CN103906159B

CN103906159B - Different systems network reselection method, multimode terminal and system

Info

Publication number: CN103906159B
Application number: CN201210590760.3A
Authority: CN
Inventors: 王清; 卞国东; 李飞; 杜长浩; 乔勇; 戴宸光
Original assignee: China Mobile Group Jiangsu Co Ltd
Current assignee: China Mobile Group Jiangsu Co Ltd
Priority date: 2012-12-31
Filing date: 2012-12-31
Publication date: 2017-11-21
Anticipated expiration: 2032-12-31
Also published as: CN103906159A

Abstract

The invention discloses a kind of different systems network reselection method, multimode terminal and system, wherein, this method includes：Terminate 2G speech businesses or reside in 2G networks multimode terminal intend to 3G network carry out gravity treatment when, multimode terminal initiates the request of ps domain session service；For multimode terminal after 2G networks establish connection, the system information that the BSC by reading 2G networks is issued obtains adjacent 3G network information；After the BSC of 2G networks receives the 3G network measurement report that multimode terminal reports, the direct handoff procedures of PS of 2G networks to 3G network are initiated；Multimode terminal, by 2G network switchings to 3G network, carries out position area and Routing Area Update, and discharge ps domain session service according to adjacent 3G network information.The present invention reduces off-grid time of multimode terminal when to TD network reselections, further ensure multimode terminal and be normally carried out from calling of the 2G networks into TD network switching formula reuse adoption process and data service.

Description

Different systems network reselection method, multimode terminal and system

Technical field

The present invention relates to core network technology field in the communications field, in particular it relates to different systems network reselection method, more Mould terminal and system.

Background technology

At present, multimode terminal（Present invention generally refer to support GSM and TD-SCDMA dual-mode terminals）In GSM and TD-SCDMA nets The technical scheme of interoperability under network has：

1st, GSM network and TD-SCDMA in existing network（Below can abbreviation TD）The interoperability scheme of network includes：

（1）In Idle state, multimode terminal realizes the conversion between GSM network and TD-SCDMA network by way of gravity treatment, Off-grid occurs in multimode terminal in the transfer process of different system, and can not realize calling and called；

（2）In speech business, multimode terminal is allowed in CS domains（Circuit Switched Domain, circuit switching Domain）It is directly switch into GSM network from TD-SCDMA network, is directly switch to TD- from GSM network system without being allowed in CS domains The mode of SCDMA networks；

（3）In data service, multimode terminal supports the two-way gravity treatment between GSM network and TD-SCDMA network, in gravity treatment During, interruption occurs in data service；

（4）Voice and packet data concurrent service（Data service and speech business are initiated simultaneously）, speech business can cut from TD-SCDMA network GSM network is changed to, data service is suspended.

Problems with can be inevitably run into the interoperability scheme of the above-mentioned GSM network of application and TD-SCDMA network：

（1）Multimode terminal is initiated to call or is called in TD-SCDMA network, in voice call process, due to TD- SCDMA network coverage deficiencies cause multimode terminal to be directly switch into GSM network system from TD-SCDMA network system in CS domains, lead to It is unaffected during words.But after multimode terminal voice call terminates simultaneously on-hook, multimode terminal will be initiated from GSM network Gravity treatment to TD-SCDMA network intersystem reselection process, until reside in again in TD-SCDMA network.Between this system It in reuse adoption process, off-grid, multimode terminal can will be unable to normally be called for some time, can not also be used as called.

Again the flow that TD-SCDMA cells are resident after speech business terminates under GSM network is as follows：

Step 1, multimode terminal is in communication process, if TD signals are weak, GSM signals are stronger, and terminal will be cut from TD networks GSM network is changed to, voice terminates on-hook；

Step 2, multimode terminal reads GSM network system message, then initiates GSM network location area updating, multimode terminal In this step, calling and called can not be done, the multimode terminal unreachable time is the 4-5 seconds；

Step 3, multimode terminal starts to measure TD-SCDMA signals, is judged according to GSM to TD network reselection algorithms, to TD-SCDMA network initiates reuse adoption process；

Step 4, after multimode terminal foundation synchronous with the completion of TD cells, TD cell system informations are read, TD terminals are unreachable The time delay 2-3 seconds, now multimode terminal can not do calling and called；

Step 5, multimode terminal initiates TD-SCDMA network location area updating, unreachable time delay 2-3 seconds, now multimode terminal Calling and called can not be done.

Step 6, for multimode terminal after the success of TD-SCDMA network location area updating, multimode terminal resides in TD- again On SCDMA networks.

Similarly, during multimode terminal is from TD network reselection to GSM network, off-grid and time delay for some time are understood. In reuse adoption process, multimode terminal will be unable to normally be called, and can not also be used as and be called, directly affects user and use multimode The customer perception of terminal.

2nd, handoff procedure of the multimode terminal between data service when carry out system

Packet traffic requests are initiated and after being successfully accessed by TD-SCDMA network, RNC（Radio Network Controller, radio network controller）Meeting initiates corresponding measurement control according to the situation of neighbor cell, when in satisfaction measurement Multimode terminal will be to RNC report measurement results during tape part.RRM in RNC（Radio Resource Management, wirelessly Resource management）Measurement result is carried out handling judgement and determines the Target cell of switching, the Target cell if necessary to switching is GSM/GPRS（That is 2G, similarly hereinafter）Cell, then the TD-SCDMA of network-side triggering is performed to GSM/GPRS cell reselection process.

Cell reselection process from TD-SCDMA to GSM/GPRS, as network-side triggering, ps domain（Packet SwitchedDomain, packet-switched domain）Business, Inter-SGSN, including：

CELL CHANGE ORDER FROM UTRAN message is sent from RNC to multimode terminal first, multimode terminal receives The cell reselection process to GSM/GPRS is performed after to the message, the process multimode terminal reads Target cell from TD network sides and is GSM/GPRS cells, initiate in GSM/GPRS network insertion flows：

（1）Multimode terminal sends CHANNEL on GSM/GPRS network system RACH channels by predetermined time and number REQUEST message, then, multimode terminal leave TD-SCDMA network, and multimode terminal will monitor BCCH and its corresponding CCCH All descending CCCH time slots of paging group.Wherein, CHANNEL REQUEST message packages contain random access information, establish reason（Bag Include stage packet access request, PDCH resource requirements etc.）.

（2）When BSS network sides receive the CHANNEL REQUEST message for the instruction packet access for carrying out self terminal transmission, Network side is that the multimode terminal distributes a Temporary Block Flow mark（TFI）And the resource for including a PDCH is assigned, send simultaneously The IMMEDIATE ASSIGNMENT message of downlink packet assignment.

（3）Multimode terminal is when receiving the IMMEDIATE ASSIGNMENT message of downlink packet assignment, multimode terminal Stop monitoring descending CCCH, be transformed into the PDCH of BSS assignments, send Attach Accept message.Believe the information reporting Route Area Breath identification（Including position area code, route area code）, carry out the renewal of GSM/GPRS network sites area.

Then, multimode terminal establishes signaling connection with target BSS and core net, and triggers the process of Routing Area Update.Eventually End is receiving ROUTING AREA UPDATE ACCEPT message completion Routing Area Update process, and multimode terminal is small in 2G targets Area continues data transfer, successfully completes TD cell reselections to the process of GSM/GPRS networks.

Because in reuse adoption process, multimode terminal needs to be transformed into packet transmission mould from GSM/GPRS network idle patterns Formula, after completing the renewal of route location area and obtaining new IP address, data service could recover.This intersystem reselection process In, business will interrupt the 6-8 seconds, while speed is decreased obviously.

Similarly, during multimode terminal is from GSM/GPRS network reselection to TD-SCDMA network, business will interrupt 6-8 Second, it directly affects the customer perception that user uses multimode terminal.

2nd, the multimode terminal direct handoff technique of ps domain in the connection mode

In the direct handoff technique scheme of ps domain, RNC and BSC are the network elements of two network stand-alone systems, are controlled respectively each From the radio access management of Radio Network System.Multimode terminal under GPRS group modes, using the direct handoff technique of ps domain from GSM/GPRS networks are directly switch in TD-SCDMA network.

It is that multimode terminal is switched to TD- using the direct handoff technique of ps domain from GPRS network in the connection mode below The process of SCDMA networks：

（1）Under GPRS packet transfer modes, multimode terminal carries optimal T D adjacent areas in channel release message Information, reports 2G BSS systems, and judgement is switched over to BSS systems；The process is due to being to switch in the connection mode Judgement, transition between systems flow processing of the multimode terminal under Idle state is not considered；If judgement failure terminal will be in sky Intersystem reselection flow is initiated under not busy state.

（2）The BSC of GPRS network initiates ps domain re-positioning request to CN（Hardover Required）；

（3）Target RNC of the core net CN to 3G（TRNC）RELOCATION REQUEST message is sent so as to TD networks Apply for ps domain resource；

（4）Target RNC is according to the service conditions and Handover toUTRAN IE indicated in RELOCATION REQUEST The UE ability informations of middle instruction, resource allocation is carried out, and return to RELOCATION REQUEST ACK messages；

（5）TD terminals are switched to TD cells, are synchronized in TD cells；

（6）When target TRNC receives UE HANDOVER TO UTRAN COMPLETE, it is believed that switch successfully.

This technology solves does not support asking for ps domain switching under GPRS group modes in intersystem handover Optimizing Flow Topic, shorten the intersystem handover time delay of ps domain business.But the technology can not solve the end of TD terminals in an idle state Off-grid problem is held, can not solve TD terminals can not normally called, also can not be as the called unreachable time.

In above-mentioned 1st kind of existing network there is more defect in the interoperability scheme of GSM network and TD-SCDMA network, such as the institute of table 1 Show, including：

Table 1

Defect 1：Multimode terminal carries out intersystem reselection or the terminal initiation after speech business terminates under Idle state In system interoperation flow, due to no matter from TD-SCDMA network gravity treatment to GSM/GPRS networks, or from GSM/GPRS nets Network gravity treatment will the off-grid 6-8 seconds to TD-SCDMA network, multimode terminal.During intersystem reselection, multimode terminal will be unable to Normally called, can not be also used as called.

Defect 2：Multimode terminal is when doing data service in TD-SCDMA network, when multimode terminal is moved to TD network signals Weak, when GSM network signal is stronger, multimode terminal will will interrupt the 6-8 seconds by intersystem reselection to GSM network, business, simultaneously Speed is decreased obviously.Similarly, during multimode terminal is from GSM/GPRS network reselection to TD-SCDMA network, business also will The 6-8 seconds are interrupted, directly affects the customer perception that user uses multimode terminal.

The direct handoff technique of ps domain solves and is under GPRS group modes above-mentioned 2nd kind of multimode terminal in the connection mode The problem of not supporting PS to switch in handover optimization flow between system, shorten the intersystem handover time delay of PS business.But the technology Can not solve the problems, such as that multimode terminal in an idle state or off-grid of the multimode terminal in reuse adoption process, can not solve multimode Terminal in the unreachable time, can not be called normally herein, can not also be used as the problem of called.

The content of the invention

The present invention be in order to overcome in the prior art communication network occurred from low level network into high-level network reuse adoption process Reselection time it is long influence quality of service the defects of, according to an aspect of the present invention, propose a kind of different systems network weight Choosing method.

Different systems network reselection method according to embodiments of the present invention, including：

Terminate 2G speech businesses or reside in 2G networks multimode terminal intend to 3G network carry out gravity treatment when, multimode terminal hair Play the request of ps domain session service；

For multimode terminal after 2G networks establish connection, the system information acquisition that the BSC by reading 2G networks is issued is adjacent 3G network information；

After the BSC of 2G networks receives the 3G network measurement report that multimode terminal reports, PS of the 2G networks to 3G network is initiated Direct handoff procedure；

Multimode terminal, by 2G network switchings to 3G network, carries out position area and Route Area more according to adjacent 3G network information Newly, and ps domain session service is discharged.

The present invention be in order to overcome in the prior art communication network occurred from low level network into high-level network reuse adoption process Reselection time it is long influence quality of service the defects of, according to another aspect of the present invention, propose a kind of different systems network Gravity treatment system.

Different systems network reselection system according to embodiments of the present invention, including：

Multimode terminal, intend, to during 3G network progress gravity treatment, initiating PS for terminating 2G speech businesses or residing in 2G networks Domain session service request, after 2G networks establish connection, the system information acquisition that the BSC by reading 2G networks is issued is adjacent 3G network information, according to adjacent 3G network information by the 2G network switchings to 3G network, position area and Routing Area Update are carried out, And discharge ps domain session service；

The BSC of 2G networks, after the 3G network measurement report reported for receiving multimode terminal, 2G networks are initiated to 3G network The direct handoff procedures of PS.

The different systems network reselection method and system of the present invention, the multimode terminal in different system terminate 2G speech businesses or 2G networks are resided in intend, to during the progress gravity treatment of the 3G networks such as TD networks, actively initiating the request of ps domain session service, 2G networks After BSC receives the 3G network measurement report that the multimode terminal reports, the direct handoff procedures of PS of 2G networks to 3G network are initiated, Compared with the multimode terminal of the present invention, off-grid time of multimode terminal when to TD network reselections is further reduced, further It ensure that multimode terminal is normally carried out from calling of the 2G networks into TD network switching formula reuse adoption process and data service, carry High service quality of the multimode terminal in 2G networks into 3G network reuse adoption process.

Multimode terminal measures under 2G networks to be obtained after 3G meets gravity treatment switching condition, initiating the gravity treatment to 3G network Journey；

Multimode terminal, by 2G network switchings to the 3G network, carries out position area and Route Area according to adjacent 3G network information Renewal, and discharge ps domain session service.

The present invention be in order to overcome in the prior art communication network occurred from low level network into high-level network reuse adoption process Reselection time it is long influence quality of service the defects of, according to another aspect of the present invention, propose a kind of the more of different systems Mould terminal.

The multimode terminal of different systems according to embodiments of the present invention, including：

Initiation module is asked, intends, to during 3G network progress gravity treatment, sending out for terminating 2G speech businesses or residing in 2G networks Play the request of ps domain session service；

Data obtaining module, for the system information that after 2G networks establish connection, the BSC by reading 2G networks is issued Obtain adjacent 3G network information；

Gravity treatment initiation module, under 2G networks measurement obtain after 3G meets gravity treatment switching condition, initiating to 3G network Reuse adoption process；

Release module is updated, for, by the 2G network switchings to 3G network, carrying out position according to adjacent 3G network information Area and Routing Area Update, and discharge ps domain session service.

The network reselection method and multimode terminal of the different systems of the present invention, the multimode terminal in different system terminate 2G voices Business or reside in 2G networks intend to the 3G networks such as TD networks carry out gravity treatment when, actively initiate ps domain session service ask, After meeting gravity treatment switching condition, multimode terminal directly initiates reuse adoption process from 2G networks to 3G network, relative to existing multimode Terminal terminates 2G speech businesses or resides in 2G networks to intend comparing to the flow of 3G network gravity treatment, greatly reduces multimode terminal and exists To off-grid time during TD network reselections, it ensure that multimode terminal in the calling sum from 2G networks into TD network switching process According to being normally carried out for business, service quality of the multimode terminal in 2G networks into 3G network handoff procedure is improved.

The network reselection method and multimode terminal of different systems of the present invention, compared with the network reselection system of the present invention, only Need to be transformed at multimode terminal, it is not necessary to transform the equipment such as the BSC of network side, saved cost, favorably In the realization of scheme.

Multimode terminal carries out VoIP voice calls on 2G networks, and the source BSS of 2G networks sends PS HandoverRequired message gives source SGSN；

Source SGSN sends Forward Relocation Request message, target MME performance objectives SGW to target MME Reorientation judgement, Create Bearer Request message is sent to target SGW；

Target SGW assignment of home address, feed back Create Bearer Response message to target MME；

Target MME will send Handover Request message requests to target eNB and establish carrying, and target eNB is to target MME sends Handover Request Ack message；

Target MME sends Forward Relocation Response message to source SGSN, and source SGSN is sent to source BSS PS Handover Required Ack message；

Source BSS sends PS handover Command to multimode terminal, and request multimode terminal switches to target eNodeB.

Multimode terminal, for carrying out VoIP voice calls on 2G networks；

The source BSS of 2G networks, source SGSN is given for sending PS handover Required message；

Source SGSN, for sending Forward Relocation Request message to target MME, PS is sent to source BSS Handover Required Ack message；

Target MME, relocate and adjudicate for performance objective SGW, sending Create BearerRequest to target SGW disappears Breath；

Target SGW, for assignment of home address, feed back Create Bearer Response message to target MME；

Target MME, carrying is established for Handover Request message requests will to be sent to target eNB, to source SGSN Send Forward Relocation Response message；

Target eNB, for sending Handover Request Ack message to target MME；

Source BSS, for sending PS handover Command to multimode terminal, multimode terminal is asked to target eNodeB Switching.

Multimode terminal carries out VoIP voice calls on 3G network, and the source RNC of the 3G network is sent RelocationRequired message gives source SGSN；

Source SGSN sends Forward Relocation Request message, the target MME performance objectives to target MME SGW reorientation judgements, Create Bearer Request message is sent to target SGW；

Target MME sends Forward Relocation Response message to source SGSN, and source SGSN is sent to source RNC Relocation Required Ack message；

Source RNC sends PS handover Command to multimode terminal, and request multimode terminal switches to target eNodeB.

Multimode terminal, for carrying out VoIP voice calls on 3G network；

The source RNC of 3G network, source SGSN is given for sending Relocation Required message；

Source SGSN, for sending Forward Relocation Request message to target MME, sent to source RNC Relocation Required Ack message；

Target eNB, for sending Handover Request Ack message to target MME；

The different systems network reselection method and system of the present invention, multimode terminal are real by way of in VoIP voice calls When now from 2G/3G network switchings to LTE network, multimode terminal directly initiates reuse adoption process from 2G/3G networks to LTE network, greatly Reduce multimode terminal to off-grid time during LTE network gravity treatment greatly, ensure that multimode terminal from 2G/3G networks to LTE Calling and data service during network reselection are normally carried out, and improve multimode terminal in 2G/3G networks to LTE network weight Service quality during choosing.

Other features and advantages of the present invention will be illustrated in the following description, also, partly becomes from specification Obtain it is clear that or being understood by implementing the present invention.The purpose of the present invention and other advantages can be by the explanations write Specifically noted structure is realized and obtained in book, claims and accompanying drawing.

Below by drawings and examples, technical scheme is described in further detail.

Brief description of the drawings

Accompanying drawing is used for providing a further understanding of the present invention, and a part for constitution instruction, the reality with the present invention Apply example to be used to explain the present invention together, be not construed as limiting the invention.In the accompanying drawings：

Fig. 1 is the signalling diagram that gravity treatment switches under TD terminal idle modes of the present invention；

Fig. 2 is the signalling diagram that gravity treatment switches under TD terminal speech end of conversation pattern of the present invention；

Fig. 3 is the signalling diagram that PS directly switches under TD terminal idle modes of the present invention；

Fig. 4 is the signalling diagram that PS directly switches under TD terminal speech end of conversation pattern of the present invention；

Fig. 5 is that multimode terminal of the present invention is realized from 2G network switching to LTE network by way of VoIP voice calls Signalling diagram；

Fig. 6 is that multimode terminal of the present invention is switched to LTE network being realized by way of VoIP voice calls from 3G network Signalling diagram.

Embodiment

Below in conjunction with the accompanying drawings, the embodiment of the present invention is described in detail, it is to be understood that the guarantor of the present invention Shield scope is not limited by embodiment.

Embodiment 1：

As shown in figure 1, the signalling diagram switched for gravity treatment under TD terminal idle modes of the present invention, including：

Step 101：Multimode terminal under idle pulley resides in GSM/GPRS cells, meets when detecting between system Gravity treatment thresholding（Thresholding 1）When, multimode terminal actively initiates ps domain session service, and multimode terminal uses MM （MobileManagement, mobile management）Agreement is to CN（Core Network, core net）GPRS attachments are established, are then made Use SM（Session Management, session management）Agreement initiates PDP activation（That is Active PDP ContextRequest）, it is session service that the QoS attributes of wherein PDP Context, which have strict delay requirement, type of service, CN feeds back Active PDP Context Accept to multimode terminal, and mark ps domain session service is successfully established.Carry out step 102；

Step 102：After multimode terminal establishes connection on GSM/GPRS networks, 2G is read（That is GSM/GPRS, similarly hereinafter）Net The system information SI (System Information) that network BSC is issued；2G networks can be in SI Type2quarter by configuration Adjacent TD-SCDMA cell informations（Include the frequency of TD cells, cell parameter）Multimode terminal is broadcast to, multimode terminal is receiving All adjacent TD-SCDMA subdistrict frequency point can be saved in after the information of related cell in 3G cell lists, and according to measurement door Limit value initiates the measurement to TD-SCDMA neighbor cells；

Step 103：When the 3G signals that multimode terminal measures under 2G states meet gravity treatment switching condition, 2G BSC Send Cell Change Order message to multimode terminal, and start timer T3119, keep old channel time enough with Just multimode terminal can return to former channel, and when the message for receiving the new cell of correct access that multimode terminal is sent, BSC releases are wireless Channel；

Step 104：Multimode terminal receives the weight performed after RR-Cell Change Order message to 3G cells Process is selected, RRC is established with Target RNC, core net and is connected, during RRC Connection Establishment, " Establishment cause " IE are Inter-RAT cell change order, and have higher priority, and are touched Route Area, position area associated update process are sent out, carries out step 105- steps 112；

Step 105：After the completion of RRC foundation, multimode terminal sends LOCATION UPDATA REQUEST message to MSC, Location updating is carried out, the information such as old LAC, location updating type are carried in message；

Step 106：Multimode terminal sends Routing Area Update Request message to CN SGSN；

Step 107：Multimode terminal is authenticated with CN and ciphering process；

Step 108：MSC is received and is handled LOCATION UPDATA REQUEST message, generates LOCATION UPDATAACCEPT message is sent to multimode terminal, and new LAI is carried in message；

Step 109：After multimode terminal receives LOCATION UPDATA ACCEPT and handled, TMSI is generated REALLOCATIONCOMPLETE message is sent to SGSN；

Step 110：When 2G and 3G SGSN by PDP Context renewal handle, PDP Context from 2G networks update to In TD-SCDMA network, while SGSN notice 2G network release GPRS resources；

Step 111：SGSN generations Routing Area Update ACCEPT message is sent to multimode terminal, is taken in message With information such as new LAC, RAI；

Step 112：After multimode terminal receives the information such as new LAC, RAC, Routing Area Update are generated COMPLETE message is sent to SGSN；

Step 113：After completing Route Area, position area associated update process, multimode terminal is sent to core net GMMSERVICE REQUEST message, request ps domain RAB are established；CN will trigger RNC and carry out RAB（Radio AccessBearer RAB）A series of processes, the multimode terminals such as foundation continue data service in TD network objectives cells, may be used To carry out calling and called, cell reselection is successfully completed to TD-SCDMA network；

Step 114：After multimode terminal completes data transfer, PDP deactivation flows are actively triggered, CN discharged by RAB, RRC discharges, and multimode terminal becomes Idle state by connected state, resided in TD-SCDMA network, and multimode terminal can be led, quilt Cry.

Embodiment 2：

As shown in Fig. 2 the signalling diagram switched for gravity treatment under TD terminal speech end of conversation pattern of the present invention, including：

Step 201：Multimode terminal carries out voice call in TD-SCDMA network.When under TD-SCDMA network transmission quality During drop, RNC makes decisions switching, and CS domains switching flow between execution system；

Step 202：When multimode terminal receives the Handover from UTRAN Command from RNC, start from 3G to 2G switching；

Step 203：After the completion of switching, multimode terminal sends the declaration of Handover Complete message to MSC and switched to Work(, after switching successfully GSM, voice call continues to keep in GSM network.

Step 204：After core net MSC receives Handover Complete message, Iu is sent to 3G network RNC ReleaseCommand message, to realize the purpose for discharging RNC Internet resources before terminal takes, RNC feedbacks Iu ReleaseComplete gives network element MSC；

Step 205：RNC feedbacks Iu Release Complete give network element MSC, discharges TD Internet resources；

Step 206：Multimode terminal is after GSM network terminates voice call, Disconnect（Hang up the telephone）, into step 207；

Step 207：MSC issues release message to multimode terminal, and waits multimode terminal release Complete, To notify BSC to discharge 2G network wireless transmission channels；

Step 208：Multimode terminal initiates ps domain session service immediately after receiving and issuing release message, and to CN （Core Network, core net）GPRS attachments are established, then using SM（Session Management, session management）Agreement Initiate PDP activation（That is Active PDP Context Request）, the wherein QoS attributes of PDP Context will by strict time delay Ask, type of service is session service, CN feedback multimode terminal Active PDP Context Accept, indicate ps domain session Class business is successfully established.Carry out step 209；

Step 209：After multimode terminal establishes connection on GSM/GPRS networks, the system letter that 2G network Bs SC is issued is read SI (System Information) is ceased, 2G networks can be in SI Type2 quarter by the adjacent TD-SCDMA cells of configuration Information（Include the frequency of TD cells, cell parameter）It is broadcast to multimode terminal, multimode terminal meeting after related cell information is received All adjacent TD-SCDMA subdistrict frequency point is saved in 3G cell lists, and initiated according to measurement threshold value to TD- The measurement of SCDMA neighbor cells；

Step 210：When the 3G signals that multimode terminal measures under 2G states meet that gravity treatment switches:During condition, 2G BSC Send Cell Change Order message to multimode terminal, and start timer T3119, keep old channel time enough with Just multimode terminal can return to former channel, when the message for receiving the new cell of correct access that multimode terminal is sent, the release of 2G networks Former channel resource；

Step 211：Multimode terminal receive performed after Cell Change Order To Utran message it is small to 3G The reuse adoption process in area, establish RRC with Target RNC, core net and be connected, in RRC Connection Establishment processes In, " Establishment cause " IE are Inter-RAT cell change order, and have higher priority, and Trigger Route Area, position area associated update process.Carry out step 212- steps 219；

Step 212：After the completion of RRC foundation, multimode terminal sends LOCATION UPDATAREQUEST message to MSC, Location updating is carried out, the information such as old LAC, location updating type are carried in message；

Step 213：Multimode terminal sends Routing Area Update Request message to CN SGSN；

Step 214：Multimode terminal is authenticated with CN and ciphering process；

Step 215：MSC is received and is handled LOCATION UPDATA REQUEST message, generates LOCATIONUPDATA ACCEPT message is sent to multimode terminal, and new LAI is carried in message；

Step 216：After multimode terminal receives LOCATION UPDATA ACCEPT and handled, generation TMSIREALLOCATION COMPLETE message is sent to SGSN；

Step 217：When 2G and 3G SGSN by PDP Context renewal handle, PDP Context from 2G networks update to In TD-SCDMA network, while SGSN notice 2G network release GPRS resources；

Step 218：SGSN is received and is handled message Routing Area Update Request, and generates Routing AreaUpdate ACCEPT message is sent to multimode terminal, and the information such as new LAI, RAI are carried in message；

Step 219：After multimode terminal receives the information such as new LAI, RAI, Routing Area UpdateCOMPLETE are generated Message is sent to SGSN；

Step 220：After completing Route Area, position area associated update process, multimode terminal is sent to core net GMMSERVICE REQUEST message, request ps domain RAB are established；CN will trigger RNC and carry out RAB（Radio AccessBearer RAB）A series of processes, the multimode terminals such as foundation continue data service in TD network objectives cells, may be used To carry out calling and called, cell reselection is successfully completed to TD-SCDMA network；

Step 221：After multimode terminal completes data transfer, PDP deactivation flows are actively triggered, CN discharged by RAB, RRC discharges, and multimode terminal becomes Idle state by connected state, resided in TD-SCDMA network, and multimode terminal can be led, quilt Cry.

The different systems network reselection method of the embodiment of the present invention one and two, the multimode terminal in different system terminate 2G voices Business or reside in 2G networks intend to the 3G networks such as TD networks carry out gravity treatment when, actively initiate ps domain session service ask, After meeting gravity treatment switching condition, multimode terminal directly initiates reuse adoption process from 2G networks to 3G network, relative to existing multimode Terminal terminates 2G speech businesses or resides in 2G networks to intend comparing to the flow of 3G network gravity treatment, greatly reduces multimode terminal and exists To off-grid time during TD network switchings, it ensure that multimode terminal in the calling sum from 2G networks into TD network switching process According to being normally carried out for business, service quality of the multimode terminal in 2G networks into 3G network handoff procedure is improved.

The different systems network reselection method of the embodiment of the present invention one and two, the network reselection method with embodiment three and four Compare, it is only necessary to transformed at multimode terminal, it is not necessary to the equipment such as the BSC of network side are transformed, saved into This, is advantageous to the realization of scheme.

Embodiment 3：

As shown in figure 3, the signalling diagram directly switched for PS under TD terminal idle modes of the present invention, including：

Step 301：Multimode terminal under idle pulley resides in GSM/GPRS cells, meets when detecting between system Gravity treatment thresholding（Thresholding 1）, multimode terminal actively initiates ps domain session service, and terminal uses MM（MobileManagement, move Mobility management）Agreement is to CN（Core Network, core net）GPRS attachments are established, then using SM（Session Management, session management）Agreement initiates PDP activation（That is Active PDP ContextRequest）, wherein above and below PDP It is session service that the QoS attributes of text, which have strict delay requirement, type of service, CN feedback terminal Active PDP ContextAccept, mark ps domain session service are successfully established.Carry out step 302；

Step 302：After multimode terminal establishes connection on GSM/GPRS networks, the system letter that 2G network Bs SC is issued is read SI (System Information) is ceased, 2G networks can be in SI Type2quarter by the adjacent TD-SCDMA cells of configuration Information（Include the frequency of TD cells, cell parameter）It is broadcast to multimode terminal, multimode terminal meeting after related cell information is received All adjacent TD-SCDMA subdistrict frequency point is saved in 3G cell lists, and to the measurement report of TD-SCDMA adjacent cells Report 2G BSC；

Step 303：After 2G BSC receives the measurement report of multimode terminal, judgement meets intersystem handover thresholding（Thresholding 2）, then BSC initiate intersystem handover process；

Step 304：The BSC systems of GSM/GPRS networks initiate ps domain re-positioning request to CN（PS HardoverRequired）, then CN（Core Network, core net）Sent to the Target RNC of TD-SCDMA network RELOCATION REQUEST message is so as to TD-SCDMA network application resource, Source RNC ToTarget in message RNC Transparent Container IE bring RRC Container message to multimode terminal, are carried in message GPRSHandover to UTRAN IE；

Step 305：Target RNC（Target RNC）According to the service conditions indicated in RELOCATION REQUEST, root According to the ability information of the multimode terminal indicated in the Handover to UTRAN IE of acquisition, resource allocation is carried out；

Step 306：Target RNC（Target RNC）RELOCATION REQUESTACK message is sent to CN, wherein HANDOVER TO are carried in Target RNC to Source RNC Transparent Container IE UTRANCOMMAND orders（Or for GERAN in Iu mode, carry RB RECONFIGURATION）；

Step 307：CN SGSN issues PS Handover Command orders to the BSC systems of GSM/GPRS networks, and Multimode terminal is issued to by BSC；

Step 308：Target RNC（Target RNC）After detecting multimode terminal, to CN（SGSN）Send RelocationDetect message, carry out reorientation detection；

Step 309：It is synchronous with the foundation of TD cells after multimode terminal is switched to TD cells, and to Target RNC（Target RNC）HANDOVER TO UTRAN COMPLETE are initiated, as Target RNC（Target RNC）The message is received, represents that multimode is whole End switching is completed；

Step 310：When multimode terminal obtains new RNTI by Uu mouths（Radio Network Temporary Identifier）With Target RNC ID Afterwards, Target RNC is to CN（SGSN）Relocation Complete message is sent, illustrates that Target RNC and SGSN ps domain carrying are logical Road has built up.

Step 311：CN sends Clear Command to the BSC systems of GSM/GPRS networks, to discharge multimode terminal occupancy The resource of 2G networks；After BSC discharges resource, reply Clear Complete and represent release resource, multimode terminal departs from GSM/ GPRS network；

Step 312：When multimode terminal is after the completion of switching, and trigger position area, Route Area associated update process, carry out with Lower step 3121- steps 3127：

Step 3121：Multimode terminal sends LOCATION UPDATA REQUEST message to MSC, carries out location updating, disappears The information such as old LAC, location updating type are carried in breath；

Step 3122：Multimode terminal sends Routing Area Update Request message to CN SGSN；

Step 3123：Multimode terminal is authenticated with CN and ciphering process；

Step 3124：MSC is received and is handled LOCATION UPDATA REQUEST message, generation LOCATIONUPDATAACCEPT message is sent to multimode terminal, and new LAI is carried in message；

Step 3125：After multimode terminal receives LOCATION UPDATA ACCEPT and handled, generation TMSIREALLOCATION COMPLETE message is sent to SGSN；

Step 3126：SGSN is received and is handled message Routing Area Update Request, and generates Routing AreaUpdate ACCEPT message is sent to multimode terminal, and the information such as new LAI, RAI are carried in message；

Step 3127：After multimode terminal receives the information such as new LAI, RAI, Routing Area are generated UpdateCOMPLETE message is sent to SGSN；

Step 313：After completing Route Area, position area associated update process, multimode terminal continues in TD network objectives cell Carry out data service, it is already possible to carry out calling and called, successfully complete cell reselection to TD-SCDMA network；

Step 314：After multimode terminal completes data transfer, PDP deactivation flows are actively triggered, CN discharged by RAB, RRC discharges, and multimode terminal becomes Idle state by connected state, resided in TD-SCDMA network, and multimode terminal can be led, quilt Cry.

Wherein, in step 301, under GSM/GPRS idle pulleys, intersystem reselection thresholding 1 mainly considers to the greatest extent TD terminals Amount enables TD terminals more easily to reside in TD-SCDMA network, while also reduces ping-pong reselection or switching phenomenon generation. The thresholding is related to two parameters of Qsearch_I and TDD_Qoffset of network side.Qsearch_I is isosystem measurement thresholding, when When GSM signal levels are below or above threshold value, start to TD-SCDMA cell measurements, as shown in table 2.

Table 2

TDD_Qoffset is TD-SCDMA network level absolute value decision threshold, and the present invention is defined as when TD-SCDMA believes When number level is higher than thresholding, UE just initiates the calling of ps domain specific transactions, and same TDD_Qoffset also disappears in GSM BCCH systems Issued in breath, concrete meaning is as shown in table 3.

Table 3

Embodiment 4：

As shown in figure 4, the signalling diagram directly switched for PS under TD terminal speech end of conversation pattern of the present invention, bag Include：

Step 401：Multimode terminal carries out voice call in TD-SCDMA network, when under TD-SCDMA network transmission quality Drop, RNC make decisions switching, and CS domains switching flow between execution system；

Step 402：When multimode terminal receives the Handover from UTRAN Command from RNC, start from 3G to 2G switching；

Step 403：After the completion of switching, multimode terminal sends the declaration of Handover Complete message to MSC and switched to Work(, after switching successfully GSM, voice call continues to keep in GSM network；

Step 404：After core net MSC receives Handover Complete message, Iu is sent to 3G network RNC ReleaseCommand message, to realize the purpose for discharging RNC Internet resources before multimode terminal takes, RNC feedbacks IuRelease Complete give network element MSC；

Step 405：RNC feedbacks Iu Release Complete give network element MSC, discharges TD Internet resources；

Step 406：Multimode terminal is after GSM network terminates voice call, Disconnect（Hang up the telephone）, into step 407；

Step 407：MSC issues release message to multimode terminal, and waits multimode terminal release Complete, To notify BSC to discharge 2G network wireless transmission channels；

Step 408：Multimode terminal initiates ps domain session service immediately after receiving and issuing release message, and to CN （Core Network, core net）GPRS attachments are established, then using SM（Session Management, session management）Agreement Initiate PDP activation（That is Active PDP Context Request）, the wherein QoS attributes of PDP Context will by strict time delay Ask, type of service is session service, CN feedback terminal Active PDP Context Accept, indicate ps domain conversation class industry Business is successfully established.Carry out step 409；

Step 409：After multimode terminal establishes connection on GSM/GPRS networks, the system letter that 2G network Bs SC is issued is read SI (System Information) is ceased, 2G networks can be in SI Type2 quarter by the adjacent TD-SCDMA cells of configuration Information is broadcast to terminal, and multimode terminal can protect all adjacent TD-SCDMA subdistrict frequency point after related cell information is received It is stored in 3G cell lists, and 2G BSC is reported to the measurement reports of TD-SCDMA neighbor cells；

Step 410：After 2G BSC receives the measurement report of multimode terminal, judgement meets intersystem handover thresholding（Thresholding 2）, then BSC initiate intersystem handover process；

Step 411：The BSC systems of GSM/GPRS networks initiate ps domain re-positioning request to CN（PS HardoverRequired）, then CN（Core Network, core net）Sent to the Target RNC of TD-SCDMA network RELOCATION REQUEST message is so as to TD-SCDMA network application resource, Source RNC ToTarget in message The RRC Container message that RNC Transparent Container IE are brought to multimode terminal, GPRS is carried in message Handover to UTRAN IE（Or for GERAN in Iu mode, carry RB RECONFIGURATION）；

Step 412：Target RNC（Target RNC）According to the service conditions indicated in RELOCATION REQUEST, root According to the ability information of the multimode terminal indicated in the Handover to UTRAN IE of acquisition, resource allocation is carried out；

Step 413：Target RNC（Target RNC）RELOCATION REQUEST ACK messages are sent to CN, wherein HANDOVER TO are carried in Target RNC to Source RNC Transparent Container IE UTRANCOMMAND orders；

Step 414：CN SGSN issues PS Handover Command orders to the BSC systems of GSM/GPRS networks, and Multimode terminal is issued to by BSC；

Step 415：Target RNC（Target RNC）After detecting multimode terminal, to CN（SGSN）Send RelocationDetect message, carry out reorientation detection；

Step 416：It is synchronous with the foundation of TD cells after multimode terminal is switched to TD cells, and to Target RNC（Target RNC）HANDOVER TO UTRAN COMPLETE are initiated, as Target RNC（Target RNC）The message is received, represents that multimode is whole End switching is completed；

Step 417：When multimode terminal obtains new RNTI by Uu mouths（Radio Network Temporary Identifier）With Target RNC ID Afterwards, Target RNC is to CN（SGSN）Relocation Complete message is sent, illustrates that Target RNC and SGSN ps domain carrying are logical Road has built up.

Step 418：CN sends Clear Command to the BSC systems of GSM/GPRS networks, to discharge multimode terminal occupancy The resource of 2G networks；After BSC discharges resource, reply Clear Complete and represent release resource, terminal departs from GSM/GPRS Network；

Step 419：When multimode terminal is after the completion of switching, and trigger position area, Route Area associated update process.Carry out with Lower step:4191- steps 4197：

Step 4191：Multimode terminal sends LOCATION UPDATA REQUEST message to MSC, carries out location updating, disappears The information such as old LAC, location updating type are carried in breath；

Step 4192：Multimode terminal sends Routing Area Update Request message to CN SGSN；

Step 4193：Multimode terminal is authenticated with CN and ciphering process；

Step 4194：MSC is received and is handled LOCATION UPDATA REQUEST message, generation LOCATIONUPDATAACCEPT message is sent to multimode terminal, and new LAI is carried in message；

Step 4195：After multimode terminal receives LOCATION UPDATA ACCEPT and handled, generation TMSIREALLOCATION COMPLETE message is sent to SGSN；

Step 4196：SGSN is received and is handled message Routing Area Update Request, and generates Routing AreaUpdate ACCEPT message is sent to multimode terminal, and the information such as new LAI, RAI are carried in message；

Step 4197：After multimode terminal receives the information such as new LAI, RAI, Routing Area are generated UpdateCOMPLETE message is sent to SGSN.

Step 420：After completing Route Area, position area associated update process, multimode terminal continues in TD network objectives cell Carry out data service, it is already possible to carry out calling and called, successfully complete cell reselection to TD-SCDMA network；

Step 421：After multimode terminal completes data transfer, PDP deactivation flows are actively triggered, CN discharged by RAB, RRC discharges, and multimode terminal becomes Idle state by connected state, resided in TD-SCDMA network, and multimode terminal can be led, quilt Cry.

The different systems network reselection method of the embodiment of the present invention three and four, the multimode terminal in different system terminate 2G voices Business or reside in 2G networks intend to the 3G networks such as TD networks carry out gravity treatment when, actively initiate ps domain session service ask, 2G After the BSC of network receives the 3G network measurement report that the multimode terminal reports, initiate 2G networks and directly cut to the PS of 3G network Process is changed, compared with the network reselection method of embodiment one and two, further reduces multimode terminal when to TD network switchings The off-grid time, further ensure multimode terminal from calling of the 2G networks into TD network switching process and data service It is normally carried out, improves service quality of the multimode terminal in 2G networks into 3G network handoff procedure.

Embodiment 5：

As shown in figure 5, for multimode terminal of the present invention realized by way of VoIP voice calls from 2G network switchings to The signalling diagram of LTE network, wherein, VoIP voice calls are to carry voice call in Voice over IP call or ps domain, VoIP is conversation class data service, including：

Step 501：Multimode terminal carries out VoIP voice calls on GPRS/EDGE networks, when multimode terminal detects LTE During network, RRC connections are established, completion is switched to LTE network resource reservation；

Step 502：VoIP voice calls access GPRS/EDGE network systems, and source BSS determines to initiate different systems switching, Multimode terminal is switched to LTE network；Now, upstream and downstream user data all by the radio bearer between multimode terminal and source BSS, BSSGP PFC between source BSS and source SGSN（PacketFlow Context packet flow contexts）Tunnel, source SGSN, target GTP between SGW and PGW（GPRS Tunnel Protocol）Tunnel transmission；

Step 503：Source BSS sends PS handover Required message and gives source SGSN, request CN target eNodeB, Connection is established in target MME and target SGW, TLLI is included in message（Temporary Link Layer identifies）, reason, cell-of-origin information, mesh Mark eNB information, transparent transmission unit and activation PFC（Packet flow context）List；

Step 504：Source SGSN judges that PS handover Required are from 2G networks PS from Target eNB id informations It is switched to LTE network, source SGSN sends Forward Relocation Request message to target MME, message package including IMS I, Target identification, EPS Context Priorities；

Step 505：Target MME performance objectives SGW reorientation judgements, target MME send CreateBearer to target SGW Request message, including the MME addresses of IMSI, chain of command, user plane PGW addresses, S5/S8 interface protocols；

Step 505a：Target SGW assignment of home address, feed back Create Bearer Response message to target MME；

Step 506：Target MME will send Handover Request to target eNB and require to establish carrying, and message includes The EPS that terminal iidentification, integrity protection information, encryption information, needs are established carries list and target to source transparent transmission unit；

Step 506a：Target eNB sends Handover Request Ack message to target MME, shows that target eNB can be with Prepare to receive the packet transmitted from SGW；

Step 507：Target MME sends ForwardRelocationResponse message to source SGSN, before being included in message Change instruction to reorientation reason, the address of data forwarding and TEID and target SGW；

Step 508：Source SGSN sends PS Handover Required Ack message to source BSS and completes switching preparation rank Section, packet contain TLLI（Temporary Link Layer identifies）, and the packet traffic identifier to be established in target side, and from target MME The reason for receiving is worth；

Step 509：Source BSS sends PS handover Command to multimode terminal, it is desirable to which multimode terminal is to target ENodeB switches, and includes the related special identifier of PS switchings：GERAN PS Handover to E-UTRAN；

Step 510：Multimode terminal carries out access procedure in E-UTRAN networks；

Step 511：After multimode terminal is linked into target eNB, Handover To E-UTRAN Complete are sent；

Step 512：After multimode terminal is successfully accessed to target eNB, target eNB sends handoff notification message notice target MME, message include TAI and ECGI；

Step 513：Target MME learns that multimode terminal has arrived at LTE networkings, sends Forward RelocationComplete notification messages give source SGSN, source SGSN to stop data forwarding；

Step 513a：Source SGSN sends Forward Relocation Complete Ack message and gives target MME；

Step 514：Target MME notice target SGW handoff procedures have been completed, and sending modification carrying request to target SGW disappears Breath explanation target MME is now responsible for control and establishes all EPS carryings for UE；

Step 515：Target SGW notifies the change of some information of PGW, as reorientation or RAT types occur for target SGW Change, these information are sent by changing bearing request message；

Step 516：Target SGW confirms that user plane is converted, is sent to MME and changes bearing response message, while with Message provides target SGW user plane address and TEID, PGW address and TEID.

Now, the user plane path of all carryings is established between UE and target eNB, target SGW and PGW；

Step 517：Source SGSN initiates to perform BSS stream of packets deletion process to source BSS, removes all moneys of GERAN networks Source；

Step 518：When the trigger condition that TA meets meets, multimode terminal initiates TA renewal processes；

Step 519：Multimode terminal carries out VoIP voice calls on an LTE network.

Embodiment 6：

As shown in fig. 6, it is switched to for multimode terminal of the present invention being realized by way of VoIP voice calls from 3G network The signalling diagram of LTE network, wherein, VoIP voice calls are to carry voice call in Voice over IP call or ps domain, VoIP is conversation class data service, including：

Step 601：Multimode terminal carries out VoIP voice calls in TD-SCDMA network.When multimode terminal detects LTE During network, RRC connections are established, completion is switched to LTE network resource reservation；

Step 602：The TD-SCDMA network system of VoIP voice calls access, source RNC determine that initiating different systems switches, Switch the terminal into LTE network；Now, upstream and downstream user data all by the radio bearer between terminal and source RNC, source RNC and GTP between the SGSN of source between tunnel, source SGSN and target SGW and PGW（GPRS Tunnel Protocol）Tunnel transmission；

Step 603：Source RNC sends Relocation Required message and gives source SGSN, request CN target eNodeB, Connection is established in target MME and target SGW, TLLI is included in message（Temporary Link Layer identifies）, reason, cell-of-origin information, mesh Mark eNB information, transparent transmission unit and activation PFC（Packet flow context）List；

Step 604：Source SGSN judges that Relocation Required are from TD-SCDMA from Target eNB id informations Network PS is switched to LTE network.Source SGSN sends Forward Relocation Request message, message package to target MME Including IMS I, target identification, EPS Context Priorities；

Step 605：Target MME performance objectives SGW reorientation judgements, target MME send CreateBearer to target SGW Request message, including the MME addresses of IMSI, chain of command, user plane PGW addresses, S5/S8 interface protocols；

Step 605a：Target SGW assignment of home address, feed back Create Bearer Response message to target MME；

Step 606：Target MME will send Handover Request to target eNB and require to establish carrying, and message includes The EPS that terminal iidentification, integrity protection information, encryption information, needs are established carries list and target to source transparent transmission unit；

Step 606a：Target eNB sends Handover Request Ack message to target MME, shows that target eNB can be with Prepare to receive the packet transmitted from target SGW；

Step 607：Target MME sends Forward Relocation Response message to source SGSN, is included in message Forward direction reorientation reason, the address of data forwarding and TEID and SGW change instruction；

Step 608：Source SGSN sends Relocation Required Ack message to source RNC and completes handoff preparation phase, Packet contains TLLI（Temporary Link Layer identifies）, and the packet traffic identifier to be established in target side, and received from target MME The reason for be worth；

Step 609：Source RNC sends PS handover Command to multimode terminal, it is desirable to which terminal is cut to target eNodeB Change, and include the related special identifier of PS switchings：UTRAN PS Handover to E-UTRAN；

Step 610：Multimode terminal carries out access procedure in E-UTRAN networks；

Step 611：After multimode terminal is linked into target eNB, Handover To E-UTRAN Complete are sent；

Step 612：After multimode terminal is successfully accessed to target eNB, target eNB sends handoff notification message notice target MME, message include TAI and ECGI；

Step 613：Target MME learns that multimode terminal has arrived at LTE networkings, sends Forward RelocationComplete notification messages give source SGSN, source SGSN to stop data forwarding；

Step 613a：Source SGSN sends Forward Relocation Complete Ack message and gives target MME；

Step 614：Target MME notice target SGW handoff procedures have been completed, and sending modification carrying request to target SGW disappears Breath explanation target MME is now responsible for control and establishes all EPS carryings for UE；

Step 615：Target SGW notifies the change of some information of PGW, as reorientation or RAT types occur for target SGW Change, these information are sent by changing bearing request message；

Step 616：Target SGW confirms that user plane is converted, is sent to MME and changes bearing response message, while with Message provides SGW user plane address and TEID, PGW address and TEID.

Now, the user plane path of all carryings is established between UE and target eNB, target SGW and PGW.

Step 617：Source SGSN initiates to perform RNC stream of packets deletion process to source RNC, removes all of TD-SCDMA network Resource；

Step 618：When the trigger condition that TA meets meets, multimode terminal initiates TA renewal processes；

Step 619：Multimode terminal carries out VoIP voice calls on an LTE network.

The different systems network reselection method of the embodiment of the present invention five and six, multimode terminal pass through in VoIP voice calls When mode is realized from 2G/3G network switchings to LTE network, multimode terminal directly initiates gravity treatment from 2G/3G networks to LTE network Journey, off-grid time of the multimode terminal when switching to LTE network is greatly reduced, ensure that multimode terminal from 2G/3G networks Calling and data service into LTE network handoff procedure are normally carried out, and improve multimode terminal in 2G/3G networks to LTE Service quality in network switching process.

Embodiment 7：

According to embodiments of the present invention, a kind of different systems network reselection system is disclosed, including：

The system of the present invention also includes：

The BSC of 2G networks, it is additionally operable to initiate ps domain re-positioning request to core net, and PS HandoverCommand is referred to Order is issued to the multimode terminal；

Core net, for the target radio network controller application 3G network resource of 3G network；

The target radio network controller of 3G network, for sending RELOCATION REQUESTACK to the core net Message, after detecting multimode terminal, Relocation Detect message is sent to the SGSN of core net, carries out reorientation detection；

The SGSN of core net, for issuing PS Handover Command instructions to the BSC of 2G networks.

The system of the present invention also includes：

Multimode terminal, for obtaining new Radio Network Temporary Identifier and target radio network from adjacent 3G network information Controller ID；

Target radio network controller, for sending Relocation Complete message to the SGSN of core net；

The SGSN of core net, for sending Clear Command instructions to the BSC of 2G networks, accounted for discharging multimode terminal 2G networks.

The system of the present invention also includes：

The multimode terminal, for sending LOCATION UPDATA REQUEST message to the MSC of 3G network, enter line position Renewal is put, LAC, location updating type information before gravity treatment are carried in LOCATION UPDATA REQUEST message, to core net SGSN send Routing Area Update Request message, authenticated and encrypted with core net, according to LOCATION UPDATA ACCEPT message generation TMSIREALLOCATION COMPLETE message is sent to SGSN, according to new LAI and RAI Information generation Routing Area UpdateCOMPLETE message is sent to SGSN；

The MSC of 3G network, for carrying new LAI's according to the generation of LOCATION UPDATA REQUEST message LOCATION UPDATA ACCEPT message is sent to multimode terminal；

SGSN, for carrying new LAI and RAI information according to the generation of Routing Area Update Request message Routing Area Update ACCEPT message be sent to multimode terminal.

The different systems network reselection system of the embodiment of the present invention seven, the multimode terminal in different system terminate 2G speech businesses Or reside in 2G networks and intend, to during the progress gravity treatment of the 3G networks such as TD networks, actively initiating the request of ps domain session service, 2G networks BSC receive the 3G network measurement report that the multimode terminal reports after, initiate 2G networks and directly switched to the PS of 3G network Journey, compared with the multimode terminal of embodiment eight, off-grid time of multimode terminal when to TD network switchings is further reduced, is entered One step ensure that multimode terminal is normally carried out from calling of the 2G networks into TD network switching process and data service, improve Service quality of the multimode terminal in 2G networks into 3G network handoff procedure.

Embodiment 8：

According to embodiments of the present invention, a kind of multimode terminal of different systems is disclosed, including：

Wherein：

Gravity treatment initiation module includes：

Message sink submodule, the Cell Change Order message that the BSC for receiving 2G networks is sent；

Setting up submodule is connected, for establishing RRC with target radio network controller, core net and being connected.

The multimode terminal of the present invention also includes：

Location updating module, for sending LOCATION UPDATA REQUEST message to the MSC of 3G network, enter line position Renewal is put, LAC, location updating type information before gravity treatment are carried in LOCATION UPDATA REQUEST message；

Message transmission module, for sending Routing Area Update Request message to the SGSN of core net；

Authentication ciphering module, for being authenticated and being encrypted with core net；

First message generation module, for being generated according to LOCATION UPDATA ACCEPT message TMSIREALLOCATION COMPLETE message is sent to SGSN；

Second message generating module, disappeared according to new LAI and RAI information generation Routing AreaUpdateCOMPLETE Breath is sent to SGSN.

The multimode terminal of the different systems of the embodiment of the present invention eight, the multimode terminal in different system terminate 2G speech businesses or 2G networks are resided in intend, to during the progress gravity treatment of the 3G networks such as TD networks, actively initiating the request of ps domain session service, meeting weight After selecting switching condition, multimode terminal directly initiates reuse adoption process from 2G networks to 3G network, relative to existing multimode terminal knot Beam 2G speech businesses reside in 2G networks and intend comparing to the flow of 3G network gravity treatment, greatly reduce multimode terminal to TD nets Off-grid time when network switches, it ensure that multimode terminal in the calling and data service from 2G networks into TD network switching process Be normally carried out, improve service quality of the multimode terminal in 2G networks into 3G network handoff procedure.

The multimode terminal of the different systems of the embodiment of the present invention eight, compared with the network reselection system of embodiment seven, it is only necessary to To be transformed at multimode terminal, it is not necessary to the equipment such as the BSC of network side are transformed, have saved cost, are advantageous to The realization of scheme.

Embodiment 9：

Multimode terminal, for carrying out VoIP voice calls on 2G networks；

Target eNB, for sending Handover Request Ack message to target MME；

System also includes：

Target eNB, for after multimode terminal is successfully accessed to target eNB, sending handoff notification message notice target MME；

Target MME, source SGSN is given for sending Forward Relocation Complete notification messages, to target SGW Send modification bearing request message；

Target SGW, for sending modification bearing response message to target MME, while provide SGW with bearing response message and use Family flat address and TEID, PGW address and TEID, the change of PGW information is notified according to the modification bearing request message of reception；

Source SGSN, target MME is given for sending Forward Relocation Complete Ack message.

Embodiment 10：

Multimode terminal, for carrying out VoIP voice calls on 3G network；

Target eNB, for sending Handover Request Ack message to target MME；

The system of the present invention also includes：

The different systems network reselection system of the embodiment of the present invention nine and ten, multimode terminal pass through in VoIP voice calls When mode is realized from 2G/3G network switchings to LTE network, multimode terminal directly initiates gravity treatment from 2G/3G networks to LTE network Journey, off-grid time of the multimode terminal when switching to LTE network is greatly reduced, ensure that multimode terminal from 2G/3G networks Calling and data service into LTE network handoff procedure are normally carried out, and improve multimode terminal in 2G/3G networks to LTE Service quality in network switching process.

The present invention can have a variety of various forms of embodiments, above by taking Fig. 1-Fig. 6 as an example with reference to accompanying drawing to this hair Bright technical scheme explanation for example, this is not meant to that the instantiation that the present invention is applied can only be confined to specific flow Or in example structure, one of ordinary skill in the art is it is to be appreciated that specific embodiment presented above is a variety of Some examples in its preferred usage, any embodiment for embodying the claims in the present invention all should be wanted in technical solution of the present invention Within the scope of asking protection.

Finally it should be noted that：The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, Although the present invention is described in detail with reference to the foregoing embodiments, for those skilled in the art, it still may be used To be modified to the technical scheme described in foregoing embodiments, or equivalent substitution is carried out to which part technical characteristic. Within the spirit and principles of the invention, any modification, equivalent substitution and improvements made etc., it should be included in the present invention's Within protection domain.

Claims

A kind of 1. different systems network reselection method, it is characterised in that including：

Terminate 2G speech businesses or reside in 2G networks multimode terminal intend to 3G network carry out gravity treatment when, multimode terminal hair Play the request of ps domain session service；

For the multimode terminal after 2G networks establish connection, the system information acquisition that the BSC by reading 2G networks is issued is adjacent 3G network information；

After the BSC of 2G networks receives the 3G network measurement report that the multimode terminal reports, PS of the 2G networks to 3G network is initiated Direct handoff procedure；

The multimode terminal, by the 2G network switchings to the 3G network, carries out position area according to the adjacent 3G network information And Routing Area Update, and discharge the ps domain session service.
2. according to the method for claim 1, it is characterised in that the 2G networks are GSM/GPRS networks, the 3G network For TD-SCDMA network.
3. method according to claim 1 or 2, it is characterised in that the 2G networks directly switched to the PS of 3G network Journey includes：

The BSC of 2G networks initiates ps domain re-positioning request, target radio network control of the core net to 3G network to core net Device application 3G network resource processed；

The target radio network controller sends RELOCATION REQUEST ACK messages to the core net；

The BSC of the SGSN of the core net to 2G networks issues PS Handover Command instructions, and is issued by the BSC To the multimode terminal；

After the target radio network controller detects the multimode terminal, sent to the SGSN of the core net Relocation Detect message, carries out reorientation detection.
4. method according to claim 1 or 2, it is characterised in that the multimode terminal is believed according to the adjacent 3G network Breath is included by the 2G network switchings to the step of 3G network：

The multimode terminal obtains new Radio Network Temporary Identifier and target radio network from the adjacent 3G network information After controller ID, target radio network controller sends Relocation Complete message to the SGSN of core net；

The SGSN of the core net sends Clear Command instructions to the BSC of 2G networks, is taken with discharging the multimode terminal 2G networks.
5. method according to claim 1 or 2, it is characterised in that described the step of carrying out position area and Routing Area Update Including：

The multimode terminal sends LOCATION UPDATA REQUEST message to the MSC of 3G network, carries out location updating, institute State LAC, location updating type information before gravity treatment is carried in LOCATION UPDATA REQUEST message；

The multimode terminal sends Routing Area Update Request message to the SGSN of core net；

The multimode terminal is authenticated and encrypted with the core net；

The MSC carries new LAI LOCATION according to LOCATION UPDATA REQUEST message generation UPDATA ACCEPT message is sent to the multimode terminal；

The multimode terminal generates TMSI REALLOCATION according to the LOCATION UPDATA ACCEPT message COMPLETE message is sent to the SGSN；

The SGSN carries new LAI and RAI information according to Routing Area Update Request message generation Routing Area Update ACCEPT message is sent to the multimode terminal；

The multimode terminal generates Routing Area UpdateCOMPLETE message hair according to the new LAI and RAI information Give SGSN.
A kind of 6. different systems network reselection method, it is characterised in that including：

Terminate 2G speech businesses or reside in 2G networks multimode terminal intend to 3G network carry out gravity treatment when, multimode terminal hair Play the request of ps domain session service；

For the multimode terminal after 2G networks establish connection, the system information acquisition that the BSC by reading 2G networks is issued is adjacent 3G network information；

The multimode terminal measures under 2G networks to be obtained after the 3G meets gravity treatment switching condition, initiating the gravity treatment to 3G network Process；

The multimode terminal, by the 2G network switchings to the 3G network, carries out position area according to the adjacent 3G network information And Routing Area Update, and discharge the ps domain session service.
7. according to the method for claim 6, it is characterised in that the 2G networks are GSM/GPRS networks, the 3G network For TD-SCDMA network.
8. the method according to claim 6 or 7, it is characterised in that described the step of initiating to the reuse adoption process of 3G network Including：

The multimode terminal receives the Cell Change Order message that the BSC of 2G networks is sent；

Establish RRC with target radio network controller, core net and be connected.
9. the method according to claim 6 or 7, it is characterised in that described the step of carrying out position area and Routing Area Update Including：

The multimode terminal sends LOCATION UPDATA REQUEST message to the MSC of 3G network, carries out location updating, institute State LAC, location updating type information before gravity treatment is carried in LOCATION UPDATA REQUEST message；

The multimode terminal sends Routing Area Update Request message to the SGSN of core net；

The multimode terminal is authenticated and encrypted with the core net；

The MSC carries new LAI LOCATION according to LOCATION UPDATA REQUEST message generation UPDATA ACCEPT message is sent to the multimode terminal；

The multimode terminal generates TMSI REALLOCATION according to the LOCATION UPDATA ACCEPT message COMPLETE message is sent to the SGSN；

The SGSN carries new LAI and RAI information according to Routing Area Update Request message generation Routing Area Update ACCEPT message is sent to the multimode terminal；

The multimode terminal generates Routing Area UpdateCOMPLETE message hair according to the new LAI and RAI information Give SGSN.
A kind of 10. different systems network reselection system, it is characterised in that including：

Multimode terminal, intend, to during 3G network progress gravity treatment, initiating ps domain meeting for terminating 2G speech businesses or residing in 2G networks Class service request is talked about, after 2G networks establish connection, the system information that the BSC by reading 2G networks is issued obtains adjacent 3G nets Network information, according to the adjacent 3G network information by the 2G network switchings to the 3G network, carry out position area and Route Area Renewal, and discharge the ps domain session service；

The BSC of 2G networks, after the 3G network measurement report reported for receiving the multimode terminal, 2G networks are initiated to 3G network The direct handoff procedures of PS.
11. system according to claim 10, it is characterised in that also include：

The BSC of 2G networks, it is additionally operable to initiate ps domain re-positioning request to core net, and PS Handover Command is instructed It is issued to the multimode terminal；

Core net, for the target radio network controller application 3G network resource of 3G network；

The target radio network controller of 3G network, disappear for sending RELOCATION REQUEST ACK to the core net Breath, after detecting the multimode terminal, Relocation Detect message is sent to the SGSN of core net, carries out reorientation inspection Survey；

The SGSN of core net, for issuing PS Handover Command instructions to the BSC of 2G networks.
12. system according to claim 11, it is characterised in that also include：

The multimode terminal, for obtaining new Radio Network Temporary Identifier and Target Wireless from the adjacent 3G network information Network controller ID；

The target radio network controller, for sending RelocationComplete message to the SGSN of core net；

The SGSN of the core net, it is whole to discharge the multimode for sending Clear Command instructions to the BSC of 2G networks Hold the 2G networks taken.
13. system according to claim 12, it is characterised in that also include：

The multimode terminal, for sending LOCATION UPDATA REQUEST message to the MSC of 3G network, carry out position more Newly, LAC, location updating type information before gravity treatment are carried in the LOCATION UPDATA REQUEST message, to core net SGSN send Routing Area Update Request message, authenticated and encrypted with the core net, according to described LOCATION UPDATA ACCEPT message generation TMSI REALLOCATION COMPLETE message is sent to the SGSN, root SGSN is sent to according to new LAI and RAI information generation Routing Area UpdateCOMPLETE message；

The MSC of 3G network, for carrying new LAI's according to LOCATION UPDATA REQUEST message generation LOCATION UPDATA ACCEPT message is sent to the multimode terminal；

The SGSN, for carrying new LAI and RAI according to Routing Area Update Request message generation The Routing Area Update ACCEPT message of information is sent to the multimode terminal.
A kind of 14. multimode terminal of different systems, it is characterised in that including：

Initiation module is asked, intends, to during 3G network progress gravity treatment, initiating PS for terminating 2G speech businesses or residing in 2G networks Domain session service request；

Data obtaining module, obtained for the system information that after 2G networks establish connection, the BSC by reading 2G networks is issued Adjacent 3G network information；

Gravity treatment initiation module, under 2G networks measurement obtain after the 3G meets gravity treatment switching condition, initiating to 3G network Reuse adoption process；

Release module is updated, for, by the 2G network switchings to the 3G network, being carried out according to the adjacent 3G network information Position area and Routing Area Update, and discharge the ps domain session service.
15. multimode terminal according to claim 14, it is characterised in that the gravity treatment initiation module includes：

Message sink submodule, the Cell Change Order message that the BSC for receiving 2G networks is sent；

Setting up submodule is connected, for establishing RRC with target radio network controller, core net and being connected.
16. multimode terminal according to claim 14, it is characterised in that also include：

Location updating module, for sending LOCATION UPDATA REQUEST message to the MSC of 3G network, carry out position more Newly, LAC, location updating type information before gravity treatment are carried in the LOCATION UPDATA REQUEST message；

Message transmission module, for sending Routing Area Update Request message to the SGSN of core net；

Authentication ciphering module, for being authenticated and being encrypted with the core net；

First message generation module, for generating TMSI according to the LOCATION UPDATA ACCEPT message REALLOCATION COMPLETE message is sent to SGSN；

Second message generating module, Routing Area UpdateCOMPLETE message is generated according to new LAI and RAI information It is sent to SGSN.