CN103067994A - Method for switching wireless terminal between two kinds of wireless networks and system thereof - Google Patents
Method for switching wireless terminal between two kinds of wireless networks and system thereof Download PDFInfo
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- CN103067994A CN103067994A CN2011103174641A CN201110317464A CN103067994A CN 103067994 A CN103067994 A CN 103067994A CN 2011103174641 A CN2011103174641 A CN 2011103174641A CN 201110317464 A CN201110317464 A CN 201110317464A CN 103067994 A CN103067994 A CN 103067994A
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Abstract
The invention discloses a method for switching a wireless terminal between two kinds of wireless networks and a system thereof. The method comprises the following steps: maintaining a point-to-point protocol session between the wireless terminal and a packet data serving node via a first link of a first wireless network; establishing a second link between the wireless terminal and the packet data serving node through a second wireless network; switching the point-to-point protocol session between the wireless terminal and the packet data serving node to the second link. Through maintaining the point-to-point protocol session of the wireless terminal via the first wireless network, when the wireless terminal establishes the second link in the second wireless network, a negotiation establishment request of the point-to-point protocol session is not initiated and the point-to-point protocol session is switched to the second link so as to avoid service data transmission interruption brought by wireless network switching.
Description
Technical field
The present invention relates to wireless communication technology, relate in particular to a kind of method and system that wireless terminal is switched between two kinds of wireless networks.
Background technology
Development along with wireless communication technology, code division multiple access (Code Division MultipleAccess, CDMA) technology comprises CDMA 1X and CDMA 1X EVDO (Evolution DataOnly), becomes one of wireless communication technology that the most extensively adopts at present.Wherein, CDMA 1X technology is as the phase I of CDMA2000, and is can voice-over professional, also can loaded packet data, realize both for the user provides traditional voice service, the data service of end-to-end packet transfer mode also is provided for the user, the access of the Internet is provided.CDMA 1X EVDO technology be to CDMA 1X in the enhancements that provides aspect the data service, it is to aim at HRPD (high rate packet data) to transmit and the CDMA2000 control interface technology of optimal design, its maximum transmission rate reaches 2Mbps.Separately networking of CDMA 1X EVDO, also can with the CDMA1X mixed networking to remedy the deficiency of CDMA 1X on the high-speed packet data service providing capability.
On the other hand, WLAN (wireless local area network) (Wireless Local Area Networks, WLAN) is a kind of important solutions that broadband network connects as another important branch of field of wireless.IEEE is that WLAN (wireless local area network) has been formulated the IEEE802.11 standard, and this standard has greatly promoted development and the application of WLAN (wireless local area network).802.11 series standard in main standard comprise 802.11a, 802.11b and 802.11g standard, wherein, the maximum data transmission rate of 802.11b standard reaches 11Mbps, the maximum data transmission rate of 802.11a and 802.11g standard can reach 54Mbps.
Cdma network and WLAN respectively have advantage.That cdma network covers is wide, mobility is high and WLAN (wireless local area network) only covers regional area.But it is lower than using the cdma network expenses of surfing Internet to use the WLAN (wireless local area network) online, even a lot of place can provide free WLAN (wireless local area network).This is so that the fusion of cdma network and WLAN (wireless local area network) becomes the trend of radio network technique development.
At present, the scheme of supporting two kinds of wireless networks and two kinds of wireless networks being carried out unified certification has been arranged.The user is in the zone of two kinds of wireless network signals coverings, can use the wireless terminal of supporting two kinds of network signals, select wherein a kind of wireless network as access way, by the unified certification client of installing on the wireless terminal, through using the wireless network accessing Internet of having selected after access authentication or the authentication.
Wireless terminal can also under the state that accesses a kind of wireless network, be realized the switching to another kind of wireless network.Switch between two kinds of wireless networks under the access state for solving wireless terminal, simple IP (Simple IP) framework provides a solution.Yet, in based on the changing method under the simple IP framework.When wireless terminal in the situation that accessed a kind of wireless network, when switching to another kind of wireless network, with peer-peer protocol (Point to Point Protocol, the PPP) session of disconnection of wireless terminal and current wireless network, discharge the IP address that has obtained.Then, after wireless terminal accesses another kind of wireless network, obtain new IP address, rebulid again the peer-peer protocol session, recover the transmission of business datum.Be packaged with the upper-layer service data in the peer-peer protocol session data, therefore, in the process of above switching, the interruption of peer-peer protocol session has caused the wireless terminal business data transmission to be interrupted, and can't realize the seamless switching of wireless terminal between two kinds of wireless networks.
Summary of the invention
What the present inventor found to exist in the above-mentioned prior art can't realize the seamless switching problem of wireless terminal between two kinds of wireless networks, has proposed a kind of new technical scheme.
An object of the present invention is to provide a kind of method and system that makes wireless terminal seamless switching between two kinds of wireless networks.
Carry out in the handoff procedure of wireless network at wireless terminal, by keeping wireless terminal via the first link of the first wireless network and the peer-peer protocol session between the packet data serving node PDSN.Behind the second link of in second wireless network, setting up between wireless terminal and the PDSN, peer-peer protocol session between wireless terminal and the PDSN is switched to the second link, the peer-peer protocol session data that is packaged with the upper-layer service data that will soon transmit by the first wireless network switches in the second network and transmits, and has realized the continuous transmission of business datum.
According to an aspect of this aspect, provide a kind of be used to making wireless terminal switch to the method for second wireless network from the first wireless network, the method comprises:
Keep wireless terminal to pass through via the first link of the first wireless network and the peer-peer protocol session between the PDSN;
Set up the second link between this wireless terminal and the PDSN by second wireless network;
Peer-peer protocol session between this wireless terminal and the PDSN is switched to this second link.
Preferably, after the peer-peer protocol session is switched to the second link, also comprise: disconnect the first link.
Preferably, this first wireless network is WLAN (wireless local area network), and this second wireless network is Code Division Multiple Access (CDMA) network.
Preferably, this cdma network is CDMA 1X network, and the step of setting up the second link comprises: initiate connection request by this wireless terminal to base station controller BSC and Packet Control Function entity PCF in the CDMA 1X network;
Set up service connection between the moving exchanging center MSC in PCF and CDMA 1X network;
Setting up Traffic Channel between this wireless terminal and PCF is connected;
Setting up wireless network between PCF and PDSN is connected with packet network RP interface.
Preferably, this cdma network is CDMA 1X EVDO network, and the step of setting up the second link comprises:
Initiate connection request by this wireless terminal to the radio network control entity RNC in the cdma network;
Setting up the RP interface between RNC and PDSN is connected;
Setting up Traffic Channel between terminal and RNC is connected.
Preferably, the step that disconnects the first link comprises:
This PDSN notice WLAN (wireless local area network) IAD WAG disconnection of wireless local area network (LAN) is connected;
Disconnect WAG and be connected with WLAN (wireless local area network) between the wireless terminal, and WAG is connected with WLAN (wireless local area network) between the PDSN.
Preferably, this first wireless network is cdma network, and this second wireless network is WLAN (wireless local area network).
Preferably, the step of setting up the second link comprises:
Send registration message by this wireless terminal to the WAG in the WLAN (wireless local area network), and initiate to set up packet switching PS territory connection request to WAG;
Setting up the RP interface between WAG and PDSN is connected;
Between WAG and this wireless terminal, connect.
Preferably, this cdma network is CDMA 1X network, and the step that disconnects the first link comprises:
Make PCF in the PDSN notice CDMA 1X network disconnect with this PDSN between the RP interface set up be connected;
The Traffic Channel that disconnects between the MSC in PCF and the CDMA 1X network is connected;
Disconnect being connected between PCF and the RP, and being connected between PCF and this wireless terminal.
Preferably, cdma network is CDMA 1X EVDO network, and the step that disconnects the first link comprises:
Make RNC in the PDSN notice CDMA 1X EVDO network disconnect with this PDSN between the RP interface set up be connected;
Disconnect being connected between RNC and the RP, and being connected between RNC and the wireless terminal.
Preferably, before the step of setting up the second link, also comprise:
By AUC this wireless terminal is carried out access authentication.
According to another aspect of this aspect, a kind of system that makes wireless terminal switch to second wireless network from the first wireless network also is provided, this system comprises:
The session holding device is used for keeping wireless terminal to pass through via the first link of the first wireless network and the peer-peer protocol session between the PDSN;
The link establishment device is for the second link of setting up by second wireless network between wireless terminal and the PDSN;
Switching device shifter is used for the peer-peer protocol session between wireless terminal and the PDSN is switched to the second link.
Preferably, this switched system also comprises:
The first link disconnecting apparatus is used for disconnecting the first link after switching device shifter switches to the second link with the peer-peer protocol session between wireless terminal and the PDSN.
Preferably, this first wireless network is WLAN (wireless local area network), and this second wireless network is Code Division Multiple Access (CDMA) network; Perhaps, this first wireless network is Code Division Multiple Access (CDMA) network, and this second wireless network is WLAN (wireless local area network).
An advantage of the present invention is, owing to keeping wireless terminal via the first link of the first wireless network and the peer-peer protocol session between the PDSN, therefore, when wireless terminal switches to second wireless network, wireless terminal keeps original IP address, and no longer initiates the negotiation foundation request of peer-peer protocol session.After in second wireless network, setting up the second link between wireless terminal and the PDSN, peer-peer protocol session between wireless terminal and the PDSN is switched to the second link, being about to wireless terminal had the peer-peer protocol session data to switch in the second network to transmit, kept the continuous transmission of peer-peer protocol session data by what the first wireless network transmitted originally.Owing to being packaged with the upper-layer service data in the peer-peer protocol session data, therefore, business datum is transmitted continuously between wireless terminal and the wireless network, avoided interrupting because wireless network switches the business data transmission of bringing, realized the seamless switching of wireless terminal from a kind of wireless network to another kind of wireless network.
Description of drawings
By referring to the detailed description of accompanying drawing to exemplary embodiment of the present invention, it is clear that further feature of the present invention and advantage thereof will become.
The accompanying drawing that consists of the part of specification has been described embodiments of the invention, and is used for explaining principle of the present invention together with the description.
With reference to accompanying drawing, according to following detailed description, can more be expressly understood the present invention, wherein:
Fig. 1 illustrates the schematic network structure of using the embodiment of the invention;
Fig. 2 is the schematic flow sheet of the first embodiment of changing method of the present invention;
Fig. 3 is the signaling process figure among the second embodiment of changing method of the present invention;
Fig. 4 is the signaling process figure among the 3rd embodiment of changing method of the present invention;
Fig. 5 is that the second embodiment and the 3rd embodiment of changing method of the present invention realizes switching the signaling process figure that disconnects the first link afterwards;
Fig. 6 is the signaling process figure of the 4th embodiment of changing method of the present invention;
Fig. 7 is the signaling process figure that disconnects the first link after the 4th embodiment of changing method of the present invention realizes switching;
Fig. 8 is the signaling process figure that disconnects the first link after the 5th embodiment of changing method of the present invention realizes switching;
Fig. 9 is the structural representation of the first embodiment of switched system of the present invention.
Embodiment
Describe various exemplary embodiment of the present invention in detail now with reference to accompanying drawing.It should be noted that: unless specify in addition, the parts of setting forth in these embodiments and the positioned opposite of step do not limit the scope of the invention.
Below be illustrative to the description only actually of at least one exemplary embodiment, never as any restriction to the present invention and application or use.
May not discuss in detail for the known technology of person of ordinary skill in the relevant, method and apparatus, but in suitable situation, technology, method and apparatus should be regarded as authorizing the part of specification.
In all examples with discussing shown here, it is exemplary that any occurrence should be construed as merely, rather than as restriction.Therefore, other example of exemplary embodiment can have different values.
It should be noted that: represent similar terms in similar label and the letter accompanying drawing below, therefore, in case be defined in a certain Xiang Zaiyi accompanying drawing, then in accompanying drawing subsequently, do not need it is further discussed.
Below in conjunction with embodiment, describe changing method and system according to the embodiment of the invention in detail.
Fig. 1 illustrates the schematic network structure of using the embodiment of the invention.In the scheme that cdma network and WLAN (wireless local area network) based on the simple IP framework merge, the user can based on the CDMA card, use the wireless terminal that the unified certification client is installed to select a kind of wireless network to be connected to the Internet as access way.
For example, when the user uses CDMA 1X network insertion the Internet, wireless terminal is by CDMA 1X base station transceiver (the Base TransceiverStation in the CDMA 1X network, BTS) 102, base station controller (Base Station Controller, BSC)/Packet Control Function entity (Packet Control Function, PCF) 103 and packet data serving node (Packet Data Serving Node, PDSN) 112 accessing Internets 113.Usually, BSC and PCF can be set together, and finish the wireless channel control function relevant with Packet data service with cooperation.
When the user used CDMA 1X EVDO network insertion the Internet, wireless terminal was by BTS104, radio network controller (RadioNetwork Controller, RNC) 105 and the PDSN112 accessing Internet 113 of CDMA 1X EVDO network.
When the user uses the wireless local network accessing Internet, wireless terminal by with WLAN (wireless local area network) in access point (Access Point, AP) 106, access control point (AccessController, AC)/base station controller (Base Station Controller, BSC) 107, WLAN (wireless local area network) IAD (WLAN Access Gateway, WAG) 108 and PDSN112 network node accessing Internet 113.
In addition, in the scheme of cdma network and WLAN (wireless local area network) fusion, can also use unified Access Network Authentication Authorization and account server (AccessNetwork-Authentication, Accounting, Authorization, AN-AAA) 109, attaching position register/authorization center (Home LocationRegister/Authentication Centre, HLR/AC) 110 and (the Mobile Switching Center of mobile switching centre, MSC)/mobile soft switch center (MobileSwitching Center emulation, MSCe) 111 finish to the access wireless terminal unified authentication and authentication.
Changing method
The first embodiment
Fig. 2 is the schematic flow sheet of changing method the first embodiment of the present invention.Below with reference to shown in Figure 2, describe the changing method that the present embodiment provides in detail.
At first, at step S201, keep wireless terminal to pass through via the first link of the first wireless network and the peer-peer protocol session between the PDSN.
Wireless terminal and has been set up the first link between the first wireless network under the state that accesses the first wireless network, and play the peer-peer protocol session by this first link establishment between this wireless terminal and the PDSN.Under the framework of simple IP, no matter be cdma network, or WLAN (wireless local area network), all use peer-peer protocol as link protocol.At TCP/IP (Transmission Control Protocol/Internet Protocol, TCP/IP) in the agreement, peer-peer protocol is the data link layer protocol that synchronous modulation connects, and a kind of tunneling that provides at point to point connect transmission multi-protocol data bag is provided.As data link layer protocol, be packaged with the business datum on upper strata in the peer-peer protocol session data.Keep wireless terminal to pass through via the first link of the first wireless network and the peer-peer protocol session between the PDSN, thereby guaranteed that business datum can continue to be transmitted by the first link.
Then, at step S202, set up the second link between wireless terminal and the PDSN by second wireless network.
In the scheme of cdma network and WLAN (wireless local area network) fusion, wireless terminal has the access function of two kinds of networks, therefore, in the first link that keeps between wireless terminal and the first wireless network, can set up the second link between wireless terminal and the PDSN by second wireless network.The process of setting up of the second link in the second wireless network and the first link that keeps the first wireless network are processes independently, therefore, in this process, have still kept the continuous transmission of business datum.
Then, at step S203, the peer-peer protocol session between wireless terminal and the PDSN is switched to the second link.
Because wireless terminal is keeping and PDSN between the peer-peer protocol session, and keep original IP address.Therefore, after finishing via the second link establishment of second wireless network between wireless terminal and the PDSN, peer-peer protocol session between wireless terminal and the PDSN is switched to this second link, thereby so that wireless terminal is no longer initiated the peer-peer protocol session negotiation to PDSN.After peer-peer protocol session between wireless terminal and the PDSN switched to the second chain, can transmit by the second link immediately so that be packaged with the peer-peer protocol session data of upper-layer service data, thereby realize the continuous transmission of business datum.
In the above embodiment of the present invention, the first wireless network can be cdma network, second wireless network can be WLAN (wireless local area network), perhaps, the first wireless network is WLAN (wireless local area network), second wireless network is cdma network, and the changing method that the first embodiment provides all can be realized the seamless switching of wireless terminal between these two kinds of wireless networks.
Be respectively the situation of above-mentioned heterogeneous networks for the first wireless network and second wireless network, successively the changing method under the different situations be introduced below by the second embodiment to the five embodiment.
The second embodiment and the 3rd embodiment describe the method that wireless terminal switches from WLAN (wireless local area network) to cdma network in detail.Wherein, the second embodiment is the method that wireless terminal is switched from WLAN (wireless local area network) to CDMA 1X network, and the 3rd embodiment is the method that wireless terminal is switched from WLAN (wireless local area network) to CDMA 1X EVDO network.
The 4th embodiment and the 5th embodiment describe the method that wireless terminal switches from cdma network to WLAN (wireless local area network) in detail.Wherein, the 4th embodiment is the method that wireless terminal is switched from CDMA 1X network to WLAN (wireless local area network), and the 5th embodiment is the method that wireless terminal is switched from CDMA1X EVDO network to WLAN (wireless local area network).
The second embodiment
In a second embodiment, wireless terminal in the situation that accessing WLAN switch to CDMA 1X network.Fig. 3 is the signaling process figure that wireless terminal switches to CDMA 1X network among the second embodiment from WLAN (wireless local area network).Below with reference to shown in Figure 3, the method flow of the second embodiment is described.
Need to prove, in CDMA 1X network, BSC and PCF can close and be made as a network entity usually, therefore signaling process between BSC and the PCF is not shown in Fig. 3, those skilled in the art should be understood that the Signalling exchange that carries out according to standard between BSC and PCF.In the following description, represent that with BSC/PCF BSC and PCF close the network element of establishing.
In addition, those skilled in the art should be understood that the A10, the A11 that occur in this manual represent Radio Access Network (Radio Access Network, RAN) defined A interface in the interoperability standard (Inter Operation Specification, IOS).RAN mainly is responsible for foundation, maintenance and the release of wireless channel, carries out RRM and mobile management.The A10 interface is used for service data transmission, and the A11 interface is used for command transmitting.
At first, at step S310, keep wireless terminal to pass through via the first link of WLAN (wireless local area network) and the peer-peer protocol session between the PDSN.
Wireless terminal comprises AP, AC/BSC by the first link in the WLAN (wireless local area network), and WAG, and sets up the peer-peer protocol session between the PDSN.When wireless terminal switches to the CDMA1X network, continue maintenance via the peer-peer protocol session of the first link.Be packaged with the upper-layer service data in the peer-peer protocol session data, thereby guaranteed that business datum continues to transmit by the first link between the WLAN (wireless local area network).
Then, at step S320, set up the second link between wireless terminal and the PDSN by CDMA 1X network.
The method of setting up the second link between wireless terminal and the PDSN by CDMA 1X network specifically comprises: initiate the mutual of connection request by wireless terminal to the BSC/PCF in the CDMA 1X network.Subsequently, set up service connection between the moving exchanging center MSC in BSC/PCF and CDMA 1X network.Next, setting up Traffic Channel between wireless terminal and BSC/PCF connects.Next, setting up wireless network between PCF and PDSN is connected with packet network RP interface.As shown in Figure 3, can comprise following signaling process.
Step S321, wireless terminal send originating information (Origination DBS=1) to BSC on the access channel of interface aloft.
Step S322 after BSC receives originating information, sends the base station to wireless terminal and confirms instruction message (BS ACK Order).
Step S323, BSC structure connection management business request information (ConnectManagement Service Request) sends to MSC.
Step S324, MSC sends assignment request message (Assignment Request) with request BSC distributing radio resource to BSC.
Step S325 sets up the mutual of Traffic Channel (TrafficChannel, TCH) between wireless terminal and the BSC/PCF.The mutual signaling process according to standard of setting up Traffic Channel between wireless terminal and the BSC/PCF carries out.
Step S326, PCF sends A11 registration request (A11-Registration-Request) message to PDSN, and request is set up A10 and is connected.
Step S327, PDSN accept A10 and connect the request of foundation, return A11 registration reply message (A11-Registration-Reply) to PCF.
Step S328, radio traffic channel and land circuit all set up and fully after the intercommunication, BSC sends assignment to MSC and finishes message (Assignment Complete).
So far, finish by CDMA 1X network and set up the second link between wireless terminal and the PDSN.
Then, at step S330, the peer-peer protocol session between wireless terminal and the PDSN is switched to the second link of setting up in the CDMA 1X network.
In the process of setting up the second link, wireless terminal keeping always and PDSN between peer-peer protocol session and original IP address.After between wireless terminal and PDSN, finishing via the second link establishment of CDMA 1X network, the peer-peer protocol session between wireless terminal and the PDSN is switched to this second link, thereby no longer initiate the peer-peer protocol session negotiation to PDSN.Be about to original peer-peer protocol session data by the first link transmission in the WLAN (wireless local area network), switch to by transmitting on the second link in the CDMA 1X network.In handoff procedure, kept the continuous transmission of business datum.
The 3rd embodiment
In the 3rd embodiment, wireless terminal in the situation that accessing WLAN switch to CDMA 1XEVDO network.Fig. 4 is the signaling process figure that wireless terminal switches to CDMA 1X EVDO network among the 3rd embodiment from WLAN (wireless local area network).Below with reference to shown in Figure 4, the method flow of the 3rd embodiment is described.
Step S410 keeps wireless terminal to pass through via the first link of WLAN (wireless local area network) and the peer-peer protocol session between the PDSN.Step S410 is identical with step S310, and the description with reference to above-mentioned steps S310 repeats no more here.
Step S420 sets up the second link between wireless terminal and the PDSN by CDMA 1X EVDO network.
The method of setting up the second link between wireless terminal and the PDSN by CDMA 1X EVDO network specifically comprises: initiate connection request by wireless terminal to the radio network control entity RNC in the CDMA 1X EVDO network.Subsequently, setting up the RP interface between RNC and PDSN is connected.Next, setting up Traffic Channel between terminal and RNC is connected.As shown in Figure 4, can comprise following signaling process.
Step S421, wireless terminal sends connection request message (ConnectionRequest) to RNC, and request connects.
Step S422, RNC sends login request message (A11-Registration-Request) to PDSN, and request is set up A10 and is connected.
Step S423, PDSN send registration reply message (A11-Registration-Reply) to RNC after setting up the A10 connection, confirm to set up A10 and connect.
Step S424, RNC sends Traffic Channel Assignment message (Traffic ChannelAssignment) to terminal, forward channel and pilot tone Active Set that the indication wireless terminal need to be monitored.
Step S425, wireless terminal switch to the forward channel of RNC appointment, and return Traffic Channel to RNC and finish message (TCH Establishment), reverse traffic channel before setting up.
So far, set up the second link between wireless terminal and the PDSN by CDMA 1X EVDO network.
Step S430 switches to the peer-peer protocol session between wireless terminal and the PDSN the second link of setting up in the CDMA 1X EVDO network.
In the process of setting up the second link, wireless terminal keeping always and PDSN between peer-peer protocol session and original IP address.After between wireless terminal and PDSN, finishing via the second link establishment of CDMA 1X EVDO network, the peer-peer protocol session between wireless terminal and the PDSN is switched to this second link, thereby no longer initiate the peer-peer protocol session negotiation to PDSN.Be about to original peer-peer protocol session data by the first link transmission in the WLAN (wireless local area network), switch to use in the CDMA 1X EVDO network and transmit on the second link.In handoff procedure, kept the continuous transmission of business datum.
In the second embodiment and the 3rd embodiment, finish wireless terminal by WLAN (wireless local area network) to the switching of cdma network, further, can also the disconnection of wireless terminal via the first link of WLAN (wireless local area network), to reduce taking Internet resources.
The method that disconnects the first link comprises: PDSN notice WLAN (wireless local area network) IAD WAG disconnection of wireless local area network (LAN) is connected.Next, disconnect WAG and be connected with WLAN (wireless local area network) between the wireless terminal, and WAG is connected with WLAN (wireless local area network) between the PDSN.
Fig. 5 is that the second embodiment and the 3rd embodiment of changing method of the present invention realizes switching the signaling process figure that disconnects the first link afterwards.Below with reference to shown in Figure 5, the signaling process that disconnects via the first link of WLAN (wireless local area network) is described.
Step S501, PDSN initiates A11 registration update message (A11-Registration Update) to WAG, and notice WAG discharges the A10 link.
Step S502, WAG sends A11 registration reply message (A11-Registration ACK) to PDSN.
Step S503, WAG sends byebye message (BYE) to wireless terminal.
Step S504, wireless terminal receive that the backward WAG of byebye message replys approval message (200OK).
Step S505, WAG sends A11 login request message (A11-Registration Request) to PDSN, and the life span in this message is set to 0 (lifetime=0).
Step S506 after PDSN receives aforementioned messages, replys A11 registration reply message (A11-Registration Reply).Close A10 link between PDSN and the WAG.
Abovely in conjunction with the second embodiment and the 3rd embodiment the method that wireless terminal is switched to cdma network by WLAN (wireless local area network) has been described.The below describes the 4th embodiment and the 5th embodiment in detail, and these two embodiment have introduced wireless terminal by the execution mode of cdma network to wireless lan handover method.
The 4th embodiment
In the 4th embodiment, wireless terminal switches to WLAN (wireless local area network) in the situation that connect CDMA 1X network.Fig. 6 is the signaling process figure that wireless terminal switches to WLAN (wireless local area network) among the 4th embodiment from CDMA 1X network.Below with reference to shown in Figure 6, the method flow of the 4th embodiment is described.
Step S610 keeps wireless terminal to pass through via the first link of CDMA 1X network and the peer-peer protocol session between the PDSN.
Wireless terminal comprises CDMA 1XBTS by the first link in the CDMA 1X network, BSC/PCF, and set up the peer-peer protocol session between the PDSN.When wireless terminal switches to WLAN (wireless local area network), continue maintenance via the peer-peer protocol session of the first link.Be packaged with the upper-layer service data in the peer-peer protocol session data, thereby guaranteed that business datum continues to transmit by the first link between the CDMA 1X network.
Step S620 sets up the second link between wireless terminal and the PDSN by WLAN (wireless local area network).
The method of setting up the second link between wireless terminal and the PDSN by WLAN (wireless local area network) specifically comprises: send registration message by wireless terminal to the WAG in the WLAN (wireless local area network), and initiate to set up packet switching PS territory connection request to WAG.Next, setting up the RP interface between WAG and PDSN is connected.Next, between WAG and wireless terminal, connect.In the present embodiment, SIP (SessionInitiation Protocol) agreement that can Application standard between wireless terminal and the WAG.Such as Fig. 6, can comprise following signaling process.
Step S621, wireless terminal sends SIP registration message (Register) to WAG, comprises the information such as authentication arithmetic that wireless terminal is supported in this message.
After step S622, WAG received this registration message, the authentication of carrying out Session Initiation Protocol between beginning and wireless terminal and the authentication server was mutual.
Step S623, after the Session Initiation Protocol authentication, WAG sends message (200OK) to wireless terminal, and notice wireless terminal authentication is passed through, and finishes registration.
Step S624, wireless terminal send to WAG and invite (Invite) message, and expression will be initiated business datum
Step S625, WAG sends A11 login request message (A11-Registration-Request) to the services addresses of PDSN, requires to set up A10 and connects.
Step S626, PDSN returns A11 registration reply message (A11-Registration-Reply) to WAG.
Step S627, WAG sends message (200OK) to wireless terminal, notifies to the PDSN link and sets up.
Step S628, wireless terminal sends acknowledge message (ACK) to WAG.
So far, finish by WLAN (wireless local area network) and set up the second link between wireless terminal and the PDSN.
Step S630 switches to the peer-peer protocol session between wireless terminal and the PDSN the second link of setting up in the WLAN (wireless local area network).
In the process of setting up the second link, wireless terminal keeping always and PDSN between peer-peer protocol session and original IP address.After between wireless terminal and PDSN, finishing via the second link establishment of WLAN (wireless local area network), the peer-peer protocol session between wireless terminal and the PDSN is switched to this second link, thereby no longer initiate the peer-peer protocol session negotiation to PDSN.Be about to original peer-peer protocol session data by the first link transmission in the CDMA 1X network, switch to use in the WLAN (wireless local area network) and transmit on the second link.Cross in the handoff procedure at this, kept the continuous transmission of business datum.
In the changing method that the 4th embodiment provides, after the peer-peer protocol session is switched to WLAN (wireless local area network), can also comprise the first link that disconnects in the CDMA 1X network.Specifically, at first, make PCF in the PDSN notice CDMA 1X network disconnect with this PDSN between the RP interface set up be connected.Next, the Traffic Channel that disconnects between the MSC in PCF and the CDMA 1X network is connected.Next, the Traffic Channel that disconnects between the MSC in PCF and the CDMA 1X network is connected.According to above method, the signaling process that disconnects the first link of setting up via CDMA 1X network is described below with reference to Fig. 7.
Step S701, PDSN sends A11 registration update message (A11-Registration Update) to PCF/BSC, and notice PCF discharges the A10 link.
Step S702, PCF sends A11 registration reply message (A11-Registration ACK) to PDSN.
Step S703, BSC/PCF send to MSC and remove request message (Clear Request);
Step S704, MSC beams back clear command message (ClearCommand) to BSC/PCF.
Step S705 discharges the TCH link between BSC/PCF and the wireless terminal;
Step S706, BSC/PCF send to remove to MSC and finish message (ClearComplete), and notice MSC removes to process and finishes.
Step S707, PCF sends A11 login request message (A11-Registration Request) to PDSN, and the life span in this message is set to 0 (lifetime=0).
Step S708 after PDSN receives aforementioned messages, replys A11 registration reply message (A11-Registration Reply).Close A10 link between PDSN and the WAG.
The 5th embodiment
In the 5th embodiment, wireless terminal switches to WLAN (wireless local area network) in the situation that accessed CDMA 1X EVDO network.Concrete steps comprise:
Step S810 keeps wireless terminal to pass through via the first link of CDMA 1X EVDO network and the peer-peer protocol session between the PDSN.
Wireless terminal comprises CDMA1X EVDO BTS by the first link in the CDMA 1X EVDO network, RNC, and set up the peer-peer protocol session between the PDSN.When wireless terminal switches to WLAN (wireless local area network), continue maintenance via the peer-peer protocol session of the first link.Be packaged with the upper-layer service data in the peer-peer protocol session data, thereby guaranteed that business datum continues to transmit by the first link between the CDMA 1X EVDO network.
Step S820 sets up the second link between wireless terminal and the PDSN by WLAN (wireless local area network).
The method of setting up the second link between wireless terminal and the PDSN by WLAN (wireless local area network) specifically comprises: send registration message by wireless terminal to the WAG in the WLAN (wireless local area network), and initiate to set up packet switching PS territory connection request to WAG.Next, setting up the RP interface between WAG and PDSN is connected.Next, between WAG and wireless terminal, connect.
The 5th embodiment is wireless terminal in the situation that accessed the method that CDMA 1X EVDO network switches to WLAN (wireless local area network), the 4th embodiment is wireless terminal in the situation that accessed the method that CDMA 1X network switches to WLAN (wireless local area network), in these two embodiment, set up the method for the second link between wireless terminal and the PDSN and similar by WLAN (wireless local area network).Therefore referring among the 4th embodiment to the description of step S720, repeat no more here.
Step S830 switches to the peer-peer protocol session between wireless terminal and the PDSN the second link of setting up in CDMA 1X EVDO network.
In the process of setting up the second link, wireless terminal keeping always and PDSN between peer-peer protocol session and original IP address.After between wireless terminal and PDSN, finishing via the second link establishment of WLAN (wireless local area network), the peer-peer protocol session between wireless terminal and the PDSN is switched to this second link, thereby no longer initiate the peer-peer protocol session negotiation to PDSN.Be about to original peer-peer protocol session data by the first link transmission in the CDMA 1X EVDO network, switch to by transmitting on the second link in the WLAN (wireless local area network).In handoff procedure, kept the continuous transmission of business datum.
In the 5th embodiment, after the peer-peer protocol session is switched to WLAN (wireless local area network), can also comprise the first link that disconnects in the CDMA 1X EVDO network.Specifically, the step that disconnects the first link comprises: make RNC in the PDSN notice CDMA 1X EVDO network disconnect with this PDSN between the RP interface set up be connected.Next, disconnect being connected between RNC and the RP, and being connected between RNC and the wireless terminal.
According to above method, below with reference to shown in Figure 8, the signaling process that disconnects the first link of setting up via CDMA 1XEVDO network is described:
Step S801, PDSN sends A11 registration update message (A11-Registration Update) to RNC, and notice PCF discharges the A10 link, and notice RNC discharges the A10 link.
Step S802, RNC sends A11 registration reply message (A11-Registration ACK) to PDSN.
Step S803, RNC sends A11 login request message (A11-Registration Request) to PDSN, and the life span in this message is set to 0 (lifetime=0).
Step S804 after PDSN receives aforementioned messages, replys A11 registration reply message (A11-Registration Reply), closes A10 link between PDSN and the RNC.
After step S805, wireless terminal and RNC carry out release connection mutual, release connection.
In the various embodiments described above, may need to consider whether the wireless terminal that is access in has the lawful authority of access second wireless network, therefore, before the step of setting up the second link, can also comprise by AUC wireless terminal is carried out access authentication, finish second wireless network to the authentication of wireless terminal.Those skilled in the art should be understood that the method for authentication can be carried out according to WLAN (wireless local area network) or the relevant standard of CDMA.Only have by after the authentication of second wireless network to wireless terminal, could in second wireless network, set up the second link between wireless terminal and the PDSN.
Switched system
The first embodiment
A kind of specific embodiment below with reference to Fig. 9 introduction and the corresponding switched system of changing method provided by the invention.
Fig. 9 is the structural representation of switched system the first embodiment of the present invention.The switched system that this embodiment provides can be used in the present invention the above-mentioned method that makes wireless terminal switch to second wireless network from the first wireless network.
Make wireless terminal comprise session holding device 901, link establishment device 902 and switching device shifter 903 from the system 900 that the first wireless network switches to second wireless network.
Session holding device 901 is used for keeping wireless terminal to pass through via the first link of the first wireless network and the peer-peer protocol session between the PDSN.
The second embodiment
Corresponding for the embodiment of the embodiment description of changing method with earlier in respect of figures 5, Fig. 7 and Fig. 8, in another kind of switched system embodiment, further, can also comprise the first link disconnecting apparatus (not shown), be used for after switching device shifter switches to the second link with the peer-peer protocol session between wireless terminal and the PDSN, disconnecting the first link.
For above two kinds of switched systems that embodiment provides, the first wireless network can be WLAN (wireless local area network), and second wireless network can be Code Division Multiple Access (CDMA) network, perhaps, the first wireless network can be Code Division Multiple Access (CDMA) network, and second wireless network can be WLAN (wireless local area network).
So far, method and formed semiconductor device according to manufacturing semiconductor device of the present invention have been described in detail.For fear of covering design of the present invention, details more known in the field are not described.Those skilled in the art can understand how to implement technical scheme disclosed herein fully according to top description.
May realize in many ways method and system of the present invention.For example, can realize method and system of the present invention by any combination of software, hardware, firmware or software, hardware, firmware.The said sequence that is used for the step of method only is in order to describe, and the step of method of the present invention is not limited to above specifically described order, unless otherwise specify.In addition, in certain embodiments, can be the program that is recorded in the recording medium with the invention process also, these programs comprise for the machine readable instructions that realizes the method according to this invention.Thereby the present invention also covers the recording medium that storage is used for the program of executive basis method of the present invention.
Although by example specific embodiments more of the present invention are had been described in detail, it should be appreciated by those skilled in the art, above example only is in order to describe, rather than in order to limit the scope of the invention.It should be appreciated by those skilled in the art, can in the situation that do not depart from the scope of the present invention and spirit, above embodiment be made amendment.Scope of the present invention is limited by claims.
Claims (14)
1. method that makes wireless terminal switch to second wireless network from the first wireless network comprises:
Keep described wireless terminal to pass through via the first link of described the first wireless network and the peer-peer protocol session between the packet data serving node PDSN;
Set up the second link between described wireless terminal and the described PDSN by described second wireless network;
Peer-peer protocol session between described wireless terminal and the described PDSN is switched to described the second link.
2. method according to claim 1 is characterized in that, after described peer-peer protocol session is switched to described the second link, also comprises:
Disconnect described the first link.
3. method according to claim 2 is characterized in that, described the first wireless network is WLAN (wireless local area network), and described second wireless network is Code Division Multiple Access (CDMA) network.
4. method according to claim 3 is characterized in that, described cdma network is CDMA 1X network, and the described step of setting up the second link comprises:
Initiate connection request by described wireless terminal to base station controller BSC and Packet Control Function entity PCF in the CDMA 1X network;
Set up service connection between the moving exchanging center MSC in described PCF and described CDMA 1X network;
Setting up Traffic Channel between described wireless terminal and described PCF is connected;
Setting up wireless network between described PCF and described PDSN is connected with packet network RP interface.
5. method according to claim 3 is characterized in that, described cdma network is CDMA 1X EVDO network, and the described step of setting up the second link comprises:
Initiate connection request by described wireless terminal to the radio network control entity RNC in the cdma network;
Setting up the RP interface between described RNC and described PDSN is connected;
Setting up Traffic Channel between described terminal and described RNC is connected.
6. method according to claim 3 is characterized in that, the step of described disconnection the first link comprises:
Make PDSN notify described WLAN (wireless local area network) IAD WAG disconnection of wireless local area network (LAN) to connect;
Disconnect described WAG and be connected with WLAN (wireless local area network) between the described wireless terminal, and described WAG is connected with WLAN (wireless local area network) between the described PDSN.
7. method according to claim 1 is characterized in that, described the first wireless network is cdma network, and described second wireless network is WLAN (wireless local area network).
8. method according to claim 7 is characterized in that, the described step of setting up the second link comprises:
Send registration message by described wireless terminal to the WAG in the described WLAN (wireless local area network), and initiate to set up packet switching PS territory connection request to described WAG;
Setting up the RP interface between described WAG and described PDSN is connected;
Between described WAG and described wireless terminal, connect.
9. method according to claim 7 is characterized in that, described cdma network is CDMA 1X network, and the step of described the first link of described disconnection comprises:
Make described PDSN notify PCF in the described CDMA 1X network disconnect with this PDSN between the RP interface set up be connected;
The Traffic Channel that disconnects between the MSC in described PCF and the described CDMA 1X network is connected;
Disconnect being connected between described PCF and the described RP, and being connected between described PCF and the described wireless terminal.
10. method according to claim 7 is characterized in that, described cdma network is CDMA 1X EVDO network, and the step of described the first link of described disconnection comprises:
Make described PDSN notify RNC in the described CDMA 1X EVDO network disconnect with this PDSN between the RP interface set up be connected;
Disconnect being connected between described RNC and the described RP, and being connected between described RNC and the described wireless terminal.
11. each described method is characterized in that according to claim 1-10, before the described step of setting up the second link, also comprises:
By AUC described wireless terminal is carried out access authentication.
12. a system that makes wireless terminal switch to second wireless network from the first wireless network comprises:
The session holding device is used for keeping described wireless terminal to pass through via the first link of described the first wireless network and the peer-peer protocol session between the PDSN;
The link establishment device is for the second link of setting up by described second wireless network between described wireless terminal and the described PDSN;
Switching device shifter is used for the peer-peer protocol session between described wireless terminal and the described PDSN is switched to described the second link.
13. system according to claim 12 is characterized in that, also comprises:
The first link disconnecting apparatus is used for disconnecting described the first link after described switching device shifter switches to described the second link with the peer-peer protocol session between described wireless terminal and the described PDSN.
14. according to claim 12 or 13 described systems, it is characterized in that,
Described the first wireless network is WLAN (wireless local area network), and described second wireless network is Code Division Multiple Access (CDMA) network; Perhaps
Described the first wireless network is Code Division Multiple Access (CDMA) network, and described second wireless network is WLAN (wireless local area network).
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