CN101472313B - Method, equipment and system for switching voice business - Google Patents
Method, equipment and system for switching voice business Download PDFInfo
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- CN101472313B CN101472313B CN2008101466728A CN200810146672A CN101472313B CN 101472313 B CN101472313 B CN 101472313B CN 2008101466728 A CN2008101466728 A CN 2008101466728A CN 200810146672 A CN200810146672 A CN 200810146672A CN 101472313 B CN101472313 B CN 101472313B
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Abstract
The invention discloses a method for switching voice service, which is used for switching the voice service loaded on a SAE/LTE network to CS domain of a 2G/3G network. The method comprises the following steps; voice service loaded on the SAE/LTE network is established by UE; eMSC receives registration information sent out by the UE, so as to carry out CS domain registration; eMSC switches the voice data transmission path at a remote terminal to eMSC; and eMSC switches the voice data transmission path of the UE to the CS domain of 2G/3G network. By sharing eMSC node, the invention ensures that the cost of additional VCC node disposition in a network in which eMSC and VCC coexist is saved; and the time of voice interruption is less than 300 ms during switching process, thereby improving service quality of voice communication service.
Description
Technical field
The present invention relates to the mobile communication technology field, particularly relate to a kind of speech business changing method, system and device.
Background technology
At Wimax (Worldwide Interoperability for Microwave Access, micro-wave access global inter communication) the data rate index of system uplink 50M, descending 100M such as, in order to guarantee the competitiveness of 10 years wireless technologys from now on, 3GPP (third generation partner plan) normal structure has been released new generation network evolution items SAE (System Architecture Evolution, the 3GPP System Architecture Evolution)/LTE (LongTerm Evolution, Long Term Evolution) network evolution.SAE/LTE network evolution items is based on HSDPA (High Speed Downlink Packages Access, high speed downlink packet inserts) thinking of the optimization of network performance that come down in a continuous line since the technology, at original HSDPA and EUL (Enhanced Uplink, enhanced uplink) etc. on the system-based to postponing, the user data digit rate, power system capacity/covering, the carrying out of four aspects such as cost further optimized.
As shown in Figure 1, be the network architecture diagram of SAE/LTE evolution system in the prior art.Wherein, the Access Network part E-UTRAN of SAE/LTE evolution system (Evolved UMTS Territorial RadioAccess Network, the UMTS Terrestrial radio access network of evolution) forms by base station ENB (eNodeB), bottom adopts the IP transmission between the ENB, logically is connected to each other by X2 interface.Such network configuration design is mainly used in and supports the mobility of UE in whole network, guarantees user's seamless switching.ENB is responsible for (the User Equipment to UE, subscriber equipment) provides the user-plane function of evolution wave point, as PDCP (packet data convergence protocol), RLC (Radio Link Control, Radio Link control), MAC (Radio Resource Control, and the control plane function radio resource control) and PHY (Physical-Layer, physical layer),, as RRC (Radio ResourceControl, radio resource control).Evolution core net EPC links to each other with ENB by the S1 interface; The S1 interface is supported ENB and MME (Mobility Management Entity, mobile management entity)/ multi-to-multi between SAE GATEWAY (3GPP System Architecture Evolution gateway) connects, so the core net of evolution system part is made up of MME and SAE GATEWAY two parts.MME is the control plane node of evolution system core net, bears the management function of UE context and user plane carrying; SAE Gateway is the user plane node of evolution system core net, bears user data transport function.
The 2G/3G network is through for many years deployment, can regard a kind of comprehensive covering to a certain extent as, along with the SAE/LTE development of internet technology, the SAE/LTE network-covered is to some cities and traffic hot zones, cause in present communication network, SAE/LTE network and 2G/3G network are also deposited.
At different network carrying mechanism, the speech business of mobile communication can be divided into following several classes:
The first kind is the session service of CS territory carrying, as voice call;
Second class is the session service of PS territory carrying, is also referred to as VoIP class business, provides OoS to guarantee by IMS, as the voice call of IP carrying.
The SAE/LTE network is as the packet switching system of a kind of PS territory carrying, and speech business can only be transmitted in its packet domain carrying, and IMS controls speech business by IP-based network.In the 2G/3G network, speech business generally all is to be carried on the CS territory.
The user who makes a call is in the call process, might cross over two networks, because the difference of load-bearing of mobile telecommunication business mechanism, cause moving out SAE/LTE network base station institute coverage as UE, when entering the 2G/3G network base station area of coverage, the interruption of IMS speech business may occur, thereby influence the continuity of user speech business.
In order to address the above problem, guarantee the continuity of user speech business, adopt eMSC technical scheme or SRVCC technical scheme to solve IMS speech business that is carried on the SAE/LTE network and the continuity problem that is carried on speech business between the CS territory at present.
The eMSC technical scheme is the node eMSC with MSC function of user's face increase at SAE/LTE, and the speech business of SAE/LTE carrying is controlled by eMSC.This is equivalent to increase the CS territory at user's face of SAE/LTE.When 2G/3G CS switched, eMSC connected MME and has the function of MME, receives the switching message from MME in speech business; Simultaneously, eMSC is connected function with MSC and the switching that can finish PS territory and CS territory switching message as gateway with the MSC of 2G/3G.
The SRVCC technical scheme is by the other wireless links of simulation, provides two wireless access links to the UE that only has single Radio Link access, finishes the switching of SAE/LTE PS territory speech business to 2G/3G CS territory according to the VCC standard procedure.Among the TR23.882, in the scheme of 8 kinds of SRVCC, 5 kinds are adopted new node of increase to connect SAE/LTE and 2G/3G CS as gateway, thereby simulate an other wireless access links.
According to the demand that operators such as T-Mobile propose, these two kinds of technical schemes may and be stored in the network of operator, and operator is to adopt eMSC scheme or SRVCC scheme according to self strategy and user signing contract information decision speech business switching in the future.
Existingly carry out SAE/LTE PS territory speech business and comprise following scheme to the method for the switching in 2G/3G CS territory:
One, Combinational VCC scheme
Combinational VCC scheme will be switched with VCC territory conversion and combine, and at first speech business be switched to 2G/3G PS territory from SAE/LTE PS territory, and then carry out the territory conversion of VCC.
This scheme requires purpose network support PS to switch, and has the voice bearer ability in PS territory and CS territory simultaneously.Current most 2G GSM network can not satisfy above-mentioned requirements.
Two, standard SRVCC scheme
A class SRVCC scheme other among the TR23.882 comprises 5 kinds of implementations, they all provide being connected of SAE/LTE and 2G/3G CS territory by a gateway node that increases newly, thereby the wireless access links of UE2G/3G CS is given in simulation, is used to solve the problem that single Radio Link inserts SAE/LTE and 2G/3GCS territory simultaneously.。These 5 kinds of schemes are respectively:
-D-1, Inter-MSC handover with archoring at the VCC AS promptly is anchored on the inter-MSC handover scheme of VCCAS
-D-2, LTE-VMSC anchor solution, i.e. LTE-VMSC grappling scheme
-E, IMS anchored voice continuity, i.e. IMS grappling scheme
-F-1，F-2，Inter-MSC?handover?with?IMS?centralized?service
The identical CS-Proxy that is called of nodename that D-1, D-2 introduce, but function difference.Its function of CS-Proxy among the D-1 is an anchor MSC, is connected to target MSC by E interface, does not have direct interface with MME, does not also exist alternately with MME, and UE will transmit by VCC AS alternately by SAE/LTE access network and CS-Proxy.Though the CS-Proxy among the D-2 also is an anchor MSC, and is connected to target MSC by E interface, also have PS is switched the gateway function that message transformation becomes CS switching message, there is mutual interface with MME.The IWF of E scheme has the function of similar SGSN with regard to MME, be a GERAN BSS or UTRAN RNS for target MSC.The nodename that F-1, F-2 introduce all is PCHCF, also has different functions.The function of PCHCF presents the PS switching behavior to SAE/LTE among the F-1, presents the CS handoff functionality to the target CS territory, promptly has the function of MME/SGSN and MSC.The function that the function of PCHCF promptly comprises LTE Access Network and 2G/3G Access Network among the F-2 also comprises the function of MSC server, also needs to possess the function of SIP User Agent simultaneously.Although the function of this newly-increased node is not quite similar, their common ground be exactly by it as gateway, UE can be connected to 2G/3G CS network by single Radio Link of SAE/LTE.
With 5 kinds of above-mentioned schemes directly with the eMSC plan implementation at same carrier network because eMSC has possessed the function of the newly-increased node of above-mentioned segmentation scheme, the node deployment simultaneously of function repetition can cause waste.
Summary of the invention
The problem that the embodiment of the invention will solve provides a kind of speech business changing method, can coexist as in the network of same operator at eMSC and VCC scheme, guarantees that on the one hand eMSC scheme itself can finish the function of former scheme; On the other hand, can share eMSC, its gateway as SAE/LTE connection 2G/3G CS territory is responsible for the conversion of PS territory and CS territory switching message, and the CS signaling that is provided to UE connects the territory conversion of finishing VCC, substitute the gateway node that increases in the SRVCC scheme, thereby reach the minimizing cost, and guarantee the voice interruption time, the effect of the service quality of raising voice communication service less than 300ms.
For achieving the above object, the embodiment of the invention proposes a kind of speech business changing method on the one hand, and the speech business that is used for being carried on the SAE/LTE network switches to the CS territory of 2G/3G network, may further comprise the steps:
EMSC receives the log-on message that UE sends, and carries out the registration of CS territory, and wherein this UE sets up the speech business that is carried on the SAE/LTE network;
Described eMSC switches to described eMSC with the voice data transmission path of far-end;
Described eMSC switches to the voice data transmission path of described UE in the CS territory of 2G/3G network.
On the other hand, the embodiment of the invention also provides a kind of speech business switched system, and the speech business that is used for being carried on the SAE/LTE network switches to the CS territory of 2G/3G network, comprises eMSC:
Described eMSC is used to receive the CS registration of UE, and wherein said UE is used for connecting described eMSC by the SAE/LTE network, and carries out the CS registration to described eMSC, sends the log-on message of the port numbers that comprises the current media flow transmission to described eMSC; And
Be used for writing down the described port numbers of described log-on message, and the voice data transmission path of far-end is switched to described eMSC, the voice data transmission path of described UE is switched to the CS territory of 2G/3G network.
On the one hand, the embodiment of the invention also provides a kind of eMSC, comprising again:
Described CS Registering modules is used to receive the CS registration of described UE;
Described SAE/LTE network handover module is used for the voice data transmission path of far-end is switched to described eMSC;
Described 2G/3G network handover module is used for the voice data transmission path of described UE is switched to the CS territory of 2G/3G network.
The technical scheme of the embodiment of the invention has the following advantages, because adopt the method for sharing the eMSC node, so avoided the waste that the extra VCC of deployment causes in the network of eMSC and VCC coexistence, provide cost savings, and can guarantee that the handoff procedure voice interruption is no more than 300ms, has improved the service quality of voice communication service.
Description of drawings
Fig. 1 is the structural representation of SAE/LTE network in the prior art;
Fig. 2 is a non-roaming system architecture of sharing eMSC in the embodiment of the invention based on eMSC plan V CC;
Fig. 3 is a roaming system framework of sharing eMSC in the embodiment of the invention based on eMSC plan V CC;
Fig. 4 carries out the schematic flow sheet of 2G/3G CS registration to eMSC for UE in the embodiment of the invention one;
Fig. 5 is for carrying out the first that switch in the CS territory to the 2G network in the embodiment of the invention two;
Fig. 6 is for carrying out the second portion that switch in the CS territory to the 2G network in the embodiment of the invention two;
Fig. 7 is for carrying out the first that switch in the CS territory to 3G network in the embodiment of the invention three;
Fig. 8 is for carrying out the second portion that switch in the CS territory to 3G network in the embodiment of the invention three;
Fig. 9 is the structural representation of 41 kinds of speech business switched systems of the embodiment of the invention.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail:
The embodiment of the invention has proposed a kind of speech business changing method, concrete application foundation is: guaranteeing that eMSC scheme self can independently finish under the prerequisite of the function that former scheme provides, share the eMSC node in the existing eMSC scheme, make it can be connected to 2G/3G CS territory, be responsible for the conversion that message is switched in PS territory and CS territory, the 2G/3G CS signaling that is provided to UE connects, and replaces the gateway node that increases in the SRVCC scheme.
Based on the eMSC scheme, system architecture non-roaming and that roam under two kinds of situations is distinguished as shown in Figures 2 and 3.Wherein, CSCF has represented IM CN Subsystem.Because VCC AS also belongs to the part of IMCN Subsystem, for the sake of clarity, represent the IM CN Subsystem can the interface of each node among VCC AS and the IM CN Subsystem is clear and definite with CSCF.
Thin thread part is divided into the framework of former eMSC among Fig. 2 and Fig. 3, and thick line is the framework that the VCC scheme is connected with eMSC partly, is that this programme constitutes the part that the SRVCC scheme increases for sharing eMSC on the framework of eMSC scheme.
As shown in Figure 4, be the embodiment of the invention one 2G/3G CS register flow path figure.In order when switch taking place, eMSC Media Stream to be switched to the source end, i.e. SAE/LTE, media bearer, the whole process Media Stream that guarantees VCC does not interrupt, UE needs the transport layer port number of notice eMSC current media stream, i.e. the TCP/UDP port numbers when carrying out the CS registration to eMSC.UE registers to eMSC by SAE/LTE.UE is to the user face of eMSC registration by SAE/LTE, and promptly the CS signaling is by the IP carrying of user's face.
S401, UE set up the voice communication service that is carried on SAE/LTE.Set up the voice data transmission path between UE and the PDN GW.
S402, UE carry out the CS registration to eMSC.Registration message in registration process comprises the port numbers of current media flow transmission, and the port numbers that is used for media flow transmission comprises the port numbers of receiving and dispatching media data, also may comprise port numbers that is used for media data current control/report condition etc.
The registration of CS occurs in after the speech business foundation, can finish before switching to 2G/3G CS territory, also can carry out when generation is switched in 2G/3G CS territory.In order to reduce handover delay, the registration of CS should be finished before switching to 2G/3G CS territory after speech business is set up.
The foregoing description is based on the eMSC technical scheme, guarantees that at first eMSC scheme self can independently finish the function that former scheme provides.On this basis, share the eMSC node, make it can be connected to 2G/3G CS territory.
As shown in Figure 5 and Figure 6, be the embodiment of the invention two, the speech business that is carried on SAE/LTE is carried out the schematic flow sheet that switch in the CS territory to the 2G network.
Different with the handoff procedure of standard, because such switching comprises the territory handoff procedure of VCC, in order to reduce time delay for switching, the part flow process can walk abreast and carry out.Also have, in order to reduce the break period of Media Stream, there be twice switching of Media Stream in whole handoff procedure.Owing to there is parallel flow process, for describe clear for the purpose of, whole handoff procedure separated into two parts is described.First is the preparatory stage of switching flow, finishes the distribution of purpose 2G CS territory resource, as shown in Figure 5.Second portion is the implementation phase of comprising the switching of VCC territory handoff procedure, as shown in Figure 6.The territory handoff procedure of VCC is finished the switching of signaling and Media Stream, and then carries out the switching of wireless access, is at last to switch speech data to flow to 2G CS territory, satisfies the switching requirement that 300ms interrupts to guarantee the voice interruption time.Concrete switching flow comprises step:
S501, UE send measurement report to eNB, and eNB starts according to the switch decision conditional decision and switches to 2G CS territory.
S502, eNB send Relocation required message to MME, and indication is switched and Target cell to 2G CS territory.
S503, MME select eMSC and send Forward relocation required message to it.
The information of S504, foundation configuration, eMSC determines purpose MSC and sends MAP Preparehandover request message to it.
S505～S508, be the inter-MSC switching flow part of standard, this stage is finished the foundation of CS resource between distribution, purpose MSC and the eMSC of purpose BSSCS resource, also has eMSC to the distribution of the transmitting audio data resource of PDNGW and the foundation in path.
S502～S508 is parallel among step S601～S609 and Fig. 5 among Fig. 6 carries out, and the signaling of UE to eMSC is by the user plane bearer of SAE/LTE, adopt with former eMSC scheme in identical CS signaling bear.This part flow process that relates to is followed the VCC flow process of standard.
S509, eMSC are after step S609 and step S508c finish, ask the MGW of self to be connected to user's face and speech data is forwarded to PDN GW, the port numbers of notice eMSC and the IP address setting of UE when wherein register according to UE the purpose transport address of speech data.The speech data of follow-up arrival is forwarded to PDN GW by the carrying to UE of former SAE/LTE, if step S508c finished before step S609, can not produce voice interruption.This point can be provided with step S603 by eMSC and guarantee after step S508c.
By the application of this step, eMSC replaces the SAE/LTE network to receive the speech data that far-end UE sends, and the speech data of being received is transmitted to PDN GW, finished present embodiment the first time voice data transmission path switching.
S510, eMSC send Forward relocation response to source MME, and the destination resource all assigns, and the path also has been configured and has finished.
S511, source MME send Relocation command to source eNB, start the execution phase of switching.
S512, source eNB send switching command Handover from E-UTRAN command to UE.
S513, UE be according to the content of Handoverfrom E-UTRAN command, and wireless access is switched to the sub-district of purpose BSS, sends Handover access message to purpose BSS.
S514, purpose BSS send Handover detect to purpose MSC.
S515, purpose MSC send message MAP Process access signal request to eMSC, and eMSC determines that according to this message UE successfully has been linked into destination, asks its MGW that the path of speech data is switched to purpose MSC.EMSC is released into the resource and the path of PDN GW transmitting audio data then, and the notification source end discharges resource.
Application by this step, UE is inserted 2G CS territory, and replace PDN GW to carry out phonetic data with purpose BSS and purpose MSC, thereby will and far-end UE between the voice data communication path switch to 2G CS territory by the SAE/LTE network fully, finished present embodiment the second time voice data transmission path switching.
S516, UE send Handover from E-UTRAN complete to purpose BSS.This step and step S514, step S515 do not have the constraint of precedence.
S517, purpose BSS send message Handover complete to purpose MSC.This step and S515 do not have the constraint of precedence.
S518, purpose MSC send MAP Send end signal request to eMSC, and eMSC notification source end discharges resource in view of the above.
In above embodiment, eMSC has control phase MGW and carries out the function that twice audio data stream switches, i.e. step S509 and step S515a, and guarantee that with this voice interruption time satisfies the requirement that voice interruption when switching is no more than 300ms.Improved the service quality of user speech communication service.
As shown in Figure 7 and Figure 8, be carried on the switching in CS territory is carried out in flow chart from the speech business of SAE/LTE to 3G network for the embodiment of the invention three.Present embodiment is employed message and the UE process when the Target Wireless system inserts in embodiment two differences.These difference do not influence the committed step of switching, and as finishing of preparatory stage, speech data switches to the path of PDN GW from the MGW of eMSC, and speech data switches to the path of purpose MSC from the MGW of eMSC.Fig. 7 is that the speech business that is carried on SAE/LTE is carried out the first that switch in the CS territory to 3G network, is the preparatory stage of switching flow, finishes the CS territory resource allocation of purpose 3G network; Fig. 8 is carried on the second portion of the speech business of SAE/LTE to 3G CS flow chart, is the implementation phase of comprising the switching of VCC territory handoff procedure.Specifically may further comprise the steps:
S701, UE send measurement report to eNB, and eNB starts according to the switch decision conditional decision and switches to 3G CS territory.
S702, eNB send Relocation required message to MME, and indication is switched and Target cell to 3G CS territory.
S703, MME select eMSC and send Forward relocation required message to it.
The information of S704, foundation configuration, eMSC determines purpose MSC and sends MAP Preparehandover request message to it.
S705～S708 is the inter-MSC switching flow part of standard, and this stage is finished the foundation of CS resource between distribution, purpose MSC and the eMSC of purpose BSSCS resource, also has eMSC to the distribution of the transmitting audio data resource of PDNGW and the foundation in path.
S702～S708 is parallel among step S801 among Fig. 8～S809 and Fig. 7 carries out, and the signaling of UE to eMSC is because the user plane bearer of SAE/LTE, adopt with former eMSC scheme in identical CS signaling bear.This part flow process that relates to is followed the VCC flow process of standard.
S709, eMSC are after step S809 and step S708c finish, ask the MGW of self to be connected to user's face and speech data is forwarded to PDN GW, the port numbers of notice eMSC and the IP address setting of UE when wherein register according to UE the purpose transport address of speech data.The speech data of follow-up arrival is forwarded to PDN GW by the carrying to UE of former SAE/LTE, if step S708c finished before step S809, can not produce voice interruption.This point can be provided with step S803 by eMSC and guarantee after step S708c.
By the application of this step, eMSC replaces the SAE/LTE network to receive the speech data that far-end UE sends, and the speech data of being received is transmitted to PDN GW, finished present embodiment the first time voice data transmission path switching.
S710, eMSC send Forward relocation response to source MME, and the destination resource all assigns, and the path also has been configured and has finished.
S711, source MME send Relocation command to source eNB, start the execution phase of switching.
S712, source eNB send switching command Handoverfrom E-UTRAN command to UE.
S713, purpose RNS detect UE and are linked into its sub-district transmission Relocation detect to purpose MSC.
S714, purpose MSC send message MAP Process access signal request to eMSC, and eMSC determines that according to this message UE successfully has been linked into destination, asks its MGW that the path of speech data is switched to purpose MSC.EMSC is released into the resource and the path of PDN GW transmitting audio data then, and the notification source end discharges resource.
Application by this step, UE is inserted 3G CS territory, and replace PDN GW to carry out phonetic data with purpose RNS and purpose MSC, thereby will and far-end UE between the voice data communication path switch to 3G CS territory by the SAE/LTE network fully, finished present embodiment the second time voice data transmission path switching.
S715, UE send Handoverfrom E-UTRAN complete to purpose BSS.This step and step S714 do not have the constraint of precedence.
S716, purpose BSS send message Relocation complete to purpose MSC.
S717, purpose MSC send MAP Send end signal request to eMSC, and eMSC notification source end discharges resource in view of the above.
In above embodiment, eMSC has control phase MGW and carries out the function that twice audio data stream switches, i.e. step S709 and step S715a, and guarantee that with this voice interruption time satisfies the requirement that voice interruption when switching is no more than 300ms.Improved the service quality of user speech communication service.
As shown in Figure 9, be the embodiment of the invention four, a kind of speech business switched system is provided, the speech business that is used for being carried on the SAE/LTE network switches to the CS territory of 2G/3G network, comprising:
UE1 is used to connect far-end UE3 and sets up the speech business that is carried on the SAE/LTE network, and is connected eMSC2, and carries out CS to eMSC2 and register;
EMSC2 is used to receive the CS registration of UE1, and the speech business that will be carried on the SAE/LTE network switches to the CS territory of 2G/3G network;
Far-end UE3 is used to connect UE1 and sets up the speech business that is carried on the SAE/LTE network, and is connected eMSC2.
Wherein, eMSC2 comprises:
SAE/LTE network handover module 22 is used for the voice data transmission path of far-end UE3 is switched to eMSC2;
2G/3G network handover module 23 is used for the voice data transmission path of UE1 is switched to the CS territory of 2G/3G network.
Wherein, SAE/LTE network handover module 22 comprises:
UE resource allocation submodule 221 is used to UE1 to distribute CS territory resource;
Far-end UE path switching submodule 222 is used for the voice transfer path of far-end UE3 is switched to eMSC2 by the SAE/LTE network.
Wherein, 2G/3G network handover module 23 comprises:
UE path switching submodule 231 is used for the voice data transmission path of UE1 is switched to purpose BSS;
EMSC path switching submodule 232 is used for the voice transfer path of eMSC2 is switched to purpose MSC.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (11)
1. speech business changing method, the speech business that is used for being carried on System Architecture Evolution SAE/ Long Term Evolution LTE network switches to the circuit domain CS territory of second generation mobile communication technology 2G/ 3G (Third Generation) Moblie technology 3G network, it is characterized in that, may further comprise the steps:
The eMSC of mobile switching centre of evolution receives the log-on message that user equipment (UE) sends, and carries out the registration of CS territory, and wherein said UE sets up the speech business that is carried on the SAE/LTE network;
Described eMSC switches to described eMSC with the voice data transmission path of far-end;
Described eMSC switches to the voice data transmission path of described UE in the CS territory of 2G/3G network.
2. speech business changing method as claimed in claim 1 is characterized in that, the log-on message that described UE sends comprises the port numbers of current media flow transmission.
3. speech business changing method as claimed in claim 1 is characterized in that, the voice data transmission path of described far-end also comprises before switching to described eMSC:
Described eMSC is that described UE carries out the resource allocation in CS territory at purpose 2G/3G network, and to far-end transmit path handoff request.
4. speech business changing method as claimed in claim 1 is characterized in that, the voice data transmission path of described far-end switches to described eMSC and is specially:
Described eMSC request is connected to user interface;
Described eMSC receives the speech data that described far-end sends;
The voice data transmission that the described far-end that described eMSC will receive sends is to grouped data network gateway PDN GW;
Described PDN GW sends to described UE with described speech data by described SAE/LTE network.
5. speech business changing method as claimed in claim 1 is characterized in that, described eMSC switches to 2G/3G network C S territory with the voice data transmission path of described UE by described eMSC and may further comprise the steps:
Described eMSC sends described 2G/3G network C S territory to described UE and switches message, switches described UE to described 2G/3G network C S territory;
After described eMSC received the path switch acknowledgment message that described UE returns, the voice data transmission path of switching described UE was to purpose MSC.
6. as claim 4 or 5 described speech business changing methods, it is characterized in that, twice switching in the voice data transmission path of the voice data transmission path of described far-end and the voice data transmission path of described UE and described UE finished by described eMSC, realizes described eMSC sharing in described twice handover scheme.
7. speech business switched system, the speech business that is used for being carried on the SAE/LTE network switches to the CS territory of 2G/3G network, it is characterized in that, comprises eMSC:
Described eMSC, be used to receive the CS registration of UE, wherein said UE sets up the speech business that is carried on the SAE/LTE network, is used for connecting described eMSC by the SAE/LTE network, and carry out CS to described eMSC and register, send the log-on message of the port numbers that comprises the current media flow transmission to described eMSC; And
Be used for writing down the described port numbers of described log-on message, and the voice data transmission path of far-end is switched to described eMSC, the voice data transmission path of described UE is switched to the CS territory of 2G/3G network.
8. eMSC, the speech business that is used for being carried on System Architecture Evolution SAE/ Long Term Evolution LTE network switches to the circuit domain CS territory of second generation mobile communication technology 2G/ 3G (Third Generation) Moblie technology 3G network, it is characterized in that, comprise CS Registering modules, SAE/LTE network handover module and 2G/3G network handover module:
Described CS Registering modules is used to receive the CS registration of UE, and described UE sets up the speech business that is carried on the SAE/LTE network;
Described SAE/LTE network handover module is used for the voice data transmission path of far-end is switched to described eMSC;
Described 2G/3G network handover module is used for the voice data transmission path of described UE is switched to the CS territory of 2G/3G network.
9. eMSC as claimed in claim 8 is characterized in that, described SAE/LTE network handover module comprises UE resource allocation submodule and far end path switching submodule:
Described UE resource allocation submodule is used to UE to distribute CS territory resource;
Described far end path switching submodule is used for the voice data transmission path of described far-end is switched to described eMSC by the SAE/LTE network.
10. eMSC as claimed in claim 8 is characterized in that, described 2G/3G network handover module comprises UE path switching submodule and eMSC path switching submodule:
Described UE path switching submodule is used for the voice data transmission path of described UE is switched to purpose BSS;
Described eMSC path switching submodule is used for the voice data transmission path of described eMSC is switched to purpose MSC.
11. eMSC as claimed in claim 8, it is characterized in that, coexist as in the network of same operator, realize the function of described eMSC scheme by described eMSC at eMSC and voice business continuity technology VCC scheme, simultaneously, by sharing the function that described eMSC realizes described VCC scheme.
Priority Applications (1)
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| CN105722163A (en) * | 2016-02-24 | 2016-06-29 | 中国联合网络通信集团有限公司 | Network switching method and system |
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| CN102104848B (en) * | 2009-12-16 | 2014-08-06 | 中国移动通信集团公司 | Dual-mode single-standby voice service continuity realization method and Internet protocol (IP) multimedia subsystem |
| CN102572788B (en) * | 2010-12-30 | 2014-10-08 | 中国移动通信集团公司 | Inter-communication system (ICS) and communication method and communication device based on same |
| WO2014067143A1 (en) * | 2012-11-02 | 2014-05-08 | 华为技术有限公司 | Method, device and system for switching to circuit switch domain |
| CN107251609B (en) * | 2015-05-15 | 2019-12-17 | 华为技术有限公司 | VoLTE service implementation method, system and equipment |
| CN109257779A (en) | 2017-07-14 | 2019-01-22 | 华为技术有限公司 | Method for switching network and device |
| CN109257788B (en) * | 2017-07-14 | 2021-06-22 | 华为技术有限公司 | Network switching method and device |
| WO2019061414A1 (en) * | 2017-09-30 | 2019-04-04 | Oppo广东移动通信有限公司 | Service path switching method, device, storage medium and system |
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| CN105722163B (en) * | 2016-02-24 | 2019-08-13 | 中国联合网络通信集团有限公司 | Method for switching network and system |
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