CN102325355B - Method for switching to CS (Counter-Strike) network, measuring CS network and realizing CS business and equipment - Google Patents
Method for switching to CS (Counter-Strike) network, measuring CS network and realizing CS business and equipment Download PDFInfo
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Abstract
The embodiment of the invention discloses a method for switching to a CS (Counter-Strike) network, measuring the CS network and realizing CS business and equipment. The method for switching to the CS network comprises: location of a user in an IP (Internet Protocol) network, establishment of a logic channel between the user and an interconnected functional entity, and access of the user into the CS network through the interconnected functional entity; establishment of CS voice conversations in the IP network by the user through the interconnected functional entity; and triggering of switching to the CS network through the IP network, and switching of the CS voice conversations to the CS network through the interconnected functional entity. By adopting the method and the equipment, the voice conversations can be switched to the CS network from the IP network, and the voice calling continuity between the IP network and the CS network can be maintained.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of CS of being switched to network, measure CS network, realize the method and apparatus of CS business.
Background technology
Universal mobile telecommunications system (Universal Mobile Telecommunications System, UMTS) is the 3-G (Generation Three mobile communication system) that adopts WCDMA air interface technologies, conventionally also UMTS system is called to WCDMA communication system.UMTS system has adopted and the similar structure of second generation mobile communication system, comprises Radio Access Network (Radio Access Network, RAN) and core network (Core Network, CN).Wherein Radio Access Network is for the treatment of all and wireless relevant function, and CN processes the functions such as customer location management in UMTS system, service management the exchange of realization and external network and routing function.CN is from being divided in logic circuit commutative field (Circuit Switched Domain, CS) and packet-switched domain (Packet Switched Domain, PS).UTRAN (Universal Terrestrial Radio Access Network Universal Terrestrial Radio Access Network), CN and subscriber equipment (User Equipment, UE) have formed whole UMTS system together.
In order to improve systematic function, the project of a System Architecture Evolution (System Architecture Evolution, SAE) is being carried out in the world at present.The framework of this system as shown in Figure 1.In Fig. 1, UE is subscriber equipment, i.e. terminal; EUTRAN is the wireless access network of evolution, wherein has the Node B of evolution, is called ENB, may also have other nodes, and we replace these nodes with ENB.MME (Mobility Management Entity) is Mobility Management Entity, has chain of command function, as with the chain of command Message Processing of UE, mobile management (recording UE positional information), paging, certification etc.Serving SAE Gateway, gateway, has user plane functions, transmits the data of UE, has S1-U interface with wireless access network.MME and gateway be similar traditional SGSN (Serving GPRS Support Node, Serving GPRS Support Node) altogether.PDN SAE Gateway, PDN (Packet Data Network, Packet Data Network) gateway, similar traditional GGSN (Gateway GPRS Support Node, gateway GPRS), there is SGi interface with outer data network, there is the function such as strategy execution, packet filtering.PCRF (Policy Control and Charging Rules Function) is policy control and charging regulation function entity, implementation strategy relevant control function.S3 interface is the interface between MME and the SGSN of 2G/3G, and it is based on GTP agreement, and S4 is the interface of gateway and SGSN.Gateway and PDN Gateway may also may be in different physical nodes in same physical node.MME and gateway may be also same physical node or the physical node that separates.When logic entity is above in same node, the interface signaling between it transfers internal node message to.
SAE/LTE is defined as a pure packet switching system, and this just shows that speech business can only be transmitted in the carrying of packet switch in this system.In SAE/LTE system, speech business data are generally controlled by IMS, so speech business is generally known as VoIP speech business in SAE/LTE.And for traditional speech business, be to be all generally carried on CS TDM (Time Division Multiplexing, time division multiplexing).SAE/LTE is that focus covers in the deployment of starting stage, and GSM/UMTS network can be regarded a kind of all standing to a certain extent as.
For different network carrying mechanism, the audio call of mobile communication can be divided into following a few class:
The first kind is the session service of CS territory carrying, as voice call;
Equations of The Second Kind is the session service of PS territory carrying, also referred to as VoIP class business, provides OoS to ensure, as the voice call of IP carrying by IMS.
For pure PS territory network, audio call can only transmit in its PS territory carrying, and IMS controls audio call by IP-based network.In 2G/3G network, audio call is to be all generally carried on CS territory.
The user who makes a call is in call process, likely cross over two networks, due to the difference of load-bearing of mobile telecommunication business mechanism, cause moving out SAE/LTE network base station institute coverage as UE, while entering the 2G/3G network base station area of coverage, may there is the interruption of IMS audio call, thereby affect the continuity that user speech is called out.
Summary of the invention
Embodiment of the present invention technical problem to be solved is, a kind of CS of being switched to network is provided, measures CS network, realizes the method and apparatus of CS business.Can realize voice conversation is switched to target CS network from IP network, keep the continuity of the audio call from IP network to CS network.
In order to solve the problems of the technologies described above, the embodiment of the present invention provides a kind of method of the CS of being switched to network, and the method comprises:
User is positioned at IP network, and described user is established to the logical channel between interconnection functional entity, and described user accesses described CS network by described interconnection functional entity;
Described user sets up CS voice conversation by described interconnection functional entity in described IP network;
Described IP network is triggered to described CS network to be switched, and described CS voice conversation is switched to CS network by described interconnection functional entity.
Accordingly, the embodiment of the present invention provides a kind of method of the CS of measurement network, and the method comprises:
Judge in the user of active state whether it is positioned at the borderline region of IP network and described CS network, if the judgment is Yes, described user's measurement target CS network; Otherwise described user does not measure target CS network.
Accordingly, the embodiment of the present invention provides a kind of method of the CS of realization supplementary service, and the method comprises:
User is positioned at IP network, sets up described user to the logical channel between interconnection functional entity, and described user is by described interconnection functional entity access CS network;
Described user is mutual based on described logical channel and described interconnection functional entity, realizes supplementary service by described interconnection functional entity at described CS network.
Accordingly, the embodiment of the present invention provides a kind of terminal equipment, and this terminal equipment comprises:
Registration support unit, for setting up logical channel with interconnection functional entity, with by described interconnection functional entity at described target CS network registry;
Switch unit, for completing after registration at described target CS network by described interconnection functional entity at described registration support unit, set up the CS voice conversation based on source network, and described terminal is switched to the CS voice conversation of described target CS network at the CS of described source network voice conversation.
Accordingly, the embodiment of the present invention provides a kind of method of the CS of being switched to network, comprising:
User is positioned at IP network, and described user carries out IMS voice conversation;
Described user enters the borderline region of described IP network and CS network, and described user is established to the logical channel between interconnection functional entity, and described user accesses described CS network by described interconnection functional entity;
Described user sets up CS voice conversation by described interconnection functional entity in described IP network;
Described IP network is triggered to described CS network to be switched, and described CS voice conversation is switched to CS network by described interconnection functional entity.
Accordingly, the embodiment of the present invention provides a kind of method of the CS of being switched to network, comprising:
IP network generation abnormal conditions, cannot continue to keep the IMS voice conversation in described IP network; Described IP network notifies described user that described IMS session is return back to CS network; Described user sets up CS voice conversation by described interconnection functional entity in described IP network; Described IP network is triggered to described CS network to be switched, and described CS voice conversation is switched to CS network by described interconnection functional entity.
Accordingly, the embodiment of the present invention provides a kind of method of the CS of being switched to network, comprising:
Described terminal is set up IMS session in IP network, and the signaling of described IMS session is successfully established, and the voice bearer of described IMS session is set up unsuccessfully; Described IP network is triggered to described IMS session and return back to CS network; Described user sets up CS voice conversation by described interconnection functional entity in described IP network; Described IP network is triggered to described CS network to be switched, and described CS voice conversation is switched to CS network by described interconnection functional entity.
Accordingly, the embodiment of the present invention provides a kind of method of the CS of returning back to network, comprising:
Described user accesses described CS network by described IP network; Described user sets up CS voice conversation by described interconnection functional entity in described IP network; Described in described user notification, IP network return back to CS network; User's measurement target network signal described in described IP network control, described UE sends measurement result to described IP network; Described IP network is triggered to described CS network to be switched, and described CS voice conversation is switched to CS network by described interconnection functional entity.
Accordingly, the embodiment of the present invention provides a kind of method of the CS of returning back to network, comprising:
User is positioned at IP network, and described user accesses described CS network by Gs-like interface; Described IP network base station system receives described user's paging request by described Gs-like interface; User's measurement target network signal described in described IP network control, described UE sends measurement result to described IP network; Described IP network is triggered to described CS network to be switched, and described CS voice conversation is switched to CS network by described interconnection functional entity.
Accordingly, the embodiment of the present invention provides a kind of user to trigger the method that return back to CS network, comprising:
User is positioned at IP network, and described user accesses described CS network by IP network; Described IP network notify described user its return back to CS network capabilities; Described user, according to self-ability and described IP network ability, notifies described IP network to initiate to return back to the process of CS network.
Accordingly, the embodiment of the present invention provides a kind of network-triggered to return back to the method for CS network, comprising:
User is positioned at IP network, and described user accesses described CS network by IP network; Described in described user notification IP network its return back to CS network capabilities; Described IP network, according to self-ability and described user network ability, notifies described user to initiate to return back to the process of CS network.
Accordingly, the method that the embodiment of the present invention provides the mono-receiver voice business continuity of a kind of SRVCC region to divide, comprising:
Reporting of user SRVCC ability; Be configured in the described IP network base station system in IP network and CS network boundary region, make to trigger the switching of described IP network to described CS network for the user who supports SRVCC ability.
Subscriber equipment in IP network in the embodiment of the present invention sends the signaling (for example registration, traffic signaling) of target CS network by interconnection functional entity, thereby simulate the behavior of described subscriber equipment at target CS network, realize voice conversation has been return back to target CS network from IP network, kept the continuity of the audio call from IP network to CS network.
Brief description of the drawings
Fig. 1 is a kind of embodiment schematic diagram of the system architecture of System Architecture Evolution network in the embodiment of the present invention;
Fig. 2 includes a kind of embodiment schematic diagram that interconnecting function is the network architecture of entity in the embodiment of the present invention;
Fig. 3 is UE example structure composition schematic diagram in Fig. 2 in the embodiment of the present invention;
Fig. 4 is the realization in the embodiment of the present invention is switched to the method for the continuous voice call of a CS network embodiment schematic flow sheet from IP network;
Fig. 5 is an embodiment schematic flow sheet of the method for user's measurement target CS network in Fig. 4 in the embodiment of the present invention;
Fig. 6 is an embodiment schematic flow sheet of a kind of method that realizes CS supplementary service in IP network in the embodiment of the present invention;
Fig. 7 be in the embodiment of the present invention when user is after CS network registry completes, initiate at SAE/LTE network the schematic flow sheet that the voice conversation from SAE/LTE IP network to target 2G/3G CS network after caller session switches;
Fig. 8 be in the embodiment of the present invention when user is after CS network registry completes, user's schematic flow sheet that the voice conversation of the voice conversation when called from SAE/LTE IP network to target 2G/3G CS network switches at SAE/LTE network;
Fig. 9 be in the embodiment of the present invention when user is during in SAE/LTE network, when UE receives the CS supplementary service request that network side initiates, an embodiment schematic flow sheet of the method for realize target 2G/3G CS Network;
Figure 10 be in the embodiment of the present invention when user is during in SAE/LTE network, when UE initiates CS supplementary service request, an embodiment schematic flow sheet of the method for realize target 2G/3G CS Network;
Figure 11 is that in the embodiment of the present invention, goal systems is 2G or 3G, realizes the flow chart from goal systems IMS territory audio call to origin system CS territory continuous voice call under the network architecture that system source is SAE/LTE;
Figure 12 is when UE occurs when abnormal, IMS voice conversation to be return back to 2G/3G CS flow through a network schematic diagram from SAE/LTE IP network in LTE network in the embodiment of the present invention;
Figure 13 is when UE IMS session in LTE network occurs when abnormal, IMS voice conversation to be return back to 2G/3G CS flow through a network schematic diagram from SAE/LTE IP network in the embodiment of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, the present invention is described in further detail.
Fig. 2 is the network architecture schematic diagram that one includes interconnection functional entity (Interworking Function, IWF).As shown in Figure 2, this network comprises source network, objective network and interconnection functional entity.In specific implementation, described source network can be GSM network, WCDMA network, LTE network, WIMAX network and 3GPP2 network etc.; Described objective network can be 3GPP2 DO network, 3GPP2 1XRTT network, UMB network, SAE/LTE network, WIMAX network etc.; In specific implementation, UE is established to the logical channel UP ' interface of IWF based on source network.UE passes through the signaling (for example registration, traffic signaling) that UP ' interface sends objective network, thereby simulation UE is in the behavior of objective network.
In specific implementation, UP ' interface can be based on source network IP bearing system, also signaling level message that can be based on source network is (for example, based on GSM USSD message, 2G/3G short message, 2G/3G/LTE NAS (None Access Stratum, non-access layer information) control message.
In specific implementation, IWF can be connected by Radius/Diameter and AAA (Autentication Authorization Accounting, authentication and authorization charging server) server.In the time that objective network is 3GPP2DO network, IWF contains 3GPP DO access side entity function, and the interface of IWF and PDSN is A10/A11, and IWF and PCF interface are A8/A9/ (A14)/(A20).In the time that objective network is 3GPP2 1XRTT network, IWF contains 3GPP2 1XRTT access side entity function, and the interface of IWF and 1XRTT MSC is A1.In the time that objective network is UMB network, IWF contains UMB network insertion side entity function, and IWF and AGW interface are U1, and IWF and SRNC interface are U2, and IWF and eBS interface are U1.In the time that objective network is SAE/LTE network, IWF contains SAE/LTE network insertion side eNodeB function, and IWF and MME interface are S1-MME, and IWF and Serving GW interface are S1-U.If IWF contains SGSN/MME functional entity, correspondingly, IWF and MME have S3/S10 interface.Or the interface between IWF and MME is S3 ', when switching from SAE/LTE network to 2G/3G network, all switching message are all passed through IWF, and IWF is always on the path of S3 interface.In the time switching from 2G/3G network to SAE/LTE network, all switching message are all passed through IWF, and IWF is always on the path of S3 interface.In the time that objective network is WIMAX network, IWF contains WIMAX network insertion side BS function, and IWF and ASN-GW interface are R4/R6.And, as the IWF of logical functional entity, can be carried on actual physical equipment (such as, on the equipment such as MSC/SGSN/MME/ASN-GW).In the time that objective network is 2G/3G CS network, IWF contains 2G/3G network insertion side BSC/RNC function, and IWF and MSC interface are A/Iu-CS.
The technical scheme of the embodiment of the present invention is IP network mainly for source network, and objective network is in the system of CS network, and voice conversation voice are return back to CS network from described IP network, realizes the problem of continuous voice call.
Fig. 3 is an example structure composition schematic diagram of UE in Fig. 2; As shown in Figure 3, the UE of the present embodiment comprises registration support unit 300, handover trigger unit 301 and switch unit 302, wherein,
Described registration support unit 300 is for setting up logical channel with interconnection functional entity, with by described interconnection functional entity at described target CS network registry; In specific implementation, UE is established to the logical channel UP ' interface of IWF based on origin system.UE passes through the signaling (for example registration, traffic signaling) that UP ' interface sends goal systems, thereby simulation UE is in the behavior of goal systems.In specific implementation, the IP bearing system that UP ' interface can be based on origin system, signaling level message (for example base LTE NAS control message) that also can be based on origin system.
Described handover trigger unit 301 is when initiating CS voice conversation or receive the CS voice conversation paging issuing from target CS network when this terminal equipment, described terminal equipment is measured described CS network, and measurement result is reported to described source network, switch to the CS voice conversation of described target CS network thereby trigger described source network.
Described switch unit 302 at described registration support unit by described interconnection functional entity after described target CS network completes registration and when described handover trigger unit 301 triggers described source network and switches to the CS voice conversation of described target CS network, set up the CS voice conversation based on source network, and described terminal is switched to the CS voice conversation of described target CS network at the CS of described source network voice conversation.
Accordingly, Fig. 4 is an embodiment schematic flow sheet of the realization of the present invention method that is switched to the continuous voice call of CS network from IP network; As shown in Figure 4, the method for the present embodiment comprises:
Step S100, user is positioned at IP network, described user is established to the logical channel between interconnection functional entity, described user is mutual based on described logical channel and described interconnection functional entity, by described interconnection functional entity at described CS network registry; In specific implementation, when UE is during in LTE network coverage, the LA (Location Area, the band of position) that UE can use eNodeB to send registers to CS territory by IWF, thereby ensure that UE is in the time of LTE network, still can receive or initiate CS and call out.Concrete, when UE is during in LTE network, the LA region that eNodeB sends can be equal to the LA at the 2G/3G of Same Physical position network for user.Because the LA of 2G/3G is made up of 2G/3G community, and Shi You LTE community, the LA region composition sending for eNodeB, so when UE is during in LTE network, the LA region of YouLTE community composition and the LA region being made up of 2G/3G CS network in same position region can not be completely overlapping.Or for LTE coverage, a new virtual LA region of YouLTE community composition, the LA region of this this virtual LA region and traditional 2G/3G network is separate.In general, in the time that UE quarters at LTE network, LA is configured in eNodeB above and sends to UE, UE by LTE network.If UE finds that LA changes, according to receiving LA by IWF executing location area update, and then complete the registration at CS network.
Step S101, described user sets up CS voice conversation by described interconnection functional entity in described IP network; In specific implementation, described user can set up CS voice conversation in described IP network in the following way, concrete, and described user initiates CS voice conversation by described logical channel and described interconnection functional entity in described IP network; Or described CS network sends audio call by described interconnection functional entity and described logical channel and seeks message to described user.
Step S102, described user's measurement target CS network, and measurement result is reported to described IP network;
Step S103, described IP network triggers described IP network according to described measurement result to be switched to described CS network, notifies described interconnection functional entity;
Step S104, described interconnection functional entity triggers and carries out the switching based on described CS network, and described CS voice conversation is switched to described CS network.
Accordingly, Fig. 5 is an embodiment schematic flow sheet of the method for user's measurement target CS network in Fig. 4; As shown in Figure 5, the method for user's measurement target CS network of the present embodiment comprises:
Step S1020, judges in the user of active state whether it is positioned at the borderline region of IP network and described CS network, if the judgment is Yes, performs step S1021; Otherwise, execution step S1022.
Step S1021, described user's measurement target CS network, then notifies described interconnection functional entity.
Step S1022, described user does not measure target CS network, then process ends.
Taking source network as SAE/LTE, objective network is that 2G network is that example describes, divide buffer area 1 and non-buffer area 2 for SAE/LTE network, in non-buffer area 2, if UE does not initiate audio call or does not receive audio call, UE is under active state, and UE can not initiate the cell measurement of 2G/3G.In buffer area 1, UE is under active state, and UE initiates the cell measurement of 2G/3G.
Particularly, the differentiation of buffer area 1 is as follows:
1) on the eNodeB of LTE-2G buffer area, configuration is specific indicates, and is sent to the UE in this region by eNodeB.In specific implementation, can send to UE by BSC broadcast channel, or for example, by RRC message informing terminal (Cell Update Confirm cell update acknowledge message, Handover to UTRAN Command is to the switching command of UTRAN, Physical Channel Reconfiguration physical channel reallocation message, Radio Bearer Reconfiguration radio bearer reallocation message, Radio Bearer Release radio bearer release message, Radio Bearer Setup radio bearer is set up message, RRC Connection Setup wireless link control connection is set up message, Transport Channel Reconfiguration transmission channel reallocation message, the message such as Measurement Control) etc. send corresponding indication information to terminal.
2) configure special 2G/3G Cell ID or LTE Cell ID in buffer area, in the time that UE enters buffer area, receive the adjacent LTE network information and comprise special 2G/3G Cell ID or LTE Cell ID (for example LTE cell list), thereby judge that it enters borderline region.
The discriminant approach of non-buffer area 2 is similar to the differentiation of buffer area 1.
In addition, if from only there being in logic two states, only need a kind of sign, if whether UE can judge in a kind of state, whether UE also just can judge UE for the second state.
Accordingly, the embodiment of the present invention also provides a kind of method that realizes CS supplementary service in IP network, and Fig. 6 is an embodiment schematic flow sheet of the method, and as shown in Figure 6, the method that realizes CS supplementary service in IP network of the present embodiment specifically comprises:
Step S200, user is positioned at IP network, sets up described user to the logical channel between interconnection functional entity, and described user is by described interconnection functional entity access CS network;
Step S201, described user is mutual based on described logical channel and described interconnection functional entity, realizes supplementary service by described interconnection functional entity at described CS network.
Taking source network as SAE/LTE network, objective network is that 2G/3G CS network is that example is elaborated to the embodiment of the present invention below, and wherein the logic interfacing between UE and IWF is based on NAS and S3 ' interface.
First, user in SAE/LTE network need to be at target 2G/3G CS network registry, in specific implementation, when UE is during in LTE network coverage, LA (the Location Area that UE can use eNodeB to send, the band of position) register to CS territory by IWF, thus ensure that UE is in the time of LTE network, still can receive or initiate CS and call out.Concrete, when UE is during in LTE network, the LA region that eNodeB sends can be equal to the LA at the 2G/3G of Same Physical position network for user.Because the LA of 2G/3G is made up of 2G/3G community, and Shi You LTE community, the LA region composition sending for eNodeB, so when UE is during in LTE network, the LA region of YouLTE community composition and the LA region being made up of 2G/3G CS network in same position region can not be completely overlapping.Or for LTE coverage, a new virtual LA region of YouLTE community composition, the LA region of this this virtual LA region and traditional 2G/3G network is separate.In general, in the time that UE quarters at LTE network, LA is configured in eNodeB above and sends to UE by LTE network, if UE finds that LA changes, according to receiving LA by IWF executing location area update, and then completes the registration at CS network.
Further, Fig. 7 is when user is after CS network registry completes, and initiates at SAE/LTE network the schematic flow sheet that the voice conversation from SAE/LTE IP network to target 2G/3G CS network after caller session switches.As shown in Figure 7,
At step S51, UE determines to initiate CS session, passes through UP ' interface and sends Setup message to IWF, and IWF is transmitted to VMSC (Visited Mobile Switch Center, Visited Mobile Switching Center).
At step S52 .VMSC sends IAM message GMSC, and GMSC returns to ACM to VMSC.
Receive after ACM message at step S53-S54VMSC, trigger RAB (Radio Access Bearer, wireless access is net loaded) appointment process.In specific implementation, in order not revise traditional MSC network, IWF needs user's face process of establishing of Simulation with I u-CS interface.Under certain particular case, upgrading MSC is MGW (Media Gateway media gateway), thereby IWF does not need user's face process of establishing of Simulation with I u-CS interface.
At step S55, UE initiates the measurement of 2G/3G adjacent cell, sends measurement report to eNB.In specific implementation, UE may be by the measurement result amendment about LTE in measurement report, thereby impels eNB to make to be switched to the judgement of 2G/3G.Or UE now only measures 2G/3G, or UE only reports the plan measurement result of 2G/3G in measurement report, or UE adds indicating bit in measurement report, and eNB makes 2G/3G switch decision according to this indicating bit.
At step S56, NB makes the judgement that is switched to 2G/3G, triggers LTE-> 2G/3G and switches.
At step S57, eNB sends to switch and requires to MME.
At step S58, MME generates handover request and sends to SGSN.Because IWF is in the path of S3 interface, allly all pass through IWF based on S3 message.
At step S59, after RAB has assigned, IWF continues to process LTE-> 2G/3G and switches.IWF sends CS handover request to MSC, triggers CS-CS (inter-BSC switches, or inter-MSC switching, if Target cell belongs to another one MSC service) handoff procedure.If notice that objective network is 2G network, MSC carries out the CS switching of 3G to 2G.If there is movable PS business, IWF forwards PS handover request to SGSN simultaneously.Now, IWF adopts similar 2G DTM (Dual Transfer Mode double-transmission mode) to switch or the next synchronous PS switching of 3G handover mechanism and CS handoff procedure.
At step S510, process and call out simultaneously in CS core net, if after objective network CS switches and be ready to complete, IWF receives switching command from MSC.Switch preparation if objective network completes PS, IWF also receives that from SGSN S3 interface forwards handoff response.
At step S511, when completing to switch, objective network prepares (PS+CS), and IWF regenerates the handoff response based on S3 interface and forwards this message to MME.
At step S512-S513, MME sends switching command to eNB, and eNB sends switching command to UE.
At step S514, UE carries out LTE to 2G/3G handoff procedure, access objective network system.
At step S515, if CONNECT message does not send to UE by LTE network, MSC sends CONNECT message to UE.
In specific implementation, step S51-S54 can carry out with step S55-S59 is concurrent.In general, in order to reduce the voice settling time of CS rollback, when UE sends after setup message, UE initiates the measurement of 2G/3G community at once, and sends measurement report to network.In addition, the RAB process of assigning can receive SETUP message or VMSC and receive for VMSC the ACM message of GMSC.
Accordingly, Fig. 8 is when user is after CS network registry completes, user's schematic flow sheet that the voice conversation of the voice conversation when called from SAE/LTE IP network to target 2G/3G CS network switches at SAE/LTE network.As shown in Figure 8,
At step S61-S63, in the time that UE is called as session, GMSC sends IAM message to VMSC, and VMSC sends beep-page message to IWF, and IWF passes through UP ' interface and sends beep-page message to user, triggers CS paging.
At step S64, VMSC sends Setup message to UE.
At step S65, UE sends Call Confirmed message to VMSC, and VMSC receives after CallConfirmed message, triggers RAB and assigns.In specific implementation, in order not revise traditional MSC network, IWF needs user's face process of establishing of Simulation with I u-CS interface.Under certain particular case, upgrading MSC/MGW (Media Gateway media gateway), thus IWF does not need user's face process of establishing of Simulation with I U-CS interface.
At step S66-S67, VMSC initiates RAN assignment messages to IWF, and IWF responds described RAN appointment.
At step S68, VMSC sends ACM message to GMSC.
At step S69, UE initiates the measurement of 2G/3G adjacent cell, sends measurement report to eNB.In specific implementation, UE may be by the measurement result amendment about LTE in measurement report, thereby impels eNB to make to be switched to the judgement of 2G/3G.Or UE now only measures 2G/3G, or UE only reports the plan measurement result of 2G/3G in measurement report, or UE adds indicating bit in measurement report, and eNB makes 2G/3G switch decision according to this indicating bit.
At step S610, eNB makes the judgement that is switched to 2G/3G, and eNB sends to switch and requires to MME.
At step S611, MME generates handover request and sends to SGSN.Because IWF is in the path of S3 interface, allly all pass through IWF based on S3 message.
At step S612, IWF sends CS handover request to MSC, triggers CS-CS (inter-BSC switches, or inter-MSC switching, if Target cell belongs to another one MSC service) handoff procedure.If notice that objective network is 2G network, MSC carries out the CS switching of 3G to 2G.If there is movable PS business, IWF forwards PS handover request to SGSN simultaneously.
Now, IWF adopts similar 2G DTM (Dual Transfer Mode double-transmission mode) to switch or the next synchronous PS switching of 3G handover mechanism and CS handoff procedure.
At step S613, process and call out simultaneously in CS core net, if after objective network CS switches and be ready to complete, IWF receives switching command from MSC.Switch preparation if objective network completes PS, IWF also receives that from SGSN S3 interface forwards handoff response.
At step S614, when completing to switch, objective network prepares (PS+CS), and IWF regenerates the handoff response based on S3 interface and forwards this message to MME.
At step S615-S616, MME sends switching command to eNB, and eNB sends switching command to UE.
At step S617, UE carries out LTE to 2G/3G handoff procedure, access objective network system.
At step S618, if. CONNECT message does not send to VMSC by LTE network, and UE sends CONNECT message to VMSC by 2G/3G network.
In specific implementation, step S61-S68 can carry out with step S69-S611 is concurrent.In general, in order to reduce the voice settling time of CS rollback, when UE receives after beep-page message, UE is triggered to the measurement of 2G/3G community, and sends measurement report to network.
Accordingly, in the time that UE is positioned at SAE/LTE network, UE passes through the CS supplementary service of UP ' interface and IWF realize target 2G/3G.Fig. 9 is when user is during in SAE/LTE network, when UE receives the CS supplementary service request that network side initiates, and an embodiment schematic flow sheet of the method for realize target 2G/3G CS Network; As shown in Figure 9,
At step S71, VMSC receives the service message that service center issues.
At step S72, VMSC sends corresponding service message to IWF, and IWF sends to UE by UP interface.
At step S73, UE passes through UP ' interface and sends corresponding service message and respond to IWF, and IWF sends corresponding service message and responds to VMSC.
At step S74, VMSC sends corresponding service response message to service center.
Figure 10 is when user is during in SAE/LTE network, when UE initiates CS supplementary service request, and an embodiment schematic flow sheet of the method for realize target 2G/3G CS Network; As shown in figure 10,
At step S81, when UE initiates CS supplementary service, UE passes through UP ' interface and sends corresponding business information to IWF.
At step S82, IWF sends corresponding service message to VMSC.
At step S83, service center sends service message response message to VMSC.
At step S84, VMSC sends service message response message to IWF, and IWF sends service message response message to UE.In specific implementation, above-mentioned CS supplementary service comprises SMS (Short Message Service Short Message Service), LCS (Location Service location-based service), US SD (Unstructured Supplementary Service Data unstructured supplementary data traffic) etc.For some CS supplementary service, S73-S74 or S83-S84 are option.
When SAE/LTE network design IMS network provides speech business, CS can the mechanism of moving back can apply the business relations problem of IMS territory speech business to CS speech business that solve equally.Figure 11 is that goal systems is 2G or 3G, realizes the idiographic flow schematic diagram of an embodiment of the method from goal systems IMS territory audio call to origin system CS territory continuous voice call under the network architecture that system source is SAE/LTE;
As shown in figure 11, the method for the present embodiment comprises:
Step S9, the SR-VCC preparatory stage: when UE has a movable IMS to call out and in SR-VCC territory, UE is in the SR-VCC preparatory stage.The SR-VCC territory here specifically can be LTE-2G borderline region, is similar to the He Fei buffer area, buffer area described in Fig. 5.Particularly, the SR-VCC preparatory stage is carried out following flow process:
At step S91, UE initiates voice conversation by SAE/LTE network, and this audio call is anchored at VCCAS.
At step S92, when UEA perception enters LTE and 2G borderline region, UE in the registration of CS territory, by NAS (NonAccess Stratum non-access layer information) transmits relevant 24.008 message, its process and method similar embodiment 1 between UE and IWF by IWF.
In specific implementation, UE can send CM Service Request (Confirm Mode Service Request, affirmation mode business request information) to MSC after registration afterwards, thus the negotiations process of the authentication of triggering following.The CM Service Request that now IWF buffer memory UE sends.When MSC does not receive Setup message for a long time, MM (the Mobility Management mobile management) timer expiry of MSC, thus MSC triggers abnormal flow process, when notice IWF discharges corresponding resource.If IWF still preserves the SR-VCC correlation behavior of UE, IWF resends CM Service Request message, or notice UE resends CMService Request message.Or for the UE of SR-VCC, UE, according to the configuration of self, periodically sends CM Service Request, thereby ensures that the MM state of MSC can be not overtime.
Step S10, territory transition region: when UE has a movable IMS to call out and in SR-VCC territory and LTE-> 2G/3G now occurs switch, UE is in territory transition region.Particularly, territory transition region is carried out following flow process:
At step S101-S103, LTE network eNodeB judgement, determines to trigger LTE-> 2G/3G switching flow.
At step S104-S105, IWF is receiving after handover request.Detect and need treatment S R-VCC (the mono-receiver voice continuity of Single Radio VCC), notify at once UP ' interface to send VCC and switch instruction to UE, UE triggers CS call flow, sends Setup (VDN).If do not carry out CM negotiations process in the SR-VCC preparatory stage, first UE initiates CM negotiations process.Particularly, IWF can be by checking that whether comprise voice bearer the handover request sending from MME judges between right and wrong and need to carry out SR-VCC process.
At step S106, RAB (Radio Access Bearer, RAB) appointment process.If in order to reduce service outage duration, IWF triggers voice dedicated bearer process of establishing by Rx interface, is used for interim transmitting audio data.
At step S107, IWF sends handover request to 2G/3G network, and judgement comprises IMS speech business and non-voice service, determines to trigger DTM and switches.Because IWF in S3 signaling paths, needs through IWF the synchronous whole flow process of IWF between SGSN and MME so PS switches message.
At step S108-S1010, trigger territory transfer process.At step S1011, DTF (Domain Transfer Function, territory modular converter) processing domain flow path switch.If in order to reduce service outage duration, VCCAS (VCC Application Server VCC application server) triggers bi-casting.
At step S1012, IWF receives switching command.At step S1013, IWF forwards handoff response to MME.
At step S1014-S1016, MSC sends corresponding switching command to UE, UE access target LTE network.
At step S1017, if Connect message does not send to UE by LTE network, MSC sends this message to UE by 2G/3G network.
Or in said process, first SR-VCC territory forms (or being only made up of direct and LTE community, 2G/3G region) by being close to LTE community, 2G/3G region.When UE enters behind this SR-VCC territory, UE in the registration of CS territory, by NAS (Non Access Stratum non-access layer information) transmits relevant 24.008 message, its process and method similar embodiment 1 between UE and IWF by IWF.Meanwhile, UE initiates CS session, passes through UP ' interface and sends Setup (VDN) message to IWF, and IWF is transmitted to VMSC (Visited Mobile Switch Center, Visited Mobile Switching Center), thereby triggers territory conversion process.Meanwhile, UE initiates the measurement of 2G/3G adjacent cell, sends measurement report to eNB, and eNB is triggered to LTE-> 2G/3G and switches and forward corresponding message to IWF.IWF is responsible for synchronous switching flow and CS call flow, thereby voice is switched to 2G/3G network from LTE network, the similar Fig. 7 of detailed process and Fig. 8.Or in said process, on the base station system eNB in LTE network SR-VCC territory, configure, when UE enters behind this region, need only the measurement report of UE transmission lower than certain threshold value, eNB instruction UE initiates CS session and triggers territory conversion process.Other steps and said process are similar.
For LTE-> 2G/3G SRVCC (Single Radio Voice Call Continuity, single receiver voice business continuity) the territory LA that can send by LTE network indicates, when UE receives LA at LTE network, think and enter LTE-> 2G/3G SRVCC territory.
For switching, on IWF entity, configure the LTE cell information in LTE-> 2G/3G SRVCC region from 2G/3G to LTE.When IWF receives after 2G/3G-> LTE switching, IWF checks whether the target LTE community in this handover request belongs to the LTE-> 2G/3G SRVCC region of target LTE network.If result is yes, do not trigger 2G/3G-> LTE SRVCC process, return to handoff failure to UE.If result is no, trigger 2G/3G-> LTE SRVCC process.In specific implementation, the LTE cell information in relevant LTE-> 2G/3G SRVCC region can be configured in DNS (Domain Name Server, name server) service, IWF can inquire about to search by DNS.Equally, the processing logic that the relevant LTE-> 2G/3G of Figure 11 switches between IWF is equally applicable to 2G/3G-> LTE SRVCC.
The LA that can send by LTE network for LTE-> 2G/3G SRVCC territory indicates, and, when UE receives LA at LTE network, thinks and enters LTE-> 2G/3G SRVCC territory.
If support Gs-like interface between MME and MSC entity, UE registers in CS territory by GS-like interface or IWF.The GS-like is here similar to the Gs interface in 2G/3G network.
When user by Gs-like interface after CS network registry completes, user's schematic flow sheet that the voice conversation of the voice conversation when called from SAE/LTE IP network to target 2G/3G CS network switches at SAE/LTE network is similar to Fig. 7:
At step S51, UE determines to initiate CS session, passes through UP ' interface and sends Setup message to IWF, and IWF is transmitted to VMSC (Visited Mobile Switch Center, Visited Mobile Switching Center).
At step S52, VMSC sends IAM message GMSC, and GMSC returns to ACM to VMSC.
Receive after ACM message at step S53-S54VMSC, trigger RAB (Radio Access Bearer, wireless access is net loaded) appointment process.
At step S55, UE initiates the measurement of 2G/3G adjacent cell, sends measurement report to eNB.In specific implementation, in general, UE is before initiating measurement, and UE revises it and reports the wireless link situation of eNodeB, thereby impels eNodeB to send Measurement Control to UE, and notice UE measures 2G/3G wireless signal.
Or this UE of UE notice eNodeB need to return back to 2G/3G CS territory, triggers eNodeB and sends Measurement Control to UE, notice UE measures 2G/3G wireless signal.The measurement result that eNodeB reports according to UE, selects corresponding 2G/3G Target cell.In general, UE for example, by RRC message (CS Fallback Trigger) or other Radio link commands notice eNodeB.
In general, UE may be by the measurement result amendment about LTE in measurement report, thereby impels eNB to make to be switched to the judgement of 2G/3G.Or UE now only measures 2G/3G, or UE only reports the plan measurement result of 2G/3G in measurement report, or UE adds indicating bit in measurement report, and eNB makes 2G/3G switch decision according to this indicating bit.
At step S56, NB makes the judgement that is switched to 2G/3G, triggers LTE-> 2G/3G and switches.
At step S57, eNB sends to switch and requires to MME.
At step S58, MME generates handover request and sends to SGSN.Because IWF is in the path of S3 interface, allly all pass through IWF based on S3 message.
At step S59, after RAB has assigned, IWF continues to process LTE-> 2G/3G and switches.IWF sends CS handover request to MSC, triggers CS-CS (inter-BSC switches, or inter-MSC switching, if Target cell belongs to another one MSC service) handoff procedure.If notice that objective network is 2G network, MSC carries out the CS switching of 3G to 2G.If there is movable PS business, IWF forwards PS handover request to SGSN simultaneously.Now, IWF adopts similar 2G DTM (Dual Transfer Mode double-transmission mode) to switch or the next synchronous PS switching of 3G handover mechanism and CS handoff procedure.
At step S510, process and call out simultaneously in CS core net, if after objective network CS switches and be ready to complete, IWF receives switching command from MSC.Switch preparation if objective network completes PS, IWF also receives that from SGSN S3 interface forwards handoff response.
At step S511, when completing to switch, objective network prepares (PS+CS), and IWF regenerates the handoff response based on S3 interface and forwards this message to MME.
At step S512-S513, MME sends switching command to eNB, and eNB sends switching command to UE.
At step S514, UE carries out LTE to 2G/3G handoff procedure, access objective network system.
At step S515, if CONNECT message does not send to UE by LTE network, MSC sends CONNECT message to UE.
In specific implementation, step S51-S54 can carry out with step S55-S59 is concurrent.In general, in order to reduce the voice settling time of CS rollback, when UE sends after setup message, UE initiates the measurement of 2G/3G community at once, and sends measurement report to network.In addition, the RAB process of assigning can receive SETUP message or VMSC and receive for VMSC the ACM message of GMSC.
Accordingly, or when user by Gs-like interface IWF after CS network registry completes, its called flow and Fig. 8 are similar:
At step S61-S63, in the time that UE is called as session, GMSC sends IAM message to VMSC,
At step S62-S63, if UE registers in CS territory by IWF, VMSC sends beep-page message to IWF, and IWF passes through UP ' interface and sends beep-page message to user, triggers CS paging.
If UE is by Gs-like interface in the registration of CS territory, VMSC initiates CS paging by Gs-like interface and MME, and this process is similar to Gs interface paging in 2G/3G network.Send CS paging request when eNodeB receives MME, eNodeB sends this paging request and Measurement Control to UE.In addition, in some cases, eNodeB need to send message (for example CS Fallback Trigger message) notice UE and return back to CS network.
If network is supported IMS, CSoPS (CS over PS) and CS Fallback (CS fallback mechanism) simultaneously, eNodeB and UE consult, and eNodeB and UE determine whether to initiate CS Fallback process according to negotiation result.If eNodeB and UE determine to initiate CS Fallback process according to negotiation result, eNodeB sends Measurement Control to UE, and UE initiates CS Fallback process.In general, concrete negotiations process can have following two kinds of modes:
(1) eNodeB sends the request of negotiation to UE, and UE is in the corresponding result of corresponding response message the inside instruction.
(2) UE is receiving after eNodeB paging request message, and UE notice eNodeB carries out CS Fallback or CSoPS.
At step S64, VMSC sends Setup message to UE.
At step S65, UE sends Call Confirmed message to VMSC, and VMSC receives after CallConfirmed message, triggers RAB and assigns.In specific implementation, in order not revise traditional MSC network, IWF needs user's face process of establishing of Simulation with I u-CS interface.Under certain particular case, upgrading MSC/MGW (Media Gateway media gateway), thus IWF does not need user's face process of establishing of Simulation with I U-CS interface.
At step S66-S67, VMSC initiates RAN assignment messages to IWF, and IWF responds described RAN appointment.
At step S68, VMSC sends ACM message to GMSC.
At step S69, if UE registers in CS territory by Gs-like, UE initiates the measurement of 2G/3G adjacent cell according to Measurement Control, sends measurement report to eNB, and eNodeB makes LTE-> 2G/3G switch decision according to the measurement result reporting.
If UE is by IWF in the registration of CS territory, UE, before initiating measurement, revises it and reports the wireless link situation of eNodeB, thereby impels eNodeB to send Measurement Control to UE, and notice UE measures 2G/3G wireless signal.UE is the measurement result amendment about LTE in measurement report, thereby impels eNB to make to be switched to the judgement of 2G/3G.
Or this UE of UE notice eNodeB need to return back to 2G/3G CS territory, triggers eNodeB and sends Measurement Control to UE, notice UE measures 2G/3G wireless signal.The measurement result that eNodeB reports according to UE, selects corresponding 2G/3G Target cell.In general, UE for example, by RRC message (CS Fallback Trigger) or other Radio link commands notice eNodeB.
In general, UE reports its CS Fallback/CSoPS/SRVCC/IMS ability, eNodeB determines whether to initiate CS Fallback/CSoPS/SRVCC/IMS according to self network condition and aforementioned capabilities, and LTE network notifies UE network whether to support CSFallback/CSoPS/SRVCC/IMS in broadcast message or rrc message simultaneously.UE and eNodeB can, according to its SRVCC/IMS/CSoPS/CSFallback ability and network load ability, consult whether to initiate CS Fallback/SRVCC process.
Particularly, in the time that UE is called as IMS, eNodeB, according to the CS Fallback/CSoPS ability of UE and current network situation, determines whether to trigger CS Fallback/CSoPS process.(such as issuing CSFallback Trigger and Measurement Control to UE).
When UE is during as IMS/CS caller, whether UE can support SRVCC/CS Fallback/CSoPS/IMS ability to determine whether initiating CS Fallback/CSoPS/IMS according to network.
In the time that UE receives the called request of IMS/CS, UE determines whether to initiate Fallback/CSoPS/IMS according to network capabilities.
Carrying out IMS voice conversation when UE is current, if network generation abnormal conditions, the ability that eNodeB reports according to UE, initiates CS Fallback or CSoPS process, transfers in CS network at voice conversation current.
In addition, when UE receives after the instruction such as CS Fallback that eNodeB sends, whether UE has speech business (such as IMS business, CSoPS speech business, CS speech business etc.) according to current, thereby whether final decision initiates the processes such as corresponding CS Fallback.
Notice that this negotiations process is suitable for equally UE and registers by Gs-like interface, be also suitable for all embodiment of the present invention.
In general, UE may be by the measurement result amendment about LTE in measurement report, thereby impels eNB to make to be switched to the judgement of 2G/3G.Or UE now only measures 2G/3G, or UE only reports the plan measurement result of 2G/3G in measurement report, or UE adds indicating bit in measurement report, and eNB makes 2G/3G switch decision according to this indicating bit.
If network is supported CSoPS (CS over PS) and CS Fallback (CS fallback mechanism) simultaneously, eNodeB and UE consult, and eNodeB and UE determine whether to initiate CS Fallback process according to negotiation result.If eNodeB and UE determine to initiate CS Fallback process according to negotiation result, eNodeB sends Measurement Control to UE, and UE initiates CS Fallback process.
At step S610, eNB makes the judgement that is switched to 2G/3G, and eNB sends to switch and requires to MME.
At step S611, MME generates handover request and sends to SGSN.Because IWF is in the path of S3 interface, allly all pass through IWF based on S3 message.
At step S612, IWF sends CS handover request to MSC, triggers CS-CS (inter-BSC switches, or inter-MSC switching, if Target cell belongs to another one MSC service) handoff procedure.If notice that objective network is 2G network, MSC carries out the CS switching of 3G to 2G.If there is movable PS business, IWF forwards PS handover request to SGSN simultaneously.
Now, IWF adopts similar 2G DTM (Dual Transfer Mode double-transmission mode) to switch or the next synchronous PS switching of 3G handover mechanism and CS handoff procedure.
At step S613, process and call out simultaneously in CS core net, if after objective network CS switches and be ready to complete, IWF receives switching command from MSC.Switch preparation if objective network completes PS, IWF also receives that from SGSN S3 interface forwards handoff response.
At step S614, when completing to switch, objective network prepares (PS+CS), and IWF regenerates the handoff response based on S3 interface and forwards this message to MME.
At step S615-S616, MME sends switching command to eNB, and eNB sends switching command to UE.
At step S617, UE carries out LTE to 2G/3G handoff procedure, access objective network system.
At step S618, if. CONNECT message does not send to VMSC by LTE network, and UE sends CONNECT message to VMSC by 2G/3G network.
In specific implementation, step S61-S68 can carry out with step S69-S611 is concurrent.In general, in order to reduce the voice settling time of CS rollback, when UE receives after beep-page message, UE is triggered to the measurement of 2G/3G community, and sends measurement report to network.
Correspondingly, if UE registers in CS territory by Gs-like interface, VMSC is initiated to the paging request of the supplementary service of UE by Gs-like and MME.UE receives after this paging request, sends page response to VMSC by IWF, and VMSC sends corresponding service message to UE.
Plant described flow process for Figure 11, UE is stationed LTE community by inquiry dns server current UE and whether belongs to LTE-> 2G/3G SRVCC territory.Particularly, UE is for example, using current LTE location area information of living in (TA, LTE community ID etc.) as input inquiry DNS.UE can be registered to CS network by Gs-like interface simultaneously.
Especially, the SRVCC for LTE to 1xRTT, also can be by SRVCC Area region is set, and UE shifts to an earlier date at 1xRTT network registry by LTE network in region, thereby save the time delay of SRVCC process.
Or, in the time that UE has a movable IMS session, the SRVCC ability that the eNodeB of LTE-2G/3G borderline region reports according to UE determines whether to turn down corresponding threshold values, thereby trigger eNodeB and issue Measurement Control (this order notice UE measures 2G/3G signal), thereby more easily triggering LTE-> 2G/3G switches, for the SRVCC UE in borderline region (or SRVCC region) and current existence activity IMS voice conversation, the ability that eNodeB reports according to it, the threshold values of relevant handoff parameter is turned down in active.Like this, be compared to other UE, described SRVCC UE more easily switch LTE-> 2G/3G switch, thereby ensure whole SRVCC switching flow success rate.
UE passes through LTE network at CS network registry, UE is current a movable IMS session, for example, because UE moves the PS HO handoff failure (LTE-LTE PS HO failure, LTE-HSPA HO failure etc.) causing, or because current network load causes abnormal, thereby cause voice quality variation or call drop, at this moment can be by CS Fallback mechanism by current I MS session rollback road CS network, specifically as shown in figure 12:
At step S121, when UE is at LTE network registry, UE passes through LTE network at CS network registry simultaneously.
At step S122-S125, when above-mentioned abnormal conditions occur, need to start CS Fallback process and return back to 2G/3G CS network.ENodeB perception abnormal conditions occur, and eNodeB notice UE initiates CS Fallback process.Or UE receives after the switch failure information of eNodeB, thus triggering UE and eNodeB negotiations process, thus initiate CS Fallback rollback flow process.Its idiographic flow is similar to Fig. 7, Fig. 8.
Step S126-S1221 and above-mentioned Fig. 7, Fig. 8 and Figure 11 are similar.
When UE is at LTE network registry, UE passes through LTE network at CS network registry simultaneously;
(1) UE initiates audio call by IMS, but due to current LTE network load or IMS Network Abnormal etc. problem, cannot initiate audio call by IMS network.
(2) or UE at IMS network when called, because UE network load of living in or IMS Network Abnormal etc. problem causes called flow failure.
In the time that above-mentioned abnormal conditions occur, IMS voice conversation need to be return back to 2G/3G CS flow through a network from SAE/LTE IP network, specifically as shown in figure 13:
At step S131, when UE is at LTE network registry, UE passes through LTE network at CS network registry simultaneously.
At step S132, for called and caller voice failure, the failure of eNodeB notice UE audio call, eNodeB and UE consult to trigger CS Fallback.Now, eNodeB has following mode to process carrying to set up failure procedures:
(1) this voice bearer of eNodeB notice MME is successfully established, thereby is successfully established by PCC notifications AF (Application Server) carrying, thereby sets up IMS voice conversation signaling channel.Now UE does following processing:
1) for the situation of caller failure, UE is until receive that switching command just sends ACK (acknowledge message) to IMS network.Now VCC AS can give called broadcasting verbal announcement.
2), for called failed situation, UE is until receive that switching command just sends 200OK message to IMS network.Now VCC AS can give called broadcasting verbal announcement.
(2) or eNodeB enable CS Fallback by PCC notifications AF, thereby notice VCCAS/DTF starts CS Fallback, processes thereby VCC AS is special CS Fallback.In general, VCC AS can play verbal announcement to user.
At step S133-S135, when eNodeB occurs extremely, eNodeB notice UE initiates CS Fallback process, or UE receives after the switch failure information of eNodeB, thereby triggers UE and eNodeB negotiations process, thereby initiates CS Fallback rollback flow process.Its idiographic flow is similar to Fig. 7, Fig. 8.
Step S136-S1321 and above-mentioned Fig. 7, Fig. 8 and Figure 11 are similar.
In addition, for caller conversation failure, UE can be by the failure of SIP signaling sensing IMS audio call, if called number is SIP URI, UE searches the corresponding PSTN number of called number, calls out thereby continue to initiate CS.
In above-mentioned two kinds of abnormality processing situations, if objective network is supported PS, the carrying of the non-voice of described IMS session is transferred to objective network PS network, thereby realizes similar CSI function.Meanwhile, above-mentioned two kinds of abnormality processing are also applicable to other Network Abnormal processing.
Subscriber equipment in IP network in the embodiment of the present invention sends the signaling (for example registration, traffic signaling) of target CS network by interconnection functional entity, thereby simulate the behavior of described subscriber equipment at target CS network, realize voice conversation has been return back to target CS network from IP network, kept the continuity of the audio call from IP network to CS network.Above-described embodiment is taking source network as SAE/LTE, and objective network is that 2G/3G CS network is that embodiment illustrates.Wherein taking the interface between UE and IWF based on NAS and S3 ' interface as example.
In addition, it is WIMAX network, 2G/3G network, 3GPP2HRPD network, 3GPP2 UMB network and 3GPP21XRTT network that above-described embodiment is equally applicable to origin system, and goal systems is WIMAX network, 3GPP2 HRPD network, 2G/3G network, 3GPP2 UMB network and 3GPP2 1XRTT network.Also be applicable to UP ' interface based on IP or RRC message.Above-described embodiment is applicable to CSoPS system too, and LTE network provides speech business by CSoPS, now still can realize the processing such as abnormality processing and load sharing by IWF.For LTE network, if the MME of service UE changes, (TA lane place changes, trigger TA renewal process), UE initiates LAU renewal, to upgrade the S3 ' interface between MME and IWF, set up S3 ' interface between new MME and IWF, delete the S3 ' interface between original MME and IWF.When UE is during in LTE network attachment, MME informs UE at attaching process by CSFallback ability simultaneously, and whether UE supports CS Fallback according to MME, thereby determines whether to initiate CS registration process.
Above disclosed is only preferred embodiment of the present invention, certainly can not limit with this interest field of the present invention, and the equivalent variations of therefore doing according to the claims in the present invention, still belongs to the scope that the present invention is contained.
Claims (6)
1. a method that is switched to CS network, is characterized in that, comprising:
User is positioned at IP network, and described user is established to the logical channel between interconnection functional entity, and described user accesses described CS network by described interconnection functional entity;
Described user initiates CS voice conversation to set up CS voice conversation by described logical channel and described interconnection functional entity in described IP network, or, described CS network by described interconnection functional entity and described logical channel send audio call seek message to described user to set up CS voice conversation;
In the time that described user sets up CS voice conversation, described user's measurement target CS network, and measurement result is reported to described IP network;
Described IP network triggers described IP network according to described measurement result to be switched to described CS network, notifies described interconnection functional entity;
Described interconnection functional entity triggers and carries out the switching based on described CS network, and described CS voice conversation is switched to described CS network.
2. the method that is switched to CS network as claimed in claim 1, it is characterized in that, described user is positioned at described IP network, and described user is established to the logical channel between interconnection functional entity, and the step that described user accesses described CS network by described interconnection functional entity comprises:
Described user is mutual based on described logical channel and described interconnection functional entity, by described interconnection functional entity at described CS network registry.
3. the method that is switched to CS network as claimed in claim 1, is characterized in that, the step that described user sets up CS voice conversation by described interconnection functional entity in described IP network comprises:
Described user initiates CS voice conversation by described logical channel and described interconnection functional entity in described IP network;
Or described CS network sends audio call by described interconnection functional entity and described logical channel and seeks message to described user.
4. a terminal equipment, is characterized in that, comprising:
Registration support unit, for setting up logical channel with interconnection functional entity, with by described interconnection functional entity at target CS network registry;
Switch unit, for completing after registration at described target CS network by described interconnection functional entity at described registration support unit, set up the CS voice conversation based on source network, user initiates CS voice conversation to set up CS voice conversation by described logical channel and described interconnection functional entity at described source network, or, described target CS network by described interconnection functional entity and described logical channel send audio call seek message to described user to set up CS voice conversation, and described terminal is switched to the CS voice conversation of described target CS network at the CS of described source network voice conversation,
Handover trigger unit, be used in the time that this terminal equipment is initiated CS voice conversation or received the CS voice conversation paging issuing from target CS network, described terminal equipment is measured described CS network, and measurement result is reported to described source network, switch to the CS voice conversation of described target CS network thereby trigger described source network.
5. terminal equipment as claimed in claim 4, is characterized in that, also comprises:
Perception unit, for being positioned at source IP network when described terminal, and receive target CS network of network identification information or receive when being used to indicate described user and entering the indication information of borderline region of described source network and described objective network, judge that described terminal use enters the borderline region of described source network and described objective network, and receive network identification information or indication information described in by the domain identifier information updating of storage being.
6. the terminal equipment as described in claim 4 or 5, it is characterized in that, the described support unit of registering is as non-access layer information support unit, for setting up non-access layer information logical channel with interconnection functional entity, with by described interconnection functional entity at described target CS network registry.
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| US8165608B2 (en) * | 2009-09-30 | 2012-04-24 | Alcatel Lucent | Apparatus and method for reducing LTE-to-1XRTT border cell cross-paging in circuit switched fall back call delivery |
| US9730261B2 (en) | 2010-01-18 | 2017-08-08 | Telefonaktiebolaget Lm Ericsson (Publ) | Hierarchical protocol classification |
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| CN102202359B (en) * | 2010-03-22 | 2014-08-06 | 中国移动通信集团公司 | Control method and apparatus thereof for handover of 2G network, and base station controller |
| CN102209370B (en) * | 2010-03-31 | 2015-09-02 | 重庆重邮信科通信技术有限公司 | LTE multimode terminal has issued the method for circuit domain voice call at LTE access module |
| CN102833807B (en) * | 2011-06-14 | 2015-05-27 | 华为技术有限公司 | Method and device for suspending packet data service |
| ES2610824T3 (en) * | 2012-07-13 | 2017-05-03 | Huawei Technologies Co., Ltd. | Method, device and system for transferring to a circuit switching domain |
| CN102946473B (en) * | 2012-10-26 | 2014-10-01 | 北京小米科技有限责任公司 | Communication method and equipment for asynchronous communication mode |
| US9100877B2 (en) * | 2013-02-01 | 2015-08-04 | Intel Deutschland Gmbh | Communication devices and methods for controlling a communication device |
| CN104010318B (en) * | 2013-02-22 | 2018-05-11 | 华为技术有限公司 | The method and apparatus of transmission services |
| CN105025542A (en) * | 2014-04-18 | 2015-11-04 | 中兴通讯股份有限公司 | Method for returning to long-term evolution cell and terminal |
| JP2017519452A (en) | 2014-06-24 | 2017-07-13 | 華為技術有限公司Ｈｕａｗｅｉ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｃｏ．，Ｌｔｄ． | Voice resource saving method, device and system |
| US10004004B2 (en) | 2014-07-15 | 2018-06-19 | T-Mobile Usa, Inc. | Telecommunication equipment measuring pre-establishment service interruptions |
| CN105814934B (en) * | 2014-11-19 | 2019-03-26 | 华为技术有限公司 | Handle method, mobile management entity and the home subscriber server of called service |
| CN107615816B (en) * | 2015-04-30 | 2020-12-22 | 宇龙计算机通信科技(深圳)有限公司 | Switching method, switching system and terminal between CS domain and PS domain |
| CN105897462A (en) * | 2016-03-25 | 2016-08-24 | 宇龙计算机通信科技(深圳)有限公司 | Data transmission processing method and apparatus, and terminal |
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| CN107969018B (en) * | 2016-10-20 | 2021-08-17 | 中兴通讯股份有限公司 | Voice service switching method and device |
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| CN102325355A (en) | 2012-01-18 |
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