireless local area network), realize mode mobile terminal seamless switching between heterogeneous wireless network, professional service quality such as real time flow medium business in the assurance handoff procedure and file download.
For achieving the above object, the invention provides quick vertical switching system between a kind of heterogeneous wireless network.From the source and destination relation of switching, network involved in the present invention comprises: the network that subscriber equipment was belonged to before source network and purpose network, source network were meant and switch, and the purpose network is meant the network that subscriber equipment will switch to; Type from network, network involved in the present invention comprises: mobile communications network and WLAN, wherein mobile communications network mainly refers to GPRS network or the 3G (Third Generation) Moblie network based on IP Multimedia System (IMS), is called for short the mobile communications network based on IMS.WLAN mainly refers to IEEE802.11 WLAN standard (802.11a/b/g/n), can connect by the Internet between mobile communications network and the WLAN (wireless local area network).From participating in professional equipment directly, equipment involved in the present invention comprises mode mobile terminal and opposite end business device, different opposite ends business device according to type of service can be different, and for example: for the real time flow medium business, the opposite end business device can make streaming media server; For file downloading service, the opposite end business device can be the file download service device; For network voice business (VoIP), opposite equip. can be the VoIP terminal.
In one embodiment of the invention, as shown in Figure 2, between mobile radio communication and the WLAN (wireless local area network) fast related network and the device of vertical switching system mainly comprise: support the mobile communications network based on IP Multimedia System, Gateway GPRS Support Node (E-GGSN), Wireless Local Area Network Gateway (RGW) and the mode mobile terminal (MH) of vertical handoff functionality fast, and the Internet and opposite end business device.Wherein with vertical switching E-GGSN and RGW between correlation be embodied in E-GGSN to control and manage wireless network be to cover WLAN (wireless local area network) that RGW controlled and managed, this also be wireless network with WLAN (wireless local area network) between can maybe need to carry out quick vertical switching necessary condition.The mobile communications network based on IP Multimedia System (IMS) of wherein supporting fast vertical handoff functionality mainly is to increase the addressing function (deployment information that need definition crucial AP and GGSN of RGW to E-GGSN existing on based on the mobile communications network basis of IP Multimedia System (IMS), AP represents access point, be Access Point), be that RGW reports handover information (as the basic deployment information of RGW (RGW@XX.COM.CN) to IMS, the MH essential information), IMS determines the SIP addressing information (as E-GGSN@YY.COM.CN) of the E-GGSN of the mobile communications network that participates in switching according to the handover information that reports, IMS also returns to RGW with the SIP addressing information of E-GGSN, and RGW utilizes the SIP addressing of E-GGSN to set up SIP session between RGW and the GGSN; E-GGSN has increased SIP B2B UA (back-to-back user agent) module and packet handler module on standard GGSN basis; RGW has increased SIP B2B UA module and packet handler module on standard wireless local area networks gateway basis; MH has increased two session layer user agents (UA:User Agent) function and data group filtration device module on standard mode mobile terminal basis, two session layer user agents refer to mode mobile terminal and support SIP (conversation initialized protocol) user agent (UA:UserAgent) in GPRS and the wlan network simultaneously, i.e. session layer user agent UA in the GPRS net
GPRS, the session layer user agent UA in the WLAN (wireless local area network)
WLAN
In another embodiment of the present invention, the WLAN that RGW provided has covered a less zone, RGW is by the detection to signal strength signal intensity, can judge dual-mode terminal at first and whether vertical switching will take place, so the present invention selects triggering and the control appliance of RGW as vertical switching fast, MH is the auxiliary equipment of quick vertical switching with E-GGSN.MH supports the session layer user agent of mobile radio communication and WLAN (wireless local area network), MH can set up the SIP session on the net at mobile radio communication and wireless local respectively, can be simultaneously on source network and the purpose network receiving media data, and utilize the packet filter module to filter out the duplicate packet data of being received.The SIP B2B UA module definition that is increased among RGW and the E-GGSN is: B2B UA is a logical node that receives request, handles request, and very similar with UAS, it keeps the state of " dialogue ", particularly " dialogue " state of its request of sending.(annotate: B2B UA and UAS definition see " Rosenberg J, Schulzrinne H, Camarillo G et al.SIP:Session Initiation Protocol.RFC3261 " for details).In RGW/GGSN, use the Record-Route field with Session Initiation Protocol directed outwards agency, guarantee that like this B2B UA can catch all " dialogue " information, B2B UA is coupled together media gateway and sip proxy server.The packet handler functions of modules that is increased among RGW and the E-GGSN is described below: the grouped data that the packet handler module is sent the opposite end sends on the MH by source network and purpose network; The packet handler module is filtered MH by the grouped data of source network and purpose network destined opposite end, abandon the number of repeated packet data.
RGW at first detects the incident that MH switches, and RGW is by the SIP addressing information of the E-GGSN of the mobile communications network of IMS acquisition participation switching, and RGW B2B UA initiates and set up the SIP session between RGW B2B UA and the E-GGSN B2B UA then.Utilize this session, for downlink data (should define to some extent in front), RGW in the handover source network or the packet handler on the E-GGSN are with packet copies and be transferred on the E-GGSN or RGW that switches in the purpose network, MH can be simultaneously accepts media data by E-GGSN or RGW on the RGW on the handover source network or E-GGSN, the switching purpose network like this, and MH utilizes packet filter to abandon the repeating data of being received; For upstream data (should define to some extent in front), MH can upload data to the opposite end by source network and purpose network, switch RGW in the purpose network or E-GGSN the upstream data of being received is transmitted to E-GGSN or RGW in the handover source network, E-GGSN in the handover source network or RGW can utilize packet handler to abandon the number of repeated packet data.
Switch finish after, MH utilizes SIP UA in the purpose network to set up SIP session with opposite equip. after switch the purpose network and receive stable media data flow, and switches SIP session and Media Stream between RGW and the GGSN.Concrete method is described below:
(1) RGW detects dual-mode terminal and will switch, and also has ongoing session on the dual-mode terminal;
(2) RGW is addressed to and the relevant E-GGSN of vertical switching by IMS, and the SIP session control of setting up between RGW and the E-GGSN connects; Utilize this SIP session, by the RGW in the handover source network or E-GGSN duplicate media stream on the E-GGSN or RGW that switch in the purpose network, E-GGSN in the purpose network or RGW can send this Media Stream to MH, MH can go up receiving media data from handover source network (RGW or E-GGSN) and purpose network (E-GGSN or RGW) simultaneously like this, guarantee that the media data that opposite equip. (CN) sends can not lose, the repetition media data that MH utilizes packet filter to abandon to be received;
(3) after MH received stable Media Stream from switching purpose network, MH sent Re-Invite to CN and invites, and purpose is that the SIP session is switched in the purpose network;
(4) after the Re-Invite signaling process finishes, MH sends the BYE signaling from switching the RGW or the GGSN of purpose network to the handover source network, and purpose is SIP session and the media stream duplication that stops on former network RGW or the GGSN;
(5) MH realizes the renewal of position by the registration in handover network;
(6) after the BYE signaling process finished, MH also stopped to accept media stream data from source network thereupon, finishes whole handoff procedure.
Specifically, fast vertical handoff method and device thereof and system have following technique effect between the mobile communications network of the present invention's proposition and the WLAN (wireless local area network).
(1) RGW takes the lead in detecting handover event as the switching controls nucleus equipment; Its advantage is that the response speed of detection handover event is fast;
(2) by single switching core control equipment---RGW controls handoff procedure, and the control signaling process is simple, and switch speed is fast, guarantees the session seamless switching;
(3) in handoff procedure, MH is receiving media data from source network and purpose network simultaneously, has guaranteed the integrality of media data;
(4) in handoff procedure, MH can send Re-Invite signaling and BYE signaling from the purpose network, has guaranteed that the stable of handoff procedure finish, and having reduced the decline that table tennis switches the media services quality that causes.
(5) this changing method is used in file equally and downloads, and reduces losing and retransmitting the assurance downloading efficiency of grouping.
(6) having the relation of disposing flexibly between RGW and the GGSN, can be to be in same management domain and different management domains, is suitable for having home network and the public hot spot region that WLAN covers.
Other features and advantages of the present invention will be set forth in the following description, and partly become apparent from specification, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of being write, claims and accompanying drawing.
Description of drawings
Fig. 1 is fast vertical switching flow figure;
Fig. 2 is fast vertical switching device shifter system diagram;
Fig. 3 is the switching model figure from WLAN to GPRS;
Fig. 4 is the switching model figure from GPRS to WLAN;
Fig. 5 is that the hand off signaling from WLAN to GPRS is realized figure;
Fig. 6 is that the hand off signaling from GPRS to WLAN is realized figure.
Embodiment
Below in conjunction with service the preferred embodiments of the present invention (handoff procedure between GPRS and the WLAN) are described, should state: preferred example in real time described herein only is used for description and interpretation the present invention, should not regard limitation of the present invention as.
In one embodiment of the invention, fast vertical handoff method and system between a kind of mobile communications network and the WLAN (wireless local area network) are provided.Wherein, described quick vertical switching system is the core controller that switches with RGW, and this RGW is used for detecting and the fast vertical switching controls flow process of triggering.Described quick vertical switching system also comprises mobile dual-mode terminal (MH), Wireless Local Area Network Gateway (RGW) and Gateway GPRS Support Node (E-GGSN).The described RGW of present embodiment increases SIP B2B UA functional module and packet handler functional module on existing RGW basis, similarly, the described GGSN of present embodiment also increases SIP B2B UA functional module and packet handler functional module on existing GGSN basis.The MH of present embodiment supports user agent (UA:User Agent) and the packet filter function in GPRS and the wlan network simultaneously.Related transmission and Control Network comprise the Internet and IP Multimedia System (IMS), and E-GGSN carries out SIP session addressing function in the network of relation to switching to need IMS to support RGW.The present invention uses above-mentioned function, and RGW and GGSN set up the pre-switch session in the handoff procedure, in advance by the purpose network to MH transmission of media data stream, guarantee in the vertical handover procedure that session is not interrupted, media data is not lost.
Fig. 1 describes the fast vertical switching flow figure of example of the present invention, with the basic principle of elaboration method.Concrete steps are as follows:
Step 102:RGW enters or leaves the WLAN coverage territory by the detection to the WLAN signal strength signal intensity to detect the GPRS/WLAN dual-mode terminal, obtains the basic triggering signal of vertical switching;
Step 104:RGW collects present session status, checks whether movable session connection is arranged;
Step 106: according to whether having movable session decision whether to carry out vertical fast the switching.If there is not active session, just directly vertically switch execution in step 110; If active session is arranged, with regard to execution in step 108;
Step 108: trigger and carry out vertical fast the switching by RGW, the switching model of concrete face is as follows described and signaling process is realized;
Step 110: upgrade GPRS/WLAN dual-mode terminal positional information, finish handoff procedure.
(1) switching model
(1) switching model from WLAN to GPRS
As shown in Figure 3, after RGW detected and is lower than the order of switching threshold or manual switchover with the MH wireless energy signal, the SIP B2B UA of RGW sent to GGSN B2B UA and has the INVITE signaling, and the INVITE signaling comprises all relevant informations of calling out in carrying out.The feedback signaling of INVITE will be taken back the SIP addressing information of E-GGSN, the packet handler on the B2B UA configuration RGW, and the grouped data that will send on " old " network interface is duplicated, and sends on " newly " network interface.When MH switching during, E-GGSN receives the signaling of the PDP context activation that MH sends, and just the data of duplicating is sent to MH.MH is by two interface transceive data, in case grouping arrives MH by new interface, E-GGSN just sends the INVITE signaling to CN, and this signaling has new SIP positional information.Carrying out session parameter subsequently consults again.Session parameter is consulted to finish again, the call information of the BYE end of message " old ".Last MH is registered to new location information on the attribution server.
(2) switching model from GPRS to WLAN
As shown in Figure 4, after RGW detects and enters the wireless coverage of RGW with MH, set up the safety of MH and RGW and trust alliance, MH is by the relevant information of registration issue current sessions, RGW B2B UA sends the INVITE that has the JOIN field to GGSNB2B UA, and the JOIN field comprises carries out middle all relevant informations of calling out.After RGW successfully adds session, the packet handler of configuration E-GGSN.Wherein on the medium down link, the GGSN duplication packets, the one tunnel directly is sent to MH by the GPRS link, and the RGW of leading up in addition is sent to MH.Line link main medium in handoff procedure in the media, the handoff procedure process is sent to the opposite end with the data on the GPRS link, abandons the ascending packet data of RGW by filter.When MH by the WLAN realization on/when downlink grouped transmitted, the process of beginning finishing switching: MH sent the Re-INVITE order to CN, upgrade positional information and carry out media negotiation again, after new session is set up, send BYE to GPRS network, finish " old " session, finish the switching overall process.Last MH is registered to new location information on the attribution server.
(2) hand off signaling flow process
Switch the overall process process shown in Fig. 5,6 based on the vertical fast of SIP.Before the switching, MH and CN have set up media session.Suppose that MH and CN are subordinated to same administrative domain, SIP URI is
MH@dsp.comWith
CN@dsp.comThe GPRS of MH, WLAN link UA are respectively: UA
GPRSAnd UA
WLANOther main relevant device has E-GGSN, P-CSCF, I-CSCF, S-CSCF, HSS/AAA.
(1) WLAN switches to GPRS is vertical fast
MH shifts out the WLAN coverage gradually, and MH starts the GPRS startup and adheres to and pdp context activation, simultaneously UA
GPRSBe in listening state.RGW is as the switching controls nucleus equipment, by the Invite signaling: have MH will switch to GPRS network, and carry CALL-IP, From tag and the To tag of session, and consult the GGSN of MH under at present with RGW.After the negotiation, RGW has born the function of media gateway again, and the packet copies and the filtration of active session medium can be provided, and E-GGSN adds session as B2B UA, has played the grouping acceptance and the forwarding capability of conversation media.Like this, descending medium become the two-way Media Stream by RGW, and one road Media Stream passes through UA
WLANWLAN " old " link of control transmits; Another road Media Stream passes through UA
GPRSGPRS " newly " link of control transmits.Link packet data that in case MH receives descending " newly ", one step of key that shows vertical switching finishes, MH triggers the re-Invite process subsequently, carry out the position upgrades and media negotiation to the CN place, after this process finishes, the conversation media of MH directly transmits between MH/E-GGSN/CN, no longer by RGW, and MH UA
WLANNaturally will finish no longer to control the session of medium by BYE message, remove the corresponding state on all UA.At last, on registrar, finish registration updating.
(2) GPRS switches to WLAN is vertical fast
MH moves into the WLAN coverage gradually, and MH obtains the IP address attached on the WLAN by DHCP.Pass through UA
GPRSTo WLAN advertise active session related information: CALL-IP, From tag and To tag.RGW obtains the active session relevant information.RGW adds session as the switching controls nucleus equipment by the INVITE signaling request that has the JOIN field.After RGW successfully adds session, the relevant packet handler of E-GGSN configuration, same: descending medium become the two-way Media Stream by GGSN, and one road Media Stream passes through UA
GPRSGPRS " old " link of control transmits; Another road Media Stream passes through UA
WLANWLAN " newly " link of control transmits.Link packet data that in case MH receives descending " newly ", one step of key that shows the vertical switching of piece number finishes, MH triggers the re-Invite process subsequently, carrying out the position with CN upgrades and media negotiation, after this process finishes, the conversation media of MH directly transmits between MH/E-GGSN/CN, no longer by RGW, and MH UA
WLANNaturally will finish no longer to control the session of medium by BYE message, remove the corresponding state on all UA.At last, on registrar, finish registration updating.
Claims (7)
1. vertical switching system fast between mobile radio communication and the WLAN (wireless local area network), comprise the mobile communications network of supporting fast vertical handoff functionality, the gateway GPRS node of supporting fast vertical handoff functionality, support the Wireless Local Area Network Gateway of fast vertical handoff functionality and support the mobile radio communication of fast vertical handoff functionality and the mode mobile terminal of WLAN (wireless local area network) based on IP Multimedia System;
Described support fast the gateway GPRS node of vertical handoff functionality comprise standard gateway GPRS node, the back-to-back user agent module of SIP and and the packet handler module; The vertical fast Wireless Local Area Network Gateway of switching of described support comprises basic radio network gateway module, the back-to-back user agent module of SIP, packet handler module, handover event detection module and switching controls center module, wherein said switching controls center module is used for when the handover event detection module detects handover event, sets up the SIP session described vertical fast the switching between radio network gateway and the quick vertical switching gateway GPRS node; Described mode mobile terminal comprises basic mode mobile terminal module, two sip user agent module and packet filtering module.
2. quick vertical switching system according to claim 1, it is characterized in that the mobile communications network based on IP Multimedia System of supporting fast vertical handoff functionality is to increase the SIP session addressing function of RGW to E-GGSN existing on based on the mobile communications network basis of IP Multimedia System.
3. quick vertical switching system according to claim 1, it is characterized in that, described pair of sip user agent module of described mode mobile terminal is used for setting up the SIP session on the net at mobile radio communication and wireless local respectively, and the while receiving block data, described packet filter is used to abandon the repeating data grouping of being received.
4. quick vertical switching system according to claim 1, described support be the SIP session between the back-to-back user agent module of SIP of the back-to-back user agent module of SIP of the Wireless Local Area Network Gateway of vertical handoff functionality Wireless Local Area Network Gateway that is used to initiate and set up the fast vertical handoff functionality of described support and the gateway GPRS node of supporting quick vertical handoff functionality fast.
5. quick vertical switching system according to claim 1, it is characterized in that, described packet copies module is used for medium replication, the medium that duplicated by described support fast vertical handoff functionality Wireless Local Area Network Gateway and described support fast the SIP session between the back-to-back user agent module of SIP of the gateway GPRS node of vertical handoff functionality be transferred to gateway GPRS node or Wireless Local Area Network Gateway the switching purpose network from the Wireless Local Area Network Gateway of handover source network or gateway GPRS node.
6. a fast vertical handoff method that utilizes the described quick vertical switching system of claim 1 comprises the following steps:
(1) Wireless Local Area Network Gateway detects dual-mode terminal and will switch, and also has ongoing service conversation on the dual-mode terminal;
(2) Wireless Local Area Network Gateway is addressed to and the relevant gateway GPRS node of vertical switching by IMS, and the SIP session control of setting up between Wireless Local Area Network Gateway and the gateway GPRS node connects; Utilize this SIP session, by the Wireless Local Area Network Gateway in the handover source network or gateway GPRS node duplicate media stream on the gateway GPRS node or Wireless Local Area Network Gateway that switch in the purpose network, gateway GPRS node or Wireless Local Area Network Gateway in the purpose network send this Media Stream to mode mobile terminal, like this mode mobile terminal can be simultaneously on handover source network and the purpose network receiving media data, guarantee that the media data that opposite equip. sends can not lose, simultaneously the mode mobile terminal repetition media data that utilizes packet filter to abandon to be received;
(3) after mode mobile terminal was received stable Media Stream from switching purpose network, mode mobile terminal sent Re-Invite to opposite equip. and invites, so that the SIP session is switched in the purpose network;
(4) after the Re-Invite signaling process finishes, mode mobile terminal sends the BYE signaling from switching the Wireless Local Area Network Gateway or the gateway GPRS node of purpose network to the handover source network, with the Wireless Local Area Network Gateway that stops former network or SIP session and the media stream duplication on the gateway GPRS node;
(5) mode mobile terminal is realized the renewal of position by the registration in handover network;
(6) after the BYE signaling process finished, mode mobile terminal also stopped to accept media stream data from source network thereupon, finishes whole handoff procedure.
7. fast vertical handoff method according to claim 6 is characterized in that, in the described step (2), the process that the described SIP session control of setting up between Wireless Local Area Network Gateway and the gateway GPRS node connects comprises:
(a) Wireless Local Area Network Gateway is reported handover information based on IP Multimedia System, and this handover information comprises basic deployment information of Wireless Local Area Network Gateway and mode mobile terminal essential information;
(b) determine and the SIP addressing information that switches relevant gateway GPRS node according to the handover information that reports based on IP Multimedia System;
(c) based on IP Multimedia System the SIP addressing information of gateway GPRS node is returned to Wireless Local Area Network Gateway, Wireless Local Area Network Gateway utilizes the SIP addressing of gateway GPRS node to set up SIP session between Wireless Local Area Network Gateway and the gateway GPRS node.
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| CN103428781A (en) * | 2012-05-17 | 2013-12-04 | 中兴通讯股份有限公司 | IP voice call switching method, system and user equipment |
| CN104601561A (en) * | 2014-12-31 | 2015-05-06 | 北京海尔广科数字技术有限公司 | Registration method of network, registration terminal, registration device and home network |
| CN106664246A (en) * | 2014-06-30 | 2017-05-10 | 日本电气株式会社 | Communication device, communication method, and program |
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| CN101222423A (en) * | 2006-10-20 | 2008-07-16 | 三星电子株式会社 | Apparatus and method for vertical handover in broadband wireless communication system |
| CN101483856A (en) * | 2009-02-18 | 2009-07-15 | 北京交通大学 | Vertical switching method based on mobile terminal under multi-channel synchronization detection |
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| CN103428781A (en) * | 2012-05-17 | 2013-12-04 | 中兴通讯股份有限公司 | IP voice call switching method, system and user equipment |
| CN103428781B (en) * | 2012-05-17 | 2018-03-02 | 中兴通讯股份有限公司 | A kind of method and system of IP voice call switching, user equipment |
| CN106664246A (en) * | 2014-06-30 | 2017-05-10 | 日本电气株式会社 | Communication device, communication method, and program |
| US10609157B2 (en) | 2014-06-30 | 2020-03-31 | Nec Corporation | Communication apparatus, communication method, and program |
| CN106664246B (en) * | 2014-06-30 | 2020-08-04 | 日本电气株式会社 | Communication device, communication method, and program |
| CN104601561A (en) * | 2014-12-31 | 2015-05-06 | 北京海尔广科数字技术有限公司 | Registration method of network, registration terminal, registration device and home network |
| CN104601561B (en) * | 2014-12-31 | 2018-06-19 | 海尔优家智能科技（北京）有限公司 | Register method, registration equipment and the domestic network system of network |
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