CN100571441C - Changing method between the wireless system of evolution and traditional wireless system - Google Patents
Changing method between the wireless system of evolution and traditional wireless system Download PDFInfo
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Abstract
LTE in a kind of mobile communication system and the changing method between Pre-LTE when LTE and Pre-LTE switching, are that the LTE system is dressed up a Pre-LTE system, make SGSN think that ongoing switching is a SRNS repositioning process in the process of switching.When LTE switches to Pre-LTE, the function of the new-SGSN of the similar SGSN of the effect of SGSN in switching in SRNS reorientation flow process, MME has then served as the function of old-SGSN; When Pre-LTE switches to LTE, SGSN is similar to the old-SGSN in the SRNS reorientation flow process in switching, and MME has then served as the function of new-SGSN.MME carries out the conversion of new-old system signaling and contextual information, has the function of similar SGW.Changing method between LTE of the present invention and Pre-LTE need not the existing system of upgrading, and handover delay is little, and loss of data can drop to minimum.
Description
Technical field
The present invention relates in the mobile communication system a kind of changing method from the wireless system LTE of evolution to traditional wireless system Pre-LTE.
Background technology
The framework of SAE (System Architecture Evolution, system evolved framework) system sees also Fig. 1, and core net comprises the SGSN in SAE EPC (Evolved Packet Core) and the GPRS core net; The connecting system that SAE EPC is connected to is Evolved RAN (Radio Access Network), is called LTE again, and the connecting system that SGSN is connected to is UTRAN/GERAN, is commonly referred to as Pre-LTE.LET broadly represents a kind of technology of Long Term Evolution, is as a kind of " wireless system of evolution " in this article, and Pre-LTE is as a kind of " traditional wireless system ".
Each network element is defined as follows among the figure:
SGSN (Serving GPRS supporting node, the GPRS service node): 2G/3G network packet domain-functionalities entity, be responsible for mobile management, session management, forwarding user data package, storage UE contextual information, produce temporary mark and it is distributed to UE, and be responsible for the user is carried out authentication etc.;
MME (Mobility Management Entity, the mobile management node): the chain of command functional entity, be in charge of and store the UE context (such as the UE/ user ID, mobility management states, user security parameters etc.), produce temporary mark and it is distributed to UE, when UE quarters at this tracing area or this network is to be responsible for this user is carried out authentication;
AGW (Access GateWay, IAD), by functional entity UPE, 3GPP Anchor and SAE Anchor form, and each functional entity is described below:
UPE (User Plane Entity, user face nodes): the user plane functions entity, the user face data route is handled, termination is in the downlink data of the UE of idle state, when the downlink data that mails to UE arrives, initiate paging, the context of management and storage UE, this context comprise such as the parameter of IP bearer service or network internal routing iinformation etc.Wherein 2G/3G UPE refers to be the UPE of 2G/3G network service, and 2G/3G UPE also is SGSN+GGSN; SAE UPE is the UPE in the SAE network.
3GPP Anchor: user's face anchor point is the data entrance of territory, border B.Be responsible for the mobile management of B inside, territory, border, and be the borde gateway of territory, border B, be responsible for user data is forwarded to different UPE in the B of territory, border.
SAE Anchor, the mobile management anchor point between multiple connecting system, this anchor point are the user plane functions entities of supporting the mobile management between the multiple connecting system of 3GPP inside and 3GPP and non-3GPP definition.SAE Anchor has the function of mobile IP home agent.
3GPP organizes the Organization Chart of only having determined the LTE/SAE system at present, for the present just research focus of the switching of LTE and Pre-LTE.When the design changing method, need consider following principle:
1) the smaller the better to the change of existing system (referring to SGSN here);
2) can satisfy data does not have and loses;
3) handover delay is the smaller the better;
The LTE/SAE system supports the back to switching, and just supports to be ready to Radio Resource earlier in objective network, does wireless switching again.The benefit of doing like this is to reduce handover delay as much as possible, reduces packet loss.Such switching is called the back to switching.
SRNS reorientation flow process in the existing gprs system is to handoff procedure after one.Fig. 2 is the flow process of a SRNS reorientation in the existing UMTS system (TS23.090 V7.1.0).The SRNS reorientation step that defines among Fig. 2 is described below:
201, the Source-RNC decision needs to carry out the SRNS reorientation.At this moment, the upstream and downstream user data are through the tunnel between following tunnel transmission: MS (travelling carriage) and Source-SRNC; GTP-U tunnel between Source-SRNC and old-SGSN; GTP-U tunnel between old-SGSN and GGSN;
202, Source-SRNC sends " re-positioning request " message and gives old-SGSN.This message has comprised security information, RRC context-sensitive information (comprising the MS ability) and other switching information needed;
203, old-SGSN determines according to purpose RNC whether this reorientation is at SGSN inside or SGSN-spanning.If SGSN-spanning, old-SGSN sends " forwarding re-positioning request " to new-SGSN.Comprise IMSI, endpoint of a tunnel information, mobility management states (MM) context, PDP Context and other relevant informations of sending from Source-SRNC in this message, as RAB information;
204, New-SGSN sends " forwarding re-positioning request " message and gives target-RNC (Target RNC).Set up Iu between New-SGSN and Target-RNC and be connected, and be that UE reserves Radio Resource;
205, after the resource reservation between Target-RNC and New-SGSN success, and SGSN is when being ready to the SRNS reorientation, and New-SGSN sends " forwarding relocation response " message to Old-SGSN.Have Target-RNC in this message and prepare to accept to transmit the tunnel id information that data are used.This message represents that Targe-RNC has been ready to accept from Source-SRNC the downlink data unit of forwarding;
206, Old-SGSN sends " reorientation order " message to Source-RNC, and the tunnel information with step 205 transfer hair in this message sends to Source-RNC;
207, Source-SRNC begins to Target-RNC converting downlink data according to QoS;
208, Source-SRNC needed the data flow of transmission according to the order of sequence to those before transmission RRC message is to UE, should hang up through the up-downgoing data transmission of Source-SRNC.RRC message informing UE reconfigures radio channel in the purpose system.The physical channel configuration information of in this RRC message Target-RNC being sent sends to UE, to quicken switching flow.The physical channel reconfiguration information has comprised ID and the S-RNTI of UE in Target-RNC of Target-RNC.Reshuffle when UE finishes, it sends RRC message to Target-RNC, notifies its physical channel to reshuffle and finishes;
209, Source-SRNC sends " transmitting the SRNS context " message by old-SGSN and new-SGSN to target-RNC.Target-RNC sends " transmitting the SRNS context response " message and gives Source-SRNC after receiving this message.Contain next up PDCP sequence number, next descending PDCP sequence number, next uplink and downlink GTP sequence number in the Source-RNC context;
210, when receiving, Target-RNC should send " reorientation discovery " message after triggering is carried out in reorientation to New-SGSN.The indication that triggers from the lower-layer protocols of RNC is carried out in reorientation;
211, Target-RNC receives suitable RRC message, such as, the physical channel is reshuffled and is finished, and Target-RNC sends that " reorientation finishes that " message is given New-SGSN;
212, after receiving " reorientation is finished " message, if the SRNS reorientation is a SGSN-spanning, New-SGSN sends " transmitting the SRNS reorientation finishes " message to Old-SGSN;
213, after receiving " reorientation is finished " message, upgrade PDP Context between New-SGSN and GGSN, the tunnel from GGSN to Old-SGSN is switched to from GGSN to New-SGSN;
214, after receiving " transmitting the SRNS reorientation finishes ", Old-SGSN sends the Iu release command message to Source-RNC.Behind the data forwarding timer expiry among the Source-RNC, Source-RNC sends the Iu Release complete to Old-SGSN;
215, if change has taken place in the route district, UE initiates the Routing Area Update flow process.
C1-C3 among Fig. 2 is the relevant CAMEL flow process of intelligent network, and is irrelevant with the present invention, here repeats no more.
Changing method of the present invention requires after the support of Pre-LTE system to switching.The GERAN of A/Gb pattern does not support the back to switching, and the present invention does not consider.The GERAN of UTRAN and Iu pattern (GSM EDGE Radio Access Network) all supports the back to switching, and therefore, the GERAN and the switching between LTE of UTRAN or Iu pattern can be adopted the method for the invention, but go back the feasible implementation of neither one at present.
Summary of the invention
The technical problem to be solved in the present invention is to propose LTE in a kind of mobile communication system and the changing method between Pre-LTE, need not the existing system of upgrading, and handover delay is little, and loss of data can drop to minimum.
In order to reduce the influence to existing SGSN as much as possible, the present invention is that the LTE system is dressed up a Pre-LTE system when LTE and Pre-LTE switching, makes SGSN think that ongoing switching is a SRNS repositioning process in the process of switching.Therefore, when when LTE switches to Pre-LTE, the function of the new-SGSN of the similar SGSN of the effect of SGSN in switching in SRNS reorientation flow process, MME has then served as the function of old-SGSN; When Pre-LTE switches to LTE, SGSN is similar to the old-SGSN in the SRNS reorientation flow process in switching, and MME has then served as the function of new-SGSN.MME carries out the conversion of new-old system signaling and contextual information, has the function of similar SGW.
Based on above design, the invention provides the method that switches to traditional wireless system Pre-LTE in a kind of mobile communication system from the wireless system LTE of evolution, may further comprise the steps:
(a) after the LTE decision is switched, send " handoff request " to mobile management node M ME, MME sends " forwarding re-positioning request " to the GPRS of objective network service node SGSN again;
(b) SGSN notice supports that the back is the mobile terminal UE distributing radio resource to the traditional wireless system PRE-LTE that switches, and sets up Iu according to RAB information with PRE-LTE and be connected, then to MME transmission " forwarding relocation response " message;
(c) MME sends " reorientation order " to access gateway AG W, if any the downstream data flow that need transmit according to the order of sequence, AGW stops to send this data flow to LTE, and beginning sends this data flow to SGSN, send the breakpoint information of this data flow simultaneously to MME, SGSN buffer memory downlink data;
(d) MME sends switching command to LTE, and described breakpoint information is sent to SGSN, and SGSN sends to PRE-LTE again, finishes SRNS context forwarding process;
(e) PRE-LTE and UE consult to set up radio bearer RB, and PRE-LTE sends " reorientation is finished " message to SGSN;
(f) carry out PDP Context between SGSN and the AGW and upgrade, set up user plane path, notify MME to be discharged into the user plane path of AGW and the Radio Resource of PRE-LTE simultaneously;
In the above step, MME also is used to finish the signaling format between the different agreement and the conversion of contextual information.
Based on above design, the present invention also provides the method that switches to the wireless system LTE of evolution in a kind of mobile communication system from traditional wireless system Pre-LTE, may further comprise the steps:
(A) after the Pre-LTE decision is switched, send " re-positioning request " to GPRS service node SGSN, SGSN sends " forwarding re-positioning request " message to mobile management node M ME;
(B) MME is by AGW notice LTE or directly to notify LTE be that UE distributes wireless channel, and the AGW notice is set up user plane path between LTE and AGW, and AGW begins to transmit to LTE needs the downlink data packet of transmission according to the order of sequence, sends downlink data to SGSN simultaneously;
(C) AGW sends " switching request response " to MME, carries the configuration information of wireless messages, is transmitted to mobile terminal UE by MME through SGSN, Pre-LTE, and Pre-LTE notice UE switches to new network, and announcement is the channel information of its distribution;
(D) Pre-LTE is transmitted to MME by SGSN with the SRNS context, and MME sends it to AGW again;
(E) after the configuration of the wireless channel between UE and the LTE was finished, LTE notice AGW switched to the data channel between AGW and SGSN between AGW and LTE, and AGW stops to send downlink data to SGSN;
(F) LTE notice MME switching is finished, and MME reinforms the lu interface resource between SGSN release and Pre-LTE, and switching is finished;
In the above step, MME also is used to finish the signaling format between the different agreement and the conversion of contextual information.
As can be seen, the present invention has provided the method for switching between a kind of LTE of solution and Pre-LTE, and this method can accomplish to need not to upgrade existing SGSN, and switching point is placed on after the purpose Internet resources are ready to, thereby loss of data is dropped to minimum, and reduced handover delay.
Description of drawings
Fig. 1 is the SAE system block diagram.
Fig. 2 is the SRNS reorientation flow chart among the TS23.060.
Fig. 3 is the building-block of logic that LTE and Pre-LTE switch.
Fig. 4 is first embodiment switches to the committed step of Pre-LTE from LTE a schematic diagram.
Fig. 5 is second embodiment switches to the committed step of LTE from Pre-LTE a schematic diagram.
Fig. 6 A and Fig. 6 B are respectively before first embodiment switches and the data path figure after switching.
Fig. 7 is the switching flow figure of first embodiment: switch to Pre-LTE from LTE.
Fig. 8 A and Fig. 8 B are respectively before second embodiment switches and the data path figure after switching.
Fig. 9 is the switching flow figure of second embodiment: switch to LTE from Pre-LTE.
Embodiment
The present invention is in order to realize the switching of LTE to Pre-LTE.SGSN in handoff procedure in the MME simulation SRNS repositioning process.When LTE switches to Pre-LTE, the old-SGSN in the MME simulation drawing 2; When Pre-LET switches to LTE, the new-SGSN in the MME simulation drawing 2.The gn interface that defines among the interface compatibility TS23.060 of MME and SGSN.AGW has then served as the role of GGSN.MME bears tasks such as the conversion, message conversion of data format between LTE and Pre-LTE.
The logical construction of switching between LTE and Pre-LTE as shown in Figure 3, wherein, the defined function, MME also has following functional module: with the SGSN message interface, this interface is according to the gn interface that defines among the TS23.060 in TR23.882v1.2.3; S1 interface with eNB; Interface with AGW; Data translation and information mapping module are responsible for the conversion of message format between each interface, the mapping of the mapping of message data cell, particularly QoS.ENB is " Node B of evolution ", is the network element of the wireless system LTE of evolution.The function of LTE is finished by this network element herein, may but do not get rid of other.
In order to support the transmission according to the order of sequence of no packet loss and data, AGW can send to downlink data LTE and Pre-LTE two paths simultaneously.The RAN of LTE and Pre-LTE (wireless access network) network element is not transmitted data, does not transmit data by SGSN, MME yet.AGW simultaneously should be able to write down breakpoint information, and to do breakpoint information mutual with MME.
MME and AGW defer to the direct-cut operation SRNS reorientation flow process that defines among the TS23.060 under the prerequisite that satisfies the above-mentioned functions requirement.
First embodiment
Present embodiment is the situation that switches to Pre-LTE as UE from LTE.The committed step of switching as shown in Figure 4.Before switching and the data path after switching respectively shown in Fig. 6 A and Fig. 6 B.The execution mode flow chart in order to simplify, becomes a node AGW with user's face nodal set among Fig. 7 as shown in Figure 7, but this embodiment still is suitable for when user plane unit is divided into different entities by logic function.Wherein:
Switching from LTE to Pre-LTE has following committed step, as shown in Figure 4:
Step 1, LTE send " handoff request " to MME;
Step 2, MME send " forwarding re-positioning request " message to SGSN;
Step 3, SGSN notice support that the RAN side of switching later (being Pre-LTE) is the UE distributing radio resource, and SGSN sets up Iu by the SRNS reorientation flow process among the TS23.090 with the RAN side and is connected;
Step 5, MME inquire breakpoint information to AGW;
Step 6, MME send " transmitting the SRNS context " message to SGSN, and the breakpoint information of AGW is sent to SGSN;
Step 7, MME send switching command to LTE, and UE switches to Pre-LTE;
Step 8, SGSN carry out PDP Context by the step among the TS23.090 to be upgraded.
Be noted that above step is not to describe in strict accordance with the sequencing that takes place, concrete operating sequence should be as the criterion with the description in the detailed process.
The detailed step that present embodiment switches is seen Fig. 7, is example to switch to UTRAN from LTE, and the GERAN that switches to the Iu pattern is similar, no longer repeats.May further comprise the steps as shown in the figure:
701, eNB switches according to the detected signal strength signal intensity decision of UE needs;
702, eNB sends handoff request to MME, comprises user profile (as PTMSI), objective network information (as objective network route district), RAB information etc. in this request;
703, MME finds corresponding SGSN according to the objective network information in 702, MME sends " forwarding re-positioning request " message to SGSN, this message has the MM context of UE and described RAB information etc., it be the MM context (comprising the conversion of safe context) of SGSN that MME needs the MM context switch with SAE, and is the RAB information that SGSN can discern with the RAB information translation that eNB sends;
704, SGSN sends " re-positioning request " message to UTRAN, has safe context, UE user profile, RAB information etc. in the message, obtains in the MM context of safe context from " forwarding re-positioning request " message;
705, UTRAN is connected according to setting up required Iu between RAB information and SGSN;
706, the switching of Iu mouth is ready to complete, and UTRAN successfully is that UTRAN sent " re-positioning request is replied " message to SGSN, and the wireless resource configuration of carrying UE after UE distributed the radio channel resource;
707, SGSN sends " transmitting re-positioning request replys " message to MME, and SGSN brings MME with the wireless resource configuration of " data forwarding tunnel ID " and UE in this message;
708, MME sends " reorientation order " message to AGW, and described " data forwarding tunnel ID " sent to AGW;
709, after AGW receives " reorientation order " message, those are needed data flow transmitted according to the order of sequence, AGW stops to send downlink data to eNB, AGW sends " reorientation command response " message to MME, those are needed data flow transmitted according to the order of sequence, and AGW sends to MME with " next up PDCP sequence number to be confirmed " and " next up GTP sequence number " in this message;
For not needing data flow transmitted according to the order of sequence, AGW can promptly send to eNB always in original path, finishes between AGW and the SGSN to switch on the new path after PDP Context upgrades in step 720 again.
710, MME sends " switching command " message to eNB, the wireless resource configuration of carrying UE, and notice eNB switches preparation to be finished, can begin wireless mouthful and switch, and eNB sends to UE with the wireless resource configuration of UE again;
711, after AGW receives " reorientation order " message, stop to send downlink data packet, and begin downlink data is transmitted to SGSN SGSN buffer memory downlink data to eNB;
712, MME sequence number that AGW is sent converts the SRNS context format to, and sends " transmitting the SRNS context " message to SGSN, has " SRNS context " in this message;
713, after SGSN receives " transmitting the SRNS context " message, send " transmitting the SRNS context " message, the SRNS context is sent to UTRAN to UTRAN;
714, after UTRAN receives " transmitting the SRNS context " message, preserve the SRNS contextual information, and send " transmitting the SRNS context response " message to SGSN;
715, SGSN sends " transmitting the SRNS context response " message to MME, and SRNS context forwarding process finishes;
716, UTRAN consults to set up radio bearer RB according to RAB information and UE in " re-positioning request " message in SRNS context in " transmitting the SRNS context " message and the step 704, UE and UTRAN exchange up-downgoing PDCP sequence number, both sides all can continue to send the up-downgoing packet from breakpoint;
717, UTRAN sends " reorientation is finished " message to SGSN, and data link successful switch arrives the new route through SGSN from UTRAN;
718, SGSN sends " transmitting reorientation finishes " message to MME, and notice MME switching is finished, and the LTE/SAE resource can discharge;
719, SGSN sends " PDP Context renewal " message to AGW, sets up the user plane path from SGSN to AGW;
720, AGW sends " PDP Context upgrades response " to SGSN, and the user plane path from SGSN to AGW is set up and finished;
721, MME sends " release of S1 interface " message to eNB, and notice eNB discharges Radio Resource, and is discharged into the user plane path of AGW;
722, eNB discharges wireless mouthful of resource, discharges the S1 interface resource, sends " the S1 interface discharges response " message to MME;
723, MME sends " transmit reorientation and finish response " to SGSN;
724, the executing location district upgrades between UE and MME.
The sequencing of above step also not exclusively is equal to the sequencing that incident in the step takes place, and has some parallel incidents in handoff procedure, knows clearly logical relation that this can be between step and the diagram.The following examples also are the same.
Be noted that, if the current business that does not have need to transmit according to the order of sequence of UE, then can omit in handoff procedure in the above-mentioned flow process and " SRNS context " relevant step, AGW can not comprise " next up PDCP sequence number to be confirmed " and " next up GTP sequence number " to " reorientation order " message that MME sends yet in step 709.
Second embodiment
Present embodiment is the situation that switches to LTE as UE from Pre-LTE.The committed step of switching as shown in Figure 5.Before switching and the data path after switching respectively shown in Fig. 8 A and Fig. 8 B.The execution mode flow chart in order to simplify, becomes a node AGW with user's face nodal set among Fig. 9 as shown in Figure 9, but this embodiment still is suitable for when user plane unit is divided into different entities by logic function.Wherein:
Switching from Pre-LTE to LTE has following committed step, as shown in Figure 5:
Step 1, Pre-LTE send " re-positioning request " to SGSN;
Step 2, SGSN send " forwarding re-positioning request " message to MME;
Step 3, MME send out handoff request to AGW, set up the S1 user plane bearer between AGW and the LTE and are UE distribution radio channel, and AGW sends downlink data to SGSN and eNB simultaneously;
Step 5, Pre-LTE are transmitted to MME by SGSN with the SRNS context, and MME sends to AGW with it;
After setting up RB between step 6, UE and LTE, LTE notice MME switching is finished, and MME notice SGSN switching is finished, and discharges original resource.
The detailed step that present embodiment switches is seen Fig. 9, is example to switch to LTE from UTRAN, and it also is similar switching to LTE from the GERAN of Iu pattern.May further comprise the steps as shown in the figure:
901, UTRAN switches according to the detected signal strength signal intensity decision of UE needs;
902, UTRAN sends " re-positioning request " message to SGSN, comprises RRC context-sensitive information (comprising the MS ability) and other switching information needed in this request.These information will assist UE to switch to objective network fast;
903, SGSN sends " forwarding re-positioning request " message to UTRAN.The UTRAN that has in the message in the step 902 sends to the information of SGSN, the MM context among the SGSN, the PDP Context among the SGSN, wherein has IP address and the up GTP-U tunnel ID of GGSN in the PDP Context;
904, MME MM context switch that SGSN is sent becomes the MM context format of SAE, and will be mapped to the SAE beared information from the UMTS beared information that UTRAN sends, from the safe context of UE, derive required key, send " handoff request " message to AGW, have need in this message and set up the RB information of carrying, security related information etc.;
905, AGW sends to eNB that " request information is set up in carrying, setting up the S1 user plane bearer, and is UE distribution radio channel.AGW brings eNB with customer side encryption with key and algorithm;
906, eNB sends " response is set up in carrying " message to AGW, and eNB is also placed in the radio channel configuration information in the response message unit and brings AGW;
907, the data flow that needs are sent in order, AGW begins to eNB converting downlink packet, and at this moment, AGW sends downlink data to SGSN and eNB simultaneously;
908, AGW sends " switching request response " to MME, and the wireless channel configuration information that will " carry and set up response " in message in this message sends to MME;
909, MME sends " transmitting the re-positioning request response " to SGSN.The network that this message table makes eye bright is the access of UE all set, has described wireless channel configuration information in this message;
910, SGSN sends " transmitting the reorientation order " to UTRAN, has the described wireless channel configuration information of UE in this message;
911, after receiving " transmitting the reorientation order " message, UTRAN sends to UE with the wireless channel configuration information, to quicken the wave point time delay for switching, stop then and UE between transfer of data, and release interface-free resources (or when step 922, discharging again), UTRAN sends " transmitting the SRNS context " message to SGSN, has the togglebreakpoint information of each carrying in this message, i.e. the sequence number of the sequence number of next the up PDCP message that should receive and next GTP-U that should send;
912, SGSN sends " transmitting the SRNS context message " to MME, transmits the SRNS context in 911 message;
913, MME sends the SRNS context to AGW;
914, AGW sends " transmitting the SRNS context response " message to MME.
915, MME sends " transmitting the SRNS context response " message to SGSN;
916, UTRAN sends RRC message to UE, and notice UE carries out wireless channel and reshuffles, and has the channel information of eNB for its distribution in this message;
917, set up RB between UE and eNB;
918, UE sends RRC message to eNB, notifies the configuration of its wireless channel to finish;
919, eNB sends " routing update " message to AGW, and the data path between SGSN and AGW is switched between eNB and AGW;
920, AGW sends " routing update response " message to eNB, stops to SGSN converting downlink data flow;
921, eNB sends " switching is finished " and gives MME, and MME sends " transmitting reorientation finishes " message to SGSN;
922, SGSN sends " Iu release " and gives UTRAN;
923, UTRAN discharges the Iu interface resource, and sends " Iu discharges response " to SGSN;
924, SGSN sends " transmit reorientation and finish response " and gives MME, and " switching is finished response and given eNB, and switching is finished in the MME transmission;
925, carry out tracing section updating between UE and MME.
Step 905 in the above-mentioned flow process is that LTE is notice AGW to 908, by AGW notice eNB be the UE distributing radio resource and set up and eNB between carrying, but in another embodiment, also can be that directly to notify LTE be the UE distributing radio resource to MME.
As can be seen, the present invention has provided the method for switching between a kind of LTE of solution and Pre-LTE, and this method can accomplish to need not to upgrade existing SGSN, and switching point is placed on after the purpose Internet resources are ready to, thereby loss of data is dropped to minimum, and reduced handover delay.
Claims (14)
1, switch to the method for traditional wireless system Pre-LTE in a kind of mobile communication system from the wireless system LTE of evolution, may further comprise the steps:
(a) after the LTE decision is switched, send " handoff request " to mobile management node M ME, MME sends " forwarding re-positioning request " to the GPRS of objective network service node SGSN again;
(b) SGSN notice supports that the back is the mobile terminal UE distributing radio resource to the traditional wireless system PRE-LTE that switches, and sets up Iu according to RAB information with PRE-LTE and be connected, then to MME transmission " forwarding relocation response " message;
(c) MME sends " reorientation order " to access gateway AG W, if any the downstream data flow that need transmit according to the order of sequence, AGW stops to send this data flow to LTE, and beginning sends this data flow to SGSN, send the breakpoint information of this data flow simultaneously to MME, SGSN buffer memory downlink data;
(d) MME sends switching command to LTE, and described breakpoint information is sent to SGSN, and SGSN sends to PRE-LTE again, finishes SRNS context forwarding process;
(e) PRE-LTE and UE consult to set up radio bearer RB, and PRE-LTE sends " reorientation is finished " message to SGSN;
(f) carry out PDP Context between SGSN and the AGW and upgrade, set up user plane path, notify MME to be discharged into the user plane path of AGW and the Radio Resource of PRE-LTE simultaneously;
In the above step, MME also is used to finish the signaling format between the different agreement and the conversion of contextual information.
2, the method for claim 1 is characterized in that, described step (a) is further divided into:
(a1) after the LTE decision need be switched, send handoff request, comprise user profile, objective network information and RAB information in this request to MME;
(a2) MME finds corresponding SGSN according to described objective network information, with the MM context switch of system evolved framework SAE is the MM context of SGSN, comprise safe context, and be the RAB information that SGSN can discern with the RAB information translation that LTE sends, send " forwarding re-positioning request " message, the MM context and the described RAB information of carrying UE to SGSN.
3, the method for claim 1 is characterized in that, described step (b) is further divided into:
(b1) SGSN sends " re-positioning request " message, context safe to carry, UE user profile, RAB information to UTRAN;
(b2) UTRAN is connected according to setting up required Iu between RAB information and SGSN;
(b3) switching of Iu mouth is ready to complete, and UTRAN after UE distributes the radio channel resource, sends " re-positioning request is replied " message, the wireless resource configuration of carrying UE to SGSN;
(b4) SGSN sends " forwarding relocation response " message, the wireless resource configuration of carrying " data forwarding tunnel ID " and UE to MME.
4, the method for claim 1 is characterized in that, described step (c) is further divided into:
(c1) MME sends " reorientation order " message to AGW, and described " data forwarding tunnel ID " sent to AGW;
(c2) after AGW receives " reorientation order " message, data flow transmitted according to the order of sequence if needed, AGW stops to send downlink data to LTE, send " reorientation command response " message to MME, in this message, carry the breakpoint information of data flow transmitted according to the order of sequence: " next up PDCP sequence number to be confirmed " and " next up GTP sequence number ";
AGW begins to send the downstream data flow of transmission according to the order of sequence to SGSN simultaneously;
For not needing data flow transmitted according to the order of sequence, AGW can promptly send to LTE always in original path, after finishing the PDP Context renewal between AGW and the SGSN, switches on the new path again.
5, the method for claim 1 is characterized in that, described step (d) is further divided into:
(d1) MME sends " switching command " message to LTE, the wireless resource configuration of carrying UE, and LTE sends to UE with the wireless resource configuration of UE again;
(d2) MME sequence number that AGW is sent converts the SRNS context format to, and sends " transmitting the SRNS context " message to SGSN, has " SRNS context " in this message;
(d3) after SGSN receives " transmitting the SRNS context " message, send " transmitting the SRNS context " message, the SRNS context is sent to UTRAN to UTRAN;
(d4) after UTRAN receives " transmitting the SRNS context " message, preserve the SRNS contextual information, and send " transmitting the SRNS context response " message to SGSN;
(d5) SGSN sends " transmitting the SRNS context response " message to MME, and SRNS context forwarding process finishes.
6, method as claimed in claim 3 is characterized in that, described step (e) is further divided into:
(e1) UTRAN consults to set up radio bearer RB according to RAB information and UE in " re-positioning request " message in SRNS context in " transmitting the SRNS context " message and the step (b1), if any need data flow transmitted according to the order of sequence, UE and UTRAN exchange up-downgoing PDCP sequence number, both sides all can continue to send the up-downgoing packet from breakpoint;
(e2) UTRAN sends " reorientation is finished " message to SGSN, and data link successful switch arrives the new route through SGSN from UTRAN.
7, the method for claim 1 is characterized in that, described step (f) is further divided into:
(f1) SGSN sends " transmitting reorientation finishes " message to MME, and notice MME switching is finished, and the LTE/SAE resource can discharge;
(f2) SGSN sends " PDP Context renewal " message to AGW, sets up the user plane path from SGSN to AGW;
(f3) AGW sends " PDP Context upgrades response " to SGSN, and the user plane path from SGSN to AGW is set up and finished;
(f3) MME sends " release of S1 interface " message to LTE, and notice LTE discharges Radio Resource, and is discharged into the user plane path of AGW;
(f4) LTE discharges wireless mouthful of resource, discharges the S1 interface resource, sends " the S1 interface discharges response " message to MME;
(f5) MME sends " transmit reorientation and finish response " to SGSN.
8, switch to the method for the wireless system LTE of evolution in a kind of mobile communication system from traditional wireless system Pre-LTE, may further comprise the steps:
(A) after the Pre-LTE decision is switched, send " re-positioning request " to GPRS service node SGSN, SGSN sends " forwarding re-positioning request " message to mobile management node M ME;
(B) MME is by AGW notice LTE or directly to notify LTE be that UE distributes wireless channel, and the AGW notice is set up user plane path between LTE and AGW, and AGW begins to transmit to LTE needs the downlink data packet of transmission according to the order of sequence, sends downlink data to SGSN simultaneously;
(C) AGW sends " switching request response " to MME, carries the configuration information of wireless messages, is transmitted to mobile terminal UE by MME through SGSN, Pre-LTE, and Pre-LTE notice UE switches to new network, and announcement is the channel information of its distribution;
(D) Pre-LTE is transmitted to MME by SGSN with the SRNS context, and MME sends it to AGW again;
(E) after the configuration of the wireless channel between UE and the LTE was finished, LTE notice AGW switched to the data channel between AGW and SGSN between AGW and LTE, and AGW stops to send downlink data to SGSN;
(F) LTE notice MME switching is finished, and MME reinforms the lu interface resource between SGSN release and Pre-LTE, and switching is finished;
In the above step, MME also is used to finish the signaling format between the different agreement and the conversion of contextual information.
9, method as claimed in claim 8 is characterized in that, described step (A) is further divided into:
(A1) after the Pre-LTE decision need be switched, send " re-positioning request " message, comprise the information that RRC context-sensitive information and other assistance UE switch to objective network fast in this request to SGSN;
(A2) SGSN sends " forwarding re-positioning request " message to PRE-LTE, carry the information of SGSN that sends in the step (A1), the MM context among the SGSN, the PDP Context among the SGSN, wherein have IP address and the up GTP-U tunnel ID of GGSN in the PDP Context.
10, method as claimed in claim 8 is characterized in that, described step (B) is further divided into:
(B1) MME MM context switch that SGSN is sent becomes the MM context format of SAE, and will be mapped to the SAE beared information from the UMTS beared information that PRE-LTE sends, from the safe context of UE, derive required key, send " handoff request " message to AGW, carry the RB information and the security related information that need to set up carrying;
(B2) AGW sends to LTE that " request information is set up in carrying, setting up the S1 user plane bearer, and is UE distribution radio channel, and AGW brings LTE with customer side encryption with key and algorithm;
(B3) LTE sends " response is set up in carrying " message to AGW, carries the radio channel configuration information of UE;
(B4) data flow that needs are sent in order, AGW begins to LTE converting downlink data flow, sends downstream data flow to SGSN simultaneously.
11, method as claimed in claim 8 is characterized in that, described step (C) is further divided into:
(C1) AGW sends " switching request response " to MME, and the wireless channel configuration information that will " carry and set up response " in message in this message sends to MME;
(C2) MME sends " transmitting the re-positioning request response " to SGSN, and the network that this message table makes eye bright is the access of UE all set, has described wireless channel configuration information in this message;
(C3) SGSN sends " transmitting the reorientation order " to PRE-LTE, has the described wireless channel configuration information of UE in this message;
(C4) after receiving " transmit reorientation order " message, PRE-LTE sends to UE with the wireless channel configuration information, stop then and UE between transfer of data.
12, method as claimed in claim 8 is characterized in that, described step (D) is further divided into:
(D1) PRE-LTE sends " transmitting the SRNS context " message to SGSN, has the togglebreakpoint information of each carrying in this message, i.e. the sequence number of the sequence number of next the up PDCP message that should receive and next GTP-U that should send;
(D2) SGSN sends " transmitting the SRNS context message " to MME, transmits the SRNS context in 911 message;
(D3) MME sends the SRNS context to AGW;
(D4) AGW sends " transmitting the SRNS context response " message to MME;
(D5) MME sends " transmitting the SRNS context response " message to SGSN.
13, method as claimed in claim 8 is characterized in that, described step (E) is further divided into:
(E1) PRE-LTE sends RRC message to UE, and notice UE carries out wireless channel and reshuffles, and has the channel information of LTE for its distribution in this message;
(E2) set up RB between UE and LTE;
(E3) UE sends RRC message to LTE, notifies the configuration of its wireless channel to finish;
(E4) LTE sends " routing update " message to AGW, and the data path between SGSN and AGW is switched between LTE and AGW;
(E5) AGW sends " routing update response " message to LTE, stops to transmit data flow to SGSN.
14, method as claimed in claim 8 is characterized in that, described step (F) is further divided into:
(F1) LTE sends " switching is finished " and gives MME, and MME sends " transmitting reorientation finishes " message to SGSN;
(F2) SGSN sends " Iu release " and gives PRE-LTE;
(F3) PRE-LTE discharges the Iu interface resource, and sends " Iu discharges response " to SGSN;
(F4) SGSN sends " transmit reorientation and finish response " and gives MME, and " switching is finished response and given LTE, and switching is finished in the MME transmission.
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