CN102638854B - Dual transfer mode switching method and universal access network controller - Google Patents

Abstract

The invention discloses a method for switching dual transfer modes between a universal access network and other universal access networks. A universal access network controller establishes a user data link for a circuit domain and a packet domain for a terminal simultaneously and processes a switching process of the circuit domain and the packet domain related to the same terminal. The invention provides the universal access network controller applicable to the method. By the method, the mobile terminal capable of performing circuit domain and packet domain services simultaneously can freely roam on a wireless core network through different access technologies, and the mobility and service experience of a user are improved.

Description

Dual-transmission mode switching method and general access network controller

Technical field

The present invention relates to mobile communication technology field, be specifically related to dual-transmission mode switching method and general access network controller.

Background technology

In mobile communication network, Access Network is as the bridge between terminal use and core switching network, and its ability to communicate directly affects the experience of user to Information Mobile Service.Along with the development of low coverage wireless communication technique, it, with the advantage of high access bandwidth and low communication cost, more and more comes into one's own.Based on low coverage wireless communication technique exempting to authorize frequency range to provide the mode of wireless access to popularize just rapidly, in local even metropolitan area, deposit with conventional wireless Access Network.Therefore, conventional wireless Access Network, the Access Network (GERAN:GSM EDGE Radio Access Network) of such as universal mobile telecommunications system (UMTS:Universal Mobile Telecommunications System) grounding wireless access network (UTRAN:UMTSTerrestrial Radio Access Network) and global system for mobile communications (GSM:Global Systemfor Mobile communications) and enhanced data rates version (EDGE:Enhanced Datarate for GSM Evolution) thereof and employing exempt to authorize the seamless switching between the mobile universal access network (GAN:Generic Access Network) accessing (UMA:Unlicensed Mobile Access) and roaming, become quite concerned hot technology.

In GAN network, mobile terminal is connected to general access network controller (GANC:Generic Access Network Controller) by general access IP network (Generic Access IP Network) and carries out communication, and GANC is equivalent to the base station sub-system (BSS:Base Station Subsystem) of GERAN community.Wherein general access IP network provides WAP (wireless access point).In whole wireless network, generally GANC is configured to a cellular cell in a Route Area or lane place, this makes it possible to realize the switching between GAN and other Access Networks and roaming.

At present, support that the terminal of GAN can carry out separately the switching of circuit domain (CS:Circuit Switched) or packet domain (PS:Packet Switched) business between GAN and the cellular cell adopting other Access Networks.Such as, when the terminal of carrying out CS or PS business in GAN finds that link-quality reduces, when reaching handover triggering condition, other Access Network cellular cells being configured to adjacent area can be cut, such as GERAN community; Equally, when the terminal of carrying out CS or PS business in GERAN finds that GAN link-quality is good, when reaching handover triggering condition, also GAN community can be cut.

In the invention process, inventor finds prior art, and at least there are the following problems: when terminal carries out CS and PS business in GERAN or UTRAN simultaneously, when being namely in double-transmission mode (DTM:Dual Transfer Mode) state, if need the switching proceeding to GAN, also do not provide corresponding at present and perform flow process and control strategy, possible result is: handoff failure; Or only carry out CS switching, PS business is suspended; Or only carry out PS switching, CS business is suspended.No matter there is which kind of situation, all compromise the service quality (QoS:Quality of Service) of business, reduce the business experience of user.

Summary of the invention

The embodiment of the present invention provides a kind of method can carrying out DTM switching between GAN and other Access Networks.Wherein, comprise from the method for other Access Networks incision GAN: terminal sends and handovers information to source wireless access network, and described handover information comprises the appointment to the target universal access network GAN community that needs are switched to; Source wireless access network judges that described terminal is in double-transmission mode DTM state, circuit domain handover preparation request information and packet domain handover preparation request information is sent to the general access network controller GANC of described target GAN cell; Described target GANC is the user data link that described terminal sets up for circuit domain and packet domain according to described handover preparation request information, and returns switching preparation object information to described source wireless access network; Source wireless access network prepares object information according to described switching and sends switching command to described terminal; The user data link being used for circuit domain and packet domain set up described in circuit domain business and packet switch domain service switch to according to described switching command by described terminal respectively.

The method cutting other Access Networks from GAN comprises: source GANC judges that terminal exists the user data link for circuit domain and packet domain simultaneously, circuit domain handover preparation request information and packet domain handover preparation request information is sent to the wireless access network of selected Target cell; Described target radio access network is that described terminal is carried out two transmission channel resources and reserved according to described handover preparation request information, and returns to switch and prepare object information to described source GANC; Described source GANC prepares object information according to described switching and sends switching command to described terminal; The two transmission channels distributed described in circuit domain business and packet switch domain service switch to according to described switching command by described terminal respectively.

The embodiment of the present invention also provides a kind of general access network controller, comprises transmission unit, bi-mode control unit and switch control unit; Described transmission unit, for being provided for the user data link of circuit domain and packet domain for terminal; Described bi-mode control unit is that same terminal is set up or discharges the user data link for circuit domain and packet domain for controlling described transmission unit according to the instruction of described switch control unit; Described switch control unit comprises incision control unit and cuts out control unit; Described incision control unit, the circuit domain handover preparation request information to same terminal sent for the treatment of core-network side and packet domain handover preparation request information, indicate described bi-mode control unit to be the user data link that described terminal sets up for circuit domain and packet domain, and return switching preparation object information to core-network side; Describedly cut out control unit, for judging that terminal exists the user data link for circuit domain and packet domain simultaneously, transtation mission circuit territory handover preparation request information and packet domain handover preparation request information are to core-network side; Receive the switching that returns of core-network side and prepare object information, send switching command to terminal, described terminal sets up for the user data link of circuit domain and packet domain to indicate described bi-mode control unit to be released to.

The embodiment of the present invention adopts by general access network controller simultaneously for terminal sets up the user data link being used for circuit domain and packet domain, and to the method that the switching flow of the circuit domain relevant to same terminal and packet domain processes, make the mobile terminal simultaneously carrying out circuit domain and packet switch domain service, can by different access technologies, at the online free-roaming of wireless core, improve user mobility and business impression.

Accompanying drawing explanation

Fig. 1 is the embodiment of the present invention one DTM changing method schematic flow sheet;

Fig. 2 is that of the embodiment of the present invention one method realizes signaling process schematic diagram;

Fig. 3 is the embodiment of the present invention two DTM changing method schematic flow sheet;

Fig. 4 is the embodiment of the present invention three DTM changing method schematic flow sheet;

Fig. 5 is the embodiment of the present invention four DTM changing method schematic flow sheet;

Fig. 6 is the embodiment of the present invention five DTM changing method schematic flow sheet;

Fig. 7 is that of the embodiment of the present invention five method realizes signaling process schematic diagram;

Fig. 8 is the embodiment of the present invention six DTM changing method schematic flow sheet;

Fig. 9 is the embodiment of the present invention seven DTM changing method schematic flow sheet;

Figure 10 is the embodiment of the present invention eight general access network controller structural representation;

Figure 11 is the embodiment of the present invention nine general access network controller structural representation;

Figure 12 is the embodiment of the present invention ten general access network controller structural representation;

Figure 13 is the embodiment of the present invention 11 general access network controller structural representation.

Also by reference to the accompanying drawings the embodiment of the present invention is described in further detail below by embodiment.

Embodiment

Embodiments provide the method that general access double-transmission mode switches (GAN DTM Handover), GANC is simultaneously for terminal sets up the user data link being used for circuit domain and packet domain, as Generic Access Circuit link (GA-CSR Connection) and general access packet transmission channel (GA-PSRTransport Channel) etc., and hand-off process is carried out to CS and the PS business of same terminal, process type comprises incision GAN and cuts out two aspects from GAN.The embodiment of the present invention also provides the general access network controller being applied to above-mentioned general access DTM changing method.Below respectively the method and apparatus of the embodiment of the present invention is described in detail.

Embodiment one, one are by other Access Networks (RAT, Radio Access Technology) be switched to the DTM changing method of GAN, other Access Networks can be GERAN or UTRAN, suppose that other Access Networks are GERAN in the present embodiment, method flow as shown in Figure 1, comprising:

A1, terminal send and handover information to source wireless access network, and be BSS in GERAN/UTRAN network, this handover information comprises the appointment to the target GAN cell that needs are switched to;

When supporting the travelling carriage of GAN to be in GERAN community, can constantly attempt finding GAN network, until find GAN service, perform the register flow path of GANC.When after successful registration on a GANC, for the terminal of GAN Network Priority type (GAN-preferred), trigger by the switching of GERAN to GAN normally because found GAN network; For the terminal of GERAN/UTRAN Network Priority type (GERAN/UTRAN-preferred), then may because the channel quality of current GERAN cell be reduced to a certain degree and triggers switching; Because the terminal in the present embodiment is in the state (i.e. DTM state) of carrying out circuit domain and packet switch domain service simultaneously, the terminal therefore in GERAN can carry out performance measurement to judge whether initiating to switch according to the time slot used one of CS business and PS business or both.

Usual terminal can adopt the following two kinds mode notification source BSS to need to be switched to certain GAN community:

If what the GAN community of an endpoint registration was included in GERAN community, terminal current place faces in district's list, terminal can send cell measurement reporting to source BSS as handover information, using the GAN community of endpoint registration as best cell in this cell measurement reporting.Source BSS judges the switching needing to carry out from GERAN community to GAN community according to measurement report.

Two, terminal also directly can send packet cell change notice (PCCN:Packet Cell ChangeNotification) message to source BSS as handover information, and this cell change comprises alternatively community, the registered target GAN cell of terminal in notifying.Source BSS judges whether to need to carry out the switching from GERAN community to GAN community according to cell change notice.

A2, source BSS judge to need triggering to be in the terminal switch of DTM state to GAN community, then CS handover preparation request information and PS handover preparation request information being sent to the GANC as switching target, carrying out switching and preparing;

According to existing system framework, usual CS handoff preparation phase relevant information is by the circuit switched service node in core net, and such as mobile switching centre (MSC:Mobile Switching Center) forwards; PS handoff preparation phase relevant information is by the Packet Service service node in core net, such as service general grouping service wireless (GPRS, General Packet Radio Service) support node (SGSN, Serving GPRSSupport Node) forwards; GANC can use identical with BSS with interface that is core net, and as A interface and Gb Interface, therefore MSC and SGSN can as the forwarding carrying out above-mentioned handoff preparation phase information carrying out the DTM in GERAN and switching;

A3, target GANC are the user data link that terminal sets up for circuit domain and packet domain according to the handover preparation information received, and return switching preparation object information to source BSS;

In switching set-up procedure, CS handover preparation request information and PS handover preparation request information may forward via two equipments of the core network respectively, and therefore GANC can take different processing policies.Following three kinds of modes are provided in the present embodiment:

One, target GANC adopts the mode of carrying out Resourse Distribute respectively according to corresponding handover preparation request information, namely, be namely that terminal is set up for the user data link of circuit domain according to this information after receiving CS handover preparation request information, such as executive circuit link Establishing process is that terminal sets up Generic Access Circuit link; Be namely that terminal is set up for the user data link of packet domain according to this information after receiving PS handover preparation request information, such as performing packet transmission channel activation process is that terminal sets up general access packet transmission channel.For simplicity, be that the user data link being used for circuit domain and packet domain that same terminal is set up is collectively referred to as general access double-transmission mode channel (GA-RC DTM Channel) below by GANC.

Two, according to existing specification, source BSS, when initiating DTM and switching, can carry the mark of carrying out DTM switching in the CS handover preparation request information of transmission and PS handover preparation request information; Therefore, target GANC also can adopt such strategy, namely, after receiving any one handover preparation request information, as long as judge that this handover preparation request information switches mark with DTM, target GANC thinks that the current DTM that switches to switches, and just sets up GA-RC DTM channel for corresponding terminal.The flow process of concrete foundation according to the description in mode one, can be carried out order and sets up; Also a flow process can be used to set up CS and PS Traffic Channel by GANC, for terminal sets up general access double-transmission mode channel simultaneously.

Three, target GANC also can adopt such strategy, after receiving CS or the PS handover preparation request information with DTM switching mark, target GANC thinks that the current DTM that switches to switches, need the handover preparation request information waiting for that another is relevant to same terminal, after two handover preparation request information all receive, perform the foundation of general access double-transmission mode channel (GA-RC DTM Channel) again.Waiting process can use timer to monitor, if after timer expiry, does not receive whole handover preparation request information yet, can select to proceed to switch or cancel to switch.

Target GANC sends CS territory respectively switching after completing the foundation of GA-RC DTM channel prepares the switching preparation object information in object information and PS territory to source BSS, shows that handoff preparation phase completes.CS and PS switches the mark preparing to include DTM switching in object information.The switching in two territories prepares object information and forwards respectively by MSC and SGSN equally.

A4, source BSS prepare object information according to the switching that target GANC returns and send switching command to terminal;

Because terminal can when being registered to GAN community, the system message issued by GANC has known the information required for DTM switching, as cell ID, routing area/location mark etc., and do not use the radio channel information of GERAN, therefore relevant information and some optional cells of wireless channel can be comprised in the switching command that BSS issues again, certainly, comprise and also can.

A5, terminal proceed to the switching of target GANC according to the switching command that source BSS issues, and respectively CS business and PS business are switched to the GA-RC DTM channel that target GANC has set up, use GA-RC DTM channel to carry out data transmit-receive;

After terminal proceeds to the switching of GANC or simultaneously, forward GAN mode of operation to, safeguard Radio Resource (RR:Radio Resource) layer in CS territory and PS territory, i.e. Generic Access Circuit resource layer (GA-CSR:Generic Access Circuit Switched Resources) and general access grouping resources layer (GA-PSR:Generic Access Packet Switched Resources) simultaneously.In CS territory, the service radio resource layer (Serving RR) providing Radio Resource to serve is transformed into GA-CSR, activate mobile management (MM:MobilityManagement) Service Access Point between layer and GA-CSR (SAP:Service Access Point), GA-CSR state becomes Generic Access Circuit resource single user state (GA-CSR-DEDICATED); In PS territory, GA-PSR obtains GPRS radio link layer (the RLC GRR of wireless spread-spectrum technology (RLC:Radio Link Control); GRR:GPRS Radio Resources) and the control of all GPRS Mobility Management Radio Resource Service Access Point (GMMRR SAP), GA-PSR state becomes general access grouping resources state of activation (GA-PSR-ACTIVE).After the conversion in above-mentioned CS territory and PS territory all completes, namely terminal enters GA-RC DTM state;

In addition, with reference to existing switching flow, after terminal successful switch, also can perform the subsequent operation of handover success, comprise:

A6, terminal send handover success message to target GANC, can comprise location area/routing area lastest imformation in this message;

A7, target GANC upgrade to MSC executing location district after receiving the handover success message of terminal, perform Routing Area Update to SGSN, and discharge the resource corresponding to switching terminal by MSC and SGSN notification source BSS.

Signaling message between usual above-mentioned terminal and target GANC transmits by the TCP signaling channel between terminal and GANC.

For better understanding the present embodiment method, provide below and adopt the one of the present embodiment method to realize signaling process, as shown in Figure 2, the terminal being in DTM state in GERAN carries out CS voice and PS data service just at the same time, and switching flow comprises:

A1, endpoint registration are to target GANC;

In register flow path, terminal can report its tenability switched GAN DTM in general access registration request (GA-RC Register Request) message, and GANC receives in (GA-RC Register Accept) message at the general access registration issued and indicates its tenability switched GAN DTM.When GANC and terminal all support that GAN DTM switches, the DTM just proceeding to GAN community switches;

A2, terminal send cell measurement reporting to source BSS, wherein comprise target GAN cell, and Jiang Gai GAN community be set to best cell;

A3, source BSS send the CS switching of carrying handover preparation request information respectively and require that (HandoverRequired) message and PS switch requirement (PS Handover Required) message to core net (CN:Core Network), require to switch;

For the purpose of simple, replace network element MSC, SGSN wherein and GGSN (GGSN:Gateway GPRS Supporting Node) etc. with CN in Fig. 2, draw the signaling transmission of access network equipment and MSC, SGSN no longer respectively; When the switching of PS territory needs SGSN-spanning to carry out, the message of forwarding can be forwarded to the SGSN at target GANC place through GGSN, or directly from source SGSN to target SGSN; Wherein SGSN comprises 2G SGSN and 3G SGSN;

A4, CN network element MSC, SGSN send CS handover request (Handover Request) message of carrying handover preparation request information respectively and PS handover request (PS Handover Request) message sets up transmission link to target GANC request;

A5, target GANC are that terminal sets up GA-RC DTM channel, and are established to the link of CS and PS of core net;

A6, target GANC send respectively to carry to switch and prepare CS Handover Request Acknowledge (the Handover Request Acknowledge) message of object information and to CN network element MSC, SGSN, PS Handover Request Acknowledge (PS HandoverRequest Acknowledge) message informs that switching prepares successfully; Can carry in Handover Request Acknowledge and switch reference value (Handover Reference), for identifying absolute radio frequency channel number (ARFCN:Absolute Radio Frequency Channel Number) and the base station identity code (BSIC:Base transceiver Station Identity Code) of GAN community;

A7, CN network element MSC, SGSN send respectively carry switch the CS preparing object information switch confirmation request (Handover Required Acknowledge) message and PS switch confirmation request (PS HandoverRequired Acknowledge) message to source BSS, notification source BSS in target GAN cell for terminal establishes transmission link;

A8, source BSS transmission includes the DTM switching command (DTM HandoverCommand) switching preparation object information, and message is to terminal, and command terminal is switched to target GAN cell; Terminal can by ARFCN and BSIC in switching command pair with ARFCN and BSIC of current registered GANC to comparing, if identical, illustrate and be switched to correct GAN community, proceed to switch; If different, then think and send handoff failure order to source BSS by handoff failure, allow source BSS cancel and switch;

A9, terminal performs the switching of target GANC, forward GAN mode of operation to, GA-CSR and GA-PSR and SAP thereof is used to carry out the transmitting-receiving of user data and signaling, namely terminal enters GA-RC DTM state, and send general access DTM and switched (GA-RC DTM Handover Complete) message to target GANC, (LA/RA Update) information is upgraded comprising location area/routing area, as: new Routing Area Identifier and Location Area Identification, and new packet TMSI (P-TMSI:PacketTemporary Mobile Subscriber Identity) and Temporary Mobile Subscriber Identity (TMSI:TemporaryMobile Subscriber Identity),

Terminal carries above-mentioned switching reference value in handoff completion message, and target GANC can differentiate whether be correct terminal access accordingly.GANC also can carry out similar judgement according to TMSI or P-TMSI of terminal or IMSI.

A10, target GANC send the CS comprising location area updating information respectively and have switched (HandoverComplete) message, and the PS comprising Routing Area Update information has switched (PS Handover Complete) message to CN network element MSC, SGSN; Simultaneously, the location area/routing area in handoff completion message is used to upgrade (LA/RA Update) information, perform the location area updating of MSC and the Routing Area Update flow process to SGSN respectively, or the location area/routing area performing associating upgrades (Combined RA/LA Updateprocedure); Handoff completion message can be used to carry out Route Area or location area updating;

A11, CN network element MSC, SGSN notification source BSS releasing resource, as in CS territory, MSC sends clear command (Clear Command) allows source BSS discharge CS resource, in PS territory, SGSN allows source BSS discharge PS resource by deleting PFC flow process (Delete PFC procedure); Terminate switching flow.

Embodiment two, a kind of DTM changing method being switched to GAN by other Access Networks, as shown in Figure 3, the present embodiment flow process is substantially identical with embodiment one, difference part is, in the present embodiment, target GANC can start the forwarding of business datum as early as possible after receiving handover preparation request information, and flow process comprises:

B1, terminal send and handover information to source BSS, and this information specifies the target GAN cell needing to be switched to;

B2, source BSS judge that the terminal initiating to switch is in DTM state, prepare to carry out DTM switching, and the CS handover preparation request information and PS handover preparation request information that switch mark with DTM are sent to target GANC by MSC, SGSN;

B3, target GANC, after receiving the handover preparation request information with DTM switching mark of MSC or SGSN transmission, are terminal and set up GA-RC DTM channel; Target GANC sends CS territory respectively switching after completing the foundation of GA-RC DTM channel prepares the switching preparation object information in object information and PS territory to MSC, the SGSN at BSS place, source; After terminal has set up GA-RC DTM channel, just can prepare to receive CS and PS data;

The switching that B4, MSC, SGSN are receiving CS, PS prepares after object information, can start to send descending CS, PS data of corresponding terminal to target GANC; And the switching of CS, PS is prepared object information and sends to source BSS;

Certainly, can adopt the mode copying forwarding, namely same downlink data also can be transmitted to source BSS;

B5, target GANC start, on the GA-RC DTM channel set up for terminal, to carry out the forwarding of corresponding downlink data to terminal;

GANC can carry out downlink data forwarding after setting up GA-RC DTM channel, can wait until that the switching in two territories prepares all to be successfully completed just to send business datum to terminal like this, reduce the possibility of loss of data in handoff procedure, ensure quality of service, improve Consumer's Experience.

B6, source BSS prepare object information according to the switching that MSC, SGSN return and send switching command to terminal;

The transmission of the enterprising row data of Traffic Channel of the switching command converting into target GANC that B7, terminal issue according to source BSS and reception; In fact now terminal data may be received on the GA-RCDTM channel of target GANC foundation.

The follow-up flow process of handover success, with embodiment one, repeats no more.

Embodiment three, a kind of DTM changing method being switched to GAN by other Access Networks, as shown in Figure 4, the present embodiment flow process is substantially identical with embodiment one, difference part is, in the present embodiment, terminal is except execution handoff procedure, also to handoff procedure whether time-out and monitoring the need of continuation execution, flow process comprises:

C1, terminal send and handover information to source BSS, and this message comprises the appointment to the target GAN cell that needs are switched to;

After C2, terminal trigger and switch, adopt first timer to carry out handoff procedure monitoring, step comprises:

C21, terminal start first timer;

In reality performs, the startup of first timer before or after handover information sends, also can be carried out simultaneously;

C22, in hand-off execution process after this, terminal according to first timer, whether monitor by time-out; If terminal does not receive the switching command of network side yet after first timer time-out, then think and perform step C23 by this handoff failure;

Terminal can be set to stop first timer after receiving switching command, if therefore first timer is overtime, illustrates that terminal does not receive the switching command of network side yet;

C23, terminal can switch or cancel switching by retry; If because the switching that current area Quality Down is initiated, also can attempt being switched to other GERAN communities;

C24, switch back and forth for the minizone of avoiding short trouble to cause is abnormal, whether terminal, at first timer run duration, can judge to cause the condition of handover trigger to exist, if do not exist, performs step C25;

As long as first timer is not overtime, whether terminal can judge causing the condition of switching to eliminate at any time, and, judge also to be not limited to only perform once, the front/rear execution of some step can be set in, also the cycle can fixed performs or is triggered by dependent event and performs, as message arrival, network settings condition meet; Terminal can carry out record when switching and starting to handover triggering condition, in follow-up judgement, only needs to judge whether this condition still meets;

C25, terminal are cancelled and being switched;

Terminal can send handover cancelling message to source BSS, is performed the cancellation flow process switched by source BSS, and such as notification target GANC discharges established link etc.;

C3, source BSS judge that the terminal initiating to switch is in DTM state, and transmission CS handover preparation request information and PS handover preparation request information, to CN, are carried out switching and prepared;

C4, target GANC, after the handover preparation request information receiving CS and the PS territory that CN sends, for terminal sets up GA-RC DTM channel, and return switching preparation object information to CN;

C5, source BSS prepare object information according to the switching that CN sends and send switching command to terminal;

C6, terminal are switched to the GA-RC DTM channel of target GANC according to the switching command that source BSS issues.

The follow-up flow process of handover success, with embodiment one, repeats no more.

Embodiment four, a kind of DTM changing method being switched to GAN by other Access Networks, as shown in Figure 5, the present embodiment flow process is substantially identical with embodiment one, difference part is, in the present embodiment, target GANC is except execution handoff procedure, and also to handoff procedure, whether time-out is monitored, and flow process comprises:

D1, terminal send and handover information to source BSS, and this packets of information is containing the appointment of the target GAN cell be switched to needs;

D2, source BSS judge that the terminal initiating to switch is in DTM state, and transmission CS handover preparation request information and PS handover preparation request information are to CN simultaneously;

D3, target GANC are after the handover preparation request information receiving CS and PS that CN sends, and adopt second timer to carry out handoff procedure monitoring, step comprises:

D31, target GANC are that this time switches startup second timer;

Corresponding to the strategy on opportunity that the multiple GA-RC DTM channel provided in embodiment one is set up, target GANC can control the startup opportunity of second timer flexibly, target GANC can receive one of handover preparation request information or start second timer after all receiving, and also can start second timer before or after set up GA-RC DTM channel for terminal; If target GANC at the handoff procedure performing multiple terminal, can start multiple timer accordingly simultaneously;

D32, in hand-off execution process after this, target GANC according to second timer, whether monitor by time-out; If terminal accesses not yet after second timer time-out, then think and perform step D33 by this handoff failure;

According to the message receiving terminal transmission, usual GANC can judge that terminal accesses, such as, receive handoff completion message or the user data package of first CS or PS of terminal transmission.GANC can be set to stop second timer after receiving handoff completion message, if therefore second timer time-out, terminal still unsuccessful access is described;

D33, target GANC stop performing handoff procedure, and release has been the link of terminal foundation, and can this handoff failure of notification source BSS and reason;

D34, with embodiment three in similar, the minizone that causes for avoiding short trouble is abnormal to be switched back and forth, and whether GANC, at second timer run duration, can judge to cause the condition of handover trigger to exist, if do not exist, can cancel switching, performs step D33;

D4, target GANC are that terminal sets up GA-RC DTM channel, and return CS and PS switching preparation object information to CN;

D5, source BSS prepare object information according to the switching that CN returns and send switching command to terminal;

D6, terminal are switched to the GA-RC DTM channel of target GANC according to the switching command that source BSS issues.

The follow-up flow process of handover success, with embodiment one, repeats no more.

For clarity sake, above-described embodiment two, three and four is described some preference policy in the handoff procedure from GERAN to GAN and controlling mechanism respectively, and in actual applications, these preferred versions also can integrate, use of arranging in pairs or groups flexibly.Such as, the monitoring mechanism etc. of terminal and target GANC can be adopted simultaneously.

Above the method for incision GAN is described in detail, has provided the example cut out from GAN below.

Embodiment five, a kind of DTM changing method being switched to other Access Networks by GAN, suppose in the present embodiment that other Access Networks are GERAN, method flow as shown in Figure 6, comprising:

E1, when handover triggering condition meets, source GANC judges that itself and terminal room exist GA-RC DTM channel, and when GANC and MS supports that GAN DTM switches, CS handover preparation request information and PS handover preparation request information are sent to the BSS of selected target radio access network community by source GANC;

In GAN, the triggering of switching can be performed by GANC or terminal, provides following three kinds of concrete triggering modes in the present embodiment:

One, GANC measures the channel conditions of CS and PS of designated terminal, comprises the error rate, delay, and system loading etc.GANC, according to the measurement result of self and system configuration, comprises GERAN or UTRAN Lin Qu and configures, and initiate to switch, and directly selected target GERAN community switches when the quality of terminal GA-RC DTM channel is reduced to a certain degree.After switching is initiated, GANC can notify also can not notification terminal, if select not notification terminal, then terminal only can switch be ready to complete after receive the switching command of GANC, directly perform and switch.

Two, switching also can be triggered by terminal, the GA-RC DTM channel quality that terminal is found to GANC by local measurement declines, thus send and switch Reference News to GANC as handover information, GANC performs accordingly and sends CS/PS handover preparation request information to core-network side; Terminal can switch in Reference News the GERAN cell information that comprise and obtain in GERAN network recently, selects best community as the wireless access network community switching target by GANC, as according to cell quality or system configuration principle.

The moving range of terminal in GAN network may be very large, such as cross and be redirected, therefore the last GERAN/URAN network obtained situation may and be not suitable with current switching needs, in order to improve switching efficiency, cell information can not comprised in switching Reference News, or provide an instruction to GANC, select suitable Target cell to switch by GANC.In this case, the system configuration to other RAT communities of periphery that GANC can be preset according to it, carries out the selection of Target cell.Such as: the corresponding relation of the configurable WLAN (wireless local area network) that it controls of GANC (WLAN:Wireless Local Area Network) all access points (AP:Access Point) and other RAT communities, each AP may corresponding other RAT communities one or more.GANC can use Access Point Identifier (AP-ID:AP Identifier) to identify each AP, AP-ID is the physical label of terminal attachment point, as MAC (Medium Access Control) address, terminal is connected to generic IP network by this attachment point.After GANC establishes the corresponding relation of AP-ID and other RAT communities, when a Target cell selected by needs for certain terminal, Access Point Identifier (AP-ID:AP Identifier) associated by present terminal, according to the AP of above-mentioned foundation and the relation of other RAT communities, select a suitable community as Target cell.

Terminal, when GAN community, also periodically can use and support that the wireless environment of receiver to other Access Networks of surrounding of other RAT is measured, find its wireless area that can support around and store; These up-to-date wireless areas detected can be comprised in switching Reference News.

Three, switch and can also be triggered by GANC, then judged by terminal.GANC when finding that PS and/or CS link-quality drops to a certain degree, can send link-quality indication information to terminal, and instruction needs switch, and sends switching Reference News again to GANC by terminal according to the link-quality indication information received.

Owing to relating to the switching carried out in PS territory and CS territory simultaneously, therefore in mode two, three, the terminal and the GANC that trigger switching can in the handover informations sent and link-quality Indication message, instruction is that the transmission link in which territory goes wrong, and recipient can judge whether to ignore this message, do not switch.

Also the switch triggering method in existing system in CS and PS territory can be used, in mode two, three, initiated to switch by GA-CSR or the GA-PSR layer in terminal or GANC, switch instruction with DTM in the link-quality indication information of CS or PS that the switching Reference News of CS or PS that terminal sends and GANC send, indicate and need to carry out DTM switching; When GANC receives any switching laws Reference News switching instruction with DTM, trigger and carry out DTM switching.

With similar in embodiment one, the CS/PS handover preparation request information that source GANC sends can be transmitted to target BS S by CN, allows target BS S reserve resource.Can carry DTM in CS/PS handover preparation request information and switch mark, switching to indicate this is that DTM switches.

Carry out in process in switching, namely after handover trigger, switched before or cancel before, terminal and GANC do not discharge the link of CS or PS.Such as, do not trigger and perform release flow process, releasing request message do not responded or refusal etc.

After E2, target BS S receive the handover preparation request information of CN transmission, carry out DTM channel resource for terminal and reserve, and return CS/PS switching preparation object information to source GANC; CS and PS switches the mark preparing to include DTM switching in object information;

Same CS/PS switches preparation object information can be transmitted to GANC by CN; This step, BSS can perform according to the existing DTM switching flow carried out in GERAN;

In addition, with similar in embodiment two, after target BS S distributes radio channel resource, namely CS and PS business datum or signaling can be issued on these channels; CS and the PS business datum or signaling that are sent to terminal by source GANC, after receiving CS/PS switching preparation object information, can be copied portion simultaneously, use the channel distributing to this terminal to send by target BS S by CN;

E3, source GANC prepare object information according to the switching received and send switching command to terminal;

This switching prepares terminal switch that object information forwards with CN to the access information needed for target BS S, comprises Radio Resource description, system message 6, power control parameters, carrier frequency identify, the information etc. such as switching reference value.

CS business and PS business are switched to according to the switching command of GANC the DTM channel that target BS S set up by E4, terminal simultaneously, carry out the transmission of business and signaling;

If terminal switch, to the community of a known time lead (TA:Timing Advance), can not perform access process, the Radio Resource distributed for it is directly used to carry out CS and PS business; Now, terminal directly can carry out the reception of business datum in the Traffic Channel of distributing.

This step can refer to the terminal access process that in GERAN, DTM switches and performs.

In addition, with reference to existing switching flow, after terminal successfully accesses, also can perform the subsequent operation of handover success, comprise:

E5, when target BS S receive travelling carriage location area/routing area updating message or correctly receive travelling carriage send voice/data, think that switching completes, upgrade to MSC executing location district, perform Routing Area Update to SGSN, or perform joint route area/location more new technological process;

E6, MSC and SGSN notification source GANC discharges corresponding resource, terminates switching flow.

After terminal successful switch to target BS S or simultaneously, or after the link release between terminal and GANC or simultaneously, terminal forwards GERAN/UTRAN mode of operation to: in CS territory, the service radio resource layer (Serving RR) providing Radio Resource to serve is transformed into GSM RR layer, do not re-use Service Access Point between MM layer and GA-CSR, and it is invalid that GA-CSR state becomes; In PS territory, Serving RR becomes GSM RR layer, and GA-PSR is separated with all GPRS SAP.Terminal can be selected to cancel the registration at this GANC.If cancel register, the state of terminal transfers common radio resource unregistered (GA-RC De-Registered) state to, and terminal can not perform the direct transition status of cancel register flow path; If not cancel register, the state of terminal transfers common radio resource registered (GA-RC Registered) state to, keeps the signaling link with GANC.

Signaling message between usual above-mentioned terminal and source GANC transmits by the TCP signaling channel between terminal and GANC.

For better understanding the present embodiment method, provide below and adopt the one of the present embodiment method to realize signaling process, as shown in Figure 7, the terminal being in GA-RC DTM state in GAN carries out CS voice and PS data service just at the same time, and switching flow comprises:

E1, source GANC send general access DTM uplink quality instruction (GA-RC DTMUplink Quality Indic ation) message to terminal, CS and/or the PS uplink quality fault of indicating terminal current GA-RC DTM channel, triggers and switches;

Source GANC also can send general access CS uplink quality instruction (GA-CSRUplink Quality Indication) message to terminal, a PS designator (PS Indication) is carried in message, or general access PS uplink quality instruction (GA-PSR Uplink Quality Indication) message, carry a CS designator (CS Indication) in message, being indicated by the designator in message needs to carry out DTM switching;

E2, terminal send general access DTM and switch with reference to (GA-RC DTM Handover Information) message to source GANC; Carry GERAN/UTRAN cell list in this message as handover information, and the channel quality of each community describes, GANC can select the best community of channel quality as Target cell according to the receiving level strength of each GERAN community in report;

Correspondingly, terminal also can send general access CS to GANC and switch with reference to (GA-CSRHandover Information) message, a PS designator (PS Indication) is carried in message, or general access PS switches with reference to (GA-PSR Handover Information) message, carry a CS designator (CS Indication) in message, being indicated by the designator in message needs to carry out DTM switching; If do not carry designator, or designator instruction does not need to carry out DTM switching, and GANC only initiates the switching flow of corresponding field.

GAN community, source normally can not be got back to after avoiding terminal switch failure, terminal is after the above-mentioned switching Reference News of transmission in a period of time, do not discharge the link of CS or PS, namely do not trigger or perform general access CS and link release flow process or general access packet transmission channel deexcitation flow process; For general access packet transmission channel, can be realized by the general access grouped channels timer (GA-PSR ChannelTimer) of stopping corresponding to this channel or the method for restarting after this timer expiry; For the release flow process that GANC triggers, can not respond or refuse.

E3, source GANC send the CS switching of carrying handover preparation request information respectively and require that (HandoverRequired) message and PS switch requirement (PS Handover Required) message to core net CN, request switching; It is that DTM switches that CS switching require message and PS to switch to require to indicate this to switch in message, namely carries out CS and PS simultaneously and switches;

With similar in Fig. 2, replace MSC and SGSN or GGSN with CN equally in Fig. 7, draw the signaling transmission of access network equipment and CN network element no longer respectively; GANC directly can access GGSN, makes transmitted in packets efficiency higher;

E4, CN send and carry CS handover request (Handover Request) message of handover preparation request information and PS handover request (PS Handover Request) message reserves DTM resource to target BS S request;

When GANC directly accesses GGSN, now GANC can pass through standard interface, as gn interface, the packet data protocol activated (PDP:Packet Data Protocol) context list is sent to the connected SGSN of target BS S, may without packet flow context (PFC:Packet Flow Context) list in PS handover request message, therefore after the SGSN of goal systems receives the PDP Context list that source GANC sends, can trigger before or after transmission PS handover request message to target BS S and set up PFC flow process (Create PFC procedure), carry out the negotiation of QoS,

E5, target BS S are that travelling carriage carries out DTM resource reservation, and organize CS/PS to switch preparation object information;

E6, target BS S send respectively to carry to switch and prepare CS Handover Request Acknowledge (the Handover Request Acknowledge) message of object information and PS Handover Request Acknowledge (PS HandoverRequest Acknowledge) message is reserved successfully to CN announcing resource;

E7, CN send to carry and switch the CS preparing object information and switch confirmation request (Handover RequiredAcknowledge) message and PS to switch confirmation request (PS Handover Required Acknowledge) message to source GANC, notification source GANC be the good DTM resource of terminal distribution in target GERAN Cell;

E8, source GANC send general access DTM switching command (GA-RC DTM HandoverCommand) message to terminal, existing DTM switching command (DTMHandover Command) can be encapsulated in this message, the switching comprising target BS S prepares object information, and command terminal is switched to target GERAN Cell;

If terminal does not know the TA value of Target cell, need to perform e9, e10; Otherwise, can not perform;

E9, terminal send switching access (Handover Access) message of CS to target BS S;

E10, target BS S send the physical message (Physical Information) of CS to terminal, carry the TA value of Target cell;

E11, terminal use Target cell to be the Radio Resource that it distributes, and transmission location area updating (LocatingArea Update Request) message and Routing Area Update (Routing Area Update Request) message are to target BS S;

E12, target BS S send the CS comprising location area updating information respectively and have switched (HandoverComplete) message, switch (PS Handover Complete) message with the PS comprising Routing Area Update information and, to CN, carry out location area/routing area renewal;

E13, CN notification source GANC releasing resource, terminates switching flow.

During concrete execution, GANC can discharge CS and PS territory respectively:

In CS territory, MSC sends clear command (Clear Command) allows source GANC discharge CS resource, and after receiving this message, GANC triggers general access CS and links release flow process (GA-CSR ConnectionRelease procedure);

In PS territory, SGSN allows source GANC discharge PS resource by deleting PFC flow process (Delete PFC procedure), after completing PFC deletion, GANC triggers general access packet transmission channel deexcitation flow process (GA-PSR Transport Channel Deactivation procedure).

After GANC also can delete at the PFC receiving the clear command of CS and PS, use general access double-transmission mode channel to discharge flow process (GA-RC DTM Channel Release procedure) and together discharge CS and PS territory resource:

1, GANC sends general access double-transmission mode channel release request (GA-RC DTM ChannelRelease Request) message to terminal, notifies the link of its release CS and PS;

2, terminal discharges all channels, then sends the release of general access double-transmission mode channel and confirms that (GA-RC DTM Channel Release Acknowledge) message is to GANC, confirms release.

Certainly, also can pass through the instruction of carrying the release of DTM channel in the message in general access CS link release flow process or general access packet transmission channel deexcitation flow process, discharge DTM channel by a flow process.

By said process, all channels between terminal and GANC are released, and terminal gets back to GAN idle condition, are in GERAN/UTRAN operator scheme, and GA-CSR is separated with GA-PSR and GSM RR, do not re-use corresponding SAP.

Embodiment six, a kind of DTM changing method being switched to other Access Networks by GAN, as shown in Figure 8, the present embodiment flow process is substantially identical with embodiment five, handover trigger adopts the mode two or three in embodiment five, difference part is, in the present embodiment, terminal is except execution handoff procedure, and also to handoff procedure whether time-out and monitoring the need of continuation execution, flow process comprises:

F1, terminal send and handover information to source GANC, report GERAN cell information;

After F2, terminal determine to initiate switching, adopt the 3rd timer to carry out handoff procedure monitoring, concrete monitor procedure can refer to embodiment three execution, comprising:

F21, terminal start the 3rd timer;

F22, terminal are set to stop the 3rd timer after receiving switching command, and in hand-off execution process after this, if the 3rd timer expiry, then terminal thinks this handoff failure, performs step F 23;

F23, terminal retry switch or cancel and switch;

F24, switch back and forth for the minizone of avoiding short trouble to cause is abnormal, whether terminal, at the 3rd timer run duration, can judge to cause the condition of handover trigger to exist, if do not exist, performs step F 25;

After handoff failure, terminal can not get back to GAN community, source, at the 3rd timer run duration: if receive general access CS to link release (GA-CSR Release) or general access packet transmission channel deexcitation request message (GA-PSR-DEACTIVATE-UTC-REQ), do not respond or refuse; If general access grouped channels timer expiry, then restart this timer; Also not sending general access CS link removing asks (GA-CSR CLEAR REQUEST) or general access packet transmission channel to go to discharge Traffic Channel;

F25, terminal are cancelled and being switched, and state does not change, and continues to stay GAN community;

Terminal can send handover cancelling message to source GANC, is performed the cancellation flow process switched by source GANC, and such as notification target BSS discharges Resources allocation etc.;

F3, source GANC judge that the terminal initiating to switch is in DTM state and (namely there is the two transmission channel of general access, GA-RC DTM Channel), select target GERAN community from the GERAN cell information of terminal to report, transmission CS handover preparation request information and PS handover preparation request information, to core net, prepare to carry out DTM and are switched to target BS S;

F4, target BS S, after the handover preparation request information receiving core net forwarding, are terminal distribution DTM channel, and return switching preparation object information to source GANC by core net;

F5, source GANC prepare object information according to the switching that core net returns and send switching command to terminal;

F6, terminal proceed to the switching of target BS S according to the switching command that source GANC issues.

The follow-up flow process of handover success, with embodiment five, repeats no more.In the 3rd timer that in the present embodiment, terminal uses and embodiment three, the first timer that uses of terminal can be same.

Embodiment seven, a kind of DTM changing method being switched to other Access Networks by GAN, as shown in Figure 9, the present embodiment flow process is substantially identical with embodiment five, difference part is, in the present embodiment, target GANC is except execution handoff procedure, and also to handoff procedure, whether time-out is monitored, and flow process comprises:

After G1, DTM handover trigger, source GANC transmission CS handover preparation request information and PS handover preparation request information are to core net; Handover trigger can one of three kinds of modes in optional embodiment five;

After G2, source GANC determine to initiate switching, adopt the 4th timer to carry out handoff procedure monitoring, step comprises:

G21, source GANC are that this time switches startup the 4th timer;

After handoff failure, terminal can not get back to GAN community, source, release Traffic Channel is not triggered at the 4th timer run duration: GANC, or do not respond or refuse the releasing request of Traffic Channel, link release (GA-CSR Release) or general access packet transmission channel deexcitation request message (GA-PSR-DEACTIVATE-UTC-REQ) as GANC does not send general access CS; If GANC receives general access CS link removing request (GA-CSR CLEAR REQUEST) or general access packet transmission channel goes to discharge Traffic Channel, do not respond or refuse;

G22, source GANC are set to prepare object information in the switching receiving CN or stop the 4th timer after receiving handover cancelling, in hand-off execution process after this, if the 4th timer expiry, then perform step G24;

As long as G23 the 4th timer is not overtime, whether GANC can judge causing the condition of switching to eliminate at any time, and, judge also to be not limited to only perform once, the front/rear execution of some step can be set in, also the cycle can fixed performs or is triggered by dependent event and performs, as message arrival, network settings condition meet; GANC can carry out record when switching and starting to handover triggering condition, in follow-up judgement, only needs to judge whether this condition still meets; If judge to find to cause the condition of switching to eliminate, then perform step G24 and cancel switching;

G24, source GANC cancel switching;

G3, target BS S, after the handover preparation request information receiving core net forwarding, are terminal distribution DTM channel, and return switching preparation object information to source GANC by core net;

G4, source GANC prepare object information according to the switching that core net returns and send switching command to terminal;

G5, terminal proceed to the switching of target BS S according to the switching command that source GANC issues.

The follow-up flow process of handover success, with embodiment five, repeats no more.

For clarity sake, above-described embodiment six and seven is described the preferred controlling mechanism of some in the handoff procedure from GAN to GERAN respectively, and in actual applications, these preferred versions also can integrate, use of arranging in pairs or groups flexibly.Such as, the monitoring mechanism etc. of terminal and source GANC can be adopted simultaneously.

Below the general access network controller being applicable to above-described embodiment method is described in detail.

Embodiment eight, a kind of general access network controller 10, as shown in Figure 10, comprise transmission unit 11, bi-mode control unit 12 and switch control unit 13;

Transmission unit 11, for being provided for the user data link of circuit domain and packet domain for terminal, such as Generic Access Circuit link and general access packet transmission channel, carry out the transmitting-receiving of CS and PS user data;

Bi-mode control unit 12, for according to the instruction controls transfer unit 11 of switch control unit 13 being the user data link that the foundation of same terminal or release are used for circuit domain and packet domain;

Switch control unit 13 comprises incision control unit 131 and cuts out control unit 132;

Incision control unit 131, the circuit domain handover preparation request information to same terminal sent for the treatment of core-network side and packet domain handover preparation request information, instruction bi-mode control unit 12 is that described terminal sets up the user data link being used for circuit domain and packet domain, and returns switching preparation object information to core-network side;

If carry the mark that terminal is in two transmission state in the circuit domain handover preparation request information that incision control unit 131 receives and packet domain handover preparation request information; Then cut control unit 131 and can adopt such control strategy, namely, after receiving one of circuit domain and packet domain handover preparation request information or all handover preparation request information, bi-mode control unit 12 is namely indicated to set up the user data link for circuit domain and packet domain for terminal;

Cut out control unit 132, for judging that terminal exists the user data link for circuit domain and packet domain simultaneously, send carry double-transmission mode switch mark circuit domain handover preparation request information and packet domain handover preparation request information to core-network side; Receive the switching that returns of core-network side and prepare object information, send switching command to terminal, instruction bi-mode control unit 12 is released to the user data link for circuit domain and packet domain of described terminal foundation.

By the general access network controller that the embodiment of the present invention eight provides, make the mobile terminal simultaneously carrying out circuit domain and packet switch domain service, by different access technologies, at the online free-roaming of wireless core, user mobility and business impression can be improve.

Embodiment nine, a kind of general access network controller 20, as shown in figure 11, the present embodiment general access network controller, when the DTM proceeding to other Access Networks switches, is applicable to adopting the first triggering mode provided in embodiment five;

General access network controller 20 comprises transmission unit 21, bi-mode control unit 22 and switch control unit 23; Switch control unit 23 comprises incision control unit 231, cuts out control unit 232 and quality measurement unit 233;

Wherein transmission unit 21, bi-mode control unit 22 and incision control unit 231 and transmission unit 11, bi-mode control unit 12 in embodiment eight and the similar cutting control unit 131, repeat no more;

Quality measurement unit 233, for being used for the quality of the user data link of circuit domain and packet domain to this locality, judge to initiate to switch according to measurement result, and according to the preset configuration to other wireless access network communities, select the wireless access network community as switching target;

Cut out control unit 232, for the selection according to quality measurement unit 233, and judge that terminal exists the user data link for circuit domain and packet domain simultaneously, send carry double-transmission mode switch mark circuit domain handover preparation request information and packet domain handover preparation request information to core-network side; Receive the switching preparation object information that core-network side returns, send switching command to terminal; When needs releasing resource, the user data link for circuit domain and packet domain that instruction bi-mode control unit 22 is released to that described terminal sets up.

Embodiment ten, a kind of general access network controller 30, as shown in figure 12, the present embodiment general access network controller, when the DTM proceeding to other Access Networks switches, is applicable to adopting second and third kind of triggering mode provided in embodiment five;

General access network controller 30 comprises transmission unit 31, bi-mode control unit 32 and switch control unit 33; Switch control unit 33 comprises incision control unit 331, cuts out control unit 332, quality indicating member 333 and request reception unit 334;

Wherein transmission unit 31, bi-mode control unit 32 and incision control unit 331 and transmission unit 11, bi-mode control unit 12 in embodiment eight and the similar cutting control unit 131, repeat no more;

Quality indicating member 333, switches to terminal instruction needs for sending link-quality indication information;

Request reception unit 334, for the switching Reference News that receiving terminal sends; This switching Reference News can be that terminal initiatively sends, and also can be that the link-quality indication information of terminal feedback quality indicating member 333 sends;

Cut out control unit 332, for the switching Reference News received according to request reception unit 334, and judge that terminal exists the user data link for circuit domain and packet domain simultaneously, send carry double-transmission mode switch mark circuit domain handover preparation request information and packet domain handover preparation request information to core-network side; Receive the switching preparation object information that core-network side returns, send switching command to terminal; When needs releasing resource, the user data link for circuit domain and packet domain that instruction bi-mode control unit 32 is released to that described terminal sets up.

Embodiment 11, a kind of general access network controller 40, as shown in figure 13, the present embodiment general access network controller, when carrying out DTM and switching, can be monitored the switching flow of this community of incision or the switching flow cutting out this community, certainly, the monitoring capacity of two kinds of flow processs can be arranged respectively;

General access network controller 40 comprises transmission unit 41, bi-mode control unit 42 and switch control unit 43; Switch control unit 43 comprises incision control unit 431, cuts out control unit 432, timer 1 and timer 2 434;

Wherein the similar of transmission unit 41 and bi-mode control unit 42 and transmission unit 11 in embodiment eight and bi-mode control unit 12, repeats no more;

Incision control unit 431, the circuit domain handover preparation request information to same terminal sent for the treatment of core-network side and packet domain handover preparation request information, timer 1 is started after receiving described handover preparation request information, instruction bi-mode control unit 12 is that described terminal sets up the user data link being used for circuit domain and packet domain, and returns switching preparation object information to core-network side; At timer 1 run duration, detect and cause the reason of switching whether also to exist, if not, then cancel switching; When receiving the access information of terminal, then stop timer 1; If the overtime described terminal of timer 1 accesses not yet, it is the link that described terminal is set up that instruction bi-mode control unit 12 discharges, and notifies by core net the source wireless access network that initiation switches;

Cut out control unit 432, for judging that terminal exists the user data link for circuit domain and packet domain simultaneously, transtation mission circuit territory handover preparation request information and packet domain handover preparation request information to core-network side, and start timer 2 434; Receive the switching preparation object information that core-network side returns, send switching command to terminal; When needs releasing resource, the user data link for circuit domain and packet domain that instruction bi-mode control unit 42 is released to that described terminal sets up; At timer 2 434 run duration, detect and cause the reason of switching whether also to exist, if not, then cancel switching; Receive after switching preparation object information, or after sending switching command, stop timer 2 434; If timer 2 434 is overtime, cancels and switch or select to be switched to other RAT communities.

Can be found out by above-described embodiment, the application of the embodiment of the present invention makes the mobile terminal simultaneously carrying out circuit domain and packet switch domain service, by different access technologies, at the online free-roaming of wireless core, can improve user mobility and business impression; In addition, adopt the various preferred version provided in above-described embodiment and control strategy further, make the changing method provided have stronger reliability and more excellent effect.

Above dual-transmission mode switching method provided by the present invention and general access network controller are described in detail, apply specific case herein to set forth principle of the present invention and execution mode, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.

Claims (4)

1. a device for wireless access network, is characterized in that, comprising: described wireless access network is source wireless access network, and described device comprises:

For the module of the handover information that receiving terminal sends, described handover information comprises the appointment to the target universal access network GAN community that needs are switched to;

For judging that described terminal is in double-transmission mode DTM state, circuit domain handover preparation request information and packet domain handover preparation request information are sent to the module of the general access network controller GANC of described target GAN cell, it is the user data link that described terminal sets up for circuit domain and packet domain that described circuit domain handover preparation request information and packet domain handover preparation request information are used for described target GANC according to described circuit domain handover preparation request information and packet domain handover preparation request information, and returns switching preparation object information to described source wireless access network;

Send switching command to the module of described terminal for preparing object information according to described switching, described switching command is used for described terminal and respectively circuit domain business and packet switch domain service is switched to the user data link being used for circuit domain and packet domain set up according to described switching command.

2. a general access network controller GANC, is characterized in that, comprising: described GANC is source GANC, and described source GANC comprises:

For judging that terminal exists the user data link for circuit domain and packet domain simultaneously, circuit domain handover preparation request information and packet domain handover preparation request information are sent to the module of the wireless access network of selected Target cell, it is that described terminal is carried out two transmission channel resources and reserved that described circuit domain handover preparation request information and packet domain handover preparation request information are used for described target radio access network according to described circuit domain handover preparation request information and packet domain handover preparation request information, and returns to switch and prepare object information to described source GANC;

Send switching command to the module of described terminal for preparing object information according to described switching, described switching command is used for described terminal and respectively circuit domain business and packet switch domain service is switched to the two transmission channels distributed according to described switching command.

3. general access network controller GANC according to claim 2, is characterized in that, also comprise:

For sending the module that link-quality indication information needs to described terminal instruction to carry out switching, according to described link-quality indication information transmission, handover information to described source GANC to make described terminal.

4. a general access network controller GANC, is characterized in that, comprising:

For receiving the module of circuit domain handover preparation request information that source wireless access network sends and packet domain handover preparation request information, when the handover information that source wireless access network receiving terminal sends, described handover information comprises the appointment to the target universal access network GAN community that needs are switched to, and when described source wireless access network judges that described terminal is in double-transmission mode DTM state;

For according to described circuit domain handover preparation request information and packet domain handover preparation request information being the user data link that described terminal sets up for circuit domain and packet domain, and return switching preparation object information to the module of described source wireless access network, described switching prepares object information and is used for described source wireless access network according to described switching preparation object information transmission switching command to described terminal, described switching command is used for described terminal and respectively circuit domain business and packet switch domain service is switched to the user data link being used for circuit domain and packet domain set up according to described switching command.