CN101801055A - Communication switching method among different networks and terminal equipment thereof - Google Patents
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Abstract
The invention relates to a communication switching method among different networks, which comprises the following steps of: sending a request for establishing a second link to a core network by a terminal through an access control device of a second network; and after completing the establishment of the second link, sending a request for releasing a first link to the terminal by the core network through an access control device in a first network. The invention has the advantages of providing and solving the technical problem of the processing of seamless switching of a multi-mode terminal between a WLAN (Wirele Local Area Network) network and a mobile wireless network in the prior art, and guarantees service quality and service experience of users during roaming. The invention provides a novel implementation system and method according to international standards of 3GPP (The 3rd Generation Partnership Project), 3GPP2, RFC (Request for Comments) and the like, which have easy implementation and capability of scale commercial popularization.
Description
[technical field]
The present invention relates to communication technical field, relate in particular to communication handover method and terminal equipment thereof between the heterogeneous networks.
[background technology]
Admittedly move fusion (FMC) technology is that the broadband advantage of fixed network and mobile network's mobile advantage are engaged, make the user use same UE (User Equipment) to be linked into core network via different access networks, and can under different access networks covers, move freely and switch, obtain complete business and consistent business experience.
The core net of indication of the present invention is the mobile core network of 3GPP tissue and 3GPP2 definition.The WLAN access technology of indication of the present invention comprises uses WiFi (802.11 series standard), WiMax (802.16 series standard) and bluetooth (Bluetooth) to be linked into the access way of broadband network.
When the user uses when supporting WLAN inserts and 2G/3G inserts multimode terminal, the user wishes can reduce professional use rate, and business all is to insert from the network of higher QoS assurance when guaranteeing that the user moves, and the use of user's business is unaffected in moving process.So just to having proposed actual switching demand between terminal and WLAN and mobile network.The general strategy that switches when realizing is high bandwidth and a low cost of considering the WLAN access network, and when the WLAN signal quality was better, terminal preferentially inserted wlan network, to reduce the load of mobile wireless access network network; When the WLAN signal can not satisfy operation quality requirement, terminal was transferred by mobile base station access mobile core network, to guarantee carrying out smoothly of communication.In order to guarantee the quality of handoff in the above-mentioned service switch process, promote user's business experience, necessarily require terminal and network to take corresponding measure such as radio network optimization etc., to satisfy the seamless switching demand of terminal between different access networks, reduce packet loss, improve handover success rate and quality of service.
Have not yet to see and use bimodulus or multimode terminal, can freely insert 2G/3G mobile wireless network and wlan network, and then the access mobile core network, and can between 2G/3G and WLAN access network, realize the commercial case of success of seamless switching.The seamless switching scheme mostly is based on MIP (mobile IP) realization between at present known heterogeneous network, requires to dispose in the network FA (external agent) and HA equipment such as (home agents), and is very high to the deployment and the change requirement of existing network.And support in the present existing core network that the equipment of MIP does not mostly also possess extensive commercial networking capability, the commerce of MIP business is disposed ripe not enough in other words.Follow-up along with the evolution of MIPv4 to MIPv6, realize that based on MIP also compatible IPv4/v6 dual stack will make the seamless switching between the xenogenesis access network realize becoming more complicated.Switching between 23.402 couples of 3GPP of IMS LTE related protocol such as 3GPP and non-3 GPP access network also is described and defines, and MIP and PMIP (proxy-mobile IP) technology that also is based on realizes that the specific implementation flow process is also in progressively improving and revising.
[summary of the invention]
Technical problem to be solved by this invention is, communication handover method and terminal equipment thereof between a kind of heterogeneous networks are provided, solve technical problem, the especially seamless switching between WLAN and mobile wireless access network network of terminal seamless switching between heterogeneous networks.
In order to address the above problem, the invention provides the communication handover method between a kind of heterogeneous networks, be used for will communicate by first link and core net at first network terminal switch to second network trunk and continue and communicate by letter, described first network is connected same core net with second network, comprising the steps: that terminal is sent to core net by the access control apparatus in second network sets up second link request, to set up the described second communication link between a described terminal and the core net in second network; After second link establishment finished, core net was sent the request that discharges first link by the access control apparatus in first network to terminal, with the described terminal that discharges preexist in first network and described first communication link between the core net.
As optional technical scheme, the described step of setting up the second communication link comprises the steps: further that the access control apparatus of terminal in second network sends and eats dishes without rice or wine to set up second link request; Access control apparatus in second network sends Access Network to core net and sets up second link request; The access control apparatus of core net in second network sends sets up replying of second link request; Access control apparatus in second network sends setting up replying of second link request to terminal, thereby the Business Stream of terminal is switched to second network from first network.
As optional technical scheme, the step of described release first communication link comprises the steps: that further the access control apparatus of core net in first network sends first link and discharge request; Access control apparatus in first network sends first link to terminal and discharges request; The access control apparatus of terminal in first network sends discharging replying of first link request; Access control apparatus in first network sends discharging replying of first link request to core net, thereby first link that communicates between terminal and the core net is discharged.
As optional technical scheme, the access control apparatus in described first network is mobile base station and base station controller, and the access control apparatus in described second network is the WLAN (wireless local area network) IAD.
As optional technical scheme, the access control apparatus in described first network is the WLAN (wireless local area network) IAD, and the access control apparatus in described second network is mobile base station and base station controller.
The present invention further provides a kind of terminal equipment that is used to implement said method, comprised application layer, adaptation layer, Drive Layer and physical layer, described Drive Layer comprises a plurality of driver modules, and described physical layer comprises a plurality of modulation modules.
As optional technical scheme, described Drive Layer comprises WLAN (wireless local area network) wireless network card driver module and 2G/3G data card driver module.
As optional technical scheme, described physical layer comprises wireless lan modem and 2G/3G data card modulator-demodulator.
The invention has the advantages that, proposed and solved prior art, ensured quality of service and business experience when the user roams handle the technical problem that multimode terminal is run into during seamless switching between wlan network and mobile wireless network.The WLAN that the present invention proposes and the system and method for the seamless switching between wireless network, only need in existing network, increase the WLAN IAD, to existing mobile core network without any other change demand, and deployment that can adaptive follow-up MIP, the roaming range that extends one's service.Adopt the present invention program, operator can release the FMC business fast, solve the switching problem between the xenogenesis access network in the FMC fused business, utilize the low-cost bandwidth of fixed network (WLAN wireless access) more fully, reduce the load of expensive wireless network, improve the wireless network covering quality, satisfy the growing Packet Service QoS demand of user.This invention has proposed novel realization system and method according to international standards such as 3GPP, 3GPP2, RFC, realizes simply, has the commercial ability of promoting of scale.
[description of drawings]
Accompanying drawing 1 is to the implementation step schematic diagram that shown in the accompanying drawing 3 is the communication handover method embodiment between the heterogeneous networks of the present invention;
It shown in the accompanying drawing 4 structural representation of terminal described in the terminal embodiment that communication handover method adopted between the heterogeneous networks of the present invention;
Accompanying drawing 5 is to the implementation step schematic diagram and the terminal structure schematic diagram that shown in the accompanying drawing 9 are one embodiment of the invention.
[embodiment]
Elaborate below in conjunction with the embodiment of accompanying drawing to communication handover method between the heterogeneous networks provided by the invention and terminal equipment thereof.
Provide the embodiment of the communication handover method between the heterogeneous networks of the present invention at first in conjunction with the accompanying drawings.Be the implementation step schematic diagram of the described changing method of this embodiment shown in the accompanying drawing 1, comprise: step S111, the access control apparatus of terminal in second network sends eats dishes without rice or wine to set up second link request; Step S112, the access control apparatus in second network sends Access Network to core net and sets up second link request; Step S113, the access control apparatus of core net in second network send and set up replying of second link request; Step S114, the access control apparatus in second network sends setting up replying of second link request to terminal, thereby the Business Stream of terminal is switched to second network from first network; Step S121, the access control apparatus of core net in first network send first link and discharge request; Step S122, the access control apparatus in first network send first link to terminal and discharge request; Step S123, the access control apparatus of terminal in first network send discharging replying of first link request; Step S124, the access control apparatus in first network sends discharging replying of first link request to core net, thereby first link that communicates between terminal and the core net is discharged.
The terminal that the described method of this embodiment is used for communicating by first link and core net at first network switches to that second network trunk is continuous communicates by letter, described first network is connected same core net with second network, step S111 is to make terminal to send to core net by the access control apparatus in second network to the essence of step S114 and sets up second link request, to set up the described second communication link between a described terminal and the core net in second network; Step S121 is after second link establishment finishes to the essence of step S124, core net is sent the request that discharges first link by the access control apparatus in first network to terminal, with the described terminal that discharges preexist in first network and described first communication link between the core net.
Communicating by letter and to switch through by other transferring equipment between above-mentioned terminal and network and the core net.
As a kind of execution mode, the access control apparatus in described first network is the WLAN (wireless local area network) IAD, and the access control apparatus in described second network is mobile base station and base station controller.Accompanying drawing 2 is depicted as implementation step schematic diagram in such cases.
Before said method is implemented, as a kind of embodiment preferred, can at end-probing behind mobile network and wlan network signal, just initiate registration from trend mobile network and WLAN, resident on mobile network and WLAN IAD (being designated hereinafter simply as WAG).And property performance period and network interaction, maintain the login state of network side.When terminal needs to initiate to switch by wireless signal measurement judgement, just no longer need to re-register, and directly the initiation incision is called out, and will significantly reduce handover delay like this.
(Point to Point Protocol PPP), is linked into core net by wlan network and WAG, sets up the PPP session to use peer-peer protocol between terminal and the core net.After the terminal decision is initiated to switch, by incision side joint networking control appliance is that mobile base station and base station controller are consulted newly-built the link with core net, receive after the link setup success message, keep original WLAN and WAG to go up the PPP session of carrying, and the PPP Business Stream is switched on the newly-built passage on mobile base station and the base station controller.Mobile base station and base station controller just can receive the downlink message of core net after receiving the response of core net link setup; After receiving the link setup response that terminal is returned, just can transmit the uplink message of terminal.Can reduce packet buffer and retransmission interval in the handoff procedure by above control mode.
After the success of incision side link setup, core net notice WAG discharges original link.The terminal upper-layer service is not also known the switching of bottom, as long as the PPP session is continuous, message being is just is being received and dispatched always.Bottom carries out buffer memory to sending unsuccessful message in handoff procedure.After receiving incision side link setup success message, will send unsuccessful message before this and resend.Access network control equipment is after receiving that link setup that core net issues is replied, if also do not receive the link setup success response of terminal, the message that can earlier core net be issued carries out buffer memory, is transmitted to terminal again receiving after the terminal link setup is replied.Can reduce packet loss in the handoff procedure by above control mode.
As another kind of execution mode, the access control apparatus in described first network is mobile base station and base station controller, and the access control apparatus in described second network is the WLAN (wireless local area network) IAD.Shown in the accompanying drawing 3 be the implementation step schematic diagram of above-mentioned situation, similar with last situation, repeat no more herein.
In other execution mode, terminal also can reside in the more access network simultaneously, and described network not only comprises various wireless networks, even also can include spider lines.For example connect the notebook computer that the local area network (LAN) netting twine also will have wireless network card or Bluetooth function simultaneously, can also adopt said method to be implemented in freely switching between cable network and the wireless network.
Consider that the construction of wlan network unit bandwidth and maintenance cost are well below mobile wireless networks such as 2G/3G.On the switch decision strategy, can implement WLAN and switch preference strategy.That is to say, when terminal detects the WLAN radio signal quality and satisfies the handoff threshold value and require,, also can consider preferentially business to be switched to wlan network even this moment, the 2G/3G radio signal quality was fine, reduce 2G/3G mobile network's load, improve user's business experience.
Next provide the embodiment of the terminal equipment of the communication handover method between the heterogeneous networks of the present invention in conjunction with the accompanying drawings.Be the logical construction schematic diagram of the described terminal equipment of this embodiment shown in the accompanying drawing 4, comprise application layer, adaptation layer, Drive Layer and physical layer.Application layer comprise application program (applicationprogram, APP) and the PPP dial-up program (RAS) of terminal, APP is used to finish the application layer protocol interface interchange of upper layer application business and access to mobile network and wlan network; Adaptation layer comprises virtual serial port driver module (Virtual Serial) and protocol adaptation module (Adapter), and the protocol adaptation module can be finished the processing of the message protocol encapsulation format of standard or customization; Drive Layer comprises that the WLAN (wireless local area network) wireless network card drives (WLAN Driver) module and the 2G/3G data card drives (2G/3G Datacard Driver) module; Physical layer comprises wireless lan modem (WLAN Modem) and 2G/3G data card modulator-demodulator (2G/3G Datacard Modem).
When the terminal that adopts said structure is implemented the described method of last embodiment, when the action of switching is terminal has been set up mobile core network via WAG by WLAN a ppp link, and when switching to the mobile network, the mode of operation of terminal is as follows: the terminal decision is initiated to switch, the APP layer calls the bottom instruction, is accomplished to the access of eating dishes without rice or wine of mobile wireless network by 2G/3G Datacard Modem; Eat dishes without rice or wine after link setup finishes, the APP layer will notify adaptation layer to finish the switching of driving interface module; Follow-up business flows to and reaches adaptation layer, and the selected 2G/3G Datacard of the context by adaptation layer during according to professional link setup drives the data message transmitting-receiving of finishing on the 2G/3GDatacard Modem.
When change action is terminal has been set up mobile core network via base station and base station controller by mobile wireless network a ppp link, and when switching to WLAN, the mode of operation of terminal is as follows: the terminal decision is initiated to switch, the APP layer calls the bottom instruction, is accomplished to the access of WAG by WLAN Modem; After terminal is finished to the link establishment of WAG, the APP layer will notify adaptation layer to finish the switching of driving interface module; After follow-up business flow to and reaches adaptation layer, the selected WLAN of the context by adaptation layer during according to professional link setup drove the data message transmitting-receiving of finishing on the WLAN Modem.
Next provide embodiments of the invention in conjunction with the accompanying drawings.
Present embodiment uses and carries the notebook computer of WiFi module, inserts the cdma wireless network interface card, by the PDSN network element of cdma network or wlan network access 3GPP2 mobile core network, realizes free seamless switching between the xenogenesis access network under the same PDSN.Notebook uses the Windows XP operating system of Microsoft.
Standard specification definition for 3GPP2 and RFC in this area all adopts English, for the normalized definition that makes following narration and standard adapts, therefore the description to interacting message all is the English narration of quoting in the standard specification definition of corresponding 3GPP2 and RFC in following narration and the accompanying drawing.
The Chinese implication of the English narration correspondence that below will adopt specifically, is as follows:
Assignment request: assignment request;
A11-Register Req:A11 interface register requirement;
A11-Register Reply:A11 interface registration response;
A11-Register Update:A11 interface register update;
The registration reply of A11-Register Ack:A11 interface;
Assignment Complete: domination is finished;
BS ACK Order: base station acknowledgement command;
CM Service Request: call business request;
Clear Request: remove request;
Clear Command: clear command;
Clear Complete: remove and finish;
LocationNotification: position informing;
LocationAssignment: the position is distributed;
LocationComplete: finish the position;
Origination: initial message;
TCH Setup: transmission channel is set up;
TCH Release: transmission channel discharges.
Concrete operation flow and terminal implementation procedure are as follows:
1WLAN switches to CDMA
Cdma network exists 1X and EVDO standard at present, below describes the operation flow that switches to these two kinds of standard networks from WLAN respectively.
1.1WLAN switch to 1X
Switch step as shown in Figure 5.Terminal has been set up the PPP session connection by WAG and PDSN.Satisfy behind the switching condition of CDMA 1X access network when terminal detects, terminal is initiated the switching to CDMA 1X, triggers the foundation of the Traffic Channel of eating dishes without rice or wine.After the network element of process BSC/PCF, MSC, PDSN was mutual, the service channel of terminal and PDSN equipment room was set up and is finished, and the PPP session successful switch between terminal and PDSN is to the cdma service passage.PDSN initiates the service channel release message to cutting out side network (WLAN), sends SIP BYE message to terminal after WAG receives, indication discharges resource and end session.Terminal discharges the Session Resources of wlan network.
1.2WLAN switch EVDO
Switch step as shown in Figure 6.Terminal has been set up the PPP session connection by WAG and PDSN.Satisfy behind the switching condition of CDMA DO when terminal detects, terminal is initiated the switching to CDMA DO, triggers the foundation of the Traffic Channel of eating dishes without rice or wine.After the network element of process RNC, PDSN was mutual, the service channel of terminal and PDSN equipment was set up and is finished, and the PPP session successful switch between terminal and PDSN is to the cdma service passage.PDSN initiates the service channel release message to cutting out side network (WLAN), sends SIP BYE message to terminal after WAG receives, indication discharges resource and end session.Terminal discharges the Session Resources of wlan network.
2CDMA switches to WLAN
2.11x switch WLAN
Switch step as shown in Figure 7.Terminal has been set up the PPP session at CDMA 1X network.Terminal detects and satisfies behind the switching condition of WLAN, if having not yet registered then terminal is initiated the SIP registration to WAG.Be in login state after succeeding in registration or before switching, terminal is initiated the SIP INVITE to WAG and is set up calling, finishes Signalling exchange between WAG and PDSN, sets up service channel.After terminal was set up successfully via WAG to the service channel of PDSN, the PPP session between terminal and PDSN switched on the bearer path that wlan network provides.Follow-up PDSN initiates resource to cdma network and discharges, and is discharged the session connection and the channel resource of cdma wireless network by CDMA access network equipment notice terminal.
2.2DO switch to WLAN
Switch step as shown in Figure 8.Terminal has been set up the PPP session at CDMA DO network.Terminal detects and satisfies behind the switching condition of WLAN, if having not yet registered then terminal is initiated the SIP registration to WAG.When being in login state after succeeding in registration or before switching, terminal is initiated the SIP INVITE to WAG and is set up calling, finishes Signalling exchange between WAG and PDSN, sets up service channel.After terminal was set up successfully via WAG to the service channel of PDSN, the PPP session between terminal and PDSN switched on the bearer path that wlan network provides.Follow-up PDSN initiates resource to cdma network and discharges, and is discharged the session connection and the channel resource of cdma wireless network by CDMA access network equipment notice terminal.
3 terminals realize describing
Terminal realizes that based on Windows XP operating system, terminal realizes framework as shown in Figure 9.
3.1 initial p PP sets up process:
Terminal is established to the access service passage of WAG by the SIP instruction, and in the NDIS WANMINIPORT (adaptation layer that notebook computer WAN drives, wherein NDIS is Network DriverInterface Specification, the network-driven interface specification) on set up data message route and control channel.
Follow-up terminal is initiated the PPP dial-up connection by the MMI dialer, drives by WAN and mails to NDISWAN MINIPORT.By service message route and the control channel that this module is determined according to the SIP signaling procedure, select suitable physical layer equipment (WLAN network interface card or mobile data card) that the PPP message is dealt into network.
The data message that network returns is via physical layer network interface card or MODEM, and after the Drive Layer such as NDIS WAN MINIPORT and NDIS WAN, the ICP/IP protocol stack of process system sends to upper layer application.
Terminal is just attempted registration after detecting CDMA signal and WLAN signal automatically, after the endpoint registration success, initiates periodic registration and network side automatically and keeps the login state of terminal at network side alternately.
3.2 service switchover flow control process:
WLAN->CDMA：
CDMA link setup message is issued NDIS WAN MINIPORT by 2G/3G MODEM, sets up user's face context thereon.After the link setup success, NDIS WAN MINIPORT and 2G/3G MODEM transmit passage and set up.Follow-up business stream is received and is sent out through 2G/3G MODEM.
CDMA->WLAN：
Link setup message between WAG and the terminal is undertaken setting up user's face context by SIP at NDIS WAN MINIPORT alternately by the SIP application layer on NET CARD, NDIS WAN MINIPORT and upper strata.After the link setup success, follow-up business stream is received and is sent out through WLAN NET CARD.
Can realize that by said process the PPP session in the handoff procedure keeps, thereby realize the professional free seamless switching of terminal between WLAN and 2G./3G wireless access network.
4 performance of handoffs indexs
Realize the actual test result of seamless switching based on the foregoing description:
CDMA switches to WLAN average delay 120ms
WLAN switches to CDMA average delay 750ms
Above-mentioned handover delay is meant that initiating switching command from business function module on the terminal to Drive Layer begins to receiving that cutting sidelinks sets up the time of being experienced till the response.
Under the stable situation of network environment, handover success rate can reach 100% between CDMA and WLAN.Under the situation of optimizing the handover success judgment condition, above-mentioned handover delay can also continue to shorten.
More than switch index and can satisfy the user fully the operation quality requirement in the handoff procedure.When the user moves in the use business perception less than the generation of switching.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (8)
1. the communication handover method between the heterogeneous networks, be used for will communicate by first link and core net at first network terminal switch to second network trunk and continue and communicate by letter, described first network is connected same core net with second network, it is characterized in that, comprises the steps:
Terminal is sent to core net by the access control apparatus in second network and is set up second link request, to set up the described second communication link between a described terminal and the core net in second network;
After second link establishment finished, core net was sent the request that discharges first link by the access control apparatus in first network to terminal, with the described terminal that discharges preexist in first network and described first communication link between the core net.
2. the communication handover method between the heterogeneous networks according to claim 1 is characterized in that, the described step of setting up the second communication link further comprises the steps:
The access control apparatus of terminal in second network sends eats dishes without rice or wine to set up second link request;
Access control apparatus in second network sends Access Network to core net and sets up second link request;
The access control apparatus of core net in second network sends sets up replying of second link request;
Access control apparatus in second network sends setting up replying of second link request to terminal, thereby the Business Stream of terminal is switched to second network from first network.
3. the communication handover method between the heterogeneous networks according to claim 1 is characterized in that, the step of described release first communication link further comprises the steps:
The access control apparatus of core net in first network sends first link and discharges request;
Access control apparatus in first network sends first link to terminal and discharges request;
The access control apparatus of terminal in first network sends discharging replying of first link request;
Access control apparatus in first network sends discharging replying of first link request to core net, thereby first link that communicates between terminal and the core net is discharged.
4. according to the communication handover method between any described heterogeneous networks of claim 1 to 3, it is characterized in that, access control apparatus in described first network is mobile base station and base station controller, and the access control apparatus in described second network is the WLAN (wireless local area network) IAD.
5. according to the communication handover method between any described heterogeneous networks of claim 1 to 3, it is characterized in that, access control apparatus in described first network is the WLAN (wireless local area network) IAD, and the access control apparatus in described second network is mobile base station and base station controller.
6. a terminal equipment that is used to implement the described method of claim 1 comprises application layer, adaptation layer, Drive Layer and physical layer, it is characterized in that, described Drive Layer comprises a plurality of driver modules, and described physical layer comprises a plurality of modulation modules.
7. terminal equipment according to claim 6 is characterized in that, described Drive Layer comprises WLAN (wireless local area network) wireless network card driver module and 2G/3G data card driver module.
8. terminal equipment according to claim 6 is characterized in that, described physical layer comprises wireless lan modem and 2G/3G data card modulator-demodulator.
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Application publication date: 20100811 |